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