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 "nfs40.h"
71 #include "nfs42.h"
72
73 #include "nfs4trace.h"
74
75 #define NFSDBG_FACILITY NFSDBG_PROC
76
77 #define NFS4_BITMASK_SZ 3
78
79 #define NFS4_POLL_RETRY_MIN (HZ/10)
80 #define NFS4_POLL_RETRY_MAX (15*HZ)
81
82 /* file attributes which can be mapped to nfs attributes */
83 #define NFS4_VALID_ATTRS (ATTR_MODE \
84 | ATTR_UID \
85 | ATTR_GID \
86 | ATTR_SIZE \
87 | ATTR_ATIME \
88 | ATTR_MTIME \
89 | ATTR_CTIME \
90 | ATTR_ATIME_SET \
91 | ATTR_MTIME_SET)
92
93 struct nfs4_opendata;
94 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
95 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
96 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
97 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
98 struct nfs_fattr *fattr, struct inode *inode);
99 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
100 struct nfs_fattr *fattr, struct iattr *sattr,
101 struct nfs_open_context *ctx, struct nfs4_label *ilabel);
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 *, nfs4_stateid *,
109 const struct cred *, bool);
110
111 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
112 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)113 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
114 struct iattr *sattr, struct nfs4_label *label)
115 {
116 struct lsm_context shim;
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, &shim);
132 if (err)
133 return NULL;
134
135 label->lsmid = shim.id;
136 label->label = shim.context;
137 label->len = shim.len;
138 return label;
139 }
140 static inline void
nfs4_label_release_security(struct nfs4_label * label)141 nfs4_label_release_security(struct nfs4_label *label)
142 {
143 struct lsm_context shim;
144
145 if (label) {
146 shim.context = label->label;
147 shim.len = label->len;
148 shim.id = label->lsmid;
149 security_release_secctx(&shim);
150 }
151 }
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)152 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
153 {
154 if (label)
155 return server->attr_bitmask;
156
157 return server->attr_bitmask_nl;
158 }
159 #else
160 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * l)161 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
162 struct iattr *sattr, struct nfs4_label *l)
163 { return NULL; }
164 static inline void
nfs4_label_release_security(struct nfs4_label * label)165 nfs4_label_release_security(struct nfs4_label *label)
166 { return; }
167 static inline u32 *
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)168 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
169 { return server->attr_bitmask; }
170 #endif
171
172 /* Prevent leaks of NFSv4 errors into userland */
nfs4_map_errors(int err)173 static int nfs4_map_errors(int err)
174 {
175 if (err >= -1000)
176 return err;
177 switch (err) {
178 case -NFS4ERR_RESOURCE:
179 case -NFS4ERR_LAYOUTTRYLATER:
180 case -NFS4ERR_RECALLCONFLICT:
181 case -NFS4ERR_RETURNCONFLICT:
182 return -EREMOTEIO;
183 case -NFS4ERR_WRONGSEC:
184 case -NFS4ERR_WRONG_CRED:
185 return -EPERM;
186 case -NFS4ERR_BADOWNER:
187 case -NFS4ERR_BADNAME:
188 return -EINVAL;
189 case -NFS4ERR_SHARE_DENIED:
190 return -EACCES;
191 case -NFS4ERR_MINOR_VERS_MISMATCH:
192 return -EPROTONOSUPPORT;
193 case -NFS4ERR_FILE_OPEN:
194 return -EBUSY;
195 case -NFS4ERR_NOT_SAME:
196 return -ENOTSYNC;
197 case -ENETDOWN:
198 case -ENETUNREACH:
199 break;
200 default:
201 dprintk("%s could not handle NFSv4 error %d\n",
202 __func__, -err);
203 break;
204 }
205 return -EIO;
206 }
207
208 /*
209 * This is our standard bitmap for GETATTR requests.
210 */
211 const u32 nfs4_fattr_bitmap[3] = {
212 FATTR4_WORD0_TYPE
213 | FATTR4_WORD0_CHANGE
214 | FATTR4_WORD0_SIZE
215 | FATTR4_WORD0_FSID
216 | FATTR4_WORD0_FILEID,
217 FATTR4_WORD1_MODE
218 | FATTR4_WORD1_NUMLINKS
219 | FATTR4_WORD1_OWNER
220 | FATTR4_WORD1_OWNER_GROUP
221 | FATTR4_WORD1_RAWDEV
222 | FATTR4_WORD1_SPACE_USED
223 | FATTR4_WORD1_TIME_ACCESS
224 | FATTR4_WORD1_TIME_CREATE
225 | FATTR4_WORD1_TIME_METADATA
226 | FATTR4_WORD1_TIME_MODIFY
227 | FATTR4_WORD1_MOUNTED_ON_FILEID,
228 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
229 FATTR4_WORD2_SECURITY_LABEL
230 #endif
231 };
232
233 static const u32 nfs4_pnfs_open_bitmap[3] = {
234 FATTR4_WORD0_TYPE
235 | FATTR4_WORD0_CHANGE
236 | FATTR4_WORD0_SIZE
237 | FATTR4_WORD0_FSID
238 | FATTR4_WORD0_FILEID,
239 FATTR4_WORD1_MODE
240 | FATTR4_WORD1_NUMLINKS
241 | FATTR4_WORD1_OWNER
242 | FATTR4_WORD1_OWNER_GROUP
243 | FATTR4_WORD1_RAWDEV
244 | FATTR4_WORD1_SPACE_USED
245 | FATTR4_WORD1_TIME_ACCESS
246 | FATTR4_WORD1_TIME_CREATE
247 | FATTR4_WORD1_TIME_METADATA
248 | FATTR4_WORD1_TIME_MODIFY,
249 FATTR4_WORD2_MDSTHRESHOLD
250 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
251 | FATTR4_WORD2_SECURITY_LABEL
252 #endif
253 };
254
255 static const u32 nfs4_open_noattr_bitmap[3] = {
256 FATTR4_WORD0_TYPE
257 | FATTR4_WORD0_FILEID,
258 };
259
260 const u32 nfs4_statfs_bitmap[3] = {
261 FATTR4_WORD0_FILES_AVAIL
262 | FATTR4_WORD0_FILES_FREE
263 | FATTR4_WORD0_FILES_TOTAL,
264 FATTR4_WORD1_SPACE_AVAIL
265 | FATTR4_WORD1_SPACE_FREE
266 | FATTR4_WORD1_SPACE_TOTAL
267 };
268
269 const u32 nfs4_pathconf_bitmap[3] = {
270 FATTR4_WORD0_MAXLINK
271 | FATTR4_WORD0_MAXNAME,
272 0
273 };
274
275 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
276 | FATTR4_WORD0_MAXREAD
277 | FATTR4_WORD0_MAXWRITE
278 | FATTR4_WORD0_LEASE_TIME,
279 FATTR4_WORD1_TIME_DELTA
280 | FATTR4_WORD1_FS_LAYOUT_TYPES,
281 FATTR4_WORD2_LAYOUT_BLKSIZE
282 | FATTR4_WORD2_CLONE_BLKSIZE
283 | FATTR4_WORD2_CHANGE_ATTR_TYPE
284 | FATTR4_WORD2_XATTR_SUPPORT
285 };
286
287 const u32 nfs4_fs_locations_bitmap[3] = {
288 FATTR4_WORD0_CHANGE
289 | FATTR4_WORD0_SIZE
290 | FATTR4_WORD0_FSID
291 | FATTR4_WORD0_FILEID
292 | FATTR4_WORD0_FS_LOCATIONS,
293 FATTR4_WORD1_OWNER
294 | FATTR4_WORD1_OWNER_GROUP
295 | FATTR4_WORD1_RAWDEV
296 | FATTR4_WORD1_SPACE_USED
297 | FATTR4_WORD1_TIME_ACCESS
298 | FATTR4_WORD1_TIME_METADATA
299 | FATTR4_WORD1_TIME_MODIFY
300 | FATTR4_WORD1_MOUNTED_ON_FILEID,
301 };
302
nfs4_bitmap_copy_adjust(__u32 * dst,const __u32 * src,struct inode * inode,unsigned long flags)303 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
304 struct inode *inode, unsigned long flags)
305 {
306 unsigned long cache_validity;
307
308 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
309 if (!inode || !nfs_have_read_or_write_delegation(inode))
310 return;
311
312 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
313
314 /* Remove the attributes over which we have full control */
315 dst[1] &= ~FATTR4_WORD1_RAWDEV;
316 if (!(cache_validity & NFS_INO_INVALID_SIZE))
317 dst[0] &= ~FATTR4_WORD0_SIZE;
318
319 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
320 dst[0] &= ~FATTR4_WORD0_CHANGE;
321
322 if (!(cache_validity & NFS_INO_INVALID_MODE))
323 dst[1] &= ~FATTR4_WORD1_MODE;
324 if (!(cache_validity & NFS_INO_INVALID_OTHER))
325 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
326
327 if (!(cache_validity & NFS_INO_INVALID_BTIME))
328 dst[1] &= ~FATTR4_WORD1_TIME_CREATE;
329
330 if (nfs_have_delegated_mtime(inode)) {
331 if (!(cache_validity & NFS_INO_INVALID_ATIME))
332 dst[1] &= ~(FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET);
333 if (!(cache_validity & NFS_INO_INVALID_MTIME))
334 dst[1] &= ~(FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET);
335 if (!(cache_validity & NFS_INO_INVALID_CTIME))
336 dst[1] &= ~(FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY_SET);
337 } else if (nfs_have_delegated_atime(inode)) {
338 if (!(cache_validity & NFS_INO_INVALID_ATIME))
339 dst[1] &= ~(FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET);
340 }
341 }
342
nfs4_setup_readdir(u64 cookie,__be32 * verifier,struct dentry * dentry,struct nfs4_readdir_arg * readdir)343 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
344 struct nfs4_readdir_arg *readdir)
345 {
346 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
347 __be32 *start, *p;
348
349 if (cookie > 2) {
350 readdir->cookie = cookie;
351 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
352 return;
353 }
354
355 readdir->cookie = 0;
356 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
357 if (cookie == 2)
358 return;
359
360 /*
361 * NFSv4 servers do not return entries for '.' and '..'
362 * Therefore, we fake these entries here. We let '.'
363 * have cookie 0 and '..' have cookie 1. Note that
364 * when talking to the server, we always send cookie 0
365 * instead of 1 or 2.
366 */
367 start = p = kmap_atomic(*readdir->pages);
368
369 if (cookie == 0) {
370 *p++ = xdr_one; /* next */
371 *p++ = xdr_zero; /* cookie, first word */
372 *p++ = xdr_one; /* cookie, second word */
373 *p++ = xdr_one; /* entry len */
374 memcpy(p, ".\0\0\0", 4); /* entry */
375 p++;
376 *p++ = xdr_one; /* bitmap length */
377 *p++ = htonl(attrs); /* bitmap */
378 *p++ = htonl(12); /* attribute buffer length */
379 *p++ = htonl(NF4DIR);
380 p = xdr_encode_hyper(p, d_inode(dentry)->i_ino);
381 }
382
383 *p++ = xdr_one; /* next */
384 *p++ = xdr_zero; /* cookie, first word */
385 *p++ = xdr_two; /* cookie, second word */
386 *p++ = xdr_two; /* entry len */
387 memcpy(p, "..\0\0", 4); /* entry */
388 p++;
389 *p++ = xdr_one; /* bitmap length */
390 *p++ = htonl(attrs); /* bitmap */
391 *p++ = htonl(12); /* attribute buffer length */
392 *p++ = htonl(NF4DIR);
393 spin_lock(&dentry->d_lock);
394 p = xdr_encode_hyper(p, d_inode(dentry->d_parent)->i_ino);
395 spin_unlock(&dentry->d_lock);
396
397 readdir->pgbase = (char *)p - (char *)start;
398 readdir->count -= readdir->pgbase;
399 kunmap_atomic(start);
400 }
401
nfs4_fattr_set_prechange(struct nfs_fattr * fattr,u64 version)402 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
403 {
404 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
405 fattr->pre_change_attr = version;
406 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
407 }
408 }
409
nfs4_test_and_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)410 static void nfs4_test_and_free_stateid(struct nfs_server *server,
411 nfs4_stateid *stateid,
412 const struct cred *cred)
413 {
414 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
415
416 ops->test_and_free_expired(server, stateid, cred);
417 }
418
__nfs4_free_revoked_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)419 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
420 nfs4_stateid *stateid,
421 const struct cred *cred)
422 {
423 stateid->type = NFS4_REVOKED_STATEID_TYPE;
424 nfs4_test_and_free_stateid(server, stateid, cred);
425 }
426
nfs4_free_revoked_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)427 static void nfs4_free_revoked_stateid(struct nfs_server *server,
428 const nfs4_stateid *stateid,
429 const struct cred *cred)
430 {
431 nfs4_stateid tmp;
432
433 nfs4_stateid_copy(&tmp, stateid);
434 __nfs4_free_revoked_stateid(server, &tmp, cred);
435 }
436
nfs4_update_delay(long * timeout)437 static long nfs4_update_delay(long *timeout)
438 {
439 long ret;
440 if (!timeout)
441 return NFS4_POLL_RETRY_MAX;
442 if (*timeout <= 0)
443 *timeout = NFS4_POLL_RETRY_MIN;
444 if (*timeout > NFS4_POLL_RETRY_MAX)
445 *timeout = NFS4_POLL_RETRY_MAX;
446 ret = *timeout;
447 *timeout <<= 1;
448 return ret;
449 }
450
nfs4_delay_killable(long * timeout)451 static int nfs4_delay_killable(long *timeout)
452 {
453 might_sleep();
454
455 if (unlikely(nfs_current_task_exiting()))
456 return -EINTR;
457 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
458 schedule_timeout(nfs4_update_delay(timeout));
459 if (!__fatal_signal_pending(current))
460 return 0;
461 return -EINTR;
462 }
463
nfs4_delay_interruptible(long * timeout)464 static int nfs4_delay_interruptible(long *timeout)
465 {
466 might_sleep();
467
468 if (unlikely(nfs_current_task_exiting()))
469 return -EINTR;
470 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
471 schedule_timeout(nfs4_update_delay(timeout));
472 if (!signal_pending(current))
473 return 0;
474 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
475 }
476
nfs4_delay(long * timeout,bool interruptible)477 static int nfs4_delay(long *timeout, bool interruptible)
478 {
479 if (interruptible)
480 return nfs4_delay_interruptible(timeout);
481 return nfs4_delay_killable(timeout);
482 }
483
484 static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid * stateid)485 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
486 {
487 if (!stateid)
488 return NULL;
489 switch (stateid->type) {
490 case NFS4_OPEN_STATEID_TYPE:
491 case NFS4_LOCK_STATEID_TYPE:
492 case NFS4_DELEGATION_STATEID_TYPE:
493 return stateid;
494 default:
495 break;
496 }
497 return NULL;
498 }
499
500 /* This is the error handling routine for processes that are allowed
501 * to sleep.
502 */
nfs4_do_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)503 static int nfs4_do_handle_exception(struct nfs_server *server,
504 int errorcode, struct nfs4_exception *exception)
505 {
506 struct nfs_client *clp = server->nfs_client;
507 struct nfs4_state *state = exception->state;
508 const nfs4_stateid *stateid;
509 struct inode *inode = exception->inode;
510 int ret = errorcode;
511
512 exception->delay = 0;
513 exception->recovering = 0;
514 exception->retry = 0;
515
516 stateid = nfs4_recoverable_stateid(exception->stateid);
517 if (stateid == NULL && state != NULL)
518 stateid = nfs4_recoverable_stateid(&state->stateid);
519
520 switch(errorcode) {
521 case 0:
522 return 0;
523 case -NFS4ERR_BADHANDLE:
524 case -ESTALE:
525 if (inode != NULL && S_ISREG(inode->i_mode))
526 pnfs_destroy_layout(NFS_I(inode));
527 break;
528 case -NFS4ERR_DELEG_REVOKED:
529 case -NFS4ERR_ADMIN_REVOKED:
530 case -NFS4ERR_EXPIRED:
531 case -NFS4ERR_BAD_STATEID:
532 case -NFS4ERR_PARTNER_NO_AUTH:
533 if (inode != NULL && stateid != NULL) {
534 nfs_inode_find_state_and_recover(inode,
535 stateid);
536 goto wait_on_recovery;
537 }
538 fallthrough;
539 case -NFS4ERR_OPENMODE:
540 if (inode) {
541 int err;
542
543 err = nfs_async_inode_return_delegation(inode,
544 stateid);
545 if (err == 0)
546 goto wait_on_recovery;
547 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
548 exception->retry = 1;
549 break;
550 }
551 }
552 if (state == NULL)
553 break;
554 ret = nfs4_schedule_stateid_recovery(server, state);
555 if (ret < 0)
556 break;
557 goto wait_on_recovery;
558 case -NFS4ERR_STALE_STATEID:
559 case -NFS4ERR_STALE_CLIENTID:
560 nfs4_schedule_lease_recovery(clp);
561 goto wait_on_recovery;
562 case -NFS4ERR_MOVED:
563 ret = nfs4_schedule_migration_recovery(server);
564 if (ret < 0)
565 break;
566 goto wait_on_recovery;
567 case -NFS4ERR_LEASE_MOVED:
568 nfs4_schedule_lease_moved_recovery(clp);
569 goto wait_on_recovery;
570 case -NFS4ERR_BADSESSION:
571 case -NFS4ERR_BADSLOT:
572 case -NFS4ERR_BAD_HIGH_SLOT:
573 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
574 case -NFS4ERR_DEADSESSION:
575 case -NFS4ERR_SEQ_FALSE_RETRY:
576 case -NFS4ERR_SEQ_MISORDERED:
577 /* Handled in nfs41_sequence_process() */
578 goto wait_on_recovery;
579 case -NFS4ERR_FILE_OPEN:
580 if (exception->timeout > HZ) {
581 /* We have retried a decent amount, time to
582 * fail
583 */
584 ret = -EBUSY;
585 break;
586 }
587 fallthrough;
588 case -NFS4ERR_DELAY:
589 nfs_inc_server_stats(server, NFSIOS_DELAY);
590 fallthrough;
591 case -NFS4ERR_GRACE:
592 case -NFS4ERR_LAYOUTTRYLATER:
593 case -NFS4ERR_RECALLCONFLICT:
594 case -NFS4ERR_RETURNCONFLICT:
595 exception->delay = 1;
596 return 0;
597
598 case -NFS4ERR_RETRY_UNCACHED_REP:
599 case -NFS4ERR_OLD_STATEID:
600 exception->retry = 1;
601 break;
602 case -NFS4ERR_BADOWNER:
603 /* The following works around a Linux server bug! */
604 case -NFS4ERR_BADNAME:
605 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
606 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
607 exception->retry = 1;
608 printk(KERN_WARNING "NFS: v4 server %s "
609 "does not accept raw "
610 "uid/gids. "
611 "Reenabling the idmapper.\n",
612 server->nfs_client->cl_hostname);
613 }
614 }
615 /* We failed to handle the error */
616 return nfs4_map_errors(ret);
617 wait_on_recovery:
618 exception->recovering = 1;
619 return 0;
620 }
621
622 /*
623 * Track the number of NFS4ERR_DELAY related retransmissions and return
624 * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
625 * set by 'nfs_delay_retrans'.
626 */
nfs4_exception_should_retrans(const struct nfs_server * server,struct nfs4_exception * exception)627 static int nfs4_exception_should_retrans(const struct nfs_server *server,
628 struct nfs4_exception *exception)
629 {
630 if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
631 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
632 return -EAGAIN;
633 }
634 return 0;
635 }
636
637 /* This is the error handling routine for processes that are allowed
638 * to sleep.
639 */
nfs4_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)640 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
641 {
642 struct nfs_client *clp = server->nfs_client;
643 int ret;
644
645 ret = nfs4_do_handle_exception(server, errorcode, exception);
646 if (exception->delay) {
647 int ret2 = nfs4_exception_should_retrans(server, exception);
648 if (ret2 < 0) {
649 exception->retry = 0;
650 return ret2;
651 }
652 ret = nfs4_delay(&exception->timeout,
653 exception->interruptible);
654 goto out_retry;
655 }
656 if (exception->recovering) {
657 if (exception->task_is_privileged)
658 return -EDEADLOCK;
659 ret = nfs4_wait_clnt_recover(clp);
660 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
661 return -EIO;
662 goto out_retry;
663 }
664 return ret;
665 out_retry:
666 if (ret == 0)
667 exception->retry = 1;
668 return ret;
669 }
670
671 static int
nfs4_async_handle_exception(struct rpc_task * task,struct nfs_server * server,int errorcode,struct nfs4_exception * exception)672 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
673 int errorcode, struct nfs4_exception *exception)
674 {
675 struct nfs_client *clp = server->nfs_client;
676 int ret;
677
678 if ((task->tk_rpc_status == -ENETDOWN ||
679 task->tk_rpc_status == -ENETUNREACH) &&
680 task->tk_flags & RPC_TASK_NETUNREACH_FATAL) {
681 exception->delay = 0;
682 exception->recovering = 0;
683 exception->retry = 0;
684 return -EIO;
685 }
686
687 ret = nfs4_do_handle_exception(server, errorcode, exception);
688 if (exception->delay) {
689 int ret2 = nfs4_exception_should_retrans(server, exception);
690 if (ret2 < 0) {
691 exception->retry = 0;
692 return ret2;
693 }
694 rpc_delay(task, nfs4_update_delay(&exception->timeout));
695 goto out_retry;
696 }
697 if (exception->recovering) {
698 if (exception->task_is_privileged)
699 return -EDEADLOCK;
700 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
701 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
702 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
703 goto out_retry;
704 }
705 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
706 ret = -EIO;
707 return ret;
708 out_retry:
709 if (ret == 0) {
710 exception->retry = 1;
711 /*
712 * For NFS4ERR_MOVED, the client transport will need to
713 * be recomputed after migration recovery has completed.
714 */
715 if (errorcode == -NFS4ERR_MOVED)
716 rpc_task_release_transport(task);
717 }
718 return ret;
719 }
720
721 int
nfs4_async_handle_error(struct rpc_task * task,struct nfs_server * server,struct nfs4_state * state,long * timeout)722 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
723 struct nfs4_state *state, long *timeout)
724 {
725 struct nfs4_exception exception = {
726 .state = state,
727 };
728
729 if (task->tk_status >= 0)
730 return 0;
731 if (timeout)
732 exception.timeout = *timeout;
733 task->tk_status = nfs4_async_handle_exception(task, server,
734 task->tk_status,
735 &exception);
736 if (exception.delay && timeout)
737 *timeout = exception.timeout;
738 if (exception.retry)
739 return -EAGAIN;
740 return 0;
741 }
742
743 /*
744 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
745 * or 'false' otherwise.
746 */
_nfs4_is_integrity_protected(struct nfs_client * clp)747 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
748 {
749 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
750 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
751 }
752
do_renew_lease(struct nfs_client * clp,unsigned long timestamp)753 void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
754 {
755 spin_lock(&clp->cl_lock);
756 if (time_before(clp->cl_last_renewal,timestamp))
757 clp->cl_last_renewal = timestamp;
758 spin_unlock(&clp->cl_lock);
759 }
760
renew_lease(const struct nfs_server * server,unsigned long timestamp)761 void renew_lease(const struct nfs_server *server, unsigned long timestamp)
762 {
763 struct nfs_client *clp = server->nfs_client;
764
765 if (!nfs4_has_session(clp))
766 do_renew_lease(clp, timestamp);
767 }
768
nfs4_init_sequence(struct nfs_client * clp,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply,int privileged)769 void nfs4_init_sequence(struct nfs_client *clp,
770 struct nfs4_sequence_args *args,
771 struct nfs4_sequence_res *res, int cache_reply,
772 int privileged)
773 {
774 args->sa_slot = NULL;
775 args->sa_cache_this = cache_reply;
776 args->sa_privileged = privileged;
777
778 res->sr_slot = NULL;
779 res->sr_slot_ops = clp->cl_mvops->sequence_slot_ops;
780 }
781
nfs41_release_slot(struct nfs4_slot * slot)782 static void nfs41_release_slot(struct nfs4_slot *slot)
783 {
784 struct nfs4_session *session;
785 struct nfs4_slot_table *tbl;
786 bool send_new_highest_used_slotid = false;
787
788 if (!slot)
789 return;
790 tbl = slot->table;
791 session = tbl->session;
792
793 /* Bump the slot sequence number */
794 if (slot->seq_done)
795 slot->seq_nr++;
796 slot->seq_done = 0;
797
798 spin_lock(&tbl->slot_tbl_lock);
799 /* Be nice to the server: try to ensure that the last transmitted
800 * value for highest_user_slotid <= target_highest_slotid
801 */
802 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
803 send_new_highest_used_slotid = true;
804
805 if (nfs41_wake_and_assign_slot(tbl, slot)) {
806 send_new_highest_used_slotid = false;
807 goto out_unlock;
808 }
809 nfs4_free_slot(tbl, slot);
810
811 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
812 send_new_highest_used_slotid = false;
813 out_unlock:
814 spin_unlock(&tbl->slot_tbl_lock);
815 if (send_new_highest_used_slotid)
816 nfs41_notify_server(session->clp);
817 if (waitqueue_active(&tbl->slot_waitq))
818 wake_up_all(&tbl->slot_waitq);
819 }
820
nfs41_sequence_free_slot(struct nfs4_sequence_res * res)821 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
822 {
823 nfs41_release_slot(res->sr_slot);
824 res->sr_slot = NULL;
825 }
826
nfs4_slot_sequence_record_sent(struct nfs4_slot * slot,u32 seqnr)827 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
828 u32 seqnr)
829 {
830 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
831 slot->seq_nr_highest_sent = seqnr;
832 }
nfs4_slot_sequence_acked(struct nfs4_slot * slot,u32 seqnr)833 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
834 {
835 nfs4_slot_sequence_record_sent(slot, seqnr);
836 slot->seq_nr_last_acked = seqnr;
837 }
838
nfs4_probe_sequence(struct nfs_client * client,const struct cred * cred,struct nfs4_slot * slot)839 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
840 struct nfs4_slot *slot)
841 {
842 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
843 if (!IS_ERR(task))
844 rpc_put_task_async(task);
845 }
846
nfs41_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)847 static int nfs41_sequence_process(struct rpc_task *task,
848 struct nfs4_sequence_res *res)
849 {
850 struct nfs4_session *session;
851 struct nfs4_slot *slot = res->sr_slot;
852 struct nfs_client *clp;
853 int status;
854 int ret = 1;
855
856 if (slot == NULL)
857 goto out_noaction;
858 /* don't increment the sequence number if the task wasn't sent */
859 if (!RPC_WAS_SENT(task) || slot->seq_done)
860 goto out;
861
862 session = slot->table->session;
863 clp = session->clp;
864
865 trace_nfs4_sequence_done(session, res);
866
867 status = res->sr_status;
868 if (task->tk_status == -NFS4ERR_DEADSESSION)
869 status = -NFS4ERR_DEADSESSION;
870
871 /* Check the SEQUENCE operation status */
872 switch (status) {
873 case 0:
874 /* Mark this sequence number as having been acked */
875 nfs4_slot_sequence_acked(slot, slot->seq_nr);
876 /* Update the slot's sequence and clientid lease timer */
877 slot->seq_done = 1;
878 do_renew_lease(clp, res->sr_timestamp);
879 /* Check sequence flags */
880 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
881 !!slot->privileged);
882 nfs41_update_target_slotid(slot->table, slot, res);
883 break;
884 case 1:
885 /*
886 * sr_status remains 1 if an RPC level error occurred.
887 * The server may or may not have processed the sequence
888 * operation..
889 */
890 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
891 slot->seq_done = 1;
892 goto out;
893 case -NFS4ERR_DELAY:
894 /* The server detected a resend of the RPC call and
895 * returned NFS4ERR_DELAY as per Section 2.10.6.2
896 * of RFC5661.
897 */
898 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
899 __func__,
900 slot->slot_nr,
901 slot->seq_nr);
902 goto out_retry;
903 case -NFS4ERR_RETRY_UNCACHED_REP:
904 case -NFS4ERR_SEQ_FALSE_RETRY:
905 /*
906 * The server thinks we tried to replay a request.
907 * Retry the call after bumping the sequence ID.
908 */
909 nfs4_slot_sequence_acked(slot, slot->seq_nr);
910 goto retry_new_seq;
911 case -NFS4ERR_BADSLOT:
912 /*
913 * The slot id we used was probably retired. Try again
914 * using a different slot id.
915 */
916 if (slot->slot_nr < slot->table->target_highest_slotid)
917 goto session_recover;
918 goto retry_nowait;
919 case -NFS4ERR_SEQ_MISORDERED:
920 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
921 /*
922 * Were one or more calls using this slot interrupted?
923 * If the server never received the request, then our
924 * transmitted slot sequence number may be too high. However,
925 * if the server did receive the request then it might
926 * accidentally give us a reply with a mismatched operation.
927 * We can sort this out by sending a lone sequence operation
928 * to the server on the same slot.
929 */
930 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
931 slot->seq_nr--;
932 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
933 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
934 res->sr_slot = NULL;
935 }
936 goto retry_nowait;
937 }
938 /*
939 * RFC5661:
940 * A retry might be sent while the original request is
941 * still in progress on the replier. The replier SHOULD
942 * deal with the issue by returning NFS4ERR_DELAY as the
943 * reply to SEQUENCE or CB_SEQUENCE operation, but
944 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
945 *
946 * Restart the search after a delay.
947 */
948 slot->seq_nr = slot->seq_nr_highest_sent;
949 goto out_retry;
950 case -NFS4ERR_BADSESSION:
951 case -NFS4ERR_DEADSESSION:
952 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
953 goto session_recover;
954 default:
955 /* Just update the slot sequence no. */
956 slot->seq_done = 1;
957 }
958 out:
959 /* The session may be reset by one of the error handlers. */
960 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
961 out_noaction:
962 return ret;
963 session_recover:
964 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
965 nfs4_schedule_session_recovery(session, status);
966 dprintk("%s ERROR: %d Reset session\n", __func__, status);
967 nfs41_sequence_free_slot(res);
968 goto out;
969 retry_new_seq:
970 ++slot->seq_nr;
971 retry_nowait:
972 if (rpc_restart_call_prepare(task)) {
973 nfs41_sequence_free_slot(res);
974 task->tk_status = 0;
975 ret = 0;
976 }
977 goto out;
978 out_retry:
979 if (!rpc_restart_call(task))
980 goto out;
981 rpc_delay(task, NFS4_POLL_RETRY_MAX);
982 return 0;
983 }
984
nfs41_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)985 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
986 {
987 if (!nfs41_sequence_process(task, res))
988 return 0;
989 if (res->sr_slot != NULL)
990 nfs41_sequence_free_slot(res);
991 return 1;
992
993 }
994 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
995
nfs41_call_sync_prepare(struct rpc_task * task,void * calldata)996 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
997 {
998 struct nfs4_call_sync_data *data = calldata;
999
1000 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1001
1002 nfs4_setup_sequence(data->seq_server->nfs_client,
1003 data->seq_args, data->seq_res, task);
1004 }
1005
nfs41_call_sync_done(struct rpc_task * task,void * calldata)1006 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1007 {
1008 struct nfs4_call_sync_data *data = calldata;
1009
1010 nfs41_sequence_done(task, data->seq_res);
1011 }
1012
1013 static const struct rpc_call_ops nfs41_call_sync_ops = {
1014 .rpc_call_prepare = nfs41_call_sync_prepare,
1015 .rpc_call_done = nfs41_call_sync_done,
1016 };
1017
1018
nfs41_sequence_res_init(struct nfs4_sequence_res * res)1019 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1020 {
1021 res->sr_timestamp = jiffies;
1022 res->sr_status_flags = 0;
1023 res->sr_status = 1;
1024 }
1025
1026 static
nfs4_sequence_attach_slot(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct nfs4_slot * slot)1027 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1028 struct nfs4_sequence_res *res,
1029 struct nfs4_slot *slot)
1030 {
1031 if (!slot)
1032 return;
1033 slot->privileged = args->sa_privileged ? 1 : 0;
1034 args->sa_slot = slot;
1035
1036 res->sr_slot = slot;
1037 }
1038
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1039 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1040 {
1041 if (res->sr_slot != NULL)
1042 res->sr_slot_ops->free_slot(res);
1043 }
1044
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)1045 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1046 {
1047 if (res->sr_slot == NULL)
1048 return 1;
1049 return res->sr_slot_ops->process(task, res);
1050 }
1051
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1052 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1053 {
1054 if (res->sr_slot == NULL)
1055 return 1;
1056 return res->sr_slot_ops->done(task, res);
1057 }
1058 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1059
1060
nfs4_setup_sequence(struct nfs_client * client,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct rpc_task * task)1061 int nfs4_setup_sequence(struct nfs_client *client,
1062 struct nfs4_sequence_args *args,
1063 struct nfs4_sequence_res *res,
1064 struct rpc_task *task)
1065 {
1066 struct nfs4_session *session = nfs4_get_session(client);
1067 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
1068 struct nfs4_slot *slot;
1069
1070 /* slot already allocated? */
1071 if (res->sr_slot != NULL)
1072 goto out_start;
1073
1074 if (session)
1075 tbl = &session->fc_slot_table;
1076
1077 spin_lock(&tbl->slot_tbl_lock);
1078 /* The state manager will wait until the slot table is empty */
1079 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1080 goto out_sleep;
1081
1082 slot = nfs4_alloc_slot(tbl);
1083 if (IS_ERR(slot)) {
1084 if (slot == ERR_PTR(-ENOMEM))
1085 goto out_sleep_timeout;
1086 goto out_sleep;
1087 }
1088 spin_unlock(&tbl->slot_tbl_lock);
1089
1090 nfs4_sequence_attach_slot(args, res, slot);
1091
1092 trace_nfs4_setup_sequence(session, args);
1093 out_start:
1094 nfs41_sequence_res_init(res);
1095 rpc_call_start(task);
1096 return 0;
1097 out_sleep_timeout:
1098 /* Try again in 1/4 second */
1099 if (args->sa_privileged)
1100 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1101 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1102 else
1103 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1104 NULL, jiffies + (HZ >> 2));
1105 spin_unlock(&tbl->slot_tbl_lock);
1106 return -EAGAIN;
1107 out_sleep:
1108 if (args->sa_privileged)
1109 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1110 RPC_PRIORITY_PRIVILEGED);
1111 else
1112 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1113 spin_unlock(&tbl->slot_tbl_lock);
1114 return -EAGAIN;
1115 }
1116 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1117
nfs4_call_sync_custom(struct rpc_task_setup * task_setup)1118 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1119 {
1120 int ret;
1121 struct rpc_task *task;
1122
1123 task = rpc_run_task(task_setup);
1124 if (IS_ERR(task))
1125 return PTR_ERR(task);
1126
1127 ret = task->tk_status;
1128 rpc_put_task(task);
1129 return ret;
1130 }
1131
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)1132 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1133 struct nfs_server *server,
1134 struct rpc_message *msg,
1135 struct nfs4_sequence_args *args,
1136 struct nfs4_sequence_res *res,
1137 unsigned short task_flags)
1138 {
1139 struct nfs_client *clp = server->nfs_client;
1140 struct nfs4_call_sync_data data = {
1141 .seq_server = server,
1142 .seq_args = args,
1143 .seq_res = res,
1144 };
1145 struct rpc_task_setup task_setup = {
1146 .rpc_client = clnt,
1147 .rpc_message = msg,
1148 .callback_ops = clp->cl_mvops->call_sync_ops,
1149 .callback_data = &data,
1150 .flags = task_flags,
1151 };
1152
1153 return nfs4_call_sync_custom(&task_setup);
1154 }
1155
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)1156 int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1157 struct nfs_server *server,
1158 struct rpc_message *msg,
1159 struct nfs4_sequence_args *args,
1160 struct nfs4_sequence_res *res)
1161 {
1162 unsigned short task_flags = 0;
1163
1164 if (server->caps & NFS_CAP_MOVEABLE)
1165 task_flags = RPC_TASK_MOVEABLE;
1166 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1167 }
1168
1169
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)1170 int nfs4_call_sync(struct rpc_clnt *clnt,
1171 struct nfs_server *server,
1172 struct rpc_message *msg,
1173 struct nfs4_sequence_args *args,
1174 struct nfs4_sequence_res *res,
1175 int cache_reply)
1176 {
1177 nfs4_init_sequence(server->nfs_client, args, res, cache_reply, 0);
1178 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1179 }
1180
1181 static void
nfs4_inc_nlink_locked(struct inode * inode)1182 nfs4_inc_nlink_locked(struct inode *inode)
1183 {
1184 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1185 NFS_INO_INVALID_CTIME |
1186 NFS_INO_INVALID_NLINK);
1187 inc_nlink(inode);
1188 }
1189
1190 static void
nfs4_inc_nlink(struct inode * inode)1191 nfs4_inc_nlink(struct inode *inode)
1192 {
1193 spin_lock(&inode->i_lock);
1194 nfs4_inc_nlink_locked(inode);
1195 spin_unlock(&inode->i_lock);
1196 }
1197
1198 static void
nfs4_dec_nlink_locked(struct inode * inode)1199 nfs4_dec_nlink_locked(struct inode *inode)
1200 {
1201 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1202 NFS_INO_INVALID_CTIME |
1203 NFS_INO_INVALID_NLINK);
1204 drop_nlink(inode);
1205 }
1206
1207 static void
nfs4_update_changeattr_locked(struct inode * inode,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1208 nfs4_update_changeattr_locked(struct inode *inode,
1209 struct nfs4_change_info *cinfo,
1210 unsigned long timestamp, unsigned long cache_validity)
1211 {
1212 struct nfs_inode *nfsi = NFS_I(inode);
1213 u64 change_attr = inode_peek_iversion_raw(inode);
1214
1215 if (!nfs_have_delegated_mtime(inode))
1216 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1217 if (S_ISDIR(inode->i_mode))
1218 cache_validity |= NFS_INO_INVALID_DATA;
1219
1220 switch (NFS_SERVER(inode)->change_attr_type) {
1221 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1222 if (cinfo->after == change_attr)
1223 goto out;
1224 break;
1225 default:
1226 if ((s64)(change_attr - cinfo->after) >= 0)
1227 goto out;
1228 }
1229
1230 inode_set_iversion_raw(inode, cinfo->after);
1231 if (!cinfo->atomic || cinfo->before != change_attr) {
1232 if (S_ISDIR(inode->i_mode))
1233 nfs_force_lookup_revalidate(inode);
1234
1235 if (!nfs_have_delegated_attributes(inode))
1236 cache_validity |=
1237 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1238 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1239 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1240 NFS_INO_INVALID_MODE | NFS_INO_INVALID_BTIME |
1241 NFS_INO_INVALID_XATTR;
1242 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1243 }
1244 nfsi->attrtimeo_timestamp = jiffies;
1245 nfsi->read_cache_jiffies = timestamp;
1246 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1247 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1248 out:
1249 nfs_set_cache_invalid(inode, cache_validity);
1250 }
1251
1252 void
nfs4_update_changeattr(struct inode * dir,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1253 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1254 unsigned long timestamp, unsigned long cache_validity)
1255 {
1256 spin_lock(&dir->i_lock);
1257 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1258 spin_unlock(&dir->i_lock);
1259 }
1260
1261 struct nfs4_open_createattrs {
1262 struct nfs4_label *label;
1263 struct iattr *sattr;
1264 const __u32 verf[2];
1265 };
1266
nfs4_clear_cap_atomic_open_v1(struct nfs_server * server,int err,struct nfs4_exception * exception)1267 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1268 int err, struct nfs4_exception *exception)
1269 {
1270 if (err != -EINVAL)
1271 return false;
1272 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1273 return false;
1274 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1275 exception->retry = 1;
1276 return true;
1277 }
1278
_nfs4_ctx_to_accessmode(const struct nfs_open_context * ctx)1279 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1280 {
1281 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1282 }
1283
_nfs4_ctx_to_openmode(const struct nfs_open_context * ctx)1284 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1285 {
1286 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1287
1288 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1289 }
1290
1291 static u32
nfs4_fmode_to_share_access(fmode_t fmode)1292 nfs4_fmode_to_share_access(fmode_t fmode)
1293 {
1294 u32 res = 0;
1295
1296 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1297 case FMODE_READ:
1298 res = NFS4_SHARE_ACCESS_READ;
1299 break;
1300 case FMODE_WRITE:
1301 res = NFS4_SHARE_ACCESS_WRITE;
1302 break;
1303 case FMODE_READ|FMODE_WRITE:
1304 res = NFS4_SHARE_ACCESS_BOTH;
1305 }
1306 return res;
1307 }
1308
1309 static u32
nfs4_map_atomic_open_share(struct nfs_server * server,fmode_t fmode,int openflags)1310 nfs4_map_atomic_open_share(struct nfs_server *server,
1311 fmode_t fmode, int openflags)
1312 {
1313 u32 res = nfs4_fmode_to_share_access(fmode);
1314
1315 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1316 goto out;
1317 /* Want no delegation if we're using O_DIRECT */
1318 if (openflags & O_DIRECT) {
1319 res |= NFS4_SHARE_WANT_NO_DELEG;
1320 goto out;
1321 }
1322 /* res |= NFS4_SHARE_WANT_NO_PREFERENCE; */
1323 if (server->caps & NFS_CAP_DELEGTIME)
1324 res |= NFS4_SHARE_WANT_DELEG_TIMESTAMPS;
1325 if (server->caps & NFS_CAP_OPEN_XOR)
1326 res |= NFS4_SHARE_WANT_OPEN_XOR_DELEGATION;
1327 out:
1328 return res;
1329 }
1330
1331 static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server * server,enum open_claim_type4 claim)1332 nfs4_map_atomic_open_claim(struct nfs_server *server,
1333 enum open_claim_type4 claim)
1334 {
1335 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1336 return claim;
1337 switch (claim) {
1338 default:
1339 return claim;
1340 case NFS4_OPEN_CLAIM_FH:
1341 return NFS4_OPEN_CLAIM_NULL;
1342 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1343 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1344 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1345 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1346 }
1347 }
1348
nfs4_init_opendata_res(struct nfs4_opendata * p)1349 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1350 {
1351 p->o_res.f_attr = &p->f_attr;
1352 p->o_res.seqid = p->o_arg.seqid;
1353 p->c_res.seqid = p->c_arg.seqid;
1354 p->o_res.server = p->o_arg.server;
1355 p->o_res.access_request = p->o_arg.access;
1356 nfs_fattr_init(&p->f_attr);
1357 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1358 }
1359
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)1360 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1361 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1362 const struct nfs4_open_createattrs *c,
1363 enum open_claim_type4 claim,
1364 gfp_t gfp_mask)
1365 {
1366 struct dentry *parent = dget_parent(dentry);
1367 struct inode *dir = d_inode(parent);
1368 struct nfs_server *server = NFS_SERVER(dir);
1369 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1370 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1371 struct nfs4_opendata *p;
1372
1373 p = kzalloc_obj(*p, gfp_mask);
1374 if (p == NULL)
1375 goto err;
1376
1377 p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1378 if (IS_ERR(p->f_attr.label))
1379 goto err_free_p;
1380
1381 p->a_label = nfs4_label_alloc(server, gfp_mask);
1382 if (IS_ERR(p->a_label))
1383 goto err_free_f;
1384
1385 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1386 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1387 if (IS_ERR(p->o_arg.seqid))
1388 goto err_free_label;
1389 nfs_sb_active(dentry->d_sb);
1390 p->dentry = dget(dentry);
1391 p->dir = parent;
1392 p->owner = sp;
1393 atomic_inc(&sp->so_count);
1394 p->o_arg.open_flags = flags;
1395 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1396 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1397 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1398 fmode, flags);
1399 if (flags & O_CREAT) {
1400 p->o_arg.umask = current_umask();
1401 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1402 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1403 p->o_arg.u.attrs = &p->attrs;
1404 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1405
1406 memcpy(p->o_arg.u.verifier.data, c->verf,
1407 sizeof(p->o_arg.u.verifier.data));
1408 }
1409 }
1410 /* ask server to check for all possible rights as results
1411 * are cached */
1412 switch (p->o_arg.claim) {
1413 default:
1414 break;
1415 case NFS4_OPEN_CLAIM_NULL:
1416 case NFS4_OPEN_CLAIM_FH:
1417 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1418 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1419 NFS4_ACCESS_EXECUTE |
1420 nfs_access_xattr_mask(server);
1421 }
1422 p->o_arg.clientid = server->nfs_client->cl_clientid;
1423 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1424 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1425 p->o_arg.name = &dentry->d_name;
1426 p->o_arg.server = server;
1427 p->o_arg.bitmask = nfs4_bitmask(server, label);
1428 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1429 switch (p->o_arg.claim) {
1430 case NFS4_OPEN_CLAIM_NULL:
1431 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1432 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1433 p->o_arg.fh = NFS_FH(dir);
1434 break;
1435 case NFS4_OPEN_CLAIM_PREVIOUS:
1436 case NFS4_OPEN_CLAIM_FH:
1437 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1438 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1439 p->o_arg.fh = NFS_FH(d_inode(dentry));
1440 }
1441 p->c_arg.fh = &p->o_res.fh;
1442 p->c_arg.stateid = &p->o_res.stateid;
1443 p->c_arg.seqid = p->o_arg.seqid;
1444 nfs4_init_opendata_res(p);
1445 kref_init(&p->kref);
1446 return p;
1447
1448 err_free_label:
1449 nfs4_label_free(p->a_label);
1450 err_free_f:
1451 nfs4_label_free(p->f_attr.label);
1452 err_free_p:
1453 kfree(p);
1454 err:
1455 dput(parent);
1456 return NULL;
1457 }
1458
nfs4_opendata_free(struct kref * kref)1459 static void nfs4_opendata_free(struct kref *kref)
1460 {
1461 struct nfs4_opendata *p = container_of(kref,
1462 struct nfs4_opendata, kref);
1463 struct super_block *sb = p->dentry->d_sb;
1464
1465 nfs4_lgopen_release(p->lgp);
1466 nfs_free_seqid(p->o_arg.seqid);
1467 nfs4_sequence_free_slot(&p->o_res.seq_res);
1468 if (p->state != NULL)
1469 nfs4_put_open_state(p->state);
1470 nfs4_put_state_owner(p->owner);
1471
1472 nfs4_label_free(p->a_label);
1473 nfs4_label_free(p->f_attr.label);
1474
1475 dput(p->dir);
1476 dput(p->dentry);
1477 nfs_sb_deactive(sb);
1478 nfs_fattr_free_names(&p->f_attr);
1479 kfree(p->f_attr.mdsthreshold);
1480 kfree(p);
1481 }
1482
nfs4_opendata_put(struct nfs4_opendata * p)1483 static void nfs4_opendata_put(struct nfs4_opendata *p)
1484 {
1485 if (p != NULL)
1486 kref_put(&p->kref, nfs4_opendata_free);
1487 }
1488
nfs4_mode_match_open_stateid(struct nfs4_state * state,fmode_t fmode)1489 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1490 fmode_t fmode)
1491 {
1492 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1493 case FMODE_READ|FMODE_WRITE:
1494 return state->n_rdwr != 0;
1495 case FMODE_WRITE:
1496 return state->n_wronly != 0;
1497 case FMODE_READ:
1498 return state->n_rdonly != 0;
1499 }
1500 WARN_ON_ONCE(1);
1501 return false;
1502 }
1503
can_open_cached(struct nfs4_state * state,fmode_t mode,int open_mode,enum open_claim_type4 claim)1504 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1505 int open_mode, enum open_claim_type4 claim)
1506 {
1507 int ret = 0;
1508
1509 if (open_mode & (O_EXCL|O_TRUNC))
1510 goto out;
1511 switch (claim) {
1512 case NFS4_OPEN_CLAIM_NULL:
1513 case NFS4_OPEN_CLAIM_FH:
1514 goto out;
1515 default:
1516 break;
1517 }
1518 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1519 case FMODE_READ:
1520 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1521 && state->n_rdonly != 0;
1522 break;
1523 case FMODE_WRITE:
1524 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1525 && state->n_wronly != 0;
1526 break;
1527 case FMODE_READ|FMODE_WRITE:
1528 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1529 && state->n_rdwr != 0;
1530 }
1531 out:
1532 return ret;
1533 }
1534
can_open_delegated(const struct inode * inode,fmode_t fmode,enum open_claim_type4 claim,nfs4_stateid * stateid)1535 static bool can_open_delegated(const struct inode *inode, fmode_t fmode,
1536 enum open_claim_type4 claim, nfs4_stateid *stateid)
1537 {
1538 struct nfs_delegation *delegation;
1539 bool ret = false;
1540
1541 delegation = nfs4_get_valid_delegation(inode);
1542 if (!delegation)
1543 return false;
1544 if ((delegation->type & fmode) != fmode)
1545 goto out_put_delegation;
1546
1547 switch (claim) {
1548 case NFS4_OPEN_CLAIM_PREVIOUS:
1549 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1550 break;
1551 fallthrough;
1552 case NFS4_OPEN_CLAIM_NULL:
1553 case NFS4_OPEN_CLAIM_FH:
1554 nfs_mark_delegation_referenced(delegation);
1555 /* Save the delegation stateid */
1556 if (stateid)
1557 nfs4_stateid_copy(stateid, &delegation->stateid);
1558 ret = true;
1559 break;
1560 default:
1561 break;
1562 }
1563
1564 out_put_delegation:
1565 nfs_put_delegation(delegation);
1566 return ret;
1567 }
1568
update_open_stateflags(struct nfs4_state * state,fmode_t fmode)1569 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1570 {
1571 switch (fmode) {
1572 case FMODE_WRITE:
1573 state->n_wronly++;
1574 break;
1575 case FMODE_READ:
1576 state->n_rdonly++;
1577 break;
1578 case FMODE_READ|FMODE_WRITE:
1579 state->n_rdwr++;
1580 }
1581 nfs4_state_set_mode_locked(state, state->state | fmode);
1582 }
1583
nfs_open_stateid_recover_openmode(struct nfs4_state * state)1584 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1585 {
1586 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1587 return true;
1588 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1589 return true;
1590 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1591 return true;
1592 return false;
1593 }
1594
nfs_state_log_update_open_stateid(struct nfs4_state * state)1595 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1596 {
1597 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1598 wake_up_all(&state->waitq);
1599 }
1600
nfs_test_and_clear_all_open_stateid(struct nfs4_state * state)1601 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1602 {
1603 struct nfs_client *clp = state->owner->so_server->nfs_client;
1604 bool need_recover = false;
1605
1606 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1607 need_recover = true;
1608 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1609 need_recover = true;
1610 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1611 need_recover = true;
1612 if (need_recover)
1613 nfs4_state_mark_reclaim_nograce(clp, state);
1614 }
1615
1616 /*
1617 * Check for whether or not the caller may update the open stateid
1618 * to the value passed in by stateid.
1619 *
1620 * Note: This function relies heavily on the server implementing
1621 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1622 * correctly.
1623 * i.e. The stateid seqids have to be initialised to 1, and
1624 * are then incremented on every state transition.
1625 */
nfs_stateid_is_sequential(struct nfs4_state * state,const nfs4_stateid * stateid)1626 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1627 const nfs4_stateid *stateid)
1628 {
1629 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1630 /* The common case - we're updating to a new sequence number */
1631 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1632 if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1633 return true;
1634 return false;
1635 }
1636 /* The server returned a new stateid */
1637 }
1638 /* This is the first OPEN in this generation */
1639 if (stateid->seqid == cpu_to_be32(1))
1640 return true;
1641 return false;
1642 }
1643
nfs_resync_open_stateid_locked(struct nfs4_state * state)1644 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1645 {
1646 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1647 return;
1648 if (state->n_wronly)
1649 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1650 if (state->n_rdonly)
1651 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1652 if (state->n_rdwr)
1653 set_bit(NFS_O_RDWR_STATE, &state->flags);
1654 set_bit(NFS_OPEN_STATE, &state->flags);
1655 }
1656
nfs_clear_open_stateid_locked(struct nfs4_state * state,nfs4_stateid * stateid,fmode_t fmode)1657 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1658 nfs4_stateid *stateid, fmode_t fmode)
1659 {
1660 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1661 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1662 case FMODE_WRITE:
1663 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1664 break;
1665 case FMODE_READ:
1666 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1667 break;
1668 case 0:
1669 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1670 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1671 clear_bit(NFS_OPEN_STATE, &state->flags);
1672 }
1673 if (stateid == NULL)
1674 return;
1675 /* Handle OPEN+OPEN_DOWNGRADE races */
1676 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1677 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1678 nfs_resync_open_stateid_locked(state);
1679 goto out;
1680 }
1681 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1682 nfs4_stateid_copy(&state->stateid, stateid);
1683 nfs4_stateid_copy(&state->open_stateid, stateid);
1684 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1685 out:
1686 nfs_state_log_update_open_stateid(state);
1687 }
1688
nfs_clear_open_stateid(struct nfs4_state * state,nfs4_stateid * arg_stateid,nfs4_stateid * stateid,fmode_t fmode)1689 static void nfs_clear_open_stateid(struct nfs4_state *state,
1690 nfs4_stateid *arg_stateid,
1691 nfs4_stateid *stateid, fmode_t fmode)
1692 {
1693 write_seqlock(&state->seqlock);
1694 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1695 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1696 nfs_clear_open_stateid_locked(state, stateid, fmode);
1697 write_sequnlock(&state->seqlock);
1698 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1699 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1700 }
1701
nfs_set_open_stateid_locked(struct nfs4_state * state,const nfs4_stateid * stateid,nfs4_stateid * freeme)1702 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1703 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1704 __must_hold(&state->owner->so_lock)
1705 __must_hold(&state->seqlock)
1706 __must_hold(RCU)
1707
1708 {
1709 DEFINE_WAIT(wait);
1710 int status = 0;
1711 for (;;) {
1712
1713 if (nfs_stateid_is_sequential(state, stateid))
1714 break;
1715
1716 if (status) {
1717 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1718 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1719 trace_nfs4_open_stateid_update_skip(state->inode,
1720 stateid, status);
1721 return;
1722 } else {
1723 break;
1724 }
1725 }
1726
1727 /* Rely on seqids for serialisation with NFSv4.0 */
1728 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1729 break;
1730
1731 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1732 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1733 /*
1734 * Ensure we process the state changes in the same order
1735 * in which the server processed them by delaying the
1736 * update of the stateid until we are in sequence.
1737 */
1738 write_sequnlock(&state->seqlock);
1739 spin_unlock(&state->owner->so_lock);
1740 rcu_read_unlock();
1741 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1742
1743 if (!fatal_signal_pending(current) &&
1744 !nfs_current_task_exiting()) {
1745 if (schedule_timeout(5*HZ) == 0)
1746 status = -EAGAIN;
1747 else
1748 status = 0;
1749 } else
1750 status = -EINTR;
1751 finish_wait(&state->waitq, &wait);
1752 rcu_read_lock();
1753 spin_lock(&state->owner->so_lock);
1754 write_seqlock(&state->seqlock);
1755 }
1756
1757 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1758 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1759 nfs4_stateid_copy(freeme, &state->open_stateid);
1760 nfs_test_and_clear_all_open_stateid(state);
1761 }
1762
1763 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1764 nfs4_stateid_copy(&state->stateid, stateid);
1765 nfs4_stateid_copy(&state->open_stateid, stateid);
1766 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1767 nfs_state_log_update_open_stateid(state);
1768 }
1769
nfs_state_set_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,fmode_t fmode,nfs4_stateid * freeme)1770 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1771 const nfs4_stateid *open_stateid,
1772 fmode_t fmode,
1773 nfs4_stateid *freeme)
1774 {
1775 /*
1776 * Protect the call to nfs4_state_set_mode_locked and
1777 * serialise the stateid update
1778 */
1779 write_seqlock(&state->seqlock);
1780 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1781 switch (fmode) {
1782 case FMODE_READ:
1783 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1784 break;
1785 case FMODE_WRITE:
1786 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1787 break;
1788 case FMODE_READ|FMODE_WRITE:
1789 set_bit(NFS_O_RDWR_STATE, &state->flags);
1790 }
1791 set_bit(NFS_OPEN_STATE, &state->flags);
1792 write_sequnlock(&state->seqlock);
1793 }
1794
nfs_state_clear_open_state_flags(struct nfs4_state * state)1795 void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1796 {
1797 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1798 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1799 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1800 clear_bit(NFS_OPEN_STATE, &state->flags);
1801 }
1802
nfs_state_set_delegation(struct nfs4_state * state,const nfs4_stateid * deleg_stateid,fmode_t fmode)1803 static void nfs_state_set_delegation(struct nfs4_state *state,
1804 const nfs4_stateid *deleg_stateid,
1805 fmode_t fmode)
1806 {
1807 /*
1808 * Protect the call to nfs4_state_set_mode_locked and
1809 * serialise the stateid update
1810 */
1811 write_seqlock(&state->seqlock);
1812 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1813 set_bit(NFS_DELEGATED_STATE, &state->flags);
1814 write_sequnlock(&state->seqlock);
1815 }
1816
nfs_state_clear_delegation(struct nfs4_state * state)1817 void nfs_state_clear_delegation(struct nfs4_state *state)
1818 {
1819 write_seqlock(&state->seqlock);
1820 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1821 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1822 write_sequnlock(&state->seqlock);
1823 }
1824
update_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,const nfs4_stateid * delegation,fmode_t fmode)1825 int update_open_stateid(struct nfs4_state *state,
1826 const nfs4_stateid *open_stateid,
1827 const nfs4_stateid *delegation,
1828 fmode_t fmode)
1829 {
1830 struct nfs_server *server = NFS_SERVER(state->inode);
1831 struct nfs_client *clp = server->nfs_client;
1832 struct nfs_delegation *deleg_cur;
1833 nfs4_stateid freeme = { };
1834 int ret = 0;
1835
1836 fmode &= (FMODE_READ|FMODE_WRITE);
1837
1838 spin_lock(&state->owner->so_lock);
1839 if (open_stateid != NULL) {
1840 rcu_read_lock();
1841 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1842 rcu_read_unlock();
1843 ret = 1;
1844 }
1845
1846 deleg_cur = nfs4_get_valid_delegation(state->inode);
1847 if (deleg_cur == NULL)
1848 goto no_delegation;
1849
1850 spin_lock(&deleg_cur->lock);
1851 if (!deleg_cur->inode ||
1852 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1853 (deleg_cur->type & fmode) != fmode)
1854 goto no_delegation_unlock;
1855
1856 if (delegation == NULL)
1857 delegation = &deleg_cur->stateid;
1858 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1859 goto no_delegation_unlock;
1860
1861 nfs_mark_delegation_referenced(deleg_cur);
1862 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1863 ret = 1;
1864 no_delegation_unlock:
1865 spin_unlock(&deleg_cur->lock);
1866 nfs_put_delegation(deleg_cur);
1867 no_delegation:
1868 if (ret)
1869 update_open_stateflags(state, fmode);
1870 spin_unlock(&state->owner->so_lock);
1871
1872 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1873 nfs4_schedule_state_manager(clp);
1874 if (freeme.type != 0)
1875 nfs4_test_and_free_stateid(server, &freeme,
1876 state->owner->so_cred);
1877
1878 return ret;
1879 }
1880
nfs4_update_lock_stateid(struct nfs4_lock_state * lsp,const nfs4_stateid * stateid)1881 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1882 const nfs4_stateid *stateid)
1883 {
1884 struct nfs4_state *state = lsp->ls_state;
1885 bool ret = false;
1886
1887 spin_lock(&state->state_lock);
1888 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1889 goto out_noupdate;
1890 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1891 goto out_noupdate;
1892 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1893 ret = true;
1894 out_noupdate:
1895 spin_unlock(&state->state_lock);
1896 return ret;
1897 }
1898
nfs4_return_incompatible_delegation(struct inode * inode,fmode_t fmode)1899 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1900 {
1901 struct nfs_delegation *delegation;
1902
1903 fmode &= FMODE_READ|FMODE_WRITE;
1904 delegation = nfs4_get_valid_delegation(inode);
1905 if (!delegation)
1906 return;
1907 if ((delegation->type & fmode) != fmode)
1908 nfs4_inode_return_delegation(inode);
1909 nfs_put_delegation(delegation);
1910 }
1911
nfs4_try_open_cached(struct nfs4_opendata * opendata)1912 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1913 {
1914 struct nfs4_state *state = opendata->state;
1915 int open_mode = opendata->o_arg.open_flags;
1916 fmode_t fmode = opendata->o_arg.fmode;
1917 enum open_claim_type4 claim = opendata->o_arg.claim;
1918 nfs4_stateid stateid;
1919 int ret = -EAGAIN;
1920
1921 for (;;) {
1922 spin_lock(&state->owner->so_lock);
1923 if (can_open_cached(state, fmode, open_mode, claim)) {
1924 update_open_stateflags(state, fmode);
1925 spin_unlock(&state->owner->so_lock);
1926 goto out_return_state;
1927 }
1928 spin_unlock(&state->owner->so_lock);
1929
1930 if (!can_open_delegated(state->inode, fmode, claim, &stateid))
1931 break;
1932
1933 nfs_release_seqid(opendata->o_arg.seqid);
1934 if (!opendata->is_recover) {
1935 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1936 if (ret != 0)
1937 goto out;
1938 }
1939 ret = -EAGAIN;
1940
1941 /* Try to update the stateid using the delegation */
1942 if (update_open_stateid(state, NULL, &stateid, fmode))
1943 goto out_return_state;
1944 }
1945 out:
1946 return ERR_PTR(ret);
1947 out_return_state:
1948 refcount_inc(&state->count);
1949 return state;
1950 }
1951
1952 static void
nfs4_process_delegation(struct inode * inode,const struct cred * cred,enum open_claim_type4 claim,const struct nfs4_open_delegation * delegation)1953 nfs4_process_delegation(struct inode *inode, const struct cred *cred,
1954 enum open_claim_type4 claim,
1955 const struct nfs4_open_delegation *delegation)
1956 {
1957 switch (delegation->open_delegation_type) {
1958 case NFS4_OPEN_DELEGATE_READ:
1959 case NFS4_OPEN_DELEGATE_WRITE:
1960 case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
1961 case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
1962 break;
1963 default:
1964 return;
1965 }
1966 switch (claim) {
1967 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1968 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1969 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1970 "returning a delegation for "
1971 "OPEN(CLAIM_DELEGATE_CUR)\n",
1972 NFS_SERVER(inode)->nfs_client->cl_hostname);
1973 break;
1974 case NFS4_OPEN_CLAIM_PREVIOUS:
1975 nfs_inode_reclaim_delegation(inode, cred, delegation->type,
1976 &delegation->stateid,
1977 delegation->pagemod_limit,
1978 delegation->open_delegation_type);
1979 break;
1980 default:
1981 nfs_inode_set_delegation(inode, cred, delegation->type,
1982 &delegation->stateid,
1983 delegation->pagemod_limit,
1984 delegation->open_delegation_type);
1985 }
1986 if (delegation->do_recall)
1987 nfs_async_inode_return_delegation(inode, &delegation->stateid);
1988 }
1989
1990 /*
1991 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1992 * and update the nfs4_state.
1993 */
1994 static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata * data)1995 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1996 {
1997 struct inode *inode = data->state->inode;
1998 struct nfs4_state *state = data->state;
1999 int ret;
2000
2001 if (!data->rpc_done) {
2002 if (data->rpc_status)
2003 return ERR_PTR(data->rpc_status);
2004 return nfs4_try_open_cached(data);
2005 }
2006
2007 ret = nfs_refresh_inode(inode, &data->f_attr);
2008 if (ret)
2009 return ERR_PTR(ret);
2010
2011 nfs4_process_delegation(state->inode,
2012 data->owner->so_cred,
2013 data->o_arg.claim,
2014 &data->o_res.delegation);
2015
2016 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2017 if (!update_open_stateid(state, &data->o_res.stateid,
2018 NULL, data->o_arg.fmode))
2019 return ERR_PTR(-EAGAIN);
2020 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode))
2021 return ERR_PTR(-EAGAIN);
2022 refcount_inc(&state->count);
2023
2024 return state;
2025 }
2026
2027 static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata * data)2028 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2029 {
2030 struct inode *inode;
2031
2032 switch (data->o_arg.claim) {
2033 case NFS4_OPEN_CLAIM_NULL:
2034 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2035 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2036 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2037 return ERR_PTR(-EAGAIN);
2038 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2039 &data->f_attr);
2040 break;
2041 default:
2042 inode = d_inode(data->dentry);
2043 ihold(inode);
2044 nfs_refresh_inode(inode, &data->f_attr);
2045 }
2046 return inode;
2047 }
2048
2049 static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata * data)2050 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2051 {
2052 struct nfs4_state *state;
2053 struct inode *inode;
2054
2055 inode = nfs4_opendata_get_inode(data);
2056 if (IS_ERR(inode))
2057 return ERR_CAST(inode);
2058 if (data->state != NULL && data->state->inode == inode) {
2059 state = data->state;
2060 refcount_inc(&state->count);
2061 } else
2062 state = nfs4_get_open_state(inode, data->owner);
2063 iput(inode);
2064 if (state == NULL)
2065 state = ERR_PTR(-ENOMEM);
2066 return state;
2067 }
2068
2069 static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2070 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2071 {
2072 struct nfs4_state *state;
2073
2074 if (!data->rpc_done) {
2075 state = nfs4_try_open_cached(data);
2076 trace_nfs4_cached_open(data->state);
2077 goto out;
2078 }
2079
2080 state = nfs4_opendata_find_nfs4_state(data);
2081 if (IS_ERR(state))
2082 goto out;
2083
2084 nfs4_process_delegation(state->inode,
2085 data->owner->so_cred,
2086 data->o_arg.claim,
2087 &data->o_res.delegation);
2088
2089 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2090 if (!update_open_stateid(state, &data->o_res.stateid,
2091 NULL, data->o_arg.fmode)) {
2092 nfs4_put_open_state(state);
2093 state = ERR_PTR(-EAGAIN);
2094 }
2095 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode)) {
2096 nfs4_put_open_state(state);
2097 state = ERR_PTR(-EAGAIN);
2098 }
2099 out:
2100 nfs_release_seqid(data->o_arg.seqid);
2101 return state;
2102 }
2103
2104 static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2105 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2106 {
2107 struct nfs4_state *ret;
2108
2109 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2110 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2111 else
2112 ret = _nfs4_opendata_to_nfs4_state(data);
2113 nfs4_sequence_free_slot(&data->o_res.seq_res);
2114 return ret;
2115 }
2116
2117 static struct nfs_open_context *
nfs4_state_find_open_context_mode(struct nfs4_state * state,fmode_t mode)2118 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2119 {
2120 struct nfs_inode *nfsi = NFS_I(state->inode);
2121 struct nfs_open_context *ctx;
2122
2123 rcu_read_lock();
2124 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2125 if (ctx->state != state)
2126 continue;
2127 if ((ctx->mode & mode) != mode)
2128 continue;
2129 if (!get_nfs_open_context(ctx))
2130 continue;
2131 rcu_read_unlock();
2132 return ctx;
2133 }
2134 rcu_read_unlock();
2135 return ERR_PTR(-ENOENT);
2136 }
2137
2138 static struct nfs_open_context *
nfs4_state_find_open_context(struct nfs4_state * state)2139 nfs4_state_find_open_context(struct nfs4_state *state)
2140 {
2141 struct nfs_open_context *ctx;
2142
2143 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2144 if (!IS_ERR(ctx))
2145 return ctx;
2146 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2147 if (!IS_ERR(ctx))
2148 return ctx;
2149 return nfs4_state_find_open_context_mode(state, FMODE_READ);
2150 }
2151
nfs4_open_recoverdata_alloc(struct nfs_open_context * ctx,struct nfs4_state * state,enum open_claim_type4 claim)2152 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2153 struct nfs4_state *state, enum open_claim_type4 claim)
2154 {
2155 struct nfs4_opendata *opendata;
2156
2157 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2158 NULL, claim, GFP_NOFS);
2159 if (opendata == NULL)
2160 return ERR_PTR(-ENOMEM);
2161 opendata->state = state;
2162 refcount_inc(&state->count);
2163 return opendata;
2164 }
2165
nfs4_open_recover_helper(struct nfs4_opendata * opendata,fmode_t fmode)2166 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2167 fmode_t fmode)
2168 {
2169 struct nfs4_state *newstate;
2170 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2171 int openflags = opendata->o_arg.open_flags;
2172 int ret;
2173
2174 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2175 return 0;
2176 opendata->o_arg.fmode = fmode;
2177 opendata->o_arg.share_access =
2178 nfs4_map_atomic_open_share(server, fmode, openflags);
2179 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2180 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2181 nfs4_init_opendata_res(opendata);
2182 ret = _nfs4_recover_proc_open(opendata);
2183 if (ret != 0)
2184 return ret;
2185 newstate = nfs4_opendata_to_nfs4_state(opendata);
2186 if (IS_ERR(newstate))
2187 return PTR_ERR(newstate);
2188 if (newstate != opendata->state)
2189 ret = -ESTALE;
2190 nfs4_close_state(newstate, fmode);
2191 return ret;
2192 }
2193
nfs4_open_recover(struct nfs4_opendata * opendata,struct nfs4_state * state)2194 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2195 {
2196 int ret;
2197
2198 /* memory barrier prior to reading state->n_* */
2199 smp_rmb();
2200 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2201 if (ret != 0)
2202 return ret;
2203 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2204 if (ret != 0)
2205 return ret;
2206 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2207 if (ret != 0)
2208 return ret;
2209 /*
2210 * We may have performed cached opens for all three recoveries.
2211 * Check if we need to update the current stateid.
2212 */
2213 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2214 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2215 write_seqlock(&state->seqlock);
2216 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2217 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2218 write_sequnlock(&state->seqlock);
2219 }
2220 return 0;
2221 }
2222
2223 /*
2224 * OPEN_RECLAIM:
2225 * reclaim state on the server after a reboot.
2226 */
_nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2227 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2228 {
2229 struct nfs_delegation *delegation;
2230 struct nfs4_opendata *opendata;
2231 u32 delegation_type = NFS4_OPEN_DELEGATE_NONE;
2232 int status;
2233
2234 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2235 NFS4_OPEN_CLAIM_PREVIOUS);
2236 if (IS_ERR(opendata))
2237 return PTR_ERR(opendata);
2238 rcu_read_lock();
2239 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2240 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) {
2241 switch(delegation->type) {
2242 case FMODE_READ:
2243 delegation_type = NFS4_OPEN_DELEGATE_READ;
2244 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2245 delegation_type = NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG;
2246 break;
2247 case FMODE_WRITE:
2248 case FMODE_READ|FMODE_WRITE:
2249 delegation_type = NFS4_OPEN_DELEGATE_WRITE;
2250 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2251 delegation_type = NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG;
2252 }
2253 }
2254 rcu_read_unlock();
2255 opendata->o_arg.u.delegation_type = delegation_type;
2256 status = nfs4_open_recover(opendata, state);
2257 nfs4_opendata_put(opendata);
2258 return status;
2259 }
2260
nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2261 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2262 {
2263 struct nfs_server *server = NFS_SERVER(state->inode);
2264 struct nfs4_exception exception = { };
2265 int err;
2266 do {
2267 err = _nfs4_do_open_reclaim(ctx, state);
2268 trace_nfs4_open_reclaim(ctx, 0, err);
2269 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2270 continue;
2271 if (err != -NFS4ERR_DELAY)
2272 break;
2273 nfs4_handle_exception(server, err, &exception);
2274 } while (exception.retry);
2275 return err;
2276 }
2277
nfs4_open_reclaim(struct nfs4_state_owner * sp,struct nfs4_state * state)2278 int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2279 {
2280 struct nfs_open_context *ctx;
2281 int ret;
2282
2283 ctx = nfs4_state_find_open_context(state);
2284 if (IS_ERR(ctx))
2285 return -EAGAIN;
2286 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2287 nfs_state_clear_open_state_flags(state);
2288 ret = nfs4_do_open_reclaim(ctx, state);
2289 put_nfs_open_context(ctx);
2290 return ret;
2291 }
2292
nfs4_handle_delegation_recall_error(struct nfs_server * server,struct nfs4_state * state,const nfs4_stateid * stateid,struct file_lock * fl,int err)2293 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)
2294 {
2295 switch (err) {
2296 default:
2297 printk(KERN_ERR "NFS: %s: unhandled error "
2298 "%d.\n", __func__, err);
2299 fallthrough;
2300 case 0:
2301 case -ENOENT:
2302 case -EAGAIN:
2303 case -ESTALE:
2304 case -ETIMEDOUT:
2305 break;
2306 case -NFS4ERR_BADSESSION:
2307 case -NFS4ERR_BADSLOT:
2308 case -NFS4ERR_BAD_HIGH_SLOT:
2309 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2310 case -NFS4ERR_DEADSESSION:
2311 return -EAGAIN;
2312 case -NFS4ERR_STALE_CLIENTID:
2313 case -NFS4ERR_STALE_STATEID:
2314 /* Don't recall a delegation if it was lost */
2315 nfs4_schedule_lease_recovery(server->nfs_client);
2316 return -EAGAIN;
2317 case -NFS4ERR_MOVED:
2318 nfs4_schedule_migration_recovery(server);
2319 return -EAGAIN;
2320 case -NFS4ERR_LEASE_MOVED:
2321 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2322 return -EAGAIN;
2323 case -NFS4ERR_DELEG_REVOKED:
2324 case -NFS4ERR_ADMIN_REVOKED:
2325 case -NFS4ERR_EXPIRED:
2326 case -NFS4ERR_BAD_STATEID:
2327 case -NFS4ERR_OPENMODE:
2328 nfs_inode_find_state_and_recover(state->inode,
2329 stateid);
2330 nfs4_schedule_stateid_recovery(server, state);
2331 return -EAGAIN;
2332 case -NFS4ERR_DELAY:
2333 case -NFS4ERR_GRACE:
2334 ssleep(1);
2335 return -EAGAIN;
2336 case -ENOMEM:
2337 case -NFS4ERR_DENIED:
2338 if (fl) {
2339 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2340 if (lsp)
2341 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2342 }
2343 return 0;
2344 }
2345 return err;
2346 }
2347
nfs4_open_delegation_recall(struct nfs_open_context * ctx,struct nfs4_state * state,const nfs4_stateid * stateid)2348 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2349 struct nfs4_state *state, const nfs4_stateid *stateid)
2350 {
2351 struct nfs_server *server = NFS_SERVER(state->inode);
2352 struct nfs4_opendata *opendata;
2353 int err = 0;
2354
2355 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2356 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2357 if (IS_ERR(opendata))
2358 return PTR_ERR(opendata);
2359 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2360 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2361 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2362 if (err)
2363 goto out;
2364 }
2365 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2366 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2367 if (err)
2368 goto out;
2369 }
2370 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2371 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2372 if (err)
2373 goto out;
2374 }
2375 nfs_state_clear_delegation(state);
2376 out:
2377 nfs4_opendata_put(opendata);
2378 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2379 }
2380
nfs4_open_confirm_prepare(struct rpc_task * task,void * calldata)2381 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2382 {
2383 struct nfs4_opendata *data = calldata;
2384
2385 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2386 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2387 }
2388
nfs4_open_confirm_done(struct rpc_task * task,void * calldata)2389 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2390 {
2391 struct nfs4_opendata *data = calldata;
2392
2393 data->c_res.seq_res.sr_slot_ops->done(task, &data->c_res.seq_res);
2394
2395 data->rpc_status = task->tk_status;
2396 if (data->rpc_status == 0) {
2397 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2398 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2399 renew_lease(data->o_res.server, data->timestamp);
2400 data->rpc_done = true;
2401 }
2402 }
2403
nfs4_open_confirm_release(void * calldata)2404 static void nfs4_open_confirm_release(void *calldata)
2405 {
2406 struct nfs4_opendata *data = calldata;
2407 struct nfs4_state *state = NULL;
2408
2409 /* If this request hasn't been cancelled, do nothing */
2410 if (!data->cancelled)
2411 goto out_free;
2412 /* In case of error, no cleanup! */
2413 if (!data->rpc_done)
2414 goto out_free;
2415 state = nfs4_opendata_to_nfs4_state(data);
2416 if (!IS_ERR(state))
2417 nfs4_close_state(state, data->o_arg.fmode);
2418 out_free:
2419 nfs4_opendata_put(data);
2420 }
2421
2422 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2423 .rpc_call_prepare = nfs4_open_confirm_prepare,
2424 .rpc_call_done = nfs4_open_confirm_done,
2425 .rpc_release = nfs4_open_confirm_release,
2426 };
2427
2428 /*
2429 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2430 */
_nfs4_proc_open_confirm(struct nfs4_opendata * data)2431 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2432 {
2433 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2434 struct rpc_task *task;
2435 struct rpc_message msg = {
2436 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2437 .rpc_argp = &data->c_arg,
2438 .rpc_resp = &data->c_res,
2439 .rpc_cred = data->owner->so_cred,
2440 };
2441 struct rpc_task_setup task_setup_data = {
2442 .rpc_client = server->client,
2443 .rpc_message = &msg,
2444 .callback_ops = &nfs4_open_confirm_ops,
2445 .callback_data = data,
2446 .workqueue = nfsiod_workqueue,
2447 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2448 };
2449 int status;
2450
2451 nfs4_init_sequence(server->nfs_client, &data->c_arg.seq_args,
2452 &data->c_res.seq_res, 1, data->is_recover);
2453 kref_get(&data->kref);
2454 data->rpc_done = false;
2455 data->rpc_status = 0;
2456 data->timestamp = jiffies;
2457 task = rpc_run_task(&task_setup_data);
2458 if (IS_ERR(task))
2459 return PTR_ERR(task);
2460 status = rpc_wait_for_completion_task(task);
2461 if (status != 0) {
2462 data->cancelled = true;
2463 smp_wmb();
2464 } else
2465 status = data->rpc_status;
2466 rpc_put_task(task);
2467 return status;
2468 }
2469
nfs4_open_prepare(struct rpc_task * task,void * calldata)2470 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2471 {
2472 struct nfs4_opendata *data = calldata;
2473 struct nfs4_state_owner *sp = data->owner;
2474 struct nfs_client *clp = sp->so_server->nfs_client;
2475 enum open_claim_type4 claim = data->o_arg.claim;
2476
2477 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2478 goto out_wait;
2479 /*
2480 * Check if we still need to send an OPEN call, or if we can use
2481 * a delegation instead.
2482 */
2483 if (data->state != NULL) {
2484 if (can_open_cached(data->state, data->o_arg.fmode,
2485 data->o_arg.open_flags, claim))
2486 goto out_no_action;
2487 if (can_open_delegated(data->state->inode, data->o_arg.fmode,
2488 claim, NULL)) {
2489 trace_nfs4_cached_open(data->state);
2490 goto out_no_action;
2491 }
2492 }
2493 /* Update client id. */
2494 data->o_arg.clientid = clp->cl_clientid;
2495 switch (claim) {
2496 default:
2497 break;
2498 case NFS4_OPEN_CLAIM_PREVIOUS:
2499 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2500 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2501 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2502 fallthrough;
2503 case NFS4_OPEN_CLAIM_FH:
2504 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2505 }
2506 data->timestamp = jiffies;
2507 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2508 &data->o_arg.seq_args,
2509 &data->o_res.seq_res,
2510 task) != 0)
2511 nfs_release_seqid(data->o_arg.seqid);
2512
2513 /* Set the create mode (note dependency on the session type) */
2514 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2515 if (data->o_arg.open_flags & O_EXCL) {
2516 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2517 if (clp->cl_mvops->minor_version == 0) {
2518 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2519 /* don't put an ACCESS op in OPEN compound if O_EXCL,
2520 * because ACCESS will return permission denied for
2521 * all bits until close */
2522 data->o_res.access_request = data->o_arg.access = 0;
2523 } else if (nfs4_has_persistent_session(clp))
2524 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2525 }
2526 return;
2527
2528 out_no_action:
2529 task->tk_action = NULL;
2530 out_wait:
2531 nfs4_sequence_done(task, &data->o_res.seq_res);
2532 }
2533
nfs4_open_done(struct rpc_task * task,void * calldata)2534 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2535 {
2536 struct nfs4_opendata *data = calldata;
2537
2538 data->rpc_status = task->tk_status;
2539
2540 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2541 return;
2542
2543 if (task->tk_status == 0) {
2544 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2545 switch (data->o_res.f_attr->mode & S_IFMT) {
2546 case S_IFREG:
2547 break;
2548 case S_IFLNK:
2549 data->rpc_status = -ELOOP;
2550 break;
2551 case S_IFDIR:
2552 data->rpc_status = -EISDIR;
2553 break;
2554 default:
2555 data->rpc_status = -ENOTDIR;
2556 }
2557 }
2558 renew_lease(data->o_res.server, data->timestamp);
2559 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2560 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2561 }
2562 data->rpc_done = true;
2563 }
2564
nfs4_open_release(void * calldata)2565 static void nfs4_open_release(void *calldata)
2566 {
2567 struct nfs4_opendata *data = calldata;
2568 struct nfs4_state *state = NULL;
2569
2570 /* In case of error, no cleanup! */
2571 if (data->rpc_status != 0 || !data->rpc_done) {
2572 nfs_release_seqid(data->o_arg.seqid);
2573 goto out_free;
2574 }
2575 /* If this request hasn't been cancelled, do nothing */
2576 if (!data->cancelled)
2577 goto out_free;
2578 /* In case we need an open_confirm, no cleanup! */
2579 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2580 goto out_free;
2581 state = nfs4_opendata_to_nfs4_state(data);
2582 if (!IS_ERR(state))
2583 nfs4_close_state(state, data->o_arg.fmode);
2584 out_free:
2585 nfs4_opendata_put(data);
2586 }
2587
2588 static const struct rpc_call_ops nfs4_open_ops = {
2589 .rpc_call_prepare = nfs4_open_prepare,
2590 .rpc_call_done = nfs4_open_done,
2591 .rpc_release = nfs4_open_release,
2592 };
2593
nfs4_run_open_task(struct nfs4_opendata * data,struct nfs_open_context * ctx)2594 static int nfs4_run_open_task(struct nfs4_opendata *data,
2595 struct nfs_open_context *ctx)
2596 {
2597 struct inode *dir = d_inode(data->dir);
2598 struct nfs_server *server = NFS_SERVER(dir);
2599 struct nfs_client *clp = server->nfs_client;
2600 struct nfs_openargs *o_arg = &data->o_arg;
2601 struct nfs_openres *o_res = &data->o_res;
2602 struct rpc_task *task;
2603 struct rpc_message msg = {
2604 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2605 .rpc_argp = o_arg,
2606 .rpc_resp = o_res,
2607 .rpc_cred = data->owner->so_cred,
2608 };
2609 struct rpc_task_setup task_setup_data = {
2610 .rpc_client = server->client,
2611 .rpc_message = &msg,
2612 .callback_ops = &nfs4_open_ops,
2613 .callback_data = data,
2614 .workqueue = nfsiod_workqueue,
2615 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2616 };
2617 int status;
2618
2619 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2620 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2621
2622 kref_get(&data->kref);
2623 data->rpc_done = false;
2624 data->rpc_status = 0;
2625 data->cancelled = false;
2626 data->is_recover = false;
2627 if (!ctx) {
2628 nfs4_init_sequence(clp, &o_arg->seq_args, &o_res->seq_res, 1, 1);
2629 data->is_recover = true;
2630 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2631 } else {
2632 nfs4_init_sequence(clp, &o_arg->seq_args, &o_res->seq_res, 1, 0);
2633 pnfs_lgopen_prepare(data, ctx);
2634 }
2635 task = rpc_run_task(&task_setup_data);
2636 if (IS_ERR(task))
2637 return PTR_ERR(task);
2638 status = rpc_wait_for_completion_task(task);
2639 if (status != 0) {
2640 data->cancelled = true;
2641 smp_wmb();
2642 } else
2643 status = data->rpc_status;
2644 rpc_put_task(task);
2645
2646 return status;
2647 }
2648
_nfs4_recover_proc_open(struct nfs4_opendata * data)2649 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2650 {
2651 struct inode *dir = d_inode(data->dir);
2652 struct nfs_openres *o_res = &data->o_res;
2653 int status;
2654
2655 status = nfs4_run_open_task(data, NULL);
2656 if (status != 0 || !data->rpc_done)
2657 return status;
2658
2659 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2660
2661 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2662 status = _nfs4_proc_open_confirm(data);
2663
2664 return status;
2665 }
2666
2667 /*
2668 * Additional permission checks in order to distinguish between an
2669 * open for read, and an open for execute. This works around the
2670 * fact that NFSv4 OPEN treats read and execute permissions as being
2671 * the same.
2672 * Note that in the non-execute case, we want to turn off permission
2673 * checking if we just created a new file (POSIX open() semantics).
2674 */
nfs4_opendata_access(const struct cred * cred,struct nfs4_opendata * opendata,struct nfs4_state * state,fmode_t fmode)2675 static int nfs4_opendata_access(const struct cred *cred,
2676 struct nfs4_opendata *opendata,
2677 struct nfs4_state *state, fmode_t fmode)
2678 {
2679 struct nfs_access_entry cache;
2680 u32 mask, flags;
2681
2682 /* access call failed or for some reason the server doesn't
2683 * support any access modes -- defer access call until later */
2684 if (opendata->o_res.access_supported == 0)
2685 return 0;
2686
2687 mask = 0;
2688 if (fmode & FMODE_EXEC) {
2689 /* ONLY check for exec rights */
2690 if (S_ISDIR(state->inode->i_mode))
2691 mask = NFS4_ACCESS_LOOKUP;
2692 else
2693 mask = NFS4_ACCESS_EXECUTE;
2694 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2695 mask = NFS4_ACCESS_READ;
2696
2697 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2698 nfs_access_add_cache(state->inode, &cache, cred);
2699
2700 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2701 if ((mask & ~cache.mask & flags) == 0)
2702 return 0;
2703
2704 return -EACCES;
2705 }
2706
2707 /*
2708 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2709 */
_nfs4_proc_open(struct nfs4_opendata * data,struct nfs_open_context * ctx)2710 static int _nfs4_proc_open(struct nfs4_opendata *data,
2711 struct nfs_open_context *ctx)
2712 {
2713 struct inode *dir = d_inode(data->dir);
2714 struct nfs_server *server = NFS_SERVER(dir);
2715 struct nfs_openargs *o_arg = &data->o_arg;
2716 struct nfs_openres *o_res = &data->o_res;
2717 int status;
2718
2719 status = nfs4_run_open_task(data, ctx);
2720 if (!data->rpc_done)
2721 return status;
2722 if (status != 0) {
2723 if (status == -NFS4ERR_BADNAME &&
2724 !(o_arg->open_flags & O_CREAT))
2725 return -ENOENT;
2726 return status;
2727 }
2728
2729 nfs_fattr_map_and_free_names(server, &data->f_attr);
2730
2731 if (o_arg->open_flags & O_CREAT) {
2732 if (o_arg->open_flags & O_EXCL)
2733 data->file_created = true;
2734 else if (o_res->cinfo.before != o_res->cinfo.after)
2735 data->file_created = true;
2736 if (data->file_created ||
2737 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2738 nfs4_update_changeattr(dir, &o_res->cinfo,
2739 o_res->f_attr->time_start,
2740 NFS_INO_INVALID_DATA);
2741 }
2742 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2743 server->caps &= ~NFS_CAP_POSIX_LOCK;
2744 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2745 status = _nfs4_proc_open_confirm(data);
2746 if (status != 0)
2747 return status;
2748 }
2749 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2750 struct nfs_fh *fh = &o_res->fh;
2751
2752 nfs4_sequence_free_slot(&o_res->seq_res);
2753 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2754 fh = NFS_FH(d_inode(data->dentry));
2755 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2756 }
2757 return 0;
2758 }
2759
2760 /*
2761 * OPEN_EXPIRED:
2762 * reclaim state on the server after a network partition.
2763 * Assumes caller holds the appropriate lock
2764 */
_nfs4_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2765 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2766 {
2767 struct nfs4_opendata *opendata;
2768 int ret;
2769
2770 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2771 if (IS_ERR(opendata))
2772 return PTR_ERR(opendata);
2773 /*
2774 * We're not recovering a delegation, so ask for no delegation.
2775 * Otherwise the recovery thread could deadlock with an outstanding
2776 * delegation return.
2777 */
2778 opendata->o_arg.open_flags = O_DIRECT;
2779 ret = nfs4_open_recover(opendata, state);
2780 if (ret == -ESTALE)
2781 d_drop(ctx->dentry);
2782 nfs4_opendata_put(opendata);
2783 return ret;
2784 }
2785
nfs4_do_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2786 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2787 {
2788 struct nfs_server *server = NFS_SERVER(state->inode);
2789 struct nfs4_exception exception = { };
2790 int err;
2791
2792 do {
2793 err = _nfs4_open_expired(ctx, state);
2794 trace_nfs4_open_expired(ctx, 0, err);
2795 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2796 continue;
2797 switch (err) {
2798 default:
2799 goto out;
2800 case -NFS4ERR_GRACE:
2801 case -NFS4ERR_DELAY:
2802 nfs4_handle_exception(server, err, &exception);
2803 err = 0;
2804 }
2805 } while (exception.retry);
2806 out:
2807 return err;
2808 }
2809
nfs4_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2810 int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2811 {
2812 struct nfs_open_context *ctx;
2813 int ret;
2814
2815 ctx = nfs4_state_find_open_context(state);
2816 if (IS_ERR(ctx))
2817 return -EAGAIN;
2818 ret = nfs4_do_open_expired(ctx, state);
2819 put_nfs_open_context(ctx);
2820 return ret;
2821 }
2822
nfs_finish_clear_delegation_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)2823 void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2824 const nfs4_stateid *stateid)
2825 {
2826 nfs_remove_bad_delegation(state->inode, stateid);
2827 nfs_state_clear_delegation(state);
2828 }
2829
nfs41_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2830 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2831 nfs4_stateid *stateid, const struct cred *cred)
2832 {
2833 int status;
2834
2835 switch (stateid->type) {
2836 default:
2837 break;
2838 case NFS4_INVALID_STATEID_TYPE:
2839 case NFS4_SPECIAL_STATEID_TYPE:
2840 case NFS4_FREED_STATEID_TYPE:
2841 return -NFS4ERR_BAD_STATEID;
2842 case NFS4_REVOKED_STATEID_TYPE:
2843 goto out_free;
2844 }
2845
2846 status = nfs41_test_stateid(server, stateid, cred);
2847 switch (status) {
2848 case -NFS4ERR_EXPIRED:
2849 case -NFS4ERR_ADMIN_REVOKED:
2850 case -NFS4ERR_DELEG_REVOKED:
2851 break;
2852 default:
2853 return status;
2854 }
2855 out_free:
2856 /* Ack the revoked state to the server */
2857 nfs41_free_stateid(server, stateid, cred, true);
2858 return -NFS4ERR_EXPIRED;
2859 }
2860
nfs41_check_delegation_stateid(struct nfs4_state * state)2861 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2862 {
2863 struct nfs_server *server = NFS_SERVER(state->inode);
2864 nfs4_stateid stateid;
2865 struct nfs_delegation *delegation;
2866 const struct cred *cred = NULL;
2867 int status, ret = NFS_OK;
2868
2869 /* Get the delegation credential for use by test/free_stateid */
2870 rcu_read_lock();
2871 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2872 if (delegation == NULL) {
2873 rcu_read_unlock();
2874 nfs_state_clear_delegation(state);
2875 return NFS_OK;
2876 }
2877
2878 spin_lock(&delegation->lock);
2879 nfs4_stateid_copy(&stateid, &delegation->stateid);
2880
2881 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2882 &delegation->flags)) {
2883 spin_unlock(&delegation->lock);
2884 rcu_read_unlock();
2885 return NFS_OK;
2886 }
2887
2888 if (delegation->cred)
2889 cred = get_cred(delegation->cred);
2890 spin_unlock(&delegation->lock);
2891 rcu_read_unlock();
2892 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2893 trace_nfs4_test_delegation_stateid(state, NULL, status);
2894 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2895 nfs_finish_clear_delegation_stateid(state, &stateid);
2896 else
2897 ret = status;
2898
2899 put_cred(cred);
2900 return ret;
2901 }
2902
nfs41_delegation_recover_stateid(struct nfs4_state * state)2903 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2904 {
2905 nfs4_stateid tmp;
2906
2907 if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2908 nfs4_copy_delegation_stateid(state->inode, state->state,
2909 &tmp, NULL) &&
2910 nfs4_stateid_match_other(&state->stateid, &tmp))
2911 nfs_state_set_delegation(state, &tmp, state->state);
2912 else
2913 nfs_state_clear_delegation(state);
2914 }
2915
2916 /**
2917 * nfs41_check_expired_locks - possibly free a lock stateid
2918 *
2919 * @state: NFSv4 state for an inode
2920 *
2921 * Returns NFS_OK if recovery for this stateid is now finished.
2922 * Otherwise a negative NFS4ERR value is returned.
2923 */
nfs41_check_expired_locks(struct nfs4_state * state)2924 static int nfs41_check_expired_locks(struct nfs4_state *state)
2925 {
2926 int status, ret = NFS_OK;
2927 struct nfs4_lock_state *lsp, *prev = NULL;
2928 struct nfs_server *server = NFS_SERVER(state->inode);
2929
2930 if (!test_bit(LK_STATE_IN_USE, &state->flags))
2931 goto out;
2932
2933 spin_lock(&state->state_lock);
2934 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2935 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2936 const struct cred *cred = lsp->ls_state->owner->so_cred;
2937
2938 refcount_inc(&lsp->ls_count);
2939 spin_unlock(&state->state_lock);
2940
2941 nfs4_put_lock_state(prev);
2942 prev = lsp;
2943
2944 status = nfs41_test_and_free_expired_stateid(server,
2945 &lsp->ls_stateid,
2946 cred);
2947 trace_nfs4_test_lock_stateid(state, lsp, status);
2948 if (status == -NFS4ERR_EXPIRED ||
2949 status == -NFS4ERR_BAD_STATEID) {
2950 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2951 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2952 if (!recover_lost_locks)
2953 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2954 } else if (status != NFS_OK) {
2955 ret = status;
2956 nfs4_put_lock_state(prev);
2957 goto out;
2958 }
2959 spin_lock(&state->state_lock);
2960 }
2961 }
2962 spin_unlock(&state->state_lock);
2963 nfs4_put_lock_state(prev);
2964 out:
2965 return ret;
2966 }
2967
2968 /**
2969 * nfs41_check_open_stateid - possibly free an open stateid
2970 *
2971 * @state: NFSv4 state for an inode
2972 *
2973 * Returns NFS_OK if recovery for this stateid is now finished.
2974 * Otherwise a negative NFS4ERR value is returned.
2975 */
nfs41_check_open_stateid(struct nfs4_state * state)2976 static int nfs41_check_open_stateid(struct nfs4_state *state)
2977 {
2978 struct nfs_server *server = NFS_SERVER(state->inode);
2979 nfs4_stateid *stateid = &state->open_stateid;
2980 const struct cred *cred = state->owner->so_cred;
2981 int status;
2982
2983 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2984 return -NFS4ERR_BAD_STATEID;
2985 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2986 trace_nfs4_test_open_stateid(state, NULL, status);
2987 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2988 nfs_state_clear_open_state_flags(state);
2989 stateid->type = NFS4_INVALID_STATEID_TYPE;
2990 return status;
2991 }
2992 if (nfs_open_stateid_recover_openmode(state))
2993 return -NFS4ERR_OPENMODE;
2994 return NFS_OK;
2995 }
2996
nfs41_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2997 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2998 {
2999 int status;
3000
3001 status = nfs41_check_delegation_stateid(state);
3002 if (status != NFS_OK)
3003 return status;
3004 nfs41_delegation_recover_stateid(state);
3005
3006 status = nfs41_check_expired_locks(state);
3007 if (status != NFS_OK)
3008 return status;
3009 status = nfs41_check_open_stateid(state);
3010 if (status != NFS_OK)
3011 status = nfs4_open_expired(sp, state);
3012 return status;
3013 }
3014
3015 /*
3016 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3017 * fields corresponding to attributes that were used to store the verifier.
3018 * Make sure we clobber those fields in the later setattr call
3019 */
nfs4_exclusive_attrset(struct nfs4_opendata * opendata,struct iattr * sattr,struct nfs4_label ** label)3020 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3021 struct iattr *sattr, struct nfs4_label **label)
3022 {
3023 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3024 __u32 attrset[3];
3025 unsigned ret;
3026 unsigned i;
3027
3028 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3029 attrset[i] = opendata->o_res.attrset[i];
3030 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3031 attrset[i] &= ~bitmask[i];
3032 }
3033
3034 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3035 sattr->ia_valid : 0;
3036
3037 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3038 if (sattr->ia_valid & ATTR_ATIME_SET)
3039 ret |= ATTR_ATIME_SET;
3040 else
3041 ret |= ATTR_ATIME;
3042 }
3043
3044 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3045 if (sattr->ia_valid & ATTR_MTIME_SET)
3046 ret |= ATTR_MTIME_SET;
3047 else
3048 ret |= ATTR_MTIME;
3049 }
3050
3051 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3052 *label = NULL;
3053 return ret;
3054 }
3055
_nfs4_open_and_get_state(struct nfs4_opendata * opendata,struct nfs_open_context * ctx)3056 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3057 struct nfs_open_context *ctx)
3058 {
3059 struct nfs4_state_owner *sp = opendata->owner;
3060 struct nfs_server *server = sp->so_server;
3061 struct dentry *dentry;
3062 struct nfs4_state *state;
3063 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3064 struct inode *dir = d_inode(opendata->dir);
3065 unsigned long dir_verifier;
3066 int ret;
3067
3068 dir_verifier = nfs_save_change_attribute(dir);
3069
3070 ret = _nfs4_proc_open(opendata, ctx);
3071 if (ret != 0)
3072 goto out;
3073
3074 state = _nfs4_opendata_to_nfs4_state(opendata);
3075 ret = PTR_ERR(state);
3076 if (IS_ERR(state))
3077 goto out;
3078 ctx->state = state;
3079 if (server->caps & NFS_CAP_POSIX_LOCK)
3080 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3081 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3082 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3083 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3084 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3085
3086 switch(opendata->o_arg.claim) {
3087 default:
3088 break;
3089 case NFS4_OPEN_CLAIM_NULL:
3090 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3091 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3092 if (!opendata->rpc_done)
3093 break;
3094 if (opendata->o_res.delegation.type != 0)
3095 dir_verifier = nfs_save_change_attribute(dir);
3096 }
3097
3098 dentry = opendata->dentry;
3099 nfs_set_verifier(dentry, dir_verifier);
3100 if (d_really_is_negative(dentry)) {
3101 struct dentry *alias;
3102 d_drop(dentry);
3103 alias = d_splice_alias(igrab(state->inode), dentry);
3104 /* d_splice_alias() can't fail here - it's a non-directory */
3105 if (alias) {
3106 dput(ctx->dentry);
3107 nfs_set_verifier(alias, dir_verifier);
3108 ctx->dentry = dentry = alias;
3109 }
3110 }
3111
3112 /* Parse layoutget results before we check for access */
3113 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3114
3115 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3116 if (ret != 0)
3117 goto out;
3118
3119 if (d_inode(dentry) == state->inode)
3120 nfs_inode_attach_open_context(ctx);
3121
3122 out:
3123 if (!opendata->cancelled) {
3124 if (opendata->lgp) {
3125 nfs4_lgopen_release(opendata->lgp);
3126 opendata->lgp = NULL;
3127 }
3128 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3129 }
3130 return ret;
3131 }
3132
3133 /*
3134 * Returns a referenced nfs4_state
3135 */
_nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,const struct nfs4_open_createattrs * c,int * opened)3136 static int _nfs4_do_open(struct inode *dir,
3137 struct nfs_open_context *ctx,
3138 int flags,
3139 const struct nfs4_open_createattrs *c,
3140 int *opened)
3141 {
3142 struct nfs4_state_owner *sp;
3143 struct nfs4_state *state = NULL;
3144 struct nfs_server *server = NFS_SERVER(dir);
3145 struct nfs4_opendata *opendata;
3146 struct dentry *dentry = ctx->dentry;
3147 const struct cred *cred = ctx->cred;
3148 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3149 fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3150 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3151 struct iattr *sattr = c->sattr;
3152 struct nfs4_label *label = c->label;
3153 int status;
3154
3155 /* Protect against reboot recovery conflicts */
3156 status = -ENOMEM;
3157 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3158 if (sp == NULL) {
3159 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3160 goto out_err;
3161 }
3162 status = nfs4_client_recover_expired_lease(server->nfs_client);
3163 if (status != 0)
3164 goto err_put_state_owner;
3165 if (d_really_is_positive(dentry))
3166 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3167 status = -ENOMEM;
3168 if (d_really_is_positive(dentry))
3169 claim = NFS4_OPEN_CLAIM_FH;
3170 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3171 c, claim, GFP_KERNEL);
3172 if (opendata == NULL)
3173 goto err_put_state_owner;
3174
3175 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3176 if (!opendata->f_attr.mdsthreshold) {
3177 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3178 if (!opendata->f_attr.mdsthreshold)
3179 goto err_opendata_put;
3180 }
3181 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3182 }
3183 if (d_really_is_positive(dentry))
3184 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3185
3186 status = _nfs4_open_and_get_state(opendata, ctx);
3187 if (status != 0)
3188 goto err_opendata_put;
3189 state = ctx->state;
3190
3191 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3192 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3193 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3194 /*
3195 * send create attributes which was not set by open
3196 * with an extra setattr.
3197 */
3198 if (attrs || label) {
3199 unsigned ia_old = sattr->ia_valid;
3200
3201 sattr->ia_valid = attrs;
3202 nfs_fattr_init(opendata->o_res.f_attr);
3203 status = nfs4_do_setattr(state->inode, cred,
3204 opendata->o_res.f_attr, sattr,
3205 ctx, label);
3206 if (status == 0) {
3207 nfs_setattr_update_inode(state->inode, sattr,
3208 opendata->o_res.f_attr);
3209 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3210 }
3211 sattr->ia_valid = ia_old;
3212 }
3213 }
3214 if (opened && opendata->file_created)
3215 *opened = 1;
3216
3217 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3218 *ctx_th = opendata->f_attr.mdsthreshold;
3219 opendata->f_attr.mdsthreshold = NULL;
3220 }
3221
3222 nfs4_opendata_put(opendata);
3223 nfs4_put_state_owner(sp);
3224 return 0;
3225 err_opendata_put:
3226 nfs4_opendata_put(opendata);
3227 err_put_state_owner:
3228 nfs4_put_state_owner(sp);
3229 out_err:
3230 return status;
3231 }
3232
3233
nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,struct iattr * sattr,struct nfs4_label * label,int * opened)3234 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3235 struct nfs_open_context *ctx,
3236 int flags,
3237 struct iattr *sattr,
3238 struct nfs4_label *label,
3239 int *opened)
3240 {
3241 struct nfs_server *server = NFS_SERVER(dir);
3242 struct nfs4_exception exception = {
3243 .interruptible = true,
3244 };
3245 struct nfs4_state *res;
3246 struct nfs4_open_createattrs c = {
3247 .label = label,
3248 .sattr = sattr,
3249 .verf = {
3250 [0] = (__u32)jiffies,
3251 [1] = (__u32)current->pid,
3252 },
3253 };
3254 int status;
3255
3256 do {
3257 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3258 res = ctx->state;
3259 trace_nfs4_open_file(ctx, flags, status);
3260 if (status == 0)
3261 break;
3262 /* NOTE: BAD_SEQID means the server and client disagree about the
3263 * book-keeping w.r.t. state-changing operations
3264 * (OPEN/CLOSE/LOCK/LOCKU...)
3265 * It is actually a sign of a bug on the client or on the server.
3266 *
3267 * If we receive a BAD_SEQID error in the particular case of
3268 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3269 * have unhashed the old state_owner for us, and that we can
3270 * therefore safely retry using a new one. We should still warn
3271 * the user though...
3272 */
3273 if (status == -NFS4ERR_BAD_SEQID) {
3274 pr_warn_ratelimited("NFS: v4 server %s "
3275 " returned a bad sequence-id error!\n",
3276 NFS_SERVER(dir)->nfs_client->cl_hostname);
3277 exception.retry = 1;
3278 continue;
3279 }
3280 /*
3281 * BAD_STATEID on OPEN means that the server cancelled our
3282 * state before it received the OPEN_CONFIRM.
3283 * Recover by retrying the request as per the discussion
3284 * on Page 181 of RFC3530.
3285 */
3286 if (status == -NFS4ERR_BAD_STATEID) {
3287 exception.retry = 1;
3288 continue;
3289 }
3290 if (status == -NFS4ERR_EXPIRED) {
3291 nfs4_schedule_lease_recovery(server->nfs_client);
3292 exception.retry = 1;
3293 continue;
3294 }
3295 if (status == -EAGAIN) {
3296 /* We must have found a delegation */
3297 exception.retry = 1;
3298 continue;
3299 }
3300 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3301 continue;
3302 res = ERR_PTR(nfs4_handle_exception(server,
3303 status, &exception));
3304 } while (exception.retry);
3305 return res;
3306 }
3307
_nfs4_do_setattr(struct inode * inode,struct nfs_setattrargs * arg,struct nfs_setattrres * res,const struct cred * cred,struct nfs_open_context * ctx)3308 static int _nfs4_do_setattr(struct inode *inode,
3309 struct nfs_setattrargs *arg,
3310 struct nfs_setattrres *res,
3311 const struct cred *cred,
3312 struct nfs_open_context *ctx)
3313 {
3314 struct nfs_server *server = NFS_SERVER(inode);
3315 struct rpc_message msg = {
3316 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3317 .rpc_argp = arg,
3318 .rpc_resp = res,
3319 .rpc_cred = cred,
3320 };
3321 const struct cred *delegation_cred = NULL;
3322 unsigned long timestamp = jiffies;
3323 bool truncate;
3324 int status;
3325
3326 nfs_fattr_init(res->fattr);
3327
3328 /* Servers should only apply open mode checks for file size changes */
3329 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3330 if (!truncate) {
3331 nfs4_inode_make_writeable(inode);
3332 goto zero_stateid;
3333 }
3334
3335 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3336 /* Use that stateid */
3337 } else if (ctx != NULL && ctx->state) {
3338 struct nfs_lock_context *l_ctx;
3339 if (!nfs4_valid_open_stateid(ctx->state))
3340 return -EBADF;
3341 l_ctx = nfs_get_lock_context(ctx);
3342 if (IS_ERR(l_ctx))
3343 return PTR_ERR(l_ctx);
3344 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3345 &arg->stateid, &delegation_cred);
3346 nfs_put_lock_context(l_ctx);
3347 if (status == -EIO)
3348 return -EBADF;
3349 else if (status == -EAGAIN)
3350 goto zero_stateid;
3351 } else {
3352 zero_stateid:
3353 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3354 }
3355 if (delegation_cred)
3356 msg.rpc_cred = delegation_cred;
3357
3358 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3359
3360 put_cred(delegation_cred);
3361 if (status == 0 && ctx != NULL)
3362 renew_lease(server, timestamp);
3363 trace_nfs4_setattr(inode, &arg->stateid, status);
3364 return status;
3365 }
3366
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)3367 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3368 struct nfs_fattr *fattr, struct iattr *sattr,
3369 struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3370 {
3371 struct nfs_server *server = NFS_SERVER(inode);
3372 __u32 bitmask[NFS4_BITMASK_SZ];
3373 struct nfs4_state *state = ctx ? ctx->state : NULL;
3374 struct nfs_setattrargs arg = {
3375 .fh = NFS_FH(inode),
3376 .iap = sattr,
3377 .server = server,
3378 .bitmask = bitmask,
3379 .label = ilabel,
3380 };
3381 struct nfs_setattrres res = {
3382 .fattr = fattr,
3383 .server = server,
3384 };
3385 struct nfs4_exception exception = {
3386 .state = state,
3387 .inode = inode,
3388 .stateid = &arg.stateid,
3389 };
3390 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE |
3391 NFS_INO_INVALID_CTIME;
3392 int err;
3393
3394 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3395 adjust_flags |= NFS_INO_INVALID_MODE;
3396 if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3397 adjust_flags |= NFS_INO_INVALID_OTHER;
3398 if (sattr->ia_valid & ATTR_ATIME)
3399 adjust_flags |= NFS_INO_INVALID_ATIME;
3400 if (sattr->ia_valid & ATTR_MTIME)
3401 adjust_flags |= NFS_INO_INVALID_MTIME;
3402
3403 do {
3404 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3405 inode, adjust_flags);
3406
3407 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3408 switch (err) {
3409 case -NFS4ERR_OPENMODE:
3410 if (!(sattr->ia_valid & ATTR_SIZE)) {
3411 pr_warn_once("NFSv4: server %s is incorrectly "
3412 "applying open mode checks to "
3413 "a SETATTR that is not "
3414 "changing file size.\n",
3415 server->nfs_client->cl_hostname);
3416 }
3417 if (state && !(state->state & FMODE_WRITE)) {
3418 err = -EBADF;
3419 if (sattr->ia_valid & ATTR_OPEN)
3420 err = -EACCES;
3421 goto out;
3422 }
3423 }
3424 err = nfs4_handle_exception(server, err, &exception);
3425 } while (exception.retry);
3426 out:
3427 return err;
3428 }
3429
3430 static bool
nfs4_wait_on_layoutreturn(struct inode * inode,struct rpc_task * task)3431 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3432 {
3433 if (inode == NULL || !nfs_have_layout(inode))
3434 return false;
3435
3436 return pnfs_wait_on_layoutreturn(inode, task);
3437 }
3438
3439 /*
3440 * Update the seqid of an open stateid
3441 */
nfs4_sync_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)3442 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3443 struct nfs4_state *state)
3444 {
3445 __be32 seqid_open;
3446 u32 dst_seqid;
3447 int seq;
3448
3449 for (;;) {
3450 if (!nfs4_valid_open_stateid(state))
3451 break;
3452 seq = read_seqbegin(&state->seqlock);
3453 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3454 nfs4_stateid_copy(dst, &state->open_stateid);
3455 if (read_seqretry(&state->seqlock, seq))
3456 continue;
3457 break;
3458 }
3459 seqid_open = state->open_stateid.seqid;
3460 if (read_seqretry(&state->seqlock, seq))
3461 continue;
3462
3463 dst_seqid = be32_to_cpu(dst->seqid);
3464 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3465 dst->seqid = seqid_open;
3466 break;
3467 }
3468 }
3469
3470 /*
3471 * Update the seqid of an open stateid after receiving
3472 * NFS4ERR_OLD_STATEID
3473 */
nfs4_refresh_open_old_stateid(nfs4_stateid * dst,struct nfs4_state * state)3474 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3475 struct nfs4_state *state)
3476 {
3477 __be32 seqid_open;
3478 u32 dst_seqid;
3479 bool ret;
3480 int seq, status = -EAGAIN;
3481 DEFINE_WAIT(wait);
3482
3483 for (;;) {
3484 ret = false;
3485 if (!nfs4_valid_open_stateid(state))
3486 break;
3487 seq = read_seqbegin(&state->seqlock);
3488 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3489 if (read_seqretry(&state->seqlock, seq))
3490 continue;
3491 break;
3492 }
3493
3494 write_seqlock(&state->seqlock);
3495 seqid_open = state->open_stateid.seqid;
3496
3497 dst_seqid = be32_to_cpu(dst->seqid);
3498
3499 /* Did another OPEN bump the state's seqid? try again: */
3500 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3501 dst->seqid = seqid_open;
3502 write_sequnlock(&state->seqlock);
3503 ret = true;
3504 break;
3505 }
3506
3507 /* server says we're behind but we haven't seen the update yet */
3508 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3509 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3510 write_sequnlock(&state->seqlock);
3511 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3512
3513 if (fatal_signal_pending(current) || nfs_current_task_exiting())
3514 status = -EINTR;
3515 else
3516 if (schedule_timeout(5*HZ) != 0)
3517 status = 0;
3518
3519 finish_wait(&state->waitq, &wait);
3520
3521 if (!status)
3522 continue;
3523 if (status == -EINTR)
3524 break;
3525
3526 /* we slept the whole 5 seconds, we must have lost a seqid */
3527 dst->seqid = cpu_to_be32(dst_seqid + 1);
3528 ret = true;
3529 break;
3530 }
3531
3532 return ret;
3533 }
3534
3535 struct nfs4_closedata {
3536 struct inode *inode;
3537 struct nfs4_state *state;
3538 struct nfs_closeargs arg;
3539 struct nfs_closeres res;
3540 struct {
3541 struct nfs4_layoutreturn_args arg;
3542 struct nfs4_layoutreturn_res res;
3543 struct nfs4_xdr_opaque_data ld_private;
3544 u32 roc_barrier;
3545 bool roc;
3546 } lr;
3547 struct nfs_fattr fattr;
3548 unsigned long timestamp;
3549 unsigned short retrans;
3550 };
3551
nfs4_free_closedata(void * data)3552 static void nfs4_free_closedata(void *data)
3553 {
3554 struct nfs4_closedata *calldata = data;
3555 struct nfs4_state_owner *sp = calldata->state->owner;
3556 struct super_block *sb = calldata->state->inode->i_sb;
3557
3558 if (calldata->lr.roc)
3559 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3560 calldata->res.lr_ret);
3561 nfs4_put_open_state(calldata->state);
3562 nfs_free_seqid(calldata->arg.seqid);
3563 nfs4_put_state_owner(sp);
3564 nfs_sb_deactive(sb);
3565 kfree(calldata);
3566 }
3567
nfs4_close_done(struct rpc_task * task,void * data)3568 static void nfs4_close_done(struct rpc_task *task, void *data)
3569 {
3570 struct nfs4_closedata *calldata = data;
3571 struct nfs4_state *state = calldata->state;
3572 struct nfs_server *server = NFS_SERVER(calldata->inode);
3573 nfs4_stateid *res_stateid = NULL;
3574 struct nfs4_exception exception = {
3575 .state = state,
3576 .inode = calldata->inode,
3577 .stateid = &calldata->arg.stateid,
3578 .retrans = calldata->retrans,
3579 };
3580
3581 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3582 return;
3583 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3584
3585 /* Handle Layoutreturn errors */
3586 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3587 &calldata->res.lr_ret) == -EAGAIN)
3588 goto out_restart;
3589
3590 /* hmm. we are done with the inode, and in the process of freeing
3591 * the state_owner. we keep this around to process errors
3592 */
3593 switch (task->tk_status) {
3594 case 0:
3595 res_stateid = &calldata->res.stateid;
3596 renew_lease(server, calldata->timestamp);
3597 break;
3598 case -NFS4ERR_ACCESS:
3599 if (calldata->arg.bitmask != NULL) {
3600 calldata->arg.bitmask = NULL;
3601 calldata->res.fattr = NULL;
3602 goto out_restart;
3603
3604 }
3605 break;
3606 case -NFS4ERR_OLD_STATEID:
3607 /* Did we race with OPEN? */
3608 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3609 state))
3610 goto out_restart;
3611 goto out_release;
3612 case -NFS4ERR_ADMIN_REVOKED:
3613 case -NFS4ERR_STALE_STATEID:
3614 case -NFS4ERR_EXPIRED:
3615 nfs4_free_revoked_stateid(server,
3616 &calldata->arg.stateid,
3617 task->tk_msg.rpc_cred);
3618 fallthrough;
3619 case -NFS4ERR_BAD_STATEID:
3620 if (calldata->arg.fmode == 0)
3621 break;
3622 fallthrough;
3623 default:
3624 task->tk_status = nfs4_async_handle_exception(task,
3625 server, task->tk_status, &exception);
3626 calldata->retrans = exception.retrans;
3627 if (exception.retry)
3628 goto out_restart;
3629 }
3630 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3631 res_stateid, calldata->arg.fmode);
3632 out_release:
3633 task->tk_status = 0;
3634 nfs_release_seqid(calldata->arg.seqid);
3635 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3636 dprintk("%s: ret = %d\n", __func__, task->tk_status);
3637 return;
3638 out_restart:
3639 task->tk_status = 0;
3640 rpc_restart_call_prepare(task);
3641 goto out_release;
3642 }
3643
nfs4_close_prepare(struct rpc_task * task,void * data)3644 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3645 {
3646 struct nfs4_closedata *calldata = data;
3647 struct nfs4_state *state = calldata->state;
3648 struct inode *inode = calldata->inode;
3649 struct nfs_server *server = NFS_SERVER(inode);
3650 struct pnfs_layout_hdr *lo;
3651 bool is_rdonly, is_wronly, is_rdwr;
3652 int call_close = 0;
3653
3654 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3655 goto out_wait;
3656
3657 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3658 spin_lock(&state->owner->so_lock);
3659 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3660 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3661 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3662 /* Calculate the change in open mode */
3663 calldata->arg.fmode = 0;
3664 if (state->n_rdwr == 0) {
3665 if (state->n_rdonly == 0)
3666 call_close |= is_rdonly;
3667 else if (is_rdonly)
3668 calldata->arg.fmode |= FMODE_READ;
3669 if (state->n_wronly == 0)
3670 call_close |= is_wronly;
3671 else if (is_wronly)
3672 calldata->arg.fmode |= FMODE_WRITE;
3673 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3674 call_close |= is_rdwr;
3675 } else if (is_rdwr)
3676 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3677
3678 nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3679 if (!nfs4_valid_open_stateid(state))
3680 call_close = 0;
3681 spin_unlock(&state->owner->so_lock);
3682
3683 if (!call_close) {
3684 /* Note: exit _without_ calling nfs4_close_done */
3685 goto out_no_action;
3686 }
3687
3688 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3689 nfs_release_seqid(calldata->arg.seqid);
3690 goto out_wait;
3691 }
3692
3693 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3694 if (lo && !pnfs_layout_is_valid(lo)) {
3695 calldata->arg.lr_args = NULL;
3696 calldata->res.lr_res = NULL;
3697 }
3698
3699 if (calldata->arg.fmode == 0)
3700 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3701
3702 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3703 /* Close-to-open cache consistency revalidation */
3704 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
3705 nfs4_bitmask_set(calldata->arg.bitmask_store,
3706 server->cache_consistency_bitmask,
3707 inode, 0);
3708 calldata->arg.bitmask = calldata->arg.bitmask_store;
3709 } else
3710 calldata->arg.bitmask = NULL;
3711 }
3712
3713 calldata->arg.share_access =
3714 nfs4_fmode_to_share_access(calldata->arg.fmode);
3715
3716 if (calldata->res.fattr == NULL)
3717 calldata->arg.bitmask = NULL;
3718 else if (calldata->arg.bitmask == NULL)
3719 calldata->res.fattr = NULL;
3720 calldata->timestamp = jiffies;
3721 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3722 &calldata->arg.seq_args,
3723 &calldata->res.seq_res,
3724 task) != 0)
3725 nfs_release_seqid(calldata->arg.seqid);
3726 return;
3727 out_no_action:
3728 task->tk_action = NULL;
3729 out_wait:
3730 nfs4_sequence_done(task, &calldata->res.seq_res);
3731 }
3732
3733 static const struct rpc_call_ops nfs4_close_ops = {
3734 .rpc_call_prepare = nfs4_close_prepare,
3735 .rpc_call_done = nfs4_close_done,
3736 .rpc_release = nfs4_free_closedata,
3737 };
3738
3739 /*
3740 * It is possible for data to be read/written from a mem-mapped file
3741 * after the sys_close call (which hits the vfs layer as a flush).
3742 * This means that we can't safely call nfsv4 close on a file until
3743 * the inode is cleared. This in turn means that we are not good
3744 * NFSv4 citizens - we do not indicate to the server to update the file's
3745 * share state even when we are done with one of the three share
3746 * stateid's in the inode.
3747 *
3748 * NOTE: Caller must be holding the sp->so_owner semaphore!
3749 */
nfs4_do_close(struct nfs4_state * state,gfp_t gfp_mask,int wait)3750 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3751 {
3752 struct nfs_server *server = NFS_SERVER(state->inode);
3753 struct nfs_client *clp = server->nfs_client;
3754 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3755 struct nfs4_closedata *calldata;
3756 struct nfs4_state_owner *sp = state->owner;
3757 struct rpc_task *task;
3758 struct rpc_message msg = {
3759 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3760 .rpc_cred = state->owner->so_cred,
3761 };
3762 struct rpc_task_setup task_setup_data = {
3763 .rpc_client = server->client,
3764 .rpc_message = &msg,
3765 .callback_ops = &nfs4_close_ops,
3766 .workqueue = nfsiod_workqueue,
3767 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3768 };
3769 int status = -ENOMEM;
3770
3771 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3772 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3773
3774 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_CLEANUP,
3775 &task_setup_data.rpc_client, &msg);
3776
3777 calldata = kzalloc_obj(*calldata, gfp_mask);
3778 if (calldata == NULL)
3779 goto out;
3780 nfs4_init_sequence(clp, &calldata->arg.seq_args,
3781 &calldata->res.seq_res, 1, 0);
3782 calldata->inode = state->inode;
3783 calldata->state = state;
3784 calldata->arg.fh = NFS_FH(state->inode);
3785 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3786 goto out_free_calldata;
3787 /* Serialization for the sequence id */
3788 alloc_seqid = clp->cl_mvops->alloc_seqid;
3789 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3790 if (IS_ERR(calldata->arg.seqid))
3791 goto out_free_calldata;
3792 nfs_fattr_init(&calldata->fattr);
3793 calldata->arg.fmode = 0;
3794 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3795 calldata->res.fattr = &calldata->fattr;
3796 calldata->res.seqid = calldata->arg.seqid;
3797 calldata->res.server = server;
3798 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3799 calldata->lr.roc = pnfs_roc(state->inode, &calldata->lr.arg,
3800 &calldata->lr.res, msg.rpc_cred, wait);
3801 if (calldata->lr.roc) {
3802 calldata->arg.lr_args = &calldata->lr.arg;
3803 calldata->res.lr_res = &calldata->lr.res;
3804 }
3805 nfs_sb_active(calldata->inode->i_sb);
3806
3807 msg.rpc_argp = &calldata->arg;
3808 msg.rpc_resp = &calldata->res;
3809 task_setup_data.callback_data = calldata;
3810 task = rpc_run_task(&task_setup_data);
3811 if (IS_ERR(task))
3812 return PTR_ERR(task);
3813 status = 0;
3814 if (wait)
3815 status = rpc_wait_for_completion_task(task);
3816 rpc_put_task(task);
3817 return status;
3818 out_free_calldata:
3819 kfree(calldata);
3820 out:
3821 nfs4_put_open_state(state);
3822 nfs4_put_state_owner(sp);
3823 return status;
3824 }
3825
3826 static struct inode *
nfs4_atomic_open(struct inode * dir,struct nfs_open_context * ctx,int open_flags,struct iattr * attr,int * opened)3827 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3828 int open_flags, struct iattr *attr, int *opened)
3829 {
3830 struct nfs4_state *state;
3831 struct nfs4_label l, *label;
3832
3833 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3834
3835 /* Protect against concurrent sillydeletes */
3836 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3837
3838 nfs4_label_release_security(label);
3839
3840 if (IS_ERR(state))
3841 return ERR_CAST(state);
3842 return state->inode;
3843 }
3844
nfs4_close_context(struct nfs_open_context * ctx,int is_sync)3845 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3846 {
3847 struct dentry *dentry = ctx->dentry;
3848 if (ctx->state == NULL)
3849 return;
3850 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
3851 nfs4_inode_set_return_delegation_on_close(d_inode(dentry));
3852 if (is_sync)
3853 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3854 else
3855 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3856 }
3857
3858 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3859 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3860 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_OPEN_ARGUMENTS - 1UL)
3861
3862 #define FATTR4_WORD2_NFS42_TIME_DELEG_MASK \
3863 (FATTR4_WORD2_TIME_DELEG_MODIFY|FATTR4_WORD2_TIME_DELEG_ACCESS)
nfs4_server_delegtime_capable(struct nfs4_server_caps_res * res)3864 static bool nfs4_server_delegtime_capable(struct nfs4_server_caps_res *res)
3865 {
3866 u32 share_access_want = res->open_caps.oa_share_access_want[0];
3867 u32 attr_bitmask = res->attr_bitmask[2];
3868
3869 return (share_access_want & NFS4_SHARE_WANT_DELEG_TIMESTAMPS) &&
3870 ((attr_bitmask & FATTR4_WORD2_NFS42_TIME_DELEG_MASK) ==
3871 FATTR4_WORD2_NFS42_TIME_DELEG_MASK);
3872 }
3873
_nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3874 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3875 {
3876 u32 minorversion = server->nfs_client->cl_minorversion;
3877 u32 bitmask[3] = {
3878 [0] = FATTR4_WORD0_SUPPORTED_ATTRS,
3879 };
3880 struct nfs4_server_caps_arg args = {
3881 .fhandle = fhandle,
3882 .bitmask = bitmask,
3883 };
3884 struct nfs4_server_caps_res res = {};
3885 struct rpc_message msg = {
3886 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3887 .rpc_argp = &args,
3888 .rpc_resp = &res,
3889 };
3890 int status;
3891 int i;
3892
3893 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3894 FATTR4_WORD0_FH_EXPIRE_TYPE |
3895 FATTR4_WORD0_LINK_SUPPORT |
3896 FATTR4_WORD0_SYMLINK_SUPPORT |
3897 FATTR4_WORD0_ACLSUPPORT |
3898 FATTR4_WORD0_CASE_INSENSITIVE |
3899 FATTR4_WORD0_CASE_PRESERVING;
3900 if (minorversion)
3901 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3902 if (minorversion > 1)
3903 bitmask[2] |= FATTR4_WORD2_OPEN_ARGUMENTS;
3904
3905 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3906 if (status == 0) {
3907 bitmask[0] = (FATTR4_WORD0_SUPPORTED_ATTRS |
3908 FATTR4_WORD0_FH_EXPIRE_TYPE |
3909 FATTR4_WORD0_LINK_SUPPORT |
3910 FATTR4_WORD0_SYMLINK_SUPPORT |
3911 FATTR4_WORD0_ACLSUPPORT |
3912 FATTR4_WORD0_CASE_INSENSITIVE |
3913 FATTR4_WORD0_CASE_PRESERVING) &
3914 res.attr_bitmask[0];
3915 /* Sanity check the server answers */
3916 switch (minorversion) {
3917 case 0:
3918 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3919 res.attr_bitmask[2] = 0;
3920 break;
3921 case 1:
3922 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3923 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT &
3924 res.attr_bitmask[2];
3925 break;
3926 case 2:
3927 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3928 bitmask[2] = (FATTR4_WORD2_SUPPATTR_EXCLCREAT |
3929 FATTR4_WORD2_OPEN_ARGUMENTS) &
3930 res.attr_bitmask[2];
3931 }
3932 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3933 server->caps &=
3934 ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS |
3935 NFS_CAP_SECURITY_LABEL | NFS_CAP_FS_LOCATIONS |
3936 NFS_CAP_OPEN_XOR | NFS_CAP_DELEGTIME |
3937 NFS_CAP_CASE_INSENSITIVE | NFS_CAP_CASE_NONPRESERVING);
3938 server->fattr_valid = NFS_ATTR_FATTR_V4;
3939 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3940 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3941 server->caps |= NFS_CAP_ACLS;
3942 if (res.has_links != 0)
3943 server->caps |= NFS_CAP_HARDLINKS;
3944 if (res.has_symlinks != 0)
3945 server->caps |= NFS_CAP_SYMLINKS;
3946 if (res.case_insensitive)
3947 server->caps |= NFS_CAP_CASE_INSENSITIVE;
3948 if ((res.attr_bitmask[0] & FATTR4_WORD0_CASE_PRESERVING) &&
3949 !res.case_preserving)
3950 server->caps |= NFS_CAP_CASE_NONPRESERVING;
3951 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3952 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3953 server->caps |= NFS_CAP_SECURITY_LABEL;
3954 #endif
3955 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3956 server->caps |= NFS_CAP_FS_LOCATIONS;
3957 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3958 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3959 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3960 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3961 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3962 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3963 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3964 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3965 NFS_ATTR_FATTR_OWNER_NAME);
3966 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3967 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3968 NFS_ATTR_FATTR_GROUP_NAME);
3969 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3970 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3971 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3972 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3973 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3974 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3975 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3976 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3977 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3978 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3979 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_CREATE))
3980 server->fattr_valid &= ~NFS_ATTR_FATTR_BTIME;
3981 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3982 sizeof(server->attr_bitmask));
3983 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3984
3985 if (res.open_caps.oa_share_access_want[0] &
3986 NFS4_SHARE_WANT_OPEN_XOR_DELEGATION)
3987 server->caps |= NFS_CAP_OPEN_XOR;
3988 if (nfs4_server_delegtime_capable(&res))
3989 server->caps |= NFS_CAP_DELEGTIME;
3990
3991 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3992 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3993 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3994 server->cache_consistency_bitmask[2] = 0;
3995
3996 /* Avoid a regression due to buggy server */
3997 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3998 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3999 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
4000 sizeof(server->exclcreat_bitmask));
4001
4002 server->acl_bitmask = res.acl_bitmask;
4003 server->fh_expire_type = res.fh_expire_type;
4004 }
4005
4006 return status;
4007 }
4008
nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)4009 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
4010 {
4011 struct nfs4_exception exception = {
4012 .interruptible = true,
4013 };
4014 int err;
4015
4016 do {
4017 err = nfs4_handle_exception(server,
4018 _nfs4_server_capabilities(server, fhandle),
4019 &exception);
4020 } while (exception.retry);
4021 return err;
4022 }
4023
test_fs_location_for_trunking(struct nfs4_fs_location * location,struct nfs_client * clp,struct nfs_server * server)4024 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
4025 struct nfs_client *clp,
4026 struct nfs_server *server)
4027 {
4028 int i;
4029
4030 for (i = 0; i < location->nservers; i++) {
4031 struct nfs4_string *srv_loc = &location->servers[i];
4032 struct sockaddr_storage addr;
4033 size_t addrlen;
4034 struct xprt_create xprt_args = {
4035 .ident = 0,
4036 .net = clp->cl_net,
4037 };
4038 struct nfs4_add_xprt_data xprtdata = {
4039 .clp = clp,
4040 };
4041 struct rpc_add_xprt_test rpcdata = {
4042 .add_xprt_test = clp->cl_mvops->session_trunk,
4043 .data = &xprtdata,
4044 };
4045 char *servername = NULL;
4046
4047 if (!srv_loc->len)
4048 continue;
4049
4050 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4051 &addr, sizeof(addr),
4052 clp->cl_net, server->port);
4053 if (!addrlen)
4054 return;
4055 xprt_args.dstaddr = (struct sockaddr *)&addr;
4056 xprt_args.addrlen = addrlen;
4057 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4058 if (!servername)
4059 return;
4060 memcpy(servername, srv_loc->data, srv_loc->len);
4061 servername[srv_loc->len] = '\0';
4062 xprt_args.servername = servername;
4063
4064 xprtdata.cred = nfs4_get_clid_cred(clp);
4065 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4066 rpc_clnt_setup_test_and_add_xprt,
4067 &rpcdata);
4068 if (xprtdata.cred)
4069 put_cred(xprtdata.cred);
4070 kfree(servername);
4071 }
4072 }
4073
_is_same_nfs4_pathname(struct nfs4_pathname * path1,struct nfs4_pathname * path2)4074 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1,
4075 struct nfs4_pathname *path2)
4076 {
4077 int i;
4078
4079 if (path1->ncomponents != path2->ncomponents)
4080 return false;
4081 for (i = 0; i < path1->ncomponents; i++) {
4082 if (path1->components[i].len != path2->components[i].len)
4083 return false;
4084 if (memcmp(path1->components[i].data, path2->components[i].data,
4085 path1->components[i].len))
4086 return false;
4087 }
4088 return true;
4089 }
4090
_nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4091 static int _nfs4_discover_trunking(struct nfs_server *server,
4092 struct nfs_fh *fhandle)
4093 {
4094 struct nfs4_fs_locations *locations = NULL;
4095 struct page *page;
4096 const struct cred *cred;
4097 struct nfs_client *clp = server->nfs_client;
4098 const struct nfs4_state_maintenance_ops *ops =
4099 clp->cl_mvops->state_renewal_ops;
4100 int status = -ENOMEM, i;
4101
4102 cred = ops->get_state_renewal_cred(clp);
4103 if (cred == NULL) {
4104 cred = nfs4_get_clid_cred(clp);
4105 if (cred == NULL)
4106 return -ENOKEY;
4107 }
4108
4109 page = alloc_page(GFP_KERNEL);
4110 if (!page)
4111 goto out_put_cred;
4112 locations = kmalloc_obj(struct nfs4_fs_locations);
4113 if (!locations)
4114 goto out_free;
4115 locations->fattr = nfs_alloc_fattr();
4116 if (!locations->fattr)
4117 goto out_free_2;
4118
4119 status = nfs4_proc_get_locations(server, fhandle, locations, page,
4120 cred);
4121 if (status)
4122 goto out_free_3;
4123
4124 for (i = 0; i < locations->nlocations; i++) {
4125 if (!_is_same_nfs4_pathname(&locations->fs_path,
4126 &locations->locations[i].rootpath))
4127 continue;
4128 test_fs_location_for_trunking(&locations->locations[i], clp,
4129 server);
4130 }
4131 out_free_3:
4132 kfree(locations->fattr);
4133 out_free_2:
4134 kfree(locations);
4135 out_free:
4136 __free_page(page);
4137 out_put_cred:
4138 put_cred(cred);
4139 return status;
4140 }
4141
nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4142 static int nfs4_discover_trunking(struct nfs_server *server,
4143 struct nfs_fh *fhandle)
4144 {
4145 struct nfs4_exception exception = {
4146 .interruptible = true,
4147 };
4148 struct nfs_client *clp = server->nfs_client;
4149 int err = 0;
4150
4151 if (!nfs4_has_session(clp))
4152 goto out;
4153 do {
4154 err = nfs4_handle_exception(server,
4155 _nfs4_discover_trunking(server, fhandle),
4156 &exception);
4157 } while (exception.retry);
4158 out:
4159 return err;
4160 }
4161
_nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4162 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4163 struct nfs_fattr *fattr)
4164 {
4165 u32 bitmask[3] = {
4166 [0] = FATTR4_WORD0_TYPE | FATTR4_WORD0_CHANGE |
4167 FATTR4_WORD0_SIZE | FATTR4_WORD0_FSID,
4168 };
4169 struct nfs4_lookup_root_arg args = {
4170 .bitmask = bitmask,
4171 };
4172 struct nfs4_lookup_res res = {
4173 .server = server,
4174 .fattr = fattr,
4175 .fh = fhandle,
4176 };
4177 struct rpc_message msg = {
4178 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4179 .rpc_argp = &args,
4180 .rpc_resp = &res,
4181 };
4182
4183 nfs_fattr_init(fattr);
4184 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4185 }
4186
nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4187 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4188 struct nfs_fattr *fattr)
4189 {
4190 struct nfs4_exception exception = {
4191 .interruptible = true,
4192 };
4193 int err;
4194 do {
4195 err = _nfs4_lookup_root(server, fhandle, fattr);
4196 trace_nfs4_lookup_root(server, fhandle, fattr, err);
4197 switch (err) {
4198 case 0:
4199 case -NFS4ERR_WRONGSEC:
4200 goto out;
4201 default:
4202 err = nfs4_handle_exception(server, err, &exception);
4203 }
4204 } while (exception.retry);
4205 out:
4206 return err;
4207 }
4208
nfs4_lookup_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,rpc_authflavor_t flavor)4209 static int nfs4_lookup_root_sec(struct nfs_server *server,
4210 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4211 rpc_authflavor_t flavor)
4212 {
4213 struct rpc_auth_create_args auth_args = {
4214 .pseudoflavor = flavor,
4215 };
4216 struct rpc_auth *auth;
4217
4218 auth = rpcauth_create(&auth_args, server->client);
4219 if (IS_ERR(auth))
4220 return -EACCES;
4221 return nfs4_lookup_root(server, fhandle, fattr);
4222 }
4223
4224 /*
4225 * Retry pseudoroot lookup with various security flavors. We do this when:
4226 *
4227 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4228 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4229 *
4230 * Returns zero on success, or a negative NFS4ERR value, or a
4231 * negative errno value.
4232 */
nfs4_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4233 int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4234 struct nfs_fattr *fattr)
4235 {
4236 /* Per 3530bis 15.33.5 */
4237 static const rpc_authflavor_t flav_array[] = {
4238 RPC_AUTH_GSS_KRB5P,
4239 RPC_AUTH_GSS_KRB5I,
4240 RPC_AUTH_GSS_KRB5,
4241 RPC_AUTH_UNIX, /* courtesy */
4242 RPC_AUTH_NULL,
4243 };
4244 int status = -EPERM;
4245 size_t i;
4246
4247 if (server->auth_info.flavor_len > 0) {
4248 /* try each flavor specified by user */
4249 for (i = 0; i < server->auth_info.flavor_len; i++) {
4250 status = nfs4_lookup_root_sec(
4251 server, fhandle, fattr,
4252 server->auth_info.flavors[i]);
4253 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4254 continue;
4255 break;
4256 }
4257 } else {
4258 /* no flavors specified by user, try default list */
4259 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4260 status = nfs4_lookup_root_sec(server, fhandle, fattr,
4261 flav_array[i]);
4262 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4263 continue;
4264 break;
4265 }
4266 }
4267
4268 /*
4269 * -EACCES could mean that the user doesn't have correct permissions
4270 * to access the mount. It could also mean that we tried to mount
4271 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
4272 * existing mount programs don't handle -EACCES very well so it should
4273 * be mapped to -EPERM instead.
4274 */
4275 if (status == -EACCES)
4276 status = -EPERM;
4277 return status;
4278 }
4279
4280 /**
4281 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4282 * @server: initialized nfs_server handle
4283 * @fhandle: we fill in the pseudo-fs root file handle
4284 * @fattr: we fill in a bare bones struct fattr
4285 * @auth_probe: probe the auth flavours
4286 *
4287 * Returns zero on success, or a negative errno.
4288 */
nfs4_proc_get_rootfh(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,bool auth_probe)4289 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4290 struct nfs_fattr *fattr, bool auth_probe)
4291 {
4292 int status = 0;
4293
4294 if (!auth_probe)
4295 status = nfs4_lookup_root(server, fhandle, fattr);
4296
4297 if (auth_probe || status == NFS4ERR_WRONGSEC)
4298 status = server->nfs_client->cl_mvops->find_root_sec(
4299 server, fhandle, fattr);
4300
4301 return nfs4_map_errors(status);
4302 }
4303
nfs4_proc_get_root(struct nfs_server * server,struct nfs_fh * mntfh,struct nfs_fsinfo * info)4304 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4305 struct nfs_fsinfo *info)
4306 {
4307 int error;
4308 struct nfs_fattr *fattr = info->fattr;
4309
4310 error = nfs4_server_capabilities(server, mntfh);
4311 if (error < 0) {
4312 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4313 return error;
4314 }
4315
4316 error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4317 if (error < 0) {
4318 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4319 goto out;
4320 }
4321
4322 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4323 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4324 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4325
4326 out:
4327 return error;
4328 }
4329
4330 /*
4331 * Get locations and (maybe) other attributes of a referral.
4332 * Note that we'll actually follow the referral later when
4333 * we detect fsid mismatch in inode revalidation
4334 */
nfs4_get_referral(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs_fattr * fattr,struct nfs_fh * fhandle)4335 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4336 const struct qstr *name, struct nfs_fattr *fattr,
4337 struct nfs_fh *fhandle)
4338 {
4339 int status = -ENOMEM;
4340 struct page *page = NULL;
4341 struct nfs4_fs_locations *locations = NULL;
4342
4343 page = alloc_page(GFP_KERNEL);
4344 if (page == NULL)
4345 goto out;
4346 locations = kmalloc_obj(struct nfs4_fs_locations);
4347 if (locations == NULL)
4348 goto out;
4349
4350 locations->fattr = fattr;
4351
4352 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4353 if (status != 0)
4354 goto out;
4355
4356 /*
4357 * If the fsid didn't change, this is a migration event, not a
4358 * referral. Cause us to drop into the exception handler, which
4359 * will kick off migration recovery.
4360 */
4361 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4362 dprintk("%s: server did not return a different fsid for"
4363 " a referral at %s\n", __func__, name->name);
4364 status = -NFS4ERR_MOVED;
4365 goto out;
4366 }
4367 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4368 nfs_fixup_referral_attributes(fattr);
4369 memset(fhandle, 0, sizeof(struct nfs_fh));
4370 out:
4371 if (page)
4372 __free_page(page);
4373 kfree(locations);
4374 return status;
4375 }
4376
should_request_dir_deleg(struct inode * inode)4377 static bool should_request_dir_deleg(struct inode *inode)
4378 {
4379 if (!directory_delegations)
4380 return false;
4381 if (!inode)
4382 return false;
4383 if (!S_ISDIR(inode->i_mode))
4384 return false;
4385 if (!nfs_server_capable(inode, NFS_CAP_DIR_DELEG))
4386 return false;
4387 if (!test_and_clear_bit(NFS_INO_REQ_DIR_DELEG, &(NFS_I(inode)->flags)))
4388 return false;
4389 if (nfs4_have_delegation(inode, FMODE_READ, 0))
4390 return false;
4391 return true;
4392 }
4393
nfs4_call_getattr_prepare(struct rpc_task * task,void * calldata)4394 static void nfs4_call_getattr_prepare(struct rpc_task *task, void *calldata)
4395 {
4396 struct nfs4_call_sync_data *data = calldata;
4397 nfs4_setup_sequence(data->seq_server->nfs_client, data->seq_args,
4398 data->seq_res, task);
4399 }
4400
nfs4_call_getattr_done(struct rpc_task * task,void * calldata)4401 static void nfs4_call_getattr_done(struct rpc_task *task, void *calldata)
4402 {
4403 struct nfs4_call_sync_data *data = calldata;
4404
4405 nfs4_sequence_process(task, data->seq_res);
4406 }
4407
4408 static const struct rpc_call_ops nfs4_call_getattr_ops = {
4409 .rpc_call_prepare = nfs4_call_getattr_prepare,
4410 .rpc_call_done = nfs4_call_getattr_done,
4411 };
4412
_nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4413 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4414 struct nfs_fattr *fattr, struct inode *inode)
4415 {
4416 __u32 bitmask[NFS4_BITMASK_SZ];
4417 struct nfs4_getattr_arg args = {
4418 .fh = fhandle,
4419 .bitmask = bitmask,
4420 };
4421 struct nfs4_getattr_res res = {
4422 .fattr = fattr,
4423 .server = server,
4424 };
4425 struct rpc_message msg = {
4426 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4427 .rpc_argp = &args,
4428 .rpc_resp = &res,
4429 };
4430 struct nfs4_call_sync_data data = {
4431 .seq_server = server,
4432 .seq_args = &args.seq_args,
4433 .seq_res = &res.seq_res,
4434 };
4435 struct rpc_task_setup task_setup = {
4436 .rpc_client = server->client,
4437 .rpc_message = &msg,
4438 .callback_ops = &nfs4_call_getattr_ops,
4439 .callback_data = &data,
4440 };
4441 struct nfs_client *clp = server->nfs_client;
4442 struct nfs4_gdd_res gdd_res;
4443 int status;
4444
4445 if (nfs4_has_session(clp))
4446 task_setup.flags = RPC_TASK_MOVEABLE;
4447
4448 /* Is this is an attribute revalidation, subject to softreval? */
4449 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4450 task_setup.flags |= RPC_TASK_TIMEOUT;
4451
4452 args.get_dir_deleg = should_request_dir_deleg(inode);
4453 if (args.get_dir_deleg)
4454 res.gdd_res = &gdd_res;
4455
4456 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4457 nfs_fattr_init(fattr);
4458 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 0);
4459
4460 status = nfs4_call_sync_custom(&task_setup);
4461
4462 if (args.get_dir_deleg) {
4463 switch (status) {
4464 case 0:
4465 if (gdd_res.status != GDD4_OK)
4466 break;
4467 nfs_inode_set_delegation(inode, current_cred(),
4468 FMODE_READ, &gdd_res.deleg, 0,
4469 NFS4_OPEN_DELEGATE_READ);
4470 break;
4471 case -ENOTSUPP:
4472 case -EOPNOTSUPP:
4473 server->caps &= ~NFS_CAP_DIR_DELEG;
4474 break;
4475 case -NFS4ERR_INVAL:
4476 case -NFS4ERR_IO:
4477 case -NFS4ERR_DIRDELEG_UNAVAIL:
4478 case -NFS4ERR_NOTDIR:
4479 clear_bit(NFS_INO_REQ_DIR_DELEG, &(NFS_I(inode)->flags));
4480 status = -EAGAIN;
4481 }
4482 }
4483
4484 nfs4_sequence_free_slot(&res.seq_res);
4485 return status;
4486 }
4487
nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4488 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4489 struct nfs_fattr *fattr, struct inode *inode)
4490 {
4491 struct nfs4_exception exception = {
4492 .interruptible = true,
4493 };
4494 int err;
4495 do {
4496 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4497 trace_nfs4_getattr(server, fhandle, fattr, err);
4498 switch (err) {
4499 default:
4500 err = nfs4_handle_exception(server, err, &exception);
4501 break;
4502 case -EAGAIN:
4503 case -ENOTSUPP:
4504 case -EOPNOTSUPP:
4505 exception.retry = true;
4506 }
4507 } while (exception.retry);
4508 return err;
4509 }
4510
4511 /*
4512 * The file is not closed if it is opened due to the a request to change
4513 * the size of the file. The open call will not be needed once the
4514 * VFS layer lookup-intents are implemented.
4515 *
4516 * Close is called when the inode is destroyed.
4517 * If we haven't opened the file for O_WRONLY, we
4518 * need to in the size_change case to obtain a stateid.
4519 *
4520 * Got race?
4521 * Because OPEN is always done by name in nfsv4, it is
4522 * possible that we opened a different file by the same
4523 * name. We can recognize this race condition, but we
4524 * can't do anything about it besides returning an error.
4525 *
4526 * This will be fixed with VFS changes (lookup-intent).
4527 */
4528 static int
nfs4_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)4529 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4530 struct iattr *sattr)
4531 {
4532 struct inode *inode = d_inode(dentry);
4533 const struct cred *cred = NULL;
4534 struct nfs_open_context *ctx = NULL;
4535 int status;
4536
4537 if (pnfs_ld_layoutret_on_setattr(inode) &&
4538 sattr->ia_valid & ATTR_SIZE &&
4539 sattr->ia_size < i_size_read(inode))
4540 pnfs_commit_and_return_layout(inode);
4541
4542 nfs_fattr_init(fattr);
4543
4544 /* Deal with open(O_TRUNC) */
4545 if (sattr->ia_valid & ATTR_OPEN)
4546 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4547
4548 /* Optimization: if the end result is no change, don't RPC */
4549 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4550 return 0;
4551
4552 /* Search for an existing open(O_WRITE) file */
4553 if (sattr->ia_valid & ATTR_FILE) {
4554
4555 ctx = nfs_file_open_context(sattr->ia_file);
4556 if (ctx)
4557 cred = ctx->cred;
4558 }
4559
4560 /* Return any delegations if we're going to change ACLs */
4561 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4562 nfs4_inode_make_writeable(inode);
4563
4564 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4565 if (status == 0) {
4566 nfs_setattr_update_inode(inode, sattr, fattr);
4567 nfs_setsecurity(inode, fattr);
4568 }
4569 return status;
4570 }
4571
_nfs4_proc_lookup(struct rpc_clnt * clnt,struct inode * dir,struct dentry * dentry,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4572 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4573 struct dentry *dentry, const struct qstr *name,
4574 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4575 {
4576 struct nfs_server *server = NFS_SERVER(dir);
4577 int status;
4578 struct nfs4_lookup_arg args = {
4579 .bitmask = server->attr_bitmask,
4580 .dir_fh = NFS_FH(dir),
4581 .name = name,
4582 };
4583 struct nfs4_lookup_res res = {
4584 .server = server,
4585 .fattr = fattr,
4586 .fh = fhandle,
4587 };
4588 struct rpc_message msg = {
4589 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4590 .rpc_argp = &args,
4591 .rpc_resp = &res,
4592 };
4593 unsigned short task_flags = 0;
4594
4595 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4596 task_flags = RPC_TASK_MOVEABLE;
4597
4598 /* Is this is an attribute revalidation, subject to softreval? */
4599 if (nfs_lookup_is_soft_revalidate(dentry))
4600 task_flags |= RPC_TASK_TIMEOUT;
4601
4602 args.bitmask = nfs4_bitmask(server, fattr->label);
4603
4604 nfs_fattr_init(fattr);
4605
4606 dprintk("NFS call lookup %pd2\n", dentry);
4607 nfs4_init_sequence(server->nfs_client, &args.seq_args, &res.seq_res, 0, 0);
4608 status = nfs4_do_call_sync(clnt, server, &msg,
4609 &args.seq_args, &res.seq_res, task_flags);
4610 dprintk("NFS reply lookup: %d\n", status);
4611 return status;
4612 }
4613
nfs_fixup_secinfo_attributes(struct nfs_fattr * fattr)4614 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4615 {
4616 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4617 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4618 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4619 fattr->nlink = 2;
4620 }
4621
nfs4_proc_lookup_common(struct rpc_clnt ** clnt,struct inode * dir,struct dentry * dentry,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4622 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4623 struct dentry *dentry, const struct qstr *name,
4624 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4625 {
4626 struct nfs4_exception exception = {
4627 .interruptible = true,
4628 };
4629 struct rpc_clnt *client = *clnt;
4630 int err;
4631 do {
4632 err = _nfs4_proc_lookup(client, dir, dentry, name, fhandle, fattr);
4633 trace_nfs4_lookup(dir, name, err);
4634 switch (err) {
4635 case -NFS4ERR_BADNAME:
4636 err = -ENOENT;
4637 goto out;
4638 case -NFS4ERR_MOVED:
4639 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4640 if (err == -NFS4ERR_MOVED)
4641 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4642 goto out;
4643 case -NFS4ERR_WRONGSEC:
4644 err = -EPERM;
4645 if (client != *clnt)
4646 goto out;
4647 client = nfs4_negotiate_security(client, dir, name);
4648 if (IS_ERR(client))
4649 return PTR_ERR(client);
4650
4651 exception.retry = 1;
4652 break;
4653 default:
4654 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4655 }
4656 } while (exception.retry);
4657
4658 out:
4659 if (err == 0)
4660 *clnt = client;
4661 else if (client != *clnt)
4662 rpc_shutdown_client(client);
4663
4664 return err;
4665 }
4666
nfs4_proc_lookup(struct inode * dir,struct dentry * dentry,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4667 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, const struct qstr *name,
4668 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4669 {
4670 int status;
4671 struct rpc_clnt *client = NFS_CLIENT(dir);
4672
4673 status = nfs4_proc_lookup_common(&client, dir, dentry, name, fhandle, fattr);
4674 if (client != NFS_CLIENT(dir)) {
4675 rpc_shutdown_client(client);
4676 nfs_fixup_secinfo_attributes(fattr);
4677 }
4678 return status;
4679 }
4680
4681 struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4682 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4683 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4684 {
4685 struct rpc_clnt *client = NFS_CLIENT(dir);
4686 int status;
4687
4688 status = nfs4_proc_lookup_common(&client, dir, dentry, &dentry->d_name,
4689 fhandle, fattr);
4690 if (status < 0)
4691 return ERR_PTR(status);
4692 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4693 }
4694
_nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4695 static int _nfs4_proc_lookupp(struct inode *inode,
4696 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4697 {
4698 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4699 struct nfs_server *server = NFS_SERVER(inode);
4700 int status;
4701 struct nfs4_lookupp_arg args = {
4702 .bitmask = server->attr_bitmask,
4703 .fh = NFS_FH(inode),
4704 };
4705 struct nfs4_lookupp_res res = {
4706 .server = server,
4707 .fattr = fattr,
4708 .fh = fhandle,
4709 };
4710 struct rpc_message msg = {
4711 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4712 .rpc_argp = &args,
4713 .rpc_resp = &res,
4714 };
4715 unsigned short task_flags = 0;
4716
4717 if (server->flags & NFS_MOUNT_SOFTREVAL)
4718 task_flags |= RPC_TASK_TIMEOUT;
4719 if (server->caps & NFS_CAP_MOVEABLE)
4720 task_flags |= RPC_TASK_MOVEABLE;
4721
4722 args.bitmask = nfs4_bitmask(server, fattr->label);
4723
4724 nfs_fattr_init(fattr);
4725 nfs4_init_sequence(server->nfs_client, &args.seq_args, &res.seq_res, 0, 0);
4726
4727 dprintk("NFS call lookupp ino=0x%llx\n", inode->i_ino);
4728 status = nfs4_do_call_sync(clnt, server, &msg, &args.seq_args,
4729 &res.seq_res, task_flags);
4730 dprintk("NFS reply lookupp: %d\n", status);
4731 return status;
4732 }
4733
nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4734 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4735 struct nfs_fattr *fattr)
4736 {
4737 struct nfs4_exception exception = {
4738 .interruptible = true,
4739 };
4740 int err;
4741 do {
4742 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4743 trace_nfs4_lookupp(inode, err);
4744 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4745 &exception);
4746 } while (exception.retry);
4747 return err;
4748 }
4749
_nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4750 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4751 const struct cred *cred)
4752 {
4753 struct nfs_server *server = NFS_SERVER(inode);
4754 struct nfs4_accessargs args = {
4755 .fh = NFS_FH(inode),
4756 .access = entry->mask,
4757 };
4758 struct nfs4_accessres res = {
4759 .server = server,
4760 };
4761 struct rpc_message msg = {
4762 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4763 .rpc_argp = &args,
4764 .rpc_resp = &res,
4765 .rpc_cred = cred,
4766 };
4767 int status = 0;
4768
4769 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
4770 nfs_request_directory_delegation(inode);
4771 res.fattr = nfs_alloc_fattr();
4772 if (res.fattr == NULL)
4773 return -ENOMEM;
4774 args.bitmask = server->cache_consistency_bitmask;
4775 }
4776 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4777 if (!status) {
4778 nfs_access_set_mask(entry, res.access);
4779 if (res.fattr)
4780 nfs_refresh_inode(inode, res.fattr);
4781 }
4782 nfs_free_fattr(res.fattr);
4783 return status;
4784 }
4785
nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4786 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4787 const struct cred *cred)
4788 {
4789 struct nfs4_exception exception = {
4790 .interruptible = true,
4791 };
4792 int err;
4793 do {
4794 err = _nfs4_proc_access(inode, entry, cred);
4795 trace_nfs4_access(inode, err);
4796 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4797 &exception);
4798 } while (exception.retry);
4799 return err;
4800 }
4801
4802 /*
4803 * TODO: For the time being, we don't try to get any attributes
4804 * along with any of the zero-copy operations READ, READDIR,
4805 * READLINK, WRITE.
4806 *
4807 * In the case of the first three, we want to put the GETATTR
4808 * after the read-type operation -- this is because it is hard
4809 * to predict the length of a GETATTR response in v4, and thus
4810 * align the READ data correctly. This means that the GETATTR
4811 * may end up partially falling into the page cache, and we should
4812 * shift it into the 'tail' of the xdr_buf before processing.
4813 * To do this efficiently, we need to know the total length
4814 * of data received, which doesn't seem to be available outside
4815 * of the RPC layer.
4816 *
4817 * In the case of WRITE, we also want to put the GETATTR after
4818 * the operation -- in this case because we want to make sure
4819 * we get the post-operation mtime and size.
4820 *
4821 * Both of these changes to the XDR layer would in fact be quite
4822 * minor, but I decided to leave them for a subsequent patch.
4823 */
_nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4824 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4825 unsigned int pgbase, unsigned int pglen)
4826 {
4827 struct nfs4_readlink args = {
4828 .fh = NFS_FH(inode),
4829 .pgbase = pgbase,
4830 .pglen = pglen,
4831 .pages = &page,
4832 };
4833 struct nfs4_readlink_res res;
4834 struct rpc_message msg = {
4835 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4836 .rpc_argp = &args,
4837 .rpc_resp = &res,
4838 };
4839
4840 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4841 }
4842
nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4843 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4844 unsigned int pgbase, unsigned int pglen)
4845 {
4846 struct nfs4_exception exception = {
4847 .interruptible = true,
4848 };
4849 int err;
4850 do {
4851 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4852 trace_nfs4_readlink(inode, err);
4853 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4854 &exception);
4855 } while (exception.retry);
4856 return err;
4857 }
4858
4859 /*
4860 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4861 */
4862 static int
nfs4_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)4863 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4864 int flags)
4865 {
4866 struct nfs_server *server = NFS_SERVER(dir);
4867 struct nfs4_label l, *ilabel;
4868 struct nfs_open_context *ctx;
4869 struct nfs4_state *state;
4870 int status = 0;
4871
4872 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4873 if (IS_ERR(ctx))
4874 return PTR_ERR(ctx);
4875
4876 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4877
4878 nfs_request_directory_delegation(dir);
4879
4880 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4881 sattr->ia_mode &= ~current_umask();
4882 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4883 if (IS_ERR(state)) {
4884 status = PTR_ERR(state);
4885 goto out;
4886 }
4887 out:
4888 nfs4_label_release_security(ilabel);
4889 put_nfs_open_context(ctx);
4890 return status;
4891 }
4892
4893 static int
_nfs4_proc_remove(struct inode * dir,const struct qstr * name,u32 ftype)4894 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4895 {
4896 struct nfs_server *server = NFS_SERVER(dir);
4897 struct nfs_removeargs args = {
4898 .fh = NFS_FH(dir),
4899 .name = *name,
4900 };
4901 struct nfs_removeres res = {
4902 .server = server,
4903 };
4904 struct rpc_message msg = {
4905 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4906 .rpc_argp = &args,
4907 .rpc_resp = &res,
4908 };
4909 unsigned long timestamp = jiffies;
4910 int status;
4911
4912 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4913 if (status == 0) {
4914 spin_lock(&dir->i_lock);
4915 /* Removing a directory decrements nlink in the parent */
4916 if (ftype == NF4DIR && dir->i_nlink > 2)
4917 nfs4_dec_nlink_locked(dir);
4918 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4919 NFS_INO_INVALID_DATA);
4920 spin_unlock(&dir->i_lock);
4921 }
4922 return status;
4923 }
4924
nfs4_proc_remove(struct inode * dir,struct dentry * dentry)4925 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4926 {
4927 struct nfs4_exception exception = {
4928 .interruptible = true,
4929 };
4930 struct inode *inode = d_inode(dentry);
4931 int err;
4932
4933 if (inode) {
4934 if (inode->i_nlink == 1)
4935 nfs4_inode_return_delegation(inode);
4936 else
4937 nfs4_inode_make_writeable(inode);
4938 }
4939 do {
4940 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4941 trace_nfs4_remove(dir, &dentry->d_name, err);
4942 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4943 &exception);
4944 } while (exception.retry);
4945 return err;
4946 }
4947
nfs4_proc_rmdir(struct inode * dir,const struct qstr * name)4948 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4949 {
4950 struct nfs4_exception exception = {
4951 .interruptible = true,
4952 };
4953 int err;
4954
4955 do {
4956 err = _nfs4_proc_remove(dir, name, NF4DIR);
4957 trace_nfs4_remove(dir, name, err);
4958 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4959 &exception);
4960 } while (exception.retry);
4961 return err;
4962 }
4963
nfs4_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)4964 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4965 struct dentry *dentry,
4966 struct inode *inode)
4967 {
4968 struct nfs_removeargs *args = msg->rpc_argp;
4969 struct nfs_removeres *res = msg->rpc_resp;
4970 struct nfs_server *server = NFS_SB(dentry->d_sb);
4971
4972 res->server = server;
4973 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4974 nfs4_init_sequence(server->nfs_client, &args->seq_args,
4975 &res->seq_res, 1, 0);
4976
4977 nfs_fattr_init(res->dir_attr);
4978 nfs_request_directory_delegation(d_inode(dentry->d_parent));
4979
4980 if (inode) {
4981 nfs4_inode_return_delegation(inode);
4982 nfs_d_prune_case_insensitive_aliases(inode);
4983 }
4984 }
4985
nfs4_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)4986 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4987 {
4988 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4989 &data->args.seq_args,
4990 &data->res.seq_res,
4991 task);
4992 }
4993
nfs4_proc_unlink_done(struct rpc_task * task,struct inode * dir)4994 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4995 {
4996 struct nfs_unlinkdata *data = task->tk_calldata;
4997 struct nfs_removeres *res = &data->res;
4998
4999 if (!nfs4_sequence_done(task, &res->seq_res))
5000 return 0;
5001 if (nfs4_async_handle_error(task, res->server, NULL,
5002 &data->timeout) == -EAGAIN)
5003 return 0;
5004 if (task->tk_status == 0)
5005 nfs4_update_changeattr(dir, &res->cinfo,
5006 res->dir_attr->time_start,
5007 NFS_INO_INVALID_DATA);
5008 return 1;
5009 }
5010
nfs4_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry,struct inode * same_parent)5011 static void nfs4_proc_rename_setup(struct rpc_message *msg,
5012 struct dentry *old_dentry,
5013 struct dentry *new_dentry,
5014 struct inode *same_parent)
5015 {
5016 struct nfs_server *server = NFS_SB(old_dentry->d_sb);
5017 struct nfs_renameargs *arg = msg->rpc_argp;
5018 struct nfs_renameres *res = msg->rpc_resp;
5019 struct inode *old_inode = d_inode(old_dentry);
5020 struct inode *new_inode = d_inode(new_dentry);
5021
5022 if (old_inode)
5023 nfs4_inode_make_writeable(old_inode);
5024 if (new_inode)
5025 nfs4_inode_return_delegation(new_inode);
5026 if (same_parent)
5027 nfs_request_directory_delegation(same_parent);
5028 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
5029 res->server = server;
5030 nfs4_init_sequence(server->nfs_client, &arg->seq_args,
5031 &res->seq_res, 1, 0);
5032 }
5033
nfs4_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)5034 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
5035 {
5036 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
5037 &data->args.seq_args,
5038 &data->res.seq_res,
5039 task);
5040 }
5041
nfs4_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)5042 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
5043 struct inode *new_dir)
5044 {
5045 struct nfs_renamedata *data = task->tk_calldata;
5046 struct nfs_renameres *res = &data->res;
5047
5048 if (!nfs4_sequence_done(task, &res->seq_res))
5049 return 0;
5050 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
5051 return 0;
5052
5053 if (task->tk_status == 0) {
5054 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
5055 if (new_dir != old_dir) {
5056 /* Note: If we moved a directory, nlink will change */
5057 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5058 res->old_fattr->time_start,
5059 NFS_INO_INVALID_NLINK |
5060 NFS_INO_INVALID_DATA);
5061 nfs4_update_changeattr(new_dir, &res->new_cinfo,
5062 res->new_fattr->time_start,
5063 NFS_INO_INVALID_NLINK |
5064 NFS_INO_INVALID_DATA);
5065 nfs_update_delegated_mtime(new_dir);
5066 } else
5067 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5068 res->old_fattr->time_start,
5069 NFS_INO_INVALID_DATA);
5070 }
5071 return 1;
5072 }
5073
_nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5074 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5075 {
5076 struct nfs_server *server = NFS_SERVER(inode);
5077 __u32 bitmask[NFS4_BITMASK_SZ];
5078 struct nfs4_link_arg arg = {
5079 .fh = NFS_FH(inode),
5080 .dir_fh = NFS_FH(dir),
5081 .name = name,
5082 .bitmask = bitmask,
5083 };
5084 struct nfs4_link_res res = {
5085 .server = server,
5086 };
5087 struct rpc_message msg = {
5088 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
5089 .rpc_argp = &arg,
5090 .rpc_resp = &res,
5091 };
5092 int status = -ENOMEM;
5093
5094 res.fattr = nfs_alloc_fattr_with_label(server);
5095 if (res.fattr == NULL)
5096 goto out;
5097
5098 nfs4_inode_make_writeable(inode);
5099 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label),
5100 inode,
5101 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME);
5102 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5103 if (!status) {
5104 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
5105 NFS_INO_INVALID_DATA);
5106 nfs4_inc_nlink(inode);
5107 status = nfs_post_op_update_inode(inode, res.fattr);
5108 if (!status)
5109 nfs_setsecurity(inode, res.fattr);
5110 }
5111
5112 out:
5113 nfs_free_fattr(res.fattr);
5114 return status;
5115 }
5116
nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5117 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5118 {
5119 struct nfs4_exception exception = {
5120 .interruptible = true,
5121 };
5122 int err;
5123 do {
5124 err = nfs4_handle_exception(NFS_SERVER(inode),
5125 _nfs4_proc_link(inode, dir, name),
5126 &exception);
5127 } while (exception.retry);
5128 return err;
5129 }
5130
5131 struct nfs4_createdata {
5132 struct rpc_message msg;
5133 struct nfs4_create_arg arg;
5134 struct nfs4_create_res res;
5135 struct nfs_fh fh;
5136 struct nfs_fattr fattr;
5137 };
5138
nfs4_alloc_createdata(struct inode * dir,const struct qstr * name,struct iattr * sattr,u32 ftype)5139 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
5140 const struct qstr *name, struct iattr *sattr, u32 ftype)
5141 {
5142 struct nfs4_createdata *data;
5143
5144 data = kzalloc_obj(*data);
5145 if (data != NULL) {
5146 struct nfs_server *server = NFS_SERVER(dir);
5147
5148 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
5149 if (IS_ERR(data->fattr.label))
5150 goto out_free;
5151
5152 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
5153 data->msg.rpc_argp = &data->arg;
5154 data->msg.rpc_resp = &data->res;
5155 data->arg.dir_fh = NFS_FH(dir);
5156 data->arg.server = server;
5157 data->arg.name = name;
5158 data->arg.attrs = sattr;
5159 data->arg.ftype = ftype;
5160 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
5161 data->arg.umask = current_umask();
5162 data->res.server = server;
5163 data->res.fh = &data->fh;
5164 data->res.fattr = &data->fattr;
5165 nfs_fattr_init(data->res.fattr);
5166 }
5167 return data;
5168 out_free:
5169 kfree(data);
5170 return NULL;
5171 }
5172
nfs4_do_create(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data)5173 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5174 {
5175 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5176 &data->arg.seq_args, &data->res.seq_res, 1);
5177 if (status == 0) {
5178 spin_lock(&dir->i_lock);
5179 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5180 data->res.fattr->time_start,
5181 NFS_INO_INVALID_DATA);
5182 spin_unlock(&dir->i_lock);
5183 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5184 }
5185 return status;
5186 }
5187
nfs4_do_mkdir(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data,int * statusp)5188 static struct dentry *nfs4_do_mkdir(struct inode *dir, struct dentry *dentry,
5189 struct nfs4_createdata *data, int *statusp)
5190 {
5191 struct dentry *ret;
5192
5193 *statusp = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5194 &data->arg.seq_args, &data->res.seq_res, 1);
5195
5196 if (*statusp)
5197 return NULL;
5198
5199 spin_lock(&dir->i_lock);
5200 /* Creating a directory bumps nlink in the parent */
5201 nfs4_inc_nlink_locked(dir);
5202 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5203 data->res.fattr->time_start,
5204 NFS_INO_INVALID_DATA);
5205 spin_unlock(&dir->i_lock);
5206 ret = nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
5207 if (!IS_ERR(ret))
5208 return ret;
5209 *statusp = PTR_ERR(ret);
5210 return NULL;
5211 }
5212
nfs4_free_createdata(struct nfs4_createdata * data)5213 static void nfs4_free_createdata(struct nfs4_createdata *data)
5214 {
5215 nfs4_label_free(data->fattr.label);
5216 kfree(data);
5217 }
5218
_nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr,struct nfs4_label * label)5219 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5220 struct folio *folio, unsigned int len, struct iattr *sattr,
5221 struct nfs4_label *label)
5222 {
5223 struct page *page = &folio->page;
5224 struct nfs4_createdata *data;
5225 int status = -ENAMETOOLONG;
5226
5227 if (len > NFS4_MAXPATHLEN)
5228 goto out;
5229
5230 status = -ENOMEM;
5231 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5232 if (data == NULL)
5233 goto out;
5234
5235 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5236 data->arg.u.symlink.pages = &page;
5237 data->arg.u.symlink.len = len;
5238 data->arg.label = label;
5239
5240 status = nfs4_do_create(dir, dentry, data);
5241
5242 nfs4_free_createdata(data);
5243 out:
5244 return status;
5245 }
5246
nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)5247 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5248 struct folio *folio, unsigned int len, struct iattr *sattr)
5249 {
5250 struct nfs4_exception exception = {
5251 .interruptible = true,
5252 };
5253 struct nfs4_label l, *label;
5254 int err;
5255
5256 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5257
5258 do {
5259 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
5260 trace_nfs4_symlink(dir, &dentry->d_name, err);
5261 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5262 &exception);
5263 } while (exception.retry);
5264
5265 nfs4_label_release_security(label);
5266 return err;
5267 }
5268
_nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,int * statusp)5269 static struct dentry *_nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5270 struct iattr *sattr,
5271 struct nfs4_label *label, int *statusp)
5272 {
5273 struct nfs4_createdata *data;
5274 struct dentry *ret = NULL;
5275
5276 *statusp = -ENOMEM;
5277 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5278 if (data == NULL)
5279 goto out;
5280
5281 data->arg.label = label;
5282 ret = nfs4_do_mkdir(dir, dentry, data, statusp);
5283
5284 nfs4_free_createdata(data);
5285 out:
5286 return ret;
5287 }
5288
nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)5289 static struct dentry *nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5290 struct iattr *sattr)
5291 {
5292 struct nfs_server *server = NFS_SERVER(dir);
5293 struct nfs4_exception exception = {
5294 .interruptible = true,
5295 };
5296 struct nfs4_label l, *label;
5297 struct dentry *alias;
5298 int err;
5299
5300 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5301
5302 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5303 sattr->ia_mode &= ~current_umask();
5304 do {
5305 alias = _nfs4_proc_mkdir(dir, dentry, sattr, label, &err);
5306 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5307 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
5308 if (err)
5309 alias = ERR_PTR(err);
5310 } while (exception.retry);
5311 nfs4_label_release_security(label);
5312
5313 return alias;
5314 }
5315
_nfs4_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)5316 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5317 struct nfs_readdir_res *nr_res)
5318 {
5319 struct inode *dir = d_inode(nr_arg->dentry);
5320 struct nfs_server *server = NFS_SERVER(dir);
5321 struct nfs4_readdir_arg args = {
5322 .fh = NFS_FH(dir),
5323 .pages = nr_arg->pages,
5324 .pgbase = 0,
5325 .count = nr_arg->page_len,
5326 .plus = nr_arg->plus,
5327 };
5328 struct nfs4_readdir_res res;
5329 struct rpc_message msg = {
5330 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5331 .rpc_argp = &args,
5332 .rpc_resp = &res,
5333 .rpc_cred = nr_arg->cred,
5334 };
5335 int status;
5336
5337 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5338 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5339 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5340 args.bitmask = server->attr_bitmask_nl;
5341 else
5342 args.bitmask = server->attr_bitmask;
5343
5344 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5345 res.pgbase = args.pgbase;
5346 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5347 &res.seq_res, 0);
5348 if (status >= 0) {
5349 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5350 status += args.pgbase;
5351 }
5352
5353 nfs_invalidate_atime(dir);
5354
5355 dprintk("%s: returns %d\n", __func__, status);
5356 return status;
5357 }
5358
nfs4_proc_readdir(struct nfs_readdir_arg * arg,struct nfs_readdir_res * res)5359 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5360 struct nfs_readdir_res *res)
5361 {
5362 struct nfs4_exception exception = {
5363 .interruptible = true,
5364 };
5365 int err;
5366 do {
5367 err = _nfs4_proc_readdir(arg, res);
5368 trace_nfs4_readdir(d_inode(arg->dentry), err);
5369 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5370 err, &exception);
5371 } while (exception.retry);
5372 return err;
5373 }
5374
_nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,dev_t rdev)5375 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5376 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5377 {
5378 struct nfs4_createdata *data;
5379 int mode = sattr->ia_mode;
5380 int status = -ENOMEM;
5381
5382 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5383 if (data == NULL)
5384 goto out;
5385
5386 if (S_ISFIFO(mode))
5387 data->arg.ftype = NF4FIFO;
5388 else if (S_ISBLK(mode)) {
5389 data->arg.ftype = NF4BLK;
5390 data->arg.u.device.specdata1 = MAJOR(rdev);
5391 data->arg.u.device.specdata2 = MINOR(rdev);
5392 }
5393 else if (S_ISCHR(mode)) {
5394 data->arg.ftype = NF4CHR;
5395 data->arg.u.device.specdata1 = MAJOR(rdev);
5396 data->arg.u.device.specdata2 = MINOR(rdev);
5397 } else if (!S_ISSOCK(mode)) {
5398 status = -EINVAL;
5399 goto out_free;
5400 }
5401
5402 data->arg.label = label;
5403 status = nfs4_do_create(dir, dentry, data);
5404 out_free:
5405 nfs4_free_createdata(data);
5406 out:
5407 return status;
5408 }
5409
nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)5410 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5411 struct iattr *sattr, dev_t rdev)
5412 {
5413 struct nfs_server *server = NFS_SERVER(dir);
5414 struct nfs4_exception exception = {
5415 .interruptible = true,
5416 };
5417 struct nfs4_label l, *label;
5418 int err;
5419
5420 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5421
5422 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5423 sattr->ia_mode &= ~current_umask();
5424 do {
5425 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5426 trace_nfs4_mknod(dir, &dentry->d_name, err);
5427 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5428 &exception);
5429 } while (exception.retry);
5430
5431 nfs4_label_release_security(label);
5432
5433 return err;
5434 }
5435
_nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5436 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5437 struct nfs_fsstat *fsstat)
5438 {
5439 struct nfs4_statfs_arg args = {
5440 .fh = fhandle,
5441 .bitmask = server->attr_bitmask,
5442 };
5443 struct nfs4_statfs_res res = {
5444 .fsstat = fsstat,
5445 };
5446 struct rpc_message msg = {
5447 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5448 .rpc_argp = &args,
5449 .rpc_resp = &res,
5450 };
5451
5452 nfs_fattr_init(fsstat->fattr);
5453 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5454 }
5455
nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5456 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5457 {
5458 struct nfs4_exception exception = {
5459 .interruptible = true,
5460 };
5461 int err;
5462 do {
5463 err = nfs4_handle_exception(server,
5464 _nfs4_proc_statfs(server, fhandle, fsstat),
5465 &exception);
5466 } while (exception.retry);
5467 return err;
5468 }
5469
_nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5470 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5471 struct nfs_fsinfo *fsinfo)
5472 {
5473 struct nfs4_fsinfo_arg args = {
5474 .fh = fhandle,
5475 .bitmask = server->attr_bitmask,
5476 };
5477 struct nfs4_fsinfo_res res = {
5478 .fsinfo = fsinfo,
5479 };
5480 struct rpc_message msg = {
5481 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5482 .rpc_argp = &args,
5483 .rpc_resp = &res,
5484 };
5485
5486 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5487 }
5488
nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5489 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5490 {
5491 struct nfs4_exception exception = {
5492 .interruptible = true,
5493 };
5494 int err;
5495
5496 do {
5497 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5498 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5499 if (err == 0) {
5500 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time);
5501 break;
5502 }
5503 err = nfs4_handle_exception(server, err, &exception);
5504 } while (exception.retry);
5505 return err;
5506 }
5507
nfs4_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5508 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5509 {
5510 int error;
5511
5512 nfs_fattr_init(fsinfo->fattr);
5513 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5514 if (error == 0) {
5515 /* block layout checks this! */
5516 server->pnfs_blksize = fsinfo->blksize;
5517 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5518 }
5519
5520 return error;
5521 }
5522
_nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5523 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5524 struct nfs_pathconf *pathconf)
5525 {
5526 struct nfs4_pathconf_arg args = {
5527 .fh = fhandle,
5528 .bitmask = server->attr_bitmask,
5529 };
5530 struct nfs4_pathconf_res res = {
5531 .pathconf = pathconf,
5532 };
5533 struct rpc_message msg = {
5534 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5535 .rpc_argp = &args,
5536 .rpc_resp = &res,
5537 };
5538
5539 /* None of the pathconf attributes are mandatory to implement */
5540 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5541 memset(pathconf, 0, sizeof(*pathconf));
5542 return 0;
5543 }
5544
5545 nfs_fattr_init(pathconf->fattr);
5546 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5547 }
5548
nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5549 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5550 struct nfs_pathconf *pathconf)
5551 {
5552 struct nfs4_exception exception = {
5553 .interruptible = true,
5554 };
5555 int err;
5556
5557 do {
5558 err = nfs4_handle_exception(server,
5559 _nfs4_proc_pathconf(server, fhandle, pathconf),
5560 &exception);
5561 } while (exception.retry);
5562 return err;
5563 }
5564
nfs4_set_rw_stateid(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5565 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5566 const struct nfs_open_context *ctx,
5567 const struct nfs_lock_context *l_ctx,
5568 fmode_t fmode)
5569 {
5570 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5571 }
5572 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5573
nfs4_stateid_is_current(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5574 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5575 const struct nfs_open_context *ctx,
5576 const struct nfs_lock_context *l_ctx,
5577 fmode_t fmode)
5578 {
5579 nfs4_stateid _current_stateid;
5580
5581 /* If the current stateid represents a lost lock, then exit */
5582 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5583 return true;
5584 return nfs4_stateid_match(stateid, &_current_stateid);
5585 }
5586
nfs4_error_stateid_expired(int err)5587 static bool nfs4_error_stateid_expired(int err)
5588 {
5589 switch (err) {
5590 case -NFS4ERR_DELEG_REVOKED:
5591 case -NFS4ERR_ADMIN_REVOKED:
5592 case -NFS4ERR_BAD_STATEID:
5593 case -NFS4ERR_STALE_STATEID:
5594 case -NFS4ERR_OLD_STATEID:
5595 case -NFS4ERR_OPENMODE:
5596 case -NFS4ERR_EXPIRED:
5597 return true;
5598 }
5599 return false;
5600 }
5601
nfs4_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5602 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5603 {
5604 struct nfs_server *server = NFS_SERVER(hdr->inode);
5605
5606 trace_nfs4_read(hdr, task->tk_status);
5607 if (task->tk_status < 0) {
5608 struct nfs4_exception exception = {
5609 .inode = hdr->inode,
5610 .state = hdr->args.context->state,
5611 .stateid = &hdr->args.stateid,
5612 .retrans = hdr->retrans,
5613 };
5614 task->tk_status = nfs4_async_handle_exception(task,
5615 server, task->tk_status, &exception);
5616 hdr->retrans = exception.retrans;
5617 if (exception.retry) {
5618 rpc_restart_call_prepare(task);
5619 return -EAGAIN;
5620 }
5621 }
5622
5623 if (task->tk_status > 0)
5624 renew_lease(server, hdr->timestamp);
5625 return 0;
5626 }
5627
nfs4_read_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5628 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5629 struct nfs_pgio_args *args)
5630 {
5631
5632 if (!nfs4_error_stateid_expired(task->tk_status) ||
5633 nfs4_stateid_is_current(&args->stateid,
5634 args->context,
5635 args->lock_context,
5636 FMODE_READ))
5637 return false;
5638 rpc_restart_call_prepare(task);
5639 return true;
5640 }
5641
nfs4_read_plus_not_supported(struct rpc_task * task,struct nfs_pgio_header * hdr)5642 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5643 struct nfs_pgio_header *hdr)
5644 {
5645 struct nfs_server *server = NFS_SERVER(hdr->inode);
5646 struct rpc_message *msg = &task->tk_msg;
5647
5648 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5649 task->tk_status == -ENOTSUPP) {
5650 server->caps &= ~NFS_CAP_READ_PLUS;
5651 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5652 rpc_restart_call_prepare(task);
5653 return true;
5654 }
5655 return false;
5656 }
5657
nfs4_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5658 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5659 {
5660 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5661 return -EAGAIN;
5662 if (nfs4_read_stateid_changed(task, &hdr->args))
5663 return -EAGAIN;
5664 if (nfs4_read_plus_not_supported(task, hdr))
5665 return -EAGAIN;
5666 if (task->tk_status > 0)
5667 nfs_invalidate_atime(hdr->inode);
5668 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5669 nfs4_read_done_cb(task, hdr);
5670 }
5671
5672 #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)5673 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5674 struct rpc_message *msg)
5675 {
5676 /* Note: We don't use READ_PLUS with pNFS yet */
5677 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5678 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5679 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5680 }
5681 return false;
5682 }
5683 #else
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5684 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5685 struct rpc_message *msg)
5686 {
5687 return false;
5688 }
5689 #endif /* CONFIG_NFS_V4_2 */
5690
nfs4_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)5691 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5692 struct rpc_message *msg)
5693 {
5694 hdr->timestamp = jiffies;
5695 if (!hdr->pgio_done_cb)
5696 hdr->pgio_done_cb = nfs4_read_done_cb;
5697 if (!nfs42_read_plus_support(hdr, msg))
5698 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5699 nfs4_init_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5700 &hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5701 }
5702
nfs4_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)5703 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5704 struct nfs_pgio_header *hdr)
5705 {
5706 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5707 &hdr->args.seq_args,
5708 &hdr->res.seq_res,
5709 task))
5710 return 0;
5711 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5712 hdr->args.lock_context,
5713 hdr->rw_mode) == -EIO)
5714 return -EIO;
5715 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5716 return -EIO;
5717 return 0;
5718 }
5719
nfs4_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5720 static int nfs4_write_done_cb(struct rpc_task *task,
5721 struct nfs_pgio_header *hdr)
5722 {
5723 struct inode *inode = hdr->inode;
5724
5725 trace_nfs4_write(hdr, task->tk_status);
5726 if (task->tk_status < 0) {
5727 struct nfs4_exception exception = {
5728 .inode = hdr->inode,
5729 .state = hdr->args.context->state,
5730 .stateid = &hdr->args.stateid,
5731 .retrans = hdr->retrans,
5732 };
5733 task->tk_status = nfs4_async_handle_exception(task,
5734 NFS_SERVER(inode), task->tk_status,
5735 &exception);
5736 hdr->retrans = exception.retrans;
5737 if (exception.retry) {
5738 rpc_restart_call_prepare(task);
5739 return -EAGAIN;
5740 }
5741 }
5742 if (task->tk_status >= 0) {
5743 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5744 nfs_writeback_update_inode(hdr);
5745 }
5746 return 0;
5747 }
5748
nfs4_write_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5749 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5750 struct nfs_pgio_args *args)
5751 {
5752
5753 if (!nfs4_error_stateid_expired(task->tk_status) ||
5754 nfs4_stateid_is_current(&args->stateid,
5755 args->context,
5756 args->lock_context,
5757 FMODE_WRITE))
5758 return false;
5759 rpc_restart_call_prepare(task);
5760 return true;
5761 }
5762
nfs4_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5763 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5764 {
5765 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5766 return -EAGAIN;
5767 if (nfs4_write_stateid_changed(task, &hdr->args))
5768 return -EAGAIN;
5769 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5770 nfs4_write_done_cb(task, hdr);
5771 }
5772
5773 static
nfs4_write_need_cache_consistency_data(struct nfs_pgio_header * hdr)5774 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5775 {
5776 /* Don't request attributes for pNFS or O_DIRECT writes */
5777 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5778 return false;
5779 /* Otherwise, request attributes if and only if we don't hold
5780 * a delegation
5781 */
5782 return nfs4_have_delegation(hdr->inode, FMODE_READ, 0) == 0;
5783 }
5784
nfs4_bitmask_set(__u32 bitmask[],const __u32 src[],struct inode * inode,unsigned long cache_validity)5785 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5786 struct inode *inode, unsigned long cache_validity)
5787 {
5788 struct nfs_server *server = NFS_SERVER(inode);
5789 unsigned int i;
5790
5791 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5792 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5793
5794 if (cache_validity & NFS_INO_INVALID_CHANGE)
5795 bitmask[0] |= FATTR4_WORD0_CHANGE;
5796 if (cache_validity & NFS_INO_INVALID_ATIME)
5797 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5798 if (cache_validity & NFS_INO_INVALID_MODE)
5799 bitmask[1] |= FATTR4_WORD1_MODE;
5800 if (cache_validity & NFS_INO_INVALID_OTHER)
5801 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5802 if (cache_validity & NFS_INO_INVALID_NLINK)
5803 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5804 if (cache_validity & NFS_INO_INVALID_CTIME)
5805 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5806 if (cache_validity & NFS_INO_INVALID_MTIME)
5807 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5808 if (cache_validity & NFS_INO_INVALID_BLOCKS)
5809 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5810 if (cache_validity & NFS_INO_INVALID_BTIME)
5811 bitmask[1] |= FATTR4_WORD1_TIME_CREATE;
5812
5813 if (cache_validity & NFS_INO_INVALID_SIZE)
5814 bitmask[0] |= FATTR4_WORD0_SIZE;
5815
5816 for (i = 0; i < NFS4_BITMASK_SZ; i++)
5817 bitmask[i] &= server->attr_bitmask[i];
5818 }
5819
nfs4_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)5820 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5821 struct rpc_message *msg,
5822 struct rpc_clnt **clnt)
5823 {
5824 struct nfs_server *server = NFS_SERVER(hdr->inode);
5825
5826 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5827 hdr->args.bitmask = NULL;
5828 hdr->res.fattr = NULL;
5829 } else {
5830 nfs4_bitmask_set(hdr->args.bitmask_store,
5831 server->cache_consistency_bitmask,
5832 hdr->inode, NFS_INO_INVALID_BLOCKS);
5833 hdr->args.bitmask = hdr->args.bitmask_store;
5834 }
5835
5836 if (!hdr->pgio_done_cb)
5837 hdr->pgio_done_cb = nfs4_write_done_cb;
5838 hdr->res.server = server;
5839 hdr->timestamp = jiffies;
5840
5841 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5842 nfs4_init_sequence(server->nfs_client, &hdr->args.seq_args,
5843 &hdr->res.seq_res, 0, 0);
5844 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5845 }
5846
nfs4_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)5847 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5848 {
5849 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5850 &data->args.seq_args,
5851 &data->res.seq_res,
5852 task);
5853 }
5854
nfs4_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)5855 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5856 {
5857 struct inode *inode = data->inode;
5858
5859 trace_nfs4_commit(data, task->tk_status);
5860 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5861 NULL, NULL) == -EAGAIN) {
5862 rpc_restart_call_prepare(task);
5863 return -EAGAIN;
5864 }
5865 return 0;
5866 }
5867
nfs4_commit_done(struct rpc_task * task,struct nfs_commit_data * data)5868 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5869 {
5870 if (!nfs4_sequence_done(task, &data->res.seq_res))
5871 return -EAGAIN;
5872 return data->commit_done_cb(task, data);
5873 }
5874
nfs4_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)5875 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5876 struct rpc_clnt **clnt)
5877 {
5878 struct nfs_server *server = NFS_SERVER(data->inode);
5879
5880 if (data->commit_done_cb == NULL)
5881 data->commit_done_cb = nfs4_commit_done_cb;
5882 data->res.server = server;
5883 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5884 nfs4_init_sequence(server->nfs_client, &data->args.seq_args,
5885 &data->res.seq_res, 1, 0);
5886 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5887 NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5888 }
5889
_nfs4_proc_commit(struct file * dst,struct nfs_commitargs * args,struct nfs_commitres * res)5890 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5891 struct nfs_commitres *res)
5892 {
5893 struct inode *dst_inode = file_inode(dst);
5894 struct nfs_server *server = NFS_SERVER(dst_inode);
5895 struct rpc_message msg = {
5896 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5897 .rpc_argp = args,
5898 .rpc_resp = res,
5899 };
5900
5901 args->fh = NFS_FH(dst_inode);
5902 return nfs4_call_sync(server->client, server, &msg,
5903 &args->seq_args, &res->seq_res, 1);
5904 }
5905
nfs4_proc_commit(struct file * dst,__u64 offset,__u32 count,struct nfs_commitres * res)5906 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5907 {
5908 struct nfs_commitargs args = {
5909 .offset = offset,
5910 .count = count,
5911 };
5912 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5913 struct nfs4_exception exception = { };
5914 int status;
5915
5916 do {
5917 status = _nfs4_proc_commit(dst, &args, res);
5918 status = nfs4_handle_exception(dst_server, status, &exception);
5919 } while (exception.retry);
5920
5921 return status;
5922 }
5923
nfs4_server_supports_acls(const struct nfs_server * server,enum nfs4_acl_type type)5924 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5925 enum nfs4_acl_type type)
5926 {
5927 switch (type) {
5928 default:
5929 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5930 case NFS4ACL_DACL:
5931 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5932 case NFS4ACL_SACL:
5933 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5934 }
5935 }
5936
5937 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5938 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5939 * the stack.
5940 */
5941 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5942
nfs4_buf_to_pages_noslab(const void * buf,size_t buflen,struct page ** pages)5943 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5944 struct page **pages)
5945 {
5946 struct page *newpage, **spages;
5947 int rc = 0;
5948 size_t len;
5949 spages = pages;
5950
5951 do {
5952 len = min_t(size_t, PAGE_SIZE, buflen);
5953 newpage = alloc_page(GFP_KERNEL);
5954
5955 if (newpage == NULL)
5956 goto unwind;
5957 memcpy(page_address(newpage), buf, len);
5958 buf += len;
5959 buflen -= len;
5960 *pages++ = newpage;
5961 rc++;
5962 } while (buflen != 0);
5963
5964 return rc;
5965
5966 unwind:
5967 for(; rc > 0; rc--)
5968 __free_page(spages[rc-1]);
5969 return -ENOMEM;
5970 }
5971
5972 struct nfs4_cached_acl {
5973 enum nfs4_acl_type type;
5974 int cached;
5975 size_t len;
5976 char data[];
5977 };
5978
nfs4_set_cached_acl(struct inode * inode,struct nfs4_cached_acl * acl)5979 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5980 {
5981 struct nfs_inode *nfsi = NFS_I(inode);
5982
5983 spin_lock(&inode->i_lock);
5984 kfree(nfsi->nfs4_acl);
5985 nfsi->nfs4_acl = acl;
5986 spin_unlock(&inode->i_lock);
5987 }
5988
nfs4_zap_acl_attr(struct inode * inode)5989 static void nfs4_zap_acl_attr(struct inode *inode)
5990 {
5991 nfs4_set_cached_acl(inode, NULL);
5992 }
5993
nfs4_read_cached_acl(struct inode * inode,char * buf,size_t buflen,enum nfs4_acl_type type)5994 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5995 size_t buflen, enum nfs4_acl_type type)
5996 {
5997 struct nfs_inode *nfsi = NFS_I(inode);
5998 struct nfs4_cached_acl *acl;
5999 int ret = -ENOENT;
6000
6001 spin_lock(&inode->i_lock);
6002 acl = nfsi->nfs4_acl;
6003 if (acl == NULL)
6004 goto out;
6005 if (acl->type != type)
6006 goto out;
6007 if (buf == NULL) /* user is just asking for length */
6008 goto out_len;
6009 if (acl->cached == 0)
6010 goto out;
6011 ret = -ERANGE; /* see getxattr(2) man page */
6012 if (acl->len > buflen)
6013 goto out;
6014 memcpy(buf, acl->data, acl->len);
6015 out_len:
6016 ret = acl->len;
6017 out:
6018 spin_unlock(&inode->i_lock);
6019 return ret;
6020 }
6021
nfs4_write_cached_acl(struct inode * inode,struct page ** pages,size_t pgbase,size_t acl_len,enum nfs4_acl_type type)6022 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
6023 size_t pgbase, size_t acl_len,
6024 enum nfs4_acl_type type)
6025 {
6026 struct nfs4_cached_acl *acl;
6027 size_t buflen = sizeof(*acl) + acl_len;
6028
6029 if (buflen <= PAGE_SIZE) {
6030 acl = kmalloc(buflen, GFP_KERNEL);
6031 if (acl == NULL)
6032 goto out;
6033 acl->cached = 1;
6034 _copy_from_pages(acl->data, pages, pgbase, acl_len);
6035 } else {
6036 acl = kmalloc_obj(*acl);
6037 if (acl == NULL)
6038 goto out;
6039 acl->cached = 0;
6040 }
6041 acl->type = type;
6042 acl->len = acl_len;
6043 out:
6044 nfs4_set_cached_acl(inode, acl);
6045 }
6046
6047 /*
6048 * The getxattr API returns the required buffer length when called with a
6049 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
6050 * the required buf. On a NULL buf, we send a page of data to the server
6051 * guessing that the ACL request can be serviced by a page. If so, we cache
6052 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
6053 * the cache. If not so, we throw away the page, and cache the required
6054 * length. The next getxattr call will then produce another round trip to
6055 * the server, this time with the input buf of the required size.
6056 */
__nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6057 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
6058 size_t buflen, enum nfs4_acl_type type)
6059 {
6060 struct page **pages;
6061 struct nfs_getaclargs args = {
6062 .fh = NFS_FH(inode),
6063 .acl_type = type,
6064 .acl_len = buflen,
6065 };
6066 struct nfs_getaclres res = {
6067 .acl_type = type,
6068 .acl_len = buflen,
6069 };
6070 struct rpc_message msg = {
6071 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
6072 .rpc_argp = &args,
6073 .rpc_resp = &res,
6074 };
6075 unsigned int npages;
6076 int ret = -ENOMEM, i;
6077 struct nfs_server *server = NFS_SERVER(inode);
6078
6079 if (buflen == 0)
6080 buflen = server->rsize;
6081
6082 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
6083 pages = kmalloc_objs(struct page *, npages);
6084 if (!pages)
6085 return -ENOMEM;
6086
6087 args.acl_pages = pages;
6088
6089 for (i = 0; i < npages; i++) {
6090 pages[i] = alloc_page(GFP_KERNEL);
6091 if (!pages[i])
6092 goto out_free;
6093 }
6094
6095 /* for decoding across pages */
6096 res.acl_scratch = folio_alloc(GFP_KERNEL, 0);
6097 if (!res.acl_scratch)
6098 goto out_free;
6099
6100 args.acl_len = npages * PAGE_SIZE;
6101
6102 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
6103 __func__, buf, buflen, npages, args.acl_len);
6104 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6105 &msg, &args.seq_args, &res.seq_res, 0);
6106 if (ret)
6107 goto out_free;
6108
6109 /* Handle the case where the passed-in buffer is too short */
6110 if (res.acl_flags & NFS4_ACL_TRUNC) {
6111 /* Did the user only issue a request for the acl length? */
6112 if (buf == NULL)
6113 goto out_ok;
6114 ret = -ERANGE;
6115 goto out_free;
6116 }
6117 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6118 type);
6119 if (buf) {
6120 if (res.acl_len > buflen) {
6121 ret = -ERANGE;
6122 goto out_free;
6123 }
6124 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6125 }
6126 out_ok:
6127 ret = res.acl_len;
6128 out_free:
6129 while (--i >= 0)
6130 __free_page(pages[i]);
6131 if (res.acl_scratch)
6132 folio_put(res.acl_scratch);
6133 kfree(pages);
6134 return ret;
6135 }
6136
nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6137 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6138 size_t buflen, enum nfs4_acl_type type)
6139 {
6140 struct nfs4_exception exception = {
6141 .interruptible = true,
6142 };
6143 ssize_t ret;
6144 do {
6145 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6146 trace_nfs4_get_acl(inode, ret);
6147 if (ret >= 0)
6148 break;
6149 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6150 } while (exception.retry);
6151 return ret;
6152 }
6153
nfs4_proc_get_acl(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6154 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6155 enum nfs4_acl_type type)
6156 {
6157 struct nfs_server *server = NFS_SERVER(inode);
6158 int ret;
6159
6160 if (unlikely(NFS_FH(inode)->size == 0))
6161 return -ENODATA;
6162 if (!nfs4_server_supports_acls(server, type))
6163 return -EOPNOTSUPP;
6164 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6165 if (ret < 0)
6166 return ret;
6167 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6168 nfs_zap_acl_cache(inode);
6169 ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6170 if (ret != -ENOENT)
6171 /* -ENOENT is returned if there is no ACL or if there is an ACL
6172 * but no cached acl data, just the acl length */
6173 return ret;
6174 return nfs4_get_acl_uncached(inode, buf, buflen, type);
6175 }
6176
__nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6177 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6178 size_t buflen, enum nfs4_acl_type type)
6179 {
6180 struct nfs_server *server = NFS_SERVER(inode);
6181 struct page *pages[NFS4ACL_MAXPAGES];
6182 struct nfs_setaclargs arg = {
6183 .fh = NFS_FH(inode),
6184 .acl_type = type,
6185 .acl_len = buflen,
6186 .acl_pages = pages,
6187 };
6188 struct nfs_setaclres res;
6189 struct rpc_message msg = {
6190 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6191 .rpc_argp = &arg,
6192 .rpc_resp = &res,
6193 };
6194 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6195 int ret, i;
6196
6197 /* You can't remove system.nfs4_acl: */
6198 if (buflen == 0)
6199 return -EINVAL;
6200 if (!nfs4_server_supports_acls(server, type))
6201 return -EOPNOTSUPP;
6202 if (npages > ARRAY_SIZE(pages))
6203 return -ERANGE;
6204 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6205 if (i < 0)
6206 return i;
6207 nfs4_inode_make_writeable(inode);
6208 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6209
6210 /*
6211 * Free each page after tx, so the only ref left is
6212 * held by the network stack
6213 */
6214 for (; i > 0; i--)
6215 put_page(pages[i-1]);
6216
6217 /*
6218 * Acl update can result in inode attribute update.
6219 * so mark the attribute cache invalid.
6220 */
6221 spin_lock(&inode->i_lock);
6222 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6223 NFS_INO_INVALID_CTIME |
6224 NFS_INO_REVAL_FORCED);
6225 spin_unlock(&inode->i_lock);
6226 nfs_access_zap_cache(inode);
6227 nfs_zap_acl_cache(inode);
6228 return ret;
6229 }
6230
nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6231 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6232 size_t buflen, enum nfs4_acl_type type)
6233 {
6234 struct nfs4_exception exception = { };
6235 int err;
6236
6237 if (unlikely(NFS_FH(inode)->size == 0))
6238 return -ENODATA;
6239 do {
6240 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6241 trace_nfs4_set_acl(inode, err);
6242 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6243 /*
6244 * no need to retry since the kernel
6245 * isn't involved in encoding the ACEs.
6246 */
6247 err = -EINVAL;
6248 break;
6249 }
6250 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6251 &exception);
6252 } while (exception.retry);
6253 return err;
6254 }
6255
6256 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
_nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6257 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6258 size_t buflen)
6259 {
6260 struct nfs_server *server = NFS_SERVER(inode);
6261 struct nfs4_label label = {0, 0, 0, buflen, buf};
6262
6263 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6264 struct nfs_fattr fattr = {
6265 .label = &label,
6266 };
6267 struct nfs4_getattr_arg arg = {
6268 .fh = NFS_FH(inode),
6269 .bitmask = bitmask,
6270 };
6271 struct nfs4_getattr_res res = {
6272 .fattr = &fattr,
6273 .server = server,
6274 };
6275 struct rpc_message msg = {
6276 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6277 .rpc_argp = &arg,
6278 .rpc_resp = &res,
6279 };
6280 int ret;
6281
6282 nfs_fattr_init(&fattr);
6283
6284 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6285 if (ret)
6286 return ret;
6287 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6288 return -ENOENT;
6289 return label.len;
6290 }
6291
nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6292 static int nfs4_get_security_label(struct inode *inode, void *buf,
6293 size_t buflen)
6294 {
6295 struct nfs4_exception exception = {
6296 .interruptible = true,
6297 };
6298 int err;
6299
6300 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6301 return -EOPNOTSUPP;
6302
6303 do {
6304 err = _nfs4_get_security_label(inode, buf, buflen);
6305 trace_nfs4_get_security_label(inode, err);
6306 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6307 &exception);
6308 } while (exception.retry);
6309 return err;
6310 }
6311
_nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6312 static int _nfs4_do_set_security_label(struct inode *inode,
6313 struct nfs4_label *ilabel,
6314 struct nfs_fattr *fattr)
6315 {
6316
6317 struct iattr sattr = {0};
6318 struct nfs_server *server = NFS_SERVER(inode);
6319 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6320 struct nfs_setattrargs arg = {
6321 .fh = NFS_FH(inode),
6322 .iap = &sattr,
6323 .server = server,
6324 .bitmask = bitmask,
6325 .label = ilabel,
6326 };
6327 struct nfs_setattrres res = {
6328 .fattr = fattr,
6329 .server = server,
6330 };
6331 struct rpc_message msg = {
6332 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6333 .rpc_argp = &arg,
6334 .rpc_resp = &res,
6335 };
6336 int status;
6337
6338 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6339
6340 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6341 if (status)
6342 dprintk("%s failed: %d\n", __func__, status);
6343
6344 return status;
6345 }
6346
nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6347 static int nfs4_do_set_security_label(struct inode *inode,
6348 struct nfs4_label *ilabel,
6349 struct nfs_fattr *fattr)
6350 {
6351 struct nfs4_exception exception = { };
6352 int err;
6353
6354 do {
6355 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6356 trace_nfs4_set_security_label(inode, err);
6357 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6358 &exception);
6359 } while (exception.retry);
6360 return err;
6361 }
6362
6363 static int
nfs4_set_security_label(struct inode * inode,const void * buf,size_t buflen)6364 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6365 {
6366 struct nfs4_label ilabel = {0, 0, 0, buflen, (char *)buf };
6367 struct nfs_fattr *fattr;
6368 int status;
6369
6370 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6371 return -EOPNOTSUPP;
6372
6373 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6374 if (fattr == NULL)
6375 return -ENOMEM;
6376
6377 status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6378 if (status == 0)
6379 nfs_setsecurity(inode, fattr);
6380
6381 nfs_free_fattr(fattr);
6382 return status;
6383 }
6384 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
6385
6386
nfs4_init_boot_verifier(const struct nfs_client * clp,nfs4_verifier * bootverf)6387 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6388 nfs4_verifier *bootverf)
6389 {
6390 __be32 verf[2];
6391
6392 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6393 /* An impossible timestamp guarantees this value
6394 * will never match a generated boot time. */
6395 verf[0] = cpu_to_be32(U32_MAX);
6396 verf[1] = cpu_to_be32(U32_MAX);
6397 } else {
6398 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6399 u64 ns = ktime_to_ns(nn->boot_time);
6400
6401 verf[0] = cpu_to_be32(ns >> 32);
6402 verf[1] = cpu_to_be32(ns);
6403 }
6404 memcpy(bootverf->data, verf, sizeof(bootverf->data));
6405 }
6406
6407 static size_t
nfs4_get_uniquifier(struct nfs_client * clp,char * buf,size_t buflen)6408 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6409 {
6410 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6411 struct nfs_netns_client *nn_clp = nn->nfs_client;
6412 const char *id;
6413
6414 buf[0] = '\0';
6415
6416 if (nn_clp) {
6417 rcu_read_lock();
6418 id = rcu_dereference(nn_clp->identifier);
6419 if (id)
6420 strscpy(buf, id, buflen);
6421 rcu_read_unlock();
6422 }
6423
6424 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6425 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6426
6427 return strlen(buf);
6428 }
6429
6430 static int
nfs4_init_nonuniform_client_string(struct nfs_client * clp)6431 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6432 {
6433 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6434 size_t buflen;
6435 size_t len;
6436 char *str;
6437
6438 if (clp->cl_owner_id != NULL)
6439 return 0;
6440
6441 rcu_read_lock();
6442 len = 14 +
6443 strlen(clp->cl_rpcclient->cl_nodename) +
6444 1 +
6445 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6446 1;
6447 rcu_read_unlock();
6448
6449 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6450 if (buflen)
6451 len += buflen + 1;
6452
6453 if (len > NFS4_OPAQUE_LIMIT + 1)
6454 return -EINVAL;
6455
6456 /*
6457 * Since this string is allocated at mount time, and held until the
6458 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6459 * about a memory-reclaim deadlock.
6460 */
6461 str = kmalloc(len, GFP_KERNEL);
6462 if (!str)
6463 return -ENOMEM;
6464
6465 rcu_read_lock();
6466 if (buflen)
6467 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6468 clp->cl_rpcclient->cl_nodename, buf,
6469 rpc_peeraddr2str(clp->cl_rpcclient,
6470 RPC_DISPLAY_ADDR));
6471 else
6472 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6473 clp->cl_rpcclient->cl_nodename,
6474 rpc_peeraddr2str(clp->cl_rpcclient,
6475 RPC_DISPLAY_ADDR));
6476 rcu_read_unlock();
6477
6478 clp->cl_owner_id = str;
6479 return 0;
6480 }
6481
6482 static int
nfs4_init_uniform_client_string(struct nfs_client * clp)6483 nfs4_init_uniform_client_string(struct nfs_client *clp)
6484 {
6485 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6486 size_t buflen;
6487 size_t len;
6488 char *str;
6489
6490 if (clp->cl_owner_id != NULL)
6491 return 0;
6492
6493 len = 10 + 10 + 1 + 10 + 1 +
6494 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6495
6496 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6497 if (buflen)
6498 len += buflen + 1;
6499
6500 if (len > NFS4_OPAQUE_LIMIT + 1)
6501 return -EINVAL;
6502
6503 /*
6504 * Since this string is allocated at mount time, and held until the
6505 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6506 * about a memory-reclaim deadlock.
6507 */
6508 str = kmalloc(len, GFP_KERNEL);
6509 if (!str)
6510 return -ENOMEM;
6511
6512 if (buflen)
6513 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6514 clp->rpc_ops->version, clp->cl_minorversion,
6515 buf, clp->cl_rpcclient->cl_nodename);
6516 else
6517 scnprintf(str, len, "Linux NFSv%u.%u %s",
6518 clp->rpc_ops->version, clp->cl_minorversion,
6519 clp->cl_rpcclient->cl_nodename);
6520 clp->cl_owner_id = str;
6521 return 0;
6522 }
6523
6524 /*
6525 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6526 * services. Advertise one based on the address family of the
6527 * clientaddr.
6528 */
6529 static unsigned int
nfs4_init_callback_netid(const struct nfs_client * clp,char * buf,size_t len)6530 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6531 {
6532 if (strchr(clp->cl_ipaddr, ':') != NULL)
6533 return scnprintf(buf, len, "tcp6");
6534 else
6535 return scnprintf(buf, len, "tcp");
6536 }
6537
nfs4_setclientid_done(struct rpc_task * task,void * calldata)6538 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6539 {
6540 struct nfs4_setclientid *sc = calldata;
6541
6542 if (task->tk_status == 0)
6543 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6544 }
6545
6546 static const struct rpc_call_ops nfs4_setclientid_ops = {
6547 .rpc_call_done = nfs4_setclientid_done,
6548 };
6549
6550 /**
6551 * nfs4_proc_setclientid - Negotiate client ID
6552 * @clp: state data structure
6553 * @program: RPC program for NFSv4 callback service
6554 * @port: IP port number for NFS4 callback service
6555 * @cred: credential to use for this call
6556 * @res: where to place the result
6557 *
6558 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6559 */
nfs4_proc_setclientid(struct nfs_client * clp,u32 program,unsigned short port,const struct cred * cred,struct nfs4_setclientid_res * res)6560 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6561 unsigned short port, const struct cred *cred,
6562 struct nfs4_setclientid_res *res)
6563 {
6564 nfs4_verifier sc_verifier;
6565 struct nfs4_setclientid setclientid = {
6566 .sc_verifier = &sc_verifier,
6567 .sc_prog = program,
6568 .sc_clnt = clp,
6569 };
6570 struct rpc_message msg = {
6571 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6572 .rpc_argp = &setclientid,
6573 .rpc_resp = res,
6574 .rpc_cred = cred,
6575 };
6576 struct rpc_task_setup task_setup_data = {
6577 .rpc_client = clp->cl_rpcclient,
6578 .rpc_message = &msg,
6579 .callback_ops = &nfs4_setclientid_ops,
6580 .callback_data = &setclientid,
6581 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6582 };
6583 unsigned long now = jiffies;
6584 int status;
6585
6586 /* nfs_client_id4 */
6587 nfs4_init_boot_verifier(clp, &sc_verifier);
6588
6589 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6590 status = nfs4_init_uniform_client_string(clp);
6591 else
6592 status = nfs4_init_nonuniform_client_string(clp);
6593
6594 if (status)
6595 goto out;
6596
6597 /* cb_client4 */
6598 setclientid.sc_netid_len =
6599 nfs4_init_callback_netid(clp,
6600 setclientid.sc_netid,
6601 sizeof(setclientid.sc_netid));
6602 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6603 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6604 clp->cl_ipaddr, port >> 8, port & 255);
6605
6606 dprintk("NFS call setclientid auth=%s, '%s'\n",
6607 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6608 clp->cl_owner_id);
6609
6610 status = nfs4_call_sync_custom(&task_setup_data);
6611 if (setclientid.sc_cred) {
6612 kfree(clp->cl_acceptor);
6613 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6614 put_rpccred(setclientid.sc_cred);
6615 }
6616
6617 if (status == 0)
6618 do_renew_lease(clp, now);
6619 out:
6620 trace_nfs4_setclientid(clp, status);
6621 dprintk("NFS reply setclientid: %d\n", status);
6622 return status;
6623 }
6624
6625 /**
6626 * nfs4_proc_setclientid_confirm - Confirm client ID
6627 * @clp: state data structure
6628 * @arg: result of a previous SETCLIENTID
6629 * @cred: credential to use for this call
6630 *
6631 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6632 */
nfs4_proc_setclientid_confirm(struct nfs_client * clp,struct nfs4_setclientid_res * arg,const struct cred * cred)6633 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6634 struct nfs4_setclientid_res *arg,
6635 const struct cred *cred)
6636 {
6637 struct rpc_message msg = {
6638 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6639 .rpc_argp = arg,
6640 .rpc_cred = cred,
6641 };
6642 int status;
6643
6644 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
6645 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6646 clp->cl_clientid);
6647 status = rpc_call_sync(clp->cl_rpcclient, &msg,
6648 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6649 trace_nfs4_setclientid_confirm(clp, status);
6650 dprintk("NFS reply setclientid_confirm: %d\n", status);
6651 return status;
6652 }
6653
6654 struct nfs4_delegreturndata {
6655 struct nfs4_delegreturnargs args;
6656 struct nfs4_delegreturnres res;
6657 struct nfs_fh fh;
6658 nfs4_stateid stateid;
6659 unsigned long timestamp;
6660 unsigned short retrans;
6661 struct {
6662 struct nfs4_layoutreturn_args arg;
6663 struct nfs4_layoutreturn_res res;
6664 struct nfs4_xdr_opaque_data ld_private;
6665 u32 roc_barrier;
6666 bool roc;
6667 } lr;
6668 struct nfs4_delegattr sattr;
6669 struct nfs_fattr fattr;
6670 int rpc_status;
6671 struct inode *inode;
6672 };
6673
nfs4_delegreturn_done(struct rpc_task * task,void * calldata)6674 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6675 {
6676 struct nfs4_delegreturndata *data = calldata;
6677 struct nfs4_exception exception = {
6678 .inode = data->inode,
6679 .stateid = &data->stateid,
6680 .task_is_privileged = data->args.seq_args.sa_privileged,
6681 .retrans = data->retrans,
6682 };
6683
6684 if (!nfs4_sequence_done(task, &data->res.seq_res))
6685 return;
6686
6687 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6688
6689 /* Handle Layoutreturn errors */
6690 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6691 &data->res.lr_ret) == -EAGAIN)
6692 goto out_restart;
6693
6694 if (data->args.sattr_args && task->tk_status != 0) {
6695 switch(data->res.sattr_ret) {
6696 case 0:
6697 data->args.sattr_args = NULL;
6698 data->res.sattr_res = false;
6699 break;
6700 case -NFS4ERR_ADMIN_REVOKED:
6701 case -NFS4ERR_DELEG_REVOKED:
6702 case -NFS4ERR_EXPIRED:
6703 case -NFS4ERR_BAD_STATEID:
6704 /* Let the main handler below do stateid recovery */
6705 break;
6706 case -NFS4ERR_OLD_STATEID:
6707 if (nfs4_refresh_delegation_stateid(&data->stateid,
6708 data->inode))
6709 goto out_restart;
6710 fallthrough;
6711 default:
6712 data->args.sattr_args = NULL;
6713 data->res.sattr_res = false;
6714 goto out_restart;
6715 }
6716 }
6717
6718 switch (task->tk_status) {
6719 case 0:
6720 renew_lease(data->res.server, data->timestamp);
6721 break;
6722 case -NFS4ERR_ADMIN_REVOKED:
6723 case -NFS4ERR_DELEG_REVOKED:
6724 case -NFS4ERR_EXPIRED:
6725 nfs4_free_revoked_stateid(data->res.server,
6726 data->args.stateid,
6727 task->tk_msg.rpc_cred);
6728 fallthrough;
6729 case -NFS4ERR_BAD_STATEID:
6730 case -NFS4ERR_STALE_STATEID:
6731 case -ETIMEDOUT:
6732 task->tk_status = 0;
6733 break;
6734 case -NFS4ERR_OLD_STATEID:
6735 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6736 nfs4_stateid_seqid_inc(&data->stateid);
6737 if (data->args.bitmask) {
6738 data->args.bitmask = NULL;
6739 data->res.fattr = NULL;
6740 }
6741 goto out_restart;
6742 case -NFS4ERR_ACCESS:
6743 if (data->args.bitmask) {
6744 data->args.bitmask = NULL;
6745 data->res.fattr = NULL;
6746 goto out_restart;
6747 }
6748 fallthrough;
6749 default:
6750 task->tk_status = nfs4_async_handle_exception(task,
6751 data->res.server, task->tk_status,
6752 &exception);
6753 data->retrans = exception.retrans;
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_obj(*data);
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, issync);
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 nfs4_init_sequence(server->nfs_client, &data->args.seq_args,
6882 &data->res.seq_res, 1, !data->inode ? 1 : 0);
6883
6884 task_setup_data.callback_data = data;
6885 msg.rpc_argp = &data->args;
6886 msg.rpc_resp = &data->res;
6887 task = rpc_run_task(&task_setup_data);
6888 if (IS_ERR(task))
6889 return PTR_ERR(task);
6890 if (!issync)
6891 goto out;
6892 status = rpc_wait_for_completion_task(task);
6893 if (status != 0)
6894 goto out;
6895 status = data->rpc_status;
6896 out:
6897 rpc_put_task(task);
6898 return status;
6899 }
6900
nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6901 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6902 const nfs4_stateid *stateid,
6903 struct nfs_delegation *delegation, int issync)
6904 {
6905 struct nfs_server *server = NFS_SERVER(inode);
6906 struct nfs4_exception exception = { };
6907 int err;
6908 do {
6909 err = _nfs4_proc_delegreturn(inode, cred, stateid,
6910 delegation, issync);
6911 trace_nfs4_delegreturn(inode, stateid, err);
6912 switch (err) {
6913 case -NFS4ERR_STALE_STATEID:
6914 case -NFS4ERR_EXPIRED:
6915 case 0:
6916 return 0;
6917 }
6918 err = nfs4_handle_exception(server, err, &exception);
6919 } while (exception.retry);
6920 return err;
6921 }
6922
_nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6923 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6924 {
6925 struct inode *inode = state->inode;
6926 struct nfs_server *server = NFS_SERVER(inode);
6927 struct nfs_client *clp = server->nfs_client;
6928 struct nfs_lockt_args arg = {
6929 .fh = NFS_FH(inode),
6930 .fl = request,
6931 };
6932 struct nfs_lockt_res res = {
6933 .denied = request,
6934 };
6935 struct rpc_message msg = {
6936 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6937 .rpc_argp = &arg,
6938 .rpc_resp = &res,
6939 .rpc_cred = state->owner->so_cred,
6940 };
6941 struct nfs4_lock_state *lsp;
6942 int status;
6943
6944 arg.lock_owner.clientid = clp->cl_clientid;
6945 status = nfs4_set_lock_state(state, request);
6946 if (status != 0)
6947 goto out;
6948 lsp = request->fl_u.nfs4_fl.owner;
6949 arg.lock_owner.id = lsp->ls_seqid.owner_id;
6950 arg.lock_owner.s_dev = server->s_dev;
6951 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6952 switch (status) {
6953 case 0:
6954 request->c.flc_type = F_UNLCK;
6955 break;
6956 case -NFS4ERR_DENIED:
6957 status = 0;
6958 }
6959 request->fl_ops->fl_release_private(request);
6960 request->fl_ops = NULL;
6961 out:
6962 return status;
6963 }
6964
nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6965 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6966 {
6967 struct nfs4_exception exception = {
6968 .interruptible = true,
6969 };
6970 int err;
6971
6972 do {
6973 err = _nfs4_proc_getlk(state, cmd, request);
6974 trace_nfs4_get_lock(request, state, cmd, err);
6975 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6976 &exception);
6977 } while (exception.retry);
6978 return err;
6979 }
6980
6981 /*
6982 * Update the seqid of a lock stateid after receiving
6983 * NFS4ERR_OLD_STATEID
6984 */
nfs4_refresh_lock_old_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6985 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6986 struct nfs4_lock_state *lsp)
6987 {
6988 struct nfs4_state *state = lsp->ls_state;
6989 bool ret = false;
6990
6991 spin_lock(&state->state_lock);
6992 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6993 goto out;
6994 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6995 nfs4_stateid_seqid_inc(dst);
6996 else
6997 dst->seqid = lsp->ls_stateid.seqid;
6998 ret = true;
6999 out:
7000 spin_unlock(&state->state_lock);
7001 return ret;
7002 }
7003
nfs4_sync_lock_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)7004 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
7005 struct nfs4_lock_state *lsp)
7006 {
7007 struct nfs4_state *state = lsp->ls_state;
7008 bool ret;
7009
7010 spin_lock(&state->state_lock);
7011 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
7012 nfs4_stateid_copy(dst, &lsp->ls_stateid);
7013 spin_unlock(&state->state_lock);
7014 return ret;
7015 }
7016
7017 struct nfs4_unlockdata {
7018 struct nfs_locku_args arg;
7019 struct nfs_locku_res res;
7020 struct nfs4_lock_state *lsp;
7021 struct nfs_open_context *ctx;
7022 struct nfs_lock_context *l_ctx;
7023 struct file_lock fl;
7024 struct nfs_server *server;
7025 unsigned long timestamp;
7026 unsigned short retrans;
7027 };
7028
nfs4_alloc_unlockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7029 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
7030 struct nfs_open_context *ctx,
7031 struct nfs4_lock_state *lsp,
7032 struct nfs_seqid *seqid)
7033 {
7034 struct nfs4_unlockdata *p;
7035 struct nfs4_state *state = lsp->ls_state;
7036 struct inode *inode = state->inode;
7037 struct nfs_lock_context *l_ctx;
7038
7039 p = kzalloc_obj(*p);
7040 if (p == NULL)
7041 return NULL;
7042 l_ctx = nfs_get_lock_context(ctx);
7043 if (!IS_ERR(l_ctx)) {
7044 p->l_ctx = l_ctx;
7045 } else {
7046 kfree(p);
7047 return NULL;
7048 }
7049 p->arg.fh = NFS_FH(inode);
7050 p->arg.fl = &p->fl;
7051 p->arg.seqid = seqid;
7052 p->res.seqid = seqid;
7053 p->lsp = lsp;
7054 /* Ensure we don't close file until we're done freeing locks! */
7055 p->ctx = get_nfs_open_context(ctx);
7056 locks_init_lock(&p->fl);
7057 locks_copy_lock(&p->fl, fl);
7058 p->server = NFS_SERVER(inode);
7059 spin_lock(&state->state_lock);
7060 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
7061 spin_unlock(&state->state_lock);
7062 return p;
7063 }
7064
nfs4_locku_release_calldata(void * data)7065 static void nfs4_locku_release_calldata(void *data)
7066 {
7067 struct nfs4_unlockdata *calldata = data;
7068 nfs_free_seqid(calldata->arg.seqid);
7069 nfs4_put_lock_state(calldata->lsp);
7070 nfs_put_lock_context(calldata->l_ctx);
7071 put_nfs_open_context(calldata->ctx);
7072 kfree(calldata);
7073 }
7074
nfs4_locku_done(struct rpc_task * task,void * data)7075 static void nfs4_locku_done(struct rpc_task *task, void *data)
7076 {
7077 struct nfs4_unlockdata *calldata = data;
7078 struct nfs4_exception exception = {
7079 .inode = calldata->lsp->ls_state->inode,
7080 .stateid = &calldata->arg.stateid,
7081 .retrans = calldata->retrans,
7082 };
7083
7084 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
7085 return;
7086 switch (task->tk_status) {
7087 case 0:
7088 renew_lease(calldata->server, calldata->timestamp);
7089 if (nfs4_update_lock_stateid(calldata->lsp,
7090 &calldata->res.stateid))
7091 break;
7092 fallthrough;
7093 case -NFS4ERR_ADMIN_REVOKED:
7094 case -NFS4ERR_EXPIRED:
7095 nfs4_free_revoked_stateid(calldata->server,
7096 &calldata->arg.stateid,
7097 task->tk_msg.rpc_cred);
7098 fallthrough;
7099 case -NFS4ERR_BAD_STATEID:
7100 case -NFS4ERR_STALE_STATEID:
7101 if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
7102 calldata->lsp))
7103 rpc_restart_call_prepare(task);
7104 break;
7105 case -NFS4ERR_OLD_STATEID:
7106 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
7107 calldata->lsp))
7108 rpc_restart_call_prepare(task);
7109 break;
7110 default:
7111 task->tk_status = nfs4_async_handle_exception(task,
7112 calldata->server, task->tk_status,
7113 &exception);
7114 calldata->retrans = exception.retrans;
7115 if (exception.retry)
7116 rpc_restart_call_prepare(task);
7117 }
7118 nfs_release_seqid(calldata->arg.seqid);
7119 }
7120
nfs4_locku_prepare(struct rpc_task * task,void * data)7121 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
7122 {
7123 struct nfs4_unlockdata *calldata = data;
7124
7125 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
7126 nfs_async_iocounter_wait(task, calldata->l_ctx))
7127 return;
7128
7129 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
7130 goto out_wait;
7131 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
7132 /* Note: exit _without_ running nfs4_locku_done */
7133 goto out_no_action;
7134 }
7135 calldata->timestamp = jiffies;
7136 if (nfs4_setup_sequence(calldata->server->nfs_client,
7137 &calldata->arg.seq_args,
7138 &calldata->res.seq_res,
7139 task) != 0)
7140 nfs_release_seqid(calldata->arg.seqid);
7141 return;
7142 out_no_action:
7143 task->tk_action = NULL;
7144 out_wait:
7145 nfs4_sequence_done(task, &calldata->res.seq_res);
7146 }
7147
7148 static const struct rpc_call_ops nfs4_locku_ops = {
7149 .rpc_call_prepare = nfs4_locku_prepare,
7150 .rpc_call_done = nfs4_locku_done,
7151 .rpc_release = nfs4_locku_release_calldata,
7152 };
7153
nfs4_do_unlck(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7154 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
7155 struct nfs_open_context *ctx,
7156 struct nfs4_lock_state *lsp,
7157 struct nfs_seqid *seqid)
7158 {
7159 struct nfs4_unlockdata *data;
7160 struct nfs_client *clp = NFS_SERVER(lsp->ls_state->inode)->nfs_client;
7161 struct rpc_message msg = {
7162 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
7163 .rpc_cred = ctx->cred,
7164 };
7165 struct rpc_task_setup task_setup_data = {
7166 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7167 .rpc_message = &msg,
7168 .callback_ops = &nfs4_locku_ops,
7169 .workqueue = nfsiod_workqueue,
7170 .flags = RPC_TASK_ASYNC,
7171 };
7172
7173 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7174 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7175
7176 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_CLEANUP,
7177 &task_setup_data.rpc_client, &msg);
7178
7179 /* Ensure this is an unlock - when canceling a lock, the
7180 * canceled lock is passed in, and it won't be an unlock.
7181 */
7182 fl->c.flc_type = F_UNLCK;
7183 if (fl->c.flc_flags & FL_CLOSE)
7184 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7185
7186 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7187 if (data == NULL) {
7188 nfs_free_seqid(seqid);
7189 return ERR_PTR(-ENOMEM);
7190 }
7191
7192 nfs4_init_sequence(clp, &data->arg.seq_args, &data->res.seq_res, 1, 0);
7193 msg.rpc_argp = &data->arg;
7194 msg.rpc_resp = &data->res;
7195 task_setup_data.callback_data = data;
7196 return rpc_run_task(&task_setup_data);
7197 }
7198
nfs4_proc_unlck(struct nfs4_state * state,int cmd,struct file_lock * request)7199 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7200 {
7201 struct inode *inode = state->inode;
7202 struct nfs4_state_owner *sp = state->owner;
7203 struct nfs_inode *nfsi = NFS_I(inode);
7204 struct nfs_seqid *seqid;
7205 struct nfs4_lock_state *lsp;
7206 struct rpc_task *task;
7207 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7208 int status = 0;
7209 unsigned char saved_flags = request->c.flc_flags;
7210
7211 status = nfs4_set_lock_state(state, request);
7212 /* Unlock _before_ we do the RPC call */
7213 request->c.flc_flags |= FL_EXISTS;
7214 /* Exclude nfs_delegation_claim_locks() */
7215 mutex_lock(&sp->so_delegreturn_mutex);
7216 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7217 down_read(&nfsi->rwsem);
7218 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7219 up_read(&nfsi->rwsem);
7220 mutex_unlock(&sp->so_delegreturn_mutex);
7221 goto out;
7222 }
7223 lsp = request->fl_u.nfs4_fl.owner;
7224 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7225 up_read(&nfsi->rwsem);
7226 mutex_unlock(&sp->so_delegreturn_mutex);
7227 if (status != 0)
7228 goto out;
7229 /* Is this a delegated lock? */
7230 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7231 goto out;
7232 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7233 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7234 status = -ENOMEM;
7235 if (IS_ERR(seqid))
7236 goto out;
7237 task = nfs4_do_unlck(request,
7238 nfs_file_open_context(request->c.flc_file),
7239 lsp, seqid);
7240 status = PTR_ERR(task);
7241 if (IS_ERR(task))
7242 goto out;
7243 status = rpc_wait_for_completion_task(task);
7244 rpc_put_task(task);
7245 out:
7246 request->c.flc_flags = saved_flags;
7247 trace_nfs4_unlock(request, state, F_SETLK, status);
7248 return status;
7249 }
7250
7251 struct nfs4_lockdata {
7252 struct nfs_lock_args arg;
7253 struct nfs_lock_res res;
7254 struct nfs4_lock_state *lsp;
7255 struct nfs_open_context *ctx;
7256 struct file_lock fl;
7257 unsigned long timestamp;
7258 int rpc_status;
7259 int cancelled;
7260 struct nfs_server *server;
7261 };
7262
nfs4_alloc_lockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,gfp_t gfp_mask)7263 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7264 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7265 gfp_t gfp_mask)
7266 {
7267 struct nfs4_lockdata *p;
7268 struct inode *inode = lsp->ls_state->inode;
7269 struct nfs_server *server = NFS_SERVER(inode);
7270 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7271
7272 p = kzalloc_obj(*p, gfp_mask);
7273 if (p == NULL)
7274 return NULL;
7275
7276 p->arg.fh = NFS_FH(inode);
7277 p->arg.fl = &p->fl;
7278 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7279 if (IS_ERR(p->arg.open_seqid))
7280 goto out_free;
7281 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7282 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7283 if (IS_ERR(p->arg.lock_seqid))
7284 goto out_free_seqid;
7285 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7286 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7287 p->arg.lock_owner.s_dev = server->s_dev;
7288 p->res.lock_seqid = p->arg.lock_seqid;
7289 p->lsp = lsp;
7290 p->server = server;
7291 p->ctx = get_nfs_open_context(ctx);
7292 locks_init_lock(&p->fl);
7293 locks_copy_lock(&p->fl, fl);
7294 return p;
7295 out_free_seqid:
7296 nfs_free_seqid(p->arg.open_seqid);
7297 out_free:
7298 kfree(p);
7299 return NULL;
7300 }
7301
nfs4_lock_prepare(struct rpc_task * task,void * calldata)7302 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7303 {
7304 struct nfs4_lockdata *data = calldata;
7305 struct nfs4_state *state = data->lsp->ls_state;
7306
7307 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7308 goto out_wait;
7309 /* Do we need to do an open_to_lock_owner? */
7310 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7311 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7312 goto out_release_lock_seqid;
7313 }
7314 nfs4_stateid_copy(&data->arg.open_stateid,
7315 &state->open_stateid);
7316 data->arg.new_lock_owner = 1;
7317 data->res.open_seqid = data->arg.open_seqid;
7318 } else {
7319 data->arg.new_lock_owner = 0;
7320 nfs4_stateid_copy(&data->arg.lock_stateid,
7321 &data->lsp->ls_stateid);
7322 }
7323 if (!nfs4_valid_open_stateid(state)) {
7324 data->rpc_status = -EBADF;
7325 task->tk_action = NULL;
7326 goto out_release_open_seqid;
7327 }
7328 data->timestamp = jiffies;
7329 if (nfs4_setup_sequence(data->server->nfs_client,
7330 &data->arg.seq_args,
7331 &data->res.seq_res,
7332 task) == 0)
7333 return;
7334 out_release_open_seqid:
7335 nfs_release_seqid(data->arg.open_seqid);
7336 out_release_lock_seqid:
7337 nfs_release_seqid(data->arg.lock_seqid);
7338 out_wait:
7339 nfs4_sequence_done(task, &data->res.seq_res);
7340 dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7341 }
7342
nfs4_lock_done(struct rpc_task * task,void * calldata)7343 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7344 {
7345 struct nfs4_lockdata *data = calldata;
7346 struct nfs4_lock_state *lsp = data->lsp;
7347
7348 if (!nfs4_sequence_done(task, &data->res.seq_res))
7349 return;
7350
7351 data->rpc_status = task->tk_status;
7352 switch (task->tk_status) {
7353 case 0:
7354 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7355 data->timestamp);
7356 if (data->arg.new_lock_owner != 0) {
7357 nfs_confirm_seqid(&lsp->ls_seqid, 0);
7358 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7359 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7360 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7361 goto out_restart;
7362 break;
7363 case -NFS4ERR_OLD_STATEID:
7364 if (data->arg.new_lock_owner != 0 &&
7365 nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7366 lsp->ls_state))
7367 goto out_restart;
7368 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7369 goto out_restart;
7370 fallthrough;
7371 case -NFS4ERR_BAD_STATEID:
7372 case -NFS4ERR_STALE_STATEID:
7373 case -NFS4ERR_EXPIRED:
7374 if (data->arg.new_lock_owner != 0) {
7375 if (!nfs4_stateid_match(&data->arg.open_stateid,
7376 &lsp->ls_state->open_stateid))
7377 goto out_restart;
7378 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7379 &lsp->ls_stateid))
7380 goto out_restart;
7381 }
7382 out_done:
7383 dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7384 return;
7385 out_restart:
7386 if (!data->cancelled)
7387 rpc_restart_call_prepare(task);
7388 goto out_done;
7389 }
7390
nfs4_lock_release(void * calldata)7391 static void nfs4_lock_release(void *calldata)
7392 {
7393 struct nfs4_lockdata *data = calldata;
7394
7395 nfs_free_seqid(data->arg.open_seqid);
7396 if (data->cancelled && data->rpc_status == 0) {
7397 struct rpc_task *task;
7398 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7399 data->arg.lock_seqid);
7400 if (!IS_ERR(task))
7401 rpc_put_task_async(task);
7402 dprintk("%s: cancelling lock!\n", __func__);
7403 } else
7404 nfs_free_seqid(data->arg.lock_seqid);
7405 nfs4_put_lock_state(data->lsp);
7406 put_nfs_open_context(data->ctx);
7407 kfree(data);
7408 }
7409
7410 static const struct rpc_call_ops nfs4_lock_ops = {
7411 .rpc_call_prepare = nfs4_lock_prepare,
7412 .rpc_call_done = nfs4_lock_done,
7413 .rpc_release = nfs4_lock_release,
7414 };
7415
nfs4_handle_setlk_error(struct nfs_server * server,struct nfs4_lock_state * lsp,int new_lock_owner,int error)7416 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7417 {
7418 switch (error) {
7419 case -NFS4ERR_ADMIN_REVOKED:
7420 case -NFS4ERR_EXPIRED:
7421 case -NFS4ERR_BAD_STATEID:
7422 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7423 if (new_lock_owner != 0 ||
7424 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7425 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7426 break;
7427 case -NFS4ERR_STALE_STATEID:
7428 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7429 nfs4_schedule_lease_recovery(server->nfs_client);
7430 }
7431 }
7432
_nfs4_do_setlk(struct nfs4_state * state,int cmd,struct file_lock * fl,int recovery_type)7433 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7434 {
7435 struct nfs4_lockdata *data;
7436 struct rpc_task *task;
7437 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
7438 struct rpc_message msg = {
7439 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7440 .rpc_cred = state->owner->so_cred,
7441 };
7442 struct rpc_task_setup task_setup_data = {
7443 .rpc_client = NFS_CLIENT(state->inode),
7444 .rpc_message = &msg,
7445 .callback_ops = &nfs4_lock_ops,
7446 .workqueue = nfsiod_workqueue,
7447 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7448 };
7449 int ret;
7450
7451 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7452 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7453
7454 data = nfs4_alloc_lockdata(fl,
7455 nfs_file_open_context(fl->c.flc_file),
7456 fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7457 if (data == NULL)
7458 return -ENOMEM;
7459 if (IS_SETLKW(cmd))
7460 data->arg.block = 1;
7461 nfs4_init_sequence(clp, &data->arg.seq_args, &data->res.seq_res, 1,
7462 recovery_type > NFS_LOCK_NEW);
7463 msg.rpc_argp = &data->arg;
7464 msg.rpc_resp = &data->res;
7465 task_setup_data.callback_data = data;
7466
7467 if (recovery_type == NFS_LOCK_RECLAIM)
7468 data->arg.reclaim = NFS_LOCK_RECLAIM;
7469
7470 task = rpc_run_task(&task_setup_data);
7471 if (IS_ERR(task))
7472 return PTR_ERR(task);
7473 ret = rpc_wait_for_completion_task(task);
7474 if (ret == 0) {
7475 ret = data->rpc_status;
7476 if (ret)
7477 nfs4_handle_setlk_error(data->server, data->lsp,
7478 data->arg.new_lock_owner, ret);
7479 } else
7480 data->cancelled = true;
7481 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7482 rpc_put_task(task);
7483 dprintk("%s: ret = %d\n", __func__, ret);
7484 return ret;
7485 }
7486
nfs4_lock_reclaim(struct nfs4_state * state,struct file_lock * request)7487 int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7488 {
7489 struct nfs_server *server = NFS_SERVER(state->inode);
7490 struct nfs4_exception exception = {
7491 .inode = state->inode,
7492 };
7493 int err;
7494
7495 do {
7496 /* Cache the lock if possible... */
7497 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7498 return 0;
7499 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7500 if (err != -NFS4ERR_DELAY)
7501 break;
7502 nfs4_handle_exception(server, err, &exception);
7503 } while (exception.retry);
7504 return err;
7505 }
7506
nfs4_lock_expired(struct nfs4_state * state,struct file_lock * request)7507 int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7508 {
7509 struct nfs_server *server = NFS_SERVER(state->inode);
7510 struct nfs4_exception exception = {
7511 .inode = state->inode,
7512 };
7513 int err;
7514
7515 err = nfs4_set_lock_state(state, request);
7516 if (err != 0)
7517 return err;
7518 if (!recover_lost_locks) {
7519 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7520 return 0;
7521 }
7522 do {
7523 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7524 return 0;
7525 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7526 switch (err) {
7527 default:
7528 goto out;
7529 case -NFS4ERR_GRACE:
7530 case -NFS4ERR_DELAY:
7531 nfs4_handle_exception(server, err, &exception);
7532 err = 0;
7533 }
7534 } while (exception.retry);
7535 out:
7536 return err;
7537 }
7538
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
_nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7554 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7555 {
7556 struct nfs_inode *nfsi = NFS_I(state->inode);
7557 struct nfs4_state_owner *sp = state->owner;
7558 unsigned char flags = request->c.flc_flags;
7559 int status;
7560
7561 request->c.flc_flags |= FL_ACCESS;
7562 status = locks_lock_inode_wait(state->inode, request);
7563 if (status < 0)
7564 goto out;
7565 mutex_lock(&sp->so_delegreturn_mutex);
7566 down_read(&nfsi->rwsem);
7567 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7568 /* Yes: cache locks! */
7569 /* ...but avoid races with delegation recall... */
7570 request->c.flc_flags = flags & ~FL_SLEEP;
7571 status = locks_lock_inode_wait(state->inode, request);
7572 up_read(&nfsi->rwsem);
7573 mutex_unlock(&sp->so_delegreturn_mutex);
7574 goto out;
7575 }
7576 up_read(&nfsi->rwsem);
7577 mutex_unlock(&sp->so_delegreturn_mutex);
7578 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7579 if (status)
7580 goto out;
7581
7582 down_read(&nfsi->rwsem);
7583 request->c.flc_flags &= ~(FL_SLEEP | FL_ACCESS);
7584 status = locks_lock_inode_wait(state->inode, request);
7585 up_read(&nfsi->rwsem);
7586 out:
7587 request->c.flc_flags = flags;
7588 return status;
7589 }
7590
nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7591 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7592 {
7593 struct nfs4_exception exception = {
7594 .state = state,
7595 .inode = state->inode,
7596 .interruptible = true,
7597 };
7598 int err;
7599
7600 do {
7601 err = _nfs4_proc_setlk(state, cmd, request);
7602 if (err == -NFS4ERR_DENIED)
7603 err = -EAGAIN;
7604 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7605 err, &exception);
7606 } while (exception.retry);
7607 return err;
7608 }
7609
7610 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7611 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7612
7613 static int
nfs4_retry_setlk_simple(struct nfs4_state * state,int cmd,struct file_lock * request)7614 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7615 struct file_lock *request)
7616 {
7617 int status = -ERESTARTSYS;
7618 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
7619
7620 while(!signalled()) {
7621 status = nfs4_proc_setlk(state, cmd, request);
7622 if ((status != -EAGAIN) || IS_SETLK(cmd))
7623 break;
7624 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7625 schedule_timeout(timeout);
7626 timeout *= 2;
7627 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7628 status = -ERESTARTSYS;
7629 }
7630 return status;
7631 }
7632
7633 struct nfs4_lock_waiter {
7634 struct inode *inode;
7635 struct nfs_lowner owner;
7636 wait_queue_entry_t wait;
7637 };
7638
7639 static int
nfs4_wake_lock_waiter(wait_queue_entry_t * wait,unsigned int mode,int flags,void * key)7640 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7641 {
7642 struct nfs4_lock_waiter *waiter =
7643 container_of(wait, struct nfs4_lock_waiter, wait);
7644
7645 /* NULL key means to wake up everyone */
7646 if (key) {
7647 struct cb_notify_lock_args *cbnl = key;
7648 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
7649 *wowner = &waiter->owner;
7650
7651 /* Only wake if the callback was for the same owner. */
7652 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7653 return 0;
7654
7655 /* Make sure it's for the right inode */
7656 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7657 return 0;
7658 }
7659
7660 return woken_wake_function(wait, mode, flags, key);
7661 }
7662
7663 static int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7664 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7665 {
7666 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7667 struct nfs_server *server = NFS_SERVER(state->inode);
7668 struct nfs_client *clp = server->nfs_client;
7669 wait_queue_head_t *q = &clp->cl_lock_waitq;
7670 struct nfs4_lock_waiter waiter = {
7671 .inode = state->inode,
7672 .owner = { .clientid = clp->cl_clientid,
7673 .id = lsp->ls_seqid.owner_id,
7674 .s_dev = server->s_dev },
7675 };
7676 int status;
7677
7678 /* Don't bother with waitqueue if we don't expect a callback */
7679 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7680 return nfs4_retry_setlk_simple(state, cmd, request);
7681
7682 init_wait(&waiter.wait);
7683 waiter.wait.func = nfs4_wake_lock_waiter;
7684 add_wait_queue(q, &waiter.wait);
7685
7686 do {
7687 status = nfs4_proc_setlk(state, cmd, request);
7688 if (status != -EAGAIN || IS_SETLK(cmd))
7689 break;
7690
7691 status = -ERESTARTSYS;
7692 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7693 NFS4_LOCK_MAXTIMEOUT);
7694 } while (!signalled());
7695
7696 remove_wait_queue(q, &waiter.wait);
7697
7698 return status;
7699 }
7700
7701 static int
nfs4_proc_lock(struct file * filp,int cmd,struct file_lock * request)7702 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7703 {
7704 struct nfs_open_context *ctx;
7705 struct nfs4_state *state;
7706 int status;
7707
7708 /* verify open state */
7709 ctx = nfs_file_open_context(filp);
7710 state = ctx->state;
7711
7712 if (IS_GETLK(cmd)) {
7713 if (state != NULL)
7714 return nfs4_proc_getlk(state, F_GETLK, request);
7715 return 0;
7716 }
7717
7718 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7719 return -EINVAL;
7720
7721 if (lock_is_unlock(request)) {
7722 if (state != NULL)
7723 return nfs4_proc_unlck(state, cmd, request);
7724 return 0;
7725 }
7726
7727 if (state == NULL)
7728 return -ENOLCK;
7729
7730 if ((request->c.flc_flags & FL_POSIX) &&
7731 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7732 return -ENOLCK;
7733
7734 /*
7735 * Don't rely on the VFS having checked the file open mode,
7736 * since it won't do this for flock() locks.
7737 */
7738 switch (request->c.flc_type) {
7739 case F_RDLCK:
7740 if (!(filp->f_mode & FMODE_READ))
7741 return -EBADF;
7742 break;
7743 case F_WRLCK:
7744 if (!(filp->f_mode & FMODE_WRITE))
7745 return -EBADF;
7746 }
7747
7748 status = nfs4_set_lock_state(state, request);
7749 if (status != 0)
7750 return status;
7751
7752 return nfs4_retry_setlk(state, cmd, request);
7753 }
7754
nfs4_delete_lease(struct file * file,void ** priv)7755 static int nfs4_delete_lease(struct file *file, void **priv)
7756 {
7757 return generic_setlease(file, F_UNLCK, NULL, priv);
7758 }
7759
nfs4_add_lease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7760 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease,
7761 void **priv)
7762 {
7763 struct inode *inode = file_inode(file);
7764 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7765 int ret;
7766
7767 /* No delegation, no lease */
7768 if (!nfs4_have_delegation(inode, type, 0))
7769 return -EAGAIN;
7770 ret = generic_setlease(file, arg, lease, priv);
7771 if (ret || nfs4_have_delegation(inode, type, 0))
7772 return ret;
7773 /* We raced with a delegation return */
7774 nfs4_delete_lease(file, priv);
7775 return -EAGAIN;
7776 }
7777
nfs4_proc_setlease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7778 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease,
7779 void **priv)
7780 {
7781 switch (arg) {
7782 case F_RDLCK:
7783 case F_WRLCK:
7784 return nfs4_add_lease(file, arg, lease, priv);
7785 case F_UNLCK:
7786 return nfs4_delete_lease(file, priv);
7787 default:
7788 return -EINVAL;
7789 }
7790 }
7791
nfs4_lock_delegation_recall(struct file_lock * fl,struct nfs4_state * state,const nfs4_stateid * stateid)7792 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7793 {
7794 struct nfs_server *server = NFS_SERVER(state->inode);
7795 int err;
7796
7797 err = nfs4_set_lock_state(state, fl);
7798 if (err != 0)
7799 return err;
7800 do {
7801 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7802 if (err != -NFS4ERR_DELAY && err != -NFS4ERR_GRACE)
7803 break;
7804 ssleep(1);
7805 } while (err == -NFS4ERR_DELAY || err == -NFSERR_GRACE);
7806 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7807 }
7808
7809 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7810
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)7811 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7812 struct mnt_idmap *idmap,
7813 struct dentry *unused, struct inode *inode,
7814 const char *key, const void *buf,
7815 size_t buflen, int flags)
7816 {
7817 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7818 }
7819
nfs4_xattr_get_nfs4_acl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7820 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7821 struct dentry *unused, struct inode *inode,
7822 const char *key, void *buf, size_t buflen)
7823 {
7824 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7825 }
7826
nfs4_xattr_list_nfs4_acl(struct dentry * dentry)7827 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7828 {
7829 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7830 }
7831
7832 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7833
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)7834 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7835 struct mnt_idmap *idmap,
7836 struct dentry *unused, struct inode *inode,
7837 const char *key, const void *buf,
7838 size_t buflen, int flags)
7839 {
7840 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7841 }
7842
nfs4_xattr_get_nfs4_dacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7843 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7844 struct dentry *unused, struct inode *inode,
7845 const char *key, void *buf, size_t buflen)
7846 {
7847 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7848 }
7849
nfs4_xattr_list_nfs4_dacl(struct dentry * dentry)7850 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7851 {
7852 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7853 }
7854
7855 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7856
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)7857 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7858 struct mnt_idmap *idmap,
7859 struct dentry *unused, struct inode *inode,
7860 const char *key, const void *buf,
7861 size_t buflen, int flags)
7862 {
7863 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7864 }
7865
nfs4_xattr_get_nfs4_sacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7866 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7867 struct dentry *unused, struct inode *inode,
7868 const char *key, void *buf, size_t buflen)
7869 {
7870 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7871 }
7872
nfs4_xattr_list_nfs4_sacl(struct dentry * dentry)7873 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7874 {
7875 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7876 }
7877
7878 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7879
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)7880 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7881 struct mnt_idmap *idmap,
7882 struct dentry *unused, struct inode *inode,
7883 const char *key, const void *buf,
7884 size_t buflen, int flags)
7885 {
7886 if (security_ismaclabel(key))
7887 return nfs4_set_security_label(inode, buf, buflen);
7888
7889 return -EOPNOTSUPP;
7890 }
7891
nfs4_xattr_get_nfs4_label(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7892 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7893 struct dentry *unused, struct inode *inode,
7894 const char *key, void *buf, size_t buflen)
7895 {
7896 if (security_ismaclabel(key))
7897 return nfs4_get_security_label(inode, buf, buflen);
7898 return -EOPNOTSUPP;
7899 }
7900
7901 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7902 .prefix = XATTR_SECURITY_PREFIX,
7903 .get = nfs4_xattr_get_nfs4_label,
7904 .set = nfs4_xattr_set_nfs4_label,
7905 };
7906
7907 #endif
7908
7909 #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)7910 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7911 struct mnt_idmap *idmap,
7912 struct dentry *unused, struct inode *inode,
7913 const char *key, const void *buf,
7914 size_t buflen, int flags)
7915 {
7916 u32 mask;
7917 int ret;
7918
7919 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7920 return -EOPNOTSUPP;
7921
7922 /*
7923 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7924 * flags right now. Handling of xattr operations use the normal
7925 * file read/write permissions.
7926 *
7927 * Just in case the server has other ideas (which RFC 8276 allows),
7928 * do a cached access check for the XA* flags to possibly avoid
7929 * doing an RPC and getting EACCES back.
7930 */
7931 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7932 if (!(mask & NFS_ACCESS_XAWRITE))
7933 return -EACCES;
7934 }
7935
7936 if (buf == NULL) {
7937 ret = nfs42_proc_removexattr(inode, key);
7938 if (!ret)
7939 nfs4_xattr_cache_remove(inode, key);
7940 } else {
7941 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7942 if (!ret)
7943 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7944 }
7945
7946 return ret;
7947 }
7948
nfs4_xattr_get_nfs4_user(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_user(const struct xattr_handler *handler,
7950 struct dentry *unused, struct inode *inode,
7951 const char *key, void *buf, size_t buflen)
7952 {
7953 u32 mask;
7954 ssize_t ret;
7955
7956 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7957 return -EOPNOTSUPP;
7958
7959 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7960 if (!(mask & NFS_ACCESS_XAREAD))
7961 return -EACCES;
7962 }
7963
7964 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7965 if (ret)
7966 return ret;
7967
7968 ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7969 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7970 return ret;
7971
7972 ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7973
7974 return ret;
7975 }
7976
7977 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)7978 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7979 {
7980 u64 cookie;
7981 bool eof;
7982 ssize_t ret, size;
7983 char *buf;
7984 size_t buflen;
7985 u32 mask;
7986
7987 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7988 return 0;
7989
7990 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7991 if (!(mask & NFS_ACCESS_XALIST))
7992 return 0;
7993 }
7994
7995 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7996 if (ret)
7997 return ret;
7998
7999 ret = nfs4_xattr_cache_list(inode, list, list_len);
8000 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8001 return ret;
8002
8003 cookie = 0;
8004 eof = false;
8005 buflen = list_len ? list_len : XATTR_LIST_MAX;
8006 buf = list_len ? list : NULL;
8007 size = 0;
8008
8009 while (!eof) {
8010 ret = nfs42_proc_listxattrs(inode, buf, buflen,
8011 &cookie, &eof);
8012 if (ret < 0)
8013 return ret;
8014
8015 if (list_len) {
8016 buf += ret;
8017 buflen -= ret;
8018 }
8019 size += ret;
8020 }
8021
8022 if (list_len)
8023 nfs4_xattr_cache_set_list(inode, list, size);
8024
8025 return size;
8026 }
8027
8028 #else
8029
8030 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8031 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8032 {
8033 return 0;
8034 }
8035 #endif /* CONFIG_NFS_V4_2 */
8036
8037 /*
8038 * nfs_fhget will use either the mounted_on_fileid or the fileid
8039 */
nfs_fixup_referral_attributes(struct nfs_fattr * fattr)8040 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
8041 {
8042 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
8043 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
8044 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
8045 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
8046 return;
8047
8048 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
8049 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
8050 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
8051 fattr->nlink = 2;
8052 }
8053
_nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8054 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8055 const struct qstr *name,
8056 struct nfs4_fs_locations *fs_locations,
8057 struct page *page)
8058 {
8059 struct nfs_server *server = NFS_SERVER(dir);
8060 u32 bitmask[3];
8061 struct nfs4_fs_locations_arg args = {
8062 .dir_fh = NFS_FH(dir),
8063 .name = name,
8064 .page = page,
8065 .bitmask = bitmask,
8066 };
8067 struct nfs4_fs_locations_res res = {
8068 .fs_locations = fs_locations,
8069 };
8070 struct rpc_message msg = {
8071 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8072 .rpc_argp = &args,
8073 .rpc_resp = &res,
8074 };
8075 int status;
8076
8077 dprintk("%s: start\n", __func__);
8078
8079 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8080 bitmask[1] = nfs4_fattr_bitmap[1];
8081
8082 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8083 * is not supported */
8084 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8085 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8086 else
8087 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8088
8089 nfs_fattr_init(fs_locations->fattr);
8090 fs_locations->server = server;
8091 fs_locations->nlocations = 0;
8092 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8093 dprintk("%s: returned status = %d\n", __func__, status);
8094 return status;
8095 }
8096
nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8097 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8098 const struct qstr *name,
8099 struct nfs4_fs_locations *fs_locations,
8100 struct page *page)
8101 {
8102 struct nfs4_exception exception = {
8103 .interruptible = true,
8104 };
8105 int err;
8106 do {
8107 err = _nfs4_proc_fs_locations(client, dir, name,
8108 fs_locations, page);
8109 trace_nfs4_get_fs_locations(dir, name, err);
8110 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8111 &exception);
8112 } while (exception.retry);
8113 return err;
8114 }
8115
8116 /*
8117 * This operation also signals the server that this client is
8118 * performing migration recovery. The server can stop asserting
8119 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
8120 * performing this operation is identified in the SEQUENCE
8121 * operation in this compound.
8122 *
8123 * When the client supports GETATTR(fs_locations_info), it can
8124 * be plumbed in here.
8125 */
_nfs41_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8126 static int _nfs41_proc_get_locations(struct nfs_server *server,
8127 struct nfs_fh *fhandle,
8128 struct nfs4_fs_locations *locations,
8129 struct page *page, const struct cred *cred)
8130 {
8131 struct rpc_clnt *clnt = server->client;
8132 struct nfs_client *clp = server->nfs_client;
8133 u32 bitmask[2] = {
8134 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8135 };
8136 struct nfs4_fs_locations_arg args = {
8137 .fh = fhandle,
8138 .page = page,
8139 .bitmask = bitmask,
8140 .migration = 1, /* skip LOOKUP */
8141 };
8142 struct nfs4_fs_locations_res res = {
8143 .fs_locations = locations,
8144 .migration = 1,
8145 };
8146 struct rpc_message msg = {
8147 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8148 .rpc_argp = &args,
8149 .rpc_resp = &res,
8150 .rpc_cred = cred,
8151 };
8152 struct nfs4_call_sync_data data = {
8153 .seq_server = server,
8154 .seq_args = &args.seq_args,
8155 .seq_res = &res.seq_res,
8156 };
8157 struct rpc_task_setup task_setup_data = {
8158 .rpc_client = clnt,
8159 .rpc_message = &msg,
8160 .callback_ops = clp->cl_mvops->call_sync_ops,
8161 .callback_data = &data,
8162 .flags = RPC_TASK_NO_ROUND_ROBIN,
8163 };
8164 int status;
8165
8166 nfs_fattr_init(locations->fattr);
8167 locations->server = server;
8168 locations->nlocations = 0;
8169
8170 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 1);
8171 status = nfs4_call_sync_custom(&task_setup_data);
8172 if (status == NFS4_OK &&
8173 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8174 status = -NFS4ERR_LEASE_MOVED;
8175 return status;
8176 }
8177
8178 /**
8179 * nfs4_proc_get_locations - discover locations for a migrated FSID
8180 * @server: pointer to nfs_server to process
8181 * @fhandle: pointer to the kernel NFS client file handle
8182 * @locations: result of query
8183 * @page: buffer
8184 * @cred: credential to use for this operation
8185 *
8186 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8187 * operation failed, or a negative errno if a local error occurred.
8188 *
8189 * On success, "locations" is filled in, but if the server has
8190 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8191 * asserted.
8192 *
8193 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8194 * from this client that require migration recovery.
8195 */
nfs4_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8196 int nfs4_proc_get_locations(struct nfs_server *server,
8197 struct nfs_fh *fhandle,
8198 struct nfs4_fs_locations *locations,
8199 struct page *page, const struct cred *cred)
8200 {
8201 struct nfs_client *clp = server->nfs_client;
8202 const struct nfs4_mig_recovery_ops *ops =
8203 clp->cl_mvops->mig_recovery_ops;
8204 struct nfs4_exception exception = {
8205 .interruptible = true,
8206 };
8207 int status;
8208
8209 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8210 (unsigned long long)server->fsid.major,
8211 (unsigned long long)server->fsid.minor,
8212 clp->cl_hostname);
8213 nfs_display_fhandle(fhandle, __func__);
8214
8215 do {
8216 status = ops->get_locations(server, fhandle, locations, page,
8217 cred);
8218 if (status != -NFS4ERR_DELAY)
8219 break;
8220 nfs4_handle_exception(server, status, &exception);
8221 } while (exception.retry);
8222 return status;
8223 }
8224
8225 /*
8226 * This operation also signals the server that this client is
8227 * performing "lease moved" recovery. The server can stop asserting
8228 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
8229 * this operation is identified in the SEQUENCE operation in this
8230 * compound.
8231 */
_nfs41_proc_fsid_present(struct inode * inode,const struct cred * cred)8232 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8233 {
8234 struct nfs_server *server = NFS_SERVER(inode);
8235 struct rpc_clnt *clnt = server->client;
8236 struct nfs4_fsid_present_arg args = {
8237 .fh = NFS_FH(inode),
8238 };
8239 struct nfs4_fsid_present_res res = {
8240 };
8241 struct rpc_message msg = {
8242 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8243 .rpc_argp = &args,
8244 .rpc_resp = &res,
8245 .rpc_cred = cred,
8246 };
8247 int status;
8248
8249 res.fh = nfs_alloc_fhandle();
8250 if (res.fh == NULL)
8251 return -ENOMEM;
8252
8253 nfs4_init_sequence(server->nfs_client, &args.seq_args, &res.seq_res, 0, 1);
8254 status = nfs4_call_sync_sequence(clnt, server, &msg,
8255 &args.seq_args, &res.seq_res);
8256 nfs_free_fhandle(res.fh);
8257 if (status == NFS4_OK &&
8258 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8259 status = -NFS4ERR_LEASE_MOVED;
8260 return status;
8261 }
8262
8263 /**
8264 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8265 * @inode: inode on FSID to check
8266 * @cred: credential to use for this operation
8267 *
8268 * Server indicates whether the FSID is present, moved, or not
8269 * recognized. This operation is necessary to clear a LEASE_MOVED
8270 * condition for this client ID.
8271 *
8272 * Returns NFS4_OK if the FSID is present on this server,
8273 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8274 * NFS4ERR code if some error occurred on the server, or a
8275 * negative errno if a local failure occurred.
8276 */
nfs4_proc_fsid_present(struct inode * inode,const struct cred * cred)8277 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8278 {
8279 struct nfs_server *server = NFS_SERVER(inode);
8280 struct nfs_client *clp = server->nfs_client;
8281 const struct nfs4_mig_recovery_ops *ops =
8282 clp->cl_mvops->mig_recovery_ops;
8283 struct nfs4_exception exception = {
8284 .interruptible = true,
8285 };
8286 int status;
8287
8288 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8289 (unsigned long long)server->fsid.major,
8290 (unsigned long long)server->fsid.minor,
8291 clp->cl_hostname);
8292 nfs_display_fhandle(NFS_FH(inode), __func__);
8293
8294 do {
8295 status = ops->fsid_present(inode, cred);
8296 if (status != -NFS4ERR_DELAY)
8297 break;
8298 nfs4_handle_exception(server, status, &exception);
8299 } while (exception.retry);
8300 return status;
8301 }
8302
8303 /*
8304 * If 'use_integrity' is true and the state managment nfs_client
8305 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8306 * and the machine credential as per RFC3530bis and RFC5661 Security
8307 * Considerations sections. Otherwise, just use the user cred with the
8308 * filesystem's rpc_client.
8309 */
_nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors,bool use_integrity)8310 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8311 {
8312 int status;
8313 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8314 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8315 struct nfs4_secinfo_arg args = {
8316 .dir_fh = NFS_FH(dir),
8317 .name = name,
8318 };
8319 struct nfs4_secinfo_res res = {
8320 .flavors = flavors,
8321 };
8322 struct rpc_message msg = {
8323 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8324 .rpc_argp = &args,
8325 .rpc_resp = &res,
8326 };
8327 struct nfs4_call_sync_data data = {
8328 .seq_server = NFS_SERVER(dir),
8329 .seq_args = &args.seq_args,
8330 .seq_res = &res.seq_res,
8331 };
8332 struct rpc_task_setup task_setup = {
8333 .rpc_client = clnt,
8334 .rpc_message = &msg,
8335 .callback_ops = clp->cl_mvops->call_sync_ops,
8336 .callback_data = &data,
8337 .flags = RPC_TASK_NO_ROUND_ROBIN,
8338 };
8339 const struct cred *cred = NULL;
8340
8341 if (use_integrity) {
8342 clnt = clp->cl_rpcclient;
8343 task_setup.rpc_client = clnt;
8344
8345 cred = nfs4_get_clid_cred(clp);
8346 msg.rpc_cred = cred;
8347 }
8348
8349 dprintk("NFS call secinfo %s\n", name->name);
8350
8351 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8352 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 0);
8353 status = nfs4_call_sync_custom(&task_setup);
8354
8355 dprintk("NFS reply secinfo: %d\n", status);
8356
8357 put_cred(cred);
8358 return status;
8359 }
8360
nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors)8361 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8362 struct nfs4_secinfo_flavors *flavors)
8363 {
8364 struct nfs4_exception exception = {
8365 .interruptible = true,
8366 };
8367 int err;
8368 do {
8369 err = -NFS4ERR_WRONGSEC;
8370
8371 /* try to use integrity protection with machine cred */
8372 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8373 err = _nfs4_proc_secinfo(dir, name, flavors, true);
8374
8375 /*
8376 * if unable to use integrity protection, or SECINFO with
8377 * integrity protection returns NFS4ERR_WRONGSEC (which is
8378 * disallowed by spec, but exists in deployed servers) use
8379 * the current filesystem's rpc_client and the user cred.
8380 */
8381 if (err == -NFS4ERR_WRONGSEC)
8382 err = _nfs4_proc_secinfo(dir, name, flavors, false);
8383
8384 trace_nfs4_secinfo(dir, name, err);
8385 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8386 &exception);
8387 } while (exception.retry);
8388 return err;
8389 }
8390
8391 /*
8392 * Check the exchange flags returned by the server for invalid flags, having
8393 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8394 * DS flags set.
8395 */
nfs4_check_cl_exchange_flags(u32 flags,u32 version)8396 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8397 {
8398 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8399 goto out_inval;
8400 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8401 goto out_inval;
8402 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8403 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8404 goto out_inval;
8405 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8406 goto out_inval;
8407 return NFS_OK;
8408 out_inval:
8409 return -NFS4ERR_INVAL;
8410 }
8411
8412 static bool
nfs41_same_server_scope(struct nfs41_server_scope * a,struct nfs41_server_scope * b)8413 nfs41_same_server_scope(struct nfs41_server_scope *a,
8414 struct nfs41_server_scope *b)
8415 {
8416 if (a->server_scope_sz != b->server_scope_sz)
8417 return false;
8418 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8419 }
8420
8421 static void
nfs4_bind_one_conn_to_session_done(struct rpc_task * task,void * calldata)8422 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8423 {
8424 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8425 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8426 struct nfs_client *clp = args->client;
8427
8428 switch (task->tk_status) {
8429 case -NFS4ERR_BADSESSION:
8430 case -NFS4ERR_DEADSESSION:
8431 nfs4_schedule_session_recovery(clp->cl_session,
8432 task->tk_status);
8433 return;
8434 }
8435 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8436 res->dir != NFS4_CDFS4_BOTH) {
8437 rpc_task_close_connection(task);
8438 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8439 rpc_restart_call(task);
8440 }
8441 }
8442
8443 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8444 .rpc_call_done = nfs4_bind_one_conn_to_session_done,
8445 };
8446
8447 /*
8448 * nfs4_proc_bind_one_conn_to_session()
8449 *
8450 * The 4.1 client currently uses the same TCP connection for the
8451 * fore and backchannel.
8452 */
8453 static
nfs4_proc_bind_one_conn_to_session(struct rpc_clnt * clnt,struct rpc_xprt * xprt,struct nfs_client * clp,const struct cred * cred)8454 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8455 struct rpc_xprt *xprt,
8456 struct nfs_client *clp,
8457 const struct cred *cred)
8458 {
8459 int status;
8460 struct nfs41_bind_conn_to_session_args args = {
8461 .client = clp,
8462 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8463 .retries = 0,
8464 };
8465 struct nfs41_bind_conn_to_session_res res;
8466 struct rpc_message msg = {
8467 .rpc_proc =
8468 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8469 .rpc_argp = &args,
8470 .rpc_resp = &res,
8471 .rpc_cred = cred,
8472 };
8473 struct rpc_task_setup task_setup_data = {
8474 .rpc_client = clnt,
8475 .rpc_xprt = xprt,
8476 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8477 .rpc_message = &msg,
8478 .flags = RPC_TASK_TIMEOUT,
8479 };
8480 struct rpc_task *task;
8481
8482 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8483 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8484 args.dir = NFS4_CDFC4_FORE;
8485
8486 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8487 if (xprt != rcu_access_pointer(clnt->cl_xprt))
8488 args.dir = NFS4_CDFC4_FORE;
8489
8490 task = rpc_run_task(&task_setup_data);
8491 if (!IS_ERR(task)) {
8492 status = task->tk_status;
8493 rpc_put_task(task);
8494 } else
8495 status = PTR_ERR(task);
8496 trace_nfs4_bind_conn_to_session(clp, status);
8497 if (status == 0) {
8498 if (memcmp(res.sessionid.data,
8499 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8500 dprintk("NFS: %s: Session ID mismatch\n", __func__);
8501 return -EIO;
8502 }
8503 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8504 dprintk("NFS: %s: Unexpected direction from server\n",
8505 __func__);
8506 return -EIO;
8507 }
8508 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8509 dprintk("NFS: %s: Server returned RDMA mode = true\n",
8510 __func__);
8511 return -EIO;
8512 }
8513 }
8514
8515 return status;
8516 }
8517
8518 struct rpc_bind_conn_calldata {
8519 struct nfs_client *clp;
8520 const struct cred *cred;
8521 };
8522
8523 static int
nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * calldata)8524 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8525 struct rpc_xprt *xprt,
8526 void *calldata)
8527 {
8528 struct rpc_bind_conn_calldata *p = calldata;
8529
8530 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8531 }
8532
nfs4_proc_bind_conn_to_session(struct nfs_client * clp,const struct cred * cred)8533 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8534 {
8535 struct rpc_bind_conn_calldata data = {
8536 .clp = clp,
8537 .cred = cred,
8538 };
8539 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8540 nfs4_proc_bind_conn_to_session_callback, &data);
8541 }
8542
8543 /*
8544 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8545 * and operations we'd like to see to enable certain features in the allow map
8546 */
8547 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8548 .how = SP4_MACH_CRED,
8549 .enforce.u.words = {
8550 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8551 1 << (OP_EXCHANGE_ID - 32) |
8552 1 << (OP_CREATE_SESSION - 32) |
8553 1 << (OP_DESTROY_SESSION - 32) |
8554 1 << (OP_DESTROY_CLIENTID - 32)
8555 },
8556 .allow.u.words = {
8557 [0] = 1 << (OP_CLOSE) |
8558 1 << (OP_OPEN_DOWNGRADE) |
8559 1 << (OP_LOCKU) |
8560 1 << (OP_DELEGRETURN) |
8561 1 << (OP_COMMIT),
8562 [1] = 1 << (OP_SECINFO - 32) |
8563 1 << (OP_SECINFO_NO_NAME - 32) |
8564 1 << (OP_LAYOUTRETURN - 32) |
8565 1 << (OP_TEST_STATEID - 32) |
8566 1 << (OP_FREE_STATEID - 32) |
8567 1 << (OP_WRITE - 32)
8568 }
8569 };
8570
8571 /*
8572 * Select the state protection mode for client `clp' given the server results
8573 * from exchange_id in `sp'.
8574 *
8575 * Returns 0 on success, negative errno otherwise.
8576 */
nfs4_sp4_select_mode(struct nfs_client * clp,struct nfs41_state_protection * sp)8577 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8578 struct nfs41_state_protection *sp)
8579 {
8580 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8581 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8582 1 << (OP_EXCHANGE_ID - 32) |
8583 1 << (OP_CREATE_SESSION - 32) |
8584 1 << (OP_DESTROY_SESSION - 32) |
8585 1 << (OP_DESTROY_CLIENTID - 32)
8586 };
8587 unsigned long flags = 0;
8588 unsigned int i;
8589 int ret = 0;
8590
8591 if (sp->how == SP4_MACH_CRED) {
8592 /* Print state protect result */
8593 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8594 for (i = 0; i <= LAST_NFS4_OP; i++) {
8595 if (test_bit(i, sp->enforce.u.longs))
8596 dfprintk(MOUNT, " enforce op %d\n", i);
8597 if (test_bit(i, sp->allow.u.longs))
8598 dfprintk(MOUNT, " allow op %d\n", i);
8599 }
8600
8601 /* make sure nothing is on enforce list that isn't supported */
8602 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8603 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8604 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8605 ret = -EINVAL;
8606 goto out;
8607 }
8608 }
8609
8610 /*
8611 * Minimal mode - state operations are allowed to use machine
8612 * credential. Note this already happens by default, so the
8613 * client doesn't have to do anything more than the negotiation.
8614 *
8615 * NOTE: we don't care if EXCHANGE_ID is in the list -
8616 * we're already using the machine cred for exchange_id
8617 * and will never use a different cred.
8618 */
8619 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8620 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8621 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8622 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8623 dfprintk(MOUNT, "sp4_mach_cred:\n");
8624 dfprintk(MOUNT, " minimal mode enabled\n");
8625 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8626 } else {
8627 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8628 ret = -EINVAL;
8629 goto out;
8630 }
8631
8632 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8633 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8634 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8635 test_bit(OP_LOCKU, sp->allow.u.longs)) {
8636 dfprintk(MOUNT, " cleanup mode enabled\n");
8637 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8638 }
8639
8640 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8641 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
8642 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8643 }
8644
8645 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8646 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8647 dfprintk(MOUNT, " secinfo mode enabled\n");
8648 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8649 }
8650
8651 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8652 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8653 dfprintk(MOUNT, " stateid mode enabled\n");
8654 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8655 }
8656
8657 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8658 dfprintk(MOUNT, " write mode enabled\n");
8659 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8660 }
8661
8662 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8663 dfprintk(MOUNT, " commit mode enabled\n");
8664 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8665 }
8666 }
8667 out:
8668 clp->cl_sp4_flags = flags;
8669 return ret;
8670 }
8671
8672 struct nfs41_exchange_id_data {
8673 struct nfs41_exchange_id_res res;
8674 struct nfs41_exchange_id_args args;
8675 };
8676
nfs4_exchange_id_release(void * data)8677 static void nfs4_exchange_id_release(void *data)
8678 {
8679 struct nfs41_exchange_id_data *cdata =
8680 (struct nfs41_exchange_id_data *)data;
8681
8682 nfs_put_client(cdata->args.client);
8683 kfree(cdata->res.impl_id);
8684 kfree(cdata->res.server_scope);
8685 kfree(cdata->res.server_owner);
8686 kfree(cdata);
8687 }
8688
8689 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8690 .rpc_release = nfs4_exchange_id_release,
8691 };
8692
8693 /*
8694 * _nfs4_proc_exchange_id()
8695 *
8696 * Wrapper for EXCHANGE_ID operation.
8697 */
8698 static struct rpc_task *
nfs4_run_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how,struct rpc_xprt * xprt)8699 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8700 u32 sp4_how, struct rpc_xprt *xprt)
8701 {
8702 struct rpc_message msg = {
8703 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8704 .rpc_cred = cred,
8705 };
8706 struct rpc_task_setup task_setup_data = {
8707 .rpc_client = clp->cl_rpcclient,
8708 .callback_ops = &nfs4_exchange_id_call_ops,
8709 .rpc_message = &msg,
8710 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8711 };
8712 struct nfs41_exchange_id_data *calldata;
8713 int status;
8714
8715 if (!refcount_inc_not_zero(&clp->cl_count))
8716 return ERR_PTR(-EIO);
8717
8718 status = -ENOMEM;
8719 calldata = kzalloc_obj(*calldata, GFP_NOFS);
8720 if (!calldata)
8721 goto out;
8722
8723 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8724
8725 status = nfs4_init_uniform_client_string(clp);
8726 if (status)
8727 goto out_calldata;
8728
8729 calldata->res.server_owner = kzalloc_obj(struct nfs41_server_owner,
8730 GFP_NOFS);
8731 status = -ENOMEM;
8732 if (unlikely(calldata->res.server_owner == NULL))
8733 goto out_calldata;
8734
8735 calldata->res.server_scope = kzalloc_obj(struct nfs41_server_scope,
8736 GFP_NOFS);
8737 if (unlikely(calldata->res.server_scope == NULL))
8738 goto out_server_owner;
8739
8740 calldata->res.impl_id = kzalloc_obj(struct nfs41_impl_id, GFP_NOFS);
8741 if (unlikely(calldata->res.impl_id == NULL))
8742 goto out_server_scope;
8743
8744 switch (sp4_how) {
8745 case SP4_NONE:
8746 calldata->args.state_protect.how = SP4_NONE;
8747 break;
8748
8749 case SP4_MACH_CRED:
8750 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8751 break;
8752
8753 default:
8754 /* unsupported! */
8755 WARN_ON_ONCE(1);
8756 status = -EINVAL;
8757 goto out_impl_id;
8758 }
8759 if (xprt) {
8760 task_setup_data.rpc_xprt = xprt;
8761 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8762 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8763 sizeof(calldata->args.verifier.data));
8764 }
8765 calldata->args.client = clp;
8766 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8767 EXCHGID4_FLAG_BIND_PRINC_STATEID;
8768 #ifdef CONFIG_NFS_V4_1_MIGRATION
8769 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8770 #endif
8771 if (test_bit(NFS_CS_PNFS, &clp->cl_flags))
8772 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8773 msg.rpc_argp = &calldata->args;
8774 msg.rpc_resp = &calldata->res;
8775 task_setup_data.callback_data = calldata;
8776
8777 return rpc_run_task(&task_setup_data);
8778
8779 out_impl_id:
8780 kfree(calldata->res.impl_id);
8781 out_server_scope:
8782 kfree(calldata->res.server_scope);
8783 out_server_owner:
8784 kfree(calldata->res.server_owner);
8785 out_calldata:
8786 kfree(calldata);
8787 out:
8788 nfs_put_client(clp);
8789 return ERR_PTR(status);
8790 }
8791
8792 /*
8793 * _nfs4_proc_exchange_id()
8794 *
8795 * Wrapper for EXCHANGE_ID operation.
8796 */
_nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how)8797 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8798 u32 sp4_how)
8799 {
8800 struct rpc_task *task;
8801 struct nfs41_exchange_id_args *argp;
8802 struct nfs41_exchange_id_res *resp;
8803 unsigned long now = jiffies;
8804 int status;
8805
8806 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8807 if (IS_ERR(task))
8808 return PTR_ERR(task);
8809
8810 argp = task->tk_msg.rpc_argp;
8811 resp = task->tk_msg.rpc_resp;
8812 status = task->tk_status;
8813 if (status != 0)
8814 goto out;
8815
8816 status = nfs4_check_cl_exchange_flags(resp->flags,
8817 clp->cl_mvops->minor_version);
8818 if (status != 0)
8819 goto out;
8820
8821 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8822 if (status != 0)
8823 goto out;
8824
8825 do_renew_lease(clp, now);
8826
8827 clp->cl_clientid = resp->clientid;
8828 clp->cl_exchange_flags = resp->flags;
8829 clp->cl_seqid = resp->seqid;
8830 /* Client ID is not confirmed */
8831 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8832 clear_bit(NFS4_SESSION_ESTABLISHED,
8833 &clp->cl_session->session_state);
8834
8835 if (clp->cl_serverscope != NULL &&
8836 !nfs41_same_server_scope(clp->cl_serverscope,
8837 resp->server_scope)) {
8838 dprintk("%s: server_scope mismatch detected\n",
8839 __func__);
8840 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8841 }
8842
8843 swap(clp->cl_serverowner, resp->server_owner);
8844 swap(clp->cl_serverscope, resp->server_scope);
8845 swap(clp->cl_implid, resp->impl_id);
8846
8847 /* Save the EXCHANGE_ID verifier session trunk tests */
8848 memcpy(clp->cl_confirm.data, argp->verifier.data,
8849 sizeof(clp->cl_confirm.data));
8850 out:
8851 trace_nfs4_exchange_id(clp, status);
8852 rpc_put_task(task);
8853 return status;
8854 }
8855
8856 /*
8857 * nfs4_proc_exchange_id()
8858 *
8859 * Returns zero, a negative errno, or a negative NFS4ERR status code.
8860 *
8861 * Since the clientid has expired, all compounds using sessions
8862 * associated with the stale clientid will be returning
8863 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8864 * be in some phase of session reset.
8865 *
8866 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8867 */
nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred)8868 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8869 {
8870 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8871 int status;
8872
8873 /* try SP4_MACH_CRED if krb5i/p */
8874 if (authflavor == RPC_AUTH_GSS_KRB5I ||
8875 authflavor == RPC_AUTH_GSS_KRB5P) {
8876 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8877 if (!status)
8878 return 0;
8879 }
8880
8881 /* try SP4_NONE */
8882 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8883 }
8884
8885 /**
8886 * nfs4_test_session_trunk
8887 *
8888 * This is an add_xprt_test() test function called from
8889 * rpc_clnt_setup_test_and_add_xprt.
8890 *
8891 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8892 * and is dereferrenced in nfs4_exchange_id_release
8893 *
8894 * Upon success, add the new transport to the rpc_clnt
8895 *
8896 * @clnt: struct rpc_clnt to get new transport
8897 * @xprt: the rpc_xprt to test
8898 * @data: call data for _nfs4_proc_exchange_id.
8899 */
nfs4_test_session_trunk(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * data)8900 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8901 void *data)
8902 {
8903 struct nfs4_add_xprt_data *adata = data;
8904 struct rpc_task *task;
8905 int status;
8906
8907 u32 sp4_how;
8908
8909 dprintk("--> %s try %s\n", __func__,
8910 xprt->address_strings[RPC_DISPLAY_ADDR]);
8911
8912 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8913
8914 try_again:
8915 /* Test connection for session trunking. Async exchange_id call */
8916 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8917 if (IS_ERR(task))
8918 return;
8919
8920 status = task->tk_status;
8921 if (status == 0) {
8922 status = nfs4_detect_session_trunking(adata->clp,
8923 task->tk_msg.rpc_resp, xprt);
8924 trace_nfs4_trunked_exchange_id(adata->clp,
8925 xprt->address_strings[RPC_DISPLAY_ADDR], status);
8926 }
8927 if (status == 0)
8928 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8929 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
8930 (struct sockaddr *)&xprt->addr))
8931 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8932
8933 rpc_put_task(task);
8934 if (status == -NFS4ERR_DELAY) {
8935 ssleep(1);
8936 goto try_again;
8937 }
8938 }
8939 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8940
_nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)8941 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8942 const struct cred *cred)
8943 {
8944 struct rpc_message msg = {
8945 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8946 .rpc_argp = clp,
8947 .rpc_cred = cred,
8948 };
8949 int status;
8950
8951 status = rpc_call_sync(clp->cl_rpcclient, &msg,
8952 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8953 trace_nfs4_destroy_clientid(clp, status);
8954 if (status)
8955 dprintk("NFS: Got error %d from the server %s on "
8956 "DESTROY_CLIENTID.", status, clp->cl_hostname);
8957 return status;
8958 }
8959
nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)8960 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8961 const struct cred *cred)
8962 {
8963 unsigned int loop;
8964 int ret;
8965
8966 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8967 ret = _nfs4_proc_destroy_clientid(clp, cred);
8968 switch (ret) {
8969 case -NFS4ERR_DELAY:
8970 case -NFS4ERR_CLIENTID_BUSY:
8971 ssleep(1);
8972 break;
8973 default:
8974 return ret;
8975 }
8976 }
8977 return 0;
8978 }
8979
nfs4_destroy_clientid(struct nfs_client * clp)8980 int nfs4_destroy_clientid(struct nfs_client *clp)
8981 {
8982 const struct cred *cred;
8983 int ret = 0;
8984
8985 if (clp->cl_mvops->minor_version < 1)
8986 goto out;
8987 if (clp->cl_exchange_flags == 0)
8988 goto out;
8989 if (clp->cl_preserve_clid)
8990 goto out;
8991 cred = nfs4_get_clid_cred(clp);
8992 ret = nfs4_proc_destroy_clientid(clp, cred);
8993 put_cred(cred);
8994 switch (ret) {
8995 case 0:
8996 case -NFS4ERR_STALE_CLIENTID:
8997 clp->cl_exchange_flags = 0;
8998 }
8999 out:
9000 return ret;
9001 }
9002
9003 struct nfs4_get_lease_time_data {
9004 struct nfs4_get_lease_time_args *args;
9005 struct nfs4_get_lease_time_res *res;
9006 struct nfs_client *clp;
9007 };
9008
nfs4_get_lease_time_prepare(struct rpc_task * task,void * calldata)9009 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9010 void *calldata)
9011 {
9012 struct nfs4_get_lease_time_data *data =
9013 (struct nfs4_get_lease_time_data *)calldata;
9014
9015 /* just setup sequence, do not trigger session recovery
9016 since we're invoked within one */
9017 nfs4_setup_sequence(data->clp,
9018 &data->args->la_seq_args,
9019 &data->res->lr_seq_res,
9020 task);
9021 }
9022
9023 /*
9024 * Called from nfs4_state_manager thread for session setup, so don't recover
9025 * from sequence operation or clientid errors.
9026 */
nfs4_get_lease_time_done(struct rpc_task * task,void * calldata)9027 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9028 {
9029 struct nfs4_get_lease_time_data *data =
9030 (struct nfs4_get_lease_time_data *)calldata;
9031
9032 if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9033 return;
9034 switch (task->tk_status) {
9035 case -NFS4ERR_DELAY:
9036 case -NFS4ERR_GRACE:
9037 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9038 task->tk_status = 0;
9039 fallthrough;
9040 case -NFS4ERR_RETRY_UNCACHED_REP:
9041 rpc_restart_call_prepare(task);
9042 return;
9043 }
9044 }
9045
9046 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9047 .rpc_call_prepare = nfs4_get_lease_time_prepare,
9048 .rpc_call_done = nfs4_get_lease_time_done,
9049 };
9050
nfs4_proc_get_lease_time(struct nfs_client * clp,struct nfs_fsinfo * fsinfo)9051 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9052 {
9053 struct nfs4_get_lease_time_args args;
9054 struct nfs4_get_lease_time_res res = {
9055 .lr_fsinfo = fsinfo,
9056 };
9057 struct nfs4_get_lease_time_data data = {
9058 .args = &args,
9059 .res = &res,
9060 .clp = clp,
9061 };
9062 struct rpc_message msg = {
9063 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9064 .rpc_argp = &args,
9065 .rpc_resp = &res,
9066 };
9067 struct rpc_task_setup task_setup = {
9068 .rpc_client = clp->cl_rpcclient,
9069 .rpc_message = &msg,
9070 .callback_ops = &nfs4_get_lease_time_ops,
9071 .callback_data = &data,
9072 .flags = RPC_TASK_TIMEOUT,
9073 };
9074
9075 nfs4_init_sequence(clp, &args.la_seq_args, &res.lr_seq_res, 0, 1);
9076 return nfs4_call_sync_custom(&task_setup);
9077 }
9078
9079 /*
9080 * Initialize the values to be used by the client in CREATE_SESSION
9081 * If nfs4_init_session set the fore channel request and response sizes,
9082 * use them.
9083 *
9084 * Set the back channel max_resp_sz_cached to zero to force the client to
9085 * always set csa_cachethis to FALSE because the current implementation
9086 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9087 */
nfs4_init_channel_attrs(struct nfs41_create_session_args * args,struct rpc_clnt * clnt)9088 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9089 struct rpc_clnt *clnt)
9090 {
9091 unsigned int max_rqst_sz, max_resp_sz;
9092 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9093 unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9094
9095 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9096 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9097
9098 /* Fore channel attributes */
9099 args->fc_attrs.max_rqst_sz = max_rqst_sz;
9100 args->fc_attrs.max_resp_sz = max_resp_sz;
9101 args->fc_attrs.max_ops = NFS4_MAX_OPS;
9102 args->fc_attrs.max_reqs = max_session_slots;
9103
9104 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9105 "max_ops=%u max_reqs=%u\n",
9106 __func__,
9107 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9108 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9109
9110 /* Back channel attributes */
9111 args->bc_attrs.max_rqst_sz = max_bc_payload;
9112 args->bc_attrs.max_resp_sz = max_bc_payload;
9113 args->bc_attrs.max_resp_sz_cached = 0;
9114 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9115 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9116 if (args->bc_attrs.max_reqs > max_bc_slots)
9117 args->bc_attrs.max_reqs = max_bc_slots;
9118
9119 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9120 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9121 __func__,
9122 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9123 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9124 args->bc_attrs.max_reqs);
9125 }
9126
nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9127 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9128 struct nfs41_create_session_res *res)
9129 {
9130 struct nfs4_channel_attrs *sent = &args->fc_attrs;
9131 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9132
9133 if (rcvd->max_resp_sz > sent->max_resp_sz)
9134 return -EINVAL;
9135 /*
9136 * Our requested max_ops is the minimum we need; we're not
9137 * prepared to break up compounds into smaller pieces than that.
9138 * So, no point even trying to continue if the server won't
9139 * cooperate:
9140 */
9141 if (rcvd->max_ops < sent->max_ops)
9142 return -EINVAL;
9143 if (rcvd->max_reqs == 0)
9144 return -EINVAL;
9145 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9146 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9147 return 0;
9148 }
9149
nfs4_verify_back_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9150 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9151 struct nfs41_create_session_res *res)
9152 {
9153 struct nfs4_channel_attrs *sent = &args->bc_attrs;
9154 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9155
9156 if (!(res->flags & SESSION4_BACK_CHAN))
9157 goto out;
9158 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9159 return -EINVAL;
9160 if (rcvd->max_resp_sz > sent->max_resp_sz)
9161 return -EINVAL;
9162 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9163 return -EINVAL;
9164 if (rcvd->max_ops > sent->max_ops)
9165 return -EINVAL;
9166 if (rcvd->max_reqs > sent->max_reqs)
9167 return -EINVAL;
9168 out:
9169 return 0;
9170 }
9171
nfs4_verify_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9172 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9173 struct nfs41_create_session_res *res)
9174 {
9175 int ret;
9176
9177 ret = nfs4_verify_fore_channel_attrs(args, res);
9178 if (ret)
9179 return ret;
9180 return nfs4_verify_back_channel_attrs(args, res);
9181 }
9182
nfs4_update_session(struct nfs4_session * session,struct nfs41_create_session_res * res)9183 static void nfs4_update_session(struct nfs4_session *session,
9184 struct nfs41_create_session_res *res)
9185 {
9186 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9187 /* Mark client id and session as being confirmed */
9188 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9189 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9190 session->flags = res->flags;
9191 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9192 if (res->flags & SESSION4_BACK_CHAN)
9193 memcpy(&session->bc_attrs, &res->bc_attrs,
9194 sizeof(session->bc_attrs));
9195 }
9196
_nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9197 static int _nfs4_proc_create_session(struct nfs_client *clp,
9198 const struct cred *cred)
9199 {
9200 struct nfs4_session *session = clp->cl_session;
9201 struct nfs41_create_session_args args = {
9202 .client = clp,
9203 .clientid = clp->cl_clientid,
9204 .seqid = clp->cl_seqid,
9205 .cb_program = NFS4_CALLBACK,
9206 };
9207 struct nfs41_create_session_res res;
9208
9209 struct rpc_message msg = {
9210 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9211 .rpc_argp = &args,
9212 .rpc_resp = &res,
9213 .rpc_cred = cred,
9214 };
9215 int status;
9216
9217 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9218 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9219
9220 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9221 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9222 trace_nfs4_create_session(clp, status);
9223
9224 switch (status) {
9225 case -NFS4ERR_STALE_CLIENTID:
9226 case -NFS4ERR_DELAY:
9227 case -ETIMEDOUT:
9228 case -EACCES:
9229 case -EAGAIN:
9230 goto out;
9231 }
9232
9233 clp->cl_seqid++;
9234 if (!status) {
9235 /* Verify the session's negotiated channel_attrs values */
9236 status = nfs4_verify_channel_attrs(&args, &res);
9237 /* Increment the clientid slot sequence id */
9238 if (status)
9239 goto out;
9240 nfs4_update_session(session, &res);
9241 }
9242 out:
9243 return status;
9244 }
9245
9246 /*
9247 * Issues a CREATE_SESSION operation to the server.
9248 * It is the responsibility of the caller to verify the session is
9249 * expired before calling this routine.
9250 */
nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9251 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9252 {
9253 int status;
9254 unsigned *ptr;
9255 struct nfs4_session *session = clp->cl_session;
9256 struct nfs4_add_xprt_data xprtdata = {
9257 .clp = clp,
9258 };
9259 struct rpc_add_xprt_test rpcdata = {
9260 .add_xprt_test = clp->cl_mvops->session_trunk,
9261 .data = &xprtdata,
9262 };
9263
9264 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9265
9266 status = _nfs4_proc_create_session(clp, cred);
9267 if (status)
9268 goto out;
9269
9270 /* Init or reset the session slot tables */
9271 status = nfs4_setup_session_slot_tables(session);
9272 dprintk("slot table setup returned %d\n", status);
9273 if (status)
9274 goto out;
9275
9276 ptr = (unsigned *)&session->sess_id.data[0];
9277 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9278 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9279 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9280 out:
9281 return status;
9282 }
9283
9284 /*
9285 * Issue the over-the-wire RPC DESTROY_SESSION.
9286 * The caller must serialize access to this routine.
9287 */
nfs4_proc_destroy_session(struct nfs4_session * session,const struct cred * cred)9288 int nfs4_proc_destroy_session(struct nfs4_session *session,
9289 const struct cred *cred)
9290 {
9291 struct rpc_message msg = {
9292 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9293 .rpc_argp = session,
9294 .rpc_cred = cred,
9295 };
9296 int status = 0;
9297
9298 /* session is still being setup */
9299 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9300 return 0;
9301
9302 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9303 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9304 trace_nfs4_destroy_session(session->clp, status);
9305
9306 if (status)
9307 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9308 "Session has been destroyed regardless...\n", status);
9309 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9310 return status;
9311 }
9312
9313 /*
9314 * Renew the cl_session lease.
9315 */
9316 struct nfs4_sequence_data {
9317 struct nfs_client *clp;
9318 struct nfs4_sequence_args args;
9319 struct nfs4_sequence_res res;
9320 };
9321
nfs41_sequence_release(void * data)9322 static void nfs41_sequence_release(void *data)
9323 {
9324 struct nfs4_sequence_data *calldata = data;
9325 struct nfs_client *clp = calldata->clp;
9326
9327 if (refcount_read(&clp->cl_count) > 1)
9328 nfs4_schedule_state_renewal(clp);
9329 nfs_put_client(clp);
9330 kfree(calldata);
9331 }
9332
nfs41_sequence_handle_errors(struct rpc_task * task,struct nfs_client * clp)9333 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9334 {
9335 switch(task->tk_status) {
9336 case -NFS4ERR_DELAY:
9337 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9338 return -EAGAIN;
9339 default:
9340 nfs4_schedule_lease_recovery(clp);
9341 }
9342 return 0;
9343 }
9344
nfs41_sequence_call_done(struct rpc_task * task,void * data)9345 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9346 {
9347 struct nfs4_sequence_data *calldata = data;
9348 struct nfs_client *clp = calldata->clp;
9349
9350 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9351 return;
9352
9353 trace_nfs4_sequence(clp, task->tk_status);
9354 if (task->tk_status < 0 && clp->cl_cons_state >= 0) {
9355 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9356 if (refcount_read(&clp->cl_count) == 1)
9357 return;
9358
9359 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9360 rpc_restart_call_prepare(task);
9361 return;
9362 }
9363 }
9364 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9365 }
9366
nfs41_sequence_prepare(struct rpc_task * task,void * data)9367 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9368 {
9369 struct nfs4_sequence_data *calldata = data;
9370 struct nfs_client *clp = calldata->clp;
9371 struct nfs4_sequence_args *args;
9372 struct nfs4_sequence_res *res;
9373
9374 args = task->tk_msg.rpc_argp;
9375 res = task->tk_msg.rpc_resp;
9376
9377 nfs4_setup_sequence(clp, args, res, task);
9378 }
9379
9380 static const struct rpc_call_ops nfs41_sequence_ops = {
9381 .rpc_call_done = nfs41_sequence_call_done,
9382 .rpc_call_prepare = nfs41_sequence_prepare,
9383 .rpc_release = nfs41_sequence_release,
9384 };
9385
_nfs41_proc_sequence(struct nfs_client * clp,const struct cred * cred,struct nfs4_slot * slot,bool is_privileged)9386 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9387 const struct cred *cred,
9388 struct nfs4_slot *slot,
9389 bool is_privileged)
9390 {
9391 struct nfs4_sequence_data *calldata;
9392 struct rpc_message msg = {
9393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9394 .rpc_cred = cred,
9395 };
9396 struct rpc_task_setup task_setup_data = {
9397 .rpc_client = clp->cl_rpcclient,
9398 .rpc_message = &msg,
9399 .callback_ops = &nfs41_sequence_ops,
9400 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9401 };
9402 struct rpc_task *ret;
9403
9404 ret = ERR_PTR(-EIO);
9405 if (!refcount_inc_not_zero(&clp->cl_count))
9406 goto out_err;
9407
9408 ret = ERR_PTR(-ENOMEM);
9409 calldata = kzalloc_obj(*calldata);
9410 if (calldata == NULL)
9411 goto out_put_clp;
9412 nfs4_init_sequence(clp, &calldata->args, &calldata->res, 0, is_privileged);
9413 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9414 msg.rpc_argp = &calldata->args;
9415 msg.rpc_resp = &calldata->res;
9416 calldata->clp = clp;
9417 task_setup_data.callback_data = calldata;
9418
9419 ret = rpc_run_task(&task_setup_data);
9420 if (IS_ERR(ret))
9421 goto out_err;
9422 return ret;
9423 out_put_clp:
9424 nfs_put_client(clp);
9425 out_err:
9426 nfs41_release_slot(slot);
9427 return ret;
9428 }
9429
nfs41_proc_async_sequence(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)9430 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9431 {
9432 struct rpc_task *task;
9433 int ret = 0;
9434
9435 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9436 return -EAGAIN;
9437 task = _nfs41_proc_sequence(clp, cred, NULL, false);
9438 if (IS_ERR(task))
9439 ret = PTR_ERR(task);
9440 else
9441 rpc_put_task_async(task);
9442 dprintk("<-- %s status=%d\n", __func__, ret);
9443 return ret;
9444 }
9445
nfs4_proc_sequence(struct nfs_client * clp,const struct cred * cred)9446 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9447 {
9448 struct rpc_task *task;
9449 int ret;
9450
9451 task = _nfs41_proc_sequence(clp, cred, NULL, true);
9452 if (IS_ERR(task)) {
9453 ret = PTR_ERR(task);
9454 goto out;
9455 }
9456 ret = rpc_wait_for_completion_task(task);
9457 if (!ret)
9458 ret = task->tk_status;
9459 rpc_put_task(task);
9460 out:
9461 dprintk("<-- %s status=%d\n", __func__, ret);
9462 return ret;
9463 }
9464
9465 struct nfs4_reclaim_complete_data {
9466 struct nfs_client *clp;
9467 struct nfs41_reclaim_complete_args arg;
9468 struct nfs41_reclaim_complete_res res;
9469 };
9470
nfs4_reclaim_complete_prepare(struct rpc_task * task,void * data)9471 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9472 {
9473 struct nfs4_reclaim_complete_data *calldata = data;
9474
9475 nfs4_setup_sequence(calldata->clp,
9476 &calldata->arg.seq_args,
9477 &calldata->res.seq_res,
9478 task);
9479 }
9480
nfs41_reclaim_complete_handle_errors(struct rpc_task * task,struct nfs_client * clp)9481 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9482 {
9483 switch(task->tk_status) {
9484 case 0:
9485 wake_up_all(&clp->cl_lock_waitq);
9486 fallthrough;
9487 case -NFS4ERR_COMPLETE_ALREADY:
9488 case -NFS4ERR_WRONG_CRED: /* What to do here? */
9489 break;
9490 case -NFS4ERR_DELAY:
9491 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9492 fallthrough;
9493 case -NFS4ERR_RETRY_UNCACHED_REP:
9494 case -EACCES:
9495 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9496 __func__, task->tk_status, clp->cl_hostname);
9497 return -EAGAIN;
9498 case -NFS4ERR_BADSESSION:
9499 case -NFS4ERR_DEADSESSION:
9500 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9501 break;
9502 default:
9503 nfs4_schedule_lease_recovery(clp);
9504 }
9505 return 0;
9506 }
9507
nfs4_reclaim_complete_done(struct rpc_task * task,void * data)9508 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9509 {
9510 struct nfs4_reclaim_complete_data *calldata = data;
9511 struct nfs_client *clp = calldata->clp;
9512 struct nfs4_sequence_res *res = &calldata->res.seq_res;
9513
9514 if (!nfs41_sequence_done(task, res))
9515 return;
9516
9517 trace_nfs4_reclaim_complete(clp, task->tk_status);
9518 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9519 rpc_restart_call_prepare(task);
9520 return;
9521 }
9522 }
9523
nfs4_free_reclaim_complete_data(void * data)9524 static void nfs4_free_reclaim_complete_data(void *data)
9525 {
9526 struct nfs4_reclaim_complete_data *calldata = data;
9527
9528 kfree(calldata);
9529 }
9530
9531 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9532 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9533 .rpc_call_done = nfs4_reclaim_complete_done,
9534 .rpc_release = nfs4_free_reclaim_complete_data,
9535 };
9536
9537 /*
9538 * Issue a global reclaim complete.
9539 */
nfs41_proc_reclaim_complete(struct nfs_client * clp,const struct cred * cred)9540 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9541 const struct cred *cred)
9542 {
9543 struct nfs4_reclaim_complete_data *calldata;
9544 struct rpc_message msg = {
9545 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9546 .rpc_cred = cred,
9547 };
9548 struct rpc_task_setup task_setup_data = {
9549 .rpc_client = clp->cl_rpcclient,
9550 .rpc_message = &msg,
9551 .callback_ops = &nfs4_reclaim_complete_call_ops,
9552 .flags = RPC_TASK_NO_ROUND_ROBIN,
9553 };
9554 int status = -ENOMEM;
9555
9556 calldata = kzalloc_obj(*calldata, GFP_NOFS);
9557 if (calldata == NULL)
9558 goto out;
9559 calldata->clp = clp;
9560 calldata->arg.one_fs = 0;
9561
9562 nfs4_init_sequence(clp, &calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9563 msg.rpc_argp = &calldata->arg;
9564 msg.rpc_resp = &calldata->res;
9565 task_setup_data.callback_data = calldata;
9566 status = nfs4_call_sync_custom(&task_setup_data);
9567 out:
9568 dprintk("<-- %s status=%d\n", __func__, status);
9569 return status;
9570 }
9571
9572 static void
nfs4_layoutget_prepare(struct rpc_task * task,void * calldata)9573 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9574 {
9575 struct nfs4_layoutget *lgp = calldata;
9576 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9577
9578 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9579 &lgp->res.seq_res, task);
9580 }
9581
nfs4_layoutget_done(struct rpc_task * task,void * calldata)9582 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9583 {
9584 struct nfs4_layoutget *lgp = calldata;
9585
9586 nfs41_sequence_process(task, &lgp->res.seq_res);
9587 }
9588
9589 static int
nfs4_layoutget_handle_exception(struct rpc_task * task,struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9590 nfs4_layoutget_handle_exception(struct rpc_task *task,
9591 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9592 {
9593 struct inode *inode = lgp->args.inode;
9594 struct nfs_server *server = NFS_SERVER(inode);
9595 struct pnfs_layout_hdr *lo = lgp->lo;
9596 int nfs4err = task->tk_status;
9597 int err, status = 0;
9598 LIST_HEAD(head);
9599
9600 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9601
9602 nfs4_sequence_free_slot(&lgp->res.seq_res);
9603
9604 exception->state = NULL;
9605 exception->stateid = NULL;
9606
9607 switch (nfs4err) {
9608 case 0:
9609 goto out;
9610
9611 /*
9612 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9613 * on the file. set tk_status to -ENODATA to tell upper layer to
9614 * retry go inband.
9615 */
9616 case -NFS4ERR_LAYOUTUNAVAILABLE:
9617 status = -ENODATA;
9618 goto out;
9619 /*
9620 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9621 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9622 */
9623 case -NFS4ERR_BADLAYOUT:
9624 status = -EOVERFLOW;
9625 goto out;
9626 /*
9627 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9628 * (or clients) writing to the same RAID stripe except when
9629 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9630 *
9631 * Treat it like we would RECALLCONFLICT -- we retry for a little
9632 * while, and then eventually give up.
9633 */
9634 case -NFS4ERR_LAYOUTTRYLATER:
9635 if (lgp->args.minlength == 0) {
9636 status = -EOVERFLOW;
9637 goto out;
9638 }
9639 status = -EBUSY;
9640 break;
9641 case -NFS4ERR_RECALLCONFLICT:
9642 case -NFS4ERR_RETURNCONFLICT:
9643 status = -ERECALLCONFLICT;
9644 break;
9645 case -NFS4ERR_DELEG_REVOKED:
9646 case -NFS4ERR_ADMIN_REVOKED:
9647 case -NFS4ERR_EXPIRED:
9648 case -NFS4ERR_BAD_STATEID:
9649 exception->timeout = 0;
9650 spin_lock(&inode->i_lock);
9651 /* If the open stateid was bad, then recover it. */
9652 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9653 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9654 spin_unlock(&inode->i_lock);
9655 exception->state = lgp->args.ctx->state;
9656 exception->stateid = &lgp->args.stateid;
9657 break;
9658 }
9659
9660 /*
9661 * Mark the bad layout state as invalid, then retry
9662 */
9663 pnfs_mark_layout_stateid_invalid(lo, &head);
9664 spin_unlock(&inode->i_lock);
9665 nfs_commit_inode(inode, 0);
9666 pnfs_free_lseg_list(&head);
9667 status = -EAGAIN;
9668 goto out;
9669 }
9670
9671 err = nfs4_handle_exception(server, nfs4err, exception);
9672 if (!status) {
9673 if (exception->retry)
9674 status = -EAGAIN;
9675 else
9676 status = err;
9677 }
9678 out:
9679 return status;
9680 }
9681
max_response_pages(struct nfs_server * server)9682 size_t max_response_pages(struct nfs_server *server)
9683 {
9684 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9685 return nfs_page_array_len(0, max_resp_sz);
9686 }
9687
nfs4_layoutget_release(void * calldata)9688 static void nfs4_layoutget_release(void *calldata)
9689 {
9690 struct nfs4_layoutget *lgp = calldata;
9691
9692 nfs4_sequence_free_slot(&lgp->res.seq_res);
9693 pnfs_layoutget_free(lgp);
9694 }
9695
9696 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9697 .rpc_call_prepare = nfs4_layoutget_prepare,
9698 .rpc_call_done = nfs4_layoutget_done,
9699 .rpc_release = nfs4_layoutget_release,
9700 };
9701
9702 struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9703 nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
9704 struct nfs4_exception *exception)
9705 {
9706 struct inode *inode = lgp->args.inode;
9707 struct nfs_server *server = NFS_SERVER(inode);
9708 struct rpc_task *task;
9709 struct rpc_message msg = {
9710 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9711 .rpc_argp = &lgp->args,
9712 .rpc_resp = &lgp->res,
9713 .rpc_cred = lgp->cred,
9714 };
9715 struct rpc_task_setup task_setup_data = {
9716 .rpc_client = server->client,
9717 .rpc_message = &msg,
9718 .callback_ops = &nfs4_layoutget_call_ops,
9719 .callback_data = lgp,
9720 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9721 RPC_TASK_MOVEABLE,
9722 };
9723 struct pnfs_layout_segment *lseg = NULL;
9724 int status = 0;
9725
9726 nfs4_init_sequence(server->nfs_client, &lgp->args.seq_args,
9727 &lgp->res.seq_res, 0, 0);
9728 exception->retry = 0;
9729
9730 task = rpc_run_task(&task_setup_data);
9731 if (IS_ERR(task))
9732 return ERR_CAST(task);
9733
9734 status = rpc_wait_for_completion_task(task);
9735 if (status != 0)
9736 goto out;
9737
9738 if (task->tk_status < 0) {
9739 exception->retry = 1;
9740 status = nfs4_layoutget_handle_exception(task, lgp, exception);
9741 } else if (lgp->res.layoutp->len == 0) {
9742 exception->retry = 1;
9743 status = -EAGAIN;
9744 nfs4_update_delay(&exception->timeout);
9745 } else
9746 lseg = pnfs_layout_process(lgp);
9747 out:
9748 trace_nfs4_layoutget(lgp->args.ctx,
9749 &lgp->args.range,
9750 &lgp->res.range,
9751 &lgp->res.stateid,
9752 status);
9753
9754 rpc_put_task(task);
9755 dprintk("<-- %s status=%d\n", __func__, status);
9756 if (status)
9757 return ERR_PTR(status);
9758 return lseg;
9759 }
9760
9761 static void
nfs4_layoutreturn_prepare(struct rpc_task * task,void * calldata)9762 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9763 {
9764 struct nfs4_layoutreturn *lrp = calldata;
9765
9766 nfs4_setup_sequence(lrp->clp,
9767 &lrp->args.seq_args,
9768 &lrp->res.seq_res,
9769 task);
9770 if (!pnfs_layout_is_valid(lrp->args.layout))
9771 rpc_exit(task, 0);
9772 }
9773
nfs4_layoutreturn_done(struct rpc_task * task,void * calldata)9774 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9775 {
9776 struct nfs4_layoutreturn *lrp = calldata;
9777 struct nfs_server *server;
9778
9779 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9780 return;
9781
9782 if (task->tk_rpc_status < 0) {
9783 switch (task->tk_rpc_status) {
9784 case -EACCES:
9785 case -EIO:
9786 case -EKEYEXPIRED:
9787 case -ERESTARTSYS:
9788 case -EINTR:
9789 lrp->rpc_status = 0;
9790 break;
9791 case -ENETDOWN:
9792 case -ENETUNREACH:
9793 if (task->tk_flags & RPC_TASK_NETUNREACH_FATAL)
9794 lrp->rpc_status = 0;
9795 else
9796 lrp->rpc_status = -EAGAIN;
9797 break;
9798 default:
9799 lrp->rpc_status = -EAGAIN;
9800 break;
9801 }
9802 lrp->res.lrs_present = 0;
9803 return;
9804 }
9805
9806 server = NFS_SERVER(lrp->args.inode);
9807 switch (task->tk_status) {
9808 case -NFS4ERR_OLD_STATEID:
9809 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9810 &lrp->args.range,
9811 lrp->args.inode))
9812 goto out_restart;
9813 fallthrough;
9814 default:
9815 task->tk_status = 0;
9816 lrp->res.lrs_present = 0;
9817 fallthrough;
9818 case 0:
9819 break;
9820 case -NFS4ERR_BADSESSION:
9821 case -NFS4ERR_DEADSESSION:
9822 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9823 nfs4_schedule_session_recovery(server->nfs_client->cl_session,
9824 task->tk_status);
9825 lrp->res.lrs_present = 0;
9826 lrp->rpc_status = -EAGAIN;
9827 task->tk_status = 0;
9828 break;
9829 case -NFS4ERR_DELAY:
9830 if (nfs4_async_handle_error(task, server, NULL, NULL) ==
9831 -EAGAIN)
9832 goto out_restart;
9833 lrp->res.lrs_present = 0;
9834 break;
9835 }
9836 return;
9837 out_restart:
9838 task->tk_status = 0;
9839 nfs4_sequence_free_slot(&lrp->res.seq_res);
9840 rpc_restart_call_prepare(task);
9841 }
9842
nfs4_layoutreturn_release(void * calldata)9843 static void nfs4_layoutreturn_release(void *calldata)
9844 {
9845 struct nfs4_layoutreturn *lrp = calldata;
9846 struct pnfs_layout_hdr *lo = lrp->args.layout;
9847
9848 if (lrp->rpc_status == 0 || !lrp->inode)
9849 pnfs_layoutreturn_free_lsegs(
9850 lo, &lrp->args.stateid, &lrp->args.range,
9851 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9852 else
9853 pnfs_layoutreturn_retry_later(lo, &lrp->args.stateid,
9854 &lrp->args.range);
9855 nfs4_sequence_free_slot(&lrp->res.seq_res);
9856 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9857 lrp->ld_private.ops->free(&lrp->ld_private);
9858 pnfs_put_layout_hdr(lrp->args.layout);
9859 nfs_iput_and_deactive(lrp->inode);
9860 put_cred(lrp->cred);
9861 kfree(calldata);
9862 }
9863
9864 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9865 .rpc_call_prepare = nfs4_layoutreturn_prepare,
9866 .rpc_call_done = nfs4_layoutreturn_done,
9867 .rpc_release = nfs4_layoutreturn_release,
9868 };
9869
nfs4_proc_layoutreturn(struct nfs4_layoutreturn * lrp,unsigned int flags)9870 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, unsigned int flags)
9871 {
9872 struct nfs_client *clp = NFS_SERVER(lrp->args.inode)->nfs_client;
9873 struct rpc_task *task;
9874 struct rpc_message msg = {
9875 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9876 .rpc_argp = &lrp->args,
9877 .rpc_resp = &lrp->res,
9878 .rpc_cred = lrp->cred,
9879 };
9880 struct rpc_task_setup task_setup_data = {
9881 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9882 .rpc_message = &msg,
9883 .callback_ops = &nfs4_layoutreturn_call_ops,
9884 .callback_data = lrp,
9885 .flags = RPC_TASK_MOVEABLE,
9886 };
9887 int status = 0;
9888
9889 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9890 &task_setup_data.rpc_client, &msg);
9891
9892 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9893 if (flags & PNFS_FL_LAYOUTRETURN_ASYNC) {
9894 if (!lrp->inode) {
9895 nfs4_layoutreturn_release(lrp);
9896 return -EAGAIN;
9897 }
9898 task_setup_data.flags |= RPC_TASK_ASYNC;
9899 }
9900 if (!lrp->inode)
9901 flags |= PNFS_FL_LAYOUTRETURN_PRIVILEGED;
9902
9903 nfs4_init_sequence(clp, &lrp->args.seq_args, &lrp->res.seq_res, 1,
9904 flags & PNFS_FL_LAYOUTRETURN_PRIVILEGED ? 1 : 0);
9905 task = rpc_run_task(&task_setup_data);
9906 if (IS_ERR(task))
9907 return PTR_ERR(task);
9908 if (!(flags & PNFS_FL_LAYOUTRETURN_ASYNC))
9909 status = task->tk_status;
9910 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9911 dprintk("<-- %s status=%d\n", __func__, status);
9912 rpc_put_task(task);
9913 return status;
9914 }
9915
9916 static int
_nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9917 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9918 struct pnfs_device *pdev,
9919 const struct cred *cred)
9920 {
9921 struct nfs4_getdeviceinfo_args args = {
9922 .pdev = pdev,
9923 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9924 NOTIFY_DEVICEID4_DELETE,
9925 };
9926 struct nfs4_getdeviceinfo_res res = {
9927 .pdev = pdev,
9928 };
9929 struct rpc_message msg = {
9930 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9931 .rpc_argp = &args,
9932 .rpc_resp = &res,
9933 .rpc_cred = cred,
9934 };
9935 int status;
9936
9937 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9938 if (res.notification & ~args.notify_types)
9939 dprintk("%s: unsupported notification\n", __func__);
9940 if (res.notification != args.notify_types)
9941 pdev->nocache = 1;
9942
9943 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9944
9945 dprintk("<-- %s status=%d\n", __func__, status);
9946
9947 return status;
9948 }
9949
nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9950 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9951 struct pnfs_device *pdev,
9952 const struct cred *cred)
9953 {
9954 struct nfs4_exception exception = { };
9955 int err;
9956
9957 do {
9958 err = nfs4_handle_exception(server,
9959 _nfs4_proc_getdeviceinfo(server, pdev, cred),
9960 &exception);
9961 } while (exception.retry);
9962 return err;
9963 }
9964 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9965
nfs4_layoutcommit_prepare(struct rpc_task * task,void * calldata)9966 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9967 {
9968 struct nfs4_layoutcommit_data *data = calldata;
9969 struct nfs_server *server = NFS_SERVER(data->args.inode);
9970
9971 nfs4_setup_sequence(server->nfs_client,
9972 &data->args.seq_args,
9973 &data->res.seq_res,
9974 task);
9975 }
9976
9977 static void
nfs4_layoutcommit_done(struct rpc_task * task,void * calldata)9978 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9979 {
9980 struct nfs4_layoutcommit_data *data = calldata;
9981 struct nfs_server *server = NFS_SERVER(data->args.inode);
9982
9983 if (!nfs41_sequence_done(task, &data->res.seq_res))
9984 return;
9985
9986 switch (task->tk_status) { /* Just ignore these failures */
9987 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9988 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
9989 case -NFS4ERR_BADLAYOUT: /* no layout */
9990 case -NFS4ERR_GRACE: /* loca_recalim always false */
9991 task->tk_status = 0;
9992 break;
9993 case -NFS4ERR_OLD_STATEID: {
9994 u32 old_seqid = be32_to_cpu(data->args.stateid.seqid);
9995 struct pnfs_layout_range range = {
9996 .iomode = IOMODE_ANY,
9997 .offset = 0,
9998 .length = NFS4_MAX_UINT64,
9999 };
10000
10001 if (nfs4_layout_refresh_old_stateid(&data->args.stateid,
10002 &range,
10003 data->args.inode)) {
10004 struct pnfs_layout_hdr *lo;
10005
10006 spin_lock(&data->args.inode->i_lock);
10007 lo = NFS_I(data->args.inode)->layout;
10008 if (lo && pnfs_layout_is_valid(lo) &&
10009 nfs4_stateid_match_other(&data->args.stateid,
10010 &lo->plh_stateid))
10011 pnfs_set_layout_stateid(lo, &data->args.stateid,
10012 NULL, false);
10013 spin_unlock(&data->args.inode->i_lock);
10014
10015 dprintk("%s: refreshed OLD_STATEID inode %llu seq %u->%u\n",
10016 __func__, data->args.inode->i_ino,
10017 old_seqid,
10018 be32_to_cpu(data->args.stateid.seqid));
10019
10020 rpc_restart_call_prepare(task);
10021 return;
10022 }
10023 fallthrough;
10024 }
10025 case 0:
10026 break;
10027 default:
10028 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10029 rpc_restart_call_prepare(task);
10030 return;
10031 }
10032 }
10033 }
10034
nfs4_layoutcommit_release(void * calldata)10035 static void nfs4_layoutcommit_release(void *calldata)
10036 {
10037 struct nfs4_layoutcommit_data *data = calldata;
10038
10039 pnfs_cleanup_layoutcommit(data);
10040 nfs_post_op_update_inode_force_wcc(data->args.inode,
10041 data->res.fattr);
10042 put_cred(data->cred);
10043 nfs_iput_and_deactive(data->inode);
10044 kfree(data);
10045 }
10046
10047 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10048 .rpc_call_prepare = nfs4_layoutcommit_prepare,
10049 .rpc_call_done = nfs4_layoutcommit_done,
10050 .rpc_release = nfs4_layoutcommit_release,
10051 };
10052
10053 int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data * data,bool sync)10054 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10055 {
10056 struct rpc_message msg = {
10057 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10058 .rpc_argp = &data->args,
10059 .rpc_resp = &data->res,
10060 .rpc_cred = data->cred,
10061 };
10062 struct rpc_task_setup task_setup_data = {
10063 .task = &data->task,
10064 .rpc_client = NFS_CLIENT(data->args.inode),
10065 .rpc_message = &msg,
10066 .callback_ops = &nfs4_layoutcommit_ops,
10067 .callback_data = data,
10068 .flags = RPC_TASK_MOVEABLE,
10069 };
10070 struct rpc_task *task;
10071 int status = 0;
10072
10073 dprintk("NFS: initiating layoutcommit call. sync %d "
10074 "lbw: %llu inode %llu\n", sync,
10075 data->args.lastbytewritten,
10076 data->args.inode->i_ino);
10077
10078 if (!sync) {
10079 data->inode = nfs_igrab_and_active(data->args.inode);
10080 if (data->inode == NULL) {
10081 nfs4_layoutcommit_release(data);
10082 return -EAGAIN;
10083 }
10084 task_setup_data.flags = RPC_TASK_ASYNC;
10085 }
10086 nfs4_init_sequence(NFS_SERVER(data->args.inode)->nfs_client,
10087 &data->args.seq_args, &data->res.seq_res, 1, 0);
10088 task = rpc_run_task(&task_setup_data);
10089 if (IS_ERR(task))
10090 return PTR_ERR(task);
10091 if (sync)
10092 status = task->tk_status;
10093 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10094 dprintk("%s: status %d\n", __func__, status);
10095 rpc_put_task(task);
10096 return status;
10097 }
10098
10099 /*
10100 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10101 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10102 */
_nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_secinfo_flavors * flavors,bool use_integrity)10103 static int _nfs41_proc_secinfo_no_name(struct nfs_server *server,
10104 struct nfs_fh *fhandle,
10105 struct nfs4_secinfo_flavors *flavors,
10106 bool use_integrity)
10107 {
10108 struct nfs_client *clp = server->nfs_client;
10109 struct nfs41_secinfo_no_name_args args = {
10110 .style = SECINFO_STYLE_CURRENT_FH,
10111 };
10112 struct nfs4_secinfo_res res = {
10113 .flavors = flavors,
10114 };
10115 struct rpc_message msg = {
10116 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10117 .rpc_argp = &args,
10118 .rpc_resp = &res,
10119 };
10120 struct nfs4_call_sync_data data = {
10121 .seq_server = server,
10122 .seq_args = &args.seq_args,
10123 .seq_res = &res.seq_res,
10124 };
10125 struct rpc_task_setup task_setup = {
10126 .rpc_client = server->client,
10127 .rpc_message = &msg,
10128 .callback_ops = clp->cl_mvops->call_sync_ops,
10129 .callback_data = &data,
10130 .flags = RPC_TASK_NO_ROUND_ROBIN,
10131 };
10132 const struct cred *cred = NULL;
10133 int status;
10134
10135 if (use_integrity) {
10136 task_setup.rpc_client = clp->cl_rpcclient;
10137
10138 cred = nfs4_get_clid_cred(clp);
10139 msg.rpc_cred = cred;
10140 }
10141
10142 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 0);
10143 status = nfs4_call_sync_custom(&task_setup);
10144 dprintk("<-- %s status=%d\n", __func__, status);
10145
10146 put_cred(cred);
10147
10148 return status;
10149 }
10150
nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_secinfo_flavors * flavors)10151 static int nfs41_proc_secinfo_no_name(struct nfs_server *server,
10152 struct nfs_fh *fhandle,
10153 struct nfs4_secinfo_flavors *flavors)
10154 {
10155 struct nfs4_exception exception = {
10156 .interruptible = true,
10157 };
10158 int err;
10159 do {
10160 /* first try using integrity protection */
10161 err = -NFS4ERR_WRONGSEC;
10162
10163 /* try to use integrity protection with machine cred */
10164 if (_nfs4_is_integrity_protected(server->nfs_client))
10165 err = _nfs41_proc_secinfo_no_name(server, fhandle,
10166 flavors, true);
10167
10168 /*
10169 * if unable to use integrity protection, or SECINFO with
10170 * integrity protection returns NFS4ERR_WRONGSEC (which is
10171 * disallowed by spec, but exists in deployed servers) use
10172 * the current filesystem's rpc_client and the user cred.
10173 */
10174 if (err == -NFS4ERR_WRONGSEC)
10175 err = _nfs41_proc_secinfo_no_name(server, fhandle,
10176 flavors, false);
10177
10178 switch (err) {
10179 case 0:
10180 case -NFS4ERR_WRONGSEC:
10181 case -ENOTSUPP:
10182 goto out;
10183 default:
10184 err = nfs4_handle_exception(server, err, &exception);
10185 }
10186 } while (exception.retry);
10187 out:
10188 return err;
10189 }
10190
nfs41_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)10191 static int nfs41_find_root_sec(struct nfs_server *server,
10192 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
10193 {
10194 int err;
10195 struct page *page;
10196 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10197 struct nfs4_secinfo_flavors *flavors;
10198 struct nfs4_secinfo4 *secinfo;
10199 int i;
10200
10201 page = alloc_page(GFP_KERNEL);
10202 if (!page) {
10203 err = -ENOMEM;
10204 goto out;
10205 }
10206
10207 flavors = page_address(page);
10208 err = nfs41_proc_secinfo_no_name(server, fhandle, flavors);
10209
10210 /*
10211 * Fall back on "guess and check" method if
10212 * the server doesn't support SECINFO_NO_NAME
10213 */
10214 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10215 err = nfs4_find_root_sec(server, fhandle, fattr);
10216 goto out_freepage;
10217 }
10218 if (err)
10219 goto out_freepage;
10220
10221 for (i = 0; i < flavors->num_flavors; i++) {
10222 secinfo = &flavors->flavors[i];
10223
10224 switch (secinfo->flavor) {
10225 case RPC_AUTH_NULL:
10226 case RPC_AUTH_UNIX:
10227 case RPC_AUTH_GSS:
10228 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10229 &secinfo->flavor_info);
10230 break;
10231 default:
10232 flavor = RPC_AUTH_MAXFLAVOR;
10233 break;
10234 }
10235
10236 if (!nfs_auth_info_match(&server->auth_info, flavor))
10237 flavor = RPC_AUTH_MAXFLAVOR;
10238
10239 if (flavor != RPC_AUTH_MAXFLAVOR) {
10240 err = nfs4_lookup_root_sec(server, fhandle, fattr,
10241 flavor);
10242 if (!err)
10243 break;
10244 }
10245 }
10246
10247 if (flavor == RPC_AUTH_MAXFLAVOR)
10248 err = -EPERM;
10249
10250 out_freepage:
10251 put_page(page);
10252 if (err == -EACCES)
10253 return -EPERM;
10254 out:
10255 return err;
10256 }
10257
_nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10258 static int _nfs41_test_stateid(struct nfs_server *server,
10259 const nfs4_stateid *stateid,
10260 const struct cred *cred)
10261 {
10262 int status;
10263 struct nfs41_test_stateid_args args = {
10264 .stateid = *stateid,
10265 };
10266 struct nfs41_test_stateid_res res;
10267 struct rpc_message msg = {
10268 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10269 .rpc_argp = &args,
10270 .rpc_resp = &res,
10271 .rpc_cred = cred,
10272 };
10273 struct rpc_clnt *rpc_client = server->client;
10274 struct nfs_client *clp = server->nfs_client;
10275
10276 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_STATEID, &rpc_client, &msg);
10277
10278 dprintk("NFS call test_stateid %p\n", stateid);
10279 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 1);
10280 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10281 &args.seq_args, &res.seq_res);
10282 if (status != NFS_OK) {
10283 dprintk("NFS reply test_stateid: failed, %d\n", status);
10284 return status;
10285 }
10286 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10287 return -res.status;
10288 }
10289
nfs4_handle_delay_or_session_error(struct nfs_server * server,int err,struct nfs4_exception * exception)10290 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10291 int err, struct nfs4_exception *exception)
10292 {
10293 exception->retry = 0;
10294 switch(err) {
10295 case -NFS4ERR_DELAY:
10296 case -NFS4ERR_RETRY_UNCACHED_REP:
10297 nfs4_handle_exception(server, err, exception);
10298 break;
10299 case -NFS4ERR_BADSESSION:
10300 case -NFS4ERR_BADSLOT:
10301 case -NFS4ERR_BAD_HIGH_SLOT:
10302 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10303 case -NFS4ERR_DEADSESSION:
10304 nfs4_do_handle_exception(server, err, exception);
10305 }
10306 }
10307
10308 /**
10309 * nfs41_test_stateid - perform a TEST_STATEID operation
10310 *
10311 * @server: server / transport on which to perform the operation
10312 * @stateid: state ID to test
10313 * @cred: credential
10314 *
10315 * Returns NFS_OK if the server recognizes that "stateid" is valid.
10316 * Otherwise a negative NFS4ERR value is returned if the operation
10317 * failed or the state ID is not currently valid.
10318 */
nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10319 static int nfs41_test_stateid(struct nfs_server *server,
10320 const nfs4_stateid *stateid,
10321 const struct cred *cred)
10322 {
10323 struct nfs4_exception exception = {
10324 .interruptible = true,
10325 };
10326 int err;
10327 do {
10328 err = _nfs41_test_stateid(server, stateid, cred);
10329 nfs4_handle_delay_or_session_error(server, err, &exception);
10330 } while (exception.retry);
10331 return err;
10332 }
10333
10334 struct nfs_free_stateid_data {
10335 struct nfs_server *server;
10336 struct nfs41_free_stateid_args args;
10337 struct nfs41_free_stateid_res res;
10338 };
10339
nfs41_free_stateid_prepare(struct rpc_task * task,void * calldata)10340 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10341 {
10342 struct nfs_free_stateid_data *data = calldata;
10343 nfs4_setup_sequence(data->server->nfs_client,
10344 &data->args.seq_args,
10345 &data->res.seq_res,
10346 task);
10347 }
10348
nfs41_free_stateid_done(struct rpc_task * task,void * calldata)10349 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10350 {
10351 struct nfs_free_stateid_data *data = calldata;
10352
10353 nfs41_sequence_done(task, &data->res.seq_res);
10354
10355 switch (task->tk_status) {
10356 case -NFS4ERR_DELAY:
10357 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10358 rpc_restart_call_prepare(task);
10359 }
10360 }
10361
nfs41_free_stateid_release(void * calldata)10362 static void nfs41_free_stateid_release(void *calldata)
10363 {
10364 struct nfs_free_stateid_data *data = calldata;
10365 struct nfs_client *clp = data->server->nfs_client;
10366
10367 nfs_sb_deactive(data->server->super);
10368 nfs_put_client(clp);
10369 kfree(calldata);
10370 }
10371
10372 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10373 .rpc_call_prepare = nfs41_free_stateid_prepare,
10374 .rpc_call_done = nfs41_free_stateid_done,
10375 .rpc_release = nfs41_free_stateid_release,
10376 };
10377
10378 /**
10379 * nfs41_free_stateid - perform a FREE_STATEID operation
10380 *
10381 * @server: server / transport on which to perform the operation
10382 * @stateid: state ID to release
10383 * @cred: credential
10384 * @privileged: set to true if this call needs to be privileged
10385 *
10386 * Note: this function is always asynchronous.
10387 */
nfs41_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred,bool privileged)10388 static int nfs41_free_stateid(struct nfs_server *server,
10389 nfs4_stateid *stateid,
10390 const struct cred *cred,
10391 bool privileged)
10392 {
10393 struct rpc_message msg = {
10394 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10395 .rpc_cred = cred,
10396 };
10397 struct rpc_task_setup task_setup = {
10398 .rpc_client = server->client,
10399 .rpc_message = &msg,
10400 .callback_ops = &nfs41_free_stateid_ops,
10401 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10402 };
10403 struct nfs_free_stateid_data *data;
10404 struct rpc_task *task;
10405 struct nfs_client *clp = server->nfs_client;
10406 int ret = -EIO;
10407
10408 if (!refcount_inc_not_zero(&clp->cl_count))
10409 return ret;
10410 if (!nfs_sb_active(server->super))
10411 goto out_put_clp;
10412
10413 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_STATEID,
10414 &task_setup.rpc_client, &msg);
10415
10416 dprintk("NFS call free_stateid %p\n", stateid);
10417 data = kmalloc_obj(*data);
10418 if (!data) {
10419 ret = -ENOMEM;
10420 goto out_put_server;
10421 }
10422 data->server = server;
10423 nfs4_stateid_copy(&data->args.stateid, stateid);
10424
10425 task_setup.callback_data = data;
10426
10427 msg.rpc_argp = &data->args;
10428 msg.rpc_resp = &data->res;
10429 nfs4_init_sequence(clp, &data->args.seq_args, &data->res.seq_res, 1,
10430 privileged);
10431 task = rpc_run_task(&task_setup);
10432 if (IS_ERR(task))
10433 return PTR_ERR(task);
10434 rpc_put_task(task);
10435 stateid->type = NFS4_FREED_STATEID_TYPE;
10436 return 0;
10437 out_put_server:
10438 nfs_sb_deactive(server->super);
10439 out_put_clp:
10440 nfs_put_client(clp);
10441 return ret;
10442 }
10443
10444 static void
nfs41_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)10445 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10446 {
10447 const struct cred *cred = lsp->ls_state->owner->so_cred;
10448
10449 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10450 nfs4_free_lock_state(server, lsp);
10451 }
10452
nfs41_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10453 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10454 const nfs4_stateid *s2)
10455 {
10456 trace_nfs41_match_stateid(s1, s2);
10457
10458 if (s1->type != s2->type)
10459 return false;
10460
10461 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10462 return false;
10463
10464 if (s1->seqid == s2->seqid)
10465 return true;
10466
10467 return s1->seqid == 0 || s2->seqid == 0;
10468 }
10469
nfs4_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10470 bool nfs4_match_stateid(const nfs4_stateid *s1,
10471 const nfs4_stateid *s2)
10472 {
10473 trace_nfs4_match_stateid(s1, s2);
10474
10475 return nfs4_stateid_match(s1, s2);
10476 }
10477
10478
10479 static const struct nfs4_sequence_slot_ops nfs41_sequence_slot_ops = {
10480 .process = nfs41_sequence_process,
10481 .done = nfs41_sequence_done,
10482 .free_slot = nfs41_sequence_free_slot,
10483 };
10484
10485 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10486 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10487 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10488 .recover_open = nfs4_open_reclaim,
10489 .recover_lock = nfs4_lock_reclaim,
10490 .establish_clid = nfs41_init_clientid,
10491 .reclaim_complete = nfs41_proc_reclaim_complete,
10492 .detect_trunking = nfs41_discover_server_trunking,
10493 };
10494
10495 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10496 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10497 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10498 .recover_open = nfs41_open_expired,
10499 .recover_lock = nfs41_lock_expired,
10500 .establish_clid = nfs41_init_clientid,
10501 };
10502
10503 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10504 .sched_state_renewal = nfs41_proc_async_sequence,
10505 .get_state_renewal_cred = nfs4_get_machine_cred,
10506 .renew_lease = nfs4_proc_sequence,
10507 };
10508
10509 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10510 .get_locations = _nfs41_proc_get_locations,
10511 .fsid_present = _nfs41_proc_fsid_present,
10512 };
10513
10514 static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter * arg1,gfp_t arg2)10515 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10516 {
10517 return NULL;
10518 }
10519
10520 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10521 .minor_version = 1,
10522 .init_caps = NFS_CAP_READDIRPLUS
10523 | NFS_CAP_ATOMIC_OPEN
10524 | NFS_CAP_DIR_DELEG
10525 | NFS_CAP_POSIX_LOCK
10526 | NFS_CAP_STATEID_NFSV41
10527 | NFS_CAP_ATOMIC_OPEN_V1
10528 | NFS_CAP_LGOPEN
10529 | NFS_CAP_MOVEABLE,
10530 .init_client = nfs41_init_client,
10531 .shutdown_client = nfs41_shutdown_client,
10532 .match_stateid = nfs41_match_stateid,
10533 .find_root_sec = nfs41_find_root_sec,
10534 .free_lock_state = nfs41_free_lock_state,
10535 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10536 .alloc_seqid = nfs_alloc_no_seqid,
10537 .session_trunk = nfs4_test_session_trunk,
10538 .call_sync_ops = &nfs41_call_sync_ops,
10539 .sequence_slot_ops = &nfs41_sequence_slot_ops,
10540 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10541 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10542 .state_renewal_ops = &nfs41_state_renewal_ops,
10543 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10544 };
10545
10546 #if defined(CONFIG_NFS_V4_2)
10547 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10548 .minor_version = 2,
10549 .init_caps = NFS_CAP_READDIRPLUS
10550 | NFS_CAP_ATOMIC_OPEN
10551 | NFS_CAP_DIR_DELEG
10552 | NFS_CAP_POSIX_LOCK
10553 | NFS_CAP_STATEID_NFSV41
10554 | NFS_CAP_ATOMIC_OPEN_V1
10555 | NFS_CAP_LGOPEN
10556 | NFS_CAP_ALLOCATE
10557 | NFS_CAP_COPY
10558 | NFS_CAP_OFFLOAD_CANCEL
10559 | NFS_CAP_COPY_NOTIFY
10560 | NFS_CAP_DEALLOCATE
10561 | NFS_CAP_ZERO_RANGE
10562 | NFS_CAP_SEEK
10563 | NFS_CAP_LAYOUTSTATS
10564 | NFS_CAP_CLONE
10565 | NFS_CAP_LAYOUTERROR
10566 | NFS_CAP_READ_PLUS
10567 | NFS_CAP_MOVEABLE
10568 | NFS_CAP_OFFLOAD_STATUS,
10569 .init_client = nfs41_init_client,
10570 .shutdown_client = nfs41_shutdown_client,
10571 .match_stateid = nfs41_match_stateid,
10572 .find_root_sec = nfs41_find_root_sec,
10573 .free_lock_state = nfs41_free_lock_state,
10574 .call_sync_ops = &nfs41_call_sync_ops,
10575 .sequence_slot_ops = &nfs41_sequence_slot_ops,
10576 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10577 .alloc_seqid = nfs_alloc_no_seqid,
10578 .session_trunk = nfs4_test_session_trunk,
10579 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10580 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10581 .state_renewal_ops = &nfs41_state_renewal_ops,
10582 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10583 };
10584 #endif
10585
10586 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10587 #if defined(CONFIG_NFS_V4_0)
10588 [0] = &nfs_v4_0_minor_ops,
10589 #endif /* CONFIG_NFS_V4_0 */
10590 [1] = &nfs_v4_1_minor_ops,
10591 #if defined(CONFIG_NFS_V4_2)
10592 [2] = &nfs_v4_2_minor_ops,
10593 #endif
10594 };
10595
nfs4_listxattr(struct dentry * dentry,char * list,size_t size)10596 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10597 {
10598 ssize_t error, error2, error3;
10599 ssize_t left = size;
10600 ssize_t left2;
10601
10602 error = generic_listxattr(dentry, list, left);
10603 if (error < 0)
10604 return error;
10605 if (list) {
10606 list += error;
10607 left -= error;
10608 }
10609
10610 left2 = left;
10611 error2 = security_inode_listsecurity(d_inode(dentry), &list, &left2);
10612 if (error2 < 0)
10613 return error2;
10614 error2 = left - left2;
10615 if (list)
10616 left -= error2;
10617
10618 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10619 if (error3 < 0)
10620 return error3;
10621
10622 error += error2 + error3;
10623 if (size && error > size)
10624 return -ERANGE;
10625 return error;
10626 }
10627
nfs4_enable_swap(struct inode * inode)10628 static void nfs4_enable_swap(struct inode *inode)
10629 {
10630 /* The state manager thread must always be running.
10631 * It will notice the client is a swapper, and stay put.
10632 */
10633 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10634
10635 nfs4_schedule_state_manager(clp);
10636 }
10637
nfs4_disable_swap(struct inode * inode)10638 static void nfs4_disable_swap(struct inode *inode)
10639 {
10640 /* The state manager thread will now exit once it is
10641 * woken.
10642 */
10643 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10644
10645 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10646 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10647 wake_up_var(&clp->cl_state);
10648 }
10649
10650 static const struct inode_operations nfs4_dir_inode_operations = {
10651 .create = nfs_create,
10652 .lookup = nfs_lookup,
10653 .atomic_open = nfs_atomic_open,
10654 .link = nfs_link,
10655 .unlink = nfs_unlink,
10656 .symlink = nfs_symlink,
10657 .mkdir = nfs_mkdir,
10658 .rmdir = nfs_rmdir,
10659 .mknod = nfs_mknod,
10660 .rename = nfs_rename,
10661 .permission = nfs_permission,
10662 .getattr = nfs_getattr,
10663 .setattr = nfs_setattr,
10664 .listxattr = nfs4_listxattr,
10665 .fileattr_get = nfs_fileattr_get,
10666 };
10667
10668 static const struct inode_operations nfs4_file_inode_operations = {
10669 .permission = nfs_permission,
10670 .getattr = nfs_getattr,
10671 .setattr = nfs_setattr,
10672 .listxattr = nfs4_listxattr,
10673 .fileattr_get = nfs_fileattr_get,
10674 };
10675
nfs4_clone_server(struct nfs_server * source,struct nfs_fh * fh,struct nfs_fattr * fattr,rpc_authflavor_t flavor)10676 static struct nfs_server *nfs4_clone_server(struct nfs_server *source,
10677 struct nfs_fh *fh, struct nfs_fattr *fattr,
10678 rpc_authflavor_t flavor)
10679 {
10680 struct nfs_server *server;
10681 int error;
10682
10683 server = nfs_clone_server(source, fh, fattr, flavor);
10684 if (IS_ERR(server))
10685 return server;
10686
10687 nfs4_session_limit_rwsize(server);
10688 nfs4_session_limit_xasize(server);
10689
10690 error = nfs4_delegation_hash_alloc(server);
10691 if (error) {
10692 nfs_free_server(server);
10693 return ERR_PTR(error);
10694 }
10695
10696 return server;
10697 }
10698
10699 const struct nfs_rpc_ops nfs_v4_clientops = {
10700 .version = 4, /* protocol version */
10701 .dentry_ops = &nfs4_dentry_operations,
10702 .dir_inode_ops = &nfs4_dir_inode_operations,
10703 .file_inode_ops = &nfs4_file_inode_operations,
10704 .file_ops = &nfs4_file_operations,
10705 .getroot = nfs4_proc_get_root,
10706 .submount = nfs4_submount,
10707 .try_get_tree = nfs4_try_get_tree,
10708 .getattr = nfs4_proc_getattr,
10709 .setattr = nfs4_proc_setattr,
10710 .lookup = nfs4_proc_lookup,
10711 .lookupp = nfs4_proc_lookupp,
10712 .access = nfs4_proc_access,
10713 .readlink = nfs4_proc_readlink,
10714 .create = nfs4_proc_create,
10715 .remove = nfs4_proc_remove,
10716 .unlink_setup = nfs4_proc_unlink_setup,
10717 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10718 .unlink_done = nfs4_proc_unlink_done,
10719 .rename_setup = nfs4_proc_rename_setup,
10720 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10721 .rename_done = nfs4_proc_rename_done,
10722 .link = nfs4_proc_link,
10723 .symlink = nfs4_proc_symlink,
10724 .mkdir = nfs4_proc_mkdir,
10725 .rmdir = nfs4_proc_rmdir,
10726 .readdir = nfs4_proc_readdir,
10727 .mknod = nfs4_proc_mknod,
10728 .statfs = nfs4_proc_statfs,
10729 .fsinfo = nfs4_proc_fsinfo,
10730 .pathconf = nfs4_proc_pathconf,
10731 .set_capabilities = nfs4_server_capabilities,
10732 .decode_dirent = nfs4_decode_dirent,
10733 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10734 .read_setup = nfs4_proc_read_setup,
10735 .read_done = nfs4_read_done,
10736 .write_setup = nfs4_proc_write_setup,
10737 .write_done = nfs4_write_done,
10738 .commit_setup = nfs4_proc_commit_setup,
10739 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10740 .commit_done = nfs4_commit_done,
10741 .lock = nfs4_proc_lock,
10742 .clear_acl_cache = nfs4_zap_acl_attr,
10743 .close_context = nfs4_close_context,
10744 .open_context = nfs4_atomic_open,
10745 .have_delegation = nfs4_have_delegation,
10746 .return_delegation = nfs4_inode_return_delegation,
10747 .alloc_client = nfs4_alloc_client,
10748 .init_client = nfs4_init_client,
10749 .free_client = nfs4_free_client,
10750 .create_server = nfs4_create_server,
10751 .clone_server = nfs4_clone_server,
10752 .discover_trunking = nfs4_discover_trunking,
10753 .enable_swap = nfs4_enable_swap,
10754 .disable_swap = nfs4_disable_swap,
10755 };
10756
10757 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10758 .name = XATTR_NAME_NFSV4_ACL,
10759 .list = nfs4_xattr_list_nfs4_acl,
10760 .get = nfs4_xattr_get_nfs4_acl,
10761 .set = nfs4_xattr_set_nfs4_acl,
10762 };
10763
10764 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10765 .name = XATTR_NAME_NFSV4_DACL,
10766 .list = nfs4_xattr_list_nfs4_dacl,
10767 .get = nfs4_xattr_get_nfs4_dacl,
10768 .set = nfs4_xattr_set_nfs4_dacl,
10769 };
10770
10771 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10772 .name = XATTR_NAME_NFSV4_SACL,
10773 .list = nfs4_xattr_list_nfs4_sacl,
10774 .get = nfs4_xattr_get_nfs4_sacl,
10775 .set = nfs4_xattr_set_nfs4_sacl,
10776 };
10777
10778 #ifdef CONFIG_NFS_V4_2
10779 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10780 .prefix = XATTR_USER_PREFIX,
10781 .get = nfs4_xattr_get_nfs4_user,
10782 .set = nfs4_xattr_set_nfs4_user,
10783 };
10784 #endif
10785
10786 const struct xattr_handler * const nfs4_xattr_handlers[] = {
10787 &nfs4_xattr_nfs4_acl_handler,
10788 &nfs4_xattr_nfs4_dacl_handler,
10789 &nfs4_xattr_nfs4_sacl_handler,
10790 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10791 &nfs4_xattr_nfs4_label_handler,
10792 #endif
10793 #ifdef CONFIG_NFS_V4_2
10794 &nfs4_xattr_nfs4_user_handler,
10795 #endif
10796 NULL
10797 };
10798