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Revert "tty: hvc: Fix data abort due to race in hvc_open"
[linux/fpc-iii.git] / fs / nfs / nfs4proc.c
blobe32717fd1169a90f47ddf16cc88116ac113672b8
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 "nfs4idmap.h"
67 #include "nfs4session.h"
68 #include "fscache.h"
69
70 #include "nfs4trace.h"
71
72 #define NFSDBG_FACILITY NFSDBG_PROC
73
74 #define NFS4_BITMASK_SZ 3
75
76 #define NFS4_POLL_RETRY_MIN (HZ/10)
77 #define NFS4_POLL_RETRY_MAX (15*HZ)
78
79 /* file attributes which can be mapped to nfs attributes */
80 #define NFS4_VALID_ATTRS (ATTR_MODE \
81 | ATTR_UID \
82 | ATTR_GID \
83 | ATTR_SIZE \
84 | ATTR_ATIME \
85 | ATTR_MTIME \
86 | ATTR_CTIME \
87 | ATTR_ATIME_SET \
88 | ATTR_MTIME_SET)
89
90 struct nfs4_opendata;
91 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
92 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
93 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
95 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
96 struct nfs_fattr *fattr, struct iattr *sattr,
97 struct nfs_open_context *ctx, struct nfs4_label *ilabel,
98 struct nfs4_label *olabel);
99 #ifdef CONFIG_NFS_V4_1
100 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
101 const struct cred *cred,
102 struct nfs4_slot *slot,
103 bool is_privileged);
104 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
105 const struct cred *);
106 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
107 const struct cred *, bool);
108 #endif
109
110 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
111 static inline struct nfs4_label *
112 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
113 struct iattr *sattr, struct nfs4_label *label)
114 {
115 int err;
116
117 if (label == NULL)
118 return NULL;
119
120 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
121 return NULL;
122
123 err = security_dentry_init_security(dentry, sattr->ia_mode,
124 &dentry->d_name, (void **)&label->label, &label->len);
125 if (err == 0)
126 return label;
127
128 return NULL;
129 }
130 static inline void
131 nfs4_label_release_security(struct nfs4_label *label)
132 {
133 if (label)
134 security_release_secctx(label->label, label->len);
135 }
136 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
137 {
138 if (label)
139 return server->attr_bitmask;
140
141 return server->attr_bitmask_nl;
142 }
143 #else
144 static inline struct nfs4_label *
145 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
146 struct iattr *sattr, struct nfs4_label *l)
147 { return NULL; }
148 static inline void
149 nfs4_label_release_security(struct nfs4_label *label)
150 { return; }
151 static inline u32 *
152 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
153 { return server->attr_bitmask; }
154 #endif
155
156 /* Prevent leaks of NFSv4 errors into userland */
157 static int nfs4_map_errors(int err)
158 {
159 if (err >= -1000)
160 return err;
161 switch (err) {
162 case -NFS4ERR_RESOURCE:
163 case -NFS4ERR_LAYOUTTRYLATER:
164 case -NFS4ERR_RECALLCONFLICT:
165 return -EREMOTEIO;
166 case -NFS4ERR_WRONGSEC:
167 case -NFS4ERR_WRONG_CRED:
168 return -EPERM;
169 case -NFS4ERR_BADOWNER:
170 case -NFS4ERR_BADNAME:
171 return -EINVAL;
172 case -NFS4ERR_SHARE_DENIED:
173 return -EACCES;
174 case -NFS4ERR_MINOR_VERS_MISMATCH:
175 return -EPROTONOSUPPORT;
176 case -NFS4ERR_FILE_OPEN:
177 return -EBUSY;
178 default:
179 dprintk("%s could not handle NFSv4 error %d\n",
180 __func__, -err);
181 break;
182 }
183 return -EIO;
184 }
185
186 /*
187 * This is our standard bitmap for GETATTR requests.
188 */
189 const u32 nfs4_fattr_bitmap[3] = {
190 FATTR4_WORD0_TYPE
191 | FATTR4_WORD0_CHANGE
192 | FATTR4_WORD0_SIZE
193 | FATTR4_WORD0_FSID
194 | FATTR4_WORD0_FILEID,
195 FATTR4_WORD1_MODE
196 | FATTR4_WORD1_NUMLINKS
197 | FATTR4_WORD1_OWNER
198 | FATTR4_WORD1_OWNER_GROUP
199 | FATTR4_WORD1_RAWDEV
200 | FATTR4_WORD1_SPACE_USED
201 | FATTR4_WORD1_TIME_ACCESS
202 | FATTR4_WORD1_TIME_METADATA
203 | FATTR4_WORD1_TIME_MODIFY
204 | FATTR4_WORD1_MOUNTED_ON_FILEID,
205 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
206 FATTR4_WORD2_SECURITY_LABEL
207 #endif
208 };
209
210 static const u32 nfs4_pnfs_open_bitmap[3] = {
211 FATTR4_WORD0_TYPE
212 | FATTR4_WORD0_CHANGE
213 | FATTR4_WORD0_SIZE
214 | FATTR4_WORD0_FSID
215 | FATTR4_WORD0_FILEID,
216 FATTR4_WORD1_MODE
217 | FATTR4_WORD1_NUMLINKS
218 | FATTR4_WORD1_OWNER
219 | FATTR4_WORD1_OWNER_GROUP
220 | FATTR4_WORD1_RAWDEV
221 | FATTR4_WORD1_SPACE_USED
222 | FATTR4_WORD1_TIME_ACCESS
223 | FATTR4_WORD1_TIME_METADATA
224 | FATTR4_WORD1_TIME_MODIFY,
225 FATTR4_WORD2_MDSTHRESHOLD
226 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
227 | FATTR4_WORD2_SECURITY_LABEL
228 #endif
229 };
230
231 static const u32 nfs4_open_noattr_bitmap[3] = {
232 FATTR4_WORD0_TYPE
233 | FATTR4_WORD0_FILEID,
234 };
235
236 const u32 nfs4_statfs_bitmap[3] = {
237 FATTR4_WORD0_FILES_AVAIL
238 | FATTR4_WORD0_FILES_FREE
239 | FATTR4_WORD0_FILES_TOTAL,
240 FATTR4_WORD1_SPACE_AVAIL
241 | FATTR4_WORD1_SPACE_FREE
242 | FATTR4_WORD1_SPACE_TOTAL
243 };
244
245 const u32 nfs4_pathconf_bitmap[3] = {
246 FATTR4_WORD0_MAXLINK
247 | FATTR4_WORD0_MAXNAME,
248 0
249 };
250
251 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
252 | FATTR4_WORD0_MAXREAD
253 | FATTR4_WORD0_MAXWRITE
254 | FATTR4_WORD0_LEASE_TIME,
255 FATTR4_WORD1_TIME_DELTA
256 | FATTR4_WORD1_FS_LAYOUT_TYPES,
257 FATTR4_WORD2_LAYOUT_BLKSIZE
258 | FATTR4_WORD2_CLONE_BLKSIZE
259 };
260
261 const u32 nfs4_fs_locations_bitmap[3] = {
262 FATTR4_WORD0_CHANGE
263 | FATTR4_WORD0_SIZE
264 | FATTR4_WORD0_FSID
265 | FATTR4_WORD0_FILEID
266 | FATTR4_WORD0_FS_LOCATIONS,
267 FATTR4_WORD1_OWNER
268 | FATTR4_WORD1_OWNER_GROUP
269 | FATTR4_WORD1_RAWDEV
270 | FATTR4_WORD1_SPACE_USED
271 | FATTR4_WORD1_TIME_ACCESS
272 | FATTR4_WORD1_TIME_METADATA
273 | FATTR4_WORD1_TIME_MODIFY
274 | FATTR4_WORD1_MOUNTED_ON_FILEID,
275 };
276
277 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
278 struct inode *inode)
279 {
280 unsigned long cache_validity;
281
282 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
283 if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
284 return;
285
286 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
287 if (!(cache_validity & NFS_INO_REVAL_FORCED))
288 cache_validity &= ~(NFS_INO_INVALID_CHANGE
289 | NFS_INO_INVALID_SIZE);
290
291 if (!(cache_validity & NFS_INO_INVALID_SIZE))
292 dst[0] &= ~FATTR4_WORD0_SIZE;
293
294 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
295 dst[0] &= ~FATTR4_WORD0_CHANGE;
296 }
297
298 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst,
299 const __u32 *src, struct inode *inode)
300 {
301 nfs4_bitmap_copy_adjust(dst, src, inode);
302 }
303
304 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
305 struct nfs4_readdir_arg *readdir)
306 {
307 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
308 __be32 *start, *p;
309
310 if (cookie > 2) {
311 readdir->cookie = cookie;
312 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
313 return;
314 }
315
316 readdir->cookie = 0;
317 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
318 if (cookie == 2)
319 return;
320
321 /*
322 * NFSv4 servers do not return entries for '.' and '..'
323 * Therefore, we fake these entries here. We let '.'
324 * have cookie 0 and '..' have cookie 1. Note that
325 * when talking to the server, we always send cookie 0
326 * instead of 1 or 2.
327 */
328 start = p = kmap_atomic(*readdir->pages);
329
330 if (cookie == 0) {
331 *p++ = xdr_one; /* next */
332 *p++ = xdr_zero; /* cookie, first word */
333 *p++ = xdr_one; /* cookie, second word */
334 *p++ = xdr_one; /* entry len */
335 memcpy(p, ".\0\0\0", 4); /* entry */
336 p++;
337 *p++ = xdr_one; /* bitmap length */
338 *p++ = htonl(attrs); /* bitmap */
339 *p++ = htonl(12); /* attribute buffer length */
340 *p++ = htonl(NF4DIR);
341 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
342 }
343
344 *p++ = xdr_one; /* next */
345 *p++ = xdr_zero; /* cookie, first word */
346 *p++ = xdr_two; /* cookie, second word */
347 *p++ = xdr_two; /* entry len */
348 memcpy(p, "..\0\0", 4); /* entry */
349 p++;
350 *p++ = xdr_one; /* bitmap length */
351 *p++ = htonl(attrs); /* bitmap */
352 *p++ = htonl(12); /* attribute buffer length */
353 *p++ = htonl(NF4DIR);
354 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
355
356 readdir->pgbase = (char *)p - (char *)start;
357 readdir->count -= readdir->pgbase;
358 kunmap_atomic(start);
359 }
360
361 static void nfs4_test_and_free_stateid(struct nfs_server *server,
362 nfs4_stateid *stateid,
363 const struct cred *cred)
364 {
365 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
366
367 ops->test_and_free_expired(server, stateid, cred);
368 }
369
370 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
371 nfs4_stateid *stateid,
372 const struct cred *cred)
373 {
374 stateid->type = NFS4_REVOKED_STATEID_TYPE;
375 nfs4_test_and_free_stateid(server, stateid, cred);
376 }
377
378 static void nfs4_free_revoked_stateid(struct nfs_server *server,
379 const nfs4_stateid *stateid,
380 const struct cred *cred)
381 {
382 nfs4_stateid tmp;
383
384 nfs4_stateid_copy(&tmp, stateid);
385 __nfs4_free_revoked_stateid(server, &tmp, cred);
386 }
387
388 static long nfs4_update_delay(long *timeout)
389 {
390 long ret;
391 if (!timeout)
392 return NFS4_POLL_RETRY_MAX;
393 if (*timeout <= 0)
394 *timeout = NFS4_POLL_RETRY_MIN;
395 if (*timeout > NFS4_POLL_RETRY_MAX)
396 *timeout = NFS4_POLL_RETRY_MAX;
397 ret = *timeout;
398 *timeout <<= 1;
399 return ret;
400 }
401
402 static int nfs4_delay_killable(long *timeout)
403 {
404 might_sleep();
405
406 freezable_schedule_timeout_killable_unsafe(
407 nfs4_update_delay(timeout));
408 if (!__fatal_signal_pending(current))
409 return 0;
410 return -EINTR;
411 }
412
413 static int nfs4_delay_interruptible(long *timeout)
414 {
415 might_sleep();
416
417 freezable_schedule_timeout_interruptible(nfs4_update_delay(timeout));
418 if (!signal_pending(current))
419 return 0;
420 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
421 }
422
423 static int nfs4_delay(long *timeout, bool interruptible)
424 {
425 if (interruptible)
426 return nfs4_delay_interruptible(timeout);
427 return nfs4_delay_killable(timeout);
428 }
429
430 static const nfs4_stateid *
431 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
432 {
433 if (!stateid)
434 return NULL;
435 switch (stateid->type) {
436 case NFS4_OPEN_STATEID_TYPE:
437 case NFS4_LOCK_STATEID_TYPE:
438 case NFS4_DELEGATION_STATEID_TYPE:
439 return stateid;
440 default:
441 break;
442 }
443 return NULL;
444 }
445
446 /* This is the error handling routine for processes that are allowed
447 * to sleep.
448 */
449 static int nfs4_do_handle_exception(struct nfs_server *server,
450 int errorcode, struct nfs4_exception *exception)
451 {
452 struct nfs_client *clp = server->nfs_client;
453 struct nfs4_state *state = exception->state;
454 const nfs4_stateid *stateid;
455 struct inode *inode = exception->inode;
456 int ret = errorcode;
457
458 exception->delay = 0;
459 exception->recovering = 0;
460 exception->retry = 0;
461
462 stateid = nfs4_recoverable_stateid(exception->stateid);
463 if (stateid == NULL && state != NULL)
464 stateid = nfs4_recoverable_stateid(&state->stateid);
465
466 switch(errorcode) {
467 case 0:
468 return 0;
469 case -NFS4ERR_BADHANDLE:
470 case -ESTALE:
471 if (inode != NULL && S_ISREG(inode->i_mode))
472 pnfs_destroy_layout(NFS_I(inode));
473 break;
474 case -NFS4ERR_DELEG_REVOKED:
475 case -NFS4ERR_ADMIN_REVOKED:
476 case -NFS4ERR_EXPIRED:
477 case -NFS4ERR_BAD_STATEID:
478 case -NFS4ERR_PARTNER_NO_AUTH:
479 if (inode != NULL && stateid != NULL) {
480 nfs_inode_find_state_and_recover(inode,
481 stateid);
482 goto wait_on_recovery;
483 }
484 /* Fall through */
485 case -NFS4ERR_OPENMODE:
486 if (inode) {
487 int err;
488
489 err = nfs_async_inode_return_delegation(inode,
490 stateid);
491 if (err == 0)
492 goto wait_on_recovery;
493 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
494 exception->retry = 1;
495 break;
496 }
497 }
498 if (state == NULL)
499 break;
500 ret = nfs4_schedule_stateid_recovery(server, state);
501 if (ret < 0)
502 break;
503 goto wait_on_recovery;
504 case -NFS4ERR_STALE_STATEID:
505 case -NFS4ERR_STALE_CLIENTID:
506 nfs4_schedule_lease_recovery(clp);
507 goto wait_on_recovery;
508 case -NFS4ERR_MOVED:
509 ret = nfs4_schedule_migration_recovery(server);
510 if (ret < 0)
511 break;
512 goto wait_on_recovery;
513 case -NFS4ERR_LEASE_MOVED:
514 nfs4_schedule_lease_moved_recovery(clp);
515 goto wait_on_recovery;
516 #if defined(CONFIG_NFS_V4_1)
517 case -NFS4ERR_BADSESSION:
518 case -NFS4ERR_BADSLOT:
519 case -NFS4ERR_BAD_HIGH_SLOT:
520 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
521 case -NFS4ERR_DEADSESSION:
522 case -NFS4ERR_SEQ_FALSE_RETRY:
523 case -NFS4ERR_SEQ_MISORDERED:
524 /* Handled in nfs41_sequence_process() */
525 goto wait_on_recovery;
526 #endif /* defined(CONFIG_NFS_V4_1) */
527 case -NFS4ERR_FILE_OPEN:
528 if (exception->timeout > HZ) {
529 /* We have retried a decent amount, time to
530 * fail
531 */
532 ret = -EBUSY;
533 break;
534 }
535 /* Fall through */
536 case -NFS4ERR_DELAY:
537 nfs_inc_server_stats(server, NFSIOS_DELAY);
538 /* Fall through */
539 case -NFS4ERR_GRACE:
540 case -NFS4ERR_LAYOUTTRYLATER:
541 case -NFS4ERR_RECALLCONFLICT:
542 exception->delay = 1;
543 return 0;
544
545 case -NFS4ERR_RETRY_UNCACHED_REP:
546 case -NFS4ERR_OLD_STATEID:
547 exception->retry = 1;
548 break;
549 case -NFS4ERR_BADOWNER:
550 /* The following works around a Linux server bug! */
551 case -NFS4ERR_BADNAME:
552 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
553 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
554 exception->retry = 1;
555 printk(KERN_WARNING "NFS: v4 server %s "
556 "does not accept raw "
557 "uid/gids. "
558 "Reenabling the idmapper.\n",
559 server->nfs_client->cl_hostname);
560 }
561 }
562 /* We failed to handle the error */
563 return nfs4_map_errors(ret);
564 wait_on_recovery:
565 exception->recovering = 1;
566 return 0;
567 }
568
569 /* This is the error handling routine for processes that are allowed
570 * to sleep.
571 */
572 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
573 {
574 struct nfs_client *clp = server->nfs_client;
575 int ret;
576
577 ret = nfs4_do_handle_exception(server, errorcode, exception);
578 if (exception->delay) {
579 ret = nfs4_delay(&exception->timeout,
580 exception->interruptible);
581 goto out_retry;
582 }
583 if (exception->recovering) {
584 ret = nfs4_wait_clnt_recover(clp);
585 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
586 return -EIO;
587 goto out_retry;
588 }
589 return ret;
590 out_retry:
591 if (ret == 0)
592 exception->retry = 1;
593 return ret;
594 }
595
596 static int
597 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
598 int errorcode, struct nfs4_exception *exception)
599 {
600 struct nfs_client *clp = server->nfs_client;
601 int ret;
602
603 ret = nfs4_do_handle_exception(server, errorcode, exception);
604 if (exception->delay) {
605 rpc_delay(task, nfs4_update_delay(&exception->timeout));
606 goto out_retry;
607 }
608 if (exception->recovering) {
609 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
610 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
611 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
612 goto out_retry;
613 }
614 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
615 ret = -EIO;
616 return ret;
617 out_retry:
618 if (ret == 0) {
619 exception->retry = 1;
620 /*
621 * For NFS4ERR_MOVED, the client transport will need to
622 * be recomputed after migration recovery has completed.
623 */
624 if (errorcode == -NFS4ERR_MOVED)
625 rpc_task_release_transport(task);
626 }
627 return ret;
628 }
629
630 int
631 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
632 struct nfs4_state *state, long *timeout)
633 {
634 struct nfs4_exception exception = {
635 .state = state,
636 };
637
638 if (task->tk_status >= 0)
639 return 0;
640 if (timeout)
641 exception.timeout = *timeout;
642 task->tk_status = nfs4_async_handle_exception(task, server,
643 task->tk_status,
644 &exception);
645 if (exception.delay && timeout)
646 *timeout = exception.timeout;
647 if (exception.retry)
648 return -EAGAIN;
649 return 0;
650 }
651
652 /*
653 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
654 * or 'false' otherwise.
655 */
656 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
657 {
658 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
659 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
660 }
661
662 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
663 {
664 spin_lock(&clp->cl_lock);
665 if (time_before(clp->cl_last_renewal,timestamp))
666 clp->cl_last_renewal = timestamp;
667 spin_unlock(&clp->cl_lock);
668 }
669
670 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
671 {
672 struct nfs_client *clp = server->nfs_client;
673
674 if (!nfs4_has_session(clp))
675 do_renew_lease(clp, timestamp);
676 }
677
678 struct nfs4_call_sync_data {
679 const struct nfs_server *seq_server;
680 struct nfs4_sequence_args *seq_args;
681 struct nfs4_sequence_res *seq_res;
682 };
683
684 void nfs4_init_sequence(struct nfs4_sequence_args *args,
685 struct nfs4_sequence_res *res, int cache_reply,
686 int privileged)
687 {
688 args->sa_slot = NULL;
689 args->sa_cache_this = cache_reply;
690 args->sa_privileged = privileged;
691
692 res->sr_slot = NULL;
693 }
694
695 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
696 {
697 struct nfs4_slot *slot = res->sr_slot;
698 struct nfs4_slot_table *tbl;
699
700 tbl = slot->table;
701 spin_lock(&tbl->slot_tbl_lock);
702 if (!nfs41_wake_and_assign_slot(tbl, slot))
703 nfs4_free_slot(tbl, slot);
704 spin_unlock(&tbl->slot_tbl_lock);
705
706 res->sr_slot = NULL;
707 }
708
709 static int nfs40_sequence_done(struct rpc_task *task,
710 struct nfs4_sequence_res *res)
711 {
712 if (res->sr_slot != NULL)
713 nfs40_sequence_free_slot(res);
714 return 1;
715 }
716
717 #if defined(CONFIG_NFS_V4_1)
718
719 static void nfs41_release_slot(struct nfs4_slot *slot)
720 {
721 struct nfs4_session *session;
722 struct nfs4_slot_table *tbl;
723 bool send_new_highest_used_slotid = false;
724
725 if (!slot)
726 return;
727 tbl = slot->table;
728 session = tbl->session;
729
730 /* Bump the slot sequence number */
731 if (slot->seq_done)
732 slot->seq_nr++;
733 slot->seq_done = 0;
734
735 spin_lock(&tbl->slot_tbl_lock);
736 /* Be nice to the server: try to ensure that the last transmitted
737 * value for highest_user_slotid <= target_highest_slotid
738 */
739 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
740 send_new_highest_used_slotid = true;
741
742 if (nfs41_wake_and_assign_slot(tbl, slot)) {
743 send_new_highest_used_slotid = false;
744 goto out_unlock;
745 }
746 nfs4_free_slot(tbl, slot);
747
748 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
749 send_new_highest_used_slotid = false;
750 out_unlock:
751 spin_unlock(&tbl->slot_tbl_lock);
752 if (send_new_highest_used_slotid)
753 nfs41_notify_server(session->clp);
754 if (waitqueue_active(&tbl->slot_waitq))
755 wake_up_all(&tbl->slot_waitq);
756 }
757
758 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
759 {
760 nfs41_release_slot(res->sr_slot);
761 res->sr_slot = NULL;
762 }
763
764 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
765 u32 seqnr)
766 {
767 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
768 slot->seq_nr_highest_sent = seqnr;
769 }
770 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot,
771 u32 seqnr)
772 {
773 slot->seq_nr_highest_sent = seqnr;
774 slot->seq_nr_last_acked = seqnr;
775 }
776
777 static int nfs41_sequence_process(struct rpc_task *task,
778 struct nfs4_sequence_res *res)
779 {
780 struct nfs4_session *session;
781 struct nfs4_slot *slot = res->sr_slot;
782 struct nfs_client *clp;
783 int status;
784 int ret = 1;
785
786 if (slot == NULL)
787 goto out_noaction;
788 /* don't increment the sequence number if the task wasn't sent */
789 if (!RPC_WAS_SENT(task) || slot->seq_done)
790 goto out;
791
792 session = slot->table->session;
793
794 trace_nfs4_sequence_done(session, res);
795
796 status = res->sr_status;
797 if (task->tk_status == -NFS4ERR_DEADSESSION)
798 status = -NFS4ERR_DEADSESSION;
799
800 /* Check the SEQUENCE operation status */
801 switch (status) {
802 case 0:
803 /* Mark this sequence number as having been acked */
804 nfs4_slot_sequence_acked(slot, slot->seq_nr);
805 /* Update the slot's sequence and clientid lease timer */
806 slot->seq_done = 1;
807 clp = session->clp;
808 do_renew_lease(clp, res->sr_timestamp);
809 /* Check sequence flags */
810 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
811 !!slot->privileged);
812 nfs41_update_target_slotid(slot->table, slot, res);
813 break;
814 case 1:
815 /*
816 * sr_status remains 1 if an RPC level error occurred.
817 * The server may or may not have processed the sequence
818 * operation..
819 */
820 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
821 slot->seq_done = 1;
822 goto out;
823 case -NFS4ERR_DELAY:
824 /* The server detected a resend of the RPC call and
825 * returned NFS4ERR_DELAY as per Section 2.10.6.2
826 * of RFC5661.
827 */
828 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
829 __func__,
830 slot->slot_nr,
831 slot->seq_nr);
832 nfs4_slot_sequence_acked(slot, slot->seq_nr);
833 goto out_retry;
834 case -NFS4ERR_RETRY_UNCACHED_REP:
835 case -NFS4ERR_SEQ_FALSE_RETRY:
836 /*
837 * The server thinks we tried to replay a request.
838 * Retry the call after bumping the sequence ID.
839 */
840 nfs4_slot_sequence_acked(slot, slot->seq_nr);
841 goto retry_new_seq;
842 case -NFS4ERR_BADSLOT:
843 /*
844 * The slot id we used was probably retired. Try again
845 * using a different slot id.
846 */
847 if (slot->slot_nr < slot->table->target_highest_slotid)
848 goto session_recover;
849 goto retry_nowait;
850 case -NFS4ERR_SEQ_MISORDERED:
851 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
852 /*
853 * Were one or more calls using this slot interrupted?
854 * If the server never received the request, then our
855 * transmitted slot sequence number may be too high.
856 */
857 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
858 slot->seq_nr--;
859 goto retry_nowait;
860 }
861 /*
862 * RFC5661:
863 * A retry might be sent while the original request is
864 * still in progress on the replier. The replier SHOULD
865 * deal with the issue by returning NFS4ERR_DELAY as the
866 * reply to SEQUENCE or CB_SEQUENCE operation, but
867 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
868 *
869 * Restart the search after a delay.
870 */
871 slot->seq_nr = slot->seq_nr_highest_sent;
872 goto out_retry;
873 case -NFS4ERR_BADSESSION:
874 case -NFS4ERR_DEADSESSION:
875 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
876 goto session_recover;
877 default:
878 /* Just update the slot sequence no. */
879 slot->seq_done = 1;
880 }
881 out:
882 /* The session may be reset by one of the error handlers. */
883 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
884 out_noaction:
885 return ret;
886 session_recover:
887 nfs4_schedule_session_recovery(session, status);
888 dprintk("%s ERROR: %d Reset session\n", __func__, status);
889 nfs41_sequence_free_slot(res);
890 goto out;
891 retry_new_seq:
892 ++slot->seq_nr;
893 retry_nowait:
894 if (rpc_restart_call_prepare(task)) {
895 nfs41_sequence_free_slot(res);
896 task->tk_status = 0;
897 ret = 0;
898 }
899 goto out;
900 out_retry:
901 if (!rpc_restart_call(task))
902 goto out;
903 rpc_delay(task, NFS4_POLL_RETRY_MAX);
904 return 0;
905 }
906
907 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
908 {
909 if (!nfs41_sequence_process(task, res))
910 return 0;
911 if (res->sr_slot != NULL)
912 nfs41_sequence_free_slot(res);
913 return 1;
914
915 }
916 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
917
918 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
919 {
920 if (res->sr_slot == NULL)
921 return 1;
922 if (res->sr_slot->table->session != NULL)
923 return nfs41_sequence_process(task, res);
924 return nfs40_sequence_done(task, res);
925 }
926
927 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
928 {
929 if (res->sr_slot != NULL) {
930 if (res->sr_slot->table->session != NULL)
931 nfs41_sequence_free_slot(res);
932 else
933 nfs40_sequence_free_slot(res);
934 }
935 }
936
937 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
938 {
939 if (res->sr_slot == NULL)
940 return 1;
941 if (!res->sr_slot->table->session)
942 return nfs40_sequence_done(task, res);
943 return nfs41_sequence_done(task, res);
944 }
945 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
946
947 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
948 {
949 struct nfs4_call_sync_data *data = calldata;
950
951 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
952
953 nfs4_setup_sequence(data->seq_server->nfs_client,
954 data->seq_args, data->seq_res, task);
955 }
956
957 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
958 {
959 struct nfs4_call_sync_data *data = calldata;
960
961 nfs41_sequence_done(task, data->seq_res);
962 }
963
964 static const struct rpc_call_ops nfs41_call_sync_ops = {
965 .rpc_call_prepare = nfs41_call_sync_prepare,
966 .rpc_call_done = nfs41_call_sync_done,
967 };
968
969 #else /* !CONFIG_NFS_V4_1 */
970
971 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
972 {
973 return nfs40_sequence_done(task, res);
974 }
975
976 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
977 {
978 if (res->sr_slot != NULL)
979 nfs40_sequence_free_slot(res);
980 }
981
982 int nfs4_sequence_done(struct rpc_task *task,
983 struct nfs4_sequence_res *res)
984 {
985 return nfs40_sequence_done(task, res);
986 }
987 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
988
989 #endif /* !CONFIG_NFS_V4_1 */
990
991 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
992 {
993 res->sr_timestamp = jiffies;
994 res->sr_status_flags = 0;
995 res->sr_status = 1;
996 }
997
998 static
999 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1000 struct nfs4_sequence_res *res,
1001 struct nfs4_slot *slot)
1002 {
1003 if (!slot)
1004 return;
1005 slot->privileged = args->sa_privileged ? 1 : 0;
1006 args->sa_slot = slot;
1007
1008 res->sr_slot = slot;
1009 }
1010
1011 int nfs4_setup_sequence(struct nfs_client *client,
1012 struct nfs4_sequence_args *args,
1013 struct nfs4_sequence_res *res,
1014 struct rpc_task *task)
1015 {
1016 struct nfs4_session *session = nfs4_get_session(client);
1017 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
1018 struct nfs4_slot *slot;
1019
1020 /* slot already allocated? */
1021 if (res->sr_slot != NULL)
1022 goto out_start;
1023
1024 if (session)
1025 tbl = &session->fc_slot_table;
1026
1027 spin_lock(&tbl->slot_tbl_lock);
1028 /* The state manager will wait until the slot table is empty */
1029 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1030 goto out_sleep;
1031
1032 slot = nfs4_alloc_slot(tbl);
1033 if (IS_ERR(slot)) {
1034 if (slot == ERR_PTR(-ENOMEM))
1035 goto out_sleep_timeout;
1036 goto out_sleep;
1037 }
1038 spin_unlock(&tbl->slot_tbl_lock);
1039
1040 nfs4_sequence_attach_slot(args, res, slot);
1041
1042 trace_nfs4_setup_sequence(session, args);
1043 out_start:
1044 nfs41_sequence_res_init(res);
1045 rpc_call_start(task);
1046 return 0;
1047 out_sleep_timeout:
1048 /* Try again in 1/4 second */
1049 if (args->sa_privileged)
1050 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1051 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1052 else
1053 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1054 NULL, jiffies + (HZ >> 2));
1055 spin_unlock(&tbl->slot_tbl_lock);
1056 return -EAGAIN;
1057 out_sleep:
1058 if (args->sa_privileged)
1059 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1060 RPC_PRIORITY_PRIVILEGED);
1061 else
1062 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1063 spin_unlock(&tbl->slot_tbl_lock);
1064 return -EAGAIN;
1065 }
1066 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1067
1068 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1069 {
1070 struct nfs4_call_sync_data *data = calldata;
1071 nfs4_setup_sequence(data->seq_server->nfs_client,
1072 data->seq_args, data->seq_res, task);
1073 }
1074
1075 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1076 {
1077 struct nfs4_call_sync_data *data = calldata;
1078 nfs4_sequence_done(task, data->seq_res);
1079 }
1080
1081 static const struct rpc_call_ops nfs40_call_sync_ops = {
1082 .rpc_call_prepare = nfs40_call_sync_prepare,
1083 .rpc_call_done = nfs40_call_sync_done,
1084 };
1085
1086 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1087 {
1088 int ret;
1089 struct rpc_task *task;
1090
1091 task = rpc_run_task(task_setup);
1092 if (IS_ERR(task))
1093 return PTR_ERR(task);
1094
1095 ret = task->tk_status;
1096 rpc_put_task(task);
1097 return ret;
1098 }
1099
1100 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1101 struct nfs_server *server,
1102 struct rpc_message *msg,
1103 struct nfs4_sequence_args *args,
1104 struct nfs4_sequence_res *res,
1105 unsigned short task_flags)
1106 {
1107 struct nfs_client *clp = server->nfs_client;
1108 struct nfs4_call_sync_data data = {
1109 .seq_server = server,
1110 .seq_args = args,
1111 .seq_res = res,
1112 };
1113 struct rpc_task_setup task_setup = {
1114 .rpc_client = clnt,
1115 .rpc_message = msg,
1116 .callback_ops = clp->cl_mvops->call_sync_ops,
1117 .callback_data = &data,
1118 .flags = task_flags,
1119 };
1120
1121 return nfs4_call_sync_custom(&task_setup);
1122 }
1123
1124 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1125 struct nfs_server *server,
1126 struct rpc_message *msg,
1127 struct nfs4_sequence_args *args,
1128 struct nfs4_sequence_res *res)
1129 {
1130 return nfs4_do_call_sync(clnt, server, msg, args, res, 0);
1131 }
1132
1133
1134 int nfs4_call_sync(struct rpc_clnt *clnt,
1135 struct nfs_server *server,
1136 struct rpc_message *msg,
1137 struct nfs4_sequence_args *args,
1138 struct nfs4_sequence_res *res,
1139 int cache_reply)
1140 {
1141 nfs4_init_sequence(args, res, cache_reply, 0);
1142 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1143 }
1144
1145 static void
1146 nfs4_inc_nlink_locked(struct inode *inode)
1147 {
1148 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1149 inc_nlink(inode);
1150 }
1151
1152 static void
1153 nfs4_dec_nlink_locked(struct inode *inode)
1154 {
1155 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1156 drop_nlink(inode);
1157 }
1158
1159 static void
1160 update_changeattr_locked(struct inode *dir, struct nfs4_change_info *cinfo,
1161 unsigned long timestamp, unsigned long cache_validity)
1162 {
1163 struct nfs_inode *nfsi = NFS_I(dir);
1164
1165 nfsi->cache_validity |= NFS_INO_INVALID_CTIME
1166 | NFS_INO_INVALID_MTIME
1167 | NFS_INO_INVALID_DATA
1168 | cache_validity;
1169 if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) {
1170 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1171 nfsi->attrtimeo_timestamp = jiffies;
1172 } else {
1173 nfs_force_lookup_revalidate(dir);
1174 if (cinfo->before != inode_peek_iversion_raw(dir))
1175 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
1176 NFS_INO_INVALID_ACL;
1177 }
1178 inode_set_iversion_raw(dir, cinfo->after);
1179 nfsi->read_cache_jiffies = timestamp;
1180 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1181 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1182 nfs_fscache_invalidate(dir);
1183 }
1184
1185 static void
1186 update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1187 unsigned long timestamp, unsigned long cache_validity)
1188 {
1189 spin_lock(&dir->i_lock);
1190 update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1191 spin_unlock(&dir->i_lock);
1192 }
1193
1194 struct nfs4_open_createattrs {
1195 struct nfs4_label *label;
1196 struct iattr *sattr;
1197 const __u32 verf[2];
1198 };
1199
1200 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1201 int err, struct nfs4_exception *exception)
1202 {
1203 if (err != -EINVAL)
1204 return false;
1205 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1206 return false;
1207 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1208 exception->retry = 1;
1209 return true;
1210 }
1211
1212 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1213 {
1214 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1215 }
1216
1217 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1218 {
1219 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1220
1221 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1222 }
1223
1224 static u32
1225 nfs4_map_atomic_open_share(struct nfs_server *server,
1226 fmode_t fmode, int openflags)
1227 {
1228 u32 res = 0;
1229
1230 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1231 case FMODE_READ:
1232 res = NFS4_SHARE_ACCESS_READ;
1233 break;
1234 case FMODE_WRITE:
1235 res = NFS4_SHARE_ACCESS_WRITE;
1236 break;
1237 case FMODE_READ|FMODE_WRITE:
1238 res = NFS4_SHARE_ACCESS_BOTH;
1239 }
1240 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1241 goto out;
1242 /* Want no delegation if we're using O_DIRECT */
1243 if (openflags & O_DIRECT)
1244 res |= NFS4_SHARE_WANT_NO_DELEG;
1245 out:
1246 return res;
1247 }
1248
1249 static enum open_claim_type4
1250 nfs4_map_atomic_open_claim(struct nfs_server *server,
1251 enum open_claim_type4 claim)
1252 {
1253 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1254 return claim;
1255 switch (claim) {
1256 default:
1257 return claim;
1258 case NFS4_OPEN_CLAIM_FH:
1259 return NFS4_OPEN_CLAIM_NULL;
1260 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1261 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1262 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1263 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1264 }
1265 }
1266
1267 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1268 {
1269 p->o_res.f_attr = &p->f_attr;
1270 p->o_res.f_label = p->f_label;
1271 p->o_res.seqid = p->o_arg.seqid;
1272 p->c_res.seqid = p->c_arg.seqid;
1273 p->o_res.server = p->o_arg.server;
1274 p->o_res.access_request = p->o_arg.access;
1275 nfs_fattr_init(&p->f_attr);
1276 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1277 }
1278
1279 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1280 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1281 const struct nfs4_open_createattrs *c,
1282 enum open_claim_type4 claim,
1283 gfp_t gfp_mask)
1284 {
1285 struct dentry *parent = dget_parent(dentry);
1286 struct inode *dir = d_inode(parent);
1287 struct nfs_server *server = NFS_SERVER(dir);
1288 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1289 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1290 struct nfs4_opendata *p;
1291
1292 p = kzalloc(sizeof(*p), gfp_mask);
1293 if (p == NULL)
1294 goto err;
1295
1296 p->f_label = nfs4_label_alloc(server, gfp_mask);
1297 if (IS_ERR(p->f_label))
1298 goto err_free_p;
1299
1300 p->a_label = nfs4_label_alloc(server, gfp_mask);
1301 if (IS_ERR(p->a_label))
1302 goto err_free_f;
1303
1304 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1305 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1306 if (IS_ERR(p->o_arg.seqid))
1307 goto err_free_label;
1308 nfs_sb_active(dentry->d_sb);
1309 p->dentry = dget(dentry);
1310 p->dir = parent;
1311 p->owner = sp;
1312 atomic_inc(&sp->so_count);
1313 p->o_arg.open_flags = flags;
1314 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1315 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1316 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1317 fmode, flags);
1318 if (flags & O_CREAT) {
1319 p->o_arg.umask = current_umask();
1320 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1321 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1322 p->o_arg.u.attrs = &p->attrs;
1323 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1324
1325 memcpy(p->o_arg.u.verifier.data, c->verf,
1326 sizeof(p->o_arg.u.verifier.data));
1327 }
1328 }
1329 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1330 * will return permission denied for all bits until close */
1331 if (!(flags & O_EXCL)) {
1332 /* ask server to check for all possible rights as results
1333 * are cached */
1334 switch (p->o_arg.claim) {
1335 default:
1336 break;
1337 case NFS4_OPEN_CLAIM_NULL:
1338 case NFS4_OPEN_CLAIM_FH:
1339 p->o_arg.access = NFS4_ACCESS_READ |
1340 NFS4_ACCESS_MODIFY |
1341 NFS4_ACCESS_EXTEND |
1342 NFS4_ACCESS_EXECUTE;
1343 }
1344 }
1345 p->o_arg.clientid = server->nfs_client->cl_clientid;
1346 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1347 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1348 p->o_arg.name = &dentry->d_name;
1349 p->o_arg.server = server;
1350 p->o_arg.bitmask = nfs4_bitmask(server, label);
1351 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1352 switch (p->o_arg.claim) {
1353 case NFS4_OPEN_CLAIM_NULL:
1354 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1355 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1356 p->o_arg.fh = NFS_FH(dir);
1357 break;
1358 case NFS4_OPEN_CLAIM_PREVIOUS:
1359 case NFS4_OPEN_CLAIM_FH:
1360 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1361 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1362 p->o_arg.fh = NFS_FH(d_inode(dentry));
1363 }
1364 p->c_arg.fh = &p->o_res.fh;
1365 p->c_arg.stateid = &p->o_res.stateid;
1366 p->c_arg.seqid = p->o_arg.seqid;
1367 nfs4_init_opendata_res(p);
1368 kref_init(&p->kref);
1369 return p;
1370
1371 err_free_label:
1372 nfs4_label_free(p->a_label);
1373 err_free_f:
1374 nfs4_label_free(p->f_label);
1375 err_free_p:
1376 kfree(p);
1377 err:
1378 dput(parent);
1379 return NULL;
1380 }
1381
1382 static void nfs4_opendata_free(struct kref *kref)
1383 {
1384 struct nfs4_opendata *p = container_of(kref,
1385 struct nfs4_opendata, kref);
1386 struct super_block *sb = p->dentry->d_sb;
1387
1388 nfs4_lgopen_release(p->lgp);
1389 nfs_free_seqid(p->o_arg.seqid);
1390 nfs4_sequence_free_slot(&p->o_res.seq_res);
1391 if (p->state != NULL)
1392 nfs4_put_open_state(p->state);
1393 nfs4_put_state_owner(p->owner);
1394
1395 nfs4_label_free(p->a_label);
1396 nfs4_label_free(p->f_label);
1397
1398 dput(p->dir);
1399 dput(p->dentry);
1400 nfs_sb_deactive(sb);
1401 nfs_fattr_free_names(&p->f_attr);
1402 kfree(p->f_attr.mdsthreshold);
1403 kfree(p);
1404 }
1405
1406 static void nfs4_opendata_put(struct nfs4_opendata *p)
1407 {
1408 if (p != NULL)
1409 kref_put(&p->kref, nfs4_opendata_free);
1410 }
1411
1412 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1413 fmode_t fmode)
1414 {
1415 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1416 case FMODE_READ|FMODE_WRITE:
1417 return state->n_rdwr != 0;
1418 case FMODE_WRITE:
1419 return state->n_wronly != 0;
1420 case FMODE_READ:
1421 return state->n_rdonly != 0;
1422 }
1423 WARN_ON_ONCE(1);
1424 return false;
1425 }
1426
1427 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1428 int open_mode, enum open_claim_type4 claim)
1429 {
1430 int ret = 0;
1431
1432 if (open_mode & (O_EXCL|O_TRUNC))
1433 goto out;
1434 switch (claim) {
1435 case NFS4_OPEN_CLAIM_NULL:
1436 case NFS4_OPEN_CLAIM_FH:
1437 goto out;
1438 default:
1439 break;
1440 }
1441 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1442 case FMODE_READ:
1443 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1444 && state->n_rdonly != 0;
1445 break;
1446 case FMODE_WRITE:
1447 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1448 && state->n_wronly != 0;
1449 break;
1450 case FMODE_READ|FMODE_WRITE:
1451 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1452 && state->n_rdwr != 0;
1453 }
1454 out:
1455 return ret;
1456 }
1457
1458 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1459 enum open_claim_type4 claim)
1460 {
1461 if (delegation == NULL)
1462 return 0;
1463 if ((delegation->type & fmode) != fmode)
1464 return 0;
1465 switch (claim) {
1466 case NFS4_OPEN_CLAIM_NULL:
1467 case NFS4_OPEN_CLAIM_FH:
1468 break;
1469 case NFS4_OPEN_CLAIM_PREVIOUS:
1470 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1471 break;
1472 /* Fall through */
1473 default:
1474 return 0;
1475 }
1476 nfs_mark_delegation_referenced(delegation);
1477 return 1;
1478 }
1479
1480 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1481 {
1482 switch (fmode) {
1483 case FMODE_WRITE:
1484 state->n_wronly++;
1485 break;
1486 case FMODE_READ:
1487 state->n_rdonly++;
1488 break;
1489 case FMODE_READ|FMODE_WRITE:
1490 state->n_rdwr++;
1491 }
1492 nfs4_state_set_mode_locked(state, state->state | fmode);
1493 }
1494
1495 #ifdef CONFIG_NFS_V4_1
1496 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1497 {
1498 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1499 return true;
1500 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1501 return true;
1502 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1503 return true;
1504 return false;
1505 }
1506 #endif /* CONFIG_NFS_V4_1 */
1507
1508 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1509 {
1510 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1511 wake_up_all(&state->waitq);
1512 }
1513
1514 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state,
1515 const nfs4_stateid *stateid)
1516 {
1517 u32 state_seqid = be32_to_cpu(state->open_stateid.seqid);
1518 u32 stateid_seqid = be32_to_cpu(stateid->seqid);
1519
1520 if (stateid_seqid == state_seqid + 1U ||
1521 (stateid_seqid == 1U && state_seqid == 0xffffffffU))
1522 nfs_state_log_update_open_stateid(state);
1523 else
1524 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1525 }
1526
1527 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1528 {
1529 struct nfs_client *clp = state->owner->so_server->nfs_client;
1530 bool need_recover = false;
1531
1532 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1533 need_recover = true;
1534 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1535 need_recover = true;
1536 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1537 need_recover = true;
1538 if (need_recover)
1539 nfs4_state_mark_reclaim_nograce(clp, state);
1540 }
1541
1542 /*
1543 * Check for whether or not the caller may update the open stateid
1544 * to the value passed in by stateid.
1545 *
1546 * Note: This function relies heavily on the server implementing
1547 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1548 * correctly.
1549 * i.e. The stateid seqids have to be initialised to 1, and
1550 * are then incremented on every state transition.
1551 */
1552 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1553 const nfs4_stateid *stateid)
1554 {
1555 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 ||
1556 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1557 if (stateid->seqid == cpu_to_be32(1))
1558 nfs_state_log_update_open_stateid(state);
1559 else
1560 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1561 return true;
1562 }
1563
1564 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1565 nfs_state_log_out_of_order_open_stateid(state, stateid);
1566 return true;
1567 }
1568 return false;
1569 }
1570
1571 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1572 {
1573 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1574 return;
1575 if (state->n_wronly)
1576 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1577 if (state->n_rdonly)
1578 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1579 if (state->n_rdwr)
1580 set_bit(NFS_O_RDWR_STATE, &state->flags);
1581 set_bit(NFS_OPEN_STATE, &state->flags);
1582 }
1583
1584 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1585 nfs4_stateid *stateid, fmode_t fmode)
1586 {
1587 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1588 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1589 case FMODE_WRITE:
1590 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1591 break;
1592 case FMODE_READ:
1593 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1594 break;
1595 case 0:
1596 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1597 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1598 clear_bit(NFS_OPEN_STATE, &state->flags);
1599 }
1600 if (stateid == NULL)
1601 return;
1602 /* Handle OPEN+OPEN_DOWNGRADE races */
1603 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1604 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1605 nfs_resync_open_stateid_locked(state);
1606 goto out;
1607 }
1608 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1609 nfs4_stateid_copy(&state->stateid, stateid);
1610 nfs4_stateid_copy(&state->open_stateid, stateid);
1611 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1612 out:
1613 nfs_state_log_update_open_stateid(state);
1614 }
1615
1616 static void nfs_clear_open_stateid(struct nfs4_state *state,
1617 nfs4_stateid *arg_stateid,
1618 nfs4_stateid *stateid, fmode_t fmode)
1619 {
1620 write_seqlock(&state->seqlock);
1621 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1622 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1623 nfs_clear_open_stateid_locked(state, stateid, fmode);
1624 write_sequnlock(&state->seqlock);
1625 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1626 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1627 }
1628
1629 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1630 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1631 __must_hold(&state->owner->so_lock)
1632 __must_hold(&state->seqlock)
1633 __must_hold(RCU)
1634
1635 {
1636 DEFINE_WAIT(wait);
1637 int status = 0;
1638 for (;;) {
1639
1640 if (!nfs_need_update_open_stateid(state, stateid))
1641 return;
1642 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1643 break;
1644 if (status)
1645 break;
1646 /* Rely on seqids for serialisation with NFSv4.0 */
1647 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1648 break;
1649
1650 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1651 /*
1652 * Ensure we process the state changes in the same order
1653 * in which the server processed them by delaying the
1654 * update of the stateid until we are in sequence.
1655 */
1656 write_sequnlock(&state->seqlock);
1657 spin_unlock(&state->owner->so_lock);
1658 rcu_read_unlock();
1659 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1660 if (!signal_pending(current)) {
1661 if (schedule_timeout(5*HZ) == 0)
1662 status = -EAGAIN;
1663 else
1664 status = 0;
1665 } else
1666 status = -EINTR;
1667 finish_wait(&state->waitq, &wait);
1668 rcu_read_lock();
1669 spin_lock(&state->owner->so_lock);
1670 write_seqlock(&state->seqlock);
1671 }
1672
1673 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1674 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1675 nfs4_stateid_copy(freeme, &state->open_stateid);
1676 nfs_test_and_clear_all_open_stateid(state);
1677 }
1678
1679 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1680 nfs4_stateid_copy(&state->stateid, stateid);
1681 nfs4_stateid_copy(&state->open_stateid, stateid);
1682 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1683 nfs_state_log_update_open_stateid(state);
1684 }
1685
1686 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1687 const nfs4_stateid *open_stateid,
1688 fmode_t fmode,
1689 nfs4_stateid *freeme)
1690 {
1691 /*
1692 * Protect the call to nfs4_state_set_mode_locked and
1693 * serialise the stateid update
1694 */
1695 write_seqlock(&state->seqlock);
1696 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1697 switch (fmode) {
1698 case FMODE_READ:
1699 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1700 break;
1701 case FMODE_WRITE:
1702 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1703 break;
1704 case FMODE_READ|FMODE_WRITE:
1705 set_bit(NFS_O_RDWR_STATE, &state->flags);
1706 }
1707 set_bit(NFS_OPEN_STATE, &state->flags);
1708 write_sequnlock(&state->seqlock);
1709 }
1710
1711 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1712 {
1713 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1714 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1715 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1716 clear_bit(NFS_OPEN_STATE, &state->flags);
1717 }
1718
1719 static void nfs_state_set_delegation(struct nfs4_state *state,
1720 const nfs4_stateid *deleg_stateid,
1721 fmode_t fmode)
1722 {
1723 /*
1724 * Protect the call to nfs4_state_set_mode_locked and
1725 * serialise the stateid update
1726 */
1727 write_seqlock(&state->seqlock);
1728 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1729 set_bit(NFS_DELEGATED_STATE, &state->flags);
1730 write_sequnlock(&state->seqlock);
1731 }
1732
1733 static void nfs_state_clear_delegation(struct nfs4_state *state)
1734 {
1735 write_seqlock(&state->seqlock);
1736 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1737 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1738 write_sequnlock(&state->seqlock);
1739 }
1740
1741 int update_open_stateid(struct nfs4_state *state,
1742 const nfs4_stateid *open_stateid,
1743 const nfs4_stateid *delegation,
1744 fmode_t fmode)
1745 {
1746 struct nfs_server *server = NFS_SERVER(state->inode);
1747 struct nfs_client *clp = server->nfs_client;
1748 struct nfs_inode *nfsi = NFS_I(state->inode);
1749 struct nfs_delegation *deleg_cur;
1750 nfs4_stateid freeme = { };
1751 int ret = 0;
1752
1753 fmode &= (FMODE_READ|FMODE_WRITE);
1754
1755 rcu_read_lock();
1756 spin_lock(&state->owner->so_lock);
1757 if (open_stateid != NULL) {
1758 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1759 ret = 1;
1760 }
1761
1762 deleg_cur = nfs4_get_valid_delegation(state->inode);
1763 if (deleg_cur == NULL)
1764 goto no_delegation;
1765
1766 spin_lock(&deleg_cur->lock);
1767 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1768 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1769 (deleg_cur->type & fmode) != fmode)
1770 goto no_delegation_unlock;
1771
1772 if (delegation == NULL)
1773 delegation = &deleg_cur->stateid;
1774 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1775 goto no_delegation_unlock;
1776
1777 nfs_mark_delegation_referenced(deleg_cur);
1778 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1779 ret = 1;
1780 no_delegation_unlock:
1781 spin_unlock(&deleg_cur->lock);
1782 no_delegation:
1783 if (ret)
1784 update_open_stateflags(state, fmode);
1785 spin_unlock(&state->owner->so_lock);
1786 rcu_read_unlock();
1787
1788 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1789 nfs4_schedule_state_manager(clp);
1790 if (freeme.type != 0)
1791 nfs4_test_and_free_stateid(server, &freeme,
1792 state->owner->so_cred);
1793
1794 return ret;
1795 }
1796
1797 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1798 const nfs4_stateid *stateid)
1799 {
1800 struct nfs4_state *state = lsp->ls_state;
1801 bool ret = false;
1802
1803 spin_lock(&state->state_lock);
1804 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1805 goto out_noupdate;
1806 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1807 goto out_noupdate;
1808 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1809 ret = true;
1810 out_noupdate:
1811 spin_unlock(&state->state_lock);
1812 return ret;
1813 }
1814
1815 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1816 {
1817 struct nfs_delegation *delegation;
1818
1819 fmode &= FMODE_READ|FMODE_WRITE;
1820 rcu_read_lock();
1821 delegation = nfs4_get_valid_delegation(inode);
1822 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1823 rcu_read_unlock();
1824 return;
1825 }
1826 rcu_read_unlock();
1827 nfs4_inode_return_delegation(inode);
1828 }
1829
1830 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1831 {
1832 struct nfs4_state *state = opendata->state;
1833 struct nfs_delegation *delegation;
1834 int open_mode = opendata->o_arg.open_flags;
1835 fmode_t fmode = opendata->o_arg.fmode;
1836 enum open_claim_type4 claim = opendata->o_arg.claim;
1837 nfs4_stateid stateid;
1838 int ret = -EAGAIN;
1839
1840 for (;;) {
1841 spin_lock(&state->owner->so_lock);
1842 if (can_open_cached(state, fmode, open_mode, claim)) {
1843 update_open_stateflags(state, fmode);
1844 spin_unlock(&state->owner->so_lock);
1845 goto out_return_state;
1846 }
1847 spin_unlock(&state->owner->so_lock);
1848 rcu_read_lock();
1849 delegation = nfs4_get_valid_delegation(state->inode);
1850 if (!can_open_delegated(delegation, fmode, claim)) {
1851 rcu_read_unlock();
1852 break;
1853 }
1854 /* Save the delegation */
1855 nfs4_stateid_copy(&stateid, &delegation->stateid);
1856 rcu_read_unlock();
1857 nfs_release_seqid(opendata->o_arg.seqid);
1858 if (!opendata->is_recover) {
1859 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1860 if (ret != 0)
1861 goto out;
1862 }
1863 ret = -EAGAIN;
1864
1865 /* Try to update the stateid using the delegation */
1866 if (update_open_stateid(state, NULL, &stateid, fmode))
1867 goto out_return_state;
1868 }
1869 out:
1870 return ERR_PTR(ret);
1871 out_return_state:
1872 refcount_inc(&state->count);
1873 return state;
1874 }
1875
1876 static void
1877 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1878 {
1879 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1880 struct nfs_delegation *delegation;
1881 int delegation_flags = 0;
1882
1883 rcu_read_lock();
1884 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1885 if (delegation)
1886 delegation_flags = delegation->flags;
1887 rcu_read_unlock();
1888 switch (data->o_arg.claim) {
1889 default:
1890 break;
1891 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1892 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1893 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1894 "returning a delegation for "
1895 "OPEN(CLAIM_DELEGATE_CUR)\n",
1896 clp->cl_hostname);
1897 return;
1898 }
1899 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1900 nfs_inode_set_delegation(state->inode,
1901 data->owner->so_cred,
1902 data->o_res.delegation_type,
1903 &data->o_res.delegation,
1904 data->o_res.pagemod_limit);
1905 else
1906 nfs_inode_reclaim_delegation(state->inode,
1907 data->owner->so_cred,
1908 data->o_res.delegation_type,
1909 &data->o_res.delegation,
1910 data->o_res.pagemod_limit);
1911
1912 if (data->o_res.do_recall)
1913 nfs_async_inode_return_delegation(state->inode,
1914 &data->o_res.delegation);
1915 }
1916
1917 /*
1918 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1919 * and update the nfs4_state.
1920 */
1921 static struct nfs4_state *
1922 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1923 {
1924 struct inode *inode = data->state->inode;
1925 struct nfs4_state *state = data->state;
1926 int ret;
1927
1928 if (!data->rpc_done) {
1929 if (data->rpc_status)
1930 return ERR_PTR(data->rpc_status);
1931 /* cached opens have already been processed */
1932 goto update;
1933 }
1934
1935 ret = nfs_refresh_inode(inode, &data->f_attr);
1936 if (ret)
1937 return ERR_PTR(ret);
1938
1939 if (data->o_res.delegation_type != 0)
1940 nfs4_opendata_check_deleg(data, state);
1941 update:
1942 if (!update_open_stateid(state, &data->o_res.stateid,
1943 NULL, data->o_arg.fmode))
1944 return ERR_PTR(-EAGAIN);
1945 refcount_inc(&state->count);
1946
1947 return state;
1948 }
1949
1950 static struct inode *
1951 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1952 {
1953 struct inode *inode;
1954
1955 switch (data->o_arg.claim) {
1956 case NFS4_OPEN_CLAIM_NULL:
1957 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1958 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1959 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1960 return ERR_PTR(-EAGAIN);
1961 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
1962 &data->f_attr, data->f_label);
1963 break;
1964 default:
1965 inode = d_inode(data->dentry);
1966 ihold(inode);
1967 nfs_refresh_inode(inode, &data->f_attr);
1968 }
1969 return inode;
1970 }
1971
1972 static struct nfs4_state *
1973 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
1974 {
1975 struct nfs4_state *state;
1976 struct inode *inode;
1977
1978 inode = nfs4_opendata_get_inode(data);
1979 if (IS_ERR(inode))
1980 return ERR_CAST(inode);
1981 if (data->state != NULL && data->state->inode == inode) {
1982 state = data->state;
1983 refcount_inc(&state->count);
1984 } else
1985 state = nfs4_get_open_state(inode, data->owner);
1986 iput(inode);
1987 if (state == NULL)
1988 state = ERR_PTR(-ENOMEM);
1989 return state;
1990 }
1991
1992 static struct nfs4_state *
1993 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1994 {
1995 struct nfs4_state *state;
1996
1997 if (!data->rpc_done) {
1998 state = nfs4_try_open_cached(data);
1999 trace_nfs4_cached_open(data->state);
2000 goto out;
2001 }
2002
2003 state = nfs4_opendata_find_nfs4_state(data);
2004 if (IS_ERR(state))
2005 goto out;
2006
2007 if (data->o_res.delegation_type != 0)
2008 nfs4_opendata_check_deleg(data, state);
2009 if (!update_open_stateid(state, &data->o_res.stateid,
2010 NULL, data->o_arg.fmode)) {
2011 nfs4_put_open_state(state);
2012 state = ERR_PTR(-EAGAIN);
2013 }
2014 out:
2015 nfs_release_seqid(data->o_arg.seqid);
2016 return state;
2017 }
2018
2019 static struct nfs4_state *
2020 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2021 {
2022 struct nfs4_state *ret;
2023
2024 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2025 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2026 else
2027 ret = _nfs4_opendata_to_nfs4_state(data);
2028 nfs4_sequence_free_slot(&data->o_res.seq_res);
2029 return ret;
2030 }
2031
2032 static struct nfs_open_context *
2033 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2034 {
2035 struct nfs_inode *nfsi = NFS_I(state->inode);
2036 struct nfs_open_context *ctx;
2037
2038 rcu_read_lock();
2039 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2040 if (ctx->state != state)
2041 continue;
2042 if ((ctx->mode & mode) != mode)
2043 continue;
2044 if (!get_nfs_open_context(ctx))
2045 continue;
2046 rcu_read_unlock();
2047 return ctx;
2048 }
2049 rcu_read_unlock();
2050 return ERR_PTR(-ENOENT);
2051 }
2052
2053 static struct nfs_open_context *
2054 nfs4_state_find_open_context(struct nfs4_state *state)
2055 {
2056 struct nfs_open_context *ctx;
2057
2058 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2059 if (!IS_ERR(ctx))
2060 return ctx;
2061 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2062 if (!IS_ERR(ctx))
2063 return ctx;
2064 return nfs4_state_find_open_context_mode(state, FMODE_READ);
2065 }
2066
2067 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2068 struct nfs4_state *state, enum open_claim_type4 claim)
2069 {
2070 struct nfs4_opendata *opendata;
2071
2072 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2073 NULL, claim, GFP_NOFS);
2074 if (opendata == NULL)
2075 return ERR_PTR(-ENOMEM);
2076 opendata->state = state;
2077 refcount_inc(&state->count);
2078 return opendata;
2079 }
2080
2081 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2082 fmode_t fmode)
2083 {
2084 struct nfs4_state *newstate;
2085 int ret;
2086
2087 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2088 return 0;
2089 opendata->o_arg.open_flags = 0;
2090 opendata->o_arg.fmode = fmode;
2091 opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2092 NFS_SB(opendata->dentry->d_sb),
2093 fmode, 0);
2094 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2095 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2096 nfs4_init_opendata_res(opendata);
2097 ret = _nfs4_recover_proc_open(opendata);
2098 if (ret != 0)
2099 return ret;
2100 newstate = nfs4_opendata_to_nfs4_state(opendata);
2101 if (IS_ERR(newstate))
2102 return PTR_ERR(newstate);
2103 if (newstate != opendata->state)
2104 ret = -ESTALE;
2105 nfs4_close_state(newstate, fmode);
2106 return ret;
2107 }
2108
2109 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2110 {
2111 int ret;
2112
2113 /* memory barrier prior to reading state->n_* */
2114 smp_rmb();
2115 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2116 if (ret != 0)
2117 return ret;
2118 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2119 if (ret != 0)
2120 return ret;
2121 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2122 if (ret != 0)
2123 return ret;
2124 /*
2125 * We may have performed cached opens for all three recoveries.
2126 * Check if we need to update the current stateid.
2127 */
2128 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2129 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2130 write_seqlock(&state->seqlock);
2131 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2132 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2133 write_sequnlock(&state->seqlock);
2134 }
2135 return 0;
2136 }
2137
2138 /*
2139 * OPEN_RECLAIM:
2140 * reclaim state on the server after a reboot.
2141 */
2142 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2143 {
2144 struct nfs_delegation *delegation;
2145 struct nfs4_opendata *opendata;
2146 fmode_t delegation_type = 0;
2147 int status;
2148
2149 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2150 NFS4_OPEN_CLAIM_PREVIOUS);
2151 if (IS_ERR(opendata))
2152 return PTR_ERR(opendata);
2153 rcu_read_lock();
2154 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2155 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2156 delegation_type = delegation->type;
2157 rcu_read_unlock();
2158 opendata->o_arg.u.delegation_type = delegation_type;
2159 status = nfs4_open_recover(opendata, state);
2160 nfs4_opendata_put(opendata);
2161 return status;
2162 }
2163
2164 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2165 {
2166 struct nfs_server *server = NFS_SERVER(state->inode);
2167 struct nfs4_exception exception = { };
2168 int err;
2169 do {
2170 err = _nfs4_do_open_reclaim(ctx, state);
2171 trace_nfs4_open_reclaim(ctx, 0, err);
2172 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2173 continue;
2174 if (err != -NFS4ERR_DELAY)
2175 break;
2176 nfs4_handle_exception(server, err, &exception);
2177 } while (exception.retry);
2178 return err;
2179 }
2180
2181 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2182 {
2183 struct nfs_open_context *ctx;
2184 int ret;
2185
2186 ctx = nfs4_state_find_open_context(state);
2187 if (IS_ERR(ctx))
2188 return -EAGAIN;
2189 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2190 nfs_state_clear_open_state_flags(state);
2191 ret = nfs4_do_open_reclaim(ctx, state);
2192 put_nfs_open_context(ctx);
2193 return ret;
2194 }
2195
2196 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)
2197 {
2198 switch (err) {
2199 default:
2200 printk(KERN_ERR "NFS: %s: unhandled error "
2201 "%d.\n", __func__, err);
2202 case 0:
2203 case -ENOENT:
2204 case -EAGAIN:
2205 case -ESTALE:
2206 case -ETIMEDOUT:
2207 break;
2208 case -NFS4ERR_BADSESSION:
2209 case -NFS4ERR_BADSLOT:
2210 case -NFS4ERR_BAD_HIGH_SLOT:
2211 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2212 case -NFS4ERR_DEADSESSION:
2213 return -EAGAIN;
2214 case -NFS4ERR_STALE_CLIENTID:
2215 case -NFS4ERR_STALE_STATEID:
2216 /* Don't recall a delegation if it was lost */
2217 nfs4_schedule_lease_recovery(server->nfs_client);
2218 return -EAGAIN;
2219 case -NFS4ERR_MOVED:
2220 nfs4_schedule_migration_recovery(server);
2221 return -EAGAIN;
2222 case -NFS4ERR_LEASE_MOVED:
2223 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2224 return -EAGAIN;
2225 case -NFS4ERR_DELEG_REVOKED:
2226 case -NFS4ERR_ADMIN_REVOKED:
2227 case -NFS4ERR_EXPIRED:
2228 case -NFS4ERR_BAD_STATEID:
2229 case -NFS4ERR_OPENMODE:
2230 nfs_inode_find_state_and_recover(state->inode,
2231 stateid);
2232 nfs4_schedule_stateid_recovery(server, state);
2233 return -EAGAIN;
2234 case -NFS4ERR_DELAY:
2235 case -NFS4ERR_GRACE:
2236 ssleep(1);
2237 return -EAGAIN;
2238 case -ENOMEM:
2239 case -NFS4ERR_DENIED:
2240 if (fl) {
2241 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2242 if (lsp)
2243 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2244 }
2245 return 0;
2246 }
2247 return err;
2248 }
2249
2250 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2251 struct nfs4_state *state, const nfs4_stateid *stateid)
2252 {
2253 struct nfs_server *server = NFS_SERVER(state->inode);
2254 struct nfs4_opendata *opendata;
2255 int err = 0;
2256
2257 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2258 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2259 if (IS_ERR(opendata))
2260 return PTR_ERR(opendata);
2261 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2262 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2263 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2264 if (err)
2265 goto out;
2266 }
2267 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2268 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2269 if (err)
2270 goto out;
2271 }
2272 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2273 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2274 if (err)
2275 goto out;
2276 }
2277 nfs_state_clear_delegation(state);
2278 out:
2279 nfs4_opendata_put(opendata);
2280 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2281 }
2282
2283 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2284 {
2285 struct nfs4_opendata *data = calldata;
2286
2287 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2288 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2289 }
2290
2291 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2292 {
2293 struct nfs4_opendata *data = calldata;
2294
2295 nfs40_sequence_done(task, &data->c_res.seq_res);
2296
2297 data->rpc_status = task->tk_status;
2298 if (data->rpc_status == 0) {
2299 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2300 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2301 renew_lease(data->o_res.server, data->timestamp);
2302 data->rpc_done = true;
2303 }
2304 }
2305
2306 static void nfs4_open_confirm_release(void *calldata)
2307 {
2308 struct nfs4_opendata *data = calldata;
2309 struct nfs4_state *state = NULL;
2310
2311 /* If this request hasn't been cancelled, do nothing */
2312 if (!data->cancelled)
2313 goto out_free;
2314 /* In case of error, no cleanup! */
2315 if (!data->rpc_done)
2316 goto out_free;
2317 state = nfs4_opendata_to_nfs4_state(data);
2318 if (!IS_ERR(state))
2319 nfs4_close_state(state, data->o_arg.fmode);
2320 out_free:
2321 nfs4_opendata_put(data);
2322 }
2323
2324 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2325 .rpc_call_prepare = nfs4_open_confirm_prepare,
2326 .rpc_call_done = nfs4_open_confirm_done,
2327 .rpc_release = nfs4_open_confirm_release,
2328 };
2329
2330 /*
2331 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2332 */
2333 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2334 {
2335 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2336 struct rpc_task *task;
2337 struct rpc_message msg = {
2338 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2339 .rpc_argp = &data->c_arg,
2340 .rpc_resp = &data->c_res,
2341 .rpc_cred = data->owner->so_cred,
2342 };
2343 struct rpc_task_setup task_setup_data = {
2344 .rpc_client = server->client,
2345 .rpc_message = &msg,
2346 .callback_ops = &nfs4_open_confirm_ops,
2347 .callback_data = data,
2348 .workqueue = nfsiod_workqueue,
2349 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2350 };
2351 int status;
2352
2353 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2354 data->is_recover);
2355 kref_get(&data->kref);
2356 data->rpc_done = false;
2357 data->rpc_status = 0;
2358 data->timestamp = jiffies;
2359 task = rpc_run_task(&task_setup_data);
2360 if (IS_ERR(task))
2361 return PTR_ERR(task);
2362 status = rpc_wait_for_completion_task(task);
2363 if (status != 0) {
2364 data->cancelled = true;
2365 smp_wmb();
2366 } else
2367 status = data->rpc_status;
2368 rpc_put_task(task);
2369 return status;
2370 }
2371
2372 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2373 {
2374 struct nfs4_opendata *data = calldata;
2375 struct nfs4_state_owner *sp = data->owner;
2376 struct nfs_client *clp = sp->so_server->nfs_client;
2377 enum open_claim_type4 claim = data->o_arg.claim;
2378
2379 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2380 goto out_wait;
2381 /*
2382 * Check if we still need to send an OPEN call, or if we can use
2383 * a delegation instead.
2384 */
2385 if (data->state != NULL) {
2386 struct nfs_delegation *delegation;
2387
2388 if (can_open_cached(data->state, data->o_arg.fmode,
2389 data->o_arg.open_flags, claim))
2390 goto out_no_action;
2391 rcu_read_lock();
2392 delegation = nfs4_get_valid_delegation(data->state->inode);
2393 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2394 goto unlock_no_action;
2395 rcu_read_unlock();
2396 }
2397 /* Update client id. */
2398 data->o_arg.clientid = clp->cl_clientid;
2399 switch (claim) {
2400 default:
2401 break;
2402 case NFS4_OPEN_CLAIM_PREVIOUS:
2403 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2404 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2405 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2406 /* Fall through */
2407 case NFS4_OPEN_CLAIM_FH:
2408 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2409 }
2410 data->timestamp = jiffies;
2411 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2412 &data->o_arg.seq_args,
2413 &data->o_res.seq_res,
2414 task) != 0)
2415 nfs_release_seqid(data->o_arg.seqid);
2416
2417 /* Set the create mode (note dependency on the session type) */
2418 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2419 if (data->o_arg.open_flags & O_EXCL) {
2420 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2421 if (nfs4_has_persistent_session(clp))
2422 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2423 else if (clp->cl_mvops->minor_version > 0)
2424 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2425 }
2426 return;
2427 unlock_no_action:
2428 trace_nfs4_cached_open(data->state);
2429 rcu_read_unlock();
2430 out_no_action:
2431 task->tk_action = NULL;
2432 out_wait:
2433 nfs4_sequence_done(task, &data->o_res.seq_res);
2434 }
2435
2436 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2437 {
2438 struct nfs4_opendata *data = calldata;
2439
2440 data->rpc_status = task->tk_status;
2441
2442 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2443 return;
2444
2445 if (task->tk_status == 0) {
2446 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2447 switch (data->o_res.f_attr->mode & S_IFMT) {
2448 case S_IFREG:
2449 break;
2450 case S_IFLNK:
2451 data->rpc_status = -ELOOP;
2452 break;
2453 case S_IFDIR:
2454 data->rpc_status = -EISDIR;
2455 break;
2456 default:
2457 data->rpc_status = -ENOTDIR;
2458 }
2459 }
2460 renew_lease(data->o_res.server, data->timestamp);
2461 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2462 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2463 }
2464 data->rpc_done = true;
2465 }
2466
2467 static void nfs4_open_release(void *calldata)
2468 {
2469 struct nfs4_opendata *data = calldata;
2470 struct nfs4_state *state = NULL;
2471
2472 /* If this request hasn't been cancelled, do nothing */
2473 if (!data->cancelled)
2474 goto out_free;
2475 /* In case of error, no cleanup! */
2476 if (data->rpc_status != 0 || !data->rpc_done)
2477 goto out_free;
2478 /* In case we need an open_confirm, no cleanup! */
2479 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2480 goto out_free;
2481 state = nfs4_opendata_to_nfs4_state(data);
2482 if (!IS_ERR(state))
2483 nfs4_close_state(state, data->o_arg.fmode);
2484 out_free:
2485 nfs4_opendata_put(data);
2486 }
2487
2488 static const struct rpc_call_ops nfs4_open_ops = {
2489 .rpc_call_prepare = nfs4_open_prepare,
2490 .rpc_call_done = nfs4_open_done,
2491 .rpc_release = nfs4_open_release,
2492 };
2493
2494 static int nfs4_run_open_task(struct nfs4_opendata *data,
2495 struct nfs_open_context *ctx)
2496 {
2497 struct inode *dir = d_inode(data->dir);
2498 struct nfs_server *server = NFS_SERVER(dir);
2499 struct nfs_openargs *o_arg = &data->o_arg;
2500 struct nfs_openres *o_res = &data->o_res;
2501 struct rpc_task *task;
2502 struct rpc_message msg = {
2503 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2504 .rpc_argp = o_arg,
2505 .rpc_resp = o_res,
2506 .rpc_cred = data->owner->so_cred,
2507 };
2508 struct rpc_task_setup task_setup_data = {
2509 .rpc_client = server->client,
2510 .rpc_message = &msg,
2511 .callback_ops = &nfs4_open_ops,
2512 .callback_data = data,
2513 .workqueue = nfsiod_workqueue,
2514 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2515 };
2516 int status;
2517
2518 kref_get(&data->kref);
2519 data->rpc_done = false;
2520 data->rpc_status = 0;
2521 data->cancelled = false;
2522 data->is_recover = false;
2523 if (!ctx) {
2524 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2525 data->is_recover = true;
2526 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2527 } else {
2528 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2529 pnfs_lgopen_prepare(data, ctx);
2530 }
2531 task = rpc_run_task(&task_setup_data);
2532 if (IS_ERR(task))
2533 return PTR_ERR(task);
2534 status = rpc_wait_for_completion_task(task);
2535 if (status != 0) {
2536 data->cancelled = true;
2537 smp_wmb();
2538 } else
2539 status = data->rpc_status;
2540 rpc_put_task(task);
2541
2542 return status;
2543 }
2544
2545 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2546 {
2547 struct inode *dir = d_inode(data->dir);
2548 struct nfs_openres *o_res = &data->o_res;
2549 int status;
2550
2551 status = nfs4_run_open_task(data, NULL);
2552 if (status != 0 || !data->rpc_done)
2553 return status;
2554
2555 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2556
2557 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2558 status = _nfs4_proc_open_confirm(data);
2559
2560 return status;
2561 }
2562
2563 /*
2564 * Additional permission checks in order to distinguish between an
2565 * open for read, and an open for execute. This works around the
2566 * fact that NFSv4 OPEN treats read and execute permissions as being
2567 * the same.
2568 * Note that in the non-execute case, we want to turn off permission
2569 * checking if we just created a new file (POSIX open() semantics).
2570 */
2571 static int nfs4_opendata_access(const struct cred *cred,
2572 struct nfs4_opendata *opendata,
2573 struct nfs4_state *state, fmode_t fmode,
2574 int openflags)
2575 {
2576 struct nfs_access_entry cache;
2577 u32 mask, flags;
2578
2579 /* access call failed or for some reason the server doesn't
2580 * support any access modes -- defer access call until later */
2581 if (opendata->o_res.access_supported == 0)
2582 return 0;
2583
2584 mask = 0;
2585 /*
2586 * Use openflags to check for exec, because fmode won't
2587 * always have FMODE_EXEC set when file open for exec.
2588 */
2589 if (openflags & __FMODE_EXEC) {
2590 /* ONLY check for exec rights */
2591 if (S_ISDIR(state->inode->i_mode))
2592 mask = NFS4_ACCESS_LOOKUP;
2593 else
2594 mask = NFS4_ACCESS_EXECUTE;
2595 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2596 mask = NFS4_ACCESS_READ;
2597
2598 cache.cred = cred;
2599 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2600 nfs_access_add_cache(state->inode, &cache);
2601
2602 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2603 if ((mask & ~cache.mask & flags) == 0)
2604 return 0;
2605
2606 return -EACCES;
2607 }
2608
2609 /*
2610 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2611 */
2612 static int _nfs4_proc_open(struct nfs4_opendata *data,
2613 struct nfs_open_context *ctx)
2614 {
2615 struct inode *dir = d_inode(data->dir);
2616 struct nfs_server *server = NFS_SERVER(dir);
2617 struct nfs_openargs *o_arg = &data->o_arg;
2618 struct nfs_openres *o_res = &data->o_res;
2619 int status;
2620
2621 status = nfs4_run_open_task(data, ctx);
2622 if (!data->rpc_done)
2623 return status;
2624 if (status != 0) {
2625 if (status == -NFS4ERR_BADNAME &&
2626 !(o_arg->open_flags & O_CREAT))
2627 return -ENOENT;
2628 return status;
2629 }
2630
2631 nfs_fattr_map_and_free_names(server, &data->f_attr);
2632
2633 if (o_arg->open_flags & O_CREAT) {
2634 if (o_arg->open_flags & O_EXCL)
2635 data->file_created = true;
2636 else if (o_res->cinfo.before != o_res->cinfo.after)
2637 data->file_created = true;
2638 if (data->file_created ||
2639 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2640 update_changeattr(dir, &o_res->cinfo,
2641 o_res->f_attr->time_start, 0);
2642 }
2643 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2644 server->caps &= ~NFS_CAP_POSIX_LOCK;
2645 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2646 status = _nfs4_proc_open_confirm(data);
2647 if (status != 0)
2648 return status;
2649 }
2650 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2651 nfs4_sequence_free_slot(&o_res->seq_res);
2652 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr,
2653 o_res->f_label, NULL);
2654 }
2655 return 0;
2656 }
2657
2658 /*
2659 * OPEN_EXPIRED:
2660 * reclaim state on the server after a network partition.
2661 * Assumes caller holds the appropriate lock
2662 */
2663 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2664 {
2665 struct nfs4_opendata *opendata;
2666 int ret;
2667
2668 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2669 NFS4_OPEN_CLAIM_FH);
2670 if (IS_ERR(opendata))
2671 return PTR_ERR(opendata);
2672 ret = nfs4_open_recover(opendata, state);
2673 if (ret == -ESTALE)
2674 d_drop(ctx->dentry);
2675 nfs4_opendata_put(opendata);
2676 return ret;
2677 }
2678
2679 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2680 {
2681 struct nfs_server *server = NFS_SERVER(state->inode);
2682 struct nfs4_exception exception = { };
2683 int err;
2684
2685 do {
2686 err = _nfs4_open_expired(ctx, state);
2687 trace_nfs4_open_expired(ctx, 0, err);
2688 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2689 continue;
2690 switch (err) {
2691 default:
2692 goto out;
2693 case -NFS4ERR_GRACE:
2694 case -NFS4ERR_DELAY:
2695 nfs4_handle_exception(server, err, &exception);
2696 err = 0;
2697 }
2698 } while (exception.retry);
2699 out:
2700 return err;
2701 }
2702
2703 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2704 {
2705 struct nfs_open_context *ctx;
2706 int ret;
2707
2708 ctx = nfs4_state_find_open_context(state);
2709 if (IS_ERR(ctx))
2710 return -EAGAIN;
2711 ret = nfs4_do_open_expired(ctx, state);
2712 put_nfs_open_context(ctx);
2713 return ret;
2714 }
2715
2716 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2717 const nfs4_stateid *stateid)
2718 {
2719 nfs_remove_bad_delegation(state->inode, stateid);
2720 nfs_state_clear_delegation(state);
2721 }
2722
2723 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2724 {
2725 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2726 nfs_finish_clear_delegation_stateid(state, NULL);
2727 }
2728
2729 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2730 {
2731 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2732 nfs40_clear_delegation_stateid(state);
2733 nfs_state_clear_open_state_flags(state);
2734 return nfs4_open_expired(sp, state);
2735 }
2736
2737 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2738 nfs4_stateid *stateid,
2739 const struct cred *cred)
2740 {
2741 return -NFS4ERR_BAD_STATEID;
2742 }
2743
2744 #if defined(CONFIG_NFS_V4_1)
2745 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2746 nfs4_stateid *stateid,
2747 const struct cred *cred)
2748 {
2749 int status;
2750
2751 switch (stateid->type) {
2752 default:
2753 break;
2754 case NFS4_INVALID_STATEID_TYPE:
2755 case NFS4_SPECIAL_STATEID_TYPE:
2756 return -NFS4ERR_BAD_STATEID;
2757 case NFS4_REVOKED_STATEID_TYPE:
2758 goto out_free;
2759 }
2760
2761 status = nfs41_test_stateid(server, stateid, cred);
2762 switch (status) {
2763 case -NFS4ERR_EXPIRED:
2764 case -NFS4ERR_ADMIN_REVOKED:
2765 case -NFS4ERR_DELEG_REVOKED:
2766 break;
2767 default:
2768 return status;
2769 }
2770 out_free:
2771 /* Ack the revoked state to the server */
2772 nfs41_free_stateid(server, stateid, cred, true);
2773 return -NFS4ERR_EXPIRED;
2774 }
2775
2776 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2777 {
2778 struct nfs_server *server = NFS_SERVER(state->inode);
2779 nfs4_stateid stateid;
2780 struct nfs_delegation *delegation;
2781 const struct cred *cred = NULL;
2782 int status, ret = NFS_OK;
2783
2784 /* Get the delegation credential for use by test/free_stateid */
2785 rcu_read_lock();
2786 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2787 if (delegation == NULL) {
2788 rcu_read_unlock();
2789 nfs_state_clear_delegation(state);
2790 return NFS_OK;
2791 }
2792
2793 spin_lock(&delegation->lock);
2794 nfs4_stateid_copy(&stateid, &delegation->stateid);
2795
2796 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2797 &delegation->flags)) {
2798 spin_unlock(&delegation->lock);
2799 rcu_read_unlock();
2800 return NFS_OK;
2801 }
2802
2803 if (delegation->cred)
2804 cred = get_cred(delegation->cred);
2805 spin_unlock(&delegation->lock);
2806 rcu_read_unlock();
2807 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2808 trace_nfs4_test_delegation_stateid(state, NULL, status);
2809 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2810 nfs_finish_clear_delegation_stateid(state, &stateid);
2811 else
2812 ret = status;
2813
2814 put_cred(cred);
2815 return ret;
2816 }
2817
2818 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2819 {
2820 nfs4_stateid tmp;
2821
2822 if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2823 nfs4_copy_delegation_stateid(state->inode, state->state,
2824 &tmp, NULL) &&
2825 nfs4_stateid_match_other(&state->stateid, &tmp))
2826 nfs_state_set_delegation(state, &tmp, state->state);
2827 else
2828 nfs_state_clear_delegation(state);
2829 }
2830
2831 /**
2832 * nfs41_check_expired_locks - possibly free a lock stateid
2833 *
2834 * @state: NFSv4 state for an inode
2835 *
2836 * Returns NFS_OK if recovery for this stateid is now finished.
2837 * Otherwise a negative NFS4ERR value is returned.
2838 */
2839 static int nfs41_check_expired_locks(struct nfs4_state *state)
2840 {
2841 int status, ret = NFS_OK;
2842 struct nfs4_lock_state *lsp, *prev = NULL;
2843 struct nfs_server *server = NFS_SERVER(state->inode);
2844
2845 if (!test_bit(LK_STATE_IN_USE, &state->flags))
2846 goto out;
2847
2848 spin_lock(&state->state_lock);
2849 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2850 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2851 const struct cred *cred = lsp->ls_state->owner->so_cred;
2852
2853 refcount_inc(&lsp->ls_count);
2854 spin_unlock(&state->state_lock);
2855
2856 nfs4_put_lock_state(prev);
2857 prev = lsp;
2858
2859 status = nfs41_test_and_free_expired_stateid(server,
2860 &lsp->ls_stateid,
2861 cred);
2862 trace_nfs4_test_lock_stateid(state, lsp, status);
2863 if (status == -NFS4ERR_EXPIRED ||
2864 status == -NFS4ERR_BAD_STATEID) {
2865 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2866 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2867 if (!recover_lost_locks)
2868 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2869 } else if (status != NFS_OK) {
2870 ret = status;
2871 nfs4_put_lock_state(prev);
2872 goto out;
2873 }
2874 spin_lock(&state->state_lock);
2875 }
2876 }
2877 spin_unlock(&state->state_lock);
2878 nfs4_put_lock_state(prev);
2879 out:
2880 return ret;
2881 }
2882
2883 /**
2884 * nfs41_check_open_stateid - possibly free an open stateid
2885 *
2886 * @state: NFSv4 state for an inode
2887 *
2888 * Returns NFS_OK if recovery for this stateid is now finished.
2889 * Otherwise a negative NFS4ERR value is returned.
2890 */
2891 static int nfs41_check_open_stateid(struct nfs4_state *state)
2892 {
2893 struct nfs_server *server = NFS_SERVER(state->inode);
2894 nfs4_stateid *stateid = &state->open_stateid;
2895 const struct cred *cred = state->owner->so_cred;
2896 int status;
2897
2898 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2899 return -NFS4ERR_BAD_STATEID;
2900 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2901 trace_nfs4_test_open_stateid(state, NULL, status);
2902 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2903 nfs_state_clear_open_state_flags(state);
2904 stateid->type = NFS4_INVALID_STATEID_TYPE;
2905 return status;
2906 }
2907 if (nfs_open_stateid_recover_openmode(state))
2908 return -NFS4ERR_OPENMODE;
2909 return NFS_OK;
2910 }
2911
2912 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2913 {
2914 int status;
2915
2916 status = nfs41_check_delegation_stateid(state);
2917 if (status != NFS_OK)
2918 return status;
2919 nfs41_delegation_recover_stateid(state);
2920
2921 status = nfs41_check_expired_locks(state);
2922 if (status != NFS_OK)
2923 return status;
2924 status = nfs41_check_open_stateid(state);
2925 if (status != NFS_OK)
2926 status = nfs4_open_expired(sp, state);
2927 return status;
2928 }
2929 #endif
2930
2931 /*
2932 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2933 * fields corresponding to attributes that were used to store the verifier.
2934 * Make sure we clobber those fields in the later setattr call
2935 */
2936 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2937 struct iattr *sattr, struct nfs4_label **label)
2938 {
2939 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2940 __u32 attrset[3];
2941 unsigned ret;
2942 unsigned i;
2943
2944 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2945 attrset[i] = opendata->o_res.attrset[i];
2946 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
2947 attrset[i] &= ~bitmask[i];
2948 }
2949
2950 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
2951 sattr->ia_valid : 0;
2952
2953 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
2954 if (sattr->ia_valid & ATTR_ATIME_SET)
2955 ret |= ATTR_ATIME_SET;
2956 else
2957 ret |= ATTR_ATIME;
2958 }
2959
2960 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
2961 if (sattr->ia_valid & ATTR_MTIME_SET)
2962 ret |= ATTR_MTIME_SET;
2963 else
2964 ret |= ATTR_MTIME;
2965 }
2966
2967 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
2968 *label = NULL;
2969 return ret;
2970 }
2971
2972 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2973 int flags, struct nfs_open_context *ctx)
2974 {
2975 struct nfs4_state_owner *sp = opendata->owner;
2976 struct nfs_server *server = sp->so_server;
2977 struct dentry *dentry;
2978 struct nfs4_state *state;
2979 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
2980 struct inode *dir = d_inode(opendata->dir);
2981 unsigned long dir_verifier;
2982 unsigned int seq;
2983 int ret;
2984
2985 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2986 dir_verifier = nfs_save_change_attribute(dir);
2987
2988 ret = _nfs4_proc_open(opendata, ctx);
2989 if (ret != 0)
2990 goto out;
2991
2992 state = _nfs4_opendata_to_nfs4_state(opendata);
2993 ret = PTR_ERR(state);
2994 if (IS_ERR(state))
2995 goto out;
2996 ctx->state = state;
2997 if (server->caps & NFS_CAP_POSIX_LOCK)
2998 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2999 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3000 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3001
3002 dentry = opendata->dentry;
3003 if (d_really_is_negative(dentry)) {
3004 struct dentry *alias;
3005 d_drop(dentry);
3006 alias = d_exact_alias(dentry, state->inode);
3007 if (!alias)
3008 alias = d_splice_alias(igrab(state->inode), dentry);
3009 /* d_splice_alias() can't fail here - it's a non-directory */
3010 if (alias) {
3011 dput(ctx->dentry);
3012 ctx->dentry = dentry = alias;
3013 }
3014 }
3015
3016 switch(opendata->o_arg.claim) {
3017 default:
3018 break;
3019 case NFS4_OPEN_CLAIM_NULL:
3020 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3021 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3022 if (!opendata->rpc_done)
3023 break;
3024 if (opendata->o_res.delegation_type != 0)
3025 dir_verifier = nfs_save_change_attribute(dir);
3026 nfs_set_verifier(dentry, dir_verifier);
3027 }
3028
3029 /* Parse layoutget results before we check for access */
3030 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3031
3032 ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3033 acc_mode, flags);
3034 if (ret != 0)
3035 goto out;
3036
3037 if (d_inode(dentry) == state->inode) {
3038 nfs_inode_attach_open_context(ctx);
3039 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3040 nfs4_schedule_stateid_recovery(server, state);
3041 }
3042
3043 out:
3044 if (!opendata->cancelled)
3045 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3046 return ret;
3047 }
3048
3049 /*
3050 * Returns a referenced nfs4_state
3051 */
3052 static int _nfs4_do_open(struct inode *dir,
3053 struct nfs_open_context *ctx,
3054 int flags,
3055 const struct nfs4_open_createattrs *c,
3056 int *opened)
3057 {
3058 struct nfs4_state_owner *sp;
3059 struct nfs4_state *state = NULL;
3060 struct nfs_server *server = NFS_SERVER(dir);
3061 struct nfs4_opendata *opendata;
3062 struct dentry *dentry = ctx->dentry;
3063 const struct cred *cred = ctx->cred;
3064 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3065 fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3066 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3067 struct iattr *sattr = c->sattr;
3068 struct nfs4_label *label = c->label;
3069 struct nfs4_label *olabel = NULL;
3070 int status;
3071
3072 /* Protect against reboot recovery conflicts */
3073 status = -ENOMEM;
3074 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3075 if (sp == NULL) {
3076 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3077 goto out_err;
3078 }
3079 status = nfs4_client_recover_expired_lease(server->nfs_client);
3080 if (status != 0)
3081 goto err_put_state_owner;
3082 if (d_really_is_positive(dentry))
3083 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3084 status = -ENOMEM;
3085 if (d_really_is_positive(dentry))
3086 claim = NFS4_OPEN_CLAIM_FH;
3087 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3088 c, claim, GFP_KERNEL);
3089 if (opendata == NULL)
3090 goto err_put_state_owner;
3091
3092 if (label) {
3093 olabel = nfs4_label_alloc(server, GFP_KERNEL);
3094 if (IS_ERR(olabel)) {
3095 status = PTR_ERR(olabel);
3096 goto err_opendata_put;
3097 }
3098 }
3099
3100 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3101 if (!opendata->f_attr.mdsthreshold) {
3102 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3103 if (!opendata->f_attr.mdsthreshold)
3104 goto err_free_label;
3105 }
3106 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3107 }
3108 if (d_really_is_positive(dentry))
3109 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3110
3111 status = _nfs4_open_and_get_state(opendata, flags, ctx);
3112 if (status != 0)
3113 goto err_free_label;
3114 state = ctx->state;
3115
3116 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3117 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3118 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3119 /*
3120 * send create attributes which was not set by open
3121 * with an extra setattr.
3122 */
3123 if (attrs || label) {
3124 unsigned ia_old = sattr->ia_valid;
3125
3126 sattr->ia_valid = attrs;
3127 nfs_fattr_init(opendata->o_res.f_attr);
3128 status = nfs4_do_setattr(state->inode, cred,
3129 opendata->o_res.f_attr, sattr,
3130 ctx, label, olabel);
3131 if (status == 0) {
3132 nfs_setattr_update_inode(state->inode, sattr,
3133 opendata->o_res.f_attr);
3134 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
3135 }
3136 sattr->ia_valid = ia_old;
3137 }
3138 }
3139 if (opened && opendata->file_created)
3140 *opened = 1;
3141
3142 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3143 *ctx_th = opendata->f_attr.mdsthreshold;
3144 opendata->f_attr.mdsthreshold = NULL;
3145 }
3146
3147 nfs4_label_free(olabel);
3148
3149 nfs4_opendata_put(opendata);
3150 nfs4_put_state_owner(sp);
3151 return 0;
3152 err_free_label:
3153 nfs4_label_free(olabel);
3154 err_opendata_put:
3155 nfs4_opendata_put(opendata);
3156 err_put_state_owner:
3157 nfs4_put_state_owner(sp);
3158 out_err:
3159 return status;
3160 }
3161
3162
3163 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3164 struct nfs_open_context *ctx,
3165 int flags,
3166 struct iattr *sattr,
3167 struct nfs4_label *label,
3168 int *opened)
3169 {
3170 struct nfs_server *server = NFS_SERVER(dir);
3171 struct nfs4_exception exception = {
3172 .interruptible = true,
3173 };
3174 struct nfs4_state *res;
3175 struct nfs4_open_createattrs c = {
3176 .label = label,
3177 .sattr = sattr,
3178 .verf = {
3179 [0] = (__u32)jiffies,
3180 [1] = (__u32)current->pid,
3181 },
3182 };
3183 int status;
3184
3185 do {
3186 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3187 res = ctx->state;
3188 trace_nfs4_open_file(ctx, flags, status);
3189 if (status == 0)
3190 break;
3191 /* NOTE: BAD_SEQID means the server and client disagree about the
3192 * book-keeping w.r.t. state-changing operations
3193 * (OPEN/CLOSE/LOCK/LOCKU...)
3194 * It is actually a sign of a bug on the client or on the server.
3195 *
3196 * If we receive a BAD_SEQID error in the particular case of
3197 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3198 * have unhashed the old state_owner for us, and that we can
3199 * therefore safely retry using a new one. We should still warn
3200 * the user though...
3201 */
3202 if (status == -NFS4ERR_BAD_SEQID) {
3203 pr_warn_ratelimited("NFS: v4 server %s "
3204 " returned a bad sequence-id error!\n",
3205 NFS_SERVER(dir)->nfs_client->cl_hostname);
3206 exception.retry = 1;
3207 continue;
3208 }
3209 /*
3210 * BAD_STATEID on OPEN means that the server cancelled our
3211 * state before it received the OPEN_CONFIRM.
3212 * Recover by retrying the request as per the discussion
3213 * on Page 181 of RFC3530.
3214 */
3215 if (status == -NFS4ERR_BAD_STATEID) {
3216 exception.retry = 1;
3217 continue;
3218 }
3219 if (status == -NFS4ERR_EXPIRED) {
3220 nfs4_schedule_lease_recovery(server->nfs_client);
3221 exception.retry = 1;
3222 continue;
3223 }
3224 if (status == -EAGAIN) {
3225 /* We must have found a delegation */
3226 exception.retry = 1;
3227 continue;
3228 }
3229 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3230 continue;
3231 res = ERR_PTR(nfs4_handle_exception(server,
3232 status, &exception));
3233 } while (exception.retry);
3234 return res;
3235 }
3236
3237 static int _nfs4_do_setattr(struct inode *inode,
3238 struct nfs_setattrargs *arg,
3239 struct nfs_setattrres *res,
3240 const struct cred *cred,
3241 struct nfs_open_context *ctx)
3242 {
3243 struct nfs_server *server = NFS_SERVER(inode);
3244 struct rpc_message msg = {
3245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3246 .rpc_argp = arg,
3247 .rpc_resp = res,
3248 .rpc_cred = cred,
3249 };
3250 const struct cred *delegation_cred = NULL;
3251 unsigned long timestamp = jiffies;
3252 bool truncate;
3253 int status;
3254
3255 nfs_fattr_init(res->fattr);
3256
3257 /* Servers should only apply open mode checks for file size changes */
3258 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3259 if (!truncate)
3260 goto zero_stateid;
3261
3262 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3263 /* Use that stateid */
3264 } else if (ctx != NULL && ctx->state) {
3265 struct nfs_lock_context *l_ctx;
3266 if (!nfs4_valid_open_stateid(ctx->state))
3267 return -EBADF;
3268 l_ctx = nfs_get_lock_context(ctx);
3269 if (IS_ERR(l_ctx))
3270 return PTR_ERR(l_ctx);
3271 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3272 &arg->stateid, &delegation_cred);
3273 nfs_put_lock_context(l_ctx);
3274 if (status == -EIO)
3275 return -EBADF;
3276 else if (status == -EAGAIN)
3277 goto zero_stateid;
3278 } else {
3279 zero_stateid:
3280 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3281 }
3282 if (delegation_cred)
3283 msg.rpc_cred = delegation_cred;
3284
3285 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3286
3287 put_cred(delegation_cred);
3288 if (status == 0 && ctx != NULL)
3289 renew_lease(server, timestamp);
3290 trace_nfs4_setattr(inode, &arg->stateid, status);
3291 return status;
3292 }
3293
3294 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3295 struct nfs_fattr *fattr, struct iattr *sattr,
3296 struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3297 struct nfs4_label *olabel)
3298 {
3299 struct nfs_server *server = NFS_SERVER(inode);
3300 __u32 bitmask[NFS4_BITMASK_SZ];
3301 struct nfs4_state *state = ctx ? ctx->state : NULL;
3302 struct nfs_setattrargs arg = {
3303 .fh = NFS_FH(inode),
3304 .iap = sattr,
3305 .server = server,
3306 .bitmask = bitmask,
3307 .label = ilabel,
3308 };
3309 struct nfs_setattrres res = {
3310 .fattr = fattr,
3311 .label = olabel,
3312 .server = server,
3313 };
3314 struct nfs4_exception exception = {
3315 .state = state,
3316 .inode = inode,
3317 .stateid = &arg.stateid,
3318 };
3319 int err;
3320
3321 do {
3322 nfs4_bitmap_copy_adjust_setattr(bitmask,
3323 nfs4_bitmask(server, olabel),
3324 inode);
3325
3326 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3327 switch (err) {
3328 case -NFS4ERR_OPENMODE:
3329 if (!(sattr->ia_valid & ATTR_SIZE)) {
3330 pr_warn_once("NFSv4: server %s is incorrectly "
3331 "applying open mode checks to "
3332 "a SETATTR that is not "
3333 "changing file size.\n",
3334 server->nfs_client->cl_hostname);
3335 }
3336 if (state && !(state->state & FMODE_WRITE)) {
3337 err = -EBADF;
3338 if (sattr->ia_valid & ATTR_OPEN)
3339 err = -EACCES;
3340 goto out;
3341 }
3342 }
3343 err = nfs4_handle_exception(server, err, &exception);
3344 } while (exception.retry);
3345 out:
3346 return err;
3347 }
3348
3349 static bool
3350 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3351 {
3352 if (inode == NULL || !nfs_have_layout(inode))
3353 return false;
3354
3355 return pnfs_wait_on_layoutreturn(inode, task);
3356 }
3357
3358 /*
3359 * Update the seqid of an open stateid
3360 */
3361 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3362 struct nfs4_state *state)
3363 {
3364 __be32 seqid_open;
3365 u32 dst_seqid;
3366 int seq;
3367
3368 for (;;) {
3369 if (!nfs4_valid_open_stateid(state))
3370 break;
3371 seq = read_seqbegin(&state->seqlock);
3372 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3373 nfs4_stateid_copy(dst, &state->open_stateid);
3374 if (read_seqretry(&state->seqlock, seq))
3375 continue;
3376 break;
3377 }
3378 seqid_open = state->open_stateid.seqid;
3379 if (read_seqretry(&state->seqlock, seq))
3380 continue;
3381
3382 dst_seqid = be32_to_cpu(dst->seqid);
3383 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3384 dst->seqid = seqid_open;
3385 break;
3386 }
3387 }
3388
3389 /*
3390 * Update the seqid of an open stateid after receiving
3391 * NFS4ERR_OLD_STATEID
3392 */
3393 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3394 struct nfs4_state *state)
3395 {
3396 __be32 seqid_open;
3397 u32 dst_seqid;
3398 bool ret;
3399 int seq;
3400
3401 for (;;) {
3402 ret = false;
3403 if (!nfs4_valid_open_stateid(state))
3404 break;
3405 seq = read_seqbegin(&state->seqlock);
3406 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3407 if (read_seqretry(&state->seqlock, seq))
3408 continue;
3409 break;
3410 }
3411 seqid_open = state->open_stateid.seqid;
3412 if (read_seqretry(&state->seqlock, seq))
3413 continue;
3414
3415 dst_seqid = be32_to_cpu(dst->seqid);
3416 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) >= 0)
3417 dst->seqid = cpu_to_be32(dst_seqid + 1);
3418 else
3419 dst->seqid = seqid_open;
3420 ret = true;
3421 break;
3422 }
3423
3424 return ret;
3425 }
3426
3427 struct nfs4_closedata {
3428 struct inode *inode;
3429 struct nfs4_state *state;
3430 struct nfs_closeargs arg;
3431 struct nfs_closeres res;
3432 struct {
3433 struct nfs4_layoutreturn_args arg;
3434 struct nfs4_layoutreturn_res res;
3435 struct nfs4_xdr_opaque_data ld_private;
3436 u32 roc_barrier;
3437 bool roc;
3438 } lr;
3439 struct nfs_fattr fattr;
3440 unsigned long timestamp;
3441 };
3442
3443 static void nfs4_free_closedata(void *data)
3444 {
3445 struct nfs4_closedata *calldata = data;
3446 struct nfs4_state_owner *sp = calldata->state->owner;
3447 struct super_block *sb = calldata->state->inode->i_sb;
3448
3449 if (calldata->lr.roc)
3450 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3451 calldata->res.lr_ret);
3452 nfs4_put_open_state(calldata->state);
3453 nfs_free_seqid(calldata->arg.seqid);
3454 nfs4_put_state_owner(sp);
3455 nfs_sb_deactive(sb);
3456 kfree(calldata);
3457 }
3458
3459 static void nfs4_close_done(struct rpc_task *task, void *data)
3460 {
3461 struct nfs4_closedata *calldata = data;
3462 struct nfs4_state *state = calldata->state;
3463 struct nfs_server *server = NFS_SERVER(calldata->inode);
3464 nfs4_stateid *res_stateid = NULL;
3465 struct nfs4_exception exception = {
3466 .state = state,
3467 .inode = calldata->inode,
3468 .stateid = &calldata->arg.stateid,
3469 };
3470
3471 dprintk("%s: begin!\n", __func__);
3472 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3473 return;
3474 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3475
3476 /* Handle Layoutreturn errors */
3477 if (pnfs_roc_done(task, calldata->inode,
3478 &calldata->arg.lr_args,
3479 &calldata->res.lr_res,
3480 &calldata->res.lr_ret) == -EAGAIN)
3481 goto out_restart;
3482
3483 /* hmm. we are done with the inode, and in the process of freeing
3484 * the state_owner. we keep this around to process errors
3485 */
3486 switch (task->tk_status) {
3487 case 0:
3488 res_stateid = &calldata->res.stateid;
3489 renew_lease(server, calldata->timestamp);
3490 break;
3491 case -NFS4ERR_ACCESS:
3492 if (calldata->arg.bitmask != NULL) {
3493 calldata->arg.bitmask = NULL;
3494 calldata->res.fattr = NULL;
3495 goto out_restart;
3496
3497 }
3498 break;
3499 case -NFS4ERR_OLD_STATEID:
3500 /* Did we race with OPEN? */
3501 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3502 state))
3503 goto out_restart;
3504 goto out_release;
3505 case -NFS4ERR_ADMIN_REVOKED:
3506 case -NFS4ERR_STALE_STATEID:
3507 case -NFS4ERR_EXPIRED:
3508 nfs4_free_revoked_stateid(server,
3509 &calldata->arg.stateid,
3510 task->tk_msg.rpc_cred);
3511 /* Fallthrough */
3512 case -NFS4ERR_BAD_STATEID:
3513 if (calldata->arg.fmode == 0)
3514 break;
3515 /* Fallthrough */
3516 default:
3517 task->tk_status = nfs4_async_handle_exception(task,
3518 server, task->tk_status, &exception);
3519 if (exception.retry)
3520 goto out_restart;
3521 }
3522 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3523 res_stateid, calldata->arg.fmode);
3524 out_release:
3525 task->tk_status = 0;
3526 nfs_release_seqid(calldata->arg.seqid);
3527 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3528 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3529 return;
3530 out_restart:
3531 task->tk_status = 0;
3532 rpc_restart_call_prepare(task);
3533 goto out_release;
3534 }
3535
3536 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3537 {
3538 struct nfs4_closedata *calldata = data;
3539 struct nfs4_state *state = calldata->state;
3540 struct inode *inode = calldata->inode;
3541 struct pnfs_layout_hdr *lo;
3542 bool is_rdonly, is_wronly, is_rdwr;
3543 int call_close = 0;
3544
3545 dprintk("%s: begin!\n", __func__);
3546 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3547 goto out_wait;
3548
3549 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3550 spin_lock(&state->owner->so_lock);
3551 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3552 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3553 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3554 /* Calculate the change in open mode */
3555 calldata->arg.fmode = 0;
3556 if (state->n_rdwr == 0) {
3557 if (state->n_rdonly == 0)
3558 call_close |= is_rdonly;
3559 else if (is_rdonly)
3560 calldata->arg.fmode |= FMODE_READ;
3561 if (state->n_wronly == 0)
3562 call_close |= is_wronly;
3563 else if (is_wronly)
3564 calldata->arg.fmode |= FMODE_WRITE;
3565 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3566 call_close |= is_rdwr;
3567 } else if (is_rdwr)
3568 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3569
3570 nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3571 if (!nfs4_valid_open_stateid(state))
3572 call_close = 0;
3573 spin_unlock(&state->owner->so_lock);
3574
3575 if (!call_close) {
3576 /* Note: exit _without_ calling nfs4_close_done */
3577 goto out_no_action;
3578 }
3579
3580 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3581 nfs_release_seqid(calldata->arg.seqid);
3582 goto out_wait;
3583 }
3584
3585 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3586 if (lo && !pnfs_layout_is_valid(lo)) {
3587 calldata->arg.lr_args = NULL;
3588 calldata->res.lr_res = NULL;
3589 }
3590
3591 if (calldata->arg.fmode == 0)
3592 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3593
3594 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3595 /* Close-to-open cache consistency revalidation */
3596 if (!nfs4_have_delegation(inode, FMODE_READ))
3597 calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3598 else
3599 calldata->arg.bitmask = NULL;
3600 }
3601
3602 calldata->arg.share_access =
3603 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3604 calldata->arg.fmode, 0);
3605
3606 if (calldata->res.fattr == NULL)
3607 calldata->arg.bitmask = NULL;
3608 else if (calldata->arg.bitmask == NULL)
3609 calldata->res.fattr = NULL;
3610 calldata->timestamp = jiffies;
3611 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3612 &calldata->arg.seq_args,
3613 &calldata->res.seq_res,
3614 task) != 0)
3615 nfs_release_seqid(calldata->arg.seqid);
3616 dprintk("%s: done!\n", __func__);
3617 return;
3618 out_no_action:
3619 task->tk_action = NULL;
3620 out_wait:
3621 nfs4_sequence_done(task, &calldata->res.seq_res);
3622 }
3623
3624 static const struct rpc_call_ops nfs4_close_ops = {
3625 .rpc_call_prepare = nfs4_close_prepare,
3626 .rpc_call_done = nfs4_close_done,
3627 .rpc_release = nfs4_free_closedata,
3628 };
3629
3630 /*
3631 * It is possible for data to be read/written from a mem-mapped file
3632 * after the sys_close call (which hits the vfs layer as a flush).
3633 * This means that we can't safely call nfsv4 close on a file until
3634 * the inode is cleared. This in turn means that we are not good
3635 * NFSv4 citizens - we do not indicate to the server to update the file's
3636 * share state even when we are done with one of the three share
3637 * stateid's in the inode.
3638 *
3639 * NOTE: Caller must be holding the sp->so_owner semaphore!
3640 */
3641 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3642 {
3643 struct nfs_server *server = NFS_SERVER(state->inode);
3644 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3645 struct nfs4_closedata *calldata;
3646 struct nfs4_state_owner *sp = state->owner;
3647 struct rpc_task *task;
3648 struct rpc_message msg = {
3649 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3650 .rpc_cred = state->owner->so_cred,
3651 };
3652 struct rpc_task_setup task_setup_data = {
3653 .rpc_client = server->client,
3654 .rpc_message = &msg,
3655 .callback_ops = &nfs4_close_ops,
3656 .workqueue = nfsiod_workqueue,
3657 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3658 };
3659 int status = -ENOMEM;
3660
3661 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3662 &task_setup_data.rpc_client, &msg);
3663
3664 calldata = kzalloc(sizeof(*calldata), gfp_mask);
3665 if (calldata == NULL)
3666 goto out;
3667 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3668 calldata->inode = state->inode;
3669 calldata->state = state;
3670 calldata->arg.fh = NFS_FH(state->inode);
3671 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3672 goto out_free_calldata;
3673 /* Serialization for the sequence id */
3674 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3675 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3676 if (IS_ERR(calldata->arg.seqid))
3677 goto out_free_calldata;
3678 nfs_fattr_init(&calldata->fattr);
3679 calldata->arg.fmode = 0;
3680 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3681 calldata->res.fattr = &calldata->fattr;
3682 calldata->res.seqid = calldata->arg.seqid;
3683 calldata->res.server = server;
3684 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3685 calldata->lr.roc = pnfs_roc(state->inode,
3686 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3687 if (calldata->lr.roc) {
3688 calldata->arg.lr_args = &calldata->lr.arg;
3689 calldata->res.lr_res = &calldata->lr.res;
3690 }
3691 nfs_sb_active(calldata->inode->i_sb);
3692
3693 msg.rpc_argp = &calldata->arg;
3694 msg.rpc_resp = &calldata->res;
3695 task_setup_data.callback_data = calldata;
3696 task = rpc_run_task(&task_setup_data);
3697 if (IS_ERR(task))
3698 return PTR_ERR(task);
3699 status = 0;
3700 if (wait)
3701 status = rpc_wait_for_completion_task(task);
3702 rpc_put_task(task);
3703 return status;
3704 out_free_calldata:
3705 kfree(calldata);
3706 out:
3707 nfs4_put_open_state(state);
3708 nfs4_put_state_owner(sp);
3709 return status;
3710 }
3711
3712 static struct inode *
3713 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3714 int open_flags, struct iattr *attr, int *opened)
3715 {
3716 struct nfs4_state *state;
3717 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3718
3719 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3720
3721 /* Protect against concurrent sillydeletes */
3722 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3723
3724 nfs4_label_release_security(label);
3725
3726 if (IS_ERR(state))
3727 return ERR_CAST(state);
3728 return state->inode;
3729 }
3730
3731 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3732 {
3733 if (ctx->state == NULL)
3734 return;
3735 if (is_sync)
3736 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3737 else
3738 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3739 }
3740
3741 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3742 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3743 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL)
3744
3745 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3746 {
3747 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3748 struct nfs4_server_caps_arg args = {
3749 .fhandle = fhandle,
3750 .bitmask = bitmask,
3751 };
3752 struct nfs4_server_caps_res res = {};
3753 struct rpc_message msg = {
3754 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3755 .rpc_argp = &args,
3756 .rpc_resp = &res,
3757 };
3758 int status;
3759 int i;
3760
3761 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3762 FATTR4_WORD0_FH_EXPIRE_TYPE |
3763 FATTR4_WORD0_LINK_SUPPORT |
3764 FATTR4_WORD0_SYMLINK_SUPPORT |
3765 FATTR4_WORD0_ACLSUPPORT;
3766 if (minorversion)
3767 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3768
3769 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3770 if (status == 0) {
3771 /* Sanity check the server answers */
3772 switch (minorversion) {
3773 case 0:
3774 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3775 res.attr_bitmask[2] = 0;
3776 break;
3777 case 1:
3778 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3779 break;
3780 case 2:
3781 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3782 }
3783 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3784 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3785 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3786 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3787 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3788 NFS_CAP_CTIME|NFS_CAP_MTIME|
3789 NFS_CAP_SECURITY_LABEL);
3790 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3791 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3792 server->caps |= NFS_CAP_ACLS;
3793 if (res.has_links != 0)
3794 server->caps |= NFS_CAP_HARDLINKS;
3795 if (res.has_symlinks != 0)
3796 server->caps |= NFS_CAP_SYMLINKS;
3797 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3798 server->caps |= NFS_CAP_FILEID;
3799 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3800 server->caps |= NFS_CAP_MODE;
3801 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3802 server->caps |= NFS_CAP_NLINK;
3803 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3804 server->caps |= NFS_CAP_OWNER;
3805 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3806 server->caps |= NFS_CAP_OWNER_GROUP;
3807 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3808 server->caps |= NFS_CAP_ATIME;
3809 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3810 server->caps |= NFS_CAP_CTIME;
3811 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3812 server->caps |= NFS_CAP_MTIME;
3813 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3814 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3815 server->caps |= NFS_CAP_SECURITY_LABEL;
3816 #endif
3817 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3818 sizeof(server->attr_bitmask));
3819 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3820
3821 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3822 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3823 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3824 server->cache_consistency_bitmask[2] = 0;
3825
3826 /* Avoid a regression due to buggy server */
3827 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3828 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3829 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3830 sizeof(server->exclcreat_bitmask));
3831
3832 server->acl_bitmask = res.acl_bitmask;
3833 server->fh_expire_type = res.fh_expire_type;
3834 }
3835
3836 return status;
3837 }
3838
3839 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3840 {
3841 struct nfs4_exception exception = {
3842 .interruptible = true,
3843 };
3844 int err;
3845 do {
3846 err = nfs4_handle_exception(server,
3847 _nfs4_server_capabilities(server, fhandle),
3848 &exception);
3849 } while (exception.retry);
3850 return err;
3851 }
3852
3853 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3854 struct nfs_fsinfo *info)
3855 {
3856 u32 bitmask[3];
3857 struct nfs4_lookup_root_arg args = {
3858 .bitmask = bitmask,
3859 };
3860 struct nfs4_lookup_res res = {
3861 .server = server,
3862 .fattr = info->fattr,
3863 .fh = fhandle,
3864 };
3865 struct rpc_message msg = {
3866 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3867 .rpc_argp = &args,
3868 .rpc_resp = &res,
3869 };
3870
3871 bitmask[0] = nfs4_fattr_bitmap[0];
3872 bitmask[1] = nfs4_fattr_bitmap[1];
3873 /*
3874 * Process the label in the upcoming getfattr
3875 */
3876 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3877
3878 nfs_fattr_init(info->fattr);
3879 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3880 }
3881
3882 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3883 struct nfs_fsinfo *info)
3884 {
3885 struct nfs4_exception exception = {
3886 .interruptible = true,
3887 };
3888 int err;
3889 do {
3890 err = _nfs4_lookup_root(server, fhandle, info);
3891 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3892 switch (err) {
3893 case 0:
3894 case -NFS4ERR_WRONGSEC:
3895 goto out;
3896 default:
3897 err = nfs4_handle_exception(server, err, &exception);
3898 }
3899 } while (exception.retry);
3900 out:
3901 return err;
3902 }
3903
3904 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3905 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3906 {
3907 struct rpc_auth_create_args auth_args = {
3908 .pseudoflavor = flavor,
3909 };
3910 struct rpc_auth *auth;
3911
3912 auth = rpcauth_create(&auth_args, server->client);
3913 if (IS_ERR(auth))
3914 return -EACCES;
3915 return nfs4_lookup_root(server, fhandle, info);
3916 }
3917
3918 /*
3919 * Retry pseudoroot lookup with various security flavors. We do this when:
3920 *
3921 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3922 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3923 *
3924 * Returns zero on success, or a negative NFS4ERR value, or a
3925 * negative errno value.
3926 */
3927 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3928 struct nfs_fsinfo *info)
3929 {
3930 /* Per 3530bis 15.33.5 */
3931 static const rpc_authflavor_t flav_array[] = {
3932 RPC_AUTH_GSS_KRB5P,
3933 RPC_AUTH_GSS_KRB5I,
3934 RPC_AUTH_GSS_KRB5,
3935 RPC_AUTH_UNIX, /* courtesy */
3936 RPC_AUTH_NULL,
3937 };
3938 int status = -EPERM;
3939 size_t i;
3940
3941 if (server->auth_info.flavor_len > 0) {
3942 /* try each flavor specified by user */
3943 for (i = 0; i < server->auth_info.flavor_len; i++) {
3944 status = nfs4_lookup_root_sec(server, fhandle, info,
3945 server->auth_info.flavors[i]);
3946 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3947 continue;
3948 break;
3949 }
3950 } else {
3951 /* no flavors specified by user, try default list */
3952 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3953 status = nfs4_lookup_root_sec(server, fhandle, info,
3954 flav_array[i]);
3955 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3956 continue;
3957 break;
3958 }
3959 }
3960
3961 /*
3962 * -EACCES could mean that the user doesn't have correct permissions
3963 * to access the mount. It could also mean that we tried to mount
3964 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
3965 * existing mount programs don't handle -EACCES very well so it should
3966 * be mapped to -EPERM instead.
3967 */
3968 if (status == -EACCES)
3969 status = -EPERM;
3970 return status;
3971 }
3972
3973 /**
3974 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3975 * @server: initialized nfs_server handle
3976 * @fhandle: we fill in the pseudo-fs root file handle
3977 * @info: we fill in an FSINFO struct
3978 * @auth_probe: probe the auth flavours
3979 *
3980 * Returns zero on success, or a negative errno.
3981 */
3982 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3983 struct nfs_fsinfo *info,
3984 bool auth_probe)
3985 {
3986 int status = 0;
3987
3988 if (!auth_probe)
3989 status = nfs4_lookup_root(server, fhandle, info);
3990
3991 if (auth_probe || status == NFS4ERR_WRONGSEC)
3992 status = server->nfs_client->cl_mvops->find_root_sec(server,
3993 fhandle, info);
3994
3995 if (status == 0)
3996 status = nfs4_server_capabilities(server, fhandle);
3997 if (status == 0)
3998 status = nfs4_do_fsinfo(server, fhandle, info);
3999
4000 return nfs4_map_errors(status);
4001 }
4002
4003 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4004 struct nfs_fsinfo *info)
4005 {
4006 int error;
4007 struct nfs_fattr *fattr = info->fattr;
4008 struct nfs4_label *label = fattr->label;
4009
4010 error = nfs4_server_capabilities(server, mntfh);
4011 if (error < 0) {
4012 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4013 return error;
4014 }
4015
4016 error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL);
4017 if (error < 0) {
4018 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4019 goto out;
4020 }
4021
4022 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4023 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4024 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4025
4026 out:
4027 return error;
4028 }
4029
4030 /*
4031 * Get locations and (maybe) other attributes of a referral.
4032 * Note that we'll actually follow the referral later when
4033 * we detect fsid mismatch in inode revalidation
4034 */
4035 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4036 const struct qstr *name, struct nfs_fattr *fattr,
4037 struct nfs_fh *fhandle)
4038 {
4039 int status = -ENOMEM;
4040 struct page *page = NULL;
4041 struct nfs4_fs_locations *locations = NULL;
4042
4043 page = alloc_page(GFP_KERNEL);
4044 if (page == NULL)
4045 goto out;
4046 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4047 if (locations == NULL)
4048 goto out;
4049
4050 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4051 if (status != 0)
4052 goto out;
4053
4054 /*
4055 * If the fsid didn't change, this is a migration event, not a
4056 * referral. Cause us to drop into the exception handler, which
4057 * will kick off migration recovery.
4058 */
4059 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
4060 dprintk("%s: server did not return a different fsid for"
4061 " a referral at %s\n", __func__, name->name);
4062 status = -NFS4ERR_MOVED;
4063 goto out;
4064 }
4065 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4066 nfs_fixup_referral_attributes(&locations->fattr);
4067
4068 /* replace the lookup nfs_fattr with the locations nfs_fattr */
4069 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
4070 memset(fhandle, 0, sizeof(struct nfs_fh));
4071 out:
4072 if (page)
4073 __free_page(page);
4074 kfree(locations);
4075 return status;
4076 }
4077
4078 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4079 struct nfs_fattr *fattr, struct nfs4_label *label,
4080 struct inode *inode)
4081 {
4082 __u32 bitmask[NFS4_BITMASK_SZ];
4083 struct nfs4_getattr_arg args = {
4084 .fh = fhandle,
4085 .bitmask = bitmask,
4086 };
4087 struct nfs4_getattr_res res = {
4088 .fattr = fattr,
4089 .label = label,
4090 .server = server,
4091 };
4092 struct rpc_message msg = {
4093 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4094 .rpc_argp = &args,
4095 .rpc_resp = &res,
4096 };
4097 unsigned short task_flags = 0;
4098
4099 /* Is this is an attribute revalidation, subject to softreval? */
4100 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4101 task_flags |= RPC_TASK_TIMEOUT;
4102
4103 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
4104
4105 nfs_fattr_init(fattr);
4106 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4107 return nfs4_do_call_sync(server->client, server, &msg,
4108 &args.seq_args, &res.seq_res, task_flags);
4109 }
4110
4111 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4112 struct nfs_fattr *fattr, struct nfs4_label *label,
4113 struct inode *inode)
4114 {
4115 struct nfs4_exception exception = {
4116 .interruptible = true,
4117 };
4118 int err;
4119 do {
4120 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode);
4121 trace_nfs4_getattr(server, fhandle, fattr, err);
4122 err = nfs4_handle_exception(server, err,
4123 &exception);
4124 } while (exception.retry);
4125 return err;
4126 }
4127
4128 /*
4129 * The file is not closed if it is opened due to the a request to change
4130 * the size of the file. The open call will not be needed once the
4131 * VFS layer lookup-intents are implemented.
4132 *
4133 * Close is called when the inode is destroyed.
4134 * If we haven't opened the file for O_WRONLY, we
4135 * need to in the size_change case to obtain a stateid.
4136 *
4137 * Got race?
4138 * Because OPEN is always done by name in nfsv4, it is
4139 * possible that we opened a different file by the same
4140 * name. We can recognize this race condition, but we
4141 * can't do anything about it besides returning an error.
4142 *
4143 * This will be fixed with VFS changes (lookup-intent).
4144 */
4145 static int
4146 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4147 struct iattr *sattr)
4148 {
4149 struct inode *inode = d_inode(dentry);
4150 const struct cred *cred = NULL;
4151 struct nfs_open_context *ctx = NULL;
4152 struct nfs4_label *label = NULL;
4153 int status;
4154
4155 if (pnfs_ld_layoutret_on_setattr(inode) &&
4156 sattr->ia_valid & ATTR_SIZE &&
4157 sattr->ia_size < i_size_read(inode))
4158 pnfs_commit_and_return_layout(inode);
4159
4160 nfs_fattr_init(fattr);
4161
4162 /* Deal with open(O_TRUNC) */
4163 if (sattr->ia_valid & ATTR_OPEN)
4164 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4165
4166 /* Optimization: if the end result is no change, don't RPC */
4167 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4168 return 0;
4169
4170 /* Search for an existing open(O_WRITE) file */
4171 if (sattr->ia_valid & ATTR_FILE) {
4172
4173 ctx = nfs_file_open_context(sattr->ia_file);
4174 if (ctx)
4175 cred = ctx->cred;
4176 }
4177
4178 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4179 if (IS_ERR(label))
4180 return PTR_ERR(label);
4181
4182 /* Return any delegations if we're going to change ACLs */
4183 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4184 nfs4_inode_make_writeable(inode);
4185
4186 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
4187 if (status == 0) {
4188 nfs_setattr_update_inode(inode, sattr, fattr);
4189 nfs_setsecurity(inode, fattr, label);
4190 }
4191 nfs4_label_free(label);
4192 return status;
4193 }
4194
4195 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4196 struct dentry *dentry, struct nfs_fh *fhandle,
4197 struct nfs_fattr *fattr, struct nfs4_label *label)
4198 {
4199 struct nfs_server *server = NFS_SERVER(dir);
4200 int status;
4201 struct nfs4_lookup_arg args = {
4202 .bitmask = server->attr_bitmask,
4203 .dir_fh = NFS_FH(dir),
4204 .name = &dentry->d_name,
4205 };
4206 struct nfs4_lookup_res res = {
4207 .server = server,
4208 .fattr = fattr,
4209 .label = label,
4210 .fh = fhandle,
4211 };
4212 struct rpc_message msg = {
4213 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4214 .rpc_argp = &args,
4215 .rpc_resp = &res,
4216 };
4217 unsigned short task_flags = 0;
4218
4219 /* Is this is an attribute revalidation, subject to softreval? */
4220 if (nfs_lookup_is_soft_revalidate(dentry))
4221 task_flags |= RPC_TASK_TIMEOUT;
4222
4223 args.bitmask = nfs4_bitmask(server, label);
4224
4225 nfs_fattr_init(fattr);
4226
4227 dprintk("NFS call lookup %pd2\n", dentry);
4228 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4229 status = nfs4_do_call_sync(clnt, server, &msg,
4230 &args.seq_args, &res.seq_res, task_flags);
4231 dprintk("NFS reply lookup: %d\n", status);
4232 return status;
4233 }
4234
4235 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4236 {
4237 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4238 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4239 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4240 fattr->nlink = 2;
4241 }
4242
4243 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4244 struct dentry *dentry, struct nfs_fh *fhandle,
4245 struct nfs_fattr *fattr, struct nfs4_label *label)
4246 {
4247 struct nfs4_exception exception = {
4248 .interruptible = true,
4249 };
4250 struct rpc_clnt *client = *clnt;
4251 const struct qstr *name = &dentry->d_name;
4252 int err;
4253 do {
4254 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr, label);
4255 trace_nfs4_lookup(dir, name, err);
4256 switch (err) {
4257 case -NFS4ERR_BADNAME:
4258 err = -ENOENT;
4259 goto out;
4260 case -NFS4ERR_MOVED:
4261 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4262 if (err == -NFS4ERR_MOVED)
4263 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4264 goto out;
4265 case -NFS4ERR_WRONGSEC:
4266 err = -EPERM;
4267 if (client != *clnt)
4268 goto out;
4269 client = nfs4_negotiate_security(client, dir, name);
4270 if (IS_ERR(client))
4271 return PTR_ERR(client);
4272
4273 exception.retry = 1;
4274 break;
4275 default:
4276 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4277 }
4278 } while (exception.retry);
4279
4280 out:
4281 if (err == 0)
4282 *clnt = client;
4283 else if (client != *clnt)
4284 rpc_shutdown_client(client);
4285
4286 return err;
4287 }
4288
4289 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4290 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4291 struct nfs4_label *label)
4292 {
4293 int status;
4294 struct rpc_clnt *client = NFS_CLIENT(dir);
4295
4296 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, label);
4297 if (client != NFS_CLIENT(dir)) {
4298 rpc_shutdown_client(client);
4299 nfs_fixup_secinfo_attributes(fattr);
4300 }
4301 return status;
4302 }
4303
4304 struct rpc_clnt *
4305 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4306 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4307 {
4308 struct rpc_clnt *client = NFS_CLIENT(dir);
4309 int status;
4310
4311 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, NULL);
4312 if (status < 0)
4313 return ERR_PTR(status);
4314 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4315 }
4316
4317 static int _nfs4_proc_lookupp(struct inode *inode,
4318 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4319 struct nfs4_label *label)
4320 {
4321 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4322 struct nfs_server *server = NFS_SERVER(inode);
4323 int status;
4324 struct nfs4_lookupp_arg args = {
4325 .bitmask = server->attr_bitmask,
4326 .fh = NFS_FH(inode),
4327 };
4328 struct nfs4_lookupp_res res = {
4329 .server = server,
4330 .fattr = fattr,
4331 .label = label,
4332 .fh = fhandle,
4333 };
4334 struct rpc_message msg = {
4335 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4336 .rpc_argp = &args,
4337 .rpc_resp = &res,
4338 };
4339
4340 args.bitmask = nfs4_bitmask(server, label);
4341
4342 nfs_fattr_init(fattr);
4343
4344 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino);
4345 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4346 &res.seq_res, 0);
4347 dprintk("NFS reply lookupp: %d\n", status);
4348 return status;
4349 }
4350
4351 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4352 struct nfs_fattr *fattr, struct nfs4_label *label)
4353 {
4354 struct nfs4_exception exception = {
4355 .interruptible = true,
4356 };
4357 int err;
4358 do {
4359 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4360 trace_nfs4_lookupp(inode, err);
4361 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4362 &exception);
4363 } while (exception.retry);
4364 return err;
4365 }
4366
4367 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4368 {
4369 struct nfs_server *server = NFS_SERVER(inode);
4370 struct nfs4_accessargs args = {
4371 .fh = NFS_FH(inode),
4372 .access = entry->mask,
4373 };
4374 struct nfs4_accessres res = {
4375 .server = server,
4376 };
4377 struct rpc_message msg = {
4378 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4379 .rpc_argp = &args,
4380 .rpc_resp = &res,
4381 .rpc_cred = entry->cred,
4382 };
4383 int status = 0;
4384
4385 if (!nfs4_have_delegation(inode, FMODE_READ)) {
4386 res.fattr = nfs_alloc_fattr();
4387 if (res.fattr == NULL)
4388 return -ENOMEM;
4389 args.bitmask = server->cache_consistency_bitmask;
4390 }
4391 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4392 if (!status) {
4393 nfs_access_set_mask(entry, res.access);
4394 if (res.fattr)
4395 nfs_refresh_inode(inode, res.fattr);
4396 }
4397 nfs_free_fattr(res.fattr);
4398 return status;
4399 }
4400
4401 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4402 {
4403 struct nfs4_exception exception = {
4404 .interruptible = true,
4405 };
4406 int err;
4407 do {
4408 err = _nfs4_proc_access(inode, entry);
4409 trace_nfs4_access(inode, err);
4410 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4411 &exception);
4412 } while (exception.retry);
4413 return err;
4414 }
4415
4416 /*
4417 * TODO: For the time being, we don't try to get any attributes
4418 * along with any of the zero-copy operations READ, READDIR,
4419 * READLINK, WRITE.
4420 *
4421 * In the case of the first three, we want to put the GETATTR
4422 * after the read-type operation -- this is because it is hard
4423 * to predict the length of a GETATTR response in v4, and thus
4424 * align the READ data correctly. This means that the GETATTR
4425 * may end up partially falling into the page cache, and we should
4426 * shift it into the 'tail' of the xdr_buf before processing.
4427 * To do this efficiently, we need to know the total length
4428 * of data received, which doesn't seem to be available outside
4429 * of the RPC layer.
4430 *
4431 * In the case of WRITE, we also want to put the GETATTR after
4432 * the operation -- in this case because we want to make sure
4433 * we get the post-operation mtime and size.
4434 *
4435 * Both of these changes to the XDR layer would in fact be quite
4436 * minor, but I decided to leave them for a subsequent patch.
4437 */
4438 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4439 unsigned int pgbase, unsigned int pglen)
4440 {
4441 struct nfs4_readlink args = {
4442 .fh = NFS_FH(inode),
4443 .pgbase = pgbase,
4444 .pglen = pglen,
4445 .pages = &page,
4446 };
4447 struct nfs4_readlink_res res;
4448 struct rpc_message msg = {
4449 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4450 .rpc_argp = &args,
4451 .rpc_resp = &res,
4452 };
4453
4454 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4455 }
4456
4457 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4458 unsigned int pgbase, unsigned int pglen)
4459 {
4460 struct nfs4_exception exception = {
4461 .interruptible = true,
4462 };
4463 int err;
4464 do {
4465 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4466 trace_nfs4_readlink(inode, err);
4467 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4468 &exception);
4469 } while (exception.retry);
4470 return err;
4471 }
4472
4473 /*
4474 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4475 */
4476 static int
4477 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4478 int flags)
4479 {
4480 struct nfs_server *server = NFS_SERVER(dir);
4481 struct nfs4_label l, *ilabel = NULL;
4482 struct nfs_open_context *ctx;
4483 struct nfs4_state *state;
4484 int status = 0;
4485
4486 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4487 if (IS_ERR(ctx))
4488 return PTR_ERR(ctx);
4489
4490 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4491
4492 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4493 sattr->ia_mode &= ~current_umask();
4494 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4495 if (IS_ERR(state)) {
4496 status = PTR_ERR(state);
4497 goto out;
4498 }
4499 out:
4500 nfs4_label_release_security(ilabel);
4501 put_nfs_open_context(ctx);
4502 return status;
4503 }
4504
4505 static int
4506 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4507 {
4508 struct nfs_server *server = NFS_SERVER(dir);
4509 struct nfs_removeargs args = {
4510 .fh = NFS_FH(dir),
4511 .name = *name,
4512 };
4513 struct nfs_removeres res = {
4514 .server = server,
4515 };
4516 struct rpc_message msg = {
4517 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4518 .rpc_argp = &args,
4519 .rpc_resp = &res,
4520 };
4521 unsigned long timestamp = jiffies;
4522 int status;
4523
4524 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4525 if (status == 0) {
4526 spin_lock(&dir->i_lock);
4527 update_changeattr_locked(dir, &res.cinfo, timestamp, 0);
4528 /* Removing a directory decrements nlink in the parent */
4529 if (ftype == NF4DIR && dir->i_nlink > 2)
4530 nfs4_dec_nlink_locked(dir);
4531 spin_unlock(&dir->i_lock);
4532 }
4533 return status;
4534 }
4535
4536 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4537 {
4538 struct nfs4_exception exception = {
4539 .interruptible = true,
4540 };
4541 struct inode *inode = d_inode(dentry);
4542 int err;
4543
4544 if (inode) {
4545 if (inode->i_nlink == 1)
4546 nfs4_inode_return_delegation(inode);
4547 else
4548 nfs4_inode_make_writeable(inode);
4549 }
4550 do {
4551 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4552 trace_nfs4_remove(dir, &dentry->d_name, err);
4553 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4554 &exception);
4555 } while (exception.retry);
4556 return err;
4557 }
4558
4559 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4560 {
4561 struct nfs4_exception exception = {
4562 .interruptible = true,
4563 };
4564 int err;
4565
4566 do {
4567 err = _nfs4_proc_remove(dir, name, NF4DIR);
4568 trace_nfs4_remove(dir, name, err);
4569 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4570 &exception);
4571 } while (exception.retry);
4572 return err;
4573 }
4574
4575 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4576 struct dentry *dentry,
4577 struct inode *inode)
4578 {
4579 struct nfs_removeargs *args = msg->rpc_argp;
4580 struct nfs_removeres *res = msg->rpc_resp;
4581
4582 res->server = NFS_SB(dentry->d_sb);
4583 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4584 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4585
4586 nfs_fattr_init(res->dir_attr);
4587
4588 if (inode)
4589 nfs4_inode_return_delegation(inode);
4590 }
4591
4592 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4593 {
4594 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4595 &data->args.seq_args,
4596 &data->res.seq_res,
4597 task);
4598 }
4599
4600 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4601 {
4602 struct nfs_unlinkdata *data = task->tk_calldata;
4603 struct nfs_removeres *res = &data->res;
4604
4605 if (!nfs4_sequence_done(task, &res->seq_res))
4606 return 0;
4607 if (nfs4_async_handle_error(task, res->server, NULL,
4608 &data->timeout) == -EAGAIN)
4609 return 0;
4610 if (task->tk_status == 0)
4611 update_changeattr(dir, &res->cinfo,
4612 res->dir_attr->time_start, 0);
4613 return 1;
4614 }
4615
4616 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4617 struct dentry *old_dentry,
4618 struct dentry *new_dentry)
4619 {
4620 struct nfs_renameargs *arg = msg->rpc_argp;
4621 struct nfs_renameres *res = msg->rpc_resp;
4622 struct inode *old_inode = d_inode(old_dentry);
4623 struct inode *new_inode = d_inode(new_dentry);
4624
4625 if (old_inode)
4626 nfs4_inode_make_writeable(old_inode);
4627 if (new_inode)
4628 nfs4_inode_return_delegation(new_inode);
4629 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4630 res->server = NFS_SB(old_dentry->d_sb);
4631 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4632 }
4633
4634 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4635 {
4636 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4637 &data->args.seq_args,
4638 &data->res.seq_res,
4639 task);
4640 }
4641
4642 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4643 struct inode *new_dir)
4644 {
4645 struct nfs_renamedata *data = task->tk_calldata;
4646 struct nfs_renameres *res = &data->res;
4647
4648 if (!nfs4_sequence_done(task, &res->seq_res))
4649 return 0;
4650 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4651 return 0;
4652
4653 if (task->tk_status == 0) {
4654 if (new_dir != old_dir) {
4655 /* Note: If we moved a directory, nlink will change */
4656 update_changeattr(old_dir, &res->old_cinfo,
4657 res->old_fattr->time_start,
4658 NFS_INO_INVALID_OTHER);
4659 update_changeattr(new_dir, &res->new_cinfo,
4660 res->new_fattr->time_start,
4661 NFS_INO_INVALID_OTHER);
4662 } else
4663 update_changeattr(old_dir, &res->old_cinfo,
4664 res->old_fattr->time_start,
4665 0);
4666 }
4667 return 1;
4668 }
4669
4670 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4671 {
4672 struct nfs_server *server = NFS_SERVER(inode);
4673 __u32 bitmask[NFS4_BITMASK_SZ];
4674 struct nfs4_link_arg arg = {
4675 .fh = NFS_FH(inode),
4676 .dir_fh = NFS_FH(dir),
4677 .name = name,
4678 .bitmask = bitmask,
4679 };
4680 struct nfs4_link_res res = {
4681 .server = server,
4682 .label = NULL,
4683 };
4684 struct rpc_message msg = {
4685 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4686 .rpc_argp = &arg,
4687 .rpc_resp = &res,
4688 };
4689 int status = -ENOMEM;
4690
4691 res.fattr = nfs_alloc_fattr();
4692 if (res.fattr == NULL)
4693 goto out;
4694
4695 res.label = nfs4_label_alloc(server, GFP_KERNEL);
4696 if (IS_ERR(res.label)) {
4697 status = PTR_ERR(res.label);
4698 goto out;
4699 }
4700
4701 nfs4_inode_make_writeable(inode);
4702 nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode);
4703
4704 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4705 if (!status) {
4706 update_changeattr(dir, &res.cinfo, res.fattr->time_start, 0);
4707 status = nfs_post_op_update_inode(inode, res.fattr);
4708 if (!status)
4709 nfs_setsecurity(inode, res.fattr, res.label);
4710 }
4711
4712
4713 nfs4_label_free(res.label);
4714
4715 out:
4716 nfs_free_fattr(res.fattr);
4717 return status;
4718 }
4719
4720 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4721 {
4722 struct nfs4_exception exception = {
4723 .interruptible = true,
4724 };
4725 int err;
4726 do {
4727 err = nfs4_handle_exception(NFS_SERVER(inode),
4728 _nfs4_proc_link(inode, dir, name),
4729 &exception);
4730 } while (exception.retry);
4731 return err;
4732 }
4733
4734 struct nfs4_createdata {
4735 struct rpc_message msg;
4736 struct nfs4_create_arg arg;
4737 struct nfs4_create_res res;
4738 struct nfs_fh fh;
4739 struct nfs_fattr fattr;
4740 struct nfs4_label *label;
4741 };
4742
4743 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4744 const struct qstr *name, struct iattr *sattr, u32 ftype)
4745 {
4746 struct nfs4_createdata *data;
4747
4748 data = kzalloc(sizeof(*data), GFP_KERNEL);
4749 if (data != NULL) {
4750 struct nfs_server *server = NFS_SERVER(dir);
4751
4752 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4753 if (IS_ERR(data->label))
4754 goto out_free;
4755
4756 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4757 data->msg.rpc_argp = &data->arg;
4758 data->msg.rpc_resp = &data->res;
4759 data->arg.dir_fh = NFS_FH(dir);
4760 data->arg.server = server;
4761 data->arg.name = name;
4762 data->arg.attrs = sattr;
4763 data->arg.ftype = ftype;
4764 data->arg.bitmask = nfs4_bitmask(server, data->label);
4765 data->arg.umask = current_umask();
4766 data->res.server = server;
4767 data->res.fh = &data->fh;
4768 data->res.fattr = &data->fattr;
4769 data->res.label = data->label;
4770 nfs_fattr_init(data->res.fattr);
4771 }
4772 return data;
4773 out_free:
4774 kfree(data);
4775 return NULL;
4776 }
4777
4778 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4779 {
4780 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4781 &data->arg.seq_args, &data->res.seq_res, 1);
4782 if (status == 0) {
4783 spin_lock(&dir->i_lock);
4784 update_changeattr_locked(dir, &data->res.dir_cinfo,
4785 data->res.fattr->time_start, 0);
4786 /* Creating a directory bumps nlink in the parent */
4787 if (data->arg.ftype == NF4DIR)
4788 nfs4_inc_nlink_locked(dir);
4789 spin_unlock(&dir->i_lock);
4790 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4791 }
4792 return status;
4793 }
4794
4795 static void nfs4_free_createdata(struct nfs4_createdata *data)
4796 {
4797 nfs4_label_free(data->label);
4798 kfree(data);
4799 }
4800
4801 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4802 struct page *page, unsigned int len, struct iattr *sattr,
4803 struct nfs4_label *label)
4804 {
4805 struct nfs4_createdata *data;
4806 int status = -ENAMETOOLONG;
4807
4808 if (len > NFS4_MAXPATHLEN)
4809 goto out;
4810
4811 status = -ENOMEM;
4812 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4813 if (data == NULL)
4814 goto out;
4815
4816 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4817 data->arg.u.symlink.pages = &page;
4818 data->arg.u.symlink.len = len;
4819 data->arg.label = label;
4820
4821 status = nfs4_do_create(dir, dentry, data);
4822
4823 nfs4_free_createdata(data);
4824 out:
4825 return status;
4826 }
4827
4828 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4829 struct page *page, unsigned int len, struct iattr *sattr)
4830 {
4831 struct nfs4_exception exception = {
4832 .interruptible = true,
4833 };
4834 struct nfs4_label l, *label = NULL;
4835 int err;
4836
4837 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4838
4839 do {
4840 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4841 trace_nfs4_symlink(dir, &dentry->d_name, err);
4842 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4843 &exception);
4844 } while (exception.retry);
4845
4846 nfs4_label_release_security(label);
4847 return err;
4848 }
4849
4850 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4851 struct iattr *sattr, struct nfs4_label *label)
4852 {
4853 struct nfs4_createdata *data;
4854 int status = -ENOMEM;
4855
4856 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4857 if (data == NULL)
4858 goto out;
4859
4860 data->arg.label = label;
4861 status = nfs4_do_create(dir, dentry, data);
4862
4863 nfs4_free_createdata(data);
4864 out:
4865 return status;
4866 }
4867
4868 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4869 struct iattr *sattr)
4870 {
4871 struct nfs_server *server = NFS_SERVER(dir);
4872 struct nfs4_exception exception = {
4873 .interruptible = true,
4874 };
4875 struct nfs4_label l, *label = NULL;
4876 int err;
4877
4878 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4879
4880 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4881 sattr->ia_mode &= ~current_umask();
4882 do {
4883 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4884 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4885 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4886 &exception);
4887 } while (exception.retry);
4888 nfs4_label_release_security(label);
4889
4890 return err;
4891 }
4892
4893 static int _nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4894 u64 cookie, struct page **pages, unsigned int count, bool plus)
4895 {
4896 struct inode *dir = d_inode(dentry);
4897 struct nfs4_readdir_arg args = {
4898 .fh = NFS_FH(dir),
4899 .pages = pages,
4900 .pgbase = 0,
4901 .count = count,
4902 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4903 .plus = plus,
4904 };
4905 struct nfs4_readdir_res res;
4906 struct rpc_message msg = {
4907 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4908 .rpc_argp = &args,
4909 .rpc_resp = &res,
4910 .rpc_cred = cred,
4911 };
4912 int status;
4913
4914 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4915 dentry,
4916 (unsigned long long)cookie);
4917 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4918 res.pgbase = args.pgbase;
4919 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4920 if (status >= 0) {
4921 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4922 status += args.pgbase;
4923 }
4924
4925 nfs_invalidate_atime(dir);
4926
4927 dprintk("%s: returns %d\n", __func__, status);
4928 return status;
4929 }
4930
4931 static int nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4932 u64 cookie, struct page **pages, unsigned int count, bool plus)
4933 {
4934 struct nfs4_exception exception = {
4935 .interruptible = true,
4936 };
4937 int err;
4938 do {
4939 err = _nfs4_proc_readdir(dentry, cred, cookie,
4940 pages, count, plus);
4941 trace_nfs4_readdir(d_inode(dentry), err);
4942 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4943 &exception);
4944 } while (exception.retry);
4945 return err;
4946 }
4947
4948 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4949 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4950 {
4951 struct nfs4_createdata *data;
4952 int mode = sattr->ia_mode;
4953 int status = -ENOMEM;
4954
4955 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4956 if (data == NULL)
4957 goto out;
4958
4959 if (S_ISFIFO(mode))
4960 data->arg.ftype = NF4FIFO;
4961 else if (S_ISBLK(mode)) {
4962 data->arg.ftype = NF4BLK;
4963 data->arg.u.device.specdata1 = MAJOR(rdev);
4964 data->arg.u.device.specdata2 = MINOR(rdev);
4965 }
4966 else if (S_ISCHR(mode)) {
4967 data->arg.ftype = NF4CHR;
4968 data->arg.u.device.specdata1 = MAJOR(rdev);
4969 data->arg.u.device.specdata2 = MINOR(rdev);
4970 } else if (!S_ISSOCK(mode)) {
4971 status = -EINVAL;
4972 goto out_free;
4973 }
4974
4975 data->arg.label = label;
4976 status = nfs4_do_create(dir, dentry, data);
4977 out_free:
4978 nfs4_free_createdata(data);
4979 out:
4980 return status;
4981 }
4982
4983 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4984 struct iattr *sattr, dev_t rdev)
4985 {
4986 struct nfs_server *server = NFS_SERVER(dir);
4987 struct nfs4_exception exception = {
4988 .interruptible = true,
4989 };
4990 struct nfs4_label l, *label = NULL;
4991 int err;
4992
4993 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4994
4995 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4996 sattr->ia_mode &= ~current_umask();
4997 do {
4998 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4999 trace_nfs4_mknod(dir, &dentry->d_name, err);
5000 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5001 &exception);
5002 } while (exception.retry);
5003
5004 nfs4_label_release_security(label);
5005
5006 return err;
5007 }
5008
5009 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5010 struct nfs_fsstat *fsstat)
5011 {
5012 struct nfs4_statfs_arg args = {
5013 .fh = fhandle,
5014 .bitmask = server->attr_bitmask,
5015 };
5016 struct nfs4_statfs_res res = {
5017 .fsstat = fsstat,
5018 };
5019 struct rpc_message msg = {
5020 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5021 .rpc_argp = &args,
5022 .rpc_resp = &res,
5023 };
5024
5025 nfs_fattr_init(fsstat->fattr);
5026 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5027 }
5028
5029 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5030 {
5031 struct nfs4_exception exception = {
5032 .interruptible = true,
5033 };
5034 int err;
5035 do {
5036 err = nfs4_handle_exception(server,
5037 _nfs4_proc_statfs(server, fhandle, fsstat),
5038 &exception);
5039 } while (exception.retry);
5040 return err;
5041 }
5042
5043 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5044 struct nfs_fsinfo *fsinfo)
5045 {
5046 struct nfs4_fsinfo_arg args = {
5047 .fh = fhandle,
5048 .bitmask = server->attr_bitmask,
5049 };
5050 struct nfs4_fsinfo_res res = {
5051 .fsinfo = fsinfo,
5052 };
5053 struct rpc_message msg = {
5054 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5055 .rpc_argp = &args,
5056 .rpc_resp = &res,
5057 };
5058
5059 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5060 }
5061
5062 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5063 {
5064 struct nfs4_exception exception = {
5065 .interruptible = true,
5066 };
5067 int err;
5068
5069 do {
5070 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5071 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5072 if (err == 0) {
5073 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5074 break;
5075 }
5076 err = nfs4_handle_exception(server, err, &exception);
5077 } while (exception.retry);
5078 return err;
5079 }
5080
5081 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5082 {
5083 int error;
5084
5085 nfs_fattr_init(fsinfo->fattr);
5086 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5087 if (error == 0) {
5088 /* block layout checks this! */
5089 server->pnfs_blksize = fsinfo->blksize;
5090 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5091 }
5092
5093 return error;
5094 }
5095
5096 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5097 struct nfs_pathconf *pathconf)
5098 {
5099 struct nfs4_pathconf_arg args = {
5100 .fh = fhandle,
5101 .bitmask = server->attr_bitmask,
5102 };
5103 struct nfs4_pathconf_res res = {
5104 .pathconf = pathconf,
5105 };
5106 struct rpc_message msg = {
5107 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5108 .rpc_argp = &args,
5109 .rpc_resp = &res,
5110 };
5111
5112 /* None of the pathconf attributes are mandatory to implement */
5113 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5114 memset(pathconf, 0, sizeof(*pathconf));
5115 return 0;
5116 }
5117
5118 nfs_fattr_init(pathconf->fattr);
5119 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5120 }
5121
5122 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5123 struct nfs_pathconf *pathconf)
5124 {
5125 struct nfs4_exception exception = {
5126 .interruptible = true,
5127 };
5128 int err;
5129
5130 do {
5131 err = nfs4_handle_exception(server,
5132 _nfs4_proc_pathconf(server, fhandle, pathconf),
5133 &exception);
5134 } while (exception.retry);
5135 return err;
5136 }
5137
5138 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5139 const struct nfs_open_context *ctx,
5140 const struct nfs_lock_context *l_ctx,
5141 fmode_t fmode)
5142 {
5143 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5144 }
5145 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5146
5147 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5148 const struct nfs_open_context *ctx,
5149 const struct nfs_lock_context *l_ctx,
5150 fmode_t fmode)
5151 {
5152 nfs4_stateid _current_stateid;
5153
5154 /* If the current stateid represents a lost lock, then exit */
5155 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5156 return true;
5157 return nfs4_stateid_match(stateid, &_current_stateid);
5158 }
5159
5160 static bool nfs4_error_stateid_expired(int err)
5161 {
5162 switch (err) {
5163 case -NFS4ERR_DELEG_REVOKED:
5164 case -NFS4ERR_ADMIN_REVOKED:
5165 case -NFS4ERR_BAD_STATEID:
5166 case -NFS4ERR_STALE_STATEID:
5167 case -NFS4ERR_OLD_STATEID:
5168 case -NFS4ERR_OPENMODE:
5169 case -NFS4ERR_EXPIRED:
5170 return true;
5171 }
5172 return false;
5173 }
5174
5175 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5176 {
5177 struct nfs_server *server = NFS_SERVER(hdr->inode);
5178
5179 trace_nfs4_read(hdr, task->tk_status);
5180 if (task->tk_status < 0) {
5181 struct nfs4_exception exception = {
5182 .inode = hdr->inode,
5183 .state = hdr->args.context->state,
5184 .stateid = &hdr->args.stateid,
5185 };
5186 task->tk_status = nfs4_async_handle_exception(task,
5187 server, task->tk_status, &exception);
5188 if (exception.retry) {
5189 rpc_restart_call_prepare(task);
5190 return -EAGAIN;
5191 }
5192 }
5193
5194 if (task->tk_status > 0)
5195 renew_lease(server, hdr->timestamp);
5196 return 0;
5197 }
5198
5199 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5200 struct nfs_pgio_args *args)
5201 {
5202
5203 if (!nfs4_error_stateid_expired(task->tk_status) ||
5204 nfs4_stateid_is_current(&args->stateid,
5205 args->context,
5206 args->lock_context,
5207 FMODE_READ))
5208 return false;
5209 rpc_restart_call_prepare(task);
5210 return true;
5211 }
5212
5213 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5214 {
5215
5216 dprintk("--> %s\n", __func__);
5217
5218 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5219 return -EAGAIN;
5220 if (nfs4_read_stateid_changed(task, &hdr->args))
5221 return -EAGAIN;
5222 if (task->tk_status > 0)
5223 nfs_invalidate_atime(hdr->inode);
5224 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5225 nfs4_read_done_cb(task, hdr);
5226 }
5227
5228 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5229 struct rpc_message *msg)
5230 {
5231 hdr->timestamp = jiffies;
5232 if (!hdr->pgio_done_cb)
5233 hdr->pgio_done_cb = nfs4_read_done_cb;
5234 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5235 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5236 }
5237
5238 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5239 struct nfs_pgio_header *hdr)
5240 {
5241 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5242 &hdr->args.seq_args,
5243 &hdr->res.seq_res,
5244 task))
5245 return 0;
5246 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5247 hdr->args.lock_context,
5248 hdr->rw_mode) == -EIO)
5249 return -EIO;
5250 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5251 return -EIO;
5252 return 0;
5253 }
5254
5255 static int nfs4_write_done_cb(struct rpc_task *task,
5256 struct nfs_pgio_header *hdr)
5257 {
5258 struct inode *inode = hdr->inode;
5259
5260 trace_nfs4_write(hdr, task->tk_status);
5261 if (task->tk_status < 0) {
5262 struct nfs4_exception exception = {
5263 .inode = hdr->inode,
5264 .state = hdr->args.context->state,
5265 .stateid = &hdr->args.stateid,
5266 };
5267 task->tk_status = nfs4_async_handle_exception(task,
5268 NFS_SERVER(inode), task->tk_status,
5269 &exception);
5270 if (exception.retry) {
5271 rpc_restart_call_prepare(task);
5272 return -EAGAIN;
5273 }
5274 }
5275 if (task->tk_status >= 0) {
5276 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5277 nfs_writeback_update_inode(hdr);
5278 }
5279 return 0;
5280 }
5281
5282 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5283 struct nfs_pgio_args *args)
5284 {
5285
5286 if (!nfs4_error_stateid_expired(task->tk_status) ||
5287 nfs4_stateid_is_current(&args->stateid,
5288 args->context,
5289 args->lock_context,
5290 FMODE_WRITE))
5291 return false;
5292 rpc_restart_call_prepare(task);
5293 return true;
5294 }
5295
5296 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5297 {
5298 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5299 return -EAGAIN;
5300 if (nfs4_write_stateid_changed(task, &hdr->args))
5301 return -EAGAIN;
5302 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5303 nfs4_write_done_cb(task, hdr);
5304 }
5305
5306 static
5307 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5308 {
5309 /* Don't request attributes for pNFS or O_DIRECT writes */
5310 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5311 return false;
5312 /* Otherwise, request attributes if and only if we don't hold
5313 * a delegation
5314 */
5315 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5316 }
5317
5318 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5319 struct rpc_message *msg,
5320 struct rpc_clnt **clnt)
5321 {
5322 struct nfs_server *server = NFS_SERVER(hdr->inode);
5323
5324 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5325 hdr->args.bitmask = NULL;
5326 hdr->res.fattr = NULL;
5327 } else
5328 hdr->args.bitmask = server->cache_consistency_bitmask;
5329
5330 if (!hdr->pgio_done_cb)
5331 hdr->pgio_done_cb = nfs4_write_done_cb;
5332 hdr->res.server = server;
5333 hdr->timestamp = jiffies;
5334
5335 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5336 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5337 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5338 }
5339
5340 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5341 {
5342 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5343 &data->args.seq_args,
5344 &data->res.seq_res,
5345 task);
5346 }
5347
5348 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5349 {
5350 struct inode *inode = data->inode;
5351
5352 trace_nfs4_commit(data, task->tk_status);
5353 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5354 NULL, NULL) == -EAGAIN) {
5355 rpc_restart_call_prepare(task);
5356 return -EAGAIN;
5357 }
5358 return 0;
5359 }
5360
5361 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5362 {
5363 if (!nfs4_sequence_done(task, &data->res.seq_res))
5364 return -EAGAIN;
5365 return data->commit_done_cb(task, data);
5366 }
5367
5368 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5369 struct rpc_clnt **clnt)
5370 {
5371 struct nfs_server *server = NFS_SERVER(data->inode);
5372
5373 if (data->commit_done_cb == NULL)
5374 data->commit_done_cb = nfs4_commit_done_cb;
5375 data->res.server = server;
5376 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5377 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5378 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5379 }
5380
5381 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5382 struct nfs_commitres *res)
5383 {
5384 struct inode *dst_inode = file_inode(dst);
5385 struct nfs_server *server = NFS_SERVER(dst_inode);
5386 struct rpc_message msg = {
5387 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5388 .rpc_argp = args,
5389 .rpc_resp = res,
5390 };
5391
5392 args->fh = NFS_FH(dst_inode);
5393 return nfs4_call_sync(server->client, server, &msg,
5394 &args->seq_args, &res->seq_res, 1);
5395 }
5396
5397 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5398 {
5399 struct nfs_commitargs args = {
5400 .offset = offset,
5401 .count = count,
5402 };
5403 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5404 struct nfs4_exception exception = { };
5405 int status;
5406
5407 do {
5408 status = _nfs4_proc_commit(dst, &args, res);
5409 status = nfs4_handle_exception(dst_server, status, &exception);
5410 } while (exception.retry);
5411
5412 return status;
5413 }
5414
5415 struct nfs4_renewdata {
5416 struct nfs_client *client;
5417 unsigned long timestamp;
5418 };
5419
5420 /*
5421 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5422 * standalone procedure for queueing an asynchronous RENEW.
5423 */
5424 static void nfs4_renew_release(void *calldata)
5425 {
5426 struct nfs4_renewdata *data = calldata;
5427 struct nfs_client *clp = data->client;
5428
5429 if (refcount_read(&clp->cl_count) > 1)
5430 nfs4_schedule_state_renewal(clp);
5431 nfs_put_client(clp);
5432 kfree(data);
5433 }
5434
5435 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5436 {
5437 struct nfs4_renewdata *data = calldata;
5438 struct nfs_client *clp = data->client;
5439 unsigned long timestamp = data->timestamp;
5440
5441 trace_nfs4_renew_async(clp, task->tk_status);
5442 switch (task->tk_status) {
5443 case 0:
5444 break;
5445 case -NFS4ERR_LEASE_MOVED:
5446 nfs4_schedule_lease_moved_recovery(clp);
5447 break;
5448 default:
5449 /* Unless we're shutting down, schedule state recovery! */
5450 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5451 return;
5452 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5453 nfs4_schedule_lease_recovery(clp);
5454 return;
5455 }
5456 nfs4_schedule_path_down_recovery(clp);
5457 }
5458 do_renew_lease(clp, timestamp);
5459 }
5460
5461 static const struct rpc_call_ops nfs4_renew_ops = {
5462 .rpc_call_done = nfs4_renew_done,
5463 .rpc_release = nfs4_renew_release,
5464 };
5465
5466 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5467 {
5468 struct rpc_message msg = {
5469 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5470 .rpc_argp = clp,
5471 .rpc_cred = cred,
5472 };
5473 struct nfs4_renewdata *data;
5474
5475 if (renew_flags == 0)
5476 return 0;
5477 if (!refcount_inc_not_zero(&clp->cl_count))
5478 return -EIO;
5479 data = kmalloc(sizeof(*data), GFP_NOFS);
5480 if (data == NULL) {
5481 nfs_put_client(clp);
5482 return -ENOMEM;
5483 }
5484 data->client = clp;
5485 data->timestamp = jiffies;
5486 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5487 &nfs4_renew_ops, data);
5488 }
5489
5490 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5491 {
5492 struct rpc_message msg = {
5493 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5494 .rpc_argp = clp,
5495 .rpc_cred = cred,
5496 };
5497 unsigned long now = jiffies;
5498 int status;
5499
5500 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5501 if (status < 0)
5502 return status;
5503 do_renew_lease(clp, now);
5504 return 0;
5505 }
5506
5507 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5508 {
5509 return server->caps & NFS_CAP_ACLS;
5510 }
5511
5512 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5513 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5514 * the stack.
5515 */
5516 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5517
5518 static int buf_to_pages_noslab(const void *buf, size_t buflen,
5519 struct page **pages)
5520 {
5521 struct page *newpage, **spages;
5522 int rc = 0;
5523 size_t len;
5524 spages = pages;
5525
5526 do {
5527 len = min_t(size_t, PAGE_SIZE, buflen);
5528 newpage = alloc_page(GFP_KERNEL);
5529
5530 if (newpage == NULL)
5531 goto unwind;
5532 memcpy(page_address(newpage), buf, len);
5533 buf += len;
5534 buflen -= len;
5535 *pages++ = newpage;
5536 rc++;
5537 } while (buflen != 0);
5538
5539 return rc;
5540
5541 unwind:
5542 for(; rc > 0; rc--)
5543 __free_page(spages[rc-1]);
5544 return -ENOMEM;
5545 }
5546
5547 struct nfs4_cached_acl {
5548 int cached;
5549 size_t len;
5550 char data[];
5551 };
5552
5553 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5554 {
5555 struct nfs_inode *nfsi = NFS_I(inode);
5556
5557 spin_lock(&inode->i_lock);
5558 kfree(nfsi->nfs4_acl);
5559 nfsi->nfs4_acl = acl;
5560 spin_unlock(&inode->i_lock);
5561 }
5562
5563 static void nfs4_zap_acl_attr(struct inode *inode)
5564 {
5565 nfs4_set_cached_acl(inode, NULL);
5566 }
5567
5568 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5569 {
5570 struct nfs_inode *nfsi = NFS_I(inode);
5571 struct nfs4_cached_acl *acl;
5572 int ret = -ENOENT;
5573
5574 spin_lock(&inode->i_lock);
5575 acl = nfsi->nfs4_acl;
5576 if (acl == NULL)
5577 goto out;
5578 if (buf == NULL) /* user is just asking for length */
5579 goto out_len;
5580 if (acl->cached == 0)
5581 goto out;
5582 ret = -ERANGE; /* see getxattr(2) man page */
5583 if (acl->len > buflen)
5584 goto out;
5585 memcpy(buf, acl->data, acl->len);
5586 out_len:
5587 ret = acl->len;
5588 out:
5589 spin_unlock(&inode->i_lock);
5590 return ret;
5591 }
5592
5593 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5594 {
5595 struct nfs4_cached_acl *acl;
5596 size_t buflen = sizeof(*acl) + acl_len;
5597
5598 if (buflen <= PAGE_SIZE) {
5599 acl = kmalloc(buflen, GFP_KERNEL);
5600 if (acl == NULL)
5601 goto out;
5602 acl->cached = 1;
5603 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5604 } else {
5605 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5606 if (acl == NULL)
5607 goto out;
5608 acl->cached = 0;
5609 }
5610 acl->len = acl_len;
5611 out:
5612 nfs4_set_cached_acl(inode, acl);
5613 }
5614
5615 /*
5616 * The getxattr API returns the required buffer length when called with a
5617 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5618 * the required buf. On a NULL buf, we send a page of data to the server
5619 * guessing that the ACL request can be serviced by a page. If so, we cache
5620 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5621 * the cache. If not so, we throw away the page, and cache the required
5622 * length. The next getxattr call will then produce another round trip to
5623 * the server, this time with the input buf of the required size.
5624 */
5625 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5626 {
5627 struct page **pages;
5628 struct nfs_getaclargs args = {
5629 .fh = NFS_FH(inode),
5630 .acl_len = buflen,
5631 };
5632 struct nfs_getaclres res = {
5633 .acl_len = buflen,
5634 };
5635 struct rpc_message msg = {
5636 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5637 .rpc_argp = &args,
5638 .rpc_resp = &res,
5639 };
5640 unsigned int npages;
5641 int ret = -ENOMEM, i;
5642 struct nfs_server *server = NFS_SERVER(inode);
5643
5644 if (buflen == 0)
5645 buflen = server->rsize;
5646
5647 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5648 pages = kmalloc_array(npages, sizeof(struct page *), GFP_NOFS);
5649 if (!pages)
5650 return -ENOMEM;
5651
5652 args.acl_pages = pages;
5653
5654 for (i = 0; i < npages; i++) {
5655 pages[i] = alloc_page(GFP_KERNEL);
5656 if (!pages[i])
5657 goto out_free;
5658 }
5659
5660 /* for decoding across pages */
5661 res.acl_scratch = alloc_page(GFP_KERNEL);
5662 if (!res.acl_scratch)
5663 goto out_free;
5664
5665 args.acl_len = npages * PAGE_SIZE;
5666
5667 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
5668 __func__, buf, buflen, npages, args.acl_len);
5669 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5670 &msg, &args.seq_args, &res.seq_res, 0);
5671 if (ret)
5672 goto out_free;
5673
5674 /* Handle the case where the passed-in buffer is too short */
5675 if (res.acl_flags & NFS4_ACL_TRUNC) {
5676 /* Did the user only issue a request for the acl length? */
5677 if (buf == NULL)
5678 goto out_ok;
5679 ret = -ERANGE;
5680 goto out_free;
5681 }
5682 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5683 if (buf) {
5684 if (res.acl_len > buflen) {
5685 ret = -ERANGE;
5686 goto out_free;
5687 }
5688 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5689 }
5690 out_ok:
5691 ret = res.acl_len;
5692 out_free:
5693 for (i = 0; i < npages; i++)
5694 if (pages[i])
5695 __free_page(pages[i]);
5696 if (res.acl_scratch)
5697 __free_page(res.acl_scratch);
5698 kfree(pages);
5699 return ret;
5700 }
5701
5702 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5703 {
5704 struct nfs4_exception exception = {
5705 .interruptible = true,
5706 };
5707 ssize_t ret;
5708 do {
5709 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5710 trace_nfs4_get_acl(inode, ret);
5711 if (ret >= 0)
5712 break;
5713 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5714 } while (exception.retry);
5715 return ret;
5716 }
5717
5718 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5719 {
5720 struct nfs_server *server = NFS_SERVER(inode);
5721 int ret;
5722
5723 if (!nfs4_server_supports_acls(server))
5724 return -EOPNOTSUPP;
5725 ret = nfs_revalidate_inode(server, inode);
5726 if (ret < 0)
5727 return ret;
5728 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5729 nfs_zap_acl_cache(inode);
5730 ret = nfs4_read_cached_acl(inode, buf, buflen);
5731 if (ret != -ENOENT)
5732 /* -ENOENT is returned if there is no ACL or if there is an ACL
5733 * but no cached acl data, just the acl length */
5734 return ret;
5735 return nfs4_get_acl_uncached(inode, buf, buflen);
5736 }
5737
5738 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5739 {
5740 struct nfs_server *server = NFS_SERVER(inode);
5741 struct page *pages[NFS4ACL_MAXPAGES];
5742 struct nfs_setaclargs arg = {
5743 .fh = NFS_FH(inode),
5744 .acl_pages = pages,
5745 .acl_len = buflen,
5746 };
5747 struct nfs_setaclres res;
5748 struct rpc_message msg = {
5749 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5750 .rpc_argp = &arg,
5751 .rpc_resp = &res,
5752 };
5753 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5754 int ret, i;
5755
5756 if (!nfs4_server_supports_acls(server))
5757 return -EOPNOTSUPP;
5758 if (npages > ARRAY_SIZE(pages))
5759 return -ERANGE;
5760 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5761 if (i < 0)
5762 return i;
5763 nfs4_inode_make_writeable(inode);
5764 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5765
5766 /*
5767 * Free each page after tx, so the only ref left is
5768 * held by the network stack
5769 */
5770 for (; i > 0; i--)
5771 put_page(pages[i-1]);
5772
5773 /*
5774 * Acl update can result in inode attribute update.
5775 * so mark the attribute cache invalid.
5776 */
5777 spin_lock(&inode->i_lock);
5778 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE
5779 | NFS_INO_INVALID_CTIME
5780 | NFS_INO_REVAL_FORCED;
5781 spin_unlock(&inode->i_lock);
5782 nfs_access_zap_cache(inode);
5783 nfs_zap_acl_cache(inode);
5784 return ret;
5785 }
5786
5787 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5788 {
5789 struct nfs4_exception exception = { };
5790 int err;
5791 do {
5792 err = __nfs4_proc_set_acl(inode, buf, buflen);
5793 trace_nfs4_set_acl(inode, err);
5794 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5795 &exception);
5796 } while (exception.retry);
5797 return err;
5798 }
5799
5800 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5801 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5802 size_t buflen)
5803 {
5804 struct nfs_server *server = NFS_SERVER(inode);
5805 struct nfs_fattr fattr;
5806 struct nfs4_label label = {0, 0, buflen, buf};
5807
5808 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5809 struct nfs4_getattr_arg arg = {
5810 .fh = NFS_FH(inode),
5811 .bitmask = bitmask,
5812 };
5813 struct nfs4_getattr_res res = {
5814 .fattr = &fattr,
5815 .label = &label,
5816 .server = server,
5817 };
5818 struct rpc_message msg = {
5819 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5820 .rpc_argp = &arg,
5821 .rpc_resp = &res,
5822 };
5823 int ret;
5824
5825 nfs_fattr_init(&fattr);
5826
5827 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5828 if (ret)
5829 return ret;
5830 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5831 return -ENOENT;
5832 if (buflen < label.len)
5833 return -ERANGE;
5834 return 0;
5835 }
5836
5837 static int nfs4_get_security_label(struct inode *inode, void *buf,
5838 size_t buflen)
5839 {
5840 struct nfs4_exception exception = {
5841 .interruptible = true,
5842 };
5843 int err;
5844
5845 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5846 return -EOPNOTSUPP;
5847
5848 do {
5849 err = _nfs4_get_security_label(inode, buf, buflen);
5850 trace_nfs4_get_security_label(inode, err);
5851 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5852 &exception);
5853 } while (exception.retry);
5854 return err;
5855 }
5856
5857 static int _nfs4_do_set_security_label(struct inode *inode,
5858 struct nfs4_label *ilabel,
5859 struct nfs_fattr *fattr,
5860 struct nfs4_label *olabel)
5861 {
5862
5863 struct iattr sattr = {0};
5864 struct nfs_server *server = NFS_SERVER(inode);
5865 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5866 struct nfs_setattrargs arg = {
5867 .fh = NFS_FH(inode),
5868 .iap = &sattr,
5869 .server = server,
5870 .bitmask = bitmask,
5871 .label = ilabel,
5872 };
5873 struct nfs_setattrres res = {
5874 .fattr = fattr,
5875 .label = olabel,
5876 .server = server,
5877 };
5878 struct rpc_message msg = {
5879 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5880 .rpc_argp = &arg,
5881 .rpc_resp = &res,
5882 };
5883 int status;
5884
5885 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5886
5887 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5888 if (status)
5889 dprintk("%s failed: %d\n", __func__, status);
5890
5891 return status;
5892 }
5893
5894 static int nfs4_do_set_security_label(struct inode *inode,
5895 struct nfs4_label *ilabel,
5896 struct nfs_fattr *fattr,
5897 struct nfs4_label *olabel)
5898 {
5899 struct nfs4_exception exception = { };
5900 int err;
5901
5902 do {
5903 err = _nfs4_do_set_security_label(inode, ilabel,
5904 fattr, olabel);
5905 trace_nfs4_set_security_label(inode, err);
5906 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5907 &exception);
5908 } while (exception.retry);
5909 return err;
5910 }
5911
5912 static int
5913 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5914 {
5915 struct nfs4_label ilabel, *olabel = NULL;
5916 struct nfs_fattr fattr;
5917 int status;
5918
5919 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5920 return -EOPNOTSUPP;
5921
5922 nfs_fattr_init(&fattr);
5923
5924 ilabel.pi = 0;
5925 ilabel.lfs = 0;
5926 ilabel.label = (char *)buf;
5927 ilabel.len = buflen;
5928
5929 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5930 if (IS_ERR(olabel)) {
5931 status = -PTR_ERR(olabel);
5932 goto out;
5933 }
5934
5935 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5936 if (status == 0)
5937 nfs_setsecurity(inode, &fattr, olabel);
5938
5939 nfs4_label_free(olabel);
5940 out:
5941 return status;
5942 }
5943 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
5944
5945
5946 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5947 nfs4_verifier *bootverf)
5948 {
5949 __be32 verf[2];
5950
5951 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5952 /* An impossible timestamp guarantees this value
5953 * will never match a generated boot time. */
5954 verf[0] = cpu_to_be32(U32_MAX);
5955 verf[1] = cpu_to_be32(U32_MAX);
5956 } else {
5957 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5958 u64 ns = ktime_to_ns(nn->boot_time);
5959
5960 verf[0] = cpu_to_be32(ns >> 32);
5961 verf[1] = cpu_to_be32(ns);
5962 }
5963 memcpy(bootverf->data, verf, sizeof(bootverf->data));
5964 }
5965
5966 static int
5967 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5968 {
5969 size_t len;
5970 char *str;
5971
5972 if (clp->cl_owner_id != NULL)
5973 return 0;
5974
5975 rcu_read_lock();
5976 len = 14 +
5977 strlen(clp->cl_rpcclient->cl_nodename) +
5978 1 +
5979 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5980 1;
5981 rcu_read_unlock();
5982 if (nfs4_client_id_uniquifier[0] != '\0')
5983 len += strlen(nfs4_client_id_uniquifier) + 1;
5984 if (len > NFS4_OPAQUE_LIMIT + 1)
5985 return -EINVAL;
5986
5987 /*
5988 * Since this string is allocated at mount time, and held until the
5989 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5990 * about a memory-reclaim deadlock.
5991 */
5992 str = kmalloc(len, GFP_KERNEL);
5993 if (!str)
5994 return -ENOMEM;
5995
5996 rcu_read_lock();
5997 if (nfs4_client_id_uniquifier[0] != '\0')
5998 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
5999 clp->cl_rpcclient->cl_nodename,
6000 nfs4_client_id_uniquifier,
6001 rpc_peeraddr2str(clp->cl_rpcclient,
6002 RPC_DISPLAY_ADDR));
6003 else
6004 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6005 clp->cl_rpcclient->cl_nodename,
6006 rpc_peeraddr2str(clp->cl_rpcclient,
6007 RPC_DISPLAY_ADDR));
6008 rcu_read_unlock();
6009
6010 clp->cl_owner_id = str;
6011 return 0;
6012 }
6013
6014 static int
6015 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
6016 {
6017 size_t len;
6018 char *str;
6019
6020 len = 10 + 10 + 1 + 10 + 1 +
6021 strlen(nfs4_client_id_uniquifier) + 1 +
6022 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6023
6024 if (len > NFS4_OPAQUE_LIMIT + 1)
6025 return -EINVAL;
6026
6027 /*
6028 * Since this string is allocated at mount time, and held until the
6029 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6030 * about a memory-reclaim deadlock.
6031 */
6032 str = kmalloc(len, GFP_KERNEL);
6033 if (!str)
6034 return -ENOMEM;
6035
6036 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6037 clp->rpc_ops->version, clp->cl_minorversion,
6038 nfs4_client_id_uniquifier,
6039 clp->cl_rpcclient->cl_nodename);
6040 clp->cl_owner_id = str;
6041 return 0;
6042 }
6043
6044 static int
6045 nfs4_init_uniform_client_string(struct nfs_client *clp)
6046 {
6047 size_t len;
6048 char *str;
6049
6050 if (clp->cl_owner_id != NULL)
6051 return 0;
6052
6053 if (nfs4_client_id_uniquifier[0] != '\0')
6054 return nfs4_init_uniquifier_client_string(clp);
6055
6056 len = 10 + 10 + 1 + 10 + 1 +
6057 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6058
6059 if (len > NFS4_OPAQUE_LIMIT + 1)
6060 return -EINVAL;
6061
6062 /*
6063 * Since this string is allocated at mount time, and held until the
6064 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6065 * about a memory-reclaim deadlock.
6066 */
6067 str = kmalloc(len, GFP_KERNEL);
6068 if (!str)
6069 return -ENOMEM;
6070
6071 scnprintf(str, len, "Linux NFSv%u.%u %s",
6072 clp->rpc_ops->version, clp->cl_minorversion,
6073 clp->cl_rpcclient->cl_nodename);
6074 clp->cl_owner_id = str;
6075 return 0;
6076 }
6077
6078 /*
6079 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6080 * services. Advertise one based on the address family of the
6081 * clientaddr.
6082 */
6083 static unsigned int
6084 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6085 {
6086 if (strchr(clp->cl_ipaddr, ':') != NULL)
6087 return scnprintf(buf, len, "tcp6");
6088 else
6089 return scnprintf(buf, len, "tcp");
6090 }
6091
6092 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6093 {
6094 struct nfs4_setclientid *sc = calldata;
6095
6096 if (task->tk_status == 0)
6097 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6098 }
6099
6100 static const struct rpc_call_ops nfs4_setclientid_ops = {
6101 .rpc_call_done = nfs4_setclientid_done,
6102 };
6103
6104 /**
6105 * nfs4_proc_setclientid - Negotiate client ID
6106 * @clp: state data structure
6107 * @program: RPC program for NFSv4 callback service
6108 * @port: IP port number for NFS4 callback service
6109 * @cred: credential to use for this call
6110 * @res: where to place the result
6111 *
6112 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6113 */
6114 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6115 unsigned short port, const struct cred *cred,
6116 struct nfs4_setclientid_res *res)
6117 {
6118 nfs4_verifier sc_verifier;
6119 struct nfs4_setclientid setclientid = {
6120 .sc_verifier = &sc_verifier,
6121 .sc_prog = program,
6122 .sc_clnt = clp,
6123 };
6124 struct rpc_message msg = {
6125 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6126 .rpc_argp = &setclientid,
6127 .rpc_resp = res,
6128 .rpc_cred = cred,
6129 };
6130 struct rpc_task_setup task_setup_data = {
6131 .rpc_client = clp->cl_rpcclient,
6132 .rpc_message = &msg,
6133 .callback_ops = &nfs4_setclientid_ops,
6134 .callback_data = &setclientid,
6135 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6136 };
6137 unsigned long now = jiffies;
6138 int status;
6139
6140 /* nfs_client_id4 */
6141 nfs4_init_boot_verifier(clp, &sc_verifier);
6142
6143 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6144 status = nfs4_init_uniform_client_string(clp);
6145 else
6146 status = nfs4_init_nonuniform_client_string(clp);
6147
6148 if (status)
6149 goto out;
6150
6151 /* cb_client4 */
6152 setclientid.sc_netid_len =
6153 nfs4_init_callback_netid(clp,
6154 setclientid.sc_netid,
6155 sizeof(setclientid.sc_netid));
6156 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6157 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6158 clp->cl_ipaddr, port >> 8, port & 255);
6159
6160 dprintk("NFS call setclientid auth=%s, '%s'\n",
6161 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6162 clp->cl_owner_id);
6163
6164 status = nfs4_call_sync_custom(&task_setup_data);
6165 if (setclientid.sc_cred) {
6166 kfree(clp->cl_acceptor);
6167 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6168 put_rpccred(setclientid.sc_cred);
6169 }
6170
6171 if (status == 0)
6172 do_renew_lease(clp, now);
6173 out:
6174 trace_nfs4_setclientid(clp, status);
6175 dprintk("NFS reply setclientid: %d\n", status);
6176 return status;
6177 }
6178
6179 /**
6180 * nfs4_proc_setclientid_confirm - Confirm client ID
6181 * @clp: state data structure
6182 * @arg: result of a previous SETCLIENTID
6183 * @cred: credential to use for this call
6184 *
6185 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6186 */
6187 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6188 struct nfs4_setclientid_res *arg,
6189 const struct cred *cred)
6190 {
6191 struct rpc_message msg = {
6192 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6193 .rpc_argp = arg,
6194 .rpc_cred = cred,
6195 };
6196 int status;
6197
6198 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
6199 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6200 clp->cl_clientid);
6201 status = rpc_call_sync(clp->cl_rpcclient, &msg,
6202 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6203 trace_nfs4_setclientid_confirm(clp, status);
6204 dprintk("NFS reply setclientid_confirm: %d\n", status);
6205 return status;
6206 }
6207
6208 struct nfs4_delegreturndata {
6209 struct nfs4_delegreturnargs args;
6210 struct nfs4_delegreturnres res;
6211 struct nfs_fh fh;
6212 nfs4_stateid stateid;
6213 unsigned long timestamp;
6214 struct {
6215 struct nfs4_layoutreturn_args arg;
6216 struct nfs4_layoutreturn_res res;
6217 struct nfs4_xdr_opaque_data ld_private;
6218 u32 roc_barrier;
6219 bool roc;
6220 } lr;
6221 struct nfs_fattr fattr;
6222 int rpc_status;
6223 struct inode *inode;
6224 };
6225
6226 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6227 {
6228 struct nfs4_delegreturndata *data = calldata;
6229 struct nfs4_exception exception = {
6230 .inode = data->inode,
6231 .stateid = &data->stateid,
6232 };
6233
6234 if (!nfs4_sequence_done(task, &data->res.seq_res))
6235 return;
6236
6237 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6238
6239 /* Handle Layoutreturn errors */
6240 if (pnfs_roc_done(task, data->inode,
6241 &data->args.lr_args,
6242 &data->res.lr_res,
6243 &data->res.lr_ret) == -EAGAIN)
6244 goto out_restart;
6245
6246 switch (task->tk_status) {
6247 case 0:
6248 renew_lease(data->res.server, data->timestamp);
6249 break;
6250 case -NFS4ERR_ADMIN_REVOKED:
6251 case -NFS4ERR_DELEG_REVOKED:
6252 case -NFS4ERR_EXPIRED:
6253 nfs4_free_revoked_stateid(data->res.server,
6254 data->args.stateid,
6255 task->tk_msg.rpc_cred);
6256 /* Fallthrough */
6257 case -NFS4ERR_BAD_STATEID:
6258 case -NFS4ERR_STALE_STATEID:
6259 case -ETIMEDOUT:
6260 task->tk_status = 0;
6261 break;
6262 case -NFS4ERR_OLD_STATEID:
6263 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6264 nfs4_stateid_seqid_inc(&data->stateid);
6265 if (data->args.bitmask) {
6266 data->args.bitmask = NULL;
6267 data->res.fattr = NULL;
6268 }
6269 goto out_restart;
6270 case -NFS4ERR_ACCESS:
6271 if (data->args.bitmask) {
6272 data->args.bitmask = NULL;
6273 data->res.fattr = NULL;
6274 goto out_restart;
6275 }
6276 /* Fallthrough */
6277 default:
6278 task->tk_status = nfs4_async_handle_exception(task,
6279 data->res.server, task->tk_status,
6280 &exception);
6281 if (exception.retry)
6282 goto out_restart;
6283 }
6284 nfs_delegation_mark_returned(data->inode, data->args.stateid);
6285 data->rpc_status = task->tk_status;
6286 return;
6287 out_restart:
6288 task->tk_status = 0;
6289 rpc_restart_call_prepare(task);
6290 }
6291
6292 static void nfs4_delegreturn_release(void *calldata)
6293 {
6294 struct nfs4_delegreturndata *data = calldata;
6295 struct inode *inode = data->inode;
6296
6297 if (inode) {
6298 if (data->lr.roc)
6299 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6300 data->res.lr_ret);
6301 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
6302 nfs_iput_and_deactive(inode);
6303 }
6304 kfree(calldata);
6305 }
6306
6307 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6308 {
6309 struct nfs4_delegreturndata *d_data;
6310 struct pnfs_layout_hdr *lo;
6311
6312 d_data = (struct nfs4_delegreturndata *)data;
6313
6314 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6315 nfs4_sequence_done(task, &d_data->res.seq_res);
6316 return;
6317 }
6318
6319 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6320 if (lo && !pnfs_layout_is_valid(lo)) {
6321 d_data->args.lr_args = NULL;
6322 d_data->res.lr_res = NULL;
6323 }
6324
6325 nfs4_setup_sequence(d_data->res.server->nfs_client,
6326 &d_data->args.seq_args,
6327 &d_data->res.seq_res,
6328 task);
6329 }
6330
6331 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6332 .rpc_call_prepare = nfs4_delegreturn_prepare,
6333 .rpc_call_done = nfs4_delegreturn_done,
6334 .rpc_release = nfs4_delegreturn_release,
6335 };
6336
6337 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6338 {
6339 struct nfs4_delegreturndata *data;
6340 struct nfs_server *server = NFS_SERVER(inode);
6341 struct rpc_task *task;
6342 struct rpc_message msg = {
6343 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6344 .rpc_cred = cred,
6345 };
6346 struct rpc_task_setup task_setup_data = {
6347 .rpc_client = server->client,
6348 .rpc_message = &msg,
6349 .callback_ops = &nfs4_delegreturn_ops,
6350 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6351 };
6352 int status = 0;
6353
6354 data = kzalloc(sizeof(*data), GFP_NOFS);
6355 if (data == NULL)
6356 return -ENOMEM;
6357 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
6358
6359 nfs4_state_protect(server->nfs_client,
6360 NFS_SP4_MACH_CRED_CLEANUP,
6361 &task_setup_data.rpc_client, &msg);
6362
6363 data->args.fhandle = &data->fh;
6364 data->args.stateid = &data->stateid;
6365 data->args.bitmask = server->cache_consistency_bitmask;
6366 nfs_copy_fh(&data->fh, NFS_FH(inode));
6367 nfs4_stateid_copy(&data->stateid, stateid);
6368 data->res.fattr = &data->fattr;
6369 data->res.server = server;
6370 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6371 data->lr.arg.ld_private = &data->lr.ld_private;
6372 nfs_fattr_init(data->res.fattr);
6373 data->timestamp = jiffies;
6374 data->rpc_status = 0;
6375 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
6376 data->inode = nfs_igrab_and_active(inode);
6377 if (data->inode) {
6378 if (data->lr.roc) {
6379 data->args.lr_args = &data->lr.arg;
6380 data->res.lr_res = &data->lr.res;
6381 }
6382 } else if (data->lr.roc) {
6383 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
6384 data->lr.roc = false;
6385 }
6386
6387 task_setup_data.callback_data = data;
6388 msg.rpc_argp = &data->args;
6389 msg.rpc_resp = &data->res;
6390 task = rpc_run_task(&task_setup_data);
6391 if (IS_ERR(task))
6392 return PTR_ERR(task);
6393 if (!issync)
6394 goto out;
6395 status = rpc_wait_for_completion_task(task);
6396 if (status != 0)
6397 goto out;
6398 status = data->rpc_status;
6399 out:
6400 rpc_put_task(task);
6401 return status;
6402 }
6403
6404 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6405 {
6406 struct nfs_server *server = NFS_SERVER(inode);
6407 struct nfs4_exception exception = { };
6408 int err;
6409 do {
6410 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6411 trace_nfs4_delegreturn(inode, stateid, err);
6412 switch (err) {
6413 case -NFS4ERR_STALE_STATEID:
6414 case -NFS4ERR_EXPIRED:
6415 case 0:
6416 return 0;
6417 }
6418 err = nfs4_handle_exception(server, err, &exception);
6419 } while (exception.retry);
6420 return err;
6421 }
6422
6423 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6424 {
6425 struct inode *inode = state->inode;
6426 struct nfs_server *server = NFS_SERVER(inode);
6427 struct nfs_client *clp = server->nfs_client;
6428 struct nfs_lockt_args arg = {
6429 .fh = NFS_FH(inode),
6430 .fl = request,
6431 };
6432 struct nfs_lockt_res res = {
6433 .denied = request,
6434 };
6435 struct rpc_message msg = {
6436 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6437 .rpc_argp = &arg,
6438 .rpc_resp = &res,
6439 .rpc_cred = state->owner->so_cred,
6440 };
6441 struct nfs4_lock_state *lsp;
6442 int status;
6443
6444 arg.lock_owner.clientid = clp->cl_clientid;
6445 status = nfs4_set_lock_state(state, request);
6446 if (status != 0)
6447 goto out;
6448 lsp = request->fl_u.nfs4_fl.owner;
6449 arg.lock_owner.id = lsp->ls_seqid.owner_id;
6450 arg.lock_owner.s_dev = server->s_dev;
6451 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6452 switch (status) {
6453 case 0:
6454 request->fl_type = F_UNLCK;
6455 break;
6456 case -NFS4ERR_DENIED:
6457 status = 0;
6458 }
6459 request->fl_ops->fl_release_private(request);
6460 request->fl_ops = NULL;
6461 out:
6462 return status;
6463 }
6464
6465 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6466 {
6467 struct nfs4_exception exception = {
6468 .interruptible = true,
6469 };
6470 int err;
6471
6472 do {
6473 err = _nfs4_proc_getlk(state, cmd, request);
6474 trace_nfs4_get_lock(request, state, cmd, err);
6475 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6476 &exception);
6477 } while (exception.retry);
6478 return err;
6479 }
6480
6481 /*
6482 * Update the seqid of a lock stateid after receiving
6483 * NFS4ERR_OLD_STATEID
6484 */
6485 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6486 struct nfs4_lock_state *lsp)
6487 {
6488 struct nfs4_state *state = lsp->ls_state;
6489 bool ret = false;
6490
6491 spin_lock(&state->state_lock);
6492 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6493 goto out;
6494 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6495 nfs4_stateid_seqid_inc(dst);
6496 else
6497 dst->seqid = lsp->ls_stateid.seqid;
6498 ret = true;
6499 out:
6500 spin_unlock(&state->state_lock);
6501 return ret;
6502 }
6503
6504 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6505 struct nfs4_lock_state *lsp)
6506 {
6507 struct nfs4_state *state = lsp->ls_state;
6508 bool ret;
6509
6510 spin_lock(&state->state_lock);
6511 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6512 nfs4_stateid_copy(dst, &lsp->ls_stateid);
6513 spin_unlock(&state->state_lock);
6514 return ret;
6515 }
6516
6517 struct nfs4_unlockdata {
6518 struct nfs_locku_args arg;
6519 struct nfs_locku_res res;
6520 struct nfs4_lock_state *lsp;
6521 struct nfs_open_context *ctx;
6522 struct nfs_lock_context *l_ctx;
6523 struct file_lock fl;
6524 struct nfs_server *server;
6525 unsigned long timestamp;
6526 };
6527
6528 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6529 struct nfs_open_context *ctx,
6530 struct nfs4_lock_state *lsp,
6531 struct nfs_seqid *seqid)
6532 {
6533 struct nfs4_unlockdata *p;
6534 struct nfs4_state *state = lsp->ls_state;
6535 struct inode *inode = state->inode;
6536
6537 p = kzalloc(sizeof(*p), GFP_NOFS);
6538 if (p == NULL)
6539 return NULL;
6540 p->arg.fh = NFS_FH(inode);
6541 p->arg.fl = &p->fl;
6542 p->arg.seqid = seqid;
6543 p->res.seqid = seqid;
6544 p->lsp = lsp;
6545 /* Ensure we don't close file until we're done freeing locks! */
6546 p->ctx = get_nfs_open_context(ctx);
6547 p->l_ctx = nfs_get_lock_context(ctx);
6548 locks_init_lock(&p->fl);
6549 locks_copy_lock(&p->fl, fl);
6550 p->server = NFS_SERVER(inode);
6551 spin_lock(&state->state_lock);
6552 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6553 spin_unlock(&state->state_lock);
6554 return p;
6555 }
6556
6557 static void nfs4_locku_release_calldata(void *data)
6558 {
6559 struct nfs4_unlockdata *calldata = data;
6560 nfs_free_seqid(calldata->arg.seqid);
6561 nfs4_put_lock_state(calldata->lsp);
6562 nfs_put_lock_context(calldata->l_ctx);
6563 put_nfs_open_context(calldata->ctx);
6564 kfree(calldata);
6565 }
6566
6567 static void nfs4_locku_done(struct rpc_task *task, void *data)
6568 {
6569 struct nfs4_unlockdata *calldata = data;
6570 struct nfs4_exception exception = {
6571 .inode = calldata->lsp->ls_state->inode,
6572 .stateid = &calldata->arg.stateid,
6573 };
6574
6575 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6576 return;
6577 switch (task->tk_status) {
6578 case 0:
6579 renew_lease(calldata->server, calldata->timestamp);
6580 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6581 if (nfs4_update_lock_stateid(calldata->lsp,
6582 &calldata->res.stateid))
6583 break;
6584 /* Fall through */
6585 case -NFS4ERR_ADMIN_REVOKED:
6586 case -NFS4ERR_EXPIRED:
6587 nfs4_free_revoked_stateid(calldata->server,
6588 &calldata->arg.stateid,
6589 task->tk_msg.rpc_cred);
6590 /* Fall through */
6591 case -NFS4ERR_BAD_STATEID:
6592 case -NFS4ERR_STALE_STATEID:
6593 if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6594 calldata->lsp))
6595 rpc_restart_call_prepare(task);
6596 break;
6597 case -NFS4ERR_OLD_STATEID:
6598 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6599 calldata->lsp))
6600 rpc_restart_call_prepare(task);
6601 break;
6602 default:
6603 task->tk_status = nfs4_async_handle_exception(task,
6604 calldata->server, task->tk_status,
6605 &exception);
6606 if (exception.retry)
6607 rpc_restart_call_prepare(task);
6608 }
6609 nfs_release_seqid(calldata->arg.seqid);
6610 }
6611
6612 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6613 {
6614 struct nfs4_unlockdata *calldata = data;
6615
6616 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6617 nfs_async_iocounter_wait(task, calldata->l_ctx))
6618 return;
6619
6620 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6621 goto out_wait;
6622 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6623 /* Note: exit _without_ running nfs4_locku_done */
6624 goto out_no_action;
6625 }
6626 calldata->timestamp = jiffies;
6627 if (nfs4_setup_sequence(calldata->server->nfs_client,
6628 &calldata->arg.seq_args,
6629 &calldata->res.seq_res,
6630 task) != 0)
6631 nfs_release_seqid(calldata->arg.seqid);
6632 return;
6633 out_no_action:
6634 task->tk_action = NULL;
6635 out_wait:
6636 nfs4_sequence_done(task, &calldata->res.seq_res);
6637 }
6638
6639 static const struct rpc_call_ops nfs4_locku_ops = {
6640 .rpc_call_prepare = nfs4_locku_prepare,
6641 .rpc_call_done = nfs4_locku_done,
6642 .rpc_release = nfs4_locku_release_calldata,
6643 };
6644
6645 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6646 struct nfs_open_context *ctx,
6647 struct nfs4_lock_state *lsp,
6648 struct nfs_seqid *seqid)
6649 {
6650 struct nfs4_unlockdata *data;
6651 struct rpc_message msg = {
6652 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6653 .rpc_cred = ctx->cred,
6654 };
6655 struct rpc_task_setup task_setup_data = {
6656 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6657 .rpc_message = &msg,
6658 .callback_ops = &nfs4_locku_ops,
6659 .workqueue = nfsiod_workqueue,
6660 .flags = RPC_TASK_ASYNC,
6661 };
6662
6663 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6664 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6665
6666 /* Ensure this is an unlock - when canceling a lock, the
6667 * canceled lock is passed in, and it won't be an unlock.
6668 */
6669 fl->fl_type = F_UNLCK;
6670 if (fl->fl_flags & FL_CLOSE)
6671 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6672
6673 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6674 if (data == NULL) {
6675 nfs_free_seqid(seqid);
6676 return ERR_PTR(-ENOMEM);
6677 }
6678
6679 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6680 msg.rpc_argp = &data->arg;
6681 msg.rpc_resp = &data->res;
6682 task_setup_data.callback_data = data;
6683 return rpc_run_task(&task_setup_data);
6684 }
6685
6686 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6687 {
6688 struct inode *inode = state->inode;
6689 struct nfs4_state_owner *sp = state->owner;
6690 struct nfs_inode *nfsi = NFS_I(inode);
6691 struct nfs_seqid *seqid;
6692 struct nfs4_lock_state *lsp;
6693 struct rpc_task *task;
6694 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6695 int status = 0;
6696 unsigned char fl_flags = request->fl_flags;
6697
6698 status = nfs4_set_lock_state(state, request);
6699 /* Unlock _before_ we do the RPC call */
6700 request->fl_flags |= FL_EXISTS;
6701 /* Exclude nfs_delegation_claim_locks() */
6702 mutex_lock(&sp->so_delegreturn_mutex);
6703 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6704 down_read(&nfsi->rwsem);
6705 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6706 up_read(&nfsi->rwsem);
6707 mutex_unlock(&sp->so_delegreturn_mutex);
6708 goto out;
6709 }
6710 up_read(&nfsi->rwsem);
6711 mutex_unlock(&sp->so_delegreturn_mutex);
6712 if (status != 0)
6713 goto out;
6714 /* Is this a delegated lock? */
6715 lsp = request->fl_u.nfs4_fl.owner;
6716 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6717 goto out;
6718 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6719 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6720 status = -ENOMEM;
6721 if (IS_ERR(seqid))
6722 goto out;
6723 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6724 status = PTR_ERR(task);
6725 if (IS_ERR(task))
6726 goto out;
6727 status = rpc_wait_for_completion_task(task);
6728 rpc_put_task(task);
6729 out:
6730 request->fl_flags = fl_flags;
6731 trace_nfs4_unlock(request, state, F_SETLK, status);
6732 return status;
6733 }
6734
6735 struct nfs4_lockdata {
6736 struct nfs_lock_args arg;
6737 struct nfs_lock_res res;
6738 struct nfs4_lock_state *lsp;
6739 struct nfs_open_context *ctx;
6740 struct file_lock fl;
6741 unsigned long timestamp;
6742 int rpc_status;
6743 int cancelled;
6744 struct nfs_server *server;
6745 };
6746
6747 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6748 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6749 gfp_t gfp_mask)
6750 {
6751 struct nfs4_lockdata *p;
6752 struct inode *inode = lsp->ls_state->inode;
6753 struct nfs_server *server = NFS_SERVER(inode);
6754 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6755
6756 p = kzalloc(sizeof(*p), gfp_mask);
6757 if (p == NULL)
6758 return NULL;
6759
6760 p->arg.fh = NFS_FH(inode);
6761 p->arg.fl = &p->fl;
6762 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6763 if (IS_ERR(p->arg.open_seqid))
6764 goto out_free;
6765 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6766 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6767 if (IS_ERR(p->arg.lock_seqid))
6768 goto out_free_seqid;
6769 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6770 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6771 p->arg.lock_owner.s_dev = server->s_dev;
6772 p->res.lock_seqid = p->arg.lock_seqid;
6773 p->lsp = lsp;
6774 p->server = server;
6775 p->ctx = get_nfs_open_context(ctx);
6776 locks_init_lock(&p->fl);
6777 locks_copy_lock(&p->fl, fl);
6778 return p;
6779 out_free_seqid:
6780 nfs_free_seqid(p->arg.open_seqid);
6781 out_free:
6782 kfree(p);
6783 return NULL;
6784 }
6785
6786 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6787 {
6788 struct nfs4_lockdata *data = calldata;
6789 struct nfs4_state *state = data->lsp->ls_state;
6790
6791 dprintk("%s: begin!\n", __func__);
6792 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6793 goto out_wait;
6794 /* Do we need to do an open_to_lock_owner? */
6795 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6796 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6797 goto out_release_lock_seqid;
6798 }
6799 nfs4_stateid_copy(&data->arg.open_stateid,
6800 &state->open_stateid);
6801 data->arg.new_lock_owner = 1;
6802 data->res.open_seqid = data->arg.open_seqid;
6803 } else {
6804 data->arg.new_lock_owner = 0;
6805 nfs4_stateid_copy(&data->arg.lock_stateid,
6806 &data->lsp->ls_stateid);
6807 }
6808 if (!nfs4_valid_open_stateid(state)) {
6809 data->rpc_status = -EBADF;
6810 task->tk_action = NULL;
6811 goto out_release_open_seqid;
6812 }
6813 data->timestamp = jiffies;
6814 if (nfs4_setup_sequence(data->server->nfs_client,
6815 &data->arg.seq_args,
6816 &data->res.seq_res,
6817 task) == 0)
6818 return;
6819 out_release_open_seqid:
6820 nfs_release_seqid(data->arg.open_seqid);
6821 out_release_lock_seqid:
6822 nfs_release_seqid(data->arg.lock_seqid);
6823 out_wait:
6824 nfs4_sequence_done(task, &data->res.seq_res);
6825 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6826 }
6827
6828 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6829 {
6830 struct nfs4_lockdata *data = calldata;
6831 struct nfs4_lock_state *lsp = data->lsp;
6832
6833 dprintk("%s: begin!\n", __func__);
6834
6835 if (!nfs4_sequence_done(task, &data->res.seq_res))
6836 return;
6837
6838 data->rpc_status = task->tk_status;
6839 switch (task->tk_status) {
6840 case 0:
6841 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6842 data->timestamp);
6843 if (data->arg.new_lock && !data->cancelled) {
6844 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6845 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
6846 goto out_restart;
6847 }
6848 if (data->arg.new_lock_owner != 0) {
6849 nfs_confirm_seqid(&lsp->ls_seqid, 0);
6850 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6851 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6852 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
6853 goto out_restart;
6854 break;
6855 case -NFS4ERR_BAD_STATEID:
6856 case -NFS4ERR_OLD_STATEID:
6857 case -NFS4ERR_STALE_STATEID:
6858 case -NFS4ERR_EXPIRED:
6859 if (data->arg.new_lock_owner != 0) {
6860 if (!nfs4_stateid_match(&data->arg.open_stateid,
6861 &lsp->ls_state->open_stateid))
6862 goto out_restart;
6863 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
6864 &lsp->ls_stateid))
6865 goto out_restart;
6866 }
6867 out_done:
6868 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
6869 return;
6870 out_restart:
6871 if (!data->cancelled)
6872 rpc_restart_call_prepare(task);
6873 goto out_done;
6874 }
6875
6876 static void nfs4_lock_release(void *calldata)
6877 {
6878 struct nfs4_lockdata *data = calldata;
6879
6880 dprintk("%s: begin!\n", __func__);
6881 nfs_free_seqid(data->arg.open_seqid);
6882 if (data->cancelled && data->rpc_status == 0) {
6883 struct rpc_task *task;
6884 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6885 data->arg.lock_seqid);
6886 if (!IS_ERR(task))
6887 rpc_put_task_async(task);
6888 dprintk("%s: cancelling lock!\n", __func__);
6889 } else
6890 nfs_free_seqid(data->arg.lock_seqid);
6891 nfs4_put_lock_state(data->lsp);
6892 put_nfs_open_context(data->ctx);
6893 kfree(data);
6894 dprintk("%s: done!\n", __func__);
6895 }
6896
6897 static const struct rpc_call_ops nfs4_lock_ops = {
6898 .rpc_call_prepare = nfs4_lock_prepare,
6899 .rpc_call_done = nfs4_lock_done,
6900 .rpc_release = nfs4_lock_release,
6901 };
6902
6903 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6904 {
6905 switch (error) {
6906 case -NFS4ERR_ADMIN_REVOKED:
6907 case -NFS4ERR_EXPIRED:
6908 case -NFS4ERR_BAD_STATEID:
6909 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6910 if (new_lock_owner != 0 ||
6911 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6912 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6913 break;
6914 case -NFS4ERR_STALE_STATEID:
6915 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6916 nfs4_schedule_lease_recovery(server->nfs_client);
6917 }
6918 }
6919
6920 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6921 {
6922 struct nfs4_lockdata *data;
6923 struct rpc_task *task;
6924 struct rpc_message msg = {
6925 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6926 .rpc_cred = state->owner->so_cred,
6927 };
6928 struct rpc_task_setup task_setup_data = {
6929 .rpc_client = NFS_CLIENT(state->inode),
6930 .rpc_message = &msg,
6931 .callback_ops = &nfs4_lock_ops,
6932 .workqueue = nfsiod_workqueue,
6933 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
6934 };
6935 int ret;
6936
6937 dprintk("%s: begin!\n", __func__);
6938 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6939 fl->fl_u.nfs4_fl.owner,
6940 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6941 if (data == NULL)
6942 return -ENOMEM;
6943 if (IS_SETLKW(cmd))
6944 data->arg.block = 1;
6945 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
6946 recovery_type > NFS_LOCK_NEW);
6947 msg.rpc_argp = &data->arg;
6948 msg.rpc_resp = &data->res;
6949 task_setup_data.callback_data = data;
6950 if (recovery_type > NFS_LOCK_NEW) {
6951 if (recovery_type == NFS_LOCK_RECLAIM)
6952 data->arg.reclaim = NFS_LOCK_RECLAIM;
6953 } else
6954 data->arg.new_lock = 1;
6955 task = rpc_run_task(&task_setup_data);
6956 if (IS_ERR(task))
6957 return PTR_ERR(task);
6958 ret = rpc_wait_for_completion_task(task);
6959 if (ret == 0) {
6960 ret = data->rpc_status;
6961 if (ret)
6962 nfs4_handle_setlk_error(data->server, data->lsp,
6963 data->arg.new_lock_owner, ret);
6964 } else
6965 data->cancelled = true;
6966 rpc_put_task(task);
6967 dprintk("%s: done, ret = %d!\n", __func__, ret);
6968 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
6969 return ret;
6970 }
6971
6972 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
6973 {
6974 struct nfs_server *server = NFS_SERVER(state->inode);
6975 struct nfs4_exception exception = {
6976 .inode = state->inode,
6977 };
6978 int err;
6979
6980 do {
6981 /* Cache the lock if possible... */
6982 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6983 return 0;
6984 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
6985 if (err != -NFS4ERR_DELAY)
6986 break;
6987 nfs4_handle_exception(server, err, &exception);
6988 } while (exception.retry);
6989 return err;
6990 }
6991
6992 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6993 {
6994 struct nfs_server *server = NFS_SERVER(state->inode);
6995 struct nfs4_exception exception = {
6996 .inode = state->inode,
6997 };
6998 int err;
6999
7000 err = nfs4_set_lock_state(state, request);
7001 if (err != 0)
7002 return err;
7003 if (!recover_lost_locks) {
7004 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7005 return 0;
7006 }
7007 do {
7008 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7009 return 0;
7010 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7011 switch (err) {
7012 default:
7013 goto out;
7014 case -NFS4ERR_GRACE:
7015 case -NFS4ERR_DELAY:
7016 nfs4_handle_exception(server, err, &exception);
7017 err = 0;
7018 }
7019 } while (exception.retry);
7020 out:
7021 return err;
7022 }
7023
7024 #if defined(CONFIG_NFS_V4_1)
7025 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7026 {
7027 struct nfs4_lock_state *lsp;
7028 int status;
7029
7030 status = nfs4_set_lock_state(state, request);
7031 if (status != 0)
7032 return status;
7033 lsp = request->fl_u.nfs4_fl.owner;
7034 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7035 test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7036 return 0;
7037 return nfs4_lock_expired(state, request);
7038 }
7039 #endif
7040
7041 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7042 {
7043 struct nfs_inode *nfsi = NFS_I(state->inode);
7044 struct nfs4_state_owner *sp = state->owner;
7045 unsigned char fl_flags = request->fl_flags;
7046 int status;
7047
7048 request->fl_flags |= FL_ACCESS;
7049 status = locks_lock_inode_wait(state->inode, request);
7050 if (status < 0)
7051 goto out;
7052 mutex_lock(&sp->so_delegreturn_mutex);
7053 down_read(&nfsi->rwsem);
7054 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7055 /* Yes: cache locks! */
7056 /* ...but avoid races with delegation recall... */
7057 request->fl_flags = fl_flags & ~FL_SLEEP;
7058 status = locks_lock_inode_wait(state->inode, request);
7059 up_read(&nfsi->rwsem);
7060 mutex_unlock(&sp->so_delegreturn_mutex);
7061 goto out;
7062 }
7063 up_read(&nfsi->rwsem);
7064 mutex_unlock(&sp->so_delegreturn_mutex);
7065 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7066 out:
7067 request->fl_flags = fl_flags;
7068 return status;
7069 }
7070
7071 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7072 {
7073 struct nfs4_exception exception = {
7074 .state = state,
7075 .inode = state->inode,
7076 .interruptible = true,
7077 };
7078 int err;
7079
7080 do {
7081 err = _nfs4_proc_setlk(state, cmd, request);
7082 if (err == -NFS4ERR_DENIED)
7083 err = -EAGAIN;
7084 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7085 err, &exception);
7086 } while (exception.retry);
7087 return err;
7088 }
7089
7090 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7091 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7092
7093 static int
7094 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7095 struct file_lock *request)
7096 {
7097 int status = -ERESTARTSYS;
7098 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
7099
7100 while(!signalled()) {
7101 status = nfs4_proc_setlk(state, cmd, request);
7102 if ((status != -EAGAIN) || IS_SETLK(cmd))
7103 break;
7104 freezable_schedule_timeout_interruptible(timeout);
7105 timeout *= 2;
7106 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7107 status = -ERESTARTSYS;
7108 }
7109 return status;
7110 }
7111
7112 #ifdef CONFIG_NFS_V4_1
7113 struct nfs4_lock_waiter {
7114 struct task_struct *task;
7115 struct inode *inode;
7116 struct nfs_lowner *owner;
7117 };
7118
7119 static int
7120 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7121 {
7122 int ret;
7123 struct nfs4_lock_waiter *waiter = wait->private;
7124
7125 /* NULL key means to wake up everyone */
7126 if (key) {
7127 struct cb_notify_lock_args *cbnl = key;
7128 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
7129 *wowner = waiter->owner;
7130
7131 /* Only wake if the callback was for the same owner. */
7132 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7133 return 0;
7134
7135 /* Make sure it's for the right inode */
7136 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7137 return 0;
7138 }
7139
7140 /* override "private" so we can use default_wake_function */
7141 wait->private = waiter->task;
7142 ret = woken_wake_function(wait, mode, flags, key);
7143 if (ret)
7144 list_del_init(&wait->entry);
7145 wait->private = waiter;
7146 return ret;
7147 }
7148
7149 static int
7150 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7151 {
7152 int status = -ERESTARTSYS;
7153 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7154 struct nfs_server *server = NFS_SERVER(state->inode);
7155 struct nfs_client *clp = server->nfs_client;
7156 wait_queue_head_t *q = &clp->cl_lock_waitq;
7157 struct nfs_lowner owner = { .clientid = clp->cl_clientid,
7158 .id = lsp->ls_seqid.owner_id,
7159 .s_dev = server->s_dev };
7160 struct nfs4_lock_waiter waiter = { .task = current,
7161 .inode = state->inode,
7162 .owner = &owner};
7163 wait_queue_entry_t wait;
7164
7165 /* Don't bother with waitqueue if we don't expect a callback */
7166 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7167 return nfs4_retry_setlk_simple(state, cmd, request);
7168
7169 init_wait(&wait);
7170 wait.private = &waiter;
7171 wait.func = nfs4_wake_lock_waiter;
7172
7173 while(!signalled()) {
7174 add_wait_queue(q, &wait);
7175 status = nfs4_proc_setlk(state, cmd, request);
7176 if ((status != -EAGAIN) || IS_SETLK(cmd)) {
7177 finish_wait(q, &wait);
7178 break;
7179 }
7180
7181 status = -ERESTARTSYS;
7182 freezer_do_not_count();
7183 wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
7184 freezer_count();
7185 finish_wait(q, &wait);
7186 }
7187
7188 return status;
7189 }
7190 #else /* !CONFIG_NFS_V4_1 */
7191 static inline int
7192 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7193 {
7194 return nfs4_retry_setlk_simple(state, cmd, request);
7195 }
7196 #endif
7197
7198 static int
7199 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7200 {
7201 struct nfs_open_context *ctx;
7202 struct nfs4_state *state;
7203 int status;
7204
7205 /* verify open state */
7206 ctx = nfs_file_open_context(filp);
7207 state = ctx->state;
7208
7209 if (IS_GETLK(cmd)) {
7210 if (state != NULL)
7211 return nfs4_proc_getlk(state, F_GETLK, request);
7212 return 0;
7213 }
7214
7215 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7216 return -EINVAL;
7217
7218 if (request->fl_type == F_UNLCK) {
7219 if (state != NULL)
7220 return nfs4_proc_unlck(state, cmd, request);
7221 return 0;
7222 }
7223
7224 if (state == NULL)
7225 return -ENOLCK;
7226
7227 if ((request->fl_flags & FL_POSIX) &&
7228 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7229 return -ENOLCK;
7230
7231 /*
7232 * Don't rely on the VFS having checked the file open mode,
7233 * since it won't do this for flock() locks.
7234 */
7235 switch (request->fl_type) {
7236 case F_RDLCK:
7237 if (!(filp->f_mode & FMODE_READ))
7238 return -EBADF;
7239 break;
7240 case F_WRLCK:
7241 if (!(filp->f_mode & FMODE_WRITE))
7242 return -EBADF;
7243 }
7244
7245 status = nfs4_set_lock_state(state, request);
7246 if (status != 0)
7247 return status;
7248
7249 return nfs4_retry_setlk(state, cmd, request);
7250 }
7251
7252 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7253 {
7254 struct nfs_server *server = NFS_SERVER(state->inode);
7255 int err;
7256
7257 err = nfs4_set_lock_state(state, fl);
7258 if (err != 0)
7259 return err;
7260 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7261 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7262 }
7263
7264 struct nfs_release_lockowner_data {
7265 struct nfs4_lock_state *lsp;
7266 struct nfs_server *server;
7267 struct nfs_release_lockowner_args args;
7268 struct nfs_release_lockowner_res res;
7269 unsigned long timestamp;
7270 };
7271
7272 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7273 {
7274 struct nfs_release_lockowner_data *data = calldata;
7275 struct nfs_server *server = data->server;
7276 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7277 &data->res.seq_res, task);
7278 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7279 data->timestamp = jiffies;
7280 }
7281
7282 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7283 {
7284 struct nfs_release_lockowner_data *data = calldata;
7285 struct nfs_server *server = data->server;
7286
7287 nfs40_sequence_done(task, &data->res.seq_res);
7288
7289 switch (task->tk_status) {
7290 case 0:
7291 renew_lease(server, data->timestamp);
7292 break;
7293 case -NFS4ERR_STALE_CLIENTID:
7294 case -NFS4ERR_EXPIRED:
7295 nfs4_schedule_lease_recovery(server->nfs_client);
7296 break;
7297 case -NFS4ERR_LEASE_MOVED:
7298 case -NFS4ERR_DELAY:
7299 if (nfs4_async_handle_error(task, server,
7300 NULL, NULL) == -EAGAIN)
7301 rpc_restart_call_prepare(task);
7302 }
7303 }
7304
7305 static void nfs4_release_lockowner_release(void *calldata)
7306 {
7307 struct nfs_release_lockowner_data *data = calldata;
7308 nfs4_free_lock_state(data->server, data->lsp);
7309 kfree(calldata);
7310 }
7311
7312 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7313 .rpc_call_prepare = nfs4_release_lockowner_prepare,
7314 .rpc_call_done = nfs4_release_lockowner_done,
7315 .rpc_release = nfs4_release_lockowner_release,
7316 };
7317
7318 static void
7319 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7320 {
7321 struct nfs_release_lockowner_data *data;
7322 struct rpc_message msg = {
7323 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7324 };
7325
7326 if (server->nfs_client->cl_mvops->minor_version != 0)
7327 return;
7328
7329 data = kmalloc(sizeof(*data), GFP_NOFS);
7330 if (!data)
7331 return;
7332 data->lsp = lsp;
7333 data->server = server;
7334 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7335 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7336 data->args.lock_owner.s_dev = server->s_dev;
7337
7338 msg.rpc_argp = &data->args;
7339 msg.rpc_resp = &data->res;
7340 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7341 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7342 }
7343
7344 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7345
7346 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7347 struct dentry *unused, struct inode *inode,
7348 const char *key, const void *buf,
7349 size_t buflen, int flags)
7350 {
7351 return nfs4_proc_set_acl(inode, buf, buflen);
7352 }
7353
7354 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7355 struct dentry *unused, struct inode *inode,
7356 const char *key, void *buf, size_t buflen)
7357 {
7358 return nfs4_proc_get_acl(inode, buf, buflen);
7359 }
7360
7361 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7362 {
7363 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
7364 }
7365
7366 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7367
7368 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7369 struct dentry *unused, struct inode *inode,
7370 const char *key, const void *buf,
7371 size_t buflen, int flags)
7372 {
7373 if (security_ismaclabel(key))
7374 return nfs4_set_security_label(inode, buf, buflen);
7375
7376 return -EOPNOTSUPP;
7377 }
7378
7379 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7380 struct dentry *unused, struct inode *inode,
7381 const char *key, void *buf, size_t buflen)
7382 {
7383 if (security_ismaclabel(key))
7384 return nfs4_get_security_label(inode, buf, buflen);
7385 return -EOPNOTSUPP;
7386 }
7387
7388 static ssize_t
7389 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7390 {
7391 int len = 0;
7392
7393 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7394 len = security_inode_listsecurity(inode, list, list_len);
7395 if (list_len && len > list_len)
7396 return -ERANGE;
7397 }
7398 return len;
7399 }
7400
7401 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7402 .prefix = XATTR_SECURITY_PREFIX,
7403 .get = nfs4_xattr_get_nfs4_label,
7404 .set = nfs4_xattr_set_nfs4_label,
7405 };
7406
7407 #else
7408
7409 static ssize_t
7410 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7411 {
7412 return 0;
7413 }
7414
7415 #endif
7416
7417 /*
7418 * nfs_fhget will use either the mounted_on_fileid or the fileid
7419 */
7420 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7421 {
7422 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7423 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7424 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7425 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7426 return;
7427
7428 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7429 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7430 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7431 fattr->nlink = 2;
7432 }
7433
7434 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7435 const struct qstr *name,
7436 struct nfs4_fs_locations *fs_locations,
7437 struct page *page)
7438 {
7439 struct nfs_server *server = NFS_SERVER(dir);
7440 u32 bitmask[3];
7441 struct nfs4_fs_locations_arg args = {
7442 .dir_fh = NFS_FH(dir),
7443 .name = name,
7444 .page = page,
7445 .bitmask = bitmask,
7446 };
7447 struct nfs4_fs_locations_res res = {
7448 .fs_locations = fs_locations,
7449 };
7450 struct rpc_message msg = {
7451 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7452 .rpc_argp = &args,
7453 .rpc_resp = &res,
7454 };
7455 int status;
7456
7457 dprintk("%s: start\n", __func__);
7458
7459 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7460 bitmask[1] = nfs4_fattr_bitmap[1];
7461
7462 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7463 * is not supported */
7464 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7465 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7466 else
7467 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7468
7469 nfs_fattr_init(&fs_locations->fattr);
7470 fs_locations->server = server;
7471 fs_locations->nlocations = 0;
7472 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7473 dprintk("%s: returned status = %d\n", __func__, status);
7474 return status;
7475 }
7476
7477 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7478 const struct qstr *name,
7479 struct nfs4_fs_locations *fs_locations,
7480 struct page *page)
7481 {
7482 struct nfs4_exception exception = {
7483 .interruptible = true,
7484 };
7485 int err;
7486 do {
7487 err = _nfs4_proc_fs_locations(client, dir, name,
7488 fs_locations, page);
7489 trace_nfs4_get_fs_locations(dir, name, err);
7490 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7491 &exception);
7492 } while (exception.retry);
7493 return err;
7494 }
7495
7496 /*
7497 * This operation also signals the server that this client is
7498 * performing migration recovery. The server can stop returning
7499 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
7500 * appended to this compound to identify the client ID which is
7501 * performing recovery.
7502 */
7503 static int _nfs40_proc_get_locations(struct inode *inode,
7504 struct nfs4_fs_locations *locations,
7505 struct page *page, const struct cred *cred)
7506 {
7507 struct nfs_server *server = NFS_SERVER(inode);
7508 struct rpc_clnt *clnt = server->client;
7509 u32 bitmask[2] = {
7510 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7511 };
7512 struct nfs4_fs_locations_arg args = {
7513 .clientid = server->nfs_client->cl_clientid,
7514 .fh = NFS_FH(inode),
7515 .page = page,
7516 .bitmask = bitmask,
7517 .migration = 1, /* skip LOOKUP */
7518 .renew = 1, /* append RENEW */
7519 };
7520 struct nfs4_fs_locations_res res = {
7521 .fs_locations = locations,
7522 .migration = 1,
7523 .renew = 1,
7524 };
7525 struct rpc_message msg = {
7526 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7527 .rpc_argp = &args,
7528 .rpc_resp = &res,
7529 .rpc_cred = cred,
7530 };
7531 unsigned long now = jiffies;
7532 int status;
7533
7534 nfs_fattr_init(&locations->fattr);
7535 locations->server = server;
7536 locations->nlocations = 0;
7537
7538 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7539 status = nfs4_call_sync_sequence(clnt, server, &msg,
7540 &args.seq_args, &res.seq_res);
7541 if (status)
7542 return status;
7543
7544 renew_lease(server, now);
7545 return 0;
7546 }
7547
7548 #ifdef CONFIG_NFS_V4_1
7549
7550 /*
7551 * This operation also signals the server that this client is
7552 * performing migration recovery. The server can stop asserting
7553 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
7554 * performing this operation is identified in the SEQUENCE
7555 * operation in this compound.
7556 *
7557 * When the client supports GETATTR(fs_locations_info), it can
7558 * be plumbed in here.
7559 */
7560 static int _nfs41_proc_get_locations(struct inode *inode,
7561 struct nfs4_fs_locations *locations,
7562 struct page *page, const struct cred *cred)
7563 {
7564 struct nfs_server *server = NFS_SERVER(inode);
7565 struct rpc_clnt *clnt = server->client;
7566 u32 bitmask[2] = {
7567 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7568 };
7569 struct nfs4_fs_locations_arg args = {
7570 .fh = NFS_FH(inode),
7571 .page = page,
7572 .bitmask = bitmask,
7573 .migration = 1, /* skip LOOKUP */
7574 };
7575 struct nfs4_fs_locations_res res = {
7576 .fs_locations = locations,
7577 .migration = 1,
7578 };
7579 struct rpc_message msg = {
7580 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7581 .rpc_argp = &args,
7582 .rpc_resp = &res,
7583 .rpc_cred = cred,
7584 };
7585 int status;
7586
7587 nfs_fattr_init(&locations->fattr);
7588 locations->server = server;
7589 locations->nlocations = 0;
7590
7591 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7592 status = nfs4_call_sync_sequence(clnt, server, &msg,
7593 &args.seq_args, &res.seq_res);
7594 if (status == NFS4_OK &&
7595 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7596 status = -NFS4ERR_LEASE_MOVED;
7597 return status;
7598 }
7599
7600 #endif /* CONFIG_NFS_V4_1 */
7601
7602 /**
7603 * nfs4_proc_get_locations - discover locations for a migrated FSID
7604 * @inode: inode on FSID that is migrating
7605 * @locations: result of query
7606 * @page: buffer
7607 * @cred: credential to use for this operation
7608 *
7609 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
7610 * operation failed, or a negative errno if a local error occurred.
7611 *
7612 * On success, "locations" is filled in, but if the server has
7613 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
7614 * asserted.
7615 *
7616 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
7617 * from this client that require migration recovery.
7618 */
7619 int nfs4_proc_get_locations(struct inode *inode,
7620 struct nfs4_fs_locations *locations,
7621 struct page *page, const struct cred *cred)
7622 {
7623 struct nfs_server *server = NFS_SERVER(inode);
7624 struct nfs_client *clp = server->nfs_client;
7625 const struct nfs4_mig_recovery_ops *ops =
7626 clp->cl_mvops->mig_recovery_ops;
7627 struct nfs4_exception exception = {
7628 .interruptible = true,
7629 };
7630 int status;
7631
7632 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7633 (unsigned long long)server->fsid.major,
7634 (unsigned long long)server->fsid.minor,
7635 clp->cl_hostname);
7636 nfs_display_fhandle(NFS_FH(inode), __func__);
7637
7638 do {
7639 status = ops->get_locations(inode, locations, page, cred);
7640 if (status != -NFS4ERR_DELAY)
7641 break;
7642 nfs4_handle_exception(server, status, &exception);
7643 } while (exception.retry);
7644 return status;
7645 }
7646
7647 /*
7648 * This operation also signals the server that this client is
7649 * performing "lease moved" recovery. The server can stop
7650 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
7651 * is appended to this compound to identify the client ID which is
7652 * performing recovery.
7653 */
7654 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
7655 {
7656 struct nfs_server *server = NFS_SERVER(inode);
7657 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7658 struct rpc_clnt *clnt = server->client;
7659 struct nfs4_fsid_present_arg args = {
7660 .fh = NFS_FH(inode),
7661 .clientid = clp->cl_clientid,
7662 .renew = 1, /* append RENEW */
7663 };
7664 struct nfs4_fsid_present_res res = {
7665 .renew = 1,
7666 };
7667 struct rpc_message msg = {
7668 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7669 .rpc_argp = &args,
7670 .rpc_resp = &res,
7671 .rpc_cred = cred,
7672 };
7673 unsigned long now = jiffies;
7674 int status;
7675
7676 res.fh = nfs_alloc_fhandle();
7677 if (res.fh == NULL)
7678 return -ENOMEM;
7679
7680 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7681 status = nfs4_call_sync_sequence(clnt, server, &msg,
7682 &args.seq_args, &res.seq_res);
7683 nfs_free_fhandle(res.fh);
7684 if (status)
7685 return status;
7686
7687 do_renew_lease(clp, now);
7688 return 0;
7689 }
7690
7691 #ifdef CONFIG_NFS_V4_1
7692
7693 /*
7694 * This operation also signals the server that this client is
7695 * performing "lease moved" recovery. The server can stop asserting
7696 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
7697 * this operation is identified in the SEQUENCE operation in this
7698 * compound.
7699 */
7700 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
7701 {
7702 struct nfs_server *server = NFS_SERVER(inode);
7703 struct rpc_clnt *clnt = server->client;
7704 struct nfs4_fsid_present_arg args = {
7705 .fh = NFS_FH(inode),
7706 };
7707 struct nfs4_fsid_present_res res = {
7708 };
7709 struct rpc_message msg = {
7710 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7711 .rpc_argp = &args,
7712 .rpc_resp = &res,
7713 .rpc_cred = cred,
7714 };
7715 int status;
7716
7717 res.fh = nfs_alloc_fhandle();
7718 if (res.fh == NULL)
7719 return -ENOMEM;
7720
7721 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7722 status = nfs4_call_sync_sequence(clnt, server, &msg,
7723 &args.seq_args, &res.seq_res);
7724 nfs_free_fhandle(res.fh);
7725 if (status == NFS4_OK &&
7726 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7727 status = -NFS4ERR_LEASE_MOVED;
7728 return status;
7729 }
7730
7731 #endif /* CONFIG_NFS_V4_1 */
7732
7733 /**
7734 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
7735 * @inode: inode on FSID to check
7736 * @cred: credential to use for this operation
7737 *
7738 * Server indicates whether the FSID is present, moved, or not
7739 * recognized. This operation is necessary to clear a LEASE_MOVED
7740 * condition for this client ID.
7741 *
7742 * Returns NFS4_OK if the FSID is present on this server,
7743 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
7744 * NFS4ERR code if some error occurred on the server, or a
7745 * negative errno if a local failure occurred.
7746 */
7747 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
7748 {
7749 struct nfs_server *server = NFS_SERVER(inode);
7750 struct nfs_client *clp = server->nfs_client;
7751 const struct nfs4_mig_recovery_ops *ops =
7752 clp->cl_mvops->mig_recovery_ops;
7753 struct nfs4_exception exception = {
7754 .interruptible = true,
7755 };
7756 int status;
7757
7758 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7759 (unsigned long long)server->fsid.major,
7760 (unsigned long long)server->fsid.minor,
7761 clp->cl_hostname);
7762 nfs_display_fhandle(NFS_FH(inode), __func__);
7763
7764 do {
7765 status = ops->fsid_present(inode, cred);
7766 if (status != -NFS4ERR_DELAY)
7767 break;
7768 nfs4_handle_exception(server, status, &exception);
7769 } while (exception.retry);
7770 return status;
7771 }
7772
7773 /*
7774 * If 'use_integrity' is true and the state managment nfs_client
7775 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
7776 * and the machine credential as per RFC3530bis and RFC5661 Security
7777 * Considerations sections. Otherwise, just use the user cred with the
7778 * filesystem's rpc_client.
7779 */
7780 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7781 {
7782 int status;
7783 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
7784 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
7785 struct nfs4_secinfo_arg args = {
7786 .dir_fh = NFS_FH(dir),
7787 .name = name,
7788 };
7789 struct nfs4_secinfo_res res = {
7790 .flavors = flavors,
7791 };
7792 struct rpc_message msg = {
7793 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
7794 .rpc_argp = &args,
7795 .rpc_resp = &res,
7796 };
7797 struct nfs4_call_sync_data data = {
7798 .seq_server = NFS_SERVER(dir),
7799 .seq_args = &args.seq_args,
7800 .seq_res = &res.seq_res,
7801 };
7802 struct rpc_task_setup task_setup = {
7803 .rpc_client = clnt,
7804 .rpc_message = &msg,
7805 .callback_ops = clp->cl_mvops->call_sync_ops,
7806 .callback_data = &data,
7807 .flags = RPC_TASK_NO_ROUND_ROBIN,
7808 };
7809 const struct cred *cred = NULL;
7810
7811 if (use_integrity) {
7812 clnt = clp->cl_rpcclient;
7813 task_setup.rpc_client = clnt;
7814
7815 cred = nfs4_get_clid_cred(clp);
7816 msg.rpc_cred = cred;
7817 }
7818
7819 dprintk("NFS call secinfo %s\n", name->name);
7820
7821 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
7822 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
7823 status = nfs4_call_sync_custom(&task_setup);
7824
7825 dprintk("NFS reply secinfo: %d\n", status);
7826
7827 put_cred(cred);
7828 return status;
7829 }
7830
7831 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
7832 struct nfs4_secinfo_flavors *flavors)
7833 {
7834 struct nfs4_exception exception = {
7835 .interruptible = true,
7836 };
7837 int err;
7838 do {
7839 err = -NFS4ERR_WRONGSEC;
7840
7841 /* try to use integrity protection with machine cred */
7842 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
7843 err = _nfs4_proc_secinfo(dir, name, flavors, true);
7844
7845 /*
7846 * if unable to use integrity protection, or SECINFO with
7847 * integrity protection returns NFS4ERR_WRONGSEC (which is
7848 * disallowed by spec, but exists in deployed servers) use
7849 * the current filesystem's rpc_client and the user cred.
7850 */
7851 if (err == -NFS4ERR_WRONGSEC)
7852 err = _nfs4_proc_secinfo(dir, name, flavors, false);
7853
7854 trace_nfs4_secinfo(dir, name, err);
7855 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7856 &exception);
7857 } while (exception.retry);
7858 return err;
7859 }
7860
7861 #ifdef CONFIG_NFS_V4_1
7862 /*
7863 * Check the exchange flags returned by the server for invalid flags, having
7864 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
7865 * DS flags set.
7866 */
7867 static int nfs4_check_cl_exchange_flags(u32 flags)
7868 {
7869 if (flags & ~EXCHGID4_FLAG_MASK_R)
7870 goto out_inval;
7871 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
7872 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
7873 goto out_inval;
7874 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
7875 goto out_inval;
7876 return NFS_OK;
7877 out_inval:
7878 return -NFS4ERR_INVAL;
7879 }
7880
7881 static bool
7882 nfs41_same_server_scope(struct nfs41_server_scope *a,
7883 struct nfs41_server_scope *b)
7884 {
7885 if (a->server_scope_sz != b->server_scope_sz)
7886 return false;
7887 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
7888 }
7889
7890 static void
7891 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
7892 {
7893 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
7894 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
7895 struct nfs_client *clp = args->client;
7896
7897 switch (task->tk_status) {
7898 case -NFS4ERR_BADSESSION:
7899 case -NFS4ERR_DEADSESSION:
7900 nfs4_schedule_session_recovery(clp->cl_session,
7901 task->tk_status);
7902 }
7903 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
7904 res->dir != NFS4_CDFS4_BOTH) {
7905 rpc_task_close_connection(task);
7906 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
7907 rpc_restart_call(task);
7908 }
7909 }
7910
7911 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
7912 .rpc_call_done = nfs4_bind_one_conn_to_session_done,
7913 };
7914
7915 /*
7916 * nfs4_proc_bind_one_conn_to_session()
7917 *
7918 * The 4.1 client currently uses the same TCP connection for the
7919 * fore and backchannel.
7920 */
7921 static
7922 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
7923 struct rpc_xprt *xprt,
7924 struct nfs_client *clp,
7925 const struct cred *cred)
7926 {
7927 int status;
7928 struct nfs41_bind_conn_to_session_args args = {
7929 .client = clp,
7930 .dir = NFS4_CDFC4_FORE_OR_BOTH,
7931 .retries = 0,
7932 };
7933 struct nfs41_bind_conn_to_session_res res;
7934 struct rpc_message msg = {
7935 .rpc_proc =
7936 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
7937 .rpc_argp = &args,
7938 .rpc_resp = &res,
7939 .rpc_cred = cred,
7940 };
7941 struct rpc_task_setup task_setup_data = {
7942 .rpc_client = clnt,
7943 .rpc_xprt = xprt,
7944 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
7945 .rpc_message = &msg,
7946 .flags = RPC_TASK_TIMEOUT,
7947 };
7948 struct rpc_task *task;
7949
7950 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
7951 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
7952 args.dir = NFS4_CDFC4_FORE;
7953
7954 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
7955 if (xprt != rcu_access_pointer(clnt->cl_xprt))
7956 args.dir = NFS4_CDFC4_FORE;
7957
7958 task = rpc_run_task(&task_setup_data);
7959 if (!IS_ERR(task)) {
7960 status = task->tk_status;
7961 rpc_put_task(task);
7962 } else
7963 status = PTR_ERR(task);
7964 trace_nfs4_bind_conn_to_session(clp, status);
7965 if (status == 0) {
7966 if (memcmp(res.sessionid.data,
7967 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
7968 dprintk("NFS: %s: Session ID mismatch\n", __func__);
7969 return -EIO;
7970 }
7971 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
7972 dprintk("NFS: %s: Unexpected direction from server\n",
7973 __func__);
7974 return -EIO;
7975 }
7976 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
7977 dprintk("NFS: %s: Server returned RDMA mode = true\n",
7978 __func__);
7979 return -EIO;
7980 }
7981 }
7982
7983 return status;
7984 }
7985
7986 struct rpc_bind_conn_calldata {
7987 struct nfs_client *clp;
7988 const struct cred *cred;
7989 };
7990
7991 static int
7992 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
7993 struct rpc_xprt *xprt,
7994 void *calldata)
7995 {
7996 struct rpc_bind_conn_calldata *p = calldata;
7997
7998 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
7999 }
8000
8001 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8002 {
8003 struct rpc_bind_conn_calldata data = {
8004 .clp = clp,
8005 .cred = cred,
8006 };
8007 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8008 nfs4_proc_bind_conn_to_session_callback, &data);
8009 }
8010
8011 /*
8012 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8013 * and operations we'd like to see to enable certain features in the allow map
8014 */
8015 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8016 .how = SP4_MACH_CRED,
8017 .enforce.u.words = {
8018 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8019 1 << (OP_EXCHANGE_ID - 32) |
8020 1 << (OP_CREATE_SESSION - 32) |
8021 1 << (OP_DESTROY_SESSION - 32) |
8022 1 << (OP_DESTROY_CLIENTID - 32)
8023 },
8024 .allow.u.words = {
8025 [0] = 1 << (OP_CLOSE) |
8026 1 << (OP_OPEN_DOWNGRADE) |
8027 1 << (OP_LOCKU) |
8028 1 << (OP_DELEGRETURN) |
8029 1 << (OP_COMMIT),
8030 [1] = 1 << (OP_SECINFO - 32) |
8031 1 << (OP_SECINFO_NO_NAME - 32) |
8032 1 << (OP_LAYOUTRETURN - 32) |
8033 1 << (OP_TEST_STATEID - 32) |
8034 1 << (OP_FREE_STATEID - 32) |
8035 1 << (OP_WRITE - 32)
8036 }
8037 };
8038
8039 /*
8040 * Select the state protection mode for client `clp' given the server results
8041 * from exchange_id in `sp'.
8042 *
8043 * Returns 0 on success, negative errno otherwise.
8044 */
8045 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8046 struct nfs41_state_protection *sp)
8047 {
8048 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8049 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8050 1 << (OP_EXCHANGE_ID - 32) |
8051 1 << (OP_CREATE_SESSION - 32) |
8052 1 << (OP_DESTROY_SESSION - 32) |
8053 1 << (OP_DESTROY_CLIENTID - 32)
8054 };
8055 unsigned long flags = 0;
8056 unsigned int i;
8057 int ret = 0;
8058
8059 if (sp->how == SP4_MACH_CRED) {
8060 /* Print state protect result */
8061 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8062 for (i = 0; i <= LAST_NFS4_OP; i++) {
8063 if (test_bit(i, sp->enforce.u.longs))
8064 dfprintk(MOUNT, " enforce op %d\n", i);
8065 if (test_bit(i, sp->allow.u.longs))
8066 dfprintk(MOUNT, " allow op %d\n", i);
8067 }
8068
8069 /* make sure nothing is on enforce list that isn't supported */
8070 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8071 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8072 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8073 ret = -EINVAL;
8074 goto out;
8075 }
8076 }
8077
8078 /*
8079 * Minimal mode - state operations are allowed to use machine
8080 * credential. Note this already happens by default, so the
8081 * client doesn't have to do anything more than the negotiation.
8082 *
8083 * NOTE: we don't care if EXCHANGE_ID is in the list -
8084 * we're already using the machine cred for exchange_id
8085 * and will never use a different cred.
8086 */
8087 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8088 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8089 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8090 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8091 dfprintk(MOUNT, "sp4_mach_cred:\n");
8092 dfprintk(MOUNT, " minimal mode enabled\n");
8093 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8094 } else {
8095 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8096 ret = -EINVAL;
8097 goto out;
8098 }
8099
8100 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8101 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8102 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8103 test_bit(OP_LOCKU, sp->allow.u.longs)) {
8104 dfprintk(MOUNT, " cleanup mode enabled\n");
8105 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8106 }
8107
8108 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8109 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
8110 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8111 }
8112
8113 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8114 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8115 dfprintk(MOUNT, " secinfo mode enabled\n");
8116 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8117 }
8118
8119 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8120 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8121 dfprintk(MOUNT, " stateid mode enabled\n");
8122 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8123 }
8124
8125 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8126 dfprintk(MOUNT, " write mode enabled\n");
8127 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8128 }
8129
8130 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8131 dfprintk(MOUNT, " commit mode enabled\n");
8132 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8133 }
8134 }
8135 out:
8136 clp->cl_sp4_flags = flags;
8137 return ret;
8138 }
8139
8140 struct nfs41_exchange_id_data {
8141 struct nfs41_exchange_id_res res;
8142 struct nfs41_exchange_id_args args;
8143 };
8144
8145 static void nfs4_exchange_id_release(void *data)
8146 {
8147 struct nfs41_exchange_id_data *cdata =
8148 (struct nfs41_exchange_id_data *)data;
8149
8150 nfs_put_client(cdata->args.client);
8151 kfree(cdata->res.impl_id);
8152 kfree(cdata->res.server_scope);
8153 kfree(cdata->res.server_owner);
8154 kfree(cdata);
8155 }
8156
8157 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8158 .rpc_release = nfs4_exchange_id_release,
8159 };
8160
8161 /*
8162 * _nfs4_proc_exchange_id()
8163 *
8164 * Wrapper for EXCHANGE_ID operation.
8165 */
8166 static struct rpc_task *
8167 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8168 u32 sp4_how, struct rpc_xprt *xprt)
8169 {
8170 struct rpc_message msg = {
8171 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8172 .rpc_cred = cred,
8173 };
8174 struct rpc_task_setup task_setup_data = {
8175 .rpc_client = clp->cl_rpcclient,
8176 .callback_ops = &nfs4_exchange_id_call_ops,
8177 .rpc_message = &msg,
8178 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8179 };
8180 struct nfs41_exchange_id_data *calldata;
8181 int status;
8182
8183 if (!refcount_inc_not_zero(&clp->cl_count))
8184 return ERR_PTR(-EIO);
8185
8186 status = -ENOMEM;
8187 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8188 if (!calldata)
8189 goto out;
8190
8191 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8192
8193 status = nfs4_init_uniform_client_string(clp);
8194 if (status)
8195 goto out_calldata;
8196
8197 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8198 GFP_NOFS);
8199 status = -ENOMEM;
8200 if (unlikely(calldata->res.server_owner == NULL))
8201 goto out_calldata;
8202
8203 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8204 GFP_NOFS);
8205 if (unlikely(calldata->res.server_scope == NULL))
8206 goto out_server_owner;
8207
8208 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8209 if (unlikely(calldata->res.impl_id == NULL))
8210 goto out_server_scope;
8211
8212 switch (sp4_how) {
8213 case SP4_NONE:
8214 calldata->args.state_protect.how = SP4_NONE;
8215 break;
8216
8217 case SP4_MACH_CRED:
8218 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8219 break;
8220
8221 default:
8222 /* unsupported! */
8223 WARN_ON_ONCE(1);
8224 status = -EINVAL;
8225 goto out_impl_id;
8226 }
8227 if (xprt) {
8228 task_setup_data.rpc_xprt = xprt;
8229 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8230 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8231 sizeof(calldata->args.verifier.data));
8232 }
8233 calldata->args.client = clp;
8234 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8235 EXCHGID4_FLAG_BIND_PRINC_STATEID;
8236 #ifdef CONFIG_NFS_V4_1_MIGRATION
8237 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8238 #endif
8239 msg.rpc_argp = &calldata->args;
8240 msg.rpc_resp = &calldata->res;
8241 task_setup_data.callback_data = calldata;
8242
8243 return rpc_run_task(&task_setup_data);
8244
8245 out_impl_id:
8246 kfree(calldata->res.impl_id);
8247 out_server_scope:
8248 kfree(calldata->res.server_scope);
8249 out_server_owner:
8250 kfree(calldata->res.server_owner);
8251 out_calldata:
8252 kfree(calldata);
8253 out:
8254 nfs_put_client(clp);
8255 return ERR_PTR(status);
8256 }
8257
8258 /*
8259 * _nfs4_proc_exchange_id()
8260 *
8261 * Wrapper for EXCHANGE_ID operation.
8262 */
8263 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8264 u32 sp4_how)
8265 {
8266 struct rpc_task *task;
8267 struct nfs41_exchange_id_args *argp;
8268 struct nfs41_exchange_id_res *resp;
8269 unsigned long now = jiffies;
8270 int status;
8271
8272 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8273 if (IS_ERR(task))
8274 return PTR_ERR(task);
8275
8276 argp = task->tk_msg.rpc_argp;
8277 resp = task->tk_msg.rpc_resp;
8278 status = task->tk_status;
8279 if (status != 0)
8280 goto out;
8281
8282 status = nfs4_check_cl_exchange_flags(resp->flags);
8283 if (status != 0)
8284 goto out;
8285
8286 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8287 if (status != 0)
8288 goto out;
8289
8290 do_renew_lease(clp, now);
8291
8292 clp->cl_clientid = resp->clientid;
8293 clp->cl_exchange_flags = resp->flags;
8294 clp->cl_seqid = resp->seqid;
8295 /* Client ID is not confirmed */
8296 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8297 clear_bit(NFS4_SESSION_ESTABLISHED,
8298 &clp->cl_session->session_state);
8299
8300 if (clp->cl_serverscope != NULL &&
8301 !nfs41_same_server_scope(clp->cl_serverscope,
8302 resp->server_scope)) {
8303 dprintk("%s: server_scope mismatch detected\n",
8304 __func__);
8305 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8306 }
8307
8308 swap(clp->cl_serverowner, resp->server_owner);
8309 swap(clp->cl_serverscope, resp->server_scope);
8310 swap(clp->cl_implid, resp->impl_id);
8311
8312 /* Save the EXCHANGE_ID verifier session trunk tests */
8313 memcpy(clp->cl_confirm.data, argp->verifier.data,
8314 sizeof(clp->cl_confirm.data));
8315 out:
8316 trace_nfs4_exchange_id(clp, status);
8317 rpc_put_task(task);
8318 return status;
8319 }
8320
8321 /*
8322 * nfs4_proc_exchange_id()
8323 *
8324 * Returns zero, a negative errno, or a negative NFS4ERR status code.
8325 *
8326 * Since the clientid has expired, all compounds using sessions
8327 * associated with the stale clientid will be returning
8328 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8329 * be in some phase of session reset.
8330 *
8331 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8332 */
8333 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8334 {
8335 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8336 int status;
8337
8338 /* try SP4_MACH_CRED if krb5i/p */
8339 if (authflavor == RPC_AUTH_GSS_KRB5I ||
8340 authflavor == RPC_AUTH_GSS_KRB5P) {
8341 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8342 if (!status)
8343 return 0;
8344 }
8345
8346 /* try SP4_NONE */
8347 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8348 }
8349
8350 /**
8351 * nfs4_test_session_trunk
8352 *
8353 * This is an add_xprt_test() test function called from
8354 * rpc_clnt_setup_test_and_add_xprt.
8355 *
8356 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8357 * and is dereferrenced in nfs4_exchange_id_release
8358 *
8359 * Upon success, add the new transport to the rpc_clnt
8360 *
8361 * @clnt: struct rpc_clnt to get new transport
8362 * @xprt: the rpc_xprt to test
8363 * @data: call data for _nfs4_proc_exchange_id.
8364 */
8365 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8366 void *data)
8367 {
8368 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8369 struct rpc_task *task;
8370 int status;
8371
8372 u32 sp4_how;
8373
8374 dprintk("--> %s try %s\n", __func__,
8375 xprt->address_strings[RPC_DISPLAY_ADDR]);
8376
8377 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8378
8379 /* Test connection for session trunking. Async exchange_id call */
8380 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8381 if (IS_ERR(task))
8382 return;
8383
8384 status = task->tk_status;
8385 if (status == 0)
8386 status = nfs4_detect_session_trunking(adata->clp,
8387 task->tk_msg.rpc_resp, xprt);
8388
8389 if (status == 0)
8390 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8391
8392 rpc_put_task(task);
8393 }
8394 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8395
8396 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8397 const struct cred *cred)
8398 {
8399 struct rpc_message msg = {
8400 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8401 .rpc_argp = clp,
8402 .rpc_cred = cred,
8403 };
8404 int status;
8405
8406 status = rpc_call_sync(clp->cl_rpcclient, &msg,
8407 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8408 trace_nfs4_destroy_clientid(clp, status);
8409 if (status)
8410 dprintk("NFS: Got error %d from the server %s on "
8411 "DESTROY_CLIENTID.", status, clp->cl_hostname);
8412 return status;
8413 }
8414
8415 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8416 const struct cred *cred)
8417 {
8418 unsigned int loop;
8419 int ret;
8420
8421 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8422 ret = _nfs4_proc_destroy_clientid(clp, cred);
8423 switch (ret) {
8424 case -NFS4ERR_DELAY:
8425 case -NFS4ERR_CLIENTID_BUSY:
8426 ssleep(1);
8427 break;
8428 default:
8429 return ret;
8430 }
8431 }
8432 return 0;
8433 }
8434
8435 int nfs4_destroy_clientid(struct nfs_client *clp)
8436 {
8437 const struct cred *cred;
8438 int ret = 0;
8439
8440 if (clp->cl_mvops->minor_version < 1)
8441 goto out;
8442 if (clp->cl_exchange_flags == 0)
8443 goto out;
8444 if (clp->cl_preserve_clid)
8445 goto out;
8446 cred = nfs4_get_clid_cred(clp);
8447 ret = nfs4_proc_destroy_clientid(clp, cred);
8448 put_cred(cred);
8449 switch (ret) {
8450 case 0:
8451 case -NFS4ERR_STALE_CLIENTID:
8452 clp->cl_exchange_flags = 0;
8453 }
8454 out:
8455 return ret;
8456 }
8457
8458 #endif /* CONFIG_NFS_V4_1 */
8459
8460 struct nfs4_get_lease_time_data {
8461 struct nfs4_get_lease_time_args *args;
8462 struct nfs4_get_lease_time_res *res;
8463 struct nfs_client *clp;
8464 };
8465
8466 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
8467 void *calldata)
8468 {
8469 struct nfs4_get_lease_time_data *data =
8470 (struct nfs4_get_lease_time_data *)calldata;
8471
8472 dprintk("--> %s\n", __func__);
8473 /* just setup sequence, do not trigger session recovery
8474 since we're invoked within one */
8475 nfs4_setup_sequence(data->clp,
8476 &data->args->la_seq_args,
8477 &data->res->lr_seq_res,
8478 task);
8479 dprintk("<-- %s\n", __func__);
8480 }
8481
8482 /*
8483 * Called from nfs4_state_manager thread for session setup, so don't recover
8484 * from sequence operation or clientid errors.
8485 */
8486 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
8487 {
8488 struct nfs4_get_lease_time_data *data =
8489 (struct nfs4_get_lease_time_data *)calldata;
8490
8491 dprintk("--> %s\n", __func__);
8492 if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
8493 return;
8494 switch (task->tk_status) {
8495 case -NFS4ERR_DELAY:
8496 case -NFS4ERR_GRACE:
8497 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
8498 rpc_delay(task, NFS4_POLL_RETRY_MIN);
8499 task->tk_status = 0;
8500 /* fall through */
8501 case -NFS4ERR_RETRY_UNCACHED_REP:
8502 rpc_restart_call_prepare(task);
8503 return;
8504 }
8505 dprintk("<-- %s\n", __func__);
8506 }
8507
8508 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
8509 .rpc_call_prepare = nfs4_get_lease_time_prepare,
8510 .rpc_call_done = nfs4_get_lease_time_done,
8511 };
8512
8513 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
8514 {
8515 struct nfs4_get_lease_time_args args;
8516 struct nfs4_get_lease_time_res res = {
8517 .lr_fsinfo = fsinfo,
8518 };
8519 struct nfs4_get_lease_time_data data = {
8520 .args = &args,
8521 .res = &res,
8522 .clp = clp,
8523 };
8524 struct rpc_message msg = {
8525 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
8526 .rpc_argp = &args,
8527 .rpc_resp = &res,
8528 };
8529 struct rpc_task_setup task_setup = {
8530 .rpc_client = clp->cl_rpcclient,
8531 .rpc_message = &msg,
8532 .callback_ops = &nfs4_get_lease_time_ops,
8533 .callback_data = &data,
8534 .flags = RPC_TASK_TIMEOUT,
8535 };
8536
8537 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
8538 return nfs4_call_sync_custom(&task_setup);
8539 }
8540
8541 #ifdef CONFIG_NFS_V4_1
8542
8543 /*
8544 * Initialize the values to be used by the client in CREATE_SESSION
8545 * If nfs4_init_session set the fore channel request and response sizes,
8546 * use them.
8547 *
8548 * Set the back channel max_resp_sz_cached to zero to force the client to
8549 * always set csa_cachethis to FALSE because the current implementation
8550 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
8551 */
8552 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
8553 struct rpc_clnt *clnt)
8554 {
8555 unsigned int max_rqst_sz, max_resp_sz;
8556 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
8557 unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
8558
8559 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
8560 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
8561
8562 /* Fore channel attributes */
8563 args->fc_attrs.max_rqst_sz = max_rqst_sz;
8564 args->fc_attrs.max_resp_sz = max_resp_sz;
8565 args->fc_attrs.max_ops = NFS4_MAX_OPS;
8566 args->fc_attrs.max_reqs = max_session_slots;
8567
8568 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
8569 "max_ops=%u max_reqs=%u\n",
8570 __func__,
8571 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
8572 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
8573
8574 /* Back channel attributes */
8575 args->bc_attrs.max_rqst_sz = max_bc_payload;
8576 args->bc_attrs.max_resp_sz = max_bc_payload;
8577 args->bc_attrs.max_resp_sz_cached = 0;
8578 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
8579 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
8580 if (args->bc_attrs.max_reqs > max_bc_slots)
8581 args->bc_attrs.max_reqs = max_bc_slots;
8582
8583 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
8584 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
8585 __func__,
8586 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
8587 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
8588 args->bc_attrs.max_reqs);
8589 }
8590
8591 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
8592 struct nfs41_create_session_res *res)
8593 {
8594 struct nfs4_channel_attrs *sent = &args->fc_attrs;
8595 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
8596
8597 if (rcvd->max_resp_sz > sent->max_resp_sz)
8598 return -EINVAL;
8599 /*
8600 * Our requested max_ops is the minimum we need; we're not
8601 * prepared to break up compounds into smaller pieces than that.
8602 * So, no point even trying to continue if the server won't
8603 * cooperate:
8604 */
8605 if (rcvd->max_ops < sent->max_ops)
8606 return -EINVAL;
8607 if (rcvd->max_reqs == 0)
8608 return -EINVAL;
8609 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
8610 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
8611 return 0;
8612 }
8613
8614 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
8615 struct nfs41_create_session_res *res)
8616 {
8617 struct nfs4_channel_attrs *sent = &args->bc_attrs;
8618 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
8619
8620 if (!(res->flags & SESSION4_BACK_CHAN))
8621 goto out;
8622 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
8623 return -EINVAL;
8624 if (rcvd->max_resp_sz < sent->max_resp_sz)
8625 return -EINVAL;
8626 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
8627 return -EINVAL;
8628 if (rcvd->max_ops > sent->max_ops)
8629 return -EINVAL;
8630 if (rcvd->max_reqs > sent->max_reqs)
8631 return -EINVAL;
8632 out:
8633 return 0;
8634 }
8635
8636 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8637 struct nfs41_create_session_res *res)
8638 {
8639 int ret;
8640
8641 ret = nfs4_verify_fore_channel_attrs(args, res);
8642 if (ret)
8643 return ret;
8644 return nfs4_verify_back_channel_attrs(args, res);
8645 }
8646
8647 static void nfs4_update_session(struct nfs4_session *session,
8648 struct nfs41_create_session_res *res)
8649 {
8650 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8651 /* Mark client id and session as being confirmed */
8652 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8653 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8654 session->flags = res->flags;
8655 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8656 if (res->flags & SESSION4_BACK_CHAN)
8657 memcpy(&session->bc_attrs, &res->bc_attrs,
8658 sizeof(session->bc_attrs));
8659 }
8660
8661 static int _nfs4_proc_create_session(struct nfs_client *clp,
8662 const struct cred *cred)
8663 {
8664 struct nfs4_session *session = clp->cl_session;
8665 struct nfs41_create_session_args args = {
8666 .client = clp,
8667 .clientid = clp->cl_clientid,
8668 .seqid = clp->cl_seqid,
8669 .cb_program = NFS4_CALLBACK,
8670 };
8671 struct nfs41_create_session_res res;
8672
8673 struct rpc_message msg = {
8674 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8675 .rpc_argp = &args,
8676 .rpc_resp = &res,
8677 .rpc_cred = cred,
8678 };
8679 int status;
8680
8681 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8682 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8683
8684 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8685 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8686 trace_nfs4_create_session(clp, status);
8687
8688 switch (status) {
8689 case -NFS4ERR_STALE_CLIENTID:
8690 case -NFS4ERR_DELAY:
8691 case -ETIMEDOUT:
8692 case -EACCES:
8693 case -EAGAIN:
8694 goto out;
8695 }
8696
8697 clp->cl_seqid++;
8698 if (!status) {
8699 /* Verify the session's negotiated channel_attrs values */
8700 status = nfs4_verify_channel_attrs(&args, &res);
8701 /* Increment the clientid slot sequence id */
8702 if (status)
8703 goto out;
8704 nfs4_update_session(session, &res);
8705 }
8706 out:
8707 return status;
8708 }
8709
8710 /*
8711 * Issues a CREATE_SESSION operation to the server.
8712 * It is the responsibility of the caller to verify the session is
8713 * expired before calling this routine.
8714 */
8715 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
8716 {
8717 int status;
8718 unsigned *ptr;
8719 struct nfs4_session *session = clp->cl_session;
8720
8721 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
8722
8723 status = _nfs4_proc_create_session(clp, cred);
8724 if (status)
8725 goto out;
8726
8727 /* Init or reset the session slot tables */
8728 status = nfs4_setup_session_slot_tables(session);
8729 dprintk("slot table setup returned %d\n", status);
8730 if (status)
8731 goto out;
8732
8733 ptr = (unsigned *)&session->sess_id.data[0];
8734 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
8735 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
8736 out:
8737 dprintk("<-- %s\n", __func__);
8738 return status;
8739 }
8740
8741 /*
8742 * Issue the over-the-wire RPC DESTROY_SESSION.
8743 * The caller must serialize access to this routine.
8744 */
8745 int nfs4_proc_destroy_session(struct nfs4_session *session,
8746 const struct cred *cred)
8747 {
8748 struct rpc_message msg = {
8749 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
8750 .rpc_argp = session,
8751 .rpc_cred = cred,
8752 };
8753 int status = 0;
8754
8755 dprintk("--> nfs4_proc_destroy_session\n");
8756
8757 /* session is still being setup */
8758 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
8759 return 0;
8760
8761 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8762 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8763 trace_nfs4_destroy_session(session->clp, status);
8764
8765 if (status)
8766 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
8767 "Session has been destroyed regardless...\n", status);
8768
8769 dprintk("<-- nfs4_proc_destroy_session\n");
8770 return status;
8771 }
8772
8773 /*
8774 * Renew the cl_session lease.
8775 */
8776 struct nfs4_sequence_data {
8777 struct nfs_client *clp;
8778 struct nfs4_sequence_args args;
8779 struct nfs4_sequence_res res;
8780 };
8781
8782 static void nfs41_sequence_release(void *data)
8783 {
8784 struct nfs4_sequence_data *calldata = data;
8785 struct nfs_client *clp = calldata->clp;
8786
8787 if (refcount_read(&clp->cl_count) > 1)
8788 nfs4_schedule_state_renewal(clp);
8789 nfs_put_client(clp);
8790 kfree(calldata);
8791 }
8792
8793 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8794 {
8795 switch(task->tk_status) {
8796 case -NFS4ERR_DELAY:
8797 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8798 return -EAGAIN;
8799 default:
8800 nfs4_schedule_lease_recovery(clp);
8801 }
8802 return 0;
8803 }
8804
8805 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
8806 {
8807 struct nfs4_sequence_data *calldata = data;
8808 struct nfs_client *clp = calldata->clp;
8809
8810 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
8811 return;
8812
8813 trace_nfs4_sequence(clp, task->tk_status);
8814 if (task->tk_status < 0) {
8815 dprintk("%s ERROR %d\n", __func__, task->tk_status);
8816 if (refcount_read(&clp->cl_count) == 1)
8817 goto out;
8818
8819 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
8820 rpc_restart_call_prepare(task);
8821 return;
8822 }
8823 }
8824 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
8825 out:
8826 dprintk("<-- %s\n", __func__);
8827 }
8828
8829 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
8830 {
8831 struct nfs4_sequence_data *calldata = data;
8832 struct nfs_client *clp = calldata->clp;
8833 struct nfs4_sequence_args *args;
8834 struct nfs4_sequence_res *res;
8835
8836 args = task->tk_msg.rpc_argp;
8837 res = task->tk_msg.rpc_resp;
8838
8839 nfs4_setup_sequence(clp, args, res, task);
8840 }
8841
8842 static const struct rpc_call_ops nfs41_sequence_ops = {
8843 .rpc_call_done = nfs41_sequence_call_done,
8844 .rpc_call_prepare = nfs41_sequence_prepare,
8845 .rpc_release = nfs41_sequence_release,
8846 };
8847
8848 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
8849 const struct cred *cred,
8850 struct nfs4_slot *slot,
8851 bool is_privileged)
8852 {
8853 struct nfs4_sequence_data *calldata;
8854 struct rpc_message msg = {
8855 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
8856 .rpc_cred = cred,
8857 };
8858 struct rpc_task_setup task_setup_data = {
8859 .rpc_client = clp->cl_rpcclient,
8860 .rpc_message = &msg,
8861 .callback_ops = &nfs41_sequence_ops,
8862 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
8863 };
8864 struct rpc_task *ret;
8865
8866 ret = ERR_PTR(-EIO);
8867 if (!refcount_inc_not_zero(&clp->cl_count))
8868 goto out_err;
8869
8870 ret = ERR_PTR(-ENOMEM);
8871 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8872 if (calldata == NULL)
8873 goto out_put_clp;
8874 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
8875 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
8876 msg.rpc_argp = &calldata->args;
8877 msg.rpc_resp = &calldata->res;
8878 calldata->clp = clp;
8879 task_setup_data.callback_data = calldata;
8880
8881 ret = rpc_run_task(&task_setup_data);
8882 if (IS_ERR(ret))
8883 goto out_err;
8884 return ret;
8885 out_put_clp:
8886 nfs_put_client(clp);
8887 out_err:
8888 nfs41_release_slot(slot);
8889 return ret;
8890 }
8891
8892 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
8893 {
8894 struct rpc_task *task;
8895 int ret = 0;
8896
8897 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
8898 return -EAGAIN;
8899 task = _nfs41_proc_sequence(clp, cred, NULL, false);
8900 if (IS_ERR(task))
8901 ret = PTR_ERR(task);
8902 else
8903 rpc_put_task_async(task);
8904 dprintk("<-- %s status=%d\n", __func__, ret);
8905 return ret;
8906 }
8907
8908 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
8909 {
8910 struct rpc_task *task;
8911 int ret;
8912
8913 task = _nfs41_proc_sequence(clp, cred, NULL, true);
8914 if (IS_ERR(task)) {
8915 ret = PTR_ERR(task);
8916 goto out;
8917 }
8918 ret = rpc_wait_for_completion_task(task);
8919 if (!ret)
8920 ret = task->tk_status;
8921 rpc_put_task(task);
8922 out:
8923 dprintk("<-- %s status=%d\n", __func__, ret);
8924 return ret;
8925 }
8926
8927 struct nfs4_reclaim_complete_data {
8928 struct nfs_client *clp;
8929 struct nfs41_reclaim_complete_args arg;
8930 struct nfs41_reclaim_complete_res res;
8931 };
8932
8933 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
8934 {
8935 struct nfs4_reclaim_complete_data *calldata = data;
8936
8937 nfs4_setup_sequence(calldata->clp,
8938 &calldata->arg.seq_args,
8939 &calldata->res.seq_res,
8940 task);
8941 }
8942
8943 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8944 {
8945 switch(task->tk_status) {
8946 case 0:
8947 wake_up_all(&clp->cl_lock_waitq);
8948 /* Fallthrough */
8949 case -NFS4ERR_COMPLETE_ALREADY:
8950 case -NFS4ERR_WRONG_CRED: /* What to do here? */
8951 break;
8952 case -NFS4ERR_DELAY:
8953 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8954 /* fall through */
8955 case -NFS4ERR_RETRY_UNCACHED_REP:
8956 return -EAGAIN;
8957 case -NFS4ERR_BADSESSION:
8958 case -NFS4ERR_DEADSESSION:
8959 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
8960 break;
8961 default:
8962 nfs4_schedule_lease_recovery(clp);
8963 }
8964 return 0;
8965 }
8966
8967 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
8968 {
8969 struct nfs4_reclaim_complete_data *calldata = data;
8970 struct nfs_client *clp = calldata->clp;
8971 struct nfs4_sequence_res *res = &calldata->res.seq_res;
8972
8973 dprintk("--> %s\n", __func__);
8974 if (!nfs41_sequence_done(task, res))
8975 return;
8976
8977 trace_nfs4_reclaim_complete(clp, task->tk_status);
8978 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
8979 rpc_restart_call_prepare(task);
8980 return;
8981 }
8982 dprintk("<-- %s\n", __func__);
8983 }
8984
8985 static void nfs4_free_reclaim_complete_data(void *data)
8986 {
8987 struct nfs4_reclaim_complete_data *calldata = data;
8988
8989 kfree(calldata);
8990 }
8991
8992 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
8993 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
8994 .rpc_call_done = nfs4_reclaim_complete_done,
8995 .rpc_release = nfs4_free_reclaim_complete_data,
8996 };
8997
8998 /*
8999 * Issue a global reclaim complete.
9000 */
9001 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9002 const struct cred *cred)
9003 {
9004 struct nfs4_reclaim_complete_data *calldata;
9005 struct rpc_message msg = {
9006 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9007 .rpc_cred = cred,
9008 };
9009 struct rpc_task_setup task_setup_data = {
9010 .rpc_client = clp->cl_rpcclient,
9011 .rpc_message = &msg,
9012 .callback_ops = &nfs4_reclaim_complete_call_ops,
9013 .flags = RPC_TASK_NO_ROUND_ROBIN,
9014 };
9015 int status = -ENOMEM;
9016
9017 dprintk("--> %s\n", __func__);
9018 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9019 if (calldata == NULL)
9020 goto out;
9021 calldata->clp = clp;
9022 calldata->arg.one_fs = 0;
9023
9024 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9025 msg.rpc_argp = &calldata->arg;
9026 msg.rpc_resp = &calldata->res;
9027 task_setup_data.callback_data = calldata;
9028 status = nfs4_call_sync_custom(&task_setup_data);
9029 out:
9030 dprintk("<-- %s status=%d\n", __func__, status);
9031 return status;
9032 }
9033
9034 static void
9035 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9036 {
9037 struct nfs4_layoutget *lgp = calldata;
9038 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9039
9040 dprintk("--> %s\n", __func__);
9041 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9042 &lgp->res.seq_res, task);
9043 dprintk("<-- %s\n", __func__);
9044 }
9045
9046 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9047 {
9048 struct nfs4_layoutget *lgp = calldata;
9049
9050 dprintk("--> %s\n", __func__);
9051 nfs41_sequence_process(task, &lgp->res.seq_res);
9052 dprintk("<-- %s\n", __func__);
9053 }
9054
9055 static int
9056 nfs4_layoutget_handle_exception(struct rpc_task *task,
9057 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9058 {
9059 struct inode *inode = lgp->args.inode;
9060 struct nfs_server *server = NFS_SERVER(inode);
9061 struct pnfs_layout_hdr *lo;
9062 int nfs4err = task->tk_status;
9063 int err, status = 0;
9064 LIST_HEAD(head);
9065
9066 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9067
9068 nfs4_sequence_free_slot(&lgp->res.seq_res);
9069
9070 switch (nfs4err) {
9071 case 0:
9072 goto out;
9073
9074 /*
9075 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9076 * on the file. set tk_status to -ENODATA to tell upper layer to
9077 * retry go inband.
9078 */
9079 case -NFS4ERR_LAYOUTUNAVAILABLE:
9080 status = -ENODATA;
9081 goto out;
9082 /*
9083 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9084 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9085 */
9086 case -NFS4ERR_BADLAYOUT:
9087 status = -EOVERFLOW;
9088 goto out;
9089 /*
9090 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9091 * (or clients) writing to the same RAID stripe except when
9092 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9093 *
9094 * Treat it like we would RECALLCONFLICT -- we retry for a little
9095 * while, and then eventually give up.
9096 */
9097 case -NFS4ERR_LAYOUTTRYLATER:
9098 if (lgp->args.minlength == 0) {
9099 status = -EOVERFLOW;
9100 goto out;
9101 }
9102 status = -EBUSY;
9103 break;
9104 case -NFS4ERR_RECALLCONFLICT:
9105 status = -ERECALLCONFLICT;
9106 break;
9107 case -NFS4ERR_DELEG_REVOKED:
9108 case -NFS4ERR_ADMIN_REVOKED:
9109 case -NFS4ERR_EXPIRED:
9110 case -NFS4ERR_BAD_STATEID:
9111 exception->timeout = 0;
9112 spin_lock(&inode->i_lock);
9113 lo = NFS_I(inode)->layout;
9114 /* If the open stateid was bad, then recover it. */
9115 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9116 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9117 spin_unlock(&inode->i_lock);
9118 exception->state = lgp->args.ctx->state;
9119 exception->stateid = &lgp->args.stateid;
9120 break;
9121 }
9122
9123 /*
9124 * Mark the bad layout state as invalid, then retry
9125 */
9126 pnfs_mark_layout_stateid_invalid(lo, &head);
9127 spin_unlock(&inode->i_lock);
9128 nfs_commit_inode(inode, 0);
9129 pnfs_free_lseg_list(&head);
9130 status = -EAGAIN;
9131 goto out;
9132 }
9133
9134 err = nfs4_handle_exception(server, nfs4err, exception);
9135 if (!status) {
9136 if (exception->retry)
9137 status = -EAGAIN;
9138 else
9139 status = err;
9140 }
9141 out:
9142 dprintk("<-- %s\n", __func__);
9143 return status;
9144 }
9145
9146 size_t max_response_pages(struct nfs_server *server)
9147 {
9148 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9149 return nfs_page_array_len(0, max_resp_sz);
9150 }
9151
9152 static void nfs4_layoutget_release(void *calldata)
9153 {
9154 struct nfs4_layoutget *lgp = calldata;
9155
9156 dprintk("--> %s\n", __func__);
9157 nfs4_sequence_free_slot(&lgp->res.seq_res);
9158 pnfs_layoutget_free(lgp);
9159 dprintk("<-- %s\n", __func__);
9160 }
9161
9162 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9163 .rpc_call_prepare = nfs4_layoutget_prepare,
9164 .rpc_call_done = nfs4_layoutget_done,
9165 .rpc_release = nfs4_layoutget_release,
9166 };
9167
9168 struct pnfs_layout_segment *
9169 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9170 {
9171 struct inode *inode = lgp->args.inode;
9172 struct nfs_server *server = NFS_SERVER(inode);
9173 struct rpc_task *task;
9174 struct rpc_message msg = {
9175 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9176 .rpc_argp = &lgp->args,
9177 .rpc_resp = &lgp->res,
9178 .rpc_cred = lgp->cred,
9179 };
9180 struct rpc_task_setup task_setup_data = {
9181 .rpc_client = server->client,
9182 .rpc_message = &msg,
9183 .callback_ops = &nfs4_layoutget_call_ops,
9184 .callback_data = lgp,
9185 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
9186 };
9187 struct pnfs_layout_segment *lseg = NULL;
9188 struct nfs4_exception exception = {
9189 .inode = inode,
9190 .timeout = *timeout,
9191 };
9192 int status = 0;
9193
9194 dprintk("--> %s\n", __func__);
9195
9196 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
9197 pnfs_get_layout_hdr(NFS_I(inode)->layout);
9198
9199 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9200
9201 task = rpc_run_task(&task_setup_data);
9202
9203 status = rpc_wait_for_completion_task(task);
9204 if (status != 0)
9205 goto out;
9206
9207 if (task->tk_status < 0) {
9208 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9209 *timeout = exception.timeout;
9210 } else if (lgp->res.layoutp->len == 0) {
9211 status = -EAGAIN;
9212 *timeout = nfs4_update_delay(&exception.timeout);
9213 } else
9214 lseg = pnfs_layout_process(lgp);
9215 out:
9216 trace_nfs4_layoutget(lgp->args.ctx,
9217 &lgp->args.range,
9218 &lgp->res.range,
9219 &lgp->res.stateid,
9220 status);
9221
9222 rpc_put_task(task);
9223 dprintk("<-- %s status=%d\n", __func__, status);
9224 if (status)
9225 return ERR_PTR(status);
9226 return lseg;
9227 }
9228
9229 static void
9230 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9231 {
9232 struct nfs4_layoutreturn *lrp = calldata;
9233
9234 dprintk("--> %s\n", __func__);
9235 nfs4_setup_sequence(lrp->clp,
9236 &lrp->args.seq_args,
9237 &lrp->res.seq_res,
9238 task);
9239 if (!pnfs_layout_is_valid(lrp->args.layout))
9240 rpc_exit(task, 0);
9241 }
9242
9243 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9244 {
9245 struct nfs4_layoutreturn *lrp = calldata;
9246 struct nfs_server *server;
9247
9248 dprintk("--> %s\n", __func__);
9249
9250 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9251 return;
9252
9253 /*
9254 * Was there an RPC level error? Assume the call succeeded,
9255 * and that we need to release the layout
9256 */
9257 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9258 lrp->res.lrs_present = 0;
9259 return;
9260 }
9261
9262 server = NFS_SERVER(lrp->args.inode);
9263 switch (task->tk_status) {
9264 case -NFS4ERR_OLD_STATEID:
9265 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9266 &lrp->args.range,
9267 lrp->args.inode))
9268 goto out_restart;
9269 /* Fallthrough */
9270 default:
9271 task->tk_status = 0;
9272 /* Fallthrough */
9273 case 0:
9274 break;
9275 case -NFS4ERR_DELAY:
9276 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9277 break;
9278 goto out_restart;
9279 }
9280 dprintk("<-- %s\n", __func__);
9281 return;
9282 out_restart:
9283 task->tk_status = 0;
9284 nfs4_sequence_free_slot(&lrp->res.seq_res);
9285 rpc_restart_call_prepare(task);
9286 }
9287
9288 static void nfs4_layoutreturn_release(void *calldata)
9289 {
9290 struct nfs4_layoutreturn *lrp = calldata;
9291 struct pnfs_layout_hdr *lo = lrp->args.layout;
9292
9293 dprintk("--> %s\n", __func__);
9294 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9295 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9296 nfs4_sequence_free_slot(&lrp->res.seq_res);
9297 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9298 lrp->ld_private.ops->free(&lrp->ld_private);
9299 pnfs_put_layout_hdr(lrp->args.layout);
9300 nfs_iput_and_deactive(lrp->inode);
9301 put_cred(lrp->cred);
9302 kfree(calldata);
9303 dprintk("<-- %s\n", __func__);
9304 }
9305
9306 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9307 .rpc_call_prepare = nfs4_layoutreturn_prepare,
9308 .rpc_call_done = nfs4_layoutreturn_done,
9309 .rpc_release = nfs4_layoutreturn_release,
9310 };
9311
9312 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9313 {
9314 struct rpc_task *task;
9315 struct rpc_message msg = {
9316 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9317 .rpc_argp = &lrp->args,
9318 .rpc_resp = &lrp->res,
9319 .rpc_cred = lrp->cred,
9320 };
9321 struct rpc_task_setup task_setup_data = {
9322 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9323 .rpc_message = &msg,
9324 .callback_ops = &nfs4_layoutreturn_call_ops,
9325 .callback_data = lrp,
9326 };
9327 int status = 0;
9328
9329 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9330 NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9331 &task_setup_data.rpc_client, &msg);
9332
9333 dprintk("--> %s\n", __func__);
9334 if (!sync) {
9335 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9336 if (!lrp->inode) {
9337 nfs4_layoutreturn_release(lrp);
9338 return -EAGAIN;
9339 }
9340 task_setup_data.flags |= RPC_TASK_ASYNC;
9341 }
9342 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
9343 task = rpc_run_task(&task_setup_data);
9344 if (IS_ERR(task))
9345 return PTR_ERR(task);
9346 if (sync)
9347 status = task->tk_status;
9348 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9349 dprintk("<-- %s status=%d\n", __func__, status);
9350 rpc_put_task(task);
9351 return status;
9352 }
9353
9354 static int
9355 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9356 struct pnfs_device *pdev,
9357 const struct cred *cred)
9358 {
9359 struct nfs4_getdeviceinfo_args args = {
9360 .pdev = pdev,
9361 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9362 NOTIFY_DEVICEID4_DELETE,
9363 };
9364 struct nfs4_getdeviceinfo_res res = {
9365 .pdev = pdev,
9366 };
9367 struct rpc_message msg = {
9368 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9369 .rpc_argp = &args,
9370 .rpc_resp = &res,
9371 .rpc_cred = cred,
9372 };
9373 int status;
9374
9375 dprintk("--> %s\n", __func__);
9376 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9377 if (res.notification & ~args.notify_types)
9378 dprintk("%s: unsupported notification\n", __func__);
9379 if (res.notification != args.notify_types)
9380 pdev->nocache = 1;
9381
9382 dprintk("<-- %s status=%d\n", __func__, status);
9383
9384 return status;
9385 }
9386
9387 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9388 struct pnfs_device *pdev,
9389 const struct cred *cred)
9390 {
9391 struct nfs4_exception exception = { };
9392 int err;
9393
9394 do {
9395 err = nfs4_handle_exception(server,
9396 _nfs4_proc_getdeviceinfo(server, pdev, cred),
9397 &exception);
9398 } while (exception.retry);
9399 return err;
9400 }
9401 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9402
9403 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9404 {
9405 struct nfs4_layoutcommit_data *data = calldata;
9406 struct nfs_server *server = NFS_SERVER(data->args.inode);
9407
9408 nfs4_setup_sequence(server->nfs_client,
9409 &data->args.seq_args,
9410 &data->res.seq_res,
9411 task);
9412 }
9413
9414 static void
9415 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9416 {
9417 struct nfs4_layoutcommit_data *data = calldata;
9418 struct nfs_server *server = NFS_SERVER(data->args.inode);
9419
9420 if (!nfs41_sequence_done(task, &data->res.seq_res))
9421 return;
9422
9423 switch (task->tk_status) { /* Just ignore these failures */
9424 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9425 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
9426 case -NFS4ERR_BADLAYOUT: /* no layout */
9427 case -NFS4ERR_GRACE: /* loca_recalim always false */
9428 task->tk_status = 0;
9429 case 0:
9430 break;
9431 default:
9432 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9433 rpc_restart_call_prepare(task);
9434 return;
9435 }
9436 }
9437 }
9438
9439 static void nfs4_layoutcommit_release(void *calldata)
9440 {
9441 struct nfs4_layoutcommit_data *data = calldata;
9442
9443 pnfs_cleanup_layoutcommit(data);
9444 nfs_post_op_update_inode_force_wcc(data->args.inode,
9445 data->res.fattr);
9446 put_cred(data->cred);
9447 nfs_iput_and_deactive(data->inode);
9448 kfree(data);
9449 }
9450
9451 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9452 .rpc_call_prepare = nfs4_layoutcommit_prepare,
9453 .rpc_call_done = nfs4_layoutcommit_done,
9454 .rpc_release = nfs4_layoutcommit_release,
9455 };
9456
9457 int
9458 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9459 {
9460 struct rpc_message msg = {
9461 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9462 .rpc_argp = &data->args,
9463 .rpc_resp = &data->res,
9464 .rpc_cred = data->cred,
9465 };
9466 struct rpc_task_setup task_setup_data = {
9467 .task = &data->task,
9468 .rpc_client = NFS_CLIENT(data->args.inode),
9469 .rpc_message = &msg,
9470 .callback_ops = &nfs4_layoutcommit_ops,
9471 .callback_data = data,
9472 };
9473 struct rpc_task *task;
9474 int status = 0;
9475
9476 dprintk("NFS: initiating layoutcommit call. sync %d "
9477 "lbw: %llu inode %lu\n", sync,
9478 data->args.lastbytewritten,
9479 data->args.inode->i_ino);
9480
9481 if (!sync) {
9482 data->inode = nfs_igrab_and_active(data->args.inode);
9483 if (data->inode == NULL) {
9484 nfs4_layoutcommit_release(data);
9485 return -EAGAIN;
9486 }
9487 task_setup_data.flags = RPC_TASK_ASYNC;
9488 }
9489 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
9490 task = rpc_run_task(&task_setup_data);
9491 if (IS_ERR(task))
9492 return PTR_ERR(task);
9493 if (sync)
9494 status = task->tk_status;
9495 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
9496 dprintk("%s: status %d\n", __func__, status);
9497 rpc_put_task(task);
9498 return status;
9499 }
9500
9501 /*
9502 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
9503 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
9504 */
9505 static int
9506 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9507 struct nfs_fsinfo *info,
9508 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
9509 {
9510 struct nfs41_secinfo_no_name_args args = {
9511 .style = SECINFO_STYLE_CURRENT_FH,
9512 };
9513 struct nfs4_secinfo_res res = {
9514 .flavors = flavors,
9515 };
9516 struct rpc_message msg = {
9517 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
9518 .rpc_argp = &args,
9519 .rpc_resp = &res,
9520 };
9521 struct rpc_clnt *clnt = server->client;
9522 struct nfs4_call_sync_data data = {
9523 .seq_server = server,
9524 .seq_args = &args.seq_args,
9525 .seq_res = &res.seq_res,
9526 };
9527 struct rpc_task_setup task_setup = {
9528 .rpc_client = server->client,
9529 .rpc_message = &msg,
9530 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
9531 .callback_data = &data,
9532 .flags = RPC_TASK_NO_ROUND_ROBIN,
9533 };
9534 const struct cred *cred = NULL;
9535 int status;
9536
9537 if (use_integrity) {
9538 clnt = server->nfs_client->cl_rpcclient;
9539 task_setup.rpc_client = clnt;
9540
9541 cred = nfs4_get_clid_cred(server->nfs_client);
9542 msg.rpc_cred = cred;
9543 }
9544
9545 dprintk("--> %s\n", __func__);
9546 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
9547 status = nfs4_call_sync_custom(&task_setup);
9548 dprintk("<-- %s status=%d\n", __func__, status);
9549
9550 put_cred(cred);
9551
9552 return status;
9553 }
9554
9555 static int
9556 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9557 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
9558 {
9559 struct nfs4_exception exception = {
9560 .interruptible = true,
9561 };
9562 int err;
9563 do {
9564 /* first try using integrity protection */
9565 err = -NFS4ERR_WRONGSEC;
9566
9567 /* try to use integrity protection with machine cred */
9568 if (_nfs4_is_integrity_protected(server->nfs_client))
9569 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9570 flavors, true);
9571
9572 /*
9573 * if unable to use integrity protection, or SECINFO with
9574 * integrity protection returns NFS4ERR_WRONGSEC (which is
9575 * disallowed by spec, but exists in deployed servers) use
9576 * the current filesystem's rpc_client and the user cred.
9577 */
9578 if (err == -NFS4ERR_WRONGSEC)
9579 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9580 flavors, false);
9581
9582 switch (err) {
9583 case 0:
9584 case -NFS4ERR_WRONGSEC:
9585 case -ENOTSUPP:
9586 goto out;
9587 default:
9588 err = nfs4_handle_exception(server, err, &exception);
9589 }
9590 } while (exception.retry);
9591 out:
9592 return err;
9593 }
9594
9595 static int
9596 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
9597 struct nfs_fsinfo *info)
9598 {
9599 int err;
9600 struct page *page;
9601 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9602 struct nfs4_secinfo_flavors *flavors;
9603 struct nfs4_secinfo4 *secinfo;
9604 int i;
9605
9606 page = alloc_page(GFP_KERNEL);
9607 if (!page) {
9608 err = -ENOMEM;
9609 goto out;
9610 }
9611
9612 flavors = page_address(page);
9613 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
9614
9615 /*
9616 * Fall back on "guess and check" method if
9617 * the server doesn't support SECINFO_NO_NAME
9618 */
9619 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
9620 err = nfs4_find_root_sec(server, fhandle, info);
9621 goto out_freepage;
9622 }
9623 if (err)
9624 goto out_freepage;
9625
9626 for (i = 0; i < flavors->num_flavors; i++) {
9627 secinfo = &flavors->flavors[i];
9628
9629 switch (secinfo->flavor) {
9630 case RPC_AUTH_NULL:
9631 case RPC_AUTH_UNIX:
9632 case RPC_AUTH_GSS:
9633 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9634 &secinfo->flavor_info);
9635 break;
9636 default:
9637 flavor = RPC_AUTH_MAXFLAVOR;
9638 break;
9639 }
9640
9641 if (!nfs_auth_info_match(&server->auth_info, flavor))
9642 flavor = RPC_AUTH_MAXFLAVOR;
9643
9644 if (flavor != RPC_AUTH_MAXFLAVOR) {
9645 err = nfs4_lookup_root_sec(server, fhandle,
9646 info, flavor);
9647 if (!err)
9648 break;
9649 }
9650 }
9651
9652 if (flavor == RPC_AUTH_MAXFLAVOR)
9653 err = -EPERM;
9654
9655 out_freepage:
9656 put_page(page);
9657 if (err == -EACCES)
9658 return -EPERM;
9659 out:
9660 return err;
9661 }
9662
9663 static int _nfs41_test_stateid(struct nfs_server *server,
9664 nfs4_stateid *stateid,
9665 const struct cred *cred)
9666 {
9667 int status;
9668 struct nfs41_test_stateid_args args = {
9669 .stateid = stateid,
9670 };
9671 struct nfs41_test_stateid_res res;
9672 struct rpc_message msg = {
9673 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9674 .rpc_argp = &args,
9675 .rpc_resp = &res,
9676 .rpc_cred = cred,
9677 };
9678 struct rpc_clnt *rpc_client = server->client;
9679
9680 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9681 &rpc_client, &msg);
9682
9683 dprintk("NFS call test_stateid %p\n", stateid);
9684 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
9685 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9686 &args.seq_args, &res.seq_res);
9687 if (status != NFS_OK) {
9688 dprintk("NFS reply test_stateid: failed, %d\n", status);
9689 return status;
9690 }
9691 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
9692 return -res.status;
9693 }
9694
9695 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
9696 int err, struct nfs4_exception *exception)
9697 {
9698 exception->retry = 0;
9699 switch(err) {
9700 case -NFS4ERR_DELAY:
9701 case -NFS4ERR_RETRY_UNCACHED_REP:
9702 nfs4_handle_exception(server, err, exception);
9703 break;
9704 case -NFS4ERR_BADSESSION:
9705 case -NFS4ERR_BADSLOT:
9706 case -NFS4ERR_BAD_HIGH_SLOT:
9707 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9708 case -NFS4ERR_DEADSESSION:
9709 nfs4_do_handle_exception(server, err, exception);
9710 }
9711 }
9712
9713 /**
9714 * nfs41_test_stateid - perform a TEST_STATEID operation
9715 *
9716 * @server: server / transport on which to perform the operation
9717 * @stateid: state ID to test
9718 * @cred: credential
9719 *
9720 * Returns NFS_OK if the server recognizes that "stateid" is valid.
9721 * Otherwise a negative NFS4ERR value is returned if the operation
9722 * failed or the state ID is not currently valid.
9723 */
9724 static int nfs41_test_stateid(struct nfs_server *server,
9725 nfs4_stateid *stateid,
9726 const struct cred *cred)
9727 {
9728 struct nfs4_exception exception = {
9729 .interruptible = true,
9730 };
9731 int err;
9732 do {
9733 err = _nfs41_test_stateid(server, stateid, cred);
9734 nfs4_handle_delay_or_session_error(server, err, &exception);
9735 } while (exception.retry);
9736 return err;
9737 }
9738
9739 struct nfs_free_stateid_data {
9740 struct nfs_server *server;
9741 struct nfs41_free_stateid_args args;
9742 struct nfs41_free_stateid_res res;
9743 };
9744
9745 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
9746 {
9747 struct nfs_free_stateid_data *data = calldata;
9748 nfs4_setup_sequence(data->server->nfs_client,
9749 &data->args.seq_args,
9750 &data->res.seq_res,
9751 task);
9752 }
9753
9754 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
9755 {
9756 struct nfs_free_stateid_data *data = calldata;
9757
9758 nfs41_sequence_done(task, &data->res.seq_res);
9759
9760 switch (task->tk_status) {
9761 case -NFS4ERR_DELAY:
9762 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
9763 rpc_restart_call_prepare(task);
9764 }
9765 }
9766
9767 static void nfs41_free_stateid_release(void *calldata)
9768 {
9769 kfree(calldata);
9770 }
9771
9772 static const struct rpc_call_ops nfs41_free_stateid_ops = {
9773 .rpc_call_prepare = nfs41_free_stateid_prepare,
9774 .rpc_call_done = nfs41_free_stateid_done,
9775 .rpc_release = nfs41_free_stateid_release,
9776 };
9777
9778 /**
9779 * nfs41_free_stateid - perform a FREE_STATEID operation
9780 *
9781 * @server: server / transport on which to perform the operation
9782 * @stateid: state ID to release
9783 * @cred: credential
9784 * @privileged: set to true if this call needs to be privileged
9785 *
9786 * Note: this function is always asynchronous.
9787 */
9788 static int nfs41_free_stateid(struct nfs_server *server,
9789 const nfs4_stateid *stateid,
9790 const struct cred *cred,
9791 bool privileged)
9792 {
9793 struct rpc_message msg = {
9794 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
9795 .rpc_cred = cred,
9796 };
9797 struct rpc_task_setup task_setup = {
9798 .rpc_client = server->client,
9799 .rpc_message = &msg,
9800 .callback_ops = &nfs41_free_stateid_ops,
9801 .flags = RPC_TASK_ASYNC,
9802 };
9803 struct nfs_free_stateid_data *data;
9804 struct rpc_task *task;
9805
9806 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9807 &task_setup.rpc_client, &msg);
9808
9809 dprintk("NFS call free_stateid %p\n", stateid);
9810 data = kmalloc(sizeof(*data), GFP_NOFS);
9811 if (!data)
9812 return -ENOMEM;
9813 data->server = server;
9814 nfs4_stateid_copy(&data->args.stateid, stateid);
9815
9816 task_setup.callback_data = data;
9817
9818 msg.rpc_argp = &data->args;
9819 msg.rpc_resp = &data->res;
9820 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
9821 task = rpc_run_task(&task_setup);
9822 if (IS_ERR(task))
9823 return PTR_ERR(task);
9824 rpc_put_task(task);
9825 return 0;
9826 }
9827
9828 static void
9829 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
9830 {
9831 const struct cred *cred = lsp->ls_state->owner->so_cred;
9832
9833 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
9834 nfs4_free_lock_state(server, lsp);
9835 }
9836
9837 static bool nfs41_match_stateid(const nfs4_stateid *s1,
9838 const nfs4_stateid *s2)
9839 {
9840 if (s1->type != s2->type)
9841 return false;
9842
9843 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
9844 return false;
9845
9846 if (s1->seqid == s2->seqid)
9847 return true;
9848
9849 return s1->seqid == 0 || s2->seqid == 0;
9850 }
9851
9852 #endif /* CONFIG_NFS_V4_1 */
9853
9854 static bool nfs4_match_stateid(const nfs4_stateid *s1,
9855 const nfs4_stateid *s2)
9856 {
9857 return nfs4_stateid_match(s1, s2);
9858 }
9859
9860
9861 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
9862 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9863 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9864 .recover_open = nfs4_open_reclaim,
9865 .recover_lock = nfs4_lock_reclaim,
9866 .establish_clid = nfs4_init_clientid,
9867 .detect_trunking = nfs40_discover_server_trunking,
9868 };
9869
9870 #if defined(CONFIG_NFS_V4_1)
9871 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
9872 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9873 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9874 .recover_open = nfs4_open_reclaim,
9875 .recover_lock = nfs4_lock_reclaim,
9876 .establish_clid = nfs41_init_clientid,
9877 .reclaim_complete = nfs41_proc_reclaim_complete,
9878 .detect_trunking = nfs41_discover_server_trunking,
9879 };
9880 #endif /* CONFIG_NFS_V4_1 */
9881
9882 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
9883 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9884 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9885 .recover_open = nfs40_open_expired,
9886 .recover_lock = nfs4_lock_expired,
9887 .establish_clid = nfs4_init_clientid,
9888 };
9889
9890 #if defined(CONFIG_NFS_V4_1)
9891 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
9892 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9893 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9894 .recover_open = nfs41_open_expired,
9895 .recover_lock = nfs41_lock_expired,
9896 .establish_clid = nfs41_init_clientid,
9897 };
9898 #endif /* CONFIG_NFS_V4_1 */
9899
9900 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
9901 .sched_state_renewal = nfs4_proc_async_renew,
9902 .get_state_renewal_cred = nfs4_get_renew_cred,
9903 .renew_lease = nfs4_proc_renew,
9904 };
9905
9906 #if defined(CONFIG_NFS_V4_1)
9907 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
9908 .sched_state_renewal = nfs41_proc_async_sequence,
9909 .get_state_renewal_cred = nfs4_get_machine_cred,
9910 .renew_lease = nfs4_proc_sequence,
9911 };
9912 #endif
9913
9914 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
9915 .get_locations = _nfs40_proc_get_locations,
9916 .fsid_present = _nfs40_proc_fsid_present,
9917 };
9918
9919 #if defined(CONFIG_NFS_V4_1)
9920 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
9921 .get_locations = _nfs41_proc_get_locations,
9922 .fsid_present = _nfs41_proc_fsid_present,
9923 };
9924 #endif /* CONFIG_NFS_V4_1 */
9925
9926 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
9927 .minor_version = 0,
9928 .init_caps = NFS_CAP_READDIRPLUS
9929 | NFS_CAP_ATOMIC_OPEN
9930 | NFS_CAP_POSIX_LOCK,
9931 .init_client = nfs40_init_client,
9932 .shutdown_client = nfs40_shutdown_client,
9933 .match_stateid = nfs4_match_stateid,
9934 .find_root_sec = nfs4_find_root_sec,
9935 .free_lock_state = nfs4_release_lockowner,
9936 .test_and_free_expired = nfs40_test_and_free_expired_stateid,
9937 .alloc_seqid = nfs_alloc_seqid,
9938 .call_sync_ops = &nfs40_call_sync_ops,
9939 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
9940 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
9941 .state_renewal_ops = &nfs40_state_renewal_ops,
9942 .mig_recovery_ops = &nfs40_mig_recovery_ops,
9943 };
9944
9945 #if defined(CONFIG_NFS_V4_1)
9946 static struct nfs_seqid *
9947 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
9948 {
9949 return NULL;
9950 }
9951
9952 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
9953 .minor_version = 1,
9954 .init_caps = NFS_CAP_READDIRPLUS
9955 | NFS_CAP_ATOMIC_OPEN
9956 | NFS_CAP_POSIX_LOCK
9957 | NFS_CAP_STATEID_NFSV41
9958 | NFS_CAP_ATOMIC_OPEN_V1
9959 | NFS_CAP_LGOPEN,
9960 .init_client = nfs41_init_client,
9961 .shutdown_client = nfs41_shutdown_client,
9962 .match_stateid = nfs41_match_stateid,
9963 .find_root_sec = nfs41_find_root_sec,
9964 .free_lock_state = nfs41_free_lock_state,
9965 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9966 .alloc_seqid = nfs_alloc_no_seqid,
9967 .session_trunk = nfs4_test_session_trunk,
9968 .call_sync_ops = &nfs41_call_sync_ops,
9969 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9970 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9971 .state_renewal_ops = &nfs41_state_renewal_ops,
9972 .mig_recovery_ops = &nfs41_mig_recovery_ops,
9973 };
9974 #endif
9975
9976 #if defined(CONFIG_NFS_V4_2)
9977 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
9978 .minor_version = 2,
9979 .init_caps = NFS_CAP_READDIRPLUS
9980 | NFS_CAP_ATOMIC_OPEN
9981 | NFS_CAP_POSIX_LOCK
9982 | NFS_CAP_STATEID_NFSV41
9983 | NFS_CAP_ATOMIC_OPEN_V1
9984 | NFS_CAP_LGOPEN
9985 | NFS_CAP_ALLOCATE
9986 | NFS_CAP_COPY
9987 | NFS_CAP_OFFLOAD_CANCEL
9988 | NFS_CAP_COPY_NOTIFY
9989 | NFS_CAP_DEALLOCATE
9990 | NFS_CAP_SEEK
9991 | NFS_CAP_LAYOUTSTATS
9992 | NFS_CAP_CLONE
9993 | NFS_CAP_LAYOUTERROR,
9994 .init_client = nfs41_init_client,
9995 .shutdown_client = nfs41_shutdown_client,
9996 .match_stateid = nfs41_match_stateid,
9997 .find_root_sec = nfs41_find_root_sec,
9998 .free_lock_state = nfs41_free_lock_state,
9999 .call_sync_ops = &nfs41_call_sync_ops,
10000 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10001 .alloc_seqid = nfs_alloc_no_seqid,
10002 .session_trunk = nfs4_test_session_trunk,
10003 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10004 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10005 .state_renewal_ops = &nfs41_state_renewal_ops,
10006 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10007 };
10008 #endif
10009
10010 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10011 [0] = &nfs_v4_0_minor_ops,
10012 #if defined(CONFIG_NFS_V4_1)
10013 [1] = &nfs_v4_1_minor_ops,
10014 #endif
10015 #if defined(CONFIG_NFS_V4_2)
10016 [2] = &nfs_v4_2_minor_ops,
10017 #endif
10018 };
10019
10020 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10021 {
10022 ssize_t error, error2;
10023
10024 error = generic_listxattr(dentry, list, size);
10025 if (error < 0)
10026 return error;
10027 if (list) {
10028 list += error;
10029 size -= error;
10030 }
10031
10032 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10033 if (error2 < 0)
10034 return error2;
10035 return error + error2;
10036 }
10037
10038 static const struct inode_operations nfs4_dir_inode_operations = {
10039 .create = nfs_create,
10040 .lookup = nfs_lookup,
10041 .atomic_open = nfs_atomic_open,
10042 .link = nfs_link,
10043 .unlink = nfs_unlink,
10044 .symlink = nfs_symlink,
10045 .mkdir = nfs_mkdir,
10046 .rmdir = nfs_rmdir,
10047 .mknod = nfs_mknod,
10048 .rename = nfs_rename,
10049 .permission = nfs_permission,
10050 .getattr = nfs_getattr,
10051 .setattr = nfs_setattr,
10052 .listxattr = nfs4_listxattr,
10053 };
10054
10055 static const struct inode_operations nfs4_file_inode_operations = {
10056 .permission = nfs_permission,
10057 .getattr = nfs_getattr,
10058 .setattr = nfs_setattr,
10059 .listxattr = nfs4_listxattr,
10060 };
10061
10062 const struct nfs_rpc_ops nfs_v4_clientops = {
10063 .version = 4, /* protocol version */
10064 .dentry_ops = &nfs4_dentry_operations,
10065 .dir_inode_ops = &nfs4_dir_inode_operations,
10066 .file_inode_ops = &nfs4_file_inode_operations,
10067 .file_ops = &nfs4_file_operations,
10068 .getroot = nfs4_proc_get_root,
10069 .submount = nfs4_submount,
10070 .try_get_tree = nfs4_try_get_tree,
10071 .getattr = nfs4_proc_getattr,
10072 .setattr = nfs4_proc_setattr,
10073 .lookup = nfs4_proc_lookup,
10074 .lookupp = nfs4_proc_lookupp,
10075 .access = nfs4_proc_access,
10076 .readlink = nfs4_proc_readlink,
10077 .create = nfs4_proc_create,
10078 .remove = nfs4_proc_remove,
10079 .unlink_setup = nfs4_proc_unlink_setup,
10080 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10081 .unlink_done = nfs4_proc_unlink_done,
10082 .rename_setup = nfs4_proc_rename_setup,
10083 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10084 .rename_done = nfs4_proc_rename_done,
10085 .link = nfs4_proc_link,
10086 .symlink = nfs4_proc_symlink,
10087 .mkdir = nfs4_proc_mkdir,
10088 .rmdir = nfs4_proc_rmdir,
10089 .readdir = nfs4_proc_readdir,
10090 .mknod = nfs4_proc_mknod,
10091 .statfs = nfs4_proc_statfs,
10092 .fsinfo = nfs4_proc_fsinfo,
10093 .pathconf = nfs4_proc_pathconf,
10094 .set_capabilities = nfs4_server_capabilities,
10095 .decode_dirent = nfs4_decode_dirent,
10096 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10097 .read_setup = nfs4_proc_read_setup,
10098 .read_done = nfs4_read_done,
10099 .write_setup = nfs4_proc_write_setup,
10100 .write_done = nfs4_write_done,
10101 .commit_setup = nfs4_proc_commit_setup,
10102 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10103 .commit_done = nfs4_commit_done,
10104 .lock = nfs4_proc_lock,
10105 .clear_acl_cache = nfs4_zap_acl_attr,
10106 .close_context = nfs4_close_context,
10107 .open_context = nfs4_atomic_open,
10108 .have_delegation = nfs4_have_delegation,
10109 .alloc_client = nfs4_alloc_client,
10110 .init_client = nfs4_init_client,
10111 .free_client = nfs4_free_client,
10112 .create_server = nfs4_create_server,
10113 .clone_server = nfs_clone_server,
10114 };
10115
10116 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10117 .name = XATTR_NAME_NFSV4_ACL,
10118 .list = nfs4_xattr_list_nfs4_acl,
10119 .get = nfs4_xattr_get_nfs4_acl,
10120 .set = nfs4_xattr_set_nfs4_acl,
10121 };
10122
10123 const struct xattr_handler *nfs4_xattr_handlers[] = {
10124 &nfs4_xattr_nfs4_acl_handler,
10125 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10126 &nfs4_xattr_nfs4_label_handler,
10127 #endif
10128 NULL
10129 };
10130
10131 /*
10132 * Local variables:
10133 * c-basic-offset: 8
10134 * End:
10135 */
Linux with added FPC-III support