1 /*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #include <linux/mm.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/ratelimit.h>
43 #include <linux/printk.h>
44 #include <linux/slab.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfs.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/nfs_page.h>
50 #include <linux/nfs_mount.h>
51 #include <linux/namei.h>
52 #include <linux/mount.h>
53 #include <linux/module.h>
54 #include <linux/xattr.h>
55 #include <linux/utsname.h>
56 #include <linux/freezer.h>
57 #include <linux/iversion.h>
58
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "sysfs.h"
67 #include "nfs4idmap.h"
68 #include "nfs4session.h"
69 #include "fscache.h"
70 #include "nfs42.h"
71
72 #include "nfs4trace.h"
73
74 #define NFSDBG_FACILITY NFSDBG_PROC
75
76 #define NFS4_BITMASK_SZ 3
77
78 #define NFS4_POLL_RETRY_MIN (HZ/10)
79 #define NFS4_POLL_RETRY_MAX (15*HZ)
80
81 /* file attributes which can be mapped to nfs attributes */
82 #define NFS4_VALID_ATTRS (ATTR_MODE \
83 | ATTR_UID \
84 | ATTR_GID \
85 | ATTR_SIZE \
86 | ATTR_ATIME \
87 | ATTR_MTIME \
88 | ATTR_CTIME \
89 | ATTR_ATIME_SET \
90 | ATTR_MTIME_SET)
91
92 struct nfs4_opendata;
93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
97 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
98 struct nfs_fattr *fattr, struct iattr *sattr,
99 struct nfs_open_context *ctx, struct nfs4_label *ilabel,
100 struct nfs4_label *olabel);
101 #ifdef CONFIG_NFS_V4_1
102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
103 const struct cred *cred,
104 struct nfs4_slot *slot,
105 bool is_privileged);
106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
107 const struct cred *);
108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
109 const struct cred *, bool);
110 #endif
111 static void nfs4_bitmask_set(__u32 bitmask[NFS4_BITMASK_SZ],
112 const __u32 *src, struct inode *inode,
113 struct nfs_server *server,
114 struct nfs4_label *label);
115
116 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
117 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)118 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
119 struct iattr *sattr, struct nfs4_label *label)
120 {
121 int err;
122
123 if (label == NULL)
124 return NULL;
125
126 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
127 return NULL;
128
129 err = security_dentry_init_security(dentry, sattr->ia_mode,
130 &dentry->d_name, (void **)&label->label, &label->len);
131 if (err == 0)
132 return label;
133
134 return NULL;
135 }
136 static inline void
nfs4_label_release_security(struct nfs4_label * label)137 nfs4_label_release_security(struct nfs4_label *label)
138 {
139 if (label)
140 security_release_secctx(label->label, label->len);
141 }
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)142 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
143 {
144 if (label)
145 return server->attr_bitmask;
146
147 return server->attr_bitmask_nl;
148 }
149 #else
150 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * l)151 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
152 struct iattr *sattr, struct nfs4_label *l)
153 { return NULL; }
154 static inline void
nfs4_label_release_security(struct nfs4_label * label)155 nfs4_label_release_security(struct nfs4_label *label)
156 { return; }
157 static inline u32 *
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)158 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
159 { return server->attr_bitmask; }
160 #endif
161
162 /* Prevent leaks of NFSv4 errors into userland */
nfs4_map_errors(int err)163 static int nfs4_map_errors(int err)
164 {
165 if (err >= -1000)
166 return err;
167 switch (err) {
168 case -NFS4ERR_RESOURCE:
169 case -NFS4ERR_LAYOUTTRYLATER:
170 case -NFS4ERR_RECALLCONFLICT:
171 return -EREMOTEIO;
172 case -NFS4ERR_WRONGSEC:
173 case -NFS4ERR_WRONG_CRED:
174 return -EPERM;
175 case -NFS4ERR_BADOWNER:
176 case -NFS4ERR_BADNAME:
177 return -EINVAL;
178 case -NFS4ERR_SHARE_DENIED:
179 return -EACCES;
180 case -NFS4ERR_MINOR_VERS_MISMATCH:
181 return -EPROTONOSUPPORT;
182 case -NFS4ERR_FILE_OPEN:
183 return -EBUSY;
184 case -NFS4ERR_NOT_SAME:
185 return -ENOTSYNC;
186 default:
187 dprintk("%s could not handle NFSv4 error %d\n",
188 __func__, -err);
189 break;
190 }
191 return -EIO;
192 }
193
194 /*
195 * This is our standard bitmap for GETATTR requests.
196 */
197 const u32 nfs4_fattr_bitmap[3] = {
198 FATTR4_WORD0_TYPE
199 | FATTR4_WORD0_CHANGE
200 | FATTR4_WORD0_SIZE
201 | FATTR4_WORD0_FSID
202 | FATTR4_WORD0_FILEID,
203 FATTR4_WORD1_MODE
204 | FATTR4_WORD1_NUMLINKS
205 | FATTR4_WORD1_OWNER
206 | FATTR4_WORD1_OWNER_GROUP
207 | FATTR4_WORD1_RAWDEV
208 | FATTR4_WORD1_SPACE_USED
209 | FATTR4_WORD1_TIME_ACCESS
210 | FATTR4_WORD1_TIME_METADATA
211 | FATTR4_WORD1_TIME_MODIFY
212 | FATTR4_WORD1_MOUNTED_ON_FILEID,
213 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
214 FATTR4_WORD2_SECURITY_LABEL
215 #endif
216 };
217
218 static const u32 nfs4_pnfs_open_bitmap[3] = {
219 FATTR4_WORD0_TYPE
220 | FATTR4_WORD0_CHANGE
221 | FATTR4_WORD0_SIZE
222 | FATTR4_WORD0_FSID
223 | FATTR4_WORD0_FILEID,
224 FATTR4_WORD1_MODE
225 | FATTR4_WORD1_NUMLINKS
226 | FATTR4_WORD1_OWNER
227 | FATTR4_WORD1_OWNER_GROUP
228 | FATTR4_WORD1_RAWDEV
229 | FATTR4_WORD1_SPACE_USED
230 | FATTR4_WORD1_TIME_ACCESS
231 | FATTR4_WORD1_TIME_METADATA
232 | FATTR4_WORD1_TIME_MODIFY,
233 FATTR4_WORD2_MDSTHRESHOLD
234 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
235 | FATTR4_WORD2_SECURITY_LABEL
236 #endif
237 };
238
239 static const u32 nfs4_open_noattr_bitmap[3] = {
240 FATTR4_WORD0_TYPE
241 | FATTR4_WORD0_FILEID,
242 };
243
244 const u32 nfs4_statfs_bitmap[3] = {
245 FATTR4_WORD0_FILES_AVAIL
246 | FATTR4_WORD0_FILES_FREE
247 | FATTR4_WORD0_FILES_TOTAL,
248 FATTR4_WORD1_SPACE_AVAIL
249 | FATTR4_WORD1_SPACE_FREE
250 | FATTR4_WORD1_SPACE_TOTAL
251 };
252
253 const u32 nfs4_pathconf_bitmap[3] = {
254 FATTR4_WORD0_MAXLINK
255 | FATTR4_WORD0_MAXNAME,
256 0
257 };
258
259 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
260 | FATTR4_WORD0_MAXREAD
261 | FATTR4_WORD0_MAXWRITE
262 | FATTR4_WORD0_LEASE_TIME,
263 FATTR4_WORD1_TIME_DELTA
264 | FATTR4_WORD1_FS_LAYOUT_TYPES,
265 FATTR4_WORD2_LAYOUT_BLKSIZE
266 | FATTR4_WORD2_CLONE_BLKSIZE
267 | FATTR4_WORD2_CHANGE_ATTR_TYPE
268 | FATTR4_WORD2_XATTR_SUPPORT
269 };
270
271 const u32 nfs4_fs_locations_bitmap[3] = {
272 FATTR4_WORD0_CHANGE
273 | FATTR4_WORD0_SIZE
274 | FATTR4_WORD0_FSID
275 | FATTR4_WORD0_FILEID
276 | FATTR4_WORD0_FS_LOCATIONS,
277 FATTR4_WORD1_OWNER
278 | FATTR4_WORD1_OWNER_GROUP
279 | FATTR4_WORD1_RAWDEV
280 | FATTR4_WORD1_SPACE_USED
281 | FATTR4_WORD1_TIME_ACCESS
282 | FATTR4_WORD1_TIME_METADATA
283 | FATTR4_WORD1_TIME_MODIFY
284 | FATTR4_WORD1_MOUNTED_ON_FILEID,
285 };
286
nfs4_bitmap_copy_adjust(__u32 * dst,const __u32 * src,struct inode * inode,unsigned long flags)287 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
288 struct inode *inode, unsigned long flags)
289 {
290 unsigned long cache_validity;
291
292 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
293 if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
294 return;
295
296 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
297
298 /* Remove the attributes over which we have full control */
299 dst[1] &= ~FATTR4_WORD1_RAWDEV;
300 if (!(cache_validity & NFS_INO_INVALID_SIZE))
301 dst[0] &= ~FATTR4_WORD0_SIZE;
302
303 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
304 dst[0] &= ~FATTR4_WORD0_CHANGE;
305
306 if (!(cache_validity & NFS_INO_INVALID_MODE))
307 dst[1] &= ~FATTR4_WORD1_MODE;
308 if (!(cache_validity & NFS_INO_INVALID_OTHER))
309 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
310 }
311
nfs4_setup_readdir(u64 cookie,__be32 * verifier,struct dentry * dentry,struct nfs4_readdir_arg * readdir)312 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
313 struct nfs4_readdir_arg *readdir)
314 {
315 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
316 __be32 *start, *p;
317
318 if (cookie > 2) {
319 readdir->cookie = cookie;
320 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
321 return;
322 }
323
324 readdir->cookie = 0;
325 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
326 if (cookie == 2)
327 return;
328
329 /*
330 * NFSv4 servers do not return entries for '.' and '..'
331 * Therefore, we fake these entries here. We let '.'
332 * have cookie 0 and '..' have cookie 1. Note that
333 * when talking to the server, we always send cookie 0
334 * instead of 1 or 2.
335 */
336 start = p = kmap_atomic(*readdir->pages);
337
338 if (cookie == 0) {
339 *p++ = xdr_one; /* next */
340 *p++ = xdr_zero; /* cookie, first word */
341 *p++ = xdr_one; /* cookie, second word */
342 *p++ = xdr_one; /* entry len */
343 memcpy(p, ".\0\0\0", 4); /* entry */
344 p++;
345 *p++ = xdr_one; /* bitmap length */
346 *p++ = htonl(attrs); /* bitmap */
347 *p++ = htonl(12); /* attribute buffer length */
348 *p++ = htonl(NF4DIR);
349 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
350 }
351
352 *p++ = xdr_one; /* next */
353 *p++ = xdr_zero; /* cookie, first word */
354 *p++ = xdr_two; /* cookie, second word */
355 *p++ = xdr_two; /* entry len */
356 memcpy(p, "..\0\0", 4); /* entry */
357 p++;
358 *p++ = xdr_one; /* bitmap length */
359 *p++ = htonl(attrs); /* bitmap */
360 *p++ = htonl(12); /* attribute buffer length */
361 *p++ = htonl(NF4DIR);
362 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
363
364 readdir->pgbase = (char *)p - (char *)start;
365 readdir->count -= readdir->pgbase;
366 kunmap_atomic(start);
367 }
368
nfs4_test_and_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)369 static void nfs4_test_and_free_stateid(struct nfs_server *server,
370 nfs4_stateid *stateid,
371 const struct cred *cred)
372 {
373 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
374
375 ops->test_and_free_expired(server, stateid, cred);
376 }
377
__nfs4_free_revoked_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)378 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
379 nfs4_stateid *stateid,
380 const struct cred *cred)
381 {
382 stateid->type = NFS4_REVOKED_STATEID_TYPE;
383 nfs4_test_and_free_stateid(server, stateid, cred);
384 }
385
nfs4_free_revoked_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)386 static void nfs4_free_revoked_stateid(struct nfs_server *server,
387 const nfs4_stateid *stateid,
388 const struct cred *cred)
389 {
390 nfs4_stateid tmp;
391
392 nfs4_stateid_copy(&tmp, stateid);
393 __nfs4_free_revoked_stateid(server, &tmp, cred);
394 }
395
nfs4_update_delay(long * timeout)396 static long nfs4_update_delay(long *timeout)
397 {
398 long ret;
399 if (!timeout)
400 return NFS4_POLL_RETRY_MAX;
401 if (*timeout <= 0)
402 *timeout = NFS4_POLL_RETRY_MIN;
403 if (*timeout > NFS4_POLL_RETRY_MAX)
404 *timeout = NFS4_POLL_RETRY_MAX;
405 ret = *timeout;
406 *timeout <<= 1;
407 return ret;
408 }
409
nfs4_delay_killable(long * timeout)410 static int nfs4_delay_killable(long *timeout)
411 {
412 might_sleep();
413
414 freezable_schedule_timeout_killable_unsafe(
415 nfs4_update_delay(timeout));
416 if (!__fatal_signal_pending(current))
417 return 0;
418 return -EINTR;
419 }
420
nfs4_delay_interruptible(long * timeout)421 static int nfs4_delay_interruptible(long *timeout)
422 {
423 might_sleep();
424
425 freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout));
426 if (!signal_pending(current))
427 return 0;
428 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
429 }
430
nfs4_delay(long * timeout,bool interruptible)431 static int nfs4_delay(long *timeout, bool interruptible)
432 {
433 if (interruptible)
434 return nfs4_delay_interruptible(timeout);
435 return nfs4_delay_killable(timeout);
436 }
437
438 static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid * stateid)439 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
440 {
441 if (!stateid)
442 return NULL;
443 switch (stateid->type) {
444 case NFS4_OPEN_STATEID_TYPE:
445 case NFS4_LOCK_STATEID_TYPE:
446 case NFS4_DELEGATION_STATEID_TYPE:
447 return stateid;
448 default:
449 break;
450 }
451 return NULL;
452 }
453
454 /* This is the error handling routine for processes that are allowed
455 * to sleep.
456 */
nfs4_do_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)457 static int nfs4_do_handle_exception(struct nfs_server *server,
458 int errorcode, struct nfs4_exception *exception)
459 {
460 struct nfs_client *clp = server->nfs_client;
461 struct nfs4_state *state = exception->state;
462 const nfs4_stateid *stateid;
463 struct inode *inode = exception->inode;
464 int ret = errorcode;
465
466 exception->delay = 0;
467 exception->recovering = 0;
468 exception->retry = 0;
469
470 stateid = nfs4_recoverable_stateid(exception->stateid);
471 if (stateid == NULL && state != NULL)
472 stateid = nfs4_recoverable_stateid(&state->stateid);
473
474 switch(errorcode) {
475 case 0:
476 return 0;
477 case -NFS4ERR_BADHANDLE:
478 case -ESTALE:
479 if (inode != NULL && S_ISREG(inode->i_mode))
480 pnfs_destroy_layout(NFS_I(inode));
481 break;
482 case -NFS4ERR_DELEG_REVOKED:
483 case -NFS4ERR_ADMIN_REVOKED:
484 case -NFS4ERR_EXPIRED:
485 case -NFS4ERR_BAD_STATEID:
486 case -NFS4ERR_PARTNER_NO_AUTH:
487 if (inode != NULL && stateid != NULL) {
488 nfs_inode_find_state_and_recover(inode,
489 stateid);
490 goto wait_on_recovery;
491 }
492 fallthrough;
493 case -NFS4ERR_OPENMODE:
494 if (inode) {
495 int err;
496
497 err = nfs_async_inode_return_delegation(inode,
498 stateid);
499 if (err == 0)
500 goto wait_on_recovery;
501 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
502 exception->retry = 1;
503 break;
504 }
505 }
506 if (state == NULL)
507 break;
508 ret = nfs4_schedule_stateid_recovery(server, state);
509 if (ret < 0)
510 break;
511 goto wait_on_recovery;
512 case -NFS4ERR_STALE_STATEID:
513 case -NFS4ERR_STALE_CLIENTID:
514 nfs4_schedule_lease_recovery(clp);
515 goto wait_on_recovery;
516 case -NFS4ERR_MOVED:
517 ret = nfs4_schedule_migration_recovery(server);
518 if (ret < 0)
519 break;
520 goto wait_on_recovery;
521 case -NFS4ERR_LEASE_MOVED:
522 nfs4_schedule_lease_moved_recovery(clp);
523 goto wait_on_recovery;
524 #if defined(CONFIG_NFS_V4_1)
525 case -NFS4ERR_BADSESSION:
526 case -NFS4ERR_BADSLOT:
527 case -NFS4ERR_BAD_HIGH_SLOT:
528 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
529 case -NFS4ERR_DEADSESSION:
530 case -NFS4ERR_SEQ_FALSE_RETRY:
531 case -NFS4ERR_SEQ_MISORDERED:
532 /* Handled in nfs41_sequence_process() */
533 goto wait_on_recovery;
534 #endif /* defined(CONFIG_NFS_V4_1) */
535 case -NFS4ERR_FILE_OPEN:
536 if (exception->timeout > HZ) {
537 /* We have retried a decent amount, time to
538 * fail
539 */
540 ret = -EBUSY;
541 break;
542 }
543 fallthrough;
544 case -NFS4ERR_DELAY:
545 nfs_inc_server_stats(server, NFSIOS_DELAY);
546 fallthrough;
547 case -NFS4ERR_GRACE:
548 case -NFS4ERR_LAYOUTTRYLATER:
549 case -NFS4ERR_RECALLCONFLICT:
550 exception->delay = 1;
551 return 0;
552
553 case -NFS4ERR_RETRY_UNCACHED_REP:
554 case -NFS4ERR_OLD_STATEID:
555 exception->retry = 1;
556 break;
557 case -NFS4ERR_BADOWNER:
558 /* The following works around a Linux server bug! */
559 case -NFS4ERR_BADNAME:
560 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
561 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
562 exception->retry = 1;
563 printk(KERN_WARNING "NFS: v4 server %s "
564 "does not accept raw "
565 "uid/gids. "
566 "Reenabling the idmapper.\n",
567 server->nfs_client->cl_hostname);
568 }
569 }
570 /* We failed to handle the error */
571 return nfs4_map_errors(ret);
572 wait_on_recovery:
573 exception->recovering = 1;
574 return 0;
575 }
576
577 /* This is the error handling routine for processes that are allowed
578 * to sleep.
579 */
nfs4_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)580 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
581 {
582 struct nfs_client *clp = server->nfs_client;
583 int ret;
584
585 ret = nfs4_do_handle_exception(server, errorcode, exception);
586 if (exception->delay) {
587 ret = nfs4_delay(&exception->timeout,
588 exception->interruptible);
589 goto out_retry;
590 }
591 if (exception->recovering) {
592 ret = nfs4_wait_clnt_recover(clp);
593 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
594 return -EIO;
595 goto out_retry;
596 }
597 return ret;
598 out_retry:
599 if (ret == 0)
600 exception->retry = 1;
601 return ret;
602 }
603
604 static int
nfs4_async_handle_exception(struct rpc_task * task,struct nfs_server * server,int errorcode,struct nfs4_exception * exception)605 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
606 int errorcode, struct nfs4_exception *exception)
607 {
608 struct nfs_client *clp = server->nfs_client;
609 int ret;
610
611 ret = nfs4_do_handle_exception(server, errorcode, exception);
612 if (exception->delay) {
613 rpc_delay(task, nfs4_update_delay(&exception->timeout));
614 goto out_retry;
615 }
616 if (exception->recovering) {
617 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
618 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
619 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
620 goto out_retry;
621 }
622 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
623 ret = -EIO;
624 return ret;
625 out_retry:
626 if (ret == 0) {
627 exception->retry = 1;
628 /*
629 * For NFS4ERR_MOVED, the client transport will need to
630 * be recomputed after migration recovery has completed.
631 */
632 if (errorcode == -NFS4ERR_MOVED)
633 rpc_task_release_transport(task);
634 }
635 return ret;
636 }
637
638 int
nfs4_async_handle_error(struct rpc_task * task,struct nfs_server * server,struct nfs4_state * state,long * timeout)639 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
640 struct nfs4_state *state, long *timeout)
641 {
642 struct nfs4_exception exception = {
643 .state = state,
644 };
645
646 if (task->tk_status >= 0)
647 return 0;
648 if (timeout)
649 exception.timeout = *timeout;
650 task->tk_status = nfs4_async_handle_exception(task, server,
651 task->tk_status,
652 &exception);
653 if (exception.delay && timeout)
654 *timeout = exception.timeout;
655 if (exception.retry)
656 return -EAGAIN;
657 return 0;
658 }
659
660 /*
661 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
662 * or 'false' otherwise.
663 */
_nfs4_is_integrity_protected(struct nfs_client * clp)664 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
665 {
666 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
667 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
668 }
669
do_renew_lease(struct nfs_client * clp,unsigned long timestamp)670 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
671 {
672 spin_lock(&clp->cl_lock);
673 if (time_before(clp->cl_last_renewal,timestamp))
674 clp->cl_last_renewal = timestamp;
675 spin_unlock(&clp->cl_lock);
676 }
677
renew_lease(const struct nfs_server * server,unsigned long timestamp)678 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
679 {
680 struct nfs_client *clp = server->nfs_client;
681
682 if (!nfs4_has_session(clp))
683 do_renew_lease(clp, timestamp);
684 }
685
686 struct nfs4_call_sync_data {
687 const struct nfs_server *seq_server;
688 struct nfs4_sequence_args *seq_args;
689 struct nfs4_sequence_res *seq_res;
690 };
691
nfs4_init_sequence(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply,int privileged)692 void nfs4_init_sequence(struct nfs4_sequence_args *args,
693 struct nfs4_sequence_res *res, int cache_reply,
694 int privileged)
695 {
696 args->sa_slot = NULL;
697 args->sa_cache_this = cache_reply;
698 args->sa_privileged = privileged;
699
700 res->sr_slot = NULL;
701 }
702
nfs40_sequence_free_slot(struct nfs4_sequence_res * res)703 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
704 {
705 struct nfs4_slot *slot = res->sr_slot;
706 struct nfs4_slot_table *tbl;
707
708 tbl = slot->table;
709 spin_lock(&tbl->slot_tbl_lock);
710 if (!nfs41_wake_and_assign_slot(tbl, slot))
711 nfs4_free_slot(tbl, slot);
712 spin_unlock(&tbl->slot_tbl_lock);
713
714 res->sr_slot = NULL;
715 }
716
nfs40_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)717 static int nfs40_sequence_done(struct rpc_task *task,
718 struct nfs4_sequence_res *res)
719 {
720 if (res->sr_slot != NULL)
721 nfs40_sequence_free_slot(res);
722 return 1;
723 }
724
725 #if defined(CONFIG_NFS_V4_1)
726
nfs41_release_slot(struct nfs4_slot * slot)727 static void nfs41_release_slot(struct nfs4_slot *slot)
728 {
729 struct nfs4_session *session;
730 struct nfs4_slot_table *tbl;
731 bool send_new_highest_used_slotid = false;
732
733 if (!slot)
734 return;
735 tbl = slot->table;
736 session = tbl->session;
737
738 /* Bump the slot sequence number */
739 if (slot->seq_done)
740 slot->seq_nr++;
741 slot->seq_done = 0;
742
743 spin_lock(&tbl->slot_tbl_lock);
744 /* Be nice to the server: try to ensure that the last transmitted
745 * value for highest_user_slotid <= target_highest_slotid
746 */
747 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
748 send_new_highest_used_slotid = true;
749
750 if (nfs41_wake_and_assign_slot(tbl, slot)) {
751 send_new_highest_used_slotid = false;
752 goto out_unlock;
753 }
754 nfs4_free_slot(tbl, slot);
755
756 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
757 send_new_highest_used_slotid = false;
758 out_unlock:
759 spin_unlock(&tbl->slot_tbl_lock);
760 if (send_new_highest_used_slotid)
761 nfs41_notify_server(session->clp);
762 if (waitqueue_active(&tbl->slot_waitq))
763 wake_up_all(&tbl->slot_waitq);
764 }
765
nfs41_sequence_free_slot(struct nfs4_sequence_res * res)766 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
767 {
768 nfs41_release_slot(res->sr_slot);
769 res->sr_slot = NULL;
770 }
771
nfs4_slot_sequence_record_sent(struct nfs4_slot * slot,u32 seqnr)772 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
773 u32 seqnr)
774 {
775 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
776 slot->seq_nr_highest_sent = seqnr;
777 }
nfs4_slot_sequence_acked(struct nfs4_slot * slot,u32 seqnr)778 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot,
779 u32 seqnr)
780 {
781 slot->seq_nr_highest_sent = seqnr;
782 slot->seq_nr_last_acked = seqnr;
783 }
784
nfs4_probe_sequence(struct nfs_client * client,const struct cred * cred,struct nfs4_slot * slot)785 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
786 struct nfs4_slot *slot)
787 {
788 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
789 if (!IS_ERR(task))
790 rpc_put_task_async(task);
791 }
792
nfs41_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)793 static int nfs41_sequence_process(struct rpc_task *task,
794 struct nfs4_sequence_res *res)
795 {
796 struct nfs4_session *session;
797 struct nfs4_slot *slot = res->sr_slot;
798 struct nfs_client *clp;
799 int status;
800 int ret = 1;
801
802 if (slot == NULL)
803 goto out_noaction;
804 /* don't increment the sequence number if the task wasn't sent */
805 if (!RPC_WAS_SENT(task) || slot->seq_done)
806 goto out;
807
808 session = slot->table->session;
809 clp = session->clp;
810
811 trace_nfs4_sequence_done(session, res);
812
813 status = res->sr_status;
814 if (task->tk_status == -NFS4ERR_DEADSESSION)
815 status = -NFS4ERR_DEADSESSION;
816
817 /* Check the SEQUENCE operation status */
818 switch (status) {
819 case 0:
820 /* Mark this sequence number as having been acked */
821 nfs4_slot_sequence_acked(slot, slot->seq_nr);
822 /* Update the slot's sequence and clientid lease timer */
823 slot->seq_done = 1;
824 do_renew_lease(clp, res->sr_timestamp);
825 /* Check sequence flags */
826 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
827 !!slot->privileged);
828 nfs41_update_target_slotid(slot->table, slot, res);
829 break;
830 case 1:
831 /*
832 * sr_status remains 1 if an RPC level error occurred.
833 * The server may or may not have processed the sequence
834 * operation..
835 */
836 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
837 slot->seq_done = 1;
838 goto out;
839 case -NFS4ERR_DELAY:
840 /* The server detected a resend of the RPC call and
841 * returned NFS4ERR_DELAY as per Section 2.10.6.2
842 * of RFC5661.
843 */
844 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
845 __func__,
846 slot->slot_nr,
847 slot->seq_nr);
848 nfs4_slot_sequence_acked(slot, slot->seq_nr);
849 goto out_retry;
850 case -NFS4ERR_RETRY_UNCACHED_REP:
851 case -NFS4ERR_SEQ_FALSE_RETRY:
852 /*
853 * The server thinks we tried to replay a request.
854 * Retry the call after bumping the sequence ID.
855 */
856 nfs4_slot_sequence_acked(slot, slot->seq_nr);
857 goto retry_new_seq;
858 case -NFS4ERR_BADSLOT:
859 /*
860 * The slot id we used was probably retired. Try again
861 * using a different slot id.
862 */
863 if (slot->slot_nr < slot->table->target_highest_slotid)
864 goto session_recover;
865 goto retry_nowait;
866 case -NFS4ERR_SEQ_MISORDERED:
867 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
868 /*
869 * Were one or more calls using this slot interrupted?
870 * If the server never received the request, then our
871 * transmitted slot sequence number may be too high. However,
872 * if the server did receive the request then it might
873 * accidentally give us a reply with a mismatched operation.
874 * We can sort this out by sending a lone sequence operation
875 * to the server on the same slot.
876 */
877 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
878 slot->seq_nr--;
879 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
880 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
881 res->sr_slot = NULL;
882 }
883 goto retry_nowait;
884 }
885 /*
886 * RFC5661:
887 * A retry might be sent while the original request is
888 * still in progress on the replier. The replier SHOULD
889 * deal with the issue by returning NFS4ERR_DELAY as the
890 * reply to SEQUENCE or CB_SEQUENCE operation, but
891 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
892 *
893 * Restart the search after a delay.
894 */
895 slot->seq_nr = slot->seq_nr_highest_sent;
896 goto out_retry;
897 case -NFS4ERR_BADSESSION:
898 case -NFS4ERR_DEADSESSION:
899 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
900 goto session_recover;
901 default:
902 /* Just update the slot sequence no. */
903 slot->seq_done = 1;
904 }
905 out:
906 /* The session may be reset by one of the error handlers. */
907 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
908 out_noaction:
909 return ret;
910 session_recover:
911 nfs4_schedule_session_recovery(session, status);
912 dprintk("%s ERROR: %d Reset session\n", __func__, status);
913 nfs41_sequence_free_slot(res);
914 goto out;
915 retry_new_seq:
916 ++slot->seq_nr;
917 retry_nowait:
918 if (rpc_restart_call_prepare(task)) {
919 nfs41_sequence_free_slot(res);
920 task->tk_status = 0;
921 ret = 0;
922 }
923 goto out;
924 out_retry:
925 if (!rpc_restart_call(task))
926 goto out;
927 rpc_delay(task, NFS4_POLL_RETRY_MAX);
928 return 0;
929 }
930
nfs41_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)931 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
932 {
933 if (!nfs41_sequence_process(task, res))
934 return 0;
935 if (res->sr_slot != NULL)
936 nfs41_sequence_free_slot(res);
937 return 1;
938
939 }
940 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
941
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)942 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
943 {
944 if (res->sr_slot == NULL)
945 return 1;
946 if (res->sr_slot->table->session != NULL)
947 return nfs41_sequence_process(task, res);
948 return nfs40_sequence_done(task, res);
949 }
950
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)951 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
952 {
953 if (res->sr_slot != NULL) {
954 if (res->sr_slot->table->session != NULL)
955 nfs41_sequence_free_slot(res);
956 else
957 nfs40_sequence_free_slot(res);
958 }
959 }
960
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)961 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
962 {
963 if (res->sr_slot == NULL)
964 return 1;
965 if (!res->sr_slot->table->session)
966 return nfs40_sequence_done(task, res);
967 return nfs41_sequence_done(task, res);
968 }
969 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
970
nfs41_call_sync_prepare(struct rpc_task * task,void * calldata)971 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
972 {
973 struct nfs4_call_sync_data *data = calldata;
974
975 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
976
977 nfs4_setup_sequence(data->seq_server->nfs_client,
978 data->seq_args, data->seq_res, task);
979 }
980
nfs41_call_sync_done(struct rpc_task * task,void * calldata)981 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
982 {
983 struct nfs4_call_sync_data *data = calldata;
984
985 nfs41_sequence_done(task, data->seq_res);
986 }
987
988 static const struct rpc_call_ops nfs41_call_sync_ops = {
989 .rpc_call_prepare = nfs41_call_sync_prepare,
990 .rpc_call_done = nfs41_call_sync_done,
991 };
992
993 #else /* !CONFIG_NFS_V4_1 */
994
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)995 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
996 {
997 return nfs40_sequence_done(task, res);
998 }
999
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1000 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1001 {
1002 if (res->sr_slot != NULL)
1003 nfs40_sequence_free_slot(res);
1004 }
1005
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1006 int nfs4_sequence_done(struct rpc_task *task,
1007 struct nfs4_sequence_res *res)
1008 {
1009 return nfs40_sequence_done(task, res);
1010 }
1011 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1012
1013 #endif /* !CONFIG_NFS_V4_1 */
1014
nfs41_sequence_res_init(struct nfs4_sequence_res * res)1015 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1016 {
1017 res->sr_timestamp = jiffies;
1018 res->sr_status_flags = 0;
1019 res->sr_status = 1;
1020 }
1021
1022 static
nfs4_sequence_attach_slot(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct nfs4_slot * slot)1023 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1024 struct nfs4_sequence_res *res,
1025 struct nfs4_slot *slot)
1026 {
1027 if (!slot)
1028 return;
1029 slot->privileged = args->sa_privileged ? 1 : 0;
1030 args->sa_slot = slot;
1031
1032 res->sr_slot = slot;
1033 }
1034
nfs4_setup_sequence(struct nfs_client * client,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct rpc_task * task)1035 int nfs4_setup_sequence(struct nfs_client *client,
1036 struct nfs4_sequence_args *args,
1037 struct nfs4_sequence_res *res,
1038 struct rpc_task *task)
1039 {
1040 struct nfs4_session *session = nfs4_get_session(client);
1041 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
1042 struct nfs4_slot *slot;
1043
1044 /* slot already allocated? */
1045 if (res->sr_slot != NULL)
1046 goto out_start;
1047
1048 if (session)
1049 tbl = &session->fc_slot_table;
1050
1051 spin_lock(&tbl->slot_tbl_lock);
1052 /* The state manager will wait until the slot table is empty */
1053 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1054 goto out_sleep;
1055
1056 slot = nfs4_alloc_slot(tbl);
1057 if (IS_ERR(slot)) {
1058 if (slot == ERR_PTR(-ENOMEM))
1059 goto out_sleep_timeout;
1060 goto out_sleep;
1061 }
1062 spin_unlock(&tbl->slot_tbl_lock);
1063
1064 nfs4_sequence_attach_slot(args, res, slot);
1065
1066 trace_nfs4_setup_sequence(session, args);
1067 out_start:
1068 nfs41_sequence_res_init(res);
1069 rpc_call_start(task);
1070 return 0;
1071 out_sleep_timeout:
1072 /* Try again in 1/4 second */
1073 if (args->sa_privileged)
1074 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1075 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1076 else
1077 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1078 NULL, jiffies + (HZ >> 2));
1079 spin_unlock(&tbl->slot_tbl_lock);
1080 return -EAGAIN;
1081 out_sleep:
1082 if (args->sa_privileged)
1083 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1084 RPC_PRIORITY_PRIVILEGED);
1085 else
1086 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1087 spin_unlock(&tbl->slot_tbl_lock);
1088 return -EAGAIN;
1089 }
1090 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1091
nfs40_call_sync_prepare(struct rpc_task * task,void * calldata)1092 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1093 {
1094 struct nfs4_call_sync_data *data = calldata;
1095 nfs4_setup_sequence(data->seq_server->nfs_client,
1096 data->seq_args, data->seq_res, task);
1097 }
1098
nfs40_call_sync_done(struct rpc_task * task,void * calldata)1099 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1100 {
1101 struct nfs4_call_sync_data *data = calldata;
1102 nfs4_sequence_done(task, data->seq_res);
1103 }
1104
1105 static const struct rpc_call_ops nfs40_call_sync_ops = {
1106 .rpc_call_prepare = nfs40_call_sync_prepare,
1107 .rpc_call_done = nfs40_call_sync_done,
1108 };
1109
nfs4_call_sync_custom(struct rpc_task_setup * task_setup)1110 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1111 {
1112 int ret;
1113 struct rpc_task *task;
1114
1115 task = rpc_run_task(task_setup);
1116 if (IS_ERR(task))
1117 return PTR_ERR(task);
1118
1119 ret = task->tk_status;
1120 rpc_put_task(task);
1121 return ret;
1122 }
1123
nfs4_do_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,unsigned short task_flags)1124 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1125 struct nfs_server *server,
1126 struct rpc_message *msg,
1127 struct nfs4_sequence_args *args,
1128 struct nfs4_sequence_res *res,
1129 unsigned short task_flags)
1130 {
1131 struct nfs_client *clp = server->nfs_client;
1132 struct nfs4_call_sync_data data = {
1133 .seq_server = server,
1134 .seq_args = args,
1135 .seq_res = res,
1136 };
1137 struct rpc_task_setup task_setup = {
1138 .rpc_client = clnt,
1139 .rpc_message = msg,
1140 .callback_ops = clp->cl_mvops->call_sync_ops,
1141 .callback_data = &data,
1142 .flags = task_flags,
1143 };
1144
1145 return nfs4_call_sync_custom(&task_setup);
1146 }
1147
nfs4_call_sync_sequence(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res)1148 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1149 struct nfs_server *server,
1150 struct rpc_message *msg,
1151 struct nfs4_sequence_args *args,
1152 struct nfs4_sequence_res *res)
1153 {
1154 return nfs4_do_call_sync(clnt, server, msg, args, res, 0);
1155 }
1156
1157
nfs4_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply)1158 int nfs4_call_sync(struct rpc_clnt *clnt,
1159 struct nfs_server *server,
1160 struct rpc_message *msg,
1161 struct nfs4_sequence_args *args,
1162 struct nfs4_sequence_res *res,
1163 int cache_reply)
1164 {
1165 nfs4_init_sequence(args, res, cache_reply, 0);
1166 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1167 }
1168
1169 static void
nfs4_inc_nlink_locked(struct inode * inode)1170 nfs4_inc_nlink_locked(struct inode *inode)
1171 {
1172 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1173 NFS_INO_INVALID_CTIME |
1174 NFS_INO_INVALID_NLINK);
1175 inc_nlink(inode);
1176 }
1177
1178 static void
nfs4_inc_nlink(struct inode * inode)1179 nfs4_inc_nlink(struct inode *inode)
1180 {
1181 spin_lock(&inode->i_lock);
1182 nfs4_inc_nlink_locked(inode);
1183 spin_unlock(&inode->i_lock);
1184 }
1185
1186 static void
nfs4_dec_nlink_locked(struct inode * inode)1187 nfs4_dec_nlink_locked(struct inode *inode)
1188 {
1189 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1190 NFS_INO_INVALID_CTIME |
1191 NFS_INO_INVALID_NLINK);
1192 drop_nlink(inode);
1193 }
1194
1195 static void
nfs4_update_changeattr_locked(struct inode * inode,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1196 nfs4_update_changeattr_locked(struct inode *inode,
1197 struct nfs4_change_info *cinfo,
1198 unsigned long timestamp, unsigned long cache_validity)
1199 {
1200 struct nfs_inode *nfsi = NFS_I(inode);
1201 u64 change_attr = inode_peek_iversion_raw(inode);
1202
1203 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1204
1205 switch (NFS_SERVER(inode)->change_attr_type) {
1206 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1207 break;
1208 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1209 if ((s64)(change_attr - cinfo->after) > 0)
1210 goto out;
1211 break;
1212 default:
1213 if ((s64)(change_attr - cinfo->after) >= 0)
1214 goto out;
1215 }
1216
1217 if (cinfo->atomic && cinfo->before == change_attr) {
1218 nfsi->attrtimeo_timestamp = jiffies;
1219 } else {
1220 if (S_ISDIR(inode->i_mode)) {
1221 cache_validity |= NFS_INO_INVALID_DATA;
1222 nfs_force_lookup_revalidate(inode);
1223 } else {
1224 if (!NFS_PROTO(inode)->have_delegation(inode,
1225 FMODE_READ))
1226 cache_validity |= NFS_INO_REVAL_PAGECACHE;
1227 }
1228
1229 if (cinfo->before != change_attr)
1230 cache_validity |= NFS_INO_INVALID_ACCESS |
1231 NFS_INO_INVALID_ACL |
1232 NFS_INO_INVALID_XATTR;
1233 }
1234 inode_set_iversion_raw(inode, cinfo->after);
1235 nfsi->read_cache_jiffies = timestamp;
1236 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1237 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1238 out:
1239 nfs_set_cache_invalid(inode, cache_validity);
1240 }
1241
1242 void
nfs4_update_changeattr(struct inode * dir,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1243 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1244 unsigned long timestamp, unsigned long cache_validity)
1245 {
1246 spin_lock(&dir->i_lock);
1247 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1248 spin_unlock(&dir->i_lock);
1249 }
1250
1251 struct nfs4_open_createattrs {
1252 struct nfs4_label *label;
1253 struct iattr *sattr;
1254 const __u32 verf[2];
1255 };
1256
nfs4_clear_cap_atomic_open_v1(struct nfs_server * server,int err,struct nfs4_exception * exception)1257 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1258 int err, struct nfs4_exception *exception)
1259 {
1260 if (err != -EINVAL)
1261 return false;
1262 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1263 return false;
1264 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1265 exception->retry = 1;
1266 return true;
1267 }
1268
_nfs4_ctx_to_accessmode(const struct nfs_open_context * ctx)1269 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1270 {
1271 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1272 }
1273
_nfs4_ctx_to_openmode(const struct nfs_open_context * ctx)1274 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1275 {
1276 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1277
1278 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1279 }
1280
1281 static u32
nfs4_map_atomic_open_share(struct nfs_server * server,fmode_t fmode,int openflags)1282 nfs4_map_atomic_open_share(struct nfs_server *server,
1283 fmode_t fmode, int openflags)
1284 {
1285 u32 res = 0;
1286
1287 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1288 case FMODE_READ:
1289 res = NFS4_SHARE_ACCESS_READ;
1290 break;
1291 case FMODE_WRITE:
1292 res = NFS4_SHARE_ACCESS_WRITE;
1293 break;
1294 case FMODE_READ|FMODE_WRITE:
1295 res = NFS4_SHARE_ACCESS_BOTH;
1296 }
1297 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1298 goto out;
1299 /* Want no delegation if we're using O_DIRECT */
1300 if (openflags & O_DIRECT)
1301 res |= NFS4_SHARE_WANT_NO_DELEG;
1302 out:
1303 return res;
1304 }
1305
1306 static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server * server,enum open_claim_type4 claim)1307 nfs4_map_atomic_open_claim(struct nfs_server *server,
1308 enum open_claim_type4 claim)
1309 {
1310 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1311 return claim;
1312 switch (claim) {
1313 default:
1314 return claim;
1315 case NFS4_OPEN_CLAIM_FH:
1316 return NFS4_OPEN_CLAIM_NULL;
1317 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1318 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1319 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1320 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1321 }
1322 }
1323
nfs4_init_opendata_res(struct nfs4_opendata * p)1324 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1325 {
1326 p->o_res.f_attr = &p->f_attr;
1327 p->o_res.f_label = p->f_label;
1328 p->o_res.seqid = p->o_arg.seqid;
1329 p->c_res.seqid = p->c_arg.seqid;
1330 p->o_res.server = p->o_arg.server;
1331 p->o_res.access_request = p->o_arg.access;
1332 nfs_fattr_init(&p->f_attr);
1333 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1334 }
1335
nfs4_opendata_alloc(struct dentry * dentry,struct nfs4_state_owner * sp,fmode_t fmode,int flags,const struct nfs4_open_createattrs * c,enum open_claim_type4 claim,gfp_t gfp_mask)1336 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1337 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1338 const struct nfs4_open_createattrs *c,
1339 enum open_claim_type4 claim,
1340 gfp_t gfp_mask)
1341 {
1342 struct dentry *parent = dget_parent(dentry);
1343 struct inode *dir = d_inode(parent);
1344 struct nfs_server *server = NFS_SERVER(dir);
1345 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1346 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1347 struct nfs4_opendata *p;
1348
1349 p = kzalloc(sizeof(*p), gfp_mask);
1350 if (p == NULL)
1351 goto err;
1352
1353 p->f_label = nfs4_label_alloc(server, gfp_mask);
1354 if (IS_ERR(p->f_label))
1355 goto err_free_p;
1356
1357 p->a_label = nfs4_label_alloc(server, gfp_mask);
1358 if (IS_ERR(p->a_label))
1359 goto err_free_f;
1360
1361 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1362 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1363 if (IS_ERR(p->o_arg.seqid))
1364 goto err_free_label;
1365 nfs_sb_active(dentry->d_sb);
1366 p->dentry = dget(dentry);
1367 p->dir = parent;
1368 p->owner = sp;
1369 atomic_inc(&sp->so_count);
1370 p->o_arg.open_flags = flags;
1371 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1372 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1373 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1374 fmode, flags);
1375 if (flags & O_CREAT) {
1376 p->o_arg.umask = current_umask();
1377 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1378 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1379 p->o_arg.u.attrs = &p->attrs;
1380 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1381
1382 memcpy(p->o_arg.u.verifier.data, c->verf,
1383 sizeof(p->o_arg.u.verifier.data));
1384 }
1385 }
1386 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1387 * will return permission denied for all bits until close */
1388 if (!(flags & O_EXCL)) {
1389 /* ask server to check for all possible rights as results
1390 * are cached */
1391 switch (p->o_arg.claim) {
1392 default:
1393 break;
1394 case NFS4_OPEN_CLAIM_NULL:
1395 case NFS4_OPEN_CLAIM_FH:
1396 p->o_arg.access = NFS4_ACCESS_READ |
1397 NFS4_ACCESS_MODIFY |
1398 NFS4_ACCESS_EXTEND |
1399 NFS4_ACCESS_EXECUTE;
1400 #ifdef CONFIG_NFS_V4_2
1401 if (server->caps & NFS_CAP_XATTR)
1402 p->o_arg.access |= NFS4_ACCESS_XAREAD |
1403 NFS4_ACCESS_XAWRITE |
1404 NFS4_ACCESS_XALIST;
1405 #endif
1406 }
1407 }
1408 p->o_arg.clientid = server->nfs_client->cl_clientid;
1409 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1410 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1411 p->o_arg.name = &dentry->d_name;
1412 p->o_arg.server = server;
1413 p->o_arg.bitmask = nfs4_bitmask(server, label);
1414 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1415 switch (p->o_arg.claim) {
1416 case NFS4_OPEN_CLAIM_NULL:
1417 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1418 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1419 p->o_arg.fh = NFS_FH(dir);
1420 break;
1421 case NFS4_OPEN_CLAIM_PREVIOUS:
1422 case NFS4_OPEN_CLAIM_FH:
1423 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1424 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1425 p->o_arg.fh = NFS_FH(d_inode(dentry));
1426 }
1427 p->c_arg.fh = &p->o_res.fh;
1428 p->c_arg.stateid = &p->o_res.stateid;
1429 p->c_arg.seqid = p->o_arg.seqid;
1430 nfs4_init_opendata_res(p);
1431 kref_init(&p->kref);
1432 return p;
1433
1434 err_free_label:
1435 nfs4_label_free(p->a_label);
1436 err_free_f:
1437 nfs4_label_free(p->f_label);
1438 err_free_p:
1439 kfree(p);
1440 err:
1441 dput(parent);
1442 return NULL;
1443 }
1444
nfs4_opendata_free(struct kref * kref)1445 static void nfs4_opendata_free(struct kref *kref)
1446 {
1447 struct nfs4_opendata *p = container_of(kref,
1448 struct nfs4_opendata, kref);
1449 struct super_block *sb = p->dentry->d_sb;
1450
1451 nfs4_lgopen_release(p->lgp);
1452 nfs_free_seqid(p->o_arg.seqid);
1453 nfs4_sequence_free_slot(&p->o_res.seq_res);
1454 if (p->state != NULL)
1455 nfs4_put_open_state(p->state);
1456 nfs4_put_state_owner(p->owner);
1457
1458 nfs4_label_free(p->a_label);
1459 nfs4_label_free(p->f_label);
1460
1461 dput(p->dir);
1462 dput(p->dentry);
1463 nfs_sb_deactive(sb);
1464 nfs_fattr_free_names(&p->f_attr);
1465 kfree(p->f_attr.mdsthreshold);
1466 kfree(p);
1467 }
1468
nfs4_opendata_put(struct nfs4_opendata * p)1469 static void nfs4_opendata_put(struct nfs4_opendata *p)
1470 {
1471 if (p != NULL)
1472 kref_put(&p->kref, nfs4_opendata_free);
1473 }
1474
nfs4_mode_match_open_stateid(struct nfs4_state * state,fmode_t fmode)1475 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1476 fmode_t fmode)
1477 {
1478 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1479 case FMODE_READ|FMODE_WRITE:
1480 return state->n_rdwr != 0;
1481 case FMODE_WRITE:
1482 return state->n_wronly != 0;
1483 case FMODE_READ:
1484 return state->n_rdonly != 0;
1485 }
1486 WARN_ON_ONCE(1);
1487 return false;
1488 }
1489
can_open_cached(struct nfs4_state * state,fmode_t mode,int open_mode,enum open_claim_type4 claim)1490 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1491 int open_mode, enum open_claim_type4 claim)
1492 {
1493 int ret = 0;
1494
1495 if (open_mode & (O_EXCL|O_TRUNC))
1496 goto out;
1497 switch (claim) {
1498 case NFS4_OPEN_CLAIM_NULL:
1499 case NFS4_OPEN_CLAIM_FH:
1500 goto out;
1501 default:
1502 break;
1503 }
1504 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1505 case FMODE_READ:
1506 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1507 && state->n_rdonly != 0;
1508 break;
1509 case FMODE_WRITE:
1510 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1511 && state->n_wronly != 0;
1512 break;
1513 case FMODE_READ|FMODE_WRITE:
1514 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1515 && state->n_rdwr != 0;
1516 }
1517 out:
1518 return ret;
1519 }
1520
can_open_delegated(struct nfs_delegation * delegation,fmode_t fmode,enum open_claim_type4 claim)1521 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1522 enum open_claim_type4 claim)
1523 {
1524 if (delegation == NULL)
1525 return 0;
1526 if ((delegation->type & fmode) != fmode)
1527 return 0;
1528 switch (claim) {
1529 case NFS4_OPEN_CLAIM_NULL:
1530 case NFS4_OPEN_CLAIM_FH:
1531 break;
1532 case NFS4_OPEN_CLAIM_PREVIOUS:
1533 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1534 break;
1535 fallthrough;
1536 default:
1537 return 0;
1538 }
1539 nfs_mark_delegation_referenced(delegation);
1540 return 1;
1541 }
1542
update_open_stateflags(struct nfs4_state * state,fmode_t fmode)1543 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1544 {
1545 switch (fmode) {
1546 case FMODE_WRITE:
1547 state->n_wronly++;
1548 break;
1549 case FMODE_READ:
1550 state->n_rdonly++;
1551 break;
1552 case FMODE_READ|FMODE_WRITE:
1553 state->n_rdwr++;
1554 }
1555 nfs4_state_set_mode_locked(state, state->state | fmode);
1556 }
1557
1558 #ifdef CONFIG_NFS_V4_1
nfs_open_stateid_recover_openmode(struct nfs4_state * state)1559 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1560 {
1561 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1562 return true;
1563 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1564 return true;
1565 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1566 return true;
1567 return false;
1568 }
1569 #endif /* CONFIG_NFS_V4_1 */
1570
nfs_state_log_update_open_stateid(struct nfs4_state * state)1571 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1572 {
1573 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1574 wake_up_all(&state->waitq);
1575 }
1576
nfs_test_and_clear_all_open_stateid(struct nfs4_state * state)1577 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1578 {
1579 struct nfs_client *clp = state->owner->so_server->nfs_client;
1580 bool need_recover = false;
1581
1582 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1583 need_recover = true;
1584 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1585 need_recover = true;
1586 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1587 need_recover = true;
1588 if (need_recover)
1589 nfs4_state_mark_reclaim_nograce(clp, state);
1590 }
1591
1592 /*
1593 * Check for whether or not the caller may update the open stateid
1594 * to the value passed in by stateid.
1595 *
1596 * Note: This function relies heavily on the server implementing
1597 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1598 * correctly.
1599 * i.e. The stateid seqids have to be initialised to 1, and
1600 * are then incremented on every state transition.
1601 */
nfs_stateid_is_sequential(struct nfs4_state * state,const nfs4_stateid * stateid)1602 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1603 const nfs4_stateid *stateid)
1604 {
1605 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1606 /* The common case - we're updating to a new sequence number */
1607 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1608 nfs4_stateid_is_next(&state->open_stateid, stateid)) {
1609 return true;
1610 }
1611 } else {
1612 /* This is the first OPEN in this generation */
1613 if (stateid->seqid == cpu_to_be32(1))
1614 return true;
1615 }
1616 return false;
1617 }
1618
nfs_resync_open_stateid_locked(struct nfs4_state * state)1619 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1620 {
1621 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1622 return;
1623 if (state->n_wronly)
1624 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1625 if (state->n_rdonly)
1626 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1627 if (state->n_rdwr)
1628 set_bit(NFS_O_RDWR_STATE, &state->flags);
1629 set_bit(NFS_OPEN_STATE, &state->flags);
1630 }
1631
nfs_clear_open_stateid_locked(struct nfs4_state * state,nfs4_stateid * stateid,fmode_t fmode)1632 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1633 nfs4_stateid *stateid, fmode_t fmode)
1634 {
1635 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1636 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1637 case FMODE_WRITE:
1638 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1639 break;
1640 case FMODE_READ:
1641 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1642 break;
1643 case 0:
1644 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1645 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1646 clear_bit(NFS_OPEN_STATE, &state->flags);
1647 }
1648 if (stateid == NULL)
1649 return;
1650 /* Handle OPEN+OPEN_DOWNGRADE races */
1651 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1652 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1653 nfs_resync_open_stateid_locked(state);
1654 goto out;
1655 }
1656 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1657 nfs4_stateid_copy(&state->stateid, stateid);
1658 nfs4_stateid_copy(&state->open_stateid, stateid);
1659 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1660 out:
1661 nfs_state_log_update_open_stateid(state);
1662 }
1663
nfs_clear_open_stateid(struct nfs4_state * state,nfs4_stateid * arg_stateid,nfs4_stateid * stateid,fmode_t fmode)1664 static void nfs_clear_open_stateid(struct nfs4_state *state,
1665 nfs4_stateid *arg_stateid,
1666 nfs4_stateid *stateid, fmode_t fmode)
1667 {
1668 write_seqlock(&state->seqlock);
1669 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1670 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1671 nfs_clear_open_stateid_locked(state, stateid, fmode);
1672 write_sequnlock(&state->seqlock);
1673 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1674 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1675 }
1676
nfs_set_open_stateid_locked(struct nfs4_state * state,const nfs4_stateid * stateid,nfs4_stateid * freeme)1677 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1678 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1679 __must_hold(&state->owner->so_lock)
1680 __must_hold(&state->seqlock)
1681 __must_hold(RCU)
1682
1683 {
1684 DEFINE_WAIT(wait);
1685 int status = 0;
1686 for (;;) {
1687
1688 if (nfs_stateid_is_sequential(state, stateid))
1689 break;
1690
1691 if (status)
1692 break;
1693 /* Rely on seqids for serialisation with NFSv4.0 */
1694 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1695 break;
1696
1697 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1698 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1699 /*
1700 * Ensure we process the state changes in the same order
1701 * in which the server processed them by delaying the
1702 * update of the stateid until we are in sequence.
1703 */
1704 write_sequnlock(&state->seqlock);
1705 spin_unlock(&state->owner->so_lock);
1706 rcu_read_unlock();
1707 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1708
1709 if (!signal_pending(current)) {
1710 if (schedule_timeout(5*HZ) == 0)
1711 status = -EAGAIN;
1712 else
1713 status = 0;
1714 } else
1715 status = -EINTR;
1716 finish_wait(&state->waitq, &wait);
1717 rcu_read_lock();
1718 spin_lock(&state->owner->so_lock);
1719 write_seqlock(&state->seqlock);
1720 }
1721
1722 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1723 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1724 nfs4_stateid_copy(freeme, &state->open_stateid);
1725 nfs_test_and_clear_all_open_stateid(state);
1726 }
1727
1728 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1729 nfs4_stateid_copy(&state->stateid, stateid);
1730 nfs4_stateid_copy(&state->open_stateid, stateid);
1731 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1732 nfs_state_log_update_open_stateid(state);
1733 }
1734
nfs_state_set_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,fmode_t fmode,nfs4_stateid * freeme)1735 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1736 const nfs4_stateid *open_stateid,
1737 fmode_t fmode,
1738 nfs4_stateid *freeme)
1739 {
1740 /*
1741 * Protect the call to nfs4_state_set_mode_locked and
1742 * serialise the stateid update
1743 */
1744 write_seqlock(&state->seqlock);
1745 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1746 switch (fmode) {
1747 case FMODE_READ:
1748 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1749 break;
1750 case FMODE_WRITE:
1751 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1752 break;
1753 case FMODE_READ|FMODE_WRITE:
1754 set_bit(NFS_O_RDWR_STATE, &state->flags);
1755 }
1756 set_bit(NFS_OPEN_STATE, &state->flags);
1757 write_sequnlock(&state->seqlock);
1758 }
1759
nfs_state_clear_open_state_flags(struct nfs4_state * state)1760 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1761 {
1762 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1763 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1764 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1765 clear_bit(NFS_OPEN_STATE, &state->flags);
1766 }
1767
nfs_state_set_delegation(struct nfs4_state * state,const nfs4_stateid * deleg_stateid,fmode_t fmode)1768 static void nfs_state_set_delegation(struct nfs4_state *state,
1769 const nfs4_stateid *deleg_stateid,
1770 fmode_t fmode)
1771 {
1772 /*
1773 * Protect the call to nfs4_state_set_mode_locked and
1774 * serialise the stateid update
1775 */
1776 write_seqlock(&state->seqlock);
1777 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1778 set_bit(NFS_DELEGATED_STATE, &state->flags);
1779 write_sequnlock(&state->seqlock);
1780 }
1781
nfs_state_clear_delegation(struct nfs4_state * state)1782 static void nfs_state_clear_delegation(struct nfs4_state *state)
1783 {
1784 write_seqlock(&state->seqlock);
1785 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1786 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1787 write_sequnlock(&state->seqlock);
1788 }
1789
update_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,const nfs4_stateid * delegation,fmode_t fmode)1790 int update_open_stateid(struct nfs4_state *state,
1791 const nfs4_stateid *open_stateid,
1792 const nfs4_stateid *delegation,
1793 fmode_t fmode)
1794 {
1795 struct nfs_server *server = NFS_SERVER(state->inode);
1796 struct nfs_client *clp = server->nfs_client;
1797 struct nfs_inode *nfsi = NFS_I(state->inode);
1798 struct nfs_delegation *deleg_cur;
1799 nfs4_stateid freeme = { };
1800 int ret = 0;
1801
1802 fmode &= (FMODE_READ|FMODE_WRITE);
1803
1804 rcu_read_lock();
1805 spin_lock(&state->owner->so_lock);
1806 if (open_stateid != NULL) {
1807 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1808 ret = 1;
1809 }
1810
1811 deleg_cur = nfs4_get_valid_delegation(state->inode);
1812 if (deleg_cur == NULL)
1813 goto no_delegation;
1814
1815 spin_lock(&deleg_cur->lock);
1816 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1817 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1818 (deleg_cur->type & fmode) != fmode)
1819 goto no_delegation_unlock;
1820
1821 if (delegation == NULL)
1822 delegation = &deleg_cur->stateid;
1823 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1824 goto no_delegation_unlock;
1825
1826 nfs_mark_delegation_referenced(deleg_cur);
1827 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1828 ret = 1;
1829 no_delegation_unlock:
1830 spin_unlock(&deleg_cur->lock);
1831 no_delegation:
1832 if (ret)
1833 update_open_stateflags(state, fmode);
1834 spin_unlock(&state->owner->so_lock);
1835 rcu_read_unlock();
1836
1837 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1838 nfs4_schedule_state_manager(clp);
1839 if (freeme.type != 0)
1840 nfs4_test_and_free_stateid(server, &freeme,
1841 state->owner->so_cred);
1842
1843 return ret;
1844 }
1845
nfs4_update_lock_stateid(struct nfs4_lock_state * lsp,const nfs4_stateid * stateid)1846 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1847 const nfs4_stateid *stateid)
1848 {
1849 struct nfs4_state *state = lsp->ls_state;
1850 bool ret = false;
1851
1852 spin_lock(&state->state_lock);
1853 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1854 goto out_noupdate;
1855 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1856 goto out_noupdate;
1857 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1858 ret = true;
1859 out_noupdate:
1860 spin_unlock(&state->state_lock);
1861 return ret;
1862 }
1863
nfs4_return_incompatible_delegation(struct inode * inode,fmode_t fmode)1864 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1865 {
1866 struct nfs_delegation *delegation;
1867
1868 fmode &= FMODE_READ|FMODE_WRITE;
1869 rcu_read_lock();
1870 delegation = nfs4_get_valid_delegation(inode);
1871 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1872 rcu_read_unlock();
1873 return;
1874 }
1875 rcu_read_unlock();
1876 nfs4_inode_return_delegation(inode);
1877 }
1878
nfs4_try_open_cached(struct nfs4_opendata * opendata)1879 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1880 {
1881 struct nfs4_state *state = opendata->state;
1882 struct nfs_delegation *delegation;
1883 int open_mode = opendata->o_arg.open_flags;
1884 fmode_t fmode = opendata->o_arg.fmode;
1885 enum open_claim_type4 claim = opendata->o_arg.claim;
1886 nfs4_stateid stateid;
1887 int ret = -EAGAIN;
1888
1889 for (;;) {
1890 spin_lock(&state->owner->so_lock);
1891 if (can_open_cached(state, fmode, open_mode, claim)) {
1892 update_open_stateflags(state, fmode);
1893 spin_unlock(&state->owner->so_lock);
1894 goto out_return_state;
1895 }
1896 spin_unlock(&state->owner->so_lock);
1897 rcu_read_lock();
1898 delegation = nfs4_get_valid_delegation(state->inode);
1899 if (!can_open_delegated(delegation, fmode, claim)) {
1900 rcu_read_unlock();
1901 break;
1902 }
1903 /* Save the delegation */
1904 nfs4_stateid_copy(&stateid, &delegation->stateid);
1905 rcu_read_unlock();
1906 nfs_release_seqid(opendata->o_arg.seqid);
1907 if (!opendata->is_recover) {
1908 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1909 if (ret != 0)
1910 goto out;
1911 }
1912 ret = -EAGAIN;
1913
1914 /* Try to update the stateid using the delegation */
1915 if (update_open_stateid(state, NULL, &stateid, fmode))
1916 goto out_return_state;
1917 }
1918 out:
1919 return ERR_PTR(ret);
1920 out_return_state:
1921 refcount_inc(&state->count);
1922 return state;
1923 }
1924
1925 static void
nfs4_opendata_check_deleg(struct nfs4_opendata * data,struct nfs4_state * state)1926 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1927 {
1928 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1929 struct nfs_delegation *delegation;
1930 int delegation_flags = 0;
1931
1932 rcu_read_lock();
1933 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1934 if (delegation)
1935 delegation_flags = delegation->flags;
1936 rcu_read_unlock();
1937 switch (data->o_arg.claim) {
1938 default:
1939 break;
1940 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1941 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1942 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1943 "returning a delegation for "
1944 "OPEN(CLAIM_DELEGATE_CUR)\n",
1945 clp->cl_hostname);
1946 return;
1947 }
1948 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1949 nfs_inode_set_delegation(state->inode,
1950 data->owner->so_cred,
1951 data->o_res.delegation_type,
1952 &data->o_res.delegation,
1953 data->o_res.pagemod_limit);
1954 else
1955 nfs_inode_reclaim_delegation(state->inode,
1956 data->owner->so_cred,
1957 data->o_res.delegation_type,
1958 &data->o_res.delegation,
1959 data->o_res.pagemod_limit);
1960
1961 if (data->o_res.do_recall)
1962 nfs_async_inode_return_delegation(state->inode,
1963 &data->o_res.delegation);
1964 }
1965
1966 /*
1967 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1968 * and update the nfs4_state.
1969 */
1970 static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata * data)1971 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1972 {
1973 struct inode *inode = data->state->inode;
1974 struct nfs4_state *state = data->state;
1975 int ret;
1976
1977 if (!data->rpc_done) {
1978 if (data->rpc_status)
1979 return ERR_PTR(data->rpc_status);
1980 /* cached opens have already been processed */
1981 goto update;
1982 }
1983
1984 ret = nfs_refresh_inode(inode, &data->f_attr);
1985 if (ret)
1986 return ERR_PTR(ret);
1987
1988 if (data->o_res.delegation_type != 0)
1989 nfs4_opendata_check_deleg(data, state);
1990 update:
1991 if (!update_open_stateid(state, &data->o_res.stateid,
1992 NULL, data->o_arg.fmode))
1993 return ERR_PTR(-EAGAIN);
1994 refcount_inc(&state->count);
1995
1996 return state;
1997 }
1998
1999 static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata * data)2000 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2001 {
2002 struct inode *inode;
2003
2004 switch (data->o_arg.claim) {
2005 case NFS4_OPEN_CLAIM_NULL:
2006 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2007 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2008 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2009 return ERR_PTR(-EAGAIN);
2010 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2011 &data->f_attr, data->f_label);
2012 break;
2013 default:
2014 inode = d_inode(data->dentry);
2015 ihold(inode);
2016 nfs_refresh_inode(inode, &data->f_attr);
2017 }
2018 return inode;
2019 }
2020
2021 static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata * data)2022 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2023 {
2024 struct nfs4_state *state;
2025 struct inode *inode;
2026
2027 inode = nfs4_opendata_get_inode(data);
2028 if (IS_ERR(inode))
2029 return ERR_CAST(inode);
2030 if (data->state != NULL && data->state->inode == inode) {
2031 state = data->state;
2032 refcount_inc(&state->count);
2033 } else
2034 state = nfs4_get_open_state(inode, data->owner);
2035 iput(inode);
2036 if (state == NULL)
2037 state = ERR_PTR(-ENOMEM);
2038 return state;
2039 }
2040
2041 static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2042 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2043 {
2044 struct nfs4_state *state;
2045
2046 if (!data->rpc_done) {
2047 state = nfs4_try_open_cached(data);
2048 trace_nfs4_cached_open(data->state);
2049 goto out;
2050 }
2051
2052 state = nfs4_opendata_find_nfs4_state(data);
2053 if (IS_ERR(state))
2054 goto out;
2055
2056 if (data->o_res.delegation_type != 0)
2057 nfs4_opendata_check_deleg(data, state);
2058 if (!update_open_stateid(state, &data->o_res.stateid,
2059 NULL, data->o_arg.fmode)) {
2060 nfs4_put_open_state(state);
2061 state = ERR_PTR(-EAGAIN);
2062 }
2063 out:
2064 nfs_release_seqid(data->o_arg.seqid);
2065 return state;
2066 }
2067
2068 static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2069 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2070 {
2071 struct nfs4_state *ret;
2072
2073 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2074 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2075 else
2076 ret = _nfs4_opendata_to_nfs4_state(data);
2077 nfs4_sequence_free_slot(&data->o_res.seq_res);
2078 return ret;
2079 }
2080
2081 static struct nfs_open_context *
nfs4_state_find_open_context_mode(struct nfs4_state * state,fmode_t mode)2082 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2083 {
2084 struct nfs_inode *nfsi = NFS_I(state->inode);
2085 struct nfs_open_context *ctx;
2086
2087 rcu_read_lock();
2088 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2089 if (ctx->state != state)
2090 continue;
2091 if ((ctx->mode & mode) != mode)
2092 continue;
2093 if (!get_nfs_open_context(ctx))
2094 continue;
2095 rcu_read_unlock();
2096 return ctx;
2097 }
2098 rcu_read_unlock();
2099 return ERR_PTR(-ENOENT);
2100 }
2101
2102 static struct nfs_open_context *
nfs4_state_find_open_context(struct nfs4_state * state)2103 nfs4_state_find_open_context(struct nfs4_state *state)
2104 {
2105 struct nfs_open_context *ctx;
2106
2107 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2108 if (!IS_ERR(ctx))
2109 return ctx;
2110 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2111 if (!IS_ERR(ctx))
2112 return ctx;
2113 return nfs4_state_find_open_context_mode(state, FMODE_READ);
2114 }
2115
nfs4_open_recoverdata_alloc(struct nfs_open_context * ctx,struct nfs4_state * state,enum open_claim_type4 claim)2116 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2117 struct nfs4_state *state, enum open_claim_type4 claim)
2118 {
2119 struct nfs4_opendata *opendata;
2120
2121 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2122 NULL, claim, GFP_NOFS);
2123 if (opendata == NULL)
2124 return ERR_PTR(-ENOMEM);
2125 opendata->state = state;
2126 refcount_inc(&state->count);
2127 return opendata;
2128 }
2129
nfs4_open_recover_helper(struct nfs4_opendata * opendata,fmode_t fmode)2130 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2131 fmode_t fmode)
2132 {
2133 struct nfs4_state *newstate;
2134 int ret;
2135
2136 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2137 return 0;
2138 opendata->o_arg.open_flags = 0;
2139 opendata->o_arg.fmode = fmode;
2140 opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2141 NFS_SB(opendata->dentry->d_sb),
2142 fmode, 0);
2143 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2144 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2145 nfs4_init_opendata_res(opendata);
2146 ret = _nfs4_recover_proc_open(opendata);
2147 if (ret != 0)
2148 return ret;
2149 newstate = nfs4_opendata_to_nfs4_state(opendata);
2150 if (IS_ERR(newstate))
2151 return PTR_ERR(newstate);
2152 if (newstate != opendata->state)
2153 ret = -ESTALE;
2154 nfs4_close_state(newstate, fmode);
2155 return ret;
2156 }
2157
nfs4_open_recover(struct nfs4_opendata * opendata,struct nfs4_state * state)2158 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2159 {
2160 int ret;
2161
2162 /* memory barrier prior to reading state->n_* */
2163 smp_rmb();
2164 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2165 if (ret != 0)
2166 return ret;
2167 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2168 if (ret != 0)
2169 return ret;
2170 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2171 if (ret != 0)
2172 return ret;
2173 /*
2174 * We may have performed cached opens for all three recoveries.
2175 * Check if we need to update the current stateid.
2176 */
2177 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2178 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2179 write_seqlock(&state->seqlock);
2180 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2181 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2182 write_sequnlock(&state->seqlock);
2183 }
2184 return 0;
2185 }
2186
2187 /*
2188 * OPEN_RECLAIM:
2189 * reclaim state on the server after a reboot.
2190 */
_nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2191 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2192 {
2193 struct nfs_delegation *delegation;
2194 struct nfs4_opendata *opendata;
2195 fmode_t delegation_type = 0;
2196 int status;
2197
2198 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2199 NFS4_OPEN_CLAIM_PREVIOUS);
2200 if (IS_ERR(opendata))
2201 return PTR_ERR(opendata);
2202 rcu_read_lock();
2203 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2204 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2205 delegation_type = delegation->type;
2206 rcu_read_unlock();
2207 opendata->o_arg.u.delegation_type = delegation_type;
2208 status = nfs4_open_recover(opendata, state);
2209 nfs4_opendata_put(opendata);
2210 return status;
2211 }
2212
nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2213 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2214 {
2215 struct nfs_server *server = NFS_SERVER(state->inode);
2216 struct nfs4_exception exception = { };
2217 int err;
2218 do {
2219 err = _nfs4_do_open_reclaim(ctx, state);
2220 trace_nfs4_open_reclaim(ctx, 0, err);
2221 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2222 continue;
2223 if (err != -NFS4ERR_DELAY)
2224 break;
2225 nfs4_handle_exception(server, err, &exception);
2226 } while (exception.retry);
2227 return err;
2228 }
2229
nfs4_open_reclaim(struct nfs4_state_owner * sp,struct nfs4_state * state)2230 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2231 {
2232 struct nfs_open_context *ctx;
2233 int ret;
2234
2235 ctx = nfs4_state_find_open_context(state);
2236 if (IS_ERR(ctx))
2237 return -EAGAIN;
2238 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2239 nfs_state_clear_open_state_flags(state);
2240 ret = nfs4_do_open_reclaim(ctx, state);
2241 put_nfs_open_context(ctx);
2242 return ret;
2243 }
2244
nfs4_handle_delegation_recall_error(struct nfs_server * server,struct nfs4_state * state,const nfs4_stateid * stateid,struct file_lock * fl,int err)2245 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)
2246 {
2247 switch (err) {
2248 default:
2249 printk(KERN_ERR "NFS: %s: unhandled error "
2250 "%d.\n", __func__, err);
2251 fallthrough;
2252 case 0:
2253 case -ENOENT:
2254 case -EAGAIN:
2255 case -ESTALE:
2256 case -ETIMEDOUT:
2257 break;
2258 case -NFS4ERR_BADSESSION:
2259 case -NFS4ERR_BADSLOT:
2260 case -NFS4ERR_BAD_HIGH_SLOT:
2261 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2262 case -NFS4ERR_DEADSESSION:
2263 return -EAGAIN;
2264 case -NFS4ERR_STALE_CLIENTID:
2265 case -NFS4ERR_STALE_STATEID:
2266 /* Don't recall a delegation if it was lost */
2267 nfs4_schedule_lease_recovery(server->nfs_client);
2268 return -EAGAIN;
2269 case -NFS4ERR_MOVED:
2270 nfs4_schedule_migration_recovery(server);
2271 return -EAGAIN;
2272 case -NFS4ERR_LEASE_MOVED:
2273 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2274 return -EAGAIN;
2275 case -NFS4ERR_DELEG_REVOKED:
2276 case -NFS4ERR_ADMIN_REVOKED:
2277 case -NFS4ERR_EXPIRED:
2278 case -NFS4ERR_BAD_STATEID:
2279 case -NFS4ERR_OPENMODE:
2280 nfs_inode_find_state_and_recover(state->inode,
2281 stateid);
2282 nfs4_schedule_stateid_recovery(server, state);
2283 return -EAGAIN;
2284 case -NFS4ERR_DELAY:
2285 case -NFS4ERR_GRACE:
2286 ssleep(1);
2287 return -EAGAIN;
2288 case -ENOMEM:
2289 case -NFS4ERR_DENIED:
2290 if (fl) {
2291 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2292 if (lsp)
2293 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2294 }
2295 return 0;
2296 }
2297 return err;
2298 }
2299
nfs4_open_delegation_recall(struct nfs_open_context * ctx,struct nfs4_state * state,const nfs4_stateid * stateid)2300 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2301 struct nfs4_state *state, const nfs4_stateid *stateid)
2302 {
2303 struct nfs_server *server = NFS_SERVER(state->inode);
2304 struct nfs4_opendata *opendata;
2305 int err = 0;
2306
2307 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2308 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2309 if (IS_ERR(opendata))
2310 return PTR_ERR(opendata);
2311 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2312 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2313 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2314 if (err)
2315 goto out;
2316 }
2317 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2318 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2319 if (err)
2320 goto out;
2321 }
2322 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2323 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2324 if (err)
2325 goto out;
2326 }
2327 nfs_state_clear_delegation(state);
2328 out:
2329 nfs4_opendata_put(opendata);
2330 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2331 }
2332
nfs4_open_confirm_prepare(struct rpc_task * task,void * calldata)2333 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2334 {
2335 struct nfs4_opendata *data = calldata;
2336
2337 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2338 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2339 }
2340
nfs4_open_confirm_done(struct rpc_task * task,void * calldata)2341 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2342 {
2343 struct nfs4_opendata *data = calldata;
2344
2345 nfs40_sequence_done(task, &data->c_res.seq_res);
2346
2347 data->rpc_status = task->tk_status;
2348 if (data->rpc_status == 0) {
2349 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2350 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2351 renew_lease(data->o_res.server, data->timestamp);
2352 data->rpc_done = true;
2353 }
2354 }
2355
nfs4_open_confirm_release(void * calldata)2356 static void nfs4_open_confirm_release(void *calldata)
2357 {
2358 struct nfs4_opendata *data = calldata;
2359 struct nfs4_state *state = NULL;
2360
2361 /* If this request hasn't been cancelled, do nothing */
2362 if (!data->cancelled)
2363 goto out_free;
2364 /* In case of error, no cleanup! */
2365 if (!data->rpc_done)
2366 goto out_free;
2367 state = nfs4_opendata_to_nfs4_state(data);
2368 if (!IS_ERR(state))
2369 nfs4_close_state(state, data->o_arg.fmode);
2370 out_free:
2371 nfs4_opendata_put(data);
2372 }
2373
2374 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2375 .rpc_call_prepare = nfs4_open_confirm_prepare,
2376 .rpc_call_done = nfs4_open_confirm_done,
2377 .rpc_release = nfs4_open_confirm_release,
2378 };
2379
2380 /*
2381 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2382 */
_nfs4_proc_open_confirm(struct nfs4_opendata * data)2383 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2384 {
2385 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2386 struct rpc_task *task;
2387 struct rpc_message msg = {
2388 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2389 .rpc_argp = &data->c_arg,
2390 .rpc_resp = &data->c_res,
2391 .rpc_cred = data->owner->so_cred,
2392 };
2393 struct rpc_task_setup task_setup_data = {
2394 .rpc_client = server->client,
2395 .rpc_message = &msg,
2396 .callback_ops = &nfs4_open_confirm_ops,
2397 .callback_data = data,
2398 .workqueue = nfsiod_workqueue,
2399 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2400 };
2401 int status;
2402
2403 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2404 data->is_recover);
2405 kref_get(&data->kref);
2406 data->rpc_done = false;
2407 data->rpc_status = 0;
2408 data->timestamp = jiffies;
2409 task = rpc_run_task(&task_setup_data);
2410 if (IS_ERR(task))
2411 return PTR_ERR(task);
2412 status = rpc_wait_for_completion_task(task);
2413 if (status != 0) {
2414 data->cancelled = true;
2415 smp_wmb();
2416 } else
2417 status = data->rpc_status;
2418 rpc_put_task(task);
2419 return status;
2420 }
2421
nfs4_open_prepare(struct rpc_task * task,void * calldata)2422 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2423 {
2424 struct nfs4_opendata *data = calldata;
2425 struct nfs4_state_owner *sp = data->owner;
2426 struct nfs_client *clp = sp->so_server->nfs_client;
2427 enum open_claim_type4 claim = data->o_arg.claim;
2428
2429 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2430 goto out_wait;
2431 /*
2432 * Check if we still need to send an OPEN call, or if we can use
2433 * a delegation instead.
2434 */
2435 if (data->state != NULL) {
2436 struct nfs_delegation *delegation;
2437
2438 if (can_open_cached(data->state, data->o_arg.fmode,
2439 data->o_arg.open_flags, claim))
2440 goto out_no_action;
2441 rcu_read_lock();
2442 delegation = nfs4_get_valid_delegation(data->state->inode);
2443 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2444 goto unlock_no_action;
2445 rcu_read_unlock();
2446 }
2447 /* Update client id. */
2448 data->o_arg.clientid = clp->cl_clientid;
2449 switch (claim) {
2450 default:
2451 break;
2452 case NFS4_OPEN_CLAIM_PREVIOUS:
2453 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2454 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2455 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2456 fallthrough;
2457 case NFS4_OPEN_CLAIM_FH:
2458 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2459 }
2460 data->timestamp = jiffies;
2461 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2462 &data->o_arg.seq_args,
2463 &data->o_res.seq_res,
2464 task) != 0)
2465 nfs_release_seqid(data->o_arg.seqid);
2466
2467 /* Set the create mode (note dependency on the session type) */
2468 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2469 if (data->o_arg.open_flags & O_EXCL) {
2470 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2471 if (nfs4_has_persistent_session(clp))
2472 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2473 else if (clp->cl_mvops->minor_version > 0)
2474 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2475 }
2476 return;
2477 unlock_no_action:
2478 trace_nfs4_cached_open(data->state);
2479 rcu_read_unlock();
2480 out_no_action:
2481 task->tk_action = NULL;
2482 out_wait:
2483 nfs4_sequence_done(task, &data->o_res.seq_res);
2484 }
2485
nfs4_open_done(struct rpc_task * task,void * calldata)2486 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2487 {
2488 struct nfs4_opendata *data = calldata;
2489
2490 data->rpc_status = task->tk_status;
2491
2492 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2493 return;
2494
2495 if (task->tk_status == 0) {
2496 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2497 switch (data->o_res.f_attr->mode & S_IFMT) {
2498 case S_IFREG:
2499 break;
2500 case S_IFLNK:
2501 data->rpc_status = -ELOOP;
2502 break;
2503 case S_IFDIR:
2504 data->rpc_status = -EISDIR;
2505 break;
2506 default:
2507 data->rpc_status = -ENOTDIR;
2508 }
2509 }
2510 renew_lease(data->o_res.server, data->timestamp);
2511 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2512 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2513 }
2514 data->rpc_done = true;
2515 }
2516
nfs4_open_release(void * calldata)2517 static void nfs4_open_release(void *calldata)
2518 {
2519 struct nfs4_opendata *data = calldata;
2520 struct nfs4_state *state = NULL;
2521
2522 /* If this request hasn't been cancelled, do nothing */
2523 if (!data->cancelled)
2524 goto out_free;
2525 /* In case of error, no cleanup! */
2526 if (data->rpc_status != 0 || !data->rpc_done)
2527 goto out_free;
2528 /* In case we need an open_confirm, no cleanup! */
2529 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2530 goto out_free;
2531 state = nfs4_opendata_to_nfs4_state(data);
2532 if (!IS_ERR(state))
2533 nfs4_close_state(state, data->o_arg.fmode);
2534 out_free:
2535 nfs4_opendata_put(data);
2536 }
2537
2538 static const struct rpc_call_ops nfs4_open_ops = {
2539 .rpc_call_prepare = nfs4_open_prepare,
2540 .rpc_call_done = nfs4_open_done,
2541 .rpc_release = nfs4_open_release,
2542 };
2543
nfs4_run_open_task(struct nfs4_opendata * data,struct nfs_open_context * ctx)2544 static int nfs4_run_open_task(struct nfs4_opendata *data,
2545 struct nfs_open_context *ctx)
2546 {
2547 struct inode *dir = d_inode(data->dir);
2548 struct nfs_server *server = NFS_SERVER(dir);
2549 struct nfs_openargs *o_arg = &data->o_arg;
2550 struct nfs_openres *o_res = &data->o_res;
2551 struct rpc_task *task;
2552 struct rpc_message msg = {
2553 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2554 .rpc_argp = o_arg,
2555 .rpc_resp = o_res,
2556 .rpc_cred = data->owner->so_cred,
2557 };
2558 struct rpc_task_setup task_setup_data = {
2559 .rpc_client = server->client,
2560 .rpc_message = &msg,
2561 .callback_ops = &nfs4_open_ops,
2562 .callback_data = data,
2563 .workqueue = nfsiod_workqueue,
2564 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2565 };
2566 int status;
2567
2568 kref_get(&data->kref);
2569 data->rpc_done = false;
2570 data->rpc_status = 0;
2571 data->cancelled = false;
2572 data->is_recover = false;
2573 if (!ctx) {
2574 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2575 data->is_recover = true;
2576 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2577 } else {
2578 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2579 pnfs_lgopen_prepare(data, ctx);
2580 }
2581 task = rpc_run_task(&task_setup_data);
2582 if (IS_ERR(task))
2583 return PTR_ERR(task);
2584 status = rpc_wait_for_completion_task(task);
2585 if (status != 0) {
2586 data->cancelled = true;
2587 smp_wmb();
2588 } else
2589 status = data->rpc_status;
2590 rpc_put_task(task);
2591
2592 return status;
2593 }
2594
_nfs4_recover_proc_open(struct nfs4_opendata * data)2595 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2596 {
2597 struct inode *dir = d_inode(data->dir);
2598 struct nfs_openres *o_res = &data->o_res;
2599 int status;
2600
2601 status = nfs4_run_open_task(data, NULL);
2602 if (status != 0 || !data->rpc_done)
2603 return status;
2604
2605 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2606
2607 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2608 status = _nfs4_proc_open_confirm(data);
2609
2610 return status;
2611 }
2612
2613 /*
2614 * Additional permission checks in order to distinguish between an
2615 * open for read, and an open for execute. This works around the
2616 * fact that NFSv4 OPEN treats read and execute permissions as being
2617 * the same.
2618 * Note that in the non-execute case, we want to turn off permission
2619 * checking if we just created a new file (POSIX open() semantics).
2620 */
nfs4_opendata_access(const struct cred * cred,struct nfs4_opendata * opendata,struct nfs4_state * state,fmode_t fmode,int openflags)2621 static int nfs4_opendata_access(const struct cred *cred,
2622 struct nfs4_opendata *opendata,
2623 struct nfs4_state *state, fmode_t fmode,
2624 int openflags)
2625 {
2626 struct nfs_access_entry cache;
2627 u32 mask, flags;
2628
2629 /* access call failed or for some reason the server doesn't
2630 * support any access modes -- defer access call until later */
2631 if (opendata->o_res.access_supported == 0)
2632 return 0;
2633
2634 mask = 0;
2635 /*
2636 * Use openflags to check for exec, because fmode won't
2637 * always have FMODE_EXEC set when file open for exec.
2638 */
2639 if (openflags & __FMODE_EXEC) {
2640 /* ONLY check for exec rights */
2641 if (S_ISDIR(state->inode->i_mode))
2642 mask = NFS4_ACCESS_LOOKUP;
2643 else
2644 mask = NFS4_ACCESS_EXECUTE;
2645 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2646 mask = NFS4_ACCESS_READ;
2647
2648 cache.cred = cred;
2649 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2650 nfs_access_add_cache(state->inode, &cache);
2651
2652 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2653 if ((mask & ~cache.mask & flags) == 0)
2654 return 0;
2655
2656 return -EACCES;
2657 }
2658
2659 /*
2660 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2661 */
_nfs4_proc_open(struct nfs4_opendata * data,struct nfs_open_context * ctx)2662 static int _nfs4_proc_open(struct nfs4_opendata *data,
2663 struct nfs_open_context *ctx)
2664 {
2665 struct inode *dir = d_inode(data->dir);
2666 struct nfs_server *server = NFS_SERVER(dir);
2667 struct nfs_openargs *o_arg = &data->o_arg;
2668 struct nfs_openres *o_res = &data->o_res;
2669 int status;
2670
2671 status = nfs4_run_open_task(data, ctx);
2672 if (!data->rpc_done)
2673 return status;
2674 if (status != 0) {
2675 if (status == -NFS4ERR_BADNAME &&
2676 !(o_arg->open_flags & O_CREAT))
2677 return -ENOENT;
2678 return status;
2679 }
2680
2681 nfs_fattr_map_and_free_names(server, &data->f_attr);
2682
2683 if (o_arg->open_flags & O_CREAT) {
2684 if (o_arg->open_flags & O_EXCL)
2685 data->file_created = true;
2686 else if (o_res->cinfo.before != o_res->cinfo.after)
2687 data->file_created = true;
2688 if (data->file_created ||
2689 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2690 nfs4_update_changeattr(dir, &o_res->cinfo,
2691 o_res->f_attr->time_start,
2692 NFS_INO_INVALID_DATA);
2693 }
2694 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2695 server->caps &= ~NFS_CAP_POSIX_LOCK;
2696 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2697 status = _nfs4_proc_open_confirm(data);
2698 if (status != 0)
2699 return status;
2700 }
2701 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2702 nfs4_sequence_free_slot(&o_res->seq_res);
2703 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr,
2704 o_res->f_label, NULL);
2705 }
2706 return 0;
2707 }
2708
2709 /*
2710 * OPEN_EXPIRED:
2711 * reclaim state on the server after a network partition.
2712 * Assumes caller holds the appropriate lock
2713 */
_nfs4_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2714 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2715 {
2716 struct nfs4_opendata *opendata;
2717 int ret;
2718
2719 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2720 NFS4_OPEN_CLAIM_FH);
2721 if (IS_ERR(opendata))
2722 return PTR_ERR(opendata);
2723 ret = nfs4_open_recover(opendata, state);
2724 if (ret == -ESTALE)
2725 d_drop(ctx->dentry);
2726 nfs4_opendata_put(opendata);
2727 return ret;
2728 }
2729
nfs4_do_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2730 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2731 {
2732 struct nfs_server *server = NFS_SERVER(state->inode);
2733 struct nfs4_exception exception = { };
2734 int err;
2735
2736 do {
2737 err = _nfs4_open_expired(ctx, state);
2738 trace_nfs4_open_expired(ctx, 0, err);
2739 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2740 continue;
2741 switch (err) {
2742 default:
2743 goto out;
2744 case -NFS4ERR_GRACE:
2745 case -NFS4ERR_DELAY:
2746 nfs4_handle_exception(server, err, &exception);
2747 err = 0;
2748 }
2749 } while (exception.retry);
2750 out:
2751 return err;
2752 }
2753
nfs4_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2754 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2755 {
2756 struct nfs_open_context *ctx;
2757 int ret;
2758
2759 ctx = nfs4_state_find_open_context(state);
2760 if (IS_ERR(ctx))
2761 return -EAGAIN;
2762 ret = nfs4_do_open_expired(ctx, state);
2763 put_nfs_open_context(ctx);
2764 return ret;
2765 }
2766
nfs_finish_clear_delegation_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)2767 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2768 const nfs4_stateid *stateid)
2769 {
2770 nfs_remove_bad_delegation(state->inode, stateid);
2771 nfs_state_clear_delegation(state);
2772 }
2773
nfs40_clear_delegation_stateid(struct nfs4_state * state)2774 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2775 {
2776 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2777 nfs_finish_clear_delegation_stateid(state, NULL);
2778 }
2779
nfs40_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2780 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2781 {
2782 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2783 nfs40_clear_delegation_stateid(state);
2784 nfs_state_clear_open_state_flags(state);
2785 return nfs4_open_expired(sp, state);
2786 }
2787
nfs40_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2788 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2789 nfs4_stateid *stateid,
2790 const struct cred *cred)
2791 {
2792 return -NFS4ERR_BAD_STATEID;
2793 }
2794
2795 #if defined(CONFIG_NFS_V4_1)
nfs41_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2796 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2797 nfs4_stateid *stateid,
2798 const struct cred *cred)
2799 {
2800 int status;
2801
2802 switch (stateid->type) {
2803 default:
2804 break;
2805 case NFS4_INVALID_STATEID_TYPE:
2806 case NFS4_SPECIAL_STATEID_TYPE:
2807 return -NFS4ERR_BAD_STATEID;
2808 case NFS4_REVOKED_STATEID_TYPE:
2809 goto out_free;
2810 }
2811
2812 status = nfs41_test_stateid(server, stateid, cred);
2813 switch (status) {
2814 case -NFS4ERR_EXPIRED:
2815 case -NFS4ERR_ADMIN_REVOKED:
2816 case -NFS4ERR_DELEG_REVOKED:
2817 break;
2818 default:
2819 return status;
2820 }
2821 out_free:
2822 /* Ack the revoked state to the server */
2823 nfs41_free_stateid(server, stateid, cred, true);
2824 return -NFS4ERR_EXPIRED;
2825 }
2826
nfs41_check_delegation_stateid(struct nfs4_state * state)2827 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2828 {
2829 struct nfs_server *server = NFS_SERVER(state->inode);
2830 nfs4_stateid stateid;
2831 struct nfs_delegation *delegation;
2832 const struct cred *cred = NULL;
2833 int status, ret = NFS_OK;
2834
2835 /* Get the delegation credential for use by test/free_stateid */
2836 rcu_read_lock();
2837 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2838 if (delegation == NULL) {
2839 rcu_read_unlock();
2840 nfs_state_clear_delegation(state);
2841 return NFS_OK;
2842 }
2843
2844 spin_lock(&delegation->lock);
2845 nfs4_stateid_copy(&stateid, &delegation->stateid);
2846
2847 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2848 &delegation->flags)) {
2849 spin_unlock(&delegation->lock);
2850 rcu_read_unlock();
2851 return NFS_OK;
2852 }
2853
2854 if (delegation->cred)
2855 cred = get_cred(delegation->cred);
2856 spin_unlock(&delegation->lock);
2857 rcu_read_unlock();
2858 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2859 trace_nfs4_test_delegation_stateid(state, NULL, status);
2860 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2861 nfs_finish_clear_delegation_stateid(state, &stateid);
2862 else
2863 ret = status;
2864
2865 put_cred(cred);
2866 return ret;
2867 }
2868
nfs41_delegation_recover_stateid(struct nfs4_state * state)2869 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2870 {
2871 nfs4_stateid tmp;
2872
2873 if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2874 nfs4_copy_delegation_stateid(state->inode, state->state,
2875 &tmp, NULL) &&
2876 nfs4_stateid_match_other(&state->stateid, &tmp))
2877 nfs_state_set_delegation(state, &tmp, state->state);
2878 else
2879 nfs_state_clear_delegation(state);
2880 }
2881
2882 /**
2883 * nfs41_check_expired_locks - possibly free a lock stateid
2884 *
2885 * @state: NFSv4 state for an inode
2886 *
2887 * Returns NFS_OK if recovery for this stateid is now finished.
2888 * Otherwise a negative NFS4ERR value is returned.
2889 */
nfs41_check_expired_locks(struct nfs4_state * state)2890 static int nfs41_check_expired_locks(struct nfs4_state *state)
2891 {
2892 int status, ret = NFS_OK;
2893 struct nfs4_lock_state *lsp, *prev = NULL;
2894 struct nfs_server *server = NFS_SERVER(state->inode);
2895
2896 if (!test_bit(LK_STATE_IN_USE, &state->flags))
2897 goto out;
2898
2899 spin_lock(&state->state_lock);
2900 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2901 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2902 const struct cred *cred = lsp->ls_state->owner->so_cred;
2903
2904 refcount_inc(&lsp->ls_count);
2905 spin_unlock(&state->state_lock);
2906
2907 nfs4_put_lock_state(prev);
2908 prev = lsp;
2909
2910 status = nfs41_test_and_free_expired_stateid(server,
2911 &lsp->ls_stateid,
2912 cred);
2913 trace_nfs4_test_lock_stateid(state, lsp, status);
2914 if (status == -NFS4ERR_EXPIRED ||
2915 status == -NFS4ERR_BAD_STATEID) {
2916 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2917 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2918 if (!recover_lost_locks)
2919 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2920 } else if (status != NFS_OK) {
2921 ret = status;
2922 nfs4_put_lock_state(prev);
2923 goto out;
2924 }
2925 spin_lock(&state->state_lock);
2926 }
2927 }
2928 spin_unlock(&state->state_lock);
2929 nfs4_put_lock_state(prev);
2930 out:
2931 return ret;
2932 }
2933
2934 /**
2935 * nfs41_check_open_stateid - possibly free an open stateid
2936 *
2937 * @state: NFSv4 state for an inode
2938 *
2939 * Returns NFS_OK if recovery for this stateid is now finished.
2940 * Otherwise a negative NFS4ERR value is returned.
2941 */
nfs41_check_open_stateid(struct nfs4_state * state)2942 static int nfs41_check_open_stateid(struct nfs4_state *state)
2943 {
2944 struct nfs_server *server = NFS_SERVER(state->inode);
2945 nfs4_stateid *stateid = &state->open_stateid;
2946 const struct cred *cred = state->owner->so_cred;
2947 int status;
2948
2949 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2950 return -NFS4ERR_BAD_STATEID;
2951 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2952 trace_nfs4_test_open_stateid(state, NULL, status);
2953 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2954 nfs_state_clear_open_state_flags(state);
2955 stateid->type = NFS4_INVALID_STATEID_TYPE;
2956 return status;
2957 }
2958 if (nfs_open_stateid_recover_openmode(state))
2959 return -NFS4ERR_OPENMODE;
2960 return NFS_OK;
2961 }
2962
nfs41_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2963 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2964 {
2965 int status;
2966
2967 status = nfs41_check_delegation_stateid(state);
2968 if (status != NFS_OK)
2969 return status;
2970 nfs41_delegation_recover_stateid(state);
2971
2972 status = nfs41_check_expired_locks(state);
2973 if (status != NFS_OK)
2974 return status;
2975 status = nfs41_check_open_stateid(state);
2976 if (status != NFS_OK)
2977 status = nfs4_open_expired(sp, state);
2978 return status;
2979 }
2980 #endif
2981
2982 /*
2983 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2984 * fields corresponding to attributes that were used to store the verifier.
2985 * Make sure we clobber those fields in the later setattr call
2986 */
nfs4_exclusive_attrset(struct nfs4_opendata * opendata,struct iattr * sattr,struct nfs4_label ** label)2987 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2988 struct iattr *sattr, struct nfs4_label **label)
2989 {
2990 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2991 __u32 attrset[3];
2992 unsigned ret;
2993 unsigned i;
2994
2995 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2996 attrset[i] = opendata->o_res.attrset[i];
2997 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
2998 attrset[i] &= ~bitmask[i];
2999 }
3000
3001 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3002 sattr->ia_valid : 0;
3003
3004 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3005 if (sattr->ia_valid & ATTR_ATIME_SET)
3006 ret |= ATTR_ATIME_SET;
3007 else
3008 ret |= ATTR_ATIME;
3009 }
3010
3011 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3012 if (sattr->ia_valid & ATTR_MTIME_SET)
3013 ret |= ATTR_MTIME_SET;
3014 else
3015 ret |= ATTR_MTIME;
3016 }
3017
3018 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3019 *label = NULL;
3020 return ret;
3021 }
3022
_nfs4_open_and_get_state(struct nfs4_opendata * opendata,int flags,struct nfs_open_context * ctx)3023 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3024 int flags, struct nfs_open_context *ctx)
3025 {
3026 struct nfs4_state_owner *sp = opendata->owner;
3027 struct nfs_server *server = sp->so_server;
3028 struct dentry *dentry;
3029 struct nfs4_state *state;
3030 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3031 struct inode *dir = d_inode(opendata->dir);
3032 unsigned long dir_verifier;
3033 unsigned int seq;
3034 int ret;
3035
3036 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3037 dir_verifier = nfs_save_change_attribute(dir);
3038
3039 ret = _nfs4_proc_open(opendata, ctx);
3040 if (ret != 0)
3041 goto out;
3042
3043 state = _nfs4_opendata_to_nfs4_state(opendata);
3044 ret = PTR_ERR(state);
3045 if (IS_ERR(state))
3046 goto out;
3047 ctx->state = state;
3048 if (server->caps & NFS_CAP_POSIX_LOCK)
3049 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3050 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3051 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3052
3053 dentry = opendata->dentry;
3054 if (d_really_is_negative(dentry)) {
3055 struct dentry *alias;
3056 d_drop(dentry);
3057 alias = d_exact_alias(dentry, state->inode);
3058 if (!alias)
3059 alias = d_splice_alias(igrab(state->inode), dentry);
3060 /* d_splice_alias() can't fail here - it's a non-directory */
3061 if (alias) {
3062 dput(ctx->dentry);
3063 ctx->dentry = dentry = alias;
3064 }
3065 }
3066
3067 switch(opendata->o_arg.claim) {
3068 default:
3069 break;
3070 case NFS4_OPEN_CLAIM_NULL:
3071 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3072 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3073 if (!opendata->rpc_done)
3074 break;
3075 if (opendata->o_res.delegation_type != 0)
3076 dir_verifier = nfs_save_change_attribute(dir);
3077 nfs_set_verifier(dentry, dir_verifier);
3078 }
3079
3080 /* Parse layoutget results before we check for access */
3081 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3082
3083 ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3084 acc_mode, flags);
3085 if (ret != 0)
3086 goto out;
3087
3088 if (d_inode(dentry) == state->inode) {
3089 nfs_inode_attach_open_context(ctx);
3090 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3091 nfs4_schedule_stateid_recovery(server, state);
3092 }
3093
3094 out:
3095 if (!opendata->cancelled)
3096 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3097 return ret;
3098 }
3099
3100 /*
3101 * Returns a referenced nfs4_state
3102 */
_nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,const struct nfs4_open_createattrs * c,int * opened)3103 static int _nfs4_do_open(struct inode *dir,
3104 struct nfs_open_context *ctx,
3105 int flags,
3106 const struct nfs4_open_createattrs *c,
3107 int *opened)
3108 {
3109 struct nfs4_state_owner *sp;
3110 struct nfs4_state *state = NULL;
3111 struct nfs_server *server = NFS_SERVER(dir);
3112 struct nfs4_opendata *opendata;
3113 struct dentry *dentry = ctx->dentry;
3114 const struct cred *cred = ctx->cred;
3115 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3116 fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3117 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3118 struct iattr *sattr = c->sattr;
3119 struct nfs4_label *label = c->label;
3120 struct nfs4_label *olabel = NULL;
3121 int status;
3122
3123 /* Protect against reboot recovery conflicts */
3124 status = -ENOMEM;
3125 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3126 if (sp == NULL) {
3127 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3128 goto out_err;
3129 }
3130 status = nfs4_client_recover_expired_lease(server->nfs_client);
3131 if (status != 0)
3132 goto err_put_state_owner;
3133 if (d_really_is_positive(dentry))
3134 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3135 status = -ENOMEM;
3136 if (d_really_is_positive(dentry))
3137 claim = NFS4_OPEN_CLAIM_FH;
3138 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3139 c, claim, GFP_KERNEL);
3140 if (opendata == NULL)
3141 goto err_put_state_owner;
3142
3143 if (label) {
3144 olabel = nfs4_label_alloc(server, GFP_KERNEL);
3145 if (IS_ERR(olabel)) {
3146 status = PTR_ERR(olabel);
3147 goto err_opendata_put;
3148 }
3149 }
3150
3151 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3152 if (!opendata->f_attr.mdsthreshold) {
3153 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3154 if (!opendata->f_attr.mdsthreshold)
3155 goto err_free_label;
3156 }
3157 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3158 }
3159 if (d_really_is_positive(dentry))
3160 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3161
3162 status = _nfs4_open_and_get_state(opendata, flags, ctx);
3163 if (status != 0)
3164 goto err_free_label;
3165 state = ctx->state;
3166
3167 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3168 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3169 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3170 /*
3171 * send create attributes which was not set by open
3172 * with an extra setattr.
3173 */
3174 if (attrs || label) {
3175 unsigned ia_old = sattr->ia_valid;
3176
3177 sattr->ia_valid = attrs;
3178 nfs_fattr_init(opendata->o_res.f_attr);
3179 status = nfs4_do_setattr(state->inode, cred,
3180 opendata->o_res.f_attr, sattr,
3181 ctx, label, olabel);
3182 if (status == 0) {
3183 nfs_setattr_update_inode(state->inode, sattr,
3184 opendata->o_res.f_attr);
3185 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
3186 }
3187 sattr->ia_valid = ia_old;
3188 }
3189 }
3190 if (opened && opendata->file_created)
3191 *opened = 1;
3192
3193 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3194 *ctx_th = opendata->f_attr.mdsthreshold;
3195 opendata->f_attr.mdsthreshold = NULL;
3196 }
3197
3198 nfs4_label_free(olabel);
3199
3200 nfs4_opendata_put(opendata);
3201 nfs4_put_state_owner(sp);
3202 return 0;
3203 err_free_label:
3204 nfs4_label_free(olabel);
3205 err_opendata_put:
3206 nfs4_opendata_put(opendata);
3207 err_put_state_owner:
3208 nfs4_put_state_owner(sp);
3209 out_err:
3210 return status;
3211 }
3212
3213
nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,struct iattr * sattr,struct nfs4_label * label,int * opened)3214 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3215 struct nfs_open_context *ctx,
3216 int flags,
3217 struct iattr *sattr,
3218 struct nfs4_label *label,
3219 int *opened)
3220 {
3221 struct nfs_server *server = NFS_SERVER(dir);
3222 struct nfs4_exception exception = {
3223 .interruptible = true,
3224 };
3225 struct nfs4_state *res;
3226 struct nfs4_open_createattrs c = {
3227 .label = label,
3228 .sattr = sattr,
3229 .verf = {
3230 [0] = (__u32)jiffies,
3231 [1] = (__u32)current->pid,
3232 },
3233 };
3234 int status;
3235
3236 do {
3237 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3238 res = ctx->state;
3239 trace_nfs4_open_file(ctx, flags, status);
3240 if (status == 0)
3241 break;
3242 /* NOTE: BAD_SEQID means the server and client disagree about the
3243 * book-keeping w.r.t. state-changing operations
3244 * (OPEN/CLOSE/LOCK/LOCKU...)
3245 * It is actually a sign of a bug on the client or on the server.
3246 *
3247 * If we receive a BAD_SEQID error in the particular case of
3248 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3249 * have unhashed the old state_owner for us, and that we can
3250 * therefore safely retry using a new one. We should still warn
3251 * the user though...
3252 */
3253 if (status == -NFS4ERR_BAD_SEQID) {
3254 pr_warn_ratelimited("NFS: v4 server %s "
3255 " returned a bad sequence-id error!\n",
3256 NFS_SERVER(dir)->nfs_client->cl_hostname);
3257 exception.retry = 1;
3258 continue;
3259 }
3260 /*
3261 * BAD_STATEID on OPEN means that the server cancelled our
3262 * state before it received the OPEN_CONFIRM.
3263 * Recover by retrying the request as per the discussion
3264 * on Page 181 of RFC3530.
3265 */
3266 if (status == -NFS4ERR_BAD_STATEID) {
3267 exception.retry = 1;
3268 continue;
3269 }
3270 if (status == -NFS4ERR_EXPIRED) {
3271 nfs4_schedule_lease_recovery(server->nfs_client);
3272 exception.retry = 1;
3273 continue;
3274 }
3275 if (status == -EAGAIN) {
3276 /* We must have found a delegation */
3277 exception.retry = 1;
3278 continue;
3279 }
3280 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3281 continue;
3282 res = ERR_PTR(nfs4_handle_exception(server,
3283 status, &exception));
3284 } while (exception.retry);
3285 return res;
3286 }
3287
_nfs4_do_setattr(struct inode * inode,struct nfs_setattrargs * arg,struct nfs_setattrres * res,const struct cred * cred,struct nfs_open_context * ctx)3288 static int _nfs4_do_setattr(struct inode *inode,
3289 struct nfs_setattrargs *arg,
3290 struct nfs_setattrres *res,
3291 const struct cred *cred,
3292 struct nfs_open_context *ctx)
3293 {
3294 struct nfs_server *server = NFS_SERVER(inode);
3295 struct rpc_message msg = {
3296 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3297 .rpc_argp = arg,
3298 .rpc_resp = res,
3299 .rpc_cred = cred,
3300 };
3301 const struct cred *delegation_cred = NULL;
3302 unsigned long timestamp = jiffies;
3303 bool truncate;
3304 int status;
3305
3306 nfs_fattr_init(res->fattr);
3307
3308 /* Servers should only apply open mode checks for file size changes */
3309 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3310 if (!truncate) {
3311 nfs4_inode_make_writeable(inode);
3312 goto zero_stateid;
3313 }
3314
3315 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3316 /* Use that stateid */
3317 } else if (ctx != NULL && ctx->state) {
3318 struct nfs_lock_context *l_ctx;
3319 if (!nfs4_valid_open_stateid(ctx->state))
3320 return -EBADF;
3321 l_ctx = nfs_get_lock_context(ctx);
3322 if (IS_ERR(l_ctx))
3323 return PTR_ERR(l_ctx);
3324 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3325 &arg->stateid, &delegation_cred);
3326 nfs_put_lock_context(l_ctx);
3327 if (status == -EIO)
3328 return -EBADF;
3329 else if (status == -EAGAIN)
3330 goto zero_stateid;
3331 } else {
3332 zero_stateid:
3333 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3334 }
3335 if (delegation_cred)
3336 msg.rpc_cred = delegation_cred;
3337
3338 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3339
3340 put_cred(delegation_cred);
3341 if (status == 0 && ctx != NULL)
3342 renew_lease(server, timestamp);
3343 trace_nfs4_setattr(inode, &arg->stateid, status);
3344 return status;
3345 }
3346
nfs4_do_setattr(struct inode * inode,const struct cred * cred,struct nfs_fattr * fattr,struct iattr * sattr,struct nfs_open_context * ctx,struct nfs4_label * ilabel,struct nfs4_label * olabel)3347 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3348 struct nfs_fattr *fattr, struct iattr *sattr,
3349 struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3350 struct nfs4_label *olabel)
3351 {
3352 struct nfs_server *server = NFS_SERVER(inode);
3353 __u32 bitmask[NFS4_BITMASK_SZ];
3354 struct nfs4_state *state = ctx ? ctx->state : NULL;
3355 struct nfs_setattrargs arg = {
3356 .fh = NFS_FH(inode),
3357 .iap = sattr,
3358 .server = server,
3359 .bitmask = bitmask,
3360 .label = ilabel,
3361 };
3362 struct nfs_setattrres res = {
3363 .fattr = fattr,
3364 .label = olabel,
3365 .server = server,
3366 };
3367 struct nfs4_exception exception = {
3368 .state = state,
3369 .inode = inode,
3370 .stateid = &arg.stateid,
3371 };
3372 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3373 int err;
3374
3375 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3376 adjust_flags |= NFS_INO_INVALID_MODE;
3377 if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3378 adjust_flags |= NFS_INO_INVALID_OTHER;
3379
3380 do {
3381 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, olabel),
3382 inode, adjust_flags);
3383
3384 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3385 switch (err) {
3386 case -NFS4ERR_OPENMODE:
3387 if (!(sattr->ia_valid & ATTR_SIZE)) {
3388 pr_warn_once("NFSv4: server %s is incorrectly "
3389 "applying open mode checks to "
3390 "a SETATTR that is not "
3391 "changing file size.\n",
3392 server->nfs_client->cl_hostname);
3393 }
3394 if (state && !(state->state & FMODE_WRITE)) {
3395 err = -EBADF;
3396 if (sattr->ia_valid & ATTR_OPEN)
3397 err = -EACCES;
3398 goto out;
3399 }
3400 }
3401 err = nfs4_handle_exception(server, err, &exception);
3402 } while (exception.retry);
3403 out:
3404 return err;
3405 }
3406
3407 static bool
nfs4_wait_on_layoutreturn(struct inode * inode,struct rpc_task * task)3408 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3409 {
3410 if (inode == NULL || !nfs_have_layout(inode))
3411 return false;
3412
3413 return pnfs_wait_on_layoutreturn(inode, task);
3414 }
3415
3416 /*
3417 * Update the seqid of an open stateid
3418 */
nfs4_sync_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)3419 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3420 struct nfs4_state *state)
3421 {
3422 __be32 seqid_open;
3423 u32 dst_seqid;
3424 int seq;
3425
3426 for (;;) {
3427 if (!nfs4_valid_open_stateid(state))
3428 break;
3429 seq = read_seqbegin(&state->seqlock);
3430 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3431 nfs4_stateid_copy(dst, &state->open_stateid);
3432 if (read_seqretry(&state->seqlock, seq))
3433 continue;
3434 break;
3435 }
3436 seqid_open = state->open_stateid.seqid;
3437 if (read_seqretry(&state->seqlock, seq))
3438 continue;
3439
3440 dst_seqid = be32_to_cpu(dst->seqid);
3441 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3442 dst->seqid = seqid_open;
3443 break;
3444 }
3445 }
3446
3447 /*
3448 * Update the seqid of an open stateid after receiving
3449 * NFS4ERR_OLD_STATEID
3450 */
nfs4_refresh_open_old_stateid(nfs4_stateid * dst,struct nfs4_state * state)3451 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3452 struct nfs4_state *state)
3453 {
3454 __be32 seqid_open;
3455 u32 dst_seqid;
3456 bool ret;
3457 int seq, status = -EAGAIN;
3458 DEFINE_WAIT(wait);
3459
3460 for (;;) {
3461 ret = false;
3462 if (!nfs4_valid_open_stateid(state))
3463 break;
3464 seq = read_seqbegin(&state->seqlock);
3465 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3466 if (read_seqretry(&state->seqlock, seq))
3467 continue;
3468 break;
3469 }
3470
3471 write_seqlock(&state->seqlock);
3472 seqid_open = state->open_stateid.seqid;
3473
3474 dst_seqid = be32_to_cpu(dst->seqid);
3475
3476 /* Did another OPEN bump the state's seqid? try again: */
3477 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3478 dst->seqid = seqid_open;
3479 write_sequnlock(&state->seqlock);
3480 ret = true;
3481 break;
3482 }
3483
3484 /* server says we're behind but we haven't seen the update yet */
3485 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3486 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3487 write_sequnlock(&state->seqlock);
3488 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3489
3490 if (signal_pending(current))
3491 status = -EINTR;
3492 else
3493 if (schedule_timeout(5*HZ) != 0)
3494 status = 0;
3495
3496 finish_wait(&state->waitq, &wait);
3497
3498 if (!status)
3499 continue;
3500 if (status == -EINTR)
3501 break;
3502
3503 /* we slept the whole 5 seconds, we must have lost a seqid */
3504 dst->seqid = cpu_to_be32(dst_seqid + 1);
3505 ret = true;
3506 break;
3507 }
3508
3509 return ret;
3510 }
3511
3512 struct nfs4_closedata {
3513 struct inode *inode;
3514 struct nfs4_state *state;
3515 struct nfs_closeargs arg;
3516 struct nfs_closeres res;
3517 struct {
3518 struct nfs4_layoutreturn_args arg;
3519 struct nfs4_layoutreturn_res res;
3520 struct nfs4_xdr_opaque_data ld_private;
3521 u32 roc_barrier;
3522 bool roc;
3523 } lr;
3524 struct nfs_fattr fattr;
3525 unsigned long timestamp;
3526 };
3527
nfs4_free_closedata(void * data)3528 static void nfs4_free_closedata(void *data)
3529 {
3530 struct nfs4_closedata *calldata = data;
3531 struct nfs4_state_owner *sp = calldata->state->owner;
3532 struct super_block *sb = calldata->state->inode->i_sb;
3533
3534 if (calldata->lr.roc)
3535 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3536 calldata->res.lr_ret);
3537 nfs4_put_open_state(calldata->state);
3538 nfs_free_seqid(calldata->arg.seqid);
3539 nfs4_put_state_owner(sp);
3540 nfs_sb_deactive(sb);
3541 kfree(calldata);
3542 }
3543
nfs4_close_done(struct rpc_task * task,void * data)3544 static void nfs4_close_done(struct rpc_task *task, void *data)
3545 {
3546 struct nfs4_closedata *calldata = data;
3547 struct nfs4_state *state = calldata->state;
3548 struct nfs_server *server = NFS_SERVER(calldata->inode);
3549 nfs4_stateid *res_stateid = NULL;
3550 struct nfs4_exception exception = {
3551 .state = state,
3552 .inode = calldata->inode,
3553 .stateid = &calldata->arg.stateid,
3554 };
3555
3556 dprintk("%s: begin!\n", __func__);
3557 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3558 return;
3559 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3560
3561 /* Handle Layoutreturn errors */
3562 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3563 &calldata->res.lr_ret) == -EAGAIN)
3564 goto out_restart;
3565
3566 /* hmm. we are done with the inode, and in the process of freeing
3567 * the state_owner. we keep this around to process errors
3568 */
3569 switch (task->tk_status) {
3570 case 0:
3571 res_stateid = &calldata->res.stateid;
3572 renew_lease(server, calldata->timestamp);
3573 break;
3574 case -NFS4ERR_ACCESS:
3575 if (calldata->arg.bitmask != NULL) {
3576 calldata->arg.bitmask = NULL;
3577 calldata->res.fattr = NULL;
3578 goto out_restart;
3579
3580 }
3581 break;
3582 case -NFS4ERR_OLD_STATEID:
3583 /* Did we race with OPEN? */
3584 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3585 state))
3586 goto out_restart;
3587 goto out_release;
3588 case -NFS4ERR_ADMIN_REVOKED:
3589 case -NFS4ERR_STALE_STATEID:
3590 case -NFS4ERR_EXPIRED:
3591 nfs4_free_revoked_stateid(server,
3592 &calldata->arg.stateid,
3593 task->tk_msg.rpc_cred);
3594 fallthrough;
3595 case -NFS4ERR_BAD_STATEID:
3596 if (calldata->arg.fmode == 0)
3597 break;
3598 fallthrough;
3599 default:
3600 task->tk_status = nfs4_async_handle_exception(task,
3601 server, task->tk_status, &exception);
3602 if (exception.retry)
3603 goto out_restart;
3604 }
3605 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3606 res_stateid, calldata->arg.fmode);
3607 out_release:
3608 task->tk_status = 0;
3609 nfs_release_seqid(calldata->arg.seqid);
3610 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3611 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3612 return;
3613 out_restart:
3614 task->tk_status = 0;
3615 rpc_restart_call_prepare(task);
3616 goto out_release;
3617 }
3618
nfs4_close_prepare(struct rpc_task * task,void * data)3619 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3620 {
3621 struct nfs4_closedata *calldata = data;
3622 struct nfs4_state *state = calldata->state;
3623 struct inode *inode = calldata->inode;
3624 struct nfs_server *server = NFS_SERVER(inode);
3625 struct pnfs_layout_hdr *lo;
3626 bool is_rdonly, is_wronly, is_rdwr;
3627 int call_close = 0;
3628
3629 dprintk("%s: begin!\n", __func__);
3630 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3631 goto out_wait;
3632
3633 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3634 spin_lock(&state->owner->so_lock);
3635 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3636 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3637 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3638 /* Calculate the change in open mode */
3639 calldata->arg.fmode = 0;
3640 if (state->n_rdwr == 0) {
3641 if (state->n_rdonly == 0)
3642 call_close |= is_rdonly;
3643 else if (is_rdonly)
3644 calldata->arg.fmode |= FMODE_READ;
3645 if (state->n_wronly == 0)
3646 call_close |= is_wronly;
3647 else if (is_wronly)
3648 calldata->arg.fmode |= FMODE_WRITE;
3649 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3650 call_close |= is_rdwr;
3651 } else if (is_rdwr)
3652 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3653
3654 nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3655 if (!nfs4_valid_open_stateid(state))
3656 call_close = 0;
3657 spin_unlock(&state->owner->so_lock);
3658
3659 if (!call_close) {
3660 /* Note: exit _without_ calling nfs4_close_done */
3661 goto out_no_action;
3662 }
3663
3664 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3665 nfs_release_seqid(calldata->arg.seqid);
3666 goto out_wait;
3667 }
3668
3669 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3670 if (lo && !pnfs_layout_is_valid(lo)) {
3671 calldata->arg.lr_args = NULL;
3672 calldata->res.lr_res = NULL;
3673 }
3674
3675 if (calldata->arg.fmode == 0)
3676 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3677
3678 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3679 /* Close-to-open cache consistency revalidation */
3680 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3681 nfs4_bitmask_set(calldata->arg.bitmask_store,
3682 server->cache_consistency_bitmask,
3683 inode, server, NULL);
3684 calldata->arg.bitmask = calldata->arg.bitmask_store;
3685 } else
3686 calldata->arg.bitmask = NULL;
3687 }
3688
3689 calldata->arg.share_access =
3690 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3691 calldata->arg.fmode, 0);
3692
3693 if (calldata->res.fattr == NULL)
3694 calldata->arg.bitmask = NULL;
3695 else if (calldata->arg.bitmask == NULL)
3696 calldata->res.fattr = NULL;
3697 calldata->timestamp = jiffies;
3698 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3699 &calldata->arg.seq_args,
3700 &calldata->res.seq_res,
3701 task) != 0)
3702 nfs_release_seqid(calldata->arg.seqid);
3703 dprintk("%s: done!\n", __func__);
3704 return;
3705 out_no_action:
3706 task->tk_action = NULL;
3707 out_wait:
3708 nfs4_sequence_done(task, &calldata->res.seq_res);
3709 }
3710
3711 static const struct rpc_call_ops nfs4_close_ops = {
3712 .rpc_call_prepare = nfs4_close_prepare,
3713 .rpc_call_done = nfs4_close_done,
3714 .rpc_release = nfs4_free_closedata,
3715 };
3716
3717 /*
3718 * It is possible for data to be read/written from a mem-mapped file
3719 * after the sys_close call (which hits the vfs layer as a flush).
3720 * This means that we can't safely call nfsv4 close on a file until
3721 * the inode is cleared. This in turn means that we are not good
3722 * NFSv4 citizens - we do not indicate to the server to update the file's
3723 * share state even when we are done with one of the three share
3724 * stateid's in the inode.
3725 *
3726 * NOTE: Caller must be holding the sp->so_owner semaphore!
3727 */
nfs4_do_close(struct nfs4_state * state,gfp_t gfp_mask,int wait)3728 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3729 {
3730 struct nfs_server *server = NFS_SERVER(state->inode);
3731 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3732 struct nfs4_closedata *calldata;
3733 struct nfs4_state_owner *sp = state->owner;
3734 struct rpc_task *task;
3735 struct rpc_message msg = {
3736 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3737 .rpc_cred = state->owner->so_cred,
3738 };
3739 struct rpc_task_setup task_setup_data = {
3740 .rpc_client = server->client,
3741 .rpc_message = &msg,
3742 .callback_ops = &nfs4_close_ops,
3743 .workqueue = nfsiod_workqueue,
3744 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3745 };
3746 int status = -ENOMEM;
3747
3748 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3749 &task_setup_data.rpc_client, &msg);
3750
3751 calldata = kzalloc(sizeof(*calldata), gfp_mask);
3752 if (calldata == NULL)
3753 goto out;
3754 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3755 calldata->inode = state->inode;
3756 calldata->state = state;
3757 calldata->arg.fh = NFS_FH(state->inode);
3758 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3759 goto out_free_calldata;
3760 /* Serialization for the sequence id */
3761 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3762 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3763 if (IS_ERR(calldata->arg.seqid))
3764 goto out_free_calldata;
3765 nfs_fattr_init(&calldata->fattr);
3766 calldata->arg.fmode = 0;
3767 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3768 calldata->res.fattr = &calldata->fattr;
3769 calldata->res.seqid = calldata->arg.seqid;
3770 calldata->res.server = server;
3771 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3772 calldata->lr.roc = pnfs_roc(state->inode,
3773 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3774 if (calldata->lr.roc) {
3775 calldata->arg.lr_args = &calldata->lr.arg;
3776 calldata->res.lr_res = &calldata->lr.res;
3777 }
3778 nfs_sb_active(calldata->inode->i_sb);
3779
3780 msg.rpc_argp = &calldata->arg;
3781 msg.rpc_resp = &calldata->res;
3782 task_setup_data.callback_data = calldata;
3783 task = rpc_run_task(&task_setup_data);
3784 if (IS_ERR(task))
3785 return PTR_ERR(task);
3786 status = 0;
3787 if (wait)
3788 status = rpc_wait_for_completion_task(task);
3789 rpc_put_task(task);
3790 return status;
3791 out_free_calldata:
3792 kfree(calldata);
3793 out:
3794 nfs4_put_open_state(state);
3795 nfs4_put_state_owner(sp);
3796 return status;
3797 }
3798
3799 static struct inode *
nfs4_atomic_open(struct inode * dir,struct nfs_open_context * ctx,int open_flags,struct iattr * attr,int * opened)3800 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3801 int open_flags, struct iattr *attr, int *opened)
3802 {
3803 struct nfs4_state *state;
3804 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3805
3806 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3807
3808 /* Protect against concurrent sillydeletes */
3809 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3810
3811 nfs4_label_release_security(label);
3812
3813 if (IS_ERR(state))
3814 return ERR_CAST(state);
3815 return state->inode;
3816 }
3817
nfs4_close_context(struct nfs_open_context * ctx,int is_sync)3818 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3819 {
3820 if (ctx->state == NULL)
3821 return;
3822 if (is_sync)
3823 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3824 else
3825 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3826 }
3827
3828 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3829 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3830 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3831
_nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3832 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3833 {
3834 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3835 struct nfs4_server_caps_arg args = {
3836 .fhandle = fhandle,
3837 .bitmask = bitmask,
3838 };
3839 struct nfs4_server_caps_res res = {};
3840 struct rpc_message msg = {
3841 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3842 .rpc_argp = &args,
3843 .rpc_resp = &res,
3844 };
3845 int status;
3846 int i;
3847
3848 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3849 FATTR4_WORD0_FH_EXPIRE_TYPE |
3850 FATTR4_WORD0_LINK_SUPPORT |
3851 FATTR4_WORD0_SYMLINK_SUPPORT |
3852 FATTR4_WORD0_ACLSUPPORT;
3853 if (minorversion)
3854 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3855
3856 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3857 if (status == 0) {
3858 /* Sanity check the server answers */
3859 switch (minorversion) {
3860 case 0:
3861 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3862 res.attr_bitmask[2] = 0;
3863 break;
3864 case 1:
3865 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3866 break;
3867 case 2:
3868 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3869 }
3870 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3871 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3872 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3873 server->fattr_valid = NFS_ATTR_FATTR_V4;
3874 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3875 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3876 server->caps |= NFS_CAP_ACLS;
3877 if (res.has_links != 0)
3878 server->caps |= NFS_CAP_HARDLINKS;
3879 if (res.has_symlinks != 0)
3880 server->caps |= NFS_CAP_SYMLINKS;
3881 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3882 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3883 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3884 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3885 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3886 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3887 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3888 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3889 NFS_ATTR_FATTR_OWNER_NAME);
3890 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3891 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3892 NFS_ATTR_FATTR_GROUP_NAME);
3893 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3894 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3895 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3896 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3897 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3898 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3899 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3900 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3901 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3902 if (!(res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL))
3903 server->fattr_valid &= ~NFS_ATTR_FATTR_V4_SECURITY_LABEL;
3904 #endif
3905 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3906 sizeof(server->attr_bitmask));
3907 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3908
3909 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3910 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3911 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3912 server->cache_consistency_bitmask[2] = 0;
3913
3914 /* Avoid a regression due to buggy server */
3915 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3916 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3917 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3918 sizeof(server->exclcreat_bitmask));
3919
3920 server->acl_bitmask = res.acl_bitmask;
3921 server->fh_expire_type = res.fh_expire_type;
3922 }
3923
3924 return status;
3925 }
3926
nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3927 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3928 {
3929 struct nfs4_exception exception = {
3930 .interruptible = true,
3931 };
3932 int err;
3933 do {
3934 err = nfs4_handle_exception(server,
3935 _nfs4_server_capabilities(server, fhandle),
3936 &exception);
3937 } while (exception.retry);
3938 return err;
3939 }
3940
_nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)3941 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3942 struct nfs_fsinfo *info)
3943 {
3944 u32 bitmask[3];
3945 struct nfs4_lookup_root_arg args = {
3946 .bitmask = bitmask,
3947 };
3948 struct nfs4_lookup_res res = {
3949 .server = server,
3950 .fattr = info->fattr,
3951 .fh = fhandle,
3952 };
3953 struct rpc_message msg = {
3954 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3955 .rpc_argp = &args,
3956 .rpc_resp = &res,
3957 };
3958
3959 bitmask[0] = nfs4_fattr_bitmap[0];
3960 bitmask[1] = nfs4_fattr_bitmap[1];
3961 /*
3962 * Process the label in the upcoming getfattr
3963 */
3964 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3965
3966 nfs_fattr_init(info->fattr);
3967 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3968 }
3969
nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)3970 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3971 struct nfs_fsinfo *info)
3972 {
3973 struct nfs4_exception exception = {
3974 .interruptible = true,
3975 };
3976 int err;
3977 do {
3978 err = _nfs4_lookup_root(server, fhandle, info);
3979 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3980 switch (err) {
3981 case 0:
3982 case -NFS4ERR_WRONGSEC:
3983 goto out;
3984 default:
3985 err = nfs4_handle_exception(server, err, &exception);
3986 }
3987 } while (exception.retry);
3988 out:
3989 return err;
3990 }
3991
nfs4_lookup_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,rpc_authflavor_t flavor)3992 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3993 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3994 {
3995 struct rpc_auth_create_args auth_args = {
3996 .pseudoflavor = flavor,
3997 };
3998 struct rpc_auth *auth;
3999
4000 auth = rpcauth_create(&auth_args, server->client);
4001 if (IS_ERR(auth))
4002 return -EACCES;
4003 return nfs4_lookup_root(server, fhandle, info);
4004 }
4005
4006 /*
4007 * Retry pseudoroot lookup with various security flavors. We do this when:
4008 *
4009 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4010 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4011 *
4012 * Returns zero on success, or a negative NFS4ERR value, or a
4013 * negative errno value.
4014 */
nfs4_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4015 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4016 struct nfs_fsinfo *info)
4017 {
4018 /* Per 3530bis 15.33.5 */
4019 static const rpc_authflavor_t flav_array[] = {
4020 RPC_AUTH_GSS_KRB5P,
4021 RPC_AUTH_GSS_KRB5I,
4022 RPC_AUTH_GSS_KRB5,
4023 RPC_AUTH_UNIX, /* courtesy */
4024 RPC_AUTH_NULL,
4025 };
4026 int status = -EPERM;
4027 size_t i;
4028
4029 if (server->auth_info.flavor_len > 0) {
4030 /* try each flavor specified by user */
4031 for (i = 0; i < server->auth_info.flavor_len; i++) {
4032 status = nfs4_lookup_root_sec(server, fhandle, info,
4033 server->auth_info.flavors[i]);
4034 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4035 continue;
4036 break;
4037 }
4038 } else {
4039 /* no flavors specified by user, try default list */
4040 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4041 status = nfs4_lookup_root_sec(server, fhandle, info,
4042 flav_array[i]);
4043 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4044 continue;
4045 break;
4046 }
4047 }
4048
4049 /*
4050 * -EACCES could mean that the user doesn't have correct permissions
4051 * to access the mount. It could also mean that we tried to mount
4052 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
4053 * existing mount programs don't handle -EACCES very well so it should
4054 * be mapped to -EPERM instead.
4055 */
4056 if (status == -EACCES)
4057 status = -EPERM;
4058 return status;
4059 }
4060
4061 /**
4062 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4063 * @server: initialized nfs_server handle
4064 * @fhandle: we fill in the pseudo-fs root file handle
4065 * @info: we fill in an FSINFO struct
4066 * @auth_probe: probe the auth flavours
4067 *
4068 * Returns zero on success, or a negative errno.
4069 */
nfs4_proc_get_rootfh(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,bool auth_probe)4070 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4071 struct nfs_fsinfo *info,
4072 bool auth_probe)
4073 {
4074 int status = 0;
4075
4076 if (!auth_probe)
4077 status = nfs4_lookup_root(server, fhandle, info);
4078
4079 if (auth_probe || status == NFS4ERR_WRONGSEC)
4080 status = server->nfs_client->cl_mvops->find_root_sec(server,
4081 fhandle, info);
4082
4083 if (status == 0)
4084 status = nfs4_server_capabilities(server, fhandle);
4085 if (status == 0)
4086 status = nfs4_do_fsinfo(server, fhandle, info);
4087
4088 return nfs4_map_errors(status);
4089 }
4090
nfs4_proc_get_root(struct nfs_server * server,struct nfs_fh * mntfh,struct nfs_fsinfo * info)4091 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4092 struct nfs_fsinfo *info)
4093 {
4094 int error;
4095 struct nfs_fattr *fattr = info->fattr;
4096 struct nfs4_label *label = fattr->label;
4097
4098 error = nfs4_server_capabilities(server, mntfh);
4099 if (error < 0) {
4100 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4101 return error;
4102 }
4103
4104 error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL);
4105 if (error < 0) {
4106 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4107 goto out;
4108 }
4109
4110 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4111 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4112 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4113
4114 out:
4115 return error;
4116 }
4117
4118 /*
4119 * Get locations and (maybe) other attributes of a referral.
4120 * Note that we'll actually follow the referral later when
4121 * we detect fsid mismatch in inode revalidation
4122 */
nfs4_get_referral(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs_fattr * fattr,struct nfs_fh * fhandle)4123 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4124 const struct qstr *name, struct nfs_fattr *fattr,
4125 struct nfs_fh *fhandle)
4126 {
4127 int status = -ENOMEM;
4128 struct page *page = NULL;
4129 struct nfs4_fs_locations *locations = NULL;
4130
4131 page = alloc_page(GFP_KERNEL);
4132 if (page == NULL)
4133 goto out;
4134 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4135 if (locations == NULL)
4136 goto out;
4137
4138 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4139 if (status != 0)
4140 goto out;
4141
4142 /*
4143 * If the fsid didn't change, this is a migration event, not a
4144 * referral. Cause us to drop into the exception handler, which
4145 * will kick off migration recovery.
4146 */
4147 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
4148 dprintk("%s: server did not return a different fsid for"
4149 " a referral at %s\n", __func__, name->name);
4150 status = -NFS4ERR_MOVED;
4151 goto out;
4152 }
4153 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4154 nfs_fixup_referral_attributes(&locations->fattr);
4155
4156 /* replace the lookup nfs_fattr with the locations nfs_fattr */
4157 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
4158 memset(fhandle, 0, sizeof(struct nfs_fh));
4159 out:
4160 if (page)
4161 __free_page(page);
4162 kfree(locations);
4163 return status;
4164 }
4165
_nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label,struct inode * inode)4166 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4167 struct nfs_fattr *fattr, struct nfs4_label *label,
4168 struct inode *inode)
4169 {
4170 __u32 bitmask[NFS4_BITMASK_SZ];
4171 struct nfs4_getattr_arg args = {
4172 .fh = fhandle,
4173 .bitmask = bitmask,
4174 };
4175 struct nfs4_getattr_res res = {
4176 .fattr = fattr,
4177 .label = label,
4178 .server = server,
4179 };
4180 struct rpc_message msg = {
4181 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4182 .rpc_argp = &args,
4183 .rpc_resp = &res,
4184 };
4185 unsigned short task_flags = 0;
4186
4187 /* Is this is an attribute revalidation, subject to softreval? */
4188 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4189 task_flags |= RPC_TASK_TIMEOUT;
4190
4191 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode, 0);
4192 nfs_fattr_init(fattr);
4193 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4194 return nfs4_do_call_sync(server->client, server, &msg,
4195 &args.seq_args, &res.seq_res, task_flags);
4196 }
4197
nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label,struct inode * inode)4198 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4199 struct nfs_fattr *fattr, struct nfs4_label *label,
4200 struct inode *inode)
4201 {
4202 struct nfs4_exception exception = {
4203 .interruptible = true,
4204 };
4205 int err;
4206 do {
4207 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode);
4208 trace_nfs4_getattr(server, fhandle, fattr, err);
4209 err = nfs4_handle_exception(server, err,
4210 &exception);
4211 } while (exception.retry);
4212 return err;
4213 }
4214
4215 /*
4216 * The file is not closed if it is opened due to the a request to change
4217 * the size of the file. The open call will not be needed once the
4218 * VFS layer lookup-intents are implemented.
4219 *
4220 * Close is called when the inode is destroyed.
4221 * If we haven't opened the file for O_WRONLY, we
4222 * need to in the size_change case to obtain a stateid.
4223 *
4224 * Got race?
4225 * Because OPEN is always done by name in nfsv4, it is
4226 * possible that we opened a different file by the same
4227 * name. We can recognize this race condition, but we
4228 * can't do anything about it besides returning an error.
4229 *
4230 * This will be fixed with VFS changes (lookup-intent).
4231 */
4232 static int
nfs4_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)4233 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4234 struct iattr *sattr)
4235 {
4236 struct inode *inode = d_inode(dentry);
4237 const struct cred *cred = NULL;
4238 struct nfs_open_context *ctx = NULL;
4239 struct nfs4_label *label = NULL;
4240 int status;
4241
4242 if (pnfs_ld_layoutret_on_setattr(inode) &&
4243 sattr->ia_valid & ATTR_SIZE &&
4244 sattr->ia_size < i_size_read(inode))
4245 pnfs_commit_and_return_layout(inode);
4246
4247 nfs_fattr_init(fattr);
4248
4249 /* Deal with open(O_TRUNC) */
4250 if (sattr->ia_valid & ATTR_OPEN)
4251 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4252
4253 /* Optimization: if the end result is no change, don't RPC */
4254 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4255 return 0;
4256
4257 /* Search for an existing open(O_WRITE) file */
4258 if (sattr->ia_valid & ATTR_FILE) {
4259
4260 ctx = nfs_file_open_context(sattr->ia_file);
4261 if (ctx)
4262 cred = ctx->cred;
4263 }
4264
4265 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4266 if (IS_ERR(label))
4267 return PTR_ERR(label);
4268
4269 /* Return any delegations if we're going to change ACLs */
4270 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4271 nfs4_inode_make_writeable(inode);
4272
4273 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
4274 if (status == 0) {
4275 nfs_setattr_update_inode(inode, sattr, fattr);
4276 nfs_setsecurity(inode, fattr, label);
4277 }
4278 nfs4_label_free(label);
4279 return status;
4280 }
4281
_nfs4_proc_lookup(struct rpc_clnt * clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label)4282 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4283 struct dentry *dentry, struct nfs_fh *fhandle,
4284 struct nfs_fattr *fattr, struct nfs4_label *label)
4285 {
4286 struct nfs_server *server = NFS_SERVER(dir);
4287 int status;
4288 struct nfs4_lookup_arg args = {
4289 .bitmask = server->attr_bitmask,
4290 .dir_fh = NFS_FH(dir),
4291 .name = &dentry->d_name,
4292 };
4293 struct nfs4_lookup_res res = {
4294 .server = server,
4295 .fattr = fattr,
4296 .label = label,
4297 .fh = fhandle,
4298 };
4299 struct rpc_message msg = {
4300 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4301 .rpc_argp = &args,
4302 .rpc_resp = &res,
4303 };
4304 unsigned short task_flags = 0;
4305
4306 /* Is this is an attribute revalidation, subject to softreval? */
4307 if (nfs_lookup_is_soft_revalidate(dentry))
4308 task_flags |= RPC_TASK_TIMEOUT;
4309
4310 args.bitmask = nfs4_bitmask(server, label);
4311
4312 nfs_fattr_init(fattr);
4313
4314 dprintk("NFS call lookup %pd2\n", dentry);
4315 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4316 status = nfs4_do_call_sync(clnt, server, &msg,
4317 &args.seq_args, &res.seq_res, task_flags);
4318 dprintk("NFS reply lookup: %d\n", status);
4319 return status;
4320 }
4321
nfs_fixup_secinfo_attributes(struct nfs_fattr * fattr)4322 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4323 {
4324 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4325 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4326 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4327 fattr->nlink = 2;
4328 }
4329
nfs4_proc_lookup_common(struct rpc_clnt ** clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label)4330 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4331 struct dentry *dentry, struct nfs_fh *fhandle,
4332 struct nfs_fattr *fattr, struct nfs4_label *label)
4333 {
4334 struct nfs4_exception exception = {
4335 .interruptible = true,
4336 };
4337 struct rpc_clnt *client = *clnt;
4338 const struct qstr *name = &dentry->d_name;
4339 int err;
4340 do {
4341 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr, label);
4342 trace_nfs4_lookup(dir, name, err);
4343 switch (err) {
4344 case -NFS4ERR_BADNAME:
4345 err = -ENOENT;
4346 goto out;
4347 case -NFS4ERR_MOVED:
4348 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4349 if (err == -NFS4ERR_MOVED)
4350 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4351 goto out;
4352 case -NFS4ERR_WRONGSEC:
4353 err = -EPERM;
4354 if (client != *clnt)
4355 goto out;
4356 client = nfs4_negotiate_security(client, dir, name);
4357 if (IS_ERR(client))
4358 return PTR_ERR(client);
4359
4360 exception.retry = 1;
4361 break;
4362 default:
4363 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4364 }
4365 } while (exception.retry);
4366
4367 out:
4368 if (err == 0)
4369 *clnt = client;
4370 else if (client != *clnt)
4371 rpc_shutdown_client(client);
4372
4373 return err;
4374 }
4375
nfs4_proc_lookup(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label)4376 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4377 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4378 struct nfs4_label *label)
4379 {
4380 int status;
4381 struct rpc_clnt *client = NFS_CLIENT(dir);
4382
4383 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, label);
4384 if (client != NFS_CLIENT(dir)) {
4385 rpc_shutdown_client(client);
4386 nfs_fixup_secinfo_attributes(fattr);
4387 }
4388 return status;
4389 }
4390
4391 struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4392 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4393 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4394 {
4395 struct rpc_clnt *client = NFS_CLIENT(dir);
4396 int status;
4397
4398 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, NULL);
4399 if (status < 0)
4400 return ERR_PTR(status);
4401 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4402 }
4403
_nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label)4404 static int _nfs4_proc_lookupp(struct inode *inode,
4405 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4406 struct nfs4_label *label)
4407 {
4408 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4409 struct nfs_server *server = NFS_SERVER(inode);
4410 int status;
4411 struct nfs4_lookupp_arg args = {
4412 .bitmask = server->attr_bitmask,
4413 .fh = NFS_FH(inode),
4414 };
4415 struct nfs4_lookupp_res res = {
4416 .server = server,
4417 .fattr = fattr,
4418 .label = label,
4419 .fh = fhandle,
4420 };
4421 struct rpc_message msg = {
4422 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4423 .rpc_argp = &args,
4424 .rpc_resp = &res,
4425 };
4426 unsigned short task_flags = 0;
4427
4428 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4429 task_flags |= RPC_TASK_TIMEOUT;
4430
4431 args.bitmask = nfs4_bitmask(server, label);
4432
4433 nfs_fattr_init(fattr);
4434
4435 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino);
4436 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4437 &res.seq_res, task_flags);
4438 dprintk("NFS reply lookupp: %d\n", status);
4439 return status;
4440 }
4441
nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label)4442 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4443 struct nfs_fattr *fattr, struct nfs4_label *label)
4444 {
4445 struct nfs4_exception exception = {
4446 .interruptible = true,
4447 };
4448 int err;
4449 do {
4450 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4451 trace_nfs4_lookupp(inode, err);
4452 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4453 &exception);
4454 } while (exception.retry);
4455 return err;
4456 }
4457
_nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry)4458 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4459 {
4460 struct nfs_server *server = NFS_SERVER(inode);
4461 struct nfs4_accessargs args = {
4462 .fh = NFS_FH(inode),
4463 .access = entry->mask,
4464 };
4465 struct nfs4_accessres res = {
4466 .server = server,
4467 };
4468 struct rpc_message msg = {
4469 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4470 .rpc_argp = &args,
4471 .rpc_resp = &res,
4472 .rpc_cred = entry->cred,
4473 };
4474 int status = 0;
4475
4476 if (!nfs4_have_delegation(inode, FMODE_READ)) {
4477 res.fattr = nfs_alloc_fattr();
4478 if (res.fattr == NULL)
4479 return -ENOMEM;
4480 args.bitmask = server->cache_consistency_bitmask;
4481 }
4482 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4483 if (!status) {
4484 nfs_access_set_mask(entry, res.access);
4485 if (res.fattr)
4486 nfs_refresh_inode(inode, res.fattr);
4487 }
4488 nfs_free_fattr(res.fattr);
4489 return status;
4490 }
4491
nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry)4492 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4493 {
4494 struct nfs4_exception exception = {
4495 .interruptible = true,
4496 };
4497 int err;
4498 do {
4499 err = _nfs4_proc_access(inode, entry);
4500 trace_nfs4_access(inode, err);
4501 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4502 &exception);
4503 } while (exception.retry);
4504 return err;
4505 }
4506
4507 /*
4508 * TODO: For the time being, we don't try to get any attributes
4509 * along with any of the zero-copy operations READ, READDIR,
4510 * READLINK, WRITE.
4511 *
4512 * In the case of the first three, we want to put the GETATTR
4513 * after the read-type operation -- this is because it is hard
4514 * to predict the length of a GETATTR response in v4, and thus
4515 * align the READ data correctly. This means that the GETATTR
4516 * may end up partially falling into the page cache, and we should
4517 * shift it into the 'tail' of the xdr_buf before processing.
4518 * To do this efficiently, we need to know the total length
4519 * of data received, which doesn't seem to be available outside
4520 * of the RPC layer.
4521 *
4522 * In the case of WRITE, we also want to put the GETATTR after
4523 * the operation -- in this case because we want to make sure
4524 * we get the post-operation mtime and size.
4525 *
4526 * Both of these changes to the XDR layer would in fact be quite
4527 * minor, but I decided to leave them for a subsequent patch.
4528 */
_nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4529 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4530 unsigned int pgbase, unsigned int pglen)
4531 {
4532 struct nfs4_readlink args = {
4533 .fh = NFS_FH(inode),
4534 .pgbase = pgbase,
4535 .pglen = pglen,
4536 .pages = &page,
4537 };
4538 struct nfs4_readlink_res res;
4539 struct rpc_message msg = {
4540 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4541 .rpc_argp = &args,
4542 .rpc_resp = &res,
4543 };
4544
4545 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4546 }
4547
nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4548 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4549 unsigned int pgbase, unsigned int pglen)
4550 {
4551 struct nfs4_exception exception = {
4552 .interruptible = true,
4553 };
4554 int err;
4555 do {
4556 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4557 trace_nfs4_readlink(inode, err);
4558 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4559 &exception);
4560 } while (exception.retry);
4561 return err;
4562 }
4563
4564 /*
4565 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4566 */
4567 static int
nfs4_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)4568 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4569 int flags)
4570 {
4571 struct nfs_server *server = NFS_SERVER(dir);
4572 struct nfs4_label l, *ilabel = NULL;
4573 struct nfs_open_context *ctx;
4574 struct nfs4_state *state;
4575 int status = 0;
4576
4577 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4578 if (IS_ERR(ctx))
4579 return PTR_ERR(ctx);
4580
4581 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4582
4583 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4584 sattr->ia_mode &= ~current_umask();
4585 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4586 if (IS_ERR(state)) {
4587 status = PTR_ERR(state);
4588 goto out;
4589 }
4590 out:
4591 nfs4_label_release_security(ilabel);
4592 put_nfs_open_context(ctx);
4593 return status;
4594 }
4595
4596 static int
_nfs4_proc_remove(struct inode * dir,const struct qstr * name,u32 ftype)4597 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4598 {
4599 struct nfs_server *server = NFS_SERVER(dir);
4600 struct nfs_removeargs args = {
4601 .fh = NFS_FH(dir),
4602 .name = *name,
4603 };
4604 struct nfs_removeres res = {
4605 .server = server,
4606 };
4607 struct rpc_message msg = {
4608 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4609 .rpc_argp = &args,
4610 .rpc_resp = &res,
4611 };
4612 unsigned long timestamp = jiffies;
4613 int status;
4614
4615 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4616 if (status == 0) {
4617 spin_lock(&dir->i_lock);
4618 /* Removing a directory decrements nlink in the parent */
4619 if (ftype == NF4DIR && dir->i_nlink > 2)
4620 nfs4_dec_nlink_locked(dir);
4621 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4622 NFS_INO_INVALID_DATA);
4623 spin_unlock(&dir->i_lock);
4624 }
4625 return status;
4626 }
4627
nfs4_proc_remove(struct inode * dir,struct dentry * dentry)4628 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4629 {
4630 struct nfs4_exception exception = {
4631 .interruptible = true,
4632 };
4633 struct inode *inode = d_inode(dentry);
4634 int err;
4635
4636 if (inode) {
4637 if (inode->i_nlink == 1)
4638 nfs4_inode_return_delegation(inode);
4639 else
4640 nfs4_inode_make_writeable(inode);
4641 }
4642 do {
4643 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4644 trace_nfs4_remove(dir, &dentry->d_name, err);
4645 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4646 &exception);
4647 } while (exception.retry);
4648 return err;
4649 }
4650
nfs4_proc_rmdir(struct inode * dir,const struct qstr * name)4651 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4652 {
4653 struct nfs4_exception exception = {
4654 .interruptible = true,
4655 };
4656 int err;
4657
4658 do {
4659 err = _nfs4_proc_remove(dir, name, NF4DIR);
4660 trace_nfs4_remove(dir, name, err);
4661 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4662 &exception);
4663 } while (exception.retry);
4664 return err;
4665 }
4666
nfs4_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)4667 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4668 struct dentry *dentry,
4669 struct inode *inode)
4670 {
4671 struct nfs_removeargs *args = msg->rpc_argp;
4672 struct nfs_removeres *res = msg->rpc_resp;
4673
4674 res->server = NFS_SB(dentry->d_sb);
4675 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4676 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4677
4678 nfs_fattr_init(res->dir_attr);
4679
4680 if (inode)
4681 nfs4_inode_return_delegation(inode);
4682 }
4683
nfs4_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)4684 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4685 {
4686 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4687 &data->args.seq_args,
4688 &data->res.seq_res,
4689 task);
4690 }
4691
nfs4_proc_unlink_done(struct rpc_task * task,struct inode * dir)4692 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4693 {
4694 struct nfs_unlinkdata *data = task->tk_calldata;
4695 struct nfs_removeres *res = &data->res;
4696
4697 if (!nfs4_sequence_done(task, &res->seq_res))
4698 return 0;
4699 if (nfs4_async_handle_error(task, res->server, NULL,
4700 &data->timeout) == -EAGAIN)
4701 return 0;
4702 if (task->tk_status == 0)
4703 nfs4_update_changeattr(dir, &res->cinfo,
4704 res->dir_attr->time_start,
4705 NFS_INO_INVALID_DATA);
4706 return 1;
4707 }
4708
nfs4_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)4709 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4710 struct dentry *old_dentry,
4711 struct dentry *new_dentry)
4712 {
4713 struct nfs_renameargs *arg = msg->rpc_argp;
4714 struct nfs_renameres *res = msg->rpc_resp;
4715 struct inode *old_inode = d_inode(old_dentry);
4716 struct inode *new_inode = d_inode(new_dentry);
4717
4718 if (old_inode)
4719 nfs4_inode_make_writeable(old_inode);
4720 if (new_inode)
4721 nfs4_inode_return_delegation(new_inode);
4722 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4723 res->server = NFS_SB(old_dentry->d_sb);
4724 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4725 }
4726
nfs4_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)4727 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4728 {
4729 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4730 &data->args.seq_args,
4731 &data->res.seq_res,
4732 task);
4733 }
4734
nfs4_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)4735 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4736 struct inode *new_dir)
4737 {
4738 struct nfs_renamedata *data = task->tk_calldata;
4739 struct nfs_renameres *res = &data->res;
4740
4741 if (!nfs4_sequence_done(task, &res->seq_res))
4742 return 0;
4743 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4744 return 0;
4745
4746 if (task->tk_status == 0) {
4747 if (new_dir != old_dir) {
4748 /* Note: If we moved a directory, nlink will change */
4749 nfs4_update_changeattr(old_dir, &res->old_cinfo,
4750 res->old_fattr->time_start,
4751 NFS_INO_INVALID_NLINK |
4752 NFS_INO_INVALID_DATA);
4753 nfs4_update_changeattr(new_dir, &res->new_cinfo,
4754 res->new_fattr->time_start,
4755 NFS_INO_INVALID_NLINK |
4756 NFS_INO_INVALID_DATA);
4757 } else
4758 nfs4_update_changeattr(old_dir, &res->old_cinfo,
4759 res->old_fattr->time_start,
4760 NFS_INO_INVALID_DATA);
4761 }
4762 return 1;
4763 }
4764
_nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)4765 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4766 {
4767 struct nfs_server *server = NFS_SERVER(inode);
4768 __u32 bitmask[NFS4_BITMASK_SZ];
4769 struct nfs4_link_arg arg = {
4770 .fh = NFS_FH(inode),
4771 .dir_fh = NFS_FH(dir),
4772 .name = name,
4773 .bitmask = bitmask,
4774 };
4775 struct nfs4_link_res res = {
4776 .server = server,
4777 .label = NULL,
4778 };
4779 struct rpc_message msg = {
4780 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4781 .rpc_argp = &arg,
4782 .rpc_resp = &res,
4783 };
4784 int status = -ENOMEM;
4785
4786 res.fattr = nfs_alloc_fattr();
4787 if (res.fattr == NULL)
4788 goto out;
4789
4790 res.label = nfs4_label_alloc(server, GFP_KERNEL);
4791 if (IS_ERR(res.label)) {
4792 status = PTR_ERR(res.label);
4793 goto out;
4794 }
4795
4796 nfs4_inode_make_writeable(inode);
4797 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.label), inode,
4798 NFS_INO_INVALID_CHANGE);
4799 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4800 if (!status) {
4801 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4802 NFS_INO_INVALID_DATA);
4803 nfs4_inc_nlink(inode);
4804 status = nfs_post_op_update_inode(inode, res.fattr);
4805 if (!status)
4806 nfs_setsecurity(inode, res.fattr, res.label);
4807 }
4808
4809
4810 nfs4_label_free(res.label);
4811
4812 out:
4813 nfs_free_fattr(res.fattr);
4814 return status;
4815 }
4816
nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)4817 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4818 {
4819 struct nfs4_exception exception = {
4820 .interruptible = true,
4821 };
4822 int err;
4823 do {
4824 err = nfs4_handle_exception(NFS_SERVER(inode),
4825 _nfs4_proc_link(inode, dir, name),
4826 &exception);
4827 } while (exception.retry);
4828 return err;
4829 }
4830
4831 struct nfs4_createdata {
4832 struct rpc_message msg;
4833 struct nfs4_create_arg arg;
4834 struct nfs4_create_res res;
4835 struct nfs_fh fh;
4836 struct nfs_fattr fattr;
4837 struct nfs4_label *label;
4838 };
4839
nfs4_alloc_createdata(struct inode * dir,const struct qstr * name,struct iattr * sattr,u32 ftype)4840 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4841 const struct qstr *name, struct iattr *sattr, u32 ftype)
4842 {
4843 struct nfs4_createdata *data;
4844
4845 data = kzalloc(sizeof(*data), GFP_KERNEL);
4846 if (data != NULL) {
4847 struct nfs_server *server = NFS_SERVER(dir);
4848
4849 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4850 if (IS_ERR(data->label))
4851 goto out_free;
4852
4853 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4854 data->msg.rpc_argp = &data->arg;
4855 data->msg.rpc_resp = &data->res;
4856 data->arg.dir_fh = NFS_FH(dir);
4857 data->arg.server = server;
4858 data->arg.name = name;
4859 data->arg.attrs = sattr;
4860 data->arg.ftype = ftype;
4861 data->arg.bitmask = nfs4_bitmask(server, data->label);
4862 data->arg.umask = current_umask();
4863 data->res.server = server;
4864 data->res.fh = &data->fh;
4865 data->res.fattr = &data->fattr;
4866 data->res.label = data->label;
4867 nfs_fattr_init(data->res.fattr);
4868 }
4869 return data;
4870 out_free:
4871 kfree(data);
4872 return NULL;
4873 }
4874
nfs4_do_create(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data)4875 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4876 {
4877 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4878 &data->arg.seq_args, &data->res.seq_res, 1);
4879 if (status == 0) {
4880 spin_lock(&dir->i_lock);
4881 /* Creating a directory bumps nlink in the parent */
4882 if (data->arg.ftype == NF4DIR)
4883 nfs4_inc_nlink_locked(dir);
4884 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4885 data->res.fattr->time_start,
4886 NFS_INO_INVALID_DATA);
4887 spin_unlock(&dir->i_lock);
4888 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4889 }
4890 return status;
4891 }
4892
nfs4_free_createdata(struct nfs4_createdata * data)4893 static void nfs4_free_createdata(struct nfs4_createdata *data)
4894 {
4895 nfs4_label_free(data->label);
4896 kfree(data);
4897 }
4898
_nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct page * page,unsigned int len,struct iattr * sattr,struct nfs4_label * label)4899 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4900 struct page *page, unsigned int len, struct iattr *sattr,
4901 struct nfs4_label *label)
4902 {
4903 struct nfs4_createdata *data;
4904 int status = -ENAMETOOLONG;
4905
4906 if (len > NFS4_MAXPATHLEN)
4907 goto out;
4908
4909 status = -ENOMEM;
4910 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4911 if (data == NULL)
4912 goto out;
4913
4914 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4915 data->arg.u.symlink.pages = &page;
4916 data->arg.u.symlink.len = len;
4917 data->arg.label = label;
4918
4919 status = nfs4_do_create(dir, dentry, data);
4920
4921 nfs4_free_createdata(data);
4922 out:
4923 return status;
4924 }
4925
nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct page * page,unsigned int len,struct iattr * sattr)4926 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4927 struct page *page, unsigned int len, struct iattr *sattr)
4928 {
4929 struct nfs4_exception exception = {
4930 .interruptible = true,
4931 };
4932 struct nfs4_label l, *label = NULL;
4933 int err;
4934
4935 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4936
4937 do {
4938 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4939 trace_nfs4_symlink(dir, &dentry->d_name, err);
4940 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4941 &exception);
4942 } while (exception.retry);
4943
4944 nfs4_label_release_security(label);
4945 return err;
4946 }
4947
_nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)4948 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4949 struct iattr *sattr, struct nfs4_label *label)
4950 {
4951 struct nfs4_createdata *data;
4952 int status = -ENOMEM;
4953
4954 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4955 if (data == NULL)
4956 goto out;
4957
4958 data->arg.label = label;
4959 status = nfs4_do_create(dir, dentry, data);
4960
4961 nfs4_free_createdata(data);
4962 out:
4963 return status;
4964 }
4965
nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)4966 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4967 struct iattr *sattr)
4968 {
4969 struct nfs_server *server = NFS_SERVER(dir);
4970 struct nfs4_exception exception = {
4971 .interruptible = true,
4972 };
4973 struct nfs4_label l, *label = NULL;
4974 int err;
4975
4976 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4977
4978 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4979 sattr->ia_mode &= ~current_umask();
4980 do {
4981 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4982 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4983 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4984 &exception);
4985 } while (exception.retry);
4986 nfs4_label_release_security(label);
4987
4988 return err;
4989 }
4990
_nfs4_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)4991 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
4992 struct nfs_readdir_res *nr_res)
4993 {
4994 struct inode *dir = d_inode(nr_arg->dentry);
4995 struct nfs_server *server = NFS_SERVER(dir);
4996 struct nfs4_readdir_arg args = {
4997 .fh = NFS_FH(dir),
4998 .pages = nr_arg->pages,
4999 .pgbase = 0,
5000 .count = nr_arg->page_len,
5001 .plus = nr_arg->plus,
5002 };
5003 struct nfs4_readdir_res res;
5004 struct rpc_message msg = {
5005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5006 .rpc_argp = &args,
5007 .rpc_resp = &res,
5008 .rpc_cred = nr_arg->cred,
5009 };
5010 int status;
5011
5012 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5013 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5014 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5015 args.bitmask = server->attr_bitmask_nl;
5016 else
5017 args.bitmask = server->attr_bitmask;
5018
5019 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5020 res.pgbase = args.pgbase;
5021 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5022 &res.seq_res, 0);
5023 if (status >= 0) {
5024 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5025 status += args.pgbase;
5026 }
5027
5028 nfs_invalidate_atime(dir);
5029
5030 dprintk("%s: returns %d\n", __func__, status);
5031 return status;
5032 }
5033
nfs4_proc_readdir(struct nfs_readdir_arg * arg,struct nfs_readdir_res * res)5034 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5035 struct nfs_readdir_res *res)
5036 {
5037 struct nfs4_exception exception = {
5038 .interruptible = true,
5039 };
5040 int err;
5041 do {
5042 err = _nfs4_proc_readdir(arg, res);
5043 trace_nfs4_readdir(d_inode(arg->dentry), err);
5044 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5045 err, &exception);
5046 } while (exception.retry);
5047 return err;
5048 }
5049
_nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,dev_t rdev)5050 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5051 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5052 {
5053 struct nfs4_createdata *data;
5054 int mode = sattr->ia_mode;
5055 int status = -ENOMEM;
5056
5057 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5058 if (data == NULL)
5059 goto out;
5060
5061 if (S_ISFIFO(mode))
5062 data->arg.ftype = NF4FIFO;
5063 else if (S_ISBLK(mode)) {
5064 data->arg.ftype = NF4BLK;
5065 data->arg.u.device.specdata1 = MAJOR(rdev);
5066 data->arg.u.device.specdata2 = MINOR(rdev);
5067 }
5068 else if (S_ISCHR(mode)) {
5069 data->arg.ftype = NF4CHR;
5070 data->arg.u.device.specdata1 = MAJOR(rdev);
5071 data->arg.u.device.specdata2 = MINOR(rdev);
5072 } else if (!S_ISSOCK(mode)) {
5073 status = -EINVAL;
5074 goto out_free;
5075 }
5076
5077 data->arg.label = label;
5078 status = nfs4_do_create(dir, dentry, data);
5079 out_free:
5080 nfs4_free_createdata(data);
5081 out:
5082 return status;
5083 }
5084
nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)5085 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5086 struct iattr *sattr, dev_t rdev)
5087 {
5088 struct nfs_server *server = NFS_SERVER(dir);
5089 struct nfs4_exception exception = {
5090 .interruptible = true,
5091 };
5092 struct nfs4_label l, *label = NULL;
5093 int err;
5094
5095 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5096
5097 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5098 sattr->ia_mode &= ~current_umask();
5099 do {
5100 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5101 trace_nfs4_mknod(dir, &dentry->d_name, err);
5102 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5103 &exception);
5104 } while (exception.retry);
5105
5106 nfs4_label_release_security(label);
5107
5108 return err;
5109 }
5110
_nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5111 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5112 struct nfs_fsstat *fsstat)
5113 {
5114 struct nfs4_statfs_arg args = {
5115 .fh = fhandle,
5116 .bitmask = server->attr_bitmask,
5117 };
5118 struct nfs4_statfs_res res = {
5119 .fsstat = fsstat,
5120 };
5121 struct rpc_message msg = {
5122 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5123 .rpc_argp = &args,
5124 .rpc_resp = &res,
5125 };
5126
5127 nfs_fattr_init(fsstat->fattr);
5128 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5129 }
5130
nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5131 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5132 {
5133 struct nfs4_exception exception = {
5134 .interruptible = true,
5135 };
5136 int err;
5137 do {
5138 err = nfs4_handle_exception(server,
5139 _nfs4_proc_statfs(server, fhandle, fsstat),
5140 &exception);
5141 } while (exception.retry);
5142 return err;
5143 }
5144
_nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5145 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5146 struct nfs_fsinfo *fsinfo)
5147 {
5148 struct nfs4_fsinfo_arg args = {
5149 .fh = fhandle,
5150 .bitmask = server->attr_bitmask,
5151 };
5152 struct nfs4_fsinfo_res res = {
5153 .fsinfo = fsinfo,
5154 };
5155 struct rpc_message msg = {
5156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5157 .rpc_argp = &args,
5158 .rpc_resp = &res,
5159 };
5160
5161 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5162 }
5163
nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5164 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5165 {
5166 struct nfs4_exception exception = {
5167 .interruptible = true,
5168 };
5169 int err;
5170
5171 do {
5172 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5173 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5174 if (err == 0) {
5175 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5176 break;
5177 }
5178 err = nfs4_handle_exception(server, err, &exception);
5179 } while (exception.retry);
5180 return err;
5181 }
5182
nfs4_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5183 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5184 {
5185 int error;
5186
5187 nfs_fattr_init(fsinfo->fattr);
5188 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5189 if (error == 0) {
5190 /* block layout checks this! */
5191 server->pnfs_blksize = fsinfo->blksize;
5192 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5193 }
5194
5195 return error;
5196 }
5197
_nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5198 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5199 struct nfs_pathconf *pathconf)
5200 {
5201 struct nfs4_pathconf_arg args = {
5202 .fh = fhandle,
5203 .bitmask = server->attr_bitmask,
5204 };
5205 struct nfs4_pathconf_res res = {
5206 .pathconf = pathconf,
5207 };
5208 struct rpc_message msg = {
5209 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5210 .rpc_argp = &args,
5211 .rpc_resp = &res,
5212 };
5213
5214 /* None of the pathconf attributes are mandatory to implement */
5215 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5216 memset(pathconf, 0, sizeof(*pathconf));
5217 return 0;
5218 }
5219
5220 nfs_fattr_init(pathconf->fattr);
5221 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5222 }
5223
nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5224 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5225 struct nfs_pathconf *pathconf)
5226 {
5227 struct nfs4_exception exception = {
5228 .interruptible = true,
5229 };
5230 int err;
5231
5232 do {
5233 err = nfs4_handle_exception(server,
5234 _nfs4_proc_pathconf(server, fhandle, pathconf),
5235 &exception);
5236 } while (exception.retry);
5237 return err;
5238 }
5239
nfs4_set_rw_stateid(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5240 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5241 const struct nfs_open_context *ctx,
5242 const struct nfs_lock_context *l_ctx,
5243 fmode_t fmode)
5244 {
5245 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5246 }
5247 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5248
nfs4_stateid_is_current(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5249 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5250 const struct nfs_open_context *ctx,
5251 const struct nfs_lock_context *l_ctx,
5252 fmode_t fmode)
5253 {
5254 nfs4_stateid _current_stateid;
5255
5256 /* If the current stateid represents a lost lock, then exit */
5257 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5258 return true;
5259 return nfs4_stateid_match(stateid, &_current_stateid);
5260 }
5261
nfs4_error_stateid_expired(int err)5262 static bool nfs4_error_stateid_expired(int err)
5263 {
5264 switch (err) {
5265 case -NFS4ERR_DELEG_REVOKED:
5266 case -NFS4ERR_ADMIN_REVOKED:
5267 case -NFS4ERR_BAD_STATEID:
5268 case -NFS4ERR_STALE_STATEID:
5269 case -NFS4ERR_OLD_STATEID:
5270 case -NFS4ERR_OPENMODE:
5271 case -NFS4ERR_EXPIRED:
5272 return true;
5273 }
5274 return false;
5275 }
5276
nfs4_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5277 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5278 {
5279 struct nfs_server *server = NFS_SERVER(hdr->inode);
5280
5281 trace_nfs4_read(hdr, task->tk_status);
5282 if (task->tk_status < 0) {
5283 struct nfs4_exception exception = {
5284 .inode = hdr->inode,
5285 .state = hdr->args.context->state,
5286 .stateid = &hdr->args.stateid,
5287 };
5288 task->tk_status = nfs4_async_handle_exception(task,
5289 server, task->tk_status, &exception);
5290 if (exception.retry) {
5291 rpc_restart_call_prepare(task);
5292 return -EAGAIN;
5293 }
5294 }
5295
5296 if (task->tk_status > 0)
5297 renew_lease(server, hdr->timestamp);
5298 return 0;
5299 }
5300
nfs4_read_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5301 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5302 struct nfs_pgio_args *args)
5303 {
5304
5305 if (!nfs4_error_stateid_expired(task->tk_status) ||
5306 nfs4_stateid_is_current(&args->stateid,
5307 args->context,
5308 args->lock_context,
5309 FMODE_READ))
5310 return false;
5311 rpc_restart_call_prepare(task);
5312 return true;
5313 }
5314
nfs4_read_plus_not_supported(struct rpc_task * task,struct nfs_pgio_header * hdr)5315 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5316 struct nfs_pgio_header *hdr)
5317 {
5318 struct nfs_server *server = NFS_SERVER(hdr->inode);
5319 struct rpc_message *msg = &task->tk_msg;
5320
5321 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5322 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5323 server->caps &= ~NFS_CAP_READ_PLUS;
5324 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5325 rpc_restart_call_prepare(task);
5326 return true;
5327 }
5328 return false;
5329 }
5330
nfs4_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5331 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5332 {
5333 dprintk("--> %s\n", __func__);
5334
5335 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5336 return -EAGAIN;
5337 if (nfs4_read_stateid_changed(task, &hdr->args))
5338 return -EAGAIN;
5339 if (nfs4_read_plus_not_supported(task, hdr))
5340 return -EAGAIN;
5341 if (task->tk_status > 0)
5342 nfs_invalidate_atime(hdr->inode);
5343 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5344 nfs4_read_done_cb(task, hdr);
5345 }
5346
5347 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5348 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5349 struct rpc_message *msg)
5350 {
5351 /* Note: We don't use READ_PLUS with pNFS yet */
5352 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp)
5353 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5354 }
5355 #else
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5356 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5357 struct rpc_message *msg)
5358 {
5359 }
5360 #endif /* CONFIG_NFS_V4_2 */
5361
nfs4_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)5362 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5363 struct rpc_message *msg)
5364 {
5365 hdr->timestamp = jiffies;
5366 if (!hdr->pgio_done_cb)
5367 hdr->pgio_done_cb = nfs4_read_done_cb;
5368 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5369 nfs42_read_plus_support(hdr, msg);
5370 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5371 }
5372
nfs4_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)5373 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5374 struct nfs_pgio_header *hdr)
5375 {
5376 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5377 &hdr->args.seq_args,
5378 &hdr->res.seq_res,
5379 task))
5380 return 0;
5381 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5382 hdr->args.lock_context,
5383 hdr->rw_mode) == -EIO)
5384 return -EIO;
5385 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5386 return -EIO;
5387 return 0;
5388 }
5389
nfs4_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5390 static int nfs4_write_done_cb(struct rpc_task *task,
5391 struct nfs_pgio_header *hdr)
5392 {
5393 struct inode *inode = hdr->inode;
5394
5395 trace_nfs4_write(hdr, task->tk_status);
5396 if (task->tk_status < 0) {
5397 struct nfs4_exception exception = {
5398 .inode = hdr->inode,
5399 .state = hdr->args.context->state,
5400 .stateid = &hdr->args.stateid,
5401 };
5402 task->tk_status = nfs4_async_handle_exception(task,
5403 NFS_SERVER(inode), task->tk_status,
5404 &exception);
5405 if (exception.retry) {
5406 rpc_restart_call_prepare(task);
5407 return -EAGAIN;
5408 }
5409 }
5410 if (task->tk_status >= 0) {
5411 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5412 nfs_writeback_update_inode(hdr);
5413 }
5414 return 0;
5415 }
5416
nfs4_write_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5417 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5418 struct nfs_pgio_args *args)
5419 {
5420
5421 if (!nfs4_error_stateid_expired(task->tk_status) ||
5422 nfs4_stateid_is_current(&args->stateid,
5423 args->context,
5424 args->lock_context,
5425 FMODE_WRITE))
5426 return false;
5427 rpc_restart_call_prepare(task);
5428 return true;
5429 }
5430
nfs4_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5431 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5432 {
5433 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5434 return -EAGAIN;
5435 if (nfs4_write_stateid_changed(task, &hdr->args))
5436 return -EAGAIN;
5437 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5438 nfs4_write_done_cb(task, hdr);
5439 }
5440
5441 static
nfs4_write_need_cache_consistency_data(struct nfs_pgio_header * hdr)5442 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5443 {
5444 /* Don't request attributes for pNFS or O_DIRECT writes */
5445 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5446 return false;
5447 /* Otherwise, request attributes if and only if we don't hold
5448 * a delegation
5449 */
5450 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5451 }
5452
nfs4_bitmask_set(__u32 bitmask[NFS4_BITMASK_SZ],const __u32 * src,struct inode * inode,struct nfs_server * server,struct nfs4_label * label)5453 static void nfs4_bitmask_set(__u32 bitmask[NFS4_BITMASK_SZ], const __u32 *src,
5454 struct inode *inode, struct nfs_server *server,
5455 struct nfs4_label *label)
5456 {
5457 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
5458 unsigned int i;
5459
5460 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5461
5462 if (cache_validity & NFS_INO_INVALID_CHANGE)
5463 bitmask[0] |= FATTR4_WORD0_CHANGE;
5464 if (cache_validity & NFS_INO_INVALID_ATIME)
5465 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5466 if (cache_validity & NFS_INO_INVALID_MODE)
5467 bitmask[1] |= FATTR4_WORD1_MODE;
5468 if (cache_validity & NFS_INO_INVALID_OTHER)
5469 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5470 if (cache_validity & NFS_INO_INVALID_NLINK)
5471 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5472 if (label && label->len && cache_validity & NFS_INO_INVALID_LABEL)
5473 bitmask[2] |= FATTR4_WORD2_SECURITY_LABEL;
5474 if (cache_validity & NFS_INO_INVALID_CTIME)
5475 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5476 if (cache_validity & NFS_INO_INVALID_MTIME)
5477 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5478 if (cache_validity & NFS_INO_INVALID_BLOCKS)
5479 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5480
5481 if (cache_validity & NFS_INO_INVALID_SIZE)
5482 bitmask[0] |= FATTR4_WORD0_SIZE;
5483
5484 for (i = 0; i < NFS4_BITMASK_SZ; i++)
5485 bitmask[i] &= server->attr_bitmask[i];
5486 }
5487
nfs4_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)5488 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5489 struct rpc_message *msg,
5490 struct rpc_clnt **clnt)
5491 {
5492 struct nfs_server *server = NFS_SERVER(hdr->inode);
5493
5494 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5495 hdr->args.bitmask = NULL;
5496 hdr->res.fattr = NULL;
5497 } else {
5498 nfs4_bitmask_set(hdr->args.bitmask_store,
5499 server->cache_consistency_bitmask,
5500 hdr->inode, server, NULL);
5501 hdr->args.bitmask = hdr->args.bitmask_store;
5502 }
5503
5504 if (!hdr->pgio_done_cb)
5505 hdr->pgio_done_cb = nfs4_write_done_cb;
5506 hdr->res.server = server;
5507 hdr->timestamp = jiffies;
5508
5509 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5510 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5511 nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5512 }
5513
nfs4_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)5514 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5515 {
5516 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5517 &data->args.seq_args,
5518 &data->res.seq_res,
5519 task);
5520 }
5521
nfs4_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)5522 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5523 {
5524 struct inode *inode = data->inode;
5525
5526 trace_nfs4_commit(data, task->tk_status);
5527 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5528 NULL, NULL) == -EAGAIN) {
5529 rpc_restart_call_prepare(task);
5530 return -EAGAIN;
5531 }
5532 return 0;
5533 }
5534
nfs4_commit_done(struct rpc_task * task,struct nfs_commit_data * data)5535 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5536 {
5537 if (!nfs4_sequence_done(task, &data->res.seq_res))
5538 return -EAGAIN;
5539 return data->commit_done_cb(task, data);
5540 }
5541
nfs4_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)5542 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5543 struct rpc_clnt **clnt)
5544 {
5545 struct nfs_server *server = NFS_SERVER(data->inode);
5546
5547 if (data->commit_done_cb == NULL)
5548 data->commit_done_cb = nfs4_commit_done_cb;
5549 data->res.server = server;
5550 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5551 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5552 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5553 }
5554
_nfs4_proc_commit(struct file * dst,struct nfs_commitargs * args,struct nfs_commitres * res)5555 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5556 struct nfs_commitres *res)
5557 {
5558 struct inode *dst_inode = file_inode(dst);
5559 struct nfs_server *server = NFS_SERVER(dst_inode);
5560 struct rpc_message msg = {
5561 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5562 .rpc_argp = args,
5563 .rpc_resp = res,
5564 };
5565
5566 args->fh = NFS_FH(dst_inode);
5567 return nfs4_call_sync(server->client, server, &msg,
5568 &args->seq_args, &res->seq_res, 1);
5569 }
5570
nfs4_proc_commit(struct file * dst,__u64 offset,__u32 count,struct nfs_commitres * res)5571 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5572 {
5573 struct nfs_commitargs args = {
5574 .offset = offset,
5575 .count = count,
5576 };
5577 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5578 struct nfs4_exception exception = { };
5579 int status;
5580
5581 do {
5582 status = _nfs4_proc_commit(dst, &args, res);
5583 status = nfs4_handle_exception(dst_server, status, &exception);
5584 } while (exception.retry);
5585
5586 return status;
5587 }
5588
5589 struct nfs4_renewdata {
5590 struct nfs_client *client;
5591 unsigned long timestamp;
5592 };
5593
5594 /*
5595 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5596 * standalone procedure for queueing an asynchronous RENEW.
5597 */
nfs4_renew_release(void * calldata)5598 static void nfs4_renew_release(void *calldata)
5599 {
5600 struct nfs4_renewdata *data = calldata;
5601 struct nfs_client *clp = data->client;
5602
5603 if (refcount_read(&clp->cl_count) > 1)
5604 nfs4_schedule_state_renewal(clp);
5605 nfs_put_client(clp);
5606 kfree(data);
5607 }
5608
nfs4_renew_done(struct rpc_task * task,void * calldata)5609 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5610 {
5611 struct nfs4_renewdata *data = calldata;
5612 struct nfs_client *clp = data->client;
5613 unsigned long timestamp = data->timestamp;
5614
5615 trace_nfs4_renew_async(clp, task->tk_status);
5616 switch (task->tk_status) {
5617 case 0:
5618 break;
5619 case -NFS4ERR_LEASE_MOVED:
5620 nfs4_schedule_lease_moved_recovery(clp);
5621 break;
5622 default:
5623 /* Unless we're shutting down, schedule state recovery! */
5624 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5625 return;
5626 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5627 nfs4_schedule_lease_recovery(clp);
5628 return;
5629 }
5630 nfs4_schedule_path_down_recovery(clp);
5631 }
5632 do_renew_lease(clp, timestamp);
5633 }
5634
5635 static const struct rpc_call_ops nfs4_renew_ops = {
5636 .rpc_call_done = nfs4_renew_done,
5637 .rpc_release = nfs4_renew_release,
5638 };
5639
nfs4_proc_async_renew(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)5640 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5641 {
5642 struct rpc_message msg = {
5643 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5644 .rpc_argp = clp,
5645 .rpc_cred = cred,
5646 };
5647 struct nfs4_renewdata *data;
5648
5649 if (renew_flags == 0)
5650 return 0;
5651 if (!refcount_inc_not_zero(&clp->cl_count))
5652 return -EIO;
5653 data = kmalloc(sizeof(*data), GFP_NOFS);
5654 if (data == NULL) {
5655 nfs_put_client(clp);
5656 return -ENOMEM;
5657 }
5658 data->client = clp;
5659 data->timestamp = jiffies;
5660 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5661 &nfs4_renew_ops, data);
5662 }
5663
nfs4_proc_renew(struct nfs_client * clp,const struct cred * cred)5664 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5665 {
5666 struct rpc_message msg = {
5667 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5668 .rpc_argp = clp,
5669 .rpc_cred = cred,
5670 };
5671 unsigned long now = jiffies;
5672 int status;
5673
5674 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5675 if (status < 0)
5676 return status;
5677 do_renew_lease(clp, now);
5678 return 0;
5679 }
5680
nfs4_server_supports_acls(struct nfs_server * server)5681 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5682 {
5683 return server->caps & NFS_CAP_ACLS;
5684 }
5685
5686 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5687 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5688 * the stack.
5689 */
5690 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5691
nfs4_buf_to_pages_noslab(const void * buf,size_t buflen,struct page ** pages)5692 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5693 struct page **pages)
5694 {
5695 struct page *newpage, **spages;
5696 int rc = 0;
5697 size_t len;
5698 spages = pages;
5699
5700 do {
5701 len = min_t(size_t, PAGE_SIZE, buflen);
5702 newpage = alloc_page(GFP_KERNEL);
5703
5704 if (newpage == NULL)
5705 goto unwind;
5706 memcpy(page_address(newpage), buf, len);
5707 buf += len;
5708 buflen -= len;
5709 *pages++ = newpage;
5710 rc++;
5711 } while (buflen != 0);
5712
5713 return rc;
5714
5715 unwind:
5716 for(; rc > 0; rc--)
5717 __free_page(spages[rc-1]);
5718 return -ENOMEM;
5719 }
5720
5721 struct nfs4_cached_acl {
5722 int cached;
5723 size_t len;
5724 char data[];
5725 };
5726
nfs4_set_cached_acl(struct inode * inode,struct nfs4_cached_acl * acl)5727 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5728 {
5729 struct nfs_inode *nfsi = NFS_I(inode);
5730
5731 spin_lock(&inode->i_lock);
5732 kfree(nfsi->nfs4_acl);
5733 nfsi->nfs4_acl = acl;
5734 spin_unlock(&inode->i_lock);
5735 }
5736
nfs4_zap_acl_attr(struct inode * inode)5737 static void nfs4_zap_acl_attr(struct inode *inode)
5738 {
5739 nfs4_set_cached_acl(inode, NULL);
5740 }
5741
nfs4_read_cached_acl(struct inode * inode,char * buf,size_t buflen)5742 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5743 {
5744 struct nfs_inode *nfsi = NFS_I(inode);
5745 struct nfs4_cached_acl *acl;
5746 int ret = -ENOENT;
5747
5748 spin_lock(&inode->i_lock);
5749 acl = nfsi->nfs4_acl;
5750 if (acl == NULL)
5751 goto out;
5752 if (buf == NULL) /* user is just asking for length */
5753 goto out_len;
5754 if (acl->cached == 0)
5755 goto out;
5756 ret = -ERANGE; /* see getxattr(2) man page */
5757 if (acl->len > buflen)
5758 goto out;
5759 memcpy(buf, acl->data, acl->len);
5760 out_len:
5761 ret = acl->len;
5762 out:
5763 spin_unlock(&inode->i_lock);
5764 return ret;
5765 }
5766
nfs4_write_cached_acl(struct inode * inode,struct page ** pages,size_t pgbase,size_t acl_len)5767 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5768 {
5769 struct nfs4_cached_acl *acl;
5770 size_t buflen = sizeof(*acl) + acl_len;
5771
5772 if (buflen <= PAGE_SIZE) {
5773 acl = kmalloc(buflen, GFP_KERNEL);
5774 if (acl == NULL)
5775 goto out;
5776 acl->cached = 1;
5777 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5778 } else {
5779 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5780 if (acl == NULL)
5781 goto out;
5782 acl->cached = 0;
5783 }
5784 acl->len = acl_len;
5785 out:
5786 nfs4_set_cached_acl(inode, acl);
5787 }
5788
5789 /*
5790 * The getxattr API returns the required buffer length when called with a
5791 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5792 * the required buf. On a NULL buf, we send a page of data to the server
5793 * guessing that the ACL request can be serviced by a page. If so, we cache
5794 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5795 * the cache. If not so, we throw away the page, and cache the required
5796 * length. The next getxattr call will then produce another round trip to
5797 * the server, this time with the input buf of the required size.
5798 */
__nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen)5799 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5800 {
5801 struct page **pages;
5802 struct nfs_getaclargs args = {
5803 .fh = NFS_FH(inode),
5804 .acl_len = buflen,
5805 };
5806 struct nfs_getaclres res = {
5807 .acl_len = buflen,
5808 };
5809 struct rpc_message msg = {
5810 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5811 .rpc_argp = &args,
5812 .rpc_resp = &res,
5813 };
5814 unsigned int npages;
5815 int ret = -ENOMEM, i;
5816 struct nfs_server *server = NFS_SERVER(inode);
5817
5818 if (buflen == 0)
5819 buflen = server->rsize;
5820
5821 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5822 pages = kmalloc_array(npages, sizeof(struct page *), GFP_NOFS);
5823 if (!pages)
5824 return -ENOMEM;
5825
5826 args.acl_pages = pages;
5827
5828 for (i = 0; i < npages; i++) {
5829 pages[i] = alloc_page(GFP_KERNEL);
5830 if (!pages[i])
5831 goto out_free;
5832 }
5833
5834 /* for decoding across pages */
5835 res.acl_scratch = alloc_page(GFP_KERNEL);
5836 if (!res.acl_scratch)
5837 goto out_free;
5838
5839 args.acl_len = npages * PAGE_SIZE;
5840
5841 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
5842 __func__, buf, buflen, npages, args.acl_len);
5843 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5844 &msg, &args.seq_args, &res.seq_res, 0);
5845 if (ret)
5846 goto out_free;
5847
5848 /* Handle the case where the passed-in buffer is too short */
5849 if (res.acl_flags & NFS4_ACL_TRUNC) {
5850 /* Did the user only issue a request for the acl length? */
5851 if (buf == NULL)
5852 goto out_ok;
5853 ret = -ERANGE;
5854 goto out_free;
5855 }
5856 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5857 if (buf) {
5858 if (res.acl_len > buflen) {
5859 ret = -ERANGE;
5860 goto out_free;
5861 }
5862 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5863 }
5864 out_ok:
5865 ret = res.acl_len;
5866 out_free:
5867 for (i = 0; i < npages; i++)
5868 if (pages[i])
5869 __free_page(pages[i]);
5870 if (res.acl_scratch)
5871 __free_page(res.acl_scratch);
5872 kfree(pages);
5873 return ret;
5874 }
5875
nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen)5876 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5877 {
5878 struct nfs4_exception exception = {
5879 .interruptible = true,
5880 };
5881 ssize_t ret;
5882 do {
5883 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5884 trace_nfs4_get_acl(inode, ret);
5885 if (ret >= 0)
5886 break;
5887 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5888 } while (exception.retry);
5889 return ret;
5890 }
5891
nfs4_proc_get_acl(struct inode * inode,void * buf,size_t buflen)5892 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5893 {
5894 struct nfs_server *server = NFS_SERVER(inode);
5895 int ret;
5896
5897 if (!nfs4_server_supports_acls(server))
5898 return -EOPNOTSUPP;
5899 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
5900 if (ret < 0)
5901 return ret;
5902 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5903 nfs_zap_acl_cache(inode);
5904 ret = nfs4_read_cached_acl(inode, buf, buflen);
5905 if (ret != -ENOENT)
5906 /* -ENOENT is returned if there is no ACL or if there is an ACL
5907 * but no cached acl data, just the acl length */
5908 return ret;
5909 return nfs4_get_acl_uncached(inode, buf, buflen);
5910 }
5911
__nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen)5912 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5913 {
5914 struct nfs_server *server = NFS_SERVER(inode);
5915 struct page *pages[NFS4ACL_MAXPAGES];
5916 struct nfs_setaclargs arg = {
5917 .fh = NFS_FH(inode),
5918 .acl_pages = pages,
5919 .acl_len = buflen,
5920 };
5921 struct nfs_setaclres res;
5922 struct rpc_message msg = {
5923 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5924 .rpc_argp = &arg,
5925 .rpc_resp = &res,
5926 };
5927 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5928 int ret, i;
5929
5930 /* You can't remove system.nfs4_acl: */
5931 if (buflen == 0)
5932 return -EINVAL;
5933 if (!nfs4_server_supports_acls(server))
5934 return -EOPNOTSUPP;
5935 if (npages > ARRAY_SIZE(pages))
5936 return -ERANGE;
5937 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5938 if (i < 0)
5939 return i;
5940 nfs4_inode_make_writeable(inode);
5941 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5942
5943 /*
5944 * Free each page after tx, so the only ref left is
5945 * held by the network stack
5946 */
5947 for (; i > 0; i--)
5948 put_page(pages[i-1]);
5949
5950 /*
5951 * Acl update can result in inode attribute update.
5952 * so mark the attribute cache invalid.
5953 */
5954 spin_lock(&inode->i_lock);
5955 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
5956 NFS_INO_INVALID_CTIME |
5957 NFS_INO_REVAL_FORCED);
5958 spin_unlock(&inode->i_lock);
5959 nfs_access_zap_cache(inode);
5960 nfs_zap_acl_cache(inode);
5961 return ret;
5962 }
5963
nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen)5964 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5965 {
5966 struct nfs4_exception exception = { };
5967 int err;
5968 do {
5969 err = __nfs4_proc_set_acl(inode, buf, buflen);
5970 trace_nfs4_set_acl(inode, err);
5971 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5972 &exception);
5973 } while (exception.retry);
5974 return err;
5975 }
5976
5977 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
_nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)5978 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5979 size_t buflen)
5980 {
5981 struct nfs_server *server = NFS_SERVER(inode);
5982 struct nfs_fattr fattr;
5983 struct nfs4_label label = {0, 0, buflen, buf};
5984
5985 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5986 struct nfs4_getattr_arg arg = {
5987 .fh = NFS_FH(inode),
5988 .bitmask = bitmask,
5989 };
5990 struct nfs4_getattr_res res = {
5991 .fattr = &fattr,
5992 .label = &label,
5993 .server = server,
5994 };
5995 struct rpc_message msg = {
5996 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5997 .rpc_argp = &arg,
5998 .rpc_resp = &res,
5999 };
6000 int ret;
6001
6002 nfs_fattr_init(&fattr);
6003
6004 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6005 if (ret)
6006 return ret;
6007 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6008 return -ENOENT;
6009 return label.len;
6010 }
6011
nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6012 static int nfs4_get_security_label(struct inode *inode, void *buf,
6013 size_t buflen)
6014 {
6015 struct nfs4_exception exception = {
6016 .interruptible = true,
6017 };
6018 int err;
6019
6020 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6021 return -EOPNOTSUPP;
6022
6023 do {
6024 err = _nfs4_get_security_label(inode, buf, buflen);
6025 trace_nfs4_get_security_label(inode, err);
6026 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6027 &exception);
6028 } while (exception.retry);
6029 return err;
6030 }
6031
_nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr,struct nfs4_label * olabel)6032 static int _nfs4_do_set_security_label(struct inode *inode,
6033 struct nfs4_label *ilabel,
6034 struct nfs_fattr *fattr,
6035 struct nfs4_label *olabel)
6036 {
6037
6038 struct iattr sattr = {0};
6039 struct nfs_server *server = NFS_SERVER(inode);
6040 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6041 struct nfs_setattrargs arg = {
6042 .fh = NFS_FH(inode),
6043 .iap = &sattr,
6044 .server = server,
6045 .bitmask = bitmask,
6046 .label = ilabel,
6047 };
6048 struct nfs_setattrres res = {
6049 .fattr = fattr,
6050 .label = olabel,
6051 .server = server,
6052 };
6053 struct rpc_message msg = {
6054 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6055 .rpc_argp = &arg,
6056 .rpc_resp = &res,
6057 };
6058 int status;
6059
6060 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6061
6062 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6063 if (status)
6064 dprintk("%s failed: %d\n", __func__, status);
6065
6066 return status;
6067 }
6068
nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr,struct nfs4_label * olabel)6069 static int nfs4_do_set_security_label(struct inode *inode,
6070 struct nfs4_label *ilabel,
6071 struct nfs_fattr *fattr,
6072 struct nfs4_label *olabel)
6073 {
6074 struct nfs4_exception exception = { };
6075 int err;
6076
6077 do {
6078 err = _nfs4_do_set_security_label(inode, ilabel,
6079 fattr, olabel);
6080 trace_nfs4_set_security_label(inode, err);
6081 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6082 &exception);
6083 } while (exception.retry);
6084 return err;
6085 }
6086
6087 static int
nfs4_set_security_label(struct inode * inode,const void * buf,size_t buflen)6088 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6089 {
6090 struct nfs4_label ilabel, *olabel = NULL;
6091 struct nfs_fattr fattr;
6092 int status;
6093
6094 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6095 return -EOPNOTSUPP;
6096
6097 nfs_fattr_init(&fattr);
6098
6099 ilabel.pi = 0;
6100 ilabel.lfs = 0;
6101 ilabel.label = (char *)buf;
6102 ilabel.len = buflen;
6103
6104 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
6105 if (IS_ERR(olabel)) {
6106 status = -PTR_ERR(olabel);
6107 goto out;
6108 }
6109
6110 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
6111 if (status == 0)
6112 nfs_setsecurity(inode, &fattr, olabel);
6113
6114 nfs4_label_free(olabel);
6115 out:
6116 return status;
6117 }
6118 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
6119
6120
nfs4_init_boot_verifier(const struct nfs_client * clp,nfs4_verifier * bootverf)6121 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6122 nfs4_verifier *bootverf)
6123 {
6124 __be32 verf[2];
6125
6126 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6127 /* An impossible timestamp guarantees this value
6128 * will never match a generated boot time. */
6129 verf[0] = cpu_to_be32(U32_MAX);
6130 verf[1] = cpu_to_be32(U32_MAX);
6131 } else {
6132 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6133 u64 ns = ktime_to_ns(nn->boot_time);
6134
6135 verf[0] = cpu_to_be32(ns >> 32);
6136 verf[1] = cpu_to_be32(ns);
6137 }
6138 memcpy(bootverf->data, verf, sizeof(bootverf->data));
6139 }
6140
6141 static size_t
nfs4_get_uniquifier(struct nfs_client * clp,char * buf,size_t buflen)6142 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6143 {
6144 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6145 struct nfs_netns_client *nn_clp = nn->nfs_client;
6146 const char *id;
6147
6148 buf[0] = '\0';
6149
6150 if (nn_clp) {
6151 rcu_read_lock();
6152 id = rcu_dereference(nn_clp->identifier);
6153 if (id)
6154 strscpy(buf, id, buflen);
6155 rcu_read_unlock();
6156 }
6157
6158 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6159 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6160
6161 return strlen(buf);
6162 }
6163
6164 static int
nfs4_init_nonuniform_client_string(struct nfs_client * clp)6165 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6166 {
6167 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6168 size_t buflen;
6169 size_t len;
6170 char *str;
6171
6172 if (clp->cl_owner_id != NULL)
6173 return 0;
6174
6175 rcu_read_lock();
6176 len = 14 +
6177 strlen(clp->cl_rpcclient->cl_nodename) +
6178 1 +
6179 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6180 1;
6181 rcu_read_unlock();
6182
6183 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6184 if (buflen)
6185 len += buflen + 1;
6186
6187 if (len > NFS4_OPAQUE_LIMIT + 1)
6188 return -EINVAL;
6189
6190 /*
6191 * Since this string is allocated at mount time, and held until the
6192 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6193 * about a memory-reclaim deadlock.
6194 */
6195 str = kmalloc(len, GFP_KERNEL);
6196 if (!str)
6197 return -ENOMEM;
6198
6199 rcu_read_lock();
6200 if (buflen)
6201 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6202 clp->cl_rpcclient->cl_nodename, buf,
6203 rpc_peeraddr2str(clp->cl_rpcclient,
6204 RPC_DISPLAY_ADDR));
6205 else
6206 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6207 clp->cl_rpcclient->cl_nodename,
6208 rpc_peeraddr2str(clp->cl_rpcclient,
6209 RPC_DISPLAY_ADDR));
6210 rcu_read_unlock();
6211
6212 clp->cl_owner_id = str;
6213 return 0;
6214 }
6215
6216 static int
nfs4_init_uniform_client_string(struct nfs_client * clp)6217 nfs4_init_uniform_client_string(struct nfs_client *clp)
6218 {
6219 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6220 size_t buflen;
6221 size_t len;
6222 char *str;
6223
6224 if (clp->cl_owner_id != NULL)
6225 return 0;
6226
6227 len = 10 + 10 + 1 + 10 + 1 +
6228 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6229
6230 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6231 if (buflen)
6232 len += buflen + 1;
6233
6234 if (len > NFS4_OPAQUE_LIMIT + 1)
6235 return -EINVAL;
6236
6237 /*
6238 * Since this string is allocated at mount time, and held until the
6239 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6240 * about a memory-reclaim deadlock.
6241 */
6242 str = kmalloc(len, GFP_KERNEL);
6243 if (!str)
6244 return -ENOMEM;
6245
6246 if (buflen)
6247 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6248 clp->rpc_ops->version, clp->cl_minorversion,
6249 buf, clp->cl_rpcclient->cl_nodename);
6250 else
6251 scnprintf(str, len, "Linux NFSv%u.%u %s",
6252 clp->rpc_ops->version, clp->cl_minorversion,
6253 clp->cl_rpcclient->cl_nodename);
6254 clp->cl_owner_id = str;
6255 return 0;
6256 }
6257
6258 /*
6259 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6260 * services. Advertise one based on the address family of the
6261 * clientaddr.
6262 */
6263 static unsigned int
nfs4_init_callback_netid(const struct nfs_client * clp,char * buf,size_t len)6264 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6265 {
6266 if (strchr(clp->cl_ipaddr, ':') != NULL)
6267 return scnprintf(buf, len, "tcp6");
6268 else
6269 return scnprintf(buf, len, "tcp");
6270 }
6271
nfs4_setclientid_done(struct rpc_task * task,void * calldata)6272 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6273 {
6274 struct nfs4_setclientid *sc = calldata;
6275
6276 if (task->tk_status == 0)
6277 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6278 }
6279
6280 static const struct rpc_call_ops nfs4_setclientid_ops = {
6281 .rpc_call_done = nfs4_setclientid_done,
6282 };
6283
6284 /**
6285 * nfs4_proc_setclientid - Negotiate client ID
6286 * @clp: state data structure
6287 * @program: RPC program for NFSv4 callback service
6288 * @port: IP port number for NFS4 callback service
6289 * @cred: credential to use for this call
6290 * @res: where to place the result
6291 *
6292 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6293 */
nfs4_proc_setclientid(struct nfs_client * clp,u32 program,unsigned short port,const struct cred * cred,struct nfs4_setclientid_res * res)6294 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6295 unsigned short port, const struct cred *cred,
6296 struct nfs4_setclientid_res *res)
6297 {
6298 nfs4_verifier sc_verifier;
6299 struct nfs4_setclientid setclientid = {
6300 .sc_verifier = &sc_verifier,
6301 .sc_prog = program,
6302 .sc_clnt = clp,
6303 };
6304 struct rpc_message msg = {
6305 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6306 .rpc_argp = &setclientid,
6307 .rpc_resp = res,
6308 .rpc_cred = cred,
6309 };
6310 struct rpc_task_setup task_setup_data = {
6311 .rpc_client = clp->cl_rpcclient,
6312 .rpc_message = &msg,
6313 .callback_ops = &nfs4_setclientid_ops,
6314 .callback_data = &setclientid,
6315 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6316 };
6317 unsigned long now = jiffies;
6318 int status;
6319
6320 /* nfs_client_id4 */
6321 nfs4_init_boot_verifier(clp, &sc_verifier);
6322
6323 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6324 status = nfs4_init_uniform_client_string(clp);
6325 else
6326 status = nfs4_init_nonuniform_client_string(clp);
6327
6328 if (status)
6329 goto out;
6330
6331 /* cb_client4 */
6332 setclientid.sc_netid_len =
6333 nfs4_init_callback_netid(clp,
6334 setclientid.sc_netid,
6335 sizeof(setclientid.sc_netid));
6336 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6337 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6338 clp->cl_ipaddr, port >> 8, port & 255);
6339
6340 dprintk("NFS call setclientid auth=%s, '%s'\n",
6341 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6342 clp->cl_owner_id);
6343
6344 status = nfs4_call_sync_custom(&task_setup_data);
6345 if (setclientid.sc_cred) {
6346 kfree(clp->cl_acceptor);
6347 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6348 put_rpccred(setclientid.sc_cred);
6349 }
6350
6351 if (status == 0)
6352 do_renew_lease(clp, now);
6353 out:
6354 trace_nfs4_setclientid(clp, status);
6355 dprintk("NFS reply setclientid: %d\n", status);
6356 return status;
6357 }
6358
6359 /**
6360 * nfs4_proc_setclientid_confirm - Confirm client ID
6361 * @clp: state data structure
6362 * @arg: result of a previous SETCLIENTID
6363 * @cred: credential to use for this call
6364 *
6365 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6366 */
nfs4_proc_setclientid_confirm(struct nfs_client * clp,struct nfs4_setclientid_res * arg,const struct cred * cred)6367 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6368 struct nfs4_setclientid_res *arg,
6369 const struct cred *cred)
6370 {
6371 struct rpc_message msg = {
6372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6373 .rpc_argp = arg,
6374 .rpc_cred = cred,
6375 };
6376 int status;
6377
6378 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
6379 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6380 clp->cl_clientid);
6381 status = rpc_call_sync(clp->cl_rpcclient, &msg,
6382 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6383 trace_nfs4_setclientid_confirm(clp, status);
6384 dprintk("NFS reply setclientid_confirm: %d\n", status);
6385 return status;
6386 }
6387
6388 struct nfs4_delegreturndata {
6389 struct nfs4_delegreturnargs args;
6390 struct nfs4_delegreturnres res;
6391 struct nfs_fh fh;
6392 nfs4_stateid stateid;
6393 unsigned long timestamp;
6394 struct {
6395 struct nfs4_layoutreturn_args arg;
6396 struct nfs4_layoutreturn_res res;
6397 struct nfs4_xdr_opaque_data ld_private;
6398 u32 roc_barrier;
6399 bool roc;
6400 } lr;
6401 struct nfs_fattr fattr;
6402 int rpc_status;
6403 struct inode *inode;
6404 };
6405
nfs4_delegreturn_done(struct rpc_task * task,void * calldata)6406 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6407 {
6408 struct nfs4_delegreturndata *data = calldata;
6409 struct nfs4_exception exception = {
6410 .inode = data->inode,
6411 .stateid = &data->stateid,
6412 };
6413
6414 if (!nfs4_sequence_done(task, &data->res.seq_res))
6415 return;
6416
6417 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6418
6419 /* Handle Layoutreturn errors */
6420 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6421 &data->res.lr_ret) == -EAGAIN)
6422 goto out_restart;
6423
6424 switch (task->tk_status) {
6425 case 0:
6426 renew_lease(data->res.server, data->timestamp);
6427 break;
6428 case -NFS4ERR_ADMIN_REVOKED:
6429 case -NFS4ERR_DELEG_REVOKED:
6430 case -NFS4ERR_EXPIRED:
6431 nfs4_free_revoked_stateid(data->res.server,
6432 data->args.stateid,
6433 task->tk_msg.rpc_cred);
6434 fallthrough;
6435 case -NFS4ERR_BAD_STATEID:
6436 case -NFS4ERR_STALE_STATEID:
6437 case -ETIMEDOUT:
6438 task->tk_status = 0;
6439 break;
6440 case -NFS4ERR_OLD_STATEID:
6441 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6442 nfs4_stateid_seqid_inc(&data->stateid);
6443 if (data->args.bitmask) {
6444 data->args.bitmask = NULL;
6445 data->res.fattr = NULL;
6446 }
6447 goto out_restart;
6448 case -NFS4ERR_ACCESS:
6449 if (data->args.bitmask) {
6450 data->args.bitmask = NULL;
6451 data->res.fattr = NULL;
6452 goto out_restart;
6453 }
6454 fallthrough;
6455 default:
6456 task->tk_status = nfs4_async_handle_exception(task,
6457 data->res.server, task->tk_status,
6458 &exception);
6459 if (exception.retry)
6460 goto out_restart;
6461 }
6462 nfs_delegation_mark_returned(data->inode, data->args.stateid);
6463 data->rpc_status = task->tk_status;
6464 return;
6465 out_restart:
6466 task->tk_status = 0;
6467 rpc_restart_call_prepare(task);
6468 }
6469
nfs4_delegreturn_release(void * calldata)6470 static void nfs4_delegreturn_release(void *calldata)
6471 {
6472 struct nfs4_delegreturndata *data = calldata;
6473 struct inode *inode = data->inode;
6474
6475 if (data->lr.roc)
6476 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6477 data->res.lr_ret);
6478 if (inode) {
6479 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
6480 nfs_iput_and_deactive(inode);
6481 }
6482 kfree(calldata);
6483 }
6484
nfs4_delegreturn_prepare(struct rpc_task * task,void * data)6485 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6486 {
6487 struct nfs4_delegreturndata *d_data;
6488 struct pnfs_layout_hdr *lo;
6489
6490 d_data = (struct nfs4_delegreturndata *)data;
6491
6492 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6493 nfs4_sequence_done(task, &d_data->res.seq_res);
6494 return;
6495 }
6496
6497 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6498 if (lo && !pnfs_layout_is_valid(lo)) {
6499 d_data->args.lr_args = NULL;
6500 d_data->res.lr_res = NULL;
6501 }
6502
6503 nfs4_setup_sequence(d_data->res.server->nfs_client,
6504 &d_data->args.seq_args,
6505 &d_data->res.seq_res,
6506 task);
6507 }
6508
6509 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6510 .rpc_call_prepare = nfs4_delegreturn_prepare,
6511 .rpc_call_done = nfs4_delegreturn_done,
6512 .rpc_release = nfs4_delegreturn_release,
6513 };
6514
_nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,int issync)6515 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6516 {
6517 struct nfs4_delegreturndata *data;
6518 struct nfs_server *server = NFS_SERVER(inode);
6519 struct rpc_task *task;
6520 struct rpc_message msg = {
6521 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6522 .rpc_cred = cred,
6523 };
6524 struct rpc_task_setup task_setup_data = {
6525 .rpc_client = server->client,
6526 .rpc_message = &msg,
6527 .callback_ops = &nfs4_delegreturn_ops,
6528 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6529 };
6530 int status = 0;
6531
6532 data = kzalloc(sizeof(*data), GFP_NOFS);
6533 if (data == NULL)
6534 return -ENOMEM;
6535 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
6536
6537 nfs4_state_protect(server->nfs_client,
6538 NFS_SP4_MACH_CRED_CLEANUP,
6539 &task_setup_data.rpc_client, &msg);
6540
6541 data->args.fhandle = &data->fh;
6542 data->args.stateid = &data->stateid;
6543 nfs4_bitmask_set(data->args.bitmask_store,
6544 server->cache_consistency_bitmask, inode, server,
6545 NULL);
6546 data->args.bitmask = data->args.bitmask_store;
6547 nfs_copy_fh(&data->fh, NFS_FH(inode));
6548 nfs4_stateid_copy(&data->stateid, stateid);
6549 data->res.fattr = &data->fattr;
6550 data->res.server = server;
6551 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6552 data->lr.arg.ld_private = &data->lr.ld_private;
6553 nfs_fattr_init(data->res.fattr);
6554 data->timestamp = jiffies;
6555 data->rpc_status = 0;
6556 data->inode = nfs_igrab_and_active(inode);
6557 if (data->inode || issync) {
6558 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6559 cred);
6560 if (data->lr.roc) {
6561 data->args.lr_args = &data->lr.arg;
6562 data->res.lr_res = &data->lr.res;
6563 }
6564 }
6565
6566 task_setup_data.callback_data = data;
6567 msg.rpc_argp = &data->args;
6568 msg.rpc_resp = &data->res;
6569 task = rpc_run_task(&task_setup_data);
6570 if (IS_ERR(task))
6571 return PTR_ERR(task);
6572 if (!issync)
6573 goto out;
6574 status = rpc_wait_for_completion_task(task);
6575 if (status != 0)
6576 goto out;
6577 status = data->rpc_status;
6578 out:
6579 rpc_put_task(task);
6580 return status;
6581 }
6582
nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,int issync)6583 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6584 {
6585 struct nfs_server *server = NFS_SERVER(inode);
6586 struct nfs4_exception exception = { };
6587 int err;
6588 do {
6589 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6590 trace_nfs4_delegreturn(inode, stateid, err);
6591 switch (err) {
6592 case -NFS4ERR_STALE_STATEID:
6593 case -NFS4ERR_EXPIRED:
6594 case 0:
6595 return 0;
6596 }
6597 err = nfs4_handle_exception(server, err, &exception);
6598 } while (exception.retry);
6599 return err;
6600 }
6601
_nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6602 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6603 {
6604 struct inode *inode = state->inode;
6605 struct nfs_server *server = NFS_SERVER(inode);
6606 struct nfs_client *clp = server->nfs_client;
6607 struct nfs_lockt_args arg = {
6608 .fh = NFS_FH(inode),
6609 .fl = request,
6610 };
6611 struct nfs_lockt_res res = {
6612 .denied = request,
6613 };
6614 struct rpc_message msg = {
6615 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6616 .rpc_argp = &arg,
6617 .rpc_resp = &res,
6618 .rpc_cred = state->owner->so_cred,
6619 };
6620 struct nfs4_lock_state *lsp;
6621 int status;
6622
6623 arg.lock_owner.clientid = clp->cl_clientid;
6624 status = nfs4_set_lock_state(state, request);
6625 if (status != 0)
6626 goto out;
6627 lsp = request->fl_u.nfs4_fl.owner;
6628 arg.lock_owner.id = lsp->ls_seqid.owner_id;
6629 arg.lock_owner.s_dev = server->s_dev;
6630 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6631 switch (status) {
6632 case 0:
6633 request->fl_type = F_UNLCK;
6634 break;
6635 case -NFS4ERR_DENIED:
6636 status = 0;
6637 }
6638 request->fl_ops->fl_release_private(request);
6639 request->fl_ops = NULL;
6640 out:
6641 return status;
6642 }
6643
nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6644 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6645 {
6646 struct nfs4_exception exception = {
6647 .interruptible = true,
6648 };
6649 int err;
6650
6651 do {
6652 err = _nfs4_proc_getlk(state, cmd, request);
6653 trace_nfs4_get_lock(request, state, cmd, err);
6654 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6655 &exception);
6656 } while (exception.retry);
6657 return err;
6658 }
6659
6660 /*
6661 * Update the seqid of a lock stateid after receiving
6662 * NFS4ERR_OLD_STATEID
6663 */
nfs4_refresh_lock_old_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6664 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6665 struct nfs4_lock_state *lsp)
6666 {
6667 struct nfs4_state *state = lsp->ls_state;
6668 bool ret = false;
6669
6670 spin_lock(&state->state_lock);
6671 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6672 goto out;
6673 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6674 nfs4_stateid_seqid_inc(dst);
6675 else
6676 dst->seqid = lsp->ls_stateid.seqid;
6677 ret = true;
6678 out:
6679 spin_unlock(&state->state_lock);
6680 return ret;
6681 }
6682
nfs4_sync_lock_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6683 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6684 struct nfs4_lock_state *lsp)
6685 {
6686 struct nfs4_state *state = lsp->ls_state;
6687 bool ret;
6688
6689 spin_lock(&state->state_lock);
6690 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6691 nfs4_stateid_copy(dst, &lsp->ls_stateid);
6692 spin_unlock(&state->state_lock);
6693 return ret;
6694 }
6695
6696 struct nfs4_unlockdata {
6697 struct nfs_locku_args arg;
6698 struct nfs_locku_res res;
6699 struct nfs4_lock_state *lsp;
6700 struct nfs_open_context *ctx;
6701 struct nfs_lock_context *l_ctx;
6702 struct file_lock fl;
6703 struct nfs_server *server;
6704 unsigned long timestamp;
6705 };
6706
nfs4_alloc_unlockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)6707 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6708 struct nfs_open_context *ctx,
6709 struct nfs4_lock_state *lsp,
6710 struct nfs_seqid *seqid)
6711 {
6712 struct nfs4_unlockdata *p;
6713 struct nfs4_state *state = lsp->ls_state;
6714 struct inode *inode = state->inode;
6715
6716 p = kzalloc(sizeof(*p), GFP_NOFS);
6717 if (p == NULL)
6718 return NULL;
6719 p->arg.fh = NFS_FH(inode);
6720 p->arg.fl = &p->fl;
6721 p->arg.seqid = seqid;
6722 p->res.seqid = seqid;
6723 p->lsp = lsp;
6724 /* Ensure we don't close file until we're done freeing locks! */
6725 p->ctx = get_nfs_open_context(ctx);
6726 p->l_ctx = nfs_get_lock_context(ctx);
6727 locks_init_lock(&p->fl);
6728 locks_copy_lock(&p->fl, fl);
6729 p->server = NFS_SERVER(inode);
6730 spin_lock(&state->state_lock);
6731 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6732 spin_unlock(&state->state_lock);
6733 return p;
6734 }
6735
nfs4_locku_release_calldata(void * data)6736 static void nfs4_locku_release_calldata(void *data)
6737 {
6738 struct nfs4_unlockdata *calldata = data;
6739 nfs_free_seqid(calldata->arg.seqid);
6740 nfs4_put_lock_state(calldata->lsp);
6741 nfs_put_lock_context(calldata->l_ctx);
6742 put_nfs_open_context(calldata->ctx);
6743 kfree(calldata);
6744 }
6745
nfs4_locku_done(struct rpc_task * task,void * data)6746 static void nfs4_locku_done(struct rpc_task *task, void *data)
6747 {
6748 struct nfs4_unlockdata *calldata = data;
6749 struct nfs4_exception exception = {
6750 .inode = calldata->lsp->ls_state->inode,
6751 .stateid = &calldata->arg.stateid,
6752 };
6753
6754 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6755 return;
6756 switch (task->tk_status) {
6757 case 0:
6758 renew_lease(calldata->server, calldata->timestamp);
6759 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6760 if (nfs4_update_lock_stateid(calldata->lsp,
6761 &calldata->res.stateid))
6762 break;
6763 fallthrough;
6764 case -NFS4ERR_ADMIN_REVOKED:
6765 case -NFS4ERR_EXPIRED:
6766 nfs4_free_revoked_stateid(calldata->server,
6767 &calldata->arg.stateid,
6768 task->tk_msg.rpc_cred);
6769 fallthrough;
6770 case -NFS4ERR_BAD_STATEID:
6771 case -NFS4ERR_STALE_STATEID:
6772 if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6773 calldata->lsp))
6774 rpc_restart_call_prepare(task);
6775 break;
6776 case -NFS4ERR_OLD_STATEID:
6777 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6778 calldata->lsp))
6779 rpc_restart_call_prepare(task);
6780 break;
6781 default:
6782 task->tk_status = nfs4_async_handle_exception(task,
6783 calldata->server, task->tk_status,
6784 &exception);
6785 if (exception.retry)
6786 rpc_restart_call_prepare(task);
6787 }
6788 nfs_release_seqid(calldata->arg.seqid);
6789 }
6790
nfs4_locku_prepare(struct rpc_task * task,void * data)6791 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6792 {
6793 struct nfs4_unlockdata *calldata = data;
6794
6795 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6796 nfs_async_iocounter_wait(task, calldata->l_ctx))
6797 return;
6798
6799 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6800 goto out_wait;
6801 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6802 /* Note: exit _without_ running nfs4_locku_done */
6803 goto out_no_action;
6804 }
6805 calldata->timestamp = jiffies;
6806 if (nfs4_setup_sequence(calldata->server->nfs_client,
6807 &calldata->arg.seq_args,
6808 &calldata->res.seq_res,
6809 task) != 0)
6810 nfs_release_seqid(calldata->arg.seqid);
6811 return;
6812 out_no_action:
6813 task->tk_action = NULL;
6814 out_wait:
6815 nfs4_sequence_done(task, &calldata->res.seq_res);
6816 }
6817
6818 static const struct rpc_call_ops nfs4_locku_ops = {
6819 .rpc_call_prepare = nfs4_locku_prepare,
6820 .rpc_call_done = nfs4_locku_done,
6821 .rpc_release = nfs4_locku_release_calldata,
6822 };
6823
nfs4_do_unlck(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)6824 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6825 struct nfs_open_context *ctx,
6826 struct nfs4_lock_state *lsp,
6827 struct nfs_seqid *seqid)
6828 {
6829 struct nfs4_unlockdata *data;
6830 struct rpc_message msg = {
6831 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6832 .rpc_cred = ctx->cred,
6833 };
6834 struct rpc_task_setup task_setup_data = {
6835 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6836 .rpc_message = &msg,
6837 .callback_ops = &nfs4_locku_ops,
6838 .workqueue = nfsiod_workqueue,
6839 .flags = RPC_TASK_ASYNC,
6840 };
6841
6842 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6843 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6844
6845 /* Ensure this is an unlock - when canceling a lock, the
6846 * canceled lock is passed in, and it won't be an unlock.
6847 */
6848 fl->fl_type = F_UNLCK;
6849 if (fl->fl_flags & FL_CLOSE)
6850 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6851
6852 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6853 if (data == NULL) {
6854 nfs_free_seqid(seqid);
6855 return ERR_PTR(-ENOMEM);
6856 }
6857
6858 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6859 msg.rpc_argp = &data->arg;
6860 msg.rpc_resp = &data->res;
6861 task_setup_data.callback_data = data;
6862 return rpc_run_task(&task_setup_data);
6863 }
6864
nfs4_proc_unlck(struct nfs4_state * state,int cmd,struct file_lock * request)6865 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6866 {
6867 struct inode *inode = state->inode;
6868 struct nfs4_state_owner *sp = state->owner;
6869 struct nfs_inode *nfsi = NFS_I(inode);
6870 struct nfs_seqid *seqid;
6871 struct nfs4_lock_state *lsp;
6872 struct rpc_task *task;
6873 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6874 int status = 0;
6875 unsigned char fl_flags = request->fl_flags;
6876
6877 status = nfs4_set_lock_state(state, request);
6878 /* Unlock _before_ we do the RPC call */
6879 request->fl_flags |= FL_EXISTS;
6880 /* Exclude nfs_delegation_claim_locks() */
6881 mutex_lock(&sp->so_delegreturn_mutex);
6882 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6883 down_read(&nfsi->rwsem);
6884 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6885 up_read(&nfsi->rwsem);
6886 mutex_unlock(&sp->so_delegreturn_mutex);
6887 goto out;
6888 }
6889 up_read(&nfsi->rwsem);
6890 mutex_unlock(&sp->so_delegreturn_mutex);
6891 if (status != 0)
6892 goto out;
6893 /* Is this a delegated lock? */
6894 lsp = request->fl_u.nfs4_fl.owner;
6895 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6896 goto out;
6897 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6898 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6899 status = -ENOMEM;
6900 if (IS_ERR(seqid))
6901 goto out;
6902 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6903 status = PTR_ERR(task);
6904 if (IS_ERR(task))
6905 goto out;
6906 status = rpc_wait_for_completion_task(task);
6907 rpc_put_task(task);
6908 out:
6909 request->fl_flags = fl_flags;
6910 trace_nfs4_unlock(request, state, F_SETLK, status);
6911 return status;
6912 }
6913
6914 struct nfs4_lockdata {
6915 struct nfs_lock_args arg;
6916 struct nfs_lock_res res;
6917 struct nfs4_lock_state *lsp;
6918 struct nfs_open_context *ctx;
6919 struct file_lock fl;
6920 unsigned long timestamp;
6921 int rpc_status;
6922 int cancelled;
6923 struct nfs_server *server;
6924 };
6925
nfs4_alloc_lockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,gfp_t gfp_mask)6926 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6927 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6928 gfp_t gfp_mask)
6929 {
6930 struct nfs4_lockdata *p;
6931 struct inode *inode = lsp->ls_state->inode;
6932 struct nfs_server *server = NFS_SERVER(inode);
6933 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6934
6935 p = kzalloc(sizeof(*p), gfp_mask);
6936 if (p == NULL)
6937 return NULL;
6938
6939 p->arg.fh = NFS_FH(inode);
6940 p->arg.fl = &p->fl;
6941 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6942 if (IS_ERR(p->arg.open_seqid))
6943 goto out_free;
6944 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6945 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6946 if (IS_ERR(p->arg.lock_seqid))
6947 goto out_free_seqid;
6948 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6949 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6950 p->arg.lock_owner.s_dev = server->s_dev;
6951 p->res.lock_seqid = p->arg.lock_seqid;
6952 p->lsp = lsp;
6953 p->server = server;
6954 p->ctx = get_nfs_open_context(ctx);
6955 locks_init_lock(&p->fl);
6956 locks_copy_lock(&p->fl, fl);
6957 return p;
6958 out_free_seqid:
6959 nfs_free_seqid(p->arg.open_seqid);
6960 out_free:
6961 kfree(p);
6962 return NULL;
6963 }
6964
nfs4_lock_prepare(struct rpc_task * task,void * calldata)6965 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6966 {
6967 struct nfs4_lockdata *data = calldata;
6968 struct nfs4_state *state = data->lsp->ls_state;
6969
6970 dprintk("%s: begin!\n", __func__);
6971 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6972 goto out_wait;
6973 /* Do we need to do an open_to_lock_owner? */
6974 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6975 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6976 goto out_release_lock_seqid;
6977 }
6978 nfs4_stateid_copy(&data->arg.open_stateid,
6979 &state->open_stateid);
6980 data->arg.new_lock_owner = 1;
6981 data->res.open_seqid = data->arg.open_seqid;
6982 } else {
6983 data->arg.new_lock_owner = 0;
6984 nfs4_stateid_copy(&data->arg.lock_stateid,
6985 &data->lsp->ls_stateid);
6986 }
6987 if (!nfs4_valid_open_stateid(state)) {
6988 data->rpc_status = -EBADF;
6989 task->tk_action = NULL;
6990 goto out_release_open_seqid;
6991 }
6992 data->timestamp = jiffies;
6993 if (nfs4_setup_sequence(data->server->nfs_client,
6994 &data->arg.seq_args,
6995 &data->res.seq_res,
6996 task) == 0)
6997 return;
6998 out_release_open_seqid:
6999 nfs_release_seqid(data->arg.open_seqid);
7000 out_release_lock_seqid:
7001 nfs_release_seqid(data->arg.lock_seqid);
7002 out_wait:
7003 nfs4_sequence_done(task, &data->res.seq_res);
7004 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
7005 }
7006
nfs4_lock_done(struct rpc_task * task,void * calldata)7007 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7008 {
7009 struct nfs4_lockdata *data = calldata;
7010 struct nfs4_lock_state *lsp = data->lsp;
7011
7012 dprintk("%s: begin!\n", __func__);
7013
7014 if (!nfs4_sequence_done(task, &data->res.seq_res))
7015 return;
7016
7017 data->rpc_status = task->tk_status;
7018 switch (task->tk_status) {
7019 case 0:
7020 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7021 data->timestamp);
7022 if (data->arg.new_lock && !data->cancelled) {
7023 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7024 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7025 goto out_restart;
7026 }
7027 if (data->arg.new_lock_owner != 0) {
7028 nfs_confirm_seqid(&lsp->ls_seqid, 0);
7029 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7030 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7031 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7032 goto out_restart;
7033 break;
7034 case -NFS4ERR_BAD_STATEID:
7035 case -NFS4ERR_OLD_STATEID:
7036 case -NFS4ERR_STALE_STATEID:
7037 case -NFS4ERR_EXPIRED:
7038 if (data->arg.new_lock_owner != 0) {
7039 if (!nfs4_stateid_match(&data->arg.open_stateid,
7040 &lsp->ls_state->open_stateid))
7041 goto out_restart;
7042 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7043 &lsp->ls_stateid))
7044 goto out_restart;
7045 }
7046 out_done:
7047 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
7048 return;
7049 out_restart:
7050 if (!data->cancelled)
7051 rpc_restart_call_prepare(task);
7052 goto out_done;
7053 }
7054
nfs4_lock_release(void * calldata)7055 static void nfs4_lock_release(void *calldata)
7056 {
7057 struct nfs4_lockdata *data = calldata;
7058
7059 dprintk("%s: begin!\n", __func__);
7060 nfs_free_seqid(data->arg.open_seqid);
7061 if (data->cancelled && data->rpc_status == 0) {
7062 struct rpc_task *task;
7063 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7064 data->arg.lock_seqid);
7065 if (!IS_ERR(task))
7066 rpc_put_task_async(task);
7067 dprintk("%s: cancelling lock!\n", __func__);
7068 } else
7069 nfs_free_seqid(data->arg.lock_seqid);
7070 nfs4_put_lock_state(data->lsp);
7071 put_nfs_open_context(data->ctx);
7072 kfree(data);
7073 dprintk("%s: done!\n", __func__);
7074 }
7075
7076 static const struct rpc_call_ops nfs4_lock_ops = {
7077 .rpc_call_prepare = nfs4_lock_prepare,
7078 .rpc_call_done = nfs4_lock_done,
7079 .rpc_release = nfs4_lock_release,
7080 };
7081
nfs4_handle_setlk_error(struct nfs_server * server,struct nfs4_lock_state * lsp,int new_lock_owner,int error)7082 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7083 {
7084 switch (error) {
7085 case -NFS4ERR_ADMIN_REVOKED:
7086 case -NFS4ERR_EXPIRED:
7087 case -NFS4ERR_BAD_STATEID:
7088 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7089 if (new_lock_owner != 0 ||
7090 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7091 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7092 break;
7093 case -NFS4ERR_STALE_STATEID:
7094 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7095 nfs4_schedule_lease_recovery(server->nfs_client);
7096 }
7097 }
7098
_nfs4_do_setlk(struct nfs4_state * state,int cmd,struct file_lock * fl,int recovery_type)7099 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7100 {
7101 struct nfs4_lockdata *data;
7102 struct rpc_task *task;
7103 struct rpc_message msg = {
7104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7105 .rpc_cred = state->owner->so_cred,
7106 };
7107 struct rpc_task_setup task_setup_data = {
7108 .rpc_client = NFS_CLIENT(state->inode),
7109 .rpc_message = &msg,
7110 .callback_ops = &nfs4_lock_ops,
7111 .workqueue = nfsiod_workqueue,
7112 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7113 };
7114 int ret;
7115
7116 dprintk("%s: begin!\n", __func__);
7117 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7118 fl->fl_u.nfs4_fl.owner,
7119 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
7120 if (data == NULL)
7121 return -ENOMEM;
7122 if (IS_SETLKW(cmd))
7123 data->arg.block = 1;
7124 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7125 recovery_type > NFS_LOCK_NEW);
7126 msg.rpc_argp = &data->arg;
7127 msg.rpc_resp = &data->res;
7128 task_setup_data.callback_data = data;
7129 if (recovery_type > NFS_LOCK_NEW) {
7130 if (recovery_type == NFS_LOCK_RECLAIM)
7131 data->arg.reclaim = NFS_LOCK_RECLAIM;
7132 } else
7133 data->arg.new_lock = 1;
7134 task = rpc_run_task(&task_setup_data);
7135 if (IS_ERR(task))
7136 return PTR_ERR(task);
7137 ret = rpc_wait_for_completion_task(task);
7138 if (ret == 0) {
7139 ret = data->rpc_status;
7140 if (ret)
7141 nfs4_handle_setlk_error(data->server, data->lsp,
7142 data->arg.new_lock_owner, ret);
7143 } else
7144 data->cancelled = true;
7145 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7146 rpc_put_task(task);
7147 dprintk("%s: done, ret = %d!\n", __func__, ret);
7148 return ret;
7149 }
7150
nfs4_lock_reclaim(struct nfs4_state * state,struct file_lock * request)7151 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7152 {
7153 struct nfs_server *server = NFS_SERVER(state->inode);
7154 struct nfs4_exception exception = {
7155 .inode = state->inode,
7156 };
7157 int err;
7158
7159 do {
7160 /* Cache the lock if possible... */
7161 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7162 return 0;
7163 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7164 if (err != -NFS4ERR_DELAY)
7165 break;
7166 nfs4_handle_exception(server, err, &exception);
7167 } while (exception.retry);
7168 return err;
7169 }
7170
nfs4_lock_expired(struct nfs4_state * state,struct file_lock * request)7171 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7172 {
7173 struct nfs_server *server = NFS_SERVER(state->inode);
7174 struct nfs4_exception exception = {
7175 .inode = state->inode,
7176 };
7177 int err;
7178
7179 err = nfs4_set_lock_state(state, request);
7180 if (err != 0)
7181 return err;
7182 if (!recover_lost_locks) {
7183 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7184 return 0;
7185 }
7186 do {
7187 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7188 return 0;
7189 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7190 switch (err) {
7191 default:
7192 goto out;
7193 case -NFS4ERR_GRACE:
7194 case -NFS4ERR_DELAY:
7195 nfs4_handle_exception(server, err, &exception);
7196 err = 0;
7197 }
7198 } while (exception.retry);
7199 out:
7200 return err;
7201 }
7202
7203 #if defined(CONFIG_NFS_V4_1)
nfs41_lock_expired(struct nfs4_state * state,struct file_lock * request)7204 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7205 {
7206 struct nfs4_lock_state *lsp;
7207 int status;
7208
7209 status = nfs4_set_lock_state(state, request);
7210 if (status != 0)
7211 return status;
7212 lsp = request->fl_u.nfs4_fl.owner;
7213 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7214 test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7215 return 0;
7216 return nfs4_lock_expired(state, request);
7217 }
7218 #endif
7219
_nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7220 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7221 {
7222 struct nfs_inode *nfsi = NFS_I(state->inode);
7223 struct nfs4_state_owner *sp = state->owner;
7224 unsigned char fl_flags = request->fl_flags;
7225 int status;
7226
7227 request->fl_flags |= FL_ACCESS;
7228 status = locks_lock_inode_wait(state->inode, request);
7229 if (status < 0)
7230 goto out;
7231 mutex_lock(&sp->so_delegreturn_mutex);
7232 down_read(&nfsi->rwsem);
7233 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7234 /* Yes: cache locks! */
7235 /* ...but avoid races with delegation recall... */
7236 request->fl_flags = fl_flags & ~FL_SLEEP;
7237 status = locks_lock_inode_wait(state->inode, request);
7238 up_read(&nfsi->rwsem);
7239 mutex_unlock(&sp->so_delegreturn_mutex);
7240 goto out;
7241 }
7242 up_read(&nfsi->rwsem);
7243 mutex_unlock(&sp->so_delegreturn_mutex);
7244 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7245 out:
7246 request->fl_flags = fl_flags;
7247 return status;
7248 }
7249
nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7250 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7251 {
7252 struct nfs4_exception exception = {
7253 .state = state,
7254 .inode = state->inode,
7255 .interruptible = true,
7256 };
7257 int err;
7258
7259 do {
7260 err = _nfs4_proc_setlk(state, cmd, request);
7261 if (err == -NFS4ERR_DENIED)
7262 err = -EAGAIN;
7263 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7264 err, &exception);
7265 } while (exception.retry);
7266 return err;
7267 }
7268
7269 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7270 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7271
7272 static int
nfs4_retry_setlk_simple(struct nfs4_state * state,int cmd,struct file_lock * request)7273 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7274 struct file_lock *request)
7275 {
7276 int status = -ERESTARTSYS;
7277 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
7278
7279 while(!signalled()) {
7280 status = nfs4_proc_setlk(state, cmd, request);
7281 if ((status != -EAGAIN) || IS_SETLK(cmd))
7282 break;
7283 freezable_schedule_timeout_interruptible(timeout);
7284 timeout *= 2;
7285 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7286 status = -ERESTARTSYS;
7287 }
7288 return status;
7289 }
7290
7291 #ifdef CONFIG_NFS_V4_1
7292 struct nfs4_lock_waiter {
7293 struct inode *inode;
7294 struct nfs_lowner owner;
7295 wait_queue_entry_t wait;
7296 };
7297
7298 static int
nfs4_wake_lock_waiter(wait_queue_entry_t * wait,unsigned int mode,int flags,void * key)7299 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7300 {
7301 struct nfs4_lock_waiter *waiter =
7302 container_of(wait, struct nfs4_lock_waiter, wait);
7303
7304 /* NULL key means to wake up everyone */
7305 if (key) {
7306 struct cb_notify_lock_args *cbnl = key;
7307 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
7308 *wowner = &waiter->owner;
7309
7310 /* Only wake if the callback was for the same owner. */
7311 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7312 return 0;
7313
7314 /* Make sure it's for the right inode */
7315 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7316 return 0;
7317 }
7318
7319 return woken_wake_function(wait, mode, flags, key);
7320 }
7321
7322 static int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7323 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7324 {
7325 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7326 struct nfs_server *server = NFS_SERVER(state->inode);
7327 struct nfs_client *clp = server->nfs_client;
7328 wait_queue_head_t *q = &clp->cl_lock_waitq;
7329 struct nfs4_lock_waiter waiter = {
7330 .inode = state->inode,
7331 .owner = { .clientid = clp->cl_clientid,
7332 .id = lsp->ls_seqid.owner_id,
7333 .s_dev = server->s_dev },
7334 };
7335 int status;
7336
7337 /* Don't bother with waitqueue if we don't expect a callback */
7338 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7339 return nfs4_retry_setlk_simple(state, cmd, request);
7340
7341 init_wait(&waiter.wait);
7342 waiter.wait.func = nfs4_wake_lock_waiter;
7343 add_wait_queue(q, &waiter.wait);
7344
7345 do {
7346 status = nfs4_proc_setlk(state, cmd, request);
7347 if (status != -EAGAIN || IS_SETLK(cmd))
7348 break;
7349
7350 status = -ERESTARTSYS;
7351 freezer_do_not_count();
7352 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE,
7353 NFS4_LOCK_MAXTIMEOUT);
7354 freezer_count();
7355 } while (!signalled());
7356
7357 remove_wait_queue(q, &waiter.wait);
7358
7359 return status;
7360 }
7361 #else /* !CONFIG_NFS_V4_1 */
7362 static inline int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7363 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7364 {
7365 return nfs4_retry_setlk_simple(state, cmd, request);
7366 }
7367 #endif
7368
7369 static int
nfs4_proc_lock(struct file * filp,int cmd,struct file_lock * request)7370 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7371 {
7372 struct nfs_open_context *ctx;
7373 struct nfs4_state *state;
7374 int status;
7375
7376 /* verify open state */
7377 ctx = nfs_file_open_context(filp);
7378 state = ctx->state;
7379
7380 if (IS_GETLK(cmd)) {
7381 if (state != NULL)
7382 return nfs4_proc_getlk(state, F_GETLK, request);
7383 return 0;
7384 }
7385
7386 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7387 return -EINVAL;
7388
7389 if (request->fl_type == F_UNLCK) {
7390 if (state != NULL)
7391 return nfs4_proc_unlck(state, cmd, request);
7392 return 0;
7393 }
7394
7395 if (state == NULL)
7396 return -ENOLCK;
7397
7398 if ((request->fl_flags & FL_POSIX) &&
7399 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7400 return -ENOLCK;
7401
7402 /*
7403 * Don't rely on the VFS having checked the file open mode,
7404 * since it won't do this for flock() locks.
7405 */
7406 switch (request->fl_type) {
7407 case F_RDLCK:
7408 if (!(filp->f_mode & FMODE_READ))
7409 return -EBADF;
7410 break;
7411 case F_WRLCK:
7412 if (!(filp->f_mode & FMODE_WRITE))
7413 return -EBADF;
7414 }
7415
7416 status = nfs4_set_lock_state(state, request);
7417 if (status != 0)
7418 return status;
7419
7420 return nfs4_retry_setlk(state, cmd, request);
7421 }
7422
nfs4_lock_delegation_recall(struct file_lock * fl,struct nfs4_state * state,const nfs4_stateid * stateid)7423 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7424 {
7425 struct nfs_server *server = NFS_SERVER(state->inode);
7426 int err;
7427
7428 err = nfs4_set_lock_state(state, fl);
7429 if (err != 0)
7430 return err;
7431 do {
7432 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7433 if (err != -NFS4ERR_DELAY)
7434 break;
7435 ssleep(1);
7436 } while (err == -NFS4ERR_DELAY);
7437 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7438 }
7439
7440 struct nfs_release_lockowner_data {
7441 struct nfs4_lock_state *lsp;
7442 struct nfs_server *server;
7443 struct nfs_release_lockowner_args args;
7444 struct nfs_release_lockowner_res res;
7445 unsigned long timestamp;
7446 };
7447
nfs4_release_lockowner_prepare(struct rpc_task * task,void * calldata)7448 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7449 {
7450 struct nfs_release_lockowner_data *data = calldata;
7451 struct nfs_server *server = data->server;
7452 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7453 &data->res.seq_res, task);
7454 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7455 data->timestamp = jiffies;
7456 }
7457
nfs4_release_lockowner_done(struct rpc_task * task,void * calldata)7458 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7459 {
7460 struct nfs_release_lockowner_data *data = calldata;
7461 struct nfs_server *server = data->server;
7462
7463 nfs40_sequence_done(task, &data->res.seq_res);
7464
7465 switch (task->tk_status) {
7466 case 0:
7467 renew_lease(server, data->timestamp);
7468 break;
7469 case -NFS4ERR_STALE_CLIENTID:
7470 case -NFS4ERR_EXPIRED:
7471 nfs4_schedule_lease_recovery(server->nfs_client);
7472 break;
7473 case -NFS4ERR_LEASE_MOVED:
7474 case -NFS4ERR_DELAY:
7475 if (nfs4_async_handle_error(task, server,
7476 NULL, NULL) == -EAGAIN)
7477 rpc_restart_call_prepare(task);
7478 }
7479 }
7480
nfs4_release_lockowner_release(void * calldata)7481 static void nfs4_release_lockowner_release(void *calldata)
7482 {
7483 struct nfs_release_lockowner_data *data = calldata;
7484 nfs4_free_lock_state(data->server, data->lsp);
7485 kfree(calldata);
7486 }
7487
7488 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7489 .rpc_call_prepare = nfs4_release_lockowner_prepare,
7490 .rpc_call_done = nfs4_release_lockowner_done,
7491 .rpc_release = nfs4_release_lockowner_release,
7492 };
7493
7494 static void
nfs4_release_lockowner(struct nfs_server * server,struct nfs4_lock_state * lsp)7495 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7496 {
7497 struct nfs_release_lockowner_data *data;
7498 struct rpc_message msg = {
7499 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7500 };
7501
7502 if (server->nfs_client->cl_mvops->minor_version != 0)
7503 return;
7504
7505 data = kmalloc(sizeof(*data), GFP_NOFS);
7506 if (!data)
7507 return;
7508 data->lsp = lsp;
7509 data->server = server;
7510 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7511 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7512 data->args.lock_owner.s_dev = server->s_dev;
7513
7514 msg.rpc_argp = &data->args;
7515 msg.rpc_resp = &data->res;
7516 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7517 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7518 }
7519
7520 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7521
nfs4_xattr_set_nfs4_acl(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7522 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7523 struct user_namespace *mnt_userns,
7524 struct dentry *unused, struct inode *inode,
7525 const char *key, const void *buf,
7526 size_t buflen, int flags)
7527 {
7528 return nfs4_proc_set_acl(inode, buf, buflen);
7529 }
7530
nfs4_xattr_get_nfs4_acl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7531 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7532 struct dentry *unused, struct inode *inode,
7533 const char *key, void *buf, size_t buflen)
7534 {
7535 return nfs4_proc_get_acl(inode, buf, buflen);
7536 }
7537
nfs4_xattr_list_nfs4_acl(struct dentry * dentry)7538 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7539 {
7540 return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
7541 }
7542
7543 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7544
nfs4_xattr_set_nfs4_label(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7545 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7546 struct user_namespace *mnt_userns,
7547 struct dentry *unused, struct inode *inode,
7548 const char *key, const void *buf,
7549 size_t buflen, int flags)
7550 {
7551 if (security_ismaclabel(key))
7552 return nfs4_set_security_label(inode, buf, buflen);
7553
7554 return -EOPNOTSUPP;
7555 }
7556
nfs4_xattr_get_nfs4_label(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7557 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7558 struct dentry *unused, struct inode *inode,
7559 const char *key, void *buf, size_t buflen)
7560 {
7561 if (security_ismaclabel(key))
7562 return nfs4_get_security_label(inode, buf, buflen);
7563 return -EOPNOTSUPP;
7564 }
7565
7566 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)7567 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7568 {
7569 int len = 0;
7570
7571 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7572 len = security_inode_listsecurity(inode, list, list_len);
7573 if (len >= 0 && list_len && len > list_len)
7574 return -ERANGE;
7575 }
7576 return len;
7577 }
7578
7579 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7580 .prefix = XATTR_SECURITY_PREFIX,
7581 .get = nfs4_xattr_get_nfs4_label,
7582 .set = nfs4_xattr_set_nfs4_label,
7583 };
7584
7585 #else
7586
7587 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)7588 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7589 {
7590 return 0;
7591 }
7592
7593 #endif
7594
7595 #ifdef CONFIG_NFS_V4_2
nfs4_xattr_set_nfs4_user(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7596 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7597 struct user_namespace *mnt_userns,
7598 struct dentry *unused, struct inode *inode,
7599 const char *key, const void *buf,
7600 size_t buflen, int flags)
7601 {
7602 struct nfs_access_entry cache;
7603 int ret;
7604
7605 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7606 return -EOPNOTSUPP;
7607
7608 /*
7609 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7610 * flags right now. Handling of xattr operations use the normal
7611 * file read/write permissions.
7612 *
7613 * Just in case the server has other ideas (which RFC 8276 allows),
7614 * do a cached access check for the XA* flags to possibly avoid
7615 * doing an RPC and getting EACCES back.
7616 */
7617 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7618 if (!(cache.mask & NFS_ACCESS_XAWRITE))
7619 return -EACCES;
7620 }
7621
7622 if (buf == NULL) {
7623 ret = nfs42_proc_removexattr(inode, key);
7624 if (!ret)
7625 nfs4_xattr_cache_remove(inode, key);
7626 } else {
7627 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7628 if (!ret)
7629 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7630 }
7631
7632 return ret;
7633 }
7634
nfs4_xattr_get_nfs4_user(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7635 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7636 struct dentry *unused, struct inode *inode,
7637 const char *key, void *buf, size_t buflen)
7638 {
7639 struct nfs_access_entry cache;
7640 ssize_t ret;
7641
7642 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7643 return -EOPNOTSUPP;
7644
7645 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7646 if (!(cache.mask & NFS_ACCESS_XAREAD))
7647 return -EACCES;
7648 }
7649
7650 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7651 if (ret)
7652 return ret;
7653
7654 ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7655 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7656 return ret;
7657
7658 ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7659
7660 return ret;
7661 }
7662
7663 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)7664 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7665 {
7666 u64 cookie;
7667 bool eof;
7668 ssize_t ret, size;
7669 char *buf;
7670 size_t buflen;
7671 struct nfs_access_entry cache;
7672
7673 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7674 return 0;
7675
7676 if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7677 if (!(cache.mask & NFS_ACCESS_XALIST))
7678 return 0;
7679 }
7680
7681 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7682 if (ret)
7683 return ret;
7684
7685 ret = nfs4_xattr_cache_list(inode, list, list_len);
7686 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7687 return ret;
7688
7689 cookie = 0;
7690 eof = false;
7691 buflen = list_len ? list_len : XATTR_LIST_MAX;
7692 buf = list_len ? list : NULL;
7693 size = 0;
7694
7695 while (!eof) {
7696 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7697 &cookie, &eof);
7698 if (ret < 0)
7699 return ret;
7700
7701 if (list_len) {
7702 buf += ret;
7703 buflen -= ret;
7704 }
7705 size += ret;
7706 }
7707
7708 if (list_len)
7709 nfs4_xattr_cache_set_list(inode, list, size);
7710
7711 return size;
7712 }
7713
7714 #else
7715
7716 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)7717 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7718 {
7719 return 0;
7720 }
7721 #endif /* CONFIG_NFS_V4_2 */
7722
7723 /*
7724 * nfs_fhget will use either the mounted_on_fileid or the fileid
7725 */
nfs_fixup_referral_attributes(struct nfs_fattr * fattr)7726 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7727 {
7728 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7729 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7730 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7731 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7732 return;
7733
7734 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7735 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7736 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7737 fattr->nlink = 2;
7738 }
7739
_nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)7740 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7741 const struct qstr *name,
7742 struct nfs4_fs_locations *fs_locations,
7743 struct page *page)
7744 {
7745 struct nfs_server *server = NFS_SERVER(dir);
7746 u32 bitmask[3];
7747 struct nfs4_fs_locations_arg args = {
7748 .dir_fh = NFS_FH(dir),
7749 .name = name,
7750 .page = page,
7751 .bitmask = bitmask,
7752 };
7753 struct nfs4_fs_locations_res res = {
7754 .fs_locations = fs_locations,
7755 };
7756 struct rpc_message msg = {
7757 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7758 .rpc_argp = &args,
7759 .rpc_resp = &res,
7760 };
7761 int status;
7762
7763 dprintk("%s: start\n", __func__);
7764
7765 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7766 bitmask[1] = nfs4_fattr_bitmap[1];
7767
7768 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7769 * is not supported */
7770 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7771 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7772 else
7773 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7774
7775 nfs_fattr_init(&fs_locations->fattr);
7776 fs_locations->server = server;
7777 fs_locations->nlocations = 0;
7778 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7779 dprintk("%s: returned status = %d\n", __func__, status);
7780 return status;
7781 }
7782
nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)7783 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7784 const struct qstr *name,
7785 struct nfs4_fs_locations *fs_locations,
7786 struct page *page)
7787 {
7788 struct nfs4_exception exception = {
7789 .interruptible = true,
7790 };
7791 int err;
7792 do {
7793 err = _nfs4_proc_fs_locations(client, dir, name,
7794 fs_locations, page);
7795 trace_nfs4_get_fs_locations(dir, name, err);
7796 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7797 &exception);
7798 } while (exception.retry);
7799 return err;
7800 }
7801
7802 /*
7803 * This operation also signals the server that this client is
7804 * performing migration recovery. The server can stop returning
7805 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
7806 * appended to this compound to identify the client ID which is
7807 * performing recovery.
7808 */
_nfs40_proc_get_locations(struct inode * inode,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)7809 static int _nfs40_proc_get_locations(struct inode *inode,
7810 struct nfs4_fs_locations *locations,
7811 struct page *page, const struct cred *cred)
7812 {
7813 struct nfs_server *server = NFS_SERVER(inode);
7814 struct rpc_clnt *clnt = server->client;
7815 u32 bitmask[2] = {
7816 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7817 };
7818 struct nfs4_fs_locations_arg args = {
7819 .clientid = server->nfs_client->cl_clientid,
7820 .fh = NFS_FH(inode),
7821 .page = page,
7822 .bitmask = bitmask,
7823 .migration = 1, /* skip LOOKUP */
7824 .renew = 1, /* append RENEW */
7825 };
7826 struct nfs4_fs_locations_res res = {
7827 .fs_locations = locations,
7828 .migration = 1,
7829 .renew = 1,
7830 };
7831 struct rpc_message msg = {
7832 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7833 .rpc_argp = &args,
7834 .rpc_resp = &res,
7835 .rpc_cred = cred,
7836 };
7837 unsigned long now = jiffies;
7838 int status;
7839
7840 nfs_fattr_init(&locations->fattr);
7841 locations->server = server;
7842 locations->nlocations = 0;
7843
7844 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7845 status = nfs4_call_sync_sequence(clnt, server, &msg,
7846 &args.seq_args, &res.seq_res);
7847 if (status)
7848 return status;
7849
7850 renew_lease(server, now);
7851 return 0;
7852 }
7853
7854 #ifdef CONFIG_NFS_V4_1
7855
7856 /*
7857 * This operation also signals the server that this client is
7858 * performing migration recovery. The server can stop asserting
7859 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
7860 * performing this operation is identified in the SEQUENCE
7861 * operation in this compound.
7862 *
7863 * When the client supports GETATTR(fs_locations_info), it can
7864 * be plumbed in here.
7865 */
_nfs41_proc_get_locations(struct inode * inode,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)7866 static int _nfs41_proc_get_locations(struct inode *inode,
7867 struct nfs4_fs_locations *locations,
7868 struct page *page, const struct cred *cred)
7869 {
7870 struct nfs_server *server = NFS_SERVER(inode);
7871 struct rpc_clnt *clnt = server->client;
7872 u32 bitmask[2] = {
7873 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7874 };
7875 struct nfs4_fs_locations_arg args = {
7876 .fh = NFS_FH(inode),
7877 .page = page,
7878 .bitmask = bitmask,
7879 .migration = 1, /* skip LOOKUP */
7880 };
7881 struct nfs4_fs_locations_res res = {
7882 .fs_locations = locations,
7883 .migration = 1,
7884 };
7885 struct rpc_message msg = {
7886 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7887 .rpc_argp = &args,
7888 .rpc_resp = &res,
7889 .rpc_cred = cred,
7890 };
7891 int status;
7892
7893 nfs_fattr_init(&locations->fattr);
7894 locations->server = server;
7895 locations->nlocations = 0;
7896
7897 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7898 status = nfs4_call_sync_sequence(clnt, server, &msg,
7899 &args.seq_args, &res.seq_res);
7900 if (status == NFS4_OK &&
7901 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7902 status = -NFS4ERR_LEASE_MOVED;
7903 return status;
7904 }
7905
7906 #endif /* CONFIG_NFS_V4_1 */
7907
7908 /**
7909 * nfs4_proc_get_locations - discover locations for a migrated FSID
7910 * @inode: inode on FSID that is migrating
7911 * @locations: result of query
7912 * @page: buffer
7913 * @cred: credential to use for this operation
7914 *
7915 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
7916 * operation failed, or a negative errno if a local error occurred.
7917 *
7918 * On success, "locations" is filled in, but if the server has
7919 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
7920 * asserted.
7921 *
7922 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
7923 * from this client that require migration recovery.
7924 */
nfs4_proc_get_locations(struct inode * inode,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)7925 int nfs4_proc_get_locations(struct inode *inode,
7926 struct nfs4_fs_locations *locations,
7927 struct page *page, const struct cred *cred)
7928 {
7929 struct nfs_server *server = NFS_SERVER(inode);
7930 struct nfs_client *clp = server->nfs_client;
7931 const struct nfs4_mig_recovery_ops *ops =
7932 clp->cl_mvops->mig_recovery_ops;
7933 struct nfs4_exception exception = {
7934 .interruptible = true,
7935 };
7936 int status;
7937
7938 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7939 (unsigned long long)server->fsid.major,
7940 (unsigned long long)server->fsid.minor,
7941 clp->cl_hostname);
7942 nfs_display_fhandle(NFS_FH(inode), __func__);
7943
7944 do {
7945 status = ops->get_locations(inode, locations, page, cred);
7946 if (status != -NFS4ERR_DELAY)
7947 break;
7948 nfs4_handle_exception(server, status, &exception);
7949 } while (exception.retry);
7950 return status;
7951 }
7952
7953 /*
7954 * This operation also signals the server that this client is
7955 * performing "lease moved" recovery. The server can stop
7956 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
7957 * is appended to this compound to identify the client ID which is
7958 * performing recovery.
7959 */
_nfs40_proc_fsid_present(struct inode * inode,const struct cred * cred)7960 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
7961 {
7962 struct nfs_server *server = NFS_SERVER(inode);
7963 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7964 struct rpc_clnt *clnt = server->client;
7965 struct nfs4_fsid_present_arg args = {
7966 .fh = NFS_FH(inode),
7967 .clientid = clp->cl_clientid,
7968 .renew = 1, /* append RENEW */
7969 };
7970 struct nfs4_fsid_present_res res = {
7971 .renew = 1,
7972 };
7973 struct rpc_message msg = {
7974 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7975 .rpc_argp = &args,
7976 .rpc_resp = &res,
7977 .rpc_cred = cred,
7978 };
7979 unsigned long now = jiffies;
7980 int status;
7981
7982 res.fh = nfs_alloc_fhandle();
7983 if (res.fh == NULL)
7984 return -ENOMEM;
7985
7986 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7987 status = nfs4_call_sync_sequence(clnt, server, &msg,
7988 &args.seq_args, &res.seq_res);
7989 nfs_free_fhandle(res.fh);
7990 if (status)
7991 return status;
7992
7993 do_renew_lease(clp, now);
7994 return 0;
7995 }
7996
7997 #ifdef CONFIG_NFS_V4_1
7998
7999 /*
8000 * This operation also signals the server that this client is
8001 * performing "lease moved" recovery. The server can stop asserting
8002 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
8003 * this operation is identified in the SEQUENCE operation in this
8004 * compound.
8005 */
_nfs41_proc_fsid_present(struct inode * inode,const struct cred * cred)8006 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8007 {
8008 struct nfs_server *server = NFS_SERVER(inode);
8009 struct rpc_clnt *clnt = server->client;
8010 struct nfs4_fsid_present_arg args = {
8011 .fh = NFS_FH(inode),
8012 };
8013 struct nfs4_fsid_present_res res = {
8014 };
8015 struct rpc_message msg = {
8016 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8017 .rpc_argp = &args,
8018 .rpc_resp = &res,
8019 .rpc_cred = cred,
8020 };
8021 int status;
8022
8023 res.fh = nfs_alloc_fhandle();
8024 if (res.fh == NULL)
8025 return -ENOMEM;
8026
8027 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8028 status = nfs4_call_sync_sequence(clnt, server, &msg,
8029 &args.seq_args, &res.seq_res);
8030 nfs_free_fhandle(res.fh);
8031 if (status == NFS4_OK &&
8032 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8033 status = -NFS4ERR_LEASE_MOVED;
8034 return status;
8035 }
8036
8037 #endif /* CONFIG_NFS_V4_1 */
8038
8039 /**
8040 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8041 * @inode: inode on FSID to check
8042 * @cred: credential to use for this operation
8043 *
8044 * Server indicates whether the FSID is present, moved, or not
8045 * recognized. This operation is necessary to clear a LEASE_MOVED
8046 * condition for this client ID.
8047 *
8048 * Returns NFS4_OK if the FSID is present on this server,
8049 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8050 * NFS4ERR code if some error occurred on the server, or a
8051 * negative errno if a local failure occurred.
8052 */
nfs4_proc_fsid_present(struct inode * inode,const struct cred * cred)8053 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8054 {
8055 struct nfs_server *server = NFS_SERVER(inode);
8056 struct nfs_client *clp = server->nfs_client;
8057 const struct nfs4_mig_recovery_ops *ops =
8058 clp->cl_mvops->mig_recovery_ops;
8059 struct nfs4_exception exception = {
8060 .interruptible = true,
8061 };
8062 int status;
8063
8064 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8065 (unsigned long long)server->fsid.major,
8066 (unsigned long long)server->fsid.minor,
8067 clp->cl_hostname);
8068 nfs_display_fhandle(NFS_FH(inode), __func__);
8069
8070 do {
8071 status = ops->fsid_present(inode, cred);
8072 if (status != -NFS4ERR_DELAY)
8073 break;
8074 nfs4_handle_exception(server, status, &exception);
8075 } while (exception.retry);
8076 return status;
8077 }
8078
8079 /*
8080 * If 'use_integrity' is true and the state managment nfs_client
8081 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8082 * and the machine credential as per RFC3530bis and RFC5661 Security
8083 * Considerations sections. Otherwise, just use the user cred with the
8084 * filesystem's rpc_client.
8085 */
_nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors,bool use_integrity)8086 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8087 {
8088 int status;
8089 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8090 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8091 struct nfs4_secinfo_arg args = {
8092 .dir_fh = NFS_FH(dir),
8093 .name = name,
8094 };
8095 struct nfs4_secinfo_res res = {
8096 .flavors = flavors,
8097 };
8098 struct rpc_message msg = {
8099 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8100 .rpc_argp = &args,
8101 .rpc_resp = &res,
8102 };
8103 struct nfs4_call_sync_data data = {
8104 .seq_server = NFS_SERVER(dir),
8105 .seq_args = &args.seq_args,
8106 .seq_res = &res.seq_res,
8107 };
8108 struct rpc_task_setup task_setup = {
8109 .rpc_client = clnt,
8110 .rpc_message = &msg,
8111 .callback_ops = clp->cl_mvops->call_sync_ops,
8112 .callback_data = &data,
8113 .flags = RPC_TASK_NO_ROUND_ROBIN,
8114 };
8115 const struct cred *cred = NULL;
8116
8117 if (use_integrity) {
8118 clnt = clp->cl_rpcclient;
8119 task_setup.rpc_client = clnt;
8120
8121 cred = nfs4_get_clid_cred(clp);
8122 msg.rpc_cred = cred;
8123 }
8124
8125 dprintk("NFS call secinfo %s\n", name->name);
8126
8127 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8128 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8129 status = nfs4_call_sync_custom(&task_setup);
8130
8131 dprintk("NFS reply secinfo: %d\n", status);
8132
8133 put_cred(cred);
8134 return status;
8135 }
8136
nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors)8137 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8138 struct nfs4_secinfo_flavors *flavors)
8139 {
8140 struct nfs4_exception exception = {
8141 .interruptible = true,
8142 };
8143 int err;
8144 do {
8145 err = -NFS4ERR_WRONGSEC;
8146
8147 /* try to use integrity protection with machine cred */
8148 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8149 err = _nfs4_proc_secinfo(dir, name, flavors, true);
8150
8151 /*
8152 * if unable to use integrity protection, or SECINFO with
8153 * integrity protection returns NFS4ERR_WRONGSEC (which is
8154 * disallowed by spec, but exists in deployed servers) use
8155 * the current filesystem's rpc_client and the user cred.
8156 */
8157 if (err == -NFS4ERR_WRONGSEC)
8158 err = _nfs4_proc_secinfo(dir, name, flavors, false);
8159
8160 trace_nfs4_secinfo(dir, name, err);
8161 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8162 &exception);
8163 } while (exception.retry);
8164 return err;
8165 }
8166
8167 #ifdef CONFIG_NFS_V4_1
8168 /*
8169 * Check the exchange flags returned by the server for invalid flags, having
8170 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8171 * DS flags set.
8172 */
nfs4_check_cl_exchange_flags(u32 flags,u32 version)8173 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8174 {
8175 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8176 goto out_inval;
8177 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8178 goto out_inval;
8179 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8180 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8181 goto out_inval;
8182 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8183 goto out_inval;
8184 return NFS_OK;
8185 out_inval:
8186 return -NFS4ERR_INVAL;
8187 }
8188
8189 static bool
nfs41_same_server_scope(struct nfs41_server_scope * a,struct nfs41_server_scope * b)8190 nfs41_same_server_scope(struct nfs41_server_scope *a,
8191 struct nfs41_server_scope *b)
8192 {
8193 if (a->server_scope_sz != b->server_scope_sz)
8194 return false;
8195 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8196 }
8197
8198 static void
nfs4_bind_one_conn_to_session_done(struct rpc_task * task,void * calldata)8199 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8200 {
8201 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8202 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8203 struct nfs_client *clp = args->client;
8204
8205 switch (task->tk_status) {
8206 case -NFS4ERR_BADSESSION:
8207 case -NFS4ERR_DEADSESSION:
8208 nfs4_schedule_session_recovery(clp->cl_session,
8209 task->tk_status);
8210 }
8211 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8212 res->dir != NFS4_CDFS4_BOTH) {
8213 rpc_task_close_connection(task);
8214 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8215 rpc_restart_call(task);
8216 }
8217 }
8218
8219 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8220 .rpc_call_done = nfs4_bind_one_conn_to_session_done,
8221 };
8222
8223 /*
8224 * nfs4_proc_bind_one_conn_to_session()
8225 *
8226 * The 4.1 client currently uses the same TCP connection for the
8227 * fore and backchannel.
8228 */
8229 static
nfs4_proc_bind_one_conn_to_session(struct rpc_clnt * clnt,struct rpc_xprt * xprt,struct nfs_client * clp,const struct cred * cred)8230 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8231 struct rpc_xprt *xprt,
8232 struct nfs_client *clp,
8233 const struct cred *cred)
8234 {
8235 int status;
8236 struct nfs41_bind_conn_to_session_args args = {
8237 .client = clp,
8238 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8239 .retries = 0,
8240 };
8241 struct nfs41_bind_conn_to_session_res res;
8242 struct rpc_message msg = {
8243 .rpc_proc =
8244 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8245 .rpc_argp = &args,
8246 .rpc_resp = &res,
8247 .rpc_cred = cred,
8248 };
8249 struct rpc_task_setup task_setup_data = {
8250 .rpc_client = clnt,
8251 .rpc_xprt = xprt,
8252 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8253 .rpc_message = &msg,
8254 .flags = RPC_TASK_TIMEOUT,
8255 };
8256 struct rpc_task *task;
8257
8258 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8259 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8260 args.dir = NFS4_CDFC4_FORE;
8261
8262 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8263 if (xprt != rcu_access_pointer(clnt->cl_xprt))
8264 args.dir = NFS4_CDFC4_FORE;
8265
8266 task = rpc_run_task(&task_setup_data);
8267 if (!IS_ERR(task)) {
8268 status = task->tk_status;
8269 rpc_put_task(task);
8270 } else
8271 status = PTR_ERR(task);
8272 trace_nfs4_bind_conn_to_session(clp, status);
8273 if (status == 0) {
8274 if (memcmp(res.sessionid.data,
8275 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8276 dprintk("NFS: %s: Session ID mismatch\n", __func__);
8277 return -EIO;
8278 }
8279 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8280 dprintk("NFS: %s: Unexpected direction from server\n",
8281 __func__);
8282 return -EIO;
8283 }
8284 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8285 dprintk("NFS: %s: Server returned RDMA mode = true\n",
8286 __func__);
8287 return -EIO;
8288 }
8289 }
8290
8291 return status;
8292 }
8293
8294 struct rpc_bind_conn_calldata {
8295 struct nfs_client *clp;
8296 const struct cred *cred;
8297 };
8298
8299 static int
nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * calldata)8300 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8301 struct rpc_xprt *xprt,
8302 void *calldata)
8303 {
8304 struct rpc_bind_conn_calldata *p = calldata;
8305
8306 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8307 }
8308
nfs4_proc_bind_conn_to_session(struct nfs_client * clp,const struct cred * cred)8309 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8310 {
8311 struct rpc_bind_conn_calldata data = {
8312 .clp = clp,
8313 .cred = cred,
8314 };
8315 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8316 nfs4_proc_bind_conn_to_session_callback, &data);
8317 }
8318
8319 /*
8320 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8321 * and operations we'd like to see to enable certain features in the allow map
8322 */
8323 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8324 .how = SP4_MACH_CRED,
8325 .enforce.u.words = {
8326 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8327 1 << (OP_EXCHANGE_ID - 32) |
8328 1 << (OP_CREATE_SESSION - 32) |
8329 1 << (OP_DESTROY_SESSION - 32) |
8330 1 << (OP_DESTROY_CLIENTID - 32)
8331 },
8332 .allow.u.words = {
8333 [0] = 1 << (OP_CLOSE) |
8334 1 << (OP_OPEN_DOWNGRADE) |
8335 1 << (OP_LOCKU) |
8336 1 << (OP_DELEGRETURN) |
8337 1 << (OP_COMMIT),
8338 [1] = 1 << (OP_SECINFO - 32) |
8339 1 << (OP_SECINFO_NO_NAME - 32) |
8340 1 << (OP_LAYOUTRETURN - 32) |
8341 1 << (OP_TEST_STATEID - 32) |
8342 1 << (OP_FREE_STATEID - 32) |
8343 1 << (OP_WRITE - 32)
8344 }
8345 };
8346
8347 /*
8348 * Select the state protection mode for client `clp' given the server results
8349 * from exchange_id in `sp'.
8350 *
8351 * Returns 0 on success, negative errno otherwise.
8352 */
nfs4_sp4_select_mode(struct nfs_client * clp,struct nfs41_state_protection * sp)8353 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8354 struct nfs41_state_protection *sp)
8355 {
8356 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8357 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8358 1 << (OP_EXCHANGE_ID - 32) |
8359 1 << (OP_CREATE_SESSION - 32) |
8360 1 << (OP_DESTROY_SESSION - 32) |
8361 1 << (OP_DESTROY_CLIENTID - 32)
8362 };
8363 unsigned long flags = 0;
8364 unsigned int i;
8365 int ret = 0;
8366
8367 if (sp->how == SP4_MACH_CRED) {
8368 /* Print state protect result */
8369 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8370 for (i = 0; i <= LAST_NFS4_OP; i++) {
8371 if (test_bit(i, sp->enforce.u.longs))
8372 dfprintk(MOUNT, " enforce op %d\n", i);
8373 if (test_bit(i, sp->allow.u.longs))
8374 dfprintk(MOUNT, " allow op %d\n", i);
8375 }
8376
8377 /* make sure nothing is on enforce list that isn't supported */
8378 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8379 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8380 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8381 ret = -EINVAL;
8382 goto out;
8383 }
8384 }
8385
8386 /*
8387 * Minimal mode - state operations are allowed to use machine
8388 * credential. Note this already happens by default, so the
8389 * client doesn't have to do anything more than the negotiation.
8390 *
8391 * NOTE: we don't care if EXCHANGE_ID is in the list -
8392 * we're already using the machine cred for exchange_id
8393 * and will never use a different cred.
8394 */
8395 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8396 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8397 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8398 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8399 dfprintk(MOUNT, "sp4_mach_cred:\n");
8400 dfprintk(MOUNT, " minimal mode enabled\n");
8401 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8402 } else {
8403 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8404 ret = -EINVAL;
8405 goto out;
8406 }
8407
8408 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8409 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8410 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8411 test_bit(OP_LOCKU, sp->allow.u.longs)) {
8412 dfprintk(MOUNT, " cleanup mode enabled\n");
8413 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8414 }
8415
8416 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8417 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
8418 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8419 }
8420
8421 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8422 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8423 dfprintk(MOUNT, " secinfo mode enabled\n");
8424 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8425 }
8426
8427 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8428 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8429 dfprintk(MOUNT, " stateid mode enabled\n");
8430 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8431 }
8432
8433 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8434 dfprintk(MOUNT, " write mode enabled\n");
8435 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8436 }
8437
8438 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8439 dfprintk(MOUNT, " commit mode enabled\n");
8440 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8441 }
8442 }
8443 out:
8444 clp->cl_sp4_flags = flags;
8445 return ret;
8446 }
8447
8448 struct nfs41_exchange_id_data {
8449 struct nfs41_exchange_id_res res;
8450 struct nfs41_exchange_id_args args;
8451 };
8452
nfs4_exchange_id_release(void * data)8453 static void nfs4_exchange_id_release(void *data)
8454 {
8455 struct nfs41_exchange_id_data *cdata =
8456 (struct nfs41_exchange_id_data *)data;
8457
8458 nfs_put_client(cdata->args.client);
8459 kfree(cdata->res.impl_id);
8460 kfree(cdata->res.server_scope);
8461 kfree(cdata->res.server_owner);
8462 kfree(cdata);
8463 }
8464
8465 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8466 .rpc_release = nfs4_exchange_id_release,
8467 };
8468
8469 /*
8470 * _nfs4_proc_exchange_id()
8471 *
8472 * Wrapper for EXCHANGE_ID operation.
8473 */
8474 static struct rpc_task *
nfs4_run_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how,struct rpc_xprt * xprt)8475 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8476 u32 sp4_how, struct rpc_xprt *xprt)
8477 {
8478 struct rpc_message msg = {
8479 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8480 .rpc_cred = cred,
8481 };
8482 struct rpc_task_setup task_setup_data = {
8483 .rpc_client = clp->cl_rpcclient,
8484 .callback_ops = &nfs4_exchange_id_call_ops,
8485 .rpc_message = &msg,
8486 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8487 };
8488 struct nfs41_exchange_id_data *calldata;
8489 int status;
8490
8491 if (!refcount_inc_not_zero(&clp->cl_count))
8492 return ERR_PTR(-EIO);
8493
8494 status = -ENOMEM;
8495 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8496 if (!calldata)
8497 goto out;
8498
8499 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8500
8501 status = nfs4_init_uniform_client_string(clp);
8502 if (status)
8503 goto out_calldata;
8504
8505 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8506 GFP_NOFS);
8507 status = -ENOMEM;
8508 if (unlikely(calldata->res.server_owner == NULL))
8509 goto out_calldata;
8510
8511 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8512 GFP_NOFS);
8513 if (unlikely(calldata->res.server_scope == NULL))
8514 goto out_server_owner;
8515
8516 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8517 if (unlikely(calldata->res.impl_id == NULL))
8518 goto out_server_scope;
8519
8520 switch (sp4_how) {
8521 case SP4_NONE:
8522 calldata->args.state_protect.how = SP4_NONE;
8523 break;
8524
8525 case SP4_MACH_CRED:
8526 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8527 break;
8528
8529 default:
8530 /* unsupported! */
8531 WARN_ON_ONCE(1);
8532 status = -EINVAL;
8533 goto out_impl_id;
8534 }
8535 if (xprt) {
8536 task_setup_data.rpc_xprt = xprt;
8537 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8538 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8539 sizeof(calldata->args.verifier.data));
8540 }
8541 calldata->args.client = clp;
8542 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8543 EXCHGID4_FLAG_BIND_PRINC_STATEID;
8544 #ifdef CONFIG_NFS_V4_1_MIGRATION
8545 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8546 #endif
8547 msg.rpc_argp = &calldata->args;
8548 msg.rpc_resp = &calldata->res;
8549 task_setup_data.callback_data = calldata;
8550
8551 return rpc_run_task(&task_setup_data);
8552
8553 out_impl_id:
8554 kfree(calldata->res.impl_id);
8555 out_server_scope:
8556 kfree(calldata->res.server_scope);
8557 out_server_owner:
8558 kfree(calldata->res.server_owner);
8559 out_calldata:
8560 kfree(calldata);
8561 out:
8562 nfs_put_client(clp);
8563 return ERR_PTR(status);
8564 }
8565
8566 /*
8567 * _nfs4_proc_exchange_id()
8568 *
8569 * Wrapper for EXCHANGE_ID operation.
8570 */
_nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how)8571 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8572 u32 sp4_how)
8573 {
8574 struct rpc_task *task;
8575 struct nfs41_exchange_id_args *argp;
8576 struct nfs41_exchange_id_res *resp;
8577 unsigned long now = jiffies;
8578 int status;
8579
8580 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8581 if (IS_ERR(task))
8582 return PTR_ERR(task);
8583
8584 argp = task->tk_msg.rpc_argp;
8585 resp = task->tk_msg.rpc_resp;
8586 status = task->tk_status;
8587 if (status != 0)
8588 goto out;
8589
8590 status = nfs4_check_cl_exchange_flags(resp->flags,
8591 clp->cl_mvops->minor_version);
8592 if (status != 0)
8593 goto out;
8594
8595 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8596 if (status != 0)
8597 goto out;
8598
8599 do_renew_lease(clp, now);
8600
8601 clp->cl_clientid = resp->clientid;
8602 clp->cl_exchange_flags = resp->flags;
8603 clp->cl_seqid = resp->seqid;
8604 /* Client ID is not confirmed */
8605 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8606 clear_bit(NFS4_SESSION_ESTABLISHED,
8607 &clp->cl_session->session_state);
8608
8609 if (clp->cl_serverscope != NULL &&
8610 !nfs41_same_server_scope(clp->cl_serverscope,
8611 resp->server_scope)) {
8612 dprintk("%s: server_scope mismatch detected\n",
8613 __func__);
8614 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8615 }
8616
8617 swap(clp->cl_serverowner, resp->server_owner);
8618 swap(clp->cl_serverscope, resp->server_scope);
8619 swap(clp->cl_implid, resp->impl_id);
8620
8621 /* Save the EXCHANGE_ID verifier session trunk tests */
8622 memcpy(clp->cl_confirm.data, argp->verifier.data,
8623 sizeof(clp->cl_confirm.data));
8624 out:
8625 trace_nfs4_exchange_id(clp, status);
8626 rpc_put_task(task);
8627 return status;
8628 }
8629
8630 /*
8631 * nfs4_proc_exchange_id()
8632 *
8633 * Returns zero, a negative errno, or a negative NFS4ERR status code.
8634 *
8635 * Since the clientid has expired, all compounds using sessions
8636 * associated with the stale clientid will be returning
8637 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8638 * be in some phase of session reset.
8639 *
8640 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8641 */
nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred)8642 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8643 {
8644 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8645 int status;
8646
8647 /* try SP4_MACH_CRED if krb5i/p */
8648 if (authflavor == RPC_AUTH_GSS_KRB5I ||
8649 authflavor == RPC_AUTH_GSS_KRB5P) {
8650 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8651 if (!status)
8652 return 0;
8653 }
8654
8655 /* try SP4_NONE */
8656 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8657 }
8658
8659 /**
8660 * nfs4_test_session_trunk
8661 *
8662 * This is an add_xprt_test() test function called from
8663 * rpc_clnt_setup_test_and_add_xprt.
8664 *
8665 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8666 * and is dereferrenced in nfs4_exchange_id_release
8667 *
8668 * Upon success, add the new transport to the rpc_clnt
8669 *
8670 * @clnt: struct rpc_clnt to get new transport
8671 * @xprt: the rpc_xprt to test
8672 * @data: call data for _nfs4_proc_exchange_id.
8673 */
nfs4_test_session_trunk(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * data)8674 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8675 void *data)
8676 {
8677 struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8678 struct rpc_task *task;
8679 int status;
8680
8681 u32 sp4_how;
8682
8683 dprintk("--> %s try %s\n", __func__,
8684 xprt->address_strings[RPC_DISPLAY_ADDR]);
8685
8686 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8687
8688 /* Test connection for session trunking. Async exchange_id call */
8689 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8690 if (IS_ERR(task))
8691 return;
8692
8693 status = task->tk_status;
8694 if (status == 0)
8695 status = nfs4_detect_session_trunking(adata->clp,
8696 task->tk_msg.rpc_resp, xprt);
8697
8698 if (status == 0)
8699 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8700
8701 rpc_put_task(task);
8702 }
8703 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8704
_nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)8705 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8706 const struct cred *cred)
8707 {
8708 struct rpc_message msg = {
8709 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8710 .rpc_argp = clp,
8711 .rpc_cred = cred,
8712 };
8713 int status;
8714
8715 status = rpc_call_sync(clp->cl_rpcclient, &msg,
8716 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8717 trace_nfs4_destroy_clientid(clp, status);
8718 if (status)
8719 dprintk("NFS: Got error %d from the server %s on "
8720 "DESTROY_CLIENTID.", status, clp->cl_hostname);
8721 return status;
8722 }
8723
nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)8724 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8725 const struct cred *cred)
8726 {
8727 unsigned int loop;
8728 int ret;
8729
8730 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8731 ret = _nfs4_proc_destroy_clientid(clp, cred);
8732 switch (ret) {
8733 case -NFS4ERR_DELAY:
8734 case -NFS4ERR_CLIENTID_BUSY:
8735 ssleep(1);
8736 break;
8737 default:
8738 return ret;
8739 }
8740 }
8741 return 0;
8742 }
8743
nfs4_destroy_clientid(struct nfs_client * clp)8744 int nfs4_destroy_clientid(struct nfs_client *clp)
8745 {
8746 const struct cred *cred;
8747 int ret = 0;
8748
8749 if (clp->cl_mvops->minor_version < 1)
8750 goto out;
8751 if (clp->cl_exchange_flags == 0)
8752 goto out;
8753 if (clp->cl_preserve_clid)
8754 goto out;
8755 cred = nfs4_get_clid_cred(clp);
8756 ret = nfs4_proc_destroy_clientid(clp, cred);
8757 put_cred(cred);
8758 switch (ret) {
8759 case 0:
8760 case -NFS4ERR_STALE_CLIENTID:
8761 clp->cl_exchange_flags = 0;
8762 }
8763 out:
8764 return ret;
8765 }
8766
8767 #endif /* CONFIG_NFS_V4_1 */
8768
8769 struct nfs4_get_lease_time_data {
8770 struct nfs4_get_lease_time_args *args;
8771 struct nfs4_get_lease_time_res *res;
8772 struct nfs_client *clp;
8773 };
8774
nfs4_get_lease_time_prepare(struct rpc_task * task,void * calldata)8775 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
8776 void *calldata)
8777 {
8778 struct nfs4_get_lease_time_data *data =
8779 (struct nfs4_get_lease_time_data *)calldata;
8780
8781 dprintk("--> %s\n", __func__);
8782 /* just setup sequence, do not trigger session recovery
8783 since we're invoked within one */
8784 nfs4_setup_sequence(data->clp,
8785 &data->args->la_seq_args,
8786 &data->res->lr_seq_res,
8787 task);
8788 dprintk("<-- %s\n", __func__);
8789 }
8790
8791 /*
8792 * Called from nfs4_state_manager thread for session setup, so don't recover
8793 * from sequence operation or clientid errors.
8794 */
nfs4_get_lease_time_done(struct rpc_task * task,void * calldata)8795 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
8796 {
8797 struct nfs4_get_lease_time_data *data =
8798 (struct nfs4_get_lease_time_data *)calldata;
8799
8800 dprintk("--> %s\n", __func__);
8801 if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
8802 return;
8803 switch (task->tk_status) {
8804 case -NFS4ERR_DELAY:
8805 case -NFS4ERR_GRACE:
8806 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
8807 rpc_delay(task, NFS4_POLL_RETRY_MIN);
8808 task->tk_status = 0;
8809 fallthrough;
8810 case -NFS4ERR_RETRY_UNCACHED_REP:
8811 rpc_restart_call_prepare(task);
8812 return;
8813 }
8814 dprintk("<-- %s\n", __func__);
8815 }
8816
8817 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
8818 .rpc_call_prepare = nfs4_get_lease_time_prepare,
8819 .rpc_call_done = nfs4_get_lease_time_done,
8820 };
8821
nfs4_proc_get_lease_time(struct nfs_client * clp,struct nfs_fsinfo * fsinfo)8822 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
8823 {
8824 struct nfs4_get_lease_time_args args;
8825 struct nfs4_get_lease_time_res res = {
8826 .lr_fsinfo = fsinfo,
8827 };
8828 struct nfs4_get_lease_time_data data = {
8829 .args = &args,
8830 .res = &res,
8831 .clp = clp,
8832 };
8833 struct rpc_message msg = {
8834 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
8835 .rpc_argp = &args,
8836 .rpc_resp = &res,
8837 };
8838 struct rpc_task_setup task_setup = {
8839 .rpc_client = clp->cl_rpcclient,
8840 .rpc_message = &msg,
8841 .callback_ops = &nfs4_get_lease_time_ops,
8842 .callback_data = &data,
8843 .flags = RPC_TASK_TIMEOUT,
8844 };
8845
8846 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
8847 return nfs4_call_sync_custom(&task_setup);
8848 }
8849
8850 #ifdef CONFIG_NFS_V4_1
8851
8852 /*
8853 * Initialize the values to be used by the client in CREATE_SESSION
8854 * If nfs4_init_session set the fore channel request and response sizes,
8855 * use them.
8856 *
8857 * Set the back channel max_resp_sz_cached to zero to force the client to
8858 * always set csa_cachethis to FALSE because the current implementation
8859 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
8860 */
nfs4_init_channel_attrs(struct nfs41_create_session_args * args,struct rpc_clnt * clnt)8861 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
8862 struct rpc_clnt *clnt)
8863 {
8864 unsigned int max_rqst_sz, max_resp_sz;
8865 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
8866 unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
8867
8868 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
8869 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
8870
8871 /* Fore channel attributes */
8872 args->fc_attrs.max_rqst_sz = max_rqst_sz;
8873 args->fc_attrs.max_resp_sz = max_resp_sz;
8874 args->fc_attrs.max_ops = NFS4_MAX_OPS;
8875 args->fc_attrs.max_reqs = max_session_slots;
8876
8877 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
8878 "max_ops=%u max_reqs=%u\n",
8879 __func__,
8880 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
8881 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
8882
8883 /* Back channel attributes */
8884 args->bc_attrs.max_rqst_sz = max_bc_payload;
8885 args->bc_attrs.max_resp_sz = max_bc_payload;
8886 args->bc_attrs.max_resp_sz_cached = 0;
8887 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
8888 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
8889 if (args->bc_attrs.max_reqs > max_bc_slots)
8890 args->bc_attrs.max_reqs = max_bc_slots;
8891
8892 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
8893 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
8894 __func__,
8895 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
8896 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
8897 args->bc_attrs.max_reqs);
8898 }
8899
nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)8900 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
8901 struct nfs41_create_session_res *res)
8902 {
8903 struct nfs4_channel_attrs *sent = &args->fc_attrs;
8904 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
8905
8906 if (rcvd->max_resp_sz > sent->max_resp_sz)
8907 return -EINVAL;
8908 /*
8909 * Our requested max_ops is the minimum we need; we're not
8910 * prepared to break up compounds into smaller pieces than that.
8911 * So, no point even trying to continue if the server won't
8912 * cooperate:
8913 */
8914 if (rcvd->max_ops < sent->max_ops)
8915 return -EINVAL;
8916 if (rcvd->max_reqs == 0)
8917 return -EINVAL;
8918 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
8919 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
8920 return 0;
8921 }
8922
nfs4_verify_back_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)8923 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
8924 struct nfs41_create_session_res *res)
8925 {
8926 struct nfs4_channel_attrs *sent = &args->bc_attrs;
8927 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
8928
8929 if (!(res->flags & SESSION4_BACK_CHAN))
8930 goto out;
8931 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
8932 return -EINVAL;
8933 if (rcvd->max_resp_sz < sent->max_resp_sz)
8934 return -EINVAL;
8935 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
8936 return -EINVAL;
8937 if (rcvd->max_ops > sent->max_ops)
8938 return -EINVAL;
8939 if (rcvd->max_reqs > sent->max_reqs)
8940 return -EINVAL;
8941 out:
8942 return 0;
8943 }
8944
nfs4_verify_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)8945 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8946 struct nfs41_create_session_res *res)
8947 {
8948 int ret;
8949
8950 ret = nfs4_verify_fore_channel_attrs(args, res);
8951 if (ret)
8952 return ret;
8953 return nfs4_verify_back_channel_attrs(args, res);
8954 }
8955
nfs4_update_session(struct nfs4_session * session,struct nfs41_create_session_res * res)8956 static void nfs4_update_session(struct nfs4_session *session,
8957 struct nfs41_create_session_res *res)
8958 {
8959 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8960 /* Mark client id and session as being confirmed */
8961 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8962 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8963 session->flags = res->flags;
8964 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8965 if (res->flags & SESSION4_BACK_CHAN)
8966 memcpy(&session->bc_attrs, &res->bc_attrs,
8967 sizeof(session->bc_attrs));
8968 }
8969
_nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)8970 static int _nfs4_proc_create_session(struct nfs_client *clp,
8971 const struct cred *cred)
8972 {
8973 struct nfs4_session *session = clp->cl_session;
8974 struct nfs41_create_session_args args = {
8975 .client = clp,
8976 .clientid = clp->cl_clientid,
8977 .seqid = clp->cl_seqid,
8978 .cb_program = NFS4_CALLBACK,
8979 };
8980 struct nfs41_create_session_res res;
8981
8982 struct rpc_message msg = {
8983 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8984 .rpc_argp = &args,
8985 .rpc_resp = &res,
8986 .rpc_cred = cred,
8987 };
8988 int status;
8989
8990 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8991 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8992
8993 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8994 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8995 trace_nfs4_create_session(clp, status);
8996
8997 switch (status) {
8998 case -NFS4ERR_STALE_CLIENTID:
8999 case -NFS4ERR_DELAY:
9000 case -ETIMEDOUT:
9001 case -EACCES:
9002 case -EAGAIN:
9003 goto out;
9004 }
9005
9006 clp->cl_seqid++;
9007 if (!status) {
9008 /* Verify the session's negotiated channel_attrs values */
9009 status = nfs4_verify_channel_attrs(&args, &res);
9010 /* Increment the clientid slot sequence id */
9011 if (status)
9012 goto out;
9013 nfs4_update_session(session, &res);
9014 }
9015 out:
9016 return status;
9017 }
9018
9019 /*
9020 * Issues a CREATE_SESSION operation to the server.
9021 * It is the responsibility of the caller to verify the session is
9022 * expired before calling this routine.
9023 */
nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9024 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9025 {
9026 int status;
9027 unsigned *ptr;
9028 struct nfs4_session *session = clp->cl_session;
9029
9030 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9031
9032 status = _nfs4_proc_create_session(clp, cred);
9033 if (status)
9034 goto out;
9035
9036 /* Init or reset the session slot tables */
9037 status = nfs4_setup_session_slot_tables(session);
9038 dprintk("slot table setup returned %d\n", status);
9039 if (status)
9040 goto out;
9041
9042 ptr = (unsigned *)&session->sess_id.data[0];
9043 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9044 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9045 out:
9046 dprintk("<-- %s\n", __func__);
9047 return status;
9048 }
9049
9050 /*
9051 * Issue the over-the-wire RPC DESTROY_SESSION.
9052 * The caller must serialize access to this routine.
9053 */
nfs4_proc_destroy_session(struct nfs4_session * session,const struct cred * cred)9054 int nfs4_proc_destroy_session(struct nfs4_session *session,
9055 const struct cred *cred)
9056 {
9057 struct rpc_message msg = {
9058 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9059 .rpc_argp = session,
9060 .rpc_cred = cred,
9061 };
9062 int status = 0;
9063
9064 dprintk("--> nfs4_proc_destroy_session\n");
9065
9066 /* session is still being setup */
9067 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9068 return 0;
9069
9070 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9071 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9072 trace_nfs4_destroy_session(session->clp, status);
9073
9074 if (status)
9075 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9076 "Session has been destroyed regardless...\n", status);
9077
9078 dprintk("<-- nfs4_proc_destroy_session\n");
9079 return status;
9080 }
9081
9082 /*
9083 * Renew the cl_session lease.
9084 */
9085 struct nfs4_sequence_data {
9086 struct nfs_client *clp;
9087 struct nfs4_sequence_args args;
9088 struct nfs4_sequence_res res;
9089 };
9090
nfs41_sequence_release(void * data)9091 static void nfs41_sequence_release(void *data)
9092 {
9093 struct nfs4_sequence_data *calldata = data;
9094 struct nfs_client *clp = calldata->clp;
9095
9096 if (refcount_read(&clp->cl_count) > 1)
9097 nfs4_schedule_state_renewal(clp);
9098 nfs_put_client(clp);
9099 kfree(calldata);
9100 }
9101
nfs41_sequence_handle_errors(struct rpc_task * task,struct nfs_client * clp)9102 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9103 {
9104 switch(task->tk_status) {
9105 case -NFS4ERR_DELAY:
9106 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9107 return -EAGAIN;
9108 default:
9109 nfs4_schedule_lease_recovery(clp);
9110 }
9111 return 0;
9112 }
9113
nfs41_sequence_call_done(struct rpc_task * task,void * data)9114 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9115 {
9116 struct nfs4_sequence_data *calldata = data;
9117 struct nfs_client *clp = calldata->clp;
9118
9119 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9120 return;
9121
9122 trace_nfs4_sequence(clp, task->tk_status);
9123 if (task->tk_status < 0) {
9124 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9125 if (refcount_read(&clp->cl_count) == 1)
9126 goto out;
9127
9128 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9129 rpc_restart_call_prepare(task);
9130 return;
9131 }
9132 }
9133 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9134 out:
9135 dprintk("<-- %s\n", __func__);
9136 }
9137
nfs41_sequence_prepare(struct rpc_task * task,void * data)9138 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9139 {
9140 struct nfs4_sequence_data *calldata = data;
9141 struct nfs_client *clp = calldata->clp;
9142 struct nfs4_sequence_args *args;
9143 struct nfs4_sequence_res *res;
9144
9145 args = task->tk_msg.rpc_argp;
9146 res = task->tk_msg.rpc_resp;
9147
9148 nfs4_setup_sequence(clp, args, res, task);
9149 }
9150
9151 static const struct rpc_call_ops nfs41_sequence_ops = {
9152 .rpc_call_done = nfs41_sequence_call_done,
9153 .rpc_call_prepare = nfs41_sequence_prepare,
9154 .rpc_release = nfs41_sequence_release,
9155 };
9156
_nfs41_proc_sequence(struct nfs_client * clp,const struct cred * cred,struct nfs4_slot * slot,bool is_privileged)9157 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9158 const struct cred *cred,
9159 struct nfs4_slot *slot,
9160 bool is_privileged)
9161 {
9162 struct nfs4_sequence_data *calldata;
9163 struct rpc_message msg = {
9164 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9165 .rpc_cred = cred,
9166 };
9167 struct rpc_task_setup task_setup_data = {
9168 .rpc_client = clp->cl_rpcclient,
9169 .rpc_message = &msg,
9170 .callback_ops = &nfs41_sequence_ops,
9171 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
9172 };
9173 struct rpc_task *ret;
9174
9175 ret = ERR_PTR(-EIO);
9176 if (!refcount_inc_not_zero(&clp->cl_count))
9177 goto out_err;
9178
9179 ret = ERR_PTR(-ENOMEM);
9180 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9181 if (calldata == NULL)
9182 goto out_put_clp;
9183 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9184 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9185 msg.rpc_argp = &calldata->args;
9186 msg.rpc_resp = &calldata->res;
9187 calldata->clp = clp;
9188 task_setup_data.callback_data = calldata;
9189
9190 ret = rpc_run_task(&task_setup_data);
9191 if (IS_ERR(ret))
9192 goto out_err;
9193 return ret;
9194 out_put_clp:
9195 nfs_put_client(clp);
9196 out_err:
9197 nfs41_release_slot(slot);
9198 return ret;
9199 }
9200
nfs41_proc_async_sequence(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)9201 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9202 {
9203 struct rpc_task *task;
9204 int ret = 0;
9205
9206 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9207 return -EAGAIN;
9208 task = _nfs41_proc_sequence(clp, cred, NULL, false);
9209 if (IS_ERR(task))
9210 ret = PTR_ERR(task);
9211 else
9212 rpc_put_task_async(task);
9213 dprintk("<-- %s status=%d\n", __func__, ret);
9214 return ret;
9215 }
9216
nfs4_proc_sequence(struct nfs_client * clp,const struct cred * cred)9217 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9218 {
9219 struct rpc_task *task;
9220 int ret;
9221
9222 task = _nfs41_proc_sequence(clp, cred, NULL, true);
9223 if (IS_ERR(task)) {
9224 ret = PTR_ERR(task);
9225 goto out;
9226 }
9227 ret = rpc_wait_for_completion_task(task);
9228 if (!ret)
9229 ret = task->tk_status;
9230 rpc_put_task(task);
9231 out:
9232 dprintk("<-- %s status=%d\n", __func__, ret);
9233 return ret;
9234 }
9235
9236 struct nfs4_reclaim_complete_data {
9237 struct nfs_client *clp;
9238 struct nfs41_reclaim_complete_args arg;
9239 struct nfs41_reclaim_complete_res res;
9240 };
9241
nfs4_reclaim_complete_prepare(struct rpc_task * task,void * data)9242 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9243 {
9244 struct nfs4_reclaim_complete_data *calldata = data;
9245
9246 nfs4_setup_sequence(calldata->clp,
9247 &calldata->arg.seq_args,
9248 &calldata->res.seq_res,
9249 task);
9250 }
9251
nfs41_reclaim_complete_handle_errors(struct rpc_task * task,struct nfs_client * clp)9252 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9253 {
9254 switch(task->tk_status) {
9255 case 0:
9256 wake_up_all(&clp->cl_lock_waitq);
9257 fallthrough;
9258 case -NFS4ERR_COMPLETE_ALREADY:
9259 case -NFS4ERR_WRONG_CRED: /* What to do here? */
9260 break;
9261 case -NFS4ERR_DELAY:
9262 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9263 fallthrough;
9264 case -NFS4ERR_RETRY_UNCACHED_REP:
9265 return -EAGAIN;
9266 case -NFS4ERR_BADSESSION:
9267 case -NFS4ERR_DEADSESSION:
9268 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9269 break;
9270 default:
9271 nfs4_schedule_lease_recovery(clp);
9272 }
9273 return 0;
9274 }
9275
nfs4_reclaim_complete_done(struct rpc_task * task,void * data)9276 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9277 {
9278 struct nfs4_reclaim_complete_data *calldata = data;
9279 struct nfs_client *clp = calldata->clp;
9280 struct nfs4_sequence_res *res = &calldata->res.seq_res;
9281
9282 dprintk("--> %s\n", __func__);
9283 if (!nfs41_sequence_done(task, res))
9284 return;
9285
9286 trace_nfs4_reclaim_complete(clp, task->tk_status);
9287 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9288 rpc_restart_call_prepare(task);
9289 return;
9290 }
9291 dprintk("<-- %s\n", __func__);
9292 }
9293
nfs4_free_reclaim_complete_data(void * data)9294 static void nfs4_free_reclaim_complete_data(void *data)
9295 {
9296 struct nfs4_reclaim_complete_data *calldata = data;
9297
9298 kfree(calldata);
9299 }
9300
9301 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9302 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9303 .rpc_call_done = nfs4_reclaim_complete_done,
9304 .rpc_release = nfs4_free_reclaim_complete_data,
9305 };
9306
9307 /*
9308 * Issue a global reclaim complete.
9309 */
nfs41_proc_reclaim_complete(struct nfs_client * clp,const struct cred * cred)9310 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9311 const struct cred *cred)
9312 {
9313 struct nfs4_reclaim_complete_data *calldata;
9314 struct rpc_message msg = {
9315 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9316 .rpc_cred = cred,
9317 };
9318 struct rpc_task_setup task_setup_data = {
9319 .rpc_client = clp->cl_rpcclient,
9320 .rpc_message = &msg,
9321 .callback_ops = &nfs4_reclaim_complete_call_ops,
9322 .flags = RPC_TASK_NO_ROUND_ROBIN,
9323 };
9324 int status = -ENOMEM;
9325
9326 dprintk("--> %s\n", __func__);
9327 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9328 if (calldata == NULL)
9329 goto out;
9330 calldata->clp = clp;
9331 calldata->arg.one_fs = 0;
9332
9333 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9334 msg.rpc_argp = &calldata->arg;
9335 msg.rpc_resp = &calldata->res;
9336 task_setup_data.callback_data = calldata;
9337 status = nfs4_call_sync_custom(&task_setup_data);
9338 out:
9339 dprintk("<-- %s status=%d\n", __func__, status);
9340 return status;
9341 }
9342
9343 static void
nfs4_layoutget_prepare(struct rpc_task * task,void * calldata)9344 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9345 {
9346 struct nfs4_layoutget *lgp = calldata;
9347 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9348
9349 dprintk("--> %s\n", __func__);
9350 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9351 &lgp->res.seq_res, task);
9352 dprintk("<-- %s\n", __func__);
9353 }
9354
nfs4_layoutget_done(struct rpc_task * task,void * calldata)9355 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9356 {
9357 struct nfs4_layoutget *lgp = calldata;
9358
9359 dprintk("--> %s\n", __func__);
9360 nfs41_sequence_process(task, &lgp->res.seq_res);
9361 dprintk("<-- %s\n", __func__);
9362 }
9363
9364 static int
nfs4_layoutget_handle_exception(struct rpc_task * task,struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9365 nfs4_layoutget_handle_exception(struct rpc_task *task,
9366 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9367 {
9368 struct inode *inode = lgp->args.inode;
9369 struct nfs_server *server = NFS_SERVER(inode);
9370 struct pnfs_layout_hdr *lo;
9371 int nfs4err = task->tk_status;
9372 int err, status = 0;
9373 LIST_HEAD(head);
9374
9375 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9376
9377 nfs4_sequence_free_slot(&lgp->res.seq_res);
9378
9379 switch (nfs4err) {
9380 case 0:
9381 goto out;
9382
9383 /*
9384 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9385 * on the file. set tk_status to -ENODATA to tell upper layer to
9386 * retry go inband.
9387 */
9388 case -NFS4ERR_LAYOUTUNAVAILABLE:
9389 status = -ENODATA;
9390 goto out;
9391 /*
9392 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9393 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9394 */
9395 case -NFS4ERR_BADLAYOUT:
9396 status = -EOVERFLOW;
9397 goto out;
9398 /*
9399 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9400 * (or clients) writing to the same RAID stripe except when
9401 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9402 *
9403 * Treat it like we would RECALLCONFLICT -- we retry for a little
9404 * while, and then eventually give up.
9405 */
9406 case -NFS4ERR_LAYOUTTRYLATER:
9407 if (lgp->args.minlength == 0) {
9408 status = -EOVERFLOW;
9409 goto out;
9410 }
9411 status = -EBUSY;
9412 break;
9413 case -NFS4ERR_RECALLCONFLICT:
9414 status = -ERECALLCONFLICT;
9415 break;
9416 case -NFS4ERR_DELEG_REVOKED:
9417 case -NFS4ERR_ADMIN_REVOKED:
9418 case -NFS4ERR_EXPIRED:
9419 case -NFS4ERR_BAD_STATEID:
9420 exception->timeout = 0;
9421 spin_lock(&inode->i_lock);
9422 lo = NFS_I(inode)->layout;
9423 /* If the open stateid was bad, then recover it. */
9424 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9425 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9426 spin_unlock(&inode->i_lock);
9427 exception->state = lgp->args.ctx->state;
9428 exception->stateid = &lgp->args.stateid;
9429 break;
9430 }
9431
9432 /*
9433 * Mark the bad layout state as invalid, then retry
9434 */
9435 pnfs_mark_layout_stateid_invalid(lo, &head);
9436 spin_unlock(&inode->i_lock);
9437 nfs_commit_inode(inode, 0);
9438 pnfs_free_lseg_list(&head);
9439 status = -EAGAIN;
9440 goto out;
9441 }
9442
9443 err = nfs4_handle_exception(server, nfs4err, exception);
9444 if (!status) {
9445 if (exception->retry)
9446 status = -EAGAIN;
9447 else
9448 status = err;
9449 }
9450 out:
9451 dprintk("<-- %s\n", __func__);
9452 return status;
9453 }
9454
max_response_pages(struct nfs_server * server)9455 size_t max_response_pages(struct nfs_server *server)
9456 {
9457 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9458 return nfs_page_array_len(0, max_resp_sz);
9459 }
9460
nfs4_layoutget_release(void * calldata)9461 static void nfs4_layoutget_release(void *calldata)
9462 {
9463 struct nfs4_layoutget *lgp = calldata;
9464
9465 dprintk("--> %s\n", __func__);
9466 nfs4_sequence_free_slot(&lgp->res.seq_res);
9467 pnfs_layoutget_free(lgp);
9468 dprintk("<-- %s\n", __func__);
9469 }
9470
9471 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9472 .rpc_call_prepare = nfs4_layoutget_prepare,
9473 .rpc_call_done = nfs4_layoutget_done,
9474 .rpc_release = nfs4_layoutget_release,
9475 };
9476
9477 struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget * lgp,long * timeout)9478 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9479 {
9480 struct inode *inode = lgp->args.inode;
9481 struct nfs_server *server = NFS_SERVER(inode);
9482 struct rpc_task *task;
9483 struct rpc_message msg = {
9484 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9485 .rpc_argp = &lgp->args,
9486 .rpc_resp = &lgp->res,
9487 .rpc_cred = lgp->cred,
9488 };
9489 struct rpc_task_setup task_setup_data = {
9490 .rpc_client = server->client,
9491 .rpc_message = &msg,
9492 .callback_ops = &nfs4_layoutget_call_ops,
9493 .callback_data = lgp,
9494 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
9495 };
9496 struct pnfs_layout_segment *lseg = NULL;
9497 struct nfs4_exception exception = {
9498 .inode = inode,
9499 .timeout = *timeout,
9500 };
9501 int status = 0;
9502
9503 dprintk("--> %s\n", __func__);
9504
9505 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
9506 pnfs_get_layout_hdr(NFS_I(inode)->layout);
9507
9508 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9509
9510 task = rpc_run_task(&task_setup_data);
9511
9512 status = rpc_wait_for_completion_task(task);
9513 if (status != 0)
9514 goto out;
9515
9516 if (task->tk_status < 0) {
9517 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9518 *timeout = exception.timeout;
9519 } else if (lgp->res.layoutp->len == 0) {
9520 status = -EAGAIN;
9521 *timeout = nfs4_update_delay(&exception.timeout);
9522 } else
9523 lseg = pnfs_layout_process(lgp);
9524 out:
9525 trace_nfs4_layoutget(lgp->args.ctx,
9526 &lgp->args.range,
9527 &lgp->res.range,
9528 &lgp->res.stateid,
9529 status);
9530
9531 rpc_put_task(task);
9532 dprintk("<-- %s status=%d\n", __func__, status);
9533 if (status)
9534 return ERR_PTR(status);
9535 return lseg;
9536 }
9537
9538 static void
nfs4_layoutreturn_prepare(struct rpc_task * task,void * calldata)9539 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9540 {
9541 struct nfs4_layoutreturn *lrp = calldata;
9542
9543 dprintk("--> %s\n", __func__);
9544 nfs4_setup_sequence(lrp->clp,
9545 &lrp->args.seq_args,
9546 &lrp->res.seq_res,
9547 task);
9548 if (!pnfs_layout_is_valid(lrp->args.layout))
9549 rpc_exit(task, 0);
9550 }
9551
nfs4_layoutreturn_done(struct rpc_task * task,void * calldata)9552 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9553 {
9554 struct nfs4_layoutreturn *lrp = calldata;
9555 struct nfs_server *server;
9556
9557 dprintk("--> %s\n", __func__);
9558
9559 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9560 return;
9561
9562 /*
9563 * Was there an RPC level error? Assume the call succeeded,
9564 * and that we need to release the layout
9565 */
9566 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9567 lrp->res.lrs_present = 0;
9568 return;
9569 }
9570
9571 server = NFS_SERVER(lrp->args.inode);
9572 switch (task->tk_status) {
9573 case -NFS4ERR_OLD_STATEID:
9574 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9575 &lrp->args.range,
9576 lrp->args.inode))
9577 goto out_restart;
9578 fallthrough;
9579 default:
9580 task->tk_status = 0;
9581 fallthrough;
9582 case 0:
9583 break;
9584 case -NFS4ERR_DELAY:
9585 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9586 break;
9587 goto out_restart;
9588 }
9589 dprintk("<-- %s\n", __func__);
9590 return;
9591 out_restart:
9592 task->tk_status = 0;
9593 nfs4_sequence_free_slot(&lrp->res.seq_res);
9594 rpc_restart_call_prepare(task);
9595 }
9596
nfs4_layoutreturn_release(void * calldata)9597 static void nfs4_layoutreturn_release(void *calldata)
9598 {
9599 struct nfs4_layoutreturn *lrp = calldata;
9600 struct pnfs_layout_hdr *lo = lrp->args.layout;
9601
9602 dprintk("--> %s\n", __func__);
9603 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9604 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9605 nfs4_sequence_free_slot(&lrp->res.seq_res);
9606 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9607 lrp->ld_private.ops->free(&lrp->ld_private);
9608 pnfs_put_layout_hdr(lrp->args.layout);
9609 nfs_iput_and_deactive(lrp->inode);
9610 put_cred(lrp->cred);
9611 kfree(calldata);
9612 dprintk("<-- %s\n", __func__);
9613 }
9614
9615 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9616 .rpc_call_prepare = nfs4_layoutreturn_prepare,
9617 .rpc_call_done = nfs4_layoutreturn_done,
9618 .rpc_release = nfs4_layoutreturn_release,
9619 };
9620
nfs4_proc_layoutreturn(struct nfs4_layoutreturn * lrp,bool sync)9621 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9622 {
9623 struct rpc_task *task;
9624 struct rpc_message msg = {
9625 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9626 .rpc_argp = &lrp->args,
9627 .rpc_resp = &lrp->res,
9628 .rpc_cred = lrp->cred,
9629 };
9630 struct rpc_task_setup task_setup_data = {
9631 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9632 .rpc_message = &msg,
9633 .callback_ops = &nfs4_layoutreturn_call_ops,
9634 .callback_data = lrp,
9635 };
9636 int status = 0;
9637
9638 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9639 NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9640 &task_setup_data.rpc_client, &msg);
9641
9642 dprintk("--> %s\n", __func__);
9643 if (!sync) {
9644 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9645 if (!lrp->inode) {
9646 nfs4_layoutreturn_release(lrp);
9647 return -EAGAIN;
9648 }
9649 task_setup_data.flags |= RPC_TASK_ASYNC;
9650 }
9651 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
9652 task = rpc_run_task(&task_setup_data);
9653 if (IS_ERR(task))
9654 return PTR_ERR(task);
9655 if (sync)
9656 status = task->tk_status;
9657 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9658 dprintk("<-- %s status=%d\n", __func__, status);
9659 rpc_put_task(task);
9660 return status;
9661 }
9662
9663 static int
_nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9664 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9665 struct pnfs_device *pdev,
9666 const struct cred *cred)
9667 {
9668 struct nfs4_getdeviceinfo_args args = {
9669 .pdev = pdev,
9670 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9671 NOTIFY_DEVICEID4_DELETE,
9672 };
9673 struct nfs4_getdeviceinfo_res res = {
9674 .pdev = pdev,
9675 };
9676 struct rpc_message msg = {
9677 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9678 .rpc_argp = &args,
9679 .rpc_resp = &res,
9680 .rpc_cred = cred,
9681 };
9682 int status;
9683
9684 dprintk("--> %s\n", __func__);
9685 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9686 if (res.notification & ~args.notify_types)
9687 dprintk("%s: unsupported notification\n", __func__);
9688 if (res.notification != args.notify_types)
9689 pdev->nocache = 1;
9690
9691 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9692
9693 dprintk("<-- %s status=%d\n", __func__, status);
9694
9695 return status;
9696 }
9697
nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9698 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9699 struct pnfs_device *pdev,
9700 const struct cred *cred)
9701 {
9702 struct nfs4_exception exception = { };
9703 int err;
9704
9705 do {
9706 err = nfs4_handle_exception(server,
9707 _nfs4_proc_getdeviceinfo(server, pdev, cred),
9708 &exception);
9709 } while (exception.retry);
9710 return err;
9711 }
9712 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9713
nfs4_layoutcommit_prepare(struct rpc_task * task,void * calldata)9714 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9715 {
9716 struct nfs4_layoutcommit_data *data = calldata;
9717 struct nfs_server *server = NFS_SERVER(data->args.inode);
9718
9719 nfs4_setup_sequence(server->nfs_client,
9720 &data->args.seq_args,
9721 &data->res.seq_res,
9722 task);
9723 }
9724
9725 static void
nfs4_layoutcommit_done(struct rpc_task * task,void * calldata)9726 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9727 {
9728 struct nfs4_layoutcommit_data *data = calldata;
9729 struct nfs_server *server = NFS_SERVER(data->args.inode);
9730
9731 if (!nfs41_sequence_done(task, &data->res.seq_res))
9732 return;
9733
9734 switch (task->tk_status) { /* Just ignore these failures */
9735 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9736 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
9737 case -NFS4ERR_BADLAYOUT: /* no layout */
9738 case -NFS4ERR_GRACE: /* loca_recalim always false */
9739 task->tk_status = 0;
9740 break;
9741 case 0:
9742 break;
9743 default:
9744 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9745 rpc_restart_call_prepare(task);
9746 return;
9747 }
9748 }
9749 }
9750
nfs4_layoutcommit_release(void * calldata)9751 static void nfs4_layoutcommit_release(void *calldata)
9752 {
9753 struct nfs4_layoutcommit_data *data = calldata;
9754
9755 pnfs_cleanup_layoutcommit(data);
9756 nfs_post_op_update_inode_force_wcc(data->args.inode,
9757 data->res.fattr);
9758 put_cred(data->cred);
9759 nfs_iput_and_deactive(data->inode);
9760 kfree(data);
9761 }
9762
9763 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9764 .rpc_call_prepare = nfs4_layoutcommit_prepare,
9765 .rpc_call_done = nfs4_layoutcommit_done,
9766 .rpc_release = nfs4_layoutcommit_release,
9767 };
9768
9769 int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data * data,bool sync)9770 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9771 {
9772 struct rpc_message msg = {
9773 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9774 .rpc_argp = &data->args,
9775 .rpc_resp = &data->res,
9776 .rpc_cred = data->cred,
9777 };
9778 struct rpc_task_setup task_setup_data = {
9779 .task = &data->task,
9780 .rpc_client = NFS_CLIENT(data->args.inode),
9781 .rpc_message = &msg,
9782 .callback_ops = &nfs4_layoutcommit_ops,
9783 .callback_data = data,
9784 };
9785 struct rpc_task *task;
9786 int status = 0;
9787
9788 dprintk("NFS: initiating layoutcommit call. sync %d "
9789 "lbw: %llu inode %lu\n", sync,
9790 data->args.lastbytewritten,
9791 data->args.inode->i_ino);
9792
9793 if (!sync) {
9794 data->inode = nfs_igrab_and_active(data->args.inode);
9795 if (data->inode == NULL) {
9796 nfs4_layoutcommit_release(data);
9797 return -EAGAIN;
9798 }
9799 task_setup_data.flags = RPC_TASK_ASYNC;
9800 }
9801 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
9802 task = rpc_run_task(&task_setup_data);
9803 if (IS_ERR(task))
9804 return PTR_ERR(task);
9805 if (sync)
9806 status = task->tk_status;
9807 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
9808 dprintk("%s: status %d\n", __func__, status);
9809 rpc_put_task(task);
9810 return status;
9811 }
9812
9813 /*
9814 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
9815 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
9816 */
9817 static int
_nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors,bool use_integrity)9818 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9819 struct nfs_fsinfo *info,
9820 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
9821 {
9822 struct nfs41_secinfo_no_name_args args = {
9823 .style = SECINFO_STYLE_CURRENT_FH,
9824 };
9825 struct nfs4_secinfo_res res = {
9826 .flavors = flavors,
9827 };
9828 struct rpc_message msg = {
9829 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
9830 .rpc_argp = &args,
9831 .rpc_resp = &res,
9832 };
9833 struct nfs4_call_sync_data data = {
9834 .seq_server = server,
9835 .seq_args = &args.seq_args,
9836 .seq_res = &res.seq_res,
9837 };
9838 struct rpc_task_setup task_setup = {
9839 .rpc_client = server->client,
9840 .rpc_message = &msg,
9841 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
9842 .callback_data = &data,
9843 .flags = RPC_TASK_NO_ROUND_ROBIN,
9844 };
9845 const struct cred *cred = NULL;
9846 int status;
9847
9848 if (use_integrity) {
9849 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
9850
9851 cred = nfs4_get_clid_cred(server->nfs_client);
9852 msg.rpc_cred = cred;
9853 }
9854
9855 dprintk("--> %s\n", __func__);
9856 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
9857 status = nfs4_call_sync_custom(&task_setup);
9858 dprintk("<-- %s status=%d\n", __func__, status);
9859
9860 put_cred(cred);
9861
9862 return status;
9863 }
9864
9865 static int
nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors)9866 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9867 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
9868 {
9869 struct nfs4_exception exception = {
9870 .interruptible = true,
9871 };
9872 int err;
9873 do {
9874 /* first try using integrity protection */
9875 err = -NFS4ERR_WRONGSEC;
9876
9877 /* try to use integrity protection with machine cred */
9878 if (_nfs4_is_integrity_protected(server->nfs_client))
9879 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9880 flavors, true);
9881
9882 /*
9883 * if unable to use integrity protection, or SECINFO with
9884 * integrity protection returns NFS4ERR_WRONGSEC (which is
9885 * disallowed by spec, but exists in deployed servers) use
9886 * the current filesystem's rpc_client and the user cred.
9887 */
9888 if (err == -NFS4ERR_WRONGSEC)
9889 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9890 flavors, false);
9891
9892 switch (err) {
9893 case 0:
9894 case -NFS4ERR_WRONGSEC:
9895 case -ENOTSUPP:
9896 goto out;
9897 default:
9898 err = nfs4_handle_exception(server, err, &exception);
9899 }
9900 } while (exception.retry);
9901 out:
9902 return err;
9903 }
9904
9905 static int
nfs41_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)9906 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
9907 struct nfs_fsinfo *info)
9908 {
9909 int err;
9910 struct page *page;
9911 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9912 struct nfs4_secinfo_flavors *flavors;
9913 struct nfs4_secinfo4 *secinfo;
9914 int i;
9915
9916 page = alloc_page(GFP_KERNEL);
9917 if (!page) {
9918 err = -ENOMEM;
9919 goto out;
9920 }
9921
9922 flavors = page_address(page);
9923 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
9924
9925 /*
9926 * Fall back on "guess and check" method if
9927 * the server doesn't support SECINFO_NO_NAME
9928 */
9929 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
9930 err = nfs4_find_root_sec(server, fhandle, info);
9931 goto out_freepage;
9932 }
9933 if (err)
9934 goto out_freepage;
9935
9936 for (i = 0; i < flavors->num_flavors; i++) {
9937 secinfo = &flavors->flavors[i];
9938
9939 switch (secinfo->flavor) {
9940 case RPC_AUTH_NULL:
9941 case RPC_AUTH_UNIX:
9942 case RPC_AUTH_GSS:
9943 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9944 &secinfo->flavor_info);
9945 break;
9946 default:
9947 flavor = RPC_AUTH_MAXFLAVOR;
9948 break;
9949 }
9950
9951 if (!nfs_auth_info_match(&server->auth_info, flavor))
9952 flavor = RPC_AUTH_MAXFLAVOR;
9953
9954 if (flavor != RPC_AUTH_MAXFLAVOR) {
9955 err = nfs4_lookup_root_sec(server, fhandle,
9956 info, flavor);
9957 if (!err)
9958 break;
9959 }
9960 }
9961
9962 if (flavor == RPC_AUTH_MAXFLAVOR)
9963 err = -EPERM;
9964
9965 out_freepage:
9966 put_page(page);
9967 if (err == -EACCES)
9968 return -EPERM;
9969 out:
9970 return err;
9971 }
9972
_nfs41_test_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)9973 static int _nfs41_test_stateid(struct nfs_server *server,
9974 nfs4_stateid *stateid,
9975 const struct cred *cred)
9976 {
9977 int status;
9978 struct nfs41_test_stateid_args args = {
9979 .stateid = stateid,
9980 };
9981 struct nfs41_test_stateid_res res;
9982 struct rpc_message msg = {
9983 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9984 .rpc_argp = &args,
9985 .rpc_resp = &res,
9986 .rpc_cred = cred,
9987 };
9988 struct rpc_clnt *rpc_client = server->client;
9989
9990 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9991 &rpc_client, &msg);
9992
9993 dprintk("NFS call test_stateid %p\n", stateid);
9994 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
9995 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9996 &args.seq_args, &res.seq_res);
9997 if (status != NFS_OK) {
9998 dprintk("NFS reply test_stateid: failed, %d\n", status);
9999 return status;
10000 }
10001 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10002 return -res.status;
10003 }
10004
nfs4_handle_delay_or_session_error(struct nfs_server * server,int err,struct nfs4_exception * exception)10005 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10006 int err, struct nfs4_exception *exception)
10007 {
10008 exception->retry = 0;
10009 switch(err) {
10010 case -NFS4ERR_DELAY:
10011 case -NFS4ERR_RETRY_UNCACHED_REP:
10012 nfs4_handle_exception(server, err, exception);
10013 break;
10014 case -NFS4ERR_BADSESSION:
10015 case -NFS4ERR_BADSLOT:
10016 case -NFS4ERR_BAD_HIGH_SLOT:
10017 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10018 case -NFS4ERR_DEADSESSION:
10019 nfs4_do_handle_exception(server, err, exception);
10020 }
10021 }
10022
10023 /**
10024 * nfs41_test_stateid - perform a TEST_STATEID operation
10025 *
10026 * @server: server / transport on which to perform the operation
10027 * @stateid: state ID to test
10028 * @cred: credential
10029 *
10030 * Returns NFS_OK if the server recognizes that "stateid" is valid.
10031 * Otherwise a negative NFS4ERR value is returned if the operation
10032 * failed or the state ID is not currently valid.
10033 */
nfs41_test_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)10034 static int nfs41_test_stateid(struct nfs_server *server,
10035 nfs4_stateid *stateid,
10036 const struct cred *cred)
10037 {
10038 struct nfs4_exception exception = {
10039 .interruptible = true,
10040 };
10041 int err;
10042 do {
10043 err = _nfs41_test_stateid(server, stateid, cred);
10044 nfs4_handle_delay_or_session_error(server, err, &exception);
10045 } while (exception.retry);
10046 return err;
10047 }
10048
10049 struct nfs_free_stateid_data {
10050 struct nfs_server *server;
10051 struct nfs41_free_stateid_args args;
10052 struct nfs41_free_stateid_res res;
10053 };
10054
nfs41_free_stateid_prepare(struct rpc_task * task,void * calldata)10055 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10056 {
10057 struct nfs_free_stateid_data *data = calldata;
10058 nfs4_setup_sequence(data->server->nfs_client,
10059 &data->args.seq_args,
10060 &data->res.seq_res,
10061 task);
10062 }
10063
nfs41_free_stateid_done(struct rpc_task * task,void * calldata)10064 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10065 {
10066 struct nfs_free_stateid_data *data = calldata;
10067
10068 nfs41_sequence_done(task, &data->res.seq_res);
10069
10070 switch (task->tk_status) {
10071 case -NFS4ERR_DELAY:
10072 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10073 rpc_restart_call_prepare(task);
10074 }
10075 }
10076
nfs41_free_stateid_release(void * calldata)10077 static void nfs41_free_stateid_release(void *calldata)
10078 {
10079 kfree(calldata);
10080 }
10081
10082 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10083 .rpc_call_prepare = nfs41_free_stateid_prepare,
10084 .rpc_call_done = nfs41_free_stateid_done,
10085 .rpc_release = nfs41_free_stateid_release,
10086 };
10087
10088 /**
10089 * nfs41_free_stateid - perform a FREE_STATEID operation
10090 *
10091 * @server: server / transport on which to perform the operation
10092 * @stateid: state ID to release
10093 * @cred: credential
10094 * @privileged: set to true if this call needs to be privileged
10095 *
10096 * Note: this function is always asynchronous.
10097 */
nfs41_free_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred,bool privileged)10098 static int nfs41_free_stateid(struct nfs_server *server,
10099 const nfs4_stateid *stateid,
10100 const struct cred *cred,
10101 bool privileged)
10102 {
10103 struct rpc_message msg = {
10104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10105 .rpc_cred = cred,
10106 };
10107 struct rpc_task_setup task_setup = {
10108 .rpc_client = server->client,
10109 .rpc_message = &msg,
10110 .callback_ops = &nfs41_free_stateid_ops,
10111 .flags = RPC_TASK_ASYNC,
10112 };
10113 struct nfs_free_stateid_data *data;
10114 struct rpc_task *task;
10115
10116 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10117 &task_setup.rpc_client, &msg);
10118
10119 dprintk("NFS call free_stateid %p\n", stateid);
10120 data = kmalloc(sizeof(*data), GFP_NOFS);
10121 if (!data)
10122 return -ENOMEM;
10123 data->server = server;
10124 nfs4_stateid_copy(&data->args.stateid, stateid);
10125
10126 task_setup.callback_data = data;
10127
10128 msg.rpc_argp = &data->args;
10129 msg.rpc_resp = &data->res;
10130 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10131 task = rpc_run_task(&task_setup);
10132 if (IS_ERR(task))
10133 return PTR_ERR(task);
10134 rpc_put_task(task);
10135 return 0;
10136 }
10137
10138 static void
nfs41_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)10139 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10140 {
10141 const struct cred *cred = lsp->ls_state->owner->so_cred;
10142
10143 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10144 nfs4_free_lock_state(server, lsp);
10145 }
10146
nfs41_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10147 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10148 const nfs4_stateid *s2)
10149 {
10150 if (s1->type != s2->type)
10151 return false;
10152
10153 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10154 return false;
10155
10156 if (s1->seqid == s2->seqid)
10157 return true;
10158
10159 return s1->seqid == 0 || s2->seqid == 0;
10160 }
10161
10162 #endif /* CONFIG_NFS_V4_1 */
10163
nfs4_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10164 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10165 const nfs4_stateid *s2)
10166 {
10167 return nfs4_stateid_match(s1, s2);
10168 }
10169
10170
10171 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10172 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10173 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10174 .recover_open = nfs4_open_reclaim,
10175 .recover_lock = nfs4_lock_reclaim,
10176 .establish_clid = nfs4_init_clientid,
10177 .detect_trunking = nfs40_discover_server_trunking,
10178 };
10179
10180 #if defined(CONFIG_NFS_V4_1)
10181 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10182 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10183 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10184 .recover_open = nfs4_open_reclaim,
10185 .recover_lock = nfs4_lock_reclaim,
10186 .establish_clid = nfs41_init_clientid,
10187 .reclaim_complete = nfs41_proc_reclaim_complete,
10188 .detect_trunking = nfs41_discover_server_trunking,
10189 };
10190 #endif /* CONFIG_NFS_V4_1 */
10191
10192 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10193 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10194 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10195 .recover_open = nfs40_open_expired,
10196 .recover_lock = nfs4_lock_expired,
10197 .establish_clid = nfs4_init_clientid,
10198 };
10199
10200 #if defined(CONFIG_NFS_V4_1)
10201 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10202 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10203 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10204 .recover_open = nfs41_open_expired,
10205 .recover_lock = nfs41_lock_expired,
10206 .establish_clid = nfs41_init_clientid,
10207 };
10208 #endif /* CONFIG_NFS_V4_1 */
10209
10210 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10211 .sched_state_renewal = nfs4_proc_async_renew,
10212 .get_state_renewal_cred = nfs4_get_renew_cred,
10213 .renew_lease = nfs4_proc_renew,
10214 };
10215
10216 #if defined(CONFIG_NFS_V4_1)
10217 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10218 .sched_state_renewal = nfs41_proc_async_sequence,
10219 .get_state_renewal_cred = nfs4_get_machine_cred,
10220 .renew_lease = nfs4_proc_sequence,
10221 };
10222 #endif
10223
10224 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10225 .get_locations = _nfs40_proc_get_locations,
10226 .fsid_present = _nfs40_proc_fsid_present,
10227 };
10228
10229 #if defined(CONFIG_NFS_V4_1)
10230 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10231 .get_locations = _nfs41_proc_get_locations,
10232 .fsid_present = _nfs41_proc_fsid_present,
10233 };
10234 #endif /* CONFIG_NFS_V4_1 */
10235
10236 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10237 .minor_version = 0,
10238 .init_caps = NFS_CAP_READDIRPLUS
10239 | NFS_CAP_ATOMIC_OPEN
10240 | NFS_CAP_POSIX_LOCK,
10241 .init_client = nfs40_init_client,
10242 .shutdown_client = nfs40_shutdown_client,
10243 .match_stateid = nfs4_match_stateid,
10244 .find_root_sec = nfs4_find_root_sec,
10245 .free_lock_state = nfs4_release_lockowner,
10246 .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10247 .alloc_seqid = nfs_alloc_seqid,
10248 .call_sync_ops = &nfs40_call_sync_ops,
10249 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10250 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10251 .state_renewal_ops = &nfs40_state_renewal_ops,
10252 .mig_recovery_ops = &nfs40_mig_recovery_ops,
10253 };
10254
10255 #if defined(CONFIG_NFS_V4_1)
10256 static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter * arg1,gfp_t arg2)10257 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10258 {
10259 return NULL;
10260 }
10261
10262 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10263 .minor_version = 1,
10264 .init_caps = NFS_CAP_READDIRPLUS
10265 | NFS_CAP_ATOMIC_OPEN
10266 | NFS_CAP_POSIX_LOCK
10267 | NFS_CAP_STATEID_NFSV41
10268 | NFS_CAP_ATOMIC_OPEN_V1
10269 | NFS_CAP_LGOPEN,
10270 .init_client = nfs41_init_client,
10271 .shutdown_client = nfs41_shutdown_client,
10272 .match_stateid = nfs41_match_stateid,
10273 .find_root_sec = nfs41_find_root_sec,
10274 .free_lock_state = nfs41_free_lock_state,
10275 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10276 .alloc_seqid = nfs_alloc_no_seqid,
10277 .session_trunk = nfs4_test_session_trunk,
10278 .call_sync_ops = &nfs41_call_sync_ops,
10279 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10280 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10281 .state_renewal_ops = &nfs41_state_renewal_ops,
10282 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10283 };
10284 #endif
10285
10286 #if defined(CONFIG_NFS_V4_2)
10287 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10288 .minor_version = 2,
10289 .init_caps = NFS_CAP_READDIRPLUS
10290 | NFS_CAP_ATOMIC_OPEN
10291 | NFS_CAP_POSIX_LOCK
10292 | NFS_CAP_STATEID_NFSV41
10293 | NFS_CAP_ATOMIC_OPEN_V1
10294 | NFS_CAP_LGOPEN
10295 | NFS_CAP_ALLOCATE
10296 | NFS_CAP_COPY
10297 | NFS_CAP_OFFLOAD_CANCEL
10298 | NFS_CAP_COPY_NOTIFY
10299 | NFS_CAP_DEALLOCATE
10300 | NFS_CAP_SEEK
10301 | NFS_CAP_LAYOUTSTATS
10302 | NFS_CAP_CLONE
10303 | NFS_CAP_LAYOUTERROR
10304 | NFS_CAP_READ_PLUS,
10305 .init_client = nfs41_init_client,
10306 .shutdown_client = nfs41_shutdown_client,
10307 .match_stateid = nfs41_match_stateid,
10308 .find_root_sec = nfs41_find_root_sec,
10309 .free_lock_state = nfs41_free_lock_state,
10310 .call_sync_ops = &nfs41_call_sync_ops,
10311 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10312 .alloc_seqid = nfs_alloc_no_seqid,
10313 .session_trunk = nfs4_test_session_trunk,
10314 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10315 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10316 .state_renewal_ops = &nfs41_state_renewal_ops,
10317 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10318 };
10319 #endif
10320
10321 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10322 [0] = &nfs_v4_0_minor_ops,
10323 #if defined(CONFIG_NFS_V4_1)
10324 [1] = &nfs_v4_1_minor_ops,
10325 #endif
10326 #if defined(CONFIG_NFS_V4_2)
10327 [2] = &nfs_v4_2_minor_ops,
10328 #endif
10329 };
10330
nfs4_listxattr(struct dentry * dentry,char * list,size_t size)10331 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10332 {
10333 ssize_t error, error2, error3;
10334
10335 error = generic_listxattr(dentry, list, size);
10336 if (error < 0)
10337 return error;
10338 if (list) {
10339 list += error;
10340 size -= error;
10341 }
10342
10343 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10344 if (error2 < 0)
10345 return error2;
10346
10347 if (list) {
10348 list += error2;
10349 size -= error2;
10350 }
10351
10352 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10353 if (error3 < 0)
10354 return error3;
10355
10356 return error + error2 + error3;
10357 }
10358
10359 static const struct inode_operations nfs4_dir_inode_operations = {
10360 .create = nfs_create,
10361 .lookup = nfs_lookup,
10362 .atomic_open = nfs_atomic_open,
10363 .link = nfs_link,
10364 .unlink = nfs_unlink,
10365 .symlink = nfs_symlink,
10366 .mkdir = nfs_mkdir,
10367 .rmdir = nfs_rmdir,
10368 .mknod = nfs_mknod,
10369 .rename = nfs_rename,
10370 .permission = nfs_permission,
10371 .getattr = nfs_getattr,
10372 .setattr = nfs_setattr,
10373 .listxattr = nfs4_listxattr,
10374 };
10375
10376 static const struct inode_operations nfs4_file_inode_operations = {
10377 .permission = nfs_permission,
10378 .getattr = nfs_getattr,
10379 .setattr = nfs_setattr,
10380 .listxattr = nfs4_listxattr,
10381 };
10382
10383 const struct nfs_rpc_ops nfs_v4_clientops = {
10384 .version = 4, /* protocol version */
10385 .dentry_ops = &nfs4_dentry_operations,
10386 .dir_inode_ops = &nfs4_dir_inode_operations,
10387 .file_inode_ops = &nfs4_file_inode_operations,
10388 .file_ops = &nfs4_file_operations,
10389 .getroot = nfs4_proc_get_root,
10390 .submount = nfs4_submount,
10391 .try_get_tree = nfs4_try_get_tree,
10392 .getattr = nfs4_proc_getattr,
10393 .setattr = nfs4_proc_setattr,
10394 .lookup = nfs4_proc_lookup,
10395 .lookupp = nfs4_proc_lookupp,
10396 .access = nfs4_proc_access,
10397 .readlink = nfs4_proc_readlink,
10398 .create = nfs4_proc_create,
10399 .remove = nfs4_proc_remove,
10400 .unlink_setup = nfs4_proc_unlink_setup,
10401 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10402 .unlink_done = nfs4_proc_unlink_done,
10403 .rename_setup = nfs4_proc_rename_setup,
10404 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10405 .rename_done = nfs4_proc_rename_done,
10406 .link = nfs4_proc_link,
10407 .symlink = nfs4_proc_symlink,
10408 .mkdir = nfs4_proc_mkdir,
10409 .rmdir = nfs4_proc_rmdir,
10410 .readdir = nfs4_proc_readdir,
10411 .mknod = nfs4_proc_mknod,
10412 .statfs = nfs4_proc_statfs,
10413 .fsinfo = nfs4_proc_fsinfo,
10414 .pathconf = nfs4_proc_pathconf,
10415 .set_capabilities = nfs4_server_capabilities,
10416 .decode_dirent = nfs4_decode_dirent,
10417 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10418 .read_setup = nfs4_proc_read_setup,
10419 .read_done = nfs4_read_done,
10420 .write_setup = nfs4_proc_write_setup,
10421 .write_done = nfs4_write_done,
10422 .commit_setup = nfs4_proc_commit_setup,
10423 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10424 .commit_done = nfs4_commit_done,
10425 .lock = nfs4_proc_lock,
10426 .clear_acl_cache = nfs4_zap_acl_attr,
10427 .close_context = nfs4_close_context,
10428 .open_context = nfs4_atomic_open,
10429 .have_delegation = nfs4_have_delegation,
10430 .alloc_client = nfs4_alloc_client,
10431 .init_client = nfs4_init_client,
10432 .free_client = nfs4_free_client,
10433 .create_server = nfs4_create_server,
10434 .clone_server = nfs_clone_server,
10435 };
10436
10437 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10438 .name = XATTR_NAME_NFSV4_ACL,
10439 .list = nfs4_xattr_list_nfs4_acl,
10440 .get = nfs4_xattr_get_nfs4_acl,
10441 .set = nfs4_xattr_set_nfs4_acl,
10442 };
10443
10444 #ifdef CONFIG_NFS_V4_2
10445 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10446 .prefix = XATTR_USER_PREFIX,
10447 .get = nfs4_xattr_get_nfs4_user,
10448 .set = nfs4_xattr_set_nfs4_user,
10449 };
10450 #endif
10451
10452 const struct xattr_handler *nfs4_xattr_handlers[] = {
10453 &nfs4_xattr_nfs4_acl_handler,
10454 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10455 &nfs4_xattr_nfs4_label_handler,
10456 #endif
10457 #ifdef CONFIG_NFS_V4_2
10458 &nfs4_xattr_nfs4_user_handler,
10459 #endif
10460 NULL
10461 };
10462