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