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locking/refcounts: Include fewer headers in <linux/refcount.h>
[linux/fpc-iii.git] / fs / nfs / nfs4proc.c
blobed45090e4df6471902f5968b908429fe28976280
1 /*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #include <linux/mm.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/ratelimit.h>
43 #include <linux/printk.h>
44 #include <linux/slab.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfs.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/nfs_page.h>
50 #include <linux/nfs_mount.h>
51 #include <linux/namei.h>
52 #include <linux/mount.h>
53 #include <linux/module.h>
54 #include <linux/xattr.h>
55 #include <linux/utsname.h>
56 #include <linux/freezer.h>
57 #include <linux/iversion.h>
58
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "nfs4idmap.h"
67 #include "nfs4session.h"
68 #include "fscache.h"
69
70 #include "nfs4trace.h"
71
72 #define NFSDBG_FACILITY NFSDBG_PROC
73
74 #define NFS4_BITMASK_SZ 3
75
76 #define NFS4_POLL_RETRY_MIN (HZ/10)
77 #define NFS4_POLL_RETRY_MAX (15*HZ)
78
79 /* file attributes which can be mapped to nfs attributes */
80 #define NFS4_VALID_ATTRS (ATTR_MODE \
81 | ATTR_UID \
82 | ATTR_GID \
83 | ATTR_SIZE \
84 | ATTR_ATIME \
85 | ATTR_MTIME \
86 | ATTR_CTIME \
87 | ATTR_ATIME_SET \
88 | ATTR_MTIME_SET)
89
90 struct nfs4_opendata;
91 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
92 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
93 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
94 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label, struct inode *inode);
95 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
96 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
97 struct nfs_fattr *fattr, struct iattr *sattr,
98 struct nfs_open_context *ctx, struct nfs4_label *ilabel,
99 struct nfs4_label *olabel);
100 #ifdef CONFIG_NFS_V4_1
101 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
102 struct rpc_cred *cred,
103 struct nfs4_slot *slot,
104 bool is_privileged);
105 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
106 struct rpc_cred *);
107 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
108 struct rpc_cred *, bool);
109 #endif
110
111 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
112 static inline struct nfs4_label *
113 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
114 struct iattr *sattr, struct nfs4_label *label)
115 {
116 int err;
117
118 if (label == NULL)
119 return NULL;
120
121 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
122 return NULL;
123
124 err = security_dentry_init_security(dentry, sattr->ia_mode,
125 &dentry->d_name, (void **)&label->label, &label->len);
126 if (err == 0)
127 return label;
128
129 return NULL;
130 }
131 static inline void
132 nfs4_label_release_security(struct nfs4_label *label)
133 {
134 if (label)
135 security_release_secctx(label->label, label->len);
136 }
137 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
138 {
139 if (label)
140 return server->attr_bitmask;
141
142 return server->attr_bitmask_nl;
143 }
144 #else
145 static inline struct nfs4_label *
146 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
147 struct iattr *sattr, struct nfs4_label *l)
148 { return NULL; }
149 static inline void
150 nfs4_label_release_security(struct nfs4_label *label)
151 { return; }
152 static inline u32 *
153 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
154 { return server->attr_bitmask; }
155 #endif
156
157 /* Prevent leaks of NFSv4 errors into userland */
158 static int nfs4_map_errors(int err)
159 {
160 if (err >= -1000)
161 return err;
162 switch (err) {
163 case -NFS4ERR_RESOURCE:
164 case -NFS4ERR_LAYOUTTRYLATER:
165 case -NFS4ERR_RECALLCONFLICT:
166 return -EREMOTEIO;
167 case -NFS4ERR_WRONGSEC:
168 case -NFS4ERR_WRONG_CRED:
169 return -EPERM;
170 case -NFS4ERR_BADOWNER:
171 case -NFS4ERR_BADNAME:
172 return -EINVAL;
173 case -NFS4ERR_SHARE_DENIED:
174 return -EACCES;
175 case -NFS4ERR_MINOR_VERS_MISMATCH:
176 return -EPROTONOSUPPORT;
177 case -NFS4ERR_FILE_OPEN:
178 return -EBUSY;
179 default:
180 dprintk("%s could not handle NFSv4 error %d\n",
181 __func__, -err);
182 break;
183 }
184 return -EIO;
185 }
186
187 /*
188 * This is our standard bitmap for GETATTR requests.
189 */
190 const u32 nfs4_fattr_bitmap[3] = {
191 FATTR4_WORD0_TYPE
192 | FATTR4_WORD0_CHANGE
193 | FATTR4_WORD0_SIZE
194 | FATTR4_WORD0_FSID
195 | FATTR4_WORD0_FILEID,
196 FATTR4_WORD1_MODE
197 | FATTR4_WORD1_NUMLINKS
198 | FATTR4_WORD1_OWNER
199 | FATTR4_WORD1_OWNER_GROUP
200 | FATTR4_WORD1_RAWDEV
201 | FATTR4_WORD1_SPACE_USED
202 | FATTR4_WORD1_TIME_ACCESS
203 | FATTR4_WORD1_TIME_METADATA
204 | FATTR4_WORD1_TIME_MODIFY
205 | FATTR4_WORD1_MOUNTED_ON_FILEID,
206 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
207 FATTR4_WORD2_SECURITY_LABEL
208 #endif
209 };
210
211 static const u32 nfs4_pnfs_open_bitmap[3] = {
212 FATTR4_WORD0_TYPE
213 | FATTR4_WORD0_CHANGE
214 | FATTR4_WORD0_SIZE
215 | FATTR4_WORD0_FSID
216 | FATTR4_WORD0_FILEID,
217 FATTR4_WORD1_MODE
218 | FATTR4_WORD1_NUMLINKS
219 | FATTR4_WORD1_OWNER
220 | FATTR4_WORD1_OWNER_GROUP
221 | FATTR4_WORD1_RAWDEV
222 | FATTR4_WORD1_SPACE_USED
223 | FATTR4_WORD1_TIME_ACCESS
224 | FATTR4_WORD1_TIME_METADATA
225 | FATTR4_WORD1_TIME_MODIFY,
226 FATTR4_WORD2_MDSTHRESHOLD
227 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
228 | FATTR4_WORD2_SECURITY_LABEL
229 #endif
230 };
231
232 static const u32 nfs4_open_noattr_bitmap[3] = {
233 FATTR4_WORD0_TYPE
234 | FATTR4_WORD0_FILEID,
235 };
236
237 const u32 nfs4_statfs_bitmap[3] = {
238 FATTR4_WORD0_FILES_AVAIL
239 | FATTR4_WORD0_FILES_FREE
240 | FATTR4_WORD0_FILES_TOTAL,
241 FATTR4_WORD1_SPACE_AVAIL
242 | FATTR4_WORD1_SPACE_FREE
243 | FATTR4_WORD1_SPACE_TOTAL
244 };
245
246 const u32 nfs4_pathconf_bitmap[3] = {
247 FATTR4_WORD0_MAXLINK
248 | FATTR4_WORD0_MAXNAME,
249 0
250 };
251
252 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
253 | FATTR4_WORD0_MAXREAD
254 | FATTR4_WORD0_MAXWRITE
255 | FATTR4_WORD0_LEASE_TIME,
256 FATTR4_WORD1_TIME_DELTA
257 | FATTR4_WORD1_FS_LAYOUT_TYPES,
258 FATTR4_WORD2_LAYOUT_BLKSIZE
259 | FATTR4_WORD2_CLONE_BLKSIZE
260 };
261
262 const u32 nfs4_fs_locations_bitmap[3] = {
263 FATTR4_WORD0_CHANGE
264 | FATTR4_WORD0_SIZE
265 | FATTR4_WORD0_FSID
266 | FATTR4_WORD0_FILEID
267 | FATTR4_WORD0_FS_LOCATIONS,
268 FATTR4_WORD1_OWNER
269 | FATTR4_WORD1_OWNER_GROUP
270 | FATTR4_WORD1_RAWDEV
271 | FATTR4_WORD1_SPACE_USED
272 | FATTR4_WORD1_TIME_ACCESS
273 | FATTR4_WORD1_TIME_METADATA
274 | FATTR4_WORD1_TIME_MODIFY
275 | FATTR4_WORD1_MOUNTED_ON_FILEID,
276 };
277
278 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
279 struct inode *inode)
280 {
281 unsigned long cache_validity;
282
283 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
284 if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
285 return;
286
287 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
288 if (!(cache_validity & NFS_INO_REVAL_FORCED))
289 cache_validity &= ~(NFS_INO_INVALID_CHANGE
290 | NFS_INO_INVALID_SIZE);
291
292 if (!(cache_validity & NFS_INO_INVALID_SIZE))
293 dst[0] &= ~FATTR4_WORD0_SIZE;
294
295 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
296 dst[0] &= ~FATTR4_WORD0_CHANGE;
297 }
298
299 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst,
300 const __u32 *src, struct inode *inode)
301 {
302 nfs4_bitmap_copy_adjust(dst, src, inode);
303 }
304
305 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
306 struct nfs4_readdir_arg *readdir)
307 {
308 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
309 __be32 *start, *p;
310
311 if (cookie > 2) {
312 readdir->cookie = cookie;
313 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
314 return;
315 }
316
317 readdir->cookie = 0;
318 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
319 if (cookie == 2)
320 return;
321
322 /*
323 * NFSv4 servers do not return entries for '.' and '..'
324 * Therefore, we fake these entries here. We let '.'
325 * have cookie 0 and '..' have cookie 1. Note that
326 * when talking to the server, we always send cookie 0
327 * instead of 1 or 2.
328 */
329 start = p = kmap_atomic(*readdir->pages);
330
331 if (cookie == 0) {
332 *p++ = xdr_one; /* next */
333 *p++ = xdr_zero; /* cookie, first word */
334 *p++ = xdr_one; /* cookie, second word */
335 *p++ = xdr_one; /* entry len */
336 memcpy(p, ".\0\0\0", 4); /* entry */
337 p++;
338 *p++ = xdr_one; /* bitmap length */
339 *p++ = htonl(attrs); /* bitmap */
340 *p++ = htonl(12); /* attribute buffer length */
341 *p++ = htonl(NF4DIR);
342 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
343 }
344
345 *p++ = xdr_one; /* next */
346 *p++ = xdr_zero; /* cookie, first word */
347 *p++ = xdr_two; /* cookie, second word */
348 *p++ = xdr_two; /* entry len */
349 memcpy(p, "..\0\0", 4); /* entry */
350 p++;
351 *p++ = xdr_one; /* bitmap length */
352 *p++ = htonl(attrs); /* bitmap */
353 *p++ = htonl(12); /* attribute buffer length */
354 *p++ = htonl(NF4DIR);
355 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
356
357 readdir->pgbase = (char *)p - (char *)start;
358 readdir->count -= readdir->pgbase;
359 kunmap_atomic(start);
360 }
361
362 static void nfs4_test_and_free_stateid(struct nfs_server *server,
363 nfs4_stateid *stateid,
364 struct rpc_cred *cred)
365 {
366 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
367
368 ops->test_and_free_expired(server, stateid, cred);
369 }
370
371 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
372 nfs4_stateid *stateid,
373 struct rpc_cred *cred)
374 {
375 stateid->type = NFS4_REVOKED_STATEID_TYPE;
376 nfs4_test_and_free_stateid(server, stateid, cred);
377 }
378
379 static void nfs4_free_revoked_stateid(struct nfs_server *server,
380 const nfs4_stateid *stateid,
381 struct rpc_cred *cred)
382 {
383 nfs4_stateid tmp;
384
385 nfs4_stateid_copy(&tmp, stateid);
386 __nfs4_free_revoked_stateid(server, &tmp, cred);
387 }
388
389 static long nfs4_update_delay(long *timeout)
390 {
391 long ret;
392 if (!timeout)
393 return NFS4_POLL_RETRY_MAX;
394 if (*timeout <= 0)
395 *timeout = NFS4_POLL_RETRY_MIN;
396 if (*timeout > NFS4_POLL_RETRY_MAX)
397 *timeout = NFS4_POLL_RETRY_MAX;
398 ret = *timeout;
399 *timeout <<= 1;
400 return ret;
401 }
402
403 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
404 {
405 int res = 0;
406
407 might_sleep();
408
409 freezable_schedule_timeout_killable_unsafe(
410 nfs4_update_delay(timeout));
411 if (fatal_signal_pending(current))
412 res = -ERESTARTSYS;
413 return res;
414 }
415
416 /* This is the error handling routine for processes that are allowed
417 * to sleep.
418 */
419 static int nfs4_do_handle_exception(struct nfs_server *server,
420 int errorcode, struct nfs4_exception *exception)
421 {
422 struct nfs_client *clp = server->nfs_client;
423 struct nfs4_state *state = exception->state;
424 const nfs4_stateid *stateid = exception->stateid;
425 struct inode *inode = exception->inode;
426 int ret = errorcode;
427
428 exception->delay = 0;
429 exception->recovering = 0;
430 exception->retry = 0;
431
432 if (stateid == NULL && state != NULL)
433 stateid = &state->stateid;
434
435 switch(errorcode) {
436 case 0:
437 return 0;
438 case -NFS4ERR_BADHANDLE:
439 case -ESTALE:
440 if (inode != NULL && S_ISREG(inode->i_mode))
441 pnfs_destroy_layout(NFS_I(inode));
442 break;
443 case -NFS4ERR_DELEG_REVOKED:
444 case -NFS4ERR_ADMIN_REVOKED:
445 case -NFS4ERR_EXPIRED:
446 case -NFS4ERR_BAD_STATEID:
447 if (inode != NULL && stateid != NULL) {
448 nfs_inode_find_state_and_recover(inode,
449 stateid);
450 goto wait_on_recovery;
451 }
452 case -NFS4ERR_OPENMODE:
453 if (inode) {
454 int err;
455
456 err = nfs_async_inode_return_delegation(inode,
457 stateid);
458 if (err == 0)
459 goto wait_on_recovery;
460 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
461 exception->retry = 1;
462 break;
463 }
464 }
465 if (state == NULL)
466 break;
467 ret = nfs4_schedule_stateid_recovery(server, state);
468 if (ret < 0)
469 break;
470 goto wait_on_recovery;
471 case -NFS4ERR_STALE_STATEID:
472 case -NFS4ERR_STALE_CLIENTID:
473 nfs4_schedule_lease_recovery(clp);
474 goto wait_on_recovery;
475 case -NFS4ERR_MOVED:
476 ret = nfs4_schedule_migration_recovery(server);
477 if (ret < 0)
478 break;
479 goto wait_on_recovery;
480 case -NFS4ERR_LEASE_MOVED:
481 nfs4_schedule_lease_moved_recovery(clp);
482 goto wait_on_recovery;
483 #if defined(CONFIG_NFS_V4_1)
484 case -NFS4ERR_BADSESSION:
485 case -NFS4ERR_BADSLOT:
486 case -NFS4ERR_BAD_HIGH_SLOT:
487 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
488 case -NFS4ERR_DEADSESSION:
489 case -NFS4ERR_SEQ_FALSE_RETRY:
490 case -NFS4ERR_SEQ_MISORDERED:
491 dprintk("%s ERROR: %d Reset session\n", __func__,
492 errorcode);
493 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
494 goto wait_on_recovery;
495 #endif /* defined(CONFIG_NFS_V4_1) */
496 case -NFS4ERR_FILE_OPEN:
497 if (exception->timeout > HZ) {
498 /* We have retried a decent amount, time to
499 * fail
500 */
501 ret = -EBUSY;
502 break;
503 }
504 case -NFS4ERR_DELAY:
505 nfs_inc_server_stats(server, NFSIOS_DELAY);
506 case -NFS4ERR_GRACE:
507 case -NFS4ERR_LAYOUTTRYLATER:
508 case -NFS4ERR_RECALLCONFLICT:
509 exception->delay = 1;
510 return 0;
511
512 case -NFS4ERR_RETRY_UNCACHED_REP:
513 case -NFS4ERR_OLD_STATEID:
514 exception->retry = 1;
515 break;
516 case -NFS4ERR_BADOWNER:
517 /* The following works around a Linux server bug! */
518 case -NFS4ERR_BADNAME:
519 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
520 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
521 exception->retry = 1;
522 printk(KERN_WARNING "NFS: v4 server %s "
523 "does not accept raw "
524 "uid/gids. "
525 "Reenabling the idmapper.\n",
526 server->nfs_client->cl_hostname);
527 }
528 }
529 /* We failed to handle the error */
530 return nfs4_map_errors(ret);
531 wait_on_recovery:
532 exception->recovering = 1;
533 return 0;
534 }
535
536 /* This is the error handling routine for processes that are allowed
537 * to sleep.
538 */
539 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
540 {
541 struct nfs_client *clp = server->nfs_client;
542 int ret;
543
544 ret = nfs4_do_handle_exception(server, errorcode, exception);
545 if (exception->delay) {
546 ret = nfs4_delay(server->client, &exception->timeout);
547 goto out_retry;
548 }
549 if (exception->recovering) {
550 ret = nfs4_wait_clnt_recover(clp);
551 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
552 return -EIO;
553 goto out_retry;
554 }
555 return ret;
556 out_retry:
557 if (ret == 0)
558 exception->retry = 1;
559 return ret;
560 }
561
562 static int
563 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
564 int errorcode, struct nfs4_exception *exception)
565 {
566 struct nfs_client *clp = server->nfs_client;
567 int ret;
568
569 ret = nfs4_do_handle_exception(server, errorcode, exception);
570 if (exception->delay) {
571 rpc_delay(task, nfs4_update_delay(&exception->timeout));
572 goto out_retry;
573 }
574 if (exception->recovering) {
575 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
576 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
577 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
578 goto out_retry;
579 }
580 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
581 ret = -EIO;
582 return ret;
583 out_retry:
584 if (ret == 0)
585 exception->retry = 1;
586 return ret;
587 }
588
589 static int
590 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
591 struct nfs4_state *state, long *timeout)
592 {
593 struct nfs4_exception exception = {
594 .state = state,
595 };
596
597 if (task->tk_status >= 0)
598 return 0;
599 if (timeout)
600 exception.timeout = *timeout;
601 task->tk_status = nfs4_async_handle_exception(task, server,
602 task->tk_status,
603 &exception);
604 if (exception.delay && timeout)
605 *timeout = exception.timeout;
606 if (exception.retry)
607 return -EAGAIN;
608 return 0;
609 }
610
611 /*
612 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
613 * or 'false' otherwise.
614 */
615 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
616 {
617 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
618 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
619 }
620
621 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
622 {
623 spin_lock(&clp->cl_lock);
624 if (time_before(clp->cl_last_renewal,timestamp))
625 clp->cl_last_renewal = timestamp;
626 spin_unlock(&clp->cl_lock);
627 }
628
629 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
630 {
631 struct nfs_client *clp = server->nfs_client;
632
633 if (!nfs4_has_session(clp))
634 do_renew_lease(clp, timestamp);
635 }
636
637 struct nfs4_call_sync_data {
638 const struct nfs_server *seq_server;
639 struct nfs4_sequence_args *seq_args;
640 struct nfs4_sequence_res *seq_res;
641 };
642
643 void nfs4_init_sequence(struct nfs4_sequence_args *args,
644 struct nfs4_sequence_res *res, int cache_reply,
645 int privileged)
646 {
647 args->sa_slot = NULL;
648 args->sa_cache_this = cache_reply;
649 args->sa_privileged = privileged;
650
651 res->sr_slot = NULL;
652 }
653
654 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
655 {
656 struct nfs4_slot *slot = res->sr_slot;
657 struct nfs4_slot_table *tbl;
658
659 tbl = slot->table;
660 spin_lock(&tbl->slot_tbl_lock);
661 if (!nfs41_wake_and_assign_slot(tbl, slot))
662 nfs4_free_slot(tbl, slot);
663 spin_unlock(&tbl->slot_tbl_lock);
664
665 res->sr_slot = NULL;
666 }
667
668 static int nfs40_sequence_done(struct rpc_task *task,
669 struct nfs4_sequence_res *res)
670 {
671 if (res->sr_slot != NULL)
672 nfs40_sequence_free_slot(res);
673 return 1;
674 }
675
676 #if defined(CONFIG_NFS_V4_1)
677
678 static void nfs41_release_slot(struct nfs4_slot *slot)
679 {
680 struct nfs4_session *session;
681 struct nfs4_slot_table *tbl;
682 bool send_new_highest_used_slotid = false;
683
684 if (!slot)
685 return;
686 tbl = slot->table;
687 session = tbl->session;
688
689 /* Bump the slot sequence number */
690 if (slot->seq_done)
691 slot->seq_nr++;
692 slot->seq_done = 0;
693
694 spin_lock(&tbl->slot_tbl_lock);
695 /* Be nice to the server: try to ensure that the last transmitted
696 * value for highest_user_slotid <= target_highest_slotid
697 */
698 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
699 send_new_highest_used_slotid = true;
700
701 if (nfs41_wake_and_assign_slot(tbl, slot)) {
702 send_new_highest_used_slotid = false;
703 goto out_unlock;
704 }
705 nfs4_free_slot(tbl, slot);
706
707 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
708 send_new_highest_used_slotid = false;
709 out_unlock:
710 spin_unlock(&tbl->slot_tbl_lock);
711 if (send_new_highest_used_slotid)
712 nfs41_notify_server(session->clp);
713 if (waitqueue_active(&tbl->slot_waitq))
714 wake_up_all(&tbl->slot_waitq);
715 }
716
717 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
718 {
719 nfs41_release_slot(res->sr_slot);
720 res->sr_slot = NULL;
721 }
722
723 static int nfs41_sequence_process(struct rpc_task *task,
724 struct nfs4_sequence_res *res)
725 {
726 struct nfs4_session *session;
727 struct nfs4_slot *slot = res->sr_slot;
728 struct nfs_client *clp;
729 bool interrupted = false;
730 int ret = 1;
731
732 if (slot == NULL)
733 goto out_noaction;
734 /* don't increment the sequence number if the task wasn't sent */
735 if (!RPC_WAS_SENT(task))
736 goto out;
737
738 session = slot->table->session;
739
740 if (slot->interrupted) {
741 if (res->sr_status != -NFS4ERR_DELAY)
742 slot->interrupted = 0;
743 interrupted = true;
744 }
745
746 trace_nfs4_sequence_done(session, res);
747 /* Check the SEQUENCE operation status */
748 switch (res->sr_status) {
749 case 0:
750 /* Update the slot's sequence and clientid lease timer */
751 slot->seq_done = 1;
752 clp = session->clp;
753 do_renew_lease(clp, res->sr_timestamp);
754 /* Check sequence flags */
755 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
756 !!slot->privileged);
757 nfs41_update_target_slotid(slot->table, slot, res);
758 break;
759 case 1:
760 /*
761 * sr_status remains 1 if an RPC level error occurred.
762 * The server may or may not have processed the sequence
763 * operation..
764 * Mark the slot as having hosted an interrupted RPC call.
765 */
766 slot->interrupted = 1;
767 goto out;
768 case -NFS4ERR_DELAY:
769 /* The server detected a resend of the RPC call and
770 * returned NFS4ERR_DELAY as per Section 2.10.6.2
771 * of RFC5661.
772 */
773 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
774 __func__,
775 slot->slot_nr,
776 slot->seq_nr);
777 goto out_retry;
778 case -NFS4ERR_RETRY_UNCACHED_REP:
779 case -NFS4ERR_SEQ_FALSE_RETRY:
780 /*
781 * The server thinks we tried to replay a request.
782 * Retry the call after bumping the sequence ID.
783 */
784 goto retry_new_seq;
785 case -NFS4ERR_BADSLOT:
786 /*
787 * The slot id we used was probably retired. Try again
788 * using a different slot id.
789 */
790 if (slot->slot_nr < slot->table->target_highest_slotid)
791 goto session_recover;
792 goto retry_nowait;
793 case -NFS4ERR_SEQ_MISORDERED:
794 /*
795 * Was the last operation on this sequence interrupted?
796 * If so, retry after bumping the sequence number.
797 */
798 if (interrupted)
799 goto retry_new_seq;
800 /*
801 * Could this slot have been previously retired?
802 * If so, then the server may be expecting seq_nr = 1!
803 */
804 if (slot->seq_nr != 1) {
805 slot->seq_nr = 1;
806 goto retry_nowait;
807 }
808 goto session_recover;
809 default:
810 /* Just update the slot sequence no. */
811 slot->seq_done = 1;
812 }
813 out:
814 /* The session may be reset by one of the error handlers. */
815 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
816 out_noaction:
817 return ret;
818 session_recover:
819 nfs4_schedule_session_recovery(session, res->sr_status);
820 goto retry_nowait;
821 retry_new_seq:
822 ++slot->seq_nr;
823 retry_nowait:
824 if (rpc_restart_call_prepare(task)) {
825 nfs41_sequence_free_slot(res);
826 task->tk_status = 0;
827 ret = 0;
828 }
829 goto out;
830 out_retry:
831 if (!rpc_restart_call(task))
832 goto out;
833 rpc_delay(task, NFS4_POLL_RETRY_MAX);
834 return 0;
835 }
836
837 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
838 {
839 if (!nfs41_sequence_process(task, res))
840 return 0;
841 if (res->sr_slot != NULL)
842 nfs41_sequence_free_slot(res);
843 return 1;
844
845 }
846 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
847
848 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
849 {
850 if (res->sr_slot == NULL)
851 return 1;
852 if (res->sr_slot->table->session != NULL)
853 return nfs41_sequence_process(task, res);
854 return nfs40_sequence_done(task, res);
855 }
856
857 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
858 {
859 if (res->sr_slot != NULL) {
860 if (res->sr_slot->table->session != NULL)
861 nfs41_sequence_free_slot(res);
862 else
863 nfs40_sequence_free_slot(res);
864 }
865 }
866
867 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
868 {
869 if (res->sr_slot == NULL)
870 return 1;
871 if (!res->sr_slot->table->session)
872 return nfs40_sequence_done(task, res);
873 return nfs41_sequence_done(task, res);
874 }
875 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
876
877 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
878 {
879 struct nfs4_call_sync_data *data = calldata;
880
881 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
882
883 nfs4_setup_sequence(data->seq_server->nfs_client,
884 data->seq_args, data->seq_res, task);
885 }
886
887 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
888 {
889 struct nfs4_call_sync_data *data = calldata;
890
891 nfs41_sequence_done(task, data->seq_res);
892 }
893
894 static const struct rpc_call_ops nfs41_call_sync_ops = {
895 .rpc_call_prepare = nfs41_call_sync_prepare,
896 .rpc_call_done = nfs41_call_sync_done,
897 };
898
899 static void
900 nfs4_sequence_process_interrupted(struct nfs_client *client,
901 struct nfs4_slot *slot, struct rpc_cred *cred)
902 {
903 struct rpc_task *task;
904
905 task = _nfs41_proc_sequence(client, cred, slot, true);
906 if (!IS_ERR(task))
907 rpc_put_task_async(task);
908 }
909
910 #else /* !CONFIG_NFS_V4_1 */
911
912 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
913 {
914 return nfs40_sequence_done(task, res);
915 }
916
917 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
918 {
919 if (res->sr_slot != NULL)
920 nfs40_sequence_free_slot(res);
921 }
922
923 int nfs4_sequence_done(struct rpc_task *task,
924 struct nfs4_sequence_res *res)
925 {
926 return nfs40_sequence_done(task, res);
927 }
928 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
929
930 static void
931 nfs4_sequence_process_interrupted(struct nfs_client *client,
932 struct nfs4_slot *slot, struct rpc_cred *cred)
933 {
934 WARN_ON_ONCE(1);
935 slot->interrupted = 0;
936 }
937
938 #endif /* !CONFIG_NFS_V4_1 */
939
940 static
941 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
942 struct nfs4_sequence_res *res,
943 struct nfs4_slot *slot)
944 {
945 if (!slot)
946 return;
947 slot->privileged = args->sa_privileged ? 1 : 0;
948 args->sa_slot = slot;
949
950 res->sr_slot = slot;
951 res->sr_timestamp = jiffies;
952 res->sr_status_flags = 0;
953 res->sr_status = 1;
954
955 }
956
957 int nfs4_setup_sequence(struct nfs_client *client,
958 struct nfs4_sequence_args *args,
959 struct nfs4_sequence_res *res,
960 struct rpc_task *task)
961 {
962 struct nfs4_session *session = nfs4_get_session(client);
963 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
964 struct nfs4_slot *slot;
965
966 /* slot already allocated? */
967 if (res->sr_slot != NULL)
968 goto out_start;
969
970 if (session) {
971 tbl = &session->fc_slot_table;
972 task->tk_timeout = 0;
973 }
974
975 for (;;) {
976 spin_lock(&tbl->slot_tbl_lock);
977 /* The state manager will wait until the slot table is empty */
978 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
979 goto out_sleep;
980
981 slot = nfs4_alloc_slot(tbl);
982 if (IS_ERR(slot)) {
983 /* Try again in 1/4 second */
984 if (slot == ERR_PTR(-ENOMEM))
985 task->tk_timeout = HZ >> 2;
986 goto out_sleep;
987 }
988 spin_unlock(&tbl->slot_tbl_lock);
989
990 if (likely(!slot->interrupted))
991 break;
992 nfs4_sequence_process_interrupted(client,
993 slot, task->tk_msg.rpc_cred);
994 }
995
996 nfs4_sequence_attach_slot(args, res, slot);
997
998 trace_nfs4_setup_sequence(session, args);
999 out_start:
1000 rpc_call_start(task);
1001 return 0;
1002
1003 out_sleep:
1004 if (args->sa_privileged)
1005 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1006 NULL, RPC_PRIORITY_PRIVILEGED);
1007 else
1008 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1009 spin_unlock(&tbl->slot_tbl_lock);
1010 return -EAGAIN;
1011 }
1012 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1013
1014 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1015 {
1016 struct nfs4_call_sync_data *data = calldata;
1017 nfs4_setup_sequence(data->seq_server->nfs_client,
1018 data->seq_args, data->seq_res, task);
1019 }
1020
1021 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1022 {
1023 struct nfs4_call_sync_data *data = calldata;
1024 nfs4_sequence_done(task, data->seq_res);
1025 }
1026
1027 static const struct rpc_call_ops nfs40_call_sync_ops = {
1028 .rpc_call_prepare = nfs40_call_sync_prepare,
1029 .rpc_call_done = nfs40_call_sync_done,
1030 };
1031
1032 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1033 struct nfs_server *server,
1034 struct rpc_message *msg,
1035 struct nfs4_sequence_args *args,
1036 struct nfs4_sequence_res *res)
1037 {
1038 int ret;
1039 struct rpc_task *task;
1040 struct nfs_client *clp = server->nfs_client;
1041 struct nfs4_call_sync_data data = {
1042 .seq_server = server,
1043 .seq_args = args,
1044 .seq_res = res,
1045 };
1046 struct rpc_task_setup task_setup = {
1047 .rpc_client = clnt,
1048 .rpc_message = msg,
1049 .callback_ops = clp->cl_mvops->call_sync_ops,
1050 .callback_data = &data
1051 };
1052
1053 task = rpc_run_task(&task_setup);
1054 if (IS_ERR(task))
1055 ret = PTR_ERR(task);
1056 else {
1057 ret = task->tk_status;
1058 rpc_put_task(task);
1059 }
1060 return ret;
1061 }
1062
1063 int nfs4_call_sync(struct rpc_clnt *clnt,
1064 struct nfs_server *server,
1065 struct rpc_message *msg,
1066 struct nfs4_sequence_args *args,
1067 struct nfs4_sequence_res *res,
1068 int cache_reply)
1069 {
1070 nfs4_init_sequence(args, res, cache_reply, 0);
1071 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1072 }
1073
1074 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1075 unsigned long timestamp)
1076 {
1077 struct nfs_inode *nfsi = NFS_I(dir);
1078
1079 spin_lock(&dir->i_lock);
1080 nfsi->cache_validity |= NFS_INO_INVALID_CTIME
1081 | NFS_INO_INVALID_MTIME
1082 | NFS_INO_INVALID_DATA;
1083 if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) {
1084 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1085 nfsi->attrtimeo_timestamp = jiffies;
1086 } else {
1087 nfs_force_lookup_revalidate(dir);
1088 if (cinfo->before != inode_peek_iversion_raw(dir))
1089 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
1090 NFS_INO_INVALID_ACL;
1091 }
1092 inode_set_iversion_raw(dir, cinfo->after);
1093 nfsi->read_cache_jiffies = timestamp;
1094 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1095 nfs_fscache_invalidate(dir);
1096 spin_unlock(&dir->i_lock);
1097 }
1098
1099 struct nfs4_open_createattrs {
1100 struct nfs4_label *label;
1101 struct iattr *sattr;
1102 const __u32 verf[2];
1103 };
1104
1105 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1106 int err, struct nfs4_exception *exception)
1107 {
1108 if (err != -EINVAL)
1109 return false;
1110 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1111 return false;
1112 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1113 exception->retry = 1;
1114 return true;
1115 }
1116
1117 static u32
1118 nfs4_map_atomic_open_share(struct nfs_server *server,
1119 fmode_t fmode, int openflags)
1120 {
1121 u32 res = 0;
1122
1123 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1124 case FMODE_READ:
1125 res = NFS4_SHARE_ACCESS_READ;
1126 break;
1127 case FMODE_WRITE:
1128 res = NFS4_SHARE_ACCESS_WRITE;
1129 break;
1130 case FMODE_READ|FMODE_WRITE:
1131 res = NFS4_SHARE_ACCESS_BOTH;
1132 }
1133 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1134 goto out;
1135 /* Want no delegation if we're using O_DIRECT */
1136 if (openflags & O_DIRECT)
1137 res |= NFS4_SHARE_WANT_NO_DELEG;
1138 out:
1139 return res;
1140 }
1141
1142 static enum open_claim_type4
1143 nfs4_map_atomic_open_claim(struct nfs_server *server,
1144 enum open_claim_type4 claim)
1145 {
1146 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1147 return claim;
1148 switch (claim) {
1149 default:
1150 return claim;
1151 case NFS4_OPEN_CLAIM_FH:
1152 return NFS4_OPEN_CLAIM_NULL;
1153 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1154 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1155 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1156 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1157 }
1158 }
1159
1160 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1161 {
1162 p->o_res.f_attr = &p->f_attr;
1163 p->o_res.f_label = p->f_label;
1164 p->o_res.seqid = p->o_arg.seqid;
1165 p->c_res.seqid = p->c_arg.seqid;
1166 p->o_res.server = p->o_arg.server;
1167 p->o_res.access_request = p->o_arg.access;
1168 nfs_fattr_init(&p->f_attr);
1169 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1170 }
1171
1172 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1173 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1174 const struct nfs4_open_createattrs *c,
1175 enum open_claim_type4 claim,
1176 gfp_t gfp_mask)
1177 {
1178 struct dentry *parent = dget_parent(dentry);
1179 struct inode *dir = d_inode(parent);
1180 struct nfs_server *server = NFS_SERVER(dir);
1181 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1182 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1183 struct nfs4_opendata *p;
1184
1185 p = kzalloc(sizeof(*p), gfp_mask);
1186 if (p == NULL)
1187 goto err;
1188
1189 p->f_label = nfs4_label_alloc(server, gfp_mask);
1190 if (IS_ERR(p->f_label))
1191 goto err_free_p;
1192
1193 p->a_label = nfs4_label_alloc(server, gfp_mask);
1194 if (IS_ERR(p->a_label))
1195 goto err_free_f;
1196
1197 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1198 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1199 if (IS_ERR(p->o_arg.seqid))
1200 goto err_free_label;
1201 nfs_sb_active(dentry->d_sb);
1202 p->dentry = dget(dentry);
1203 p->dir = parent;
1204 p->owner = sp;
1205 atomic_inc(&sp->so_count);
1206 p->o_arg.open_flags = flags;
1207 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1208 p->o_arg.umask = current_umask();
1209 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1210 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1211 fmode, flags);
1212 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1213 * will return permission denied for all bits until close */
1214 if (!(flags & O_EXCL)) {
1215 /* ask server to check for all possible rights as results
1216 * are cached */
1217 switch (p->o_arg.claim) {
1218 default:
1219 break;
1220 case NFS4_OPEN_CLAIM_NULL:
1221 case NFS4_OPEN_CLAIM_FH:
1222 p->o_arg.access = NFS4_ACCESS_READ |
1223 NFS4_ACCESS_MODIFY |
1224 NFS4_ACCESS_EXTEND |
1225 NFS4_ACCESS_EXECUTE;
1226 }
1227 }
1228 p->o_arg.clientid = server->nfs_client->cl_clientid;
1229 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1230 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1231 p->o_arg.name = &dentry->d_name;
1232 p->o_arg.server = server;
1233 p->o_arg.bitmask = nfs4_bitmask(server, label);
1234 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1235 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1236 switch (p->o_arg.claim) {
1237 case NFS4_OPEN_CLAIM_NULL:
1238 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1239 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1240 p->o_arg.fh = NFS_FH(dir);
1241 break;
1242 case NFS4_OPEN_CLAIM_PREVIOUS:
1243 case NFS4_OPEN_CLAIM_FH:
1244 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1245 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1246 p->o_arg.fh = NFS_FH(d_inode(dentry));
1247 }
1248 if (c != NULL && c->sattr != NULL && c->sattr->ia_valid != 0) {
1249 p->o_arg.u.attrs = &p->attrs;
1250 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1251
1252 memcpy(p->o_arg.u.verifier.data, c->verf,
1253 sizeof(p->o_arg.u.verifier.data));
1254 }
1255 p->c_arg.fh = &p->o_res.fh;
1256 p->c_arg.stateid = &p->o_res.stateid;
1257 p->c_arg.seqid = p->o_arg.seqid;
1258 nfs4_init_opendata_res(p);
1259 kref_init(&p->kref);
1260 return p;
1261
1262 err_free_label:
1263 nfs4_label_free(p->a_label);
1264 err_free_f:
1265 nfs4_label_free(p->f_label);
1266 err_free_p:
1267 kfree(p);
1268 err:
1269 dput(parent);
1270 return NULL;
1271 }
1272
1273 static void nfs4_opendata_free(struct kref *kref)
1274 {
1275 struct nfs4_opendata *p = container_of(kref,
1276 struct nfs4_opendata, kref);
1277 struct super_block *sb = p->dentry->d_sb;
1278
1279 nfs4_lgopen_release(p->lgp);
1280 nfs_free_seqid(p->o_arg.seqid);
1281 nfs4_sequence_free_slot(&p->o_res.seq_res);
1282 if (p->state != NULL)
1283 nfs4_put_open_state(p->state);
1284 nfs4_put_state_owner(p->owner);
1285
1286 nfs4_label_free(p->a_label);
1287 nfs4_label_free(p->f_label);
1288
1289 dput(p->dir);
1290 dput(p->dentry);
1291 nfs_sb_deactive(sb);
1292 nfs_fattr_free_names(&p->f_attr);
1293 kfree(p->f_attr.mdsthreshold);
1294 kfree(p);
1295 }
1296
1297 static void nfs4_opendata_put(struct nfs4_opendata *p)
1298 {
1299 if (p != NULL)
1300 kref_put(&p->kref, nfs4_opendata_free);
1301 }
1302
1303 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1304 fmode_t fmode)
1305 {
1306 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1307 case FMODE_READ|FMODE_WRITE:
1308 return state->n_rdwr != 0;
1309 case FMODE_WRITE:
1310 return state->n_wronly != 0;
1311 case FMODE_READ:
1312 return state->n_rdonly != 0;
1313 }
1314 WARN_ON_ONCE(1);
1315 return false;
1316 }
1317
1318 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1319 {
1320 int ret = 0;
1321
1322 if (open_mode & (O_EXCL|O_TRUNC))
1323 goto out;
1324 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1325 case FMODE_READ:
1326 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1327 && state->n_rdonly != 0;
1328 break;
1329 case FMODE_WRITE:
1330 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1331 && state->n_wronly != 0;
1332 break;
1333 case FMODE_READ|FMODE_WRITE:
1334 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1335 && state->n_rdwr != 0;
1336 }
1337 out:
1338 return ret;
1339 }
1340
1341 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1342 enum open_claim_type4 claim)
1343 {
1344 if (delegation == NULL)
1345 return 0;
1346 if ((delegation->type & fmode) != fmode)
1347 return 0;
1348 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1349 return 0;
1350 switch (claim) {
1351 case NFS4_OPEN_CLAIM_NULL:
1352 case NFS4_OPEN_CLAIM_FH:
1353 break;
1354 case NFS4_OPEN_CLAIM_PREVIOUS:
1355 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1356 break;
1357 default:
1358 return 0;
1359 }
1360 nfs_mark_delegation_referenced(delegation);
1361 return 1;
1362 }
1363
1364 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1365 {
1366 switch (fmode) {
1367 case FMODE_WRITE:
1368 state->n_wronly++;
1369 break;
1370 case FMODE_READ:
1371 state->n_rdonly++;
1372 break;
1373 case FMODE_READ|FMODE_WRITE:
1374 state->n_rdwr++;
1375 }
1376 nfs4_state_set_mode_locked(state, state->state | fmode);
1377 }
1378
1379 #ifdef CONFIG_NFS_V4_1
1380 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1381 {
1382 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1383 return true;
1384 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1385 return true;
1386 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1387 return true;
1388 return false;
1389 }
1390 #endif /* CONFIG_NFS_V4_1 */
1391
1392 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1393 {
1394 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1395 wake_up_all(&state->waitq);
1396 }
1397
1398 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state,
1399 const nfs4_stateid *stateid)
1400 {
1401 u32 state_seqid = be32_to_cpu(state->open_stateid.seqid);
1402 u32 stateid_seqid = be32_to_cpu(stateid->seqid);
1403
1404 if (stateid_seqid == state_seqid + 1U ||
1405 (stateid_seqid == 1U && state_seqid == 0xffffffffU))
1406 nfs_state_log_update_open_stateid(state);
1407 else
1408 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1409 }
1410
1411 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1412 {
1413 struct nfs_client *clp = state->owner->so_server->nfs_client;
1414 bool need_recover = false;
1415
1416 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1417 need_recover = true;
1418 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1419 need_recover = true;
1420 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1421 need_recover = true;
1422 if (need_recover)
1423 nfs4_state_mark_reclaim_nograce(clp, state);
1424 }
1425
1426 /*
1427 * Check for whether or not the caller may update the open stateid
1428 * to the value passed in by stateid.
1429 *
1430 * Note: This function relies heavily on the server implementing
1431 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1432 * correctly.
1433 * i.e. The stateid seqids have to be initialised to 1, and
1434 * are then incremented on every state transition.
1435 */
1436 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1437 const nfs4_stateid *stateid)
1438 {
1439 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 ||
1440 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1441 if (stateid->seqid == cpu_to_be32(1))
1442 nfs_state_log_update_open_stateid(state);
1443 else
1444 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1445 return true;
1446 }
1447
1448 if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1449 nfs_state_log_out_of_order_open_stateid(state, stateid);
1450 return true;
1451 }
1452 return false;
1453 }
1454
1455 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1456 {
1457 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1458 return;
1459 if (state->n_wronly)
1460 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1461 if (state->n_rdonly)
1462 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1463 if (state->n_rdwr)
1464 set_bit(NFS_O_RDWR_STATE, &state->flags);
1465 set_bit(NFS_OPEN_STATE, &state->flags);
1466 }
1467
1468 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1469 nfs4_stateid *stateid, fmode_t fmode)
1470 {
1471 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1472 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1473 case FMODE_WRITE:
1474 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1475 break;
1476 case FMODE_READ:
1477 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1478 break;
1479 case 0:
1480 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1481 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1482 clear_bit(NFS_OPEN_STATE, &state->flags);
1483 }
1484 if (stateid == NULL)
1485 return;
1486 /* Handle OPEN+OPEN_DOWNGRADE races */
1487 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1488 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1489 nfs_resync_open_stateid_locked(state);
1490 goto out;
1491 }
1492 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1493 nfs4_stateid_copy(&state->stateid, stateid);
1494 nfs4_stateid_copy(&state->open_stateid, stateid);
1495 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1496 out:
1497 nfs_state_log_update_open_stateid(state);
1498 }
1499
1500 static void nfs_clear_open_stateid(struct nfs4_state *state,
1501 nfs4_stateid *arg_stateid,
1502 nfs4_stateid *stateid, fmode_t fmode)
1503 {
1504 write_seqlock(&state->seqlock);
1505 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1506 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1507 nfs_clear_open_stateid_locked(state, stateid, fmode);
1508 write_sequnlock(&state->seqlock);
1509 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1510 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1511 }
1512
1513 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1514 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1515 {
1516 DEFINE_WAIT(wait);
1517 int status = 0;
1518 for (;;) {
1519
1520 if (!nfs_need_update_open_stateid(state, stateid))
1521 return;
1522 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1523 break;
1524 if (status)
1525 break;
1526 /* Rely on seqids for serialisation with NFSv4.0 */
1527 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1528 break;
1529
1530 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1531 /*
1532 * Ensure we process the state changes in the same order
1533 * in which the server processed them by delaying the
1534 * update of the stateid until we are in sequence.
1535 */
1536 write_sequnlock(&state->seqlock);
1537 spin_unlock(&state->owner->so_lock);
1538 rcu_read_unlock();
1539 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1540 if (!signal_pending(current)) {
1541 if (schedule_timeout(5*HZ) == 0)
1542 status = -EAGAIN;
1543 else
1544 status = 0;
1545 } else
1546 status = -EINTR;
1547 finish_wait(&state->waitq, &wait);
1548 rcu_read_lock();
1549 spin_lock(&state->owner->so_lock);
1550 write_seqlock(&state->seqlock);
1551 }
1552
1553 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1554 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1555 nfs4_stateid_copy(freeme, &state->open_stateid);
1556 nfs_test_and_clear_all_open_stateid(state);
1557 }
1558
1559 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1560 nfs4_stateid_copy(&state->stateid, stateid);
1561 nfs4_stateid_copy(&state->open_stateid, stateid);
1562 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1563 nfs_state_log_update_open_stateid(state);
1564 }
1565
1566 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1567 const nfs4_stateid *open_stateid,
1568 fmode_t fmode,
1569 nfs4_stateid *freeme)
1570 {
1571 /*
1572 * Protect the call to nfs4_state_set_mode_locked and
1573 * serialise the stateid update
1574 */
1575 write_seqlock(&state->seqlock);
1576 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1577 switch (fmode) {
1578 case FMODE_READ:
1579 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1580 break;
1581 case FMODE_WRITE:
1582 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1583 break;
1584 case FMODE_READ|FMODE_WRITE:
1585 set_bit(NFS_O_RDWR_STATE, &state->flags);
1586 }
1587 set_bit(NFS_OPEN_STATE, &state->flags);
1588 write_sequnlock(&state->seqlock);
1589 }
1590
1591 static void nfs_state_set_delegation(struct nfs4_state *state,
1592 const nfs4_stateid *deleg_stateid,
1593 fmode_t fmode)
1594 {
1595 /*
1596 * Protect the call to nfs4_state_set_mode_locked and
1597 * serialise the stateid update
1598 */
1599 write_seqlock(&state->seqlock);
1600 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1601 set_bit(NFS_DELEGATED_STATE, &state->flags);
1602 write_sequnlock(&state->seqlock);
1603 }
1604
1605 static int update_open_stateid(struct nfs4_state *state,
1606 const nfs4_stateid *open_stateid,
1607 const nfs4_stateid *delegation,
1608 fmode_t fmode)
1609 {
1610 struct nfs_server *server = NFS_SERVER(state->inode);
1611 struct nfs_client *clp = server->nfs_client;
1612 struct nfs_inode *nfsi = NFS_I(state->inode);
1613 struct nfs_delegation *deleg_cur;
1614 nfs4_stateid freeme = { };
1615 int ret = 0;
1616
1617 fmode &= (FMODE_READ|FMODE_WRITE);
1618
1619 rcu_read_lock();
1620 spin_lock(&state->owner->so_lock);
1621 if (open_stateid != NULL) {
1622 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1623 ret = 1;
1624 }
1625
1626 deleg_cur = rcu_dereference(nfsi->delegation);
1627 if (deleg_cur == NULL)
1628 goto no_delegation;
1629
1630 spin_lock(&deleg_cur->lock);
1631 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1632 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1633 (deleg_cur->type & fmode) != fmode)
1634 goto no_delegation_unlock;
1635
1636 if (delegation == NULL)
1637 delegation = &deleg_cur->stateid;
1638 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1639 goto no_delegation_unlock;
1640
1641 nfs_mark_delegation_referenced(deleg_cur);
1642 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1643 ret = 1;
1644 no_delegation_unlock:
1645 spin_unlock(&deleg_cur->lock);
1646 no_delegation:
1647 if (ret)
1648 update_open_stateflags(state, fmode);
1649 spin_unlock(&state->owner->so_lock);
1650 rcu_read_unlock();
1651
1652 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1653 nfs4_schedule_state_manager(clp);
1654 if (freeme.type != 0)
1655 nfs4_test_and_free_stateid(server, &freeme,
1656 state->owner->so_cred);
1657
1658 return ret;
1659 }
1660
1661 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1662 const nfs4_stateid *stateid)
1663 {
1664 struct nfs4_state *state = lsp->ls_state;
1665 bool ret = false;
1666
1667 spin_lock(&state->state_lock);
1668 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1669 goto out_noupdate;
1670 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1671 goto out_noupdate;
1672 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1673 ret = true;
1674 out_noupdate:
1675 spin_unlock(&state->state_lock);
1676 return ret;
1677 }
1678
1679 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1680 {
1681 struct nfs_delegation *delegation;
1682
1683 fmode &= FMODE_READ|FMODE_WRITE;
1684 rcu_read_lock();
1685 delegation = rcu_dereference(NFS_I(inode)->delegation);
1686 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1687 rcu_read_unlock();
1688 return;
1689 }
1690 rcu_read_unlock();
1691 nfs4_inode_return_delegation(inode);
1692 }
1693
1694 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1695 {
1696 struct nfs4_state *state = opendata->state;
1697 struct nfs_inode *nfsi = NFS_I(state->inode);
1698 struct nfs_delegation *delegation;
1699 int open_mode = opendata->o_arg.open_flags;
1700 fmode_t fmode = opendata->o_arg.fmode;
1701 enum open_claim_type4 claim = opendata->o_arg.claim;
1702 nfs4_stateid stateid;
1703 int ret = -EAGAIN;
1704
1705 for (;;) {
1706 spin_lock(&state->owner->so_lock);
1707 if (can_open_cached(state, fmode, open_mode)) {
1708 update_open_stateflags(state, fmode);
1709 spin_unlock(&state->owner->so_lock);
1710 goto out_return_state;
1711 }
1712 spin_unlock(&state->owner->so_lock);
1713 rcu_read_lock();
1714 delegation = rcu_dereference(nfsi->delegation);
1715 if (!can_open_delegated(delegation, fmode, claim)) {
1716 rcu_read_unlock();
1717 break;
1718 }
1719 /* Save the delegation */
1720 nfs4_stateid_copy(&stateid, &delegation->stateid);
1721 rcu_read_unlock();
1722 nfs_release_seqid(opendata->o_arg.seqid);
1723 if (!opendata->is_recover) {
1724 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1725 if (ret != 0)
1726 goto out;
1727 }
1728 ret = -EAGAIN;
1729
1730 /* Try to update the stateid using the delegation */
1731 if (update_open_stateid(state, NULL, &stateid, fmode))
1732 goto out_return_state;
1733 }
1734 out:
1735 return ERR_PTR(ret);
1736 out_return_state:
1737 atomic_inc(&state->count);
1738 return state;
1739 }
1740
1741 static void
1742 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1743 {
1744 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1745 struct nfs_delegation *delegation;
1746 int delegation_flags = 0;
1747
1748 rcu_read_lock();
1749 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1750 if (delegation)
1751 delegation_flags = delegation->flags;
1752 rcu_read_unlock();
1753 switch (data->o_arg.claim) {
1754 default:
1755 break;
1756 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1757 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1758 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1759 "returning a delegation for "
1760 "OPEN(CLAIM_DELEGATE_CUR)\n",
1761 clp->cl_hostname);
1762 return;
1763 }
1764 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1765 nfs_inode_set_delegation(state->inode,
1766 data->owner->so_cred,
1767 data->o_res.delegation_type,
1768 &data->o_res.delegation,
1769 data->o_res.pagemod_limit);
1770 else
1771 nfs_inode_reclaim_delegation(state->inode,
1772 data->owner->so_cred,
1773 data->o_res.delegation_type,
1774 &data->o_res.delegation,
1775 data->o_res.pagemod_limit);
1776 }
1777
1778 /*
1779 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1780 * and update the nfs4_state.
1781 */
1782 static struct nfs4_state *
1783 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1784 {
1785 struct inode *inode = data->state->inode;
1786 struct nfs4_state *state = data->state;
1787 int ret;
1788
1789 if (!data->rpc_done) {
1790 if (data->rpc_status)
1791 return ERR_PTR(data->rpc_status);
1792 /* cached opens have already been processed */
1793 goto update;
1794 }
1795
1796 ret = nfs_refresh_inode(inode, &data->f_attr);
1797 if (ret)
1798 return ERR_PTR(ret);
1799
1800 if (data->o_res.delegation_type != 0)
1801 nfs4_opendata_check_deleg(data, state);
1802 update:
1803 update_open_stateid(state, &data->o_res.stateid, NULL,
1804 data->o_arg.fmode);
1805 atomic_inc(&state->count);
1806
1807 return state;
1808 }
1809
1810 static struct inode *
1811 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1812 {
1813 struct inode *inode;
1814
1815 switch (data->o_arg.claim) {
1816 case NFS4_OPEN_CLAIM_NULL:
1817 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1818 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1819 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1820 return ERR_PTR(-EAGAIN);
1821 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
1822 &data->f_attr, data->f_label);
1823 break;
1824 default:
1825 inode = d_inode(data->dentry);
1826 ihold(inode);
1827 nfs_refresh_inode(inode, &data->f_attr);
1828 }
1829 return inode;
1830 }
1831
1832 static struct nfs4_state *
1833 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
1834 {
1835 struct nfs4_state *state;
1836 struct inode *inode;
1837
1838 inode = nfs4_opendata_get_inode(data);
1839 if (IS_ERR(inode))
1840 return ERR_CAST(inode);
1841 if (data->state != NULL && data->state->inode == inode) {
1842 state = data->state;
1843 atomic_inc(&state->count);
1844 } else
1845 state = nfs4_get_open_state(inode, data->owner);
1846 iput(inode);
1847 if (state == NULL)
1848 state = ERR_PTR(-ENOMEM);
1849 return state;
1850 }
1851
1852 static struct nfs4_state *
1853 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1854 {
1855 struct nfs4_state *state;
1856
1857 if (!data->rpc_done) {
1858 state = nfs4_try_open_cached(data);
1859 trace_nfs4_cached_open(data->state);
1860 goto out;
1861 }
1862
1863 state = nfs4_opendata_find_nfs4_state(data);
1864 if (IS_ERR(state))
1865 goto out;
1866
1867 if (data->o_res.delegation_type != 0)
1868 nfs4_opendata_check_deleg(data, state);
1869 update_open_stateid(state, &data->o_res.stateid, NULL,
1870 data->o_arg.fmode);
1871 out:
1872 nfs_release_seqid(data->o_arg.seqid);
1873 return state;
1874 }
1875
1876 static struct nfs4_state *
1877 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1878 {
1879 struct nfs4_state *ret;
1880
1881 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1882 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
1883 else
1884 ret = _nfs4_opendata_to_nfs4_state(data);
1885 nfs4_sequence_free_slot(&data->o_res.seq_res);
1886 return ret;
1887 }
1888
1889 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1890 {
1891 struct nfs_inode *nfsi = NFS_I(state->inode);
1892 struct nfs_open_context *ctx;
1893
1894 spin_lock(&state->inode->i_lock);
1895 list_for_each_entry(ctx, &nfsi->open_files, list) {
1896 if (ctx->state != state)
1897 continue;
1898 get_nfs_open_context(ctx);
1899 spin_unlock(&state->inode->i_lock);
1900 return ctx;
1901 }
1902 spin_unlock(&state->inode->i_lock);
1903 return ERR_PTR(-ENOENT);
1904 }
1905
1906 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1907 struct nfs4_state *state, enum open_claim_type4 claim)
1908 {
1909 struct nfs4_opendata *opendata;
1910
1911 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1912 NULL, claim, GFP_NOFS);
1913 if (opendata == NULL)
1914 return ERR_PTR(-ENOMEM);
1915 opendata->state = state;
1916 atomic_inc(&state->count);
1917 return opendata;
1918 }
1919
1920 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1921 fmode_t fmode)
1922 {
1923 struct nfs4_state *newstate;
1924 int ret;
1925
1926 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1927 return 0;
1928 opendata->o_arg.open_flags = 0;
1929 opendata->o_arg.fmode = fmode;
1930 opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1931 NFS_SB(opendata->dentry->d_sb),
1932 fmode, 0);
1933 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1934 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1935 nfs4_init_opendata_res(opendata);
1936 ret = _nfs4_recover_proc_open(opendata);
1937 if (ret != 0)
1938 return ret;
1939 newstate = nfs4_opendata_to_nfs4_state(opendata);
1940 if (IS_ERR(newstate))
1941 return PTR_ERR(newstate);
1942 if (newstate != opendata->state)
1943 ret = -ESTALE;
1944 nfs4_close_state(newstate, fmode);
1945 return ret;
1946 }
1947
1948 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1949 {
1950 int ret;
1951
1952 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1953 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1954 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1955 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1956 /* memory barrier prior to reading state->n_* */
1957 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1958 clear_bit(NFS_OPEN_STATE, &state->flags);
1959 smp_rmb();
1960 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1961 if (ret != 0)
1962 return ret;
1963 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1964 if (ret != 0)
1965 return ret;
1966 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1967 if (ret != 0)
1968 return ret;
1969 /*
1970 * We may have performed cached opens for all three recoveries.
1971 * Check if we need to update the current stateid.
1972 */
1973 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1974 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1975 write_seqlock(&state->seqlock);
1976 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1977 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1978 write_sequnlock(&state->seqlock);
1979 }
1980 return 0;
1981 }
1982
1983 /*
1984 * OPEN_RECLAIM:
1985 * reclaim state on the server after a reboot.
1986 */
1987 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1988 {
1989 struct nfs_delegation *delegation;
1990 struct nfs4_opendata *opendata;
1991 fmode_t delegation_type = 0;
1992 int status;
1993
1994 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1995 NFS4_OPEN_CLAIM_PREVIOUS);
1996 if (IS_ERR(opendata))
1997 return PTR_ERR(opendata);
1998 rcu_read_lock();
1999 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2000 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2001 delegation_type = delegation->type;
2002 rcu_read_unlock();
2003 opendata->o_arg.u.delegation_type = delegation_type;
2004 status = nfs4_open_recover(opendata, state);
2005 nfs4_opendata_put(opendata);
2006 return status;
2007 }
2008
2009 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2010 {
2011 struct nfs_server *server = NFS_SERVER(state->inode);
2012 struct nfs4_exception exception = { };
2013 int err;
2014 do {
2015 err = _nfs4_do_open_reclaim(ctx, state);
2016 trace_nfs4_open_reclaim(ctx, 0, err);
2017 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2018 continue;
2019 if (err != -NFS4ERR_DELAY)
2020 break;
2021 nfs4_handle_exception(server, err, &exception);
2022 } while (exception.retry);
2023 return err;
2024 }
2025
2026 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2027 {
2028 struct nfs_open_context *ctx;
2029 int ret;
2030
2031 ctx = nfs4_state_find_open_context(state);
2032 if (IS_ERR(ctx))
2033 return -EAGAIN;
2034 ret = nfs4_do_open_reclaim(ctx, state);
2035 put_nfs_open_context(ctx);
2036 return ret;
2037 }
2038
2039 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)
2040 {
2041 switch (err) {
2042 default:
2043 printk(KERN_ERR "NFS: %s: unhandled error "
2044 "%d.\n", __func__, err);
2045 case 0:
2046 case -ENOENT:
2047 case -EAGAIN:
2048 case -ESTALE:
2049 break;
2050 case -NFS4ERR_BADSESSION:
2051 case -NFS4ERR_BADSLOT:
2052 case -NFS4ERR_BAD_HIGH_SLOT:
2053 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2054 case -NFS4ERR_DEADSESSION:
2055 set_bit(NFS_DELEGATED_STATE, &state->flags);
2056 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
2057 return -EAGAIN;
2058 case -NFS4ERR_STALE_CLIENTID:
2059 case -NFS4ERR_STALE_STATEID:
2060 set_bit(NFS_DELEGATED_STATE, &state->flags);
2061 /* Don't recall a delegation if it was lost */
2062 nfs4_schedule_lease_recovery(server->nfs_client);
2063 return -EAGAIN;
2064 case -NFS4ERR_MOVED:
2065 nfs4_schedule_migration_recovery(server);
2066 return -EAGAIN;
2067 case -NFS4ERR_LEASE_MOVED:
2068 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2069 return -EAGAIN;
2070 case -NFS4ERR_DELEG_REVOKED:
2071 case -NFS4ERR_ADMIN_REVOKED:
2072 case -NFS4ERR_EXPIRED:
2073 case -NFS4ERR_BAD_STATEID:
2074 case -NFS4ERR_OPENMODE:
2075 nfs_inode_find_state_and_recover(state->inode,
2076 stateid);
2077 nfs4_schedule_stateid_recovery(server, state);
2078 return -EAGAIN;
2079 case -NFS4ERR_DELAY:
2080 case -NFS4ERR_GRACE:
2081 set_bit(NFS_DELEGATED_STATE, &state->flags);
2082 ssleep(1);
2083 return -EAGAIN;
2084 case -ENOMEM:
2085 case -NFS4ERR_DENIED:
2086 if (fl) {
2087 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2088 if (lsp)
2089 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2090 }
2091 return 0;
2092 }
2093 return err;
2094 }
2095
2096 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2097 struct nfs4_state *state, const nfs4_stateid *stateid,
2098 fmode_t type)
2099 {
2100 struct nfs_server *server = NFS_SERVER(state->inode);
2101 struct nfs4_opendata *opendata;
2102 int err = 0;
2103
2104 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2105 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2106 if (IS_ERR(opendata))
2107 return PTR_ERR(opendata);
2108 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2109 write_seqlock(&state->seqlock);
2110 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2111 write_sequnlock(&state->seqlock);
2112 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2113 switch (type & (FMODE_READ|FMODE_WRITE)) {
2114 case FMODE_READ|FMODE_WRITE:
2115 case FMODE_WRITE:
2116 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2117 if (err)
2118 break;
2119 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2120 if (err)
2121 break;
2122 case FMODE_READ:
2123 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2124 }
2125 nfs4_opendata_put(opendata);
2126 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2127 }
2128
2129 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2130 {
2131 struct nfs4_opendata *data = calldata;
2132
2133 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2134 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2135 }
2136
2137 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2138 {
2139 struct nfs4_opendata *data = calldata;
2140
2141 nfs40_sequence_done(task, &data->c_res.seq_res);
2142
2143 data->rpc_status = task->tk_status;
2144 if (data->rpc_status == 0) {
2145 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2146 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2147 renew_lease(data->o_res.server, data->timestamp);
2148 data->rpc_done = true;
2149 }
2150 }
2151
2152 static void nfs4_open_confirm_release(void *calldata)
2153 {
2154 struct nfs4_opendata *data = calldata;
2155 struct nfs4_state *state = NULL;
2156
2157 /* If this request hasn't been cancelled, do nothing */
2158 if (!data->cancelled)
2159 goto out_free;
2160 /* In case of error, no cleanup! */
2161 if (!data->rpc_done)
2162 goto out_free;
2163 state = nfs4_opendata_to_nfs4_state(data);
2164 if (!IS_ERR(state))
2165 nfs4_close_state(state, data->o_arg.fmode);
2166 out_free:
2167 nfs4_opendata_put(data);
2168 }
2169
2170 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2171 .rpc_call_prepare = nfs4_open_confirm_prepare,
2172 .rpc_call_done = nfs4_open_confirm_done,
2173 .rpc_release = nfs4_open_confirm_release,
2174 };
2175
2176 /*
2177 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2178 */
2179 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2180 {
2181 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2182 struct rpc_task *task;
2183 struct rpc_message msg = {
2184 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2185 .rpc_argp = &data->c_arg,
2186 .rpc_resp = &data->c_res,
2187 .rpc_cred = data->owner->so_cred,
2188 };
2189 struct rpc_task_setup task_setup_data = {
2190 .rpc_client = server->client,
2191 .rpc_message = &msg,
2192 .callback_ops = &nfs4_open_confirm_ops,
2193 .callback_data = data,
2194 .workqueue = nfsiod_workqueue,
2195 .flags = RPC_TASK_ASYNC,
2196 };
2197 int status;
2198
2199 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2200 data->is_recover);
2201 kref_get(&data->kref);
2202 data->rpc_done = false;
2203 data->rpc_status = 0;
2204 data->timestamp = jiffies;
2205 task = rpc_run_task(&task_setup_data);
2206 if (IS_ERR(task))
2207 return PTR_ERR(task);
2208 status = rpc_wait_for_completion_task(task);
2209 if (status != 0) {
2210 data->cancelled = true;
2211 smp_wmb();
2212 } else
2213 status = data->rpc_status;
2214 rpc_put_task(task);
2215 return status;
2216 }
2217
2218 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2219 {
2220 struct nfs4_opendata *data = calldata;
2221 struct nfs4_state_owner *sp = data->owner;
2222 struct nfs_client *clp = sp->so_server->nfs_client;
2223 enum open_claim_type4 claim = data->o_arg.claim;
2224
2225 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2226 goto out_wait;
2227 /*
2228 * Check if we still need to send an OPEN call, or if we can use
2229 * a delegation instead.
2230 */
2231 if (data->state != NULL) {
2232 struct nfs_delegation *delegation;
2233
2234 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
2235 goto out_no_action;
2236 rcu_read_lock();
2237 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2238 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2239 goto unlock_no_action;
2240 rcu_read_unlock();
2241 }
2242 /* Update client id. */
2243 data->o_arg.clientid = clp->cl_clientid;
2244 switch (claim) {
2245 default:
2246 break;
2247 case NFS4_OPEN_CLAIM_PREVIOUS:
2248 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2249 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2250 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2251 case NFS4_OPEN_CLAIM_FH:
2252 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2253 }
2254 data->timestamp = jiffies;
2255 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2256 &data->o_arg.seq_args,
2257 &data->o_res.seq_res,
2258 task) != 0)
2259 nfs_release_seqid(data->o_arg.seqid);
2260
2261 /* Set the create mode (note dependency on the session type) */
2262 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2263 if (data->o_arg.open_flags & O_EXCL) {
2264 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2265 if (nfs4_has_persistent_session(clp))
2266 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2267 else if (clp->cl_mvops->minor_version > 0)
2268 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2269 }
2270 return;
2271 unlock_no_action:
2272 trace_nfs4_cached_open(data->state);
2273 rcu_read_unlock();
2274 out_no_action:
2275 task->tk_action = NULL;
2276 out_wait:
2277 nfs4_sequence_done(task, &data->o_res.seq_res);
2278 }
2279
2280 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2281 {
2282 struct nfs4_opendata *data = calldata;
2283
2284 data->rpc_status = task->tk_status;
2285
2286 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2287 return;
2288
2289 if (task->tk_status == 0) {
2290 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2291 switch (data->o_res.f_attr->mode & S_IFMT) {
2292 case S_IFREG:
2293 break;
2294 case S_IFLNK:
2295 data->rpc_status = -ELOOP;
2296 break;
2297 case S_IFDIR:
2298 data->rpc_status = -EISDIR;
2299 break;
2300 default:
2301 data->rpc_status = -ENOTDIR;
2302 }
2303 }
2304 renew_lease(data->o_res.server, data->timestamp);
2305 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2306 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2307 }
2308 data->rpc_done = true;
2309 }
2310
2311 static void nfs4_open_release(void *calldata)
2312 {
2313 struct nfs4_opendata *data = calldata;
2314 struct nfs4_state *state = NULL;
2315
2316 /* If this request hasn't been cancelled, do nothing */
2317 if (!data->cancelled)
2318 goto out_free;
2319 /* In case of error, no cleanup! */
2320 if (data->rpc_status != 0 || !data->rpc_done)
2321 goto out_free;
2322 /* In case we need an open_confirm, no cleanup! */
2323 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2324 goto out_free;
2325 state = nfs4_opendata_to_nfs4_state(data);
2326 if (!IS_ERR(state))
2327 nfs4_close_state(state, data->o_arg.fmode);
2328 out_free:
2329 nfs4_opendata_put(data);
2330 }
2331
2332 static const struct rpc_call_ops nfs4_open_ops = {
2333 .rpc_call_prepare = nfs4_open_prepare,
2334 .rpc_call_done = nfs4_open_done,
2335 .rpc_release = nfs4_open_release,
2336 };
2337
2338 static int nfs4_run_open_task(struct nfs4_opendata *data,
2339 struct nfs_open_context *ctx)
2340 {
2341 struct inode *dir = d_inode(data->dir);
2342 struct nfs_server *server = NFS_SERVER(dir);
2343 struct nfs_openargs *o_arg = &data->o_arg;
2344 struct nfs_openres *o_res = &data->o_res;
2345 struct rpc_task *task;
2346 struct rpc_message msg = {
2347 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2348 .rpc_argp = o_arg,
2349 .rpc_resp = o_res,
2350 .rpc_cred = data->owner->so_cred,
2351 };
2352 struct rpc_task_setup task_setup_data = {
2353 .rpc_client = server->client,
2354 .rpc_message = &msg,
2355 .callback_ops = &nfs4_open_ops,
2356 .callback_data = data,
2357 .workqueue = nfsiod_workqueue,
2358 .flags = RPC_TASK_ASYNC,
2359 };
2360 int status;
2361
2362 kref_get(&data->kref);
2363 data->rpc_done = false;
2364 data->rpc_status = 0;
2365 data->cancelled = false;
2366 data->is_recover = false;
2367 if (!ctx) {
2368 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2369 data->is_recover = true;
2370 } else {
2371 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2372 pnfs_lgopen_prepare(data, ctx);
2373 }
2374 task = rpc_run_task(&task_setup_data);
2375 if (IS_ERR(task))
2376 return PTR_ERR(task);
2377 status = rpc_wait_for_completion_task(task);
2378 if (status != 0) {
2379 data->cancelled = true;
2380 smp_wmb();
2381 } else
2382 status = data->rpc_status;
2383 rpc_put_task(task);
2384
2385 return status;
2386 }
2387
2388 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2389 {
2390 struct inode *dir = d_inode(data->dir);
2391 struct nfs_openres *o_res = &data->o_res;
2392 int status;
2393
2394 status = nfs4_run_open_task(data, NULL);
2395 if (status != 0 || !data->rpc_done)
2396 return status;
2397
2398 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2399
2400 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2401 status = _nfs4_proc_open_confirm(data);
2402
2403 return status;
2404 }
2405
2406 /*
2407 * Additional permission checks in order to distinguish between an
2408 * open for read, and an open for execute. This works around the
2409 * fact that NFSv4 OPEN treats read and execute permissions as being
2410 * the same.
2411 * Note that in the non-execute case, we want to turn off permission
2412 * checking if we just created a new file (POSIX open() semantics).
2413 */
2414 static int nfs4_opendata_access(struct rpc_cred *cred,
2415 struct nfs4_opendata *opendata,
2416 struct nfs4_state *state, fmode_t fmode,
2417 int openflags)
2418 {
2419 struct nfs_access_entry cache;
2420 u32 mask, flags;
2421
2422 /* access call failed or for some reason the server doesn't
2423 * support any access modes -- defer access call until later */
2424 if (opendata->o_res.access_supported == 0)
2425 return 0;
2426
2427 mask = 0;
2428 /*
2429 * Use openflags to check for exec, because fmode won't
2430 * always have FMODE_EXEC set when file open for exec.
2431 */
2432 if (openflags & __FMODE_EXEC) {
2433 /* ONLY check for exec rights */
2434 if (S_ISDIR(state->inode->i_mode))
2435 mask = NFS4_ACCESS_LOOKUP;
2436 else
2437 mask = NFS4_ACCESS_EXECUTE;
2438 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2439 mask = NFS4_ACCESS_READ;
2440
2441 cache.cred = cred;
2442 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2443 nfs_access_add_cache(state->inode, &cache);
2444
2445 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2446 if ((mask & ~cache.mask & flags) == 0)
2447 return 0;
2448
2449 return -EACCES;
2450 }
2451
2452 /*
2453 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2454 */
2455 static int _nfs4_proc_open(struct nfs4_opendata *data,
2456 struct nfs_open_context *ctx)
2457 {
2458 struct inode *dir = d_inode(data->dir);
2459 struct nfs_server *server = NFS_SERVER(dir);
2460 struct nfs_openargs *o_arg = &data->o_arg;
2461 struct nfs_openres *o_res = &data->o_res;
2462 int status;
2463
2464 status = nfs4_run_open_task(data, ctx);
2465 if (!data->rpc_done)
2466 return status;
2467 if (status != 0) {
2468 if (status == -NFS4ERR_BADNAME &&
2469 !(o_arg->open_flags & O_CREAT))
2470 return -ENOENT;
2471 return status;
2472 }
2473
2474 nfs_fattr_map_and_free_names(server, &data->f_attr);
2475
2476 if (o_arg->open_flags & O_CREAT) {
2477 if (o_arg->open_flags & O_EXCL)
2478 data->file_created = true;
2479 else if (o_res->cinfo.before != o_res->cinfo.after)
2480 data->file_created = true;
2481 if (data->file_created ||
2482 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2483 update_changeattr(dir, &o_res->cinfo,
2484 o_res->f_attr->time_start);
2485 }
2486 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2487 server->caps &= ~NFS_CAP_POSIX_LOCK;
2488 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2489 status = _nfs4_proc_open_confirm(data);
2490 if (status != 0)
2491 return status;
2492 }
2493 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2494 nfs4_sequence_free_slot(&o_res->seq_res);
2495 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr,
2496 o_res->f_label, NULL);
2497 }
2498 return 0;
2499 }
2500
2501 /*
2502 * OPEN_EXPIRED:
2503 * reclaim state on the server after a network partition.
2504 * Assumes caller holds the appropriate lock
2505 */
2506 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2507 {
2508 struct nfs4_opendata *opendata;
2509 int ret;
2510
2511 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2512 NFS4_OPEN_CLAIM_FH);
2513 if (IS_ERR(opendata))
2514 return PTR_ERR(opendata);
2515 ret = nfs4_open_recover(opendata, state);
2516 if (ret == -ESTALE)
2517 d_drop(ctx->dentry);
2518 nfs4_opendata_put(opendata);
2519 return ret;
2520 }
2521
2522 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2523 {
2524 struct nfs_server *server = NFS_SERVER(state->inode);
2525 struct nfs4_exception exception = { };
2526 int err;
2527
2528 do {
2529 err = _nfs4_open_expired(ctx, state);
2530 trace_nfs4_open_expired(ctx, 0, err);
2531 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2532 continue;
2533 switch (err) {
2534 default:
2535 goto out;
2536 case -NFS4ERR_GRACE:
2537 case -NFS4ERR_DELAY:
2538 nfs4_handle_exception(server, err, &exception);
2539 err = 0;
2540 }
2541 } while (exception.retry);
2542 out:
2543 return err;
2544 }
2545
2546 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2547 {
2548 struct nfs_open_context *ctx;
2549 int ret;
2550
2551 ctx = nfs4_state_find_open_context(state);
2552 if (IS_ERR(ctx))
2553 return -EAGAIN;
2554 ret = nfs4_do_open_expired(ctx, state);
2555 put_nfs_open_context(ctx);
2556 return ret;
2557 }
2558
2559 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2560 const nfs4_stateid *stateid)
2561 {
2562 nfs_remove_bad_delegation(state->inode, stateid);
2563 write_seqlock(&state->seqlock);
2564 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2565 write_sequnlock(&state->seqlock);
2566 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2567 }
2568
2569 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2570 {
2571 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2572 nfs_finish_clear_delegation_stateid(state, NULL);
2573 }
2574
2575 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2576 {
2577 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2578 nfs40_clear_delegation_stateid(state);
2579 return nfs4_open_expired(sp, state);
2580 }
2581
2582 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2583 nfs4_stateid *stateid,
2584 struct rpc_cred *cred)
2585 {
2586 return -NFS4ERR_BAD_STATEID;
2587 }
2588
2589 #if defined(CONFIG_NFS_V4_1)
2590 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2591 nfs4_stateid *stateid,
2592 struct rpc_cred *cred)
2593 {
2594 int status;
2595
2596 switch (stateid->type) {
2597 default:
2598 break;
2599 case NFS4_INVALID_STATEID_TYPE:
2600 case NFS4_SPECIAL_STATEID_TYPE:
2601 return -NFS4ERR_BAD_STATEID;
2602 case NFS4_REVOKED_STATEID_TYPE:
2603 goto out_free;
2604 }
2605
2606 status = nfs41_test_stateid(server, stateid, cred);
2607 switch (status) {
2608 case -NFS4ERR_EXPIRED:
2609 case -NFS4ERR_ADMIN_REVOKED:
2610 case -NFS4ERR_DELEG_REVOKED:
2611 break;
2612 default:
2613 return status;
2614 }
2615 out_free:
2616 /* Ack the revoked state to the server */
2617 nfs41_free_stateid(server, stateid, cred, true);
2618 return -NFS4ERR_EXPIRED;
2619 }
2620
2621 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2622 {
2623 struct nfs_server *server = NFS_SERVER(state->inode);
2624 nfs4_stateid stateid;
2625 struct nfs_delegation *delegation;
2626 struct rpc_cred *cred;
2627 int status;
2628
2629 /* Get the delegation credential for use by test/free_stateid */
2630 rcu_read_lock();
2631 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2632 if (delegation == NULL) {
2633 rcu_read_unlock();
2634 return;
2635 }
2636
2637 nfs4_stateid_copy(&stateid, &delegation->stateid);
2638 if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) ||
2639 !test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2640 &delegation->flags)) {
2641 rcu_read_unlock();
2642 nfs_finish_clear_delegation_stateid(state, &stateid);
2643 return;
2644 }
2645
2646 cred = get_rpccred(delegation->cred);
2647 rcu_read_unlock();
2648 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2649 trace_nfs4_test_delegation_stateid(state, NULL, status);
2650 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2651 nfs_finish_clear_delegation_stateid(state, &stateid);
2652
2653 put_rpccred(cred);
2654 }
2655
2656 /**
2657 * nfs41_check_expired_locks - possibly free a lock stateid
2658 *
2659 * @state: NFSv4 state for an inode
2660 *
2661 * Returns NFS_OK if recovery for this stateid is now finished.
2662 * Otherwise a negative NFS4ERR value is returned.
2663 */
2664 static int nfs41_check_expired_locks(struct nfs4_state *state)
2665 {
2666 int status, ret = NFS_OK;
2667 struct nfs4_lock_state *lsp, *prev = NULL;
2668 struct nfs_server *server = NFS_SERVER(state->inode);
2669
2670 if (!test_bit(LK_STATE_IN_USE, &state->flags))
2671 goto out;
2672
2673 spin_lock(&state->state_lock);
2674 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2675 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2676 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
2677
2678 refcount_inc(&lsp->ls_count);
2679 spin_unlock(&state->state_lock);
2680
2681 nfs4_put_lock_state(prev);
2682 prev = lsp;
2683
2684 status = nfs41_test_and_free_expired_stateid(server,
2685 &lsp->ls_stateid,
2686 cred);
2687 trace_nfs4_test_lock_stateid(state, lsp, status);
2688 if (status == -NFS4ERR_EXPIRED ||
2689 status == -NFS4ERR_BAD_STATEID) {
2690 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2691 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2692 if (!recover_lost_locks)
2693 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2694 } else if (status != NFS_OK) {
2695 ret = status;
2696 nfs4_put_lock_state(prev);
2697 goto out;
2698 }
2699 spin_lock(&state->state_lock);
2700 }
2701 }
2702 spin_unlock(&state->state_lock);
2703 nfs4_put_lock_state(prev);
2704 out:
2705 return ret;
2706 }
2707
2708 /**
2709 * nfs41_check_open_stateid - possibly free an open stateid
2710 *
2711 * @state: NFSv4 state for an inode
2712 *
2713 * Returns NFS_OK if recovery for this stateid is now finished.
2714 * Otherwise a negative NFS4ERR value is returned.
2715 */
2716 static int nfs41_check_open_stateid(struct nfs4_state *state)
2717 {
2718 struct nfs_server *server = NFS_SERVER(state->inode);
2719 nfs4_stateid *stateid = &state->open_stateid;
2720 struct rpc_cred *cred = state->owner->so_cred;
2721 int status;
2722
2723 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) {
2724 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) {
2725 if (nfs4_have_delegation(state->inode, state->state))
2726 return NFS_OK;
2727 return -NFS4ERR_OPENMODE;
2728 }
2729 return -NFS4ERR_BAD_STATEID;
2730 }
2731 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2732 trace_nfs4_test_open_stateid(state, NULL, status);
2733 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2734 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2735 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2736 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2737 clear_bit(NFS_OPEN_STATE, &state->flags);
2738 stateid->type = NFS4_INVALID_STATEID_TYPE;
2739 return status;
2740 }
2741 if (nfs_open_stateid_recover_openmode(state))
2742 return -NFS4ERR_OPENMODE;
2743 return NFS_OK;
2744 }
2745
2746 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2747 {
2748 int status;
2749
2750 nfs41_check_delegation_stateid(state);
2751 status = nfs41_check_expired_locks(state);
2752 if (status != NFS_OK)
2753 return status;
2754 status = nfs41_check_open_stateid(state);
2755 if (status != NFS_OK)
2756 status = nfs4_open_expired(sp, state);
2757 return status;
2758 }
2759 #endif
2760
2761 /*
2762 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2763 * fields corresponding to attributes that were used to store the verifier.
2764 * Make sure we clobber those fields in the later setattr call
2765 */
2766 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2767 struct iattr *sattr, struct nfs4_label **label)
2768 {
2769 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2770 __u32 attrset[3];
2771 unsigned ret;
2772 unsigned i;
2773
2774 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2775 attrset[i] = opendata->o_res.attrset[i];
2776 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
2777 attrset[i] &= ~bitmask[i];
2778 }
2779
2780 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
2781 sattr->ia_valid : 0;
2782
2783 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
2784 if (sattr->ia_valid & ATTR_ATIME_SET)
2785 ret |= ATTR_ATIME_SET;
2786 else
2787 ret |= ATTR_ATIME;
2788 }
2789
2790 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
2791 if (sattr->ia_valid & ATTR_MTIME_SET)
2792 ret |= ATTR_MTIME_SET;
2793 else
2794 ret |= ATTR_MTIME;
2795 }
2796
2797 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
2798 *label = NULL;
2799 return ret;
2800 }
2801
2802 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2803 fmode_t fmode,
2804 int flags,
2805 struct nfs_open_context *ctx)
2806 {
2807 struct nfs4_state_owner *sp = opendata->owner;
2808 struct nfs_server *server = sp->so_server;
2809 struct dentry *dentry;
2810 struct nfs4_state *state;
2811 unsigned int seq;
2812 int ret;
2813
2814 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2815
2816 ret = _nfs4_proc_open(opendata, ctx);
2817 if (ret != 0)
2818 goto out;
2819
2820 state = _nfs4_opendata_to_nfs4_state(opendata);
2821 ret = PTR_ERR(state);
2822 if (IS_ERR(state))
2823 goto out;
2824 ctx->state = state;
2825 if (server->caps & NFS_CAP_POSIX_LOCK)
2826 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2827 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
2828 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
2829
2830 dentry = opendata->dentry;
2831 if (d_really_is_negative(dentry)) {
2832 struct dentry *alias;
2833 d_drop(dentry);
2834 alias = d_exact_alias(dentry, state->inode);
2835 if (!alias)
2836 alias = d_splice_alias(igrab(state->inode), dentry);
2837 /* d_splice_alias() can't fail here - it's a non-directory */
2838 if (alias) {
2839 dput(ctx->dentry);
2840 ctx->dentry = dentry = alias;
2841 }
2842 nfs_set_verifier(dentry,
2843 nfs_save_change_attribute(d_inode(opendata->dir)));
2844 }
2845
2846 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2847 if (ret != 0)
2848 goto out;
2849
2850 if (d_inode(dentry) == state->inode) {
2851 nfs_inode_attach_open_context(ctx);
2852 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2853 nfs4_schedule_stateid_recovery(server, state);
2854 else
2855 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
2856 }
2857
2858 out:
2859 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
2860 return ret;
2861 }
2862
2863 /*
2864 * Returns a referenced nfs4_state
2865 */
2866 static int _nfs4_do_open(struct inode *dir,
2867 struct nfs_open_context *ctx,
2868 int flags,
2869 const struct nfs4_open_createattrs *c,
2870 int *opened)
2871 {
2872 struct nfs4_state_owner *sp;
2873 struct nfs4_state *state = NULL;
2874 struct nfs_server *server = NFS_SERVER(dir);
2875 struct nfs4_opendata *opendata;
2876 struct dentry *dentry = ctx->dentry;
2877 struct rpc_cred *cred = ctx->cred;
2878 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2879 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2880 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2881 struct iattr *sattr = c->sattr;
2882 struct nfs4_label *label = c->label;
2883 struct nfs4_label *olabel = NULL;
2884 int status;
2885
2886 /* Protect against reboot recovery conflicts */
2887 status = -ENOMEM;
2888 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2889 if (sp == NULL) {
2890 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2891 goto out_err;
2892 }
2893 status = nfs4_client_recover_expired_lease(server->nfs_client);
2894 if (status != 0)
2895 goto err_put_state_owner;
2896 if (d_really_is_positive(dentry))
2897 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2898 status = -ENOMEM;
2899 if (d_really_is_positive(dentry))
2900 claim = NFS4_OPEN_CLAIM_FH;
2901 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
2902 c, claim, GFP_KERNEL);
2903 if (opendata == NULL)
2904 goto err_put_state_owner;
2905
2906 if (label) {
2907 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2908 if (IS_ERR(olabel)) {
2909 status = PTR_ERR(olabel);
2910 goto err_opendata_put;
2911 }
2912 }
2913
2914 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2915 if (!opendata->f_attr.mdsthreshold) {
2916 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2917 if (!opendata->f_attr.mdsthreshold)
2918 goto err_free_label;
2919 }
2920 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2921 }
2922 if (d_really_is_positive(dentry))
2923 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2924
2925 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2926 if (status != 0)
2927 goto err_free_label;
2928 state = ctx->state;
2929
2930 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2931 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2932 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
2933 /*
2934 * send create attributes which was not set by open
2935 * with an extra setattr.
2936 */
2937 if (attrs || label) {
2938 unsigned ia_old = sattr->ia_valid;
2939
2940 sattr->ia_valid = attrs;
2941 nfs_fattr_init(opendata->o_res.f_attr);
2942 status = nfs4_do_setattr(state->inode, cred,
2943 opendata->o_res.f_attr, sattr,
2944 ctx, label, olabel);
2945 if (status == 0) {
2946 nfs_setattr_update_inode(state->inode, sattr,
2947 opendata->o_res.f_attr);
2948 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2949 }
2950 sattr->ia_valid = ia_old;
2951 }
2952 }
2953 if (opened && opendata->file_created)
2954 *opened |= FILE_CREATED;
2955
2956 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2957 *ctx_th = opendata->f_attr.mdsthreshold;
2958 opendata->f_attr.mdsthreshold = NULL;
2959 }
2960
2961 nfs4_label_free(olabel);
2962
2963 nfs4_opendata_put(opendata);
2964 nfs4_put_state_owner(sp);
2965 return 0;
2966 err_free_label:
2967 nfs4_label_free(olabel);
2968 err_opendata_put:
2969 nfs4_opendata_put(opendata);
2970 err_put_state_owner:
2971 nfs4_put_state_owner(sp);
2972 out_err:
2973 return status;
2974 }
2975
2976
2977 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2978 struct nfs_open_context *ctx,
2979 int flags,
2980 struct iattr *sattr,
2981 struct nfs4_label *label,
2982 int *opened)
2983 {
2984 struct nfs_server *server = NFS_SERVER(dir);
2985 struct nfs4_exception exception = { };
2986 struct nfs4_state *res;
2987 struct nfs4_open_createattrs c = {
2988 .label = label,
2989 .sattr = sattr,
2990 .verf = {
2991 [0] = (__u32)jiffies,
2992 [1] = (__u32)current->pid,
2993 },
2994 };
2995 int status;
2996
2997 do {
2998 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
2999 res = ctx->state;
3000 trace_nfs4_open_file(ctx, flags, status);
3001 if (status == 0)
3002 break;
3003 /* NOTE: BAD_SEQID means the server and client disagree about the
3004 * book-keeping w.r.t. state-changing operations
3005 * (OPEN/CLOSE/LOCK/LOCKU...)
3006 * It is actually a sign of a bug on the client or on the server.
3007 *
3008 * If we receive a BAD_SEQID error in the particular case of
3009 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3010 * have unhashed the old state_owner for us, and that we can
3011 * therefore safely retry using a new one. We should still warn
3012 * the user though...
3013 */
3014 if (status == -NFS4ERR_BAD_SEQID) {
3015 pr_warn_ratelimited("NFS: v4 server %s "
3016 " returned a bad sequence-id error!\n",
3017 NFS_SERVER(dir)->nfs_client->cl_hostname);
3018 exception.retry = 1;
3019 continue;
3020 }
3021 /*
3022 * BAD_STATEID on OPEN means that the server cancelled our
3023 * state before it received the OPEN_CONFIRM.
3024 * Recover by retrying the request as per the discussion
3025 * on Page 181 of RFC3530.
3026 */
3027 if (status == -NFS4ERR_BAD_STATEID) {
3028 exception.retry = 1;
3029 continue;
3030 }
3031 if (status == -EAGAIN) {
3032 /* We must have found a delegation */
3033 exception.retry = 1;
3034 continue;
3035 }
3036 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3037 continue;
3038 res = ERR_PTR(nfs4_handle_exception(server,
3039 status, &exception));
3040 } while (exception.retry);
3041 return res;
3042 }
3043
3044 static int _nfs4_do_setattr(struct inode *inode,
3045 struct nfs_setattrargs *arg,
3046 struct nfs_setattrres *res,
3047 struct rpc_cred *cred,
3048 struct nfs_open_context *ctx)
3049 {
3050 struct nfs_server *server = NFS_SERVER(inode);
3051 struct rpc_message msg = {
3052 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3053 .rpc_argp = arg,
3054 .rpc_resp = res,
3055 .rpc_cred = cred,
3056 };
3057 struct rpc_cred *delegation_cred = NULL;
3058 unsigned long timestamp = jiffies;
3059 bool truncate;
3060 int status;
3061
3062 nfs_fattr_init(res->fattr);
3063
3064 /* Servers should only apply open mode checks for file size changes */
3065 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3066 if (!truncate)
3067 goto zero_stateid;
3068
3069 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3070 /* Use that stateid */
3071 } else if (ctx != NULL) {
3072 struct nfs_lock_context *l_ctx;
3073 if (!nfs4_valid_open_stateid(ctx->state))
3074 return -EBADF;
3075 l_ctx = nfs_get_lock_context(ctx);
3076 if (IS_ERR(l_ctx))
3077 return PTR_ERR(l_ctx);
3078 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3079 &arg->stateid, &delegation_cred);
3080 nfs_put_lock_context(l_ctx);
3081 if (status == -EIO)
3082 return -EBADF;
3083 } else {
3084 zero_stateid:
3085 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3086 }
3087 if (delegation_cred)
3088 msg.rpc_cred = delegation_cred;
3089
3090 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3091
3092 put_rpccred(delegation_cred);
3093 if (status == 0 && ctx != NULL)
3094 renew_lease(server, timestamp);
3095 trace_nfs4_setattr(inode, &arg->stateid, status);
3096 return status;
3097 }
3098
3099 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
3100 struct nfs_fattr *fattr, struct iattr *sattr,
3101 struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3102 struct nfs4_label *olabel)
3103 {
3104 struct nfs_server *server = NFS_SERVER(inode);
3105 __u32 bitmask[NFS4_BITMASK_SZ];
3106 struct nfs4_state *state = ctx ? ctx->state : NULL;
3107 struct nfs_setattrargs arg = {
3108 .fh = NFS_FH(inode),
3109 .iap = sattr,
3110 .server = server,
3111 .bitmask = bitmask,
3112 .label = ilabel,
3113 };
3114 struct nfs_setattrres res = {
3115 .fattr = fattr,
3116 .label = olabel,
3117 .server = server,
3118 };
3119 struct nfs4_exception exception = {
3120 .state = state,
3121 .inode = inode,
3122 .stateid = &arg.stateid,
3123 };
3124 int err;
3125
3126 do {
3127 nfs4_bitmap_copy_adjust_setattr(bitmask,
3128 nfs4_bitmask(server, olabel),
3129 inode);
3130
3131 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3132 switch (err) {
3133 case -NFS4ERR_OPENMODE:
3134 if (!(sattr->ia_valid & ATTR_SIZE)) {
3135 pr_warn_once("NFSv4: server %s is incorrectly "
3136 "applying open mode checks to "
3137 "a SETATTR that is not "
3138 "changing file size.\n",
3139 server->nfs_client->cl_hostname);
3140 }
3141 if (state && !(state->state & FMODE_WRITE)) {
3142 err = -EBADF;
3143 if (sattr->ia_valid & ATTR_OPEN)
3144 err = -EACCES;
3145 goto out;
3146 }
3147 }
3148 err = nfs4_handle_exception(server, err, &exception);
3149 } while (exception.retry);
3150 out:
3151 return err;
3152 }
3153
3154 static bool
3155 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3156 {
3157 if (inode == NULL || !nfs_have_layout(inode))
3158 return false;
3159
3160 return pnfs_wait_on_layoutreturn(inode, task);
3161 }
3162
3163 struct nfs4_closedata {
3164 struct inode *inode;
3165 struct nfs4_state *state;
3166 struct nfs_closeargs arg;
3167 struct nfs_closeres res;
3168 struct {
3169 struct nfs4_layoutreturn_args arg;
3170 struct nfs4_layoutreturn_res res;
3171 struct nfs4_xdr_opaque_data ld_private;
3172 u32 roc_barrier;
3173 bool roc;
3174 } lr;
3175 struct nfs_fattr fattr;
3176 unsigned long timestamp;
3177 };
3178
3179 static void nfs4_free_closedata(void *data)
3180 {
3181 struct nfs4_closedata *calldata = data;
3182 struct nfs4_state_owner *sp = calldata->state->owner;
3183 struct super_block *sb = calldata->state->inode->i_sb;
3184
3185 if (calldata->lr.roc)
3186 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3187 calldata->res.lr_ret);
3188 nfs4_put_open_state(calldata->state);
3189 nfs_free_seqid(calldata->arg.seqid);
3190 nfs4_put_state_owner(sp);
3191 nfs_sb_deactive(sb);
3192 kfree(calldata);
3193 }
3194
3195 static void nfs4_close_done(struct rpc_task *task, void *data)
3196 {
3197 struct nfs4_closedata *calldata = data;
3198 struct nfs4_state *state = calldata->state;
3199 struct nfs_server *server = NFS_SERVER(calldata->inode);
3200 nfs4_stateid *res_stateid = NULL;
3201 struct nfs4_exception exception = {
3202 .state = state,
3203 .inode = calldata->inode,
3204 .stateid = &calldata->arg.stateid,
3205 };
3206
3207 dprintk("%s: begin!\n", __func__);
3208 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3209 return;
3210 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3211
3212 /* Handle Layoutreturn errors */
3213 if (calldata->arg.lr_args && task->tk_status != 0) {
3214 switch (calldata->res.lr_ret) {
3215 default:
3216 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3217 break;
3218 case 0:
3219 calldata->arg.lr_args = NULL;
3220 calldata->res.lr_res = NULL;
3221 break;
3222 case -NFS4ERR_OLD_STATEID:
3223 if (nfs4_refresh_layout_stateid(&calldata->arg.lr_args->stateid,
3224 calldata->inode))
3225 goto lr_restart;
3226 /* Fallthrough */
3227 case -NFS4ERR_ADMIN_REVOKED:
3228 case -NFS4ERR_DELEG_REVOKED:
3229 case -NFS4ERR_EXPIRED:
3230 case -NFS4ERR_BAD_STATEID:
3231 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
3232 case -NFS4ERR_WRONG_CRED:
3233 calldata->arg.lr_args = NULL;
3234 calldata->res.lr_res = NULL;
3235 goto lr_restart;
3236 }
3237 }
3238
3239 /* hmm. we are done with the inode, and in the process of freeing
3240 * the state_owner. we keep this around to process errors
3241 */
3242 switch (task->tk_status) {
3243 case 0:
3244 res_stateid = &calldata->res.stateid;
3245 renew_lease(server, calldata->timestamp);
3246 break;
3247 case -NFS4ERR_ACCESS:
3248 if (calldata->arg.bitmask != NULL) {
3249 calldata->arg.bitmask = NULL;
3250 calldata->res.fattr = NULL;
3251 goto out_restart;
3252
3253 }
3254 break;
3255 case -NFS4ERR_OLD_STATEID:
3256 /* Did we race with OPEN? */
3257 if (nfs4_refresh_open_stateid(&calldata->arg.stateid,
3258 state))
3259 goto out_restart;
3260 goto out_release;
3261 case -NFS4ERR_ADMIN_REVOKED:
3262 case -NFS4ERR_STALE_STATEID:
3263 case -NFS4ERR_EXPIRED:
3264 nfs4_free_revoked_stateid(server,
3265 &calldata->arg.stateid,
3266 task->tk_msg.rpc_cred);
3267 /* Fallthrough */
3268 case -NFS4ERR_BAD_STATEID:
3269 break;
3270 default:
3271 task->tk_status = nfs4_async_handle_exception(task,
3272 server, task->tk_status, &exception);
3273 if (exception.retry)
3274 goto out_restart;
3275 }
3276 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3277 res_stateid, calldata->arg.fmode);
3278 out_release:
3279 task->tk_status = 0;
3280 nfs_release_seqid(calldata->arg.seqid);
3281 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3282 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3283 return;
3284 lr_restart:
3285 calldata->res.lr_ret = 0;
3286 out_restart:
3287 task->tk_status = 0;
3288 rpc_restart_call_prepare(task);
3289 goto out_release;
3290 }
3291
3292 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3293 {
3294 struct nfs4_closedata *calldata = data;
3295 struct nfs4_state *state = calldata->state;
3296 struct inode *inode = calldata->inode;
3297 bool is_rdonly, is_wronly, is_rdwr;
3298 int call_close = 0;
3299
3300 dprintk("%s: begin!\n", __func__);
3301 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3302 goto out_wait;
3303
3304 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3305 spin_lock(&state->owner->so_lock);
3306 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3307 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3308 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3309 /* Calculate the change in open mode */
3310 calldata->arg.fmode = 0;
3311 if (state->n_rdwr == 0) {
3312 if (state->n_rdonly == 0)
3313 call_close |= is_rdonly;
3314 else if (is_rdonly)
3315 calldata->arg.fmode |= FMODE_READ;
3316 if (state->n_wronly == 0)
3317 call_close |= is_wronly;
3318 else if (is_wronly)
3319 calldata->arg.fmode |= FMODE_WRITE;
3320 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3321 call_close |= is_rdwr;
3322 } else if (is_rdwr)
3323 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3324
3325 if (!nfs4_valid_open_stateid(state) ||
3326 !nfs4_refresh_open_stateid(&calldata->arg.stateid, state))
3327 call_close = 0;
3328 spin_unlock(&state->owner->so_lock);
3329
3330 if (!call_close) {
3331 /* Note: exit _without_ calling nfs4_close_done */
3332 goto out_no_action;
3333 }
3334
3335 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3336 nfs_release_seqid(calldata->arg.seqid);
3337 goto out_wait;
3338 }
3339
3340 if (calldata->arg.fmode == 0)
3341 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3342
3343 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3344 /* Close-to-open cache consistency revalidation */
3345 if (!nfs4_have_delegation(inode, FMODE_READ))
3346 calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3347 else
3348 calldata->arg.bitmask = NULL;
3349 }
3350
3351 calldata->arg.share_access =
3352 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3353 calldata->arg.fmode, 0);
3354
3355 if (calldata->res.fattr == NULL)
3356 calldata->arg.bitmask = NULL;
3357 else if (calldata->arg.bitmask == NULL)
3358 calldata->res.fattr = NULL;
3359 calldata->timestamp = jiffies;
3360 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3361 &calldata->arg.seq_args,
3362 &calldata->res.seq_res,
3363 task) != 0)
3364 nfs_release_seqid(calldata->arg.seqid);
3365 dprintk("%s: done!\n", __func__);
3366 return;
3367 out_no_action:
3368 task->tk_action = NULL;
3369 out_wait:
3370 nfs4_sequence_done(task, &calldata->res.seq_res);
3371 }
3372
3373 static const struct rpc_call_ops nfs4_close_ops = {
3374 .rpc_call_prepare = nfs4_close_prepare,
3375 .rpc_call_done = nfs4_close_done,
3376 .rpc_release = nfs4_free_closedata,
3377 };
3378
3379 /*
3380 * It is possible for data to be read/written from a mem-mapped file
3381 * after the sys_close call (which hits the vfs layer as a flush).
3382 * This means that we can't safely call nfsv4 close on a file until
3383 * the inode is cleared. This in turn means that we are not good
3384 * NFSv4 citizens - we do not indicate to the server to update the file's
3385 * share state even when we are done with one of the three share
3386 * stateid's in the inode.
3387 *
3388 * NOTE: Caller must be holding the sp->so_owner semaphore!
3389 */
3390 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3391 {
3392 struct nfs_server *server = NFS_SERVER(state->inode);
3393 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3394 struct nfs4_closedata *calldata;
3395 struct nfs4_state_owner *sp = state->owner;
3396 struct rpc_task *task;
3397 struct rpc_message msg = {
3398 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3399 .rpc_cred = state->owner->so_cred,
3400 };
3401 struct rpc_task_setup task_setup_data = {
3402 .rpc_client = server->client,
3403 .rpc_message = &msg,
3404 .callback_ops = &nfs4_close_ops,
3405 .workqueue = nfsiod_workqueue,
3406 .flags = RPC_TASK_ASYNC,
3407 };
3408 int status = -ENOMEM;
3409
3410 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3411 &task_setup_data.rpc_client, &msg);
3412
3413 calldata = kzalloc(sizeof(*calldata), gfp_mask);
3414 if (calldata == NULL)
3415 goto out;
3416 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3417 calldata->inode = state->inode;
3418 calldata->state = state;
3419 calldata->arg.fh = NFS_FH(state->inode);
3420 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3421 goto out_free_calldata;
3422 /* Serialization for the sequence id */
3423 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3424 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3425 if (IS_ERR(calldata->arg.seqid))
3426 goto out_free_calldata;
3427 nfs_fattr_init(&calldata->fattr);
3428 calldata->arg.fmode = 0;
3429 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3430 calldata->res.fattr = &calldata->fattr;
3431 calldata->res.seqid = calldata->arg.seqid;
3432 calldata->res.server = server;
3433 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3434 calldata->lr.roc = pnfs_roc(state->inode,
3435 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3436 if (calldata->lr.roc) {
3437 calldata->arg.lr_args = &calldata->lr.arg;
3438 calldata->res.lr_res = &calldata->lr.res;
3439 }
3440 nfs_sb_active(calldata->inode->i_sb);
3441
3442 msg.rpc_argp = &calldata->arg;
3443 msg.rpc_resp = &calldata->res;
3444 task_setup_data.callback_data = calldata;
3445 task = rpc_run_task(&task_setup_data);
3446 if (IS_ERR(task))
3447 return PTR_ERR(task);
3448 status = 0;
3449 if (wait)
3450 status = rpc_wait_for_completion_task(task);
3451 rpc_put_task(task);
3452 return status;
3453 out_free_calldata:
3454 kfree(calldata);
3455 out:
3456 nfs4_put_open_state(state);
3457 nfs4_put_state_owner(sp);
3458 return status;
3459 }
3460
3461 static struct inode *
3462 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3463 int open_flags, struct iattr *attr, int *opened)
3464 {
3465 struct nfs4_state *state;
3466 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3467
3468 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3469
3470 /* Protect against concurrent sillydeletes */
3471 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3472
3473 nfs4_label_release_security(label);
3474
3475 if (IS_ERR(state))
3476 return ERR_CAST(state);
3477 return state->inode;
3478 }
3479
3480 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3481 {
3482 if (ctx->state == NULL)
3483 return;
3484 if (is_sync)
3485 nfs4_close_sync(ctx->state, ctx->mode);
3486 else
3487 nfs4_close_state(ctx->state, ctx->mode);
3488 }
3489
3490 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3491 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3492 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL)
3493
3494 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3495 {
3496 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3497 struct nfs4_server_caps_arg args = {
3498 .fhandle = fhandle,
3499 .bitmask = bitmask,
3500 };
3501 struct nfs4_server_caps_res res = {};
3502 struct rpc_message msg = {
3503 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3504 .rpc_argp = &args,
3505 .rpc_resp = &res,
3506 };
3507 int status;
3508 int i;
3509
3510 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3511 FATTR4_WORD0_FH_EXPIRE_TYPE |
3512 FATTR4_WORD0_LINK_SUPPORT |
3513 FATTR4_WORD0_SYMLINK_SUPPORT |
3514 FATTR4_WORD0_ACLSUPPORT;
3515 if (minorversion)
3516 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3517
3518 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3519 if (status == 0) {
3520 /* Sanity check the server answers */
3521 switch (minorversion) {
3522 case 0:
3523 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3524 res.attr_bitmask[2] = 0;
3525 break;
3526 case 1:
3527 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3528 break;
3529 case 2:
3530 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3531 }
3532 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3533 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3534 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3535 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3536 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3537 NFS_CAP_CTIME|NFS_CAP_MTIME|
3538 NFS_CAP_SECURITY_LABEL);
3539 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3540 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3541 server->caps |= NFS_CAP_ACLS;
3542 if (res.has_links != 0)
3543 server->caps |= NFS_CAP_HARDLINKS;
3544 if (res.has_symlinks != 0)
3545 server->caps |= NFS_CAP_SYMLINKS;
3546 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3547 server->caps |= NFS_CAP_FILEID;
3548 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3549 server->caps |= NFS_CAP_MODE;
3550 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3551 server->caps |= NFS_CAP_NLINK;
3552 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3553 server->caps |= NFS_CAP_OWNER;
3554 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3555 server->caps |= NFS_CAP_OWNER_GROUP;
3556 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3557 server->caps |= NFS_CAP_ATIME;
3558 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3559 server->caps |= NFS_CAP_CTIME;
3560 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3561 server->caps |= NFS_CAP_MTIME;
3562 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3563 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3564 server->caps |= NFS_CAP_SECURITY_LABEL;
3565 #endif
3566 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3567 sizeof(server->attr_bitmask));
3568 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3569
3570 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3571 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3572 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3573 server->cache_consistency_bitmask[2] = 0;
3574
3575 /* Avoid a regression due to buggy server */
3576 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3577 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3578 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3579 sizeof(server->exclcreat_bitmask));
3580
3581 server->acl_bitmask = res.acl_bitmask;
3582 server->fh_expire_type = res.fh_expire_type;
3583 }
3584
3585 return status;
3586 }
3587
3588 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3589 {
3590 struct nfs4_exception exception = { };
3591 int err;
3592 do {
3593 err = nfs4_handle_exception(server,
3594 _nfs4_server_capabilities(server, fhandle),
3595 &exception);
3596 } while (exception.retry);
3597 return err;
3598 }
3599
3600 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3601 struct nfs_fsinfo *info)
3602 {
3603 u32 bitmask[3];
3604 struct nfs4_lookup_root_arg args = {
3605 .bitmask = bitmask,
3606 };
3607 struct nfs4_lookup_res res = {
3608 .server = server,
3609 .fattr = info->fattr,
3610 .fh = fhandle,
3611 };
3612 struct rpc_message msg = {
3613 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3614 .rpc_argp = &args,
3615 .rpc_resp = &res,
3616 };
3617
3618 bitmask[0] = nfs4_fattr_bitmap[0];
3619 bitmask[1] = nfs4_fattr_bitmap[1];
3620 /*
3621 * Process the label in the upcoming getfattr
3622 */
3623 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3624
3625 nfs_fattr_init(info->fattr);
3626 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3627 }
3628
3629 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3630 struct nfs_fsinfo *info)
3631 {
3632 struct nfs4_exception exception = { };
3633 int err;
3634 do {
3635 err = _nfs4_lookup_root(server, fhandle, info);
3636 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3637 switch (err) {
3638 case 0:
3639 case -NFS4ERR_WRONGSEC:
3640 goto out;
3641 default:
3642 err = nfs4_handle_exception(server, err, &exception);
3643 }
3644 } while (exception.retry);
3645 out:
3646 return err;
3647 }
3648
3649 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3650 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3651 {
3652 struct rpc_auth_create_args auth_args = {
3653 .pseudoflavor = flavor,
3654 };
3655 struct rpc_auth *auth;
3656
3657 auth = rpcauth_create(&auth_args, server->client);
3658 if (IS_ERR(auth))
3659 return -EACCES;
3660 return nfs4_lookup_root(server, fhandle, info);
3661 }
3662
3663 /*
3664 * Retry pseudoroot lookup with various security flavors. We do this when:
3665 *
3666 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3667 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3668 *
3669 * Returns zero on success, or a negative NFS4ERR value, or a
3670 * negative errno value.
3671 */
3672 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3673 struct nfs_fsinfo *info)
3674 {
3675 /* Per 3530bis 15.33.5 */
3676 static const rpc_authflavor_t flav_array[] = {
3677 RPC_AUTH_GSS_KRB5P,
3678 RPC_AUTH_GSS_KRB5I,
3679 RPC_AUTH_GSS_KRB5,
3680 RPC_AUTH_UNIX, /* courtesy */
3681 RPC_AUTH_NULL,
3682 };
3683 int status = -EPERM;
3684 size_t i;
3685
3686 if (server->auth_info.flavor_len > 0) {
3687 /* try each flavor specified by user */
3688 for (i = 0; i < server->auth_info.flavor_len; i++) {
3689 status = nfs4_lookup_root_sec(server, fhandle, info,
3690 server->auth_info.flavors[i]);
3691 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3692 continue;
3693 break;
3694 }
3695 } else {
3696 /* no flavors specified by user, try default list */
3697 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3698 status = nfs4_lookup_root_sec(server, fhandle, info,
3699 flav_array[i]);
3700 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3701 continue;
3702 break;
3703 }
3704 }
3705
3706 /*
3707 * -EACCESS could mean that the user doesn't have correct permissions
3708 * to access the mount. It could also mean that we tried to mount
3709 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
3710 * existing mount programs don't handle -EACCES very well so it should
3711 * be mapped to -EPERM instead.
3712 */
3713 if (status == -EACCES)
3714 status = -EPERM;
3715 return status;
3716 }
3717
3718 /**
3719 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3720 * @server: initialized nfs_server handle
3721 * @fhandle: we fill in the pseudo-fs root file handle
3722 * @info: we fill in an FSINFO struct
3723 * @auth_probe: probe the auth flavours
3724 *
3725 * Returns zero on success, or a negative errno.
3726 */
3727 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3728 struct nfs_fsinfo *info,
3729 bool auth_probe)
3730 {
3731 int status = 0;
3732
3733 if (!auth_probe)
3734 status = nfs4_lookup_root(server, fhandle, info);
3735
3736 if (auth_probe || status == NFS4ERR_WRONGSEC)
3737 status = server->nfs_client->cl_mvops->find_root_sec(server,
3738 fhandle, info);
3739
3740 if (status == 0)
3741 status = nfs4_server_capabilities(server, fhandle);
3742 if (status == 0)
3743 status = nfs4_do_fsinfo(server, fhandle, info);
3744
3745 return nfs4_map_errors(status);
3746 }
3747
3748 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3749 struct nfs_fsinfo *info)
3750 {
3751 int error;
3752 struct nfs_fattr *fattr = info->fattr;
3753 struct nfs4_label *label = NULL;
3754
3755 error = nfs4_server_capabilities(server, mntfh);
3756 if (error < 0) {
3757 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3758 return error;
3759 }
3760
3761 label = nfs4_label_alloc(server, GFP_KERNEL);
3762 if (IS_ERR(label))
3763 return PTR_ERR(label);
3764
3765 error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL);
3766 if (error < 0) {
3767 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3768 goto err_free_label;
3769 }
3770
3771 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3772 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3773 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3774
3775 err_free_label:
3776 nfs4_label_free(label);
3777
3778 return error;
3779 }
3780
3781 /*
3782 * Get locations and (maybe) other attributes of a referral.
3783 * Note that we'll actually follow the referral later when
3784 * we detect fsid mismatch in inode revalidation
3785 */
3786 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3787 const struct qstr *name, struct nfs_fattr *fattr,
3788 struct nfs_fh *fhandle)
3789 {
3790 int status = -ENOMEM;
3791 struct page *page = NULL;
3792 struct nfs4_fs_locations *locations = NULL;
3793
3794 page = alloc_page(GFP_KERNEL);
3795 if (page == NULL)
3796 goto out;
3797 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3798 if (locations == NULL)
3799 goto out;
3800
3801 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3802 if (status != 0)
3803 goto out;
3804
3805 /*
3806 * If the fsid didn't change, this is a migration event, not a
3807 * referral. Cause us to drop into the exception handler, which
3808 * will kick off migration recovery.
3809 */
3810 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3811 dprintk("%s: server did not return a different fsid for"
3812 " a referral at %s\n", __func__, name->name);
3813 status = -NFS4ERR_MOVED;
3814 goto out;
3815 }
3816 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3817 nfs_fixup_referral_attributes(&locations->fattr);
3818
3819 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3820 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3821 memset(fhandle, 0, sizeof(struct nfs_fh));
3822 out:
3823 if (page)
3824 __free_page(page);
3825 kfree(locations);
3826 return status;
3827 }
3828
3829 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3830 struct nfs_fattr *fattr, struct nfs4_label *label,
3831 struct inode *inode)
3832 {
3833 __u32 bitmask[NFS4_BITMASK_SZ];
3834 struct nfs4_getattr_arg args = {
3835 .fh = fhandle,
3836 .bitmask = bitmask,
3837 };
3838 struct nfs4_getattr_res res = {
3839 .fattr = fattr,
3840 .label = label,
3841 .server = server,
3842 };
3843 struct rpc_message msg = {
3844 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3845 .rpc_argp = &args,
3846 .rpc_resp = &res,
3847 };
3848
3849 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
3850
3851 nfs_fattr_init(fattr);
3852 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3853 }
3854
3855 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3856 struct nfs_fattr *fattr, struct nfs4_label *label,
3857 struct inode *inode)
3858 {
3859 struct nfs4_exception exception = { };
3860 int err;
3861 do {
3862 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode);
3863 trace_nfs4_getattr(server, fhandle, fattr, err);
3864 err = nfs4_handle_exception(server, err,
3865 &exception);
3866 } while (exception.retry);
3867 return err;
3868 }
3869
3870 /*
3871 * The file is not closed if it is opened due to the a request to change
3872 * the size of the file. The open call will not be needed once the
3873 * VFS layer lookup-intents are implemented.
3874 *
3875 * Close is called when the inode is destroyed.
3876 * If we haven't opened the file for O_WRONLY, we
3877 * need to in the size_change case to obtain a stateid.
3878 *
3879 * Got race?
3880 * Because OPEN is always done by name in nfsv4, it is
3881 * possible that we opened a different file by the same
3882 * name. We can recognize this race condition, but we
3883 * can't do anything about it besides returning an error.
3884 *
3885 * This will be fixed with VFS changes (lookup-intent).
3886 */
3887 static int
3888 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3889 struct iattr *sattr)
3890 {
3891 struct inode *inode = d_inode(dentry);
3892 struct rpc_cred *cred = NULL;
3893 struct nfs_open_context *ctx = NULL;
3894 struct nfs4_label *label = NULL;
3895 int status;
3896
3897 if (pnfs_ld_layoutret_on_setattr(inode) &&
3898 sattr->ia_valid & ATTR_SIZE &&
3899 sattr->ia_size < i_size_read(inode))
3900 pnfs_commit_and_return_layout(inode);
3901
3902 nfs_fattr_init(fattr);
3903
3904 /* Deal with open(O_TRUNC) */
3905 if (sattr->ia_valid & ATTR_OPEN)
3906 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3907
3908 /* Optimization: if the end result is no change, don't RPC */
3909 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3910 return 0;
3911
3912 /* Search for an existing open(O_WRITE) file */
3913 if (sattr->ia_valid & ATTR_FILE) {
3914
3915 ctx = nfs_file_open_context(sattr->ia_file);
3916 if (ctx)
3917 cred = ctx->cred;
3918 }
3919
3920 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3921 if (IS_ERR(label))
3922 return PTR_ERR(label);
3923
3924 /* Return any delegations if we're going to change ACLs */
3925 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
3926 nfs4_inode_make_writeable(inode);
3927
3928 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
3929 if (status == 0) {
3930 nfs_setattr_update_inode(inode, sattr, fattr);
3931 nfs_setsecurity(inode, fattr, label);
3932 }
3933 nfs4_label_free(label);
3934 return status;
3935 }
3936
3937 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3938 const struct qstr *name, struct nfs_fh *fhandle,
3939 struct nfs_fattr *fattr, struct nfs4_label *label)
3940 {
3941 struct nfs_server *server = NFS_SERVER(dir);
3942 int status;
3943 struct nfs4_lookup_arg args = {
3944 .bitmask = server->attr_bitmask,
3945 .dir_fh = NFS_FH(dir),
3946 .name = name,
3947 };
3948 struct nfs4_lookup_res res = {
3949 .server = server,
3950 .fattr = fattr,
3951 .label = label,
3952 .fh = fhandle,
3953 };
3954 struct rpc_message msg = {
3955 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3956 .rpc_argp = &args,
3957 .rpc_resp = &res,
3958 };
3959
3960 args.bitmask = nfs4_bitmask(server, label);
3961
3962 nfs_fattr_init(fattr);
3963
3964 dprintk("NFS call lookup %s\n", name->name);
3965 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3966 dprintk("NFS reply lookup: %d\n", status);
3967 return status;
3968 }
3969
3970 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3971 {
3972 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3973 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3974 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3975 fattr->nlink = 2;
3976 }
3977
3978 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3979 const struct qstr *name, struct nfs_fh *fhandle,
3980 struct nfs_fattr *fattr, struct nfs4_label *label)
3981 {
3982 struct nfs4_exception exception = { };
3983 struct rpc_clnt *client = *clnt;
3984 int err;
3985 do {
3986 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3987 trace_nfs4_lookup(dir, name, err);
3988 switch (err) {
3989 case -NFS4ERR_BADNAME:
3990 err = -ENOENT;
3991 goto out;
3992 case -NFS4ERR_MOVED:
3993 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3994 if (err == -NFS4ERR_MOVED)
3995 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3996 goto out;
3997 case -NFS4ERR_WRONGSEC:
3998 err = -EPERM;
3999 if (client != *clnt)
4000 goto out;
4001 client = nfs4_negotiate_security(client, dir, name);
4002 if (IS_ERR(client))
4003 return PTR_ERR(client);
4004
4005 exception.retry = 1;
4006 break;
4007 default:
4008 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4009 }
4010 } while (exception.retry);
4011
4012 out:
4013 if (err == 0)
4014 *clnt = client;
4015 else if (client != *clnt)
4016 rpc_shutdown_client(client);
4017
4018 return err;
4019 }
4020
4021 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
4022 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4023 struct nfs4_label *label)
4024 {
4025 int status;
4026 struct rpc_clnt *client = NFS_CLIENT(dir);
4027
4028 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
4029 if (client != NFS_CLIENT(dir)) {
4030 rpc_shutdown_client(client);
4031 nfs_fixup_secinfo_attributes(fattr);
4032 }
4033 return status;
4034 }
4035
4036 struct rpc_clnt *
4037 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name,
4038 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4039 {
4040 struct rpc_clnt *client = NFS_CLIENT(dir);
4041 int status;
4042
4043 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
4044 if (status < 0)
4045 return ERR_PTR(status);
4046 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4047 }
4048
4049 static int _nfs4_proc_lookupp(struct inode *inode,
4050 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4051 struct nfs4_label *label)
4052 {
4053 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4054 struct nfs_server *server = NFS_SERVER(inode);
4055 int status;
4056 struct nfs4_lookupp_arg args = {
4057 .bitmask = server->attr_bitmask,
4058 .fh = NFS_FH(inode),
4059 };
4060 struct nfs4_lookupp_res res = {
4061 .server = server,
4062 .fattr = fattr,
4063 .label = label,
4064 .fh = fhandle,
4065 };
4066 struct rpc_message msg = {
4067 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4068 .rpc_argp = &args,
4069 .rpc_resp = &res,
4070 };
4071
4072 args.bitmask = nfs4_bitmask(server, label);
4073
4074 nfs_fattr_init(fattr);
4075
4076 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino);
4077 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4078 &res.seq_res, 0);
4079 dprintk("NFS reply lookupp: %d\n", status);
4080 return status;
4081 }
4082
4083 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4084 struct nfs_fattr *fattr, struct nfs4_label *label)
4085 {
4086 struct nfs4_exception exception = { };
4087 int err;
4088 do {
4089 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4090 trace_nfs4_lookupp(inode, err);
4091 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4092 &exception);
4093 } while (exception.retry);
4094 return err;
4095 }
4096
4097 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4098 {
4099 struct nfs_server *server = NFS_SERVER(inode);
4100 struct nfs4_accessargs args = {
4101 .fh = NFS_FH(inode),
4102 .access = entry->mask,
4103 };
4104 struct nfs4_accessres res = {
4105 .server = server,
4106 };
4107 struct rpc_message msg = {
4108 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4109 .rpc_argp = &args,
4110 .rpc_resp = &res,
4111 .rpc_cred = entry->cred,
4112 };
4113 int status = 0;
4114
4115 if (!nfs4_have_delegation(inode, FMODE_READ)) {
4116 res.fattr = nfs_alloc_fattr();
4117 if (res.fattr == NULL)
4118 return -ENOMEM;
4119 args.bitmask = server->cache_consistency_bitmask;
4120 }
4121
4122 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4123 if (!status) {
4124 nfs_access_set_mask(entry, res.access);
4125 if (res.fattr)
4126 nfs_refresh_inode(inode, res.fattr);
4127 }
4128 nfs_free_fattr(res.fattr);
4129 return status;
4130 }
4131
4132 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4133 {
4134 struct nfs4_exception exception = { };
4135 int err;
4136 do {
4137 err = _nfs4_proc_access(inode, entry);
4138 trace_nfs4_access(inode, err);
4139 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4140 &exception);
4141 } while (exception.retry);
4142 return err;
4143 }
4144
4145 /*
4146 * TODO: For the time being, we don't try to get any attributes
4147 * along with any of the zero-copy operations READ, READDIR,
4148 * READLINK, WRITE.
4149 *
4150 * In the case of the first three, we want to put the GETATTR
4151 * after the read-type operation -- this is because it is hard
4152 * to predict the length of a GETATTR response in v4, and thus
4153 * align the READ data correctly. This means that the GETATTR
4154 * may end up partially falling into the page cache, and we should
4155 * shift it into the 'tail' of the xdr_buf before processing.
4156 * To do this efficiently, we need to know the total length
4157 * of data received, which doesn't seem to be available outside
4158 * of the RPC layer.
4159 *
4160 * In the case of WRITE, we also want to put the GETATTR after
4161 * the operation -- in this case because we want to make sure
4162 * we get the post-operation mtime and size.
4163 *
4164 * Both of these changes to the XDR layer would in fact be quite
4165 * minor, but I decided to leave them for a subsequent patch.
4166 */
4167 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4168 unsigned int pgbase, unsigned int pglen)
4169 {
4170 struct nfs4_readlink args = {
4171 .fh = NFS_FH(inode),
4172 .pgbase = pgbase,
4173 .pglen = pglen,
4174 .pages = &page,
4175 };
4176 struct nfs4_readlink_res res;
4177 struct rpc_message msg = {
4178 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4179 .rpc_argp = &args,
4180 .rpc_resp = &res,
4181 };
4182
4183 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4184 }
4185
4186 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4187 unsigned int pgbase, unsigned int pglen)
4188 {
4189 struct nfs4_exception exception = { };
4190 int err;
4191 do {
4192 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4193 trace_nfs4_readlink(inode, err);
4194 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4195 &exception);
4196 } while (exception.retry);
4197 return err;
4198 }
4199
4200 /*
4201 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4202 */
4203 static int
4204 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4205 int flags)
4206 {
4207 struct nfs_server *server = NFS_SERVER(dir);
4208 struct nfs4_label l, *ilabel = NULL;
4209 struct nfs_open_context *ctx;
4210 struct nfs4_state *state;
4211 int status = 0;
4212
4213 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4214 if (IS_ERR(ctx))
4215 return PTR_ERR(ctx);
4216
4217 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4218
4219 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4220 sattr->ia_mode &= ~current_umask();
4221 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4222 if (IS_ERR(state)) {
4223 status = PTR_ERR(state);
4224 goto out;
4225 }
4226 out:
4227 nfs4_label_release_security(ilabel);
4228 put_nfs_open_context(ctx);
4229 return status;
4230 }
4231
4232 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name)
4233 {
4234 struct nfs_server *server = NFS_SERVER(dir);
4235 struct nfs_removeargs args = {
4236 .fh = NFS_FH(dir),
4237 .name = *name,
4238 };
4239 struct nfs_removeres res = {
4240 .server = server,
4241 };
4242 struct rpc_message msg = {
4243 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4244 .rpc_argp = &args,
4245 .rpc_resp = &res,
4246 };
4247 unsigned long timestamp = jiffies;
4248 int status;
4249
4250 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4251 if (status == 0)
4252 update_changeattr(dir, &res.cinfo, timestamp);
4253 return status;
4254 }
4255
4256 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4257 {
4258 struct nfs4_exception exception = { };
4259 struct inode *inode = d_inode(dentry);
4260 int err;
4261
4262 if (inode) {
4263 if (inode->i_nlink == 1)
4264 nfs4_inode_return_delegation(inode);
4265 else
4266 nfs4_inode_make_writeable(inode);
4267 }
4268 do {
4269 err = _nfs4_proc_remove(dir, &dentry->d_name);
4270 trace_nfs4_remove(dir, &dentry->d_name, err);
4271 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4272 &exception);
4273 } while (exception.retry);
4274 return err;
4275 }
4276
4277 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4278 {
4279 struct nfs4_exception exception = { };
4280 int err;
4281
4282 do {
4283 err = _nfs4_proc_remove(dir, name);
4284 trace_nfs4_remove(dir, name, err);
4285 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4286 &exception);
4287 } while (exception.retry);
4288 return err;
4289 }
4290
4291 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4292 struct dentry *dentry,
4293 struct inode *inode)
4294 {
4295 struct nfs_removeargs *args = msg->rpc_argp;
4296 struct nfs_removeres *res = msg->rpc_resp;
4297
4298 res->server = NFS_SB(dentry->d_sb);
4299 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4300 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4301
4302 nfs_fattr_init(res->dir_attr);
4303
4304 if (inode)
4305 nfs4_inode_return_delegation(inode);
4306 }
4307
4308 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4309 {
4310 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4311 &data->args.seq_args,
4312 &data->res.seq_res,
4313 task);
4314 }
4315
4316 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4317 {
4318 struct nfs_unlinkdata *data = task->tk_calldata;
4319 struct nfs_removeres *res = &data->res;
4320
4321 if (!nfs4_sequence_done(task, &res->seq_res))
4322 return 0;
4323 if (nfs4_async_handle_error(task, res->server, NULL,
4324 &data->timeout) == -EAGAIN)
4325 return 0;
4326 if (task->tk_status == 0)
4327 update_changeattr(dir, &res->cinfo, res->dir_attr->time_start);
4328 return 1;
4329 }
4330
4331 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4332 struct dentry *old_dentry,
4333 struct dentry *new_dentry)
4334 {
4335 struct nfs_renameargs *arg = msg->rpc_argp;
4336 struct nfs_renameres *res = msg->rpc_resp;
4337 struct inode *old_inode = d_inode(old_dentry);
4338 struct inode *new_inode = d_inode(new_dentry);
4339
4340 if (old_inode)
4341 nfs4_inode_make_writeable(old_inode);
4342 if (new_inode)
4343 nfs4_inode_return_delegation(new_inode);
4344 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4345 res->server = NFS_SB(old_dentry->d_sb);
4346 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4347 }
4348
4349 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4350 {
4351 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4352 &data->args.seq_args,
4353 &data->res.seq_res,
4354 task);
4355 }
4356
4357 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4358 struct inode *new_dir)
4359 {
4360 struct nfs_renamedata *data = task->tk_calldata;
4361 struct nfs_renameres *res = &data->res;
4362
4363 if (!nfs4_sequence_done(task, &res->seq_res))
4364 return 0;
4365 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4366 return 0;
4367
4368 if (task->tk_status == 0) {
4369 update_changeattr(old_dir, &res->old_cinfo, res->old_fattr->time_start);
4370 if (new_dir != old_dir)
4371 update_changeattr(new_dir, &res->new_cinfo, res->new_fattr->time_start);
4372 }
4373 return 1;
4374 }
4375
4376 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4377 {
4378 struct nfs_server *server = NFS_SERVER(inode);
4379 __u32 bitmask[NFS4_BITMASK_SZ];
4380 struct nfs4_link_arg arg = {
4381 .fh = NFS_FH(inode),
4382 .dir_fh = NFS_FH(dir),
4383 .name = name,
4384 .bitmask = bitmask,
4385 };
4386 struct nfs4_link_res res = {
4387 .server = server,
4388 .label = NULL,
4389 };
4390 struct rpc_message msg = {
4391 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4392 .rpc_argp = &arg,
4393 .rpc_resp = &res,
4394 };
4395 int status = -ENOMEM;
4396
4397 res.fattr = nfs_alloc_fattr();
4398 if (res.fattr == NULL)
4399 goto out;
4400
4401 res.label = nfs4_label_alloc(server, GFP_KERNEL);
4402 if (IS_ERR(res.label)) {
4403 status = PTR_ERR(res.label);
4404 goto out;
4405 }
4406
4407 nfs4_inode_make_writeable(inode);
4408 nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode);
4409
4410 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4411 if (!status) {
4412 update_changeattr(dir, &res.cinfo, res.fattr->time_start);
4413 status = nfs_post_op_update_inode(inode, res.fattr);
4414 if (!status)
4415 nfs_setsecurity(inode, res.fattr, res.label);
4416 }
4417
4418
4419 nfs4_label_free(res.label);
4420
4421 out:
4422 nfs_free_fattr(res.fattr);
4423 return status;
4424 }
4425
4426 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4427 {
4428 struct nfs4_exception exception = { };
4429 int err;
4430 do {
4431 err = nfs4_handle_exception(NFS_SERVER(inode),
4432 _nfs4_proc_link(inode, dir, name),
4433 &exception);
4434 } while (exception.retry);
4435 return err;
4436 }
4437
4438 struct nfs4_createdata {
4439 struct rpc_message msg;
4440 struct nfs4_create_arg arg;
4441 struct nfs4_create_res res;
4442 struct nfs_fh fh;
4443 struct nfs_fattr fattr;
4444 struct nfs4_label *label;
4445 };
4446
4447 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4448 const struct qstr *name, struct iattr *sattr, u32 ftype)
4449 {
4450 struct nfs4_createdata *data;
4451
4452 data = kzalloc(sizeof(*data), GFP_KERNEL);
4453 if (data != NULL) {
4454 struct nfs_server *server = NFS_SERVER(dir);
4455
4456 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4457 if (IS_ERR(data->label))
4458 goto out_free;
4459
4460 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4461 data->msg.rpc_argp = &data->arg;
4462 data->msg.rpc_resp = &data->res;
4463 data->arg.dir_fh = NFS_FH(dir);
4464 data->arg.server = server;
4465 data->arg.name = name;
4466 data->arg.attrs = sattr;
4467 data->arg.ftype = ftype;
4468 data->arg.bitmask = nfs4_bitmask(server, data->label);
4469 data->arg.umask = current_umask();
4470 data->res.server = server;
4471 data->res.fh = &data->fh;
4472 data->res.fattr = &data->fattr;
4473 data->res.label = data->label;
4474 nfs_fattr_init(data->res.fattr);
4475 }
4476 return data;
4477 out_free:
4478 kfree(data);
4479 return NULL;
4480 }
4481
4482 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4483 {
4484 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4485 &data->arg.seq_args, &data->res.seq_res, 1);
4486 if (status == 0) {
4487 update_changeattr(dir, &data->res.dir_cinfo,
4488 data->res.fattr->time_start);
4489 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4490 }
4491 return status;
4492 }
4493
4494 static void nfs4_free_createdata(struct nfs4_createdata *data)
4495 {
4496 nfs4_label_free(data->label);
4497 kfree(data);
4498 }
4499
4500 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4501 struct page *page, unsigned int len, struct iattr *sattr,
4502 struct nfs4_label *label)
4503 {
4504 struct nfs4_createdata *data;
4505 int status = -ENAMETOOLONG;
4506
4507 if (len > NFS4_MAXPATHLEN)
4508 goto out;
4509
4510 status = -ENOMEM;
4511 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4512 if (data == NULL)
4513 goto out;
4514
4515 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4516 data->arg.u.symlink.pages = &page;
4517 data->arg.u.symlink.len = len;
4518 data->arg.label = label;
4519
4520 status = nfs4_do_create(dir, dentry, data);
4521
4522 nfs4_free_createdata(data);
4523 out:
4524 return status;
4525 }
4526
4527 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4528 struct page *page, unsigned int len, struct iattr *sattr)
4529 {
4530 struct nfs4_exception exception = { };
4531 struct nfs4_label l, *label = NULL;
4532 int err;
4533
4534 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4535
4536 do {
4537 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4538 trace_nfs4_symlink(dir, &dentry->d_name, err);
4539 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4540 &exception);
4541 } while (exception.retry);
4542
4543 nfs4_label_release_security(label);
4544 return err;
4545 }
4546
4547 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4548 struct iattr *sattr, struct nfs4_label *label)
4549 {
4550 struct nfs4_createdata *data;
4551 int status = -ENOMEM;
4552
4553 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4554 if (data == NULL)
4555 goto out;
4556
4557 data->arg.label = label;
4558 status = nfs4_do_create(dir, dentry, data);
4559
4560 nfs4_free_createdata(data);
4561 out:
4562 return status;
4563 }
4564
4565 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4566 struct iattr *sattr)
4567 {
4568 struct nfs_server *server = NFS_SERVER(dir);
4569 struct nfs4_exception exception = { };
4570 struct nfs4_label l, *label = NULL;
4571 int err;
4572
4573 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4574
4575 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4576 sattr->ia_mode &= ~current_umask();
4577 do {
4578 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4579 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4580 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4581 &exception);
4582 } while (exception.retry);
4583 nfs4_label_release_security(label);
4584
4585 return err;
4586 }
4587
4588 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4589 u64 cookie, struct page **pages, unsigned int count, bool plus)
4590 {
4591 struct inode *dir = d_inode(dentry);
4592 struct nfs4_readdir_arg args = {
4593 .fh = NFS_FH(dir),
4594 .pages = pages,
4595 .pgbase = 0,
4596 .count = count,
4597 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4598 .plus = plus,
4599 };
4600 struct nfs4_readdir_res res;
4601 struct rpc_message msg = {
4602 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4603 .rpc_argp = &args,
4604 .rpc_resp = &res,
4605 .rpc_cred = cred,
4606 };
4607 int status;
4608
4609 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4610 dentry,
4611 (unsigned long long)cookie);
4612 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4613 res.pgbase = args.pgbase;
4614 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4615 if (status >= 0) {
4616 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4617 status += args.pgbase;
4618 }
4619
4620 nfs_invalidate_atime(dir);
4621
4622 dprintk("%s: returns %d\n", __func__, status);
4623 return status;
4624 }
4625
4626 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4627 u64 cookie, struct page **pages, unsigned int count, bool plus)
4628 {
4629 struct nfs4_exception exception = { };
4630 int err;
4631 do {
4632 err = _nfs4_proc_readdir(dentry, cred, cookie,
4633 pages, count, plus);
4634 trace_nfs4_readdir(d_inode(dentry), err);
4635 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4636 &exception);
4637 } while (exception.retry);
4638 return err;
4639 }
4640
4641 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4642 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4643 {
4644 struct nfs4_createdata *data;
4645 int mode = sattr->ia_mode;
4646 int status = -ENOMEM;
4647
4648 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4649 if (data == NULL)
4650 goto out;
4651
4652 if (S_ISFIFO(mode))
4653 data->arg.ftype = NF4FIFO;
4654 else if (S_ISBLK(mode)) {
4655 data->arg.ftype = NF4BLK;
4656 data->arg.u.device.specdata1 = MAJOR(rdev);
4657 data->arg.u.device.specdata2 = MINOR(rdev);
4658 }
4659 else if (S_ISCHR(mode)) {
4660 data->arg.ftype = NF4CHR;
4661 data->arg.u.device.specdata1 = MAJOR(rdev);
4662 data->arg.u.device.specdata2 = MINOR(rdev);
4663 } else if (!S_ISSOCK(mode)) {
4664 status = -EINVAL;
4665 goto out_free;
4666 }
4667
4668 data->arg.label = label;
4669 status = nfs4_do_create(dir, dentry, data);
4670 out_free:
4671 nfs4_free_createdata(data);
4672 out:
4673 return status;
4674 }
4675
4676 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4677 struct iattr *sattr, dev_t rdev)
4678 {
4679 struct nfs_server *server = NFS_SERVER(dir);
4680 struct nfs4_exception exception = { };
4681 struct nfs4_label l, *label = NULL;
4682 int err;
4683
4684 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4685
4686 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4687 sattr->ia_mode &= ~current_umask();
4688 do {
4689 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4690 trace_nfs4_mknod(dir, &dentry->d_name, err);
4691 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4692 &exception);
4693 } while (exception.retry);
4694
4695 nfs4_label_release_security(label);
4696
4697 return err;
4698 }
4699
4700 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4701 struct nfs_fsstat *fsstat)
4702 {
4703 struct nfs4_statfs_arg args = {
4704 .fh = fhandle,
4705 .bitmask = server->attr_bitmask,
4706 };
4707 struct nfs4_statfs_res res = {
4708 .fsstat = fsstat,
4709 };
4710 struct rpc_message msg = {
4711 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4712 .rpc_argp = &args,
4713 .rpc_resp = &res,
4714 };
4715
4716 nfs_fattr_init(fsstat->fattr);
4717 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4718 }
4719
4720 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4721 {
4722 struct nfs4_exception exception = { };
4723 int err;
4724 do {
4725 err = nfs4_handle_exception(server,
4726 _nfs4_proc_statfs(server, fhandle, fsstat),
4727 &exception);
4728 } while (exception.retry);
4729 return err;
4730 }
4731
4732 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4733 struct nfs_fsinfo *fsinfo)
4734 {
4735 struct nfs4_fsinfo_arg args = {
4736 .fh = fhandle,
4737 .bitmask = server->attr_bitmask,
4738 };
4739 struct nfs4_fsinfo_res res = {
4740 .fsinfo = fsinfo,
4741 };
4742 struct rpc_message msg = {
4743 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4744 .rpc_argp = &args,
4745 .rpc_resp = &res,
4746 };
4747
4748 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4749 }
4750
4751 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4752 {
4753 struct nfs4_exception exception = { };
4754 unsigned long now = jiffies;
4755 int err;
4756
4757 do {
4758 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4759 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4760 if (err == 0) {
4761 nfs4_set_lease_period(server->nfs_client,
4762 fsinfo->lease_time * HZ,
4763 now);
4764 break;
4765 }
4766 err = nfs4_handle_exception(server, err, &exception);
4767 } while (exception.retry);
4768 return err;
4769 }
4770
4771 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4772 {
4773 int error;
4774
4775 nfs_fattr_init(fsinfo->fattr);
4776 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4777 if (error == 0) {
4778 /* block layout checks this! */
4779 server->pnfs_blksize = fsinfo->blksize;
4780 set_pnfs_layoutdriver(server, fhandle, fsinfo);
4781 }
4782
4783 return error;
4784 }
4785
4786 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4787 struct nfs_pathconf *pathconf)
4788 {
4789 struct nfs4_pathconf_arg args = {
4790 .fh = fhandle,
4791 .bitmask = server->attr_bitmask,
4792 };
4793 struct nfs4_pathconf_res res = {
4794 .pathconf = pathconf,
4795 };
4796 struct rpc_message msg = {
4797 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4798 .rpc_argp = &args,
4799 .rpc_resp = &res,
4800 };
4801
4802 /* None of the pathconf attributes are mandatory to implement */
4803 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4804 memset(pathconf, 0, sizeof(*pathconf));
4805 return 0;
4806 }
4807
4808 nfs_fattr_init(pathconf->fattr);
4809 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4810 }
4811
4812 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4813 struct nfs_pathconf *pathconf)
4814 {
4815 struct nfs4_exception exception = { };
4816 int err;
4817
4818 do {
4819 err = nfs4_handle_exception(server,
4820 _nfs4_proc_pathconf(server, fhandle, pathconf),
4821 &exception);
4822 } while (exception.retry);
4823 return err;
4824 }
4825
4826 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4827 const struct nfs_open_context *ctx,
4828 const struct nfs_lock_context *l_ctx,
4829 fmode_t fmode)
4830 {
4831 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
4832 }
4833 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4834
4835 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4836 const struct nfs_open_context *ctx,
4837 const struct nfs_lock_context *l_ctx,
4838 fmode_t fmode)
4839 {
4840 nfs4_stateid current_stateid;
4841
4842 /* If the current stateid represents a lost lock, then exit */
4843 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4844 return true;
4845 return nfs4_stateid_match(stateid, &current_stateid);
4846 }
4847
4848 static bool nfs4_error_stateid_expired(int err)
4849 {
4850 switch (err) {
4851 case -NFS4ERR_DELEG_REVOKED:
4852 case -NFS4ERR_ADMIN_REVOKED:
4853 case -NFS4ERR_BAD_STATEID:
4854 case -NFS4ERR_STALE_STATEID:
4855 case -NFS4ERR_OLD_STATEID:
4856 case -NFS4ERR_OPENMODE:
4857 case -NFS4ERR_EXPIRED:
4858 return true;
4859 }
4860 return false;
4861 }
4862
4863 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4864 {
4865 struct nfs_server *server = NFS_SERVER(hdr->inode);
4866
4867 trace_nfs4_read(hdr, task->tk_status);
4868 if (task->tk_status < 0) {
4869 struct nfs4_exception exception = {
4870 .inode = hdr->inode,
4871 .state = hdr->args.context->state,
4872 .stateid = &hdr->args.stateid,
4873 };
4874 task->tk_status = nfs4_async_handle_exception(task,
4875 server, task->tk_status, &exception);
4876 if (exception.retry) {
4877 rpc_restart_call_prepare(task);
4878 return -EAGAIN;
4879 }
4880 }
4881
4882 if (task->tk_status > 0)
4883 renew_lease(server, hdr->timestamp);
4884 return 0;
4885 }
4886
4887 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4888 struct nfs_pgio_args *args)
4889 {
4890
4891 if (!nfs4_error_stateid_expired(task->tk_status) ||
4892 nfs4_stateid_is_current(&args->stateid,
4893 args->context,
4894 args->lock_context,
4895 FMODE_READ))
4896 return false;
4897 rpc_restart_call_prepare(task);
4898 return true;
4899 }
4900
4901 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4902 {
4903
4904 dprintk("--> %s\n", __func__);
4905
4906 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4907 return -EAGAIN;
4908 if (nfs4_read_stateid_changed(task, &hdr->args))
4909 return -EAGAIN;
4910 if (task->tk_status > 0)
4911 nfs_invalidate_atime(hdr->inode);
4912 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4913 nfs4_read_done_cb(task, hdr);
4914 }
4915
4916 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4917 struct rpc_message *msg)
4918 {
4919 hdr->timestamp = jiffies;
4920 if (!hdr->pgio_done_cb)
4921 hdr->pgio_done_cb = nfs4_read_done_cb;
4922 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4923 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
4924 }
4925
4926 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4927 struct nfs_pgio_header *hdr)
4928 {
4929 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
4930 &hdr->args.seq_args,
4931 &hdr->res.seq_res,
4932 task))
4933 return 0;
4934 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4935 hdr->args.lock_context,
4936 hdr->rw_mode) == -EIO)
4937 return -EIO;
4938 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4939 return -EIO;
4940 return 0;
4941 }
4942
4943 static int nfs4_write_done_cb(struct rpc_task *task,
4944 struct nfs_pgio_header *hdr)
4945 {
4946 struct inode *inode = hdr->inode;
4947
4948 trace_nfs4_write(hdr, task->tk_status);
4949 if (task->tk_status < 0) {
4950 struct nfs4_exception exception = {
4951 .inode = hdr->inode,
4952 .state = hdr->args.context->state,
4953 .stateid = &hdr->args.stateid,
4954 };
4955 task->tk_status = nfs4_async_handle_exception(task,
4956 NFS_SERVER(inode), task->tk_status,
4957 &exception);
4958 if (exception.retry) {
4959 rpc_restart_call_prepare(task);
4960 return -EAGAIN;
4961 }
4962 }
4963 if (task->tk_status >= 0) {
4964 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4965 nfs_writeback_update_inode(hdr);
4966 }
4967 return 0;
4968 }
4969
4970 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4971 struct nfs_pgio_args *args)
4972 {
4973
4974 if (!nfs4_error_stateid_expired(task->tk_status) ||
4975 nfs4_stateid_is_current(&args->stateid,
4976 args->context,
4977 args->lock_context,
4978 FMODE_WRITE))
4979 return false;
4980 rpc_restart_call_prepare(task);
4981 return true;
4982 }
4983
4984 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4985 {
4986 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4987 return -EAGAIN;
4988 if (nfs4_write_stateid_changed(task, &hdr->args))
4989 return -EAGAIN;
4990 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4991 nfs4_write_done_cb(task, hdr);
4992 }
4993
4994 static
4995 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4996 {
4997 /* Don't request attributes for pNFS or O_DIRECT writes */
4998 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4999 return false;
5000 /* Otherwise, request attributes if and only if we don't hold
5001 * a delegation
5002 */
5003 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5004 }
5005
5006 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5007 struct rpc_message *msg,
5008 struct rpc_clnt **clnt)
5009 {
5010 struct nfs_server *server = NFS_SERVER(hdr->inode);
5011
5012 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5013 hdr->args.bitmask = NULL;
5014 hdr->res.fattr = NULL;
5015 } else
5016 hdr->args.bitmask = server->cache_consistency_bitmask;
5017
5018 if (!hdr->pgio_done_cb)
5019 hdr->pgio_done_cb = nfs4_write_done_cb;
5020 hdr->res.server = server;
5021 hdr->timestamp = jiffies;
5022
5023 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5024 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1, 0);
5025 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5026 }
5027
5028 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5029 {
5030 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5031 &data->args.seq_args,
5032 &data->res.seq_res,
5033 task);
5034 }
5035
5036 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5037 {
5038 struct inode *inode = data->inode;
5039
5040 trace_nfs4_commit(data, task->tk_status);
5041 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5042 NULL, NULL) == -EAGAIN) {
5043 rpc_restart_call_prepare(task);
5044 return -EAGAIN;
5045 }
5046 return 0;
5047 }
5048
5049 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5050 {
5051 if (!nfs4_sequence_done(task, &data->res.seq_res))
5052 return -EAGAIN;
5053 return data->commit_done_cb(task, data);
5054 }
5055
5056 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5057 struct rpc_clnt **clnt)
5058 {
5059 struct nfs_server *server = NFS_SERVER(data->inode);
5060
5061 if (data->commit_done_cb == NULL)
5062 data->commit_done_cb = nfs4_commit_done_cb;
5063 data->res.server = server;
5064 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5065 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5066 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5067 }
5068
5069 struct nfs4_renewdata {
5070 struct nfs_client *client;
5071 unsigned long timestamp;
5072 };
5073
5074 /*
5075 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5076 * standalone procedure for queueing an asynchronous RENEW.
5077 */
5078 static void nfs4_renew_release(void *calldata)
5079 {
5080 struct nfs4_renewdata *data = calldata;
5081 struct nfs_client *clp = data->client;
5082
5083 if (refcount_read(&clp->cl_count) > 1)
5084 nfs4_schedule_state_renewal(clp);
5085 nfs_put_client(clp);
5086 kfree(data);
5087 }
5088
5089 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5090 {
5091 struct nfs4_renewdata *data = calldata;
5092 struct nfs_client *clp = data->client;
5093 unsigned long timestamp = data->timestamp;
5094
5095 trace_nfs4_renew_async(clp, task->tk_status);
5096 switch (task->tk_status) {
5097 case 0:
5098 break;
5099 case -NFS4ERR_LEASE_MOVED:
5100 nfs4_schedule_lease_moved_recovery(clp);
5101 break;
5102 default:
5103 /* Unless we're shutting down, schedule state recovery! */
5104 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5105 return;
5106 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5107 nfs4_schedule_lease_recovery(clp);
5108 return;
5109 }
5110 nfs4_schedule_path_down_recovery(clp);
5111 }
5112 do_renew_lease(clp, timestamp);
5113 }
5114
5115 static const struct rpc_call_ops nfs4_renew_ops = {
5116 .rpc_call_done = nfs4_renew_done,
5117 .rpc_release = nfs4_renew_release,
5118 };
5119
5120 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5121 {
5122 struct rpc_message msg = {
5123 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5124 .rpc_argp = clp,
5125 .rpc_cred = cred,
5126 };
5127 struct nfs4_renewdata *data;
5128
5129 if (renew_flags == 0)
5130 return 0;
5131 if (!refcount_inc_not_zero(&clp->cl_count))
5132 return -EIO;
5133 data = kmalloc(sizeof(*data), GFP_NOFS);
5134 if (data == NULL) {
5135 nfs_put_client(clp);
5136 return -ENOMEM;
5137 }
5138 data->client = clp;
5139 data->timestamp = jiffies;
5140 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5141 &nfs4_renew_ops, data);
5142 }
5143
5144 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
5145 {
5146 struct rpc_message msg = {
5147 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5148 .rpc_argp = clp,
5149 .rpc_cred = cred,
5150 };
5151 unsigned long now = jiffies;
5152 int status;
5153
5154 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5155 if (status < 0)
5156 return status;
5157 do_renew_lease(clp, now);
5158 return 0;
5159 }
5160
5161 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5162 {
5163 return server->caps & NFS_CAP_ACLS;
5164 }
5165
5166 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5167 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5168 * the stack.
5169 */
5170 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5171
5172 static int buf_to_pages_noslab(const void *buf, size_t buflen,
5173 struct page **pages)
5174 {
5175 struct page *newpage, **spages;
5176 int rc = 0;
5177 size_t len;
5178 spages = pages;
5179
5180 do {
5181 len = min_t(size_t, PAGE_SIZE, buflen);
5182 newpage = alloc_page(GFP_KERNEL);
5183
5184 if (newpage == NULL)
5185 goto unwind;
5186 memcpy(page_address(newpage), buf, len);
5187 buf += len;
5188 buflen -= len;
5189 *pages++ = newpage;
5190 rc++;
5191 } while (buflen != 0);
5192
5193 return rc;
5194
5195 unwind:
5196 for(; rc > 0; rc--)
5197 __free_page(spages[rc-1]);
5198 return -ENOMEM;
5199 }
5200
5201 struct nfs4_cached_acl {
5202 int cached;
5203 size_t len;
5204 char data[0];
5205 };
5206
5207 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5208 {
5209 struct nfs_inode *nfsi = NFS_I(inode);
5210
5211 spin_lock(&inode->i_lock);
5212 kfree(nfsi->nfs4_acl);
5213 nfsi->nfs4_acl = acl;
5214 spin_unlock(&inode->i_lock);
5215 }
5216
5217 static void nfs4_zap_acl_attr(struct inode *inode)
5218 {
5219 nfs4_set_cached_acl(inode, NULL);
5220 }
5221
5222 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5223 {
5224 struct nfs_inode *nfsi = NFS_I(inode);
5225 struct nfs4_cached_acl *acl;
5226 int ret = -ENOENT;
5227
5228 spin_lock(&inode->i_lock);
5229 acl = nfsi->nfs4_acl;
5230 if (acl == NULL)
5231 goto out;
5232 if (buf == NULL) /* user is just asking for length */
5233 goto out_len;
5234 if (acl->cached == 0)
5235 goto out;
5236 ret = -ERANGE; /* see getxattr(2) man page */
5237 if (acl->len > buflen)
5238 goto out;
5239 memcpy(buf, acl->data, acl->len);
5240 out_len:
5241 ret = acl->len;
5242 out:
5243 spin_unlock(&inode->i_lock);
5244 return ret;
5245 }
5246
5247 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5248 {
5249 struct nfs4_cached_acl *acl;
5250 size_t buflen = sizeof(*acl) + acl_len;
5251
5252 if (buflen <= PAGE_SIZE) {
5253 acl = kmalloc(buflen, GFP_KERNEL);
5254 if (acl == NULL)
5255 goto out;
5256 acl->cached = 1;
5257 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5258 } else {
5259 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5260 if (acl == NULL)
5261 goto out;
5262 acl->cached = 0;
5263 }
5264 acl->len = acl_len;
5265 out:
5266 nfs4_set_cached_acl(inode, acl);
5267 }
5268
5269 /*
5270 * The getxattr API returns the required buffer length when called with a
5271 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5272 * the required buf. On a NULL buf, we send a page of data to the server
5273 * guessing that the ACL request can be serviced by a page. If so, we cache
5274 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5275 * the cache. If not so, we throw away the page, and cache the required
5276 * length. The next getxattr call will then produce another round trip to
5277 * the server, this time with the input buf of the required size.
5278 */
5279 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5280 {
5281 struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, };
5282 struct nfs_getaclargs args = {
5283 .fh = NFS_FH(inode),
5284 .acl_pages = pages,
5285 .acl_len = buflen,
5286 };
5287 struct nfs_getaclres res = {
5288 .acl_len = buflen,
5289 };
5290 struct rpc_message msg = {
5291 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5292 .rpc_argp = &args,
5293 .rpc_resp = &res,
5294 };
5295 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5296 int ret = -ENOMEM, i;
5297
5298 if (npages > ARRAY_SIZE(pages))
5299 return -ERANGE;
5300
5301 for (i = 0; i < npages; i++) {
5302 pages[i] = alloc_page(GFP_KERNEL);
5303 if (!pages[i])
5304 goto out_free;
5305 }
5306
5307 /* for decoding across pages */
5308 res.acl_scratch = alloc_page(GFP_KERNEL);
5309 if (!res.acl_scratch)
5310 goto out_free;
5311
5312 args.acl_len = npages * PAGE_SIZE;
5313
5314 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
5315 __func__, buf, buflen, npages, args.acl_len);
5316 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5317 &msg, &args.seq_args, &res.seq_res, 0);
5318 if (ret)
5319 goto out_free;
5320
5321 /* Handle the case where the passed-in buffer is too short */
5322 if (res.acl_flags & NFS4_ACL_TRUNC) {
5323 /* Did the user only issue a request for the acl length? */
5324 if (buf == NULL)
5325 goto out_ok;
5326 ret = -ERANGE;
5327 goto out_free;
5328 }
5329 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5330 if (buf) {
5331 if (res.acl_len > buflen) {
5332 ret = -ERANGE;
5333 goto out_free;
5334 }
5335 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5336 }
5337 out_ok:
5338 ret = res.acl_len;
5339 out_free:
5340 for (i = 0; i < npages; i++)
5341 if (pages[i])
5342 __free_page(pages[i]);
5343 if (res.acl_scratch)
5344 __free_page(res.acl_scratch);
5345 return ret;
5346 }
5347
5348 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5349 {
5350 struct nfs4_exception exception = { };
5351 ssize_t ret;
5352 do {
5353 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5354 trace_nfs4_get_acl(inode, ret);
5355 if (ret >= 0)
5356 break;
5357 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5358 } while (exception.retry);
5359 return ret;
5360 }
5361
5362 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5363 {
5364 struct nfs_server *server = NFS_SERVER(inode);
5365 int ret;
5366
5367 if (!nfs4_server_supports_acls(server))
5368 return -EOPNOTSUPP;
5369 ret = nfs_revalidate_inode(server, inode);
5370 if (ret < 0)
5371 return ret;
5372 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5373 nfs_zap_acl_cache(inode);
5374 ret = nfs4_read_cached_acl(inode, buf, buflen);
5375 if (ret != -ENOENT)
5376 /* -ENOENT is returned if there is no ACL or if there is an ACL
5377 * but no cached acl data, just the acl length */
5378 return ret;
5379 return nfs4_get_acl_uncached(inode, buf, buflen);
5380 }
5381
5382 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5383 {
5384 struct nfs_server *server = NFS_SERVER(inode);
5385 struct page *pages[NFS4ACL_MAXPAGES];
5386 struct nfs_setaclargs arg = {
5387 .fh = NFS_FH(inode),
5388 .acl_pages = pages,
5389 .acl_len = buflen,
5390 };
5391 struct nfs_setaclres res;
5392 struct rpc_message msg = {
5393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5394 .rpc_argp = &arg,
5395 .rpc_resp = &res,
5396 };
5397 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5398 int ret, i;
5399
5400 if (!nfs4_server_supports_acls(server))
5401 return -EOPNOTSUPP;
5402 if (npages > ARRAY_SIZE(pages))
5403 return -ERANGE;
5404 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5405 if (i < 0)
5406 return i;
5407 nfs4_inode_make_writeable(inode);
5408 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5409
5410 /*
5411 * Free each page after tx, so the only ref left is
5412 * held by the network stack
5413 */
5414 for (; i > 0; i--)
5415 put_page(pages[i-1]);
5416
5417 /*
5418 * Acl update can result in inode attribute update.
5419 * so mark the attribute cache invalid.
5420 */
5421 spin_lock(&inode->i_lock);
5422 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE
5423 | NFS_INO_INVALID_CTIME
5424 | NFS_INO_REVAL_FORCED;
5425 spin_unlock(&inode->i_lock);
5426 nfs_access_zap_cache(inode);
5427 nfs_zap_acl_cache(inode);
5428 return ret;
5429 }
5430
5431 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5432 {
5433 struct nfs4_exception exception = { };
5434 int err;
5435 do {
5436 err = __nfs4_proc_set_acl(inode, buf, buflen);
5437 trace_nfs4_set_acl(inode, err);
5438 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5439 &exception);
5440 } while (exception.retry);
5441 return err;
5442 }
5443
5444 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5445 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5446 size_t buflen)
5447 {
5448 struct nfs_server *server = NFS_SERVER(inode);
5449 struct nfs_fattr fattr;
5450 struct nfs4_label label = {0, 0, buflen, buf};
5451
5452 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5453 struct nfs4_getattr_arg arg = {
5454 .fh = NFS_FH(inode),
5455 .bitmask = bitmask,
5456 };
5457 struct nfs4_getattr_res res = {
5458 .fattr = &fattr,
5459 .label = &label,
5460 .server = server,
5461 };
5462 struct rpc_message msg = {
5463 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5464 .rpc_argp = &arg,
5465 .rpc_resp = &res,
5466 };
5467 int ret;
5468
5469 nfs_fattr_init(&fattr);
5470
5471 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5472 if (ret)
5473 return ret;
5474 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5475 return -ENOENT;
5476 if (buflen < label.len)
5477 return -ERANGE;
5478 return 0;
5479 }
5480
5481 static int nfs4_get_security_label(struct inode *inode, void *buf,
5482 size_t buflen)
5483 {
5484 struct nfs4_exception exception = { };
5485 int err;
5486
5487 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5488 return -EOPNOTSUPP;
5489
5490 do {
5491 err = _nfs4_get_security_label(inode, buf, buflen);
5492 trace_nfs4_get_security_label(inode, err);
5493 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5494 &exception);
5495 } while (exception.retry);
5496 return err;
5497 }
5498
5499 static int _nfs4_do_set_security_label(struct inode *inode,
5500 struct nfs4_label *ilabel,
5501 struct nfs_fattr *fattr,
5502 struct nfs4_label *olabel)
5503 {
5504
5505 struct iattr sattr = {0};
5506 struct nfs_server *server = NFS_SERVER(inode);
5507 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5508 struct nfs_setattrargs arg = {
5509 .fh = NFS_FH(inode),
5510 .iap = &sattr,
5511 .server = server,
5512 .bitmask = bitmask,
5513 .label = ilabel,
5514 };
5515 struct nfs_setattrres res = {
5516 .fattr = fattr,
5517 .label = olabel,
5518 .server = server,
5519 };
5520 struct rpc_message msg = {
5521 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5522 .rpc_argp = &arg,
5523 .rpc_resp = &res,
5524 };
5525 int status;
5526
5527 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5528
5529 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5530 if (status)
5531 dprintk("%s failed: %d\n", __func__, status);
5532
5533 return status;
5534 }
5535
5536 static int nfs4_do_set_security_label(struct inode *inode,
5537 struct nfs4_label *ilabel,
5538 struct nfs_fattr *fattr,
5539 struct nfs4_label *olabel)
5540 {
5541 struct nfs4_exception exception = { };
5542 int err;
5543
5544 do {
5545 err = _nfs4_do_set_security_label(inode, ilabel,
5546 fattr, olabel);
5547 trace_nfs4_set_security_label(inode, err);
5548 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5549 &exception);
5550 } while (exception.retry);
5551 return err;
5552 }
5553
5554 static int
5555 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5556 {
5557 struct nfs4_label ilabel, *olabel = NULL;
5558 struct nfs_fattr fattr;
5559 struct rpc_cred *cred;
5560 int status;
5561
5562 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5563 return -EOPNOTSUPP;
5564
5565 nfs_fattr_init(&fattr);
5566
5567 ilabel.pi = 0;
5568 ilabel.lfs = 0;
5569 ilabel.label = (char *)buf;
5570 ilabel.len = buflen;
5571
5572 cred = rpc_lookup_cred();
5573 if (IS_ERR(cred))
5574 return PTR_ERR(cred);
5575
5576 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5577 if (IS_ERR(olabel)) {
5578 status = -PTR_ERR(olabel);
5579 goto out;
5580 }
5581
5582 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5583 if (status == 0)
5584 nfs_setsecurity(inode, &fattr, olabel);
5585
5586 nfs4_label_free(olabel);
5587 out:
5588 put_rpccred(cred);
5589 return status;
5590 }
5591 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
5592
5593
5594 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5595 nfs4_verifier *bootverf)
5596 {
5597 __be32 verf[2];
5598
5599 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5600 /* An impossible timestamp guarantees this value
5601 * will never match a generated boot time. */
5602 verf[0] = cpu_to_be32(U32_MAX);
5603 verf[1] = cpu_to_be32(U32_MAX);
5604 } else {
5605 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5606 u64 ns = ktime_to_ns(nn->boot_time);
5607
5608 verf[0] = cpu_to_be32(ns >> 32);
5609 verf[1] = cpu_to_be32(ns);
5610 }
5611 memcpy(bootverf->data, verf, sizeof(bootverf->data));
5612 }
5613
5614 static int
5615 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5616 {
5617 size_t len;
5618 char *str;
5619
5620 if (clp->cl_owner_id != NULL)
5621 return 0;
5622
5623 rcu_read_lock();
5624 len = 14 +
5625 strlen(clp->cl_rpcclient->cl_nodename) +
5626 1 +
5627 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5628 1;
5629 rcu_read_unlock();
5630 if (nfs4_client_id_uniquifier[0] != '\0')
5631 len += strlen(nfs4_client_id_uniquifier) + 1;
5632 if (len > NFS4_OPAQUE_LIMIT + 1)
5633 return -EINVAL;
5634
5635 /*
5636 * Since this string is allocated at mount time, and held until the
5637 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5638 * about a memory-reclaim deadlock.
5639 */
5640 str = kmalloc(len, GFP_KERNEL);
5641 if (!str)
5642 return -ENOMEM;
5643
5644 rcu_read_lock();
5645 if (nfs4_client_id_uniquifier[0] != '\0')
5646 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
5647 clp->cl_rpcclient->cl_nodename,
5648 nfs4_client_id_uniquifier,
5649 rpc_peeraddr2str(clp->cl_rpcclient,
5650 RPC_DISPLAY_ADDR));
5651 else
5652 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
5653 clp->cl_rpcclient->cl_nodename,
5654 rpc_peeraddr2str(clp->cl_rpcclient,
5655 RPC_DISPLAY_ADDR));
5656 rcu_read_unlock();
5657
5658 clp->cl_owner_id = str;
5659 return 0;
5660 }
5661
5662 static int
5663 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5664 {
5665 size_t len;
5666 char *str;
5667
5668 len = 10 + 10 + 1 + 10 + 1 +
5669 strlen(nfs4_client_id_uniquifier) + 1 +
5670 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5671
5672 if (len > NFS4_OPAQUE_LIMIT + 1)
5673 return -EINVAL;
5674
5675 /*
5676 * Since this string is allocated at mount time, and held until the
5677 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5678 * about a memory-reclaim deadlock.
5679 */
5680 str = kmalloc(len, GFP_KERNEL);
5681 if (!str)
5682 return -ENOMEM;
5683
5684 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5685 clp->rpc_ops->version, clp->cl_minorversion,
5686 nfs4_client_id_uniquifier,
5687 clp->cl_rpcclient->cl_nodename);
5688 clp->cl_owner_id = str;
5689 return 0;
5690 }
5691
5692 static int
5693 nfs4_init_uniform_client_string(struct nfs_client *clp)
5694 {
5695 size_t len;
5696 char *str;
5697
5698 if (clp->cl_owner_id != NULL)
5699 return 0;
5700
5701 if (nfs4_client_id_uniquifier[0] != '\0')
5702 return nfs4_init_uniquifier_client_string(clp);
5703
5704 len = 10 + 10 + 1 + 10 + 1 +
5705 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5706
5707 if (len > NFS4_OPAQUE_LIMIT + 1)
5708 return -EINVAL;
5709
5710 /*
5711 * Since this string is allocated at mount time, and held until the
5712 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5713 * about a memory-reclaim deadlock.
5714 */
5715 str = kmalloc(len, GFP_KERNEL);
5716 if (!str)
5717 return -ENOMEM;
5718
5719 scnprintf(str, len, "Linux NFSv%u.%u %s",
5720 clp->rpc_ops->version, clp->cl_minorversion,
5721 clp->cl_rpcclient->cl_nodename);
5722 clp->cl_owner_id = str;
5723 return 0;
5724 }
5725
5726 /*
5727 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5728 * services. Advertise one based on the address family of the
5729 * clientaddr.
5730 */
5731 static unsigned int
5732 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5733 {
5734 if (strchr(clp->cl_ipaddr, ':') != NULL)
5735 return scnprintf(buf, len, "tcp6");
5736 else
5737 return scnprintf(buf, len, "tcp");
5738 }
5739
5740 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5741 {
5742 struct nfs4_setclientid *sc = calldata;
5743
5744 if (task->tk_status == 0)
5745 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5746 }
5747
5748 static const struct rpc_call_ops nfs4_setclientid_ops = {
5749 .rpc_call_done = nfs4_setclientid_done,
5750 };
5751
5752 /**
5753 * nfs4_proc_setclientid - Negotiate client ID
5754 * @clp: state data structure
5755 * @program: RPC program for NFSv4 callback service
5756 * @port: IP port number for NFS4 callback service
5757 * @cred: RPC credential to use for this call
5758 * @res: where to place the result
5759 *
5760 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5761 */
5762 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5763 unsigned short port, struct rpc_cred *cred,
5764 struct nfs4_setclientid_res *res)
5765 {
5766 nfs4_verifier sc_verifier;
5767 struct nfs4_setclientid setclientid = {
5768 .sc_verifier = &sc_verifier,
5769 .sc_prog = program,
5770 .sc_clnt = clp,
5771 };
5772 struct rpc_message msg = {
5773 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5774 .rpc_argp = &setclientid,
5775 .rpc_resp = res,
5776 .rpc_cred = cred,
5777 };
5778 struct rpc_task *task;
5779 struct rpc_task_setup task_setup_data = {
5780 .rpc_client = clp->cl_rpcclient,
5781 .rpc_message = &msg,
5782 .callback_ops = &nfs4_setclientid_ops,
5783 .callback_data = &setclientid,
5784 .flags = RPC_TASK_TIMEOUT,
5785 };
5786 int status;
5787
5788 /* nfs_client_id4 */
5789 nfs4_init_boot_verifier(clp, &sc_verifier);
5790
5791 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5792 status = nfs4_init_uniform_client_string(clp);
5793 else
5794 status = nfs4_init_nonuniform_client_string(clp);
5795
5796 if (status)
5797 goto out;
5798
5799 /* cb_client4 */
5800 setclientid.sc_netid_len =
5801 nfs4_init_callback_netid(clp,
5802 setclientid.sc_netid,
5803 sizeof(setclientid.sc_netid));
5804 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5805 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5806 clp->cl_ipaddr, port >> 8, port & 255);
5807
5808 dprintk("NFS call setclientid auth=%s, '%s'\n",
5809 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5810 clp->cl_owner_id);
5811 task = rpc_run_task(&task_setup_data);
5812 if (IS_ERR(task)) {
5813 status = PTR_ERR(task);
5814 goto out;
5815 }
5816 status = task->tk_status;
5817 if (setclientid.sc_cred) {
5818 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5819 put_rpccred(setclientid.sc_cred);
5820 }
5821 rpc_put_task(task);
5822 out:
5823 trace_nfs4_setclientid(clp, status);
5824 dprintk("NFS reply setclientid: %d\n", status);
5825 return status;
5826 }
5827
5828 /**
5829 * nfs4_proc_setclientid_confirm - Confirm client ID
5830 * @clp: state data structure
5831 * @res: result of a previous SETCLIENTID
5832 * @cred: RPC credential to use for this call
5833 *
5834 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5835 */
5836 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5837 struct nfs4_setclientid_res *arg,
5838 struct rpc_cred *cred)
5839 {
5840 struct rpc_message msg = {
5841 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5842 .rpc_argp = arg,
5843 .rpc_cred = cred,
5844 };
5845 int status;
5846
5847 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
5848 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5849 clp->cl_clientid);
5850 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5851 trace_nfs4_setclientid_confirm(clp, status);
5852 dprintk("NFS reply setclientid_confirm: %d\n", status);
5853 return status;
5854 }
5855
5856 struct nfs4_delegreturndata {
5857 struct nfs4_delegreturnargs args;
5858 struct nfs4_delegreturnres res;
5859 struct nfs_fh fh;
5860 nfs4_stateid stateid;
5861 unsigned long timestamp;
5862 struct {
5863 struct nfs4_layoutreturn_args arg;
5864 struct nfs4_layoutreturn_res res;
5865 struct nfs4_xdr_opaque_data ld_private;
5866 u32 roc_barrier;
5867 bool roc;
5868 } lr;
5869 struct nfs_fattr fattr;
5870 int rpc_status;
5871 struct inode *inode;
5872 };
5873
5874 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5875 {
5876 struct nfs4_delegreturndata *data = calldata;
5877 struct nfs4_exception exception = {
5878 .inode = data->inode,
5879 .stateid = &data->stateid,
5880 };
5881
5882 if (!nfs4_sequence_done(task, &data->res.seq_res))
5883 return;
5884
5885 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5886
5887 /* Handle Layoutreturn errors */
5888 if (data->args.lr_args && task->tk_status != 0) {
5889 switch(data->res.lr_ret) {
5890 default:
5891 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
5892 break;
5893 case 0:
5894 data->args.lr_args = NULL;
5895 data->res.lr_res = NULL;
5896 break;
5897 case -NFS4ERR_OLD_STATEID:
5898 if (nfs4_refresh_layout_stateid(&data->args.lr_args->stateid,
5899 data->inode))
5900 goto lr_restart;
5901 /* Fallthrough */
5902 case -NFS4ERR_ADMIN_REVOKED:
5903 case -NFS4ERR_DELEG_REVOKED:
5904 case -NFS4ERR_EXPIRED:
5905 case -NFS4ERR_BAD_STATEID:
5906 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
5907 case -NFS4ERR_WRONG_CRED:
5908 data->args.lr_args = NULL;
5909 data->res.lr_res = NULL;
5910 goto lr_restart;
5911 }
5912 }
5913
5914 switch (task->tk_status) {
5915 case 0:
5916 renew_lease(data->res.server, data->timestamp);
5917 break;
5918 case -NFS4ERR_ADMIN_REVOKED:
5919 case -NFS4ERR_DELEG_REVOKED:
5920 case -NFS4ERR_EXPIRED:
5921 nfs4_free_revoked_stateid(data->res.server,
5922 data->args.stateid,
5923 task->tk_msg.rpc_cred);
5924 /* Fallthrough */
5925 case -NFS4ERR_BAD_STATEID:
5926 case -NFS4ERR_STALE_STATEID:
5927 task->tk_status = 0;
5928 break;
5929 case -NFS4ERR_OLD_STATEID:
5930 if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
5931 goto out_restart;
5932 task->tk_status = 0;
5933 break;
5934 case -NFS4ERR_ACCESS:
5935 if (data->args.bitmask) {
5936 data->args.bitmask = NULL;
5937 data->res.fattr = NULL;
5938 goto out_restart;
5939 }
5940 /* Fallthrough */
5941 default:
5942 task->tk_status = nfs4_async_handle_exception(task,
5943 data->res.server, task->tk_status,
5944 &exception);
5945 if (exception.retry)
5946 goto out_restart;
5947 }
5948 data->rpc_status = task->tk_status;
5949 return;
5950 lr_restart:
5951 data->res.lr_ret = 0;
5952 out_restart:
5953 task->tk_status = 0;
5954 rpc_restart_call_prepare(task);
5955 }
5956
5957 static void nfs4_delegreturn_release(void *calldata)
5958 {
5959 struct nfs4_delegreturndata *data = calldata;
5960 struct inode *inode = data->inode;
5961
5962 if (inode) {
5963 if (data->lr.roc)
5964 pnfs_roc_release(&data->lr.arg, &data->lr.res,
5965 data->res.lr_ret);
5966 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5967 nfs_iput_and_deactive(inode);
5968 }
5969 kfree(calldata);
5970 }
5971
5972 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5973 {
5974 struct nfs4_delegreturndata *d_data;
5975
5976 d_data = (struct nfs4_delegreturndata *)data;
5977
5978 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task))
5979 return;
5980
5981 nfs4_setup_sequence(d_data->res.server->nfs_client,
5982 &d_data->args.seq_args,
5983 &d_data->res.seq_res,
5984 task);
5985 }
5986
5987 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5988 .rpc_call_prepare = nfs4_delegreturn_prepare,
5989 .rpc_call_done = nfs4_delegreturn_done,
5990 .rpc_release = nfs4_delegreturn_release,
5991 };
5992
5993 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5994 {
5995 struct nfs4_delegreturndata *data;
5996 struct nfs_server *server = NFS_SERVER(inode);
5997 struct rpc_task *task;
5998 struct rpc_message msg = {
5999 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6000 .rpc_cred = cred,
6001 };
6002 struct rpc_task_setup task_setup_data = {
6003 .rpc_client = server->client,
6004 .rpc_message = &msg,
6005 .callback_ops = &nfs4_delegreturn_ops,
6006 .flags = RPC_TASK_ASYNC,
6007 };
6008 int status = 0;
6009
6010 data = kzalloc(sizeof(*data), GFP_NOFS);
6011 if (data == NULL)
6012 return -ENOMEM;
6013 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
6014
6015 nfs4_state_protect(server->nfs_client,
6016 NFS_SP4_MACH_CRED_CLEANUP,
6017 &task_setup_data.rpc_client, &msg);
6018
6019 data->args.fhandle = &data->fh;
6020 data->args.stateid = &data->stateid;
6021 data->args.bitmask = server->cache_consistency_bitmask;
6022 nfs_copy_fh(&data->fh, NFS_FH(inode));
6023 nfs4_stateid_copy(&data->stateid, stateid);
6024 data->res.fattr = &data->fattr;
6025 data->res.server = server;
6026 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6027 data->lr.arg.ld_private = &data->lr.ld_private;
6028 nfs_fattr_init(data->res.fattr);
6029 data->timestamp = jiffies;
6030 data->rpc_status = 0;
6031 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
6032 data->inode = nfs_igrab_and_active(inode);
6033 if (data->inode) {
6034 if (data->lr.roc) {
6035 data->args.lr_args = &data->lr.arg;
6036 data->res.lr_res = &data->lr.res;
6037 }
6038 } else if (data->lr.roc) {
6039 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
6040 data->lr.roc = false;
6041 }
6042
6043 task_setup_data.callback_data = data;
6044 msg.rpc_argp = &data->args;
6045 msg.rpc_resp = &data->res;
6046 task = rpc_run_task(&task_setup_data);
6047 if (IS_ERR(task))
6048 return PTR_ERR(task);
6049 if (!issync)
6050 goto out;
6051 status = rpc_wait_for_completion_task(task);
6052 if (status != 0)
6053 goto out;
6054 status = data->rpc_status;
6055 out:
6056 rpc_put_task(task);
6057 return status;
6058 }
6059
6060 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
6061 {
6062 struct nfs_server *server = NFS_SERVER(inode);
6063 struct nfs4_exception exception = { };
6064 int err;
6065 do {
6066 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6067 trace_nfs4_delegreturn(inode, stateid, err);
6068 switch (err) {
6069 case -NFS4ERR_STALE_STATEID:
6070 case -NFS4ERR_EXPIRED:
6071 case 0:
6072 return 0;
6073 }
6074 err = nfs4_handle_exception(server, err, &exception);
6075 } while (exception.retry);
6076 return err;
6077 }
6078
6079 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6080 {
6081 struct inode *inode = state->inode;
6082 struct nfs_server *server = NFS_SERVER(inode);
6083 struct nfs_client *clp = server->nfs_client;
6084 struct nfs_lockt_args arg = {
6085 .fh = NFS_FH(inode),
6086 .fl = request,
6087 };
6088 struct nfs_lockt_res res = {
6089 .denied = request,
6090 };
6091 struct rpc_message msg = {
6092 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6093 .rpc_argp = &arg,
6094 .rpc_resp = &res,
6095 .rpc_cred = state->owner->so_cred,
6096 };
6097 struct nfs4_lock_state *lsp;
6098 int status;
6099
6100 arg.lock_owner.clientid = clp->cl_clientid;
6101 status = nfs4_set_lock_state(state, request);
6102 if (status != 0)
6103 goto out;
6104 lsp = request->fl_u.nfs4_fl.owner;
6105 arg.lock_owner.id = lsp->ls_seqid.owner_id;
6106 arg.lock_owner.s_dev = server->s_dev;
6107 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6108 switch (status) {
6109 case 0:
6110 request->fl_type = F_UNLCK;
6111 break;
6112 case -NFS4ERR_DENIED:
6113 status = 0;
6114 }
6115 request->fl_ops->fl_release_private(request);
6116 request->fl_ops = NULL;
6117 out:
6118 return status;
6119 }
6120
6121 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6122 {
6123 struct nfs4_exception exception = { };
6124 int err;
6125
6126 do {
6127 err = _nfs4_proc_getlk(state, cmd, request);
6128 trace_nfs4_get_lock(request, state, cmd, err);
6129 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6130 &exception);
6131 } while (exception.retry);
6132 return err;
6133 }
6134
6135 struct nfs4_unlockdata {
6136 struct nfs_locku_args arg;
6137 struct nfs_locku_res res;
6138 struct nfs4_lock_state *lsp;
6139 struct nfs_open_context *ctx;
6140 struct nfs_lock_context *l_ctx;
6141 struct file_lock fl;
6142 struct nfs_server *server;
6143 unsigned long timestamp;
6144 };
6145
6146 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6147 struct nfs_open_context *ctx,
6148 struct nfs4_lock_state *lsp,
6149 struct nfs_seqid *seqid)
6150 {
6151 struct nfs4_unlockdata *p;
6152 struct inode *inode = lsp->ls_state->inode;
6153
6154 p = kzalloc(sizeof(*p), GFP_NOFS);
6155 if (p == NULL)
6156 return NULL;
6157 p->arg.fh = NFS_FH(inode);
6158 p->arg.fl = &p->fl;
6159 p->arg.seqid = seqid;
6160 p->res.seqid = seqid;
6161 p->lsp = lsp;
6162 refcount_inc(&lsp->ls_count);
6163 /* Ensure we don't close file until we're done freeing locks! */
6164 p->ctx = get_nfs_open_context(ctx);
6165 p->l_ctx = nfs_get_lock_context(ctx);
6166 memcpy(&p->fl, fl, sizeof(p->fl));
6167 p->server = NFS_SERVER(inode);
6168 return p;
6169 }
6170
6171 static void nfs4_locku_release_calldata(void *data)
6172 {
6173 struct nfs4_unlockdata *calldata = data;
6174 nfs_free_seqid(calldata->arg.seqid);
6175 nfs4_put_lock_state(calldata->lsp);
6176 nfs_put_lock_context(calldata->l_ctx);
6177 put_nfs_open_context(calldata->ctx);
6178 kfree(calldata);
6179 }
6180
6181 static void nfs4_locku_done(struct rpc_task *task, void *data)
6182 {
6183 struct nfs4_unlockdata *calldata = data;
6184 struct nfs4_exception exception = {
6185 .inode = calldata->lsp->ls_state->inode,
6186 .stateid = &calldata->arg.stateid,
6187 };
6188
6189 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6190 return;
6191 switch (task->tk_status) {
6192 case 0:
6193 renew_lease(calldata->server, calldata->timestamp);
6194 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6195 if (nfs4_update_lock_stateid(calldata->lsp,
6196 &calldata->res.stateid))
6197 break;
6198 case -NFS4ERR_ADMIN_REVOKED:
6199 case -NFS4ERR_EXPIRED:
6200 nfs4_free_revoked_stateid(calldata->server,
6201 &calldata->arg.stateid,
6202 task->tk_msg.rpc_cred);
6203 case -NFS4ERR_BAD_STATEID:
6204 case -NFS4ERR_OLD_STATEID:
6205 case -NFS4ERR_STALE_STATEID:
6206 if (!nfs4_stateid_match(&calldata->arg.stateid,
6207 &calldata->lsp->ls_stateid))
6208 rpc_restart_call_prepare(task);
6209 break;
6210 default:
6211 task->tk_status = nfs4_async_handle_exception(task,
6212 calldata->server, task->tk_status,
6213 &exception);
6214 if (exception.retry)
6215 rpc_restart_call_prepare(task);
6216 }
6217 nfs_release_seqid(calldata->arg.seqid);
6218 }
6219
6220 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6221 {
6222 struct nfs4_unlockdata *calldata = data;
6223
6224 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6225 nfs_async_iocounter_wait(task, calldata->l_ctx))
6226 return;
6227
6228 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6229 goto out_wait;
6230 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
6231 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6232 /* Note: exit _without_ running nfs4_locku_done */
6233 goto out_no_action;
6234 }
6235 calldata->timestamp = jiffies;
6236 if (nfs4_setup_sequence(calldata->server->nfs_client,
6237 &calldata->arg.seq_args,
6238 &calldata->res.seq_res,
6239 task) != 0)
6240 nfs_release_seqid(calldata->arg.seqid);
6241 return;
6242 out_no_action:
6243 task->tk_action = NULL;
6244 out_wait:
6245 nfs4_sequence_done(task, &calldata->res.seq_res);
6246 }
6247
6248 static const struct rpc_call_ops nfs4_locku_ops = {
6249 .rpc_call_prepare = nfs4_locku_prepare,
6250 .rpc_call_done = nfs4_locku_done,
6251 .rpc_release = nfs4_locku_release_calldata,
6252 };
6253
6254 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6255 struct nfs_open_context *ctx,
6256 struct nfs4_lock_state *lsp,
6257 struct nfs_seqid *seqid)
6258 {
6259 struct nfs4_unlockdata *data;
6260 struct rpc_message msg = {
6261 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6262 .rpc_cred = ctx->cred,
6263 };
6264 struct rpc_task_setup task_setup_data = {
6265 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6266 .rpc_message = &msg,
6267 .callback_ops = &nfs4_locku_ops,
6268 .workqueue = nfsiod_workqueue,
6269 .flags = RPC_TASK_ASYNC,
6270 };
6271
6272 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6273 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6274
6275 /* Ensure this is an unlock - when canceling a lock, the
6276 * canceled lock is passed in, and it won't be an unlock.
6277 */
6278 fl->fl_type = F_UNLCK;
6279 if (fl->fl_flags & FL_CLOSE)
6280 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6281
6282 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6283 if (data == NULL) {
6284 nfs_free_seqid(seqid);
6285 return ERR_PTR(-ENOMEM);
6286 }
6287
6288 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6289 msg.rpc_argp = &data->arg;
6290 msg.rpc_resp = &data->res;
6291 task_setup_data.callback_data = data;
6292 return rpc_run_task(&task_setup_data);
6293 }
6294
6295 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6296 {
6297 struct inode *inode = state->inode;
6298 struct nfs4_state_owner *sp = state->owner;
6299 struct nfs_inode *nfsi = NFS_I(inode);
6300 struct nfs_seqid *seqid;
6301 struct nfs4_lock_state *lsp;
6302 struct rpc_task *task;
6303 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6304 int status = 0;
6305 unsigned char fl_flags = request->fl_flags;
6306
6307 status = nfs4_set_lock_state(state, request);
6308 /* Unlock _before_ we do the RPC call */
6309 request->fl_flags |= FL_EXISTS;
6310 /* Exclude nfs_delegation_claim_locks() */
6311 mutex_lock(&sp->so_delegreturn_mutex);
6312 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6313 down_read(&nfsi->rwsem);
6314 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6315 up_read(&nfsi->rwsem);
6316 mutex_unlock(&sp->so_delegreturn_mutex);
6317 goto out;
6318 }
6319 up_read(&nfsi->rwsem);
6320 mutex_unlock(&sp->so_delegreturn_mutex);
6321 if (status != 0)
6322 goto out;
6323 /* Is this a delegated lock? */
6324 lsp = request->fl_u.nfs4_fl.owner;
6325 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6326 goto out;
6327 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6328 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6329 status = -ENOMEM;
6330 if (IS_ERR(seqid))
6331 goto out;
6332 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6333 status = PTR_ERR(task);
6334 if (IS_ERR(task))
6335 goto out;
6336 status = rpc_wait_for_completion_task(task);
6337 rpc_put_task(task);
6338 out:
6339 request->fl_flags = fl_flags;
6340 trace_nfs4_unlock(request, state, F_SETLK, status);
6341 return status;
6342 }
6343
6344 struct nfs4_lockdata {
6345 struct nfs_lock_args arg;
6346 struct nfs_lock_res res;
6347 struct nfs4_lock_state *lsp;
6348 struct nfs_open_context *ctx;
6349 struct file_lock fl;
6350 unsigned long timestamp;
6351 int rpc_status;
6352 int cancelled;
6353 struct nfs_server *server;
6354 };
6355
6356 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6357 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6358 gfp_t gfp_mask)
6359 {
6360 struct nfs4_lockdata *p;
6361 struct inode *inode = lsp->ls_state->inode;
6362 struct nfs_server *server = NFS_SERVER(inode);
6363 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6364
6365 p = kzalloc(sizeof(*p), gfp_mask);
6366 if (p == NULL)
6367 return NULL;
6368
6369 p->arg.fh = NFS_FH(inode);
6370 p->arg.fl = &p->fl;
6371 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6372 if (IS_ERR(p->arg.open_seqid))
6373 goto out_free;
6374 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6375 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6376 if (IS_ERR(p->arg.lock_seqid))
6377 goto out_free_seqid;
6378 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6379 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6380 p->arg.lock_owner.s_dev = server->s_dev;
6381 p->res.lock_seqid = p->arg.lock_seqid;
6382 p->lsp = lsp;
6383 p->server = server;
6384 refcount_inc(&lsp->ls_count);
6385 p->ctx = get_nfs_open_context(ctx);
6386 memcpy(&p->fl, fl, sizeof(p->fl));
6387 return p;
6388 out_free_seqid:
6389 nfs_free_seqid(p->arg.open_seqid);
6390 out_free:
6391 kfree(p);
6392 return NULL;
6393 }
6394
6395 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6396 {
6397 struct nfs4_lockdata *data = calldata;
6398 struct nfs4_state *state = data->lsp->ls_state;
6399
6400 dprintk("%s: begin!\n", __func__);
6401 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6402 goto out_wait;
6403 /* Do we need to do an open_to_lock_owner? */
6404 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6405 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6406 goto out_release_lock_seqid;
6407 }
6408 nfs4_stateid_copy(&data->arg.open_stateid,
6409 &state->open_stateid);
6410 data->arg.new_lock_owner = 1;
6411 data->res.open_seqid = data->arg.open_seqid;
6412 } else {
6413 data->arg.new_lock_owner = 0;
6414 nfs4_stateid_copy(&data->arg.lock_stateid,
6415 &data->lsp->ls_stateid);
6416 }
6417 if (!nfs4_valid_open_stateid(state)) {
6418 data->rpc_status = -EBADF;
6419 task->tk_action = NULL;
6420 goto out_release_open_seqid;
6421 }
6422 data->timestamp = jiffies;
6423 if (nfs4_setup_sequence(data->server->nfs_client,
6424 &data->arg.seq_args,
6425 &data->res.seq_res,
6426 task) == 0)
6427 return;
6428 out_release_open_seqid:
6429 nfs_release_seqid(data->arg.open_seqid);
6430 out_release_lock_seqid:
6431 nfs_release_seqid(data->arg.lock_seqid);
6432 out_wait:
6433 nfs4_sequence_done(task, &data->res.seq_res);
6434 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6435 }
6436
6437 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6438 {
6439 struct nfs4_lockdata *data = calldata;
6440 struct nfs4_lock_state *lsp = data->lsp;
6441
6442 dprintk("%s: begin!\n", __func__);
6443
6444 if (!nfs4_sequence_done(task, &data->res.seq_res))
6445 return;
6446
6447 data->rpc_status = task->tk_status;
6448 switch (task->tk_status) {
6449 case 0:
6450 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6451 data->timestamp);
6452 if (data->arg.new_lock && !data->cancelled) {
6453 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6454 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
6455 break;
6456 }
6457
6458 if (data->arg.new_lock_owner != 0) {
6459 nfs_confirm_seqid(&lsp->ls_seqid, 0);
6460 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6461 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6462 goto out_done;
6463 } else if (nfs4_update_lock_stateid(lsp, &data->res.stateid))
6464 goto out_done;
6465
6466 break;
6467 case -NFS4ERR_BAD_STATEID:
6468 case -NFS4ERR_OLD_STATEID:
6469 case -NFS4ERR_STALE_STATEID:
6470 case -NFS4ERR_EXPIRED:
6471 if (data->arg.new_lock_owner != 0) {
6472 if (nfs4_stateid_match(&data->arg.open_stateid,
6473 &lsp->ls_state->open_stateid))
6474 goto out_done;
6475 } else if (nfs4_stateid_match(&data->arg.lock_stateid,
6476 &lsp->ls_stateid))
6477 goto out_done;
6478 }
6479 if (!data->cancelled)
6480 rpc_restart_call_prepare(task);
6481 out_done:
6482 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
6483 }
6484
6485 static void nfs4_lock_release(void *calldata)
6486 {
6487 struct nfs4_lockdata *data = calldata;
6488
6489 dprintk("%s: begin!\n", __func__);
6490 nfs_free_seqid(data->arg.open_seqid);
6491 if (data->cancelled) {
6492 struct rpc_task *task;
6493 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6494 data->arg.lock_seqid);
6495 if (!IS_ERR(task))
6496 rpc_put_task_async(task);
6497 dprintk("%s: cancelling lock!\n", __func__);
6498 } else
6499 nfs_free_seqid(data->arg.lock_seqid);
6500 nfs4_put_lock_state(data->lsp);
6501 put_nfs_open_context(data->ctx);
6502 kfree(data);
6503 dprintk("%s: done!\n", __func__);
6504 }
6505
6506 static const struct rpc_call_ops nfs4_lock_ops = {
6507 .rpc_call_prepare = nfs4_lock_prepare,
6508 .rpc_call_done = nfs4_lock_done,
6509 .rpc_release = nfs4_lock_release,
6510 };
6511
6512 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6513 {
6514 switch (error) {
6515 case -NFS4ERR_ADMIN_REVOKED:
6516 case -NFS4ERR_EXPIRED:
6517 case -NFS4ERR_BAD_STATEID:
6518 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6519 if (new_lock_owner != 0 ||
6520 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6521 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6522 break;
6523 case -NFS4ERR_STALE_STATEID:
6524 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6525 nfs4_schedule_lease_recovery(server->nfs_client);
6526 };
6527 }
6528
6529 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6530 {
6531 struct nfs4_lockdata *data;
6532 struct rpc_task *task;
6533 struct rpc_message msg = {
6534 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6535 .rpc_cred = state->owner->so_cred,
6536 };
6537 struct rpc_task_setup task_setup_data = {
6538 .rpc_client = NFS_CLIENT(state->inode),
6539 .rpc_message = &msg,
6540 .callback_ops = &nfs4_lock_ops,
6541 .workqueue = nfsiod_workqueue,
6542 .flags = RPC_TASK_ASYNC,
6543 };
6544 int ret;
6545
6546 dprintk("%s: begin!\n", __func__);
6547 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6548 fl->fl_u.nfs4_fl.owner,
6549 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6550 if (data == NULL)
6551 return -ENOMEM;
6552 if (IS_SETLKW(cmd))
6553 data->arg.block = 1;
6554 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
6555 recovery_type > NFS_LOCK_NEW);
6556 msg.rpc_argp = &data->arg;
6557 msg.rpc_resp = &data->res;
6558 task_setup_data.callback_data = data;
6559 if (recovery_type > NFS_LOCK_NEW) {
6560 if (recovery_type == NFS_LOCK_RECLAIM)
6561 data->arg.reclaim = NFS_LOCK_RECLAIM;
6562 } else
6563 data->arg.new_lock = 1;
6564 task = rpc_run_task(&task_setup_data);
6565 if (IS_ERR(task))
6566 return PTR_ERR(task);
6567 ret = rpc_wait_for_completion_task(task);
6568 if (ret == 0) {
6569 ret = data->rpc_status;
6570 if (ret)
6571 nfs4_handle_setlk_error(data->server, data->lsp,
6572 data->arg.new_lock_owner, ret);
6573 } else
6574 data->cancelled = true;
6575 rpc_put_task(task);
6576 dprintk("%s: done, ret = %d!\n", __func__, ret);
6577 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
6578 return ret;
6579 }
6580
6581 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
6582 {
6583 struct nfs_server *server = NFS_SERVER(state->inode);
6584 struct nfs4_exception exception = {
6585 .inode = state->inode,
6586 };
6587 int err;
6588
6589 do {
6590 /* Cache the lock if possible... */
6591 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6592 return 0;
6593 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
6594 if (err != -NFS4ERR_DELAY)
6595 break;
6596 nfs4_handle_exception(server, err, &exception);
6597 } while (exception.retry);
6598 return err;
6599 }
6600
6601 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6602 {
6603 struct nfs_server *server = NFS_SERVER(state->inode);
6604 struct nfs4_exception exception = {
6605 .inode = state->inode,
6606 };
6607 int err;
6608
6609 err = nfs4_set_lock_state(state, request);
6610 if (err != 0)
6611 return err;
6612 if (!recover_lost_locks) {
6613 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6614 return 0;
6615 }
6616 do {
6617 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6618 return 0;
6619 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6620 switch (err) {
6621 default:
6622 goto out;
6623 case -NFS4ERR_GRACE:
6624 case -NFS4ERR_DELAY:
6625 nfs4_handle_exception(server, err, &exception);
6626 err = 0;
6627 }
6628 } while (exception.retry);
6629 out:
6630 return err;
6631 }
6632
6633 #if defined(CONFIG_NFS_V4_1)
6634 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6635 {
6636 struct nfs4_lock_state *lsp;
6637 int status;
6638
6639 status = nfs4_set_lock_state(state, request);
6640 if (status != 0)
6641 return status;
6642 lsp = request->fl_u.nfs4_fl.owner;
6643 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
6644 test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
6645 return 0;
6646 return nfs4_lock_expired(state, request);
6647 }
6648 #endif
6649
6650 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6651 {
6652 struct nfs_inode *nfsi = NFS_I(state->inode);
6653 struct nfs4_state_owner *sp = state->owner;
6654 unsigned char fl_flags = request->fl_flags;
6655 int status;
6656
6657 request->fl_flags |= FL_ACCESS;
6658 status = locks_lock_inode_wait(state->inode, request);
6659 if (status < 0)
6660 goto out;
6661 mutex_lock(&sp->so_delegreturn_mutex);
6662 down_read(&nfsi->rwsem);
6663 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6664 /* Yes: cache locks! */
6665 /* ...but avoid races with delegation recall... */
6666 request->fl_flags = fl_flags & ~FL_SLEEP;
6667 status = locks_lock_inode_wait(state->inode, request);
6668 up_read(&nfsi->rwsem);
6669 mutex_unlock(&sp->so_delegreturn_mutex);
6670 goto out;
6671 }
6672 up_read(&nfsi->rwsem);
6673 mutex_unlock(&sp->so_delegreturn_mutex);
6674 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6675 out:
6676 request->fl_flags = fl_flags;
6677 return status;
6678 }
6679
6680 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6681 {
6682 struct nfs4_exception exception = {
6683 .state = state,
6684 .inode = state->inode,
6685 };
6686 int err;
6687
6688 do {
6689 err = _nfs4_proc_setlk(state, cmd, request);
6690 if (err == -NFS4ERR_DENIED)
6691 err = -EAGAIN;
6692 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6693 err, &exception);
6694 } while (exception.retry);
6695 return err;
6696 }
6697
6698 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
6699 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
6700
6701 static int
6702 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
6703 struct file_lock *request)
6704 {
6705 int status = -ERESTARTSYS;
6706 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6707
6708 while(!signalled()) {
6709 status = nfs4_proc_setlk(state, cmd, request);
6710 if ((status != -EAGAIN) || IS_SETLK(cmd))
6711 break;
6712 freezable_schedule_timeout_interruptible(timeout);
6713 timeout *= 2;
6714 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
6715 status = -ERESTARTSYS;
6716 }
6717 return status;
6718 }
6719
6720 #ifdef CONFIG_NFS_V4_1
6721 struct nfs4_lock_waiter {
6722 struct task_struct *task;
6723 struct inode *inode;
6724 struct nfs_lowner *owner;
6725 bool notified;
6726 };
6727
6728 static int
6729 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
6730 {
6731 int ret;
6732 struct nfs4_lock_waiter *waiter = wait->private;
6733
6734 /* NULL key means to wake up everyone */
6735 if (key) {
6736 struct cb_notify_lock_args *cbnl = key;
6737 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
6738 *wowner = waiter->owner;
6739
6740 /* Only wake if the callback was for the same owner. */
6741 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
6742 return 0;
6743
6744 /* Make sure it's for the right inode */
6745 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
6746 return 0;
6747
6748 waiter->notified = true;
6749 }
6750
6751 /* override "private" so we can use default_wake_function */
6752 wait->private = waiter->task;
6753 ret = autoremove_wake_function(wait, mode, flags, key);
6754 wait->private = waiter;
6755 return ret;
6756 }
6757
6758 static int
6759 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6760 {
6761 int status = -ERESTARTSYS;
6762 unsigned long flags;
6763 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
6764 struct nfs_server *server = NFS_SERVER(state->inode);
6765 struct nfs_client *clp = server->nfs_client;
6766 wait_queue_head_t *q = &clp->cl_lock_waitq;
6767 struct nfs_lowner owner = { .clientid = clp->cl_clientid,
6768 .id = lsp->ls_seqid.owner_id,
6769 .s_dev = server->s_dev };
6770 struct nfs4_lock_waiter waiter = { .task = current,
6771 .inode = state->inode,
6772 .owner = &owner,
6773 .notified = false };
6774 wait_queue_entry_t wait;
6775
6776 /* Don't bother with waitqueue if we don't expect a callback */
6777 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
6778 return nfs4_retry_setlk_simple(state, cmd, request);
6779
6780 init_wait(&wait);
6781 wait.private = &waiter;
6782 wait.func = nfs4_wake_lock_waiter;
6783 add_wait_queue(q, &wait);
6784
6785 while(!signalled()) {
6786 waiter.notified = false;
6787 status = nfs4_proc_setlk(state, cmd, request);
6788 if ((status != -EAGAIN) || IS_SETLK(cmd))
6789 break;
6790
6791 status = -ERESTARTSYS;
6792 spin_lock_irqsave(&q->lock, flags);
6793 if (waiter.notified) {
6794 spin_unlock_irqrestore(&q->lock, flags);
6795 continue;
6796 }
6797 set_current_state(TASK_INTERRUPTIBLE);
6798 spin_unlock_irqrestore(&q->lock, flags);
6799
6800 freezable_schedule_timeout(NFS4_LOCK_MAXTIMEOUT);
6801 }
6802
6803 finish_wait(q, &wait);
6804 return status;
6805 }
6806 #else /* !CONFIG_NFS_V4_1 */
6807 static inline int
6808 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6809 {
6810 return nfs4_retry_setlk_simple(state, cmd, request);
6811 }
6812 #endif
6813
6814 static int
6815 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6816 {
6817 struct nfs_open_context *ctx;
6818 struct nfs4_state *state;
6819 int status;
6820
6821 /* verify open state */
6822 ctx = nfs_file_open_context(filp);
6823 state = ctx->state;
6824
6825 if (IS_GETLK(cmd)) {
6826 if (state != NULL)
6827 return nfs4_proc_getlk(state, F_GETLK, request);
6828 return 0;
6829 }
6830
6831 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6832 return -EINVAL;
6833
6834 if (request->fl_type == F_UNLCK) {
6835 if (state != NULL)
6836 return nfs4_proc_unlck(state, cmd, request);
6837 return 0;
6838 }
6839
6840 if (state == NULL)
6841 return -ENOLCK;
6842
6843 if ((request->fl_flags & FL_POSIX) &&
6844 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6845 return -ENOLCK;
6846
6847 /*
6848 * Don't rely on the VFS having checked the file open mode,
6849 * since it won't do this for flock() locks.
6850 */
6851 switch (request->fl_type) {
6852 case F_RDLCK:
6853 if (!(filp->f_mode & FMODE_READ))
6854 return -EBADF;
6855 break;
6856 case F_WRLCK:
6857 if (!(filp->f_mode & FMODE_WRITE))
6858 return -EBADF;
6859 }
6860
6861 status = nfs4_set_lock_state(state, request);
6862 if (status != 0)
6863 return status;
6864
6865 return nfs4_retry_setlk(state, cmd, request);
6866 }
6867
6868 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6869 {
6870 struct nfs_server *server = NFS_SERVER(state->inode);
6871 int err;
6872
6873 err = nfs4_set_lock_state(state, fl);
6874 if (err != 0)
6875 return err;
6876 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6877 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
6878 }
6879
6880 struct nfs_release_lockowner_data {
6881 struct nfs4_lock_state *lsp;
6882 struct nfs_server *server;
6883 struct nfs_release_lockowner_args args;
6884 struct nfs_release_lockowner_res res;
6885 unsigned long timestamp;
6886 };
6887
6888 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6889 {
6890 struct nfs_release_lockowner_data *data = calldata;
6891 struct nfs_server *server = data->server;
6892 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
6893 &data->res.seq_res, task);
6894 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6895 data->timestamp = jiffies;
6896 }
6897
6898 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6899 {
6900 struct nfs_release_lockowner_data *data = calldata;
6901 struct nfs_server *server = data->server;
6902
6903 nfs40_sequence_done(task, &data->res.seq_res);
6904
6905 switch (task->tk_status) {
6906 case 0:
6907 renew_lease(server, data->timestamp);
6908 break;
6909 case -NFS4ERR_STALE_CLIENTID:
6910 case -NFS4ERR_EXPIRED:
6911 nfs4_schedule_lease_recovery(server->nfs_client);
6912 break;
6913 case -NFS4ERR_LEASE_MOVED:
6914 case -NFS4ERR_DELAY:
6915 if (nfs4_async_handle_error(task, server,
6916 NULL, NULL) == -EAGAIN)
6917 rpc_restart_call_prepare(task);
6918 }
6919 }
6920
6921 static void nfs4_release_lockowner_release(void *calldata)
6922 {
6923 struct nfs_release_lockowner_data *data = calldata;
6924 nfs4_free_lock_state(data->server, data->lsp);
6925 kfree(calldata);
6926 }
6927
6928 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6929 .rpc_call_prepare = nfs4_release_lockowner_prepare,
6930 .rpc_call_done = nfs4_release_lockowner_done,
6931 .rpc_release = nfs4_release_lockowner_release,
6932 };
6933
6934 static void
6935 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6936 {
6937 struct nfs_release_lockowner_data *data;
6938 struct rpc_message msg = {
6939 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6940 };
6941
6942 if (server->nfs_client->cl_mvops->minor_version != 0)
6943 return;
6944
6945 data = kmalloc(sizeof(*data), GFP_NOFS);
6946 if (!data)
6947 return;
6948 data->lsp = lsp;
6949 data->server = server;
6950 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6951 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6952 data->args.lock_owner.s_dev = server->s_dev;
6953
6954 msg.rpc_argp = &data->args;
6955 msg.rpc_resp = &data->res;
6956 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
6957 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6958 }
6959
6960 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6961
6962 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6963 struct dentry *unused, struct inode *inode,
6964 const char *key, const void *buf,
6965 size_t buflen, int flags)
6966 {
6967 return nfs4_proc_set_acl(inode, buf, buflen);
6968 }
6969
6970 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6971 struct dentry *unused, struct inode *inode,
6972 const char *key, void *buf, size_t buflen)
6973 {
6974 return nfs4_proc_get_acl(inode, buf, buflen);
6975 }
6976
6977 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6978 {
6979 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6980 }
6981
6982 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6983
6984 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6985 struct dentry *unused, struct inode *inode,
6986 const char *key, const void *buf,
6987 size_t buflen, int flags)
6988 {
6989 if (security_ismaclabel(key))
6990 return nfs4_set_security_label(inode, buf, buflen);
6991
6992 return -EOPNOTSUPP;
6993 }
6994
6995 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6996 struct dentry *unused, struct inode *inode,
6997 const char *key, void *buf, size_t buflen)
6998 {
6999 if (security_ismaclabel(key))
7000 return nfs4_get_security_label(inode, buf, buflen);
7001 return -EOPNOTSUPP;
7002 }
7003
7004 static ssize_t
7005 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7006 {
7007 int len = 0;
7008
7009 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7010 len = security_inode_listsecurity(inode, list, list_len);
7011 if (list_len && len > list_len)
7012 return -ERANGE;
7013 }
7014 return len;
7015 }
7016
7017 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7018 .prefix = XATTR_SECURITY_PREFIX,
7019 .get = nfs4_xattr_get_nfs4_label,
7020 .set = nfs4_xattr_set_nfs4_label,
7021 };
7022
7023 #else
7024
7025 static ssize_t
7026 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7027 {
7028 return 0;
7029 }
7030
7031 #endif
7032
7033 /*
7034 * nfs_fhget will use either the mounted_on_fileid or the fileid
7035 */
7036 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7037 {
7038 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7039 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7040 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7041 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7042 return;
7043
7044 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7045 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7046 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7047 fattr->nlink = 2;
7048 }
7049
7050 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7051 const struct qstr *name,
7052 struct nfs4_fs_locations *fs_locations,
7053 struct page *page)
7054 {
7055 struct nfs_server *server = NFS_SERVER(dir);
7056 u32 bitmask[3];
7057 struct nfs4_fs_locations_arg args = {
7058 .dir_fh = NFS_FH(dir),
7059 .name = name,
7060 .page = page,
7061 .bitmask = bitmask,
7062 };
7063 struct nfs4_fs_locations_res res = {
7064 .fs_locations = fs_locations,
7065 };
7066 struct rpc_message msg = {
7067 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7068 .rpc_argp = &args,
7069 .rpc_resp = &res,
7070 };
7071 int status;
7072
7073 dprintk("%s: start\n", __func__);
7074
7075 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7076 bitmask[1] = nfs4_fattr_bitmap[1];
7077
7078 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7079 * is not supported */
7080 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7081 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7082 else
7083 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7084
7085 nfs_fattr_init(&fs_locations->fattr);
7086 fs_locations->server = server;
7087 fs_locations->nlocations = 0;
7088 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7089 dprintk("%s: returned status = %d\n", __func__, status);
7090 return status;
7091 }
7092
7093 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7094 const struct qstr *name,
7095 struct nfs4_fs_locations *fs_locations,
7096 struct page *page)
7097 {
7098 struct nfs4_exception exception = { };
7099 int err;
7100 do {
7101 err = _nfs4_proc_fs_locations(client, dir, name,
7102 fs_locations, page);
7103 trace_nfs4_get_fs_locations(dir, name, err);
7104 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7105 &exception);
7106 } while (exception.retry);
7107 return err;
7108 }
7109
7110 /*
7111 * This operation also signals the server that this client is
7112 * performing migration recovery. The server can stop returning
7113 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
7114 * appended to this compound to identify the client ID which is
7115 * performing recovery.
7116 */
7117 static int _nfs40_proc_get_locations(struct inode *inode,
7118 struct nfs4_fs_locations *locations,
7119 struct page *page, struct rpc_cred *cred)
7120 {
7121 struct nfs_server *server = NFS_SERVER(inode);
7122 struct rpc_clnt *clnt = server->client;
7123 u32 bitmask[2] = {
7124 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7125 };
7126 struct nfs4_fs_locations_arg args = {
7127 .clientid = server->nfs_client->cl_clientid,
7128 .fh = NFS_FH(inode),
7129 .page = page,
7130 .bitmask = bitmask,
7131 .migration = 1, /* skip LOOKUP */
7132 .renew = 1, /* append RENEW */
7133 };
7134 struct nfs4_fs_locations_res res = {
7135 .fs_locations = locations,
7136 .migration = 1,
7137 .renew = 1,
7138 };
7139 struct rpc_message msg = {
7140 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7141 .rpc_argp = &args,
7142 .rpc_resp = &res,
7143 .rpc_cred = cred,
7144 };
7145 unsigned long now = jiffies;
7146 int status;
7147
7148 nfs_fattr_init(&locations->fattr);
7149 locations->server = server;
7150 locations->nlocations = 0;
7151
7152 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7153 status = nfs4_call_sync_sequence(clnt, server, &msg,
7154 &args.seq_args, &res.seq_res);
7155 if (status)
7156 return status;
7157
7158 renew_lease(server, now);
7159 return 0;
7160 }
7161
7162 #ifdef CONFIG_NFS_V4_1
7163
7164 /*
7165 * This operation also signals the server that this client is
7166 * performing migration recovery. The server can stop asserting
7167 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
7168 * performing this operation is identified in the SEQUENCE
7169 * operation in this compound.
7170 *
7171 * When the client supports GETATTR(fs_locations_info), it can
7172 * be plumbed in here.
7173 */
7174 static int _nfs41_proc_get_locations(struct inode *inode,
7175 struct nfs4_fs_locations *locations,
7176 struct page *page, struct rpc_cred *cred)
7177 {
7178 struct nfs_server *server = NFS_SERVER(inode);
7179 struct rpc_clnt *clnt = server->client;
7180 u32 bitmask[2] = {
7181 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7182 };
7183 struct nfs4_fs_locations_arg args = {
7184 .fh = NFS_FH(inode),
7185 .page = page,
7186 .bitmask = bitmask,
7187 .migration = 1, /* skip LOOKUP */
7188 };
7189 struct nfs4_fs_locations_res res = {
7190 .fs_locations = locations,
7191 .migration = 1,
7192 };
7193 struct rpc_message msg = {
7194 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7195 .rpc_argp = &args,
7196 .rpc_resp = &res,
7197 .rpc_cred = cred,
7198 };
7199 int status;
7200
7201 nfs_fattr_init(&locations->fattr);
7202 locations->server = server;
7203 locations->nlocations = 0;
7204
7205 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7206 status = nfs4_call_sync_sequence(clnt, server, &msg,
7207 &args.seq_args, &res.seq_res);
7208 if (status == NFS4_OK &&
7209 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7210 status = -NFS4ERR_LEASE_MOVED;
7211 return status;
7212 }
7213
7214 #endif /* CONFIG_NFS_V4_1 */
7215
7216 /**
7217 * nfs4_proc_get_locations - discover locations for a migrated FSID
7218 * @inode: inode on FSID that is migrating
7219 * @locations: result of query
7220 * @page: buffer
7221 * @cred: credential to use for this operation
7222 *
7223 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
7224 * operation failed, or a negative errno if a local error occurred.
7225 *
7226 * On success, "locations" is filled in, but if the server has
7227 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
7228 * asserted.
7229 *
7230 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
7231 * from this client that require migration recovery.
7232 */
7233 int nfs4_proc_get_locations(struct inode *inode,
7234 struct nfs4_fs_locations *locations,
7235 struct page *page, struct rpc_cred *cred)
7236 {
7237 struct nfs_server *server = NFS_SERVER(inode);
7238 struct nfs_client *clp = server->nfs_client;
7239 const struct nfs4_mig_recovery_ops *ops =
7240 clp->cl_mvops->mig_recovery_ops;
7241 struct nfs4_exception exception = { };
7242 int status;
7243
7244 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7245 (unsigned long long)server->fsid.major,
7246 (unsigned long long)server->fsid.minor,
7247 clp->cl_hostname);
7248 nfs_display_fhandle(NFS_FH(inode), __func__);
7249
7250 do {
7251 status = ops->get_locations(inode, locations, page, cred);
7252 if (status != -NFS4ERR_DELAY)
7253 break;
7254 nfs4_handle_exception(server, status, &exception);
7255 } while (exception.retry);
7256 return status;
7257 }
7258
7259 /*
7260 * This operation also signals the server that this client is
7261 * performing "lease moved" recovery. The server can stop
7262 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
7263 * is appended to this compound to identify the client ID which is
7264 * performing recovery.
7265 */
7266 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
7267 {
7268 struct nfs_server *server = NFS_SERVER(inode);
7269 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7270 struct rpc_clnt *clnt = server->client;
7271 struct nfs4_fsid_present_arg args = {
7272 .fh = NFS_FH(inode),
7273 .clientid = clp->cl_clientid,
7274 .renew = 1, /* append RENEW */
7275 };
7276 struct nfs4_fsid_present_res res = {
7277 .renew = 1,
7278 };
7279 struct rpc_message msg = {
7280 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7281 .rpc_argp = &args,
7282 .rpc_resp = &res,
7283 .rpc_cred = cred,
7284 };
7285 unsigned long now = jiffies;
7286 int status;
7287
7288 res.fh = nfs_alloc_fhandle();
7289 if (res.fh == NULL)
7290 return -ENOMEM;
7291
7292 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7293 status = nfs4_call_sync_sequence(clnt, server, &msg,
7294 &args.seq_args, &res.seq_res);
7295 nfs_free_fhandle(res.fh);
7296 if (status)
7297 return status;
7298
7299 do_renew_lease(clp, now);
7300 return 0;
7301 }
7302
7303 #ifdef CONFIG_NFS_V4_1
7304
7305 /*
7306 * This operation also signals the server that this client is
7307 * performing "lease moved" recovery. The server can stop asserting
7308 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
7309 * this operation is identified in the SEQUENCE operation in this
7310 * compound.
7311 */
7312 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
7313 {
7314 struct nfs_server *server = NFS_SERVER(inode);
7315 struct rpc_clnt *clnt = server->client;
7316 struct nfs4_fsid_present_arg args = {
7317 .fh = NFS_FH(inode),
7318 };
7319 struct nfs4_fsid_present_res res = {
7320 };
7321 struct rpc_message msg = {
7322 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7323 .rpc_argp = &args,
7324 .rpc_resp = &res,
7325 .rpc_cred = cred,
7326 };
7327 int status;
7328
7329 res.fh = nfs_alloc_fhandle();
7330 if (res.fh == NULL)
7331 return -ENOMEM;
7332
7333 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7334 status = nfs4_call_sync_sequence(clnt, server, &msg,
7335 &args.seq_args, &res.seq_res);
7336 nfs_free_fhandle(res.fh);
7337 if (status == NFS4_OK &&
7338 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7339 status = -NFS4ERR_LEASE_MOVED;
7340 return status;
7341 }
7342
7343 #endif /* CONFIG_NFS_V4_1 */
7344
7345 /**
7346 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
7347 * @inode: inode on FSID to check
7348 * @cred: credential to use for this operation
7349 *
7350 * Server indicates whether the FSID is present, moved, or not
7351 * recognized. This operation is necessary to clear a LEASE_MOVED
7352 * condition for this client ID.
7353 *
7354 * Returns NFS4_OK if the FSID is present on this server,
7355 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
7356 * NFS4ERR code if some error occurred on the server, or a
7357 * negative errno if a local failure occurred.
7358 */
7359 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
7360 {
7361 struct nfs_server *server = NFS_SERVER(inode);
7362 struct nfs_client *clp = server->nfs_client;
7363 const struct nfs4_mig_recovery_ops *ops =
7364 clp->cl_mvops->mig_recovery_ops;
7365 struct nfs4_exception exception = { };
7366 int status;
7367
7368 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7369 (unsigned long long)server->fsid.major,
7370 (unsigned long long)server->fsid.minor,
7371 clp->cl_hostname);
7372 nfs_display_fhandle(NFS_FH(inode), __func__);
7373
7374 do {
7375 status = ops->fsid_present(inode, cred);
7376 if (status != -NFS4ERR_DELAY)
7377 break;
7378 nfs4_handle_exception(server, status, &exception);
7379 } while (exception.retry);
7380 return status;
7381 }
7382
7383 /**
7384 * If 'use_integrity' is true and the state managment nfs_client
7385 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
7386 * and the machine credential as per RFC3530bis and RFC5661 Security
7387 * Considerations sections. Otherwise, just use the user cred with the
7388 * filesystem's rpc_client.
7389 */
7390 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7391 {
7392 int status;
7393 struct nfs4_secinfo_arg args = {
7394 .dir_fh = NFS_FH(dir),
7395 .name = name,
7396 };
7397 struct nfs4_secinfo_res res = {
7398 .flavors = flavors,
7399 };
7400 struct rpc_message msg = {
7401 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
7402 .rpc_argp = &args,
7403 .rpc_resp = &res,
7404 };
7405 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
7406 struct rpc_cred *cred = NULL;
7407
7408 if (use_integrity) {
7409 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
7410 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
7411 msg.rpc_cred = cred;
7412 }
7413
7414 dprintk("NFS call secinfo %s\n", name->name);
7415
7416 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
7417 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
7418
7419 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
7420 &res.seq_res, 0);
7421 dprintk("NFS reply secinfo: %d\n", status);
7422
7423 if (cred)
7424 put_rpccred(cred);
7425
7426 return status;
7427 }
7428
7429 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
7430 struct nfs4_secinfo_flavors *flavors)
7431 {
7432 struct nfs4_exception exception = { };
7433 int err;
7434 do {
7435 err = -NFS4ERR_WRONGSEC;
7436
7437 /* try to use integrity protection with machine cred */
7438 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
7439 err = _nfs4_proc_secinfo(dir, name, flavors, true);
7440
7441 /*
7442 * if unable to use integrity protection, or SECINFO with
7443 * integrity protection returns NFS4ERR_WRONGSEC (which is
7444 * disallowed by spec, but exists in deployed servers) use
7445 * the current filesystem's rpc_client and the user cred.
7446 */
7447 if (err == -NFS4ERR_WRONGSEC)
7448 err = _nfs4_proc_secinfo(dir, name, flavors, false);
7449
7450 trace_nfs4_secinfo(dir, name, err);
7451 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7452 &exception);
7453 } while (exception.retry);
7454 return err;
7455 }
7456
7457 #ifdef CONFIG_NFS_V4_1
7458 /*
7459 * Check the exchange flags returned by the server for invalid flags, having
7460 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
7461 * DS flags set.
7462 */
7463 static int nfs4_check_cl_exchange_flags(u32 flags)
7464 {
7465 if (flags & ~EXCHGID4_FLAG_MASK_R)
7466 goto out_inval;
7467 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
7468 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
7469 goto out_inval;
7470 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
7471 goto out_inval;
7472 return NFS_OK;
7473 out_inval:
7474 return -NFS4ERR_INVAL;
7475 }
7476
7477 static bool
7478 nfs41_same_server_scope(struct nfs41_server_scope *a,
7479 struct nfs41_server_scope *b)
7480 {
7481 if (a->server_scope_sz != b->server_scope_sz)
7482 return false;
7483 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
7484 }
7485
7486 static void
7487 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
7488 {
7489 }
7490
7491 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
7492 .rpc_call_done = &nfs4_bind_one_conn_to_session_done,
7493 };
7494
7495 /*
7496 * nfs4_proc_bind_one_conn_to_session()
7497 *
7498 * The 4.1 client currently uses the same TCP connection for the
7499 * fore and backchannel.
7500 */
7501 static
7502 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
7503 struct rpc_xprt *xprt,
7504 struct nfs_client *clp,
7505 struct rpc_cred *cred)
7506 {
7507 int status;
7508 struct nfs41_bind_conn_to_session_args args = {
7509 .client = clp,
7510 .dir = NFS4_CDFC4_FORE_OR_BOTH,
7511 };
7512 struct nfs41_bind_conn_to_session_res res;
7513 struct rpc_message msg = {
7514 .rpc_proc =
7515 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
7516 .rpc_argp = &args,
7517 .rpc_resp = &res,
7518 .rpc_cred = cred,
7519 };
7520 struct rpc_task_setup task_setup_data = {
7521 .rpc_client = clnt,
7522 .rpc_xprt = xprt,
7523 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
7524 .rpc_message = &msg,
7525 .flags = RPC_TASK_TIMEOUT,
7526 };
7527 struct rpc_task *task;
7528
7529 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
7530 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
7531 args.dir = NFS4_CDFC4_FORE;
7532
7533 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
7534 if (xprt != rcu_access_pointer(clnt->cl_xprt))
7535 args.dir = NFS4_CDFC4_FORE;
7536
7537 task = rpc_run_task(&task_setup_data);
7538 if (!IS_ERR(task)) {
7539 status = task->tk_status;
7540 rpc_put_task(task);
7541 } else
7542 status = PTR_ERR(task);
7543 trace_nfs4_bind_conn_to_session(clp, status);
7544 if (status == 0) {
7545 if (memcmp(res.sessionid.data,
7546 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
7547 dprintk("NFS: %s: Session ID mismatch\n", __func__);
7548 return -EIO;
7549 }
7550 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
7551 dprintk("NFS: %s: Unexpected direction from server\n",
7552 __func__);
7553 return -EIO;
7554 }
7555 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
7556 dprintk("NFS: %s: Server returned RDMA mode = true\n",
7557 __func__);
7558 return -EIO;
7559 }
7560 }
7561
7562 return status;
7563 }
7564
7565 struct rpc_bind_conn_calldata {
7566 struct nfs_client *clp;
7567 struct rpc_cred *cred;
7568 };
7569
7570 static int
7571 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
7572 struct rpc_xprt *xprt,
7573 void *calldata)
7574 {
7575 struct rpc_bind_conn_calldata *p = calldata;
7576
7577 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
7578 }
7579
7580 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
7581 {
7582 struct rpc_bind_conn_calldata data = {
7583 .clp = clp,
7584 .cred = cred,
7585 };
7586 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
7587 nfs4_proc_bind_conn_to_session_callback, &data);
7588 }
7589
7590 /*
7591 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
7592 * and operations we'd like to see to enable certain features in the allow map
7593 */
7594 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
7595 .how = SP4_MACH_CRED,
7596 .enforce.u.words = {
7597 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7598 1 << (OP_EXCHANGE_ID - 32) |
7599 1 << (OP_CREATE_SESSION - 32) |
7600 1 << (OP_DESTROY_SESSION - 32) |
7601 1 << (OP_DESTROY_CLIENTID - 32)
7602 },
7603 .allow.u.words = {
7604 [0] = 1 << (OP_CLOSE) |
7605 1 << (OP_OPEN_DOWNGRADE) |
7606 1 << (OP_LOCKU) |
7607 1 << (OP_DELEGRETURN) |
7608 1 << (OP_COMMIT),
7609 [1] = 1 << (OP_SECINFO - 32) |
7610 1 << (OP_SECINFO_NO_NAME - 32) |
7611 1 << (OP_LAYOUTRETURN - 32) |
7612 1 << (OP_TEST_STATEID - 32) |
7613 1 << (OP_FREE_STATEID - 32) |
7614 1 << (OP_WRITE - 32)
7615 }
7616 };
7617
7618 /*
7619 * Select the state protection mode for client `clp' given the server results
7620 * from exchange_id in `sp'.
7621 *
7622 * Returns 0 on success, negative errno otherwise.
7623 */
7624 static int nfs4_sp4_select_mode(struct nfs_client *clp,
7625 struct nfs41_state_protection *sp)
7626 {
7627 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
7628 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7629 1 << (OP_EXCHANGE_ID - 32) |
7630 1 << (OP_CREATE_SESSION - 32) |
7631 1 << (OP_DESTROY_SESSION - 32) |
7632 1 << (OP_DESTROY_CLIENTID - 32)
7633 };
7634 unsigned long flags = 0;
7635 unsigned int i;
7636 int ret = 0;
7637
7638 if (sp->how == SP4_MACH_CRED) {
7639 /* Print state protect result */
7640 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
7641 for (i = 0; i <= LAST_NFS4_OP; i++) {
7642 if (test_bit(i, sp->enforce.u.longs))
7643 dfprintk(MOUNT, " enforce op %d\n", i);
7644 if (test_bit(i, sp->allow.u.longs))
7645 dfprintk(MOUNT, " allow op %d\n", i);
7646 }
7647
7648 /* make sure nothing is on enforce list that isn't supported */
7649 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
7650 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
7651 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7652 ret = -EINVAL;
7653 goto out;
7654 }
7655 }
7656
7657 /*
7658 * Minimal mode - state operations are allowed to use machine
7659 * credential. Note this already happens by default, so the
7660 * client doesn't have to do anything more than the negotiation.
7661 *
7662 * NOTE: we don't care if EXCHANGE_ID is in the list -
7663 * we're already using the machine cred for exchange_id
7664 * and will never use a different cred.
7665 */
7666 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
7667 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
7668 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
7669 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
7670 dfprintk(MOUNT, "sp4_mach_cred:\n");
7671 dfprintk(MOUNT, " minimal mode enabled\n");
7672 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
7673 } else {
7674 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7675 ret = -EINVAL;
7676 goto out;
7677 }
7678
7679 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7680 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7681 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7682 test_bit(OP_LOCKU, sp->allow.u.longs)) {
7683 dfprintk(MOUNT, " cleanup mode enabled\n");
7684 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
7685 }
7686
7687 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7688 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
7689 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
7690 }
7691
7692 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7693 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7694 dfprintk(MOUNT, " secinfo mode enabled\n");
7695 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
7696 }
7697
7698 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7699 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7700 dfprintk(MOUNT, " stateid mode enabled\n");
7701 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
7702 }
7703
7704 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7705 dfprintk(MOUNT, " write mode enabled\n");
7706 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
7707 }
7708
7709 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7710 dfprintk(MOUNT, " commit mode enabled\n");
7711 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
7712 }
7713 }
7714 out:
7715 clp->cl_sp4_flags = flags;
7716 return 0;
7717 }
7718
7719 struct nfs41_exchange_id_data {
7720 struct nfs41_exchange_id_res res;
7721 struct nfs41_exchange_id_args args;
7722 };
7723
7724 static void nfs4_exchange_id_release(void *data)
7725 {
7726 struct nfs41_exchange_id_data *cdata =
7727 (struct nfs41_exchange_id_data *)data;
7728
7729 nfs_put_client(cdata->args.client);
7730 kfree(cdata->res.impl_id);
7731 kfree(cdata->res.server_scope);
7732 kfree(cdata->res.server_owner);
7733 kfree(cdata);
7734 }
7735
7736 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
7737 .rpc_release = nfs4_exchange_id_release,
7738 };
7739
7740 /*
7741 * _nfs4_proc_exchange_id()
7742 *
7743 * Wrapper for EXCHANGE_ID operation.
7744 */
7745 static struct rpc_task *
7746 nfs4_run_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7747 u32 sp4_how, struct rpc_xprt *xprt)
7748 {
7749 struct rpc_message msg = {
7750 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7751 .rpc_cred = cred,
7752 };
7753 struct rpc_task_setup task_setup_data = {
7754 .rpc_client = clp->cl_rpcclient,
7755 .callback_ops = &nfs4_exchange_id_call_ops,
7756 .rpc_message = &msg,
7757 .flags = RPC_TASK_TIMEOUT,
7758 };
7759 struct nfs41_exchange_id_data *calldata;
7760 int status;
7761
7762 if (!refcount_inc_not_zero(&clp->cl_count))
7763 return ERR_PTR(-EIO);
7764
7765 status = -ENOMEM;
7766 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7767 if (!calldata)
7768 goto out;
7769
7770 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
7771
7772 status = nfs4_init_uniform_client_string(clp);
7773 if (status)
7774 goto out_calldata;
7775
7776 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
7777 GFP_NOFS);
7778 status = -ENOMEM;
7779 if (unlikely(calldata->res.server_owner == NULL))
7780 goto out_calldata;
7781
7782 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7783 GFP_NOFS);
7784 if (unlikely(calldata->res.server_scope == NULL))
7785 goto out_server_owner;
7786
7787 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7788 if (unlikely(calldata->res.impl_id == NULL))
7789 goto out_server_scope;
7790
7791 switch (sp4_how) {
7792 case SP4_NONE:
7793 calldata->args.state_protect.how = SP4_NONE;
7794 break;
7795
7796 case SP4_MACH_CRED:
7797 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
7798 break;
7799
7800 default:
7801 /* unsupported! */
7802 WARN_ON_ONCE(1);
7803 status = -EINVAL;
7804 goto out_impl_id;
7805 }
7806 if (xprt) {
7807 task_setup_data.rpc_xprt = xprt;
7808 task_setup_data.flags |= RPC_TASK_SOFTCONN;
7809 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
7810 sizeof(calldata->args.verifier.data));
7811 }
7812 calldata->args.client = clp;
7813 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7814 EXCHGID4_FLAG_BIND_PRINC_STATEID;
7815 #ifdef CONFIG_NFS_V4_1_MIGRATION
7816 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
7817 #endif
7818 msg.rpc_argp = &calldata->args;
7819 msg.rpc_resp = &calldata->res;
7820 task_setup_data.callback_data = calldata;
7821
7822 return rpc_run_task(&task_setup_data);
7823
7824 out_impl_id:
7825 kfree(calldata->res.impl_id);
7826 out_server_scope:
7827 kfree(calldata->res.server_scope);
7828 out_server_owner:
7829 kfree(calldata->res.server_owner);
7830 out_calldata:
7831 kfree(calldata);
7832 out:
7833 nfs_put_client(clp);
7834 return ERR_PTR(status);
7835 }
7836
7837 /*
7838 * _nfs4_proc_exchange_id()
7839 *
7840 * Wrapper for EXCHANGE_ID operation.
7841 */
7842 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7843 u32 sp4_how)
7844 {
7845 struct rpc_task *task;
7846 struct nfs41_exchange_id_args *argp;
7847 struct nfs41_exchange_id_res *resp;
7848 int status;
7849
7850 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
7851 if (IS_ERR(task))
7852 return PTR_ERR(task);
7853
7854 argp = task->tk_msg.rpc_argp;
7855 resp = task->tk_msg.rpc_resp;
7856 status = task->tk_status;
7857 if (status != 0)
7858 goto out;
7859
7860 status = nfs4_check_cl_exchange_flags(resp->flags);
7861 if (status != 0)
7862 goto out;
7863
7864 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
7865 if (status != 0)
7866 goto out;
7867
7868 clp->cl_clientid = resp->clientid;
7869 clp->cl_exchange_flags = resp->flags;
7870 clp->cl_seqid = resp->seqid;
7871 /* Client ID is not confirmed */
7872 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
7873 clear_bit(NFS4_SESSION_ESTABLISHED,
7874 &clp->cl_session->session_state);
7875
7876 if (clp->cl_serverscope != NULL &&
7877 !nfs41_same_server_scope(clp->cl_serverscope,
7878 resp->server_scope)) {
7879 dprintk("%s: server_scope mismatch detected\n",
7880 __func__);
7881 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7882 }
7883
7884 swap(clp->cl_serverowner, resp->server_owner);
7885 swap(clp->cl_serverscope, resp->server_scope);
7886 swap(clp->cl_implid, resp->impl_id);
7887
7888 /* Save the EXCHANGE_ID verifier session trunk tests */
7889 memcpy(clp->cl_confirm.data, argp->verifier.data,
7890 sizeof(clp->cl_confirm.data));
7891 out:
7892 trace_nfs4_exchange_id(clp, status);
7893 rpc_put_task(task);
7894 return status;
7895 }
7896
7897 /*
7898 * nfs4_proc_exchange_id()
7899 *
7900 * Returns zero, a negative errno, or a negative NFS4ERR status code.
7901 *
7902 * Since the clientid has expired, all compounds using sessions
7903 * associated with the stale clientid will be returning
7904 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7905 * be in some phase of session reset.
7906 *
7907 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7908 */
7909 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7910 {
7911 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7912 int status;
7913
7914 /* try SP4_MACH_CRED if krb5i/p */
7915 if (authflavor == RPC_AUTH_GSS_KRB5I ||
7916 authflavor == RPC_AUTH_GSS_KRB5P) {
7917 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
7918 if (!status)
7919 return 0;
7920 }
7921
7922 /* try SP4_NONE */
7923 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
7924 }
7925
7926 /**
7927 * nfs4_test_session_trunk
7928 *
7929 * This is an add_xprt_test() test function called from
7930 * rpc_clnt_setup_test_and_add_xprt.
7931 *
7932 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
7933 * and is dereferrenced in nfs4_exchange_id_release
7934 *
7935 * Upon success, add the new transport to the rpc_clnt
7936 *
7937 * @clnt: struct rpc_clnt to get new transport
7938 * @xprt: the rpc_xprt to test
7939 * @data: call data for _nfs4_proc_exchange_id.
7940 */
7941 int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
7942 void *data)
7943 {
7944 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
7945 struct rpc_task *task;
7946 int status;
7947
7948 u32 sp4_how;
7949
7950 dprintk("--> %s try %s\n", __func__,
7951 xprt->address_strings[RPC_DISPLAY_ADDR]);
7952
7953 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
7954
7955 /* Test connection for session trunking. Async exchange_id call */
7956 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
7957 if (IS_ERR(task))
7958 return PTR_ERR(task);
7959
7960 status = task->tk_status;
7961 if (status == 0)
7962 status = nfs4_detect_session_trunking(adata->clp,
7963 task->tk_msg.rpc_resp, xprt);
7964
7965 rpc_put_task(task);
7966 return status;
7967 }
7968 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
7969
7970 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7971 struct rpc_cred *cred)
7972 {
7973 struct rpc_message msg = {
7974 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7975 .rpc_argp = clp,
7976 .rpc_cred = cred,
7977 };
7978 int status;
7979
7980 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7981 trace_nfs4_destroy_clientid(clp, status);
7982 if (status)
7983 dprintk("NFS: Got error %d from the server %s on "
7984 "DESTROY_CLIENTID.", status, clp->cl_hostname);
7985 return status;
7986 }
7987
7988 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7989 struct rpc_cred *cred)
7990 {
7991 unsigned int loop;
7992 int ret;
7993
7994 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7995 ret = _nfs4_proc_destroy_clientid(clp, cred);
7996 switch (ret) {
7997 case -NFS4ERR_DELAY:
7998 case -NFS4ERR_CLIENTID_BUSY:
7999 ssleep(1);
8000 break;
8001 default:
8002 return ret;
8003 }
8004 }
8005 return 0;
8006 }
8007
8008 int nfs4_destroy_clientid(struct nfs_client *clp)
8009 {
8010 struct rpc_cred *cred;
8011 int ret = 0;
8012
8013 if (clp->cl_mvops->minor_version < 1)
8014 goto out;
8015 if (clp->cl_exchange_flags == 0)
8016 goto out;
8017 if (clp->cl_preserve_clid)
8018 goto out;
8019 cred = nfs4_get_clid_cred(clp);
8020 ret = nfs4_proc_destroy_clientid(clp, cred);
8021 if (cred)
8022 put_rpccred(cred);
8023 switch (ret) {
8024 case 0:
8025 case -NFS4ERR_STALE_CLIENTID:
8026 clp->cl_exchange_flags = 0;
8027 }
8028 out:
8029 return ret;
8030 }
8031
8032 struct nfs4_get_lease_time_data {
8033 struct nfs4_get_lease_time_args *args;
8034 struct nfs4_get_lease_time_res *res;
8035 struct nfs_client *clp;
8036 };
8037
8038 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
8039 void *calldata)
8040 {
8041 struct nfs4_get_lease_time_data *data =
8042 (struct nfs4_get_lease_time_data *)calldata;
8043
8044 dprintk("--> %s\n", __func__);
8045 /* just setup sequence, do not trigger session recovery
8046 since we're invoked within one */
8047 nfs4_setup_sequence(data->clp,
8048 &data->args->la_seq_args,
8049 &data->res->lr_seq_res,
8050 task);
8051 dprintk("<-- %s\n", __func__);
8052 }
8053
8054 /*
8055 * Called from nfs4_state_manager thread for session setup, so don't recover
8056 * from sequence operation or clientid errors.
8057 */
8058 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
8059 {
8060 struct nfs4_get_lease_time_data *data =
8061 (struct nfs4_get_lease_time_data *)calldata;
8062
8063 dprintk("--> %s\n", __func__);
8064 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
8065 return;
8066 switch (task->tk_status) {
8067 case -NFS4ERR_DELAY:
8068 case -NFS4ERR_GRACE:
8069 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
8070 rpc_delay(task, NFS4_POLL_RETRY_MIN);
8071 task->tk_status = 0;
8072 /* fall through */
8073 case -NFS4ERR_RETRY_UNCACHED_REP:
8074 rpc_restart_call_prepare(task);
8075 return;
8076 }
8077 dprintk("<-- %s\n", __func__);
8078 }
8079
8080 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
8081 .rpc_call_prepare = nfs4_get_lease_time_prepare,
8082 .rpc_call_done = nfs4_get_lease_time_done,
8083 };
8084
8085 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
8086 {
8087 struct rpc_task *task;
8088 struct nfs4_get_lease_time_args args;
8089 struct nfs4_get_lease_time_res res = {
8090 .lr_fsinfo = fsinfo,
8091 };
8092 struct nfs4_get_lease_time_data data = {
8093 .args = &args,
8094 .res = &res,
8095 .clp = clp,
8096 };
8097 struct rpc_message msg = {
8098 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
8099 .rpc_argp = &args,
8100 .rpc_resp = &res,
8101 };
8102 struct rpc_task_setup task_setup = {
8103 .rpc_client = clp->cl_rpcclient,
8104 .rpc_message = &msg,
8105 .callback_ops = &nfs4_get_lease_time_ops,
8106 .callback_data = &data,
8107 .flags = RPC_TASK_TIMEOUT,
8108 };
8109 int status;
8110
8111 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
8112 task = rpc_run_task(&task_setup);
8113
8114 if (IS_ERR(task))
8115 return PTR_ERR(task);
8116
8117 status = task->tk_status;
8118 rpc_put_task(task);
8119 return status;
8120 }
8121
8122 /*
8123 * Initialize the values to be used by the client in CREATE_SESSION
8124 * If nfs4_init_session set the fore channel request and response sizes,
8125 * use them.
8126 *
8127 * Set the back channel max_resp_sz_cached to zero to force the client to
8128 * always set csa_cachethis to FALSE because the current implementation
8129 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
8130 */
8131 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
8132 struct rpc_clnt *clnt)
8133 {
8134 unsigned int max_rqst_sz, max_resp_sz;
8135 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
8136
8137 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
8138 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
8139
8140 /* Fore channel attributes */
8141 args->fc_attrs.max_rqst_sz = max_rqst_sz;
8142 args->fc_attrs.max_resp_sz = max_resp_sz;
8143 args->fc_attrs.max_ops = NFS4_MAX_OPS;
8144 args->fc_attrs.max_reqs = max_session_slots;
8145
8146 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
8147 "max_ops=%u max_reqs=%u\n",
8148 __func__,
8149 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
8150 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
8151
8152 /* Back channel attributes */
8153 args->bc_attrs.max_rqst_sz = max_bc_payload;
8154 args->bc_attrs.max_resp_sz = max_bc_payload;
8155 args->bc_attrs.max_resp_sz_cached = 0;
8156 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
8157 args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1);
8158
8159 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
8160 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
8161 __func__,
8162 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
8163 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
8164 args->bc_attrs.max_reqs);
8165 }
8166
8167 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
8168 struct nfs41_create_session_res *res)
8169 {
8170 struct nfs4_channel_attrs *sent = &args->fc_attrs;
8171 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
8172
8173 if (rcvd->max_resp_sz > sent->max_resp_sz)
8174 return -EINVAL;
8175 /*
8176 * Our requested max_ops is the minimum we need; we're not
8177 * prepared to break up compounds into smaller pieces than that.
8178 * So, no point even trying to continue if the server won't
8179 * cooperate:
8180 */
8181 if (rcvd->max_ops < sent->max_ops)
8182 return -EINVAL;
8183 if (rcvd->max_reqs == 0)
8184 return -EINVAL;
8185 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
8186 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
8187 return 0;
8188 }
8189
8190 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
8191 struct nfs41_create_session_res *res)
8192 {
8193 struct nfs4_channel_attrs *sent = &args->bc_attrs;
8194 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
8195
8196 if (!(res->flags & SESSION4_BACK_CHAN))
8197 goto out;
8198 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
8199 return -EINVAL;
8200 if (rcvd->max_resp_sz < sent->max_resp_sz)
8201 return -EINVAL;
8202 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
8203 return -EINVAL;
8204 if (rcvd->max_ops > sent->max_ops)
8205 return -EINVAL;
8206 if (rcvd->max_reqs > sent->max_reqs)
8207 return -EINVAL;
8208 out:
8209 return 0;
8210 }
8211
8212 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8213 struct nfs41_create_session_res *res)
8214 {
8215 int ret;
8216
8217 ret = nfs4_verify_fore_channel_attrs(args, res);
8218 if (ret)
8219 return ret;
8220 return nfs4_verify_back_channel_attrs(args, res);
8221 }
8222
8223 static void nfs4_update_session(struct nfs4_session *session,
8224 struct nfs41_create_session_res *res)
8225 {
8226 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8227 /* Mark client id and session as being confirmed */
8228 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8229 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8230 session->flags = res->flags;
8231 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8232 if (res->flags & SESSION4_BACK_CHAN)
8233 memcpy(&session->bc_attrs, &res->bc_attrs,
8234 sizeof(session->bc_attrs));
8235 }
8236
8237 static int _nfs4_proc_create_session(struct nfs_client *clp,
8238 struct rpc_cred *cred)
8239 {
8240 struct nfs4_session *session = clp->cl_session;
8241 struct nfs41_create_session_args args = {
8242 .client = clp,
8243 .clientid = clp->cl_clientid,
8244 .seqid = clp->cl_seqid,
8245 .cb_program = NFS4_CALLBACK,
8246 };
8247 struct nfs41_create_session_res res;
8248
8249 struct rpc_message msg = {
8250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8251 .rpc_argp = &args,
8252 .rpc_resp = &res,
8253 .rpc_cred = cred,
8254 };
8255 int status;
8256
8257 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8258 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8259
8260 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
8261 trace_nfs4_create_session(clp, status);
8262
8263 switch (status) {
8264 case -NFS4ERR_STALE_CLIENTID:
8265 case -NFS4ERR_DELAY:
8266 case -ETIMEDOUT:
8267 case -EACCES:
8268 case -EAGAIN:
8269 goto out;
8270 };
8271
8272 clp->cl_seqid++;
8273 if (!status) {
8274 /* Verify the session's negotiated channel_attrs values */
8275 status = nfs4_verify_channel_attrs(&args, &res);
8276 /* Increment the clientid slot sequence id */
8277 if (status)
8278 goto out;
8279 nfs4_update_session(session, &res);
8280 }
8281 out:
8282 return status;
8283 }
8284
8285 /*
8286 * Issues a CREATE_SESSION operation to the server.
8287 * It is the responsibility of the caller to verify the session is
8288 * expired before calling this routine.
8289 */
8290 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
8291 {
8292 int status;
8293 unsigned *ptr;
8294 struct nfs4_session *session = clp->cl_session;
8295
8296 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
8297
8298 status = _nfs4_proc_create_session(clp, cred);
8299 if (status)
8300 goto out;
8301
8302 /* Init or reset the session slot tables */
8303 status = nfs4_setup_session_slot_tables(session);
8304 dprintk("slot table setup returned %d\n", status);
8305 if (status)
8306 goto out;
8307
8308 ptr = (unsigned *)&session->sess_id.data[0];
8309 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
8310 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
8311 out:
8312 dprintk("<-- %s\n", __func__);
8313 return status;
8314 }
8315
8316 /*
8317 * Issue the over-the-wire RPC DESTROY_SESSION.
8318 * The caller must serialize access to this routine.
8319 */
8320 int nfs4_proc_destroy_session(struct nfs4_session *session,
8321 struct rpc_cred *cred)
8322 {
8323 struct rpc_message msg = {
8324 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
8325 .rpc_argp = session,
8326 .rpc_cred = cred,
8327 };
8328 int status = 0;
8329
8330 dprintk("--> nfs4_proc_destroy_session\n");
8331
8332 /* session is still being setup */
8333 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
8334 return 0;
8335
8336 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
8337 trace_nfs4_destroy_session(session->clp, status);
8338
8339 if (status)
8340 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
8341 "Session has been destroyed regardless...\n", status);
8342
8343 dprintk("<-- nfs4_proc_destroy_session\n");
8344 return status;
8345 }
8346
8347 /*
8348 * Renew the cl_session lease.
8349 */
8350 struct nfs4_sequence_data {
8351 struct nfs_client *clp;
8352 struct nfs4_sequence_args args;
8353 struct nfs4_sequence_res res;
8354 };
8355
8356 static void nfs41_sequence_release(void *data)
8357 {
8358 struct nfs4_sequence_data *calldata = data;
8359 struct nfs_client *clp = calldata->clp;
8360
8361 if (refcount_read(&clp->cl_count) > 1)
8362 nfs4_schedule_state_renewal(clp);
8363 nfs_put_client(clp);
8364 kfree(calldata);
8365 }
8366
8367 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8368 {
8369 switch(task->tk_status) {
8370 case -NFS4ERR_DELAY:
8371 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8372 return -EAGAIN;
8373 default:
8374 nfs4_schedule_lease_recovery(clp);
8375 }
8376 return 0;
8377 }
8378
8379 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
8380 {
8381 struct nfs4_sequence_data *calldata = data;
8382 struct nfs_client *clp = calldata->clp;
8383
8384 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
8385 return;
8386
8387 trace_nfs4_sequence(clp, task->tk_status);
8388 if (task->tk_status < 0) {
8389 dprintk("%s ERROR %d\n", __func__, task->tk_status);
8390 if (refcount_read(&clp->cl_count) == 1)
8391 goto out;
8392
8393 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
8394 rpc_restart_call_prepare(task);
8395 return;
8396 }
8397 }
8398 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
8399 out:
8400 dprintk("<-- %s\n", __func__);
8401 }
8402
8403 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
8404 {
8405 struct nfs4_sequence_data *calldata = data;
8406 struct nfs_client *clp = calldata->clp;
8407 struct nfs4_sequence_args *args;
8408 struct nfs4_sequence_res *res;
8409
8410 args = task->tk_msg.rpc_argp;
8411 res = task->tk_msg.rpc_resp;
8412
8413 nfs4_setup_sequence(clp, args, res, task);
8414 }
8415
8416 static const struct rpc_call_ops nfs41_sequence_ops = {
8417 .rpc_call_done = nfs41_sequence_call_done,
8418 .rpc_call_prepare = nfs41_sequence_prepare,
8419 .rpc_release = nfs41_sequence_release,
8420 };
8421
8422 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
8423 struct rpc_cred *cred,
8424 struct nfs4_slot *slot,
8425 bool is_privileged)
8426 {
8427 struct nfs4_sequence_data *calldata;
8428 struct rpc_message msg = {
8429 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
8430 .rpc_cred = cred,
8431 };
8432 struct rpc_task_setup task_setup_data = {
8433 .rpc_client = clp->cl_rpcclient,
8434 .rpc_message = &msg,
8435 .callback_ops = &nfs41_sequence_ops,
8436 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
8437 };
8438 struct rpc_task *ret;
8439
8440 ret = ERR_PTR(-EIO);
8441 if (!refcount_inc_not_zero(&clp->cl_count))
8442 goto out_err;
8443
8444 ret = ERR_PTR(-ENOMEM);
8445 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8446 if (calldata == NULL)
8447 goto out_put_clp;
8448 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
8449 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
8450 msg.rpc_argp = &calldata->args;
8451 msg.rpc_resp = &calldata->res;
8452 calldata->clp = clp;
8453 task_setup_data.callback_data = calldata;
8454
8455 ret = rpc_run_task(&task_setup_data);
8456 if (IS_ERR(ret))
8457 goto out_err;
8458 return ret;
8459 out_put_clp:
8460 nfs_put_client(clp);
8461 out_err:
8462 nfs41_release_slot(slot);
8463 return ret;
8464 }
8465
8466 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
8467 {
8468 struct rpc_task *task;
8469 int ret = 0;
8470
8471 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
8472 return -EAGAIN;
8473 task = _nfs41_proc_sequence(clp, cred, NULL, false);
8474 if (IS_ERR(task))
8475 ret = PTR_ERR(task);
8476 else
8477 rpc_put_task_async(task);
8478 dprintk("<-- %s status=%d\n", __func__, ret);
8479 return ret;
8480 }
8481
8482 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
8483 {
8484 struct rpc_task *task;
8485 int ret;
8486
8487 task = _nfs41_proc_sequence(clp, cred, NULL, true);
8488 if (IS_ERR(task)) {
8489 ret = PTR_ERR(task);
8490 goto out;
8491 }
8492 ret = rpc_wait_for_completion_task(task);
8493 if (!ret)
8494 ret = task->tk_status;
8495 rpc_put_task(task);
8496 out:
8497 dprintk("<-- %s status=%d\n", __func__, ret);
8498 return ret;
8499 }
8500
8501 struct nfs4_reclaim_complete_data {
8502 struct nfs_client *clp;
8503 struct nfs41_reclaim_complete_args arg;
8504 struct nfs41_reclaim_complete_res res;
8505 };
8506
8507 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
8508 {
8509 struct nfs4_reclaim_complete_data *calldata = data;
8510
8511 nfs4_setup_sequence(calldata->clp,
8512 &calldata->arg.seq_args,
8513 &calldata->res.seq_res,
8514 task);
8515 }
8516
8517 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8518 {
8519 switch(task->tk_status) {
8520 case 0:
8521 wake_up_all(&clp->cl_lock_waitq);
8522 /* Fallthrough */
8523 case -NFS4ERR_COMPLETE_ALREADY:
8524 case -NFS4ERR_WRONG_CRED: /* What to do here? */
8525 break;
8526 case -NFS4ERR_DELAY:
8527 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8528 /* fall through */
8529 case -NFS4ERR_RETRY_UNCACHED_REP:
8530 return -EAGAIN;
8531 case -NFS4ERR_BADSESSION:
8532 case -NFS4ERR_DEADSESSION:
8533 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
8534 nfs4_schedule_session_recovery(clp->cl_session,
8535 task->tk_status);
8536 break;
8537 default:
8538 nfs4_schedule_lease_recovery(clp);
8539 }
8540 return 0;
8541 }
8542
8543 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
8544 {
8545 struct nfs4_reclaim_complete_data *calldata = data;
8546 struct nfs_client *clp = calldata->clp;
8547 struct nfs4_sequence_res *res = &calldata->res.seq_res;
8548
8549 dprintk("--> %s\n", __func__);
8550 if (!nfs41_sequence_done(task, res))
8551 return;
8552
8553 trace_nfs4_reclaim_complete(clp, task->tk_status);
8554 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
8555 rpc_restart_call_prepare(task);
8556 return;
8557 }
8558 dprintk("<-- %s\n", __func__);
8559 }
8560
8561 static void nfs4_free_reclaim_complete_data(void *data)
8562 {
8563 struct nfs4_reclaim_complete_data *calldata = data;
8564
8565 kfree(calldata);
8566 }
8567
8568 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
8569 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
8570 .rpc_call_done = nfs4_reclaim_complete_done,
8571 .rpc_release = nfs4_free_reclaim_complete_data,
8572 };
8573
8574 /*
8575 * Issue a global reclaim complete.
8576 */
8577 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
8578 struct rpc_cred *cred)
8579 {
8580 struct nfs4_reclaim_complete_data *calldata;
8581 struct rpc_task *task;
8582 struct rpc_message msg = {
8583 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
8584 .rpc_cred = cred,
8585 };
8586 struct rpc_task_setup task_setup_data = {
8587 .rpc_client = clp->cl_rpcclient,
8588 .rpc_message = &msg,
8589 .callback_ops = &nfs4_reclaim_complete_call_ops,
8590 .flags = RPC_TASK_ASYNC,
8591 };
8592 int status = -ENOMEM;
8593
8594 dprintk("--> %s\n", __func__);
8595 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8596 if (calldata == NULL)
8597 goto out;
8598 calldata->clp = clp;
8599 calldata->arg.one_fs = 0;
8600
8601 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
8602 msg.rpc_argp = &calldata->arg;
8603 msg.rpc_resp = &calldata->res;
8604 task_setup_data.callback_data = calldata;
8605 task = rpc_run_task(&task_setup_data);
8606 if (IS_ERR(task)) {
8607 status = PTR_ERR(task);
8608 goto out;
8609 }
8610 status = rpc_wait_for_completion_task(task);
8611 if (status == 0)
8612 status = task->tk_status;
8613 rpc_put_task(task);
8614 out:
8615 dprintk("<-- %s status=%d\n", __func__, status);
8616 return status;
8617 }
8618
8619 static void
8620 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
8621 {
8622 struct nfs4_layoutget *lgp = calldata;
8623 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
8624
8625 dprintk("--> %s\n", __func__);
8626 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
8627 &lgp->res.seq_res, task);
8628 dprintk("<-- %s\n", __func__);
8629 }
8630
8631 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
8632 {
8633 struct nfs4_layoutget *lgp = calldata;
8634
8635 dprintk("--> %s\n", __func__);
8636 nfs41_sequence_process(task, &lgp->res.seq_res);
8637 dprintk("<-- %s\n", __func__);
8638 }
8639
8640 static int
8641 nfs4_layoutget_handle_exception(struct rpc_task *task,
8642 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
8643 {
8644 struct inode *inode = lgp->args.inode;
8645 struct nfs_server *server = NFS_SERVER(inode);
8646 struct pnfs_layout_hdr *lo;
8647 int nfs4err = task->tk_status;
8648 int err, status = 0;
8649 LIST_HEAD(head);
8650
8651 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
8652
8653 switch (nfs4err) {
8654 case 0:
8655 goto out;
8656
8657 /*
8658 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
8659 * on the file. set tk_status to -ENODATA to tell upper layer to
8660 * retry go inband.
8661 */
8662 case -NFS4ERR_LAYOUTUNAVAILABLE:
8663 status = -ENODATA;
8664 goto out;
8665 /*
8666 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
8667 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
8668 */
8669 case -NFS4ERR_BADLAYOUT:
8670 status = -EOVERFLOW;
8671 goto out;
8672 /*
8673 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
8674 * (or clients) writing to the same RAID stripe except when
8675 * the minlength argument is 0 (see RFC5661 section 18.43.3).
8676 *
8677 * Treat it like we would RECALLCONFLICT -- we retry for a little
8678 * while, and then eventually give up.
8679 */
8680 case -NFS4ERR_LAYOUTTRYLATER:
8681 if (lgp->args.minlength == 0) {
8682 status = -EOVERFLOW;
8683 goto out;
8684 }
8685 status = -EBUSY;
8686 break;
8687 case -NFS4ERR_RECALLCONFLICT:
8688 status = -ERECALLCONFLICT;
8689 break;
8690 case -NFS4ERR_DELEG_REVOKED:
8691 case -NFS4ERR_ADMIN_REVOKED:
8692 case -NFS4ERR_EXPIRED:
8693 case -NFS4ERR_BAD_STATEID:
8694 exception->timeout = 0;
8695 spin_lock(&inode->i_lock);
8696 lo = NFS_I(inode)->layout;
8697 /* If the open stateid was bad, then recover it. */
8698 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
8699 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
8700 spin_unlock(&inode->i_lock);
8701 exception->state = lgp->args.ctx->state;
8702 exception->stateid = &lgp->args.stateid;
8703 break;
8704 }
8705
8706 /*
8707 * Mark the bad layout state as invalid, then retry
8708 */
8709 pnfs_mark_layout_stateid_invalid(lo, &head);
8710 spin_unlock(&inode->i_lock);
8711 nfs_commit_inode(inode, 0);
8712 pnfs_free_lseg_list(&head);
8713 status = -EAGAIN;
8714 goto out;
8715 }
8716
8717 nfs4_sequence_free_slot(&lgp->res.seq_res);
8718 err = nfs4_handle_exception(server, nfs4err, exception);
8719 if (!status) {
8720 if (exception->retry)
8721 status = -EAGAIN;
8722 else
8723 status = err;
8724 }
8725 out:
8726 dprintk("<-- %s\n", __func__);
8727 return status;
8728 }
8729
8730 size_t max_response_pages(struct nfs_server *server)
8731 {
8732 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
8733 return nfs_page_array_len(0, max_resp_sz);
8734 }
8735
8736 static void nfs4_layoutget_release(void *calldata)
8737 {
8738 struct nfs4_layoutget *lgp = calldata;
8739
8740 dprintk("--> %s\n", __func__);
8741 nfs4_sequence_free_slot(&lgp->res.seq_res);
8742 pnfs_layoutget_free(lgp);
8743 dprintk("<-- %s\n", __func__);
8744 }
8745
8746 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
8747 .rpc_call_prepare = nfs4_layoutget_prepare,
8748 .rpc_call_done = nfs4_layoutget_done,
8749 .rpc_release = nfs4_layoutget_release,
8750 };
8751
8752 struct pnfs_layout_segment *
8753 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
8754 {
8755 struct inode *inode = lgp->args.inode;
8756 struct nfs_server *server = NFS_SERVER(inode);
8757 struct rpc_task *task;
8758 struct rpc_message msg = {
8759 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
8760 .rpc_argp = &lgp->args,
8761 .rpc_resp = &lgp->res,
8762 .rpc_cred = lgp->cred,
8763 };
8764 struct rpc_task_setup task_setup_data = {
8765 .rpc_client = server->client,
8766 .rpc_message = &msg,
8767 .callback_ops = &nfs4_layoutget_call_ops,
8768 .callback_data = lgp,
8769 .flags = RPC_TASK_ASYNC,
8770 };
8771 struct pnfs_layout_segment *lseg = NULL;
8772 struct nfs4_exception exception = {
8773 .inode = inode,
8774 .timeout = *timeout,
8775 };
8776 int status = 0;
8777
8778 dprintk("--> %s\n", __func__);
8779
8780 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
8781 pnfs_get_layout_hdr(NFS_I(inode)->layout);
8782
8783 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
8784
8785 task = rpc_run_task(&task_setup_data);
8786 if (IS_ERR(task))
8787 return ERR_CAST(task);
8788 status = rpc_wait_for_completion_task(task);
8789 if (status == 0) {
8790 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
8791 *timeout = exception.timeout;
8792 }
8793
8794 trace_nfs4_layoutget(lgp->args.ctx,
8795 &lgp->args.range,
8796 &lgp->res.range,
8797 &lgp->res.stateid,
8798 status);
8799
8800 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8801 if (status == 0 && lgp->res.layoutp->len)
8802 lseg = pnfs_layout_process(lgp);
8803 rpc_put_task(task);
8804 dprintk("<-- %s status=%d\n", __func__, status);
8805 if (status)
8806 return ERR_PTR(status);
8807 return lseg;
8808 }
8809
8810 static void
8811 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8812 {
8813 struct nfs4_layoutreturn *lrp = calldata;
8814
8815 dprintk("--> %s\n", __func__);
8816 nfs4_setup_sequence(lrp->clp,
8817 &lrp->args.seq_args,
8818 &lrp->res.seq_res,
8819 task);
8820 }
8821
8822 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8823 {
8824 struct nfs4_layoutreturn *lrp = calldata;
8825 struct nfs_server *server;
8826
8827 dprintk("--> %s\n", __func__);
8828
8829 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
8830 return;
8831
8832 server = NFS_SERVER(lrp->args.inode);
8833 switch (task->tk_status) {
8834 case -NFS4ERR_OLD_STATEID:
8835 if (nfs4_refresh_layout_stateid(&lrp->args.stateid,
8836 lrp->args.inode))
8837 goto out_restart;
8838 /* Fallthrough */
8839 default:
8840 task->tk_status = 0;
8841 /* Fallthrough */
8842 case 0:
8843 break;
8844 case -NFS4ERR_DELAY:
8845 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8846 break;
8847 goto out_restart;
8848 }
8849 dprintk("<-- %s\n", __func__);
8850 return;
8851 out_restart:
8852 task->tk_status = 0;
8853 nfs4_sequence_free_slot(&lrp->res.seq_res);
8854 rpc_restart_call_prepare(task);
8855 }
8856
8857 static void nfs4_layoutreturn_release(void *calldata)
8858 {
8859 struct nfs4_layoutreturn *lrp = calldata;
8860 struct pnfs_layout_hdr *lo = lrp->args.layout;
8861
8862 dprintk("--> %s\n", __func__);
8863 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
8864 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
8865 nfs4_sequence_free_slot(&lrp->res.seq_res);
8866 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
8867 lrp->ld_private.ops->free(&lrp->ld_private);
8868 pnfs_put_layout_hdr(lrp->args.layout);
8869 nfs_iput_and_deactive(lrp->inode);
8870 kfree(calldata);
8871 dprintk("<-- %s\n", __func__);
8872 }
8873
8874 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8875 .rpc_call_prepare = nfs4_layoutreturn_prepare,
8876 .rpc_call_done = nfs4_layoutreturn_done,
8877 .rpc_release = nfs4_layoutreturn_release,
8878 };
8879
8880 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8881 {
8882 struct rpc_task *task;
8883 struct rpc_message msg = {
8884 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8885 .rpc_argp = &lrp->args,
8886 .rpc_resp = &lrp->res,
8887 .rpc_cred = lrp->cred,
8888 };
8889 struct rpc_task_setup task_setup_data = {
8890 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8891 .rpc_message = &msg,
8892 .callback_ops = &nfs4_layoutreturn_call_ops,
8893 .callback_data = lrp,
8894 };
8895 int status = 0;
8896
8897 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8898 NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8899 &task_setup_data.rpc_client, &msg);
8900
8901 dprintk("--> %s\n", __func__);
8902 if (!sync) {
8903 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8904 if (!lrp->inode) {
8905 nfs4_layoutreturn_release(lrp);
8906 return -EAGAIN;
8907 }
8908 task_setup_data.flags |= RPC_TASK_ASYNC;
8909 }
8910 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
8911 task = rpc_run_task(&task_setup_data);
8912 if (IS_ERR(task))
8913 return PTR_ERR(task);
8914 if (sync)
8915 status = task->tk_status;
8916 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8917 dprintk("<-- %s status=%d\n", __func__, status);
8918 rpc_put_task(task);
8919 return status;
8920 }
8921
8922 static int
8923 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8924 struct pnfs_device *pdev,
8925 struct rpc_cred *cred)
8926 {
8927 struct nfs4_getdeviceinfo_args args = {
8928 .pdev = pdev,
8929 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8930 NOTIFY_DEVICEID4_DELETE,
8931 };
8932 struct nfs4_getdeviceinfo_res res = {
8933 .pdev = pdev,
8934 };
8935 struct rpc_message msg = {
8936 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8937 .rpc_argp = &args,
8938 .rpc_resp = &res,
8939 .rpc_cred = cred,
8940 };
8941 int status;
8942
8943 dprintk("--> %s\n", __func__);
8944 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8945 if (res.notification & ~args.notify_types)
8946 dprintk("%s: unsupported notification\n", __func__);
8947 if (res.notification != args.notify_types)
8948 pdev->nocache = 1;
8949
8950 dprintk("<-- %s status=%d\n", __func__, status);
8951
8952 return status;
8953 }
8954
8955 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8956 struct pnfs_device *pdev,
8957 struct rpc_cred *cred)
8958 {
8959 struct nfs4_exception exception = { };
8960 int err;
8961
8962 do {
8963 err = nfs4_handle_exception(server,
8964 _nfs4_proc_getdeviceinfo(server, pdev, cred),
8965 &exception);
8966 } while (exception.retry);
8967 return err;
8968 }
8969 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8970
8971 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8972 {
8973 struct nfs4_layoutcommit_data *data = calldata;
8974 struct nfs_server *server = NFS_SERVER(data->args.inode);
8975
8976 nfs4_setup_sequence(server->nfs_client,
8977 &data->args.seq_args,
8978 &data->res.seq_res,
8979 task);
8980 }
8981
8982 static void
8983 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8984 {
8985 struct nfs4_layoutcommit_data *data = calldata;
8986 struct nfs_server *server = NFS_SERVER(data->args.inode);
8987
8988 if (!nfs41_sequence_done(task, &data->res.seq_res))
8989 return;
8990
8991 switch (task->tk_status) { /* Just ignore these failures */
8992 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8993 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
8994 case -NFS4ERR_BADLAYOUT: /* no layout */
8995 case -NFS4ERR_GRACE: /* loca_recalim always false */
8996 task->tk_status = 0;
8997 case 0:
8998 break;
8999 default:
9000 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9001 rpc_restart_call_prepare(task);
9002 return;
9003 }
9004 }
9005 }
9006
9007 static void nfs4_layoutcommit_release(void *calldata)
9008 {
9009 struct nfs4_layoutcommit_data *data = calldata;
9010
9011 pnfs_cleanup_layoutcommit(data);
9012 nfs_post_op_update_inode_force_wcc(data->args.inode,
9013 data->res.fattr);
9014 put_rpccred(data->cred);
9015 nfs_iput_and_deactive(data->inode);
9016 kfree(data);
9017 }
9018
9019 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9020 .rpc_call_prepare = nfs4_layoutcommit_prepare,
9021 .rpc_call_done = nfs4_layoutcommit_done,
9022 .rpc_release = nfs4_layoutcommit_release,
9023 };
9024
9025 int
9026 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9027 {
9028 struct rpc_message msg = {
9029 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9030 .rpc_argp = &data->args,
9031 .rpc_resp = &data->res,
9032 .rpc_cred = data->cred,
9033 };
9034 struct rpc_task_setup task_setup_data = {
9035 .task = &data->task,
9036 .rpc_client = NFS_CLIENT(data->args.inode),
9037 .rpc_message = &msg,
9038 .callback_ops = &nfs4_layoutcommit_ops,
9039 .callback_data = data,
9040 };
9041 struct rpc_task *task;
9042 int status = 0;
9043
9044 dprintk("NFS: initiating layoutcommit call. sync %d "
9045 "lbw: %llu inode %lu\n", sync,
9046 data->args.lastbytewritten,
9047 data->args.inode->i_ino);
9048
9049 if (!sync) {
9050 data->inode = nfs_igrab_and_active(data->args.inode);
9051 if (data->inode == NULL) {
9052 nfs4_layoutcommit_release(data);
9053 return -EAGAIN;
9054 }
9055 task_setup_data.flags = RPC_TASK_ASYNC;
9056 }
9057 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
9058 task = rpc_run_task(&task_setup_data);
9059 if (IS_ERR(task))
9060 return PTR_ERR(task);
9061 if (sync)
9062 status = task->tk_status;
9063 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
9064 dprintk("%s: status %d\n", __func__, status);
9065 rpc_put_task(task);
9066 return status;
9067 }
9068
9069 /**
9070 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
9071 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
9072 */
9073 static int
9074 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9075 struct nfs_fsinfo *info,
9076 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
9077 {
9078 struct nfs41_secinfo_no_name_args args = {
9079 .style = SECINFO_STYLE_CURRENT_FH,
9080 };
9081 struct nfs4_secinfo_res res = {
9082 .flavors = flavors,
9083 };
9084 struct rpc_message msg = {
9085 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
9086 .rpc_argp = &args,
9087 .rpc_resp = &res,
9088 };
9089 struct rpc_clnt *clnt = server->client;
9090 struct rpc_cred *cred = NULL;
9091 int status;
9092
9093 if (use_integrity) {
9094 clnt = server->nfs_client->cl_rpcclient;
9095 cred = nfs4_get_clid_cred(server->nfs_client);
9096 msg.rpc_cred = cred;
9097 }
9098
9099 dprintk("--> %s\n", __func__);
9100 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
9101 &res.seq_res, 0);
9102 dprintk("<-- %s status=%d\n", __func__, status);
9103
9104 if (cred)
9105 put_rpccred(cred);
9106
9107 return status;
9108 }
9109
9110 static int
9111 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9112 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
9113 {
9114 struct nfs4_exception exception = { };
9115 int err;
9116 do {
9117 /* first try using integrity protection */
9118 err = -NFS4ERR_WRONGSEC;
9119
9120 /* try to use integrity protection with machine cred */
9121 if (_nfs4_is_integrity_protected(server->nfs_client))
9122 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9123 flavors, true);
9124
9125 /*
9126 * if unable to use integrity protection, or SECINFO with
9127 * integrity protection returns NFS4ERR_WRONGSEC (which is
9128 * disallowed by spec, but exists in deployed servers) use
9129 * the current filesystem's rpc_client and the user cred.
9130 */
9131 if (err == -NFS4ERR_WRONGSEC)
9132 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9133 flavors, false);
9134
9135 switch (err) {
9136 case 0:
9137 case -NFS4ERR_WRONGSEC:
9138 case -ENOTSUPP:
9139 goto out;
9140 default:
9141 err = nfs4_handle_exception(server, err, &exception);
9142 }
9143 } while (exception.retry);
9144 out:
9145 return err;
9146 }
9147
9148 static int
9149 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
9150 struct nfs_fsinfo *info)
9151 {
9152 int err;
9153 struct page *page;
9154 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9155 struct nfs4_secinfo_flavors *flavors;
9156 struct nfs4_secinfo4 *secinfo;
9157 int i;
9158
9159 page = alloc_page(GFP_KERNEL);
9160 if (!page) {
9161 err = -ENOMEM;
9162 goto out;
9163 }
9164
9165 flavors = page_address(page);
9166 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
9167
9168 /*
9169 * Fall back on "guess and check" method if
9170 * the server doesn't support SECINFO_NO_NAME
9171 */
9172 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
9173 err = nfs4_find_root_sec(server, fhandle, info);
9174 goto out_freepage;
9175 }
9176 if (err)
9177 goto out_freepage;
9178
9179 for (i = 0; i < flavors->num_flavors; i++) {
9180 secinfo = &flavors->flavors[i];
9181
9182 switch (secinfo->flavor) {
9183 case RPC_AUTH_NULL:
9184 case RPC_AUTH_UNIX:
9185 case RPC_AUTH_GSS:
9186 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9187 &secinfo->flavor_info);
9188 break;
9189 default:
9190 flavor = RPC_AUTH_MAXFLAVOR;
9191 break;
9192 }
9193
9194 if (!nfs_auth_info_match(&server->auth_info, flavor))
9195 flavor = RPC_AUTH_MAXFLAVOR;
9196
9197 if (flavor != RPC_AUTH_MAXFLAVOR) {
9198 err = nfs4_lookup_root_sec(server, fhandle,
9199 info, flavor);
9200 if (!err)
9201 break;
9202 }
9203 }
9204
9205 if (flavor == RPC_AUTH_MAXFLAVOR)
9206 err = -EPERM;
9207
9208 out_freepage:
9209 put_page(page);
9210 if (err == -EACCES)
9211 return -EPERM;
9212 out:
9213 return err;
9214 }
9215
9216 static int _nfs41_test_stateid(struct nfs_server *server,
9217 nfs4_stateid *stateid,
9218 struct rpc_cred *cred)
9219 {
9220 int status;
9221 struct nfs41_test_stateid_args args = {
9222 .stateid = stateid,
9223 };
9224 struct nfs41_test_stateid_res res;
9225 struct rpc_message msg = {
9226 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9227 .rpc_argp = &args,
9228 .rpc_resp = &res,
9229 .rpc_cred = cred,
9230 };
9231 struct rpc_clnt *rpc_client = server->client;
9232
9233 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9234 &rpc_client, &msg);
9235
9236 dprintk("NFS call test_stateid %p\n", stateid);
9237 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
9238 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9239 &args.seq_args, &res.seq_res);
9240 if (status != NFS_OK) {
9241 dprintk("NFS reply test_stateid: failed, %d\n", status);
9242 return status;
9243 }
9244 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
9245 return -res.status;
9246 }
9247
9248 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
9249 int err, struct nfs4_exception *exception)
9250 {
9251 exception->retry = 0;
9252 switch(err) {
9253 case -NFS4ERR_DELAY:
9254 case -NFS4ERR_RETRY_UNCACHED_REP:
9255 nfs4_handle_exception(server, err, exception);
9256 break;
9257 case -NFS4ERR_BADSESSION:
9258 case -NFS4ERR_BADSLOT:
9259 case -NFS4ERR_BAD_HIGH_SLOT:
9260 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9261 case -NFS4ERR_DEADSESSION:
9262 nfs4_do_handle_exception(server, err, exception);
9263 }
9264 }
9265
9266 /**
9267 * nfs41_test_stateid - perform a TEST_STATEID operation
9268 *
9269 * @server: server / transport on which to perform the operation
9270 * @stateid: state ID to test
9271 * @cred: credential
9272 *
9273 * Returns NFS_OK if the server recognizes that "stateid" is valid.
9274 * Otherwise a negative NFS4ERR value is returned if the operation
9275 * failed or the state ID is not currently valid.
9276 */
9277 static int nfs41_test_stateid(struct nfs_server *server,
9278 nfs4_stateid *stateid,
9279 struct rpc_cred *cred)
9280 {
9281 struct nfs4_exception exception = { };
9282 int err;
9283 do {
9284 err = _nfs41_test_stateid(server, stateid, cred);
9285 nfs4_handle_delay_or_session_error(server, err, &exception);
9286 } while (exception.retry);
9287 return err;
9288 }
9289
9290 struct nfs_free_stateid_data {
9291 struct nfs_server *server;
9292 struct nfs41_free_stateid_args args;
9293 struct nfs41_free_stateid_res res;
9294 };
9295
9296 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
9297 {
9298 struct nfs_free_stateid_data *data = calldata;
9299 nfs4_setup_sequence(data->server->nfs_client,
9300 &data->args.seq_args,
9301 &data->res.seq_res,
9302 task);
9303 }
9304
9305 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
9306 {
9307 struct nfs_free_stateid_data *data = calldata;
9308
9309 nfs41_sequence_done(task, &data->res.seq_res);
9310
9311 switch (task->tk_status) {
9312 case -NFS4ERR_DELAY:
9313 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
9314 rpc_restart_call_prepare(task);
9315 }
9316 }
9317
9318 static void nfs41_free_stateid_release(void *calldata)
9319 {
9320 kfree(calldata);
9321 }
9322
9323 static const struct rpc_call_ops nfs41_free_stateid_ops = {
9324 .rpc_call_prepare = nfs41_free_stateid_prepare,
9325 .rpc_call_done = nfs41_free_stateid_done,
9326 .rpc_release = nfs41_free_stateid_release,
9327 };
9328
9329 /**
9330 * nfs41_free_stateid - perform a FREE_STATEID operation
9331 *
9332 * @server: server / transport on which to perform the operation
9333 * @stateid: state ID to release
9334 * @cred: credential
9335 * @is_recovery: set to true if this call needs to be privileged
9336 *
9337 * Note: this function is always asynchronous.
9338 */
9339 static int nfs41_free_stateid(struct nfs_server *server,
9340 const nfs4_stateid *stateid,
9341 struct rpc_cred *cred,
9342 bool privileged)
9343 {
9344 struct rpc_message msg = {
9345 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
9346 .rpc_cred = cred,
9347 };
9348 struct rpc_task_setup task_setup = {
9349 .rpc_client = server->client,
9350 .rpc_message = &msg,
9351 .callback_ops = &nfs41_free_stateid_ops,
9352 .flags = RPC_TASK_ASYNC,
9353 };
9354 struct nfs_free_stateid_data *data;
9355 struct rpc_task *task;
9356
9357 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9358 &task_setup.rpc_client, &msg);
9359
9360 dprintk("NFS call free_stateid %p\n", stateid);
9361 data = kmalloc(sizeof(*data), GFP_NOFS);
9362 if (!data)
9363 return -ENOMEM;
9364 data->server = server;
9365 nfs4_stateid_copy(&data->args.stateid, stateid);
9366
9367 task_setup.callback_data = data;
9368
9369 msg.rpc_argp = &data->args;
9370 msg.rpc_resp = &data->res;
9371 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
9372 task = rpc_run_task(&task_setup);
9373 if (IS_ERR(task))
9374 return PTR_ERR(task);
9375 rpc_put_task(task);
9376 return 0;
9377 }
9378
9379 static void
9380 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
9381 {
9382 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
9383
9384 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
9385 nfs4_free_lock_state(server, lsp);
9386 }
9387
9388 static bool nfs41_match_stateid(const nfs4_stateid *s1,
9389 const nfs4_stateid *s2)
9390 {
9391 if (s1->type != s2->type)
9392 return false;
9393
9394 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
9395 return false;
9396
9397 if (s1->seqid == s2->seqid)
9398 return true;
9399
9400 return s1->seqid == 0 || s2->seqid == 0;
9401 }
9402
9403 #endif /* CONFIG_NFS_V4_1 */
9404
9405 static bool nfs4_match_stateid(const nfs4_stateid *s1,
9406 const nfs4_stateid *s2)
9407 {
9408 return nfs4_stateid_match(s1, s2);
9409 }
9410
9411
9412 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
9413 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9414 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9415 .recover_open = nfs4_open_reclaim,
9416 .recover_lock = nfs4_lock_reclaim,
9417 .establish_clid = nfs4_init_clientid,
9418 .detect_trunking = nfs40_discover_server_trunking,
9419 };
9420
9421 #if defined(CONFIG_NFS_V4_1)
9422 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
9423 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9424 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9425 .recover_open = nfs4_open_reclaim,
9426 .recover_lock = nfs4_lock_reclaim,
9427 .establish_clid = nfs41_init_clientid,
9428 .reclaim_complete = nfs41_proc_reclaim_complete,
9429 .detect_trunking = nfs41_discover_server_trunking,
9430 };
9431 #endif /* CONFIG_NFS_V4_1 */
9432
9433 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
9434 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9435 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9436 .recover_open = nfs40_open_expired,
9437 .recover_lock = nfs4_lock_expired,
9438 .establish_clid = nfs4_init_clientid,
9439 };
9440
9441 #if defined(CONFIG_NFS_V4_1)
9442 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
9443 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9444 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9445 .recover_open = nfs41_open_expired,
9446 .recover_lock = nfs41_lock_expired,
9447 .establish_clid = nfs41_init_clientid,
9448 };
9449 #endif /* CONFIG_NFS_V4_1 */
9450
9451 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
9452 .sched_state_renewal = nfs4_proc_async_renew,
9453 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
9454 .renew_lease = nfs4_proc_renew,
9455 };
9456
9457 #if defined(CONFIG_NFS_V4_1)
9458 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
9459 .sched_state_renewal = nfs41_proc_async_sequence,
9460 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
9461 .renew_lease = nfs4_proc_sequence,
9462 };
9463 #endif
9464
9465 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
9466 .get_locations = _nfs40_proc_get_locations,
9467 .fsid_present = _nfs40_proc_fsid_present,
9468 };
9469
9470 #if defined(CONFIG_NFS_V4_1)
9471 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
9472 .get_locations = _nfs41_proc_get_locations,
9473 .fsid_present = _nfs41_proc_fsid_present,
9474 };
9475 #endif /* CONFIG_NFS_V4_1 */
9476
9477 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
9478 .minor_version = 0,
9479 .init_caps = NFS_CAP_READDIRPLUS
9480 | NFS_CAP_ATOMIC_OPEN
9481 | NFS_CAP_POSIX_LOCK,
9482 .init_client = nfs40_init_client,
9483 .shutdown_client = nfs40_shutdown_client,
9484 .match_stateid = nfs4_match_stateid,
9485 .find_root_sec = nfs4_find_root_sec,
9486 .free_lock_state = nfs4_release_lockowner,
9487 .test_and_free_expired = nfs40_test_and_free_expired_stateid,
9488 .alloc_seqid = nfs_alloc_seqid,
9489 .call_sync_ops = &nfs40_call_sync_ops,
9490 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
9491 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
9492 .state_renewal_ops = &nfs40_state_renewal_ops,
9493 .mig_recovery_ops = &nfs40_mig_recovery_ops,
9494 };
9495
9496 #if defined(CONFIG_NFS_V4_1)
9497 static struct nfs_seqid *
9498 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
9499 {
9500 return NULL;
9501 }
9502
9503 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
9504 .minor_version = 1,
9505 .init_caps = NFS_CAP_READDIRPLUS
9506 | NFS_CAP_ATOMIC_OPEN
9507 | NFS_CAP_POSIX_LOCK
9508 | NFS_CAP_STATEID_NFSV41
9509 | NFS_CAP_ATOMIC_OPEN_V1
9510 | NFS_CAP_LGOPEN,
9511 .init_client = nfs41_init_client,
9512 .shutdown_client = nfs41_shutdown_client,
9513 .match_stateid = nfs41_match_stateid,
9514 .find_root_sec = nfs41_find_root_sec,
9515 .free_lock_state = nfs41_free_lock_state,
9516 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9517 .alloc_seqid = nfs_alloc_no_seqid,
9518 .session_trunk = nfs4_test_session_trunk,
9519 .call_sync_ops = &nfs41_call_sync_ops,
9520 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9521 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9522 .state_renewal_ops = &nfs41_state_renewal_ops,
9523 .mig_recovery_ops = &nfs41_mig_recovery_ops,
9524 };
9525 #endif
9526
9527 #if defined(CONFIG_NFS_V4_2)
9528 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
9529 .minor_version = 2,
9530 .init_caps = NFS_CAP_READDIRPLUS
9531 | NFS_CAP_ATOMIC_OPEN
9532 | NFS_CAP_POSIX_LOCK
9533 | NFS_CAP_STATEID_NFSV41
9534 | NFS_CAP_ATOMIC_OPEN_V1
9535 | NFS_CAP_LGOPEN
9536 | NFS_CAP_ALLOCATE
9537 | NFS_CAP_COPY
9538 | NFS_CAP_DEALLOCATE
9539 | NFS_CAP_SEEK
9540 | NFS_CAP_LAYOUTSTATS
9541 | NFS_CAP_CLONE,
9542 .init_client = nfs41_init_client,
9543 .shutdown_client = nfs41_shutdown_client,
9544 .match_stateid = nfs41_match_stateid,
9545 .find_root_sec = nfs41_find_root_sec,
9546 .free_lock_state = nfs41_free_lock_state,
9547 .call_sync_ops = &nfs41_call_sync_ops,
9548 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9549 .alloc_seqid = nfs_alloc_no_seqid,
9550 .session_trunk = nfs4_test_session_trunk,
9551 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9552 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9553 .state_renewal_ops = &nfs41_state_renewal_ops,
9554 .mig_recovery_ops = &nfs41_mig_recovery_ops,
9555 };
9556 #endif
9557
9558 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
9559 [0] = &nfs_v4_0_minor_ops,
9560 #if defined(CONFIG_NFS_V4_1)
9561 [1] = &nfs_v4_1_minor_ops,
9562 #endif
9563 #if defined(CONFIG_NFS_V4_2)
9564 [2] = &nfs_v4_2_minor_ops,
9565 #endif
9566 };
9567
9568 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
9569 {
9570 ssize_t error, error2;
9571
9572 error = generic_listxattr(dentry, list, size);
9573 if (error < 0)
9574 return error;
9575 if (list) {
9576 list += error;
9577 size -= error;
9578 }
9579
9580 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
9581 if (error2 < 0)
9582 return error2;
9583 return error + error2;
9584 }
9585
9586 static const struct inode_operations nfs4_dir_inode_operations = {
9587 .create = nfs_create,
9588 .lookup = nfs_lookup,
9589 .atomic_open = nfs_atomic_open,
9590 .link = nfs_link,
9591 .unlink = nfs_unlink,
9592 .symlink = nfs_symlink,
9593 .mkdir = nfs_mkdir,
9594 .rmdir = nfs_rmdir,
9595 .mknod = nfs_mknod,
9596 .rename = nfs_rename,
9597 .permission = nfs_permission,
9598 .getattr = nfs_getattr,
9599 .setattr = nfs_setattr,
9600 .listxattr = nfs4_listxattr,
9601 };
9602
9603 static const struct inode_operations nfs4_file_inode_operations = {
9604 .permission = nfs_permission,
9605 .getattr = nfs_getattr,
9606 .setattr = nfs_setattr,
9607 .listxattr = nfs4_listxattr,
9608 };
9609
9610 const struct nfs_rpc_ops nfs_v4_clientops = {
9611 .version = 4, /* protocol version */
9612 .dentry_ops = &nfs4_dentry_operations,
9613 .dir_inode_ops = &nfs4_dir_inode_operations,
9614 .file_inode_ops = &nfs4_file_inode_operations,
9615 .file_ops = &nfs4_file_operations,
9616 .getroot = nfs4_proc_get_root,
9617 .submount = nfs4_submount,
9618 .try_mount = nfs4_try_mount,
9619 .getattr = nfs4_proc_getattr,
9620 .setattr = nfs4_proc_setattr,
9621 .lookup = nfs4_proc_lookup,
9622 .lookupp = nfs4_proc_lookupp,
9623 .access = nfs4_proc_access,
9624 .readlink = nfs4_proc_readlink,
9625 .create = nfs4_proc_create,
9626 .remove = nfs4_proc_remove,
9627 .unlink_setup = nfs4_proc_unlink_setup,
9628 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
9629 .unlink_done = nfs4_proc_unlink_done,
9630 .rename_setup = nfs4_proc_rename_setup,
9631 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
9632 .rename_done = nfs4_proc_rename_done,
9633 .link = nfs4_proc_link,
9634 .symlink = nfs4_proc_symlink,
9635 .mkdir = nfs4_proc_mkdir,
9636 .rmdir = nfs4_proc_rmdir,
9637 .readdir = nfs4_proc_readdir,
9638 .mknod = nfs4_proc_mknod,
9639 .statfs = nfs4_proc_statfs,
9640 .fsinfo = nfs4_proc_fsinfo,
9641 .pathconf = nfs4_proc_pathconf,
9642 .set_capabilities = nfs4_server_capabilities,
9643 .decode_dirent = nfs4_decode_dirent,
9644 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
9645 .read_setup = nfs4_proc_read_setup,
9646 .read_done = nfs4_read_done,
9647 .write_setup = nfs4_proc_write_setup,
9648 .write_done = nfs4_write_done,
9649 .commit_setup = nfs4_proc_commit_setup,
9650 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
9651 .commit_done = nfs4_commit_done,
9652 .lock = nfs4_proc_lock,
9653 .clear_acl_cache = nfs4_zap_acl_attr,
9654 .close_context = nfs4_close_context,
9655 .open_context = nfs4_atomic_open,
9656 .have_delegation = nfs4_have_delegation,
9657 .alloc_client = nfs4_alloc_client,
9658 .init_client = nfs4_init_client,
9659 .free_client = nfs4_free_client,
9660 .create_server = nfs4_create_server,
9661 .clone_server = nfs_clone_server,
9662 };
9663
9664 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
9665 .name = XATTR_NAME_NFSV4_ACL,
9666 .list = nfs4_xattr_list_nfs4_acl,
9667 .get = nfs4_xattr_get_nfs4_acl,
9668 .set = nfs4_xattr_set_nfs4_acl,
9669 };
9670
9671 const struct xattr_handler *nfs4_xattr_handlers[] = {
9672 &nfs4_xattr_nfs4_acl_handler,
9673 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
9674 &nfs4_xattr_nfs4_label_handler,
9675 #endif
9676 NULL
9677 };
9678
9679 /*
9680 * Local variables:
9681 * c-basic-offset: 8
9682 * End:
9683 */
Linux with added FPC-III support