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NFSv4: Initialise the NFSv4.1 slot table highest_used_slotid correctly
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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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/sunrpc/bc_xprt.h>
56#include <linux/xattr.h>
57#include <linux/utsname.h>
58#include <linux/freezer.h>
59
60#include "nfs4_fs.h"
61#include "delegation.h"
62#include "internal.h"
63#include "iostat.h"
64#include "callback.h"
65#include "pnfs.h"
66#include "netns.h"
67
68#define NFSDBG_FACILITY NFSDBG_PROC
69
70#define NFS4_POLL_RETRY_MIN (HZ/10)
71#define NFS4_POLL_RETRY_MAX (15*HZ)
72
73#define NFS4_MAX_LOOP_ON_RECOVER (10)
74
75struct nfs4_opendata;
76static int _nfs4_proc_open(struct nfs4_opendata *data);
77static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
78static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
79static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
80static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
81static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
82static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
83static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
84 struct nfs_fattr *fattr, struct iattr *sattr,
85 struct nfs4_state *state);
86#ifdef CONFIG_NFS_V4_1
87static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
88static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
89#endif
90/* Prevent leaks of NFSv4 errors into userland */
91static int nfs4_map_errors(int err)
92{
93 if (err >= -1000)
94 return err;
95 switch (err) {
96 case -NFS4ERR_RESOURCE:
97 return -EREMOTEIO;
98 case -NFS4ERR_WRONGSEC:
99 return -EPERM;
100 case -NFS4ERR_BADOWNER:
101 case -NFS4ERR_BADNAME:
102 return -EINVAL;
103 case -NFS4ERR_SHARE_DENIED:
104 return -EACCES;
105 case -NFS4ERR_MINOR_VERS_MISMATCH:
106 return -EPROTONOSUPPORT;
107 case -NFS4ERR_ACCESS:
108 return -EACCES;
109 default:
110 dprintk("%s could not handle NFSv4 error %d\n",
111 __func__, -err);
112 break;
113 }
114 return -EIO;
115}
116
117/*
118 * This is our standard bitmap for GETATTR requests.
119 */
120const u32 nfs4_fattr_bitmap[3] = {
121 FATTR4_WORD0_TYPE
122 | FATTR4_WORD0_CHANGE
123 | FATTR4_WORD0_SIZE
124 | FATTR4_WORD0_FSID
125 | FATTR4_WORD0_FILEID,
126 FATTR4_WORD1_MODE
127 | FATTR4_WORD1_NUMLINKS
128 | FATTR4_WORD1_OWNER
129 | FATTR4_WORD1_OWNER_GROUP
130 | FATTR4_WORD1_RAWDEV
131 | FATTR4_WORD1_SPACE_USED
132 | FATTR4_WORD1_TIME_ACCESS
133 | FATTR4_WORD1_TIME_METADATA
134 | FATTR4_WORD1_TIME_MODIFY
135};
136
137static const u32 nfs4_pnfs_open_bitmap[3] = {
138 FATTR4_WORD0_TYPE
139 | FATTR4_WORD0_CHANGE
140 | FATTR4_WORD0_SIZE
141 | FATTR4_WORD0_FSID
142 | FATTR4_WORD0_FILEID,
143 FATTR4_WORD1_MODE
144 | FATTR4_WORD1_NUMLINKS
145 | FATTR4_WORD1_OWNER
146 | FATTR4_WORD1_OWNER_GROUP
147 | FATTR4_WORD1_RAWDEV
148 | FATTR4_WORD1_SPACE_USED
149 | FATTR4_WORD1_TIME_ACCESS
150 | FATTR4_WORD1_TIME_METADATA
151 | FATTR4_WORD1_TIME_MODIFY,
152 FATTR4_WORD2_MDSTHRESHOLD
153};
154
155static const u32 nfs4_open_noattr_bitmap[3] = {
156 FATTR4_WORD0_TYPE
157 | FATTR4_WORD0_CHANGE
158 | FATTR4_WORD0_FILEID,
159};
160
161const u32 nfs4_statfs_bitmap[2] = {
162 FATTR4_WORD0_FILES_AVAIL
163 | FATTR4_WORD0_FILES_FREE
164 | FATTR4_WORD0_FILES_TOTAL,
165 FATTR4_WORD1_SPACE_AVAIL
166 | FATTR4_WORD1_SPACE_FREE
167 | FATTR4_WORD1_SPACE_TOTAL
168};
169
170const u32 nfs4_pathconf_bitmap[2] = {
171 FATTR4_WORD0_MAXLINK
172 | FATTR4_WORD0_MAXNAME,
173 0
174};
175
176const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
177 | FATTR4_WORD0_MAXREAD
178 | FATTR4_WORD0_MAXWRITE
179 | FATTR4_WORD0_LEASE_TIME,
180 FATTR4_WORD1_TIME_DELTA
181 | FATTR4_WORD1_FS_LAYOUT_TYPES,
182 FATTR4_WORD2_LAYOUT_BLKSIZE
183};
184
185const u32 nfs4_fs_locations_bitmap[2] = {
186 FATTR4_WORD0_TYPE
187 | FATTR4_WORD0_CHANGE
188 | FATTR4_WORD0_SIZE
189 | FATTR4_WORD0_FSID
190 | FATTR4_WORD0_FILEID
191 | FATTR4_WORD0_FS_LOCATIONS,
192 FATTR4_WORD1_MODE
193 | FATTR4_WORD1_NUMLINKS
194 | FATTR4_WORD1_OWNER
195 | FATTR4_WORD1_OWNER_GROUP
196 | FATTR4_WORD1_RAWDEV
197 | FATTR4_WORD1_SPACE_USED
198 | FATTR4_WORD1_TIME_ACCESS
199 | FATTR4_WORD1_TIME_METADATA
200 | FATTR4_WORD1_TIME_MODIFY
201 | FATTR4_WORD1_MOUNTED_ON_FILEID
202};
203
204static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
205 struct nfs4_readdir_arg *readdir)
206{
207 __be32 *start, *p;
208
209 BUG_ON(readdir->count < 80);
210 if (cookie > 2) {
211 readdir->cookie = cookie;
212 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
213 return;
214 }
215
216 readdir->cookie = 0;
217 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
218 if (cookie == 2)
219 return;
220
221 /*
222 * NFSv4 servers do not return entries for '.' and '..'
223 * Therefore, we fake these entries here. We let '.'
224 * have cookie 0 and '..' have cookie 1. Note that
225 * when talking to the server, we always send cookie 0
226 * instead of 1 or 2.
227 */
228 start = p = kmap_atomic(*readdir->pages);
229
230 if (cookie == 0) {
231 *p++ = xdr_one; /* next */
232 *p++ = xdr_zero; /* cookie, first word */
233 *p++ = xdr_one; /* cookie, second word */
234 *p++ = xdr_one; /* entry len */
235 memcpy(p, ".\0\0\0", 4); /* entry */
236 p++;
237 *p++ = xdr_one; /* bitmap length */
238 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
239 *p++ = htonl(8); /* attribute buffer length */
240 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
241 }
242
243 *p++ = xdr_one; /* next */
244 *p++ = xdr_zero; /* cookie, first word */
245 *p++ = xdr_two; /* cookie, second word */
246 *p++ = xdr_two; /* entry len */
247 memcpy(p, "..\0\0", 4); /* entry */
248 p++;
249 *p++ = xdr_one; /* bitmap length */
250 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
251 *p++ = htonl(8); /* attribute buffer length */
252 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
253
254 readdir->pgbase = (char *)p - (char *)start;
255 readdir->count -= readdir->pgbase;
256 kunmap_atomic(start);
257}
258
259static int nfs4_wait_clnt_recover(struct nfs_client *clp)
260{
261 int res;
262
263 might_sleep();
264
265 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
266 nfs_wait_bit_killable, TASK_KILLABLE);
267 if (res)
268 return res;
269
270 if (clp->cl_cons_state < 0)
271 return clp->cl_cons_state;
272 return 0;
273}
274
275static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
276{
277 int res = 0;
278
279 might_sleep();
280
281 if (*timeout <= 0)
282 *timeout = NFS4_POLL_RETRY_MIN;
283 if (*timeout > NFS4_POLL_RETRY_MAX)
284 *timeout = NFS4_POLL_RETRY_MAX;
285 freezable_schedule_timeout_killable(*timeout);
286 if (fatal_signal_pending(current))
287 res = -ERESTARTSYS;
288 *timeout <<= 1;
289 return res;
290}
291
292/* This is the error handling routine for processes that are allowed
293 * to sleep.
294 */
295static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
296{
297 struct nfs_client *clp = server->nfs_client;
298 struct nfs4_state *state = exception->state;
299 struct inode *inode = exception->inode;
300 int ret = errorcode;
301
302 exception->retry = 0;
303 switch(errorcode) {
304 case 0:
305 return 0;
306 case -NFS4ERR_OPENMODE:
307 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
308 nfs4_inode_return_delegation(inode);
309 exception->retry = 1;
310 return 0;
311 }
312 if (state == NULL)
313 break;
314 nfs4_schedule_stateid_recovery(server, state);
315 goto wait_on_recovery;
316 case -NFS4ERR_DELEG_REVOKED:
317 case -NFS4ERR_ADMIN_REVOKED:
318 case -NFS4ERR_BAD_STATEID:
319 if (state == NULL)
320 break;
321 nfs_remove_bad_delegation(state->inode);
322 nfs4_schedule_stateid_recovery(server, state);
323 goto wait_on_recovery;
324 case -NFS4ERR_EXPIRED:
325 if (state != NULL)
326 nfs4_schedule_stateid_recovery(server, state);
327 case -NFS4ERR_STALE_STATEID:
328 case -NFS4ERR_STALE_CLIENTID:
329 nfs4_schedule_lease_recovery(clp);
330 goto wait_on_recovery;
331#if defined(CONFIG_NFS_V4_1)
332 case -NFS4ERR_BADSESSION:
333 case -NFS4ERR_BADSLOT:
334 case -NFS4ERR_BAD_HIGH_SLOT:
335 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
336 case -NFS4ERR_DEADSESSION:
337 case -NFS4ERR_SEQ_FALSE_RETRY:
338 case -NFS4ERR_SEQ_MISORDERED:
339 dprintk("%s ERROR: %d Reset session\n", __func__,
340 errorcode);
341 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
342 goto wait_on_recovery;
343#endif /* defined(CONFIG_NFS_V4_1) */
344 case -NFS4ERR_FILE_OPEN:
345 if (exception->timeout > HZ) {
346 /* We have retried a decent amount, time to
347 * fail
348 */
349 ret = -EBUSY;
350 break;
351 }
352 case -NFS4ERR_GRACE:
353 case -NFS4ERR_DELAY:
354 case -EKEYEXPIRED:
355 ret = nfs4_delay(server->client, &exception->timeout);
356 if (ret != 0)
357 break;
358 case -NFS4ERR_RETRY_UNCACHED_REP:
359 case -NFS4ERR_OLD_STATEID:
360 exception->retry = 1;
361 break;
362 case -NFS4ERR_BADOWNER:
363 /* The following works around a Linux server bug! */
364 case -NFS4ERR_BADNAME:
365 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
366 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
367 exception->retry = 1;
368 printk(KERN_WARNING "NFS: v4 server %s "
369 "does not accept raw "
370 "uid/gids. "
371 "Reenabling the idmapper.\n",
372 server->nfs_client->cl_hostname);
373 }
374 }
375 /* We failed to handle the error */
376 return nfs4_map_errors(ret);
377wait_on_recovery:
378 ret = nfs4_wait_clnt_recover(clp);
379 if (ret == 0)
380 exception->retry = 1;
381 return ret;
382}
383
384
385static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
386{
387 spin_lock(&clp->cl_lock);
388 if (time_before(clp->cl_last_renewal,timestamp))
389 clp->cl_last_renewal = timestamp;
390 spin_unlock(&clp->cl_lock);
391}
392
393static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
394{
395 do_renew_lease(server->nfs_client, timestamp);
396}
397
398#if defined(CONFIG_NFS_V4_1)
399
400/*
401 * nfs4_free_slot - free a slot and efficiently update slot table.
402 *
403 * freeing a slot is trivially done by clearing its respective bit
404 * in the bitmap.
405 * If the freed slotid equals highest_used_slotid we want to update it
406 * so that the server would be able to size down the slot table if needed,
407 * otherwise we know that the highest_used_slotid is still in use.
408 * When updating highest_used_slotid there may be "holes" in the bitmap
409 * so we need to scan down from highest_used_slotid to 0 looking for the now
410 * highest slotid in use.
411 * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
412 *
413 * Must be called while holding tbl->slot_tbl_lock
414 */
415static void
416nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
417{
418 BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
419 /* clear used bit in bitmap */
420 __clear_bit(slotid, tbl->used_slots);
421
422 /* update highest_used_slotid when it is freed */
423 if (slotid == tbl->highest_used_slotid) {
424 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
425 if (slotid < tbl->max_slots)
426 tbl->highest_used_slotid = slotid;
427 else
428 tbl->highest_used_slotid = NFS4_NO_SLOT;
429 }
430 dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
431 slotid, tbl->highest_used_slotid);
432}
433
434bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
435{
436 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
437 return true;
438}
439
440/*
441 * Signal state manager thread if session fore channel is drained
442 */
443static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
444{
445 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
446 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
447 nfs4_set_task_privileged, NULL);
448 return;
449 }
450
451 if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
452 return;
453
454 dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
455 complete(&ses->fc_slot_table.complete);
456}
457
458/*
459 * Signal state manager thread if session back channel is drained
460 */
461void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
462{
463 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
464 ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
465 return;
466 dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
467 complete(&ses->bc_slot_table.complete);
468}
469
470static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
471{
472 struct nfs4_slot_table *tbl;
473
474 tbl = &res->sr_session->fc_slot_table;
475 if (!res->sr_slot) {
476 /* just wake up the next guy waiting since
477 * we may have not consumed a slot after all */
478 dprintk("%s: No slot\n", __func__);
479 return;
480 }
481
482 spin_lock(&tbl->slot_tbl_lock);
483 nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
484 nfs4_check_drain_fc_complete(res->sr_session);
485 spin_unlock(&tbl->slot_tbl_lock);
486 res->sr_slot = NULL;
487}
488
489static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
490{
491 unsigned long timestamp;
492 struct nfs_client *clp;
493
494 /*
495 * sr_status remains 1 if an RPC level error occurred. The server
496 * may or may not have processed the sequence operation..
497 * Proceed as if the server received and processed the sequence
498 * operation.
499 */
500 if (res->sr_status == 1)
501 res->sr_status = NFS_OK;
502
503 /* don't increment the sequence number if the task wasn't sent */
504 if (!RPC_WAS_SENT(task))
505 goto out;
506
507 /* Check the SEQUENCE operation status */
508 switch (res->sr_status) {
509 case 0:
510 /* Update the slot's sequence and clientid lease timer */
511 ++res->sr_slot->seq_nr;
512 timestamp = res->sr_renewal_time;
513 clp = res->sr_session->clp;
514 do_renew_lease(clp, timestamp);
515 /* Check sequence flags */
516 if (res->sr_status_flags != 0)
517 nfs4_schedule_lease_recovery(clp);
518 break;
519 case -NFS4ERR_DELAY:
520 /* The server detected a resend of the RPC call and
521 * returned NFS4ERR_DELAY as per Section 2.10.6.2
522 * of RFC5661.
523 */
524 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
525 __func__,
526 res->sr_slot - res->sr_session->fc_slot_table.slots,
527 res->sr_slot->seq_nr);
528 goto out_retry;
529 default:
530 /* Just update the slot sequence no. */
531 ++res->sr_slot->seq_nr;
532 }
533out:
534 /* The session may be reset by one of the error handlers. */
535 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
536 nfs41_sequence_free_slot(res);
537 return 1;
538out_retry:
539 if (!rpc_restart_call(task))
540 goto out;
541 rpc_delay(task, NFS4_POLL_RETRY_MAX);
542 return 0;
543}
544
545static int nfs4_sequence_done(struct rpc_task *task,
546 struct nfs4_sequence_res *res)
547{
548 if (res->sr_session == NULL)
549 return 1;
550 return nfs41_sequence_done(task, res);
551}
552
553/*
554 * nfs4_find_slot - efficiently look for a free slot
555 *
556 * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
557 * If found, we mark the slot as used, update the highest_used_slotid,
558 * and respectively set up the sequence operation args.
559 * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
560 *
561 * Note: must be called with under the slot_tbl_lock.
562 */
563static u32
564nfs4_find_slot(struct nfs4_slot_table *tbl)
565{
566 u32 slotid;
567 u32 ret_id = NFS4_NO_SLOT;
568
569 dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
570 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
571 tbl->max_slots);
572 slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
573 if (slotid >= tbl->max_slots)
574 goto out;
575 __set_bit(slotid, tbl->used_slots);
576 if (slotid > tbl->highest_used_slotid ||
577 tbl->highest_used_slotid == NFS4_NO_SLOT)
578 tbl->highest_used_slotid = slotid;
579 ret_id = slotid;
580out:
581 dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
582 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
583 return ret_id;
584}
585
586static void nfs41_init_sequence(struct nfs4_sequence_args *args,
587 struct nfs4_sequence_res *res, int cache_reply)
588{
589 args->sa_session = NULL;
590 args->sa_cache_this = 0;
591 if (cache_reply)
592 args->sa_cache_this = 1;
593 res->sr_session = NULL;
594 res->sr_slot = NULL;
595}
596
597int nfs41_setup_sequence(struct nfs4_session *session,
598 struct nfs4_sequence_args *args,
599 struct nfs4_sequence_res *res,
600 struct rpc_task *task)
601{
602 struct nfs4_slot *slot;
603 struct nfs4_slot_table *tbl;
604 u32 slotid;
605
606 dprintk("--> %s\n", __func__);
607 /* slot already allocated? */
608 if (res->sr_slot != NULL)
609 return 0;
610
611 tbl = &session->fc_slot_table;
612
613 spin_lock(&tbl->slot_tbl_lock);
614 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
615 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
616 /* The state manager will wait until the slot table is empty */
617 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
618 spin_unlock(&tbl->slot_tbl_lock);
619 dprintk("%s session is draining\n", __func__);
620 return -EAGAIN;
621 }
622
623 if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
624 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
625 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
626 spin_unlock(&tbl->slot_tbl_lock);
627 dprintk("%s enforce FIFO order\n", __func__);
628 return -EAGAIN;
629 }
630
631 slotid = nfs4_find_slot(tbl);
632 if (slotid == NFS4_NO_SLOT) {
633 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
634 spin_unlock(&tbl->slot_tbl_lock);
635 dprintk("<-- %s: no free slots\n", __func__);
636 return -EAGAIN;
637 }
638 spin_unlock(&tbl->slot_tbl_lock);
639
640 rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
641 slot = tbl->slots + slotid;
642 args->sa_session = session;
643 args->sa_slotid = slotid;
644
645 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
646
647 res->sr_session = session;
648 res->sr_slot = slot;
649 res->sr_renewal_time = jiffies;
650 res->sr_status_flags = 0;
651 /*
652 * sr_status is only set in decode_sequence, and so will remain
653 * set to 1 if an rpc level failure occurs.
654 */
655 res->sr_status = 1;
656 return 0;
657}
658EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
659
660int nfs4_setup_sequence(const struct nfs_server *server,
661 struct nfs4_sequence_args *args,
662 struct nfs4_sequence_res *res,
663 struct rpc_task *task)
664{
665 struct nfs4_session *session = nfs4_get_session(server);
666 int ret = 0;
667
668 if (session == NULL)
669 goto out;
670
671 dprintk("--> %s clp %p session %p sr_slot %td\n",
672 __func__, session->clp, session, res->sr_slot ?
673 res->sr_slot - session->fc_slot_table.slots : -1);
674
675 ret = nfs41_setup_sequence(session, args, res, task);
676out:
677 dprintk("<-- %s status=%d\n", __func__, ret);
678 return ret;
679}
680
681struct nfs41_call_sync_data {
682 const struct nfs_server *seq_server;
683 struct nfs4_sequence_args *seq_args;
684 struct nfs4_sequence_res *seq_res;
685};
686
687static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
688{
689 struct nfs41_call_sync_data *data = calldata;
690
691 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
692
693 if (nfs4_setup_sequence(data->seq_server, data->seq_args,
694 data->seq_res, task))
695 return;
696 rpc_call_start(task);
697}
698
699static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
700{
701 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
702 nfs41_call_sync_prepare(task, calldata);
703}
704
705static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
706{
707 struct nfs41_call_sync_data *data = calldata;
708
709 nfs41_sequence_done(task, data->seq_res);
710}
711
712static const struct rpc_call_ops nfs41_call_sync_ops = {
713 .rpc_call_prepare = nfs41_call_sync_prepare,
714 .rpc_call_done = nfs41_call_sync_done,
715};
716
717static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
718 .rpc_call_prepare = nfs41_call_priv_sync_prepare,
719 .rpc_call_done = nfs41_call_sync_done,
720};
721
722static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
723 struct nfs_server *server,
724 struct rpc_message *msg,
725 struct nfs4_sequence_args *args,
726 struct nfs4_sequence_res *res,
727 int privileged)
728{
729 int ret;
730 struct rpc_task *task;
731 struct nfs41_call_sync_data data = {
732 .seq_server = server,
733 .seq_args = args,
734 .seq_res = res,
735 };
736 struct rpc_task_setup task_setup = {
737 .rpc_client = clnt,
738 .rpc_message = msg,
739 .callback_ops = &nfs41_call_sync_ops,
740 .callback_data = &data
741 };
742
743 if (privileged)
744 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
745 task = rpc_run_task(&task_setup);
746 if (IS_ERR(task))
747 ret = PTR_ERR(task);
748 else {
749 ret = task->tk_status;
750 rpc_put_task(task);
751 }
752 return ret;
753}
754
755int _nfs4_call_sync_session(struct rpc_clnt *clnt,
756 struct nfs_server *server,
757 struct rpc_message *msg,
758 struct nfs4_sequence_args *args,
759 struct nfs4_sequence_res *res,
760 int cache_reply)
761{
762 nfs41_init_sequence(args, res, cache_reply);
763 return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
764}
765
766#else
767static inline
768void nfs41_init_sequence(struct nfs4_sequence_args *args,
769 struct nfs4_sequence_res *res, int cache_reply)
770{
771}
772
773static int nfs4_sequence_done(struct rpc_task *task,
774 struct nfs4_sequence_res *res)
775{
776 return 1;
777}
778#endif /* CONFIG_NFS_V4_1 */
779
780int _nfs4_call_sync(struct rpc_clnt *clnt,
781 struct nfs_server *server,
782 struct rpc_message *msg,
783 struct nfs4_sequence_args *args,
784 struct nfs4_sequence_res *res,
785 int cache_reply)
786{
787 nfs41_init_sequence(args, res, cache_reply);
788 return rpc_call_sync(clnt, msg, 0);
789}
790
791static inline
792int nfs4_call_sync(struct rpc_clnt *clnt,
793 struct nfs_server *server,
794 struct rpc_message *msg,
795 struct nfs4_sequence_args *args,
796 struct nfs4_sequence_res *res,
797 int cache_reply)
798{
799 return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
800 args, res, cache_reply);
801}
802
803static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
804{
805 struct nfs_inode *nfsi = NFS_I(dir);
806
807 spin_lock(&dir->i_lock);
808 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
809 if (!cinfo->atomic || cinfo->before != dir->i_version)
810 nfs_force_lookup_revalidate(dir);
811 dir->i_version = cinfo->after;
812 spin_unlock(&dir->i_lock);
813}
814
815struct nfs4_opendata {
816 struct kref kref;
817 struct nfs_openargs o_arg;
818 struct nfs_openres o_res;
819 struct nfs_open_confirmargs c_arg;
820 struct nfs_open_confirmres c_res;
821 struct nfs4_string owner_name;
822 struct nfs4_string group_name;
823 struct nfs_fattr f_attr;
824 struct dentry *dir;
825 struct dentry *dentry;
826 struct nfs4_state_owner *owner;
827 struct nfs4_state *state;
828 struct iattr attrs;
829 unsigned long timestamp;
830 unsigned int rpc_done : 1;
831 int rpc_status;
832 int cancelled;
833};
834
835
836static void nfs4_init_opendata_res(struct nfs4_opendata *p)
837{
838 p->o_res.f_attr = &p->f_attr;
839 p->o_res.seqid = p->o_arg.seqid;
840 p->c_res.seqid = p->c_arg.seqid;
841 p->o_res.server = p->o_arg.server;
842 p->o_res.access_request = p->o_arg.access;
843 nfs_fattr_init(&p->f_attr);
844 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
845}
846
847static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
848 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
849 const struct iattr *attrs,
850 gfp_t gfp_mask)
851{
852 struct dentry *parent = dget_parent(dentry);
853 struct inode *dir = parent->d_inode;
854 struct nfs_server *server = NFS_SERVER(dir);
855 struct nfs4_opendata *p;
856
857 p = kzalloc(sizeof(*p), gfp_mask);
858 if (p == NULL)
859 goto err;
860 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
861 if (p->o_arg.seqid == NULL)
862 goto err_free;
863 nfs_sb_active(dentry->d_sb);
864 p->dentry = dget(dentry);
865 p->dir = parent;
866 p->owner = sp;
867 atomic_inc(&sp->so_count);
868 p->o_arg.fh = NFS_FH(dir);
869 p->o_arg.open_flags = flags;
870 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
871 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
872 * will return permission denied for all bits until close */
873 if (!(flags & O_EXCL)) {
874 /* ask server to check for all possible rights as results
875 * are cached */
876 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
877 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
878 }
879 p->o_arg.clientid = server->nfs_client->cl_clientid;
880 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
881 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
882 p->o_arg.name = &dentry->d_name;
883 p->o_arg.server = server;
884 p->o_arg.bitmask = server->attr_bitmask;
885 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
886 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
887 if (attrs != NULL && attrs->ia_valid != 0) {
888 __be32 verf[2];
889
890 p->o_arg.u.attrs = &p->attrs;
891 memcpy(&p->attrs, attrs, sizeof(p->attrs));
892
893 verf[0] = jiffies;
894 verf[1] = current->pid;
895 memcpy(p->o_arg.u.verifier.data, verf,
896 sizeof(p->o_arg.u.verifier.data));
897 }
898 p->c_arg.fh = &p->o_res.fh;
899 p->c_arg.stateid = &p->o_res.stateid;
900 p->c_arg.seqid = p->o_arg.seqid;
901 nfs4_init_opendata_res(p);
902 kref_init(&p->kref);
903 return p;
904err_free:
905 kfree(p);
906err:
907 dput(parent);
908 return NULL;
909}
910
911static void nfs4_opendata_free(struct kref *kref)
912{
913 struct nfs4_opendata *p = container_of(kref,
914 struct nfs4_opendata, kref);
915 struct super_block *sb = p->dentry->d_sb;
916
917 nfs_free_seqid(p->o_arg.seqid);
918 if (p->state != NULL)
919 nfs4_put_open_state(p->state);
920 nfs4_put_state_owner(p->owner);
921 dput(p->dir);
922 dput(p->dentry);
923 nfs_sb_deactive(sb);
924 nfs_fattr_free_names(&p->f_attr);
925 kfree(p);
926}
927
928static void nfs4_opendata_put(struct nfs4_opendata *p)
929{
930 if (p != NULL)
931 kref_put(&p->kref, nfs4_opendata_free);
932}
933
934static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
935{
936 int ret;
937
938 ret = rpc_wait_for_completion_task(task);
939 return ret;
940}
941
942static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
943{
944 int ret = 0;
945
946 if (open_mode & (O_EXCL|O_TRUNC))
947 goto out;
948 switch (mode & (FMODE_READ|FMODE_WRITE)) {
949 case FMODE_READ:
950 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
951 && state->n_rdonly != 0;
952 break;
953 case FMODE_WRITE:
954 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
955 && state->n_wronly != 0;
956 break;
957 case FMODE_READ|FMODE_WRITE:
958 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
959 && state->n_rdwr != 0;
960 }
961out:
962 return ret;
963}
964
965static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
966{
967 if (delegation == NULL)
968 return 0;
969 if ((delegation->type & fmode) != fmode)
970 return 0;
971 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
972 return 0;
973 nfs_mark_delegation_referenced(delegation);
974 return 1;
975}
976
977static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
978{
979 switch (fmode) {
980 case FMODE_WRITE:
981 state->n_wronly++;
982 break;
983 case FMODE_READ:
984 state->n_rdonly++;
985 break;
986 case FMODE_READ|FMODE_WRITE:
987 state->n_rdwr++;
988 }
989 nfs4_state_set_mode_locked(state, state->state | fmode);
990}
991
992static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
993{
994 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
995 nfs4_stateid_copy(&state->stateid, stateid);
996 nfs4_stateid_copy(&state->open_stateid, stateid);
997 switch (fmode) {
998 case FMODE_READ:
999 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1000 break;
1001 case FMODE_WRITE:
1002 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1003 break;
1004 case FMODE_READ|FMODE_WRITE:
1005 set_bit(NFS_O_RDWR_STATE, &state->flags);
1006 }
1007}
1008
1009static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1010{
1011 write_seqlock(&state->seqlock);
1012 nfs_set_open_stateid_locked(state, stateid, fmode);
1013 write_sequnlock(&state->seqlock);
1014}
1015
1016static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1017{
1018 /*
1019 * Protect the call to nfs4_state_set_mode_locked and
1020 * serialise the stateid update
1021 */
1022 write_seqlock(&state->seqlock);
1023 if (deleg_stateid != NULL) {
1024 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1025 set_bit(NFS_DELEGATED_STATE, &state->flags);
1026 }
1027 if (open_stateid != NULL)
1028 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1029 write_sequnlock(&state->seqlock);
1030 spin_lock(&state->owner->so_lock);
1031 update_open_stateflags(state, fmode);
1032 spin_unlock(&state->owner->so_lock);
1033}
1034
1035static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1036{
1037 struct nfs_inode *nfsi = NFS_I(state->inode);
1038 struct nfs_delegation *deleg_cur;
1039 int ret = 0;
1040
1041 fmode &= (FMODE_READ|FMODE_WRITE);
1042
1043 rcu_read_lock();
1044 deleg_cur = rcu_dereference(nfsi->delegation);
1045 if (deleg_cur == NULL)
1046 goto no_delegation;
1047
1048 spin_lock(&deleg_cur->lock);
1049 if (nfsi->delegation != deleg_cur ||
1050 (deleg_cur->type & fmode) != fmode)
1051 goto no_delegation_unlock;
1052
1053 if (delegation == NULL)
1054 delegation = &deleg_cur->stateid;
1055 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1056 goto no_delegation_unlock;
1057
1058 nfs_mark_delegation_referenced(deleg_cur);
1059 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1060 ret = 1;
1061no_delegation_unlock:
1062 spin_unlock(&deleg_cur->lock);
1063no_delegation:
1064 rcu_read_unlock();
1065
1066 if (!ret && open_stateid != NULL) {
1067 __update_open_stateid(state, open_stateid, NULL, fmode);
1068 ret = 1;
1069 }
1070
1071 return ret;
1072}
1073
1074
1075static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1076{
1077 struct nfs_delegation *delegation;
1078
1079 rcu_read_lock();
1080 delegation = rcu_dereference(NFS_I(inode)->delegation);
1081 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1082 rcu_read_unlock();
1083 return;
1084 }
1085 rcu_read_unlock();
1086 nfs4_inode_return_delegation(inode);
1087}
1088
1089static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1090{
1091 struct nfs4_state *state = opendata->state;
1092 struct nfs_inode *nfsi = NFS_I(state->inode);
1093 struct nfs_delegation *delegation;
1094 int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1095 fmode_t fmode = opendata->o_arg.fmode;
1096 nfs4_stateid stateid;
1097 int ret = -EAGAIN;
1098
1099 for (;;) {
1100 if (can_open_cached(state, fmode, open_mode)) {
1101 spin_lock(&state->owner->so_lock);
1102 if (can_open_cached(state, fmode, open_mode)) {
1103 update_open_stateflags(state, fmode);
1104 spin_unlock(&state->owner->so_lock);
1105 goto out_return_state;
1106 }
1107 spin_unlock(&state->owner->so_lock);
1108 }
1109 rcu_read_lock();
1110 delegation = rcu_dereference(nfsi->delegation);
1111 if (!can_open_delegated(delegation, fmode)) {
1112 rcu_read_unlock();
1113 break;
1114 }
1115 /* Save the delegation */
1116 nfs4_stateid_copy(&stateid, &delegation->stateid);
1117 rcu_read_unlock();
1118 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1119 if (ret != 0)
1120 goto out;
1121 ret = -EAGAIN;
1122
1123 /* Try to update the stateid using the delegation */
1124 if (update_open_stateid(state, NULL, &stateid, fmode))
1125 goto out_return_state;
1126 }
1127out:
1128 return ERR_PTR(ret);
1129out_return_state:
1130 atomic_inc(&state->count);
1131 return state;
1132}
1133
1134static void
1135nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1136{
1137 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1138 struct nfs_delegation *delegation;
1139 int delegation_flags = 0;
1140
1141 rcu_read_lock();
1142 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1143 if (delegation)
1144 delegation_flags = delegation->flags;
1145 rcu_read_unlock();
1146 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1147 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1148 "returning a delegation for "
1149 "OPEN(CLAIM_DELEGATE_CUR)\n",
1150 clp->cl_hostname);
1151 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1152 nfs_inode_set_delegation(state->inode,
1153 data->owner->so_cred,
1154 &data->o_res);
1155 else
1156 nfs_inode_reclaim_delegation(state->inode,
1157 data->owner->so_cred,
1158 &data->o_res);
1159}
1160
1161/*
1162 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1163 * and update the nfs4_state.
1164 */
1165static struct nfs4_state *
1166_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1167{
1168 struct inode *inode = data->state->inode;
1169 struct nfs4_state *state = data->state;
1170 int ret;
1171
1172 if (!data->rpc_done) {
1173 ret = data->rpc_status;
1174 goto err;
1175 }
1176
1177 ret = -ESTALE;
1178 if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1179 !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1180 !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1181 goto err;
1182
1183 ret = -ENOMEM;
1184 state = nfs4_get_open_state(inode, data->owner);
1185 if (state == NULL)
1186 goto err;
1187
1188 ret = nfs_refresh_inode(inode, &data->f_attr);
1189 if (ret)
1190 goto err;
1191
1192 if (data->o_res.delegation_type != 0)
1193 nfs4_opendata_check_deleg(data, state);
1194 update_open_stateid(state, &data->o_res.stateid, NULL,
1195 data->o_arg.fmode);
1196
1197 return state;
1198err:
1199 return ERR_PTR(ret);
1200
1201}
1202
1203static struct nfs4_state *
1204_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1205{
1206 struct inode *inode;
1207 struct nfs4_state *state = NULL;
1208 int ret;
1209
1210 if (!data->rpc_done) {
1211 state = nfs4_try_open_cached(data);
1212 goto out;
1213 }
1214
1215 ret = -EAGAIN;
1216 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1217 goto err;
1218 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1219 ret = PTR_ERR(inode);
1220 if (IS_ERR(inode))
1221 goto err;
1222 ret = -ENOMEM;
1223 state = nfs4_get_open_state(inode, data->owner);
1224 if (state == NULL)
1225 goto err_put_inode;
1226 if (data->o_res.delegation_type != 0)
1227 nfs4_opendata_check_deleg(data, state);
1228 update_open_stateid(state, &data->o_res.stateid, NULL,
1229 data->o_arg.fmode);
1230 iput(inode);
1231out:
1232 return state;
1233err_put_inode:
1234 iput(inode);
1235err:
1236 return ERR_PTR(ret);
1237}
1238
1239static struct nfs4_state *
1240nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1241{
1242 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1243 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1244 return _nfs4_opendata_to_nfs4_state(data);
1245}
1246
1247static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1248{
1249 struct nfs_inode *nfsi = NFS_I(state->inode);
1250 struct nfs_open_context *ctx;
1251
1252 spin_lock(&state->inode->i_lock);
1253 list_for_each_entry(ctx, &nfsi->open_files, list) {
1254 if (ctx->state != state)
1255 continue;
1256 get_nfs_open_context(ctx);
1257 spin_unlock(&state->inode->i_lock);
1258 return ctx;
1259 }
1260 spin_unlock(&state->inode->i_lock);
1261 return ERR_PTR(-ENOENT);
1262}
1263
1264static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1265{
1266 struct nfs4_opendata *opendata;
1267
1268 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1269 if (opendata == NULL)
1270 return ERR_PTR(-ENOMEM);
1271 opendata->state = state;
1272 atomic_inc(&state->count);
1273 return opendata;
1274}
1275
1276static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1277{
1278 struct nfs4_state *newstate;
1279 int ret;
1280
1281 opendata->o_arg.open_flags = 0;
1282 opendata->o_arg.fmode = fmode;
1283 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1284 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1285 nfs4_init_opendata_res(opendata);
1286 ret = _nfs4_recover_proc_open(opendata);
1287 if (ret != 0)
1288 return ret;
1289 newstate = nfs4_opendata_to_nfs4_state(opendata);
1290 if (IS_ERR(newstate))
1291 return PTR_ERR(newstate);
1292 nfs4_close_state(newstate, fmode);
1293 *res = newstate;
1294 return 0;
1295}
1296
1297static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1298{
1299 struct nfs4_state *newstate;
1300 int ret;
1301
1302 /* memory barrier prior to reading state->n_* */
1303 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1304 smp_rmb();
1305 if (state->n_rdwr != 0) {
1306 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1307 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1308 if (ret != 0)
1309 return ret;
1310 if (newstate != state)
1311 return -ESTALE;
1312 }
1313 if (state->n_wronly != 0) {
1314 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1315 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1316 if (ret != 0)
1317 return ret;
1318 if (newstate != state)
1319 return -ESTALE;
1320 }
1321 if (state->n_rdonly != 0) {
1322 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1323 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1324 if (ret != 0)
1325 return ret;
1326 if (newstate != state)
1327 return -ESTALE;
1328 }
1329 /*
1330 * We may have performed cached opens for all three recoveries.
1331 * Check if we need to update the current stateid.
1332 */
1333 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1334 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1335 write_seqlock(&state->seqlock);
1336 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1337 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1338 write_sequnlock(&state->seqlock);
1339 }
1340 return 0;
1341}
1342
1343/*
1344 * OPEN_RECLAIM:
1345 * reclaim state on the server after a reboot.
1346 */
1347static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1348{
1349 struct nfs_delegation *delegation;
1350 struct nfs4_opendata *opendata;
1351 fmode_t delegation_type = 0;
1352 int status;
1353
1354 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1355 if (IS_ERR(opendata))
1356 return PTR_ERR(opendata);
1357 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1358 opendata->o_arg.fh = NFS_FH(state->inode);
1359 rcu_read_lock();
1360 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1361 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1362 delegation_type = delegation->type;
1363 rcu_read_unlock();
1364 opendata->o_arg.u.delegation_type = delegation_type;
1365 status = nfs4_open_recover(opendata, state);
1366 nfs4_opendata_put(opendata);
1367 return status;
1368}
1369
1370static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1371{
1372 struct nfs_server *server = NFS_SERVER(state->inode);
1373 struct nfs4_exception exception = { };
1374 int err;
1375 do {
1376 err = _nfs4_do_open_reclaim(ctx, state);
1377 if (err != -NFS4ERR_DELAY)
1378 break;
1379 nfs4_handle_exception(server, err, &exception);
1380 } while (exception.retry);
1381 return err;
1382}
1383
1384static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1385{
1386 struct nfs_open_context *ctx;
1387 int ret;
1388
1389 ctx = nfs4_state_find_open_context(state);
1390 if (IS_ERR(ctx))
1391 return PTR_ERR(ctx);
1392 ret = nfs4_do_open_reclaim(ctx, state);
1393 put_nfs_open_context(ctx);
1394 return ret;
1395}
1396
1397static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1398{
1399 struct nfs4_opendata *opendata;
1400 int ret;
1401
1402 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1403 if (IS_ERR(opendata))
1404 return PTR_ERR(opendata);
1405 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1406 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1407 ret = nfs4_open_recover(opendata, state);
1408 nfs4_opendata_put(opendata);
1409 return ret;
1410}
1411
1412int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1413{
1414 struct nfs4_exception exception = { };
1415 struct nfs_server *server = NFS_SERVER(state->inode);
1416 int err;
1417 do {
1418 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1419 switch (err) {
1420 case 0:
1421 case -ENOENT:
1422 case -ESTALE:
1423 goto out;
1424 case -NFS4ERR_BADSESSION:
1425 case -NFS4ERR_BADSLOT:
1426 case -NFS4ERR_BAD_HIGH_SLOT:
1427 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1428 case -NFS4ERR_DEADSESSION:
1429 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1430 goto out;
1431 case -NFS4ERR_STALE_CLIENTID:
1432 case -NFS4ERR_STALE_STATEID:
1433 case -NFS4ERR_EXPIRED:
1434 /* Don't recall a delegation if it was lost */
1435 nfs4_schedule_lease_recovery(server->nfs_client);
1436 goto out;
1437 case -ERESTARTSYS:
1438 /*
1439 * The show must go on: exit, but mark the
1440 * stateid as needing recovery.
1441 */
1442 case -NFS4ERR_DELEG_REVOKED:
1443 case -NFS4ERR_ADMIN_REVOKED:
1444 case -NFS4ERR_BAD_STATEID:
1445 nfs_inode_find_state_and_recover(state->inode,
1446 stateid);
1447 nfs4_schedule_stateid_recovery(server, state);
1448 case -EKEYEXPIRED:
1449 /*
1450 * User RPCSEC_GSS context has expired.
1451 * We cannot recover this stateid now, so
1452 * skip it and allow recovery thread to
1453 * proceed.
1454 */
1455 case -ENOMEM:
1456 err = 0;
1457 goto out;
1458 }
1459 err = nfs4_handle_exception(server, err, &exception);
1460 } while (exception.retry);
1461out:
1462 return err;
1463}
1464
1465static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1466{
1467 struct nfs4_opendata *data = calldata;
1468
1469 data->rpc_status = task->tk_status;
1470 if (data->rpc_status == 0) {
1471 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1472 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1473 renew_lease(data->o_res.server, data->timestamp);
1474 data->rpc_done = 1;
1475 }
1476}
1477
1478static void nfs4_open_confirm_release(void *calldata)
1479{
1480 struct nfs4_opendata *data = calldata;
1481 struct nfs4_state *state = NULL;
1482
1483 /* If this request hasn't been cancelled, do nothing */
1484 if (data->cancelled == 0)
1485 goto out_free;
1486 /* In case of error, no cleanup! */
1487 if (!data->rpc_done)
1488 goto out_free;
1489 state = nfs4_opendata_to_nfs4_state(data);
1490 if (!IS_ERR(state))
1491 nfs4_close_state(state, data->o_arg.fmode);
1492out_free:
1493 nfs4_opendata_put(data);
1494}
1495
1496static const struct rpc_call_ops nfs4_open_confirm_ops = {
1497 .rpc_call_done = nfs4_open_confirm_done,
1498 .rpc_release = nfs4_open_confirm_release,
1499};
1500
1501/*
1502 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1503 */
1504static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1505{
1506 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1507 struct rpc_task *task;
1508 struct rpc_message msg = {
1509 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1510 .rpc_argp = &data->c_arg,
1511 .rpc_resp = &data->c_res,
1512 .rpc_cred = data->owner->so_cred,
1513 };
1514 struct rpc_task_setup task_setup_data = {
1515 .rpc_client = server->client,
1516 .rpc_message = &msg,
1517 .callback_ops = &nfs4_open_confirm_ops,
1518 .callback_data = data,
1519 .workqueue = nfsiod_workqueue,
1520 .flags = RPC_TASK_ASYNC,
1521 };
1522 int status;
1523
1524 kref_get(&data->kref);
1525 data->rpc_done = 0;
1526 data->rpc_status = 0;
1527 data->timestamp = jiffies;
1528 task = rpc_run_task(&task_setup_data);
1529 if (IS_ERR(task))
1530 return PTR_ERR(task);
1531 status = nfs4_wait_for_completion_rpc_task(task);
1532 if (status != 0) {
1533 data->cancelled = 1;
1534 smp_wmb();
1535 } else
1536 status = data->rpc_status;
1537 rpc_put_task(task);
1538 return status;
1539}
1540
1541static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1542{
1543 struct nfs4_opendata *data = calldata;
1544 struct nfs4_state_owner *sp = data->owner;
1545
1546 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1547 return;
1548 /*
1549 * Check if we still need to send an OPEN call, or if we can use
1550 * a delegation instead.
1551 */
1552 if (data->state != NULL) {
1553 struct nfs_delegation *delegation;
1554
1555 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1556 goto out_no_action;
1557 rcu_read_lock();
1558 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1559 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1560 can_open_delegated(delegation, data->o_arg.fmode))
1561 goto unlock_no_action;
1562 rcu_read_unlock();
1563 }
1564 /* Update client id. */
1565 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1566 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1567 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1568 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1569 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1570 }
1571 data->timestamp = jiffies;
1572 if (nfs4_setup_sequence(data->o_arg.server,
1573 &data->o_arg.seq_args,
1574 &data->o_res.seq_res,
1575 task) != 0)
1576 nfs_release_seqid(data->o_arg.seqid);
1577 else
1578 rpc_call_start(task);
1579 return;
1580unlock_no_action:
1581 rcu_read_unlock();
1582out_no_action:
1583 task->tk_action = NULL;
1584
1585}
1586
1587static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1588{
1589 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1590 nfs4_open_prepare(task, calldata);
1591}
1592
1593static void nfs4_open_done(struct rpc_task *task, void *calldata)
1594{
1595 struct nfs4_opendata *data = calldata;
1596
1597 data->rpc_status = task->tk_status;
1598
1599 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1600 return;
1601
1602 if (task->tk_status == 0) {
1603 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1604 switch (data->o_res.f_attr->mode & S_IFMT) {
1605 case S_IFREG:
1606 break;
1607 case S_IFLNK:
1608 data->rpc_status = -ELOOP;
1609 break;
1610 case S_IFDIR:
1611 data->rpc_status = -EISDIR;
1612 break;
1613 default:
1614 data->rpc_status = -ENOTDIR;
1615 }
1616 }
1617 renew_lease(data->o_res.server, data->timestamp);
1618 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1619 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1620 }
1621 data->rpc_done = 1;
1622}
1623
1624static void nfs4_open_release(void *calldata)
1625{
1626 struct nfs4_opendata *data = calldata;
1627 struct nfs4_state *state = NULL;
1628
1629 /* If this request hasn't been cancelled, do nothing */
1630 if (data->cancelled == 0)
1631 goto out_free;
1632 /* In case of error, no cleanup! */
1633 if (data->rpc_status != 0 || !data->rpc_done)
1634 goto out_free;
1635 /* In case we need an open_confirm, no cleanup! */
1636 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1637 goto out_free;
1638 state = nfs4_opendata_to_nfs4_state(data);
1639 if (!IS_ERR(state))
1640 nfs4_close_state(state, data->o_arg.fmode);
1641out_free:
1642 nfs4_opendata_put(data);
1643}
1644
1645static const struct rpc_call_ops nfs4_open_ops = {
1646 .rpc_call_prepare = nfs4_open_prepare,
1647 .rpc_call_done = nfs4_open_done,
1648 .rpc_release = nfs4_open_release,
1649};
1650
1651static const struct rpc_call_ops nfs4_recover_open_ops = {
1652 .rpc_call_prepare = nfs4_recover_open_prepare,
1653 .rpc_call_done = nfs4_open_done,
1654 .rpc_release = nfs4_open_release,
1655};
1656
1657static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1658{
1659 struct inode *dir = data->dir->d_inode;
1660 struct nfs_server *server = NFS_SERVER(dir);
1661 struct nfs_openargs *o_arg = &data->o_arg;
1662 struct nfs_openres *o_res = &data->o_res;
1663 struct rpc_task *task;
1664 struct rpc_message msg = {
1665 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1666 .rpc_argp = o_arg,
1667 .rpc_resp = o_res,
1668 .rpc_cred = data->owner->so_cred,
1669 };
1670 struct rpc_task_setup task_setup_data = {
1671 .rpc_client = server->client,
1672 .rpc_message = &msg,
1673 .callback_ops = &nfs4_open_ops,
1674 .callback_data = data,
1675 .workqueue = nfsiod_workqueue,
1676 .flags = RPC_TASK_ASYNC,
1677 };
1678 int status;
1679
1680 nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1681 kref_get(&data->kref);
1682 data->rpc_done = 0;
1683 data->rpc_status = 0;
1684 data->cancelled = 0;
1685 if (isrecover)
1686 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1687 task = rpc_run_task(&task_setup_data);
1688 if (IS_ERR(task))
1689 return PTR_ERR(task);
1690 status = nfs4_wait_for_completion_rpc_task(task);
1691 if (status != 0) {
1692 data->cancelled = 1;
1693 smp_wmb();
1694 } else
1695 status = data->rpc_status;
1696 rpc_put_task(task);
1697
1698 return status;
1699}
1700
1701static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1702{
1703 struct inode *dir = data->dir->d_inode;
1704 struct nfs_openres *o_res = &data->o_res;
1705 int status;
1706
1707 status = nfs4_run_open_task(data, 1);
1708 if (status != 0 || !data->rpc_done)
1709 return status;
1710
1711 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1712
1713 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1714 status = _nfs4_proc_open_confirm(data);
1715 if (status != 0)
1716 return status;
1717 }
1718
1719 return status;
1720}
1721
1722static int nfs4_opendata_access(struct rpc_cred *cred,
1723 struct nfs4_opendata *opendata,
1724 struct nfs4_state *state, fmode_t fmode)
1725{
1726 struct nfs_access_entry cache;
1727 u32 mask;
1728
1729 /* access call failed or for some reason the server doesn't
1730 * support any access modes -- defer access call until later */
1731 if (opendata->o_res.access_supported == 0)
1732 return 0;
1733
1734 mask = 0;
1735 /* don't check MAY_WRITE - a newly created file may not have
1736 * write mode bits, but POSIX allows the creating process to write */
1737 if (fmode & FMODE_READ)
1738 mask |= MAY_READ;
1739 if (fmode & FMODE_EXEC)
1740 mask |= MAY_EXEC;
1741
1742 cache.cred = cred;
1743 cache.jiffies = jiffies;
1744 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1745 nfs_access_add_cache(state->inode, &cache);
1746
1747 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1748 return 0;
1749
1750 /* even though OPEN succeeded, access is denied. Close the file */
1751 nfs4_close_state(state, fmode);
1752 return -NFS4ERR_ACCESS;
1753}
1754
1755/*
1756 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1757 */
1758static int _nfs4_proc_open(struct nfs4_opendata *data)
1759{
1760 struct inode *dir = data->dir->d_inode;
1761 struct nfs_server *server = NFS_SERVER(dir);
1762 struct nfs_openargs *o_arg = &data->o_arg;
1763 struct nfs_openres *o_res = &data->o_res;
1764 int status;
1765
1766 status = nfs4_run_open_task(data, 0);
1767 if (!data->rpc_done)
1768 return status;
1769 if (status != 0) {
1770 if (status == -NFS4ERR_BADNAME &&
1771 !(o_arg->open_flags & O_CREAT))
1772 return -ENOENT;
1773 return status;
1774 }
1775
1776 nfs_fattr_map_and_free_names(server, &data->f_attr);
1777
1778 if (o_arg->open_flags & O_CREAT)
1779 update_changeattr(dir, &o_res->cinfo);
1780 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1781 server->caps &= ~NFS_CAP_POSIX_LOCK;
1782 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1783 status = _nfs4_proc_open_confirm(data);
1784 if (status != 0)
1785 return status;
1786 }
1787 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1788 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1789 return 0;
1790}
1791
1792static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1793{
1794 unsigned int loop;
1795 int ret;
1796
1797 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1798 ret = nfs4_wait_clnt_recover(clp);
1799 if (ret != 0)
1800 break;
1801 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1802 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1803 break;
1804 nfs4_schedule_state_manager(clp);
1805 ret = -EIO;
1806 }
1807 return ret;
1808}
1809
1810static int nfs4_recover_expired_lease(struct nfs_server *server)
1811{
1812 return nfs4_client_recover_expired_lease(server->nfs_client);
1813}
1814
1815/*
1816 * OPEN_EXPIRED:
1817 * reclaim state on the server after a network partition.
1818 * Assumes caller holds the appropriate lock
1819 */
1820static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1821{
1822 struct nfs4_opendata *opendata;
1823 int ret;
1824
1825 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1826 if (IS_ERR(opendata))
1827 return PTR_ERR(opendata);
1828 ret = nfs4_open_recover(opendata, state);
1829 if (ret == -ESTALE)
1830 d_drop(ctx->dentry);
1831 nfs4_opendata_put(opendata);
1832 return ret;
1833}
1834
1835static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1836{
1837 struct nfs_server *server = NFS_SERVER(state->inode);
1838 struct nfs4_exception exception = { };
1839 int err;
1840
1841 do {
1842 err = _nfs4_open_expired(ctx, state);
1843 switch (err) {
1844 default:
1845 goto out;
1846 case -NFS4ERR_GRACE:
1847 case -NFS4ERR_DELAY:
1848 nfs4_handle_exception(server, err, &exception);
1849 err = 0;
1850 }
1851 } while (exception.retry);
1852out:
1853 return err;
1854}
1855
1856static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1857{
1858 struct nfs_open_context *ctx;
1859 int ret;
1860
1861 ctx = nfs4_state_find_open_context(state);
1862 if (IS_ERR(ctx))
1863 return PTR_ERR(ctx);
1864 ret = nfs4_do_open_expired(ctx, state);
1865 put_nfs_open_context(ctx);
1866 return ret;
1867}
1868
1869#if defined(CONFIG_NFS_V4_1)
1870static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1871{
1872 struct nfs_server *server = NFS_SERVER(state->inode);
1873 nfs4_stateid *stateid = &state->stateid;
1874 int status;
1875
1876 /* If a state reset has been done, test_stateid is unneeded */
1877 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1878 return;
1879
1880 status = nfs41_test_stateid(server, stateid);
1881 if (status != NFS_OK) {
1882 /* Free the stateid unless the server explicitly
1883 * informs us the stateid is unrecognized. */
1884 if (status != -NFS4ERR_BAD_STATEID)
1885 nfs41_free_stateid(server, stateid);
1886 nfs_remove_bad_delegation(state->inode);
1887
1888 write_seqlock(&state->seqlock);
1889 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1890 write_sequnlock(&state->seqlock);
1891 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1892 }
1893}
1894
1895/**
1896 * nfs41_check_open_stateid - possibly free an open stateid
1897 *
1898 * @state: NFSv4 state for an inode
1899 *
1900 * Returns NFS_OK if recovery for this stateid is now finished.
1901 * Otherwise a negative NFS4ERR value is returned.
1902 */
1903static int nfs41_check_open_stateid(struct nfs4_state *state)
1904{
1905 struct nfs_server *server = NFS_SERVER(state->inode);
1906 nfs4_stateid *stateid = &state->open_stateid;
1907 int status;
1908
1909 /* If a state reset has been done, test_stateid is unneeded */
1910 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1911 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1912 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1913 return -NFS4ERR_BAD_STATEID;
1914
1915 status = nfs41_test_stateid(server, stateid);
1916 if (status != NFS_OK) {
1917 /* Free the stateid unless the server explicitly
1918 * informs us the stateid is unrecognized. */
1919 if (status != -NFS4ERR_BAD_STATEID)
1920 nfs41_free_stateid(server, stateid);
1921
1922 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1923 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1924 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1925 }
1926 return status;
1927}
1928
1929static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1930{
1931 int status;
1932
1933 nfs41_clear_delegation_stateid(state);
1934 status = nfs41_check_open_stateid(state);
1935 if (status != NFS_OK)
1936 status = nfs4_open_expired(sp, state);
1937 return status;
1938}
1939#endif
1940
1941/*
1942 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1943 * fields corresponding to attributes that were used to store the verifier.
1944 * Make sure we clobber those fields in the later setattr call
1945 */
1946static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1947{
1948 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1949 !(sattr->ia_valid & ATTR_ATIME_SET))
1950 sattr->ia_valid |= ATTR_ATIME;
1951
1952 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1953 !(sattr->ia_valid & ATTR_MTIME_SET))
1954 sattr->ia_valid |= ATTR_MTIME;
1955}
1956
1957/*
1958 * Returns a referenced nfs4_state
1959 */
1960static int _nfs4_do_open(struct inode *dir,
1961 struct dentry *dentry,
1962 fmode_t fmode,
1963 int flags,
1964 struct iattr *sattr,
1965 struct rpc_cred *cred,
1966 struct nfs4_state **res,
1967 struct nfs4_threshold **ctx_th)
1968{
1969 struct nfs4_state_owner *sp;
1970 struct nfs4_state *state = NULL;
1971 struct nfs_server *server = NFS_SERVER(dir);
1972 struct nfs4_opendata *opendata;
1973 int status;
1974
1975 /* Protect against reboot recovery conflicts */
1976 status = -ENOMEM;
1977 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1978 if (sp == NULL) {
1979 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1980 goto out_err;
1981 }
1982 status = nfs4_recover_expired_lease(server);
1983 if (status != 0)
1984 goto err_put_state_owner;
1985 if (dentry->d_inode != NULL)
1986 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1987 status = -ENOMEM;
1988 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1989 if (opendata == NULL)
1990 goto err_put_state_owner;
1991
1992 if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1993 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1994 if (!opendata->f_attr.mdsthreshold)
1995 goto err_opendata_put;
1996 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1997 }
1998 if (dentry->d_inode != NULL)
1999 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2000
2001 status = _nfs4_proc_open(opendata);
2002 if (status != 0)
2003 goto err_opendata_put;
2004
2005 state = nfs4_opendata_to_nfs4_state(opendata);
2006 status = PTR_ERR(state);
2007 if (IS_ERR(state))
2008 goto err_opendata_put;
2009 if (server->caps & NFS_CAP_POSIX_LOCK)
2010 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2011
2012 status = nfs4_opendata_access(cred, opendata, state, fmode);
2013 if (status != 0)
2014 goto err_opendata_put;
2015
2016 if (opendata->o_arg.open_flags & O_EXCL) {
2017 nfs4_exclusive_attrset(opendata, sattr);
2018
2019 nfs_fattr_init(opendata->o_res.f_attr);
2020 status = nfs4_do_setattr(state->inode, cred,
2021 opendata->o_res.f_attr, sattr,
2022 state);
2023 if (status == 0)
2024 nfs_setattr_update_inode(state->inode, sattr);
2025 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2026 }
2027
2028 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2029 *ctx_th = opendata->f_attr.mdsthreshold;
2030 else
2031 kfree(opendata->f_attr.mdsthreshold);
2032 opendata->f_attr.mdsthreshold = NULL;
2033
2034 nfs4_opendata_put(opendata);
2035 nfs4_put_state_owner(sp);
2036 *res = state;
2037 return 0;
2038err_opendata_put:
2039 kfree(opendata->f_attr.mdsthreshold);
2040 nfs4_opendata_put(opendata);
2041err_put_state_owner:
2042 nfs4_put_state_owner(sp);
2043out_err:
2044 *res = NULL;
2045 return status;
2046}
2047
2048
2049static struct nfs4_state *nfs4_do_open(struct inode *dir,
2050 struct dentry *dentry,
2051 fmode_t fmode,
2052 int flags,
2053 struct iattr *sattr,
2054 struct rpc_cred *cred,
2055 struct nfs4_threshold **ctx_th)
2056{
2057 struct nfs4_exception exception = { };
2058 struct nfs4_state *res;
2059 int status;
2060
2061 fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2062 do {
2063 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2064 &res, ctx_th);
2065 if (status == 0)
2066 break;
2067 /* NOTE: BAD_SEQID means the server and client disagree about the
2068 * book-keeping w.r.t. state-changing operations
2069 * (OPEN/CLOSE/LOCK/LOCKU...)
2070 * It is actually a sign of a bug on the client or on the server.
2071 *
2072 * If we receive a BAD_SEQID error in the particular case of
2073 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2074 * have unhashed the old state_owner for us, and that we can
2075 * therefore safely retry using a new one. We should still warn
2076 * the user though...
2077 */
2078 if (status == -NFS4ERR_BAD_SEQID) {
2079 pr_warn_ratelimited("NFS: v4 server %s "
2080 " returned a bad sequence-id error!\n",
2081 NFS_SERVER(dir)->nfs_client->cl_hostname);
2082 exception.retry = 1;
2083 continue;
2084 }
2085 /*
2086 * BAD_STATEID on OPEN means that the server cancelled our
2087 * state before it received the OPEN_CONFIRM.
2088 * Recover by retrying the request as per the discussion
2089 * on Page 181 of RFC3530.
2090 */
2091 if (status == -NFS4ERR_BAD_STATEID) {
2092 exception.retry = 1;
2093 continue;
2094 }
2095 if (status == -EAGAIN) {
2096 /* We must have found a delegation */
2097 exception.retry = 1;
2098 continue;
2099 }
2100 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2101 status, &exception));
2102 } while (exception.retry);
2103 return res;
2104}
2105
2106static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2107 struct nfs_fattr *fattr, struct iattr *sattr,
2108 struct nfs4_state *state)
2109{
2110 struct nfs_server *server = NFS_SERVER(inode);
2111 struct nfs_setattrargs arg = {
2112 .fh = NFS_FH(inode),
2113 .iap = sattr,
2114 .server = server,
2115 .bitmask = server->attr_bitmask,
2116 };
2117 struct nfs_setattrres res = {
2118 .fattr = fattr,
2119 .server = server,
2120 };
2121 struct rpc_message msg = {
2122 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2123 .rpc_argp = &arg,
2124 .rpc_resp = &res,
2125 .rpc_cred = cred,
2126 };
2127 unsigned long timestamp = jiffies;
2128 int status;
2129
2130 nfs_fattr_init(fattr);
2131
2132 if (state != NULL) {
2133 struct nfs_lockowner lockowner = {
2134 .l_owner = current->files,
2135 .l_pid = current->tgid,
2136 };
2137 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2138 &lockowner);
2139 } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2140 FMODE_WRITE)) {
2141 /* Use that stateid */
2142 } else
2143 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2144
2145 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2146 if (status == 0 && state != NULL)
2147 renew_lease(server, timestamp);
2148 return status;
2149}
2150
2151static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2152 struct nfs_fattr *fattr, struct iattr *sattr,
2153 struct nfs4_state *state)
2154{
2155 struct nfs_server *server = NFS_SERVER(inode);
2156 struct nfs4_exception exception = {
2157 .state = state,
2158 .inode = inode,
2159 };
2160 int err;
2161 do {
2162 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2163 switch (err) {
2164 case -NFS4ERR_OPENMODE:
2165 if (state && !(state->state & FMODE_WRITE)) {
2166 err = -EBADF;
2167 if (sattr->ia_valid & ATTR_OPEN)
2168 err = -EACCES;
2169 goto out;
2170 }
2171 }
2172 err = nfs4_handle_exception(server, err, &exception);
2173 } while (exception.retry);
2174out:
2175 return err;
2176}
2177
2178struct nfs4_closedata {
2179 struct inode *inode;
2180 struct nfs4_state *state;
2181 struct nfs_closeargs arg;
2182 struct nfs_closeres res;
2183 struct nfs_fattr fattr;
2184 unsigned long timestamp;
2185 bool roc;
2186 u32 roc_barrier;
2187};
2188
2189static void nfs4_free_closedata(void *data)
2190{
2191 struct nfs4_closedata *calldata = data;
2192 struct nfs4_state_owner *sp = calldata->state->owner;
2193 struct super_block *sb = calldata->state->inode->i_sb;
2194
2195 if (calldata->roc)
2196 pnfs_roc_release(calldata->state->inode);
2197 nfs4_put_open_state(calldata->state);
2198 nfs_free_seqid(calldata->arg.seqid);
2199 nfs4_put_state_owner(sp);
2200 nfs_sb_deactive_async(sb);
2201 kfree(calldata);
2202}
2203
2204static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2205 fmode_t fmode)
2206{
2207 spin_lock(&state->owner->so_lock);
2208 if (!(fmode & FMODE_READ))
2209 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2210 if (!(fmode & FMODE_WRITE))
2211 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2212 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2213 spin_unlock(&state->owner->so_lock);
2214}
2215
2216static void nfs4_close_done(struct rpc_task *task, void *data)
2217{
2218 struct nfs4_closedata *calldata = data;
2219 struct nfs4_state *state = calldata->state;
2220 struct nfs_server *server = NFS_SERVER(calldata->inode);
2221
2222 dprintk("%s: begin!\n", __func__);
2223 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2224 return;
2225 /* hmm. we are done with the inode, and in the process of freeing
2226 * the state_owner. we keep this around to process errors
2227 */
2228 switch (task->tk_status) {
2229 case 0:
2230 if (calldata->roc)
2231 pnfs_roc_set_barrier(state->inode,
2232 calldata->roc_barrier);
2233 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2234 renew_lease(server, calldata->timestamp);
2235 nfs4_close_clear_stateid_flags(state,
2236 calldata->arg.fmode);
2237 break;
2238 case -NFS4ERR_STALE_STATEID:
2239 case -NFS4ERR_OLD_STATEID:
2240 case -NFS4ERR_BAD_STATEID:
2241 case -NFS4ERR_EXPIRED:
2242 if (calldata->arg.fmode == 0)
2243 break;
2244 default:
2245 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2246 rpc_restart_call_prepare(task);
2247 }
2248 nfs_release_seqid(calldata->arg.seqid);
2249 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2250 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2251}
2252
2253static void nfs4_close_prepare(struct rpc_task *task, void *data)
2254{
2255 struct nfs4_closedata *calldata = data;
2256 struct nfs4_state *state = calldata->state;
2257 struct inode *inode = calldata->inode;
2258 int call_close = 0;
2259
2260 dprintk("%s: begin!\n", __func__);
2261 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2262 return;
2263
2264 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2265 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2266 spin_lock(&state->owner->so_lock);
2267 /* Calculate the change in open mode */
2268 if (state->n_rdwr == 0) {
2269 if (state->n_rdonly == 0) {
2270 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2271 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2272 calldata->arg.fmode &= ~FMODE_READ;
2273 }
2274 if (state->n_wronly == 0) {
2275 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2276 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2277 calldata->arg.fmode &= ~FMODE_WRITE;
2278 }
2279 }
2280 spin_unlock(&state->owner->so_lock);
2281
2282 if (!call_close) {
2283 /* Note: exit _without_ calling nfs4_close_done */
2284 task->tk_action = NULL;
2285 goto out;
2286 }
2287
2288 if (calldata->arg.fmode == 0) {
2289 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2290 if (calldata->roc &&
2291 pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2292 goto out;
2293 }
2294
2295 nfs_fattr_init(calldata->res.fattr);
2296 calldata->timestamp = jiffies;
2297 if (nfs4_setup_sequence(NFS_SERVER(inode),
2298 &calldata->arg.seq_args,
2299 &calldata->res.seq_res,
2300 task) != 0)
2301 nfs_release_seqid(calldata->arg.seqid);
2302 else
2303 rpc_call_start(task);
2304out:
2305 dprintk("%s: done!\n", __func__);
2306}
2307
2308static const struct rpc_call_ops nfs4_close_ops = {
2309 .rpc_call_prepare = nfs4_close_prepare,
2310 .rpc_call_done = nfs4_close_done,
2311 .rpc_release = nfs4_free_closedata,
2312};
2313
2314/*
2315 * It is possible for data to be read/written from a mem-mapped file
2316 * after the sys_close call (which hits the vfs layer as a flush).
2317 * This means that we can't safely call nfsv4 close on a file until
2318 * the inode is cleared. This in turn means that we are not good
2319 * NFSv4 citizens - we do not indicate to the server to update the file's
2320 * share state even when we are done with one of the three share
2321 * stateid's in the inode.
2322 *
2323 * NOTE: Caller must be holding the sp->so_owner semaphore!
2324 */
2325int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2326{
2327 struct nfs_server *server = NFS_SERVER(state->inode);
2328 struct nfs4_closedata *calldata;
2329 struct nfs4_state_owner *sp = state->owner;
2330 struct rpc_task *task;
2331 struct rpc_message msg = {
2332 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2333 .rpc_cred = state->owner->so_cred,
2334 };
2335 struct rpc_task_setup task_setup_data = {
2336 .rpc_client = server->client,
2337 .rpc_message = &msg,
2338 .callback_ops = &nfs4_close_ops,
2339 .workqueue = nfsiod_workqueue,
2340 .flags = RPC_TASK_ASYNC,
2341 };
2342 int status = -ENOMEM;
2343
2344 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2345 if (calldata == NULL)
2346 goto out;
2347 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2348 calldata->inode = state->inode;
2349 calldata->state = state;
2350 calldata->arg.fh = NFS_FH(state->inode);
2351 calldata->arg.stateid = &state->open_stateid;
2352 /* Serialization for the sequence id */
2353 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2354 if (calldata->arg.seqid == NULL)
2355 goto out_free_calldata;
2356 calldata->arg.fmode = 0;
2357 calldata->arg.bitmask = server->cache_consistency_bitmask;
2358 calldata->res.fattr = &calldata->fattr;
2359 calldata->res.seqid = calldata->arg.seqid;
2360 calldata->res.server = server;
2361 calldata->roc = pnfs_roc(state->inode);
2362 nfs_sb_active(calldata->inode->i_sb);
2363
2364 msg.rpc_argp = &calldata->arg;
2365 msg.rpc_resp = &calldata->res;
2366 task_setup_data.callback_data = calldata;
2367 task = rpc_run_task(&task_setup_data);
2368 if (IS_ERR(task))
2369 return PTR_ERR(task);
2370 status = 0;
2371 if (wait)
2372 status = rpc_wait_for_completion_task(task);
2373 rpc_put_task(task);
2374 return status;
2375out_free_calldata:
2376 kfree(calldata);
2377out:
2378 nfs4_put_open_state(state);
2379 nfs4_put_state_owner(sp);
2380 return status;
2381}
2382
2383static struct inode *
2384nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2385{
2386 struct nfs4_state *state;
2387
2388 /* Protect against concurrent sillydeletes */
2389 state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2390 ctx->cred, &ctx->mdsthreshold);
2391 if (IS_ERR(state))
2392 return ERR_CAST(state);
2393 ctx->state = state;
2394 return igrab(state->inode);
2395}
2396
2397static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2398{
2399 if (ctx->state == NULL)
2400 return;
2401 if (is_sync)
2402 nfs4_close_sync(ctx->state, ctx->mode);
2403 else
2404 nfs4_close_state(ctx->state, ctx->mode);
2405}
2406
2407static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2408{
2409 struct nfs4_server_caps_arg args = {
2410 .fhandle = fhandle,
2411 };
2412 struct nfs4_server_caps_res res = {};
2413 struct rpc_message msg = {
2414 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2415 .rpc_argp = &args,
2416 .rpc_resp = &res,
2417 };
2418 int status;
2419
2420 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2421 if (status == 0) {
2422 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2423 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2424 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2425 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2426 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2427 NFS_CAP_CTIME|NFS_CAP_MTIME);
2428 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2429 server->caps |= NFS_CAP_ACLS;
2430 if (res.has_links != 0)
2431 server->caps |= NFS_CAP_HARDLINKS;
2432 if (res.has_symlinks != 0)
2433 server->caps |= NFS_CAP_SYMLINKS;
2434 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2435 server->caps |= NFS_CAP_FILEID;
2436 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2437 server->caps |= NFS_CAP_MODE;
2438 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2439 server->caps |= NFS_CAP_NLINK;
2440 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2441 server->caps |= NFS_CAP_OWNER;
2442 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2443 server->caps |= NFS_CAP_OWNER_GROUP;
2444 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2445 server->caps |= NFS_CAP_ATIME;
2446 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2447 server->caps |= NFS_CAP_CTIME;
2448 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2449 server->caps |= NFS_CAP_MTIME;
2450
2451 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2452 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2453 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2454 server->acl_bitmask = res.acl_bitmask;
2455 server->fh_expire_type = res.fh_expire_type;
2456 }
2457
2458 return status;
2459}
2460
2461int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2462{
2463 struct nfs4_exception exception = { };
2464 int err;
2465 do {
2466 err = nfs4_handle_exception(server,
2467 _nfs4_server_capabilities(server, fhandle),
2468 &exception);
2469 } while (exception.retry);
2470 return err;
2471}
2472
2473static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2474 struct nfs_fsinfo *info)
2475{
2476 struct nfs4_lookup_root_arg args = {
2477 .bitmask = nfs4_fattr_bitmap,
2478 };
2479 struct nfs4_lookup_res res = {
2480 .server = server,
2481 .fattr = info->fattr,
2482 .fh = fhandle,
2483 };
2484 struct rpc_message msg = {
2485 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2486 .rpc_argp = &args,
2487 .rpc_resp = &res,
2488 };
2489
2490 nfs_fattr_init(info->fattr);
2491 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2492}
2493
2494static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2495 struct nfs_fsinfo *info)
2496{
2497 struct nfs4_exception exception = { };
2498 int err;
2499 do {
2500 err = _nfs4_lookup_root(server, fhandle, info);
2501 switch (err) {
2502 case 0:
2503 case -NFS4ERR_WRONGSEC:
2504 goto out;
2505 default:
2506 err = nfs4_handle_exception(server, err, &exception);
2507 }
2508 } while (exception.retry);
2509out:
2510 return err;
2511}
2512
2513static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2514 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2515{
2516 struct rpc_auth *auth;
2517 int ret;
2518
2519 auth = rpcauth_create(flavor, server->client);
2520 if (IS_ERR(auth)) {
2521 ret = -EIO;
2522 goto out;
2523 }
2524 ret = nfs4_lookup_root(server, fhandle, info);
2525out:
2526 return ret;
2527}
2528
2529static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2530 struct nfs_fsinfo *info)
2531{
2532 int i, len, status = 0;
2533 rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2534
2535 len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2536 BUG_ON(len < 0);
2537
2538 for (i = 0; i < len; i++) {
2539 /* AUTH_UNIX is the default flavor if none was specified,
2540 * thus has already been tried. */
2541 if (flav_array[i] == RPC_AUTH_UNIX)
2542 continue;
2543
2544 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2545 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2546 continue;
2547 break;
2548 }
2549 /*
2550 * -EACCESS could mean that the user doesn't have correct permissions
2551 * to access the mount. It could also mean that we tried to mount
2552 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2553 * existing mount programs don't handle -EACCES very well so it should
2554 * be mapped to -EPERM instead.
2555 */
2556 if (status == -EACCES)
2557 status = -EPERM;
2558 return status;
2559}
2560
2561/*
2562 * get the file handle for the "/" directory on the server
2563 */
2564int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2565 struct nfs_fsinfo *info)
2566{
2567 int minor_version = server->nfs_client->cl_minorversion;
2568 int status = nfs4_lookup_root(server, fhandle, info);
2569 if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2570 /*
2571 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2572 * by nfs4_map_errors() as this function exits.
2573 */
2574 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2575 if (status == 0)
2576 status = nfs4_server_capabilities(server, fhandle);
2577 if (status == 0)
2578 status = nfs4_do_fsinfo(server, fhandle, info);
2579 return nfs4_map_errors(status);
2580}
2581
2582static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2583 struct nfs_fsinfo *info)
2584{
2585 int error;
2586 struct nfs_fattr *fattr = info->fattr;
2587
2588 error = nfs4_server_capabilities(server, mntfh);
2589 if (error < 0) {
2590 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2591 return error;
2592 }
2593
2594 error = nfs4_proc_getattr(server, mntfh, fattr);
2595 if (error < 0) {
2596 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2597 return error;
2598 }
2599
2600 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2601 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2602 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2603
2604 return error;
2605}
2606
2607/*
2608 * Get locations and (maybe) other attributes of a referral.
2609 * Note that we'll actually follow the referral later when
2610 * we detect fsid mismatch in inode revalidation
2611 */
2612static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2613 const struct qstr *name, struct nfs_fattr *fattr,
2614 struct nfs_fh *fhandle)
2615{
2616 int status = -ENOMEM;
2617 struct page *page = NULL;
2618 struct nfs4_fs_locations *locations = NULL;
2619
2620 page = alloc_page(GFP_KERNEL);
2621 if (page == NULL)
2622 goto out;
2623 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2624 if (locations == NULL)
2625 goto out;
2626
2627 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2628 if (status != 0)
2629 goto out;
2630 /* Make sure server returned a different fsid for the referral */
2631 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2632 dprintk("%s: server did not return a different fsid for"
2633 " a referral at %s\n", __func__, name->name);
2634 status = -EIO;
2635 goto out;
2636 }
2637 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2638 nfs_fixup_referral_attributes(&locations->fattr);
2639
2640 /* replace the lookup nfs_fattr with the locations nfs_fattr */
2641 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2642 memset(fhandle, 0, sizeof(struct nfs_fh));
2643out:
2644 if (page)
2645 __free_page(page);
2646 kfree(locations);
2647 return status;
2648}
2649
2650static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2651{
2652 struct nfs4_getattr_arg args = {
2653 .fh = fhandle,
2654 .bitmask = server->attr_bitmask,
2655 };
2656 struct nfs4_getattr_res res = {
2657 .fattr = fattr,
2658 .server = server,
2659 };
2660 struct rpc_message msg = {
2661 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2662 .rpc_argp = &args,
2663 .rpc_resp = &res,
2664 };
2665
2666 nfs_fattr_init(fattr);
2667 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2668}
2669
2670static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2671{
2672 struct nfs4_exception exception = { };
2673 int err;
2674 do {
2675 err = nfs4_handle_exception(server,
2676 _nfs4_proc_getattr(server, fhandle, fattr),
2677 &exception);
2678 } while (exception.retry);
2679 return err;
2680}
2681
2682/*
2683 * The file is not closed if it is opened due to the a request to change
2684 * the size of the file. The open call will not be needed once the
2685 * VFS layer lookup-intents are implemented.
2686 *
2687 * Close is called when the inode is destroyed.
2688 * If we haven't opened the file for O_WRONLY, we
2689 * need to in the size_change case to obtain a stateid.
2690 *
2691 * Got race?
2692 * Because OPEN is always done by name in nfsv4, it is
2693 * possible that we opened a different file by the same
2694 * name. We can recognize this race condition, but we
2695 * can't do anything about it besides returning an error.
2696 *
2697 * This will be fixed with VFS changes (lookup-intent).
2698 */
2699static int
2700nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2701 struct iattr *sattr)
2702{
2703 struct inode *inode = dentry->d_inode;
2704 struct rpc_cred *cred = NULL;
2705 struct nfs4_state *state = NULL;
2706 int status;
2707
2708 if (pnfs_ld_layoutret_on_setattr(inode))
2709 pnfs_return_layout(inode);
2710
2711 nfs_fattr_init(fattr);
2712
2713 /* Deal with open(O_TRUNC) */
2714 if (sattr->ia_valid & ATTR_OPEN)
2715 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2716
2717 /* Optimization: if the end result is no change, don't RPC */
2718 if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2719 return 0;
2720
2721 /* Search for an existing open(O_WRITE) file */
2722 if (sattr->ia_valid & ATTR_FILE) {
2723 struct nfs_open_context *ctx;
2724
2725 ctx = nfs_file_open_context(sattr->ia_file);
2726 if (ctx) {
2727 cred = ctx->cred;
2728 state = ctx->state;
2729 }
2730 }
2731
2732 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2733 if (status == 0)
2734 nfs_setattr_update_inode(inode, sattr);
2735 return status;
2736}
2737
2738static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2739 const struct qstr *name, struct nfs_fh *fhandle,
2740 struct nfs_fattr *fattr)
2741{
2742 struct nfs_server *server = NFS_SERVER(dir);
2743 int status;
2744 struct nfs4_lookup_arg args = {
2745 .bitmask = server->attr_bitmask,
2746 .dir_fh = NFS_FH(dir),
2747 .name = name,
2748 };
2749 struct nfs4_lookup_res res = {
2750 .server = server,
2751 .fattr = fattr,
2752 .fh = fhandle,
2753 };
2754 struct rpc_message msg = {
2755 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2756 .rpc_argp = &args,
2757 .rpc_resp = &res,
2758 };
2759
2760 nfs_fattr_init(fattr);
2761
2762 dprintk("NFS call lookup %s\n", name->name);
2763 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2764 dprintk("NFS reply lookup: %d\n", status);
2765 return status;
2766}
2767
2768static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2769{
2770 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2771 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2772 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2773 fattr->nlink = 2;
2774}
2775
2776static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2777 struct qstr *name, struct nfs_fh *fhandle,
2778 struct nfs_fattr *fattr)
2779{
2780 struct nfs4_exception exception = { };
2781 struct rpc_clnt *client = *clnt;
2782 int err;
2783 do {
2784 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2785 switch (err) {
2786 case -NFS4ERR_BADNAME:
2787 err = -ENOENT;
2788 goto out;
2789 case -NFS4ERR_MOVED:
2790 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2791 goto out;
2792 case -NFS4ERR_WRONGSEC:
2793 err = -EPERM;
2794 if (client != *clnt)
2795 goto out;
2796
2797 client = nfs4_create_sec_client(client, dir, name);
2798 if (IS_ERR(client))
2799 return PTR_ERR(client);
2800
2801 exception.retry = 1;
2802 break;
2803 default:
2804 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2805 }
2806 } while (exception.retry);
2807
2808out:
2809 if (err == 0)
2810 *clnt = client;
2811 else if (client != *clnt)
2812 rpc_shutdown_client(client);
2813
2814 return err;
2815}
2816
2817static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2818 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2819{
2820 int status;
2821 struct rpc_clnt *client = NFS_CLIENT(dir);
2822
2823 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2824 if (client != NFS_CLIENT(dir)) {
2825 rpc_shutdown_client(client);
2826 nfs_fixup_secinfo_attributes(fattr);
2827 }
2828 return status;
2829}
2830
2831struct rpc_clnt *
2832nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2833 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2834{
2835 int status;
2836 struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2837
2838 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2839 if (status < 0) {
2840 rpc_shutdown_client(client);
2841 return ERR_PTR(status);
2842 }
2843 return client;
2844}
2845
2846static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2847{
2848 struct nfs_server *server = NFS_SERVER(inode);
2849 struct nfs4_accessargs args = {
2850 .fh = NFS_FH(inode),
2851 .bitmask = server->cache_consistency_bitmask,
2852 };
2853 struct nfs4_accessres res = {
2854 .server = server,
2855 };
2856 struct rpc_message msg = {
2857 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2858 .rpc_argp = &args,
2859 .rpc_resp = &res,
2860 .rpc_cred = entry->cred,
2861 };
2862 int mode = entry->mask;
2863 int status;
2864
2865 /*
2866 * Determine which access bits we want to ask for...
2867 */
2868 if (mode & MAY_READ)
2869 args.access |= NFS4_ACCESS_READ;
2870 if (S_ISDIR(inode->i_mode)) {
2871 if (mode & MAY_WRITE)
2872 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2873 if (mode & MAY_EXEC)
2874 args.access |= NFS4_ACCESS_LOOKUP;
2875 } else {
2876 if (mode & MAY_WRITE)
2877 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2878 if (mode & MAY_EXEC)
2879 args.access |= NFS4_ACCESS_EXECUTE;
2880 }
2881
2882 res.fattr = nfs_alloc_fattr();
2883 if (res.fattr == NULL)
2884 return -ENOMEM;
2885
2886 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2887 if (!status) {
2888 nfs_access_set_mask(entry, res.access);
2889 nfs_refresh_inode(inode, res.fattr);
2890 }
2891 nfs_free_fattr(res.fattr);
2892 return status;
2893}
2894
2895static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2896{
2897 struct nfs4_exception exception = { };
2898 int err;
2899 do {
2900 err = nfs4_handle_exception(NFS_SERVER(inode),
2901 _nfs4_proc_access(inode, entry),
2902 &exception);
2903 } while (exception.retry);
2904 return err;
2905}
2906
2907/*
2908 * TODO: For the time being, we don't try to get any attributes
2909 * along with any of the zero-copy operations READ, READDIR,
2910 * READLINK, WRITE.
2911 *
2912 * In the case of the first three, we want to put the GETATTR
2913 * after the read-type operation -- this is because it is hard
2914 * to predict the length of a GETATTR response in v4, and thus
2915 * align the READ data correctly. This means that the GETATTR
2916 * may end up partially falling into the page cache, and we should
2917 * shift it into the 'tail' of the xdr_buf before processing.
2918 * To do this efficiently, we need to know the total length
2919 * of data received, which doesn't seem to be available outside
2920 * of the RPC layer.
2921 *
2922 * In the case of WRITE, we also want to put the GETATTR after
2923 * the operation -- in this case because we want to make sure
2924 * we get the post-operation mtime and size.
2925 *
2926 * Both of these changes to the XDR layer would in fact be quite
2927 * minor, but I decided to leave them for a subsequent patch.
2928 */
2929static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2930 unsigned int pgbase, unsigned int pglen)
2931{
2932 struct nfs4_readlink args = {
2933 .fh = NFS_FH(inode),
2934 .pgbase = pgbase,
2935 .pglen = pglen,
2936 .pages = &page,
2937 };
2938 struct nfs4_readlink_res res;
2939 struct rpc_message msg = {
2940 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2941 .rpc_argp = &args,
2942 .rpc_resp = &res,
2943 };
2944
2945 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2946}
2947
2948static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2949 unsigned int pgbase, unsigned int pglen)
2950{
2951 struct nfs4_exception exception = { };
2952 int err;
2953 do {
2954 err = nfs4_handle_exception(NFS_SERVER(inode),
2955 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2956 &exception);
2957 } while (exception.retry);
2958 return err;
2959}
2960
2961/*
2962 * This is just for mknod. open(O_CREAT) will always do ->open_context().
2963 */
2964static int
2965nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2966 int flags)
2967{
2968 struct nfs_open_context *ctx;
2969 struct nfs4_state *state;
2970 int status = 0;
2971
2972 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2973 if (IS_ERR(ctx))
2974 return PTR_ERR(ctx);
2975
2976 sattr->ia_mode &= ~current_umask();
2977 state = nfs4_do_open(dir, dentry, ctx->mode,
2978 flags, sattr, ctx->cred,
2979 &ctx->mdsthreshold);
2980 d_drop(dentry);
2981 if (IS_ERR(state)) {
2982 status = PTR_ERR(state);
2983 goto out;
2984 }
2985 d_add(dentry, igrab(state->inode));
2986 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2987 ctx->state = state;
2988out:
2989 put_nfs_open_context(ctx);
2990 return status;
2991}
2992
2993static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2994{
2995 struct nfs_server *server = NFS_SERVER(dir);
2996 struct nfs_removeargs args = {
2997 .fh = NFS_FH(dir),
2998 .name = *name,
2999 };
3000 struct nfs_removeres res = {
3001 .server = server,
3002 };
3003 struct rpc_message msg = {
3004 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3005 .rpc_argp = &args,
3006 .rpc_resp = &res,
3007 };
3008 int status;
3009
3010 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3011 if (status == 0)
3012 update_changeattr(dir, &res.cinfo);
3013 return status;
3014}
3015
3016static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3017{
3018 struct nfs4_exception exception = { };
3019 int err;
3020 do {
3021 err = nfs4_handle_exception(NFS_SERVER(dir),
3022 _nfs4_proc_remove(dir, name),
3023 &exception);
3024 } while (exception.retry);
3025 return err;
3026}
3027
3028static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3029{
3030 struct nfs_server *server = NFS_SERVER(dir);
3031 struct nfs_removeargs *args = msg->rpc_argp;
3032 struct nfs_removeres *res = msg->rpc_resp;
3033
3034 res->server = server;
3035 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3036 nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3037}
3038
3039static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3040{
3041 if (nfs4_setup_sequence(NFS_SERVER(data->dir),
3042 &data->args.seq_args,
3043 &data->res.seq_res,
3044 task))
3045 return;
3046 rpc_call_start(task);
3047}
3048
3049static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3050{
3051 struct nfs_removeres *res = task->tk_msg.rpc_resp;
3052
3053 if (!nfs4_sequence_done(task, &res->seq_res))
3054 return 0;
3055 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3056 return 0;
3057 update_changeattr(dir, &res->cinfo);
3058 return 1;
3059}
3060
3061static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3062{
3063 struct nfs_server *server = NFS_SERVER(dir);
3064 struct nfs_renameargs *arg = msg->rpc_argp;
3065 struct nfs_renameres *res = msg->rpc_resp;
3066
3067 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3068 res->server = server;
3069 nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3070}
3071
3072static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3073{
3074 if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3075 &data->args.seq_args,
3076 &data->res.seq_res,
3077 task))
3078 return;
3079 rpc_call_start(task);
3080}
3081
3082static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3083 struct inode *new_dir)
3084{
3085 struct nfs_renameres *res = task->tk_msg.rpc_resp;
3086
3087 if (!nfs4_sequence_done(task, &res->seq_res))
3088 return 0;
3089 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3090 return 0;
3091
3092 update_changeattr(old_dir, &res->old_cinfo);
3093 update_changeattr(new_dir, &res->new_cinfo);
3094 return 1;
3095}
3096
3097static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3098 struct inode *new_dir, struct qstr *new_name)
3099{
3100 struct nfs_server *server = NFS_SERVER(old_dir);
3101 struct nfs_renameargs arg = {
3102 .old_dir = NFS_FH(old_dir),
3103 .new_dir = NFS_FH(new_dir),
3104 .old_name = old_name,
3105 .new_name = new_name,
3106 };
3107 struct nfs_renameres res = {
3108 .server = server,
3109 };
3110 struct rpc_message msg = {
3111 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3112 .rpc_argp = &arg,
3113 .rpc_resp = &res,
3114 };
3115 int status = -ENOMEM;
3116
3117 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3118 if (!status) {
3119 update_changeattr(old_dir, &res.old_cinfo);
3120 update_changeattr(new_dir, &res.new_cinfo);
3121 }
3122 return status;
3123}
3124
3125static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3126 struct inode *new_dir, struct qstr *new_name)
3127{
3128 struct nfs4_exception exception = { };
3129 int err;
3130 do {
3131 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3132 _nfs4_proc_rename(old_dir, old_name,
3133 new_dir, new_name),
3134 &exception);
3135 } while (exception.retry);
3136 return err;
3137}
3138
3139static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3140{
3141 struct nfs_server *server = NFS_SERVER(inode);
3142 struct nfs4_link_arg arg = {
3143 .fh = NFS_FH(inode),
3144 .dir_fh = NFS_FH(dir),
3145 .name = name,
3146 .bitmask = server->attr_bitmask,
3147 };
3148 struct nfs4_link_res res = {
3149 .server = server,
3150 };
3151 struct rpc_message msg = {
3152 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3153 .rpc_argp = &arg,
3154 .rpc_resp = &res,
3155 };
3156 int status = -ENOMEM;
3157
3158 res.fattr = nfs_alloc_fattr();
3159 if (res.fattr == NULL)
3160 goto out;
3161
3162 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3163 if (!status) {
3164 update_changeattr(dir, &res.cinfo);
3165 nfs_post_op_update_inode(inode, res.fattr);
3166 }
3167out:
3168 nfs_free_fattr(res.fattr);
3169 return status;
3170}
3171
3172static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3173{
3174 struct nfs4_exception exception = { };
3175 int err;
3176 do {
3177 err = nfs4_handle_exception(NFS_SERVER(inode),
3178 _nfs4_proc_link(inode, dir, name),
3179 &exception);
3180 } while (exception.retry);
3181 return err;
3182}
3183
3184struct nfs4_createdata {
3185 struct rpc_message msg;
3186 struct nfs4_create_arg arg;
3187 struct nfs4_create_res res;
3188 struct nfs_fh fh;
3189 struct nfs_fattr fattr;
3190};
3191
3192static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3193 struct qstr *name, struct iattr *sattr, u32 ftype)
3194{
3195 struct nfs4_createdata *data;
3196
3197 data = kzalloc(sizeof(*data), GFP_KERNEL);
3198 if (data != NULL) {
3199 struct nfs_server *server = NFS_SERVER(dir);
3200
3201 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3202 data->msg.rpc_argp = &data->arg;
3203 data->msg.rpc_resp = &data->res;
3204 data->arg.dir_fh = NFS_FH(dir);
3205 data->arg.server = server;
3206 data->arg.name = name;
3207 data->arg.attrs = sattr;
3208 data->arg.ftype = ftype;
3209 data->arg.bitmask = server->attr_bitmask;
3210 data->res.server = server;
3211 data->res.fh = &data->fh;
3212 data->res.fattr = &data->fattr;
3213 nfs_fattr_init(data->res.fattr);
3214 }
3215 return data;
3216}
3217
3218static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3219{
3220 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3221 &data->arg.seq_args, &data->res.seq_res, 1);
3222 if (status == 0) {
3223 update_changeattr(dir, &data->res.dir_cinfo);
3224 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3225 }
3226 return status;
3227}
3228
3229static void nfs4_free_createdata(struct nfs4_createdata *data)
3230{
3231 kfree(data);
3232}
3233
3234static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3235 struct page *page, unsigned int len, struct iattr *sattr)
3236{
3237 struct nfs4_createdata *data;
3238 int status = -ENAMETOOLONG;
3239
3240 if (len > NFS4_MAXPATHLEN)
3241 goto out;
3242
3243 status = -ENOMEM;
3244 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3245 if (data == NULL)
3246 goto out;
3247
3248 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3249 data->arg.u.symlink.pages = &page;
3250 data->arg.u.symlink.len = len;
3251
3252 status = nfs4_do_create(dir, dentry, data);
3253
3254 nfs4_free_createdata(data);
3255out:
3256 return status;
3257}
3258
3259static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3260 struct page *page, unsigned int len, struct iattr *sattr)
3261{
3262 struct nfs4_exception exception = { };
3263 int err;
3264 do {
3265 err = nfs4_handle_exception(NFS_SERVER(dir),
3266 _nfs4_proc_symlink(dir, dentry, page,
3267 len, sattr),
3268 &exception);
3269 } while (exception.retry);
3270 return err;
3271}
3272
3273static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3274 struct iattr *sattr)
3275{
3276 struct nfs4_createdata *data;
3277 int status = -ENOMEM;
3278
3279 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3280 if (data == NULL)
3281 goto out;
3282
3283 status = nfs4_do_create(dir, dentry, data);
3284
3285 nfs4_free_createdata(data);
3286out:
3287 return status;
3288}
3289
3290static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3291 struct iattr *sattr)
3292{
3293 struct nfs4_exception exception = { };
3294 int err;
3295
3296 sattr->ia_mode &= ~current_umask();
3297 do {
3298 err = nfs4_handle_exception(NFS_SERVER(dir),
3299 _nfs4_proc_mkdir(dir, dentry, sattr),
3300 &exception);
3301 } while (exception.retry);
3302 return err;
3303}
3304
3305static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3306 u64 cookie, struct page **pages, unsigned int count, int plus)
3307{
3308 struct inode *dir = dentry->d_inode;
3309 struct nfs4_readdir_arg args = {
3310 .fh = NFS_FH(dir),
3311 .pages = pages,
3312 .pgbase = 0,
3313 .count = count,
3314 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3315 .plus = plus,
3316 };
3317 struct nfs4_readdir_res res;
3318 struct rpc_message msg = {
3319 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3320 .rpc_argp = &args,
3321 .rpc_resp = &res,
3322 .rpc_cred = cred,
3323 };
3324 int status;
3325
3326 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3327 dentry->d_parent->d_name.name,
3328 dentry->d_name.name,
3329 (unsigned long long)cookie);
3330 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3331 res.pgbase = args.pgbase;
3332 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3333 if (status >= 0) {
3334 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3335 status += args.pgbase;
3336 }
3337
3338 nfs_invalidate_atime(dir);
3339
3340 dprintk("%s: returns %d\n", __func__, status);
3341 return status;
3342}
3343
3344static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3345 u64 cookie, struct page **pages, unsigned int count, int plus)
3346{
3347 struct nfs4_exception exception = { };
3348 int err;
3349 do {
3350 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3351 _nfs4_proc_readdir(dentry, cred, cookie,
3352 pages, count, plus),
3353 &exception);
3354 } while (exception.retry);
3355 return err;
3356}
3357
3358static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3359 struct iattr *sattr, dev_t rdev)
3360{
3361 struct nfs4_createdata *data;
3362 int mode = sattr->ia_mode;
3363 int status = -ENOMEM;
3364
3365 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3366 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3367
3368 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3369 if (data == NULL)
3370 goto out;
3371
3372 if (S_ISFIFO(mode))
3373 data->arg.ftype = NF4FIFO;
3374 else if (S_ISBLK(mode)) {
3375 data->arg.ftype = NF4BLK;
3376 data->arg.u.device.specdata1 = MAJOR(rdev);
3377 data->arg.u.device.specdata2 = MINOR(rdev);
3378 }
3379 else if (S_ISCHR(mode)) {
3380 data->arg.ftype = NF4CHR;
3381 data->arg.u.device.specdata1 = MAJOR(rdev);
3382 data->arg.u.device.specdata2 = MINOR(rdev);
3383 }
3384
3385 status = nfs4_do_create(dir, dentry, data);
3386
3387 nfs4_free_createdata(data);
3388out:
3389 return status;
3390}
3391
3392static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3393 struct iattr *sattr, dev_t rdev)
3394{
3395 struct nfs4_exception exception = { };
3396 int err;
3397
3398 sattr->ia_mode &= ~current_umask();
3399 do {
3400 err = nfs4_handle_exception(NFS_SERVER(dir),
3401 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3402 &exception);
3403 } while (exception.retry);
3404 return err;
3405}
3406
3407static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3408 struct nfs_fsstat *fsstat)
3409{
3410 struct nfs4_statfs_arg args = {
3411 .fh = fhandle,
3412 .bitmask = server->attr_bitmask,
3413 };
3414 struct nfs4_statfs_res res = {
3415 .fsstat = fsstat,
3416 };
3417 struct rpc_message msg = {
3418 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3419 .rpc_argp = &args,
3420 .rpc_resp = &res,
3421 };
3422
3423 nfs_fattr_init(fsstat->fattr);
3424 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3425}
3426
3427static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3428{
3429 struct nfs4_exception exception = { };
3430 int err;
3431 do {
3432 err = nfs4_handle_exception(server,
3433 _nfs4_proc_statfs(server, fhandle, fsstat),
3434 &exception);
3435 } while (exception.retry);
3436 return err;
3437}
3438
3439static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3440 struct nfs_fsinfo *fsinfo)
3441{
3442 struct nfs4_fsinfo_arg args = {
3443 .fh = fhandle,
3444 .bitmask = server->attr_bitmask,
3445 };
3446 struct nfs4_fsinfo_res res = {
3447 .fsinfo = fsinfo,
3448 };
3449 struct rpc_message msg = {
3450 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3451 .rpc_argp = &args,
3452 .rpc_resp = &res,
3453 };
3454
3455 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3456}
3457
3458static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3459{
3460 struct nfs4_exception exception = { };
3461 int err;
3462
3463 do {
3464 err = nfs4_handle_exception(server,
3465 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3466 &exception);
3467 } while (exception.retry);
3468 return err;
3469}
3470
3471static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3472{
3473 int error;
3474
3475 nfs_fattr_init(fsinfo->fattr);
3476 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3477 if (error == 0) {
3478 /* block layout checks this! */
3479 server->pnfs_blksize = fsinfo->blksize;
3480 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3481 }
3482
3483 return error;
3484}
3485
3486static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3487 struct nfs_pathconf *pathconf)
3488{
3489 struct nfs4_pathconf_arg args = {
3490 .fh = fhandle,
3491 .bitmask = server->attr_bitmask,
3492 };
3493 struct nfs4_pathconf_res res = {
3494 .pathconf = pathconf,
3495 };
3496 struct rpc_message msg = {
3497 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3498 .rpc_argp = &args,
3499 .rpc_resp = &res,
3500 };
3501
3502 /* None of the pathconf attributes are mandatory to implement */
3503 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3504 memset(pathconf, 0, sizeof(*pathconf));
3505 return 0;
3506 }
3507
3508 nfs_fattr_init(pathconf->fattr);
3509 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3510}
3511
3512static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3513 struct nfs_pathconf *pathconf)
3514{
3515 struct nfs4_exception exception = { };
3516 int err;
3517
3518 do {
3519 err = nfs4_handle_exception(server,
3520 _nfs4_proc_pathconf(server, fhandle, pathconf),
3521 &exception);
3522 } while (exception.retry);
3523 return err;
3524}
3525
3526void __nfs4_read_done_cb(struct nfs_read_data *data)
3527{
3528 nfs_invalidate_atime(data->header->inode);
3529}
3530
3531static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3532{
3533 struct nfs_server *server = NFS_SERVER(data->header->inode);
3534
3535 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3536 rpc_restart_call_prepare(task);
3537 return -EAGAIN;
3538 }
3539
3540 __nfs4_read_done_cb(data);
3541 if (task->tk_status > 0)
3542 renew_lease(server, data->timestamp);
3543 return 0;
3544}
3545
3546static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3547{
3548
3549 dprintk("--> %s\n", __func__);
3550
3551 if (!nfs4_sequence_done(task, &data->res.seq_res))
3552 return -EAGAIN;
3553
3554 return data->read_done_cb ? data->read_done_cb(task, data) :
3555 nfs4_read_done_cb(task, data);
3556}
3557
3558static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3559{
3560 data->timestamp = jiffies;
3561 data->read_done_cb = nfs4_read_done_cb;
3562 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3563 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3564}
3565
3566static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3567{
3568 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3569 &data->args.seq_args,
3570 &data->res.seq_res,
3571 task))
3572 return;
3573 rpc_call_start(task);
3574}
3575
3576static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3577{
3578 struct inode *inode = data->header->inode;
3579
3580 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3581 rpc_restart_call_prepare(task);
3582 return -EAGAIN;
3583 }
3584 if (task->tk_status >= 0) {
3585 renew_lease(NFS_SERVER(inode), data->timestamp);
3586 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3587 }
3588 return 0;
3589}
3590
3591static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3592{
3593 if (!nfs4_sequence_done(task, &data->res.seq_res))
3594 return -EAGAIN;
3595 return data->write_done_cb ? data->write_done_cb(task, data) :
3596 nfs4_write_done_cb(task, data);
3597}
3598
3599static
3600bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3601{
3602 const struct nfs_pgio_header *hdr = data->header;
3603
3604 /* Don't request attributes for pNFS or O_DIRECT writes */
3605 if (data->ds_clp != NULL || hdr->dreq != NULL)
3606 return false;
3607 /* Otherwise, request attributes if and only if we don't hold
3608 * a delegation
3609 */
3610 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3611}
3612
3613static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3614{
3615 struct nfs_server *server = NFS_SERVER(data->header->inode);
3616
3617 if (!nfs4_write_need_cache_consistency_data(data)) {
3618 data->args.bitmask = NULL;
3619 data->res.fattr = NULL;
3620 } else
3621 data->args.bitmask = server->cache_consistency_bitmask;
3622
3623 if (!data->write_done_cb)
3624 data->write_done_cb = nfs4_write_done_cb;
3625 data->res.server = server;
3626 data->timestamp = jiffies;
3627
3628 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3629 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3630}
3631
3632static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3633{
3634 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3635 &data->args.seq_args,
3636 &data->res.seq_res,
3637 task))
3638 return;
3639 rpc_call_start(task);
3640}
3641
3642static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3643{
3644 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3645 &data->args.seq_args,
3646 &data->res.seq_res,
3647 task))
3648 return;
3649 rpc_call_start(task);
3650}
3651
3652static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3653{
3654 struct inode *inode = data->inode;
3655
3656 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3657 rpc_restart_call_prepare(task);
3658 return -EAGAIN;
3659 }
3660 return 0;
3661}
3662
3663static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3664{
3665 if (!nfs4_sequence_done(task, &data->res.seq_res))
3666 return -EAGAIN;
3667 return data->commit_done_cb(task, data);
3668}
3669
3670static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3671{
3672 struct nfs_server *server = NFS_SERVER(data->inode);
3673
3674 if (data->commit_done_cb == NULL)
3675 data->commit_done_cb = nfs4_commit_done_cb;
3676 data->res.server = server;
3677 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3678 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3679}
3680
3681struct nfs4_renewdata {
3682 struct nfs_client *client;
3683 unsigned long timestamp;
3684};
3685
3686/*
3687 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3688 * standalone procedure for queueing an asynchronous RENEW.
3689 */
3690static void nfs4_renew_release(void *calldata)
3691{
3692 struct nfs4_renewdata *data = calldata;
3693 struct nfs_client *clp = data->client;
3694
3695 if (atomic_read(&clp->cl_count) > 1)
3696 nfs4_schedule_state_renewal(clp);
3697 nfs_put_client(clp);
3698 kfree(data);
3699}
3700
3701static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3702{
3703 struct nfs4_renewdata *data = calldata;
3704 struct nfs_client *clp = data->client;
3705 unsigned long timestamp = data->timestamp;
3706
3707 if (task->tk_status < 0) {
3708 /* Unless we're shutting down, schedule state recovery! */
3709 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3710 return;
3711 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3712 nfs4_schedule_lease_recovery(clp);
3713 return;
3714 }
3715 nfs4_schedule_path_down_recovery(clp);
3716 }
3717 do_renew_lease(clp, timestamp);
3718}
3719
3720static const struct rpc_call_ops nfs4_renew_ops = {
3721 .rpc_call_done = nfs4_renew_done,
3722 .rpc_release = nfs4_renew_release,
3723};
3724
3725static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3726{
3727 struct rpc_message msg = {
3728 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3729 .rpc_argp = clp,
3730 .rpc_cred = cred,
3731 };
3732 struct nfs4_renewdata *data;
3733
3734 if (renew_flags == 0)
3735 return 0;
3736 if (!atomic_inc_not_zero(&clp->cl_count))
3737 return -EIO;
3738 data = kmalloc(sizeof(*data), GFP_NOFS);
3739 if (data == NULL)
3740 return -ENOMEM;
3741 data->client = clp;
3742 data->timestamp = jiffies;
3743 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3744 &nfs4_renew_ops, data);
3745}
3746
3747static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3748{
3749 struct rpc_message msg = {
3750 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3751 .rpc_argp = clp,
3752 .rpc_cred = cred,
3753 };
3754 unsigned long now = jiffies;
3755 int status;
3756
3757 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3758 if (status < 0)
3759 return status;
3760 do_renew_lease(clp, now);
3761 return 0;
3762}
3763
3764static inline int nfs4_server_supports_acls(struct nfs_server *server)
3765{
3766 return (server->caps & NFS_CAP_ACLS)
3767 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3768 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3769}
3770
3771/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3772 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3773 * the stack.
3774 */
3775#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3776
3777static int buf_to_pages_noslab(const void *buf, size_t buflen,
3778 struct page **pages, unsigned int *pgbase)
3779{
3780 struct page *newpage, **spages;
3781 int rc = 0;
3782 size_t len;
3783 spages = pages;
3784
3785 do {
3786 len = min_t(size_t, PAGE_SIZE, buflen);
3787 newpage = alloc_page(GFP_KERNEL);
3788
3789 if (newpage == NULL)
3790 goto unwind;
3791 memcpy(page_address(newpage), buf, len);
3792 buf += len;
3793 buflen -= len;
3794 *pages++ = newpage;
3795 rc++;
3796 } while (buflen != 0);
3797
3798 return rc;
3799
3800unwind:
3801 for(; rc > 0; rc--)
3802 __free_page(spages[rc-1]);
3803 return -ENOMEM;
3804}
3805
3806struct nfs4_cached_acl {
3807 int cached;
3808 size_t len;
3809 char data[0];
3810};
3811
3812static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3813{
3814 struct nfs_inode *nfsi = NFS_I(inode);
3815
3816 spin_lock(&inode->i_lock);
3817 kfree(nfsi->nfs4_acl);
3818 nfsi->nfs4_acl = acl;
3819 spin_unlock(&inode->i_lock);
3820}
3821
3822static void nfs4_zap_acl_attr(struct inode *inode)
3823{
3824 nfs4_set_cached_acl(inode, NULL);
3825}
3826
3827static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3828{
3829 struct nfs_inode *nfsi = NFS_I(inode);
3830 struct nfs4_cached_acl *acl;
3831 int ret = -ENOENT;
3832
3833 spin_lock(&inode->i_lock);
3834 acl = nfsi->nfs4_acl;
3835 if (acl == NULL)
3836 goto out;
3837 if (buf == NULL) /* user is just asking for length */
3838 goto out_len;
3839 if (acl->cached == 0)
3840 goto out;
3841 ret = -ERANGE; /* see getxattr(2) man page */
3842 if (acl->len > buflen)
3843 goto out;
3844 memcpy(buf, acl->data, acl->len);
3845out_len:
3846 ret = acl->len;
3847out:
3848 spin_unlock(&inode->i_lock);
3849 return ret;
3850}
3851
3852static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3853{
3854 struct nfs4_cached_acl *acl;
3855 size_t buflen = sizeof(*acl) + acl_len;
3856
3857 if (buflen <= PAGE_SIZE) {
3858 acl = kmalloc(buflen, GFP_KERNEL);
3859 if (acl == NULL)
3860 goto out;
3861 acl->cached = 1;
3862 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3863 } else {
3864 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3865 if (acl == NULL)
3866 goto out;
3867 acl->cached = 0;
3868 }
3869 acl->len = acl_len;
3870out:
3871 nfs4_set_cached_acl(inode, acl);
3872}
3873
3874/*
3875 * The getxattr API returns the required buffer length when called with a
3876 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3877 * the required buf. On a NULL buf, we send a page of data to the server
3878 * guessing that the ACL request can be serviced by a page. If so, we cache
3879 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3880 * the cache. If not so, we throw away the page, and cache the required
3881 * length. The next getxattr call will then produce another round trip to
3882 * the server, this time with the input buf of the required size.
3883 */
3884static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3885{
3886 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3887 struct nfs_getaclargs args = {
3888 .fh = NFS_FH(inode),
3889 .acl_pages = pages,
3890 .acl_len = buflen,
3891 };
3892 struct nfs_getaclres res = {
3893 .acl_len = buflen,
3894 };
3895 struct rpc_message msg = {
3896 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3897 .rpc_argp = &args,
3898 .rpc_resp = &res,
3899 };
3900 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3901 int ret = -ENOMEM, i;
3902
3903 /* As long as we're doing a round trip to the server anyway,
3904 * let's be prepared for a page of acl data. */
3905 if (npages == 0)
3906 npages = 1;
3907 if (npages > ARRAY_SIZE(pages))
3908 return -ERANGE;
3909
3910 for (i = 0; i < npages; i++) {
3911 pages[i] = alloc_page(GFP_KERNEL);
3912 if (!pages[i])
3913 goto out_free;
3914 }
3915
3916 /* for decoding across pages */
3917 res.acl_scratch = alloc_page(GFP_KERNEL);
3918 if (!res.acl_scratch)
3919 goto out_free;
3920
3921 args.acl_len = npages * PAGE_SIZE;
3922 args.acl_pgbase = 0;
3923
3924 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
3925 __func__, buf, buflen, npages, args.acl_len);
3926 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3927 &msg, &args.seq_args, &res.seq_res, 0);
3928 if (ret)
3929 goto out_free;
3930
3931 /* Handle the case where the passed-in buffer is too short */
3932 if (res.acl_flags & NFS4_ACL_TRUNC) {
3933 /* Did the user only issue a request for the acl length? */
3934 if (buf == NULL)
3935 goto out_ok;
3936 ret = -ERANGE;
3937 goto out_free;
3938 }
3939 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3940 if (buf)
3941 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3942out_ok:
3943 ret = res.acl_len;
3944out_free:
3945 for (i = 0; i < npages; i++)
3946 if (pages[i])
3947 __free_page(pages[i]);
3948 if (res.acl_scratch)
3949 __free_page(res.acl_scratch);
3950 return ret;
3951}
3952
3953static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3954{
3955 struct nfs4_exception exception = { };
3956 ssize_t ret;
3957 do {
3958 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3959 if (ret >= 0)
3960 break;
3961 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3962 } while (exception.retry);
3963 return ret;
3964}
3965
3966static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3967{
3968 struct nfs_server *server = NFS_SERVER(inode);
3969 int ret;
3970
3971 if (!nfs4_server_supports_acls(server))
3972 return -EOPNOTSUPP;
3973 ret = nfs_revalidate_inode(server, inode);
3974 if (ret < 0)
3975 return ret;
3976 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3977 nfs_zap_acl_cache(inode);
3978 ret = nfs4_read_cached_acl(inode, buf, buflen);
3979 if (ret != -ENOENT)
3980 /* -ENOENT is returned if there is no ACL or if there is an ACL
3981 * but no cached acl data, just the acl length */
3982 return ret;
3983 return nfs4_get_acl_uncached(inode, buf, buflen);
3984}
3985
3986static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3987{
3988 struct nfs_server *server = NFS_SERVER(inode);
3989 struct page *pages[NFS4ACL_MAXPAGES];
3990 struct nfs_setaclargs arg = {
3991 .fh = NFS_FH(inode),
3992 .acl_pages = pages,
3993 .acl_len = buflen,
3994 };
3995 struct nfs_setaclres res;
3996 struct rpc_message msg = {
3997 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3998 .rpc_argp = &arg,
3999 .rpc_resp = &res,
4000 };
4001 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4002 int ret, i;
4003
4004 if (!nfs4_server_supports_acls(server))
4005 return -EOPNOTSUPP;
4006 if (npages > ARRAY_SIZE(pages))
4007 return -ERANGE;
4008 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4009 if (i < 0)
4010 return i;
4011 nfs4_inode_return_delegation(inode);
4012 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4013
4014 /*
4015 * Free each page after tx, so the only ref left is
4016 * held by the network stack
4017 */
4018 for (; i > 0; i--)
4019 put_page(pages[i-1]);
4020
4021 /*
4022 * Acl update can result in inode attribute update.
4023 * so mark the attribute cache invalid.
4024 */
4025 spin_lock(&inode->i_lock);
4026 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4027 spin_unlock(&inode->i_lock);
4028 nfs_access_zap_cache(inode);
4029 nfs_zap_acl_cache(inode);
4030 return ret;
4031}
4032
4033static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4034{
4035 struct nfs4_exception exception = { };
4036 int err;
4037 do {
4038 err = nfs4_handle_exception(NFS_SERVER(inode),
4039 __nfs4_proc_set_acl(inode, buf, buflen),
4040 &exception);
4041 } while (exception.retry);
4042 return err;
4043}
4044
4045static int
4046nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4047{
4048 struct nfs_client *clp = server->nfs_client;
4049
4050 if (task->tk_status >= 0)
4051 return 0;
4052 switch(task->tk_status) {
4053 case -NFS4ERR_DELEG_REVOKED:
4054 case -NFS4ERR_ADMIN_REVOKED:
4055 case -NFS4ERR_BAD_STATEID:
4056 if (state == NULL)
4057 break;
4058 nfs_remove_bad_delegation(state->inode);
4059 case -NFS4ERR_OPENMODE:
4060 if (state == NULL)
4061 break;
4062 nfs4_schedule_stateid_recovery(server, state);
4063 goto wait_on_recovery;
4064 case -NFS4ERR_EXPIRED:
4065 if (state != NULL)
4066 nfs4_schedule_stateid_recovery(server, state);
4067 case -NFS4ERR_STALE_STATEID:
4068 case -NFS4ERR_STALE_CLIENTID:
4069 nfs4_schedule_lease_recovery(clp);
4070 goto wait_on_recovery;
4071#if defined(CONFIG_NFS_V4_1)
4072 case -NFS4ERR_BADSESSION:
4073 case -NFS4ERR_BADSLOT:
4074 case -NFS4ERR_BAD_HIGH_SLOT:
4075 case -NFS4ERR_DEADSESSION:
4076 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4077 case -NFS4ERR_SEQ_FALSE_RETRY:
4078 case -NFS4ERR_SEQ_MISORDERED:
4079 dprintk("%s ERROR %d, Reset session\n", __func__,
4080 task->tk_status);
4081 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4082 task->tk_status = 0;
4083 return -EAGAIN;
4084#endif /* CONFIG_NFS_V4_1 */
4085 case -NFS4ERR_DELAY:
4086 nfs_inc_server_stats(server, NFSIOS_DELAY);
4087 case -NFS4ERR_GRACE:
4088 case -EKEYEXPIRED:
4089 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4090 task->tk_status = 0;
4091 return -EAGAIN;
4092 case -NFS4ERR_RETRY_UNCACHED_REP:
4093 case -NFS4ERR_OLD_STATEID:
4094 task->tk_status = 0;
4095 return -EAGAIN;
4096 }
4097 task->tk_status = nfs4_map_errors(task->tk_status);
4098 return 0;
4099wait_on_recovery:
4100 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4101 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4102 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4103 task->tk_status = 0;
4104 return -EAGAIN;
4105}
4106
4107static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4108 nfs4_verifier *bootverf)
4109{
4110 __be32 verf[2];
4111
4112 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4113 /* An impossible timestamp guarantees this value
4114 * will never match a generated boot time. */
4115 verf[0] = 0;
4116 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4117 } else {
4118 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4119 verf[0] = (__be32)nn->boot_time.tv_sec;
4120 verf[1] = (__be32)nn->boot_time.tv_nsec;
4121 }
4122 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4123}
4124
4125static unsigned int
4126nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4127 char *buf, size_t len)
4128{
4129 unsigned int result;
4130
4131 rcu_read_lock();
4132 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4133 clp->cl_ipaddr,
4134 rpc_peeraddr2str(clp->cl_rpcclient,
4135 RPC_DISPLAY_ADDR),
4136 rpc_peeraddr2str(clp->cl_rpcclient,
4137 RPC_DISPLAY_PROTO));
4138 rcu_read_unlock();
4139 return result;
4140}
4141
4142static unsigned int
4143nfs4_init_uniform_client_string(const struct nfs_client *clp,
4144 char *buf, size_t len)
4145{
4146 char *nodename = clp->cl_rpcclient->cl_nodename;
4147
4148 if (nfs4_client_id_uniquifier[0] != '\0')
4149 nodename = nfs4_client_id_uniquifier;
4150 return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4151 clp->rpc_ops->version, clp->cl_minorversion,
4152 nodename);
4153}
4154
4155/**
4156 * nfs4_proc_setclientid - Negotiate client ID
4157 * @clp: state data structure
4158 * @program: RPC program for NFSv4 callback service
4159 * @port: IP port number for NFS4 callback service
4160 * @cred: RPC credential to use for this call
4161 * @res: where to place the result
4162 *
4163 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4164 */
4165int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4166 unsigned short port, struct rpc_cred *cred,
4167 struct nfs4_setclientid_res *res)
4168{
4169 nfs4_verifier sc_verifier;
4170 struct nfs4_setclientid setclientid = {
4171 .sc_verifier = &sc_verifier,
4172 .sc_prog = program,
4173 .sc_cb_ident = clp->cl_cb_ident,
4174 };
4175 struct rpc_message msg = {
4176 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4177 .rpc_argp = &setclientid,
4178 .rpc_resp = res,
4179 .rpc_cred = cred,
4180 };
4181 int status;
4182
4183 /* nfs_client_id4 */
4184 nfs4_init_boot_verifier(clp, &sc_verifier);
4185 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4186 setclientid.sc_name_len =
4187 nfs4_init_uniform_client_string(clp,
4188 setclientid.sc_name,
4189 sizeof(setclientid.sc_name));
4190 else
4191 setclientid.sc_name_len =
4192 nfs4_init_nonuniform_client_string(clp,
4193 setclientid.sc_name,
4194 sizeof(setclientid.sc_name));
4195 /* cb_client4 */
4196 rcu_read_lock();
4197 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4198 sizeof(setclientid.sc_netid),
4199 rpc_peeraddr2str(clp->cl_rpcclient,
4200 RPC_DISPLAY_NETID));
4201 rcu_read_unlock();
4202 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4203 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4204 clp->cl_ipaddr, port >> 8, port & 255);
4205
4206 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
4207 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4208 setclientid.sc_name_len, setclientid.sc_name);
4209 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4210 dprintk("NFS reply setclientid: %d\n", status);
4211 return status;
4212}
4213
4214/**
4215 * nfs4_proc_setclientid_confirm - Confirm client ID
4216 * @clp: state data structure
4217 * @res: result of a previous SETCLIENTID
4218 * @cred: RPC credential to use for this call
4219 *
4220 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4221 */
4222int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4223 struct nfs4_setclientid_res *arg,
4224 struct rpc_cred *cred)
4225{
4226 struct nfs_fsinfo fsinfo;
4227 struct rpc_message msg = {
4228 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4229 .rpc_argp = arg,
4230 .rpc_resp = &fsinfo,
4231 .rpc_cred = cred,
4232 };
4233 unsigned long now;
4234 int status;
4235
4236 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
4237 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4238 clp->cl_clientid);
4239 now = jiffies;
4240 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4241 if (status == 0) {
4242 spin_lock(&clp->cl_lock);
4243 clp->cl_lease_time = fsinfo.lease_time * HZ;
4244 clp->cl_last_renewal = now;
4245 spin_unlock(&clp->cl_lock);
4246 }
4247 dprintk("NFS reply setclientid_confirm: %d\n", status);
4248 return status;
4249}
4250
4251struct nfs4_delegreturndata {
4252 struct nfs4_delegreturnargs args;
4253 struct nfs4_delegreturnres res;
4254 struct nfs_fh fh;
4255 nfs4_stateid stateid;
4256 unsigned long timestamp;
4257 struct nfs_fattr fattr;
4258 int rpc_status;
4259};
4260
4261static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4262{
4263 struct nfs4_delegreturndata *data = calldata;
4264
4265 if (!nfs4_sequence_done(task, &data->res.seq_res))
4266 return;
4267
4268 switch (task->tk_status) {
4269 case -NFS4ERR_STALE_STATEID:
4270 case -NFS4ERR_EXPIRED:
4271 case 0:
4272 renew_lease(data->res.server, data->timestamp);
4273 break;
4274 default:
4275 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4276 -EAGAIN) {
4277 rpc_restart_call_prepare(task);
4278 return;
4279 }
4280 }
4281 data->rpc_status = task->tk_status;
4282}
4283
4284static void nfs4_delegreturn_release(void *calldata)
4285{
4286 kfree(calldata);
4287}
4288
4289#if defined(CONFIG_NFS_V4_1)
4290static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4291{
4292 struct nfs4_delegreturndata *d_data;
4293
4294 d_data = (struct nfs4_delegreturndata *)data;
4295
4296 if (nfs4_setup_sequence(d_data->res.server,
4297 &d_data->args.seq_args,
4298 &d_data->res.seq_res, task))
4299 return;
4300 rpc_call_start(task);
4301}
4302#endif /* CONFIG_NFS_V4_1 */
4303
4304static const struct rpc_call_ops nfs4_delegreturn_ops = {
4305#if defined(CONFIG_NFS_V4_1)
4306 .rpc_call_prepare = nfs4_delegreturn_prepare,
4307#endif /* CONFIG_NFS_V4_1 */
4308 .rpc_call_done = nfs4_delegreturn_done,
4309 .rpc_release = nfs4_delegreturn_release,
4310};
4311
4312static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4313{
4314 struct nfs4_delegreturndata *data;
4315 struct nfs_server *server = NFS_SERVER(inode);
4316 struct rpc_task *task;
4317 struct rpc_message msg = {
4318 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4319 .rpc_cred = cred,
4320 };
4321 struct rpc_task_setup task_setup_data = {
4322 .rpc_client = server->client,
4323 .rpc_message = &msg,
4324 .callback_ops = &nfs4_delegreturn_ops,
4325 .flags = RPC_TASK_ASYNC,
4326 };
4327 int status = 0;
4328
4329 data = kzalloc(sizeof(*data), GFP_NOFS);
4330 if (data == NULL)
4331 return -ENOMEM;
4332 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4333 data->args.fhandle = &data->fh;
4334 data->args.stateid = &data->stateid;
4335 data->args.bitmask = server->cache_consistency_bitmask;
4336 nfs_copy_fh(&data->fh, NFS_FH(inode));
4337 nfs4_stateid_copy(&data->stateid, stateid);
4338 data->res.fattr = &data->fattr;
4339 data->res.server = server;
4340 nfs_fattr_init(data->res.fattr);
4341 data->timestamp = jiffies;
4342 data->rpc_status = 0;
4343
4344 task_setup_data.callback_data = data;
4345 msg.rpc_argp = &data->args;
4346 msg.rpc_resp = &data->res;
4347 task = rpc_run_task(&task_setup_data);
4348 if (IS_ERR(task))
4349 return PTR_ERR(task);
4350 if (!issync)
4351 goto out;
4352 status = nfs4_wait_for_completion_rpc_task(task);
4353 if (status != 0)
4354 goto out;
4355 status = data->rpc_status;
4356 if (status == 0)
4357 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4358 else
4359 nfs_refresh_inode(inode, &data->fattr);
4360out:
4361 rpc_put_task(task);
4362 return status;
4363}
4364
4365int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4366{
4367 struct nfs_server *server = NFS_SERVER(inode);
4368 struct nfs4_exception exception = { };
4369 int err;
4370 do {
4371 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4372 switch (err) {
4373 case -NFS4ERR_STALE_STATEID:
4374 case -NFS4ERR_EXPIRED:
4375 case 0:
4376 return 0;
4377 }
4378 err = nfs4_handle_exception(server, err, &exception);
4379 } while (exception.retry);
4380 return err;
4381}
4382
4383#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4384#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4385
4386/*
4387 * sleep, with exponential backoff, and retry the LOCK operation.
4388 */
4389static unsigned long
4390nfs4_set_lock_task_retry(unsigned long timeout)
4391{
4392 freezable_schedule_timeout_killable(timeout);
4393 timeout <<= 1;
4394 if (timeout > NFS4_LOCK_MAXTIMEOUT)
4395 return NFS4_LOCK_MAXTIMEOUT;
4396 return timeout;
4397}
4398
4399static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4400{
4401 struct inode *inode = state->inode;
4402 struct nfs_server *server = NFS_SERVER(inode);
4403 struct nfs_client *clp = server->nfs_client;
4404 struct nfs_lockt_args arg = {
4405 .fh = NFS_FH(inode),
4406 .fl = request,
4407 };
4408 struct nfs_lockt_res res = {
4409 .denied = request,
4410 };
4411 struct rpc_message msg = {
4412 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4413 .rpc_argp = &arg,
4414 .rpc_resp = &res,
4415 .rpc_cred = state->owner->so_cred,
4416 };
4417 struct nfs4_lock_state *lsp;
4418 int status;
4419
4420 arg.lock_owner.clientid = clp->cl_clientid;
4421 status = nfs4_set_lock_state(state, request);
4422 if (status != 0)
4423 goto out;
4424 lsp = request->fl_u.nfs4_fl.owner;
4425 arg.lock_owner.id = lsp->ls_seqid.owner_id;
4426 arg.lock_owner.s_dev = server->s_dev;
4427 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4428 switch (status) {
4429 case 0:
4430 request->fl_type = F_UNLCK;
4431 break;
4432 case -NFS4ERR_DENIED:
4433 status = 0;
4434 }
4435 request->fl_ops->fl_release_private(request);
4436out:
4437 return status;
4438}
4439
4440static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4441{
4442 struct nfs4_exception exception = { };
4443 int err;
4444
4445 do {
4446 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4447 _nfs4_proc_getlk(state, cmd, request),
4448 &exception);
4449 } while (exception.retry);
4450 return err;
4451}
4452
4453static int do_vfs_lock(struct file *file, struct file_lock *fl)
4454{
4455 int res = 0;
4456 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4457 case FL_POSIX:
4458 res = posix_lock_file_wait(file, fl);
4459 break;
4460 case FL_FLOCK:
4461 res = flock_lock_file_wait(file, fl);
4462 break;
4463 default:
4464 BUG();
4465 }
4466 return res;
4467}
4468
4469struct nfs4_unlockdata {
4470 struct nfs_locku_args arg;
4471 struct nfs_locku_res res;
4472 struct nfs4_lock_state *lsp;
4473 struct nfs_open_context *ctx;
4474 struct file_lock fl;
4475 const struct nfs_server *server;
4476 unsigned long timestamp;
4477};
4478
4479static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4480 struct nfs_open_context *ctx,
4481 struct nfs4_lock_state *lsp,
4482 struct nfs_seqid *seqid)
4483{
4484 struct nfs4_unlockdata *p;
4485 struct inode *inode = lsp->ls_state->inode;
4486
4487 p = kzalloc(sizeof(*p), GFP_NOFS);
4488 if (p == NULL)
4489 return NULL;
4490 p->arg.fh = NFS_FH(inode);
4491 p->arg.fl = &p->fl;
4492 p->arg.seqid = seqid;
4493 p->res.seqid = seqid;
4494 p->arg.stateid = &lsp->ls_stateid;
4495 p->lsp = lsp;
4496 atomic_inc(&lsp->ls_count);
4497 /* Ensure we don't close file until we're done freeing locks! */
4498 p->ctx = get_nfs_open_context(ctx);
4499 memcpy(&p->fl, fl, sizeof(p->fl));
4500 p->server = NFS_SERVER(inode);
4501 return p;
4502}
4503
4504static void nfs4_locku_release_calldata(void *data)
4505{
4506 struct nfs4_unlockdata *calldata = data;
4507 nfs_free_seqid(calldata->arg.seqid);
4508 nfs4_put_lock_state(calldata->lsp);
4509 put_nfs_open_context(calldata->ctx);
4510 kfree(calldata);
4511}
4512
4513static void nfs4_locku_done(struct rpc_task *task, void *data)
4514{
4515 struct nfs4_unlockdata *calldata = data;
4516
4517 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4518 return;
4519 switch (task->tk_status) {
4520 case 0:
4521 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4522 &calldata->res.stateid);
4523 renew_lease(calldata->server, calldata->timestamp);
4524 break;
4525 case -NFS4ERR_BAD_STATEID:
4526 case -NFS4ERR_OLD_STATEID:
4527 case -NFS4ERR_STALE_STATEID:
4528 case -NFS4ERR_EXPIRED:
4529 break;
4530 default:
4531 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4532 rpc_restart_call_prepare(task);
4533 }
4534 nfs_release_seqid(calldata->arg.seqid);
4535}
4536
4537static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4538{
4539 struct nfs4_unlockdata *calldata = data;
4540
4541 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4542 return;
4543 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4544 /* Note: exit _without_ running nfs4_locku_done */
4545 task->tk_action = NULL;
4546 return;
4547 }
4548 calldata->timestamp = jiffies;
4549 if (nfs4_setup_sequence(calldata->server,
4550 &calldata->arg.seq_args,
4551 &calldata->res.seq_res,
4552 task) != 0)
4553 nfs_release_seqid(calldata->arg.seqid);
4554 else
4555 rpc_call_start(task);
4556}
4557
4558static const struct rpc_call_ops nfs4_locku_ops = {
4559 .rpc_call_prepare = nfs4_locku_prepare,
4560 .rpc_call_done = nfs4_locku_done,
4561 .rpc_release = nfs4_locku_release_calldata,
4562};
4563
4564static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4565 struct nfs_open_context *ctx,
4566 struct nfs4_lock_state *lsp,
4567 struct nfs_seqid *seqid)
4568{
4569 struct nfs4_unlockdata *data;
4570 struct rpc_message msg = {
4571 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4572 .rpc_cred = ctx->cred,
4573 };
4574 struct rpc_task_setup task_setup_data = {
4575 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4576 .rpc_message = &msg,
4577 .callback_ops = &nfs4_locku_ops,
4578 .workqueue = nfsiod_workqueue,
4579 .flags = RPC_TASK_ASYNC,
4580 };
4581
4582 /* Ensure this is an unlock - when canceling a lock, the
4583 * canceled lock is passed in, and it won't be an unlock.
4584 */
4585 fl->fl_type = F_UNLCK;
4586
4587 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4588 if (data == NULL) {
4589 nfs_free_seqid(seqid);
4590 return ERR_PTR(-ENOMEM);
4591 }
4592
4593 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4594 msg.rpc_argp = &data->arg;
4595 msg.rpc_resp = &data->res;
4596 task_setup_data.callback_data = data;
4597 return rpc_run_task(&task_setup_data);
4598}
4599
4600static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4601{
4602 struct nfs_inode *nfsi = NFS_I(state->inode);
4603 struct nfs_seqid *seqid;
4604 struct nfs4_lock_state *lsp;
4605 struct rpc_task *task;
4606 int status = 0;
4607 unsigned char fl_flags = request->fl_flags;
4608
4609 status = nfs4_set_lock_state(state, request);
4610 /* Unlock _before_ we do the RPC call */
4611 request->fl_flags |= FL_EXISTS;
4612 down_read(&nfsi->rwsem);
4613 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4614 up_read(&nfsi->rwsem);
4615 goto out;
4616 }
4617 up_read(&nfsi->rwsem);
4618 if (status != 0)
4619 goto out;
4620 /* Is this a delegated lock? */
4621 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4622 goto out;
4623 lsp = request->fl_u.nfs4_fl.owner;
4624 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4625 status = -ENOMEM;
4626 if (seqid == NULL)
4627 goto out;
4628 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4629 status = PTR_ERR(task);
4630 if (IS_ERR(task))
4631 goto out;
4632 status = nfs4_wait_for_completion_rpc_task(task);
4633 rpc_put_task(task);
4634out:
4635 request->fl_flags = fl_flags;
4636 return status;
4637}
4638
4639struct nfs4_lockdata {
4640 struct nfs_lock_args arg;
4641 struct nfs_lock_res res;
4642 struct nfs4_lock_state *lsp;
4643 struct nfs_open_context *ctx;
4644 struct file_lock fl;
4645 unsigned long timestamp;
4646 int rpc_status;
4647 int cancelled;
4648 struct nfs_server *server;
4649};
4650
4651static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4652 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4653 gfp_t gfp_mask)
4654{
4655 struct nfs4_lockdata *p;
4656 struct inode *inode = lsp->ls_state->inode;
4657 struct nfs_server *server = NFS_SERVER(inode);
4658
4659 p = kzalloc(sizeof(*p), gfp_mask);
4660 if (p == NULL)
4661 return NULL;
4662
4663 p->arg.fh = NFS_FH(inode);
4664 p->arg.fl = &p->fl;
4665 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4666 if (p->arg.open_seqid == NULL)
4667 goto out_free;
4668 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4669 if (p->arg.lock_seqid == NULL)
4670 goto out_free_seqid;
4671 p->arg.lock_stateid = &lsp->ls_stateid;
4672 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4673 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4674 p->arg.lock_owner.s_dev = server->s_dev;
4675 p->res.lock_seqid = p->arg.lock_seqid;
4676 p->lsp = lsp;
4677 p->server = server;
4678 atomic_inc(&lsp->ls_count);
4679 p->ctx = get_nfs_open_context(ctx);
4680 memcpy(&p->fl, fl, sizeof(p->fl));
4681 return p;
4682out_free_seqid:
4683 nfs_free_seqid(p->arg.open_seqid);
4684out_free:
4685 kfree(p);
4686 return NULL;
4687}
4688
4689static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4690{
4691 struct nfs4_lockdata *data = calldata;
4692 struct nfs4_state *state = data->lsp->ls_state;
4693
4694 dprintk("%s: begin!\n", __func__);
4695 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4696 return;
4697 /* Do we need to do an open_to_lock_owner? */
4698 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4699 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4700 goto out_release_lock_seqid;
4701 data->arg.open_stateid = &state->stateid;
4702 data->arg.new_lock_owner = 1;
4703 data->res.open_seqid = data->arg.open_seqid;
4704 } else
4705 data->arg.new_lock_owner = 0;
4706 data->timestamp = jiffies;
4707 if (nfs4_setup_sequence(data->server,
4708 &data->arg.seq_args,
4709 &data->res.seq_res,
4710 task) == 0) {
4711 rpc_call_start(task);
4712 return;
4713 }
4714 nfs_release_seqid(data->arg.open_seqid);
4715out_release_lock_seqid:
4716 nfs_release_seqid(data->arg.lock_seqid);
4717 dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4718}
4719
4720static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4721{
4722 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4723 nfs4_lock_prepare(task, calldata);
4724}
4725
4726static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4727{
4728 struct nfs4_lockdata *data = calldata;
4729
4730 dprintk("%s: begin!\n", __func__);
4731
4732 if (!nfs4_sequence_done(task, &data->res.seq_res))
4733 return;
4734
4735 data->rpc_status = task->tk_status;
4736 if (data->arg.new_lock_owner != 0) {
4737 if (data->rpc_status == 0)
4738 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4739 else
4740 goto out;
4741 }
4742 if (data->rpc_status == 0) {
4743 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4744 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4745 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4746 }
4747out:
4748 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4749}
4750
4751static void nfs4_lock_release(void *calldata)
4752{
4753 struct nfs4_lockdata *data = calldata;
4754
4755 dprintk("%s: begin!\n", __func__);
4756 nfs_free_seqid(data->arg.open_seqid);
4757 if (data->cancelled != 0) {
4758 struct rpc_task *task;
4759 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4760 data->arg.lock_seqid);
4761 if (!IS_ERR(task))
4762 rpc_put_task_async(task);
4763 dprintk("%s: cancelling lock!\n", __func__);
4764 } else
4765 nfs_free_seqid(data->arg.lock_seqid);
4766 nfs4_put_lock_state(data->lsp);
4767 put_nfs_open_context(data->ctx);
4768 kfree(data);
4769 dprintk("%s: done!\n", __func__);
4770}
4771
4772static const struct rpc_call_ops nfs4_lock_ops = {
4773 .rpc_call_prepare = nfs4_lock_prepare,
4774 .rpc_call_done = nfs4_lock_done,
4775 .rpc_release = nfs4_lock_release,
4776};
4777
4778static const struct rpc_call_ops nfs4_recover_lock_ops = {
4779 .rpc_call_prepare = nfs4_recover_lock_prepare,
4780 .rpc_call_done = nfs4_lock_done,
4781 .rpc_release = nfs4_lock_release,
4782};
4783
4784static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4785{
4786 switch (error) {
4787 case -NFS4ERR_ADMIN_REVOKED:
4788 case -NFS4ERR_BAD_STATEID:
4789 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4790 if (new_lock_owner != 0 ||
4791 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4792 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4793 break;
4794 case -NFS4ERR_STALE_STATEID:
4795 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4796 case -NFS4ERR_EXPIRED:
4797 nfs4_schedule_lease_recovery(server->nfs_client);
4798 };
4799}
4800
4801static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4802{
4803 struct nfs4_lockdata *data;
4804 struct rpc_task *task;
4805 struct rpc_message msg = {
4806 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4807 .rpc_cred = state->owner->so_cred,
4808 };
4809 struct rpc_task_setup task_setup_data = {
4810 .rpc_client = NFS_CLIENT(state->inode),
4811 .rpc_message = &msg,
4812 .callback_ops = &nfs4_lock_ops,
4813 .workqueue = nfsiod_workqueue,
4814 .flags = RPC_TASK_ASYNC,
4815 };
4816 int ret;
4817
4818 dprintk("%s: begin!\n", __func__);
4819 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4820 fl->fl_u.nfs4_fl.owner,
4821 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4822 if (data == NULL)
4823 return -ENOMEM;
4824 if (IS_SETLKW(cmd))
4825 data->arg.block = 1;
4826 if (recovery_type > NFS_LOCK_NEW) {
4827 if (recovery_type == NFS_LOCK_RECLAIM)
4828 data->arg.reclaim = NFS_LOCK_RECLAIM;
4829 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4830 }
4831 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4832 msg.rpc_argp = &data->arg;
4833 msg.rpc_resp = &data->res;
4834 task_setup_data.callback_data = data;
4835 task = rpc_run_task(&task_setup_data);
4836 if (IS_ERR(task))
4837 return PTR_ERR(task);
4838 ret = nfs4_wait_for_completion_rpc_task(task);
4839 if (ret == 0) {
4840 ret = data->rpc_status;
4841 if (ret)
4842 nfs4_handle_setlk_error(data->server, data->lsp,
4843 data->arg.new_lock_owner, ret);
4844 } else
4845 data->cancelled = 1;
4846 rpc_put_task(task);
4847 dprintk("%s: done, ret = %d!\n", __func__, ret);
4848 return ret;
4849}
4850
4851static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4852{
4853 struct nfs_server *server = NFS_SERVER(state->inode);
4854 struct nfs4_exception exception = {
4855 .inode = state->inode,
4856 };
4857 int err;
4858
4859 do {
4860 /* Cache the lock if possible... */
4861 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4862 return 0;
4863 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4864 if (err != -NFS4ERR_DELAY)
4865 break;
4866 nfs4_handle_exception(server, err, &exception);
4867 } while (exception.retry);
4868 return err;
4869}
4870
4871static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4872{
4873 struct nfs_server *server = NFS_SERVER(state->inode);
4874 struct nfs4_exception exception = {
4875 .inode = state->inode,
4876 };
4877 int err;
4878
4879 err = nfs4_set_lock_state(state, request);
4880 if (err != 0)
4881 return err;
4882 do {
4883 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4884 return 0;
4885 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4886 switch (err) {
4887 default:
4888 goto out;
4889 case -NFS4ERR_GRACE:
4890 case -NFS4ERR_DELAY:
4891 nfs4_handle_exception(server, err, &exception);
4892 err = 0;
4893 }
4894 } while (exception.retry);
4895out:
4896 return err;
4897}
4898
4899#if defined(CONFIG_NFS_V4_1)
4900/**
4901 * nfs41_check_expired_locks - possibly free a lock stateid
4902 *
4903 * @state: NFSv4 state for an inode
4904 *
4905 * Returns NFS_OK if recovery for this stateid is now finished.
4906 * Otherwise a negative NFS4ERR value is returned.
4907 */
4908static int nfs41_check_expired_locks(struct nfs4_state *state)
4909{
4910 int status, ret = -NFS4ERR_BAD_STATEID;
4911 struct nfs4_lock_state *lsp;
4912 struct nfs_server *server = NFS_SERVER(state->inode);
4913
4914 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4915 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4916 status = nfs41_test_stateid(server, &lsp->ls_stateid);
4917 if (status != NFS_OK) {
4918 /* Free the stateid unless the server
4919 * informs us the stateid is unrecognized. */
4920 if (status != -NFS4ERR_BAD_STATEID)
4921 nfs41_free_stateid(server,
4922 &lsp->ls_stateid);
4923 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4924 ret = status;
4925 }
4926 }
4927 };
4928
4929 return ret;
4930}
4931
4932static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4933{
4934 int status = NFS_OK;
4935
4936 if (test_bit(LK_STATE_IN_USE, &state->flags))
4937 status = nfs41_check_expired_locks(state);
4938 if (status != NFS_OK)
4939 status = nfs4_lock_expired(state, request);
4940 return status;
4941}
4942#endif
4943
4944static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4945{
4946 struct nfs_inode *nfsi = NFS_I(state->inode);
4947 unsigned char fl_flags = request->fl_flags;
4948 int status = -ENOLCK;
4949
4950 if ((fl_flags & FL_POSIX) &&
4951 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4952 goto out;
4953 /* Is this a delegated open? */
4954 status = nfs4_set_lock_state(state, request);
4955 if (status != 0)
4956 goto out;
4957 request->fl_flags |= FL_ACCESS;
4958 status = do_vfs_lock(request->fl_file, request);
4959 if (status < 0)
4960 goto out;
4961 down_read(&nfsi->rwsem);
4962 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4963 /* Yes: cache locks! */
4964 /* ...but avoid races with delegation recall... */
4965 request->fl_flags = fl_flags & ~FL_SLEEP;
4966 status = do_vfs_lock(request->fl_file, request);
4967 goto out_unlock;
4968 }
4969 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4970 if (status != 0)
4971 goto out_unlock;
4972 /* Note: we always want to sleep here! */
4973 request->fl_flags = fl_flags | FL_SLEEP;
4974 if (do_vfs_lock(request->fl_file, request) < 0)
4975 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4976 "manager!\n", __func__);
4977out_unlock:
4978 up_read(&nfsi->rwsem);
4979out:
4980 request->fl_flags = fl_flags;
4981 return status;
4982}
4983
4984static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4985{
4986 struct nfs4_exception exception = {
4987 .state = state,
4988 .inode = state->inode,
4989 };
4990 int err;
4991
4992 do {
4993 err = _nfs4_proc_setlk(state, cmd, request);
4994 if (err == -NFS4ERR_DENIED)
4995 err = -EAGAIN;
4996 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4997 err, &exception);
4998 } while (exception.retry);
4999 return err;
5000}
5001
5002static int
5003nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5004{
5005 struct nfs_open_context *ctx;
5006 struct nfs4_state *state;
5007 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5008 int status;
5009
5010 /* verify open state */
5011 ctx = nfs_file_open_context(filp);
5012 state = ctx->state;
5013
5014 if (request->fl_start < 0 || request->fl_end < 0)
5015 return -EINVAL;
5016
5017 if (IS_GETLK(cmd)) {
5018 if (state != NULL)
5019 return nfs4_proc_getlk(state, F_GETLK, request);
5020 return 0;
5021 }
5022
5023 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5024 return -EINVAL;
5025
5026 if (request->fl_type == F_UNLCK) {
5027 if (state != NULL)
5028 return nfs4_proc_unlck(state, cmd, request);
5029 return 0;
5030 }
5031
5032 if (state == NULL)
5033 return -ENOLCK;
5034 /*
5035 * Don't rely on the VFS having checked the file open mode,
5036 * since it won't do this for flock() locks.
5037 */
5038 switch (request->fl_type) {
5039 case F_RDLCK:
5040 if (!(filp->f_mode & FMODE_READ))
5041 return -EBADF;
5042 break;
5043 case F_WRLCK:
5044 if (!(filp->f_mode & FMODE_WRITE))
5045 return -EBADF;
5046 }
5047
5048 do {
5049 status = nfs4_proc_setlk(state, cmd, request);
5050 if ((status != -EAGAIN) || IS_SETLK(cmd))
5051 break;
5052 timeout = nfs4_set_lock_task_retry(timeout);
5053 status = -ERESTARTSYS;
5054 if (signalled())
5055 break;
5056 } while(status < 0);
5057 return status;
5058}
5059
5060int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
5061{
5062 struct nfs_server *server = NFS_SERVER(state->inode);
5063 struct nfs4_exception exception = { };
5064 int err;
5065
5066 err = nfs4_set_lock_state(state, fl);
5067 if (err != 0)
5068 goto out;
5069 do {
5070 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5071 switch (err) {
5072 default:
5073 printk(KERN_ERR "NFS: %s: unhandled error "
5074 "%d.\n", __func__, err);
5075 case 0:
5076 case -ESTALE:
5077 goto out;
5078 case -NFS4ERR_EXPIRED:
5079 nfs4_schedule_stateid_recovery(server, state);
5080 case -NFS4ERR_STALE_CLIENTID:
5081 case -NFS4ERR_STALE_STATEID:
5082 nfs4_schedule_lease_recovery(server->nfs_client);
5083 goto out;
5084 case -NFS4ERR_BADSESSION:
5085 case -NFS4ERR_BADSLOT:
5086 case -NFS4ERR_BAD_HIGH_SLOT:
5087 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5088 case -NFS4ERR_DEADSESSION:
5089 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5090 goto out;
5091 case -ERESTARTSYS:
5092 /*
5093 * The show must go on: exit, but mark the
5094 * stateid as needing recovery.
5095 */
5096 case -NFS4ERR_DELEG_REVOKED:
5097 case -NFS4ERR_ADMIN_REVOKED:
5098 case -NFS4ERR_BAD_STATEID:
5099 case -NFS4ERR_OPENMODE:
5100 nfs4_schedule_stateid_recovery(server, state);
5101 err = 0;
5102 goto out;
5103 case -EKEYEXPIRED:
5104 /*
5105 * User RPCSEC_GSS context has expired.
5106 * We cannot recover this stateid now, so
5107 * skip it and allow recovery thread to
5108 * proceed.
5109 */
5110 err = 0;
5111 goto out;
5112 case -ENOMEM:
5113 case -NFS4ERR_DENIED:
5114 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5115 err = 0;
5116 goto out;
5117 case -NFS4ERR_DELAY:
5118 break;
5119 }
5120 err = nfs4_handle_exception(server, err, &exception);
5121 } while (exception.retry);
5122out:
5123 return err;
5124}
5125
5126struct nfs_release_lockowner_data {
5127 struct nfs4_lock_state *lsp;
5128 struct nfs_server *server;
5129 struct nfs_release_lockowner_args args;
5130};
5131
5132static void nfs4_release_lockowner_release(void *calldata)
5133{
5134 struct nfs_release_lockowner_data *data = calldata;
5135 nfs4_free_lock_state(data->server, data->lsp);
5136 kfree(calldata);
5137}
5138
5139static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5140 .rpc_release = nfs4_release_lockowner_release,
5141};
5142
5143int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5144{
5145 struct nfs_server *server = lsp->ls_state->owner->so_server;
5146 struct nfs_release_lockowner_data *data;
5147 struct rpc_message msg = {
5148 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5149 };
5150
5151 if (server->nfs_client->cl_mvops->minor_version != 0)
5152 return -EINVAL;
5153 data = kmalloc(sizeof(*data), GFP_NOFS);
5154 if (!data)
5155 return -ENOMEM;
5156 data->lsp = lsp;
5157 data->server = server;
5158 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5159 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5160 data->args.lock_owner.s_dev = server->s_dev;
5161 msg.rpc_argp = &data->args;
5162 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5163 return 0;
5164}
5165
5166#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5167
5168static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5169 const void *buf, size_t buflen,
5170 int flags, int type)
5171{
5172 if (strcmp(key, "") != 0)
5173 return -EINVAL;
5174
5175 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5176}
5177
5178static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5179 void *buf, size_t buflen, int type)
5180{
5181 if (strcmp(key, "") != 0)
5182 return -EINVAL;
5183
5184 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5185}
5186
5187static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5188 size_t list_len, const char *name,
5189 size_t name_len, int type)
5190{
5191 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5192
5193 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5194 return 0;
5195
5196 if (list && len <= list_len)
5197 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5198 return len;
5199}
5200
5201/*
5202 * nfs_fhget will use either the mounted_on_fileid or the fileid
5203 */
5204static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5205{
5206 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5207 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5208 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5209 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5210 return;
5211
5212 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5213 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5214 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5215 fattr->nlink = 2;
5216}
5217
5218static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5219 const struct qstr *name,
5220 struct nfs4_fs_locations *fs_locations,
5221 struct page *page)
5222{
5223 struct nfs_server *server = NFS_SERVER(dir);
5224 u32 bitmask[2] = {
5225 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5226 };
5227 struct nfs4_fs_locations_arg args = {
5228 .dir_fh = NFS_FH(dir),
5229 .name = name,
5230 .page = page,
5231 .bitmask = bitmask,
5232 };
5233 struct nfs4_fs_locations_res res = {
5234 .fs_locations = fs_locations,
5235 };
5236 struct rpc_message msg = {
5237 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5238 .rpc_argp = &args,
5239 .rpc_resp = &res,
5240 };
5241 int status;
5242
5243 dprintk("%s: start\n", __func__);
5244
5245 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5246 * is not supported */
5247 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5248 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5249 else
5250 bitmask[0] |= FATTR4_WORD0_FILEID;
5251
5252 nfs_fattr_init(&fs_locations->fattr);
5253 fs_locations->server = server;
5254 fs_locations->nlocations = 0;
5255 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5256 dprintk("%s: returned status = %d\n", __func__, status);
5257 return status;
5258}
5259
5260int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5261 const struct qstr *name,
5262 struct nfs4_fs_locations *fs_locations,
5263 struct page *page)
5264{
5265 struct nfs4_exception exception = { };
5266 int err;
5267 do {
5268 err = nfs4_handle_exception(NFS_SERVER(dir),
5269 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5270 &exception);
5271 } while (exception.retry);
5272 return err;
5273}
5274
5275static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5276{
5277 int status;
5278 struct nfs4_secinfo_arg args = {
5279 .dir_fh = NFS_FH(dir),
5280 .name = name,
5281 };
5282 struct nfs4_secinfo_res res = {
5283 .flavors = flavors,
5284 };
5285 struct rpc_message msg = {
5286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5287 .rpc_argp = &args,
5288 .rpc_resp = &res,
5289 };
5290
5291 dprintk("NFS call secinfo %s\n", name->name);
5292 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5293 dprintk("NFS reply secinfo: %d\n", status);
5294 return status;
5295}
5296
5297int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5298 struct nfs4_secinfo_flavors *flavors)
5299{
5300 struct nfs4_exception exception = { };
5301 int err;
5302 do {
5303 err = nfs4_handle_exception(NFS_SERVER(dir),
5304 _nfs4_proc_secinfo(dir, name, flavors),
5305 &exception);
5306 } while (exception.retry);
5307 return err;
5308}
5309
5310#ifdef CONFIG_NFS_V4_1
5311/*
5312 * Check the exchange flags returned by the server for invalid flags, having
5313 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5314 * DS flags set.
5315 */
5316static int nfs4_check_cl_exchange_flags(u32 flags)
5317{
5318 if (flags & ~EXCHGID4_FLAG_MASK_R)
5319 goto out_inval;
5320 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5321 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5322 goto out_inval;
5323 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5324 goto out_inval;
5325 return NFS_OK;
5326out_inval:
5327 return -NFS4ERR_INVAL;
5328}
5329
5330static bool
5331nfs41_same_server_scope(struct nfs41_server_scope *a,
5332 struct nfs41_server_scope *b)
5333{
5334 if (a->server_scope_sz == b->server_scope_sz &&
5335 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5336 return true;
5337
5338 return false;
5339}
5340
5341/*
5342 * nfs4_proc_bind_conn_to_session()
5343 *
5344 * The 4.1 client currently uses the same TCP connection for the
5345 * fore and backchannel.
5346 */
5347int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5348{
5349 int status;
5350 struct nfs41_bind_conn_to_session_res res;
5351 struct rpc_message msg = {
5352 .rpc_proc =
5353 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5354 .rpc_argp = clp,
5355 .rpc_resp = &res,
5356 .rpc_cred = cred,
5357 };
5358
5359 dprintk("--> %s\n", __func__);
5360 BUG_ON(clp == NULL);
5361
5362 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5363 if (unlikely(res.session == NULL)) {
5364 status = -ENOMEM;
5365 goto out;
5366 }
5367
5368 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5369 if (status == 0) {
5370 if (memcmp(res.session->sess_id.data,
5371 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5372 dprintk("NFS: %s: Session ID mismatch\n", __func__);
5373 status = -EIO;
5374 goto out_session;
5375 }
5376 if (res.dir != NFS4_CDFS4_BOTH) {
5377 dprintk("NFS: %s: Unexpected direction from server\n",
5378 __func__);
5379 status = -EIO;
5380 goto out_session;
5381 }
5382 if (res.use_conn_in_rdma_mode) {
5383 dprintk("NFS: %s: Server returned RDMA mode = true\n",
5384 __func__);
5385 status = -EIO;
5386 goto out_session;
5387 }
5388 }
5389out_session:
5390 kfree(res.session);
5391out:
5392 dprintk("<-- %s status= %d\n", __func__, status);
5393 return status;
5394}
5395
5396/*
5397 * nfs4_proc_exchange_id()
5398 *
5399 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5400 *
5401 * Since the clientid has expired, all compounds using sessions
5402 * associated with the stale clientid will be returning
5403 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5404 * be in some phase of session reset.
5405 */
5406int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5407{
5408 nfs4_verifier verifier;
5409 struct nfs41_exchange_id_args args = {
5410 .verifier = &verifier,
5411 .client = clp,
5412 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5413 };
5414 struct nfs41_exchange_id_res res = {
5415 0
5416 };
5417 int status;
5418 struct rpc_message msg = {
5419 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5420 .rpc_argp = &args,
5421 .rpc_resp = &res,
5422 .rpc_cred = cred,
5423 };
5424
5425 nfs4_init_boot_verifier(clp, &verifier);
5426 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5427 sizeof(args.id));
5428 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
5429 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5430 args.id_len, args.id);
5431
5432 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5433 GFP_NOFS);
5434 if (unlikely(res.server_owner == NULL)) {
5435 status = -ENOMEM;
5436 goto out;
5437 }
5438
5439 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5440 GFP_NOFS);
5441 if (unlikely(res.server_scope == NULL)) {
5442 status = -ENOMEM;
5443 goto out_server_owner;
5444 }
5445
5446 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5447 if (unlikely(res.impl_id == NULL)) {
5448 status = -ENOMEM;
5449 goto out_server_scope;
5450 }
5451
5452 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5453 if (status == 0)
5454 status = nfs4_check_cl_exchange_flags(res.flags);
5455
5456 if (status == 0) {
5457 clp->cl_clientid = res.clientid;
5458 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5459 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5460 clp->cl_seqid = res.seqid;
5461
5462 kfree(clp->cl_serverowner);
5463 clp->cl_serverowner = res.server_owner;
5464 res.server_owner = NULL;
5465
5466 /* use the most recent implementation id */
5467 kfree(clp->cl_implid);
5468 clp->cl_implid = res.impl_id;
5469
5470 if (clp->cl_serverscope != NULL &&
5471 !nfs41_same_server_scope(clp->cl_serverscope,
5472 res.server_scope)) {
5473 dprintk("%s: server_scope mismatch detected\n",
5474 __func__);
5475 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5476 kfree(clp->cl_serverscope);
5477 clp->cl_serverscope = NULL;
5478 }
5479
5480 if (clp->cl_serverscope == NULL) {
5481 clp->cl_serverscope = res.server_scope;
5482 goto out;
5483 }
5484 } else
5485 kfree(res.impl_id);
5486
5487out_server_owner:
5488 kfree(res.server_owner);
5489out_server_scope:
5490 kfree(res.server_scope);
5491out:
5492 if (clp->cl_implid != NULL)
5493 dprintk("NFS reply exchange_id: Server Implementation ID: "
5494 "domain: %s, name: %s, date: %llu,%u\n",
5495 clp->cl_implid->domain, clp->cl_implid->name,
5496 clp->cl_implid->date.seconds,
5497 clp->cl_implid->date.nseconds);
5498 dprintk("NFS reply exchange_id: %d\n", status);
5499 return status;
5500}
5501
5502static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5503 struct rpc_cred *cred)
5504{
5505 struct rpc_message msg = {
5506 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5507 .rpc_argp = clp,
5508 .rpc_cred = cred,
5509 };
5510 int status;
5511
5512 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5513 if (status)
5514 dprintk("NFS: Got error %d from the server %s on "
5515 "DESTROY_CLIENTID.", status, clp->cl_hostname);
5516 return status;
5517}
5518
5519static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5520 struct rpc_cred *cred)
5521{
5522 unsigned int loop;
5523 int ret;
5524
5525 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5526 ret = _nfs4_proc_destroy_clientid(clp, cred);
5527 switch (ret) {
5528 case -NFS4ERR_DELAY:
5529 case -NFS4ERR_CLIENTID_BUSY:
5530 ssleep(1);
5531 break;
5532 default:
5533 return ret;
5534 }
5535 }
5536 return 0;
5537}
5538
5539int nfs4_destroy_clientid(struct nfs_client *clp)
5540{
5541 struct rpc_cred *cred;
5542 int ret = 0;
5543
5544 if (clp->cl_mvops->minor_version < 1)
5545 goto out;
5546 if (clp->cl_exchange_flags == 0)
5547 goto out;
5548 if (clp->cl_preserve_clid)
5549 goto out;
5550 cred = nfs4_get_exchange_id_cred(clp);
5551 ret = nfs4_proc_destroy_clientid(clp, cred);
5552 if (cred)
5553 put_rpccred(cred);
5554 switch (ret) {
5555 case 0:
5556 case -NFS4ERR_STALE_CLIENTID:
5557 clp->cl_exchange_flags = 0;
5558 }
5559out:
5560 return ret;
5561}
5562
5563struct nfs4_get_lease_time_data {
5564 struct nfs4_get_lease_time_args *args;
5565 struct nfs4_get_lease_time_res *res;
5566 struct nfs_client *clp;
5567};
5568
5569static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5570 void *calldata)
5571{
5572 int ret;
5573 struct nfs4_get_lease_time_data *data =
5574 (struct nfs4_get_lease_time_data *)calldata;
5575
5576 dprintk("--> %s\n", __func__);
5577 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5578 /* just setup sequence, do not trigger session recovery
5579 since we're invoked within one */
5580 ret = nfs41_setup_sequence(data->clp->cl_session,
5581 &data->args->la_seq_args,
5582 &data->res->lr_seq_res, task);
5583
5584 BUG_ON(ret == -EAGAIN);
5585 rpc_call_start(task);
5586 dprintk("<-- %s\n", __func__);
5587}
5588
5589/*
5590 * Called from nfs4_state_manager thread for session setup, so don't recover
5591 * from sequence operation or clientid errors.
5592 */
5593static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5594{
5595 struct nfs4_get_lease_time_data *data =
5596 (struct nfs4_get_lease_time_data *)calldata;
5597
5598 dprintk("--> %s\n", __func__);
5599 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5600 return;
5601 switch (task->tk_status) {
5602 case -NFS4ERR_DELAY:
5603 case -NFS4ERR_GRACE:
5604 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5605 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5606 task->tk_status = 0;
5607 /* fall through */
5608 case -NFS4ERR_RETRY_UNCACHED_REP:
5609 rpc_restart_call_prepare(task);
5610 return;
5611 }
5612 dprintk("<-- %s\n", __func__);
5613}
5614
5615static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5616 .rpc_call_prepare = nfs4_get_lease_time_prepare,
5617 .rpc_call_done = nfs4_get_lease_time_done,
5618};
5619
5620int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5621{
5622 struct rpc_task *task;
5623 struct nfs4_get_lease_time_args args;
5624 struct nfs4_get_lease_time_res res = {
5625 .lr_fsinfo = fsinfo,
5626 };
5627 struct nfs4_get_lease_time_data data = {
5628 .args = &args,
5629 .res = &res,
5630 .clp = clp,
5631 };
5632 struct rpc_message msg = {
5633 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5634 .rpc_argp = &args,
5635 .rpc_resp = &res,
5636 };
5637 struct rpc_task_setup task_setup = {
5638 .rpc_client = clp->cl_rpcclient,
5639 .rpc_message = &msg,
5640 .callback_ops = &nfs4_get_lease_time_ops,
5641 .callback_data = &data,
5642 .flags = RPC_TASK_TIMEOUT,
5643 };
5644 int status;
5645
5646 nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5647 dprintk("--> %s\n", __func__);
5648 task = rpc_run_task(&task_setup);
5649
5650 if (IS_ERR(task))
5651 status = PTR_ERR(task);
5652 else {
5653 status = task->tk_status;
5654 rpc_put_task(task);
5655 }
5656 dprintk("<-- %s return %d\n", __func__, status);
5657
5658 return status;
5659}
5660
5661static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5662{
5663 return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5664}
5665
5666static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5667 struct nfs4_slot *new,
5668 u32 max_slots,
5669 u32 ivalue)
5670{
5671 struct nfs4_slot *old = NULL;
5672 u32 i;
5673
5674 spin_lock(&tbl->slot_tbl_lock);
5675 if (new) {
5676 old = tbl->slots;
5677 tbl->slots = new;
5678 tbl->max_slots = max_slots;
5679 }
5680 tbl->highest_used_slotid = NFS4_NO_SLOT;
5681 for (i = 0; i < tbl->max_slots; i++)
5682 tbl->slots[i].seq_nr = ivalue;
5683 spin_unlock(&tbl->slot_tbl_lock);
5684 kfree(old);
5685}
5686
5687/*
5688 * (re)Initialise a slot table
5689 */
5690static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5691 u32 ivalue)
5692{
5693 struct nfs4_slot *new = NULL;
5694 int ret = -ENOMEM;
5695
5696 dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5697 max_reqs, tbl->max_slots);
5698
5699 /* Does the newly negotiated max_reqs match the existing slot table? */
5700 if (max_reqs != tbl->max_slots) {
5701 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5702 if (!new)
5703 goto out;
5704 }
5705 ret = 0;
5706
5707 nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5708 dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5709 tbl, tbl->slots, tbl->max_slots);
5710out:
5711 dprintk("<-- %s: return %d\n", __func__, ret);
5712 return ret;
5713}
5714
5715/* Destroy the slot table */
5716static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5717{
5718 if (session->fc_slot_table.slots != NULL) {
5719 kfree(session->fc_slot_table.slots);
5720 session->fc_slot_table.slots = NULL;
5721 }
5722 if (session->bc_slot_table.slots != NULL) {
5723 kfree(session->bc_slot_table.slots);
5724 session->bc_slot_table.slots = NULL;
5725 }
5726 return;
5727}
5728
5729/*
5730 * Initialize or reset the forechannel and backchannel tables
5731 */
5732static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5733{
5734 struct nfs4_slot_table *tbl;
5735 int status;
5736
5737 dprintk("--> %s\n", __func__);
5738 /* Fore channel */
5739 tbl = &ses->fc_slot_table;
5740 status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5741 if (status) /* -ENOMEM */
5742 return status;
5743 /* Back channel */
5744 tbl = &ses->bc_slot_table;
5745 status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5746 if (status && tbl->slots == NULL)
5747 /* Fore and back channel share a connection so get
5748 * both slot tables or neither */
5749 nfs4_destroy_slot_tables(ses);
5750 return status;
5751}
5752
5753struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5754{
5755 struct nfs4_session *session;
5756 struct nfs4_slot_table *tbl;
5757
5758 session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5759 if (!session)
5760 return NULL;
5761
5762 tbl = &session->fc_slot_table;
5763 tbl->highest_used_slotid = NFS4_NO_SLOT;
5764 spin_lock_init(&tbl->slot_tbl_lock);
5765 rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5766 init_completion(&tbl->complete);
5767
5768 tbl = &session->bc_slot_table;
5769 tbl->highest_used_slotid = NFS4_NO_SLOT;
5770 spin_lock_init(&tbl->slot_tbl_lock);
5771 rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5772 init_completion(&tbl->complete);
5773
5774 session->session_state = 1<<NFS4_SESSION_INITING;
5775
5776 session->clp = clp;
5777 return session;
5778}
5779
5780void nfs4_destroy_session(struct nfs4_session *session)
5781{
5782 struct rpc_xprt *xprt;
5783 struct rpc_cred *cred;
5784
5785 cred = nfs4_get_exchange_id_cred(session->clp);
5786 nfs4_proc_destroy_session(session, cred);
5787 if (cred)
5788 put_rpccred(cred);
5789
5790 rcu_read_lock();
5791 xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5792 rcu_read_unlock();
5793 dprintk("%s Destroy backchannel for xprt %p\n",
5794 __func__, xprt);
5795 xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5796 nfs4_destroy_slot_tables(session);
5797 kfree(session);
5798}
5799
5800/*
5801 * Initialize the values to be used by the client in CREATE_SESSION
5802 * If nfs4_init_session set the fore channel request and response sizes,
5803 * use them.
5804 *
5805 * Set the back channel max_resp_sz_cached to zero to force the client to
5806 * always set csa_cachethis to FALSE because the current implementation
5807 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5808 */
5809static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5810{
5811 struct nfs4_session *session = args->client->cl_session;
5812 unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5813 mxresp_sz = session->fc_attrs.max_resp_sz;
5814
5815 if (mxrqst_sz == 0)
5816 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5817 if (mxresp_sz == 0)
5818 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5819 /* Fore channel attributes */
5820 args->fc_attrs.max_rqst_sz = mxrqst_sz;
5821 args->fc_attrs.max_resp_sz = mxresp_sz;
5822 args->fc_attrs.max_ops = NFS4_MAX_OPS;
5823 args->fc_attrs.max_reqs = max_session_slots;
5824
5825 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5826 "max_ops=%u max_reqs=%u\n",
5827 __func__,
5828 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5829 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5830
5831 /* Back channel attributes */
5832 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5833 args->bc_attrs.max_resp_sz = PAGE_SIZE;
5834 args->bc_attrs.max_resp_sz_cached = 0;
5835 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5836 args->bc_attrs.max_reqs = 1;
5837
5838 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5839 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5840 __func__,
5841 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5842 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5843 args->bc_attrs.max_reqs);
5844}
5845
5846static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5847{
5848 struct nfs4_channel_attrs *sent = &args->fc_attrs;
5849 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5850
5851 if (rcvd->max_resp_sz > sent->max_resp_sz)
5852 return -EINVAL;
5853 /*
5854 * Our requested max_ops is the minimum we need; we're not
5855 * prepared to break up compounds into smaller pieces than that.
5856 * So, no point even trying to continue if the server won't
5857 * cooperate:
5858 */
5859 if (rcvd->max_ops < sent->max_ops)
5860 return -EINVAL;
5861 if (rcvd->max_reqs == 0)
5862 return -EINVAL;
5863 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5864 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5865 return 0;
5866}
5867
5868static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5869{
5870 struct nfs4_channel_attrs *sent = &args->bc_attrs;
5871 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5872
5873 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5874 return -EINVAL;
5875 if (rcvd->max_resp_sz < sent->max_resp_sz)
5876 return -EINVAL;
5877 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5878 return -EINVAL;
5879 /* These would render the backchannel useless: */
5880 if (rcvd->max_ops != sent->max_ops)
5881 return -EINVAL;
5882 if (rcvd->max_reqs != sent->max_reqs)
5883 return -EINVAL;
5884 return 0;
5885}
5886
5887static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5888 struct nfs4_session *session)
5889{
5890 int ret;
5891
5892 ret = nfs4_verify_fore_channel_attrs(args, session);
5893 if (ret)
5894 return ret;
5895 return nfs4_verify_back_channel_attrs(args, session);
5896}
5897
5898static int _nfs4_proc_create_session(struct nfs_client *clp,
5899 struct rpc_cred *cred)
5900{
5901 struct nfs4_session *session = clp->cl_session;
5902 struct nfs41_create_session_args args = {
5903 .client = clp,
5904 .cb_program = NFS4_CALLBACK,
5905 };
5906 struct nfs41_create_session_res res = {
5907 .client = clp,
5908 };
5909 struct rpc_message msg = {
5910 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5911 .rpc_argp = &args,
5912 .rpc_resp = &res,
5913 .rpc_cred = cred,
5914 };
5915 int status;
5916
5917 nfs4_init_channel_attrs(&args);
5918 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5919
5920 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5921
5922 if (!status)
5923 /* Verify the session's negotiated channel_attrs values */
5924 status = nfs4_verify_channel_attrs(&args, session);
5925 if (!status) {
5926 /* Increment the clientid slot sequence id */
5927 clp->cl_seqid++;
5928 }
5929
5930 return status;
5931}
5932
5933/*
5934 * Issues a CREATE_SESSION operation to the server.
5935 * It is the responsibility of the caller to verify the session is
5936 * expired before calling this routine.
5937 */
5938int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5939{
5940 int status;
5941 unsigned *ptr;
5942 struct nfs4_session *session = clp->cl_session;
5943
5944 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5945
5946 status = _nfs4_proc_create_session(clp, cred);
5947 if (status)
5948 goto out;
5949
5950 /* Init or reset the session slot tables */
5951 status = nfs4_setup_session_slot_tables(session);
5952 dprintk("slot table setup returned %d\n", status);
5953 if (status)
5954 goto out;
5955
5956 ptr = (unsigned *)&session->sess_id.data[0];
5957 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5958 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5959out:
5960 dprintk("<-- %s\n", __func__);
5961 return status;
5962}
5963
5964/*
5965 * Issue the over-the-wire RPC DESTROY_SESSION.
5966 * The caller must serialize access to this routine.
5967 */
5968int nfs4_proc_destroy_session(struct nfs4_session *session,
5969 struct rpc_cred *cred)
5970{
5971 struct rpc_message msg = {
5972 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5973 .rpc_argp = session,
5974 .rpc_cred = cred,
5975 };
5976 int status = 0;
5977
5978 dprintk("--> nfs4_proc_destroy_session\n");
5979
5980 /* session is still being setup */
5981 if (session->clp->cl_cons_state != NFS_CS_READY)
5982 return status;
5983
5984 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5985
5986 if (status)
5987 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5988 "Session has been destroyed regardless...\n", status);
5989
5990 dprintk("<-- nfs4_proc_destroy_session\n");
5991 return status;
5992}
5993
5994/*
5995 * With sessions, the client is not marked ready until after a
5996 * successful EXCHANGE_ID and CREATE_SESSION.
5997 *
5998 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5999 * other versions of NFS can be tried.
6000 */
6001static int nfs41_check_session_ready(struct nfs_client *clp)
6002{
6003 int ret;
6004
6005 if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
6006 ret = nfs4_client_recover_expired_lease(clp);
6007 if (ret)
6008 return ret;
6009 }
6010 if (clp->cl_cons_state < NFS_CS_READY)
6011 return -EPROTONOSUPPORT;
6012 smp_rmb();
6013 return 0;
6014}
6015
6016int nfs4_init_session(struct nfs_server *server)
6017{
6018 struct nfs_client *clp = server->nfs_client;
6019 struct nfs4_session *session;
6020 unsigned int rsize, wsize;
6021
6022 if (!nfs4_has_session(clp))
6023 return 0;
6024
6025 session = clp->cl_session;
6026 spin_lock(&clp->cl_lock);
6027 if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6028
6029 rsize = server->rsize;
6030 if (rsize == 0)
6031 rsize = NFS_MAX_FILE_IO_SIZE;
6032 wsize = server->wsize;
6033 if (wsize == 0)
6034 wsize = NFS_MAX_FILE_IO_SIZE;
6035
6036 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
6037 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
6038 }
6039 spin_unlock(&clp->cl_lock);
6040
6041 return nfs41_check_session_ready(clp);
6042}
6043
6044int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
6045{
6046 struct nfs4_session *session = clp->cl_session;
6047 int ret;
6048
6049 spin_lock(&clp->cl_lock);
6050 if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6051 /*
6052 * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
6053 * DS lease to be equal to the MDS lease.
6054 */
6055 clp->cl_lease_time = lease_time;
6056 clp->cl_last_renewal = jiffies;
6057 }
6058 spin_unlock(&clp->cl_lock);
6059
6060 ret = nfs41_check_session_ready(clp);
6061 if (ret)
6062 return ret;
6063 /* Test for the DS role */
6064 if (!is_ds_client(clp))
6065 return -ENODEV;
6066 return 0;
6067}
6068EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
6069
6070
6071/*
6072 * Renew the cl_session lease.
6073 */
6074struct nfs4_sequence_data {
6075 struct nfs_client *clp;
6076 struct nfs4_sequence_args args;
6077 struct nfs4_sequence_res res;
6078};
6079
6080static void nfs41_sequence_release(void *data)
6081{
6082 struct nfs4_sequence_data *calldata = data;
6083 struct nfs_client *clp = calldata->clp;
6084
6085 if (atomic_read(&clp->cl_count) > 1)
6086 nfs4_schedule_state_renewal(clp);
6087 nfs_put_client(clp);
6088 kfree(calldata);
6089}
6090
6091static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6092{
6093 switch(task->tk_status) {
6094 case -NFS4ERR_DELAY:
6095 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6096 return -EAGAIN;
6097 default:
6098 nfs4_schedule_lease_recovery(clp);
6099 }
6100 return 0;
6101}
6102
6103static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6104{
6105 struct nfs4_sequence_data *calldata = data;
6106 struct nfs_client *clp = calldata->clp;
6107
6108 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6109 return;
6110
6111 if (task->tk_status < 0) {
6112 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6113 if (atomic_read(&clp->cl_count) == 1)
6114 goto out;
6115
6116 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6117 rpc_restart_call_prepare(task);
6118 return;
6119 }
6120 }
6121 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6122out:
6123 dprintk("<-- %s\n", __func__);
6124}
6125
6126static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6127{
6128 struct nfs4_sequence_data *calldata = data;
6129 struct nfs_client *clp = calldata->clp;
6130 struct nfs4_sequence_args *args;
6131 struct nfs4_sequence_res *res;
6132
6133 args = task->tk_msg.rpc_argp;
6134 res = task->tk_msg.rpc_resp;
6135
6136 if (nfs41_setup_sequence(clp->cl_session, args, res, task))
6137 return;
6138 rpc_call_start(task);
6139}
6140
6141static const struct rpc_call_ops nfs41_sequence_ops = {
6142 .rpc_call_done = nfs41_sequence_call_done,
6143 .rpc_call_prepare = nfs41_sequence_prepare,
6144 .rpc_release = nfs41_sequence_release,
6145};
6146
6147static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6148{
6149 struct nfs4_sequence_data *calldata;
6150 struct rpc_message msg = {
6151 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6152 .rpc_cred = cred,
6153 };
6154 struct rpc_task_setup task_setup_data = {
6155 .rpc_client = clp->cl_rpcclient,
6156 .rpc_message = &msg,
6157 .callback_ops = &nfs41_sequence_ops,
6158 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
6159 };
6160
6161 if (!atomic_inc_not_zero(&clp->cl_count))
6162 return ERR_PTR(-EIO);
6163 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6164 if (calldata == NULL) {
6165 nfs_put_client(clp);
6166 return ERR_PTR(-ENOMEM);
6167 }
6168 nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6169 msg.rpc_argp = &calldata->args;
6170 msg.rpc_resp = &calldata->res;
6171 calldata->clp = clp;
6172 task_setup_data.callback_data = calldata;
6173
6174 return rpc_run_task(&task_setup_data);
6175}
6176
6177static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6178{
6179 struct rpc_task *task;
6180 int ret = 0;
6181
6182 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6183 return 0;
6184 task = _nfs41_proc_sequence(clp, cred);
6185 if (IS_ERR(task))
6186 ret = PTR_ERR(task);
6187 else
6188 rpc_put_task_async(task);
6189 dprintk("<-- %s status=%d\n", __func__, ret);
6190 return ret;
6191}
6192
6193static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6194{
6195 struct rpc_task *task;
6196 int ret;
6197
6198 task = _nfs41_proc_sequence(clp, cred);
6199 if (IS_ERR(task)) {
6200 ret = PTR_ERR(task);
6201 goto out;
6202 }
6203 ret = rpc_wait_for_completion_task(task);
6204 if (!ret) {
6205 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6206
6207 if (task->tk_status == 0)
6208 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6209 ret = task->tk_status;
6210 }
6211 rpc_put_task(task);
6212out:
6213 dprintk("<-- %s status=%d\n", __func__, ret);
6214 return ret;
6215}
6216
6217struct nfs4_reclaim_complete_data {
6218 struct nfs_client *clp;
6219 struct nfs41_reclaim_complete_args arg;
6220 struct nfs41_reclaim_complete_res res;
6221};
6222
6223static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6224{
6225 struct nfs4_reclaim_complete_data *calldata = data;
6226
6227 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6228 if (nfs41_setup_sequence(calldata->clp->cl_session,
6229 &calldata->arg.seq_args,
6230 &calldata->res.seq_res, task))
6231 return;
6232
6233 rpc_call_start(task);
6234}
6235
6236static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6237{
6238 switch(task->tk_status) {
6239 case 0:
6240 case -NFS4ERR_COMPLETE_ALREADY:
6241 case -NFS4ERR_WRONG_CRED: /* What to do here? */
6242 break;
6243 case -NFS4ERR_DELAY:
6244 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6245 /* fall through */
6246 case -NFS4ERR_RETRY_UNCACHED_REP:
6247 return -EAGAIN;
6248 default:
6249 nfs4_schedule_lease_recovery(clp);
6250 }
6251 return 0;
6252}
6253
6254static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6255{
6256 struct nfs4_reclaim_complete_data *calldata = data;
6257 struct nfs_client *clp = calldata->clp;
6258 struct nfs4_sequence_res *res = &calldata->res.seq_res;
6259
6260 dprintk("--> %s\n", __func__);
6261 if (!nfs41_sequence_done(task, res))
6262 return;
6263
6264 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6265 rpc_restart_call_prepare(task);
6266 return;
6267 }
6268 dprintk("<-- %s\n", __func__);
6269}
6270
6271static void nfs4_free_reclaim_complete_data(void *data)
6272{
6273 struct nfs4_reclaim_complete_data *calldata = data;
6274
6275 kfree(calldata);
6276}
6277
6278static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6279 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6280 .rpc_call_done = nfs4_reclaim_complete_done,
6281 .rpc_release = nfs4_free_reclaim_complete_data,
6282};
6283
6284/*
6285 * Issue a global reclaim complete.
6286 */
6287static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6288{
6289 struct nfs4_reclaim_complete_data *calldata;
6290 struct rpc_task *task;
6291 struct rpc_message msg = {
6292 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6293 };
6294 struct rpc_task_setup task_setup_data = {
6295 .rpc_client = clp->cl_rpcclient,
6296 .rpc_message = &msg,
6297 .callback_ops = &nfs4_reclaim_complete_call_ops,
6298 .flags = RPC_TASK_ASYNC,
6299 };
6300 int status = -ENOMEM;
6301
6302 dprintk("--> %s\n", __func__);
6303 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6304 if (calldata == NULL)
6305 goto out;
6306 calldata->clp = clp;
6307 calldata->arg.one_fs = 0;
6308
6309 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6310 msg.rpc_argp = &calldata->arg;
6311 msg.rpc_resp = &calldata->res;
6312 task_setup_data.callback_data = calldata;
6313 task = rpc_run_task(&task_setup_data);
6314 if (IS_ERR(task)) {
6315 status = PTR_ERR(task);
6316 goto out;
6317 }
6318 status = nfs4_wait_for_completion_rpc_task(task);
6319 if (status == 0)
6320 status = task->tk_status;
6321 rpc_put_task(task);
6322 return 0;
6323out:
6324 dprintk("<-- %s status=%d\n", __func__, status);
6325 return status;
6326}
6327
6328static void
6329nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6330{
6331 struct nfs4_layoutget *lgp = calldata;
6332 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6333
6334 dprintk("--> %s\n", __func__);
6335 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6336 * right now covering the LAYOUTGET we are about to send.
6337 * However, that is not so catastrophic, and there seems
6338 * to be no way to prevent it completely.
6339 */
6340 if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6341 &lgp->res.seq_res, task))
6342 return;
6343 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6344 NFS_I(lgp->args.inode)->layout,
6345 lgp->args.ctx->state)) {
6346 rpc_exit(task, NFS4_OK);
6347 return;
6348 }
6349 rpc_call_start(task);
6350}
6351
6352static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6353{
6354 struct nfs4_layoutget *lgp = calldata;
6355 struct inode *inode = lgp->args.inode;
6356 struct nfs_server *server = NFS_SERVER(inode);
6357 struct pnfs_layout_hdr *lo;
6358 struct nfs4_state *state = NULL;
6359
6360 dprintk("--> %s\n", __func__);
6361
6362 if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6363 goto out;
6364
6365 switch (task->tk_status) {
6366 case 0:
6367 goto out;
6368 case -NFS4ERR_LAYOUTTRYLATER:
6369 case -NFS4ERR_RECALLCONFLICT:
6370 task->tk_status = -NFS4ERR_DELAY;
6371 break;
6372 case -NFS4ERR_EXPIRED:
6373 case -NFS4ERR_BAD_STATEID:
6374 spin_lock(&inode->i_lock);
6375 lo = NFS_I(inode)->layout;
6376 if (!lo || list_empty(&lo->plh_segs)) {
6377 spin_unlock(&inode->i_lock);
6378 /* If the open stateid was bad, then recover it. */
6379 state = lgp->args.ctx->state;
6380 } else {
6381 LIST_HEAD(head);
6382
6383 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6384 spin_unlock(&inode->i_lock);
6385 /* Mark the bad layout state as invalid, then
6386 * retry using the open stateid. */
6387 pnfs_free_lseg_list(&head);
6388 }
6389 }
6390 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6391 rpc_restart_call_prepare(task);
6392out:
6393 dprintk("<-- %s\n", __func__);
6394}
6395
6396static size_t max_response_pages(struct nfs_server *server)
6397{
6398 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6399 return nfs_page_array_len(0, max_resp_sz);
6400}
6401
6402static void nfs4_free_pages(struct page **pages, size_t size)
6403{
6404 int i;
6405
6406 if (!pages)
6407 return;
6408
6409 for (i = 0; i < size; i++) {
6410 if (!pages[i])
6411 break;
6412 __free_page(pages[i]);
6413 }
6414 kfree(pages);
6415}
6416
6417static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6418{
6419 struct page **pages;
6420 int i;
6421
6422 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6423 if (!pages) {
6424 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6425 return NULL;
6426 }
6427
6428 for (i = 0; i < size; i++) {
6429 pages[i] = alloc_page(gfp_flags);
6430 if (!pages[i]) {
6431 dprintk("%s: failed to allocate page\n", __func__);
6432 nfs4_free_pages(pages, size);
6433 return NULL;
6434 }
6435 }
6436
6437 return pages;
6438}
6439
6440static void nfs4_layoutget_release(void *calldata)
6441{
6442 struct nfs4_layoutget *lgp = calldata;
6443 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6444 size_t max_pages = max_response_pages(server);
6445
6446 dprintk("--> %s\n", __func__);
6447 nfs4_free_pages(lgp->args.layout.pages, max_pages);
6448 put_nfs_open_context(lgp->args.ctx);
6449 kfree(calldata);
6450 dprintk("<-- %s\n", __func__);
6451}
6452
6453static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6454 .rpc_call_prepare = nfs4_layoutget_prepare,
6455 .rpc_call_done = nfs4_layoutget_done,
6456 .rpc_release = nfs4_layoutget_release,
6457};
6458
6459struct pnfs_layout_segment *
6460nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6461{
6462 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6463 size_t max_pages = max_response_pages(server);
6464 struct rpc_task *task;
6465 struct rpc_message msg = {
6466 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6467 .rpc_argp = &lgp->args,
6468 .rpc_resp = &lgp->res,
6469 };
6470 struct rpc_task_setup task_setup_data = {
6471 .rpc_client = server->client,
6472 .rpc_message = &msg,
6473 .callback_ops = &nfs4_layoutget_call_ops,
6474 .callback_data = lgp,
6475 .flags = RPC_TASK_ASYNC,
6476 };
6477 struct pnfs_layout_segment *lseg = NULL;
6478 int status = 0;
6479
6480 dprintk("--> %s\n", __func__);
6481
6482 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6483 if (!lgp->args.layout.pages) {
6484 nfs4_layoutget_release(lgp);
6485 return ERR_PTR(-ENOMEM);
6486 }
6487 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6488
6489 lgp->res.layoutp = &lgp->args.layout;
6490 lgp->res.seq_res.sr_slot = NULL;
6491 nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6492 task = rpc_run_task(&task_setup_data);
6493 if (IS_ERR(task))
6494 return ERR_CAST(task);
6495 status = nfs4_wait_for_completion_rpc_task(task);
6496 if (status == 0)
6497 status = task->tk_status;
6498 if (status == 0)
6499 lseg = pnfs_layout_process(lgp);
6500 rpc_put_task(task);
6501 dprintk("<-- %s status=%d\n", __func__, status);
6502 if (status)
6503 return ERR_PTR(status);
6504 return lseg;
6505}
6506
6507static void
6508nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6509{
6510 struct nfs4_layoutreturn *lrp = calldata;
6511
6512 dprintk("--> %s\n", __func__);
6513 if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6514 &lrp->res.seq_res, task))
6515 return;
6516 rpc_call_start(task);
6517}
6518
6519static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6520{
6521 struct nfs4_layoutreturn *lrp = calldata;
6522 struct nfs_server *server;
6523
6524 dprintk("--> %s\n", __func__);
6525
6526 if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6527 return;
6528
6529 server = NFS_SERVER(lrp->args.inode);
6530 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6531 rpc_restart_call_prepare(task);
6532 return;
6533 }
6534 dprintk("<-- %s\n", __func__);
6535}
6536
6537static void nfs4_layoutreturn_release(void *calldata)
6538{
6539 struct nfs4_layoutreturn *lrp = calldata;
6540 struct pnfs_layout_hdr *lo = lrp->args.layout;
6541
6542 dprintk("--> %s\n", __func__);
6543 spin_lock(&lo->plh_inode->i_lock);
6544 if (lrp->res.lrs_present)
6545 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6546 lo->plh_block_lgets--;
6547 spin_unlock(&lo->plh_inode->i_lock);
6548 pnfs_put_layout_hdr(lrp->args.layout);
6549 kfree(calldata);
6550 dprintk("<-- %s\n", __func__);
6551}
6552
6553static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6554 .rpc_call_prepare = nfs4_layoutreturn_prepare,
6555 .rpc_call_done = nfs4_layoutreturn_done,
6556 .rpc_release = nfs4_layoutreturn_release,
6557};
6558
6559int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6560{
6561 struct rpc_task *task;
6562 struct rpc_message msg = {
6563 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6564 .rpc_argp = &lrp->args,
6565 .rpc_resp = &lrp->res,
6566 };
6567 struct rpc_task_setup task_setup_data = {
6568 .rpc_client = lrp->clp->cl_rpcclient,
6569 .rpc_message = &msg,
6570 .callback_ops = &nfs4_layoutreturn_call_ops,
6571 .callback_data = lrp,
6572 };
6573 int status;
6574
6575 dprintk("--> %s\n", __func__);
6576 nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6577 task = rpc_run_task(&task_setup_data);
6578 if (IS_ERR(task))
6579 return PTR_ERR(task);
6580 status = task->tk_status;
6581 dprintk("<-- %s status=%d\n", __func__, status);
6582 rpc_put_task(task);
6583 return status;
6584}
6585
6586/*
6587 * Retrieve the list of Data Server devices from the MDS.
6588 */
6589static int _nfs4_getdevicelist(struct nfs_server *server,
6590 const struct nfs_fh *fh,
6591 struct pnfs_devicelist *devlist)
6592{
6593 struct nfs4_getdevicelist_args args = {
6594 .fh = fh,
6595 .layoutclass = server->pnfs_curr_ld->id,
6596 };
6597 struct nfs4_getdevicelist_res res = {
6598 .devlist = devlist,
6599 };
6600 struct rpc_message msg = {
6601 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6602 .rpc_argp = &args,
6603 .rpc_resp = &res,
6604 };
6605 int status;
6606
6607 dprintk("--> %s\n", __func__);
6608 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6609 &res.seq_res, 0);
6610 dprintk("<-- %s status=%d\n", __func__, status);
6611 return status;
6612}
6613
6614int nfs4_proc_getdevicelist(struct nfs_server *server,
6615 const struct nfs_fh *fh,
6616 struct pnfs_devicelist *devlist)
6617{
6618 struct nfs4_exception exception = { };
6619 int err;
6620
6621 do {
6622 err = nfs4_handle_exception(server,
6623 _nfs4_getdevicelist(server, fh, devlist),
6624 &exception);
6625 } while (exception.retry);
6626
6627 dprintk("%s: err=%d, num_devs=%u\n", __func__,
6628 err, devlist->num_devs);
6629
6630 return err;
6631}
6632EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6633
6634static int
6635_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6636{
6637 struct nfs4_getdeviceinfo_args args = {
6638 .pdev = pdev,
6639 };
6640 struct nfs4_getdeviceinfo_res res = {
6641 .pdev = pdev,
6642 };
6643 struct rpc_message msg = {
6644 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6645 .rpc_argp = &args,
6646 .rpc_resp = &res,
6647 };
6648 int status;
6649
6650 dprintk("--> %s\n", __func__);
6651 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6652 dprintk("<-- %s status=%d\n", __func__, status);
6653
6654 return status;
6655}
6656
6657int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6658{
6659 struct nfs4_exception exception = { };
6660 int err;
6661
6662 do {
6663 err = nfs4_handle_exception(server,
6664 _nfs4_proc_getdeviceinfo(server, pdev),
6665 &exception);
6666 } while (exception.retry);
6667 return err;
6668}
6669EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6670
6671static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6672{
6673 struct nfs4_layoutcommit_data *data = calldata;
6674 struct nfs_server *server = NFS_SERVER(data->args.inode);
6675
6676 if (nfs4_setup_sequence(server, &data->args.seq_args,
6677 &data->res.seq_res, task))
6678 return;
6679 rpc_call_start(task);
6680}
6681
6682static void
6683nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6684{
6685 struct nfs4_layoutcommit_data *data = calldata;
6686 struct nfs_server *server = NFS_SERVER(data->args.inode);
6687
6688 if (!nfs4_sequence_done(task, &data->res.seq_res))
6689 return;
6690
6691 switch (task->tk_status) { /* Just ignore these failures */
6692 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6693 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
6694 case -NFS4ERR_BADLAYOUT: /* no layout */
6695 case -NFS4ERR_GRACE: /* loca_recalim always false */
6696 task->tk_status = 0;
6697 break;
6698 case 0:
6699 nfs_post_op_update_inode_force_wcc(data->args.inode,
6700 data->res.fattr);
6701 break;
6702 default:
6703 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6704 rpc_restart_call_prepare(task);
6705 return;
6706 }
6707 }
6708}
6709
6710static void nfs4_layoutcommit_release(void *calldata)
6711{
6712 struct nfs4_layoutcommit_data *data = calldata;
6713 struct pnfs_layout_segment *lseg, *tmp;
6714 unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6715
6716 pnfs_cleanup_layoutcommit(data);
6717 /* Matched by references in pnfs_set_layoutcommit */
6718 list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6719 list_del_init(&lseg->pls_lc_list);
6720 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6721 &lseg->pls_flags))
6722 pnfs_put_lseg(lseg);
6723 }
6724
6725 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6726 smp_mb__after_clear_bit();
6727 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6728
6729 put_rpccred(data->cred);
6730 kfree(data);
6731}
6732
6733static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6734 .rpc_call_prepare = nfs4_layoutcommit_prepare,
6735 .rpc_call_done = nfs4_layoutcommit_done,
6736 .rpc_release = nfs4_layoutcommit_release,
6737};
6738
6739int
6740nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6741{
6742 struct rpc_message msg = {
6743 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6744 .rpc_argp = &data->args,
6745 .rpc_resp = &data->res,
6746 .rpc_cred = data->cred,
6747 };
6748 struct rpc_task_setup task_setup_data = {
6749 .task = &data->task,
6750 .rpc_client = NFS_CLIENT(data->args.inode),
6751 .rpc_message = &msg,
6752 .callback_ops = &nfs4_layoutcommit_ops,
6753 .callback_data = data,
6754 .flags = RPC_TASK_ASYNC,
6755 };
6756 struct rpc_task *task;
6757 int status = 0;
6758
6759 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6760 "lbw: %llu inode %lu\n",
6761 data->task.tk_pid, sync,
6762 data->args.lastbytewritten,
6763 data->args.inode->i_ino);
6764
6765 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6766 task = rpc_run_task(&task_setup_data);
6767 if (IS_ERR(task))
6768 return PTR_ERR(task);
6769 if (sync == false)
6770 goto out;
6771 status = nfs4_wait_for_completion_rpc_task(task);
6772 if (status != 0)
6773 goto out;
6774 status = task->tk_status;
6775out:
6776 dprintk("%s: status %d\n", __func__, status);
6777 rpc_put_task(task);
6778 return status;
6779}
6780
6781static int
6782_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6783 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6784{
6785 struct nfs41_secinfo_no_name_args args = {
6786 .style = SECINFO_STYLE_CURRENT_FH,
6787 };
6788 struct nfs4_secinfo_res res = {
6789 .flavors = flavors,
6790 };
6791 struct rpc_message msg = {
6792 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6793 .rpc_argp = &args,
6794 .rpc_resp = &res,
6795 };
6796 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6797}
6798
6799static int
6800nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6801 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6802{
6803 struct nfs4_exception exception = { };
6804 int err;
6805 do {
6806 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6807 switch (err) {
6808 case 0:
6809 case -NFS4ERR_WRONGSEC:
6810 case -NFS4ERR_NOTSUPP:
6811 goto out;
6812 default:
6813 err = nfs4_handle_exception(server, err, &exception);
6814 }
6815 } while (exception.retry);
6816out:
6817 return err;
6818}
6819
6820static int
6821nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6822 struct nfs_fsinfo *info)
6823{
6824 int err;
6825 struct page *page;
6826 rpc_authflavor_t flavor;
6827 struct nfs4_secinfo_flavors *flavors;
6828
6829 page = alloc_page(GFP_KERNEL);
6830 if (!page) {
6831 err = -ENOMEM;
6832 goto out;
6833 }
6834
6835 flavors = page_address(page);
6836 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6837
6838 /*
6839 * Fall back on "guess and check" method if
6840 * the server doesn't support SECINFO_NO_NAME
6841 */
6842 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6843 err = nfs4_find_root_sec(server, fhandle, info);
6844 goto out_freepage;
6845 }
6846 if (err)
6847 goto out_freepage;
6848
6849 flavor = nfs_find_best_sec(flavors);
6850 if (err == 0)
6851 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6852
6853out_freepage:
6854 put_page(page);
6855 if (err == -EACCES)
6856 return -EPERM;
6857out:
6858 return err;
6859}
6860
6861static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6862{
6863 int status;
6864 struct nfs41_test_stateid_args args = {
6865 .stateid = stateid,
6866 };
6867 struct nfs41_test_stateid_res res;
6868 struct rpc_message msg = {
6869 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6870 .rpc_argp = &args,
6871 .rpc_resp = &res,
6872 };
6873
6874 dprintk("NFS call test_stateid %p\n", stateid);
6875 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6876 status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6877 if (status != NFS_OK) {
6878 dprintk("NFS reply test_stateid: failed, %d\n", status);
6879 return status;
6880 }
6881 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6882 return -res.status;
6883}
6884
6885/**
6886 * nfs41_test_stateid - perform a TEST_STATEID operation
6887 *
6888 * @server: server / transport on which to perform the operation
6889 * @stateid: state ID to test
6890 *
6891 * Returns NFS_OK if the server recognizes that "stateid" is valid.
6892 * Otherwise a negative NFS4ERR value is returned if the operation
6893 * failed or the state ID is not currently valid.
6894 */
6895static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6896{
6897 struct nfs4_exception exception = { };
6898 int err;
6899 do {
6900 err = _nfs41_test_stateid(server, stateid);
6901 if (err != -NFS4ERR_DELAY)
6902 break;
6903 nfs4_handle_exception(server, err, &exception);
6904 } while (exception.retry);
6905 return err;
6906}
6907
6908static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6909{
6910 struct nfs41_free_stateid_args args = {
6911 .stateid = stateid,
6912 };
6913 struct nfs41_free_stateid_res res;
6914 struct rpc_message msg = {
6915 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6916 .rpc_argp = &args,
6917 .rpc_resp = &res,
6918 };
6919 int status;
6920
6921 dprintk("NFS call free_stateid %p\n", stateid);
6922 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6923 status = nfs4_call_sync_sequence(server->client, server, &msg,
6924 &args.seq_args, &res.seq_res, 1);
6925 dprintk("NFS reply free_stateid: %d\n", status);
6926 return status;
6927}
6928
6929/**
6930 * nfs41_free_stateid - perform a FREE_STATEID operation
6931 *
6932 * @server: server / transport on which to perform the operation
6933 * @stateid: state ID to release
6934 *
6935 * Returns NFS_OK if the server freed "stateid". Otherwise a
6936 * negative NFS4ERR value is returned.
6937 */
6938static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6939{
6940 struct nfs4_exception exception = { };
6941 int err;
6942 do {
6943 err = _nfs4_free_stateid(server, stateid);
6944 if (err != -NFS4ERR_DELAY)
6945 break;
6946 nfs4_handle_exception(server, err, &exception);
6947 } while (exception.retry);
6948 return err;
6949}
6950
6951static bool nfs41_match_stateid(const nfs4_stateid *s1,
6952 const nfs4_stateid *s2)
6953{
6954 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6955 return false;
6956
6957 if (s1->seqid == s2->seqid)
6958 return true;
6959 if (s1->seqid == 0 || s2->seqid == 0)
6960 return true;
6961
6962 return false;
6963}
6964
6965#endif /* CONFIG_NFS_V4_1 */
6966
6967static bool nfs4_match_stateid(const nfs4_stateid *s1,
6968 const nfs4_stateid *s2)
6969{
6970 return nfs4_stateid_match(s1, s2);
6971}
6972
6973
6974static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6975 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6976 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6977 .recover_open = nfs4_open_reclaim,
6978 .recover_lock = nfs4_lock_reclaim,
6979 .establish_clid = nfs4_init_clientid,
6980 .get_clid_cred = nfs4_get_setclientid_cred,
6981 .detect_trunking = nfs40_discover_server_trunking,
6982};
6983
6984#if defined(CONFIG_NFS_V4_1)
6985static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6986 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6987 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6988 .recover_open = nfs4_open_reclaim,
6989 .recover_lock = nfs4_lock_reclaim,
6990 .establish_clid = nfs41_init_clientid,
6991 .get_clid_cred = nfs4_get_exchange_id_cred,
6992 .reclaim_complete = nfs41_proc_reclaim_complete,
6993 .detect_trunking = nfs41_discover_server_trunking,
6994};
6995#endif /* CONFIG_NFS_V4_1 */
6996
6997static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6998 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6999 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7000 .recover_open = nfs4_open_expired,
7001 .recover_lock = nfs4_lock_expired,
7002 .establish_clid = nfs4_init_clientid,
7003 .get_clid_cred = nfs4_get_setclientid_cred,
7004};
7005
7006#if defined(CONFIG_NFS_V4_1)
7007static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7008 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7009 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7010 .recover_open = nfs41_open_expired,
7011 .recover_lock = nfs41_lock_expired,
7012 .establish_clid = nfs41_init_clientid,
7013 .get_clid_cred = nfs4_get_exchange_id_cred,
7014};
7015#endif /* CONFIG_NFS_V4_1 */
7016
7017static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7018 .sched_state_renewal = nfs4_proc_async_renew,
7019 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7020 .renew_lease = nfs4_proc_renew,
7021};
7022
7023#if defined(CONFIG_NFS_V4_1)
7024static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7025 .sched_state_renewal = nfs41_proc_async_sequence,
7026 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7027 .renew_lease = nfs4_proc_sequence,
7028};
7029#endif
7030
7031static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7032 .minor_version = 0,
7033 .call_sync = _nfs4_call_sync,
7034 .match_stateid = nfs4_match_stateid,
7035 .find_root_sec = nfs4_find_root_sec,
7036 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7037 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7038 .state_renewal_ops = &nfs40_state_renewal_ops,
7039};
7040
7041#if defined(CONFIG_NFS_V4_1)
7042static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7043 .minor_version = 1,
7044 .call_sync = _nfs4_call_sync_session,
7045 .match_stateid = nfs41_match_stateid,
7046 .find_root_sec = nfs41_find_root_sec,
7047 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7048 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7049 .state_renewal_ops = &nfs41_state_renewal_ops,
7050};
7051#endif
7052
7053const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7054 [0] = &nfs_v4_0_minor_ops,
7055#if defined(CONFIG_NFS_V4_1)
7056 [1] = &nfs_v4_1_minor_ops,
7057#endif
7058};
7059
7060const struct inode_operations nfs4_dir_inode_operations = {
7061 .create = nfs_create,
7062 .lookup = nfs_lookup,
7063 .atomic_open = nfs_atomic_open,
7064 .link = nfs_link,
7065 .unlink = nfs_unlink,
7066 .symlink = nfs_symlink,
7067 .mkdir = nfs_mkdir,
7068 .rmdir = nfs_rmdir,
7069 .mknod = nfs_mknod,
7070 .rename = nfs_rename,
7071 .permission = nfs_permission,
7072 .getattr = nfs_getattr,
7073 .setattr = nfs_setattr,
7074 .getxattr = generic_getxattr,
7075 .setxattr = generic_setxattr,
7076 .listxattr = generic_listxattr,
7077 .removexattr = generic_removexattr,
7078};
7079
7080static const struct inode_operations nfs4_file_inode_operations = {
7081 .permission = nfs_permission,
7082 .getattr = nfs_getattr,
7083 .setattr = nfs_setattr,
7084 .getxattr = generic_getxattr,
7085 .setxattr = generic_setxattr,
7086 .listxattr = generic_listxattr,
7087 .removexattr = generic_removexattr,
7088};
7089
7090const struct nfs_rpc_ops nfs_v4_clientops = {
7091 .version = 4, /* protocol version */
7092 .dentry_ops = &nfs4_dentry_operations,
7093 .dir_inode_ops = &nfs4_dir_inode_operations,
7094 .file_inode_ops = &nfs4_file_inode_operations,
7095 .file_ops = &nfs4_file_operations,
7096 .getroot = nfs4_proc_get_root,
7097 .submount = nfs4_submount,
7098 .try_mount = nfs4_try_mount,
7099 .getattr = nfs4_proc_getattr,
7100 .setattr = nfs4_proc_setattr,
7101 .lookup = nfs4_proc_lookup,
7102 .access = nfs4_proc_access,
7103 .readlink = nfs4_proc_readlink,
7104 .create = nfs4_proc_create,
7105 .remove = nfs4_proc_remove,
7106 .unlink_setup = nfs4_proc_unlink_setup,
7107 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7108 .unlink_done = nfs4_proc_unlink_done,
7109 .rename = nfs4_proc_rename,
7110 .rename_setup = nfs4_proc_rename_setup,
7111 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7112 .rename_done = nfs4_proc_rename_done,
7113 .link = nfs4_proc_link,
7114 .symlink = nfs4_proc_symlink,
7115 .mkdir = nfs4_proc_mkdir,
7116 .rmdir = nfs4_proc_remove,
7117 .readdir = nfs4_proc_readdir,
7118 .mknod = nfs4_proc_mknod,
7119 .statfs = nfs4_proc_statfs,
7120 .fsinfo = nfs4_proc_fsinfo,
7121 .pathconf = nfs4_proc_pathconf,
7122 .set_capabilities = nfs4_server_capabilities,
7123 .decode_dirent = nfs4_decode_dirent,
7124 .read_setup = nfs4_proc_read_setup,
7125 .read_pageio_init = pnfs_pageio_init_read,
7126 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7127 .read_done = nfs4_read_done,
7128 .write_setup = nfs4_proc_write_setup,
7129 .write_pageio_init = pnfs_pageio_init_write,
7130 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7131 .write_done = nfs4_write_done,
7132 .commit_setup = nfs4_proc_commit_setup,
7133 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7134 .commit_done = nfs4_commit_done,
7135 .lock = nfs4_proc_lock,
7136 .clear_acl_cache = nfs4_zap_acl_attr,
7137 .close_context = nfs4_close_context,
7138 .open_context = nfs4_atomic_open,
7139 .have_delegation = nfs4_have_delegation,
7140 .return_delegation = nfs4_inode_return_delegation,
7141 .alloc_client = nfs4_alloc_client,
7142 .init_client = nfs4_init_client,
7143 .free_client = nfs4_free_client,
7144 .create_server = nfs4_create_server,
7145 .clone_server = nfs_clone_server,
7146};
7147
7148static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7149 .prefix = XATTR_NAME_NFSV4_ACL,
7150 .list = nfs4_xattr_list_nfs4_acl,
7151 .get = nfs4_xattr_get_nfs4_acl,
7152 .set = nfs4_xattr_set_nfs4_acl,
7153};
7154
7155const struct xattr_handler *nfs4_xattr_handlers[] = {
7156 &nfs4_xattr_nfs4_acl_handler,
7157 NULL
7158};
7159
7160/*
7161 * Local variables:
7162 * c-basic-offset: 8
7163 * End:
7164 */
Linux 6.x block layer and io_uring tree(s)