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NFSv4: Simplify the NFSv4/v4.1 synchronous call switch
[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/xattr.h>
56#include <linux/utsname.h>
57#include <linux/freezer.h>
58
59#include "nfs4_fs.h"
60#include "delegation.h"
61#include "internal.h"
62#include "iostat.h"
63#include "callback.h"
64#include "pnfs.h"
65#include "netns.h"
66#include "nfs4session.h"
67
68
69#define NFSDBG_FACILITY NFSDBG_PROC
70
71#define NFS4_POLL_RETRY_MIN (HZ/10)
72#define NFS4_POLL_RETRY_MAX (15*HZ)
73
74struct nfs4_opendata;
75static int _nfs4_proc_open(struct nfs4_opendata *data);
76static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
77static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
78static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
79static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
80static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
81static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
82static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
83 struct nfs_fattr *fattr, struct iattr *sattr,
84 struct nfs4_state *state);
85#ifdef CONFIG_NFS_V4_1
86static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
87static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
88#endif
89/* Prevent leaks of NFSv4 errors into userland */
90static int nfs4_map_errors(int err)
91{
92 if (err >= -1000)
93 return err;
94 switch (err) {
95 case -NFS4ERR_RESOURCE:
96 return -EREMOTEIO;
97 case -NFS4ERR_WRONGSEC:
98 return -EPERM;
99 case -NFS4ERR_BADOWNER:
100 case -NFS4ERR_BADNAME:
101 return -EINVAL;
102 case -NFS4ERR_SHARE_DENIED:
103 return -EACCES;
104 case -NFS4ERR_MINOR_VERS_MISMATCH:
105 return -EPROTONOSUPPORT;
106 case -NFS4ERR_ACCESS:
107 return -EACCES;
108 default:
109 dprintk("%s could not handle NFSv4 error %d\n",
110 __func__, -err);
111 break;
112 }
113 return -EIO;
114}
115
116/*
117 * This is our standard bitmap for GETATTR requests.
118 */
119const u32 nfs4_fattr_bitmap[3] = {
120 FATTR4_WORD0_TYPE
121 | FATTR4_WORD0_CHANGE
122 | FATTR4_WORD0_SIZE
123 | FATTR4_WORD0_FSID
124 | FATTR4_WORD0_FILEID,
125 FATTR4_WORD1_MODE
126 | FATTR4_WORD1_NUMLINKS
127 | FATTR4_WORD1_OWNER
128 | FATTR4_WORD1_OWNER_GROUP
129 | FATTR4_WORD1_RAWDEV
130 | FATTR4_WORD1_SPACE_USED
131 | FATTR4_WORD1_TIME_ACCESS
132 | FATTR4_WORD1_TIME_METADATA
133 | FATTR4_WORD1_TIME_MODIFY
134};
135
136static const u32 nfs4_pnfs_open_bitmap[3] = {
137 FATTR4_WORD0_TYPE
138 | FATTR4_WORD0_CHANGE
139 | FATTR4_WORD0_SIZE
140 | FATTR4_WORD0_FSID
141 | FATTR4_WORD0_FILEID,
142 FATTR4_WORD1_MODE
143 | FATTR4_WORD1_NUMLINKS
144 | FATTR4_WORD1_OWNER
145 | FATTR4_WORD1_OWNER_GROUP
146 | FATTR4_WORD1_RAWDEV
147 | FATTR4_WORD1_SPACE_USED
148 | FATTR4_WORD1_TIME_ACCESS
149 | FATTR4_WORD1_TIME_METADATA
150 | FATTR4_WORD1_TIME_MODIFY,
151 FATTR4_WORD2_MDSTHRESHOLD
152};
153
154static const u32 nfs4_open_noattr_bitmap[3] = {
155 FATTR4_WORD0_TYPE
156 | FATTR4_WORD0_CHANGE
157 | FATTR4_WORD0_FILEID,
158};
159
160const u32 nfs4_statfs_bitmap[2] = {
161 FATTR4_WORD0_FILES_AVAIL
162 | FATTR4_WORD0_FILES_FREE
163 | FATTR4_WORD0_FILES_TOTAL,
164 FATTR4_WORD1_SPACE_AVAIL
165 | FATTR4_WORD1_SPACE_FREE
166 | FATTR4_WORD1_SPACE_TOTAL
167};
168
169const u32 nfs4_pathconf_bitmap[2] = {
170 FATTR4_WORD0_MAXLINK
171 | FATTR4_WORD0_MAXNAME,
172 0
173};
174
175const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
176 | FATTR4_WORD0_MAXREAD
177 | FATTR4_WORD0_MAXWRITE
178 | FATTR4_WORD0_LEASE_TIME,
179 FATTR4_WORD1_TIME_DELTA
180 | FATTR4_WORD1_FS_LAYOUT_TYPES,
181 FATTR4_WORD2_LAYOUT_BLKSIZE
182};
183
184const u32 nfs4_fs_locations_bitmap[2] = {
185 FATTR4_WORD0_TYPE
186 | FATTR4_WORD0_CHANGE
187 | FATTR4_WORD0_SIZE
188 | FATTR4_WORD0_FSID
189 | FATTR4_WORD0_FILEID
190 | FATTR4_WORD0_FS_LOCATIONS,
191 FATTR4_WORD1_MODE
192 | FATTR4_WORD1_NUMLINKS
193 | FATTR4_WORD1_OWNER
194 | FATTR4_WORD1_OWNER_GROUP
195 | FATTR4_WORD1_RAWDEV
196 | FATTR4_WORD1_SPACE_USED
197 | FATTR4_WORD1_TIME_ACCESS
198 | FATTR4_WORD1_TIME_METADATA
199 | FATTR4_WORD1_TIME_MODIFY
200 | FATTR4_WORD1_MOUNTED_ON_FILEID
201};
202
203static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
204 struct nfs4_readdir_arg *readdir)
205{
206 __be32 *start, *p;
207
208 if (cookie > 2) {
209 readdir->cookie = cookie;
210 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
211 return;
212 }
213
214 readdir->cookie = 0;
215 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
216 if (cookie == 2)
217 return;
218
219 /*
220 * NFSv4 servers do not return entries for '.' and '..'
221 * Therefore, we fake these entries here. We let '.'
222 * have cookie 0 and '..' have cookie 1. Note that
223 * when talking to the server, we always send cookie 0
224 * instead of 1 or 2.
225 */
226 start = p = kmap_atomic(*readdir->pages);
227
228 if (cookie == 0) {
229 *p++ = xdr_one; /* next */
230 *p++ = xdr_zero; /* cookie, first word */
231 *p++ = xdr_one; /* cookie, second word */
232 *p++ = xdr_one; /* entry len */
233 memcpy(p, ".\0\0\0", 4); /* entry */
234 p++;
235 *p++ = xdr_one; /* bitmap length */
236 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
237 *p++ = htonl(8); /* attribute buffer length */
238 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
239 }
240
241 *p++ = xdr_one; /* next */
242 *p++ = xdr_zero; /* cookie, first word */
243 *p++ = xdr_two; /* cookie, second word */
244 *p++ = xdr_two; /* entry len */
245 memcpy(p, "..\0\0", 4); /* entry */
246 p++;
247 *p++ = xdr_one; /* bitmap length */
248 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
249 *p++ = htonl(8); /* attribute buffer length */
250 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
251
252 readdir->pgbase = (char *)p - (char *)start;
253 readdir->count -= readdir->pgbase;
254 kunmap_atomic(start);
255}
256
257static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
258{
259 int res = 0;
260
261 might_sleep();
262
263 if (*timeout <= 0)
264 *timeout = NFS4_POLL_RETRY_MIN;
265 if (*timeout > NFS4_POLL_RETRY_MAX)
266 *timeout = NFS4_POLL_RETRY_MAX;
267 freezable_schedule_timeout_killable(*timeout);
268 if (fatal_signal_pending(current))
269 res = -ERESTARTSYS;
270 *timeout <<= 1;
271 return res;
272}
273
274/* This is the error handling routine for processes that are allowed
275 * to sleep.
276 */
277static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
278{
279 struct nfs_client *clp = server->nfs_client;
280 struct nfs4_state *state = exception->state;
281 struct inode *inode = exception->inode;
282 int ret = errorcode;
283
284 exception->retry = 0;
285 switch(errorcode) {
286 case 0:
287 return 0;
288 case -NFS4ERR_OPENMODE:
289 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
290 nfs4_inode_return_delegation(inode);
291 exception->retry = 1;
292 return 0;
293 }
294 if (state == NULL)
295 break;
296 nfs4_schedule_stateid_recovery(server, state);
297 goto wait_on_recovery;
298 case -NFS4ERR_DELEG_REVOKED:
299 case -NFS4ERR_ADMIN_REVOKED:
300 case -NFS4ERR_BAD_STATEID:
301 if (state == NULL)
302 break;
303 nfs_remove_bad_delegation(state->inode);
304 nfs4_schedule_stateid_recovery(server, state);
305 goto wait_on_recovery;
306 case -NFS4ERR_EXPIRED:
307 if (state != NULL)
308 nfs4_schedule_stateid_recovery(server, state);
309 case -NFS4ERR_STALE_STATEID:
310 case -NFS4ERR_STALE_CLIENTID:
311 nfs4_schedule_lease_recovery(clp);
312 goto wait_on_recovery;
313#if defined(CONFIG_NFS_V4_1)
314 case -NFS4ERR_BADSESSION:
315 case -NFS4ERR_BADSLOT:
316 case -NFS4ERR_BAD_HIGH_SLOT:
317 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
318 case -NFS4ERR_DEADSESSION:
319 case -NFS4ERR_SEQ_FALSE_RETRY:
320 case -NFS4ERR_SEQ_MISORDERED:
321 dprintk("%s ERROR: %d Reset session\n", __func__,
322 errorcode);
323 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
324 goto wait_on_recovery;
325#endif /* defined(CONFIG_NFS_V4_1) */
326 case -NFS4ERR_FILE_OPEN:
327 if (exception->timeout > HZ) {
328 /* We have retried a decent amount, time to
329 * fail
330 */
331 ret = -EBUSY;
332 break;
333 }
334 case -NFS4ERR_GRACE:
335 case -NFS4ERR_DELAY:
336 case -EKEYEXPIRED:
337 ret = nfs4_delay(server->client, &exception->timeout);
338 if (ret != 0)
339 break;
340 case -NFS4ERR_RETRY_UNCACHED_REP:
341 case -NFS4ERR_OLD_STATEID:
342 exception->retry = 1;
343 break;
344 case -NFS4ERR_BADOWNER:
345 /* The following works around a Linux server bug! */
346 case -NFS4ERR_BADNAME:
347 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
348 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
349 exception->retry = 1;
350 printk(KERN_WARNING "NFS: v4 server %s "
351 "does not accept raw "
352 "uid/gids. "
353 "Reenabling the idmapper.\n",
354 server->nfs_client->cl_hostname);
355 }
356 }
357 /* We failed to handle the error */
358 return nfs4_map_errors(ret);
359wait_on_recovery:
360 ret = nfs4_wait_clnt_recover(clp);
361 if (ret == 0)
362 exception->retry = 1;
363 return ret;
364}
365
366
367static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
368{
369 spin_lock(&clp->cl_lock);
370 if (time_before(clp->cl_last_renewal,timestamp))
371 clp->cl_last_renewal = timestamp;
372 spin_unlock(&clp->cl_lock);
373}
374
375static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
376{
377 do_renew_lease(server->nfs_client, timestamp);
378}
379
380#if defined(CONFIG_NFS_V4_1)
381
382bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
383{
384 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
385 return true;
386}
387
388static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
389{
390 struct nfs4_session *session;
391 struct nfs4_slot_table *tbl;
392 bool send_new_highest_used_slotid = false;
393
394 if (!res->sr_slot) {
395 /* just wake up the next guy waiting since
396 * we may have not consumed a slot after all */
397 dprintk("%s: No slot\n", __func__);
398 return;
399 }
400 tbl = res->sr_slot->table;
401 session = tbl->session;
402
403 spin_lock(&tbl->slot_tbl_lock);
404 /* Be nice to the server: try to ensure that the last transmitted
405 * value for highest_user_slotid <= target_highest_slotid
406 */
407 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
408 send_new_highest_used_slotid = true;
409
410 nfs4_free_slot(tbl, res->sr_slot);
411
412 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
413 send_new_highest_used_slotid = false;
414 if (!nfs4_session_draining(session)) {
415 if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
416 nfs4_set_task_privileged, NULL) != NULL)
417 send_new_highest_used_slotid = false;
418 }
419 spin_unlock(&tbl->slot_tbl_lock);
420 res->sr_slot = NULL;
421 if (send_new_highest_used_slotid)
422 nfs41_server_notify_highest_slotid_update(session->clp);
423}
424
425static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
426{
427 struct nfs4_session *session;
428 struct nfs4_slot *slot;
429 unsigned long timestamp;
430 struct nfs_client *clp;
431
432 /*
433 * sr_status remains 1 if an RPC level error occurred. The server
434 * may or may not have processed the sequence operation..
435 * Proceed as if the server received and processed the sequence
436 * operation.
437 */
438 if (res->sr_status == 1)
439 res->sr_status = NFS_OK;
440
441 /* don't increment the sequence number if the task wasn't sent */
442 if (!RPC_WAS_SENT(task))
443 goto out;
444
445 slot = res->sr_slot;
446 session = slot->table->session;
447
448 /* Check the SEQUENCE operation status */
449 switch (res->sr_status) {
450 case 0:
451 /* Update the slot's sequence and clientid lease timer */
452 ++slot->seq_nr;
453 timestamp = slot->renewal_time;
454 clp = session->clp;
455 do_renew_lease(clp, timestamp);
456 /* Check sequence flags */
457 if (res->sr_status_flags != 0)
458 nfs4_schedule_lease_recovery(clp);
459 nfs41_update_target_slotid(slot->table, slot, res);
460 break;
461 case -NFS4ERR_DELAY:
462 /* The server detected a resend of the RPC call and
463 * returned NFS4ERR_DELAY as per Section 2.10.6.2
464 * of RFC5661.
465 */
466 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
467 __func__,
468 slot->slot_nr,
469 slot->seq_nr);
470 goto out_retry;
471 default:
472 /* Just update the slot sequence no. */
473 ++slot->seq_nr;
474 }
475out:
476 /* The session may be reset by one of the error handlers. */
477 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
478 nfs41_sequence_free_slot(res);
479 return 1;
480out_retry:
481 if (!rpc_restart_call(task))
482 goto out;
483 rpc_delay(task, NFS4_POLL_RETRY_MAX);
484 return 0;
485}
486
487static int nfs4_sequence_done(struct rpc_task *task,
488 struct nfs4_sequence_res *res)
489{
490 if (res->sr_slot == NULL)
491 return 1;
492 return nfs41_sequence_done(task, res);
493}
494
495static void nfs41_init_sequence(struct nfs4_sequence_args *args,
496 struct nfs4_sequence_res *res, int cache_reply)
497{
498 args->sa_slot = NULL;
499 args->sa_cache_this = 0;
500 if (cache_reply)
501 args->sa_cache_this = 1;
502 res->sr_slot = NULL;
503}
504
505int nfs41_setup_sequence(struct nfs4_session *session,
506 struct nfs4_sequence_args *args,
507 struct nfs4_sequence_res *res,
508 struct rpc_task *task)
509{
510 struct nfs4_slot *slot;
511 struct nfs4_slot_table *tbl;
512
513 dprintk("--> %s\n", __func__);
514 /* slot already allocated? */
515 if (res->sr_slot != NULL)
516 goto out_success;
517
518 tbl = &session->fc_slot_table;
519
520 task->tk_timeout = 0;
521
522 spin_lock(&tbl->slot_tbl_lock);
523 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
524 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
525 /* The state manager will wait until the slot table is empty */
526 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
527 spin_unlock(&tbl->slot_tbl_lock);
528 dprintk("%s session is draining\n", __func__);
529 return -EAGAIN;
530 }
531
532 if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
533 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
534 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
535 spin_unlock(&tbl->slot_tbl_lock);
536 dprintk("%s enforce FIFO order\n", __func__);
537 return -EAGAIN;
538 }
539
540 slot = nfs4_alloc_slot(tbl);
541 if (IS_ERR(slot)) {
542 /* If out of memory, try again in 1/4 second */
543 if (slot == ERR_PTR(-ENOMEM))
544 task->tk_timeout = HZ >> 2;
545 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
546 spin_unlock(&tbl->slot_tbl_lock);
547 dprintk("<-- %s: no free slots\n", __func__);
548 return -EAGAIN;
549 }
550 spin_unlock(&tbl->slot_tbl_lock);
551
552 rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
553
554 args->sa_slot = slot;
555
556 dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
557 slot->slot_nr, slot->seq_nr);
558
559 res->sr_slot = slot;
560 res->sr_status_flags = 0;
561 /*
562 * sr_status is only set in decode_sequence, and so will remain
563 * set to 1 if an rpc level failure occurs.
564 */
565 res->sr_status = 1;
566out_success:
567 rpc_call_start(task);
568 return 0;
569}
570EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
571
572int nfs4_setup_sequence(const struct nfs_server *server,
573 struct nfs4_sequence_args *args,
574 struct nfs4_sequence_res *res,
575 struct rpc_task *task)
576{
577 struct nfs4_session *session = nfs4_get_session(server);
578 int ret = 0;
579
580 if (session == NULL) {
581 rpc_call_start(task);
582 goto out;
583 }
584
585 dprintk("--> %s clp %p session %p sr_slot %d\n",
586 __func__, session->clp, session, res->sr_slot ?
587 res->sr_slot->slot_nr : -1);
588
589 ret = nfs41_setup_sequence(session, args, res, task);
590out:
591 dprintk("<-- %s status=%d\n", __func__, ret);
592 return ret;
593}
594
595struct nfs41_call_sync_data {
596 const struct nfs_server *seq_server;
597 struct nfs4_sequence_args *seq_args;
598 struct nfs4_sequence_res *seq_res;
599};
600
601static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
602{
603 struct nfs41_call_sync_data *data = calldata;
604 struct nfs4_session *session = nfs4_get_session(data->seq_server);
605
606 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
607
608 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
609}
610
611static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
612{
613 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
614 nfs41_call_sync_prepare(task, calldata);
615}
616
617static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
618{
619 struct nfs41_call_sync_data *data = calldata;
620
621 nfs41_sequence_done(task, data->seq_res);
622}
623
624static const struct rpc_call_ops nfs41_call_sync_ops = {
625 .rpc_call_prepare = nfs41_call_sync_prepare,
626 .rpc_call_done = nfs41_call_sync_done,
627};
628
629static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
630 .rpc_call_prepare = nfs41_call_priv_sync_prepare,
631 .rpc_call_done = nfs41_call_sync_done,
632};
633
634static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
635 struct nfs_server *server,
636 struct rpc_message *msg,
637 struct nfs4_sequence_args *args,
638 struct nfs4_sequence_res *res,
639 int privileged)
640{
641 int ret;
642 struct rpc_task *task;
643 struct nfs41_call_sync_data data = {
644 .seq_server = server,
645 .seq_args = args,
646 .seq_res = res,
647 };
648 struct rpc_task_setup task_setup = {
649 .rpc_client = clnt,
650 .rpc_message = msg,
651 .callback_ops = &nfs41_call_sync_ops,
652 .callback_data = &data
653 };
654
655 if (privileged)
656 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
657 task = rpc_run_task(&task_setup);
658 if (IS_ERR(task))
659 ret = PTR_ERR(task);
660 else {
661 ret = task->tk_status;
662 rpc_put_task(task);
663 }
664 return ret;
665}
666
667static
668int _nfs4_call_sync_session(struct rpc_clnt *clnt,
669 struct nfs_server *server,
670 struct rpc_message *msg,
671 struct nfs4_sequence_args *args,
672 struct nfs4_sequence_res *res)
673{
674 return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
675}
676
677#else
678static inline
679void nfs41_init_sequence(struct nfs4_sequence_args *args,
680 struct nfs4_sequence_res *res, int cache_reply)
681{
682}
683
684static int nfs4_sequence_done(struct rpc_task *task,
685 struct nfs4_sequence_res *res)
686{
687 return 1;
688}
689#endif /* CONFIG_NFS_V4_1 */
690
691static
692int _nfs4_call_sync(struct rpc_clnt *clnt,
693 struct nfs_server *server,
694 struct rpc_message *msg,
695 struct nfs4_sequence_args *args,
696 struct nfs4_sequence_res *res)
697{
698 return rpc_call_sync(clnt, msg, 0);
699}
700
701static
702int nfs4_call_sync(struct rpc_clnt *clnt,
703 struct nfs_server *server,
704 struct rpc_message *msg,
705 struct nfs4_sequence_args *args,
706 struct nfs4_sequence_res *res,
707 int cache_reply)
708{
709 nfs41_init_sequence(args, res, cache_reply);
710 return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
711 args, res);
712}
713
714static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
715{
716 struct nfs_inode *nfsi = NFS_I(dir);
717
718 spin_lock(&dir->i_lock);
719 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
720 if (!cinfo->atomic || cinfo->before != dir->i_version)
721 nfs_force_lookup_revalidate(dir);
722 dir->i_version = cinfo->after;
723 spin_unlock(&dir->i_lock);
724}
725
726struct nfs4_opendata {
727 struct kref kref;
728 struct nfs_openargs o_arg;
729 struct nfs_openres o_res;
730 struct nfs_open_confirmargs c_arg;
731 struct nfs_open_confirmres c_res;
732 struct nfs4_string owner_name;
733 struct nfs4_string group_name;
734 struct nfs_fattr f_attr;
735 struct dentry *dir;
736 struct dentry *dentry;
737 struct nfs4_state_owner *owner;
738 struct nfs4_state *state;
739 struct iattr attrs;
740 unsigned long timestamp;
741 unsigned int rpc_done : 1;
742 int rpc_status;
743 int cancelled;
744};
745
746
747static void nfs4_init_opendata_res(struct nfs4_opendata *p)
748{
749 p->o_res.f_attr = &p->f_attr;
750 p->o_res.seqid = p->o_arg.seqid;
751 p->c_res.seqid = p->c_arg.seqid;
752 p->o_res.server = p->o_arg.server;
753 p->o_res.access_request = p->o_arg.access;
754 nfs_fattr_init(&p->f_attr);
755 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
756}
757
758static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
759 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
760 const struct iattr *attrs,
761 gfp_t gfp_mask)
762{
763 struct dentry *parent = dget_parent(dentry);
764 struct inode *dir = parent->d_inode;
765 struct nfs_server *server = NFS_SERVER(dir);
766 struct nfs4_opendata *p;
767
768 p = kzalloc(sizeof(*p), gfp_mask);
769 if (p == NULL)
770 goto err;
771 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
772 if (p->o_arg.seqid == NULL)
773 goto err_free;
774 nfs_sb_active(dentry->d_sb);
775 p->dentry = dget(dentry);
776 p->dir = parent;
777 p->owner = sp;
778 atomic_inc(&sp->so_count);
779 p->o_arg.fh = NFS_FH(dir);
780 p->o_arg.open_flags = flags;
781 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
782 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
783 * will return permission denied for all bits until close */
784 if (!(flags & O_EXCL)) {
785 /* ask server to check for all possible rights as results
786 * are cached */
787 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
788 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
789 }
790 p->o_arg.clientid = server->nfs_client->cl_clientid;
791 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
792 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
793 p->o_arg.name = &dentry->d_name;
794 p->o_arg.server = server;
795 p->o_arg.bitmask = server->attr_bitmask;
796 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
797 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
798 if (attrs != NULL && attrs->ia_valid != 0) {
799 __be32 verf[2];
800
801 p->o_arg.u.attrs = &p->attrs;
802 memcpy(&p->attrs, attrs, sizeof(p->attrs));
803
804 verf[0] = jiffies;
805 verf[1] = current->pid;
806 memcpy(p->o_arg.u.verifier.data, verf,
807 sizeof(p->o_arg.u.verifier.data));
808 }
809 p->c_arg.fh = &p->o_res.fh;
810 p->c_arg.stateid = &p->o_res.stateid;
811 p->c_arg.seqid = p->o_arg.seqid;
812 nfs4_init_opendata_res(p);
813 kref_init(&p->kref);
814 return p;
815err_free:
816 kfree(p);
817err:
818 dput(parent);
819 return NULL;
820}
821
822static void nfs4_opendata_free(struct kref *kref)
823{
824 struct nfs4_opendata *p = container_of(kref,
825 struct nfs4_opendata, kref);
826 struct super_block *sb = p->dentry->d_sb;
827
828 nfs_free_seqid(p->o_arg.seqid);
829 if (p->state != NULL)
830 nfs4_put_open_state(p->state);
831 nfs4_put_state_owner(p->owner);
832 dput(p->dir);
833 dput(p->dentry);
834 nfs_sb_deactive(sb);
835 nfs_fattr_free_names(&p->f_attr);
836 kfree(p);
837}
838
839static void nfs4_opendata_put(struct nfs4_opendata *p)
840{
841 if (p != NULL)
842 kref_put(&p->kref, nfs4_opendata_free);
843}
844
845static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
846{
847 int ret;
848
849 ret = rpc_wait_for_completion_task(task);
850 return ret;
851}
852
853static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
854{
855 int ret = 0;
856
857 if (open_mode & (O_EXCL|O_TRUNC))
858 goto out;
859 switch (mode & (FMODE_READ|FMODE_WRITE)) {
860 case FMODE_READ:
861 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
862 && state->n_rdonly != 0;
863 break;
864 case FMODE_WRITE:
865 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
866 && state->n_wronly != 0;
867 break;
868 case FMODE_READ|FMODE_WRITE:
869 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
870 && state->n_rdwr != 0;
871 }
872out:
873 return ret;
874}
875
876static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
877{
878 if (delegation == NULL)
879 return 0;
880 if ((delegation->type & fmode) != fmode)
881 return 0;
882 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
883 return 0;
884 nfs_mark_delegation_referenced(delegation);
885 return 1;
886}
887
888static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
889{
890 switch (fmode) {
891 case FMODE_WRITE:
892 state->n_wronly++;
893 break;
894 case FMODE_READ:
895 state->n_rdonly++;
896 break;
897 case FMODE_READ|FMODE_WRITE:
898 state->n_rdwr++;
899 }
900 nfs4_state_set_mode_locked(state, state->state | fmode);
901}
902
903static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
904{
905 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
906 nfs4_stateid_copy(&state->stateid, stateid);
907 nfs4_stateid_copy(&state->open_stateid, stateid);
908 switch (fmode) {
909 case FMODE_READ:
910 set_bit(NFS_O_RDONLY_STATE, &state->flags);
911 break;
912 case FMODE_WRITE:
913 set_bit(NFS_O_WRONLY_STATE, &state->flags);
914 break;
915 case FMODE_READ|FMODE_WRITE:
916 set_bit(NFS_O_RDWR_STATE, &state->flags);
917 }
918}
919
920static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
921{
922 write_seqlock(&state->seqlock);
923 nfs_set_open_stateid_locked(state, stateid, fmode);
924 write_sequnlock(&state->seqlock);
925}
926
927static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
928{
929 /*
930 * Protect the call to nfs4_state_set_mode_locked and
931 * serialise the stateid update
932 */
933 write_seqlock(&state->seqlock);
934 if (deleg_stateid != NULL) {
935 nfs4_stateid_copy(&state->stateid, deleg_stateid);
936 set_bit(NFS_DELEGATED_STATE, &state->flags);
937 }
938 if (open_stateid != NULL)
939 nfs_set_open_stateid_locked(state, open_stateid, fmode);
940 write_sequnlock(&state->seqlock);
941 spin_lock(&state->owner->so_lock);
942 update_open_stateflags(state, fmode);
943 spin_unlock(&state->owner->so_lock);
944}
945
946static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
947{
948 struct nfs_inode *nfsi = NFS_I(state->inode);
949 struct nfs_delegation *deleg_cur;
950 int ret = 0;
951
952 fmode &= (FMODE_READ|FMODE_WRITE);
953
954 rcu_read_lock();
955 deleg_cur = rcu_dereference(nfsi->delegation);
956 if (deleg_cur == NULL)
957 goto no_delegation;
958
959 spin_lock(&deleg_cur->lock);
960 if (nfsi->delegation != deleg_cur ||
961 (deleg_cur->type & fmode) != fmode)
962 goto no_delegation_unlock;
963
964 if (delegation == NULL)
965 delegation = &deleg_cur->stateid;
966 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
967 goto no_delegation_unlock;
968
969 nfs_mark_delegation_referenced(deleg_cur);
970 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
971 ret = 1;
972no_delegation_unlock:
973 spin_unlock(&deleg_cur->lock);
974no_delegation:
975 rcu_read_unlock();
976
977 if (!ret && open_stateid != NULL) {
978 __update_open_stateid(state, open_stateid, NULL, fmode);
979 ret = 1;
980 }
981
982 return ret;
983}
984
985
986static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
987{
988 struct nfs_delegation *delegation;
989
990 rcu_read_lock();
991 delegation = rcu_dereference(NFS_I(inode)->delegation);
992 if (delegation == NULL || (delegation->type & fmode) == fmode) {
993 rcu_read_unlock();
994 return;
995 }
996 rcu_read_unlock();
997 nfs4_inode_return_delegation(inode);
998}
999
1000static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1001{
1002 struct nfs4_state *state = opendata->state;
1003 struct nfs_inode *nfsi = NFS_I(state->inode);
1004 struct nfs_delegation *delegation;
1005 int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1006 fmode_t fmode = opendata->o_arg.fmode;
1007 nfs4_stateid stateid;
1008 int ret = -EAGAIN;
1009
1010 for (;;) {
1011 if (can_open_cached(state, fmode, open_mode)) {
1012 spin_lock(&state->owner->so_lock);
1013 if (can_open_cached(state, fmode, open_mode)) {
1014 update_open_stateflags(state, fmode);
1015 spin_unlock(&state->owner->so_lock);
1016 goto out_return_state;
1017 }
1018 spin_unlock(&state->owner->so_lock);
1019 }
1020 rcu_read_lock();
1021 delegation = rcu_dereference(nfsi->delegation);
1022 if (!can_open_delegated(delegation, fmode)) {
1023 rcu_read_unlock();
1024 break;
1025 }
1026 /* Save the delegation */
1027 nfs4_stateid_copy(&stateid, &delegation->stateid);
1028 rcu_read_unlock();
1029 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1030 if (ret != 0)
1031 goto out;
1032 ret = -EAGAIN;
1033
1034 /* Try to update the stateid using the delegation */
1035 if (update_open_stateid(state, NULL, &stateid, fmode))
1036 goto out_return_state;
1037 }
1038out:
1039 return ERR_PTR(ret);
1040out_return_state:
1041 atomic_inc(&state->count);
1042 return state;
1043}
1044
1045static void
1046nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1047{
1048 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1049 struct nfs_delegation *delegation;
1050 int delegation_flags = 0;
1051
1052 rcu_read_lock();
1053 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1054 if (delegation)
1055 delegation_flags = delegation->flags;
1056 rcu_read_unlock();
1057 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1058 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1059 "returning a delegation for "
1060 "OPEN(CLAIM_DELEGATE_CUR)\n",
1061 clp->cl_hostname);
1062 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1063 nfs_inode_set_delegation(state->inode,
1064 data->owner->so_cred,
1065 &data->o_res);
1066 else
1067 nfs_inode_reclaim_delegation(state->inode,
1068 data->owner->so_cred,
1069 &data->o_res);
1070}
1071
1072/*
1073 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1074 * and update the nfs4_state.
1075 */
1076static struct nfs4_state *
1077_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1078{
1079 struct inode *inode = data->state->inode;
1080 struct nfs4_state *state = data->state;
1081 int ret;
1082
1083 if (!data->rpc_done) {
1084 ret = data->rpc_status;
1085 goto err;
1086 }
1087
1088 ret = -ESTALE;
1089 if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1090 !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1091 !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1092 goto err;
1093
1094 ret = -ENOMEM;
1095 state = nfs4_get_open_state(inode, data->owner);
1096 if (state == NULL)
1097 goto err;
1098
1099 ret = nfs_refresh_inode(inode, &data->f_attr);
1100 if (ret)
1101 goto err;
1102
1103 if (data->o_res.delegation_type != 0)
1104 nfs4_opendata_check_deleg(data, state);
1105 update_open_stateid(state, &data->o_res.stateid, NULL,
1106 data->o_arg.fmode);
1107
1108 return state;
1109err:
1110 return ERR_PTR(ret);
1111
1112}
1113
1114static struct nfs4_state *
1115_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1116{
1117 struct inode *inode;
1118 struct nfs4_state *state = NULL;
1119 int ret;
1120
1121 if (!data->rpc_done) {
1122 state = nfs4_try_open_cached(data);
1123 goto out;
1124 }
1125
1126 ret = -EAGAIN;
1127 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1128 goto err;
1129 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1130 ret = PTR_ERR(inode);
1131 if (IS_ERR(inode))
1132 goto err;
1133 ret = -ENOMEM;
1134 state = nfs4_get_open_state(inode, data->owner);
1135 if (state == NULL)
1136 goto err_put_inode;
1137 if (data->o_res.delegation_type != 0)
1138 nfs4_opendata_check_deleg(data, state);
1139 update_open_stateid(state, &data->o_res.stateid, NULL,
1140 data->o_arg.fmode);
1141 iput(inode);
1142out:
1143 return state;
1144err_put_inode:
1145 iput(inode);
1146err:
1147 return ERR_PTR(ret);
1148}
1149
1150static struct nfs4_state *
1151nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1152{
1153 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1154 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1155 return _nfs4_opendata_to_nfs4_state(data);
1156}
1157
1158static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1159{
1160 struct nfs_inode *nfsi = NFS_I(state->inode);
1161 struct nfs_open_context *ctx;
1162
1163 spin_lock(&state->inode->i_lock);
1164 list_for_each_entry(ctx, &nfsi->open_files, list) {
1165 if (ctx->state != state)
1166 continue;
1167 get_nfs_open_context(ctx);
1168 spin_unlock(&state->inode->i_lock);
1169 return ctx;
1170 }
1171 spin_unlock(&state->inode->i_lock);
1172 return ERR_PTR(-ENOENT);
1173}
1174
1175static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1176{
1177 struct nfs4_opendata *opendata;
1178
1179 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1180 if (opendata == NULL)
1181 return ERR_PTR(-ENOMEM);
1182 opendata->state = state;
1183 atomic_inc(&state->count);
1184 return opendata;
1185}
1186
1187static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1188{
1189 struct nfs4_state *newstate;
1190 int ret;
1191
1192 opendata->o_arg.open_flags = 0;
1193 opendata->o_arg.fmode = fmode;
1194 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1195 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1196 nfs4_init_opendata_res(opendata);
1197 ret = _nfs4_recover_proc_open(opendata);
1198 if (ret != 0)
1199 return ret;
1200 newstate = nfs4_opendata_to_nfs4_state(opendata);
1201 if (IS_ERR(newstate))
1202 return PTR_ERR(newstate);
1203 nfs4_close_state(newstate, fmode);
1204 *res = newstate;
1205 return 0;
1206}
1207
1208static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1209{
1210 struct nfs4_state *newstate;
1211 int ret;
1212
1213 /* memory barrier prior to reading state->n_* */
1214 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1215 smp_rmb();
1216 if (state->n_rdwr != 0) {
1217 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1218 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1219 if (ret != 0)
1220 return ret;
1221 if (newstate != state)
1222 return -ESTALE;
1223 }
1224 if (state->n_wronly != 0) {
1225 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1226 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1227 if (ret != 0)
1228 return ret;
1229 if (newstate != state)
1230 return -ESTALE;
1231 }
1232 if (state->n_rdonly != 0) {
1233 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1234 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1235 if (ret != 0)
1236 return ret;
1237 if (newstate != state)
1238 return -ESTALE;
1239 }
1240 /*
1241 * We may have performed cached opens for all three recoveries.
1242 * Check if we need to update the current stateid.
1243 */
1244 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1245 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1246 write_seqlock(&state->seqlock);
1247 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1248 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1249 write_sequnlock(&state->seqlock);
1250 }
1251 return 0;
1252}
1253
1254/*
1255 * OPEN_RECLAIM:
1256 * reclaim state on the server after a reboot.
1257 */
1258static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1259{
1260 struct nfs_delegation *delegation;
1261 struct nfs4_opendata *opendata;
1262 fmode_t delegation_type = 0;
1263 int status;
1264
1265 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1266 if (IS_ERR(opendata))
1267 return PTR_ERR(opendata);
1268 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1269 opendata->o_arg.fh = NFS_FH(state->inode);
1270 rcu_read_lock();
1271 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1272 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1273 delegation_type = delegation->type;
1274 rcu_read_unlock();
1275 opendata->o_arg.u.delegation_type = delegation_type;
1276 status = nfs4_open_recover(opendata, state);
1277 nfs4_opendata_put(opendata);
1278 return status;
1279}
1280
1281static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1282{
1283 struct nfs_server *server = NFS_SERVER(state->inode);
1284 struct nfs4_exception exception = { };
1285 int err;
1286 do {
1287 err = _nfs4_do_open_reclaim(ctx, state);
1288 if (err != -NFS4ERR_DELAY)
1289 break;
1290 nfs4_handle_exception(server, err, &exception);
1291 } while (exception.retry);
1292 return err;
1293}
1294
1295static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1296{
1297 struct nfs_open_context *ctx;
1298 int ret;
1299
1300 ctx = nfs4_state_find_open_context(state);
1301 if (IS_ERR(ctx))
1302 return PTR_ERR(ctx);
1303 ret = nfs4_do_open_reclaim(ctx, state);
1304 put_nfs_open_context(ctx);
1305 return ret;
1306}
1307
1308static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1309{
1310 struct nfs4_opendata *opendata;
1311 int ret;
1312
1313 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1314 if (IS_ERR(opendata))
1315 return PTR_ERR(opendata);
1316 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1317 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1318 ret = nfs4_open_recover(opendata, state);
1319 nfs4_opendata_put(opendata);
1320 return ret;
1321}
1322
1323int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1324{
1325 struct nfs4_exception exception = { };
1326 struct nfs_server *server = NFS_SERVER(state->inode);
1327 int err;
1328 do {
1329 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1330 switch (err) {
1331 case 0:
1332 case -ENOENT:
1333 case -ESTALE:
1334 goto out;
1335 case -NFS4ERR_BADSESSION:
1336 case -NFS4ERR_BADSLOT:
1337 case -NFS4ERR_BAD_HIGH_SLOT:
1338 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1339 case -NFS4ERR_DEADSESSION:
1340 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1341 goto out;
1342 case -NFS4ERR_STALE_CLIENTID:
1343 case -NFS4ERR_STALE_STATEID:
1344 case -NFS4ERR_EXPIRED:
1345 /* Don't recall a delegation if it was lost */
1346 nfs4_schedule_lease_recovery(server->nfs_client);
1347 goto out;
1348 case -ERESTARTSYS:
1349 /*
1350 * The show must go on: exit, but mark the
1351 * stateid as needing recovery.
1352 */
1353 case -NFS4ERR_DELEG_REVOKED:
1354 case -NFS4ERR_ADMIN_REVOKED:
1355 case -NFS4ERR_BAD_STATEID:
1356 nfs_inode_find_state_and_recover(state->inode,
1357 stateid);
1358 nfs4_schedule_stateid_recovery(server, state);
1359 case -EKEYEXPIRED:
1360 /*
1361 * User RPCSEC_GSS context has expired.
1362 * We cannot recover this stateid now, so
1363 * skip it and allow recovery thread to
1364 * proceed.
1365 */
1366 case -ENOMEM:
1367 err = 0;
1368 goto out;
1369 }
1370 err = nfs4_handle_exception(server, err, &exception);
1371 } while (exception.retry);
1372out:
1373 return err;
1374}
1375
1376static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1377{
1378 struct nfs4_opendata *data = calldata;
1379
1380 data->rpc_status = task->tk_status;
1381 if (data->rpc_status == 0) {
1382 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1383 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1384 renew_lease(data->o_res.server, data->timestamp);
1385 data->rpc_done = 1;
1386 }
1387}
1388
1389static void nfs4_open_confirm_release(void *calldata)
1390{
1391 struct nfs4_opendata *data = calldata;
1392 struct nfs4_state *state = NULL;
1393
1394 /* If this request hasn't been cancelled, do nothing */
1395 if (data->cancelled == 0)
1396 goto out_free;
1397 /* In case of error, no cleanup! */
1398 if (!data->rpc_done)
1399 goto out_free;
1400 state = nfs4_opendata_to_nfs4_state(data);
1401 if (!IS_ERR(state))
1402 nfs4_close_state(state, data->o_arg.fmode);
1403out_free:
1404 nfs4_opendata_put(data);
1405}
1406
1407static const struct rpc_call_ops nfs4_open_confirm_ops = {
1408 .rpc_call_done = nfs4_open_confirm_done,
1409 .rpc_release = nfs4_open_confirm_release,
1410};
1411
1412/*
1413 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1414 */
1415static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1416{
1417 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1418 struct rpc_task *task;
1419 struct rpc_message msg = {
1420 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1421 .rpc_argp = &data->c_arg,
1422 .rpc_resp = &data->c_res,
1423 .rpc_cred = data->owner->so_cred,
1424 };
1425 struct rpc_task_setup task_setup_data = {
1426 .rpc_client = server->client,
1427 .rpc_message = &msg,
1428 .callback_ops = &nfs4_open_confirm_ops,
1429 .callback_data = data,
1430 .workqueue = nfsiod_workqueue,
1431 .flags = RPC_TASK_ASYNC,
1432 };
1433 int status;
1434
1435 kref_get(&data->kref);
1436 data->rpc_done = 0;
1437 data->rpc_status = 0;
1438 data->timestamp = jiffies;
1439 task = rpc_run_task(&task_setup_data);
1440 if (IS_ERR(task))
1441 return PTR_ERR(task);
1442 status = nfs4_wait_for_completion_rpc_task(task);
1443 if (status != 0) {
1444 data->cancelled = 1;
1445 smp_wmb();
1446 } else
1447 status = data->rpc_status;
1448 rpc_put_task(task);
1449 return status;
1450}
1451
1452static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1453{
1454 struct nfs4_opendata *data = calldata;
1455 struct nfs4_state_owner *sp = data->owner;
1456
1457 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1458 return;
1459 /*
1460 * Check if we still need to send an OPEN call, or if we can use
1461 * a delegation instead.
1462 */
1463 if (data->state != NULL) {
1464 struct nfs_delegation *delegation;
1465
1466 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1467 goto out_no_action;
1468 rcu_read_lock();
1469 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1470 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1471 can_open_delegated(delegation, data->o_arg.fmode))
1472 goto unlock_no_action;
1473 rcu_read_unlock();
1474 }
1475 /* Update client id. */
1476 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1477 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1478 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1479 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1480 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1481 }
1482 data->timestamp = jiffies;
1483 if (nfs4_setup_sequence(data->o_arg.server,
1484 &data->o_arg.seq_args,
1485 &data->o_res.seq_res,
1486 task) != 0)
1487 nfs_release_seqid(data->o_arg.seqid);
1488 return;
1489unlock_no_action:
1490 rcu_read_unlock();
1491out_no_action:
1492 task->tk_action = NULL;
1493
1494}
1495
1496static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1497{
1498 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1499 nfs4_open_prepare(task, calldata);
1500}
1501
1502static void nfs4_open_done(struct rpc_task *task, void *calldata)
1503{
1504 struct nfs4_opendata *data = calldata;
1505
1506 data->rpc_status = task->tk_status;
1507
1508 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1509 return;
1510
1511 if (task->tk_status == 0) {
1512 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1513 switch (data->o_res.f_attr->mode & S_IFMT) {
1514 case S_IFREG:
1515 break;
1516 case S_IFLNK:
1517 data->rpc_status = -ELOOP;
1518 break;
1519 case S_IFDIR:
1520 data->rpc_status = -EISDIR;
1521 break;
1522 default:
1523 data->rpc_status = -ENOTDIR;
1524 }
1525 }
1526 renew_lease(data->o_res.server, data->timestamp);
1527 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1528 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1529 }
1530 data->rpc_done = 1;
1531}
1532
1533static void nfs4_open_release(void *calldata)
1534{
1535 struct nfs4_opendata *data = calldata;
1536 struct nfs4_state *state = NULL;
1537
1538 /* If this request hasn't been cancelled, do nothing */
1539 if (data->cancelled == 0)
1540 goto out_free;
1541 /* In case of error, no cleanup! */
1542 if (data->rpc_status != 0 || !data->rpc_done)
1543 goto out_free;
1544 /* In case we need an open_confirm, no cleanup! */
1545 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1546 goto out_free;
1547 state = nfs4_opendata_to_nfs4_state(data);
1548 if (!IS_ERR(state))
1549 nfs4_close_state(state, data->o_arg.fmode);
1550out_free:
1551 nfs4_opendata_put(data);
1552}
1553
1554static const struct rpc_call_ops nfs4_open_ops = {
1555 .rpc_call_prepare = nfs4_open_prepare,
1556 .rpc_call_done = nfs4_open_done,
1557 .rpc_release = nfs4_open_release,
1558};
1559
1560static const struct rpc_call_ops nfs4_recover_open_ops = {
1561 .rpc_call_prepare = nfs4_recover_open_prepare,
1562 .rpc_call_done = nfs4_open_done,
1563 .rpc_release = nfs4_open_release,
1564};
1565
1566static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1567{
1568 struct inode *dir = data->dir->d_inode;
1569 struct nfs_server *server = NFS_SERVER(dir);
1570 struct nfs_openargs *o_arg = &data->o_arg;
1571 struct nfs_openres *o_res = &data->o_res;
1572 struct rpc_task *task;
1573 struct rpc_message msg = {
1574 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1575 .rpc_argp = o_arg,
1576 .rpc_resp = o_res,
1577 .rpc_cred = data->owner->so_cred,
1578 };
1579 struct rpc_task_setup task_setup_data = {
1580 .rpc_client = server->client,
1581 .rpc_message = &msg,
1582 .callback_ops = &nfs4_open_ops,
1583 .callback_data = data,
1584 .workqueue = nfsiod_workqueue,
1585 .flags = RPC_TASK_ASYNC,
1586 };
1587 int status;
1588
1589 nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1590 kref_get(&data->kref);
1591 data->rpc_done = 0;
1592 data->rpc_status = 0;
1593 data->cancelled = 0;
1594 if (isrecover)
1595 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1596 task = rpc_run_task(&task_setup_data);
1597 if (IS_ERR(task))
1598 return PTR_ERR(task);
1599 status = nfs4_wait_for_completion_rpc_task(task);
1600 if (status != 0) {
1601 data->cancelled = 1;
1602 smp_wmb();
1603 } else
1604 status = data->rpc_status;
1605 rpc_put_task(task);
1606
1607 return status;
1608}
1609
1610static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1611{
1612 struct inode *dir = data->dir->d_inode;
1613 struct nfs_openres *o_res = &data->o_res;
1614 int status;
1615
1616 status = nfs4_run_open_task(data, 1);
1617 if (status != 0 || !data->rpc_done)
1618 return status;
1619
1620 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1621
1622 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1623 status = _nfs4_proc_open_confirm(data);
1624 if (status != 0)
1625 return status;
1626 }
1627
1628 return status;
1629}
1630
1631static int nfs4_opendata_access(struct rpc_cred *cred,
1632 struct nfs4_opendata *opendata,
1633 struct nfs4_state *state, fmode_t fmode)
1634{
1635 struct nfs_access_entry cache;
1636 u32 mask;
1637
1638 /* access call failed or for some reason the server doesn't
1639 * support any access modes -- defer access call until later */
1640 if (opendata->o_res.access_supported == 0)
1641 return 0;
1642
1643 mask = 0;
1644 /* don't check MAY_WRITE - a newly created file may not have
1645 * write mode bits, but POSIX allows the creating process to write */
1646 if (fmode & FMODE_READ)
1647 mask |= MAY_READ;
1648 if (fmode & FMODE_EXEC)
1649 mask |= MAY_EXEC;
1650
1651 cache.cred = cred;
1652 cache.jiffies = jiffies;
1653 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1654 nfs_access_add_cache(state->inode, &cache);
1655
1656 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1657 return 0;
1658
1659 /* even though OPEN succeeded, access is denied. Close the file */
1660 nfs4_close_state(state, fmode);
1661 return -EACCES;
1662}
1663
1664/*
1665 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1666 */
1667static int _nfs4_proc_open(struct nfs4_opendata *data)
1668{
1669 struct inode *dir = data->dir->d_inode;
1670 struct nfs_server *server = NFS_SERVER(dir);
1671 struct nfs_openargs *o_arg = &data->o_arg;
1672 struct nfs_openres *o_res = &data->o_res;
1673 int status;
1674
1675 status = nfs4_run_open_task(data, 0);
1676 if (!data->rpc_done)
1677 return status;
1678 if (status != 0) {
1679 if (status == -NFS4ERR_BADNAME &&
1680 !(o_arg->open_flags & O_CREAT))
1681 return -ENOENT;
1682 return status;
1683 }
1684
1685 nfs_fattr_map_and_free_names(server, &data->f_attr);
1686
1687 if (o_arg->open_flags & O_CREAT)
1688 update_changeattr(dir, &o_res->cinfo);
1689 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1690 server->caps &= ~NFS_CAP_POSIX_LOCK;
1691 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1692 status = _nfs4_proc_open_confirm(data);
1693 if (status != 0)
1694 return status;
1695 }
1696 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1697 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1698 return 0;
1699}
1700
1701static int nfs4_recover_expired_lease(struct nfs_server *server)
1702{
1703 return nfs4_client_recover_expired_lease(server->nfs_client);
1704}
1705
1706/*
1707 * OPEN_EXPIRED:
1708 * reclaim state on the server after a network partition.
1709 * Assumes caller holds the appropriate lock
1710 */
1711static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1712{
1713 struct nfs4_opendata *opendata;
1714 int ret;
1715
1716 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1717 if (IS_ERR(opendata))
1718 return PTR_ERR(opendata);
1719 ret = nfs4_open_recover(opendata, state);
1720 if (ret == -ESTALE)
1721 d_drop(ctx->dentry);
1722 nfs4_opendata_put(opendata);
1723 return ret;
1724}
1725
1726static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1727{
1728 struct nfs_server *server = NFS_SERVER(state->inode);
1729 struct nfs4_exception exception = { };
1730 int err;
1731
1732 do {
1733 err = _nfs4_open_expired(ctx, state);
1734 switch (err) {
1735 default:
1736 goto out;
1737 case -NFS4ERR_GRACE:
1738 case -NFS4ERR_DELAY:
1739 nfs4_handle_exception(server, err, &exception);
1740 err = 0;
1741 }
1742 } while (exception.retry);
1743out:
1744 return err;
1745}
1746
1747static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1748{
1749 struct nfs_open_context *ctx;
1750 int ret;
1751
1752 ctx = nfs4_state_find_open_context(state);
1753 if (IS_ERR(ctx))
1754 return PTR_ERR(ctx);
1755 ret = nfs4_do_open_expired(ctx, state);
1756 put_nfs_open_context(ctx);
1757 return ret;
1758}
1759
1760#if defined(CONFIG_NFS_V4_1)
1761static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1762{
1763 struct nfs_server *server = NFS_SERVER(state->inode);
1764 nfs4_stateid *stateid = &state->stateid;
1765 int status;
1766
1767 /* If a state reset has been done, test_stateid is unneeded */
1768 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1769 return;
1770
1771 status = nfs41_test_stateid(server, stateid);
1772 if (status != NFS_OK) {
1773 /* Free the stateid unless the server explicitly
1774 * informs us the stateid is unrecognized. */
1775 if (status != -NFS4ERR_BAD_STATEID)
1776 nfs41_free_stateid(server, stateid);
1777 nfs_remove_bad_delegation(state->inode);
1778
1779 write_seqlock(&state->seqlock);
1780 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1781 write_sequnlock(&state->seqlock);
1782 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1783 }
1784}
1785
1786/**
1787 * nfs41_check_open_stateid - possibly free an open stateid
1788 *
1789 * @state: NFSv4 state for an inode
1790 *
1791 * Returns NFS_OK if recovery for this stateid is now finished.
1792 * Otherwise a negative NFS4ERR value is returned.
1793 */
1794static int nfs41_check_open_stateid(struct nfs4_state *state)
1795{
1796 struct nfs_server *server = NFS_SERVER(state->inode);
1797 nfs4_stateid *stateid = &state->open_stateid;
1798 int status;
1799
1800 /* If a state reset has been done, test_stateid is unneeded */
1801 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1802 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1803 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1804 return -NFS4ERR_BAD_STATEID;
1805
1806 status = nfs41_test_stateid(server, stateid);
1807 if (status != NFS_OK) {
1808 /* Free the stateid unless the server explicitly
1809 * informs us the stateid is unrecognized. */
1810 if (status != -NFS4ERR_BAD_STATEID)
1811 nfs41_free_stateid(server, stateid);
1812
1813 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1814 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1815 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1816 }
1817 return status;
1818}
1819
1820static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1821{
1822 int status;
1823
1824 nfs41_clear_delegation_stateid(state);
1825 status = nfs41_check_open_stateid(state);
1826 if (status != NFS_OK)
1827 status = nfs4_open_expired(sp, state);
1828 return status;
1829}
1830#endif
1831
1832/*
1833 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1834 * fields corresponding to attributes that were used to store the verifier.
1835 * Make sure we clobber those fields in the later setattr call
1836 */
1837static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1838{
1839 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1840 !(sattr->ia_valid & ATTR_ATIME_SET))
1841 sattr->ia_valid |= ATTR_ATIME;
1842
1843 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1844 !(sattr->ia_valid & ATTR_MTIME_SET))
1845 sattr->ia_valid |= ATTR_MTIME;
1846}
1847
1848/*
1849 * Returns a referenced nfs4_state
1850 */
1851static int _nfs4_do_open(struct inode *dir,
1852 struct dentry *dentry,
1853 fmode_t fmode,
1854 int flags,
1855 struct iattr *sattr,
1856 struct rpc_cred *cred,
1857 struct nfs4_state **res,
1858 struct nfs4_threshold **ctx_th)
1859{
1860 struct nfs4_state_owner *sp;
1861 struct nfs4_state *state = NULL;
1862 struct nfs_server *server = NFS_SERVER(dir);
1863 struct nfs4_opendata *opendata;
1864 int status;
1865
1866 /* Protect against reboot recovery conflicts */
1867 status = -ENOMEM;
1868 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1869 if (sp == NULL) {
1870 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1871 goto out_err;
1872 }
1873 status = nfs4_recover_expired_lease(server);
1874 if (status != 0)
1875 goto err_put_state_owner;
1876 if (dentry->d_inode != NULL)
1877 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1878 status = -ENOMEM;
1879 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1880 if (opendata == NULL)
1881 goto err_put_state_owner;
1882
1883 if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1884 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1885 if (!opendata->f_attr.mdsthreshold)
1886 goto err_opendata_put;
1887 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1888 }
1889 if (dentry->d_inode != NULL)
1890 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1891
1892 status = _nfs4_proc_open(opendata);
1893 if (status != 0)
1894 goto err_opendata_put;
1895
1896 state = nfs4_opendata_to_nfs4_state(opendata);
1897 status = PTR_ERR(state);
1898 if (IS_ERR(state))
1899 goto err_opendata_put;
1900 if (server->caps & NFS_CAP_POSIX_LOCK)
1901 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1902
1903 status = nfs4_opendata_access(cred, opendata, state, fmode);
1904 if (status != 0)
1905 goto err_opendata_put;
1906
1907 if (opendata->o_arg.open_flags & O_EXCL) {
1908 nfs4_exclusive_attrset(opendata, sattr);
1909
1910 nfs_fattr_init(opendata->o_res.f_attr);
1911 status = nfs4_do_setattr(state->inode, cred,
1912 opendata->o_res.f_attr, sattr,
1913 state);
1914 if (status == 0)
1915 nfs_setattr_update_inode(state->inode, sattr);
1916 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1917 }
1918
1919 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1920 *ctx_th = opendata->f_attr.mdsthreshold;
1921 else
1922 kfree(opendata->f_attr.mdsthreshold);
1923 opendata->f_attr.mdsthreshold = NULL;
1924
1925 nfs4_opendata_put(opendata);
1926 nfs4_put_state_owner(sp);
1927 *res = state;
1928 return 0;
1929err_opendata_put:
1930 kfree(opendata->f_attr.mdsthreshold);
1931 nfs4_opendata_put(opendata);
1932err_put_state_owner:
1933 nfs4_put_state_owner(sp);
1934out_err:
1935 *res = NULL;
1936 return status;
1937}
1938
1939
1940static struct nfs4_state *nfs4_do_open(struct inode *dir,
1941 struct dentry *dentry,
1942 fmode_t fmode,
1943 int flags,
1944 struct iattr *sattr,
1945 struct rpc_cred *cred,
1946 struct nfs4_threshold **ctx_th)
1947{
1948 struct nfs4_exception exception = { };
1949 struct nfs4_state *res;
1950 int status;
1951
1952 fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1953 do {
1954 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1955 &res, ctx_th);
1956 if (status == 0)
1957 break;
1958 /* NOTE: BAD_SEQID means the server and client disagree about the
1959 * book-keeping w.r.t. state-changing operations
1960 * (OPEN/CLOSE/LOCK/LOCKU...)
1961 * It is actually a sign of a bug on the client or on the server.
1962 *
1963 * If we receive a BAD_SEQID error in the particular case of
1964 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1965 * have unhashed the old state_owner for us, and that we can
1966 * therefore safely retry using a new one. We should still warn
1967 * the user though...
1968 */
1969 if (status == -NFS4ERR_BAD_SEQID) {
1970 pr_warn_ratelimited("NFS: v4 server %s "
1971 " returned a bad sequence-id error!\n",
1972 NFS_SERVER(dir)->nfs_client->cl_hostname);
1973 exception.retry = 1;
1974 continue;
1975 }
1976 /*
1977 * BAD_STATEID on OPEN means that the server cancelled our
1978 * state before it received the OPEN_CONFIRM.
1979 * Recover by retrying the request as per the discussion
1980 * on Page 181 of RFC3530.
1981 */
1982 if (status == -NFS4ERR_BAD_STATEID) {
1983 exception.retry = 1;
1984 continue;
1985 }
1986 if (status == -EAGAIN) {
1987 /* We must have found a delegation */
1988 exception.retry = 1;
1989 continue;
1990 }
1991 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1992 status, &exception));
1993 } while (exception.retry);
1994 return res;
1995}
1996
1997static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1998 struct nfs_fattr *fattr, struct iattr *sattr,
1999 struct nfs4_state *state)
2000{
2001 struct nfs_server *server = NFS_SERVER(inode);
2002 struct nfs_setattrargs arg = {
2003 .fh = NFS_FH(inode),
2004 .iap = sattr,
2005 .server = server,
2006 .bitmask = server->attr_bitmask,
2007 };
2008 struct nfs_setattrres res = {
2009 .fattr = fattr,
2010 .server = server,
2011 };
2012 struct rpc_message msg = {
2013 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2014 .rpc_argp = &arg,
2015 .rpc_resp = &res,
2016 .rpc_cred = cred,
2017 };
2018 unsigned long timestamp = jiffies;
2019 int status;
2020
2021 nfs_fattr_init(fattr);
2022
2023 if (state != NULL) {
2024 struct nfs_lockowner lockowner = {
2025 .l_owner = current->files,
2026 .l_pid = current->tgid,
2027 };
2028 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2029 &lockowner);
2030 } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2031 FMODE_WRITE)) {
2032 /* Use that stateid */
2033 } else
2034 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2035
2036 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2037 if (status == 0 && state != NULL)
2038 renew_lease(server, timestamp);
2039 return status;
2040}
2041
2042static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2043 struct nfs_fattr *fattr, struct iattr *sattr,
2044 struct nfs4_state *state)
2045{
2046 struct nfs_server *server = NFS_SERVER(inode);
2047 struct nfs4_exception exception = {
2048 .state = state,
2049 .inode = inode,
2050 };
2051 int err;
2052 do {
2053 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2054 switch (err) {
2055 case -NFS4ERR_OPENMODE:
2056 if (state && !(state->state & FMODE_WRITE)) {
2057 err = -EBADF;
2058 if (sattr->ia_valid & ATTR_OPEN)
2059 err = -EACCES;
2060 goto out;
2061 }
2062 }
2063 err = nfs4_handle_exception(server, err, &exception);
2064 } while (exception.retry);
2065out:
2066 return err;
2067}
2068
2069struct nfs4_closedata {
2070 struct inode *inode;
2071 struct nfs4_state *state;
2072 struct nfs_closeargs arg;
2073 struct nfs_closeres res;
2074 struct nfs_fattr fattr;
2075 unsigned long timestamp;
2076 bool roc;
2077 u32 roc_barrier;
2078};
2079
2080static void nfs4_free_closedata(void *data)
2081{
2082 struct nfs4_closedata *calldata = data;
2083 struct nfs4_state_owner *sp = calldata->state->owner;
2084 struct super_block *sb = calldata->state->inode->i_sb;
2085
2086 if (calldata->roc)
2087 pnfs_roc_release(calldata->state->inode);
2088 nfs4_put_open_state(calldata->state);
2089 nfs_free_seqid(calldata->arg.seqid);
2090 nfs4_put_state_owner(sp);
2091 nfs_sb_deactive_async(sb);
2092 kfree(calldata);
2093}
2094
2095static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2096 fmode_t fmode)
2097{
2098 spin_lock(&state->owner->so_lock);
2099 if (!(fmode & FMODE_READ))
2100 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2101 if (!(fmode & FMODE_WRITE))
2102 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2103 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2104 spin_unlock(&state->owner->so_lock);
2105}
2106
2107static void nfs4_close_done(struct rpc_task *task, void *data)
2108{
2109 struct nfs4_closedata *calldata = data;
2110 struct nfs4_state *state = calldata->state;
2111 struct nfs_server *server = NFS_SERVER(calldata->inode);
2112
2113 dprintk("%s: begin!\n", __func__);
2114 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2115 return;
2116 /* hmm. we are done with the inode, and in the process of freeing
2117 * the state_owner. we keep this around to process errors
2118 */
2119 switch (task->tk_status) {
2120 case 0:
2121 if (calldata->roc)
2122 pnfs_roc_set_barrier(state->inode,
2123 calldata->roc_barrier);
2124 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2125 renew_lease(server, calldata->timestamp);
2126 nfs4_close_clear_stateid_flags(state,
2127 calldata->arg.fmode);
2128 break;
2129 case -NFS4ERR_STALE_STATEID:
2130 case -NFS4ERR_OLD_STATEID:
2131 case -NFS4ERR_BAD_STATEID:
2132 case -NFS4ERR_EXPIRED:
2133 if (calldata->arg.fmode == 0)
2134 break;
2135 default:
2136 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2137 rpc_restart_call_prepare(task);
2138 }
2139 nfs_release_seqid(calldata->arg.seqid);
2140 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2141 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2142}
2143
2144static void nfs4_close_prepare(struct rpc_task *task, void *data)
2145{
2146 struct nfs4_closedata *calldata = data;
2147 struct nfs4_state *state = calldata->state;
2148 struct inode *inode = calldata->inode;
2149 int call_close = 0;
2150
2151 dprintk("%s: begin!\n", __func__);
2152 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2153 return;
2154
2155 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2156 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2157 spin_lock(&state->owner->so_lock);
2158 /* Calculate the change in open mode */
2159 if (state->n_rdwr == 0) {
2160 if (state->n_rdonly == 0) {
2161 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2162 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2163 calldata->arg.fmode &= ~FMODE_READ;
2164 }
2165 if (state->n_wronly == 0) {
2166 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2167 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2168 calldata->arg.fmode &= ~FMODE_WRITE;
2169 }
2170 }
2171 spin_unlock(&state->owner->so_lock);
2172
2173 if (!call_close) {
2174 /* Note: exit _without_ calling nfs4_close_done */
2175 task->tk_action = NULL;
2176 goto out;
2177 }
2178
2179 if (calldata->arg.fmode == 0) {
2180 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2181 if (calldata->roc &&
2182 pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2183 goto out;
2184 }
2185
2186 nfs_fattr_init(calldata->res.fattr);
2187 calldata->timestamp = jiffies;
2188 if (nfs4_setup_sequence(NFS_SERVER(inode),
2189 &calldata->arg.seq_args,
2190 &calldata->res.seq_res,
2191 task) != 0)
2192 nfs_release_seqid(calldata->arg.seqid);
2193out:
2194 dprintk("%s: done!\n", __func__);
2195}
2196
2197static const struct rpc_call_ops nfs4_close_ops = {
2198 .rpc_call_prepare = nfs4_close_prepare,
2199 .rpc_call_done = nfs4_close_done,
2200 .rpc_release = nfs4_free_closedata,
2201};
2202
2203/*
2204 * It is possible for data to be read/written from a mem-mapped file
2205 * after the sys_close call (which hits the vfs layer as a flush).
2206 * This means that we can't safely call nfsv4 close on a file until
2207 * the inode is cleared. This in turn means that we are not good
2208 * NFSv4 citizens - we do not indicate to the server to update the file's
2209 * share state even when we are done with one of the three share
2210 * stateid's in the inode.
2211 *
2212 * NOTE: Caller must be holding the sp->so_owner semaphore!
2213 */
2214int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2215{
2216 struct nfs_server *server = NFS_SERVER(state->inode);
2217 struct nfs4_closedata *calldata;
2218 struct nfs4_state_owner *sp = state->owner;
2219 struct rpc_task *task;
2220 struct rpc_message msg = {
2221 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2222 .rpc_cred = state->owner->so_cred,
2223 };
2224 struct rpc_task_setup task_setup_data = {
2225 .rpc_client = server->client,
2226 .rpc_message = &msg,
2227 .callback_ops = &nfs4_close_ops,
2228 .workqueue = nfsiod_workqueue,
2229 .flags = RPC_TASK_ASYNC,
2230 };
2231 int status = -ENOMEM;
2232
2233 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2234 if (calldata == NULL)
2235 goto out;
2236 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2237 calldata->inode = state->inode;
2238 calldata->state = state;
2239 calldata->arg.fh = NFS_FH(state->inode);
2240 calldata->arg.stateid = &state->open_stateid;
2241 /* Serialization for the sequence id */
2242 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2243 if (calldata->arg.seqid == NULL)
2244 goto out_free_calldata;
2245 calldata->arg.fmode = 0;
2246 calldata->arg.bitmask = server->cache_consistency_bitmask;
2247 calldata->res.fattr = &calldata->fattr;
2248 calldata->res.seqid = calldata->arg.seqid;
2249 calldata->res.server = server;
2250 calldata->roc = pnfs_roc(state->inode);
2251 nfs_sb_active(calldata->inode->i_sb);
2252
2253 msg.rpc_argp = &calldata->arg;
2254 msg.rpc_resp = &calldata->res;
2255 task_setup_data.callback_data = calldata;
2256 task = rpc_run_task(&task_setup_data);
2257 if (IS_ERR(task))
2258 return PTR_ERR(task);
2259 status = 0;
2260 if (wait)
2261 status = rpc_wait_for_completion_task(task);
2262 rpc_put_task(task);
2263 return status;
2264out_free_calldata:
2265 kfree(calldata);
2266out:
2267 nfs4_put_open_state(state);
2268 nfs4_put_state_owner(sp);
2269 return status;
2270}
2271
2272static struct inode *
2273nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2274{
2275 struct nfs4_state *state;
2276
2277 /* Protect against concurrent sillydeletes */
2278 state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2279 ctx->cred, &ctx->mdsthreshold);
2280 if (IS_ERR(state))
2281 return ERR_CAST(state);
2282 ctx->state = state;
2283 return igrab(state->inode);
2284}
2285
2286static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2287{
2288 if (ctx->state == NULL)
2289 return;
2290 if (is_sync)
2291 nfs4_close_sync(ctx->state, ctx->mode);
2292 else
2293 nfs4_close_state(ctx->state, ctx->mode);
2294}
2295
2296static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2297{
2298 struct nfs4_server_caps_arg args = {
2299 .fhandle = fhandle,
2300 };
2301 struct nfs4_server_caps_res res = {};
2302 struct rpc_message msg = {
2303 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2304 .rpc_argp = &args,
2305 .rpc_resp = &res,
2306 };
2307 int status;
2308
2309 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2310 if (status == 0) {
2311 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2312 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2313 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2314 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2315 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2316 NFS_CAP_CTIME|NFS_CAP_MTIME);
2317 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2318 server->caps |= NFS_CAP_ACLS;
2319 if (res.has_links != 0)
2320 server->caps |= NFS_CAP_HARDLINKS;
2321 if (res.has_symlinks != 0)
2322 server->caps |= NFS_CAP_SYMLINKS;
2323 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2324 server->caps |= NFS_CAP_FILEID;
2325 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2326 server->caps |= NFS_CAP_MODE;
2327 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2328 server->caps |= NFS_CAP_NLINK;
2329 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2330 server->caps |= NFS_CAP_OWNER;
2331 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2332 server->caps |= NFS_CAP_OWNER_GROUP;
2333 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2334 server->caps |= NFS_CAP_ATIME;
2335 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2336 server->caps |= NFS_CAP_CTIME;
2337 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2338 server->caps |= NFS_CAP_MTIME;
2339
2340 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2341 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2342 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2343 server->acl_bitmask = res.acl_bitmask;
2344 server->fh_expire_type = res.fh_expire_type;
2345 }
2346
2347 return status;
2348}
2349
2350int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2351{
2352 struct nfs4_exception exception = { };
2353 int err;
2354 do {
2355 err = nfs4_handle_exception(server,
2356 _nfs4_server_capabilities(server, fhandle),
2357 &exception);
2358 } while (exception.retry);
2359 return err;
2360}
2361
2362static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2363 struct nfs_fsinfo *info)
2364{
2365 struct nfs4_lookup_root_arg args = {
2366 .bitmask = nfs4_fattr_bitmap,
2367 };
2368 struct nfs4_lookup_res res = {
2369 .server = server,
2370 .fattr = info->fattr,
2371 .fh = fhandle,
2372 };
2373 struct rpc_message msg = {
2374 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2375 .rpc_argp = &args,
2376 .rpc_resp = &res,
2377 };
2378
2379 nfs_fattr_init(info->fattr);
2380 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2381}
2382
2383static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2384 struct nfs_fsinfo *info)
2385{
2386 struct nfs4_exception exception = { };
2387 int err;
2388 do {
2389 err = _nfs4_lookup_root(server, fhandle, info);
2390 switch (err) {
2391 case 0:
2392 case -NFS4ERR_WRONGSEC:
2393 goto out;
2394 default:
2395 err = nfs4_handle_exception(server, err, &exception);
2396 }
2397 } while (exception.retry);
2398out:
2399 return err;
2400}
2401
2402static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2403 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2404{
2405 struct rpc_auth *auth;
2406 int ret;
2407
2408 auth = rpcauth_create(flavor, server->client);
2409 if (IS_ERR(auth)) {
2410 ret = -EIO;
2411 goto out;
2412 }
2413 ret = nfs4_lookup_root(server, fhandle, info);
2414out:
2415 return ret;
2416}
2417
2418static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2419 struct nfs_fsinfo *info)
2420{
2421 int i, len, status = 0;
2422 rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2423
2424 len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2425 if (len < 0)
2426 return len;
2427
2428 for (i = 0; i < len; i++) {
2429 /* AUTH_UNIX is the default flavor if none was specified,
2430 * thus has already been tried. */
2431 if (flav_array[i] == RPC_AUTH_UNIX)
2432 continue;
2433
2434 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2435 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2436 continue;
2437 break;
2438 }
2439 /*
2440 * -EACCESS could mean that the user doesn't have correct permissions
2441 * to access the mount. It could also mean that we tried to mount
2442 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2443 * existing mount programs don't handle -EACCES very well so it should
2444 * be mapped to -EPERM instead.
2445 */
2446 if (status == -EACCES)
2447 status = -EPERM;
2448 return status;
2449}
2450
2451/*
2452 * get the file handle for the "/" directory on the server
2453 */
2454int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2455 struct nfs_fsinfo *info)
2456{
2457 int minor_version = server->nfs_client->cl_minorversion;
2458 int status = nfs4_lookup_root(server, fhandle, info);
2459 if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2460 /*
2461 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2462 * by nfs4_map_errors() as this function exits.
2463 */
2464 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2465 if (status == 0)
2466 status = nfs4_server_capabilities(server, fhandle);
2467 if (status == 0)
2468 status = nfs4_do_fsinfo(server, fhandle, info);
2469 return nfs4_map_errors(status);
2470}
2471
2472static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2473 struct nfs_fsinfo *info)
2474{
2475 int error;
2476 struct nfs_fattr *fattr = info->fattr;
2477
2478 error = nfs4_server_capabilities(server, mntfh);
2479 if (error < 0) {
2480 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2481 return error;
2482 }
2483
2484 error = nfs4_proc_getattr(server, mntfh, fattr);
2485 if (error < 0) {
2486 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2487 return error;
2488 }
2489
2490 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2491 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2492 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2493
2494 return error;
2495}
2496
2497/*
2498 * Get locations and (maybe) other attributes of a referral.
2499 * Note that we'll actually follow the referral later when
2500 * we detect fsid mismatch in inode revalidation
2501 */
2502static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2503 const struct qstr *name, struct nfs_fattr *fattr,
2504 struct nfs_fh *fhandle)
2505{
2506 int status = -ENOMEM;
2507 struct page *page = NULL;
2508 struct nfs4_fs_locations *locations = NULL;
2509
2510 page = alloc_page(GFP_KERNEL);
2511 if (page == NULL)
2512 goto out;
2513 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2514 if (locations == NULL)
2515 goto out;
2516
2517 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2518 if (status != 0)
2519 goto out;
2520 /* Make sure server returned a different fsid for the referral */
2521 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2522 dprintk("%s: server did not return a different fsid for"
2523 " a referral at %s\n", __func__, name->name);
2524 status = -EIO;
2525 goto out;
2526 }
2527 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2528 nfs_fixup_referral_attributes(&locations->fattr);
2529
2530 /* replace the lookup nfs_fattr with the locations nfs_fattr */
2531 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2532 memset(fhandle, 0, sizeof(struct nfs_fh));
2533out:
2534 if (page)
2535 __free_page(page);
2536 kfree(locations);
2537 return status;
2538}
2539
2540static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2541{
2542 struct nfs4_getattr_arg args = {
2543 .fh = fhandle,
2544 .bitmask = server->attr_bitmask,
2545 };
2546 struct nfs4_getattr_res res = {
2547 .fattr = fattr,
2548 .server = server,
2549 };
2550 struct rpc_message msg = {
2551 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2552 .rpc_argp = &args,
2553 .rpc_resp = &res,
2554 };
2555
2556 nfs_fattr_init(fattr);
2557 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2558}
2559
2560static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2561{
2562 struct nfs4_exception exception = { };
2563 int err;
2564 do {
2565 err = nfs4_handle_exception(server,
2566 _nfs4_proc_getattr(server, fhandle, fattr),
2567 &exception);
2568 } while (exception.retry);
2569 return err;
2570}
2571
2572/*
2573 * The file is not closed if it is opened due to the a request to change
2574 * the size of the file. The open call will not be needed once the
2575 * VFS layer lookup-intents are implemented.
2576 *
2577 * Close is called when the inode is destroyed.
2578 * If we haven't opened the file for O_WRONLY, we
2579 * need to in the size_change case to obtain a stateid.
2580 *
2581 * Got race?
2582 * Because OPEN is always done by name in nfsv4, it is
2583 * possible that we opened a different file by the same
2584 * name. We can recognize this race condition, but we
2585 * can't do anything about it besides returning an error.
2586 *
2587 * This will be fixed with VFS changes (lookup-intent).
2588 */
2589static int
2590nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2591 struct iattr *sattr)
2592{
2593 struct inode *inode = dentry->d_inode;
2594 struct rpc_cred *cred = NULL;
2595 struct nfs4_state *state = NULL;
2596 int status;
2597
2598 if (pnfs_ld_layoutret_on_setattr(inode))
2599 pnfs_return_layout(inode);
2600
2601 nfs_fattr_init(fattr);
2602
2603 /* Deal with open(O_TRUNC) */
2604 if (sattr->ia_valid & ATTR_OPEN)
2605 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2606
2607 /* Optimization: if the end result is no change, don't RPC */
2608 if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2609 return 0;
2610
2611 /* Search for an existing open(O_WRITE) file */
2612 if (sattr->ia_valid & ATTR_FILE) {
2613 struct nfs_open_context *ctx;
2614
2615 ctx = nfs_file_open_context(sattr->ia_file);
2616 if (ctx) {
2617 cred = ctx->cred;
2618 state = ctx->state;
2619 }
2620 }
2621
2622 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2623 if (status == 0)
2624 nfs_setattr_update_inode(inode, sattr);
2625 return status;
2626}
2627
2628static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2629 const struct qstr *name, struct nfs_fh *fhandle,
2630 struct nfs_fattr *fattr)
2631{
2632 struct nfs_server *server = NFS_SERVER(dir);
2633 int status;
2634 struct nfs4_lookup_arg args = {
2635 .bitmask = server->attr_bitmask,
2636 .dir_fh = NFS_FH(dir),
2637 .name = name,
2638 };
2639 struct nfs4_lookup_res res = {
2640 .server = server,
2641 .fattr = fattr,
2642 .fh = fhandle,
2643 };
2644 struct rpc_message msg = {
2645 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2646 .rpc_argp = &args,
2647 .rpc_resp = &res,
2648 };
2649
2650 nfs_fattr_init(fattr);
2651
2652 dprintk("NFS call lookup %s\n", name->name);
2653 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2654 dprintk("NFS reply lookup: %d\n", status);
2655 return status;
2656}
2657
2658static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2659{
2660 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2661 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2662 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2663 fattr->nlink = 2;
2664}
2665
2666static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2667 struct qstr *name, struct nfs_fh *fhandle,
2668 struct nfs_fattr *fattr)
2669{
2670 struct nfs4_exception exception = { };
2671 struct rpc_clnt *client = *clnt;
2672 int err;
2673 do {
2674 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2675 switch (err) {
2676 case -NFS4ERR_BADNAME:
2677 err = -ENOENT;
2678 goto out;
2679 case -NFS4ERR_MOVED:
2680 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2681 goto out;
2682 case -NFS4ERR_WRONGSEC:
2683 err = -EPERM;
2684 if (client != *clnt)
2685 goto out;
2686
2687 client = nfs4_create_sec_client(client, dir, name);
2688 if (IS_ERR(client))
2689 return PTR_ERR(client);
2690
2691 exception.retry = 1;
2692 break;
2693 default:
2694 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2695 }
2696 } while (exception.retry);
2697
2698out:
2699 if (err == 0)
2700 *clnt = client;
2701 else if (client != *clnt)
2702 rpc_shutdown_client(client);
2703
2704 return err;
2705}
2706
2707static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2708 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2709{
2710 int status;
2711 struct rpc_clnt *client = NFS_CLIENT(dir);
2712
2713 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2714 if (client != NFS_CLIENT(dir)) {
2715 rpc_shutdown_client(client);
2716 nfs_fixup_secinfo_attributes(fattr);
2717 }
2718 return status;
2719}
2720
2721struct rpc_clnt *
2722nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2723 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2724{
2725 int status;
2726 struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2727
2728 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2729 if (status < 0) {
2730 rpc_shutdown_client(client);
2731 return ERR_PTR(status);
2732 }
2733 return client;
2734}
2735
2736static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2737{
2738 struct nfs_server *server = NFS_SERVER(inode);
2739 struct nfs4_accessargs args = {
2740 .fh = NFS_FH(inode),
2741 .bitmask = server->cache_consistency_bitmask,
2742 };
2743 struct nfs4_accessres res = {
2744 .server = server,
2745 };
2746 struct rpc_message msg = {
2747 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2748 .rpc_argp = &args,
2749 .rpc_resp = &res,
2750 .rpc_cred = entry->cred,
2751 };
2752 int mode = entry->mask;
2753 int status;
2754
2755 /*
2756 * Determine which access bits we want to ask for...
2757 */
2758 if (mode & MAY_READ)
2759 args.access |= NFS4_ACCESS_READ;
2760 if (S_ISDIR(inode->i_mode)) {
2761 if (mode & MAY_WRITE)
2762 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2763 if (mode & MAY_EXEC)
2764 args.access |= NFS4_ACCESS_LOOKUP;
2765 } else {
2766 if (mode & MAY_WRITE)
2767 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2768 if (mode & MAY_EXEC)
2769 args.access |= NFS4_ACCESS_EXECUTE;
2770 }
2771
2772 res.fattr = nfs_alloc_fattr();
2773 if (res.fattr == NULL)
2774 return -ENOMEM;
2775
2776 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2777 if (!status) {
2778 nfs_access_set_mask(entry, res.access);
2779 nfs_refresh_inode(inode, res.fattr);
2780 }
2781 nfs_free_fattr(res.fattr);
2782 return status;
2783}
2784
2785static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2786{
2787 struct nfs4_exception exception = { };
2788 int err;
2789 do {
2790 err = nfs4_handle_exception(NFS_SERVER(inode),
2791 _nfs4_proc_access(inode, entry),
2792 &exception);
2793 } while (exception.retry);
2794 return err;
2795}
2796
2797/*
2798 * TODO: For the time being, we don't try to get any attributes
2799 * along with any of the zero-copy operations READ, READDIR,
2800 * READLINK, WRITE.
2801 *
2802 * In the case of the first three, we want to put the GETATTR
2803 * after the read-type operation -- this is because it is hard
2804 * to predict the length of a GETATTR response in v4, and thus
2805 * align the READ data correctly. This means that the GETATTR
2806 * may end up partially falling into the page cache, and we should
2807 * shift it into the 'tail' of the xdr_buf before processing.
2808 * To do this efficiently, we need to know the total length
2809 * of data received, which doesn't seem to be available outside
2810 * of the RPC layer.
2811 *
2812 * In the case of WRITE, we also want to put the GETATTR after
2813 * the operation -- in this case because we want to make sure
2814 * we get the post-operation mtime and size.
2815 *
2816 * Both of these changes to the XDR layer would in fact be quite
2817 * minor, but I decided to leave them for a subsequent patch.
2818 */
2819static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2820 unsigned int pgbase, unsigned int pglen)
2821{
2822 struct nfs4_readlink args = {
2823 .fh = NFS_FH(inode),
2824 .pgbase = pgbase,
2825 .pglen = pglen,
2826 .pages = &page,
2827 };
2828 struct nfs4_readlink_res res;
2829 struct rpc_message msg = {
2830 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2831 .rpc_argp = &args,
2832 .rpc_resp = &res,
2833 };
2834
2835 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2836}
2837
2838static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2839 unsigned int pgbase, unsigned int pglen)
2840{
2841 struct nfs4_exception exception = { };
2842 int err;
2843 do {
2844 err = nfs4_handle_exception(NFS_SERVER(inode),
2845 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2846 &exception);
2847 } while (exception.retry);
2848 return err;
2849}
2850
2851/*
2852 * This is just for mknod. open(O_CREAT) will always do ->open_context().
2853 */
2854static int
2855nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2856 int flags)
2857{
2858 struct nfs_open_context *ctx;
2859 struct nfs4_state *state;
2860 int status = 0;
2861
2862 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2863 if (IS_ERR(ctx))
2864 return PTR_ERR(ctx);
2865
2866 sattr->ia_mode &= ~current_umask();
2867 state = nfs4_do_open(dir, dentry, ctx->mode,
2868 flags, sattr, ctx->cred,
2869 &ctx->mdsthreshold);
2870 d_drop(dentry);
2871 if (IS_ERR(state)) {
2872 status = PTR_ERR(state);
2873 goto out;
2874 }
2875 d_add(dentry, igrab(state->inode));
2876 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2877 ctx->state = state;
2878out:
2879 put_nfs_open_context(ctx);
2880 return status;
2881}
2882
2883static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2884{
2885 struct nfs_server *server = NFS_SERVER(dir);
2886 struct nfs_removeargs args = {
2887 .fh = NFS_FH(dir),
2888 .name = *name,
2889 };
2890 struct nfs_removeres res = {
2891 .server = server,
2892 };
2893 struct rpc_message msg = {
2894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2895 .rpc_argp = &args,
2896 .rpc_resp = &res,
2897 };
2898 int status;
2899
2900 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2901 if (status == 0)
2902 update_changeattr(dir, &res.cinfo);
2903 return status;
2904}
2905
2906static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2907{
2908 struct nfs4_exception exception = { };
2909 int err;
2910 do {
2911 err = nfs4_handle_exception(NFS_SERVER(dir),
2912 _nfs4_proc_remove(dir, name),
2913 &exception);
2914 } while (exception.retry);
2915 return err;
2916}
2917
2918static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2919{
2920 struct nfs_server *server = NFS_SERVER(dir);
2921 struct nfs_removeargs *args = msg->rpc_argp;
2922 struct nfs_removeres *res = msg->rpc_resp;
2923
2924 res->server = server;
2925 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2926 nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2927}
2928
2929static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2930{
2931 nfs4_setup_sequence(NFS_SERVER(data->dir),
2932 &data->args.seq_args,
2933 &data->res.seq_res,
2934 task);
2935}
2936
2937static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2938{
2939 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2940
2941 if (!nfs4_sequence_done(task, &res->seq_res))
2942 return 0;
2943 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2944 return 0;
2945 update_changeattr(dir, &res->cinfo);
2946 return 1;
2947}
2948
2949static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2950{
2951 struct nfs_server *server = NFS_SERVER(dir);
2952 struct nfs_renameargs *arg = msg->rpc_argp;
2953 struct nfs_renameres *res = msg->rpc_resp;
2954
2955 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2956 res->server = server;
2957 nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2958}
2959
2960static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2961{
2962 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2963 &data->args.seq_args,
2964 &data->res.seq_res,
2965 task);
2966}
2967
2968static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2969 struct inode *new_dir)
2970{
2971 struct nfs_renameres *res = task->tk_msg.rpc_resp;
2972
2973 if (!nfs4_sequence_done(task, &res->seq_res))
2974 return 0;
2975 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2976 return 0;
2977
2978 update_changeattr(old_dir, &res->old_cinfo);
2979 update_changeattr(new_dir, &res->new_cinfo);
2980 return 1;
2981}
2982
2983static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2984 struct inode *new_dir, struct qstr *new_name)
2985{
2986 struct nfs_server *server = NFS_SERVER(old_dir);
2987 struct nfs_renameargs arg = {
2988 .old_dir = NFS_FH(old_dir),
2989 .new_dir = NFS_FH(new_dir),
2990 .old_name = old_name,
2991 .new_name = new_name,
2992 };
2993 struct nfs_renameres res = {
2994 .server = server,
2995 };
2996 struct rpc_message msg = {
2997 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2998 .rpc_argp = &arg,
2999 .rpc_resp = &res,
3000 };
3001 int status = -ENOMEM;
3002
3003 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3004 if (!status) {
3005 update_changeattr(old_dir, &res.old_cinfo);
3006 update_changeattr(new_dir, &res.new_cinfo);
3007 }
3008 return status;
3009}
3010
3011static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3012 struct inode *new_dir, struct qstr *new_name)
3013{
3014 struct nfs4_exception exception = { };
3015 int err;
3016 do {
3017 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3018 _nfs4_proc_rename(old_dir, old_name,
3019 new_dir, new_name),
3020 &exception);
3021 } while (exception.retry);
3022 return err;
3023}
3024
3025static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3026{
3027 struct nfs_server *server = NFS_SERVER(inode);
3028 struct nfs4_link_arg arg = {
3029 .fh = NFS_FH(inode),
3030 .dir_fh = NFS_FH(dir),
3031 .name = name,
3032 .bitmask = server->attr_bitmask,
3033 };
3034 struct nfs4_link_res res = {
3035 .server = server,
3036 };
3037 struct rpc_message msg = {
3038 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3039 .rpc_argp = &arg,
3040 .rpc_resp = &res,
3041 };
3042 int status = -ENOMEM;
3043
3044 res.fattr = nfs_alloc_fattr();
3045 if (res.fattr == NULL)
3046 goto out;
3047
3048 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3049 if (!status) {
3050 update_changeattr(dir, &res.cinfo);
3051 nfs_post_op_update_inode(inode, res.fattr);
3052 }
3053out:
3054 nfs_free_fattr(res.fattr);
3055 return status;
3056}
3057
3058static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3059{
3060 struct nfs4_exception exception = { };
3061 int err;
3062 do {
3063 err = nfs4_handle_exception(NFS_SERVER(inode),
3064 _nfs4_proc_link(inode, dir, name),
3065 &exception);
3066 } while (exception.retry);
3067 return err;
3068}
3069
3070struct nfs4_createdata {
3071 struct rpc_message msg;
3072 struct nfs4_create_arg arg;
3073 struct nfs4_create_res res;
3074 struct nfs_fh fh;
3075 struct nfs_fattr fattr;
3076};
3077
3078static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3079 struct qstr *name, struct iattr *sattr, u32 ftype)
3080{
3081 struct nfs4_createdata *data;
3082
3083 data = kzalloc(sizeof(*data), GFP_KERNEL);
3084 if (data != NULL) {
3085 struct nfs_server *server = NFS_SERVER(dir);
3086
3087 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3088 data->msg.rpc_argp = &data->arg;
3089 data->msg.rpc_resp = &data->res;
3090 data->arg.dir_fh = NFS_FH(dir);
3091 data->arg.server = server;
3092 data->arg.name = name;
3093 data->arg.attrs = sattr;
3094 data->arg.ftype = ftype;
3095 data->arg.bitmask = server->attr_bitmask;
3096 data->res.server = server;
3097 data->res.fh = &data->fh;
3098 data->res.fattr = &data->fattr;
3099 nfs_fattr_init(data->res.fattr);
3100 }
3101 return data;
3102}
3103
3104static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3105{
3106 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3107 &data->arg.seq_args, &data->res.seq_res, 1);
3108 if (status == 0) {
3109 update_changeattr(dir, &data->res.dir_cinfo);
3110 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3111 }
3112 return status;
3113}
3114
3115static void nfs4_free_createdata(struct nfs4_createdata *data)
3116{
3117 kfree(data);
3118}
3119
3120static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3121 struct page *page, unsigned int len, struct iattr *sattr)
3122{
3123 struct nfs4_createdata *data;
3124 int status = -ENAMETOOLONG;
3125
3126 if (len > NFS4_MAXPATHLEN)
3127 goto out;
3128
3129 status = -ENOMEM;
3130 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3131 if (data == NULL)
3132 goto out;
3133
3134 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3135 data->arg.u.symlink.pages = &page;
3136 data->arg.u.symlink.len = len;
3137
3138 status = nfs4_do_create(dir, dentry, data);
3139
3140 nfs4_free_createdata(data);
3141out:
3142 return status;
3143}
3144
3145static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3146 struct page *page, unsigned int len, struct iattr *sattr)
3147{
3148 struct nfs4_exception exception = { };
3149 int err;
3150 do {
3151 err = nfs4_handle_exception(NFS_SERVER(dir),
3152 _nfs4_proc_symlink(dir, dentry, page,
3153 len, sattr),
3154 &exception);
3155 } while (exception.retry);
3156 return err;
3157}
3158
3159static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3160 struct iattr *sattr)
3161{
3162 struct nfs4_createdata *data;
3163 int status = -ENOMEM;
3164
3165 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3166 if (data == NULL)
3167 goto out;
3168
3169 status = nfs4_do_create(dir, dentry, data);
3170
3171 nfs4_free_createdata(data);
3172out:
3173 return status;
3174}
3175
3176static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3177 struct iattr *sattr)
3178{
3179 struct nfs4_exception exception = { };
3180 int err;
3181
3182 sattr->ia_mode &= ~current_umask();
3183 do {
3184 err = nfs4_handle_exception(NFS_SERVER(dir),
3185 _nfs4_proc_mkdir(dir, dentry, sattr),
3186 &exception);
3187 } while (exception.retry);
3188 return err;
3189}
3190
3191static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3192 u64 cookie, struct page **pages, unsigned int count, int plus)
3193{
3194 struct inode *dir = dentry->d_inode;
3195 struct nfs4_readdir_arg args = {
3196 .fh = NFS_FH(dir),
3197 .pages = pages,
3198 .pgbase = 0,
3199 .count = count,
3200 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3201 .plus = plus,
3202 };
3203 struct nfs4_readdir_res res;
3204 struct rpc_message msg = {
3205 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3206 .rpc_argp = &args,
3207 .rpc_resp = &res,
3208 .rpc_cred = cred,
3209 };
3210 int status;
3211
3212 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3213 dentry->d_parent->d_name.name,
3214 dentry->d_name.name,
3215 (unsigned long long)cookie);
3216 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3217 res.pgbase = args.pgbase;
3218 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3219 if (status >= 0) {
3220 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3221 status += args.pgbase;
3222 }
3223
3224 nfs_invalidate_atime(dir);
3225
3226 dprintk("%s: returns %d\n", __func__, status);
3227 return status;
3228}
3229
3230static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3231 u64 cookie, struct page **pages, unsigned int count, int plus)
3232{
3233 struct nfs4_exception exception = { };
3234 int err;
3235 do {
3236 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3237 _nfs4_proc_readdir(dentry, cred, cookie,
3238 pages, count, plus),
3239 &exception);
3240 } while (exception.retry);
3241 return err;
3242}
3243
3244static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3245 struct iattr *sattr, dev_t rdev)
3246{
3247 struct nfs4_createdata *data;
3248 int mode = sattr->ia_mode;
3249 int status = -ENOMEM;
3250
3251 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3252 if (data == NULL)
3253 goto out;
3254
3255 if (S_ISFIFO(mode))
3256 data->arg.ftype = NF4FIFO;
3257 else if (S_ISBLK(mode)) {
3258 data->arg.ftype = NF4BLK;
3259 data->arg.u.device.specdata1 = MAJOR(rdev);
3260 data->arg.u.device.specdata2 = MINOR(rdev);
3261 }
3262 else if (S_ISCHR(mode)) {
3263 data->arg.ftype = NF4CHR;
3264 data->arg.u.device.specdata1 = MAJOR(rdev);
3265 data->arg.u.device.specdata2 = MINOR(rdev);
3266 } else if (!S_ISSOCK(mode)) {
3267 status = -EINVAL;
3268 goto out_free;
3269 }
3270
3271 status = nfs4_do_create(dir, dentry, data);
3272out_free:
3273 nfs4_free_createdata(data);
3274out:
3275 return status;
3276}
3277
3278static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3279 struct iattr *sattr, dev_t rdev)
3280{
3281 struct nfs4_exception exception = { };
3282 int err;
3283
3284 sattr->ia_mode &= ~current_umask();
3285 do {
3286 err = nfs4_handle_exception(NFS_SERVER(dir),
3287 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3288 &exception);
3289 } while (exception.retry);
3290 return err;
3291}
3292
3293static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3294 struct nfs_fsstat *fsstat)
3295{
3296 struct nfs4_statfs_arg args = {
3297 .fh = fhandle,
3298 .bitmask = server->attr_bitmask,
3299 };
3300 struct nfs4_statfs_res res = {
3301 .fsstat = fsstat,
3302 };
3303 struct rpc_message msg = {
3304 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3305 .rpc_argp = &args,
3306 .rpc_resp = &res,
3307 };
3308
3309 nfs_fattr_init(fsstat->fattr);
3310 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3311}
3312
3313static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3314{
3315 struct nfs4_exception exception = { };
3316 int err;
3317 do {
3318 err = nfs4_handle_exception(server,
3319 _nfs4_proc_statfs(server, fhandle, fsstat),
3320 &exception);
3321 } while (exception.retry);
3322 return err;
3323}
3324
3325static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3326 struct nfs_fsinfo *fsinfo)
3327{
3328 struct nfs4_fsinfo_arg args = {
3329 .fh = fhandle,
3330 .bitmask = server->attr_bitmask,
3331 };
3332 struct nfs4_fsinfo_res res = {
3333 .fsinfo = fsinfo,
3334 };
3335 struct rpc_message msg = {
3336 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3337 .rpc_argp = &args,
3338 .rpc_resp = &res,
3339 };
3340
3341 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3342}
3343
3344static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3345{
3346 struct nfs4_exception exception = { };
3347 int err;
3348
3349 do {
3350 err = nfs4_handle_exception(server,
3351 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3352 &exception);
3353 } while (exception.retry);
3354 return err;
3355}
3356
3357static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3358{
3359 int error;
3360
3361 nfs_fattr_init(fsinfo->fattr);
3362 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3363 if (error == 0) {
3364 /* block layout checks this! */
3365 server->pnfs_blksize = fsinfo->blksize;
3366 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3367 }
3368
3369 return error;
3370}
3371
3372static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3373 struct nfs_pathconf *pathconf)
3374{
3375 struct nfs4_pathconf_arg args = {
3376 .fh = fhandle,
3377 .bitmask = server->attr_bitmask,
3378 };
3379 struct nfs4_pathconf_res res = {
3380 .pathconf = pathconf,
3381 };
3382 struct rpc_message msg = {
3383 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3384 .rpc_argp = &args,
3385 .rpc_resp = &res,
3386 };
3387
3388 /* None of the pathconf attributes are mandatory to implement */
3389 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3390 memset(pathconf, 0, sizeof(*pathconf));
3391 return 0;
3392 }
3393
3394 nfs_fattr_init(pathconf->fattr);
3395 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3396}
3397
3398static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3399 struct nfs_pathconf *pathconf)
3400{
3401 struct nfs4_exception exception = { };
3402 int err;
3403
3404 do {
3405 err = nfs4_handle_exception(server,
3406 _nfs4_proc_pathconf(server, fhandle, pathconf),
3407 &exception);
3408 } while (exception.retry);
3409 return err;
3410}
3411
3412void __nfs4_read_done_cb(struct nfs_read_data *data)
3413{
3414 nfs_invalidate_atime(data->header->inode);
3415}
3416
3417static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3418{
3419 struct nfs_server *server = NFS_SERVER(data->header->inode);
3420
3421 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3422 rpc_restart_call_prepare(task);
3423 return -EAGAIN;
3424 }
3425
3426 __nfs4_read_done_cb(data);
3427 if (task->tk_status > 0)
3428 renew_lease(server, data->timestamp);
3429 return 0;
3430}
3431
3432static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3433{
3434
3435 dprintk("--> %s\n", __func__);
3436
3437 if (!nfs4_sequence_done(task, &data->res.seq_res))
3438 return -EAGAIN;
3439
3440 return data->read_done_cb ? data->read_done_cb(task, data) :
3441 nfs4_read_done_cb(task, data);
3442}
3443
3444static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3445{
3446 data->timestamp = jiffies;
3447 data->read_done_cb = nfs4_read_done_cb;
3448 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3449 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3450}
3451
3452static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3453{
3454 nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3455 &data->args.seq_args,
3456 &data->res.seq_res,
3457 task);
3458}
3459
3460static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3461{
3462 struct inode *inode = data->header->inode;
3463
3464 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3465 rpc_restart_call_prepare(task);
3466 return -EAGAIN;
3467 }
3468 if (task->tk_status >= 0) {
3469 renew_lease(NFS_SERVER(inode), data->timestamp);
3470 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3471 }
3472 return 0;
3473}
3474
3475static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3476{
3477 if (!nfs4_sequence_done(task, &data->res.seq_res))
3478 return -EAGAIN;
3479 return data->write_done_cb ? data->write_done_cb(task, data) :
3480 nfs4_write_done_cb(task, data);
3481}
3482
3483static
3484bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3485{
3486 const struct nfs_pgio_header *hdr = data->header;
3487
3488 /* Don't request attributes for pNFS or O_DIRECT writes */
3489 if (data->ds_clp != NULL || hdr->dreq != NULL)
3490 return false;
3491 /* Otherwise, request attributes if and only if we don't hold
3492 * a delegation
3493 */
3494 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3495}
3496
3497static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3498{
3499 struct nfs_server *server = NFS_SERVER(data->header->inode);
3500
3501 if (!nfs4_write_need_cache_consistency_data(data)) {
3502 data->args.bitmask = NULL;
3503 data->res.fattr = NULL;
3504 } else
3505 data->args.bitmask = server->cache_consistency_bitmask;
3506
3507 if (!data->write_done_cb)
3508 data->write_done_cb = nfs4_write_done_cb;
3509 data->res.server = server;
3510 data->timestamp = jiffies;
3511
3512 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3513 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3514}
3515
3516static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3517{
3518 nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3519 &data->args.seq_args,
3520 &data->res.seq_res,
3521 task);
3522}
3523
3524static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3525{
3526 nfs4_setup_sequence(NFS_SERVER(data->inode),
3527 &data->args.seq_args,
3528 &data->res.seq_res,
3529 task);
3530}
3531
3532static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3533{
3534 struct inode *inode = data->inode;
3535
3536 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3537 rpc_restart_call_prepare(task);
3538 return -EAGAIN;
3539 }
3540 return 0;
3541}
3542
3543static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3544{
3545 if (!nfs4_sequence_done(task, &data->res.seq_res))
3546 return -EAGAIN;
3547 return data->commit_done_cb(task, data);
3548}
3549
3550static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3551{
3552 struct nfs_server *server = NFS_SERVER(data->inode);
3553
3554 if (data->commit_done_cb == NULL)
3555 data->commit_done_cb = nfs4_commit_done_cb;
3556 data->res.server = server;
3557 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3558 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3559}
3560
3561struct nfs4_renewdata {
3562 struct nfs_client *client;
3563 unsigned long timestamp;
3564};
3565
3566/*
3567 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3568 * standalone procedure for queueing an asynchronous RENEW.
3569 */
3570static void nfs4_renew_release(void *calldata)
3571{
3572 struct nfs4_renewdata *data = calldata;
3573 struct nfs_client *clp = data->client;
3574
3575 if (atomic_read(&clp->cl_count) > 1)
3576 nfs4_schedule_state_renewal(clp);
3577 nfs_put_client(clp);
3578 kfree(data);
3579}
3580
3581static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3582{
3583 struct nfs4_renewdata *data = calldata;
3584 struct nfs_client *clp = data->client;
3585 unsigned long timestamp = data->timestamp;
3586
3587 if (task->tk_status < 0) {
3588 /* Unless we're shutting down, schedule state recovery! */
3589 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3590 return;
3591 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3592 nfs4_schedule_lease_recovery(clp);
3593 return;
3594 }
3595 nfs4_schedule_path_down_recovery(clp);
3596 }
3597 do_renew_lease(clp, timestamp);
3598}
3599
3600static const struct rpc_call_ops nfs4_renew_ops = {
3601 .rpc_call_done = nfs4_renew_done,
3602 .rpc_release = nfs4_renew_release,
3603};
3604
3605static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3606{
3607 struct rpc_message msg = {
3608 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3609 .rpc_argp = clp,
3610 .rpc_cred = cred,
3611 };
3612 struct nfs4_renewdata *data;
3613
3614 if (renew_flags == 0)
3615 return 0;
3616 if (!atomic_inc_not_zero(&clp->cl_count))
3617 return -EIO;
3618 data = kmalloc(sizeof(*data), GFP_NOFS);
3619 if (data == NULL)
3620 return -ENOMEM;
3621 data->client = clp;
3622 data->timestamp = jiffies;
3623 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3624 &nfs4_renew_ops, data);
3625}
3626
3627static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3628{
3629 struct rpc_message msg = {
3630 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3631 .rpc_argp = clp,
3632 .rpc_cred = cred,
3633 };
3634 unsigned long now = jiffies;
3635 int status;
3636
3637 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3638 if (status < 0)
3639 return status;
3640 do_renew_lease(clp, now);
3641 return 0;
3642}
3643
3644static inline int nfs4_server_supports_acls(struct nfs_server *server)
3645{
3646 return (server->caps & NFS_CAP_ACLS)
3647 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3648 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3649}
3650
3651/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3652 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3653 * the stack.
3654 */
3655#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3656
3657static int buf_to_pages_noslab(const void *buf, size_t buflen,
3658 struct page **pages, unsigned int *pgbase)
3659{
3660 struct page *newpage, **spages;
3661 int rc = 0;
3662 size_t len;
3663 spages = pages;
3664
3665 do {
3666 len = min_t(size_t, PAGE_SIZE, buflen);
3667 newpage = alloc_page(GFP_KERNEL);
3668
3669 if (newpage == NULL)
3670 goto unwind;
3671 memcpy(page_address(newpage), buf, len);
3672 buf += len;
3673 buflen -= len;
3674 *pages++ = newpage;
3675 rc++;
3676 } while (buflen != 0);
3677
3678 return rc;
3679
3680unwind:
3681 for(; rc > 0; rc--)
3682 __free_page(spages[rc-1]);
3683 return -ENOMEM;
3684}
3685
3686struct nfs4_cached_acl {
3687 int cached;
3688 size_t len;
3689 char data[0];
3690};
3691
3692static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3693{
3694 struct nfs_inode *nfsi = NFS_I(inode);
3695
3696 spin_lock(&inode->i_lock);
3697 kfree(nfsi->nfs4_acl);
3698 nfsi->nfs4_acl = acl;
3699 spin_unlock(&inode->i_lock);
3700}
3701
3702static void nfs4_zap_acl_attr(struct inode *inode)
3703{
3704 nfs4_set_cached_acl(inode, NULL);
3705}
3706
3707static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3708{
3709 struct nfs_inode *nfsi = NFS_I(inode);
3710 struct nfs4_cached_acl *acl;
3711 int ret = -ENOENT;
3712
3713 spin_lock(&inode->i_lock);
3714 acl = nfsi->nfs4_acl;
3715 if (acl == NULL)
3716 goto out;
3717 if (buf == NULL) /* user is just asking for length */
3718 goto out_len;
3719 if (acl->cached == 0)
3720 goto out;
3721 ret = -ERANGE; /* see getxattr(2) man page */
3722 if (acl->len > buflen)
3723 goto out;
3724 memcpy(buf, acl->data, acl->len);
3725out_len:
3726 ret = acl->len;
3727out:
3728 spin_unlock(&inode->i_lock);
3729 return ret;
3730}
3731
3732static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3733{
3734 struct nfs4_cached_acl *acl;
3735 size_t buflen = sizeof(*acl) + acl_len;
3736
3737 if (buflen <= PAGE_SIZE) {
3738 acl = kmalloc(buflen, GFP_KERNEL);
3739 if (acl == NULL)
3740 goto out;
3741 acl->cached = 1;
3742 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3743 } else {
3744 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3745 if (acl == NULL)
3746 goto out;
3747 acl->cached = 0;
3748 }
3749 acl->len = acl_len;
3750out:
3751 nfs4_set_cached_acl(inode, acl);
3752}
3753
3754/*
3755 * The getxattr API returns the required buffer length when called with a
3756 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3757 * the required buf. On a NULL buf, we send a page of data to the server
3758 * guessing that the ACL request can be serviced by a page. If so, we cache
3759 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3760 * the cache. If not so, we throw away the page, and cache the required
3761 * length. The next getxattr call will then produce another round trip to
3762 * the server, this time with the input buf of the required size.
3763 */
3764static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3765{
3766 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3767 struct nfs_getaclargs args = {
3768 .fh = NFS_FH(inode),
3769 .acl_pages = pages,
3770 .acl_len = buflen,
3771 };
3772 struct nfs_getaclres res = {
3773 .acl_len = buflen,
3774 };
3775 struct rpc_message msg = {
3776 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3777 .rpc_argp = &args,
3778 .rpc_resp = &res,
3779 };
3780 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3781 int ret = -ENOMEM, i;
3782
3783 /* As long as we're doing a round trip to the server anyway,
3784 * let's be prepared for a page of acl data. */
3785 if (npages == 0)
3786 npages = 1;
3787 if (npages > ARRAY_SIZE(pages))
3788 return -ERANGE;
3789
3790 for (i = 0; i < npages; i++) {
3791 pages[i] = alloc_page(GFP_KERNEL);
3792 if (!pages[i])
3793 goto out_free;
3794 }
3795
3796 /* for decoding across pages */
3797 res.acl_scratch = alloc_page(GFP_KERNEL);
3798 if (!res.acl_scratch)
3799 goto out_free;
3800
3801 args.acl_len = npages * PAGE_SIZE;
3802 args.acl_pgbase = 0;
3803
3804 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
3805 __func__, buf, buflen, npages, args.acl_len);
3806 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3807 &msg, &args.seq_args, &res.seq_res, 0);
3808 if (ret)
3809 goto out_free;
3810
3811 /* Handle the case where the passed-in buffer is too short */
3812 if (res.acl_flags & NFS4_ACL_TRUNC) {
3813 /* Did the user only issue a request for the acl length? */
3814 if (buf == NULL)
3815 goto out_ok;
3816 ret = -ERANGE;
3817 goto out_free;
3818 }
3819 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3820 if (buf)
3821 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3822out_ok:
3823 ret = res.acl_len;
3824out_free:
3825 for (i = 0; i < npages; i++)
3826 if (pages[i])
3827 __free_page(pages[i]);
3828 if (res.acl_scratch)
3829 __free_page(res.acl_scratch);
3830 return ret;
3831}
3832
3833static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3834{
3835 struct nfs4_exception exception = { };
3836 ssize_t ret;
3837 do {
3838 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3839 if (ret >= 0)
3840 break;
3841 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3842 } while (exception.retry);
3843 return ret;
3844}
3845
3846static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3847{
3848 struct nfs_server *server = NFS_SERVER(inode);
3849 int ret;
3850
3851 if (!nfs4_server_supports_acls(server))
3852 return -EOPNOTSUPP;
3853 ret = nfs_revalidate_inode(server, inode);
3854 if (ret < 0)
3855 return ret;
3856 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3857 nfs_zap_acl_cache(inode);
3858 ret = nfs4_read_cached_acl(inode, buf, buflen);
3859 if (ret != -ENOENT)
3860 /* -ENOENT is returned if there is no ACL or if there is an ACL
3861 * but no cached acl data, just the acl length */
3862 return ret;
3863 return nfs4_get_acl_uncached(inode, buf, buflen);
3864}
3865
3866static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3867{
3868 struct nfs_server *server = NFS_SERVER(inode);
3869 struct page *pages[NFS4ACL_MAXPAGES];
3870 struct nfs_setaclargs arg = {
3871 .fh = NFS_FH(inode),
3872 .acl_pages = pages,
3873 .acl_len = buflen,
3874 };
3875 struct nfs_setaclres res;
3876 struct rpc_message msg = {
3877 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3878 .rpc_argp = &arg,
3879 .rpc_resp = &res,
3880 };
3881 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3882 int ret, i;
3883
3884 if (!nfs4_server_supports_acls(server))
3885 return -EOPNOTSUPP;
3886 if (npages > ARRAY_SIZE(pages))
3887 return -ERANGE;
3888 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3889 if (i < 0)
3890 return i;
3891 nfs4_inode_return_delegation(inode);
3892 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3893
3894 /*
3895 * Free each page after tx, so the only ref left is
3896 * held by the network stack
3897 */
3898 for (; i > 0; i--)
3899 put_page(pages[i-1]);
3900
3901 /*
3902 * Acl update can result in inode attribute update.
3903 * so mark the attribute cache invalid.
3904 */
3905 spin_lock(&inode->i_lock);
3906 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3907 spin_unlock(&inode->i_lock);
3908 nfs_access_zap_cache(inode);
3909 nfs_zap_acl_cache(inode);
3910 return ret;
3911}
3912
3913static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3914{
3915 struct nfs4_exception exception = { };
3916 int err;
3917 do {
3918 err = nfs4_handle_exception(NFS_SERVER(inode),
3919 __nfs4_proc_set_acl(inode, buf, buflen),
3920 &exception);
3921 } while (exception.retry);
3922 return err;
3923}
3924
3925static int
3926nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3927{
3928 struct nfs_client *clp = server->nfs_client;
3929
3930 if (task->tk_status >= 0)
3931 return 0;
3932 switch(task->tk_status) {
3933 case -NFS4ERR_DELEG_REVOKED:
3934 case -NFS4ERR_ADMIN_REVOKED:
3935 case -NFS4ERR_BAD_STATEID:
3936 if (state == NULL)
3937 break;
3938 nfs_remove_bad_delegation(state->inode);
3939 case -NFS4ERR_OPENMODE:
3940 if (state == NULL)
3941 break;
3942 nfs4_schedule_stateid_recovery(server, state);
3943 goto wait_on_recovery;
3944 case -NFS4ERR_EXPIRED:
3945 if (state != NULL)
3946 nfs4_schedule_stateid_recovery(server, state);
3947 case -NFS4ERR_STALE_STATEID:
3948 case -NFS4ERR_STALE_CLIENTID:
3949 nfs4_schedule_lease_recovery(clp);
3950 goto wait_on_recovery;
3951#if defined(CONFIG_NFS_V4_1)
3952 case -NFS4ERR_BADSESSION:
3953 case -NFS4ERR_BADSLOT:
3954 case -NFS4ERR_BAD_HIGH_SLOT:
3955 case -NFS4ERR_DEADSESSION:
3956 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3957 case -NFS4ERR_SEQ_FALSE_RETRY:
3958 case -NFS4ERR_SEQ_MISORDERED:
3959 dprintk("%s ERROR %d, Reset session\n", __func__,
3960 task->tk_status);
3961 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3962 task->tk_status = 0;
3963 return -EAGAIN;
3964#endif /* CONFIG_NFS_V4_1 */
3965 case -NFS4ERR_DELAY:
3966 nfs_inc_server_stats(server, NFSIOS_DELAY);
3967 case -NFS4ERR_GRACE:
3968 case -EKEYEXPIRED:
3969 rpc_delay(task, NFS4_POLL_RETRY_MAX);
3970 task->tk_status = 0;
3971 return -EAGAIN;
3972 case -NFS4ERR_RETRY_UNCACHED_REP:
3973 case -NFS4ERR_OLD_STATEID:
3974 task->tk_status = 0;
3975 return -EAGAIN;
3976 }
3977 task->tk_status = nfs4_map_errors(task->tk_status);
3978 return 0;
3979wait_on_recovery:
3980 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3981 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3982 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3983 task->tk_status = 0;
3984 return -EAGAIN;
3985}
3986
3987static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3988 nfs4_verifier *bootverf)
3989{
3990 __be32 verf[2];
3991
3992 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3993 /* An impossible timestamp guarantees this value
3994 * will never match a generated boot time. */
3995 verf[0] = 0;
3996 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3997 } else {
3998 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3999 verf[0] = (__be32)nn->boot_time.tv_sec;
4000 verf[1] = (__be32)nn->boot_time.tv_nsec;
4001 }
4002 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4003}
4004
4005static unsigned int
4006nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4007 char *buf, size_t len)
4008{
4009 unsigned int result;
4010
4011 rcu_read_lock();
4012 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4013 clp->cl_ipaddr,
4014 rpc_peeraddr2str(clp->cl_rpcclient,
4015 RPC_DISPLAY_ADDR),
4016 rpc_peeraddr2str(clp->cl_rpcclient,
4017 RPC_DISPLAY_PROTO));
4018 rcu_read_unlock();
4019 return result;
4020}
4021
4022static unsigned int
4023nfs4_init_uniform_client_string(const struct nfs_client *clp,
4024 char *buf, size_t len)
4025{
4026 char *nodename = clp->cl_rpcclient->cl_nodename;
4027
4028 if (nfs4_client_id_uniquifier[0] != '\0')
4029 nodename = nfs4_client_id_uniquifier;
4030 return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4031 clp->rpc_ops->version, clp->cl_minorversion,
4032 nodename);
4033}
4034
4035/**
4036 * nfs4_proc_setclientid - Negotiate client ID
4037 * @clp: state data structure
4038 * @program: RPC program for NFSv4 callback service
4039 * @port: IP port number for NFS4 callback service
4040 * @cred: RPC credential to use for this call
4041 * @res: where to place the result
4042 *
4043 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4044 */
4045int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4046 unsigned short port, struct rpc_cred *cred,
4047 struct nfs4_setclientid_res *res)
4048{
4049 nfs4_verifier sc_verifier;
4050 struct nfs4_setclientid setclientid = {
4051 .sc_verifier = &sc_verifier,
4052 .sc_prog = program,
4053 .sc_cb_ident = clp->cl_cb_ident,
4054 };
4055 struct rpc_message msg = {
4056 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4057 .rpc_argp = &setclientid,
4058 .rpc_resp = res,
4059 .rpc_cred = cred,
4060 };
4061 int status;
4062
4063 /* nfs_client_id4 */
4064 nfs4_init_boot_verifier(clp, &sc_verifier);
4065 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4066 setclientid.sc_name_len =
4067 nfs4_init_uniform_client_string(clp,
4068 setclientid.sc_name,
4069 sizeof(setclientid.sc_name));
4070 else
4071 setclientid.sc_name_len =
4072 nfs4_init_nonuniform_client_string(clp,
4073 setclientid.sc_name,
4074 sizeof(setclientid.sc_name));
4075 /* cb_client4 */
4076 rcu_read_lock();
4077 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4078 sizeof(setclientid.sc_netid),
4079 rpc_peeraddr2str(clp->cl_rpcclient,
4080 RPC_DISPLAY_NETID));
4081 rcu_read_unlock();
4082 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4083 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4084 clp->cl_ipaddr, port >> 8, port & 255);
4085
4086 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
4087 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4088 setclientid.sc_name_len, setclientid.sc_name);
4089 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4090 dprintk("NFS reply setclientid: %d\n", status);
4091 return status;
4092}
4093
4094/**
4095 * nfs4_proc_setclientid_confirm - Confirm client ID
4096 * @clp: state data structure
4097 * @res: result of a previous SETCLIENTID
4098 * @cred: RPC credential to use for this call
4099 *
4100 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4101 */
4102int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4103 struct nfs4_setclientid_res *arg,
4104 struct rpc_cred *cred)
4105{
4106 struct nfs_fsinfo fsinfo;
4107 struct rpc_message msg = {
4108 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4109 .rpc_argp = arg,
4110 .rpc_resp = &fsinfo,
4111 .rpc_cred = cred,
4112 };
4113 unsigned long now;
4114 int status;
4115
4116 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
4117 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4118 clp->cl_clientid);
4119 now = jiffies;
4120 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4121 if (status == 0) {
4122 spin_lock(&clp->cl_lock);
4123 clp->cl_lease_time = fsinfo.lease_time * HZ;
4124 clp->cl_last_renewal = now;
4125 spin_unlock(&clp->cl_lock);
4126 }
4127 dprintk("NFS reply setclientid_confirm: %d\n", status);
4128 return status;
4129}
4130
4131struct nfs4_delegreturndata {
4132 struct nfs4_delegreturnargs args;
4133 struct nfs4_delegreturnres res;
4134 struct nfs_fh fh;
4135 nfs4_stateid stateid;
4136 unsigned long timestamp;
4137 struct nfs_fattr fattr;
4138 int rpc_status;
4139};
4140
4141static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4142{
4143 struct nfs4_delegreturndata *data = calldata;
4144
4145 if (!nfs4_sequence_done(task, &data->res.seq_res))
4146 return;
4147
4148 switch (task->tk_status) {
4149 case -NFS4ERR_STALE_STATEID:
4150 case -NFS4ERR_EXPIRED:
4151 case 0:
4152 renew_lease(data->res.server, data->timestamp);
4153 break;
4154 default:
4155 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4156 -EAGAIN) {
4157 rpc_restart_call_prepare(task);
4158 return;
4159 }
4160 }
4161 data->rpc_status = task->tk_status;
4162}
4163
4164static void nfs4_delegreturn_release(void *calldata)
4165{
4166 kfree(calldata);
4167}
4168
4169#if defined(CONFIG_NFS_V4_1)
4170static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4171{
4172 struct nfs4_delegreturndata *d_data;
4173
4174 d_data = (struct nfs4_delegreturndata *)data;
4175
4176 nfs4_setup_sequence(d_data->res.server,
4177 &d_data->args.seq_args,
4178 &d_data->res.seq_res,
4179 task);
4180}
4181#endif /* CONFIG_NFS_V4_1 */
4182
4183static const struct rpc_call_ops nfs4_delegreturn_ops = {
4184#if defined(CONFIG_NFS_V4_1)
4185 .rpc_call_prepare = nfs4_delegreturn_prepare,
4186#endif /* CONFIG_NFS_V4_1 */
4187 .rpc_call_done = nfs4_delegreturn_done,
4188 .rpc_release = nfs4_delegreturn_release,
4189};
4190
4191static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4192{
4193 struct nfs4_delegreturndata *data;
4194 struct nfs_server *server = NFS_SERVER(inode);
4195 struct rpc_task *task;
4196 struct rpc_message msg = {
4197 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4198 .rpc_cred = cred,
4199 };
4200 struct rpc_task_setup task_setup_data = {
4201 .rpc_client = server->client,
4202 .rpc_message = &msg,
4203 .callback_ops = &nfs4_delegreturn_ops,
4204 .flags = RPC_TASK_ASYNC,
4205 };
4206 int status = 0;
4207
4208 data = kzalloc(sizeof(*data), GFP_NOFS);
4209 if (data == NULL)
4210 return -ENOMEM;
4211 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4212 data->args.fhandle = &data->fh;
4213 data->args.stateid = &data->stateid;
4214 data->args.bitmask = server->cache_consistency_bitmask;
4215 nfs_copy_fh(&data->fh, NFS_FH(inode));
4216 nfs4_stateid_copy(&data->stateid, stateid);
4217 data->res.fattr = &data->fattr;
4218 data->res.server = server;
4219 nfs_fattr_init(data->res.fattr);
4220 data->timestamp = jiffies;
4221 data->rpc_status = 0;
4222
4223 task_setup_data.callback_data = data;
4224 msg.rpc_argp = &data->args;
4225 msg.rpc_resp = &data->res;
4226 task = rpc_run_task(&task_setup_data);
4227 if (IS_ERR(task))
4228 return PTR_ERR(task);
4229 if (!issync)
4230 goto out;
4231 status = nfs4_wait_for_completion_rpc_task(task);
4232 if (status != 0)
4233 goto out;
4234 status = data->rpc_status;
4235 if (status == 0)
4236 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4237 else
4238 nfs_refresh_inode(inode, &data->fattr);
4239out:
4240 rpc_put_task(task);
4241 return status;
4242}
4243
4244int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4245{
4246 struct nfs_server *server = NFS_SERVER(inode);
4247 struct nfs4_exception exception = { };
4248 int err;
4249 do {
4250 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4251 switch (err) {
4252 case -NFS4ERR_STALE_STATEID:
4253 case -NFS4ERR_EXPIRED:
4254 case 0:
4255 return 0;
4256 }
4257 err = nfs4_handle_exception(server, err, &exception);
4258 } while (exception.retry);
4259 return err;
4260}
4261
4262#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4263#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4264
4265/*
4266 * sleep, with exponential backoff, and retry the LOCK operation.
4267 */
4268static unsigned long
4269nfs4_set_lock_task_retry(unsigned long timeout)
4270{
4271 freezable_schedule_timeout_killable(timeout);
4272 timeout <<= 1;
4273 if (timeout > NFS4_LOCK_MAXTIMEOUT)
4274 return NFS4_LOCK_MAXTIMEOUT;
4275 return timeout;
4276}
4277
4278static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4279{
4280 struct inode *inode = state->inode;
4281 struct nfs_server *server = NFS_SERVER(inode);
4282 struct nfs_client *clp = server->nfs_client;
4283 struct nfs_lockt_args arg = {
4284 .fh = NFS_FH(inode),
4285 .fl = request,
4286 };
4287 struct nfs_lockt_res res = {
4288 .denied = request,
4289 };
4290 struct rpc_message msg = {
4291 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4292 .rpc_argp = &arg,
4293 .rpc_resp = &res,
4294 .rpc_cred = state->owner->so_cred,
4295 };
4296 struct nfs4_lock_state *lsp;
4297 int status;
4298
4299 arg.lock_owner.clientid = clp->cl_clientid;
4300 status = nfs4_set_lock_state(state, request);
4301 if (status != 0)
4302 goto out;
4303 lsp = request->fl_u.nfs4_fl.owner;
4304 arg.lock_owner.id = lsp->ls_seqid.owner_id;
4305 arg.lock_owner.s_dev = server->s_dev;
4306 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4307 switch (status) {
4308 case 0:
4309 request->fl_type = F_UNLCK;
4310 break;
4311 case -NFS4ERR_DENIED:
4312 status = 0;
4313 }
4314 request->fl_ops->fl_release_private(request);
4315out:
4316 return status;
4317}
4318
4319static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4320{
4321 struct nfs4_exception exception = { };
4322 int err;
4323
4324 do {
4325 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4326 _nfs4_proc_getlk(state, cmd, request),
4327 &exception);
4328 } while (exception.retry);
4329 return err;
4330}
4331
4332static int do_vfs_lock(struct file *file, struct file_lock *fl)
4333{
4334 int res = 0;
4335 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4336 case FL_POSIX:
4337 res = posix_lock_file_wait(file, fl);
4338 break;
4339 case FL_FLOCK:
4340 res = flock_lock_file_wait(file, fl);
4341 break;
4342 default:
4343 BUG();
4344 }
4345 return res;
4346}
4347
4348struct nfs4_unlockdata {
4349 struct nfs_locku_args arg;
4350 struct nfs_locku_res res;
4351 struct nfs4_lock_state *lsp;
4352 struct nfs_open_context *ctx;
4353 struct file_lock fl;
4354 const struct nfs_server *server;
4355 unsigned long timestamp;
4356};
4357
4358static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4359 struct nfs_open_context *ctx,
4360 struct nfs4_lock_state *lsp,
4361 struct nfs_seqid *seqid)
4362{
4363 struct nfs4_unlockdata *p;
4364 struct inode *inode = lsp->ls_state->inode;
4365
4366 p = kzalloc(sizeof(*p), GFP_NOFS);
4367 if (p == NULL)
4368 return NULL;
4369 p->arg.fh = NFS_FH(inode);
4370 p->arg.fl = &p->fl;
4371 p->arg.seqid = seqid;
4372 p->res.seqid = seqid;
4373 p->arg.stateid = &lsp->ls_stateid;
4374 p->lsp = lsp;
4375 atomic_inc(&lsp->ls_count);
4376 /* Ensure we don't close file until we're done freeing locks! */
4377 p->ctx = get_nfs_open_context(ctx);
4378 memcpy(&p->fl, fl, sizeof(p->fl));
4379 p->server = NFS_SERVER(inode);
4380 return p;
4381}
4382
4383static void nfs4_locku_release_calldata(void *data)
4384{
4385 struct nfs4_unlockdata *calldata = data;
4386 nfs_free_seqid(calldata->arg.seqid);
4387 nfs4_put_lock_state(calldata->lsp);
4388 put_nfs_open_context(calldata->ctx);
4389 kfree(calldata);
4390}
4391
4392static void nfs4_locku_done(struct rpc_task *task, void *data)
4393{
4394 struct nfs4_unlockdata *calldata = data;
4395
4396 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4397 return;
4398 switch (task->tk_status) {
4399 case 0:
4400 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4401 &calldata->res.stateid);
4402 renew_lease(calldata->server, calldata->timestamp);
4403 break;
4404 case -NFS4ERR_BAD_STATEID:
4405 case -NFS4ERR_OLD_STATEID:
4406 case -NFS4ERR_STALE_STATEID:
4407 case -NFS4ERR_EXPIRED:
4408 break;
4409 default:
4410 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4411 rpc_restart_call_prepare(task);
4412 }
4413 nfs_release_seqid(calldata->arg.seqid);
4414}
4415
4416static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4417{
4418 struct nfs4_unlockdata *calldata = data;
4419
4420 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4421 return;
4422 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4423 /* Note: exit _without_ running nfs4_locku_done */
4424 task->tk_action = NULL;
4425 return;
4426 }
4427 calldata->timestamp = jiffies;
4428 if (nfs4_setup_sequence(calldata->server,
4429 &calldata->arg.seq_args,
4430 &calldata->res.seq_res,
4431 task) != 0)
4432 nfs_release_seqid(calldata->arg.seqid);
4433}
4434
4435static const struct rpc_call_ops nfs4_locku_ops = {
4436 .rpc_call_prepare = nfs4_locku_prepare,
4437 .rpc_call_done = nfs4_locku_done,
4438 .rpc_release = nfs4_locku_release_calldata,
4439};
4440
4441static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4442 struct nfs_open_context *ctx,
4443 struct nfs4_lock_state *lsp,
4444 struct nfs_seqid *seqid)
4445{
4446 struct nfs4_unlockdata *data;
4447 struct rpc_message msg = {
4448 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4449 .rpc_cred = ctx->cred,
4450 };
4451 struct rpc_task_setup task_setup_data = {
4452 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4453 .rpc_message = &msg,
4454 .callback_ops = &nfs4_locku_ops,
4455 .workqueue = nfsiod_workqueue,
4456 .flags = RPC_TASK_ASYNC,
4457 };
4458
4459 /* Ensure this is an unlock - when canceling a lock, the
4460 * canceled lock is passed in, and it won't be an unlock.
4461 */
4462 fl->fl_type = F_UNLCK;
4463
4464 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4465 if (data == NULL) {
4466 nfs_free_seqid(seqid);
4467 return ERR_PTR(-ENOMEM);
4468 }
4469
4470 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4471 msg.rpc_argp = &data->arg;
4472 msg.rpc_resp = &data->res;
4473 task_setup_data.callback_data = data;
4474 return rpc_run_task(&task_setup_data);
4475}
4476
4477static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4478{
4479 struct nfs_inode *nfsi = NFS_I(state->inode);
4480 struct nfs_seqid *seqid;
4481 struct nfs4_lock_state *lsp;
4482 struct rpc_task *task;
4483 int status = 0;
4484 unsigned char fl_flags = request->fl_flags;
4485
4486 status = nfs4_set_lock_state(state, request);
4487 /* Unlock _before_ we do the RPC call */
4488 request->fl_flags |= FL_EXISTS;
4489 down_read(&nfsi->rwsem);
4490 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4491 up_read(&nfsi->rwsem);
4492 goto out;
4493 }
4494 up_read(&nfsi->rwsem);
4495 if (status != 0)
4496 goto out;
4497 /* Is this a delegated lock? */
4498 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4499 goto out;
4500 lsp = request->fl_u.nfs4_fl.owner;
4501 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4502 status = -ENOMEM;
4503 if (seqid == NULL)
4504 goto out;
4505 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4506 status = PTR_ERR(task);
4507 if (IS_ERR(task))
4508 goto out;
4509 status = nfs4_wait_for_completion_rpc_task(task);
4510 rpc_put_task(task);
4511out:
4512 request->fl_flags = fl_flags;
4513 return status;
4514}
4515
4516struct nfs4_lockdata {
4517 struct nfs_lock_args arg;
4518 struct nfs_lock_res res;
4519 struct nfs4_lock_state *lsp;
4520 struct nfs_open_context *ctx;
4521 struct file_lock fl;
4522 unsigned long timestamp;
4523 int rpc_status;
4524 int cancelled;
4525 struct nfs_server *server;
4526};
4527
4528static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4529 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4530 gfp_t gfp_mask)
4531{
4532 struct nfs4_lockdata *p;
4533 struct inode *inode = lsp->ls_state->inode;
4534 struct nfs_server *server = NFS_SERVER(inode);
4535
4536 p = kzalloc(sizeof(*p), gfp_mask);
4537 if (p == NULL)
4538 return NULL;
4539
4540 p->arg.fh = NFS_FH(inode);
4541 p->arg.fl = &p->fl;
4542 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4543 if (p->arg.open_seqid == NULL)
4544 goto out_free;
4545 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4546 if (p->arg.lock_seqid == NULL)
4547 goto out_free_seqid;
4548 p->arg.lock_stateid = &lsp->ls_stateid;
4549 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4550 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4551 p->arg.lock_owner.s_dev = server->s_dev;
4552 p->res.lock_seqid = p->arg.lock_seqid;
4553 p->lsp = lsp;
4554 p->server = server;
4555 atomic_inc(&lsp->ls_count);
4556 p->ctx = get_nfs_open_context(ctx);
4557 memcpy(&p->fl, fl, sizeof(p->fl));
4558 return p;
4559out_free_seqid:
4560 nfs_free_seqid(p->arg.open_seqid);
4561out_free:
4562 kfree(p);
4563 return NULL;
4564}
4565
4566static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4567{
4568 struct nfs4_lockdata *data = calldata;
4569 struct nfs4_state *state = data->lsp->ls_state;
4570
4571 dprintk("%s: begin!\n", __func__);
4572 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4573 return;
4574 /* Do we need to do an open_to_lock_owner? */
4575 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4576 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4577 goto out_release_lock_seqid;
4578 data->arg.open_stateid = &state->stateid;
4579 data->arg.new_lock_owner = 1;
4580 data->res.open_seqid = data->arg.open_seqid;
4581 } else
4582 data->arg.new_lock_owner = 0;
4583 data->timestamp = jiffies;
4584 if (nfs4_setup_sequence(data->server,
4585 &data->arg.seq_args,
4586 &data->res.seq_res,
4587 task) == 0)
4588 return;
4589 nfs_release_seqid(data->arg.open_seqid);
4590out_release_lock_seqid:
4591 nfs_release_seqid(data->arg.lock_seqid);
4592 dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4593}
4594
4595static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4596{
4597 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4598 nfs4_lock_prepare(task, calldata);
4599}
4600
4601static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4602{
4603 struct nfs4_lockdata *data = calldata;
4604
4605 dprintk("%s: begin!\n", __func__);
4606
4607 if (!nfs4_sequence_done(task, &data->res.seq_res))
4608 return;
4609
4610 data->rpc_status = task->tk_status;
4611 if (data->arg.new_lock_owner != 0) {
4612 if (data->rpc_status == 0)
4613 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4614 else
4615 goto out;
4616 }
4617 if (data->rpc_status == 0) {
4618 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4619 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4620 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4621 }
4622out:
4623 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4624}
4625
4626static void nfs4_lock_release(void *calldata)
4627{
4628 struct nfs4_lockdata *data = calldata;
4629
4630 dprintk("%s: begin!\n", __func__);
4631 nfs_free_seqid(data->arg.open_seqid);
4632 if (data->cancelled != 0) {
4633 struct rpc_task *task;
4634 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4635 data->arg.lock_seqid);
4636 if (!IS_ERR(task))
4637 rpc_put_task_async(task);
4638 dprintk("%s: cancelling lock!\n", __func__);
4639 } else
4640 nfs_free_seqid(data->arg.lock_seqid);
4641 nfs4_put_lock_state(data->lsp);
4642 put_nfs_open_context(data->ctx);
4643 kfree(data);
4644 dprintk("%s: done!\n", __func__);
4645}
4646
4647static const struct rpc_call_ops nfs4_lock_ops = {
4648 .rpc_call_prepare = nfs4_lock_prepare,
4649 .rpc_call_done = nfs4_lock_done,
4650 .rpc_release = nfs4_lock_release,
4651};
4652
4653static const struct rpc_call_ops nfs4_recover_lock_ops = {
4654 .rpc_call_prepare = nfs4_recover_lock_prepare,
4655 .rpc_call_done = nfs4_lock_done,
4656 .rpc_release = nfs4_lock_release,
4657};
4658
4659static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4660{
4661 switch (error) {
4662 case -NFS4ERR_ADMIN_REVOKED:
4663 case -NFS4ERR_BAD_STATEID:
4664 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4665 if (new_lock_owner != 0 ||
4666 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4667 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4668 break;
4669 case -NFS4ERR_STALE_STATEID:
4670 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4671 case -NFS4ERR_EXPIRED:
4672 nfs4_schedule_lease_recovery(server->nfs_client);
4673 };
4674}
4675
4676static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4677{
4678 struct nfs4_lockdata *data;
4679 struct rpc_task *task;
4680 struct rpc_message msg = {
4681 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4682 .rpc_cred = state->owner->so_cred,
4683 };
4684 struct rpc_task_setup task_setup_data = {
4685 .rpc_client = NFS_CLIENT(state->inode),
4686 .rpc_message = &msg,
4687 .callback_ops = &nfs4_lock_ops,
4688 .workqueue = nfsiod_workqueue,
4689 .flags = RPC_TASK_ASYNC,
4690 };
4691 int ret;
4692
4693 dprintk("%s: begin!\n", __func__);
4694 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4695 fl->fl_u.nfs4_fl.owner,
4696 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4697 if (data == NULL)
4698 return -ENOMEM;
4699 if (IS_SETLKW(cmd))
4700 data->arg.block = 1;
4701 if (recovery_type > NFS_LOCK_NEW) {
4702 if (recovery_type == NFS_LOCK_RECLAIM)
4703 data->arg.reclaim = NFS_LOCK_RECLAIM;
4704 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4705 }
4706 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4707 msg.rpc_argp = &data->arg;
4708 msg.rpc_resp = &data->res;
4709 task_setup_data.callback_data = data;
4710 task = rpc_run_task(&task_setup_data);
4711 if (IS_ERR(task))
4712 return PTR_ERR(task);
4713 ret = nfs4_wait_for_completion_rpc_task(task);
4714 if (ret == 0) {
4715 ret = data->rpc_status;
4716 if (ret)
4717 nfs4_handle_setlk_error(data->server, data->lsp,
4718 data->arg.new_lock_owner, ret);
4719 } else
4720 data->cancelled = 1;
4721 rpc_put_task(task);
4722 dprintk("%s: done, ret = %d!\n", __func__, ret);
4723 return ret;
4724}
4725
4726static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4727{
4728 struct nfs_server *server = NFS_SERVER(state->inode);
4729 struct nfs4_exception exception = {
4730 .inode = state->inode,
4731 };
4732 int err;
4733
4734 do {
4735 /* Cache the lock if possible... */
4736 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4737 return 0;
4738 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4739 if (err != -NFS4ERR_DELAY)
4740 break;
4741 nfs4_handle_exception(server, err, &exception);
4742 } while (exception.retry);
4743 return err;
4744}
4745
4746static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4747{
4748 struct nfs_server *server = NFS_SERVER(state->inode);
4749 struct nfs4_exception exception = {
4750 .inode = state->inode,
4751 };
4752 int err;
4753
4754 err = nfs4_set_lock_state(state, request);
4755 if (err != 0)
4756 return err;
4757 do {
4758 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4759 return 0;
4760 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4761 switch (err) {
4762 default:
4763 goto out;
4764 case -NFS4ERR_GRACE:
4765 case -NFS4ERR_DELAY:
4766 nfs4_handle_exception(server, err, &exception);
4767 err = 0;
4768 }
4769 } while (exception.retry);
4770out:
4771 return err;
4772}
4773
4774#if defined(CONFIG_NFS_V4_1)
4775/**
4776 * nfs41_check_expired_locks - possibly free a lock stateid
4777 *
4778 * @state: NFSv4 state for an inode
4779 *
4780 * Returns NFS_OK if recovery for this stateid is now finished.
4781 * Otherwise a negative NFS4ERR value is returned.
4782 */
4783static int nfs41_check_expired_locks(struct nfs4_state *state)
4784{
4785 int status, ret = -NFS4ERR_BAD_STATEID;
4786 struct nfs4_lock_state *lsp;
4787 struct nfs_server *server = NFS_SERVER(state->inode);
4788
4789 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4790 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4791 status = nfs41_test_stateid(server, &lsp->ls_stateid);
4792 if (status != NFS_OK) {
4793 /* Free the stateid unless the server
4794 * informs us the stateid is unrecognized. */
4795 if (status != -NFS4ERR_BAD_STATEID)
4796 nfs41_free_stateid(server,
4797 &lsp->ls_stateid);
4798 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4799 ret = status;
4800 }
4801 }
4802 };
4803
4804 return ret;
4805}
4806
4807static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4808{
4809 int status = NFS_OK;
4810
4811 if (test_bit(LK_STATE_IN_USE, &state->flags))
4812 status = nfs41_check_expired_locks(state);
4813 if (status != NFS_OK)
4814 status = nfs4_lock_expired(state, request);
4815 return status;
4816}
4817#endif
4818
4819static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4820{
4821 struct nfs_inode *nfsi = NFS_I(state->inode);
4822 unsigned char fl_flags = request->fl_flags;
4823 int status = -ENOLCK;
4824
4825 if ((fl_flags & FL_POSIX) &&
4826 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4827 goto out;
4828 /* Is this a delegated open? */
4829 status = nfs4_set_lock_state(state, request);
4830 if (status != 0)
4831 goto out;
4832 request->fl_flags |= FL_ACCESS;
4833 status = do_vfs_lock(request->fl_file, request);
4834 if (status < 0)
4835 goto out;
4836 down_read(&nfsi->rwsem);
4837 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4838 /* Yes: cache locks! */
4839 /* ...but avoid races with delegation recall... */
4840 request->fl_flags = fl_flags & ~FL_SLEEP;
4841 status = do_vfs_lock(request->fl_file, request);
4842 goto out_unlock;
4843 }
4844 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4845 if (status != 0)
4846 goto out_unlock;
4847 /* Note: we always want to sleep here! */
4848 request->fl_flags = fl_flags | FL_SLEEP;
4849 if (do_vfs_lock(request->fl_file, request) < 0)
4850 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4851 "manager!\n", __func__);
4852out_unlock:
4853 up_read(&nfsi->rwsem);
4854out:
4855 request->fl_flags = fl_flags;
4856 return status;
4857}
4858
4859static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4860{
4861 struct nfs4_exception exception = {
4862 .state = state,
4863 .inode = state->inode,
4864 };
4865 int err;
4866
4867 do {
4868 err = _nfs4_proc_setlk(state, cmd, request);
4869 if (err == -NFS4ERR_DENIED)
4870 err = -EAGAIN;
4871 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4872 err, &exception);
4873 } while (exception.retry);
4874 return err;
4875}
4876
4877static int
4878nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4879{
4880 struct nfs_open_context *ctx;
4881 struct nfs4_state *state;
4882 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4883 int status;
4884
4885 /* verify open state */
4886 ctx = nfs_file_open_context(filp);
4887 state = ctx->state;
4888
4889 if (request->fl_start < 0 || request->fl_end < 0)
4890 return -EINVAL;
4891
4892 if (IS_GETLK(cmd)) {
4893 if (state != NULL)
4894 return nfs4_proc_getlk(state, F_GETLK, request);
4895 return 0;
4896 }
4897
4898 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4899 return -EINVAL;
4900
4901 if (request->fl_type == F_UNLCK) {
4902 if (state != NULL)
4903 return nfs4_proc_unlck(state, cmd, request);
4904 return 0;
4905 }
4906
4907 if (state == NULL)
4908 return -ENOLCK;
4909 /*
4910 * Don't rely on the VFS having checked the file open mode,
4911 * since it won't do this for flock() locks.
4912 */
4913 switch (request->fl_type) {
4914 case F_RDLCK:
4915 if (!(filp->f_mode & FMODE_READ))
4916 return -EBADF;
4917 break;
4918 case F_WRLCK:
4919 if (!(filp->f_mode & FMODE_WRITE))
4920 return -EBADF;
4921 }
4922
4923 do {
4924 status = nfs4_proc_setlk(state, cmd, request);
4925 if ((status != -EAGAIN) || IS_SETLK(cmd))
4926 break;
4927 timeout = nfs4_set_lock_task_retry(timeout);
4928 status = -ERESTARTSYS;
4929 if (signalled())
4930 break;
4931 } while(status < 0);
4932 return status;
4933}
4934
4935int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4936{
4937 struct nfs_server *server = NFS_SERVER(state->inode);
4938 struct nfs4_exception exception = { };
4939 int err;
4940
4941 err = nfs4_set_lock_state(state, fl);
4942 if (err != 0)
4943 goto out;
4944 do {
4945 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4946 switch (err) {
4947 default:
4948 printk(KERN_ERR "NFS: %s: unhandled error "
4949 "%d.\n", __func__, err);
4950 case 0:
4951 case -ESTALE:
4952 goto out;
4953 case -NFS4ERR_EXPIRED:
4954 nfs4_schedule_stateid_recovery(server, state);
4955 case -NFS4ERR_STALE_CLIENTID:
4956 case -NFS4ERR_STALE_STATEID:
4957 nfs4_schedule_lease_recovery(server->nfs_client);
4958 goto out;
4959 case -NFS4ERR_BADSESSION:
4960 case -NFS4ERR_BADSLOT:
4961 case -NFS4ERR_BAD_HIGH_SLOT:
4962 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4963 case -NFS4ERR_DEADSESSION:
4964 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4965 goto out;
4966 case -ERESTARTSYS:
4967 /*
4968 * The show must go on: exit, but mark the
4969 * stateid as needing recovery.
4970 */
4971 case -NFS4ERR_DELEG_REVOKED:
4972 case -NFS4ERR_ADMIN_REVOKED:
4973 case -NFS4ERR_BAD_STATEID:
4974 case -NFS4ERR_OPENMODE:
4975 nfs4_schedule_stateid_recovery(server, state);
4976 err = 0;
4977 goto out;
4978 case -EKEYEXPIRED:
4979 /*
4980 * User RPCSEC_GSS context has expired.
4981 * We cannot recover this stateid now, so
4982 * skip it and allow recovery thread to
4983 * proceed.
4984 */
4985 err = 0;
4986 goto out;
4987 case -ENOMEM:
4988 case -NFS4ERR_DENIED:
4989 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4990 err = 0;
4991 goto out;
4992 case -NFS4ERR_DELAY:
4993 break;
4994 }
4995 err = nfs4_handle_exception(server, err, &exception);
4996 } while (exception.retry);
4997out:
4998 return err;
4999}
5000
5001struct nfs_release_lockowner_data {
5002 struct nfs4_lock_state *lsp;
5003 struct nfs_server *server;
5004 struct nfs_release_lockowner_args args;
5005};
5006
5007static void nfs4_release_lockowner_release(void *calldata)
5008{
5009 struct nfs_release_lockowner_data *data = calldata;
5010 nfs4_free_lock_state(data->server, data->lsp);
5011 kfree(calldata);
5012}
5013
5014static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5015 .rpc_release = nfs4_release_lockowner_release,
5016};
5017
5018int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5019{
5020 struct nfs_server *server = lsp->ls_state->owner->so_server;
5021 struct nfs_release_lockowner_data *data;
5022 struct rpc_message msg = {
5023 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5024 };
5025
5026 if (server->nfs_client->cl_mvops->minor_version != 0)
5027 return -EINVAL;
5028 data = kmalloc(sizeof(*data), GFP_NOFS);
5029 if (!data)
5030 return -ENOMEM;
5031 data->lsp = lsp;
5032 data->server = server;
5033 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5034 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5035 data->args.lock_owner.s_dev = server->s_dev;
5036 msg.rpc_argp = &data->args;
5037 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5038 return 0;
5039}
5040
5041#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5042
5043static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5044 const void *buf, size_t buflen,
5045 int flags, int type)
5046{
5047 if (strcmp(key, "") != 0)
5048 return -EINVAL;
5049
5050 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5051}
5052
5053static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5054 void *buf, size_t buflen, int type)
5055{
5056 if (strcmp(key, "") != 0)
5057 return -EINVAL;
5058
5059 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5060}
5061
5062static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5063 size_t list_len, const char *name,
5064 size_t name_len, int type)
5065{
5066 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5067
5068 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5069 return 0;
5070
5071 if (list && len <= list_len)
5072 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5073 return len;
5074}
5075
5076/*
5077 * nfs_fhget will use either the mounted_on_fileid or the fileid
5078 */
5079static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5080{
5081 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5082 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5083 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5084 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5085 return;
5086
5087 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5088 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5089 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5090 fattr->nlink = 2;
5091}
5092
5093static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5094 const struct qstr *name,
5095 struct nfs4_fs_locations *fs_locations,
5096 struct page *page)
5097{
5098 struct nfs_server *server = NFS_SERVER(dir);
5099 u32 bitmask[2] = {
5100 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5101 };
5102 struct nfs4_fs_locations_arg args = {
5103 .dir_fh = NFS_FH(dir),
5104 .name = name,
5105 .page = page,
5106 .bitmask = bitmask,
5107 };
5108 struct nfs4_fs_locations_res res = {
5109 .fs_locations = fs_locations,
5110 };
5111 struct rpc_message msg = {
5112 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5113 .rpc_argp = &args,
5114 .rpc_resp = &res,
5115 };
5116 int status;
5117
5118 dprintk("%s: start\n", __func__);
5119
5120 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5121 * is not supported */
5122 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5123 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5124 else
5125 bitmask[0] |= FATTR4_WORD0_FILEID;
5126
5127 nfs_fattr_init(&fs_locations->fattr);
5128 fs_locations->server = server;
5129 fs_locations->nlocations = 0;
5130 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5131 dprintk("%s: returned status = %d\n", __func__, status);
5132 return status;
5133}
5134
5135int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5136 const struct qstr *name,
5137 struct nfs4_fs_locations *fs_locations,
5138 struct page *page)
5139{
5140 struct nfs4_exception exception = { };
5141 int err;
5142 do {
5143 err = nfs4_handle_exception(NFS_SERVER(dir),
5144 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5145 &exception);
5146 } while (exception.retry);
5147 return err;
5148}
5149
5150static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5151{
5152 int status;
5153 struct nfs4_secinfo_arg args = {
5154 .dir_fh = NFS_FH(dir),
5155 .name = name,
5156 };
5157 struct nfs4_secinfo_res res = {
5158 .flavors = flavors,
5159 };
5160 struct rpc_message msg = {
5161 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5162 .rpc_argp = &args,
5163 .rpc_resp = &res,
5164 };
5165
5166 dprintk("NFS call secinfo %s\n", name->name);
5167 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5168 dprintk("NFS reply secinfo: %d\n", status);
5169 return status;
5170}
5171
5172int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5173 struct nfs4_secinfo_flavors *flavors)
5174{
5175 struct nfs4_exception exception = { };
5176 int err;
5177 do {
5178 err = nfs4_handle_exception(NFS_SERVER(dir),
5179 _nfs4_proc_secinfo(dir, name, flavors),
5180 &exception);
5181 } while (exception.retry);
5182 return err;
5183}
5184
5185#ifdef CONFIG_NFS_V4_1
5186/*
5187 * Check the exchange flags returned by the server for invalid flags, having
5188 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5189 * DS flags set.
5190 */
5191static int nfs4_check_cl_exchange_flags(u32 flags)
5192{
5193 if (flags & ~EXCHGID4_FLAG_MASK_R)
5194 goto out_inval;
5195 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5196 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5197 goto out_inval;
5198 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5199 goto out_inval;
5200 return NFS_OK;
5201out_inval:
5202 return -NFS4ERR_INVAL;
5203}
5204
5205static bool
5206nfs41_same_server_scope(struct nfs41_server_scope *a,
5207 struct nfs41_server_scope *b)
5208{
5209 if (a->server_scope_sz == b->server_scope_sz &&
5210 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5211 return true;
5212
5213 return false;
5214}
5215
5216/*
5217 * nfs4_proc_bind_conn_to_session()
5218 *
5219 * The 4.1 client currently uses the same TCP connection for the
5220 * fore and backchannel.
5221 */
5222int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5223{
5224 int status;
5225 struct nfs41_bind_conn_to_session_res res;
5226 struct rpc_message msg = {
5227 .rpc_proc =
5228 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5229 .rpc_argp = clp,
5230 .rpc_resp = &res,
5231 .rpc_cred = cred,
5232 };
5233
5234 dprintk("--> %s\n", __func__);
5235
5236 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5237 if (unlikely(res.session == NULL)) {
5238 status = -ENOMEM;
5239 goto out;
5240 }
5241
5242 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5243 if (status == 0) {
5244 if (memcmp(res.session->sess_id.data,
5245 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5246 dprintk("NFS: %s: Session ID mismatch\n", __func__);
5247 status = -EIO;
5248 goto out_session;
5249 }
5250 if (res.dir != NFS4_CDFS4_BOTH) {
5251 dprintk("NFS: %s: Unexpected direction from server\n",
5252 __func__);
5253 status = -EIO;
5254 goto out_session;
5255 }
5256 if (res.use_conn_in_rdma_mode) {
5257 dprintk("NFS: %s: Server returned RDMA mode = true\n",
5258 __func__);
5259 status = -EIO;
5260 goto out_session;
5261 }
5262 }
5263out_session:
5264 kfree(res.session);
5265out:
5266 dprintk("<-- %s status= %d\n", __func__, status);
5267 return status;
5268}
5269
5270/*
5271 * nfs4_proc_exchange_id()
5272 *
5273 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5274 *
5275 * Since the clientid has expired, all compounds using sessions
5276 * associated with the stale clientid will be returning
5277 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5278 * be in some phase of session reset.
5279 */
5280int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5281{
5282 nfs4_verifier verifier;
5283 struct nfs41_exchange_id_args args = {
5284 .verifier = &verifier,
5285 .client = clp,
5286 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5287 };
5288 struct nfs41_exchange_id_res res = {
5289 0
5290 };
5291 int status;
5292 struct rpc_message msg = {
5293 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5294 .rpc_argp = &args,
5295 .rpc_resp = &res,
5296 .rpc_cred = cred,
5297 };
5298
5299 nfs4_init_boot_verifier(clp, &verifier);
5300 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5301 sizeof(args.id));
5302 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
5303 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5304 args.id_len, args.id);
5305
5306 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5307 GFP_NOFS);
5308 if (unlikely(res.server_owner == NULL)) {
5309 status = -ENOMEM;
5310 goto out;
5311 }
5312
5313 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5314 GFP_NOFS);
5315 if (unlikely(res.server_scope == NULL)) {
5316 status = -ENOMEM;
5317 goto out_server_owner;
5318 }
5319
5320 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5321 if (unlikely(res.impl_id == NULL)) {
5322 status = -ENOMEM;
5323 goto out_server_scope;
5324 }
5325
5326 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5327 if (status == 0)
5328 status = nfs4_check_cl_exchange_flags(res.flags);
5329
5330 if (status == 0) {
5331 clp->cl_clientid = res.clientid;
5332 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5333 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5334 clp->cl_seqid = res.seqid;
5335
5336 kfree(clp->cl_serverowner);
5337 clp->cl_serverowner = res.server_owner;
5338 res.server_owner = NULL;
5339
5340 /* use the most recent implementation id */
5341 kfree(clp->cl_implid);
5342 clp->cl_implid = res.impl_id;
5343
5344 if (clp->cl_serverscope != NULL &&
5345 !nfs41_same_server_scope(clp->cl_serverscope,
5346 res.server_scope)) {
5347 dprintk("%s: server_scope mismatch detected\n",
5348 __func__);
5349 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5350 kfree(clp->cl_serverscope);
5351 clp->cl_serverscope = NULL;
5352 }
5353
5354 if (clp->cl_serverscope == NULL) {
5355 clp->cl_serverscope = res.server_scope;
5356 goto out;
5357 }
5358 } else
5359 kfree(res.impl_id);
5360
5361out_server_owner:
5362 kfree(res.server_owner);
5363out_server_scope:
5364 kfree(res.server_scope);
5365out:
5366 if (clp->cl_implid != NULL)
5367 dprintk("NFS reply exchange_id: Server Implementation ID: "
5368 "domain: %s, name: %s, date: %llu,%u\n",
5369 clp->cl_implid->domain, clp->cl_implid->name,
5370 clp->cl_implid->date.seconds,
5371 clp->cl_implid->date.nseconds);
5372 dprintk("NFS reply exchange_id: %d\n", status);
5373 return status;
5374}
5375
5376static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5377 struct rpc_cred *cred)
5378{
5379 struct rpc_message msg = {
5380 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5381 .rpc_argp = clp,
5382 .rpc_cred = cred,
5383 };
5384 int status;
5385
5386 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5387 if (status)
5388 dprintk("NFS: Got error %d from the server %s on "
5389 "DESTROY_CLIENTID.", status, clp->cl_hostname);
5390 return status;
5391}
5392
5393static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5394 struct rpc_cred *cred)
5395{
5396 unsigned int loop;
5397 int ret;
5398
5399 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5400 ret = _nfs4_proc_destroy_clientid(clp, cred);
5401 switch (ret) {
5402 case -NFS4ERR_DELAY:
5403 case -NFS4ERR_CLIENTID_BUSY:
5404 ssleep(1);
5405 break;
5406 default:
5407 return ret;
5408 }
5409 }
5410 return 0;
5411}
5412
5413int nfs4_destroy_clientid(struct nfs_client *clp)
5414{
5415 struct rpc_cred *cred;
5416 int ret = 0;
5417
5418 if (clp->cl_mvops->minor_version < 1)
5419 goto out;
5420 if (clp->cl_exchange_flags == 0)
5421 goto out;
5422 if (clp->cl_preserve_clid)
5423 goto out;
5424 cred = nfs4_get_exchange_id_cred(clp);
5425 ret = nfs4_proc_destroy_clientid(clp, cred);
5426 if (cred)
5427 put_rpccred(cred);
5428 switch (ret) {
5429 case 0:
5430 case -NFS4ERR_STALE_CLIENTID:
5431 clp->cl_exchange_flags = 0;
5432 }
5433out:
5434 return ret;
5435}
5436
5437struct nfs4_get_lease_time_data {
5438 struct nfs4_get_lease_time_args *args;
5439 struct nfs4_get_lease_time_res *res;
5440 struct nfs_client *clp;
5441};
5442
5443static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5444 void *calldata)
5445{
5446 struct nfs4_get_lease_time_data *data =
5447 (struct nfs4_get_lease_time_data *)calldata;
5448
5449 dprintk("--> %s\n", __func__);
5450 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5451 /* just setup sequence, do not trigger session recovery
5452 since we're invoked within one */
5453 nfs41_setup_sequence(data->clp->cl_session,
5454 &data->args->la_seq_args,
5455 &data->res->lr_seq_res,
5456 task);
5457 dprintk("<-- %s\n", __func__);
5458}
5459
5460/*
5461 * Called from nfs4_state_manager thread for session setup, so don't recover
5462 * from sequence operation or clientid errors.
5463 */
5464static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5465{
5466 struct nfs4_get_lease_time_data *data =
5467 (struct nfs4_get_lease_time_data *)calldata;
5468
5469 dprintk("--> %s\n", __func__);
5470 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5471 return;
5472 switch (task->tk_status) {
5473 case -NFS4ERR_DELAY:
5474 case -NFS4ERR_GRACE:
5475 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5476 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5477 task->tk_status = 0;
5478 /* fall through */
5479 case -NFS4ERR_RETRY_UNCACHED_REP:
5480 rpc_restart_call_prepare(task);
5481 return;
5482 }
5483 dprintk("<-- %s\n", __func__);
5484}
5485
5486static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5487 .rpc_call_prepare = nfs4_get_lease_time_prepare,
5488 .rpc_call_done = nfs4_get_lease_time_done,
5489};
5490
5491int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5492{
5493 struct rpc_task *task;
5494 struct nfs4_get_lease_time_args args;
5495 struct nfs4_get_lease_time_res res = {
5496 .lr_fsinfo = fsinfo,
5497 };
5498 struct nfs4_get_lease_time_data data = {
5499 .args = &args,
5500 .res = &res,
5501 .clp = clp,
5502 };
5503 struct rpc_message msg = {
5504 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5505 .rpc_argp = &args,
5506 .rpc_resp = &res,
5507 };
5508 struct rpc_task_setup task_setup = {
5509 .rpc_client = clp->cl_rpcclient,
5510 .rpc_message = &msg,
5511 .callback_ops = &nfs4_get_lease_time_ops,
5512 .callback_data = &data,
5513 .flags = RPC_TASK_TIMEOUT,
5514 };
5515 int status;
5516
5517 nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5518 dprintk("--> %s\n", __func__);
5519 task = rpc_run_task(&task_setup);
5520
5521 if (IS_ERR(task))
5522 status = PTR_ERR(task);
5523 else {
5524 status = task->tk_status;
5525 rpc_put_task(task);
5526 }
5527 dprintk("<-- %s return %d\n", __func__, status);
5528
5529 return status;
5530}
5531
5532/*
5533 * Initialize the values to be used by the client in CREATE_SESSION
5534 * If nfs4_init_session set the fore channel request and response sizes,
5535 * use them.
5536 *
5537 * Set the back channel max_resp_sz_cached to zero to force the client to
5538 * always set csa_cachethis to FALSE because the current implementation
5539 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5540 */
5541static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5542{
5543 struct nfs4_session *session = args->client->cl_session;
5544 unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5545 mxresp_sz = session->fc_target_max_resp_sz;
5546
5547 if (mxrqst_sz == 0)
5548 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5549 if (mxresp_sz == 0)
5550 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5551 /* Fore channel attributes */
5552 args->fc_attrs.max_rqst_sz = mxrqst_sz;
5553 args->fc_attrs.max_resp_sz = mxresp_sz;
5554 args->fc_attrs.max_ops = NFS4_MAX_OPS;
5555 args->fc_attrs.max_reqs = max_session_slots;
5556
5557 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5558 "max_ops=%u max_reqs=%u\n",
5559 __func__,
5560 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5561 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5562
5563 /* Back channel attributes */
5564 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5565 args->bc_attrs.max_resp_sz = PAGE_SIZE;
5566 args->bc_attrs.max_resp_sz_cached = 0;
5567 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5568 args->bc_attrs.max_reqs = 1;
5569
5570 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5571 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5572 __func__,
5573 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5574 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5575 args->bc_attrs.max_reqs);
5576}
5577
5578static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5579{
5580 struct nfs4_channel_attrs *sent = &args->fc_attrs;
5581 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5582
5583 if (rcvd->max_resp_sz > sent->max_resp_sz)
5584 return -EINVAL;
5585 /*
5586 * Our requested max_ops is the minimum we need; we're not
5587 * prepared to break up compounds into smaller pieces than that.
5588 * So, no point even trying to continue if the server won't
5589 * cooperate:
5590 */
5591 if (rcvd->max_ops < sent->max_ops)
5592 return -EINVAL;
5593 if (rcvd->max_reqs == 0)
5594 return -EINVAL;
5595 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5596 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5597 return 0;
5598}
5599
5600static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5601{
5602 struct nfs4_channel_attrs *sent = &args->bc_attrs;
5603 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5604
5605 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5606 return -EINVAL;
5607 if (rcvd->max_resp_sz < sent->max_resp_sz)
5608 return -EINVAL;
5609 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5610 return -EINVAL;
5611 /* These would render the backchannel useless: */
5612 if (rcvd->max_ops != sent->max_ops)
5613 return -EINVAL;
5614 if (rcvd->max_reqs != sent->max_reqs)
5615 return -EINVAL;
5616 return 0;
5617}
5618
5619static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5620 struct nfs4_session *session)
5621{
5622 int ret;
5623
5624 ret = nfs4_verify_fore_channel_attrs(args, session);
5625 if (ret)
5626 return ret;
5627 return nfs4_verify_back_channel_attrs(args, session);
5628}
5629
5630static int _nfs4_proc_create_session(struct nfs_client *clp,
5631 struct rpc_cred *cred)
5632{
5633 struct nfs4_session *session = clp->cl_session;
5634 struct nfs41_create_session_args args = {
5635 .client = clp,
5636 .cb_program = NFS4_CALLBACK,
5637 };
5638 struct nfs41_create_session_res res = {
5639 .client = clp,
5640 };
5641 struct rpc_message msg = {
5642 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5643 .rpc_argp = &args,
5644 .rpc_resp = &res,
5645 .rpc_cred = cred,
5646 };
5647 int status;
5648
5649 nfs4_init_channel_attrs(&args);
5650 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5651
5652 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5653
5654 if (!status) {
5655 /* Verify the session's negotiated channel_attrs values */
5656 status = nfs4_verify_channel_attrs(&args, session);
5657 /* Increment the clientid slot sequence id */
5658 clp->cl_seqid++;
5659 }
5660
5661 return status;
5662}
5663
5664/*
5665 * Issues a CREATE_SESSION operation to the server.
5666 * It is the responsibility of the caller to verify the session is
5667 * expired before calling this routine.
5668 */
5669int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5670{
5671 int status;
5672 unsigned *ptr;
5673 struct nfs4_session *session = clp->cl_session;
5674
5675 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5676
5677 status = _nfs4_proc_create_session(clp, cred);
5678 if (status)
5679 goto out;
5680
5681 /* Init or reset the session slot tables */
5682 status = nfs4_setup_session_slot_tables(session);
5683 dprintk("slot table setup returned %d\n", status);
5684 if (status)
5685 goto out;
5686
5687 ptr = (unsigned *)&session->sess_id.data[0];
5688 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5689 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5690out:
5691 dprintk("<-- %s\n", __func__);
5692 return status;
5693}
5694
5695/*
5696 * Issue the over-the-wire RPC DESTROY_SESSION.
5697 * The caller must serialize access to this routine.
5698 */
5699int nfs4_proc_destroy_session(struct nfs4_session *session,
5700 struct rpc_cred *cred)
5701{
5702 struct rpc_message msg = {
5703 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5704 .rpc_argp = session,
5705 .rpc_cred = cred,
5706 };
5707 int status = 0;
5708
5709 dprintk("--> nfs4_proc_destroy_session\n");
5710
5711 /* session is still being setup */
5712 if (session->clp->cl_cons_state != NFS_CS_READY)
5713 return status;
5714
5715 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5716
5717 if (status)
5718 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5719 "Session has been destroyed regardless...\n", status);
5720
5721 dprintk("<-- nfs4_proc_destroy_session\n");
5722 return status;
5723}
5724
5725/*
5726 * Renew the cl_session lease.
5727 */
5728struct nfs4_sequence_data {
5729 struct nfs_client *clp;
5730 struct nfs4_sequence_args args;
5731 struct nfs4_sequence_res res;
5732};
5733
5734static void nfs41_sequence_release(void *data)
5735{
5736 struct nfs4_sequence_data *calldata = data;
5737 struct nfs_client *clp = calldata->clp;
5738
5739 if (atomic_read(&clp->cl_count) > 1)
5740 nfs4_schedule_state_renewal(clp);
5741 nfs_put_client(clp);
5742 kfree(calldata);
5743}
5744
5745static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5746{
5747 switch(task->tk_status) {
5748 case -NFS4ERR_DELAY:
5749 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5750 return -EAGAIN;
5751 default:
5752 nfs4_schedule_lease_recovery(clp);
5753 }
5754 return 0;
5755}
5756
5757static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5758{
5759 struct nfs4_sequence_data *calldata = data;
5760 struct nfs_client *clp = calldata->clp;
5761
5762 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5763 return;
5764
5765 if (task->tk_status < 0) {
5766 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5767 if (atomic_read(&clp->cl_count) == 1)
5768 goto out;
5769
5770 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5771 rpc_restart_call_prepare(task);
5772 return;
5773 }
5774 }
5775 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5776out:
5777 dprintk("<-- %s\n", __func__);
5778}
5779
5780static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5781{
5782 struct nfs4_sequence_data *calldata = data;
5783 struct nfs_client *clp = calldata->clp;
5784 struct nfs4_sequence_args *args;
5785 struct nfs4_sequence_res *res;
5786
5787 args = task->tk_msg.rpc_argp;
5788 res = task->tk_msg.rpc_resp;
5789
5790 nfs41_setup_sequence(clp->cl_session, args, res, task);
5791}
5792
5793static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
5794{
5795 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5796 nfs41_sequence_prepare(task, data);
5797}
5798
5799static const struct rpc_call_ops nfs41_sequence_ops = {
5800 .rpc_call_done = nfs41_sequence_call_done,
5801 .rpc_call_prepare = nfs41_sequence_prepare,
5802 .rpc_release = nfs41_sequence_release,
5803};
5804
5805static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
5806 .rpc_call_done = nfs41_sequence_call_done,
5807 .rpc_call_prepare = nfs41_sequence_prepare_privileged,
5808 .rpc_release = nfs41_sequence_release,
5809};
5810
5811static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
5812 const struct rpc_call_ops *seq_ops)
5813{
5814 struct nfs4_sequence_data *calldata;
5815 struct rpc_message msg = {
5816 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5817 .rpc_cred = cred,
5818 };
5819 struct rpc_task_setup task_setup_data = {
5820 .rpc_client = clp->cl_rpcclient,
5821 .rpc_message = &msg,
5822 .callback_ops = seq_ops,
5823 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5824 };
5825
5826 if (!atomic_inc_not_zero(&clp->cl_count))
5827 return ERR_PTR(-EIO);
5828 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5829 if (calldata == NULL) {
5830 nfs_put_client(clp);
5831 return ERR_PTR(-ENOMEM);
5832 }
5833 nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5834 msg.rpc_argp = &calldata->args;
5835 msg.rpc_resp = &calldata->res;
5836 calldata->clp = clp;
5837 task_setup_data.callback_data = calldata;
5838
5839 return rpc_run_task(&task_setup_data);
5840}
5841
5842static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5843{
5844 struct rpc_task *task;
5845 int ret = 0;
5846
5847 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5848 return 0;
5849 task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
5850 if (IS_ERR(task))
5851 ret = PTR_ERR(task);
5852 else
5853 rpc_put_task_async(task);
5854 dprintk("<-- %s status=%d\n", __func__, ret);
5855 return ret;
5856}
5857
5858static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5859{
5860 struct rpc_task *task;
5861 int ret;
5862
5863 task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
5864 if (IS_ERR(task)) {
5865 ret = PTR_ERR(task);
5866 goto out;
5867 }
5868 ret = rpc_wait_for_completion_task(task);
5869 if (!ret) {
5870 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5871
5872 if (task->tk_status == 0)
5873 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5874 ret = task->tk_status;
5875 }
5876 rpc_put_task(task);
5877out:
5878 dprintk("<-- %s status=%d\n", __func__, ret);
5879 return ret;
5880}
5881
5882struct nfs4_reclaim_complete_data {
5883 struct nfs_client *clp;
5884 struct nfs41_reclaim_complete_args arg;
5885 struct nfs41_reclaim_complete_res res;
5886};
5887
5888static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5889{
5890 struct nfs4_reclaim_complete_data *calldata = data;
5891
5892 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5893 nfs41_setup_sequence(calldata->clp->cl_session,
5894 &calldata->arg.seq_args,
5895 &calldata->res.seq_res,
5896 task);
5897}
5898
5899static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5900{
5901 switch(task->tk_status) {
5902 case 0:
5903 case -NFS4ERR_COMPLETE_ALREADY:
5904 case -NFS4ERR_WRONG_CRED: /* What to do here? */
5905 break;
5906 case -NFS4ERR_DELAY:
5907 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5908 /* fall through */
5909 case -NFS4ERR_RETRY_UNCACHED_REP:
5910 return -EAGAIN;
5911 default:
5912 nfs4_schedule_lease_recovery(clp);
5913 }
5914 return 0;
5915}
5916
5917static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5918{
5919 struct nfs4_reclaim_complete_data *calldata = data;
5920 struct nfs_client *clp = calldata->clp;
5921 struct nfs4_sequence_res *res = &calldata->res.seq_res;
5922
5923 dprintk("--> %s\n", __func__);
5924 if (!nfs41_sequence_done(task, res))
5925 return;
5926
5927 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5928 rpc_restart_call_prepare(task);
5929 return;
5930 }
5931 dprintk("<-- %s\n", __func__);
5932}
5933
5934static void nfs4_free_reclaim_complete_data(void *data)
5935{
5936 struct nfs4_reclaim_complete_data *calldata = data;
5937
5938 kfree(calldata);
5939}
5940
5941static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5942 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5943 .rpc_call_done = nfs4_reclaim_complete_done,
5944 .rpc_release = nfs4_free_reclaim_complete_data,
5945};
5946
5947/*
5948 * Issue a global reclaim complete.
5949 */
5950static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5951{
5952 struct nfs4_reclaim_complete_data *calldata;
5953 struct rpc_task *task;
5954 struct rpc_message msg = {
5955 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5956 };
5957 struct rpc_task_setup task_setup_data = {
5958 .rpc_client = clp->cl_rpcclient,
5959 .rpc_message = &msg,
5960 .callback_ops = &nfs4_reclaim_complete_call_ops,
5961 .flags = RPC_TASK_ASYNC,
5962 };
5963 int status = -ENOMEM;
5964
5965 dprintk("--> %s\n", __func__);
5966 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5967 if (calldata == NULL)
5968 goto out;
5969 calldata->clp = clp;
5970 calldata->arg.one_fs = 0;
5971
5972 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5973 msg.rpc_argp = &calldata->arg;
5974 msg.rpc_resp = &calldata->res;
5975 task_setup_data.callback_data = calldata;
5976 task = rpc_run_task(&task_setup_data);
5977 if (IS_ERR(task)) {
5978 status = PTR_ERR(task);
5979 goto out;
5980 }
5981 status = nfs4_wait_for_completion_rpc_task(task);
5982 if (status == 0)
5983 status = task->tk_status;
5984 rpc_put_task(task);
5985 return 0;
5986out:
5987 dprintk("<-- %s status=%d\n", __func__, status);
5988 return status;
5989}
5990
5991static void
5992nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5993{
5994 struct nfs4_layoutget *lgp = calldata;
5995 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5996 struct nfs4_session *session = nfs4_get_session(server);
5997
5998 dprintk("--> %s\n", __func__);
5999 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6000 * right now covering the LAYOUTGET we are about to send.
6001 * However, that is not so catastrophic, and there seems
6002 * to be no way to prevent it completely.
6003 */
6004 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6005 &lgp->res.seq_res, task))
6006 return;
6007 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6008 NFS_I(lgp->args.inode)->layout,
6009 lgp->args.ctx->state)) {
6010 rpc_exit(task, NFS4_OK);
6011 }
6012}
6013
6014static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6015{
6016 struct nfs4_layoutget *lgp = calldata;
6017 struct inode *inode = lgp->args.inode;
6018 struct nfs_server *server = NFS_SERVER(inode);
6019 struct pnfs_layout_hdr *lo;
6020 struct nfs4_state *state = NULL;
6021
6022 dprintk("--> %s\n", __func__);
6023
6024 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6025 goto out;
6026
6027 switch (task->tk_status) {
6028 case 0:
6029 goto out;
6030 case -NFS4ERR_LAYOUTTRYLATER:
6031 case -NFS4ERR_RECALLCONFLICT:
6032 task->tk_status = -NFS4ERR_DELAY;
6033 break;
6034 case -NFS4ERR_EXPIRED:
6035 case -NFS4ERR_BAD_STATEID:
6036 spin_lock(&inode->i_lock);
6037 lo = NFS_I(inode)->layout;
6038 if (!lo || list_empty(&lo->plh_segs)) {
6039 spin_unlock(&inode->i_lock);
6040 /* If the open stateid was bad, then recover it. */
6041 state = lgp->args.ctx->state;
6042 } else {
6043 LIST_HEAD(head);
6044
6045 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6046 spin_unlock(&inode->i_lock);
6047 /* Mark the bad layout state as invalid, then
6048 * retry using the open stateid. */
6049 pnfs_free_lseg_list(&head);
6050 }
6051 }
6052 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6053 rpc_restart_call_prepare(task);
6054out:
6055 dprintk("<-- %s\n", __func__);
6056}
6057
6058static size_t max_response_pages(struct nfs_server *server)
6059{
6060 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6061 return nfs_page_array_len(0, max_resp_sz);
6062}
6063
6064static void nfs4_free_pages(struct page **pages, size_t size)
6065{
6066 int i;
6067
6068 if (!pages)
6069 return;
6070
6071 for (i = 0; i < size; i++) {
6072 if (!pages[i])
6073 break;
6074 __free_page(pages[i]);
6075 }
6076 kfree(pages);
6077}
6078
6079static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6080{
6081 struct page **pages;
6082 int i;
6083
6084 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6085 if (!pages) {
6086 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6087 return NULL;
6088 }
6089
6090 for (i = 0; i < size; i++) {
6091 pages[i] = alloc_page(gfp_flags);
6092 if (!pages[i]) {
6093 dprintk("%s: failed to allocate page\n", __func__);
6094 nfs4_free_pages(pages, size);
6095 return NULL;
6096 }
6097 }
6098
6099 return pages;
6100}
6101
6102static void nfs4_layoutget_release(void *calldata)
6103{
6104 struct nfs4_layoutget *lgp = calldata;
6105 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6106 size_t max_pages = max_response_pages(server);
6107
6108 dprintk("--> %s\n", __func__);
6109 nfs4_free_pages(lgp->args.layout.pages, max_pages);
6110 put_nfs_open_context(lgp->args.ctx);
6111 kfree(calldata);
6112 dprintk("<-- %s\n", __func__);
6113}
6114
6115static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6116 .rpc_call_prepare = nfs4_layoutget_prepare,
6117 .rpc_call_done = nfs4_layoutget_done,
6118 .rpc_release = nfs4_layoutget_release,
6119};
6120
6121struct pnfs_layout_segment *
6122nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6123{
6124 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6125 size_t max_pages = max_response_pages(server);
6126 struct rpc_task *task;
6127 struct rpc_message msg = {
6128 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6129 .rpc_argp = &lgp->args,
6130 .rpc_resp = &lgp->res,
6131 };
6132 struct rpc_task_setup task_setup_data = {
6133 .rpc_client = server->client,
6134 .rpc_message = &msg,
6135 .callback_ops = &nfs4_layoutget_call_ops,
6136 .callback_data = lgp,
6137 .flags = RPC_TASK_ASYNC,
6138 };
6139 struct pnfs_layout_segment *lseg = NULL;
6140 int status = 0;
6141
6142 dprintk("--> %s\n", __func__);
6143
6144 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6145 if (!lgp->args.layout.pages) {
6146 nfs4_layoutget_release(lgp);
6147 return ERR_PTR(-ENOMEM);
6148 }
6149 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6150
6151 lgp->res.layoutp = &lgp->args.layout;
6152 lgp->res.seq_res.sr_slot = NULL;
6153 nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6154 task = rpc_run_task(&task_setup_data);
6155 if (IS_ERR(task))
6156 return ERR_CAST(task);
6157 status = nfs4_wait_for_completion_rpc_task(task);
6158 if (status == 0)
6159 status = task->tk_status;
6160 if (status == 0)
6161 lseg = pnfs_layout_process(lgp);
6162 rpc_put_task(task);
6163 dprintk("<-- %s status=%d\n", __func__, status);
6164 if (status)
6165 return ERR_PTR(status);
6166 return lseg;
6167}
6168
6169static void
6170nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6171{
6172 struct nfs4_layoutreturn *lrp = calldata;
6173
6174 dprintk("--> %s\n", __func__);
6175 nfs41_setup_sequence(lrp->clp->cl_session,
6176 &lrp->args.seq_args,
6177 &lrp->res.seq_res,
6178 task);
6179}
6180
6181static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6182{
6183 struct nfs4_layoutreturn *lrp = calldata;
6184 struct nfs_server *server;
6185
6186 dprintk("--> %s\n", __func__);
6187
6188 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6189 return;
6190
6191 server = NFS_SERVER(lrp->args.inode);
6192 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6193 rpc_restart_call_prepare(task);
6194 return;
6195 }
6196 dprintk("<-- %s\n", __func__);
6197}
6198
6199static void nfs4_layoutreturn_release(void *calldata)
6200{
6201 struct nfs4_layoutreturn *lrp = calldata;
6202 struct pnfs_layout_hdr *lo = lrp->args.layout;
6203
6204 dprintk("--> %s\n", __func__);
6205 spin_lock(&lo->plh_inode->i_lock);
6206 if (lrp->res.lrs_present)
6207 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6208 lo->plh_block_lgets--;
6209 spin_unlock(&lo->plh_inode->i_lock);
6210 pnfs_put_layout_hdr(lrp->args.layout);
6211 kfree(calldata);
6212 dprintk("<-- %s\n", __func__);
6213}
6214
6215static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6216 .rpc_call_prepare = nfs4_layoutreturn_prepare,
6217 .rpc_call_done = nfs4_layoutreturn_done,
6218 .rpc_release = nfs4_layoutreturn_release,
6219};
6220
6221int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6222{
6223 struct rpc_task *task;
6224 struct rpc_message msg = {
6225 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6226 .rpc_argp = &lrp->args,
6227 .rpc_resp = &lrp->res,
6228 };
6229 struct rpc_task_setup task_setup_data = {
6230 .rpc_client = lrp->clp->cl_rpcclient,
6231 .rpc_message = &msg,
6232 .callback_ops = &nfs4_layoutreturn_call_ops,
6233 .callback_data = lrp,
6234 };
6235 int status;
6236
6237 dprintk("--> %s\n", __func__);
6238 nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6239 task = rpc_run_task(&task_setup_data);
6240 if (IS_ERR(task))
6241 return PTR_ERR(task);
6242 status = task->tk_status;
6243 dprintk("<-- %s status=%d\n", __func__, status);
6244 rpc_put_task(task);
6245 return status;
6246}
6247
6248/*
6249 * Retrieve the list of Data Server devices from the MDS.
6250 */
6251static int _nfs4_getdevicelist(struct nfs_server *server,
6252 const struct nfs_fh *fh,
6253 struct pnfs_devicelist *devlist)
6254{
6255 struct nfs4_getdevicelist_args args = {
6256 .fh = fh,
6257 .layoutclass = server->pnfs_curr_ld->id,
6258 };
6259 struct nfs4_getdevicelist_res res = {
6260 .devlist = devlist,
6261 };
6262 struct rpc_message msg = {
6263 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6264 .rpc_argp = &args,
6265 .rpc_resp = &res,
6266 };
6267 int status;
6268
6269 dprintk("--> %s\n", __func__);
6270 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6271 &res.seq_res, 0);
6272 dprintk("<-- %s status=%d\n", __func__, status);
6273 return status;
6274}
6275
6276int nfs4_proc_getdevicelist(struct nfs_server *server,
6277 const struct nfs_fh *fh,
6278 struct pnfs_devicelist *devlist)
6279{
6280 struct nfs4_exception exception = { };
6281 int err;
6282
6283 do {
6284 err = nfs4_handle_exception(server,
6285 _nfs4_getdevicelist(server, fh, devlist),
6286 &exception);
6287 } while (exception.retry);
6288
6289 dprintk("%s: err=%d, num_devs=%u\n", __func__,
6290 err, devlist->num_devs);
6291
6292 return err;
6293}
6294EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6295
6296static int
6297_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6298{
6299 struct nfs4_getdeviceinfo_args args = {
6300 .pdev = pdev,
6301 };
6302 struct nfs4_getdeviceinfo_res res = {
6303 .pdev = pdev,
6304 };
6305 struct rpc_message msg = {
6306 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6307 .rpc_argp = &args,
6308 .rpc_resp = &res,
6309 };
6310 int status;
6311
6312 dprintk("--> %s\n", __func__);
6313 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6314 dprintk("<-- %s status=%d\n", __func__, status);
6315
6316 return status;
6317}
6318
6319int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6320{
6321 struct nfs4_exception exception = { };
6322 int err;
6323
6324 do {
6325 err = nfs4_handle_exception(server,
6326 _nfs4_proc_getdeviceinfo(server, pdev),
6327 &exception);
6328 } while (exception.retry);
6329 return err;
6330}
6331EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6332
6333static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6334{
6335 struct nfs4_layoutcommit_data *data = calldata;
6336 struct nfs_server *server = NFS_SERVER(data->args.inode);
6337 struct nfs4_session *session = nfs4_get_session(server);
6338
6339 nfs41_setup_sequence(session,
6340 &data->args.seq_args,
6341 &data->res.seq_res,
6342 task);
6343}
6344
6345static void
6346nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6347{
6348 struct nfs4_layoutcommit_data *data = calldata;
6349 struct nfs_server *server = NFS_SERVER(data->args.inode);
6350
6351 if (!nfs41_sequence_done(task, &data->res.seq_res))
6352 return;
6353
6354 switch (task->tk_status) { /* Just ignore these failures */
6355 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6356 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
6357 case -NFS4ERR_BADLAYOUT: /* no layout */
6358 case -NFS4ERR_GRACE: /* loca_recalim always false */
6359 task->tk_status = 0;
6360 break;
6361 case 0:
6362 nfs_post_op_update_inode_force_wcc(data->args.inode,
6363 data->res.fattr);
6364 break;
6365 default:
6366 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6367 rpc_restart_call_prepare(task);
6368 return;
6369 }
6370 }
6371}
6372
6373static void nfs4_layoutcommit_release(void *calldata)
6374{
6375 struct nfs4_layoutcommit_data *data = calldata;
6376 struct pnfs_layout_segment *lseg, *tmp;
6377 unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6378
6379 pnfs_cleanup_layoutcommit(data);
6380 /* Matched by references in pnfs_set_layoutcommit */
6381 list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6382 list_del_init(&lseg->pls_lc_list);
6383 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6384 &lseg->pls_flags))
6385 pnfs_put_lseg(lseg);
6386 }
6387
6388 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6389 smp_mb__after_clear_bit();
6390 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6391
6392 put_rpccred(data->cred);
6393 kfree(data);
6394}
6395
6396static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6397 .rpc_call_prepare = nfs4_layoutcommit_prepare,
6398 .rpc_call_done = nfs4_layoutcommit_done,
6399 .rpc_release = nfs4_layoutcommit_release,
6400};
6401
6402int
6403nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6404{
6405 struct rpc_message msg = {
6406 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6407 .rpc_argp = &data->args,
6408 .rpc_resp = &data->res,
6409 .rpc_cred = data->cred,
6410 };
6411 struct rpc_task_setup task_setup_data = {
6412 .task = &data->task,
6413 .rpc_client = NFS_CLIENT(data->args.inode),
6414 .rpc_message = &msg,
6415 .callback_ops = &nfs4_layoutcommit_ops,
6416 .callback_data = data,
6417 .flags = RPC_TASK_ASYNC,
6418 };
6419 struct rpc_task *task;
6420 int status = 0;
6421
6422 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6423 "lbw: %llu inode %lu\n",
6424 data->task.tk_pid, sync,
6425 data->args.lastbytewritten,
6426 data->args.inode->i_ino);
6427
6428 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6429 task = rpc_run_task(&task_setup_data);
6430 if (IS_ERR(task))
6431 return PTR_ERR(task);
6432 if (sync == false)
6433 goto out;
6434 status = nfs4_wait_for_completion_rpc_task(task);
6435 if (status != 0)
6436 goto out;
6437 status = task->tk_status;
6438out:
6439 dprintk("%s: status %d\n", __func__, status);
6440 rpc_put_task(task);
6441 return status;
6442}
6443
6444static int
6445_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6446 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6447{
6448 struct nfs41_secinfo_no_name_args args = {
6449 .style = SECINFO_STYLE_CURRENT_FH,
6450 };
6451 struct nfs4_secinfo_res res = {
6452 .flavors = flavors,
6453 };
6454 struct rpc_message msg = {
6455 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6456 .rpc_argp = &args,
6457 .rpc_resp = &res,
6458 };
6459 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6460}
6461
6462static int
6463nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6464 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6465{
6466 struct nfs4_exception exception = { };
6467 int err;
6468 do {
6469 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6470 switch (err) {
6471 case 0:
6472 case -NFS4ERR_WRONGSEC:
6473 case -NFS4ERR_NOTSUPP:
6474 goto out;
6475 default:
6476 err = nfs4_handle_exception(server, err, &exception);
6477 }
6478 } while (exception.retry);
6479out:
6480 return err;
6481}
6482
6483static int
6484nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6485 struct nfs_fsinfo *info)
6486{
6487 int err;
6488 struct page *page;
6489 rpc_authflavor_t flavor;
6490 struct nfs4_secinfo_flavors *flavors;
6491
6492 page = alloc_page(GFP_KERNEL);
6493 if (!page) {
6494 err = -ENOMEM;
6495 goto out;
6496 }
6497
6498 flavors = page_address(page);
6499 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6500
6501 /*
6502 * Fall back on "guess and check" method if
6503 * the server doesn't support SECINFO_NO_NAME
6504 */
6505 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6506 err = nfs4_find_root_sec(server, fhandle, info);
6507 goto out_freepage;
6508 }
6509 if (err)
6510 goto out_freepage;
6511
6512 flavor = nfs_find_best_sec(flavors);
6513 if (err == 0)
6514 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6515
6516out_freepage:
6517 put_page(page);
6518 if (err == -EACCES)
6519 return -EPERM;
6520out:
6521 return err;
6522}
6523
6524static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6525{
6526 int status;
6527 struct nfs41_test_stateid_args args = {
6528 .stateid = stateid,
6529 };
6530 struct nfs41_test_stateid_res res;
6531 struct rpc_message msg = {
6532 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6533 .rpc_argp = &args,
6534 .rpc_resp = &res,
6535 };
6536
6537 dprintk("NFS call test_stateid %p\n", stateid);
6538 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6539 status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6540 if (status != NFS_OK) {
6541 dprintk("NFS reply test_stateid: failed, %d\n", status);
6542 return status;
6543 }
6544 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6545 return -res.status;
6546}
6547
6548/**
6549 * nfs41_test_stateid - perform a TEST_STATEID operation
6550 *
6551 * @server: server / transport on which to perform the operation
6552 * @stateid: state ID to test
6553 *
6554 * Returns NFS_OK if the server recognizes that "stateid" is valid.
6555 * Otherwise a negative NFS4ERR value is returned if the operation
6556 * failed or the state ID is not currently valid.
6557 */
6558static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6559{
6560 struct nfs4_exception exception = { };
6561 int err;
6562 do {
6563 err = _nfs41_test_stateid(server, stateid);
6564 if (err != -NFS4ERR_DELAY)
6565 break;
6566 nfs4_handle_exception(server, err, &exception);
6567 } while (exception.retry);
6568 return err;
6569}
6570
6571static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6572{
6573 struct nfs41_free_stateid_args args = {
6574 .stateid = stateid,
6575 };
6576 struct nfs41_free_stateid_res res;
6577 struct rpc_message msg = {
6578 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6579 .rpc_argp = &args,
6580 .rpc_resp = &res,
6581 };
6582 int status;
6583
6584 dprintk("NFS call free_stateid %p\n", stateid);
6585 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6586 status = nfs4_call_sync_sequence(server->client, server, &msg,
6587 &args.seq_args, &res.seq_res, 1);
6588 dprintk("NFS reply free_stateid: %d\n", status);
6589 return status;
6590}
6591
6592/**
6593 * nfs41_free_stateid - perform a FREE_STATEID operation
6594 *
6595 * @server: server / transport on which to perform the operation
6596 * @stateid: state ID to release
6597 *
6598 * Returns NFS_OK if the server freed "stateid". Otherwise a
6599 * negative NFS4ERR value is returned.
6600 */
6601static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6602{
6603 struct nfs4_exception exception = { };
6604 int err;
6605 do {
6606 err = _nfs4_free_stateid(server, stateid);
6607 if (err != -NFS4ERR_DELAY)
6608 break;
6609 nfs4_handle_exception(server, err, &exception);
6610 } while (exception.retry);
6611 return err;
6612}
6613
6614static bool nfs41_match_stateid(const nfs4_stateid *s1,
6615 const nfs4_stateid *s2)
6616{
6617 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6618 return false;
6619
6620 if (s1->seqid == s2->seqid)
6621 return true;
6622 if (s1->seqid == 0 || s2->seqid == 0)
6623 return true;
6624
6625 return false;
6626}
6627
6628#endif /* CONFIG_NFS_V4_1 */
6629
6630static bool nfs4_match_stateid(const nfs4_stateid *s1,
6631 const nfs4_stateid *s2)
6632{
6633 return nfs4_stateid_match(s1, s2);
6634}
6635
6636
6637static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6638 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6639 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6640 .recover_open = nfs4_open_reclaim,
6641 .recover_lock = nfs4_lock_reclaim,
6642 .establish_clid = nfs4_init_clientid,
6643 .get_clid_cred = nfs4_get_setclientid_cred,
6644 .detect_trunking = nfs40_discover_server_trunking,
6645};
6646
6647#if defined(CONFIG_NFS_V4_1)
6648static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6649 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6650 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6651 .recover_open = nfs4_open_reclaim,
6652 .recover_lock = nfs4_lock_reclaim,
6653 .establish_clid = nfs41_init_clientid,
6654 .get_clid_cred = nfs4_get_exchange_id_cred,
6655 .reclaim_complete = nfs41_proc_reclaim_complete,
6656 .detect_trunking = nfs41_discover_server_trunking,
6657};
6658#endif /* CONFIG_NFS_V4_1 */
6659
6660static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6661 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6662 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6663 .recover_open = nfs4_open_expired,
6664 .recover_lock = nfs4_lock_expired,
6665 .establish_clid = nfs4_init_clientid,
6666 .get_clid_cred = nfs4_get_setclientid_cred,
6667};
6668
6669#if defined(CONFIG_NFS_V4_1)
6670static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6671 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6672 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6673 .recover_open = nfs41_open_expired,
6674 .recover_lock = nfs41_lock_expired,
6675 .establish_clid = nfs41_init_clientid,
6676 .get_clid_cred = nfs4_get_exchange_id_cred,
6677};
6678#endif /* CONFIG_NFS_V4_1 */
6679
6680static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6681 .sched_state_renewal = nfs4_proc_async_renew,
6682 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6683 .renew_lease = nfs4_proc_renew,
6684};
6685
6686#if defined(CONFIG_NFS_V4_1)
6687static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6688 .sched_state_renewal = nfs41_proc_async_sequence,
6689 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6690 .renew_lease = nfs4_proc_sequence,
6691};
6692#endif
6693
6694static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6695 .minor_version = 0,
6696 .call_sync = _nfs4_call_sync,
6697 .match_stateid = nfs4_match_stateid,
6698 .find_root_sec = nfs4_find_root_sec,
6699 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6700 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6701 .state_renewal_ops = &nfs40_state_renewal_ops,
6702};
6703
6704#if defined(CONFIG_NFS_V4_1)
6705static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6706 .minor_version = 1,
6707 .call_sync = _nfs4_call_sync_session,
6708 .match_stateid = nfs41_match_stateid,
6709 .find_root_sec = nfs41_find_root_sec,
6710 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6711 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6712 .state_renewal_ops = &nfs41_state_renewal_ops,
6713};
6714#endif
6715
6716const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6717 [0] = &nfs_v4_0_minor_ops,
6718#if defined(CONFIG_NFS_V4_1)
6719 [1] = &nfs_v4_1_minor_ops,
6720#endif
6721};
6722
6723const struct inode_operations nfs4_dir_inode_operations = {
6724 .create = nfs_create,
6725 .lookup = nfs_lookup,
6726 .atomic_open = nfs_atomic_open,
6727 .link = nfs_link,
6728 .unlink = nfs_unlink,
6729 .symlink = nfs_symlink,
6730 .mkdir = nfs_mkdir,
6731 .rmdir = nfs_rmdir,
6732 .mknod = nfs_mknod,
6733 .rename = nfs_rename,
6734 .permission = nfs_permission,
6735 .getattr = nfs_getattr,
6736 .setattr = nfs_setattr,
6737 .getxattr = generic_getxattr,
6738 .setxattr = generic_setxattr,
6739 .listxattr = generic_listxattr,
6740 .removexattr = generic_removexattr,
6741};
6742
6743static const struct inode_operations nfs4_file_inode_operations = {
6744 .permission = nfs_permission,
6745 .getattr = nfs_getattr,
6746 .setattr = nfs_setattr,
6747 .getxattr = generic_getxattr,
6748 .setxattr = generic_setxattr,
6749 .listxattr = generic_listxattr,
6750 .removexattr = generic_removexattr,
6751};
6752
6753const struct nfs_rpc_ops nfs_v4_clientops = {
6754 .version = 4, /* protocol version */
6755 .dentry_ops = &nfs4_dentry_operations,
6756 .dir_inode_ops = &nfs4_dir_inode_operations,
6757 .file_inode_ops = &nfs4_file_inode_operations,
6758 .file_ops = &nfs4_file_operations,
6759 .getroot = nfs4_proc_get_root,
6760 .submount = nfs4_submount,
6761 .try_mount = nfs4_try_mount,
6762 .getattr = nfs4_proc_getattr,
6763 .setattr = nfs4_proc_setattr,
6764 .lookup = nfs4_proc_lookup,
6765 .access = nfs4_proc_access,
6766 .readlink = nfs4_proc_readlink,
6767 .create = nfs4_proc_create,
6768 .remove = nfs4_proc_remove,
6769 .unlink_setup = nfs4_proc_unlink_setup,
6770 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6771 .unlink_done = nfs4_proc_unlink_done,
6772 .rename = nfs4_proc_rename,
6773 .rename_setup = nfs4_proc_rename_setup,
6774 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6775 .rename_done = nfs4_proc_rename_done,
6776 .link = nfs4_proc_link,
6777 .symlink = nfs4_proc_symlink,
6778 .mkdir = nfs4_proc_mkdir,
6779 .rmdir = nfs4_proc_remove,
6780 .readdir = nfs4_proc_readdir,
6781 .mknod = nfs4_proc_mknod,
6782 .statfs = nfs4_proc_statfs,
6783 .fsinfo = nfs4_proc_fsinfo,
6784 .pathconf = nfs4_proc_pathconf,
6785 .set_capabilities = nfs4_server_capabilities,
6786 .decode_dirent = nfs4_decode_dirent,
6787 .read_setup = nfs4_proc_read_setup,
6788 .read_pageio_init = pnfs_pageio_init_read,
6789 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6790 .read_done = nfs4_read_done,
6791 .write_setup = nfs4_proc_write_setup,
6792 .write_pageio_init = pnfs_pageio_init_write,
6793 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6794 .write_done = nfs4_write_done,
6795 .commit_setup = nfs4_proc_commit_setup,
6796 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6797 .commit_done = nfs4_commit_done,
6798 .lock = nfs4_proc_lock,
6799 .clear_acl_cache = nfs4_zap_acl_attr,
6800 .close_context = nfs4_close_context,
6801 .open_context = nfs4_atomic_open,
6802 .have_delegation = nfs4_have_delegation,
6803 .return_delegation = nfs4_inode_return_delegation,
6804 .alloc_client = nfs4_alloc_client,
6805 .init_client = nfs4_init_client,
6806 .free_client = nfs4_free_client,
6807 .create_server = nfs4_create_server,
6808 .clone_server = nfs_clone_server,
6809};
6810
6811static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6812 .prefix = XATTR_NAME_NFSV4_ACL,
6813 .list = nfs4_xattr_list_nfs4_acl,
6814 .get = nfs4_xattr_get_nfs4_acl,
6815 .set = nfs4_xattr_set_nfs4_acl,
6816};
6817
6818const struct xattr_handler *nfs4_xattr_handlers[] = {
6819 &nfs4_xattr_nfs4_acl_handler,
6820 NULL
6821};
6822
6823/*
6824 * Local variables:
6825 * c-basic-offset: 8
6826 * End:
6827 */
Linux 6.x block layer and io_uring tree(s)