1 /*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #include <linux/mm.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/ratelimit.h>
43 #include <linux/printk.h>
44 #include <linux/slab.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfs.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/nfs_page.h>
50 #include <linux/nfs_mount.h>
51 #include <linux/namei.h>
52 #include <linux/mount.h>
53 #include <linux/module.h>
54 #include <linux/xattr.h>
55 #include <linux/utsname.h>
56 #include <linux/freezer.h>
57 #include <linux/iversion.h>
58
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "sysfs.h"
67 #include "nfs4idmap.h"
68 #include "nfs4session.h"
69 #include "fscache.h"
70 #include "nfs42.h"
71
72 #include "nfs4trace.h"
73
74 #define NFSDBG_FACILITY NFSDBG_PROC
75
76 #define NFS4_BITMASK_SZ 3
77
78 #define NFS4_POLL_RETRY_MIN (HZ/10)
79 #define NFS4_POLL_RETRY_MAX (15*HZ)
80
81 /* file attributes which can be mapped to nfs attributes */
82 #define NFS4_VALID_ATTRS (ATTR_MODE \
83 | ATTR_UID \
84 | ATTR_GID \
85 | ATTR_SIZE \
86 | ATTR_ATIME \
87 | ATTR_MTIME \
88 | ATTR_CTIME \
89 | ATTR_ATIME_SET \
90 | ATTR_MTIME_SET)
91
92 struct nfs4_opendata;
93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
97 struct nfs_fattr *fattr, struct inode *inode);
98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
99 struct nfs_fattr *fattr, struct iattr *sattr,
100 struct nfs_open_context *ctx, struct nfs4_label *ilabel);
101 #ifdef CONFIG_NFS_V4_1
102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
103 const struct cred *cred,
104 struct nfs4_slot *slot,
105 bool is_privileged);
106 static int nfs41_test_stateid(struct nfs_server *, const nfs4_stateid *,
107 const struct cred *);
108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
109 const struct cred *, bool);
110 #endif
111
112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
113 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
115 struct iattr *sattr, struct nfs4_label *label)
116 {
117 int err;
118
119 if (label == NULL)
120 return NULL;
121
122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
123 return NULL;
124
125 label->lfs = 0;
126 label->pi = 0;
127 label->len = 0;
128 label->label = NULL;
129
130 err = security_dentry_init_security(dentry, sattr->ia_mode,
131 &dentry->d_name, NULL,
132 (void **)&label->label, &label->len);
133 if (err == 0)
134 return label;
135
136 return NULL;
137 }
138 static inline void
nfs4_label_release_security(struct nfs4_label * label)139 nfs4_label_release_security(struct nfs4_label *label)
140 {
141 if (label)
142 security_release_secctx(label->label, label->len);
143 }
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
145 {
146 if (label)
147 return server->attr_bitmask;
148
149 return server->attr_bitmask_nl;
150 }
151 #else
152 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * l)153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
154 struct iattr *sattr, struct nfs4_label *l)
155 { return NULL; }
156 static inline void
nfs4_label_release_security(struct nfs4_label * label)157 nfs4_label_release_security(struct nfs4_label *label)
158 { return; }
159 static inline u32 *
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
161 { return server->attr_bitmask; }
162 #endif
163
164 /* Prevent leaks of NFSv4 errors into userland */
nfs4_map_errors(int err)165 static int nfs4_map_errors(int err)
166 {
167 if (err >= -1000)
168 return err;
169 switch (err) {
170 case -NFS4ERR_RESOURCE:
171 case -NFS4ERR_LAYOUTTRYLATER:
172 case -NFS4ERR_RECALLCONFLICT:
173 case -NFS4ERR_RETURNCONFLICT:
174 return -EREMOTEIO;
175 case -NFS4ERR_WRONGSEC:
176 case -NFS4ERR_WRONG_CRED:
177 return -EPERM;
178 case -NFS4ERR_BADOWNER:
179 case -NFS4ERR_BADNAME:
180 return -EINVAL;
181 case -NFS4ERR_SHARE_DENIED:
182 return -EACCES;
183 case -NFS4ERR_MINOR_VERS_MISMATCH:
184 return -EPROTONOSUPPORT;
185 case -NFS4ERR_FILE_OPEN:
186 return -EBUSY;
187 case -NFS4ERR_NOT_SAME:
188 return -ENOTSYNC;
189 default:
190 dprintk("%s could not handle NFSv4 error %d\n",
191 __func__, -err);
192 break;
193 }
194 return -EIO;
195 }
196
197 /*
198 * This is our standard bitmap for GETATTR requests.
199 */
200 const u32 nfs4_fattr_bitmap[3] = {
201 FATTR4_WORD0_TYPE
202 | FATTR4_WORD0_CHANGE
203 | FATTR4_WORD0_SIZE
204 | FATTR4_WORD0_FSID
205 | FATTR4_WORD0_FILEID,
206 FATTR4_WORD1_MODE
207 | FATTR4_WORD1_NUMLINKS
208 | FATTR4_WORD1_OWNER
209 | FATTR4_WORD1_OWNER_GROUP
210 | FATTR4_WORD1_RAWDEV
211 | FATTR4_WORD1_SPACE_USED
212 | FATTR4_WORD1_TIME_ACCESS
213 | FATTR4_WORD1_TIME_METADATA
214 | FATTR4_WORD1_TIME_MODIFY
215 | FATTR4_WORD1_MOUNTED_ON_FILEID,
216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
217 FATTR4_WORD2_SECURITY_LABEL
218 #endif
219 };
220
221 static const u32 nfs4_pnfs_open_bitmap[3] = {
222 FATTR4_WORD0_TYPE
223 | FATTR4_WORD0_CHANGE
224 | FATTR4_WORD0_SIZE
225 | FATTR4_WORD0_FSID
226 | FATTR4_WORD0_FILEID,
227 FATTR4_WORD1_MODE
228 | FATTR4_WORD1_NUMLINKS
229 | FATTR4_WORD1_OWNER
230 | FATTR4_WORD1_OWNER_GROUP
231 | FATTR4_WORD1_RAWDEV
232 | FATTR4_WORD1_SPACE_USED
233 | FATTR4_WORD1_TIME_ACCESS
234 | FATTR4_WORD1_TIME_METADATA
235 | FATTR4_WORD1_TIME_MODIFY,
236 FATTR4_WORD2_MDSTHRESHOLD
237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
238 | FATTR4_WORD2_SECURITY_LABEL
239 #endif
240 };
241
242 static const u32 nfs4_open_noattr_bitmap[3] = {
243 FATTR4_WORD0_TYPE
244 | FATTR4_WORD0_FILEID,
245 };
246
247 const u32 nfs4_statfs_bitmap[3] = {
248 FATTR4_WORD0_FILES_AVAIL
249 | FATTR4_WORD0_FILES_FREE
250 | FATTR4_WORD0_FILES_TOTAL,
251 FATTR4_WORD1_SPACE_AVAIL
252 | FATTR4_WORD1_SPACE_FREE
253 | FATTR4_WORD1_SPACE_TOTAL
254 };
255
256 const u32 nfs4_pathconf_bitmap[3] = {
257 FATTR4_WORD0_MAXLINK
258 | FATTR4_WORD0_MAXNAME,
259 0
260 };
261
262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
263 | FATTR4_WORD0_MAXREAD
264 | FATTR4_WORD0_MAXWRITE
265 | FATTR4_WORD0_LEASE_TIME,
266 FATTR4_WORD1_TIME_DELTA
267 | FATTR4_WORD1_FS_LAYOUT_TYPES,
268 FATTR4_WORD2_LAYOUT_BLKSIZE
269 | FATTR4_WORD2_CLONE_BLKSIZE
270 | FATTR4_WORD2_CHANGE_ATTR_TYPE
271 | FATTR4_WORD2_XATTR_SUPPORT
272 };
273
274 const u32 nfs4_fs_locations_bitmap[3] = {
275 FATTR4_WORD0_CHANGE
276 | FATTR4_WORD0_SIZE
277 | FATTR4_WORD0_FSID
278 | FATTR4_WORD0_FILEID
279 | FATTR4_WORD0_FS_LOCATIONS,
280 FATTR4_WORD1_OWNER
281 | FATTR4_WORD1_OWNER_GROUP
282 | FATTR4_WORD1_RAWDEV
283 | FATTR4_WORD1_SPACE_USED
284 | FATTR4_WORD1_TIME_ACCESS
285 | FATTR4_WORD1_TIME_METADATA
286 | FATTR4_WORD1_TIME_MODIFY
287 | FATTR4_WORD1_MOUNTED_ON_FILEID,
288 };
289
nfs4_bitmap_copy_adjust(__u32 * dst,const __u32 * src,struct inode * inode,unsigned long flags)290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
291 struct inode *inode, unsigned long flags)
292 {
293 unsigned long cache_validity;
294
295 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
296 if (!inode || !nfs_have_read_or_write_delegation(inode))
297 return;
298
299 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
300
301 /* Remove the attributes over which we have full control */
302 dst[1] &= ~FATTR4_WORD1_RAWDEV;
303 if (!(cache_validity & NFS_INO_INVALID_SIZE))
304 dst[0] &= ~FATTR4_WORD0_SIZE;
305
306 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
307 dst[0] &= ~FATTR4_WORD0_CHANGE;
308
309 if (!(cache_validity & NFS_INO_INVALID_MODE))
310 dst[1] &= ~FATTR4_WORD1_MODE;
311 if (!(cache_validity & NFS_INO_INVALID_OTHER))
312 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
313
314 if (nfs_have_delegated_mtime(inode)) {
315 if (!(cache_validity & NFS_INO_INVALID_ATIME))
316 dst[1] &= ~FATTR4_WORD1_TIME_ACCESS;
317 if (!(cache_validity & NFS_INO_INVALID_MTIME))
318 dst[1] &= ~FATTR4_WORD1_TIME_MODIFY;
319 if (!(cache_validity & NFS_INO_INVALID_CTIME))
320 dst[1] &= ~FATTR4_WORD1_TIME_METADATA;
321 } else if (nfs_have_delegated_atime(inode)) {
322 if (!(cache_validity & NFS_INO_INVALID_ATIME))
323 dst[1] &= ~FATTR4_WORD1_TIME_ACCESS;
324 }
325 }
326
nfs4_setup_readdir(u64 cookie,__be32 * verifier,struct dentry * dentry,struct nfs4_readdir_arg * readdir)327 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
328 struct nfs4_readdir_arg *readdir)
329 {
330 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
331 __be32 *start, *p;
332
333 if (cookie > 2) {
334 readdir->cookie = cookie;
335 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
336 return;
337 }
338
339 readdir->cookie = 0;
340 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
341 if (cookie == 2)
342 return;
343
344 /*
345 * NFSv4 servers do not return entries for '.' and '..'
346 * Therefore, we fake these entries here. We let '.'
347 * have cookie 0 and '..' have cookie 1. Note that
348 * when talking to the server, we always send cookie 0
349 * instead of 1 or 2.
350 */
351 start = p = kmap_atomic(*readdir->pages);
352
353 if (cookie == 0) {
354 *p++ = xdr_one; /* next */
355 *p++ = xdr_zero; /* cookie, first word */
356 *p++ = xdr_one; /* cookie, second word */
357 *p++ = xdr_one; /* entry len */
358 memcpy(p, ".\0\0\0", 4); /* entry */
359 p++;
360 *p++ = xdr_one; /* bitmap length */
361 *p++ = htonl(attrs); /* bitmap */
362 *p++ = htonl(12); /* attribute buffer length */
363 *p++ = htonl(NF4DIR);
364 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
365 }
366
367 *p++ = xdr_one; /* next */
368 *p++ = xdr_zero; /* cookie, first word */
369 *p++ = xdr_two; /* cookie, second word */
370 *p++ = xdr_two; /* entry len */
371 memcpy(p, "..\0\0", 4); /* entry */
372 p++;
373 *p++ = xdr_one; /* bitmap length */
374 *p++ = htonl(attrs); /* bitmap */
375 *p++ = htonl(12); /* attribute buffer length */
376 *p++ = htonl(NF4DIR);
377 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
378
379 readdir->pgbase = (char *)p - (char *)start;
380 readdir->count -= readdir->pgbase;
381 kunmap_atomic(start);
382 }
383
nfs4_fattr_set_prechange(struct nfs_fattr * fattr,u64 version)384 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
385 {
386 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
387 fattr->pre_change_attr = version;
388 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
389 }
390 }
391
nfs4_test_and_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)392 static void nfs4_test_and_free_stateid(struct nfs_server *server,
393 nfs4_stateid *stateid,
394 const struct cred *cred)
395 {
396 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
397
398 ops->test_and_free_expired(server, stateid, cred);
399 }
400
__nfs4_free_revoked_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)401 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
402 nfs4_stateid *stateid,
403 const struct cred *cred)
404 {
405 stateid->type = NFS4_REVOKED_STATEID_TYPE;
406 nfs4_test_and_free_stateid(server, stateid, cred);
407 }
408
nfs4_free_revoked_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)409 static void nfs4_free_revoked_stateid(struct nfs_server *server,
410 const nfs4_stateid *stateid,
411 const struct cred *cred)
412 {
413 nfs4_stateid tmp;
414
415 nfs4_stateid_copy(&tmp, stateid);
416 __nfs4_free_revoked_stateid(server, &tmp, cred);
417 }
418
nfs4_update_delay(long * timeout)419 static long nfs4_update_delay(long *timeout)
420 {
421 long ret;
422 if (!timeout)
423 return NFS4_POLL_RETRY_MAX;
424 if (*timeout <= 0)
425 *timeout = NFS4_POLL_RETRY_MIN;
426 if (*timeout > NFS4_POLL_RETRY_MAX)
427 *timeout = NFS4_POLL_RETRY_MAX;
428 ret = *timeout;
429 *timeout <<= 1;
430 return ret;
431 }
432
nfs4_delay_killable(long * timeout)433 static int nfs4_delay_killable(long *timeout)
434 {
435 might_sleep();
436
437 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
438 schedule_timeout(nfs4_update_delay(timeout));
439 if (!__fatal_signal_pending(current))
440 return 0;
441 return -EINTR;
442 }
443
nfs4_delay_interruptible(long * timeout)444 static int nfs4_delay_interruptible(long *timeout)
445 {
446 might_sleep();
447
448 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
449 schedule_timeout(nfs4_update_delay(timeout));
450 if (!signal_pending(current))
451 return 0;
452 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
453 }
454
nfs4_delay(long * timeout,bool interruptible)455 static int nfs4_delay(long *timeout, bool interruptible)
456 {
457 if (interruptible)
458 return nfs4_delay_interruptible(timeout);
459 return nfs4_delay_killable(timeout);
460 }
461
462 static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid * stateid)463 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
464 {
465 if (!stateid)
466 return NULL;
467 switch (stateid->type) {
468 case NFS4_OPEN_STATEID_TYPE:
469 case NFS4_LOCK_STATEID_TYPE:
470 case NFS4_DELEGATION_STATEID_TYPE:
471 return stateid;
472 default:
473 break;
474 }
475 return NULL;
476 }
477
478 /* This is the error handling routine for processes that are allowed
479 * to sleep.
480 */
nfs4_do_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)481 static int nfs4_do_handle_exception(struct nfs_server *server,
482 int errorcode, struct nfs4_exception *exception)
483 {
484 struct nfs_client *clp = server->nfs_client;
485 struct nfs4_state *state = exception->state;
486 const nfs4_stateid *stateid;
487 struct inode *inode = exception->inode;
488 int ret = errorcode;
489
490 exception->delay = 0;
491 exception->recovering = 0;
492 exception->retry = 0;
493
494 stateid = nfs4_recoverable_stateid(exception->stateid);
495 if (stateid == NULL && state != NULL)
496 stateid = nfs4_recoverable_stateid(&state->stateid);
497
498 switch(errorcode) {
499 case 0:
500 return 0;
501 case -NFS4ERR_BADHANDLE:
502 case -ESTALE:
503 if (inode != NULL && S_ISREG(inode->i_mode))
504 pnfs_destroy_layout(NFS_I(inode));
505 break;
506 case -NFS4ERR_DELEG_REVOKED:
507 case -NFS4ERR_ADMIN_REVOKED:
508 case -NFS4ERR_EXPIRED:
509 case -NFS4ERR_BAD_STATEID:
510 case -NFS4ERR_PARTNER_NO_AUTH:
511 if (inode != NULL && stateid != NULL) {
512 nfs_inode_find_state_and_recover(inode,
513 stateid);
514 goto wait_on_recovery;
515 }
516 fallthrough;
517 case -NFS4ERR_OPENMODE:
518 if (inode) {
519 int err;
520
521 err = nfs_async_inode_return_delegation(inode,
522 stateid);
523 if (err == 0)
524 goto wait_on_recovery;
525 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
526 exception->retry = 1;
527 break;
528 }
529 }
530 if (state == NULL)
531 break;
532 ret = nfs4_schedule_stateid_recovery(server, state);
533 if (ret < 0)
534 break;
535 goto wait_on_recovery;
536 case -NFS4ERR_STALE_STATEID:
537 case -NFS4ERR_STALE_CLIENTID:
538 nfs4_schedule_lease_recovery(clp);
539 goto wait_on_recovery;
540 case -NFS4ERR_MOVED:
541 ret = nfs4_schedule_migration_recovery(server);
542 if (ret < 0)
543 break;
544 goto wait_on_recovery;
545 case -NFS4ERR_LEASE_MOVED:
546 nfs4_schedule_lease_moved_recovery(clp);
547 goto wait_on_recovery;
548 #if defined(CONFIG_NFS_V4_1)
549 case -NFS4ERR_BADSESSION:
550 case -NFS4ERR_BADSLOT:
551 case -NFS4ERR_BAD_HIGH_SLOT:
552 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
553 case -NFS4ERR_DEADSESSION:
554 case -NFS4ERR_SEQ_FALSE_RETRY:
555 case -NFS4ERR_SEQ_MISORDERED:
556 /* Handled in nfs41_sequence_process() */
557 goto wait_on_recovery;
558 #endif /* defined(CONFIG_NFS_V4_1) */
559 case -NFS4ERR_FILE_OPEN:
560 if (exception->timeout > HZ) {
561 /* We have retried a decent amount, time to
562 * fail
563 */
564 ret = -EBUSY;
565 break;
566 }
567 fallthrough;
568 case -NFS4ERR_DELAY:
569 nfs_inc_server_stats(server, NFSIOS_DELAY);
570 fallthrough;
571 case -NFS4ERR_GRACE:
572 case -NFS4ERR_LAYOUTTRYLATER:
573 case -NFS4ERR_RECALLCONFLICT:
574 case -NFS4ERR_RETURNCONFLICT:
575 exception->delay = 1;
576 return 0;
577
578 case -NFS4ERR_RETRY_UNCACHED_REP:
579 case -NFS4ERR_OLD_STATEID:
580 exception->retry = 1;
581 break;
582 case -NFS4ERR_BADOWNER:
583 /* The following works around a Linux server bug! */
584 case -NFS4ERR_BADNAME:
585 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
586 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
587 exception->retry = 1;
588 printk(KERN_WARNING "NFS: v4 server %s "
589 "does not accept raw "
590 "uid/gids. "
591 "Reenabling the idmapper.\n",
592 server->nfs_client->cl_hostname);
593 }
594 }
595 /* We failed to handle the error */
596 return nfs4_map_errors(ret);
597 wait_on_recovery:
598 exception->recovering = 1;
599 return 0;
600 }
601
602 /*
603 * Track the number of NFS4ERR_DELAY related retransmissions and return
604 * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
605 * set by 'nfs_delay_retrans'.
606 */
nfs4_exception_should_retrans(const struct nfs_server * server,struct nfs4_exception * exception)607 static int nfs4_exception_should_retrans(const struct nfs_server *server,
608 struct nfs4_exception *exception)
609 {
610 if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
611 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
612 return -EAGAIN;
613 }
614 return 0;
615 }
616
617 /* This is the error handling routine for processes that are allowed
618 * to sleep.
619 */
nfs4_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)620 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
621 {
622 struct nfs_client *clp = server->nfs_client;
623 int ret;
624
625 ret = nfs4_do_handle_exception(server, errorcode, exception);
626 if (exception->delay) {
627 int ret2 = nfs4_exception_should_retrans(server, exception);
628 if (ret2 < 0) {
629 exception->retry = 0;
630 return ret2;
631 }
632 ret = nfs4_delay(&exception->timeout,
633 exception->interruptible);
634 goto out_retry;
635 }
636 if (exception->recovering) {
637 if (exception->task_is_privileged)
638 return -EDEADLOCK;
639 ret = nfs4_wait_clnt_recover(clp);
640 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
641 return -EIO;
642 goto out_retry;
643 }
644 return ret;
645 out_retry:
646 if (ret == 0)
647 exception->retry = 1;
648 return ret;
649 }
650
651 static int
nfs4_async_handle_exception(struct rpc_task * task,struct nfs_server * server,int errorcode,struct nfs4_exception * exception)652 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
653 int errorcode, struct nfs4_exception *exception)
654 {
655 struct nfs_client *clp = server->nfs_client;
656 int ret;
657
658 ret = nfs4_do_handle_exception(server, errorcode, exception);
659 if (exception->delay) {
660 int ret2 = nfs4_exception_should_retrans(server, exception);
661 if (ret2 < 0) {
662 exception->retry = 0;
663 return ret2;
664 }
665 rpc_delay(task, nfs4_update_delay(&exception->timeout));
666 goto out_retry;
667 }
668 if (exception->recovering) {
669 if (exception->task_is_privileged)
670 return -EDEADLOCK;
671 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
672 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
673 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
674 goto out_retry;
675 }
676 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
677 ret = -EIO;
678 return ret;
679 out_retry:
680 if (ret == 0) {
681 exception->retry = 1;
682 /*
683 * For NFS4ERR_MOVED, the client transport will need to
684 * be recomputed after migration recovery has completed.
685 */
686 if (errorcode == -NFS4ERR_MOVED)
687 rpc_task_release_transport(task);
688 }
689 return ret;
690 }
691
692 int
nfs4_async_handle_error(struct rpc_task * task,struct nfs_server * server,struct nfs4_state * state,long * timeout)693 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
694 struct nfs4_state *state, long *timeout)
695 {
696 struct nfs4_exception exception = {
697 .state = state,
698 };
699
700 if (task->tk_status >= 0)
701 return 0;
702 if (timeout)
703 exception.timeout = *timeout;
704 task->tk_status = nfs4_async_handle_exception(task, server,
705 task->tk_status,
706 &exception);
707 if (exception.delay && timeout)
708 *timeout = exception.timeout;
709 if (exception.retry)
710 return -EAGAIN;
711 return 0;
712 }
713
714 /*
715 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
716 * or 'false' otherwise.
717 */
_nfs4_is_integrity_protected(struct nfs_client * clp)718 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
719 {
720 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
721 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
722 }
723
do_renew_lease(struct nfs_client * clp,unsigned long timestamp)724 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
725 {
726 spin_lock(&clp->cl_lock);
727 if (time_before(clp->cl_last_renewal,timestamp))
728 clp->cl_last_renewal = timestamp;
729 spin_unlock(&clp->cl_lock);
730 }
731
renew_lease(const struct nfs_server * server,unsigned long timestamp)732 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
733 {
734 struct nfs_client *clp = server->nfs_client;
735
736 if (!nfs4_has_session(clp))
737 do_renew_lease(clp, timestamp);
738 }
739
740 struct nfs4_call_sync_data {
741 const struct nfs_server *seq_server;
742 struct nfs4_sequence_args *seq_args;
743 struct nfs4_sequence_res *seq_res;
744 };
745
nfs4_init_sequence(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply,int privileged)746 void nfs4_init_sequence(struct nfs4_sequence_args *args,
747 struct nfs4_sequence_res *res, int cache_reply,
748 int privileged)
749 {
750 args->sa_slot = NULL;
751 args->sa_cache_this = cache_reply;
752 args->sa_privileged = privileged;
753
754 res->sr_slot = NULL;
755 }
756
nfs40_sequence_free_slot(struct nfs4_sequence_res * res)757 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
758 {
759 struct nfs4_slot *slot = res->sr_slot;
760 struct nfs4_slot_table *tbl;
761
762 tbl = slot->table;
763 spin_lock(&tbl->slot_tbl_lock);
764 if (!nfs41_wake_and_assign_slot(tbl, slot))
765 nfs4_free_slot(tbl, slot);
766 spin_unlock(&tbl->slot_tbl_lock);
767
768 res->sr_slot = NULL;
769 }
770
nfs40_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)771 static int nfs40_sequence_done(struct rpc_task *task,
772 struct nfs4_sequence_res *res)
773 {
774 if (res->sr_slot != NULL)
775 nfs40_sequence_free_slot(res);
776 return 1;
777 }
778
779 #if defined(CONFIG_NFS_V4_1)
780
nfs41_release_slot(struct nfs4_slot * slot)781 static void nfs41_release_slot(struct nfs4_slot *slot)
782 {
783 struct nfs4_session *session;
784 struct nfs4_slot_table *tbl;
785 bool send_new_highest_used_slotid = false;
786
787 if (!slot)
788 return;
789 tbl = slot->table;
790 session = tbl->session;
791
792 /* Bump the slot sequence number */
793 if (slot->seq_done)
794 slot->seq_nr++;
795 slot->seq_done = 0;
796
797 spin_lock(&tbl->slot_tbl_lock);
798 /* Be nice to the server: try to ensure that the last transmitted
799 * value for highest_user_slotid <= target_highest_slotid
800 */
801 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
802 send_new_highest_used_slotid = true;
803
804 if (nfs41_wake_and_assign_slot(tbl, slot)) {
805 send_new_highest_used_slotid = false;
806 goto out_unlock;
807 }
808 nfs4_free_slot(tbl, slot);
809
810 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
811 send_new_highest_used_slotid = false;
812 out_unlock:
813 spin_unlock(&tbl->slot_tbl_lock);
814 if (send_new_highest_used_slotid)
815 nfs41_notify_server(session->clp);
816 if (waitqueue_active(&tbl->slot_waitq))
817 wake_up_all(&tbl->slot_waitq);
818 }
819
nfs41_sequence_free_slot(struct nfs4_sequence_res * res)820 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
821 {
822 nfs41_release_slot(res->sr_slot);
823 res->sr_slot = NULL;
824 }
825
nfs4_slot_sequence_record_sent(struct nfs4_slot * slot,u32 seqnr)826 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
827 u32 seqnr)
828 {
829 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
830 slot->seq_nr_highest_sent = seqnr;
831 }
nfs4_slot_sequence_acked(struct nfs4_slot * slot,u32 seqnr)832 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
833 {
834 nfs4_slot_sequence_record_sent(slot, seqnr);
835 slot->seq_nr_last_acked = seqnr;
836 }
837
nfs4_probe_sequence(struct nfs_client * client,const struct cred * cred,struct nfs4_slot * slot)838 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
839 struct nfs4_slot *slot)
840 {
841 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
842 if (!IS_ERR(task))
843 rpc_put_task_async(task);
844 }
845
nfs41_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)846 static int nfs41_sequence_process(struct rpc_task *task,
847 struct nfs4_sequence_res *res)
848 {
849 struct nfs4_session *session;
850 struct nfs4_slot *slot = res->sr_slot;
851 struct nfs_client *clp;
852 int status;
853 int ret = 1;
854
855 if (slot == NULL)
856 goto out_noaction;
857 /* don't increment the sequence number if the task wasn't sent */
858 if (!RPC_WAS_SENT(task) || slot->seq_done)
859 goto out;
860
861 session = slot->table->session;
862 clp = session->clp;
863
864 trace_nfs4_sequence_done(session, res);
865
866 status = res->sr_status;
867 if (task->tk_status == -NFS4ERR_DEADSESSION)
868 status = -NFS4ERR_DEADSESSION;
869
870 /* Check the SEQUENCE operation status */
871 switch (status) {
872 case 0:
873 /* Mark this sequence number as having been acked */
874 nfs4_slot_sequence_acked(slot, slot->seq_nr);
875 /* Update the slot's sequence and clientid lease timer */
876 slot->seq_done = 1;
877 do_renew_lease(clp, res->sr_timestamp);
878 /* Check sequence flags */
879 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
880 !!slot->privileged);
881 nfs41_update_target_slotid(slot->table, slot, res);
882 break;
883 case 1:
884 /*
885 * sr_status remains 1 if an RPC level error occurred.
886 * The server may or may not have processed the sequence
887 * operation..
888 */
889 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
890 slot->seq_done = 1;
891 goto out;
892 case -NFS4ERR_DELAY:
893 /* The server detected a resend of the RPC call and
894 * returned NFS4ERR_DELAY as per Section 2.10.6.2
895 * of RFC5661.
896 */
897 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
898 __func__,
899 slot->slot_nr,
900 slot->seq_nr);
901 goto out_retry;
902 case -NFS4ERR_RETRY_UNCACHED_REP:
903 case -NFS4ERR_SEQ_FALSE_RETRY:
904 /*
905 * The server thinks we tried to replay a request.
906 * Retry the call after bumping the sequence ID.
907 */
908 nfs4_slot_sequence_acked(slot, slot->seq_nr);
909 goto retry_new_seq;
910 case -NFS4ERR_BADSLOT:
911 /*
912 * The slot id we used was probably retired. Try again
913 * using a different slot id.
914 */
915 if (slot->slot_nr < slot->table->target_highest_slotid)
916 goto session_recover;
917 goto retry_nowait;
918 case -NFS4ERR_SEQ_MISORDERED:
919 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
920 /*
921 * Were one or more calls using this slot interrupted?
922 * If the server never received the request, then our
923 * transmitted slot sequence number may be too high. However,
924 * if the server did receive the request then it might
925 * accidentally give us a reply with a mismatched operation.
926 * We can sort this out by sending a lone sequence operation
927 * to the server on the same slot.
928 */
929 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
930 slot->seq_nr--;
931 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
932 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
933 res->sr_slot = NULL;
934 }
935 goto retry_nowait;
936 }
937 /*
938 * RFC5661:
939 * A retry might be sent while the original request is
940 * still in progress on the replier. The replier SHOULD
941 * deal with the issue by returning NFS4ERR_DELAY as the
942 * reply to SEQUENCE or CB_SEQUENCE operation, but
943 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
944 *
945 * Restart the search after a delay.
946 */
947 slot->seq_nr = slot->seq_nr_highest_sent;
948 goto out_retry;
949 case -NFS4ERR_BADSESSION:
950 case -NFS4ERR_DEADSESSION:
951 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
952 goto session_recover;
953 default:
954 /* Just update the slot sequence no. */
955 slot->seq_done = 1;
956 }
957 out:
958 /* The session may be reset by one of the error handlers. */
959 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
960 out_noaction:
961 return ret;
962 session_recover:
963 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
964 nfs4_schedule_session_recovery(session, status);
965 dprintk("%s ERROR: %d Reset session\n", __func__, status);
966 nfs41_sequence_free_slot(res);
967 goto out;
968 retry_new_seq:
969 ++slot->seq_nr;
970 retry_nowait:
971 if (rpc_restart_call_prepare(task)) {
972 nfs41_sequence_free_slot(res);
973 task->tk_status = 0;
974 ret = 0;
975 }
976 goto out;
977 out_retry:
978 if (!rpc_restart_call(task))
979 goto out;
980 rpc_delay(task, NFS4_POLL_RETRY_MAX);
981 return 0;
982 }
983
nfs41_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)984 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
985 {
986 if (!nfs41_sequence_process(task, res))
987 return 0;
988 if (res->sr_slot != NULL)
989 nfs41_sequence_free_slot(res);
990 return 1;
991
992 }
993 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
994
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)995 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
996 {
997 if (res->sr_slot == NULL)
998 return 1;
999 if (res->sr_slot->table->session != NULL)
1000 return nfs41_sequence_process(task, res);
1001 return nfs40_sequence_done(task, res);
1002 }
1003
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1004 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1005 {
1006 if (res->sr_slot != NULL) {
1007 if (res->sr_slot->table->session != NULL)
1008 nfs41_sequence_free_slot(res);
1009 else
1010 nfs40_sequence_free_slot(res);
1011 }
1012 }
1013
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1014 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1015 {
1016 if (res->sr_slot == NULL)
1017 return 1;
1018 if (!res->sr_slot->table->session)
1019 return nfs40_sequence_done(task, res);
1020 return nfs41_sequence_done(task, res);
1021 }
1022 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1023
nfs41_call_sync_prepare(struct rpc_task * task,void * calldata)1024 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
1025 {
1026 struct nfs4_call_sync_data *data = calldata;
1027
1028 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1029
1030 nfs4_setup_sequence(data->seq_server->nfs_client,
1031 data->seq_args, data->seq_res, task);
1032 }
1033
nfs41_call_sync_done(struct rpc_task * task,void * calldata)1034 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1035 {
1036 struct nfs4_call_sync_data *data = calldata;
1037
1038 nfs41_sequence_done(task, data->seq_res);
1039 }
1040
1041 static const struct rpc_call_ops nfs41_call_sync_ops = {
1042 .rpc_call_prepare = nfs41_call_sync_prepare,
1043 .rpc_call_done = nfs41_call_sync_done,
1044 };
1045
1046 #else /* !CONFIG_NFS_V4_1 */
1047
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)1048 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1049 {
1050 return nfs40_sequence_done(task, res);
1051 }
1052
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1053 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1054 {
1055 if (res->sr_slot != NULL)
1056 nfs40_sequence_free_slot(res);
1057 }
1058
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1059 int nfs4_sequence_done(struct rpc_task *task,
1060 struct nfs4_sequence_res *res)
1061 {
1062 return nfs40_sequence_done(task, res);
1063 }
1064 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1065
1066 #endif /* !CONFIG_NFS_V4_1 */
1067
nfs41_sequence_res_init(struct nfs4_sequence_res * res)1068 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1069 {
1070 res->sr_timestamp = jiffies;
1071 res->sr_status_flags = 0;
1072 res->sr_status = 1;
1073 }
1074
1075 static
nfs4_sequence_attach_slot(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct nfs4_slot * slot)1076 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1077 struct nfs4_sequence_res *res,
1078 struct nfs4_slot *slot)
1079 {
1080 if (!slot)
1081 return;
1082 slot->privileged = args->sa_privileged ? 1 : 0;
1083 args->sa_slot = slot;
1084
1085 res->sr_slot = slot;
1086 }
1087
nfs4_setup_sequence(struct nfs_client * client,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct rpc_task * task)1088 int nfs4_setup_sequence(struct nfs_client *client,
1089 struct nfs4_sequence_args *args,
1090 struct nfs4_sequence_res *res,
1091 struct rpc_task *task)
1092 {
1093 struct nfs4_session *session = nfs4_get_session(client);
1094 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
1095 struct nfs4_slot *slot;
1096
1097 /* slot already allocated? */
1098 if (res->sr_slot != NULL)
1099 goto out_start;
1100
1101 if (session)
1102 tbl = &session->fc_slot_table;
1103
1104 spin_lock(&tbl->slot_tbl_lock);
1105 /* The state manager will wait until the slot table is empty */
1106 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1107 goto out_sleep;
1108
1109 slot = nfs4_alloc_slot(tbl);
1110 if (IS_ERR(slot)) {
1111 if (slot == ERR_PTR(-ENOMEM))
1112 goto out_sleep_timeout;
1113 goto out_sleep;
1114 }
1115 spin_unlock(&tbl->slot_tbl_lock);
1116
1117 nfs4_sequence_attach_slot(args, res, slot);
1118
1119 trace_nfs4_setup_sequence(session, args);
1120 out_start:
1121 nfs41_sequence_res_init(res);
1122 rpc_call_start(task);
1123 return 0;
1124 out_sleep_timeout:
1125 /* Try again in 1/4 second */
1126 if (args->sa_privileged)
1127 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1128 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1129 else
1130 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1131 NULL, jiffies + (HZ >> 2));
1132 spin_unlock(&tbl->slot_tbl_lock);
1133 return -EAGAIN;
1134 out_sleep:
1135 if (args->sa_privileged)
1136 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1137 RPC_PRIORITY_PRIVILEGED);
1138 else
1139 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1140 spin_unlock(&tbl->slot_tbl_lock);
1141 return -EAGAIN;
1142 }
1143 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1144
nfs40_call_sync_prepare(struct rpc_task * task,void * calldata)1145 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1146 {
1147 struct nfs4_call_sync_data *data = calldata;
1148 nfs4_setup_sequence(data->seq_server->nfs_client,
1149 data->seq_args, data->seq_res, task);
1150 }
1151
nfs40_call_sync_done(struct rpc_task * task,void * calldata)1152 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1153 {
1154 struct nfs4_call_sync_data *data = calldata;
1155 nfs4_sequence_done(task, data->seq_res);
1156 }
1157
1158 static const struct rpc_call_ops nfs40_call_sync_ops = {
1159 .rpc_call_prepare = nfs40_call_sync_prepare,
1160 .rpc_call_done = nfs40_call_sync_done,
1161 };
1162
nfs4_call_sync_custom(struct rpc_task_setup * task_setup)1163 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1164 {
1165 int ret;
1166 struct rpc_task *task;
1167
1168 task = rpc_run_task(task_setup);
1169 if (IS_ERR(task))
1170 return PTR_ERR(task);
1171
1172 ret = task->tk_status;
1173 rpc_put_task(task);
1174 return ret;
1175 }
1176
nfs4_do_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,unsigned short task_flags)1177 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1178 struct nfs_server *server,
1179 struct rpc_message *msg,
1180 struct nfs4_sequence_args *args,
1181 struct nfs4_sequence_res *res,
1182 unsigned short task_flags)
1183 {
1184 struct nfs_client *clp = server->nfs_client;
1185 struct nfs4_call_sync_data data = {
1186 .seq_server = server,
1187 .seq_args = args,
1188 .seq_res = res,
1189 };
1190 struct rpc_task_setup task_setup = {
1191 .rpc_client = clnt,
1192 .rpc_message = msg,
1193 .callback_ops = clp->cl_mvops->call_sync_ops,
1194 .callback_data = &data,
1195 .flags = task_flags,
1196 };
1197
1198 return nfs4_call_sync_custom(&task_setup);
1199 }
1200
nfs4_call_sync_sequence(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res)1201 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1202 struct nfs_server *server,
1203 struct rpc_message *msg,
1204 struct nfs4_sequence_args *args,
1205 struct nfs4_sequence_res *res)
1206 {
1207 unsigned short task_flags = 0;
1208
1209 if (server->caps & NFS_CAP_MOVEABLE)
1210 task_flags = RPC_TASK_MOVEABLE;
1211 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1212 }
1213
1214
nfs4_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply)1215 int nfs4_call_sync(struct rpc_clnt *clnt,
1216 struct nfs_server *server,
1217 struct rpc_message *msg,
1218 struct nfs4_sequence_args *args,
1219 struct nfs4_sequence_res *res,
1220 int cache_reply)
1221 {
1222 nfs4_init_sequence(args, res, cache_reply, 0);
1223 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1224 }
1225
1226 static void
nfs4_inc_nlink_locked(struct inode * inode)1227 nfs4_inc_nlink_locked(struct inode *inode)
1228 {
1229 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1230 NFS_INO_INVALID_CTIME |
1231 NFS_INO_INVALID_NLINK);
1232 inc_nlink(inode);
1233 }
1234
1235 static void
nfs4_inc_nlink(struct inode * inode)1236 nfs4_inc_nlink(struct inode *inode)
1237 {
1238 spin_lock(&inode->i_lock);
1239 nfs4_inc_nlink_locked(inode);
1240 spin_unlock(&inode->i_lock);
1241 }
1242
1243 static void
nfs4_dec_nlink_locked(struct inode * inode)1244 nfs4_dec_nlink_locked(struct inode *inode)
1245 {
1246 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1247 NFS_INO_INVALID_CTIME |
1248 NFS_INO_INVALID_NLINK);
1249 drop_nlink(inode);
1250 }
1251
1252 static void
nfs4_update_changeattr_locked(struct inode * inode,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1253 nfs4_update_changeattr_locked(struct inode *inode,
1254 struct nfs4_change_info *cinfo,
1255 unsigned long timestamp, unsigned long cache_validity)
1256 {
1257 struct nfs_inode *nfsi = NFS_I(inode);
1258 u64 change_attr = inode_peek_iversion_raw(inode);
1259
1260 if (!nfs_have_delegated_mtime(inode))
1261 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1262 if (S_ISDIR(inode->i_mode))
1263 cache_validity |= NFS_INO_INVALID_DATA;
1264
1265 switch (NFS_SERVER(inode)->change_attr_type) {
1266 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1267 if (cinfo->after == change_attr)
1268 goto out;
1269 break;
1270 default:
1271 if ((s64)(change_attr - cinfo->after) >= 0)
1272 goto out;
1273 }
1274
1275 inode_set_iversion_raw(inode, cinfo->after);
1276 if (!cinfo->atomic || cinfo->before != change_attr) {
1277 if (S_ISDIR(inode->i_mode))
1278 nfs_force_lookup_revalidate(inode);
1279
1280 if (!nfs_have_delegated_attributes(inode))
1281 cache_validity |=
1282 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1283 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1284 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1285 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1286 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1287 }
1288 nfsi->attrtimeo_timestamp = jiffies;
1289 nfsi->read_cache_jiffies = timestamp;
1290 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1291 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1292 out:
1293 nfs_set_cache_invalid(inode, cache_validity);
1294 }
1295
1296 void
nfs4_update_changeattr(struct inode * dir,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1297 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1298 unsigned long timestamp, unsigned long cache_validity)
1299 {
1300 spin_lock(&dir->i_lock);
1301 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1302 spin_unlock(&dir->i_lock);
1303 }
1304
1305 struct nfs4_open_createattrs {
1306 struct nfs4_label *label;
1307 struct iattr *sattr;
1308 const __u32 verf[2];
1309 };
1310
nfs4_clear_cap_atomic_open_v1(struct nfs_server * server,int err,struct nfs4_exception * exception)1311 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1312 int err, struct nfs4_exception *exception)
1313 {
1314 if (err != -EINVAL)
1315 return false;
1316 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1317 return false;
1318 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1319 exception->retry = 1;
1320 return true;
1321 }
1322
_nfs4_ctx_to_accessmode(const struct nfs_open_context * ctx)1323 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1324 {
1325 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1326 }
1327
_nfs4_ctx_to_openmode(const struct nfs_open_context * ctx)1328 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1329 {
1330 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1331
1332 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1333 }
1334
1335 static u32
nfs4_fmode_to_share_access(fmode_t fmode)1336 nfs4_fmode_to_share_access(fmode_t fmode)
1337 {
1338 u32 res = 0;
1339
1340 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1341 case FMODE_READ:
1342 res = NFS4_SHARE_ACCESS_READ;
1343 break;
1344 case FMODE_WRITE:
1345 res = NFS4_SHARE_ACCESS_WRITE;
1346 break;
1347 case FMODE_READ|FMODE_WRITE:
1348 res = NFS4_SHARE_ACCESS_BOTH;
1349 }
1350 return res;
1351 }
1352
1353 static u32
nfs4_map_atomic_open_share(struct nfs_server * server,fmode_t fmode,int openflags)1354 nfs4_map_atomic_open_share(struct nfs_server *server,
1355 fmode_t fmode, int openflags)
1356 {
1357 u32 res = nfs4_fmode_to_share_access(fmode);
1358
1359 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1360 goto out;
1361 /* Want no delegation if we're using O_DIRECT */
1362 if (openflags & O_DIRECT) {
1363 res |= NFS4_SHARE_WANT_NO_DELEG;
1364 goto out;
1365 }
1366 /* res |= NFS4_SHARE_WANT_NO_PREFERENCE; */
1367 if (server->caps & NFS_CAP_DELEGTIME)
1368 res |= NFS4_SHARE_WANT_DELEG_TIMESTAMPS;
1369 if (server->caps & NFS_CAP_OPEN_XOR)
1370 res |= NFS4_SHARE_WANT_OPEN_XOR_DELEGATION;
1371 out:
1372 return res;
1373 }
1374
1375 static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server * server,enum open_claim_type4 claim)1376 nfs4_map_atomic_open_claim(struct nfs_server *server,
1377 enum open_claim_type4 claim)
1378 {
1379 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1380 return claim;
1381 switch (claim) {
1382 default:
1383 return claim;
1384 case NFS4_OPEN_CLAIM_FH:
1385 return NFS4_OPEN_CLAIM_NULL;
1386 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1387 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1388 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1389 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1390 }
1391 }
1392
nfs4_init_opendata_res(struct nfs4_opendata * p)1393 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1394 {
1395 p->o_res.f_attr = &p->f_attr;
1396 p->o_res.seqid = p->o_arg.seqid;
1397 p->c_res.seqid = p->c_arg.seqid;
1398 p->o_res.server = p->o_arg.server;
1399 p->o_res.access_request = p->o_arg.access;
1400 nfs_fattr_init(&p->f_attr);
1401 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1402 }
1403
nfs4_opendata_alloc(struct dentry * dentry,struct nfs4_state_owner * sp,fmode_t fmode,int flags,const struct nfs4_open_createattrs * c,enum open_claim_type4 claim,gfp_t gfp_mask)1404 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1405 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1406 const struct nfs4_open_createattrs *c,
1407 enum open_claim_type4 claim,
1408 gfp_t gfp_mask)
1409 {
1410 struct dentry *parent = dget_parent(dentry);
1411 struct inode *dir = d_inode(parent);
1412 struct nfs_server *server = NFS_SERVER(dir);
1413 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1414 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1415 struct nfs4_opendata *p;
1416
1417 p = kzalloc(sizeof(*p), gfp_mask);
1418 if (p == NULL)
1419 goto err;
1420
1421 p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1422 if (IS_ERR(p->f_attr.label))
1423 goto err_free_p;
1424
1425 p->a_label = nfs4_label_alloc(server, gfp_mask);
1426 if (IS_ERR(p->a_label))
1427 goto err_free_f;
1428
1429 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1430 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1431 if (IS_ERR(p->o_arg.seqid))
1432 goto err_free_label;
1433 nfs_sb_active(dentry->d_sb);
1434 p->dentry = dget(dentry);
1435 p->dir = parent;
1436 p->owner = sp;
1437 atomic_inc(&sp->so_count);
1438 p->o_arg.open_flags = flags;
1439 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1440 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1441 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1442 fmode, flags);
1443 if (flags & O_CREAT) {
1444 p->o_arg.umask = current_umask();
1445 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1446 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1447 p->o_arg.u.attrs = &p->attrs;
1448 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1449
1450 memcpy(p->o_arg.u.verifier.data, c->verf,
1451 sizeof(p->o_arg.u.verifier.data));
1452 }
1453 }
1454 /* ask server to check for all possible rights as results
1455 * are cached */
1456 switch (p->o_arg.claim) {
1457 default:
1458 break;
1459 case NFS4_OPEN_CLAIM_NULL:
1460 case NFS4_OPEN_CLAIM_FH:
1461 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1462 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1463 NFS4_ACCESS_EXECUTE |
1464 nfs_access_xattr_mask(server);
1465 }
1466 p->o_arg.clientid = server->nfs_client->cl_clientid;
1467 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1468 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1469 p->o_arg.name = &dentry->d_name;
1470 p->o_arg.server = server;
1471 p->o_arg.bitmask = nfs4_bitmask(server, label);
1472 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1473 switch (p->o_arg.claim) {
1474 case NFS4_OPEN_CLAIM_NULL:
1475 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1476 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1477 p->o_arg.fh = NFS_FH(dir);
1478 break;
1479 case NFS4_OPEN_CLAIM_PREVIOUS:
1480 case NFS4_OPEN_CLAIM_FH:
1481 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1482 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1483 p->o_arg.fh = NFS_FH(d_inode(dentry));
1484 }
1485 p->c_arg.fh = &p->o_res.fh;
1486 p->c_arg.stateid = &p->o_res.stateid;
1487 p->c_arg.seqid = p->o_arg.seqid;
1488 nfs4_init_opendata_res(p);
1489 kref_init(&p->kref);
1490 return p;
1491
1492 err_free_label:
1493 nfs4_label_free(p->a_label);
1494 err_free_f:
1495 nfs4_label_free(p->f_attr.label);
1496 err_free_p:
1497 kfree(p);
1498 err:
1499 dput(parent);
1500 return NULL;
1501 }
1502
nfs4_opendata_free(struct kref * kref)1503 static void nfs4_opendata_free(struct kref *kref)
1504 {
1505 struct nfs4_opendata *p = container_of(kref,
1506 struct nfs4_opendata, kref);
1507 struct super_block *sb = p->dentry->d_sb;
1508
1509 nfs4_lgopen_release(p->lgp);
1510 nfs_free_seqid(p->o_arg.seqid);
1511 nfs4_sequence_free_slot(&p->o_res.seq_res);
1512 if (p->state != NULL)
1513 nfs4_put_open_state(p->state);
1514 nfs4_put_state_owner(p->owner);
1515
1516 nfs4_label_free(p->a_label);
1517 nfs4_label_free(p->f_attr.label);
1518
1519 dput(p->dir);
1520 dput(p->dentry);
1521 nfs_sb_deactive(sb);
1522 nfs_fattr_free_names(&p->f_attr);
1523 kfree(p->f_attr.mdsthreshold);
1524 kfree(p);
1525 }
1526
nfs4_opendata_put(struct nfs4_opendata * p)1527 static void nfs4_opendata_put(struct nfs4_opendata *p)
1528 {
1529 if (p != NULL)
1530 kref_put(&p->kref, nfs4_opendata_free);
1531 }
1532
nfs4_mode_match_open_stateid(struct nfs4_state * state,fmode_t fmode)1533 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1534 fmode_t fmode)
1535 {
1536 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1537 case FMODE_READ|FMODE_WRITE:
1538 return state->n_rdwr != 0;
1539 case FMODE_WRITE:
1540 return state->n_wronly != 0;
1541 case FMODE_READ:
1542 return state->n_rdonly != 0;
1543 }
1544 WARN_ON_ONCE(1);
1545 return false;
1546 }
1547
can_open_cached(struct nfs4_state * state,fmode_t mode,int open_mode,enum open_claim_type4 claim)1548 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1549 int open_mode, enum open_claim_type4 claim)
1550 {
1551 int ret = 0;
1552
1553 if (open_mode & (O_EXCL|O_TRUNC))
1554 goto out;
1555 switch (claim) {
1556 case NFS4_OPEN_CLAIM_NULL:
1557 case NFS4_OPEN_CLAIM_FH:
1558 goto out;
1559 default:
1560 break;
1561 }
1562 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1563 case FMODE_READ:
1564 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1565 && state->n_rdonly != 0;
1566 break;
1567 case FMODE_WRITE:
1568 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1569 && state->n_wronly != 0;
1570 break;
1571 case FMODE_READ|FMODE_WRITE:
1572 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1573 && state->n_rdwr != 0;
1574 }
1575 out:
1576 return ret;
1577 }
1578
can_open_delegated(struct nfs_delegation * delegation,fmode_t fmode,enum open_claim_type4 claim)1579 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1580 enum open_claim_type4 claim)
1581 {
1582 if (delegation == NULL)
1583 return 0;
1584 if ((delegation->type & fmode) != fmode)
1585 return 0;
1586 switch (claim) {
1587 case NFS4_OPEN_CLAIM_NULL:
1588 case NFS4_OPEN_CLAIM_FH:
1589 break;
1590 case NFS4_OPEN_CLAIM_PREVIOUS:
1591 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1592 break;
1593 fallthrough;
1594 default:
1595 return 0;
1596 }
1597 nfs_mark_delegation_referenced(delegation);
1598 return 1;
1599 }
1600
update_open_stateflags(struct nfs4_state * state,fmode_t fmode)1601 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1602 {
1603 switch (fmode) {
1604 case FMODE_WRITE:
1605 state->n_wronly++;
1606 break;
1607 case FMODE_READ:
1608 state->n_rdonly++;
1609 break;
1610 case FMODE_READ|FMODE_WRITE:
1611 state->n_rdwr++;
1612 }
1613 nfs4_state_set_mode_locked(state, state->state | fmode);
1614 }
1615
1616 #ifdef CONFIG_NFS_V4_1
nfs_open_stateid_recover_openmode(struct nfs4_state * state)1617 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1618 {
1619 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1620 return true;
1621 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1622 return true;
1623 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1624 return true;
1625 return false;
1626 }
1627 #endif /* CONFIG_NFS_V4_1 */
1628
nfs_state_log_update_open_stateid(struct nfs4_state * state)1629 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1630 {
1631 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1632 wake_up_all(&state->waitq);
1633 }
1634
nfs_test_and_clear_all_open_stateid(struct nfs4_state * state)1635 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1636 {
1637 struct nfs_client *clp = state->owner->so_server->nfs_client;
1638 bool need_recover = false;
1639
1640 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1641 need_recover = true;
1642 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1643 need_recover = true;
1644 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1645 need_recover = true;
1646 if (need_recover)
1647 nfs4_state_mark_reclaim_nograce(clp, state);
1648 }
1649
1650 /*
1651 * Check for whether or not the caller may update the open stateid
1652 * to the value passed in by stateid.
1653 *
1654 * Note: This function relies heavily on the server implementing
1655 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1656 * correctly.
1657 * i.e. The stateid seqids have to be initialised to 1, and
1658 * are then incremented on every state transition.
1659 */
nfs_stateid_is_sequential(struct nfs4_state * state,const nfs4_stateid * stateid)1660 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1661 const nfs4_stateid *stateid)
1662 {
1663 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1664 /* The common case - we're updating to a new sequence number */
1665 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1666 if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1667 return true;
1668 return false;
1669 }
1670 /* The server returned a new stateid */
1671 }
1672 /* This is the first OPEN in this generation */
1673 if (stateid->seqid == cpu_to_be32(1))
1674 return true;
1675 return false;
1676 }
1677
nfs_resync_open_stateid_locked(struct nfs4_state * state)1678 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1679 {
1680 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1681 return;
1682 if (state->n_wronly)
1683 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1684 if (state->n_rdonly)
1685 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1686 if (state->n_rdwr)
1687 set_bit(NFS_O_RDWR_STATE, &state->flags);
1688 set_bit(NFS_OPEN_STATE, &state->flags);
1689 }
1690
nfs_clear_open_stateid_locked(struct nfs4_state * state,nfs4_stateid * stateid,fmode_t fmode)1691 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1692 nfs4_stateid *stateid, fmode_t fmode)
1693 {
1694 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1695 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1696 case FMODE_WRITE:
1697 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1698 break;
1699 case FMODE_READ:
1700 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1701 break;
1702 case 0:
1703 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1704 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1705 clear_bit(NFS_OPEN_STATE, &state->flags);
1706 }
1707 if (stateid == NULL)
1708 return;
1709 /* Handle OPEN+OPEN_DOWNGRADE races */
1710 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1711 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1712 nfs_resync_open_stateid_locked(state);
1713 goto out;
1714 }
1715 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1716 nfs4_stateid_copy(&state->stateid, stateid);
1717 nfs4_stateid_copy(&state->open_stateid, stateid);
1718 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1719 out:
1720 nfs_state_log_update_open_stateid(state);
1721 }
1722
nfs_clear_open_stateid(struct nfs4_state * state,nfs4_stateid * arg_stateid,nfs4_stateid * stateid,fmode_t fmode)1723 static void nfs_clear_open_stateid(struct nfs4_state *state,
1724 nfs4_stateid *arg_stateid,
1725 nfs4_stateid *stateid, fmode_t fmode)
1726 {
1727 write_seqlock(&state->seqlock);
1728 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1729 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1730 nfs_clear_open_stateid_locked(state, stateid, fmode);
1731 write_sequnlock(&state->seqlock);
1732 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1733 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1734 }
1735
nfs_set_open_stateid_locked(struct nfs4_state * state,const nfs4_stateid * stateid,nfs4_stateid * freeme)1736 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1737 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1738 __must_hold(&state->owner->so_lock)
1739 __must_hold(&state->seqlock)
1740 __must_hold(RCU)
1741
1742 {
1743 DEFINE_WAIT(wait);
1744 int status = 0;
1745 for (;;) {
1746
1747 if (nfs_stateid_is_sequential(state, stateid))
1748 break;
1749
1750 if (status)
1751 break;
1752 /* Rely on seqids for serialisation with NFSv4.0 */
1753 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1754 break;
1755
1756 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1757 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1758 /*
1759 * Ensure we process the state changes in the same order
1760 * in which the server processed them by delaying the
1761 * update of the stateid until we are in sequence.
1762 */
1763 write_sequnlock(&state->seqlock);
1764 spin_unlock(&state->owner->so_lock);
1765 rcu_read_unlock();
1766 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1767
1768 if (!fatal_signal_pending(current)) {
1769 if (schedule_timeout(5*HZ) == 0)
1770 status = -EAGAIN;
1771 else
1772 status = 0;
1773 } else
1774 status = -EINTR;
1775 finish_wait(&state->waitq, &wait);
1776 rcu_read_lock();
1777 spin_lock(&state->owner->so_lock);
1778 write_seqlock(&state->seqlock);
1779 }
1780
1781 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1782 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1783 nfs4_stateid_copy(freeme, &state->open_stateid);
1784 nfs_test_and_clear_all_open_stateid(state);
1785 }
1786
1787 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1788 nfs4_stateid_copy(&state->stateid, stateid);
1789 nfs4_stateid_copy(&state->open_stateid, stateid);
1790 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1791 nfs_state_log_update_open_stateid(state);
1792 }
1793
nfs_state_set_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,fmode_t fmode,nfs4_stateid * freeme)1794 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1795 const nfs4_stateid *open_stateid,
1796 fmode_t fmode,
1797 nfs4_stateid *freeme)
1798 {
1799 /*
1800 * Protect the call to nfs4_state_set_mode_locked and
1801 * serialise the stateid update
1802 */
1803 write_seqlock(&state->seqlock);
1804 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1805 switch (fmode) {
1806 case FMODE_READ:
1807 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1808 break;
1809 case FMODE_WRITE:
1810 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1811 break;
1812 case FMODE_READ|FMODE_WRITE:
1813 set_bit(NFS_O_RDWR_STATE, &state->flags);
1814 }
1815 set_bit(NFS_OPEN_STATE, &state->flags);
1816 write_sequnlock(&state->seqlock);
1817 }
1818
nfs_state_clear_open_state_flags(struct nfs4_state * state)1819 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1820 {
1821 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1822 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1823 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1824 clear_bit(NFS_OPEN_STATE, &state->flags);
1825 }
1826
nfs_state_set_delegation(struct nfs4_state * state,const nfs4_stateid * deleg_stateid,fmode_t fmode)1827 static void nfs_state_set_delegation(struct nfs4_state *state,
1828 const nfs4_stateid *deleg_stateid,
1829 fmode_t fmode)
1830 {
1831 /*
1832 * Protect the call to nfs4_state_set_mode_locked and
1833 * serialise the stateid update
1834 */
1835 write_seqlock(&state->seqlock);
1836 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1837 set_bit(NFS_DELEGATED_STATE, &state->flags);
1838 write_sequnlock(&state->seqlock);
1839 }
1840
nfs_state_clear_delegation(struct nfs4_state * state)1841 static void nfs_state_clear_delegation(struct nfs4_state *state)
1842 {
1843 write_seqlock(&state->seqlock);
1844 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1845 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1846 write_sequnlock(&state->seqlock);
1847 }
1848
update_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,const nfs4_stateid * delegation,fmode_t fmode)1849 int update_open_stateid(struct nfs4_state *state,
1850 const nfs4_stateid *open_stateid,
1851 const nfs4_stateid *delegation,
1852 fmode_t fmode)
1853 {
1854 struct nfs_server *server = NFS_SERVER(state->inode);
1855 struct nfs_client *clp = server->nfs_client;
1856 struct nfs_inode *nfsi = NFS_I(state->inode);
1857 struct nfs_delegation *deleg_cur;
1858 nfs4_stateid freeme = { };
1859 int ret = 0;
1860
1861 fmode &= (FMODE_READ|FMODE_WRITE);
1862
1863 rcu_read_lock();
1864 spin_lock(&state->owner->so_lock);
1865 if (open_stateid != NULL) {
1866 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1867 ret = 1;
1868 }
1869
1870 deleg_cur = nfs4_get_valid_delegation(state->inode);
1871 if (deleg_cur == NULL)
1872 goto no_delegation;
1873
1874 spin_lock(&deleg_cur->lock);
1875 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1876 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1877 (deleg_cur->type & fmode) != fmode)
1878 goto no_delegation_unlock;
1879
1880 if (delegation == NULL)
1881 delegation = &deleg_cur->stateid;
1882 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1883 goto no_delegation_unlock;
1884
1885 nfs_mark_delegation_referenced(deleg_cur);
1886 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1887 ret = 1;
1888 no_delegation_unlock:
1889 spin_unlock(&deleg_cur->lock);
1890 no_delegation:
1891 if (ret)
1892 update_open_stateflags(state, fmode);
1893 spin_unlock(&state->owner->so_lock);
1894 rcu_read_unlock();
1895
1896 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1897 nfs4_schedule_state_manager(clp);
1898 if (freeme.type != 0)
1899 nfs4_test_and_free_stateid(server, &freeme,
1900 state->owner->so_cred);
1901
1902 return ret;
1903 }
1904
nfs4_update_lock_stateid(struct nfs4_lock_state * lsp,const nfs4_stateid * stateid)1905 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1906 const nfs4_stateid *stateid)
1907 {
1908 struct nfs4_state *state = lsp->ls_state;
1909 bool ret = false;
1910
1911 spin_lock(&state->state_lock);
1912 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1913 goto out_noupdate;
1914 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1915 goto out_noupdate;
1916 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1917 ret = true;
1918 out_noupdate:
1919 spin_unlock(&state->state_lock);
1920 return ret;
1921 }
1922
nfs4_return_incompatible_delegation(struct inode * inode,fmode_t fmode)1923 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1924 {
1925 struct nfs_delegation *delegation;
1926
1927 fmode &= FMODE_READ|FMODE_WRITE;
1928 rcu_read_lock();
1929 delegation = nfs4_get_valid_delegation(inode);
1930 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1931 rcu_read_unlock();
1932 return;
1933 }
1934 rcu_read_unlock();
1935 nfs4_inode_return_delegation(inode);
1936 }
1937
nfs4_try_open_cached(struct nfs4_opendata * opendata)1938 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1939 {
1940 struct nfs4_state *state = opendata->state;
1941 struct nfs_delegation *delegation;
1942 int open_mode = opendata->o_arg.open_flags;
1943 fmode_t fmode = opendata->o_arg.fmode;
1944 enum open_claim_type4 claim = opendata->o_arg.claim;
1945 nfs4_stateid stateid;
1946 int ret = -EAGAIN;
1947
1948 for (;;) {
1949 spin_lock(&state->owner->so_lock);
1950 if (can_open_cached(state, fmode, open_mode, claim)) {
1951 update_open_stateflags(state, fmode);
1952 spin_unlock(&state->owner->so_lock);
1953 goto out_return_state;
1954 }
1955 spin_unlock(&state->owner->so_lock);
1956 rcu_read_lock();
1957 delegation = nfs4_get_valid_delegation(state->inode);
1958 if (!can_open_delegated(delegation, fmode, claim)) {
1959 rcu_read_unlock();
1960 break;
1961 }
1962 /* Save the delegation */
1963 nfs4_stateid_copy(&stateid, &delegation->stateid);
1964 rcu_read_unlock();
1965 nfs_release_seqid(opendata->o_arg.seqid);
1966 if (!opendata->is_recover) {
1967 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1968 if (ret != 0)
1969 goto out;
1970 }
1971 ret = -EAGAIN;
1972
1973 /* Try to update the stateid using the delegation */
1974 if (update_open_stateid(state, NULL, &stateid, fmode))
1975 goto out_return_state;
1976 }
1977 out:
1978 return ERR_PTR(ret);
1979 out_return_state:
1980 refcount_inc(&state->count);
1981 return state;
1982 }
1983
1984 static void
nfs4_process_delegation(struct inode * inode,const struct cred * cred,enum open_claim_type4 claim,const struct nfs4_open_delegation * delegation)1985 nfs4_process_delegation(struct inode *inode, const struct cred *cred,
1986 enum open_claim_type4 claim,
1987 const struct nfs4_open_delegation *delegation)
1988 {
1989 switch (delegation->open_delegation_type) {
1990 case NFS4_OPEN_DELEGATE_READ:
1991 case NFS4_OPEN_DELEGATE_WRITE:
1992 case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
1993 case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
1994 break;
1995 default:
1996 return;
1997 }
1998 switch (claim) {
1999 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2000 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2001 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
2002 "returning a delegation for "
2003 "OPEN(CLAIM_DELEGATE_CUR)\n",
2004 NFS_SERVER(inode)->nfs_client->cl_hostname);
2005 break;
2006 case NFS4_OPEN_CLAIM_PREVIOUS:
2007 nfs_inode_reclaim_delegation(inode, cred, delegation->type,
2008 &delegation->stateid,
2009 delegation->pagemod_limit,
2010 delegation->open_delegation_type);
2011 break;
2012 default:
2013 nfs_inode_set_delegation(inode, cred, delegation->type,
2014 &delegation->stateid,
2015 delegation->pagemod_limit,
2016 delegation->open_delegation_type);
2017 }
2018 if (delegation->do_recall)
2019 nfs_async_inode_return_delegation(inode, &delegation->stateid);
2020 }
2021
2022 /*
2023 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
2024 * and update the nfs4_state.
2025 */
2026 static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata * data)2027 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
2028 {
2029 struct inode *inode = data->state->inode;
2030 struct nfs4_state *state = data->state;
2031 int ret;
2032
2033 if (!data->rpc_done) {
2034 if (data->rpc_status)
2035 return ERR_PTR(data->rpc_status);
2036 return nfs4_try_open_cached(data);
2037 }
2038
2039 ret = nfs_refresh_inode(inode, &data->f_attr);
2040 if (ret)
2041 return ERR_PTR(ret);
2042
2043 nfs4_process_delegation(state->inode,
2044 data->owner->so_cred,
2045 data->o_arg.claim,
2046 &data->o_res.delegation);
2047
2048 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2049 if (!update_open_stateid(state, &data->o_res.stateid,
2050 NULL, data->o_arg.fmode))
2051 return ERR_PTR(-EAGAIN);
2052 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode))
2053 return ERR_PTR(-EAGAIN);
2054 refcount_inc(&state->count);
2055
2056 return state;
2057 }
2058
2059 static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata * data)2060 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2061 {
2062 struct inode *inode;
2063
2064 switch (data->o_arg.claim) {
2065 case NFS4_OPEN_CLAIM_NULL:
2066 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2067 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2068 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2069 return ERR_PTR(-EAGAIN);
2070 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2071 &data->f_attr);
2072 break;
2073 default:
2074 inode = d_inode(data->dentry);
2075 ihold(inode);
2076 nfs_refresh_inode(inode, &data->f_attr);
2077 }
2078 return inode;
2079 }
2080
2081 static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata * data)2082 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2083 {
2084 struct nfs4_state *state;
2085 struct inode *inode;
2086
2087 inode = nfs4_opendata_get_inode(data);
2088 if (IS_ERR(inode))
2089 return ERR_CAST(inode);
2090 if (data->state != NULL && data->state->inode == inode) {
2091 state = data->state;
2092 refcount_inc(&state->count);
2093 } else
2094 state = nfs4_get_open_state(inode, data->owner);
2095 iput(inode);
2096 if (state == NULL)
2097 state = ERR_PTR(-ENOMEM);
2098 return state;
2099 }
2100
2101 static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2102 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2103 {
2104 struct nfs4_state *state;
2105
2106 if (!data->rpc_done) {
2107 state = nfs4_try_open_cached(data);
2108 trace_nfs4_cached_open(data->state);
2109 goto out;
2110 }
2111
2112 state = nfs4_opendata_find_nfs4_state(data);
2113 if (IS_ERR(state))
2114 goto out;
2115
2116 nfs4_process_delegation(state->inode,
2117 data->owner->so_cred,
2118 data->o_arg.claim,
2119 &data->o_res.delegation);
2120
2121 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2122 if (!update_open_stateid(state, &data->o_res.stateid,
2123 NULL, data->o_arg.fmode)) {
2124 nfs4_put_open_state(state);
2125 state = ERR_PTR(-EAGAIN);
2126 }
2127 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode)) {
2128 nfs4_put_open_state(state);
2129 state = ERR_PTR(-EAGAIN);
2130 }
2131 out:
2132 nfs_release_seqid(data->o_arg.seqid);
2133 return state;
2134 }
2135
2136 static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2137 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2138 {
2139 struct nfs4_state *ret;
2140
2141 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2142 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2143 else
2144 ret = _nfs4_opendata_to_nfs4_state(data);
2145 nfs4_sequence_free_slot(&data->o_res.seq_res);
2146 return ret;
2147 }
2148
2149 static struct nfs_open_context *
nfs4_state_find_open_context_mode(struct nfs4_state * state,fmode_t mode)2150 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2151 {
2152 struct nfs_inode *nfsi = NFS_I(state->inode);
2153 struct nfs_open_context *ctx;
2154
2155 rcu_read_lock();
2156 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2157 if (ctx->state != state)
2158 continue;
2159 if ((ctx->mode & mode) != mode)
2160 continue;
2161 if (!get_nfs_open_context(ctx))
2162 continue;
2163 rcu_read_unlock();
2164 return ctx;
2165 }
2166 rcu_read_unlock();
2167 return ERR_PTR(-ENOENT);
2168 }
2169
2170 static struct nfs_open_context *
nfs4_state_find_open_context(struct nfs4_state * state)2171 nfs4_state_find_open_context(struct nfs4_state *state)
2172 {
2173 struct nfs_open_context *ctx;
2174
2175 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2176 if (!IS_ERR(ctx))
2177 return ctx;
2178 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2179 if (!IS_ERR(ctx))
2180 return ctx;
2181 return nfs4_state_find_open_context_mode(state, FMODE_READ);
2182 }
2183
nfs4_open_recoverdata_alloc(struct nfs_open_context * ctx,struct nfs4_state * state,enum open_claim_type4 claim)2184 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2185 struct nfs4_state *state, enum open_claim_type4 claim)
2186 {
2187 struct nfs4_opendata *opendata;
2188
2189 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2190 NULL, claim, GFP_NOFS);
2191 if (opendata == NULL)
2192 return ERR_PTR(-ENOMEM);
2193 opendata->state = state;
2194 refcount_inc(&state->count);
2195 return opendata;
2196 }
2197
nfs4_open_recover_helper(struct nfs4_opendata * opendata,fmode_t fmode)2198 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2199 fmode_t fmode)
2200 {
2201 struct nfs4_state *newstate;
2202 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2203 int openflags = opendata->o_arg.open_flags;
2204 int ret;
2205
2206 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2207 return 0;
2208 opendata->o_arg.fmode = fmode;
2209 opendata->o_arg.share_access =
2210 nfs4_map_atomic_open_share(server, fmode, openflags);
2211 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2212 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2213 nfs4_init_opendata_res(opendata);
2214 ret = _nfs4_recover_proc_open(opendata);
2215 if (ret != 0)
2216 return ret;
2217 newstate = nfs4_opendata_to_nfs4_state(opendata);
2218 if (IS_ERR(newstate))
2219 return PTR_ERR(newstate);
2220 if (newstate != opendata->state)
2221 ret = -ESTALE;
2222 nfs4_close_state(newstate, fmode);
2223 return ret;
2224 }
2225
nfs4_open_recover(struct nfs4_opendata * opendata,struct nfs4_state * state)2226 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2227 {
2228 int ret;
2229
2230 /* memory barrier prior to reading state->n_* */
2231 smp_rmb();
2232 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2233 if (ret != 0)
2234 return ret;
2235 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2236 if (ret != 0)
2237 return ret;
2238 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2239 if (ret != 0)
2240 return ret;
2241 /*
2242 * We may have performed cached opens for all three recoveries.
2243 * Check if we need to update the current stateid.
2244 */
2245 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2246 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2247 write_seqlock(&state->seqlock);
2248 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2249 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2250 write_sequnlock(&state->seqlock);
2251 }
2252 return 0;
2253 }
2254
2255 /*
2256 * OPEN_RECLAIM:
2257 * reclaim state on the server after a reboot.
2258 */
_nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2259 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2260 {
2261 struct nfs_delegation *delegation;
2262 struct nfs4_opendata *opendata;
2263 u32 delegation_type = NFS4_OPEN_DELEGATE_NONE;
2264 int status;
2265
2266 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2267 NFS4_OPEN_CLAIM_PREVIOUS);
2268 if (IS_ERR(opendata))
2269 return PTR_ERR(opendata);
2270 rcu_read_lock();
2271 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2272 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) {
2273 switch(delegation->type) {
2274 case FMODE_READ:
2275 delegation_type = NFS4_OPEN_DELEGATE_READ;
2276 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2277 delegation_type = NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG;
2278 break;
2279 case FMODE_WRITE:
2280 case FMODE_READ|FMODE_WRITE:
2281 delegation_type = NFS4_OPEN_DELEGATE_WRITE;
2282 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2283 delegation_type = NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG;
2284 }
2285 }
2286 rcu_read_unlock();
2287 opendata->o_arg.u.delegation_type = delegation_type;
2288 status = nfs4_open_recover(opendata, state);
2289 nfs4_opendata_put(opendata);
2290 return status;
2291 }
2292
nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2293 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2294 {
2295 struct nfs_server *server = NFS_SERVER(state->inode);
2296 struct nfs4_exception exception = { };
2297 int err;
2298 do {
2299 err = _nfs4_do_open_reclaim(ctx, state);
2300 trace_nfs4_open_reclaim(ctx, 0, err);
2301 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2302 continue;
2303 if (err != -NFS4ERR_DELAY)
2304 break;
2305 nfs4_handle_exception(server, err, &exception);
2306 } while (exception.retry);
2307 return err;
2308 }
2309
nfs4_open_reclaim(struct nfs4_state_owner * sp,struct nfs4_state * state)2310 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2311 {
2312 struct nfs_open_context *ctx;
2313 int ret;
2314
2315 ctx = nfs4_state_find_open_context(state);
2316 if (IS_ERR(ctx))
2317 return -EAGAIN;
2318 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2319 nfs_state_clear_open_state_flags(state);
2320 ret = nfs4_do_open_reclaim(ctx, state);
2321 put_nfs_open_context(ctx);
2322 return ret;
2323 }
2324
nfs4_handle_delegation_recall_error(struct nfs_server * server,struct nfs4_state * state,const nfs4_stateid * stateid,struct file_lock * fl,int err)2325 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2326 {
2327 switch (err) {
2328 default:
2329 printk(KERN_ERR "NFS: %s: unhandled error "
2330 "%d.\n", __func__, err);
2331 fallthrough;
2332 case 0:
2333 case -ENOENT:
2334 case -EAGAIN:
2335 case -ESTALE:
2336 case -ETIMEDOUT:
2337 break;
2338 case -NFS4ERR_BADSESSION:
2339 case -NFS4ERR_BADSLOT:
2340 case -NFS4ERR_BAD_HIGH_SLOT:
2341 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2342 case -NFS4ERR_DEADSESSION:
2343 return -EAGAIN;
2344 case -NFS4ERR_STALE_CLIENTID:
2345 case -NFS4ERR_STALE_STATEID:
2346 /* Don't recall a delegation if it was lost */
2347 nfs4_schedule_lease_recovery(server->nfs_client);
2348 return -EAGAIN;
2349 case -NFS4ERR_MOVED:
2350 nfs4_schedule_migration_recovery(server);
2351 return -EAGAIN;
2352 case -NFS4ERR_LEASE_MOVED:
2353 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2354 return -EAGAIN;
2355 case -NFS4ERR_DELEG_REVOKED:
2356 case -NFS4ERR_ADMIN_REVOKED:
2357 case -NFS4ERR_EXPIRED:
2358 case -NFS4ERR_BAD_STATEID:
2359 case -NFS4ERR_OPENMODE:
2360 nfs_inode_find_state_and_recover(state->inode,
2361 stateid);
2362 nfs4_schedule_stateid_recovery(server, state);
2363 return -EAGAIN;
2364 case -NFS4ERR_DELAY:
2365 case -NFS4ERR_GRACE:
2366 ssleep(1);
2367 return -EAGAIN;
2368 case -ENOMEM:
2369 case -NFS4ERR_DENIED:
2370 if (fl) {
2371 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2372 if (lsp)
2373 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2374 }
2375 return 0;
2376 }
2377 return err;
2378 }
2379
nfs4_open_delegation_recall(struct nfs_open_context * ctx,struct nfs4_state * state,const nfs4_stateid * stateid)2380 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2381 struct nfs4_state *state, const nfs4_stateid *stateid)
2382 {
2383 struct nfs_server *server = NFS_SERVER(state->inode);
2384 struct nfs4_opendata *opendata;
2385 int err = 0;
2386
2387 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2388 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2389 if (IS_ERR(opendata))
2390 return PTR_ERR(opendata);
2391 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2392 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2393 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2394 if (err)
2395 goto out;
2396 }
2397 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2398 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2399 if (err)
2400 goto out;
2401 }
2402 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2403 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2404 if (err)
2405 goto out;
2406 }
2407 nfs_state_clear_delegation(state);
2408 out:
2409 nfs4_opendata_put(opendata);
2410 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2411 }
2412
nfs4_open_confirm_prepare(struct rpc_task * task,void * calldata)2413 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2414 {
2415 struct nfs4_opendata *data = calldata;
2416
2417 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2418 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2419 }
2420
nfs4_open_confirm_done(struct rpc_task * task,void * calldata)2421 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2422 {
2423 struct nfs4_opendata *data = calldata;
2424
2425 nfs40_sequence_done(task, &data->c_res.seq_res);
2426
2427 data->rpc_status = task->tk_status;
2428 if (data->rpc_status == 0) {
2429 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2430 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2431 renew_lease(data->o_res.server, data->timestamp);
2432 data->rpc_done = true;
2433 }
2434 }
2435
nfs4_open_confirm_release(void * calldata)2436 static void nfs4_open_confirm_release(void *calldata)
2437 {
2438 struct nfs4_opendata *data = calldata;
2439 struct nfs4_state *state = NULL;
2440
2441 /* If this request hasn't been cancelled, do nothing */
2442 if (!data->cancelled)
2443 goto out_free;
2444 /* In case of error, no cleanup! */
2445 if (!data->rpc_done)
2446 goto out_free;
2447 state = nfs4_opendata_to_nfs4_state(data);
2448 if (!IS_ERR(state))
2449 nfs4_close_state(state, data->o_arg.fmode);
2450 out_free:
2451 nfs4_opendata_put(data);
2452 }
2453
2454 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2455 .rpc_call_prepare = nfs4_open_confirm_prepare,
2456 .rpc_call_done = nfs4_open_confirm_done,
2457 .rpc_release = nfs4_open_confirm_release,
2458 };
2459
2460 /*
2461 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2462 */
_nfs4_proc_open_confirm(struct nfs4_opendata * data)2463 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2464 {
2465 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2466 struct rpc_task *task;
2467 struct rpc_message msg = {
2468 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2469 .rpc_argp = &data->c_arg,
2470 .rpc_resp = &data->c_res,
2471 .rpc_cred = data->owner->so_cred,
2472 };
2473 struct rpc_task_setup task_setup_data = {
2474 .rpc_client = server->client,
2475 .rpc_message = &msg,
2476 .callback_ops = &nfs4_open_confirm_ops,
2477 .callback_data = data,
2478 .workqueue = nfsiod_workqueue,
2479 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2480 };
2481 int status;
2482
2483 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2484 data->is_recover);
2485 kref_get(&data->kref);
2486 data->rpc_done = false;
2487 data->rpc_status = 0;
2488 data->timestamp = jiffies;
2489 task = rpc_run_task(&task_setup_data);
2490 if (IS_ERR(task))
2491 return PTR_ERR(task);
2492 status = rpc_wait_for_completion_task(task);
2493 if (status != 0) {
2494 data->cancelled = true;
2495 smp_wmb();
2496 } else
2497 status = data->rpc_status;
2498 rpc_put_task(task);
2499 return status;
2500 }
2501
nfs4_open_prepare(struct rpc_task * task,void * calldata)2502 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2503 {
2504 struct nfs4_opendata *data = calldata;
2505 struct nfs4_state_owner *sp = data->owner;
2506 struct nfs_client *clp = sp->so_server->nfs_client;
2507 enum open_claim_type4 claim = data->o_arg.claim;
2508
2509 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2510 goto out_wait;
2511 /*
2512 * Check if we still need to send an OPEN call, or if we can use
2513 * a delegation instead.
2514 */
2515 if (data->state != NULL) {
2516 struct nfs_delegation *delegation;
2517
2518 if (can_open_cached(data->state, data->o_arg.fmode,
2519 data->o_arg.open_flags, claim))
2520 goto out_no_action;
2521 rcu_read_lock();
2522 delegation = nfs4_get_valid_delegation(data->state->inode);
2523 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2524 goto unlock_no_action;
2525 rcu_read_unlock();
2526 }
2527 /* Update client id. */
2528 data->o_arg.clientid = clp->cl_clientid;
2529 switch (claim) {
2530 default:
2531 break;
2532 case NFS4_OPEN_CLAIM_PREVIOUS:
2533 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2534 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2535 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2536 fallthrough;
2537 case NFS4_OPEN_CLAIM_FH:
2538 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2539 }
2540 data->timestamp = jiffies;
2541 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2542 &data->o_arg.seq_args,
2543 &data->o_res.seq_res,
2544 task) != 0)
2545 nfs_release_seqid(data->o_arg.seqid);
2546
2547 /* Set the create mode (note dependency on the session type) */
2548 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2549 if (data->o_arg.open_flags & O_EXCL) {
2550 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2551 if (clp->cl_mvops->minor_version == 0) {
2552 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2553 /* don't put an ACCESS op in OPEN compound if O_EXCL,
2554 * because ACCESS will return permission denied for
2555 * all bits until close */
2556 data->o_res.access_request = data->o_arg.access = 0;
2557 } else if (nfs4_has_persistent_session(clp))
2558 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2559 }
2560 return;
2561 unlock_no_action:
2562 trace_nfs4_cached_open(data->state);
2563 rcu_read_unlock();
2564 out_no_action:
2565 task->tk_action = NULL;
2566 out_wait:
2567 nfs4_sequence_done(task, &data->o_res.seq_res);
2568 }
2569
nfs4_open_done(struct rpc_task * task,void * calldata)2570 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2571 {
2572 struct nfs4_opendata *data = calldata;
2573
2574 data->rpc_status = task->tk_status;
2575
2576 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2577 return;
2578
2579 if (task->tk_status == 0) {
2580 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2581 switch (data->o_res.f_attr->mode & S_IFMT) {
2582 case S_IFREG:
2583 break;
2584 case S_IFLNK:
2585 data->rpc_status = -ELOOP;
2586 break;
2587 case S_IFDIR:
2588 data->rpc_status = -EISDIR;
2589 break;
2590 default:
2591 data->rpc_status = -ENOTDIR;
2592 }
2593 }
2594 renew_lease(data->o_res.server, data->timestamp);
2595 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2596 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2597 }
2598 data->rpc_done = true;
2599 }
2600
nfs4_open_release(void * calldata)2601 static void nfs4_open_release(void *calldata)
2602 {
2603 struct nfs4_opendata *data = calldata;
2604 struct nfs4_state *state = NULL;
2605
2606 /* In case of error, no cleanup! */
2607 if (data->rpc_status != 0 || !data->rpc_done) {
2608 nfs_release_seqid(data->o_arg.seqid);
2609 goto out_free;
2610 }
2611 /* If this request hasn't been cancelled, do nothing */
2612 if (!data->cancelled)
2613 goto out_free;
2614 /* In case we need an open_confirm, no cleanup! */
2615 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2616 goto out_free;
2617 state = nfs4_opendata_to_nfs4_state(data);
2618 if (!IS_ERR(state))
2619 nfs4_close_state(state, data->o_arg.fmode);
2620 out_free:
2621 nfs4_opendata_put(data);
2622 }
2623
2624 static const struct rpc_call_ops nfs4_open_ops = {
2625 .rpc_call_prepare = nfs4_open_prepare,
2626 .rpc_call_done = nfs4_open_done,
2627 .rpc_release = nfs4_open_release,
2628 };
2629
nfs4_run_open_task(struct nfs4_opendata * data,struct nfs_open_context * ctx)2630 static int nfs4_run_open_task(struct nfs4_opendata *data,
2631 struct nfs_open_context *ctx)
2632 {
2633 struct inode *dir = d_inode(data->dir);
2634 struct nfs_server *server = NFS_SERVER(dir);
2635 struct nfs_openargs *o_arg = &data->o_arg;
2636 struct nfs_openres *o_res = &data->o_res;
2637 struct rpc_task *task;
2638 struct rpc_message msg = {
2639 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2640 .rpc_argp = o_arg,
2641 .rpc_resp = o_res,
2642 .rpc_cred = data->owner->so_cred,
2643 };
2644 struct rpc_task_setup task_setup_data = {
2645 .rpc_client = server->client,
2646 .rpc_message = &msg,
2647 .callback_ops = &nfs4_open_ops,
2648 .callback_data = data,
2649 .workqueue = nfsiod_workqueue,
2650 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2651 };
2652 int status;
2653
2654 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2655 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2656
2657 kref_get(&data->kref);
2658 data->rpc_done = false;
2659 data->rpc_status = 0;
2660 data->cancelled = false;
2661 data->is_recover = false;
2662 if (!ctx) {
2663 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2664 data->is_recover = true;
2665 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2666 } else {
2667 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2668 pnfs_lgopen_prepare(data, ctx);
2669 }
2670 task = rpc_run_task(&task_setup_data);
2671 if (IS_ERR(task))
2672 return PTR_ERR(task);
2673 status = rpc_wait_for_completion_task(task);
2674 if (status != 0) {
2675 data->cancelled = true;
2676 smp_wmb();
2677 } else
2678 status = data->rpc_status;
2679 rpc_put_task(task);
2680
2681 return status;
2682 }
2683
_nfs4_recover_proc_open(struct nfs4_opendata * data)2684 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2685 {
2686 struct inode *dir = d_inode(data->dir);
2687 struct nfs_openres *o_res = &data->o_res;
2688 int status;
2689
2690 status = nfs4_run_open_task(data, NULL);
2691 if (status != 0 || !data->rpc_done)
2692 return status;
2693
2694 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2695
2696 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2697 status = _nfs4_proc_open_confirm(data);
2698
2699 return status;
2700 }
2701
2702 /*
2703 * Additional permission checks in order to distinguish between an
2704 * open for read, and an open for execute. This works around the
2705 * fact that NFSv4 OPEN treats read and execute permissions as being
2706 * the same.
2707 * Note that in the non-execute case, we want to turn off permission
2708 * checking if we just created a new file (POSIX open() semantics).
2709 */
nfs4_opendata_access(const struct cred * cred,struct nfs4_opendata * opendata,struct nfs4_state * state,fmode_t fmode)2710 static int nfs4_opendata_access(const struct cred *cred,
2711 struct nfs4_opendata *opendata,
2712 struct nfs4_state *state, fmode_t fmode)
2713 {
2714 struct nfs_access_entry cache;
2715 u32 mask, flags;
2716
2717 /* access call failed or for some reason the server doesn't
2718 * support any access modes -- defer access call until later */
2719 if (opendata->o_res.access_supported == 0)
2720 return 0;
2721
2722 mask = 0;
2723 if (fmode & FMODE_EXEC) {
2724 /* ONLY check for exec rights */
2725 if (S_ISDIR(state->inode->i_mode))
2726 mask = NFS4_ACCESS_LOOKUP;
2727 else
2728 mask = NFS4_ACCESS_EXECUTE;
2729 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2730 mask = NFS4_ACCESS_READ;
2731
2732 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2733 nfs_access_add_cache(state->inode, &cache, cred);
2734
2735 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2736 if ((mask & ~cache.mask & flags) == 0)
2737 return 0;
2738
2739 return -EACCES;
2740 }
2741
2742 /*
2743 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2744 */
_nfs4_proc_open(struct nfs4_opendata * data,struct nfs_open_context * ctx)2745 static int _nfs4_proc_open(struct nfs4_opendata *data,
2746 struct nfs_open_context *ctx)
2747 {
2748 struct inode *dir = d_inode(data->dir);
2749 struct nfs_server *server = NFS_SERVER(dir);
2750 struct nfs_openargs *o_arg = &data->o_arg;
2751 struct nfs_openres *o_res = &data->o_res;
2752 int status;
2753
2754 status = nfs4_run_open_task(data, ctx);
2755 if (!data->rpc_done)
2756 return status;
2757 if (status != 0) {
2758 if (status == -NFS4ERR_BADNAME &&
2759 !(o_arg->open_flags & O_CREAT))
2760 return -ENOENT;
2761 return status;
2762 }
2763
2764 nfs_fattr_map_and_free_names(server, &data->f_attr);
2765
2766 if (o_arg->open_flags & O_CREAT) {
2767 if (o_arg->open_flags & O_EXCL)
2768 data->file_created = true;
2769 else if (o_res->cinfo.before != o_res->cinfo.after)
2770 data->file_created = true;
2771 if (data->file_created ||
2772 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2773 nfs4_update_changeattr(dir, &o_res->cinfo,
2774 o_res->f_attr->time_start,
2775 NFS_INO_INVALID_DATA);
2776 }
2777 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2778 server->caps &= ~NFS_CAP_POSIX_LOCK;
2779 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2780 status = _nfs4_proc_open_confirm(data);
2781 if (status != 0)
2782 return status;
2783 }
2784 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2785 struct nfs_fh *fh = &o_res->fh;
2786
2787 nfs4_sequence_free_slot(&o_res->seq_res);
2788 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2789 fh = NFS_FH(d_inode(data->dentry));
2790 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2791 }
2792 return 0;
2793 }
2794
2795 /*
2796 * OPEN_EXPIRED:
2797 * reclaim state on the server after a network partition.
2798 * Assumes caller holds the appropriate lock
2799 */
_nfs4_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2800 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2801 {
2802 struct nfs4_opendata *opendata;
2803 int ret;
2804
2805 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2806 if (IS_ERR(opendata))
2807 return PTR_ERR(opendata);
2808 /*
2809 * We're not recovering a delegation, so ask for no delegation.
2810 * Otherwise the recovery thread could deadlock with an outstanding
2811 * delegation return.
2812 */
2813 opendata->o_arg.open_flags = O_DIRECT;
2814 ret = nfs4_open_recover(opendata, state);
2815 if (ret == -ESTALE)
2816 d_drop(ctx->dentry);
2817 nfs4_opendata_put(opendata);
2818 return ret;
2819 }
2820
nfs4_do_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2821 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2822 {
2823 struct nfs_server *server = NFS_SERVER(state->inode);
2824 struct nfs4_exception exception = { };
2825 int err;
2826
2827 do {
2828 err = _nfs4_open_expired(ctx, state);
2829 trace_nfs4_open_expired(ctx, 0, err);
2830 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2831 continue;
2832 switch (err) {
2833 default:
2834 goto out;
2835 case -NFS4ERR_GRACE:
2836 case -NFS4ERR_DELAY:
2837 nfs4_handle_exception(server, err, &exception);
2838 err = 0;
2839 }
2840 } while (exception.retry);
2841 out:
2842 return err;
2843 }
2844
nfs4_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2845 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2846 {
2847 struct nfs_open_context *ctx;
2848 int ret;
2849
2850 ctx = nfs4_state_find_open_context(state);
2851 if (IS_ERR(ctx))
2852 return -EAGAIN;
2853 ret = nfs4_do_open_expired(ctx, state);
2854 put_nfs_open_context(ctx);
2855 return ret;
2856 }
2857
nfs_finish_clear_delegation_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)2858 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2859 const nfs4_stateid *stateid)
2860 {
2861 nfs_remove_bad_delegation(state->inode, stateid);
2862 nfs_state_clear_delegation(state);
2863 }
2864
nfs40_clear_delegation_stateid(struct nfs4_state * state)2865 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2866 {
2867 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2868 nfs_finish_clear_delegation_stateid(state, NULL);
2869 }
2870
nfs40_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2871 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2872 {
2873 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2874 nfs40_clear_delegation_stateid(state);
2875 nfs_state_clear_open_state_flags(state);
2876 return nfs4_open_expired(sp, state);
2877 }
2878
nfs40_test_and_free_expired_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)2879 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2880 const nfs4_stateid *stateid,
2881 const struct cred *cred)
2882 {
2883 return -NFS4ERR_BAD_STATEID;
2884 }
2885
2886 #if defined(CONFIG_NFS_V4_1)
nfs41_test_and_free_expired_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)2887 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2888 const nfs4_stateid *stateid,
2889 const struct cred *cred)
2890 {
2891 int status;
2892
2893 switch (stateid->type) {
2894 default:
2895 break;
2896 case NFS4_INVALID_STATEID_TYPE:
2897 case NFS4_SPECIAL_STATEID_TYPE:
2898 return -NFS4ERR_BAD_STATEID;
2899 case NFS4_REVOKED_STATEID_TYPE:
2900 goto out_free;
2901 }
2902
2903 status = nfs41_test_stateid(server, stateid, cred);
2904 switch (status) {
2905 case -NFS4ERR_EXPIRED:
2906 case -NFS4ERR_ADMIN_REVOKED:
2907 case -NFS4ERR_DELEG_REVOKED:
2908 break;
2909 default:
2910 return status;
2911 }
2912 out_free:
2913 /* Ack the revoked state to the server */
2914 nfs41_free_stateid(server, stateid, cred, true);
2915 return -NFS4ERR_EXPIRED;
2916 }
2917
nfs41_check_delegation_stateid(struct nfs4_state * state)2918 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2919 {
2920 struct nfs_server *server = NFS_SERVER(state->inode);
2921 nfs4_stateid stateid;
2922 struct nfs_delegation *delegation;
2923 const struct cred *cred = NULL;
2924 int status, ret = NFS_OK;
2925
2926 /* Get the delegation credential for use by test/free_stateid */
2927 rcu_read_lock();
2928 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2929 if (delegation == NULL) {
2930 rcu_read_unlock();
2931 nfs_state_clear_delegation(state);
2932 return NFS_OK;
2933 }
2934
2935 spin_lock(&delegation->lock);
2936 nfs4_stateid_copy(&stateid, &delegation->stateid);
2937
2938 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2939 &delegation->flags)) {
2940 spin_unlock(&delegation->lock);
2941 rcu_read_unlock();
2942 return NFS_OK;
2943 }
2944
2945 if (delegation->cred)
2946 cred = get_cred(delegation->cred);
2947 spin_unlock(&delegation->lock);
2948 rcu_read_unlock();
2949 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2950 trace_nfs4_test_delegation_stateid(state, NULL, status);
2951 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2952 nfs_finish_clear_delegation_stateid(state, &stateid);
2953 else
2954 ret = status;
2955
2956 put_cred(cred);
2957 return ret;
2958 }
2959
nfs41_delegation_recover_stateid(struct nfs4_state * state)2960 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2961 {
2962 nfs4_stateid tmp;
2963
2964 if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2965 nfs4_copy_delegation_stateid(state->inode, state->state,
2966 &tmp, NULL) &&
2967 nfs4_stateid_match_other(&state->stateid, &tmp))
2968 nfs_state_set_delegation(state, &tmp, state->state);
2969 else
2970 nfs_state_clear_delegation(state);
2971 }
2972
2973 /**
2974 * nfs41_check_expired_locks - possibly free a lock stateid
2975 *
2976 * @state: NFSv4 state for an inode
2977 *
2978 * Returns NFS_OK if recovery for this stateid is now finished.
2979 * Otherwise a negative NFS4ERR value is returned.
2980 */
nfs41_check_expired_locks(struct nfs4_state * state)2981 static int nfs41_check_expired_locks(struct nfs4_state *state)
2982 {
2983 int status, ret = NFS_OK;
2984 struct nfs4_lock_state *lsp, *prev = NULL;
2985 struct nfs_server *server = NFS_SERVER(state->inode);
2986
2987 if (!test_bit(LK_STATE_IN_USE, &state->flags))
2988 goto out;
2989
2990 spin_lock(&state->state_lock);
2991 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2992 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2993 const struct cred *cred = lsp->ls_state->owner->so_cred;
2994
2995 refcount_inc(&lsp->ls_count);
2996 spin_unlock(&state->state_lock);
2997
2998 nfs4_put_lock_state(prev);
2999 prev = lsp;
3000
3001 status = nfs41_test_and_free_expired_stateid(server,
3002 &lsp->ls_stateid,
3003 cred);
3004 trace_nfs4_test_lock_stateid(state, lsp, status);
3005 if (status == -NFS4ERR_EXPIRED ||
3006 status == -NFS4ERR_BAD_STATEID) {
3007 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
3008 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
3009 if (!recover_lost_locks)
3010 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
3011 } else if (status != NFS_OK) {
3012 ret = status;
3013 nfs4_put_lock_state(prev);
3014 goto out;
3015 }
3016 spin_lock(&state->state_lock);
3017 }
3018 }
3019 spin_unlock(&state->state_lock);
3020 nfs4_put_lock_state(prev);
3021 out:
3022 return ret;
3023 }
3024
3025 /**
3026 * nfs41_check_open_stateid - possibly free an open stateid
3027 *
3028 * @state: NFSv4 state for an inode
3029 *
3030 * Returns NFS_OK if recovery for this stateid is now finished.
3031 * Otherwise a negative NFS4ERR value is returned.
3032 */
nfs41_check_open_stateid(struct nfs4_state * state)3033 static int nfs41_check_open_stateid(struct nfs4_state *state)
3034 {
3035 struct nfs_server *server = NFS_SERVER(state->inode);
3036 nfs4_stateid *stateid = &state->open_stateid;
3037 const struct cred *cred = state->owner->so_cred;
3038 int status;
3039
3040 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
3041 return -NFS4ERR_BAD_STATEID;
3042 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
3043 trace_nfs4_test_open_stateid(state, NULL, status);
3044 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
3045 nfs_state_clear_open_state_flags(state);
3046 stateid->type = NFS4_INVALID_STATEID_TYPE;
3047 return status;
3048 }
3049 if (nfs_open_stateid_recover_openmode(state))
3050 return -NFS4ERR_OPENMODE;
3051 return NFS_OK;
3052 }
3053
nfs41_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)3054 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
3055 {
3056 int status;
3057
3058 status = nfs41_check_delegation_stateid(state);
3059 if (status != NFS_OK)
3060 return status;
3061 nfs41_delegation_recover_stateid(state);
3062
3063 status = nfs41_check_expired_locks(state);
3064 if (status != NFS_OK)
3065 return status;
3066 status = nfs41_check_open_stateid(state);
3067 if (status != NFS_OK)
3068 status = nfs4_open_expired(sp, state);
3069 return status;
3070 }
3071 #endif
3072
3073 /*
3074 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3075 * fields corresponding to attributes that were used to store the verifier.
3076 * Make sure we clobber those fields in the later setattr call
3077 */
nfs4_exclusive_attrset(struct nfs4_opendata * opendata,struct iattr * sattr,struct nfs4_label ** label)3078 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3079 struct iattr *sattr, struct nfs4_label **label)
3080 {
3081 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3082 __u32 attrset[3];
3083 unsigned ret;
3084 unsigned i;
3085
3086 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3087 attrset[i] = opendata->o_res.attrset[i];
3088 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3089 attrset[i] &= ~bitmask[i];
3090 }
3091
3092 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3093 sattr->ia_valid : 0;
3094
3095 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3096 if (sattr->ia_valid & ATTR_ATIME_SET)
3097 ret |= ATTR_ATIME_SET;
3098 else
3099 ret |= ATTR_ATIME;
3100 }
3101
3102 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3103 if (sattr->ia_valid & ATTR_MTIME_SET)
3104 ret |= ATTR_MTIME_SET;
3105 else
3106 ret |= ATTR_MTIME;
3107 }
3108
3109 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3110 *label = NULL;
3111 return ret;
3112 }
3113
_nfs4_open_and_get_state(struct nfs4_opendata * opendata,struct nfs_open_context * ctx)3114 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3115 struct nfs_open_context *ctx)
3116 {
3117 struct nfs4_state_owner *sp = opendata->owner;
3118 struct nfs_server *server = sp->so_server;
3119 struct dentry *dentry;
3120 struct nfs4_state *state;
3121 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3122 struct inode *dir = d_inode(opendata->dir);
3123 unsigned long dir_verifier;
3124 int ret;
3125
3126 dir_verifier = nfs_save_change_attribute(dir);
3127
3128 ret = _nfs4_proc_open(opendata, ctx);
3129 if (ret != 0)
3130 goto out;
3131
3132 state = _nfs4_opendata_to_nfs4_state(opendata);
3133 ret = PTR_ERR(state);
3134 if (IS_ERR(state))
3135 goto out;
3136 ctx->state = state;
3137 if (server->caps & NFS_CAP_POSIX_LOCK)
3138 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3139 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3140 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3141 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3142 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3143
3144 dentry = opendata->dentry;
3145 if (d_really_is_negative(dentry)) {
3146 struct dentry *alias;
3147 d_drop(dentry);
3148 alias = d_exact_alias(dentry, state->inode);
3149 if (!alias)
3150 alias = d_splice_alias(igrab(state->inode), dentry);
3151 /* d_splice_alias() can't fail here - it's a non-directory */
3152 if (alias) {
3153 dput(ctx->dentry);
3154 ctx->dentry = dentry = alias;
3155 }
3156 }
3157
3158 switch(opendata->o_arg.claim) {
3159 default:
3160 break;
3161 case NFS4_OPEN_CLAIM_NULL:
3162 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3163 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3164 if (!opendata->rpc_done)
3165 break;
3166 if (opendata->o_res.delegation.type != 0)
3167 dir_verifier = nfs_save_change_attribute(dir);
3168 nfs_set_verifier(dentry, dir_verifier);
3169 }
3170
3171 /* Parse layoutget results before we check for access */
3172 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3173
3174 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3175 if (ret != 0)
3176 goto out;
3177
3178 if (d_inode(dentry) == state->inode)
3179 nfs_inode_attach_open_context(ctx);
3180
3181 out:
3182 if (!opendata->cancelled) {
3183 if (opendata->lgp) {
3184 nfs4_lgopen_release(opendata->lgp);
3185 opendata->lgp = NULL;
3186 }
3187 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3188 }
3189 return ret;
3190 }
3191
3192 /*
3193 * Returns a referenced nfs4_state
3194 */
_nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,const struct nfs4_open_createattrs * c,int * opened)3195 static int _nfs4_do_open(struct inode *dir,
3196 struct nfs_open_context *ctx,
3197 int flags,
3198 const struct nfs4_open_createattrs *c,
3199 int *opened)
3200 {
3201 struct nfs4_state_owner *sp;
3202 struct nfs4_state *state = NULL;
3203 struct nfs_server *server = NFS_SERVER(dir);
3204 struct nfs4_opendata *opendata;
3205 struct dentry *dentry = ctx->dentry;
3206 const struct cred *cred = ctx->cred;
3207 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3208 fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3209 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3210 struct iattr *sattr = c->sattr;
3211 struct nfs4_label *label = c->label;
3212 int status;
3213
3214 /* Protect against reboot recovery conflicts */
3215 status = -ENOMEM;
3216 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3217 if (sp == NULL) {
3218 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3219 goto out_err;
3220 }
3221 status = nfs4_client_recover_expired_lease(server->nfs_client);
3222 if (status != 0)
3223 goto err_put_state_owner;
3224 if (d_really_is_positive(dentry))
3225 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3226 status = -ENOMEM;
3227 if (d_really_is_positive(dentry))
3228 claim = NFS4_OPEN_CLAIM_FH;
3229 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3230 c, claim, GFP_KERNEL);
3231 if (opendata == NULL)
3232 goto err_put_state_owner;
3233
3234 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3235 if (!opendata->f_attr.mdsthreshold) {
3236 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3237 if (!opendata->f_attr.mdsthreshold)
3238 goto err_opendata_put;
3239 }
3240 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3241 }
3242 if (d_really_is_positive(dentry))
3243 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3244
3245 status = _nfs4_open_and_get_state(opendata, ctx);
3246 if (status != 0)
3247 goto err_opendata_put;
3248 state = ctx->state;
3249
3250 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3251 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3252 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3253 /*
3254 * send create attributes which was not set by open
3255 * with an extra setattr.
3256 */
3257 if (attrs || label) {
3258 unsigned ia_old = sattr->ia_valid;
3259
3260 sattr->ia_valid = attrs;
3261 nfs_fattr_init(opendata->o_res.f_attr);
3262 status = nfs4_do_setattr(state->inode, cred,
3263 opendata->o_res.f_attr, sattr,
3264 ctx, label);
3265 if (status == 0) {
3266 nfs_setattr_update_inode(state->inode, sattr,
3267 opendata->o_res.f_attr);
3268 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3269 }
3270 sattr->ia_valid = ia_old;
3271 }
3272 }
3273 if (opened && opendata->file_created)
3274 *opened = 1;
3275
3276 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3277 *ctx_th = opendata->f_attr.mdsthreshold;
3278 opendata->f_attr.mdsthreshold = NULL;
3279 }
3280
3281 nfs4_opendata_put(opendata);
3282 nfs4_put_state_owner(sp);
3283 return 0;
3284 err_opendata_put:
3285 nfs4_opendata_put(opendata);
3286 err_put_state_owner:
3287 nfs4_put_state_owner(sp);
3288 out_err:
3289 return status;
3290 }
3291
3292
nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,struct iattr * sattr,struct nfs4_label * label,int * opened)3293 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3294 struct nfs_open_context *ctx,
3295 int flags,
3296 struct iattr *sattr,
3297 struct nfs4_label *label,
3298 int *opened)
3299 {
3300 struct nfs_server *server = NFS_SERVER(dir);
3301 struct nfs4_exception exception = {
3302 .interruptible = true,
3303 };
3304 struct nfs4_state *res;
3305 struct nfs4_open_createattrs c = {
3306 .label = label,
3307 .sattr = sattr,
3308 .verf = {
3309 [0] = (__u32)jiffies,
3310 [1] = (__u32)current->pid,
3311 },
3312 };
3313 int status;
3314
3315 do {
3316 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3317 res = ctx->state;
3318 trace_nfs4_open_file(ctx, flags, status);
3319 if (status == 0)
3320 break;
3321 /* NOTE: BAD_SEQID means the server and client disagree about the
3322 * book-keeping w.r.t. state-changing operations
3323 * (OPEN/CLOSE/LOCK/LOCKU...)
3324 * It is actually a sign of a bug on the client or on the server.
3325 *
3326 * If we receive a BAD_SEQID error in the particular case of
3327 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3328 * have unhashed the old state_owner for us, and that we can
3329 * therefore safely retry using a new one. We should still warn
3330 * the user though...
3331 */
3332 if (status == -NFS4ERR_BAD_SEQID) {
3333 pr_warn_ratelimited("NFS: v4 server %s "
3334 " returned a bad sequence-id error!\n",
3335 NFS_SERVER(dir)->nfs_client->cl_hostname);
3336 exception.retry = 1;
3337 continue;
3338 }
3339 /*
3340 * BAD_STATEID on OPEN means that the server cancelled our
3341 * state before it received the OPEN_CONFIRM.
3342 * Recover by retrying the request as per the discussion
3343 * on Page 181 of RFC3530.
3344 */
3345 if (status == -NFS4ERR_BAD_STATEID) {
3346 exception.retry = 1;
3347 continue;
3348 }
3349 if (status == -NFS4ERR_EXPIRED) {
3350 nfs4_schedule_lease_recovery(server->nfs_client);
3351 exception.retry = 1;
3352 continue;
3353 }
3354 if (status == -EAGAIN) {
3355 /* We must have found a delegation */
3356 exception.retry = 1;
3357 continue;
3358 }
3359 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3360 continue;
3361 res = ERR_PTR(nfs4_handle_exception(server,
3362 status, &exception));
3363 } while (exception.retry);
3364 return res;
3365 }
3366
_nfs4_do_setattr(struct inode * inode,struct nfs_setattrargs * arg,struct nfs_setattrres * res,const struct cred * cred,struct nfs_open_context * ctx)3367 static int _nfs4_do_setattr(struct inode *inode,
3368 struct nfs_setattrargs *arg,
3369 struct nfs_setattrres *res,
3370 const struct cred *cred,
3371 struct nfs_open_context *ctx)
3372 {
3373 struct nfs_server *server = NFS_SERVER(inode);
3374 struct rpc_message msg = {
3375 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3376 .rpc_argp = arg,
3377 .rpc_resp = res,
3378 .rpc_cred = cred,
3379 };
3380 const struct cred *delegation_cred = NULL;
3381 unsigned long timestamp = jiffies;
3382 bool truncate;
3383 int status;
3384
3385 nfs_fattr_init(res->fattr);
3386
3387 /* Servers should only apply open mode checks for file size changes */
3388 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3389 if (!truncate) {
3390 nfs4_inode_make_writeable(inode);
3391 goto zero_stateid;
3392 }
3393
3394 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3395 /* Use that stateid */
3396 } else if (ctx != NULL && ctx->state) {
3397 struct nfs_lock_context *l_ctx;
3398 if (!nfs4_valid_open_stateid(ctx->state))
3399 return -EBADF;
3400 l_ctx = nfs_get_lock_context(ctx);
3401 if (IS_ERR(l_ctx))
3402 return PTR_ERR(l_ctx);
3403 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3404 &arg->stateid, &delegation_cred);
3405 nfs_put_lock_context(l_ctx);
3406 if (status == -EIO)
3407 return -EBADF;
3408 else if (status == -EAGAIN)
3409 goto zero_stateid;
3410 } else {
3411 zero_stateid:
3412 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3413 }
3414 if (delegation_cred)
3415 msg.rpc_cred = delegation_cred;
3416
3417 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3418
3419 put_cred(delegation_cred);
3420 if (status == 0 && ctx != NULL)
3421 renew_lease(server, timestamp);
3422 trace_nfs4_setattr(inode, &arg->stateid, status);
3423 return status;
3424 }
3425
nfs4_do_setattr(struct inode * inode,const struct cred * cred,struct nfs_fattr * fattr,struct iattr * sattr,struct nfs_open_context * ctx,struct nfs4_label * ilabel)3426 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3427 struct nfs_fattr *fattr, struct iattr *sattr,
3428 struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3429 {
3430 struct nfs_server *server = NFS_SERVER(inode);
3431 __u32 bitmask[NFS4_BITMASK_SZ];
3432 struct nfs4_state *state = ctx ? ctx->state : NULL;
3433 struct nfs_setattrargs arg = {
3434 .fh = NFS_FH(inode),
3435 .iap = sattr,
3436 .server = server,
3437 .bitmask = bitmask,
3438 .label = ilabel,
3439 };
3440 struct nfs_setattrres res = {
3441 .fattr = fattr,
3442 .server = server,
3443 };
3444 struct nfs4_exception exception = {
3445 .state = state,
3446 .inode = inode,
3447 .stateid = &arg.stateid,
3448 };
3449 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE |
3450 NFS_INO_INVALID_CTIME;
3451 int err;
3452
3453 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3454 adjust_flags |= NFS_INO_INVALID_MODE;
3455 if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3456 adjust_flags |= NFS_INO_INVALID_OTHER;
3457 if (sattr->ia_valid & ATTR_ATIME)
3458 adjust_flags |= NFS_INO_INVALID_ATIME;
3459 if (sattr->ia_valid & ATTR_MTIME)
3460 adjust_flags |= NFS_INO_INVALID_MTIME;
3461
3462 do {
3463 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3464 inode, adjust_flags);
3465
3466 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3467 switch (err) {
3468 case -NFS4ERR_OPENMODE:
3469 if (!(sattr->ia_valid & ATTR_SIZE)) {
3470 pr_warn_once("NFSv4: server %s is incorrectly "
3471 "applying open mode checks to "
3472 "a SETATTR that is not "
3473 "changing file size.\n",
3474 server->nfs_client->cl_hostname);
3475 }
3476 if (state && !(state->state & FMODE_WRITE)) {
3477 err = -EBADF;
3478 if (sattr->ia_valid & ATTR_OPEN)
3479 err = -EACCES;
3480 goto out;
3481 }
3482 }
3483 err = nfs4_handle_exception(server, err, &exception);
3484 } while (exception.retry);
3485 out:
3486 return err;
3487 }
3488
3489 static bool
nfs4_wait_on_layoutreturn(struct inode * inode,struct rpc_task * task)3490 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3491 {
3492 if (inode == NULL || !nfs_have_layout(inode))
3493 return false;
3494
3495 return pnfs_wait_on_layoutreturn(inode, task);
3496 }
3497
3498 /*
3499 * Update the seqid of an open stateid
3500 */
nfs4_sync_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)3501 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3502 struct nfs4_state *state)
3503 {
3504 __be32 seqid_open;
3505 u32 dst_seqid;
3506 int seq;
3507
3508 for (;;) {
3509 if (!nfs4_valid_open_stateid(state))
3510 break;
3511 seq = read_seqbegin(&state->seqlock);
3512 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3513 nfs4_stateid_copy(dst, &state->open_stateid);
3514 if (read_seqretry(&state->seqlock, seq))
3515 continue;
3516 break;
3517 }
3518 seqid_open = state->open_stateid.seqid;
3519 if (read_seqretry(&state->seqlock, seq))
3520 continue;
3521
3522 dst_seqid = be32_to_cpu(dst->seqid);
3523 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3524 dst->seqid = seqid_open;
3525 break;
3526 }
3527 }
3528
3529 /*
3530 * Update the seqid of an open stateid after receiving
3531 * NFS4ERR_OLD_STATEID
3532 */
nfs4_refresh_open_old_stateid(nfs4_stateid * dst,struct nfs4_state * state)3533 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3534 struct nfs4_state *state)
3535 {
3536 __be32 seqid_open;
3537 u32 dst_seqid;
3538 bool ret;
3539 int seq, status = -EAGAIN;
3540 DEFINE_WAIT(wait);
3541
3542 for (;;) {
3543 ret = false;
3544 if (!nfs4_valid_open_stateid(state))
3545 break;
3546 seq = read_seqbegin(&state->seqlock);
3547 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3548 if (read_seqretry(&state->seqlock, seq))
3549 continue;
3550 break;
3551 }
3552
3553 write_seqlock(&state->seqlock);
3554 seqid_open = state->open_stateid.seqid;
3555
3556 dst_seqid = be32_to_cpu(dst->seqid);
3557
3558 /* Did another OPEN bump the state's seqid? try again: */
3559 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3560 dst->seqid = seqid_open;
3561 write_sequnlock(&state->seqlock);
3562 ret = true;
3563 break;
3564 }
3565
3566 /* server says we're behind but we haven't seen the update yet */
3567 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3568 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3569 write_sequnlock(&state->seqlock);
3570 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3571
3572 if (fatal_signal_pending(current))
3573 status = -EINTR;
3574 else
3575 if (schedule_timeout(5*HZ) != 0)
3576 status = 0;
3577
3578 finish_wait(&state->waitq, &wait);
3579
3580 if (!status)
3581 continue;
3582 if (status == -EINTR)
3583 break;
3584
3585 /* we slept the whole 5 seconds, we must have lost a seqid */
3586 dst->seqid = cpu_to_be32(dst_seqid + 1);
3587 ret = true;
3588 break;
3589 }
3590
3591 return ret;
3592 }
3593
3594 struct nfs4_closedata {
3595 struct inode *inode;
3596 struct nfs4_state *state;
3597 struct nfs_closeargs arg;
3598 struct nfs_closeres res;
3599 struct {
3600 struct nfs4_layoutreturn_args arg;
3601 struct nfs4_layoutreturn_res res;
3602 struct nfs4_xdr_opaque_data ld_private;
3603 u32 roc_barrier;
3604 bool roc;
3605 } lr;
3606 struct nfs_fattr fattr;
3607 unsigned long timestamp;
3608 };
3609
nfs4_free_closedata(void * data)3610 static void nfs4_free_closedata(void *data)
3611 {
3612 struct nfs4_closedata *calldata = data;
3613 struct nfs4_state_owner *sp = calldata->state->owner;
3614 struct super_block *sb = calldata->state->inode->i_sb;
3615
3616 if (calldata->lr.roc)
3617 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3618 calldata->res.lr_ret);
3619 nfs4_put_open_state(calldata->state);
3620 nfs_free_seqid(calldata->arg.seqid);
3621 nfs4_put_state_owner(sp);
3622 nfs_sb_deactive(sb);
3623 kfree(calldata);
3624 }
3625
nfs4_close_done(struct rpc_task * task,void * data)3626 static void nfs4_close_done(struct rpc_task *task, void *data)
3627 {
3628 struct nfs4_closedata *calldata = data;
3629 struct nfs4_state *state = calldata->state;
3630 struct nfs_server *server = NFS_SERVER(calldata->inode);
3631 nfs4_stateid *res_stateid = NULL;
3632 struct nfs4_exception exception = {
3633 .state = state,
3634 .inode = calldata->inode,
3635 .stateid = &calldata->arg.stateid,
3636 };
3637
3638 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3639 return;
3640 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3641
3642 /* Handle Layoutreturn errors */
3643 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3644 &calldata->res.lr_ret) == -EAGAIN)
3645 goto out_restart;
3646
3647 /* hmm. we are done with the inode, and in the process of freeing
3648 * the state_owner. we keep this around to process errors
3649 */
3650 switch (task->tk_status) {
3651 case 0:
3652 res_stateid = &calldata->res.stateid;
3653 renew_lease(server, calldata->timestamp);
3654 break;
3655 case -NFS4ERR_ACCESS:
3656 if (calldata->arg.bitmask != NULL) {
3657 calldata->arg.bitmask = NULL;
3658 calldata->res.fattr = NULL;
3659 goto out_restart;
3660
3661 }
3662 break;
3663 case -NFS4ERR_OLD_STATEID:
3664 /* Did we race with OPEN? */
3665 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3666 state))
3667 goto out_restart;
3668 goto out_release;
3669 case -NFS4ERR_ADMIN_REVOKED:
3670 case -NFS4ERR_STALE_STATEID:
3671 case -NFS4ERR_EXPIRED:
3672 nfs4_free_revoked_stateid(server,
3673 &calldata->arg.stateid,
3674 task->tk_msg.rpc_cred);
3675 fallthrough;
3676 case -NFS4ERR_BAD_STATEID:
3677 if (calldata->arg.fmode == 0)
3678 break;
3679 fallthrough;
3680 default:
3681 task->tk_status = nfs4_async_handle_exception(task,
3682 server, task->tk_status, &exception);
3683 if (exception.retry)
3684 goto out_restart;
3685 }
3686 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3687 res_stateid, calldata->arg.fmode);
3688 out_release:
3689 task->tk_status = 0;
3690 nfs_release_seqid(calldata->arg.seqid);
3691 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3692 dprintk("%s: ret = %d\n", __func__, task->tk_status);
3693 return;
3694 out_restart:
3695 task->tk_status = 0;
3696 rpc_restart_call_prepare(task);
3697 goto out_release;
3698 }
3699
nfs4_close_prepare(struct rpc_task * task,void * data)3700 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3701 {
3702 struct nfs4_closedata *calldata = data;
3703 struct nfs4_state *state = calldata->state;
3704 struct inode *inode = calldata->inode;
3705 struct nfs_server *server = NFS_SERVER(inode);
3706 struct pnfs_layout_hdr *lo;
3707 bool is_rdonly, is_wronly, is_rdwr;
3708 int call_close = 0;
3709
3710 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3711 goto out_wait;
3712
3713 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3714 spin_lock(&state->owner->so_lock);
3715 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3716 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3717 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3718 /* Calculate the change in open mode */
3719 calldata->arg.fmode = 0;
3720 if (state->n_rdwr == 0) {
3721 if (state->n_rdonly == 0)
3722 call_close |= is_rdonly;
3723 else if (is_rdonly)
3724 calldata->arg.fmode |= FMODE_READ;
3725 if (state->n_wronly == 0)
3726 call_close |= is_wronly;
3727 else if (is_wronly)
3728 calldata->arg.fmode |= FMODE_WRITE;
3729 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3730 call_close |= is_rdwr;
3731 } else if (is_rdwr)
3732 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3733
3734 nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3735 if (!nfs4_valid_open_stateid(state))
3736 call_close = 0;
3737 spin_unlock(&state->owner->so_lock);
3738
3739 if (!call_close) {
3740 /* Note: exit _without_ calling nfs4_close_done */
3741 goto out_no_action;
3742 }
3743
3744 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3745 nfs_release_seqid(calldata->arg.seqid);
3746 goto out_wait;
3747 }
3748
3749 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3750 if (lo && !pnfs_layout_is_valid(lo)) {
3751 calldata->arg.lr_args = NULL;
3752 calldata->res.lr_res = NULL;
3753 }
3754
3755 if (calldata->arg.fmode == 0)
3756 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3757
3758 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3759 /* Close-to-open cache consistency revalidation */
3760 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
3761 nfs4_bitmask_set(calldata->arg.bitmask_store,
3762 server->cache_consistency_bitmask,
3763 inode, 0);
3764 calldata->arg.bitmask = calldata->arg.bitmask_store;
3765 } else
3766 calldata->arg.bitmask = NULL;
3767 }
3768
3769 calldata->arg.share_access =
3770 nfs4_fmode_to_share_access(calldata->arg.fmode);
3771
3772 if (calldata->res.fattr == NULL)
3773 calldata->arg.bitmask = NULL;
3774 else if (calldata->arg.bitmask == NULL)
3775 calldata->res.fattr = NULL;
3776 calldata->timestamp = jiffies;
3777 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3778 &calldata->arg.seq_args,
3779 &calldata->res.seq_res,
3780 task) != 0)
3781 nfs_release_seqid(calldata->arg.seqid);
3782 return;
3783 out_no_action:
3784 task->tk_action = NULL;
3785 out_wait:
3786 nfs4_sequence_done(task, &calldata->res.seq_res);
3787 }
3788
3789 static const struct rpc_call_ops nfs4_close_ops = {
3790 .rpc_call_prepare = nfs4_close_prepare,
3791 .rpc_call_done = nfs4_close_done,
3792 .rpc_release = nfs4_free_closedata,
3793 };
3794
3795 /*
3796 * It is possible for data to be read/written from a mem-mapped file
3797 * after the sys_close call (which hits the vfs layer as a flush).
3798 * This means that we can't safely call nfsv4 close on a file until
3799 * the inode is cleared. This in turn means that we are not good
3800 * NFSv4 citizens - we do not indicate to the server to update the file's
3801 * share state even when we are done with one of the three share
3802 * stateid's in the inode.
3803 *
3804 * NOTE: Caller must be holding the sp->so_owner semaphore!
3805 */
nfs4_do_close(struct nfs4_state * state,gfp_t gfp_mask,int wait)3806 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3807 {
3808 struct nfs_server *server = NFS_SERVER(state->inode);
3809 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3810 struct nfs4_closedata *calldata;
3811 struct nfs4_state_owner *sp = state->owner;
3812 struct rpc_task *task;
3813 struct rpc_message msg = {
3814 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3815 .rpc_cred = state->owner->so_cred,
3816 };
3817 struct rpc_task_setup task_setup_data = {
3818 .rpc_client = server->client,
3819 .rpc_message = &msg,
3820 .callback_ops = &nfs4_close_ops,
3821 .workqueue = nfsiod_workqueue,
3822 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3823 };
3824 int status = -ENOMEM;
3825
3826 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3827 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3828
3829 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3830 &task_setup_data.rpc_client, &msg);
3831
3832 calldata = kzalloc(sizeof(*calldata), gfp_mask);
3833 if (calldata == NULL)
3834 goto out;
3835 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3836 calldata->inode = state->inode;
3837 calldata->state = state;
3838 calldata->arg.fh = NFS_FH(state->inode);
3839 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3840 goto out_free_calldata;
3841 /* Serialization for the sequence id */
3842 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3843 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3844 if (IS_ERR(calldata->arg.seqid))
3845 goto out_free_calldata;
3846 nfs_fattr_init(&calldata->fattr);
3847 calldata->arg.fmode = 0;
3848 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3849 calldata->res.fattr = &calldata->fattr;
3850 calldata->res.seqid = calldata->arg.seqid;
3851 calldata->res.server = server;
3852 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3853 calldata->lr.roc = pnfs_roc(state->inode,
3854 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3855 if (calldata->lr.roc) {
3856 calldata->arg.lr_args = &calldata->lr.arg;
3857 calldata->res.lr_res = &calldata->lr.res;
3858 }
3859 nfs_sb_active(calldata->inode->i_sb);
3860
3861 msg.rpc_argp = &calldata->arg;
3862 msg.rpc_resp = &calldata->res;
3863 task_setup_data.callback_data = calldata;
3864 task = rpc_run_task(&task_setup_data);
3865 if (IS_ERR(task))
3866 return PTR_ERR(task);
3867 status = 0;
3868 if (wait)
3869 status = rpc_wait_for_completion_task(task);
3870 rpc_put_task(task);
3871 return status;
3872 out_free_calldata:
3873 kfree(calldata);
3874 out:
3875 nfs4_put_open_state(state);
3876 nfs4_put_state_owner(sp);
3877 return status;
3878 }
3879
3880 static struct inode *
nfs4_atomic_open(struct inode * dir,struct nfs_open_context * ctx,int open_flags,struct iattr * attr,int * opened)3881 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3882 int open_flags, struct iattr *attr, int *opened)
3883 {
3884 struct nfs4_state *state;
3885 struct nfs4_label l, *label;
3886
3887 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3888
3889 /* Protect against concurrent sillydeletes */
3890 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3891
3892 nfs4_label_release_security(label);
3893
3894 if (IS_ERR(state))
3895 return ERR_CAST(state);
3896 return state->inode;
3897 }
3898
nfs4_close_context(struct nfs_open_context * ctx,int is_sync)3899 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3900 {
3901 if (ctx->state == NULL)
3902 return;
3903 if (is_sync)
3904 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3905 else
3906 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3907 }
3908
3909 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3910 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3911 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_OPEN_ARGUMENTS - 1UL)
3912
3913 #define FATTR4_WORD2_NFS42_TIME_DELEG_MASK \
3914 (FATTR4_WORD2_TIME_DELEG_MODIFY|FATTR4_WORD2_TIME_DELEG_ACCESS)
nfs4_server_delegtime_capable(struct nfs4_server_caps_res * res)3915 static bool nfs4_server_delegtime_capable(struct nfs4_server_caps_res *res)
3916 {
3917 u32 share_access_want = res->open_caps.oa_share_access_want[0];
3918 u32 attr_bitmask = res->attr_bitmask[2];
3919
3920 return (share_access_want & NFS4_SHARE_WANT_DELEG_TIMESTAMPS) &&
3921 ((attr_bitmask & FATTR4_WORD2_NFS42_TIME_DELEG_MASK) ==
3922 FATTR4_WORD2_NFS42_TIME_DELEG_MASK);
3923 }
3924
_nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3925 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3926 {
3927 u32 minorversion = server->nfs_client->cl_minorversion;
3928 u32 bitmask[3] = {
3929 [0] = FATTR4_WORD0_SUPPORTED_ATTRS,
3930 };
3931 struct nfs4_server_caps_arg args = {
3932 .fhandle = fhandle,
3933 .bitmask = bitmask,
3934 };
3935 struct nfs4_server_caps_res res = {};
3936 struct rpc_message msg = {
3937 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3938 .rpc_argp = &args,
3939 .rpc_resp = &res,
3940 };
3941 int status;
3942 int i;
3943
3944 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3945 FATTR4_WORD0_FH_EXPIRE_TYPE |
3946 FATTR4_WORD0_LINK_SUPPORT |
3947 FATTR4_WORD0_SYMLINK_SUPPORT |
3948 FATTR4_WORD0_ACLSUPPORT |
3949 FATTR4_WORD0_CASE_INSENSITIVE |
3950 FATTR4_WORD0_CASE_PRESERVING;
3951 if (minorversion)
3952 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT |
3953 FATTR4_WORD2_OPEN_ARGUMENTS;
3954
3955 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3956 if (status == 0) {
3957 bitmask[0] = (FATTR4_WORD0_SUPPORTED_ATTRS |
3958 FATTR4_WORD0_FH_EXPIRE_TYPE |
3959 FATTR4_WORD0_LINK_SUPPORT |
3960 FATTR4_WORD0_SYMLINK_SUPPORT |
3961 FATTR4_WORD0_ACLSUPPORT |
3962 FATTR4_WORD0_CASE_INSENSITIVE |
3963 FATTR4_WORD0_CASE_PRESERVING) &
3964 res.attr_bitmask[0];
3965 /* Sanity check the server answers */
3966 switch (minorversion) {
3967 case 0:
3968 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3969 res.attr_bitmask[2] = 0;
3970 break;
3971 case 1:
3972 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3973 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT &
3974 res.attr_bitmask[2];
3975 break;
3976 case 2:
3977 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3978 bitmask[2] = (FATTR4_WORD2_SUPPATTR_EXCLCREAT |
3979 FATTR4_WORD2_OPEN_ARGUMENTS) &
3980 res.attr_bitmask[2];
3981 }
3982 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3983 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3984 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3985 server->fattr_valid = NFS_ATTR_FATTR_V4;
3986 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3987 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3988 server->caps |= NFS_CAP_ACLS;
3989 if (res.has_links != 0)
3990 server->caps |= NFS_CAP_HARDLINKS;
3991 if (res.has_symlinks != 0)
3992 server->caps |= NFS_CAP_SYMLINKS;
3993 if (res.case_insensitive)
3994 server->caps |= NFS_CAP_CASE_INSENSITIVE;
3995 if (res.case_preserving)
3996 server->caps |= NFS_CAP_CASE_PRESERVING;
3997 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3998 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3999 server->caps |= NFS_CAP_SECURITY_LABEL;
4000 #endif
4001 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
4002 server->caps |= NFS_CAP_FS_LOCATIONS;
4003 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
4004 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
4005 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
4006 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
4007 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
4008 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
4009 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
4010 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
4011 NFS_ATTR_FATTR_OWNER_NAME);
4012 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
4013 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
4014 NFS_ATTR_FATTR_GROUP_NAME);
4015 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
4016 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
4017 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
4018 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
4019 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
4020 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
4021 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
4022 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
4023 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
4024 sizeof(server->attr_bitmask));
4025 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4026
4027 if (res.open_caps.oa_share_access_want[0] &
4028 NFS4_SHARE_WANT_OPEN_XOR_DELEGATION)
4029 server->caps |= NFS_CAP_OPEN_XOR;
4030 if (nfs4_server_delegtime_capable(&res))
4031 server->caps |= NFS_CAP_DELEGTIME;
4032
4033 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
4034 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
4035 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
4036 server->cache_consistency_bitmask[2] = 0;
4037
4038 /* Avoid a regression due to buggy server */
4039 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
4040 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
4041 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
4042 sizeof(server->exclcreat_bitmask));
4043
4044 server->acl_bitmask = res.acl_bitmask;
4045 server->fh_expire_type = res.fh_expire_type;
4046 }
4047
4048 return status;
4049 }
4050
nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)4051 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
4052 {
4053 struct nfs4_exception exception = {
4054 .interruptible = true,
4055 };
4056 int err;
4057
4058 nfs4_server_set_init_caps(server);
4059 do {
4060 err = nfs4_handle_exception(server,
4061 _nfs4_server_capabilities(server, fhandle),
4062 &exception);
4063 } while (exception.retry);
4064 return err;
4065 }
4066
test_fs_location_for_trunking(struct nfs4_fs_location * location,struct nfs_client * clp,struct nfs_server * server)4067 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
4068 struct nfs_client *clp,
4069 struct nfs_server *server)
4070 {
4071 int i;
4072
4073 for (i = 0; i < location->nservers; i++) {
4074 struct nfs4_string *srv_loc = &location->servers[i];
4075 struct sockaddr_storage addr;
4076 size_t addrlen;
4077 struct xprt_create xprt_args = {
4078 .ident = 0,
4079 .net = clp->cl_net,
4080 };
4081 struct nfs4_add_xprt_data xprtdata = {
4082 .clp = clp,
4083 };
4084 struct rpc_add_xprt_test rpcdata = {
4085 .add_xprt_test = clp->cl_mvops->session_trunk,
4086 .data = &xprtdata,
4087 };
4088 char *servername = NULL;
4089
4090 if (!srv_loc->len)
4091 continue;
4092
4093 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4094 &addr, sizeof(addr),
4095 clp->cl_net, server->port);
4096 if (!addrlen)
4097 return;
4098 xprt_args.dstaddr = (struct sockaddr *)&addr;
4099 xprt_args.addrlen = addrlen;
4100 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4101 if (!servername)
4102 return;
4103 memcpy(servername, srv_loc->data, srv_loc->len);
4104 servername[srv_loc->len] = '\0';
4105 xprt_args.servername = servername;
4106
4107 xprtdata.cred = nfs4_get_clid_cred(clp);
4108 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4109 rpc_clnt_setup_test_and_add_xprt,
4110 &rpcdata);
4111 if (xprtdata.cred)
4112 put_cred(xprtdata.cred);
4113 kfree(servername);
4114 }
4115 }
4116
_is_same_nfs4_pathname(struct nfs4_pathname * path1,struct nfs4_pathname * path2)4117 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1,
4118 struct nfs4_pathname *path2)
4119 {
4120 int i;
4121
4122 if (path1->ncomponents != path2->ncomponents)
4123 return false;
4124 for (i = 0; i < path1->ncomponents; i++) {
4125 if (path1->components[i].len != path2->components[i].len)
4126 return false;
4127 if (memcmp(path1->components[i].data, path2->components[i].data,
4128 path1->components[i].len))
4129 return false;
4130 }
4131 return true;
4132 }
4133
_nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4134 static int _nfs4_discover_trunking(struct nfs_server *server,
4135 struct nfs_fh *fhandle)
4136 {
4137 struct nfs4_fs_locations *locations = NULL;
4138 struct page *page;
4139 const struct cred *cred;
4140 struct nfs_client *clp = server->nfs_client;
4141 const struct nfs4_state_maintenance_ops *ops =
4142 clp->cl_mvops->state_renewal_ops;
4143 int status = -ENOMEM, i;
4144
4145 cred = ops->get_state_renewal_cred(clp);
4146 if (cred == NULL) {
4147 cred = nfs4_get_clid_cred(clp);
4148 if (cred == NULL)
4149 return -ENOKEY;
4150 }
4151
4152 page = alloc_page(GFP_KERNEL);
4153 if (!page)
4154 goto out_put_cred;
4155 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4156 if (!locations)
4157 goto out_free;
4158 locations->fattr = nfs_alloc_fattr();
4159 if (!locations->fattr)
4160 goto out_free_2;
4161
4162 status = nfs4_proc_get_locations(server, fhandle, locations, page,
4163 cred);
4164 if (status)
4165 goto out_free_3;
4166
4167 for (i = 0; i < locations->nlocations; i++) {
4168 if (!_is_same_nfs4_pathname(&locations->fs_path,
4169 &locations->locations[i].rootpath))
4170 continue;
4171 test_fs_location_for_trunking(&locations->locations[i], clp,
4172 server);
4173 }
4174 out_free_3:
4175 kfree(locations->fattr);
4176 out_free_2:
4177 kfree(locations);
4178 out_free:
4179 __free_page(page);
4180 out_put_cred:
4181 put_cred(cred);
4182 return status;
4183 }
4184
nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4185 static int nfs4_discover_trunking(struct nfs_server *server,
4186 struct nfs_fh *fhandle)
4187 {
4188 struct nfs4_exception exception = {
4189 .interruptible = true,
4190 };
4191 struct nfs_client *clp = server->nfs_client;
4192 int err = 0;
4193
4194 if (!nfs4_has_session(clp))
4195 goto out;
4196 do {
4197 err = nfs4_handle_exception(server,
4198 _nfs4_discover_trunking(server, fhandle),
4199 &exception);
4200 } while (exception.retry);
4201 out:
4202 return err;
4203 }
4204
_nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4205 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4206 struct nfs_fsinfo *info)
4207 {
4208 u32 bitmask[3];
4209 struct nfs4_lookup_root_arg args = {
4210 .bitmask = bitmask,
4211 };
4212 struct nfs4_lookup_res res = {
4213 .server = server,
4214 .fattr = info->fattr,
4215 .fh = fhandle,
4216 };
4217 struct rpc_message msg = {
4218 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4219 .rpc_argp = &args,
4220 .rpc_resp = &res,
4221 };
4222
4223 bitmask[0] = nfs4_fattr_bitmap[0];
4224 bitmask[1] = nfs4_fattr_bitmap[1];
4225 /*
4226 * Process the label in the upcoming getfattr
4227 */
4228 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4229
4230 nfs_fattr_init(info->fattr);
4231 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4232 }
4233
nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4234 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4235 struct nfs_fsinfo *info)
4236 {
4237 struct nfs4_exception exception = {
4238 .interruptible = true,
4239 };
4240 int err;
4241 do {
4242 err = _nfs4_lookup_root(server, fhandle, info);
4243 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4244 switch (err) {
4245 case 0:
4246 case -NFS4ERR_WRONGSEC:
4247 goto out;
4248 default:
4249 err = nfs4_handle_exception(server, err, &exception);
4250 }
4251 } while (exception.retry);
4252 out:
4253 return err;
4254 }
4255
nfs4_lookup_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,rpc_authflavor_t flavor)4256 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4257 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4258 {
4259 struct rpc_auth_create_args auth_args = {
4260 .pseudoflavor = flavor,
4261 };
4262 struct rpc_auth *auth;
4263
4264 auth = rpcauth_create(&auth_args, server->client);
4265 if (IS_ERR(auth))
4266 return -EACCES;
4267 return nfs4_lookup_root(server, fhandle, info);
4268 }
4269
4270 /*
4271 * Retry pseudoroot lookup with various security flavors. We do this when:
4272 *
4273 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4274 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4275 *
4276 * Returns zero on success, or a negative NFS4ERR value, or a
4277 * negative errno value.
4278 */
nfs4_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4279 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4280 struct nfs_fsinfo *info)
4281 {
4282 /* Per 3530bis 15.33.5 */
4283 static const rpc_authflavor_t flav_array[] = {
4284 RPC_AUTH_GSS_KRB5P,
4285 RPC_AUTH_GSS_KRB5I,
4286 RPC_AUTH_GSS_KRB5,
4287 RPC_AUTH_UNIX, /* courtesy */
4288 RPC_AUTH_NULL,
4289 };
4290 int status = -EPERM;
4291 size_t i;
4292
4293 if (server->auth_info.flavor_len > 0) {
4294 /* try each flavor specified by user */
4295 for (i = 0; i < server->auth_info.flavor_len; i++) {
4296 status = nfs4_lookup_root_sec(server, fhandle, info,
4297 server->auth_info.flavors[i]);
4298 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4299 continue;
4300 break;
4301 }
4302 } else {
4303 /* no flavors specified by user, try default list */
4304 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4305 status = nfs4_lookup_root_sec(server, fhandle, info,
4306 flav_array[i]);
4307 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4308 continue;
4309 break;
4310 }
4311 }
4312
4313 /*
4314 * -EACCES could mean that the user doesn't have correct permissions
4315 * to access the mount. It could also mean that we tried to mount
4316 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
4317 * existing mount programs don't handle -EACCES very well so it should
4318 * be mapped to -EPERM instead.
4319 */
4320 if (status == -EACCES)
4321 status = -EPERM;
4322 return status;
4323 }
4324
4325 /**
4326 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4327 * @server: initialized nfs_server handle
4328 * @fhandle: we fill in the pseudo-fs root file handle
4329 * @info: we fill in an FSINFO struct
4330 * @auth_probe: probe the auth flavours
4331 *
4332 * Returns zero on success, or a negative errno.
4333 */
nfs4_proc_get_rootfh(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,bool auth_probe)4334 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4335 struct nfs_fsinfo *info,
4336 bool auth_probe)
4337 {
4338 int status = 0;
4339
4340 if (!auth_probe)
4341 status = nfs4_lookup_root(server, fhandle, info);
4342
4343 if (auth_probe || status == NFS4ERR_WRONGSEC)
4344 status = server->nfs_client->cl_mvops->find_root_sec(server,
4345 fhandle, info);
4346
4347 if (status == 0)
4348 status = nfs4_server_capabilities(server, fhandle);
4349 if (status == 0)
4350 status = nfs4_do_fsinfo(server, fhandle, info);
4351
4352 return nfs4_map_errors(status);
4353 }
4354
nfs4_proc_get_root(struct nfs_server * server,struct nfs_fh * mntfh,struct nfs_fsinfo * info)4355 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4356 struct nfs_fsinfo *info)
4357 {
4358 int error;
4359 struct nfs_fattr *fattr = info->fattr;
4360
4361 error = nfs4_server_capabilities(server, mntfh);
4362 if (error < 0) {
4363 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4364 return error;
4365 }
4366
4367 error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4368 if (error < 0) {
4369 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4370 goto out;
4371 }
4372
4373 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4374 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4375 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4376
4377 out:
4378 return error;
4379 }
4380
4381 /*
4382 * Get locations and (maybe) other attributes of a referral.
4383 * Note that we'll actually follow the referral later when
4384 * we detect fsid mismatch in inode revalidation
4385 */
nfs4_get_referral(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs_fattr * fattr,struct nfs_fh * fhandle)4386 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4387 const struct qstr *name, struct nfs_fattr *fattr,
4388 struct nfs_fh *fhandle)
4389 {
4390 int status = -ENOMEM;
4391 struct page *page = NULL;
4392 struct nfs4_fs_locations *locations = NULL;
4393
4394 page = alloc_page(GFP_KERNEL);
4395 if (page == NULL)
4396 goto out;
4397 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4398 if (locations == NULL)
4399 goto out;
4400
4401 locations->fattr = fattr;
4402
4403 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4404 if (status != 0)
4405 goto out;
4406
4407 /*
4408 * If the fsid didn't change, this is a migration event, not a
4409 * referral. Cause us to drop into the exception handler, which
4410 * will kick off migration recovery.
4411 */
4412 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4413 dprintk("%s: server did not return a different fsid for"
4414 " a referral at %s\n", __func__, name->name);
4415 status = -NFS4ERR_MOVED;
4416 goto out;
4417 }
4418 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4419 nfs_fixup_referral_attributes(fattr);
4420 memset(fhandle, 0, sizeof(struct nfs_fh));
4421 out:
4422 if (page)
4423 __free_page(page);
4424 kfree(locations);
4425 return status;
4426 }
4427
_nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4428 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4429 struct nfs_fattr *fattr, struct inode *inode)
4430 {
4431 __u32 bitmask[NFS4_BITMASK_SZ];
4432 struct nfs4_getattr_arg args = {
4433 .fh = fhandle,
4434 .bitmask = bitmask,
4435 };
4436 struct nfs4_getattr_res res = {
4437 .fattr = fattr,
4438 .server = server,
4439 };
4440 struct rpc_message msg = {
4441 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4442 .rpc_argp = &args,
4443 .rpc_resp = &res,
4444 };
4445 unsigned short task_flags = 0;
4446
4447 if (nfs4_has_session(server->nfs_client))
4448 task_flags = RPC_TASK_MOVEABLE;
4449
4450 /* Is this is an attribute revalidation, subject to softreval? */
4451 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4452 task_flags |= RPC_TASK_TIMEOUT;
4453
4454 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4455 nfs_fattr_init(fattr);
4456 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4457 return nfs4_do_call_sync(server->client, server, &msg,
4458 &args.seq_args, &res.seq_res, task_flags);
4459 }
4460
nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4461 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4462 struct nfs_fattr *fattr, struct inode *inode)
4463 {
4464 struct nfs4_exception exception = {
4465 .interruptible = true,
4466 };
4467 int err;
4468 do {
4469 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4470 trace_nfs4_getattr(server, fhandle, fattr, err);
4471 err = nfs4_handle_exception(server, err,
4472 &exception);
4473 } while (exception.retry);
4474 return err;
4475 }
4476
4477 /*
4478 * The file is not closed if it is opened due to the a request to change
4479 * the size of the file. The open call will not be needed once the
4480 * VFS layer lookup-intents are implemented.
4481 *
4482 * Close is called when the inode is destroyed.
4483 * If we haven't opened the file for O_WRONLY, we
4484 * need to in the size_change case to obtain a stateid.
4485 *
4486 * Got race?
4487 * Because OPEN is always done by name in nfsv4, it is
4488 * possible that we opened a different file by the same
4489 * name. We can recognize this race condition, but we
4490 * can't do anything about it besides returning an error.
4491 *
4492 * This will be fixed with VFS changes (lookup-intent).
4493 */
4494 static int
nfs4_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)4495 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4496 struct iattr *sattr)
4497 {
4498 struct inode *inode = d_inode(dentry);
4499 const struct cred *cred = NULL;
4500 struct nfs_open_context *ctx = NULL;
4501 int status;
4502
4503 if (pnfs_ld_layoutret_on_setattr(inode) &&
4504 sattr->ia_valid & ATTR_SIZE &&
4505 sattr->ia_size < i_size_read(inode))
4506 pnfs_commit_and_return_layout(inode);
4507
4508 nfs_fattr_init(fattr);
4509
4510 /* Deal with open(O_TRUNC) */
4511 if (sattr->ia_valid & ATTR_OPEN)
4512 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4513
4514 /* Optimization: if the end result is no change, don't RPC */
4515 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4516 return 0;
4517
4518 /* Search for an existing open(O_WRITE) file */
4519 if (sattr->ia_valid & ATTR_FILE) {
4520
4521 ctx = nfs_file_open_context(sattr->ia_file);
4522 if (ctx)
4523 cred = ctx->cred;
4524 }
4525
4526 /* Return any delegations if we're going to change ACLs */
4527 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4528 nfs4_inode_make_writeable(inode);
4529
4530 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4531 if (status == 0) {
4532 nfs_setattr_update_inode(inode, sattr, fattr);
4533 nfs_setsecurity(inode, fattr);
4534 }
4535 return status;
4536 }
4537
_nfs4_proc_lookup(struct rpc_clnt * clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4538 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4539 struct dentry *dentry, struct nfs_fh *fhandle,
4540 struct nfs_fattr *fattr)
4541 {
4542 struct nfs_server *server = NFS_SERVER(dir);
4543 int status;
4544 struct nfs4_lookup_arg args = {
4545 .bitmask = server->attr_bitmask,
4546 .dir_fh = NFS_FH(dir),
4547 .name = &dentry->d_name,
4548 };
4549 struct nfs4_lookup_res res = {
4550 .server = server,
4551 .fattr = fattr,
4552 .fh = fhandle,
4553 };
4554 struct rpc_message msg = {
4555 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4556 .rpc_argp = &args,
4557 .rpc_resp = &res,
4558 };
4559 unsigned short task_flags = 0;
4560
4561 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4562 task_flags = RPC_TASK_MOVEABLE;
4563
4564 /* Is this is an attribute revalidation, subject to softreval? */
4565 if (nfs_lookup_is_soft_revalidate(dentry))
4566 task_flags |= RPC_TASK_TIMEOUT;
4567
4568 args.bitmask = nfs4_bitmask(server, fattr->label);
4569
4570 nfs_fattr_init(fattr);
4571
4572 dprintk("NFS call lookup %pd2\n", dentry);
4573 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4574 status = nfs4_do_call_sync(clnt, server, &msg,
4575 &args.seq_args, &res.seq_res, task_flags);
4576 dprintk("NFS reply lookup: %d\n", status);
4577 return status;
4578 }
4579
nfs_fixup_secinfo_attributes(struct nfs_fattr * fattr)4580 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4581 {
4582 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4583 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4584 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4585 fattr->nlink = 2;
4586 }
4587
nfs4_proc_lookup_common(struct rpc_clnt ** clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4588 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4589 struct dentry *dentry, struct nfs_fh *fhandle,
4590 struct nfs_fattr *fattr)
4591 {
4592 struct nfs4_exception exception = {
4593 .interruptible = true,
4594 };
4595 struct rpc_clnt *client = *clnt;
4596 const struct qstr *name = &dentry->d_name;
4597 int err;
4598 do {
4599 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4600 trace_nfs4_lookup(dir, name, err);
4601 switch (err) {
4602 case -NFS4ERR_BADNAME:
4603 err = -ENOENT;
4604 goto out;
4605 case -NFS4ERR_MOVED:
4606 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4607 if (err == -NFS4ERR_MOVED)
4608 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4609 goto out;
4610 case -NFS4ERR_WRONGSEC:
4611 err = -EPERM;
4612 if (client != *clnt)
4613 goto out;
4614 client = nfs4_negotiate_security(client, dir, name);
4615 if (IS_ERR(client))
4616 return PTR_ERR(client);
4617
4618 exception.retry = 1;
4619 break;
4620 default:
4621 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4622 }
4623 } while (exception.retry);
4624
4625 out:
4626 if (err == 0)
4627 *clnt = client;
4628 else if (client != *clnt)
4629 rpc_shutdown_client(client);
4630
4631 return err;
4632 }
4633
nfs4_proc_lookup(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4634 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4635 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4636 {
4637 int status;
4638 struct rpc_clnt *client = NFS_CLIENT(dir);
4639
4640 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4641 if (client != NFS_CLIENT(dir)) {
4642 rpc_shutdown_client(client);
4643 nfs_fixup_secinfo_attributes(fattr);
4644 }
4645 return status;
4646 }
4647
4648 struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4649 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4650 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4651 {
4652 struct rpc_clnt *client = NFS_CLIENT(dir);
4653 int status;
4654
4655 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4656 if (status < 0)
4657 return ERR_PTR(status);
4658 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4659 }
4660
_nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4661 static int _nfs4_proc_lookupp(struct inode *inode,
4662 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4663 {
4664 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4665 struct nfs_server *server = NFS_SERVER(inode);
4666 int status;
4667 struct nfs4_lookupp_arg args = {
4668 .bitmask = server->attr_bitmask,
4669 .fh = NFS_FH(inode),
4670 };
4671 struct nfs4_lookupp_res res = {
4672 .server = server,
4673 .fattr = fattr,
4674 .fh = fhandle,
4675 };
4676 struct rpc_message msg = {
4677 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4678 .rpc_argp = &args,
4679 .rpc_resp = &res,
4680 };
4681 unsigned short task_flags = 0;
4682
4683 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4684 task_flags |= RPC_TASK_TIMEOUT;
4685
4686 args.bitmask = nfs4_bitmask(server, fattr->label);
4687
4688 nfs_fattr_init(fattr);
4689
4690 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino);
4691 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4692 &res.seq_res, task_flags);
4693 dprintk("NFS reply lookupp: %d\n", status);
4694 return status;
4695 }
4696
nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4697 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4698 struct nfs_fattr *fattr)
4699 {
4700 struct nfs4_exception exception = {
4701 .interruptible = true,
4702 };
4703 int err;
4704 do {
4705 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4706 trace_nfs4_lookupp(inode, err);
4707 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4708 &exception);
4709 } while (exception.retry);
4710 return err;
4711 }
4712
_nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4713 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4714 const struct cred *cred)
4715 {
4716 struct nfs_server *server = NFS_SERVER(inode);
4717 struct nfs4_accessargs args = {
4718 .fh = NFS_FH(inode),
4719 .access = entry->mask,
4720 };
4721 struct nfs4_accessres res = {
4722 .server = server,
4723 };
4724 struct rpc_message msg = {
4725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4726 .rpc_argp = &args,
4727 .rpc_resp = &res,
4728 .rpc_cred = cred,
4729 };
4730 int status = 0;
4731
4732 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
4733 res.fattr = nfs_alloc_fattr();
4734 if (res.fattr == NULL)
4735 return -ENOMEM;
4736 args.bitmask = server->cache_consistency_bitmask;
4737 }
4738 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4739 if (!status) {
4740 nfs_access_set_mask(entry, res.access);
4741 if (res.fattr)
4742 nfs_refresh_inode(inode, res.fattr);
4743 }
4744 nfs_free_fattr(res.fattr);
4745 return status;
4746 }
4747
nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4748 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4749 const struct cred *cred)
4750 {
4751 struct nfs4_exception exception = {
4752 .interruptible = true,
4753 };
4754 int err;
4755 do {
4756 err = _nfs4_proc_access(inode, entry, cred);
4757 trace_nfs4_access(inode, err);
4758 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4759 &exception);
4760 } while (exception.retry);
4761 return err;
4762 }
4763
4764 /*
4765 * TODO: For the time being, we don't try to get any attributes
4766 * along with any of the zero-copy operations READ, READDIR,
4767 * READLINK, WRITE.
4768 *
4769 * In the case of the first three, we want to put the GETATTR
4770 * after the read-type operation -- this is because it is hard
4771 * to predict the length of a GETATTR response in v4, and thus
4772 * align the READ data correctly. This means that the GETATTR
4773 * may end up partially falling into the page cache, and we should
4774 * shift it into the 'tail' of the xdr_buf before processing.
4775 * To do this efficiently, we need to know the total length
4776 * of data received, which doesn't seem to be available outside
4777 * of the RPC layer.
4778 *
4779 * In the case of WRITE, we also want to put the GETATTR after
4780 * the operation -- in this case because we want to make sure
4781 * we get the post-operation mtime and size.
4782 *
4783 * Both of these changes to the XDR layer would in fact be quite
4784 * minor, but I decided to leave them for a subsequent patch.
4785 */
_nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4786 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4787 unsigned int pgbase, unsigned int pglen)
4788 {
4789 struct nfs4_readlink args = {
4790 .fh = NFS_FH(inode),
4791 .pgbase = pgbase,
4792 .pglen = pglen,
4793 .pages = &page,
4794 };
4795 struct nfs4_readlink_res res;
4796 struct rpc_message msg = {
4797 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4798 .rpc_argp = &args,
4799 .rpc_resp = &res,
4800 };
4801
4802 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4803 }
4804
nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4805 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4806 unsigned int pgbase, unsigned int pglen)
4807 {
4808 struct nfs4_exception exception = {
4809 .interruptible = true,
4810 };
4811 int err;
4812 do {
4813 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4814 trace_nfs4_readlink(inode, err);
4815 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4816 &exception);
4817 } while (exception.retry);
4818 return err;
4819 }
4820
4821 /*
4822 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4823 */
4824 static int
nfs4_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)4825 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4826 int flags)
4827 {
4828 struct nfs_server *server = NFS_SERVER(dir);
4829 struct nfs4_label l, *ilabel;
4830 struct nfs_open_context *ctx;
4831 struct nfs4_state *state;
4832 int status = 0;
4833
4834 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4835 if (IS_ERR(ctx))
4836 return PTR_ERR(ctx);
4837
4838 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4839
4840 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4841 sattr->ia_mode &= ~current_umask();
4842 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4843 if (IS_ERR(state)) {
4844 status = PTR_ERR(state);
4845 goto out;
4846 }
4847 out:
4848 nfs4_label_release_security(ilabel);
4849 put_nfs_open_context(ctx);
4850 return status;
4851 }
4852
4853 static int
_nfs4_proc_remove(struct inode * dir,const struct qstr * name,u32 ftype)4854 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4855 {
4856 struct nfs_server *server = NFS_SERVER(dir);
4857 struct nfs_removeargs args = {
4858 .fh = NFS_FH(dir),
4859 .name = *name,
4860 };
4861 struct nfs_removeres res = {
4862 .server = server,
4863 };
4864 struct rpc_message msg = {
4865 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4866 .rpc_argp = &args,
4867 .rpc_resp = &res,
4868 };
4869 unsigned long timestamp = jiffies;
4870 int status;
4871
4872 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4873 if (status == 0) {
4874 spin_lock(&dir->i_lock);
4875 /* Removing a directory decrements nlink in the parent */
4876 if (ftype == NF4DIR && dir->i_nlink > 2)
4877 nfs4_dec_nlink_locked(dir);
4878 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4879 NFS_INO_INVALID_DATA);
4880 spin_unlock(&dir->i_lock);
4881 }
4882 return status;
4883 }
4884
nfs4_proc_remove(struct inode * dir,struct dentry * dentry)4885 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4886 {
4887 struct nfs4_exception exception = {
4888 .interruptible = true,
4889 };
4890 struct inode *inode = d_inode(dentry);
4891 int err;
4892
4893 if (inode) {
4894 if (inode->i_nlink == 1)
4895 nfs4_inode_return_delegation(inode);
4896 else
4897 nfs4_inode_make_writeable(inode);
4898 }
4899 do {
4900 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4901 trace_nfs4_remove(dir, &dentry->d_name, err);
4902 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4903 &exception);
4904 } while (exception.retry);
4905 return err;
4906 }
4907
nfs4_proc_rmdir(struct inode * dir,const struct qstr * name)4908 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4909 {
4910 struct nfs4_exception exception = {
4911 .interruptible = true,
4912 };
4913 int err;
4914
4915 do {
4916 err = _nfs4_proc_remove(dir, name, NF4DIR);
4917 trace_nfs4_remove(dir, name, err);
4918 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4919 &exception);
4920 } while (exception.retry);
4921 return err;
4922 }
4923
nfs4_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)4924 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4925 struct dentry *dentry,
4926 struct inode *inode)
4927 {
4928 struct nfs_removeargs *args = msg->rpc_argp;
4929 struct nfs_removeres *res = msg->rpc_resp;
4930
4931 res->server = NFS_SB(dentry->d_sb);
4932 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4933 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4934
4935 nfs_fattr_init(res->dir_attr);
4936
4937 if (inode) {
4938 nfs4_inode_return_delegation(inode);
4939 nfs_d_prune_case_insensitive_aliases(inode);
4940 }
4941 }
4942
nfs4_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)4943 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4944 {
4945 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4946 &data->args.seq_args,
4947 &data->res.seq_res,
4948 task);
4949 }
4950
nfs4_proc_unlink_done(struct rpc_task * task,struct inode * dir)4951 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4952 {
4953 struct nfs_unlinkdata *data = task->tk_calldata;
4954 struct nfs_removeres *res = &data->res;
4955
4956 if (!nfs4_sequence_done(task, &res->seq_res))
4957 return 0;
4958 if (nfs4_async_handle_error(task, res->server, NULL,
4959 &data->timeout) == -EAGAIN)
4960 return 0;
4961 if (task->tk_status == 0)
4962 nfs4_update_changeattr(dir, &res->cinfo,
4963 res->dir_attr->time_start,
4964 NFS_INO_INVALID_DATA);
4965 return 1;
4966 }
4967
nfs4_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)4968 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4969 struct dentry *old_dentry,
4970 struct dentry *new_dentry)
4971 {
4972 struct nfs_renameargs *arg = msg->rpc_argp;
4973 struct nfs_renameres *res = msg->rpc_resp;
4974 struct inode *old_inode = d_inode(old_dentry);
4975 struct inode *new_inode = d_inode(new_dentry);
4976
4977 if (old_inode)
4978 nfs4_inode_make_writeable(old_inode);
4979 if (new_inode)
4980 nfs4_inode_return_delegation(new_inode);
4981 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4982 res->server = NFS_SB(old_dentry->d_sb);
4983 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4984 }
4985
nfs4_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)4986 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4987 {
4988 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4989 &data->args.seq_args,
4990 &data->res.seq_res,
4991 task);
4992 }
4993
nfs4_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)4994 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4995 struct inode *new_dir)
4996 {
4997 struct nfs_renamedata *data = task->tk_calldata;
4998 struct nfs_renameres *res = &data->res;
4999
5000 if (!nfs4_sequence_done(task, &res->seq_res))
5001 return 0;
5002 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
5003 return 0;
5004
5005 if (task->tk_status == 0) {
5006 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
5007 if (new_dir != old_dir) {
5008 /* Note: If we moved a directory, nlink will change */
5009 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5010 res->old_fattr->time_start,
5011 NFS_INO_INVALID_NLINK |
5012 NFS_INO_INVALID_DATA);
5013 nfs4_update_changeattr(new_dir, &res->new_cinfo,
5014 res->new_fattr->time_start,
5015 NFS_INO_INVALID_NLINK |
5016 NFS_INO_INVALID_DATA);
5017 } else
5018 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5019 res->old_fattr->time_start,
5020 NFS_INO_INVALID_DATA);
5021 }
5022 return 1;
5023 }
5024
_nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5025 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5026 {
5027 struct nfs_server *server = NFS_SERVER(inode);
5028 __u32 bitmask[NFS4_BITMASK_SZ];
5029 struct nfs4_link_arg arg = {
5030 .fh = NFS_FH(inode),
5031 .dir_fh = NFS_FH(dir),
5032 .name = name,
5033 .bitmask = bitmask,
5034 };
5035 struct nfs4_link_res res = {
5036 .server = server,
5037 };
5038 struct rpc_message msg = {
5039 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
5040 .rpc_argp = &arg,
5041 .rpc_resp = &res,
5042 };
5043 int status = -ENOMEM;
5044
5045 res.fattr = nfs_alloc_fattr_with_label(server);
5046 if (res.fattr == NULL)
5047 goto out;
5048
5049 nfs4_inode_make_writeable(inode);
5050 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label),
5051 inode,
5052 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME);
5053 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5054 if (!status) {
5055 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
5056 NFS_INO_INVALID_DATA);
5057 nfs4_inc_nlink(inode);
5058 status = nfs_post_op_update_inode(inode, res.fattr);
5059 if (!status)
5060 nfs_setsecurity(inode, res.fattr);
5061 }
5062
5063 out:
5064 nfs_free_fattr(res.fattr);
5065 return status;
5066 }
5067
nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5068 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5069 {
5070 struct nfs4_exception exception = {
5071 .interruptible = true,
5072 };
5073 int err;
5074 do {
5075 err = nfs4_handle_exception(NFS_SERVER(inode),
5076 _nfs4_proc_link(inode, dir, name),
5077 &exception);
5078 } while (exception.retry);
5079 return err;
5080 }
5081
5082 struct nfs4_createdata {
5083 struct rpc_message msg;
5084 struct nfs4_create_arg arg;
5085 struct nfs4_create_res res;
5086 struct nfs_fh fh;
5087 struct nfs_fattr fattr;
5088 };
5089
nfs4_alloc_createdata(struct inode * dir,const struct qstr * name,struct iattr * sattr,u32 ftype)5090 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
5091 const struct qstr *name, struct iattr *sattr, u32 ftype)
5092 {
5093 struct nfs4_createdata *data;
5094
5095 data = kzalloc(sizeof(*data), GFP_KERNEL);
5096 if (data != NULL) {
5097 struct nfs_server *server = NFS_SERVER(dir);
5098
5099 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
5100 if (IS_ERR(data->fattr.label))
5101 goto out_free;
5102
5103 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
5104 data->msg.rpc_argp = &data->arg;
5105 data->msg.rpc_resp = &data->res;
5106 data->arg.dir_fh = NFS_FH(dir);
5107 data->arg.server = server;
5108 data->arg.name = name;
5109 data->arg.attrs = sattr;
5110 data->arg.ftype = ftype;
5111 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
5112 data->arg.umask = current_umask();
5113 data->res.server = server;
5114 data->res.fh = &data->fh;
5115 data->res.fattr = &data->fattr;
5116 nfs_fattr_init(data->res.fattr);
5117 }
5118 return data;
5119 out_free:
5120 kfree(data);
5121 return NULL;
5122 }
5123
nfs4_do_create(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data)5124 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5125 {
5126 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5127 &data->arg.seq_args, &data->res.seq_res, 1);
5128 if (status == 0) {
5129 spin_lock(&dir->i_lock);
5130 /* Creating a directory bumps nlink in the parent */
5131 if (data->arg.ftype == NF4DIR)
5132 nfs4_inc_nlink_locked(dir);
5133 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5134 data->res.fattr->time_start,
5135 NFS_INO_INVALID_DATA);
5136 spin_unlock(&dir->i_lock);
5137 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5138 }
5139 return status;
5140 }
5141
nfs4_free_createdata(struct nfs4_createdata * data)5142 static void nfs4_free_createdata(struct nfs4_createdata *data)
5143 {
5144 nfs4_label_free(data->fattr.label);
5145 kfree(data);
5146 }
5147
_nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr,struct nfs4_label * label)5148 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5149 struct folio *folio, unsigned int len, struct iattr *sattr,
5150 struct nfs4_label *label)
5151 {
5152 struct page *page = &folio->page;
5153 struct nfs4_createdata *data;
5154 int status = -ENAMETOOLONG;
5155
5156 if (len > NFS4_MAXPATHLEN)
5157 goto out;
5158
5159 status = -ENOMEM;
5160 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5161 if (data == NULL)
5162 goto out;
5163
5164 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5165 data->arg.u.symlink.pages = &page;
5166 data->arg.u.symlink.len = len;
5167 data->arg.label = label;
5168
5169 status = nfs4_do_create(dir, dentry, data);
5170
5171 nfs4_free_createdata(data);
5172 out:
5173 return status;
5174 }
5175
nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)5176 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5177 struct folio *folio, unsigned int len, struct iattr *sattr)
5178 {
5179 struct nfs4_exception exception = {
5180 .interruptible = true,
5181 };
5182 struct nfs4_label l, *label;
5183 int err;
5184
5185 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5186
5187 do {
5188 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
5189 trace_nfs4_symlink(dir, &dentry->d_name, err);
5190 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5191 &exception);
5192 } while (exception.retry);
5193
5194 nfs4_label_release_security(label);
5195 return err;
5196 }
5197
_nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)5198 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5199 struct iattr *sattr, struct nfs4_label *label)
5200 {
5201 struct nfs4_createdata *data;
5202 int status = -ENOMEM;
5203
5204 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5205 if (data == NULL)
5206 goto out;
5207
5208 data->arg.label = label;
5209 status = nfs4_do_create(dir, dentry, data);
5210
5211 nfs4_free_createdata(data);
5212 out:
5213 return status;
5214 }
5215
nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)5216 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5217 struct iattr *sattr)
5218 {
5219 struct nfs_server *server = NFS_SERVER(dir);
5220 struct nfs4_exception exception = {
5221 .interruptible = true,
5222 };
5223 struct nfs4_label l, *label;
5224 int err;
5225
5226 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5227
5228 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5229 sattr->ia_mode &= ~current_umask();
5230 do {
5231 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5232 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5233 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5234 &exception);
5235 } while (exception.retry);
5236 nfs4_label_release_security(label);
5237
5238 return err;
5239 }
5240
_nfs4_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)5241 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5242 struct nfs_readdir_res *nr_res)
5243 {
5244 struct inode *dir = d_inode(nr_arg->dentry);
5245 struct nfs_server *server = NFS_SERVER(dir);
5246 struct nfs4_readdir_arg args = {
5247 .fh = NFS_FH(dir),
5248 .pages = nr_arg->pages,
5249 .pgbase = 0,
5250 .count = nr_arg->page_len,
5251 .plus = nr_arg->plus,
5252 };
5253 struct nfs4_readdir_res res;
5254 struct rpc_message msg = {
5255 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5256 .rpc_argp = &args,
5257 .rpc_resp = &res,
5258 .rpc_cred = nr_arg->cred,
5259 };
5260 int status;
5261
5262 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5263 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5264 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5265 args.bitmask = server->attr_bitmask_nl;
5266 else
5267 args.bitmask = server->attr_bitmask;
5268
5269 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5270 res.pgbase = args.pgbase;
5271 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5272 &res.seq_res, 0);
5273 if (status >= 0) {
5274 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5275 status += args.pgbase;
5276 }
5277
5278 nfs_invalidate_atime(dir);
5279
5280 dprintk("%s: returns %d\n", __func__, status);
5281 return status;
5282 }
5283
nfs4_proc_readdir(struct nfs_readdir_arg * arg,struct nfs_readdir_res * res)5284 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5285 struct nfs_readdir_res *res)
5286 {
5287 struct nfs4_exception exception = {
5288 .interruptible = true,
5289 };
5290 int err;
5291 do {
5292 err = _nfs4_proc_readdir(arg, res);
5293 trace_nfs4_readdir(d_inode(arg->dentry), err);
5294 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5295 err, &exception);
5296 } while (exception.retry);
5297 return err;
5298 }
5299
_nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,dev_t rdev)5300 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5301 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5302 {
5303 struct nfs4_createdata *data;
5304 int mode = sattr->ia_mode;
5305 int status = -ENOMEM;
5306
5307 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5308 if (data == NULL)
5309 goto out;
5310
5311 if (S_ISFIFO(mode))
5312 data->arg.ftype = NF4FIFO;
5313 else if (S_ISBLK(mode)) {
5314 data->arg.ftype = NF4BLK;
5315 data->arg.u.device.specdata1 = MAJOR(rdev);
5316 data->arg.u.device.specdata2 = MINOR(rdev);
5317 }
5318 else if (S_ISCHR(mode)) {
5319 data->arg.ftype = NF4CHR;
5320 data->arg.u.device.specdata1 = MAJOR(rdev);
5321 data->arg.u.device.specdata2 = MINOR(rdev);
5322 } else if (!S_ISSOCK(mode)) {
5323 status = -EINVAL;
5324 goto out_free;
5325 }
5326
5327 data->arg.label = label;
5328 status = nfs4_do_create(dir, dentry, data);
5329 out_free:
5330 nfs4_free_createdata(data);
5331 out:
5332 return status;
5333 }
5334
nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)5335 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5336 struct iattr *sattr, dev_t rdev)
5337 {
5338 struct nfs_server *server = NFS_SERVER(dir);
5339 struct nfs4_exception exception = {
5340 .interruptible = true,
5341 };
5342 struct nfs4_label l, *label;
5343 int err;
5344
5345 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5346
5347 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5348 sattr->ia_mode &= ~current_umask();
5349 do {
5350 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5351 trace_nfs4_mknod(dir, &dentry->d_name, err);
5352 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5353 &exception);
5354 } while (exception.retry);
5355
5356 nfs4_label_release_security(label);
5357
5358 return err;
5359 }
5360
_nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5361 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5362 struct nfs_fsstat *fsstat)
5363 {
5364 struct nfs4_statfs_arg args = {
5365 .fh = fhandle,
5366 .bitmask = server->attr_bitmask,
5367 };
5368 struct nfs4_statfs_res res = {
5369 .fsstat = fsstat,
5370 };
5371 struct rpc_message msg = {
5372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5373 .rpc_argp = &args,
5374 .rpc_resp = &res,
5375 };
5376
5377 nfs_fattr_init(fsstat->fattr);
5378 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5379 }
5380
nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5381 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5382 {
5383 struct nfs4_exception exception = {
5384 .interruptible = true,
5385 };
5386 int err;
5387 do {
5388 err = nfs4_handle_exception(server,
5389 _nfs4_proc_statfs(server, fhandle, fsstat),
5390 &exception);
5391 } while (exception.retry);
5392 return err;
5393 }
5394
_nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5395 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5396 struct nfs_fsinfo *fsinfo)
5397 {
5398 struct nfs4_fsinfo_arg args = {
5399 .fh = fhandle,
5400 .bitmask = server->attr_bitmask,
5401 };
5402 struct nfs4_fsinfo_res res = {
5403 .fsinfo = fsinfo,
5404 };
5405 struct rpc_message msg = {
5406 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5407 .rpc_argp = &args,
5408 .rpc_resp = &res,
5409 };
5410
5411 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5412 }
5413
nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5414 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5415 {
5416 struct nfs4_exception exception = {
5417 .interruptible = true,
5418 };
5419 int err;
5420
5421 do {
5422 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5423 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5424 if (err == 0) {
5425 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5426 break;
5427 }
5428 err = nfs4_handle_exception(server, err, &exception);
5429 } while (exception.retry);
5430 return err;
5431 }
5432
nfs4_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5433 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5434 {
5435 int error;
5436
5437 nfs_fattr_init(fsinfo->fattr);
5438 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5439 if (error == 0) {
5440 /* block layout checks this! */
5441 server->pnfs_blksize = fsinfo->blksize;
5442 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5443 }
5444
5445 return error;
5446 }
5447
_nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5448 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5449 struct nfs_pathconf *pathconf)
5450 {
5451 struct nfs4_pathconf_arg args = {
5452 .fh = fhandle,
5453 .bitmask = server->attr_bitmask,
5454 };
5455 struct nfs4_pathconf_res res = {
5456 .pathconf = pathconf,
5457 };
5458 struct rpc_message msg = {
5459 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5460 .rpc_argp = &args,
5461 .rpc_resp = &res,
5462 };
5463
5464 /* None of the pathconf attributes are mandatory to implement */
5465 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5466 memset(pathconf, 0, sizeof(*pathconf));
5467 return 0;
5468 }
5469
5470 nfs_fattr_init(pathconf->fattr);
5471 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5472 }
5473
nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5474 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5475 struct nfs_pathconf *pathconf)
5476 {
5477 struct nfs4_exception exception = {
5478 .interruptible = true,
5479 };
5480 int err;
5481
5482 do {
5483 err = nfs4_handle_exception(server,
5484 _nfs4_proc_pathconf(server, fhandle, pathconf),
5485 &exception);
5486 } while (exception.retry);
5487 return err;
5488 }
5489
nfs4_set_rw_stateid(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5490 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5491 const struct nfs_open_context *ctx,
5492 const struct nfs_lock_context *l_ctx,
5493 fmode_t fmode)
5494 {
5495 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5496 }
5497 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5498
nfs4_stateid_is_current(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5499 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5500 const struct nfs_open_context *ctx,
5501 const struct nfs_lock_context *l_ctx,
5502 fmode_t fmode)
5503 {
5504 nfs4_stateid _current_stateid;
5505
5506 /* If the current stateid represents a lost lock, then exit */
5507 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5508 return true;
5509 return nfs4_stateid_match(stateid, &_current_stateid);
5510 }
5511
nfs4_error_stateid_expired(int err)5512 static bool nfs4_error_stateid_expired(int err)
5513 {
5514 switch (err) {
5515 case -NFS4ERR_DELEG_REVOKED:
5516 case -NFS4ERR_ADMIN_REVOKED:
5517 case -NFS4ERR_BAD_STATEID:
5518 case -NFS4ERR_STALE_STATEID:
5519 case -NFS4ERR_OLD_STATEID:
5520 case -NFS4ERR_OPENMODE:
5521 case -NFS4ERR_EXPIRED:
5522 return true;
5523 }
5524 return false;
5525 }
5526
nfs4_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5527 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5528 {
5529 struct nfs_server *server = NFS_SERVER(hdr->inode);
5530
5531 trace_nfs4_read(hdr, task->tk_status);
5532 if (task->tk_status < 0) {
5533 struct nfs4_exception exception = {
5534 .inode = hdr->inode,
5535 .state = hdr->args.context->state,
5536 .stateid = &hdr->args.stateid,
5537 };
5538 task->tk_status = nfs4_async_handle_exception(task,
5539 server, task->tk_status, &exception);
5540 if (exception.retry) {
5541 rpc_restart_call_prepare(task);
5542 return -EAGAIN;
5543 }
5544 }
5545
5546 if (task->tk_status > 0)
5547 renew_lease(server, hdr->timestamp);
5548 return 0;
5549 }
5550
nfs4_read_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5551 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5552 struct nfs_pgio_args *args)
5553 {
5554
5555 if (!nfs4_error_stateid_expired(task->tk_status) ||
5556 nfs4_stateid_is_current(&args->stateid,
5557 args->context,
5558 args->lock_context,
5559 FMODE_READ))
5560 return false;
5561 rpc_restart_call_prepare(task);
5562 return true;
5563 }
5564
nfs4_read_plus_not_supported(struct rpc_task * task,struct nfs_pgio_header * hdr)5565 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5566 struct nfs_pgio_header *hdr)
5567 {
5568 struct nfs_server *server = NFS_SERVER(hdr->inode);
5569 struct rpc_message *msg = &task->tk_msg;
5570
5571 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5572 task->tk_status == -ENOTSUPP) {
5573 server->caps &= ~NFS_CAP_READ_PLUS;
5574 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5575 rpc_restart_call_prepare(task);
5576 return true;
5577 }
5578 return false;
5579 }
5580
nfs4_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5581 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5582 {
5583 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5584 return -EAGAIN;
5585 if (nfs4_read_stateid_changed(task, &hdr->args))
5586 return -EAGAIN;
5587 if (nfs4_read_plus_not_supported(task, hdr))
5588 return -EAGAIN;
5589 if (task->tk_status > 0)
5590 nfs_invalidate_atime(hdr->inode);
5591 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5592 nfs4_read_done_cb(task, hdr);
5593 }
5594
5595 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5596 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5597 struct rpc_message *msg)
5598 {
5599 /* Note: We don't use READ_PLUS with pNFS yet */
5600 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5601 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5602 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5603 }
5604 return false;
5605 }
5606 #else
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5607 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5608 struct rpc_message *msg)
5609 {
5610 return false;
5611 }
5612 #endif /* CONFIG_NFS_V4_2 */
5613
nfs4_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)5614 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5615 struct rpc_message *msg)
5616 {
5617 hdr->timestamp = jiffies;
5618 if (!hdr->pgio_done_cb)
5619 hdr->pgio_done_cb = nfs4_read_done_cb;
5620 if (!nfs42_read_plus_support(hdr, msg))
5621 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5622 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5623 }
5624
nfs4_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)5625 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5626 struct nfs_pgio_header *hdr)
5627 {
5628 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5629 &hdr->args.seq_args,
5630 &hdr->res.seq_res,
5631 task))
5632 return 0;
5633 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5634 hdr->args.lock_context,
5635 hdr->rw_mode) == -EIO)
5636 return -EIO;
5637 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5638 return -EIO;
5639 return 0;
5640 }
5641
nfs4_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5642 static int nfs4_write_done_cb(struct rpc_task *task,
5643 struct nfs_pgio_header *hdr)
5644 {
5645 struct inode *inode = hdr->inode;
5646
5647 trace_nfs4_write(hdr, task->tk_status);
5648 if (task->tk_status < 0) {
5649 struct nfs4_exception exception = {
5650 .inode = hdr->inode,
5651 .state = hdr->args.context->state,
5652 .stateid = &hdr->args.stateid,
5653 };
5654 task->tk_status = nfs4_async_handle_exception(task,
5655 NFS_SERVER(inode), task->tk_status,
5656 &exception);
5657 if (exception.retry) {
5658 rpc_restart_call_prepare(task);
5659 return -EAGAIN;
5660 }
5661 }
5662 if (task->tk_status >= 0) {
5663 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5664 nfs_writeback_update_inode(hdr);
5665 }
5666 return 0;
5667 }
5668
nfs4_write_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5669 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5670 struct nfs_pgio_args *args)
5671 {
5672
5673 if (!nfs4_error_stateid_expired(task->tk_status) ||
5674 nfs4_stateid_is_current(&args->stateid,
5675 args->context,
5676 args->lock_context,
5677 FMODE_WRITE))
5678 return false;
5679 rpc_restart_call_prepare(task);
5680 return true;
5681 }
5682
nfs4_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5683 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5684 {
5685 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5686 return -EAGAIN;
5687 if (nfs4_write_stateid_changed(task, &hdr->args))
5688 return -EAGAIN;
5689 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5690 nfs4_write_done_cb(task, hdr);
5691 }
5692
5693 static
nfs4_write_need_cache_consistency_data(struct nfs_pgio_header * hdr)5694 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5695 {
5696 /* Don't request attributes for pNFS or O_DIRECT writes */
5697 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5698 return false;
5699 /* Otherwise, request attributes if and only if we don't hold
5700 * a delegation
5701 */
5702 return nfs4_have_delegation(hdr->inode, FMODE_READ, 0) == 0;
5703 }
5704
nfs4_bitmask_set(__u32 bitmask[],const __u32 src[],struct inode * inode,unsigned long cache_validity)5705 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5706 struct inode *inode, unsigned long cache_validity)
5707 {
5708 struct nfs_server *server = NFS_SERVER(inode);
5709 unsigned int i;
5710
5711 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5712 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5713
5714 if (cache_validity & NFS_INO_INVALID_CHANGE)
5715 bitmask[0] |= FATTR4_WORD0_CHANGE;
5716 if (cache_validity & NFS_INO_INVALID_ATIME)
5717 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5718 if (cache_validity & NFS_INO_INVALID_MODE)
5719 bitmask[1] |= FATTR4_WORD1_MODE;
5720 if (cache_validity & NFS_INO_INVALID_OTHER)
5721 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5722 if (cache_validity & NFS_INO_INVALID_NLINK)
5723 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5724 if (cache_validity & NFS_INO_INVALID_CTIME)
5725 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5726 if (cache_validity & NFS_INO_INVALID_MTIME)
5727 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5728 if (cache_validity & NFS_INO_INVALID_BLOCKS)
5729 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5730
5731 if (cache_validity & NFS_INO_INVALID_SIZE)
5732 bitmask[0] |= FATTR4_WORD0_SIZE;
5733
5734 for (i = 0; i < NFS4_BITMASK_SZ; i++)
5735 bitmask[i] &= server->attr_bitmask[i];
5736 }
5737
nfs4_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)5738 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5739 struct rpc_message *msg,
5740 struct rpc_clnt **clnt)
5741 {
5742 struct nfs_server *server = NFS_SERVER(hdr->inode);
5743
5744 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5745 hdr->args.bitmask = NULL;
5746 hdr->res.fattr = NULL;
5747 } else {
5748 nfs4_bitmask_set(hdr->args.bitmask_store,
5749 server->cache_consistency_bitmask,
5750 hdr->inode, NFS_INO_INVALID_BLOCKS);
5751 hdr->args.bitmask = hdr->args.bitmask_store;
5752 }
5753
5754 if (!hdr->pgio_done_cb)
5755 hdr->pgio_done_cb = nfs4_write_done_cb;
5756 hdr->res.server = server;
5757 hdr->timestamp = jiffies;
5758
5759 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5760 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5761 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5762 }
5763
nfs4_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)5764 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5765 {
5766 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5767 &data->args.seq_args,
5768 &data->res.seq_res,
5769 task);
5770 }
5771
nfs4_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)5772 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5773 {
5774 struct inode *inode = data->inode;
5775
5776 trace_nfs4_commit(data, task->tk_status);
5777 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5778 NULL, NULL) == -EAGAIN) {
5779 rpc_restart_call_prepare(task);
5780 return -EAGAIN;
5781 }
5782 return 0;
5783 }
5784
nfs4_commit_done(struct rpc_task * task,struct nfs_commit_data * data)5785 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5786 {
5787 if (!nfs4_sequence_done(task, &data->res.seq_res))
5788 return -EAGAIN;
5789 return data->commit_done_cb(task, data);
5790 }
5791
nfs4_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)5792 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5793 struct rpc_clnt **clnt)
5794 {
5795 struct nfs_server *server = NFS_SERVER(data->inode);
5796
5797 if (data->commit_done_cb == NULL)
5798 data->commit_done_cb = nfs4_commit_done_cb;
5799 data->res.server = server;
5800 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5801 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5802 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5803 NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5804 }
5805
_nfs4_proc_commit(struct file * dst,struct nfs_commitargs * args,struct nfs_commitres * res)5806 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5807 struct nfs_commitres *res)
5808 {
5809 struct inode *dst_inode = file_inode(dst);
5810 struct nfs_server *server = NFS_SERVER(dst_inode);
5811 struct rpc_message msg = {
5812 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5813 .rpc_argp = args,
5814 .rpc_resp = res,
5815 };
5816
5817 args->fh = NFS_FH(dst_inode);
5818 return nfs4_call_sync(server->client, server, &msg,
5819 &args->seq_args, &res->seq_res, 1);
5820 }
5821
nfs4_proc_commit(struct file * dst,__u64 offset,__u32 count,struct nfs_commitres * res)5822 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5823 {
5824 struct nfs_commitargs args = {
5825 .offset = offset,
5826 .count = count,
5827 };
5828 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5829 struct nfs4_exception exception = { };
5830 int status;
5831
5832 do {
5833 status = _nfs4_proc_commit(dst, &args, res);
5834 status = nfs4_handle_exception(dst_server, status, &exception);
5835 } while (exception.retry);
5836
5837 return status;
5838 }
5839
5840 struct nfs4_renewdata {
5841 struct nfs_client *client;
5842 unsigned long timestamp;
5843 };
5844
5845 /*
5846 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5847 * standalone procedure for queueing an asynchronous RENEW.
5848 */
nfs4_renew_release(void * calldata)5849 static void nfs4_renew_release(void *calldata)
5850 {
5851 struct nfs4_renewdata *data = calldata;
5852 struct nfs_client *clp = data->client;
5853
5854 if (refcount_read(&clp->cl_count) > 1)
5855 nfs4_schedule_state_renewal(clp);
5856 nfs_put_client(clp);
5857 kfree(data);
5858 }
5859
nfs4_renew_done(struct rpc_task * task,void * calldata)5860 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5861 {
5862 struct nfs4_renewdata *data = calldata;
5863 struct nfs_client *clp = data->client;
5864 unsigned long timestamp = data->timestamp;
5865
5866 trace_nfs4_renew_async(clp, task->tk_status);
5867 switch (task->tk_status) {
5868 case 0:
5869 break;
5870 case -NFS4ERR_LEASE_MOVED:
5871 nfs4_schedule_lease_moved_recovery(clp);
5872 break;
5873 default:
5874 /* Unless we're shutting down, schedule state recovery! */
5875 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5876 return;
5877 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5878 nfs4_schedule_lease_recovery(clp);
5879 return;
5880 }
5881 nfs4_schedule_path_down_recovery(clp);
5882 }
5883 do_renew_lease(clp, timestamp);
5884 }
5885
5886 static const struct rpc_call_ops nfs4_renew_ops = {
5887 .rpc_call_done = nfs4_renew_done,
5888 .rpc_release = nfs4_renew_release,
5889 };
5890
nfs4_proc_async_renew(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)5891 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5892 {
5893 struct rpc_message msg = {
5894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5895 .rpc_argp = clp,
5896 .rpc_cred = cred,
5897 };
5898 struct nfs4_renewdata *data;
5899
5900 if (renew_flags == 0)
5901 return 0;
5902 if (!refcount_inc_not_zero(&clp->cl_count))
5903 return -EIO;
5904 data = kmalloc(sizeof(*data), GFP_NOFS);
5905 if (data == NULL) {
5906 nfs_put_client(clp);
5907 return -ENOMEM;
5908 }
5909 data->client = clp;
5910 data->timestamp = jiffies;
5911 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5912 &nfs4_renew_ops, data);
5913 }
5914
nfs4_proc_renew(struct nfs_client * clp,const struct cred * cred)5915 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5916 {
5917 struct rpc_message msg = {
5918 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5919 .rpc_argp = clp,
5920 .rpc_cred = cred,
5921 };
5922 unsigned long now = jiffies;
5923 int status;
5924
5925 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5926 if (status < 0)
5927 return status;
5928 do_renew_lease(clp, now);
5929 return 0;
5930 }
5931
nfs4_server_supports_acls(const struct nfs_server * server,enum nfs4_acl_type type)5932 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5933 enum nfs4_acl_type type)
5934 {
5935 switch (type) {
5936 default:
5937 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5938 case NFS4ACL_DACL:
5939 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5940 case NFS4ACL_SACL:
5941 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5942 }
5943 }
5944
5945 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5946 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5947 * the stack.
5948 */
5949 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5950
nfs4_buf_to_pages_noslab(const void * buf,size_t buflen,struct page ** pages)5951 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5952 struct page **pages)
5953 {
5954 struct page *newpage, **spages;
5955 int rc = 0;
5956 size_t len;
5957 spages = pages;
5958
5959 do {
5960 len = min_t(size_t, PAGE_SIZE, buflen);
5961 newpage = alloc_page(GFP_KERNEL);
5962
5963 if (newpage == NULL)
5964 goto unwind;
5965 memcpy(page_address(newpage), buf, len);
5966 buf += len;
5967 buflen -= len;
5968 *pages++ = newpage;
5969 rc++;
5970 } while (buflen != 0);
5971
5972 return rc;
5973
5974 unwind:
5975 for(; rc > 0; rc--)
5976 __free_page(spages[rc-1]);
5977 return -ENOMEM;
5978 }
5979
5980 struct nfs4_cached_acl {
5981 enum nfs4_acl_type type;
5982 int cached;
5983 size_t len;
5984 char data[];
5985 };
5986
nfs4_set_cached_acl(struct inode * inode,struct nfs4_cached_acl * acl)5987 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5988 {
5989 struct nfs_inode *nfsi = NFS_I(inode);
5990
5991 spin_lock(&inode->i_lock);
5992 kfree(nfsi->nfs4_acl);
5993 nfsi->nfs4_acl = acl;
5994 spin_unlock(&inode->i_lock);
5995 }
5996
nfs4_zap_acl_attr(struct inode * inode)5997 static void nfs4_zap_acl_attr(struct inode *inode)
5998 {
5999 nfs4_set_cached_acl(inode, NULL);
6000 }
6001
nfs4_read_cached_acl(struct inode * inode,char * buf,size_t buflen,enum nfs4_acl_type type)6002 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
6003 size_t buflen, enum nfs4_acl_type type)
6004 {
6005 struct nfs_inode *nfsi = NFS_I(inode);
6006 struct nfs4_cached_acl *acl;
6007 int ret = -ENOENT;
6008
6009 spin_lock(&inode->i_lock);
6010 acl = nfsi->nfs4_acl;
6011 if (acl == NULL)
6012 goto out;
6013 if (acl->type != type)
6014 goto out;
6015 if (buf == NULL) /* user is just asking for length */
6016 goto out_len;
6017 if (acl->cached == 0)
6018 goto out;
6019 ret = -ERANGE; /* see getxattr(2) man page */
6020 if (acl->len > buflen)
6021 goto out;
6022 memcpy(buf, acl->data, acl->len);
6023 out_len:
6024 ret = acl->len;
6025 out:
6026 spin_unlock(&inode->i_lock);
6027 return ret;
6028 }
6029
nfs4_write_cached_acl(struct inode * inode,struct page ** pages,size_t pgbase,size_t acl_len,enum nfs4_acl_type type)6030 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
6031 size_t pgbase, size_t acl_len,
6032 enum nfs4_acl_type type)
6033 {
6034 struct nfs4_cached_acl *acl;
6035 size_t buflen = sizeof(*acl) + acl_len;
6036
6037 if (buflen <= PAGE_SIZE) {
6038 acl = kmalloc(buflen, GFP_KERNEL);
6039 if (acl == NULL)
6040 goto out;
6041 acl->cached = 1;
6042 _copy_from_pages(acl->data, pages, pgbase, acl_len);
6043 } else {
6044 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
6045 if (acl == NULL)
6046 goto out;
6047 acl->cached = 0;
6048 }
6049 acl->type = type;
6050 acl->len = acl_len;
6051 out:
6052 nfs4_set_cached_acl(inode, acl);
6053 }
6054
6055 /*
6056 * The getxattr API returns the required buffer length when called with a
6057 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
6058 * the required buf. On a NULL buf, we send a page of data to the server
6059 * guessing that the ACL request can be serviced by a page. If so, we cache
6060 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
6061 * the cache. If not so, we throw away the page, and cache the required
6062 * length. The next getxattr call will then produce another round trip to
6063 * the server, this time with the input buf of the required size.
6064 */
__nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6065 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
6066 size_t buflen, enum nfs4_acl_type type)
6067 {
6068 struct page **pages;
6069 struct nfs_getaclargs args = {
6070 .fh = NFS_FH(inode),
6071 .acl_type = type,
6072 .acl_len = buflen,
6073 };
6074 struct nfs_getaclres res = {
6075 .acl_type = type,
6076 .acl_len = buflen,
6077 };
6078 struct rpc_message msg = {
6079 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
6080 .rpc_argp = &args,
6081 .rpc_resp = &res,
6082 };
6083 unsigned int npages;
6084 int ret = -ENOMEM, i;
6085 struct nfs_server *server = NFS_SERVER(inode);
6086
6087 if (buflen == 0)
6088 buflen = server->rsize;
6089
6090 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
6091 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
6092 if (!pages)
6093 return -ENOMEM;
6094
6095 args.acl_pages = pages;
6096
6097 for (i = 0; i < npages; i++) {
6098 pages[i] = alloc_page(GFP_KERNEL);
6099 if (!pages[i])
6100 goto out_free;
6101 }
6102
6103 /* for decoding across pages */
6104 res.acl_scratch = alloc_page(GFP_KERNEL);
6105 if (!res.acl_scratch)
6106 goto out_free;
6107
6108 args.acl_len = npages * PAGE_SIZE;
6109
6110 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
6111 __func__, buf, buflen, npages, args.acl_len);
6112 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6113 &msg, &args.seq_args, &res.seq_res, 0);
6114 if (ret)
6115 goto out_free;
6116
6117 /* Handle the case where the passed-in buffer is too short */
6118 if (res.acl_flags & NFS4_ACL_TRUNC) {
6119 /* Did the user only issue a request for the acl length? */
6120 if (buf == NULL)
6121 goto out_ok;
6122 ret = -ERANGE;
6123 goto out_free;
6124 }
6125 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6126 type);
6127 if (buf) {
6128 if (res.acl_len > buflen) {
6129 ret = -ERANGE;
6130 goto out_free;
6131 }
6132 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6133 }
6134 out_ok:
6135 ret = res.acl_len;
6136 out_free:
6137 while (--i >= 0)
6138 __free_page(pages[i]);
6139 if (res.acl_scratch)
6140 __free_page(res.acl_scratch);
6141 kfree(pages);
6142 return ret;
6143 }
6144
nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6145 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6146 size_t buflen, enum nfs4_acl_type type)
6147 {
6148 struct nfs4_exception exception = {
6149 .interruptible = true,
6150 };
6151 ssize_t ret;
6152 do {
6153 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6154 trace_nfs4_get_acl(inode, ret);
6155 if (ret >= 0)
6156 break;
6157 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6158 } while (exception.retry);
6159 return ret;
6160 }
6161
nfs4_proc_get_acl(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6162 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6163 enum nfs4_acl_type type)
6164 {
6165 struct nfs_server *server = NFS_SERVER(inode);
6166 int ret;
6167
6168 if (!nfs4_server_supports_acls(server, type))
6169 return -EOPNOTSUPP;
6170 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6171 if (ret < 0)
6172 return ret;
6173 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6174 nfs_zap_acl_cache(inode);
6175 ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6176 if (ret != -ENOENT)
6177 /* -ENOENT is returned if there is no ACL or if there is an ACL
6178 * but no cached acl data, just the acl length */
6179 return ret;
6180 return nfs4_get_acl_uncached(inode, buf, buflen, type);
6181 }
6182
__nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6183 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6184 size_t buflen, enum nfs4_acl_type type)
6185 {
6186 struct nfs_server *server = NFS_SERVER(inode);
6187 struct page *pages[NFS4ACL_MAXPAGES];
6188 struct nfs_setaclargs arg = {
6189 .fh = NFS_FH(inode),
6190 .acl_type = type,
6191 .acl_len = buflen,
6192 .acl_pages = pages,
6193 };
6194 struct nfs_setaclres res;
6195 struct rpc_message msg = {
6196 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6197 .rpc_argp = &arg,
6198 .rpc_resp = &res,
6199 };
6200 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6201 int ret, i;
6202
6203 /* You can't remove system.nfs4_acl: */
6204 if (buflen == 0)
6205 return -EINVAL;
6206 if (!nfs4_server_supports_acls(server, type))
6207 return -EOPNOTSUPP;
6208 if (npages > ARRAY_SIZE(pages))
6209 return -ERANGE;
6210 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6211 if (i < 0)
6212 return i;
6213 nfs4_inode_make_writeable(inode);
6214 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6215
6216 /*
6217 * Free each page after tx, so the only ref left is
6218 * held by the network stack
6219 */
6220 for (; i > 0; i--)
6221 put_page(pages[i-1]);
6222
6223 /*
6224 * Acl update can result in inode attribute update.
6225 * so mark the attribute cache invalid.
6226 */
6227 spin_lock(&inode->i_lock);
6228 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6229 NFS_INO_INVALID_CTIME |
6230 NFS_INO_REVAL_FORCED);
6231 spin_unlock(&inode->i_lock);
6232 nfs_access_zap_cache(inode);
6233 nfs_zap_acl_cache(inode);
6234 return ret;
6235 }
6236
nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6237 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6238 size_t buflen, enum nfs4_acl_type type)
6239 {
6240 struct nfs4_exception exception = { };
6241 int err;
6242 do {
6243 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6244 trace_nfs4_set_acl(inode, err);
6245 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6246 /*
6247 * no need to retry since the kernel
6248 * isn't involved in encoding the ACEs.
6249 */
6250 err = -EINVAL;
6251 break;
6252 }
6253 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6254 &exception);
6255 } while (exception.retry);
6256 return err;
6257 }
6258
6259 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
_nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6260 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6261 size_t buflen)
6262 {
6263 struct nfs_server *server = NFS_SERVER(inode);
6264 struct nfs4_label label = {0, 0, buflen, buf};
6265
6266 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6267 struct nfs_fattr fattr = {
6268 .label = &label,
6269 };
6270 struct nfs4_getattr_arg arg = {
6271 .fh = NFS_FH(inode),
6272 .bitmask = bitmask,
6273 };
6274 struct nfs4_getattr_res res = {
6275 .fattr = &fattr,
6276 .server = server,
6277 };
6278 struct rpc_message msg = {
6279 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6280 .rpc_argp = &arg,
6281 .rpc_resp = &res,
6282 };
6283 int ret;
6284
6285 nfs_fattr_init(&fattr);
6286
6287 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6288 if (ret)
6289 return ret;
6290 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6291 return -ENOENT;
6292 return label.len;
6293 }
6294
nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6295 static int nfs4_get_security_label(struct inode *inode, void *buf,
6296 size_t buflen)
6297 {
6298 struct nfs4_exception exception = {
6299 .interruptible = true,
6300 };
6301 int err;
6302
6303 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6304 return -EOPNOTSUPP;
6305
6306 do {
6307 err = _nfs4_get_security_label(inode, buf, buflen);
6308 trace_nfs4_get_security_label(inode, err);
6309 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6310 &exception);
6311 } while (exception.retry);
6312 return err;
6313 }
6314
_nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6315 static int _nfs4_do_set_security_label(struct inode *inode,
6316 struct nfs4_label *ilabel,
6317 struct nfs_fattr *fattr)
6318 {
6319
6320 struct iattr sattr = {0};
6321 struct nfs_server *server = NFS_SERVER(inode);
6322 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6323 struct nfs_setattrargs arg = {
6324 .fh = NFS_FH(inode),
6325 .iap = &sattr,
6326 .server = server,
6327 .bitmask = bitmask,
6328 .label = ilabel,
6329 };
6330 struct nfs_setattrres res = {
6331 .fattr = fattr,
6332 .server = server,
6333 };
6334 struct rpc_message msg = {
6335 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6336 .rpc_argp = &arg,
6337 .rpc_resp = &res,
6338 };
6339 int status;
6340
6341 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6342
6343 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6344 if (status)
6345 dprintk("%s failed: %d\n", __func__, status);
6346
6347 return status;
6348 }
6349
nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6350 static int nfs4_do_set_security_label(struct inode *inode,
6351 struct nfs4_label *ilabel,
6352 struct nfs_fattr *fattr)
6353 {
6354 struct nfs4_exception exception = { };
6355 int err;
6356
6357 do {
6358 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6359 trace_nfs4_set_security_label(inode, err);
6360 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6361 &exception);
6362 } while (exception.retry);
6363 return err;
6364 }
6365
6366 static int
nfs4_set_security_label(struct inode * inode,const void * buf,size_t buflen)6367 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6368 {
6369 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6370 struct nfs_fattr *fattr;
6371 int status;
6372
6373 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6374 return -EOPNOTSUPP;
6375
6376 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6377 if (fattr == NULL)
6378 return -ENOMEM;
6379
6380 status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6381 if (status == 0)
6382 nfs_setsecurity(inode, fattr);
6383
6384 nfs_free_fattr(fattr);
6385 return status;
6386 }
6387 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
6388
6389
nfs4_init_boot_verifier(const struct nfs_client * clp,nfs4_verifier * bootverf)6390 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6391 nfs4_verifier *bootverf)
6392 {
6393 __be32 verf[2];
6394
6395 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6396 /* An impossible timestamp guarantees this value
6397 * will never match a generated boot time. */
6398 verf[0] = cpu_to_be32(U32_MAX);
6399 verf[1] = cpu_to_be32(U32_MAX);
6400 } else {
6401 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6402 u64 ns = ktime_to_ns(nn->boot_time);
6403
6404 verf[0] = cpu_to_be32(ns >> 32);
6405 verf[1] = cpu_to_be32(ns);
6406 }
6407 memcpy(bootverf->data, verf, sizeof(bootverf->data));
6408 }
6409
6410 static size_t
nfs4_get_uniquifier(struct nfs_client * clp,char * buf,size_t buflen)6411 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6412 {
6413 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6414 struct nfs_netns_client *nn_clp = nn->nfs_client;
6415 const char *id;
6416
6417 buf[0] = '\0';
6418
6419 if (nn_clp) {
6420 rcu_read_lock();
6421 id = rcu_dereference(nn_clp->identifier);
6422 if (id)
6423 strscpy(buf, id, buflen);
6424 rcu_read_unlock();
6425 }
6426
6427 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6428 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6429
6430 return strlen(buf);
6431 }
6432
6433 static int
nfs4_init_nonuniform_client_string(struct nfs_client * clp)6434 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6435 {
6436 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6437 size_t buflen;
6438 size_t len;
6439 char *str;
6440
6441 if (clp->cl_owner_id != NULL)
6442 return 0;
6443
6444 rcu_read_lock();
6445 len = 14 +
6446 strlen(clp->cl_rpcclient->cl_nodename) +
6447 1 +
6448 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6449 1;
6450 rcu_read_unlock();
6451
6452 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6453 if (buflen)
6454 len += buflen + 1;
6455
6456 if (len > NFS4_OPAQUE_LIMIT + 1)
6457 return -EINVAL;
6458
6459 /*
6460 * Since this string is allocated at mount time, and held until the
6461 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6462 * about a memory-reclaim deadlock.
6463 */
6464 str = kmalloc(len, GFP_KERNEL);
6465 if (!str)
6466 return -ENOMEM;
6467
6468 rcu_read_lock();
6469 if (buflen)
6470 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6471 clp->cl_rpcclient->cl_nodename, buf,
6472 rpc_peeraddr2str(clp->cl_rpcclient,
6473 RPC_DISPLAY_ADDR));
6474 else
6475 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6476 clp->cl_rpcclient->cl_nodename,
6477 rpc_peeraddr2str(clp->cl_rpcclient,
6478 RPC_DISPLAY_ADDR));
6479 rcu_read_unlock();
6480
6481 clp->cl_owner_id = str;
6482 return 0;
6483 }
6484
6485 static int
nfs4_init_uniform_client_string(struct nfs_client * clp)6486 nfs4_init_uniform_client_string(struct nfs_client *clp)
6487 {
6488 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6489 size_t buflen;
6490 size_t len;
6491 char *str;
6492
6493 if (clp->cl_owner_id != NULL)
6494 return 0;
6495
6496 len = 10 + 10 + 1 + 10 + 1 +
6497 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6498
6499 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6500 if (buflen)
6501 len += buflen + 1;
6502
6503 if (len > NFS4_OPAQUE_LIMIT + 1)
6504 return -EINVAL;
6505
6506 /*
6507 * Since this string is allocated at mount time, and held until the
6508 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6509 * about a memory-reclaim deadlock.
6510 */
6511 str = kmalloc(len, GFP_KERNEL);
6512 if (!str)
6513 return -ENOMEM;
6514
6515 if (buflen)
6516 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6517 clp->rpc_ops->version, clp->cl_minorversion,
6518 buf, clp->cl_rpcclient->cl_nodename);
6519 else
6520 scnprintf(str, len, "Linux NFSv%u.%u %s",
6521 clp->rpc_ops->version, clp->cl_minorversion,
6522 clp->cl_rpcclient->cl_nodename);
6523 clp->cl_owner_id = str;
6524 return 0;
6525 }
6526
6527 /*
6528 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6529 * services. Advertise one based on the address family of the
6530 * clientaddr.
6531 */
6532 static unsigned int
nfs4_init_callback_netid(const struct nfs_client * clp,char * buf,size_t len)6533 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6534 {
6535 if (strchr(clp->cl_ipaddr, ':') != NULL)
6536 return scnprintf(buf, len, "tcp6");
6537 else
6538 return scnprintf(buf, len, "tcp");
6539 }
6540
nfs4_setclientid_done(struct rpc_task * task,void * calldata)6541 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6542 {
6543 struct nfs4_setclientid *sc = calldata;
6544
6545 if (task->tk_status == 0)
6546 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6547 }
6548
6549 static const struct rpc_call_ops nfs4_setclientid_ops = {
6550 .rpc_call_done = nfs4_setclientid_done,
6551 };
6552
6553 /**
6554 * nfs4_proc_setclientid - Negotiate client ID
6555 * @clp: state data structure
6556 * @program: RPC program for NFSv4 callback service
6557 * @port: IP port number for NFS4 callback service
6558 * @cred: credential to use for this call
6559 * @res: where to place the result
6560 *
6561 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6562 */
nfs4_proc_setclientid(struct nfs_client * clp,u32 program,unsigned short port,const struct cred * cred,struct nfs4_setclientid_res * res)6563 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6564 unsigned short port, const struct cred *cred,
6565 struct nfs4_setclientid_res *res)
6566 {
6567 nfs4_verifier sc_verifier;
6568 struct nfs4_setclientid setclientid = {
6569 .sc_verifier = &sc_verifier,
6570 .sc_prog = program,
6571 .sc_clnt = clp,
6572 };
6573 struct rpc_message msg = {
6574 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6575 .rpc_argp = &setclientid,
6576 .rpc_resp = res,
6577 .rpc_cred = cred,
6578 };
6579 struct rpc_task_setup task_setup_data = {
6580 .rpc_client = clp->cl_rpcclient,
6581 .rpc_message = &msg,
6582 .callback_ops = &nfs4_setclientid_ops,
6583 .callback_data = &setclientid,
6584 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6585 };
6586 unsigned long now = jiffies;
6587 int status;
6588
6589 /* nfs_client_id4 */
6590 nfs4_init_boot_verifier(clp, &sc_verifier);
6591
6592 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6593 status = nfs4_init_uniform_client_string(clp);
6594 else
6595 status = nfs4_init_nonuniform_client_string(clp);
6596
6597 if (status)
6598 goto out;
6599
6600 /* cb_client4 */
6601 setclientid.sc_netid_len =
6602 nfs4_init_callback_netid(clp,
6603 setclientid.sc_netid,
6604 sizeof(setclientid.sc_netid));
6605 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6606 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6607 clp->cl_ipaddr, port >> 8, port & 255);
6608
6609 dprintk("NFS call setclientid auth=%s, '%s'\n",
6610 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6611 clp->cl_owner_id);
6612
6613 status = nfs4_call_sync_custom(&task_setup_data);
6614 if (setclientid.sc_cred) {
6615 kfree(clp->cl_acceptor);
6616 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6617 put_rpccred(setclientid.sc_cred);
6618 }
6619
6620 if (status == 0)
6621 do_renew_lease(clp, now);
6622 out:
6623 trace_nfs4_setclientid(clp, status);
6624 dprintk("NFS reply setclientid: %d\n", status);
6625 return status;
6626 }
6627
6628 /**
6629 * nfs4_proc_setclientid_confirm - Confirm client ID
6630 * @clp: state data structure
6631 * @arg: result of a previous SETCLIENTID
6632 * @cred: credential to use for this call
6633 *
6634 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6635 */
nfs4_proc_setclientid_confirm(struct nfs_client * clp,struct nfs4_setclientid_res * arg,const struct cred * cred)6636 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6637 struct nfs4_setclientid_res *arg,
6638 const struct cred *cred)
6639 {
6640 struct rpc_message msg = {
6641 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6642 .rpc_argp = arg,
6643 .rpc_cred = cred,
6644 };
6645 int status;
6646
6647 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
6648 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6649 clp->cl_clientid);
6650 status = rpc_call_sync(clp->cl_rpcclient, &msg,
6651 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6652 trace_nfs4_setclientid_confirm(clp, status);
6653 dprintk("NFS reply setclientid_confirm: %d\n", status);
6654 return status;
6655 }
6656
6657 struct nfs4_delegreturndata {
6658 struct nfs4_delegreturnargs args;
6659 struct nfs4_delegreturnres res;
6660 struct nfs_fh fh;
6661 nfs4_stateid stateid;
6662 unsigned long timestamp;
6663 struct {
6664 struct nfs4_layoutreturn_args arg;
6665 struct nfs4_layoutreturn_res res;
6666 struct nfs4_xdr_opaque_data ld_private;
6667 u32 roc_barrier;
6668 bool roc;
6669 } lr;
6670 struct nfs4_delegattr sattr;
6671 struct nfs_fattr fattr;
6672 int rpc_status;
6673 struct inode *inode;
6674 };
6675
nfs4_delegreturn_done(struct rpc_task * task,void * calldata)6676 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6677 {
6678 struct nfs4_delegreturndata *data = calldata;
6679 struct nfs4_exception exception = {
6680 .inode = data->inode,
6681 .stateid = &data->stateid,
6682 .task_is_privileged = data->args.seq_args.sa_privileged,
6683 };
6684
6685 if (!nfs4_sequence_done(task, &data->res.seq_res))
6686 return;
6687
6688 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6689
6690 /* Handle Layoutreturn errors */
6691 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6692 &data->res.lr_ret) == -EAGAIN)
6693 goto out_restart;
6694
6695 if (data->args.sattr_args && task->tk_status != 0) {
6696 switch(data->res.sattr_ret) {
6697 case 0:
6698 data->args.sattr_args = NULL;
6699 data->res.sattr_res = false;
6700 break;
6701 case -NFS4ERR_ADMIN_REVOKED:
6702 case -NFS4ERR_DELEG_REVOKED:
6703 case -NFS4ERR_EXPIRED:
6704 case -NFS4ERR_BAD_STATEID:
6705 /* Let the main handler below do stateid recovery */
6706 break;
6707 case -NFS4ERR_OLD_STATEID:
6708 if (nfs4_refresh_delegation_stateid(&data->stateid,
6709 data->inode))
6710 goto out_restart;
6711 fallthrough;
6712 default:
6713 data->args.sattr_args = NULL;
6714 data->res.sattr_res = false;
6715 goto out_restart;
6716 }
6717 }
6718
6719 switch (task->tk_status) {
6720 case 0:
6721 renew_lease(data->res.server, data->timestamp);
6722 break;
6723 case -NFS4ERR_ADMIN_REVOKED:
6724 case -NFS4ERR_DELEG_REVOKED:
6725 case -NFS4ERR_EXPIRED:
6726 nfs4_free_revoked_stateid(data->res.server,
6727 data->args.stateid,
6728 task->tk_msg.rpc_cred);
6729 fallthrough;
6730 case -NFS4ERR_BAD_STATEID:
6731 case -NFS4ERR_STALE_STATEID:
6732 case -ETIMEDOUT:
6733 task->tk_status = 0;
6734 break;
6735 case -NFS4ERR_OLD_STATEID:
6736 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6737 nfs4_stateid_seqid_inc(&data->stateid);
6738 if (data->args.bitmask) {
6739 data->args.bitmask = NULL;
6740 data->res.fattr = NULL;
6741 }
6742 goto out_restart;
6743 case -NFS4ERR_ACCESS:
6744 if (data->args.bitmask) {
6745 data->args.bitmask = NULL;
6746 data->res.fattr = NULL;
6747 goto out_restart;
6748 }
6749 fallthrough;
6750 default:
6751 task->tk_status = nfs4_async_handle_exception(task,
6752 data->res.server, task->tk_status,
6753 &exception);
6754 if (exception.retry)
6755 goto out_restart;
6756 }
6757 nfs_delegation_mark_returned(data->inode, data->args.stateid);
6758 data->rpc_status = task->tk_status;
6759 return;
6760 out_restart:
6761 task->tk_status = 0;
6762 rpc_restart_call_prepare(task);
6763 }
6764
nfs4_delegreturn_release(void * calldata)6765 static void nfs4_delegreturn_release(void *calldata)
6766 {
6767 struct nfs4_delegreturndata *data = calldata;
6768 struct inode *inode = data->inode;
6769
6770 if (data->lr.roc)
6771 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6772 data->res.lr_ret);
6773 if (inode) {
6774 nfs4_fattr_set_prechange(&data->fattr,
6775 inode_peek_iversion_raw(inode));
6776 nfs_refresh_inode(inode, &data->fattr);
6777 nfs_iput_and_deactive(inode);
6778 }
6779 kfree(calldata);
6780 }
6781
nfs4_delegreturn_prepare(struct rpc_task * task,void * data)6782 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6783 {
6784 struct nfs4_delegreturndata *d_data;
6785 struct pnfs_layout_hdr *lo;
6786
6787 d_data = data;
6788
6789 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6790 nfs4_sequence_done(task, &d_data->res.seq_res);
6791 return;
6792 }
6793
6794 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6795 if (lo && !pnfs_layout_is_valid(lo)) {
6796 d_data->args.lr_args = NULL;
6797 d_data->res.lr_res = NULL;
6798 }
6799
6800 nfs4_setup_sequence(d_data->res.server->nfs_client,
6801 &d_data->args.seq_args,
6802 &d_data->res.seq_res,
6803 task);
6804 }
6805
6806 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6807 .rpc_call_prepare = nfs4_delegreturn_prepare,
6808 .rpc_call_done = nfs4_delegreturn_done,
6809 .rpc_release = nfs4_delegreturn_release,
6810 };
6811
_nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6812 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6813 const nfs4_stateid *stateid,
6814 struct nfs_delegation *delegation,
6815 int issync)
6816 {
6817 struct nfs4_delegreturndata *data;
6818 struct nfs_server *server = NFS_SERVER(inode);
6819 struct rpc_task *task;
6820 struct rpc_message msg = {
6821 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6822 .rpc_cred = cred,
6823 };
6824 struct rpc_task_setup task_setup_data = {
6825 .rpc_client = server->client,
6826 .rpc_message = &msg,
6827 .callback_ops = &nfs4_delegreturn_ops,
6828 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6829 };
6830 int status = 0;
6831
6832 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6833 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6834
6835 data = kzalloc(sizeof(*data), GFP_KERNEL);
6836 if (data == NULL)
6837 return -ENOMEM;
6838
6839 nfs4_state_protect(server->nfs_client,
6840 NFS_SP4_MACH_CRED_CLEANUP,
6841 &task_setup_data.rpc_client, &msg);
6842
6843 data->args.fhandle = &data->fh;
6844 data->args.stateid = &data->stateid;
6845 nfs4_bitmask_set(data->args.bitmask_store,
6846 server->cache_consistency_bitmask, inode, 0);
6847 data->args.bitmask = data->args.bitmask_store;
6848 nfs_copy_fh(&data->fh, NFS_FH(inode));
6849 nfs4_stateid_copy(&data->stateid, stateid);
6850 data->res.fattr = &data->fattr;
6851 data->res.server = server;
6852 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6853 data->lr.arg.ld_private = &data->lr.ld_private;
6854 nfs_fattr_init(data->res.fattr);
6855 data->timestamp = jiffies;
6856 data->rpc_status = 0;
6857 data->inode = nfs_igrab_and_active(inode);
6858 if (data->inode || issync) {
6859 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6860 cred);
6861 if (data->lr.roc) {
6862 data->args.lr_args = &data->lr.arg;
6863 data->res.lr_res = &data->lr.res;
6864 }
6865 }
6866
6867 if (delegation &&
6868 test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags)) {
6869 if (delegation->type & FMODE_READ) {
6870 data->sattr.atime = inode_get_atime(inode);
6871 data->sattr.atime_set = true;
6872 }
6873 if (delegation->type & FMODE_WRITE) {
6874 data->sattr.mtime = inode_get_mtime(inode);
6875 data->sattr.mtime_set = true;
6876 }
6877 data->args.sattr_args = &data->sattr;
6878 data->res.sattr_res = true;
6879 }
6880
6881 if (!data->inode)
6882 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6883 1);
6884 else
6885 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6886 0);
6887
6888 task_setup_data.callback_data = data;
6889 msg.rpc_argp = &data->args;
6890 msg.rpc_resp = &data->res;
6891 task = rpc_run_task(&task_setup_data);
6892 if (IS_ERR(task))
6893 return PTR_ERR(task);
6894 if (!issync)
6895 goto out;
6896 status = rpc_wait_for_completion_task(task);
6897 if (status != 0)
6898 goto out;
6899 status = data->rpc_status;
6900 out:
6901 rpc_put_task(task);
6902 return status;
6903 }
6904
nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6905 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6906 const nfs4_stateid *stateid,
6907 struct nfs_delegation *delegation, int issync)
6908 {
6909 struct nfs_server *server = NFS_SERVER(inode);
6910 struct nfs4_exception exception = { };
6911 int err;
6912 do {
6913 err = _nfs4_proc_delegreturn(inode, cred, stateid,
6914 delegation, issync);
6915 trace_nfs4_delegreturn(inode, stateid, err);
6916 switch (err) {
6917 case -NFS4ERR_STALE_STATEID:
6918 case -NFS4ERR_EXPIRED:
6919 case 0:
6920 return 0;
6921 }
6922 err = nfs4_handle_exception(server, err, &exception);
6923 } while (exception.retry);
6924 return err;
6925 }
6926
_nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6927 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6928 {
6929 struct inode *inode = state->inode;
6930 struct nfs_server *server = NFS_SERVER(inode);
6931 struct nfs_client *clp = server->nfs_client;
6932 struct nfs_lockt_args arg = {
6933 .fh = NFS_FH(inode),
6934 .fl = request,
6935 };
6936 struct nfs_lockt_res res = {
6937 .denied = request,
6938 };
6939 struct rpc_message msg = {
6940 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6941 .rpc_argp = &arg,
6942 .rpc_resp = &res,
6943 .rpc_cred = state->owner->so_cred,
6944 };
6945 struct nfs4_lock_state *lsp;
6946 int status;
6947
6948 arg.lock_owner.clientid = clp->cl_clientid;
6949 status = nfs4_set_lock_state(state, request);
6950 if (status != 0)
6951 goto out;
6952 lsp = request->fl_u.nfs4_fl.owner;
6953 arg.lock_owner.id = lsp->ls_seqid.owner_id;
6954 arg.lock_owner.s_dev = server->s_dev;
6955 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6956 switch (status) {
6957 case 0:
6958 request->c.flc_type = F_UNLCK;
6959 break;
6960 case -NFS4ERR_DENIED:
6961 status = 0;
6962 }
6963 request->fl_ops->fl_release_private(request);
6964 request->fl_ops = NULL;
6965 out:
6966 return status;
6967 }
6968
nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6969 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6970 {
6971 struct nfs4_exception exception = {
6972 .interruptible = true,
6973 };
6974 int err;
6975
6976 do {
6977 err = _nfs4_proc_getlk(state, cmd, request);
6978 trace_nfs4_get_lock(request, state, cmd, err);
6979 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6980 &exception);
6981 } while (exception.retry);
6982 return err;
6983 }
6984
6985 /*
6986 * Update the seqid of a lock stateid after receiving
6987 * NFS4ERR_OLD_STATEID
6988 */
nfs4_refresh_lock_old_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6989 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6990 struct nfs4_lock_state *lsp)
6991 {
6992 struct nfs4_state *state = lsp->ls_state;
6993 bool ret = false;
6994
6995 spin_lock(&state->state_lock);
6996 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6997 goto out;
6998 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6999 nfs4_stateid_seqid_inc(dst);
7000 else
7001 dst->seqid = lsp->ls_stateid.seqid;
7002 ret = true;
7003 out:
7004 spin_unlock(&state->state_lock);
7005 return ret;
7006 }
7007
nfs4_sync_lock_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)7008 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
7009 struct nfs4_lock_state *lsp)
7010 {
7011 struct nfs4_state *state = lsp->ls_state;
7012 bool ret;
7013
7014 spin_lock(&state->state_lock);
7015 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
7016 nfs4_stateid_copy(dst, &lsp->ls_stateid);
7017 spin_unlock(&state->state_lock);
7018 return ret;
7019 }
7020
7021 struct nfs4_unlockdata {
7022 struct nfs_locku_args arg;
7023 struct nfs_locku_res res;
7024 struct nfs4_lock_state *lsp;
7025 struct nfs_open_context *ctx;
7026 struct nfs_lock_context *l_ctx;
7027 struct file_lock fl;
7028 struct nfs_server *server;
7029 unsigned long timestamp;
7030 };
7031
nfs4_alloc_unlockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7032 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
7033 struct nfs_open_context *ctx,
7034 struct nfs4_lock_state *lsp,
7035 struct nfs_seqid *seqid)
7036 {
7037 struct nfs4_unlockdata *p;
7038 struct nfs4_state *state = lsp->ls_state;
7039 struct inode *inode = state->inode;
7040
7041 p = kzalloc(sizeof(*p), GFP_KERNEL);
7042 if (p == NULL)
7043 return NULL;
7044 p->arg.fh = NFS_FH(inode);
7045 p->arg.fl = &p->fl;
7046 p->arg.seqid = seqid;
7047 p->res.seqid = seqid;
7048 p->lsp = lsp;
7049 /* Ensure we don't close file until we're done freeing locks! */
7050 p->ctx = get_nfs_open_context(ctx);
7051 p->l_ctx = nfs_get_lock_context(ctx);
7052 locks_init_lock(&p->fl);
7053 locks_copy_lock(&p->fl, fl);
7054 p->server = NFS_SERVER(inode);
7055 spin_lock(&state->state_lock);
7056 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
7057 spin_unlock(&state->state_lock);
7058 return p;
7059 }
7060
nfs4_locku_release_calldata(void * data)7061 static void nfs4_locku_release_calldata(void *data)
7062 {
7063 struct nfs4_unlockdata *calldata = data;
7064 nfs_free_seqid(calldata->arg.seqid);
7065 nfs4_put_lock_state(calldata->lsp);
7066 nfs_put_lock_context(calldata->l_ctx);
7067 put_nfs_open_context(calldata->ctx);
7068 kfree(calldata);
7069 }
7070
nfs4_locku_done(struct rpc_task * task,void * data)7071 static void nfs4_locku_done(struct rpc_task *task, void *data)
7072 {
7073 struct nfs4_unlockdata *calldata = data;
7074 struct nfs4_exception exception = {
7075 .inode = calldata->lsp->ls_state->inode,
7076 .stateid = &calldata->arg.stateid,
7077 };
7078
7079 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
7080 return;
7081 switch (task->tk_status) {
7082 case 0:
7083 renew_lease(calldata->server, calldata->timestamp);
7084 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
7085 if (nfs4_update_lock_stateid(calldata->lsp,
7086 &calldata->res.stateid))
7087 break;
7088 fallthrough;
7089 case -NFS4ERR_ADMIN_REVOKED:
7090 case -NFS4ERR_EXPIRED:
7091 nfs4_free_revoked_stateid(calldata->server,
7092 &calldata->arg.stateid,
7093 task->tk_msg.rpc_cred);
7094 fallthrough;
7095 case -NFS4ERR_BAD_STATEID:
7096 case -NFS4ERR_STALE_STATEID:
7097 if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
7098 calldata->lsp))
7099 rpc_restart_call_prepare(task);
7100 break;
7101 case -NFS4ERR_OLD_STATEID:
7102 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
7103 calldata->lsp))
7104 rpc_restart_call_prepare(task);
7105 break;
7106 default:
7107 task->tk_status = nfs4_async_handle_exception(task,
7108 calldata->server, task->tk_status,
7109 &exception);
7110 if (exception.retry)
7111 rpc_restart_call_prepare(task);
7112 }
7113 nfs_release_seqid(calldata->arg.seqid);
7114 }
7115
nfs4_locku_prepare(struct rpc_task * task,void * data)7116 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
7117 {
7118 struct nfs4_unlockdata *calldata = data;
7119
7120 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
7121 nfs_async_iocounter_wait(task, calldata->l_ctx))
7122 return;
7123
7124 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
7125 goto out_wait;
7126 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
7127 /* Note: exit _without_ running nfs4_locku_done */
7128 goto out_no_action;
7129 }
7130 calldata->timestamp = jiffies;
7131 if (nfs4_setup_sequence(calldata->server->nfs_client,
7132 &calldata->arg.seq_args,
7133 &calldata->res.seq_res,
7134 task) != 0)
7135 nfs_release_seqid(calldata->arg.seqid);
7136 return;
7137 out_no_action:
7138 task->tk_action = NULL;
7139 out_wait:
7140 nfs4_sequence_done(task, &calldata->res.seq_res);
7141 }
7142
7143 static const struct rpc_call_ops nfs4_locku_ops = {
7144 .rpc_call_prepare = nfs4_locku_prepare,
7145 .rpc_call_done = nfs4_locku_done,
7146 .rpc_release = nfs4_locku_release_calldata,
7147 };
7148
nfs4_do_unlck(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7149 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
7150 struct nfs_open_context *ctx,
7151 struct nfs4_lock_state *lsp,
7152 struct nfs_seqid *seqid)
7153 {
7154 struct nfs4_unlockdata *data;
7155 struct rpc_message msg = {
7156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
7157 .rpc_cred = ctx->cred,
7158 };
7159 struct rpc_task_setup task_setup_data = {
7160 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7161 .rpc_message = &msg,
7162 .callback_ops = &nfs4_locku_ops,
7163 .workqueue = nfsiod_workqueue,
7164 .flags = RPC_TASK_ASYNC,
7165 };
7166
7167 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7168 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7169
7170 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
7171 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
7172
7173 /* Ensure this is an unlock - when canceling a lock, the
7174 * canceled lock is passed in, and it won't be an unlock.
7175 */
7176 fl->c.flc_type = F_UNLCK;
7177 if (fl->c.flc_flags & FL_CLOSE)
7178 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7179
7180 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7181 if (data == NULL) {
7182 nfs_free_seqid(seqid);
7183 return ERR_PTR(-ENOMEM);
7184 }
7185
7186 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7187 msg.rpc_argp = &data->arg;
7188 msg.rpc_resp = &data->res;
7189 task_setup_data.callback_data = data;
7190 return rpc_run_task(&task_setup_data);
7191 }
7192
nfs4_proc_unlck(struct nfs4_state * state,int cmd,struct file_lock * request)7193 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7194 {
7195 struct inode *inode = state->inode;
7196 struct nfs4_state_owner *sp = state->owner;
7197 struct nfs_inode *nfsi = NFS_I(inode);
7198 struct nfs_seqid *seqid;
7199 struct nfs4_lock_state *lsp;
7200 struct rpc_task *task;
7201 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7202 int status = 0;
7203 unsigned char saved_flags = request->c.flc_flags;
7204
7205 status = nfs4_set_lock_state(state, request);
7206 /* Unlock _before_ we do the RPC call */
7207 request->c.flc_flags |= FL_EXISTS;
7208 /* Exclude nfs_delegation_claim_locks() */
7209 mutex_lock(&sp->so_delegreturn_mutex);
7210 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7211 down_read(&nfsi->rwsem);
7212 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7213 up_read(&nfsi->rwsem);
7214 mutex_unlock(&sp->so_delegreturn_mutex);
7215 goto out;
7216 }
7217 lsp = request->fl_u.nfs4_fl.owner;
7218 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7219 up_read(&nfsi->rwsem);
7220 mutex_unlock(&sp->so_delegreturn_mutex);
7221 if (status != 0)
7222 goto out;
7223 /* Is this a delegated lock? */
7224 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7225 goto out;
7226 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7227 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7228 status = -ENOMEM;
7229 if (IS_ERR(seqid))
7230 goto out;
7231 task = nfs4_do_unlck(request,
7232 nfs_file_open_context(request->c.flc_file),
7233 lsp, seqid);
7234 status = PTR_ERR(task);
7235 if (IS_ERR(task))
7236 goto out;
7237 status = rpc_wait_for_completion_task(task);
7238 rpc_put_task(task);
7239 out:
7240 request->c.flc_flags = saved_flags;
7241 trace_nfs4_unlock(request, state, F_SETLK, status);
7242 return status;
7243 }
7244
7245 struct nfs4_lockdata {
7246 struct nfs_lock_args arg;
7247 struct nfs_lock_res res;
7248 struct nfs4_lock_state *lsp;
7249 struct nfs_open_context *ctx;
7250 struct file_lock fl;
7251 unsigned long timestamp;
7252 int rpc_status;
7253 int cancelled;
7254 struct nfs_server *server;
7255 };
7256
nfs4_alloc_lockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,gfp_t gfp_mask)7257 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7258 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7259 gfp_t gfp_mask)
7260 {
7261 struct nfs4_lockdata *p;
7262 struct inode *inode = lsp->ls_state->inode;
7263 struct nfs_server *server = NFS_SERVER(inode);
7264 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7265
7266 p = kzalloc(sizeof(*p), gfp_mask);
7267 if (p == NULL)
7268 return NULL;
7269
7270 p->arg.fh = NFS_FH(inode);
7271 p->arg.fl = &p->fl;
7272 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7273 if (IS_ERR(p->arg.open_seqid))
7274 goto out_free;
7275 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7276 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7277 if (IS_ERR(p->arg.lock_seqid))
7278 goto out_free_seqid;
7279 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7280 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7281 p->arg.lock_owner.s_dev = server->s_dev;
7282 p->res.lock_seqid = p->arg.lock_seqid;
7283 p->lsp = lsp;
7284 p->server = server;
7285 p->ctx = get_nfs_open_context(ctx);
7286 locks_init_lock(&p->fl);
7287 locks_copy_lock(&p->fl, fl);
7288 return p;
7289 out_free_seqid:
7290 nfs_free_seqid(p->arg.open_seqid);
7291 out_free:
7292 kfree(p);
7293 return NULL;
7294 }
7295
nfs4_lock_prepare(struct rpc_task * task,void * calldata)7296 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7297 {
7298 struct nfs4_lockdata *data = calldata;
7299 struct nfs4_state *state = data->lsp->ls_state;
7300
7301 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7302 goto out_wait;
7303 /* Do we need to do an open_to_lock_owner? */
7304 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7305 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7306 goto out_release_lock_seqid;
7307 }
7308 nfs4_stateid_copy(&data->arg.open_stateid,
7309 &state->open_stateid);
7310 data->arg.new_lock_owner = 1;
7311 data->res.open_seqid = data->arg.open_seqid;
7312 } else {
7313 data->arg.new_lock_owner = 0;
7314 nfs4_stateid_copy(&data->arg.lock_stateid,
7315 &data->lsp->ls_stateid);
7316 }
7317 if (!nfs4_valid_open_stateid(state)) {
7318 data->rpc_status = -EBADF;
7319 task->tk_action = NULL;
7320 goto out_release_open_seqid;
7321 }
7322 data->timestamp = jiffies;
7323 if (nfs4_setup_sequence(data->server->nfs_client,
7324 &data->arg.seq_args,
7325 &data->res.seq_res,
7326 task) == 0)
7327 return;
7328 out_release_open_seqid:
7329 nfs_release_seqid(data->arg.open_seqid);
7330 out_release_lock_seqid:
7331 nfs_release_seqid(data->arg.lock_seqid);
7332 out_wait:
7333 nfs4_sequence_done(task, &data->res.seq_res);
7334 dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7335 }
7336
nfs4_lock_done(struct rpc_task * task,void * calldata)7337 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7338 {
7339 struct nfs4_lockdata *data = calldata;
7340 struct nfs4_lock_state *lsp = data->lsp;
7341
7342 if (!nfs4_sequence_done(task, &data->res.seq_res))
7343 return;
7344
7345 data->rpc_status = task->tk_status;
7346 switch (task->tk_status) {
7347 case 0:
7348 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7349 data->timestamp);
7350 if (data->arg.new_lock && !data->cancelled) {
7351 data->fl.c.flc_flags &= ~(FL_SLEEP | FL_ACCESS);
7352 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7353 goto out_restart;
7354 }
7355 if (data->arg.new_lock_owner != 0) {
7356 nfs_confirm_seqid(&lsp->ls_seqid, 0);
7357 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7358 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7359 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7360 goto out_restart;
7361 break;
7362 case -NFS4ERR_OLD_STATEID:
7363 if (data->arg.new_lock_owner != 0 &&
7364 nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7365 lsp->ls_state))
7366 goto out_restart;
7367 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7368 goto out_restart;
7369 fallthrough;
7370 case -NFS4ERR_BAD_STATEID:
7371 case -NFS4ERR_STALE_STATEID:
7372 case -NFS4ERR_EXPIRED:
7373 if (data->arg.new_lock_owner != 0) {
7374 if (!nfs4_stateid_match(&data->arg.open_stateid,
7375 &lsp->ls_state->open_stateid))
7376 goto out_restart;
7377 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7378 &lsp->ls_stateid))
7379 goto out_restart;
7380 }
7381 out_done:
7382 dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7383 return;
7384 out_restart:
7385 if (!data->cancelled)
7386 rpc_restart_call_prepare(task);
7387 goto out_done;
7388 }
7389
nfs4_lock_release(void * calldata)7390 static void nfs4_lock_release(void *calldata)
7391 {
7392 struct nfs4_lockdata *data = calldata;
7393
7394 nfs_free_seqid(data->arg.open_seqid);
7395 if (data->cancelled && data->rpc_status == 0) {
7396 struct rpc_task *task;
7397 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7398 data->arg.lock_seqid);
7399 if (!IS_ERR(task))
7400 rpc_put_task_async(task);
7401 dprintk("%s: cancelling lock!\n", __func__);
7402 } else
7403 nfs_free_seqid(data->arg.lock_seqid);
7404 nfs4_put_lock_state(data->lsp);
7405 put_nfs_open_context(data->ctx);
7406 kfree(data);
7407 }
7408
7409 static const struct rpc_call_ops nfs4_lock_ops = {
7410 .rpc_call_prepare = nfs4_lock_prepare,
7411 .rpc_call_done = nfs4_lock_done,
7412 .rpc_release = nfs4_lock_release,
7413 };
7414
nfs4_handle_setlk_error(struct nfs_server * server,struct nfs4_lock_state * lsp,int new_lock_owner,int error)7415 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7416 {
7417 switch (error) {
7418 case -NFS4ERR_ADMIN_REVOKED:
7419 case -NFS4ERR_EXPIRED:
7420 case -NFS4ERR_BAD_STATEID:
7421 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7422 if (new_lock_owner != 0 ||
7423 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7424 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7425 break;
7426 case -NFS4ERR_STALE_STATEID:
7427 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7428 nfs4_schedule_lease_recovery(server->nfs_client);
7429 }
7430 }
7431
_nfs4_do_setlk(struct nfs4_state * state,int cmd,struct file_lock * fl,int recovery_type)7432 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7433 {
7434 struct nfs4_lockdata *data;
7435 struct rpc_task *task;
7436 struct rpc_message msg = {
7437 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7438 .rpc_cred = state->owner->so_cred,
7439 };
7440 struct rpc_task_setup task_setup_data = {
7441 .rpc_client = NFS_CLIENT(state->inode),
7442 .rpc_message = &msg,
7443 .callback_ops = &nfs4_lock_ops,
7444 .workqueue = nfsiod_workqueue,
7445 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7446 };
7447 int ret;
7448
7449 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7450 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7451
7452 data = nfs4_alloc_lockdata(fl,
7453 nfs_file_open_context(fl->c.flc_file),
7454 fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7455 if (data == NULL)
7456 return -ENOMEM;
7457 if (IS_SETLKW(cmd))
7458 data->arg.block = 1;
7459 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7460 recovery_type > NFS_LOCK_NEW);
7461 msg.rpc_argp = &data->arg;
7462 msg.rpc_resp = &data->res;
7463 task_setup_data.callback_data = data;
7464 if (recovery_type > NFS_LOCK_NEW) {
7465 if (recovery_type == NFS_LOCK_RECLAIM)
7466 data->arg.reclaim = NFS_LOCK_RECLAIM;
7467 } else
7468 data->arg.new_lock = 1;
7469 task = rpc_run_task(&task_setup_data);
7470 if (IS_ERR(task))
7471 return PTR_ERR(task);
7472 ret = rpc_wait_for_completion_task(task);
7473 if (ret == 0) {
7474 ret = data->rpc_status;
7475 if (ret)
7476 nfs4_handle_setlk_error(data->server, data->lsp,
7477 data->arg.new_lock_owner, ret);
7478 } else
7479 data->cancelled = true;
7480 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7481 rpc_put_task(task);
7482 dprintk("%s: ret = %d\n", __func__, ret);
7483 return ret;
7484 }
7485
nfs4_lock_reclaim(struct nfs4_state * state,struct file_lock * request)7486 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7487 {
7488 struct nfs_server *server = NFS_SERVER(state->inode);
7489 struct nfs4_exception exception = {
7490 .inode = state->inode,
7491 };
7492 int err;
7493
7494 do {
7495 /* Cache the lock if possible... */
7496 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7497 return 0;
7498 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7499 if (err != -NFS4ERR_DELAY)
7500 break;
7501 nfs4_handle_exception(server, err, &exception);
7502 } while (exception.retry);
7503 return err;
7504 }
7505
nfs4_lock_expired(struct nfs4_state * state,struct file_lock * request)7506 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7507 {
7508 struct nfs_server *server = NFS_SERVER(state->inode);
7509 struct nfs4_exception exception = {
7510 .inode = state->inode,
7511 };
7512 int err;
7513
7514 err = nfs4_set_lock_state(state, request);
7515 if (err != 0)
7516 return err;
7517 if (!recover_lost_locks) {
7518 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7519 return 0;
7520 }
7521 do {
7522 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7523 return 0;
7524 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7525 switch (err) {
7526 default:
7527 goto out;
7528 case -NFS4ERR_GRACE:
7529 case -NFS4ERR_DELAY:
7530 nfs4_handle_exception(server, err, &exception);
7531 err = 0;
7532 }
7533 } while (exception.retry);
7534 out:
7535 return err;
7536 }
7537
7538 #if defined(CONFIG_NFS_V4_1)
nfs41_lock_expired(struct nfs4_state * state,struct file_lock * request)7539 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7540 {
7541 struct nfs4_lock_state *lsp;
7542 int status;
7543
7544 status = nfs4_set_lock_state(state, request);
7545 if (status != 0)
7546 return status;
7547 lsp = request->fl_u.nfs4_fl.owner;
7548 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7549 test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7550 return 0;
7551 return nfs4_lock_expired(state, request);
7552 }
7553 #endif
7554
_nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7555 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7556 {
7557 struct nfs_inode *nfsi = NFS_I(state->inode);
7558 struct nfs4_state_owner *sp = state->owner;
7559 unsigned char flags = request->c.flc_flags;
7560 int status;
7561
7562 request->c.flc_flags |= FL_ACCESS;
7563 status = locks_lock_inode_wait(state->inode, request);
7564 if (status < 0)
7565 goto out;
7566 mutex_lock(&sp->so_delegreturn_mutex);
7567 down_read(&nfsi->rwsem);
7568 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7569 /* Yes: cache locks! */
7570 /* ...but avoid races with delegation recall... */
7571 request->c.flc_flags = flags & ~FL_SLEEP;
7572 status = locks_lock_inode_wait(state->inode, request);
7573 up_read(&nfsi->rwsem);
7574 mutex_unlock(&sp->so_delegreturn_mutex);
7575 goto out;
7576 }
7577 up_read(&nfsi->rwsem);
7578 mutex_unlock(&sp->so_delegreturn_mutex);
7579 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7580 out:
7581 request->c.flc_flags = flags;
7582 return status;
7583 }
7584
nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7585 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7586 {
7587 struct nfs4_exception exception = {
7588 .state = state,
7589 .inode = state->inode,
7590 .interruptible = true,
7591 };
7592 int err;
7593
7594 do {
7595 err = _nfs4_proc_setlk(state, cmd, request);
7596 if (err == -NFS4ERR_DENIED)
7597 err = -EAGAIN;
7598 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7599 err, &exception);
7600 } while (exception.retry);
7601 return err;
7602 }
7603
7604 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7605 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7606
7607 static int
nfs4_retry_setlk_simple(struct nfs4_state * state,int cmd,struct file_lock * request)7608 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7609 struct file_lock *request)
7610 {
7611 int status = -ERESTARTSYS;
7612 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
7613
7614 while(!signalled()) {
7615 status = nfs4_proc_setlk(state, cmd, request);
7616 if ((status != -EAGAIN) || IS_SETLK(cmd))
7617 break;
7618 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7619 schedule_timeout(timeout);
7620 timeout *= 2;
7621 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7622 status = -ERESTARTSYS;
7623 }
7624 return status;
7625 }
7626
7627 #ifdef CONFIG_NFS_V4_1
7628 struct nfs4_lock_waiter {
7629 struct inode *inode;
7630 struct nfs_lowner owner;
7631 wait_queue_entry_t wait;
7632 };
7633
7634 static int
nfs4_wake_lock_waiter(wait_queue_entry_t * wait,unsigned int mode,int flags,void * key)7635 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7636 {
7637 struct nfs4_lock_waiter *waiter =
7638 container_of(wait, struct nfs4_lock_waiter, wait);
7639
7640 /* NULL key means to wake up everyone */
7641 if (key) {
7642 struct cb_notify_lock_args *cbnl = key;
7643 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
7644 *wowner = &waiter->owner;
7645
7646 /* Only wake if the callback was for the same owner. */
7647 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7648 return 0;
7649
7650 /* Make sure it's for the right inode */
7651 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7652 return 0;
7653 }
7654
7655 return woken_wake_function(wait, mode, flags, key);
7656 }
7657
7658 static int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7659 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7660 {
7661 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7662 struct nfs_server *server = NFS_SERVER(state->inode);
7663 struct nfs_client *clp = server->nfs_client;
7664 wait_queue_head_t *q = &clp->cl_lock_waitq;
7665 struct nfs4_lock_waiter waiter = {
7666 .inode = state->inode,
7667 .owner = { .clientid = clp->cl_clientid,
7668 .id = lsp->ls_seqid.owner_id,
7669 .s_dev = server->s_dev },
7670 };
7671 int status;
7672
7673 /* Don't bother with waitqueue if we don't expect a callback */
7674 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7675 return nfs4_retry_setlk_simple(state, cmd, request);
7676
7677 init_wait(&waiter.wait);
7678 waiter.wait.func = nfs4_wake_lock_waiter;
7679 add_wait_queue(q, &waiter.wait);
7680
7681 do {
7682 status = nfs4_proc_setlk(state, cmd, request);
7683 if (status != -EAGAIN || IS_SETLK(cmd))
7684 break;
7685
7686 status = -ERESTARTSYS;
7687 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7688 NFS4_LOCK_MAXTIMEOUT);
7689 } while (!signalled());
7690
7691 remove_wait_queue(q, &waiter.wait);
7692
7693 return status;
7694 }
7695 #else /* !CONFIG_NFS_V4_1 */
7696 static inline int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7697 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7698 {
7699 return nfs4_retry_setlk_simple(state, cmd, request);
7700 }
7701 #endif
7702
7703 static int
nfs4_proc_lock(struct file * filp,int cmd,struct file_lock * request)7704 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7705 {
7706 struct nfs_open_context *ctx;
7707 struct nfs4_state *state;
7708 int status;
7709
7710 /* verify open state */
7711 ctx = nfs_file_open_context(filp);
7712 state = ctx->state;
7713
7714 if (IS_GETLK(cmd)) {
7715 if (state != NULL)
7716 return nfs4_proc_getlk(state, F_GETLK, request);
7717 return 0;
7718 }
7719
7720 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7721 return -EINVAL;
7722
7723 if (lock_is_unlock(request)) {
7724 if (state != NULL)
7725 return nfs4_proc_unlck(state, cmd, request);
7726 return 0;
7727 }
7728
7729 if (state == NULL)
7730 return -ENOLCK;
7731
7732 if ((request->c.flc_flags & FL_POSIX) &&
7733 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7734 return -ENOLCK;
7735
7736 /*
7737 * Don't rely on the VFS having checked the file open mode,
7738 * since it won't do this for flock() locks.
7739 */
7740 switch (request->c.flc_type) {
7741 case F_RDLCK:
7742 if (!(filp->f_mode & FMODE_READ))
7743 return -EBADF;
7744 break;
7745 case F_WRLCK:
7746 if (!(filp->f_mode & FMODE_WRITE))
7747 return -EBADF;
7748 }
7749
7750 status = nfs4_set_lock_state(state, request);
7751 if (status != 0)
7752 return status;
7753
7754 return nfs4_retry_setlk(state, cmd, request);
7755 }
7756
nfs4_delete_lease(struct file * file,void ** priv)7757 static int nfs4_delete_lease(struct file *file, void **priv)
7758 {
7759 return generic_setlease(file, F_UNLCK, NULL, priv);
7760 }
7761
nfs4_add_lease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7762 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease,
7763 void **priv)
7764 {
7765 struct inode *inode = file_inode(file);
7766 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7767 int ret;
7768
7769 /* No delegation, no lease */
7770 if (!nfs4_have_delegation(inode, type, 0))
7771 return -EAGAIN;
7772 ret = generic_setlease(file, arg, lease, priv);
7773 if (ret || nfs4_have_delegation(inode, type, 0))
7774 return ret;
7775 /* We raced with a delegation return */
7776 nfs4_delete_lease(file, priv);
7777 return -EAGAIN;
7778 }
7779
nfs4_proc_setlease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7780 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease,
7781 void **priv)
7782 {
7783 switch (arg) {
7784 case F_RDLCK:
7785 case F_WRLCK:
7786 return nfs4_add_lease(file, arg, lease, priv);
7787 case F_UNLCK:
7788 return nfs4_delete_lease(file, priv);
7789 default:
7790 return -EINVAL;
7791 }
7792 }
7793
nfs4_lock_delegation_recall(struct file_lock * fl,struct nfs4_state * state,const nfs4_stateid * stateid)7794 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7795 {
7796 struct nfs_server *server = NFS_SERVER(state->inode);
7797 int err;
7798
7799 err = nfs4_set_lock_state(state, fl);
7800 if (err != 0)
7801 return err;
7802 do {
7803 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7804 if (err != -NFS4ERR_DELAY)
7805 break;
7806 ssleep(1);
7807 } while (err == -NFS4ERR_DELAY);
7808 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7809 }
7810
7811 struct nfs_release_lockowner_data {
7812 struct nfs4_lock_state *lsp;
7813 struct nfs_server *server;
7814 struct nfs_release_lockowner_args args;
7815 struct nfs_release_lockowner_res res;
7816 unsigned long timestamp;
7817 };
7818
nfs4_release_lockowner_prepare(struct rpc_task * task,void * calldata)7819 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7820 {
7821 struct nfs_release_lockowner_data *data = calldata;
7822 struct nfs_server *server = data->server;
7823 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7824 &data->res.seq_res, task);
7825 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7826 data->timestamp = jiffies;
7827 }
7828
nfs4_release_lockowner_done(struct rpc_task * task,void * calldata)7829 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7830 {
7831 struct nfs_release_lockowner_data *data = calldata;
7832 struct nfs_server *server = data->server;
7833
7834 nfs40_sequence_done(task, &data->res.seq_res);
7835
7836 switch (task->tk_status) {
7837 case 0:
7838 renew_lease(server, data->timestamp);
7839 break;
7840 case -NFS4ERR_STALE_CLIENTID:
7841 case -NFS4ERR_EXPIRED:
7842 nfs4_schedule_lease_recovery(server->nfs_client);
7843 break;
7844 case -NFS4ERR_LEASE_MOVED:
7845 case -NFS4ERR_DELAY:
7846 if (nfs4_async_handle_error(task, server,
7847 NULL, NULL) == -EAGAIN)
7848 rpc_restart_call_prepare(task);
7849 }
7850 }
7851
nfs4_release_lockowner_release(void * calldata)7852 static void nfs4_release_lockowner_release(void *calldata)
7853 {
7854 struct nfs_release_lockowner_data *data = calldata;
7855 nfs4_free_lock_state(data->server, data->lsp);
7856 kfree(calldata);
7857 }
7858
7859 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7860 .rpc_call_prepare = nfs4_release_lockowner_prepare,
7861 .rpc_call_done = nfs4_release_lockowner_done,
7862 .rpc_release = nfs4_release_lockowner_release,
7863 };
7864
7865 static void
nfs4_release_lockowner(struct nfs_server * server,struct nfs4_lock_state * lsp)7866 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7867 {
7868 struct nfs_release_lockowner_data *data;
7869 struct rpc_message msg = {
7870 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7871 };
7872
7873 if (server->nfs_client->cl_mvops->minor_version != 0)
7874 return;
7875
7876 data = kmalloc(sizeof(*data), GFP_KERNEL);
7877 if (!data)
7878 return;
7879 data->lsp = lsp;
7880 data->server = server;
7881 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7882 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7883 data->args.lock_owner.s_dev = server->s_dev;
7884
7885 msg.rpc_argp = &data->args;
7886 msg.rpc_resp = &data->res;
7887 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7888 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7889 }
7890
7891 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7892
nfs4_xattr_set_nfs4_acl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7893 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7894 struct mnt_idmap *idmap,
7895 struct dentry *unused, struct inode *inode,
7896 const char *key, const void *buf,
7897 size_t buflen, int flags)
7898 {
7899 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7900 }
7901
nfs4_xattr_get_nfs4_acl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7902 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7903 struct dentry *unused, struct inode *inode,
7904 const char *key, void *buf, size_t buflen)
7905 {
7906 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7907 }
7908
nfs4_xattr_list_nfs4_acl(struct dentry * dentry)7909 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7910 {
7911 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7912 }
7913
7914 #if defined(CONFIG_NFS_V4_1)
7915 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7916
nfs4_xattr_set_nfs4_dacl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7917 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7918 struct mnt_idmap *idmap,
7919 struct dentry *unused, struct inode *inode,
7920 const char *key, const void *buf,
7921 size_t buflen, int flags)
7922 {
7923 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7924 }
7925
nfs4_xattr_get_nfs4_dacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7926 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7927 struct dentry *unused, struct inode *inode,
7928 const char *key, void *buf, size_t buflen)
7929 {
7930 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7931 }
7932
nfs4_xattr_list_nfs4_dacl(struct dentry * dentry)7933 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7934 {
7935 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7936 }
7937
7938 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7939
nfs4_xattr_set_nfs4_sacl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7940 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7941 struct mnt_idmap *idmap,
7942 struct dentry *unused, struct inode *inode,
7943 const char *key, const void *buf,
7944 size_t buflen, int flags)
7945 {
7946 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7947 }
7948
nfs4_xattr_get_nfs4_sacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7949 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7950 struct dentry *unused, struct inode *inode,
7951 const char *key, void *buf, size_t buflen)
7952 {
7953 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7954 }
7955
nfs4_xattr_list_nfs4_sacl(struct dentry * dentry)7956 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7957 {
7958 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7959 }
7960
7961 #endif
7962
7963 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7964
nfs4_xattr_set_nfs4_label(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7965 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7966 struct mnt_idmap *idmap,
7967 struct dentry *unused, struct inode *inode,
7968 const char *key, const void *buf,
7969 size_t buflen, int flags)
7970 {
7971 if (security_ismaclabel(key))
7972 return nfs4_set_security_label(inode, buf, buflen);
7973
7974 return -EOPNOTSUPP;
7975 }
7976
nfs4_xattr_get_nfs4_label(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7977 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7978 struct dentry *unused, struct inode *inode,
7979 const char *key, void *buf, size_t buflen)
7980 {
7981 if (security_ismaclabel(key))
7982 return nfs4_get_security_label(inode, buf, buflen);
7983 return -EOPNOTSUPP;
7984 }
7985
7986 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)7987 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7988 {
7989 int len = 0;
7990
7991 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7992 len = security_inode_listsecurity(inode, list, list_len);
7993 if (len >= 0 && list_len && len > list_len)
7994 return -ERANGE;
7995 }
7996 return len;
7997 }
7998
7999 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
8000 .prefix = XATTR_SECURITY_PREFIX,
8001 .get = nfs4_xattr_get_nfs4_label,
8002 .set = nfs4_xattr_set_nfs4_label,
8003 };
8004
8005 #else
8006
8007 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)8008 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
8009 {
8010 return 0;
8011 }
8012
8013 #endif
8014
8015 #ifdef CONFIG_NFS_V4_2
nfs4_xattr_set_nfs4_user(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)8016 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
8017 struct mnt_idmap *idmap,
8018 struct dentry *unused, struct inode *inode,
8019 const char *key, const void *buf,
8020 size_t buflen, int flags)
8021 {
8022 u32 mask;
8023 int ret;
8024
8025 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8026 return -EOPNOTSUPP;
8027
8028 /*
8029 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
8030 * flags right now. Handling of xattr operations use the normal
8031 * file read/write permissions.
8032 *
8033 * Just in case the server has other ideas (which RFC 8276 allows),
8034 * do a cached access check for the XA* flags to possibly avoid
8035 * doing an RPC and getting EACCES back.
8036 */
8037 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8038 if (!(mask & NFS_ACCESS_XAWRITE))
8039 return -EACCES;
8040 }
8041
8042 if (buf == NULL) {
8043 ret = nfs42_proc_removexattr(inode, key);
8044 if (!ret)
8045 nfs4_xattr_cache_remove(inode, key);
8046 } else {
8047 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
8048 if (!ret)
8049 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
8050 }
8051
8052 return ret;
8053 }
8054
nfs4_xattr_get_nfs4_user(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)8055 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
8056 struct dentry *unused, struct inode *inode,
8057 const char *key, void *buf, size_t buflen)
8058 {
8059 u32 mask;
8060 ssize_t ret;
8061
8062 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8063 return -EOPNOTSUPP;
8064
8065 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8066 if (!(mask & NFS_ACCESS_XAREAD))
8067 return -EACCES;
8068 }
8069
8070 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8071 if (ret)
8072 return ret;
8073
8074 ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
8075 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8076 return ret;
8077
8078 ret = nfs42_proc_getxattr(inode, key, buf, buflen);
8079
8080 return ret;
8081 }
8082
8083 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8084 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8085 {
8086 u64 cookie;
8087 bool eof;
8088 ssize_t ret, size;
8089 char *buf;
8090 size_t buflen;
8091 u32 mask;
8092
8093 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8094 return 0;
8095
8096 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8097 if (!(mask & NFS_ACCESS_XALIST))
8098 return 0;
8099 }
8100
8101 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8102 if (ret)
8103 return ret;
8104
8105 ret = nfs4_xattr_cache_list(inode, list, list_len);
8106 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8107 return ret;
8108
8109 cookie = 0;
8110 eof = false;
8111 buflen = list_len ? list_len : XATTR_LIST_MAX;
8112 buf = list_len ? list : NULL;
8113 size = 0;
8114
8115 while (!eof) {
8116 ret = nfs42_proc_listxattrs(inode, buf, buflen,
8117 &cookie, &eof);
8118 if (ret < 0)
8119 return ret;
8120
8121 if (list_len) {
8122 buf += ret;
8123 buflen -= ret;
8124 }
8125 size += ret;
8126 }
8127
8128 if (list_len)
8129 nfs4_xattr_cache_set_list(inode, list, size);
8130
8131 return size;
8132 }
8133
8134 #else
8135
8136 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8137 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8138 {
8139 return 0;
8140 }
8141 #endif /* CONFIG_NFS_V4_2 */
8142
8143 /*
8144 * nfs_fhget will use either the mounted_on_fileid or the fileid
8145 */
nfs_fixup_referral_attributes(struct nfs_fattr * fattr)8146 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
8147 {
8148 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
8149 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
8150 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
8151 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
8152 return;
8153
8154 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
8155 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
8156 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
8157 fattr->nlink = 2;
8158 }
8159
_nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8160 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8161 const struct qstr *name,
8162 struct nfs4_fs_locations *fs_locations,
8163 struct page *page)
8164 {
8165 struct nfs_server *server = NFS_SERVER(dir);
8166 u32 bitmask[3];
8167 struct nfs4_fs_locations_arg args = {
8168 .dir_fh = NFS_FH(dir),
8169 .name = name,
8170 .page = page,
8171 .bitmask = bitmask,
8172 };
8173 struct nfs4_fs_locations_res res = {
8174 .fs_locations = fs_locations,
8175 };
8176 struct rpc_message msg = {
8177 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8178 .rpc_argp = &args,
8179 .rpc_resp = &res,
8180 };
8181 int status;
8182
8183 dprintk("%s: start\n", __func__);
8184
8185 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8186 bitmask[1] = nfs4_fattr_bitmap[1];
8187
8188 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8189 * is not supported */
8190 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8191 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8192 else
8193 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8194
8195 nfs_fattr_init(fs_locations->fattr);
8196 fs_locations->server = server;
8197 fs_locations->nlocations = 0;
8198 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8199 dprintk("%s: returned status = %d\n", __func__, status);
8200 return status;
8201 }
8202
nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8203 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8204 const struct qstr *name,
8205 struct nfs4_fs_locations *fs_locations,
8206 struct page *page)
8207 {
8208 struct nfs4_exception exception = {
8209 .interruptible = true,
8210 };
8211 int err;
8212 do {
8213 err = _nfs4_proc_fs_locations(client, dir, name,
8214 fs_locations, page);
8215 trace_nfs4_get_fs_locations(dir, name, err);
8216 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8217 &exception);
8218 } while (exception.retry);
8219 return err;
8220 }
8221
8222 /*
8223 * This operation also signals the server that this client is
8224 * performing migration recovery. The server can stop returning
8225 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
8226 * appended to this compound to identify the client ID which is
8227 * performing recovery.
8228 */
_nfs40_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8229 static int _nfs40_proc_get_locations(struct nfs_server *server,
8230 struct nfs_fh *fhandle,
8231 struct nfs4_fs_locations *locations,
8232 struct page *page, const struct cred *cred)
8233 {
8234 struct rpc_clnt *clnt = server->client;
8235 u32 bitmask[2] = {
8236 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8237 };
8238 struct nfs4_fs_locations_arg args = {
8239 .clientid = server->nfs_client->cl_clientid,
8240 .fh = fhandle,
8241 .page = page,
8242 .bitmask = bitmask,
8243 .migration = 1, /* skip LOOKUP */
8244 .renew = 1, /* append RENEW */
8245 };
8246 struct nfs4_fs_locations_res res = {
8247 .fs_locations = locations,
8248 .migration = 1,
8249 .renew = 1,
8250 };
8251 struct rpc_message msg = {
8252 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8253 .rpc_argp = &args,
8254 .rpc_resp = &res,
8255 .rpc_cred = cred,
8256 };
8257 unsigned long now = jiffies;
8258 int status;
8259
8260 nfs_fattr_init(locations->fattr);
8261 locations->server = server;
8262 locations->nlocations = 0;
8263
8264 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8265 status = nfs4_call_sync_sequence(clnt, server, &msg,
8266 &args.seq_args, &res.seq_res);
8267 if (status)
8268 return status;
8269
8270 renew_lease(server, now);
8271 return 0;
8272 }
8273
8274 #ifdef CONFIG_NFS_V4_1
8275
8276 /*
8277 * This operation also signals the server that this client is
8278 * performing migration recovery. The server can stop asserting
8279 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
8280 * performing this operation is identified in the SEQUENCE
8281 * operation in this compound.
8282 *
8283 * When the client supports GETATTR(fs_locations_info), it can
8284 * be plumbed in here.
8285 */
_nfs41_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8286 static int _nfs41_proc_get_locations(struct nfs_server *server,
8287 struct nfs_fh *fhandle,
8288 struct nfs4_fs_locations *locations,
8289 struct page *page, const struct cred *cred)
8290 {
8291 struct rpc_clnt *clnt = server->client;
8292 u32 bitmask[2] = {
8293 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8294 };
8295 struct nfs4_fs_locations_arg args = {
8296 .fh = fhandle,
8297 .page = page,
8298 .bitmask = bitmask,
8299 .migration = 1, /* skip LOOKUP */
8300 };
8301 struct nfs4_fs_locations_res res = {
8302 .fs_locations = locations,
8303 .migration = 1,
8304 };
8305 struct rpc_message msg = {
8306 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8307 .rpc_argp = &args,
8308 .rpc_resp = &res,
8309 .rpc_cred = cred,
8310 };
8311 struct nfs4_call_sync_data data = {
8312 .seq_server = server,
8313 .seq_args = &args.seq_args,
8314 .seq_res = &res.seq_res,
8315 };
8316 struct rpc_task_setup task_setup_data = {
8317 .rpc_client = clnt,
8318 .rpc_message = &msg,
8319 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8320 .callback_data = &data,
8321 .flags = RPC_TASK_NO_ROUND_ROBIN,
8322 };
8323 int status;
8324
8325 nfs_fattr_init(locations->fattr);
8326 locations->server = server;
8327 locations->nlocations = 0;
8328
8329 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8330 status = nfs4_call_sync_custom(&task_setup_data);
8331 if (status == NFS4_OK &&
8332 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8333 status = -NFS4ERR_LEASE_MOVED;
8334 return status;
8335 }
8336
8337 #endif /* CONFIG_NFS_V4_1 */
8338
8339 /**
8340 * nfs4_proc_get_locations - discover locations for a migrated FSID
8341 * @server: pointer to nfs_server to process
8342 * @fhandle: pointer to the kernel NFS client file handle
8343 * @locations: result of query
8344 * @page: buffer
8345 * @cred: credential to use for this operation
8346 *
8347 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8348 * operation failed, or a negative errno if a local error occurred.
8349 *
8350 * On success, "locations" is filled in, but if the server has
8351 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8352 * asserted.
8353 *
8354 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8355 * from this client that require migration recovery.
8356 */
nfs4_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8357 int nfs4_proc_get_locations(struct nfs_server *server,
8358 struct nfs_fh *fhandle,
8359 struct nfs4_fs_locations *locations,
8360 struct page *page, const struct cred *cred)
8361 {
8362 struct nfs_client *clp = server->nfs_client;
8363 const struct nfs4_mig_recovery_ops *ops =
8364 clp->cl_mvops->mig_recovery_ops;
8365 struct nfs4_exception exception = {
8366 .interruptible = true,
8367 };
8368 int status;
8369
8370 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8371 (unsigned long long)server->fsid.major,
8372 (unsigned long long)server->fsid.minor,
8373 clp->cl_hostname);
8374 nfs_display_fhandle(fhandle, __func__);
8375
8376 do {
8377 status = ops->get_locations(server, fhandle, locations, page,
8378 cred);
8379 if (status != -NFS4ERR_DELAY)
8380 break;
8381 nfs4_handle_exception(server, status, &exception);
8382 } while (exception.retry);
8383 return status;
8384 }
8385
8386 /*
8387 * This operation also signals the server that this client is
8388 * performing "lease moved" recovery. The server can stop
8389 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
8390 * is appended to this compound to identify the client ID which is
8391 * performing recovery.
8392 */
_nfs40_proc_fsid_present(struct inode * inode,const struct cred * cred)8393 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8394 {
8395 struct nfs_server *server = NFS_SERVER(inode);
8396 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8397 struct rpc_clnt *clnt = server->client;
8398 struct nfs4_fsid_present_arg args = {
8399 .fh = NFS_FH(inode),
8400 .clientid = clp->cl_clientid,
8401 .renew = 1, /* append RENEW */
8402 };
8403 struct nfs4_fsid_present_res res = {
8404 .renew = 1,
8405 };
8406 struct rpc_message msg = {
8407 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8408 .rpc_argp = &args,
8409 .rpc_resp = &res,
8410 .rpc_cred = cred,
8411 };
8412 unsigned long now = jiffies;
8413 int status;
8414
8415 res.fh = nfs_alloc_fhandle();
8416 if (res.fh == NULL)
8417 return -ENOMEM;
8418
8419 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8420 status = nfs4_call_sync_sequence(clnt, server, &msg,
8421 &args.seq_args, &res.seq_res);
8422 nfs_free_fhandle(res.fh);
8423 if (status)
8424 return status;
8425
8426 do_renew_lease(clp, now);
8427 return 0;
8428 }
8429
8430 #ifdef CONFIG_NFS_V4_1
8431
8432 /*
8433 * This operation also signals the server that this client is
8434 * performing "lease moved" recovery. The server can stop asserting
8435 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
8436 * this operation is identified in the SEQUENCE operation in this
8437 * compound.
8438 */
_nfs41_proc_fsid_present(struct inode * inode,const struct cred * cred)8439 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8440 {
8441 struct nfs_server *server = NFS_SERVER(inode);
8442 struct rpc_clnt *clnt = server->client;
8443 struct nfs4_fsid_present_arg args = {
8444 .fh = NFS_FH(inode),
8445 };
8446 struct nfs4_fsid_present_res res = {
8447 };
8448 struct rpc_message msg = {
8449 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8450 .rpc_argp = &args,
8451 .rpc_resp = &res,
8452 .rpc_cred = cred,
8453 };
8454 int status;
8455
8456 res.fh = nfs_alloc_fhandle();
8457 if (res.fh == NULL)
8458 return -ENOMEM;
8459
8460 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8461 status = nfs4_call_sync_sequence(clnt, server, &msg,
8462 &args.seq_args, &res.seq_res);
8463 nfs_free_fhandle(res.fh);
8464 if (status == NFS4_OK &&
8465 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8466 status = -NFS4ERR_LEASE_MOVED;
8467 return status;
8468 }
8469
8470 #endif /* CONFIG_NFS_V4_1 */
8471
8472 /**
8473 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8474 * @inode: inode on FSID to check
8475 * @cred: credential to use for this operation
8476 *
8477 * Server indicates whether the FSID is present, moved, or not
8478 * recognized. This operation is necessary to clear a LEASE_MOVED
8479 * condition for this client ID.
8480 *
8481 * Returns NFS4_OK if the FSID is present on this server,
8482 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8483 * NFS4ERR code if some error occurred on the server, or a
8484 * negative errno if a local failure occurred.
8485 */
nfs4_proc_fsid_present(struct inode * inode,const struct cred * cred)8486 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8487 {
8488 struct nfs_server *server = NFS_SERVER(inode);
8489 struct nfs_client *clp = server->nfs_client;
8490 const struct nfs4_mig_recovery_ops *ops =
8491 clp->cl_mvops->mig_recovery_ops;
8492 struct nfs4_exception exception = {
8493 .interruptible = true,
8494 };
8495 int status;
8496
8497 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8498 (unsigned long long)server->fsid.major,
8499 (unsigned long long)server->fsid.minor,
8500 clp->cl_hostname);
8501 nfs_display_fhandle(NFS_FH(inode), __func__);
8502
8503 do {
8504 status = ops->fsid_present(inode, cred);
8505 if (status != -NFS4ERR_DELAY)
8506 break;
8507 nfs4_handle_exception(server, status, &exception);
8508 } while (exception.retry);
8509 return status;
8510 }
8511
8512 /*
8513 * If 'use_integrity' is true and the state managment nfs_client
8514 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8515 * and the machine credential as per RFC3530bis and RFC5661 Security
8516 * Considerations sections. Otherwise, just use the user cred with the
8517 * filesystem's rpc_client.
8518 */
_nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors,bool use_integrity)8519 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8520 {
8521 int status;
8522 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8523 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8524 struct nfs4_secinfo_arg args = {
8525 .dir_fh = NFS_FH(dir),
8526 .name = name,
8527 };
8528 struct nfs4_secinfo_res res = {
8529 .flavors = flavors,
8530 };
8531 struct rpc_message msg = {
8532 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8533 .rpc_argp = &args,
8534 .rpc_resp = &res,
8535 };
8536 struct nfs4_call_sync_data data = {
8537 .seq_server = NFS_SERVER(dir),
8538 .seq_args = &args.seq_args,
8539 .seq_res = &res.seq_res,
8540 };
8541 struct rpc_task_setup task_setup = {
8542 .rpc_client = clnt,
8543 .rpc_message = &msg,
8544 .callback_ops = clp->cl_mvops->call_sync_ops,
8545 .callback_data = &data,
8546 .flags = RPC_TASK_NO_ROUND_ROBIN,
8547 };
8548 const struct cred *cred = NULL;
8549
8550 if (use_integrity) {
8551 clnt = clp->cl_rpcclient;
8552 task_setup.rpc_client = clnt;
8553
8554 cred = nfs4_get_clid_cred(clp);
8555 msg.rpc_cred = cred;
8556 }
8557
8558 dprintk("NFS call secinfo %s\n", name->name);
8559
8560 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8561 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8562 status = nfs4_call_sync_custom(&task_setup);
8563
8564 dprintk("NFS reply secinfo: %d\n", status);
8565
8566 put_cred(cred);
8567 return status;
8568 }
8569
nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors)8570 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8571 struct nfs4_secinfo_flavors *flavors)
8572 {
8573 struct nfs4_exception exception = {
8574 .interruptible = true,
8575 };
8576 int err;
8577 do {
8578 err = -NFS4ERR_WRONGSEC;
8579
8580 /* try to use integrity protection with machine cred */
8581 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8582 err = _nfs4_proc_secinfo(dir, name, flavors, true);
8583
8584 /*
8585 * if unable to use integrity protection, or SECINFO with
8586 * integrity protection returns NFS4ERR_WRONGSEC (which is
8587 * disallowed by spec, but exists in deployed servers) use
8588 * the current filesystem's rpc_client and the user cred.
8589 */
8590 if (err == -NFS4ERR_WRONGSEC)
8591 err = _nfs4_proc_secinfo(dir, name, flavors, false);
8592
8593 trace_nfs4_secinfo(dir, name, err);
8594 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8595 &exception);
8596 } while (exception.retry);
8597 return err;
8598 }
8599
8600 #ifdef CONFIG_NFS_V4_1
8601 /*
8602 * Check the exchange flags returned by the server for invalid flags, having
8603 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8604 * DS flags set.
8605 */
nfs4_check_cl_exchange_flags(u32 flags,u32 version)8606 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8607 {
8608 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8609 goto out_inval;
8610 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8611 goto out_inval;
8612 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8613 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8614 goto out_inval;
8615 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8616 goto out_inval;
8617 return NFS_OK;
8618 out_inval:
8619 return -NFS4ERR_INVAL;
8620 }
8621
8622 static bool
nfs41_same_server_scope(struct nfs41_server_scope * a,struct nfs41_server_scope * b)8623 nfs41_same_server_scope(struct nfs41_server_scope *a,
8624 struct nfs41_server_scope *b)
8625 {
8626 if (a->server_scope_sz != b->server_scope_sz)
8627 return false;
8628 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8629 }
8630
8631 static void
nfs4_bind_one_conn_to_session_done(struct rpc_task * task,void * calldata)8632 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8633 {
8634 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8635 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8636 struct nfs_client *clp = args->client;
8637
8638 switch (task->tk_status) {
8639 case -NFS4ERR_BADSESSION:
8640 case -NFS4ERR_DEADSESSION:
8641 nfs4_schedule_session_recovery(clp->cl_session,
8642 task->tk_status);
8643 return;
8644 }
8645 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8646 res->dir != NFS4_CDFS4_BOTH) {
8647 rpc_task_close_connection(task);
8648 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8649 rpc_restart_call(task);
8650 }
8651 }
8652
8653 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8654 .rpc_call_done = nfs4_bind_one_conn_to_session_done,
8655 };
8656
8657 /*
8658 * nfs4_proc_bind_one_conn_to_session()
8659 *
8660 * The 4.1 client currently uses the same TCP connection for the
8661 * fore and backchannel.
8662 */
8663 static
nfs4_proc_bind_one_conn_to_session(struct rpc_clnt * clnt,struct rpc_xprt * xprt,struct nfs_client * clp,const struct cred * cred)8664 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8665 struct rpc_xprt *xprt,
8666 struct nfs_client *clp,
8667 const struct cred *cred)
8668 {
8669 int status;
8670 struct nfs41_bind_conn_to_session_args args = {
8671 .client = clp,
8672 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8673 .retries = 0,
8674 };
8675 struct nfs41_bind_conn_to_session_res res;
8676 struct rpc_message msg = {
8677 .rpc_proc =
8678 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8679 .rpc_argp = &args,
8680 .rpc_resp = &res,
8681 .rpc_cred = cred,
8682 };
8683 struct rpc_task_setup task_setup_data = {
8684 .rpc_client = clnt,
8685 .rpc_xprt = xprt,
8686 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8687 .rpc_message = &msg,
8688 .flags = RPC_TASK_TIMEOUT,
8689 };
8690 struct rpc_task *task;
8691
8692 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8693 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8694 args.dir = NFS4_CDFC4_FORE;
8695
8696 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8697 if (xprt != rcu_access_pointer(clnt->cl_xprt))
8698 args.dir = NFS4_CDFC4_FORE;
8699
8700 task = rpc_run_task(&task_setup_data);
8701 if (!IS_ERR(task)) {
8702 status = task->tk_status;
8703 rpc_put_task(task);
8704 } else
8705 status = PTR_ERR(task);
8706 trace_nfs4_bind_conn_to_session(clp, status);
8707 if (status == 0) {
8708 if (memcmp(res.sessionid.data,
8709 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8710 dprintk("NFS: %s: Session ID mismatch\n", __func__);
8711 return -EIO;
8712 }
8713 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8714 dprintk("NFS: %s: Unexpected direction from server\n",
8715 __func__);
8716 return -EIO;
8717 }
8718 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8719 dprintk("NFS: %s: Server returned RDMA mode = true\n",
8720 __func__);
8721 return -EIO;
8722 }
8723 }
8724
8725 return status;
8726 }
8727
8728 struct rpc_bind_conn_calldata {
8729 struct nfs_client *clp;
8730 const struct cred *cred;
8731 };
8732
8733 static int
nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * calldata)8734 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8735 struct rpc_xprt *xprt,
8736 void *calldata)
8737 {
8738 struct rpc_bind_conn_calldata *p = calldata;
8739
8740 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8741 }
8742
nfs4_proc_bind_conn_to_session(struct nfs_client * clp,const struct cred * cred)8743 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8744 {
8745 struct rpc_bind_conn_calldata data = {
8746 .clp = clp,
8747 .cred = cred,
8748 };
8749 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8750 nfs4_proc_bind_conn_to_session_callback, &data);
8751 }
8752
8753 /*
8754 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8755 * and operations we'd like to see to enable certain features in the allow map
8756 */
8757 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8758 .how = SP4_MACH_CRED,
8759 .enforce.u.words = {
8760 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8761 1 << (OP_EXCHANGE_ID - 32) |
8762 1 << (OP_CREATE_SESSION - 32) |
8763 1 << (OP_DESTROY_SESSION - 32) |
8764 1 << (OP_DESTROY_CLIENTID - 32)
8765 },
8766 .allow.u.words = {
8767 [0] = 1 << (OP_CLOSE) |
8768 1 << (OP_OPEN_DOWNGRADE) |
8769 1 << (OP_LOCKU) |
8770 1 << (OP_DELEGRETURN) |
8771 1 << (OP_COMMIT),
8772 [1] = 1 << (OP_SECINFO - 32) |
8773 1 << (OP_SECINFO_NO_NAME - 32) |
8774 1 << (OP_LAYOUTRETURN - 32) |
8775 1 << (OP_TEST_STATEID - 32) |
8776 1 << (OP_FREE_STATEID - 32) |
8777 1 << (OP_WRITE - 32)
8778 }
8779 };
8780
8781 /*
8782 * Select the state protection mode for client `clp' given the server results
8783 * from exchange_id in `sp'.
8784 *
8785 * Returns 0 on success, negative errno otherwise.
8786 */
nfs4_sp4_select_mode(struct nfs_client * clp,struct nfs41_state_protection * sp)8787 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8788 struct nfs41_state_protection *sp)
8789 {
8790 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8791 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8792 1 << (OP_EXCHANGE_ID - 32) |
8793 1 << (OP_CREATE_SESSION - 32) |
8794 1 << (OP_DESTROY_SESSION - 32) |
8795 1 << (OP_DESTROY_CLIENTID - 32)
8796 };
8797 unsigned long flags = 0;
8798 unsigned int i;
8799 int ret = 0;
8800
8801 if (sp->how == SP4_MACH_CRED) {
8802 /* Print state protect result */
8803 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8804 for (i = 0; i <= LAST_NFS4_OP; i++) {
8805 if (test_bit(i, sp->enforce.u.longs))
8806 dfprintk(MOUNT, " enforce op %d\n", i);
8807 if (test_bit(i, sp->allow.u.longs))
8808 dfprintk(MOUNT, " allow op %d\n", i);
8809 }
8810
8811 /* make sure nothing is on enforce list that isn't supported */
8812 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8813 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8814 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8815 ret = -EINVAL;
8816 goto out;
8817 }
8818 }
8819
8820 /*
8821 * Minimal mode - state operations are allowed to use machine
8822 * credential. Note this already happens by default, so the
8823 * client doesn't have to do anything more than the negotiation.
8824 *
8825 * NOTE: we don't care if EXCHANGE_ID is in the list -
8826 * we're already using the machine cred for exchange_id
8827 * and will never use a different cred.
8828 */
8829 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8830 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8831 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8832 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8833 dfprintk(MOUNT, "sp4_mach_cred:\n");
8834 dfprintk(MOUNT, " minimal mode enabled\n");
8835 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8836 } else {
8837 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8838 ret = -EINVAL;
8839 goto out;
8840 }
8841
8842 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8843 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8844 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8845 test_bit(OP_LOCKU, sp->allow.u.longs)) {
8846 dfprintk(MOUNT, " cleanup mode enabled\n");
8847 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8848 }
8849
8850 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8851 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
8852 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8853 }
8854
8855 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8856 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8857 dfprintk(MOUNT, " secinfo mode enabled\n");
8858 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8859 }
8860
8861 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8862 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8863 dfprintk(MOUNT, " stateid mode enabled\n");
8864 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8865 }
8866
8867 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8868 dfprintk(MOUNT, " write mode enabled\n");
8869 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8870 }
8871
8872 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8873 dfprintk(MOUNT, " commit mode enabled\n");
8874 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8875 }
8876 }
8877 out:
8878 clp->cl_sp4_flags = flags;
8879 return ret;
8880 }
8881
8882 struct nfs41_exchange_id_data {
8883 struct nfs41_exchange_id_res res;
8884 struct nfs41_exchange_id_args args;
8885 };
8886
nfs4_exchange_id_release(void * data)8887 static void nfs4_exchange_id_release(void *data)
8888 {
8889 struct nfs41_exchange_id_data *cdata =
8890 (struct nfs41_exchange_id_data *)data;
8891
8892 nfs_put_client(cdata->args.client);
8893 kfree(cdata->res.impl_id);
8894 kfree(cdata->res.server_scope);
8895 kfree(cdata->res.server_owner);
8896 kfree(cdata);
8897 }
8898
8899 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8900 .rpc_release = nfs4_exchange_id_release,
8901 };
8902
8903 /*
8904 * _nfs4_proc_exchange_id()
8905 *
8906 * Wrapper for EXCHANGE_ID operation.
8907 */
8908 static struct rpc_task *
nfs4_run_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how,struct rpc_xprt * xprt)8909 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8910 u32 sp4_how, struct rpc_xprt *xprt)
8911 {
8912 struct rpc_message msg = {
8913 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8914 .rpc_cred = cred,
8915 };
8916 struct rpc_task_setup task_setup_data = {
8917 .rpc_client = clp->cl_rpcclient,
8918 .callback_ops = &nfs4_exchange_id_call_ops,
8919 .rpc_message = &msg,
8920 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8921 };
8922 struct nfs41_exchange_id_data *calldata;
8923 int status;
8924
8925 if (!refcount_inc_not_zero(&clp->cl_count))
8926 return ERR_PTR(-EIO);
8927
8928 status = -ENOMEM;
8929 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8930 if (!calldata)
8931 goto out;
8932
8933 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8934
8935 status = nfs4_init_uniform_client_string(clp);
8936 if (status)
8937 goto out_calldata;
8938
8939 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8940 GFP_NOFS);
8941 status = -ENOMEM;
8942 if (unlikely(calldata->res.server_owner == NULL))
8943 goto out_calldata;
8944
8945 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8946 GFP_NOFS);
8947 if (unlikely(calldata->res.server_scope == NULL))
8948 goto out_server_owner;
8949
8950 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8951 if (unlikely(calldata->res.impl_id == NULL))
8952 goto out_server_scope;
8953
8954 switch (sp4_how) {
8955 case SP4_NONE:
8956 calldata->args.state_protect.how = SP4_NONE;
8957 break;
8958
8959 case SP4_MACH_CRED:
8960 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8961 break;
8962
8963 default:
8964 /* unsupported! */
8965 WARN_ON_ONCE(1);
8966 status = -EINVAL;
8967 goto out_impl_id;
8968 }
8969 if (xprt) {
8970 task_setup_data.rpc_xprt = xprt;
8971 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8972 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8973 sizeof(calldata->args.verifier.data));
8974 }
8975 calldata->args.client = clp;
8976 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8977 EXCHGID4_FLAG_BIND_PRINC_STATEID;
8978 #ifdef CONFIG_NFS_V4_1_MIGRATION
8979 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8980 #endif
8981 if (test_bit(NFS_CS_PNFS, &clp->cl_flags))
8982 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8983 msg.rpc_argp = &calldata->args;
8984 msg.rpc_resp = &calldata->res;
8985 task_setup_data.callback_data = calldata;
8986
8987 return rpc_run_task(&task_setup_data);
8988
8989 out_impl_id:
8990 kfree(calldata->res.impl_id);
8991 out_server_scope:
8992 kfree(calldata->res.server_scope);
8993 out_server_owner:
8994 kfree(calldata->res.server_owner);
8995 out_calldata:
8996 kfree(calldata);
8997 out:
8998 nfs_put_client(clp);
8999 return ERR_PTR(status);
9000 }
9001
9002 /*
9003 * _nfs4_proc_exchange_id()
9004 *
9005 * Wrapper for EXCHANGE_ID operation.
9006 */
_nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how)9007 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
9008 u32 sp4_how)
9009 {
9010 struct rpc_task *task;
9011 struct nfs41_exchange_id_args *argp;
9012 struct nfs41_exchange_id_res *resp;
9013 unsigned long now = jiffies;
9014 int status;
9015
9016 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
9017 if (IS_ERR(task))
9018 return PTR_ERR(task);
9019
9020 argp = task->tk_msg.rpc_argp;
9021 resp = task->tk_msg.rpc_resp;
9022 status = task->tk_status;
9023 if (status != 0)
9024 goto out;
9025
9026 status = nfs4_check_cl_exchange_flags(resp->flags,
9027 clp->cl_mvops->minor_version);
9028 if (status != 0)
9029 goto out;
9030
9031 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
9032 if (status != 0)
9033 goto out;
9034
9035 do_renew_lease(clp, now);
9036
9037 clp->cl_clientid = resp->clientid;
9038 clp->cl_exchange_flags = resp->flags;
9039 clp->cl_seqid = resp->seqid;
9040 /* Client ID is not confirmed */
9041 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
9042 clear_bit(NFS4_SESSION_ESTABLISHED,
9043 &clp->cl_session->session_state);
9044
9045 if (clp->cl_serverscope != NULL &&
9046 !nfs41_same_server_scope(clp->cl_serverscope,
9047 resp->server_scope)) {
9048 dprintk("%s: server_scope mismatch detected\n",
9049 __func__);
9050 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
9051 }
9052
9053 swap(clp->cl_serverowner, resp->server_owner);
9054 swap(clp->cl_serverscope, resp->server_scope);
9055 swap(clp->cl_implid, resp->impl_id);
9056
9057 /* Save the EXCHANGE_ID verifier session trunk tests */
9058 memcpy(clp->cl_confirm.data, argp->verifier.data,
9059 sizeof(clp->cl_confirm.data));
9060 out:
9061 trace_nfs4_exchange_id(clp, status);
9062 rpc_put_task(task);
9063 return status;
9064 }
9065
9066 /*
9067 * nfs4_proc_exchange_id()
9068 *
9069 * Returns zero, a negative errno, or a negative NFS4ERR status code.
9070 *
9071 * Since the clientid has expired, all compounds using sessions
9072 * associated with the stale clientid will be returning
9073 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
9074 * be in some phase of session reset.
9075 *
9076 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
9077 */
nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred)9078 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
9079 {
9080 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
9081 int status;
9082
9083 /* try SP4_MACH_CRED if krb5i/p */
9084 if (authflavor == RPC_AUTH_GSS_KRB5I ||
9085 authflavor == RPC_AUTH_GSS_KRB5P) {
9086 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
9087 if (!status)
9088 return 0;
9089 }
9090
9091 /* try SP4_NONE */
9092 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
9093 }
9094
9095 /**
9096 * nfs4_test_session_trunk
9097 *
9098 * This is an add_xprt_test() test function called from
9099 * rpc_clnt_setup_test_and_add_xprt.
9100 *
9101 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
9102 * and is dereferrenced in nfs4_exchange_id_release
9103 *
9104 * Upon success, add the new transport to the rpc_clnt
9105 *
9106 * @clnt: struct rpc_clnt to get new transport
9107 * @xprt: the rpc_xprt to test
9108 * @data: call data for _nfs4_proc_exchange_id.
9109 */
nfs4_test_session_trunk(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * data)9110 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
9111 void *data)
9112 {
9113 struct nfs4_add_xprt_data *adata = data;
9114 struct rpc_task *task;
9115 int status;
9116
9117 u32 sp4_how;
9118
9119 dprintk("--> %s try %s\n", __func__,
9120 xprt->address_strings[RPC_DISPLAY_ADDR]);
9121
9122 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
9123
9124 try_again:
9125 /* Test connection for session trunking. Async exchange_id call */
9126 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
9127 if (IS_ERR(task))
9128 return;
9129
9130 status = task->tk_status;
9131 if (status == 0) {
9132 status = nfs4_detect_session_trunking(adata->clp,
9133 task->tk_msg.rpc_resp, xprt);
9134 trace_nfs4_trunked_exchange_id(adata->clp,
9135 xprt->address_strings[RPC_DISPLAY_ADDR], status);
9136 }
9137 if (status == 0)
9138 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
9139 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
9140 (struct sockaddr *)&xprt->addr))
9141 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
9142
9143 rpc_put_task(task);
9144 if (status == -NFS4ERR_DELAY) {
9145 ssleep(1);
9146 goto try_again;
9147 }
9148 }
9149 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
9150
_nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)9151 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
9152 const struct cred *cred)
9153 {
9154 struct rpc_message msg = {
9155 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
9156 .rpc_argp = clp,
9157 .rpc_cred = cred,
9158 };
9159 int status;
9160
9161 status = rpc_call_sync(clp->cl_rpcclient, &msg,
9162 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9163 trace_nfs4_destroy_clientid(clp, status);
9164 if (status)
9165 dprintk("NFS: Got error %d from the server %s on "
9166 "DESTROY_CLIENTID.", status, clp->cl_hostname);
9167 return status;
9168 }
9169
nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)9170 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9171 const struct cred *cred)
9172 {
9173 unsigned int loop;
9174 int ret;
9175
9176 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9177 ret = _nfs4_proc_destroy_clientid(clp, cred);
9178 switch (ret) {
9179 case -NFS4ERR_DELAY:
9180 case -NFS4ERR_CLIENTID_BUSY:
9181 ssleep(1);
9182 break;
9183 default:
9184 return ret;
9185 }
9186 }
9187 return 0;
9188 }
9189
nfs4_destroy_clientid(struct nfs_client * clp)9190 int nfs4_destroy_clientid(struct nfs_client *clp)
9191 {
9192 const struct cred *cred;
9193 int ret = 0;
9194
9195 if (clp->cl_mvops->minor_version < 1)
9196 goto out;
9197 if (clp->cl_exchange_flags == 0)
9198 goto out;
9199 if (clp->cl_preserve_clid)
9200 goto out;
9201 cred = nfs4_get_clid_cred(clp);
9202 ret = nfs4_proc_destroy_clientid(clp, cred);
9203 put_cred(cred);
9204 switch (ret) {
9205 case 0:
9206 case -NFS4ERR_STALE_CLIENTID:
9207 clp->cl_exchange_flags = 0;
9208 }
9209 out:
9210 return ret;
9211 }
9212
9213 #endif /* CONFIG_NFS_V4_1 */
9214
9215 struct nfs4_get_lease_time_data {
9216 struct nfs4_get_lease_time_args *args;
9217 struct nfs4_get_lease_time_res *res;
9218 struct nfs_client *clp;
9219 };
9220
nfs4_get_lease_time_prepare(struct rpc_task * task,void * calldata)9221 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9222 void *calldata)
9223 {
9224 struct nfs4_get_lease_time_data *data =
9225 (struct nfs4_get_lease_time_data *)calldata;
9226
9227 /* just setup sequence, do not trigger session recovery
9228 since we're invoked within one */
9229 nfs4_setup_sequence(data->clp,
9230 &data->args->la_seq_args,
9231 &data->res->lr_seq_res,
9232 task);
9233 }
9234
9235 /*
9236 * Called from nfs4_state_manager thread for session setup, so don't recover
9237 * from sequence operation or clientid errors.
9238 */
nfs4_get_lease_time_done(struct rpc_task * task,void * calldata)9239 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9240 {
9241 struct nfs4_get_lease_time_data *data =
9242 (struct nfs4_get_lease_time_data *)calldata;
9243
9244 if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9245 return;
9246 switch (task->tk_status) {
9247 case -NFS4ERR_DELAY:
9248 case -NFS4ERR_GRACE:
9249 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9250 task->tk_status = 0;
9251 fallthrough;
9252 case -NFS4ERR_RETRY_UNCACHED_REP:
9253 rpc_restart_call_prepare(task);
9254 return;
9255 }
9256 }
9257
9258 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9259 .rpc_call_prepare = nfs4_get_lease_time_prepare,
9260 .rpc_call_done = nfs4_get_lease_time_done,
9261 };
9262
nfs4_proc_get_lease_time(struct nfs_client * clp,struct nfs_fsinfo * fsinfo)9263 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9264 {
9265 struct nfs4_get_lease_time_args args;
9266 struct nfs4_get_lease_time_res res = {
9267 .lr_fsinfo = fsinfo,
9268 };
9269 struct nfs4_get_lease_time_data data = {
9270 .args = &args,
9271 .res = &res,
9272 .clp = clp,
9273 };
9274 struct rpc_message msg = {
9275 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9276 .rpc_argp = &args,
9277 .rpc_resp = &res,
9278 };
9279 struct rpc_task_setup task_setup = {
9280 .rpc_client = clp->cl_rpcclient,
9281 .rpc_message = &msg,
9282 .callback_ops = &nfs4_get_lease_time_ops,
9283 .callback_data = &data,
9284 .flags = RPC_TASK_TIMEOUT,
9285 };
9286
9287 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9288 return nfs4_call_sync_custom(&task_setup);
9289 }
9290
9291 #ifdef CONFIG_NFS_V4_1
9292
9293 /*
9294 * Initialize the values to be used by the client in CREATE_SESSION
9295 * If nfs4_init_session set the fore channel request and response sizes,
9296 * use them.
9297 *
9298 * Set the back channel max_resp_sz_cached to zero to force the client to
9299 * always set csa_cachethis to FALSE because the current implementation
9300 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9301 */
nfs4_init_channel_attrs(struct nfs41_create_session_args * args,struct rpc_clnt * clnt)9302 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9303 struct rpc_clnt *clnt)
9304 {
9305 unsigned int max_rqst_sz, max_resp_sz;
9306 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9307 unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9308
9309 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9310 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9311
9312 /* Fore channel attributes */
9313 args->fc_attrs.max_rqst_sz = max_rqst_sz;
9314 args->fc_attrs.max_resp_sz = max_resp_sz;
9315 args->fc_attrs.max_ops = NFS4_MAX_OPS;
9316 args->fc_attrs.max_reqs = max_session_slots;
9317
9318 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9319 "max_ops=%u max_reqs=%u\n",
9320 __func__,
9321 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9322 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9323
9324 /* Back channel attributes */
9325 args->bc_attrs.max_rqst_sz = max_bc_payload;
9326 args->bc_attrs.max_resp_sz = max_bc_payload;
9327 args->bc_attrs.max_resp_sz_cached = 0;
9328 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9329 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9330 if (args->bc_attrs.max_reqs > max_bc_slots)
9331 args->bc_attrs.max_reqs = max_bc_slots;
9332
9333 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9334 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9335 __func__,
9336 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9337 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9338 args->bc_attrs.max_reqs);
9339 }
9340
nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9341 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9342 struct nfs41_create_session_res *res)
9343 {
9344 struct nfs4_channel_attrs *sent = &args->fc_attrs;
9345 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9346
9347 if (rcvd->max_resp_sz > sent->max_resp_sz)
9348 return -EINVAL;
9349 /*
9350 * Our requested max_ops is the minimum we need; we're not
9351 * prepared to break up compounds into smaller pieces than that.
9352 * So, no point even trying to continue if the server won't
9353 * cooperate:
9354 */
9355 if (rcvd->max_ops < sent->max_ops)
9356 return -EINVAL;
9357 if (rcvd->max_reqs == 0)
9358 return -EINVAL;
9359 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9360 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9361 return 0;
9362 }
9363
nfs4_verify_back_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9364 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9365 struct nfs41_create_session_res *res)
9366 {
9367 struct nfs4_channel_attrs *sent = &args->bc_attrs;
9368 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9369
9370 if (!(res->flags & SESSION4_BACK_CHAN))
9371 goto out;
9372 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9373 return -EINVAL;
9374 if (rcvd->max_resp_sz < sent->max_resp_sz)
9375 return -EINVAL;
9376 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9377 return -EINVAL;
9378 if (rcvd->max_ops > sent->max_ops)
9379 return -EINVAL;
9380 if (rcvd->max_reqs > sent->max_reqs)
9381 return -EINVAL;
9382 out:
9383 return 0;
9384 }
9385
nfs4_verify_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9386 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9387 struct nfs41_create_session_res *res)
9388 {
9389 int ret;
9390
9391 ret = nfs4_verify_fore_channel_attrs(args, res);
9392 if (ret)
9393 return ret;
9394 return nfs4_verify_back_channel_attrs(args, res);
9395 }
9396
nfs4_update_session(struct nfs4_session * session,struct nfs41_create_session_res * res)9397 static void nfs4_update_session(struct nfs4_session *session,
9398 struct nfs41_create_session_res *res)
9399 {
9400 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9401 /* Mark client id and session as being confirmed */
9402 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9403 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9404 session->flags = res->flags;
9405 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9406 if (res->flags & SESSION4_BACK_CHAN)
9407 memcpy(&session->bc_attrs, &res->bc_attrs,
9408 sizeof(session->bc_attrs));
9409 }
9410
_nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9411 static int _nfs4_proc_create_session(struct nfs_client *clp,
9412 const struct cred *cred)
9413 {
9414 struct nfs4_session *session = clp->cl_session;
9415 struct nfs41_create_session_args args = {
9416 .client = clp,
9417 .clientid = clp->cl_clientid,
9418 .seqid = clp->cl_seqid,
9419 .cb_program = NFS4_CALLBACK,
9420 };
9421 struct nfs41_create_session_res res;
9422
9423 struct rpc_message msg = {
9424 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9425 .rpc_argp = &args,
9426 .rpc_resp = &res,
9427 .rpc_cred = cred,
9428 };
9429 int status;
9430
9431 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9432 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9433
9434 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9435 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9436 trace_nfs4_create_session(clp, status);
9437
9438 switch (status) {
9439 case -NFS4ERR_STALE_CLIENTID:
9440 case -NFS4ERR_DELAY:
9441 case -ETIMEDOUT:
9442 case -EACCES:
9443 case -EAGAIN:
9444 goto out;
9445 }
9446
9447 clp->cl_seqid++;
9448 if (!status) {
9449 /* Verify the session's negotiated channel_attrs values */
9450 status = nfs4_verify_channel_attrs(&args, &res);
9451 /* Increment the clientid slot sequence id */
9452 if (status)
9453 goto out;
9454 nfs4_update_session(session, &res);
9455 }
9456 out:
9457 return status;
9458 }
9459
9460 /*
9461 * Issues a CREATE_SESSION operation to the server.
9462 * It is the responsibility of the caller to verify the session is
9463 * expired before calling this routine.
9464 */
nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9465 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9466 {
9467 int status;
9468 unsigned *ptr;
9469 struct nfs4_session *session = clp->cl_session;
9470 struct nfs4_add_xprt_data xprtdata = {
9471 .clp = clp,
9472 };
9473 struct rpc_add_xprt_test rpcdata = {
9474 .add_xprt_test = clp->cl_mvops->session_trunk,
9475 .data = &xprtdata,
9476 };
9477
9478 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9479
9480 status = _nfs4_proc_create_session(clp, cred);
9481 if (status)
9482 goto out;
9483
9484 /* Init or reset the session slot tables */
9485 status = nfs4_setup_session_slot_tables(session);
9486 dprintk("slot table setup returned %d\n", status);
9487 if (status)
9488 goto out;
9489
9490 ptr = (unsigned *)&session->sess_id.data[0];
9491 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9492 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9493 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9494 out:
9495 return status;
9496 }
9497
9498 /*
9499 * Issue the over-the-wire RPC DESTROY_SESSION.
9500 * The caller must serialize access to this routine.
9501 */
nfs4_proc_destroy_session(struct nfs4_session * session,const struct cred * cred)9502 int nfs4_proc_destroy_session(struct nfs4_session *session,
9503 const struct cred *cred)
9504 {
9505 struct rpc_message msg = {
9506 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9507 .rpc_argp = session,
9508 .rpc_cred = cred,
9509 };
9510 int status = 0;
9511
9512 /* session is still being setup */
9513 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9514 return 0;
9515
9516 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9517 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9518 trace_nfs4_destroy_session(session->clp, status);
9519
9520 if (status)
9521 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9522 "Session has been destroyed regardless...\n", status);
9523 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9524 return status;
9525 }
9526
9527 /*
9528 * Renew the cl_session lease.
9529 */
9530 struct nfs4_sequence_data {
9531 struct nfs_client *clp;
9532 struct nfs4_sequence_args args;
9533 struct nfs4_sequence_res res;
9534 };
9535
nfs41_sequence_release(void * data)9536 static void nfs41_sequence_release(void *data)
9537 {
9538 struct nfs4_sequence_data *calldata = data;
9539 struct nfs_client *clp = calldata->clp;
9540
9541 if (refcount_read(&clp->cl_count) > 1)
9542 nfs4_schedule_state_renewal(clp);
9543 nfs_put_client(clp);
9544 kfree(calldata);
9545 }
9546
nfs41_sequence_handle_errors(struct rpc_task * task,struct nfs_client * clp)9547 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9548 {
9549 switch(task->tk_status) {
9550 case -NFS4ERR_DELAY:
9551 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9552 return -EAGAIN;
9553 default:
9554 nfs4_schedule_lease_recovery(clp);
9555 }
9556 return 0;
9557 }
9558
nfs41_sequence_call_done(struct rpc_task * task,void * data)9559 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9560 {
9561 struct nfs4_sequence_data *calldata = data;
9562 struct nfs_client *clp = calldata->clp;
9563
9564 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9565 return;
9566
9567 trace_nfs4_sequence(clp, task->tk_status);
9568 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9569 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9570 if (refcount_read(&clp->cl_count) == 1)
9571 return;
9572
9573 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9574 rpc_restart_call_prepare(task);
9575 return;
9576 }
9577 }
9578 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9579 }
9580
nfs41_sequence_prepare(struct rpc_task * task,void * data)9581 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9582 {
9583 struct nfs4_sequence_data *calldata = data;
9584 struct nfs_client *clp = calldata->clp;
9585 struct nfs4_sequence_args *args;
9586 struct nfs4_sequence_res *res;
9587
9588 args = task->tk_msg.rpc_argp;
9589 res = task->tk_msg.rpc_resp;
9590
9591 nfs4_setup_sequence(clp, args, res, task);
9592 }
9593
9594 static const struct rpc_call_ops nfs41_sequence_ops = {
9595 .rpc_call_done = nfs41_sequence_call_done,
9596 .rpc_call_prepare = nfs41_sequence_prepare,
9597 .rpc_release = nfs41_sequence_release,
9598 };
9599
_nfs41_proc_sequence(struct nfs_client * clp,const struct cred * cred,struct nfs4_slot * slot,bool is_privileged)9600 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9601 const struct cred *cred,
9602 struct nfs4_slot *slot,
9603 bool is_privileged)
9604 {
9605 struct nfs4_sequence_data *calldata;
9606 struct rpc_message msg = {
9607 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9608 .rpc_cred = cred,
9609 };
9610 struct rpc_task_setup task_setup_data = {
9611 .rpc_client = clp->cl_rpcclient,
9612 .rpc_message = &msg,
9613 .callback_ops = &nfs41_sequence_ops,
9614 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9615 };
9616 struct rpc_task *ret;
9617
9618 ret = ERR_PTR(-EIO);
9619 if (!refcount_inc_not_zero(&clp->cl_count))
9620 goto out_err;
9621
9622 ret = ERR_PTR(-ENOMEM);
9623 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9624 if (calldata == NULL)
9625 goto out_put_clp;
9626 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9627 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9628 msg.rpc_argp = &calldata->args;
9629 msg.rpc_resp = &calldata->res;
9630 calldata->clp = clp;
9631 task_setup_data.callback_data = calldata;
9632
9633 ret = rpc_run_task(&task_setup_data);
9634 if (IS_ERR(ret))
9635 goto out_err;
9636 return ret;
9637 out_put_clp:
9638 nfs_put_client(clp);
9639 out_err:
9640 nfs41_release_slot(slot);
9641 return ret;
9642 }
9643
nfs41_proc_async_sequence(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)9644 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9645 {
9646 struct rpc_task *task;
9647 int ret = 0;
9648
9649 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9650 return -EAGAIN;
9651 task = _nfs41_proc_sequence(clp, cred, NULL, false);
9652 if (IS_ERR(task))
9653 ret = PTR_ERR(task);
9654 else
9655 rpc_put_task_async(task);
9656 dprintk("<-- %s status=%d\n", __func__, ret);
9657 return ret;
9658 }
9659
nfs4_proc_sequence(struct nfs_client * clp,const struct cred * cred)9660 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9661 {
9662 struct rpc_task *task;
9663 int ret;
9664
9665 task = _nfs41_proc_sequence(clp, cred, NULL, true);
9666 if (IS_ERR(task)) {
9667 ret = PTR_ERR(task);
9668 goto out;
9669 }
9670 ret = rpc_wait_for_completion_task(task);
9671 if (!ret)
9672 ret = task->tk_status;
9673 rpc_put_task(task);
9674 out:
9675 dprintk("<-- %s status=%d\n", __func__, ret);
9676 return ret;
9677 }
9678
9679 struct nfs4_reclaim_complete_data {
9680 struct nfs_client *clp;
9681 struct nfs41_reclaim_complete_args arg;
9682 struct nfs41_reclaim_complete_res res;
9683 };
9684
nfs4_reclaim_complete_prepare(struct rpc_task * task,void * data)9685 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9686 {
9687 struct nfs4_reclaim_complete_data *calldata = data;
9688
9689 nfs4_setup_sequence(calldata->clp,
9690 &calldata->arg.seq_args,
9691 &calldata->res.seq_res,
9692 task);
9693 }
9694
nfs41_reclaim_complete_handle_errors(struct rpc_task * task,struct nfs_client * clp)9695 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9696 {
9697 switch(task->tk_status) {
9698 case 0:
9699 wake_up_all(&clp->cl_lock_waitq);
9700 fallthrough;
9701 case -NFS4ERR_COMPLETE_ALREADY:
9702 case -NFS4ERR_WRONG_CRED: /* What to do here? */
9703 break;
9704 case -NFS4ERR_DELAY:
9705 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9706 fallthrough;
9707 case -NFS4ERR_RETRY_UNCACHED_REP:
9708 case -EACCES:
9709 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9710 __func__, task->tk_status, clp->cl_hostname);
9711 return -EAGAIN;
9712 case -NFS4ERR_BADSESSION:
9713 case -NFS4ERR_DEADSESSION:
9714 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9715 break;
9716 default:
9717 nfs4_schedule_lease_recovery(clp);
9718 }
9719 return 0;
9720 }
9721
nfs4_reclaim_complete_done(struct rpc_task * task,void * data)9722 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9723 {
9724 struct nfs4_reclaim_complete_data *calldata = data;
9725 struct nfs_client *clp = calldata->clp;
9726 struct nfs4_sequence_res *res = &calldata->res.seq_res;
9727
9728 if (!nfs41_sequence_done(task, res))
9729 return;
9730
9731 trace_nfs4_reclaim_complete(clp, task->tk_status);
9732 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9733 rpc_restart_call_prepare(task);
9734 return;
9735 }
9736 }
9737
nfs4_free_reclaim_complete_data(void * data)9738 static void nfs4_free_reclaim_complete_data(void *data)
9739 {
9740 struct nfs4_reclaim_complete_data *calldata = data;
9741
9742 kfree(calldata);
9743 }
9744
9745 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9746 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9747 .rpc_call_done = nfs4_reclaim_complete_done,
9748 .rpc_release = nfs4_free_reclaim_complete_data,
9749 };
9750
9751 /*
9752 * Issue a global reclaim complete.
9753 */
nfs41_proc_reclaim_complete(struct nfs_client * clp,const struct cred * cred)9754 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9755 const struct cred *cred)
9756 {
9757 struct nfs4_reclaim_complete_data *calldata;
9758 struct rpc_message msg = {
9759 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9760 .rpc_cred = cred,
9761 };
9762 struct rpc_task_setup task_setup_data = {
9763 .rpc_client = clp->cl_rpcclient,
9764 .rpc_message = &msg,
9765 .callback_ops = &nfs4_reclaim_complete_call_ops,
9766 .flags = RPC_TASK_NO_ROUND_ROBIN,
9767 };
9768 int status = -ENOMEM;
9769
9770 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9771 if (calldata == NULL)
9772 goto out;
9773 calldata->clp = clp;
9774 calldata->arg.one_fs = 0;
9775
9776 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9777 msg.rpc_argp = &calldata->arg;
9778 msg.rpc_resp = &calldata->res;
9779 task_setup_data.callback_data = calldata;
9780 status = nfs4_call_sync_custom(&task_setup_data);
9781 out:
9782 dprintk("<-- %s status=%d\n", __func__, status);
9783 return status;
9784 }
9785
9786 static void
nfs4_layoutget_prepare(struct rpc_task * task,void * calldata)9787 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9788 {
9789 struct nfs4_layoutget *lgp = calldata;
9790 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9791
9792 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9793 &lgp->res.seq_res, task);
9794 }
9795
nfs4_layoutget_done(struct rpc_task * task,void * calldata)9796 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9797 {
9798 struct nfs4_layoutget *lgp = calldata;
9799
9800 nfs41_sequence_process(task, &lgp->res.seq_res);
9801 }
9802
9803 static int
nfs4_layoutget_handle_exception(struct rpc_task * task,struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9804 nfs4_layoutget_handle_exception(struct rpc_task *task,
9805 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9806 {
9807 struct inode *inode = lgp->args.inode;
9808 struct nfs_server *server = NFS_SERVER(inode);
9809 struct pnfs_layout_hdr *lo = lgp->lo;
9810 int nfs4err = task->tk_status;
9811 int err, status = 0;
9812 LIST_HEAD(head);
9813
9814 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9815
9816 nfs4_sequence_free_slot(&lgp->res.seq_res);
9817
9818 exception->state = NULL;
9819 exception->stateid = NULL;
9820
9821 switch (nfs4err) {
9822 case 0:
9823 goto out;
9824
9825 /*
9826 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9827 * on the file. set tk_status to -ENODATA to tell upper layer to
9828 * retry go inband.
9829 */
9830 case -NFS4ERR_LAYOUTUNAVAILABLE:
9831 status = -ENODATA;
9832 goto out;
9833 /*
9834 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9835 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9836 */
9837 case -NFS4ERR_BADLAYOUT:
9838 status = -EOVERFLOW;
9839 goto out;
9840 /*
9841 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9842 * (or clients) writing to the same RAID stripe except when
9843 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9844 *
9845 * Treat it like we would RECALLCONFLICT -- we retry for a little
9846 * while, and then eventually give up.
9847 */
9848 case -NFS4ERR_LAYOUTTRYLATER:
9849 if (lgp->args.minlength == 0) {
9850 status = -EOVERFLOW;
9851 goto out;
9852 }
9853 status = -EBUSY;
9854 break;
9855 case -NFS4ERR_RECALLCONFLICT:
9856 case -NFS4ERR_RETURNCONFLICT:
9857 status = -ERECALLCONFLICT;
9858 break;
9859 case -NFS4ERR_DELEG_REVOKED:
9860 case -NFS4ERR_ADMIN_REVOKED:
9861 case -NFS4ERR_EXPIRED:
9862 case -NFS4ERR_BAD_STATEID:
9863 exception->timeout = 0;
9864 spin_lock(&inode->i_lock);
9865 /* If the open stateid was bad, then recover it. */
9866 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9867 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9868 spin_unlock(&inode->i_lock);
9869 exception->state = lgp->args.ctx->state;
9870 exception->stateid = &lgp->args.stateid;
9871 break;
9872 }
9873
9874 /*
9875 * Mark the bad layout state as invalid, then retry
9876 */
9877 pnfs_mark_layout_stateid_invalid(lo, &head);
9878 spin_unlock(&inode->i_lock);
9879 nfs_commit_inode(inode, 0);
9880 pnfs_free_lseg_list(&head);
9881 status = -EAGAIN;
9882 goto out;
9883 }
9884
9885 err = nfs4_handle_exception(server, nfs4err, exception);
9886 if (!status) {
9887 if (exception->retry)
9888 status = -EAGAIN;
9889 else
9890 status = err;
9891 }
9892 out:
9893 return status;
9894 }
9895
max_response_pages(struct nfs_server * server)9896 size_t max_response_pages(struct nfs_server *server)
9897 {
9898 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9899 return nfs_page_array_len(0, max_resp_sz);
9900 }
9901
nfs4_layoutget_release(void * calldata)9902 static void nfs4_layoutget_release(void *calldata)
9903 {
9904 struct nfs4_layoutget *lgp = calldata;
9905
9906 nfs4_sequence_free_slot(&lgp->res.seq_res);
9907 pnfs_layoutget_free(lgp);
9908 }
9909
9910 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9911 .rpc_call_prepare = nfs4_layoutget_prepare,
9912 .rpc_call_done = nfs4_layoutget_done,
9913 .rpc_release = nfs4_layoutget_release,
9914 };
9915
9916 struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9917 nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
9918 struct nfs4_exception *exception)
9919 {
9920 struct inode *inode = lgp->args.inode;
9921 struct nfs_server *server = NFS_SERVER(inode);
9922 struct rpc_task *task;
9923 struct rpc_message msg = {
9924 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9925 .rpc_argp = &lgp->args,
9926 .rpc_resp = &lgp->res,
9927 .rpc_cred = lgp->cred,
9928 };
9929 struct rpc_task_setup task_setup_data = {
9930 .rpc_client = server->client,
9931 .rpc_message = &msg,
9932 .callback_ops = &nfs4_layoutget_call_ops,
9933 .callback_data = lgp,
9934 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9935 RPC_TASK_MOVEABLE,
9936 };
9937 struct pnfs_layout_segment *lseg = NULL;
9938 int status = 0;
9939
9940 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9941 exception->retry = 0;
9942
9943 task = rpc_run_task(&task_setup_data);
9944 if (IS_ERR(task))
9945 return ERR_CAST(task);
9946
9947 status = rpc_wait_for_completion_task(task);
9948 if (status != 0)
9949 goto out;
9950
9951 if (task->tk_status < 0) {
9952 exception->retry = 1;
9953 status = nfs4_layoutget_handle_exception(task, lgp, exception);
9954 } else if (lgp->res.layoutp->len == 0) {
9955 exception->retry = 1;
9956 status = -EAGAIN;
9957 nfs4_update_delay(&exception->timeout);
9958 } else
9959 lseg = pnfs_layout_process(lgp);
9960 out:
9961 trace_nfs4_layoutget(lgp->args.ctx,
9962 &lgp->args.range,
9963 &lgp->res.range,
9964 &lgp->res.stateid,
9965 status);
9966
9967 rpc_put_task(task);
9968 dprintk("<-- %s status=%d\n", __func__, status);
9969 if (status)
9970 return ERR_PTR(status);
9971 return lseg;
9972 }
9973
9974 static void
nfs4_layoutreturn_prepare(struct rpc_task * task,void * calldata)9975 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9976 {
9977 struct nfs4_layoutreturn *lrp = calldata;
9978
9979 nfs4_setup_sequence(lrp->clp,
9980 &lrp->args.seq_args,
9981 &lrp->res.seq_res,
9982 task);
9983 if (!pnfs_layout_is_valid(lrp->args.layout))
9984 rpc_exit(task, 0);
9985 }
9986
nfs4_layoutreturn_done(struct rpc_task * task,void * calldata)9987 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9988 {
9989 struct nfs4_layoutreturn *lrp = calldata;
9990 struct nfs_server *server;
9991
9992 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9993 return;
9994
9995 if (task->tk_rpc_status == -ETIMEDOUT) {
9996 lrp->rpc_status = -EAGAIN;
9997 lrp->res.lrs_present = 0;
9998 return;
9999 }
10000 /*
10001 * Was there an RPC level error? Assume the call succeeded,
10002 * and that we need to release the layout
10003 */
10004 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
10005 lrp->res.lrs_present = 0;
10006 return;
10007 }
10008
10009 server = NFS_SERVER(lrp->args.inode);
10010 switch (task->tk_status) {
10011 case -NFS4ERR_OLD_STATEID:
10012 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
10013 &lrp->args.range,
10014 lrp->args.inode))
10015 goto out_restart;
10016 fallthrough;
10017 default:
10018 task->tk_status = 0;
10019 lrp->res.lrs_present = 0;
10020 fallthrough;
10021 case 0:
10022 break;
10023 case -NFS4ERR_BADSESSION:
10024 case -NFS4ERR_DEADSESSION:
10025 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10026 nfs4_schedule_session_recovery(server->nfs_client->cl_session,
10027 task->tk_status);
10028 lrp->res.lrs_present = 0;
10029 lrp->rpc_status = -EAGAIN;
10030 task->tk_status = 0;
10031 break;
10032 case -NFS4ERR_DELAY:
10033 if (nfs4_async_handle_error(task, server, NULL, NULL) ==
10034 -EAGAIN)
10035 goto out_restart;
10036 lrp->res.lrs_present = 0;
10037 break;
10038 }
10039 return;
10040 out_restart:
10041 task->tk_status = 0;
10042 nfs4_sequence_free_slot(&lrp->res.seq_res);
10043 rpc_restart_call_prepare(task);
10044 }
10045
nfs4_layoutreturn_release(void * calldata)10046 static void nfs4_layoutreturn_release(void *calldata)
10047 {
10048 struct nfs4_layoutreturn *lrp = calldata;
10049 struct pnfs_layout_hdr *lo = lrp->args.layout;
10050
10051 if (lrp->rpc_status == 0 || !lrp->inode)
10052 pnfs_layoutreturn_free_lsegs(
10053 lo, &lrp->args.stateid, &lrp->args.range,
10054 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
10055 else
10056 pnfs_layoutreturn_retry_later(lo, &lrp->args.stateid,
10057 &lrp->args.range);
10058 nfs4_sequence_free_slot(&lrp->res.seq_res);
10059 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
10060 lrp->ld_private.ops->free(&lrp->ld_private);
10061 pnfs_put_layout_hdr(lrp->args.layout);
10062 nfs_iput_and_deactive(lrp->inode);
10063 put_cred(lrp->cred);
10064 kfree(calldata);
10065 }
10066
10067 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
10068 .rpc_call_prepare = nfs4_layoutreturn_prepare,
10069 .rpc_call_done = nfs4_layoutreturn_done,
10070 .rpc_release = nfs4_layoutreturn_release,
10071 };
10072
nfs4_proc_layoutreturn(struct nfs4_layoutreturn * lrp,unsigned int flags)10073 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, unsigned int flags)
10074 {
10075 struct rpc_task *task;
10076 struct rpc_message msg = {
10077 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
10078 .rpc_argp = &lrp->args,
10079 .rpc_resp = &lrp->res,
10080 .rpc_cred = lrp->cred,
10081 };
10082 struct rpc_task_setup task_setup_data = {
10083 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
10084 .rpc_message = &msg,
10085 .callback_ops = &nfs4_layoutreturn_call_ops,
10086 .callback_data = lrp,
10087 .flags = RPC_TASK_MOVEABLE,
10088 };
10089 int status = 0;
10090
10091 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
10092 NFS_SP4_MACH_CRED_PNFS_CLEANUP,
10093 &task_setup_data.rpc_client, &msg);
10094
10095 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
10096 if (flags & PNFS_FL_LAYOUTRETURN_ASYNC) {
10097 if (!lrp->inode) {
10098 nfs4_layoutreturn_release(lrp);
10099 return -EAGAIN;
10100 }
10101 task_setup_data.flags |= RPC_TASK_ASYNC;
10102 }
10103 if (!lrp->inode)
10104 flags |= PNFS_FL_LAYOUTRETURN_PRIVILEGED;
10105 if (flags & PNFS_FL_LAYOUTRETURN_PRIVILEGED)
10106 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
10107 1);
10108 else
10109 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
10110 0);
10111 task = rpc_run_task(&task_setup_data);
10112 if (IS_ERR(task))
10113 return PTR_ERR(task);
10114 if (!(flags & PNFS_FL_LAYOUTRETURN_ASYNC))
10115 status = task->tk_status;
10116 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
10117 dprintk("<-- %s status=%d\n", __func__, status);
10118 rpc_put_task(task);
10119 return status;
10120 }
10121
10122 static int
_nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)10123 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
10124 struct pnfs_device *pdev,
10125 const struct cred *cred)
10126 {
10127 struct nfs4_getdeviceinfo_args args = {
10128 .pdev = pdev,
10129 .notify_types = NOTIFY_DEVICEID4_CHANGE |
10130 NOTIFY_DEVICEID4_DELETE,
10131 };
10132 struct nfs4_getdeviceinfo_res res = {
10133 .pdev = pdev,
10134 };
10135 struct rpc_message msg = {
10136 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
10137 .rpc_argp = &args,
10138 .rpc_resp = &res,
10139 .rpc_cred = cred,
10140 };
10141 int status;
10142
10143 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
10144 if (res.notification & ~args.notify_types)
10145 dprintk("%s: unsupported notification\n", __func__);
10146 if (res.notification != args.notify_types)
10147 pdev->nocache = 1;
10148
10149 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
10150
10151 dprintk("<-- %s status=%d\n", __func__, status);
10152
10153 return status;
10154 }
10155
nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)10156 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
10157 struct pnfs_device *pdev,
10158 const struct cred *cred)
10159 {
10160 struct nfs4_exception exception = { };
10161 int err;
10162
10163 do {
10164 err = nfs4_handle_exception(server,
10165 _nfs4_proc_getdeviceinfo(server, pdev, cred),
10166 &exception);
10167 } while (exception.retry);
10168 return err;
10169 }
10170 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
10171
nfs4_layoutcommit_prepare(struct rpc_task * task,void * calldata)10172 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
10173 {
10174 struct nfs4_layoutcommit_data *data = calldata;
10175 struct nfs_server *server = NFS_SERVER(data->args.inode);
10176
10177 nfs4_setup_sequence(server->nfs_client,
10178 &data->args.seq_args,
10179 &data->res.seq_res,
10180 task);
10181 }
10182
10183 static void
nfs4_layoutcommit_done(struct rpc_task * task,void * calldata)10184 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
10185 {
10186 struct nfs4_layoutcommit_data *data = calldata;
10187 struct nfs_server *server = NFS_SERVER(data->args.inode);
10188
10189 if (!nfs41_sequence_done(task, &data->res.seq_res))
10190 return;
10191
10192 switch (task->tk_status) { /* Just ignore these failures */
10193 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
10194 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
10195 case -NFS4ERR_BADLAYOUT: /* no layout */
10196 case -NFS4ERR_GRACE: /* loca_recalim always false */
10197 task->tk_status = 0;
10198 break;
10199 case 0:
10200 break;
10201 default:
10202 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10203 rpc_restart_call_prepare(task);
10204 return;
10205 }
10206 }
10207 }
10208
nfs4_layoutcommit_release(void * calldata)10209 static void nfs4_layoutcommit_release(void *calldata)
10210 {
10211 struct nfs4_layoutcommit_data *data = calldata;
10212
10213 pnfs_cleanup_layoutcommit(data);
10214 nfs_post_op_update_inode_force_wcc(data->args.inode,
10215 data->res.fattr);
10216 put_cred(data->cred);
10217 nfs_iput_and_deactive(data->inode);
10218 kfree(data);
10219 }
10220
10221 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10222 .rpc_call_prepare = nfs4_layoutcommit_prepare,
10223 .rpc_call_done = nfs4_layoutcommit_done,
10224 .rpc_release = nfs4_layoutcommit_release,
10225 };
10226
10227 int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data * data,bool sync)10228 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10229 {
10230 struct rpc_message msg = {
10231 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10232 .rpc_argp = &data->args,
10233 .rpc_resp = &data->res,
10234 .rpc_cred = data->cred,
10235 };
10236 struct rpc_task_setup task_setup_data = {
10237 .task = &data->task,
10238 .rpc_client = NFS_CLIENT(data->args.inode),
10239 .rpc_message = &msg,
10240 .callback_ops = &nfs4_layoutcommit_ops,
10241 .callback_data = data,
10242 .flags = RPC_TASK_MOVEABLE,
10243 };
10244 struct rpc_task *task;
10245 int status = 0;
10246
10247 dprintk("NFS: initiating layoutcommit call. sync %d "
10248 "lbw: %llu inode %lu\n", sync,
10249 data->args.lastbytewritten,
10250 data->args.inode->i_ino);
10251
10252 if (!sync) {
10253 data->inode = nfs_igrab_and_active(data->args.inode);
10254 if (data->inode == NULL) {
10255 nfs4_layoutcommit_release(data);
10256 return -EAGAIN;
10257 }
10258 task_setup_data.flags = RPC_TASK_ASYNC;
10259 }
10260 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10261 task = rpc_run_task(&task_setup_data);
10262 if (IS_ERR(task))
10263 return PTR_ERR(task);
10264 if (sync)
10265 status = task->tk_status;
10266 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10267 dprintk("%s: status %d\n", __func__, status);
10268 rpc_put_task(task);
10269 return status;
10270 }
10271
10272 /*
10273 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10274 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10275 */
10276 static int
_nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors,bool use_integrity)10277 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10278 struct nfs_fsinfo *info,
10279 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10280 {
10281 struct nfs41_secinfo_no_name_args args = {
10282 .style = SECINFO_STYLE_CURRENT_FH,
10283 };
10284 struct nfs4_secinfo_res res = {
10285 .flavors = flavors,
10286 };
10287 struct rpc_message msg = {
10288 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10289 .rpc_argp = &args,
10290 .rpc_resp = &res,
10291 };
10292 struct nfs4_call_sync_data data = {
10293 .seq_server = server,
10294 .seq_args = &args.seq_args,
10295 .seq_res = &res.seq_res,
10296 };
10297 struct rpc_task_setup task_setup = {
10298 .rpc_client = server->client,
10299 .rpc_message = &msg,
10300 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10301 .callback_data = &data,
10302 .flags = RPC_TASK_NO_ROUND_ROBIN,
10303 };
10304 const struct cred *cred = NULL;
10305 int status;
10306
10307 if (use_integrity) {
10308 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10309
10310 cred = nfs4_get_clid_cred(server->nfs_client);
10311 msg.rpc_cred = cred;
10312 }
10313
10314 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10315 status = nfs4_call_sync_custom(&task_setup);
10316 dprintk("<-- %s status=%d\n", __func__, status);
10317
10318 put_cred(cred);
10319
10320 return status;
10321 }
10322
10323 static int
nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors)10324 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10325 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10326 {
10327 struct nfs4_exception exception = {
10328 .interruptible = true,
10329 };
10330 int err;
10331 do {
10332 /* first try using integrity protection */
10333 err = -NFS4ERR_WRONGSEC;
10334
10335 /* try to use integrity protection with machine cred */
10336 if (_nfs4_is_integrity_protected(server->nfs_client))
10337 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10338 flavors, true);
10339
10340 /*
10341 * if unable to use integrity protection, or SECINFO with
10342 * integrity protection returns NFS4ERR_WRONGSEC (which is
10343 * disallowed by spec, but exists in deployed servers) use
10344 * the current filesystem's rpc_client and the user cred.
10345 */
10346 if (err == -NFS4ERR_WRONGSEC)
10347 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10348 flavors, false);
10349
10350 switch (err) {
10351 case 0:
10352 case -NFS4ERR_WRONGSEC:
10353 case -ENOTSUPP:
10354 goto out;
10355 default:
10356 err = nfs4_handle_exception(server, err, &exception);
10357 }
10358 } while (exception.retry);
10359 out:
10360 return err;
10361 }
10362
10363 static int
nfs41_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)10364 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10365 struct nfs_fsinfo *info)
10366 {
10367 int err;
10368 struct page *page;
10369 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10370 struct nfs4_secinfo_flavors *flavors;
10371 struct nfs4_secinfo4 *secinfo;
10372 int i;
10373
10374 page = alloc_page(GFP_KERNEL);
10375 if (!page) {
10376 err = -ENOMEM;
10377 goto out;
10378 }
10379
10380 flavors = page_address(page);
10381 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10382
10383 /*
10384 * Fall back on "guess and check" method if
10385 * the server doesn't support SECINFO_NO_NAME
10386 */
10387 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10388 err = nfs4_find_root_sec(server, fhandle, info);
10389 goto out_freepage;
10390 }
10391 if (err)
10392 goto out_freepage;
10393
10394 for (i = 0; i < flavors->num_flavors; i++) {
10395 secinfo = &flavors->flavors[i];
10396
10397 switch (secinfo->flavor) {
10398 case RPC_AUTH_NULL:
10399 case RPC_AUTH_UNIX:
10400 case RPC_AUTH_GSS:
10401 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10402 &secinfo->flavor_info);
10403 break;
10404 default:
10405 flavor = RPC_AUTH_MAXFLAVOR;
10406 break;
10407 }
10408
10409 if (!nfs_auth_info_match(&server->auth_info, flavor))
10410 flavor = RPC_AUTH_MAXFLAVOR;
10411
10412 if (flavor != RPC_AUTH_MAXFLAVOR) {
10413 err = nfs4_lookup_root_sec(server, fhandle,
10414 info, flavor);
10415 if (!err)
10416 break;
10417 }
10418 }
10419
10420 if (flavor == RPC_AUTH_MAXFLAVOR)
10421 err = -EPERM;
10422
10423 out_freepage:
10424 put_page(page);
10425 if (err == -EACCES)
10426 return -EPERM;
10427 out:
10428 return err;
10429 }
10430
_nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10431 static int _nfs41_test_stateid(struct nfs_server *server,
10432 const nfs4_stateid *stateid,
10433 const struct cred *cred)
10434 {
10435 int status;
10436 struct nfs41_test_stateid_args args = {
10437 .stateid = *stateid,
10438 };
10439 struct nfs41_test_stateid_res res;
10440 struct rpc_message msg = {
10441 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10442 .rpc_argp = &args,
10443 .rpc_resp = &res,
10444 .rpc_cred = cred,
10445 };
10446 struct rpc_clnt *rpc_client = server->client;
10447
10448 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10449 &rpc_client, &msg);
10450
10451 dprintk("NFS call test_stateid %p\n", stateid);
10452 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10453 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10454 &args.seq_args, &res.seq_res);
10455 if (status != NFS_OK) {
10456 dprintk("NFS reply test_stateid: failed, %d\n", status);
10457 return status;
10458 }
10459 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10460 return -res.status;
10461 }
10462
nfs4_handle_delay_or_session_error(struct nfs_server * server,int err,struct nfs4_exception * exception)10463 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10464 int err, struct nfs4_exception *exception)
10465 {
10466 exception->retry = 0;
10467 switch(err) {
10468 case -NFS4ERR_DELAY:
10469 case -NFS4ERR_RETRY_UNCACHED_REP:
10470 nfs4_handle_exception(server, err, exception);
10471 break;
10472 case -NFS4ERR_BADSESSION:
10473 case -NFS4ERR_BADSLOT:
10474 case -NFS4ERR_BAD_HIGH_SLOT:
10475 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10476 case -NFS4ERR_DEADSESSION:
10477 nfs4_do_handle_exception(server, err, exception);
10478 }
10479 }
10480
10481 /**
10482 * nfs41_test_stateid - perform a TEST_STATEID operation
10483 *
10484 * @server: server / transport on which to perform the operation
10485 * @stateid: state ID to test
10486 * @cred: credential
10487 *
10488 * Returns NFS_OK if the server recognizes that "stateid" is valid.
10489 * Otherwise a negative NFS4ERR value is returned if the operation
10490 * failed or the state ID is not currently valid.
10491 */
nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10492 static int nfs41_test_stateid(struct nfs_server *server,
10493 const nfs4_stateid *stateid,
10494 const struct cred *cred)
10495 {
10496 struct nfs4_exception exception = {
10497 .interruptible = true,
10498 };
10499 int err;
10500 do {
10501 err = _nfs41_test_stateid(server, stateid, cred);
10502 nfs4_handle_delay_or_session_error(server, err, &exception);
10503 } while (exception.retry);
10504 return err;
10505 }
10506
10507 struct nfs_free_stateid_data {
10508 struct nfs_server *server;
10509 struct nfs41_free_stateid_args args;
10510 struct nfs41_free_stateid_res res;
10511 };
10512
nfs41_free_stateid_prepare(struct rpc_task * task,void * calldata)10513 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10514 {
10515 struct nfs_free_stateid_data *data = calldata;
10516 nfs4_setup_sequence(data->server->nfs_client,
10517 &data->args.seq_args,
10518 &data->res.seq_res,
10519 task);
10520 }
10521
nfs41_free_stateid_done(struct rpc_task * task,void * calldata)10522 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10523 {
10524 struct nfs_free_stateid_data *data = calldata;
10525
10526 nfs41_sequence_done(task, &data->res.seq_res);
10527
10528 switch (task->tk_status) {
10529 case -NFS4ERR_DELAY:
10530 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10531 rpc_restart_call_prepare(task);
10532 }
10533 }
10534
nfs41_free_stateid_release(void * calldata)10535 static void nfs41_free_stateid_release(void *calldata)
10536 {
10537 struct nfs_free_stateid_data *data = calldata;
10538 struct nfs_client *clp = data->server->nfs_client;
10539
10540 nfs_put_client(clp);
10541 kfree(calldata);
10542 }
10543
10544 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10545 .rpc_call_prepare = nfs41_free_stateid_prepare,
10546 .rpc_call_done = nfs41_free_stateid_done,
10547 .rpc_release = nfs41_free_stateid_release,
10548 };
10549
10550 /**
10551 * nfs41_free_stateid - perform a FREE_STATEID operation
10552 *
10553 * @server: server / transport on which to perform the operation
10554 * @stateid: state ID to release
10555 * @cred: credential
10556 * @privileged: set to true if this call needs to be privileged
10557 *
10558 * Note: this function is always asynchronous.
10559 */
nfs41_free_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred,bool privileged)10560 static int nfs41_free_stateid(struct nfs_server *server,
10561 const nfs4_stateid *stateid,
10562 const struct cred *cred,
10563 bool privileged)
10564 {
10565 struct rpc_message msg = {
10566 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10567 .rpc_cred = cred,
10568 };
10569 struct rpc_task_setup task_setup = {
10570 .rpc_client = server->client,
10571 .rpc_message = &msg,
10572 .callback_ops = &nfs41_free_stateid_ops,
10573 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10574 };
10575 struct nfs_free_stateid_data *data;
10576 struct rpc_task *task;
10577 struct nfs_client *clp = server->nfs_client;
10578
10579 if (!refcount_inc_not_zero(&clp->cl_count))
10580 return -EIO;
10581
10582 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10583 &task_setup.rpc_client, &msg);
10584
10585 dprintk("NFS call free_stateid %p\n", stateid);
10586 data = kmalloc(sizeof(*data), GFP_KERNEL);
10587 if (!data)
10588 return -ENOMEM;
10589 data->server = server;
10590 nfs4_stateid_copy(&data->args.stateid, stateid);
10591
10592 task_setup.callback_data = data;
10593
10594 msg.rpc_argp = &data->args;
10595 msg.rpc_resp = &data->res;
10596 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10597 task = rpc_run_task(&task_setup);
10598 if (IS_ERR(task))
10599 return PTR_ERR(task);
10600 rpc_put_task(task);
10601 return 0;
10602 }
10603
10604 static void
nfs41_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)10605 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10606 {
10607 const struct cred *cred = lsp->ls_state->owner->so_cred;
10608
10609 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10610 nfs4_free_lock_state(server, lsp);
10611 }
10612
nfs41_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10613 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10614 const nfs4_stateid *s2)
10615 {
10616 if (s1->type != s2->type)
10617 return false;
10618
10619 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10620 return false;
10621
10622 if (s1->seqid == s2->seqid)
10623 return true;
10624
10625 return s1->seqid == 0 || s2->seqid == 0;
10626 }
10627
10628 #endif /* CONFIG_NFS_V4_1 */
10629
nfs4_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10630 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10631 const nfs4_stateid *s2)
10632 {
10633 return nfs4_stateid_match(s1, s2);
10634 }
10635
10636
10637 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10638 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10639 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10640 .recover_open = nfs4_open_reclaim,
10641 .recover_lock = nfs4_lock_reclaim,
10642 .establish_clid = nfs4_init_clientid,
10643 .detect_trunking = nfs40_discover_server_trunking,
10644 };
10645
10646 #if defined(CONFIG_NFS_V4_1)
10647 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10648 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10649 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10650 .recover_open = nfs4_open_reclaim,
10651 .recover_lock = nfs4_lock_reclaim,
10652 .establish_clid = nfs41_init_clientid,
10653 .reclaim_complete = nfs41_proc_reclaim_complete,
10654 .detect_trunking = nfs41_discover_server_trunking,
10655 };
10656 #endif /* CONFIG_NFS_V4_1 */
10657
10658 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10659 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10660 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10661 .recover_open = nfs40_open_expired,
10662 .recover_lock = nfs4_lock_expired,
10663 .establish_clid = nfs4_init_clientid,
10664 };
10665
10666 #if defined(CONFIG_NFS_V4_1)
10667 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10668 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10669 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10670 .recover_open = nfs41_open_expired,
10671 .recover_lock = nfs41_lock_expired,
10672 .establish_clid = nfs41_init_clientid,
10673 };
10674 #endif /* CONFIG_NFS_V4_1 */
10675
10676 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10677 .sched_state_renewal = nfs4_proc_async_renew,
10678 .get_state_renewal_cred = nfs4_get_renew_cred,
10679 .renew_lease = nfs4_proc_renew,
10680 };
10681
10682 #if defined(CONFIG_NFS_V4_1)
10683 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10684 .sched_state_renewal = nfs41_proc_async_sequence,
10685 .get_state_renewal_cred = nfs4_get_machine_cred,
10686 .renew_lease = nfs4_proc_sequence,
10687 };
10688 #endif
10689
10690 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10691 .get_locations = _nfs40_proc_get_locations,
10692 .fsid_present = _nfs40_proc_fsid_present,
10693 };
10694
10695 #if defined(CONFIG_NFS_V4_1)
10696 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10697 .get_locations = _nfs41_proc_get_locations,
10698 .fsid_present = _nfs41_proc_fsid_present,
10699 };
10700 #endif /* CONFIG_NFS_V4_1 */
10701
10702 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10703 .minor_version = 0,
10704 .init_caps = NFS_CAP_READDIRPLUS
10705 | NFS_CAP_ATOMIC_OPEN
10706 | NFS_CAP_POSIX_LOCK,
10707 .init_client = nfs40_init_client,
10708 .shutdown_client = nfs40_shutdown_client,
10709 .match_stateid = nfs4_match_stateid,
10710 .find_root_sec = nfs4_find_root_sec,
10711 .free_lock_state = nfs4_release_lockowner,
10712 .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10713 .alloc_seqid = nfs_alloc_seqid,
10714 .call_sync_ops = &nfs40_call_sync_ops,
10715 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10716 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10717 .state_renewal_ops = &nfs40_state_renewal_ops,
10718 .mig_recovery_ops = &nfs40_mig_recovery_ops,
10719 };
10720
10721 #if defined(CONFIG_NFS_V4_1)
10722 static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter * arg1,gfp_t arg2)10723 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10724 {
10725 return NULL;
10726 }
10727
10728 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10729 .minor_version = 1,
10730 .init_caps = NFS_CAP_READDIRPLUS
10731 | NFS_CAP_ATOMIC_OPEN
10732 | NFS_CAP_POSIX_LOCK
10733 | NFS_CAP_STATEID_NFSV41
10734 | NFS_CAP_ATOMIC_OPEN_V1
10735 | NFS_CAP_LGOPEN
10736 | NFS_CAP_MOVEABLE,
10737 .init_client = nfs41_init_client,
10738 .shutdown_client = nfs41_shutdown_client,
10739 .match_stateid = nfs41_match_stateid,
10740 .find_root_sec = nfs41_find_root_sec,
10741 .free_lock_state = nfs41_free_lock_state,
10742 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10743 .alloc_seqid = nfs_alloc_no_seqid,
10744 .session_trunk = nfs4_test_session_trunk,
10745 .call_sync_ops = &nfs41_call_sync_ops,
10746 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10747 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10748 .state_renewal_ops = &nfs41_state_renewal_ops,
10749 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10750 };
10751 #endif
10752
10753 #if defined(CONFIG_NFS_V4_2)
10754 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10755 .minor_version = 2,
10756 .init_caps = NFS_CAP_READDIRPLUS
10757 | NFS_CAP_ATOMIC_OPEN
10758 | NFS_CAP_POSIX_LOCK
10759 | NFS_CAP_STATEID_NFSV41
10760 | NFS_CAP_ATOMIC_OPEN_V1
10761 | NFS_CAP_LGOPEN
10762 | NFS_CAP_ALLOCATE
10763 | NFS_CAP_COPY
10764 | NFS_CAP_OFFLOAD_CANCEL
10765 | NFS_CAP_COPY_NOTIFY
10766 | NFS_CAP_DEALLOCATE
10767 | NFS_CAP_SEEK
10768 | NFS_CAP_LAYOUTSTATS
10769 | NFS_CAP_CLONE
10770 | NFS_CAP_LAYOUTERROR
10771 | NFS_CAP_READ_PLUS
10772 | NFS_CAP_MOVEABLE,
10773 .init_client = nfs41_init_client,
10774 .shutdown_client = nfs41_shutdown_client,
10775 .match_stateid = nfs41_match_stateid,
10776 .find_root_sec = nfs41_find_root_sec,
10777 .free_lock_state = nfs41_free_lock_state,
10778 .call_sync_ops = &nfs41_call_sync_ops,
10779 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10780 .alloc_seqid = nfs_alloc_no_seqid,
10781 .session_trunk = nfs4_test_session_trunk,
10782 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10783 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10784 .state_renewal_ops = &nfs41_state_renewal_ops,
10785 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10786 };
10787 #endif
10788
10789 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10790 [0] = &nfs_v4_0_minor_ops,
10791 #if defined(CONFIG_NFS_V4_1)
10792 [1] = &nfs_v4_1_minor_ops,
10793 #endif
10794 #if defined(CONFIG_NFS_V4_2)
10795 [2] = &nfs_v4_2_minor_ops,
10796 #endif
10797 };
10798
nfs4_listxattr(struct dentry * dentry,char * list,size_t size)10799 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10800 {
10801 ssize_t error, error2, error3;
10802 size_t left = size;
10803
10804 error = generic_listxattr(dentry, list, left);
10805 if (error < 0)
10806 return error;
10807 if (list) {
10808 list += error;
10809 left -= error;
10810 }
10811
10812 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left);
10813 if (error2 < 0)
10814 return error2;
10815
10816 if (list) {
10817 list += error2;
10818 left -= error2;
10819 }
10820
10821 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10822 if (error3 < 0)
10823 return error3;
10824
10825 error += error2 + error3;
10826 if (size && error > size)
10827 return -ERANGE;
10828 return error;
10829 }
10830
nfs4_enable_swap(struct inode * inode)10831 static void nfs4_enable_swap(struct inode *inode)
10832 {
10833 /* The state manager thread must always be running.
10834 * It will notice the client is a swapper, and stay put.
10835 */
10836 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10837
10838 nfs4_schedule_state_manager(clp);
10839 }
10840
nfs4_disable_swap(struct inode * inode)10841 static void nfs4_disable_swap(struct inode *inode)
10842 {
10843 /* The state manager thread will now exit once it is
10844 * woken.
10845 */
10846 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10847
10848 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10849 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10850 wake_up_var(&clp->cl_state);
10851 }
10852
10853 static const struct inode_operations nfs4_dir_inode_operations = {
10854 .create = nfs_create,
10855 .lookup = nfs_lookup,
10856 .atomic_open = nfs_atomic_open,
10857 .link = nfs_link,
10858 .unlink = nfs_unlink,
10859 .symlink = nfs_symlink,
10860 .mkdir = nfs_mkdir,
10861 .rmdir = nfs_rmdir,
10862 .mknod = nfs_mknod,
10863 .rename = nfs_rename,
10864 .permission = nfs_permission,
10865 .getattr = nfs_getattr,
10866 .setattr = nfs_setattr,
10867 .listxattr = nfs4_listxattr,
10868 };
10869
10870 static const struct inode_operations nfs4_file_inode_operations = {
10871 .permission = nfs_permission,
10872 .getattr = nfs_getattr,
10873 .setattr = nfs_setattr,
10874 .listxattr = nfs4_listxattr,
10875 };
10876
10877 const struct nfs_rpc_ops nfs_v4_clientops = {
10878 .version = 4, /* protocol version */
10879 .dentry_ops = &nfs4_dentry_operations,
10880 .dir_inode_ops = &nfs4_dir_inode_operations,
10881 .file_inode_ops = &nfs4_file_inode_operations,
10882 .file_ops = &nfs4_file_operations,
10883 .getroot = nfs4_proc_get_root,
10884 .submount = nfs4_submount,
10885 .try_get_tree = nfs4_try_get_tree,
10886 .getattr = nfs4_proc_getattr,
10887 .setattr = nfs4_proc_setattr,
10888 .lookup = nfs4_proc_lookup,
10889 .lookupp = nfs4_proc_lookupp,
10890 .access = nfs4_proc_access,
10891 .readlink = nfs4_proc_readlink,
10892 .create = nfs4_proc_create,
10893 .remove = nfs4_proc_remove,
10894 .unlink_setup = nfs4_proc_unlink_setup,
10895 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10896 .unlink_done = nfs4_proc_unlink_done,
10897 .rename_setup = nfs4_proc_rename_setup,
10898 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10899 .rename_done = nfs4_proc_rename_done,
10900 .link = nfs4_proc_link,
10901 .symlink = nfs4_proc_symlink,
10902 .mkdir = nfs4_proc_mkdir,
10903 .rmdir = nfs4_proc_rmdir,
10904 .readdir = nfs4_proc_readdir,
10905 .mknod = nfs4_proc_mknod,
10906 .statfs = nfs4_proc_statfs,
10907 .fsinfo = nfs4_proc_fsinfo,
10908 .pathconf = nfs4_proc_pathconf,
10909 .set_capabilities = nfs4_server_capabilities,
10910 .decode_dirent = nfs4_decode_dirent,
10911 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10912 .read_setup = nfs4_proc_read_setup,
10913 .read_done = nfs4_read_done,
10914 .write_setup = nfs4_proc_write_setup,
10915 .write_done = nfs4_write_done,
10916 .commit_setup = nfs4_proc_commit_setup,
10917 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10918 .commit_done = nfs4_commit_done,
10919 .lock = nfs4_proc_lock,
10920 .clear_acl_cache = nfs4_zap_acl_attr,
10921 .close_context = nfs4_close_context,
10922 .open_context = nfs4_atomic_open,
10923 .have_delegation = nfs4_have_delegation,
10924 .return_delegation = nfs4_inode_return_delegation,
10925 .alloc_client = nfs4_alloc_client,
10926 .init_client = nfs4_init_client,
10927 .free_client = nfs4_free_client,
10928 .create_server = nfs4_create_server,
10929 .clone_server = nfs_clone_server,
10930 .discover_trunking = nfs4_discover_trunking,
10931 .enable_swap = nfs4_enable_swap,
10932 .disable_swap = nfs4_disable_swap,
10933 };
10934
10935 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10936 .name = XATTR_NAME_NFSV4_ACL,
10937 .list = nfs4_xattr_list_nfs4_acl,
10938 .get = nfs4_xattr_get_nfs4_acl,
10939 .set = nfs4_xattr_set_nfs4_acl,
10940 };
10941
10942 #if defined(CONFIG_NFS_V4_1)
10943 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10944 .name = XATTR_NAME_NFSV4_DACL,
10945 .list = nfs4_xattr_list_nfs4_dacl,
10946 .get = nfs4_xattr_get_nfs4_dacl,
10947 .set = nfs4_xattr_set_nfs4_dacl,
10948 };
10949
10950 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10951 .name = XATTR_NAME_NFSV4_SACL,
10952 .list = nfs4_xattr_list_nfs4_sacl,
10953 .get = nfs4_xattr_get_nfs4_sacl,
10954 .set = nfs4_xattr_set_nfs4_sacl,
10955 };
10956 #endif
10957
10958 #ifdef CONFIG_NFS_V4_2
10959 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10960 .prefix = XATTR_USER_PREFIX,
10961 .get = nfs4_xattr_get_nfs4_user,
10962 .set = nfs4_xattr_set_nfs4_user,
10963 };
10964 #endif
10965
10966 const struct xattr_handler * const nfs4_xattr_handlers[] = {
10967 &nfs4_xattr_nfs4_acl_handler,
10968 #if defined(CONFIG_NFS_V4_1)
10969 &nfs4_xattr_nfs4_dacl_handler,
10970 &nfs4_xattr_nfs4_sacl_handler,
10971 #endif
10972 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10973 &nfs4_xattr_nfs4_label_handler,
10974 #endif
10975 #ifdef CONFIG_NFS_V4_2
10976 &nfs4_xattr_nfs4_user_handler,
10977 #endif
10978 NULL
10979 };
10980