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