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 FATTR4_WORD2_UNCACHEABLE_FILE_DATA
229 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
230 | FATTR4_WORD2_SECURITY_LABEL
231 #endif
232 };
233
234 static const u32 nfs4_pnfs_open_bitmap[3] = {
235 FATTR4_WORD0_TYPE
236 | FATTR4_WORD0_CHANGE
237 | FATTR4_WORD0_SIZE
238 | FATTR4_WORD0_FSID
239 | FATTR4_WORD0_FILEID,
240 FATTR4_WORD1_MODE
241 | FATTR4_WORD1_NUMLINKS
242 | FATTR4_WORD1_OWNER
243 | FATTR4_WORD1_OWNER_GROUP
244 | FATTR4_WORD1_RAWDEV
245 | FATTR4_WORD1_SPACE_USED
246 | FATTR4_WORD1_TIME_ACCESS
247 | FATTR4_WORD1_TIME_CREATE
248 | FATTR4_WORD1_TIME_METADATA
249 | FATTR4_WORD1_TIME_MODIFY,
250 FATTR4_WORD2_MDSTHRESHOLD
251 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
252 | FATTR4_WORD2_SECURITY_LABEL
253 #endif
254 | FATTR4_WORD2_UNCACHEABLE_FILE_DATA
255 };
256
257 static const u32 nfs4_open_noattr_bitmap[3] = {
258 FATTR4_WORD0_TYPE
259 | FATTR4_WORD0_FILEID,
260 };
261
262 const u32 nfs4_statfs_bitmap[3] = {
263 FATTR4_WORD0_FILES_AVAIL
264 | FATTR4_WORD0_FILES_FREE
265 | FATTR4_WORD0_FILES_TOTAL,
266 FATTR4_WORD1_SPACE_AVAIL
267 | FATTR4_WORD1_SPACE_FREE
268 | FATTR4_WORD1_SPACE_TOTAL
269 };
270
271 const u32 nfs4_pathconf_bitmap[3] = {
272 FATTR4_WORD0_MAXLINK
273 | FATTR4_WORD0_MAXNAME,
274 0
275 };
276
277 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
278 | FATTR4_WORD0_MAXREAD
279 | FATTR4_WORD0_MAXWRITE
280 | FATTR4_WORD0_LEASE_TIME,
281 FATTR4_WORD1_TIME_DELTA
282 | FATTR4_WORD1_FS_LAYOUT_TYPES,
283 FATTR4_WORD2_LAYOUT_BLKSIZE
284 | FATTR4_WORD2_CLONE_BLKSIZE
285 | FATTR4_WORD2_CHANGE_ATTR_TYPE
286 | FATTR4_WORD2_XATTR_SUPPORT
287 };
288
289 const u32 nfs4_fs_locations_bitmap[3] = {
290 FATTR4_WORD0_CHANGE
291 | FATTR4_WORD0_SIZE
292 | FATTR4_WORD0_FSID
293 | FATTR4_WORD0_FILEID
294 | FATTR4_WORD0_FS_LOCATIONS,
295 FATTR4_WORD1_OWNER
296 | FATTR4_WORD1_OWNER_GROUP
297 | FATTR4_WORD1_RAWDEV
298 | FATTR4_WORD1_SPACE_USED
299 | FATTR4_WORD1_TIME_ACCESS
300 | FATTR4_WORD1_TIME_METADATA
301 | FATTR4_WORD1_TIME_MODIFY
302 | FATTR4_WORD1_MOUNTED_ON_FILEID,
303 };
304
nfs4_bitmap_copy_adjust(__u32 * dst,const __u32 * src,struct inode * inode,unsigned long flags)305 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
306 struct inode *inode, unsigned long flags)
307 {
308 unsigned long cache_validity;
309
310 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
311 /*
312 * The uncacheable_file_data attribute applies only to regular files
313 * (NF4REG); a server must reject a query of it on any other object
314 * type with NFS4ERR_INVAL. Never request it unless the target is
315 * known to be a regular file (callers with an unknown object type,
316 * e.g. LOOKUP, pass a NULL inode).
317 */
318 if (!inode || !S_ISREG(inode->i_mode))
319 dst[2] &= ~FATTR4_WORD2_UNCACHEABLE_FILE_DATA;
320 if (!inode || !nfs_have_read_or_write_delegation(inode))
321 return;
322
323 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
324
325 /* Remove the attributes over which we have full control */
326 dst[1] &= ~FATTR4_WORD1_RAWDEV;
327 if (!(cache_validity & NFS_INO_INVALID_SIZE))
328 dst[0] &= ~FATTR4_WORD0_SIZE;
329
330 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
331 dst[0] &= ~FATTR4_WORD0_CHANGE;
332
333 if (!(cache_validity & NFS_INO_INVALID_MODE))
334 dst[1] &= ~FATTR4_WORD1_MODE;
335 if (!(cache_validity & NFS_INO_INVALID_OTHER))
336 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
337
338 if (!(cache_validity & NFS_INO_INVALID_BTIME))
339 dst[1] &= ~FATTR4_WORD1_TIME_CREATE;
340
341 if (!(cache_validity & NFS_INO_INVALID_UNCACHEABLE_FILE_DATA))
342 dst[2] &= ~FATTR4_WORD2_UNCACHEABLE_FILE_DATA;
343
344 if (nfs_have_delegated_mtime(inode)) {
345 if (!(cache_validity & NFS_INO_INVALID_ATIME))
346 dst[1] &= ~(FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET);
347 if (!(cache_validity & NFS_INO_INVALID_MTIME))
348 dst[1] &= ~(FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET);
349 if (!(cache_validity & NFS_INO_INVALID_CTIME))
350 dst[1] &= ~(FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY_SET);
351 } else if (nfs_have_delegated_atime(inode)) {
352 if (!(cache_validity & NFS_INO_INVALID_ATIME))
353 dst[1] &= ~(FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET);
354 }
355 }
356
nfs4_setup_readdir(u64 cookie,__be32 * verifier,struct dentry * dentry,struct nfs4_readdir_arg * readdir)357 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
358 struct nfs4_readdir_arg *readdir)
359 {
360 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
361 __be32 *start, *p;
362
363 if (cookie > 2) {
364 readdir->cookie = cookie;
365 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
366 return;
367 }
368
369 readdir->cookie = 0;
370 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
371 if (cookie == 2)
372 return;
373
374 /*
375 * NFSv4 servers do not return entries for '.' and '..'
376 * Therefore, we fake these entries here. We let '.'
377 * have cookie 0 and '..' have cookie 1. Note that
378 * when talking to the server, we always send cookie 0
379 * instead of 1 or 2.
380 */
381 start = p = kmap_atomic(*readdir->pages);
382
383 if (cookie == 0) {
384 *p++ = xdr_one; /* next */
385 *p++ = xdr_zero; /* cookie, first word */
386 *p++ = xdr_one; /* cookie, second word */
387 *p++ = xdr_one; /* entry len */
388 memcpy(p, ".\0\0\0", 4); /* entry */
389 p++;
390 *p++ = xdr_one; /* bitmap length */
391 *p++ = htonl(attrs); /* bitmap */
392 *p++ = htonl(12); /* attribute buffer length */
393 *p++ = htonl(NF4DIR);
394 p = xdr_encode_hyper(p, d_inode(dentry)->i_ino);
395 }
396
397 *p++ = xdr_one; /* next */
398 *p++ = xdr_zero; /* cookie, first word */
399 *p++ = xdr_two; /* cookie, second word */
400 *p++ = xdr_two; /* entry len */
401 memcpy(p, "..\0\0", 4); /* entry */
402 p++;
403 *p++ = xdr_one; /* bitmap length */
404 *p++ = htonl(attrs); /* bitmap */
405 *p++ = htonl(12); /* attribute buffer length */
406 *p++ = htonl(NF4DIR);
407 spin_lock(&dentry->d_lock);
408 p = xdr_encode_hyper(p, d_inode(dentry->d_parent)->i_ino);
409 spin_unlock(&dentry->d_lock);
410
411 readdir->pgbase = (char *)p - (char *)start;
412 readdir->count -= readdir->pgbase;
413 kunmap_atomic(start);
414 }
415
nfs4_fattr_set_prechange(struct nfs_fattr * fattr,u64 version)416 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
417 {
418 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
419 fattr->pre_change_attr = version;
420 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
421 }
422 }
423
nfs4_test_and_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)424 static void nfs4_test_and_free_stateid(struct nfs_server *server,
425 nfs4_stateid *stateid,
426 const struct cred *cred)
427 {
428 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
429
430 ops->test_and_free_expired(server, stateid, cred);
431 }
432
__nfs4_free_revoked_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)433 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
434 nfs4_stateid *stateid,
435 const struct cred *cred)
436 {
437 stateid->type = NFS4_REVOKED_STATEID_TYPE;
438 nfs4_test_and_free_stateid(server, stateid, cred);
439 }
440
nfs4_free_revoked_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)441 static void nfs4_free_revoked_stateid(struct nfs_server *server,
442 const nfs4_stateid *stateid,
443 const struct cred *cred)
444 {
445 nfs4_stateid tmp;
446
447 nfs4_stateid_copy(&tmp, stateid);
448 __nfs4_free_revoked_stateid(server, &tmp, cred);
449 }
450
nfs4_update_delay(long * timeout)451 static long nfs4_update_delay(long *timeout)
452 {
453 long ret;
454 if (!timeout)
455 return NFS4_POLL_RETRY_MAX;
456 if (*timeout <= 0)
457 *timeout = NFS4_POLL_RETRY_MIN;
458 if (*timeout > NFS4_POLL_RETRY_MAX)
459 *timeout = NFS4_POLL_RETRY_MAX;
460 ret = *timeout;
461 *timeout <<= 1;
462 return ret;
463 }
464
nfs4_delay_killable(long * timeout)465 static int nfs4_delay_killable(long *timeout)
466 {
467 might_sleep();
468
469 if (unlikely(nfs_current_task_exiting()))
470 return -EINTR;
471 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
472 schedule_timeout(nfs4_update_delay(timeout));
473 if (!__fatal_signal_pending(current))
474 return 0;
475 return -EINTR;
476 }
477
nfs4_delay_interruptible(long * timeout)478 static int nfs4_delay_interruptible(long *timeout)
479 {
480 might_sleep();
481
482 if (unlikely(nfs_current_task_exiting()))
483 return -EINTR;
484 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
485 schedule_timeout(nfs4_update_delay(timeout));
486 if (!signal_pending(current))
487 return 0;
488 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
489 }
490
nfs4_delay(long * timeout,bool interruptible)491 static int nfs4_delay(long *timeout, bool interruptible)
492 {
493 if (interruptible)
494 return nfs4_delay_interruptible(timeout);
495 return nfs4_delay_killable(timeout);
496 }
497
498 static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid * stateid)499 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
500 {
501 if (!stateid)
502 return NULL;
503 switch (stateid->type) {
504 case NFS4_OPEN_STATEID_TYPE:
505 case NFS4_LOCK_STATEID_TYPE:
506 case NFS4_DELEGATION_STATEID_TYPE:
507 return stateid;
508 default:
509 break;
510 }
511 return NULL;
512 }
513
514 /* This is the error handling routine for processes that are allowed
515 * to sleep.
516 */
nfs4_do_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)517 static int nfs4_do_handle_exception(struct nfs_server *server,
518 int errorcode, struct nfs4_exception *exception)
519 {
520 struct nfs_client *clp = server->nfs_client;
521 struct nfs4_state *state = exception->state;
522 const nfs4_stateid *stateid;
523 struct inode *inode = exception->inode;
524 int ret = errorcode;
525
526 exception->delay = 0;
527 exception->recovering = 0;
528 exception->retry = 0;
529
530 stateid = nfs4_recoverable_stateid(exception->stateid);
531 if (stateid == NULL && state != NULL)
532 stateid = nfs4_recoverable_stateid(&state->stateid);
533
534 switch(errorcode) {
535 case 0:
536 return 0;
537 case -NFS4ERR_BADHANDLE:
538 case -ESTALE:
539 if (inode != NULL && S_ISREG(inode->i_mode))
540 pnfs_destroy_layout(NFS_I(inode));
541 break;
542 case -NFS4ERR_DELEG_REVOKED:
543 case -NFS4ERR_ADMIN_REVOKED:
544 case -NFS4ERR_EXPIRED:
545 case -NFS4ERR_BAD_STATEID:
546 case -NFS4ERR_PARTNER_NO_AUTH:
547 if (inode != NULL && stateid != NULL) {
548 nfs_inode_find_state_and_recover(inode,
549 stateid);
550 goto wait_on_recovery;
551 }
552 fallthrough;
553 case -NFS4ERR_OPENMODE:
554 if (inode) {
555 int err;
556
557 err = nfs_async_inode_return_delegation(inode,
558 stateid);
559 if (err == 0)
560 goto wait_on_recovery;
561 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
562 exception->retry = 1;
563 break;
564 }
565 }
566 if (state == NULL)
567 break;
568 ret = nfs4_schedule_stateid_recovery(server, state);
569 if (ret < 0)
570 break;
571 goto wait_on_recovery;
572 case -NFS4ERR_STALE_STATEID:
573 case -NFS4ERR_STALE_CLIENTID:
574 nfs4_schedule_lease_recovery(clp);
575 goto wait_on_recovery;
576 case -NFS4ERR_MOVED:
577 ret = nfs4_schedule_migration_recovery(server);
578 if (ret < 0)
579 break;
580 goto wait_on_recovery;
581 case -NFS4ERR_LEASE_MOVED:
582 nfs4_schedule_lease_moved_recovery(clp);
583 goto wait_on_recovery;
584 case -NFS4ERR_BADSESSION:
585 case -NFS4ERR_BADSLOT:
586 case -NFS4ERR_BAD_HIGH_SLOT:
587 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
588 case -NFS4ERR_DEADSESSION:
589 case -NFS4ERR_SEQ_FALSE_RETRY:
590 case -NFS4ERR_SEQ_MISORDERED:
591 /* Handled in nfs41_sequence_process() */
592 goto wait_on_recovery;
593 case -NFS4ERR_FILE_OPEN:
594 if (exception->timeout > HZ) {
595 /* We have retried a decent amount, time to
596 * fail
597 */
598 ret = -EBUSY;
599 break;
600 }
601 fallthrough;
602 case -NFS4ERR_DELAY:
603 nfs_inc_server_stats(server, NFSIOS_DELAY);
604 fallthrough;
605 case -NFS4ERR_GRACE:
606 case -NFS4ERR_LAYOUTTRYLATER:
607 case -NFS4ERR_RECALLCONFLICT:
608 case -NFS4ERR_RETURNCONFLICT:
609 exception->delay = 1;
610 return 0;
611
612 case -NFS4ERR_RETRY_UNCACHED_REP:
613 case -NFS4ERR_OLD_STATEID:
614 exception->retry = 1;
615 break;
616 case -NFS4ERR_BADOWNER:
617 /* The following works around a Linux server bug! */
618 case -NFS4ERR_BADNAME:
619 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
620 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
621 exception->retry = 1;
622 printk(KERN_WARNING "NFS: v4 server %s "
623 "does not accept raw "
624 "uid/gids. "
625 "Reenabling the idmapper.\n",
626 server->nfs_client->cl_hostname);
627 }
628 }
629 /* We failed to handle the error */
630 return nfs4_map_errors(ret);
631 wait_on_recovery:
632 exception->recovering = 1;
633 return 0;
634 }
635
636 /*
637 * Track the number of NFS4ERR_DELAY related retransmissions and return
638 * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
639 * set by 'nfs_delay_retrans'.
640 */
nfs4_exception_should_retrans(const struct nfs_server * server,struct nfs4_exception * exception)641 static int nfs4_exception_should_retrans(const struct nfs_server *server,
642 struct nfs4_exception *exception)
643 {
644 if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
645 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
646 return -EAGAIN;
647 }
648 return 0;
649 }
650
651 /* This is the error handling routine for processes that are allowed
652 * to sleep.
653 */
nfs4_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)654 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
655 {
656 struct nfs_client *clp = server->nfs_client;
657 int ret;
658
659 ret = nfs4_do_handle_exception(server, errorcode, exception);
660 if (exception->delay) {
661 int ret2 = nfs4_exception_should_retrans(server, exception);
662 if (ret2 < 0) {
663 exception->retry = 0;
664 return ret2;
665 }
666 ret = nfs4_delay(&exception->timeout,
667 exception->interruptible);
668 goto out_retry;
669 }
670 if (exception->recovering) {
671 if (exception->task_is_privileged)
672 return -EDEADLOCK;
673 ret = nfs4_wait_clnt_recover(clp);
674 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
675 return -EIO;
676 goto out_retry;
677 }
678 return ret;
679 out_retry:
680 if (ret == 0)
681 exception->retry = 1;
682 return ret;
683 }
684
685 static int
nfs4_async_handle_exception(struct rpc_task * task,struct nfs_server * server,int errorcode,struct nfs4_exception * exception)686 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
687 int errorcode, struct nfs4_exception *exception)
688 {
689 struct nfs_client *clp = server->nfs_client;
690 int ret;
691
692 if ((task->tk_rpc_status == -ENETDOWN ||
693 task->tk_rpc_status == -ENETUNREACH) &&
694 task->tk_flags & RPC_TASK_NETUNREACH_FATAL) {
695 exception->delay = 0;
696 exception->recovering = 0;
697 exception->retry = 0;
698 return -EIO;
699 }
700
701 ret = nfs4_do_handle_exception(server, errorcode, exception);
702 if (exception->delay) {
703 int ret2 = nfs4_exception_should_retrans(server, exception);
704 if (ret2 < 0) {
705 exception->retry = 0;
706 return ret2;
707 }
708 rpc_delay(task, nfs4_update_delay(&exception->timeout));
709 goto out_retry;
710 }
711 if (exception->recovering) {
712 if (exception->task_is_privileged)
713 return -EDEADLOCK;
714 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
715 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
716 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
717 goto out_retry;
718 }
719 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
720 ret = -EIO;
721 return ret;
722 out_retry:
723 if (ret == 0) {
724 exception->retry = 1;
725 /*
726 * For NFS4ERR_MOVED, the client transport will need to
727 * be recomputed after migration recovery has completed.
728 */
729 if (errorcode == -NFS4ERR_MOVED)
730 rpc_task_release_transport(task);
731 }
732 return ret;
733 }
734
735 int
nfs4_async_handle_error(struct rpc_task * task,struct nfs_server * server,struct nfs4_state * state,long * timeout)736 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
737 struct nfs4_state *state, long *timeout)
738 {
739 struct nfs4_exception exception = {
740 .state = state,
741 };
742
743 if (task->tk_status >= 0)
744 return 0;
745 if (timeout)
746 exception.timeout = *timeout;
747 task->tk_status = nfs4_async_handle_exception(task, server,
748 task->tk_status,
749 &exception);
750 if (exception.delay && timeout)
751 *timeout = exception.timeout;
752 if (exception.retry)
753 return -EAGAIN;
754 return 0;
755 }
756
757 /*
758 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
759 * or 'false' otherwise.
760 */
_nfs4_is_integrity_protected(struct nfs_client * clp)761 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
762 {
763 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
764 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
765 }
766
do_renew_lease(struct nfs_client * clp,unsigned long timestamp)767 void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
768 {
769 spin_lock(&clp->cl_lock);
770 if (time_before(clp->cl_last_renewal,timestamp))
771 clp->cl_last_renewal = timestamp;
772 spin_unlock(&clp->cl_lock);
773 }
774
renew_lease(const struct nfs_server * server,unsigned long timestamp)775 void renew_lease(const struct nfs_server *server, unsigned long timestamp)
776 {
777 struct nfs_client *clp = server->nfs_client;
778
779 if (!nfs4_has_session(clp))
780 do_renew_lease(clp, timestamp);
781 }
782
nfs4_init_sequence(struct nfs_client * clp,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply,int privileged)783 void nfs4_init_sequence(struct nfs_client *clp,
784 struct nfs4_sequence_args *args,
785 struct nfs4_sequence_res *res, int cache_reply,
786 int privileged)
787 {
788 args->sa_slot = NULL;
789 args->sa_cache_this = cache_reply;
790 args->sa_privileged = privileged;
791
792 res->sr_slot = NULL;
793 res->sr_slot_ops = clp->cl_mvops->sequence_slot_ops;
794 }
795
nfs41_release_slot(struct nfs4_slot * slot)796 static void nfs41_release_slot(struct nfs4_slot *slot)
797 {
798 struct nfs4_session *session;
799 struct nfs4_slot_table *tbl;
800 bool send_new_highest_used_slotid = false;
801
802 if (!slot)
803 return;
804 tbl = slot->table;
805 session = tbl->session;
806
807 /* Bump the slot sequence number */
808 if (slot->seq_done)
809 slot->seq_nr++;
810 slot->seq_done = 0;
811
812 spin_lock(&tbl->slot_tbl_lock);
813 /* Be nice to the server: try to ensure that the last transmitted
814 * value for highest_user_slotid <= target_highest_slotid
815 */
816 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
817 send_new_highest_used_slotid = true;
818
819 if (nfs41_wake_and_assign_slot(tbl, slot)) {
820 send_new_highest_used_slotid = false;
821 goto out_unlock;
822 }
823 nfs4_free_slot(tbl, slot);
824
825 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
826 send_new_highest_used_slotid = false;
827 out_unlock:
828 spin_unlock(&tbl->slot_tbl_lock);
829 if (send_new_highest_used_slotid)
830 nfs41_notify_server(session->clp);
831 if (waitqueue_active(&tbl->slot_waitq))
832 wake_up_all(&tbl->slot_waitq);
833 }
834
nfs41_sequence_free_slot(struct nfs4_sequence_res * res)835 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
836 {
837 nfs41_release_slot(res->sr_slot);
838 res->sr_slot = NULL;
839 }
840
nfs4_slot_sequence_record_sent(struct nfs4_slot * slot,u32 seqnr)841 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
842 u32 seqnr)
843 {
844 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
845 slot->seq_nr_highest_sent = seqnr;
846 }
nfs4_slot_sequence_acked(struct nfs4_slot * slot,u32 seqnr)847 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
848 {
849 nfs4_slot_sequence_record_sent(slot, seqnr);
850 slot->seq_nr_last_acked = seqnr;
851 }
852
nfs4_probe_sequence(struct nfs_client * client,const struct cred * cred,struct nfs4_slot * slot)853 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
854 struct nfs4_slot *slot)
855 {
856 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
857 if (!IS_ERR(task))
858 rpc_put_task_async(task);
859 }
860
nfs41_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)861 static int nfs41_sequence_process(struct rpc_task *task,
862 struct nfs4_sequence_res *res)
863 {
864 struct nfs4_session *session;
865 struct nfs4_slot *slot = res->sr_slot;
866 struct nfs_client *clp;
867 int status;
868 int ret = 1;
869
870 if (slot == NULL)
871 goto out_noaction;
872 /* don't increment the sequence number if the task wasn't sent */
873 if (!RPC_WAS_SENT(task) || slot->seq_done)
874 goto out;
875
876 session = slot->table->session;
877 clp = session->clp;
878
879 trace_nfs4_sequence_done(session, res);
880
881 status = res->sr_status;
882 if (task->tk_status == -NFS4ERR_DEADSESSION)
883 status = -NFS4ERR_DEADSESSION;
884
885 /* Check the SEQUENCE operation status */
886 switch (status) {
887 case 0:
888 /* Mark this sequence number as having been acked */
889 nfs4_slot_sequence_acked(slot, slot->seq_nr);
890 /* Update the slot's sequence and clientid lease timer */
891 slot->seq_done = 1;
892 do_renew_lease(clp, res->sr_timestamp);
893 /* Check sequence flags */
894 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
895 !!slot->privileged);
896 nfs41_update_target_slotid(slot->table, slot, res);
897 break;
898 case 1:
899 /*
900 * sr_status remains 1 if an RPC level error occurred.
901 * The server may or may not have processed the sequence
902 * operation..
903 */
904 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
905 slot->seq_done = 1;
906 goto out;
907 case -NFS4ERR_DELAY:
908 /* The server detected a resend of the RPC call and
909 * returned NFS4ERR_DELAY as per Section 2.10.6.2
910 * of RFC5661.
911 */
912 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
913 __func__,
914 slot->slot_nr,
915 slot->seq_nr);
916 goto out_retry;
917 case -NFS4ERR_RETRY_UNCACHED_REP:
918 case -NFS4ERR_SEQ_FALSE_RETRY:
919 /*
920 * The server thinks we tried to replay a request.
921 * Retry the call after bumping the sequence ID.
922 */
923 nfs4_slot_sequence_acked(slot, slot->seq_nr);
924 goto retry_new_seq;
925 case -NFS4ERR_BADSLOT:
926 /*
927 * The slot id we used was probably retired. Try again
928 * using a different slot id.
929 */
930 if (slot->slot_nr < slot->table->target_highest_slotid)
931 goto session_recover;
932 goto retry_nowait;
933 case -NFS4ERR_SEQ_MISORDERED:
934 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
935 /*
936 * Were one or more calls using this slot interrupted?
937 * If the server never received the request, then our
938 * transmitted slot sequence number may be too high. However,
939 * if the server did receive the request then it might
940 * accidentally give us a reply with a mismatched operation.
941 * We can sort this out by sending a lone sequence operation
942 * to the server on the same slot.
943 */
944 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
945 slot->seq_nr--;
946 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
947 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
948 res->sr_slot = NULL;
949 }
950 goto retry_nowait;
951 }
952 /*
953 * RFC5661:
954 * A retry might be sent while the original request is
955 * still in progress on the replier. The replier SHOULD
956 * deal with the issue by returning NFS4ERR_DELAY as the
957 * reply to SEQUENCE or CB_SEQUENCE operation, but
958 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
959 *
960 * Restart the search after a delay.
961 */
962 slot->seq_nr = slot->seq_nr_highest_sent;
963 goto out_retry;
964 case -NFS4ERR_BADSESSION:
965 case -NFS4ERR_DEADSESSION:
966 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
967 goto session_recover;
968 default:
969 /* Just update the slot sequence no. */
970 slot->seq_done = 1;
971 }
972 out:
973 /* The session may be reset by one of the error handlers. */
974 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
975 out_noaction:
976 return ret;
977 session_recover:
978 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
979 nfs4_schedule_session_recovery(session, status);
980 dprintk("%s ERROR: %d Reset session\n", __func__, status);
981 nfs41_sequence_free_slot(res);
982 goto out;
983 retry_new_seq:
984 ++slot->seq_nr;
985 retry_nowait:
986 if (rpc_restart_call_prepare(task)) {
987 nfs41_sequence_free_slot(res);
988 task->tk_status = 0;
989 ret = 0;
990 }
991 goto out;
992 out_retry:
993 if (!rpc_restart_call(task))
994 goto out;
995 rpc_delay(task, NFS4_POLL_RETRY_MAX);
996 return 0;
997 }
998
nfs41_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)999 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1000 {
1001 if (!nfs41_sequence_process(task, res))
1002 return 0;
1003 if (res->sr_slot != NULL)
1004 nfs41_sequence_free_slot(res);
1005 return 1;
1006
1007 }
1008 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
1009
nfs41_call_sync_prepare(struct rpc_task * task,void * calldata)1010 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
1011 {
1012 struct nfs4_call_sync_data *data = calldata;
1013
1014 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1015
1016 nfs4_setup_sequence(data->seq_server->nfs_client,
1017 data->seq_args, data->seq_res, task);
1018 }
1019
nfs41_call_sync_done(struct rpc_task * task,void * calldata)1020 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1021 {
1022 struct nfs4_call_sync_data *data = calldata;
1023
1024 nfs41_sequence_done(task, data->seq_res);
1025 }
1026
1027 static const struct rpc_call_ops nfs41_call_sync_ops = {
1028 .rpc_call_prepare = nfs41_call_sync_prepare,
1029 .rpc_call_done = nfs41_call_sync_done,
1030 };
1031
1032
nfs41_sequence_res_init(struct nfs4_sequence_res * res)1033 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1034 {
1035 res->sr_timestamp = jiffies;
1036 res->sr_status_flags = 0;
1037 res->sr_status = 1;
1038 }
1039
1040 static
nfs4_sequence_attach_slot(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct nfs4_slot * slot)1041 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1042 struct nfs4_sequence_res *res,
1043 struct nfs4_slot *slot)
1044 {
1045 if (!slot)
1046 return;
1047 slot->privileged = args->sa_privileged ? 1 : 0;
1048 args->sa_slot = slot;
1049
1050 res->sr_slot = slot;
1051 }
1052
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1053 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1054 {
1055 if (res->sr_slot != NULL)
1056 res->sr_slot_ops->free_slot(res);
1057 }
1058
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)1059 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1060 {
1061 if (res->sr_slot == NULL)
1062 return 1;
1063 return res->sr_slot_ops->process(task, res);
1064 }
1065
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1066 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1067 {
1068 if (res->sr_slot == NULL)
1069 return 1;
1070 return res->sr_slot_ops->done(task, res);
1071 }
1072 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1073
1074
nfs4_setup_sequence(struct nfs_client * client,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct rpc_task * task)1075 int nfs4_setup_sequence(struct nfs_client *client,
1076 struct nfs4_sequence_args *args,
1077 struct nfs4_sequence_res *res,
1078 struct rpc_task *task)
1079 {
1080 struct nfs4_session *session = nfs4_get_session(client);
1081 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
1082 struct nfs4_slot *slot;
1083
1084 /* slot already allocated? */
1085 if (res->sr_slot != NULL)
1086 goto out_start;
1087
1088 if (session)
1089 tbl = &session->fc_slot_table;
1090
1091 spin_lock(&tbl->slot_tbl_lock);
1092 /* The state manager will wait until the slot table is empty */
1093 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1094 goto out_sleep;
1095
1096 slot = nfs4_alloc_slot(tbl);
1097 if (IS_ERR(slot)) {
1098 if (slot == ERR_PTR(-ENOMEM))
1099 goto out_sleep_timeout;
1100 goto out_sleep;
1101 }
1102 spin_unlock(&tbl->slot_tbl_lock);
1103
1104 nfs4_sequence_attach_slot(args, res, slot);
1105
1106 trace_nfs4_setup_sequence(session, args);
1107 out_start:
1108 nfs41_sequence_res_init(res);
1109 rpc_call_start(task);
1110 return 0;
1111 out_sleep_timeout:
1112 /* Try again in 1/4 second */
1113 if (args->sa_privileged)
1114 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1115 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1116 else
1117 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1118 NULL, jiffies + (HZ >> 2));
1119 spin_unlock(&tbl->slot_tbl_lock);
1120 return -EAGAIN;
1121 out_sleep:
1122 if (args->sa_privileged)
1123 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1124 RPC_PRIORITY_PRIVILEGED);
1125 else
1126 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1127 spin_unlock(&tbl->slot_tbl_lock);
1128 return -EAGAIN;
1129 }
1130 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1131
nfs4_call_sync_custom(struct rpc_task_setup * task_setup)1132 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1133 {
1134 int ret;
1135 struct rpc_task *task;
1136
1137 task = rpc_run_task(task_setup);
1138 if (IS_ERR(task))
1139 return PTR_ERR(task);
1140
1141 ret = task->tk_status;
1142 rpc_put_task(task);
1143 return ret;
1144 }
1145
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)1146 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1147 struct nfs_server *server,
1148 struct rpc_message *msg,
1149 struct nfs4_sequence_args *args,
1150 struct nfs4_sequence_res *res,
1151 unsigned short task_flags)
1152 {
1153 struct nfs_client *clp = server->nfs_client;
1154 struct nfs4_call_sync_data data = {
1155 .seq_server = server,
1156 .seq_args = args,
1157 .seq_res = res,
1158 };
1159 struct rpc_task_setup task_setup = {
1160 .rpc_client = clnt,
1161 .rpc_message = msg,
1162 .callback_ops = clp->cl_mvops->call_sync_ops,
1163 .callback_data = &data,
1164 .flags = task_flags,
1165 };
1166
1167 return nfs4_call_sync_custom(&task_setup);
1168 }
1169
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)1170 int nfs4_call_sync_sequence(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 {
1176 unsigned short task_flags = 0;
1177
1178 if (server->caps & NFS_CAP_MOVEABLE)
1179 task_flags = RPC_TASK_MOVEABLE;
1180 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1181 }
1182
1183
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)1184 int nfs4_call_sync(struct rpc_clnt *clnt,
1185 struct nfs_server *server,
1186 struct rpc_message *msg,
1187 struct nfs4_sequence_args *args,
1188 struct nfs4_sequence_res *res,
1189 int cache_reply)
1190 {
1191 nfs4_init_sequence(server->nfs_client, args, res, cache_reply, 0);
1192 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1193 }
1194
1195 static void
nfs4_inc_nlink_locked(struct inode * inode)1196 nfs4_inc_nlink_locked(struct inode *inode)
1197 {
1198 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1199 NFS_INO_INVALID_CTIME |
1200 NFS_INO_INVALID_NLINK);
1201 inc_nlink(inode);
1202 }
1203
1204 static void
nfs4_inc_nlink(struct inode * inode)1205 nfs4_inc_nlink(struct inode *inode)
1206 {
1207 spin_lock(&inode->i_lock);
1208 nfs4_inc_nlink_locked(inode);
1209 spin_unlock(&inode->i_lock);
1210 }
1211
1212 static void
nfs4_dec_nlink_locked(struct inode * inode)1213 nfs4_dec_nlink_locked(struct inode *inode)
1214 {
1215 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1216 NFS_INO_INVALID_CTIME |
1217 NFS_INO_INVALID_NLINK);
1218 drop_nlink(inode);
1219 }
1220
1221 static void
nfs4_update_changeattr_locked(struct inode * inode,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1222 nfs4_update_changeattr_locked(struct inode *inode,
1223 struct nfs4_change_info *cinfo,
1224 unsigned long timestamp, unsigned long cache_validity)
1225 {
1226 struct nfs_inode *nfsi = NFS_I(inode);
1227 u64 change_attr = inode_peek_iversion_raw(inode);
1228
1229 if (!nfs_have_delegated_mtime(inode))
1230 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1231 if (S_ISDIR(inode->i_mode))
1232 cache_validity |= NFS_INO_INVALID_DATA;
1233
1234 switch (NFS_SERVER(inode)->change_attr_type) {
1235 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1236 if (cinfo->after == change_attr)
1237 goto out;
1238 break;
1239 default:
1240 if ((s64)(change_attr - cinfo->after) >= 0)
1241 goto out;
1242 }
1243
1244 inode_set_iversion_raw(inode, cinfo->after);
1245 if (!cinfo->atomic || cinfo->before != change_attr) {
1246 if (S_ISDIR(inode->i_mode))
1247 nfs_force_lookup_revalidate(inode);
1248
1249 if (!nfs_have_delegated_attributes(inode))
1250 cache_validity |=
1251 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1252 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1253 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1254 NFS_INO_INVALID_MODE | NFS_INO_INVALID_BTIME |
1255 NFS_INO_INVALID_XATTR;
1256 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1257 }
1258 nfsi->attrtimeo_timestamp = jiffies;
1259 nfsi->read_cache_jiffies = timestamp;
1260 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1261 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1262 out:
1263 nfs_set_cache_invalid(inode, cache_validity);
1264 }
1265
1266 void
nfs4_update_changeattr(struct inode * dir,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1267 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1268 unsigned long timestamp, unsigned long cache_validity)
1269 {
1270 spin_lock(&dir->i_lock);
1271 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1272 spin_unlock(&dir->i_lock);
1273 }
1274
1275 struct nfs4_open_createattrs {
1276 struct nfs4_label *label;
1277 struct iattr *sattr;
1278 const __u32 verf[2];
1279 };
1280
nfs4_clear_cap_atomic_open_v1(struct nfs_server * server,int err,struct nfs4_exception * exception)1281 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1282 int err, struct nfs4_exception *exception)
1283 {
1284 if (err != -EINVAL)
1285 return false;
1286 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1287 return false;
1288 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1289 exception->retry = 1;
1290 return true;
1291 }
1292
_nfs4_ctx_to_accessmode(const struct nfs_open_context * ctx)1293 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1294 {
1295 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1296 }
1297
_nfs4_ctx_to_openmode(const struct nfs_open_context * ctx)1298 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1299 {
1300 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1301
1302 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1303 }
1304
1305 static u32
nfs4_fmode_to_share_access(fmode_t fmode)1306 nfs4_fmode_to_share_access(fmode_t fmode)
1307 {
1308 u32 res = 0;
1309
1310 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1311 case FMODE_READ:
1312 res = NFS4_SHARE_ACCESS_READ;
1313 break;
1314 case FMODE_WRITE:
1315 res = NFS4_SHARE_ACCESS_WRITE;
1316 break;
1317 case FMODE_READ|FMODE_WRITE:
1318 res = NFS4_SHARE_ACCESS_BOTH;
1319 }
1320 return res;
1321 }
1322
1323 static u32
nfs4_map_atomic_open_share(struct nfs_server * server,fmode_t fmode,int openflags)1324 nfs4_map_atomic_open_share(struct nfs_server *server,
1325 fmode_t fmode, int openflags)
1326 {
1327 u32 res = nfs4_fmode_to_share_access(fmode);
1328
1329 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1330 goto out;
1331 /* Want no delegation if we're using O_DIRECT */
1332 if (openflags & O_DIRECT) {
1333 res |= NFS4_SHARE_WANT_NO_DELEG;
1334 goto out;
1335 }
1336 /* res |= NFS4_SHARE_WANT_NO_PREFERENCE; */
1337 if (server->caps & NFS_CAP_DELEGTIME)
1338 res |= NFS4_SHARE_WANT_DELEG_TIMESTAMPS;
1339 if (server->caps & NFS_CAP_OPEN_XOR)
1340 res |= NFS4_SHARE_WANT_OPEN_XOR_DELEGATION;
1341 out:
1342 return res;
1343 }
1344
1345 static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server * server,enum open_claim_type4 claim)1346 nfs4_map_atomic_open_claim(struct nfs_server *server,
1347 enum open_claim_type4 claim)
1348 {
1349 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1350 return claim;
1351 switch (claim) {
1352 default:
1353 return claim;
1354 case NFS4_OPEN_CLAIM_FH:
1355 return NFS4_OPEN_CLAIM_NULL;
1356 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1357 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1358 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1359 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1360 }
1361 }
1362
nfs4_init_opendata_res(struct nfs4_opendata * p)1363 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1364 {
1365 p->o_res.f_attr = &p->f_attr;
1366 p->o_res.seqid = p->o_arg.seqid;
1367 p->c_res.seqid = p->c_arg.seqid;
1368 p->o_res.server = p->o_arg.server;
1369 p->o_res.access_request = p->o_arg.access;
1370 nfs_fattr_init(&p->f_attr);
1371 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1372 }
1373
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)1374 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1375 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1376 const struct nfs4_open_createattrs *c,
1377 enum open_claim_type4 claim,
1378 gfp_t gfp_mask)
1379 {
1380 struct dentry *parent = dget_parent(dentry);
1381 struct inode *dir = d_inode(parent);
1382 struct nfs_server *server = NFS_SERVER(dir);
1383 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1384 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1385 struct nfs4_opendata *p;
1386
1387 p = kzalloc_obj(*p, gfp_mask);
1388 if (p == NULL)
1389 goto err;
1390
1391 p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1392 if (IS_ERR(p->f_attr.label))
1393 goto err_free_p;
1394
1395 p->a_label = nfs4_label_alloc(server, gfp_mask);
1396 if (IS_ERR(p->a_label))
1397 goto err_free_f;
1398
1399 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1400 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1401 if (IS_ERR(p->o_arg.seqid))
1402 goto err_free_label;
1403 nfs_sb_active(dentry->d_sb);
1404 p->dentry = dget(dentry);
1405 p->dir = parent;
1406 p->owner = sp;
1407 atomic_inc(&sp->so_count);
1408 p->o_arg.open_flags = flags;
1409 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1410 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1411 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1412 fmode, flags);
1413 if (flags & O_CREAT) {
1414 p->o_arg.umask = current_umask();
1415 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1416 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1417 p->o_arg.u.attrs = &p->attrs;
1418 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1419
1420 memcpy(p->o_arg.u.verifier.data, c->verf,
1421 sizeof(p->o_arg.u.verifier.data));
1422 }
1423 }
1424 /* ask server to check for all possible rights as results
1425 * are cached */
1426 switch (p->o_arg.claim) {
1427 default:
1428 break;
1429 case NFS4_OPEN_CLAIM_NULL:
1430 case NFS4_OPEN_CLAIM_FH:
1431 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1432 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1433 NFS4_ACCESS_EXECUTE |
1434 nfs_access_xattr_mask(server);
1435 }
1436 p->o_arg.clientid = server->nfs_client->cl_clientid;
1437 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1438 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1439 p->o_arg.name = &dentry->d_name;
1440 p->o_arg.server = server;
1441 p->o_arg.bitmask = nfs4_bitmask(server, label);
1442 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1443 switch (p->o_arg.claim) {
1444 case NFS4_OPEN_CLAIM_NULL:
1445 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1446 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1447 p->o_arg.fh = NFS_FH(dir);
1448 break;
1449 case NFS4_OPEN_CLAIM_PREVIOUS:
1450 case NFS4_OPEN_CLAIM_FH:
1451 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1452 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1453 p->o_arg.fh = NFS_FH(d_inode(dentry));
1454 }
1455 p->c_arg.fh = &p->o_res.fh;
1456 p->c_arg.stateid = &p->o_res.stateid;
1457 p->c_arg.seqid = p->o_arg.seqid;
1458 nfs4_init_opendata_res(p);
1459 kref_init(&p->kref);
1460 return p;
1461
1462 err_free_label:
1463 nfs4_label_free(p->a_label);
1464 err_free_f:
1465 nfs4_label_free(p->f_attr.label);
1466 err_free_p:
1467 kfree(p);
1468 err:
1469 dput(parent);
1470 return NULL;
1471 }
1472
nfs4_opendata_free(struct kref * kref)1473 static void nfs4_opendata_free(struct kref *kref)
1474 {
1475 struct nfs4_opendata *p = container_of(kref,
1476 struct nfs4_opendata, kref);
1477 struct super_block *sb = p->dentry->d_sb;
1478
1479 nfs4_lgopen_release(p->lgp);
1480 nfs_free_seqid(p->o_arg.seqid);
1481 nfs4_sequence_free_slot(&p->o_res.seq_res);
1482 if (p->state != NULL)
1483 nfs4_put_open_state(p->state);
1484 nfs4_put_state_owner(p->owner);
1485
1486 nfs4_label_free(p->a_label);
1487 nfs4_label_free(p->f_attr.label);
1488
1489 dput(p->dir);
1490 dput(p->dentry);
1491 nfs_sb_deactive(sb);
1492 nfs_fattr_free_names(&p->f_attr);
1493 kfree(p->f_attr.mdsthreshold);
1494 kfree(p);
1495 }
1496
nfs4_opendata_put(struct nfs4_opendata * p)1497 static void nfs4_opendata_put(struct nfs4_opendata *p)
1498 {
1499 if (p != NULL)
1500 kref_put(&p->kref, nfs4_opendata_free);
1501 }
1502
nfs4_mode_match_open_stateid(struct nfs4_state * state,fmode_t fmode)1503 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1504 fmode_t fmode)
1505 {
1506 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1507 case FMODE_READ|FMODE_WRITE:
1508 return state->n_rdwr != 0;
1509 case FMODE_WRITE:
1510 return state->n_wronly != 0;
1511 case FMODE_READ:
1512 return state->n_rdonly != 0;
1513 }
1514 WARN_ON_ONCE(1);
1515 return false;
1516 }
1517
can_open_cached(struct nfs4_state * state,fmode_t mode,int open_mode,enum open_claim_type4 claim)1518 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1519 int open_mode, enum open_claim_type4 claim)
1520 {
1521 int ret = 0;
1522
1523 if (open_mode & (O_EXCL|O_TRUNC))
1524 goto out;
1525 switch (claim) {
1526 case NFS4_OPEN_CLAIM_NULL:
1527 case NFS4_OPEN_CLAIM_FH:
1528 goto out;
1529 default:
1530 break;
1531 }
1532 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1533 case FMODE_READ:
1534 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1535 && state->n_rdonly != 0;
1536 break;
1537 case FMODE_WRITE:
1538 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1539 && state->n_wronly != 0;
1540 break;
1541 case FMODE_READ|FMODE_WRITE:
1542 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1543 && state->n_rdwr != 0;
1544 }
1545 out:
1546 return ret;
1547 }
1548
can_open_delegated(const struct inode * inode,fmode_t fmode,enum open_claim_type4 claim,nfs4_stateid * stateid)1549 static bool can_open_delegated(const struct inode *inode, fmode_t fmode,
1550 enum open_claim_type4 claim, nfs4_stateid *stateid)
1551 {
1552 struct nfs_delegation *delegation;
1553 bool ret = false;
1554
1555 delegation = nfs4_get_valid_delegation(inode);
1556 if (!delegation)
1557 return false;
1558 if ((delegation->type & fmode) != fmode)
1559 goto out_put_delegation;
1560
1561 switch (claim) {
1562 case NFS4_OPEN_CLAIM_PREVIOUS:
1563 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1564 break;
1565 fallthrough;
1566 case NFS4_OPEN_CLAIM_NULL:
1567 case NFS4_OPEN_CLAIM_FH:
1568 nfs_mark_delegation_referenced(delegation);
1569 /* Save the delegation stateid */
1570 if (stateid)
1571 nfs4_stateid_copy(stateid, &delegation->stateid);
1572 ret = true;
1573 break;
1574 default:
1575 break;
1576 }
1577
1578 out_put_delegation:
1579 nfs_put_delegation(delegation);
1580 return ret;
1581 }
1582
update_open_stateflags(struct nfs4_state * state,fmode_t fmode)1583 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1584 {
1585 switch (fmode) {
1586 case FMODE_WRITE:
1587 state->n_wronly++;
1588 break;
1589 case FMODE_READ:
1590 state->n_rdonly++;
1591 break;
1592 case FMODE_READ|FMODE_WRITE:
1593 state->n_rdwr++;
1594 }
1595 nfs4_state_set_mode_locked(state, state->state | fmode);
1596 }
1597
nfs_open_stateid_recover_openmode(struct nfs4_state * state)1598 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1599 {
1600 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1601 return true;
1602 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1603 return true;
1604 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1605 return true;
1606 return false;
1607 }
1608
nfs_state_log_update_open_stateid(struct nfs4_state * state)1609 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1610 {
1611 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1612 wake_up_all(&state->waitq);
1613 }
1614
nfs_test_and_clear_all_open_stateid(struct nfs4_state * state)1615 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1616 {
1617 struct nfs_client *clp = state->owner->so_server->nfs_client;
1618 bool need_recover = false;
1619
1620 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1621 need_recover = true;
1622 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1623 need_recover = true;
1624 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1625 need_recover = true;
1626 if (need_recover)
1627 nfs4_state_mark_reclaim_nograce(clp, state);
1628 }
1629
1630 /*
1631 * Check for whether or not the caller may update the open stateid
1632 * to the value passed in by stateid.
1633 *
1634 * Note: This function relies heavily on the server implementing
1635 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1636 * correctly.
1637 * i.e. The stateid seqids have to be initialised to 1, and
1638 * are then incremented on every state transition.
1639 */
nfs_stateid_is_sequential(struct nfs4_state * state,const nfs4_stateid * stateid)1640 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1641 const nfs4_stateid *stateid)
1642 {
1643 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1644 /* The common case - we're updating to a new sequence number */
1645 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1646 if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1647 return true;
1648 return false;
1649 }
1650 /* The server returned a new stateid */
1651 }
1652 /* This is the first OPEN in this generation */
1653 if (stateid->seqid == cpu_to_be32(1))
1654 return true;
1655 return false;
1656 }
1657
nfs_resync_open_stateid_locked(struct nfs4_state * state)1658 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1659 {
1660 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1661 return;
1662 if (state->n_wronly)
1663 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1664 if (state->n_rdonly)
1665 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1666 if (state->n_rdwr)
1667 set_bit(NFS_O_RDWR_STATE, &state->flags);
1668 set_bit(NFS_OPEN_STATE, &state->flags);
1669 }
1670
nfs_clear_open_stateid_locked(struct nfs4_state * state,nfs4_stateid * stateid,fmode_t fmode)1671 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1672 nfs4_stateid *stateid, fmode_t fmode)
1673 {
1674 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1675 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1676 case FMODE_WRITE:
1677 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1678 break;
1679 case FMODE_READ:
1680 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1681 break;
1682 case 0:
1683 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1684 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1685 clear_bit(NFS_OPEN_STATE, &state->flags);
1686 }
1687 if (stateid == NULL)
1688 return;
1689 /* Handle OPEN+OPEN_DOWNGRADE races */
1690 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1691 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1692 nfs_resync_open_stateid_locked(state);
1693 goto out;
1694 }
1695 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1696 nfs4_stateid_copy(&state->stateid, stateid);
1697 nfs4_stateid_copy(&state->open_stateid, stateid);
1698 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1699 out:
1700 nfs_state_log_update_open_stateid(state);
1701 }
1702
nfs_clear_open_stateid(struct nfs4_state * state,nfs4_stateid * arg_stateid,nfs4_stateid * stateid,fmode_t fmode)1703 static void nfs_clear_open_stateid(struct nfs4_state *state,
1704 nfs4_stateid *arg_stateid,
1705 nfs4_stateid *stateid, fmode_t fmode)
1706 {
1707 write_seqlock(&state->seqlock);
1708 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1709 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1710 nfs_clear_open_stateid_locked(state, stateid, fmode);
1711 write_sequnlock(&state->seqlock);
1712 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1713 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1714 }
1715
nfs_set_open_stateid_locked(struct nfs4_state * state,const nfs4_stateid * stateid,nfs4_stateid * freeme)1716 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1717 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1718 __must_hold(&state->owner->so_lock)
1719 __must_hold(&state->seqlock)
1720 __must_hold(RCU)
1721
1722 {
1723 DEFINE_WAIT(wait);
1724 int status = 0;
1725 for (;;) {
1726
1727 if (nfs_stateid_is_sequential(state, stateid))
1728 break;
1729
1730 if (status) {
1731 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1732 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1733 trace_nfs4_open_stateid_update_skip(state->inode,
1734 stateid, status);
1735 return;
1736 } else {
1737 break;
1738 }
1739 }
1740
1741 /* Rely on seqids for serialisation with NFSv4.0 */
1742 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1743 break;
1744
1745 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1746 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1747 /*
1748 * Ensure we process the state changes in the same order
1749 * in which the server processed them by delaying the
1750 * update of the stateid until we are in sequence.
1751 */
1752 write_sequnlock(&state->seqlock);
1753 spin_unlock(&state->owner->so_lock);
1754 rcu_read_unlock();
1755 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1756
1757 if (!fatal_signal_pending(current) &&
1758 !nfs_current_task_exiting()) {
1759 if (schedule_timeout(5*HZ) == 0)
1760 status = -EAGAIN;
1761 else
1762 status = 0;
1763 } else
1764 status = -EINTR;
1765 finish_wait(&state->waitq, &wait);
1766 rcu_read_lock();
1767 spin_lock(&state->owner->so_lock);
1768 write_seqlock(&state->seqlock);
1769 }
1770
1771 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1772 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1773 nfs4_stateid_copy(freeme, &state->open_stateid);
1774 nfs_test_and_clear_all_open_stateid(state);
1775 }
1776
1777 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1778 nfs4_stateid_copy(&state->stateid, stateid);
1779 nfs4_stateid_copy(&state->open_stateid, stateid);
1780 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1781 nfs_state_log_update_open_stateid(state);
1782 }
1783
nfs_state_set_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,fmode_t fmode,nfs4_stateid * freeme)1784 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1785 const nfs4_stateid *open_stateid,
1786 fmode_t fmode,
1787 nfs4_stateid *freeme)
1788 {
1789 /*
1790 * Protect the call to nfs4_state_set_mode_locked and
1791 * serialise the stateid update
1792 */
1793 write_seqlock(&state->seqlock);
1794 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1795 switch (fmode) {
1796 case FMODE_READ:
1797 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1798 break;
1799 case FMODE_WRITE:
1800 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1801 break;
1802 case FMODE_READ|FMODE_WRITE:
1803 set_bit(NFS_O_RDWR_STATE, &state->flags);
1804 }
1805 set_bit(NFS_OPEN_STATE, &state->flags);
1806 write_sequnlock(&state->seqlock);
1807 }
1808
nfs_state_clear_open_state_flags(struct nfs4_state * state)1809 void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1810 {
1811 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1812 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1813 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1814 clear_bit(NFS_OPEN_STATE, &state->flags);
1815 }
1816
nfs_state_set_delegation(struct nfs4_state * state,const nfs4_stateid * deleg_stateid,fmode_t fmode)1817 static void nfs_state_set_delegation(struct nfs4_state *state,
1818 const nfs4_stateid *deleg_stateid,
1819 fmode_t fmode)
1820 {
1821 /*
1822 * Protect the call to nfs4_state_set_mode_locked and
1823 * serialise the stateid update
1824 */
1825 write_seqlock(&state->seqlock);
1826 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1827 set_bit(NFS_DELEGATED_STATE, &state->flags);
1828 write_sequnlock(&state->seqlock);
1829 }
1830
nfs_state_clear_delegation(struct nfs4_state * state)1831 void nfs_state_clear_delegation(struct nfs4_state *state)
1832 {
1833 write_seqlock(&state->seqlock);
1834 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1835 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1836 write_sequnlock(&state->seqlock);
1837 }
1838
update_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,const nfs4_stateid * delegation,fmode_t fmode)1839 int update_open_stateid(struct nfs4_state *state,
1840 const nfs4_stateid *open_stateid,
1841 const nfs4_stateid *delegation,
1842 fmode_t fmode)
1843 {
1844 struct nfs_server *server = NFS_SERVER(state->inode);
1845 struct nfs_client *clp = server->nfs_client;
1846 struct nfs_delegation *deleg_cur;
1847 nfs4_stateid freeme = { };
1848 int ret = 0;
1849
1850 fmode &= (FMODE_READ|FMODE_WRITE);
1851
1852 spin_lock(&state->owner->so_lock);
1853 if (open_stateid != NULL) {
1854 rcu_read_lock();
1855 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1856 rcu_read_unlock();
1857 ret = 1;
1858 }
1859
1860 deleg_cur = nfs4_get_valid_delegation(state->inode);
1861 if (deleg_cur == NULL)
1862 goto no_delegation;
1863
1864 spin_lock(&deleg_cur->lock);
1865 if (!deleg_cur->inode ||
1866 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1867 (deleg_cur->type & fmode) != fmode)
1868 goto no_delegation_unlock;
1869
1870 if (delegation == NULL)
1871 delegation = &deleg_cur->stateid;
1872 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1873 goto no_delegation_unlock;
1874
1875 nfs_mark_delegation_referenced(deleg_cur);
1876 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1877 ret = 1;
1878 no_delegation_unlock:
1879 spin_unlock(&deleg_cur->lock);
1880 nfs_put_delegation(deleg_cur);
1881 no_delegation:
1882 if (ret)
1883 update_open_stateflags(state, fmode);
1884 spin_unlock(&state->owner->so_lock);
1885
1886 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1887 nfs4_schedule_state_manager(clp);
1888 if (freeme.type != 0)
1889 nfs4_test_and_free_stateid(server, &freeme,
1890 state->owner->so_cred);
1891
1892 return ret;
1893 }
1894
nfs4_update_lock_stateid(struct nfs4_lock_state * lsp,const nfs4_stateid * stateid)1895 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1896 const nfs4_stateid *stateid)
1897 {
1898 struct nfs4_state *state = lsp->ls_state;
1899 bool ret = false;
1900
1901 spin_lock(&state->state_lock);
1902 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1903 goto out_noupdate;
1904 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1905 goto out_noupdate;
1906 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1907 ret = true;
1908 out_noupdate:
1909 spin_unlock(&state->state_lock);
1910 return ret;
1911 }
1912
nfs4_return_incompatible_delegation(struct inode * inode,fmode_t fmode)1913 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1914 {
1915 struct nfs_delegation *delegation;
1916
1917 fmode &= FMODE_READ|FMODE_WRITE;
1918 delegation = nfs4_get_valid_delegation(inode);
1919 if (!delegation)
1920 return;
1921 if ((delegation->type & fmode) != fmode)
1922 nfs4_inode_return_delegation(inode);
1923 nfs_put_delegation(delegation);
1924 }
1925
nfs4_try_open_cached(struct nfs4_opendata * opendata)1926 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1927 {
1928 struct nfs4_state *state = opendata->state;
1929 int open_mode = opendata->o_arg.open_flags;
1930 fmode_t fmode = opendata->o_arg.fmode;
1931 enum open_claim_type4 claim = opendata->o_arg.claim;
1932 nfs4_stateid stateid;
1933 int ret = -EAGAIN;
1934
1935 for (;;) {
1936 spin_lock(&state->owner->so_lock);
1937 if (can_open_cached(state, fmode, open_mode, claim)) {
1938 update_open_stateflags(state, fmode);
1939 spin_unlock(&state->owner->so_lock);
1940 goto out_return_state;
1941 }
1942 spin_unlock(&state->owner->so_lock);
1943
1944 if (!can_open_delegated(state->inode, fmode, claim, &stateid))
1945 break;
1946
1947 nfs_release_seqid(opendata->o_arg.seqid);
1948 if (!opendata->is_recover) {
1949 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1950 if (ret != 0)
1951 goto out;
1952 }
1953 ret = -EAGAIN;
1954
1955 /* Try to update the stateid using the delegation */
1956 if (update_open_stateid(state, NULL, &stateid, fmode))
1957 goto out_return_state;
1958 }
1959 out:
1960 return ERR_PTR(ret);
1961 out_return_state:
1962 refcount_inc(&state->count);
1963 return state;
1964 }
1965
1966 static void
nfs4_process_delegation(struct inode * inode,const struct cred * cred,enum open_claim_type4 claim,const struct nfs4_open_delegation * delegation)1967 nfs4_process_delegation(struct inode *inode, const struct cred *cred,
1968 enum open_claim_type4 claim,
1969 const struct nfs4_open_delegation *delegation)
1970 {
1971 switch (delegation->open_delegation_type) {
1972 case NFS4_OPEN_DELEGATE_READ:
1973 case NFS4_OPEN_DELEGATE_WRITE:
1974 case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
1975 case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
1976 break;
1977 default:
1978 return;
1979 }
1980 switch (claim) {
1981 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1982 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1983 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1984 "returning a delegation for "
1985 "OPEN(CLAIM_DELEGATE_CUR)\n",
1986 NFS_SERVER(inode)->nfs_client->cl_hostname);
1987 break;
1988 case NFS4_OPEN_CLAIM_PREVIOUS:
1989 nfs_inode_reclaim_delegation(inode, cred, delegation->type,
1990 &delegation->stateid,
1991 delegation->pagemod_limit,
1992 delegation->open_delegation_type);
1993 break;
1994 default:
1995 nfs_inode_set_delegation(inode, cred, delegation->type,
1996 &delegation->stateid,
1997 delegation->pagemod_limit,
1998 delegation->open_delegation_type);
1999 }
2000 if (delegation->do_recall)
2001 nfs_async_inode_return_delegation(inode, &delegation->stateid);
2002 }
2003
2004 /*
2005 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
2006 * and update the nfs4_state.
2007 */
2008 static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata * data)2009 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
2010 {
2011 struct inode *inode = data->state->inode;
2012 struct nfs4_state *state = data->state;
2013 int ret;
2014
2015 if (!data->rpc_done) {
2016 if (data->rpc_status)
2017 return ERR_PTR(data->rpc_status);
2018 return nfs4_try_open_cached(data);
2019 }
2020
2021 ret = nfs_refresh_inode(inode, &data->f_attr);
2022 if (ret)
2023 return ERR_PTR(ret);
2024
2025 nfs4_process_delegation(state->inode,
2026 data->owner->so_cred,
2027 data->o_arg.claim,
2028 &data->o_res.delegation);
2029
2030 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2031 if (!update_open_stateid(state, &data->o_res.stateid,
2032 NULL, data->o_arg.fmode))
2033 return ERR_PTR(-EAGAIN);
2034 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode))
2035 return ERR_PTR(-EAGAIN);
2036 refcount_inc(&state->count);
2037
2038 return state;
2039 }
2040
2041 static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata * data)2042 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2043 {
2044 struct inode *inode;
2045
2046 switch (data->o_arg.claim) {
2047 case NFS4_OPEN_CLAIM_NULL:
2048 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2049 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2050 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2051 return ERR_PTR(-EAGAIN);
2052 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2053 &data->f_attr);
2054 break;
2055 default:
2056 inode = d_inode(data->dentry);
2057 ihold(inode);
2058 nfs_refresh_inode(inode, &data->f_attr);
2059 }
2060 return inode;
2061 }
2062
2063 static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata * data)2064 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2065 {
2066 struct nfs4_state *state;
2067 struct inode *inode;
2068
2069 inode = nfs4_opendata_get_inode(data);
2070 if (IS_ERR(inode))
2071 return ERR_CAST(inode);
2072 if (data->state != NULL && data->state->inode == inode) {
2073 state = data->state;
2074 refcount_inc(&state->count);
2075 } else
2076 state = nfs4_get_open_state(inode, data->owner);
2077 iput(inode);
2078 if (state == NULL)
2079 state = ERR_PTR(-ENOMEM);
2080 return state;
2081 }
2082
2083 static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2084 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2085 {
2086 struct nfs4_state *state;
2087
2088 if (!data->rpc_done) {
2089 state = nfs4_try_open_cached(data);
2090 trace_nfs4_cached_open(data->state);
2091 goto out;
2092 }
2093
2094 state = nfs4_opendata_find_nfs4_state(data);
2095 if (IS_ERR(state))
2096 goto out;
2097
2098 nfs4_process_delegation(state->inode,
2099 data->owner->so_cred,
2100 data->o_arg.claim,
2101 &data->o_res.delegation);
2102
2103 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2104 if (!update_open_stateid(state, &data->o_res.stateid,
2105 NULL, data->o_arg.fmode)) {
2106 nfs4_put_open_state(state);
2107 state = ERR_PTR(-EAGAIN);
2108 }
2109 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode)) {
2110 nfs4_put_open_state(state);
2111 state = ERR_PTR(-EAGAIN);
2112 }
2113 out:
2114 nfs_release_seqid(data->o_arg.seqid);
2115 return state;
2116 }
2117
2118 static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2119 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2120 {
2121 struct nfs4_state *ret;
2122
2123 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2124 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2125 else
2126 ret = _nfs4_opendata_to_nfs4_state(data);
2127 nfs4_sequence_free_slot(&data->o_res.seq_res);
2128 return ret;
2129 }
2130
2131 static struct nfs_open_context *
nfs4_state_find_open_context_mode(struct nfs4_state * state,fmode_t mode)2132 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2133 {
2134 struct nfs_inode *nfsi = NFS_I(state->inode);
2135 struct nfs_open_context *ctx;
2136
2137 rcu_read_lock();
2138 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2139 if (ctx->state != state)
2140 continue;
2141 if ((ctx->mode & mode) != mode)
2142 continue;
2143 if (!get_nfs_open_context(ctx))
2144 continue;
2145 rcu_read_unlock();
2146 return ctx;
2147 }
2148 rcu_read_unlock();
2149 return ERR_PTR(-ENOENT);
2150 }
2151
2152 static struct nfs_open_context *
nfs4_state_find_open_context(struct nfs4_state * state)2153 nfs4_state_find_open_context(struct nfs4_state *state)
2154 {
2155 struct nfs_open_context *ctx;
2156
2157 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2158 if (!IS_ERR(ctx))
2159 return ctx;
2160 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2161 if (!IS_ERR(ctx))
2162 return ctx;
2163 return nfs4_state_find_open_context_mode(state, FMODE_READ);
2164 }
2165
nfs4_open_recoverdata_alloc(struct nfs_open_context * ctx,struct nfs4_state * state,enum open_claim_type4 claim)2166 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2167 struct nfs4_state *state, enum open_claim_type4 claim)
2168 {
2169 struct nfs4_opendata *opendata;
2170
2171 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2172 NULL, claim, GFP_NOFS);
2173 if (opendata == NULL)
2174 return ERR_PTR(-ENOMEM);
2175 opendata->state = state;
2176 refcount_inc(&state->count);
2177 return opendata;
2178 }
2179
nfs4_open_recover_helper(struct nfs4_opendata * opendata,fmode_t fmode)2180 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2181 fmode_t fmode)
2182 {
2183 struct nfs4_state *newstate;
2184 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2185 int openflags = opendata->o_arg.open_flags;
2186 int ret;
2187
2188 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2189 return 0;
2190 opendata->o_arg.fmode = fmode;
2191 opendata->o_arg.share_access =
2192 nfs4_map_atomic_open_share(server, fmode, openflags);
2193 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2194 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2195 nfs4_init_opendata_res(opendata);
2196 ret = _nfs4_recover_proc_open(opendata);
2197 if (ret != 0)
2198 return ret;
2199 newstate = nfs4_opendata_to_nfs4_state(opendata);
2200 if (IS_ERR(newstate))
2201 return PTR_ERR(newstate);
2202 if (newstate != opendata->state)
2203 ret = -ESTALE;
2204 nfs4_close_state(newstate, fmode);
2205 return ret;
2206 }
2207
nfs4_open_recover(struct nfs4_opendata * opendata,struct nfs4_state * state)2208 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2209 {
2210 int ret;
2211
2212 /* memory barrier prior to reading state->n_* */
2213 smp_rmb();
2214 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2215 if (ret != 0)
2216 return ret;
2217 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2218 if (ret != 0)
2219 return ret;
2220 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2221 if (ret != 0)
2222 return ret;
2223 /*
2224 * We may have performed cached opens for all three recoveries.
2225 * Check if we need to update the current stateid.
2226 */
2227 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2228 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2229 write_seqlock(&state->seqlock);
2230 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2231 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2232 write_sequnlock(&state->seqlock);
2233 }
2234 return 0;
2235 }
2236
2237 /*
2238 * OPEN_RECLAIM:
2239 * reclaim state on the server after a reboot.
2240 */
_nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2241 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2242 {
2243 struct nfs_delegation *delegation;
2244 struct nfs4_opendata *opendata;
2245 u32 delegation_type = NFS4_OPEN_DELEGATE_NONE;
2246 int status;
2247
2248 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2249 NFS4_OPEN_CLAIM_PREVIOUS);
2250 if (IS_ERR(opendata))
2251 return PTR_ERR(opendata);
2252 rcu_read_lock();
2253 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2254 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) {
2255 switch(delegation->type) {
2256 case FMODE_READ:
2257 delegation_type = NFS4_OPEN_DELEGATE_READ;
2258 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2259 delegation_type = NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG;
2260 break;
2261 case FMODE_WRITE:
2262 case FMODE_READ|FMODE_WRITE:
2263 delegation_type = NFS4_OPEN_DELEGATE_WRITE;
2264 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2265 delegation_type = NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG;
2266 }
2267 }
2268 rcu_read_unlock();
2269 opendata->o_arg.u.delegation_type = delegation_type;
2270 status = nfs4_open_recover(opendata, state);
2271 nfs4_opendata_put(opendata);
2272 return status;
2273 }
2274
nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2275 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2276 {
2277 struct nfs_server *server = NFS_SERVER(state->inode);
2278 struct nfs4_exception exception = { };
2279 int err;
2280 do {
2281 err = _nfs4_do_open_reclaim(ctx, state);
2282 trace_nfs4_open_reclaim(ctx, 0, err);
2283 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2284 continue;
2285 if (err != -NFS4ERR_DELAY)
2286 break;
2287 nfs4_handle_exception(server, err, &exception);
2288 } while (exception.retry);
2289 return err;
2290 }
2291
nfs4_open_reclaim(struct nfs4_state_owner * sp,struct nfs4_state * state)2292 int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2293 {
2294 struct nfs_open_context *ctx;
2295 int ret;
2296
2297 ctx = nfs4_state_find_open_context(state);
2298 if (IS_ERR(ctx))
2299 return -EAGAIN;
2300 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2301 nfs_state_clear_open_state_flags(state);
2302 ret = nfs4_do_open_reclaim(ctx, state);
2303 put_nfs_open_context(ctx);
2304 return ret;
2305 }
2306
nfs4_handle_delegation_recall_error(struct nfs_server * server,struct nfs4_state * state,const nfs4_stateid * stateid,struct file_lock * fl,int err)2307 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)
2308 {
2309 switch (err) {
2310 default:
2311 printk(KERN_ERR "NFS: %s: unhandled error "
2312 "%d.\n", __func__, err);
2313 fallthrough;
2314 case 0:
2315 case -ENOENT:
2316 case -EAGAIN:
2317 case -ESTALE:
2318 case -ETIMEDOUT:
2319 break;
2320 case -NFS4ERR_BADSESSION:
2321 case -NFS4ERR_BADSLOT:
2322 case -NFS4ERR_BAD_HIGH_SLOT:
2323 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2324 case -NFS4ERR_DEADSESSION:
2325 return -EAGAIN;
2326 case -NFS4ERR_STALE_CLIENTID:
2327 case -NFS4ERR_STALE_STATEID:
2328 /* Don't recall a delegation if it was lost */
2329 nfs4_schedule_lease_recovery(server->nfs_client);
2330 return -EAGAIN;
2331 case -NFS4ERR_MOVED:
2332 nfs4_schedule_migration_recovery(server);
2333 return -EAGAIN;
2334 case -NFS4ERR_LEASE_MOVED:
2335 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2336 return -EAGAIN;
2337 case -NFS4ERR_DELEG_REVOKED:
2338 case -NFS4ERR_ADMIN_REVOKED:
2339 case -NFS4ERR_EXPIRED:
2340 case -NFS4ERR_BAD_STATEID:
2341 case -NFS4ERR_OPENMODE:
2342 nfs_inode_find_state_and_recover(state->inode,
2343 stateid);
2344 nfs4_schedule_stateid_recovery(server, state);
2345 return -EAGAIN;
2346 case -NFS4ERR_DELAY:
2347 case -NFS4ERR_GRACE:
2348 ssleep(1);
2349 return -EAGAIN;
2350 case -ENOMEM:
2351 case -NFS4ERR_DENIED:
2352 if (fl) {
2353 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2354 if (lsp)
2355 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2356 }
2357 return 0;
2358 }
2359 return err;
2360 }
2361
nfs4_open_delegation_recall(struct nfs_open_context * ctx,struct nfs4_state * state,const nfs4_stateid * stateid)2362 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2363 struct nfs4_state *state, const nfs4_stateid *stateid)
2364 {
2365 struct nfs_server *server = NFS_SERVER(state->inode);
2366 struct nfs4_opendata *opendata;
2367 int err = 0;
2368
2369 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2370 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2371 if (IS_ERR(opendata))
2372 return PTR_ERR(opendata);
2373 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2374 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2375 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2376 if (err)
2377 goto out;
2378 }
2379 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2380 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2381 if (err)
2382 goto out;
2383 }
2384 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2385 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2386 if (err)
2387 goto out;
2388 }
2389 nfs_state_clear_delegation(state);
2390 out:
2391 nfs4_opendata_put(opendata);
2392 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2393 }
2394
nfs4_open_confirm_prepare(struct rpc_task * task,void * calldata)2395 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2396 {
2397 struct nfs4_opendata *data = calldata;
2398
2399 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2400 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2401 }
2402
nfs4_open_confirm_done(struct rpc_task * task,void * calldata)2403 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2404 {
2405 struct nfs4_opendata *data = calldata;
2406
2407 data->c_res.seq_res.sr_slot_ops->done(task, &data->c_res.seq_res);
2408
2409 data->rpc_status = task->tk_status;
2410 if (data->rpc_status == 0) {
2411 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2412 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2413 renew_lease(data->o_res.server, data->timestamp);
2414 data->rpc_done = true;
2415 }
2416 }
2417
nfs4_open_confirm_release(void * calldata)2418 static void nfs4_open_confirm_release(void *calldata)
2419 {
2420 struct nfs4_opendata *data = calldata;
2421 struct nfs4_state *state = NULL;
2422
2423 /* If this request hasn't been cancelled, do nothing */
2424 if (!data->cancelled)
2425 goto out_free;
2426 /* In case of error, no cleanup! */
2427 if (!data->rpc_done)
2428 goto out_free;
2429 state = nfs4_opendata_to_nfs4_state(data);
2430 if (!IS_ERR(state))
2431 nfs4_close_state(state, data->o_arg.fmode);
2432 out_free:
2433 nfs4_opendata_put(data);
2434 }
2435
2436 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2437 .rpc_call_prepare = nfs4_open_confirm_prepare,
2438 .rpc_call_done = nfs4_open_confirm_done,
2439 .rpc_release = nfs4_open_confirm_release,
2440 };
2441
2442 /*
2443 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2444 */
_nfs4_proc_open_confirm(struct nfs4_opendata * data)2445 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2446 {
2447 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2448 struct rpc_task *task;
2449 struct rpc_message msg = {
2450 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2451 .rpc_argp = &data->c_arg,
2452 .rpc_resp = &data->c_res,
2453 .rpc_cred = data->owner->so_cred,
2454 };
2455 struct rpc_task_setup task_setup_data = {
2456 .rpc_client = server->client,
2457 .rpc_message = &msg,
2458 .callback_ops = &nfs4_open_confirm_ops,
2459 .callback_data = data,
2460 .workqueue = nfsiod_workqueue,
2461 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2462 };
2463 int status;
2464
2465 nfs4_init_sequence(server->nfs_client, &data->c_arg.seq_args,
2466 &data->c_res.seq_res, 1, data->is_recover);
2467 kref_get(&data->kref);
2468 data->rpc_done = false;
2469 data->rpc_status = 0;
2470 data->timestamp = jiffies;
2471 task = rpc_run_task(&task_setup_data);
2472 if (IS_ERR(task))
2473 return PTR_ERR(task);
2474 status = rpc_wait_for_completion_task(task);
2475 if (status != 0) {
2476 data->cancelled = true;
2477 smp_wmb();
2478 } else
2479 status = data->rpc_status;
2480 rpc_put_task(task);
2481 return status;
2482 }
2483
nfs4_open_prepare(struct rpc_task * task,void * calldata)2484 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2485 {
2486 struct nfs4_opendata *data = calldata;
2487 struct nfs4_state_owner *sp = data->owner;
2488 struct nfs_client *clp = sp->so_server->nfs_client;
2489 enum open_claim_type4 claim = data->o_arg.claim;
2490
2491 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2492 goto out_wait;
2493 /*
2494 * Check if we still need to send an OPEN call, or if we can use
2495 * a delegation instead.
2496 */
2497 if (data->state != NULL) {
2498 if (can_open_cached(data->state, data->o_arg.fmode,
2499 data->o_arg.open_flags, claim))
2500 goto out_no_action;
2501 if (can_open_delegated(data->state->inode, data->o_arg.fmode,
2502 claim, NULL)) {
2503 trace_nfs4_cached_open(data->state);
2504 goto out_no_action;
2505 }
2506 }
2507 /* Update client id. */
2508 data->o_arg.clientid = clp->cl_clientid;
2509 switch (claim) {
2510 default:
2511 break;
2512 case NFS4_OPEN_CLAIM_PREVIOUS:
2513 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2514 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2515 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2516 fallthrough;
2517 case NFS4_OPEN_CLAIM_FH:
2518 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2519 }
2520 data->timestamp = jiffies;
2521 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2522 &data->o_arg.seq_args,
2523 &data->o_res.seq_res,
2524 task) != 0)
2525 nfs_release_seqid(data->o_arg.seqid);
2526
2527 /* Set the create mode (note dependency on the session type) */
2528 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2529 if (data->o_arg.open_flags & O_EXCL) {
2530 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2531 if (clp->cl_mvops->minor_version == 0) {
2532 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2533 /* don't put an ACCESS op in OPEN compound if O_EXCL,
2534 * because ACCESS will return permission denied for
2535 * all bits until close */
2536 data->o_res.access_request = data->o_arg.access = 0;
2537 } else if (nfs4_has_persistent_session(clp))
2538 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2539 }
2540 return;
2541
2542 out_no_action:
2543 task->tk_action = NULL;
2544 out_wait:
2545 nfs4_sequence_done(task, &data->o_res.seq_res);
2546 }
2547
nfs4_open_done(struct rpc_task * task,void * calldata)2548 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2549 {
2550 struct nfs4_opendata *data = calldata;
2551
2552 data->rpc_status = task->tk_status;
2553
2554 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2555 return;
2556
2557 if (task->tk_status == 0) {
2558 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2559 switch (data->o_res.f_attr->mode & S_IFMT) {
2560 case S_IFREG:
2561 break;
2562 case S_IFLNK:
2563 data->rpc_status = -ELOOP;
2564 break;
2565 case S_IFDIR:
2566 data->rpc_status = -EISDIR;
2567 break;
2568 default:
2569 data->rpc_status = -ENOTDIR;
2570 }
2571 }
2572 renew_lease(data->o_res.server, data->timestamp);
2573 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2574 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2575 }
2576 data->rpc_done = true;
2577 }
2578
nfs4_open_release(void * calldata)2579 static void nfs4_open_release(void *calldata)
2580 {
2581 struct nfs4_opendata *data = calldata;
2582 struct nfs4_state *state = NULL;
2583
2584 /* In case of error, no cleanup! */
2585 if (data->rpc_status != 0 || !data->rpc_done) {
2586 nfs_release_seqid(data->o_arg.seqid);
2587 goto out_free;
2588 }
2589 /* If this request hasn't been cancelled, do nothing */
2590 if (!data->cancelled)
2591 goto out_free;
2592 /* In case we need an open_confirm, no cleanup! */
2593 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2594 goto out_free;
2595 state = nfs4_opendata_to_nfs4_state(data);
2596 if (!IS_ERR(state))
2597 nfs4_close_state(state, data->o_arg.fmode);
2598 out_free:
2599 nfs4_opendata_put(data);
2600 }
2601
2602 static const struct rpc_call_ops nfs4_open_ops = {
2603 .rpc_call_prepare = nfs4_open_prepare,
2604 .rpc_call_done = nfs4_open_done,
2605 .rpc_release = nfs4_open_release,
2606 };
2607
nfs4_run_open_task(struct nfs4_opendata * data,struct nfs_open_context * ctx)2608 static int nfs4_run_open_task(struct nfs4_opendata *data,
2609 struct nfs_open_context *ctx)
2610 {
2611 struct inode *dir = d_inode(data->dir);
2612 struct nfs_server *server = NFS_SERVER(dir);
2613 struct nfs_client *clp = server->nfs_client;
2614 struct nfs_openargs *o_arg = &data->o_arg;
2615 struct nfs_openres *o_res = &data->o_res;
2616 struct rpc_task *task;
2617 struct rpc_message msg = {
2618 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2619 .rpc_argp = o_arg,
2620 .rpc_resp = o_res,
2621 .rpc_cred = data->owner->so_cred,
2622 };
2623 struct rpc_task_setup task_setup_data = {
2624 .rpc_client = server->client,
2625 .rpc_message = &msg,
2626 .callback_ops = &nfs4_open_ops,
2627 .callback_data = data,
2628 .workqueue = nfsiod_workqueue,
2629 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2630 };
2631 int status;
2632
2633 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2634 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2635
2636 kref_get(&data->kref);
2637 data->rpc_done = false;
2638 data->rpc_status = 0;
2639 data->cancelled = false;
2640 data->is_recover = false;
2641 if (!ctx) {
2642 nfs4_init_sequence(clp, &o_arg->seq_args, &o_res->seq_res, 1, 1);
2643 data->is_recover = true;
2644 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2645 } else {
2646 nfs4_init_sequence(clp, &o_arg->seq_args, &o_res->seq_res, 1, 0);
2647 pnfs_lgopen_prepare(data, ctx);
2648 }
2649 task = rpc_run_task(&task_setup_data);
2650 if (IS_ERR(task))
2651 return PTR_ERR(task);
2652 status = rpc_wait_for_completion_task(task);
2653 if (status != 0) {
2654 data->cancelled = true;
2655 smp_wmb();
2656 } else
2657 status = data->rpc_status;
2658 rpc_put_task(task);
2659
2660 return status;
2661 }
2662
_nfs4_recover_proc_open(struct nfs4_opendata * data)2663 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2664 {
2665 struct inode *dir = d_inode(data->dir);
2666 struct nfs_openres *o_res = &data->o_res;
2667 int status;
2668
2669 status = nfs4_run_open_task(data, NULL);
2670 if (status != 0 || !data->rpc_done)
2671 return status;
2672
2673 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2674
2675 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2676 status = _nfs4_proc_open_confirm(data);
2677
2678 return status;
2679 }
2680
2681 /*
2682 * Additional permission checks in order to distinguish between an
2683 * open for read, and an open for execute. This works around the
2684 * fact that NFSv4 OPEN treats read and execute permissions as being
2685 * the same.
2686 * Note that in the non-execute case, we want to turn off permission
2687 * checking if we just created a new file (POSIX open() semantics).
2688 */
nfs4_opendata_access(const struct cred * cred,struct nfs4_opendata * opendata,struct nfs4_state * state,fmode_t fmode)2689 static int nfs4_opendata_access(const struct cred *cred,
2690 struct nfs4_opendata *opendata,
2691 struct nfs4_state *state, fmode_t fmode)
2692 {
2693 struct nfs_access_entry cache;
2694 u32 mask, flags;
2695
2696 /* access call failed or for some reason the server doesn't
2697 * support any access modes -- defer access call until later */
2698 if (opendata->o_res.access_supported == 0)
2699 return 0;
2700
2701 mask = 0;
2702 if (fmode & FMODE_EXEC) {
2703 /* ONLY check for exec rights */
2704 if (S_ISDIR(state->inode->i_mode))
2705 mask = NFS4_ACCESS_LOOKUP;
2706 else
2707 mask = NFS4_ACCESS_EXECUTE;
2708 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2709 mask = NFS4_ACCESS_READ;
2710
2711 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2712 nfs_access_add_cache(state->inode, &cache, cred);
2713
2714 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2715 if ((mask & ~cache.mask & flags) == 0)
2716 return 0;
2717
2718 return -EACCES;
2719 }
2720
2721 /*
2722 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2723 */
_nfs4_proc_open(struct nfs4_opendata * data,struct nfs_open_context * ctx)2724 static int _nfs4_proc_open(struct nfs4_opendata *data,
2725 struct nfs_open_context *ctx)
2726 {
2727 struct inode *dir = d_inode(data->dir);
2728 struct nfs_server *server = NFS_SERVER(dir);
2729 struct nfs_openargs *o_arg = &data->o_arg;
2730 struct nfs_openres *o_res = &data->o_res;
2731 int status;
2732
2733 status = nfs4_run_open_task(data, ctx);
2734 if (!data->rpc_done)
2735 return status;
2736 if (status != 0) {
2737 if (status == -NFS4ERR_BADNAME &&
2738 !(o_arg->open_flags & O_CREAT))
2739 return -ENOENT;
2740 return status;
2741 }
2742
2743 nfs_fattr_map_and_free_names(server, &data->f_attr);
2744
2745 if (o_arg->open_flags & O_CREAT) {
2746 if (o_arg->open_flags & O_EXCL)
2747 data->file_created = true;
2748 else if (o_res->cinfo.before != o_res->cinfo.after)
2749 data->file_created = true;
2750 if (data->file_created ||
2751 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2752 nfs4_update_changeattr(dir, &o_res->cinfo,
2753 o_res->f_attr->time_start,
2754 NFS_INO_INVALID_DATA);
2755 }
2756 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2757 server->caps &= ~NFS_CAP_POSIX_LOCK;
2758 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2759 status = _nfs4_proc_open_confirm(data);
2760 if (status != 0)
2761 return status;
2762 }
2763 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2764 struct nfs_fh *fh = &o_res->fh;
2765
2766 nfs4_sequence_free_slot(&o_res->seq_res);
2767 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2768 fh = NFS_FH(d_inode(data->dentry));
2769 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2770 }
2771 return 0;
2772 }
2773
2774 /*
2775 * OPEN_EXPIRED:
2776 * reclaim state on the server after a network partition.
2777 * Assumes caller holds the appropriate lock
2778 */
_nfs4_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2779 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2780 {
2781 struct nfs4_opendata *opendata;
2782 int ret;
2783
2784 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2785 if (IS_ERR(opendata))
2786 return PTR_ERR(opendata);
2787 /*
2788 * We're not recovering a delegation, so ask for no delegation.
2789 * Otherwise the recovery thread could deadlock with an outstanding
2790 * delegation return.
2791 */
2792 opendata->o_arg.open_flags = O_DIRECT;
2793 ret = nfs4_open_recover(opendata, state);
2794 if (ret == -ESTALE)
2795 d_drop(ctx->dentry);
2796 nfs4_opendata_put(opendata);
2797 return ret;
2798 }
2799
nfs4_do_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2800 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2801 {
2802 struct nfs_server *server = NFS_SERVER(state->inode);
2803 struct nfs4_exception exception = { };
2804 int err;
2805
2806 do {
2807 err = _nfs4_open_expired(ctx, state);
2808 trace_nfs4_open_expired(ctx, 0, err);
2809 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2810 continue;
2811 switch (err) {
2812 default:
2813 goto out;
2814 case -NFS4ERR_GRACE:
2815 case -NFS4ERR_DELAY:
2816 nfs4_handle_exception(server, err, &exception);
2817 err = 0;
2818 }
2819 } while (exception.retry);
2820 out:
2821 return err;
2822 }
2823
nfs4_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2824 int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2825 {
2826 struct nfs_open_context *ctx;
2827 int ret;
2828
2829 ctx = nfs4_state_find_open_context(state);
2830 if (IS_ERR(ctx))
2831 return -EAGAIN;
2832 ret = nfs4_do_open_expired(ctx, state);
2833 put_nfs_open_context(ctx);
2834 return ret;
2835 }
2836
nfs_finish_clear_delegation_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)2837 void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2838 const nfs4_stateid *stateid)
2839 {
2840 nfs_remove_bad_delegation(state->inode, stateid);
2841 nfs_state_clear_delegation(state);
2842 }
2843
nfs41_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2844 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2845 nfs4_stateid *stateid, const struct cred *cred)
2846 {
2847 int status;
2848
2849 switch (stateid->type) {
2850 default:
2851 break;
2852 case NFS4_INVALID_STATEID_TYPE:
2853 case NFS4_SPECIAL_STATEID_TYPE:
2854 case NFS4_FREED_STATEID_TYPE:
2855 return -NFS4ERR_BAD_STATEID;
2856 case NFS4_REVOKED_STATEID_TYPE:
2857 goto out_free;
2858 }
2859
2860 status = nfs41_test_stateid(server, stateid, cred);
2861 switch (status) {
2862 case -NFS4ERR_EXPIRED:
2863 case -NFS4ERR_ADMIN_REVOKED:
2864 case -NFS4ERR_DELEG_REVOKED:
2865 break;
2866 default:
2867 return status;
2868 }
2869 out_free:
2870 /* Ack the revoked state to the server */
2871 nfs41_free_stateid(server, stateid, cred, true);
2872 return -NFS4ERR_EXPIRED;
2873 }
2874
nfs41_check_delegation_stateid(struct nfs4_state * state)2875 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2876 {
2877 struct nfs_server *server = NFS_SERVER(state->inode);
2878 nfs4_stateid stateid;
2879 struct nfs_delegation *delegation;
2880 const struct cred *cred = NULL;
2881 int status, ret = NFS_OK;
2882
2883 /* Get the delegation credential for use by test/free_stateid */
2884 rcu_read_lock();
2885 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2886 if (delegation == NULL) {
2887 rcu_read_unlock();
2888 nfs_state_clear_delegation(state);
2889 return NFS_OK;
2890 }
2891
2892 spin_lock(&delegation->lock);
2893 nfs4_stateid_copy(&stateid, &delegation->stateid);
2894
2895 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2896 &delegation->flags)) {
2897 spin_unlock(&delegation->lock);
2898 rcu_read_unlock();
2899 return NFS_OK;
2900 }
2901
2902 if (delegation->cred)
2903 cred = get_cred(delegation->cred);
2904 spin_unlock(&delegation->lock);
2905 rcu_read_unlock();
2906 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2907 trace_nfs4_test_delegation_stateid(state, NULL, status);
2908 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2909 nfs_finish_clear_delegation_stateid(state, &stateid);
2910 else
2911 ret = status;
2912
2913 put_cred(cred);
2914 return ret;
2915 }
2916
nfs41_delegation_recover_stateid(struct nfs4_state * state)2917 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2918 {
2919 nfs4_stateid tmp;
2920
2921 if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2922 nfs4_copy_delegation_stateid(state->inode, state->state,
2923 &tmp, NULL) &&
2924 nfs4_stateid_match_other(&state->stateid, &tmp))
2925 nfs_state_set_delegation(state, &tmp, state->state);
2926 else
2927 nfs_state_clear_delegation(state);
2928 }
2929
2930 /**
2931 * nfs41_check_expired_locks - possibly free a lock stateid
2932 *
2933 * @state: NFSv4 state for an inode
2934 *
2935 * Returns NFS_OK if recovery for this stateid is now finished.
2936 * Otherwise a negative NFS4ERR value is returned.
2937 */
nfs41_check_expired_locks(struct nfs4_state * state)2938 static int nfs41_check_expired_locks(struct nfs4_state *state)
2939 {
2940 int status, ret = NFS_OK;
2941 struct nfs4_lock_state *lsp, *prev = NULL;
2942 struct nfs_server *server = NFS_SERVER(state->inode);
2943
2944 if (!test_bit(LK_STATE_IN_USE, &state->flags))
2945 goto out;
2946
2947 spin_lock(&state->state_lock);
2948 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2949 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2950 const struct cred *cred = lsp->ls_state->owner->so_cred;
2951
2952 refcount_inc(&lsp->ls_count);
2953 spin_unlock(&state->state_lock);
2954
2955 nfs4_put_lock_state(prev);
2956 prev = lsp;
2957
2958 status = nfs41_test_and_free_expired_stateid(server,
2959 &lsp->ls_stateid,
2960 cred);
2961 trace_nfs4_test_lock_stateid(state, lsp, status);
2962 if (status == -NFS4ERR_EXPIRED ||
2963 status == -NFS4ERR_BAD_STATEID) {
2964 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2965 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2966 if (!recover_lost_locks)
2967 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2968 } else if (status != NFS_OK) {
2969 ret = status;
2970 nfs4_put_lock_state(prev);
2971 goto out;
2972 }
2973 spin_lock(&state->state_lock);
2974 }
2975 }
2976 spin_unlock(&state->state_lock);
2977 nfs4_put_lock_state(prev);
2978 out:
2979 return ret;
2980 }
2981
2982 /**
2983 * nfs41_check_open_stateid - possibly free an open stateid
2984 *
2985 * @state: NFSv4 state for an inode
2986 *
2987 * Returns NFS_OK if recovery for this stateid is now finished.
2988 * Otherwise a negative NFS4ERR value is returned.
2989 */
nfs41_check_open_stateid(struct nfs4_state * state)2990 static int nfs41_check_open_stateid(struct nfs4_state *state)
2991 {
2992 struct nfs_server *server = NFS_SERVER(state->inode);
2993 nfs4_stateid *stateid = &state->open_stateid;
2994 const struct cred *cred = state->owner->so_cred;
2995 int status;
2996
2997 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2998 return -NFS4ERR_BAD_STATEID;
2999 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
3000 trace_nfs4_test_open_stateid(state, NULL, status);
3001 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
3002 nfs_state_clear_open_state_flags(state);
3003 stateid->type = NFS4_INVALID_STATEID_TYPE;
3004 return status;
3005 }
3006 if (nfs_open_stateid_recover_openmode(state))
3007 return -NFS4ERR_OPENMODE;
3008 return NFS_OK;
3009 }
3010
nfs41_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)3011 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
3012 {
3013 int status;
3014
3015 status = nfs41_check_delegation_stateid(state);
3016 if (status != NFS_OK)
3017 return status;
3018 nfs41_delegation_recover_stateid(state);
3019
3020 status = nfs41_check_expired_locks(state);
3021 if (status != NFS_OK)
3022 return status;
3023 status = nfs41_check_open_stateid(state);
3024 if (status != NFS_OK)
3025 status = nfs4_open_expired(sp, state);
3026 return status;
3027 }
3028
3029 /*
3030 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3031 * fields corresponding to attributes that were used to store the verifier.
3032 * Make sure we clobber those fields in the later setattr call
3033 */
nfs4_exclusive_attrset(struct nfs4_opendata * opendata,struct iattr * sattr,struct nfs4_label ** label)3034 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3035 struct iattr *sattr, struct nfs4_label **label)
3036 {
3037 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3038 __u32 attrset[3];
3039 unsigned ret;
3040 unsigned i;
3041
3042 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3043 attrset[i] = opendata->o_res.attrset[i];
3044 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3045 attrset[i] &= ~bitmask[i];
3046 }
3047
3048 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3049 sattr->ia_valid : 0;
3050
3051 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3052 if (sattr->ia_valid & ATTR_ATIME_SET)
3053 ret |= ATTR_ATIME_SET;
3054 else
3055 ret |= ATTR_ATIME;
3056 }
3057
3058 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3059 if (sattr->ia_valid & ATTR_MTIME_SET)
3060 ret |= ATTR_MTIME_SET;
3061 else
3062 ret |= ATTR_MTIME;
3063 }
3064
3065 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3066 *label = NULL;
3067 return ret;
3068 }
3069
_nfs4_open_and_get_state(struct nfs4_opendata * opendata,struct nfs_open_context * ctx)3070 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3071 struct nfs_open_context *ctx)
3072 {
3073 struct nfs4_state_owner *sp = opendata->owner;
3074 struct nfs_server *server = sp->so_server;
3075 struct dentry *dentry;
3076 struct nfs4_state *state;
3077 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3078 struct inode *dir = d_inode(opendata->dir);
3079 unsigned long dir_verifier;
3080 int ret;
3081
3082 dir_verifier = nfs_save_change_attribute(dir);
3083
3084 ret = _nfs4_proc_open(opendata, ctx);
3085 if (ret != 0)
3086 goto out;
3087
3088 state = _nfs4_opendata_to_nfs4_state(opendata);
3089 ret = PTR_ERR(state);
3090 if (IS_ERR(state))
3091 goto out;
3092 ctx->state = state;
3093 if (server->caps & NFS_CAP_POSIX_LOCK)
3094 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3095 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3096 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3097 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3098 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3099
3100 switch(opendata->o_arg.claim) {
3101 default:
3102 break;
3103 case NFS4_OPEN_CLAIM_NULL:
3104 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3105 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3106 if (!opendata->rpc_done)
3107 break;
3108 if (opendata->o_res.delegation.type != 0)
3109 dir_verifier = nfs_save_change_attribute(dir);
3110 }
3111
3112 dentry = opendata->dentry;
3113 nfs_set_verifier(dentry, dir_verifier);
3114 if (d_really_is_negative(dentry)) {
3115 struct dentry *alias;
3116 d_drop(dentry);
3117 alias = d_splice_alias(igrab(state->inode), dentry);
3118 /* d_splice_alias() can't fail here - it's a non-directory */
3119 if (alias) {
3120 dput(ctx->dentry);
3121 nfs_set_verifier(alias, dir_verifier);
3122 ctx->dentry = dentry = alias;
3123 }
3124 }
3125
3126 /* Parse layoutget results before we check for access */
3127 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3128
3129 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3130 if (ret != 0)
3131 goto out;
3132
3133 if (d_inode(dentry) == state->inode)
3134 nfs_inode_attach_open_context(ctx);
3135
3136 out:
3137 if (!opendata->cancelled) {
3138 if (opendata->lgp) {
3139 nfs4_lgopen_release(opendata->lgp);
3140 opendata->lgp = NULL;
3141 }
3142 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3143 }
3144 return ret;
3145 }
3146
3147 /*
3148 * Returns a referenced nfs4_state
3149 */
_nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,const struct nfs4_open_createattrs * c,int * opened)3150 static int _nfs4_do_open(struct inode *dir,
3151 struct nfs_open_context *ctx,
3152 int flags,
3153 const struct nfs4_open_createattrs *c,
3154 int *opened)
3155 {
3156 struct nfs4_state_owner *sp;
3157 struct nfs4_state *state = NULL;
3158 struct nfs_server *server = NFS_SERVER(dir);
3159 struct nfs4_opendata *opendata;
3160 struct dentry *dentry = ctx->dentry;
3161 const struct cred *cred = ctx->cred;
3162 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3163 fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3164 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3165 struct iattr *sattr = c->sattr;
3166 struct nfs4_label *label = c->label;
3167 int status;
3168
3169 /* Protect against reboot recovery conflicts */
3170 status = -ENOMEM;
3171 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3172 if (sp == NULL) {
3173 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3174 goto out_err;
3175 }
3176 status = nfs4_client_recover_expired_lease(server->nfs_client);
3177 if (status != 0)
3178 goto err_put_state_owner;
3179 if (d_really_is_positive(dentry))
3180 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3181 status = -ENOMEM;
3182 if (d_really_is_positive(dentry))
3183 claim = NFS4_OPEN_CLAIM_FH;
3184 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3185 c, claim, GFP_KERNEL);
3186 if (opendata == NULL)
3187 goto err_put_state_owner;
3188
3189 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3190 if (!opendata->f_attr.mdsthreshold) {
3191 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3192 if (!opendata->f_attr.mdsthreshold)
3193 goto err_opendata_put;
3194 }
3195 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3196 }
3197 if (d_really_is_positive(dentry))
3198 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3199
3200 status = _nfs4_open_and_get_state(opendata, ctx);
3201 if (status != 0)
3202 goto err_opendata_put;
3203 state = ctx->state;
3204
3205 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3206 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3207 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3208 /*
3209 * send create attributes which was not set by open
3210 * with an extra setattr.
3211 */
3212 if (attrs || label) {
3213 unsigned ia_old = sattr->ia_valid;
3214
3215 sattr->ia_valid = attrs;
3216 nfs_fattr_init(opendata->o_res.f_attr);
3217 status = nfs4_do_setattr(state->inode, cred,
3218 opendata->o_res.f_attr, sattr,
3219 ctx, label);
3220 if (status == 0) {
3221 nfs_setattr_update_inode(state->inode, sattr,
3222 opendata->o_res.f_attr);
3223 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3224 }
3225 sattr->ia_valid = ia_old;
3226 }
3227 }
3228 if (opened && opendata->file_created)
3229 *opened = 1;
3230
3231 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3232 *ctx_th = opendata->f_attr.mdsthreshold;
3233 opendata->f_attr.mdsthreshold = NULL;
3234 }
3235
3236 nfs4_opendata_put(opendata);
3237 nfs4_put_state_owner(sp);
3238 return 0;
3239 err_opendata_put:
3240 nfs4_opendata_put(opendata);
3241 err_put_state_owner:
3242 nfs4_put_state_owner(sp);
3243 out_err:
3244 return status;
3245 }
3246
3247
nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,struct iattr * sattr,struct nfs4_label * label,int * opened)3248 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3249 struct nfs_open_context *ctx,
3250 int flags,
3251 struct iattr *sattr,
3252 struct nfs4_label *label,
3253 int *opened)
3254 {
3255 struct nfs_server *server = NFS_SERVER(dir);
3256 struct nfs4_exception exception = {
3257 .interruptible = true,
3258 };
3259 struct nfs4_state *res;
3260 struct nfs4_open_createattrs c = {
3261 .label = label,
3262 .sattr = sattr,
3263 .verf = {
3264 [0] = (__u32)jiffies,
3265 [1] = (__u32)current->pid,
3266 },
3267 };
3268 int status;
3269
3270 do {
3271 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3272 res = ctx->state;
3273 trace_nfs4_open_file(ctx, flags, status);
3274 if (status == 0)
3275 break;
3276 /* NOTE: BAD_SEQID means the server and client disagree about the
3277 * book-keeping w.r.t. state-changing operations
3278 * (OPEN/CLOSE/LOCK/LOCKU...)
3279 * It is actually a sign of a bug on the client or on the server.
3280 *
3281 * If we receive a BAD_SEQID error in the particular case of
3282 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3283 * have unhashed the old state_owner for us, and that we can
3284 * therefore safely retry using a new one. We should still warn
3285 * the user though...
3286 */
3287 if (status == -NFS4ERR_BAD_SEQID) {
3288 pr_warn_ratelimited("NFS: v4 server %s "
3289 " returned a bad sequence-id error!\n",
3290 NFS_SERVER(dir)->nfs_client->cl_hostname);
3291 exception.retry = 1;
3292 continue;
3293 }
3294 /*
3295 * BAD_STATEID on OPEN means that the server cancelled our
3296 * state before it received the OPEN_CONFIRM.
3297 * Recover by retrying the request as per the discussion
3298 * on Page 181 of RFC3530.
3299 */
3300 if (status == -NFS4ERR_BAD_STATEID) {
3301 exception.retry = 1;
3302 continue;
3303 }
3304 if (status == -NFS4ERR_EXPIRED) {
3305 nfs4_schedule_lease_recovery(server->nfs_client);
3306 exception.retry = 1;
3307 continue;
3308 }
3309 if (status == -EAGAIN) {
3310 /* We must have found a delegation */
3311 exception.retry = 1;
3312 continue;
3313 }
3314 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3315 continue;
3316 res = ERR_PTR(nfs4_handle_exception(server,
3317 status, &exception));
3318 } while (exception.retry);
3319 return res;
3320 }
3321
_nfs4_do_setattr(struct inode * inode,struct nfs_setattrargs * arg,struct nfs_setattrres * res,const struct cred * cred,struct nfs_open_context * ctx)3322 static int _nfs4_do_setattr(struct inode *inode,
3323 struct nfs_setattrargs *arg,
3324 struct nfs_setattrres *res,
3325 const struct cred *cred,
3326 struct nfs_open_context *ctx)
3327 {
3328 struct nfs_server *server = NFS_SERVER(inode);
3329 struct rpc_message msg = {
3330 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3331 .rpc_argp = arg,
3332 .rpc_resp = res,
3333 .rpc_cred = cred,
3334 };
3335 const struct cred *delegation_cred = NULL;
3336 unsigned long timestamp = jiffies;
3337 bool truncate;
3338 int status;
3339
3340 nfs_fattr_init(res->fattr);
3341
3342 /* Servers should only apply open mode checks for file size changes */
3343 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3344 if (!truncate) {
3345 nfs4_inode_make_writeable(inode);
3346 goto zero_stateid;
3347 }
3348
3349 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3350 /* Use that stateid */
3351 } else if (ctx != NULL && ctx->state) {
3352 struct nfs_lock_context *l_ctx;
3353 if (!nfs4_valid_open_stateid(ctx->state))
3354 return -EBADF;
3355 l_ctx = nfs_get_lock_context(ctx);
3356 if (IS_ERR(l_ctx))
3357 return PTR_ERR(l_ctx);
3358 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3359 &arg->stateid, &delegation_cred);
3360 nfs_put_lock_context(l_ctx);
3361 if (status == -EIO)
3362 return -EBADF;
3363 else if (status == -EAGAIN)
3364 goto zero_stateid;
3365 } else {
3366 zero_stateid:
3367 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3368 }
3369 if (delegation_cred)
3370 msg.rpc_cred = delegation_cred;
3371
3372 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3373
3374 put_cred(delegation_cred);
3375 if (status == 0 && ctx != NULL)
3376 renew_lease(server, timestamp);
3377 trace_nfs4_setattr(inode, &arg->stateid, status);
3378 return status;
3379 }
3380
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)3381 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3382 struct nfs_fattr *fattr, struct iattr *sattr,
3383 struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3384 {
3385 struct nfs_server *server = NFS_SERVER(inode);
3386 __u32 bitmask[NFS4_BITMASK_SZ];
3387 struct nfs4_state *state = ctx ? ctx->state : NULL;
3388 struct nfs_setattrargs arg = {
3389 .fh = NFS_FH(inode),
3390 .iap = sattr,
3391 .server = server,
3392 .bitmask = bitmask,
3393 .label = ilabel,
3394 };
3395 struct nfs_setattrres res = {
3396 .fattr = fattr,
3397 .server = server,
3398 };
3399 struct nfs4_exception exception = {
3400 .state = state,
3401 .inode = inode,
3402 .stateid = &arg.stateid,
3403 };
3404 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE |
3405 NFS_INO_INVALID_CTIME;
3406 int err;
3407
3408 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3409 adjust_flags |= NFS_INO_INVALID_MODE;
3410 if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3411 adjust_flags |= NFS_INO_INVALID_OTHER;
3412 if (sattr->ia_valid & ATTR_ATIME)
3413 adjust_flags |= NFS_INO_INVALID_ATIME;
3414 if (sattr->ia_valid & ATTR_MTIME)
3415 adjust_flags |= NFS_INO_INVALID_MTIME;
3416
3417 do {
3418 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3419 inode, adjust_flags);
3420
3421 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3422 switch (err) {
3423 case -NFS4ERR_OPENMODE:
3424 if (!(sattr->ia_valid & ATTR_SIZE)) {
3425 pr_warn_once("NFSv4: server %s is incorrectly "
3426 "applying open mode checks to "
3427 "a SETATTR that is not "
3428 "changing file size.\n",
3429 server->nfs_client->cl_hostname);
3430 }
3431 if (state && !(state->state & FMODE_WRITE)) {
3432 err = -EBADF;
3433 if (sattr->ia_valid & ATTR_OPEN)
3434 err = -EACCES;
3435 goto out;
3436 }
3437 }
3438 err = nfs4_handle_exception(server, err, &exception);
3439 } while (exception.retry);
3440 out:
3441 return err;
3442 }
3443
3444 static bool
nfs4_wait_on_layoutreturn(struct inode * inode,struct rpc_task * task)3445 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3446 {
3447 if (inode == NULL || !nfs_have_layout(inode))
3448 return false;
3449
3450 return pnfs_wait_on_layoutreturn(inode, task);
3451 }
3452
3453 /*
3454 * Update the seqid of an open stateid
3455 */
nfs4_sync_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)3456 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3457 struct nfs4_state *state)
3458 {
3459 __be32 seqid_open;
3460 u32 dst_seqid;
3461 int seq;
3462
3463 for (;;) {
3464 if (!nfs4_valid_open_stateid(state))
3465 break;
3466 seq = read_seqbegin(&state->seqlock);
3467 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3468 nfs4_stateid_copy(dst, &state->open_stateid);
3469 if (read_seqretry(&state->seqlock, seq))
3470 continue;
3471 break;
3472 }
3473 seqid_open = state->open_stateid.seqid;
3474 if (read_seqretry(&state->seqlock, seq))
3475 continue;
3476
3477 dst_seqid = be32_to_cpu(dst->seqid);
3478 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3479 dst->seqid = seqid_open;
3480 break;
3481 }
3482 }
3483
3484 /*
3485 * Update the seqid of an open stateid after receiving
3486 * NFS4ERR_OLD_STATEID
3487 */
nfs4_refresh_open_old_stateid(nfs4_stateid * dst,struct nfs4_state * state)3488 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3489 struct nfs4_state *state)
3490 {
3491 __be32 seqid_open;
3492 u32 dst_seqid;
3493 bool ret;
3494 int seq, status = -EAGAIN;
3495 DEFINE_WAIT(wait);
3496
3497 for (;;) {
3498 ret = false;
3499 if (!nfs4_valid_open_stateid(state))
3500 break;
3501 seq = read_seqbegin(&state->seqlock);
3502 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3503 if (read_seqretry(&state->seqlock, seq))
3504 continue;
3505 break;
3506 }
3507
3508 write_seqlock(&state->seqlock);
3509 seqid_open = state->open_stateid.seqid;
3510
3511 dst_seqid = be32_to_cpu(dst->seqid);
3512
3513 /* Did another OPEN bump the state's seqid? try again: */
3514 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3515 dst->seqid = seqid_open;
3516 write_sequnlock(&state->seqlock);
3517 ret = true;
3518 break;
3519 }
3520
3521 /* server says we're behind but we haven't seen the update yet */
3522 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3523 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3524 write_sequnlock(&state->seqlock);
3525 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3526
3527 if (fatal_signal_pending(current) || nfs_current_task_exiting())
3528 status = -EINTR;
3529 else
3530 if (schedule_timeout(5*HZ) != 0)
3531 status = 0;
3532
3533 finish_wait(&state->waitq, &wait);
3534
3535 if (!status)
3536 continue;
3537 if (status == -EINTR)
3538 break;
3539
3540 /* we slept the whole 5 seconds, we must have lost a seqid */
3541 dst->seqid = cpu_to_be32(dst_seqid + 1);
3542 ret = true;
3543 break;
3544 }
3545
3546 return ret;
3547 }
3548
3549 struct nfs4_closedata {
3550 struct inode *inode;
3551 struct nfs4_state *state;
3552 struct nfs_closeargs arg;
3553 struct nfs_closeres res;
3554 struct {
3555 struct nfs4_layoutreturn_args arg;
3556 struct nfs4_layoutreturn_res res;
3557 struct nfs4_xdr_opaque_data ld_private;
3558 u32 roc_barrier;
3559 bool roc;
3560 } lr;
3561 struct nfs_fattr fattr;
3562 unsigned long timestamp;
3563 unsigned short retrans;
3564 };
3565
nfs4_free_closedata(void * data)3566 static void nfs4_free_closedata(void *data)
3567 {
3568 struct nfs4_closedata *calldata = data;
3569 struct nfs4_state_owner *sp = calldata->state->owner;
3570 struct super_block *sb = calldata->state->inode->i_sb;
3571
3572 if (calldata->lr.roc)
3573 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3574 calldata->res.lr_ret);
3575 nfs4_put_open_state(calldata->state);
3576 nfs_free_seqid(calldata->arg.seqid);
3577 nfs4_put_state_owner(sp);
3578 nfs_sb_deactive(sb);
3579 kfree(calldata);
3580 }
3581
nfs4_close_done(struct rpc_task * task,void * data)3582 static void nfs4_close_done(struct rpc_task *task, void *data)
3583 {
3584 struct nfs4_closedata *calldata = data;
3585 struct nfs4_state *state = calldata->state;
3586 struct nfs_server *server = NFS_SERVER(calldata->inode);
3587 nfs4_stateid *res_stateid = NULL;
3588 struct nfs4_exception exception = {
3589 .state = state,
3590 .inode = calldata->inode,
3591 .stateid = &calldata->arg.stateid,
3592 .retrans = calldata->retrans,
3593 };
3594
3595 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3596 return;
3597 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3598
3599 /* Handle Layoutreturn errors */
3600 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3601 &calldata->res.lr_ret) == -EAGAIN)
3602 goto out_restart;
3603
3604 /* hmm. we are done with the inode, and in the process of freeing
3605 * the state_owner. we keep this around to process errors
3606 */
3607 switch (task->tk_status) {
3608 case 0:
3609 res_stateid = &calldata->res.stateid;
3610 renew_lease(server, calldata->timestamp);
3611 break;
3612 case -NFS4ERR_ACCESS:
3613 if (calldata->arg.bitmask != NULL) {
3614 calldata->arg.bitmask = NULL;
3615 calldata->res.fattr = NULL;
3616 goto out_restart;
3617
3618 }
3619 break;
3620 case -NFS4ERR_OLD_STATEID:
3621 /* Did we race with OPEN? */
3622 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3623 state))
3624 goto out_restart;
3625 goto out_release;
3626 case -NFS4ERR_ADMIN_REVOKED:
3627 case -NFS4ERR_STALE_STATEID:
3628 case -NFS4ERR_EXPIRED:
3629 nfs4_free_revoked_stateid(server,
3630 &calldata->arg.stateid,
3631 task->tk_msg.rpc_cred);
3632 fallthrough;
3633 case -NFS4ERR_BAD_STATEID:
3634 if (calldata->arg.fmode == 0)
3635 break;
3636 fallthrough;
3637 default:
3638 task->tk_status = nfs4_async_handle_exception(task,
3639 server, task->tk_status, &exception);
3640 calldata->retrans = exception.retrans;
3641 if (exception.retry)
3642 goto out_restart;
3643 }
3644 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3645 res_stateid, calldata->arg.fmode);
3646 out_release:
3647 task->tk_status = 0;
3648 nfs_release_seqid(calldata->arg.seqid);
3649 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3650 dprintk("%s: ret = %d\n", __func__, task->tk_status);
3651 return;
3652 out_restart:
3653 task->tk_status = 0;
3654 rpc_restart_call_prepare(task);
3655 goto out_release;
3656 }
3657
nfs4_close_prepare(struct rpc_task * task,void * data)3658 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3659 {
3660 struct nfs4_closedata *calldata = data;
3661 struct nfs4_state *state = calldata->state;
3662 struct inode *inode = calldata->inode;
3663 struct nfs_server *server = NFS_SERVER(inode);
3664 struct pnfs_layout_hdr *lo;
3665 bool is_rdonly, is_wronly, is_rdwr;
3666 int call_close = 0;
3667
3668 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3669 goto out_wait;
3670
3671 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3672 spin_lock(&state->owner->so_lock);
3673 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3674 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3675 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3676 /* Calculate the change in open mode */
3677 calldata->arg.fmode = 0;
3678 if (state->n_rdwr == 0) {
3679 if (state->n_rdonly == 0)
3680 call_close |= is_rdonly;
3681 else if (is_rdonly)
3682 calldata->arg.fmode |= FMODE_READ;
3683 if (state->n_wronly == 0)
3684 call_close |= is_wronly;
3685 else if (is_wronly)
3686 calldata->arg.fmode |= FMODE_WRITE;
3687 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3688 call_close |= is_rdwr;
3689 } else if (is_rdwr)
3690 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3691
3692 nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3693 if (!nfs4_valid_open_stateid(state))
3694 call_close = 0;
3695 spin_unlock(&state->owner->so_lock);
3696
3697 if (!call_close) {
3698 /* Note: exit _without_ calling nfs4_close_done */
3699 goto out_no_action;
3700 }
3701
3702 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3703 nfs_release_seqid(calldata->arg.seqid);
3704 goto out_wait;
3705 }
3706
3707 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3708 if (lo && !pnfs_layout_is_valid(lo)) {
3709 calldata->arg.lr_args = NULL;
3710 calldata->res.lr_res = NULL;
3711 }
3712
3713 if (calldata->arg.fmode == 0)
3714 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3715
3716 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3717 /* Close-to-open cache consistency revalidation */
3718 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
3719 nfs4_bitmask_set(calldata->arg.bitmask_store,
3720 server->cache_consistency_bitmask,
3721 inode, 0);
3722 calldata->arg.bitmask = calldata->arg.bitmask_store;
3723 } else
3724 calldata->arg.bitmask = NULL;
3725 }
3726
3727 calldata->arg.share_access =
3728 nfs4_fmode_to_share_access(calldata->arg.fmode);
3729
3730 if (calldata->res.fattr == NULL)
3731 calldata->arg.bitmask = NULL;
3732 else if (calldata->arg.bitmask == NULL)
3733 calldata->res.fattr = NULL;
3734 calldata->timestamp = jiffies;
3735 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3736 &calldata->arg.seq_args,
3737 &calldata->res.seq_res,
3738 task) != 0)
3739 nfs_release_seqid(calldata->arg.seqid);
3740 return;
3741 out_no_action:
3742 task->tk_action = NULL;
3743 out_wait:
3744 nfs4_sequence_done(task, &calldata->res.seq_res);
3745 }
3746
3747 static const struct rpc_call_ops nfs4_close_ops = {
3748 .rpc_call_prepare = nfs4_close_prepare,
3749 .rpc_call_done = nfs4_close_done,
3750 .rpc_release = nfs4_free_closedata,
3751 };
3752
3753 /*
3754 * It is possible for data to be read/written from a mem-mapped file
3755 * after the sys_close call (which hits the vfs layer as a flush).
3756 * This means that we can't safely call nfsv4 close on a file until
3757 * the inode is cleared. This in turn means that we are not good
3758 * NFSv4 citizens - we do not indicate to the server to update the file's
3759 * share state even when we are done with one of the three share
3760 * stateid's in the inode.
3761 *
3762 * NOTE: Caller must be holding the sp->so_owner semaphore!
3763 */
nfs4_do_close(struct nfs4_state * state,gfp_t gfp_mask,int wait)3764 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3765 {
3766 struct nfs_server *server = NFS_SERVER(state->inode);
3767 struct nfs_client *clp = server->nfs_client;
3768 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3769 struct nfs4_closedata *calldata;
3770 struct nfs4_state_owner *sp = state->owner;
3771 struct rpc_task *task;
3772 struct rpc_message msg = {
3773 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3774 .rpc_cred = state->owner->so_cred,
3775 };
3776 struct rpc_task_setup task_setup_data = {
3777 .rpc_client = server->client,
3778 .rpc_message = &msg,
3779 .callback_ops = &nfs4_close_ops,
3780 .workqueue = nfsiod_workqueue,
3781 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3782 };
3783 int status = -ENOMEM;
3784
3785 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3786 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3787
3788 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_CLEANUP,
3789 &task_setup_data.rpc_client, &msg);
3790
3791 calldata = kzalloc_obj(*calldata, gfp_mask);
3792 if (calldata == NULL)
3793 goto out;
3794 nfs4_init_sequence(clp, &calldata->arg.seq_args,
3795 &calldata->res.seq_res, 1, 0);
3796 calldata->inode = state->inode;
3797 calldata->state = state;
3798 calldata->arg.fh = NFS_FH(state->inode);
3799 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3800 goto out_free_calldata;
3801 /* Serialization for the sequence id */
3802 alloc_seqid = clp->cl_mvops->alloc_seqid;
3803 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3804 if (IS_ERR(calldata->arg.seqid))
3805 goto out_free_calldata;
3806 nfs_fattr_init(&calldata->fattr);
3807 calldata->arg.fmode = 0;
3808 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3809 calldata->res.fattr = &calldata->fattr;
3810 calldata->res.seqid = calldata->arg.seqid;
3811 calldata->res.server = server;
3812 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3813 calldata->lr.roc = pnfs_roc(state->inode, &calldata->lr.arg,
3814 &calldata->lr.res, msg.rpc_cred, wait);
3815 if (calldata->lr.roc) {
3816 calldata->arg.lr_args = &calldata->lr.arg;
3817 calldata->res.lr_res = &calldata->lr.res;
3818 }
3819 nfs_sb_active(calldata->inode->i_sb);
3820
3821 msg.rpc_argp = &calldata->arg;
3822 msg.rpc_resp = &calldata->res;
3823 task_setup_data.callback_data = calldata;
3824 task = rpc_run_task(&task_setup_data);
3825 if (IS_ERR(task))
3826 return PTR_ERR(task);
3827 status = 0;
3828 if (wait)
3829 status = rpc_wait_for_completion_task(task);
3830 rpc_put_task(task);
3831 return status;
3832 out_free_calldata:
3833 kfree(calldata);
3834 out:
3835 nfs4_put_open_state(state);
3836 nfs4_put_state_owner(sp);
3837 return status;
3838 }
3839
3840 static struct inode *
nfs4_atomic_open(struct inode * dir,struct nfs_open_context * ctx,int open_flags,struct iattr * attr,int * opened)3841 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3842 int open_flags, struct iattr *attr, int *opened)
3843 {
3844 struct nfs4_state *state;
3845 struct nfs4_label l, *label;
3846
3847 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3848
3849 /* Protect against concurrent sillydeletes */
3850 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3851
3852 nfs4_label_release_security(label);
3853
3854 if (IS_ERR(state))
3855 return ERR_CAST(state);
3856
3857 /*
3858 * Use O_DIRECT if file was marked as Uncacheable, see:
3859 * https://datatracker.ietf.org/doc/draft-ietf-nfsv4-uncacheable-files/
3860 */
3861 if (!(open_flags & O_DIRECT) && NFS_I(state->inode)->uncacheable_file_data) {
3862 if (!(open_flags & O_APPEND))
3863 set_bit(NFS_CONTEXT_O_DIRECT, &ctx->flags);
3864 }
3865
3866 return state->inode;
3867 }
3868
nfs4_close_context(struct nfs_open_context * ctx,int is_sync)3869 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3870 {
3871 struct dentry *dentry = ctx->dentry;
3872 if (ctx->state == NULL)
3873 return;
3874 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
3875 nfs4_inode_set_return_delegation_on_close(d_inode(dentry));
3876 if (is_sync)
3877 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3878 else
3879 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3880 }
3881
3882 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3883 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3884 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_UNCACHEABLE_FILE_DATA - 1UL)
3885
3886 #define FATTR4_WORD2_NFS42_TIME_DELEG_MASK \
3887 (FATTR4_WORD2_TIME_DELEG_MODIFY|FATTR4_WORD2_TIME_DELEG_ACCESS)
nfs4_server_delegtime_capable(struct nfs4_server_caps_res * res)3888 static bool nfs4_server_delegtime_capable(struct nfs4_server_caps_res *res)
3889 {
3890 u32 share_access_want = res->open_caps.oa_share_access_want[0];
3891 u32 attr_bitmask = res->attr_bitmask[2];
3892
3893 return (share_access_want & NFS4_SHARE_WANT_DELEG_TIMESTAMPS) &&
3894 ((attr_bitmask & FATTR4_WORD2_NFS42_TIME_DELEG_MASK) ==
3895 FATTR4_WORD2_NFS42_TIME_DELEG_MASK);
3896 }
3897
_nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3898 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3899 {
3900 u32 minorversion = server->nfs_client->cl_minorversion;
3901 u32 bitmask[3] = {
3902 [0] = FATTR4_WORD0_SUPPORTED_ATTRS,
3903 };
3904 struct nfs4_server_caps_arg args = {
3905 .fhandle = fhandle,
3906 .bitmask = bitmask,
3907 };
3908 struct nfs4_server_caps_res res = {};
3909 struct rpc_message msg = {
3910 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3911 .rpc_argp = &args,
3912 .rpc_resp = &res,
3913 };
3914 int status;
3915 int i;
3916
3917 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3918 FATTR4_WORD0_FH_EXPIRE_TYPE |
3919 FATTR4_WORD0_LINK_SUPPORT |
3920 FATTR4_WORD0_SYMLINK_SUPPORT |
3921 FATTR4_WORD0_ACLSUPPORT |
3922 FATTR4_WORD0_CASE_INSENSITIVE |
3923 FATTR4_WORD0_CASE_PRESERVING;
3924 if (minorversion)
3925 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3926 if (minorversion > 1)
3927 bitmask[2] |= FATTR4_WORD2_OPEN_ARGUMENTS;
3928
3929 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3930 if (status == 0) {
3931 bitmask[0] = (FATTR4_WORD0_SUPPORTED_ATTRS |
3932 FATTR4_WORD0_FH_EXPIRE_TYPE |
3933 FATTR4_WORD0_LINK_SUPPORT |
3934 FATTR4_WORD0_SYMLINK_SUPPORT |
3935 FATTR4_WORD0_ACLSUPPORT |
3936 FATTR4_WORD0_CASE_INSENSITIVE |
3937 FATTR4_WORD0_CASE_PRESERVING) &
3938 res.attr_bitmask[0];
3939 /* Sanity check the server answers */
3940 switch (minorversion) {
3941 case 0:
3942 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3943 res.attr_bitmask[2] = 0;
3944 break;
3945 case 1:
3946 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3947 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT &
3948 res.attr_bitmask[2];
3949 break;
3950 case 2:
3951 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3952 bitmask[2] = (FATTR4_WORD2_SUPPATTR_EXCLCREAT |
3953 FATTR4_WORD2_OPEN_ARGUMENTS) &
3954 res.attr_bitmask[2];
3955 }
3956 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3957 server->caps &=
3958 ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS |
3959 NFS_CAP_SECURITY_LABEL | NFS_CAP_FS_LOCATIONS |
3960 NFS_CAP_OPEN_XOR | NFS_CAP_DELEGTIME |
3961 NFS_CAP_CASE_INSENSITIVE | NFS_CAP_CASE_NONPRESERVING);
3962 server->fattr_valid = NFS_ATTR_FATTR_V4;
3963 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3964 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3965 server->caps |= NFS_CAP_ACLS;
3966 if (res.has_links != 0)
3967 server->caps |= NFS_CAP_HARDLINKS;
3968 if (res.has_symlinks != 0)
3969 server->caps |= NFS_CAP_SYMLINKS;
3970 if (res.case_insensitive)
3971 server->caps |= NFS_CAP_CASE_INSENSITIVE;
3972 if ((res.attr_bitmask[0] & FATTR4_WORD0_CASE_PRESERVING) &&
3973 !res.case_preserving)
3974 server->caps |= NFS_CAP_CASE_NONPRESERVING;
3975 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3976 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3977 server->caps |= NFS_CAP_SECURITY_LABEL;
3978 #endif
3979 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3980 server->caps |= NFS_CAP_FS_LOCATIONS;
3981 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3982 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3983 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3984 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3985 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3986 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3987 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3988 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3989 NFS_ATTR_FATTR_OWNER_NAME);
3990 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3991 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3992 NFS_ATTR_FATTR_GROUP_NAME);
3993 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3994 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3995 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3996 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3997 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3998 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3999 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
4000 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
4001 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
4002 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
4003 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_CREATE))
4004 server->fattr_valid &= ~NFS_ATTR_FATTR_BTIME;
4005 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
4006 sizeof(server->attr_bitmask));
4007 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4008 if (!(res.attr_bitmask[2] & FATTR4_WORD2_UNCACHEABLE_FILE_DATA))
4009 server->fattr_valid &= ~NFS_ATTR_FATTR_UNCACHEABLE_FILE_DATA;
4010
4011 if (res.open_caps.oa_share_access_want[0] &
4012 NFS4_SHARE_WANT_OPEN_XOR_DELEGATION)
4013 server->caps |= NFS_CAP_OPEN_XOR;
4014 if (nfs4_server_delegtime_capable(&res))
4015 server->caps |= NFS_CAP_DELEGTIME;
4016
4017 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
4018 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
4019 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
4020 server->cache_consistency_bitmask[2] = 0;
4021
4022 /* Avoid a regression due to buggy server */
4023 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
4024 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
4025 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
4026 sizeof(server->exclcreat_bitmask));
4027
4028 server->acl_bitmask = res.acl_bitmask;
4029 server->fh_expire_type = res.fh_expire_type;
4030 }
4031
4032 return status;
4033 }
4034
nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)4035 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
4036 {
4037 struct nfs4_exception exception = {
4038 .interruptible = true,
4039 };
4040 int err;
4041
4042 do {
4043 err = nfs4_handle_exception(server,
4044 _nfs4_server_capabilities(server, fhandle),
4045 &exception);
4046 } while (exception.retry);
4047 return err;
4048 }
4049
test_fs_location_for_trunking(struct nfs4_fs_location * location,struct nfs_client * clp,struct nfs_server * server)4050 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
4051 struct nfs_client *clp,
4052 struct nfs_server *server)
4053 {
4054 int i;
4055
4056 for (i = 0; i < location->nservers; i++) {
4057 struct nfs4_string *srv_loc = &location->servers[i];
4058 struct sockaddr_storage addr;
4059 size_t addrlen;
4060 struct xprt_create xprt_args = {
4061 .ident = 0,
4062 .net = clp->cl_net,
4063 };
4064 struct nfs4_add_xprt_data xprtdata = {
4065 .clp = clp,
4066 };
4067 struct rpc_add_xprt_test rpcdata = {
4068 .add_xprt_test = clp->cl_mvops->session_trunk,
4069 .data = &xprtdata,
4070 };
4071 char *servername = NULL;
4072
4073 if (!srv_loc->len)
4074 continue;
4075
4076 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4077 &addr, sizeof(addr),
4078 clp->cl_net, server->port);
4079 if (!addrlen)
4080 return;
4081 xprt_args.dstaddr = (struct sockaddr *)&addr;
4082 xprt_args.addrlen = addrlen;
4083 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4084 if (!servername)
4085 return;
4086 memcpy(servername, srv_loc->data, srv_loc->len);
4087 servername[srv_loc->len] = '\0';
4088 xprt_args.servername = servername;
4089
4090 xprtdata.cred = nfs4_get_clid_cred(clp);
4091 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4092 rpc_clnt_setup_test_and_add_xprt,
4093 &rpcdata);
4094 if (xprtdata.cred)
4095 put_cred(xprtdata.cred);
4096 kfree(servername);
4097 }
4098 }
4099
_is_same_nfs4_pathname(struct nfs4_pathname * path1,struct nfs4_pathname * path2)4100 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1,
4101 struct nfs4_pathname *path2)
4102 {
4103 int i;
4104
4105 if (path1->ncomponents != path2->ncomponents)
4106 return false;
4107 for (i = 0; i < path1->ncomponents; i++) {
4108 if (path1->components[i].len != path2->components[i].len)
4109 return false;
4110 if (memcmp(path1->components[i].data, path2->components[i].data,
4111 path1->components[i].len))
4112 return false;
4113 }
4114 return true;
4115 }
4116
_nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4117 static int _nfs4_discover_trunking(struct nfs_server *server,
4118 struct nfs_fh *fhandle)
4119 {
4120 struct nfs4_fs_locations *locations = NULL;
4121 struct page *page;
4122 const struct cred *cred;
4123 struct nfs_client *clp = server->nfs_client;
4124 const struct nfs4_state_maintenance_ops *ops =
4125 clp->cl_mvops->state_renewal_ops;
4126 int status = -ENOMEM, i;
4127
4128 cred = ops->get_state_renewal_cred(clp);
4129 if (cred == NULL) {
4130 cred = nfs4_get_clid_cred(clp);
4131 if (cred == NULL)
4132 return -ENOKEY;
4133 }
4134
4135 page = alloc_page(GFP_KERNEL);
4136 if (!page)
4137 goto out_put_cred;
4138 locations = kmalloc_obj(struct nfs4_fs_locations);
4139 if (!locations)
4140 goto out_free;
4141 locations->fattr = nfs_alloc_fattr();
4142 if (!locations->fattr)
4143 goto out_free_2;
4144
4145 status = nfs4_proc_get_locations(server, fhandle, locations, page,
4146 cred);
4147 if (status)
4148 goto out_free_3;
4149
4150 for (i = 0; i < locations->nlocations; i++) {
4151 if (!_is_same_nfs4_pathname(&locations->fs_path,
4152 &locations->locations[i].rootpath))
4153 continue;
4154 test_fs_location_for_trunking(&locations->locations[i], clp,
4155 server);
4156 }
4157 out_free_3:
4158 kfree(locations->fattr);
4159 out_free_2:
4160 kfree(locations);
4161 out_free:
4162 __free_page(page);
4163 out_put_cred:
4164 put_cred(cred);
4165 return status;
4166 }
4167
nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4168 static int nfs4_discover_trunking(struct nfs_server *server,
4169 struct nfs_fh *fhandle)
4170 {
4171 struct nfs4_exception exception = {
4172 .interruptible = true,
4173 };
4174 struct nfs_client *clp = server->nfs_client;
4175 int err = 0;
4176
4177 if (!nfs4_has_session(clp))
4178 goto out;
4179 do {
4180 err = nfs4_handle_exception(server,
4181 _nfs4_discover_trunking(server, fhandle),
4182 &exception);
4183 } while (exception.retry);
4184 out:
4185 return err;
4186 }
4187
_nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4188 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4189 struct nfs_fattr *fattr)
4190 {
4191 u32 bitmask[3] = {
4192 [0] = FATTR4_WORD0_TYPE | FATTR4_WORD0_CHANGE |
4193 FATTR4_WORD0_SIZE | FATTR4_WORD0_FSID,
4194 };
4195 struct nfs4_lookup_root_arg args = {
4196 .bitmask = bitmask,
4197 };
4198 struct nfs4_lookup_res res = {
4199 .server = server,
4200 .fattr = fattr,
4201 .fh = fhandle,
4202 };
4203 struct rpc_message msg = {
4204 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4205 .rpc_argp = &args,
4206 .rpc_resp = &res,
4207 };
4208
4209 nfs_fattr_init(fattr);
4210 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4211 }
4212
nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4213 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4214 struct nfs_fattr *fattr)
4215 {
4216 struct nfs4_exception exception = {
4217 .interruptible = true,
4218 };
4219 int err;
4220 do {
4221 err = _nfs4_lookup_root(server, fhandle, fattr);
4222 trace_nfs4_lookup_root(server, fhandle, fattr, err);
4223 switch (err) {
4224 case 0:
4225 case -NFS4ERR_WRONGSEC:
4226 goto out;
4227 default:
4228 err = nfs4_handle_exception(server, err, &exception);
4229 }
4230 } while (exception.retry);
4231 out:
4232 return err;
4233 }
4234
nfs4_lookup_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,rpc_authflavor_t flavor)4235 static int nfs4_lookup_root_sec(struct nfs_server *server,
4236 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4237 rpc_authflavor_t flavor)
4238 {
4239 struct rpc_auth_create_args auth_args = {
4240 .pseudoflavor = flavor,
4241 };
4242 struct rpc_auth *auth;
4243
4244 auth = rpcauth_create(&auth_args, server->client);
4245 if (IS_ERR(auth))
4246 return -EACCES;
4247 return nfs4_lookup_root(server, fhandle, fattr);
4248 }
4249
4250 /*
4251 * Retry pseudoroot lookup with various security flavors. We do this when:
4252 *
4253 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4254 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4255 *
4256 * Returns zero on success, or a negative NFS4ERR value, or a
4257 * negative errno value.
4258 */
nfs4_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4259 int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4260 struct nfs_fattr *fattr)
4261 {
4262 /* Per 3530bis 15.33.5 */
4263 static const rpc_authflavor_t flav_array[] = {
4264 RPC_AUTH_GSS_KRB5P,
4265 RPC_AUTH_GSS_KRB5I,
4266 RPC_AUTH_GSS_KRB5,
4267 RPC_AUTH_UNIX, /* courtesy */
4268 RPC_AUTH_NULL,
4269 };
4270 int status = -EPERM;
4271 size_t i;
4272
4273 if (server->auth_info.flavor_len > 0) {
4274 /* try each flavor specified by user */
4275 for (i = 0; i < server->auth_info.flavor_len; i++) {
4276 status = nfs4_lookup_root_sec(
4277 server, fhandle, fattr,
4278 server->auth_info.flavors[i]);
4279 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4280 continue;
4281 break;
4282 }
4283 } else {
4284 /* no flavors specified by user, try default list */
4285 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4286 status = nfs4_lookup_root_sec(server, fhandle, fattr,
4287 flav_array[i]);
4288 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4289 continue;
4290 break;
4291 }
4292 }
4293
4294 /*
4295 * -EACCES could mean that the user doesn't have correct permissions
4296 * to access the mount. It could also mean that we tried to mount
4297 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
4298 * existing mount programs don't handle -EACCES very well so it should
4299 * be mapped to -EPERM instead.
4300 */
4301 if (status == -EACCES)
4302 status = -EPERM;
4303 return status;
4304 }
4305
4306 /**
4307 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4308 * @server: initialized nfs_server handle
4309 * @fhandle: we fill in the pseudo-fs root file handle
4310 * @fattr: we fill in a bare bones struct fattr
4311 * @auth_probe: probe the auth flavours
4312 *
4313 * Returns zero on success, or a negative errno.
4314 */
nfs4_proc_get_rootfh(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,bool auth_probe)4315 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4316 struct nfs_fattr *fattr, bool auth_probe)
4317 {
4318 int status = 0;
4319
4320 if (!auth_probe)
4321 status = nfs4_lookup_root(server, fhandle, fattr);
4322
4323 if (auth_probe || status == NFS4ERR_WRONGSEC)
4324 status = server->nfs_client->cl_mvops->find_root_sec(
4325 server, fhandle, fattr);
4326
4327 return nfs4_map_errors(status);
4328 }
4329
nfs4_proc_get_root(struct nfs_server * server,struct nfs_fh * mntfh,struct nfs_fsinfo * info)4330 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4331 struct nfs_fsinfo *info)
4332 {
4333 int error;
4334 struct nfs_fattr *fattr = info->fattr;
4335
4336 error = nfs4_server_capabilities(server, mntfh);
4337 if (error < 0) {
4338 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4339 return error;
4340 }
4341
4342 error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4343 if (error < 0) {
4344 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4345 goto out;
4346 }
4347
4348 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4349 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4350 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4351
4352 out:
4353 return error;
4354 }
4355
4356 /*
4357 * Get locations and (maybe) other attributes of a referral.
4358 * Note that we'll actually follow the referral later when
4359 * we detect fsid mismatch in inode revalidation
4360 */
nfs4_get_referral(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs_fattr * fattr,struct nfs_fh * fhandle)4361 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4362 const struct qstr *name, struct nfs_fattr *fattr,
4363 struct nfs_fh *fhandle)
4364 {
4365 int status = -ENOMEM;
4366 struct page *page = NULL;
4367 struct nfs4_fs_locations *locations = NULL;
4368
4369 page = alloc_page(GFP_KERNEL);
4370 if (page == NULL)
4371 goto out;
4372 locations = kmalloc_obj(struct nfs4_fs_locations);
4373 if (locations == NULL)
4374 goto out;
4375
4376 locations->fattr = fattr;
4377
4378 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4379 if (status != 0)
4380 goto out;
4381
4382 /*
4383 * If the fsid didn't change, this is a migration event, not a
4384 * referral. Cause us to drop into the exception handler, which
4385 * will kick off migration recovery.
4386 */
4387 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4388 dprintk("%s: server did not return a different fsid for"
4389 " a referral at %s\n", __func__, name->name);
4390 status = -NFS4ERR_MOVED;
4391 goto out;
4392 }
4393 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4394 nfs_fixup_referral_attributes(fattr);
4395 memset(fhandle, 0, sizeof(struct nfs_fh));
4396 out:
4397 if (page)
4398 __free_page(page);
4399 kfree(locations);
4400 return status;
4401 }
4402
should_request_dir_deleg(struct inode * inode)4403 static bool should_request_dir_deleg(struct inode *inode)
4404 {
4405 if (!directory_delegations)
4406 return false;
4407 if (!inode)
4408 return false;
4409 if (!S_ISDIR(inode->i_mode))
4410 return false;
4411 if (!nfs_server_capable(inode, NFS_CAP_DIR_DELEG))
4412 return false;
4413 if (!test_and_clear_bit(NFS_INO_REQ_DIR_DELEG, &(NFS_I(inode)->flags)))
4414 return false;
4415 if (nfs4_have_delegation(inode, FMODE_READ, 0))
4416 return false;
4417 return true;
4418 }
4419
nfs4_call_getattr_prepare(struct rpc_task * task,void * calldata)4420 static void nfs4_call_getattr_prepare(struct rpc_task *task, void *calldata)
4421 {
4422 struct nfs4_call_sync_data *data = calldata;
4423 nfs4_setup_sequence(data->seq_server->nfs_client, data->seq_args,
4424 data->seq_res, task);
4425 }
4426
nfs4_call_getattr_done(struct rpc_task * task,void * calldata)4427 static void nfs4_call_getattr_done(struct rpc_task *task, void *calldata)
4428 {
4429 struct nfs4_call_sync_data *data = calldata;
4430
4431 nfs4_sequence_process(task, data->seq_res);
4432 }
4433
4434 static const struct rpc_call_ops nfs4_call_getattr_ops = {
4435 .rpc_call_prepare = nfs4_call_getattr_prepare,
4436 .rpc_call_done = nfs4_call_getattr_done,
4437 };
4438
_nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4439 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4440 struct nfs_fattr *fattr, struct inode *inode)
4441 {
4442 __u32 bitmask[NFS4_BITMASK_SZ];
4443 struct nfs4_getattr_arg args = {
4444 .fh = fhandle,
4445 .bitmask = bitmask,
4446 };
4447 struct nfs4_getattr_res res = {
4448 .fattr = fattr,
4449 .server = server,
4450 };
4451 struct rpc_message msg = {
4452 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4453 .rpc_argp = &args,
4454 .rpc_resp = &res,
4455 };
4456 struct nfs4_call_sync_data data = {
4457 .seq_server = server,
4458 .seq_args = &args.seq_args,
4459 .seq_res = &res.seq_res,
4460 };
4461 struct rpc_task_setup task_setup = {
4462 .rpc_client = server->client,
4463 .rpc_message = &msg,
4464 .callback_ops = &nfs4_call_getattr_ops,
4465 .callback_data = &data,
4466 };
4467 struct nfs_client *clp = server->nfs_client;
4468 struct nfs4_gdd_res gdd_res;
4469 int status;
4470
4471 if (nfs4_has_session(clp))
4472 task_setup.flags = RPC_TASK_MOVEABLE;
4473
4474 /* Is this is an attribute revalidation, subject to softreval? */
4475 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4476 task_setup.flags |= RPC_TASK_TIMEOUT;
4477
4478 args.get_dir_deleg = should_request_dir_deleg(inode);
4479 if (args.get_dir_deleg)
4480 res.gdd_res = &gdd_res;
4481
4482 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4483 nfs_fattr_init(fattr);
4484 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 0);
4485
4486 status = nfs4_call_sync_custom(&task_setup);
4487
4488 if (args.get_dir_deleg) {
4489 switch (status) {
4490 case 0:
4491 if (gdd_res.status != GDD4_OK)
4492 break;
4493 nfs_inode_set_delegation(inode, current_cred(),
4494 FMODE_READ, &gdd_res.deleg, 0,
4495 NFS4_OPEN_DELEGATE_READ);
4496 break;
4497 case -ENOTSUPP:
4498 case -EOPNOTSUPP:
4499 server->caps &= ~NFS_CAP_DIR_DELEG;
4500 break;
4501 case -NFS4ERR_INVAL:
4502 case -NFS4ERR_IO:
4503 case -NFS4ERR_DIRDELEG_UNAVAIL:
4504 case -NFS4ERR_NOTDIR:
4505 clear_bit(NFS_INO_REQ_DIR_DELEG, &(NFS_I(inode)->flags));
4506 status = -EAGAIN;
4507 }
4508 }
4509
4510 nfs4_sequence_free_slot(&res.seq_res);
4511 return status;
4512 }
4513
nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4514 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4515 struct nfs_fattr *fattr, struct inode *inode)
4516 {
4517 struct nfs4_exception exception = {
4518 .interruptible = true,
4519 };
4520 int err;
4521 do {
4522 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4523 trace_nfs4_getattr(server, fhandle, fattr, err);
4524 switch (err) {
4525 default:
4526 err = nfs4_handle_exception(server, err, &exception);
4527 break;
4528 case -EAGAIN:
4529 case -ENOTSUPP:
4530 case -EOPNOTSUPP:
4531 exception.retry = true;
4532 }
4533 } while (exception.retry);
4534 return err;
4535 }
4536
4537 /*
4538 * The file is not closed if it is opened due to the a request to change
4539 * the size of the file. The open call will not be needed once the
4540 * VFS layer lookup-intents are implemented.
4541 *
4542 * Close is called when the inode is destroyed.
4543 * If we haven't opened the file for O_WRONLY, we
4544 * need to in the size_change case to obtain a stateid.
4545 *
4546 * Got race?
4547 * Because OPEN is always done by name in nfsv4, it is
4548 * possible that we opened a different file by the same
4549 * name. We can recognize this race condition, but we
4550 * can't do anything about it besides returning an error.
4551 *
4552 * This will be fixed with VFS changes (lookup-intent).
4553 */
4554 static int
nfs4_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)4555 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4556 struct iattr *sattr)
4557 {
4558 struct inode *inode = d_inode(dentry);
4559 const struct cred *cred = NULL;
4560 struct nfs_open_context *ctx = NULL;
4561 int status;
4562
4563 if (pnfs_ld_layoutret_on_setattr(inode) &&
4564 sattr->ia_valid & ATTR_SIZE &&
4565 sattr->ia_size < i_size_read(inode))
4566 pnfs_commit_and_return_layout(inode);
4567
4568 nfs_fattr_init(fattr);
4569
4570 /* Deal with open(O_TRUNC) */
4571 if (sattr->ia_valid & ATTR_OPEN)
4572 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4573
4574 /* Optimization: if the end result is no change, don't RPC */
4575 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4576 return 0;
4577
4578 /* Search for an existing open(O_WRITE) file */
4579 if (sattr->ia_valid & ATTR_FILE) {
4580
4581 ctx = nfs_file_open_context(sattr->ia_file);
4582 if (ctx)
4583 cred = ctx->cred;
4584 }
4585
4586 /* Return any delegations if we're going to change ACLs */
4587 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4588 nfs4_inode_make_writeable(inode);
4589
4590 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4591 if (status == 0) {
4592 nfs_setattr_update_inode(inode, sattr, fattr);
4593 nfs_setsecurity(inode, fattr);
4594 }
4595 return status;
4596 }
4597
_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)4598 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4599 struct dentry *dentry, const struct qstr *name,
4600 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4601 {
4602 struct nfs_server *server = NFS_SERVER(dir);
4603 int status;
4604 struct nfs4_lookup_arg args = {
4605 .bitmask = server->attr_bitmask,
4606 .dir_fh = NFS_FH(dir),
4607 .name = name,
4608 };
4609 struct nfs4_lookup_res res = {
4610 .server = server,
4611 .fattr = fattr,
4612 .fh = fhandle,
4613 };
4614 struct rpc_message msg = {
4615 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4616 .rpc_argp = &args,
4617 .rpc_resp = &res,
4618 };
4619 unsigned short task_flags = 0;
4620 __u32 bitmask[NFS4_BITMASK_SZ];
4621
4622 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4623 task_flags = RPC_TASK_MOVEABLE;
4624
4625 /* Is this is an attribute revalidation, subject to softreval? */
4626 if (nfs_lookup_is_soft_revalidate(dentry))
4627 task_flags |= RPC_TASK_TIMEOUT;
4628
4629 /*
4630 * The looked-up object's type is unknown here, so gate out the
4631 * regular-file-only uncacheable_file_data attribute (NULL inode).
4632 */
4633 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
4634 NULL, 0);
4635 args.bitmask = bitmask;
4636
4637 nfs_fattr_init(fattr);
4638
4639 dprintk("NFS call lookup %pd2\n", dentry);
4640 nfs4_init_sequence(server->nfs_client, &args.seq_args, &res.seq_res, 0, 0);
4641 status = nfs4_do_call_sync(clnt, server, &msg,
4642 &args.seq_args, &res.seq_res, task_flags);
4643 dprintk("NFS reply lookup: %d\n", status);
4644 return status;
4645 }
4646
nfs_fixup_secinfo_attributes(struct nfs_fattr * fattr)4647 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4648 {
4649 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4650 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4651 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4652 fattr->nlink = 2;
4653 }
4654
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)4655 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4656 struct dentry *dentry, const struct qstr *name,
4657 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4658 {
4659 struct nfs4_exception exception = {
4660 .interruptible = true,
4661 };
4662 struct rpc_clnt *client = *clnt;
4663 int err;
4664 do {
4665 err = _nfs4_proc_lookup(client, dir, dentry, name, fhandle, fattr);
4666 trace_nfs4_lookup(dir, name, err);
4667 switch (err) {
4668 case -NFS4ERR_BADNAME:
4669 err = -ENOENT;
4670 goto out;
4671 case -NFS4ERR_MOVED:
4672 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4673 if (err == -NFS4ERR_MOVED)
4674 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4675 goto out;
4676 case -NFS4ERR_WRONGSEC:
4677 err = -EPERM;
4678 if (client != *clnt)
4679 goto out;
4680 client = nfs4_negotiate_security(client, dir, name);
4681 if (IS_ERR(client))
4682 return PTR_ERR(client);
4683
4684 exception.retry = 1;
4685 break;
4686 default:
4687 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4688 }
4689 } while (exception.retry);
4690
4691 out:
4692 if (err == 0)
4693 *clnt = client;
4694 else if (client != *clnt)
4695 rpc_shutdown_client(client);
4696
4697 return err;
4698 }
4699
nfs4_proc_lookup(struct inode * dir,struct dentry * dentry,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4700 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, const struct qstr *name,
4701 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4702 {
4703 int status;
4704 struct rpc_clnt *client = NFS_CLIENT(dir);
4705
4706 status = nfs4_proc_lookup_common(&client, dir, dentry, name, fhandle, fattr);
4707 if (client != NFS_CLIENT(dir)) {
4708 rpc_shutdown_client(client);
4709 nfs_fixup_secinfo_attributes(fattr);
4710 }
4711 return status;
4712 }
4713
4714 struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4715 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4716 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4717 {
4718 struct rpc_clnt *client = NFS_CLIENT(dir);
4719 int status;
4720
4721 status = nfs4_proc_lookup_common(&client, dir, dentry, &dentry->d_name,
4722 fhandle, fattr);
4723 if (status < 0)
4724 return ERR_PTR(status);
4725 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4726 }
4727
_nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4728 static int _nfs4_proc_lookupp(struct inode *inode,
4729 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4730 {
4731 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4732 struct nfs_server *server = NFS_SERVER(inode);
4733 int status;
4734 struct nfs4_lookupp_arg args = {
4735 .bitmask = server->attr_bitmask,
4736 .fh = NFS_FH(inode),
4737 };
4738 struct nfs4_lookupp_res res = {
4739 .server = server,
4740 .fattr = fattr,
4741 .fh = fhandle,
4742 };
4743 struct rpc_message msg = {
4744 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4745 .rpc_argp = &args,
4746 .rpc_resp = &res,
4747 };
4748 unsigned short task_flags = 0;
4749 __u32 bitmask[NFS4_BITMASK_SZ];
4750
4751 if (server->flags & NFS_MOUNT_SOFTREVAL)
4752 task_flags |= RPC_TASK_TIMEOUT;
4753 if (server->caps & NFS_CAP_MOVEABLE)
4754 task_flags |= RPC_TASK_MOVEABLE;
4755
4756 /*
4757 * The looked-up object's type is unknown here, so gate out the
4758 * regular-file-only uncacheable_file_data attribute (NULL inode).
4759 */
4760 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
4761 NULL, 0);
4762 args.bitmask = bitmask;
4763
4764 nfs_fattr_init(fattr);
4765 nfs4_init_sequence(server->nfs_client, &args.seq_args, &res.seq_res, 0, 0);
4766
4767 dprintk("NFS call lookupp ino=0x%llx\n", inode->i_ino);
4768 status = nfs4_do_call_sync(clnt, server, &msg, &args.seq_args,
4769 &res.seq_res, task_flags);
4770 dprintk("NFS reply lookupp: %d\n", status);
4771 return status;
4772 }
4773
nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4774 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4775 struct nfs_fattr *fattr)
4776 {
4777 struct nfs4_exception exception = {
4778 .interruptible = true,
4779 };
4780 int err;
4781 do {
4782 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4783 trace_nfs4_lookupp(inode, err);
4784 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4785 &exception);
4786 } while (exception.retry);
4787 return err;
4788 }
4789
_nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4790 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4791 const struct cred *cred)
4792 {
4793 struct nfs_server *server = NFS_SERVER(inode);
4794 struct nfs4_accessargs args = {
4795 .fh = NFS_FH(inode),
4796 .access = entry->mask,
4797 };
4798 struct nfs4_accessres res = {
4799 .server = server,
4800 };
4801 struct rpc_message msg = {
4802 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4803 .rpc_argp = &args,
4804 .rpc_resp = &res,
4805 .rpc_cred = cred,
4806 };
4807 int status = 0;
4808
4809 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
4810 nfs_request_directory_delegation(inode);
4811 res.fattr = nfs_alloc_fattr();
4812 if (res.fattr == NULL)
4813 return -ENOMEM;
4814 args.bitmask = server->cache_consistency_bitmask;
4815 }
4816 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4817 if (!status) {
4818 nfs_access_set_mask(entry, res.access);
4819 if (res.fattr)
4820 nfs_refresh_inode(inode, res.fattr);
4821 }
4822 nfs_free_fattr(res.fattr);
4823 return status;
4824 }
4825
nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4826 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4827 const struct cred *cred)
4828 {
4829 struct nfs4_exception exception = {
4830 .interruptible = true,
4831 };
4832 int err;
4833 do {
4834 err = _nfs4_proc_access(inode, entry, cred);
4835 trace_nfs4_access(inode, err);
4836 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4837 &exception);
4838 } while (exception.retry);
4839 return err;
4840 }
4841
4842 /*
4843 * TODO: For the time being, we don't try to get any attributes
4844 * along with any of the zero-copy operations READ, READDIR,
4845 * READLINK, WRITE.
4846 *
4847 * In the case of the first three, we want to put the GETATTR
4848 * after the read-type operation -- this is because it is hard
4849 * to predict the length of a GETATTR response in v4, and thus
4850 * align the READ data correctly. This means that the GETATTR
4851 * may end up partially falling into the page cache, and we should
4852 * shift it into the 'tail' of the xdr_buf before processing.
4853 * To do this efficiently, we need to know the total length
4854 * of data received, which doesn't seem to be available outside
4855 * of the RPC layer.
4856 *
4857 * In the case of WRITE, we also want to put the GETATTR after
4858 * the operation -- in this case because we want to make sure
4859 * we get the post-operation mtime and size.
4860 *
4861 * Both of these changes to the XDR layer would in fact be quite
4862 * minor, but I decided to leave them for a subsequent patch.
4863 */
_nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4864 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4865 unsigned int pgbase, unsigned int pglen)
4866 {
4867 struct nfs4_readlink args = {
4868 .fh = NFS_FH(inode),
4869 .pgbase = pgbase,
4870 .pglen = pglen,
4871 .pages = &page,
4872 };
4873 struct nfs4_readlink_res res;
4874 struct rpc_message msg = {
4875 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4876 .rpc_argp = &args,
4877 .rpc_resp = &res,
4878 };
4879
4880 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4881 }
4882
nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4883 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4884 unsigned int pgbase, unsigned int pglen)
4885 {
4886 struct nfs4_exception exception = {
4887 .interruptible = true,
4888 };
4889 int err;
4890 do {
4891 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4892 trace_nfs4_readlink(inode, err);
4893 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4894 &exception);
4895 } while (exception.retry);
4896 return err;
4897 }
4898
4899 /*
4900 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4901 */
4902 static int
nfs4_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)4903 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4904 int flags)
4905 {
4906 struct nfs_server *server = NFS_SERVER(dir);
4907 struct nfs4_label l, *ilabel;
4908 struct nfs_open_context *ctx;
4909 struct nfs4_state *state;
4910 int status = 0;
4911
4912 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4913 if (IS_ERR(ctx))
4914 return PTR_ERR(ctx);
4915
4916 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4917
4918 nfs_request_directory_delegation(dir);
4919
4920 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4921 sattr->ia_mode &= ~current_umask();
4922 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4923 if (IS_ERR(state)) {
4924 status = PTR_ERR(state);
4925 goto out;
4926 }
4927 out:
4928 nfs4_label_release_security(ilabel);
4929 put_nfs_open_context(ctx);
4930 return status;
4931 }
4932
4933 static int
_nfs4_proc_remove(struct inode * dir,const struct qstr * name,u32 ftype)4934 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4935 {
4936 struct nfs_server *server = NFS_SERVER(dir);
4937 struct nfs_removeargs args = {
4938 .fh = NFS_FH(dir),
4939 .name = *name,
4940 };
4941 struct nfs_removeres res = {
4942 .server = server,
4943 };
4944 struct rpc_message msg = {
4945 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4946 .rpc_argp = &args,
4947 .rpc_resp = &res,
4948 };
4949 unsigned long timestamp = jiffies;
4950 int status;
4951
4952 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4953 if (status == 0) {
4954 spin_lock(&dir->i_lock);
4955 /* Removing a directory decrements nlink in the parent */
4956 if (ftype == NF4DIR && dir->i_nlink > 2)
4957 nfs4_dec_nlink_locked(dir);
4958 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4959 NFS_INO_INVALID_DATA);
4960 spin_unlock(&dir->i_lock);
4961 }
4962 return status;
4963 }
4964
nfs4_proc_remove(struct inode * dir,struct dentry * dentry)4965 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4966 {
4967 struct nfs4_exception exception = {
4968 .interruptible = true,
4969 };
4970 struct inode *inode = d_inode(dentry);
4971 int err;
4972
4973 if (inode) {
4974 if (inode->i_nlink == 1)
4975 nfs4_inode_return_delegation(inode);
4976 else
4977 nfs4_inode_make_writeable(inode);
4978 }
4979 do {
4980 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4981 trace_nfs4_remove(dir, &dentry->d_name, err);
4982 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4983 &exception);
4984 } while (exception.retry);
4985 return err;
4986 }
4987
nfs4_proc_rmdir(struct inode * dir,const struct qstr * name)4988 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4989 {
4990 struct nfs4_exception exception = {
4991 .interruptible = true,
4992 };
4993 int err;
4994
4995 do {
4996 err = _nfs4_proc_remove(dir, name, NF4DIR);
4997 trace_nfs4_remove(dir, name, err);
4998 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4999 &exception);
5000 } while (exception.retry);
5001 return err;
5002 }
5003
nfs4_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)5004 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
5005 struct dentry *dentry,
5006 struct inode *inode)
5007 {
5008 struct nfs_removeargs *args = msg->rpc_argp;
5009 struct nfs_removeres *res = msg->rpc_resp;
5010 struct nfs_server *server = NFS_SB(dentry->d_sb);
5011
5012 res->server = server;
5013 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
5014 nfs4_init_sequence(server->nfs_client, &args->seq_args,
5015 &res->seq_res, 1, 0);
5016
5017 nfs_fattr_init(res->dir_attr);
5018 nfs_request_directory_delegation(d_inode(dentry->d_parent));
5019
5020 if (inode) {
5021 nfs4_inode_return_delegation(inode);
5022 nfs_d_prune_case_insensitive_aliases(inode);
5023 }
5024 }
5025
nfs4_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)5026 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
5027 {
5028 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
5029 &data->args.seq_args,
5030 &data->res.seq_res,
5031 task);
5032 }
5033
nfs4_proc_unlink_done(struct rpc_task * task,struct inode * dir)5034 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
5035 {
5036 struct nfs_unlinkdata *data = task->tk_calldata;
5037 struct nfs_removeres *res = &data->res;
5038
5039 if (!nfs4_sequence_done(task, &res->seq_res))
5040 return 0;
5041 if (nfs4_async_handle_error(task, res->server, NULL,
5042 &data->timeout) == -EAGAIN)
5043 return 0;
5044 if (task->tk_status == 0)
5045 nfs4_update_changeattr(dir, &res->cinfo,
5046 res->dir_attr->time_start,
5047 NFS_INO_INVALID_DATA);
5048 return 1;
5049 }
5050
nfs4_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry,struct inode * same_parent)5051 static void nfs4_proc_rename_setup(struct rpc_message *msg,
5052 struct dentry *old_dentry,
5053 struct dentry *new_dentry,
5054 struct inode *same_parent)
5055 {
5056 struct nfs_server *server = NFS_SB(old_dentry->d_sb);
5057 struct nfs_renameargs *arg = msg->rpc_argp;
5058 struct nfs_renameres *res = msg->rpc_resp;
5059 struct inode *old_inode = d_inode(old_dentry);
5060 struct inode *new_inode = d_inode(new_dentry);
5061
5062 if (old_inode)
5063 nfs4_inode_make_writeable(old_inode);
5064 if (new_inode)
5065 nfs4_inode_return_delegation(new_inode);
5066 if (same_parent)
5067 nfs_request_directory_delegation(same_parent);
5068 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
5069 res->server = server;
5070 nfs4_init_sequence(server->nfs_client, &arg->seq_args,
5071 &res->seq_res, 1, 0);
5072 }
5073
nfs4_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)5074 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
5075 {
5076 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
5077 &data->args.seq_args,
5078 &data->res.seq_res,
5079 task);
5080 }
5081
nfs4_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)5082 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
5083 struct inode *new_dir)
5084 {
5085 struct nfs_renamedata *data = task->tk_calldata;
5086 struct nfs_renameres *res = &data->res;
5087
5088 if (!nfs4_sequence_done(task, &res->seq_res))
5089 return 0;
5090 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
5091 return 0;
5092
5093 if (task->tk_status == 0) {
5094 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
5095 if (new_dir != old_dir) {
5096 /* Note: If we moved a directory, nlink will change */
5097 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5098 res->old_fattr->time_start,
5099 NFS_INO_INVALID_NLINK |
5100 NFS_INO_INVALID_DATA);
5101 nfs4_update_changeattr(new_dir, &res->new_cinfo,
5102 res->new_fattr->time_start,
5103 NFS_INO_INVALID_NLINK |
5104 NFS_INO_INVALID_DATA);
5105 nfs_update_delegated_mtime(new_dir);
5106 } else
5107 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5108 res->old_fattr->time_start,
5109 NFS_INO_INVALID_DATA);
5110 }
5111 return 1;
5112 }
5113
_nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5114 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5115 {
5116 struct nfs_server *server = NFS_SERVER(inode);
5117 __u32 bitmask[NFS4_BITMASK_SZ];
5118 struct nfs4_link_arg arg = {
5119 .fh = NFS_FH(inode),
5120 .dir_fh = NFS_FH(dir),
5121 .name = name,
5122 .bitmask = bitmask,
5123 };
5124 struct nfs4_link_res res = {
5125 .server = server,
5126 };
5127 struct rpc_message msg = {
5128 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
5129 .rpc_argp = &arg,
5130 .rpc_resp = &res,
5131 };
5132 int status = -ENOMEM;
5133
5134 res.fattr = nfs_alloc_fattr_with_label(server);
5135 if (res.fattr == NULL)
5136 goto out;
5137
5138 nfs4_inode_make_writeable(inode);
5139 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label),
5140 inode,
5141 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME);
5142 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5143 if (!status) {
5144 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
5145 NFS_INO_INVALID_DATA);
5146 nfs4_inc_nlink(inode);
5147 status = nfs_post_op_update_inode(inode, res.fattr);
5148 if (!status)
5149 nfs_setsecurity(inode, res.fattr);
5150 }
5151
5152 out:
5153 nfs_free_fattr(res.fattr);
5154 return status;
5155 }
5156
nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5157 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5158 {
5159 struct nfs4_exception exception = {
5160 .interruptible = true,
5161 };
5162 int err;
5163 do {
5164 err = nfs4_handle_exception(NFS_SERVER(inode),
5165 _nfs4_proc_link(inode, dir, name),
5166 &exception);
5167 } while (exception.retry);
5168 return err;
5169 }
5170
5171 struct nfs4_createdata {
5172 struct rpc_message msg;
5173 struct nfs4_create_arg arg;
5174 struct nfs4_create_res res;
5175 struct nfs_fh fh;
5176 struct nfs_fattr fattr;
5177 u32 bitmask[NFS4_BITMASK_SZ];
5178 };
5179
nfs4_alloc_createdata(struct inode * dir,const struct qstr * name,struct iattr * sattr,u32 ftype)5180 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
5181 const struct qstr *name, struct iattr *sattr, u32 ftype)
5182 {
5183 struct nfs4_createdata *data;
5184
5185 data = kzalloc_obj(*data);
5186 if (data != NULL) {
5187 struct nfs_server *server = NFS_SERVER(dir);
5188
5189 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
5190 if (IS_ERR(data->fattr.label))
5191 goto out_free;
5192
5193 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
5194 data->msg.rpc_argp = &data->arg;
5195 data->msg.rpc_resp = &data->res;
5196 data->arg.dir_fh = NFS_FH(dir);
5197 data->arg.server = server;
5198 data->arg.name = name;
5199 data->arg.attrs = sattr;
5200 data->arg.ftype = ftype;
5201 /*
5202 * CREATE only makes non-regular objects, so gate out the
5203 * regular-file-only uncacheable_file_data attribute (NULL inode).
5204 */
5205 nfs4_bitmap_copy_adjust(data->bitmask,
5206 nfs4_bitmask(server, data->fattr.label),
5207 NULL, 0);
5208 data->arg.bitmask = data->bitmask;
5209 data->arg.umask = current_umask();
5210 data->res.server = server;
5211 data->res.fh = &data->fh;
5212 data->res.fattr = &data->fattr;
5213 nfs_fattr_init(data->res.fattr);
5214 }
5215 return data;
5216 out_free:
5217 kfree(data);
5218 return NULL;
5219 }
5220
nfs4_do_create(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data)5221 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5222 {
5223 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5224 &data->arg.seq_args, &data->res.seq_res, 1);
5225 if (status == 0) {
5226 spin_lock(&dir->i_lock);
5227 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5228 data->res.fattr->time_start,
5229 NFS_INO_INVALID_DATA);
5230 spin_unlock(&dir->i_lock);
5231 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5232 }
5233 return status;
5234 }
5235
nfs4_do_mkdir(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data,int * statusp)5236 static struct dentry *nfs4_do_mkdir(struct inode *dir, struct dentry *dentry,
5237 struct nfs4_createdata *data, int *statusp)
5238 {
5239 struct dentry *ret;
5240
5241 *statusp = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5242 &data->arg.seq_args, &data->res.seq_res, 1);
5243
5244 if (*statusp)
5245 return NULL;
5246
5247 spin_lock(&dir->i_lock);
5248 /* Creating a directory bumps nlink in the parent */
5249 nfs4_inc_nlink_locked(dir);
5250 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5251 data->res.fattr->time_start,
5252 NFS_INO_INVALID_DATA);
5253 spin_unlock(&dir->i_lock);
5254 ret = nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
5255 if (!IS_ERR(ret))
5256 return ret;
5257 *statusp = PTR_ERR(ret);
5258 return NULL;
5259 }
5260
nfs4_free_createdata(struct nfs4_createdata * data)5261 static void nfs4_free_createdata(struct nfs4_createdata *data)
5262 {
5263 nfs4_label_free(data->fattr.label);
5264 kfree(data);
5265 }
5266
_nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr,struct nfs4_label * label)5267 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5268 struct folio *folio, unsigned int len, struct iattr *sattr,
5269 struct nfs4_label *label)
5270 {
5271 struct page *page = &folio->page;
5272 struct nfs4_createdata *data;
5273 int status = -ENAMETOOLONG;
5274
5275 if (len > NFS4_MAXPATHLEN)
5276 goto out;
5277
5278 status = -ENOMEM;
5279 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5280 if (data == NULL)
5281 goto out;
5282
5283 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5284 data->arg.u.symlink.pages = &page;
5285 data->arg.u.symlink.len = len;
5286 data->arg.label = label;
5287
5288 status = nfs4_do_create(dir, dentry, data);
5289
5290 nfs4_free_createdata(data);
5291 out:
5292 return status;
5293 }
5294
nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)5295 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5296 struct folio *folio, unsigned int len, struct iattr *sattr)
5297 {
5298 struct nfs4_exception exception = {
5299 .interruptible = true,
5300 };
5301 struct nfs4_label l, *label;
5302 int err;
5303
5304 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5305
5306 do {
5307 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
5308 trace_nfs4_symlink(dir, &dentry->d_name, err);
5309 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5310 &exception);
5311 } while (exception.retry);
5312
5313 nfs4_label_release_security(label);
5314 return err;
5315 }
5316
_nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,int * statusp)5317 static struct dentry *_nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5318 struct iattr *sattr,
5319 struct nfs4_label *label, int *statusp)
5320 {
5321 struct nfs4_createdata *data;
5322 struct dentry *ret = NULL;
5323
5324 *statusp = -ENOMEM;
5325 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5326 if (data == NULL)
5327 goto out;
5328
5329 data->arg.label = label;
5330 ret = nfs4_do_mkdir(dir, dentry, data, statusp);
5331
5332 nfs4_free_createdata(data);
5333 out:
5334 return ret;
5335 }
5336
nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)5337 static struct dentry *nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5338 struct iattr *sattr)
5339 {
5340 struct nfs_server *server = NFS_SERVER(dir);
5341 struct nfs4_exception exception = {
5342 .interruptible = true,
5343 };
5344 struct nfs4_label l, *label;
5345 struct dentry *alias;
5346 int err;
5347
5348 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5349
5350 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5351 sattr->ia_mode &= ~current_umask();
5352 do {
5353 alias = _nfs4_proc_mkdir(dir, dentry, sattr, label, &err);
5354 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5355 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
5356 if (err)
5357 alias = ERR_PTR(err);
5358 } while (exception.retry);
5359 nfs4_label_release_security(label);
5360
5361 return alias;
5362 }
5363
_nfs4_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)5364 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5365 struct nfs_readdir_res *nr_res)
5366 {
5367 struct inode *dir = d_inode(nr_arg->dentry);
5368 struct nfs_server *server = NFS_SERVER(dir);
5369 struct nfs4_readdir_arg args = {
5370 .fh = NFS_FH(dir),
5371 .pages = nr_arg->pages,
5372 .pgbase = 0,
5373 .count = nr_arg->page_len,
5374 .plus = nr_arg->plus,
5375 };
5376 struct nfs4_readdir_res res;
5377 struct rpc_message msg = {
5378 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5379 .rpc_argp = &args,
5380 .rpc_resp = &res,
5381 .rpc_cred = nr_arg->cred,
5382 };
5383 int status;
5384
5385 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5386 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5387 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5388 args.bitmask = server->attr_bitmask_nl;
5389 else
5390 args.bitmask = server->attr_bitmask;
5391
5392 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5393 res.pgbase = args.pgbase;
5394 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5395 &res.seq_res, 0);
5396 if (status >= 0) {
5397 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5398 status += args.pgbase;
5399 }
5400
5401 nfs_invalidate_atime(dir);
5402
5403 dprintk("%s: returns %d\n", __func__, status);
5404 return status;
5405 }
5406
nfs4_proc_readdir(struct nfs_readdir_arg * arg,struct nfs_readdir_res * res)5407 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5408 struct nfs_readdir_res *res)
5409 {
5410 struct nfs4_exception exception = {
5411 .interruptible = true,
5412 };
5413 int err;
5414 do {
5415 err = _nfs4_proc_readdir(arg, res);
5416 trace_nfs4_readdir(d_inode(arg->dentry), err);
5417 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5418 err, &exception);
5419 } while (exception.retry);
5420 return err;
5421 }
5422
_nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,dev_t rdev)5423 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5424 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5425 {
5426 struct nfs4_createdata *data;
5427 int mode = sattr->ia_mode;
5428 int status = -ENOMEM;
5429
5430 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5431 if (data == NULL)
5432 goto out;
5433
5434 if (S_ISFIFO(mode))
5435 data->arg.ftype = NF4FIFO;
5436 else if (S_ISBLK(mode)) {
5437 data->arg.ftype = NF4BLK;
5438 data->arg.u.device.specdata1 = MAJOR(rdev);
5439 data->arg.u.device.specdata2 = MINOR(rdev);
5440 }
5441 else if (S_ISCHR(mode)) {
5442 data->arg.ftype = NF4CHR;
5443 data->arg.u.device.specdata1 = MAJOR(rdev);
5444 data->arg.u.device.specdata2 = MINOR(rdev);
5445 } else if (!S_ISSOCK(mode)) {
5446 status = -EINVAL;
5447 goto out_free;
5448 }
5449
5450 data->arg.label = label;
5451 status = nfs4_do_create(dir, dentry, data);
5452 out_free:
5453 nfs4_free_createdata(data);
5454 out:
5455 return status;
5456 }
5457
nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)5458 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5459 struct iattr *sattr, dev_t rdev)
5460 {
5461 struct nfs_server *server = NFS_SERVER(dir);
5462 struct nfs4_exception exception = {
5463 .interruptible = true,
5464 };
5465 struct nfs4_label l, *label;
5466 int err;
5467
5468 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5469
5470 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5471 sattr->ia_mode &= ~current_umask();
5472 do {
5473 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5474 trace_nfs4_mknod(dir, &dentry->d_name, err);
5475 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5476 &exception);
5477 } while (exception.retry);
5478
5479 nfs4_label_release_security(label);
5480
5481 return err;
5482 }
5483
_nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5484 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5485 struct nfs_fsstat *fsstat)
5486 {
5487 struct nfs4_statfs_arg args = {
5488 .fh = fhandle,
5489 .bitmask = server->attr_bitmask,
5490 };
5491 struct nfs4_statfs_res res = {
5492 .fsstat = fsstat,
5493 };
5494 struct rpc_message msg = {
5495 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5496 .rpc_argp = &args,
5497 .rpc_resp = &res,
5498 };
5499
5500 nfs_fattr_init(fsstat->fattr);
5501 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5502 }
5503
nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5504 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5505 {
5506 struct nfs4_exception exception = {
5507 .interruptible = true,
5508 };
5509 int err;
5510 do {
5511 err = nfs4_handle_exception(server,
5512 _nfs4_proc_statfs(server, fhandle, fsstat),
5513 &exception);
5514 } while (exception.retry);
5515 return err;
5516 }
5517
_nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5518 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5519 struct nfs_fsinfo *fsinfo)
5520 {
5521 struct nfs4_fsinfo_arg args = {
5522 .fh = fhandle,
5523 .bitmask = server->attr_bitmask,
5524 };
5525 struct nfs4_fsinfo_res res = {
5526 .fsinfo = fsinfo,
5527 };
5528 struct rpc_message msg = {
5529 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5530 .rpc_argp = &args,
5531 .rpc_resp = &res,
5532 };
5533
5534 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5535 }
5536
nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5537 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5538 {
5539 struct nfs4_exception exception = {
5540 .interruptible = true,
5541 };
5542 int err;
5543
5544 do {
5545 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5546 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5547 if (err == 0) {
5548 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time);
5549 break;
5550 }
5551 err = nfs4_handle_exception(server, err, &exception);
5552 } while (exception.retry);
5553 return err;
5554 }
5555
nfs4_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5556 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5557 {
5558 int error;
5559
5560 nfs_fattr_init(fsinfo->fattr);
5561 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5562 if (error == 0) {
5563 /* block layout checks this! */
5564 server->pnfs_blksize = fsinfo->blksize;
5565 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5566 }
5567
5568 return error;
5569 }
5570
_nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5571 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5572 struct nfs_pathconf *pathconf)
5573 {
5574 struct nfs4_pathconf_arg args = {
5575 .fh = fhandle,
5576 .bitmask = server->attr_bitmask,
5577 };
5578 struct nfs4_pathconf_res res = {
5579 .pathconf = pathconf,
5580 };
5581 struct rpc_message msg = {
5582 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5583 .rpc_argp = &args,
5584 .rpc_resp = &res,
5585 };
5586
5587 /* None of the pathconf attributes are mandatory to implement */
5588 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5589 memset(pathconf, 0, sizeof(*pathconf));
5590 return 0;
5591 }
5592
5593 nfs_fattr_init(pathconf->fattr);
5594 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5595 }
5596
nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5597 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5598 struct nfs_pathconf *pathconf)
5599 {
5600 struct nfs4_exception exception = {
5601 .interruptible = true,
5602 };
5603 int err;
5604
5605 do {
5606 err = nfs4_handle_exception(server,
5607 _nfs4_proc_pathconf(server, fhandle, pathconf),
5608 &exception);
5609 } while (exception.retry);
5610 return err;
5611 }
5612
nfs4_set_rw_stateid(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5613 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5614 const struct nfs_open_context *ctx,
5615 const struct nfs_lock_context *l_ctx,
5616 fmode_t fmode)
5617 {
5618 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5619 }
5620 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5621
nfs4_stateid_is_current(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5622 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5623 const struct nfs_open_context *ctx,
5624 const struct nfs_lock_context *l_ctx,
5625 fmode_t fmode)
5626 {
5627 nfs4_stateid _current_stateid;
5628
5629 /* If the current stateid represents a lost lock, then exit */
5630 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5631 return true;
5632 return nfs4_stateid_match(stateid, &_current_stateid);
5633 }
5634
nfs4_error_stateid_expired(int err)5635 static bool nfs4_error_stateid_expired(int err)
5636 {
5637 switch (err) {
5638 case -NFS4ERR_DELEG_REVOKED:
5639 case -NFS4ERR_ADMIN_REVOKED:
5640 case -NFS4ERR_BAD_STATEID:
5641 case -NFS4ERR_STALE_STATEID:
5642 case -NFS4ERR_OLD_STATEID:
5643 case -NFS4ERR_OPENMODE:
5644 case -NFS4ERR_EXPIRED:
5645 return true;
5646 }
5647 return false;
5648 }
5649
nfs4_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5650 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5651 {
5652 struct nfs_server *server = NFS_SERVER(hdr->inode);
5653
5654 trace_nfs4_read(hdr, task->tk_status);
5655 if (task->tk_status < 0) {
5656 struct nfs4_exception exception = {
5657 .inode = hdr->inode,
5658 .state = hdr->args.context->state,
5659 .stateid = &hdr->args.stateid,
5660 .retrans = hdr->retrans,
5661 };
5662 task->tk_status = nfs4_async_handle_exception(task,
5663 server, task->tk_status, &exception);
5664 hdr->retrans = exception.retrans;
5665 if (exception.retry) {
5666 rpc_restart_call_prepare(task);
5667 return -EAGAIN;
5668 }
5669 }
5670
5671 if (task->tk_status > 0)
5672 renew_lease(server, hdr->timestamp);
5673 return 0;
5674 }
5675
nfs4_read_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5676 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5677 struct nfs_pgio_args *args)
5678 {
5679
5680 if (!nfs4_error_stateid_expired(task->tk_status) ||
5681 nfs4_stateid_is_current(&args->stateid,
5682 args->context,
5683 args->lock_context,
5684 FMODE_READ))
5685 return false;
5686 rpc_restart_call_prepare(task);
5687 return true;
5688 }
5689
nfs4_read_plus_not_supported(struct rpc_task * task,struct nfs_pgio_header * hdr)5690 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5691 struct nfs_pgio_header *hdr)
5692 {
5693 struct nfs_server *server = NFS_SERVER(hdr->inode);
5694 struct rpc_message *msg = &task->tk_msg;
5695
5696 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5697 task->tk_status == -ENOTSUPP) {
5698 server->caps &= ~NFS_CAP_READ_PLUS;
5699 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5700 rpc_restart_call_prepare(task);
5701 return true;
5702 }
5703 return false;
5704 }
5705
nfs4_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5706 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5707 {
5708 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5709 return -EAGAIN;
5710 if (nfs4_read_stateid_changed(task, &hdr->args))
5711 return -EAGAIN;
5712 if (nfs4_read_plus_not_supported(task, hdr))
5713 return -EAGAIN;
5714 if (task->tk_status > 0)
5715 nfs_invalidate_atime(hdr->inode);
5716 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5717 nfs4_read_done_cb(task, hdr);
5718 }
5719
5720 #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)5721 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5722 struct rpc_message *msg)
5723 {
5724 /* Note: We don't use READ_PLUS with pNFS yet */
5725 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5726 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5727 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5728 }
5729 return false;
5730 }
5731 #else
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5732 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5733 struct rpc_message *msg)
5734 {
5735 return false;
5736 }
5737 #endif /* CONFIG_NFS_V4_2 */
5738
nfs4_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)5739 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5740 struct rpc_message *msg)
5741 {
5742 hdr->timestamp = jiffies;
5743 if (!hdr->pgio_done_cb)
5744 hdr->pgio_done_cb = nfs4_read_done_cb;
5745 if (!nfs42_read_plus_support(hdr, msg))
5746 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5747 nfs4_init_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5748 &hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5749 }
5750
nfs4_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)5751 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5752 struct nfs_pgio_header *hdr)
5753 {
5754 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5755 &hdr->args.seq_args,
5756 &hdr->res.seq_res,
5757 task))
5758 return 0;
5759 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5760 hdr->args.lock_context,
5761 hdr->rw_mode) == -EIO)
5762 return -EIO;
5763 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5764 return -EIO;
5765 return 0;
5766 }
5767
nfs4_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5768 static int nfs4_write_done_cb(struct rpc_task *task,
5769 struct nfs_pgio_header *hdr)
5770 {
5771 struct inode *inode = hdr->inode;
5772
5773 trace_nfs4_write(hdr, task->tk_status);
5774 if (task->tk_status < 0) {
5775 struct nfs4_exception exception = {
5776 .inode = hdr->inode,
5777 .state = hdr->args.context->state,
5778 .stateid = &hdr->args.stateid,
5779 .retrans = hdr->retrans,
5780 };
5781 task->tk_status = nfs4_async_handle_exception(task,
5782 NFS_SERVER(inode), task->tk_status,
5783 &exception);
5784 hdr->retrans = exception.retrans;
5785 if (exception.retry) {
5786 rpc_restart_call_prepare(task);
5787 return -EAGAIN;
5788 }
5789 }
5790 if (task->tk_status >= 0) {
5791 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5792 nfs_writeback_update_inode(hdr);
5793 }
5794 return 0;
5795 }
5796
nfs4_write_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5797 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5798 struct nfs_pgio_args *args)
5799 {
5800
5801 if (!nfs4_error_stateid_expired(task->tk_status) ||
5802 nfs4_stateid_is_current(&args->stateid,
5803 args->context,
5804 args->lock_context,
5805 FMODE_WRITE))
5806 return false;
5807 rpc_restart_call_prepare(task);
5808 return true;
5809 }
5810
nfs4_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5811 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5812 {
5813 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5814 return -EAGAIN;
5815 if (nfs4_write_stateid_changed(task, &hdr->args))
5816 return -EAGAIN;
5817 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5818 nfs4_write_done_cb(task, hdr);
5819 }
5820
5821 static
nfs4_write_need_cache_consistency_data(struct nfs_pgio_header * hdr)5822 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5823 {
5824 /* Don't request attributes for pNFS or O_DIRECT writes */
5825 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5826 return false;
5827 /* Otherwise, request attributes if and only if we don't hold
5828 * a delegation
5829 */
5830 return nfs4_have_delegation(hdr->inode, FMODE_READ, 0) == 0;
5831 }
5832
nfs4_bitmask_set(__u32 bitmask[],const __u32 src[],struct inode * inode,unsigned long cache_validity)5833 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5834 struct inode *inode, unsigned long cache_validity)
5835 {
5836 struct nfs_server *server = NFS_SERVER(inode);
5837 unsigned int i;
5838
5839 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5840 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5841
5842 if (cache_validity & NFS_INO_INVALID_CHANGE)
5843 bitmask[0] |= FATTR4_WORD0_CHANGE;
5844 if (cache_validity & NFS_INO_INVALID_ATIME)
5845 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5846 if (cache_validity & NFS_INO_INVALID_MODE)
5847 bitmask[1] |= FATTR4_WORD1_MODE;
5848 if (cache_validity & NFS_INO_INVALID_OTHER)
5849 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5850 if (cache_validity & NFS_INO_INVALID_NLINK)
5851 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5852 if (cache_validity & NFS_INO_INVALID_CTIME)
5853 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5854 if (cache_validity & NFS_INO_INVALID_MTIME)
5855 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5856 if (cache_validity & NFS_INO_INVALID_BLOCKS)
5857 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5858 if (cache_validity & NFS_INO_INVALID_BTIME)
5859 bitmask[1] |= FATTR4_WORD1_TIME_CREATE;
5860 /*
5861 * uncacheable_file_data (attr 87) applies only to regular files; a
5862 * directory can reach here via DELEGRETURN of a directory delegation.
5863 */
5864 if ((cache_validity & NFS_INO_INVALID_UNCACHEABLE_FILE_DATA) &&
5865 S_ISREG(inode->i_mode))
5866 bitmask[2] |= FATTR4_WORD2_UNCACHEABLE_FILE_DATA;
5867
5868 if (cache_validity & NFS_INO_INVALID_SIZE)
5869 bitmask[0] |= FATTR4_WORD0_SIZE;
5870
5871 for (i = 0; i < NFS4_BITMASK_SZ; i++)
5872 bitmask[i] &= server->attr_bitmask[i];
5873 }
5874
nfs4_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)5875 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5876 struct rpc_message *msg,
5877 struct rpc_clnt **clnt)
5878 {
5879 struct nfs_server *server = NFS_SERVER(hdr->inode);
5880
5881 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5882 hdr->args.bitmask = NULL;
5883 hdr->res.fattr = NULL;
5884 } else {
5885 nfs4_bitmask_set(hdr->args.bitmask_store,
5886 server->cache_consistency_bitmask,
5887 hdr->inode, NFS_INO_INVALID_BLOCKS);
5888 hdr->args.bitmask = hdr->args.bitmask_store;
5889 }
5890
5891 if (!hdr->pgio_done_cb)
5892 hdr->pgio_done_cb = nfs4_write_done_cb;
5893 hdr->res.server = server;
5894 hdr->timestamp = jiffies;
5895
5896 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5897 nfs4_init_sequence(server->nfs_client, &hdr->args.seq_args,
5898 &hdr->res.seq_res, 0, 0);
5899 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5900 }
5901
nfs4_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)5902 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5903 {
5904 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5905 &data->args.seq_args,
5906 &data->res.seq_res,
5907 task);
5908 }
5909
nfs4_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)5910 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5911 {
5912 struct inode *inode = data->inode;
5913
5914 trace_nfs4_commit(data, task->tk_status);
5915 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5916 NULL, NULL) == -EAGAIN) {
5917 rpc_restart_call_prepare(task);
5918 return -EAGAIN;
5919 }
5920 return 0;
5921 }
5922
nfs4_commit_done(struct rpc_task * task,struct nfs_commit_data * data)5923 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5924 {
5925 if (!nfs4_sequence_done(task, &data->res.seq_res))
5926 return -EAGAIN;
5927 return data->commit_done_cb(task, data);
5928 }
5929
nfs4_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)5930 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5931 struct rpc_clnt **clnt)
5932 {
5933 struct nfs_server *server = NFS_SERVER(data->inode);
5934
5935 if (data->commit_done_cb == NULL)
5936 data->commit_done_cb = nfs4_commit_done_cb;
5937 data->res.server = server;
5938 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5939 nfs4_init_sequence(server->nfs_client, &data->args.seq_args,
5940 &data->res.seq_res, 1, 0);
5941 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5942 NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5943 }
5944
_nfs4_proc_commit(struct file * dst,struct nfs_commitargs * args,struct nfs_commitres * res)5945 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5946 struct nfs_commitres *res)
5947 {
5948 struct inode *dst_inode = file_inode(dst);
5949 struct nfs_server *server = NFS_SERVER(dst_inode);
5950 struct rpc_message msg = {
5951 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5952 .rpc_argp = args,
5953 .rpc_resp = res,
5954 };
5955
5956 args->fh = NFS_FH(dst_inode);
5957 return nfs4_call_sync(server->client, server, &msg,
5958 &args->seq_args, &res->seq_res, 1);
5959 }
5960
nfs4_proc_commit(struct file * dst,__u64 offset,__u32 count,struct nfs_commitres * res)5961 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5962 {
5963 struct nfs_commitargs args = {
5964 .offset = offset,
5965 .count = count,
5966 };
5967 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5968 struct nfs4_exception exception = { };
5969 int status;
5970
5971 do {
5972 status = _nfs4_proc_commit(dst, &args, res);
5973 status = nfs4_handle_exception(dst_server, status, &exception);
5974 } while (exception.retry);
5975
5976 return status;
5977 }
5978
nfs4_server_supports_acls(const struct nfs_server * server,enum nfs4_acl_type type)5979 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5980 enum nfs4_acl_type type)
5981 {
5982 switch (type) {
5983 default:
5984 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5985 case NFS4ACL_DACL:
5986 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5987 case NFS4ACL_SACL:
5988 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5989 }
5990 }
5991
5992 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5993 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5994 * the stack.
5995 */
5996 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5997
nfs4_buf_to_pages_noslab(const void * buf,size_t buflen,struct page ** pages)5998 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5999 struct page **pages)
6000 {
6001 struct page *newpage, **spages;
6002 int rc = 0;
6003 size_t len;
6004 spages = pages;
6005
6006 do {
6007 len = min_t(size_t, PAGE_SIZE, buflen);
6008 newpage = alloc_page(GFP_KERNEL);
6009
6010 if (newpage == NULL)
6011 goto unwind;
6012 memcpy(page_address(newpage), buf, len);
6013 buf += len;
6014 buflen -= len;
6015 *pages++ = newpage;
6016 rc++;
6017 } while (buflen != 0);
6018
6019 return rc;
6020
6021 unwind:
6022 for(; rc > 0; rc--)
6023 __free_page(spages[rc-1]);
6024 return -ENOMEM;
6025 }
6026
6027 struct nfs4_cached_acl {
6028 enum nfs4_acl_type type;
6029 int cached;
6030 size_t len;
6031 char data[];
6032 };
6033
nfs4_set_cached_acl(struct inode * inode,struct nfs4_cached_acl * acl)6034 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
6035 {
6036 struct nfs_inode *nfsi = NFS_I(inode);
6037
6038 spin_lock(&inode->i_lock);
6039 kfree(nfsi->nfs4_acl);
6040 nfsi->nfs4_acl = acl;
6041 spin_unlock(&inode->i_lock);
6042 }
6043
nfs4_zap_acl_attr(struct inode * inode)6044 static void nfs4_zap_acl_attr(struct inode *inode)
6045 {
6046 nfs4_set_cached_acl(inode, NULL);
6047 }
6048
nfs4_read_cached_acl(struct inode * inode,char * buf,size_t buflen,enum nfs4_acl_type type)6049 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
6050 size_t buflen, enum nfs4_acl_type type)
6051 {
6052 struct nfs_inode *nfsi = NFS_I(inode);
6053 struct nfs4_cached_acl *acl;
6054 int ret = -ENOENT;
6055
6056 spin_lock(&inode->i_lock);
6057 acl = nfsi->nfs4_acl;
6058 if (acl == NULL)
6059 goto out;
6060 if (acl->type != type)
6061 goto out;
6062 if (buf == NULL) /* user is just asking for length */
6063 goto out_len;
6064 if (acl->cached == 0)
6065 goto out;
6066 ret = -ERANGE; /* see getxattr(2) man page */
6067 if (acl->len > buflen)
6068 goto out;
6069 memcpy(buf, acl->data, acl->len);
6070 out_len:
6071 ret = acl->len;
6072 out:
6073 spin_unlock(&inode->i_lock);
6074 return ret;
6075 }
6076
nfs4_write_cached_acl(struct inode * inode,struct page ** pages,size_t pgbase,size_t acl_len,enum nfs4_acl_type type)6077 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
6078 size_t pgbase, size_t acl_len,
6079 enum nfs4_acl_type type)
6080 {
6081 struct nfs4_cached_acl *acl;
6082 size_t buflen = sizeof(*acl) + acl_len;
6083
6084 if (buflen <= PAGE_SIZE) {
6085 acl = kmalloc(buflen, GFP_KERNEL);
6086 if (acl == NULL)
6087 goto out;
6088 acl->cached = 1;
6089 _copy_from_pages(acl->data, pages, pgbase, acl_len);
6090 } else {
6091 acl = kmalloc_obj(*acl);
6092 if (acl == NULL)
6093 goto out;
6094 acl->cached = 0;
6095 }
6096 acl->type = type;
6097 acl->len = acl_len;
6098 out:
6099 nfs4_set_cached_acl(inode, acl);
6100 }
6101
6102 /*
6103 * The getxattr API returns the required buffer length when called with a
6104 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
6105 * the required buf. On a NULL buf, we send a page of data to the server
6106 * guessing that the ACL request can be serviced by a page. If so, we cache
6107 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
6108 * the cache. If not so, we throw away the page, and cache the required
6109 * length. The next getxattr call will then produce another round trip to
6110 * the server, this time with the input buf of the required size.
6111 */
__nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6112 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
6113 size_t buflen, enum nfs4_acl_type type)
6114 {
6115 struct page **pages;
6116 struct nfs_getaclargs args = {
6117 .fh = NFS_FH(inode),
6118 .acl_type = type,
6119 .acl_len = buflen,
6120 };
6121 struct nfs_getaclres res = {
6122 .acl_type = type,
6123 .acl_len = buflen,
6124 };
6125 struct rpc_message msg = {
6126 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
6127 .rpc_argp = &args,
6128 .rpc_resp = &res,
6129 };
6130 unsigned int npages;
6131 int ret = -ENOMEM, i;
6132 struct nfs_server *server = NFS_SERVER(inode);
6133
6134 if (buflen == 0)
6135 buflen = server->rsize;
6136
6137 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
6138 pages = kmalloc_objs(struct page *, npages);
6139 if (!pages)
6140 return -ENOMEM;
6141
6142 args.acl_pages = pages;
6143
6144 for (i = 0; i < npages; i++) {
6145 pages[i] = alloc_page(GFP_KERNEL);
6146 if (!pages[i])
6147 goto out_free;
6148 }
6149
6150 /* for decoding across pages */
6151 res.acl_scratch = folio_alloc(GFP_KERNEL, 0);
6152 if (!res.acl_scratch)
6153 goto out_free;
6154
6155 args.acl_len = npages * PAGE_SIZE;
6156
6157 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
6158 __func__, buf, buflen, npages, args.acl_len);
6159 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6160 &msg, &args.seq_args, &res.seq_res, 0);
6161 if (ret)
6162 goto out_free;
6163
6164 /* Handle the case where the passed-in buffer is too short */
6165 if (res.acl_flags & NFS4_ACL_TRUNC) {
6166 /* Did the user only issue a request for the acl length? */
6167 if (buf == NULL)
6168 goto out_ok;
6169 ret = -ERANGE;
6170 goto out_free;
6171 }
6172 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6173 type);
6174 if (buf) {
6175 if (res.acl_len > buflen) {
6176 ret = -ERANGE;
6177 goto out_free;
6178 }
6179 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6180 }
6181 out_ok:
6182 ret = res.acl_len;
6183 out_free:
6184 while (--i >= 0)
6185 __free_page(pages[i]);
6186 if (res.acl_scratch)
6187 folio_put(res.acl_scratch);
6188 kfree(pages);
6189 return ret;
6190 }
6191
nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6192 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6193 size_t buflen, enum nfs4_acl_type type)
6194 {
6195 struct nfs4_exception exception = {
6196 .interruptible = true,
6197 };
6198 ssize_t ret;
6199 do {
6200 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6201 trace_nfs4_get_acl(inode, ret);
6202 if (ret >= 0)
6203 break;
6204 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6205 } while (exception.retry);
6206 return ret;
6207 }
6208
nfs4_proc_get_acl(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6209 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6210 enum nfs4_acl_type type)
6211 {
6212 struct nfs_server *server = NFS_SERVER(inode);
6213 int ret;
6214
6215 if (unlikely(NFS_FH(inode)->size == 0))
6216 return -ENODATA;
6217 if (!nfs4_server_supports_acls(server, type))
6218 return -EOPNOTSUPP;
6219 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6220 if (ret < 0)
6221 return ret;
6222 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6223 nfs_zap_acl_cache(inode);
6224 ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6225 if (ret != -ENOENT)
6226 /* -ENOENT is returned if there is no ACL or if there is an ACL
6227 * but no cached acl data, just the acl length */
6228 return ret;
6229 return nfs4_get_acl_uncached(inode, buf, buflen, type);
6230 }
6231
__nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6232 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6233 size_t buflen, enum nfs4_acl_type type)
6234 {
6235 struct nfs_server *server = NFS_SERVER(inode);
6236 struct page *pages[NFS4ACL_MAXPAGES];
6237 struct nfs_setaclargs arg = {
6238 .fh = NFS_FH(inode),
6239 .acl_type = type,
6240 .acl_len = buflen,
6241 .acl_pages = pages,
6242 };
6243 struct nfs_setaclres res;
6244 struct rpc_message msg = {
6245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6246 .rpc_argp = &arg,
6247 .rpc_resp = &res,
6248 };
6249 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6250 int ret, i;
6251
6252 /* You can't remove system.nfs4_acl: */
6253 if (buflen == 0)
6254 return -EINVAL;
6255 if (!nfs4_server_supports_acls(server, type))
6256 return -EOPNOTSUPP;
6257 if (npages > ARRAY_SIZE(pages))
6258 return -ERANGE;
6259 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6260 if (i < 0)
6261 return i;
6262 nfs4_inode_make_writeable(inode);
6263 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6264
6265 /*
6266 * Free each page after tx, so the only ref left is
6267 * held by the network stack
6268 */
6269 for (; i > 0; i--)
6270 put_page(pages[i-1]);
6271
6272 /*
6273 * Acl update can result in inode attribute update.
6274 * so mark the attribute cache invalid.
6275 */
6276 spin_lock(&inode->i_lock);
6277 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6278 NFS_INO_INVALID_CTIME |
6279 NFS_INO_REVAL_FORCED);
6280 spin_unlock(&inode->i_lock);
6281 nfs_access_zap_cache(inode);
6282 nfs_zap_acl_cache(inode);
6283 return ret;
6284 }
6285
nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6286 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6287 size_t buflen, enum nfs4_acl_type type)
6288 {
6289 struct nfs4_exception exception = { };
6290 int err;
6291
6292 if (unlikely(NFS_FH(inode)->size == 0))
6293 return -ENODATA;
6294 do {
6295 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6296 trace_nfs4_set_acl(inode, err);
6297 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6298 /*
6299 * no need to retry since the kernel
6300 * isn't involved in encoding the ACEs.
6301 */
6302 err = -EINVAL;
6303 break;
6304 }
6305 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6306 &exception);
6307 } while (exception.retry);
6308 return err;
6309 }
6310
6311 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
_nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6312 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6313 size_t buflen)
6314 {
6315 struct nfs_server *server = NFS_SERVER(inode);
6316 struct nfs4_label label = {0, 0, 0, buflen, buf};
6317
6318 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6319 struct nfs_fattr fattr = {
6320 .label = &label,
6321 };
6322 struct nfs4_getattr_arg arg = {
6323 .fh = NFS_FH(inode),
6324 .bitmask = bitmask,
6325 };
6326 struct nfs4_getattr_res res = {
6327 .fattr = &fattr,
6328 .server = server,
6329 };
6330 struct rpc_message msg = {
6331 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6332 .rpc_argp = &arg,
6333 .rpc_resp = &res,
6334 };
6335 int ret;
6336
6337 nfs_fattr_init(&fattr);
6338
6339 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6340 if (ret)
6341 return ret;
6342 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6343 return -ENOENT;
6344 return label.len;
6345 }
6346
nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6347 static int nfs4_get_security_label(struct inode *inode, void *buf,
6348 size_t buflen)
6349 {
6350 struct nfs4_exception exception = {
6351 .interruptible = true,
6352 };
6353 int err;
6354
6355 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6356 return -EOPNOTSUPP;
6357
6358 do {
6359 err = _nfs4_get_security_label(inode, buf, buflen);
6360 trace_nfs4_get_security_label(inode, err);
6361 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6362 &exception);
6363 } while (exception.retry);
6364 return err;
6365 }
6366
_nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6367 static int _nfs4_do_set_security_label(struct inode *inode,
6368 struct nfs4_label *ilabel,
6369 struct nfs_fattr *fattr)
6370 {
6371
6372 struct iattr sattr = {0};
6373 struct nfs_server *server = NFS_SERVER(inode);
6374 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6375 struct nfs_setattrargs arg = {
6376 .fh = NFS_FH(inode),
6377 .iap = &sattr,
6378 .server = server,
6379 .bitmask = bitmask,
6380 .label = ilabel,
6381 };
6382 struct nfs_setattrres res = {
6383 .fattr = fattr,
6384 .server = server,
6385 };
6386 struct rpc_message msg = {
6387 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6388 .rpc_argp = &arg,
6389 .rpc_resp = &res,
6390 };
6391 int status;
6392
6393 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6394
6395 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6396 if (status)
6397 dprintk("%s failed: %d\n", __func__, status);
6398
6399 return status;
6400 }
6401
nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6402 static int nfs4_do_set_security_label(struct inode *inode,
6403 struct nfs4_label *ilabel,
6404 struct nfs_fattr *fattr)
6405 {
6406 struct nfs4_exception exception = { };
6407 int err;
6408
6409 do {
6410 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6411 trace_nfs4_set_security_label(inode, err);
6412 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6413 &exception);
6414 } while (exception.retry);
6415 return err;
6416 }
6417
6418 static int
nfs4_set_security_label(struct inode * inode,const void * buf,size_t buflen)6419 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6420 {
6421 struct nfs4_label ilabel = {0, 0, 0, buflen, (char *)buf };
6422 struct nfs_fattr *fattr;
6423 int status;
6424
6425 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6426 return -EOPNOTSUPP;
6427
6428 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6429 if (fattr == NULL)
6430 return -ENOMEM;
6431
6432 status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6433 if (status == 0)
6434 nfs_setsecurity(inode, fattr);
6435
6436 nfs_free_fattr(fattr);
6437 return status;
6438 }
6439 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
6440
6441
nfs4_init_boot_verifier(const struct nfs_client * clp,nfs4_verifier * bootverf)6442 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6443 nfs4_verifier *bootverf)
6444 {
6445 __be32 verf[2];
6446
6447 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6448 /* An impossible timestamp guarantees this value
6449 * will never match a generated boot time. */
6450 verf[0] = cpu_to_be32(U32_MAX);
6451 verf[1] = cpu_to_be32(U32_MAX);
6452 } else {
6453 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6454 u64 ns = ktime_to_ns(nn->boot_time);
6455
6456 verf[0] = cpu_to_be32(ns >> 32);
6457 verf[1] = cpu_to_be32(ns);
6458 }
6459 memcpy(bootverf->data, verf, sizeof(bootverf->data));
6460 }
6461
6462 static size_t
nfs4_get_uniquifier(struct nfs_client * clp,char * buf,size_t buflen)6463 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6464 {
6465 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6466 struct nfs_netns_client *nn_clp = nn->nfs_client;
6467 const char *id;
6468
6469 buf[0] = '\0';
6470
6471 if (nn_clp) {
6472 rcu_read_lock();
6473 id = rcu_dereference(nn_clp->identifier);
6474 if (id)
6475 strscpy(buf, id, buflen);
6476 rcu_read_unlock();
6477 }
6478
6479 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6480 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6481
6482 return strlen(buf);
6483 }
6484
6485 static int
nfs4_init_nonuniform_client_string(struct nfs_client * clp)6486 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6487 {
6488 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6489 size_t buflen;
6490 size_t len;
6491 char *str;
6492
6493 if (clp->cl_owner_id != NULL)
6494 return 0;
6495
6496 rcu_read_lock();
6497 len = 14 +
6498 strlen(clp->cl_rpcclient->cl_nodename) +
6499 1 +
6500 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6501 1;
6502 rcu_read_unlock();
6503
6504 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6505 if (buflen)
6506 len += buflen + 1;
6507
6508 if (len > NFS4_OPAQUE_LIMIT + 1)
6509 return -EINVAL;
6510
6511 /*
6512 * Since this string is allocated at mount time, and held until the
6513 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6514 * about a memory-reclaim deadlock.
6515 */
6516 str = kmalloc(len, GFP_KERNEL);
6517 if (!str)
6518 return -ENOMEM;
6519
6520 rcu_read_lock();
6521 if (buflen)
6522 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6523 clp->cl_rpcclient->cl_nodename, buf,
6524 rpc_peeraddr2str(clp->cl_rpcclient,
6525 RPC_DISPLAY_ADDR));
6526 else
6527 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6528 clp->cl_rpcclient->cl_nodename,
6529 rpc_peeraddr2str(clp->cl_rpcclient,
6530 RPC_DISPLAY_ADDR));
6531 rcu_read_unlock();
6532
6533 clp->cl_owner_id = str;
6534 return 0;
6535 }
6536
6537 static int
nfs4_init_uniform_client_string(struct nfs_client * clp)6538 nfs4_init_uniform_client_string(struct nfs_client *clp)
6539 {
6540 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6541 size_t buflen;
6542 size_t len;
6543 char *str;
6544
6545 if (clp->cl_owner_id != NULL)
6546 return 0;
6547
6548 len = 10 + 10 + 1 + 10 + 1 +
6549 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6550
6551 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6552 if (buflen)
6553 len += buflen + 1;
6554
6555 if (len > NFS4_OPAQUE_LIMIT + 1)
6556 return -EINVAL;
6557
6558 /*
6559 * Since this string is allocated at mount time, and held until the
6560 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6561 * about a memory-reclaim deadlock.
6562 */
6563 str = kmalloc(len, GFP_KERNEL);
6564 if (!str)
6565 return -ENOMEM;
6566
6567 if (buflen)
6568 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6569 clp->rpc_ops->version, clp->cl_minorversion,
6570 buf, clp->cl_rpcclient->cl_nodename);
6571 else
6572 scnprintf(str, len, "Linux NFSv%u.%u %s",
6573 clp->rpc_ops->version, clp->cl_minorversion,
6574 clp->cl_rpcclient->cl_nodename);
6575 clp->cl_owner_id = str;
6576 return 0;
6577 }
6578
6579 /*
6580 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6581 * services. Advertise one based on the address family of the
6582 * clientaddr.
6583 */
6584 static unsigned int
nfs4_init_callback_netid(const struct nfs_client * clp,char * buf,size_t len)6585 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6586 {
6587 if (strchr(clp->cl_ipaddr, ':') != NULL)
6588 return scnprintf(buf, len, "tcp6");
6589 else
6590 return scnprintf(buf, len, "tcp");
6591 }
6592
nfs4_setclientid_done(struct rpc_task * task,void * calldata)6593 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6594 {
6595 struct nfs4_setclientid *sc = calldata;
6596
6597 if (task->tk_status == 0)
6598 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6599 }
6600
6601 static const struct rpc_call_ops nfs4_setclientid_ops = {
6602 .rpc_call_done = nfs4_setclientid_done,
6603 };
6604
6605 /**
6606 * nfs4_proc_setclientid - Negotiate client ID
6607 * @clp: state data structure
6608 * @program: RPC program for NFSv4 callback service
6609 * @port: IP port number for NFS4 callback service
6610 * @cred: credential to use for this call
6611 * @res: where to place the result
6612 *
6613 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6614 */
nfs4_proc_setclientid(struct nfs_client * clp,u32 program,unsigned short port,const struct cred * cred,struct nfs4_setclientid_res * res)6615 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6616 unsigned short port, const struct cred *cred,
6617 struct nfs4_setclientid_res *res)
6618 {
6619 nfs4_verifier sc_verifier;
6620 struct nfs4_setclientid setclientid = {
6621 .sc_verifier = &sc_verifier,
6622 .sc_prog = program,
6623 .sc_clnt = clp,
6624 };
6625 struct rpc_message msg = {
6626 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6627 .rpc_argp = &setclientid,
6628 .rpc_resp = res,
6629 .rpc_cred = cred,
6630 };
6631 struct rpc_task_setup task_setup_data = {
6632 .rpc_client = clp->cl_rpcclient,
6633 .rpc_message = &msg,
6634 .callback_ops = &nfs4_setclientid_ops,
6635 .callback_data = &setclientid,
6636 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6637 };
6638 unsigned long now = jiffies;
6639 int status;
6640
6641 /* nfs_client_id4 */
6642 nfs4_init_boot_verifier(clp, &sc_verifier);
6643
6644 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6645 status = nfs4_init_uniform_client_string(clp);
6646 else
6647 status = nfs4_init_nonuniform_client_string(clp);
6648
6649 if (status)
6650 goto out;
6651
6652 /* cb_client4 */
6653 setclientid.sc_netid_len =
6654 nfs4_init_callback_netid(clp,
6655 setclientid.sc_netid,
6656 sizeof(setclientid.sc_netid));
6657 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6658 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6659 clp->cl_ipaddr, port >> 8, port & 255);
6660
6661 dprintk("NFS call setclientid auth=%s, '%s'\n",
6662 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6663 clp->cl_owner_id);
6664
6665 status = nfs4_call_sync_custom(&task_setup_data);
6666 if (setclientid.sc_cred) {
6667 kfree(clp->cl_acceptor);
6668 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6669 put_rpccred(setclientid.sc_cred);
6670 }
6671
6672 if (status == 0)
6673 do_renew_lease(clp, now);
6674 out:
6675 trace_nfs4_setclientid(clp, status);
6676 dprintk("NFS reply setclientid: %d\n", status);
6677 return status;
6678 }
6679
6680 /**
6681 * nfs4_proc_setclientid_confirm - Confirm client ID
6682 * @clp: state data structure
6683 * @arg: result of a previous SETCLIENTID
6684 * @cred: credential to use for this call
6685 *
6686 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6687 */
nfs4_proc_setclientid_confirm(struct nfs_client * clp,struct nfs4_setclientid_res * arg,const struct cred * cred)6688 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6689 struct nfs4_setclientid_res *arg,
6690 const struct cred *cred)
6691 {
6692 struct rpc_message msg = {
6693 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6694 .rpc_argp = arg,
6695 .rpc_cred = cred,
6696 };
6697 int status;
6698
6699 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
6700 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6701 clp->cl_clientid);
6702 status = rpc_call_sync(clp->cl_rpcclient, &msg,
6703 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6704 trace_nfs4_setclientid_confirm(clp, status);
6705 dprintk("NFS reply setclientid_confirm: %d\n", status);
6706 return status;
6707 }
6708
6709 struct nfs4_delegreturndata {
6710 struct nfs4_delegreturnargs args;
6711 struct nfs4_delegreturnres res;
6712 struct nfs_fh fh;
6713 nfs4_stateid stateid;
6714 unsigned long timestamp;
6715 unsigned short retrans;
6716 struct {
6717 struct nfs4_layoutreturn_args arg;
6718 struct nfs4_layoutreturn_res res;
6719 struct nfs4_xdr_opaque_data ld_private;
6720 u32 roc_barrier;
6721 bool roc;
6722 } lr;
6723 struct nfs4_delegattr sattr;
6724 struct nfs_fattr fattr;
6725 int rpc_status;
6726 struct inode *inode;
6727 };
6728
nfs4_delegreturn_done(struct rpc_task * task,void * calldata)6729 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6730 {
6731 struct nfs4_delegreturndata *data = calldata;
6732 struct nfs4_exception exception = {
6733 .inode = data->inode,
6734 .stateid = &data->stateid,
6735 .task_is_privileged = data->args.seq_args.sa_privileged,
6736 .retrans = data->retrans,
6737 };
6738
6739 if (!nfs4_sequence_done(task, &data->res.seq_res))
6740 return;
6741
6742 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6743
6744 /* Handle Layoutreturn errors */
6745 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6746 &data->res.lr_ret) == -EAGAIN)
6747 goto out_restart;
6748
6749 if (data->args.sattr_args && task->tk_status != 0) {
6750 switch(data->res.sattr_ret) {
6751 case 0:
6752 data->args.sattr_args = NULL;
6753 data->res.sattr_res = false;
6754 break;
6755 case -NFS4ERR_ADMIN_REVOKED:
6756 case -NFS4ERR_DELEG_REVOKED:
6757 case -NFS4ERR_EXPIRED:
6758 case -NFS4ERR_BAD_STATEID:
6759 /* Let the main handler below do stateid recovery */
6760 break;
6761 case -NFS4ERR_OLD_STATEID:
6762 if (nfs4_refresh_delegation_stateid(&data->stateid,
6763 data->inode))
6764 goto out_restart;
6765 fallthrough;
6766 default:
6767 data->args.sattr_args = NULL;
6768 data->res.sattr_res = false;
6769 goto out_restart;
6770 }
6771 }
6772
6773 switch (task->tk_status) {
6774 case 0:
6775 renew_lease(data->res.server, data->timestamp);
6776 break;
6777 case -NFS4ERR_ADMIN_REVOKED:
6778 case -NFS4ERR_DELEG_REVOKED:
6779 case -NFS4ERR_EXPIRED:
6780 nfs4_free_revoked_stateid(data->res.server,
6781 data->args.stateid,
6782 task->tk_msg.rpc_cred);
6783 fallthrough;
6784 case -NFS4ERR_BAD_STATEID:
6785 case -NFS4ERR_STALE_STATEID:
6786 case -ETIMEDOUT:
6787 task->tk_status = 0;
6788 break;
6789 case -NFS4ERR_OLD_STATEID:
6790 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6791 nfs4_stateid_seqid_inc(&data->stateid);
6792 if (data->args.bitmask) {
6793 data->args.bitmask = NULL;
6794 data->res.fattr = NULL;
6795 }
6796 goto out_restart;
6797 case -NFS4ERR_ACCESS:
6798 if (data->args.bitmask) {
6799 data->args.bitmask = NULL;
6800 data->res.fattr = NULL;
6801 goto out_restart;
6802 }
6803 fallthrough;
6804 default:
6805 task->tk_status = nfs4_async_handle_exception(task,
6806 data->res.server, task->tk_status,
6807 &exception);
6808 data->retrans = exception.retrans;
6809 if (exception.retry)
6810 goto out_restart;
6811 }
6812 nfs_delegation_mark_returned(data->inode, data->args.stateid);
6813 data->rpc_status = task->tk_status;
6814 return;
6815 out_restart:
6816 task->tk_status = 0;
6817 rpc_restart_call_prepare(task);
6818 }
6819
nfs4_delegreturn_release(void * calldata)6820 static void nfs4_delegreturn_release(void *calldata)
6821 {
6822 struct nfs4_delegreturndata *data = calldata;
6823 struct inode *inode = data->inode;
6824
6825 if (data->lr.roc)
6826 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6827 data->res.lr_ret);
6828 if (inode) {
6829 nfs4_fattr_set_prechange(&data->fattr,
6830 inode_peek_iversion_raw(inode));
6831 nfs_refresh_inode(inode, &data->fattr);
6832 nfs_iput_and_deactive(inode);
6833 }
6834 kfree(calldata);
6835 }
6836
nfs4_delegreturn_prepare(struct rpc_task * task,void * data)6837 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6838 {
6839 struct nfs4_delegreturndata *d_data;
6840 struct pnfs_layout_hdr *lo;
6841
6842 d_data = data;
6843
6844 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6845 nfs4_sequence_done(task, &d_data->res.seq_res);
6846 return;
6847 }
6848
6849 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6850 if (lo && !pnfs_layout_is_valid(lo)) {
6851 d_data->args.lr_args = NULL;
6852 d_data->res.lr_res = NULL;
6853 }
6854
6855 nfs4_setup_sequence(d_data->res.server->nfs_client,
6856 &d_data->args.seq_args,
6857 &d_data->res.seq_res,
6858 task);
6859 }
6860
6861 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6862 .rpc_call_prepare = nfs4_delegreturn_prepare,
6863 .rpc_call_done = nfs4_delegreturn_done,
6864 .rpc_release = nfs4_delegreturn_release,
6865 };
6866
_nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6867 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6868 const nfs4_stateid *stateid,
6869 struct nfs_delegation *delegation,
6870 int issync)
6871 {
6872 struct nfs4_delegreturndata *data;
6873 struct nfs_server *server = NFS_SERVER(inode);
6874 struct rpc_task *task;
6875 struct rpc_message msg = {
6876 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6877 .rpc_cred = cred,
6878 };
6879 struct rpc_task_setup task_setup_data = {
6880 .rpc_client = server->client,
6881 .rpc_message = &msg,
6882 .callback_ops = &nfs4_delegreturn_ops,
6883 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6884 };
6885 int status = 0;
6886
6887 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6888 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6889
6890 data = kzalloc_obj(*data);
6891 if (data == NULL)
6892 return -ENOMEM;
6893
6894 nfs4_state_protect(server->nfs_client,
6895 NFS_SP4_MACH_CRED_CLEANUP,
6896 &task_setup_data.rpc_client, &msg);
6897
6898 data->args.fhandle = &data->fh;
6899 data->args.stateid = &data->stateid;
6900 nfs4_bitmask_set(data->args.bitmask_store,
6901 server->cache_consistency_bitmask, inode, 0);
6902 data->args.bitmask = data->args.bitmask_store;
6903 nfs_copy_fh(&data->fh, NFS_FH(inode));
6904 nfs4_stateid_copy(&data->stateid, stateid);
6905 data->res.fattr = &data->fattr;
6906 data->res.server = server;
6907 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6908 data->lr.arg.ld_private = &data->lr.ld_private;
6909 nfs_fattr_init(data->res.fattr);
6910 data->timestamp = jiffies;
6911 data->rpc_status = 0;
6912 data->inode = nfs_igrab_and_active(inode);
6913 if (data->inode || issync) {
6914 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6915 cred, issync);
6916 if (data->lr.roc) {
6917 data->args.lr_args = &data->lr.arg;
6918 data->res.lr_res = &data->lr.res;
6919 }
6920 }
6921
6922 if (delegation &&
6923 test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags)) {
6924 if (delegation->type & FMODE_READ) {
6925 data->sattr.atime = inode_get_atime(inode);
6926 data->sattr.atime_set = true;
6927 }
6928 if (delegation->type & FMODE_WRITE) {
6929 data->sattr.mtime = inode_get_mtime(inode);
6930 data->sattr.mtime_set = true;
6931 }
6932 data->args.sattr_args = &data->sattr;
6933 data->res.sattr_res = true;
6934 }
6935
6936 nfs4_init_sequence(server->nfs_client, &data->args.seq_args,
6937 &data->res.seq_res, 1, !data->inode ? 1 : 0);
6938
6939 task_setup_data.callback_data = data;
6940 msg.rpc_argp = &data->args;
6941 msg.rpc_resp = &data->res;
6942 task = rpc_run_task(&task_setup_data);
6943 if (IS_ERR(task))
6944 return PTR_ERR(task);
6945 if (!issync)
6946 goto out;
6947 status = rpc_wait_for_completion_task(task);
6948 if (status != 0)
6949 goto out;
6950 status = data->rpc_status;
6951 out:
6952 rpc_put_task(task);
6953 return status;
6954 }
6955
nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6956 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6957 const nfs4_stateid *stateid,
6958 struct nfs_delegation *delegation, int issync)
6959 {
6960 struct nfs_server *server = NFS_SERVER(inode);
6961 struct nfs4_exception exception = { };
6962 int err;
6963 do {
6964 err = _nfs4_proc_delegreturn(inode, cred, stateid,
6965 delegation, issync);
6966 trace_nfs4_delegreturn(inode, stateid, err);
6967 switch (err) {
6968 case -NFS4ERR_STALE_STATEID:
6969 case -NFS4ERR_EXPIRED:
6970 case 0:
6971 return 0;
6972 }
6973 err = nfs4_handle_exception(server, err, &exception);
6974 } while (exception.retry);
6975 return err;
6976 }
6977
_nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6978 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6979 {
6980 struct inode *inode = state->inode;
6981 struct nfs_server *server = NFS_SERVER(inode);
6982 struct nfs_client *clp = server->nfs_client;
6983 struct nfs_lockt_args arg = {
6984 .fh = NFS_FH(inode),
6985 .fl = request,
6986 };
6987 struct nfs_lockt_res res = {
6988 .denied = request,
6989 };
6990 struct rpc_message msg = {
6991 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6992 .rpc_argp = &arg,
6993 .rpc_resp = &res,
6994 .rpc_cred = state->owner->so_cred,
6995 };
6996 struct nfs4_lock_state *lsp;
6997 int status;
6998
6999 arg.lock_owner.clientid = clp->cl_clientid;
7000 status = nfs4_set_lock_state(state, request);
7001 if (status != 0)
7002 goto out;
7003 lsp = request->fl_u.nfs4_fl.owner;
7004 arg.lock_owner.id = lsp->ls_seqid.owner_id;
7005 arg.lock_owner.s_dev = server->s_dev;
7006 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
7007 switch (status) {
7008 case 0:
7009 request->c.flc_type = F_UNLCK;
7010 break;
7011 case -NFS4ERR_DENIED:
7012 status = 0;
7013 }
7014 request->fl_ops->fl_release_private(request);
7015 request->fl_ops = NULL;
7016 out:
7017 return status;
7018 }
7019
nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)7020 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7021 {
7022 struct nfs4_exception exception = {
7023 .interruptible = true,
7024 };
7025 int err;
7026
7027 do {
7028 err = _nfs4_proc_getlk(state, cmd, request);
7029 trace_nfs4_get_lock(request, state, cmd, err);
7030 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
7031 &exception);
7032 } while (exception.retry);
7033 return err;
7034 }
7035
7036 /*
7037 * Update the seqid of a lock stateid after receiving
7038 * NFS4ERR_OLD_STATEID
7039 */
nfs4_refresh_lock_old_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)7040 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
7041 struct nfs4_lock_state *lsp)
7042 {
7043 struct nfs4_state *state = lsp->ls_state;
7044 bool ret = false;
7045
7046 spin_lock(&state->state_lock);
7047 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
7048 goto out;
7049 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
7050 nfs4_stateid_seqid_inc(dst);
7051 else
7052 dst->seqid = lsp->ls_stateid.seqid;
7053 ret = true;
7054 out:
7055 spin_unlock(&state->state_lock);
7056 return ret;
7057 }
7058
nfs4_sync_lock_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)7059 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
7060 struct nfs4_lock_state *lsp)
7061 {
7062 struct nfs4_state *state = lsp->ls_state;
7063 bool ret;
7064
7065 spin_lock(&state->state_lock);
7066 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
7067 nfs4_stateid_copy(dst, &lsp->ls_stateid);
7068 spin_unlock(&state->state_lock);
7069 return ret;
7070 }
7071
7072 struct nfs4_unlockdata {
7073 struct nfs_locku_args arg;
7074 struct nfs_locku_res res;
7075 struct nfs4_lock_state *lsp;
7076 struct nfs_open_context *ctx;
7077 struct nfs_lock_context *l_ctx;
7078 struct file_lock fl;
7079 struct nfs_server *server;
7080 unsigned long timestamp;
7081 unsigned short retrans;
7082 };
7083
nfs4_alloc_unlockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7084 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
7085 struct nfs_open_context *ctx,
7086 struct nfs4_lock_state *lsp,
7087 struct nfs_seqid *seqid)
7088 {
7089 struct nfs4_unlockdata *p;
7090 struct nfs4_state *state = lsp->ls_state;
7091 struct inode *inode = state->inode;
7092 struct nfs_lock_context *l_ctx;
7093
7094 p = kzalloc_obj(*p);
7095 if (p == NULL)
7096 return NULL;
7097 l_ctx = nfs_get_lock_context(ctx);
7098 if (!IS_ERR(l_ctx)) {
7099 p->l_ctx = l_ctx;
7100 } else {
7101 kfree(p);
7102 return NULL;
7103 }
7104 p->arg.fh = NFS_FH(inode);
7105 p->arg.fl = &p->fl;
7106 p->arg.seqid = seqid;
7107 p->res.seqid = seqid;
7108 p->lsp = lsp;
7109 /* Ensure we don't close file until we're done freeing locks! */
7110 p->ctx = get_nfs_open_context(ctx);
7111 locks_init_lock(&p->fl);
7112 locks_copy_lock(&p->fl, fl);
7113 p->server = NFS_SERVER(inode);
7114 spin_lock(&state->state_lock);
7115 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
7116 spin_unlock(&state->state_lock);
7117 return p;
7118 }
7119
nfs4_locku_release_calldata(void * data)7120 static void nfs4_locku_release_calldata(void *data)
7121 {
7122 struct nfs4_unlockdata *calldata = data;
7123 nfs_free_seqid(calldata->arg.seqid);
7124 nfs4_put_lock_state(calldata->lsp);
7125 nfs_put_lock_context(calldata->l_ctx);
7126 put_nfs_open_context(calldata->ctx);
7127 kfree(calldata);
7128 }
7129
nfs4_locku_done(struct rpc_task * task,void * data)7130 static void nfs4_locku_done(struct rpc_task *task, void *data)
7131 {
7132 struct nfs4_unlockdata *calldata = data;
7133 struct nfs4_exception exception = {
7134 .inode = calldata->lsp->ls_state->inode,
7135 .stateid = &calldata->arg.stateid,
7136 .retrans = calldata->retrans,
7137 };
7138
7139 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
7140 return;
7141 switch (task->tk_status) {
7142 case 0:
7143 renew_lease(calldata->server, calldata->timestamp);
7144 if (nfs4_update_lock_stateid(calldata->lsp,
7145 &calldata->res.stateid))
7146 break;
7147 fallthrough;
7148 case -NFS4ERR_ADMIN_REVOKED:
7149 case -NFS4ERR_EXPIRED:
7150 nfs4_free_revoked_stateid(calldata->server,
7151 &calldata->arg.stateid,
7152 task->tk_msg.rpc_cred);
7153 fallthrough;
7154 case -NFS4ERR_BAD_STATEID:
7155 case -NFS4ERR_STALE_STATEID:
7156 if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
7157 calldata->lsp))
7158 rpc_restart_call_prepare(task);
7159 break;
7160 case -NFS4ERR_OLD_STATEID:
7161 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
7162 calldata->lsp))
7163 rpc_restart_call_prepare(task);
7164 break;
7165 default:
7166 task->tk_status = nfs4_async_handle_exception(task,
7167 calldata->server, task->tk_status,
7168 &exception);
7169 calldata->retrans = exception.retrans;
7170 if (exception.retry)
7171 rpc_restart_call_prepare(task);
7172 }
7173 nfs_release_seqid(calldata->arg.seqid);
7174 }
7175
nfs4_locku_prepare(struct rpc_task * task,void * data)7176 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
7177 {
7178 struct nfs4_unlockdata *calldata = data;
7179
7180 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
7181 nfs_async_iocounter_wait(task, calldata->l_ctx))
7182 return;
7183
7184 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
7185 goto out_wait;
7186 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
7187 /* Note: exit _without_ running nfs4_locku_done */
7188 goto out_no_action;
7189 }
7190 calldata->timestamp = jiffies;
7191 if (nfs4_setup_sequence(calldata->server->nfs_client,
7192 &calldata->arg.seq_args,
7193 &calldata->res.seq_res,
7194 task) != 0)
7195 nfs_release_seqid(calldata->arg.seqid);
7196 return;
7197 out_no_action:
7198 task->tk_action = NULL;
7199 out_wait:
7200 nfs4_sequence_done(task, &calldata->res.seq_res);
7201 }
7202
7203 static const struct rpc_call_ops nfs4_locku_ops = {
7204 .rpc_call_prepare = nfs4_locku_prepare,
7205 .rpc_call_done = nfs4_locku_done,
7206 .rpc_release = nfs4_locku_release_calldata,
7207 };
7208
nfs4_do_unlck(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7209 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
7210 struct nfs_open_context *ctx,
7211 struct nfs4_lock_state *lsp,
7212 struct nfs_seqid *seqid)
7213 {
7214 struct nfs4_unlockdata *data;
7215 struct nfs_client *clp = NFS_SERVER(lsp->ls_state->inode)->nfs_client;
7216 struct rpc_message msg = {
7217 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
7218 .rpc_cred = ctx->cred,
7219 };
7220 struct rpc_task_setup task_setup_data = {
7221 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7222 .rpc_message = &msg,
7223 .callback_ops = &nfs4_locku_ops,
7224 .workqueue = nfsiod_workqueue,
7225 .flags = RPC_TASK_ASYNC,
7226 };
7227
7228 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7229 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7230
7231 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_CLEANUP,
7232 &task_setup_data.rpc_client, &msg);
7233
7234 /* Ensure this is an unlock - when canceling a lock, the
7235 * canceled lock is passed in, and it won't be an unlock.
7236 */
7237 fl->c.flc_type = F_UNLCK;
7238 if (fl->c.flc_flags & FL_CLOSE)
7239 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7240
7241 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7242 if (data == NULL) {
7243 nfs_free_seqid(seqid);
7244 return ERR_PTR(-ENOMEM);
7245 }
7246
7247 nfs4_init_sequence(clp, &data->arg.seq_args, &data->res.seq_res, 1, 0);
7248 msg.rpc_argp = &data->arg;
7249 msg.rpc_resp = &data->res;
7250 task_setup_data.callback_data = data;
7251 return rpc_run_task(&task_setup_data);
7252 }
7253
nfs4_proc_unlck(struct nfs4_state * state,int cmd,struct file_lock * request)7254 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7255 {
7256 struct inode *inode = state->inode;
7257 struct nfs4_state_owner *sp = state->owner;
7258 struct nfs_inode *nfsi = NFS_I(inode);
7259 struct nfs_seqid *seqid;
7260 struct nfs4_lock_state *lsp;
7261 struct rpc_task *task;
7262 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7263 int status = 0;
7264 unsigned char saved_flags = request->c.flc_flags;
7265
7266 status = nfs4_set_lock_state(state, request);
7267 /* Unlock _before_ we do the RPC call */
7268 request->c.flc_flags |= FL_EXISTS;
7269 /* Exclude nfs_delegation_claim_locks() */
7270 mutex_lock(&sp->so_delegreturn_mutex);
7271 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7272 down_read(&nfsi->rwsem);
7273 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7274 up_read(&nfsi->rwsem);
7275 mutex_unlock(&sp->so_delegreturn_mutex);
7276 goto out;
7277 }
7278 lsp = request->fl_u.nfs4_fl.owner;
7279 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7280 up_read(&nfsi->rwsem);
7281 mutex_unlock(&sp->so_delegreturn_mutex);
7282 if (status != 0)
7283 goto out;
7284 /* Is this a delegated lock? */
7285 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7286 goto out;
7287 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7288 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7289 status = -ENOMEM;
7290 if (IS_ERR(seqid))
7291 goto out;
7292 task = nfs4_do_unlck(request,
7293 nfs_file_open_context(request->c.flc_file),
7294 lsp, seqid);
7295 status = PTR_ERR(task);
7296 if (IS_ERR(task))
7297 goto out;
7298 status = rpc_wait_for_completion_task(task);
7299 rpc_put_task(task);
7300 out:
7301 request->c.flc_flags = saved_flags;
7302 trace_nfs4_unlock(request, state, F_SETLK, status);
7303 return status;
7304 }
7305
7306 struct nfs4_lockdata {
7307 struct nfs_lock_args arg;
7308 struct nfs_lock_res res;
7309 struct nfs4_lock_state *lsp;
7310 struct nfs_open_context *ctx;
7311 struct file_lock fl;
7312 unsigned long timestamp;
7313 int rpc_status;
7314 int cancelled;
7315 struct nfs_server *server;
7316 };
7317
nfs4_alloc_lockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,gfp_t gfp_mask)7318 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7319 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7320 gfp_t gfp_mask)
7321 {
7322 struct nfs4_lockdata *p;
7323 struct inode *inode = lsp->ls_state->inode;
7324 struct nfs_server *server = NFS_SERVER(inode);
7325 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7326
7327 p = kzalloc_obj(*p, gfp_mask);
7328 if (p == NULL)
7329 return NULL;
7330
7331 p->arg.fh = NFS_FH(inode);
7332 p->arg.fl = &p->fl;
7333 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7334 if (IS_ERR(p->arg.open_seqid))
7335 goto out_free;
7336 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7337 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7338 if (IS_ERR(p->arg.lock_seqid))
7339 goto out_free_seqid;
7340 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7341 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7342 p->arg.lock_owner.s_dev = server->s_dev;
7343 p->res.lock_seqid = p->arg.lock_seqid;
7344 p->lsp = lsp;
7345 p->server = server;
7346 p->ctx = get_nfs_open_context(ctx);
7347 locks_init_lock(&p->fl);
7348 locks_copy_lock(&p->fl, fl);
7349 return p;
7350 out_free_seqid:
7351 nfs_free_seqid(p->arg.open_seqid);
7352 out_free:
7353 kfree(p);
7354 return NULL;
7355 }
7356
nfs4_lock_prepare(struct rpc_task * task,void * calldata)7357 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7358 {
7359 struct nfs4_lockdata *data = calldata;
7360 struct nfs4_state *state = data->lsp->ls_state;
7361
7362 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7363 goto out_wait;
7364 /* Do we need to do an open_to_lock_owner? */
7365 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7366 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7367 goto out_release_lock_seqid;
7368 }
7369 nfs4_stateid_copy(&data->arg.open_stateid,
7370 &state->open_stateid);
7371 data->arg.new_lock_owner = 1;
7372 data->res.open_seqid = data->arg.open_seqid;
7373 } else {
7374 data->arg.new_lock_owner = 0;
7375 nfs4_stateid_copy(&data->arg.lock_stateid,
7376 &data->lsp->ls_stateid);
7377 }
7378 if (!nfs4_valid_open_stateid(state)) {
7379 data->rpc_status = -EBADF;
7380 task->tk_action = NULL;
7381 goto out_release_open_seqid;
7382 }
7383 data->timestamp = jiffies;
7384 if (nfs4_setup_sequence(data->server->nfs_client,
7385 &data->arg.seq_args,
7386 &data->res.seq_res,
7387 task) == 0)
7388 return;
7389 out_release_open_seqid:
7390 nfs_release_seqid(data->arg.open_seqid);
7391 out_release_lock_seqid:
7392 nfs_release_seqid(data->arg.lock_seqid);
7393 out_wait:
7394 nfs4_sequence_done(task, &data->res.seq_res);
7395 dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7396 }
7397
nfs4_lock_done(struct rpc_task * task,void * calldata)7398 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7399 {
7400 struct nfs4_lockdata *data = calldata;
7401 struct nfs4_lock_state *lsp = data->lsp;
7402
7403 if (!nfs4_sequence_done(task, &data->res.seq_res))
7404 return;
7405
7406 data->rpc_status = task->tk_status;
7407 switch (task->tk_status) {
7408 case 0:
7409 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7410 data->timestamp);
7411 if (data->arg.new_lock_owner != 0) {
7412 nfs_confirm_seqid(&lsp->ls_seqid, 0);
7413 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7414 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7415 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7416 goto out_restart;
7417 break;
7418 case -NFS4ERR_OLD_STATEID:
7419 if (data->arg.new_lock_owner != 0 &&
7420 nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7421 lsp->ls_state))
7422 goto out_restart;
7423 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7424 goto out_restart;
7425 fallthrough;
7426 case -NFS4ERR_BAD_STATEID:
7427 case -NFS4ERR_STALE_STATEID:
7428 case -NFS4ERR_EXPIRED:
7429 if (data->arg.new_lock_owner != 0) {
7430 if (!nfs4_stateid_match(&data->arg.open_stateid,
7431 &lsp->ls_state->open_stateid))
7432 goto out_restart;
7433 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7434 &lsp->ls_stateid))
7435 goto out_restart;
7436 }
7437 out_done:
7438 dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7439 return;
7440 out_restart:
7441 if (!data->cancelled)
7442 rpc_restart_call_prepare(task);
7443 goto out_done;
7444 }
7445
nfs4_lock_release(void * calldata)7446 static void nfs4_lock_release(void *calldata)
7447 {
7448 struct nfs4_lockdata *data = calldata;
7449
7450 nfs_free_seqid(data->arg.open_seqid);
7451 if (data->cancelled && data->rpc_status == 0) {
7452 struct rpc_task *task;
7453 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7454 data->arg.lock_seqid);
7455 if (!IS_ERR(task))
7456 rpc_put_task_async(task);
7457 dprintk("%s: cancelling lock!\n", __func__);
7458 } else
7459 nfs_free_seqid(data->arg.lock_seqid);
7460 nfs4_put_lock_state(data->lsp);
7461 put_nfs_open_context(data->ctx);
7462 kfree(data);
7463 }
7464
7465 static const struct rpc_call_ops nfs4_lock_ops = {
7466 .rpc_call_prepare = nfs4_lock_prepare,
7467 .rpc_call_done = nfs4_lock_done,
7468 .rpc_release = nfs4_lock_release,
7469 };
7470
nfs4_handle_setlk_error(struct nfs_server * server,struct nfs4_lock_state * lsp,int new_lock_owner,int error)7471 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7472 {
7473 switch (error) {
7474 case -NFS4ERR_ADMIN_REVOKED:
7475 case -NFS4ERR_EXPIRED:
7476 case -NFS4ERR_BAD_STATEID:
7477 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7478 if (new_lock_owner != 0 ||
7479 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7480 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7481 break;
7482 case -NFS4ERR_STALE_STATEID:
7483 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7484 nfs4_schedule_lease_recovery(server->nfs_client);
7485 }
7486 }
7487
_nfs4_do_setlk(struct nfs4_state * state,int cmd,struct file_lock * fl,int recovery_type)7488 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7489 {
7490 struct nfs4_lockdata *data;
7491 struct rpc_task *task;
7492 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
7493 struct rpc_message msg = {
7494 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7495 .rpc_cred = state->owner->so_cred,
7496 };
7497 struct rpc_task_setup task_setup_data = {
7498 .rpc_client = NFS_CLIENT(state->inode),
7499 .rpc_message = &msg,
7500 .callback_ops = &nfs4_lock_ops,
7501 .workqueue = nfsiod_workqueue,
7502 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7503 };
7504 int ret;
7505
7506 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7507 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7508
7509 data = nfs4_alloc_lockdata(fl,
7510 nfs_file_open_context(fl->c.flc_file),
7511 fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7512 if (data == NULL)
7513 return -ENOMEM;
7514 if (IS_SETLKW(cmd))
7515 data->arg.block = 1;
7516 nfs4_init_sequence(clp, &data->arg.seq_args, &data->res.seq_res, 1,
7517 recovery_type > NFS_LOCK_NEW);
7518 msg.rpc_argp = &data->arg;
7519 msg.rpc_resp = &data->res;
7520 task_setup_data.callback_data = data;
7521
7522 if (recovery_type == NFS_LOCK_RECLAIM)
7523 data->arg.reclaim = NFS_LOCK_RECLAIM;
7524
7525 task = rpc_run_task(&task_setup_data);
7526 if (IS_ERR(task))
7527 return PTR_ERR(task);
7528 ret = rpc_wait_for_completion_task(task);
7529 if (ret == 0) {
7530 ret = data->rpc_status;
7531 if (ret)
7532 nfs4_handle_setlk_error(data->server, data->lsp,
7533 data->arg.new_lock_owner, ret);
7534 } else
7535 data->cancelled = true;
7536 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7537 rpc_put_task(task);
7538 dprintk("%s: ret = %d\n", __func__, ret);
7539 return ret;
7540 }
7541
nfs4_lock_reclaim(struct nfs4_state * state,struct file_lock * request)7542 int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7543 {
7544 struct nfs_server *server = NFS_SERVER(state->inode);
7545 struct nfs4_exception exception = {
7546 .inode = state->inode,
7547 };
7548 int err;
7549
7550 do {
7551 /* Cache the lock if possible... */
7552 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7553 return 0;
7554 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7555 if (err != -NFS4ERR_DELAY)
7556 break;
7557 nfs4_handle_exception(server, err, &exception);
7558 } while (exception.retry);
7559 return err;
7560 }
7561
nfs4_lock_expired(struct nfs4_state * state,struct file_lock * request)7562 int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7563 {
7564 struct nfs_server *server = NFS_SERVER(state->inode);
7565 struct nfs4_exception exception = {
7566 .inode = state->inode,
7567 };
7568 int err;
7569
7570 err = nfs4_set_lock_state(state, request);
7571 if (err != 0)
7572 return err;
7573 if (!recover_lost_locks) {
7574 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7575 return 0;
7576 }
7577 do {
7578 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7579 return 0;
7580 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7581 switch (err) {
7582 default:
7583 goto out;
7584 case -NFS4ERR_GRACE:
7585 case -NFS4ERR_DELAY:
7586 nfs4_handle_exception(server, err, &exception);
7587 err = 0;
7588 }
7589 } while (exception.retry);
7590 out:
7591 return err;
7592 }
7593
nfs41_lock_expired(struct nfs4_state * state,struct file_lock * request)7594 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7595 {
7596 struct nfs4_lock_state *lsp;
7597 int status;
7598
7599 status = nfs4_set_lock_state(state, request);
7600 if (status != 0)
7601 return status;
7602 lsp = request->fl_u.nfs4_fl.owner;
7603 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7604 test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7605 return 0;
7606 return nfs4_lock_expired(state, request);
7607 }
7608
_nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7609 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7610 {
7611 struct nfs_inode *nfsi = NFS_I(state->inode);
7612 struct nfs4_state_owner *sp = state->owner;
7613 unsigned char flags = request->c.flc_flags;
7614 int status;
7615
7616 request->c.flc_flags |= FL_ACCESS;
7617 status = locks_lock_inode_wait(state->inode, request);
7618 if (status < 0)
7619 goto out;
7620 mutex_lock(&sp->so_delegreturn_mutex);
7621 down_read(&nfsi->rwsem);
7622 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7623 /* Yes: cache locks! */
7624 /* ...but avoid races with delegation recall... */
7625 request->c.flc_flags = flags & ~FL_SLEEP;
7626 status = locks_lock_inode_wait(state->inode, request);
7627 up_read(&nfsi->rwsem);
7628 mutex_unlock(&sp->so_delegreturn_mutex);
7629 goto out;
7630 }
7631 up_read(&nfsi->rwsem);
7632 mutex_unlock(&sp->so_delegreturn_mutex);
7633 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7634 if (status)
7635 goto out;
7636
7637 down_read(&nfsi->rwsem);
7638 request->c.flc_flags &= ~(FL_SLEEP | FL_ACCESS);
7639 status = locks_lock_inode_wait(state->inode, request);
7640 up_read(&nfsi->rwsem);
7641 out:
7642 request->c.flc_flags = flags;
7643 return status;
7644 }
7645
nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7646 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7647 {
7648 struct nfs4_exception exception = {
7649 .state = state,
7650 .inode = state->inode,
7651 .interruptible = true,
7652 };
7653 int err;
7654
7655 do {
7656 err = _nfs4_proc_setlk(state, cmd, request);
7657 if (err == -NFS4ERR_DENIED)
7658 err = -EAGAIN;
7659 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7660 err, &exception);
7661 } while (exception.retry);
7662 return err;
7663 }
7664
7665 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7666 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7667
7668 static int
nfs4_retry_setlk_simple(struct nfs4_state * state,int cmd,struct file_lock * request)7669 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7670 struct file_lock *request)
7671 {
7672 int status = -ERESTARTSYS;
7673 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
7674
7675 while(!signalled()) {
7676 status = nfs4_proc_setlk(state, cmd, request);
7677 if ((status != -EAGAIN) || IS_SETLK(cmd))
7678 break;
7679 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7680 schedule_timeout(timeout);
7681 timeout *= 2;
7682 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7683 status = -ERESTARTSYS;
7684 }
7685 return status;
7686 }
7687
7688 struct nfs4_lock_waiter {
7689 struct inode *inode;
7690 struct nfs_lowner owner;
7691 wait_queue_entry_t wait;
7692 };
7693
7694 static int
nfs4_wake_lock_waiter(wait_queue_entry_t * wait,unsigned int mode,int flags,void * key)7695 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7696 {
7697 struct nfs4_lock_waiter *waiter =
7698 container_of(wait, struct nfs4_lock_waiter, wait);
7699
7700 /* NULL key means to wake up everyone */
7701 if (key) {
7702 struct cb_notify_lock_args *cbnl = key;
7703 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
7704 *wowner = &waiter->owner;
7705
7706 /* Only wake if the callback was for the same owner. */
7707 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7708 return 0;
7709
7710 /* Make sure it's for the right inode */
7711 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7712 return 0;
7713 }
7714
7715 return woken_wake_function(wait, mode, flags, key);
7716 }
7717
7718 static int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7719 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7720 {
7721 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7722 struct nfs_server *server = NFS_SERVER(state->inode);
7723 struct nfs_client *clp = server->nfs_client;
7724 wait_queue_head_t *q = &clp->cl_lock_waitq;
7725 struct nfs4_lock_waiter waiter = {
7726 .inode = state->inode,
7727 .owner = { .clientid = clp->cl_clientid,
7728 .id = lsp->ls_seqid.owner_id,
7729 .s_dev = server->s_dev },
7730 };
7731 int status;
7732
7733 /* Don't bother with waitqueue if we don't expect a callback */
7734 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7735 return nfs4_retry_setlk_simple(state, cmd, request);
7736
7737 init_wait(&waiter.wait);
7738 waiter.wait.func = nfs4_wake_lock_waiter;
7739 add_wait_queue(q, &waiter.wait);
7740
7741 do {
7742 status = nfs4_proc_setlk(state, cmd, request);
7743 if (status != -EAGAIN || IS_SETLK(cmd))
7744 break;
7745
7746 status = -ERESTARTSYS;
7747 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7748 NFS4_LOCK_MAXTIMEOUT);
7749 } while (!signalled());
7750
7751 remove_wait_queue(q, &waiter.wait);
7752
7753 return status;
7754 }
7755
7756 static int
nfs4_proc_lock(struct file * filp,int cmd,struct file_lock * request)7757 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7758 {
7759 struct nfs_open_context *ctx;
7760 struct nfs4_state *state;
7761 int status;
7762
7763 /* verify open state */
7764 ctx = nfs_file_open_context(filp);
7765 state = ctx->state;
7766
7767 if (IS_GETLK(cmd)) {
7768 if (state != NULL)
7769 return nfs4_proc_getlk(state, F_GETLK, request);
7770 return 0;
7771 }
7772
7773 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7774 return -EINVAL;
7775
7776 if (lock_is_unlock(request)) {
7777 if (state != NULL)
7778 return nfs4_proc_unlck(state, cmd, request);
7779 return 0;
7780 }
7781
7782 if (state == NULL)
7783 return -ENOLCK;
7784
7785 if ((request->c.flc_flags & FL_POSIX) &&
7786 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7787 return -ENOLCK;
7788
7789 /*
7790 * Don't rely on the VFS having checked the file open mode,
7791 * since it won't do this for flock() locks.
7792 */
7793 switch (request->c.flc_type) {
7794 case F_RDLCK:
7795 if (!(filp->f_mode & FMODE_READ))
7796 return -EBADF;
7797 break;
7798 case F_WRLCK:
7799 if (!(filp->f_mode & FMODE_WRITE))
7800 return -EBADF;
7801 }
7802
7803 status = nfs4_set_lock_state(state, request);
7804 if (status != 0)
7805 return status;
7806
7807 return nfs4_retry_setlk(state, cmd, request);
7808 }
7809
nfs4_delete_lease(struct file * file,void ** priv)7810 static int nfs4_delete_lease(struct file *file, void **priv)
7811 {
7812 return generic_setlease(file, F_UNLCK, NULL, priv);
7813 }
7814
nfs4_add_lease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7815 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease,
7816 void **priv)
7817 {
7818 struct inode *inode = file_inode(file);
7819 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7820 fl_owner_t owner = (*lease)->c.flc_owner;
7821 int ret;
7822
7823 /* No delegation, no lease */
7824 if (!nfs4_have_delegation(inode, type, 0))
7825 return -EAGAIN;
7826 ret = generic_setlease(file, arg, lease, priv);
7827 if (ret || nfs4_have_delegation(inode, type, 0))
7828 return ret;
7829 /* We raced with a delegation return */
7830 dprintk("%s: raced with a delegation return\n", __func__);
7831 nfs4_delete_lease(file, &owner);
7832 return -EAGAIN;
7833 }
7834
nfs4_proc_setlease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7835 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease,
7836 void **priv)
7837 {
7838 switch (arg) {
7839 case F_RDLCK:
7840 case F_WRLCK:
7841 return nfs4_add_lease(file, arg, lease, priv);
7842 case F_UNLCK:
7843 return nfs4_delete_lease(file, priv);
7844 default:
7845 return -EINVAL;
7846 }
7847 }
7848
nfs4_lock_delegation_recall(struct file_lock * fl,struct nfs4_state * state,const nfs4_stateid * stateid)7849 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7850 {
7851 struct nfs_server *server = NFS_SERVER(state->inode);
7852 int err;
7853
7854 err = nfs4_set_lock_state(state, fl);
7855 if (err != 0)
7856 return err;
7857 do {
7858 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7859 if (err != -NFS4ERR_DELAY && err != -NFS4ERR_GRACE)
7860 break;
7861 ssleep(1);
7862 } while (err == -NFS4ERR_DELAY || err == -NFSERR_GRACE);
7863 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7864 }
7865
7866 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7867
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)7868 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7869 struct mnt_idmap *idmap,
7870 struct dentry *unused, struct inode *inode,
7871 const char *key, const void *buf,
7872 size_t buflen, int flags)
7873 {
7874 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7875 }
7876
nfs4_xattr_get_nfs4_acl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7877 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7878 struct dentry *unused, struct inode *inode,
7879 const char *key, void *buf, size_t buflen)
7880 {
7881 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7882 }
7883
nfs4_xattr_list_nfs4_acl(struct dentry * dentry)7884 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7885 {
7886 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7887 }
7888
7889 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7890
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)7891 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7892 struct mnt_idmap *idmap,
7893 struct dentry *unused, struct inode *inode,
7894 const char *key, const void *buf,
7895 size_t buflen, int flags)
7896 {
7897 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7898 }
7899
nfs4_xattr_get_nfs4_dacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7900 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7901 struct dentry *unused, struct inode *inode,
7902 const char *key, void *buf, size_t buflen)
7903 {
7904 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7905 }
7906
nfs4_xattr_list_nfs4_dacl(struct dentry * dentry)7907 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7908 {
7909 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7910 }
7911
7912 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7913
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)7914 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7915 struct mnt_idmap *idmap,
7916 struct dentry *unused, struct inode *inode,
7917 const char *key, const void *buf,
7918 size_t buflen, int flags)
7919 {
7920 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7921 }
7922
nfs4_xattr_get_nfs4_sacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7923 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7924 struct dentry *unused, struct inode *inode,
7925 const char *key, void *buf, size_t buflen)
7926 {
7927 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7928 }
7929
nfs4_xattr_list_nfs4_sacl(struct dentry * dentry)7930 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7931 {
7932 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7933 }
7934
7935 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7936
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)7937 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7938 struct mnt_idmap *idmap,
7939 struct dentry *unused, struct inode *inode,
7940 const char *key, const void *buf,
7941 size_t buflen, int flags)
7942 {
7943 if (security_ismaclabel(key))
7944 return nfs4_set_security_label(inode, buf, buflen);
7945
7946 return -EOPNOTSUPP;
7947 }
7948
nfs4_xattr_get_nfs4_label(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_label(const struct xattr_handler *handler,
7950 struct dentry *unused, struct inode *inode,
7951 const char *key, void *buf, size_t buflen)
7952 {
7953 if (security_ismaclabel(key))
7954 return nfs4_get_security_label(inode, buf, buflen);
7955 return -EOPNOTSUPP;
7956 }
7957
7958 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7959 .prefix = XATTR_SECURITY_PREFIX,
7960 .get = nfs4_xattr_get_nfs4_label,
7961 .set = nfs4_xattr_set_nfs4_label,
7962 };
7963
7964 #endif
7965
7966 #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)7967 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7968 struct mnt_idmap *idmap,
7969 struct dentry *unused, struct inode *inode,
7970 const char *key, const void *buf,
7971 size_t buflen, int flags)
7972 {
7973 u32 mask;
7974 int ret;
7975
7976 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7977 return -EOPNOTSUPP;
7978
7979 /*
7980 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7981 * flags right now. Handling of xattr operations use the normal
7982 * file read/write permissions.
7983 *
7984 * Just in case the server has other ideas (which RFC 8276 allows),
7985 * do a cached access check for the XA* flags to possibly avoid
7986 * doing an RPC and getting EACCES back.
7987 */
7988 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7989 if (!(mask & NFS_ACCESS_XAWRITE))
7990 return -EACCES;
7991 }
7992
7993 if (buf == NULL) {
7994 ret = nfs42_proc_removexattr(inode, key);
7995 if (!ret)
7996 nfs4_xattr_cache_remove(inode, key);
7997 } else {
7998 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7999 if (!ret)
8000 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
8001 }
8002
8003 return ret;
8004 }
8005
nfs4_xattr_get_nfs4_user(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)8006 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
8007 struct dentry *unused, struct inode *inode,
8008 const char *key, void *buf, size_t buflen)
8009 {
8010 u32 mask;
8011 ssize_t ret;
8012
8013 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8014 return -EOPNOTSUPP;
8015
8016 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8017 if (!(mask & NFS_ACCESS_XAREAD))
8018 return -EACCES;
8019 }
8020
8021 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8022 if (ret)
8023 return ret;
8024
8025 ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
8026 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8027 return ret;
8028
8029 ret = nfs42_proc_getxattr(inode, key, buf, buflen);
8030
8031 return ret;
8032 }
8033
8034 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8035 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8036 {
8037 u64 cookie;
8038 bool eof;
8039 ssize_t ret, size;
8040 char *buf;
8041 size_t buflen;
8042 u32 mask;
8043
8044 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8045 return 0;
8046
8047 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8048 if (!(mask & NFS_ACCESS_XALIST))
8049 return 0;
8050 }
8051
8052 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8053 if (ret)
8054 return ret;
8055
8056 ret = nfs4_xattr_cache_list(inode, list, list_len);
8057 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8058 return ret;
8059
8060 cookie = 0;
8061 eof = false;
8062 buflen = list_len ? list_len : XATTR_LIST_MAX;
8063 buf = list_len ? list : NULL;
8064 size = 0;
8065
8066 while (!eof) {
8067 ret = nfs42_proc_listxattrs(inode, buf, buflen,
8068 &cookie, &eof);
8069 if (ret < 0)
8070 return ret;
8071
8072 if (list_len) {
8073 buf += ret;
8074 buflen -= ret;
8075 }
8076 size += ret;
8077 }
8078
8079 if (list_len)
8080 nfs4_xattr_cache_set_list(inode, list, size);
8081
8082 return size;
8083 }
8084
8085 #else
8086
8087 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8088 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8089 {
8090 return 0;
8091 }
8092 #endif /* CONFIG_NFS_V4_2 */
8093
8094 /*
8095 * nfs_fhget will use either the mounted_on_fileid or the fileid
8096 */
nfs_fixup_referral_attributes(struct nfs_fattr * fattr)8097 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
8098 {
8099 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
8100 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
8101 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
8102 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
8103 return;
8104
8105 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
8106 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
8107 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
8108 fattr->nlink = 2;
8109 }
8110
_nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8111 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8112 const struct qstr *name,
8113 struct nfs4_fs_locations *fs_locations,
8114 struct page *page)
8115 {
8116 struct nfs_server *server = NFS_SERVER(dir);
8117 u32 bitmask[3];
8118 struct nfs4_fs_locations_arg args = {
8119 .dir_fh = NFS_FH(dir),
8120 .name = name,
8121 .page = page,
8122 .bitmask = bitmask,
8123 };
8124 struct nfs4_fs_locations_res res = {
8125 .fs_locations = fs_locations,
8126 };
8127 struct rpc_message msg = {
8128 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8129 .rpc_argp = &args,
8130 .rpc_resp = &res,
8131 };
8132 int status;
8133
8134 dprintk("%s: start\n", __func__);
8135
8136 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8137 bitmask[1] = nfs4_fattr_bitmap[1];
8138
8139 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8140 * is not supported */
8141 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8142 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8143 else
8144 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8145
8146 nfs_fattr_init(fs_locations->fattr);
8147 fs_locations->server = server;
8148 fs_locations->nlocations = 0;
8149 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8150 dprintk("%s: returned status = %d\n", __func__, status);
8151 return status;
8152 }
8153
nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8154 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8155 const struct qstr *name,
8156 struct nfs4_fs_locations *fs_locations,
8157 struct page *page)
8158 {
8159 struct nfs4_exception exception = {
8160 .interruptible = true,
8161 };
8162 int err;
8163 do {
8164 err = _nfs4_proc_fs_locations(client, dir, name,
8165 fs_locations, page);
8166 trace_nfs4_get_fs_locations(dir, name, err);
8167 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8168 &exception);
8169 } while (exception.retry);
8170 return err;
8171 }
8172
8173 /*
8174 * This operation also signals the server that this client is
8175 * performing migration recovery. The server can stop asserting
8176 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
8177 * performing this operation is identified in the SEQUENCE
8178 * operation in this compound.
8179 *
8180 * When the client supports GETATTR(fs_locations_info), it can
8181 * be plumbed in here.
8182 */
_nfs41_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8183 static int _nfs41_proc_get_locations(struct nfs_server *server,
8184 struct nfs_fh *fhandle,
8185 struct nfs4_fs_locations *locations,
8186 struct page *page, const struct cred *cred)
8187 {
8188 struct rpc_clnt *clnt = server->client;
8189 struct nfs_client *clp = server->nfs_client;
8190 u32 bitmask[2] = {
8191 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8192 };
8193 struct nfs4_fs_locations_arg args = {
8194 .fh = fhandle,
8195 .page = page,
8196 .bitmask = bitmask,
8197 .migration = 1, /* skip LOOKUP */
8198 };
8199 struct nfs4_fs_locations_res res = {
8200 .fs_locations = locations,
8201 .migration = 1,
8202 };
8203 struct rpc_message msg = {
8204 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8205 .rpc_argp = &args,
8206 .rpc_resp = &res,
8207 .rpc_cred = cred,
8208 };
8209 struct nfs4_call_sync_data data = {
8210 .seq_server = server,
8211 .seq_args = &args.seq_args,
8212 .seq_res = &res.seq_res,
8213 };
8214 struct rpc_task_setup task_setup_data = {
8215 .rpc_client = clnt,
8216 .rpc_message = &msg,
8217 .callback_ops = clp->cl_mvops->call_sync_ops,
8218 .callback_data = &data,
8219 .flags = RPC_TASK_NO_ROUND_ROBIN,
8220 };
8221 int status;
8222
8223 nfs_fattr_init(locations->fattr);
8224 locations->server = server;
8225 locations->nlocations = 0;
8226
8227 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 1);
8228 status = nfs4_call_sync_custom(&task_setup_data);
8229 if (status == NFS4_OK &&
8230 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8231 status = -NFS4ERR_LEASE_MOVED;
8232 return status;
8233 }
8234
8235 /**
8236 * nfs4_proc_get_locations - discover locations for a migrated FSID
8237 * @server: pointer to nfs_server to process
8238 * @fhandle: pointer to the kernel NFS client file handle
8239 * @locations: result of query
8240 * @page: buffer
8241 * @cred: credential to use for this operation
8242 *
8243 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8244 * operation failed, or a negative errno if a local error occurred.
8245 *
8246 * On success, "locations" is filled in, but if the server has
8247 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8248 * asserted.
8249 *
8250 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8251 * from this client that require migration recovery.
8252 */
nfs4_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8253 int nfs4_proc_get_locations(struct nfs_server *server,
8254 struct nfs_fh *fhandle,
8255 struct nfs4_fs_locations *locations,
8256 struct page *page, const struct cred *cred)
8257 {
8258 struct nfs_client *clp = server->nfs_client;
8259 const struct nfs4_mig_recovery_ops *ops =
8260 clp->cl_mvops->mig_recovery_ops;
8261 struct nfs4_exception exception = {
8262 .interruptible = true,
8263 };
8264 int status;
8265
8266 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8267 (unsigned long long)server->fsid.major,
8268 (unsigned long long)server->fsid.minor,
8269 clp->cl_hostname);
8270 nfs_display_fhandle(fhandle, __func__);
8271
8272 do {
8273 status = ops->get_locations(server, fhandle, locations, page,
8274 cred);
8275 if (status != -NFS4ERR_DELAY)
8276 break;
8277 nfs4_handle_exception(server, status, &exception);
8278 } while (exception.retry);
8279 return status;
8280 }
8281
8282 /*
8283 * This operation also signals the server that this client is
8284 * performing "lease moved" recovery. The server can stop asserting
8285 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
8286 * this operation is identified in the SEQUENCE operation in this
8287 * compound.
8288 */
_nfs41_proc_fsid_present(struct inode * inode,const struct cred * cred)8289 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8290 {
8291 struct nfs_server *server = NFS_SERVER(inode);
8292 struct rpc_clnt *clnt = server->client;
8293 struct nfs4_fsid_present_arg args = {
8294 .fh = NFS_FH(inode),
8295 };
8296 struct nfs4_fsid_present_res res = {
8297 };
8298 struct rpc_message msg = {
8299 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8300 .rpc_argp = &args,
8301 .rpc_resp = &res,
8302 .rpc_cred = cred,
8303 };
8304 int status;
8305
8306 res.fh = nfs_alloc_fhandle();
8307 if (res.fh == NULL)
8308 return -ENOMEM;
8309
8310 nfs4_init_sequence(server->nfs_client, &args.seq_args, &res.seq_res, 0, 1);
8311 status = nfs4_call_sync_sequence(clnt, server, &msg,
8312 &args.seq_args, &res.seq_res);
8313 nfs_free_fhandle(res.fh);
8314 if (status == NFS4_OK &&
8315 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8316 status = -NFS4ERR_LEASE_MOVED;
8317 return status;
8318 }
8319
8320 /**
8321 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8322 * @inode: inode on FSID to check
8323 * @cred: credential to use for this operation
8324 *
8325 * Server indicates whether the FSID is present, moved, or not
8326 * recognized. This operation is necessary to clear a LEASE_MOVED
8327 * condition for this client ID.
8328 *
8329 * Returns NFS4_OK if the FSID is present on this server,
8330 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8331 * NFS4ERR code if some error occurred on the server, or a
8332 * negative errno if a local failure occurred.
8333 */
nfs4_proc_fsid_present(struct inode * inode,const struct cred * cred)8334 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8335 {
8336 struct nfs_server *server = NFS_SERVER(inode);
8337 struct nfs_client *clp = server->nfs_client;
8338 const struct nfs4_mig_recovery_ops *ops =
8339 clp->cl_mvops->mig_recovery_ops;
8340 struct nfs4_exception exception = {
8341 .interruptible = true,
8342 };
8343 int status;
8344
8345 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8346 (unsigned long long)server->fsid.major,
8347 (unsigned long long)server->fsid.minor,
8348 clp->cl_hostname);
8349 nfs_display_fhandle(NFS_FH(inode), __func__);
8350
8351 do {
8352 status = ops->fsid_present(inode, cred);
8353 if (status != -NFS4ERR_DELAY)
8354 break;
8355 nfs4_handle_exception(server, status, &exception);
8356 } while (exception.retry);
8357 return status;
8358 }
8359
8360 /*
8361 * If 'use_integrity' is true and the state managment nfs_client
8362 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8363 * and the machine credential as per RFC3530bis and RFC5661 Security
8364 * Considerations sections. Otherwise, just use the user cred with the
8365 * filesystem's rpc_client.
8366 */
_nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors,bool use_integrity)8367 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8368 {
8369 int status;
8370 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8371 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8372 struct nfs4_secinfo_arg args = {
8373 .dir_fh = NFS_FH(dir),
8374 .name = name,
8375 };
8376 struct nfs4_secinfo_res res = {
8377 .flavors = flavors,
8378 };
8379 struct rpc_message msg = {
8380 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8381 .rpc_argp = &args,
8382 .rpc_resp = &res,
8383 };
8384 struct nfs4_call_sync_data data = {
8385 .seq_server = NFS_SERVER(dir),
8386 .seq_args = &args.seq_args,
8387 .seq_res = &res.seq_res,
8388 };
8389 struct rpc_task_setup task_setup = {
8390 .rpc_client = clnt,
8391 .rpc_message = &msg,
8392 .callback_ops = clp->cl_mvops->call_sync_ops,
8393 .callback_data = &data,
8394 .flags = RPC_TASK_NO_ROUND_ROBIN,
8395 };
8396 const struct cred *cred = NULL;
8397
8398 if (use_integrity) {
8399 clnt = clp->cl_rpcclient;
8400 task_setup.rpc_client = clnt;
8401
8402 cred = nfs4_get_clid_cred(clp);
8403 msg.rpc_cred = cred;
8404 }
8405
8406 dprintk("NFS call secinfo %s\n", name->name);
8407
8408 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8409 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 0);
8410 status = nfs4_call_sync_custom(&task_setup);
8411
8412 dprintk("NFS reply secinfo: %d\n", status);
8413
8414 put_cred(cred);
8415 return status;
8416 }
8417
nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors)8418 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8419 struct nfs4_secinfo_flavors *flavors)
8420 {
8421 struct nfs4_exception exception = {
8422 .interruptible = true,
8423 };
8424 int err;
8425 do {
8426 err = -NFS4ERR_WRONGSEC;
8427
8428 /* try to use integrity protection with machine cred */
8429 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8430 err = _nfs4_proc_secinfo(dir, name, flavors, true);
8431
8432 /*
8433 * if unable to use integrity protection, or SECINFO with
8434 * integrity protection returns NFS4ERR_WRONGSEC (which is
8435 * disallowed by spec, but exists in deployed servers) use
8436 * the current filesystem's rpc_client and the user cred.
8437 */
8438 if (err == -NFS4ERR_WRONGSEC)
8439 err = _nfs4_proc_secinfo(dir, name, flavors, false);
8440
8441 trace_nfs4_secinfo(dir, name, err);
8442 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8443 &exception);
8444 } while (exception.retry);
8445 return err;
8446 }
8447
8448 /*
8449 * Check the exchange flags returned by the server for invalid flags, having
8450 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8451 * DS flags set.
8452 */
nfs4_check_cl_exchange_flags(u32 flags,u32 version)8453 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8454 {
8455 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8456 goto out_inval;
8457 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8458 goto out_inval;
8459 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8460 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8461 goto out_inval;
8462 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8463 goto out_inval;
8464 return NFS_OK;
8465 out_inval:
8466 return -NFS4ERR_INVAL;
8467 }
8468
8469 static bool
nfs41_same_server_scope(struct nfs41_server_scope * a,struct nfs41_server_scope * b)8470 nfs41_same_server_scope(struct nfs41_server_scope *a,
8471 struct nfs41_server_scope *b)
8472 {
8473 if (a->server_scope_sz != b->server_scope_sz)
8474 return false;
8475 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8476 }
8477
8478 static void
nfs4_bind_one_conn_to_session_done(struct rpc_task * task,void * calldata)8479 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8480 {
8481 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8482 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8483 struct nfs_client *clp = args->client;
8484
8485 switch (task->tk_status) {
8486 case -NFS4ERR_BADSESSION:
8487 case -NFS4ERR_DEADSESSION:
8488 nfs4_schedule_session_recovery(clp->cl_session,
8489 task->tk_status);
8490 return;
8491 }
8492 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8493 res->dir != NFS4_CDFS4_BOTH) {
8494 rpc_task_close_connection(task);
8495 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8496 rpc_restart_call(task);
8497 }
8498 }
8499
8500 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8501 .rpc_call_done = nfs4_bind_one_conn_to_session_done,
8502 };
8503
8504 /*
8505 * nfs4_proc_bind_one_conn_to_session()
8506 *
8507 * The 4.1 client currently uses the same TCP connection for the
8508 * fore and backchannel.
8509 */
8510 static
nfs4_proc_bind_one_conn_to_session(struct rpc_clnt * clnt,struct rpc_xprt * xprt,struct nfs_client * clp,const struct cred * cred)8511 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8512 struct rpc_xprt *xprt,
8513 struct nfs_client *clp,
8514 const struct cred *cred)
8515 {
8516 int status;
8517 struct nfs41_bind_conn_to_session_args args = {
8518 .client = clp,
8519 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8520 .retries = 0,
8521 };
8522 struct nfs41_bind_conn_to_session_res res;
8523 struct rpc_message msg = {
8524 .rpc_proc =
8525 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8526 .rpc_argp = &args,
8527 .rpc_resp = &res,
8528 .rpc_cred = cred,
8529 };
8530 struct rpc_task_setup task_setup_data = {
8531 .rpc_client = clnt,
8532 .rpc_xprt = xprt,
8533 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8534 .rpc_message = &msg,
8535 .flags = RPC_TASK_TIMEOUT,
8536 };
8537 struct rpc_task *task;
8538
8539 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8540 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8541 args.dir = NFS4_CDFC4_FORE;
8542
8543 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8544 if (xprt != rcu_access_pointer(clnt->cl_xprt))
8545 args.dir = NFS4_CDFC4_FORE;
8546
8547 task = rpc_run_task(&task_setup_data);
8548 if (!IS_ERR(task)) {
8549 status = task->tk_status;
8550 rpc_put_task(task);
8551 } else
8552 status = PTR_ERR(task);
8553 trace_nfs4_bind_conn_to_session(clp, status);
8554 if (status == 0) {
8555 if (memcmp(res.sessionid.data,
8556 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8557 dprintk("NFS: %s: Session ID mismatch\n", __func__);
8558 return -EIO;
8559 }
8560 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8561 dprintk("NFS: %s: Unexpected direction from server\n",
8562 __func__);
8563 return -EIO;
8564 }
8565 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8566 dprintk("NFS: %s: Server returned RDMA mode = true\n",
8567 __func__);
8568 return -EIO;
8569 }
8570 }
8571
8572 return status;
8573 }
8574
8575 struct rpc_bind_conn_calldata {
8576 struct nfs_client *clp;
8577 const struct cred *cred;
8578 };
8579
8580 static int
nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * calldata)8581 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8582 struct rpc_xprt *xprt,
8583 void *calldata)
8584 {
8585 struct rpc_bind_conn_calldata *p = calldata;
8586
8587 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8588 }
8589
nfs4_proc_bind_conn_to_session(struct nfs_client * clp,const struct cred * cred)8590 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8591 {
8592 struct rpc_bind_conn_calldata data = {
8593 .clp = clp,
8594 .cred = cred,
8595 };
8596 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8597 nfs4_proc_bind_conn_to_session_callback, &data);
8598 }
8599
8600 /*
8601 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8602 * and operations we'd like to see to enable certain features in the allow map
8603 */
8604 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8605 .how = SP4_MACH_CRED,
8606 .enforce.u.words = {
8607 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8608 1 << (OP_EXCHANGE_ID - 32) |
8609 1 << (OP_CREATE_SESSION - 32) |
8610 1 << (OP_DESTROY_SESSION - 32) |
8611 1 << (OP_DESTROY_CLIENTID - 32)
8612 },
8613 .allow.u.words = {
8614 [0] = 1 << (OP_CLOSE) |
8615 1 << (OP_OPEN_DOWNGRADE) |
8616 1 << (OP_LOCKU) |
8617 1 << (OP_DELEGRETURN) |
8618 1 << (OP_COMMIT),
8619 [1] = 1 << (OP_SECINFO - 32) |
8620 1 << (OP_SECINFO_NO_NAME - 32) |
8621 1 << (OP_LAYOUTRETURN - 32) |
8622 1 << (OP_TEST_STATEID - 32) |
8623 1 << (OP_FREE_STATEID - 32) |
8624 1 << (OP_WRITE - 32)
8625 }
8626 };
8627
8628 /*
8629 * Select the state protection mode for client `clp' given the server results
8630 * from exchange_id in `sp'.
8631 *
8632 * Returns 0 on success, negative errno otherwise.
8633 */
nfs4_sp4_select_mode(struct nfs_client * clp,struct nfs41_state_protection * sp)8634 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8635 struct nfs41_state_protection *sp)
8636 {
8637 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8638 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8639 1 << (OP_EXCHANGE_ID - 32) |
8640 1 << (OP_CREATE_SESSION - 32) |
8641 1 << (OP_DESTROY_SESSION - 32) |
8642 1 << (OP_DESTROY_CLIENTID - 32)
8643 };
8644 unsigned long flags = 0;
8645 unsigned int i;
8646 int ret = 0;
8647
8648 if (sp->how == SP4_MACH_CRED) {
8649 /* Print state protect result */
8650 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8651 for (i = 0; i <= LAST_NFS4_OP; i++) {
8652 if (test_bit(i, sp->enforce.u.longs))
8653 dfprintk(MOUNT, " enforce op %d\n", i);
8654 if (test_bit(i, sp->allow.u.longs))
8655 dfprintk(MOUNT, " allow op %d\n", i);
8656 }
8657
8658 /* make sure nothing is on enforce list that isn't supported */
8659 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8660 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8661 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8662 ret = -EINVAL;
8663 goto out;
8664 }
8665 }
8666
8667 /*
8668 * Minimal mode - state operations are allowed to use machine
8669 * credential. Note this already happens by default, so the
8670 * client doesn't have to do anything more than the negotiation.
8671 *
8672 * NOTE: we don't care if EXCHANGE_ID is in the list -
8673 * we're already using the machine cred for exchange_id
8674 * and will never use a different cred.
8675 */
8676 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8677 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8678 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8679 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8680 dfprintk(MOUNT, "sp4_mach_cred:\n");
8681 dfprintk(MOUNT, " minimal mode enabled\n");
8682 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8683 } else {
8684 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8685 ret = -EINVAL;
8686 goto out;
8687 }
8688
8689 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8690 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8691 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8692 test_bit(OP_LOCKU, sp->allow.u.longs)) {
8693 dfprintk(MOUNT, " cleanup mode enabled\n");
8694 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8695 }
8696
8697 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8698 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
8699 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8700 }
8701
8702 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8703 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8704 dfprintk(MOUNT, " secinfo mode enabled\n");
8705 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8706 }
8707
8708 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8709 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8710 dfprintk(MOUNT, " stateid mode enabled\n");
8711 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8712 }
8713
8714 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8715 dfprintk(MOUNT, " write mode enabled\n");
8716 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8717 }
8718
8719 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8720 dfprintk(MOUNT, " commit mode enabled\n");
8721 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8722 }
8723 }
8724 out:
8725 clp->cl_sp4_flags = flags;
8726 return ret;
8727 }
8728
8729 struct nfs41_exchange_id_data {
8730 struct nfs41_exchange_id_res res;
8731 struct nfs41_exchange_id_args args;
8732 };
8733
nfs4_exchange_id_release(void * data)8734 static void nfs4_exchange_id_release(void *data)
8735 {
8736 struct nfs41_exchange_id_data *cdata =
8737 (struct nfs41_exchange_id_data *)data;
8738
8739 nfs_put_client(cdata->args.client);
8740 kfree(cdata->res.impl_id);
8741 kfree(cdata->res.server_scope);
8742 kfree(cdata->res.server_owner);
8743 kfree(cdata);
8744 }
8745
8746 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8747 .rpc_release = nfs4_exchange_id_release,
8748 };
8749
8750 /*
8751 * _nfs4_proc_exchange_id()
8752 *
8753 * Wrapper for EXCHANGE_ID operation.
8754 */
8755 static struct rpc_task *
nfs4_run_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how,struct rpc_xprt * xprt)8756 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8757 u32 sp4_how, struct rpc_xprt *xprt)
8758 {
8759 struct rpc_message msg = {
8760 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8761 .rpc_cred = cred,
8762 };
8763 struct rpc_task_setup task_setup_data = {
8764 .rpc_client = clp->cl_rpcclient,
8765 .callback_ops = &nfs4_exchange_id_call_ops,
8766 .rpc_message = &msg,
8767 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8768 };
8769 struct nfs41_exchange_id_data *calldata;
8770 int status;
8771
8772 if (!refcount_inc_not_zero(&clp->cl_count))
8773 return ERR_PTR(-EIO);
8774
8775 status = -ENOMEM;
8776 calldata = kzalloc_obj(*calldata, GFP_NOFS);
8777 if (!calldata)
8778 goto out;
8779
8780 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8781
8782 status = nfs4_init_uniform_client_string(clp);
8783 if (status)
8784 goto out_calldata;
8785
8786 calldata->res.server_owner = kzalloc_obj(struct nfs41_server_owner,
8787 GFP_NOFS);
8788 status = -ENOMEM;
8789 if (unlikely(calldata->res.server_owner == NULL))
8790 goto out_calldata;
8791
8792 calldata->res.server_scope = kzalloc_obj(struct nfs41_server_scope,
8793 GFP_NOFS);
8794 if (unlikely(calldata->res.server_scope == NULL))
8795 goto out_server_owner;
8796
8797 calldata->res.impl_id = kzalloc_obj(struct nfs41_impl_id, GFP_NOFS);
8798 if (unlikely(calldata->res.impl_id == NULL))
8799 goto out_server_scope;
8800
8801 switch (sp4_how) {
8802 case SP4_NONE:
8803 calldata->args.state_protect.how = SP4_NONE;
8804 break;
8805
8806 case SP4_MACH_CRED:
8807 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8808 break;
8809
8810 default:
8811 /* unsupported! */
8812 WARN_ON_ONCE(1);
8813 status = -EINVAL;
8814 goto out_impl_id;
8815 }
8816 if (xprt) {
8817 task_setup_data.rpc_xprt = xprt;
8818 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8819 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8820 sizeof(calldata->args.verifier.data));
8821 }
8822 calldata->args.client = clp;
8823 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8824 EXCHGID4_FLAG_BIND_PRINC_STATEID;
8825 #ifdef CONFIG_NFS_V4_1_MIGRATION
8826 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8827 #endif
8828 if (test_bit(NFS_CS_PNFS, &clp->cl_flags))
8829 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8830 msg.rpc_argp = &calldata->args;
8831 msg.rpc_resp = &calldata->res;
8832 task_setup_data.callback_data = calldata;
8833
8834 return rpc_run_task(&task_setup_data);
8835
8836 out_impl_id:
8837 kfree(calldata->res.impl_id);
8838 out_server_scope:
8839 kfree(calldata->res.server_scope);
8840 out_server_owner:
8841 kfree(calldata->res.server_owner);
8842 out_calldata:
8843 kfree(calldata);
8844 out:
8845 nfs_put_client(clp);
8846 return ERR_PTR(status);
8847 }
8848
8849 /*
8850 * _nfs4_proc_exchange_id()
8851 *
8852 * Wrapper for EXCHANGE_ID operation.
8853 */
_nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how)8854 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8855 u32 sp4_how)
8856 {
8857 struct rpc_task *task;
8858 struct nfs41_exchange_id_args *argp;
8859 struct nfs41_exchange_id_res *resp;
8860 unsigned long now = jiffies;
8861 int status;
8862
8863 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8864 if (IS_ERR(task))
8865 return PTR_ERR(task);
8866
8867 argp = task->tk_msg.rpc_argp;
8868 resp = task->tk_msg.rpc_resp;
8869 status = task->tk_status;
8870 if (status != 0)
8871 goto out;
8872
8873 status = nfs4_check_cl_exchange_flags(resp->flags,
8874 clp->cl_mvops->minor_version);
8875 if (status != 0)
8876 goto out;
8877
8878 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8879 if (status != 0)
8880 goto out;
8881
8882 do_renew_lease(clp, now);
8883
8884 clp->cl_clientid = resp->clientid;
8885 clp->cl_exchange_flags = resp->flags;
8886 clp->cl_seqid = resp->seqid;
8887 /* Client ID is not confirmed */
8888 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8889 clear_bit(NFS4_SESSION_ESTABLISHED,
8890 &clp->cl_session->session_state);
8891
8892 if (clp->cl_serverscope != NULL &&
8893 !nfs41_same_server_scope(clp->cl_serverscope,
8894 resp->server_scope)) {
8895 dprintk("%s: server_scope mismatch detected\n",
8896 __func__);
8897 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8898 }
8899
8900 swap(clp->cl_serverowner, resp->server_owner);
8901 swap(clp->cl_serverscope, resp->server_scope);
8902 swap(clp->cl_implid, resp->impl_id);
8903
8904 /* Save the EXCHANGE_ID verifier session trunk tests */
8905 memcpy(clp->cl_confirm.data, argp->verifier.data,
8906 sizeof(clp->cl_confirm.data));
8907 out:
8908 trace_nfs4_exchange_id(clp, status);
8909 rpc_put_task(task);
8910 return status;
8911 }
8912
8913 /*
8914 * nfs4_proc_exchange_id()
8915 *
8916 * Returns zero, a negative errno, or a negative NFS4ERR status code.
8917 *
8918 * Since the clientid has expired, all compounds using sessions
8919 * associated with the stale clientid will be returning
8920 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8921 * be in some phase of session reset.
8922 *
8923 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8924 */
nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred)8925 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8926 {
8927 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8928 int status;
8929
8930 /* try SP4_MACH_CRED if krb5i/p */
8931 if (authflavor == RPC_AUTH_GSS_KRB5I ||
8932 authflavor == RPC_AUTH_GSS_KRB5P) {
8933 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8934 if (!status)
8935 return 0;
8936 }
8937
8938 /* try SP4_NONE */
8939 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8940 }
8941
8942 /**
8943 * nfs4_test_session_trunk
8944 *
8945 * This is an add_xprt_test() test function called from
8946 * rpc_clnt_setup_test_and_add_xprt.
8947 *
8948 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8949 * and is dereferrenced in nfs4_exchange_id_release
8950 *
8951 * Upon success, add the new transport to the rpc_clnt
8952 *
8953 * @clnt: struct rpc_clnt to get new transport
8954 * @xprt: the rpc_xprt to test
8955 * @data: call data for _nfs4_proc_exchange_id.
8956 */
nfs4_test_session_trunk(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * data)8957 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8958 void *data)
8959 {
8960 struct nfs4_add_xprt_data *adata = data;
8961 struct rpc_task *task;
8962 int status;
8963
8964 u32 sp4_how;
8965
8966 dprintk("--> %s try %s\n", __func__,
8967 xprt->address_strings[RPC_DISPLAY_ADDR]);
8968
8969 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8970
8971 try_again:
8972 /* Test connection for session trunking. Async exchange_id call */
8973 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8974 if (IS_ERR(task))
8975 return;
8976
8977 status = task->tk_status;
8978 if (status == 0) {
8979 status = nfs4_detect_session_trunking(adata->clp,
8980 task->tk_msg.rpc_resp, xprt);
8981 trace_nfs4_trunked_exchange_id(adata->clp,
8982 xprt->address_strings[RPC_DISPLAY_ADDR], status);
8983 }
8984 if (status == 0)
8985 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8986 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
8987 (struct sockaddr *)&xprt->addr))
8988 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8989
8990 rpc_put_task(task);
8991 if (status == -NFS4ERR_DELAY) {
8992 ssleep(1);
8993 goto try_again;
8994 }
8995 }
8996 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8997
_nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)8998 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8999 const struct cred *cred)
9000 {
9001 struct rpc_message msg = {
9002 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
9003 .rpc_argp = clp,
9004 .rpc_cred = cred,
9005 };
9006 int status;
9007
9008 status = rpc_call_sync(clp->cl_rpcclient, &msg,
9009 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9010 trace_nfs4_destroy_clientid(clp, status);
9011 if (status)
9012 dprintk("NFS: Got error %d from the server %s on "
9013 "DESTROY_CLIENTID.", status, clp->cl_hostname);
9014 return status;
9015 }
9016
nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)9017 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9018 const struct cred *cred)
9019 {
9020 unsigned int loop;
9021 int ret;
9022
9023 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9024 ret = _nfs4_proc_destroy_clientid(clp, cred);
9025 switch (ret) {
9026 case -NFS4ERR_DELAY:
9027 case -NFS4ERR_CLIENTID_BUSY:
9028 ssleep(1);
9029 break;
9030 default:
9031 return ret;
9032 }
9033 }
9034 return 0;
9035 }
9036
nfs4_destroy_clientid(struct nfs_client * clp)9037 int nfs4_destroy_clientid(struct nfs_client *clp)
9038 {
9039 const struct cred *cred;
9040 int ret = 0;
9041
9042 if (clp->cl_mvops->minor_version < 1)
9043 goto out;
9044 if (clp->cl_exchange_flags == 0)
9045 goto out;
9046 if (clp->cl_preserve_clid)
9047 goto out;
9048 cred = nfs4_get_clid_cred(clp);
9049 ret = nfs4_proc_destroy_clientid(clp, cred);
9050 put_cred(cred);
9051 switch (ret) {
9052 case 0:
9053 case -NFS4ERR_STALE_CLIENTID:
9054 clp->cl_exchange_flags = 0;
9055 }
9056 out:
9057 return ret;
9058 }
9059
9060 struct nfs4_get_lease_time_data {
9061 struct nfs4_get_lease_time_args *args;
9062 struct nfs4_get_lease_time_res *res;
9063 struct nfs_client *clp;
9064 };
9065
nfs4_get_lease_time_prepare(struct rpc_task * task,void * calldata)9066 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9067 void *calldata)
9068 {
9069 struct nfs4_get_lease_time_data *data =
9070 (struct nfs4_get_lease_time_data *)calldata;
9071
9072 /* just setup sequence, do not trigger session recovery
9073 since we're invoked within one */
9074 nfs4_setup_sequence(data->clp,
9075 &data->args->la_seq_args,
9076 &data->res->lr_seq_res,
9077 task);
9078 }
9079
9080 /*
9081 * Called from nfs4_state_manager thread for session setup, so don't recover
9082 * from sequence operation or clientid errors.
9083 */
nfs4_get_lease_time_done(struct rpc_task * task,void * calldata)9084 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9085 {
9086 struct nfs4_get_lease_time_data *data =
9087 (struct nfs4_get_lease_time_data *)calldata;
9088
9089 if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9090 return;
9091 switch (task->tk_status) {
9092 case -NFS4ERR_DELAY:
9093 case -NFS4ERR_GRACE:
9094 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9095 task->tk_status = 0;
9096 fallthrough;
9097 case -NFS4ERR_RETRY_UNCACHED_REP:
9098 rpc_restart_call_prepare(task);
9099 return;
9100 }
9101 }
9102
9103 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9104 .rpc_call_prepare = nfs4_get_lease_time_prepare,
9105 .rpc_call_done = nfs4_get_lease_time_done,
9106 };
9107
nfs4_proc_get_lease_time(struct nfs_client * clp,struct nfs_fsinfo * fsinfo)9108 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9109 {
9110 struct nfs4_get_lease_time_args args;
9111 struct nfs4_get_lease_time_res res = {
9112 .lr_fsinfo = fsinfo,
9113 };
9114 struct nfs4_get_lease_time_data data = {
9115 .args = &args,
9116 .res = &res,
9117 .clp = clp,
9118 };
9119 struct rpc_message msg = {
9120 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9121 .rpc_argp = &args,
9122 .rpc_resp = &res,
9123 };
9124 struct rpc_task_setup task_setup = {
9125 .rpc_client = clp->cl_rpcclient,
9126 .rpc_message = &msg,
9127 .callback_ops = &nfs4_get_lease_time_ops,
9128 .callback_data = &data,
9129 .flags = RPC_TASK_TIMEOUT,
9130 };
9131
9132 nfs4_init_sequence(clp, &args.la_seq_args, &res.lr_seq_res, 0, 1);
9133 return nfs4_call_sync_custom(&task_setup);
9134 }
9135
9136 /*
9137 * Initialize the values to be used by the client in CREATE_SESSION
9138 * If nfs4_init_session set the fore channel request and response sizes,
9139 * use them.
9140 *
9141 * Set the back channel max_resp_sz_cached to zero to force the client to
9142 * always set csa_cachethis to FALSE because the current implementation
9143 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9144 */
nfs4_init_channel_attrs(struct nfs41_create_session_args * args,struct rpc_clnt * clnt)9145 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9146 struct rpc_clnt *clnt)
9147 {
9148 unsigned int max_rqst_sz, max_resp_sz;
9149 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9150 unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9151
9152 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9153 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9154
9155 /* Fore channel attributes */
9156 args->fc_attrs.max_rqst_sz = max_rqst_sz;
9157 args->fc_attrs.max_resp_sz = max_resp_sz;
9158 args->fc_attrs.max_ops = NFS4_MAX_OPS;
9159 args->fc_attrs.max_reqs = max_session_slots;
9160
9161 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9162 "max_ops=%u max_reqs=%u\n",
9163 __func__,
9164 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9165 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9166
9167 /* Back channel attributes */
9168 args->bc_attrs.max_rqst_sz = max_bc_payload;
9169 args->bc_attrs.max_resp_sz = max_bc_payload;
9170 args->bc_attrs.max_resp_sz_cached = 0;
9171 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9172 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9173 if (args->bc_attrs.max_reqs > max_bc_slots)
9174 args->bc_attrs.max_reqs = max_bc_slots;
9175
9176 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9177 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9178 __func__,
9179 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9180 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9181 args->bc_attrs.max_reqs);
9182 }
9183
nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9184 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9185 struct nfs41_create_session_res *res)
9186 {
9187 struct nfs4_channel_attrs *sent = &args->fc_attrs;
9188 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9189
9190 if (rcvd->max_resp_sz > sent->max_resp_sz)
9191 return -EINVAL;
9192 /*
9193 * Our requested max_ops is the minimum we need; we're not
9194 * prepared to break up compounds into smaller pieces than that.
9195 * So, no point even trying to continue if the server won't
9196 * cooperate:
9197 */
9198 if (rcvd->max_ops < sent->max_ops)
9199 return -EINVAL;
9200 if (rcvd->max_reqs == 0)
9201 return -EINVAL;
9202 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9203 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9204 return 0;
9205 }
9206
nfs4_verify_back_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9207 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9208 struct nfs41_create_session_res *res)
9209 {
9210 struct nfs4_channel_attrs *sent = &args->bc_attrs;
9211 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9212
9213 if (!(res->flags & SESSION4_BACK_CHAN))
9214 goto out;
9215 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9216 return -EINVAL;
9217 if (rcvd->max_resp_sz > sent->max_resp_sz)
9218 return -EINVAL;
9219 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9220 return -EINVAL;
9221 if (rcvd->max_ops > sent->max_ops)
9222 return -EINVAL;
9223 if (rcvd->max_reqs > sent->max_reqs)
9224 return -EINVAL;
9225 out:
9226 return 0;
9227 }
9228
nfs4_verify_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9229 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9230 struct nfs41_create_session_res *res)
9231 {
9232 int ret;
9233
9234 ret = nfs4_verify_fore_channel_attrs(args, res);
9235 if (ret)
9236 return ret;
9237 return nfs4_verify_back_channel_attrs(args, res);
9238 }
9239
nfs4_update_session(struct nfs4_session * session,struct nfs41_create_session_res * res)9240 static void nfs4_update_session(struct nfs4_session *session,
9241 struct nfs41_create_session_res *res)
9242 {
9243 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9244 /* Mark client id and session as being confirmed */
9245 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9246 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9247 session->flags = res->flags;
9248 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9249 if (res->flags & SESSION4_BACK_CHAN)
9250 memcpy(&session->bc_attrs, &res->bc_attrs,
9251 sizeof(session->bc_attrs));
9252 }
9253
_nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9254 static int _nfs4_proc_create_session(struct nfs_client *clp,
9255 const struct cred *cred)
9256 {
9257 struct nfs4_session *session = clp->cl_session;
9258 struct nfs41_create_session_args args = {
9259 .client = clp,
9260 .clientid = clp->cl_clientid,
9261 .seqid = clp->cl_seqid,
9262 .cb_program = NFS4_CALLBACK,
9263 };
9264 struct nfs41_create_session_res res;
9265
9266 struct rpc_message msg = {
9267 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9268 .rpc_argp = &args,
9269 .rpc_resp = &res,
9270 .rpc_cred = cred,
9271 };
9272 int status;
9273
9274 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9275 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9276
9277 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9278 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9279 trace_nfs4_create_session(clp, status);
9280
9281 switch (status) {
9282 case -NFS4ERR_STALE_CLIENTID:
9283 case -NFS4ERR_DELAY:
9284 case -ETIMEDOUT:
9285 case -EACCES:
9286 case -EAGAIN:
9287 goto out;
9288 }
9289
9290 clp->cl_seqid++;
9291 if (!status) {
9292 /* Verify the session's negotiated channel_attrs values */
9293 status = nfs4_verify_channel_attrs(&args, &res);
9294 /* Increment the clientid slot sequence id */
9295 if (status)
9296 goto out;
9297 nfs4_update_session(session, &res);
9298 }
9299 out:
9300 return status;
9301 }
9302
9303 /*
9304 * Issues a CREATE_SESSION operation to the server.
9305 * It is the responsibility of the caller to verify the session is
9306 * expired before calling this routine.
9307 */
nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9308 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9309 {
9310 int status;
9311 unsigned *ptr;
9312 struct nfs4_session *session = clp->cl_session;
9313 struct nfs4_add_xprt_data xprtdata = {
9314 .clp = clp,
9315 };
9316 struct rpc_add_xprt_test rpcdata = {
9317 .add_xprt_test = clp->cl_mvops->session_trunk,
9318 .data = &xprtdata,
9319 };
9320
9321 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9322
9323 status = _nfs4_proc_create_session(clp, cred);
9324 if (status)
9325 goto out;
9326
9327 /* Init or reset the session slot tables */
9328 status = nfs4_setup_session_slot_tables(session);
9329 dprintk("slot table setup returned %d\n", status);
9330 if (status)
9331 goto out;
9332
9333 ptr = (unsigned *)&session->sess_id.data[0];
9334 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9335 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9336 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9337 out:
9338 return status;
9339 }
9340
9341 /*
9342 * Issue the over-the-wire RPC DESTROY_SESSION.
9343 * The caller must serialize access to this routine.
9344 */
nfs4_proc_destroy_session(struct nfs4_session * session,const struct cred * cred)9345 int nfs4_proc_destroy_session(struct nfs4_session *session,
9346 const struct cred *cred)
9347 {
9348 struct rpc_message msg = {
9349 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9350 .rpc_argp = session,
9351 .rpc_cred = cred,
9352 };
9353 int status = 0;
9354
9355 /* session is still being setup */
9356 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9357 return 0;
9358
9359 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9360 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9361 trace_nfs4_destroy_session(session->clp, status);
9362
9363 if (status)
9364 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9365 "Session has been destroyed regardless...\n", status);
9366 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9367 return status;
9368 }
9369
9370 /*
9371 * Renew the cl_session lease.
9372 */
9373 struct nfs4_sequence_data {
9374 struct nfs_client *clp;
9375 struct nfs4_sequence_args args;
9376 struct nfs4_sequence_res res;
9377 };
9378
nfs41_sequence_release(void * data)9379 static void nfs41_sequence_release(void *data)
9380 {
9381 struct nfs4_sequence_data *calldata = data;
9382 struct nfs_client *clp = calldata->clp;
9383
9384 if (refcount_read(&clp->cl_count) > 1)
9385 nfs4_schedule_state_renewal(clp);
9386 nfs_put_client(clp);
9387 kfree(calldata);
9388 }
9389
nfs41_sequence_handle_errors(struct rpc_task * task,struct nfs_client * clp)9390 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9391 {
9392 switch(task->tk_status) {
9393 case -NFS4ERR_DELAY:
9394 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9395 return -EAGAIN;
9396 default:
9397 nfs4_schedule_lease_recovery(clp);
9398 }
9399 return 0;
9400 }
9401
nfs41_sequence_call_done(struct rpc_task * task,void * data)9402 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9403 {
9404 struct nfs4_sequence_data *calldata = data;
9405 struct nfs_client *clp = calldata->clp;
9406
9407 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9408 return;
9409
9410 trace_nfs4_sequence(clp, task->tk_status);
9411 if (task->tk_status < 0 && clp->cl_cons_state >= 0) {
9412 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9413 if (refcount_read(&clp->cl_count) == 1)
9414 return;
9415
9416 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9417 rpc_restart_call_prepare(task);
9418 return;
9419 }
9420 }
9421 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9422 }
9423
nfs41_sequence_prepare(struct rpc_task * task,void * data)9424 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9425 {
9426 struct nfs4_sequence_data *calldata = data;
9427 struct nfs_client *clp = calldata->clp;
9428 struct nfs4_sequence_args *args;
9429 struct nfs4_sequence_res *res;
9430
9431 args = task->tk_msg.rpc_argp;
9432 res = task->tk_msg.rpc_resp;
9433
9434 nfs4_setup_sequence(clp, args, res, task);
9435 }
9436
9437 static const struct rpc_call_ops nfs41_sequence_ops = {
9438 .rpc_call_done = nfs41_sequence_call_done,
9439 .rpc_call_prepare = nfs41_sequence_prepare,
9440 .rpc_release = nfs41_sequence_release,
9441 };
9442
_nfs41_proc_sequence(struct nfs_client * clp,const struct cred * cred,struct nfs4_slot * slot,bool is_privileged)9443 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9444 const struct cred *cred,
9445 struct nfs4_slot *slot,
9446 bool is_privileged)
9447 {
9448 struct nfs4_sequence_data *calldata;
9449 struct rpc_message msg = {
9450 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9451 .rpc_cred = cred,
9452 };
9453 struct rpc_task_setup task_setup_data = {
9454 .rpc_client = clp->cl_rpcclient,
9455 .rpc_message = &msg,
9456 .callback_ops = &nfs41_sequence_ops,
9457 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9458 };
9459 struct rpc_task *ret;
9460
9461 ret = ERR_PTR(-EIO);
9462 if (!refcount_inc_not_zero(&clp->cl_count))
9463 goto out_err;
9464
9465 ret = ERR_PTR(-ENOMEM);
9466 calldata = kzalloc_obj(*calldata);
9467 if (calldata == NULL)
9468 goto out_put_clp;
9469 nfs4_init_sequence(clp, &calldata->args, &calldata->res, 0, is_privileged);
9470 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9471 msg.rpc_argp = &calldata->args;
9472 msg.rpc_resp = &calldata->res;
9473 calldata->clp = clp;
9474 task_setup_data.callback_data = calldata;
9475
9476 ret = rpc_run_task(&task_setup_data);
9477 if (IS_ERR(ret))
9478 goto out_err;
9479 return ret;
9480 out_put_clp:
9481 nfs_put_client(clp);
9482 out_err:
9483 nfs41_release_slot(slot);
9484 return ret;
9485 }
9486
nfs41_proc_async_sequence(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)9487 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9488 {
9489 struct rpc_task *task;
9490 int ret = 0;
9491
9492 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9493 return -EAGAIN;
9494 task = _nfs41_proc_sequence(clp, cred, NULL, false);
9495 if (IS_ERR(task))
9496 ret = PTR_ERR(task);
9497 else
9498 rpc_put_task_async(task);
9499 dprintk("<-- %s status=%d\n", __func__, ret);
9500 return ret;
9501 }
9502
nfs4_proc_sequence(struct nfs_client * clp,const struct cred * cred)9503 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9504 {
9505 struct rpc_task *task;
9506 int ret;
9507
9508 task = _nfs41_proc_sequence(clp, cred, NULL, true);
9509 if (IS_ERR(task)) {
9510 ret = PTR_ERR(task);
9511 goto out;
9512 }
9513 ret = rpc_wait_for_completion_task(task);
9514 if (!ret)
9515 ret = task->tk_status;
9516 rpc_put_task(task);
9517 out:
9518 dprintk("<-- %s status=%d\n", __func__, ret);
9519 return ret;
9520 }
9521
9522 struct nfs4_reclaim_complete_data {
9523 struct nfs_client *clp;
9524 struct nfs41_reclaim_complete_args arg;
9525 struct nfs41_reclaim_complete_res res;
9526 };
9527
nfs4_reclaim_complete_prepare(struct rpc_task * task,void * data)9528 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9529 {
9530 struct nfs4_reclaim_complete_data *calldata = data;
9531
9532 nfs4_setup_sequence(calldata->clp,
9533 &calldata->arg.seq_args,
9534 &calldata->res.seq_res,
9535 task);
9536 }
9537
nfs41_reclaim_complete_handle_errors(struct rpc_task * task,struct nfs_client * clp)9538 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9539 {
9540 switch(task->tk_status) {
9541 case 0:
9542 wake_up_all(&clp->cl_lock_waitq);
9543 fallthrough;
9544 case -NFS4ERR_COMPLETE_ALREADY:
9545 case -NFS4ERR_WRONG_CRED: /* What to do here? */
9546 break;
9547 case -NFS4ERR_DELAY:
9548 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9549 fallthrough;
9550 case -NFS4ERR_RETRY_UNCACHED_REP:
9551 case -EACCES:
9552 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9553 __func__, task->tk_status, clp->cl_hostname);
9554 return -EAGAIN;
9555 case -NFS4ERR_BADSESSION:
9556 case -NFS4ERR_DEADSESSION:
9557 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9558 break;
9559 default:
9560 nfs4_schedule_lease_recovery(clp);
9561 }
9562 return 0;
9563 }
9564
nfs4_reclaim_complete_done(struct rpc_task * task,void * data)9565 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9566 {
9567 struct nfs4_reclaim_complete_data *calldata = data;
9568 struct nfs_client *clp = calldata->clp;
9569 struct nfs4_sequence_res *res = &calldata->res.seq_res;
9570
9571 if (!nfs41_sequence_done(task, res))
9572 return;
9573
9574 trace_nfs4_reclaim_complete(clp, task->tk_status);
9575 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9576 rpc_restart_call_prepare(task);
9577 return;
9578 }
9579 }
9580
nfs4_free_reclaim_complete_data(void * data)9581 static void nfs4_free_reclaim_complete_data(void *data)
9582 {
9583 struct nfs4_reclaim_complete_data *calldata = data;
9584
9585 kfree(calldata);
9586 }
9587
9588 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9589 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9590 .rpc_call_done = nfs4_reclaim_complete_done,
9591 .rpc_release = nfs4_free_reclaim_complete_data,
9592 };
9593
9594 /*
9595 * Issue a global reclaim complete.
9596 */
nfs41_proc_reclaim_complete(struct nfs_client * clp,const struct cred * cred)9597 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9598 const struct cred *cred)
9599 {
9600 struct nfs4_reclaim_complete_data *calldata;
9601 struct rpc_message msg = {
9602 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9603 .rpc_cred = cred,
9604 };
9605 struct rpc_task_setup task_setup_data = {
9606 .rpc_client = clp->cl_rpcclient,
9607 .rpc_message = &msg,
9608 .callback_ops = &nfs4_reclaim_complete_call_ops,
9609 .flags = RPC_TASK_NO_ROUND_ROBIN,
9610 };
9611 int status = -ENOMEM;
9612
9613 calldata = kzalloc_obj(*calldata, GFP_NOFS);
9614 if (calldata == NULL)
9615 goto out;
9616 calldata->clp = clp;
9617 calldata->arg.one_fs = 0;
9618
9619 nfs4_init_sequence(clp, &calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9620 msg.rpc_argp = &calldata->arg;
9621 msg.rpc_resp = &calldata->res;
9622 task_setup_data.callback_data = calldata;
9623 status = nfs4_call_sync_custom(&task_setup_data);
9624 out:
9625 dprintk("<-- %s status=%d\n", __func__, status);
9626 return status;
9627 }
9628
9629 static void
nfs4_layoutget_prepare(struct rpc_task * task,void * calldata)9630 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9631 {
9632 struct nfs4_layoutget *lgp = calldata;
9633 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9634
9635 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9636 &lgp->res.seq_res, task);
9637 }
9638
nfs4_layoutget_done(struct rpc_task * task,void * calldata)9639 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9640 {
9641 struct nfs4_layoutget *lgp = calldata;
9642
9643 nfs41_sequence_process(task, &lgp->res.seq_res);
9644 }
9645
9646 static int
nfs4_layoutget_handle_exception(struct rpc_task * task,struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9647 nfs4_layoutget_handle_exception(struct rpc_task *task,
9648 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9649 {
9650 struct inode *inode = lgp->args.inode;
9651 struct nfs_server *server = NFS_SERVER(inode);
9652 struct pnfs_layout_hdr *lo = lgp->lo;
9653 int nfs4err = task->tk_status;
9654 int err, status = 0;
9655 LIST_HEAD(head);
9656
9657 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9658
9659 nfs4_sequence_free_slot(&lgp->res.seq_res);
9660
9661 exception->state = NULL;
9662 exception->stateid = NULL;
9663
9664 switch (nfs4err) {
9665 case 0:
9666 goto out;
9667
9668 /*
9669 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9670 * on the file. set tk_status to -ENODATA to tell upper layer to
9671 * retry go inband.
9672 */
9673 case -NFS4ERR_LAYOUTUNAVAILABLE:
9674 status = -ENODATA;
9675 goto out;
9676 /*
9677 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9678 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9679 */
9680 case -NFS4ERR_BADLAYOUT:
9681 status = -EOVERFLOW;
9682 goto out;
9683 /*
9684 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9685 * (or clients) writing to the same RAID stripe except when
9686 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9687 *
9688 * Treat it like we would RECALLCONFLICT -- we retry for a little
9689 * while, and then eventually give up.
9690 */
9691 case -NFS4ERR_LAYOUTTRYLATER:
9692 if (lgp->args.minlength == 0) {
9693 status = -EOVERFLOW;
9694 goto out;
9695 }
9696 status = -EBUSY;
9697 break;
9698 case -NFS4ERR_RECALLCONFLICT:
9699 case -NFS4ERR_RETURNCONFLICT:
9700 status = -ERECALLCONFLICT;
9701 break;
9702 case -NFS4ERR_DELEG_REVOKED:
9703 case -NFS4ERR_ADMIN_REVOKED:
9704 case -NFS4ERR_EXPIRED:
9705 case -NFS4ERR_BAD_STATEID:
9706 exception->timeout = 0;
9707 spin_lock(&inode->i_lock);
9708 /* If the open stateid was bad, then recover it. */
9709 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9710 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9711 spin_unlock(&inode->i_lock);
9712 exception->state = lgp->args.ctx->state;
9713 exception->stateid = &lgp->args.stateid;
9714 break;
9715 }
9716
9717 /*
9718 * Mark the bad layout state as invalid, then retry
9719 */
9720 pnfs_mark_layout_stateid_invalid(lo, &head);
9721 spin_unlock(&inode->i_lock);
9722 nfs_commit_inode(inode, 0);
9723 pnfs_free_lseg_list(&head);
9724 status = -EAGAIN;
9725 goto out;
9726 }
9727
9728 err = nfs4_handle_exception(server, nfs4err, exception);
9729 if (!status) {
9730 if (exception->retry)
9731 status = -EAGAIN;
9732 else
9733 status = err;
9734 }
9735 out:
9736 return status;
9737 }
9738
max_response_pages(struct nfs_server * server)9739 size_t max_response_pages(struct nfs_server *server)
9740 {
9741 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9742 return nfs_page_array_len(0, max_resp_sz);
9743 }
9744
nfs4_layoutget_release(void * calldata)9745 static void nfs4_layoutget_release(void *calldata)
9746 {
9747 struct nfs4_layoutget *lgp = calldata;
9748
9749 nfs4_sequence_free_slot(&lgp->res.seq_res);
9750 pnfs_layoutget_free(lgp);
9751 }
9752
9753 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9754 .rpc_call_prepare = nfs4_layoutget_prepare,
9755 .rpc_call_done = nfs4_layoutget_done,
9756 .rpc_release = nfs4_layoutget_release,
9757 };
9758
9759 struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9760 nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
9761 struct nfs4_exception *exception)
9762 {
9763 struct inode *inode = lgp->args.inode;
9764 struct nfs_server *server = NFS_SERVER(inode);
9765 struct rpc_task *task;
9766 struct rpc_message msg = {
9767 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9768 .rpc_argp = &lgp->args,
9769 .rpc_resp = &lgp->res,
9770 .rpc_cred = lgp->cred,
9771 };
9772 struct rpc_task_setup task_setup_data = {
9773 .rpc_client = server->client,
9774 .rpc_message = &msg,
9775 .callback_ops = &nfs4_layoutget_call_ops,
9776 .callback_data = lgp,
9777 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9778 RPC_TASK_MOVEABLE,
9779 };
9780 struct pnfs_layout_segment *lseg = NULL;
9781 int status = 0;
9782
9783 nfs4_init_sequence(server->nfs_client, &lgp->args.seq_args,
9784 &lgp->res.seq_res, 0, 0);
9785 exception->retry = 0;
9786
9787 task = rpc_run_task(&task_setup_data);
9788 if (IS_ERR(task))
9789 return ERR_CAST(task);
9790
9791 status = rpc_wait_for_completion_task(task);
9792 if (status != 0)
9793 goto out;
9794
9795 if (task->tk_status < 0) {
9796 exception->retry = 1;
9797 status = nfs4_layoutget_handle_exception(task, lgp, exception);
9798 } else if (lgp->res.layoutp->len == 0) {
9799 exception->retry = 1;
9800 status = -EAGAIN;
9801 nfs4_update_delay(&exception->timeout);
9802 } else
9803 lseg = pnfs_layout_process(lgp);
9804 out:
9805 trace_nfs4_layoutget(lgp->args.ctx,
9806 &lgp->args.range,
9807 &lgp->res.range,
9808 &lgp->res.stateid,
9809 status);
9810
9811 rpc_put_task(task);
9812 dprintk("<-- %s status=%d\n", __func__, status);
9813 if (status)
9814 return ERR_PTR(status);
9815 return lseg;
9816 }
9817
9818 static void
nfs4_layoutreturn_prepare(struct rpc_task * task,void * calldata)9819 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9820 {
9821 struct nfs4_layoutreturn *lrp = calldata;
9822
9823 nfs4_setup_sequence(lrp->clp,
9824 &lrp->args.seq_args,
9825 &lrp->res.seq_res,
9826 task);
9827 if (!pnfs_layout_is_valid(lrp->args.layout))
9828 rpc_exit(task, 0);
9829 }
9830
nfs4_layoutreturn_done(struct rpc_task * task,void * calldata)9831 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9832 {
9833 struct nfs4_layoutreturn *lrp = calldata;
9834 struct nfs_server *server;
9835
9836 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9837 return;
9838
9839 if (task->tk_rpc_status < 0) {
9840 switch (task->tk_rpc_status) {
9841 case -EACCES:
9842 case -EIO:
9843 case -EKEYEXPIRED:
9844 case -ERESTARTSYS:
9845 case -EINTR:
9846 lrp->rpc_status = 0;
9847 break;
9848 case -ENETDOWN:
9849 case -ENETUNREACH:
9850 if (task->tk_flags & RPC_TASK_NETUNREACH_FATAL)
9851 lrp->rpc_status = 0;
9852 else
9853 lrp->rpc_status = -EAGAIN;
9854 break;
9855 default:
9856 lrp->rpc_status = -EAGAIN;
9857 break;
9858 }
9859 lrp->res.lrs_present = 0;
9860 return;
9861 }
9862
9863 server = NFS_SERVER(lrp->args.inode);
9864 switch (task->tk_status) {
9865 case -NFS4ERR_OLD_STATEID:
9866 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9867 &lrp->args.range,
9868 lrp->args.inode))
9869 goto out_restart;
9870 fallthrough;
9871 default:
9872 task->tk_status = 0;
9873 lrp->res.lrs_present = 0;
9874 fallthrough;
9875 case 0:
9876 break;
9877 case -NFS4ERR_BADSESSION:
9878 case -NFS4ERR_DEADSESSION:
9879 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9880 nfs4_schedule_session_recovery(server->nfs_client->cl_session,
9881 task->tk_status);
9882 lrp->res.lrs_present = 0;
9883 lrp->rpc_status = -EAGAIN;
9884 task->tk_status = 0;
9885 break;
9886 case -NFS4ERR_DELAY:
9887 if (nfs4_async_handle_error(task, server, NULL, NULL) ==
9888 -EAGAIN)
9889 goto out_restart;
9890 lrp->res.lrs_present = 0;
9891 break;
9892 }
9893 return;
9894 out_restart:
9895 task->tk_status = 0;
9896 nfs4_sequence_free_slot(&lrp->res.seq_res);
9897 rpc_restart_call_prepare(task);
9898 }
9899
nfs4_layoutreturn_release(void * calldata)9900 static void nfs4_layoutreturn_release(void *calldata)
9901 {
9902 struct nfs4_layoutreturn *lrp = calldata;
9903 struct pnfs_layout_hdr *lo = lrp->args.layout;
9904
9905 if (lrp->rpc_status == 0 || !lrp->inode)
9906 pnfs_layoutreturn_free_lsegs(
9907 lo, &lrp->args.stateid, &lrp->args.range,
9908 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9909 else
9910 pnfs_layoutreturn_retry_later(lo, &lrp->args.stateid,
9911 &lrp->args.range);
9912 nfs4_sequence_free_slot(&lrp->res.seq_res);
9913 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9914 lrp->ld_private.ops->free(&lrp->ld_private);
9915 pnfs_put_layout_hdr(lrp->args.layout);
9916 nfs_iput_and_deactive(lrp->inode);
9917 put_cred(lrp->cred);
9918 kfree(calldata);
9919 }
9920
9921 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9922 .rpc_call_prepare = nfs4_layoutreturn_prepare,
9923 .rpc_call_done = nfs4_layoutreturn_done,
9924 .rpc_release = nfs4_layoutreturn_release,
9925 };
9926
nfs4_proc_layoutreturn(struct nfs4_layoutreturn * lrp,unsigned int flags)9927 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, unsigned int flags)
9928 {
9929 struct nfs_client *clp = NFS_SERVER(lrp->args.inode)->nfs_client;
9930 struct rpc_task *task;
9931 struct rpc_message msg = {
9932 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9933 .rpc_argp = &lrp->args,
9934 .rpc_resp = &lrp->res,
9935 .rpc_cred = lrp->cred,
9936 };
9937 struct rpc_task_setup task_setup_data = {
9938 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9939 .rpc_message = &msg,
9940 .callback_ops = &nfs4_layoutreturn_call_ops,
9941 .callback_data = lrp,
9942 .flags = RPC_TASK_MOVEABLE,
9943 };
9944 int status = 0;
9945
9946 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9947 &task_setup_data.rpc_client, &msg);
9948
9949 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9950 if (flags & PNFS_FL_LAYOUTRETURN_ASYNC) {
9951 if (!lrp->inode) {
9952 nfs4_layoutreturn_release(lrp);
9953 return -EAGAIN;
9954 }
9955 task_setup_data.flags |= RPC_TASK_ASYNC;
9956 }
9957 if (!lrp->inode)
9958 flags |= PNFS_FL_LAYOUTRETURN_PRIVILEGED;
9959
9960 nfs4_init_sequence(clp, &lrp->args.seq_args, &lrp->res.seq_res, 1,
9961 flags & PNFS_FL_LAYOUTRETURN_PRIVILEGED ? 1 : 0);
9962 task = rpc_run_task(&task_setup_data);
9963 if (IS_ERR(task))
9964 return PTR_ERR(task);
9965 if (!(flags & PNFS_FL_LAYOUTRETURN_ASYNC))
9966 status = task->tk_status;
9967 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9968 dprintk("<-- %s status=%d\n", __func__, status);
9969 rpc_put_task(task);
9970 return status;
9971 }
9972
9973 static int
_nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9974 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9975 struct pnfs_device *pdev,
9976 const struct cred *cred)
9977 {
9978 struct nfs4_getdeviceinfo_args args = {
9979 .pdev = pdev,
9980 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9981 NOTIFY_DEVICEID4_DELETE,
9982 };
9983 struct nfs4_getdeviceinfo_res res = {
9984 .pdev = pdev,
9985 };
9986 struct rpc_message msg = {
9987 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9988 .rpc_argp = &args,
9989 .rpc_resp = &res,
9990 .rpc_cred = cred,
9991 };
9992 int status;
9993
9994 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9995 if (res.notification & ~args.notify_types)
9996 dprintk("%s: unsupported notification\n", __func__);
9997 if (res.notification != args.notify_types)
9998 pdev->nocache = 1;
9999
10000 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
10001
10002 dprintk("<-- %s status=%d\n", __func__, status);
10003
10004 return status;
10005 }
10006
nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)10007 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
10008 struct pnfs_device *pdev,
10009 const struct cred *cred)
10010 {
10011 struct nfs4_exception exception = { };
10012 int err;
10013
10014 do {
10015 err = nfs4_handle_exception(server,
10016 _nfs4_proc_getdeviceinfo(server, pdev, cred),
10017 &exception);
10018 } while (exception.retry);
10019 return err;
10020 }
10021 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
10022
nfs4_layoutcommit_prepare(struct rpc_task * task,void * calldata)10023 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
10024 {
10025 struct nfs4_layoutcommit_data *data = calldata;
10026 struct nfs_server *server = NFS_SERVER(data->args.inode);
10027
10028 nfs4_setup_sequence(server->nfs_client,
10029 &data->args.seq_args,
10030 &data->res.seq_res,
10031 task);
10032 }
10033
10034 static void
nfs4_layoutcommit_done(struct rpc_task * task,void * calldata)10035 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
10036 {
10037 struct nfs4_layoutcommit_data *data = calldata;
10038 struct nfs_server *server = NFS_SERVER(data->args.inode);
10039
10040 if (!nfs41_sequence_done(task, &data->res.seq_res))
10041 return;
10042
10043 switch (task->tk_status) { /* Just ignore these failures */
10044 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
10045 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
10046 case -NFS4ERR_BADLAYOUT: /* no layout */
10047 case -NFS4ERR_GRACE: /* loca_recalim always false */
10048 task->tk_status = 0;
10049 break;
10050 case -NFS4ERR_OLD_STATEID: {
10051 u32 old_seqid = be32_to_cpu(data->args.stateid.seqid);
10052 struct pnfs_layout_range range = {
10053 .iomode = IOMODE_ANY,
10054 .offset = 0,
10055 .length = NFS4_MAX_UINT64,
10056 };
10057
10058 if (nfs4_layout_refresh_old_stateid(&data->args.stateid,
10059 &range,
10060 data->args.inode)) {
10061 struct pnfs_layout_hdr *lo;
10062
10063 spin_lock(&data->args.inode->i_lock);
10064 lo = NFS_I(data->args.inode)->layout;
10065 if (lo && pnfs_layout_is_valid(lo) &&
10066 nfs4_stateid_match_other(&data->args.stateid,
10067 &lo->plh_stateid))
10068 pnfs_set_layout_stateid(lo, &data->args.stateid,
10069 NULL, false);
10070 spin_unlock(&data->args.inode->i_lock);
10071
10072 dprintk("%s: refreshed OLD_STATEID inode %llu seq %u->%u\n",
10073 __func__, data->args.inode->i_ino,
10074 old_seqid,
10075 be32_to_cpu(data->args.stateid.seqid));
10076
10077 rpc_restart_call_prepare(task);
10078 return;
10079 }
10080 fallthrough;
10081 }
10082 case 0:
10083 break;
10084 default:
10085 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10086 rpc_restart_call_prepare(task);
10087 return;
10088 }
10089 }
10090 }
10091
nfs4_layoutcommit_release(void * calldata)10092 static void nfs4_layoutcommit_release(void *calldata)
10093 {
10094 struct nfs4_layoutcommit_data *data = calldata;
10095
10096 pnfs_cleanup_layoutcommit(data);
10097 nfs_post_op_update_inode_force_wcc(data->args.inode,
10098 data->res.fattr);
10099 put_cred(data->cred);
10100 nfs_iput_and_deactive(data->inode);
10101 kfree(data);
10102 }
10103
10104 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10105 .rpc_call_prepare = nfs4_layoutcommit_prepare,
10106 .rpc_call_done = nfs4_layoutcommit_done,
10107 .rpc_release = nfs4_layoutcommit_release,
10108 };
10109
10110 int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data * data,bool sync)10111 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10112 {
10113 struct rpc_message msg = {
10114 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10115 .rpc_argp = &data->args,
10116 .rpc_resp = &data->res,
10117 .rpc_cred = data->cred,
10118 };
10119 struct rpc_task_setup task_setup_data = {
10120 .task = &data->task,
10121 .rpc_client = NFS_CLIENT(data->args.inode),
10122 .rpc_message = &msg,
10123 .callback_ops = &nfs4_layoutcommit_ops,
10124 .callback_data = data,
10125 .flags = RPC_TASK_MOVEABLE,
10126 };
10127 struct rpc_task *task;
10128 int status = 0;
10129
10130 dprintk("NFS: initiating layoutcommit call. sync %d "
10131 "lbw: %llu inode %llu\n", sync,
10132 data->args.lastbytewritten,
10133 data->args.inode->i_ino);
10134
10135 if (!sync) {
10136 data->inode = nfs_igrab_and_active(data->args.inode);
10137 if (data->inode == NULL) {
10138 nfs4_layoutcommit_release(data);
10139 return -EAGAIN;
10140 }
10141 task_setup_data.flags = RPC_TASK_ASYNC;
10142 }
10143 nfs4_init_sequence(NFS_SERVER(data->args.inode)->nfs_client,
10144 &data->args.seq_args, &data->res.seq_res, 1, 0);
10145 task = rpc_run_task(&task_setup_data);
10146 if (IS_ERR(task))
10147 return PTR_ERR(task);
10148 if (sync)
10149 status = task->tk_status;
10150 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10151 dprintk("%s: status %d\n", __func__, status);
10152 rpc_put_task(task);
10153 return status;
10154 }
10155
10156 /*
10157 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10158 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10159 */
_nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_secinfo_flavors * flavors,bool use_integrity)10160 static int _nfs41_proc_secinfo_no_name(struct nfs_server *server,
10161 struct nfs_fh *fhandle,
10162 struct nfs4_secinfo_flavors *flavors,
10163 bool use_integrity)
10164 {
10165 struct nfs_client *clp = server->nfs_client;
10166 struct nfs41_secinfo_no_name_args args = {
10167 .style = SECINFO_STYLE_CURRENT_FH,
10168 };
10169 struct nfs4_secinfo_res res = {
10170 .flavors = flavors,
10171 };
10172 struct rpc_message msg = {
10173 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10174 .rpc_argp = &args,
10175 .rpc_resp = &res,
10176 };
10177 struct nfs4_call_sync_data data = {
10178 .seq_server = server,
10179 .seq_args = &args.seq_args,
10180 .seq_res = &res.seq_res,
10181 };
10182 struct rpc_task_setup task_setup = {
10183 .rpc_client = server->client,
10184 .rpc_message = &msg,
10185 .callback_ops = clp->cl_mvops->call_sync_ops,
10186 .callback_data = &data,
10187 .flags = RPC_TASK_NO_ROUND_ROBIN,
10188 };
10189 const struct cred *cred = NULL;
10190 int status;
10191
10192 if (use_integrity) {
10193 task_setup.rpc_client = clp->cl_rpcclient;
10194
10195 cred = nfs4_get_clid_cred(clp);
10196 msg.rpc_cred = cred;
10197 }
10198
10199 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 0);
10200 status = nfs4_call_sync_custom(&task_setup);
10201 dprintk("<-- %s status=%d\n", __func__, status);
10202
10203 put_cred(cred);
10204
10205 return status;
10206 }
10207
nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_secinfo_flavors * flavors)10208 static int nfs41_proc_secinfo_no_name(struct nfs_server *server,
10209 struct nfs_fh *fhandle,
10210 struct nfs4_secinfo_flavors *flavors)
10211 {
10212 struct nfs4_exception exception = {
10213 .interruptible = true,
10214 };
10215 int err;
10216 do {
10217 /* first try using integrity protection */
10218 err = -NFS4ERR_WRONGSEC;
10219
10220 /* try to use integrity protection with machine cred */
10221 if (_nfs4_is_integrity_protected(server->nfs_client))
10222 err = _nfs41_proc_secinfo_no_name(server, fhandle,
10223 flavors, true);
10224
10225 /*
10226 * if unable to use integrity protection, or SECINFO with
10227 * integrity protection returns NFS4ERR_WRONGSEC (which is
10228 * disallowed by spec, but exists in deployed servers) use
10229 * the current filesystem's rpc_client and the user cred.
10230 */
10231 if (err == -NFS4ERR_WRONGSEC)
10232 err = _nfs41_proc_secinfo_no_name(server, fhandle,
10233 flavors, false);
10234
10235 switch (err) {
10236 case 0:
10237 case -NFS4ERR_WRONGSEC:
10238 case -ENOTSUPP:
10239 goto out;
10240 default:
10241 err = nfs4_handle_exception(server, err, &exception);
10242 }
10243 } while (exception.retry);
10244 out:
10245 return err;
10246 }
10247
nfs41_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)10248 static int nfs41_find_root_sec(struct nfs_server *server,
10249 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
10250 {
10251 int err;
10252 struct page *page;
10253 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10254 struct nfs4_secinfo_flavors *flavors;
10255 struct nfs4_secinfo4 *secinfo;
10256 int i;
10257
10258 page = alloc_page(GFP_KERNEL);
10259 if (!page) {
10260 err = -ENOMEM;
10261 goto out;
10262 }
10263
10264 flavors = page_address(page);
10265 err = nfs41_proc_secinfo_no_name(server, fhandle, flavors);
10266
10267 /*
10268 * Fall back on "guess and check" method if
10269 * the server doesn't support SECINFO_NO_NAME
10270 */
10271 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10272 err = nfs4_find_root_sec(server, fhandle, fattr);
10273 goto out_freepage;
10274 }
10275 if (err)
10276 goto out_freepage;
10277
10278 for (i = 0; i < flavors->num_flavors; i++) {
10279 secinfo = &flavors->flavors[i];
10280
10281 switch (secinfo->flavor) {
10282 case RPC_AUTH_NULL:
10283 case RPC_AUTH_UNIX:
10284 case RPC_AUTH_GSS:
10285 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10286 &secinfo->flavor_info);
10287 break;
10288 default:
10289 flavor = RPC_AUTH_MAXFLAVOR;
10290 break;
10291 }
10292
10293 if (!nfs_auth_info_match(&server->auth_info, flavor))
10294 flavor = RPC_AUTH_MAXFLAVOR;
10295
10296 if (flavor != RPC_AUTH_MAXFLAVOR) {
10297 err = nfs4_lookup_root_sec(server, fhandle, fattr,
10298 flavor);
10299 if (!err)
10300 break;
10301 }
10302 }
10303
10304 if (flavor == RPC_AUTH_MAXFLAVOR)
10305 err = -EPERM;
10306
10307 out_freepage:
10308 put_page(page);
10309 if (err == -EACCES)
10310 return -EPERM;
10311 out:
10312 return err;
10313 }
10314
_nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10315 static int _nfs41_test_stateid(struct nfs_server *server,
10316 const nfs4_stateid *stateid,
10317 const struct cred *cred)
10318 {
10319 int status;
10320 struct nfs41_test_stateid_args args = {
10321 .stateid = *stateid,
10322 };
10323 struct nfs41_test_stateid_res res;
10324 struct rpc_message msg = {
10325 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10326 .rpc_argp = &args,
10327 .rpc_resp = &res,
10328 .rpc_cred = cred,
10329 };
10330 struct rpc_clnt *rpc_client = server->client;
10331 struct nfs_client *clp = server->nfs_client;
10332
10333 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_STATEID, &rpc_client, &msg);
10334
10335 dprintk("NFS call test_stateid %p\n", stateid);
10336 nfs4_init_sequence(clp, &args.seq_args, &res.seq_res, 0, 1);
10337 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10338 &args.seq_args, &res.seq_res);
10339 if (status != NFS_OK) {
10340 dprintk("NFS reply test_stateid: failed, %d\n", status);
10341 return status;
10342 }
10343 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10344 return -res.status;
10345 }
10346
nfs4_handle_delay_or_session_error(struct nfs_server * server,int err,struct nfs4_exception * exception)10347 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10348 int err, struct nfs4_exception *exception)
10349 {
10350 exception->retry = 0;
10351 switch(err) {
10352 case -NFS4ERR_DELAY:
10353 case -NFS4ERR_RETRY_UNCACHED_REP:
10354 nfs4_handle_exception(server, err, exception);
10355 break;
10356 case -NFS4ERR_BADSESSION:
10357 case -NFS4ERR_BADSLOT:
10358 case -NFS4ERR_BAD_HIGH_SLOT:
10359 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10360 case -NFS4ERR_DEADSESSION:
10361 nfs4_do_handle_exception(server, err, exception);
10362 }
10363 }
10364
10365 /**
10366 * nfs41_test_stateid - perform a TEST_STATEID operation
10367 *
10368 * @server: server / transport on which to perform the operation
10369 * @stateid: state ID to test
10370 * @cred: credential
10371 *
10372 * Returns NFS_OK if the server recognizes that "stateid" is valid.
10373 * Otherwise a negative NFS4ERR value is returned if the operation
10374 * failed or the state ID is not currently valid.
10375 */
nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10376 static int nfs41_test_stateid(struct nfs_server *server,
10377 const nfs4_stateid *stateid,
10378 const struct cred *cred)
10379 {
10380 struct nfs4_exception exception = {
10381 .interruptible = true,
10382 };
10383 int err;
10384 do {
10385 err = _nfs41_test_stateid(server, stateid, cred);
10386 nfs4_handle_delay_or_session_error(server, err, &exception);
10387 } while (exception.retry);
10388 return err;
10389 }
10390
10391 struct nfs_free_stateid_data {
10392 struct nfs_server *server;
10393 struct nfs41_free_stateid_args args;
10394 struct nfs41_free_stateid_res res;
10395 };
10396
nfs41_free_stateid_prepare(struct rpc_task * task,void * calldata)10397 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10398 {
10399 struct nfs_free_stateid_data *data = calldata;
10400 nfs4_setup_sequence(data->server->nfs_client,
10401 &data->args.seq_args,
10402 &data->res.seq_res,
10403 task);
10404 }
10405
nfs41_free_stateid_done(struct rpc_task * task,void * calldata)10406 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10407 {
10408 struct nfs_free_stateid_data *data = calldata;
10409
10410 nfs41_sequence_done(task, &data->res.seq_res);
10411
10412 switch (task->tk_status) {
10413 case -NFS4ERR_DELAY:
10414 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10415 rpc_restart_call_prepare(task);
10416 }
10417 }
10418
nfs41_free_stateid_release(void * calldata)10419 static void nfs41_free_stateid_release(void *calldata)
10420 {
10421 struct nfs_free_stateid_data *data = calldata;
10422 struct nfs_client *clp = data->server->nfs_client;
10423
10424 nfs_sb_deactive(data->server->super);
10425 nfs_put_client(clp);
10426 kfree(calldata);
10427 }
10428
10429 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10430 .rpc_call_prepare = nfs41_free_stateid_prepare,
10431 .rpc_call_done = nfs41_free_stateid_done,
10432 .rpc_release = nfs41_free_stateid_release,
10433 };
10434
10435 /**
10436 * nfs41_free_stateid - perform a FREE_STATEID operation
10437 *
10438 * @server: server / transport on which to perform the operation
10439 * @stateid: state ID to release
10440 * @cred: credential
10441 * @privileged: set to true if this call needs to be privileged
10442 *
10443 * Note: this function is always asynchronous.
10444 */
nfs41_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred,bool privileged)10445 static int nfs41_free_stateid(struct nfs_server *server,
10446 nfs4_stateid *stateid,
10447 const struct cred *cred,
10448 bool privileged)
10449 {
10450 struct rpc_message msg = {
10451 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10452 .rpc_cred = cred,
10453 };
10454 struct rpc_task_setup task_setup = {
10455 .rpc_client = server->client,
10456 .rpc_message = &msg,
10457 .callback_ops = &nfs41_free_stateid_ops,
10458 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10459 };
10460 struct nfs_free_stateid_data *data;
10461 struct rpc_task *task;
10462 struct nfs_client *clp = server->nfs_client;
10463 int ret = -EIO;
10464
10465 if (!refcount_inc_not_zero(&clp->cl_count))
10466 return ret;
10467 if (!nfs_sb_active(server->super))
10468 goto out_put_clp;
10469
10470 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_STATEID,
10471 &task_setup.rpc_client, &msg);
10472
10473 dprintk("NFS call free_stateid %p\n", stateid);
10474 data = kmalloc_obj(*data);
10475 if (!data) {
10476 ret = -ENOMEM;
10477 goto out_put_server;
10478 }
10479 data->server = server;
10480 nfs4_stateid_copy(&data->args.stateid, stateid);
10481
10482 task_setup.callback_data = data;
10483
10484 msg.rpc_argp = &data->args;
10485 msg.rpc_resp = &data->res;
10486 nfs4_init_sequence(clp, &data->args.seq_args, &data->res.seq_res, 1,
10487 privileged);
10488 task = rpc_run_task(&task_setup);
10489 if (IS_ERR(task))
10490 return PTR_ERR(task);
10491 rpc_put_task(task);
10492 stateid->type = NFS4_FREED_STATEID_TYPE;
10493 return 0;
10494 out_put_server:
10495 nfs_sb_deactive(server->super);
10496 out_put_clp:
10497 nfs_put_client(clp);
10498 return ret;
10499 }
10500
10501 static void
nfs41_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)10502 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10503 {
10504 const struct cred *cred = lsp->ls_state->owner->so_cred;
10505
10506 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10507 nfs4_free_lock_state(server, lsp);
10508 }
10509
nfs41_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10510 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10511 const nfs4_stateid *s2)
10512 {
10513 trace_nfs41_match_stateid(s1, s2);
10514
10515 if (s1->type != s2->type)
10516 return false;
10517
10518 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10519 return false;
10520
10521 if (s1->seqid == s2->seqid)
10522 return true;
10523
10524 return s1->seqid == 0 || s2->seqid == 0;
10525 }
10526
nfs4_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10527 bool nfs4_match_stateid(const nfs4_stateid *s1,
10528 const nfs4_stateid *s2)
10529 {
10530 trace_nfs4_match_stateid(s1, s2);
10531
10532 return nfs4_stateid_match(s1, s2);
10533 }
10534
10535
10536 static const struct nfs4_sequence_slot_ops nfs41_sequence_slot_ops = {
10537 .process = nfs41_sequence_process,
10538 .done = nfs41_sequence_done,
10539 .free_slot = nfs41_sequence_free_slot,
10540 };
10541
10542 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10543 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10544 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10545 .recover_open = nfs4_open_reclaim,
10546 .recover_lock = nfs4_lock_reclaim,
10547 .establish_clid = nfs41_init_clientid,
10548 .reclaim_complete = nfs41_proc_reclaim_complete,
10549 .detect_trunking = nfs41_discover_server_trunking,
10550 };
10551
10552 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10553 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10554 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10555 .recover_open = nfs41_open_expired,
10556 .recover_lock = nfs41_lock_expired,
10557 .establish_clid = nfs41_init_clientid,
10558 };
10559
10560 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10561 .sched_state_renewal = nfs41_proc_async_sequence,
10562 .get_state_renewal_cred = nfs4_get_machine_cred,
10563 .renew_lease = nfs4_proc_sequence,
10564 };
10565
10566 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10567 .get_locations = _nfs41_proc_get_locations,
10568 .fsid_present = _nfs41_proc_fsid_present,
10569 };
10570
10571 static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter * arg1,gfp_t arg2)10572 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10573 {
10574 return NULL;
10575 }
10576
10577 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10578 .minor_version = 1,
10579 .init_caps = NFS_CAP_READDIRPLUS
10580 | NFS_CAP_ATOMIC_OPEN
10581 | NFS_CAP_DIR_DELEG
10582 | NFS_CAP_POSIX_LOCK
10583 | NFS_CAP_STATEID_NFSV41
10584 | NFS_CAP_ATOMIC_OPEN_V1
10585 | NFS_CAP_LGOPEN
10586 | NFS_CAP_MOVEABLE,
10587 .init_client = nfs41_init_client,
10588 .shutdown_client = nfs41_shutdown_client,
10589 .match_stateid = nfs41_match_stateid,
10590 .find_root_sec = nfs41_find_root_sec,
10591 .free_lock_state = nfs41_free_lock_state,
10592 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10593 .alloc_seqid = nfs_alloc_no_seqid,
10594 .session_trunk = nfs4_test_session_trunk,
10595 .call_sync_ops = &nfs41_call_sync_ops,
10596 .sequence_slot_ops = &nfs41_sequence_slot_ops,
10597 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10598 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10599 .state_renewal_ops = &nfs41_state_renewal_ops,
10600 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10601 };
10602
10603 #if defined(CONFIG_NFS_V4_2)
10604 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10605 .minor_version = 2,
10606 .init_caps = NFS_CAP_READDIRPLUS
10607 | NFS_CAP_ATOMIC_OPEN
10608 | NFS_CAP_DIR_DELEG
10609 | NFS_CAP_POSIX_LOCK
10610 | NFS_CAP_STATEID_NFSV41
10611 | NFS_CAP_ATOMIC_OPEN_V1
10612 | NFS_CAP_LGOPEN
10613 | NFS_CAP_ALLOCATE
10614 | NFS_CAP_COPY
10615 | NFS_CAP_OFFLOAD_CANCEL
10616 | NFS_CAP_COPY_NOTIFY
10617 | NFS_CAP_DEALLOCATE
10618 | NFS_CAP_ZERO_RANGE
10619 | NFS_CAP_SEEK
10620 | NFS_CAP_LAYOUTSTATS
10621 | NFS_CAP_CLONE
10622 | NFS_CAP_LAYOUTERROR
10623 | NFS_CAP_READ_PLUS
10624 | NFS_CAP_MOVEABLE
10625 | NFS_CAP_OFFLOAD_STATUS,
10626 .init_client = nfs41_init_client,
10627 .shutdown_client = nfs41_shutdown_client,
10628 .match_stateid = nfs41_match_stateid,
10629 .find_root_sec = nfs41_find_root_sec,
10630 .free_lock_state = nfs41_free_lock_state,
10631 .call_sync_ops = &nfs41_call_sync_ops,
10632 .sequence_slot_ops = &nfs41_sequence_slot_ops,
10633 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10634 .alloc_seqid = nfs_alloc_no_seqid,
10635 .session_trunk = nfs4_test_session_trunk,
10636 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10637 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10638 .state_renewal_ops = &nfs41_state_renewal_ops,
10639 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10640 };
10641 #endif
10642
10643 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10644 #if defined(CONFIG_NFS_V4_0)
10645 [0] = &nfs_v4_0_minor_ops,
10646 #endif /* CONFIG_NFS_V4_0 */
10647 [1] = &nfs_v4_1_minor_ops,
10648 #if defined(CONFIG_NFS_V4_2)
10649 [2] = &nfs_v4_2_minor_ops,
10650 #endif
10651 };
10652
nfs4_listxattr(struct dentry * dentry,char * list,size_t size)10653 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10654 {
10655 ssize_t error, error2, error3;
10656 ssize_t left = size;
10657 ssize_t left2;
10658
10659 error = generic_listxattr(dentry, list, left);
10660 if (error < 0)
10661 return error;
10662 if (list) {
10663 list += error;
10664 left -= error;
10665 }
10666
10667 left2 = left;
10668 error2 = security_inode_listsecurity(d_inode(dentry), &list, &left2);
10669 if (error2 < 0)
10670 return error2;
10671 error2 = left - left2;
10672 if (list)
10673 left -= error2;
10674
10675 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10676 if (error3 < 0)
10677 return error3;
10678
10679 error += error2 + error3;
10680 if (size && error > size)
10681 return -ERANGE;
10682 return error;
10683 }
10684
nfs4_enable_swap(struct inode * inode)10685 static void nfs4_enable_swap(struct inode *inode)
10686 {
10687 /* The state manager thread must always be running.
10688 * It will notice the client is a swapper, and stay put.
10689 */
10690 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10691
10692 nfs4_schedule_state_manager(clp);
10693 }
10694
nfs4_disable_swap(struct inode * inode)10695 static void nfs4_disable_swap(struct inode *inode)
10696 {
10697 /* The state manager thread will now exit once it is
10698 * woken.
10699 */
10700 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10701
10702 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10703 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10704 wake_up_var(&clp->cl_state);
10705 }
10706
10707 static const struct inode_operations nfs4_dir_inode_operations = {
10708 .create = nfs_create,
10709 .lookup = nfs_lookup,
10710 .atomic_open = nfs_atomic_open,
10711 .link = nfs_link,
10712 .unlink = nfs_unlink,
10713 .symlink = nfs_symlink,
10714 .mkdir = nfs_mkdir,
10715 .rmdir = nfs_rmdir,
10716 .mknod = nfs_mknod,
10717 .rename = nfs_rename,
10718 .permission = nfs_permission,
10719 .getattr = nfs_getattr,
10720 .setattr = nfs_setattr,
10721 .listxattr = nfs4_listxattr,
10722 .fileattr_get = nfs_fileattr_get,
10723 };
10724
10725 static const struct inode_operations nfs4_file_inode_operations = {
10726 .permission = nfs_permission,
10727 .getattr = nfs_getattr,
10728 .setattr = nfs_setattr,
10729 .listxattr = nfs4_listxattr,
10730 .fileattr_get = nfs_fileattr_get,
10731 };
10732
nfs4_clone_server(struct nfs_server * source,struct nfs_fh * fh,struct nfs_fattr * fattr,rpc_authflavor_t flavor)10733 static struct nfs_server *nfs4_clone_server(struct nfs_server *source,
10734 struct nfs_fh *fh, struct nfs_fattr *fattr,
10735 rpc_authflavor_t flavor)
10736 {
10737 struct nfs_server *server;
10738 int error;
10739
10740 server = nfs_clone_server(source, fh, fattr, flavor);
10741 if (IS_ERR(server))
10742 return server;
10743
10744 nfs4_session_limit_rwsize(server);
10745 nfs4_session_limit_xasize(server);
10746
10747 error = nfs4_delegation_hash_alloc(server);
10748 if (error) {
10749 nfs_free_server(server);
10750 return ERR_PTR(error);
10751 }
10752
10753 return server;
10754 }
10755
10756 const struct nfs_rpc_ops nfs_v4_clientops = {
10757 .version = 4, /* protocol version */
10758 .dentry_ops = &nfs4_dentry_operations,
10759 .dir_inode_ops = &nfs4_dir_inode_operations,
10760 .file_inode_ops = &nfs4_file_inode_operations,
10761 .file_ops = &nfs4_file_operations,
10762 .getroot = nfs4_proc_get_root,
10763 .submount = nfs4_submount,
10764 .try_get_tree = nfs4_try_get_tree,
10765 .getattr = nfs4_proc_getattr,
10766 .setattr = nfs4_proc_setattr,
10767 .lookup = nfs4_proc_lookup,
10768 .lookupp = nfs4_proc_lookupp,
10769 .access = nfs4_proc_access,
10770 .readlink = nfs4_proc_readlink,
10771 .create = nfs4_proc_create,
10772 .remove = nfs4_proc_remove,
10773 .unlink_setup = nfs4_proc_unlink_setup,
10774 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10775 .unlink_done = nfs4_proc_unlink_done,
10776 .rename_setup = nfs4_proc_rename_setup,
10777 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10778 .rename_done = nfs4_proc_rename_done,
10779 .link = nfs4_proc_link,
10780 .symlink = nfs4_proc_symlink,
10781 .mkdir = nfs4_proc_mkdir,
10782 .rmdir = nfs4_proc_rmdir,
10783 .readdir = nfs4_proc_readdir,
10784 .mknod = nfs4_proc_mknod,
10785 .statfs = nfs4_proc_statfs,
10786 .fsinfo = nfs4_proc_fsinfo,
10787 .pathconf = nfs4_proc_pathconf,
10788 .set_capabilities = nfs4_server_capabilities,
10789 .decode_dirent = nfs4_decode_dirent,
10790 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10791 .read_setup = nfs4_proc_read_setup,
10792 .read_done = nfs4_read_done,
10793 .write_setup = nfs4_proc_write_setup,
10794 .write_done = nfs4_write_done,
10795 .commit_setup = nfs4_proc_commit_setup,
10796 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10797 .commit_done = nfs4_commit_done,
10798 .lock = nfs4_proc_lock,
10799 .clear_acl_cache = nfs4_zap_acl_attr,
10800 .close_context = nfs4_close_context,
10801 .open_context = nfs4_atomic_open,
10802 .have_delegation = nfs4_have_delegation,
10803 .return_delegation = nfs4_inode_return_delegation,
10804 .alloc_client = nfs4_alloc_client,
10805 .init_client = nfs4_init_client,
10806 .free_client = nfs4_free_client,
10807 .create_server = nfs4_create_server,
10808 .clone_server = nfs4_clone_server,
10809 .discover_trunking = nfs4_discover_trunking,
10810 .enable_swap = nfs4_enable_swap,
10811 .disable_swap = nfs4_disable_swap,
10812 };
10813
10814 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10815 .name = XATTR_NAME_NFSV4_ACL,
10816 .list = nfs4_xattr_list_nfs4_acl,
10817 .get = nfs4_xattr_get_nfs4_acl,
10818 .set = nfs4_xattr_set_nfs4_acl,
10819 };
10820
10821 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10822 .name = XATTR_NAME_NFSV4_DACL,
10823 .list = nfs4_xattr_list_nfs4_dacl,
10824 .get = nfs4_xattr_get_nfs4_dacl,
10825 .set = nfs4_xattr_set_nfs4_dacl,
10826 };
10827
10828 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10829 .name = XATTR_NAME_NFSV4_SACL,
10830 .list = nfs4_xattr_list_nfs4_sacl,
10831 .get = nfs4_xattr_get_nfs4_sacl,
10832 .set = nfs4_xattr_set_nfs4_sacl,
10833 };
10834
10835 #ifdef CONFIG_NFS_V4_2
10836 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10837 .prefix = XATTR_USER_PREFIX,
10838 .get = nfs4_xattr_get_nfs4_user,
10839 .set = nfs4_xattr_set_nfs4_user,
10840 };
10841 #endif
10842
10843 const struct xattr_handler * const nfs4_xattr_handlers[] = {
10844 &nfs4_xattr_nfs4_acl_handler,
10845 &nfs4_xattr_nfs4_dacl_handler,
10846 &nfs4_xattr_nfs4_sacl_handler,
10847 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10848 &nfs4_xattr_nfs4_label_handler,
10849 #endif
10850 #ifdef CONFIG_NFS_V4_2
10851 &nfs4_xattr_nfs4_user_handler,
10852 #endif
10853 NULL
10854 };
10855