projects / linux-2.6-block.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
NFS: Add Anna Schumaker as co-maintainer for the NFS client
[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
498int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
499 struct nfs4_sequence_args *args,
500 struct nfs4_sequence_res *res,
501 struct rpc_task *task)
502{
503 struct nfs4_slot *slot;
504
505 /* slot already allocated? */
506 if (res->sr_slot != NULL)
507 goto out_start;
508
509 spin_lock(&tbl->slot_tbl_lock);
510 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
511 goto out_sleep;
512
513 slot = nfs4_alloc_slot(tbl);
514 if (IS_ERR(slot)) {
515 if (slot == ERR_PTR(-ENOMEM))
516 task->tk_timeout = HZ >> 2;
517 goto out_sleep;
518 }
519 spin_unlock(&tbl->slot_tbl_lock);
520
521 args->sa_slot = slot;
522 res->sr_slot = slot;
523
524out_start:
525 rpc_call_start(task);
526 return 0;
527
528out_sleep:
529 if (args->sa_privileged)
530 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
531 NULL, RPC_PRIORITY_PRIVILEGED);
532 else
533 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
534 spin_unlock(&tbl->slot_tbl_lock);
535 return -EAGAIN;
536}
537EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
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
697int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
698{
699 if (res->sr_slot == NULL)
700 return 1;
701 if (!res->sr_slot->table->session)
702 return nfs40_sequence_done(task, res);
703 return nfs41_sequence_done(task, res);
704}
705EXPORT_SYMBOL_GPL(nfs4_sequence_done);
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->nfs_client->cl_slot_tbl,
781 args, res, task);
782
783 dprintk("--> %s clp %p session %p sr_slot %u\n",
784 __func__, session->clp, session, res->sr_slot ?
785 res->sr_slot->slot_nr : NFS4_NO_SLOT);
786
787 ret = nfs41_setup_sequence(session, args, res, task);
788
789 dprintk("<-- %s status=%d\n", __func__, ret);
790 return ret;
791}
792
793static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
794{
795 struct nfs4_call_sync_data *data = calldata;
796 struct nfs4_session *session = nfs4_get_session(data->seq_server);
797
798 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
799
800 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
801}
802
803static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
804{
805 struct nfs4_call_sync_data *data = calldata;
806
807 nfs41_sequence_done(task, data->seq_res);
808}
809
810static const struct rpc_call_ops nfs41_call_sync_ops = {
811 .rpc_call_prepare = nfs41_call_sync_prepare,
812 .rpc_call_done = nfs41_call_sync_done,
813};
814
815#else /* !CONFIG_NFS_V4_1 */
816
817static int nfs4_setup_sequence(const struct nfs_server *server,
818 struct nfs4_sequence_args *args,
819 struct nfs4_sequence_res *res,
820 struct rpc_task *task)
821{
822 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
823 args, res, task);
824}
825
826int nfs4_sequence_done(struct rpc_task *task,
827 struct nfs4_sequence_res *res)
828{
829 return nfs40_sequence_done(task, res);
830}
831EXPORT_SYMBOL_GPL(nfs4_sequence_done);
832
833#endif /* !CONFIG_NFS_V4_1 */
834
835static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
836{
837 struct nfs4_call_sync_data *data = calldata;
838 nfs4_setup_sequence(data->seq_server,
839 data->seq_args, data->seq_res, task);
840}
841
842static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
843{
844 struct nfs4_call_sync_data *data = calldata;
845 nfs4_sequence_done(task, data->seq_res);
846}
847
848static const struct rpc_call_ops nfs40_call_sync_ops = {
849 .rpc_call_prepare = nfs40_call_sync_prepare,
850 .rpc_call_done = nfs40_call_sync_done,
851};
852
853static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
854 struct nfs_server *server,
855 struct rpc_message *msg,
856 struct nfs4_sequence_args *args,
857 struct nfs4_sequence_res *res)
858{
859 int ret;
860 struct rpc_task *task;
861 struct nfs_client *clp = server->nfs_client;
862 struct nfs4_call_sync_data data = {
863 .seq_server = server,
864 .seq_args = args,
865 .seq_res = res,
866 };
867 struct rpc_task_setup task_setup = {
868 .rpc_client = clnt,
869 .rpc_message = msg,
870 .callback_ops = clp->cl_mvops->call_sync_ops,
871 .callback_data = &data
872 };
873
874 task = rpc_run_task(&task_setup);
875 if (IS_ERR(task))
876 ret = PTR_ERR(task);
877 else {
878 ret = task->tk_status;
879 rpc_put_task(task);
880 }
881 return ret;
882}
883
884int nfs4_call_sync(struct rpc_clnt *clnt,
885 struct nfs_server *server,
886 struct rpc_message *msg,
887 struct nfs4_sequence_args *args,
888 struct nfs4_sequence_res *res,
889 int cache_reply)
890{
891 nfs4_init_sequence(args, res, cache_reply);
892 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
893}
894
895static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
896{
897 struct nfs_inode *nfsi = NFS_I(dir);
898
899 spin_lock(&dir->i_lock);
900 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
901 if (!cinfo->atomic || cinfo->before != dir->i_version)
902 nfs_force_lookup_revalidate(dir);
903 dir->i_version = cinfo->after;
904 nfs_fscache_invalidate(dir);
905 spin_unlock(&dir->i_lock);
906}
907
908struct nfs4_opendata {
909 struct kref kref;
910 struct nfs_openargs o_arg;
911 struct nfs_openres o_res;
912 struct nfs_open_confirmargs c_arg;
913 struct nfs_open_confirmres c_res;
914 struct nfs4_string owner_name;
915 struct nfs4_string group_name;
916 struct nfs_fattr f_attr;
917 struct nfs4_label *f_label;
918 struct dentry *dir;
919 struct dentry *dentry;
920 struct nfs4_state_owner *owner;
921 struct nfs4_state *state;
922 struct iattr attrs;
923 unsigned long timestamp;
924 unsigned int rpc_done : 1;
925 unsigned int file_created : 1;
926 unsigned int is_recover : 1;
927 int rpc_status;
928 int cancelled;
929};
930
931static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
932 int err, struct nfs4_exception *exception)
933{
934 if (err != -EINVAL)
935 return false;
936 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
937 return false;
938 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
939 exception->retry = 1;
940 return true;
941}
942
943static enum open_claim_type4
944nfs4_map_atomic_open_claim(struct nfs_server *server,
945 enum open_claim_type4 claim)
946{
947 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
948 return claim;
949 switch (claim) {
950 default:
951 return claim;
952 case NFS4_OPEN_CLAIM_FH:
953 return NFS4_OPEN_CLAIM_NULL;
954 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
955 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
956 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
957 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
958 }
959}
960
961static void nfs4_init_opendata_res(struct nfs4_opendata *p)
962{
963 p->o_res.f_attr = &p->f_attr;
964 p->o_res.f_label = p->f_label;
965 p->o_res.seqid = p->o_arg.seqid;
966 p->c_res.seqid = p->c_arg.seqid;
967 p->o_res.server = p->o_arg.server;
968 p->o_res.access_request = p->o_arg.access;
969 nfs_fattr_init(&p->f_attr);
970 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
971}
972
973static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
974 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
975 const struct iattr *attrs,
976 struct nfs4_label *label,
977 enum open_claim_type4 claim,
978 gfp_t gfp_mask)
979{
980 struct dentry *parent = dget_parent(dentry);
981 struct inode *dir = parent->d_inode;
982 struct nfs_server *server = NFS_SERVER(dir);
983 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
984 struct nfs4_opendata *p;
985
986 p = kzalloc(sizeof(*p), gfp_mask);
987 if (p == NULL)
988 goto err;
989
990 p->f_label = nfs4_label_alloc(server, gfp_mask);
991 if (IS_ERR(p->f_label))
992 goto err_free_p;
993
994 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
995 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
996 if (IS_ERR(p->o_arg.seqid))
997 goto err_free_label;
998 nfs_sb_active(dentry->d_sb);
999 p->dentry = dget(dentry);
1000 p->dir = parent;
1001 p->owner = sp;
1002 atomic_inc(&sp->so_count);
1003 p->o_arg.open_flags = flags;
1004 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1005 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1006 * will return permission denied for all bits until close */
1007 if (!(flags & O_EXCL)) {
1008 /* ask server to check for all possible rights as results
1009 * are cached */
1010 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1011 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1012 }
1013 p->o_arg.clientid = server->nfs_client->cl_clientid;
1014 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1015 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1016 p->o_arg.name = &dentry->d_name;
1017 p->o_arg.server = server;
1018 p->o_arg.bitmask = nfs4_bitmask(server, label);
1019 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1020 p->o_arg.label = label;
1021 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1022 switch (p->o_arg.claim) {
1023 case NFS4_OPEN_CLAIM_NULL:
1024 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1025 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1026 p->o_arg.fh = NFS_FH(dir);
1027 break;
1028 case NFS4_OPEN_CLAIM_PREVIOUS:
1029 case NFS4_OPEN_CLAIM_FH:
1030 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1031 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1032 p->o_arg.fh = NFS_FH(dentry->d_inode);
1033 }
1034 if (attrs != NULL && attrs->ia_valid != 0) {
1035 __u32 verf[2];
1036
1037 p->o_arg.u.attrs = &p->attrs;
1038 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1039
1040 verf[0] = jiffies;
1041 verf[1] = current->pid;
1042 memcpy(p->o_arg.u.verifier.data, verf,
1043 sizeof(p->o_arg.u.verifier.data));
1044 }
1045 p->c_arg.fh = &p->o_res.fh;
1046 p->c_arg.stateid = &p->o_res.stateid;
1047 p->c_arg.seqid = p->o_arg.seqid;
1048 nfs4_init_opendata_res(p);
1049 kref_init(&p->kref);
1050 return p;
1051
1052err_free_label:
1053 nfs4_label_free(p->f_label);
1054err_free_p:
1055 kfree(p);
1056err:
1057 dput(parent);
1058 return NULL;
1059}
1060
1061static void nfs4_opendata_free(struct kref *kref)
1062{
1063 struct nfs4_opendata *p = container_of(kref,
1064 struct nfs4_opendata, kref);
1065 struct super_block *sb = p->dentry->d_sb;
1066
1067 nfs_free_seqid(p->o_arg.seqid);
1068 if (p->state != NULL)
1069 nfs4_put_open_state(p->state);
1070 nfs4_put_state_owner(p->owner);
1071
1072 nfs4_label_free(p->f_label);
1073
1074 dput(p->dir);
1075 dput(p->dentry);
1076 nfs_sb_deactive(sb);
1077 nfs_fattr_free_names(&p->f_attr);
1078 kfree(p->f_attr.mdsthreshold);
1079 kfree(p);
1080}
1081
1082static void nfs4_opendata_put(struct nfs4_opendata *p)
1083{
1084 if (p != NULL)
1085 kref_put(&p->kref, nfs4_opendata_free);
1086}
1087
1088static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1089{
1090 int ret;
1091
1092 ret = rpc_wait_for_completion_task(task);
1093 return ret;
1094}
1095
1096static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1097{
1098 int ret = 0;
1099
1100 if (open_mode & (O_EXCL|O_TRUNC))
1101 goto out;
1102 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1103 case FMODE_READ:
1104 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1105 && state->n_rdonly != 0;
1106 break;
1107 case FMODE_WRITE:
1108 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1109 && state->n_wronly != 0;
1110 break;
1111 case FMODE_READ|FMODE_WRITE:
1112 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1113 && state->n_rdwr != 0;
1114 }
1115out:
1116 return ret;
1117}
1118
1119static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1120{
1121 if (delegation == NULL)
1122 return 0;
1123 if ((delegation->type & fmode) != fmode)
1124 return 0;
1125 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1126 return 0;
1127 nfs_mark_delegation_referenced(delegation);
1128 return 1;
1129}
1130
1131static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1132{
1133 switch (fmode) {
1134 case FMODE_WRITE:
1135 state->n_wronly++;
1136 break;
1137 case FMODE_READ:
1138 state->n_rdonly++;
1139 break;
1140 case FMODE_READ|FMODE_WRITE:
1141 state->n_rdwr++;
1142 }
1143 nfs4_state_set_mode_locked(state, state->state | fmode);
1144}
1145
1146static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1147{
1148 struct nfs_client *clp = state->owner->so_server->nfs_client;
1149 bool need_recover = false;
1150
1151 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1152 need_recover = true;
1153 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1154 need_recover = true;
1155 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1156 need_recover = true;
1157 if (need_recover)
1158 nfs4_state_mark_reclaim_nograce(clp, state);
1159}
1160
1161static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1162 nfs4_stateid *stateid)
1163{
1164 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1165 return true;
1166 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1167 nfs_test_and_clear_all_open_stateid(state);
1168 return true;
1169 }
1170 if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1171 return true;
1172 return false;
1173}
1174
1175static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1176{
1177 if (state->n_wronly)
1178 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1179 if (state->n_rdonly)
1180 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1181 if (state->n_rdwr)
1182 set_bit(NFS_O_RDWR_STATE, &state->flags);
1183}
1184
1185static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1186 nfs4_stateid *stateid, fmode_t fmode)
1187{
1188 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1189 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1190 case FMODE_WRITE:
1191 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1192 break;
1193 case FMODE_READ:
1194 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1195 break;
1196 case 0:
1197 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1198 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1199 clear_bit(NFS_OPEN_STATE, &state->flags);
1200 }
1201 if (stateid == NULL)
1202 return;
1203 /* Handle races with OPEN */
1204 if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
1205 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1206 nfs_resync_open_stateid_locked(state);
1207 return;
1208 }
1209 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1210 nfs4_stateid_copy(&state->stateid, stateid);
1211 nfs4_stateid_copy(&state->open_stateid, stateid);
1212}
1213
1214static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1215{
1216 write_seqlock(&state->seqlock);
1217 nfs_clear_open_stateid_locked(state, stateid, fmode);
1218 write_sequnlock(&state->seqlock);
1219 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1220 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1221}
1222
1223static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1224{
1225 switch (fmode) {
1226 case FMODE_READ:
1227 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1228 break;
1229 case FMODE_WRITE:
1230 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1231 break;
1232 case FMODE_READ|FMODE_WRITE:
1233 set_bit(NFS_O_RDWR_STATE, &state->flags);
1234 }
1235 if (!nfs_need_update_open_stateid(state, stateid))
1236 return;
1237 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1238 nfs4_stateid_copy(&state->stateid, stateid);
1239 nfs4_stateid_copy(&state->open_stateid, stateid);
1240}
1241
1242static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1243{
1244 /*
1245 * Protect the call to nfs4_state_set_mode_locked and
1246 * serialise the stateid update
1247 */
1248 write_seqlock(&state->seqlock);
1249 if (deleg_stateid != NULL) {
1250 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1251 set_bit(NFS_DELEGATED_STATE, &state->flags);
1252 }
1253 if (open_stateid != NULL)
1254 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1255 write_sequnlock(&state->seqlock);
1256 spin_lock(&state->owner->so_lock);
1257 update_open_stateflags(state, fmode);
1258 spin_unlock(&state->owner->so_lock);
1259}
1260
1261static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1262{
1263 struct nfs_inode *nfsi = NFS_I(state->inode);
1264 struct nfs_delegation *deleg_cur;
1265 int ret = 0;
1266
1267 fmode &= (FMODE_READ|FMODE_WRITE);
1268
1269 rcu_read_lock();
1270 deleg_cur = rcu_dereference(nfsi->delegation);
1271 if (deleg_cur == NULL)
1272 goto no_delegation;
1273
1274 spin_lock(&deleg_cur->lock);
1275 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1276 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1277 (deleg_cur->type & fmode) != fmode)
1278 goto no_delegation_unlock;
1279
1280 if (delegation == NULL)
1281 delegation = &deleg_cur->stateid;
1282 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1283 goto no_delegation_unlock;
1284
1285 nfs_mark_delegation_referenced(deleg_cur);
1286 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1287 ret = 1;
1288no_delegation_unlock:
1289 spin_unlock(&deleg_cur->lock);
1290no_delegation:
1291 rcu_read_unlock();
1292
1293 if (!ret && open_stateid != NULL) {
1294 __update_open_stateid(state, open_stateid, NULL, fmode);
1295 ret = 1;
1296 }
1297 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1298 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1299
1300 return ret;
1301}
1302
1303static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1304 const nfs4_stateid *stateid)
1305{
1306 struct nfs4_state *state = lsp->ls_state;
1307 bool ret = false;
1308
1309 spin_lock(&state->state_lock);
1310 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1311 goto out_noupdate;
1312 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1313 goto out_noupdate;
1314 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1315 ret = true;
1316out_noupdate:
1317 spin_unlock(&state->state_lock);
1318 return ret;
1319}
1320
1321static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1322{
1323 struct nfs_delegation *delegation;
1324
1325 rcu_read_lock();
1326 delegation = rcu_dereference(NFS_I(inode)->delegation);
1327 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1328 rcu_read_unlock();
1329 return;
1330 }
1331 rcu_read_unlock();
1332 nfs4_inode_return_delegation(inode);
1333}
1334
1335static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1336{
1337 struct nfs4_state *state = opendata->state;
1338 struct nfs_inode *nfsi = NFS_I(state->inode);
1339 struct nfs_delegation *delegation;
1340 int open_mode = opendata->o_arg.open_flags;
1341 fmode_t fmode = opendata->o_arg.fmode;
1342 nfs4_stateid stateid;
1343 int ret = -EAGAIN;
1344
1345 for (;;) {
1346 spin_lock(&state->owner->so_lock);
1347 if (can_open_cached(state, fmode, open_mode)) {
1348 update_open_stateflags(state, fmode);
1349 spin_unlock(&state->owner->so_lock);
1350 goto out_return_state;
1351 }
1352 spin_unlock(&state->owner->so_lock);
1353 rcu_read_lock();
1354 delegation = rcu_dereference(nfsi->delegation);
1355 if (!can_open_delegated(delegation, fmode)) {
1356 rcu_read_unlock();
1357 break;
1358 }
1359 /* Save the delegation */
1360 nfs4_stateid_copy(&stateid, &delegation->stateid);
1361 rcu_read_unlock();
1362 nfs_release_seqid(opendata->o_arg.seqid);
1363 if (!opendata->is_recover) {
1364 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1365 if (ret != 0)
1366 goto out;
1367 }
1368 ret = -EAGAIN;
1369
1370 /* Try to update the stateid using the delegation */
1371 if (update_open_stateid(state, NULL, &stateid, fmode))
1372 goto out_return_state;
1373 }
1374out:
1375 return ERR_PTR(ret);
1376out_return_state:
1377 atomic_inc(&state->count);
1378 return state;
1379}
1380
1381static void
1382nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1383{
1384 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1385 struct nfs_delegation *delegation;
1386 int delegation_flags = 0;
1387
1388 rcu_read_lock();
1389 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1390 if (delegation)
1391 delegation_flags = delegation->flags;
1392 rcu_read_unlock();
1393 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1394 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1395 "returning a delegation for "
1396 "OPEN(CLAIM_DELEGATE_CUR)\n",
1397 clp->cl_hostname);
1398 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1399 nfs_inode_set_delegation(state->inode,
1400 data->owner->so_cred,
1401 &data->o_res);
1402 else
1403 nfs_inode_reclaim_delegation(state->inode,
1404 data->owner->so_cred,
1405 &data->o_res);
1406}
1407
1408/*
1409 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1410 * and update the nfs4_state.
1411 */
1412static struct nfs4_state *
1413_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1414{
1415 struct inode *inode = data->state->inode;
1416 struct nfs4_state *state = data->state;
1417 int ret;
1418
1419 if (!data->rpc_done) {
1420 if (data->rpc_status) {
1421 ret = data->rpc_status;
1422 goto err;
1423 }
1424 /* cached opens have already been processed */
1425 goto update;
1426 }
1427
1428 ret = nfs_refresh_inode(inode, &data->f_attr);
1429 if (ret)
1430 goto err;
1431
1432 if (data->o_res.delegation_type != 0)
1433 nfs4_opendata_check_deleg(data, state);
1434update:
1435 update_open_stateid(state, &data->o_res.stateid, NULL,
1436 data->o_arg.fmode);
1437 atomic_inc(&state->count);
1438
1439 return state;
1440err:
1441 return ERR_PTR(ret);
1442
1443}
1444
1445static struct nfs4_state *
1446_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1447{
1448 struct inode *inode;
1449 struct nfs4_state *state = NULL;
1450 int ret;
1451
1452 if (!data->rpc_done) {
1453 state = nfs4_try_open_cached(data);
1454 goto out;
1455 }
1456
1457 ret = -EAGAIN;
1458 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1459 goto err;
1460 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1461 ret = PTR_ERR(inode);
1462 if (IS_ERR(inode))
1463 goto err;
1464 ret = -ENOMEM;
1465 state = nfs4_get_open_state(inode, data->owner);
1466 if (state == NULL)
1467 goto err_put_inode;
1468 if (data->o_res.delegation_type != 0)
1469 nfs4_opendata_check_deleg(data, state);
1470 update_open_stateid(state, &data->o_res.stateid, NULL,
1471 data->o_arg.fmode);
1472 iput(inode);
1473out:
1474 nfs_release_seqid(data->o_arg.seqid);
1475 return state;
1476err_put_inode:
1477 iput(inode);
1478err:
1479 return ERR_PTR(ret);
1480}
1481
1482static struct nfs4_state *
1483nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1484{
1485 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1486 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1487 return _nfs4_opendata_to_nfs4_state(data);
1488}
1489
1490static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1491{
1492 struct nfs_inode *nfsi = NFS_I(state->inode);
1493 struct nfs_open_context *ctx;
1494
1495 spin_lock(&state->inode->i_lock);
1496 list_for_each_entry(ctx, &nfsi->open_files, list) {
1497 if (ctx->state != state)
1498 continue;
1499 get_nfs_open_context(ctx);
1500 spin_unlock(&state->inode->i_lock);
1501 return ctx;
1502 }
1503 spin_unlock(&state->inode->i_lock);
1504 return ERR_PTR(-ENOENT);
1505}
1506
1507static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1508 struct nfs4_state *state, enum open_claim_type4 claim)
1509{
1510 struct nfs4_opendata *opendata;
1511
1512 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1513 NULL, NULL, claim, GFP_NOFS);
1514 if (opendata == NULL)
1515 return ERR_PTR(-ENOMEM);
1516 opendata->state = state;
1517 atomic_inc(&state->count);
1518 return opendata;
1519}
1520
1521static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1522{
1523 struct nfs4_state *newstate;
1524 int ret;
1525
1526 opendata->o_arg.open_flags = 0;
1527 opendata->o_arg.fmode = fmode;
1528 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1529 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1530 nfs4_init_opendata_res(opendata);
1531 ret = _nfs4_recover_proc_open(opendata);
1532 if (ret != 0)
1533 return ret;
1534 newstate = nfs4_opendata_to_nfs4_state(opendata);
1535 if (IS_ERR(newstate))
1536 return PTR_ERR(newstate);
1537 nfs4_close_state(newstate, fmode);
1538 *res = newstate;
1539 return 0;
1540}
1541
1542static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1543{
1544 struct nfs4_state *newstate;
1545 int ret;
1546
1547 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1548 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1549 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1550 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1551 /* memory barrier prior to reading state->n_* */
1552 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1553 clear_bit(NFS_OPEN_STATE, &state->flags);
1554 smp_rmb();
1555 if (state->n_rdwr != 0) {
1556 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1557 if (ret != 0)
1558 return ret;
1559 if (newstate != state)
1560 return -ESTALE;
1561 }
1562 if (state->n_wronly != 0) {
1563 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1564 if (ret != 0)
1565 return ret;
1566 if (newstate != state)
1567 return -ESTALE;
1568 }
1569 if (state->n_rdonly != 0) {
1570 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1571 if (ret != 0)
1572 return ret;
1573 if (newstate != state)
1574 return -ESTALE;
1575 }
1576 /*
1577 * We may have performed cached opens for all three recoveries.
1578 * Check if we need to update the current stateid.
1579 */
1580 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1581 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1582 write_seqlock(&state->seqlock);
1583 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1584 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1585 write_sequnlock(&state->seqlock);
1586 }
1587 return 0;
1588}
1589
1590/*
1591 * OPEN_RECLAIM:
1592 * reclaim state on the server after a reboot.
1593 */
1594static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1595{
1596 struct nfs_delegation *delegation;
1597 struct nfs4_opendata *opendata;
1598 fmode_t delegation_type = 0;
1599 int status;
1600
1601 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1602 NFS4_OPEN_CLAIM_PREVIOUS);
1603 if (IS_ERR(opendata))
1604 return PTR_ERR(opendata);
1605 rcu_read_lock();
1606 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1607 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1608 delegation_type = delegation->type;
1609 rcu_read_unlock();
1610 opendata->o_arg.u.delegation_type = delegation_type;
1611 status = nfs4_open_recover(opendata, state);
1612 nfs4_opendata_put(opendata);
1613 return status;
1614}
1615
1616static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1617{
1618 struct nfs_server *server = NFS_SERVER(state->inode);
1619 struct nfs4_exception exception = { };
1620 int err;
1621 do {
1622 err = _nfs4_do_open_reclaim(ctx, state);
1623 trace_nfs4_open_reclaim(ctx, 0, err);
1624 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1625 continue;
1626 if (err != -NFS4ERR_DELAY)
1627 break;
1628 nfs4_handle_exception(server, err, &exception);
1629 } while (exception.retry);
1630 return err;
1631}
1632
1633static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1634{
1635 struct nfs_open_context *ctx;
1636 int ret;
1637
1638 ctx = nfs4_state_find_open_context(state);
1639 if (IS_ERR(ctx))
1640 return -EAGAIN;
1641 ret = nfs4_do_open_reclaim(ctx, state);
1642 put_nfs_open_context(ctx);
1643 return ret;
1644}
1645
1646static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1647{
1648 switch (err) {
1649 default:
1650 printk(KERN_ERR "NFS: %s: unhandled error "
1651 "%d.\n", __func__, err);
1652 case 0:
1653 case -ENOENT:
1654 case -ESTALE:
1655 break;
1656 case -NFS4ERR_BADSESSION:
1657 case -NFS4ERR_BADSLOT:
1658 case -NFS4ERR_BAD_HIGH_SLOT:
1659 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1660 case -NFS4ERR_DEADSESSION:
1661 set_bit(NFS_DELEGATED_STATE, &state->flags);
1662 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1663 return -EAGAIN;
1664 case -NFS4ERR_STALE_CLIENTID:
1665 case -NFS4ERR_STALE_STATEID:
1666 set_bit(NFS_DELEGATED_STATE, &state->flags);
1667 case -NFS4ERR_EXPIRED:
1668 /* Don't recall a delegation if it was lost */
1669 nfs4_schedule_lease_recovery(server->nfs_client);
1670 return -EAGAIN;
1671 case -NFS4ERR_MOVED:
1672 nfs4_schedule_migration_recovery(server);
1673 return -EAGAIN;
1674 case -NFS4ERR_LEASE_MOVED:
1675 nfs4_schedule_lease_moved_recovery(server->nfs_client);
1676 return -EAGAIN;
1677 case -NFS4ERR_DELEG_REVOKED:
1678 case -NFS4ERR_ADMIN_REVOKED:
1679 case -NFS4ERR_BAD_STATEID:
1680 case -NFS4ERR_OPENMODE:
1681 nfs_inode_find_state_and_recover(state->inode,
1682 stateid);
1683 nfs4_schedule_stateid_recovery(server, state);
1684 return -EAGAIN;
1685 case -NFS4ERR_DELAY:
1686 case -NFS4ERR_GRACE:
1687 set_bit(NFS_DELEGATED_STATE, &state->flags);
1688 ssleep(1);
1689 return -EAGAIN;
1690 case -ENOMEM:
1691 case -NFS4ERR_DENIED:
1692 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1693 return 0;
1694 }
1695 return err;
1696}
1697
1698int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1699{
1700 struct nfs_server *server = NFS_SERVER(state->inode);
1701 struct nfs4_opendata *opendata;
1702 int err;
1703
1704 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1705 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1706 if (IS_ERR(opendata))
1707 return PTR_ERR(opendata);
1708 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1709 err = nfs4_open_recover(opendata, state);
1710 nfs4_opendata_put(opendata);
1711 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1712}
1713
1714static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1715{
1716 struct nfs4_opendata *data = calldata;
1717
1718 nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1719 &data->c_arg.seq_args, &data->c_res.seq_res, task);
1720}
1721
1722static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1723{
1724 struct nfs4_opendata *data = calldata;
1725
1726 nfs40_sequence_done(task, &data->c_res.seq_res);
1727
1728 data->rpc_status = task->tk_status;
1729 if (data->rpc_status == 0) {
1730 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1731 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1732 renew_lease(data->o_res.server, data->timestamp);
1733 data->rpc_done = 1;
1734 }
1735}
1736
1737static void nfs4_open_confirm_release(void *calldata)
1738{
1739 struct nfs4_opendata *data = calldata;
1740 struct nfs4_state *state = NULL;
1741
1742 /* If this request hasn't been cancelled, do nothing */
1743 if (data->cancelled == 0)
1744 goto out_free;
1745 /* In case of error, no cleanup! */
1746 if (!data->rpc_done)
1747 goto out_free;
1748 state = nfs4_opendata_to_nfs4_state(data);
1749 if (!IS_ERR(state))
1750 nfs4_close_state(state, data->o_arg.fmode);
1751out_free:
1752 nfs4_opendata_put(data);
1753}
1754
1755static const struct rpc_call_ops nfs4_open_confirm_ops = {
1756 .rpc_call_prepare = nfs4_open_confirm_prepare,
1757 .rpc_call_done = nfs4_open_confirm_done,
1758 .rpc_release = nfs4_open_confirm_release,
1759};
1760
1761/*
1762 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1763 */
1764static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1765{
1766 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1767 struct rpc_task *task;
1768 struct rpc_message msg = {
1769 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1770 .rpc_argp = &data->c_arg,
1771 .rpc_resp = &data->c_res,
1772 .rpc_cred = data->owner->so_cred,
1773 };
1774 struct rpc_task_setup task_setup_data = {
1775 .rpc_client = server->client,
1776 .rpc_message = &msg,
1777 .callback_ops = &nfs4_open_confirm_ops,
1778 .callback_data = data,
1779 .workqueue = nfsiod_workqueue,
1780 .flags = RPC_TASK_ASYNC,
1781 };
1782 int status;
1783
1784 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1785 kref_get(&data->kref);
1786 data->rpc_done = 0;
1787 data->rpc_status = 0;
1788 data->timestamp = jiffies;
1789 task = rpc_run_task(&task_setup_data);
1790 if (IS_ERR(task))
1791 return PTR_ERR(task);
1792 status = nfs4_wait_for_completion_rpc_task(task);
1793 if (status != 0) {
1794 data->cancelled = 1;
1795 smp_wmb();
1796 } else
1797 status = data->rpc_status;
1798 rpc_put_task(task);
1799 return status;
1800}
1801
1802static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1803{
1804 struct nfs4_opendata *data = calldata;
1805 struct nfs4_state_owner *sp = data->owner;
1806 struct nfs_client *clp = sp->so_server->nfs_client;
1807
1808 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1809 goto out_wait;
1810 /*
1811 * Check if we still need to send an OPEN call, or if we can use
1812 * a delegation instead.
1813 */
1814 if (data->state != NULL) {
1815 struct nfs_delegation *delegation;
1816
1817 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1818 goto out_no_action;
1819 rcu_read_lock();
1820 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1821 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1822 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1823 can_open_delegated(delegation, data->o_arg.fmode))
1824 goto unlock_no_action;
1825 rcu_read_unlock();
1826 }
1827 /* Update client id. */
1828 data->o_arg.clientid = clp->cl_clientid;
1829 switch (data->o_arg.claim) {
1830 case NFS4_OPEN_CLAIM_PREVIOUS:
1831 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1832 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1833 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1834 case NFS4_OPEN_CLAIM_FH:
1835 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1836 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1837 }
1838 data->timestamp = jiffies;
1839 if (nfs4_setup_sequence(data->o_arg.server,
1840 &data->o_arg.seq_args,
1841 &data->o_res.seq_res,
1842 task) != 0)
1843 nfs_release_seqid(data->o_arg.seqid);
1844
1845 /* Set the create mode (note dependency on the session type) */
1846 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1847 if (data->o_arg.open_flags & O_EXCL) {
1848 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1849 if (nfs4_has_persistent_session(clp))
1850 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1851 else if (clp->cl_mvops->minor_version > 0)
1852 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1853 }
1854 return;
1855unlock_no_action:
1856 rcu_read_unlock();
1857out_no_action:
1858 task->tk_action = NULL;
1859out_wait:
1860 nfs4_sequence_done(task, &data->o_res.seq_res);
1861}
1862
1863static void nfs4_open_done(struct rpc_task *task, void *calldata)
1864{
1865 struct nfs4_opendata *data = calldata;
1866
1867 data->rpc_status = task->tk_status;
1868
1869 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1870 return;
1871
1872 if (task->tk_status == 0) {
1873 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1874 switch (data->o_res.f_attr->mode & S_IFMT) {
1875 case S_IFREG:
1876 break;
1877 case S_IFLNK:
1878 data->rpc_status = -ELOOP;
1879 break;
1880 case S_IFDIR:
1881 data->rpc_status = -EISDIR;
1882 break;
1883 default:
1884 data->rpc_status = -ENOTDIR;
1885 }
1886 }
1887 renew_lease(data->o_res.server, data->timestamp);
1888 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1889 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1890 }
1891 data->rpc_done = 1;
1892}
1893
1894static void nfs4_open_release(void *calldata)
1895{
1896 struct nfs4_opendata *data = calldata;
1897 struct nfs4_state *state = NULL;
1898
1899 /* If this request hasn't been cancelled, do nothing */
1900 if (data->cancelled == 0)
1901 goto out_free;
1902 /* In case of error, no cleanup! */
1903 if (data->rpc_status != 0 || !data->rpc_done)
1904 goto out_free;
1905 /* In case we need an open_confirm, no cleanup! */
1906 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1907 goto out_free;
1908 state = nfs4_opendata_to_nfs4_state(data);
1909 if (!IS_ERR(state))
1910 nfs4_close_state(state, data->o_arg.fmode);
1911out_free:
1912 nfs4_opendata_put(data);
1913}
1914
1915static const struct rpc_call_ops nfs4_open_ops = {
1916 .rpc_call_prepare = nfs4_open_prepare,
1917 .rpc_call_done = nfs4_open_done,
1918 .rpc_release = nfs4_open_release,
1919};
1920
1921static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1922{
1923 struct inode *dir = data->dir->d_inode;
1924 struct nfs_server *server = NFS_SERVER(dir);
1925 struct nfs_openargs *o_arg = &data->o_arg;
1926 struct nfs_openres *o_res = &data->o_res;
1927 struct rpc_task *task;
1928 struct rpc_message msg = {
1929 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1930 .rpc_argp = o_arg,
1931 .rpc_resp = o_res,
1932 .rpc_cred = data->owner->so_cred,
1933 };
1934 struct rpc_task_setup task_setup_data = {
1935 .rpc_client = server->client,
1936 .rpc_message = &msg,
1937 .callback_ops = &nfs4_open_ops,
1938 .callback_data = data,
1939 .workqueue = nfsiod_workqueue,
1940 .flags = RPC_TASK_ASYNC,
1941 };
1942 int status;
1943
1944 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1945 kref_get(&data->kref);
1946 data->rpc_done = 0;
1947 data->rpc_status = 0;
1948 data->cancelled = 0;
1949 data->is_recover = 0;
1950 if (isrecover) {
1951 nfs4_set_sequence_privileged(&o_arg->seq_args);
1952 data->is_recover = 1;
1953 }
1954 task = rpc_run_task(&task_setup_data);
1955 if (IS_ERR(task))
1956 return PTR_ERR(task);
1957 status = nfs4_wait_for_completion_rpc_task(task);
1958 if (status != 0) {
1959 data->cancelled = 1;
1960 smp_wmb();
1961 } else
1962 status = data->rpc_status;
1963 rpc_put_task(task);
1964
1965 return status;
1966}
1967
1968static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1969{
1970 struct inode *dir = data->dir->d_inode;
1971 struct nfs_openres *o_res = &data->o_res;
1972 int status;
1973
1974 status = nfs4_run_open_task(data, 1);
1975 if (status != 0 || !data->rpc_done)
1976 return status;
1977
1978 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1979
1980 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1981 status = _nfs4_proc_open_confirm(data);
1982 if (status != 0)
1983 return status;
1984 }
1985
1986 return status;
1987}
1988
1989/*
1990 * Additional permission checks in order to distinguish between an
1991 * open for read, and an open for execute. This works around the
1992 * fact that NFSv4 OPEN treats read and execute permissions as being
1993 * the same.
1994 * Note that in the non-execute case, we want to turn off permission
1995 * checking if we just created a new file (POSIX open() semantics).
1996 */
1997static int nfs4_opendata_access(struct rpc_cred *cred,
1998 struct nfs4_opendata *opendata,
1999 struct nfs4_state *state, fmode_t fmode,
2000 int openflags)
2001{
2002 struct nfs_access_entry cache;
2003 u32 mask;
2004
2005 /* access call failed or for some reason the server doesn't
2006 * support any access modes -- defer access call until later */
2007 if (opendata->o_res.access_supported == 0)
2008 return 0;
2009
2010 mask = 0;
2011 /*
2012 * Use openflags to check for exec, because fmode won't
2013 * always have FMODE_EXEC set when file open for exec.
2014 */
2015 if (openflags & __FMODE_EXEC) {
2016 /* ONLY check for exec rights */
2017 mask = MAY_EXEC;
2018 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2019 mask = MAY_READ;
2020
2021 cache.cred = cred;
2022 cache.jiffies = jiffies;
2023 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2024 nfs_access_add_cache(state->inode, &cache);
2025
2026 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2027 return 0;
2028
2029 /* even though OPEN succeeded, access is denied. Close the file */
2030 nfs4_close_state(state, fmode);
2031 return -EACCES;
2032}
2033
2034/*
2035 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2036 */
2037static int _nfs4_proc_open(struct nfs4_opendata *data)
2038{
2039 struct inode *dir = data->dir->d_inode;
2040 struct nfs_server *server = NFS_SERVER(dir);
2041 struct nfs_openargs *o_arg = &data->o_arg;
2042 struct nfs_openres *o_res = &data->o_res;
2043 int status;
2044
2045 status = nfs4_run_open_task(data, 0);
2046 if (!data->rpc_done)
2047 return status;
2048 if (status != 0) {
2049 if (status == -NFS4ERR_BADNAME &&
2050 !(o_arg->open_flags & O_CREAT))
2051 return -ENOENT;
2052 return status;
2053 }
2054
2055 nfs_fattr_map_and_free_names(server, &data->f_attr);
2056
2057 if (o_arg->open_flags & O_CREAT) {
2058 update_changeattr(dir, &o_res->cinfo);
2059 if (o_arg->open_flags & O_EXCL)
2060 data->file_created = 1;
2061 else if (o_res->cinfo.before != o_res->cinfo.after)
2062 data->file_created = 1;
2063 }
2064 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2065 server->caps &= ~NFS_CAP_POSIX_LOCK;
2066 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2067 status = _nfs4_proc_open_confirm(data);
2068 if (status != 0)
2069 return status;
2070 }
2071 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2072 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2073 return 0;
2074}
2075
2076static int nfs4_recover_expired_lease(struct nfs_server *server)
2077{
2078 return nfs4_client_recover_expired_lease(server->nfs_client);
2079}
2080
2081/*
2082 * OPEN_EXPIRED:
2083 * reclaim state on the server after a network partition.
2084 * Assumes caller holds the appropriate lock
2085 */
2086static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2087{
2088 struct nfs4_opendata *opendata;
2089 int ret;
2090
2091 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2092 NFS4_OPEN_CLAIM_FH);
2093 if (IS_ERR(opendata))
2094 return PTR_ERR(opendata);
2095 ret = nfs4_open_recover(opendata, state);
2096 if (ret == -ESTALE)
2097 d_drop(ctx->dentry);
2098 nfs4_opendata_put(opendata);
2099 return ret;
2100}
2101
2102static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2103{
2104 struct nfs_server *server = NFS_SERVER(state->inode);
2105 struct nfs4_exception exception = { };
2106 int err;
2107
2108 do {
2109 err = _nfs4_open_expired(ctx, state);
2110 trace_nfs4_open_expired(ctx, 0, err);
2111 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2112 continue;
2113 switch (err) {
2114 default:
2115 goto out;
2116 case -NFS4ERR_GRACE:
2117 case -NFS4ERR_DELAY:
2118 nfs4_handle_exception(server, err, &exception);
2119 err = 0;
2120 }
2121 } while (exception.retry);
2122out:
2123 return err;
2124}
2125
2126static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2127{
2128 struct nfs_open_context *ctx;
2129 int ret;
2130
2131 ctx = nfs4_state_find_open_context(state);
2132 if (IS_ERR(ctx))
2133 return -EAGAIN;
2134 ret = nfs4_do_open_expired(ctx, state);
2135 put_nfs_open_context(ctx);
2136 return ret;
2137}
2138
2139static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2140{
2141 nfs_remove_bad_delegation(state->inode);
2142 write_seqlock(&state->seqlock);
2143 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2144 write_sequnlock(&state->seqlock);
2145 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2146}
2147
2148static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2149{
2150 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2151 nfs_finish_clear_delegation_stateid(state);
2152}
2153
2154static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2155{
2156 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2157 nfs40_clear_delegation_stateid(state);
2158 return nfs4_open_expired(sp, state);
2159}
2160
2161#if defined(CONFIG_NFS_V4_1)
2162static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2163{
2164 struct nfs_server *server = NFS_SERVER(state->inode);
2165 nfs4_stateid stateid;
2166 struct nfs_delegation *delegation;
2167 struct rpc_cred *cred;
2168 int status;
2169
2170 /* Get the delegation credential for use by test/free_stateid */
2171 rcu_read_lock();
2172 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2173 if (delegation == NULL) {
2174 rcu_read_unlock();
2175 return;
2176 }
2177
2178 nfs4_stateid_copy(&stateid, &delegation->stateid);
2179 cred = get_rpccred(delegation->cred);
2180 rcu_read_unlock();
2181 status = nfs41_test_stateid(server, &stateid, cred);
2182 trace_nfs4_test_delegation_stateid(state, NULL, status);
2183
2184 if (status != NFS_OK) {
2185 /* Free the stateid unless the server explicitly
2186 * informs us the stateid is unrecognized. */
2187 if (status != -NFS4ERR_BAD_STATEID)
2188 nfs41_free_stateid(server, &stateid, cred);
2189 nfs_finish_clear_delegation_stateid(state);
2190 }
2191
2192 put_rpccred(cred);
2193}
2194
2195/**
2196 * nfs41_check_open_stateid - possibly free an open stateid
2197 *
2198 * @state: NFSv4 state for an inode
2199 *
2200 * Returns NFS_OK if recovery for this stateid is now finished.
2201 * Otherwise a negative NFS4ERR value is returned.
2202 */
2203static int nfs41_check_open_stateid(struct nfs4_state *state)
2204{
2205 struct nfs_server *server = NFS_SERVER(state->inode);
2206 nfs4_stateid *stateid = &state->open_stateid;
2207 struct rpc_cred *cred = state->owner->so_cred;
2208 int status;
2209
2210 /* If a state reset has been done, test_stateid is unneeded */
2211 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2212 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2213 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2214 return -NFS4ERR_BAD_STATEID;
2215
2216 status = nfs41_test_stateid(server, stateid, cred);
2217 trace_nfs4_test_open_stateid(state, NULL, status);
2218 if (status != NFS_OK) {
2219 /* Free the stateid unless the server explicitly
2220 * informs us the stateid is unrecognized. */
2221 if (status != -NFS4ERR_BAD_STATEID)
2222 nfs41_free_stateid(server, stateid, cred);
2223
2224 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2225 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2226 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2227 clear_bit(NFS_OPEN_STATE, &state->flags);
2228 }
2229 return status;
2230}
2231
2232static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2233{
2234 int status;
2235
2236 nfs41_check_delegation_stateid(state);
2237 status = nfs41_check_open_stateid(state);
2238 if (status != NFS_OK)
2239 status = nfs4_open_expired(sp, state);
2240 return status;
2241}
2242#endif
2243
2244/*
2245 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2246 * fields corresponding to attributes that were used to store the verifier.
2247 * Make sure we clobber those fields in the later setattr call
2248 */
2249static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2250{
2251 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2252 !(sattr->ia_valid & ATTR_ATIME_SET))
2253 sattr->ia_valid |= ATTR_ATIME;
2254
2255 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2256 !(sattr->ia_valid & ATTR_MTIME_SET))
2257 sattr->ia_valid |= ATTR_MTIME;
2258}
2259
2260static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2261 fmode_t fmode,
2262 int flags,
2263 struct nfs_open_context *ctx)
2264{
2265 struct nfs4_state_owner *sp = opendata->owner;
2266 struct nfs_server *server = sp->so_server;
2267 struct dentry *dentry;
2268 struct nfs4_state *state;
2269 unsigned int seq;
2270 int ret;
2271
2272 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2273
2274 ret = _nfs4_proc_open(opendata);
2275 if (ret != 0)
2276 goto out;
2277
2278 state = nfs4_opendata_to_nfs4_state(opendata);
2279 ret = PTR_ERR(state);
2280 if (IS_ERR(state))
2281 goto out;
2282 if (server->caps & NFS_CAP_POSIX_LOCK)
2283 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2284
2285 dentry = opendata->dentry;
2286 if (dentry->d_inode == NULL) {
2287 /* FIXME: Is this d_drop() ever needed? */
2288 d_drop(dentry);
2289 dentry = d_add_unique(dentry, igrab(state->inode));
2290 if (dentry == NULL) {
2291 dentry = opendata->dentry;
2292 } else if (dentry != ctx->dentry) {
2293 dput(ctx->dentry);
2294 ctx->dentry = dget(dentry);
2295 }
2296 nfs_set_verifier(dentry,
2297 nfs_save_change_attribute(opendata->dir->d_inode));
2298 }
2299
2300 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2301 if (ret != 0)
2302 goto out;
2303
2304 ctx->state = state;
2305 if (dentry->d_inode == state->inode) {
2306 nfs_inode_attach_open_context(ctx);
2307 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2308 nfs4_schedule_stateid_recovery(server, state);
2309 }
2310out:
2311 return ret;
2312}
2313
2314/*
2315 * Returns a referenced nfs4_state
2316 */
2317static int _nfs4_do_open(struct inode *dir,
2318 struct nfs_open_context *ctx,
2319 int flags,
2320 struct iattr *sattr,
2321 struct nfs4_label *label,
2322 int *opened)
2323{
2324 struct nfs4_state_owner *sp;
2325 struct nfs4_state *state = NULL;
2326 struct nfs_server *server = NFS_SERVER(dir);
2327 struct nfs4_opendata *opendata;
2328 struct dentry *dentry = ctx->dentry;
2329 struct rpc_cred *cred = ctx->cred;
2330 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2331 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2332 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2333 struct nfs4_label *olabel = NULL;
2334 int status;
2335
2336 /* Protect against reboot recovery conflicts */
2337 status = -ENOMEM;
2338 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2339 if (sp == NULL) {
2340 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2341 goto out_err;
2342 }
2343 status = nfs4_recover_expired_lease(server);
2344 if (status != 0)
2345 goto err_put_state_owner;
2346 if (dentry->d_inode != NULL)
2347 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2348 status = -ENOMEM;
2349 if (dentry->d_inode)
2350 claim = NFS4_OPEN_CLAIM_FH;
2351 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2352 label, claim, GFP_KERNEL);
2353 if (opendata == NULL)
2354 goto err_put_state_owner;
2355
2356 if (label) {
2357 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2358 if (IS_ERR(olabel)) {
2359 status = PTR_ERR(olabel);
2360 goto err_opendata_put;
2361 }
2362 }
2363
2364 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2365 if (!opendata->f_attr.mdsthreshold) {
2366 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2367 if (!opendata->f_attr.mdsthreshold)
2368 goto err_free_label;
2369 }
2370 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2371 }
2372 if (dentry->d_inode != NULL)
2373 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2374
2375 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2376 if (status != 0)
2377 goto err_free_label;
2378 state = ctx->state;
2379
2380 if ((opendata->o_arg.open_flags & O_EXCL) &&
2381 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2382 nfs4_exclusive_attrset(opendata, sattr);
2383
2384 nfs_fattr_init(opendata->o_res.f_attr);
2385 status = nfs4_do_setattr(state->inode, cred,
2386 opendata->o_res.f_attr, sattr,
2387 state, label, olabel);
2388 if (status == 0) {
2389 nfs_setattr_update_inode(state->inode, sattr);
2390 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2391 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2392 }
2393 }
2394 if (opendata->file_created)
2395 *opened |= FILE_CREATED;
2396
2397 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2398 *ctx_th = opendata->f_attr.mdsthreshold;
2399 opendata->f_attr.mdsthreshold = NULL;
2400 }
2401
2402 nfs4_label_free(olabel);
2403
2404 nfs4_opendata_put(opendata);
2405 nfs4_put_state_owner(sp);
2406 return 0;
2407err_free_label:
2408 nfs4_label_free(olabel);
2409err_opendata_put:
2410 nfs4_opendata_put(opendata);
2411err_put_state_owner:
2412 nfs4_put_state_owner(sp);
2413out_err:
2414 return status;
2415}
2416
2417
2418static struct nfs4_state *nfs4_do_open(struct inode *dir,
2419 struct nfs_open_context *ctx,
2420 int flags,
2421 struct iattr *sattr,
2422 struct nfs4_label *label,
2423 int *opened)
2424{
2425 struct nfs_server *server = NFS_SERVER(dir);
2426 struct nfs4_exception exception = { };
2427 struct nfs4_state *res;
2428 int status;
2429
2430 do {
2431 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2432 res = ctx->state;
2433 trace_nfs4_open_file(ctx, flags, status);
2434 if (status == 0)
2435 break;
2436 /* NOTE: BAD_SEQID means the server and client disagree about the
2437 * book-keeping w.r.t. state-changing operations
2438 * (OPEN/CLOSE/LOCK/LOCKU...)
2439 * It is actually a sign of a bug on the client or on the server.
2440 *
2441 * If we receive a BAD_SEQID error in the particular case of
2442 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2443 * have unhashed the old state_owner for us, and that we can
2444 * therefore safely retry using a new one. We should still warn
2445 * the user though...
2446 */
2447 if (status == -NFS4ERR_BAD_SEQID) {
2448 pr_warn_ratelimited("NFS: v4 server %s "
2449 " returned a bad sequence-id error!\n",
2450 NFS_SERVER(dir)->nfs_client->cl_hostname);
2451 exception.retry = 1;
2452 continue;
2453 }
2454 /*
2455 * BAD_STATEID on OPEN means that the server cancelled our
2456 * state before it received the OPEN_CONFIRM.
2457 * Recover by retrying the request as per the discussion
2458 * on Page 181 of RFC3530.
2459 */
2460 if (status == -NFS4ERR_BAD_STATEID) {
2461 exception.retry = 1;
2462 continue;
2463 }
2464 if (status == -EAGAIN) {
2465 /* We must have found a delegation */
2466 exception.retry = 1;
2467 continue;
2468 }
2469 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2470 continue;
2471 res = ERR_PTR(nfs4_handle_exception(server,
2472 status, &exception));
2473 } while (exception.retry);
2474 return res;
2475}
2476
2477static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2478 struct nfs_fattr *fattr, struct iattr *sattr,
2479 struct nfs4_state *state, struct nfs4_label *ilabel,
2480 struct nfs4_label *olabel)
2481{
2482 struct nfs_server *server = NFS_SERVER(inode);
2483 struct nfs_setattrargs arg = {
2484 .fh = NFS_FH(inode),
2485 .iap = sattr,
2486 .server = server,
2487 .bitmask = server->attr_bitmask,
2488 .label = ilabel,
2489 };
2490 struct nfs_setattrres res = {
2491 .fattr = fattr,
2492 .label = olabel,
2493 .server = server,
2494 };
2495 struct rpc_message msg = {
2496 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2497 .rpc_argp = &arg,
2498 .rpc_resp = &res,
2499 .rpc_cred = cred,
2500 };
2501 unsigned long timestamp = jiffies;
2502 fmode_t fmode;
2503 bool truncate;
2504 int status;
2505
2506 arg.bitmask = nfs4_bitmask(server, ilabel);
2507 if (ilabel)
2508 arg.bitmask = nfs4_bitmask(server, olabel);
2509
2510 nfs_fattr_init(fattr);
2511
2512 /* Servers should only apply open mode checks for file size changes */
2513 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2514 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2515
2516 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2517 /* Use that stateid */
2518 } else if (truncate && state != NULL) {
2519 struct nfs_lockowner lockowner = {
2520 .l_owner = current->files,
2521 .l_pid = current->tgid,
2522 };
2523 if (!nfs4_valid_open_stateid(state))
2524 return -EBADF;
2525 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2526 &lockowner) == -EIO)
2527 return -EBADF;
2528 } else
2529 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2530
2531 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2532 if (status == 0 && state != NULL)
2533 renew_lease(server, timestamp);
2534 return status;
2535}
2536
2537static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2538 struct nfs_fattr *fattr, struct iattr *sattr,
2539 struct nfs4_state *state, struct nfs4_label *ilabel,
2540 struct nfs4_label *olabel)
2541{
2542 struct nfs_server *server = NFS_SERVER(inode);
2543 struct nfs4_exception exception = {
2544 .state = state,
2545 .inode = inode,
2546 };
2547 int err;
2548 do {
2549 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2550 trace_nfs4_setattr(inode, err);
2551 switch (err) {
2552 case -NFS4ERR_OPENMODE:
2553 if (!(sattr->ia_valid & ATTR_SIZE)) {
2554 pr_warn_once("NFSv4: server %s is incorrectly "
2555 "applying open mode checks to "
2556 "a SETATTR that is not "
2557 "changing file size.\n",
2558 server->nfs_client->cl_hostname);
2559 }
2560 if (state && !(state->state & FMODE_WRITE)) {
2561 err = -EBADF;
2562 if (sattr->ia_valid & ATTR_OPEN)
2563 err = -EACCES;
2564 goto out;
2565 }
2566 }
2567 err = nfs4_handle_exception(server, err, &exception);
2568 } while (exception.retry);
2569out:
2570 return err;
2571}
2572
2573struct nfs4_closedata {
2574 struct inode *inode;
2575 struct nfs4_state *state;
2576 struct nfs_closeargs arg;
2577 struct nfs_closeres res;
2578 struct nfs_fattr fattr;
2579 unsigned long timestamp;
2580 bool roc;
2581 u32 roc_barrier;
2582};
2583
2584static void nfs4_free_closedata(void *data)
2585{
2586 struct nfs4_closedata *calldata = data;
2587 struct nfs4_state_owner *sp = calldata->state->owner;
2588 struct super_block *sb = calldata->state->inode->i_sb;
2589
2590 if (calldata->roc)
2591 pnfs_roc_release(calldata->state->inode);
2592 nfs4_put_open_state(calldata->state);
2593 nfs_free_seqid(calldata->arg.seqid);
2594 nfs4_put_state_owner(sp);
2595 nfs_sb_deactive(sb);
2596 kfree(calldata);
2597}
2598
2599static void nfs4_close_done(struct rpc_task *task, void *data)
2600{
2601 struct nfs4_closedata *calldata = data;
2602 struct nfs4_state *state = calldata->state;
2603 struct nfs_server *server = NFS_SERVER(calldata->inode);
2604 nfs4_stateid *res_stateid = NULL;
2605
2606 dprintk("%s: begin!\n", __func__);
2607 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2608 return;
2609 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2610 /* hmm. we are done with the inode, and in the process of freeing
2611 * the state_owner. we keep this around to process errors
2612 */
2613 switch (task->tk_status) {
2614 case 0:
2615 res_stateid = &calldata->res.stateid;
2616 if (calldata->arg.fmode == 0 && calldata->roc)
2617 pnfs_roc_set_barrier(state->inode,
2618 calldata->roc_barrier);
2619 renew_lease(server, calldata->timestamp);
2620 break;
2621 case -NFS4ERR_ADMIN_REVOKED:
2622 case -NFS4ERR_STALE_STATEID:
2623 case -NFS4ERR_OLD_STATEID:
2624 case -NFS4ERR_BAD_STATEID:
2625 case -NFS4ERR_EXPIRED:
2626 if (!nfs4_stateid_match(&calldata->arg.stateid,
2627 &state->stateid)) {
2628 rpc_restart_call_prepare(task);
2629 goto out_release;
2630 }
2631 if (calldata->arg.fmode == 0)
2632 break;
2633 default:
2634 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2635 rpc_restart_call_prepare(task);
2636 goto out_release;
2637 }
2638 }
2639 nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2640out_release:
2641 nfs_release_seqid(calldata->arg.seqid);
2642 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2643 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2644}
2645
2646static void nfs4_close_prepare(struct rpc_task *task, void *data)
2647{
2648 struct nfs4_closedata *calldata = data;
2649 struct nfs4_state *state = calldata->state;
2650 struct inode *inode = calldata->inode;
2651 bool is_rdonly, is_wronly, is_rdwr;
2652 int call_close = 0;
2653
2654 dprintk("%s: begin!\n", __func__);
2655 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2656 goto out_wait;
2657
2658 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2659 spin_lock(&state->owner->so_lock);
2660 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2661 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2662 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2663 nfs4_stateid_copy(&calldata->arg.stateid, &state->stateid);
2664 /* Calculate the change in open mode */
2665 calldata->arg.fmode = 0;
2666 if (state->n_rdwr == 0) {
2667 if (state->n_rdonly == 0)
2668 call_close |= is_rdonly;
2669 else if (is_rdonly)
2670 calldata->arg.fmode |= FMODE_READ;
2671 if (state->n_wronly == 0)
2672 call_close |= is_wronly;
2673 else if (is_wronly)
2674 calldata->arg.fmode |= FMODE_WRITE;
2675 } else if (is_rdwr)
2676 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2677
2678 if (calldata->arg.fmode == 0)
2679 call_close |= is_rdwr;
2680
2681 if (!nfs4_valid_open_stateid(state))
2682 call_close = 0;
2683 spin_unlock(&state->owner->so_lock);
2684
2685 if (!call_close) {
2686 /* Note: exit _without_ calling nfs4_close_done */
2687 goto out_no_action;
2688 }
2689
2690 if (calldata->arg.fmode == 0) {
2691 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2692 if (calldata->roc &&
2693 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2694 nfs_release_seqid(calldata->arg.seqid);
2695 goto out_wait;
2696 }
2697 }
2698
2699 nfs_fattr_init(calldata->res.fattr);
2700 calldata->timestamp = jiffies;
2701 if (nfs4_setup_sequence(NFS_SERVER(inode),
2702 &calldata->arg.seq_args,
2703 &calldata->res.seq_res,
2704 task) != 0)
2705 nfs_release_seqid(calldata->arg.seqid);
2706 dprintk("%s: done!\n", __func__);
2707 return;
2708out_no_action:
2709 task->tk_action = NULL;
2710out_wait:
2711 nfs4_sequence_done(task, &calldata->res.seq_res);
2712}
2713
2714static const struct rpc_call_ops nfs4_close_ops = {
2715 .rpc_call_prepare = nfs4_close_prepare,
2716 .rpc_call_done = nfs4_close_done,
2717 .rpc_release = nfs4_free_closedata,
2718};
2719
2720static bool nfs4_roc(struct inode *inode)
2721{
2722 if (!nfs_have_layout(inode))
2723 return false;
2724 return pnfs_roc(inode);
2725}
2726
2727/*
2728 * It is possible for data to be read/written from a mem-mapped file
2729 * after the sys_close call (which hits the vfs layer as a flush).
2730 * This means that we can't safely call nfsv4 close on a file until
2731 * the inode is cleared. This in turn means that we are not good
2732 * NFSv4 citizens - we do not indicate to the server to update the file's
2733 * share state even when we are done with one of the three share
2734 * stateid's in the inode.
2735 *
2736 * NOTE: Caller must be holding the sp->so_owner semaphore!
2737 */
2738int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2739{
2740 struct nfs_server *server = NFS_SERVER(state->inode);
2741 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2742 struct nfs4_closedata *calldata;
2743 struct nfs4_state_owner *sp = state->owner;
2744 struct rpc_task *task;
2745 struct rpc_message msg = {
2746 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2747 .rpc_cred = state->owner->so_cred,
2748 };
2749 struct rpc_task_setup task_setup_data = {
2750 .rpc_client = server->client,
2751 .rpc_message = &msg,
2752 .callback_ops = &nfs4_close_ops,
2753 .workqueue = nfsiod_workqueue,
2754 .flags = RPC_TASK_ASYNC,
2755 };
2756 int status = -ENOMEM;
2757
2758 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2759 &task_setup_data.rpc_client, &msg);
2760
2761 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2762 if (calldata == NULL)
2763 goto out;
2764 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2765 calldata->inode = state->inode;
2766 calldata->state = state;
2767 calldata->arg.fh = NFS_FH(state->inode);
2768 /* Serialization for the sequence id */
2769 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2770 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2771 if (IS_ERR(calldata->arg.seqid))
2772 goto out_free_calldata;
2773 calldata->arg.fmode = 0;
2774 calldata->arg.bitmask = server->cache_consistency_bitmask;
2775 calldata->res.fattr = &calldata->fattr;
2776 calldata->res.seqid = calldata->arg.seqid;
2777 calldata->res.server = server;
2778 calldata->roc = nfs4_roc(state->inode);
2779 nfs_sb_active(calldata->inode->i_sb);
2780
2781 msg.rpc_argp = &calldata->arg;
2782 msg.rpc_resp = &calldata->res;
2783 task_setup_data.callback_data = calldata;
2784 task = rpc_run_task(&task_setup_data);
2785 if (IS_ERR(task))
2786 return PTR_ERR(task);
2787 status = 0;
2788 if (wait)
2789 status = rpc_wait_for_completion_task(task);
2790 rpc_put_task(task);
2791 return status;
2792out_free_calldata:
2793 kfree(calldata);
2794out:
2795 nfs4_put_open_state(state);
2796 nfs4_put_state_owner(sp);
2797 return status;
2798}
2799
2800static struct inode *
2801nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2802 int open_flags, struct iattr *attr, int *opened)
2803{
2804 struct nfs4_state *state;
2805 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2806
2807 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2808
2809 /* Protect against concurrent sillydeletes */
2810 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2811
2812 nfs4_label_release_security(label);
2813
2814 if (IS_ERR(state))
2815 return ERR_CAST(state);
2816 return state->inode;
2817}
2818
2819static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2820{
2821 if (ctx->state == NULL)
2822 return;
2823 if (is_sync)
2824 nfs4_close_sync(ctx->state, ctx->mode);
2825 else
2826 nfs4_close_state(ctx->state, ctx->mode);
2827}
2828
2829#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2830#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2831#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2832
2833static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2834{
2835 struct nfs4_server_caps_arg args = {
2836 .fhandle = fhandle,
2837 };
2838 struct nfs4_server_caps_res res = {};
2839 struct rpc_message msg = {
2840 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2841 .rpc_argp = &args,
2842 .rpc_resp = &res,
2843 };
2844 int status;
2845
2846 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2847 if (status == 0) {
2848 /* Sanity check the server answers */
2849 switch (server->nfs_client->cl_minorversion) {
2850 case 0:
2851 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2852 res.attr_bitmask[2] = 0;
2853 break;
2854 case 1:
2855 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2856 break;
2857 case 2:
2858 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2859 }
2860 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2861 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2862 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2863 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2864 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2865 NFS_CAP_CTIME|NFS_CAP_MTIME|
2866 NFS_CAP_SECURITY_LABEL);
2867 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2868 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2869 server->caps |= NFS_CAP_ACLS;
2870 if (res.has_links != 0)
2871 server->caps |= NFS_CAP_HARDLINKS;
2872 if (res.has_symlinks != 0)
2873 server->caps |= NFS_CAP_SYMLINKS;
2874 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2875 server->caps |= NFS_CAP_FILEID;
2876 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2877 server->caps |= NFS_CAP_MODE;
2878 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2879 server->caps |= NFS_CAP_NLINK;
2880 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2881 server->caps |= NFS_CAP_OWNER;
2882 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2883 server->caps |= NFS_CAP_OWNER_GROUP;
2884 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2885 server->caps |= NFS_CAP_ATIME;
2886 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2887 server->caps |= NFS_CAP_CTIME;
2888 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2889 server->caps |= NFS_CAP_MTIME;
2890#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2891 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2892 server->caps |= NFS_CAP_SECURITY_LABEL;
2893#endif
2894 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2895 sizeof(server->attr_bitmask));
2896 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2897
2898 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2899 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2900 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2901 server->cache_consistency_bitmask[2] = 0;
2902 server->acl_bitmask = res.acl_bitmask;
2903 server->fh_expire_type = res.fh_expire_type;
2904 }
2905
2906 return status;
2907}
2908
2909int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2910{
2911 struct nfs4_exception exception = { };
2912 int err;
2913 do {
2914 err = nfs4_handle_exception(server,
2915 _nfs4_server_capabilities(server, fhandle),
2916 &exception);
2917 } while (exception.retry);
2918 return err;
2919}
2920
2921static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2922 struct nfs_fsinfo *info)
2923{
2924 u32 bitmask[3];
2925 struct nfs4_lookup_root_arg args = {
2926 .bitmask = bitmask,
2927 };
2928 struct nfs4_lookup_res res = {
2929 .server = server,
2930 .fattr = info->fattr,
2931 .fh = fhandle,
2932 };
2933 struct rpc_message msg = {
2934 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2935 .rpc_argp = &args,
2936 .rpc_resp = &res,
2937 };
2938
2939 bitmask[0] = nfs4_fattr_bitmap[0];
2940 bitmask[1] = nfs4_fattr_bitmap[1];
2941 /*
2942 * Process the label in the upcoming getfattr
2943 */
2944 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2945
2946 nfs_fattr_init(info->fattr);
2947 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2948}
2949
2950static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2951 struct nfs_fsinfo *info)
2952{
2953 struct nfs4_exception exception = { };
2954 int err;
2955 do {
2956 err = _nfs4_lookup_root(server, fhandle, info);
2957 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2958 switch (err) {
2959 case 0:
2960 case -NFS4ERR_WRONGSEC:
2961 goto out;
2962 default:
2963 err = nfs4_handle_exception(server, err, &exception);
2964 }
2965 } while (exception.retry);
2966out:
2967 return err;
2968}
2969
2970static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2971 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2972{
2973 struct rpc_auth_create_args auth_args = {
2974 .pseudoflavor = flavor,
2975 };
2976 struct rpc_auth *auth;
2977 int ret;
2978
2979 auth = rpcauth_create(&auth_args, server->client);
2980 if (IS_ERR(auth)) {
2981 ret = -EACCES;
2982 goto out;
2983 }
2984 ret = nfs4_lookup_root(server, fhandle, info);
2985out:
2986 return ret;
2987}
2988
2989/*
2990 * Retry pseudoroot lookup with various security flavors. We do this when:
2991 *
2992 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2993 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2994 *
2995 * Returns zero on success, or a negative NFS4ERR value, or a
2996 * negative errno value.
2997 */
2998static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2999 struct nfs_fsinfo *info)
3000{
3001 /* Per 3530bis 15.33.5 */
3002 static const rpc_authflavor_t flav_array[] = {
3003 RPC_AUTH_GSS_KRB5P,
3004 RPC_AUTH_GSS_KRB5I,
3005 RPC_AUTH_GSS_KRB5,
3006 RPC_AUTH_UNIX, /* courtesy */
3007 RPC_AUTH_NULL,
3008 };
3009 int status = -EPERM;
3010 size_t i;
3011
3012 if (server->auth_info.flavor_len > 0) {
3013 /* try each flavor specified by user */
3014 for (i = 0; i < server->auth_info.flavor_len; i++) {
3015 status = nfs4_lookup_root_sec(server, fhandle, info,
3016 server->auth_info.flavors[i]);
3017 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3018 continue;
3019 break;
3020 }
3021 } else {
3022 /* no flavors specified by user, try default list */
3023 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3024 status = nfs4_lookup_root_sec(server, fhandle, info,
3025 flav_array[i]);
3026 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3027 continue;
3028 break;
3029 }
3030 }
3031
3032 /*
3033 * -EACCESS could mean that the user doesn't have correct permissions
3034 * to access the mount. It could also mean that we tried to mount
3035 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
3036 * existing mount programs don't handle -EACCES very well so it should
3037 * be mapped to -EPERM instead.
3038 */
3039 if (status == -EACCES)
3040 status = -EPERM;
3041 return status;
3042}
3043
3044static int nfs4_do_find_root_sec(struct nfs_server *server,
3045 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3046{
3047 int mv = server->nfs_client->cl_minorversion;
3048 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3049}
3050
3051/**
3052 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3053 * @server: initialized nfs_server handle
3054 * @fhandle: we fill in the pseudo-fs root file handle
3055 * @info: we fill in an FSINFO struct
3056 * @auth_probe: probe the auth flavours
3057 *
3058 * Returns zero on success, or a negative errno.
3059 */
3060int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3061 struct nfs_fsinfo *info,
3062 bool auth_probe)
3063{
3064 int status;
3065
3066 switch (auth_probe) {
3067 case false:
3068 status = nfs4_lookup_root(server, fhandle, info);
3069 if (status != -NFS4ERR_WRONGSEC)
3070 break;
3071 default:
3072 status = nfs4_do_find_root_sec(server, fhandle, info);
3073 }
3074
3075 if (status == 0)
3076 status = nfs4_server_capabilities(server, fhandle);
3077 if (status == 0)
3078 status = nfs4_do_fsinfo(server, fhandle, info);
3079
3080 return nfs4_map_errors(status);
3081}
3082
3083static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3084 struct nfs_fsinfo *info)
3085{
3086 int error;
3087 struct nfs_fattr *fattr = info->fattr;
3088 struct nfs4_label *label = NULL;
3089
3090 error = nfs4_server_capabilities(server, mntfh);
3091 if (error < 0) {
3092 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3093 return error;
3094 }
3095
3096 label = nfs4_label_alloc(server, GFP_KERNEL);
3097 if (IS_ERR(label))
3098 return PTR_ERR(label);
3099
3100 error = nfs4_proc_getattr(server, mntfh, fattr, label);
3101 if (error < 0) {
3102 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3103 goto err_free_label;
3104 }
3105
3106 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3107 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3108 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3109
3110err_free_label:
3111 nfs4_label_free(label);
3112
3113 return error;
3114}
3115
3116/*
3117 * Get locations and (maybe) other attributes of a referral.
3118 * Note that we'll actually follow the referral later when
3119 * we detect fsid mismatch in inode revalidation
3120 */
3121static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3122 const struct qstr *name, struct nfs_fattr *fattr,
3123 struct nfs_fh *fhandle)
3124{
3125 int status = -ENOMEM;
3126 struct page *page = NULL;
3127 struct nfs4_fs_locations *locations = NULL;
3128
3129 page = alloc_page(GFP_KERNEL);
3130 if (page == NULL)
3131 goto out;
3132 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3133 if (locations == NULL)
3134 goto out;
3135
3136 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3137 if (status != 0)
3138 goto out;
3139
3140 /*
3141 * If the fsid didn't change, this is a migration event, not a
3142 * referral. Cause us to drop into the exception handler, which
3143 * will kick off migration recovery.
3144 */
3145 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3146 dprintk("%s: server did not return a different fsid for"
3147 " a referral at %s\n", __func__, name->name);
3148 status = -NFS4ERR_MOVED;
3149 goto out;
3150 }
3151 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3152 nfs_fixup_referral_attributes(&locations->fattr);
3153
3154 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3155 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3156 memset(fhandle, 0, sizeof(struct nfs_fh));
3157out:
3158 if (page)
3159 __free_page(page);
3160 kfree(locations);
3161 return status;
3162}
3163
3164static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3165 struct nfs_fattr *fattr, struct nfs4_label *label)
3166{
3167 struct nfs4_getattr_arg args = {
3168 .fh = fhandle,
3169 .bitmask = server->attr_bitmask,
3170 };
3171 struct nfs4_getattr_res res = {
3172 .fattr = fattr,
3173 .label = label,
3174 .server = server,
3175 };
3176 struct rpc_message msg = {
3177 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3178 .rpc_argp = &args,
3179 .rpc_resp = &res,
3180 };
3181
3182 args.bitmask = nfs4_bitmask(server, label);
3183
3184 nfs_fattr_init(fattr);
3185 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3186}
3187
3188static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3189 struct nfs_fattr *fattr, struct nfs4_label *label)
3190{
3191 struct nfs4_exception exception = { };
3192 int err;
3193 do {
3194 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3195 trace_nfs4_getattr(server, fhandle, fattr, err);
3196 err = nfs4_handle_exception(server, err,
3197 &exception);
3198 } while (exception.retry);
3199 return err;
3200}
3201
3202/*
3203 * The file is not closed if it is opened due to the a request to change
3204 * the size of the file. The open call will not be needed once the
3205 * VFS layer lookup-intents are implemented.
3206 *
3207 * Close is called when the inode is destroyed.
3208 * If we haven't opened the file for O_WRONLY, we
3209 * need to in the size_change case to obtain a stateid.
3210 *
3211 * Got race?
3212 * Because OPEN is always done by name in nfsv4, it is
3213 * possible that we opened a different file by the same
3214 * name. We can recognize this race condition, but we
3215 * can't do anything about it besides returning an error.
3216 *
3217 * This will be fixed with VFS changes (lookup-intent).
3218 */
3219static int
3220nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3221 struct iattr *sattr)
3222{
3223 struct inode *inode = dentry->d_inode;
3224 struct rpc_cred *cred = NULL;
3225 struct nfs4_state *state = NULL;
3226 struct nfs4_label *label = NULL;
3227 int status;
3228
3229 if (pnfs_ld_layoutret_on_setattr(inode) &&
3230 sattr->ia_valid & ATTR_SIZE &&
3231 sattr->ia_size < i_size_read(inode))
3232 pnfs_commit_and_return_layout(inode);
3233
3234 nfs_fattr_init(fattr);
3235
3236 /* Deal with open(O_TRUNC) */
3237 if (sattr->ia_valid & ATTR_OPEN)
3238 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3239
3240 /* Optimization: if the end result is no change, don't RPC */
3241 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3242 return 0;
3243
3244 /* Search for an existing open(O_WRITE) file */
3245 if (sattr->ia_valid & ATTR_FILE) {
3246 struct nfs_open_context *ctx;
3247
3248 ctx = nfs_file_open_context(sattr->ia_file);
3249 if (ctx) {
3250 cred = ctx->cred;
3251 state = ctx->state;
3252 }
3253 }
3254
3255 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3256 if (IS_ERR(label))
3257 return PTR_ERR(label);
3258
3259 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3260 if (status == 0) {
3261 nfs_setattr_update_inode(inode, sattr);
3262 nfs_setsecurity(inode, fattr, label);
3263 }
3264 nfs4_label_free(label);
3265 return status;
3266}
3267
3268static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3269 const struct qstr *name, struct nfs_fh *fhandle,
3270 struct nfs_fattr *fattr, struct nfs4_label *label)
3271{
3272 struct nfs_server *server = NFS_SERVER(dir);
3273 int status;
3274 struct nfs4_lookup_arg args = {
3275 .bitmask = server->attr_bitmask,
3276 .dir_fh = NFS_FH(dir),
3277 .name = name,
3278 };
3279 struct nfs4_lookup_res res = {
3280 .server = server,
3281 .fattr = fattr,
3282 .label = label,
3283 .fh = fhandle,
3284 };
3285 struct rpc_message msg = {
3286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3287 .rpc_argp = &args,
3288 .rpc_resp = &res,
3289 };
3290
3291 args.bitmask = nfs4_bitmask(server, label);
3292
3293 nfs_fattr_init(fattr);
3294
3295 dprintk("NFS call lookup %s\n", name->name);
3296 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3297 dprintk("NFS reply lookup: %d\n", status);
3298 return status;
3299}
3300
3301static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3302{
3303 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3304 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3305 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3306 fattr->nlink = 2;
3307}
3308
3309static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3310 struct qstr *name, struct nfs_fh *fhandle,
3311 struct nfs_fattr *fattr, struct nfs4_label *label)
3312{
3313 struct nfs4_exception exception = { };
3314 struct rpc_clnt *client = *clnt;
3315 int err;
3316 do {
3317 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3318 trace_nfs4_lookup(dir, name, err);
3319 switch (err) {
3320 case -NFS4ERR_BADNAME:
3321 err = -ENOENT;
3322 goto out;
3323 case -NFS4ERR_MOVED:
3324 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3325 goto out;
3326 case -NFS4ERR_WRONGSEC:
3327 err = -EPERM;
3328 if (client != *clnt)
3329 goto out;
3330 client = nfs4_negotiate_security(client, dir, name);
3331 if (IS_ERR(client))
3332 return PTR_ERR(client);
3333
3334 exception.retry = 1;
3335 break;
3336 default:
3337 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3338 }
3339 } while (exception.retry);
3340
3341out:
3342 if (err == 0)
3343 *clnt = client;
3344 else if (client != *clnt)
3345 rpc_shutdown_client(client);
3346
3347 return err;
3348}
3349
3350static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3351 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3352 struct nfs4_label *label)
3353{
3354 int status;
3355 struct rpc_clnt *client = NFS_CLIENT(dir);
3356
3357 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3358 if (client != NFS_CLIENT(dir)) {
3359 rpc_shutdown_client(client);
3360 nfs_fixup_secinfo_attributes(fattr);
3361 }
3362 return status;
3363}
3364
3365struct rpc_clnt *
3366nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3367 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3368{
3369 struct rpc_clnt *client = NFS_CLIENT(dir);
3370 int status;
3371
3372 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3373 if (status < 0)
3374 return ERR_PTR(status);
3375 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3376}
3377
3378static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3379{
3380 struct nfs_server *server = NFS_SERVER(inode);
3381 struct nfs4_accessargs args = {
3382 .fh = NFS_FH(inode),
3383 .bitmask = server->cache_consistency_bitmask,
3384 };
3385 struct nfs4_accessres res = {
3386 .server = server,
3387 };
3388 struct rpc_message msg = {
3389 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3390 .rpc_argp = &args,
3391 .rpc_resp = &res,
3392 .rpc_cred = entry->cred,
3393 };
3394 int mode = entry->mask;
3395 int status = 0;
3396
3397 /*
3398 * Determine which access bits we want to ask for...
3399 */
3400 if (mode & MAY_READ)
3401 args.access |= NFS4_ACCESS_READ;
3402 if (S_ISDIR(inode->i_mode)) {
3403 if (mode & MAY_WRITE)
3404 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3405 if (mode & MAY_EXEC)
3406 args.access |= NFS4_ACCESS_LOOKUP;
3407 } else {
3408 if (mode & MAY_WRITE)
3409 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3410 if (mode & MAY_EXEC)
3411 args.access |= NFS4_ACCESS_EXECUTE;
3412 }
3413
3414 res.fattr = nfs_alloc_fattr();
3415 if (res.fattr == NULL)
3416 return -ENOMEM;
3417
3418 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3419 if (!status) {
3420 nfs_access_set_mask(entry, res.access);
3421 nfs_refresh_inode(inode, res.fattr);
3422 }
3423 nfs_free_fattr(res.fattr);
3424 return status;
3425}
3426
3427static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3428{
3429 struct nfs4_exception exception = { };
3430 int err;
3431 do {
3432 err = _nfs4_proc_access(inode, entry);
3433 trace_nfs4_access(inode, err);
3434 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3435 &exception);
3436 } while (exception.retry);
3437 return err;
3438}
3439
3440/*
3441 * TODO: For the time being, we don't try to get any attributes
3442 * along with any of the zero-copy operations READ, READDIR,
3443 * READLINK, WRITE.
3444 *
3445 * In the case of the first three, we want to put the GETATTR
3446 * after the read-type operation -- this is because it is hard
3447 * to predict the length of a GETATTR response in v4, and thus
3448 * align the READ data correctly. This means that the GETATTR
3449 * may end up partially falling into the page cache, and we should
3450 * shift it into the 'tail' of the xdr_buf before processing.
3451 * To do this efficiently, we need to know the total length
3452 * of data received, which doesn't seem to be available outside
3453 * of the RPC layer.
3454 *
3455 * In the case of WRITE, we also want to put the GETATTR after
3456 * the operation -- in this case because we want to make sure
3457 * we get the post-operation mtime and size.
3458 *
3459 * Both of these changes to the XDR layer would in fact be quite
3460 * minor, but I decided to leave them for a subsequent patch.
3461 */
3462static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3463 unsigned int pgbase, unsigned int pglen)
3464{
3465 struct nfs4_readlink args = {
3466 .fh = NFS_FH(inode),
3467 .pgbase = pgbase,
3468 .pglen = pglen,
3469 .pages = &page,
3470 };
3471 struct nfs4_readlink_res res;
3472 struct rpc_message msg = {
3473 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3474 .rpc_argp = &args,
3475 .rpc_resp = &res,
3476 };
3477
3478 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3479}
3480
3481static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3482 unsigned int pgbase, unsigned int pglen)
3483{
3484 struct nfs4_exception exception = { };
3485 int err;
3486 do {
3487 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3488 trace_nfs4_readlink(inode, err);
3489 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3490 &exception);
3491 } while (exception.retry);
3492 return err;
3493}
3494
3495/*
3496 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3497 */
3498static int
3499nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3500 int flags)
3501{
3502 struct nfs4_label l, *ilabel = NULL;
3503 struct nfs_open_context *ctx;
3504 struct nfs4_state *state;
3505 int opened = 0;
3506 int status = 0;
3507
3508 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3509 if (IS_ERR(ctx))
3510 return PTR_ERR(ctx);
3511
3512 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3513
3514 sattr->ia_mode &= ~current_umask();
3515 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3516 if (IS_ERR(state)) {
3517 status = PTR_ERR(state);
3518 goto out;
3519 }
3520out:
3521 nfs4_label_release_security(ilabel);
3522 put_nfs_open_context(ctx);
3523 return status;
3524}
3525
3526static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3527{
3528 struct nfs_server *server = NFS_SERVER(dir);
3529 struct nfs_removeargs args = {
3530 .fh = NFS_FH(dir),
3531 .name = *name,
3532 };
3533 struct nfs_removeres res = {
3534 .server = server,
3535 };
3536 struct rpc_message msg = {
3537 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3538 .rpc_argp = &args,
3539 .rpc_resp = &res,
3540 };
3541 int status;
3542
3543 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3544 if (status == 0)
3545 update_changeattr(dir, &res.cinfo);
3546 return status;
3547}
3548
3549static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3550{
3551 struct nfs4_exception exception = { };
3552 int err;
3553 do {
3554 err = _nfs4_proc_remove(dir, name);
3555 trace_nfs4_remove(dir, name, err);
3556 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3557 &exception);
3558 } while (exception.retry);
3559 return err;
3560}
3561
3562static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3563{
3564 struct nfs_server *server = NFS_SERVER(dir);
3565 struct nfs_removeargs *args = msg->rpc_argp;
3566 struct nfs_removeres *res = msg->rpc_resp;
3567
3568 res->server = server;
3569 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3570 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3571
3572 nfs_fattr_init(res->dir_attr);
3573}
3574
3575static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3576{
3577 nfs4_setup_sequence(NFS_SERVER(data->dir),
3578 &data->args.seq_args,
3579 &data->res.seq_res,
3580 task);
3581}
3582
3583static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3584{
3585 struct nfs_unlinkdata *data = task->tk_calldata;
3586 struct nfs_removeres *res = &data->res;
3587
3588 if (!nfs4_sequence_done(task, &res->seq_res))
3589 return 0;
3590 if (nfs4_async_handle_error(task, res->server, NULL,
3591 &data->timeout) == -EAGAIN)
3592 return 0;
3593 update_changeattr(dir, &res->cinfo);
3594 return 1;
3595}
3596
3597static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3598{
3599 struct nfs_server *server = NFS_SERVER(dir);
3600 struct nfs_renameargs *arg = msg->rpc_argp;
3601 struct nfs_renameres *res = msg->rpc_resp;
3602
3603 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3604 res->server = server;
3605 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3606}
3607
3608static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3609{
3610 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3611 &data->args.seq_args,
3612 &data->res.seq_res,
3613 task);
3614}
3615
3616static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3617 struct inode *new_dir)
3618{
3619 struct nfs_renamedata *data = task->tk_calldata;
3620 struct nfs_renameres *res = &data->res;
3621
3622 if (!nfs4_sequence_done(task, &res->seq_res))
3623 return 0;
3624 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3625 return 0;
3626
3627 update_changeattr(old_dir, &res->old_cinfo);
3628 update_changeattr(new_dir, &res->new_cinfo);
3629 return 1;
3630}
3631
3632static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3633{
3634 struct nfs_server *server = NFS_SERVER(inode);
3635 struct nfs4_link_arg arg = {
3636 .fh = NFS_FH(inode),
3637 .dir_fh = NFS_FH(dir),
3638 .name = name,
3639 .bitmask = server->attr_bitmask,
3640 };
3641 struct nfs4_link_res res = {
3642 .server = server,
3643 .label = NULL,
3644 };
3645 struct rpc_message msg = {
3646 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3647 .rpc_argp = &arg,
3648 .rpc_resp = &res,
3649 };
3650 int status = -ENOMEM;
3651
3652 res.fattr = nfs_alloc_fattr();
3653 if (res.fattr == NULL)
3654 goto out;
3655
3656 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3657 if (IS_ERR(res.label)) {
3658 status = PTR_ERR(res.label);
3659 goto out;
3660 }
3661 arg.bitmask = nfs4_bitmask(server, res.label);
3662
3663 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3664 if (!status) {
3665 update_changeattr(dir, &res.cinfo);
3666 status = nfs_post_op_update_inode(inode, res.fattr);
3667 if (!status)
3668 nfs_setsecurity(inode, res.fattr, res.label);
3669 }
3670
3671
3672 nfs4_label_free(res.label);
3673
3674out:
3675 nfs_free_fattr(res.fattr);
3676 return status;
3677}
3678
3679static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3680{
3681 struct nfs4_exception exception = { };
3682 int err;
3683 do {
3684 err = nfs4_handle_exception(NFS_SERVER(inode),
3685 _nfs4_proc_link(inode, dir, name),
3686 &exception);
3687 } while (exception.retry);
3688 return err;
3689}
3690
3691struct nfs4_createdata {
3692 struct rpc_message msg;
3693 struct nfs4_create_arg arg;
3694 struct nfs4_create_res res;
3695 struct nfs_fh fh;
3696 struct nfs_fattr fattr;
3697 struct nfs4_label *label;
3698};
3699
3700static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3701 struct qstr *name, struct iattr *sattr, u32 ftype)
3702{
3703 struct nfs4_createdata *data;
3704
3705 data = kzalloc(sizeof(*data), GFP_KERNEL);
3706 if (data != NULL) {
3707 struct nfs_server *server = NFS_SERVER(dir);
3708
3709 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3710 if (IS_ERR(data->label))
3711 goto out_free;
3712
3713 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3714 data->msg.rpc_argp = &data->arg;
3715 data->msg.rpc_resp = &data->res;
3716 data->arg.dir_fh = NFS_FH(dir);
3717 data->arg.server = server;
3718 data->arg.name = name;
3719 data->arg.attrs = sattr;
3720 data->arg.ftype = ftype;
3721 data->arg.bitmask = nfs4_bitmask(server, data->label);
3722 data->res.server = server;
3723 data->res.fh = &data->fh;
3724 data->res.fattr = &data->fattr;
3725 data->res.label = data->label;
3726 nfs_fattr_init(data->res.fattr);
3727 }
3728 return data;
3729out_free:
3730 kfree(data);
3731 return NULL;
3732}
3733
3734static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3735{
3736 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3737 &data->arg.seq_args, &data->res.seq_res, 1);
3738 if (status == 0) {
3739 update_changeattr(dir, &data->res.dir_cinfo);
3740 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3741 }
3742 return status;
3743}
3744
3745static void nfs4_free_createdata(struct nfs4_createdata *data)
3746{
3747 nfs4_label_free(data->label);
3748 kfree(data);
3749}
3750
3751static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3752 struct page *page, unsigned int len, struct iattr *sattr,
3753 struct nfs4_label *label)
3754{
3755 struct nfs4_createdata *data;
3756 int status = -ENAMETOOLONG;
3757
3758 if (len > NFS4_MAXPATHLEN)
3759 goto out;
3760
3761 status = -ENOMEM;
3762 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3763 if (data == NULL)
3764 goto out;
3765
3766 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3767 data->arg.u.symlink.pages = &page;
3768 data->arg.u.symlink.len = len;
3769 data->arg.label = label;
3770
3771 status = nfs4_do_create(dir, dentry, data);
3772
3773 nfs4_free_createdata(data);
3774out:
3775 return status;
3776}
3777
3778static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3779 struct page *page, unsigned int len, struct iattr *sattr)
3780{
3781 struct nfs4_exception exception = { };
3782 struct nfs4_label l, *label = NULL;
3783 int err;
3784
3785 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3786
3787 do {
3788 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3789 trace_nfs4_symlink(dir, &dentry->d_name, err);
3790 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3791 &exception);
3792 } while (exception.retry);
3793
3794 nfs4_label_release_security(label);
3795 return err;
3796}
3797
3798static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3799 struct iattr *sattr, struct nfs4_label *label)
3800{
3801 struct nfs4_createdata *data;
3802 int status = -ENOMEM;
3803
3804 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3805 if (data == NULL)
3806 goto out;
3807
3808 data->arg.label = label;
3809 status = nfs4_do_create(dir, dentry, data);
3810
3811 nfs4_free_createdata(data);
3812out:
3813 return status;
3814}
3815
3816static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3817 struct iattr *sattr)
3818{
3819 struct nfs4_exception exception = { };
3820 struct nfs4_label l, *label = NULL;
3821 int err;
3822
3823 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3824
3825 sattr->ia_mode &= ~current_umask();
3826 do {
3827 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3828 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3829 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3830 &exception);
3831 } while (exception.retry);
3832 nfs4_label_release_security(label);
3833
3834 return err;
3835}
3836
3837static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3838 u64 cookie, struct page **pages, unsigned int count, int plus)
3839{
3840 struct inode *dir = dentry->d_inode;
3841 struct nfs4_readdir_arg args = {
3842 .fh = NFS_FH(dir),
3843 .pages = pages,
3844 .pgbase = 0,
3845 .count = count,
3846 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3847 .plus = plus,
3848 };
3849 struct nfs4_readdir_res res;
3850 struct rpc_message msg = {
3851 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3852 .rpc_argp = &args,
3853 .rpc_resp = &res,
3854 .rpc_cred = cred,
3855 };
3856 int status;
3857
3858 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3859 dentry,
3860 (unsigned long long)cookie);
3861 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3862 res.pgbase = args.pgbase;
3863 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3864 if (status >= 0) {
3865 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3866 status += args.pgbase;
3867 }
3868
3869 nfs_invalidate_atime(dir);
3870
3871 dprintk("%s: returns %d\n", __func__, status);
3872 return status;
3873}
3874
3875static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3876 u64 cookie, struct page **pages, unsigned int count, int plus)
3877{
3878 struct nfs4_exception exception = { };
3879 int err;
3880 do {
3881 err = _nfs4_proc_readdir(dentry, cred, cookie,
3882 pages, count, plus);
3883 trace_nfs4_readdir(dentry->d_inode, err);
3884 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3885 &exception);
3886 } while (exception.retry);
3887 return err;
3888}
3889
3890static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3891 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3892{
3893 struct nfs4_createdata *data;
3894 int mode = sattr->ia_mode;
3895 int status = -ENOMEM;
3896
3897 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3898 if (data == NULL)
3899 goto out;
3900
3901 if (S_ISFIFO(mode))
3902 data->arg.ftype = NF4FIFO;
3903 else if (S_ISBLK(mode)) {
3904 data->arg.ftype = NF4BLK;
3905 data->arg.u.device.specdata1 = MAJOR(rdev);
3906 data->arg.u.device.specdata2 = MINOR(rdev);
3907 }
3908 else if (S_ISCHR(mode)) {
3909 data->arg.ftype = NF4CHR;
3910 data->arg.u.device.specdata1 = MAJOR(rdev);
3911 data->arg.u.device.specdata2 = MINOR(rdev);
3912 } else if (!S_ISSOCK(mode)) {
3913 status = -EINVAL;
3914 goto out_free;
3915 }
3916
3917 data->arg.label = label;
3918 status = nfs4_do_create(dir, dentry, data);
3919out_free:
3920 nfs4_free_createdata(data);
3921out:
3922 return status;
3923}
3924
3925static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3926 struct iattr *sattr, dev_t rdev)
3927{
3928 struct nfs4_exception exception = { };
3929 struct nfs4_label l, *label = NULL;
3930 int err;
3931
3932 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3933
3934 sattr->ia_mode &= ~current_umask();
3935 do {
3936 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3937 trace_nfs4_mknod(dir, &dentry->d_name, err);
3938 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3939 &exception);
3940 } while (exception.retry);
3941
3942 nfs4_label_release_security(label);
3943
3944 return err;
3945}
3946
3947static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3948 struct nfs_fsstat *fsstat)
3949{
3950 struct nfs4_statfs_arg args = {
3951 .fh = fhandle,
3952 .bitmask = server->attr_bitmask,
3953 };
3954 struct nfs4_statfs_res res = {
3955 .fsstat = fsstat,
3956 };
3957 struct rpc_message msg = {
3958 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3959 .rpc_argp = &args,
3960 .rpc_resp = &res,
3961 };
3962
3963 nfs_fattr_init(fsstat->fattr);
3964 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3965}
3966
3967static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3968{
3969 struct nfs4_exception exception = { };
3970 int err;
3971 do {
3972 err = nfs4_handle_exception(server,
3973 _nfs4_proc_statfs(server, fhandle, fsstat),
3974 &exception);
3975 } while (exception.retry);
3976 return err;
3977}
3978
3979static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3980 struct nfs_fsinfo *fsinfo)
3981{
3982 struct nfs4_fsinfo_arg args = {
3983 .fh = fhandle,
3984 .bitmask = server->attr_bitmask,
3985 };
3986 struct nfs4_fsinfo_res res = {
3987 .fsinfo = fsinfo,
3988 };
3989 struct rpc_message msg = {
3990 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3991 .rpc_argp = &args,
3992 .rpc_resp = &res,
3993 };
3994
3995 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3996}
3997
3998static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3999{
4000 struct nfs4_exception exception = { };
4001 unsigned long now = jiffies;
4002 int err;
4003
4004 do {
4005 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4006 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4007 if (err == 0) {
4008 struct nfs_client *clp = server->nfs_client;
4009
4010 spin_lock(&clp->cl_lock);
4011 clp->cl_lease_time = fsinfo->lease_time * HZ;
4012 clp->cl_last_renewal = now;
4013 spin_unlock(&clp->cl_lock);
4014 break;
4015 }
4016 err = nfs4_handle_exception(server, err, &exception);
4017 } while (exception.retry);
4018 return err;
4019}
4020
4021static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4022{
4023 int error;
4024
4025 nfs_fattr_init(fsinfo->fattr);
4026 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4027 if (error == 0) {
4028 /* block layout checks this! */
4029 server->pnfs_blksize = fsinfo->blksize;
4030 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4031 }
4032
4033 return error;
4034}
4035
4036static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4037 struct nfs_pathconf *pathconf)
4038{
4039 struct nfs4_pathconf_arg args = {
4040 .fh = fhandle,
4041 .bitmask = server->attr_bitmask,
4042 };
4043 struct nfs4_pathconf_res res = {
4044 .pathconf = pathconf,
4045 };
4046 struct rpc_message msg = {
4047 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4048 .rpc_argp = &args,
4049 .rpc_resp = &res,
4050 };
4051
4052 /* None of the pathconf attributes are mandatory to implement */
4053 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4054 memset(pathconf, 0, sizeof(*pathconf));
4055 return 0;
4056 }
4057
4058 nfs_fattr_init(pathconf->fattr);
4059 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4060}
4061
4062static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4063 struct nfs_pathconf *pathconf)
4064{
4065 struct nfs4_exception exception = { };
4066 int err;
4067
4068 do {
4069 err = nfs4_handle_exception(server,
4070 _nfs4_proc_pathconf(server, fhandle, pathconf),
4071 &exception);
4072 } while (exception.retry);
4073 return err;
4074}
4075
4076int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4077 const struct nfs_open_context *ctx,
4078 const struct nfs_lock_context *l_ctx,
4079 fmode_t fmode)
4080{
4081 const struct nfs_lockowner *lockowner = NULL;
4082
4083 if (l_ctx != NULL)
4084 lockowner = &l_ctx->lockowner;
4085 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4086}
4087EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4088
4089static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4090 const struct nfs_open_context *ctx,
4091 const struct nfs_lock_context *l_ctx,
4092 fmode_t fmode)
4093{
4094 nfs4_stateid current_stateid;
4095
4096 /* If the current stateid represents a lost lock, then exit */
4097 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4098 return true;
4099 return nfs4_stateid_match(stateid, &current_stateid);
4100}
4101
4102static bool nfs4_error_stateid_expired(int err)
4103{
4104 switch (err) {
4105 case -NFS4ERR_DELEG_REVOKED:
4106 case -NFS4ERR_ADMIN_REVOKED:
4107 case -NFS4ERR_BAD_STATEID:
4108 case -NFS4ERR_STALE_STATEID:
4109 case -NFS4ERR_OLD_STATEID:
4110 case -NFS4ERR_OPENMODE:
4111 case -NFS4ERR_EXPIRED:
4112 return true;
4113 }
4114 return false;
4115}
4116
4117void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4118{
4119 nfs_invalidate_atime(hdr->inode);
4120}
4121
4122static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4123{
4124 struct nfs_server *server = NFS_SERVER(hdr->inode);
4125
4126 trace_nfs4_read(hdr, task->tk_status);
4127 if (nfs4_async_handle_error(task, server,
4128 hdr->args.context->state,
4129 NULL) == -EAGAIN) {
4130 rpc_restart_call_prepare(task);
4131 return -EAGAIN;
4132 }
4133
4134 __nfs4_read_done_cb(hdr);
4135 if (task->tk_status > 0)
4136 renew_lease(server, hdr->timestamp);
4137 return 0;
4138}
4139
4140static bool nfs4_read_stateid_changed(struct rpc_task *task,
4141 struct nfs_pgio_args *args)
4142{
4143
4144 if (!nfs4_error_stateid_expired(task->tk_status) ||
4145 nfs4_stateid_is_current(&args->stateid,
4146 args->context,
4147 args->lock_context,
4148 FMODE_READ))
4149 return false;
4150 rpc_restart_call_prepare(task);
4151 return true;
4152}
4153
4154static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4155{
4156
4157 dprintk("--> %s\n", __func__);
4158
4159 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4160 return -EAGAIN;
4161 if (nfs4_read_stateid_changed(task, &hdr->args))
4162 return -EAGAIN;
4163 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4164 nfs4_read_done_cb(task, hdr);
4165}
4166
4167static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4168 struct rpc_message *msg)
4169{
4170 hdr->timestamp = jiffies;
4171 hdr->pgio_done_cb = nfs4_read_done_cb;
4172 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4173 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4174}
4175
4176static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4177 struct nfs_pgio_header *hdr)
4178{
4179 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4180 &hdr->args.seq_args,
4181 &hdr->res.seq_res,
4182 task))
4183 return 0;
4184 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4185 hdr->args.lock_context,
4186 hdr->rw_ops->rw_mode) == -EIO)
4187 return -EIO;
4188 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4189 return -EIO;
4190 return 0;
4191}
4192
4193static int nfs4_write_done_cb(struct rpc_task *task,
4194 struct nfs_pgio_header *hdr)
4195{
4196 struct inode *inode = hdr->inode;
4197
4198 trace_nfs4_write(hdr, task->tk_status);
4199 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4200 hdr->args.context->state,
4201 NULL) == -EAGAIN) {
4202 rpc_restart_call_prepare(task);
4203 return -EAGAIN;
4204 }
4205 if (task->tk_status >= 0) {
4206 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4207 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4208 }
4209 return 0;
4210}
4211
4212static bool nfs4_write_stateid_changed(struct rpc_task *task,
4213 struct nfs_pgio_args *args)
4214{
4215
4216 if (!nfs4_error_stateid_expired(task->tk_status) ||
4217 nfs4_stateid_is_current(&args->stateid,
4218 args->context,
4219 args->lock_context,
4220 FMODE_WRITE))
4221 return false;
4222 rpc_restart_call_prepare(task);
4223 return true;
4224}
4225
4226static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4227{
4228 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4229 return -EAGAIN;
4230 if (nfs4_write_stateid_changed(task, &hdr->args))
4231 return -EAGAIN;
4232 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4233 nfs4_write_done_cb(task, hdr);
4234}
4235
4236static
4237bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4238{
4239 /* Don't request attributes for pNFS or O_DIRECT writes */
4240 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4241 return false;
4242 /* Otherwise, request attributes if and only if we don't hold
4243 * a delegation
4244 */
4245 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4246}
4247
4248static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4249 struct rpc_message *msg)
4250{
4251 struct nfs_server *server = NFS_SERVER(hdr->inode);
4252
4253 if (!nfs4_write_need_cache_consistency_data(hdr)) {
4254 hdr->args.bitmask = NULL;
4255 hdr->res.fattr = NULL;
4256 } else
4257 hdr->args.bitmask = server->cache_consistency_bitmask;
4258
4259 if (!hdr->pgio_done_cb)
4260 hdr->pgio_done_cb = nfs4_write_done_cb;
4261 hdr->res.server = server;
4262 hdr->timestamp = jiffies;
4263
4264 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4265 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4266}
4267
4268static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4269{
4270 nfs4_setup_sequence(NFS_SERVER(data->inode),
4271 &data->args.seq_args,
4272 &data->res.seq_res,
4273 task);
4274}
4275
4276static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4277{
4278 struct inode *inode = data->inode;
4279
4280 trace_nfs4_commit(data, task->tk_status);
4281 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4282 NULL, NULL) == -EAGAIN) {
4283 rpc_restart_call_prepare(task);
4284 return -EAGAIN;
4285 }
4286 return 0;
4287}
4288
4289static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4290{
4291 if (!nfs4_sequence_done(task, &data->res.seq_res))
4292 return -EAGAIN;
4293 return data->commit_done_cb(task, data);
4294}
4295
4296static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4297{
4298 struct nfs_server *server = NFS_SERVER(data->inode);
4299
4300 if (data->commit_done_cb == NULL)
4301 data->commit_done_cb = nfs4_commit_done_cb;
4302 data->res.server = server;
4303 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4304 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4305}
4306
4307struct nfs4_renewdata {
4308 struct nfs_client *client;
4309 unsigned long timestamp;
4310};
4311
4312/*
4313 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4314 * standalone procedure for queueing an asynchronous RENEW.
4315 */
4316static void nfs4_renew_release(void *calldata)
4317{
4318 struct nfs4_renewdata *data = calldata;
4319 struct nfs_client *clp = data->client;
4320
4321 if (atomic_read(&clp->cl_count) > 1)
4322 nfs4_schedule_state_renewal(clp);
4323 nfs_put_client(clp);
4324 kfree(data);
4325}
4326
4327static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4328{
4329 struct nfs4_renewdata *data = calldata;
4330 struct nfs_client *clp = data->client;
4331 unsigned long timestamp = data->timestamp;
4332
4333 trace_nfs4_renew_async(clp, task->tk_status);
4334 switch (task->tk_status) {
4335 case 0:
4336 break;
4337 case -NFS4ERR_LEASE_MOVED:
4338 nfs4_schedule_lease_moved_recovery(clp);
4339 break;
4340 default:
4341 /* Unless we're shutting down, schedule state recovery! */
4342 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4343 return;
4344 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4345 nfs4_schedule_lease_recovery(clp);
4346 return;
4347 }
4348 nfs4_schedule_path_down_recovery(clp);
4349 }
4350 do_renew_lease(clp, timestamp);
4351}
4352
4353static const struct rpc_call_ops nfs4_renew_ops = {
4354 .rpc_call_done = nfs4_renew_done,
4355 .rpc_release = nfs4_renew_release,
4356};
4357
4358static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4359{
4360 struct rpc_message msg = {
4361 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4362 .rpc_argp = clp,
4363 .rpc_cred = cred,
4364 };
4365 struct nfs4_renewdata *data;
4366
4367 if (renew_flags == 0)
4368 return 0;
4369 if (!atomic_inc_not_zero(&clp->cl_count))
4370 return -EIO;
4371 data = kmalloc(sizeof(*data), GFP_NOFS);
4372 if (data == NULL)
4373 return -ENOMEM;
4374 data->client = clp;
4375 data->timestamp = jiffies;
4376 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4377 &nfs4_renew_ops, data);
4378}
4379
4380static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4381{
4382 struct rpc_message msg = {
4383 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4384 .rpc_argp = clp,
4385 .rpc_cred = cred,
4386 };
4387 unsigned long now = jiffies;
4388 int status;
4389
4390 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4391 if (status < 0)
4392 return status;
4393 do_renew_lease(clp, now);
4394 return 0;
4395}
4396
4397static inline int nfs4_server_supports_acls(struct nfs_server *server)
4398{
4399 return server->caps & NFS_CAP_ACLS;
4400}
4401
4402/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4403 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4404 * the stack.
4405 */
4406#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4407
4408static int buf_to_pages_noslab(const void *buf, size_t buflen,
4409 struct page **pages, unsigned int *pgbase)
4410{
4411 struct page *newpage, **spages;
4412 int rc = 0;
4413 size_t len;
4414 spages = pages;
4415
4416 do {
4417 len = min_t(size_t, PAGE_SIZE, buflen);
4418 newpage = alloc_page(GFP_KERNEL);
4419
4420 if (newpage == NULL)
4421 goto unwind;
4422 memcpy(page_address(newpage), buf, len);
4423 buf += len;
4424 buflen -= len;
4425 *pages++ = newpage;
4426 rc++;
4427 } while (buflen != 0);
4428
4429 return rc;
4430
4431unwind:
4432 for(; rc > 0; rc--)
4433 __free_page(spages[rc-1]);
4434 return -ENOMEM;
4435}
4436
4437struct nfs4_cached_acl {
4438 int cached;
4439 size_t len;
4440 char data[0];
4441};
4442
4443static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4444{
4445 struct nfs_inode *nfsi = NFS_I(inode);
4446
4447 spin_lock(&inode->i_lock);
4448 kfree(nfsi->nfs4_acl);
4449 nfsi->nfs4_acl = acl;
4450 spin_unlock(&inode->i_lock);
4451}
4452
4453static void nfs4_zap_acl_attr(struct inode *inode)
4454{
4455 nfs4_set_cached_acl(inode, NULL);
4456}
4457
4458static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4459{
4460 struct nfs_inode *nfsi = NFS_I(inode);
4461 struct nfs4_cached_acl *acl;
4462 int ret = -ENOENT;
4463
4464 spin_lock(&inode->i_lock);
4465 acl = nfsi->nfs4_acl;
4466 if (acl == NULL)
4467 goto out;
4468 if (buf == NULL) /* user is just asking for length */
4469 goto out_len;
4470 if (acl->cached == 0)
4471 goto out;
4472 ret = -ERANGE; /* see getxattr(2) man page */
4473 if (acl->len > buflen)
4474 goto out;
4475 memcpy(buf, acl->data, acl->len);
4476out_len:
4477 ret = acl->len;
4478out:
4479 spin_unlock(&inode->i_lock);
4480 return ret;
4481}
4482
4483static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4484{
4485 struct nfs4_cached_acl *acl;
4486 size_t buflen = sizeof(*acl) + acl_len;
4487
4488 if (buflen <= PAGE_SIZE) {
4489 acl = kmalloc(buflen, GFP_KERNEL);
4490 if (acl == NULL)
4491 goto out;
4492 acl->cached = 1;
4493 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4494 } else {
4495 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4496 if (acl == NULL)
4497 goto out;
4498 acl->cached = 0;
4499 }
4500 acl->len = acl_len;
4501out:
4502 nfs4_set_cached_acl(inode, acl);
4503}
4504
4505/*
4506 * The getxattr API returns the required buffer length when called with a
4507 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4508 * the required buf. On a NULL buf, we send a page of data to the server
4509 * guessing that the ACL request can be serviced by a page. If so, we cache
4510 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4511 * the cache. If not so, we throw away the page, and cache the required
4512 * length. The next getxattr call will then produce another round trip to
4513 * the server, this time with the input buf of the required size.
4514 */
4515static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4516{
4517 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4518 struct nfs_getaclargs args = {
4519 .fh = NFS_FH(inode),
4520 .acl_pages = pages,
4521 .acl_len = buflen,
4522 };
4523 struct nfs_getaclres res = {
4524 .acl_len = buflen,
4525 };
4526 struct rpc_message msg = {
4527 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4528 .rpc_argp = &args,
4529 .rpc_resp = &res,
4530 };
4531 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4532 int ret = -ENOMEM, i;
4533
4534 /* As long as we're doing a round trip to the server anyway,
4535 * let's be prepared for a page of acl data. */
4536 if (npages == 0)
4537 npages = 1;
4538 if (npages > ARRAY_SIZE(pages))
4539 return -ERANGE;
4540
4541 for (i = 0; i < npages; i++) {
4542 pages[i] = alloc_page(GFP_KERNEL);
4543 if (!pages[i])
4544 goto out_free;
4545 }
4546
4547 /* for decoding across pages */
4548 res.acl_scratch = alloc_page(GFP_KERNEL);
4549 if (!res.acl_scratch)
4550 goto out_free;
4551
4552 args.acl_len = npages * PAGE_SIZE;
4553 args.acl_pgbase = 0;
4554
4555 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4556 __func__, buf, buflen, npages, args.acl_len);
4557 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4558 &msg, &args.seq_args, &res.seq_res, 0);
4559 if (ret)
4560 goto out_free;
4561
4562 /* Handle the case where the passed-in buffer is too short */
4563 if (res.acl_flags & NFS4_ACL_TRUNC) {
4564 /* Did the user only issue a request for the acl length? */
4565 if (buf == NULL)
4566 goto out_ok;
4567 ret = -ERANGE;
4568 goto out_free;
4569 }
4570 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4571 if (buf) {
4572 if (res.acl_len > buflen) {
4573 ret = -ERANGE;
4574 goto out_free;
4575 }
4576 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4577 }
4578out_ok:
4579 ret = res.acl_len;
4580out_free:
4581 for (i = 0; i < npages; i++)
4582 if (pages[i])
4583 __free_page(pages[i]);
4584 if (res.acl_scratch)
4585 __free_page(res.acl_scratch);
4586 return ret;
4587}
4588
4589static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4590{
4591 struct nfs4_exception exception = { };
4592 ssize_t ret;
4593 do {
4594 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4595 trace_nfs4_get_acl(inode, ret);
4596 if (ret >= 0)
4597 break;
4598 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4599 } while (exception.retry);
4600 return ret;
4601}
4602
4603static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4604{
4605 struct nfs_server *server = NFS_SERVER(inode);
4606 int ret;
4607
4608 if (!nfs4_server_supports_acls(server))
4609 return -EOPNOTSUPP;
4610 ret = nfs_revalidate_inode(server, inode);
4611 if (ret < 0)
4612 return ret;
4613 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4614 nfs_zap_acl_cache(inode);
4615 ret = nfs4_read_cached_acl(inode, buf, buflen);
4616 if (ret != -ENOENT)
4617 /* -ENOENT is returned if there is no ACL or if there is an ACL
4618 * but no cached acl data, just the acl length */
4619 return ret;
4620 return nfs4_get_acl_uncached(inode, buf, buflen);
4621}
4622
4623static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4624{
4625 struct nfs_server *server = NFS_SERVER(inode);
4626 struct page *pages[NFS4ACL_MAXPAGES];
4627 struct nfs_setaclargs arg = {
4628 .fh = NFS_FH(inode),
4629 .acl_pages = pages,
4630 .acl_len = buflen,
4631 };
4632 struct nfs_setaclres res;
4633 struct rpc_message msg = {
4634 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4635 .rpc_argp = &arg,
4636 .rpc_resp = &res,
4637 };
4638 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4639 int ret, i;
4640
4641 if (!nfs4_server_supports_acls(server))
4642 return -EOPNOTSUPP;
4643 if (npages > ARRAY_SIZE(pages))
4644 return -ERANGE;
4645 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4646 if (i < 0)
4647 return i;
4648 nfs4_inode_return_delegation(inode);
4649 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4650
4651 /*
4652 * Free each page after tx, so the only ref left is
4653 * held by the network stack
4654 */
4655 for (; i > 0; i--)
4656 put_page(pages[i-1]);
4657
4658 /*
4659 * Acl update can result in inode attribute update.
4660 * so mark the attribute cache invalid.
4661 */
4662 spin_lock(&inode->i_lock);
4663 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4664 spin_unlock(&inode->i_lock);
4665 nfs_access_zap_cache(inode);
4666 nfs_zap_acl_cache(inode);
4667 return ret;
4668}
4669
4670static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4671{
4672 struct nfs4_exception exception = { };
4673 int err;
4674 do {
4675 err = __nfs4_proc_set_acl(inode, buf, buflen);
4676 trace_nfs4_set_acl(inode, err);
4677 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4678 &exception);
4679 } while (exception.retry);
4680 return err;
4681}
4682
4683#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4684static int _nfs4_get_security_label(struct inode *inode, void *buf,
4685 size_t buflen)
4686{
4687 struct nfs_server *server = NFS_SERVER(inode);
4688 struct nfs_fattr fattr;
4689 struct nfs4_label label = {0, 0, buflen, buf};
4690
4691 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4692 struct nfs4_getattr_arg arg = {
4693 .fh = NFS_FH(inode),
4694 .bitmask = bitmask,
4695 };
4696 struct nfs4_getattr_res res = {
4697 .fattr = &fattr,
4698 .label = &label,
4699 .server = server,
4700 };
4701 struct rpc_message msg = {
4702 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4703 .rpc_argp = &arg,
4704 .rpc_resp = &res,
4705 };
4706 int ret;
4707
4708 nfs_fattr_init(&fattr);
4709
4710 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4711 if (ret)
4712 return ret;
4713 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4714 return -ENOENT;
4715 if (buflen < label.len)
4716 return -ERANGE;
4717 return 0;
4718}
4719
4720static int nfs4_get_security_label(struct inode *inode, void *buf,
4721 size_t buflen)
4722{
4723 struct nfs4_exception exception = { };
4724 int err;
4725
4726 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4727 return -EOPNOTSUPP;
4728
4729 do {
4730 err = _nfs4_get_security_label(inode, buf, buflen);
4731 trace_nfs4_get_security_label(inode, err);
4732 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4733 &exception);
4734 } while (exception.retry);
4735 return err;
4736}
4737
4738static int _nfs4_do_set_security_label(struct inode *inode,
4739 struct nfs4_label *ilabel,
4740 struct nfs_fattr *fattr,
4741 struct nfs4_label *olabel)
4742{
4743
4744 struct iattr sattr = {0};
4745 struct nfs_server *server = NFS_SERVER(inode);
4746 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4747 struct nfs_setattrargs arg = {
4748 .fh = NFS_FH(inode),
4749 .iap = &sattr,
4750 .server = server,
4751 .bitmask = bitmask,
4752 .label = ilabel,
4753 };
4754 struct nfs_setattrres res = {
4755 .fattr = fattr,
4756 .label = olabel,
4757 .server = server,
4758 };
4759 struct rpc_message msg = {
4760 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4761 .rpc_argp = &arg,
4762 .rpc_resp = &res,
4763 };
4764 int status;
4765
4766 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4767
4768 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4769 if (status)
4770 dprintk("%s failed: %d\n", __func__, status);
4771
4772 return status;
4773}
4774
4775static int nfs4_do_set_security_label(struct inode *inode,
4776 struct nfs4_label *ilabel,
4777 struct nfs_fattr *fattr,
4778 struct nfs4_label *olabel)
4779{
4780 struct nfs4_exception exception = { };
4781 int err;
4782
4783 do {
4784 err = _nfs4_do_set_security_label(inode, ilabel,
4785 fattr, olabel);
4786 trace_nfs4_set_security_label(inode, err);
4787 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4788 &exception);
4789 } while (exception.retry);
4790 return err;
4791}
4792
4793static int
4794nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4795{
4796 struct nfs4_label ilabel, *olabel = NULL;
4797 struct nfs_fattr fattr;
4798 struct rpc_cred *cred;
4799 struct inode *inode = dentry->d_inode;
4800 int status;
4801
4802 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4803 return -EOPNOTSUPP;
4804
4805 nfs_fattr_init(&fattr);
4806
4807 ilabel.pi = 0;
4808 ilabel.lfs = 0;
4809 ilabel.label = (char *)buf;
4810 ilabel.len = buflen;
4811
4812 cred = rpc_lookup_cred();
4813 if (IS_ERR(cred))
4814 return PTR_ERR(cred);
4815
4816 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4817 if (IS_ERR(olabel)) {
4818 status = -PTR_ERR(olabel);
4819 goto out;
4820 }
4821
4822 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4823 if (status == 0)
4824 nfs_setsecurity(inode, &fattr, olabel);
4825
4826 nfs4_label_free(olabel);
4827out:
4828 put_rpccred(cred);
4829 return status;
4830}
4831#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4832
4833
4834static int
4835nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4836 struct nfs4_state *state, long *timeout)
4837{
4838 struct nfs_client *clp = server->nfs_client;
4839
4840 if (task->tk_status >= 0)
4841 return 0;
4842 switch(task->tk_status) {
4843 case -NFS4ERR_DELEG_REVOKED:
4844 case -NFS4ERR_ADMIN_REVOKED:
4845 case -NFS4ERR_BAD_STATEID:
4846 case -NFS4ERR_OPENMODE:
4847 if (state == NULL)
4848 break;
4849 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4850 goto recovery_failed;
4851 goto wait_on_recovery;
4852 case -NFS4ERR_EXPIRED:
4853 if (state != NULL) {
4854 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4855 goto recovery_failed;
4856 }
4857 case -NFS4ERR_STALE_STATEID:
4858 case -NFS4ERR_STALE_CLIENTID:
4859 nfs4_schedule_lease_recovery(clp);
4860 goto wait_on_recovery;
4861 case -NFS4ERR_MOVED:
4862 if (nfs4_schedule_migration_recovery(server) < 0)
4863 goto recovery_failed;
4864 goto wait_on_recovery;
4865 case -NFS4ERR_LEASE_MOVED:
4866 nfs4_schedule_lease_moved_recovery(clp);
4867 goto wait_on_recovery;
4868#if defined(CONFIG_NFS_V4_1)
4869 case -NFS4ERR_BADSESSION:
4870 case -NFS4ERR_BADSLOT:
4871 case -NFS4ERR_BAD_HIGH_SLOT:
4872 case -NFS4ERR_DEADSESSION:
4873 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4874 case -NFS4ERR_SEQ_FALSE_RETRY:
4875 case -NFS4ERR_SEQ_MISORDERED:
4876 dprintk("%s ERROR %d, Reset session\n", __func__,
4877 task->tk_status);
4878 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4879 goto wait_on_recovery;
4880#endif /* CONFIG_NFS_V4_1 */
4881 case -NFS4ERR_DELAY:
4882 nfs_inc_server_stats(server, NFSIOS_DELAY);
4883 rpc_delay(task, nfs4_update_delay(timeout));
4884 goto restart_call;
4885 case -NFS4ERR_GRACE:
4886 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4887 case -NFS4ERR_RETRY_UNCACHED_REP:
4888 case -NFS4ERR_OLD_STATEID:
4889 goto restart_call;
4890 }
4891 task->tk_status = nfs4_map_errors(task->tk_status);
4892 return 0;
4893recovery_failed:
4894 task->tk_status = -EIO;
4895 return 0;
4896wait_on_recovery:
4897 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4898 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4899 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4900 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4901 goto recovery_failed;
4902restart_call:
4903 task->tk_status = 0;
4904 return -EAGAIN;
4905}
4906
4907static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4908 nfs4_verifier *bootverf)
4909{
4910 __be32 verf[2];
4911
4912 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4913 /* An impossible timestamp guarantees this value
4914 * will never match a generated boot time. */
4915 verf[0] = 0;
4916 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4917 } else {
4918 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4919 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4920 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4921 }
4922 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4923}
4924
4925static unsigned int
4926nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4927 char *buf, size_t len)
4928{
4929 unsigned int result;
4930
4931 if (clp->cl_owner_id != NULL)
4932 return strlcpy(buf, clp->cl_owner_id, len);
4933
4934 rcu_read_lock();
4935 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4936 clp->cl_ipaddr,
4937 rpc_peeraddr2str(clp->cl_rpcclient,
4938 RPC_DISPLAY_ADDR),
4939 rpc_peeraddr2str(clp->cl_rpcclient,
4940 RPC_DISPLAY_PROTO));
4941 rcu_read_unlock();
4942 clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4943 return result;
4944}
4945
4946static unsigned int
4947nfs4_init_uniform_client_string(struct nfs_client *clp,
4948 char *buf, size_t len)
4949{
4950 const char *nodename = clp->cl_rpcclient->cl_nodename;
4951 unsigned int result;
4952
4953 if (clp->cl_owner_id != NULL)
4954 return strlcpy(buf, clp->cl_owner_id, len);
4955
4956 if (nfs4_client_id_uniquifier[0] != '\0')
4957 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4958 clp->rpc_ops->version,
4959 clp->cl_minorversion,
4960 nfs4_client_id_uniquifier,
4961 nodename);
4962 else
4963 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4964 clp->rpc_ops->version, clp->cl_minorversion,
4965 nodename);
4966 clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4967 return result;
4968}
4969
4970/*
4971 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4972 * services. Advertise one based on the address family of the
4973 * clientaddr.
4974 */
4975static unsigned int
4976nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4977{
4978 if (strchr(clp->cl_ipaddr, ':') != NULL)
4979 return scnprintf(buf, len, "tcp6");
4980 else
4981 return scnprintf(buf, len, "tcp");
4982}
4983
4984static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4985{
4986 struct nfs4_setclientid *sc = calldata;
4987
4988 if (task->tk_status == 0)
4989 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4990}
4991
4992static const struct rpc_call_ops nfs4_setclientid_ops = {
4993 .rpc_call_done = nfs4_setclientid_done,
4994};
4995
4996/**
4997 * nfs4_proc_setclientid - Negotiate client ID
4998 * @clp: state data structure
4999 * @program: RPC program for NFSv4 callback service
5000 * @port: IP port number for NFS4 callback service
5001 * @cred: RPC credential to use for this call
5002 * @res: where to place the result
5003 *
5004 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5005 */
5006int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5007 unsigned short port, struct rpc_cred *cred,
5008 struct nfs4_setclientid_res *res)
5009{
5010 nfs4_verifier sc_verifier;
5011 struct nfs4_setclientid setclientid = {
5012 .sc_verifier = &sc_verifier,
5013 .sc_prog = program,
5014 .sc_cb_ident = clp->cl_cb_ident,
5015 };
5016 struct rpc_message msg = {
5017 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5018 .rpc_argp = &setclientid,
5019 .rpc_resp = res,
5020 .rpc_cred = cred,
5021 };
5022 struct rpc_task *task;
5023 struct rpc_task_setup task_setup_data = {
5024 .rpc_client = clp->cl_rpcclient,
5025 .rpc_message = &msg,
5026 .callback_ops = &nfs4_setclientid_ops,
5027 .callback_data = &setclientid,
5028 .flags = RPC_TASK_TIMEOUT,
5029 };
5030 int status;
5031
5032 /* nfs_client_id4 */
5033 nfs4_init_boot_verifier(clp, &sc_verifier);
5034 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5035 setclientid.sc_name_len =
5036 nfs4_init_uniform_client_string(clp,
5037 setclientid.sc_name,
5038 sizeof(setclientid.sc_name));
5039 else
5040 setclientid.sc_name_len =
5041 nfs4_init_nonuniform_client_string(clp,
5042 setclientid.sc_name,
5043 sizeof(setclientid.sc_name));
5044 /* cb_client4 */
5045 setclientid.sc_netid_len =
5046 nfs4_init_callback_netid(clp,
5047 setclientid.sc_netid,
5048 sizeof(setclientid.sc_netid));
5049 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5050 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5051 clp->cl_ipaddr, port >> 8, port & 255);
5052
5053 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
5054 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5055 setclientid.sc_name_len, setclientid.sc_name);
5056 task = rpc_run_task(&task_setup_data);
5057 if (IS_ERR(task)) {
5058 status = PTR_ERR(task);
5059 goto out;
5060 }
5061 status = task->tk_status;
5062 if (setclientid.sc_cred) {
5063 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5064 put_rpccred(setclientid.sc_cred);
5065 }
5066 rpc_put_task(task);
5067out:
5068 trace_nfs4_setclientid(clp, status);
5069 dprintk("NFS reply setclientid: %d\n", status);
5070 return status;
5071}
5072
5073/**
5074 * nfs4_proc_setclientid_confirm - Confirm client ID
5075 * @clp: state data structure
5076 * @res: result of a previous SETCLIENTID
5077 * @cred: RPC credential to use for this call
5078 *
5079 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5080 */
5081int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5082 struct nfs4_setclientid_res *arg,
5083 struct rpc_cred *cred)
5084{
5085 struct rpc_message msg = {
5086 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5087 .rpc_argp = arg,
5088 .rpc_cred = cred,
5089 };
5090 int status;
5091
5092 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
5093 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5094 clp->cl_clientid);
5095 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5096 trace_nfs4_setclientid_confirm(clp, status);
5097 dprintk("NFS reply setclientid_confirm: %d\n", status);
5098 return status;
5099}
5100
5101struct nfs4_delegreturndata {
5102 struct nfs4_delegreturnargs args;
5103 struct nfs4_delegreturnres res;
5104 struct nfs_fh fh;
5105 nfs4_stateid stateid;
5106 unsigned long timestamp;
5107 struct nfs_fattr fattr;
5108 int rpc_status;
5109 struct inode *inode;
5110 bool roc;
5111 u32 roc_barrier;
5112};
5113
5114static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5115{
5116 struct nfs4_delegreturndata *data = calldata;
5117
5118 if (!nfs4_sequence_done(task, &data->res.seq_res))
5119 return;
5120
5121 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5122 switch (task->tk_status) {
5123 case 0:
5124 renew_lease(data->res.server, data->timestamp);
5125 case -NFS4ERR_ADMIN_REVOKED:
5126 case -NFS4ERR_DELEG_REVOKED:
5127 case -NFS4ERR_BAD_STATEID:
5128 case -NFS4ERR_OLD_STATEID:
5129 case -NFS4ERR_STALE_STATEID:
5130 case -NFS4ERR_EXPIRED:
5131 task->tk_status = 0;
5132 if (data->roc)
5133 pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5134 break;
5135 default:
5136 if (nfs4_async_handle_error(task, data->res.server,
5137 NULL, NULL) == -EAGAIN) {
5138 rpc_restart_call_prepare(task);
5139 return;
5140 }
5141 }
5142 data->rpc_status = task->tk_status;
5143}
5144
5145static void nfs4_delegreturn_release(void *calldata)
5146{
5147 struct nfs4_delegreturndata *data = calldata;
5148
5149 if (data->roc)
5150 pnfs_roc_release(data->inode);
5151 kfree(calldata);
5152}
5153
5154static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5155{
5156 struct nfs4_delegreturndata *d_data;
5157
5158 d_data = (struct nfs4_delegreturndata *)data;
5159
5160 if (d_data->roc &&
5161 pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5162 return;
5163
5164 nfs4_setup_sequence(d_data->res.server,
5165 &d_data->args.seq_args,
5166 &d_data->res.seq_res,
5167 task);
5168}
5169
5170static const struct rpc_call_ops nfs4_delegreturn_ops = {
5171 .rpc_call_prepare = nfs4_delegreturn_prepare,
5172 .rpc_call_done = nfs4_delegreturn_done,
5173 .rpc_release = nfs4_delegreturn_release,
5174};
5175
5176static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5177{
5178 struct nfs4_delegreturndata *data;
5179 struct nfs_server *server = NFS_SERVER(inode);
5180 struct rpc_task *task;
5181 struct rpc_message msg = {
5182 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5183 .rpc_cred = cred,
5184 };
5185 struct rpc_task_setup task_setup_data = {
5186 .rpc_client = server->client,
5187 .rpc_message = &msg,
5188 .callback_ops = &nfs4_delegreturn_ops,
5189 .flags = RPC_TASK_ASYNC,
5190 };
5191 int status = 0;
5192
5193 data = kzalloc(sizeof(*data), GFP_NOFS);
5194 if (data == NULL)
5195 return -ENOMEM;
5196 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5197 data->args.fhandle = &data->fh;
5198 data->args.stateid = &data->stateid;
5199 data->args.bitmask = server->cache_consistency_bitmask;
5200 nfs_copy_fh(&data->fh, NFS_FH(inode));
5201 nfs4_stateid_copy(&data->stateid, stateid);
5202 data->res.fattr = &data->fattr;
5203 data->res.server = server;
5204 nfs_fattr_init(data->res.fattr);
5205 data->timestamp = jiffies;
5206 data->rpc_status = 0;
5207 data->inode = inode;
5208 data->roc = list_empty(&NFS_I(inode)->open_files) ?
5209 pnfs_roc(inode) : false;
5210
5211 task_setup_data.callback_data = data;
5212 msg.rpc_argp = &data->args;
5213 msg.rpc_resp = &data->res;
5214 task = rpc_run_task(&task_setup_data);
5215 if (IS_ERR(task))
5216 return PTR_ERR(task);
5217 if (!issync)
5218 goto out;
5219 status = nfs4_wait_for_completion_rpc_task(task);
5220 if (status != 0)
5221 goto out;
5222 status = data->rpc_status;
5223 if (status == 0)
5224 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5225 else
5226 nfs_refresh_inode(inode, &data->fattr);
5227out:
5228 rpc_put_task(task);
5229 return status;
5230}
5231
5232int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5233{
5234 struct nfs_server *server = NFS_SERVER(inode);
5235 struct nfs4_exception exception = { };
5236 int err;
5237 do {
5238 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5239 trace_nfs4_delegreturn(inode, err);
5240 switch (err) {
5241 case -NFS4ERR_STALE_STATEID:
5242 case -NFS4ERR_EXPIRED:
5243 case 0:
5244 return 0;
5245 }
5246 err = nfs4_handle_exception(server, err, &exception);
5247 } while (exception.retry);
5248 return err;
5249}
5250
5251#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5252#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5253
5254/*
5255 * sleep, with exponential backoff, and retry the LOCK operation.
5256 */
5257static unsigned long
5258nfs4_set_lock_task_retry(unsigned long timeout)
5259{
5260 freezable_schedule_timeout_killable_unsafe(timeout);
5261 timeout <<= 1;
5262 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5263 return NFS4_LOCK_MAXTIMEOUT;
5264 return timeout;
5265}
5266
5267static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5268{
5269 struct inode *inode = state->inode;
5270 struct nfs_server *server = NFS_SERVER(inode);
5271 struct nfs_client *clp = server->nfs_client;
5272 struct nfs_lockt_args arg = {
5273 .fh = NFS_FH(inode),
5274 .fl = request,
5275 };
5276 struct nfs_lockt_res res = {
5277 .denied = request,
5278 };
5279 struct rpc_message msg = {
5280 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5281 .rpc_argp = &arg,
5282 .rpc_resp = &res,
5283 .rpc_cred = state->owner->so_cred,
5284 };
5285 struct nfs4_lock_state *lsp;
5286 int status;
5287
5288 arg.lock_owner.clientid = clp->cl_clientid;
5289 status = nfs4_set_lock_state(state, request);
5290 if (status != 0)
5291 goto out;
5292 lsp = request->fl_u.nfs4_fl.owner;
5293 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5294 arg.lock_owner.s_dev = server->s_dev;
5295 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5296 switch (status) {
5297 case 0:
5298 request->fl_type = F_UNLCK;
5299 break;
5300 case -NFS4ERR_DENIED:
5301 status = 0;
5302 }
5303 request->fl_ops->fl_release_private(request);
5304 request->fl_ops = NULL;
5305out:
5306 return status;
5307}
5308
5309static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5310{
5311 struct nfs4_exception exception = { };
5312 int err;
5313
5314 do {
5315 err = _nfs4_proc_getlk(state, cmd, request);
5316 trace_nfs4_get_lock(request, state, cmd, err);
5317 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5318 &exception);
5319 } while (exception.retry);
5320 return err;
5321}
5322
5323static int do_vfs_lock(struct file *file, struct file_lock *fl)
5324{
5325 int res = 0;
5326 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5327 case FL_POSIX:
5328 res = posix_lock_file_wait(file, fl);
5329 break;
5330 case FL_FLOCK:
5331 res = flock_lock_file_wait(file, fl);
5332 break;
5333 default:
5334 BUG();
5335 }
5336 return res;
5337}
5338
5339struct nfs4_unlockdata {
5340 struct nfs_locku_args arg;
5341 struct nfs_locku_res res;
5342 struct nfs4_lock_state *lsp;
5343 struct nfs_open_context *ctx;
5344 struct file_lock fl;
5345 const struct nfs_server *server;
5346 unsigned long timestamp;
5347};
5348
5349static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5350 struct nfs_open_context *ctx,
5351 struct nfs4_lock_state *lsp,
5352 struct nfs_seqid *seqid)
5353{
5354 struct nfs4_unlockdata *p;
5355 struct inode *inode = lsp->ls_state->inode;
5356
5357 p = kzalloc(sizeof(*p), GFP_NOFS);
5358 if (p == NULL)
5359 return NULL;
5360 p->arg.fh = NFS_FH(inode);
5361 p->arg.fl = &p->fl;
5362 p->arg.seqid = seqid;
5363 p->res.seqid = seqid;
5364 p->lsp = lsp;
5365 atomic_inc(&lsp->ls_count);
5366 /* Ensure we don't close file until we're done freeing locks! */
5367 p->ctx = get_nfs_open_context(ctx);
5368 memcpy(&p->fl, fl, sizeof(p->fl));
5369 p->server = NFS_SERVER(inode);
5370 return p;
5371}
5372
5373static void nfs4_locku_release_calldata(void *data)
5374{
5375 struct nfs4_unlockdata *calldata = data;
5376 nfs_free_seqid(calldata->arg.seqid);
5377 nfs4_put_lock_state(calldata->lsp);
5378 put_nfs_open_context(calldata->ctx);
5379 kfree(calldata);
5380}
5381
5382static void nfs4_locku_done(struct rpc_task *task, void *data)
5383{
5384 struct nfs4_unlockdata *calldata = data;
5385
5386 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5387 return;
5388 switch (task->tk_status) {
5389 case 0:
5390 renew_lease(calldata->server, calldata->timestamp);
5391 do_vfs_lock(calldata->fl.fl_file, &calldata->fl);
5392 if (nfs4_update_lock_stateid(calldata->lsp,
5393 &calldata->res.stateid))
5394 break;
5395 case -NFS4ERR_BAD_STATEID:
5396 case -NFS4ERR_OLD_STATEID:
5397 case -NFS4ERR_STALE_STATEID:
5398 case -NFS4ERR_EXPIRED:
5399 if (!nfs4_stateid_match(&calldata->arg.stateid,
5400 &calldata->lsp->ls_stateid))
5401 rpc_restart_call_prepare(task);
5402 break;
5403 default:
5404 if (nfs4_async_handle_error(task, calldata->server,
5405 NULL, NULL) == -EAGAIN)
5406 rpc_restart_call_prepare(task);
5407 }
5408 nfs_release_seqid(calldata->arg.seqid);
5409}
5410
5411static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5412{
5413 struct nfs4_unlockdata *calldata = data;
5414
5415 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5416 goto out_wait;
5417 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5418 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5419 /* Note: exit _without_ running nfs4_locku_done */
5420 goto out_no_action;
5421 }
5422 calldata->timestamp = jiffies;
5423 if (nfs4_setup_sequence(calldata->server,
5424 &calldata->arg.seq_args,
5425 &calldata->res.seq_res,
5426 task) != 0)
5427 nfs_release_seqid(calldata->arg.seqid);
5428 return;
5429out_no_action:
5430 task->tk_action = NULL;
5431out_wait:
5432 nfs4_sequence_done(task, &calldata->res.seq_res);
5433}
5434
5435static const struct rpc_call_ops nfs4_locku_ops = {
5436 .rpc_call_prepare = nfs4_locku_prepare,
5437 .rpc_call_done = nfs4_locku_done,
5438 .rpc_release = nfs4_locku_release_calldata,
5439};
5440
5441static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5442 struct nfs_open_context *ctx,
5443 struct nfs4_lock_state *lsp,
5444 struct nfs_seqid *seqid)
5445{
5446 struct nfs4_unlockdata *data;
5447 struct rpc_message msg = {
5448 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5449 .rpc_cred = ctx->cred,
5450 };
5451 struct rpc_task_setup task_setup_data = {
5452 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5453 .rpc_message = &msg,
5454 .callback_ops = &nfs4_locku_ops,
5455 .workqueue = nfsiod_workqueue,
5456 .flags = RPC_TASK_ASYNC,
5457 };
5458
5459 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5460 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5461
5462 /* Ensure this is an unlock - when canceling a lock, the
5463 * canceled lock is passed in, and it won't be an unlock.
5464 */
5465 fl->fl_type = F_UNLCK;
5466
5467 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5468 if (data == NULL) {
5469 nfs_free_seqid(seqid);
5470 return ERR_PTR(-ENOMEM);
5471 }
5472
5473 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5474 msg.rpc_argp = &data->arg;
5475 msg.rpc_resp = &data->res;
5476 task_setup_data.callback_data = data;
5477 return rpc_run_task(&task_setup_data);
5478}
5479
5480static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5481{
5482 struct inode *inode = state->inode;
5483 struct nfs4_state_owner *sp = state->owner;
5484 struct nfs_inode *nfsi = NFS_I(inode);
5485 struct nfs_seqid *seqid;
5486 struct nfs4_lock_state *lsp;
5487 struct rpc_task *task;
5488 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5489 int status = 0;
5490 unsigned char fl_flags = request->fl_flags;
5491
5492 status = nfs4_set_lock_state(state, request);
5493 /* Unlock _before_ we do the RPC call */
5494 request->fl_flags |= FL_EXISTS;
5495 /* Exclude nfs_delegation_claim_locks() */
5496 mutex_lock(&sp->so_delegreturn_mutex);
5497 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5498 down_read(&nfsi->rwsem);
5499 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5500 up_read(&nfsi->rwsem);
5501 mutex_unlock(&sp->so_delegreturn_mutex);
5502 goto out;
5503 }
5504 up_read(&nfsi->rwsem);
5505 mutex_unlock(&sp->so_delegreturn_mutex);
5506 if (status != 0)
5507 goto out;
5508 /* Is this a delegated lock? */
5509 lsp = request->fl_u.nfs4_fl.owner;
5510 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5511 goto out;
5512 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5513 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5514 status = -ENOMEM;
5515 if (IS_ERR(seqid))
5516 goto out;
5517 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5518 status = PTR_ERR(task);
5519 if (IS_ERR(task))
5520 goto out;
5521 status = nfs4_wait_for_completion_rpc_task(task);
5522 rpc_put_task(task);
5523out:
5524 request->fl_flags = fl_flags;
5525 trace_nfs4_unlock(request, state, F_SETLK, status);
5526 return status;
5527}
5528
5529struct nfs4_lockdata {
5530 struct nfs_lock_args arg;
5531 struct nfs_lock_res res;
5532 struct nfs4_lock_state *lsp;
5533 struct nfs_open_context *ctx;
5534 struct file_lock fl;
5535 unsigned long timestamp;
5536 int rpc_status;
5537 int cancelled;
5538 struct nfs_server *server;
5539};
5540
5541static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5542 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5543 gfp_t gfp_mask)
5544{
5545 struct nfs4_lockdata *p;
5546 struct inode *inode = lsp->ls_state->inode;
5547 struct nfs_server *server = NFS_SERVER(inode);
5548 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5549
5550 p = kzalloc(sizeof(*p), gfp_mask);
5551 if (p == NULL)
5552 return NULL;
5553
5554 p->arg.fh = NFS_FH(inode);
5555 p->arg.fl = &p->fl;
5556 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5557 if (IS_ERR(p->arg.open_seqid))
5558 goto out_free;
5559 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5560 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5561 if (IS_ERR(p->arg.lock_seqid))
5562 goto out_free_seqid;
5563 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5564 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5565 p->arg.lock_owner.s_dev = server->s_dev;
5566 p->res.lock_seqid = p->arg.lock_seqid;
5567 p->lsp = lsp;
5568 p->server = server;
5569 atomic_inc(&lsp->ls_count);
5570 p->ctx = get_nfs_open_context(ctx);
5571 memcpy(&p->fl, fl, sizeof(p->fl));
5572 return p;
5573out_free_seqid:
5574 nfs_free_seqid(p->arg.open_seqid);
5575out_free:
5576 kfree(p);
5577 return NULL;
5578}
5579
5580static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5581{
5582 struct nfs4_lockdata *data = calldata;
5583 struct nfs4_state *state = data->lsp->ls_state;
5584
5585 dprintk("%s: begin!\n", __func__);
5586 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5587 goto out_wait;
5588 /* Do we need to do an open_to_lock_owner? */
5589 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5590 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5591 goto out_release_lock_seqid;
5592 }
5593 nfs4_stateid_copy(&data->arg.open_stateid,
5594 &state->open_stateid);
5595 data->arg.new_lock_owner = 1;
5596 data->res.open_seqid = data->arg.open_seqid;
5597 } else {
5598 data->arg.new_lock_owner = 0;
5599 nfs4_stateid_copy(&data->arg.lock_stateid,
5600 &data->lsp->ls_stateid);
5601 }
5602 if (!nfs4_valid_open_stateid(state)) {
5603 data->rpc_status = -EBADF;
5604 task->tk_action = NULL;
5605 goto out_release_open_seqid;
5606 }
5607 data->timestamp = jiffies;
5608 if (nfs4_setup_sequence(data->server,
5609 &data->arg.seq_args,
5610 &data->res.seq_res,
5611 task) == 0)
5612 return;
5613out_release_open_seqid:
5614 nfs_release_seqid(data->arg.open_seqid);
5615out_release_lock_seqid:
5616 nfs_release_seqid(data->arg.lock_seqid);
5617out_wait:
5618 nfs4_sequence_done(task, &data->res.seq_res);
5619 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5620}
5621
5622static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5623{
5624 struct nfs4_lockdata *data = calldata;
5625 struct nfs4_lock_state *lsp = data->lsp;
5626
5627 dprintk("%s: begin!\n", __func__);
5628
5629 if (!nfs4_sequence_done(task, &data->res.seq_res))
5630 return;
5631
5632 data->rpc_status = task->tk_status;
5633 switch (task->tk_status) {
5634 case 0:
5635 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode),
5636 data->timestamp);
5637 if (data->arg.new_lock) {
5638 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5639 if (do_vfs_lock(data->fl.fl_file, &data->fl) < 0) {
5640 rpc_restart_call_prepare(task);
5641 break;
5642 }
5643 }
5644 if (data->arg.new_lock_owner != 0) {
5645 nfs_confirm_seqid(&lsp->ls_seqid, 0);
5646 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5647 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5648 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5649 rpc_restart_call_prepare(task);
5650 break;
5651 case -NFS4ERR_BAD_STATEID:
5652 case -NFS4ERR_OLD_STATEID:
5653 case -NFS4ERR_STALE_STATEID:
5654 case -NFS4ERR_EXPIRED:
5655 if (data->arg.new_lock_owner != 0) {
5656 if (!nfs4_stateid_match(&data->arg.open_stateid,
5657 &lsp->ls_state->open_stateid))
5658 rpc_restart_call_prepare(task);
5659 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5660 &lsp->ls_stateid))
5661 rpc_restart_call_prepare(task);
5662 }
5663 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5664}
5665
5666static void nfs4_lock_release(void *calldata)
5667{
5668 struct nfs4_lockdata *data = calldata;
5669
5670 dprintk("%s: begin!\n", __func__);
5671 nfs_free_seqid(data->arg.open_seqid);
5672 if (data->cancelled != 0) {
5673 struct rpc_task *task;
5674 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5675 data->arg.lock_seqid);
5676 if (!IS_ERR(task))
5677 rpc_put_task_async(task);
5678 dprintk("%s: cancelling lock!\n", __func__);
5679 } else
5680 nfs_free_seqid(data->arg.lock_seqid);
5681 nfs4_put_lock_state(data->lsp);
5682 put_nfs_open_context(data->ctx);
5683 kfree(data);
5684 dprintk("%s: done!\n", __func__);
5685}
5686
5687static const struct rpc_call_ops nfs4_lock_ops = {
5688 .rpc_call_prepare = nfs4_lock_prepare,
5689 .rpc_call_done = nfs4_lock_done,
5690 .rpc_release = nfs4_lock_release,
5691};
5692
5693static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5694{
5695 switch (error) {
5696 case -NFS4ERR_ADMIN_REVOKED:
5697 case -NFS4ERR_BAD_STATEID:
5698 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5699 if (new_lock_owner != 0 ||
5700 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5701 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5702 break;
5703 case -NFS4ERR_STALE_STATEID:
5704 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5705 case -NFS4ERR_EXPIRED:
5706 nfs4_schedule_lease_recovery(server->nfs_client);
5707 };
5708}
5709
5710static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5711{
5712 struct nfs4_lockdata *data;
5713 struct rpc_task *task;
5714 struct rpc_message msg = {
5715 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5716 .rpc_cred = state->owner->so_cred,
5717 };
5718 struct rpc_task_setup task_setup_data = {
5719 .rpc_client = NFS_CLIENT(state->inode),
5720 .rpc_message = &msg,
5721 .callback_ops = &nfs4_lock_ops,
5722 .workqueue = nfsiod_workqueue,
5723 .flags = RPC_TASK_ASYNC,
5724 };
5725 int ret;
5726
5727 dprintk("%s: begin!\n", __func__);
5728 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5729 fl->fl_u.nfs4_fl.owner,
5730 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5731 if (data == NULL)
5732 return -ENOMEM;
5733 if (IS_SETLKW(cmd))
5734 data->arg.block = 1;
5735 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5736 msg.rpc_argp = &data->arg;
5737 msg.rpc_resp = &data->res;
5738 task_setup_data.callback_data = data;
5739 if (recovery_type > NFS_LOCK_NEW) {
5740 if (recovery_type == NFS_LOCK_RECLAIM)
5741 data->arg.reclaim = NFS_LOCK_RECLAIM;
5742 nfs4_set_sequence_privileged(&data->arg.seq_args);
5743 } else
5744 data->arg.new_lock = 1;
5745 task = rpc_run_task(&task_setup_data);
5746 if (IS_ERR(task))
5747 return PTR_ERR(task);
5748 ret = nfs4_wait_for_completion_rpc_task(task);
5749 if (ret == 0) {
5750 ret = data->rpc_status;
5751 if (ret)
5752 nfs4_handle_setlk_error(data->server, data->lsp,
5753 data->arg.new_lock_owner, ret);
5754 } else
5755 data->cancelled = 1;
5756 rpc_put_task(task);
5757 dprintk("%s: done, ret = %d!\n", __func__, ret);
5758 return ret;
5759}
5760
5761static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5762{
5763 struct nfs_server *server = NFS_SERVER(state->inode);
5764 struct nfs4_exception exception = {
5765 .inode = state->inode,
5766 };
5767 int err;
5768
5769 do {
5770 /* Cache the lock if possible... */
5771 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5772 return 0;
5773 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5774 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5775 if (err != -NFS4ERR_DELAY)
5776 break;
5777 nfs4_handle_exception(server, err, &exception);
5778 } while (exception.retry);
5779 return err;
5780}
5781
5782static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5783{
5784 struct nfs_server *server = NFS_SERVER(state->inode);
5785 struct nfs4_exception exception = {
5786 .inode = state->inode,
5787 };
5788 int err;
5789
5790 err = nfs4_set_lock_state(state, request);
5791 if (err != 0)
5792 return err;
5793 if (!recover_lost_locks) {
5794 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5795 return 0;
5796 }
5797 do {
5798 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5799 return 0;
5800 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5801 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5802 switch (err) {
5803 default:
5804 goto out;
5805 case -NFS4ERR_GRACE:
5806 case -NFS4ERR_DELAY:
5807 nfs4_handle_exception(server, err, &exception);
5808 err = 0;
5809 }
5810 } while (exception.retry);
5811out:
5812 return err;
5813}
5814
5815#if defined(CONFIG_NFS_V4_1)
5816/**
5817 * nfs41_check_expired_locks - possibly free a lock stateid
5818 *
5819 * @state: NFSv4 state for an inode
5820 *
5821 * Returns NFS_OK if recovery for this stateid is now finished.
5822 * Otherwise a negative NFS4ERR value is returned.
5823 */
5824static int nfs41_check_expired_locks(struct nfs4_state *state)
5825{
5826 int status, ret = -NFS4ERR_BAD_STATEID;
5827 struct nfs4_lock_state *lsp;
5828 struct nfs_server *server = NFS_SERVER(state->inode);
5829
5830 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5831 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5832 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5833
5834 status = nfs41_test_stateid(server,
5835 &lsp->ls_stateid,
5836 cred);
5837 trace_nfs4_test_lock_stateid(state, lsp, status);
5838 if (status != NFS_OK) {
5839 /* Free the stateid unless the server
5840 * informs us the stateid is unrecognized. */
5841 if (status != -NFS4ERR_BAD_STATEID)
5842 nfs41_free_stateid(server,
5843 &lsp->ls_stateid,
5844 cred);
5845 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5846 ret = status;
5847 }
5848 }
5849 };
5850
5851 return ret;
5852}
5853
5854static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5855{
5856 int status = NFS_OK;
5857
5858 if (test_bit(LK_STATE_IN_USE, &state->flags))
5859 status = nfs41_check_expired_locks(state);
5860 if (status != NFS_OK)
5861 status = nfs4_lock_expired(state, request);
5862 return status;
5863}
5864#endif
5865
5866static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5867{
5868 struct nfs_inode *nfsi = NFS_I(state->inode);
5869 unsigned char fl_flags = request->fl_flags;
5870 int status = -ENOLCK;
5871
5872 if ((fl_flags & FL_POSIX) &&
5873 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5874 goto out;
5875 /* Is this a delegated open? */
5876 status = nfs4_set_lock_state(state, request);
5877 if (status != 0)
5878 goto out;
5879 request->fl_flags |= FL_ACCESS;
5880 status = do_vfs_lock(request->fl_file, request);
5881 if (status < 0)
5882 goto out;
5883 down_read(&nfsi->rwsem);
5884 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5885 /* Yes: cache locks! */
5886 /* ...but avoid races with delegation recall... */
5887 request->fl_flags = fl_flags & ~FL_SLEEP;
5888 status = do_vfs_lock(request->fl_file, request);
5889 up_read(&nfsi->rwsem);
5890 goto out;
5891 }
5892 up_read(&nfsi->rwsem);
5893 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5894out:
5895 request->fl_flags = fl_flags;
5896 return status;
5897}
5898
5899static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5900{
5901 struct nfs4_exception exception = {
5902 .state = state,
5903 .inode = state->inode,
5904 };
5905 int err;
5906
5907 do {
5908 err = _nfs4_proc_setlk(state, cmd, request);
5909 trace_nfs4_set_lock(request, state, cmd, err);
5910 if (err == -NFS4ERR_DENIED)
5911 err = -EAGAIN;
5912 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5913 err, &exception);
5914 } while (exception.retry);
5915 return err;
5916}
5917
5918static int
5919nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5920{
5921 struct nfs_open_context *ctx;
5922 struct nfs4_state *state;
5923 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5924 int status;
5925
5926 /* verify open state */
5927 ctx = nfs_file_open_context(filp);
5928 state = ctx->state;
5929
5930 if (request->fl_start < 0 || request->fl_end < 0)
5931 return -EINVAL;
5932
5933 if (IS_GETLK(cmd)) {
5934 if (state != NULL)
5935 return nfs4_proc_getlk(state, F_GETLK, request);
5936 return 0;
5937 }
5938
5939 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5940 return -EINVAL;
5941
5942 if (request->fl_type == F_UNLCK) {
5943 if (state != NULL)
5944 return nfs4_proc_unlck(state, cmd, request);
5945 return 0;
5946 }
5947
5948 if (state == NULL)
5949 return -ENOLCK;
5950 /*
5951 * Don't rely on the VFS having checked the file open mode,
5952 * since it won't do this for flock() locks.
5953 */
5954 switch (request->fl_type) {
5955 case F_RDLCK:
5956 if (!(filp->f_mode & FMODE_READ))
5957 return -EBADF;
5958 break;
5959 case F_WRLCK:
5960 if (!(filp->f_mode & FMODE_WRITE))
5961 return -EBADF;
5962 }
5963
5964 do {
5965 status = nfs4_proc_setlk(state, cmd, request);
5966 if ((status != -EAGAIN) || IS_SETLK(cmd))
5967 break;
5968 timeout = nfs4_set_lock_task_retry(timeout);
5969 status = -ERESTARTSYS;
5970 if (signalled())
5971 break;
5972 } while(status < 0);
5973 return status;
5974}
5975
5976int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5977{
5978 struct nfs_server *server = NFS_SERVER(state->inode);
5979 int err;
5980
5981 err = nfs4_set_lock_state(state, fl);
5982 if (err != 0)
5983 return err;
5984 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5985 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5986}
5987
5988struct nfs_release_lockowner_data {
5989 struct nfs4_lock_state *lsp;
5990 struct nfs_server *server;
5991 struct nfs_release_lockowner_args args;
5992 struct nfs_release_lockowner_res res;
5993 unsigned long timestamp;
5994};
5995
5996static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5997{
5998 struct nfs_release_lockowner_data *data = calldata;
5999 struct nfs_server *server = data->server;
6000 nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6001 &data->args.seq_args, &data->res.seq_res, task);
6002 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6003 data->timestamp = jiffies;
6004}
6005
6006static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6007{
6008 struct nfs_release_lockowner_data *data = calldata;
6009 struct nfs_server *server = data->server;
6010
6011 nfs40_sequence_done(task, &data->res.seq_res);
6012
6013 switch (task->tk_status) {
6014 case 0:
6015 renew_lease(server, data->timestamp);
6016 break;
6017 case -NFS4ERR_STALE_CLIENTID:
6018 case -NFS4ERR_EXPIRED:
6019 nfs4_schedule_lease_recovery(server->nfs_client);
6020 break;
6021 case -NFS4ERR_LEASE_MOVED:
6022 case -NFS4ERR_DELAY:
6023 if (nfs4_async_handle_error(task, server,
6024 NULL, NULL) == -EAGAIN)
6025 rpc_restart_call_prepare(task);
6026 }
6027}
6028
6029static void nfs4_release_lockowner_release(void *calldata)
6030{
6031 struct nfs_release_lockowner_data *data = calldata;
6032 nfs4_free_lock_state(data->server, data->lsp);
6033 kfree(calldata);
6034}
6035
6036static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6037 .rpc_call_prepare = nfs4_release_lockowner_prepare,
6038 .rpc_call_done = nfs4_release_lockowner_done,
6039 .rpc_release = nfs4_release_lockowner_release,
6040};
6041
6042static void
6043nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6044{
6045 struct nfs_release_lockowner_data *data;
6046 struct rpc_message msg = {
6047 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6048 };
6049
6050 if (server->nfs_client->cl_mvops->minor_version != 0)
6051 return;
6052
6053 data = kmalloc(sizeof(*data), GFP_NOFS);
6054 if (!data)
6055 return;
6056 data->lsp = lsp;
6057 data->server = server;
6058 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6059 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6060 data->args.lock_owner.s_dev = server->s_dev;
6061
6062 msg.rpc_argp = &data->args;
6063 msg.rpc_resp = &data->res;
6064 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6065 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6066}
6067
6068#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6069
6070static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6071 const void *buf, size_t buflen,
6072 int flags, int type)
6073{
6074 if (strcmp(key, "") != 0)
6075 return -EINVAL;
6076
6077 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6078}
6079
6080static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6081 void *buf, size_t buflen, int type)
6082{
6083 if (strcmp(key, "") != 0)
6084 return -EINVAL;
6085
6086 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6087}
6088
6089static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6090 size_t list_len, const char *name,
6091 size_t name_len, int type)
6092{
6093 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6094
6095 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6096 return 0;
6097
6098 if (list && len <= list_len)
6099 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6100 return len;
6101}
6102
6103#ifdef CONFIG_NFS_V4_SECURITY_LABEL
6104static inline int nfs4_server_supports_labels(struct nfs_server *server)
6105{
6106 return server->caps & NFS_CAP_SECURITY_LABEL;
6107}
6108
6109static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6110 const void *buf, size_t buflen,
6111 int flags, int type)
6112{
6113 if (security_ismaclabel(key))
6114 return nfs4_set_security_label(dentry, buf, buflen);
6115
6116 return -EOPNOTSUPP;
6117}
6118
6119static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6120 void *buf, size_t buflen, int type)
6121{
6122 if (security_ismaclabel(key))
6123 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6124 return -EOPNOTSUPP;
6125}
6126
6127static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6128 size_t list_len, const char *name,
6129 size_t name_len, int type)
6130{
6131 size_t len = 0;
6132
6133 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6134 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6135 if (list && len <= list_len)
6136 security_inode_listsecurity(dentry->d_inode, list, len);
6137 }
6138 return len;
6139}
6140
6141static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6142 .prefix = XATTR_SECURITY_PREFIX,
6143 .list = nfs4_xattr_list_nfs4_label,
6144 .get = nfs4_xattr_get_nfs4_label,
6145 .set = nfs4_xattr_set_nfs4_label,
6146};
6147#endif
6148
6149
6150/*
6151 * nfs_fhget will use either the mounted_on_fileid or the fileid
6152 */
6153static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6154{
6155 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6156 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6157 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6158 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6159 return;
6160
6161 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6162 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6163 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6164 fattr->nlink = 2;
6165}
6166
6167static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6168 const struct qstr *name,
6169 struct nfs4_fs_locations *fs_locations,
6170 struct page *page)
6171{
6172 struct nfs_server *server = NFS_SERVER(dir);
6173 u32 bitmask[3] = {
6174 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6175 };
6176 struct nfs4_fs_locations_arg args = {
6177 .dir_fh = NFS_FH(dir),
6178 .name = name,
6179 .page = page,
6180 .bitmask = bitmask,
6181 };
6182 struct nfs4_fs_locations_res res = {
6183 .fs_locations = fs_locations,
6184 };
6185 struct rpc_message msg = {
6186 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6187 .rpc_argp = &args,
6188 .rpc_resp = &res,
6189 };
6190 int status;
6191
6192 dprintk("%s: start\n", __func__);
6193
6194 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6195 * is not supported */
6196 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6197 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6198 else
6199 bitmask[0] |= FATTR4_WORD0_FILEID;
6200
6201 nfs_fattr_init(&fs_locations->fattr);
6202 fs_locations->server = server;
6203 fs_locations->nlocations = 0;
6204 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6205 dprintk("%s: returned status = %d\n", __func__, status);
6206 return status;
6207}
6208
6209int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6210 const struct qstr *name,
6211 struct nfs4_fs_locations *fs_locations,
6212 struct page *page)
6213{
6214 struct nfs4_exception exception = { };
6215 int err;
6216 do {
6217 err = _nfs4_proc_fs_locations(client, dir, name,
6218 fs_locations, page);
6219 trace_nfs4_get_fs_locations(dir, name, err);
6220 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6221 &exception);
6222 } while (exception.retry);
6223 return err;
6224}
6225
6226/*
6227 * This operation also signals the server that this client is
6228 * performing migration recovery. The server can stop returning
6229 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
6230 * appended to this compound to identify the client ID which is
6231 * performing recovery.
6232 */
6233static int _nfs40_proc_get_locations(struct inode *inode,
6234 struct nfs4_fs_locations *locations,
6235 struct page *page, struct rpc_cred *cred)
6236{
6237 struct nfs_server *server = NFS_SERVER(inode);
6238 struct rpc_clnt *clnt = server->client;
6239 u32 bitmask[2] = {
6240 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6241 };
6242 struct nfs4_fs_locations_arg args = {
6243 .clientid = server->nfs_client->cl_clientid,
6244 .fh = NFS_FH(inode),
6245 .page = page,
6246 .bitmask = bitmask,
6247 .migration = 1, /* skip LOOKUP */
6248 .renew = 1, /* append RENEW */
6249 };
6250 struct nfs4_fs_locations_res res = {
6251 .fs_locations = locations,
6252 .migration = 1,
6253 .renew = 1,
6254 };
6255 struct rpc_message msg = {
6256 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6257 .rpc_argp = &args,
6258 .rpc_resp = &res,
6259 .rpc_cred = cred,
6260 };
6261 unsigned long now = jiffies;
6262 int status;
6263
6264 nfs_fattr_init(&locations->fattr);
6265 locations->server = server;
6266 locations->nlocations = 0;
6267
6268 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6269 nfs4_set_sequence_privileged(&args.seq_args);
6270 status = nfs4_call_sync_sequence(clnt, server, &msg,
6271 &args.seq_args, &res.seq_res);
6272 if (status)
6273 return status;
6274
6275 renew_lease(server, now);
6276 return 0;
6277}
6278
6279#ifdef CONFIG_NFS_V4_1
6280
6281/*
6282 * This operation also signals the server that this client is
6283 * performing migration recovery. The server can stop asserting
6284 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
6285 * performing this operation is identified in the SEQUENCE
6286 * operation in this compound.
6287 *
6288 * When the client supports GETATTR(fs_locations_info), it can
6289 * be plumbed in here.
6290 */
6291static int _nfs41_proc_get_locations(struct inode *inode,
6292 struct nfs4_fs_locations *locations,
6293 struct page *page, struct rpc_cred *cred)
6294{
6295 struct nfs_server *server = NFS_SERVER(inode);
6296 struct rpc_clnt *clnt = server->client;
6297 u32 bitmask[2] = {
6298 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6299 };
6300 struct nfs4_fs_locations_arg args = {
6301 .fh = NFS_FH(inode),
6302 .page = page,
6303 .bitmask = bitmask,
6304 .migration = 1, /* skip LOOKUP */
6305 };
6306 struct nfs4_fs_locations_res res = {
6307 .fs_locations = locations,
6308 .migration = 1,
6309 };
6310 struct rpc_message msg = {
6311 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6312 .rpc_argp = &args,
6313 .rpc_resp = &res,
6314 .rpc_cred = cred,
6315 };
6316 int status;
6317
6318 nfs_fattr_init(&locations->fattr);
6319 locations->server = server;
6320 locations->nlocations = 0;
6321
6322 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6323 nfs4_set_sequence_privileged(&args.seq_args);
6324 status = nfs4_call_sync_sequence(clnt, server, &msg,
6325 &args.seq_args, &res.seq_res);
6326 if (status == NFS4_OK &&
6327 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6328 status = -NFS4ERR_LEASE_MOVED;
6329 return status;
6330}
6331
6332#endif /* CONFIG_NFS_V4_1 */
6333
6334/**
6335 * nfs4_proc_get_locations - discover locations for a migrated FSID
6336 * @inode: inode on FSID that is migrating
6337 * @locations: result of query
6338 * @page: buffer
6339 * @cred: credential to use for this operation
6340 *
6341 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6342 * operation failed, or a negative errno if a local error occurred.
6343 *
6344 * On success, "locations" is filled in, but if the server has
6345 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6346 * asserted.
6347 *
6348 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6349 * from this client that require migration recovery.
6350 */
6351int nfs4_proc_get_locations(struct inode *inode,
6352 struct nfs4_fs_locations *locations,
6353 struct page *page, struct rpc_cred *cred)
6354{
6355 struct nfs_server *server = NFS_SERVER(inode);
6356 struct nfs_client *clp = server->nfs_client;
6357 const struct nfs4_mig_recovery_ops *ops =
6358 clp->cl_mvops->mig_recovery_ops;
6359 struct nfs4_exception exception = { };
6360 int status;
6361
6362 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6363 (unsigned long long)server->fsid.major,
6364 (unsigned long long)server->fsid.minor,
6365 clp->cl_hostname);
6366 nfs_display_fhandle(NFS_FH(inode), __func__);
6367
6368 do {
6369 status = ops->get_locations(inode, locations, page, cred);
6370 if (status != -NFS4ERR_DELAY)
6371 break;
6372 nfs4_handle_exception(server, status, &exception);
6373 } while (exception.retry);
6374 return status;
6375}
6376
6377/*
6378 * This operation also signals the server that this client is
6379 * performing "lease moved" recovery. The server can stop
6380 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
6381 * is appended to this compound to identify the client ID which is
6382 * performing recovery.
6383 */
6384static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6385{
6386 struct nfs_server *server = NFS_SERVER(inode);
6387 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6388 struct rpc_clnt *clnt = server->client;
6389 struct nfs4_fsid_present_arg args = {
6390 .fh = NFS_FH(inode),
6391 .clientid = clp->cl_clientid,
6392 .renew = 1, /* append RENEW */
6393 };
6394 struct nfs4_fsid_present_res res = {
6395 .renew = 1,
6396 };
6397 struct rpc_message msg = {
6398 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6399 .rpc_argp = &args,
6400 .rpc_resp = &res,
6401 .rpc_cred = cred,
6402 };
6403 unsigned long now = jiffies;
6404 int status;
6405
6406 res.fh = nfs_alloc_fhandle();
6407 if (res.fh == NULL)
6408 return -ENOMEM;
6409
6410 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6411 nfs4_set_sequence_privileged(&args.seq_args);
6412 status = nfs4_call_sync_sequence(clnt, server, &msg,
6413 &args.seq_args, &res.seq_res);
6414 nfs_free_fhandle(res.fh);
6415 if (status)
6416 return status;
6417
6418 do_renew_lease(clp, now);
6419 return 0;
6420}
6421
6422#ifdef CONFIG_NFS_V4_1
6423
6424/*
6425 * This operation also signals the server that this client is
6426 * performing "lease moved" recovery. The server can stop asserting
6427 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
6428 * this operation is identified in the SEQUENCE operation in this
6429 * compound.
6430 */
6431static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6432{
6433 struct nfs_server *server = NFS_SERVER(inode);
6434 struct rpc_clnt *clnt = server->client;
6435 struct nfs4_fsid_present_arg args = {
6436 .fh = NFS_FH(inode),
6437 };
6438 struct nfs4_fsid_present_res res = {
6439 };
6440 struct rpc_message msg = {
6441 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6442 .rpc_argp = &args,
6443 .rpc_resp = &res,
6444 .rpc_cred = cred,
6445 };
6446 int status;
6447
6448 res.fh = nfs_alloc_fhandle();
6449 if (res.fh == NULL)
6450 return -ENOMEM;
6451
6452 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6453 nfs4_set_sequence_privileged(&args.seq_args);
6454 status = nfs4_call_sync_sequence(clnt, server, &msg,
6455 &args.seq_args, &res.seq_res);
6456 nfs_free_fhandle(res.fh);
6457 if (status == NFS4_OK &&
6458 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6459 status = -NFS4ERR_LEASE_MOVED;
6460 return status;
6461}
6462
6463#endif /* CONFIG_NFS_V4_1 */
6464
6465/**
6466 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6467 * @inode: inode on FSID to check
6468 * @cred: credential to use for this operation
6469 *
6470 * Server indicates whether the FSID is present, moved, or not
6471 * recognized. This operation is necessary to clear a LEASE_MOVED
6472 * condition for this client ID.
6473 *
6474 * Returns NFS4_OK if the FSID is present on this server,
6475 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6476 * NFS4ERR code if some error occurred on the server, or a
6477 * negative errno if a local failure occurred.
6478 */
6479int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6480{
6481 struct nfs_server *server = NFS_SERVER(inode);
6482 struct nfs_client *clp = server->nfs_client;
6483 const struct nfs4_mig_recovery_ops *ops =
6484 clp->cl_mvops->mig_recovery_ops;
6485 struct nfs4_exception exception = { };
6486 int status;
6487
6488 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6489 (unsigned long long)server->fsid.major,
6490 (unsigned long long)server->fsid.minor,
6491 clp->cl_hostname);
6492 nfs_display_fhandle(NFS_FH(inode), __func__);
6493
6494 do {
6495 status = ops->fsid_present(inode, cred);
6496 if (status != -NFS4ERR_DELAY)
6497 break;
6498 nfs4_handle_exception(server, status, &exception);
6499 } while (exception.retry);
6500 return status;
6501}
6502
6503/**
6504 * If 'use_integrity' is true and the state managment nfs_client
6505 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6506 * and the machine credential as per RFC3530bis and RFC5661 Security
6507 * Considerations sections. Otherwise, just use the user cred with the
6508 * filesystem's rpc_client.
6509 */
6510static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6511{
6512 int status;
6513 struct nfs4_secinfo_arg args = {
6514 .dir_fh = NFS_FH(dir),
6515 .name = name,
6516 };
6517 struct nfs4_secinfo_res res = {
6518 .flavors = flavors,
6519 };
6520 struct rpc_message msg = {
6521 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6522 .rpc_argp = &args,
6523 .rpc_resp = &res,
6524 };
6525 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6526 struct rpc_cred *cred = NULL;
6527
6528 if (use_integrity) {
6529 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6530 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6531 msg.rpc_cred = cred;
6532 }
6533
6534 dprintk("NFS call secinfo %s\n", name->name);
6535
6536 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6537 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6538
6539 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6540 &res.seq_res, 0);
6541 dprintk("NFS reply secinfo: %d\n", status);
6542
6543 if (cred)
6544 put_rpccred(cred);
6545
6546 return status;
6547}
6548
6549int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6550 struct nfs4_secinfo_flavors *flavors)
6551{
6552 struct nfs4_exception exception = { };
6553 int err;
6554 do {
6555 err = -NFS4ERR_WRONGSEC;
6556
6557 /* try to use integrity protection with machine cred */
6558 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6559 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6560
6561 /*
6562 * if unable to use integrity protection, or SECINFO with
6563 * integrity protection returns NFS4ERR_WRONGSEC (which is
6564 * disallowed by spec, but exists in deployed servers) use
6565 * the current filesystem's rpc_client and the user cred.
6566 */
6567 if (err == -NFS4ERR_WRONGSEC)
6568 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6569
6570 trace_nfs4_secinfo(dir, name, err);
6571 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6572 &exception);
6573 } while (exception.retry);
6574 return err;
6575}
6576
6577#ifdef CONFIG_NFS_V4_1
6578/*
6579 * Check the exchange flags returned by the server for invalid flags, having
6580 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6581 * DS flags set.
6582 */
6583static int nfs4_check_cl_exchange_flags(u32 flags)
6584{
6585 if (flags & ~EXCHGID4_FLAG_MASK_R)
6586 goto out_inval;
6587 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6588 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6589 goto out_inval;
6590 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6591 goto out_inval;
6592 return NFS_OK;
6593out_inval:
6594 return -NFS4ERR_INVAL;
6595}
6596
6597static bool
6598nfs41_same_server_scope(struct nfs41_server_scope *a,
6599 struct nfs41_server_scope *b)
6600{
6601 if (a->server_scope_sz == b->server_scope_sz &&
6602 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6603 return true;
6604
6605 return false;
6606}
6607
6608/*
6609 * nfs4_proc_bind_conn_to_session()
6610 *
6611 * The 4.1 client currently uses the same TCP connection for the
6612 * fore and backchannel.
6613 */
6614int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6615{
6616 int status;
6617 struct nfs41_bind_conn_to_session_res res;
6618 struct rpc_message msg = {
6619 .rpc_proc =
6620 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6621 .rpc_argp = clp,
6622 .rpc_resp = &res,
6623 .rpc_cred = cred,
6624 };
6625
6626 dprintk("--> %s\n", __func__);
6627
6628 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6629 if (unlikely(res.session == NULL)) {
6630 status = -ENOMEM;
6631 goto out;
6632 }
6633
6634 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6635 trace_nfs4_bind_conn_to_session(clp, status);
6636 if (status == 0) {
6637 if (memcmp(res.session->sess_id.data,
6638 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6639 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6640 status = -EIO;
6641 goto out_session;
6642 }
6643 if (res.dir != NFS4_CDFS4_BOTH) {
6644 dprintk("NFS: %s: Unexpected direction from server\n",
6645 __func__);
6646 status = -EIO;
6647 goto out_session;
6648 }
6649 if (res.use_conn_in_rdma_mode) {
6650 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6651 __func__);
6652 status = -EIO;
6653 goto out_session;
6654 }
6655 }
6656out_session:
6657 kfree(res.session);
6658out:
6659 dprintk("<-- %s status= %d\n", __func__, status);
6660 return status;
6661}
6662
6663/*
6664 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6665 * and operations we'd like to see to enable certain features in the allow map
6666 */
6667static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6668 .how = SP4_MACH_CRED,
6669 .enforce.u.words = {
6670 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6671 1 << (OP_EXCHANGE_ID - 32) |
6672 1 << (OP_CREATE_SESSION - 32) |
6673 1 << (OP_DESTROY_SESSION - 32) |
6674 1 << (OP_DESTROY_CLIENTID - 32)
6675 },
6676 .allow.u.words = {
6677 [0] = 1 << (OP_CLOSE) |
6678 1 << (OP_LOCKU) |
6679 1 << (OP_COMMIT),
6680 [1] = 1 << (OP_SECINFO - 32) |
6681 1 << (OP_SECINFO_NO_NAME - 32) |
6682 1 << (OP_TEST_STATEID - 32) |
6683 1 << (OP_FREE_STATEID - 32) |
6684 1 << (OP_WRITE - 32)
6685 }
6686};
6687
6688/*
6689 * Select the state protection mode for client `clp' given the server results
6690 * from exchange_id in `sp'.
6691 *
6692 * Returns 0 on success, negative errno otherwise.
6693 */
6694static int nfs4_sp4_select_mode(struct nfs_client *clp,
6695 struct nfs41_state_protection *sp)
6696{
6697 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6698 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6699 1 << (OP_EXCHANGE_ID - 32) |
6700 1 << (OP_CREATE_SESSION - 32) |
6701 1 << (OP_DESTROY_SESSION - 32) |
6702 1 << (OP_DESTROY_CLIENTID - 32)
6703 };
6704 unsigned int i;
6705
6706 if (sp->how == SP4_MACH_CRED) {
6707 /* Print state protect result */
6708 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6709 for (i = 0; i <= LAST_NFS4_OP; i++) {
6710 if (test_bit(i, sp->enforce.u.longs))
6711 dfprintk(MOUNT, " enforce op %d\n", i);
6712 if (test_bit(i, sp->allow.u.longs))
6713 dfprintk(MOUNT, " allow op %d\n", i);
6714 }
6715
6716 /* make sure nothing is on enforce list that isn't supported */
6717 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6718 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6719 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6720 return -EINVAL;
6721 }
6722 }
6723
6724 /*
6725 * Minimal mode - state operations are allowed to use machine
6726 * credential. Note this already happens by default, so the
6727 * client doesn't have to do anything more than the negotiation.
6728 *
6729 * NOTE: we don't care if EXCHANGE_ID is in the list -
6730 * we're already using the machine cred for exchange_id
6731 * and will never use a different cred.
6732 */
6733 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6734 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6735 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6736 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6737 dfprintk(MOUNT, "sp4_mach_cred:\n");
6738 dfprintk(MOUNT, " minimal mode enabled\n");
6739 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6740 } else {
6741 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6742 return -EINVAL;
6743 }
6744
6745 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6746 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6747 dfprintk(MOUNT, " cleanup mode enabled\n");
6748 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6749 }
6750
6751 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6752 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6753 dfprintk(MOUNT, " secinfo mode enabled\n");
6754 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6755 }
6756
6757 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6758 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6759 dfprintk(MOUNT, " stateid mode enabled\n");
6760 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6761 }
6762
6763 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6764 dfprintk(MOUNT, " write mode enabled\n");
6765 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6766 }
6767
6768 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6769 dfprintk(MOUNT, " commit mode enabled\n");
6770 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6771 }
6772 }
6773
6774 return 0;
6775}
6776
6777/*
6778 * _nfs4_proc_exchange_id()
6779 *
6780 * Wrapper for EXCHANGE_ID operation.
6781 */
6782static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6783 u32 sp4_how)
6784{
6785 nfs4_verifier verifier;
6786 struct nfs41_exchange_id_args args = {
6787 .verifier = &verifier,
6788 .client = clp,
6789#ifdef CONFIG_NFS_V4_1_MIGRATION
6790 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6791 EXCHGID4_FLAG_BIND_PRINC_STATEID |
6792 EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6793#else
6794 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6795 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6796#endif
6797 };
6798 struct nfs41_exchange_id_res res = {
6799 0
6800 };
6801 int status;
6802 struct rpc_message msg = {
6803 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6804 .rpc_argp = &args,
6805 .rpc_resp = &res,
6806 .rpc_cred = cred,
6807 };
6808
6809 nfs4_init_boot_verifier(clp, &verifier);
6810 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6811 sizeof(args.id));
6812 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6813 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6814 args.id_len, args.id);
6815
6816 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6817 GFP_NOFS);
6818 if (unlikely(res.server_owner == NULL)) {
6819 status = -ENOMEM;
6820 goto out;
6821 }
6822
6823 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6824 GFP_NOFS);
6825 if (unlikely(res.server_scope == NULL)) {
6826 status = -ENOMEM;
6827 goto out_server_owner;
6828 }
6829
6830 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6831 if (unlikely(res.impl_id == NULL)) {
6832 status = -ENOMEM;
6833 goto out_server_scope;
6834 }
6835
6836 switch (sp4_how) {
6837 case SP4_NONE:
6838 args.state_protect.how = SP4_NONE;
6839 break;
6840
6841 case SP4_MACH_CRED:
6842 args.state_protect = nfs4_sp4_mach_cred_request;
6843 break;
6844
6845 default:
6846 /* unsupported! */
6847 WARN_ON_ONCE(1);
6848 status = -EINVAL;
6849 goto out_server_scope;
6850 }
6851
6852 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6853 trace_nfs4_exchange_id(clp, status);
6854 if (status == 0)
6855 status = nfs4_check_cl_exchange_flags(res.flags);
6856
6857 if (status == 0)
6858 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6859
6860 if (status == 0) {
6861 clp->cl_clientid = res.clientid;
6862 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6863 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6864 clp->cl_seqid = res.seqid;
6865
6866 kfree(clp->cl_serverowner);
6867 clp->cl_serverowner = res.server_owner;
6868 res.server_owner = NULL;
6869
6870 /* use the most recent implementation id */
6871 kfree(clp->cl_implid);
6872 clp->cl_implid = res.impl_id;
6873
6874 if (clp->cl_serverscope != NULL &&
6875 !nfs41_same_server_scope(clp->cl_serverscope,
6876 res.server_scope)) {
6877 dprintk("%s: server_scope mismatch detected\n",
6878 __func__);
6879 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6880 kfree(clp->cl_serverscope);
6881 clp->cl_serverscope = NULL;
6882 }
6883
6884 if (clp->cl_serverscope == NULL) {
6885 clp->cl_serverscope = res.server_scope;
6886 goto out;
6887 }
6888 } else
6889 kfree(res.impl_id);
6890
6891out_server_owner:
6892 kfree(res.server_owner);
6893out_server_scope:
6894 kfree(res.server_scope);
6895out:
6896 if (clp->cl_implid != NULL)
6897 dprintk("NFS reply exchange_id: Server Implementation ID: "
6898 "domain: %s, name: %s, date: %llu,%u\n",
6899 clp->cl_implid->domain, clp->cl_implid->name,
6900 clp->cl_implid->date.seconds,
6901 clp->cl_implid->date.nseconds);
6902 dprintk("NFS reply exchange_id: %d\n", status);
6903 return status;
6904}
6905
6906/*
6907 * nfs4_proc_exchange_id()
6908 *
6909 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6910 *
6911 * Since the clientid has expired, all compounds using sessions
6912 * associated with the stale clientid will be returning
6913 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6914 * be in some phase of session reset.
6915 *
6916 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6917 */
6918int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6919{
6920 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6921 int status;
6922
6923 /* try SP4_MACH_CRED if krb5i/p */
6924 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6925 authflavor == RPC_AUTH_GSS_KRB5P) {
6926 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6927 if (!status)
6928 return 0;
6929 }
6930
6931 /* try SP4_NONE */
6932 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6933}
6934
6935static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6936 struct rpc_cred *cred)
6937{
6938 struct rpc_message msg = {
6939 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6940 .rpc_argp = clp,
6941 .rpc_cred = cred,
6942 };
6943 int status;
6944
6945 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6946 trace_nfs4_destroy_clientid(clp, status);
6947 if (status)
6948 dprintk("NFS: Got error %d from the server %s on "
6949 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6950 return status;
6951}
6952
6953static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6954 struct rpc_cred *cred)
6955{
6956 unsigned int loop;
6957 int ret;
6958
6959 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6960 ret = _nfs4_proc_destroy_clientid(clp, cred);
6961 switch (ret) {
6962 case -NFS4ERR_DELAY:
6963 case -NFS4ERR_CLIENTID_BUSY:
6964 ssleep(1);
6965 break;
6966 default:
6967 return ret;
6968 }
6969 }
6970 return 0;
6971}
6972
6973int nfs4_destroy_clientid(struct nfs_client *clp)
6974{
6975 struct rpc_cred *cred;
6976 int ret = 0;
6977
6978 if (clp->cl_mvops->minor_version < 1)
6979 goto out;
6980 if (clp->cl_exchange_flags == 0)
6981 goto out;
6982 if (clp->cl_preserve_clid)
6983 goto out;
6984 cred = nfs4_get_clid_cred(clp);
6985 ret = nfs4_proc_destroy_clientid(clp, cred);
6986 if (cred)
6987 put_rpccred(cred);
6988 switch (ret) {
6989 case 0:
6990 case -NFS4ERR_STALE_CLIENTID:
6991 clp->cl_exchange_flags = 0;
6992 }
6993out:
6994 return ret;
6995}
6996
6997struct nfs4_get_lease_time_data {
6998 struct nfs4_get_lease_time_args *args;
6999 struct nfs4_get_lease_time_res *res;
7000 struct nfs_client *clp;
7001};
7002
7003static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7004 void *calldata)
7005{
7006 struct nfs4_get_lease_time_data *data =
7007 (struct nfs4_get_lease_time_data *)calldata;
7008
7009 dprintk("--> %s\n", __func__);
7010 /* just setup sequence, do not trigger session recovery
7011 since we're invoked within one */
7012 nfs41_setup_sequence(data->clp->cl_session,
7013 &data->args->la_seq_args,
7014 &data->res->lr_seq_res,
7015 task);
7016 dprintk("<-- %s\n", __func__);
7017}
7018
7019/*
7020 * Called from nfs4_state_manager thread for session setup, so don't recover
7021 * from sequence operation or clientid errors.
7022 */
7023static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7024{
7025 struct nfs4_get_lease_time_data *data =
7026 (struct nfs4_get_lease_time_data *)calldata;
7027
7028 dprintk("--> %s\n", __func__);
7029 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7030 return;
7031 switch (task->tk_status) {
7032 case -NFS4ERR_DELAY:
7033 case -NFS4ERR_GRACE:
7034 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7035 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7036 task->tk_status = 0;
7037 /* fall through */
7038 case -NFS4ERR_RETRY_UNCACHED_REP:
7039 rpc_restart_call_prepare(task);
7040 return;
7041 }
7042 dprintk("<-- %s\n", __func__);
7043}
7044
7045static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7046 .rpc_call_prepare = nfs4_get_lease_time_prepare,
7047 .rpc_call_done = nfs4_get_lease_time_done,
7048};
7049
7050int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7051{
7052 struct rpc_task *task;
7053 struct nfs4_get_lease_time_args args;
7054 struct nfs4_get_lease_time_res res = {
7055 .lr_fsinfo = fsinfo,
7056 };
7057 struct nfs4_get_lease_time_data data = {
7058 .args = &args,
7059 .res = &res,
7060 .clp = clp,
7061 };
7062 struct rpc_message msg = {
7063 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7064 .rpc_argp = &args,
7065 .rpc_resp = &res,
7066 };
7067 struct rpc_task_setup task_setup = {
7068 .rpc_client = clp->cl_rpcclient,
7069 .rpc_message = &msg,
7070 .callback_ops = &nfs4_get_lease_time_ops,
7071 .callback_data = &data,
7072 .flags = RPC_TASK_TIMEOUT,
7073 };
7074 int status;
7075
7076 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7077 nfs4_set_sequence_privileged(&args.la_seq_args);
7078 dprintk("--> %s\n", __func__);
7079 task = rpc_run_task(&task_setup);
7080
7081 if (IS_ERR(task))
7082 status = PTR_ERR(task);
7083 else {
7084 status = task->tk_status;
7085 rpc_put_task(task);
7086 }
7087 dprintk("<-- %s return %d\n", __func__, status);
7088
7089 return status;
7090}
7091
7092/*
7093 * Initialize the values to be used by the client in CREATE_SESSION
7094 * If nfs4_init_session set the fore channel request and response sizes,
7095 * use them.
7096 *
7097 * Set the back channel max_resp_sz_cached to zero to force the client to
7098 * always set csa_cachethis to FALSE because the current implementation
7099 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7100 */
7101static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7102{
7103 unsigned int max_rqst_sz, max_resp_sz;
7104
7105 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7106 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7107
7108 /* Fore channel attributes */
7109 args->fc_attrs.max_rqst_sz = max_rqst_sz;
7110 args->fc_attrs.max_resp_sz = max_resp_sz;
7111 args->fc_attrs.max_ops = NFS4_MAX_OPS;
7112 args->fc_attrs.max_reqs = max_session_slots;
7113
7114 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7115 "max_ops=%u max_reqs=%u\n",
7116 __func__,
7117 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7118 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7119
7120 /* Back channel attributes */
7121 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7122 args->bc_attrs.max_resp_sz = PAGE_SIZE;
7123 args->bc_attrs.max_resp_sz_cached = 0;
7124 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7125 args->bc_attrs.max_reqs = 1;
7126
7127 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7128 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7129 __func__,
7130 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7131 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7132 args->bc_attrs.max_reqs);
7133}
7134
7135static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7136{
7137 struct nfs4_channel_attrs *sent = &args->fc_attrs;
7138 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7139
7140 if (rcvd->max_resp_sz > sent->max_resp_sz)
7141 return -EINVAL;
7142 /*
7143 * Our requested max_ops is the minimum we need; we're not
7144 * prepared to break up compounds into smaller pieces than that.
7145 * So, no point even trying to continue if the server won't
7146 * cooperate:
7147 */
7148 if (rcvd->max_ops < sent->max_ops)
7149 return -EINVAL;
7150 if (rcvd->max_reqs == 0)
7151 return -EINVAL;
7152 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7153 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7154 return 0;
7155}
7156
7157static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7158{
7159 struct nfs4_channel_attrs *sent = &args->bc_attrs;
7160 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7161
7162 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7163 return -EINVAL;
7164 if (rcvd->max_resp_sz < sent->max_resp_sz)
7165 return -EINVAL;
7166 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7167 return -EINVAL;
7168 /* These would render the backchannel useless: */
7169 if (rcvd->max_ops != sent->max_ops)
7170 return -EINVAL;
7171 if (rcvd->max_reqs != sent->max_reqs)
7172 return -EINVAL;
7173 return 0;
7174}
7175
7176static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7177 struct nfs4_session *session)
7178{
7179 int ret;
7180
7181 ret = nfs4_verify_fore_channel_attrs(args, session);
7182 if (ret)
7183 return ret;
7184 return nfs4_verify_back_channel_attrs(args, session);
7185}
7186
7187static int _nfs4_proc_create_session(struct nfs_client *clp,
7188 struct rpc_cred *cred)
7189{
7190 struct nfs4_session *session = clp->cl_session;
7191 struct nfs41_create_session_args args = {
7192 .client = clp,
7193 .cb_program = NFS4_CALLBACK,
7194 };
7195 struct nfs41_create_session_res res = {
7196 .client = clp,
7197 };
7198 struct rpc_message msg = {
7199 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7200 .rpc_argp = &args,
7201 .rpc_resp = &res,
7202 .rpc_cred = cred,
7203 };
7204 int status;
7205
7206 nfs4_init_channel_attrs(&args);
7207 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7208
7209 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7210 trace_nfs4_create_session(clp, status);
7211
7212 if (!status) {
7213 /* Verify the session's negotiated channel_attrs values */
7214 status = nfs4_verify_channel_attrs(&args, session);
7215 /* Increment the clientid slot sequence id */
7216 clp->cl_seqid++;
7217 }
7218
7219 return status;
7220}
7221
7222/*
7223 * Issues a CREATE_SESSION operation to the server.
7224 * It is the responsibility of the caller to verify the session is
7225 * expired before calling this routine.
7226 */
7227int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7228{
7229 int status;
7230 unsigned *ptr;
7231 struct nfs4_session *session = clp->cl_session;
7232
7233 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7234
7235 status = _nfs4_proc_create_session(clp, cred);
7236 if (status)
7237 goto out;
7238
7239 /* Init or reset the session slot tables */
7240 status = nfs4_setup_session_slot_tables(session);
7241 dprintk("slot table setup returned %d\n", status);
7242 if (status)
7243 goto out;
7244
7245 ptr = (unsigned *)&session->sess_id.data[0];
7246 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7247 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7248out:
7249 dprintk("<-- %s\n", __func__);
7250 return status;
7251}
7252
7253/*
7254 * Issue the over-the-wire RPC DESTROY_SESSION.
7255 * The caller must serialize access to this routine.
7256 */
7257int nfs4_proc_destroy_session(struct nfs4_session *session,
7258 struct rpc_cred *cred)
7259{
7260 struct rpc_message msg = {
7261 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7262 .rpc_argp = session,
7263 .rpc_cred = cred,
7264 };
7265 int status = 0;
7266
7267 dprintk("--> nfs4_proc_destroy_session\n");
7268
7269 /* session is still being setup */
7270 if (session->clp->cl_cons_state != NFS_CS_READY)
7271 return status;
7272
7273 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7274 trace_nfs4_destroy_session(session->clp, status);
7275
7276 if (status)
7277 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7278 "Session has been destroyed regardless...\n", status);
7279
7280 dprintk("<-- nfs4_proc_destroy_session\n");
7281 return status;
7282}
7283
7284/*
7285 * Renew the cl_session lease.
7286 */
7287struct nfs4_sequence_data {
7288 struct nfs_client *clp;
7289 struct nfs4_sequence_args args;
7290 struct nfs4_sequence_res res;
7291};
7292
7293static void nfs41_sequence_release(void *data)
7294{
7295 struct nfs4_sequence_data *calldata = data;
7296 struct nfs_client *clp = calldata->clp;
7297
7298 if (atomic_read(&clp->cl_count) > 1)
7299 nfs4_schedule_state_renewal(clp);
7300 nfs_put_client(clp);
7301 kfree(calldata);
7302}
7303
7304static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7305{
7306 switch(task->tk_status) {
7307 case -NFS4ERR_DELAY:
7308 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7309 return -EAGAIN;
7310 default:
7311 nfs4_schedule_lease_recovery(clp);
7312 }
7313 return 0;
7314}
7315
7316static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7317{
7318 struct nfs4_sequence_data *calldata = data;
7319 struct nfs_client *clp = calldata->clp;
7320
7321 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7322 return;
7323
7324 trace_nfs4_sequence(clp, task->tk_status);
7325 if (task->tk_status < 0) {
7326 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7327 if (atomic_read(&clp->cl_count) == 1)
7328 goto out;
7329
7330 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7331 rpc_restart_call_prepare(task);
7332 return;
7333 }
7334 }
7335 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7336out:
7337 dprintk("<-- %s\n", __func__);
7338}
7339
7340static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7341{
7342 struct nfs4_sequence_data *calldata = data;
7343 struct nfs_client *clp = calldata->clp;
7344 struct nfs4_sequence_args *args;
7345 struct nfs4_sequence_res *res;
7346
7347 args = task->tk_msg.rpc_argp;
7348 res = task->tk_msg.rpc_resp;
7349
7350 nfs41_setup_sequence(clp->cl_session, args, res, task);
7351}
7352
7353static const struct rpc_call_ops nfs41_sequence_ops = {
7354 .rpc_call_done = nfs41_sequence_call_done,
7355 .rpc_call_prepare = nfs41_sequence_prepare,
7356 .rpc_release = nfs41_sequence_release,
7357};
7358
7359static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7360 struct rpc_cred *cred,
7361 bool is_privileged)
7362{
7363 struct nfs4_sequence_data *calldata;
7364 struct rpc_message msg = {
7365 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7366 .rpc_cred = cred,
7367 };
7368 struct rpc_task_setup task_setup_data = {
7369 .rpc_client = clp->cl_rpcclient,
7370 .rpc_message = &msg,
7371 .callback_ops = &nfs41_sequence_ops,
7372 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7373 };
7374
7375 if (!atomic_inc_not_zero(&clp->cl_count))
7376 return ERR_PTR(-EIO);
7377 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7378 if (calldata == NULL) {
7379 nfs_put_client(clp);
7380 return ERR_PTR(-ENOMEM);
7381 }
7382 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7383 if (is_privileged)
7384 nfs4_set_sequence_privileged(&calldata->args);
7385 msg.rpc_argp = &calldata->args;
7386 msg.rpc_resp = &calldata->res;
7387 calldata->clp = clp;
7388 task_setup_data.callback_data = calldata;
7389
7390 return rpc_run_task(&task_setup_data);
7391}
7392
7393static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7394{
7395 struct rpc_task *task;
7396 int ret = 0;
7397
7398 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7399 return -EAGAIN;
7400 task = _nfs41_proc_sequence(clp, cred, false);
7401 if (IS_ERR(task))
7402 ret = PTR_ERR(task);
7403 else
7404 rpc_put_task_async(task);
7405 dprintk("<-- %s status=%d\n", __func__, ret);
7406 return ret;
7407}
7408
7409static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7410{
7411 struct rpc_task *task;
7412 int ret;
7413
7414 task = _nfs41_proc_sequence(clp, cred, true);
7415 if (IS_ERR(task)) {
7416 ret = PTR_ERR(task);
7417 goto out;
7418 }
7419 ret = rpc_wait_for_completion_task(task);
7420 if (!ret) {
7421 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7422
7423 if (task->tk_status == 0)
7424 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7425 ret = task->tk_status;
7426 }
7427 rpc_put_task(task);
7428out:
7429 dprintk("<-- %s status=%d\n", __func__, ret);
7430 return ret;
7431}
7432
7433struct nfs4_reclaim_complete_data {
7434 struct nfs_client *clp;
7435 struct nfs41_reclaim_complete_args arg;
7436 struct nfs41_reclaim_complete_res res;
7437};
7438
7439static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7440{
7441 struct nfs4_reclaim_complete_data *calldata = data;
7442
7443 nfs41_setup_sequence(calldata->clp->cl_session,
7444 &calldata->arg.seq_args,
7445 &calldata->res.seq_res,
7446 task);
7447}
7448
7449static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7450{
7451 switch(task->tk_status) {
7452 case 0:
7453 case -NFS4ERR_COMPLETE_ALREADY:
7454 case -NFS4ERR_WRONG_CRED: /* What to do here? */
7455 break;
7456 case -NFS4ERR_DELAY:
7457 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7458 /* fall through */
7459 case -NFS4ERR_RETRY_UNCACHED_REP:
7460 return -EAGAIN;
7461 default:
7462 nfs4_schedule_lease_recovery(clp);
7463 }
7464 return 0;
7465}
7466
7467static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7468{
7469 struct nfs4_reclaim_complete_data *calldata = data;
7470 struct nfs_client *clp = calldata->clp;
7471 struct nfs4_sequence_res *res = &calldata->res.seq_res;
7472
7473 dprintk("--> %s\n", __func__);
7474 if (!nfs41_sequence_done(task, res))
7475 return;
7476
7477 trace_nfs4_reclaim_complete(clp, task->tk_status);
7478 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7479 rpc_restart_call_prepare(task);
7480 return;
7481 }
7482 dprintk("<-- %s\n", __func__);
7483}
7484
7485static void nfs4_free_reclaim_complete_data(void *data)
7486{
7487 struct nfs4_reclaim_complete_data *calldata = data;
7488
7489 kfree(calldata);
7490}
7491
7492static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7493 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7494 .rpc_call_done = nfs4_reclaim_complete_done,
7495 .rpc_release = nfs4_free_reclaim_complete_data,
7496};
7497
7498/*
7499 * Issue a global reclaim complete.
7500 */
7501static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7502 struct rpc_cred *cred)
7503{
7504 struct nfs4_reclaim_complete_data *calldata;
7505 struct rpc_task *task;
7506 struct rpc_message msg = {
7507 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7508 .rpc_cred = cred,
7509 };
7510 struct rpc_task_setup task_setup_data = {
7511 .rpc_client = clp->cl_rpcclient,
7512 .rpc_message = &msg,
7513 .callback_ops = &nfs4_reclaim_complete_call_ops,
7514 .flags = RPC_TASK_ASYNC,
7515 };
7516 int status = -ENOMEM;
7517
7518 dprintk("--> %s\n", __func__);
7519 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7520 if (calldata == NULL)
7521 goto out;
7522 calldata->clp = clp;
7523 calldata->arg.one_fs = 0;
7524
7525 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7526 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7527 msg.rpc_argp = &calldata->arg;
7528 msg.rpc_resp = &calldata->res;
7529 task_setup_data.callback_data = calldata;
7530 task = rpc_run_task(&task_setup_data);
7531 if (IS_ERR(task)) {
7532 status = PTR_ERR(task);
7533 goto out;
7534 }
7535 status = nfs4_wait_for_completion_rpc_task(task);
7536 if (status == 0)
7537 status = task->tk_status;
7538 rpc_put_task(task);
7539 return 0;
7540out:
7541 dprintk("<-- %s status=%d\n", __func__, status);
7542 return status;
7543}
7544
7545static void
7546nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7547{
7548 struct nfs4_layoutget *lgp = calldata;
7549 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7550 struct nfs4_session *session = nfs4_get_session(server);
7551
7552 dprintk("--> %s\n", __func__);
7553 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7554 * right now covering the LAYOUTGET we are about to send.
7555 * However, that is not so catastrophic, and there seems
7556 * to be no way to prevent it completely.
7557 */
7558 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7559 &lgp->res.seq_res, task))
7560 return;
7561 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7562 NFS_I(lgp->args.inode)->layout,
7563 &lgp->args.range,
7564 lgp->args.ctx->state)) {
7565 rpc_exit(task, NFS4_OK);
7566 }
7567}
7568
7569static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7570{
7571 struct nfs4_layoutget *lgp = calldata;
7572 struct inode *inode = lgp->args.inode;
7573 struct nfs_server *server = NFS_SERVER(inode);
7574 struct pnfs_layout_hdr *lo;
7575 struct nfs4_state *state = NULL;
7576 unsigned long timeo, now, giveup;
7577
7578 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7579
7580 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7581 goto out;
7582
7583 switch (task->tk_status) {
7584 case 0:
7585 goto out;
7586 /*
7587 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7588 * (or clients) writing to the same RAID stripe
7589 */
7590 case -NFS4ERR_LAYOUTTRYLATER:
7591 /*
7592 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7593 * existing layout before getting a new one).
7594 */
7595 case -NFS4ERR_RECALLCONFLICT:
7596 timeo = rpc_get_timeout(task->tk_client);
7597 giveup = lgp->args.timestamp + timeo;
7598 now = jiffies;
7599 if (time_after(giveup, now)) {
7600 unsigned long delay;
7601
7602 /* Delay for:
7603 * - Not less then NFS4_POLL_RETRY_MIN.
7604 * - One last time a jiffie before we give up
7605 * - exponential backoff (time_now minus start_attempt)
7606 */
7607 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7608 min((giveup - now - 1),
7609 now - lgp->args.timestamp));
7610
7611 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7612 __func__, delay);
7613 rpc_delay(task, delay);
7614 task->tk_status = 0;
7615 rpc_restart_call_prepare(task);
7616 goto out; /* Do not call nfs4_async_handle_error() */
7617 }
7618 break;
7619 case -NFS4ERR_EXPIRED:
7620 case -NFS4ERR_BAD_STATEID:
7621 spin_lock(&inode->i_lock);
7622 lo = NFS_I(inode)->layout;
7623 if (!lo || list_empty(&lo->plh_segs)) {
7624 spin_unlock(&inode->i_lock);
7625 /* If the open stateid was bad, then recover it. */
7626 state = lgp->args.ctx->state;
7627 } else {
7628 LIST_HEAD(head);
7629
7630 /*
7631 * Mark the bad layout state as invalid, then retry
7632 * with the current stateid.
7633 */
7634 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7635 spin_unlock(&inode->i_lock);
7636 pnfs_free_lseg_list(&head);
7637
7638 task->tk_status = 0;
7639 rpc_restart_call_prepare(task);
7640 }
7641 }
7642 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7643 rpc_restart_call_prepare(task);
7644out:
7645 dprintk("<-- %s\n", __func__);
7646}
7647
7648static size_t max_response_pages(struct nfs_server *server)
7649{
7650 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7651 return nfs_page_array_len(0, max_resp_sz);
7652}
7653
7654static void nfs4_free_pages(struct page **pages, size_t size)
7655{
7656 int i;
7657
7658 if (!pages)
7659 return;
7660
7661 for (i = 0; i < size; i++) {
7662 if (!pages[i])
7663 break;
7664 __free_page(pages[i]);
7665 }
7666 kfree(pages);
7667}
7668
7669static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7670{
7671 struct page **pages;
7672 int i;
7673
7674 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7675 if (!pages) {
7676 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7677 return NULL;
7678 }
7679
7680 for (i = 0; i < size; i++) {
7681 pages[i] = alloc_page(gfp_flags);
7682 if (!pages[i]) {
7683 dprintk("%s: failed to allocate page\n", __func__);
7684 nfs4_free_pages(pages, size);
7685 return NULL;
7686 }
7687 }
7688
7689 return pages;
7690}
7691
7692static void nfs4_layoutget_release(void *calldata)
7693{
7694 struct nfs4_layoutget *lgp = calldata;
7695 struct inode *inode = lgp->args.inode;
7696 struct nfs_server *server = NFS_SERVER(inode);
7697 size_t max_pages = max_response_pages(server);
7698
7699 dprintk("--> %s\n", __func__);
7700 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7701 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7702 put_nfs_open_context(lgp->args.ctx);
7703 kfree(calldata);
7704 dprintk("<-- %s\n", __func__);
7705}
7706
7707static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7708 .rpc_call_prepare = nfs4_layoutget_prepare,
7709 .rpc_call_done = nfs4_layoutget_done,
7710 .rpc_release = nfs4_layoutget_release,
7711};
7712
7713struct pnfs_layout_segment *
7714nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7715{
7716 struct inode *inode = lgp->args.inode;
7717 struct nfs_server *server = NFS_SERVER(inode);
7718 size_t max_pages = max_response_pages(server);
7719 struct rpc_task *task;
7720 struct rpc_message msg = {
7721 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7722 .rpc_argp = &lgp->args,
7723 .rpc_resp = &lgp->res,
7724 .rpc_cred = lgp->cred,
7725 };
7726 struct rpc_task_setup task_setup_data = {
7727 .rpc_client = server->client,
7728 .rpc_message = &msg,
7729 .callback_ops = &nfs4_layoutget_call_ops,
7730 .callback_data = lgp,
7731 .flags = RPC_TASK_ASYNC,
7732 };
7733 struct pnfs_layout_segment *lseg = NULL;
7734 int status = 0;
7735
7736 dprintk("--> %s\n", __func__);
7737
7738 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7739 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7740
7741 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7742 if (!lgp->args.layout.pages) {
7743 nfs4_layoutget_release(lgp);
7744 return ERR_PTR(-ENOMEM);
7745 }
7746 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7747 lgp->args.timestamp = jiffies;
7748
7749 lgp->res.layoutp = &lgp->args.layout;
7750 lgp->res.seq_res.sr_slot = NULL;
7751 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7752
7753 task = rpc_run_task(&task_setup_data);
7754 if (IS_ERR(task))
7755 return ERR_CAST(task);
7756 status = nfs4_wait_for_completion_rpc_task(task);
7757 if (status == 0)
7758 status = task->tk_status;
7759 trace_nfs4_layoutget(lgp->args.ctx,
7760 &lgp->args.range,
7761 &lgp->res.range,
7762 status);
7763 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7764 if (status == 0 && lgp->res.layoutp->len)
7765 lseg = pnfs_layout_process(lgp);
7766 rpc_put_task(task);
7767 dprintk("<-- %s status=%d\n", __func__, status);
7768 if (status)
7769 return ERR_PTR(status);
7770 return lseg;
7771}
7772
7773static void
7774nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7775{
7776 struct nfs4_layoutreturn *lrp = calldata;
7777
7778 dprintk("--> %s\n", __func__);
7779 nfs41_setup_sequence(lrp->clp->cl_session,
7780 &lrp->args.seq_args,
7781 &lrp->res.seq_res,
7782 task);
7783}
7784
7785static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7786{
7787 struct nfs4_layoutreturn *lrp = calldata;
7788 struct nfs_server *server;
7789
7790 dprintk("--> %s\n", __func__);
7791
7792 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7793 return;
7794
7795 server = NFS_SERVER(lrp->args.inode);
7796 switch (task->tk_status) {
7797 default:
7798 task->tk_status = 0;
7799 case 0:
7800 break;
7801 case -NFS4ERR_DELAY:
7802 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7803 break;
7804 rpc_restart_call_prepare(task);
7805 return;
7806 }
7807 dprintk("<-- %s\n", __func__);
7808}
7809
7810static void nfs4_layoutreturn_release(void *calldata)
7811{
7812 struct nfs4_layoutreturn *lrp = calldata;
7813 struct pnfs_layout_hdr *lo = lrp->args.layout;
7814
7815 dprintk("--> %s\n", __func__);
7816 spin_lock(&lo->plh_inode->i_lock);
7817 if (lrp->res.lrs_present)
7818 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7819 pnfs_clear_layoutreturn_waitbit(lo);
7820 clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
7821 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
7822 lo->plh_block_lgets--;
7823 spin_unlock(&lo->plh_inode->i_lock);
7824 pnfs_put_layout_hdr(lrp->args.layout);
7825 kfree(calldata);
7826 dprintk("<-- %s\n", __func__);
7827}
7828
7829static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7830 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7831 .rpc_call_done = nfs4_layoutreturn_done,
7832 .rpc_release = nfs4_layoutreturn_release,
7833};
7834
7835int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
7836{
7837 struct rpc_task *task;
7838 struct rpc_message msg = {
7839 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7840 .rpc_argp = &lrp->args,
7841 .rpc_resp = &lrp->res,
7842 .rpc_cred = lrp->cred,
7843 };
7844 struct rpc_task_setup task_setup_data = {
7845 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7846 .rpc_message = &msg,
7847 .callback_ops = &nfs4_layoutreturn_call_ops,
7848 .callback_data = lrp,
7849 .flags = RPC_TASK_ASYNC,
7850 };
7851 int status = 0;
7852
7853 dprintk("--> %s\n", __func__);
7854 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7855 task = rpc_run_task(&task_setup_data);
7856 if (IS_ERR(task))
7857 return PTR_ERR(task);
7858 if (sync == false)
7859 goto out;
7860 status = nfs4_wait_for_completion_rpc_task(task);
7861 if (status != 0)
7862 goto out;
7863 status = task->tk_status;
7864 trace_nfs4_layoutreturn(lrp->args.inode, status);
7865out:
7866 dprintk("<-- %s status=%d\n", __func__, status);
7867 rpc_put_task(task);
7868 return status;
7869}
7870
7871static int
7872_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7873 struct pnfs_device *pdev,
7874 struct rpc_cred *cred)
7875{
7876 struct nfs4_getdeviceinfo_args args = {
7877 .pdev = pdev,
7878 };
7879 struct nfs4_getdeviceinfo_res res = {
7880 .pdev = pdev,
7881 };
7882 struct rpc_message msg = {
7883 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7884 .rpc_argp = &args,
7885 .rpc_resp = &res,
7886 .rpc_cred = cred,
7887 };
7888 int status;
7889
7890 dprintk("--> %s\n", __func__);
7891 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7892 dprintk("<-- %s status=%d\n", __func__, status);
7893
7894 return status;
7895}
7896
7897int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7898 struct pnfs_device *pdev,
7899 struct rpc_cred *cred)
7900{
7901 struct nfs4_exception exception = { };
7902 int err;
7903
7904 do {
7905 err = nfs4_handle_exception(server,
7906 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7907 &exception);
7908 } while (exception.retry);
7909 return err;
7910}
7911EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7912
7913static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7914{
7915 struct nfs4_layoutcommit_data *data = calldata;
7916 struct nfs_server *server = NFS_SERVER(data->args.inode);
7917 struct nfs4_session *session = nfs4_get_session(server);
7918
7919 nfs41_setup_sequence(session,
7920 &data->args.seq_args,
7921 &data->res.seq_res,
7922 task);
7923}
7924
7925static void
7926nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7927{
7928 struct nfs4_layoutcommit_data *data = calldata;
7929 struct nfs_server *server = NFS_SERVER(data->args.inode);
7930
7931 if (!nfs41_sequence_done(task, &data->res.seq_res))
7932 return;
7933
7934 switch (task->tk_status) { /* Just ignore these failures */
7935 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7936 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7937 case -NFS4ERR_BADLAYOUT: /* no layout */
7938 case -NFS4ERR_GRACE: /* loca_recalim always false */
7939 task->tk_status = 0;
7940 case 0:
7941 break;
7942 default:
7943 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7944 rpc_restart_call_prepare(task);
7945 return;
7946 }
7947 }
7948}
7949
7950static void nfs4_layoutcommit_release(void *calldata)
7951{
7952 struct nfs4_layoutcommit_data *data = calldata;
7953
7954 pnfs_cleanup_layoutcommit(data);
7955 nfs_post_op_update_inode_force_wcc(data->args.inode,
7956 data->res.fattr);
7957 put_rpccred(data->cred);
7958 kfree(data);
7959}
7960
7961static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7962 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7963 .rpc_call_done = nfs4_layoutcommit_done,
7964 .rpc_release = nfs4_layoutcommit_release,
7965};
7966
7967int
7968nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7969{
7970 struct rpc_message msg = {
7971 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7972 .rpc_argp = &data->args,
7973 .rpc_resp = &data->res,
7974 .rpc_cred = data->cred,
7975 };
7976 struct rpc_task_setup task_setup_data = {
7977 .task = &data->task,
7978 .rpc_client = NFS_CLIENT(data->args.inode),
7979 .rpc_message = &msg,
7980 .callback_ops = &nfs4_layoutcommit_ops,
7981 .callback_data = data,
7982 .flags = RPC_TASK_ASYNC,
7983 };
7984 struct rpc_task *task;
7985 int status = 0;
7986
7987 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7988 "lbw: %llu inode %lu\n",
7989 data->task.tk_pid, sync,
7990 data->args.lastbytewritten,
7991 data->args.inode->i_ino);
7992
7993 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7994 task = rpc_run_task(&task_setup_data);
7995 if (IS_ERR(task))
7996 return PTR_ERR(task);
7997 if (sync == false)
7998 goto out;
7999 status = nfs4_wait_for_completion_rpc_task(task);
8000 if (status != 0)
8001 goto out;
8002 status = task->tk_status;
8003 trace_nfs4_layoutcommit(data->args.inode, status);
8004out:
8005 dprintk("%s: status %d\n", __func__, status);
8006 rpc_put_task(task);
8007 return status;
8008}
8009
8010/**
8011 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8012 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8013 */
8014static int
8015_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8016 struct nfs_fsinfo *info,
8017 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8018{
8019 struct nfs41_secinfo_no_name_args args = {
8020 .style = SECINFO_STYLE_CURRENT_FH,
8021 };
8022 struct nfs4_secinfo_res res = {
8023 .flavors = flavors,
8024 };
8025 struct rpc_message msg = {
8026 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8027 .rpc_argp = &args,
8028 .rpc_resp = &res,
8029 };
8030 struct rpc_clnt *clnt = server->client;
8031 struct rpc_cred *cred = NULL;
8032 int status;
8033
8034 if (use_integrity) {
8035 clnt = server->nfs_client->cl_rpcclient;
8036 cred = nfs4_get_clid_cred(server->nfs_client);
8037 msg.rpc_cred = cred;
8038 }
8039
8040 dprintk("--> %s\n", __func__);
8041 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8042 &res.seq_res, 0);
8043 dprintk("<-- %s status=%d\n", __func__, status);
8044
8045 if (cred)
8046 put_rpccred(cred);
8047
8048 return status;
8049}
8050
8051static int
8052nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8053 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8054{
8055 struct nfs4_exception exception = { };
8056 int err;
8057 do {
8058 /* first try using integrity protection */
8059 err = -NFS4ERR_WRONGSEC;
8060
8061 /* try to use integrity protection with machine cred */
8062 if (_nfs4_is_integrity_protected(server->nfs_client))
8063 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8064 flavors, true);
8065
8066 /*
8067 * if unable to use integrity protection, or SECINFO with
8068 * integrity protection returns NFS4ERR_WRONGSEC (which is
8069 * disallowed by spec, but exists in deployed servers) use
8070 * the current filesystem's rpc_client and the user cred.
8071 */
8072 if (err == -NFS4ERR_WRONGSEC)
8073 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8074 flavors, false);
8075
8076 switch (err) {
8077 case 0:
8078 case -NFS4ERR_WRONGSEC:
8079 case -ENOTSUPP:
8080 goto out;
8081 default:
8082 err = nfs4_handle_exception(server, err, &exception);
8083 }
8084 } while (exception.retry);
8085out:
8086 return err;
8087}
8088
8089static int
8090nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8091 struct nfs_fsinfo *info)
8092{
8093 int err;
8094 struct page *page;
8095 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8096 struct nfs4_secinfo_flavors *flavors;
8097 struct nfs4_secinfo4 *secinfo;
8098 int i;
8099
8100 page = alloc_page(GFP_KERNEL);
8101 if (!page) {
8102 err = -ENOMEM;
8103 goto out;
8104 }
8105
8106 flavors = page_address(page);
8107 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8108
8109 /*
8110 * Fall back on "guess and check" method if
8111 * the server doesn't support SECINFO_NO_NAME
8112 */
8113 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8114 err = nfs4_find_root_sec(server, fhandle, info);
8115 goto out_freepage;
8116 }
8117 if (err)
8118 goto out_freepage;
8119
8120 for (i = 0; i < flavors->num_flavors; i++) {
8121 secinfo = &flavors->flavors[i];
8122
8123 switch (secinfo->flavor) {
8124 case RPC_AUTH_NULL:
8125 case RPC_AUTH_UNIX:
8126 case RPC_AUTH_GSS:
8127 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8128 &secinfo->flavor_info);
8129 break;
8130 default:
8131 flavor = RPC_AUTH_MAXFLAVOR;
8132 break;
8133 }
8134
8135 if (!nfs_auth_info_match(&server->auth_info, flavor))
8136 flavor = RPC_AUTH_MAXFLAVOR;
8137
8138 if (flavor != RPC_AUTH_MAXFLAVOR) {
8139 err = nfs4_lookup_root_sec(server, fhandle,
8140 info, flavor);
8141 if (!err)
8142 break;
8143 }
8144 }
8145
8146 if (flavor == RPC_AUTH_MAXFLAVOR)
8147 err = -EPERM;
8148
8149out_freepage:
8150 put_page(page);
8151 if (err == -EACCES)
8152 return -EPERM;
8153out:
8154 return err;
8155}
8156
8157static int _nfs41_test_stateid(struct nfs_server *server,
8158 nfs4_stateid *stateid,
8159 struct rpc_cred *cred)
8160{
8161 int status;
8162 struct nfs41_test_stateid_args args = {
8163 .stateid = stateid,
8164 };
8165 struct nfs41_test_stateid_res res;
8166 struct rpc_message msg = {
8167 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8168 .rpc_argp = &args,
8169 .rpc_resp = &res,
8170 .rpc_cred = cred,
8171 };
8172 struct rpc_clnt *rpc_client = server->client;
8173
8174 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8175 &rpc_client, &msg);
8176
8177 dprintk("NFS call test_stateid %p\n", stateid);
8178 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8179 nfs4_set_sequence_privileged(&args.seq_args);
8180 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8181 &args.seq_args, &res.seq_res);
8182 if (status != NFS_OK) {
8183 dprintk("NFS reply test_stateid: failed, %d\n", status);
8184 return status;
8185 }
8186 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8187 return -res.status;
8188}
8189
8190/**
8191 * nfs41_test_stateid - perform a TEST_STATEID operation
8192 *
8193 * @server: server / transport on which to perform the operation
8194 * @stateid: state ID to test
8195 * @cred: credential
8196 *
8197 * Returns NFS_OK if the server recognizes that "stateid" is valid.
8198 * Otherwise a negative NFS4ERR value is returned if the operation
8199 * failed or the state ID is not currently valid.
8200 */
8201static int nfs41_test_stateid(struct nfs_server *server,
8202 nfs4_stateid *stateid,
8203 struct rpc_cred *cred)
8204{
8205 struct nfs4_exception exception = { };
8206 int err;
8207 do {
8208 err = _nfs41_test_stateid(server, stateid, cred);
8209 if (err != -NFS4ERR_DELAY)
8210 break;
8211 nfs4_handle_exception(server, err, &exception);
8212 } while (exception.retry);
8213 return err;
8214}
8215
8216struct nfs_free_stateid_data {
8217 struct nfs_server *server;
8218 struct nfs41_free_stateid_args args;
8219 struct nfs41_free_stateid_res res;
8220};
8221
8222static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8223{
8224 struct nfs_free_stateid_data *data = calldata;
8225 nfs41_setup_sequence(nfs4_get_session(data->server),
8226 &data->args.seq_args,
8227 &data->res.seq_res,
8228 task);
8229}
8230
8231static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8232{
8233 struct nfs_free_stateid_data *data = calldata;
8234
8235 nfs41_sequence_done(task, &data->res.seq_res);
8236
8237 switch (task->tk_status) {
8238 case -NFS4ERR_DELAY:
8239 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8240 rpc_restart_call_prepare(task);
8241 }
8242}
8243
8244static void nfs41_free_stateid_release(void *calldata)
8245{
8246 kfree(calldata);
8247}
8248
8249static const struct rpc_call_ops nfs41_free_stateid_ops = {
8250 .rpc_call_prepare = nfs41_free_stateid_prepare,
8251 .rpc_call_done = nfs41_free_stateid_done,
8252 .rpc_release = nfs41_free_stateid_release,
8253};
8254
8255static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8256 nfs4_stateid *stateid,
8257 struct rpc_cred *cred,
8258 bool privileged)
8259{
8260 struct rpc_message msg = {
8261 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8262 .rpc_cred = cred,
8263 };
8264 struct rpc_task_setup task_setup = {
8265 .rpc_client = server->client,
8266 .rpc_message = &msg,
8267 .callback_ops = &nfs41_free_stateid_ops,
8268 .flags = RPC_TASK_ASYNC,
8269 };
8270 struct nfs_free_stateid_data *data;
8271
8272 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8273 &task_setup.rpc_client, &msg);
8274
8275 dprintk("NFS call free_stateid %p\n", stateid);
8276 data = kmalloc(sizeof(*data), GFP_NOFS);
8277 if (!data)
8278 return ERR_PTR(-ENOMEM);
8279 data->server = server;
8280 nfs4_stateid_copy(&data->args.stateid, stateid);
8281
8282 task_setup.callback_data = data;
8283
8284 msg.rpc_argp = &data->args;
8285 msg.rpc_resp = &data->res;
8286 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8287 if (privileged)
8288 nfs4_set_sequence_privileged(&data->args.seq_args);
8289
8290 return rpc_run_task(&task_setup);
8291}
8292
8293/**
8294 * nfs41_free_stateid - perform a FREE_STATEID operation
8295 *
8296 * @server: server / transport on which to perform the operation
8297 * @stateid: state ID to release
8298 * @cred: credential
8299 *
8300 * Returns NFS_OK if the server freed "stateid". Otherwise a
8301 * negative NFS4ERR value is returned.
8302 */
8303static int nfs41_free_stateid(struct nfs_server *server,
8304 nfs4_stateid *stateid,
8305 struct rpc_cred *cred)
8306{
8307 struct rpc_task *task;
8308 int ret;
8309
8310 task = _nfs41_free_stateid(server, stateid, cred, true);
8311 if (IS_ERR(task))
8312 return PTR_ERR(task);
8313 ret = rpc_wait_for_completion_task(task);
8314 if (!ret)
8315 ret = task->tk_status;
8316 rpc_put_task(task);
8317 return ret;
8318}
8319
8320static void
8321nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8322{
8323 struct rpc_task *task;
8324 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8325
8326 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8327 nfs4_free_lock_state(server, lsp);
8328 if (IS_ERR(task))
8329 return;
8330 rpc_put_task(task);
8331}
8332
8333static bool nfs41_match_stateid(const nfs4_stateid *s1,
8334 const nfs4_stateid *s2)
8335{
8336 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8337 return false;
8338
8339 if (s1->seqid == s2->seqid)
8340 return true;
8341 if (s1->seqid == 0 || s2->seqid == 0)
8342 return true;
8343
8344 return false;
8345}
8346
8347#endif /* CONFIG_NFS_V4_1 */
8348
8349static bool nfs4_match_stateid(const nfs4_stateid *s1,
8350 const nfs4_stateid *s2)
8351{
8352 return nfs4_stateid_match(s1, s2);
8353}
8354
8355
8356static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8357 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8358 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8359 .recover_open = nfs4_open_reclaim,
8360 .recover_lock = nfs4_lock_reclaim,
8361 .establish_clid = nfs4_init_clientid,
8362 .detect_trunking = nfs40_discover_server_trunking,
8363};
8364
8365#if defined(CONFIG_NFS_V4_1)
8366static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8367 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8368 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8369 .recover_open = nfs4_open_reclaim,
8370 .recover_lock = nfs4_lock_reclaim,
8371 .establish_clid = nfs41_init_clientid,
8372 .reclaim_complete = nfs41_proc_reclaim_complete,
8373 .detect_trunking = nfs41_discover_server_trunking,
8374};
8375#endif /* CONFIG_NFS_V4_1 */
8376
8377static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8378 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8379 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8380 .recover_open = nfs40_open_expired,
8381 .recover_lock = nfs4_lock_expired,
8382 .establish_clid = nfs4_init_clientid,
8383};
8384
8385#if defined(CONFIG_NFS_V4_1)
8386static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8387 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8388 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8389 .recover_open = nfs41_open_expired,
8390 .recover_lock = nfs41_lock_expired,
8391 .establish_clid = nfs41_init_clientid,
8392};
8393#endif /* CONFIG_NFS_V4_1 */
8394
8395static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8396 .sched_state_renewal = nfs4_proc_async_renew,
8397 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8398 .renew_lease = nfs4_proc_renew,
8399};
8400
8401#if defined(CONFIG_NFS_V4_1)
8402static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8403 .sched_state_renewal = nfs41_proc_async_sequence,
8404 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8405 .renew_lease = nfs4_proc_sequence,
8406};
8407#endif
8408
8409static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8410 .get_locations = _nfs40_proc_get_locations,
8411 .fsid_present = _nfs40_proc_fsid_present,
8412};
8413
8414#if defined(CONFIG_NFS_V4_1)
8415static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8416 .get_locations = _nfs41_proc_get_locations,
8417 .fsid_present = _nfs41_proc_fsid_present,
8418};
8419#endif /* CONFIG_NFS_V4_1 */
8420
8421static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8422 .minor_version = 0,
8423 .init_caps = NFS_CAP_READDIRPLUS
8424 | NFS_CAP_ATOMIC_OPEN
8425 | NFS_CAP_CHANGE_ATTR
8426 | NFS_CAP_POSIX_LOCK,
8427 .init_client = nfs40_init_client,
8428 .shutdown_client = nfs40_shutdown_client,
8429 .match_stateid = nfs4_match_stateid,
8430 .find_root_sec = nfs4_find_root_sec,
8431 .free_lock_state = nfs4_release_lockowner,
8432 .alloc_seqid = nfs_alloc_seqid,
8433 .call_sync_ops = &nfs40_call_sync_ops,
8434 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8435 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8436 .state_renewal_ops = &nfs40_state_renewal_ops,
8437 .mig_recovery_ops = &nfs40_mig_recovery_ops,
8438};
8439
8440#if defined(CONFIG_NFS_V4_1)
8441static struct nfs_seqid *
8442nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8443{
8444 return NULL;
8445}
8446
8447static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8448 .minor_version = 1,
8449 .init_caps = NFS_CAP_READDIRPLUS
8450 | NFS_CAP_ATOMIC_OPEN
8451 | NFS_CAP_CHANGE_ATTR
8452 | NFS_CAP_POSIX_LOCK
8453 | NFS_CAP_STATEID_NFSV41
8454 | NFS_CAP_ATOMIC_OPEN_V1,
8455 .init_client = nfs41_init_client,
8456 .shutdown_client = nfs41_shutdown_client,
8457 .match_stateid = nfs41_match_stateid,
8458 .find_root_sec = nfs41_find_root_sec,
8459 .free_lock_state = nfs41_free_lock_state,
8460 .alloc_seqid = nfs_alloc_no_seqid,
8461 .call_sync_ops = &nfs41_call_sync_ops,
8462 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8463 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8464 .state_renewal_ops = &nfs41_state_renewal_ops,
8465 .mig_recovery_ops = &nfs41_mig_recovery_ops,
8466};
8467#endif
8468
8469#if defined(CONFIG_NFS_V4_2)
8470static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8471 .minor_version = 2,
8472 .init_caps = NFS_CAP_READDIRPLUS
8473 | NFS_CAP_ATOMIC_OPEN
8474 | NFS_CAP_CHANGE_ATTR
8475 | NFS_CAP_POSIX_LOCK
8476 | NFS_CAP_STATEID_NFSV41
8477 | NFS_CAP_ATOMIC_OPEN_V1
8478 | NFS_CAP_ALLOCATE
8479 | NFS_CAP_DEALLOCATE
8480 | NFS_CAP_SEEK,
8481 .init_client = nfs41_init_client,
8482 .shutdown_client = nfs41_shutdown_client,
8483 .match_stateid = nfs41_match_stateid,
8484 .find_root_sec = nfs41_find_root_sec,
8485 .free_lock_state = nfs41_free_lock_state,
8486 .call_sync_ops = &nfs41_call_sync_ops,
8487 .alloc_seqid = nfs_alloc_no_seqid,
8488 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8489 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8490 .state_renewal_ops = &nfs41_state_renewal_ops,
8491};
8492#endif
8493
8494const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8495 [0] = &nfs_v4_0_minor_ops,
8496#if defined(CONFIG_NFS_V4_1)
8497 [1] = &nfs_v4_1_minor_ops,
8498#endif
8499#if defined(CONFIG_NFS_V4_2)
8500 [2] = &nfs_v4_2_minor_ops,
8501#endif
8502};
8503
8504static const struct inode_operations nfs4_dir_inode_operations = {
8505 .create = nfs_create,
8506 .lookup = nfs_lookup,
8507 .atomic_open = nfs_atomic_open,
8508 .link = nfs_link,
8509 .unlink = nfs_unlink,
8510 .symlink = nfs_symlink,
8511 .mkdir = nfs_mkdir,
8512 .rmdir = nfs_rmdir,
8513 .mknod = nfs_mknod,
8514 .rename = nfs_rename,
8515 .permission = nfs_permission,
8516 .getattr = nfs_getattr,
8517 .setattr = nfs_setattr,
8518 .getxattr = generic_getxattr,
8519 .setxattr = generic_setxattr,
8520 .listxattr = generic_listxattr,
8521 .removexattr = generic_removexattr,
8522};
8523
8524static const struct inode_operations nfs4_file_inode_operations = {
8525 .permission = nfs_permission,
8526 .getattr = nfs_getattr,
8527 .setattr = nfs_setattr,
8528 .getxattr = generic_getxattr,
8529 .setxattr = generic_setxattr,
8530 .listxattr = generic_listxattr,
8531 .removexattr = generic_removexattr,
8532};
8533
8534const struct nfs_rpc_ops nfs_v4_clientops = {
8535 .version = 4, /* protocol version */
8536 .dentry_ops = &nfs4_dentry_operations,
8537 .dir_inode_ops = &nfs4_dir_inode_operations,
8538 .file_inode_ops = &nfs4_file_inode_operations,
8539 .file_ops = &nfs4_file_operations,
8540 .getroot = nfs4_proc_get_root,
8541 .submount = nfs4_submount,
8542 .try_mount = nfs4_try_mount,
8543 .getattr = nfs4_proc_getattr,
8544 .setattr = nfs4_proc_setattr,
8545 .lookup = nfs4_proc_lookup,
8546 .access = nfs4_proc_access,
8547 .readlink = nfs4_proc_readlink,
8548 .create = nfs4_proc_create,
8549 .remove = nfs4_proc_remove,
8550 .unlink_setup = nfs4_proc_unlink_setup,
8551 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8552 .unlink_done = nfs4_proc_unlink_done,
8553 .rename_setup = nfs4_proc_rename_setup,
8554 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8555 .rename_done = nfs4_proc_rename_done,
8556 .link = nfs4_proc_link,
8557 .symlink = nfs4_proc_symlink,
8558 .mkdir = nfs4_proc_mkdir,
8559 .rmdir = nfs4_proc_remove,
8560 .readdir = nfs4_proc_readdir,
8561 .mknod = nfs4_proc_mknod,
8562 .statfs = nfs4_proc_statfs,
8563 .fsinfo = nfs4_proc_fsinfo,
8564 .pathconf = nfs4_proc_pathconf,
8565 .set_capabilities = nfs4_server_capabilities,
8566 .decode_dirent = nfs4_decode_dirent,
8567 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8568 .read_setup = nfs4_proc_read_setup,
8569 .read_done = nfs4_read_done,
8570 .write_setup = nfs4_proc_write_setup,
8571 .write_done = nfs4_write_done,
8572 .commit_setup = nfs4_proc_commit_setup,
8573 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8574 .commit_done = nfs4_commit_done,
8575 .lock = nfs4_proc_lock,
8576 .clear_acl_cache = nfs4_zap_acl_attr,
8577 .close_context = nfs4_close_context,
8578 .open_context = nfs4_atomic_open,
8579 .have_delegation = nfs4_have_delegation,
8580 .return_delegation = nfs4_inode_return_delegation,
8581 .alloc_client = nfs4_alloc_client,
8582 .init_client = nfs4_init_client,
8583 .free_client = nfs4_free_client,
8584 .create_server = nfs4_create_server,
8585 .clone_server = nfs_clone_server,
8586};
8587
8588static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8589 .prefix = XATTR_NAME_NFSV4_ACL,
8590 .list = nfs4_xattr_list_nfs4_acl,
8591 .get = nfs4_xattr_get_nfs4_acl,
8592 .set = nfs4_xattr_set_nfs4_acl,
8593};
8594
8595const struct xattr_handler *nfs4_xattr_handlers[] = {
8596 &nfs4_xattr_nfs4_acl_handler,
8597#ifdef CONFIG_NFS_V4_SECURITY_LABEL
8598 &nfs4_xattr_nfs4_label_handler,
8599#endif
8600 NULL
8601};
8602
8603/*
8604 * Local variables:
8605 * c-basic-offset: 8
8606 * End:
8607 */
Linux 6.x block layer and io_uring tree(s)