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/file.h>
42 #include <linux/string.h>
43 #include <linux/ratelimit.h>
44 #include <linux/printk.h>
45 #include <linux/slab.h>
46 #include <linux/sunrpc/clnt.h>
47 #include <linux/nfs.h>
48 #include <linux/nfs4.h>
49 #include <linux/nfs_fs.h>
50 #include <linux/nfs_page.h>
51 #include <linux/nfs_mount.h>
52 #include <linux/namei.h>
53 #include <linux/mount.h>
54 #include <linux/module.h>
55 #include <linux/xattr.h>
56 #include <linux/utsname.h>
57 #include <linux/freezer.h>
58
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "nfs4idmap.h"
67 #include "nfs4session.h"
68 #include "fscache.h"
69
70 #include "nfs4trace.h"
71
72 #define NFSDBG_FACILITY NFSDBG_PROC
73
74 #define NFS4_POLL_RETRY_MIN (HZ/10)
75 #define NFS4_POLL_RETRY_MAX (15*HZ)
76
77 struct nfs4_opendata;
78 static int _nfs4_proc_open(struct nfs4_opendata *data);
79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
81 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
82 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
83 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
84 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
85 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
86 struct nfs_fattr *fattr, struct iattr *sattr,
87 struct nfs4_state *state, struct nfs4_label *ilabel,
88 struct nfs4_label *olabel);
89 #ifdef CONFIG_NFS_V4_1
90 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
91 struct rpc_cred *);
92 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
93 struct rpc_cred *);
94 #endif
95
96 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
97 static inline struct nfs4_label *
98 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
99 struct iattr *sattr, struct nfs4_label *label)
100 {
101 int err;
102
103 if (label == NULL)
104 return NULL;
105
106 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
107 return NULL;
108
109 err = security_dentry_init_security(dentry, sattr->ia_mode,
110 &dentry->d_name, (void **)&label->label, &label->len);
111 if (err == 0)
112 return label;
113
114 return NULL;
115 }
116 static inline void
117 nfs4_label_release_security(struct nfs4_label *label)
118 {
119 if (label)
120 security_release_secctx(label->label, label->len);
121 }
122 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
123 {
124 if (label)
125 return server->attr_bitmask;
126
127 return server->attr_bitmask_nl;
128 }
129 #else
130 static inline struct nfs4_label *
131 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
132 struct iattr *sattr, struct nfs4_label *l)
133 { return NULL; }
134 static inline void
135 nfs4_label_release_security(struct nfs4_label *label)
136 { return; }
137 static inline u32 *
138 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
139 { return server->attr_bitmask; }
140 #endif
141
142 /* Prevent leaks of NFSv4 errors into userland */
143 static int nfs4_map_errors(int err)
144 {
145 if (err >= -1000)
146 return err;
147 switch (err) {
148 case -NFS4ERR_RESOURCE:
149 case -NFS4ERR_LAYOUTTRYLATER:
150 case -NFS4ERR_RECALLCONFLICT:
151 return -EREMOTEIO;
152 case -NFS4ERR_WRONGSEC:
153 case -NFS4ERR_WRONG_CRED:
154 return -EPERM;
155 case -NFS4ERR_BADOWNER:
156 case -NFS4ERR_BADNAME:
157 return -EINVAL;
158 case -NFS4ERR_SHARE_DENIED:
159 return -EACCES;
160 case -NFS4ERR_MINOR_VERS_MISMATCH:
161 return -EPROTONOSUPPORT;
162 case -NFS4ERR_FILE_OPEN:
163 return -EBUSY;
164 default:
165 dprintk("%s could not handle NFSv4 error %d\n",
166 __func__, -err);
167 break;
168 }
169 return -EIO;
170 }
171
172 /*
173 * This is our standard bitmap for GETATTR requests.
174 */
175 const u32 nfs4_fattr_bitmap[3] = {
176 FATTR4_WORD0_TYPE
177 | FATTR4_WORD0_CHANGE
178 | FATTR4_WORD0_SIZE
179 | FATTR4_WORD0_FSID
180 | FATTR4_WORD0_FILEID,
181 FATTR4_WORD1_MODE
182 | FATTR4_WORD1_NUMLINKS
183 | FATTR4_WORD1_OWNER
184 | FATTR4_WORD1_OWNER_GROUP
185 | FATTR4_WORD1_RAWDEV
186 | FATTR4_WORD1_SPACE_USED
187 | FATTR4_WORD1_TIME_ACCESS
188 | FATTR4_WORD1_TIME_METADATA
189 | FATTR4_WORD1_TIME_MODIFY
190 | FATTR4_WORD1_MOUNTED_ON_FILEID,
191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
192 FATTR4_WORD2_SECURITY_LABEL
193 #endif
194 };
195
196 static const u32 nfs4_pnfs_open_bitmap[3] = {
197 FATTR4_WORD0_TYPE
198 | FATTR4_WORD0_CHANGE
199 | FATTR4_WORD0_SIZE
200 | FATTR4_WORD0_FSID
201 | FATTR4_WORD0_FILEID,
202 FATTR4_WORD1_MODE
203 | FATTR4_WORD1_NUMLINKS
204 | FATTR4_WORD1_OWNER
205 | FATTR4_WORD1_OWNER_GROUP
206 | FATTR4_WORD1_RAWDEV
207 | FATTR4_WORD1_SPACE_USED
208 | FATTR4_WORD1_TIME_ACCESS
209 | FATTR4_WORD1_TIME_METADATA
210 | FATTR4_WORD1_TIME_MODIFY,
211 FATTR4_WORD2_MDSTHRESHOLD
212 };
213
214 static const u32 nfs4_open_noattr_bitmap[3] = {
215 FATTR4_WORD0_TYPE
216 | FATTR4_WORD0_CHANGE
217 | FATTR4_WORD0_FILEID,
218 };
219
220 const u32 nfs4_statfs_bitmap[3] = {
221 FATTR4_WORD0_FILES_AVAIL
222 | FATTR4_WORD0_FILES_FREE
223 | FATTR4_WORD0_FILES_TOTAL,
224 FATTR4_WORD1_SPACE_AVAIL
225 | FATTR4_WORD1_SPACE_FREE
226 | FATTR4_WORD1_SPACE_TOTAL
227 };
228
229 const u32 nfs4_pathconf_bitmap[3] = {
230 FATTR4_WORD0_MAXLINK
231 | FATTR4_WORD0_MAXNAME,
232 0
233 };
234
235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
236 | FATTR4_WORD0_MAXREAD
237 | FATTR4_WORD0_MAXWRITE
238 | FATTR4_WORD0_LEASE_TIME,
239 FATTR4_WORD1_TIME_DELTA
240 | FATTR4_WORD1_FS_LAYOUT_TYPES,
241 FATTR4_WORD2_LAYOUT_BLKSIZE
242 };
243
244 const u32 nfs4_fs_locations_bitmap[3] = {
245 FATTR4_WORD0_TYPE
246 | FATTR4_WORD0_CHANGE
247 | FATTR4_WORD0_SIZE
248 | FATTR4_WORD0_FSID
249 | FATTR4_WORD0_FILEID
250 | FATTR4_WORD0_FS_LOCATIONS,
251 FATTR4_WORD1_MODE
252 | FATTR4_WORD1_NUMLINKS
253 | FATTR4_WORD1_OWNER
254 | FATTR4_WORD1_OWNER_GROUP
255 | FATTR4_WORD1_RAWDEV
256 | FATTR4_WORD1_SPACE_USED
257 | FATTR4_WORD1_TIME_ACCESS
258 | FATTR4_WORD1_TIME_METADATA
259 | FATTR4_WORD1_TIME_MODIFY
260 | FATTR4_WORD1_MOUNTED_ON_FILEID,
261 };
262
263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
264 struct nfs4_readdir_arg *readdir)
265 {
266 __be32 *start, *p;
267
268 if (cookie > 2) {
269 readdir->cookie = cookie;
270 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
271 return;
272 }
273
274 readdir->cookie = 0;
275 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
276 if (cookie == 2)
277 return;
278
279 /*
280 * NFSv4 servers do not return entries for '.' and '..'
281 * Therefore, we fake these entries here. We let '.'
282 * have cookie 0 and '..' have cookie 1. Note that
283 * when talking to the server, we always send cookie 0
284 * instead of 1 or 2.
285 */
286 start = p = kmap_atomic(*readdir->pages);
287
288 if (cookie == 0) {
289 *p++ = xdr_one; /* next */
290 *p++ = xdr_zero; /* cookie, first word */
291 *p++ = xdr_one; /* cookie, second word */
292 *p++ = xdr_one; /* entry len */
293 memcpy(p, ".\0\0\0", 4); /* entry */
294 p++;
295 *p++ = xdr_one; /* bitmap length */
296 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
297 *p++ = htonl(8); /* attribute buffer length */
298 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
299 }
300
301 *p++ = xdr_one; /* next */
302 *p++ = xdr_zero; /* cookie, first word */
303 *p++ = xdr_two; /* cookie, second word */
304 *p++ = xdr_two; /* entry len */
305 memcpy(p, "..\0\0", 4); /* entry */
306 p++;
307 *p++ = xdr_one; /* bitmap length */
308 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
309 *p++ = htonl(8); /* attribute buffer length */
310 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
311
312 readdir->pgbase = (char *)p - (char *)start;
313 readdir->count -= readdir->pgbase;
314 kunmap_atomic(start);
315 }
316
317 static long nfs4_update_delay(long *timeout)
318 {
319 long ret;
320 if (!timeout)
321 return NFS4_POLL_RETRY_MAX;
322 if (*timeout <= 0)
323 *timeout = NFS4_POLL_RETRY_MIN;
324 if (*timeout > NFS4_POLL_RETRY_MAX)
325 *timeout = NFS4_POLL_RETRY_MAX;
326 ret = *timeout;
327 *timeout <<= 1;
328 return ret;
329 }
330
331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
332 {
333 int res = 0;
334
335 might_sleep();
336
337 freezable_schedule_timeout_killable_unsafe(
338 nfs4_update_delay(timeout));
339 if (fatal_signal_pending(current))
340 res = -ERESTARTSYS;
341 return res;
342 }
343
344 /* This is the error handling routine for processes that are allowed
345 * to sleep.
346 */
347 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
348 {
349 struct nfs_client *clp = server->nfs_client;
350 struct nfs4_state *state = exception->state;
351 struct inode *inode = exception->inode;
352 int ret = errorcode;
353
354 exception->retry = 0;
355 switch(errorcode) {
356 case 0:
357 return 0;
358 case -NFS4ERR_OPENMODE:
359 case -NFS4ERR_DELEG_REVOKED:
360 case -NFS4ERR_ADMIN_REVOKED:
361 case -NFS4ERR_BAD_STATEID:
362 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
363 nfs4_inode_return_delegation(inode);
364 exception->retry = 1;
365 return 0;
366 }
367 if (state == NULL)
368 break;
369 ret = nfs4_schedule_stateid_recovery(server, state);
370 if (ret < 0)
371 break;
372 goto wait_on_recovery;
373 case -NFS4ERR_EXPIRED:
374 if (state != NULL) {
375 ret = nfs4_schedule_stateid_recovery(server, state);
376 if (ret < 0)
377 break;
378 }
379 case -NFS4ERR_STALE_STATEID:
380 case -NFS4ERR_STALE_CLIENTID:
381 nfs4_schedule_lease_recovery(clp);
382 goto wait_on_recovery;
383 case -NFS4ERR_MOVED:
384 ret = nfs4_schedule_migration_recovery(server);
385 if (ret < 0)
386 break;
387 goto wait_on_recovery;
388 case -NFS4ERR_LEASE_MOVED:
389 nfs4_schedule_lease_moved_recovery(clp);
390 goto wait_on_recovery;
391 #if defined(CONFIG_NFS_V4_1)
392 case -NFS4ERR_BADSESSION:
393 case -NFS4ERR_BADSLOT:
394 case -NFS4ERR_BAD_HIGH_SLOT:
395 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
396 case -NFS4ERR_DEADSESSION:
397 case -NFS4ERR_SEQ_FALSE_RETRY:
398 case -NFS4ERR_SEQ_MISORDERED:
399 dprintk("%s ERROR: %d Reset session\n", __func__,
400 errorcode);
401 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
402 goto wait_on_recovery;
403 #endif /* defined(CONFIG_NFS_V4_1) */
404 case -NFS4ERR_FILE_OPEN:
405 if (exception->timeout > HZ) {
406 /* We have retried a decent amount, time to
407 * fail
408 */
409 ret = -EBUSY;
410 break;
411 }
412 case -NFS4ERR_GRACE:
413 case -NFS4ERR_DELAY:
414 ret = nfs4_delay(server->client, &exception->timeout);
415 if (ret != 0)
416 break;
417 case -NFS4ERR_RETRY_UNCACHED_REP:
418 case -NFS4ERR_OLD_STATEID:
419 exception->retry = 1;
420 break;
421 case -NFS4ERR_BADOWNER:
422 /* The following works around a Linux server bug! */
423 case -NFS4ERR_BADNAME:
424 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
425 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
426 exception->retry = 1;
427 printk(KERN_WARNING "NFS: v4 server %s "
428 "does not accept raw "
429 "uid/gids. "
430 "Reenabling the idmapper.\n",
431 server->nfs_client->cl_hostname);
432 }
433 }
434 /* We failed to handle the error */
435 return nfs4_map_errors(ret);
436 wait_on_recovery:
437 ret = nfs4_wait_clnt_recover(clp);
438 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
439 return -EIO;
440 if (ret == 0)
441 exception->retry = 1;
442 return ret;
443 }
444
445 /*
446 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
447 * or 'false' otherwise.
448 */
449 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
450 {
451 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
452
453 if (flavor == RPC_AUTH_GSS_KRB5I ||
454 flavor == RPC_AUTH_GSS_KRB5P)
455 return true;
456
457 return false;
458 }
459
460 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
461 {
462 spin_lock(&clp->cl_lock);
463 if (time_before(clp->cl_last_renewal,timestamp))
464 clp->cl_last_renewal = timestamp;
465 spin_unlock(&clp->cl_lock);
466 }
467
468 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
469 {
470 struct nfs_client *clp = server->nfs_client;
471
472 if (!nfs4_has_session(clp))
473 do_renew_lease(clp, timestamp);
474 }
475
476 struct nfs4_call_sync_data {
477 const struct nfs_server *seq_server;
478 struct nfs4_sequence_args *seq_args;
479 struct nfs4_sequence_res *seq_res;
480 };
481
482 void nfs4_init_sequence(struct nfs4_sequence_args *args,
483 struct nfs4_sequence_res *res, int cache_reply)
484 {
485 args->sa_slot = NULL;
486 args->sa_cache_this = cache_reply;
487 args->sa_privileged = 0;
488
489 res->sr_slot = NULL;
490 }
491
492 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
493 {
494 args->sa_privileged = 1;
495 }
496
497 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
498 struct nfs4_sequence_args *args,
499 struct nfs4_sequence_res *res,
500 struct rpc_task *task)
501 {
502 struct nfs4_slot *slot;
503
504 /* slot already allocated? */
505 if (res->sr_slot != NULL)
506 goto out_start;
507
508 spin_lock(&tbl->slot_tbl_lock);
509 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
510 goto out_sleep;
511
512 slot = nfs4_alloc_slot(tbl);
513 if (IS_ERR(slot)) {
514 if (slot == ERR_PTR(-ENOMEM))
515 task->tk_timeout = HZ >> 2;
516 goto out_sleep;
517 }
518 spin_unlock(&tbl->slot_tbl_lock);
519
520 args->sa_slot = slot;
521 res->sr_slot = slot;
522
523 out_start:
524 rpc_call_start(task);
525 return 0;
526
527 out_sleep:
528 if (args->sa_privileged)
529 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
530 NULL, RPC_PRIORITY_PRIVILEGED);
531 else
532 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
533 spin_unlock(&tbl->slot_tbl_lock);
534 return -EAGAIN;
535 }
536 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
537
538 static int nfs40_sequence_done(struct rpc_task *task,
539 struct nfs4_sequence_res *res)
540 {
541 struct nfs4_slot *slot = res->sr_slot;
542 struct nfs4_slot_table *tbl;
543
544 if (slot == NULL)
545 goto out;
546
547 tbl = slot->table;
548 spin_lock(&tbl->slot_tbl_lock);
549 if (!nfs41_wake_and_assign_slot(tbl, slot))
550 nfs4_free_slot(tbl, slot);
551 spin_unlock(&tbl->slot_tbl_lock);
552
553 res->sr_slot = NULL;
554 out:
555 return 1;
556 }
557
558 #if defined(CONFIG_NFS_V4_1)
559
560 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
561 {
562 struct nfs4_session *session;
563 struct nfs4_slot_table *tbl;
564 struct nfs4_slot *slot = res->sr_slot;
565 bool send_new_highest_used_slotid = false;
566
567 tbl = slot->table;
568 session = tbl->session;
569
570 spin_lock(&tbl->slot_tbl_lock);
571 /* Be nice to the server: try to ensure that the last transmitted
572 * value for highest_user_slotid <= target_highest_slotid
573 */
574 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
575 send_new_highest_used_slotid = true;
576
577 if (nfs41_wake_and_assign_slot(tbl, slot)) {
578 send_new_highest_used_slotid = false;
579 goto out_unlock;
580 }
581 nfs4_free_slot(tbl, slot);
582
583 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
584 send_new_highest_used_slotid = false;
585 out_unlock:
586 spin_unlock(&tbl->slot_tbl_lock);
587 res->sr_slot = NULL;
588 if (send_new_highest_used_slotid)
589 nfs41_server_notify_highest_slotid_update(session->clp);
590 }
591
592 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
593 {
594 struct nfs4_session *session;
595 struct nfs4_slot *slot = res->sr_slot;
596 struct nfs_client *clp;
597 bool interrupted = false;
598 int ret = 1;
599
600 if (slot == NULL)
601 goto out_noaction;
602 /* don't increment the sequence number if the task wasn't sent */
603 if (!RPC_WAS_SENT(task))
604 goto out;
605
606 session = slot->table->session;
607
608 if (slot->interrupted) {
609 slot->interrupted = 0;
610 interrupted = true;
611 }
612
613 trace_nfs4_sequence_done(session, res);
614 /* Check the SEQUENCE operation status */
615 switch (res->sr_status) {
616 case 0:
617 /* Update the slot's sequence and clientid lease timer */
618 ++slot->seq_nr;
619 clp = session->clp;
620 do_renew_lease(clp, res->sr_timestamp);
621 /* Check sequence flags */
622 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
623 nfs41_update_target_slotid(slot->table, slot, res);
624 break;
625 case 1:
626 /*
627 * sr_status remains 1 if an RPC level error occurred.
628 * The server may or may not have processed the sequence
629 * operation..
630 * Mark the slot as having hosted an interrupted RPC call.
631 */
632 slot->interrupted = 1;
633 goto out;
634 case -NFS4ERR_DELAY:
635 /* The server detected a resend of the RPC call and
636 * returned NFS4ERR_DELAY as per Section 2.10.6.2
637 * of RFC5661.
638 */
639 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
640 __func__,
641 slot->slot_nr,
642 slot->seq_nr);
643 goto out_retry;
644 case -NFS4ERR_BADSLOT:
645 /*
646 * The slot id we used was probably retired. Try again
647 * using a different slot id.
648 */
649 goto retry_nowait;
650 case -NFS4ERR_SEQ_MISORDERED:
651 /*
652 * Was the last operation on this sequence interrupted?
653 * If so, retry after bumping the sequence number.
654 */
655 if (interrupted) {
656 ++slot->seq_nr;
657 goto retry_nowait;
658 }
659 /*
660 * Could this slot have been previously retired?
661 * If so, then the server may be expecting seq_nr = 1!
662 */
663 if (slot->seq_nr != 1) {
664 slot->seq_nr = 1;
665 goto retry_nowait;
666 }
667 break;
668 case -NFS4ERR_SEQ_FALSE_RETRY:
669 ++slot->seq_nr;
670 goto retry_nowait;
671 default:
672 /* Just update the slot sequence no. */
673 ++slot->seq_nr;
674 }
675 out:
676 /* The session may be reset by one of the error handlers. */
677 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
678 nfs41_sequence_free_slot(res);
679 out_noaction:
680 return ret;
681 retry_nowait:
682 if (rpc_restart_call_prepare(task)) {
683 task->tk_status = 0;
684 ret = 0;
685 }
686 goto out;
687 out_retry:
688 if (!rpc_restart_call(task))
689 goto out;
690 rpc_delay(task, NFS4_POLL_RETRY_MAX);
691 return 0;
692 }
693 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
694
695 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
696 {
697 if (res->sr_slot == NULL)
698 return 1;
699 if (!res->sr_slot->table->session)
700 return nfs40_sequence_done(task, res);
701 return nfs41_sequence_done(task, res);
702 }
703 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
704
705 int nfs41_setup_sequence(struct nfs4_session *session,
706 struct nfs4_sequence_args *args,
707 struct nfs4_sequence_res *res,
708 struct rpc_task *task)
709 {
710 struct nfs4_slot *slot;
711 struct nfs4_slot_table *tbl;
712
713 dprintk("--> %s\n", __func__);
714 /* slot already allocated? */
715 if (res->sr_slot != NULL)
716 goto out_success;
717
718 tbl = &session->fc_slot_table;
719
720 task->tk_timeout = 0;
721
722 spin_lock(&tbl->slot_tbl_lock);
723 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
724 !args->sa_privileged) {
725 /* The state manager will wait until the slot table is empty */
726 dprintk("%s session is draining\n", __func__);
727 goto out_sleep;
728 }
729
730 slot = nfs4_alloc_slot(tbl);
731 if (IS_ERR(slot)) {
732 /* If out of memory, try again in 1/4 second */
733 if (slot == ERR_PTR(-ENOMEM))
734 task->tk_timeout = HZ >> 2;
735 dprintk("<-- %s: no free slots\n", __func__);
736 goto out_sleep;
737 }
738 spin_unlock(&tbl->slot_tbl_lock);
739
740 args->sa_slot = slot;
741
742 dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
743 slot->slot_nr, slot->seq_nr);
744
745 res->sr_slot = slot;
746 res->sr_timestamp = jiffies;
747 res->sr_status_flags = 0;
748 /*
749 * sr_status is only set in decode_sequence, and so will remain
750 * set to 1 if an rpc level failure occurs.
751 */
752 res->sr_status = 1;
753 trace_nfs4_setup_sequence(session, args);
754 out_success:
755 rpc_call_start(task);
756 return 0;
757 out_sleep:
758 /* Privileged tasks are queued with top priority */
759 if (args->sa_privileged)
760 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
761 NULL, RPC_PRIORITY_PRIVILEGED);
762 else
763 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
764 spin_unlock(&tbl->slot_tbl_lock);
765 return -EAGAIN;
766 }
767 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
768
769 static int nfs4_setup_sequence(const struct nfs_server *server,
770 struct nfs4_sequence_args *args,
771 struct nfs4_sequence_res *res,
772 struct rpc_task *task)
773 {
774 struct nfs4_session *session = nfs4_get_session(server);
775 int ret = 0;
776
777 if (!session)
778 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
779 args, res, task);
780
781 dprintk("--> %s clp %p session %p sr_slot %u\n",
782 __func__, session->clp, session, res->sr_slot ?
783 res->sr_slot->slot_nr : NFS4_NO_SLOT);
784
785 ret = nfs41_setup_sequence(session, args, res, task);
786
787 dprintk("<-- %s status=%d\n", __func__, ret);
788 return ret;
789 }
790
791 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
792 {
793 struct nfs4_call_sync_data *data = calldata;
794 struct nfs4_session *session = nfs4_get_session(data->seq_server);
795
796 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
797
798 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
799 }
800
801 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
802 {
803 struct nfs4_call_sync_data *data = calldata;
804
805 nfs41_sequence_done(task, data->seq_res);
806 }
807
808 static const struct rpc_call_ops nfs41_call_sync_ops = {
809 .rpc_call_prepare = nfs41_call_sync_prepare,
810 .rpc_call_done = nfs41_call_sync_done,
811 };
812
813 #else /* !CONFIG_NFS_V4_1 */
814
815 static int nfs4_setup_sequence(const struct nfs_server *server,
816 struct nfs4_sequence_args *args,
817 struct nfs4_sequence_res *res,
818 struct rpc_task *task)
819 {
820 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
821 args, res, task);
822 }
823
824 int nfs4_sequence_done(struct rpc_task *task,
825 struct nfs4_sequence_res *res)
826 {
827 return nfs40_sequence_done(task, res);
828 }
829 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
830
831 #endif /* !CONFIG_NFS_V4_1 */
832
833 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
834 {
835 struct nfs4_call_sync_data *data = calldata;
836 nfs4_setup_sequence(data->seq_server,
837 data->seq_args, data->seq_res, task);
838 }
839
840 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
841 {
842 struct nfs4_call_sync_data *data = calldata;
843 nfs4_sequence_done(task, data->seq_res);
844 }
845
846 static const struct rpc_call_ops nfs40_call_sync_ops = {
847 .rpc_call_prepare = nfs40_call_sync_prepare,
848 .rpc_call_done = nfs40_call_sync_done,
849 };
850
851 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
852 struct nfs_server *server,
853 struct rpc_message *msg,
854 struct nfs4_sequence_args *args,
855 struct nfs4_sequence_res *res)
856 {
857 int ret;
858 struct rpc_task *task;
859 struct nfs_client *clp = server->nfs_client;
860 struct nfs4_call_sync_data data = {
861 .seq_server = server,
862 .seq_args = args,
863 .seq_res = res,
864 };
865 struct rpc_task_setup task_setup = {
866 .rpc_client = clnt,
867 .rpc_message = msg,
868 .callback_ops = clp->cl_mvops->call_sync_ops,
869 .callback_data = &data
870 };
871
872 task = rpc_run_task(&task_setup);
873 if (IS_ERR(task))
874 ret = PTR_ERR(task);
875 else {
876 ret = task->tk_status;
877 rpc_put_task(task);
878 }
879 return ret;
880 }
881
882 int nfs4_call_sync(struct rpc_clnt *clnt,
883 struct nfs_server *server,
884 struct rpc_message *msg,
885 struct nfs4_sequence_args *args,
886 struct nfs4_sequence_res *res,
887 int cache_reply)
888 {
889 nfs4_init_sequence(args, res, cache_reply);
890 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
891 }
892
893 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
894 {
895 struct nfs_inode *nfsi = NFS_I(dir);
896
897 spin_lock(&dir->i_lock);
898 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
899 if (!cinfo->atomic || cinfo->before != dir->i_version)
900 nfs_force_lookup_revalidate(dir);
901 dir->i_version = cinfo->after;
902 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
903 nfs_fscache_invalidate(dir);
904 spin_unlock(&dir->i_lock);
905 }
906
907 struct nfs4_opendata {
908 struct kref kref;
909 struct nfs_openargs o_arg;
910 struct nfs_openres o_res;
911 struct nfs_open_confirmargs c_arg;
912 struct nfs_open_confirmres c_res;
913 struct nfs4_string owner_name;
914 struct nfs4_string group_name;
915 struct nfs4_label *a_label;
916 struct nfs_fattr f_attr;
917 struct nfs4_label *f_label;
918 struct dentry *dir;
919 struct dentry *dentry;
920 struct nfs4_state_owner *owner;
921 struct nfs4_state *state;
922 struct iattr attrs;
923 unsigned long timestamp;
924 unsigned int rpc_done : 1;
925 unsigned int file_created : 1;
926 unsigned int is_recover : 1;
927 int rpc_status;
928 int cancelled;
929 };
930
931 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
932 int err, struct nfs4_exception *exception)
933 {
934 if (err != -EINVAL)
935 return false;
936 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
937 return false;
938 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
939 exception->retry = 1;
940 return true;
941 }
942
943 static u32
944 nfs4_map_atomic_open_share(struct nfs_server *server,
945 fmode_t fmode, int openflags)
946 {
947 u32 res = 0;
948
949 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
950 case FMODE_READ:
951 res = NFS4_SHARE_ACCESS_READ;
952 break;
953 case FMODE_WRITE:
954 res = NFS4_SHARE_ACCESS_WRITE;
955 break;
956 case FMODE_READ|FMODE_WRITE:
957 res = NFS4_SHARE_ACCESS_BOTH;
958 }
959 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
960 goto out;
961 /* Want no delegation if we're using O_DIRECT */
962 if (openflags & O_DIRECT)
963 res |= NFS4_SHARE_WANT_NO_DELEG;
964 out:
965 return res;
966 }
967
968 static enum open_claim_type4
969 nfs4_map_atomic_open_claim(struct nfs_server *server,
970 enum open_claim_type4 claim)
971 {
972 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
973 return claim;
974 switch (claim) {
975 default:
976 return claim;
977 case NFS4_OPEN_CLAIM_FH:
978 return NFS4_OPEN_CLAIM_NULL;
979 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
980 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
981 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
982 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
983 }
984 }
985
986 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
987 {
988 p->o_res.f_attr = &p->f_attr;
989 p->o_res.f_label = p->f_label;
990 p->o_res.seqid = p->o_arg.seqid;
991 p->c_res.seqid = p->c_arg.seqid;
992 p->o_res.server = p->o_arg.server;
993 p->o_res.access_request = p->o_arg.access;
994 nfs_fattr_init(&p->f_attr);
995 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
996 }
997
998 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
999 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1000 const struct iattr *attrs,
1001 struct nfs4_label *label,
1002 enum open_claim_type4 claim,
1003 gfp_t gfp_mask)
1004 {
1005 struct dentry *parent = dget_parent(dentry);
1006 struct inode *dir = d_inode(parent);
1007 struct nfs_server *server = NFS_SERVER(dir);
1008 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1009 struct nfs4_opendata *p;
1010
1011 p = kzalloc(sizeof(*p), gfp_mask);
1012 if (p == NULL)
1013 goto err;
1014
1015 p->f_label = nfs4_label_alloc(server, gfp_mask);
1016 if (IS_ERR(p->f_label))
1017 goto err_free_p;
1018
1019 p->a_label = nfs4_label_alloc(server, gfp_mask);
1020 if (IS_ERR(p->a_label))
1021 goto err_free_f;
1022
1023 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1024 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1025 if (IS_ERR(p->o_arg.seqid))
1026 goto err_free_label;
1027 nfs_sb_active(dentry->d_sb);
1028 p->dentry = dget(dentry);
1029 p->dir = parent;
1030 p->owner = sp;
1031 atomic_inc(&sp->so_count);
1032 p->o_arg.open_flags = flags;
1033 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1034 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1035 fmode, flags);
1036 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1037 * will return permission denied for all bits until close */
1038 if (!(flags & O_EXCL)) {
1039 /* ask server to check for all possible rights as results
1040 * are cached */
1041 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1042 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1043 }
1044 p->o_arg.clientid = server->nfs_client->cl_clientid;
1045 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1046 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1047 p->o_arg.name = &dentry->d_name;
1048 p->o_arg.server = server;
1049 p->o_arg.bitmask = nfs4_bitmask(server, label);
1050 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1051 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1052 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1053 switch (p->o_arg.claim) {
1054 case NFS4_OPEN_CLAIM_NULL:
1055 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1056 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1057 p->o_arg.fh = NFS_FH(dir);
1058 break;
1059 case NFS4_OPEN_CLAIM_PREVIOUS:
1060 case NFS4_OPEN_CLAIM_FH:
1061 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1062 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1063 p->o_arg.fh = NFS_FH(d_inode(dentry));
1064 }
1065 if (attrs != NULL && attrs->ia_valid != 0) {
1066 __u32 verf[2];
1067
1068 p->o_arg.u.attrs = &p->attrs;
1069 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1070
1071 verf[0] = jiffies;
1072 verf[1] = current->pid;
1073 memcpy(p->o_arg.u.verifier.data, verf,
1074 sizeof(p->o_arg.u.verifier.data));
1075 }
1076 p->c_arg.fh = &p->o_res.fh;
1077 p->c_arg.stateid = &p->o_res.stateid;
1078 p->c_arg.seqid = p->o_arg.seqid;
1079 nfs4_init_opendata_res(p);
1080 kref_init(&p->kref);
1081 return p;
1082
1083 err_free_label:
1084 nfs4_label_free(p->a_label);
1085 err_free_f:
1086 nfs4_label_free(p->f_label);
1087 err_free_p:
1088 kfree(p);
1089 err:
1090 dput(parent);
1091 return NULL;
1092 }
1093
1094 static void nfs4_opendata_free(struct kref *kref)
1095 {
1096 struct nfs4_opendata *p = container_of(kref,
1097 struct nfs4_opendata, kref);
1098 struct super_block *sb = p->dentry->d_sb;
1099
1100 nfs_free_seqid(p->o_arg.seqid);
1101 if (p->state != NULL)
1102 nfs4_put_open_state(p->state);
1103 nfs4_put_state_owner(p->owner);
1104
1105 nfs4_label_free(p->a_label);
1106 nfs4_label_free(p->f_label);
1107
1108 dput(p->dir);
1109 dput(p->dentry);
1110 nfs_sb_deactive(sb);
1111 nfs_fattr_free_names(&p->f_attr);
1112 kfree(p->f_attr.mdsthreshold);
1113 kfree(p);
1114 }
1115
1116 static void nfs4_opendata_put(struct nfs4_opendata *p)
1117 {
1118 if (p != NULL)
1119 kref_put(&p->kref, nfs4_opendata_free);
1120 }
1121
1122 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1123 {
1124 int ret;
1125
1126 ret = rpc_wait_for_completion_task(task);
1127 return ret;
1128 }
1129
1130 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1131 fmode_t fmode)
1132 {
1133 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1134 case FMODE_READ|FMODE_WRITE:
1135 return state->n_rdwr != 0;
1136 case FMODE_WRITE:
1137 return state->n_wronly != 0;
1138 case FMODE_READ:
1139 return state->n_rdonly != 0;
1140 }
1141 WARN_ON_ONCE(1);
1142 return false;
1143 }
1144
1145 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1146 {
1147 int ret = 0;
1148
1149 if (open_mode & (O_EXCL|O_TRUNC))
1150 goto out;
1151 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1152 case FMODE_READ:
1153 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1154 && state->n_rdonly != 0;
1155 break;
1156 case FMODE_WRITE:
1157 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1158 && state->n_wronly != 0;
1159 break;
1160 case FMODE_READ|FMODE_WRITE:
1161 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1162 && state->n_rdwr != 0;
1163 }
1164 out:
1165 return ret;
1166 }
1167
1168 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1169 {
1170 if (delegation == NULL)
1171 return 0;
1172 if ((delegation->type & fmode) != fmode)
1173 return 0;
1174 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1175 return 0;
1176 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1177 return 0;
1178 nfs_mark_delegation_referenced(delegation);
1179 return 1;
1180 }
1181
1182 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1183 {
1184 switch (fmode) {
1185 case FMODE_WRITE:
1186 state->n_wronly++;
1187 break;
1188 case FMODE_READ:
1189 state->n_rdonly++;
1190 break;
1191 case FMODE_READ|FMODE_WRITE:
1192 state->n_rdwr++;
1193 }
1194 nfs4_state_set_mode_locked(state, state->state | fmode);
1195 }
1196
1197 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1198 {
1199 struct nfs_client *clp = state->owner->so_server->nfs_client;
1200 bool need_recover = false;
1201
1202 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1203 need_recover = true;
1204 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1205 need_recover = true;
1206 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1207 need_recover = true;
1208 if (need_recover)
1209 nfs4_state_mark_reclaim_nograce(clp, state);
1210 }
1211
1212 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1213 nfs4_stateid *stateid)
1214 {
1215 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1216 return true;
1217 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1218 nfs_test_and_clear_all_open_stateid(state);
1219 return true;
1220 }
1221 if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1222 return true;
1223 return false;
1224 }
1225
1226 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1227 {
1228 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1229 return;
1230 if (state->n_wronly)
1231 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1232 if (state->n_rdonly)
1233 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1234 if (state->n_rdwr)
1235 set_bit(NFS_O_RDWR_STATE, &state->flags);
1236 set_bit(NFS_OPEN_STATE, &state->flags);
1237 }
1238
1239 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1240 nfs4_stateid *arg_stateid,
1241 nfs4_stateid *stateid, fmode_t fmode)
1242 {
1243 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1244 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1245 case FMODE_WRITE:
1246 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1247 break;
1248 case FMODE_READ:
1249 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1250 break;
1251 case 0:
1252 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1253 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1254 clear_bit(NFS_OPEN_STATE, &state->flags);
1255 }
1256 if (stateid == NULL)
1257 return;
1258 /* Handle races with OPEN */
1259 if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1260 (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1261 !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1262 nfs_resync_open_stateid_locked(state);
1263 return;
1264 }
1265 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1266 nfs4_stateid_copy(&state->stateid, stateid);
1267 nfs4_stateid_copy(&state->open_stateid, stateid);
1268 }
1269
1270 static void nfs_clear_open_stateid(struct nfs4_state *state,
1271 nfs4_stateid *arg_stateid,
1272 nfs4_stateid *stateid, fmode_t fmode)
1273 {
1274 write_seqlock(&state->seqlock);
1275 nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1276 write_sequnlock(&state->seqlock);
1277 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1278 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1279 }
1280
1281 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1282 {
1283 switch (fmode) {
1284 case FMODE_READ:
1285 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1286 break;
1287 case FMODE_WRITE:
1288 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1289 break;
1290 case FMODE_READ|FMODE_WRITE:
1291 set_bit(NFS_O_RDWR_STATE, &state->flags);
1292 }
1293 if (!nfs_need_update_open_stateid(state, stateid))
1294 return;
1295 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1296 nfs4_stateid_copy(&state->stateid, stateid);
1297 nfs4_stateid_copy(&state->open_stateid, stateid);
1298 }
1299
1300 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1301 {
1302 /*
1303 * Protect the call to nfs4_state_set_mode_locked and
1304 * serialise the stateid update
1305 */
1306 write_seqlock(&state->seqlock);
1307 if (deleg_stateid != NULL) {
1308 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1309 set_bit(NFS_DELEGATED_STATE, &state->flags);
1310 }
1311 if (open_stateid != NULL)
1312 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1313 write_sequnlock(&state->seqlock);
1314 spin_lock(&state->owner->so_lock);
1315 update_open_stateflags(state, fmode);
1316 spin_unlock(&state->owner->so_lock);
1317 }
1318
1319 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1320 {
1321 struct nfs_inode *nfsi = NFS_I(state->inode);
1322 struct nfs_delegation *deleg_cur;
1323 int ret = 0;
1324
1325 fmode &= (FMODE_READ|FMODE_WRITE);
1326
1327 rcu_read_lock();
1328 deleg_cur = rcu_dereference(nfsi->delegation);
1329 if (deleg_cur == NULL)
1330 goto no_delegation;
1331
1332 spin_lock(&deleg_cur->lock);
1333 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1334 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1335 (deleg_cur->type & fmode) != fmode)
1336 goto no_delegation_unlock;
1337
1338 if (delegation == NULL)
1339 delegation = &deleg_cur->stateid;
1340 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1341 goto no_delegation_unlock;
1342
1343 nfs_mark_delegation_referenced(deleg_cur);
1344 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1345 ret = 1;
1346 no_delegation_unlock:
1347 spin_unlock(&deleg_cur->lock);
1348 no_delegation:
1349 rcu_read_unlock();
1350
1351 if (!ret && open_stateid != NULL) {
1352 __update_open_stateid(state, open_stateid, NULL, fmode);
1353 ret = 1;
1354 }
1355 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1356 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1357
1358 return ret;
1359 }
1360
1361 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1362 const nfs4_stateid *stateid)
1363 {
1364 struct nfs4_state *state = lsp->ls_state;
1365 bool ret = false;
1366
1367 spin_lock(&state->state_lock);
1368 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1369 goto out_noupdate;
1370 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1371 goto out_noupdate;
1372 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1373 ret = true;
1374 out_noupdate:
1375 spin_unlock(&state->state_lock);
1376 return ret;
1377 }
1378
1379 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1380 {
1381 struct nfs_delegation *delegation;
1382
1383 rcu_read_lock();
1384 delegation = rcu_dereference(NFS_I(inode)->delegation);
1385 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1386 rcu_read_unlock();
1387 return;
1388 }
1389 rcu_read_unlock();
1390 nfs4_inode_return_delegation(inode);
1391 }
1392
1393 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1394 {
1395 struct nfs4_state *state = opendata->state;
1396 struct nfs_inode *nfsi = NFS_I(state->inode);
1397 struct nfs_delegation *delegation;
1398 int open_mode = opendata->o_arg.open_flags;
1399 fmode_t fmode = opendata->o_arg.fmode;
1400 nfs4_stateid stateid;
1401 int ret = -EAGAIN;
1402
1403 for (;;) {
1404 spin_lock(&state->owner->so_lock);
1405 if (can_open_cached(state, fmode, open_mode)) {
1406 update_open_stateflags(state, fmode);
1407 spin_unlock(&state->owner->so_lock);
1408 goto out_return_state;
1409 }
1410 spin_unlock(&state->owner->so_lock);
1411 rcu_read_lock();
1412 delegation = rcu_dereference(nfsi->delegation);
1413 if (!can_open_delegated(delegation, fmode)) {
1414 rcu_read_unlock();
1415 break;
1416 }
1417 /* Save the delegation */
1418 nfs4_stateid_copy(&stateid, &delegation->stateid);
1419 rcu_read_unlock();
1420 nfs_release_seqid(opendata->o_arg.seqid);
1421 if (!opendata->is_recover) {
1422 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1423 if (ret != 0)
1424 goto out;
1425 }
1426 ret = -EAGAIN;
1427
1428 /* Try to update the stateid using the delegation */
1429 if (update_open_stateid(state, NULL, &stateid, fmode))
1430 goto out_return_state;
1431 }
1432 out:
1433 return ERR_PTR(ret);
1434 out_return_state:
1435 atomic_inc(&state->count);
1436 return state;
1437 }
1438
1439 static void
1440 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1441 {
1442 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1443 struct nfs_delegation *delegation;
1444 int delegation_flags = 0;
1445
1446 rcu_read_lock();
1447 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1448 if (delegation)
1449 delegation_flags = delegation->flags;
1450 rcu_read_unlock();
1451 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1452 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1453 "returning a delegation for "
1454 "OPEN(CLAIM_DELEGATE_CUR)\n",
1455 clp->cl_hostname);
1456 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1457 nfs_inode_set_delegation(state->inode,
1458 data->owner->so_cred,
1459 &data->o_res);
1460 else
1461 nfs_inode_reclaim_delegation(state->inode,
1462 data->owner->so_cred,
1463 &data->o_res);
1464 }
1465
1466 /*
1467 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1468 * and update the nfs4_state.
1469 */
1470 static struct nfs4_state *
1471 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1472 {
1473 struct inode *inode = data->state->inode;
1474 struct nfs4_state *state = data->state;
1475 int ret;
1476
1477 if (!data->rpc_done) {
1478 if (data->rpc_status) {
1479 ret = data->rpc_status;
1480 goto err;
1481 }
1482 /* cached opens have already been processed */
1483 goto update;
1484 }
1485
1486 ret = nfs_refresh_inode(inode, &data->f_attr);
1487 if (ret)
1488 goto err;
1489
1490 if (data->o_res.delegation_type != 0)
1491 nfs4_opendata_check_deleg(data, state);
1492 update:
1493 update_open_stateid(state, &data->o_res.stateid, NULL,
1494 data->o_arg.fmode);
1495 atomic_inc(&state->count);
1496
1497 return state;
1498 err:
1499 return ERR_PTR(ret);
1500
1501 }
1502
1503 static struct nfs4_state *
1504 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1505 {
1506 struct inode *inode;
1507 struct nfs4_state *state = NULL;
1508 int ret;
1509
1510 if (!data->rpc_done) {
1511 state = nfs4_try_open_cached(data);
1512 goto out;
1513 }
1514
1515 ret = -EAGAIN;
1516 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1517 goto err;
1518 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1519 ret = PTR_ERR(inode);
1520 if (IS_ERR(inode))
1521 goto err;
1522 ret = -ENOMEM;
1523 state = nfs4_get_open_state(inode, data->owner);
1524 if (state == NULL)
1525 goto err_put_inode;
1526 if (data->o_res.delegation_type != 0)
1527 nfs4_opendata_check_deleg(data, state);
1528 update_open_stateid(state, &data->o_res.stateid, NULL,
1529 data->o_arg.fmode);
1530 iput(inode);
1531 out:
1532 nfs_release_seqid(data->o_arg.seqid);
1533 return state;
1534 err_put_inode:
1535 iput(inode);
1536 err:
1537 return ERR_PTR(ret);
1538 }
1539
1540 static struct nfs4_state *
1541 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1542 {
1543 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1544 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1545 return _nfs4_opendata_to_nfs4_state(data);
1546 }
1547
1548 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1549 {
1550 struct nfs_inode *nfsi = NFS_I(state->inode);
1551 struct nfs_open_context *ctx;
1552
1553 spin_lock(&state->inode->i_lock);
1554 list_for_each_entry(ctx, &nfsi->open_files, list) {
1555 if (ctx->state != state)
1556 continue;
1557 get_nfs_open_context(ctx);
1558 spin_unlock(&state->inode->i_lock);
1559 return ctx;
1560 }
1561 spin_unlock(&state->inode->i_lock);
1562 return ERR_PTR(-ENOENT);
1563 }
1564
1565 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1566 struct nfs4_state *state, enum open_claim_type4 claim)
1567 {
1568 struct nfs4_opendata *opendata;
1569
1570 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1571 NULL, NULL, claim, GFP_NOFS);
1572 if (opendata == NULL)
1573 return ERR_PTR(-ENOMEM);
1574 opendata->state = state;
1575 atomic_inc(&state->count);
1576 return opendata;
1577 }
1578
1579 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1580 fmode_t fmode)
1581 {
1582 struct nfs4_state *newstate;
1583 int ret;
1584
1585 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1586 return 0;
1587 opendata->o_arg.open_flags = 0;
1588 opendata->o_arg.fmode = fmode;
1589 opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1590 NFS_SB(opendata->dentry->d_sb),
1591 fmode, 0);
1592 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1593 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1594 nfs4_init_opendata_res(opendata);
1595 ret = _nfs4_recover_proc_open(opendata);
1596 if (ret != 0)
1597 return ret;
1598 newstate = nfs4_opendata_to_nfs4_state(opendata);
1599 if (IS_ERR(newstate))
1600 return PTR_ERR(newstate);
1601 if (newstate != opendata->state)
1602 ret = -ESTALE;
1603 nfs4_close_state(newstate, fmode);
1604 return ret;
1605 }
1606
1607 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1608 {
1609 int ret;
1610
1611 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1612 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1613 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1614 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1615 /* memory barrier prior to reading state->n_* */
1616 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1617 clear_bit(NFS_OPEN_STATE, &state->flags);
1618 smp_rmb();
1619 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1620 if (ret != 0)
1621 return ret;
1622 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1623 if (ret != 0)
1624 return ret;
1625 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1626 if (ret != 0)
1627 return ret;
1628 /*
1629 * We may have performed cached opens for all three recoveries.
1630 * Check if we need to update the current stateid.
1631 */
1632 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1633 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1634 write_seqlock(&state->seqlock);
1635 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1636 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1637 write_sequnlock(&state->seqlock);
1638 }
1639 return 0;
1640 }
1641
1642 /*
1643 * OPEN_RECLAIM:
1644 * reclaim state on the server after a reboot.
1645 */
1646 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1647 {
1648 struct nfs_delegation *delegation;
1649 struct nfs4_opendata *opendata;
1650 fmode_t delegation_type = 0;
1651 int status;
1652
1653 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1654 NFS4_OPEN_CLAIM_PREVIOUS);
1655 if (IS_ERR(opendata))
1656 return PTR_ERR(opendata);
1657 rcu_read_lock();
1658 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1659 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1660 delegation_type = delegation->type;
1661 rcu_read_unlock();
1662 opendata->o_arg.u.delegation_type = delegation_type;
1663 status = nfs4_open_recover(opendata, state);
1664 nfs4_opendata_put(opendata);
1665 return status;
1666 }
1667
1668 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1669 {
1670 struct nfs_server *server = NFS_SERVER(state->inode);
1671 struct nfs4_exception exception = { };
1672 int err;
1673 do {
1674 err = _nfs4_do_open_reclaim(ctx, state);
1675 trace_nfs4_open_reclaim(ctx, 0, err);
1676 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1677 continue;
1678 if (err != -NFS4ERR_DELAY)
1679 break;
1680 nfs4_handle_exception(server, err, &exception);
1681 } while (exception.retry);
1682 return err;
1683 }
1684
1685 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1686 {
1687 struct nfs_open_context *ctx;
1688 int ret;
1689
1690 ctx = nfs4_state_find_open_context(state);
1691 if (IS_ERR(ctx))
1692 return -EAGAIN;
1693 ret = nfs4_do_open_reclaim(ctx, state);
1694 put_nfs_open_context(ctx);
1695 return ret;
1696 }
1697
1698 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1699 {
1700 switch (err) {
1701 default:
1702 printk(KERN_ERR "NFS: %s: unhandled error "
1703 "%d.\n", __func__, err);
1704 case 0:
1705 case -ENOENT:
1706 case -EAGAIN:
1707 case -ESTALE:
1708 break;
1709 case -NFS4ERR_BADSESSION:
1710 case -NFS4ERR_BADSLOT:
1711 case -NFS4ERR_BAD_HIGH_SLOT:
1712 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1713 case -NFS4ERR_DEADSESSION:
1714 set_bit(NFS_DELEGATED_STATE, &state->flags);
1715 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1716 return -EAGAIN;
1717 case -NFS4ERR_STALE_CLIENTID:
1718 case -NFS4ERR_STALE_STATEID:
1719 set_bit(NFS_DELEGATED_STATE, &state->flags);
1720 case -NFS4ERR_EXPIRED:
1721 /* Don't recall a delegation if it was lost */
1722 nfs4_schedule_lease_recovery(server->nfs_client);
1723 return -EAGAIN;
1724 case -NFS4ERR_MOVED:
1725 nfs4_schedule_migration_recovery(server);
1726 return -EAGAIN;
1727 case -NFS4ERR_LEASE_MOVED:
1728 nfs4_schedule_lease_moved_recovery(server->nfs_client);
1729 return -EAGAIN;
1730 case -NFS4ERR_DELEG_REVOKED:
1731 case -NFS4ERR_ADMIN_REVOKED:
1732 case -NFS4ERR_BAD_STATEID:
1733 case -NFS4ERR_OPENMODE:
1734 nfs_inode_find_state_and_recover(state->inode,
1735 stateid);
1736 nfs4_schedule_stateid_recovery(server, state);
1737 return -EAGAIN;
1738 case -NFS4ERR_DELAY:
1739 case -NFS4ERR_GRACE:
1740 set_bit(NFS_DELEGATED_STATE, &state->flags);
1741 ssleep(1);
1742 return -EAGAIN;
1743 case -ENOMEM:
1744 case -NFS4ERR_DENIED:
1745 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1746 return 0;
1747 }
1748 return err;
1749 }
1750
1751 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1752 struct nfs4_state *state, const nfs4_stateid *stateid,
1753 fmode_t type)
1754 {
1755 struct nfs_server *server = NFS_SERVER(state->inode);
1756 struct nfs4_opendata *opendata;
1757 int err = 0;
1758
1759 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1760 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1761 if (IS_ERR(opendata))
1762 return PTR_ERR(opendata);
1763 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1764 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1765 switch (type & (FMODE_READ|FMODE_WRITE)) {
1766 case FMODE_READ|FMODE_WRITE:
1767 case FMODE_WRITE:
1768 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1769 if (err)
1770 break;
1771 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1772 if (err)
1773 break;
1774 case FMODE_READ:
1775 err = nfs4_open_recover_helper(opendata, FMODE_READ);
1776 }
1777 nfs4_opendata_put(opendata);
1778 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1779 }
1780
1781 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1782 {
1783 struct nfs4_opendata *data = calldata;
1784
1785 nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1786 &data->c_arg.seq_args, &data->c_res.seq_res, task);
1787 }
1788
1789 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1790 {
1791 struct nfs4_opendata *data = calldata;
1792
1793 nfs40_sequence_done(task, &data->c_res.seq_res);
1794
1795 data->rpc_status = task->tk_status;
1796 if (data->rpc_status == 0) {
1797 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1798 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1799 renew_lease(data->o_res.server, data->timestamp);
1800 data->rpc_done = 1;
1801 }
1802 }
1803
1804 static void nfs4_open_confirm_release(void *calldata)
1805 {
1806 struct nfs4_opendata *data = calldata;
1807 struct nfs4_state *state = NULL;
1808
1809 /* If this request hasn't been cancelled, do nothing */
1810 if (data->cancelled == 0)
1811 goto out_free;
1812 /* In case of error, no cleanup! */
1813 if (!data->rpc_done)
1814 goto out_free;
1815 state = nfs4_opendata_to_nfs4_state(data);
1816 if (!IS_ERR(state))
1817 nfs4_close_state(state, data->o_arg.fmode);
1818 out_free:
1819 nfs4_opendata_put(data);
1820 }
1821
1822 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1823 .rpc_call_prepare = nfs4_open_confirm_prepare,
1824 .rpc_call_done = nfs4_open_confirm_done,
1825 .rpc_release = nfs4_open_confirm_release,
1826 };
1827
1828 /*
1829 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1830 */
1831 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1832 {
1833 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1834 struct rpc_task *task;
1835 struct rpc_message msg = {
1836 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1837 .rpc_argp = &data->c_arg,
1838 .rpc_resp = &data->c_res,
1839 .rpc_cred = data->owner->so_cred,
1840 };
1841 struct rpc_task_setup task_setup_data = {
1842 .rpc_client = server->client,
1843 .rpc_message = &msg,
1844 .callback_ops = &nfs4_open_confirm_ops,
1845 .callback_data = data,
1846 .workqueue = nfsiod_workqueue,
1847 .flags = RPC_TASK_ASYNC,
1848 };
1849 int status;
1850
1851 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1852 kref_get(&data->kref);
1853 data->rpc_done = 0;
1854 data->rpc_status = 0;
1855 data->timestamp = jiffies;
1856 task = rpc_run_task(&task_setup_data);
1857 if (IS_ERR(task))
1858 return PTR_ERR(task);
1859 status = nfs4_wait_for_completion_rpc_task(task);
1860 if (status != 0) {
1861 data->cancelled = 1;
1862 smp_wmb();
1863 } else
1864 status = data->rpc_status;
1865 rpc_put_task(task);
1866 return status;
1867 }
1868
1869 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1870 {
1871 struct nfs4_opendata *data = calldata;
1872 struct nfs4_state_owner *sp = data->owner;
1873 struct nfs_client *clp = sp->so_server->nfs_client;
1874
1875 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1876 goto out_wait;
1877 /*
1878 * Check if we still need to send an OPEN call, or if we can use
1879 * a delegation instead.
1880 */
1881 if (data->state != NULL) {
1882 struct nfs_delegation *delegation;
1883
1884 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1885 goto out_no_action;
1886 rcu_read_lock();
1887 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1888 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1889 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1890 can_open_delegated(delegation, data->o_arg.fmode))
1891 goto unlock_no_action;
1892 rcu_read_unlock();
1893 }
1894 /* Update client id. */
1895 data->o_arg.clientid = clp->cl_clientid;
1896 switch (data->o_arg.claim) {
1897 case NFS4_OPEN_CLAIM_PREVIOUS:
1898 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1899 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1900 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1901 case NFS4_OPEN_CLAIM_FH:
1902 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1903 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1904 }
1905 data->timestamp = jiffies;
1906 if (nfs4_setup_sequence(data->o_arg.server,
1907 &data->o_arg.seq_args,
1908 &data->o_res.seq_res,
1909 task) != 0)
1910 nfs_release_seqid(data->o_arg.seqid);
1911
1912 /* Set the create mode (note dependency on the session type) */
1913 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1914 if (data->o_arg.open_flags & O_EXCL) {
1915 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1916 if (nfs4_has_persistent_session(clp))
1917 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1918 else if (clp->cl_mvops->minor_version > 0)
1919 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1920 }
1921 return;
1922 unlock_no_action:
1923 rcu_read_unlock();
1924 out_no_action:
1925 task->tk_action = NULL;
1926 out_wait:
1927 nfs4_sequence_done(task, &data->o_res.seq_res);
1928 }
1929
1930 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1931 {
1932 struct nfs4_opendata *data = calldata;
1933
1934 data->rpc_status = task->tk_status;
1935
1936 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1937 return;
1938
1939 if (task->tk_status == 0) {
1940 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1941 switch (data->o_res.f_attr->mode & S_IFMT) {
1942 case S_IFREG:
1943 break;
1944 case S_IFLNK:
1945 data->rpc_status = -ELOOP;
1946 break;
1947 case S_IFDIR:
1948 data->rpc_status = -EISDIR;
1949 break;
1950 default:
1951 data->rpc_status = -ENOTDIR;
1952 }
1953 }
1954 renew_lease(data->o_res.server, data->timestamp);
1955 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1956 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1957 }
1958 data->rpc_done = 1;
1959 }
1960
1961 static void nfs4_open_release(void *calldata)
1962 {
1963 struct nfs4_opendata *data = calldata;
1964 struct nfs4_state *state = NULL;
1965
1966 /* If this request hasn't been cancelled, do nothing */
1967 if (data->cancelled == 0)
1968 goto out_free;
1969 /* In case of error, no cleanup! */
1970 if (data->rpc_status != 0 || !data->rpc_done)
1971 goto out_free;
1972 /* In case we need an open_confirm, no cleanup! */
1973 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1974 goto out_free;
1975 state = nfs4_opendata_to_nfs4_state(data);
1976 if (!IS_ERR(state))
1977 nfs4_close_state(state, data->o_arg.fmode);
1978 out_free:
1979 nfs4_opendata_put(data);
1980 }
1981
1982 static const struct rpc_call_ops nfs4_open_ops = {
1983 .rpc_call_prepare = nfs4_open_prepare,
1984 .rpc_call_done = nfs4_open_done,
1985 .rpc_release = nfs4_open_release,
1986 };
1987
1988 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1989 {
1990 struct inode *dir = d_inode(data->dir);
1991 struct nfs_server *server = NFS_SERVER(dir);
1992 struct nfs_openargs *o_arg = &data->o_arg;
1993 struct nfs_openres *o_res = &data->o_res;
1994 struct rpc_task *task;
1995 struct rpc_message msg = {
1996 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1997 .rpc_argp = o_arg,
1998 .rpc_resp = o_res,
1999 .rpc_cred = data->owner->so_cred,
2000 };
2001 struct rpc_task_setup task_setup_data = {
2002 .rpc_client = server->client,
2003 .rpc_message = &msg,
2004 .callback_ops = &nfs4_open_ops,
2005 .callback_data = data,
2006 .workqueue = nfsiod_workqueue,
2007 .flags = RPC_TASK_ASYNC,
2008 };
2009 int status;
2010
2011 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2012 kref_get(&data->kref);
2013 data->rpc_done = 0;
2014 data->rpc_status = 0;
2015 data->cancelled = 0;
2016 data->is_recover = 0;
2017 if (isrecover) {
2018 nfs4_set_sequence_privileged(&o_arg->seq_args);
2019 data->is_recover = 1;
2020 }
2021 task = rpc_run_task(&task_setup_data);
2022 if (IS_ERR(task))
2023 return PTR_ERR(task);
2024 status = nfs4_wait_for_completion_rpc_task(task);
2025 if (status != 0) {
2026 data->cancelled = 1;
2027 smp_wmb();
2028 } else
2029 status = data->rpc_status;
2030 rpc_put_task(task);
2031
2032 return status;
2033 }
2034
2035 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2036 {
2037 struct inode *dir = d_inode(data->dir);
2038 struct nfs_openres *o_res = &data->o_res;
2039 int status;
2040
2041 status = nfs4_run_open_task(data, 1);
2042 if (status != 0 || !data->rpc_done)
2043 return status;
2044
2045 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2046
2047 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2048 status = _nfs4_proc_open_confirm(data);
2049 if (status != 0)
2050 return status;
2051 }
2052
2053 return status;
2054 }
2055
2056 /*
2057 * Additional permission checks in order to distinguish between an
2058 * open for read, and an open for execute. This works around the
2059 * fact that NFSv4 OPEN treats read and execute permissions as being
2060 * the same.
2061 * Note that in the non-execute case, we want to turn off permission
2062 * checking if we just created a new file (POSIX open() semantics).
2063 */
2064 static int nfs4_opendata_access(struct rpc_cred *cred,
2065 struct nfs4_opendata *opendata,
2066 struct nfs4_state *state, fmode_t fmode,
2067 int openflags)
2068 {
2069 struct nfs_access_entry cache;
2070 u32 mask;
2071
2072 /* access call failed or for some reason the server doesn't
2073 * support any access modes -- defer access call until later */
2074 if (opendata->o_res.access_supported == 0)
2075 return 0;
2076
2077 mask = 0;
2078 /*
2079 * Use openflags to check for exec, because fmode won't
2080 * always have FMODE_EXEC set when file open for exec.
2081 */
2082 if (openflags & __FMODE_EXEC) {
2083 /* ONLY check for exec rights */
2084 mask = MAY_EXEC;
2085 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2086 mask = MAY_READ;
2087
2088 cache.cred = cred;
2089 cache.jiffies = jiffies;
2090 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2091 nfs_access_add_cache(state->inode, &cache);
2092
2093 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2094 return 0;
2095
2096 /* even though OPEN succeeded, access is denied. Close the file */
2097 nfs4_close_state(state, fmode);
2098 return -EACCES;
2099 }
2100
2101 /*
2102 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2103 */
2104 static int _nfs4_proc_open(struct nfs4_opendata *data)
2105 {
2106 struct inode *dir = d_inode(data->dir);
2107 struct nfs_server *server = NFS_SERVER(dir);
2108 struct nfs_openargs *o_arg = &data->o_arg;
2109 struct nfs_openres *o_res = &data->o_res;
2110 int status;
2111
2112 status = nfs4_run_open_task(data, 0);
2113 if (!data->rpc_done)
2114 return status;
2115 if (status != 0) {
2116 if (status == -NFS4ERR_BADNAME &&
2117 !(o_arg->open_flags & O_CREAT))
2118 return -ENOENT;
2119 return status;
2120 }
2121
2122 nfs_fattr_map_and_free_names(server, &data->f_attr);
2123
2124 if (o_arg->open_flags & O_CREAT) {
2125 update_changeattr(dir, &o_res->cinfo);
2126 if (o_arg->open_flags & O_EXCL)
2127 data->file_created = 1;
2128 else if (o_res->cinfo.before != o_res->cinfo.after)
2129 data->file_created = 1;
2130 }
2131 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2132 server->caps &= ~NFS_CAP_POSIX_LOCK;
2133 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2134 status = _nfs4_proc_open_confirm(data);
2135 if (status != 0)
2136 return status;
2137 }
2138 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2139 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2140 return 0;
2141 }
2142
2143 static int nfs4_recover_expired_lease(struct nfs_server *server)
2144 {
2145 return nfs4_client_recover_expired_lease(server->nfs_client);
2146 }
2147
2148 /*
2149 * OPEN_EXPIRED:
2150 * reclaim state on the server after a network partition.
2151 * Assumes caller holds the appropriate lock
2152 */
2153 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2154 {
2155 struct nfs4_opendata *opendata;
2156 int ret;
2157
2158 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2159 NFS4_OPEN_CLAIM_FH);
2160 if (IS_ERR(opendata))
2161 return PTR_ERR(opendata);
2162 ret = nfs4_open_recover(opendata, state);
2163 if (ret == -ESTALE)
2164 d_drop(ctx->dentry);
2165 nfs4_opendata_put(opendata);
2166 return ret;
2167 }
2168
2169 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2170 {
2171 struct nfs_server *server = NFS_SERVER(state->inode);
2172 struct nfs4_exception exception = { };
2173 int err;
2174
2175 do {
2176 err = _nfs4_open_expired(ctx, state);
2177 trace_nfs4_open_expired(ctx, 0, err);
2178 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2179 continue;
2180 switch (err) {
2181 default:
2182 goto out;
2183 case -NFS4ERR_GRACE:
2184 case -NFS4ERR_DELAY:
2185 nfs4_handle_exception(server, err, &exception);
2186 err = 0;
2187 }
2188 } while (exception.retry);
2189 out:
2190 return err;
2191 }
2192
2193 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2194 {
2195 struct nfs_open_context *ctx;
2196 int ret;
2197
2198 ctx = nfs4_state_find_open_context(state);
2199 if (IS_ERR(ctx))
2200 return -EAGAIN;
2201 ret = nfs4_do_open_expired(ctx, state);
2202 put_nfs_open_context(ctx);
2203 return ret;
2204 }
2205
2206 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2207 {
2208 nfs_remove_bad_delegation(state->inode);
2209 write_seqlock(&state->seqlock);
2210 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2211 write_sequnlock(&state->seqlock);
2212 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2213 }
2214
2215 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2216 {
2217 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2218 nfs_finish_clear_delegation_stateid(state);
2219 }
2220
2221 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2222 {
2223 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2224 nfs40_clear_delegation_stateid(state);
2225 return nfs4_open_expired(sp, state);
2226 }
2227
2228 #if defined(CONFIG_NFS_V4_1)
2229 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2230 {
2231 struct nfs_server *server = NFS_SERVER(state->inode);
2232 nfs4_stateid stateid;
2233 struct nfs_delegation *delegation;
2234 struct rpc_cred *cred;
2235 int status;
2236
2237 /* Get the delegation credential for use by test/free_stateid */
2238 rcu_read_lock();
2239 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2240 if (delegation == NULL) {
2241 rcu_read_unlock();
2242 return;
2243 }
2244
2245 nfs4_stateid_copy(&stateid, &delegation->stateid);
2246 cred = get_rpccred(delegation->cred);
2247 rcu_read_unlock();
2248 status = nfs41_test_stateid(server, &stateid, cred);
2249 trace_nfs4_test_delegation_stateid(state, NULL, status);
2250
2251 if (status != NFS_OK) {
2252 /* Free the stateid unless the server explicitly
2253 * informs us the stateid is unrecognized. */
2254 if (status != -NFS4ERR_BAD_STATEID)
2255 nfs41_free_stateid(server, &stateid, cred);
2256 nfs_finish_clear_delegation_stateid(state);
2257 }
2258
2259 put_rpccred(cred);
2260 }
2261
2262 /**
2263 * nfs41_check_open_stateid - possibly free an open stateid
2264 *
2265 * @state: NFSv4 state for an inode
2266 *
2267 * Returns NFS_OK if recovery for this stateid is now finished.
2268 * Otherwise a negative NFS4ERR value is returned.
2269 */
2270 static int nfs41_check_open_stateid(struct nfs4_state *state)
2271 {
2272 struct nfs_server *server = NFS_SERVER(state->inode);
2273 nfs4_stateid *stateid = &state->open_stateid;
2274 struct rpc_cred *cred = state->owner->so_cred;
2275 int status;
2276
2277 /* If a state reset has been done, test_stateid is unneeded */
2278 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2279 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2280 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2281 return -NFS4ERR_BAD_STATEID;
2282
2283 status = nfs41_test_stateid(server, stateid, cred);
2284 trace_nfs4_test_open_stateid(state, NULL, status);
2285 if (status != NFS_OK) {
2286 /* Free the stateid unless the server explicitly
2287 * informs us the stateid is unrecognized. */
2288 if (status != -NFS4ERR_BAD_STATEID)
2289 nfs41_free_stateid(server, stateid, cred);
2290
2291 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2292 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2293 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2294 clear_bit(NFS_OPEN_STATE, &state->flags);
2295 }
2296 return status;
2297 }
2298
2299 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2300 {
2301 int status;
2302
2303 nfs41_check_delegation_stateid(state);
2304 status = nfs41_check_open_stateid(state);
2305 if (status != NFS_OK)
2306 status = nfs4_open_expired(sp, state);
2307 return status;
2308 }
2309 #endif
2310
2311 /*
2312 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2313 * fields corresponding to attributes that were used to store the verifier.
2314 * Make sure we clobber those fields in the later setattr call
2315 */
2316 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2317 {
2318 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2319 !(sattr->ia_valid & ATTR_ATIME_SET))
2320 sattr->ia_valid |= ATTR_ATIME;
2321
2322 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2323 !(sattr->ia_valid & ATTR_MTIME_SET))
2324 sattr->ia_valid |= ATTR_MTIME;
2325 }
2326
2327 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2328 fmode_t fmode,
2329 int flags,
2330 struct nfs_open_context *ctx)
2331 {
2332 struct nfs4_state_owner *sp = opendata->owner;
2333 struct nfs_server *server = sp->so_server;
2334 struct dentry *dentry;
2335 struct nfs4_state *state;
2336 unsigned int seq;
2337 int ret;
2338
2339 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2340
2341 ret = _nfs4_proc_open(opendata);
2342 if (ret != 0)
2343 goto out;
2344
2345 state = nfs4_opendata_to_nfs4_state(opendata);
2346 ret = PTR_ERR(state);
2347 if (IS_ERR(state))
2348 goto out;
2349 if (server->caps & NFS_CAP_POSIX_LOCK)
2350 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2351
2352 dentry = opendata->dentry;
2353 if (d_really_is_negative(dentry)) {
2354 /* FIXME: Is this d_drop() ever needed? */
2355 d_drop(dentry);
2356 dentry = d_add_unique(dentry, igrab(state->inode));
2357 if (dentry == NULL) {
2358 dentry = opendata->dentry;
2359 } else if (dentry != ctx->dentry) {
2360 dput(ctx->dentry);
2361 ctx->dentry = dget(dentry);
2362 }
2363 nfs_set_verifier(dentry,
2364 nfs_save_change_attribute(d_inode(opendata->dir)));
2365 }
2366
2367 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2368 if (ret != 0)
2369 goto out;
2370
2371 ctx->state = state;
2372 if (d_inode(dentry) == state->inode) {
2373 nfs_inode_attach_open_context(ctx);
2374 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2375 nfs4_schedule_stateid_recovery(server, state);
2376 }
2377 out:
2378 return ret;
2379 }
2380
2381 /*
2382 * Returns a referenced nfs4_state
2383 */
2384 static int _nfs4_do_open(struct inode *dir,
2385 struct nfs_open_context *ctx,
2386 int flags,
2387 struct iattr *sattr,
2388 struct nfs4_label *label,
2389 int *opened)
2390 {
2391 struct nfs4_state_owner *sp;
2392 struct nfs4_state *state = NULL;
2393 struct nfs_server *server = NFS_SERVER(dir);
2394 struct nfs4_opendata *opendata;
2395 struct dentry *dentry = ctx->dentry;
2396 struct rpc_cred *cred = ctx->cred;
2397 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2398 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2399 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2400 struct nfs4_label *olabel = NULL;
2401 int status;
2402
2403 /* Protect against reboot recovery conflicts */
2404 status = -ENOMEM;
2405 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2406 if (sp == NULL) {
2407 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2408 goto out_err;
2409 }
2410 status = nfs4_recover_expired_lease(server);
2411 if (status != 0)
2412 goto err_put_state_owner;
2413 if (d_really_is_positive(dentry))
2414 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2415 status = -ENOMEM;
2416 if (d_really_is_positive(dentry))
2417 claim = NFS4_OPEN_CLAIM_FH;
2418 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2419 label, claim, GFP_KERNEL);
2420 if (opendata == NULL)
2421 goto err_put_state_owner;
2422
2423 if (label) {
2424 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2425 if (IS_ERR(olabel)) {
2426 status = PTR_ERR(olabel);
2427 goto err_opendata_put;
2428 }
2429 }
2430
2431 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2432 if (!opendata->f_attr.mdsthreshold) {
2433 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2434 if (!opendata->f_attr.mdsthreshold)
2435 goto err_free_label;
2436 }
2437 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2438 }
2439 if (d_really_is_positive(dentry))
2440 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2441
2442 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2443 if (status != 0)
2444 goto err_free_label;
2445 state = ctx->state;
2446
2447 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2448 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2449 nfs4_exclusive_attrset(opendata, sattr);
2450
2451 nfs_fattr_init(opendata->o_res.f_attr);
2452 status = nfs4_do_setattr(state->inode, cred,
2453 opendata->o_res.f_attr, sattr,
2454 state, label, olabel);
2455 if (status == 0) {
2456 nfs_setattr_update_inode(state->inode, sattr,
2457 opendata->o_res.f_attr);
2458 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2459 }
2460 }
2461 if (opendata->file_created)
2462 *opened |= FILE_CREATED;
2463
2464 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2465 *ctx_th = opendata->f_attr.mdsthreshold;
2466 opendata->f_attr.mdsthreshold = NULL;
2467 }
2468
2469 nfs4_label_free(olabel);
2470
2471 nfs4_opendata_put(opendata);
2472 nfs4_put_state_owner(sp);
2473 return 0;
2474 err_free_label:
2475 nfs4_label_free(olabel);
2476 err_opendata_put:
2477 nfs4_opendata_put(opendata);
2478 err_put_state_owner:
2479 nfs4_put_state_owner(sp);
2480 out_err:
2481 return status;
2482 }
2483
2484
2485 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2486 struct nfs_open_context *ctx,
2487 int flags,
2488 struct iattr *sattr,
2489 struct nfs4_label *label,
2490 int *opened)
2491 {
2492 struct nfs_server *server = NFS_SERVER(dir);
2493 struct nfs4_exception exception = { };
2494 struct nfs4_state *res;
2495 int status;
2496
2497 do {
2498 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2499 res = ctx->state;
2500 trace_nfs4_open_file(ctx, flags, status);
2501 if (status == 0)
2502 break;
2503 /* NOTE: BAD_SEQID means the server and client disagree about the
2504 * book-keeping w.r.t. state-changing operations
2505 * (OPEN/CLOSE/LOCK/LOCKU...)
2506 * It is actually a sign of a bug on the client or on the server.
2507 *
2508 * If we receive a BAD_SEQID error in the particular case of
2509 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2510 * have unhashed the old state_owner for us, and that we can
2511 * therefore safely retry using a new one. We should still warn
2512 * the user though...
2513 */
2514 if (status == -NFS4ERR_BAD_SEQID) {
2515 pr_warn_ratelimited("NFS: v4 server %s "
2516 " returned a bad sequence-id error!\n",
2517 NFS_SERVER(dir)->nfs_client->cl_hostname);
2518 exception.retry = 1;
2519 continue;
2520 }
2521 /*
2522 * BAD_STATEID on OPEN means that the server cancelled our
2523 * state before it received the OPEN_CONFIRM.
2524 * Recover by retrying the request as per the discussion
2525 * on Page 181 of RFC3530.
2526 */
2527 if (status == -NFS4ERR_BAD_STATEID) {
2528 exception.retry = 1;
2529 continue;
2530 }
2531 if (status == -EAGAIN) {
2532 /* We must have found a delegation */
2533 exception.retry = 1;
2534 continue;
2535 }
2536 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2537 continue;
2538 res = ERR_PTR(nfs4_handle_exception(server,
2539 status, &exception));
2540 } while (exception.retry);
2541 return res;
2542 }
2543
2544 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2545 struct nfs_fattr *fattr, struct iattr *sattr,
2546 struct nfs4_state *state, struct nfs4_label *ilabel,
2547 struct nfs4_label *olabel)
2548 {
2549 struct nfs_server *server = NFS_SERVER(inode);
2550 struct nfs_setattrargs arg = {
2551 .fh = NFS_FH(inode),
2552 .iap = sattr,
2553 .server = server,
2554 .bitmask = server->attr_bitmask,
2555 .label = ilabel,
2556 };
2557 struct nfs_setattrres res = {
2558 .fattr = fattr,
2559 .label = olabel,
2560 .server = server,
2561 };
2562 struct rpc_message msg = {
2563 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2564 .rpc_argp = &arg,
2565 .rpc_resp = &res,
2566 .rpc_cred = cred,
2567 };
2568 unsigned long timestamp = jiffies;
2569 fmode_t fmode;
2570 bool truncate;
2571 int status;
2572
2573 arg.bitmask = nfs4_bitmask(server, ilabel);
2574 if (ilabel)
2575 arg.bitmask = nfs4_bitmask(server, olabel);
2576
2577 nfs_fattr_init(fattr);
2578
2579 /* Servers should only apply open mode checks for file size changes */
2580 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2581 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2582
2583 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2584 /* Use that stateid */
2585 } else if (truncate && state != NULL) {
2586 struct nfs_lockowner lockowner = {
2587 .l_owner = current->files,
2588 .l_pid = current->tgid,
2589 };
2590 if (!nfs4_valid_open_stateid(state))
2591 return -EBADF;
2592 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2593 &lockowner) == -EIO)
2594 return -EBADF;
2595 } else
2596 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2597
2598 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2599 if (status == 0 && state != NULL)
2600 renew_lease(server, timestamp);
2601 return status;
2602 }
2603
2604 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2605 struct nfs_fattr *fattr, struct iattr *sattr,
2606 struct nfs4_state *state, struct nfs4_label *ilabel,
2607 struct nfs4_label *olabel)
2608 {
2609 struct nfs_server *server = NFS_SERVER(inode);
2610 struct nfs4_exception exception = {
2611 .state = state,
2612 .inode = inode,
2613 };
2614 int err;
2615 do {
2616 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2617 trace_nfs4_setattr(inode, err);
2618 switch (err) {
2619 case -NFS4ERR_OPENMODE:
2620 if (!(sattr->ia_valid & ATTR_SIZE)) {
2621 pr_warn_once("NFSv4: server %s is incorrectly "
2622 "applying open mode checks to "
2623 "a SETATTR that is not "
2624 "changing file size.\n",
2625 server->nfs_client->cl_hostname);
2626 }
2627 if (state && !(state->state & FMODE_WRITE)) {
2628 err = -EBADF;
2629 if (sattr->ia_valid & ATTR_OPEN)
2630 err = -EACCES;
2631 goto out;
2632 }
2633 }
2634 err = nfs4_handle_exception(server, err, &exception);
2635 } while (exception.retry);
2636 out:
2637 return err;
2638 }
2639
2640 struct nfs4_closedata {
2641 struct inode *inode;
2642 struct nfs4_state *state;
2643 struct nfs_closeargs arg;
2644 struct nfs_closeres res;
2645 struct nfs_fattr fattr;
2646 unsigned long timestamp;
2647 bool roc;
2648 u32 roc_barrier;
2649 };
2650
2651 static void nfs4_free_closedata(void *data)
2652 {
2653 struct nfs4_closedata *calldata = data;
2654 struct nfs4_state_owner *sp = calldata->state->owner;
2655 struct super_block *sb = calldata->state->inode->i_sb;
2656
2657 if (calldata->roc)
2658 pnfs_roc_release(calldata->state->inode);
2659 nfs4_put_open_state(calldata->state);
2660 nfs_free_seqid(calldata->arg.seqid);
2661 nfs4_put_state_owner(sp);
2662 nfs_sb_deactive(sb);
2663 kfree(calldata);
2664 }
2665
2666 static void nfs4_close_done(struct rpc_task *task, void *data)
2667 {
2668 struct nfs4_closedata *calldata = data;
2669 struct nfs4_state *state = calldata->state;
2670 struct nfs_server *server = NFS_SERVER(calldata->inode);
2671 nfs4_stateid *res_stateid = NULL;
2672
2673 dprintk("%s: begin!\n", __func__);
2674 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2675 return;
2676 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2677 /* hmm. we are done with the inode, and in the process of freeing
2678 * the state_owner. we keep this around to process errors
2679 */
2680 switch (task->tk_status) {
2681 case 0:
2682 res_stateid = &calldata->res.stateid;
2683 if (calldata->arg.fmode == 0 && calldata->roc)
2684 pnfs_roc_set_barrier(state->inode,
2685 calldata->roc_barrier);
2686 renew_lease(server, calldata->timestamp);
2687 break;
2688 case -NFS4ERR_ADMIN_REVOKED:
2689 case -NFS4ERR_STALE_STATEID:
2690 case -NFS4ERR_OLD_STATEID:
2691 case -NFS4ERR_BAD_STATEID:
2692 case -NFS4ERR_EXPIRED:
2693 if (!nfs4_stateid_match(&calldata->arg.stateid,
2694 &state->open_stateid)) {
2695 rpc_restart_call_prepare(task);
2696 goto out_release;
2697 }
2698 if (calldata->arg.fmode == 0)
2699 break;
2700 default:
2701 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2702 rpc_restart_call_prepare(task);
2703 goto out_release;
2704 }
2705 }
2706 nfs_clear_open_stateid(state, &calldata->arg.stateid,
2707 res_stateid, calldata->arg.fmode);
2708 out_release:
2709 nfs_release_seqid(calldata->arg.seqid);
2710 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2711 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2712 }
2713
2714 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2715 {
2716 struct nfs4_closedata *calldata = data;
2717 struct nfs4_state *state = calldata->state;
2718 struct inode *inode = calldata->inode;
2719 bool is_rdonly, is_wronly, is_rdwr;
2720 int call_close = 0;
2721
2722 dprintk("%s: begin!\n", __func__);
2723 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2724 goto out_wait;
2725
2726 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2727 spin_lock(&state->owner->so_lock);
2728 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2729 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2730 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2731 nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2732 /* Calculate the change in open mode */
2733 calldata->arg.fmode = 0;
2734 if (state->n_rdwr == 0) {
2735 if (state->n_rdonly == 0)
2736 call_close |= is_rdonly;
2737 else if (is_rdonly)
2738 calldata->arg.fmode |= FMODE_READ;
2739 if (state->n_wronly == 0)
2740 call_close |= is_wronly;
2741 else if (is_wronly)
2742 calldata->arg.fmode |= FMODE_WRITE;
2743 } else if (is_rdwr)
2744 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2745
2746 if (calldata->arg.fmode == 0)
2747 call_close |= is_rdwr;
2748
2749 if (!nfs4_valid_open_stateid(state))
2750 call_close = 0;
2751 spin_unlock(&state->owner->so_lock);
2752
2753 if (!call_close) {
2754 /* Note: exit _without_ calling nfs4_close_done */
2755 goto out_no_action;
2756 }
2757
2758 if (calldata->arg.fmode == 0) {
2759 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2760 if (calldata->roc &&
2761 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2762 nfs_release_seqid(calldata->arg.seqid);
2763 goto out_wait;
2764 }
2765 }
2766 calldata->arg.share_access =
2767 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2768 calldata->arg.fmode, 0);
2769
2770 nfs_fattr_init(calldata->res.fattr);
2771 calldata->timestamp = jiffies;
2772 if (nfs4_setup_sequence(NFS_SERVER(inode),
2773 &calldata->arg.seq_args,
2774 &calldata->res.seq_res,
2775 task) != 0)
2776 nfs_release_seqid(calldata->arg.seqid);
2777 dprintk("%s: done!\n", __func__);
2778 return;
2779 out_no_action:
2780 task->tk_action = NULL;
2781 out_wait:
2782 nfs4_sequence_done(task, &calldata->res.seq_res);
2783 }
2784
2785 static const struct rpc_call_ops nfs4_close_ops = {
2786 .rpc_call_prepare = nfs4_close_prepare,
2787 .rpc_call_done = nfs4_close_done,
2788 .rpc_release = nfs4_free_closedata,
2789 };
2790
2791 static bool nfs4_roc(struct inode *inode)
2792 {
2793 if (!nfs_have_layout(inode))
2794 return false;
2795 return pnfs_roc(inode);
2796 }
2797
2798 /*
2799 * It is possible for data to be read/written from a mem-mapped file
2800 * after the sys_close call (which hits the vfs layer as a flush).
2801 * This means that we can't safely call nfsv4 close on a file until
2802 * the inode is cleared. This in turn means that we are not good
2803 * NFSv4 citizens - we do not indicate to the server to update the file's
2804 * share state even when we are done with one of the three share
2805 * stateid's in the inode.
2806 *
2807 * NOTE: Caller must be holding the sp->so_owner semaphore!
2808 */
2809 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2810 {
2811 struct nfs_server *server = NFS_SERVER(state->inode);
2812 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2813 struct nfs4_closedata *calldata;
2814 struct nfs4_state_owner *sp = state->owner;
2815 struct rpc_task *task;
2816 struct rpc_message msg = {
2817 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2818 .rpc_cred = state->owner->so_cred,
2819 };
2820 struct rpc_task_setup task_setup_data = {
2821 .rpc_client = server->client,
2822 .rpc_message = &msg,
2823 .callback_ops = &nfs4_close_ops,
2824 .workqueue = nfsiod_workqueue,
2825 .flags = RPC_TASK_ASYNC,
2826 };
2827 int status = -ENOMEM;
2828
2829 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2830 &task_setup_data.rpc_client, &msg);
2831
2832 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2833 if (calldata == NULL)
2834 goto out;
2835 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2836 calldata->inode = state->inode;
2837 calldata->state = state;
2838 calldata->arg.fh = NFS_FH(state->inode);
2839 /* Serialization for the sequence id */
2840 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2841 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2842 if (IS_ERR(calldata->arg.seqid))
2843 goto out_free_calldata;
2844 calldata->arg.fmode = 0;
2845 calldata->arg.bitmask = server->cache_consistency_bitmask;
2846 calldata->res.fattr = &calldata->fattr;
2847 calldata->res.seqid = calldata->arg.seqid;
2848 calldata->res.server = server;
2849 calldata->roc = nfs4_roc(state->inode);
2850 nfs_sb_active(calldata->inode->i_sb);
2851
2852 msg.rpc_argp = &calldata->arg;
2853 msg.rpc_resp = &calldata->res;
2854 task_setup_data.callback_data = calldata;
2855 task = rpc_run_task(&task_setup_data);
2856 if (IS_ERR(task))
2857 return PTR_ERR(task);
2858 status = 0;
2859 if (wait)
2860 status = rpc_wait_for_completion_task(task);
2861 rpc_put_task(task);
2862 return status;
2863 out_free_calldata:
2864 kfree(calldata);
2865 out:
2866 nfs4_put_open_state(state);
2867 nfs4_put_state_owner(sp);
2868 return status;
2869 }
2870
2871 static struct inode *
2872 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2873 int open_flags, struct iattr *attr, int *opened)
2874 {
2875 struct nfs4_state *state;
2876 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2877
2878 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2879
2880 /* Protect against concurrent sillydeletes */
2881 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2882
2883 nfs4_label_release_security(label);
2884
2885 if (IS_ERR(state))
2886 return ERR_CAST(state);
2887 return state->inode;
2888 }
2889
2890 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2891 {
2892 if (ctx->state == NULL)
2893 return;
2894 if (is_sync)
2895 nfs4_close_sync(ctx->state, ctx->mode);
2896 else
2897 nfs4_close_state(ctx->state, ctx->mode);
2898 }
2899
2900 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2901 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2902 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2903
2904 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2905 {
2906 struct nfs4_server_caps_arg args = {
2907 .fhandle = fhandle,
2908 };
2909 struct nfs4_server_caps_res res = {};
2910 struct rpc_message msg = {
2911 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2912 .rpc_argp = &args,
2913 .rpc_resp = &res,
2914 };
2915 int status;
2916
2917 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2918 if (status == 0) {
2919 /* Sanity check the server answers */
2920 switch (server->nfs_client->cl_minorversion) {
2921 case 0:
2922 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2923 res.attr_bitmask[2] = 0;
2924 break;
2925 case 1:
2926 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2927 break;
2928 case 2:
2929 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2930 }
2931 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2932 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2933 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2934 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2935 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2936 NFS_CAP_CTIME|NFS_CAP_MTIME|
2937 NFS_CAP_SECURITY_LABEL);
2938 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2939 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2940 server->caps |= NFS_CAP_ACLS;
2941 if (res.has_links != 0)
2942 server->caps |= NFS_CAP_HARDLINKS;
2943 if (res.has_symlinks != 0)
2944 server->caps |= NFS_CAP_SYMLINKS;
2945 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2946 server->caps |= NFS_CAP_FILEID;
2947 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2948 server->caps |= NFS_CAP_MODE;
2949 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2950 server->caps |= NFS_CAP_NLINK;
2951 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2952 server->caps |= NFS_CAP_OWNER;
2953 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2954 server->caps |= NFS_CAP_OWNER_GROUP;
2955 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2956 server->caps |= NFS_CAP_ATIME;
2957 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2958 server->caps |= NFS_CAP_CTIME;
2959 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2960 server->caps |= NFS_CAP_MTIME;
2961 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2962 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2963 server->caps |= NFS_CAP_SECURITY_LABEL;
2964 #endif
2965 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2966 sizeof(server->attr_bitmask));
2967 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2968
2969 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2970 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2971 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2972 server->cache_consistency_bitmask[2] = 0;
2973 server->acl_bitmask = res.acl_bitmask;
2974 server->fh_expire_type = res.fh_expire_type;
2975 }
2976
2977 return status;
2978 }
2979
2980 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2981 {
2982 struct nfs4_exception exception = { };
2983 int err;
2984 do {
2985 err = nfs4_handle_exception(server,
2986 _nfs4_server_capabilities(server, fhandle),
2987 &exception);
2988 } while (exception.retry);
2989 return err;
2990 }
2991
2992 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2993 struct nfs_fsinfo *info)
2994 {
2995 u32 bitmask[3];
2996 struct nfs4_lookup_root_arg args = {
2997 .bitmask = bitmask,
2998 };
2999 struct nfs4_lookup_res res = {
3000 .server = server,
3001 .fattr = info->fattr,
3002 .fh = fhandle,
3003 };
3004 struct rpc_message msg = {
3005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3006 .rpc_argp = &args,
3007 .rpc_resp = &res,
3008 };
3009
3010 bitmask[0] = nfs4_fattr_bitmap[0];
3011 bitmask[1] = nfs4_fattr_bitmap[1];
3012 /*
3013 * Process the label in the upcoming getfattr
3014 */
3015 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3016
3017 nfs_fattr_init(info->fattr);
3018 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3019 }
3020
3021 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3022 struct nfs_fsinfo *info)
3023 {
3024 struct nfs4_exception exception = { };
3025 int err;
3026 do {
3027 err = _nfs4_lookup_root(server, fhandle, info);
3028 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3029 switch (err) {
3030 case 0:
3031 case -NFS4ERR_WRONGSEC:
3032 goto out;
3033 default:
3034 err = nfs4_handle_exception(server, err, &exception);
3035 }
3036 } while (exception.retry);
3037 out:
3038 return err;
3039 }
3040
3041 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3042 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3043 {
3044 struct rpc_auth_create_args auth_args = {
3045 .pseudoflavor = flavor,
3046 };
3047 struct rpc_auth *auth;
3048 int ret;
3049
3050 auth = rpcauth_create(&auth_args, server->client);
3051 if (IS_ERR(auth)) {
3052 ret = -EACCES;
3053 goto out;
3054 }
3055 ret = nfs4_lookup_root(server, fhandle, info);
3056 out:
3057 return ret;
3058 }
3059
3060 /*
3061 * Retry pseudoroot lookup with various security flavors. We do this when:
3062 *
3063 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3064 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3065 *
3066 * Returns zero on success, or a negative NFS4ERR value, or a
3067 * negative errno value.
3068 */
3069 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3070 struct nfs_fsinfo *info)
3071 {
3072 /* Per 3530bis 15.33.5 */
3073 static const rpc_authflavor_t flav_array[] = {
3074 RPC_AUTH_GSS_KRB5P,
3075 RPC_AUTH_GSS_KRB5I,
3076 RPC_AUTH_GSS_KRB5,
3077 RPC_AUTH_UNIX, /* courtesy */
3078 RPC_AUTH_NULL,
3079 };
3080 int status = -EPERM;
3081 size_t i;
3082
3083 if (server->auth_info.flavor_len > 0) {
3084 /* try each flavor specified by user */
3085 for (i = 0; i < server->auth_info.flavor_len; i++) {
3086 status = nfs4_lookup_root_sec(server, fhandle, info,
3087 server->auth_info.flavors[i]);
3088 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3089 continue;
3090 break;
3091 }
3092 } else {
3093 /* no flavors specified by user, try default list */
3094 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3095 status = nfs4_lookup_root_sec(server, fhandle, info,
3096 flav_array[i]);
3097 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3098 continue;
3099 break;
3100 }
3101 }
3102
3103 /*
3104 * -EACCESS could mean that the user doesn't have correct permissions
3105 * to access the mount. It could also mean that we tried to mount
3106 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
3107 * existing mount programs don't handle -EACCES very well so it should
3108 * be mapped to -EPERM instead.
3109 */
3110 if (status == -EACCES)
3111 status = -EPERM;
3112 return status;
3113 }
3114
3115 static int nfs4_do_find_root_sec(struct nfs_server *server,
3116 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3117 {
3118 int mv = server->nfs_client->cl_minorversion;
3119 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3120 }
3121
3122 /**
3123 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3124 * @server: initialized nfs_server handle
3125 * @fhandle: we fill in the pseudo-fs root file handle
3126 * @info: we fill in an FSINFO struct
3127 * @auth_probe: probe the auth flavours
3128 *
3129 * Returns zero on success, or a negative errno.
3130 */
3131 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3132 struct nfs_fsinfo *info,
3133 bool auth_probe)
3134 {
3135 int status = 0;
3136
3137 if (!auth_probe)
3138 status = nfs4_lookup_root(server, fhandle, info);
3139
3140 if (auth_probe || status == NFS4ERR_WRONGSEC)
3141 status = nfs4_do_find_root_sec(server, fhandle, info);
3142
3143 if (status == 0)
3144 status = nfs4_server_capabilities(server, fhandle);
3145 if (status == 0)
3146 status = nfs4_do_fsinfo(server, fhandle, info);
3147
3148 return nfs4_map_errors(status);
3149 }
3150
3151 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3152 struct nfs_fsinfo *info)
3153 {
3154 int error;
3155 struct nfs_fattr *fattr = info->fattr;
3156 struct nfs4_label *label = NULL;
3157
3158 error = nfs4_server_capabilities(server, mntfh);
3159 if (error < 0) {
3160 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3161 return error;
3162 }
3163
3164 label = nfs4_label_alloc(server, GFP_KERNEL);
3165 if (IS_ERR(label))
3166 return PTR_ERR(label);
3167
3168 error = nfs4_proc_getattr(server, mntfh, fattr, label);
3169 if (error < 0) {
3170 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3171 goto err_free_label;
3172 }
3173
3174 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3175 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3176 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3177
3178 err_free_label:
3179 nfs4_label_free(label);
3180
3181 return error;
3182 }
3183
3184 /*
3185 * Get locations and (maybe) other attributes of a referral.
3186 * Note that we'll actually follow the referral later when
3187 * we detect fsid mismatch in inode revalidation
3188 */
3189 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3190 const struct qstr *name, struct nfs_fattr *fattr,
3191 struct nfs_fh *fhandle)
3192 {
3193 int status = -ENOMEM;
3194 struct page *page = NULL;
3195 struct nfs4_fs_locations *locations = NULL;
3196
3197 page = alloc_page(GFP_KERNEL);
3198 if (page == NULL)
3199 goto out;
3200 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3201 if (locations == NULL)
3202 goto out;
3203
3204 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3205 if (status != 0)
3206 goto out;
3207
3208 /*
3209 * If the fsid didn't change, this is a migration event, not a
3210 * referral. Cause us to drop into the exception handler, which
3211 * will kick off migration recovery.
3212 */
3213 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3214 dprintk("%s: server did not return a different fsid for"
3215 " a referral at %s\n", __func__, name->name);
3216 status = -NFS4ERR_MOVED;
3217 goto out;
3218 }
3219 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3220 nfs_fixup_referral_attributes(&locations->fattr);
3221
3222 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3223 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3224 memset(fhandle, 0, sizeof(struct nfs_fh));
3225 out:
3226 if (page)
3227 __free_page(page);
3228 kfree(locations);
3229 return status;
3230 }
3231
3232 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3233 struct nfs_fattr *fattr, struct nfs4_label *label)
3234 {
3235 struct nfs4_getattr_arg args = {
3236 .fh = fhandle,
3237 .bitmask = server->attr_bitmask,
3238 };
3239 struct nfs4_getattr_res res = {
3240 .fattr = fattr,
3241 .label = label,
3242 .server = server,
3243 };
3244 struct rpc_message msg = {
3245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3246 .rpc_argp = &args,
3247 .rpc_resp = &res,
3248 };
3249
3250 args.bitmask = nfs4_bitmask(server, label);
3251
3252 nfs_fattr_init(fattr);
3253 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3254 }
3255
3256 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3257 struct nfs_fattr *fattr, struct nfs4_label *label)
3258 {
3259 struct nfs4_exception exception = { };
3260 int err;
3261 do {
3262 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3263 trace_nfs4_getattr(server, fhandle, fattr, err);
3264 err = nfs4_handle_exception(server, err,
3265 &exception);
3266 } while (exception.retry);
3267 return err;
3268 }
3269
3270 /*
3271 * The file is not closed if it is opened due to the a request to change
3272 * the size of the file. The open call will not be needed once the
3273 * VFS layer lookup-intents are implemented.
3274 *
3275 * Close is called when the inode is destroyed.
3276 * If we haven't opened the file for O_WRONLY, we
3277 * need to in the size_change case to obtain a stateid.
3278 *
3279 * Got race?
3280 * Because OPEN is always done by name in nfsv4, it is
3281 * possible that we opened a different file by the same
3282 * name. We can recognize this race condition, but we
3283 * can't do anything about it besides returning an error.
3284 *
3285 * This will be fixed with VFS changes (lookup-intent).
3286 */
3287 static int
3288 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3289 struct iattr *sattr)
3290 {
3291 struct inode *inode = d_inode(dentry);
3292 struct rpc_cred *cred = NULL;
3293 struct nfs4_state *state = NULL;
3294 struct nfs4_label *label = NULL;
3295 int status;
3296
3297 if (pnfs_ld_layoutret_on_setattr(inode) &&
3298 sattr->ia_valid & ATTR_SIZE &&
3299 sattr->ia_size < i_size_read(inode))
3300 pnfs_commit_and_return_layout(inode);
3301
3302 nfs_fattr_init(fattr);
3303
3304 /* Deal with open(O_TRUNC) */
3305 if (sattr->ia_valid & ATTR_OPEN)
3306 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3307
3308 /* Optimization: if the end result is no change, don't RPC */
3309 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3310 return 0;
3311
3312 /* Search for an existing open(O_WRITE) file */
3313 if (sattr->ia_valid & ATTR_FILE) {
3314 struct nfs_open_context *ctx;
3315
3316 ctx = nfs_file_open_context(sattr->ia_file);
3317 if (ctx) {
3318 cred = ctx->cred;
3319 state = ctx->state;
3320 }
3321 }
3322
3323 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3324 if (IS_ERR(label))
3325 return PTR_ERR(label);
3326
3327 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3328 if (status == 0) {
3329 nfs_setattr_update_inode(inode, sattr, fattr);
3330 nfs_setsecurity(inode, fattr, label);
3331 }
3332 nfs4_label_free(label);
3333 return status;
3334 }
3335
3336 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3337 const struct qstr *name, struct nfs_fh *fhandle,
3338 struct nfs_fattr *fattr, struct nfs4_label *label)
3339 {
3340 struct nfs_server *server = NFS_SERVER(dir);
3341 int status;
3342 struct nfs4_lookup_arg args = {
3343 .bitmask = server->attr_bitmask,
3344 .dir_fh = NFS_FH(dir),
3345 .name = name,
3346 };
3347 struct nfs4_lookup_res res = {
3348 .server = server,
3349 .fattr = fattr,
3350 .label = label,
3351 .fh = fhandle,
3352 };
3353 struct rpc_message msg = {
3354 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3355 .rpc_argp = &args,
3356 .rpc_resp = &res,
3357 };
3358
3359 args.bitmask = nfs4_bitmask(server, label);
3360
3361 nfs_fattr_init(fattr);
3362
3363 dprintk("NFS call lookup %s\n", name->name);
3364 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3365 dprintk("NFS reply lookup: %d\n", status);
3366 return status;
3367 }
3368
3369 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3370 {
3371 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3372 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3373 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3374 fattr->nlink = 2;
3375 }
3376
3377 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3378 struct qstr *name, struct nfs_fh *fhandle,
3379 struct nfs_fattr *fattr, struct nfs4_label *label)
3380 {
3381 struct nfs4_exception exception = { };
3382 struct rpc_clnt *client = *clnt;
3383 int err;
3384 do {
3385 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3386 trace_nfs4_lookup(dir, name, err);
3387 switch (err) {
3388 case -NFS4ERR_BADNAME:
3389 err = -ENOENT;
3390 goto out;
3391 case -NFS4ERR_MOVED:
3392 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3393 if (err == -NFS4ERR_MOVED)
3394 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3395 goto out;
3396 case -NFS4ERR_WRONGSEC:
3397 err = -EPERM;
3398 if (client != *clnt)
3399 goto out;
3400 client = nfs4_negotiate_security(client, dir, name);
3401 if (IS_ERR(client))
3402 return PTR_ERR(client);
3403
3404 exception.retry = 1;
3405 break;
3406 default:
3407 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3408 }
3409 } while (exception.retry);
3410
3411 out:
3412 if (err == 0)
3413 *clnt = client;
3414 else if (client != *clnt)
3415 rpc_shutdown_client(client);
3416
3417 return err;
3418 }
3419
3420 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3421 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3422 struct nfs4_label *label)
3423 {
3424 int status;
3425 struct rpc_clnt *client = NFS_CLIENT(dir);
3426
3427 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3428 if (client != NFS_CLIENT(dir)) {
3429 rpc_shutdown_client(client);
3430 nfs_fixup_secinfo_attributes(fattr);
3431 }
3432 return status;
3433 }
3434
3435 struct rpc_clnt *
3436 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3437 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3438 {
3439 struct rpc_clnt *client = NFS_CLIENT(dir);
3440 int status;
3441
3442 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3443 if (status < 0)
3444 return ERR_PTR(status);
3445 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3446 }
3447
3448 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3449 {
3450 struct nfs_server *server = NFS_SERVER(inode);
3451 struct nfs4_accessargs args = {
3452 .fh = NFS_FH(inode),
3453 .bitmask = server->cache_consistency_bitmask,
3454 };
3455 struct nfs4_accessres res = {
3456 .server = server,
3457 };
3458 struct rpc_message msg = {
3459 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3460 .rpc_argp = &args,
3461 .rpc_resp = &res,
3462 .rpc_cred = entry->cred,
3463 };
3464 int mode = entry->mask;
3465 int status = 0;
3466
3467 /*
3468 * Determine which access bits we want to ask for...
3469 */
3470 if (mode & MAY_READ)
3471 args.access |= NFS4_ACCESS_READ;
3472 if (S_ISDIR(inode->i_mode)) {
3473 if (mode & MAY_WRITE)
3474 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3475 if (mode & MAY_EXEC)
3476 args.access |= NFS4_ACCESS_LOOKUP;
3477 } else {
3478 if (mode & MAY_WRITE)
3479 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3480 if (mode & MAY_EXEC)
3481 args.access |= NFS4_ACCESS_EXECUTE;
3482 }
3483
3484 res.fattr = nfs_alloc_fattr();
3485 if (res.fattr == NULL)
3486 return -ENOMEM;
3487
3488 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3489 if (!status) {
3490 nfs_access_set_mask(entry, res.access);
3491 nfs_refresh_inode(inode, res.fattr);
3492 }
3493 nfs_free_fattr(res.fattr);
3494 return status;
3495 }
3496
3497 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3498 {
3499 struct nfs4_exception exception = { };
3500 int err;
3501 do {
3502 err = _nfs4_proc_access(inode, entry);
3503 trace_nfs4_access(inode, err);
3504 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3505 &exception);
3506 } while (exception.retry);
3507 return err;
3508 }
3509
3510 /*
3511 * TODO: For the time being, we don't try to get any attributes
3512 * along with any of the zero-copy operations READ, READDIR,
3513 * READLINK, WRITE.
3514 *
3515 * In the case of the first three, we want to put the GETATTR
3516 * after the read-type operation -- this is because it is hard
3517 * to predict the length of a GETATTR response in v4, and thus
3518 * align the READ data correctly. This means that the GETATTR
3519 * may end up partially falling into the page cache, and we should
3520 * shift it into the 'tail' of the xdr_buf before processing.
3521 * To do this efficiently, we need to know the total length
3522 * of data received, which doesn't seem to be available outside
3523 * of the RPC layer.
3524 *
3525 * In the case of WRITE, we also want to put the GETATTR after
3526 * the operation -- in this case because we want to make sure
3527 * we get the post-operation mtime and size.
3528 *
3529 * Both of these changes to the XDR layer would in fact be quite
3530 * minor, but I decided to leave them for a subsequent patch.
3531 */
3532 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3533 unsigned int pgbase, unsigned int pglen)
3534 {
3535 struct nfs4_readlink args = {
3536 .fh = NFS_FH(inode),
3537 .pgbase = pgbase,
3538 .pglen = pglen,
3539 .pages = &page,
3540 };
3541 struct nfs4_readlink_res res;
3542 struct rpc_message msg = {
3543 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3544 .rpc_argp = &args,
3545 .rpc_resp = &res,
3546 };
3547
3548 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3549 }
3550
3551 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3552 unsigned int pgbase, unsigned int pglen)
3553 {
3554 struct nfs4_exception exception = { };
3555 int err;
3556 do {
3557 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3558 trace_nfs4_readlink(inode, err);
3559 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3560 &exception);
3561 } while (exception.retry);
3562 return err;
3563 }
3564
3565 /*
3566 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3567 */
3568 static int
3569 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3570 int flags)
3571 {
3572 struct nfs4_label l, *ilabel = NULL;
3573 struct nfs_open_context *ctx;
3574 struct nfs4_state *state;
3575 int opened = 0;
3576 int status = 0;
3577
3578 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3579 if (IS_ERR(ctx))
3580 return PTR_ERR(ctx);
3581
3582 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3583
3584 sattr->ia_mode &= ~current_umask();
3585 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3586 if (IS_ERR(state)) {
3587 status = PTR_ERR(state);
3588 goto out;
3589 }
3590 out:
3591 nfs4_label_release_security(ilabel);
3592 put_nfs_open_context(ctx);
3593 return status;
3594 }
3595
3596 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3597 {
3598 struct nfs_server *server = NFS_SERVER(dir);
3599 struct nfs_removeargs args = {
3600 .fh = NFS_FH(dir),
3601 .name = *name,
3602 };
3603 struct nfs_removeres res = {
3604 .server = server,
3605 };
3606 struct rpc_message msg = {
3607 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3608 .rpc_argp = &args,
3609 .rpc_resp = &res,
3610 };
3611 int status;
3612
3613 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3614 if (status == 0)
3615 update_changeattr(dir, &res.cinfo);
3616 return status;
3617 }
3618
3619 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3620 {
3621 struct nfs4_exception exception = { };
3622 int err;
3623 do {
3624 err = _nfs4_proc_remove(dir, name);
3625 trace_nfs4_remove(dir, name, err);
3626 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3627 &exception);
3628 } while (exception.retry);
3629 return err;
3630 }
3631
3632 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3633 {
3634 struct nfs_server *server = NFS_SERVER(dir);
3635 struct nfs_removeargs *args = msg->rpc_argp;
3636 struct nfs_removeres *res = msg->rpc_resp;
3637
3638 res->server = server;
3639 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3640 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3641
3642 nfs_fattr_init(res->dir_attr);
3643 }
3644
3645 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3646 {
3647 nfs4_setup_sequence(NFS_SERVER(data->dir),
3648 &data->args.seq_args,
3649 &data->res.seq_res,
3650 task);
3651 }
3652
3653 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3654 {
3655 struct nfs_unlinkdata *data = task->tk_calldata;
3656 struct nfs_removeres *res = &data->res;
3657
3658 if (!nfs4_sequence_done(task, &res->seq_res))
3659 return 0;
3660 if (nfs4_async_handle_error(task, res->server, NULL,
3661 &data->timeout) == -EAGAIN)
3662 return 0;
3663 update_changeattr(dir, &res->cinfo);
3664 return 1;
3665 }
3666
3667 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3668 {
3669 struct nfs_server *server = NFS_SERVER(dir);
3670 struct nfs_renameargs *arg = msg->rpc_argp;
3671 struct nfs_renameres *res = msg->rpc_resp;
3672
3673 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3674 res->server = server;
3675 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3676 }
3677
3678 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3679 {
3680 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3681 &data->args.seq_args,
3682 &data->res.seq_res,
3683 task);
3684 }
3685
3686 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3687 struct inode *new_dir)
3688 {
3689 struct nfs_renamedata *data = task->tk_calldata;
3690 struct nfs_renameres *res = &data->res;
3691
3692 if (!nfs4_sequence_done(task, &res->seq_res))
3693 return 0;
3694 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3695 return 0;
3696
3697 update_changeattr(old_dir, &res->old_cinfo);
3698 update_changeattr(new_dir, &res->new_cinfo);
3699 return 1;
3700 }
3701
3702 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3703 {
3704 struct nfs_server *server = NFS_SERVER(inode);
3705 struct nfs4_link_arg arg = {
3706 .fh = NFS_FH(inode),
3707 .dir_fh = NFS_FH(dir),
3708 .name = name,
3709 .bitmask = server->attr_bitmask,
3710 };
3711 struct nfs4_link_res res = {
3712 .server = server,
3713 .label = NULL,
3714 };
3715 struct rpc_message msg = {
3716 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3717 .rpc_argp = &arg,
3718 .rpc_resp = &res,
3719 };
3720 int status = -ENOMEM;
3721
3722 res.fattr = nfs_alloc_fattr();
3723 if (res.fattr == NULL)
3724 goto out;
3725
3726 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3727 if (IS_ERR(res.label)) {
3728 status = PTR_ERR(res.label);
3729 goto out;
3730 }
3731 arg.bitmask = nfs4_bitmask(server, res.label);
3732
3733 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3734 if (!status) {
3735 update_changeattr(dir, &res.cinfo);
3736 status = nfs_post_op_update_inode(inode, res.fattr);
3737 if (!status)
3738 nfs_setsecurity(inode, res.fattr, res.label);
3739 }
3740
3741
3742 nfs4_label_free(res.label);
3743
3744 out:
3745 nfs_free_fattr(res.fattr);
3746 return status;
3747 }
3748
3749 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3750 {
3751 struct nfs4_exception exception = { };
3752 int err;
3753 do {
3754 err = nfs4_handle_exception(NFS_SERVER(inode),
3755 _nfs4_proc_link(inode, dir, name),
3756 &exception);
3757 } while (exception.retry);
3758 return err;
3759 }
3760
3761 struct nfs4_createdata {
3762 struct rpc_message msg;
3763 struct nfs4_create_arg arg;
3764 struct nfs4_create_res res;
3765 struct nfs_fh fh;
3766 struct nfs_fattr fattr;
3767 struct nfs4_label *label;
3768 };
3769
3770 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3771 struct qstr *name, struct iattr *sattr, u32 ftype)
3772 {
3773 struct nfs4_createdata *data;
3774
3775 data = kzalloc(sizeof(*data), GFP_KERNEL);
3776 if (data != NULL) {
3777 struct nfs_server *server = NFS_SERVER(dir);
3778
3779 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3780 if (IS_ERR(data->label))
3781 goto out_free;
3782
3783 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3784 data->msg.rpc_argp = &data->arg;
3785 data->msg.rpc_resp = &data->res;
3786 data->arg.dir_fh = NFS_FH(dir);
3787 data->arg.server = server;
3788 data->arg.name = name;
3789 data->arg.attrs = sattr;
3790 data->arg.ftype = ftype;
3791 data->arg.bitmask = nfs4_bitmask(server, data->label);
3792 data->res.server = server;
3793 data->res.fh = &data->fh;
3794 data->res.fattr = &data->fattr;
3795 data->res.label = data->label;
3796 nfs_fattr_init(data->res.fattr);
3797 }
3798 return data;
3799 out_free:
3800 kfree(data);
3801 return NULL;
3802 }
3803
3804 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3805 {
3806 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3807 &data->arg.seq_args, &data->res.seq_res, 1);
3808 if (status == 0) {
3809 update_changeattr(dir, &data->res.dir_cinfo);
3810 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3811 }
3812 return status;
3813 }
3814
3815 static void nfs4_free_createdata(struct nfs4_createdata *data)
3816 {
3817 nfs4_label_free(data->label);
3818 kfree(data);
3819 }
3820
3821 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3822 struct page *page, unsigned int len, struct iattr *sattr,
3823 struct nfs4_label *label)
3824 {
3825 struct nfs4_createdata *data;
3826 int status = -ENAMETOOLONG;
3827
3828 if (len > NFS4_MAXPATHLEN)
3829 goto out;
3830
3831 status = -ENOMEM;
3832 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3833 if (data == NULL)
3834 goto out;
3835
3836 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3837 data->arg.u.symlink.pages = &page;
3838 data->arg.u.symlink.len = len;
3839 data->arg.label = label;
3840
3841 status = nfs4_do_create(dir, dentry, data);
3842
3843 nfs4_free_createdata(data);
3844 out:
3845 return status;
3846 }
3847
3848 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3849 struct page *page, unsigned int len, struct iattr *sattr)
3850 {
3851 struct nfs4_exception exception = { };
3852 struct nfs4_label l, *label = NULL;
3853 int err;
3854
3855 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3856
3857 do {
3858 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3859 trace_nfs4_symlink(dir, &dentry->d_name, err);
3860 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3861 &exception);
3862 } while (exception.retry);
3863
3864 nfs4_label_release_security(label);
3865 return err;
3866 }
3867
3868 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3869 struct iattr *sattr, struct nfs4_label *label)
3870 {
3871 struct nfs4_createdata *data;
3872 int status = -ENOMEM;
3873
3874 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3875 if (data == NULL)
3876 goto out;
3877
3878 data->arg.label = label;
3879 status = nfs4_do_create(dir, dentry, data);
3880
3881 nfs4_free_createdata(data);
3882 out:
3883 return status;
3884 }
3885
3886 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3887 struct iattr *sattr)
3888 {
3889 struct nfs4_exception exception = { };
3890 struct nfs4_label l, *label = NULL;
3891 int err;
3892
3893 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3894
3895 sattr->ia_mode &= ~current_umask();
3896 do {
3897 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3898 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3899 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3900 &exception);
3901 } while (exception.retry);
3902 nfs4_label_release_security(label);
3903
3904 return err;
3905 }
3906
3907 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3908 u64 cookie, struct page **pages, unsigned int count, int plus)
3909 {
3910 struct inode *dir = d_inode(dentry);
3911 struct nfs4_readdir_arg args = {
3912 .fh = NFS_FH(dir),
3913 .pages = pages,
3914 .pgbase = 0,
3915 .count = count,
3916 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
3917 .plus = plus,
3918 };
3919 struct nfs4_readdir_res res;
3920 struct rpc_message msg = {
3921 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3922 .rpc_argp = &args,
3923 .rpc_resp = &res,
3924 .rpc_cred = cred,
3925 };
3926 int status;
3927
3928 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3929 dentry,
3930 (unsigned long long)cookie);
3931 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3932 res.pgbase = args.pgbase;
3933 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3934 if (status >= 0) {
3935 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3936 status += args.pgbase;
3937 }
3938
3939 nfs_invalidate_atime(dir);
3940
3941 dprintk("%s: returns %d\n", __func__, status);
3942 return status;
3943 }
3944
3945 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3946 u64 cookie, struct page **pages, unsigned int count, int plus)
3947 {
3948 struct nfs4_exception exception = { };
3949 int err;
3950 do {
3951 err = _nfs4_proc_readdir(dentry, cred, cookie,
3952 pages, count, plus);
3953 trace_nfs4_readdir(d_inode(dentry), err);
3954 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
3955 &exception);
3956 } while (exception.retry);
3957 return err;
3958 }
3959
3960 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3961 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3962 {
3963 struct nfs4_createdata *data;
3964 int mode = sattr->ia_mode;
3965 int status = -ENOMEM;
3966
3967 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3968 if (data == NULL)
3969 goto out;
3970
3971 if (S_ISFIFO(mode))
3972 data->arg.ftype = NF4FIFO;
3973 else if (S_ISBLK(mode)) {
3974 data->arg.ftype = NF4BLK;
3975 data->arg.u.device.specdata1 = MAJOR(rdev);
3976 data->arg.u.device.specdata2 = MINOR(rdev);
3977 }
3978 else if (S_ISCHR(mode)) {
3979 data->arg.ftype = NF4CHR;
3980 data->arg.u.device.specdata1 = MAJOR(rdev);
3981 data->arg.u.device.specdata2 = MINOR(rdev);
3982 } else if (!S_ISSOCK(mode)) {
3983 status = -EINVAL;
3984 goto out_free;
3985 }
3986
3987 data->arg.label = label;
3988 status = nfs4_do_create(dir, dentry, data);
3989 out_free:
3990 nfs4_free_createdata(data);
3991 out:
3992 return status;
3993 }
3994
3995 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3996 struct iattr *sattr, dev_t rdev)
3997 {
3998 struct nfs4_exception exception = { };
3999 struct nfs4_label l, *label = NULL;
4000 int err;
4001
4002 label = nfs4_label_init_security(dir, dentry, sattr, &l);
4003
4004 sattr->ia_mode &= ~current_umask();
4005 do {
4006 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4007 trace_nfs4_mknod(dir, &dentry->d_name, err);
4008 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4009 &exception);
4010 } while (exception.retry);
4011
4012 nfs4_label_release_security(label);
4013
4014 return err;
4015 }
4016
4017 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4018 struct nfs_fsstat *fsstat)
4019 {
4020 struct nfs4_statfs_arg args = {
4021 .fh = fhandle,
4022 .bitmask = server->attr_bitmask,
4023 };
4024 struct nfs4_statfs_res res = {
4025 .fsstat = fsstat,
4026 };
4027 struct rpc_message msg = {
4028 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4029 .rpc_argp = &args,
4030 .rpc_resp = &res,
4031 };
4032
4033 nfs_fattr_init(fsstat->fattr);
4034 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4035 }
4036
4037 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4038 {
4039 struct nfs4_exception exception = { };
4040 int err;
4041 do {
4042 err = nfs4_handle_exception(server,
4043 _nfs4_proc_statfs(server, fhandle, fsstat),
4044 &exception);
4045 } while (exception.retry);
4046 return err;
4047 }
4048
4049 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4050 struct nfs_fsinfo *fsinfo)
4051 {
4052 struct nfs4_fsinfo_arg args = {
4053 .fh = fhandle,
4054 .bitmask = server->attr_bitmask,
4055 };
4056 struct nfs4_fsinfo_res res = {
4057 .fsinfo = fsinfo,
4058 };
4059 struct rpc_message msg = {
4060 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4061 .rpc_argp = &args,
4062 .rpc_resp = &res,
4063 };
4064
4065 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4066 }
4067
4068 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4069 {
4070 struct nfs4_exception exception = { };
4071 unsigned long now = jiffies;
4072 int err;
4073
4074 do {
4075 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4076 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4077 if (err == 0) {
4078 struct nfs_client *clp = server->nfs_client;
4079
4080 spin_lock(&clp->cl_lock);
4081 clp->cl_lease_time = fsinfo->lease_time * HZ;
4082 clp->cl_last_renewal = now;
4083 spin_unlock(&clp->cl_lock);
4084 break;
4085 }
4086 err = nfs4_handle_exception(server, err, &exception);
4087 } while (exception.retry);
4088 return err;
4089 }
4090
4091 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4092 {
4093 int error;
4094
4095 nfs_fattr_init(fsinfo->fattr);
4096 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4097 if (error == 0) {
4098 /* block layout checks this! */
4099 server->pnfs_blksize = fsinfo->blksize;
4100 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4101 }
4102
4103 return error;
4104 }
4105
4106 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4107 struct nfs_pathconf *pathconf)
4108 {
4109 struct nfs4_pathconf_arg args = {
4110 .fh = fhandle,
4111 .bitmask = server->attr_bitmask,
4112 };
4113 struct nfs4_pathconf_res res = {
4114 .pathconf = pathconf,
4115 };
4116 struct rpc_message msg = {
4117 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4118 .rpc_argp = &args,
4119 .rpc_resp = &res,
4120 };
4121
4122 /* None of the pathconf attributes are mandatory to implement */
4123 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4124 memset(pathconf, 0, sizeof(*pathconf));
4125 return 0;
4126 }
4127
4128 nfs_fattr_init(pathconf->fattr);
4129 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4130 }
4131
4132 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4133 struct nfs_pathconf *pathconf)
4134 {
4135 struct nfs4_exception exception = { };
4136 int err;
4137
4138 do {
4139 err = nfs4_handle_exception(server,
4140 _nfs4_proc_pathconf(server, fhandle, pathconf),
4141 &exception);
4142 } while (exception.retry);
4143 return err;
4144 }
4145
4146 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4147 const struct nfs_open_context *ctx,
4148 const struct nfs_lock_context *l_ctx,
4149 fmode_t fmode)
4150 {
4151 const struct nfs_lockowner *lockowner = NULL;
4152
4153 if (l_ctx != NULL)
4154 lockowner = &l_ctx->lockowner;
4155 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4156 }
4157 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4158
4159 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4160 const struct nfs_open_context *ctx,
4161 const struct nfs_lock_context *l_ctx,
4162 fmode_t fmode)
4163 {
4164 nfs4_stateid current_stateid;
4165
4166 /* If the current stateid represents a lost lock, then exit */
4167 if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode) == -EIO)
4168 return true;
4169 return nfs4_stateid_match(stateid, ¤t_stateid);
4170 }
4171
4172 static bool nfs4_error_stateid_expired(int err)
4173 {
4174 switch (err) {
4175 case -NFS4ERR_DELEG_REVOKED:
4176 case -NFS4ERR_ADMIN_REVOKED:
4177 case -NFS4ERR_BAD_STATEID:
4178 case -NFS4ERR_STALE_STATEID:
4179 case -NFS4ERR_OLD_STATEID:
4180 case -NFS4ERR_OPENMODE:
4181 case -NFS4ERR_EXPIRED:
4182 return true;
4183 }
4184 return false;
4185 }
4186
4187 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4188 {
4189 nfs_invalidate_atime(hdr->inode);
4190 }
4191
4192 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4193 {
4194 struct nfs_server *server = NFS_SERVER(hdr->inode);
4195
4196 trace_nfs4_read(hdr, task->tk_status);
4197 if (nfs4_async_handle_error(task, server,
4198 hdr->args.context->state,
4199 NULL) == -EAGAIN) {
4200 rpc_restart_call_prepare(task);
4201 return -EAGAIN;
4202 }
4203
4204 __nfs4_read_done_cb(hdr);
4205 if (task->tk_status > 0)
4206 renew_lease(server, hdr->timestamp);
4207 return 0;
4208 }
4209
4210 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4211 struct nfs_pgio_args *args)
4212 {
4213
4214 if (!nfs4_error_stateid_expired(task->tk_status) ||
4215 nfs4_stateid_is_current(&args->stateid,
4216 args->context,
4217 args->lock_context,
4218 FMODE_READ))
4219 return false;
4220 rpc_restart_call_prepare(task);
4221 return true;
4222 }
4223
4224 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4225 {
4226
4227 dprintk("--> %s\n", __func__);
4228
4229 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4230 return -EAGAIN;
4231 if (nfs4_read_stateid_changed(task, &hdr->args))
4232 return -EAGAIN;
4233 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4234 nfs4_read_done_cb(task, hdr);
4235 }
4236
4237 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4238 struct rpc_message *msg)
4239 {
4240 hdr->timestamp = jiffies;
4241 hdr->pgio_done_cb = nfs4_read_done_cb;
4242 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4243 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4244 }
4245
4246 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4247 struct nfs_pgio_header *hdr)
4248 {
4249 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4250 &hdr->args.seq_args,
4251 &hdr->res.seq_res,
4252 task))
4253 return 0;
4254 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4255 hdr->args.lock_context,
4256 hdr->rw_ops->rw_mode) == -EIO)
4257 return -EIO;
4258 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4259 return -EIO;
4260 return 0;
4261 }
4262
4263 static int nfs4_write_done_cb(struct rpc_task *task,
4264 struct nfs_pgio_header *hdr)
4265 {
4266 struct inode *inode = hdr->inode;
4267
4268 trace_nfs4_write(hdr, task->tk_status);
4269 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4270 hdr->args.context->state,
4271 NULL) == -EAGAIN) {
4272 rpc_restart_call_prepare(task);
4273 return -EAGAIN;
4274 }
4275 if (task->tk_status >= 0) {
4276 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4277 nfs_writeback_update_inode(hdr);
4278 }
4279 return 0;
4280 }
4281
4282 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4283 struct nfs_pgio_args *args)
4284 {
4285
4286 if (!nfs4_error_stateid_expired(task->tk_status) ||
4287 nfs4_stateid_is_current(&args->stateid,
4288 args->context,
4289 args->lock_context,
4290 FMODE_WRITE))
4291 return false;
4292 rpc_restart_call_prepare(task);
4293 return true;
4294 }
4295
4296 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4297 {
4298 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4299 return -EAGAIN;
4300 if (nfs4_write_stateid_changed(task, &hdr->args))
4301 return -EAGAIN;
4302 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4303 nfs4_write_done_cb(task, hdr);
4304 }
4305
4306 static
4307 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4308 {
4309 /* Don't request attributes for pNFS or O_DIRECT writes */
4310 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4311 return false;
4312 /* Otherwise, request attributes if and only if we don't hold
4313 * a delegation
4314 */
4315 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4316 }
4317
4318 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4319 struct rpc_message *msg)
4320 {
4321 struct nfs_server *server = NFS_SERVER(hdr->inode);
4322
4323 if (!nfs4_write_need_cache_consistency_data(hdr)) {
4324 hdr->args.bitmask = NULL;
4325 hdr->res.fattr = NULL;
4326 } else
4327 hdr->args.bitmask = server->cache_consistency_bitmask;
4328
4329 if (!hdr->pgio_done_cb)
4330 hdr->pgio_done_cb = nfs4_write_done_cb;
4331 hdr->res.server = server;
4332 hdr->timestamp = jiffies;
4333
4334 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4335 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4336 }
4337
4338 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4339 {
4340 nfs4_setup_sequence(NFS_SERVER(data->inode),
4341 &data->args.seq_args,
4342 &data->res.seq_res,
4343 task);
4344 }
4345
4346 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4347 {
4348 struct inode *inode = data->inode;
4349
4350 trace_nfs4_commit(data, task->tk_status);
4351 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4352 NULL, NULL) == -EAGAIN) {
4353 rpc_restart_call_prepare(task);
4354 return -EAGAIN;
4355 }
4356 return 0;
4357 }
4358
4359 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4360 {
4361 if (!nfs4_sequence_done(task, &data->res.seq_res))
4362 return -EAGAIN;
4363 return data->commit_done_cb(task, data);
4364 }
4365
4366 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4367 {
4368 struct nfs_server *server = NFS_SERVER(data->inode);
4369
4370 if (data->commit_done_cb == NULL)
4371 data->commit_done_cb = nfs4_commit_done_cb;
4372 data->res.server = server;
4373 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4374 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4375 }
4376
4377 struct nfs4_renewdata {
4378 struct nfs_client *client;
4379 unsigned long timestamp;
4380 };
4381
4382 /*
4383 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4384 * standalone procedure for queueing an asynchronous RENEW.
4385 */
4386 static void nfs4_renew_release(void *calldata)
4387 {
4388 struct nfs4_renewdata *data = calldata;
4389 struct nfs_client *clp = data->client;
4390
4391 if (atomic_read(&clp->cl_count) > 1)
4392 nfs4_schedule_state_renewal(clp);
4393 nfs_put_client(clp);
4394 kfree(data);
4395 }
4396
4397 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4398 {
4399 struct nfs4_renewdata *data = calldata;
4400 struct nfs_client *clp = data->client;
4401 unsigned long timestamp = data->timestamp;
4402
4403 trace_nfs4_renew_async(clp, task->tk_status);
4404 switch (task->tk_status) {
4405 case 0:
4406 break;
4407 case -NFS4ERR_LEASE_MOVED:
4408 nfs4_schedule_lease_moved_recovery(clp);
4409 break;
4410 default:
4411 /* Unless we're shutting down, schedule state recovery! */
4412 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4413 return;
4414 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4415 nfs4_schedule_lease_recovery(clp);
4416 return;
4417 }
4418 nfs4_schedule_path_down_recovery(clp);
4419 }
4420 do_renew_lease(clp, timestamp);
4421 }
4422
4423 static const struct rpc_call_ops nfs4_renew_ops = {
4424 .rpc_call_done = nfs4_renew_done,
4425 .rpc_release = nfs4_renew_release,
4426 };
4427
4428 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4429 {
4430 struct rpc_message msg = {
4431 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4432 .rpc_argp = clp,
4433 .rpc_cred = cred,
4434 };
4435 struct nfs4_renewdata *data;
4436
4437 if (renew_flags == 0)
4438 return 0;
4439 if (!atomic_inc_not_zero(&clp->cl_count))
4440 return -EIO;
4441 data = kmalloc(sizeof(*data), GFP_NOFS);
4442 if (data == NULL)
4443 return -ENOMEM;
4444 data->client = clp;
4445 data->timestamp = jiffies;
4446 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4447 &nfs4_renew_ops, data);
4448 }
4449
4450 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4451 {
4452 struct rpc_message msg = {
4453 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4454 .rpc_argp = clp,
4455 .rpc_cred = cred,
4456 };
4457 unsigned long now = jiffies;
4458 int status;
4459
4460 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4461 if (status < 0)
4462 return status;
4463 do_renew_lease(clp, now);
4464 return 0;
4465 }
4466
4467 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4468 {
4469 return server->caps & NFS_CAP_ACLS;
4470 }
4471
4472 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4473 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4474 * the stack.
4475 */
4476 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4477
4478 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4479 struct page **pages, unsigned int *pgbase)
4480 {
4481 struct page *newpage, **spages;
4482 int rc = 0;
4483 size_t len;
4484 spages = pages;
4485
4486 do {
4487 len = min_t(size_t, PAGE_SIZE, buflen);
4488 newpage = alloc_page(GFP_KERNEL);
4489
4490 if (newpage == NULL)
4491 goto unwind;
4492 memcpy(page_address(newpage), buf, len);
4493 buf += len;
4494 buflen -= len;
4495 *pages++ = newpage;
4496 rc++;
4497 } while (buflen != 0);
4498
4499 return rc;
4500
4501 unwind:
4502 for(; rc > 0; rc--)
4503 __free_page(spages[rc-1]);
4504 return -ENOMEM;
4505 }
4506
4507 struct nfs4_cached_acl {
4508 int cached;
4509 size_t len;
4510 char data[0];
4511 };
4512
4513 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4514 {
4515 struct nfs_inode *nfsi = NFS_I(inode);
4516
4517 spin_lock(&inode->i_lock);
4518 kfree(nfsi->nfs4_acl);
4519 nfsi->nfs4_acl = acl;
4520 spin_unlock(&inode->i_lock);
4521 }
4522
4523 static void nfs4_zap_acl_attr(struct inode *inode)
4524 {
4525 nfs4_set_cached_acl(inode, NULL);
4526 }
4527
4528 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4529 {
4530 struct nfs_inode *nfsi = NFS_I(inode);
4531 struct nfs4_cached_acl *acl;
4532 int ret = -ENOENT;
4533
4534 spin_lock(&inode->i_lock);
4535 acl = nfsi->nfs4_acl;
4536 if (acl == NULL)
4537 goto out;
4538 if (buf == NULL) /* user is just asking for length */
4539 goto out_len;
4540 if (acl->cached == 0)
4541 goto out;
4542 ret = -ERANGE; /* see getxattr(2) man page */
4543 if (acl->len > buflen)
4544 goto out;
4545 memcpy(buf, acl->data, acl->len);
4546 out_len:
4547 ret = acl->len;
4548 out:
4549 spin_unlock(&inode->i_lock);
4550 return ret;
4551 }
4552
4553 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4554 {
4555 struct nfs4_cached_acl *acl;
4556 size_t buflen = sizeof(*acl) + acl_len;
4557
4558 if (buflen <= PAGE_SIZE) {
4559 acl = kmalloc(buflen, GFP_KERNEL);
4560 if (acl == NULL)
4561 goto out;
4562 acl->cached = 1;
4563 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4564 } else {
4565 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4566 if (acl == NULL)
4567 goto out;
4568 acl->cached = 0;
4569 }
4570 acl->len = acl_len;
4571 out:
4572 nfs4_set_cached_acl(inode, acl);
4573 }
4574
4575 /*
4576 * The getxattr API returns the required buffer length when called with a
4577 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4578 * the required buf. On a NULL buf, we send a page of data to the server
4579 * guessing that the ACL request can be serviced by a page. If so, we cache
4580 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4581 * the cache. If not so, we throw away the page, and cache the required
4582 * length. The next getxattr call will then produce another round trip to
4583 * the server, this time with the input buf of the required size.
4584 */
4585 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4586 {
4587 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4588 struct nfs_getaclargs args = {
4589 .fh = NFS_FH(inode),
4590 .acl_pages = pages,
4591 .acl_len = buflen,
4592 };
4593 struct nfs_getaclres res = {
4594 .acl_len = buflen,
4595 };
4596 struct rpc_message msg = {
4597 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4598 .rpc_argp = &args,
4599 .rpc_resp = &res,
4600 };
4601 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4602 int ret = -ENOMEM, i;
4603
4604 /* As long as we're doing a round trip to the server anyway,
4605 * let's be prepared for a page of acl data. */
4606 if (npages == 0)
4607 npages = 1;
4608 if (npages > ARRAY_SIZE(pages))
4609 return -ERANGE;
4610
4611 for (i = 0; i < npages; i++) {
4612 pages[i] = alloc_page(GFP_KERNEL);
4613 if (!pages[i])
4614 goto out_free;
4615 }
4616
4617 /* for decoding across pages */
4618 res.acl_scratch = alloc_page(GFP_KERNEL);
4619 if (!res.acl_scratch)
4620 goto out_free;
4621
4622 args.acl_len = npages * PAGE_SIZE;
4623 args.acl_pgbase = 0;
4624
4625 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4626 __func__, buf, buflen, npages, args.acl_len);
4627 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4628 &msg, &args.seq_args, &res.seq_res, 0);
4629 if (ret)
4630 goto out_free;
4631
4632 /* Handle the case where the passed-in buffer is too short */
4633 if (res.acl_flags & NFS4_ACL_TRUNC) {
4634 /* Did the user only issue a request for the acl length? */
4635 if (buf == NULL)
4636 goto out_ok;
4637 ret = -ERANGE;
4638 goto out_free;
4639 }
4640 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4641 if (buf) {
4642 if (res.acl_len > buflen) {
4643 ret = -ERANGE;
4644 goto out_free;
4645 }
4646 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4647 }
4648 out_ok:
4649 ret = res.acl_len;
4650 out_free:
4651 for (i = 0; i < npages; i++)
4652 if (pages[i])
4653 __free_page(pages[i]);
4654 if (res.acl_scratch)
4655 __free_page(res.acl_scratch);
4656 return ret;
4657 }
4658
4659 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4660 {
4661 struct nfs4_exception exception = { };
4662 ssize_t ret;
4663 do {
4664 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4665 trace_nfs4_get_acl(inode, ret);
4666 if (ret >= 0)
4667 break;
4668 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4669 } while (exception.retry);
4670 return ret;
4671 }
4672
4673 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4674 {
4675 struct nfs_server *server = NFS_SERVER(inode);
4676 int ret;
4677
4678 if (!nfs4_server_supports_acls(server))
4679 return -EOPNOTSUPP;
4680 ret = nfs_revalidate_inode(server, inode);
4681 if (ret < 0)
4682 return ret;
4683 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4684 nfs_zap_acl_cache(inode);
4685 ret = nfs4_read_cached_acl(inode, buf, buflen);
4686 if (ret != -ENOENT)
4687 /* -ENOENT is returned if there is no ACL or if there is an ACL
4688 * but no cached acl data, just the acl length */
4689 return ret;
4690 return nfs4_get_acl_uncached(inode, buf, buflen);
4691 }
4692
4693 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4694 {
4695 struct nfs_server *server = NFS_SERVER(inode);
4696 struct page *pages[NFS4ACL_MAXPAGES];
4697 struct nfs_setaclargs arg = {
4698 .fh = NFS_FH(inode),
4699 .acl_pages = pages,
4700 .acl_len = buflen,
4701 };
4702 struct nfs_setaclres res;
4703 struct rpc_message msg = {
4704 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4705 .rpc_argp = &arg,
4706 .rpc_resp = &res,
4707 };
4708 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4709 int ret, i;
4710
4711 if (!nfs4_server_supports_acls(server))
4712 return -EOPNOTSUPP;
4713 if (npages > ARRAY_SIZE(pages))
4714 return -ERANGE;
4715 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4716 if (i < 0)
4717 return i;
4718 nfs4_inode_return_delegation(inode);
4719 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4720
4721 /*
4722 * Free each page after tx, so the only ref left is
4723 * held by the network stack
4724 */
4725 for (; i > 0; i--)
4726 put_page(pages[i-1]);
4727
4728 /*
4729 * Acl update can result in inode attribute update.
4730 * so mark the attribute cache invalid.
4731 */
4732 spin_lock(&inode->i_lock);
4733 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4734 spin_unlock(&inode->i_lock);
4735 nfs_access_zap_cache(inode);
4736 nfs_zap_acl_cache(inode);
4737 return ret;
4738 }
4739
4740 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4741 {
4742 struct nfs4_exception exception = { };
4743 int err;
4744 do {
4745 err = __nfs4_proc_set_acl(inode, buf, buflen);
4746 trace_nfs4_set_acl(inode, err);
4747 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4748 &exception);
4749 } while (exception.retry);
4750 return err;
4751 }
4752
4753 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4754 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4755 size_t buflen)
4756 {
4757 struct nfs_server *server = NFS_SERVER(inode);
4758 struct nfs_fattr fattr;
4759 struct nfs4_label label = {0, 0, buflen, buf};
4760
4761 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4762 struct nfs4_getattr_arg arg = {
4763 .fh = NFS_FH(inode),
4764 .bitmask = bitmask,
4765 };
4766 struct nfs4_getattr_res res = {
4767 .fattr = &fattr,
4768 .label = &label,
4769 .server = server,
4770 };
4771 struct rpc_message msg = {
4772 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4773 .rpc_argp = &arg,
4774 .rpc_resp = &res,
4775 };
4776 int ret;
4777
4778 nfs_fattr_init(&fattr);
4779
4780 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4781 if (ret)
4782 return ret;
4783 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4784 return -ENOENT;
4785 if (buflen < label.len)
4786 return -ERANGE;
4787 return 0;
4788 }
4789
4790 static int nfs4_get_security_label(struct inode *inode, void *buf,
4791 size_t buflen)
4792 {
4793 struct nfs4_exception exception = { };
4794 int err;
4795
4796 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4797 return -EOPNOTSUPP;
4798
4799 do {
4800 err = _nfs4_get_security_label(inode, buf, buflen);
4801 trace_nfs4_get_security_label(inode, err);
4802 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4803 &exception);
4804 } while (exception.retry);
4805 return err;
4806 }
4807
4808 static int _nfs4_do_set_security_label(struct inode *inode,
4809 struct nfs4_label *ilabel,
4810 struct nfs_fattr *fattr,
4811 struct nfs4_label *olabel)
4812 {
4813
4814 struct iattr sattr = {0};
4815 struct nfs_server *server = NFS_SERVER(inode);
4816 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4817 struct nfs_setattrargs arg = {
4818 .fh = NFS_FH(inode),
4819 .iap = &sattr,
4820 .server = server,
4821 .bitmask = bitmask,
4822 .label = ilabel,
4823 };
4824 struct nfs_setattrres res = {
4825 .fattr = fattr,
4826 .label = olabel,
4827 .server = server,
4828 };
4829 struct rpc_message msg = {
4830 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4831 .rpc_argp = &arg,
4832 .rpc_resp = &res,
4833 };
4834 int status;
4835
4836 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4837
4838 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4839 if (status)
4840 dprintk("%s failed: %d\n", __func__, status);
4841
4842 return status;
4843 }
4844
4845 static int nfs4_do_set_security_label(struct inode *inode,
4846 struct nfs4_label *ilabel,
4847 struct nfs_fattr *fattr,
4848 struct nfs4_label *olabel)
4849 {
4850 struct nfs4_exception exception = { };
4851 int err;
4852
4853 do {
4854 err = _nfs4_do_set_security_label(inode, ilabel,
4855 fattr, olabel);
4856 trace_nfs4_set_security_label(inode, err);
4857 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4858 &exception);
4859 } while (exception.retry);
4860 return err;
4861 }
4862
4863 static int
4864 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4865 {
4866 struct nfs4_label ilabel, *olabel = NULL;
4867 struct nfs_fattr fattr;
4868 struct rpc_cred *cred;
4869 struct inode *inode = d_inode(dentry);
4870 int status;
4871
4872 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4873 return -EOPNOTSUPP;
4874
4875 nfs_fattr_init(&fattr);
4876
4877 ilabel.pi = 0;
4878 ilabel.lfs = 0;
4879 ilabel.label = (char *)buf;
4880 ilabel.len = buflen;
4881
4882 cred = rpc_lookup_cred();
4883 if (IS_ERR(cred))
4884 return PTR_ERR(cred);
4885
4886 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4887 if (IS_ERR(olabel)) {
4888 status = -PTR_ERR(olabel);
4889 goto out;
4890 }
4891
4892 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4893 if (status == 0)
4894 nfs_setsecurity(inode, &fattr, olabel);
4895
4896 nfs4_label_free(olabel);
4897 out:
4898 put_rpccred(cred);
4899 return status;
4900 }
4901 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4902
4903
4904 static int
4905 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4906 struct nfs4_state *state, long *timeout)
4907 {
4908 struct nfs_client *clp = server->nfs_client;
4909
4910 if (task->tk_status >= 0)
4911 return 0;
4912 switch(task->tk_status) {
4913 case -NFS4ERR_DELEG_REVOKED:
4914 case -NFS4ERR_ADMIN_REVOKED:
4915 case -NFS4ERR_BAD_STATEID:
4916 case -NFS4ERR_OPENMODE:
4917 if (state == NULL)
4918 break;
4919 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4920 goto recovery_failed;
4921 goto wait_on_recovery;
4922 case -NFS4ERR_EXPIRED:
4923 if (state != NULL) {
4924 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4925 goto recovery_failed;
4926 }
4927 case -NFS4ERR_STALE_STATEID:
4928 case -NFS4ERR_STALE_CLIENTID:
4929 nfs4_schedule_lease_recovery(clp);
4930 goto wait_on_recovery;
4931 case -NFS4ERR_MOVED:
4932 if (nfs4_schedule_migration_recovery(server) < 0)
4933 goto recovery_failed;
4934 goto wait_on_recovery;
4935 case -NFS4ERR_LEASE_MOVED:
4936 nfs4_schedule_lease_moved_recovery(clp);
4937 goto wait_on_recovery;
4938 #if defined(CONFIG_NFS_V4_1)
4939 case -NFS4ERR_BADSESSION:
4940 case -NFS4ERR_BADSLOT:
4941 case -NFS4ERR_BAD_HIGH_SLOT:
4942 case -NFS4ERR_DEADSESSION:
4943 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4944 case -NFS4ERR_SEQ_FALSE_RETRY:
4945 case -NFS4ERR_SEQ_MISORDERED:
4946 dprintk("%s ERROR %d, Reset session\n", __func__,
4947 task->tk_status);
4948 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4949 goto wait_on_recovery;
4950 #endif /* CONFIG_NFS_V4_1 */
4951 case -NFS4ERR_DELAY:
4952 nfs_inc_server_stats(server, NFSIOS_DELAY);
4953 rpc_delay(task, nfs4_update_delay(timeout));
4954 goto restart_call;
4955 case -NFS4ERR_GRACE:
4956 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4957 case -NFS4ERR_RETRY_UNCACHED_REP:
4958 case -NFS4ERR_OLD_STATEID:
4959 goto restart_call;
4960 }
4961 task->tk_status = nfs4_map_errors(task->tk_status);
4962 return 0;
4963 recovery_failed:
4964 task->tk_status = -EIO;
4965 return 0;
4966 wait_on_recovery:
4967 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4968 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4969 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4970 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4971 goto recovery_failed;
4972 restart_call:
4973 task->tk_status = 0;
4974 return -EAGAIN;
4975 }
4976
4977 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4978 nfs4_verifier *bootverf)
4979 {
4980 __be32 verf[2];
4981
4982 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4983 /* An impossible timestamp guarantees this value
4984 * will never match a generated boot time. */
4985 verf[0] = 0;
4986 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4987 } else {
4988 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4989 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4990 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4991 }
4992 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4993 }
4994
4995 static int
4996 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
4997 {
4998 int result;
4999 size_t len;
5000 char *str;
5001 bool retried = false;
5002
5003 if (clp->cl_owner_id != NULL)
5004 return 0;
5005 retry:
5006 rcu_read_lock();
5007 len = 14 + strlen(clp->cl_ipaddr) + 1 +
5008 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5009 1 +
5010 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5011 1;
5012 rcu_read_unlock();
5013
5014 if (len > NFS4_OPAQUE_LIMIT + 1)
5015 return -EINVAL;
5016
5017 /*
5018 * Since this string is allocated at mount time, and held until the
5019 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5020 * about a memory-reclaim deadlock.
5021 */
5022 str = kmalloc(len, GFP_KERNEL);
5023 if (!str)
5024 return -ENOMEM;
5025
5026 rcu_read_lock();
5027 result = scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5028 clp->cl_ipaddr,
5029 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5030 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5031 rcu_read_unlock();
5032
5033 /* Did something change? */
5034 if (result >= len) {
5035 kfree(str);
5036 if (retried)
5037 return -EINVAL;
5038 retried = true;
5039 goto retry;
5040 }
5041 clp->cl_owner_id = str;
5042 return 0;
5043 }
5044
5045 static int
5046 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5047 {
5048 int result;
5049 size_t len;
5050 char *str;
5051
5052 len = 10 + 10 + 1 + 10 + 1 +
5053 strlen(nfs4_client_id_uniquifier) + 1 +
5054 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5055
5056 if (len > NFS4_OPAQUE_LIMIT + 1)
5057 return -EINVAL;
5058
5059 /*
5060 * Since this string is allocated at mount time, and held until the
5061 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5062 * about a memory-reclaim deadlock.
5063 */
5064 str = kmalloc(len, GFP_KERNEL);
5065 if (!str)
5066 return -ENOMEM;
5067
5068 result = scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5069 clp->rpc_ops->version, clp->cl_minorversion,
5070 nfs4_client_id_uniquifier,
5071 clp->cl_rpcclient->cl_nodename);
5072 if (result >= len) {
5073 kfree(str);
5074 return -EINVAL;
5075 }
5076 clp->cl_owner_id = str;
5077 return 0;
5078 }
5079
5080 static int
5081 nfs4_init_uniform_client_string(struct nfs_client *clp)
5082 {
5083 int result;
5084 size_t len;
5085 char *str;
5086
5087 if (clp->cl_owner_id != NULL)
5088 return 0;
5089
5090 if (nfs4_client_id_uniquifier[0] != '\0')
5091 return nfs4_init_uniquifier_client_string(clp);
5092
5093 len = 10 + 10 + 1 + 10 + 1 +
5094 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5095
5096 if (len > NFS4_OPAQUE_LIMIT + 1)
5097 return -EINVAL;
5098
5099 /*
5100 * Since this string is allocated at mount time, and held until the
5101 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5102 * about a memory-reclaim deadlock.
5103 */
5104 str = kmalloc(len, GFP_KERNEL);
5105 if (!str)
5106 return -ENOMEM;
5107
5108 result = scnprintf(str, len, "Linux NFSv%u.%u %s",
5109 clp->rpc_ops->version, clp->cl_minorversion,
5110 clp->cl_rpcclient->cl_nodename);
5111 if (result >= len) {
5112 kfree(str);
5113 return -EINVAL;
5114 }
5115 clp->cl_owner_id = str;
5116 return 0;
5117 }
5118
5119 /*
5120 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5121 * services. Advertise one based on the address family of the
5122 * clientaddr.
5123 */
5124 static unsigned int
5125 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5126 {
5127 if (strchr(clp->cl_ipaddr, ':') != NULL)
5128 return scnprintf(buf, len, "tcp6");
5129 else
5130 return scnprintf(buf, len, "tcp");
5131 }
5132
5133 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5134 {
5135 struct nfs4_setclientid *sc = calldata;
5136
5137 if (task->tk_status == 0)
5138 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5139 }
5140
5141 static const struct rpc_call_ops nfs4_setclientid_ops = {
5142 .rpc_call_done = nfs4_setclientid_done,
5143 };
5144
5145 /**
5146 * nfs4_proc_setclientid - Negotiate client ID
5147 * @clp: state data structure
5148 * @program: RPC program for NFSv4 callback service
5149 * @port: IP port number for NFS4 callback service
5150 * @cred: RPC credential to use for this call
5151 * @res: where to place the result
5152 *
5153 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5154 */
5155 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5156 unsigned short port, struct rpc_cred *cred,
5157 struct nfs4_setclientid_res *res)
5158 {
5159 nfs4_verifier sc_verifier;
5160 struct nfs4_setclientid setclientid = {
5161 .sc_verifier = &sc_verifier,
5162 .sc_prog = program,
5163 .sc_clnt = clp,
5164 };
5165 struct rpc_message msg = {
5166 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5167 .rpc_argp = &setclientid,
5168 .rpc_resp = res,
5169 .rpc_cred = cred,
5170 };
5171 struct rpc_task *task;
5172 struct rpc_task_setup task_setup_data = {
5173 .rpc_client = clp->cl_rpcclient,
5174 .rpc_message = &msg,
5175 .callback_ops = &nfs4_setclientid_ops,
5176 .callback_data = &setclientid,
5177 .flags = RPC_TASK_TIMEOUT,
5178 };
5179 int status;
5180
5181 /* nfs_client_id4 */
5182 nfs4_init_boot_verifier(clp, &sc_verifier);
5183
5184 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5185 status = nfs4_init_uniform_client_string(clp);
5186 else
5187 status = nfs4_init_nonuniform_client_string(clp);
5188
5189 if (status)
5190 goto out;
5191
5192 /* cb_client4 */
5193 setclientid.sc_netid_len =
5194 nfs4_init_callback_netid(clp,
5195 setclientid.sc_netid,
5196 sizeof(setclientid.sc_netid));
5197 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5198 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5199 clp->cl_ipaddr, port >> 8, port & 255);
5200
5201 dprintk("NFS call setclientid auth=%s, '%s'\n",
5202 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5203 clp->cl_owner_id);
5204 task = rpc_run_task(&task_setup_data);
5205 if (IS_ERR(task)) {
5206 status = PTR_ERR(task);
5207 goto out;
5208 }
5209 status = task->tk_status;
5210 if (setclientid.sc_cred) {
5211 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5212 put_rpccred(setclientid.sc_cred);
5213 }
5214 rpc_put_task(task);
5215 out:
5216 trace_nfs4_setclientid(clp, status);
5217 dprintk("NFS reply setclientid: %d\n", status);
5218 return status;
5219 }
5220
5221 /**
5222 * nfs4_proc_setclientid_confirm - Confirm client ID
5223 * @clp: state data structure
5224 * @res: result of a previous SETCLIENTID
5225 * @cred: RPC credential to use for this call
5226 *
5227 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5228 */
5229 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5230 struct nfs4_setclientid_res *arg,
5231 struct rpc_cred *cred)
5232 {
5233 struct rpc_message msg = {
5234 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5235 .rpc_argp = arg,
5236 .rpc_cred = cred,
5237 };
5238 int status;
5239
5240 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
5241 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5242 clp->cl_clientid);
5243 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5244 trace_nfs4_setclientid_confirm(clp, status);
5245 dprintk("NFS reply setclientid_confirm: %d\n", status);
5246 return status;
5247 }
5248
5249 struct nfs4_delegreturndata {
5250 struct nfs4_delegreturnargs args;
5251 struct nfs4_delegreturnres res;
5252 struct nfs_fh fh;
5253 nfs4_stateid stateid;
5254 unsigned long timestamp;
5255 struct nfs_fattr fattr;
5256 int rpc_status;
5257 struct inode *inode;
5258 bool roc;
5259 u32 roc_barrier;
5260 };
5261
5262 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5263 {
5264 struct nfs4_delegreturndata *data = calldata;
5265
5266 if (!nfs4_sequence_done(task, &data->res.seq_res))
5267 return;
5268
5269 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5270 switch (task->tk_status) {
5271 case 0:
5272 renew_lease(data->res.server, data->timestamp);
5273 case -NFS4ERR_ADMIN_REVOKED:
5274 case -NFS4ERR_DELEG_REVOKED:
5275 case -NFS4ERR_BAD_STATEID:
5276 case -NFS4ERR_OLD_STATEID:
5277 case -NFS4ERR_STALE_STATEID:
5278 case -NFS4ERR_EXPIRED:
5279 task->tk_status = 0;
5280 if (data->roc)
5281 pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5282 break;
5283 default:
5284 if (nfs4_async_handle_error(task, data->res.server,
5285 NULL, NULL) == -EAGAIN) {
5286 rpc_restart_call_prepare(task);
5287 return;
5288 }
5289 }
5290 data->rpc_status = task->tk_status;
5291 }
5292
5293 static void nfs4_delegreturn_release(void *calldata)
5294 {
5295 struct nfs4_delegreturndata *data = calldata;
5296 struct inode *inode = data->inode;
5297
5298 if (inode) {
5299 if (data->roc)
5300 pnfs_roc_release(inode);
5301 nfs_iput_and_deactive(inode);
5302 }
5303 kfree(calldata);
5304 }
5305
5306 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5307 {
5308 struct nfs4_delegreturndata *d_data;
5309
5310 d_data = (struct nfs4_delegreturndata *)data;
5311
5312 if (d_data->roc &&
5313 pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5314 return;
5315
5316 nfs4_setup_sequence(d_data->res.server,
5317 &d_data->args.seq_args,
5318 &d_data->res.seq_res,
5319 task);
5320 }
5321
5322 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5323 .rpc_call_prepare = nfs4_delegreturn_prepare,
5324 .rpc_call_done = nfs4_delegreturn_done,
5325 .rpc_release = nfs4_delegreturn_release,
5326 };
5327
5328 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5329 {
5330 struct nfs4_delegreturndata *data;
5331 struct nfs_server *server = NFS_SERVER(inode);
5332 struct rpc_task *task;
5333 struct rpc_message msg = {
5334 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5335 .rpc_cred = cred,
5336 };
5337 struct rpc_task_setup task_setup_data = {
5338 .rpc_client = server->client,
5339 .rpc_message = &msg,
5340 .callback_ops = &nfs4_delegreturn_ops,
5341 .flags = RPC_TASK_ASYNC,
5342 };
5343 int status = 0;
5344
5345 data = kzalloc(sizeof(*data), GFP_NOFS);
5346 if (data == NULL)
5347 return -ENOMEM;
5348 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5349 data->args.fhandle = &data->fh;
5350 data->args.stateid = &data->stateid;
5351 data->args.bitmask = server->cache_consistency_bitmask;
5352 nfs_copy_fh(&data->fh, NFS_FH(inode));
5353 nfs4_stateid_copy(&data->stateid, stateid);
5354 data->res.fattr = &data->fattr;
5355 data->res.server = server;
5356 nfs_fattr_init(data->res.fattr);
5357 data->timestamp = jiffies;
5358 data->rpc_status = 0;
5359 data->inode = nfs_igrab_and_active(inode);
5360 if (data->inode)
5361 data->roc = nfs4_roc(inode);
5362
5363 task_setup_data.callback_data = data;
5364 msg.rpc_argp = &data->args;
5365 msg.rpc_resp = &data->res;
5366 task = rpc_run_task(&task_setup_data);
5367 if (IS_ERR(task))
5368 return PTR_ERR(task);
5369 if (!issync)
5370 goto out;
5371 status = nfs4_wait_for_completion_rpc_task(task);
5372 if (status != 0)
5373 goto out;
5374 status = data->rpc_status;
5375 if (status == 0)
5376 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5377 else
5378 nfs_refresh_inode(inode, &data->fattr);
5379 out:
5380 rpc_put_task(task);
5381 return status;
5382 }
5383
5384 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5385 {
5386 struct nfs_server *server = NFS_SERVER(inode);
5387 struct nfs4_exception exception = { };
5388 int err;
5389 do {
5390 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5391 trace_nfs4_delegreturn(inode, err);
5392 switch (err) {
5393 case -NFS4ERR_STALE_STATEID:
5394 case -NFS4ERR_EXPIRED:
5395 case 0:
5396 return 0;
5397 }
5398 err = nfs4_handle_exception(server, err, &exception);
5399 } while (exception.retry);
5400 return err;
5401 }
5402
5403 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5404 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5405
5406 /*
5407 * sleep, with exponential backoff, and retry the LOCK operation.
5408 */
5409 static unsigned long
5410 nfs4_set_lock_task_retry(unsigned long timeout)
5411 {
5412 freezable_schedule_timeout_killable_unsafe(timeout);
5413 timeout <<= 1;
5414 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5415 return NFS4_LOCK_MAXTIMEOUT;
5416 return timeout;
5417 }
5418
5419 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5420 {
5421 struct inode *inode = state->inode;
5422 struct nfs_server *server = NFS_SERVER(inode);
5423 struct nfs_client *clp = server->nfs_client;
5424 struct nfs_lockt_args arg = {
5425 .fh = NFS_FH(inode),
5426 .fl = request,
5427 };
5428 struct nfs_lockt_res res = {
5429 .denied = request,
5430 };
5431 struct rpc_message msg = {
5432 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5433 .rpc_argp = &arg,
5434 .rpc_resp = &res,
5435 .rpc_cred = state->owner->so_cred,
5436 };
5437 struct nfs4_lock_state *lsp;
5438 int status;
5439
5440 arg.lock_owner.clientid = clp->cl_clientid;
5441 status = nfs4_set_lock_state(state, request);
5442 if (status != 0)
5443 goto out;
5444 lsp = request->fl_u.nfs4_fl.owner;
5445 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5446 arg.lock_owner.s_dev = server->s_dev;
5447 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5448 switch (status) {
5449 case 0:
5450 request->fl_type = F_UNLCK;
5451 break;
5452 case -NFS4ERR_DENIED:
5453 status = 0;
5454 }
5455 request->fl_ops->fl_release_private(request);
5456 request->fl_ops = NULL;
5457 out:
5458 return status;
5459 }
5460
5461 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5462 {
5463 struct nfs4_exception exception = { };
5464 int err;
5465
5466 do {
5467 err = _nfs4_proc_getlk(state, cmd, request);
5468 trace_nfs4_get_lock(request, state, cmd, err);
5469 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5470 &exception);
5471 } while (exception.retry);
5472 return err;
5473 }
5474
5475 static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
5476 {
5477 int res = 0;
5478 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5479 case FL_POSIX:
5480 res = posix_lock_inode_wait(inode, fl);
5481 break;
5482 case FL_FLOCK:
5483 res = flock_lock_inode_wait(inode, fl);
5484 break;
5485 default:
5486 BUG();
5487 }
5488 return res;
5489 }
5490
5491 struct nfs4_unlockdata {
5492 struct nfs_locku_args arg;
5493 struct nfs_locku_res res;
5494 struct nfs4_lock_state *lsp;
5495 struct nfs_open_context *ctx;
5496 struct file_lock fl;
5497 const struct nfs_server *server;
5498 unsigned long timestamp;
5499 };
5500
5501 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5502 struct nfs_open_context *ctx,
5503 struct nfs4_lock_state *lsp,
5504 struct nfs_seqid *seqid)
5505 {
5506 struct nfs4_unlockdata *p;
5507 struct inode *inode = lsp->ls_state->inode;
5508
5509 p = kzalloc(sizeof(*p), GFP_NOFS);
5510 if (p == NULL)
5511 return NULL;
5512 p->arg.fh = NFS_FH(inode);
5513 p->arg.fl = &p->fl;
5514 p->arg.seqid = seqid;
5515 p->res.seqid = seqid;
5516 p->lsp = lsp;
5517 atomic_inc(&lsp->ls_count);
5518 /* Ensure we don't close file until we're done freeing locks! */
5519 p->ctx = get_nfs_open_context(ctx);
5520 memcpy(&p->fl, fl, sizeof(p->fl));
5521 p->server = NFS_SERVER(inode);
5522 return p;
5523 }
5524
5525 static void nfs4_locku_release_calldata(void *data)
5526 {
5527 struct nfs4_unlockdata *calldata = data;
5528 nfs_free_seqid(calldata->arg.seqid);
5529 nfs4_put_lock_state(calldata->lsp);
5530 put_nfs_open_context(calldata->ctx);
5531 kfree(calldata);
5532 }
5533
5534 static void nfs4_locku_done(struct rpc_task *task, void *data)
5535 {
5536 struct nfs4_unlockdata *calldata = data;
5537
5538 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5539 return;
5540 switch (task->tk_status) {
5541 case 0:
5542 renew_lease(calldata->server, calldata->timestamp);
5543 do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5544 if (nfs4_update_lock_stateid(calldata->lsp,
5545 &calldata->res.stateid))
5546 break;
5547 case -NFS4ERR_BAD_STATEID:
5548 case -NFS4ERR_OLD_STATEID:
5549 case -NFS4ERR_STALE_STATEID:
5550 case -NFS4ERR_EXPIRED:
5551 if (!nfs4_stateid_match(&calldata->arg.stateid,
5552 &calldata->lsp->ls_stateid))
5553 rpc_restart_call_prepare(task);
5554 break;
5555 default:
5556 if (nfs4_async_handle_error(task, calldata->server,
5557 NULL, NULL) == -EAGAIN)
5558 rpc_restart_call_prepare(task);
5559 }
5560 nfs_release_seqid(calldata->arg.seqid);
5561 }
5562
5563 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5564 {
5565 struct nfs4_unlockdata *calldata = data;
5566
5567 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5568 goto out_wait;
5569 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5570 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5571 /* Note: exit _without_ running nfs4_locku_done */
5572 goto out_no_action;
5573 }
5574 calldata->timestamp = jiffies;
5575 if (nfs4_setup_sequence(calldata->server,
5576 &calldata->arg.seq_args,
5577 &calldata->res.seq_res,
5578 task) != 0)
5579 nfs_release_seqid(calldata->arg.seqid);
5580 return;
5581 out_no_action:
5582 task->tk_action = NULL;
5583 out_wait:
5584 nfs4_sequence_done(task, &calldata->res.seq_res);
5585 }
5586
5587 static const struct rpc_call_ops nfs4_locku_ops = {
5588 .rpc_call_prepare = nfs4_locku_prepare,
5589 .rpc_call_done = nfs4_locku_done,
5590 .rpc_release = nfs4_locku_release_calldata,
5591 };
5592
5593 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5594 struct nfs_open_context *ctx,
5595 struct nfs4_lock_state *lsp,
5596 struct nfs_seqid *seqid)
5597 {
5598 struct nfs4_unlockdata *data;
5599 struct rpc_message msg = {
5600 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5601 .rpc_cred = ctx->cred,
5602 };
5603 struct rpc_task_setup task_setup_data = {
5604 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5605 .rpc_message = &msg,
5606 .callback_ops = &nfs4_locku_ops,
5607 .workqueue = nfsiod_workqueue,
5608 .flags = RPC_TASK_ASYNC,
5609 };
5610
5611 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5612 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5613
5614 /* Ensure this is an unlock - when canceling a lock, the
5615 * canceled lock is passed in, and it won't be an unlock.
5616 */
5617 fl->fl_type = F_UNLCK;
5618
5619 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5620 if (data == NULL) {
5621 nfs_free_seqid(seqid);
5622 return ERR_PTR(-ENOMEM);
5623 }
5624
5625 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5626 msg.rpc_argp = &data->arg;
5627 msg.rpc_resp = &data->res;
5628 task_setup_data.callback_data = data;
5629 return rpc_run_task(&task_setup_data);
5630 }
5631
5632 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5633 {
5634 struct inode *inode = state->inode;
5635 struct nfs4_state_owner *sp = state->owner;
5636 struct nfs_inode *nfsi = NFS_I(inode);
5637 struct nfs_seqid *seqid;
5638 struct nfs4_lock_state *lsp;
5639 struct rpc_task *task;
5640 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5641 int status = 0;
5642 unsigned char fl_flags = request->fl_flags;
5643
5644 status = nfs4_set_lock_state(state, request);
5645 /* Unlock _before_ we do the RPC call */
5646 request->fl_flags |= FL_EXISTS;
5647 /* Exclude nfs_delegation_claim_locks() */
5648 mutex_lock(&sp->so_delegreturn_mutex);
5649 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5650 down_read(&nfsi->rwsem);
5651 if (do_vfs_lock(inode, request) == -ENOENT) {
5652 up_read(&nfsi->rwsem);
5653 mutex_unlock(&sp->so_delegreturn_mutex);
5654 goto out;
5655 }
5656 up_read(&nfsi->rwsem);
5657 mutex_unlock(&sp->so_delegreturn_mutex);
5658 if (status != 0)
5659 goto out;
5660 /* Is this a delegated lock? */
5661 lsp = request->fl_u.nfs4_fl.owner;
5662 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5663 goto out;
5664 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5665 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5666 status = -ENOMEM;
5667 if (IS_ERR(seqid))
5668 goto out;
5669 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5670 status = PTR_ERR(task);
5671 if (IS_ERR(task))
5672 goto out;
5673 status = nfs4_wait_for_completion_rpc_task(task);
5674 rpc_put_task(task);
5675 out:
5676 request->fl_flags = fl_flags;
5677 trace_nfs4_unlock(request, state, F_SETLK, status);
5678 return status;
5679 }
5680
5681 struct nfs4_lockdata {
5682 struct nfs_lock_args arg;
5683 struct nfs_lock_res res;
5684 struct nfs4_lock_state *lsp;
5685 struct nfs_open_context *ctx;
5686 struct file_lock fl;
5687 unsigned long timestamp;
5688 int rpc_status;
5689 int cancelled;
5690 struct nfs_server *server;
5691 };
5692
5693 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5694 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5695 gfp_t gfp_mask)
5696 {
5697 struct nfs4_lockdata *p;
5698 struct inode *inode = lsp->ls_state->inode;
5699 struct nfs_server *server = NFS_SERVER(inode);
5700 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5701
5702 p = kzalloc(sizeof(*p), gfp_mask);
5703 if (p == NULL)
5704 return NULL;
5705
5706 p->arg.fh = NFS_FH(inode);
5707 p->arg.fl = &p->fl;
5708 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5709 if (IS_ERR(p->arg.open_seqid))
5710 goto out_free;
5711 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5712 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5713 if (IS_ERR(p->arg.lock_seqid))
5714 goto out_free_seqid;
5715 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5716 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5717 p->arg.lock_owner.s_dev = server->s_dev;
5718 p->res.lock_seqid = p->arg.lock_seqid;
5719 p->lsp = lsp;
5720 p->server = server;
5721 atomic_inc(&lsp->ls_count);
5722 p->ctx = get_nfs_open_context(ctx);
5723 get_file(fl->fl_file);
5724 memcpy(&p->fl, fl, sizeof(p->fl));
5725 return p;
5726 out_free_seqid:
5727 nfs_free_seqid(p->arg.open_seqid);
5728 out_free:
5729 kfree(p);
5730 return NULL;
5731 }
5732
5733 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5734 {
5735 struct nfs4_lockdata *data = calldata;
5736 struct nfs4_state *state = data->lsp->ls_state;
5737
5738 dprintk("%s: begin!\n", __func__);
5739 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5740 goto out_wait;
5741 /* Do we need to do an open_to_lock_owner? */
5742 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5743 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5744 goto out_release_lock_seqid;
5745 }
5746 nfs4_stateid_copy(&data->arg.open_stateid,
5747 &state->open_stateid);
5748 data->arg.new_lock_owner = 1;
5749 data->res.open_seqid = data->arg.open_seqid;
5750 } else {
5751 data->arg.new_lock_owner = 0;
5752 nfs4_stateid_copy(&data->arg.lock_stateid,
5753 &data->lsp->ls_stateid);
5754 }
5755 if (!nfs4_valid_open_stateid(state)) {
5756 data->rpc_status = -EBADF;
5757 task->tk_action = NULL;
5758 goto out_release_open_seqid;
5759 }
5760 data->timestamp = jiffies;
5761 if (nfs4_setup_sequence(data->server,
5762 &data->arg.seq_args,
5763 &data->res.seq_res,
5764 task) == 0)
5765 return;
5766 out_release_open_seqid:
5767 nfs_release_seqid(data->arg.open_seqid);
5768 out_release_lock_seqid:
5769 nfs_release_seqid(data->arg.lock_seqid);
5770 out_wait:
5771 nfs4_sequence_done(task, &data->res.seq_res);
5772 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5773 }
5774
5775 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5776 {
5777 struct nfs4_lockdata *data = calldata;
5778 struct nfs4_lock_state *lsp = data->lsp;
5779
5780 dprintk("%s: begin!\n", __func__);
5781
5782 if (!nfs4_sequence_done(task, &data->res.seq_res))
5783 return;
5784
5785 data->rpc_status = task->tk_status;
5786 switch (task->tk_status) {
5787 case 0:
5788 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5789 data->timestamp);
5790 if (data->arg.new_lock) {
5791 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5792 if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5793 rpc_restart_call_prepare(task);
5794 break;
5795 }
5796 }
5797 if (data->arg.new_lock_owner != 0) {
5798 nfs_confirm_seqid(&lsp->ls_seqid, 0);
5799 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5800 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5801 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5802 rpc_restart_call_prepare(task);
5803 break;
5804 case -NFS4ERR_BAD_STATEID:
5805 case -NFS4ERR_OLD_STATEID:
5806 case -NFS4ERR_STALE_STATEID:
5807 case -NFS4ERR_EXPIRED:
5808 if (data->arg.new_lock_owner != 0) {
5809 if (!nfs4_stateid_match(&data->arg.open_stateid,
5810 &lsp->ls_state->open_stateid))
5811 rpc_restart_call_prepare(task);
5812 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5813 &lsp->ls_stateid))
5814 rpc_restart_call_prepare(task);
5815 }
5816 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5817 }
5818
5819 static void nfs4_lock_release(void *calldata)
5820 {
5821 struct nfs4_lockdata *data = calldata;
5822
5823 dprintk("%s: begin!\n", __func__);
5824 nfs_free_seqid(data->arg.open_seqid);
5825 if (data->cancelled != 0) {
5826 struct rpc_task *task;
5827 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5828 data->arg.lock_seqid);
5829 if (!IS_ERR(task))
5830 rpc_put_task_async(task);
5831 dprintk("%s: cancelling lock!\n", __func__);
5832 } else
5833 nfs_free_seqid(data->arg.lock_seqid);
5834 nfs4_put_lock_state(data->lsp);
5835 put_nfs_open_context(data->ctx);
5836 fput(data->fl.fl_file);
5837 kfree(data);
5838 dprintk("%s: done!\n", __func__);
5839 }
5840
5841 static const struct rpc_call_ops nfs4_lock_ops = {
5842 .rpc_call_prepare = nfs4_lock_prepare,
5843 .rpc_call_done = nfs4_lock_done,
5844 .rpc_release = nfs4_lock_release,
5845 };
5846
5847 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5848 {
5849 switch (error) {
5850 case -NFS4ERR_ADMIN_REVOKED:
5851 case -NFS4ERR_BAD_STATEID:
5852 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5853 if (new_lock_owner != 0 ||
5854 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5855 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5856 break;
5857 case -NFS4ERR_STALE_STATEID:
5858 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5859 case -NFS4ERR_EXPIRED:
5860 nfs4_schedule_lease_recovery(server->nfs_client);
5861 };
5862 }
5863
5864 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5865 {
5866 struct nfs4_lockdata *data;
5867 struct rpc_task *task;
5868 struct rpc_message msg = {
5869 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5870 .rpc_cred = state->owner->so_cred,
5871 };
5872 struct rpc_task_setup task_setup_data = {
5873 .rpc_client = NFS_CLIENT(state->inode),
5874 .rpc_message = &msg,
5875 .callback_ops = &nfs4_lock_ops,
5876 .workqueue = nfsiod_workqueue,
5877 .flags = RPC_TASK_ASYNC,
5878 };
5879 int ret;
5880
5881 dprintk("%s: begin!\n", __func__);
5882 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5883 fl->fl_u.nfs4_fl.owner,
5884 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5885 if (data == NULL)
5886 return -ENOMEM;
5887 if (IS_SETLKW(cmd))
5888 data->arg.block = 1;
5889 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5890 msg.rpc_argp = &data->arg;
5891 msg.rpc_resp = &data->res;
5892 task_setup_data.callback_data = data;
5893 if (recovery_type > NFS_LOCK_NEW) {
5894 if (recovery_type == NFS_LOCK_RECLAIM)
5895 data->arg.reclaim = NFS_LOCK_RECLAIM;
5896 nfs4_set_sequence_privileged(&data->arg.seq_args);
5897 } else
5898 data->arg.new_lock = 1;
5899 task = rpc_run_task(&task_setup_data);
5900 if (IS_ERR(task))
5901 return PTR_ERR(task);
5902 ret = nfs4_wait_for_completion_rpc_task(task);
5903 if (ret == 0) {
5904 ret = data->rpc_status;
5905 if (ret)
5906 nfs4_handle_setlk_error(data->server, data->lsp,
5907 data->arg.new_lock_owner, ret);
5908 } else
5909 data->cancelled = 1;
5910 rpc_put_task(task);
5911 dprintk("%s: done, ret = %d!\n", __func__, ret);
5912 return ret;
5913 }
5914
5915 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5916 {
5917 struct nfs_server *server = NFS_SERVER(state->inode);
5918 struct nfs4_exception exception = {
5919 .inode = state->inode,
5920 };
5921 int err;
5922
5923 do {
5924 /* Cache the lock if possible... */
5925 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5926 return 0;
5927 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5928 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5929 if (err != -NFS4ERR_DELAY)
5930 break;
5931 nfs4_handle_exception(server, err, &exception);
5932 } while (exception.retry);
5933 return err;
5934 }
5935
5936 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5937 {
5938 struct nfs_server *server = NFS_SERVER(state->inode);
5939 struct nfs4_exception exception = {
5940 .inode = state->inode,
5941 };
5942 int err;
5943
5944 err = nfs4_set_lock_state(state, request);
5945 if (err != 0)
5946 return err;
5947 if (!recover_lost_locks) {
5948 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5949 return 0;
5950 }
5951 do {
5952 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5953 return 0;
5954 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5955 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5956 switch (err) {
5957 default:
5958 goto out;
5959 case -NFS4ERR_GRACE:
5960 case -NFS4ERR_DELAY:
5961 nfs4_handle_exception(server, err, &exception);
5962 err = 0;
5963 }
5964 } while (exception.retry);
5965 out:
5966 return err;
5967 }
5968
5969 #if defined(CONFIG_NFS_V4_1)
5970 /**
5971 * nfs41_check_expired_locks - possibly free a lock stateid
5972 *
5973 * @state: NFSv4 state for an inode
5974 *
5975 * Returns NFS_OK if recovery for this stateid is now finished.
5976 * Otherwise a negative NFS4ERR value is returned.
5977 */
5978 static int nfs41_check_expired_locks(struct nfs4_state *state)
5979 {
5980 int status, ret = -NFS4ERR_BAD_STATEID;
5981 struct nfs4_lock_state *lsp;
5982 struct nfs_server *server = NFS_SERVER(state->inode);
5983
5984 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5985 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5986 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5987
5988 status = nfs41_test_stateid(server,
5989 &lsp->ls_stateid,
5990 cred);
5991 trace_nfs4_test_lock_stateid(state, lsp, status);
5992 if (status != NFS_OK) {
5993 /* Free the stateid unless the server
5994 * informs us the stateid is unrecognized. */
5995 if (status != -NFS4ERR_BAD_STATEID)
5996 nfs41_free_stateid(server,
5997 &lsp->ls_stateid,
5998 cred);
5999 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6000 ret = status;
6001 }
6002 }
6003 };
6004
6005 return ret;
6006 }
6007
6008 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6009 {
6010 int status = NFS_OK;
6011
6012 if (test_bit(LK_STATE_IN_USE, &state->flags))
6013 status = nfs41_check_expired_locks(state);
6014 if (status != NFS_OK)
6015 status = nfs4_lock_expired(state, request);
6016 return status;
6017 }
6018 #endif
6019
6020 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6021 {
6022 struct nfs_inode *nfsi = NFS_I(state->inode);
6023 unsigned char fl_flags = request->fl_flags;
6024 int status = -ENOLCK;
6025
6026 if ((fl_flags & FL_POSIX) &&
6027 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6028 goto out;
6029 /* Is this a delegated open? */
6030 status = nfs4_set_lock_state(state, request);
6031 if (status != 0)
6032 goto out;
6033 request->fl_flags |= FL_ACCESS;
6034 status = do_vfs_lock(state->inode, request);
6035 if (status < 0)
6036 goto out;
6037 down_read(&nfsi->rwsem);
6038 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6039 /* Yes: cache locks! */
6040 /* ...but avoid races with delegation recall... */
6041 request->fl_flags = fl_flags & ~FL_SLEEP;
6042 status = do_vfs_lock(state->inode, request);
6043 up_read(&nfsi->rwsem);
6044 goto out;
6045 }
6046 up_read(&nfsi->rwsem);
6047 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6048 out:
6049 request->fl_flags = fl_flags;
6050 return status;
6051 }
6052
6053 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6054 {
6055 struct nfs4_exception exception = {
6056 .state = state,
6057 .inode = state->inode,
6058 };
6059 int err;
6060
6061 do {
6062 err = _nfs4_proc_setlk(state, cmd, request);
6063 trace_nfs4_set_lock(request, state, cmd, err);
6064 if (err == -NFS4ERR_DENIED)
6065 err = -EAGAIN;
6066 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6067 err, &exception);
6068 } while (exception.retry);
6069 return err;
6070 }
6071
6072 static int
6073 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6074 {
6075 struct nfs_open_context *ctx;
6076 struct nfs4_state *state;
6077 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6078 int status;
6079
6080 /* verify open state */
6081 ctx = nfs_file_open_context(filp);
6082 state = ctx->state;
6083
6084 if (request->fl_start < 0 || request->fl_end < 0)
6085 return -EINVAL;
6086
6087 if (IS_GETLK(cmd)) {
6088 if (state != NULL)
6089 return nfs4_proc_getlk(state, F_GETLK, request);
6090 return 0;
6091 }
6092
6093 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6094 return -EINVAL;
6095
6096 if (request->fl_type == F_UNLCK) {
6097 if (state != NULL)
6098 return nfs4_proc_unlck(state, cmd, request);
6099 return 0;
6100 }
6101
6102 if (state == NULL)
6103 return -ENOLCK;
6104 /*
6105 * Don't rely on the VFS having checked the file open mode,
6106 * since it won't do this for flock() locks.
6107 */
6108 switch (request->fl_type) {
6109 case F_RDLCK:
6110 if (!(filp->f_mode & FMODE_READ))
6111 return -EBADF;
6112 break;
6113 case F_WRLCK:
6114 if (!(filp->f_mode & FMODE_WRITE))
6115 return -EBADF;
6116 }
6117
6118 do {
6119 status = nfs4_proc_setlk(state, cmd, request);
6120 if ((status != -EAGAIN) || IS_SETLK(cmd))
6121 break;
6122 timeout = nfs4_set_lock_task_retry(timeout);
6123 status = -ERESTARTSYS;
6124 if (signalled())
6125 break;
6126 } while(status < 0);
6127 return status;
6128 }
6129
6130 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6131 {
6132 struct nfs_server *server = NFS_SERVER(state->inode);
6133 int err;
6134
6135 err = nfs4_set_lock_state(state, fl);
6136 if (err != 0)
6137 return err;
6138 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6139 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6140 }
6141
6142 struct nfs_release_lockowner_data {
6143 struct nfs4_lock_state *lsp;
6144 struct nfs_server *server;
6145 struct nfs_release_lockowner_args args;
6146 struct nfs_release_lockowner_res res;
6147 unsigned long timestamp;
6148 };
6149
6150 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6151 {
6152 struct nfs_release_lockowner_data *data = calldata;
6153 struct nfs_server *server = data->server;
6154 nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6155 &data->args.seq_args, &data->res.seq_res, task);
6156 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6157 data->timestamp = jiffies;
6158 }
6159
6160 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6161 {
6162 struct nfs_release_lockowner_data *data = calldata;
6163 struct nfs_server *server = data->server;
6164
6165 nfs40_sequence_done(task, &data->res.seq_res);
6166
6167 switch (task->tk_status) {
6168 case 0:
6169 renew_lease(server, data->timestamp);
6170 break;
6171 case -NFS4ERR_STALE_CLIENTID:
6172 case -NFS4ERR_EXPIRED:
6173 nfs4_schedule_lease_recovery(server->nfs_client);
6174 break;
6175 case -NFS4ERR_LEASE_MOVED:
6176 case -NFS4ERR_DELAY:
6177 if (nfs4_async_handle_error(task, server,
6178 NULL, NULL) == -EAGAIN)
6179 rpc_restart_call_prepare(task);
6180 }
6181 }
6182
6183 static void nfs4_release_lockowner_release(void *calldata)
6184 {
6185 struct nfs_release_lockowner_data *data = calldata;
6186 nfs4_free_lock_state(data->server, data->lsp);
6187 kfree(calldata);
6188 }
6189
6190 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6191 .rpc_call_prepare = nfs4_release_lockowner_prepare,
6192 .rpc_call_done = nfs4_release_lockowner_done,
6193 .rpc_release = nfs4_release_lockowner_release,
6194 };
6195
6196 static void
6197 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6198 {
6199 struct nfs_release_lockowner_data *data;
6200 struct rpc_message msg = {
6201 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6202 };
6203
6204 if (server->nfs_client->cl_mvops->minor_version != 0)
6205 return;
6206
6207 data = kmalloc(sizeof(*data), GFP_NOFS);
6208 if (!data)
6209 return;
6210 data->lsp = lsp;
6211 data->server = server;
6212 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6213 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6214 data->args.lock_owner.s_dev = server->s_dev;
6215
6216 msg.rpc_argp = &data->args;
6217 msg.rpc_resp = &data->res;
6218 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6219 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6220 }
6221
6222 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6223
6224 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6225 const void *buf, size_t buflen,
6226 int flags, int type)
6227 {
6228 if (strcmp(key, "") != 0)
6229 return -EINVAL;
6230
6231 return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
6232 }
6233
6234 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6235 void *buf, size_t buflen, int type)
6236 {
6237 if (strcmp(key, "") != 0)
6238 return -EINVAL;
6239
6240 return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
6241 }
6242
6243 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6244 size_t list_len, const char *name,
6245 size_t name_len, int type)
6246 {
6247 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6248
6249 if (!nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))))
6250 return 0;
6251
6252 if (list && len <= list_len)
6253 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6254 return len;
6255 }
6256
6257 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6258 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6259 {
6260 return server->caps & NFS_CAP_SECURITY_LABEL;