projects / linux-2.6-block.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
NFSv4: Fix an atomicity problem in CLOSE
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
... / ...
CommitLineData
1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/delay.h>
40#include <linux/errno.h>
41#include <linux/string.h>
42#include <linux/ratelimit.h>
43#include <linux/printk.h>
44#include <linux/slab.h>
45#include <linux/sunrpc/clnt.h>
46#include <linux/nfs.h>
47#include <linux/nfs4.h>
48#include <linux/nfs_fs.h>
49#include <linux/nfs_page.h>
50#include <linux/nfs_mount.h>
51#include <linux/namei.h>
52#include <linux/mount.h>
53#include <linux/module.h>
54#include <linux/nfs_idmap.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 "nfs4session.h"
67#include "fscache.h"
68
69#include "nfs4trace.h"
70
71#define NFSDBG_FACILITY NFSDBG_PROC
72
73#define NFS4_POLL_RETRY_MIN (HZ/10)
74#define NFS4_POLL_RETRY_MAX (15*HZ)
75
76struct nfs4_opendata;
77static int _nfs4_proc_open(struct nfs4_opendata *data);
78static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
79static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
80static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
81static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
82static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
83static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
84static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
85 struct nfs_fattr *fattr, struct iattr *sattr,
86 struct nfs4_state *state, struct nfs4_label *ilabel,
87 struct nfs4_label *olabel);
88#ifdef CONFIG_NFS_V4_1
89static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
90 struct rpc_cred *);
91static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
92 struct rpc_cred *);
93#endif
94
95#ifdef CONFIG_NFS_V4_SECURITY_LABEL
96static inline struct nfs4_label *
97nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
98 struct iattr *sattr, struct nfs4_label *label)
99{
100 int err;
101
102 if (label == NULL)
103 return NULL;
104
105 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
106 return NULL;
107
108 err = security_dentry_init_security(dentry, sattr->ia_mode,
109 &dentry->d_name, (void **)&label->label, &label->len);
110 if (err == 0)
111 return label;
112
113 return NULL;
114}
115static inline void
116nfs4_label_release_security(struct nfs4_label *label)
117{
118 if (label)
119 security_release_secctx(label->label, label->len);
120}
121static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
122{
123 if (label)
124 return server->attr_bitmask;
125
126 return server->attr_bitmask_nl;
127}
128#else
129static inline struct nfs4_label *
130nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
131 struct iattr *sattr, struct nfs4_label *l)
132{ return NULL; }
133static inline void
134nfs4_label_release_security(struct nfs4_label *label)
135{ return; }
136static inline u32 *
137nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
138{ return server->attr_bitmask; }
139#endif
140
141/* Prevent leaks of NFSv4 errors into userland */
142static int nfs4_map_errors(int err)
143{
144 if (err >= -1000)
145 return err;
146 switch (err) {
147 case -NFS4ERR_RESOURCE:
148 case -NFS4ERR_LAYOUTTRYLATER:
149 case -NFS4ERR_RECALLCONFLICT:
150 return -EREMOTEIO;
151 case -NFS4ERR_WRONGSEC:
152 case -NFS4ERR_WRONG_CRED:
153 return -EPERM;
154 case -NFS4ERR_BADOWNER:
155 case -NFS4ERR_BADNAME:
156 return -EINVAL;
157 case -NFS4ERR_SHARE_DENIED:
158 return -EACCES;
159 case -NFS4ERR_MINOR_VERS_MISMATCH:
160 return -EPROTONOSUPPORT;
161 case -NFS4ERR_FILE_OPEN:
162 return -EBUSY;
163 default:
164 dprintk("%s could not handle NFSv4 error %d\n",
165 __func__, -err);
166 break;
167 }
168 return -EIO;
169}
170
171/*
172 * This is our standard bitmap for GETATTR requests.
173 */
174const u32 nfs4_fattr_bitmap[3] = {
175 FATTR4_WORD0_TYPE
176 | FATTR4_WORD0_CHANGE
177 | FATTR4_WORD0_SIZE
178 | FATTR4_WORD0_FSID
179 | FATTR4_WORD0_FILEID,
180 FATTR4_WORD1_MODE
181 | FATTR4_WORD1_NUMLINKS
182 | FATTR4_WORD1_OWNER
183 | FATTR4_WORD1_OWNER_GROUP
184 | FATTR4_WORD1_RAWDEV
185 | FATTR4_WORD1_SPACE_USED
186 | FATTR4_WORD1_TIME_ACCESS
187 | FATTR4_WORD1_TIME_METADATA
188 | FATTR4_WORD1_TIME_MODIFY,
189#ifdef CONFIG_NFS_V4_SECURITY_LABEL
190 FATTR4_WORD2_SECURITY_LABEL
191#endif
192};
193
194static const u32 nfs4_pnfs_open_bitmap[3] = {
195 FATTR4_WORD0_TYPE
196 | FATTR4_WORD0_CHANGE
197 | FATTR4_WORD0_SIZE
198 | FATTR4_WORD0_FSID
199 | FATTR4_WORD0_FILEID,
200 FATTR4_WORD1_MODE
201 | FATTR4_WORD1_NUMLINKS
202 | FATTR4_WORD1_OWNER
203 | FATTR4_WORD1_OWNER_GROUP
204 | FATTR4_WORD1_RAWDEV
205 | FATTR4_WORD1_SPACE_USED
206 | FATTR4_WORD1_TIME_ACCESS
207 | FATTR4_WORD1_TIME_METADATA
208 | FATTR4_WORD1_TIME_MODIFY,
209 FATTR4_WORD2_MDSTHRESHOLD
210};
211
212static const u32 nfs4_open_noattr_bitmap[3] = {
213 FATTR4_WORD0_TYPE
214 | FATTR4_WORD0_CHANGE
215 | FATTR4_WORD0_FILEID,
216};
217
218const u32 nfs4_statfs_bitmap[3] = {
219 FATTR4_WORD0_FILES_AVAIL
220 | FATTR4_WORD0_FILES_FREE
221 | FATTR4_WORD0_FILES_TOTAL,
222 FATTR4_WORD1_SPACE_AVAIL
223 | FATTR4_WORD1_SPACE_FREE
224 | FATTR4_WORD1_SPACE_TOTAL
225};
226
227const u32 nfs4_pathconf_bitmap[3] = {
228 FATTR4_WORD0_MAXLINK
229 | FATTR4_WORD0_MAXNAME,
230 0
231};
232
233const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
234 | FATTR4_WORD0_MAXREAD
235 | FATTR4_WORD0_MAXWRITE
236 | FATTR4_WORD0_LEASE_TIME,
237 FATTR4_WORD1_TIME_DELTA
238 | FATTR4_WORD1_FS_LAYOUT_TYPES,
239 FATTR4_WORD2_LAYOUT_BLKSIZE
240};
241
242const u32 nfs4_fs_locations_bitmap[3] = {
243 FATTR4_WORD0_TYPE
244 | FATTR4_WORD0_CHANGE
245 | FATTR4_WORD0_SIZE
246 | FATTR4_WORD0_FSID
247 | FATTR4_WORD0_FILEID
248 | FATTR4_WORD0_FS_LOCATIONS,
249 FATTR4_WORD1_MODE
250 | FATTR4_WORD1_NUMLINKS
251 | FATTR4_WORD1_OWNER
252 | FATTR4_WORD1_OWNER_GROUP
253 | FATTR4_WORD1_RAWDEV
254 | FATTR4_WORD1_SPACE_USED
255 | FATTR4_WORD1_TIME_ACCESS
256 | FATTR4_WORD1_TIME_METADATA
257 | FATTR4_WORD1_TIME_MODIFY
258 | FATTR4_WORD1_MOUNTED_ON_FILEID,
259};
260
261static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
262 struct nfs4_readdir_arg *readdir)
263{
264 __be32 *start, *p;
265
266 if (cookie > 2) {
267 readdir->cookie = cookie;
268 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
269 return;
270 }
271
272 readdir->cookie = 0;
273 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
274 if (cookie == 2)
275 return;
276
277 /*
278 * NFSv4 servers do not return entries for '.' and '..'
279 * Therefore, we fake these entries here. We let '.'
280 * have cookie 0 and '..' have cookie 1. Note that
281 * when talking to the server, we always send cookie 0
282 * instead of 1 or 2.
283 */
284 start = p = kmap_atomic(*readdir->pages);
285
286 if (cookie == 0) {
287 *p++ = xdr_one; /* next */
288 *p++ = xdr_zero; /* cookie, first word */
289 *p++ = xdr_one; /* cookie, second word */
290 *p++ = xdr_one; /* entry len */
291 memcpy(p, ".\0\0\0", 4); /* entry */
292 p++;
293 *p++ = xdr_one; /* bitmap length */
294 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
295 *p++ = htonl(8); /* attribute buffer length */
296 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
297 }
298
299 *p++ = xdr_one; /* next */
300 *p++ = xdr_zero; /* cookie, first word */
301 *p++ = xdr_two; /* cookie, second word */
302 *p++ = xdr_two; /* entry len */
303 memcpy(p, "..\0\0", 4); /* entry */
304 p++;
305 *p++ = xdr_one; /* bitmap length */
306 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
307 *p++ = htonl(8); /* attribute buffer length */
308 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
309
310 readdir->pgbase = (char *)p - (char *)start;
311 readdir->count -= readdir->pgbase;
312 kunmap_atomic(start);
313}
314
315static long nfs4_update_delay(long *timeout)
316{
317 long ret;
318 if (!timeout)
319 return NFS4_POLL_RETRY_MAX;
320 if (*timeout <= 0)
321 *timeout = NFS4_POLL_RETRY_MIN;
322 if (*timeout > NFS4_POLL_RETRY_MAX)
323 *timeout = NFS4_POLL_RETRY_MAX;
324 ret = *timeout;
325 *timeout <<= 1;
326 return ret;
327}
328
329static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
330{
331 int res = 0;
332
333 might_sleep();
334
335 freezable_schedule_timeout_killable_unsafe(
336 nfs4_update_delay(timeout));
337 if (fatal_signal_pending(current))
338 res = -ERESTARTSYS;
339 return res;
340}
341
342/* This is the error handling routine for processes that are allowed
343 * to sleep.
344 */
345int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
346{
347 struct nfs_client *clp = server->nfs_client;
348 struct nfs4_state *state = exception->state;
349 struct inode *inode = exception->inode;
350 int ret = errorcode;
351
352 exception->retry = 0;
353 switch(errorcode) {
354 case 0:
355 return 0;
356 case -NFS4ERR_OPENMODE:
357 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
358 nfs4_inode_return_delegation(inode);
359 exception->retry = 1;
360 return 0;
361 }
362 if (state == NULL)
363 break;
364 ret = nfs4_schedule_stateid_recovery(server, state);
365 if (ret < 0)
366 break;
367 goto wait_on_recovery;
368 case -NFS4ERR_DELEG_REVOKED:
369 case -NFS4ERR_ADMIN_REVOKED:
370 case -NFS4ERR_BAD_STATEID:
371 if (state == NULL)
372 break;
373 ret = nfs4_schedule_stateid_recovery(server, state);
374 if (ret < 0)
375 break;
376 goto wait_on_recovery;
377 case -NFS4ERR_EXPIRED:
378 if (state != NULL) {
379 ret = nfs4_schedule_stateid_recovery(server, state);
380 if (ret < 0)
381 break;
382 }
383 case -NFS4ERR_STALE_STATEID:
384 case -NFS4ERR_STALE_CLIENTID:
385 nfs4_schedule_lease_recovery(clp);
386 goto wait_on_recovery;
387 case -NFS4ERR_MOVED:
388 ret = nfs4_schedule_migration_recovery(server);
389 if (ret < 0)
390 break;
391 goto wait_on_recovery;
392 case -NFS4ERR_LEASE_MOVED:
393 nfs4_schedule_lease_moved_recovery(clp);
394 goto wait_on_recovery;
395#if defined(CONFIG_NFS_V4_1)
396 case -NFS4ERR_BADSESSION:
397 case -NFS4ERR_BADSLOT:
398 case -NFS4ERR_BAD_HIGH_SLOT:
399 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
400 case -NFS4ERR_DEADSESSION:
401 case -NFS4ERR_SEQ_FALSE_RETRY:
402 case -NFS4ERR_SEQ_MISORDERED:
403 dprintk("%s ERROR: %d Reset session\n", __func__,
404 errorcode);
405 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
406 goto wait_on_recovery;
407#endif /* defined(CONFIG_NFS_V4_1) */
408 case -NFS4ERR_FILE_OPEN:
409 if (exception->timeout > HZ) {
410 /* We have retried a decent amount, time to
411 * fail
412 */
413 ret = -EBUSY;
414 break;
415 }
416 case -NFS4ERR_GRACE:
417 case -NFS4ERR_DELAY:
418 ret = nfs4_delay(server->client, &exception->timeout);
419 if (ret != 0)
420 break;
421 case -NFS4ERR_RETRY_UNCACHED_REP:
422 case -NFS4ERR_OLD_STATEID:
423 exception->retry = 1;
424 break;
425 case -NFS4ERR_BADOWNER:
426 /* The following works around a Linux server bug! */
427 case -NFS4ERR_BADNAME:
428 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
429 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
430 exception->retry = 1;
431 printk(KERN_WARNING "NFS: v4 server %s "
432 "does not accept raw "
433 "uid/gids. "
434 "Reenabling the idmapper.\n",
435 server->nfs_client->cl_hostname);
436 }
437 }
438 /* We failed to handle the error */
439 return nfs4_map_errors(ret);
440wait_on_recovery:
441 ret = nfs4_wait_clnt_recover(clp);
442 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
443 return -EIO;
444 if (ret == 0)
445 exception->retry = 1;
446 return ret;
447}
448
449/*
450 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
451 * or 'false' otherwise.
452 */
453static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
454{
455 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
456
457 if (flavor == RPC_AUTH_GSS_KRB5I ||
458 flavor == RPC_AUTH_GSS_KRB5P)
459 return true;
460
461 return false;
462}
463
464static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
465{
466 spin_lock(&clp->cl_lock);
467 if (time_before(clp->cl_last_renewal,timestamp))
468 clp->cl_last_renewal = timestamp;
469 spin_unlock(&clp->cl_lock);
470}
471
472static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
473{
474 do_renew_lease(server->nfs_client, timestamp);
475}
476
477struct nfs4_call_sync_data {
478 const struct nfs_server *seq_server;
479 struct nfs4_sequence_args *seq_args;
480 struct nfs4_sequence_res *seq_res;
481};
482
483static void nfs4_init_sequence(struct nfs4_sequence_args *args,
484 struct nfs4_sequence_res *res, int cache_reply)
485{
486 args->sa_slot = NULL;
487 args->sa_cache_this = cache_reply;
488 args->sa_privileged = 0;
489
490 res->sr_slot = NULL;
491}
492
493static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
494{
495 args->sa_privileged = 1;
496}
497
498static int nfs40_setup_sequence(const struct nfs_server *server,
499 struct nfs4_sequence_args *args,
500 struct nfs4_sequence_res *res,
501 struct rpc_task *task)
502{
503 struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
504 struct nfs4_slot *slot;
505
506 /* slot already allocated? */
507 if (res->sr_slot != NULL)
508 goto out_start;
509
510 spin_lock(&tbl->slot_tbl_lock);
511 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
512 goto out_sleep;
513
514 slot = nfs4_alloc_slot(tbl);
515 if (IS_ERR(slot)) {
516 if (slot == ERR_PTR(-ENOMEM))
517 task->tk_timeout = HZ >> 2;
518 goto out_sleep;
519 }
520 spin_unlock(&tbl->slot_tbl_lock);
521
522 args->sa_slot = slot;
523 res->sr_slot = slot;
524
525out_start:
526 rpc_call_start(task);
527 return 0;
528
529out_sleep:
530 if (args->sa_privileged)
531 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
532 NULL, RPC_PRIORITY_PRIVILEGED);
533 else
534 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
535 spin_unlock(&tbl->slot_tbl_lock);
536 return -EAGAIN;
537}
538
539static int nfs40_sequence_done(struct rpc_task *task,
540 struct nfs4_sequence_res *res)
541{
542 struct nfs4_slot *slot = res->sr_slot;
543 struct nfs4_slot_table *tbl;
544
545 if (slot == NULL)
546 goto out;
547
548 tbl = slot->table;
549 spin_lock(&tbl->slot_tbl_lock);
550 if (!nfs41_wake_and_assign_slot(tbl, slot))
551 nfs4_free_slot(tbl, slot);
552 spin_unlock(&tbl->slot_tbl_lock);
553
554 res->sr_slot = NULL;
555out:
556 return 1;
557}
558
559#if defined(CONFIG_NFS_V4_1)
560
561static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
562{
563 struct nfs4_session *session;
564 struct nfs4_slot_table *tbl;
565 struct nfs4_slot *slot = res->sr_slot;
566 bool send_new_highest_used_slotid = false;
567
568 tbl = slot->table;
569 session = tbl->session;
570
571 spin_lock(&tbl->slot_tbl_lock);
572 /* Be nice to the server: try to ensure that the last transmitted
573 * value for highest_user_slotid <= target_highest_slotid
574 */
575 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
576 send_new_highest_used_slotid = true;
577
578 if (nfs41_wake_and_assign_slot(tbl, slot)) {
579 send_new_highest_used_slotid = false;
580 goto out_unlock;
581 }
582 nfs4_free_slot(tbl, slot);
583
584 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
585 send_new_highest_used_slotid = false;
586out_unlock:
587 spin_unlock(&tbl->slot_tbl_lock);
588 res->sr_slot = NULL;
589 if (send_new_highest_used_slotid)
590 nfs41_server_notify_highest_slotid_update(session->clp);
591}
592
593int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
594{
595 struct nfs4_session *session;
596 struct nfs4_slot *slot = res->sr_slot;
597 struct nfs_client *clp;
598 bool interrupted = false;
599 int ret = 1;
600
601 if (slot == NULL)
602 goto out_noaction;
603 /* don't increment the sequence number if the task wasn't sent */
604 if (!RPC_WAS_SENT(task))
605 goto out;
606
607 session = slot->table->session;
608
609 if (slot->interrupted) {
610 slot->interrupted = 0;
611 interrupted = true;
612 }
613
614 trace_nfs4_sequence_done(session, res);
615 /* Check the SEQUENCE operation status */
616 switch (res->sr_status) {
617 case 0:
618 /* Update the slot's sequence and clientid lease timer */
619 ++slot->seq_nr;
620 clp = session->clp;
621 do_renew_lease(clp, res->sr_timestamp);
622 /* Check sequence flags */
623 if (res->sr_status_flags != 0)
624 nfs4_schedule_lease_recovery(clp);
625 nfs41_update_target_slotid(slot->table, slot, res);
626 break;
627 case 1:
628 /*
629 * sr_status remains 1 if an RPC level error occurred.
630 * The server may or may not have processed the sequence
631 * operation..
632 * Mark the slot as having hosted an interrupted RPC call.
633 */
634 slot->interrupted = 1;
635 goto out;
636 case -NFS4ERR_DELAY:
637 /* The server detected a resend of the RPC call and
638 * returned NFS4ERR_DELAY as per Section 2.10.6.2
639 * of RFC5661.
640 */
641 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
642 __func__,
643 slot->slot_nr,
644 slot->seq_nr);
645 goto out_retry;
646 case -NFS4ERR_BADSLOT:
647 /*
648 * The slot id we used was probably retired. Try again
649 * using a different slot id.
650 */
651 goto retry_nowait;
652 case -NFS4ERR_SEQ_MISORDERED:
653 /*
654 * Was the last operation on this sequence interrupted?
655 * If so, retry after bumping the sequence number.
656 */
657 if (interrupted) {
658 ++slot->seq_nr;
659 goto retry_nowait;
660 }
661 /*
662 * Could this slot have been previously retired?
663 * If so, then the server may be expecting seq_nr = 1!
664 */
665 if (slot->seq_nr != 1) {
666 slot->seq_nr = 1;
667 goto retry_nowait;
668 }
669 break;
670 case -NFS4ERR_SEQ_FALSE_RETRY:
671 ++slot->seq_nr;
672 goto retry_nowait;
673 default:
674 /* Just update the slot sequence no. */
675 ++slot->seq_nr;
676 }
677out:
678 /* The session may be reset by one of the error handlers. */
679 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
680 nfs41_sequence_free_slot(res);
681out_noaction:
682 return ret;
683retry_nowait:
684 if (rpc_restart_call_prepare(task)) {
685 task->tk_status = 0;
686 ret = 0;
687 }
688 goto out;
689out_retry:
690 if (!rpc_restart_call(task))
691 goto out;
692 rpc_delay(task, NFS4_POLL_RETRY_MAX);
693 return 0;
694}
695EXPORT_SYMBOL_GPL(nfs41_sequence_done);
696
697static int nfs4_sequence_done(struct rpc_task *task,
698 struct nfs4_sequence_res *res)
699{
700 if (res->sr_slot == NULL)
701 return 1;
702 if (!res->sr_slot->table->session)
703 return nfs40_sequence_done(task, res);
704 return nfs41_sequence_done(task, res);
705}
706
707int nfs41_setup_sequence(struct nfs4_session *session,
708 struct nfs4_sequence_args *args,
709 struct nfs4_sequence_res *res,
710 struct rpc_task *task)
711{
712 struct nfs4_slot *slot;
713 struct nfs4_slot_table *tbl;
714
715 dprintk("--> %s\n", __func__);
716 /* slot already allocated? */
717 if (res->sr_slot != NULL)
718 goto out_success;
719
720 tbl = &session->fc_slot_table;
721
722 task->tk_timeout = 0;
723
724 spin_lock(&tbl->slot_tbl_lock);
725 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
726 !args->sa_privileged) {
727 /* The state manager will wait until the slot table is empty */
728 dprintk("%s session is draining\n", __func__);
729 goto out_sleep;
730 }
731
732 slot = nfs4_alloc_slot(tbl);
733 if (IS_ERR(slot)) {
734 /* If out of memory, try again in 1/4 second */
735 if (slot == ERR_PTR(-ENOMEM))
736 task->tk_timeout = HZ >> 2;
737 dprintk("<-- %s: no free slots\n", __func__);
738 goto out_sleep;
739 }
740 spin_unlock(&tbl->slot_tbl_lock);
741
742 args->sa_slot = slot;
743
744 dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
745 slot->slot_nr, slot->seq_nr);
746
747 res->sr_slot = slot;
748 res->sr_timestamp = jiffies;
749 res->sr_status_flags = 0;
750 /*
751 * sr_status is only set in decode_sequence, and so will remain
752 * set to 1 if an rpc level failure occurs.
753 */
754 res->sr_status = 1;
755 trace_nfs4_setup_sequence(session, args);
756out_success:
757 rpc_call_start(task);
758 return 0;
759out_sleep:
760 /* Privileged tasks are queued with top priority */
761 if (args->sa_privileged)
762 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
763 NULL, RPC_PRIORITY_PRIVILEGED);
764 else
765 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
766 spin_unlock(&tbl->slot_tbl_lock);
767 return -EAGAIN;
768}
769EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
770
771static int nfs4_setup_sequence(const struct nfs_server *server,
772 struct nfs4_sequence_args *args,
773 struct nfs4_sequence_res *res,
774 struct rpc_task *task)
775{
776 struct nfs4_session *session = nfs4_get_session(server);
777 int ret = 0;
778
779 if (!session)
780 return nfs40_setup_sequence(server, args, res, task);
781
782 dprintk("--> %s clp %p session %p sr_slot %u\n",
783 __func__, session->clp, session, res->sr_slot ?
784 res->sr_slot->slot_nr : NFS4_NO_SLOT);
785
786 ret = nfs41_setup_sequence(session, args, res, task);
787
788 dprintk("<-- %s status=%d\n", __func__, ret);
789 return ret;
790}
791
792static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
793{
794 struct nfs4_call_sync_data *data = calldata;
795 struct nfs4_session *session = nfs4_get_session(data->seq_server);
796
797 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
798
799 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
800}
801
802static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
803{
804 struct nfs4_call_sync_data *data = calldata;
805
806 nfs41_sequence_done(task, data->seq_res);
807}
808
809static const struct rpc_call_ops nfs41_call_sync_ops = {
810 .rpc_call_prepare = nfs41_call_sync_prepare,
811 .rpc_call_done = nfs41_call_sync_done,
812};
813
814#else /* !CONFIG_NFS_V4_1 */
815
816static int nfs4_setup_sequence(const struct nfs_server *server,
817 struct nfs4_sequence_args *args,
818 struct nfs4_sequence_res *res,
819 struct rpc_task *task)
820{
821 return nfs40_setup_sequence(server, args, res, task);
822}
823
824static int nfs4_sequence_done(struct rpc_task *task,
825 struct nfs4_sequence_res *res)
826{
827 return nfs40_sequence_done(task, res);
828}
829
830#endif /* !CONFIG_NFS_V4_1 */
831
832static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
833{
834 struct nfs4_call_sync_data *data = calldata;
835 nfs4_setup_sequence(data->seq_server,
836 data->seq_args, data->seq_res, task);
837}
838
839static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
840{
841 struct nfs4_call_sync_data *data = calldata;
842 nfs4_sequence_done(task, data->seq_res);
843}
844
845static const struct rpc_call_ops nfs40_call_sync_ops = {
846 .rpc_call_prepare = nfs40_call_sync_prepare,
847 .rpc_call_done = nfs40_call_sync_done,
848};
849
850static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
851 struct nfs_server *server,
852 struct rpc_message *msg,
853 struct nfs4_sequence_args *args,
854 struct nfs4_sequence_res *res)
855{
856 int ret;
857 struct rpc_task *task;
858 struct nfs_client *clp = server->nfs_client;
859 struct nfs4_call_sync_data data = {
860 .seq_server = server,
861 .seq_args = args,
862 .seq_res = res,
863 };
864 struct rpc_task_setup task_setup = {
865 .rpc_client = clnt,
866 .rpc_message = msg,
867 .callback_ops = clp->cl_mvops->call_sync_ops,
868 .callback_data = &data
869 };
870
871 task = rpc_run_task(&task_setup);
872 if (IS_ERR(task))
873 ret = PTR_ERR(task);
874 else {
875 ret = task->tk_status;
876 rpc_put_task(task);
877 }
878 return ret;
879}
880
881int nfs4_call_sync(struct rpc_clnt *clnt,
882 struct nfs_server *server,
883 struct rpc_message *msg,
884 struct nfs4_sequence_args *args,
885 struct nfs4_sequence_res *res,
886 int cache_reply)
887{
888 nfs4_init_sequence(args, res, cache_reply);
889 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
890}
891
892static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
893{
894 struct nfs_inode *nfsi = NFS_I(dir);
895
896 spin_lock(&dir->i_lock);
897 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
898 if (!cinfo->atomic || cinfo->before != dir->i_version)
899 nfs_force_lookup_revalidate(dir);
900 dir->i_version = cinfo->after;
901 nfs_fscache_invalidate(dir);
902 spin_unlock(&dir->i_lock);
903}
904
905struct nfs4_opendata {
906 struct kref kref;
907 struct nfs_openargs o_arg;
908 struct nfs_openres o_res;
909 struct nfs_open_confirmargs c_arg;
910 struct nfs_open_confirmres c_res;
911 struct nfs4_string owner_name;
912 struct nfs4_string group_name;
913 struct nfs_fattr f_attr;
914 struct nfs4_label *f_label;
915 struct dentry *dir;
916 struct dentry *dentry;
917 struct nfs4_state_owner *owner;
918 struct nfs4_state *state;
919 struct iattr attrs;
920 unsigned long timestamp;
921 unsigned int rpc_done : 1;
922 unsigned int file_created : 1;
923 unsigned int is_recover : 1;
924 int rpc_status;
925 int cancelled;
926};
927
928static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
929 int err, struct nfs4_exception *exception)
930{
931 if (err != -EINVAL)
932 return false;
933 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
934 return false;
935 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
936 exception->retry = 1;
937 return true;
938}
939
940static enum open_claim_type4
941nfs4_map_atomic_open_claim(struct nfs_server *server,
942 enum open_claim_type4 claim)
943{
944 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
945 return claim;
946 switch (claim) {
947 default:
948 return claim;
949 case NFS4_OPEN_CLAIM_FH:
950 return NFS4_OPEN_CLAIM_NULL;
951 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
952 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
953 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
954 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
955 }
956}
957
958static void nfs4_init_opendata_res(struct nfs4_opendata *p)
959{
960 p->o_res.f_attr = &p->f_attr;
961 p->o_res.f_label = p->f_label;
962 p->o_res.seqid = p->o_arg.seqid;
963 p->c_res.seqid = p->c_arg.seqid;
964 p->o_res.server = p->o_arg.server;
965 p->o_res.access_request = p->o_arg.access;
966 nfs_fattr_init(&p->f_attr);
967 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
968}
969
970static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
971 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
972 const struct iattr *attrs,
973 struct nfs4_label *label,
974 enum open_claim_type4 claim,
975 gfp_t gfp_mask)
976{
977 struct dentry *parent = dget_parent(dentry);
978 struct inode *dir = parent->d_inode;
979 struct nfs_server *server = NFS_SERVER(dir);
980 struct nfs4_opendata *p;
981
982 p = kzalloc(sizeof(*p), gfp_mask);
983 if (p == NULL)
984 goto err;
985
986 p->f_label = nfs4_label_alloc(server, gfp_mask);
987 if (IS_ERR(p->f_label))
988 goto err_free_p;
989
990 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
991 if (p->o_arg.seqid == NULL)
992 goto err_free_label;
993 nfs_sb_active(dentry->d_sb);
994 p->dentry = dget(dentry);
995 p->dir = parent;
996 p->owner = sp;
997 atomic_inc(&sp->so_count);
998 p->o_arg.open_flags = flags;
999 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1000 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1001 * will return permission denied for all bits until close */
1002 if (!(flags & O_EXCL)) {
1003 /* ask server to check for all possible rights as results
1004 * are cached */
1005 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1006 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1007 }
1008 p->o_arg.clientid = server->nfs_client->cl_clientid;
1009 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1010 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1011 p->o_arg.name = &dentry->d_name;
1012 p->o_arg.server = server;
1013 p->o_arg.bitmask = nfs4_bitmask(server, label);
1014 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1015 p->o_arg.label = label;
1016 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1017 switch (p->o_arg.claim) {
1018 case NFS4_OPEN_CLAIM_NULL:
1019 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1020 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1021 p->o_arg.fh = NFS_FH(dir);
1022 break;
1023 case NFS4_OPEN_CLAIM_PREVIOUS:
1024 case NFS4_OPEN_CLAIM_FH:
1025 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1026 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1027 p->o_arg.fh = NFS_FH(dentry->d_inode);
1028 }
1029 if (attrs != NULL && attrs->ia_valid != 0) {
1030 __u32 verf[2];
1031
1032 p->o_arg.u.attrs = &p->attrs;
1033 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1034
1035 verf[0] = jiffies;
1036 verf[1] = current->pid;
1037 memcpy(p->o_arg.u.verifier.data, verf,
1038 sizeof(p->o_arg.u.verifier.data));
1039 }
1040 p->c_arg.fh = &p->o_res.fh;
1041 p->c_arg.stateid = &p->o_res.stateid;
1042 p->c_arg.seqid = p->o_arg.seqid;
1043 nfs4_init_opendata_res(p);
1044 kref_init(&p->kref);
1045 return p;
1046
1047err_free_label:
1048 nfs4_label_free(p->f_label);
1049err_free_p:
1050 kfree(p);
1051err:
1052 dput(parent);
1053 return NULL;
1054}
1055
1056static void nfs4_opendata_free(struct kref *kref)
1057{
1058 struct nfs4_opendata *p = container_of(kref,
1059 struct nfs4_opendata, kref);
1060 struct super_block *sb = p->dentry->d_sb;
1061
1062 nfs_free_seqid(p->o_arg.seqid);
1063 if (p->state != NULL)
1064 nfs4_put_open_state(p->state);
1065 nfs4_put_state_owner(p->owner);
1066
1067 nfs4_label_free(p->f_label);
1068
1069 dput(p->dir);
1070 dput(p->dentry);
1071 nfs_sb_deactive(sb);
1072 nfs_fattr_free_names(&p->f_attr);
1073 kfree(p->f_attr.mdsthreshold);
1074 kfree(p);
1075}
1076
1077static void nfs4_opendata_put(struct nfs4_opendata *p)
1078{
1079 if (p != NULL)
1080 kref_put(&p->kref, nfs4_opendata_free);
1081}
1082
1083static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1084{
1085 int ret;
1086
1087 ret = rpc_wait_for_completion_task(task);
1088 return ret;
1089}
1090
1091static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1092{
1093 int ret = 0;
1094
1095 if (open_mode & (O_EXCL|O_TRUNC))
1096 goto out;
1097 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1098 case FMODE_READ:
1099 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1100 && state->n_rdonly != 0;
1101 break;
1102 case FMODE_WRITE:
1103 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1104 && state->n_wronly != 0;
1105 break;
1106 case FMODE_READ|FMODE_WRITE:
1107 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1108 && state->n_rdwr != 0;
1109 }
1110out:
1111 return ret;
1112}
1113
1114static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1115{
1116 if (delegation == NULL)
1117 return 0;
1118 if ((delegation->type & fmode) != fmode)
1119 return 0;
1120 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1121 return 0;
1122 nfs_mark_delegation_referenced(delegation);
1123 return 1;
1124}
1125
1126static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1127{
1128 switch (fmode) {
1129 case FMODE_WRITE:
1130 state->n_wronly++;
1131 break;
1132 case FMODE_READ:
1133 state->n_rdonly++;
1134 break;
1135 case FMODE_READ|FMODE_WRITE:
1136 state->n_rdwr++;
1137 }
1138 nfs4_state_set_mode_locked(state, state->state | fmode);
1139}
1140
1141static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1142{
1143 struct nfs_client *clp = state->owner->so_server->nfs_client;
1144 bool need_recover = false;
1145
1146 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1147 need_recover = true;
1148 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1149 need_recover = true;
1150 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1151 need_recover = true;
1152 if (need_recover)
1153 nfs4_state_mark_reclaim_nograce(clp, state);
1154}
1155
1156static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1157 nfs4_stateid *stateid)
1158{
1159 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1160 return true;
1161 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1162 nfs_test_and_clear_all_open_stateid(state);
1163 return true;
1164 }
1165 if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1166 return true;
1167 return false;
1168}
1169
1170static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1171 nfs4_stateid *stateid, fmode_t fmode)
1172{
1173 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1174 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1175 case FMODE_WRITE:
1176 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1177 break;
1178 case FMODE_READ:
1179 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1180 break;
1181 case 0:
1182 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1183 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1184 clear_bit(NFS_OPEN_STATE, &state->flags);
1185 }
1186 if (stateid == NULL)
1187 return;
1188 if (!nfs_need_update_open_stateid(state, stateid))
1189 return;
1190 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1191 nfs4_stateid_copy(&state->stateid, stateid);
1192 nfs4_stateid_copy(&state->open_stateid, stateid);
1193}
1194
1195static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1196{
1197 write_seqlock(&state->seqlock);
1198 nfs_clear_open_stateid_locked(state, stateid, fmode);
1199 write_sequnlock(&state->seqlock);
1200 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1201 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1202}
1203
1204static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1205{
1206 switch (fmode) {
1207 case FMODE_READ:
1208 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1209 break;
1210 case FMODE_WRITE:
1211 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1212 break;
1213 case FMODE_READ|FMODE_WRITE:
1214 set_bit(NFS_O_RDWR_STATE, &state->flags);
1215 }
1216 if (!nfs_need_update_open_stateid(state, stateid))
1217 return;
1218 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1219 nfs4_stateid_copy(&state->stateid, stateid);
1220 nfs4_stateid_copy(&state->open_stateid, stateid);
1221}
1222
1223static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1224{
1225 /*
1226 * Protect the call to nfs4_state_set_mode_locked and
1227 * serialise the stateid update
1228 */
1229 write_seqlock(&state->seqlock);
1230 if (deleg_stateid != NULL) {
1231 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1232 set_bit(NFS_DELEGATED_STATE, &state->flags);
1233 }
1234 if (open_stateid != NULL)
1235 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1236 write_sequnlock(&state->seqlock);
1237 spin_lock(&state->owner->so_lock);
1238 update_open_stateflags(state, fmode);
1239 spin_unlock(&state->owner->so_lock);
1240}
1241
1242static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1243{
1244 struct nfs_inode *nfsi = NFS_I(state->inode);
1245 struct nfs_delegation *deleg_cur;
1246 int ret = 0;
1247
1248 fmode &= (FMODE_READ|FMODE_WRITE);
1249
1250 rcu_read_lock();
1251 deleg_cur = rcu_dereference(nfsi->delegation);
1252 if (deleg_cur == NULL)
1253 goto no_delegation;
1254
1255 spin_lock(&deleg_cur->lock);
1256 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1257 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1258 (deleg_cur->type & fmode) != fmode)
1259 goto no_delegation_unlock;
1260
1261 if (delegation == NULL)
1262 delegation = &deleg_cur->stateid;
1263 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1264 goto no_delegation_unlock;
1265
1266 nfs_mark_delegation_referenced(deleg_cur);
1267 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1268 ret = 1;
1269no_delegation_unlock:
1270 spin_unlock(&deleg_cur->lock);
1271no_delegation:
1272 rcu_read_unlock();
1273
1274 if (!ret && open_stateid != NULL) {
1275 __update_open_stateid(state, open_stateid, NULL, fmode);
1276 ret = 1;
1277 }
1278 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1279 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1280
1281 return ret;
1282}
1283
1284
1285static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1286{
1287 struct nfs_delegation *delegation;
1288
1289 rcu_read_lock();
1290 delegation = rcu_dereference(NFS_I(inode)->delegation);
1291 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1292 rcu_read_unlock();
1293 return;
1294 }
1295 rcu_read_unlock();
1296 nfs4_inode_return_delegation(inode);
1297}
1298
1299static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1300{
1301 struct nfs4_state *state = opendata->state;
1302 struct nfs_inode *nfsi = NFS_I(state->inode);
1303 struct nfs_delegation *delegation;
1304 int open_mode = opendata->o_arg.open_flags;
1305 fmode_t fmode = opendata->o_arg.fmode;
1306 nfs4_stateid stateid;
1307 int ret = -EAGAIN;
1308
1309 for (;;) {
1310 spin_lock(&state->owner->so_lock);
1311 if (can_open_cached(state, fmode, open_mode)) {
1312 update_open_stateflags(state, fmode);
1313 spin_unlock(&state->owner->so_lock);
1314 goto out_return_state;
1315 }
1316 spin_unlock(&state->owner->so_lock);
1317 rcu_read_lock();
1318 delegation = rcu_dereference(nfsi->delegation);
1319 if (!can_open_delegated(delegation, fmode)) {
1320 rcu_read_unlock();
1321 break;
1322 }
1323 /* Save the delegation */
1324 nfs4_stateid_copy(&stateid, &delegation->stateid);
1325 rcu_read_unlock();
1326 nfs_release_seqid(opendata->o_arg.seqid);
1327 if (!opendata->is_recover) {
1328 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1329 if (ret != 0)
1330 goto out;
1331 }
1332 ret = -EAGAIN;
1333
1334 /* Try to update the stateid using the delegation */
1335 if (update_open_stateid(state, NULL, &stateid, fmode))
1336 goto out_return_state;
1337 }
1338out:
1339 return ERR_PTR(ret);
1340out_return_state:
1341 atomic_inc(&state->count);
1342 return state;
1343}
1344
1345static void
1346nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1347{
1348 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1349 struct nfs_delegation *delegation;
1350 int delegation_flags = 0;
1351
1352 rcu_read_lock();
1353 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1354 if (delegation)
1355 delegation_flags = delegation->flags;
1356 rcu_read_unlock();
1357 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1358 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1359 "returning a delegation for "
1360 "OPEN(CLAIM_DELEGATE_CUR)\n",
1361 clp->cl_hostname);
1362 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1363 nfs_inode_set_delegation(state->inode,
1364 data->owner->so_cred,
1365 &data->o_res);
1366 else
1367 nfs_inode_reclaim_delegation(state->inode,
1368 data->owner->so_cred,
1369 &data->o_res);
1370}
1371
1372/*
1373 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1374 * and update the nfs4_state.
1375 */
1376static struct nfs4_state *
1377_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1378{
1379 struct inode *inode = data->state->inode;
1380 struct nfs4_state *state = data->state;
1381 int ret;
1382
1383 if (!data->rpc_done) {
1384 if (data->rpc_status) {
1385 ret = data->rpc_status;
1386 goto err;
1387 }
1388 /* cached opens have already been processed */
1389 goto update;
1390 }
1391
1392 ret = nfs_refresh_inode(inode, &data->f_attr);
1393 if (ret)
1394 goto err;
1395
1396 if (data->o_res.delegation_type != 0)
1397 nfs4_opendata_check_deleg(data, state);
1398update:
1399 update_open_stateid(state, &data->o_res.stateid, NULL,
1400 data->o_arg.fmode);
1401 atomic_inc(&state->count);
1402
1403 return state;
1404err:
1405 return ERR_PTR(ret);
1406
1407}
1408
1409static struct nfs4_state *
1410_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1411{
1412 struct inode *inode;
1413 struct nfs4_state *state = NULL;
1414 int ret;
1415
1416 if (!data->rpc_done) {
1417 state = nfs4_try_open_cached(data);
1418 goto out;
1419 }
1420
1421 ret = -EAGAIN;
1422 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1423 goto err;
1424 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1425 ret = PTR_ERR(inode);
1426 if (IS_ERR(inode))
1427 goto err;
1428 ret = -ENOMEM;
1429 state = nfs4_get_open_state(inode, data->owner);
1430 if (state == NULL)
1431 goto err_put_inode;
1432 if (data->o_res.delegation_type != 0)
1433 nfs4_opendata_check_deleg(data, state);
1434 update_open_stateid(state, &data->o_res.stateid, NULL,
1435 data->o_arg.fmode);
1436 iput(inode);
1437out:
1438 nfs_release_seqid(data->o_arg.seqid);
1439 return state;
1440err_put_inode:
1441 iput(inode);
1442err:
1443 return ERR_PTR(ret);
1444}
1445
1446static struct nfs4_state *
1447nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1448{
1449 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1450 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1451 return _nfs4_opendata_to_nfs4_state(data);
1452}
1453
1454static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1455{
1456 struct nfs_inode *nfsi = NFS_I(state->inode);
1457 struct nfs_open_context *ctx;
1458
1459 spin_lock(&state->inode->i_lock);
1460 list_for_each_entry(ctx, &nfsi->open_files, list) {
1461 if (ctx->state != state)
1462 continue;
1463 get_nfs_open_context(ctx);
1464 spin_unlock(&state->inode->i_lock);
1465 return ctx;
1466 }
1467 spin_unlock(&state->inode->i_lock);
1468 return ERR_PTR(-ENOENT);
1469}
1470
1471static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1472 struct nfs4_state *state, enum open_claim_type4 claim)
1473{
1474 struct nfs4_opendata *opendata;
1475
1476 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1477 NULL, NULL, claim, GFP_NOFS);
1478 if (opendata == NULL)
1479 return ERR_PTR(-ENOMEM);
1480 opendata->state = state;
1481 atomic_inc(&state->count);
1482 return opendata;
1483}
1484
1485static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1486{
1487 struct nfs4_state *newstate;
1488 int ret;
1489
1490 opendata->o_arg.open_flags = 0;
1491 opendata->o_arg.fmode = fmode;
1492 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1493 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1494 nfs4_init_opendata_res(opendata);
1495 ret = _nfs4_recover_proc_open(opendata);
1496 if (ret != 0)
1497 return ret;
1498 newstate = nfs4_opendata_to_nfs4_state(opendata);
1499 if (IS_ERR(newstate))
1500 return PTR_ERR(newstate);
1501 nfs4_close_state(newstate, fmode);
1502 *res = newstate;
1503 return 0;
1504}
1505
1506static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1507{
1508 struct nfs4_state *newstate;
1509 int ret;
1510
1511 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1512 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1513 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1514 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1515 /* memory barrier prior to reading state->n_* */
1516 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1517 clear_bit(NFS_OPEN_STATE, &state->flags);
1518 smp_rmb();
1519 if (state->n_rdwr != 0) {
1520 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1521 if (ret != 0)
1522 return ret;
1523 if (newstate != state)
1524 return -ESTALE;
1525 }
1526 if (state->n_wronly != 0) {
1527 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1528 if (ret != 0)
1529 return ret;
1530 if (newstate != state)
1531 return -ESTALE;
1532 }
1533 if (state->n_rdonly != 0) {
1534 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1535 if (ret != 0)
1536 return ret;
1537 if (newstate != state)
1538 return -ESTALE;
1539 }
1540 /*
1541 * We may have performed cached opens for all three recoveries.
1542 * Check if we need to update the current stateid.
1543 */
1544 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1545 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1546 write_seqlock(&state->seqlock);
1547 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1548 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1549 write_sequnlock(&state->seqlock);
1550 }
1551 return 0;
1552}
1553
1554/*
1555 * OPEN_RECLAIM:
1556 * reclaim state on the server after a reboot.
1557 */
1558static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1559{
1560 struct nfs_delegation *delegation;
1561 struct nfs4_opendata *opendata;
1562 fmode_t delegation_type = 0;
1563 int status;
1564
1565 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1566 NFS4_OPEN_CLAIM_PREVIOUS);
1567 if (IS_ERR(opendata))
1568 return PTR_ERR(opendata);
1569 rcu_read_lock();
1570 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1571 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1572 delegation_type = delegation->type;
1573 rcu_read_unlock();
1574 opendata->o_arg.u.delegation_type = delegation_type;
1575 status = nfs4_open_recover(opendata, state);
1576 nfs4_opendata_put(opendata);
1577 return status;
1578}
1579
1580static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1581{
1582 struct nfs_server *server = NFS_SERVER(state->inode);
1583 struct nfs4_exception exception = { };
1584 int err;
1585 do {
1586 err = _nfs4_do_open_reclaim(ctx, state);
1587 trace_nfs4_open_reclaim(ctx, 0, err);
1588 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1589 continue;
1590 if (err != -NFS4ERR_DELAY)
1591 break;
1592 nfs4_handle_exception(server, err, &exception);
1593 } while (exception.retry);
1594 return err;
1595}
1596
1597static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1598{
1599 struct nfs_open_context *ctx;
1600 int ret;
1601
1602 ctx = nfs4_state_find_open_context(state);
1603 if (IS_ERR(ctx))
1604 return -EAGAIN;
1605 ret = nfs4_do_open_reclaim(ctx, state);
1606 put_nfs_open_context(ctx);
1607 return ret;
1608}
1609
1610static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1611{
1612 switch (err) {
1613 default:
1614 printk(KERN_ERR "NFS: %s: unhandled error "
1615 "%d.\n", __func__, err);
1616 case 0:
1617 case -ENOENT:
1618 case -ESTALE:
1619 break;
1620 case -NFS4ERR_BADSESSION:
1621 case -NFS4ERR_BADSLOT:
1622 case -NFS4ERR_BAD_HIGH_SLOT:
1623 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1624 case -NFS4ERR_DEADSESSION:
1625 set_bit(NFS_DELEGATED_STATE, &state->flags);
1626 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1627 return -EAGAIN;
1628 case -NFS4ERR_STALE_CLIENTID:
1629 case -NFS4ERR_STALE_STATEID:
1630 set_bit(NFS_DELEGATED_STATE, &state->flags);
1631 case -NFS4ERR_EXPIRED:
1632 /* Don't recall a delegation if it was lost */
1633 nfs4_schedule_lease_recovery(server->nfs_client);
1634 return -EAGAIN;
1635 case -NFS4ERR_MOVED:
1636 nfs4_schedule_migration_recovery(server);
1637 return -EAGAIN;
1638 case -NFS4ERR_LEASE_MOVED:
1639 nfs4_schedule_lease_moved_recovery(server->nfs_client);
1640 return -EAGAIN;
1641 case -NFS4ERR_DELEG_REVOKED:
1642 case -NFS4ERR_ADMIN_REVOKED:
1643 case -NFS4ERR_BAD_STATEID:
1644 case -NFS4ERR_OPENMODE:
1645 nfs_inode_find_state_and_recover(state->inode,
1646 stateid);
1647 nfs4_schedule_stateid_recovery(server, state);
1648 return -EAGAIN;
1649 case -NFS4ERR_DELAY:
1650 case -NFS4ERR_GRACE:
1651 set_bit(NFS_DELEGATED_STATE, &state->flags);
1652 ssleep(1);
1653 return -EAGAIN;
1654 case -ENOMEM:
1655 case -NFS4ERR_DENIED:
1656 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1657 return 0;
1658 }
1659 return err;
1660}
1661
1662int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1663{
1664 struct nfs_server *server = NFS_SERVER(state->inode);
1665 struct nfs4_opendata *opendata;
1666 int err;
1667
1668 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1669 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1670 if (IS_ERR(opendata))
1671 return PTR_ERR(opendata);
1672 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1673 err = nfs4_open_recover(opendata, state);
1674 nfs4_opendata_put(opendata);
1675 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1676}
1677
1678static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1679{
1680 struct nfs4_opendata *data = calldata;
1681
1682 nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1683 &data->c_res.seq_res, task);
1684}
1685
1686static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1687{
1688 struct nfs4_opendata *data = calldata;
1689
1690 nfs40_sequence_done(task, &data->c_res.seq_res);
1691
1692 data->rpc_status = task->tk_status;
1693 if (data->rpc_status == 0) {
1694 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1695 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1696 renew_lease(data->o_res.server, data->timestamp);
1697 data->rpc_done = 1;
1698 }
1699}
1700
1701static void nfs4_open_confirm_release(void *calldata)
1702{
1703 struct nfs4_opendata *data = calldata;
1704 struct nfs4_state *state = NULL;
1705
1706 /* If this request hasn't been cancelled, do nothing */
1707 if (data->cancelled == 0)
1708 goto out_free;
1709 /* In case of error, no cleanup! */
1710 if (!data->rpc_done)
1711 goto out_free;
1712 state = nfs4_opendata_to_nfs4_state(data);
1713 if (!IS_ERR(state))
1714 nfs4_close_state(state, data->o_arg.fmode);
1715out_free:
1716 nfs4_opendata_put(data);
1717}
1718
1719static const struct rpc_call_ops nfs4_open_confirm_ops = {
1720 .rpc_call_prepare = nfs4_open_confirm_prepare,
1721 .rpc_call_done = nfs4_open_confirm_done,
1722 .rpc_release = nfs4_open_confirm_release,
1723};
1724
1725/*
1726 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1727 */
1728static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1729{
1730 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1731 struct rpc_task *task;
1732 struct rpc_message msg = {
1733 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1734 .rpc_argp = &data->c_arg,
1735 .rpc_resp = &data->c_res,
1736 .rpc_cred = data->owner->so_cred,
1737 };
1738 struct rpc_task_setup task_setup_data = {
1739 .rpc_client = server->client,
1740 .rpc_message = &msg,
1741 .callback_ops = &nfs4_open_confirm_ops,
1742 .callback_data = data,
1743 .workqueue = nfsiod_workqueue,
1744 .flags = RPC_TASK_ASYNC,
1745 };
1746 int status;
1747
1748 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1749 kref_get(&data->kref);
1750 data->rpc_done = 0;
1751 data->rpc_status = 0;
1752 data->timestamp = jiffies;
1753 task = rpc_run_task(&task_setup_data);
1754 if (IS_ERR(task))
1755 return PTR_ERR(task);
1756 status = nfs4_wait_for_completion_rpc_task(task);
1757 if (status != 0) {
1758 data->cancelled = 1;
1759 smp_wmb();
1760 } else
1761 status = data->rpc_status;
1762 rpc_put_task(task);
1763 return status;
1764}
1765
1766static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1767{
1768 struct nfs4_opendata *data = calldata;
1769 struct nfs4_state_owner *sp = data->owner;
1770 struct nfs_client *clp = sp->so_server->nfs_client;
1771
1772 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1773 goto out_wait;
1774 /*
1775 * Check if we still need to send an OPEN call, or if we can use
1776 * a delegation instead.
1777 */
1778 if (data->state != NULL) {
1779 struct nfs_delegation *delegation;
1780
1781 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1782 goto out_no_action;
1783 rcu_read_lock();
1784 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1785 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1786 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1787 can_open_delegated(delegation, data->o_arg.fmode))
1788 goto unlock_no_action;
1789 rcu_read_unlock();
1790 }
1791 /* Update client id. */
1792 data->o_arg.clientid = clp->cl_clientid;
1793 switch (data->o_arg.claim) {
1794 case NFS4_OPEN_CLAIM_PREVIOUS:
1795 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1796 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1797 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1798 case NFS4_OPEN_CLAIM_FH:
1799 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1800 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1801 }
1802 data->timestamp = jiffies;
1803 if (nfs4_setup_sequence(data->o_arg.server,
1804 &data->o_arg.seq_args,
1805 &data->o_res.seq_res,
1806 task) != 0)
1807 nfs_release_seqid(data->o_arg.seqid);
1808
1809 /* Set the create mode (note dependency on the session type) */
1810 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1811 if (data->o_arg.open_flags & O_EXCL) {
1812 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1813 if (nfs4_has_persistent_session(clp))
1814 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1815 else if (clp->cl_mvops->minor_version > 0)
1816 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1817 }
1818 return;
1819unlock_no_action:
1820 rcu_read_unlock();
1821out_no_action:
1822 task->tk_action = NULL;
1823out_wait:
1824 nfs4_sequence_done(task, &data->o_res.seq_res);
1825}
1826
1827static void nfs4_open_done(struct rpc_task *task, void *calldata)
1828{
1829 struct nfs4_opendata *data = calldata;
1830
1831 data->rpc_status = task->tk_status;
1832
1833 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1834 return;
1835
1836 if (task->tk_status == 0) {
1837 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1838 switch (data->o_res.f_attr->mode & S_IFMT) {
1839 case S_IFREG:
1840 break;
1841 case S_IFLNK:
1842 data->rpc_status = -ELOOP;
1843 break;
1844 case S_IFDIR:
1845 data->rpc_status = -EISDIR;
1846 break;
1847 default:
1848 data->rpc_status = -ENOTDIR;
1849 }
1850 }
1851 renew_lease(data->o_res.server, data->timestamp);
1852 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1853 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1854 }
1855 data->rpc_done = 1;
1856}
1857
1858static void nfs4_open_release(void *calldata)
1859{
1860 struct nfs4_opendata *data = calldata;
1861 struct nfs4_state *state = NULL;
1862
1863 /* If this request hasn't been cancelled, do nothing */
1864 if (data->cancelled == 0)
1865 goto out_free;
1866 /* In case of error, no cleanup! */
1867 if (data->rpc_status != 0 || !data->rpc_done)
1868 goto out_free;
1869 /* In case we need an open_confirm, no cleanup! */
1870 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1871 goto out_free;
1872 state = nfs4_opendata_to_nfs4_state(data);
1873 if (!IS_ERR(state))
1874 nfs4_close_state(state, data->o_arg.fmode);
1875out_free:
1876 nfs4_opendata_put(data);
1877}
1878
1879static const struct rpc_call_ops nfs4_open_ops = {
1880 .rpc_call_prepare = nfs4_open_prepare,
1881 .rpc_call_done = nfs4_open_done,
1882 .rpc_release = nfs4_open_release,
1883};
1884
1885static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1886{
1887 struct inode *dir = data->dir->d_inode;
1888 struct nfs_server *server = NFS_SERVER(dir);
1889 struct nfs_openargs *o_arg = &data->o_arg;
1890 struct nfs_openres *o_res = &data->o_res;
1891 struct rpc_task *task;
1892 struct rpc_message msg = {
1893 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1894 .rpc_argp = o_arg,
1895 .rpc_resp = o_res,
1896 .rpc_cred = data->owner->so_cred,
1897 };
1898 struct rpc_task_setup task_setup_data = {
1899 .rpc_client = server->client,
1900 .rpc_message = &msg,
1901 .callback_ops = &nfs4_open_ops,
1902 .callback_data = data,
1903 .workqueue = nfsiod_workqueue,
1904 .flags = RPC_TASK_ASYNC,
1905 };
1906 int status;
1907
1908 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1909 kref_get(&data->kref);
1910 data->rpc_done = 0;
1911 data->rpc_status = 0;
1912 data->cancelled = 0;
1913 data->is_recover = 0;
1914 if (isrecover) {
1915 nfs4_set_sequence_privileged(&o_arg->seq_args);
1916 data->is_recover = 1;
1917 }
1918 task = rpc_run_task(&task_setup_data);
1919 if (IS_ERR(task))
1920 return PTR_ERR(task);
1921 status = nfs4_wait_for_completion_rpc_task(task);
1922 if (status != 0) {
1923 data->cancelled = 1;
1924 smp_wmb();
1925 } else
1926 status = data->rpc_status;
1927 rpc_put_task(task);
1928
1929 return status;
1930}
1931
1932static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1933{
1934 struct inode *dir = data->dir->d_inode;
1935 struct nfs_openres *o_res = &data->o_res;
1936 int status;
1937
1938 status = nfs4_run_open_task(data, 1);
1939 if (status != 0 || !data->rpc_done)
1940 return status;
1941
1942 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1943
1944 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1945 status = _nfs4_proc_open_confirm(data);
1946 if (status != 0)
1947 return status;
1948 }
1949
1950 return status;
1951}
1952
1953/*
1954 * Additional permission checks in order to distinguish between an
1955 * open for read, and an open for execute. This works around the
1956 * fact that NFSv4 OPEN treats read and execute permissions as being
1957 * the same.
1958 * Note that in the non-execute case, we want to turn off permission
1959 * checking if we just created a new file (POSIX open() semantics).
1960 */
1961static int nfs4_opendata_access(struct rpc_cred *cred,
1962 struct nfs4_opendata *opendata,
1963 struct nfs4_state *state, fmode_t fmode,
1964 int openflags)
1965{
1966 struct nfs_access_entry cache;
1967 u32 mask;
1968
1969 /* access call failed or for some reason the server doesn't
1970 * support any access modes -- defer access call until later */
1971 if (opendata->o_res.access_supported == 0)
1972 return 0;
1973
1974 mask = 0;
1975 /*
1976 * Use openflags to check for exec, because fmode won't
1977 * always have FMODE_EXEC set when file open for exec.
1978 */
1979 if (openflags & __FMODE_EXEC) {
1980 /* ONLY check for exec rights */
1981 mask = MAY_EXEC;
1982 } else if ((fmode & FMODE_READ) && !opendata->file_created)
1983 mask = MAY_READ;
1984
1985 cache.cred = cred;
1986 cache.jiffies = jiffies;
1987 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1988 nfs_access_add_cache(state->inode, &cache);
1989
1990 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1991 return 0;
1992
1993 /* even though OPEN succeeded, access is denied. Close the file */
1994 nfs4_close_state(state, fmode);
1995 return -EACCES;
1996}
1997
1998/*
1999 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2000 */
2001static int _nfs4_proc_open(struct nfs4_opendata *data)
2002{
2003 struct inode *dir = data->dir->d_inode;
2004 struct nfs_server *server = NFS_SERVER(dir);
2005 struct nfs_openargs *o_arg = &data->o_arg;
2006 struct nfs_openres *o_res = &data->o_res;
2007 int status;
2008
2009 status = nfs4_run_open_task(data, 0);
2010 if (!data->rpc_done)
2011 return status;
2012 if (status != 0) {
2013 if (status == -NFS4ERR_BADNAME &&
2014 !(o_arg->open_flags & O_CREAT))
2015 return -ENOENT;
2016 return status;
2017 }
2018
2019 nfs_fattr_map_and_free_names(server, &data->f_attr);
2020
2021 if (o_arg->open_flags & O_CREAT) {
2022 update_changeattr(dir, &o_res->cinfo);
2023 if (o_arg->open_flags & O_EXCL)
2024 data->file_created = 1;
2025 else if (o_res->cinfo.before != o_res->cinfo.after)
2026 data->file_created = 1;
2027 }
2028 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2029 server->caps &= ~NFS_CAP_POSIX_LOCK;
2030 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2031 status = _nfs4_proc_open_confirm(data);
2032 if (status != 0)
2033 return status;
2034 }
2035 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2036 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2037 return 0;
2038}
2039
2040static int nfs4_recover_expired_lease(struct nfs_server *server)
2041{
2042 return nfs4_client_recover_expired_lease(server->nfs_client);
2043}
2044
2045/*
2046 * OPEN_EXPIRED:
2047 * reclaim state on the server after a network partition.
2048 * Assumes caller holds the appropriate lock
2049 */
2050static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2051{
2052 struct nfs4_opendata *opendata;
2053 int ret;
2054
2055 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2056 NFS4_OPEN_CLAIM_FH);
2057 if (IS_ERR(opendata))
2058 return PTR_ERR(opendata);
2059 ret = nfs4_open_recover(opendata, state);
2060 if (ret == -ESTALE)
2061 d_drop(ctx->dentry);
2062 nfs4_opendata_put(opendata);
2063 return ret;
2064}
2065
2066static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2067{
2068 struct nfs_server *server = NFS_SERVER(state->inode);
2069 struct nfs4_exception exception = { };
2070 int err;
2071
2072 do {
2073 err = _nfs4_open_expired(ctx, state);
2074 trace_nfs4_open_expired(ctx, 0, err);
2075 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2076 continue;
2077 switch (err) {
2078 default:
2079 goto out;
2080 case -NFS4ERR_GRACE:
2081 case -NFS4ERR_DELAY:
2082 nfs4_handle_exception(server, err, &exception);
2083 err = 0;
2084 }
2085 } while (exception.retry);
2086out:
2087 return err;
2088}
2089
2090static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2091{
2092 struct nfs_open_context *ctx;
2093 int ret;
2094
2095 ctx = nfs4_state_find_open_context(state);
2096 if (IS_ERR(ctx))
2097 return -EAGAIN;
2098 ret = nfs4_do_open_expired(ctx, state);
2099 put_nfs_open_context(ctx);
2100 return ret;
2101}
2102
2103static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2104{
2105 nfs_remove_bad_delegation(state->inode);
2106 write_seqlock(&state->seqlock);
2107 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2108 write_sequnlock(&state->seqlock);
2109 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2110}
2111
2112static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2113{
2114 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2115 nfs_finish_clear_delegation_stateid(state);
2116}
2117
2118static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2119{
2120 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2121 nfs40_clear_delegation_stateid(state);
2122 return nfs4_open_expired(sp, state);
2123}
2124
2125#if defined(CONFIG_NFS_V4_1)
2126static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2127{
2128 struct nfs_server *server = NFS_SERVER(state->inode);
2129 nfs4_stateid stateid;
2130 struct nfs_delegation *delegation;
2131 struct rpc_cred *cred;
2132 int status;
2133
2134 /* Get the delegation credential for use by test/free_stateid */
2135 rcu_read_lock();
2136 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2137 if (delegation == NULL) {
2138 rcu_read_unlock();
2139 return;
2140 }
2141
2142 nfs4_stateid_copy(&stateid, &delegation->stateid);
2143 cred = get_rpccred(delegation->cred);
2144 rcu_read_unlock();
2145 status = nfs41_test_stateid(server, &stateid, cred);
2146 trace_nfs4_test_delegation_stateid(state, NULL, status);
2147
2148 if (status != NFS_OK) {
2149 /* Free the stateid unless the server explicitly
2150 * informs us the stateid is unrecognized. */
2151 if (status != -NFS4ERR_BAD_STATEID)
2152 nfs41_free_stateid(server, &stateid, cred);
2153 nfs_finish_clear_delegation_stateid(state);
2154 }
2155
2156 put_rpccred(cred);
2157}
2158
2159/**
2160 * nfs41_check_open_stateid - possibly free an open stateid
2161 *
2162 * @state: NFSv4 state for an inode
2163 *
2164 * Returns NFS_OK if recovery for this stateid is now finished.
2165 * Otherwise a negative NFS4ERR value is returned.
2166 */
2167static int nfs41_check_open_stateid(struct nfs4_state *state)
2168{
2169 struct nfs_server *server = NFS_SERVER(state->inode);
2170 nfs4_stateid *stateid = &state->open_stateid;
2171 struct rpc_cred *cred = state->owner->so_cred;
2172 int status;
2173
2174 /* If a state reset has been done, test_stateid is unneeded */
2175 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2176 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2177 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2178 return -NFS4ERR_BAD_STATEID;
2179
2180 status = nfs41_test_stateid(server, stateid, cred);
2181 trace_nfs4_test_open_stateid(state, NULL, status);
2182 if (status != NFS_OK) {
2183 /* Free the stateid unless the server explicitly
2184 * informs us the stateid is unrecognized. */
2185 if (status != -NFS4ERR_BAD_STATEID)
2186 nfs41_free_stateid(server, stateid, cred);
2187
2188 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2189 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2190 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2191 clear_bit(NFS_OPEN_STATE, &state->flags);
2192 }
2193 return status;
2194}
2195
2196static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2197{
2198 int status;
2199
2200 nfs41_check_delegation_stateid(state);
2201 status = nfs41_check_open_stateid(state);
2202 if (status != NFS_OK)
2203 status = nfs4_open_expired(sp, state);
2204 return status;
2205}
2206#endif
2207
2208/*
2209 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2210 * fields corresponding to attributes that were used to store the verifier.
2211 * Make sure we clobber those fields in the later setattr call
2212 */
2213static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2214{
2215 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2216 !(sattr->ia_valid & ATTR_ATIME_SET))
2217 sattr->ia_valid |= ATTR_ATIME;
2218
2219 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2220 !(sattr->ia_valid & ATTR_MTIME_SET))
2221 sattr->ia_valid |= ATTR_MTIME;
2222}
2223
2224static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2225 fmode_t fmode,
2226 int flags,
2227 struct nfs_open_context *ctx)
2228{
2229 struct nfs4_state_owner *sp = opendata->owner;
2230 struct nfs_server *server = sp->so_server;
2231 struct dentry *dentry;
2232 struct nfs4_state *state;
2233 unsigned int seq;
2234 int ret;
2235
2236 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2237
2238 ret = _nfs4_proc_open(opendata);
2239 if (ret != 0)
2240 goto out;
2241
2242 state = nfs4_opendata_to_nfs4_state(opendata);
2243 ret = PTR_ERR(state);
2244 if (IS_ERR(state))
2245 goto out;
2246 if (server->caps & NFS_CAP_POSIX_LOCK)
2247 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2248
2249 dentry = opendata->dentry;
2250 if (dentry->d_inode == NULL) {
2251 /* FIXME: Is this d_drop() ever needed? */
2252 d_drop(dentry);
2253 dentry = d_add_unique(dentry, igrab(state->inode));
2254 if (dentry == NULL) {
2255 dentry = opendata->dentry;
2256 } else if (dentry != ctx->dentry) {
2257 dput(ctx->dentry);
2258 ctx->dentry = dget(dentry);
2259 }
2260 nfs_set_verifier(dentry,
2261 nfs_save_change_attribute(opendata->dir->d_inode));
2262 }
2263
2264 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2265 if (ret != 0)
2266 goto out;
2267
2268 ctx->state = state;
2269 if (dentry->d_inode == state->inode) {
2270 nfs_inode_attach_open_context(ctx);
2271 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2272 nfs4_schedule_stateid_recovery(server, state);
2273 }
2274out:
2275 return ret;
2276}
2277
2278/*
2279 * Returns a referenced nfs4_state
2280 */
2281static int _nfs4_do_open(struct inode *dir,
2282 struct nfs_open_context *ctx,
2283 int flags,
2284 struct iattr *sattr,
2285 struct nfs4_label *label,
2286 int *opened)
2287{
2288 struct nfs4_state_owner *sp;
2289 struct nfs4_state *state = NULL;
2290 struct nfs_server *server = NFS_SERVER(dir);
2291 struct nfs4_opendata *opendata;
2292 struct dentry *dentry = ctx->dentry;
2293 struct rpc_cred *cred = ctx->cred;
2294 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2295 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2296 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2297 struct nfs4_label *olabel = NULL;
2298 int status;
2299
2300 /* Protect against reboot recovery conflicts */
2301 status = -ENOMEM;
2302 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2303 if (sp == NULL) {
2304 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2305 goto out_err;
2306 }
2307 status = nfs4_recover_expired_lease(server);
2308 if (status != 0)
2309 goto err_put_state_owner;
2310 if (dentry->d_inode != NULL)
2311 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2312 status = -ENOMEM;
2313 if (dentry->d_inode)
2314 claim = NFS4_OPEN_CLAIM_FH;
2315 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2316 label, claim, GFP_KERNEL);
2317 if (opendata == NULL)
2318 goto err_put_state_owner;
2319
2320 if (label) {
2321 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2322 if (IS_ERR(olabel)) {
2323 status = PTR_ERR(olabel);
2324 goto err_opendata_put;
2325 }
2326 }
2327
2328 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2329 if (!opendata->f_attr.mdsthreshold) {
2330 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2331 if (!opendata->f_attr.mdsthreshold)
2332 goto err_free_label;
2333 }
2334 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2335 }
2336 if (dentry->d_inode != NULL)
2337 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2338
2339 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2340 if (status != 0)
2341 goto err_free_label;
2342 state = ctx->state;
2343
2344 if ((opendata->o_arg.open_flags & O_EXCL) &&
2345 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2346 nfs4_exclusive_attrset(opendata, sattr);
2347
2348 nfs_fattr_init(opendata->o_res.f_attr);
2349 status = nfs4_do_setattr(state->inode, cred,
2350 opendata->o_res.f_attr, sattr,
2351 state, label, olabel);
2352 if (status == 0) {
2353 nfs_setattr_update_inode(state->inode, sattr);
2354 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2355 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2356 }
2357 }
2358 if (opendata->file_created)
2359 *opened |= FILE_CREATED;
2360
2361 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2362 *ctx_th = opendata->f_attr.mdsthreshold;
2363 opendata->f_attr.mdsthreshold = NULL;
2364 }
2365
2366 nfs4_label_free(olabel);
2367
2368 nfs4_opendata_put(opendata);
2369 nfs4_put_state_owner(sp);
2370 return 0;
2371err_free_label:
2372 nfs4_label_free(olabel);
2373err_opendata_put:
2374 nfs4_opendata_put(opendata);
2375err_put_state_owner:
2376 nfs4_put_state_owner(sp);
2377out_err:
2378 return status;
2379}
2380
2381
2382static struct nfs4_state *nfs4_do_open(struct inode *dir,
2383 struct nfs_open_context *ctx,
2384 int flags,
2385 struct iattr *sattr,
2386 struct nfs4_label *label,
2387 int *opened)
2388{
2389 struct nfs_server *server = NFS_SERVER(dir);
2390 struct nfs4_exception exception = { };
2391 struct nfs4_state *res;
2392 int status;
2393
2394 do {
2395 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2396 res = ctx->state;
2397 trace_nfs4_open_file(ctx, flags, status);
2398 if (status == 0)
2399 break;
2400 /* NOTE: BAD_SEQID means the server and client disagree about the
2401 * book-keeping w.r.t. state-changing operations
2402 * (OPEN/CLOSE/LOCK/LOCKU...)
2403 * It is actually a sign of a bug on the client or on the server.
2404 *
2405 * If we receive a BAD_SEQID error in the particular case of
2406 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2407 * have unhashed the old state_owner for us, and that we can
2408 * therefore safely retry using a new one. We should still warn
2409 * the user though...
2410 */
2411 if (status == -NFS4ERR_BAD_SEQID) {
2412 pr_warn_ratelimited("NFS: v4 server %s "
2413 " returned a bad sequence-id error!\n",
2414 NFS_SERVER(dir)->nfs_client->cl_hostname);
2415 exception.retry = 1;
2416 continue;
2417 }
2418 /*
2419 * BAD_STATEID on OPEN means that the server cancelled our
2420 * state before it received the OPEN_CONFIRM.
2421 * Recover by retrying the request as per the discussion
2422 * on Page 181 of RFC3530.
2423 */
2424 if (status == -NFS4ERR_BAD_STATEID) {
2425 exception.retry = 1;
2426 continue;
2427 }
2428 if (status == -EAGAIN) {
2429 /* We must have found a delegation */
2430 exception.retry = 1;
2431 continue;
2432 }
2433 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2434 continue;
2435 res = ERR_PTR(nfs4_handle_exception(server,
2436 status, &exception));
2437 } while (exception.retry);
2438 return res;
2439}
2440
2441static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2442 struct nfs_fattr *fattr, struct iattr *sattr,
2443 struct nfs4_state *state, struct nfs4_label *ilabel,
2444 struct nfs4_label *olabel)
2445{
2446 struct nfs_server *server = NFS_SERVER(inode);
2447 struct nfs_setattrargs arg = {
2448 .fh = NFS_FH(inode),
2449 .iap = sattr,
2450 .server = server,
2451 .bitmask = server->attr_bitmask,
2452 .label = ilabel,
2453 };
2454 struct nfs_setattrres res = {
2455 .fattr = fattr,
2456 .label = olabel,
2457 .server = server,
2458 };
2459 struct rpc_message msg = {
2460 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2461 .rpc_argp = &arg,
2462 .rpc_resp = &res,
2463 .rpc_cred = cred,
2464 };
2465 unsigned long timestamp = jiffies;
2466 fmode_t fmode;
2467 bool truncate;
2468 int status;
2469
2470 arg.bitmask = nfs4_bitmask(server, ilabel);
2471 if (ilabel)
2472 arg.bitmask = nfs4_bitmask(server, olabel);
2473
2474 nfs_fattr_init(fattr);
2475
2476 /* Servers should only apply open mode checks for file size changes */
2477 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2478 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2479
2480 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2481 /* Use that stateid */
2482 } else if (truncate && state != NULL) {
2483 struct nfs_lockowner lockowner = {
2484 .l_owner = current->files,
2485 .l_pid = current->tgid,
2486 };
2487 if (!nfs4_valid_open_stateid(state))
2488 return -EBADF;
2489 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2490 &lockowner) == -EIO)
2491 return -EBADF;
2492 } else
2493 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2494
2495 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2496 if (status == 0 && state != NULL)
2497 renew_lease(server, timestamp);
2498 return status;
2499}
2500
2501static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2502 struct nfs_fattr *fattr, struct iattr *sattr,
2503 struct nfs4_state *state, struct nfs4_label *ilabel,
2504 struct nfs4_label *olabel)
2505{
2506 struct nfs_server *server = NFS_SERVER(inode);
2507 struct nfs4_exception exception = {
2508 .state = state,
2509 .inode = inode,
2510 };
2511 int err;
2512 do {
2513 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2514 trace_nfs4_setattr(inode, err);
2515 switch (err) {
2516 case -NFS4ERR_OPENMODE:
2517 if (!(sattr->ia_valid & ATTR_SIZE)) {
2518 pr_warn_once("NFSv4: server %s is incorrectly "
2519 "applying open mode checks to "
2520 "a SETATTR that is not "
2521 "changing file size.\n",
2522 server->nfs_client->cl_hostname);
2523 }
2524 if (state && !(state->state & FMODE_WRITE)) {
2525 err = -EBADF;
2526 if (sattr->ia_valid & ATTR_OPEN)
2527 err = -EACCES;
2528 goto out;
2529 }
2530 }
2531 err = nfs4_handle_exception(server, err, &exception);
2532 } while (exception.retry);
2533out:
2534 return err;
2535}
2536
2537struct nfs4_closedata {
2538 struct inode *inode;
2539 struct nfs4_state *state;
2540 struct nfs_closeargs arg;
2541 struct nfs_closeres res;
2542 struct nfs_fattr fattr;
2543 unsigned long timestamp;
2544 bool roc;
2545 u32 roc_barrier;
2546};
2547
2548static void nfs4_free_closedata(void *data)
2549{
2550 struct nfs4_closedata *calldata = data;
2551 struct nfs4_state_owner *sp = calldata->state->owner;
2552 struct super_block *sb = calldata->state->inode->i_sb;
2553
2554 if (calldata->roc)
2555 pnfs_roc_release(calldata->state->inode);
2556 nfs4_put_open_state(calldata->state);
2557 nfs_free_seqid(calldata->arg.seqid);
2558 nfs4_put_state_owner(sp);
2559 nfs_sb_deactive(sb);
2560 kfree(calldata);
2561}
2562
2563static void nfs4_close_done(struct rpc_task *task, void *data)
2564{
2565 struct nfs4_closedata *calldata = data;
2566 struct nfs4_state *state = calldata->state;
2567 struct nfs_server *server = NFS_SERVER(calldata->inode);
2568 nfs4_stateid *res_stateid = NULL;
2569
2570 dprintk("%s: begin!\n", __func__);
2571 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2572 return;
2573 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2574 /* hmm. we are done with the inode, and in the process of freeing
2575 * the state_owner. we keep this around to process errors
2576 */
2577 switch (task->tk_status) {
2578 case 0:
2579 res_stateid = &calldata->res.stateid;
2580 if (calldata->arg.fmode == 0 && calldata->roc)
2581 pnfs_roc_set_barrier(state->inode,
2582 calldata->roc_barrier);
2583 renew_lease(server, calldata->timestamp);
2584 break;
2585 case -NFS4ERR_ADMIN_REVOKED:
2586 case -NFS4ERR_STALE_STATEID:
2587 case -NFS4ERR_OLD_STATEID:
2588 case -NFS4ERR_BAD_STATEID:
2589 case -NFS4ERR_EXPIRED:
2590 if (!nfs4_stateid_match(&calldata->arg.stateid,
2591 &state->stateid)) {
2592 rpc_restart_call_prepare(task);
2593 goto out_release;
2594 }
2595 if (calldata->arg.fmode == 0)
2596 break;
2597 default:
2598 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2599 rpc_restart_call_prepare(task);
2600 goto out_release;
2601 }
2602 }
2603 nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2604out_release:
2605 nfs_release_seqid(calldata->arg.seqid);
2606 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2607 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2608}
2609
2610static void nfs4_close_prepare(struct rpc_task *task, void *data)
2611{
2612 struct nfs4_closedata *calldata = data;
2613 struct nfs4_state *state = calldata->state;
2614 struct inode *inode = calldata->inode;
2615 bool is_rdonly, is_wronly, is_rdwr;
2616 int call_close = 0;
2617
2618 dprintk("%s: begin!\n", __func__);
2619 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2620 goto out_wait;
2621
2622 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2623 spin_lock(&state->owner->so_lock);
2624 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2625 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2626 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2627 nfs4_stateid_copy(&calldata->arg.stateid, &state->stateid);
2628 /* Calculate the change in open mode */
2629 calldata->arg.fmode = 0;
2630 if (state->n_rdwr == 0) {
2631 if (state->n_rdonly == 0)
2632 call_close |= is_rdonly;
2633 else if (is_rdonly)
2634 calldata->arg.fmode |= FMODE_READ;
2635 if (state->n_wronly == 0)
2636 call_close |= is_wronly;
2637 else if (is_wronly)
2638 calldata->arg.fmode |= FMODE_WRITE;
2639 } else if (is_rdwr)
2640 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2641
2642 if (calldata->arg.fmode == 0)
2643 call_close |= is_rdwr;
2644
2645 if (!nfs4_valid_open_stateid(state))
2646 call_close = 0;
2647 spin_unlock(&state->owner->so_lock);
2648
2649 if (!call_close) {
2650 /* Note: exit _without_ calling nfs4_close_done */
2651 goto out_no_action;
2652 }
2653
2654 if (calldata->arg.fmode == 0) {
2655 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2656 if (calldata->roc &&
2657 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2658 nfs_release_seqid(calldata->arg.seqid);
2659 goto out_wait;
2660 }
2661 }
2662
2663 nfs_fattr_init(calldata->res.fattr);
2664 calldata->timestamp = jiffies;
2665 if (nfs4_setup_sequence(NFS_SERVER(inode),
2666 &calldata->arg.seq_args,
2667 &calldata->res.seq_res,
2668 task) != 0)
2669 nfs_release_seqid(calldata->arg.seqid);
2670 dprintk("%s: done!\n", __func__);
2671 return;
2672out_no_action:
2673 task->tk_action = NULL;
2674out_wait:
2675 nfs4_sequence_done(task, &calldata->res.seq_res);
2676}
2677
2678static const struct rpc_call_ops nfs4_close_ops = {
2679 .rpc_call_prepare = nfs4_close_prepare,
2680 .rpc_call_done = nfs4_close_done,
2681 .rpc_release = nfs4_free_closedata,
2682};
2683
2684static bool nfs4_state_has_opener(struct nfs4_state *state)
2685{
2686 /* first check existing openers */
2687 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2688 state->n_rdonly != 0)
2689 return true;
2690
2691 if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2692 state->n_wronly != 0)
2693 return true;
2694
2695 if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2696 state->n_rdwr != 0)
2697 return true;
2698
2699 return false;
2700}
2701
2702static bool nfs4_roc(struct inode *inode)
2703{
2704 struct nfs_inode *nfsi = NFS_I(inode);
2705 struct nfs_open_context *ctx;
2706 struct nfs4_state *state;
2707
2708 spin_lock(&inode->i_lock);
2709 list_for_each_entry(ctx, &nfsi->open_files, list) {
2710 state = ctx->state;
2711 if (state == NULL)
2712 continue;
2713 if (nfs4_state_has_opener(state)) {
2714 spin_unlock(&inode->i_lock);
2715 return false;
2716 }
2717 }
2718 spin_unlock(&inode->i_lock);
2719
2720 if (nfs4_check_delegation(inode, FMODE_READ))
2721 return false;
2722
2723 return pnfs_roc(inode);
2724}
2725
2726/*
2727 * It is possible for data to be read/written from a mem-mapped file
2728 * after the sys_close call (which hits the vfs layer as a flush).
2729 * This means that we can't safely call nfsv4 close on a file until
2730 * the inode is cleared. This in turn means that we are not good
2731 * NFSv4 citizens - we do not indicate to the server to update the file's
2732 * share state even when we are done with one of the three share
2733 * stateid's in the inode.
2734 *
2735 * NOTE: Caller must be holding the sp->so_owner semaphore!
2736 */
2737int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2738{
2739 struct nfs_server *server = NFS_SERVER(state->inode);
2740 struct nfs4_closedata *calldata;
2741 struct nfs4_state_owner *sp = state->owner;
2742 struct rpc_task *task;
2743 struct rpc_message msg = {
2744 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2745 .rpc_cred = state->owner->so_cred,
2746 };
2747 struct rpc_task_setup task_setup_data = {
2748 .rpc_client = server->client,
2749 .rpc_message = &msg,
2750 .callback_ops = &nfs4_close_ops,
2751 .workqueue = nfsiod_workqueue,
2752 .flags = RPC_TASK_ASYNC,
2753 };
2754 int status = -ENOMEM;
2755
2756 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2757 &task_setup_data.rpc_client, &msg);
2758
2759 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2760 if (calldata == NULL)
2761 goto out;
2762 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2763 calldata->inode = state->inode;
2764 calldata->state = state;
2765 calldata->arg.fh = NFS_FH(state->inode);
2766 /* Serialization for the sequence id */
2767 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2768 if (calldata->arg.seqid == NULL)
2769 goto out_free_calldata;
2770 calldata->arg.fmode = 0;
2771 calldata->arg.bitmask = server->cache_consistency_bitmask;
2772 calldata->res.fattr = &calldata->fattr;
2773 calldata->res.seqid = calldata->arg.seqid;
2774 calldata->res.server = server;
2775 calldata->roc = nfs4_roc(state->inode);
2776 nfs_sb_active(calldata->inode->i_sb);
2777
2778 msg.rpc_argp = &calldata->arg;
2779 msg.rpc_resp = &calldata->res;
2780 task_setup_data.callback_data = calldata;
2781 task = rpc_run_task(&task_setup_data);
2782 if (IS_ERR(task))
2783 return PTR_ERR(task);
2784 status = 0;
2785 if (wait)
2786 status = rpc_wait_for_completion_task(task);
2787 rpc_put_task(task);
2788 return status;
2789out_free_calldata:
2790 kfree(calldata);
2791out:
2792 nfs4_put_open_state(state);
2793 nfs4_put_state_owner(sp);
2794 return status;
2795}
2796
2797static struct inode *
2798nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2799 int open_flags, struct iattr *attr, int *opened)
2800{
2801 struct nfs4_state *state;
2802 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2803
2804 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2805
2806 /* Protect against concurrent sillydeletes */
2807 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2808
2809 nfs4_label_release_security(label);
2810
2811 if (IS_ERR(state))
2812 return ERR_CAST(state);
2813 return state->inode;
2814}
2815
2816static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2817{
2818 if (ctx->state == NULL)
2819 return;
2820 if (is_sync)
2821 nfs4_close_sync(ctx->state, ctx->mode);
2822 else
2823 nfs4_close_state(ctx->state, ctx->mode);
2824}
2825
2826#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2827#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2828#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2829
2830static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2831{
2832 struct nfs4_server_caps_arg args = {
2833 .fhandle = fhandle,
2834 };
2835 struct nfs4_server_caps_res res = {};
2836 struct rpc_message msg = {
2837 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2838 .rpc_argp = &args,
2839 .rpc_resp = &res,
2840 };
2841 int status;
2842
2843 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2844 if (status == 0) {
2845 /* Sanity check the server answers */
2846 switch (server->nfs_client->cl_minorversion) {
2847 case 0:
2848 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2849 res.attr_bitmask[2] = 0;
2850 break;
2851 case 1:
2852 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2853 break;
2854 case 2:
2855 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2856 }
2857 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2858 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2859 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2860 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2861 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2862 NFS_CAP_CTIME|NFS_CAP_MTIME|
2863 NFS_CAP_SECURITY_LABEL);
2864 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2865 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2866 server->caps |= NFS_CAP_ACLS;
2867 if (res.has_links != 0)
2868 server->caps |= NFS_CAP_HARDLINKS;
2869 if (res.has_symlinks != 0)
2870 server->caps |= NFS_CAP_SYMLINKS;
2871 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2872 server->caps |= NFS_CAP_FILEID;
2873 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2874 server->caps |= NFS_CAP_MODE;
2875 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2876 server->caps |= NFS_CAP_NLINK;
2877 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2878 server->caps |= NFS_CAP_OWNER;
2879 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2880 server->caps |= NFS_CAP_OWNER_GROUP;
2881 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2882 server->caps |= NFS_CAP_ATIME;
2883 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2884 server->caps |= NFS_CAP_CTIME;
2885 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2886 server->caps |= NFS_CAP_MTIME;
2887#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2888 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2889 server->caps |= NFS_CAP_SECURITY_LABEL;
2890#endif
2891 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2892 sizeof(server->attr_bitmask));
2893 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2894
2895 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2896 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2897 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2898 server->cache_consistency_bitmask[2] = 0;
2899 server->acl_bitmask = res.acl_bitmask;
2900 server->fh_expire_type = res.fh_expire_type;
2901 }
2902
2903 return status;
2904}
2905
2906int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2907{
2908 struct nfs4_exception exception = { };
2909 int err;
2910 do {
2911 err = nfs4_handle_exception(server,
2912 _nfs4_server_capabilities(server, fhandle),
2913 &exception);
2914 } while (exception.retry);
2915 return err;
2916}
2917
2918static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2919 struct nfs_fsinfo *info)
2920{
2921 u32 bitmask[3];
2922 struct nfs4_lookup_root_arg args = {
2923 .bitmask = bitmask,
2924 };
2925 struct nfs4_lookup_res res = {
2926 .server = server,
2927 .fattr = info->fattr,
2928 .fh = fhandle,
2929 };
2930 struct rpc_message msg = {
2931 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2932 .rpc_argp = &args,
2933 .rpc_resp = &res,
2934 };
2935
2936 bitmask[0] = nfs4_fattr_bitmap[0];
2937 bitmask[1] = nfs4_fattr_bitmap[1];
2938 /*
2939 * Process the label in the upcoming getfattr
2940 */
2941 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2942
2943 nfs_fattr_init(info->fattr);
2944 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2945}
2946
2947static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2948 struct nfs_fsinfo *info)
2949{
2950 struct nfs4_exception exception = { };
2951 int err;
2952 do {
2953 err = _nfs4_lookup_root(server, fhandle, info);
2954 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2955 switch (err) {
2956 case 0:
2957 case -NFS4ERR_WRONGSEC:
2958 goto out;
2959 default:
2960 err = nfs4_handle_exception(server, err, &exception);
2961 }
2962 } while (exception.retry);
2963out:
2964 return err;
2965}
2966
2967static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2968 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2969{
2970 struct rpc_auth_create_args auth_args = {
2971 .pseudoflavor = flavor,
2972 };
2973 struct rpc_auth *auth;
2974 int ret;
2975
2976 auth = rpcauth_create(&auth_args, server->client);
2977 if (IS_ERR(auth)) {
2978 ret = -EACCES;
2979 goto out;
2980 }
2981 ret = nfs4_lookup_root(server, fhandle, info);
2982out:
2983 return ret;
2984}
2985
2986/*
2987 * Retry pseudoroot lookup with various security flavors. We do this when:
2988 *
2989 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2990 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2991 *
2992 * Returns zero on success, or a negative NFS4ERR value, or a
2993 * negative errno value.
2994 */
2995static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2996 struct nfs_fsinfo *info)
2997{
2998 /* Per 3530bis 15.33.5 */
2999 static const rpc_authflavor_t flav_array[] = {
3000 RPC_AUTH_GSS_KRB5P,
3001 RPC_AUTH_GSS_KRB5I,
3002 RPC_AUTH_GSS_KRB5,
3003 RPC_AUTH_UNIX, /* courtesy */
3004 RPC_AUTH_NULL,
3005 };
3006 int status = -EPERM;
3007 size_t i;
3008
3009 if (server->auth_info.flavor_len > 0) {
3010 /* try each flavor specified by user */
3011 for (i = 0; i < server->auth_info.flavor_len; i++) {
3012 status = nfs4_lookup_root_sec(server, fhandle, info,
3013 server->auth_info.flavors[i]);
3014 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3015 continue;
3016 break;
3017 }
3018 } else {
3019 /* no flavors specified by user, try default list */
3020 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3021 status = nfs4_lookup_root_sec(server, fhandle, info,
3022 flav_array[i]);
3023 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3024 continue;
3025 break;
3026 }
3027 }
3028
3029 /*
3030 * -EACCESS could mean that the user doesn't have correct permissions
3031 * to access the mount. It could also mean that we tried to mount
3032 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
3033 * existing mount programs don't handle -EACCES very well so it should
3034 * be mapped to -EPERM instead.
3035 */
3036 if (status == -EACCES)
3037 status = -EPERM;
3038 return status;
3039}
3040
3041static int nfs4_do_find_root_sec(struct nfs_server *server,
3042 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3043{
3044 int mv = server->nfs_client->cl_minorversion;
3045 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3046}
3047
3048/**
3049 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3050 * @server: initialized nfs_server handle
3051 * @fhandle: we fill in the pseudo-fs root file handle
3052 * @info: we fill in an FSINFO struct
3053 * @auth_probe: probe the auth flavours
3054 *
3055 * Returns zero on success, or a negative errno.
3056 */
3057int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3058 struct nfs_fsinfo *info,
3059 bool auth_probe)
3060{
3061 int status;
3062
3063 switch (auth_probe) {
3064 case false:
3065 status = nfs4_lookup_root(server, fhandle, info);
3066 if (status != -NFS4ERR_WRONGSEC)
3067 break;
3068 default:
3069 status = nfs4_do_find_root_sec(server, fhandle, info);
3070 }
3071
3072 if (status == 0)
3073 status = nfs4_server_capabilities(server, fhandle);
3074 if (status == 0)
3075 status = nfs4_do_fsinfo(server, fhandle, info);
3076
3077 return nfs4_map_errors(status);
3078}
3079
3080static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3081 struct nfs_fsinfo *info)
3082{
3083 int error;
3084 struct nfs_fattr *fattr = info->fattr;
3085 struct nfs4_label *label = NULL;
3086
3087 error = nfs4_server_capabilities(server, mntfh);
3088 if (error < 0) {
3089 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3090 return error;
3091 }
3092
3093 label = nfs4_label_alloc(server, GFP_KERNEL);
3094 if (IS_ERR(label))
3095 return PTR_ERR(label);
3096
3097 error = nfs4_proc_getattr(server, mntfh, fattr, label);
3098 if (error < 0) {
3099 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3100 goto err_free_label;
3101 }
3102
3103 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3104 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3105 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3106
3107err_free_label:
3108 nfs4_label_free(label);
3109
3110 return error;
3111}
3112
3113/*
3114 * Get locations and (maybe) other attributes of a referral.
3115 * Note that we'll actually follow the referral later when
3116 * we detect fsid mismatch in inode revalidation
3117 */
3118static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3119 const struct qstr *name, struct nfs_fattr *fattr,
3120 struct nfs_fh *fhandle)
3121{
3122 int status = -ENOMEM;
3123 struct page *page = NULL;
3124 struct nfs4_fs_locations *locations = NULL;
3125
3126 page = alloc_page(GFP_KERNEL);
3127 if (page == NULL)
3128 goto out;
3129 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3130 if (locations == NULL)
3131 goto out;
3132
3133 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3134 if (status != 0)
3135 goto out;
3136
3137 /*
3138 * If the fsid didn't change, this is a migration event, not a
3139 * referral. Cause us to drop into the exception handler, which
3140 * will kick off migration recovery.
3141 */
3142 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3143 dprintk("%s: server did not return a different fsid for"
3144 " a referral at %s\n", __func__, name->name);
3145 status = -NFS4ERR_MOVED;
3146 goto out;
3147 }
3148 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3149 nfs_fixup_referral_attributes(&locations->fattr);
3150
3151 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3152 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3153 memset(fhandle, 0, sizeof(struct nfs_fh));
3154out:
3155 if (page)
3156 __free_page(page);
3157 kfree(locations);
3158 return status;
3159}
3160
3161static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3162 struct nfs_fattr *fattr, struct nfs4_label *label)
3163{
3164 struct nfs4_getattr_arg args = {
3165 .fh = fhandle,
3166 .bitmask = server->attr_bitmask,
3167 };
3168 struct nfs4_getattr_res res = {
3169 .fattr = fattr,
3170 .label = label,
3171 .server = server,
3172 };
3173 struct rpc_message msg = {
3174 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3175 .rpc_argp = &args,
3176 .rpc_resp = &res,
3177 };
3178
3179 args.bitmask = nfs4_bitmask(server, label);
3180
3181 nfs_fattr_init(fattr);
3182 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3183}
3184
3185static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3186 struct nfs_fattr *fattr, struct nfs4_label *label)
3187{
3188 struct nfs4_exception exception = { };
3189 int err;
3190 do {
3191 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3192 trace_nfs4_getattr(server, fhandle, fattr, err);
3193 err = nfs4_handle_exception(server, err,
3194 &exception);
3195 } while (exception.retry);
3196 return err;
3197}
3198
3199/*
3200 * The file is not closed if it is opened due to the a request to change
3201 * the size of the file. The open call will not be needed once the
3202 * VFS layer lookup-intents are implemented.
3203 *
3204 * Close is called when the inode is destroyed.
3205 * If we haven't opened the file for O_WRONLY, we
3206 * need to in the size_change case to obtain a stateid.
3207 *
3208 * Got race?
3209 * Because OPEN is always done by name in nfsv4, it is
3210 * possible that we opened a different file by the same
3211 * name. We can recognize this race condition, but we
3212 * can't do anything about it besides returning an error.
3213 *
3214 * This will be fixed with VFS changes (lookup-intent).
3215 */
3216static int
3217nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3218 struct iattr *sattr)
3219{
3220 struct inode *inode = dentry->d_inode;
3221 struct rpc_cred *cred = NULL;
3222 struct nfs4_state *state = NULL;
3223 struct nfs4_label *label = NULL;
3224 int status;
3225
3226 if (pnfs_ld_layoutret_on_setattr(inode) &&
3227 sattr->ia_valid & ATTR_SIZE &&
3228 sattr->ia_size < i_size_read(inode))
3229 pnfs_commit_and_return_layout(inode);
3230
3231 nfs_fattr_init(fattr);
3232
3233 /* Deal with open(O_TRUNC) */
3234 if (sattr->ia_valid & ATTR_OPEN)
3235 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3236
3237 /* Optimization: if the end result is no change, don't RPC */
3238 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3239 return 0;
3240
3241 /* Search for an existing open(O_WRITE) file */
3242 if (sattr->ia_valid & ATTR_FILE) {
3243 struct nfs_open_context *ctx;
3244
3245 ctx = nfs_file_open_context(sattr->ia_file);
3246 if (ctx) {
3247 cred = ctx->cred;
3248 state = ctx->state;
3249 }
3250 }
3251
3252 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3253 if (IS_ERR(label))
3254 return PTR_ERR(label);
3255
3256 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3257 if (status == 0) {
3258 nfs_setattr_update_inode(inode, sattr);
3259 nfs_setsecurity(inode, fattr, label);
3260 }
3261 nfs4_label_free(label);
3262 return status;
3263}
3264
3265static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3266 const struct qstr *name, struct nfs_fh *fhandle,
3267 struct nfs_fattr *fattr, struct nfs4_label *label)
3268{
3269 struct nfs_server *server = NFS_SERVER(dir);
3270 int status;
3271 struct nfs4_lookup_arg args = {
3272 .bitmask = server->attr_bitmask,
3273 .dir_fh = NFS_FH(dir),
3274 .name = name,
3275 };
3276 struct nfs4_lookup_res res = {
3277 .server = server,
3278 .fattr = fattr,
3279 .label = label,
3280 .fh = fhandle,
3281 };
3282 struct rpc_message msg = {
3283 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3284 .rpc_argp = &args,
3285 .rpc_resp = &res,
3286 };
3287
3288 args.bitmask = nfs4_bitmask(server, label);
3289
3290 nfs_fattr_init(fattr);
3291
3292 dprintk("NFS call lookup %s\n", name->name);
3293 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3294 dprintk("NFS reply lookup: %d\n", status);
3295 return status;
3296}
3297
3298static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3299{
3300 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3301 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3302 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3303 fattr->nlink = 2;
3304}
3305
3306static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3307 struct qstr *name, struct nfs_fh *fhandle,
3308 struct nfs_fattr *fattr, struct nfs4_label *label)
3309{
3310 struct nfs4_exception exception = { };
3311 struct rpc_clnt *client = *clnt;
3312 int err;
3313 do {
3314 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3315 trace_nfs4_lookup(dir, name, err);
3316 switch (err) {
3317 case -NFS4ERR_BADNAME:
3318 err = -ENOENT;
3319 goto out;
3320 case -NFS4ERR_MOVED:
3321 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3322 goto out;
3323 case -NFS4ERR_WRONGSEC:
3324 err = -EPERM;
3325 if (client != *clnt)
3326 goto out;
3327 client = nfs4_negotiate_security(client, dir, name);
3328 if (IS_ERR(client))
3329 return PTR_ERR(client);
3330
3331 exception.retry = 1;
3332 break;
3333 default:
3334 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3335 }
3336 } while (exception.retry);
3337
3338out:
3339 if (err == 0)
3340 *clnt = client;
3341 else if (client != *clnt)
3342 rpc_shutdown_client(client);
3343
3344 return err;
3345}
3346
3347static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3348 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3349 struct nfs4_label *label)
3350{
3351 int status;
3352 struct rpc_clnt *client = NFS_CLIENT(dir);
3353
3354 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3355 if (client != NFS_CLIENT(dir)) {
3356 rpc_shutdown_client(client);
3357 nfs_fixup_secinfo_attributes(fattr);
3358 }
3359 return status;
3360}
3361
3362struct rpc_clnt *
3363nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3364 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3365{
3366 struct rpc_clnt *client = NFS_CLIENT(dir);
3367 int status;
3368
3369 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3370 if (status < 0)
3371 return ERR_PTR(status);
3372 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3373}
3374
3375static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3376{
3377 struct nfs_server *server = NFS_SERVER(inode);
3378 struct nfs4_accessargs args = {
3379 .fh = NFS_FH(inode),
3380 .bitmask = server->cache_consistency_bitmask,
3381 };
3382 struct nfs4_accessres res = {
3383 .server = server,
3384 };
3385 struct rpc_message msg = {
3386 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3387 .rpc_argp = &args,
3388 .rpc_resp = &res,
3389 .rpc_cred = entry->cred,
3390 };
3391 int mode = entry->mask;
3392 int status = 0;
3393
3394 /*
3395 * Determine which access bits we want to ask for...
3396 */
3397 if (mode & MAY_READ)
3398 args.access |= NFS4_ACCESS_READ;
3399 if (S_ISDIR(inode->i_mode)) {
3400 if (mode & MAY_WRITE)
3401 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3402 if (mode & MAY_EXEC)
3403 args.access |= NFS4_ACCESS_LOOKUP;
3404 } else {
3405 if (mode & MAY_WRITE)
3406 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3407 if (mode & MAY_EXEC)
3408 args.access |= NFS4_ACCESS_EXECUTE;
3409 }
3410
3411 res.fattr = nfs_alloc_fattr();
3412 if (res.fattr == NULL)
3413 return -ENOMEM;
3414
3415 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3416 if (!status) {
3417 nfs_access_set_mask(entry, res.access);
3418 nfs_refresh_inode(inode, res.fattr);
3419 }
3420 nfs_free_fattr(res.fattr);
3421 return status;
3422}
3423
3424static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3425{
3426 struct nfs4_exception exception = { };
3427 int err;
3428 do {
3429 err = _nfs4_proc_access(inode, entry);
3430 trace_nfs4_access(inode, err);
3431 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3432 &exception);
3433 } while (exception.retry);
3434 return err;
3435}
3436
3437/*
3438 * TODO: For the time being, we don't try to get any attributes
3439 * along with any of the zero-copy operations READ, READDIR,
3440 * READLINK, WRITE.
3441 *
3442 * In the case of the first three, we want to put the GETATTR
3443 * after the read-type operation -- this is because it is hard
3444 * to predict the length of a GETATTR response in v4, and thus
3445 * align the READ data correctly. This means that the GETATTR
3446 * may end up partially falling into the page cache, and we should
3447 * shift it into the 'tail' of the xdr_buf before processing.
3448 * To do this efficiently, we need to know the total length
3449 * of data received, which doesn't seem to be available outside
3450 * of the RPC layer.
3451 *
3452 * In the case of WRITE, we also want to put the GETATTR after
3453 * the operation -- in this case because we want to make sure
3454 * we get the post-operation mtime and size.
3455 *
3456 * Both of these changes to the XDR layer would in fact be quite
3457 * minor, but I decided to leave them for a subsequent patch.
3458 */
3459static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3460 unsigned int pgbase, unsigned int pglen)
3461{
3462 struct nfs4_readlink args = {
3463 .fh = NFS_FH(inode),
3464 .pgbase = pgbase,
3465 .pglen = pglen,
3466 .pages = &page,
3467 };
3468 struct nfs4_readlink_res res;
3469 struct rpc_message msg = {
3470 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3471 .rpc_argp = &args,
3472 .rpc_resp = &res,
3473 };
3474
3475 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3476}
3477
3478static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3479 unsigned int pgbase, unsigned int pglen)
3480{
3481 struct nfs4_exception exception = { };
3482 int err;
3483 do {
3484 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3485 trace_nfs4_readlink(inode, err);
3486 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3487 &exception);
3488 } while (exception.retry);
3489 return err;
3490}
3491
3492/*
3493 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3494 */
3495static int
3496nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3497 int flags)
3498{
3499 struct nfs4_label l, *ilabel = NULL;
3500 struct nfs_open_context *ctx;
3501 struct nfs4_state *state;
3502 int opened = 0;
3503 int status = 0;
3504
3505 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3506 if (IS_ERR(ctx))
3507 return PTR_ERR(ctx);
3508
3509 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3510
3511 sattr->ia_mode &= ~current_umask();
3512 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3513 if (IS_ERR(state)) {
3514 status = PTR_ERR(state);
3515 goto out;
3516 }
3517out:
3518 nfs4_label_release_security(ilabel);
3519 put_nfs_open_context(ctx);
3520 return status;
3521}
3522
3523static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3524{
3525 struct nfs_server *server = NFS_SERVER(dir);
3526 struct nfs_removeargs args = {
3527 .fh = NFS_FH(dir),
3528 .name = *name,
3529 };
3530 struct nfs_removeres res = {
3531 .server = server,
3532 };
3533 struct rpc_message msg = {
3534 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3535 .rpc_argp = &args,
3536 .rpc_resp = &res,
3537 };
3538 int status;
3539
3540 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3541 if (status == 0)
3542 update_changeattr(dir, &res.cinfo);
3543 return status;
3544}
3545
3546static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3547{
3548 struct nfs4_exception exception = { };
3549 int err;
3550 do {
3551 err = _nfs4_proc_remove(dir, name);
3552 trace_nfs4_remove(dir, name, err);
3553 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3554 &exception);
3555 } while (exception.retry);
3556 return err;
3557}
3558
3559static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3560{
3561 struct nfs_server *server = NFS_SERVER(dir);
3562 struct nfs_removeargs *args = msg->rpc_argp;
3563 struct nfs_removeres *res = msg->rpc_resp;
3564
3565 res->server = server;
3566 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3567 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3568
3569 nfs_fattr_init(res->dir_attr);
3570}
3571
3572static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3573{
3574 nfs4_setup_sequence(NFS_SERVER(data->dir),
3575 &data->args.seq_args,
3576 &data->res.seq_res,
3577 task);
3578}
3579
3580static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3581{
3582 struct nfs_unlinkdata *data = task->tk_calldata;
3583 struct nfs_removeres *res = &data->res;
3584
3585 if (!nfs4_sequence_done(task, &res->seq_res))
3586 return 0;
3587 if (nfs4_async_handle_error(task, res->server, NULL,
3588 &data->timeout) == -EAGAIN)
3589 return 0;
3590 update_changeattr(dir, &res->cinfo);
3591 return 1;
3592}
3593
3594static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3595{
3596 struct nfs_server *server = NFS_SERVER(dir);
3597 struct nfs_renameargs *arg = msg->rpc_argp;
3598 struct nfs_renameres *res = msg->rpc_resp;
3599
3600 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3601 res->server = server;
3602 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3603}
3604
3605static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3606{
3607 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3608 &data->args.seq_args,
3609 &data->res.seq_res,
3610 task);
3611}
3612
3613static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3614 struct inode *new_dir)
3615{
3616 struct nfs_renamedata *data = task->tk_calldata;
3617 struct nfs_renameres *res = &data->res;
3618
3619 if (!nfs4_sequence_done(task, &res->seq_res))
3620 return 0;
3621 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3622 return 0;
3623
3624 update_changeattr(old_dir, &res->old_cinfo);
3625 update_changeattr(new_dir, &res->new_cinfo);
3626 return 1;
3627}
3628
3629static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3630{
3631 struct nfs_server *server = NFS_SERVER(inode);
3632 struct nfs4_link_arg arg = {
3633 .fh = NFS_FH(inode),
3634 .dir_fh = NFS_FH(dir),
3635 .name = name,
3636 .bitmask = server->attr_bitmask,
3637 };
3638 struct nfs4_link_res res = {
3639 .server = server,
3640 .label = NULL,
3641 };
3642 struct rpc_message msg = {
3643 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3644 .rpc_argp = &arg,
3645 .rpc_resp = &res,
3646 };
3647 int status = -ENOMEM;
3648
3649 res.fattr = nfs_alloc_fattr();
3650 if (res.fattr == NULL)
3651 goto out;
3652
3653 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3654 if (IS_ERR(res.label)) {
3655 status = PTR_ERR(res.label);
3656 goto out;
3657 }
3658 arg.bitmask = nfs4_bitmask(server, res.label);
3659
3660 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3661 if (!status) {
3662 update_changeattr(dir, &res.cinfo);
3663 status = nfs_post_op_update_inode(inode, res.fattr);
3664 if (!status)
3665 nfs_setsecurity(inode, res.fattr, res.label);
3666 }
3667
3668
3669 nfs4_label_free(res.label);
3670
3671out:
3672 nfs_free_fattr(res.fattr);
3673 return status;
3674}
3675
3676static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3677{
3678 struct nfs4_exception exception = { };
3679 int err;
3680 do {
3681 err = nfs4_handle_exception(NFS_SERVER(inode),
3682 _nfs4_proc_link(inode, dir, name),
3683 &exception);
3684 } while (exception.retry);
3685 return err;
3686}
3687
3688struct nfs4_createdata {
3689 struct rpc_message msg;
3690 struct nfs4_create_arg arg;
3691 struct nfs4_create_res res;
3692 struct nfs_fh fh;
3693 struct nfs_fattr fattr;
3694 struct nfs4_label *label;
3695};
3696
3697static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3698 struct qstr *name, struct iattr *sattr, u32 ftype)
3699{
3700 struct nfs4_createdata *data;
3701
3702 data = kzalloc(sizeof(*data), GFP_KERNEL);
3703 if (data != NULL) {
3704 struct nfs_server *server = NFS_SERVER(dir);
3705
3706 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3707 if (IS_ERR(data->label))
3708 goto out_free;
3709
3710 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3711 data->msg.rpc_argp = &data->arg;
3712 data->msg.rpc_resp = &data->res;
3713 data->arg.dir_fh = NFS_FH(dir);
3714 data->arg.server = server;
3715 data->arg.name = name;
3716 data->arg.attrs = sattr;
3717 data->arg.ftype = ftype;
3718 data->arg.bitmask = nfs4_bitmask(server, data->label);
3719 data->res.server = server;
3720 data->res.fh = &data->fh;
3721 data->res.fattr = &data->fattr;
3722 data->res.label = data->label;
3723 nfs_fattr_init(data->res.fattr);
3724 }
3725 return data;
3726out_free:
3727 kfree(data);
3728 return NULL;
3729}
3730
3731static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3732{
3733 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3734 &data->arg.seq_args, &data->res.seq_res, 1);
3735 if (status == 0) {
3736 update_changeattr(dir, &data->res.dir_cinfo);
3737 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3738 }
3739 return status;
3740}
3741
3742static void nfs4_free_createdata(struct nfs4_createdata *data)
3743{
3744 nfs4_label_free(data->label);
3745 kfree(data);
3746}
3747
3748static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3749 struct page *page, unsigned int len, struct iattr *sattr,
3750 struct nfs4_label *label)
3751{
3752 struct nfs4_createdata *data;
3753 int status = -ENAMETOOLONG;
3754
3755 if (len > NFS4_MAXPATHLEN)
3756 goto out;
3757
3758 status = -ENOMEM;
3759 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3760 if (data == NULL)
3761 goto out;
3762
3763 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3764 data->arg.u.symlink.pages = &page;
3765 data->arg.u.symlink.len = len;
3766 data->arg.label = label;
3767
3768 status = nfs4_do_create(dir, dentry, data);
3769
3770 nfs4_free_createdata(data);
3771out:
3772 return status;
3773}
3774
3775static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3776 struct page *page, unsigned int len, struct iattr *sattr)
3777{
3778 struct nfs4_exception exception = { };
3779 struct nfs4_label l, *label = NULL;
3780 int err;
3781
3782 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3783
3784 do {
3785 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3786 trace_nfs4_symlink(dir, &dentry->d_name, err);
3787 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3788 &exception);
3789 } while (exception.retry);
3790
3791 nfs4_label_release_security(label);
3792 return err;
3793}
3794
3795static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3796 struct iattr *sattr, struct nfs4_label *label)
3797{
3798 struct nfs4_createdata *data;
3799 int status = -ENOMEM;
3800
3801 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3802 if (data == NULL)
3803 goto out;
3804
3805 data->arg.label = label;
3806 status = nfs4_do_create(dir, dentry, data);
3807
3808 nfs4_free_createdata(data);
3809out:
3810 return status;
3811}
3812
3813static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3814 struct iattr *sattr)
3815{
3816 struct nfs4_exception exception = { };
3817 struct nfs4_label l, *label = NULL;
3818 int err;
3819
3820 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3821
3822 sattr->ia_mode &= ~current_umask();
3823 do {
3824 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3825 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3826 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3827 &exception);
3828 } while (exception.retry);
3829 nfs4_label_release_security(label);
3830
3831 return err;
3832}
3833
3834static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3835 u64 cookie, struct page **pages, unsigned int count, int plus)
3836{
3837 struct inode *dir = dentry->d_inode;
3838 struct nfs4_readdir_arg args = {
3839 .fh = NFS_FH(dir),
3840 .pages = pages,
3841 .pgbase = 0,
3842 .count = count,
3843 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3844 .plus = plus,
3845 };
3846 struct nfs4_readdir_res res;
3847 struct rpc_message msg = {
3848 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3849 .rpc_argp = &args,
3850 .rpc_resp = &res,
3851 .rpc_cred = cred,
3852 };
3853 int status;
3854
3855 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3856 dentry,
3857 (unsigned long long)cookie);
3858 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3859 res.pgbase = args.pgbase;
3860 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3861 if (status >= 0) {
3862 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3863 status += args.pgbase;
3864 }
3865
3866 nfs_invalidate_atime(dir);
3867
3868 dprintk("%s: returns %d\n", __func__, status);
3869 return status;
3870}
3871
3872static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3873 u64 cookie, struct page **pages, unsigned int count, int plus)
3874{
3875 struct nfs4_exception exception = { };
3876 int err;
3877 do {
3878 err = _nfs4_proc_readdir(dentry, cred, cookie,
3879 pages, count, plus);
3880 trace_nfs4_readdir(dentry->d_inode, err);
3881 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3882 &exception);
3883 } while (exception.retry);
3884 return err;
3885}
3886
3887static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3888 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3889{
3890 struct nfs4_createdata *data;
3891 int mode = sattr->ia_mode;
3892 int status = -ENOMEM;
3893
3894 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3895 if (data == NULL)
3896 goto out;
3897
3898 if (S_ISFIFO(mode))
3899 data->arg.ftype = NF4FIFO;
3900 else if (S_ISBLK(mode)) {
3901 data->arg.ftype = NF4BLK;
3902 data->arg.u.device.specdata1 = MAJOR(rdev);
3903 data->arg.u.device.specdata2 = MINOR(rdev);
3904 }
3905 else if (S_ISCHR(mode)) {
3906 data->arg.ftype = NF4CHR;
3907 data->arg.u.device.specdata1 = MAJOR(rdev);
3908 data->arg.u.device.specdata2 = MINOR(rdev);
3909 } else if (!S_ISSOCK(mode)) {
3910 status = -EINVAL;
3911 goto out_free;
3912 }
3913
3914 data->arg.label = label;
3915 status = nfs4_do_create(dir, dentry, data);
3916out_free:
3917 nfs4_free_createdata(data);
3918out:
3919 return status;
3920}
3921
3922static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3923 struct iattr *sattr, dev_t rdev)
3924{
3925 struct nfs4_exception exception = { };
3926 struct nfs4_label l, *label = NULL;
3927 int err;
3928
3929 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3930
3931 sattr->ia_mode &= ~current_umask();
3932 do {
3933 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3934 trace_nfs4_mknod(dir, &dentry->d_name, err);
3935 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3936 &exception);
3937 } while (exception.retry);
3938
3939 nfs4_label_release_security(label);
3940
3941 return err;
3942}
3943
3944static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3945 struct nfs_fsstat *fsstat)
3946{
3947 struct nfs4_statfs_arg args = {
3948 .fh = fhandle,
3949 .bitmask = server->attr_bitmask,
3950 };
3951 struct nfs4_statfs_res res = {
3952 .fsstat = fsstat,
3953 };
3954 struct rpc_message msg = {
3955 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3956 .rpc_argp = &args,
3957 .rpc_resp = &res,
3958 };
3959
3960 nfs_fattr_init(fsstat->fattr);
3961 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3962}
3963
3964static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3965{
3966 struct nfs4_exception exception = { };
3967 int err;
3968 do {
3969 err = nfs4_handle_exception(server,
3970 _nfs4_proc_statfs(server, fhandle, fsstat),
3971 &exception);
3972 } while (exception.retry);
3973 return err;
3974}
3975
3976static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3977 struct nfs_fsinfo *fsinfo)
3978{
3979 struct nfs4_fsinfo_arg args = {
3980 .fh = fhandle,
3981 .bitmask = server->attr_bitmask,
3982 };
3983 struct nfs4_fsinfo_res res = {
3984 .fsinfo = fsinfo,
3985 };
3986 struct rpc_message msg = {
3987 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3988 .rpc_argp = &args,
3989 .rpc_resp = &res,
3990 };
3991
3992 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3993}
3994
3995static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3996{
3997 struct nfs4_exception exception = { };
3998 unsigned long now = jiffies;
3999 int err;
4000
4001 do {
4002 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4003 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4004 if (err == 0) {
4005 struct nfs_client *clp = server->nfs_client;
4006
4007 spin_lock(&clp->cl_lock);
4008 clp->cl_lease_time = fsinfo->lease_time * HZ;
4009 clp->cl_last_renewal = now;
4010 spin_unlock(&clp->cl_lock);
4011 break;
4012 }
4013 err = nfs4_handle_exception(server, err, &exception);
4014 } while (exception.retry);
4015 return err;
4016}
4017
4018static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4019{
4020 int error;
4021
4022 nfs_fattr_init(fsinfo->fattr);
4023 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4024 if (error == 0) {
4025 /* block layout checks this! */
4026 server->pnfs_blksize = fsinfo->blksize;
4027 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4028 }
4029
4030 return error;
4031}
4032
4033static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4034 struct nfs_pathconf *pathconf)
4035{
4036 struct nfs4_pathconf_arg args = {
4037 .fh = fhandle,
4038 .bitmask = server->attr_bitmask,
4039 };
4040 struct nfs4_pathconf_res res = {
4041 .pathconf = pathconf,
4042 };
4043 struct rpc_message msg = {
4044 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4045 .rpc_argp = &args,
4046 .rpc_resp = &res,
4047 };
4048
4049 /* None of the pathconf attributes are mandatory to implement */
4050 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4051 memset(pathconf, 0, sizeof(*pathconf));
4052 return 0;
4053 }
4054
4055 nfs_fattr_init(pathconf->fattr);
4056 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4057}
4058
4059static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4060 struct nfs_pathconf *pathconf)
4061{
4062 struct nfs4_exception exception = { };
4063 int err;
4064
4065 do {
4066 err = nfs4_handle_exception(server,
4067 _nfs4_proc_pathconf(server, fhandle, pathconf),
4068 &exception);
4069 } while (exception.retry);
4070 return err;
4071}
4072
4073int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4074 const struct nfs_open_context *ctx,
4075 const struct nfs_lock_context *l_ctx,
4076 fmode_t fmode)
4077{
4078 const struct nfs_lockowner *lockowner = NULL;
4079
4080 if (l_ctx != NULL)
4081 lockowner = &l_ctx->lockowner;
4082 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4083}
4084EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4085
4086static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4087 const struct nfs_open_context *ctx,
4088 const struct nfs_lock_context *l_ctx,
4089 fmode_t fmode)
4090{
4091 nfs4_stateid current_stateid;
4092
4093 /* If the current stateid represents a lost lock, then exit */
4094 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4095 return true;
4096 return nfs4_stateid_match(stateid, &current_stateid);
4097}
4098
4099static bool nfs4_error_stateid_expired(int err)
4100{
4101 switch (err) {
4102 case -NFS4ERR_DELEG_REVOKED:
4103 case -NFS4ERR_ADMIN_REVOKED:
4104 case -NFS4ERR_BAD_STATEID:
4105 case -NFS4ERR_STALE_STATEID:
4106 case -NFS4ERR_OLD_STATEID:
4107 case -NFS4ERR_OPENMODE:
4108 case -NFS4ERR_EXPIRED:
4109 return true;
4110 }
4111 return false;
4112}
4113
4114void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4115{
4116 nfs_invalidate_atime(hdr->inode);
4117}
4118
4119static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4120{
4121 struct nfs_server *server = NFS_SERVER(hdr->inode);
4122
4123 trace_nfs4_read(hdr, task->tk_status);
4124 if (nfs4_async_handle_error(task, server,
4125 hdr->args.context->state,
4126 NULL) == -EAGAIN) {
4127 rpc_restart_call_prepare(task);
4128 return -EAGAIN;
4129 }
4130
4131 __nfs4_read_done_cb(hdr);
4132 if (task->tk_status > 0)
4133 renew_lease(server, hdr->timestamp);
4134 return 0;
4135}
4136
4137static bool nfs4_read_stateid_changed(struct rpc_task *task,
4138 struct nfs_pgio_args *args)
4139{
4140
4141 if (!nfs4_error_stateid_expired(task->tk_status) ||
4142 nfs4_stateid_is_current(&args->stateid,
4143 args->context,
4144 args->lock_context,
4145 FMODE_READ))
4146 return false;
4147 rpc_restart_call_prepare(task);
4148 return true;
4149}
4150
4151static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4152{
4153
4154 dprintk("--> %s\n", __func__);
4155
4156 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4157 return -EAGAIN;
4158 if (nfs4_read_stateid_changed(task, &hdr->args))
4159 return -EAGAIN;
4160 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4161 nfs4_read_done_cb(task, hdr);
4162}
4163
4164static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4165 struct rpc_message *msg)
4166{
4167 hdr->timestamp = jiffies;
4168 hdr->pgio_done_cb = nfs4_read_done_cb;
4169 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4170 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4171}
4172
4173static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4174 struct nfs_pgio_header *hdr)
4175{
4176 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4177 &hdr->args.seq_args,
4178 &hdr->res.seq_res,
4179 task))
4180 return 0;
4181 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4182 hdr->args.lock_context,
4183 hdr->rw_ops->rw_mode) == -EIO)
4184 return -EIO;
4185 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4186 return -EIO;
4187 return 0;
4188}
4189
4190static int nfs4_write_done_cb(struct rpc_task *task,
4191 struct nfs_pgio_header *hdr)
4192{
4193 struct inode *inode = hdr->inode;
4194
4195 trace_nfs4_write(hdr, task->tk_status);
4196 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4197 hdr->args.context->state,
4198 NULL) == -EAGAIN) {
4199 rpc_restart_call_prepare(task);
4200 return -EAGAIN;
4201 }
4202 if (task->tk_status >= 0) {
4203 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4204 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4205 }
4206 return 0;
4207}
4208
4209static bool nfs4_write_stateid_changed(struct rpc_task *task,
4210 struct nfs_pgio_args *args)
4211{
4212
4213 if (!nfs4_error_stateid_expired(task->tk_status) ||
4214 nfs4_stateid_is_current(&args->stateid,
4215 args->context,
4216 args->lock_context,
4217 FMODE_WRITE))
4218 return false;
4219 rpc_restart_call_prepare(task);
4220 return true;
4221}
4222
4223static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4224{
4225 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4226 return -EAGAIN;
4227 if (nfs4_write_stateid_changed(task, &hdr->args))
4228 return -EAGAIN;
4229 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4230 nfs4_write_done_cb(task, hdr);
4231}
4232
4233static
4234bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4235{
4236 /* Don't request attributes for pNFS or O_DIRECT writes */
4237 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4238 return false;
4239 /* Otherwise, request attributes if and only if we don't hold
4240 * a delegation
4241 */
4242 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4243}
4244
4245static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4246 struct rpc_message *msg)
4247{
4248 struct nfs_server *server = NFS_SERVER(hdr->inode);
4249
4250 if (!nfs4_write_need_cache_consistency_data(hdr)) {
4251 hdr->args.bitmask = NULL;
4252 hdr->res.fattr = NULL;
4253 } else
4254 hdr->args.bitmask = server->cache_consistency_bitmask;
4255
4256 if (!hdr->pgio_done_cb)
4257 hdr->pgio_done_cb = nfs4_write_done_cb;
4258 hdr->res.server = server;
4259 hdr->timestamp = jiffies;
4260
4261 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4262 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4263}
4264
4265static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4266{
4267 nfs4_setup_sequence(NFS_SERVER(data->inode),
4268 &data->args.seq_args,
4269 &data->res.seq_res,
4270 task);
4271}
4272
4273static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4274{
4275 struct inode *inode = data->inode;
4276
4277 trace_nfs4_commit(data, task->tk_status);
4278 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4279 NULL, NULL) == -EAGAIN) {
4280 rpc_restart_call_prepare(task);
4281 return -EAGAIN;
4282 }
4283 return 0;
4284}
4285
4286static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4287{
4288 if (!nfs4_sequence_done(task, &data->res.seq_res))
4289 return -EAGAIN;
4290 return data->commit_done_cb(task, data);
4291}
4292
4293static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4294{
4295 struct nfs_server *server = NFS_SERVER(data->inode);
4296
4297 if (data->commit_done_cb == NULL)
4298 data->commit_done_cb = nfs4_commit_done_cb;
4299 data->res.server = server;
4300 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4301 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4302}
4303
4304struct nfs4_renewdata {
4305 struct nfs_client *client;
4306 unsigned long timestamp;
4307};
4308
4309/*
4310 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4311 * standalone procedure for queueing an asynchronous RENEW.
4312 */
4313static void nfs4_renew_release(void *calldata)
4314{
4315 struct nfs4_renewdata *data = calldata;
4316 struct nfs_client *clp = data->client;
4317
4318 if (atomic_read(&clp->cl_count) > 1)
4319 nfs4_schedule_state_renewal(clp);
4320 nfs_put_client(clp);
4321 kfree(data);
4322}
4323
4324static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4325{
4326 struct nfs4_renewdata *data = calldata;
4327 struct nfs_client *clp = data->client;
4328 unsigned long timestamp = data->timestamp;
4329
4330 trace_nfs4_renew_async(clp, task->tk_status);
4331 switch (task->tk_status) {
4332 case 0:
4333 break;
4334 case -NFS4ERR_LEASE_MOVED:
4335 nfs4_schedule_lease_moved_recovery(clp);
4336 break;
4337 default:
4338 /* Unless we're shutting down, schedule state recovery! */
4339 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4340 return;
4341 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4342 nfs4_schedule_lease_recovery(clp);
4343 return;
4344 }
4345 nfs4_schedule_path_down_recovery(clp);
4346 }
4347 do_renew_lease(clp, timestamp);
4348}
4349
4350static const struct rpc_call_ops nfs4_renew_ops = {
4351 .rpc_call_done = nfs4_renew_done,
4352 .rpc_release = nfs4_renew_release,
4353};
4354
4355static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4356{
4357 struct rpc_message msg = {
4358 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4359 .rpc_argp = clp,
4360 .rpc_cred = cred,
4361 };
4362 struct nfs4_renewdata *data;
4363
4364 if (renew_flags == 0)
4365 return 0;
4366 if (!atomic_inc_not_zero(&clp->cl_count))
4367 return -EIO;
4368 data = kmalloc(sizeof(*data), GFP_NOFS);
4369 if (data == NULL)
4370 return -ENOMEM;
4371 data->client = clp;
4372 data->timestamp = jiffies;
4373 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4374 &nfs4_renew_ops, data);
4375}
4376
4377static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4378{
4379 struct rpc_message msg = {
4380 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4381 .rpc_argp = clp,
4382 .rpc_cred = cred,
4383 };
4384 unsigned long now = jiffies;
4385 int status;
4386
4387 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4388 if (status < 0)
4389 return status;
4390 do_renew_lease(clp, now);
4391 return 0;
4392}
4393
4394static inline int nfs4_server_supports_acls(struct nfs_server *server)
4395{
4396 return server->caps & NFS_CAP_ACLS;
4397}
4398
4399/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4400 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4401 * the stack.
4402 */
4403#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4404
4405static int buf_to_pages_noslab(const void *buf, size_t buflen,
4406 struct page **pages, unsigned int *pgbase)
4407{
4408 struct page *newpage, **spages;
4409 int rc = 0;
4410 size_t len;
4411 spages = pages;
4412
4413 do {
4414 len = min_t(size_t, PAGE_SIZE, buflen);
4415 newpage = alloc_page(GFP_KERNEL);
4416
4417 if (newpage == NULL)
4418 goto unwind;
4419 memcpy(page_address(newpage), buf, len);
4420 buf += len;
4421 buflen -= len;
4422 *pages++ = newpage;
4423 rc++;
4424 } while (buflen != 0);
4425
4426 return rc;
4427
4428unwind:
4429 for(; rc > 0; rc--)
4430 __free_page(spages[rc-1]);
4431 return -ENOMEM;
4432}
4433
4434struct nfs4_cached_acl {
4435 int cached;
4436 size_t len;
4437 char data[0];
4438};
4439
4440static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4441{
4442 struct nfs_inode *nfsi = NFS_I(inode);
4443
4444 spin_lock(&inode->i_lock);
4445 kfree(nfsi->nfs4_acl);
4446 nfsi->nfs4_acl = acl;
4447 spin_unlock(&inode->i_lock);
4448}
4449
4450static void nfs4_zap_acl_attr(struct inode *inode)
4451{
4452 nfs4_set_cached_acl(inode, NULL);
4453}
4454
4455static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4456{
4457 struct nfs_inode *nfsi = NFS_I(inode);
4458 struct nfs4_cached_acl *acl;
4459 int ret = -ENOENT;
4460
4461 spin_lock(&inode->i_lock);
4462 acl = nfsi->nfs4_acl;
4463 if (acl == NULL)
4464 goto out;
4465 if (buf == NULL) /* user is just asking for length */
4466 goto out_len;
4467 if (acl->cached == 0)
4468 goto out;
4469 ret = -ERANGE; /* see getxattr(2) man page */
4470 if (acl->len > buflen)
4471 goto out;
4472 memcpy(buf, acl->data, acl->len);
4473out_len:
4474 ret = acl->len;
4475out:
4476 spin_unlock(&inode->i_lock);
4477 return ret;
4478}
4479
4480static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4481{
4482 struct nfs4_cached_acl *acl;
4483 size_t buflen = sizeof(*acl) + acl_len;
4484
4485 if (buflen <= PAGE_SIZE) {
4486 acl = kmalloc(buflen, GFP_KERNEL);
4487 if (acl == NULL)
4488 goto out;
4489 acl->cached = 1;
4490 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4491 } else {
4492 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4493 if (acl == NULL)
4494 goto out;
4495 acl->cached = 0;
4496 }
4497 acl->len = acl_len;
4498out:
4499 nfs4_set_cached_acl(inode, acl);
4500}
4501
4502/*
4503 * The getxattr API returns the required buffer length when called with a
4504 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4505 * the required buf. On a NULL buf, we send a page of data to the server
4506 * guessing that the ACL request can be serviced by a page. If so, we cache
4507 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4508 * the cache. If not so, we throw away the page, and cache the required
4509 * length. The next getxattr call will then produce another round trip to
4510 * the server, this time with the input buf of the required size.
4511 */
4512static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4513{
4514 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4515 struct nfs_getaclargs args = {
4516 .fh = NFS_FH(inode),
4517 .acl_pages = pages,
4518 .acl_len = buflen,
4519 };
4520 struct nfs_getaclres res = {
4521 .acl_len = buflen,
4522 };
4523 struct rpc_message msg = {
4524 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4525 .rpc_argp = &args,
4526 .rpc_resp = &res,
4527 };
4528 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4529 int ret = -ENOMEM, i;
4530
4531 /* As long as we're doing a round trip to the server anyway,
4532 * let's be prepared for a page of acl data. */
4533 if (npages == 0)
4534 npages = 1;
4535 if (npages > ARRAY_SIZE(pages))
4536 return -ERANGE;
4537
4538 for (i = 0; i < npages; i++) {
4539 pages[i] = alloc_page(GFP_KERNEL);
4540 if (!pages[i])
4541 goto out_free;
4542 }
4543
4544 /* for decoding across pages */
4545 res.acl_scratch = alloc_page(GFP_KERNEL);
4546 if (!res.acl_scratch)
4547 goto out_free;
4548
4549 args.acl_len = npages * PAGE_SIZE;
4550 args.acl_pgbase = 0;
4551
4552 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4553 __func__, buf, buflen, npages, args.acl_len);
4554 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4555 &msg, &args.seq_args, &res.seq_res, 0);
4556 if (ret)
4557 goto out_free;
4558
4559 /* Handle the case where the passed-in buffer is too short */
4560 if (res.acl_flags & NFS4_ACL_TRUNC) {
4561 /* Did the user only issue a request for the acl length? */
4562 if (buf == NULL)
4563 goto out_ok;
4564 ret = -ERANGE;
4565 goto out_free;
4566 }
4567 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4568 if (buf) {
4569 if (res.acl_len > buflen) {
4570 ret = -ERANGE;
4571 goto out_free;
4572 }
4573 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4574 }
4575out_ok:
4576 ret = res.acl_len;
4577out_free:
4578 for (i = 0; i < npages; i++)
4579 if (pages[i])
4580 __free_page(pages[i]);
4581 if (res.acl_scratch)
4582 __free_page(res.acl_scratch);
4583 return ret;
4584}
4585
4586static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4587{
4588 struct nfs4_exception exception = { };
4589 ssize_t ret;
4590 do {
4591 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4592 trace_nfs4_get_acl(inode, ret);
4593 if (ret >= 0)
4594 break;
4595 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4596 } while (exception.retry);
4597 return ret;
4598}
4599
4600static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4601{
4602 struct nfs_server *server = NFS_SERVER(inode);
4603 int ret;
4604
4605 if (!nfs4_server_supports_acls(server))
4606 return -EOPNOTSUPP;
4607 ret = nfs_revalidate_inode(server, inode);
4608 if (ret < 0)
4609 return ret;
4610 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4611 nfs_zap_acl_cache(inode);
4612 ret = nfs4_read_cached_acl(inode, buf, buflen);
4613 if (ret != -ENOENT)
4614 /* -ENOENT is returned if there is no ACL or if there is an ACL
4615 * but no cached acl data, just the acl length */
4616 return ret;
4617 return nfs4_get_acl_uncached(inode, buf, buflen);
4618}
4619
4620static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4621{
4622 struct nfs_server *server = NFS_SERVER(inode);
4623 struct page *pages[NFS4ACL_MAXPAGES];
4624 struct nfs_setaclargs arg = {
4625 .fh = NFS_FH(inode),
4626 .acl_pages = pages,
4627 .acl_len = buflen,
4628 };
4629 struct nfs_setaclres res;
4630 struct rpc_message msg = {
4631 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4632 .rpc_argp = &arg,
4633 .rpc_resp = &res,
4634 };
4635 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4636 int ret, i;
4637
4638 if (!nfs4_server_supports_acls(server))
4639 return -EOPNOTSUPP;
4640 if (npages > ARRAY_SIZE(pages))
4641 return -ERANGE;
4642 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4643 if (i < 0)
4644 return i;
4645 nfs4_inode_return_delegation(inode);
4646 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4647
4648 /*
4649 * Free each page after tx, so the only ref left is
4650 * held by the network stack
4651 */
4652 for (; i > 0; i--)
4653 put_page(pages[i-1]);
4654
4655 /*
4656 * Acl update can result in inode attribute update.
4657 * so mark the attribute cache invalid.
4658 */
4659 spin_lock(&inode->i_lock);
4660 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4661 spin_unlock(&inode->i_lock);
4662 nfs_access_zap_cache(inode);
4663 nfs_zap_acl_cache(inode);
4664 return ret;
4665}
4666
4667static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4668{
4669 struct nfs4_exception exception = { };
4670 int err;
4671 do {
4672 err = __nfs4_proc_set_acl(inode, buf, buflen);
4673 trace_nfs4_set_acl(inode, err);
4674 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4675 &exception);
4676 } while (exception.retry);
4677 return err;
4678}
4679
4680#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4681static int _nfs4_get_security_label(struct inode *inode, void *buf,
4682 size_t buflen)
4683{
4684 struct nfs_server *server = NFS_SERVER(inode);
4685 struct nfs_fattr fattr;
4686 struct nfs4_label label = {0, 0, buflen, buf};
4687
4688 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4689 struct nfs4_getattr_arg arg = {
4690 .fh = NFS_FH(inode),
4691 .bitmask = bitmask,
4692 };
4693 struct nfs4_getattr_res res = {
4694 .fattr = &fattr,
4695 .label = &label,
4696 .server = server,
4697 };
4698 struct rpc_message msg = {
4699 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4700 .rpc_argp = &arg,
4701 .rpc_resp = &res,
4702 };
4703 int ret;
4704
4705 nfs_fattr_init(&fattr);
4706
4707 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4708 if (ret)
4709 return ret;
4710 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4711 return -ENOENT;
4712 if (buflen < label.len)
4713 return -ERANGE;
4714 return 0;
4715}
4716
4717static int nfs4_get_security_label(struct inode *inode, void *buf,
4718 size_t buflen)
4719{
4720 struct nfs4_exception exception = { };
4721 int err;
4722
4723 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4724 return -EOPNOTSUPP;
4725
4726 do {
4727 err = _nfs4_get_security_label(inode, buf, buflen);
4728 trace_nfs4_get_security_label(inode, err);
4729 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4730 &exception);
4731 } while (exception.retry);
4732 return err;
4733}
4734
4735static int _nfs4_do_set_security_label(struct inode *inode,
4736 struct nfs4_label *ilabel,
4737 struct nfs_fattr *fattr,
4738 struct nfs4_label *olabel)
4739{
4740
4741 struct iattr sattr = {0};
4742 struct nfs_server *server = NFS_SERVER(inode);
4743 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4744 struct nfs_setattrargs arg = {
4745 .fh = NFS_FH(inode),
4746 .iap = &sattr,
4747 .server = server,
4748 .bitmask = bitmask,
4749 .label = ilabel,
4750 };
4751 struct nfs_setattrres res = {
4752 .fattr = fattr,
4753 .label = olabel,
4754 .server = server,
4755 };
4756 struct rpc_message msg = {
4757 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4758 .rpc_argp = &arg,
4759 .rpc_resp = &res,
4760 };
4761 int status;
4762
4763 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4764
4765 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4766 if (status)
4767 dprintk("%s failed: %d\n", __func__, status);
4768
4769 return status;
4770}
4771
4772static int nfs4_do_set_security_label(struct inode *inode,
4773 struct nfs4_label *ilabel,
4774 struct nfs_fattr *fattr,
4775 struct nfs4_label *olabel)
4776{
4777 struct nfs4_exception exception = { };
4778 int err;
4779
4780 do {
4781 err = _nfs4_do_set_security_label(inode, ilabel,
4782 fattr, olabel);
4783 trace_nfs4_set_security_label(inode, err);
4784 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4785 &exception);
4786 } while (exception.retry);
4787 return err;
4788}
4789
4790static int
4791nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4792{
4793 struct nfs4_label ilabel, *olabel = NULL;
4794 struct nfs_fattr fattr;
4795 struct rpc_cred *cred;
4796 struct inode *inode = dentry->d_inode;
4797 int status;
4798
4799 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4800 return -EOPNOTSUPP;
4801
4802 nfs_fattr_init(&fattr);
4803
4804 ilabel.pi = 0;
4805 ilabel.lfs = 0;
4806 ilabel.label = (char *)buf;
4807 ilabel.len = buflen;
4808
4809 cred = rpc_lookup_cred();
4810 if (IS_ERR(cred))
4811 return PTR_ERR(cred);
4812
4813 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4814 if (IS_ERR(olabel)) {
4815 status = -PTR_ERR(olabel);
4816 goto out;
4817 }
4818
4819 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4820 if (status == 0)
4821 nfs_setsecurity(inode, &fattr, olabel);
4822
4823 nfs4_label_free(olabel);
4824out:
4825 put_rpccred(cred);
4826 return status;
4827}
4828#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4829
4830
4831static int
4832nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4833 struct nfs4_state *state, long *timeout)
4834{
4835 struct nfs_client *clp = server->nfs_client;
4836
4837 if (task->tk_status >= 0)
4838 return 0;
4839 switch(task->tk_status) {
4840 case -NFS4ERR_DELEG_REVOKED:
4841 case -NFS4ERR_ADMIN_REVOKED:
4842 case -NFS4ERR_BAD_STATEID:
4843 case -NFS4ERR_OPENMODE:
4844 if (state == NULL)
4845 break;
4846 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4847 goto recovery_failed;
4848 goto wait_on_recovery;
4849 case -NFS4ERR_EXPIRED:
4850 if (state != NULL) {
4851 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4852 goto recovery_failed;
4853 }
4854 case -NFS4ERR_STALE_STATEID:
4855 case -NFS4ERR_STALE_CLIENTID:
4856 nfs4_schedule_lease_recovery(clp);
4857 goto wait_on_recovery;
4858 case -NFS4ERR_MOVED:
4859 if (nfs4_schedule_migration_recovery(server) < 0)
4860 goto recovery_failed;
4861 goto wait_on_recovery;
4862 case -NFS4ERR_LEASE_MOVED:
4863 nfs4_schedule_lease_moved_recovery(clp);
4864 goto wait_on_recovery;
4865#if defined(CONFIG_NFS_V4_1)
4866 case -NFS4ERR_BADSESSION:
4867 case -NFS4ERR_BADSLOT:
4868 case -NFS4ERR_BAD_HIGH_SLOT:
4869 case -NFS4ERR_DEADSESSION:
4870 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4871 case -NFS4ERR_SEQ_FALSE_RETRY:
4872 case -NFS4ERR_SEQ_MISORDERED:
4873 dprintk("%s ERROR %d, Reset session\n", __func__,
4874 task->tk_status);
4875 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4876 goto wait_on_recovery;
4877#endif /* CONFIG_NFS_V4_1 */
4878 case -NFS4ERR_DELAY:
4879 nfs_inc_server_stats(server, NFSIOS_DELAY);
4880 rpc_delay(task, nfs4_update_delay(timeout));
4881 goto restart_call;
4882 case -NFS4ERR_GRACE:
4883 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4884 case -NFS4ERR_RETRY_UNCACHED_REP:
4885 case -NFS4ERR_OLD_STATEID:
4886 goto restart_call;
4887 }
4888 task->tk_status = nfs4_map_errors(task->tk_status);
4889 return 0;
4890recovery_failed:
4891 task->tk_status = -EIO;
4892 return 0;
4893wait_on_recovery:
4894 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4895 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4896 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4897 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4898 goto recovery_failed;
4899restart_call:
4900 task->tk_status = 0;
4901 return -EAGAIN;
4902}
4903
4904static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4905 nfs4_verifier *bootverf)
4906{
4907 __be32 verf[2];
4908
4909 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4910 /* An impossible timestamp guarantees this value
4911 * will never match a generated boot time. */
4912 verf[0] = 0;
4913 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4914 } else {
4915 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4916 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4917 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4918 }
4919 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4920}
4921
4922static unsigned int
4923nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4924 char *buf, size_t len)
4925{
4926 unsigned int result;
4927
4928 if (clp->cl_owner_id != NULL)
4929 return strlcpy(buf, clp->cl_owner_id, len);
4930
4931 rcu_read_lock();
4932 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4933 clp->cl_ipaddr,
4934 rpc_peeraddr2str(clp->cl_rpcclient,
4935 RPC_DISPLAY_ADDR),
4936 rpc_peeraddr2str(clp->cl_rpcclient,
4937 RPC_DISPLAY_PROTO));
4938 rcu_read_unlock();
4939 clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4940 return result;
4941}
4942
4943static unsigned int
4944nfs4_init_uniform_client_string(struct nfs_client *clp,
4945 char *buf, size_t len)
4946{
4947 const char *nodename = clp->cl_rpcclient->cl_nodename;
4948 unsigned int result;
4949
4950 if (clp->cl_owner_id != NULL)
4951 return strlcpy(buf, clp->cl_owner_id, len);
4952
4953 if (nfs4_client_id_uniquifier[0] != '\0')
4954 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4955 clp->rpc_ops->version,
4956 clp->cl_minorversion,
4957 nfs4_client_id_uniquifier,
4958 nodename);
4959 else
4960 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4961 clp->rpc_ops->version, clp->cl_minorversion,
4962 nodename);
4963 clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4964 return result;
4965}
4966
4967/*
4968 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4969 * services. Advertise one based on the address family of the
4970 * clientaddr.
4971 */
4972static unsigned int
4973nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4974{
4975 if (strchr(clp->cl_ipaddr, ':') != NULL)
4976 return scnprintf(buf, len, "tcp6");
4977 else
4978 return scnprintf(buf, len, "tcp");
4979}
4980
4981static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4982{
4983 struct nfs4_setclientid *sc = calldata;
4984
4985 if (task->tk_status == 0)
4986 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4987}
4988
4989static const struct rpc_call_ops nfs4_setclientid_ops = {
4990 .rpc_call_done = nfs4_setclientid_done,
4991};
4992
4993/**
4994 * nfs4_proc_setclientid - Negotiate client ID
4995 * @clp: state data structure
4996 * @program: RPC program for NFSv4 callback service
4997 * @port: IP port number for NFS4 callback service
4998 * @cred: RPC credential to use for this call
4999 * @res: where to place the result
5000 *
5001 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5002 */
5003int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5004 unsigned short port, struct rpc_cred *cred,
5005 struct nfs4_setclientid_res *res)
5006{
5007 nfs4_verifier sc_verifier;
5008 struct nfs4_setclientid setclientid = {
5009 .sc_verifier = &sc_verifier,
5010 .sc_prog = program,
5011 .sc_cb_ident = clp->cl_cb_ident,
5012 };
5013 struct rpc_message msg = {
5014 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5015 .rpc_argp = &setclientid,
5016 .rpc_resp = res,
5017 .rpc_cred = cred,
5018 };
5019 struct rpc_task *task;
5020 struct rpc_task_setup task_setup_data = {
5021 .rpc_client = clp->cl_rpcclient,
5022 .rpc_message = &msg,
5023 .callback_ops = &nfs4_setclientid_ops,
5024 .callback_data = &setclientid,
5025 .flags = RPC_TASK_TIMEOUT,
5026 };
5027 int status;
5028
5029 /* nfs_client_id4 */
5030 nfs4_init_boot_verifier(clp, &sc_verifier);
5031 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5032 setclientid.sc_name_len =
5033 nfs4_init_uniform_client_string(clp,
5034 setclientid.sc_name,
5035 sizeof(setclientid.sc_name));
5036 else
5037 setclientid.sc_name_len =
5038 nfs4_init_nonuniform_client_string(clp,
5039 setclientid.sc_name,
5040 sizeof(setclientid.sc_name));
5041 /* cb_client4 */
5042 setclientid.sc_netid_len =
5043 nfs4_init_callback_netid(clp,
5044 setclientid.sc_netid,
5045 sizeof(setclientid.sc_netid));
5046 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5047 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5048 clp->cl_ipaddr, port >> 8, port & 255);
5049
5050 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
5051 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5052 setclientid.sc_name_len, setclientid.sc_name);
5053 task = rpc_run_task(&task_setup_data);
5054 if (IS_ERR(task)) {
5055 status = PTR_ERR(task);
5056 goto out;
5057 }
5058 status = task->tk_status;
5059 if (setclientid.sc_cred) {
5060 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5061 put_rpccred(setclientid.sc_cred);
5062 }
5063 rpc_put_task(task);
5064out:
5065 trace_nfs4_setclientid(clp, status);
5066 dprintk("NFS reply setclientid: %d\n", status);
5067 return status;
5068}
5069
5070/**
5071 * nfs4_proc_setclientid_confirm - Confirm client ID
5072 * @clp: state data structure
5073 * @res: result of a previous SETCLIENTID
5074 * @cred: RPC credential to use for this call
5075 *
5076 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5077 */
5078int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5079 struct nfs4_setclientid_res *arg,
5080 struct rpc_cred *cred)
5081{
5082 struct rpc_message msg = {
5083 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5084 .rpc_argp = arg,
5085 .rpc_cred = cred,
5086 };
5087 int status;
5088
5089 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
5090 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5091 clp->cl_clientid);
5092 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5093 trace_nfs4_setclientid_confirm(clp, status);
5094 dprintk("NFS reply setclientid_confirm: %d\n", status);
5095 return status;
5096}
5097
5098struct nfs4_delegreturndata {
5099 struct nfs4_delegreturnargs args;
5100 struct nfs4_delegreturnres res;
5101 struct nfs_fh fh;
5102 nfs4_stateid stateid;
5103 unsigned long timestamp;
5104 struct nfs_fattr fattr;
5105 int rpc_status;
5106 struct inode *inode;
5107 bool roc;
5108 u32 roc_barrier;
5109};
5110
5111static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5112{
5113 struct nfs4_delegreturndata *data = calldata;
5114
5115 if (!nfs4_sequence_done(task, &data->res.seq_res))
5116 return;
5117
5118 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5119 switch (task->tk_status) {
5120 case 0:
5121 renew_lease(data->res.server, data->timestamp);
5122 case -NFS4ERR_ADMIN_REVOKED:
5123 case -NFS4ERR_DELEG_REVOKED:
5124 case -NFS4ERR_BAD_STATEID:
5125 case -NFS4ERR_OLD_STATEID:
5126 case -NFS4ERR_STALE_STATEID:
5127 case -NFS4ERR_EXPIRED:
5128 task->tk_status = 0;
5129 if (data->roc)
5130 pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5131 break;
5132 default:
5133 if (nfs4_async_handle_error(task, data->res.server,
5134 NULL, NULL) == -EAGAIN) {
5135 rpc_restart_call_prepare(task);
5136 return;
5137 }
5138 }
5139 data->rpc_status = task->tk_status;
5140}
5141
5142static void nfs4_delegreturn_release(void *calldata)
5143{
5144 struct nfs4_delegreturndata *data = calldata;
5145
5146 if (data->roc)
5147 pnfs_roc_release(data->inode);
5148 kfree(calldata);
5149}
5150
5151static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5152{
5153 struct nfs4_delegreturndata *d_data;
5154
5155 d_data = (struct nfs4_delegreturndata *)data;
5156
5157 if (d_data->roc &&
5158 pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5159 return;
5160
5161 nfs4_setup_sequence(d_data->res.server,
5162 &d_data->args.seq_args,
5163 &d_data->res.seq_res,
5164 task);
5165}
5166
5167static const struct rpc_call_ops nfs4_delegreturn_ops = {
5168 .rpc_call_prepare = nfs4_delegreturn_prepare,
5169 .rpc_call_done = nfs4_delegreturn_done,
5170 .rpc_release = nfs4_delegreturn_release,
5171};
5172
5173static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5174{
5175 struct nfs4_delegreturndata *data;
5176 struct nfs_server *server = NFS_SERVER(inode);
5177 struct rpc_task *task;
5178 struct rpc_message msg = {
5179 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5180 .rpc_cred = cred,
5181 };
5182 struct rpc_task_setup task_setup_data = {
5183 .rpc_client = server->client,
5184 .rpc_message = &msg,
5185 .callback_ops = &nfs4_delegreturn_ops,
5186 .flags = RPC_TASK_ASYNC,
5187 };
5188 int status = 0;
5189
5190 data = kzalloc(sizeof(*data), GFP_NOFS);
5191 if (data == NULL)
5192 return -ENOMEM;
5193 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5194 data->args.fhandle = &data->fh;
5195 data->args.stateid = &data->stateid;
5196 data->args.bitmask = server->cache_consistency_bitmask;
5197 nfs_copy_fh(&data->fh, NFS_FH(inode));
5198 nfs4_stateid_copy(&data->stateid, stateid);
5199 data->res.fattr = &data->fattr;
5200 data->res.server = server;
5201 nfs_fattr_init(data->res.fattr);
5202 data->timestamp = jiffies;
5203 data->rpc_status = 0;
5204 data->inode = inode;
5205 data->roc = list_empty(&NFS_I(inode)->open_files) ?
5206 pnfs_roc(inode) : false;
5207
5208 task_setup_data.callback_data = data;
5209 msg.rpc_argp = &data->args;
5210 msg.rpc_resp = &data->res;
5211 task = rpc_run_task(&task_setup_data);
5212 if (IS_ERR(task))
5213 return PTR_ERR(task);
5214 if (!issync)
5215 goto out;
5216 status = nfs4_wait_for_completion_rpc_task(task);
5217 if (status != 0)
5218 goto out;
5219 status = data->rpc_status;
5220 if (status == 0)
5221 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5222 else
5223 nfs_refresh_inode(inode, &data->fattr);
5224out:
5225 rpc_put_task(task);
5226 return status;
5227}
5228
5229int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5230{
5231 struct nfs_server *server = NFS_SERVER(inode);
5232 struct nfs4_exception exception = { };
5233 int err;
5234 do {
5235 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5236 trace_nfs4_delegreturn(inode, err);
5237 switch (err) {
5238 case -NFS4ERR_STALE_STATEID:
5239 case -NFS4ERR_EXPIRED:
5240 case 0:
5241 return 0;
5242 }
5243 err = nfs4_handle_exception(server, err, &exception);
5244 } while (exception.retry);
5245 return err;
5246}
5247
5248#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5249#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5250
5251/*
5252 * sleep, with exponential backoff, and retry the LOCK operation.
5253 */
5254static unsigned long
5255nfs4_set_lock_task_retry(unsigned long timeout)
5256{
5257 freezable_schedule_timeout_killable_unsafe(timeout);
5258 timeout <<= 1;
5259 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5260 return NFS4_LOCK_MAXTIMEOUT;
5261 return timeout;
5262}
5263
5264static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5265{
5266 struct inode *inode = state->inode;
5267 struct nfs_server *server = NFS_SERVER(inode);
5268 struct nfs_client *clp = server->nfs_client;
5269 struct nfs_lockt_args arg = {
5270 .fh = NFS_FH(inode),
5271 .fl = request,
5272 };
5273 struct nfs_lockt_res res = {
5274 .denied = request,
5275 };
5276 struct rpc_message msg = {
5277 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5278 .rpc_argp = &arg,
5279 .rpc_resp = &res,
5280 .rpc_cred = state->owner->so_cred,
5281 };
5282 struct nfs4_lock_state *lsp;
5283 int status;
5284
5285 arg.lock_owner.clientid = clp->cl_clientid;
5286 status = nfs4_set_lock_state(state, request);
5287 if (status != 0)
5288 goto out;
5289 lsp = request->fl_u.nfs4_fl.owner;
5290 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5291 arg.lock_owner.s_dev = server->s_dev;
5292 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5293 switch (status) {
5294 case 0:
5295 request->fl_type = F_UNLCK;
5296 break;
5297 case -NFS4ERR_DENIED:
5298 status = 0;
5299 }
5300 request->fl_ops->fl_release_private(request);
5301 request->fl_ops = NULL;
5302out:
5303 return status;
5304}
5305
5306static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5307{
5308 struct nfs4_exception exception = { };
5309 int err;
5310
5311 do {
5312 err = _nfs4_proc_getlk(state, cmd, request);
5313 trace_nfs4_get_lock(request, state, cmd, err);
5314 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5315 &exception);
5316 } while (exception.retry);
5317 return err;
5318}
5319
5320static int do_vfs_lock(struct file *file, struct file_lock *fl)
5321{
5322 int res = 0;
5323 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5324 case FL_POSIX:
5325 res = posix_lock_file_wait(file, fl);
5326 break;
5327 case FL_FLOCK:
5328 res = flock_lock_file_wait(file, fl);
5329 break;
5330 default:
5331 BUG();
5332 }
5333 return res;
5334}
5335
5336struct nfs4_unlockdata {
5337 struct nfs_locku_args arg;
5338 struct nfs_locku_res res;
5339 struct nfs4_lock_state *lsp;
5340 struct nfs_open_context *ctx;
5341 struct file_lock fl;
5342 const struct nfs_server *server;
5343 unsigned long timestamp;
5344};
5345
5346static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5347 struct nfs_open_context *ctx,
5348 struct nfs4_lock_state *lsp,
5349 struct nfs_seqid *seqid)
5350{
5351 struct nfs4_unlockdata *p;
5352 struct inode *inode = lsp->ls_state->inode;
5353
5354 p = kzalloc(sizeof(*p), GFP_NOFS);
5355 if (p == NULL)
5356 return NULL;
5357 p->arg.fh = NFS_FH(inode);
5358 p->arg.fl = &p->fl;
5359 p->arg.seqid = seqid;
5360 p->res.seqid = seqid;
5361 p->arg.stateid = &lsp->ls_stateid;
5362 p->lsp = lsp;
5363 atomic_inc(&lsp->ls_count);
5364 /* Ensure we don't close file until we're done freeing locks! */
5365 p->ctx = get_nfs_open_context(ctx);
5366 memcpy(&p->fl, fl, sizeof(p->fl));
5367 p->server = NFS_SERVER(inode);
5368 return p;
5369}
5370
5371static void nfs4_locku_release_calldata(void *data)
5372{
5373 struct nfs4_unlockdata *calldata = data;
5374 nfs_free_seqid(calldata->arg.seqid);
5375 nfs4_put_lock_state(calldata->lsp);
5376 put_nfs_open_context(calldata->ctx);
5377 kfree(calldata);
5378}
5379
5380static void nfs4_locku_done(struct rpc_task *task, void *data)
5381{
5382 struct nfs4_unlockdata *calldata = data;
5383
5384 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5385 return;
5386 switch (task->tk_status) {
5387 case 0:
5388 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5389 &calldata->res.stateid);
5390 renew_lease(calldata->server, calldata->timestamp);
5391 break;
5392 case -NFS4ERR_BAD_STATEID:
5393 case -NFS4ERR_OLD_STATEID:
5394 case -NFS4ERR_STALE_STATEID:
5395 case -NFS4ERR_EXPIRED:
5396 break;
5397 default:
5398 if (nfs4_async_handle_error(task, calldata->server,
5399 NULL, NULL) == -EAGAIN)
5400 rpc_restart_call_prepare(task);
5401 }
5402 nfs_release_seqid(calldata->arg.seqid);
5403}
5404
5405static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5406{
5407 struct nfs4_unlockdata *calldata = data;
5408
5409 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5410 goto out_wait;
5411 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5412 /* Note: exit _without_ running nfs4_locku_done */
5413 goto out_no_action;
5414 }
5415 calldata->timestamp = jiffies;
5416 if (nfs4_setup_sequence(calldata->server,
5417 &calldata->arg.seq_args,
5418 &calldata->res.seq_res,
5419 task) != 0)
5420 nfs_release_seqid(calldata->arg.seqid);
5421 return;
5422out_no_action:
5423 task->tk_action = NULL;
5424out_wait:
5425 nfs4_sequence_done(task, &calldata->res.seq_res);
5426}
5427
5428static const struct rpc_call_ops nfs4_locku_ops = {
5429 .rpc_call_prepare = nfs4_locku_prepare,
5430 .rpc_call_done = nfs4_locku_done,
5431 .rpc_release = nfs4_locku_release_calldata,
5432};
5433
5434static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5435 struct nfs_open_context *ctx,
5436 struct nfs4_lock_state *lsp,
5437 struct nfs_seqid *seqid)
5438{
5439 struct nfs4_unlockdata *data;
5440 struct rpc_message msg = {
5441 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5442 .rpc_cred = ctx->cred,
5443 };
5444 struct rpc_task_setup task_setup_data = {
5445 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5446 .rpc_message = &msg,
5447 .callback_ops = &nfs4_locku_ops,
5448 .workqueue = nfsiod_workqueue,
5449 .flags = RPC_TASK_ASYNC,
5450 };
5451
5452 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5453 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5454
5455 /* Ensure this is an unlock - when canceling a lock, the
5456 * canceled lock is passed in, and it won't be an unlock.
5457 */
5458 fl->fl_type = F_UNLCK;
5459
5460 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5461 if (data == NULL) {
5462 nfs_free_seqid(seqid);
5463 return ERR_PTR(-ENOMEM);
5464 }
5465
5466 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5467 msg.rpc_argp = &data->arg;
5468 msg.rpc_resp = &data->res;
5469 task_setup_data.callback_data = data;
5470 return rpc_run_task(&task_setup_data);
5471}
5472
5473static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5474{
5475 struct inode *inode = state->inode;
5476 struct nfs4_state_owner *sp = state->owner;
5477 struct nfs_inode *nfsi = NFS_I(inode);
5478 struct nfs_seqid *seqid;
5479 struct nfs4_lock_state *lsp;
5480 struct rpc_task *task;
5481 int status = 0;
5482 unsigned char fl_flags = request->fl_flags;
5483
5484 status = nfs4_set_lock_state(state, request);
5485 /* Unlock _before_ we do the RPC call */
5486 request->fl_flags |= FL_EXISTS;
5487 /* Exclude nfs_delegation_claim_locks() */
5488 mutex_lock(&sp->so_delegreturn_mutex);
5489 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5490 down_read(&nfsi->rwsem);
5491 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5492 up_read(&nfsi->rwsem);
5493 mutex_unlock(&sp->so_delegreturn_mutex);
5494 goto out;
5495 }
5496 up_read(&nfsi->rwsem);
5497 mutex_unlock(&sp->so_delegreturn_mutex);
5498 if (status != 0)
5499 goto out;
5500 /* Is this a delegated lock? */
5501 lsp = request->fl_u.nfs4_fl.owner;
5502 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5503 goto out;
5504 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5505 status = -ENOMEM;
5506 if (seqid == NULL)
5507 goto out;
5508 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5509 status = PTR_ERR(task);
5510 if (IS_ERR(task))
5511 goto out;
5512 status = nfs4_wait_for_completion_rpc_task(task);
5513 rpc_put_task(task);
5514out:
5515 request->fl_flags = fl_flags;
5516 trace_nfs4_unlock(request, state, F_SETLK, status);
5517 return status;
5518}
5519
5520struct nfs4_lockdata {
5521 struct nfs_lock_args arg;
5522 struct nfs_lock_res res;
5523 struct nfs4_lock_state *lsp;
5524 struct nfs_open_context *ctx;
5525 struct file_lock fl;
5526 unsigned long timestamp;
5527 int rpc_status;
5528 int cancelled;
5529 struct nfs_server *server;
5530};
5531
5532static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5533 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5534 gfp_t gfp_mask)
5535{
5536 struct nfs4_lockdata *p;
5537 struct inode *inode = lsp->ls_state->inode;
5538 struct nfs_server *server = NFS_SERVER(inode);
5539
5540 p = kzalloc(sizeof(*p), gfp_mask);
5541 if (p == NULL)
5542 return NULL;
5543
5544 p->arg.fh = NFS_FH(inode);
5545 p->arg.fl = &p->fl;
5546 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5547 if (p->arg.open_seqid == NULL)
5548 goto out_free;
5549 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5550 if (p->arg.lock_seqid == NULL)
5551 goto out_free_seqid;
5552 p->arg.lock_stateid = &lsp->ls_stateid;
5553 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5554 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5555 p->arg.lock_owner.s_dev = server->s_dev;
5556 p->res.lock_seqid = p->arg.lock_seqid;
5557 p->lsp = lsp;
5558 p->server = server;
5559 atomic_inc(&lsp->ls_count);
5560 p->ctx = get_nfs_open_context(ctx);
5561 memcpy(&p->fl, fl, sizeof(p->fl));
5562 return p;
5563out_free_seqid:
5564 nfs_free_seqid(p->arg.open_seqid);
5565out_free:
5566 kfree(p);
5567 return NULL;
5568}
5569
5570static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5571{
5572 struct nfs4_lockdata *data = calldata;
5573 struct nfs4_state *state = data->lsp->ls_state;
5574
5575 dprintk("%s: begin!\n", __func__);
5576 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5577 goto out_wait;
5578 /* Do we need to do an open_to_lock_owner? */
5579 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5580 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5581 goto out_release_lock_seqid;
5582 }
5583 data->arg.open_stateid = &state->open_stateid;
5584 data->arg.new_lock_owner = 1;
5585 data->res.open_seqid = data->arg.open_seqid;
5586 } else
5587 data->arg.new_lock_owner = 0;
5588 if (!nfs4_valid_open_stateid(state)) {
5589 data->rpc_status = -EBADF;
5590 task->tk_action = NULL;
5591 goto out_release_open_seqid;
5592 }
5593 data->timestamp = jiffies;
5594 if (nfs4_setup_sequence(data->server,
5595 &data->arg.seq_args,
5596 &data->res.seq_res,
5597 task) == 0)
5598 return;
5599out_release_open_seqid:
5600 nfs_release_seqid(data->arg.open_seqid);
5601out_release_lock_seqid:
5602 nfs_release_seqid(data->arg.lock_seqid);
5603out_wait:
5604 nfs4_sequence_done(task, &data->res.seq_res);
5605 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5606}
5607
5608static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5609{
5610 struct nfs4_lockdata *data = calldata;
5611
5612 dprintk("%s: begin!\n", __func__);
5613
5614 if (!nfs4_sequence_done(task, &data->res.seq_res))
5615 return;
5616
5617 data->rpc_status = task->tk_status;
5618 if (data->arg.new_lock_owner != 0) {
5619 if (data->rpc_status == 0)
5620 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5621 else
5622 goto out;
5623 }
5624 if (data->rpc_status == 0) {
5625 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5626 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5627 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5628 }
5629out:
5630 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5631}
5632
5633static void nfs4_lock_release(void *calldata)
5634{
5635 struct nfs4_lockdata *data = calldata;
5636
5637 dprintk("%s: begin!\n", __func__);
5638 nfs_free_seqid(data->arg.open_seqid);
5639 if (data->cancelled != 0) {
5640 struct rpc_task *task;
5641 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5642 data->arg.lock_seqid);
5643 if (!IS_ERR(task))
5644 rpc_put_task_async(task);
5645 dprintk("%s: cancelling lock!\n", __func__);
5646 } else
5647 nfs_free_seqid(data->arg.lock_seqid);
5648 nfs4_put_lock_state(data->lsp);
5649 put_nfs_open_context(data->ctx);
5650 kfree(data);
5651 dprintk("%s: done!\n", __func__);
5652}
5653
5654static const struct rpc_call_ops nfs4_lock_ops = {
5655 .rpc_call_prepare = nfs4_lock_prepare,
5656 .rpc_call_done = nfs4_lock_done,
5657 .rpc_release = nfs4_lock_release,
5658};
5659
5660static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5661{
5662 switch (error) {
5663 case -NFS4ERR_ADMIN_REVOKED:
5664 case -NFS4ERR_BAD_STATEID:
5665 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5666 if (new_lock_owner != 0 ||
5667 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5668 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5669 break;
5670 case -NFS4ERR_STALE_STATEID:
5671 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5672 case -NFS4ERR_EXPIRED:
5673 nfs4_schedule_lease_recovery(server->nfs_client);
5674 };
5675}
5676
5677static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5678{
5679 struct nfs4_lockdata *data;
5680 struct rpc_task *task;
5681 struct rpc_message msg = {
5682 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5683 .rpc_cred = state->owner->so_cred,
5684 };
5685 struct rpc_task_setup task_setup_data = {
5686 .rpc_client = NFS_CLIENT(state->inode),
5687 .rpc_message = &msg,
5688 .callback_ops = &nfs4_lock_ops,
5689 .workqueue = nfsiod_workqueue,
5690 .flags = RPC_TASK_ASYNC,
5691 };
5692 int ret;
5693
5694 dprintk("%s: begin!\n", __func__);
5695 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5696 fl->fl_u.nfs4_fl.owner,
5697 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5698 if (data == NULL)
5699 return -ENOMEM;
5700 if (IS_SETLKW(cmd))
5701 data->arg.block = 1;
5702 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5703 msg.rpc_argp = &data->arg;
5704 msg.rpc_resp = &data->res;
5705 task_setup_data.callback_data = data;
5706 if (recovery_type > NFS_LOCK_NEW) {
5707 if (recovery_type == NFS_LOCK_RECLAIM)
5708 data->arg.reclaim = NFS_LOCK_RECLAIM;
5709 nfs4_set_sequence_privileged(&data->arg.seq_args);
5710 }
5711 task = rpc_run_task(&task_setup_data);
5712 if (IS_ERR(task))
5713 return PTR_ERR(task);
5714 ret = nfs4_wait_for_completion_rpc_task(task);
5715 if (ret == 0) {
5716 ret = data->rpc_status;
5717 if (ret)
5718 nfs4_handle_setlk_error(data->server, data->lsp,
5719 data->arg.new_lock_owner, ret);
5720 } else
5721 data->cancelled = 1;
5722 rpc_put_task(task);
5723 dprintk("%s: done, ret = %d!\n", __func__, ret);
5724 return ret;
5725}
5726
5727static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5728{
5729 struct nfs_server *server = NFS_SERVER(state->inode);
5730 struct nfs4_exception exception = {
5731 .inode = state->inode,
5732 };
5733 int err;
5734
5735 do {
5736 /* Cache the lock if possible... */
5737 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5738 return 0;
5739 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5740 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5741 if (err != -NFS4ERR_DELAY)
5742 break;
5743 nfs4_handle_exception(server, err, &exception);
5744 } while (exception.retry);
5745 return err;
5746}
5747
5748static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5749{
5750 struct nfs_server *server = NFS_SERVER(state->inode);
5751 struct nfs4_exception exception = {
5752 .inode = state->inode,
5753 };
5754 int err;
5755
5756 err = nfs4_set_lock_state(state, request);
5757 if (err != 0)
5758 return err;
5759 if (!recover_lost_locks) {
5760 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5761 return 0;
5762 }
5763 do {
5764 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5765 return 0;
5766 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5767 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5768 switch (err) {
5769 default:
5770 goto out;
5771 case -NFS4ERR_GRACE:
5772 case -NFS4ERR_DELAY:
5773 nfs4_handle_exception(server, err, &exception);
5774 err = 0;
5775 }
5776 } while (exception.retry);
5777out:
5778 return err;
5779}
5780
5781#if defined(CONFIG_NFS_V4_1)
5782/**
5783 * nfs41_check_expired_locks - possibly free a lock stateid
5784 *
5785 * @state: NFSv4 state for an inode
5786 *
5787 * Returns NFS_OK if recovery for this stateid is now finished.
5788 * Otherwise a negative NFS4ERR value is returned.
5789 */
5790static int nfs41_check_expired_locks(struct nfs4_state *state)
5791{
5792 int status, ret = -NFS4ERR_BAD_STATEID;
5793 struct nfs4_lock_state *lsp;
5794 struct nfs_server *server = NFS_SERVER(state->inode);
5795
5796 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5797 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5798 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5799
5800 status = nfs41_test_stateid(server,
5801 &lsp->ls_stateid,
5802 cred);
5803 trace_nfs4_test_lock_stateid(state, lsp, status);
5804 if (status != NFS_OK) {
5805 /* Free the stateid unless the server
5806 * informs us the stateid is unrecognized. */
5807 if (status != -NFS4ERR_BAD_STATEID)
5808 nfs41_free_stateid(server,
5809 &lsp->ls_stateid,
5810 cred);
5811 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5812 ret = status;
5813 }
5814 }
5815 };
5816
5817 return ret;
5818}
5819
5820static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5821{
5822 int status = NFS_OK;
5823
5824 if (test_bit(LK_STATE_IN_USE, &state->flags))
5825 status = nfs41_check_expired_locks(state);
5826 if (status != NFS_OK)
5827 status = nfs4_lock_expired(state, request);
5828 return status;
5829}
5830#endif
5831
5832static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5833{
5834 struct nfs4_state_owner *sp = state->owner;
5835 struct nfs_inode *nfsi = NFS_I(state->inode);
5836 unsigned char fl_flags = request->fl_flags;
5837 unsigned int seq;
5838 int status = -ENOLCK;
5839
5840 if ((fl_flags & FL_POSIX) &&
5841 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5842 goto out;
5843 /* Is this a delegated open? */
5844 status = nfs4_set_lock_state(state, request);
5845 if (status != 0)
5846 goto out;
5847 request->fl_flags |= FL_ACCESS;
5848 status = do_vfs_lock(request->fl_file, request);
5849 if (status < 0)
5850 goto out;
5851 down_read(&nfsi->rwsem);
5852 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5853 /* Yes: cache locks! */
5854 /* ...but avoid races with delegation recall... */
5855 request->fl_flags = fl_flags & ~FL_SLEEP;
5856 status = do_vfs_lock(request->fl_file, request);
5857 goto out_unlock;
5858 }
5859 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5860 up_read(&nfsi->rwsem);
5861 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5862 if (status != 0)
5863 goto out;
5864 down_read(&nfsi->rwsem);
5865 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5866 status = -NFS4ERR_DELAY;
5867 goto out_unlock;
5868 }
5869 /* Note: we always want to sleep here! */
5870 request->fl_flags = fl_flags | FL_SLEEP;
5871 if (do_vfs_lock(request->fl_file, request) < 0)
5872 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5873 "manager!\n", __func__);
5874out_unlock:
5875 up_read(&nfsi->rwsem);
5876out:
5877 request->fl_flags = fl_flags;
5878 return status;
5879}
5880
5881static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5882{
5883 struct nfs4_exception exception = {
5884 .state = state,
5885 .inode = state->inode,
5886 };
5887 int err;
5888
5889 do {
5890 err = _nfs4_proc_setlk(state, cmd, request);
5891 trace_nfs4_set_lock(request, state, cmd, err);
5892 if (err == -NFS4ERR_DENIED)
5893 err = -EAGAIN;
5894 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5895 err, &exception);
5896 } while (exception.retry);
5897 return err;
5898}
5899
5900static int
5901nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5902{
5903 struct nfs_open_context *ctx;
5904 struct nfs4_state *state;
5905 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5906 int status;
5907
5908 /* verify open state */
5909 ctx = nfs_file_open_context(filp);
5910 state = ctx->state;
5911
5912 if (request->fl_start < 0 || request->fl_end < 0)
5913 return -EINVAL;
5914
5915 if (IS_GETLK(cmd)) {
5916 if (state != NULL)
5917 return nfs4_proc_getlk(state, F_GETLK, request);
5918 return 0;
5919 }
5920
5921 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5922 return -EINVAL;
5923
5924 if (request->fl_type == F_UNLCK) {
5925 if (state != NULL)
5926 return nfs4_proc_unlck(state, cmd, request);
5927 return 0;
5928 }
5929
5930 if (state == NULL)
5931 return -ENOLCK;
5932 /*
5933 * Don't rely on the VFS having checked the file open mode,
5934 * since it won't do this for flock() locks.
5935 */
5936 switch (request->fl_type) {
5937 case F_RDLCK:
5938 if (!(filp->f_mode & FMODE_READ))
5939 return -EBADF;
5940 break;
5941 case F_WRLCK:
5942 if (!(filp->f_mode & FMODE_WRITE))
5943 return -EBADF;
5944 }
5945
5946 do {
5947 status = nfs4_proc_setlk(state, cmd, request);
5948 if ((status != -EAGAIN) || IS_SETLK(cmd))
5949 break;
5950 timeout = nfs4_set_lock_task_retry(timeout);
5951 status = -ERESTARTSYS;
5952 if (signalled())
5953 break;
5954 } while(status < 0);
5955 return status;
5956}
5957
5958int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5959{
5960 struct nfs_server *server = NFS_SERVER(state->inode);
5961 int err;
5962
5963 err = nfs4_set_lock_state(state, fl);
5964 if (err != 0)
5965 return err;
5966 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5967 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5968}
5969
5970struct nfs_release_lockowner_data {
5971 struct nfs4_lock_state *lsp;
5972 struct nfs_server *server;
5973 struct nfs_release_lockowner_args args;
5974 struct nfs_release_lockowner_res res;
5975 unsigned long timestamp;
5976};
5977
5978static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5979{
5980 struct nfs_release_lockowner_data *data = calldata;
5981 struct nfs_server *server = data->server;
5982 nfs40_setup_sequence(server, &data->args.seq_args,
5983 &data->res.seq_res, task);
5984 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5985 data->timestamp = jiffies;
5986}
5987
5988static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5989{
5990 struct nfs_release_lockowner_data *data = calldata;
5991 struct nfs_server *server = data->server;
5992
5993 nfs40_sequence_done(task, &data->res.seq_res);
5994
5995 switch (task->tk_status) {
5996 case 0:
5997 renew_lease(server, data->timestamp);
5998 break;
5999 case -NFS4ERR_STALE_CLIENTID:
6000 case -NFS4ERR_EXPIRED:
6001 nfs4_schedule_lease_recovery(server->nfs_client);
6002 break;
6003 case -NFS4ERR_LEASE_MOVED:
6004 case -NFS4ERR_DELAY:
6005 if (nfs4_async_handle_error(task, server,
6006 NULL, NULL) == -EAGAIN)
6007 rpc_restart_call_prepare(task);
6008 }
6009}
6010
6011static void nfs4_release_lockowner_release(void *calldata)
6012{
6013 struct nfs_release_lockowner_data *data = calldata;
6014 nfs4_free_lock_state(data->server, data->lsp);
6015 kfree(calldata);
6016}
6017
6018static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6019 .rpc_call_prepare = nfs4_release_lockowner_prepare,
6020 .rpc_call_done = nfs4_release_lockowner_done,
6021 .rpc_release = nfs4_release_lockowner_release,
6022};
6023
6024static void
6025nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6026{
6027 struct nfs_release_lockowner_data *data;
6028 struct rpc_message msg = {
6029 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6030 };
6031
6032 if (server->nfs_client->cl_mvops->minor_version != 0)
6033 return;
6034
6035 data = kmalloc(sizeof(*data), GFP_NOFS);
6036 if (!data)
6037 return;
6038 data->lsp = lsp;
6039 data->server = server;
6040 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6041 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6042 data->args.lock_owner.s_dev = server->s_dev;
6043
6044 msg.rpc_argp = &data->args;
6045 msg.rpc_resp = &data->res;
6046 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6047 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6048}
6049
6050#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6051
6052static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6053 const void *buf, size_t buflen,
6054 int flags, int type)
6055{
6056 if (strcmp(key, "") != 0)
6057 return -EINVAL;
6058
6059 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6060}
6061
6062static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6063 void *buf, size_t buflen, int type)
6064{
6065 if (strcmp(key, "") != 0)
6066 return -EINVAL;
6067
6068 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6069}
6070
6071static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6072 size_t list_len, const char *name,
6073 size_t name_len, int type)
6074{
6075 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6076
6077 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6078 return 0;
6079
6080 if (list && len <= list_len)
6081 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6082 return len;
6083}
6084
6085#ifdef CONFIG_NFS_V4_SECURITY_LABEL
6086static inline int nfs4_server_supports_labels(struct nfs_server *server)
6087{
6088 return server->caps & NFS_CAP_SECURITY_LABEL;
6089}
6090
6091static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6092 const void *buf, size_t buflen,
6093 int flags, int type)
6094{
6095 if (security_ismaclabel(key))
6096 return nfs4_set_security_label(dentry, buf, buflen);
6097
6098 return -EOPNOTSUPP;
6099}
6100
6101static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6102 void *buf, size_t buflen, int type)
6103{
6104 if (security_ismaclabel(key))
6105 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6106 return -EOPNOTSUPP;
6107}
6108
6109static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6110 size_t list_len, const char *name,
6111 size_t name_len, int type)
6112{
6113 size_t len = 0;
6114
6115 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6116 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6117 if (list && len <= list_len)
6118 security_inode_listsecurity(dentry->d_inode, list, len);
6119 }
6120 return len;
6121}
6122
6123static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6124 .prefix = XATTR_SECURITY_PREFIX,
6125 .list = nfs4_xattr_list_nfs4_label,
6126 .get = nfs4_xattr_get_nfs4_label,
6127 .set = nfs4_xattr_set_nfs4_label,
6128};
6129#endif
6130
6131
6132/*
6133 * nfs_fhget will use either the mounted_on_fileid or the fileid
6134 */
6135static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6136{
6137 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6138 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6139 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6140 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6141 return;
6142
6143 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6144 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6145 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6146 fattr->nlink = 2;
6147}
6148
6149static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6150 const struct qstr *name,
6151 struct nfs4_fs_locations *fs_locations,
6152 struct page *page)
6153{
6154 struct nfs_server *server = NFS_SERVER(dir);
6155 u32 bitmask[3] = {
6156 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6157 };
6158 struct nfs4_fs_locations_arg args = {
6159 .dir_fh = NFS_FH(dir),
6160 .name = name,
6161 .page = page,
6162 .bitmask = bitmask,
6163 };
6164 struct nfs4_fs_locations_res res = {
6165 .fs_locations = fs_locations,
6166 };
6167 struct rpc_message msg = {
6168 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6169 .rpc_argp = &args,
6170 .rpc_resp = &res,
6171 };
6172 int status;
6173
6174 dprintk("%s: start\n", __func__);
6175
6176 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6177 * is not supported */
6178 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6179 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6180 else
6181 bitmask[0] |= FATTR4_WORD0_FILEID;
6182
6183 nfs_fattr_init(&fs_locations->fattr);
6184 fs_locations->server = server;
6185 fs_locations->nlocations = 0;
6186 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6187 dprintk("%s: returned status = %d\n", __func__, status);
6188 return status;
6189}
6190
6191int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6192 const struct qstr *name,
6193 struct nfs4_fs_locations *fs_locations,
6194 struct page *page)
6195{
6196 struct nfs4_exception exception = { };
6197 int err;
6198 do {
6199 err = _nfs4_proc_fs_locations(client, dir, name,
6200 fs_locations, page);
6201 trace_nfs4_get_fs_locations(dir, name, err);
6202 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6203 &exception);
6204 } while (exception.retry);
6205 return err;
6206}
6207
6208/*
6209 * This operation also signals the server that this client is
6210 * performing migration recovery. The server can stop returning
6211 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
6212 * appended to this compound to identify the client ID which is
6213 * performing recovery.
6214 */
6215static int _nfs40_proc_get_locations(struct inode *inode,
6216 struct nfs4_fs_locations *locations,
6217 struct page *page, struct rpc_cred *cred)
6218{
6219 struct nfs_server *server = NFS_SERVER(inode);
6220 struct rpc_clnt *clnt = server->client;
6221 u32 bitmask[2] = {
6222 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6223 };
6224 struct nfs4_fs_locations_arg args = {
6225 .clientid = server->nfs_client->cl_clientid,
6226 .fh = NFS_FH(inode),
6227 .page = page,
6228 .bitmask = bitmask,
6229 .migration = 1, /* skip LOOKUP */
6230 .renew = 1, /* append RENEW */
6231 };
6232 struct nfs4_fs_locations_res res = {
6233 .fs_locations = locations,
6234 .migration = 1,
6235 .renew = 1,
6236 };
6237 struct rpc_message msg = {
6238 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6239 .rpc_argp = &args,
6240 .rpc_resp = &res,
6241 .rpc_cred = cred,
6242 };
6243 unsigned long now = jiffies;
6244 int status;
6245
6246 nfs_fattr_init(&locations->fattr);
6247 locations->server = server;
6248 locations->nlocations = 0;
6249
6250 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6251 nfs4_set_sequence_privileged(&args.seq_args);
6252 status = nfs4_call_sync_sequence(clnt, server, &msg,
6253 &args.seq_args, &res.seq_res);
6254 if (status)
6255 return status;
6256
6257 renew_lease(server, now);
6258 return 0;
6259}
6260
6261#ifdef CONFIG_NFS_V4_1
6262
6263/*
6264 * This operation also signals the server that this client is
6265 * performing migration recovery. The server can stop asserting
6266 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
6267 * performing this operation is identified in the SEQUENCE
6268 * operation in this compound.
6269 *
6270 * When the client supports GETATTR(fs_locations_info), it can
6271 * be plumbed in here.
6272 */
6273static int _nfs41_proc_get_locations(struct inode *inode,
6274 struct nfs4_fs_locations *locations,
6275 struct page *page, struct rpc_cred *cred)
6276{
6277 struct nfs_server *server = NFS_SERVER(inode);
6278 struct rpc_clnt *clnt = server->client;
6279 u32 bitmask[2] = {
6280 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6281 };
6282 struct nfs4_fs_locations_arg args = {
6283 .fh = NFS_FH(inode),
6284 .page = page,
6285 .bitmask = bitmask,
6286 .migration = 1, /* skip LOOKUP */
6287 };
6288 struct nfs4_fs_locations_res res = {
6289 .fs_locations = locations,
6290 .migration = 1,
6291 };
6292 struct rpc_message msg = {
6293 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6294 .rpc_argp = &args,
6295 .rpc_resp = &res,
6296 .rpc_cred = cred,
6297 };
6298 int status;
6299
6300 nfs_fattr_init(&locations->fattr);
6301 locations->server = server;
6302 locations->nlocations = 0;
6303
6304 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6305 nfs4_set_sequence_privileged(&args.seq_args);
6306 status = nfs4_call_sync_sequence(clnt, server, &msg,
6307 &args.seq_args, &res.seq_res);
6308 if (status == NFS4_OK &&
6309 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6310 status = -NFS4ERR_LEASE_MOVED;
6311 return status;
6312}
6313
6314#endif /* CONFIG_NFS_V4_1 */
6315
6316/**
6317 * nfs4_proc_get_locations - discover locations for a migrated FSID
6318 * @inode: inode on FSID that is migrating
6319 * @locations: result of query
6320 * @page: buffer
6321 * @cred: credential to use for this operation
6322 *
6323 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6324 * operation failed, or a negative errno if a local error occurred.
6325 *
6326 * On success, "locations" is filled in, but if the server has
6327 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6328 * asserted.
6329 *
6330 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6331 * from this client that require migration recovery.
6332 */
6333int nfs4_proc_get_locations(struct inode *inode,
6334 struct nfs4_fs_locations *locations,
6335 struct page *page, struct rpc_cred *cred)
6336{
6337 struct nfs_server *server = NFS_SERVER(inode);
6338 struct nfs_client *clp = server->nfs_client;
6339 const struct nfs4_mig_recovery_ops *ops =
6340 clp->cl_mvops->mig_recovery_ops;
6341 struct nfs4_exception exception = { };
6342 int status;
6343
6344 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6345 (unsigned long long)server->fsid.major,
6346 (unsigned long long)server->fsid.minor,
6347 clp->cl_hostname);
6348 nfs_display_fhandle(NFS_FH(inode), __func__);
6349
6350 do {
6351 status = ops->get_locations(inode, locations, page, cred);
6352 if (status != -NFS4ERR_DELAY)
6353 break;
6354 nfs4_handle_exception(server, status, &exception);
6355 } while (exception.retry);
6356 return status;
6357}
6358
6359/*
6360 * This operation also signals the server that this client is
6361 * performing "lease moved" recovery. The server can stop
6362 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
6363 * is appended to this compound to identify the client ID which is
6364 * performing recovery.
6365 */
6366static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6367{
6368 struct nfs_server *server = NFS_SERVER(inode);
6369 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6370 struct rpc_clnt *clnt = server->client;
6371 struct nfs4_fsid_present_arg args = {
6372 .fh = NFS_FH(inode),
6373 .clientid = clp->cl_clientid,
6374 .renew = 1, /* append RENEW */
6375 };
6376 struct nfs4_fsid_present_res res = {
6377 .renew = 1,
6378 };
6379 struct rpc_message msg = {
6380 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6381 .rpc_argp = &args,
6382 .rpc_resp = &res,
6383 .rpc_cred = cred,
6384 };
6385 unsigned long now = jiffies;
6386 int status;
6387
6388 res.fh = nfs_alloc_fhandle();
6389 if (res.fh == NULL)
6390 return -ENOMEM;
6391
6392 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6393 nfs4_set_sequence_privileged(&args.seq_args);
6394 status = nfs4_call_sync_sequence(clnt, server, &msg,
6395 &args.seq_args, &res.seq_res);
6396 nfs_free_fhandle(res.fh);
6397 if (status)
6398 return status;
6399
6400 do_renew_lease(clp, now);
6401 return 0;
6402}
6403
6404#ifdef CONFIG_NFS_V4_1
6405
6406/*
6407 * This operation also signals the server that this client is
6408 * performing "lease moved" recovery. The server can stop asserting
6409 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
6410 * this operation is identified in the SEQUENCE operation in this
6411 * compound.
6412 */
6413static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6414{
6415 struct nfs_server *server = NFS_SERVER(inode);
6416 struct rpc_clnt *clnt = server->client;
6417 struct nfs4_fsid_present_arg args = {
6418 .fh = NFS_FH(inode),
6419 };
6420 struct nfs4_fsid_present_res res = {
6421 };
6422 struct rpc_message msg = {
6423 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6424 .rpc_argp = &args,
6425 .rpc_resp = &res,
6426 .rpc_cred = cred,
6427 };
6428 int status;
6429
6430 res.fh = nfs_alloc_fhandle();
6431 if (res.fh == NULL)
6432 return -ENOMEM;
6433
6434 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6435 nfs4_set_sequence_privileged(&args.seq_args);
6436 status = nfs4_call_sync_sequence(clnt, server, &msg,
6437 &args.seq_args, &res.seq_res);
6438 nfs_free_fhandle(res.fh);
6439 if (status == NFS4_OK &&
6440 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6441 status = -NFS4ERR_LEASE_MOVED;
6442 return status;
6443}
6444
6445#endif /* CONFIG_NFS_V4_1 */
6446
6447/**
6448 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6449 * @inode: inode on FSID to check
6450 * @cred: credential to use for this operation
6451 *
6452 * Server indicates whether the FSID is present, moved, or not
6453 * recognized. This operation is necessary to clear a LEASE_MOVED
6454 * condition for this client ID.
6455 *
6456 * Returns NFS4_OK if the FSID is present on this server,
6457 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6458 * NFS4ERR code if some error occurred on the server, or a
6459 * negative errno if a local failure occurred.
6460 */
6461int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6462{
6463 struct nfs_server *server = NFS_SERVER(inode);
6464 struct nfs_client *clp = server->nfs_client;
6465 const struct nfs4_mig_recovery_ops *ops =
6466 clp->cl_mvops->mig_recovery_ops;
6467 struct nfs4_exception exception = { };
6468 int status;
6469
6470 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6471 (unsigned long long)server->fsid.major,
6472 (unsigned long long)server->fsid.minor,
6473 clp->cl_hostname);
6474 nfs_display_fhandle(NFS_FH(inode), __func__);
6475
6476 do {
6477 status = ops->fsid_present(inode, cred);
6478 if (status != -NFS4ERR_DELAY)
6479 break;
6480 nfs4_handle_exception(server, status, &exception);
6481 } while (exception.retry);
6482 return status;
6483}
6484
6485/**
6486 * If 'use_integrity' is true and the state managment nfs_client
6487 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6488 * and the machine credential as per RFC3530bis and RFC5661 Security
6489 * Considerations sections. Otherwise, just use the user cred with the
6490 * filesystem's rpc_client.
6491 */
6492static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6493{
6494 int status;
6495 struct nfs4_secinfo_arg args = {
6496 .dir_fh = NFS_FH(dir),
6497 .name = name,
6498 };
6499 struct nfs4_secinfo_res res = {
6500 .flavors = flavors,
6501 };
6502 struct rpc_message msg = {
6503 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6504 .rpc_argp = &args,
6505 .rpc_resp = &res,
6506 };
6507 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6508 struct rpc_cred *cred = NULL;
6509
6510 if (use_integrity) {
6511 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6512 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6513 msg.rpc_cred = cred;
6514 }
6515
6516 dprintk("NFS call secinfo %s\n", name->name);
6517
6518 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6519 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6520
6521 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6522 &res.seq_res, 0);
6523 dprintk("NFS reply secinfo: %d\n", status);
6524
6525 if (cred)
6526 put_rpccred(cred);
6527
6528 return status;
6529}
6530
6531int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6532 struct nfs4_secinfo_flavors *flavors)
6533{
6534 struct nfs4_exception exception = { };
6535 int err;
6536 do {
6537 err = -NFS4ERR_WRONGSEC;
6538
6539 /* try to use integrity protection with machine cred */
6540 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6541 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6542
6543 /*
6544 * if unable to use integrity protection, or SECINFO with
6545 * integrity protection returns NFS4ERR_WRONGSEC (which is
6546 * disallowed by spec, but exists in deployed servers) use
6547 * the current filesystem's rpc_client and the user cred.
6548 */
6549 if (err == -NFS4ERR_WRONGSEC)
6550 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6551
6552 trace_nfs4_secinfo(dir, name, err);
6553 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6554 &exception);
6555 } while (exception.retry);
6556 return err;
6557}
6558
6559#ifdef CONFIG_NFS_V4_1
6560/*
6561 * Check the exchange flags returned by the server for invalid flags, having
6562 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6563 * DS flags set.
6564 */
6565static int nfs4_check_cl_exchange_flags(u32 flags)
6566{
6567 if (flags & ~EXCHGID4_FLAG_MASK_R)
6568 goto out_inval;
6569 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6570 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6571 goto out_inval;
6572 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6573 goto out_inval;
6574 return NFS_OK;
6575out_inval:
6576 return -NFS4ERR_INVAL;
6577}
6578
6579static bool
6580nfs41_same_server_scope(struct nfs41_server_scope *a,
6581 struct nfs41_server_scope *b)
6582{
6583 if (a->server_scope_sz == b->server_scope_sz &&
6584 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6585 return true;
6586
6587 return false;
6588}
6589
6590/*
6591 * nfs4_proc_bind_conn_to_session()
6592 *
6593 * The 4.1 client currently uses the same TCP connection for the
6594 * fore and backchannel.
6595 */
6596int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6597{
6598 int status;
6599 struct nfs41_bind_conn_to_session_res res;
6600 struct rpc_message msg = {
6601 .rpc_proc =
6602 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6603 .rpc_argp = clp,
6604 .rpc_resp = &res,
6605 .rpc_cred = cred,
6606 };
6607
6608 dprintk("--> %s\n", __func__);
6609
6610 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6611 if (unlikely(res.session == NULL)) {
6612 status = -ENOMEM;
6613 goto out;
6614 }
6615
6616 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6617 trace_nfs4_bind_conn_to_session(clp, status);
6618 if (status == 0) {
6619 if (memcmp(res.session->sess_id.data,
6620 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6621 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6622 status = -EIO;
6623 goto out_session;
6624 }
6625 if (res.dir != NFS4_CDFS4_BOTH) {
6626 dprintk("NFS: %s: Unexpected direction from server\n",
6627 __func__);
6628 status = -EIO;
6629 goto out_session;
6630 }
6631 if (res.use_conn_in_rdma_mode) {
6632 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6633 __func__);
6634 status = -EIO;
6635 goto out_session;
6636 }
6637 }
6638out_session:
6639 kfree(res.session);
6640out:
6641 dprintk("<-- %s status= %d\n", __func__, status);
6642 return status;
6643}
6644
6645/*
6646 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6647 * and operations we'd like to see to enable certain features in the allow map
6648 */
6649static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6650 .how = SP4_MACH_CRED,
6651 .enforce.u.words = {
6652 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6653 1 << (OP_EXCHANGE_ID - 32) |
6654 1 << (OP_CREATE_SESSION - 32) |
6655 1 << (OP_DESTROY_SESSION - 32) |
6656 1 << (OP_DESTROY_CLIENTID - 32)
6657 },
6658 .allow.u.words = {
6659 [0] = 1 << (OP_CLOSE) |
6660 1 << (OP_LOCKU) |
6661 1 << (OP_COMMIT),
6662 [1] = 1 << (OP_SECINFO - 32) |
6663 1 << (OP_SECINFO_NO_NAME - 32) |
6664 1 << (OP_TEST_STATEID - 32) |
6665 1 << (OP_FREE_STATEID - 32) |
6666 1 << (OP_WRITE - 32)
6667 }
6668};
6669
6670/*
6671 * Select the state protection mode for client `clp' given the server results
6672 * from exchange_id in `sp'.
6673 *
6674 * Returns 0 on success, negative errno otherwise.
6675 */
6676static int nfs4_sp4_select_mode(struct nfs_client *clp,
6677 struct nfs41_state_protection *sp)
6678{
6679 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6680 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6681 1 << (OP_EXCHANGE_ID - 32) |
6682 1 << (OP_CREATE_SESSION - 32) |
6683 1 << (OP_DESTROY_SESSION - 32) |
6684 1 << (OP_DESTROY_CLIENTID - 32)
6685 };
6686 unsigned int i;
6687
6688 if (sp->how == SP4_MACH_CRED) {
6689 /* Print state protect result */
6690 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6691 for (i = 0; i <= LAST_NFS4_OP; i++) {
6692 if (test_bit(i, sp->enforce.u.longs))
6693 dfprintk(MOUNT, " enforce op %d\n", i);
6694 if (test_bit(i, sp->allow.u.longs))
6695 dfprintk(MOUNT, " allow op %d\n", i);
6696 }
6697
6698 /* make sure nothing is on enforce list that isn't supported */
6699 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6700 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6701 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6702 return -EINVAL;
6703 }
6704 }
6705
6706 /*
6707 * Minimal mode - state operations are allowed to use machine
6708 * credential. Note this already happens by default, so the
6709 * client doesn't have to do anything more than the negotiation.
6710 *
6711 * NOTE: we don't care if EXCHANGE_ID is in the list -
6712 * we're already using the machine cred for exchange_id
6713 * and will never use a different cred.
6714 */
6715 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6716 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6717 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6718 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6719 dfprintk(MOUNT, "sp4_mach_cred:\n");
6720 dfprintk(MOUNT, " minimal mode enabled\n");
6721 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6722 } else {
6723 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6724 return -EINVAL;
6725 }
6726
6727 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6728 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6729 dfprintk(MOUNT, " cleanup mode enabled\n");
6730 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6731 }
6732
6733 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6734 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6735 dfprintk(MOUNT, " secinfo mode enabled\n");
6736 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6737 }
6738
6739 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6740 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6741 dfprintk(MOUNT, " stateid mode enabled\n");
6742 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6743 }
6744
6745 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6746 dfprintk(MOUNT, " write mode enabled\n");
6747 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6748 }
6749
6750 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6751 dfprintk(MOUNT, " commit mode enabled\n");
6752 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6753 }
6754 }
6755
6756 return 0;
6757}
6758
6759/*
6760 * _nfs4_proc_exchange_id()
6761 *
6762 * Wrapper for EXCHANGE_ID operation.
6763 */
6764static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6765 u32 sp4_how)
6766{
6767 nfs4_verifier verifier;
6768 struct nfs41_exchange_id_args args = {
6769 .verifier = &verifier,
6770 .client = clp,
6771#ifdef CONFIG_NFS_V4_1_MIGRATION
6772 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6773 EXCHGID4_FLAG_BIND_PRINC_STATEID |
6774 EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6775#else
6776 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6777 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6778#endif
6779 };
6780 struct nfs41_exchange_id_res res = {
6781 0
6782 };
6783 int status;
6784 struct rpc_message msg = {
6785 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6786 .rpc_argp = &args,
6787 .rpc_resp = &res,
6788 .rpc_cred = cred,
6789 };
6790
6791 nfs4_init_boot_verifier(clp, &verifier);
6792 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6793 sizeof(args.id));
6794 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6795 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6796 args.id_len, args.id);
6797
6798 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6799 GFP_NOFS);
6800 if (unlikely(res.server_owner == NULL)) {
6801 status = -ENOMEM;
6802 goto out;
6803 }
6804
6805 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6806 GFP_NOFS);
6807 if (unlikely(res.server_scope == NULL)) {
6808 status = -ENOMEM;
6809 goto out_server_owner;
6810 }
6811
6812 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6813 if (unlikely(res.impl_id == NULL)) {
6814 status = -ENOMEM;
6815 goto out_server_scope;
6816 }
6817
6818 switch (sp4_how) {
6819 case SP4_NONE:
6820 args.state_protect.how = SP4_NONE;
6821 break;
6822
6823 case SP4_MACH_CRED:
6824 args.state_protect = nfs4_sp4_mach_cred_request;
6825 break;
6826
6827 default:
6828 /* unsupported! */
6829 WARN_ON_ONCE(1);
6830 status = -EINVAL;
6831 goto out_server_scope;
6832 }
6833
6834 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6835 trace_nfs4_exchange_id(clp, status);
6836 if (status == 0)
6837 status = nfs4_check_cl_exchange_flags(res.flags);
6838
6839 if (status == 0)
6840 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6841
6842 if (status == 0) {
6843 clp->cl_clientid = res.clientid;
6844 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6845 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6846 clp->cl_seqid = res.seqid;
6847
6848 kfree(clp->cl_serverowner);
6849 clp->cl_serverowner = res.server_owner;
6850 res.server_owner = NULL;
6851
6852 /* use the most recent implementation id */
6853 kfree(clp->cl_implid);
6854 clp->cl_implid = res.impl_id;
6855
6856 if (clp->cl_serverscope != NULL &&
6857 !nfs41_same_server_scope(clp->cl_serverscope,
6858 res.server_scope)) {
6859 dprintk("%s: server_scope mismatch detected\n",
6860 __func__);
6861 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6862 kfree(clp->cl_serverscope);
6863 clp->cl_serverscope = NULL;
6864 }
6865
6866 if (clp->cl_serverscope == NULL) {
6867 clp->cl_serverscope = res.server_scope;
6868 goto out;
6869 }
6870 } else
6871 kfree(res.impl_id);
6872
6873out_server_owner:
6874 kfree(res.server_owner);
6875out_server_scope:
6876 kfree(res.server_scope);
6877out:
6878 if (clp->cl_implid != NULL)
6879 dprintk("NFS reply exchange_id: Server Implementation ID: "
6880 "domain: %s, name: %s, date: %llu,%u\n",
6881 clp->cl_implid->domain, clp->cl_implid->name,
6882 clp->cl_implid->date.seconds,
6883 clp->cl_implid->date.nseconds);
6884 dprintk("NFS reply exchange_id: %d\n", status);
6885 return status;
6886}
6887
6888/*
6889 * nfs4_proc_exchange_id()
6890 *
6891 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6892 *
6893 * Since the clientid has expired, all compounds using sessions
6894 * associated with the stale clientid will be returning
6895 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6896 * be in some phase of session reset.
6897 *
6898 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6899 */
6900int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6901{
6902 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6903 int status;
6904
6905 /* try SP4_MACH_CRED if krb5i/p */
6906 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6907 authflavor == RPC_AUTH_GSS_KRB5P) {
6908 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6909 if (!status)
6910 return 0;
6911 }
6912
6913 /* try SP4_NONE */
6914 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6915}
6916
6917static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6918 struct rpc_cred *cred)
6919{
6920 struct rpc_message msg = {
6921 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6922 .rpc_argp = clp,
6923 .rpc_cred = cred,
6924 };
6925 int status;
6926
6927 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6928 trace_nfs4_destroy_clientid(clp, status);
6929 if (status)
6930 dprintk("NFS: Got error %d from the server %s on "
6931 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6932 return status;
6933}
6934
6935static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6936 struct rpc_cred *cred)
6937{
6938 unsigned int loop;
6939 int ret;
6940
6941 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6942 ret = _nfs4_proc_destroy_clientid(clp, cred);
6943 switch (ret) {
6944 case -NFS4ERR_DELAY:
6945 case -NFS4ERR_CLIENTID_BUSY:
6946 ssleep(1);
6947 break;
6948 default:
6949 return ret;
6950 }
6951 }
6952 return 0;
6953}
6954
6955int nfs4_destroy_clientid(struct nfs_client *clp)
6956{
6957 struct rpc_cred *cred;
6958 int ret = 0;
6959
6960 if (clp->cl_mvops->minor_version < 1)
6961 goto out;
6962 if (clp->cl_exchange_flags == 0)
6963 goto out;
6964 if (clp->cl_preserve_clid)
6965 goto out;
6966 cred = nfs4_get_clid_cred(clp);
6967 ret = nfs4_proc_destroy_clientid(clp, cred);
6968 if (cred)
6969 put_rpccred(cred);
6970 switch (ret) {
6971 case 0:
6972 case -NFS4ERR_STALE_CLIENTID:
6973 clp->cl_exchange_flags = 0;
6974 }
6975out:
6976 return ret;
6977}
6978
6979struct nfs4_get_lease_time_data {
6980 struct nfs4_get_lease_time_args *args;
6981 struct nfs4_get_lease_time_res *res;
6982 struct nfs_client *clp;
6983};
6984
6985static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6986 void *calldata)
6987{
6988 struct nfs4_get_lease_time_data *data =
6989 (struct nfs4_get_lease_time_data *)calldata;
6990
6991 dprintk("--> %s\n", __func__);
6992 /* just setup sequence, do not trigger session recovery
6993 since we're invoked within one */
6994 nfs41_setup_sequence(data->clp->cl_session,
6995 &data->args->la_seq_args,
6996 &data->res->lr_seq_res,
6997 task);
6998 dprintk("<-- %s\n", __func__);
6999}
7000
7001/*
7002 * Called from nfs4_state_manager thread for session setup, so don't recover
7003 * from sequence operation or clientid errors.
7004 */
7005static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7006{
7007 struct nfs4_get_lease_time_data *data =
7008 (struct nfs4_get_lease_time_data *)calldata;
7009
7010 dprintk("--> %s\n", __func__);
7011 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7012 return;
7013 switch (task->tk_status) {
7014 case -NFS4ERR_DELAY:
7015 case -NFS4ERR_GRACE:
7016 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7017 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7018 task->tk_status = 0;
7019 /* fall through */
7020 case -NFS4ERR_RETRY_UNCACHED_REP:
7021 rpc_restart_call_prepare(task);
7022 return;
7023 }
7024 dprintk("<-- %s\n", __func__);
7025}
7026
7027static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7028 .rpc_call_prepare = nfs4_get_lease_time_prepare,
7029 .rpc_call_done = nfs4_get_lease_time_done,
7030};
7031
7032int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7033{
7034 struct rpc_task *task;
7035 struct nfs4_get_lease_time_args args;
7036 struct nfs4_get_lease_time_res res = {
7037 .lr_fsinfo = fsinfo,
7038 };
7039 struct nfs4_get_lease_time_data data = {
7040 .args = &args,
7041 .res = &res,
7042 .clp = clp,
7043 };
7044 struct rpc_message msg = {
7045 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7046 .rpc_argp = &args,
7047 .rpc_resp = &res,
7048 };
7049 struct rpc_task_setup task_setup = {
7050 .rpc_client = clp->cl_rpcclient,
7051 .rpc_message = &msg,
7052 .callback_ops = &nfs4_get_lease_time_ops,
7053 .callback_data = &data,
7054 .flags = RPC_TASK_TIMEOUT,
7055 };
7056 int status;
7057
7058 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7059 nfs4_set_sequence_privileged(&args.la_seq_args);
7060 dprintk("--> %s\n", __func__);
7061 task = rpc_run_task(&task_setup);
7062
7063 if (IS_ERR(task))
7064 status = PTR_ERR(task);
7065 else {
7066 status = task->tk_status;
7067 rpc_put_task(task);
7068 }
7069 dprintk("<-- %s return %d\n", __func__, status);
7070
7071 return status;
7072}
7073
7074/*
7075 * Initialize the values to be used by the client in CREATE_SESSION
7076 * If nfs4_init_session set the fore channel request and response sizes,
7077 * use them.
7078 *
7079 * Set the back channel max_resp_sz_cached to zero to force the client to
7080 * always set csa_cachethis to FALSE because the current implementation
7081 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7082 */
7083static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7084{
7085 unsigned int max_rqst_sz, max_resp_sz;
7086
7087 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7088 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7089
7090 /* Fore channel attributes */
7091 args->fc_attrs.max_rqst_sz = max_rqst_sz;
7092 args->fc_attrs.max_resp_sz = max_resp_sz;
7093 args->fc_attrs.max_ops = NFS4_MAX_OPS;
7094 args->fc_attrs.max_reqs = max_session_slots;
7095
7096 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7097 "max_ops=%u max_reqs=%u\n",
7098 __func__,
7099 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7100 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7101
7102 /* Back channel attributes */
7103 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7104 args->bc_attrs.max_resp_sz = PAGE_SIZE;
7105 args->bc_attrs.max_resp_sz_cached = 0;
7106 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7107 args->bc_attrs.max_reqs = 1;
7108
7109 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7110 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7111 __func__,
7112 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7113 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7114 args->bc_attrs.max_reqs);
7115}
7116
7117static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7118{
7119 struct nfs4_channel_attrs *sent = &args->fc_attrs;
7120 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7121
7122 if (rcvd->max_resp_sz > sent->max_resp_sz)
7123 return -EINVAL;
7124 /*
7125 * Our requested max_ops is the minimum we need; we're not
7126 * prepared to break up compounds into smaller pieces than that.
7127 * So, no point even trying to continue if the server won't
7128 * cooperate:
7129 */
7130 if (rcvd->max_ops < sent->max_ops)
7131 return -EINVAL;
7132 if (rcvd->max_reqs == 0)
7133 return -EINVAL;
7134 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7135 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7136 return 0;
7137}
7138
7139static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7140{
7141 struct nfs4_channel_attrs *sent = &args->bc_attrs;
7142 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7143
7144 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7145 return -EINVAL;
7146 if (rcvd->max_resp_sz < sent->max_resp_sz)
7147 return -EINVAL;
7148 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7149 return -EINVAL;
7150 /* These would render the backchannel useless: */
7151 if (rcvd->max_ops != sent->max_ops)
7152 return -EINVAL;
7153 if (rcvd->max_reqs != sent->max_reqs)
7154 return -EINVAL;
7155 return 0;
7156}
7157
7158static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7159 struct nfs4_session *session)
7160{
7161 int ret;
7162
7163 ret = nfs4_verify_fore_channel_attrs(args, session);
7164 if (ret)
7165 return ret;
7166 return nfs4_verify_back_channel_attrs(args, session);
7167}
7168
7169static int _nfs4_proc_create_session(struct nfs_client *clp,
7170 struct rpc_cred *cred)
7171{
7172 struct nfs4_session *session = clp->cl_session;
7173 struct nfs41_create_session_args args = {
7174 .client = clp,
7175 .cb_program = NFS4_CALLBACK,
7176 };
7177 struct nfs41_create_session_res res = {
7178 .client = clp,
7179 };
7180 struct rpc_message msg = {
7181 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7182 .rpc_argp = &args,
7183 .rpc_resp = &res,
7184 .rpc_cred = cred,
7185 };
7186 int status;
7187
7188 nfs4_init_channel_attrs(&args);
7189 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7190
7191 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7192 trace_nfs4_create_session(clp, status);
7193
7194 if (!status) {
7195 /* Verify the session's negotiated channel_attrs values */
7196 status = nfs4_verify_channel_attrs(&args, session);
7197 /* Increment the clientid slot sequence id */
7198 clp->cl_seqid++;
7199 }
7200
7201 return status;
7202}
7203
7204/*
7205 * Issues a CREATE_SESSION operation to the server.
7206 * It is the responsibility of the caller to verify the session is
7207 * expired before calling this routine.
7208 */
7209int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7210{
7211 int status;
7212 unsigned *ptr;
7213 struct nfs4_session *session = clp->cl_session;
7214
7215 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7216
7217 status = _nfs4_proc_create_session(clp, cred);
7218 if (status)
7219 goto out;
7220
7221 /* Init or reset the session slot tables */
7222 status = nfs4_setup_session_slot_tables(session);
7223 dprintk("slot table setup returned %d\n", status);
7224 if (status)
7225 goto out;
7226
7227 ptr = (unsigned *)&session->sess_id.data[0];
7228 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7229 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7230out:
7231 dprintk("<-- %s\n", __func__);
7232 return status;
7233}
7234
7235/*
7236 * Issue the over-the-wire RPC DESTROY_SESSION.
7237 * The caller must serialize access to this routine.
7238 */
7239int nfs4_proc_destroy_session(struct nfs4_session *session,
7240 struct rpc_cred *cred)
7241{
7242 struct rpc_message msg = {
7243 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7244 .rpc_argp = session,
7245 .rpc_cred = cred,
7246 };
7247 int status = 0;
7248
7249 dprintk("--> nfs4_proc_destroy_session\n");
7250
7251 /* session is still being setup */
7252 if (session->clp->cl_cons_state != NFS_CS_READY)
7253 return status;
7254
7255 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7256 trace_nfs4_destroy_session(session->clp, status);
7257
7258 if (status)
7259 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7260 "Session has been destroyed regardless...\n", status);
7261
7262 dprintk("<-- nfs4_proc_destroy_session\n");
7263 return status;
7264}
7265
7266/*
7267 * Renew the cl_session lease.
7268 */
7269struct nfs4_sequence_data {
7270 struct nfs_client *clp;
7271 struct nfs4_sequence_args args;
7272 struct nfs4_sequence_res res;
7273};
7274
7275static void nfs41_sequence_release(void *data)
7276{
7277 struct nfs4_sequence_data *calldata = data;
7278 struct nfs_client *clp = calldata->clp;
7279
7280 if (atomic_read(&clp->cl_count) > 1)
7281 nfs4_schedule_state_renewal(clp);
7282 nfs_put_client(clp);
7283 kfree(calldata);
7284}
7285
7286static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7287{
7288 switch(task->tk_status) {
7289 case -NFS4ERR_DELAY:
7290 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7291 return -EAGAIN;
7292 default:
7293 nfs4_schedule_lease_recovery(clp);
7294 }
7295 return 0;
7296}
7297
7298static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7299{
7300 struct nfs4_sequence_data *calldata = data;
7301 struct nfs_client *clp = calldata->clp;
7302
7303 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7304 return;
7305
7306 trace_nfs4_sequence(clp, task->tk_status);
7307 if (task->tk_status < 0) {
7308 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7309 if (atomic_read(&clp->cl_count) == 1)
7310 goto out;
7311
7312 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7313 rpc_restart_call_prepare(task);
7314 return;
7315 }
7316 }
7317 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7318out:
7319 dprintk("<-- %s\n", __func__);
7320}
7321
7322static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7323{
7324 struct nfs4_sequence_data *calldata = data;
7325 struct nfs_client *clp = calldata->clp;
7326 struct nfs4_sequence_args *args;
7327 struct nfs4_sequence_res *res;
7328
7329 args = task->tk_msg.rpc_argp;
7330 res = task->tk_msg.rpc_resp;
7331
7332 nfs41_setup_sequence(clp->cl_session, args, res, task);
7333}
7334
7335static const struct rpc_call_ops nfs41_sequence_ops = {
7336 .rpc_call_done = nfs41_sequence_call_done,
7337 .rpc_call_prepare = nfs41_sequence_prepare,
7338 .rpc_release = nfs41_sequence_release,
7339};
7340
7341static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7342 struct rpc_cred *cred,
7343 bool is_privileged)
7344{
7345 struct nfs4_sequence_data *calldata;
7346 struct rpc_message msg = {
7347 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7348 .rpc_cred = cred,
7349 };
7350 struct rpc_task_setup task_setup_data = {
7351 .rpc_client = clp->cl_rpcclient,
7352 .rpc_message = &msg,
7353 .callback_ops = &nfs41_sequence_ops,
7354 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7355 };
7356
7357 if (!atomic_inc_not_zero(&clp->cl_count))
7358 return ERR_PTR(-EIO);
7359 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7360 if (calldata == NULL) {
7361 nfs_put_client(clp);
7362 return ERR_PTR(-ENOMEM);
7363 }
7364 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7365 if (is_privileged)
7366 nfs4_set_sequence_privileged(&calldata->args);
7367 msg.rpc_argp = &calldata->args;
7368 msg.rpc_resp = &calldata->res;
7369 calldata->clp = clp;
7370 task_setup_data.callback_data = calldata;
7371
7372 return rpc_run_task(&task_setup_data);
7373}
7374
7375static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7376{
7377 struct rpc_task *task;
7378 int ret = 0;
7379
7380 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7381 return -EAGAIN;
7382 task = _nfs41_proc_sequence(clp, cred, false);
7383 if (IS_ERR(task))
7384 ret = PTR_ERR(task);
7385 else
7386 rpc_put_task_async(task);
7387 dprintk("<-- %s status=%d\n", __func__, ret);
7388 return ret;
7389}
7390
7391static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7392{
7393 struct rpc_task *task;
7394 int ret;
7395
7396 task = _nfs41_proc_sequence(clp, cred, true);
7397 if (IS_ERR(task)) {
7398 ret = PTR_ERR(task);
7399 goto out;
7400 }
7401 ret = rpc_wait_for_completion_task(task);
7402 if (!ret) {
7403 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7404
7405 if (task->tk_status == 0)
7406 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7407 ret = task->tk_status;
7408 }
7409 rpc_put_task(task);
7410out:
7411 dprintk("<-- %s status=%d\n", __func__, ret);
7412 return ret;
7413}
7414
7415struct nfs4_reclaim_complete_data {
7416 struct nfs_client *clp;
7417 struct nfs41_reclaim_complete_args arg;
7418 struct nfs41_reclaim_complete_res res;
7419};
7420
7421static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7422{
7423 struct nfs4_reclaim_complete_data *calldata = data;
7424
7425 nfs41_setup_sequence(calldata->clp->cl_session,
7426 &calldata->arg.seq_args,
7427 &calldata->res.seq_res,
7428 task);
7429}
7430
7431static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7432{
7433 switch(task->tk_status) {
7434 case 0:
7435 case -NFS4ERR_COMPLETE_ALREADY:
7436 case -NFS4ERR_WRONG_CRED: /* What to do here? */
7437 break;
7438 case -NFS4ERR_DELAY:
7439 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7440 /* fall through */
7441 case -NFS4ERR_RETRY_UNCACHED_REP:
7442 return -EAGAIN;
7443 default:
7444 nfs4_schedule_lease_recovery(clp);
7445 }
7446 return 0;
7447}
7448
7449static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7450{
7451 struct nfs4_reclaim_complete_data *calldata = data;
7452 struct nfs_client *clp = calldata->clp;
7453 struct nfs4_sequence_res *res = &calldata->res.seq_res;
7454
7455 dprintk("--> %s\n", __func__);
7456 if (!nfs41_sequence_done(task, res))
7457 return;
7458
7459 trace_nfs4_reclaim_complete(clp, task->tk_status);
7460 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7461 rpc_restart_call_prepare(task);
7462 return;
7463 }
7464 dprintk("<-- %s\n", __func__);
7465}
7466
7467static void nfs4_free_reclaim_complete_data(void *data)
7468{
7469 struct nfs4_reclaim_complete_data *calldata = data;
7470
7471 kfree(calldata);
7472}
7473
7474static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7475 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7476 .rpc_call_done = nfs4_reclaim_complete_done,
7477 .rpc_release = nfs4_free_reclaim_complete_data,
7478};
7479
7480/*
7481 * Issue a global reclaim complete.
7482 */
7483static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7484 struct rpc_cred *cred)
7485{
7486 struct nfs4_reclaim_complete_data *calldata;
7487 struct rpc_task *task;
7488 struct rpc_message msg = {
7489 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7490 .rpc_cred = cred,
7491 };
7492 struct rpc_task_setup task_setup_data = {
7493 .rpc_client = clp->cl_rpcclient,
7494 .rpc_message = &msg,
7495 .callback_ops = &nfs4_reclaim_complete_call_ops,
7496 .flags = RPC_TASK_ASYNC,
7497 };
7498 int status = -ENOMEM;
7499
7500 dprintk("--> %s\n", __func__);
7501 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7502 if (calldata == NULL)
7503 goto out;
7504 calldata->clp = clp;
7505 calldata->arg.one_fs = 0;
7506
7507 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7508 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7509 msg.rpc_argp = &calldata->arg;
7510 msg.rpc_resp = &calldata->res;
7511 task_setup_data.callback_data = calldata;
7512 task = rpc_run_task(&task_setup_data);
7513 if (IS_ERR(task)) {
7514 status = PTR_ERR(task);
7515 goto out;
7516 }
7517 status = nfs4_wait_for_completion_rpc_task(task);
7518 if (status == 0)
7519 status = task->tk_status;
7520 rpc_put_task(task);
7521 return 0;
7522out:
7523 dprintk("<-- %s status=%d\n", __func__, status);
7524 return status;
7525}
7526
7527static void
7528nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7529{
7530 struct nfs4_layoutget *lgp = calldata;
7531 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7532 struct nfs4_session *session = nfs4_get_session(server);
7533
7534 dprintk("--> %s\n", __func__);
7535 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7536 * right now covering the LAYOUTGET we are about to send.
7537 * However, that is not so catastrophic, and there seems
7538 * to be no way to prevent it completely.
7539 */
7540 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7541 &lgp->res.seq_res, task))
7542 return;
7543 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7544 NFS_I(lgp->args.inode)->layout,
7545 lgp->args.ctx->state)) {
7546 rpc_exit(task, NFS4_OK);
7547 }
7548}
7549
7550static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7551{
7552 struct nfs4_layoutget *lgp = calldata;
7553 struct inode *inode = lgp->args.inode;
7554 struct nfs_server *server = NFS_SERVER(inode);
7555 struct pnfs_layout_hdr *lo;
7556 struct nfs4_state *state = NULL;
7557 unsigned long timeo, now, giveup;
7558
7559 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7560
7561 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7562 goto out;
7563
7564 switch (task->tk_status) {
7565 case 0:
7566 goto out;
7567 /*
7568 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7569 * (or clients) writing to the same RAID stripe
7570 */
7571 case -NFS4ERR_LAYOUTTRYLATER:
7572 /*
7573 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7574 * existing layout before getting a new one).
7575 */
7576 case -NFS4ERR_RECALLCONFLICT:
7577 timeo = rpc_get_timeout(task->tk_client);
7578 giveup = lgp->args.timestamp + timeo;
7579 now = jiffies;
7580 if (time_after(giveup, now)) {
7581 unsigned long delay;
7582
7583 /* Delay for:
7584 * - Not less then NFS4_POLL_RETRY_MIN.
7585 * - One last time a jiffie before we give up
7586 * - exponential backoff (time_now minus start_attempt)
7587 */
7588 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7589 min((giveup - now - 1),
7590 now - lgp->args.timestamp));
7591
7592 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7593 __func__, delay);
7594 rpc_delay(task, delay);
7595 task->tk_status = 0;
7596 rpc_restart_call_prepare(task);
7597 goto out; /* Do not call nfs4_async_handle_error() */
7598 }
7599 break;
7600 case -NFS4ERR_EXPIRED:
7601 case -NFS4ERR_BAD_STATEID:
7602 spin_lock(&inode->i_lock);
7603 lo = NFS_I(inode)->layout;
7604 if (!lo || list_empty(&lo->plh_segs)) {
7605 spin_unlock(&inode->i_lock);
7606 /* If the open stateid was bad, then recover it. */
7607 state = lgp->args.ctx->state;
7608 } else {
7609 LIST_HEAD(head);
7610
7611 /*
7612 * Mark the bad layout state as invalid, then retry
7613 * with the current stateid.
7614 */
7615 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7616 spin_unlock(&inode->i_lock);
7617 pnfs_free_lseg_list(&head);
7618
7619 task->tk_status = 0;
7620 rpc_restart_call_prepare(task);
7621 }
7622 }
7623 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7624 rpc_restart_call_prepare(task);
7625out:
7626 dprintk("<-- %s\n", __func__);
7627}
7628
7629static size_t max_response_pages(struct nfs_server *server)
7630{
7631 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7632 return nfs_page_array_len(0, max_resp_sz);
7633}
7634
7635static void nfs4_free_pages(struct page **pages, size_t size)
7636{
7637 int i;
7638
7639 if (!pages)
7640 return;
7641
7642 for (i = 0; i < size; i++) {
7643 if (!pages[i])
7644 break;
7645 __free_page(pages[i]);
7646 }
7647 kfree(pages);
7648}
7649
7650static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7651{
7652 struct page **pages;
7653 int i;
7654
7655 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7656 if (!pages) {
7657 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7658 return NULL;
7659 }
7660
7661 for (i = 0; i < size; i++) {
7662 pages[i] = alloc_page(gfp_flags);
7663 if (!pages[i]) {
7664 dprintk("%s: failed to allocate page\n", __func__);
7665 nfs4_free_pages(pages, size);
7666 return NULL;
7667 }
7668 }
7669
7670 return pages;
7671}
7672
7673static void nfs4_layoutget_release(void *calldata)
7674{
7675 struct nfs4_layoutget *lgp = calldata;
7676 struct inode *inode = lgp->args.inode;
7677 struct nfs_server *server = NFS_SERVER(inode);
7678 size_t max_pages = max_response_pages(server);
7679
7680 dprintk("--> %s\n", __func__);
7681 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7682 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7683 put_nfs_open_context(lgp->args.ctx);
7684 kfree(calldata);
7685 dprintk("<-- %s\n", __func__);
7686}
7687
7688static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7689 .rpc_call_prepare = nfs4_layoutget_prepare,
7690 .rpc_call_done = nfs4_layoutget_done,
7691 .rpc_release = nfs4_layoutget_release,
7692};
7693
7694struct pnfs_layout_segment *
7695nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7696{
7697 struct inode *inode = lgp->args.inode;
7698 struct nfs_server *server = NFS_SERVER(inode);
7699 size_t max_pages = max_response_pages(server);
7700 struct rpc_task *task;
7701 struct rpc_message msg = {
7702 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7703 .rpc_argp = &lgp->args,
7704 .rpc_resp = &lgp->res,
7705 .rpc_cred = lgp->cred,
7706 };
7707 struct rpc_task_setup task_setup_data = {
7708 .rpc_client = server->client,
7709 .rpc_message = &msg,
7710 .callback_ops = &nfs4_layoutget_call_ops,
7711 .callback_data = lgp,
7712 .flags = RPC_TASK_ASYNC,
7713 };
7714 struct pnfs_layout_segment *lseg = NULL;
7715 int status = 0;
7716
7717 dprintk("--> %s\n", __func__);
7718
7719 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7720 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7721
7722 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7723 if (!lgp->args.layout.pages) {
7724 nfs4_layoutget_release(lgp);
7725 return ERR_PTR(-ENOMEM);
7726 }
7727 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7728 lgp->args.timestamp = jiffies;
7729
7730 lgp->res.layoutp = &lgp->args.layout;
7731 lgp->res.seq_res.sr_slot = NULL;
7732 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7733
7734 task = rpc_run_task(&task_setup_data);
7735 if (IS_ERR(task))
7736 return ERR_CAST(task);
7737 status = nfs4_wait_for_completion_rpc_task(task);
7738 if (status == 0)
7739 status = task->tk_status;
7740 trace_nfs4_layoutget(lgp->args.ctx,
7741 &lgp->args.range,
7742 &lgp->res.range,
7743 status);
7744 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7745 if (status == 0 && lgp->res.layoutp->len)
7746 lseg = pnfs_layout_process(lgp);
7747 rpc_put_task(task);
7748 dprintk("<-- %s status=%d\n", __func__, status);
7749 if (status)
7750 return ERR_PTR(status);
7751 return lseg;
7752}
7753
7754static void
7755nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7756{
7757 struct nfs4_layoutreturn *lrp = calldata;
7758
7759 dprintk("--> %s\n", __func__);
7760 nfs41_setup_sequence(lrp->clp->cl_session,
7761 &lrp->args.seq_args,
7762 &lrp->res.seq_res,
7763 task);
7764}
7765
7766static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7767{
7768 struct nfs4_layoutreturn *lrp = calldata;
7769 struct nfs_server *server;
7770
7771 dprintk("--> %s\n", __func__);
7772
7773 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7774 return;
7775
7776 server = NFS_SERVER(lrp->args.inode);
7777 switch (task->tk_status) {
7778 default:
7779 task->tk_status = 0;
7780 case 0:
7781 break;
7782 case -NFS4ERR_DELAY:
7783 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7784 break;
7785 rpc_restart_call_prepare(task);
7786 return;
7787 }
7788 dprintk("<-- %s\n", __func__);
7789}
7790
7791static void nfs4_layoutreturn_release(void *calldata)
7792{
7793 struct nfs4_layoutreturn *lrp = calldata;
7794 struct pnfs_layout_hdr *lo = lrp->args.layout;
7795
7796 dprintk("--> %s\n", __func__);
7797 spin_lock(&lo->plh_inode->i_lock);
7798 if (lrp->res.lrs_present)
7799 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7800 lo->plh_block_lgets--;
7801 spin_unlock(&lo->plh_inode->i_lock);
7802 pnfs_put_layout_hdr(lrp->args.layout);
7803 kfree(calldata);
7804 dprintk("<-- %s\n", __func__);
7805}
7806
7807static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7808 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7809 .rpc_call_done = nfs4_layoutreturn_done,
7810 .rpc_release = nfs4_layoutreturn_release,
7811};
7812
7813int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7814{
7815 struct rpc_task *task;
7816 struct rpc_message msg = {
7817 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7818 .rpc_argp = &lrp->args,
7819 .rpc_resp = &lrp->res,
7820 .rpc_cred = lrp->cred,
7821 };
7822 struct rpc_task_setup task_setup_data = {
7823 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7824 .rpc_message = &msg,
7825 .callback_ops = &nfs4_layoutreturn_call_ops,
7826 .callback_data = lrp,
7827 };
7828 int status;
7829
7830 dprintk("--> %s\n", __func__);
7831 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7832 task = rpc_run_task(&task_setup_data);
7833 if (IS_ERR(task))
7834 return PTR_ERR(task);
7835 status = task->tk_status;
7836 trace_nfs4_layoutreturn(lrp->args.inode, status);
7837 dprintk("<-- %s status=%d\n", __func__, status);
7838 rpc_put_task(task);
7839 return status;
7840}
7841
7842static int
7843_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7844 struct pnfs_device *pdev,
7845 struct rpc_cred *cred)
7846{
7847 struct nfs4_getdeviceinfo_args args = {
7848 .pdev = pdev,
7849 };
7850 struct nfs4_getdeviceinfo_res res = {
7851 .pdev = pdev,
7852 };
7853 struct rpc_message msg = {
7854 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7855 .rpc_argp = &args,
7856 .rpc_resp = &res,
7857 .rpc_cred = cred,
7858 };
7859 int status;
7860
7861 dprintk("--> %s\n", __func__);
7862 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7863 dprintk("<-- %s status=%d\n", __func__, status);
7864
7865 return status;
7866}
7867
7868int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7869 struct pnfs_device *pdev,
7870 struct rpc_cred *cred)
7871{
7872 struct nfs4_exception exception = { };
7873 int err;
7874
7875 do {
7876 err = nfs4_handle_exception(server,
7877 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7878 &exception);
7879 } while (exception.retry);
7880 return err;
7881}
7882EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7883
7884static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7885{
7886 struct nfs4_layoutcommit_data *data = calldata;
7887 struct nfs_server *server = NFS_SERVER(data->args.inode);
7888 struct nfs4_session *session = nfs4_get_session(server);
7889
7890 nfs41_setup_sequence(session,
7891 &data->args.seq_args,
7892 &data->res.seq_res,
7893 task);
7894}
7895
7896static void
7897nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7898{
7899 struct nfs4_layoutcommit_data *data = calldata;
7900 struct nfs_server *server = NFS_SERVER(data->args.inode);
7901
7902 if (!nfs41_sequence_done(task, &data->res.seq_res))
7903 return;
7904
7905 switch (task->tk_status) { /* Just ignore these failures */
7906 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7907 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7908 case -NFS4ERR_BADLAYOUT: /* no layout */
7909 case -NFS4ERR_GRACE: /* loca_recalim always false */
7910 task->tk_status = 0;
7911 case 0:
7912 break;
7913 default:
7914 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7915 rpc_restart_call_prepare(task);
7916 return;
7917 }
7918 }
7919}
7920
7921static void nfs4_layoutcommit_release(void *calldata)
7922{
7923 struct nfs4_layoutcommit_data *data = calldata;
7924
7925 pnfs_cleanup_layoutcommit(data);
7926 nfs_post_op_update_inode_force_wcc(data->args.inode,
7927 data->res.fattr);
7928 put_rpccred(data->cred);
7929 kfree(data);
7930}
7931
7932static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7933 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7934 .rpc_call_done = nfs4_layoutcommit_done,
7935 .rpc_release = nfs4_layoutcommit_release,
7936};
7937
7938int
7939nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7940{
7941 struct rpc_message msg = {
7942 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7943 .rpc_argp = &data->args,
7944 .rpc_resp = &data->res,
7945 .rpc_cred = data->cred,
7946 };
7947 struct rpc_task_setup task_setup_data = {
7948 .task = &data->task,
7949 .rpc_client = NFS_CLIENT(data->args.inode),
7950 .rpc_message = &msg,
7951 .callback_ops = &nfs4_layoutcommit_ops,
7952 .callback_data = data,
7953 .flags = RPC_TASK_ASYNC,
7954 };
7955 struct rpc_task *task;
7956 int status = 0;
7957
7958 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7959 "lbw: %llu inode %lu\n",
7960 data->task.tk_pid, sync,
7961 data->args.lastbytewritten,
7962 data->args.inode->i_ino);
7963
7964 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7965 task = rpc_run_task(&task_setup_data);
7966 if (IS_ERR(task))
7967 return PTR_ERR(task);
7968 if (sync == false)
7969 goto out;
7970 status = nfs4_wait_for_completion_rpc_task(task);
7971 if (status != 0)
7972 goto out;
7973 status = task->tk_status;
7974 trace_nfs4_layoutcommit(data->args.inode, status);
7975out:
7976 dprintk("%s: status %d\n", __func__, status);
7977 rpc_put_task(task);
7978 return status;
7979}
7980
7981/**
7982 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7983 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7984 */
7985static int
7986_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7987 struct nfs_fsinfo *info,
7988 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7989{
7990 struct nfs41_secinfo_no_name_args args = {
7991 .style = SECINFO_STYLE_CURRENT_FH,
7992 };
7993 struct nfs4_secinfo_res res = {
7994 .flavors = flavors,
7995 };
7996 struct rpc_message msg = {
7997 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7998 .rpc_argp = &args,
7999 .rpc_resp = &res,
8000 };
8001 struct rpc_clnt *clnt = server->client;
8002 struct rpc_cred *cred = NULL;
8003 int status;
8004
8005 if (use_integrity) {
8006 clnt = server->nfs_client->cl_rpcclient;
8007 cred = nfs4_get_clid_cred(server->nfs_client);
8008 msg.rpc_cred = cred;
8009 }
8010
8011 dprintk("--> %s\n", __func__);
8012 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8013 &res.seq_res, 0);
8014 dprintk("<-- %s status=%d\n", __func__, status);
8015
8016 if (cred)
8017 put_rpccred(cred);
8018
8019 return status;
8020}
8021
8022static int
8023nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8024 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8025{
8026 struct nfs4_exception exception = { };
8027 int err;
8028 do {
8029 /* first try using integrity protection */
8030 err = -NFS4ERR_WRONGSEC;
8031
8032 /* try to use integrity protection with machine cred */
8033 if (_nfs4_is_integrity_protected(server->nfs_client))
8034 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8035 flavors, true);
8036
8037 /*
8038 * if unable to use integrity protection, or SECINFO with
8039 * integrity protection returns NFS4ERR_WRONGSEC (which is
8040 * disallowed by spec, but exists in deployed servers) use
8041 * the current filesystem's rpc_client and the user cred.
8042 */
8043 if (err == -NFS4ERR_WRONGSEC)
8044 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8045 flavors, false);
8046
8047 switch (err) {
8048 case 0:
8049 case -NFS4ERR_WRONGSEC:
8050 case -ENOTSUPP:
8051 goto out;
8052 default:
8053 err = nfs4_handle_exception(server, err, &exception);
8054 }
8055 } while (exception.retry);
8056out:
8057 return err;
8058}
8059
8060static int
8061nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8062 struct nfs_fsinfo *info)
8063{
8064 int err;
8065 struct page *page;
8066 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8067 struct nfs4_secinfo_flavors *flavors;
8068 struct nfs4_secinfo4 *secinfo;
8069 int i;
8070
8071 page = alloc_page(GFP_KERNEL);
8072 if (!page) {
8073 err = -ENOMEM;
8074 goto out;
8075 }
8076
8077 flavors = page_address(page);
8078 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8079
8080 /*
8081 * Fall back on "guess and check" method if
8082 * the server doesn't support SECINFO_NO_NAME
8083 */
8084 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8085 err = nfs4_find_root_sec(server, fhandle, info);
8086 goto out_freepage;
8087 }
8088 if (err)
8089 goto out_freepage;
8090
8091 for (i = 0; i < flavors->num_flavors; i++) {
8092 secinfo = &flavors->flavors[i];
8093
8094 switch (secinfo->flavor) {
8095 case RPC_AUTH_NULL:
8096 case RPC_AUTH_UNIX:
8097 case RPC_AUTH_GSS:
8098 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8099 &secinfo->flavor_info);
8100 break;
8101 default:
8102 flavor = RPC_AUTH_MAXFLAVOR;
8103 break;
8104 }
8105
8106 if (!nfs_auth_info_match(&server->auth_info, flavor))
8107 flavor = RPC_AUTH_MAXFLAVOR;
8108
8109 if (flavor != RPC_AUTH_MAXFLAVOR) {
8110 err = nfs4_lookup_root_sec(server, fhandle,
8111 info, flavor);
8112 if (!err)
8113 break;
8114 }
8115 }
8116
8117 if (flavor == RPC_AUTH_MAXFLAVOR)
8118 err = -EPERM;
8119
8120out_freepage:
8121 put_page(page);
8122 if (err == -EACCES)
8123 return -EPERM;
8124out:
8125 return err;
8126}
8127
8128static int _nfs41_test_stateid(struct nfs_server *server,
8129 nfs4_stateid *stateid,
8130 struct rpc_cred *cred)
8131{
8132 int status;
8133 struct nfs41_test_stateid_args args = {
8134 .stateid = stateid,
8135 };
8136 struct nfs41_test_stateid_res res;
8137 struct rpc_message msg = {
8138 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8139 .rpc_argp = &args,
8140 .rpc_resp = &res,
8141 .rpc_cred = cred,
8142 };
8143 struct rpc_clnt *rpc_client = server->client;
8144
8145 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8146 &rpc_client, &msg);
8147
8148 dprintk("NFS call test_stateid %p\n", stateid);
8149 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8150 nfs4_set_sequence_privileged(&args.seq_args);
8151 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8152 &args.seq_args, &res.seq_res);
8153 if (status != NFS_OK) {
8154 dprintk("NFS reply test_stateid: failed, %d\n", status);
8155 return status;
8156 }
8157 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8158 return -res.status;
8159}
8160
8161/**
8162 * nfs41_test_stateid - perform a TEST_STATEID operation
8163 *
8164 * @server: server / transport on which to perform the operation
8165 * @stateid: state ID to test
8166 * @cred: credential
8167 *
8168 * Returns NFS_OK if the server recognizes that "stateid" is valid.
8169 * Otherwise a negative NFS4ERR value is returned if the operation
8170 * failed or the state ID is not currently valid.
8171 */
8172static int nfs41_test_stateid(struct nfs_server *server,
8173 nfs4_stateid *stateid,
8174 struct rpc_cred *cred)
8175{
8176 struct nfs4_exception exception = { };
8177 int err;
8178 do {
8179 err = _nfs41_test_stateid(server, stateid, cred);
8180 if (err != -NFS4ERR_DELAY)
8181 break;
8182 nfs4_handle_exception(server, err, &exception);
8183 } while (exception.retry);
8184 return err;
8185}
8186
8187struct nfs_free_stateid_data {
8188 struct nfs_server *server;
8189 struct nfs41_free_stateid_args args;
8190 struct nfs41_free_stateid_res res;
8191};
8192
8193static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8194{
8195 struct nfs_free_stateid_data *data = calldata;
8196 nfs41_setup_sequence(nfs4_get_session(data->server),
8197 &data->args.seq_args,
8198 &data->res.seq_res,
8199 task);
8200}
8201
8202static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8203{
8204 struct nfs_free_stateid_data *data = calldata;
8205
8206 nfs41_sequence_done(task, &data->res.seq_res);
8207
8208 switch (task->tk_status) {
8209 case -NFS4ERR_DELAY:
8210 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8211 rpc_restart_call_prepare(task);
8212 }
8213}
8214
8215static void nfs41_free_stateid_release(void *calldata)
8216{
8217 kfree(calldata);
8218}
8219
8220static const struct rpc_call_ops nfs41_free_stateid_ops = {
8221 .rpc_call_prepare = nfs41_free_stateid_prepare,
8222 .rpc_call_done = nfs41_free_stateid_done,
8223 .rpc_release = nfs41_free_stateid_release,
8224};
8225
8226static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8227 nfs4_stateid *stateid,
8228 struct rpc_cred *cred,
8229 bool privileged)
8230{
8231 struct rpc_message msg = {
8232 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8233 .rpc_cred = cred,
8234 };
8235 struct rpc_task_setup task_setup = {
8236 .rpc_client = server->client,
8237 .rpc_message = &msg,
8238 .callback_ops = &nfs41_free_stateid_ops,
8239 .flags = RPC_TASK_ASYNC,
8240 };
8241 struct nfs_free_stateid_data *data;
8242
8243 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8244 &task_setup.rpc_client, &msg);
8245
8246 dprintk("NFS call free_stateid %p\n", stateid);
8247 data = kmalloc(sizeof(*data), GFP_NOFS);
8248 if (!data)
8249 return ERR_PTR(-ENOMEM);
8250 data->server = server;
8251 nfs4_stateid_copy(&data->args.stateid, stateid);
8252
8253 task_setup.callback_data = data;
8254
8255 msg.rpc_argp = &data->args;
8256 msg.rpc_resp = &data->res;
8257 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8258 if (privileged)
8259 nfs4_set_sequence_privileged(&data->args.seq_args);
8260
8261 return rpc_run_task(&task_setup);
8262}
8263
8264/**
8265 * nfs41_free_stateid - perform a FREE_STATEID operation
8266 *
8267 * @server: server / transport on which to perform the operation
8268 * @stateid: state ID to release
8269 * @cred: credential
8270 *
8271 * Returns NFS_OK if the server freed "stateid". Otherwise a
8272 * negative NFS4ERR value is returned.
8273 */
8274static int nfs41_free_stateid(struct nfs_server *server,
8275 nfs4_stateid *stateid,
8276 struct rpc_cred *cred)
8277{
8278 struct rpc_task *task;
8279 int ret;
8280
8281 task = _nfs41_free_stateid(server, stateid, cred, true);
8282 if (IS_ERR(task))
8283 return PTR_ERR(task);
8284 ret = rpc_wait_for_completion_task(task);
8285 if (!ret)
8286 ret = task->tk_status;
8287 rpc_put_task(task);
8288 return ret;
8289}
8290
8291static void
8292nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8293{
8294 struct rpc_task *task;
8295 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8296
8297 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8298 nfs4_free_lock_state(server, lsp);
8299 if (IS_ERR(task))
8300 return;
8301 rpc_put_task(task);
8302}
8303
8304static bool nfs41_match_stateid(const nfs4_stateid *s1,
8305 const nfs4_stateid *s2)
8306{
8307 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8308 return false;
8309
8310 if (s1->seqid == s2->seqid)
8311 return true;
8312 if (s1->seqid == 0 || s2->seqid == 0)
8313 return true;
8314
8315 return false;
8316}
8317
8318#endif /* CONFIG_NFS_V4_1 */
8319
8320static bool nfs4_match_stateid(const nfs4_stateid *s1,
8321 const nfs4_stateid *s2)
8322{
8323 return nfs4_stateid_match(s1, s2);
8324}
8325
8326
8327static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8328 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8329 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8330 .recover_open = nfs4_open_reclaim,
8331 .recover_lock = nfs4_lock_reclaim,
8332 .establish_clid = nfs4_init_clientid,
8333 .detect_trunking = nfs40_discover_server_trunking,
8334};
8335
8336#if defined(CONFIG_NFS_V4_1)
8337static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8338 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8339 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8340 .recover_open = nfs4_open_reclaim,
8341 .recover_lock = nfs4_lock_reclaim,
8342 .establish_clid = nfs41_init_clientid,
8343 .reclaim_complete = nfs41_proc_reclaim_complete,
8344 .detect_trunking = nfs41_discover_server_trunking,
8345};
8346#endif /* CONFIG_NFS_V4_1 */
8347
8348static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8349 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8350 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8351 .recover_open = nfs40_open_expired,
8352 .recover_lock = nfs4_lock_expired,
8353 .establish_clid = nfs4_init_clientid,
8354};
8355
8356#if defined(CONFIG_NFS_V4_1)
8357static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8358 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8359 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8360 .recover_open = nfs41_open_expired,
8361 .recover_lock = nfs41_lock_expired,
8362 .establish_clid = nfs41_init_clientid,
8363};
8364#endif /* CONFIG_NFS_V4_1 */
8365
8366static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8367 .sched_state_renewal = nfs4_proc_async_renew,
8368 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8369 .renew_lease = nfs4_proc_renew,
8370};
8371
8372#if defined(CONFIG_NFS_V4_1)
8373static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8374 .sched_state_renewal = nfs41_proc_async_sequence,
8375 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8376 .renew_lease = nfs4_proc_sequence,
8377};
8378#endif
8379
8380static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8381 .get_locations = _nfs40_proc_get_locations,
8382 .fsid_present = _nfs40_proc_fsid_present,
8383};
8384
8385#if defined(CONFIG_NFS_V4_1)
8386static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8387 .get_locations = _nfs41_proc_get_locations,
8388 .fsid_present = _nfs41_proc_fsid_present,
8389};
8390#endif /* CONFIG_NFS_V4_1 */
8391
8392static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8393 .minor_version = 0,
8394 .init_caps = NFS_CAP_READDIRPLUS
8395 | NFS_CAP_ATOMIC_OPEN
8396 | NFS_CAP_CHANGE_ATTR
8397 | NFS_CAP_POSIX_LOCK,
8398 .init_client = nfs40_init_client,
8399 .shutdown_client = nfs40_shutdown_client,
8400 .match_stateid = nfs4_match_stateid,
8401 .find_root_sec = nfs4_find_root_sec,
8402 .free_lock_state = nfs4_release_lockowner,
8403 .call_sync_ops = &nfs40_call_sync_ops,
8404 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8405 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8406 .state_renewal_ops = &nfs40_state_renewal_ops,
8407 .mig_recovery_ops = &nfs40_mig_recovery_ops,
8408};
8409
8410#if defined(CONFIG_NFS_V4_1)
8411static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8412 .minor_version = 1,
8413 .init_caps = NFS_CAP_READDIRPLUS
8414 | NFS_CAP_ATOMIC_OPEN
8415 | NFS_CAP_CHANGE_ATTR
8416 | NFS_CAP_POSIX_LOCK
8417 | NFS_CAP_STATEID_NFSV41
8418 | NFS_CAP_ATOMIC_OPEN_V1,
8419 .init_client = nfs41_init_client,
8420 .shutdown_client = nfs41_shutdown_client,
8421 .match_stateid = nfs41_match_stateid,
8422 .find_root_sec = nfs41_find_root_sec,
8423 .free_lock_state = nfs41_free_lock_state,
8424 .call_sync_ops = &nfs41_call_sync_ops,
8425 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8426 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8427 .state_renewal_ops = &nfs41_state_renewal_ops,
8428 .mig_recovery_ops = &nfs41_mig_recovery_ops,
8429};
8430#endif
8431
8432#if defined(CONFIG_NFS_V4_2)
8433static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8434 .minor_version = 2,
8435 .init_caps = NFS_CAP_READDIRPLUS
8436 | NFS_CAP_ATOMIC_OPEN
8437 | NFS_CAP_CHANGE_ATTR
8438 | NFS_CAP_POSIX_LOCK
8439 | NFS_CAP_STATEID_NFSV41
8440 | NFS_CAP_ATOMIC_OPEN_V1
8441 | NFS_CAP_ALLOCATE
8442 | NFS_CAP_DEALLOCATE
8443 | NFS_CAP_SEEK,
8444 .init_client = nfs41_init_client,
8445 .shutdown_client = nfs41_shutdown_client,
8446 .match_stateid = nfs41_match_stateid,
8447 .find_root_sec = nfs41_find_root_sec,
8448 .free_lock_state = nfs41_free_lock_state,
8449 .call_sync_ops = &nfs41_call_sync_ops,
8450 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8451 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8452 .state_renewal_ops = &nfs41_state_renewal_ops,
8453};
8454#endif
8455
8456const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8457 [0] = &nfs_v4_0_minor_ops,
8458#if defined(CONFIG_NFS_V4_1)
8459 [1] = &nfs_v4_1_minor_ops,
8460#endif
8461#if defined(CONFIG_NFS_V4_2)
8462 [2] = &nfs_v4_2_minor_ops,
8463#endif
8464};
8465
8466static const struct inode_operations nfs4_dir_inode_operations = {
8467 .create = nfs_create,
8468 .lookup = nfs_lookup,
8469 .atomic_open = nfs_atomic_open,
8470 .link = nfs_link,
8471 .unlink = nfs_unlink,
8472 .symlink = nfs_symlink,
8473 .mkdir = nfs_mkdir,
8474 .rmdir = nfs_rmdir,
8475 .mknod = nfs_mknod,
8476 .rename = nfs_rename,
8477 .permission = nfs_permission,
8478 .getattr = nfs_getattr,
8479 .setattr = nfs_setattr,
8480 .getxattr = generic_getxattr,
8481 .setxattr = generic_setxattr,
8482 .listxattr = generic_listxattr,
8483 .removexattr = generic_removexattr,
8484};
8485
8486static const struct inode_operations nfs4_file_inode_operations = {
8487 .permission = nfs_permission,
8488 .getattr = nfs_getattr,
8489 .setattr = nfs_setattr,
8490 .getxattr = generic_getxattr,
8491 .setxattr = generic_setxattr,
8492 .listxattr = generic_listxattr,
8493 .removexattr = generic_removexattr,
8494};
8495
8496const struct nfs_rpc_ops nfs_v4_clientops = {
8497 .version = 4, /* protocol version */
8498 .dentry_ops = &nfs4_dentry_operations,
8499 .dir_inode_ops = &nfs4_dir_inode_operations,
8500 .file_inode_ops = &nfs4_file_inode_operations,
8501 .file_ops = &nfs4_file_operations,
8502 .getroot = nfs4_proc_get_root,
8503 .submount = nfs4_submount,
8504 .try_mount = nfs4_try_mount,
8505 .getattr = nfs4_proc_getattr,
8506 .setattr = nfs4_proc_setattr,
8507 .lookup = nfs4_proc_lookup,
8508 .access = nfs4_proc_access,
8509 .readlink = nfs4_proc_readlink,
8510 .create = nfs4_proc_create,
8511 .remove = nfs4_proc_remove,
8512 .unlink_setup = nfs4_proc_unlink_setup,
8513 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8514 .unlink_done = nfs4_proc_unlink_done,
8515 .rename_setup = nfs4_proc_rename_setup,
8516 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8517 .rename_done = nfs4_proc_rename_done,
8518 .link = nfs4_proc_link,
8519 .symlink = nfs4_proc_symlink,
8520 .mkdir = nfs4_proc_mkdir,
8521 .rmdir = nfs4_proc_remove,
8522 .readdir = nfs4_proc_readdir,
8523 .mknod = nfs4_proc_mknod,
8524 .statfs = nfs4_proc_statfs,
8525 .fsinfo = nfs4_proc_fsinfo,
8526 .pathconf = nfs4_proc_pathconf,
8527 .set_capabilities = nfs4_server_capabilities,
8528 .decode_dirent = nfs4_decode_dirent,
8529 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8530 .read_setup = nfs4_proc_read_setup,
8531 .read_done = nfs4_read_done,
8532 .write_setup = nfs4_proc_write_setup,
8533 .write_done = nfs4_write_done,
8534 .commit_setup = nfs4_proc_commit_setup,
8535 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8536 .commit_done = nfs4_commit_done,
8537 .lock = nfs4_proc_lock,
8538 .clear_acl_cache = nfs4_zap_acl_attr,
8539 .close_context = nfs4_close_context,
8540 .open_context = nfs4_atomic_open,
8541 .have_delegation = nfs4_have_delegation,
8542 .return_delegation = nfs4_inode_return_delegation,
8543 .alloc_client = nfs4_alloc_client,
8544 .init_client = nfs4_init_client,
8545 .free_client = nfs4_free_client,
8546 .create_server = nfs4_create_server,
8547 .clone_server = nfs_clone_server,
8548};
8549
8550static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8551 .prefix = XATTR_NAME_NFSV4_ACL,
8552 .list = nfs4_xattr_list_nfs4_acl,
8553 .get = nfs4_xattr_get_nfs4_acl,
8554 .set = nfs4_xattr_set_nfs4_acl,
8555};
8556
8557const struct xattr_handler *nfs4_xattr_handlers[] = {
8558 &nfs4_xattr_nfs4_acl_handler,
8559#ifdef CONFIG_NFS_V4_SECURITY_LABEL
8560 &nfs4_xattr_nfs4_label_handler,
8561#endif
8562 NULL
8563};
8564
8565/*
8566 * Local variables:
8567 * c-basic-offset: 8
8568 * End:
8569 */
Linux 6.x block layer and io_uring tree(s)