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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/sunrpc/gss_api.h>
47#include <linux/nfs.h>
48#include <linux/nfs4.h>
49#include <linux/nfs_fs.h>
50#include <linux/nfs_page.h>
51#include <linux/nfs_mount.h>
52#include <linux/namei.h>
53#include <linux/mount.h>
54#include <linux/module.h>
55#include <linux/nfs_idmap.h>
56#include <linux/sunrpc/bc_xprt.h>
57#include <linux/xattr.h>
58#include <linux/utsname.h>
59#include <linux/freezer.h>
60
61#include "nfs4_fs.h"
62#include "delegation.h"
63#include "internal.h"
64#include "iostat.h"
65#include "callback.h"
66#include "pnfs.h"
67#include "netns.h"
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
74#define NFS4_MAX_LOOP_ON_RECOVER (10)
75
76static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
77
78struct nfs4_opendata;
79static int _nfs4_proc_open(struct nfs4_opendata *data);
80static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
81static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
82static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
83static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
84static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
85static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
86static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
87 struct nfs_fattr *fattr, struct iattr *sattr,
88 struct nfs4_state *state);
89#ifdef CONFIG_NFS_V4_1
90static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
91static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
92#endif
93/* Prevent leaks of NFSv4 errors into userland */
94static int nfs4_map_errors(int err)
95{
96 if (err >= -1000)
97 return err;
98 switch (err) {
99 case -NFS4ERR_RESOURCE:
100 return -EREMOTEIO;
101 case -NFS4ERR_WRONGSEC:
102 return -EPERM;
103 case -NFS4ERR_BADOWNER:
104 case -NFS4ERR_BADNAME:
105 return -EINVAL;
106 case -NFS4ERR_SHARE_DENIED:
107 return -EACCES;
108 case -NFS4ERR_MINOR_VERS_MISMATCH:
109 return -EPROTONOSUPPORT;
110 default:
111 dprintk("%s could not handle NFSv4 error %d\n",
112 __func__, -err);
113 break;
114 }
115 return -EIO;
116}
117
118/*
119 * This is our standard bitmap for GETATTR requests.
120 */
121const u32 nfs4_fattr_bitmap[3] = {
122 FATTR4_WORD0_TYPE
123 | FATTR4_WORD0_CHANGE
124 | FATTR4_WORD0_SIZE
125 | FATTR4_WORD0_FSID
126 | FATTR4_WORD0_FILEID,
127 FATTR4_WORD1_MODE
128 | FATTR4_WORD1_NUMLINKS
129 | FATTR4_WORD1_OWNER
130 | FATTR4_WORD1_OWNER_GROUP
131 | FATTR4_WORD1_RAWDEV
132 | FATTR4_WORD1_SPACE_USED
133 | FATTR4_WORD1_TIME_ACCESS
134 | FATTR4_WORD1_TIME_METADATA
135 | FATTR4_WORD1_TIME_MODIFY
136};
137
138static const u32 nfs4_pnfs_open_bitmap[3] = {
139 FATTR4_WORD0_TYPE
140 | FATTR4_WORD0_CHANGE
141 | FATTR4_WORD0_SIZE
142 | FATTR4_WORD0_FSID
143 | FATTR4_WORD0_FILEID,
144 FATTR4_WORD1_MODE
145 | FATTR4_WORD1_NUMLINKS
146 | FATTR4_WORD1_OWNER
147 | FATTR4_WORD1_OWNER_GROUP
148 | FATTR4_WORD1_RAWDEV
149 | FATTR4_WORD1_SPACE_USED
150 | FATTR4_WORD1_TIME_ACCESS
151 | FATTR4_WORD1_TIME_METADATA
152 | FATTR4_WORD1_TIME_MODIFY,
153 FATTR4_WORD2_MDSTHRESHOLD
154};
155
156const u32 nfs4_statfs_bitmap[2] = {
157 FATTR4_WORD0_FILES_AVAIL
158 | FATTR4_WORD0_FILES_FREE
159 | FATTR4_WORD0_FILES_TOTAL,
160 FATTR4_WORD1_SPACE_AVAIL
161 | FATTR4_WORD1_SPACE_FREE
162 | FATTR4_WORD1_SPACE_TOTAL
163};
164
165const u32 nfs4_pathconf_bitmap[2] = {
166 FATTR4_WORD0_MAXLINK
167 | FATTR4_WORD0_MAXNAME,
168 0
169};
170
171const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
172 | FATTR4_WORD0_MAXREAD
173 | FATTR4_WORD0_MAXWRITE
174 | FATTR4_WORD0_LEASE_TIME,
175 FATTR4_WORD1_TIME_DELTA
176 | FATTR4_WORD1_FS_LAYOUT_TYPES,
177 FATTR4_WORD2_LAYOUT_BLKSIZE
178};
179
180const u32 nfs4_fs_locations_bitmap[2] = {
181 FATTR4_WORD0_TYPE
182 | FATTR4_WORD0_CHANGE
183 | FATTR4_WORD0_SIZE
184 | FATTR4_WORD0_FSID
185 | FATTR4_WORD0_FILEID
186 | FATTR4_WORD0_FS_LOCATIONS,
187 FATTR4_WORD1_MODE
188 | FATTR4_WORD1_NUMLINKS
189 | FATTR4_WORD1_OWNER
190 | FATTR4_WORD1_OWNER_GROUP
191 | FATTR4_WORD1_RAWDEV
192 | FATTR4_WORD1_SPACE_USED
193 | FATTR4_WORD1_TIME_ACCESS
194 | FATTR4_WORD1_TIME_METADATA
195 | FATTR4_WORD1_TIME_MODIFY
196 | FATTR4_WORD1_MOUNTED_ON_FILEID
197};
198
199static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
200 struct nfs4_readdir_arg *readdir)
201{
202 __be32 *start, *p;
203
204 BUG_ON(readdir->count < 80);
205 if (cookie > 2) {
206 readdir->cookie = cookie;
207 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
208 return;
209 }
210
211 readdir->cookie = 0;
212 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
213 if (cookie == 2)
214 return;
215
216 /*
217 * NFSv4 servers do not return entries for '.' and '..'
218 * Therefore, we fake these entries here. We let '.'
219 * have cookie 0 and '..' have cookie 1. Note that
220 * when talking to the server, we always send cookie 0
221 * instead of 1 or 2.
222 */
223 start = p = kmap_atomic(*readdir->pages);
224
225 if (cookie == 0) {
226 *p++ = xdr_one; /* next */
227 *p++ = xdr_zero; /* cookie, first word */
228 *p++ = xdr_one; /* cookie, second word */
229 *p++ = xdr_one; /* entry len */
230 memcpy(p, ".\0\0\0", 4); /* entry */
231 p++;
232 *p++ = xdr_one; /* bitmap length */
233 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
234 *p++ = htonl(8); /* attribute buffer length */
235 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
236 }
237
238 *p++ = xdr_one; /* next */
239 *p++ = xdr_zero; /* cookie, first word */
240 *p++ = xdr_two; /* cookie, second word */
241 *p++ = xdr_two; /* entry len */
242 memcpy(p, "..\0\0", 4); /* entry */
243 p++;
244 *p++ = xdr_one; /* bitmap length */
245 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
246 *p++ = htonl(8); /* attribute buffer length */
247 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
248
249 readdir->pgbase = (char *)p - (char *)start;
250 readdir->count -= readdir->pgbase;
251 kunmap_atomic(start);
252}
253
254static int nfs4_wait_clnt_recover(struct nfs_client *clp)
255{
256 int res;
257
258 might_sleep();
259
260 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
261 nfs_wait_bit_killable, TASK_KILLABLE);
262 return res;
263}
264
265static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
266{
267 int res = 0;
268
269 might_sleep();
270
271 if (*timeout <= 0)
272 *timeout = NFS4_POLL_RETRY_MIN;
273 if (*timeout > NFS4_POLL_RETRY_MAX)
274 *timeout = NFS4_POLL_RETRY_MAX;
275 freezable_schedule_timeout_killable(*timeout);
276 if (fatal_signal_pending(current))
277 res = -ERESTARTSYS;
278 *timeout <<= 1;
279 return res;
280}
281
282/* This is the error handling routine for processes that are allowed
283 * to sleep.
284 */
285static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
286{
287 struct nfs_client *clp = server->nfs_client;
288 struct nfs4_state *state = exception->state;
289 struct inode *inode = exception->inode;
290 int ret = errorcode;
291
292 exception->retry = 0;
293 switch(errorcode) {
294 case 0:
295 return 0;
296 case -NFS4ERR_OPENMODE:
297 if (inode && nfs_have_delegation(inode, FMODE_READ)) {
298 nfs_inode_return_delegation(inode);
299 exception->retry = 1;
300 return 0;
301 }
302 if (state == NULL)
303 break;
304 nfs4_schedule_stateid_recovery(server, state);
305 goto wait_on_recovery;
306 case -NFS4ERR_DELEG_REVOKED:
307 case -NFS4ERR_ADMIN_REVOKED:
308 case -NFS4ERR_BAD_STATEID:
309 if (state == NULL)
310 break;
311 nfs_remove_bad_delegation(state->inode);
312 nfs4_schedule_stateid_recovery(server, state);
313 goto wait_on_recovery;
314 case -NFS4ERR_EXPIRED:
315 if (state != NULL)
316 nfs4_schedule_stateid_recovery(server, state);
317 case -NFS4ERR_STALE_STATEID:
318 case -NFS4ERR_STALE_CLIENTID:
319 nfs4_schedule_lease_recovery(clp);
320 goto wait_on_recovery;
321#if defined(CONFIG_NFS_V4_1)
322 case -NFS4ERR_BADSESSION:
323 case -NFS4ERR_BADSLOT:
324 case -NFS4ERR_BAD_HIGH_SLOT:
325 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
326 case -NFS4ERR_DEADSESSION:
327 case -NFS4ERR_SEQ_FALSE_RETRY:
328 case -NFS4ERR_SEQ_MISORDERED:
329 dprintk("%s ERROR: %d Reset session\n", __func__,
330 errorcode);
331 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
332 exception->retry = 1;
333 break;
334#endif /* defined(CONFIG_NFS_V4_1) */
335 case -NFS4ERR_FILE_OPEN:
336 if (exception->timeout > HZ) {
337 /* We have retried a decent amount, time to
338 * fail
339 */
340 ret = -EBUSY;
341 break;
342 }
343 case -NFS4ERR_GRACE:
344 case -NFS4ERR_DELAY:
345 case -EKEYEXPIRED:
346 ret = nfs4_delay(server->client, &exception->timeout);
347 if (ret != 0)
348 break;
349 case -NFS4ERR_RETRY_UNCACHED_REP:
350 case -NFS4ERR_OLD_STATEID:
351 exception->retry = 1;
352 break;
353 case -NFS4ERR_BADOWNER:
354 /* The following works around a Linux server bug! */
355 case -NFS4ERR_BADNAME:
356 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
357 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
358 exception->retry = 1;
359 printk(KERN_WARNING "NFS: v4 server %s "
360 "does not accept raw "
361 "uid/gids. "
362 "Reenabling the idmapper.\n",
363 server->nfs_client->cl_hostname);
364 }
365 }
366 /* We failed to handle the error */
367 return nfs4_map_errors(ret);
368wait_on_recovery:
369 ret = nfs4_wait_clnt_recover(clp);
370 if (ret == 0)
371 exception->retry = 1;
372 return ret;
373}
374
375
376static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
377{
378 spin_lock(&clp->cl_lock);
379 if (time_before(clp->cl_last_renewal,timestamp))
380 clp->cl_last_renewal = timestamp;
381 spin_unlock(&clp->cl_lock);
382}
383
384static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
385{
386 do_renew_lease(server->nfs_client, timestamp);
387}
388
389#if defined(CONFIG_NFS_V4_1)
390
391/*
392 * nfs4_free_slot - free a slot and efficiently update slot table.
393 *
394 * freeing a slot is trivially done by clearing its respective bit
395 * in the bitmap.
396 * If the freed slotid equals highest_used_slotid we want to update it
397 * so that the server would be able to size down the slot table if needed,
398 * otherwise we know that the highest_used_slotid is still in use.
399 * When updating highest_used_slotid there may be "holes" in the bitmap
400 * so we need to scan down from highest_used_slotid to 0 looking for the now
401 * highest slotid in use.
402 * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
403 *
404 * Must be called while holding tbl->slot_tbl_lock
405 */
406static void
407nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
408{
409 BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
410 /* clear used bit in bitmap */
411 __clear_bit(slotid, tbl->used_slots);
412
413 /* update highest_used_slotid when it is freed */
414 if (slotid == tbl->highest_used_slotid) {
415 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
416 if (slotid < tbl->max_slots)
417 tbl->highest_used_slotid = slotid;
418 else
419 tbl->highest_used_slotid = NFS4_NO_SLOT;
420 }
421 dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
422 slotid, tbl->highest_used_slotid);
423}
424
425bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
426{
427 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
428 return true;
429}
430
431/*
432 * Signal state manager thread if session fore channel is drained
433 */
434static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
435{
436 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
437 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
438 nfs4_set_task_privileged, NULL);
439 return;
440 }
441
442 if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
443 return;
444
445 dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
446 complete(&ses->fc_slot_table.complete);
447}
448
449/*
450 * Signal state manager thread if session back channel is drained
451 */
452void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
453{
454 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
455 ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
456 return;
457 dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
458 complete(&ses->bc_slot_table.complete);
459}
460
461static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
462{
463 struct nfs4_slot_table *tbl;
464
465 tbl = &res->sr_session->fc_slot_table;
466 if (!res->sr_slot) {
467 /* just wake up the next guy waiting since
468 * we may have not consumed a slot after all */
469 dprintk("%s: No slot\n", __func__);
470 return;
471 }
472
473 spin_lock(&tbl->slot_tbl_lock);
474 nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
475 nfs4_check_drain_fc_complete(res->sr_session);
476 spin_unlock(&tbl->slot_tbl_lock);
477 res->sr_slot = NULL;
478}
479
480static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
481{
482 unsigned long timestamp;
483 struct nfs_client *clp;
484
485 /*
486 * sr_status remains 1 if an RPC level error occurred. The server
487 * may or may not have processed the sequence operation..
488 * Proceed as if the server received and processed the sequence
489 * operation.
490 */
491 if (res->sr_status == 1)
492 res->sr_status = NFS_OK;
493
494 /* don't increment the sequence number if the task wasn't sent */
495 if (!RPC_WAS_SENT(task))
496 goto out;
497
498 /* Check the SEQUENCE operation status */
499 switch (res->sr_status) {
500 case 0:
501 /* Update the slot's sequence and clientid lease timer */
502 ++res->sr_slot->seq_nr;
503 timestamp = res->sr_renewal_time;
504 clp = res->sr_session->clp;
505 do_renew_lease(clp, timestamp);
506 /* Check sequence flags */
507 if (res->sr_status_flags != 0)
508 nfs4_schedule_lease_recovery(clp);
509 break;
510 case -NFS4ERR_DELAY:
511 /* The server detected a resend of the RPC call and
512 * returned NFS4ERR_DELAY as per Section 2.10.6.2
513 * of RFC5661.
514 */
515 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
516 __func__,
517 res->sr_slot - res->sr_session->fc_slot_table.slots,
518 res->sr_slot->seq_nr);
519 goto out_retry;
520 default:
521 /* Just update the slot sequence no. */
522 ++res->sr_slot->seq_nr;
523 }
524out:
525 /* The session may be reset by one of the error handlers. */
526 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
527 nfs41_sequence_free_slot(res);
528 return 1;
529out_retry:
530 if (!rpc_restart_call(task))
531 goto out;
532 rpc_delay(task, NFS4_POLL_RETRY_MAX);
533 return 0;
534}
535
536static int nfs4_sequence_done(struct rpc_task *task,
537 struct nfs4_sequence_res *res)
538{
539 if (res->sr_session == NULL)
540 return 1;
541 return nfs41_sequence_done(task, res);
542}
543
544/*
545 * nfs4_find_slot - efficiently look for a free slot
546 *
547 * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
548 * If found, we mark the slot as used, update the highest_used_slotid,
549 * and respectively set up the sequence operation args.
550 * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
551 *
552 * Note: must be called with under the slot_tbl_lock.
553 */
554static u32
555nfs4_find_slot(struct nfs4_slot_table *tbl)
556{
557 u32 slotid;
558 u32 ret_id = NFS4_NO_SLOT;
559
560 dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
561 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
562 tbl->max_slots);
563 slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
564 if (slotid >= tbl->max_slots)
565 goto out;
566 __set_bit(slotid, tbl->used_slots);
567 if (slotid > tbl->highest_used_slotid ||
568 tbl->highest_used_slotid == NFS4_NO_SLOT)
569 tbl->highest_used_slotid = slotid;
570 ret_id = slotid;
571out:
572 dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
573 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
574 return ret_id;
575}
576
577static void nfs41_init_sequence(struct nfs4_sequence_args *args,
578 struct nfs4_sequence_res *res, int cache_reply)
579{
580 args->sa_session = NULL;
581 args->sa_cache_this = 0;
582 if (cache_reply)
583 args->sa_cache_this = 1;
584 res->sr_session = NULL;
585 res->sr_slot = NULL;
586}
587
588int nfs41_setup_sequence(struct nfs4_session *session,
589 struct nfs4_sequence_args *args,
590 struct nfs4_sequence_res *res,
591 struct rpc_task *task)
592{
593 struct nfs4_slot *slot;
594 struct nfs4_slot_table *tbl;
595 u32 slotid;
596
597 dprintk("--> %s\n", __func__);
598 /* slot already allocated? */
599 if (res->sr_slot != NULL)
600 return 0;
601
602 tbl = &session->fc_slot_table;
603
604 spin_lock(&tbl->slot_tbl_lock);
605 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
606 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
607 /* The state manager will wait until the slot table is empty */
608 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
609 spin_unlock(&tbl->slot_tbl_lock);
610 dprintk("%s session is draining\n", __func__);
611 return -EAGAIN;
612 }
613
614 if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
615 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
616 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
617 spin_unlock(&tbl->slot_tbl_lock);
618 dprintk("%s enforce FIFO order\n", __func__);
619 return -EAGAIN;
620 }
621
622 slotid = nfs4_find_slot(tbl);
623 if (slotid == NFS4_NO_SLOT) {
624 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
625 spin_unlock(&tbl->slot_tbl_lock);
626 dprintk("<-- %s: no free slots\n", __func__);
627 return -EAGAIN;
628 }
629 spin_unlock(&tbl->slot_tbl_lock);
630
631 rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
632 slot = tbl->slots + slotid;
633 args->sa_session = session;
634 args->sa_slotid = slotid;
635
636 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
637
638 res->sr_session = session;
639 res->sr_slot = slot;
640 res->sr_renewal_time = jiffies;
641 res->sr_status_flags = 0;
642 /*
643 * sr_status is only set in decode_sequence, and so will remain
644 * set to 1 if an rpc level failure occurs.
645 */
646 res->sr_status = 1;
647 return 0;
648}
649EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
650
651int nfs4_setup_sequence(const struct nfs_server *server,
652 struct nfs4_sequence_args *args,
653 struct nfs4_sequence_res *res,
654 struct rpc_task *task)
655{
656 struct nfs4_session *session = nfs4_get_session(server);
657 int ret = 0;
658
659 if (session == NULL)
660 goto out;
661
662 dprintk("--> %s clp %p session %p sr_slot %td\n",
663 __func__, session->clp, session, res->sr_slot ?
664 res->sr_slot - session->fc_slot_table.slots : -1);
665
666 ret = nfs41_setup_sequence(session, args, res, task);
667out:
668 dprintk("<-- %s status=%d\n", __func__, ret);
669 return ret;
670}
671
672struct nfs41_call_sync_data {
673 const struct nfs_server *seq_server;
674 struct nfs4_sequence_args *seq_args;
675 struct nfs4_sequence_res *seq_res;
676};
677
678static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
679{
680 struct nfs41_call_sync_data *data = calldata;
681
682 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
683
684 if (nfs4_setup_sequence(data->seq_server, data->seq_args,
685 data->seq_res, task))
686 return;
687 rpc_call_start(task);
688}
689
690static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
691{
692 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
693 nfs41_call_sync_prepare(task, calldata);
694}
695
696static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
697{
698 struct nfs41_call_sync_data *data = calldata;
699
700 nfs41_sequence_done(task, data->seq_res);
701}
702
703static const struct rpc_call_ops nfs41_call_sync_ops = {
704 .rpc_call_prepare = nfs41_call_sync_prepare,
705 .rpc_call_done = nfs41_call_sync_done,
706};
707
708static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
709 .rpc_call_prepare = nfs41_call_priv_sync_prepare,
710 .rpc_call_done = nfs41_call_sync_done,
711};
712
713static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
714 struct nfs_server *server,
715 struct rpc_message *msg,
716 struct nfs4_sequence_args *args,
717 struct nfs4_sequence_res *res,
718 int privileged)
719{
720 int ret;
721 struct rpc_task *task;
722 struct nfs41_call_sync_data data = {
723 .seq_server = server,
724 .seq_args = args,
725 .seq_res = res,
726 };
727 struct rpc_task_setup task_setup = {
728 .rpc_client = clnt,
729 .rpc_message = msg,
730 .callback_ops = &nfs41_call_sync_ops,
731 .callback_data = &data
732 };
733
734 if (privileged)
735 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
736 task = rpc_run_task(&task_setup);
737 if (IS_ERR(task))
738 ret = PTR_ERR(task);
739 else {
740 ret = task->tk_status;
741 rpc_put_task(task);
742 }
743 return ret;
744}
745
746int _nfs4_call_sync_session(struct rpc_clnt *clnt,
747 struct nfs_server *server,
748 struct rpc_message *msg,
749 struct nfs4_sequence_args *args,
750 struct nfs4_sequence_res *res,
751 int cache_reply)
752{
753 nfs41_init_sequence(args, res, cache_reply);
754 return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
755}
756
757#else
758static inline
759void nfs41_init_sequence(struct nfs4_sequence_args *args,
760 struct nfs4_sequence_res *res, int cache_reply)
761{
762}
763
764static int nfs4_sequence_done(struct rpc_task *task,
765 struct nfs4_sequence_res *res)
766{
767 return 1;
768}
769#endif /* CONFIG_NFS_V4_1 */
770
771int _nfs4_call_sync(struct rpc_clnt *clnt,
772 struct nfs_server *server,
773 struct rpc_message *msg,
774 struct nfs4_sequence_args *args,
775 struct nfs4_sequence_res *res,
776 int cache_reply)
777{
778 nfs41_init_sequence(args, res, cache_reply);
779 return rpc_call_sync(clnt, msg, 0);
780}
781
782static inline
783int nfs4_call_sync(struct rpc_clnt *clnt,
784 struct nfs_server *server,
785 struct rpc_message *msg,
786 struct nfs4_sequence_args *args,
787 struct nfs4_sequence_res *res,
788 int cache_reply)
789{
790 return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
791 args, res, cache_reply);
792}
793
794static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
795{
796 struct nfs_inode *nfsi = NFS_I(dir);
797
798 spin_lock(&dir->i_lock);
799 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
800 if (!cinfo->atomic || cinfo->before != dir->i_version)
801 nfs_force_lookup_revalidate(dir);
802 dir->i_version = cinfo->after;
803 spin_unlock(&dir->i_lock);
804}
805
806struct nfs4_opendata {
807 struct kref kref;
808 struct nfs_openargs o_arg;
809 struct nfs_openres o_res;
810 struct nfs_open_confirmargs c_arg;
811 struct nfs_open_confirmres c_res;
812 struct nfs4_string owner_name;
813 struct nfs4_string group_name;
814 struct nfs_fattr f_attr;
815 struct dentry *dir;
816 struct dentry *dentry;
817 struct nfs4_state_owner *owner;
818 struct nfs4_state *state;
819 struct iattr attrs;
820 unsigned long timestamp;
821 unsigned int rpc_done : 1;
822 int rpc_status;
823 int cancelled;
824};
825
826
827static void nfs4_init_opendata_res(struct nfs4_opendata *p)
828{
829 p->o_res.f_attr = &p->f_attr;
830 p->o_res.seqid = p->o_arg.seqid;
831 p->c_res.seqid = p->c_arg.seqid;
832 p->o_res.server = p->o_arg.server;
833 nfs_fattr_init(&p->f_attr);
834 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
835}
836
837static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
838 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
839 const struct iattr *attrs,
840 gfp_t gfp_mask)
841{
842 struct dentry *parent = dget_parent(dentry);
843 struct inode *dir = parent->d_inode;
844 struct nfs_server *server = NFS_SERVER(dir);
845 struct nfs4_opendata *p;
846
847 p = kzalloc(sizeof(*p), gfp_mask);
848 if (p == NULL)
849 goto err;
850 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
851 if (p->o_arg.seqid == NULL)
852 goto err_free;
853 nfs_sb_active(dentry->d_sb);
854 p->dentry = dget(dentry);
855 p->dir = parent;
856 p->owner = sp;
857 atomic_inc(&sp->so_count);
858 p->o_arg.fh = NFS_FH(dir);
859 p->o_arg.open_flags = flags;
860 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
861 p->o_arg.clientid = server->nfs_client->cl_clientid;
862 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
863 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
864 p->o_arg.name = &dentry->d_name;
865 p->o_arg.server = server;
866 p->o_arg.bitmask = server->attr_bitmask;
867 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
868 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
869 if (attrs != NULL && attrs->ia_valid != 0) {
870 __be32 verf[2];
871
872 p->o_arg.u.attrs = &p->attrs;
873 memcpy(&p->attrs, attrs, sizeof(p->attrs));
874
875 verf[0] = jiffies;
876 verf[1] = current->pid;
877 memcpy(p->o_arg.u.verifier.data, verf,
878 sizeof(p->o_arg.u.verifier.data));
879 }
880 p->c_arg.fh = &p->o_res.fh;
881 p->c_arg.stateid = &p->o_res.stateid;
882 p->c_arg.seqid = p->o_arg.seqid;
883 nfs4_init_opendata_res(p);
884 kref_init(&p->kref);
885 return p;
886err_free:
887 kfree(p);
888err:
889 dput(parent);
890 return NULL;
891}
892
893static void nfs4_opendata_free(struct kref *kref)
894{
895 struct nfs4_opendata *p = container_of(kref,
896 struct nfs4_opendata, kref);
897 struct super_block *sb = p->dentry->d_sb;
898
899 nfs_free_seqid(p->o_arg.seqid);
900 if (p->state != NULL)
901 nfs4_put_open_state(p->state);
902 nfs4_put_state_owner(p->owner);
903 dput(p->dir);
904 dput(p->dentry);
905 nfs_sb_deactive(sb);
906 nfs_fattr_free_names(&p->f_attr);
907 kfree(p);
908}
909
910static void nfs4_opendata_put(struct nfs4_opendata *p)
911{
912 if (p != NULL)
913 kref_put(&p->kref, nfs4_opendata_free);
914}
915
916static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
917{
918 int ret;
919
920 ret = rpc_wait_for_completion_task(task);
921 return ret;
922}
923
924static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
925{
926 int ret = 0;
927
928 if (open_mode & (O_EXCL|O_TRUNC))
929 goto out;
930 switch (mode & (FMODE_READ|FMODE_WRITE)) {
931 case FMODE_READ:
932 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
933 && state->n_rdonly != 0;
934 break;
935 case FMODE_WRITE:
936 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
937 && state->n_wronly != 0;
938 break;
939 case FMODE_READ|FMODE_WRITE:
940 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
941 && state->n_rdwr != 0;
942 }
943out:
944 return ret;
945}
946
947static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
948{
949 if (delegation == NULL)
950 return 0;
951 if ((delegation->type & fmode) != fmode)
952 return 0;
953 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
954 return 0;
955 nfs_mark_delegation_referenced(delegation);
956 return 1;
957}
958
959static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
960{
961 switch (fmode) {
962 case FMODE_WRITE:
963 state->n_wronly++;
964 break;
965 case FMODE_READ:
966 state->n_rdonly++;
967 break;
968 case FMODE_READ|FMODE_WRITE:
969 state->n_rdwr++;
970 }
971 nfs4_state_set_mode_locked(state, state->state | fmode);
972}
973
974static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
975{
976 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
977 nfs4_stateid_copy(&state->stateid, stateid);
978 nfs4_stateid_copy(&state->open_stateid, stateid);
979 switch (fmode) {
980 case FMODE_READ:
981 set_bit(NFS_O_RDONLY_STATE, &state->flags);
982 break;
983 case FMODE_WRITE:
984 set_bit(NFS_O_WRONLY_STATE, &state->flags);
985 break;
986 case FMODE_READ|FMODE_WRITE:
987 set_bit(NFS_O_RDWR_STATE, &state->flags);
988 }
989}
990
991static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
992{
993 write_seqlock(&state->seqlock);
994 nfs_set_open_stateid_locked(state, stateid, fmode);
995 write_sequnlock(&state->seqlock);
996}
997
998static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
999{
1000 /*
1001 * Protect the call to nfs4_state_set_mode_locked and
1002 * serialise the stateid update
1003 */
1004 write_seqlock(&state->seqlock);
1005 if (deleg_stateid != NULL) {
1006 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1007 set_bit(NFS_DELEGATED_STATE, &state->flags);
1008 }
1009 if (open_stateid != NULL)
1010 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1011 write_sequnlock(&state->seqlock);
1012 spin_lock(&state->owner->so_lock);
1013 update_open_stateflags(state, fmode);
1014 spin_unlock(&state->owner->so_lock);
1015}
1016
1017static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1018{
1019 struct nfs_inode *nfsi = NFS_I(state->inode);
1020 struct nfs_delegation *deleg_cur;
1021 int ret = 0;
1022
1023 fmode &= (FMODE_READ|FMODE_WRITE);
1024
1025 rcu_read_lock();
1026 deleg_cur = rcu_dereference(nfsi->delegation);
1027 if (deleg_cur == NULL)
1028 goto no_delegation;
1029
1030 spin_lock(&deleg_cur->lock);
1031 if (nfsi->delegation != deleg_cur ||
1032 (deleg_cur->type & fmode) != fmode)
1033 goto no_delegation_unlock;
1034
1035 if (delegation == NULL)
1036 delegation = &deleg_cur->stateid;
1037 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1038 goto no_delegation_unlock;
1039
1040 nfs_mark_delegation_referenced(deleg_cur);
1041 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1042 ret = 1;
1043no_delegation_unlock:
1044 spin_unlock(&deleg_cur->lock);
1045no_delegation:
1046 rcu_read_unlock();
1047
1048 if (!ret && open_stateid != NULL) {
1049 __update_open_stateid(state, open_stateid, NULL, fmode);
1050 ret = 1;
1051 }
1052
1053 return ret;
1054}
1055
1056
1057static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1058{
1059 struct nfs_delegation *delegation;
1060
1061 rcu_read_lock();
1062 delegation = rcu_dereference(NFS_I(inode)->delegation);
1063 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1064 rcu_read_unlock();
1065 return;
1066 }
1067 rcu_read_unlock();
1068 nfs_inode_return_delegation(inode);
1069}
1070
1071static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1072{
1073 struct nfs4_state *state = opendata->state;
1074 struct nfs_inode *nfsi = NFS_I(state->inode);
1075 struct nfs_delegation *delegation;
1076 int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1077 fmode_t fmode = opendata->o_arg.fmode;
1078 nfs4_stateid stateid;
1079 int ret = -EAGAIN;
1080
1081 for (;;) {
1082 if (can_open_cached(state, fmode, open_mode)) {
1083 spin_lock(&state->owner->so_lock);
1084 if (can_open_cached(state, fmode, open_mode)) {
1085 update_open_stateflags(state, fmode);
1086 spin_unlock(&state->owner->so_lock);
1087 goto out_return_state;
1088 }
1089 spin_unlock(&state->owner->so_lock);
1090 }
1091 rcu_read_lock();
1092 delegation = rcu_dereference(nfsi->delegation);
1093 if (!can_open_delegated(delegation, fmode)) {
1094 rcu_read_unlock();
1095 break;
1096 }
1097 /* Save the delegation */
1098 nfs4_stateid_copy(&stateid, &delegation->stateid);
1099 rcu_read_unlock();
1100 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1101 if (ret != 0)
1102 goto out;
1103 ret = -EAGAIN;
1104
1105 /* Try to update the stateid using the delegation */
1106 if (update_open_stateid(state, NULL, &stateid, fmode))
1107 goto out_return_state;
1108 }
1109out:
1110 return ERR_PTR(ret);
1111out_return_state:
1112 atomic_inc(&state->count);
1113 return state;
1114}
1115
1116static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1117{
1118 struct inode *inode;
1119 struct nfs4_state *state = NULL;
1120 struct nfs_delegation *delegation;
1121 int ret;
1122
1123 if (!data->rpc_done) {
1124 state = nfs4_try_open_cached(data);
1125 goto out;
1126 }
1127
1128 ret = -EAGAIN;
1129 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1130 goto err;
1131 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1132 ret = PTR_ERR(inode);
1133 if (IS_ERR(inode))
1134 goto err;
1135 ret = -ENOMEM;
1136 state = nfs4_get_open_state(inode, data->owner);
1137 if (state == NULL)
1138 goto err_put_inode;
1139 if (data->o_res.delegation_type != 0) {
1140 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1141 int delegation_flags = 0;
1142
1143 rcu_read_lock();
1144 delegation = rcu_dereference(NFS_I(inode)->delegation);
1145 if (delegation)
1146 delegation_flags = delegation->flags;
1147 rcu_read_unlock();
1148 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1149 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1150 "returning a delegation for "
1151 "OPEN(CLAIM_DELEGATE_CUR)\n",
1152 clp->cl_hostname);
1153 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1154 nfs_inode_set_delegation(state->inode,
1155 data->owner->so_cred,
1156 &data->o_res);
1157 else
1158 nfs_inode_reclaim_delegation(state->inode,
1159 data->owner->so_cred,
1160 &data->o_res);
1161 }
1162
1163 update_open_stateid(state, &data->o_res.stateid, NULL,
1164 data->o_arg.fmode);
1165 iput(inode);
1166out:
1167 return state;
1168err_put_inode:
1169 iput(inode);
1170err:
1171 return ERR_PTR(ret);
1172}
1173
1174static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1175{
1176 struct nfs_inode *nfsi = NFS_I(state->inode);
1177 struct nfs_open_context *ctx;
1178
1179 spin_lock(&state->inode->i_lock);
1180 list_for_each_entry(ctx, &nfsi->open_files, list) {
1181 if (ctx->state != state)
1182 continue;
1183 get_nfs_open_context(ctx);
1184 spin_unlock(&state->inode->i_lock);
1185 return ctx;
1186 }
1187 spin_unlock(&state->inode->i_lock);
1188 return ERR_PTR(-ENOENT);
1189}
1190
1191static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1192{
1193 struct nfs4_opendata *opendata;
1194
1195 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1196 if (opendata == NULL)
1197 return ERR_PTR(-ENOMEM);
1198 opendata->state = state;
1199 atomic_inc(&state->count);
1200 return opendata;
1201}
1202
1203static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1204{
1205 struct nfs4_state *newstate;
1206 int ret;
1207
1208 opendata->o_arg.open_flags = 0;
1209 opendata->o_arg.fmode = fmode;
1210 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1211 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1212 nfs4_init_opendata_res(opendata);
1213 ret = _nfs4_recover_proc_open(opendata);
1214 if (ret != 0)
1215 return ret;
1216 newstate = nfs4_opendata_to_nfs4_state(opendata);
1217 if (IS_ERR(newstate))
1218 return PTR_ERR(newstate);
1219 nfs4_close_state(newstate, fmode);
1220 *res = newstate;
1221 return 0;
1222}
1223
1224static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1225{
1226 struct nfs4_state *newstate;
1227 int ret;
1228
1229 /* memory barrier prior to reading state->n_* */
1230 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1231 smp_rmb();
1232 if (state->n_rdwr != 0) {
1233 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1234 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1235 if (ret != 0)
1236 return ret;
1237 if (newstate != state)
1238 return -ESTALE;
1239 }
1240 if (state->n_wronly != 0) {
1241 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1242 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1243 if (ret != 0)
1244 return ret;
1245 if (newstate != state)
1246 return -ESTALE;
1247 }
1248 if (state->n_rdonly != 0) {
1249 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1250 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1251 if (ret != 0)
1252 return ret;
1253 if (newstate != state)
1254 return -ESTALE;
1255 }
1256 /*
1257 * We may have performed cached opens for all three recoveries.
1258 * Check if we need to update the current stateid.
1259 */
1260 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1261 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1262 write_seqlock(&state->seqlock);
1263 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1264 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1265 write_sequnlock(&state->seqlock);
1266 }
1267 return 0;
1268}
1269
1270/*
1271 * OPEN_RECLAIM:
1272 * reclaim state on the server after a reboot.
1273 */
1274static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1275{
1276 struct nfs_delegation *delegation;
1277 struct nfs4_opendata *opendata;
1278 fmode_t delegation_type = 0;
1279 int status;
1280
1281 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1282 if (IS_ERR(opendata))
1283 return PTR_ERR(opendata);
1284 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1285 opendata->o_arg.fh = NFS_FH(state->inode);
1286 rcu_read_lock();
1287 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1288 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1289 delegation_type = delegation->type;
1290 rcu_read_unlock();
1291 opendata->o_arg.u.delegation_type = delegation_type;
1292 status = nfs4_open_recover(opendata, state);
1293 nfs4_opendata_put(opendata);
1294 return status;
1295}
1296
1297static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1298{
1299 struct nfs_server *server = NFS_SERVER(state->inode);
1300 struct nfs4_exception exception = { };
1301 int err;
1302 do {
1303 err = _nfs4_do_open_reclaim(ctx, state);
1304 if (err != -NFS4ERR_DELAY)
1305 break;
1306 nfs4_handle_exception(server, err, &exception);
1307 } while (exception.retry);
1308 return err;
1309}
1310
1311static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1312{
1313 struct nfs_open_context *ctx;
1314 int ret;
1315
1316 ctx = nfs4_state_find_open_context(state);
1317 if (IS_ERR(ctx))
1318 return PTR_ERR(ctx);
1319 ret = nfs4_do_open_reclaim(ctx, state);
1320 put_nfs_open_context(ctx);
1321 return ret;
1322}
1323
1324static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1325{
1326 struct nfs4_opendata *opendata;
1327 int ret;
1328
1329 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1330 if (IS_ERR(opendata))
1331 return PTR_ERR(opendata);
1332 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1333 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1334 ret = nfs4_open_recover(opendata, state);
1335 nfs4_opendata_put(opendata);
1336 return ret;
1337}
1338
1339int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1340{
1341 struct nfs4_exception exception = { };
1342 struct nfs_server *server = NFS_SERVER(state->inode);
1343 int err;
1344 do {
1345 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1346 switch (err) {
1347 case 0:
1348 case -ENOENT:
1349 case -ESTALE:
1350 goto out;
1351 case -NFS4ERR_BADSESSION:
1352 case -NFS4ERR_BADSLOT:
1353 case -NFS4ERR_BAD_HIGH_SLOT:
1354 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1355 case -NFS4ERR_DEADSESSION:
1356 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1357 goto out;
1358 case -NFS4ERR_STALE_CLIENTID:
1359 case -NFS4ERR_STALE_STATEID:
1360 case -NFS4ERR_EXPIRED:
1361 /* Don't recall a delegation if it was lost */
1362 nfs4_schedule_lease_recovery(server->nfs_client);
1363 goto out;
1364 case -ERESTARTSYS:
1365 /*
1366 * The show must go on: exit, but mark the
1367 * stateid as needing recovery.
1368 */
1369 case -NFS4ERR_DELEG_REVOKED:
1370 case -NFS4ERR_ADMIN_REVOKED:
1371 case -NFS4ERR_BAD_STATEID:
1372 nfs_inode_find_state_and_recover(state->inode,
1373 stateid);
1374 nfs4_schedule_stateid_recovery(server, state);
1375 case -EKEYEXPIRED:
1376 /*
1377 * User RPCSEC_GSS context has expired.
1378 * We cannot recover this stateid now, so
1379 * skip it and allow recovery thread to
1380 * proceed.
1381 */
1382 case -ENOMEM:
1383 err = 0;
1384 goto out;
1385 }
1386 err = nfs4_handle_exception(server, err, &exception);
1387 } while (exception.retry);
1388out:
1389 return err;
1390}
1391
1392static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1393{
1394 struct nfs4_opendata *data = calldata;
1395
1396 data->rpc_status = task->tk_status;
1397 if (data->rpc_status == 0) {
1398 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1399 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1400 renew_lease(data->o_res.server, data->timestamp);
1401 data->rpc_done = 1;
1402 }
1403}
1404
1405static void nfs4_open_confirm_release(void *calldata)
1406{
1407 struct nfs4_opendata *data = calldata;
1408 struct nfs4_state *state = NULL;
1409
1410 /* If this request hasn't been cancelled, do nothing */
1411 if (data->cancelled == 0)
1412 goto out_free;
1413 /* In case of error, no cleanup! */
1414 if (!data->rpc_done)
1415 goto out_free;
1416 state = nfs4_opendata_to_nfs4_state(data);
1417 if (!IS_ERR(state))
1418 nfs4_close_state(state, data->o_arg.fmode);
1419out_free:
1420 nfs4_opendata_put(data);
1421}
1422
1423static const struct rpc_call_ops nfs4_open_confirm_ops = {
1424 .rpc_call_done = nfs4_open_confirm_done,
1425 .rpc_release = nfs4_open_confirm_release,
1426};
1427
1428/*
1429 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1430 */
1431static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1432{
1433 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1434 struct rpc_task *task;
1435 struct rpc_message msg = {
1436 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1437 .rpc_argp = &data->c_arg,
1438 .rpc_resp = &data->c_res,
1439 .rpc_cred = data->owner->so_cred,
1440 };
1441 struct rpc_task_setup task_setup_data = {
1442 .rpc_client = server->client,
1443 .rpc_message = &msg,
1444 .callback_ops = &nfs4_open_confirm_ops,
1445 .callback_data = data,
1446 .workqueue = nfsiod_workqueue,
1447 .flags = RPC_TASK_ASYNC,
1448 };
1449 int status;
1450
1451 kref_get(&data->kref);
1452 data->rpc_done = 0;
1453 data->rpc_status = 0;
1454 data->timestamp = jiffies;
1455 task = rpc_run_task(&task_setup_data);
1456 if (IS_ERR(task))
1457 return PTR_ERR(task);
1458 status = nfs4_wait_for_completion_rpc_task(task);
1459 if (status != 0) {
1460 data->cancelled = 1;
1461 smp_wmb();
1462 } else
1463 status = data->rpc_status;
1464 rpc_put_task(task);
1465 return status;
1466}
1467
1468static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1469{
1470 struct nfs4_opendata *data = calldata;
1471 struct nfs4_state_owner *sp = data->owner;
1472
1473 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1474 return;
1475 /*
1476 * Check if we still need to send an OPEN call, or if we can use
1477 * a delegation instead.
1478 */
1479 if (data->state != NULL) {
1480 struct nfs_delegation *delegation;
1481
1482 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1483 goto out_no_action;
1484 rcu_read_lock();
1485 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1486 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1487 can_open_delegated(delegation, data->o_arg.fmode))
1488 goto unlock_no_action;
1489 rcu_read_unlock();
1490 }
1491 /* Update client id. */
1492 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1493 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1494 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1495 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1496 }
1497 data->timestamp = jiffies;
1498 if (nfs4_setup_sequence(data->o_arg.server,
1499 &data->o_arg.seq_args,
1500 &data->o_res.seq_res, task))
1501 return;
1502 rpc_call_start(task);
1503 return;
1504unlock_no_action:
1505 rcu_read_unlock();
1506out_no_action:
1507 task->tk_action = NULL;
1508
1509}
1510
1511static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1512{
1513 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1514 nfs4_open_prepare(task, calldata);
1515}
1516
1517static void nfs4_open_done(struct rpc_task *task, void *calldata)
1518{
1519 struct nfs4_opendata *data = calldata;
1520
1521 data->rpc_status = task->tk_status;
1522
1523 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1524 return;
1525
1526 if (task->tk_status == 0) {
1527 switch (data->o_res.f_attr->mode & S_IFMT) {
1528 case S_IFREG:
1529 break;
1530 case S_IFLNK:
1531 data->rpc_status = -ELOOP;
1532 break;
1533 case S_IFDIR:
1534 data->rpc_status = -EISDIR;
1535 break;
1536 default:
1537 data->rpc_status = -ENOTDIR;
1538 }
1539 renew_lease(data->o_res.server, data->timestamp);
1540 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1541 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1542 }
1543 data->rpc_done = 1;
1544}
1545
1546static void nfs4_open_release(void *calldata)
1547{
1548 struct nfs4_opendata *data = calldata;
1549 struct nfs4_state *state = NULL;
1550
1551 /* If this request hasn't been cancelled, do nothing */
1552 if (data->cancelled == 0)
1553 goto out_free;
1554 /* In case of error, no cleanup! */
1555 if (data->rpc_status != 0 || !data->rpc_done)
1556 goto out_free;
1557 /* In case we need an open_confirm, no cleanup! */
1558 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1559 goto out_free;
1560 state = nfs4_opendata_to_nfs4_state(data);
1561 if (!IS_ERR(state))
1562 nfs4_close_state(state, data->o_arg.fmode);
1563out_free:
1564 nfs4_opendata_put(data);
1565}
1566
1567static const struct rpc_call_ops nfs4_open_ops = {
1568 .rpc_call_prepare = nfs4_open_prepare,
1569 .rpc_call_done = nfs4_open_done,
1570 .rpc_release = nfs4_open_release,
1571};
1572
1573static const struct rpc_call_ops nfs4_recover_open_ops = {
1574 .rpc_call_prepare = nfs4_recover_open_prepare,
1575 .rpc_call_done = nfs4_open_done,
1576 .rpc_release = nfs4_open_release,
1577};
1578
1579static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1580{
1581 struct inode *dir = data->dir->d_inode;
1582 struct nfs_server *server = NFS_SERVER(dir);
1583 struct nfs_openargs *o_arg = &data->o_arg;
1584 struct nfs_openres *o_res = &data->o_res;
1585 struct rpc_task *task;
1586 struct rpc_message msg = {
1587 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1588 .rpc_argp = o_arg,
1589 .rpc_resp = o_res,
1590 .rpc_cred = data->owner->so_cred,
1591 };
1592 struct rpc_task_setup task_setup_data = {
1593 .rpc_client = server->client,
1594 .rpc_message = &msg,
1595 .callback_ops = &nfs4_open_ops,
1596 .callback_data = data,
1597 .workqueue = nfsiod_workqueue,
1598 .flags = RPC_TASK_ASYNC,
1599 };
1600 int status;
1601
1602 nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1603 kref_get(&data->kref);
1604 data->rpc_done = 0;
1605 data->rpc_status = 0;
1606 data->cancelled = 0;
1607 if (isrecover)
1608 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1609 task = rpc_run_task(&task_setup_data);
1610 if (IS_ERR(task))
1611 return PTR_ERR(task);
1612 status = nfs4_wait_for_completion_rpc_task(task);
1613 if (status != 0) {
1614 data->cancelled = 1;
1615 smp_wmb();
1616 } else
1617 status = data->rpc_status;
1618 rpc_put_task(task);
1619
1620 return status;
1621}
1622
1623static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1624{
1625 struct inode *dir = data->dir->d_inode;
1626 struct nfs_openres *o_res = &data->o_res;
1627 int status;
1628
1629 status = nfs4_run_open_task(data, 1);
1630 if (status != 0 || !data->rpc_done)
1631 return status;
1632
1633 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1634
1635 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1636 status = _nfs4_proc_open_confirm(data);
1637 if (status != 0)
1638 return status;
1639 }
1640
1641 return status;
1642}
1643
1644/*
1645 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1646 */
1647static int _nfs4_proc_open(struct nfs4_opendata *data)
1648{
1649 struct inode *dir = data->dir->d_inode;
1650 struct nfs_server *server = NFS_SERVER(dir);
1651 struct nfs_openargs *o_arg = &data->o_arg;
1652 struct nfs_openres *o_res = &data->o_res;
1653 int status;
1654
1655 status = nfs4_run_open_task(data, 0);
1656 if (!data->rpc_done)
1657 return status;
1658 if (status != 0) {
1659 if (status == -NFS4ERR_BADNAME &&
1660 !(o_arg->open_flags & O_CREAT))
1661 return -ENOENT;
1662 return status;
1663 }
1664
1665 nfs_fattr_map_and_free_names(server, &data->f_attr);
1666
1667 if (o_arg->open_flags & O_CREAT)
1668 update_changeattr(dir, &o_res->cinfo);
1669 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1670 server->caps &= ~NFS_CAP_POSIX_LOCK;
1671 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1672 status = _nfs4_proc_open_confirm(data);
1673 if (status != 0)
1674 return status;
1675 }
1676 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1677 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1678 return 0;
1679}
1680
1681static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1682{
1683 unsigned int loop;
1684 int ret;
1685
1686 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1687 ret = nfs4_wait_clnt_recover(clp);
1688 if (ret != 0)
1689 break;
1690 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1691 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1692 break;
1693 nfs4_schedule_state_manager(clp);
1694 ret = -EIO;
1695 }
1696 return ret;
1697}
1698
1699static int nfs4_recover_expired_lease(struct nfs_server *server)
1700{
1701 return nfs4_client_recover_expired_lease(server->nfs_client);
1702}
1703
1704/*
1705 * OPEN_EXPIRED:
1706 * reclaim state on the server after a network partition.
1707 * Assumes caller holds the appropriate lock
1708 */
1709static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1710{
1711 struct nfs4_opendata *opendata;
1712 int ret;
1713
1714 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1715 if (IS_ERR(opendata))
1716 return PTR_ERR(opendata);
1717 ret = nfs4_open_recover(opendata, state);
1718 if (ret == -ESTALE)
1719 d_drop(ctx->dentry);
1720 nfs4_opendata_put(opendata);
1721 return ret;
1722}
1723
1724static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1725{
1726 struct nfs_server *server = NFS_SERVER(state->inode);
1727 struct nfs4_exception exception = { };
1728 int err;
1729
1730 do {
1731 err = _nfs4_open_expired(ctx, state);
1732 switch (err) {
1733 default:
1734 goto out;
1735 case -NFS4ERR_GRACE:
1736 case -NFS4ERR_DELAY:
1737 nfs4_handle_exception(server, err, &exception);
1738 err = 0;
1739 }
1740 } while (exception.retry);
1741out:
1742 return err;
1743}
1744
1745static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1746{
1747 struct nfs_open_context *ctx;
1748 int ret;
1749
1750 ctx = nfs4_state_find_open_context(state);
1751 if (IS_ERR(ctx))
1752 return PTR_ERR(ctx);
1753 ret = nfs4_do_open_expired(ctx, state);
1754 put_nfs_open_context(ctx);
1755 return ret;
1756}
1757
1758#if defined(CONFIG_NFS_V4_1)
1759static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1760{
1761 int status = NFS_OK;
1762 struct nfs_server *server = NFS_SERVER(state->inode);
1763
1764 if (state->flags & flags) {
1765 status = nfs41_test_stateid(server, stateid);
1766 if (status != NFS_OK) {
1767 nfs41_free_stateid(server, stateid);
1768 state->flags &= ~flags;
1769 }
1770 }
1771 return status;
1772}
1773
1774static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1775{
1776 int deleg_status, open_status;
1777 int deleg_flags = 1 << NFS_DELEGATED_STATE;
1778 int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1779
1780 deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1781 open_status = nfs41_check_expired_stateid(state, &state->open_stateid, open_flags);
1782
1783 if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1784 return NFS_OK;
1785 return nfs4_open_expired(sp, state);
1786}
1787#endif
1788
1789/*
1790 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1791 * fields corresponding to attributes that were used to store the verifier.
1792 * Make sure we clobber those fields in the later setattr call
1793 */
1794static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1795{
1796 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1797 !(sattr->ia_valid & ATTR_ATIME_SET))
1798 sattr->ia_valid |= ATTR_ATIME;
1799
1800 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1801 !(sattr->ia_valid & ATTR_MTIME_SET))
1802 sattr->ia_valid |= ATTR_MTIME;
1803}
1804
1805/*
1806 * Returns a referenced nfs4_state
1807 */
1808static int _nfs4_do_open(struct inode *dir,
1809 struct dentry *dentry,
1810 fmode_t fmode,
1811 int flags,
1812 struct iattr *sattr,
1813 struct rpc_cred *cred,
1814 struct nfs4_state **res,
1815 struct nfs4_threshold **ctx_th)
1816{
1817 struct nfs4_state_owner *sp;
1818 struct nfs4_state *state = NULL;
1819 struct nfs_server *server = NFS_SERVER(dir);
1820 struct nfs4_opendata *opendata;
1821 int status;
1822
1823 /* Protect against reboot recovery conflicts */
1824 status = -ENOMEM;
1825 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1826 if (sp == NULL) {
1827 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1828 goto out_err;
1829 }
1830 status = nfs4_recover_expired_lease(server);
1831 if (status != 0)
1832 goto err_put_state_owner;
1833 if (dentry->d_inode != NULL)
1834 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1835 status = -ENOMEM;
1836 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1837 if (opendata == NULL)
1838 goto err_put_state_owner;
1839
1840 if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1841 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1842 if (!opendata->f_attr.mdsthreshold)
1843 goto err_opendata_put;
1844 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1845 }
1846 if (dentry->d_inode != NULL)
1847 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1848
1849 status = _nfs4_proc_open(opendata);
1850 if (status != 0)
1851 goto err_opendata_put;
1852
1853 state = nfs4_opendata_to_nfs4_state(opendata);
1854 status = PTR_ERR(state);
1855 if (IS_ERR(state))
1856 goto err_opendata_put;
1857 if (server->caps & NFS_CAP_POSIX_LOCK)
1858 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1859
1860 if (opendata->o_arg.open_flags & O_EXCL) {
1861 nfs4_exclusive_attrset(opendata, sattr);
1862
1863 nfs_fattr_init(opendata->o_res.f_attr);
1864 status = nfs4_do_setattr(state->inode, cred,
1865 opendata->o_res.f_attr, sattr,
1866 state);
1867 if (status == 0)
1868 nfs_setattr_update_inode(state->inode, sattr);
1869 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1870 }
1871
1872 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1873 *ctx_th = opendata->f_attr.mdsthreshold;
1874 else
1875 kfree(opendata->f_attr.mdsthreshold);
1876 opendata->f_attr.mdsthreshold = NULL;
1877
1878 nfs4_opendata_put(opendata);
1879 nfs4_put_state_owner(sp);
1880 *res = state;
1881 return 0;
1882err_opendata_put:
1883 kfree(opendata->f_attr.mdsthreshold);
1884 nfs4_opendata_put(opendata);
1885err_put_state_owner:
1886 nfs4_put_state_owner(sp);
1887out_err:
1888 *res = NULL;
1889 return status;
1890}
1891
1892
1893static struct nfs4_state *nfs4_do_open(struct inode *dir,
1894 struct dentry *dentry,
1895 fmode_t fmode,
1896 int flags,
1897 struct iattr *sattr,
1898 struct rpc_cred *cred,
1899 struct nfs4_threshold **ctx_th)
1900{
1901 struct nfs4_exception exception = { };
1902 struct nfs4_state *res;
1903 int status;
1904
1905 fmode &= FMODE_READ|FMODE_WRITE;
1906 do {
1907 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1908 &res, ctx_th);
1909 if (status == 0)
1910 break;
1911 /* NOTE: BAD_SEQID means the server and client disagree about the
1912 * book-keeping w.r.t. state-changing operations
1913 * (OPEN/CLOSE/LOCK/LOCKU...)
1914 * It is actually a sign of a bug on the client or on the server.
1915 *
1916 * If we receive a BAD_SEQID error in the particular case of
1917 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1918 * have unhashed the old state_owner for us, and that we can
1919 * therefore safely retry using a new one. We should still warn
1920 * the user though...
1921 */
1922 if (status == -NFS4ERR_BAD_SEQID) {
1923 pr_warn_ratelimited("NFS: v4 server %s "
1924 " returned a bad sequence-id error!\n",
1925 NFS_SERVER(dir)->nfs_client->cl_hostname);
1926 exception.retry = 1;
1927 continue;
1928 }
1929 /*
1930 * BAD_STATEID on OPEN means that the server cancelled our
1931 * state before it received the OPEN_CONFIRM.
1932 * Recover by retrying the request as per the discussion
1933 * on Page 181 of RFC3530.
1934 */
1935 if (status == -NFS4ERR_BAD_STATEID) {
1936 exception.retry = 1;
1937 continue;
1938 }
1939 if (status == -EAGAIN) {
1940 /* We must have found a delegation */
1941 exception.retry = 1;
1942 continue;
1943 }
1944 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1945 status, &exception));
1946 } while (exception.retry);
1947 return res;
1948}
1949
1950static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1951 struct nfs_fattr *fattr, struct iattr *sattr,
1952 struct nfs4_state *state)
1953{
1954 struct nfs_server *server = NFS_SERVER(inode);
1955 struct nfs_setattrargs arg = {
1956 .fh = NFS_FH(inode),
1957 .iap = sattr,
1958 .server = server,
1959 .bitmask = server->attr_bitmask,
1960 };
1961 struct nfs_setattrres res = {
1962 .fattr = fattr,
1963 .server = server,
1964 };
1965 struct rpc_message msg = {
1966 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1967 .rpc_argp = &arg,
1968 .rpc_resp = &res,
1969 .rpc_cred = cred,
1970 };
1971 unsigned long timestamp = jiffies;
1972 int status;
1973
1974 nfs_fattr_init(fattr);
1975
1976 if (state != NULL) {
1977 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1978 current->files, current->tgid);
1979 } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1980 FMODE_WRITE)) {
1981 /* Use that stateid */
1982 } else
1983 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1984
1985 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1986 if (status == 0 && state != NULL)
1987 renew_lease(server, timestamp);
1988 return status;
1989}
1990
1991static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1992 struct nfs_fattr *fattr, struct iattr *sattr,
1993 struct nfs4_state *state)
1994{
1995 struct nfs_server *server = NFS_SERVER(inode);
1996 struct nfs4_exception exception = {
1997 .state = state,
1998 .inode = inode,
1999 };
2000 int err;
2001 do {
2002 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2003 switch (err) {
2004 case -NFS4ERR_OPENMODE:
2005 if (state && !(state->state & FMODE_WRITE)) {
2006 err = -EBADF;
2007 if (sattr->ia_valid & ATTR_OPEN)
2008 err = -EACCES;
2009 goto out;
2010 }
2011 }
2012 err = nfs4_handle_exception(server, err, &exception);
2013 } while (exception.retry);
2014out:
2015 return err;
2016}
2017
2018struct nfs4_closedata {
2019 struct inode *inode;
2020 struct nfs4_state *state;
2021 struct nfs_closeargs arg;
2022 struct nfs_closeres res;
2023 struct nfs_fattr fattr;
2024 unsigned long timestamp;
2025 bool roc;
2026 u32 roc_barrier;
2027};
2028
2029static void nfs4_free_closedata(void *data)
2030{
2031 struct nfs4_closedata *calldata = data;
2032 struct nfs4_state_owner *sp = calldata->state->owner;
2033 struct super_block *sb = calldata->state->inode->i_sb;
2034
2035 if (calldata->roc)
2036 pnfs_roc_release(calldata->state->inode);
2037 nfs4_put_open_state(calldata->state);
2038 nfs_free_seqid(calldata->arg.seqid);
2039 nfs4_put_state_owner(sp);
2040 nfs_sb_deactive(sb);
2041 kfree(calldata);
2042}
2043
2044static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2045 fmode_t fmode)
2046{
2047 spin_lock(&state->owner->so_lock);
2048 if (!(fmode & FMODE_READ))
2049 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2050 if (!(fmode & FMODE_WRITE))
2051 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2052 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2053 spin_unlock(&state->owner->so_lock);
2054}
2055
2056static void nfs4_close_done(struct rpc_task *task, void *data)
2057{
2058 struct nfs4_closedata *calldata = data;
2059 struct nfs4_state *state = calldata->state;
2060 struct nfs_server *server = NFS_SERVER(calldata->inode);
2061
2062 dprintk("%s: begin!\n", __func__);
2063 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2064 return;
2065 /* hmm. we are done with the inode, and in the process of freeing
2066 * the state_owner. we keep this around to process errors
2067 */
2068 switch (task->tk_status) {
2069 case 0:
2070 if (calldata->roc)
2071 pnfs_roc_set_barrier(state->inode,
2072 calldata->roc_barrier);
2073 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2074 renew_lease(server, calldata->timestamp);
2075 nfs4_close_clear_stateid_flags(state,
2076 calldata->arg.fmode);
2077 break;
2078 case -NFS4ERR_STALE_STATEID:
2079 case -NFS4ERR_OLD_STATEID:
2080 case -NFS4ERR_BAD_STATEID:
2081 case -NFS4ERR_EXPIRED:
2082 if (calldata->arg.fmode == 0)
2083 break;
2084 default:
2085 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2086 rpc_restart_call_prepare(task);
2087 }
2088 nfs_release_seqid(calldata->arg.seqid);
2089 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2090 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2091}
2092
2093static void nfs4_close_prepare(struct rpc_task *task, void *data)
2094{
2095 struct nfs4_closedata *calldata = data;
2096 struct nfs4_state *state = calldata->state;
2097 int call_close = 0;
2098
2099 dprintk("%s: begin!\n", __func__);
2100 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2101 return;
2102
2103 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2104 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2105 spin_lock(&state->owner->so_lock);
2106 /* Calculate the change in open mode */
2107 if (state->n_rdwr == 0) {
2108 if (state->n_rdonly == 0) {
2109 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2110 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2111 calldata->arg.fmode &= ~FMODE_READ;
2112 }
2113 if (state->n_wronly == 0) {
2114 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2115 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2116 calldata->arg.fmode &= ~FMODE_WRITE;
2117 }
2118 }
2119 spin_unlock(&state->owner->so_lock);
2120
2121 if (!call_close) {
2122 /* Note: exit _without_ calling nfs4_close_done */
2123 task->tk_action = NULL;
2124 goto out;
2125 }
2126
2127 if (calldata->arg.fmode == 0) {
2128 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2129 if (calldata->roc &&
2130 pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2131 rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2132 task, NULL);
2133 goto out;
2134 }
2135 }
2136
2137 nfs_fattr_init(calldata->res.fattr);
2138 calldata->timestamp = jiffies;
2139 if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2140 &calldata->arg.seq_args,
2141 &calldata->res.seq_res,
2142 task))
2143 goto out;
2144 rpc_call_start(task);
2145out:
2146 dprintk("%s: done!\n", __func__);
2147}
2148
2149static const struct rpc_call_ops nfs4_close_ops = {
2150 .rpc_call_prepare = nfs4_close_prepare,
2151 .rpc_call_done = nfs4_close_done,
2152 .rpc_release = nfs4_free_closedata,
2153};
2154
2155/*
2156 * It is possible for data to be read/written from a mem-mapped file
2157 * after the sys_close call (which hits the vfs layer as a flush).
2158 * This means that we can't safely call nfsv4 close on a file until
2159 * the inode is cleared. This in turn means that we are not good
2160 * NFSv4 citizens - we do not indicate to the server to update the file's
2161 * share state even when we are done with one of the three share
2162 * stateid's in the inode.
2163 *
2164 * NOTE: Caller must be holding the sp->so_owner semaphore!
2165 */
2166int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2167{
2168 struct nfs_server *server = NFS_SERVER(state->inode);
2169 struct nfs4_closedata *calldata;
2170 struct nfs4_state_owner *sp = state->owner;
2171 struct rpc_task *task;
2172 struct rpc_message msg = {
2173 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2174 .rpc_cred = state->owner->so_cred,
2175 };
2176 struct rpc_task_setup task_setup_data = {
2177 .rpc_client = server->client,
2178 .rpc_message = &msg,
2179 .callback_ops = &nfs4_close_ops,
2180 .workqueue = nfsiod_workqueue,
2181 .flags = RPC_TASK_ASYNC,
2182 };
2183 int status = -ENOMEM;
2184
2185 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2186 if (calldata == NULL)
2187 goto out;
2188 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2189 calldata->inode = state->inode;
2190 calldata->state = state;
2191 calldata->arg.fh = NFS_FH(state->inode);
2192 calldata->arg.stateid = &state->open_stateid;
2193 /* Serialization for the sequence id */
2194 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2195 if (calldata->arg.seqid == NULL)
2196 goto out_free_calldata;
2197 calldata->arg.fmode = 0;
2198 calldata->arg.bitmask = server->cache_consistency_bitmask;
2199 calldata->res.fattr = &calldata->fattr;
2200 calldata->res.seqid = calldata->arg.seqid;
2201 calldata->res.server = server;
2202 calldata->roc = roc;
2203 nfs_sb_active(calldata->inode->i_sb);
2204
2205 msg.rpc_argp = &calldata->arg;
2206 msg.rpc_resp = &calldata->res;
2207 task_setup_data.callback_data = calldata;
2208 task = rpc_run_task(&task_setup_data);
2209 if (IS_ERR(task))
2210 return PTR_ERR(task);
2211 status = 0;
2212 if (wait)
2213 status = rpc_wait_for_completion_task(task);
2214 rpc_put_task(task);
2215 return status;
2216out_free_calldata:
2217 kfree(calldata);
2218out:
2219 if (roc)
2220 pnfs_roc_release(state->inode);
2221 nfs4_put_open_state(state);
2222 nfs4_put_state_owner(sp);
2223 return status;
2224}
2225
2226static struct inode *
2227nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2228{
2229 struct nfs4_state *state;
2230
2231 /* Protect against concurrent sillydeletes */
2232 state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2233 ctx->cred, &ctx->mdsthreshold);
2234 if (IS_ERR(state))
2235 return ERR_CAST(state);
2236 ctx->state = state;
2237 return igrab(state->inode);
2238}
2239
2240static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2241{
2242 if (ctx->state == NULL)
2243 return;
2244 if (is_sync)
2245 nfs4_close_sync(ctx->state, ctx->mode);
2246 else
2247 nfs4_close_state(ctx->state, ctx->mode);
2248}
2249
2250static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2251{
2252 struct nfs4_server_caps_arg args = {
2253 .fhandle = fhandle,
2254 };
2255 struct nfs4_server_caps_res res = {};
2256 struct rpc_message msg = {
2257 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2258 .rpc_argp = &args,
2259 .rpc_resp = &res,
2260 };
2261 int status;
2262
2263 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2264 if (status == 0) {
2265 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2266 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2267 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2268 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2269 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2270 NFS_CAP_CTIME|NFS_CAP_MTIME);
2271 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2272 server->caps |= NFS_CAP_ACLS;
2273 if (res.has_links != 0)
2274 server->caps |= NFS_CAP_HARDLINKS;
2275 if (res.has_symlinks != 0)
2276 server->caps |= NFS_CAP_SYMLINKS;
2277 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2278 server->caps |= NFS_CAP_FILEID;
2279 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2280 server->caps |= NFS_CAP_MODE;
2281 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2282 server->caps |= NFS_CAP_NLINK;
2283 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2284 server->caps |= NFS_CAP_OWNER;
2285 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2286 server->caps |= NFS_CAP_OWNER_GROUP;
2287 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2288 server->caps |= NFS_CAP_ATIME;
2289 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2290 server->caps |= NFS_CAP_CTIME;
2291 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2292 server->caps |= NFS_CAP_MTIME;
2293
2294 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2295 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2296 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2297 server->acl_bitmask = res.acl_bitmask;
2298 server->fh_expire_type = res.fh_expire_type;
2299 }
2300
2301 return status;
2302}
2303
2304int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2305{
2306 struct nfs4_exception exception = { };
2307 int err;
2308 do {
2309 err = nfs4_handle_exception(server,
2310 _nfs4_server_capabilities(server, fhandle),
2311 &exception);
2312 } while (exception.retry);
2313 return err;
2314}
2315
2316static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2317 struct nfs_fsinfo *info)
2318{
2319 struct nfs4_lookup_root_arg args = {
2320 .bitmask = nfs4_fattr_bitmap,
2321 };
2322 struct nfs4_lookup_res res = {
2323 .server = server,
2324 .fattr = info->fattr,
2325 .fh = fhandle,
2326 };
2327 struct rpc_message msg = {
2328 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2329 .rpc_argp = &args,
2330 .rpc_resp = &res,
2331 };
2332
2333 nfs_fattr_init(info->fattr);
2334 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2335}
2336
2337static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2338 struct nfs_fsinfo *info)
2339{
2340 struct nfs4_exception exception = { };
2341 int err;
2342 do {
2343 err = _nfs4_lookup_root(server, fhandle, info);
2344 switch (err) {
2345 case 0:
2346 case -NFS4ERR_WRONGSEC:
2347 goto out;
2348 default:
2349 err = nfs4_handle_exception(server, err, &exception);
2350 }
2351 } while (exception.retry);
2352out:
2353 return err;
2354}
2355
2356static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2357 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2358{
2359 struct rpc_auth *auth;
2360 int ret;
2361
2362 auth = rpcauth_create(flavor, server->client);
2363 if (!auth) {
2364 ret = -EIO;
2365 goto out;
2366 }
2367 ret = nfs4_lookup_root(server, fhandle, info);
2368out:
2369 return ret;
2370}
2371
2372static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2373 struct nfs_fsinfo *info)
2374{
2375 int i, len, status = 0;
2376 rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2377
2378 len = gss_mech_list_pseudoflavors(&flav_array[0]);
2379 flav_array[len] = RPC_AUTH_NULL;
2380 len += 1;
2381
2382 for (i = 0; i < len; i++) {
2383 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2384 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2385 continue;
2386 break;
2387 }
2388 /*
2389 * -EACCESS could mean that the user doesn't have correct permissions
2390 * to access the mount. It could also mean that we tried to mount
2391 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2392 * existing mount programs don't handle -EACCES very well so it should
2393 * be mapped to -EPERM instead.
2394 */
2395 if (status == -EACCES)
2396 status = -EPERM;
2397 return status;
2398}
2399
2400/*
2401 * get the file handle for the "/" directory on the server
2402 */
2403int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2404 struct nfs_fsinfo *info)
2405{
2406 int minor_version = server->nfs_client->cl_minorversion;
2407 int status = nfs4_lookup_root(server, fhandle, info);
2408 if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2409 /*
2410 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2411 * by nfs4_map_errors() as this function exits.
2412 */
2413 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2414 if (status == 0)
2415 status = nfs4_server_capabilities(server, fhandle);
2416 if (status == 0)
2417 status = nfs4_do_fsinfo(server, fhandle, info);
2418 return nfs4_map_errors(status);
2419}
2420
2421static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2422 struct nfs_fsinfo *info)
2423{
2424 int error;
2425 struct nfs_fattr *fattr = info->fattr;
2426
2427 error = nfs4_server_capabilities(server, mntfh);
2428 if (error < 0) {
2429 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2430 return error;
2431 }
2432
2433 error = nfs4_proc_getattr(server, mntfh, fattr);
2434 if (error < 0) {
2435 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2436 return error;
2437 }
2438
2439 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2440 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2441 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2442
2443 return error;
2444}
2445
2446/*
2447 * Get locations and (maybe) other attributes of a referral.
2448 * Note that we'll actually follow the referral later when
2449 * we detect fsid mismatch in inode revalidation
2450 */
2451static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2452 const struct qstr *name, struct nfs_fattr *fattr,
2453 struct nfs_fh *fhandle)
2454{
2455 int status = -ENOMEM;
2456 struct page *page = NULL;
2457 struct nfs4_fs_locations *locations = NULL;
2458
2459 page = alloc_page(GFP_KERNEL);
2460 if (page == NULL)
2461 goto out;
2462 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2463 if (locations == NULL)
2464 goto out;
2465
2466 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2467 if (status != 0)
2468 goto out;
2469 /* Make sure server returned a different fsid for the referral */
2470 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2471 dprintk("%s: server did not return a different fsid for"
2472 " a referral at %s\n", __func__, name->name);
2473 status = -EIO;
2474 goto out;
2475 }
2476 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2477 nfs_fixup_referral_attributes(&locations->fattr);
2478
2479 /* replace the lookup nfs_fattr with the locations nfs_fattr */
2480 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2481 memset(fhandle, 0, sizeof(struct nfs_fh));
2482out:
2483 if (page)
2484 __free_page(page);
2485 kfree(locations);
2486 return status;
2487}
2488
2489static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2490{
2491 struct nfs4_getattr_arg args = {
2492 .fh = fhandle,
2493 .bitmask = server->attr_bitmask,
2494 };
2495 struct nfs4_getattr_res res = {
2496 .fattr = fattr,
2497 .server = server,
2498 };
2499 struct rpc_message msg = {
2500 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2501 .rpc_argp = &args,
2502 .rpc_resp = &res,
2503 };
2504
2505 nfs_fattr_init(fattr);
2506 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2507}
2508
2509static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2510{
2511 struct nfs4_exception exception = { };
2512 int err;
2513 do {
2514 err = nfs4_handle_exception(server,
2515 _nfs4_proc_getattr(server, fhandle, fattr),
2516 &exception);
2517 } while (exception.retry);
2518 return err;
2519}
2520
2521/*
2522 * The file is not closed if it is opened due to the a request to change
2523 * the size of the file. The open call will not be needed once the
2524 * VFS layer lookup-intents are implemented.
2525 *
2526 * Close is called when the inode is destroyed.
2527 * If we haven't opened the file for O_WRONLY, we
2528 * need to in the size_change case to obtain a stateid.
2529 *
2530 * Got race?
2531 * Because OPEN is always done by name in nfsv4, it is
2532 * possible that we opened a different file by the same
2533 * name. We can recognize this race condition, but we
2534 * can't do anything about it besides returning an error.
2535 *
2536 * This will be fixed with VFS changes (lookup-intent).
2537 */
2538static int
2539nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2540 struct iattr *sattr)
2541{
2542 struct inode *inode = dentry->d_inode;
2543 struct rpc_cred *cred = NULL;
2544 struct nfs4_state *state = NULL;
2545 int status;
2546
2547 if (pnfs_ld_layoutret_on_setattr(inode))
2548 pnfs_return_layout(inode);
2549
2550 nfs_fattr_init(fattr);
2551
2552 /* Deal with open(O_TRUNC) */
2553 if (sattr->ia_valid & ATTR_OPEN)
2554 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2555
2556 /* Optimization: if the end result is no change, don't RPC */
2557 if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2558 return 0;
2559
2560 /* Search for an existing open(O_WRITE) file */
2561 if (sattr->ia_valid & ATTR_FILE) {
2562 struct nfs_open_context *ctx;
2563
2564 ctx = nfs_file_open_context(sattr->ia_file);
2565 if (ctx) {
2566 cred = ctx->cred;
2567 state = ctx->state;
2568 }
2569 }
2570
2571 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2572 if (status == 0)
2573 nfs_setattr_update_inode(inode, sattr);
2574 return status;
2575}
2576
2577static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2578 const struct qstr *name, struct nfs_fh *fhandle,
2579 struct nfs_fattr *fattr)
2580{
2581 struct nfs_server *server = NFS_SERVER(dir);
2582 int status;
2583 struct nfs4_lookup_arg args = {
2584 .bitmask = server->attr_bitmask,
2585 .dir_fh = NFS_FH(dir),
2586 .name = name,
2587 };
2588 struct nfs4_lookup_res res = {
2589 .server = server,
2590 .fattr = fattr,
2591 .fh = fhandle,
2592 };
2593 struct rpc_message msg = {
2594 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2595 .rpc_argp = &args,
2596 .rpc_resp = &res,
2597 };
2598
2599 nfs_fattr_init(fattr);
2600
2601 dprintk("NFS call lookup %s\n", name->name);
2602 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2603 dprintk("NFS reply lookup: %d\n", status);
2604 return status;
2605}
2606
2607static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2608{
2609 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2610 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2611 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2612 fattr->nlink = 2;
2613}
2614
2615static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2616 struct qstr *name, struct nfs_fh *fhandle,
2617 struct nfs_fattr *fattr)
2618{
2619 struct nfs4_exception exception = { };
2620 struct rpc_clnt *client = *clnt;
2621 int err;
2622 do {
2623 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2624 switch (err) {
2625 case -NFS4ERR_BADNAME:
2626 err = -ENOENT;
2627 goto out;
2628 case -NFS4ERR_MOVED:
2629 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2630 goto out;
2631 case -NFS4ERR_WRONGSEC:
2632 err = -EPERM;
2633 if (client != *clnt)
2634 goto out;
2635
2636 client = nfs4_create_sec_client(client, dir, name);
2637 if (IS_ERR(client))
2638 return PTR_ERR(client);
2639
2640 exception.retry = 1;
2641 break;
2642 default:
2643 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2644 }
2645 } while (exception.retry);
2646
2647out:
2648 if (err == 0)
2649 *clnt = client;
2650 else if (client != *clnt)
2651 rpc_shutdown_client(client);
2652
2653 return err;
2654}
2655
2656static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2657 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2658{
2659 int status;
2660 struct rpc_clnt *client = NFS_CLIENT(dir);
2661
2662 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2663 if (client != NFS_CLIENT(dir)) {
2664 rpc_shutdown_client(client);
2665 nfs_fixup_secinfo_attributes(fattr);
2666 }
2667 return status;
2668}
2669
2670struct rpc_clnt *
2671nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2672 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2673{
2674 int status;
2675 struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2676
2677 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2678 if (status < 0) {
2679 rpc_shutdown_client(client);
2680 return ERR_PTR(status);
2681 }
2682 return client;
2683}
2684
2685static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2686{
2687 struct nfs_server *server = NFS_SERVER(inode);
2688 struct nfs4_accessargs args = {
2689 .fh = NFS_FH(inode),
2690 .bitmask = server->cache_consistency_bitmask,
2691 };
2692 struct nfs4_accessres res = {
2693 .server = server,
2694 };
2695 struct rpc_message msg = {
2696 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2697 .rpc_argp = &args,
2698 .rpc_resp = &res,
2699 .rpc_cred = entry->cred,
2700 };
2701 int mode = entry->mask;
2702 int status;
2703
2704 /*
2705 * Determine which access bits we want to ask for...
2706 */
2707 if (mode & MAY_READ)
2708 args.access |= NFS4_ACCESS_READ;
2709 if (S_ISDIR(inode->i_mode)) {
2710 if (mode & MAY_WRITE)
2711 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2712 if (mode & MAY_EXEC)
2713 args.access |= NFS4_ACCESS_LOOKUP;
2714 } else {
2715 if (mode & MAY_WRITE)
2716 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2717 if (mode & MAY_EXEC)
2718 args.access |= NFS4_ACCESS_EXECUTE;
2719 }
2720
2721 res.fattr = nfs_alloc_fattr();
2722 if (res.fattr == NULL)
2723 return -ENOMEM;
2724
2725 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2726 if (!status) {
2727 entry->mask = 0;
2728 if (res.access & NFS4_ACCESS_READ)
2729 entry->mask |= MAY_READ;
2730 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2731 entry->mask |= MAY_WRITE;
2732 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2733 entry->mask |= MAY_EXEC;
2734 nfs_refresh_inode(inode, res.fattr);
2735 }
2736 nfs_free_fattr(res.fattr);
2737 return status;
2738}
2739
2740static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2741{
2742 struct nfs4_exception exception = { };
2743 int err;
2744 do {
2745 err = nfs4_handle_exception(NFS_SERVER(inode),
2746 _nfs4_proc_access(inode, entry),
2747 &exception);
2748 } while (exception.retry);
2749 return err;
2750}
2751
2752/*
2753 * TODO: For the time being, we don't try to get any attributes
2754 * along with any of the zero-copy operations READ, READDIR,
2755 * READLINK, WRITE.
2756 *
2757 * In the case of the first three, we want to put the GETATTR
2758 * after the read-type operation -- this is because it is hard
2759 * to predict the length of a GETATTR response in v4, and thus
2760 * align the READ data correctly. This means that the GETATTR
2761 * may end up partially falling into the page cache, and we should
2762 * shift it into the 'tail' of the xdr_buf before processing.
2763 * To do this efficiently, we need to know the total length
2764 * of data received, which doesn't seem to be available outside
2765 * of the RPC layer.
2766 *
2767 * In the case of WRITE, we also want to put the GETATTR after
2768 * the operation -- in this case because we want to make sure
2769 * we get the post-operation mtime and size. This means that
2770 * we can't use xdr_encode_pages() as written: we need a variant
2771 * of it which would leave room in the 'tail' iovec.
2772 *
2773 * Both of these changes to the XDR layer would in fact be quite
2774 * minor, but I decided to leave them for a subsequent patch.
2775 */
2776static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2777 unsigned int pgbase, unsigned int pglen)
2778{
2779 struct nfs4_readlink args = {
2780 .fh = NFS_FH(inode),
2781 .pgbase = pgbase,
2782 .pglen = pglen,
2783 .pages = &page,
2784 };
2785 struct nfs4_readlink_res res;
2786 struct rpc_message msg = {
2787 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2788 .rpc_argp = &args,
2789 .rpc_resp = &res,
2790 };
2791
2792 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2793}
2794
2795static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2796 unsigned int pgbase, unsigned int pglen)
2797{
2798 struct nfs4_exception exception = { };
2799 int err;
2800 do {
2801 err = nfs4_handle_exception(NFS_SERVER(inode),
2802 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2803 &exception);
2804 } while (exception.retry);
2805 return err;
2806}
2807
2808/*
2809 * Got race?
2810 * We will need to arrange for the VFS layer to provide an atomic open.
2811 * Until then, this create/open method is prone to inefficiency and race
2812 * conditions due to the lookup, create, and open VFS calls from sys_open()
2813 * placed on the wire.
2814 *
2815 * Given the above sorry state of affairs, I'm simply sending an OPEN.
2816 * The file will be opened again in the subsequent VFS open call
2817 * (nfs4_proc_file_open).
2818 *
2819 * The open for read will just hang around to be used by any process that
2820 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2821 */
2822
2823static int
2824nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2825 int flags, struct nfs_open_context *ctx)
2826{
2827 struct dentry *de = dentry;
2828 struct nfs4_state *state;
2829 struct rpc_cred *cred = NULL;
2830 fmode_t fmode = 0;
2831 int status = 0;
2832
2833 if (ctx != NULL) {
2834 cred = ctx->cred;
2835 de = ctx->dentry;
2836 fmode = ctx->mode;
2837 }
2838 sattr->ia_mode &= ~current_umask();
2839 state = nfs4_do_open(dir, de, fmode, flags, sattr, cred, NULL);
2840 d_drop(dentry);
2841 if (IS_ERR(state)) {
2842 status = PTR_ERR(state);
2843 goto out;
2844 }
2845 d_add(dentry, igrab(state->inode));
2846 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2847 if (ctx != NULL)
2848 ctx->state = state;
2849 else
2850 nfs4_close_sync(state, fmode);
2851out:
2852 return status;
2853}
2854
2855static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2856{
2857 struct nfs_server *server = NFS_SERVER(dir);
2858 struct nfs_removeargs args = {
2859 .fh = NFS_FH(dir),
2860 .name = *name,
2861 };
2862 struct nfs_removeres res = {
2863 .server = server,
2864 };
2865 struct rpc_message msg = {
2866 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2867 .rpc_argp = &args,
2868 .rpc_resp = &res,
2869 };
2870 int status;
2871
2872 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2873 if (status == 0)
2874 update_changeattr(dir, &res.cinfo);
2875 return status;
2876}
2877
2878static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2879{
2880 struct nfs4_exception exception = { };
2881 int err;
2882 do {
2883 err = nfs4_handle_exception(NFS_SERVER(dir),
2884 _nfs4_proc_remove(dir, name),
2885 &exception);
2886 } while (exception.retry);
2887 return err;
2888}
2889
2890static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2891{
2892 struct nfs_server *server = NFS_SERVER(dir);
2893 struct nfs_removeargs *args = msg->rpc_argp;
2894 struct nfs_removeres *res = msg->rpc_resp;
2895
2896 res->server = server;
2897 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2898 nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2899}
2900
2901static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2902{
2903 if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2904 &data->args.seq_args,
2905 &data->res.seq_res,
2906 task))
2907 return;
2908 rpc_call_start(task);
2909}
2910
2911static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2912{
2913 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2914
2915 if (!nfs4_sequence_done(task, &res->seq_res))
2916 return 0;
2917 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2918 return 0;
2919 update_changeattr(dir, &res->cinfo);
2920 return 1;
2921}
2922
2923static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2924{
2925 struct nfs_server *server = NFS_SERVER(dir);
2926 struct nfs_renameargs *arg = msg->rpc_argp;
2927 struct nfs_renameres *res = msg->rpc_resp;
2928
2929 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2930 res->server = server;
2931 nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2932}
2933
2934static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2935{
2936 if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2937 &data->args.seq_args,
2938 &data->res.seq_res,
2939 task))
2940 return;
2941 rpc_call_start(task);
2942}
2943
2944static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2945 struct inode *new_dir)
2946{
2947 struct nfs_renameres *res = task->tk_msg.rpc_resp;
2948
2949 if (!nfs4_sequence_done(task, &res->seq_res))
2950 return 0;
2951 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2952 return 0;
2953
2954 update_changeattr(old_dir, &res->old_cinfo);
2955 update_changeattr(new_dir, &res->new_cinfo);
2956 return 1;
2957}
2958
2959static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2960 struct inode *new_dir, struct qstr *new_name)
2961{
2962 struct nfs_server *server = NFS_SERVER(old_dir);
2963 struct nfs_renameargs arg = {
2964 .old_dir = NFS_FH(old_dir),
2965 .new_dir = NFS_FH(new_dir),
2966 .old_name = old_name,
2967 .new_name = new_name,
2968 };
2969 struct nfs_renameres res = {
2970 .server = server,
2971 };
2972 struct rpc_message msg = {
2973 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2974 .rpc_argp = &arg,
2975 .rpc_resp = &res,
2976 };
2977 int status = -ENOMEM;
2978
2979 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2980 if (!status) {
2981 update_changeattr(old_dir, &res.old_cinfo);
2982 update_changeattr(new_dir, &res.new_cinfo);
2983 }
2984 return status;
2985}
2986
2987static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2988 struct inode *new_dir, struct qstr *new_name)
2989{
2990 struct nfs4_exception exception = { };
2991 int err;
2992 do {
2993 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2994 _nfs4_proc_rename(old_dir, old_name,
2995 new_dir, new_name),
2996 &exception);
2997 } while (exception.retry);
2998 return err;
2999}
3000
3001static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3002{
3003 struct nfs_server *server = NFS_SERVER(inode);
3004 struct nfs4_link_arg arg = {
3005 .fh = NFS_FH(inode),
3006 .dir_fh = NFS_FH(dir),
3007 .name = name,
3008 .bitmask = server->attr_bitmask,
3009 };
3010 struct nfs4_link_res res = {
3011 .server = server,
3012 };
3013 struct rpc_message msg = {
3014 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3015 .rpc_argp = &arg,
3016 .rpc_resp = &res,
3017 };
3018 int status = -ENOMEM;
3019
3020 res.fattr = nfs_alloc_fattr();
3021 if (res.fattr == NULL)
3022 goto out;
3023
3024 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3025 if (!status) {
3026 update_changeattr(dir, &res.cinfo);
3027 nfs_post_op_update_inode(inode, res.fattr);
3028 }
3029out:
3030 nfs_free_fattr(res.fattr);
3031 return status;
3032}
3033
3034static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3035{
3036 struct nfs4_exception exception = { };
3037 int err;
3038 do {
3039 err = nfs4_handle_exception(NFS_SERVER(inode),
3040 _nfs4_proc_link(inode, dir, name),
3041 &exception);
3042 } while (exception.retry);
3043 return err;
3044}
3045
3046struct nfs4_createdata {
3047 struct rpc_message msg;
3048 struct nfs4_create_arg arg;
3049 struct nfs4_create_res res;
3050 struct nfs_fh fh;
3051 struct nfs_fattr fattr;
3052};
3053
3054static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3055 struct qstr *name, struct iattr *sattr, u32 ftype)
3056{
3057 struct nfs4_createdata *data;
3058
3059 data = kzalloc(sizeof(*data), GFP_KERNEL);
3060 if (data != NULL) {
3061 struct nfs_server *server = NFS_SERVER(dir);
3062
3063 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3064 data->msg.rpc_argp = &data->arg;
3065 data->msg.rpc_resp = &data->res;
3066 data->arg.dir_fh = NFS_FH(dir);
3067 data->arg.server = server;
3068 data->arg.name = name;
3069 data->arg.attrs = sattr;
3070 data->arg.ftype = ftype;
3071 data->arg.bitmask = server->attr_bitmask;
3072 data->res.server = server;
3073 data->res.fh = &data->fh;
3074 data->res.fattr = &data->fattr;
3075 nfs_fattr_init(data->res.fattr);
3076 }
3077 return data;
3078}
3079
3080static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3081{
3082 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3083 &data->arg.seq_args, &data->res.seq_res, 1);
3084 if (status == 0) {
3085 update_changeattr(dir, &data->res.dir_cinfo);
3086 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3087 }
3088 return status;
3089}
3090
3091static void nfs4_free_createdata(struct nfs4_createdata *data)
3092{
3093 kfree(data);
3094}
3095
3096static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3097 struct page *page, unsigned int len, struct iattr *sattr)
3098{
3099 struct nfs4_createdata *data;
3100 int status = -ENAMETOOLONG;
3101
3102 if (len > NFS4_MAXPATHLEN)
3103 goto out;
3104
3105 status = -ENOMEM;
3106 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3107 if (data == NULL)
3108 goto out;
3109
3110 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3111 data->arg.u.symlink.pages = &page;
3112 data->arg.u.symlink.len = len;
3113
3114 status = nfs4_do_create(dir, dentry, data);
3115
3116 nfs4_free_createdata(data);
3117out:
3118 return status;
3119}
3120
3121static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3122 struct page *page, unsigned int len, struct iattr *sattr)
3123{
3124 struct nfs4_exception exception = { };
3125 int err;
3126 do {
3127 err = nfs4_handle_exception(NFS_SERVER(dir),
3128 _nfs4_proc_symlink(dir, dentry, page,
3129 len, sattr),
3130 &exception);
3131 } while (exception.retry);
3132 return err;
3133}
3134
3135static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3136 struct iattr *sattr)
3137{
3138 struct nfs4_createdata *data;
3139 int status = -ENOMEM;
3140
3141 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3142 if (data == NULL)
3143 goto out;
3144
3145 status = nfs4_do_create(dir, dentry, data);
3146
3147 nfs4_free_createdata(data);
3148out:
3149 return status;
3150}
3151
3152static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3153 struct iattr *sattr)
3154{
3155 struct nfs4_exception exception = { };
3156 int err;
3157
3158 sattr->ia_mode &= ~current_umask();
3159 do {
3160 err = nfs4_handle_exception(NFS_SERVER(dir),
3161 _nfs4_proc_mkdir(dir, dentry, sattr),
3162 &exception);
3163 } while (exception.retry);
3164 return err;
3165}
3166
3167static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3168 u64 cookie, struct page **pages, unsigned int count, int plus)
3169{
3170 struct inode *dir = dentry->d_inode;
3171 struct nfs4_readdir_arg args = {
3172 .fh = NFS_FH(dir),
3173 .pages = pages,
3174 .pgbase = 0,
3175 .count = count,
3176 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3177 .plus = plus,
3178 };
3179 struct nfs4_readdir_res res;
3180 struct rpc_message msg = {
3181 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3182 .rpc_argp = &args,
3183 .rpc_resp = &res,
3184 .rpc_cred = cred,
3185 };
3186 int status;
3187
3188 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3189 dentry->d_parent->d_name.name,
3190 dentry->d_name.name,
3191 (unsigned long long)cookie);
3192 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3193 res.pgbase = args.pgbase;
3194 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3195 if (status >= 0) {
3196 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3197 status += args.pgbase;
3198 }
3199
3200 nfs_invalidate_atime(dir);
3201
3202 dprintk("%s: returns %d\n", __func__, status);
3203 return status;
3204}
3205
3206static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3207 u64 cookie, struct page **pages, unsigned int count, int plus)
3208{
3209 struct nfs4_exception exception = { };
3210 int err;
3211 do {
3212 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3213 _nfs4_proc_readdir(dentry, cred, cookie,
3214 pages, count, plus),
3215 &exception);
3216 } while (exception.retry);
3217 return err;
3218}
3219
3220static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3221 struct iattr *sattr, dev_t rdev)
3222{
3223 struct nfs4_createdata *data;
3224 int mode = sattr->ia_mode;
3225 int status = -ENOMEM;
3226
3227 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3228 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3229
3230 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3231 if (data == NULL)
3232 goto out;
3233
3234 if (S_ISFIFO(mode))
3235 data->arg.ftype = NF4FIFO;
3236 else if (S_ISBLK(mode)) {
3237 data->arg.ftype = NF4BLK;
3238 data->arg.u.device.specdata1 = MAJOR(rdev);
3239 data->arg.u.device.specdata2 = MINOR(rdev);
3240 }
3241 else if (S_ISCHR(mode)) {
3242 data->arg.ftype = NF4CHR;
3243 data->arg.u.device.specdata1 = MAJOR(rdev);
3244 data->arg.u.device.specdata2 = MINOR(rdev);
3245 }
3246
3247 status = nfs4_do_create(dir, dentry, data);
3248
3249 nfs4_free_createdata(data);
3250out:
3251 return status;
3252}
3253
3254static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3255 struct iattr *sattr, dev_t rdev)
3256{
3257 struct nfs4_exception exception = { };
3258 int err;
3259
3260 sattr->ia_mode &= ~current_umask();
3261 do {
3262 err = nfs4_handle_exception(NFS_SERVER(dir),
3263 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3264 &exception);
3265 } while (exception.retry);
3266 return err;
3267}
3268
3269static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3270 struct nfs_fsstat *fsstat)
3271{
3272 struct nfs4_statfs_arg args = {
3273 .fh = fhandle,
3274 .bitmask = server->attr_bitmask,
3275 };
3276 struct nfs4_statfs_res res = {
3277 .fsstat = fsstat,
3278 };
3279 struct rpc_message msg = {
3280 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3281 .rpc_argp = &args,
3282 .rpc_resp = &res,
3283 };
3284
3285 nfs_fattr_init(fsstat->fattr);
3286 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3287}
3288
3289static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3290{
3291 struct nfs4_exception exception = { };
3292 int err;
3293 do {
3294 err = nfs4_handle_exception(server,
3295 _nfs4_proc_statfs(server, fhandle, fsstat),
3296 &exception);
3297 } while (exception.retry);
3298 return err;
3299}
3300
3301static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3302 struct nfs_fsinfo *fsinfo)
3303{
3304 struct nfs4_fsinfo_arg args = {
3305 .fh = fhandle,
3306 .bitmask = server->attr_bitmask,
3307 };
3308 struct nfs4_fsinfo_res res = {
3309 .fsinfo = fsinfo,
3310 };
3311 struct rpc_message msg = {
3312 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3313 .rpc_argp = &args,
3314 .rpc_resp = &res,
3315 };
3316
3317 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3318}
3319
3320static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3321{
3322 struct nfs4_exception exception = { };
3323 int err;
3324
3325 do {
3326 err = nfs4_handle_exception(server,
3327 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3328 &exception);
3329 } while (exception.retry);
3330 return err;
3331}
3332
3333static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3334{
3335 nfs_fattr_init(fsinfo->fattr);
3336 return nfs4_do_fsinfo(server, fhandle, fsinfo);
3337}
3338
3339static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3340 struct nfs_pathconf *pathconf)
3341{
3342 struct nfs4_pathconf_arg args = {
3343 .fh = fhandle,
3344 .bitmask = server->attr_bitmask,
3345 };
3346 struct nfs4_pathconf_res res = {
3347 .pathconf = pathconf,
3348 };
3349 struct rpc_message msg = {
3350 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3351 .rpc_argp = &args,
3352 .rpc_resp = &res,
3353 };
3354
3355 /* None of the pathconf attributes are mandatory to implement */
3356 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3357 memset(pathconf, 0, sizeof(*pathconf));
3358 return 0;
3359 }
3360
3361 nfs_fattr_init(pathconf->fattr);
3362 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3363}
3364
3365static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3366 struct nfs_pathconf *pathconf)
3367{
3368 struct nfs4_exception exception = { };
3369 int err;
3370
3371 do {
3372 err = nfs4_handle_exception(server,
3373 _nfs4_proc_pathconf(server, fhandle, pathconf),
3374 &exception);
3375 } while (exception.retry);
3376 return err;
3377}
3378
3379void __nfs4_read_done_cb(struct nfs_read_data *data)
3380{
3381 nfs_invalidate_atime(data->header->inode);
3382}
3383
3384static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3385{
3386 struct nfs_server *server = NFS_SERVER(data->header->inode);
3387
3388 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3389 rpc_restart_call_prepare(task);
3390 return -EAGAIN;
3391 }
3392
3393 __nfs4_read_done_cb(data);
3394 if (task->tk_status > 0)
3395 renew_lease(server, data->timestamp);
3396 return 0;
3397}
3398
3399static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3400{
3401
3402 dprintk("--> %s\n", __func__);
3403
3404 if (!nfs4_sequence_done(task, &data->res.seq_res))
3405 return -EAGAIN;
3406
3407 return data->read_done_cb ? data->read_done_cb(task, data) :
3408 nfs4_read_done_cb(task, data);
3409}
3410
3411static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3412{
3413 data->timestamp = jiffies;
3414 data->read_done_cb = nfs4_read_done_cb;
3415 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3416 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3417}
3418
3419static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3420{
3421 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3422 &data->args.seq_args,
3423 &data->res.seq_res,
3424 task))
3425 return;
3426 rpc_call_start(task);
3427}
3428
3429static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3430{
3431 struct inode *inode = data->header->inode;
3432
3433 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3434 rpc_restart_call_prepare(task);
3435 return -EAGAIN;
3436 }
3437 if (task->tk_status >= 0) {
3438 renew_lease(NFS_SERVER(inode), data->timestamp);
3439 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3440 }
3441 return 0;
3442}
3443
3444static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3445{
3446 if (!nfs4_sequence_done(task, &data->res.seq_res))
3447 return -EAGAIN;
3448 return data->write_done_cb ? data->write_done_cb(task, data) :
3449 nfs4_write_done_cb(task, data);
3450}
3451
3452static
3453bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3454{
3455 const struct nfs_pgio_header *hdr = data->header;
3456
3457 /* Don't request attributes for pNFS or O_DIRECT writes */
3458 if (data->ds_clp != NULL || hdr->dreq != NULL)
3459 return false;
3460 /* Otherwise, request attributes if and only if we don't hold
3461 * a delegation
3462 */
3463 return nfs_have_delegation(hdr->inode, FMODE_READ) == 0;
3464}
3465
3466static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3467{
3468 struct nfs_server *server = NFS_SERVER(data->header->inode);
3469
3470 if (!nfs4_write_need_cache_consistency_data(data)) {
3471 data->args.bitmask = NULL;
3472 data->res.fattr = NULL;
3473 } else
3474 data->args.bitmask = server->cache_consistency_bitmask;
3475
3476 if (!data->write_done_cb)
3477 data->write_done_cb = nfs4_write_done_cb;
3478 data->res.server = server;
3479 data->timestamp = jiffies;
3480
3481 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3482 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3483}
3484
3485static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3486{
3487 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3488 &data->args.seq_args,
3489 &data->res.seq_res,
3490 task))
3491 return;
3492 rpc_call_start(task);
3493}
3494
3495static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3496{
3497 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3498 &data->args.seq_args,
3499 &data->res.seq_res,
3500 task))
3501 return;
3502 rpc_call_start(task);
3503}
3504
3505static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3506{
3507 struct inode *inode = data->inode;
3508
3509 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3510 rpc_restart_call_prepare(task);
3511 return -EAGAIN;
3512 }
3513 return 0;
3514}
3515
3516static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3517{
3518 if (!nfs4_sequence_done(task, &data->res.seq_res))
3519 return -EAGAIN;
3520 return data->commit_done_cb(task, data);
3521}
3522
3523static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3524{
3525 struct nfs_server *server = NFS_SERVER(data->inode);
3526
3527 if (data->commit_done_cb == NULL)
3528 data->commit_done_cb = nfs4_commit_done_cb;
3529 data->res.server = server;
3530 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3531 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3532}
3533
3534struct nfs4_renewdata {
3535 struct nfs_client *client;
3536 unsigned long timestamp;
3537};
3538
3539/*
3540 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3541 * standalone procedure for queueing an asynchronous RENEW.
3542 */
3543static void nfs4_renew_release(void *calldata)
3544{
3545 struct nfs4_renewdata *data = calldata;
3546 struct nfs_client *clp = data->client;
3547
3548 if (atomic_read(&clp->cl_count) > 1)
3549 nfs4_schedule_state_renewal(clp);
3550 nfs_put_client(clp);
3551 kfree(data);
3552}
3553
3554static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3555{
3556 struct nfs4_renewdata *data = calldata;
3557 struct nfs_client *clp = data->client;
3558 unsigned long timestamp = data->timestamp;
3559
3560 if (task->tk_status < 0) {
3561 /* Unless we're shutting down, schedule state recovery! */
3562 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3563 return;
3564 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3565 nfs4_schedule_lease_recovery(clp);
3566 return;
3567 }
3568 nfs4_schedule_path_down_recovery(clp);
3569 }
3570 do_renew_lease(clp, timestamp);
3571}
3572
3573static const struct rpc_call_ops nfs4_renew_ops = {
3574 .rpc_call_done = nfs4_renew_done,
3575 .rpc_release = nfs4_renew_release,
3576};
3577
3578static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3579{
3580 struct rpc_message msg = {
3581 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3582 .rpc_argp = clp,
3583 .rpc_cred = cred,
3584 };
3585 struct nfs4_renewdata *data;
3586
3587 if (renew_flags == 0)
3588 return 0;
3589 if (!atomic_inc_not_zero(&clp->cl_count))
3590 return -EIO;
3591 data = kmalloc(sizeof(*data), GFP_NOFS);
3592 if (data == NULL)
3593 return -ENOMEM;
3594 data->client = clp;
3595 data->timestamp = jiffies;
3596 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3597 &nfs4_renew_ops, data);
3598}
3599
3600static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3601{
3602 struct rpc_message msg = {
3603 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3604 .rpc_argp = clp,
3605 .rpc_cred = cred,
3606 };
3607 unsigned long now = jiffies;
3608 int status;
3609
3610 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3611 if (status < 0)
3612 return status;
3613 do_renew_lease(clp, now);
3614 return 0;
3615}
3616
3617static inline int nfs4_server_supports_acls(struct nfs_server *server)
3618{
3619 return (server->caps & NFS_CAP_ACLS)
3620 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3621 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3622}
3623
3624/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3625 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3626 * the stack.
3627 */
3628#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3629
3630static int buf_to_pages_noslab(const void *buf, size_t buflen,
3631 struct page **pages, unsigned int *pgbase)
3632{
3633 struct page *newpage, **spages;
3634 int rc = 0;
3635 size_t len;
3636 spages = pages;
3637
3638 do {
3639 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3640 newpage = alloc_page(GFP_KERNEL);
3641
3642 if (newpage == NULL)
3643 goto unwind;
3644 memcpy(page_address(newpage), buf, len);
3645 buf += len;
3646 buflen -= len;
3647 *pages++ = newpage;
3648 rc++;
3649 } while (buflen != 0);
3650
3651 return rc;
3652
3653unwind:
3654 for(; rc > 0; rc--)
3655 __free_page(spages[rc-1]);
3656 return -ENOMEM;
3657}
3658
3659struct nfs4_cached_acl {
3660 int cached;
3661 size_t len;
3662 char data[0];
3663};
3664
3665static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3666{
3667 struct nfs_inode *nfsi = NFS_I(inode);
3668
3669 spin_lock(&inode->i_lock);
3670 kfree(nfsi->nfs4_acl);
3671 nfsi->nfs4_acl = acl;
3672 spin_unlock(&inode->i_lock);
3673}
3674
3675static void nfs4_zap_acl_attr(struct inode *inode)
3676{
3677 nfs4_set_cached_acl(inode, NULL);
3678}
3679
3680static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3681{
3682 struct nfs_inode *nfsi = NFS_I(inode);
3683 struct nfs4_cached_acl *acl;
3684 int ret = -ENOENT;
3685
3686 spin_lock(&inode->i_lock);
3687 acl = nfsi->nfs4_acl;
3688 if (acl == NULL)
3689 goto out;
3690 if (buf == NULL) /* user is just asking for length */
3691 goto out_len;
3692 if (acl->cached == 0)
3693 goto out;
3694 ret = -ERANGE; /* see getxattr(2) man page */
3695 if (acl->len > buflen)
3696 goto out;
3697 memcpy(buf, acl->data, acl->len);
3698out_len:
3699 ret = acl->len;
3700out:
3701 spin_unlock(&inode->i_lock);
3702 return ret;
3703}
3704
3705static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3706{
3707 struct nfs4_cached_acl *acl;
3708
3709 if (pages && acl_len <= PAGE_SIZE) {
3710 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3711 if (acl == NULL)
3712 goto out;
3713 acl->cached = 1;
3714 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3715 } else {
3716 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3717 if (acl == NULL)
3718 goto out;
3719 acl->cached = 0;
3720 }
3721 acl->len = acl_len;
3722out:
3723 nfs4_set_cached_acl(inode, acl);
3724}
3725
3726/*
3727 * The getxattr API returns the required buffer length when called with a
3728 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3729 * the required buf. On a NULL buf, we send a page of data to the server
3730 * guessing that the ACL request can be serviced by a page. If so, we cache
3731 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3732 * the cache. If not so, we throw away the page, and cache the required
3733 * length. The next getxattr call will then produce another round trip to
3734 * the server, this time with the input buf of the required size.
3735 */
3736static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3737{
3738 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3739 struct nfs_getaclargs args = {
3740 .fh = NFS_FH(inode),
3741 .acl_pages = pages,
3742 .acl_len = buflen,
3743 };
3744 struct nfs_getaclres res = {
3745 .acl_len = buflen,
3746 };
3747 struct rpc_message msg = {
3748 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3749 .rpc_argp = &args,
3750 .rpc_resp = &res,
3751 };
3752 int ret = -ENOMEM, npages, i, acl_len = 0;
3753
3754 npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3755 /* As long as we're doing a round trip to the server anyway,
3756 * let's be prepared for a page of acl data. */
3757 if (npages == 0)
3758 npages = 1;
3759
3760 /* Add an extra page to handle the bitmap returned */
3761 npages++;
3762
3763 for (i = 0; i < npages; i++) {
3764 pages[i] = alloc_page(GFP_KERNEL);
3765 if (!pages[i])
3766 goto out_free;
3767 }
3768
3769 /* for decoding across pages */
3770 res.acl_scratch = alloc_page(GFP_KERNEL);
3771 if (!res.acl_scratch)
3772 goto out_free;
3773
3774 args.acl_len = npages * PAGE_SIZE;
3775 args.acl_pgbase = 0;
3776
3777 /* Let decode_getfacl know not to fail if the ACL data is larger than
3778 * the page we send as a guess */
3779 if (buf == NULL)
3780 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3781
3782 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
3783 __func__, buf, buflen, npages, args.acl_len);
3784 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3785 &msg, &args.seq_args, &res.seq_res, 0);
3786 if (ret)
3787 goto out_free;
3788
3789 acl_len = res.acl_len - res.acl_data_offset;
3790 if (acl_len > args.acl_len)
3791 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3792 else
3793 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3794 acl_len);
3795 if (buf) {
3796 ret = -ERANGE;
3797 if (acl_len > buflen)
3798 goto out_free;
3799 _copy_from_pages(buf, pages, res.acl_data_offset,
3800 acl_len);
3801 }
3802 ret = acl_len;
3803out_free:
3804 for (i = 0; i < npages; i++)
3805 if (pages[i])
3806 __free_page(pages[i]);
3807 if (res.acl_scratch)
3808 __free_page(res.acl_scratch);
3809 return ret;
3810}
3811
3812static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3813{
3814 struct nfs4_exception exception = { };
3815 ssize_t ret;
3816 do {
3817 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3818 if (ret >= 0)
3819 break;
3820 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3821 } while (exception.retry);
3822 return ret;
3823}
3824
3825static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3826{
3827 struct nfs_server *server = NFS_SERVER(inode);
3828 int ret;
3829
3830 if (!nfs4_server_supports_acls(server))
3831 return -EOPNOTSUPP;
3832 ret = nfs_revalidate_inode(server, inode);
3833 if (ret < 0)
3834 return ret;
3835 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3836 nfs_zap_acl_cache(inode);
3837 ret = nfs4_read_cached_acl(inode, buf, buflen);
3838 if (ret != -ENOENT)
3839 /* -ENOENT is returned if there is no ACL or if there is an ACL
3840 * but no cached acl data, just the acl length */
3841 return ret;
3842 return nfs4_get_acl_uncached(inode, buf, buflen);
3843}
3844
3845static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3846{
3847 struct nfs_server *server = NFS_SERVER(inode);
3848 struct page *pages[NFS4ACL_MAXPAGES];
3849 struct nfs_setaclargs arg = {
3850 .fh = NFS_FH(inode),
3851 .acl_pages = pages,
3852 .acl_len = buflen,
3853 };
3854 struct nfs_setaclres res;
3855 struct rpc_message msg = {
3856 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3857 .rpc_argp = &arg,
3858 .rpc_resp = &res,
3859 };
3860 int ret, i;
3861
3862 if (!nfs4_server_supports_acls(server))
3863 return -EOPNOTSUPP;
3864 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3865 if (i < 0)
3866 return i;
3867 nfs_inode_return_delegation(inode);
3868 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3869
3870 /*
3871 * Free each page after tx, so the only ref left is
3872 * held by the network stack
3873 */
3874 for (; i > 0; i--)
3875 put_page(pages[i-1]);
3876
3877 /*
3878 * Acl update can result in inode attribute update.
3879 * so mark the attribute cache invalid.
3880 */
3881 spin_lock(&inode->i_lock);
3882 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3883 spin_unlock(&inode->i_lock);
3884 nfs_access_zap_cache(inode);
3885 nfs_zap_acl_cache(inode);
3886 return ret;
3887}
3888
3889static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3890{
3891 struct nfs4_exception exception = { };
3892 int err;
3893 do {
3894 err = nfs4_handle_exception(NFS_SERVER(inode),
3895 __nfs4_proc_set_acl(inode, buf, buflen),
3896 &exception);
3897 } while (exception.retry);
3898 return err;
3899}
3900
3901static int
3902nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3903{
3904 struct nfs_client *clp = server->nfs_client;
3905
3906 if (task->tk_status >= 0)
3907 return 0;
3908 switch(task->tk_status) {
3909 case -NFS4ERR_DELEG_REVOKED:
3910 case -NFS4ERR_ADMIN_REVOKED:
3911 case -NFS4ERR_BAD_STATEID:
3912 if (state == NULL)
3913 break;
3914 nfs_remove_bad_delegation(state->inode);
3915 case -NFS4ERR_OPENMODE:
3916 if (state == NULL)
3917 break;
3918 nfs4_schedule_stateid_recovery(server, state);
3919 goto wait_on_recovery;
3920 case -NFS4ERR_EXPIRED:
3921 if (state != NULL)
3922 nfs4_schedule_stateid_recovery(server, state);
3923 case -NFS4ERR_STALE_STATEID:
3924 case -NFS4ERR_STALE_CLIENTID:
3925 nfs4_schedule_lease_recovery(clp);
3926 goto wait_on_recovery;
3927#if defined(CONFIG_NFS_V4_1)
3928 case -NFS4ERR_BADSESSION:
3929 case -NFS4ERR_BADSLOT:
3930 case -NFS4ERR_BAD_HIGH_SLOT:
3931 case -NFS4ERR_DEADSESSION:
3932 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3933 case -NFS4ERR_SEQ_FALSE_RETRY:
3934 case -NFS4ERR_SEQ_MISORDERED:
3935 dprintk("%s ERROR %d, Reset session\n", __func__,
3936 task->tk_status);
3937 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3938 task->tk_status = 0;
3939 return -EAGAIN;
3940#endif /* CONFIG_NFS_V4_1 */
3941 case -NFS4ERR_DELAY:
3942 nfs_inc_server_stats(server, NFSIOS_DELAY);
3943 case -NFS4ERR_GRACE:
3944 case -EKEYEXPIRED:
3945 rpc_delay(task, NFS4_POLL_RETRY_MAX);
3946 task->tk_status = 0;
3947 return -EAGAIN;
3948 case -NFS4ERR_RETRY_UNCACHED_REP:
3949 case -NFS4ERR_OLD_STATEID:
3950 task->tk_status = 0;
3951 return -EAGAIN;
3952 }
3953 task->tk_status = nfs4_map_errors(task->tk_status);
3954 return 0;
3955wait_on_recovery:
3956 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3957 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3958 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3959 task->tk_status = 0;
3960 return -EAGAIN;
3961}
3962
3963static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3964 nfs4_verifier *bootverf)
3965{
3966 __be32 verf[2];
3967
3968 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3969 /* An impossible timestamp guarantees this value
3970 * will never match a generated boot time. */
3971 verf[0] = 0;
3972 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3973 } else {
3974 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3975 verf[0] = (__be32)nn->boot_time.tv_sec;
3976 verf[1] = (__be32)nn->boot_time.tv_nsec;
3977 }
3978 memcpy(bootverf->data, verf, sizeof(bootverf->data));
3979}
3980
3981int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3982 unsigned short port, struct rpc_cred *cred,
3983 struct nfs4_setclientid_res *res)
3984{
3985 nfs4_verifier sc_verifier;
3986 struct nfs4_setclientid setclientid = {
3987 .sc_verifier = &sc_verifier,
3988 .sc_prog = program,
3989 .sc_cb_ident = clp->cl_cb_ident,
3990 };
3991 struct rpc_message msg = {
3992 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3993 .rpc_argp = &setclientid,
3994 .rpc_resp = res,
3995 .rpc_cred = cred,
3996 };
3997 int loop = 0;
3998 int status;
3999
4000 nfs4_init_boot_verifier(clp, &sc_verifier);
4001
4002 for(;;) {
4003 rcu_read_lock();
4004 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
4005 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
4006 clp->cl_ipaddr,
4007 rpc_peeraddr2str(clp->cl_rpcclient,
4008 RPC_DISPLAY_ADDR),
4009 rpc_peeraddr2str(clp->cl_rpcclient,
4010 RPC_DISPLAY_PROTO),
4011 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4012 clp->cl_id_uniquifier);
4013 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4014 sizeof(setclientid.sc_netid),
4015 rpc_peeraddr2str(clp->cl_rpcclient,
4016 RPC_DISPLAY_NETID));
4017 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4018 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4019 clp->cl_ipaddr, port >> 8, port & 255);
4020 rcu_read_unlock();
4021
4022 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4023 if (status != -NFS4ERR_CLID_INUSE)
4024 break;
4025 if (loop != 0) {
4026 ++clp->cl_id_uniquifier;
4027 break;
4028 }
4029 ++loop;
4030 ssleep(clp->cl_lease_time / HZ + 1);
4031 }
4032 return status;
4033}
4034
4035int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4036 struct nfs4_setclientid_res *arg,
4037 struct rpc_cred *cred)
4038{
4039 struct nfs_fsinfo fsinfo;
4040 struct rpc_message msg = {
4041 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4042 .rpc_argp = arg,
4043 .rpc_resp = &fsinfo,
4044 .rpc_cred = cred,
4045 };
4046 unsigned long now;
4047 int status;
4048
4049 now = jiffies;
4050 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4051 if (status == 0) {
4052 spin_lock(&clp->cl_lock);
4053 clp->cl_lease_time = fsinfo.lease_time * HZ;
4054 clp->cl_last_renewal = now;
4055 spin_unlock(&clp->cl_lock);
4056 }
4057 return status;
4058}
4059
4060struct nfs4_delegreturndata {
4061 struct nfs4_delegreturnargs args;
4062 struct nfs4_delegreturnres res;
4063 struct nfs_fh fh;
4064 nfs4_stateid stateid;
4065 unsigned long timestamp;
4066 struct nfs_fattr fattr;
4067 int rpc_status;
4068};
4069
4070static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4071{
4072 struct nfs4_delegreturndata *data = calldata;
4073
4074 if (!nfs4_sequence_done(task, &data->res.seq_res))
4075 return;
4076
4077 switch (task->tk_status) {
4078 case -NFS4ERR_STALE_STATEID:
4079 case -NFS4ERR_EXPIRED:
4080 case 0:
4081 renew_lease(data->res.server, data->timestamp);
4082 break;
4083 default:
4084 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4085 -EAGAIN) {
4086 rpc_restart_call_prepare(task);
4087 return;
4088 }
4089 }
4090 data->rpc_status = task->tk_status;
4091}
4092
4093static void nfs4_delegreturn_release(void *calldata)
4094{
4095 kfree(calldata);
4096}
4097
4098#if defined(CONFIG_NFS_V4_1)
4099static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4100{
4101 struct nfs4_delegreturndata *d_data;
4102
4103 d_data = (struct nfs4_delegreturndata *)data;
4104
4105 if (nfs4_setup_sequence(d_data->res.server,
4106 &d_data->args.seq_args,
4107 &d_data->res.seq_res, task))
4108 return;
4109 rpc_call_start(task);
4110}
4111#endif /* CONFIG_NFS_V4_1 */
4112
4113static const struct rpc_call_ops nfs4_delegreturn_ops = {
4114#if defined(CONFIG_NFS_V4_1)
4115 .rpc_call_prepare = nfs4_delegreturn_prepare,
4116#endif /* CONFIG_NFS_V4_1 */
4117 .rpc_call_done = nfs4_delegreturn_done,
4118 .rpc_release = nfs4_delegreturn_release,
4119};
4120
4121static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4122{
4123 struct nfs4_delegreturndata *data;
4124 struct nfs_server *server = NFS_SERVER(inode);
4125 struct rpc_task *task;
4126 struct rpc_message msg = {
4127 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4128 .rpc_cred = cred,
4129 };
4130 struct rpc_task_setup task_setup_data = {
4131 .rpc_client = server->client,
4132 .rpc_message = &msg,
4133 .callback_ops = &nfs4_delegreturn_ops,
4134 .flags = RPC_TASK_ASYNC,
4135 };
4136 int status = 0;
4137
4138 data = kzalloc(sizeof(*data), GFP_NOFS);
4139 if (data == NULL)
4140 return -ENOMEM;
4141 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4142 data->args.fhandle = &data->fh;
4143 data->args.stateid = &data->stateid;
4144 data->args.bitmask = server->cache_consistency_bitmask;
4145 nfs_copy_fh(&data->fh, NFS_FH(inode));
4146 nfs4_stateid_copy(&data->stateid, stateid);
4147 data->res.fattr = &data->fattr;
4148 data->res.server = server;
4149 nfs_fattr_init(data->res.fattr);
4150 data->timestamp = jiffies;
4151 data->rpc_status = 0;
4152
4153 task_setup_data.callback_data = data;
4154 msg.rpc_argp = &data->args;
4155 msg.rpc_resp = &data->res;
4156 task = rpc_run_task(&task_setup_data);
4157 if (IS_ERR(task))
4158 return PTR_ERR(task);
4159 if (!issync)
4160 goto out;
4161 status = nfs4_wait_for_completion_rpc_task(task);
4162 if (status != 0)
4163 goto out;
4164 status = data->rpc_status;
4165 if (status == 0)
4166 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4167 else
4168 nfs_refresh_inode(inode, &data->fattr);
4169out:
4170 rpc_put_task(task);
4171 return status;
4172}
4173
4174int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4175{
4176 struct nfs_server *server = NFS_SERVER(inode);
4177 struct nfs4_exception exception = { };
4178 int err;
4179 do {
4180 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4181 switch (err) {
4182 case -NFS4ERR_STALE_STATEID:
4183 case -NFS4ERR_EXPIRED:
4184 case 0:
4185 return 0;
4186 }
4187 err = nfs4_handle_exception(server, err, &exception);
4188 } while (exception.retry);
4189 return err;
4190}
4191
4192#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4193#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4194
4195/*
4196 * sleep, with exponential backoff, and retry the LOCK operation.
4197 */
4198static unsigned long
4199nfs4_set_lock_task_retry(unsigned long timeout)
4200{
4201 freezable_schedule_timeout_killable(timeout);
4202 timeout <<= 1;
4203 if (timeout > NFS4_LOCK_MAXTIMEOUT)
4204 return NFS4_LOCK_MAXTIMEOUT;
4205 return timeout;
4206}
4207
4208static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4209{
4210 struct inode *inode = state->inode;
4211 struct nfs_server *server = NFS_SERVER(inode);
4212 struct nfs_client *clp = server->nfs_client;
4213 struct nfs_lockt_args arg = {
4214 .fh = NFS_FH(inode),
4215 .fl = request,
4216 };
4217 struct nfs_lockt_res res = {
4218 .denied = request,
4219 };
4220 struct rpc_message msg = {
4221 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4222 .rpc_argp = &arg,
4223 .rpc_resp = &res,
4224 .rpc_cred = state->owner->so_cred,
4225 };
4226 struct nfs4_lock_state *lsp;
4227 int status;
4228
4229 arg.lock_owner.clientid = clp->cl_clientid;
4230 status = nfs4_set_lock_state(state, request);
4231 if (status != 0)
4232 goto out;
4233 lsp = request->fl_u.nfs4_fl.owner;
4234 arg.lock_owner.id = lsp->ls_seqid.owner_id;
4235 arg.lock_owner.s_dev = server->s_dev;
4236 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4237 switch (status) {
4238 case 0:
4239 request->fl_type = F_UNLCK;
4240 break;
4241 case -NFS4ERR_DENIED:
4242 status = 0;
4243 }
4244 request->fl_ops->fl_release_private(request);
4245out:
4246 return status;
4247}
4248
4249static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4250{
4251 struct nfs4_exception exception = { };
4252 int err;
4253
4254 do {
4255 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4256 _nfs4_proc_getlk(state, cmd, request),
4257 &exception);
4258 } while (exception.retry);
4259 return err;
4260}
4261
4262static int do_vfs_lock(struct file *file, struct file_lock *fl)
4263{
4264 int res = 0;
4265 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4266 case FL_POSIX:
4267 res = posix_lock_file_wait(file, fl);
4268 break;
4269 case FL_FLOCK:
4270 res = flock_lock_file_wait(file, fl);
4271 break;
4272 default:
4273 BUG();
4274 }
4275 return res;
4276}
4277
4278struct nfs4_unlockdata {
4279 struct nfs_locku_args arg;
4280 struct nfs_locku_res res;
4281 struct nfs4_lock_state *lsp;
4282 struct nfs_open_context *ctx;
4283 struct file_lock fl;
4284 const struct nfs_server *server;
4285 unsigned long timestamp;
4286};
4287
4288static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4289 struct nfs_open_context *ctx,
4290 struct nfs4_lock_state *lsp,
4291 struct nfs_seqid *seqid)
4292{
4293 struct nfs4_unlockdata *p;
4294 struct inode *inode = lsp->ls_state->inode;
4295
4296 p = kzalloc(sizeof(*p), GFP_NOFS);
4297 if (p == NULL)
4298 return NULL;
4299 p->arg.fh = NFS_FH(inode);
4300 p->arg.fl = &p->fl;
4301 p->arg.seqid = seqid;
4302 p->res.seqid = seqid;
4303 p->arg.stateid = &lsp->ls_stateid;
4304 p->lsp = lsp;
4305 atomic_inc(&lsp->ls_count);
4306 /* Ensure we don't close file until we're done freeing locks! */
4307 p->ctx = get_nfs_open_context(ctx);
4308 memcpy(&p->fl, fl, sizeof(p->fl));
4309 p->server = NFS_SERVER(inode);
4310 return p;
4311}
4312
4313static void nfs4_locku_release_calldata(void *data)
4314{
4315 struct nfs4_unlockdata *calldata = data;
4316 nfs_free_seqid(calldata->arg.seqid);
4317 nfs4_put_lock_state(calldata->lsp);
4318 put_nfs_open_context(calldata->ctx);
4319 kfree(calldata);
4320}
4321
4322static void nfs4_locku_done(struct rpc_task *task, void *data)
4323{
4324 struct nfs4_unlockdata *calldata = data;
4325
4326 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4327 return;
4328 switch (task->tk_status) {
4329 case 0:
4330 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4331 &calldata->res.stateid);
4332 renew_lease(calldata->server, calldata->timestamp);
4333 break;
4334 case -NFS4ERR_BAD_STATEID:
4335 case -NFS4ERR_OLD_STATEID:
4336 case -NFS4ERR_STALE_STATEID:
4337 case -NFS4ERR_EXPIRED:
4338 break;
4339 default:
4340 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4341 rpc_restart_call_prepare(task);
4342 }
4343}
4344
4345static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4346{
4347 struct nfs4_unlockdata *calldata = data;
4348
4349 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4350 return;
4351 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4352 /* Note: exit _without_ running nfs4_locku_done */
4353 task->tk_action = NULL;
4354 return;
4355 }
4356 calldata->timestamp = jiffies;
4357 if (nfs4_setup_sequence(calldata->server,
4358 &calldata->arg.seq_args,
4359 &calldata->res.seq_res, task))
4360 return;
4361 rpc_call_start(task);
4362}
4363
4364static const struct rpc_call_ops nfs4_locku_ops = {
4365 .rpc_call_prepare = nfs4_locku_prepare,
4366 .rpc_call_done = nfs4_locku_done,
4367 .rpc_release = nfs4_locku_release_calldata,
4368};
4369
4370static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4371 struct nfs_open_context *ctx,
4372 struct nfs4_lock_state *lsp,
4373 struct nfs_seqid *seqid)
4374{
4375 struct nfs4_unlockdata *data;
4376 struct rpc_message msg = {
4377 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4378 .rpc_cred = ctx->cred,
4379 };
4380 struct rpc_task_setup task_setup_data = {
4381 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4382 .rpc_message = &msg,
4383 .callback_ops = &nfs4_locku_ops,
4384 .workqueue = nfsiod_workqueue,
4385 .flags = RPC_TASK_ASYNC,
4386 };
4387
4388 /* Ensure this is an unlock - when canceling a lock, the
4389 * canceled lock is passed in, and it won't be an unlock.
4390 */
4391 fl->fl_type = F_UNLCK;
4392
4393 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4394 if (data == NULL) {
4395 nfs_free_seqid(seqid);
4396 return ERR_PTR(-ENOMEM);
4397 }
4398
4399 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4400 msg.rpc_argp = &data->arg;
4401 msg.rpc_resp = &data->res;
4402 task_setup_data.callback_data = data;
4403 return rpc_run_task(&task_setup_data);
4404}
4405
4406static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4407{
4408 struct nfs_inode *nfsi = NFS_I(state->inode);
4409 struct nfs_seqid *seqid;
4410 struct nfs4_lock_state *lsp;
4411 struct rpc_task *task;
4412 int status = 0;
4413 unsigned char fl_flags = request->fl_flags;
4414
4415 status = nfs4_set_lock_state(state, request);
4416 /* Unlock _before_ we do the RPC call */
4417 request->fl_flags |= FL_EXISTS;
4418 down_read(&nfsi->rwsem);
4419 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4420 up_read(&nfsi->rwsem);
4421 goto out;
4422 }
4423 up_read(&nfsi->rwsem);
4424 if (status != 0)
4425 goto out;
4426 /* Is this a delegated lock? */
4427 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4428 goto out;
4429 lsp = request->fl_u.nfs4_fl.owner;
4430 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4431 status = -ENOMEM;
4432 if (seqid == NULL)
4433 goto out;
4434 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4435 status = PTR_ERR(task);
4436 if (IS_ERR(task))
4437 goto out;
4438 status = nfs4_wait_for_completion_rpc_task(task);
4439 rpc_put_task(task);
4440out:
4441 request->fl_flags = fl_flags;
4442 return status;
4443}
4444
4445struct nfs4_lockdata {
4446 struct nfs_lock_args arg;
4447 struct nfs_lock_res res;
4448 struct nfs4_lock_state *lsp;
4449 struct nfs_open_context *ctx;
4450 struct file_lock fl;
4451 unsigned long timestamp;
4452 int rpc_status;
4453 int cancelled;
4454 struct nfs_server *server;
4455};
4456
4457static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4458 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4459 gfp_t gfp_mask)
4460{
4461 struct nfs4_lockdata *p;
4462 struct inode *inode = lsp->ls_state->inode;
4463 struct nfs_server *server = NFS_SERVER(inode);
4464
4465 p = kzalloc(sizeof(*p), gfp_mask);
4466 if (p == NULL)
4467 return NULL;
4468
4469 p->arg.fh = NFS_FH(inode);
4470 p->arg.fl = &p->fl;
4471 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4472 if (p->arg.open_seqid == NULL)
4473 goto out_free;
4474 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4475 if (p->arg.lock_seqid == NULL)
4476 goto out_free_seqid;
4477 p->arg.lock_stateid = &lsp->ls_stateid;
4478 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4479 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4480 p->arg.lock_owner.s_dev = server->s_dev;
4481 p->res.lock_seqid = p->arg.lock_seqid;
4482 p->lsp = lsp;
4483 p->server = server;
4484 atomic_inc(&lsp->ls_count);
4485 p->ctx = get_nfs_open_context(ctx);
4486 memcpy(&p->fl, fl, sizeof(p->fl));
4487 return p;
4488out_free_seqid:
4489 nfs_free_seqid(p->arg.open_seqid);
4490out_free:
4491 kfree(p);
4492 return NULL;
4493}
4494
4495static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4496{
4497 struct nfs4_lockdata *data = calldata;
4498 struct nfs4_state *state = data->lsp->ls_state;
4499
4500 dprintk("%s: begin!\n", __func__);
4501 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4502 return;
4503 /* Do we need to do an open_to_lock_owner? */
4504 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4505 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4506 return;
4507 data->arg.open_stateid = &state->stateid;
4508 data->arg.new_lock_owner = 1;
4509 data->res.open_seqid = data->arg.open_seqid;
4510 } else
4511 data->arg.new_lock_owner = 0;
4512 data->timestamp = jiffies;
4513 if (nfs4_setup_sequence(data->server,
4514 &data->arg.seq_args,
4515 &data->res.seq_res, task))
4516 return;
4517 rpc_call_start(task);
4518 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4519}
4520
4521static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4522{
4523 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4524 nfs4_lock_prepare(task, calldata);
4525}
4526
4527static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4528{
4529 struct nfs4_lockdata *data = calldata;
4530
4531 dprintk("%s: begin!\n", __func__);
4532
4533 if (!nfs4_sequence_done(task, &data->res.seq_res))
4534 return;
4535
4536 data->rpc_status = task->tk_status;
4537 if (data->arg.new_lock_owner != 0) {
4538 if (data->rpc_status == 0)
4539 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4540 else
4541 goto out;
4542 }
4543 if (data->rpc_status == 0) {
4544 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4545 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4546 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4547 }
4548out:
4549 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4550}
4551
4552static void nfs4_lock_release(void *calldata)
4553{
4554 struct nfs4_lockdata *data = calldata;
4555
4556 dprintk("%s: begin!\n", __func__);
4557 nfs_free_seqid(data->arg.open_seqid);
4558 if (data->cancelled != 0) {
4559 struct rpc_task *task;
4560 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4561 data->arg.lock_seqid);
4562 if (!IS_ERR(task))
4563 rpc_put_task_async(task);
4564 dprintk("%s: cancelling lock!\n", __func__);
4565 } else
4566 nfs_free_seqid(data->arg.lock_seqid);
4567 nfs4_put_lock_state(data->lsp);
4568 put_nfs_open_context(data->ctx);
4569 kfree(data);
4570 dprintk("%s: done!\n", __func__);
4571}
4572
4573static const struct rpc_call_ops nfs4_lock_ops = {
4574 .rpc_call_prepare = nfs4_lock_prepare,
4575 .rpc_call_done = nfs4_lock_done,
4576 .rpc_release = nfs4_lock_release,
4577};
4578
4579static const struct rpc_call_ops nfs4_recover_lock_ops = {
4580 .rpc_call_prepare = nfs4_recover_lock_prepare,
4581 .rpc_call_done = nfs4_lock_done,
4582 .rpc_release = nfs4_lock_release,
4583};
4584
4585static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4586{
4587 switch (error) {
4588 case -NFS4ERR_ADMIN_REVOKED:
4589 case -NFS4ERR_BAD_STATEID:
4590 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4591 if (new_lock_owner != 0 ||
4592 (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4593 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4594 break;
4595 case -NFS4ERR_STALE_STATEID:
4596 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4597 case -NFS4ERR_EXPIRED:
4598 nfs4_schedule_lease_recovery(server->nfs_client);
4599 };
4600}
4601
4602static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4603{
4604 struct nfs4_lockdata *data;
4605 struct rpc_task *task;
4606 struct rpc_message msg = {
4607 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4608 .rpc_cred = state->owner->so_cred,
4609 };
4610 struct rpc_task_setup task_setup_data = {
4611 .rpc_client = NFS_CLIENT(state->inode),
4612 .rpc_message = &msg,
4613 .callback_ops = &nfs4_lock_ops,
4614 .workqueue = nfsiod_workqueue,
4615 .flags = RPC_TASK_ASYNC,
4616 };
4617 int ret;
4618
4619 dprintk("%s: begin!\n", __func__);
4620 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4621 fl->fl_u.nfs4_fl.owner,
4622 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4623 if (data == NULL)
4624 return -ENOMEM;
4625 if (IS_SETLKW(cmd))
4626 data->arg.block = 1;
4627 if (recovery_type > NFS_LOCK_NEW) {
4628 if (recovery_type == NFS_LOCK_RECLAIM)
4629 data->arg.reclaim = NFS_LOCK_RECLAIM;
4630 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4631 }
4632 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4633 msg.rpc_argp = &data->arg;
4634 msg.rpc_resp = &data->res;
4635 task_setup_data.callback_data = data;
4636 task = rpc_run_task(&task_setup_data);
4637 if (IS_ERR(task))
4638 return PTR_ERR(task);
4639 ret = nfs4_wait_for_completion_rpc_task(task);
4640 if (ret == 0) {
4641 ret = data->rpc_status;
4642 if (ret)
4643 nfs4_handle_setlk_error(data->server, data->lsp,
4644 data->arg.new_lock_owner, ret);
4645 } else
4646 data->cancelled = 1;
4647 rpc_put_task(task);
4648 dprintk("%s: done, ret = %d!\n", __func__, ret);
4649 return ret;
4650}
4651
4652static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4653{
4654 struct nfs_server *server = NFS_SERVER(state->inode);
4655 struct nfs4_exception exception = {
4656 .inode = state->inode,
4657 };
4658 int err;
4659
4660 do {
4661 /* Cache the lock if possible... */
4662 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4663 return 0;
4664 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4665 if (err != -NFS4ERR_DELAY)
4666 break;
4667 nfs4_handle_exception(server, err, &exception);
4668 } while (exception.retry);
4669 return err;
4670}
4671
4672static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4673{
4674 struct nfs_server *server = NFS_SERVER(state->inode);
4675 struct nfs4_exception exception = {
4676 .inode = state->inode,
4677 };
4678 int err;
4679
4680 err = nfs4_set_lock_state(state, request);
4681 if (err != 0)
4682 return err;
4683 do {
4684 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4685 return 0;
4686 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4687 switch (err) {
4688 default:
4689 goto out;
4690 case -NFS4ERR_GRACE:
4691 case -NFS4ERR_DELAY:
4692 nfs4_handle_exception(server, err, &exception);
4693 err = 0;
4694 }
4695 } while (exception.retry);
4696out:
4697 return err;
4698}
4699
4700#if defined(CONFIG_NFS_V4_1)
4701static int nfs41_check_expired_locks(struct nfs4_state *state)
4702{
4703 int status, ret = NFS_OK;
4704 struct nfs4_lock_state *lsp;
4705 struct nfs_server *server = NFS_SERVER(state->inode);
4706
4707 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4708 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4709 status = nfs41_test_stateid(server, &lsp->ls_stateid);
4710 if (status != NFS_OK) {
4711 nfs41_free_stateid(server, &lsp->ls_stateid);
4712 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4713 ret = status;
4714 }
4715 }
4716 };
4717
4718 return ret;
4719}
4720
4721static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4722{
4723 int status = NFS_OK;
4724
4725 if (test_bit(LK_STATE_IN_USE, &state->flags))
4726 status = nfs41_check_expired_locks(state);
4727 if (status == NFS_OK)
4728 return status;
4729 return nfs4_lock_expired(state, request);
4730}
4731#endif
4732
4733static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4734{
4735 struct nfs_inode *nfsi = NFS_I(state->inode);
4736 unsigned char fl_flags = request->fl_flags;
4737 int status = -ENOLCK;
4738
4739 if ((fl_flags & FL_POSIX) &&
4740 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4741 goto out;
4742 /* Is this a delegated open? */
4743 status = nfs4_set_lock_state(state, request);
4744 if (status != 0)
4745 goto out;
4746 request->fl_flags |= FL_ACCESS;
4747 status = do_vfs_lock(request->fl_file, request);
4748 if (status < 0)
4749 goto out;
4750 down_read(&nfsi->rwsem);
4751 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4752 /* Yes: cache locks! */
4753 /* ...but avoid races with delegation recall... */
4754 request->fl_flags = fl_flags & ~FL_SLEEP;
4755 status = do_vfs_lock(request->fl_file, request);
4756 goto out_unlock;
4757 }
4758 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4759 if (status != 0)
4760 goto out_unlock;
4761 /* Note: we always want to sleep here! */
4762 request->fl_flags = fl_flags | FL_SLEEP;
4763 if (do_vfs_lock(request->fl_file, request) < 0)
4764 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4765 "manager!\n", __func__);
4766out_unlock:
4767 up_read(&nfsi->rwsem);
4768out:
4769 request->fl_flags = fl_flags;
4770 return status;
4771}
4772
4773static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4774{
4775 struct nfs4_exception exception = {
4776 .state = state,
4777 .inode = state->inode,
4778 };
4779 int err;
4780
4781 do {
4782 err = _nfs4_proc_setlk(state, cmd, request);
4783 if (err == -NFS4ERR_DENIED)
4784 err = -EAGAIN;
4785 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4786 err, &exception);
4787 } while (exception.retry);
4788 return err;
4789}
4790
4791static int
4792nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4793{
4794 struct nfs_open_context *ctx;
4795 struct nfs4_state *state;
4796 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4797 int status;
4798
4799 /* verify open state */
4800 ctx = nfs_file_open_context(filp);
4801 state = ctx->state;
4802
4803 if (request->fl_start < 0 || request->fl_end < 0)
4804 return -EINVAL;
4805
4806 if (IS_GETLK(cmd)) {
4807 if (state != NULL)
4808 return nfs4_proc_getlk(state, F_GETLK, request);
4809 return 0;
4810 }
4811
4812 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4813 return -EINVAL;
4814
4815 if (request->fl_type == F_UNLCK) {
4816 if (state != NULL)
4817 return nfs4_proc_unlck(state, cmd, request);
4818 return 0;
4819 }
4820
4821 if (state == NULL)
4822 return -ENOLCK;
4823 /*
4824 * Don't rely on the VFS having checked the file open mode,
4825 * since it won't do this for flock() locks.
4826 */
4827 switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4828 case F_RDLCK:
4829 if (!(filp->f_mode & FMODE_READ))
4830 return -EBADF;
4831 break;
4832 case F_WRLCK:
4833 if (!(filp->f_mode & FMODE_WRITE))
4834 return -EBADF;
4835 }
4836
4837 do {
4838 status = nfs4_proc_setlk(state, cmd, request);
4839 if ((status != -EAGAIN) || IS_SETLK(cmd))
4840 break;
4841 timeout = nfs4_set_lock_task_retry(timeout);
4842 status = -ERESTARTSYS;
4843 if (signalled())
4844 break;
4845 } while(status < 0);
4846 return status;
4847}
4848
4849int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4850{
4851 struct nfs_server *server = NFS_SERVER(state->inode);
4852 struct nfs4_exception exception = { };
4853 int err;
4854
4855 err = nfs4_set_lock_state(state, fl);
4856 if (err != 0)
4857 goto out;
4858 do {
4859 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4860 switch (err) {
4861 default:
4862 printk(KERN_ERR "NFS: %s: unhandled error "
4863 "%d.\n", __func__, err);
4864 case 0:
4865 case -ESTALE:
4866 goto out;
4867 case -NFS4ERR_EXPIRED:
4868 nfs4_schedule_stateid_recovery(server, state);
4869 case -NFS4ERR_STALE_CLIENTID:
4870 case -NFS4ERR_STALE_STATEID:
4871 nfs4_schedule_lease_recovery(server->nfs_client);
4872 goto out;
4873 case -NFS4ERR_BADSESSION:
4874 case -NFS4ERR_BADSLOT:
4875 case -NFS4ERR_BAD_HIGH_SLOT:
4876 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4877 case -NFS4ERR_DEADSESSION:
4878 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4879 goto out;
4880 case -ERESTARTSYS:
4881 /*
4882 * The show must go on: exit, but mark the
4883 * stateid as needing recovery.
4884 */
4885 case -NFS4ERR_DELEG_REVOKED:
4886 case -NFS4ERR_ADMIN_REVOKED:
4887 case -NFS4ERR_BAD_STATEID:
4888 case -NFS4ERR_OPENMODE:
4889 nfs4_schedule_stateid_recovery(server, state);
4890 err = 0;
4891 goto out;
4892 case -EKEYEXPIRED:
4893 /*
4894 * User RPCSEC_GSS context has expired.
4895 * We cannot recover this stateid now, so
4896 * skip it and allow recovery thread to
4897 * proceed.
4898 */
4899 err = 0;
4900 goto out;
4901 case -ENOMEM:
4902 case -NFS4ERR_DENIED:
4903 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4904 err = 0;
4905 goto out;
4906 case -NFS4ERR_DELAY:
4907 break;
4908 }
4909 err = nfs4_handle_exception(server, err, &exception);
4910 } while (exception.retry);
4911out:
4912 return err;
4913}
4914
4915struct nfs_release_lockowner_data {
4916 struct nfs4_lock_state *lsp;
4917 struct nfs_server *server;
4918 struct nfs_release_lockowner_args args;
4919};
4920
4921static void nfs4_release_lockowner_release(void *calldata)
4922{
4923 struct nfs_release_lockowner_data *data = calldata;
4924 nfs4_free_lock_state(data->server, data->lsp);
4925 kfree(calldata);
4926}
4927
4928static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4929 .rpc_release = nfs4_release_lockowner_release,
4930};
4931
4932int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4933{
4934 struct nfs_server *server = lsp->ls_state->owner->so_server;
4935 struct nfs_release_lockowner_data *data;
4936 struct rpc_message msg = {
4937 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4938 };
4939
4940 if (server->nfs_client->cl_mvops->minor_version != 0)
4941 return -EINVAL;
4942 data = kmalloc(sizeof(*data), GFP_NOFS);
4943 if (!data)
4944 return -ENOMEM;
4945 data->lsp = lsp;
4946 data->server = server;
4947 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4948 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4949 data->args.lock_owner.s_dev = server->s_dev;
4950 msg.rpc_argp = &data->args;
4951 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4952 return 0;
4953}
4954
4955#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4956
4957static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4958 const void *buf, size_t buflen,
4959 int flags, int type)
4960{
4961 if (strcmp(key, "") != 0)
4962 return -EINVAL;
4963
4964 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4965}
4966
4967static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4968 void *buf, size_t buflen, int type)
4969{
4970 if (strcmp(key, "") != 0)
4971 return -EINVAL;
4972
4973 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4974}
4975
4976static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4977 size_t list_len, const char *name,
4978 size_t name_len, int type)
4979{
4980 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4981
4982 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4983 return 0;
4984
4985 if (list && len <= list_len)
4986 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4987 return len;
4988}
4989
4990/*
4991 * nfs_fhget will use either the mounted_on_fileid or the fileid
4992 */
4993static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4994{
4995 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4996 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4997 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4998 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4999 return;
5000
5001 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5002 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5003 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5004 fattr->nlink = 2;
5005}
5006
5007static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5008 const struct qstr *name,
5009 struct nfs4_fs_locations *fs_locations,
5010 struct page *page)
5011{
5012 struct nfs_server *server = NFS_SERVER(dir);
5013 u32 bitmask[2] = {
5014 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5015 };
5016 struct nfs4_fs_locations_arg args = {
5017 .dir_fh = NFS_FH(dir),
5018 .name = name,
5019 .page = page,
5020 .bitmask = bitmask,
5021 };
5022 struct nfs4_fs_locations_res res = {
5023 .fs_locations = fs_locations,
5024 };
5025 struct rpc_message msg = {
5026 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5027 .rpc_argp = &args,
5028 .rpc_resp = &res,
5029 };
5030 int status;
5031
5032 dprintk("%s: start\n", __func__);
5033
5034 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5035 * is not supported */
5036 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5037 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5038 else
5039 bitmask[0] |= FATTR4_WORD0_FILEID;
5040
5041 nfs_fattr_init(&fs_locations->fattr);
5042 fs_locations->server = server;
5043 fs_locations->nlocations = 0;
5044 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5045 dprintk("%s: returned status = %d\n", __func__, status);
5046 return status;
5047}
5048
5049int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5050 const struct qstr *name,
5051 struct nfs4_fs_locations *fs_locations,
5052 struct page *page)
5053{
5054 struct nfs4_exception exception = { };
5055 int err;
5056 do {
5057 err = nfs4_handle_exception(NFS_SERVER(dir),
5058 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5059 &exception);
5060 } while (exception.retry);
5061 return err;
5062}
5063
5064static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5065{
5066 int status;
5067 struct nfs4_secinfo_arg args = {
5068 .dir_fh = NFS_FH(dir),
5069 .name = name,
5070 };
5071 struct nfs4_secinfo_res res = {
5072 .flavors = flavors,
5073 };
5074 struct rpc_message msg = {
5075 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5076 .rpc_argp = &args,
5077 .rpc_resp = &res,
5078 };
5079
5080 dprintk("NFS call secinfo %s\n", name->name);
5081 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5082 dprintk("NFS reply secinfo: %d\n", status);
5083 return status;
5084}
5085
5086int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5087 struct nfs4_secinfo_flavors *flavors)
5088{
5089 struct nfs4_exception exception = { };
5090 int err;
5091 do {
5092 err = nfs4_handle_exception(NFS_SERVER(dir),
5093 _nfs4_proc_secinfo(dir, name, flavors),
5094 &exception);
5095 } while (exception.retry);
5096 return err;
5097}
5098
5099#ifdef CONFIG_NFS_V4_1
5100/*
5101 * Check the exchange flags returned by the server for invalid flags, having
5102 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5103 * DS flags set.
5104 */
5105static int nfs4_check_cl_exchange_flags(u32 flags)
5106{
5107 if (flags & ~EXCHGID4_FLAG_MASK_R)
5108 goto out_inval;
5109 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5110 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5111 goto out_inval;
5112 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5113 goto out_inval;
5114 return NFS_OK;
5115out_inval:
5116 return -NFS4ERR_INVAL;
5117}
5118
5119static bool
5120nfs41_same_server_scope(struct nfs41_server_scope *a,
5121 struct nfs41_server_scope *b)
5122{
5123 if (a->server_scope_sz == b->server_scope_sz &&
5124 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5125 return true;
5126
5127 return false;
5128}
5129
5130/*
5131 * nfs4_proc_bind_conn_to_session()
5132 *
5133 * The 4.1 client currently uses the same TCP connection for the
5134 * fore and backchannel.
5135 */
5136int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5137{
5138 int status;
5139 struct nfs41_bind_conn_to_session_res res;
5140 struct rpc_message msg = {
5141 .rpc_proc =
5142 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5143 .rpc_argp = clp,
5144 .rpc_resp = &res,
5145 .rpc_cred = cred,
5146 };
5147
5148 dprintk("--> %s\n", __func__);
5149 BUG_ON(clp == NULL);
5150
5151 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5152 if (unlikely(res.session == NULL)) {
5153 status = -ENOMEM;
5154 goto out;
5155 }
5156
5157 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5158 if (status == 0) {
5159 if (memcmp(res.session->sess_id.data,
5160 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5161 dprintk("NFS: %s: Session ID mismatch\n", __func__);
5162 status = -EIO;
5163 goto out_session;
5164 }
5165 if (res.dir != NFS4_CDFS4_BOTH) {
5166 dprintk("NFS: %s: Unexpected direction from server\n",
5167 __func__);
5168 status = -EIO;
5169 goto out_session;
5170 }
5171 if (res.use_conn_in_rdma_mode) {
5172 dprintk("NFS: %s: Server returned RDMA mode = true\n",
5173 __func__);
5174 status = -EIO;
5175 goto out_session;
5176 }
5177 }
5178out_session:
5179 kfree(res.session);
5180out:
5181 dprintk("<-- %s status= %d\n", __func__, status);
5182 return status;
5183}
5184
5185/*
5186 * nfs4_proc_exchange_id()
5187 *
5188 * Since the clientid has expired, all compounds using sessions
5189 * associated with the stale clientid will be returning
5190 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5191 * be in some phase of session reset.
5192 */
5193int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5194{
5195 nfs4_verifier verifier;
5196 struct nfs41_exchange_id_args args = {
5197 .verifier = &verifier,
5198 .client = clp,
5199 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5200 };
5201 struct nfs41_exchange_id_res res = {
5202 0
5203 };
5204 int status;
5205 struct rpc_message msg = {
5206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5207 .rpc_argp = &args,
5208 .rpc_resp = &res,
5209 .rpc_cred = cred,
5210 };
5211
5212 dprintk("--> %s\n", __func__);
5213 BUG_ON(clp == NULL);
5214
5215 nfs4_init_boot_verifier(clp, &verifier);
5216
5217 args.id_len = scnprintf(args.id, sizeof(args.id),
5218 "%s/%s/%u",
5219 clp->cl_ipaddr,
5220 clp->cl_rpcclient->cl_nodename,
5221 clp->cl_rpcclient->cl_auth->au_flavor);
5222
5223 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5224 GFP_NOFS);
5225 if (unlikely(res.server_owner == NULL)) {
5226 status = -ENOMEM;
5227 goto out;
5228 }
5229
5230 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5231 GFP_NOFS);
5232 if (unlikely(res.server_scope == NULL)) {
5233 status = -ENOMEM;
5234 goto out_server_owner;
5235 }
5236
5237 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5238 if (unlikely(res.impl_id == NULL)) {
5239 status = -ENOMEM;
5240 goto out_server_scope;
5241 }
5242
5243 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5244 if (status == 0)
5245 status = nfs4_check_cl_exchange_flags(res.flags);
5246
5247 if (status == 0) {
5248 clp->cl_clientid = res.clientid;
5249 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5250 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5251 clp->cl_seqid = res.seqid;
5252
5253 kfree(clp->cl_serverowner);
5254 clp->cl_serverowner = res.server_owner;
5255 res.server_owner = NULL;
5256
5257 /* use the most recent implementation id */
5258 kfree(clp->cl_implid);
5259 clp->cl_implid = res.impl_id;
5260
5261 if (clp->cl_serverscope != NULL &&
5262 !nfs41_same_server_scope(clp->cl_serverscope,
5263 res.server_scope)) {
5264 dprintk("%s: server_scope mismatch detected\n",
5265 __func__);
5266 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5267 kfree(clp->cl_serverscope);
5268 clp->cl_serverscope = NULL;
5269 }
5270
5271 if (clp->cl_serverscope == NULL) {
5272 clp->cl_serverscope = res.server_scope;
5273 goto out;
5274 }
5275 } else
5276 kfree(res.impl_id);
5277
5278out_server_owner:
5279 kfree(res.server_owner);
5280out_server_scope:
5281 kfree(res.server_scope);
5282out:
5283 if (clp->cl_implid != NULL)
5284 dprintk("%s: Server Implementation ID: "
5285 "domain: %s, name: %s, date: %llu,%u\n",
5286 __func__, clp->cl_implid->domain, clp->cl_implid->name,
5287 clp->cl_implid->date.seconds,
5288 clp->cl_implid->date.nseconds);
5289 dprintk("<-- %s status= %d\n", __func__, status);
5290 return status;
5291}
5292
5293static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5294 struct rpc_cred *cred)
5295{
5296 struct rpc_message msg = {
5297 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5298 .rpc_argp = clp,
5299 .rpc_cred = cred,
5300 };
5301 int status;
5302
5303 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5304 if (status)
5305 dprintk("NFS: Got error %d from the server %s on "
5306 "DESTROY_CLIENTID.", status, clp->cl_hostname);
5307 return status;
5308}
5309
5310static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5311 struct rpc_cred *cred)
5312{
5313 unsigned int loop;
5314 int ret;
5315
5316 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5317 ret = _nfs4_proc_destroy_clientid(clp, cred);
5318 switch (ret) {
5319 case -NFS4ERR_DELAY:
5320 case -NFS4ERR_CLIENTID_BUSY:
5321 ssleep(1);
5322 break;
5323 default:
5324 return ret;
5325 }
5326 }
5327 return 0;
5328}
5329
5330int nfs4_destroy_clientid(struct nfs_client *clp)
5331{
5332 struct rpc_cred *cred;
5333 int ret = 0;
5334
5335 if (clp->cl_mvops->minor_version < 1)
5336 goto out;
5337 if (clp->cl_exchange_flags == 0)
5338 goto out;
5339 cred = nfs4_get_exchange_id_cred(clp);
5340 ret = nfs4_proc_destroy_clientid(clp, cred);
5341 if (cred)
5342 put_rpccred(cred);
5343 switch (ret) {
5344 case 0:
5345 case -NFS4ERR_STALE_CLIENTID:
5346 clp->cl_exchange_flags = 0;
5347 }
5348out:
5349 return ret;
5350}
5351
5352struct nfs4_get_lease_time_data {
5353 struct nfs4_get_lease_time_args *args;
5354 struct nfs4_get_lease_time_res *res;
5355 struct nfs_client *clp;
5356};
5357
5358static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5359 void *calldata)
5360{
5361 int ret;
5362 struct nfs4_get_lease_time_data *data =
5363 (struct nfs4_get_lease_time_data *)calldata;
5364
5365 dprintk("--> %s\n", __func__);
5366 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5367 /* just setup sequence, do not trigger session recovery
5368 since we're invoked within one */
5369 ret = nfs41_setup_sequence(data->clp->cl_session,
5370 &data->args->la_seq_args,
5371 &data->res->lr_seq_res, task);
5372
5373 BUG_ON(ret == -EAGAIN);
5374 rpc_call_start(task);
5375 dprintk("<-- %s\n", __func__);
5376}
5377
5378/*
5379 * Called from nfs4_state_manager thread for session setup, so don't recover
5380 * from sequence operation or clientid errors.
5381 */
5382static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5383{
5384 struct nfs4_get_lease_time_data *data =
5385 (struct nfs4_get_lease_time_data *)calldata;
5386
5387 dprintk("--> %s\n", __func__);
5388 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5389 return;
5390 switch (task->tk_status) {
5391 case -NFS4ERR_DELAY:
5392 case -NFS4ERR_GRACE:
5393 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5394 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5395 task->tk_status = 0;
5396 /* fall through */
5397 case -NFS4ERR_RETRY_UNCACHED_REP:
5398 rpc_restart_call_prepare(task);
5399 return;
5400 }
5401 dprintk("<-- %s\n", __func__);
5402}
5403
5404static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5405 .rpc_call_prepare = nfs4_get_lease_time_prepare,
5406 .rpc_call_done = nfs4_get_lease_time_done,
5407};
5408
5409int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5410{
5411 struct rpc_task *task;
5412 struct nfs4_get_lease_time_args args;
5413 struct nfs4_get_lease_time_res res = {
5414 .lr_fsinfo = fsinfo,
5415 };
5416 struct nfs4_get_lease_time_data data = {
5417 .args = &args,
5418 .res = &res,
5419 .clp = clp,
5420 };
5421 struct rpc_message msg = {
5422 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5423 .rpc_argp = &args,
5424 .rpc_resp = &res,
5425 };
5426 struct rpc_task_setup task_setup = {
5427 .rpc_client = clp->cl_rpcclient,
5428 .rpc_message = &msg,
5429 .callback_ops = &nfs4_get_lease_time_ops,
5430 .callback_data = &data,
5431 .flags = RPC_TASK_TIMEOUT,
5432 };
5433 int status;
5434
5435 nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5436 dprintk("--> %s\n", __func__);
5437 task = rpc_run_task(&task_setup);
5438
5439 if (IS_ERR(task))
5440 status = PTR_ERR(task);
5441 else {
5442 status = task->tk_status;
5443 rpc_put_task(task);
5444 }
5445 dprintk("<-- %s return %d\n", __func__, status);
5446
5447 return status;
5448}
5449
5450static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5451{
5452 return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5453}
5454
5455static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5456 struct nfs4_slot *new,
5457 u32 max_slots,
5458 u32 ivalue)
5459{
5460 struct nfs4_slot *old = NULL;
5461 u32 i;
5462
5463 spin_lock(&tbl->slot_tbl_lock);
5464 if (new) {
5465 old = tbl->slots;
5466 tbl->slots = new;
5467 tbl->max_slots = max_slots;
5468 }
5469 tbl->highest_used_slotid = -1; /* no slot is currently used */
5470 for (i = 0; i < tbl->max_slots; i++)
5471 tbl->slots[i].seq_nr = ivalue;
5472 spin_unlock(&tbl->slot_tbl_lock);
5473 kfree(old);
5474}
5475
5476/*
5477 * (re)Initialise a slot table
5478 */
5479static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5480 u32 ivalue)
5481{
5482 struct nfs4_slot *new = NULL;
5483 int ret = -ENOMEM;
5484
5485 dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5486 max_reqs, tbl->max_slots);
5487
5488 /* Does the newly negotiated max_reqs match the existing slot table? */
5489 if (max_reqs != tbl->max_slots) {
5490 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5491 if (!new)
5492 goto out;
5493 }
5494 ret = 0;
5495
5496 nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5497 dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5498 tbl, tbl->slots, tbl->max_slots);
5499out:
5500 dprintk("<-- %s: return %d\n", __func__, ret);
5501 return ret;
5502}
5503
5504/* Destroy the slot table */
5505static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5506{
5507 if (session->fc_slot_table.slots != NULL) {
5508 kfree(session->fc_slot_table.slots);
5509 session->fc_slot_table.slots = NULL;
5510 }
5511 if (session->bc_slot_table.slots != NULL) {
5512 kfree(session->bc_slot_table.slots);
5513 session->bc_slot_table.slots = NULL;
5514 }
5515 return;
5516}
5517
5518/*
5519 * Initialize or reset the forechannel and backchannel tables
5520 */
5521static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5522{
5523 struct nfs4_slot_table *tbl;
5524 int status;
5525
5526 dprintk("--> %s\n", __func__);
5527 /* Fore channel */
5528 tbl = &ses->fc_slot_table;
5529 status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5530 if (status) /* -ENOMEM */
5531 return status;
5532 /* Back channel */
5533 tbl = &ses->bc_slot_table;
5534 status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5535 if (status && tbl->slots == NULL)
5536 /* Fore and back channel share a connection so get
5537 * both slot tables or neither */
5538 nfs4_destroy_slot_tables(ses);
5539 return status;
5540}
5541
5542struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5543{
5544 struct nfs4_session *session;
5545 struct nfs4_slot_table *tbl;
5546
5547 session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5548 if (!session)
5549 return NULL;
5550
5551 tbl = &session->fc_slot_table;
5552 tbl->highest_used_slotid = NFS4_NO_SLOT;
5553 spin_lock_init(&tbl->slot_tbl_lock);
5554 rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5555 init_completion(&tbl->complete);
5556
5557 tbl = &session->bc_slot_table;
5558 tbl->highest_used_slotid = NFS4_NO_SLOT;
5559 spin_lock_init(&tbl->slot_tbl_lock);
5560 rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5561 init_completion(&tbl->complete);
5562
5563 session->session_state = 1<<NFS4_SESSION_INITING;
5564
5565 session->clp = clp;
5566 return session;
5567}
5568
5569void nfs4_destroy_session(struct nfs4_session *session)
5570{
5571 struct rpc_xprt *xprt;
5572 struct rpc_cred *cred;
5573
5574 cred = nfs4_get_exchange_id_cred(session->clp);
5575 nfs4_proc_destroy_session(session, cred);
5576 if (cred)
5577 put_rpccred(cred);
5578
5579 rcu_read_lock();
5580 xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5581 rcu_read_unlock();
5582 dprintk("%s Destroy backchannel for xprt %p\n",
5583 __func__, xprt);
5584 xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5585 nfs4_destroy_slot_tables(session);
5586 kfree(session);
5587}
5588
5589/*
5590 * Initialize the values to be used by the client in CREATE_SESSION
5591 * If nfs4_init_session set the fore channel request and response sizes,
5592 * use them.
5593 *
5594 * Set the back channel max_resp_sz_cached to zero to force the client to
5595 * always set csa_cachethis to FALSE because the current implementation
5596 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5597 */
5598static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5599{
5600 struct nfs4_session *session = args->client->cl_session;
5601 unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5602 mxresp_sz = session->fc_attrs.max_resp_sz;
5603
5604 if (mxrqst_sz == 0)
5605 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5606 if (mxresp_sz == 0)
5607 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5608 /* Fore channel attributes */
5609 args->fc_attrs.max_rqst_sz = mxrqst_sz;
5610 args->fc_attrs.max_resp_sz = mxresp_sz;
5611 args->fc_attrs.max_ops = NFS4_MAX_OPS;
5612 args->fc_attrs.max_reqs = max_session_slots;
5613
5614 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5615 "max_ops=%u max_reqs=%u\n",
5616 __func__,
5617 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5618 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5619
5620 /* Back channel attributes */
5621 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5622 args->bc_attrs.max_resp_sz = PAGE_SIZE;
5623 args->bc_attrs.max_resp_sz_cached = 0;
5624 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5625 args->bc_attrs.max_reqs = 1;
5626
5627 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5628 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5629 __func__,
5630 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5631 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5632 args->bc_attrs.max_reqs);
5633}
5634
5635static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5636{
5637 struct nfs4_channel_attrs *sent = &args->fc_attrs;
5638 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5639
5640 if (rcvd->max_resp_sz > sent->max_resp_sz)
5641 return -EINVAL;
5642 /*
5643 * Our requested max_ops is the minimum we need; we're not
5644 * prepared to break up compounds into smaller pieces than that.
5645 * So, no point even trying to continue if the server won't
5646 * cooperate:
5647 */
5648 if (rcvd->max_ops < sent->max_ops)
5649 return -EINVAL;
5650 if (rcvd->max_reqs == 0)
5651 return -EINVAL;
5652 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5653 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5654 return 0;
5655}
5656
5657static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5658{
5659 struct nfs4_channel_attrs *sent = &args->bc_attrs;
5660 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5661
5662 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5663 return -EINVAL;
5664 if (rcvd->max_resp_sz < sent->max_resp_sz)
5665 return -EINVAL;
5666 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5667 return -EINVAL;
5668 /* These would render the backchannel useless: */
5669 if (rcvd->max_ops != sent->max_ops)
5670 return -EINVAL;
5671 if (rcvd->max_reqs != sent->max_reqs)
5672 return -EINVAL;
5673 return 0;
5674}
5675
5676static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5677 struct nfs4_session *session)
5678{
5679 int ret;
5680
5681 ret = nfs4_verify_fore_channel_attrs(args, session);
5682 if (ret)
5683 return ret;
5684 return nfs4_verify_back_channel_attrs(args, session);
5685}
5686
5687static int _nfs4_proc_create_session(struct nfs_client *clp,
5688 struct rpc_cred *cred)
5689{
5690 struct nfs4_session *session = clp->cl_session;
5691 struct nfs41_create_session_args args = {
5692 .client = clp,
5693 .cb_program = NFS4_CALLBACK,
5694 };
5695 struct nfs41_create_session_res res = {
5696 .client = clp,
5697 };
5698 struct rpc_message msg = {
5699 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5700 .rpc_argp = &args,
5701 .rpc_resp = &res,
5702 .rpc_cred = cred,
5703 };
5704 int status;
5705
5706 nfs4_init_channel_attrs(&args);
5707 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5708
5709 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5710
5711 if (!status)
5712 /* Verify the session's negotiated channel_attrs values */
5713 status = nfs4_verify_channel_attrs(&args, session);
5714 if (!status) {
5715 /* Increment the clientid slot sequence id */
5716 clp->cl_seqid++;
5717 }
5718
5719 return status;
5720}
5721
5722/*
5723 * Issues a CREATE_SESSION operation to the server.
5724 * It is the responsibility of the caller to verify the session is
5725 * expired before calling this routine.
5726 */
5727int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5728{
5729 int status;
5730 unsigned *ptr;
5731 struct nfs4_session *session = clp->cl_session;
5732
5733 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5734
5735 status = _nfs4_proc_create_session(clp, cred);
5736 if (status)
5737 goto out;
5738
5739 /* Init or reset the session slot tables */
5740 status = nfs4_setup_session_slot_tables(session);
5741 dprintk("slot table setup returned %d\n", status);
5742 if (status)
5743 goto out;
5744
5745 ptr = (unsigned *)&session->sess_id.data[0];
5746 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5747 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5748out:
5749 dprintk("<-- %s\n", __func__);
5750 return status;
5751}
5752
5753/*
5754 * Issue the over-the-wire RPC DESTROY_SESSION.
5755 * The caller must serialize access to this routine.
5756 */
5757int nfs4_proc_destroy_session(struct nfs4_session *session,
5758 struct rpc_cred *cred)
5759{
5760 struct rpc_message msg = {
5761 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5762 .rpc_argp = session,
5763 .rpc_cred = cred,
5764 };
5765 int status = 0;
5766
5767 dprintk("--> nfs4_proc_destroy_session\n");
5768
5769 /* session is still being setup */
5770 if (session->clp->cl_cons_state != NFS_CS_READY)
5771 return status;
5772
5773 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5774
5775 if (status)
5776 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5777 "Session has been destroyed regardless...\n", status);
5778
5779 dprintk("<-- nfs4_proc_destroy_session\n");
5780 return status;
5781}
5782
5783/*
5784 * With sessions, the client is not marked ready until after a
5785 * successful EXCHANGE_ID and CREATE_SESSION.
5786 *
5787 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5788 * other versions of NFS can be tried.
5789 */
5790static int nfs41_check_session_ready(struct nfs_client *clp)
5791{
5792 int ret;
5793
5794 if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5795 ret = nfs4_client_recover_expired_lease(clp);
5796 if (ret)
5797 return ret;
5798 }
5799 if (clp->cl_cons_state < NFS_CS_READY)
5800 return -EPROTONOSUPPORT;
5801 smp_rmb();
5802 return 0;
5803}
5804
5805int nfs4_init_session(struct nfs_server *server)
5806{
5807 struct nfs_client *clp = server->nfs_client;
5808 struct nfs4_session *session;
5809 unsigned int rsize, wsize;
5810
5811 if (!nfs4_has_session(clp))
5812 return 0;
5813
5814 session = clp->cl_session;
5815 spin_lock(&clp->cl_lock);
5816 if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5817
5818 rsize = server->rsize;
5819 if (rsize == 0)
5820 rsize = NFS_MAX_FILE_IO_SIZE;
5821 wsize = server->wsize;
5822 if (wsize == 0)
5823 wsize = NFS_MAX_FILE_IO_SIZE;
5824
5825 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5826 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5827 }
5828 spin_unlock(&clp->cl_lock);
5829
5830 return nfs41_check_session_ready(clp);
5831}
5832
5833int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5834{
5835 struct nfs4_session *session = clp->cl_session;
5836 int ret;
5837
5838 spin_lock(&clp->cl_lock);
5839 if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5840 /*
5841 * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5842 * DS lease to be equal to the MDS lease.
5843 */
5844 clp->cl_lease_time = lease_time;
5845 clp->cl_last_renewal = jiffies;
5846 }
5847 spin_unlock(&clp->cl_lock);
5848
5849 ret = nfs41_check_session_ready(clp);
5850 if (ret)
5851 return ret;
5852 /* Test for the DS role */
5853 if (!is_ds_client(clp))
5854 return -ENODEV;
5855 return 0;
5856}
5857EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5858
5859
5860/*
5861 * Renew the cl_session lease.
5862 */
5863struct nfs4_sequence_data {
5864 struct nfs_client *clp;
5865 struct nfs4_sequence_args args;
5866 struct nfs4_sequence_res res;
5867};
5868
5869static void nfs41_sequence_release(void *data)
5870{
5871 struct nfs4_sequence_data *calldata = data;
5872 struct nfs_client *clp = calldata->clp;
5873
5874 if (atomic_read(&clp->cl_count) > 1)
5875 nfs4_schedule_state_renewal(clp);
5876 nfs_put_client(clp);
5877 kfree(calldata);
5878}
5879
5880static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5881{
5882 switch(task->tk_status) {
5883 case -NFS4ERR_DELAY:
5884 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5885 return -EAGAIN;
5886 default:
5887 nfs4_schedule_lease_recovery(clp);
5888 }
5889 return 0;
5890}
5891
5892static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5893{
5894 struct nfs4_sequence_data *calldata = data;
5895 struct nfs_client *clp = calldata->clp;
5896
5897 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5898 return;
5899
5900 if (task->tk_status < 0) {
5901 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5902 if (atomic_read(&clp->cl_count) == 1)
5903 goto out;
5904
5905 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5906 rpc_restart_call_prepare(task);
5907 return;
5908 }
5909 }
5910 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5911out:
5912 dprintk("<-- %s\n", __func__);
5913}
5914
5915static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5916{
5917 struct nfs4_sequence_data *calldata = data;
5918 struct nfs_client *clp = calldata->clp;
5919 struct nfs4_sequence_args *args;
5920 struct nfs4_sequence_res *res;
5921
5922 args = task->tk_msg.rpc_argp;
5923 res = task->tk_msg.rpc_resp;
5924
5925 if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5926 return;
5927 rpc_call_start(task);
5928}
5929
5930static const struct rpc_call_ops nfs41_sequence_ops = {
5931 .rpc_call_done = nfs41_sequence_call_done,
5932 .rpc_call_prepare = nfs41_sequence_prepare,
5933 .rpc_release = nfs41_sequence_release,
5934};
5935
5936static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5937{
5938 struct nfs4_sequence_data *calldata;
5939 struct rpc_message msg = {
5940 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5941 .rpc_cred = cred,
5942 };
5943 struct rpc_task_setup task_setup_data = {
5944 .rpc_client = clp->cl_rpcclient,
5945 .rpc_message = &msg,
5946 .callback_ops = &nfs41_sequence_ops,
5947 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5948 };
5949
5950 if (!atomic_inc_not_zero(&clp->cl_count))
5951 return ERR_PTR(-EIO);
5952 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5953 if (calldata == NULL) {
5954 nfs_put_client(clp);
5955 return ERR_PTR(-ENOMEM);
5956 }
5957 nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5958 msg.rpc_argp = &calldata->args;
5959 msg.rpc_resp = &calldata->res;
5960 calldata->clp = clp;
5961 task_setup_data.callback_data = calldata;
5962
5963 return rpc_run_task(&task_setup_data);
5964}
5965
5966static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5967{
5968 struct rpc_task *task;
5969 int ret = 0;
5970
5971 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5972 return 0;
5973 task = _nfs41_proc_sequence(clp, cred);
5974 if (IS_ERR(task))
5975 ret = PTR_ERR(task);
5976 else
5977 rpc_put_task_async(task);
5978 dprintk("<-- %s status=%d\n", __func__, ret);
5979 return ret;
5980}
5981
5982static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5983{
5984 struct rpc_task *task;
5985 int ret;
5986
5987 task = _nfs41_proc_sequence(clp, cred);
5988 if (IS_ERR(task)) {
5989 ret = PTR_ERR(task);
5990 goto out;
5991 }
5992 ret = rpc_wait_for_completion_task(task);
5993 if (!ret) {
5994 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5995
5996 if (task->tk_status == 0)
5997 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5998 ret = task->tk_status;
5999 }
6000 rpc_put_task(task);
6001out:
6002 dprintk("<-- %s status=%d\n", __func__, ret);
6003 return ret;
6004}
6005
6006struct nfs4_reclaim_complete_data {
6007 struct nfs_client *clp;
6008 struct nfs41_reclaim_complete_args arg;
6009 struct nfs41_reclaim_complete_res res;
6010};
6011
6012static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6013{
6014 struct nfs4_reclaim_complete_data *calldata = data;
6015
6016 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6017 if (nfs41_setup_sequence(calldata->clp->cl_session,
6018 &calldata->arg.seq_args,
6019 &calldata->res.seq_res, task))
6020 return;
6021
6022 rpc_call_start(task);
6023}
6024
6025static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6026{
6027 switch(task->tk_status) {
6028 case 0:
6029 case -NFS4ERR_COMPLETE_ALREADY:
6030 case -NFS4ERR_WRONG_CRED: /* What to do here? */
6031 break;
6032 case -NFS4ERR_DELAY:
6033 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6034 /* fall through */
6035 case -NFS4ERR_RETRY_UNCACHED_REP:
6036 return -EAGAIN;
6037 default:
6038 nfs4_schedule_lease_recovery(clp);
6039 }
6040 return 0;
6041}
6042
6043static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6044{
6045 struct nfs4_reclaim_complete_data *calldata = data;
6046 struct nfs_client *clp = calldata->clp;
6047 struct nfs4_sequence_res *res = &calldata->res.seq_res;
6048
6049 dprintk("--> %s\n", __func__);
6050 if (!nfs41_sequence_done(task, res))
6051 return;
6052
6053 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6054 rpc_restart_call_prepare(task);
6055 return;
6056 }
6057 dprintk("<-- %s\n", __func__);
6058}
6059
6060static void nfs4_free_reclaim_complete_data(void *data)
6061{
6062 struct nfs4_reclaim_complete_data *calldata = data;
6063
6064 kfree(calldata);
6065}
6066
6067static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6068 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6069 .rpc_call_done = nfs4_reclaim_complete_done,
6070 .rpc_release = nfs4_free_reclaim_complete_data,
6071};
6072
6073/*
6074 * Issue a global reclaim complete.
6075 */
6076static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6077{
6078 struct nfs4_reclaim_complete_data *calldata;
6079 struct rpc_task *task;
6080 struct rpc_message msg = {
6081 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6082 };
6083 struct rpc_task_setup task_setup_data = {
6084 .rpc_client = clp->cl_rpcclient,
6085 .rpc_message = &msg,
6086 .callback_ops = &nfs4_reclaim_complete_call_ops,
6087 .flags = RPC_TASK_ASYNC,
6088 };
6089 int status = -ENOMEM;
6090
6091 dprintk("--> %s\n", __func__);
6092 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6093 if (calldata == NULL)
6094 goto out;
6095 calldata->clp = clp;
6096 calldata->arg.one_fs = 0;
6097
6098 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6099 msg.rpc_argp = &calldata->arg;
6100 msg.rpc_resp = &calldata->res;
6101 task_setup_data.callback_data = calldata;
6102 task = rpc_run_task(&task_setup_data);
6103 if (IS_ERR(task)) {
6104 status = PTR_ERR(task);
6105 goto out;
6106 }
6107 status = nfs4_wait_for_completion_rpc_task(task);
6108 if (status == 0)
6109 status = task->tk_status;
6110 rpc_put_task(task);
6111 return 0;
6112out:
6113 dprintk("<-- %s status=%d\n", __func__, status);
6114 return status;
6115}
6116
6117static void
6118nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6119{
6120 struct nfs4_layoutget *lgp = calldata;
6121 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6122
6123 dprintk("--> %s\n", __func__);
6124 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6125 * right now covering the LAYOUTGET we are about to send.
6126 * However, that is not so catastrophic, and there seems
6127 * to be no way to prevent it completely.
6128 */
6129 if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6130 &lgp->res.seq_res, task))
6131 return;
6132 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6133 NFS_I(lgp->args.inode)->layout,
6134 lgp->args.ctx->state)) {
6135 rpc_exit(task, NFS4_OK);
6136 return;
6137 }
6138 rpc_call_start(task);
6139}
6140
6141static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6142{
6143 struct nfs4_layoutget *lgp = calldata;
6144 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6145
6146 dprintk("--> %s\n", __func__);
6147
6148 if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6149 return;
6150
6151 switch (task->tk_status) {
6152 case 0:
6153 break;
6154 case -NFS4ERR_LAYOUTTRYLATER:
6155 case -NFS4ERR_RECALLCONFLICT:
6156 task->tk_status = -NFS4ERR_DELAY;
6157 /* Fall through */
6158 default:
6159 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6160 rpc_restart_call_prepare(task);
6161 return;
6162 }
6163 }
6164 dprintk("<-- %s\n", __func__);
6165}
6166
6167static size_t max_response_pages(struct nfs_server *server)
6168{
6169 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6170 return nfs_page_array_len(0, max_resp_sz);
6171}
6172
6173static void nfs4_free_pages(struct page **pages, size_t size)
6174{
6175 int i;
6176
6177 if (!pages)
6178 return;
6179
6180 for (i = 0; i < size; i++) {
6181 if (!pages[i])
6182 break;
6183 __free_page(pages[i]);
6184 }
6185 kfree(pages);
6186}
6187
6188static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6189{
6190 struct page **pages;
6191 int i;
6192
6193 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6194 if (!pages) {
6195 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6196 return NULL;
6197 }
6198
6199 for (i = 0; i < size; i++) {
6200 pages[i] = alloc_page(gfp_flags);
6201 if (!pages[i]) {
6202 dprintk("%s: failed to allocate page\n", __func__);
6203 nfs4_free_pages(pages, size);
6204 return NULL;
6205 }
6206 }
6207
6208 return pages;
6209}
6210
6211static void nfs4_layoutget_release(void *calldata)
6212{
6213 struct nfs4_layoutget *lgp = calldata;
6214 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6215 size_t max_pages = max_response_pages(server);
6216
6217 dprintk("--> %s\n", __func__);
6218 nfs4_free_pages(lgp->args.layout.pages, max_pages);
6219 put_nfs_open_context(lgp->args.ctx);
6220 kfree(calldata);
6221 dprintk("<-- %s\n", __func__);
6222}
6223
6224static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6225 .rpc_call_prepare = nfs4_layoutget_prepare,
6226 .rpc_call_done = nfs4_layoutget_done,
6227 .rpc_release = nfs4_layoutget_release,
6228};
6229
6230int nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6231{
6232 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6233 size_t max_pages = max_response_pages(server);
6234 struct rpc_task *task;
6235 struct rpc_message msg = {
6236 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6237 .rpc_argp = &lgp->args,
6238 .rpc_resp = &lgp->res,
6239 };
6240 struct rpc_task_setup task_setup_data = {
6241 .rpc_client = server->client,
6242 .rpc_message = &msg,
6243 .callback_ops = &nfs4_layoutget_call_ops,
6244 .callback_data = lgp,
6245 .flags = RPC_TASK_ASYNC,
6246 };
6247 int status = 0;
6248
6249 dprintk("--> %s\n", __func__);
6250
6251 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6252 if (!lgp->args.layout.pages) {
6253 nfs4_layoutget_release(lgp);
6254 return -ENOMEM;
6255 }
6256 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6257
6258 lgp->res.layoutp = &lgp->args.layout;
6259 lgp->res.seq_res.sr_slot = NULL;
6260 nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6261 task = rpc_run_task(&task_setup_data);
6262 if (IS_ERR(task))
6263 return PTR_ERR(task);
6264 status = nfs4_wait_for_completion_rpc_task(task);
6265 if (status == 0)
6266 status = task->tk_status;
6267 if (status == 0)
6268 status = pnfs_layout_process(lgp);
6269 rpc_put_task(task);
6270 dprintk("<-- %s status=%d\n", __func__, status);
6271 return status;
6272}
6273
6274static void
6275nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6276{
6277 struct nfs4_layoutreturn *lrp = calldata;
6278
6279 dprintk("--> %s\n", __func__);
6280 if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6281 &lrp->res.seq_res, task))
6282 return;
6283 rpc_call_start(task);
6284}
6285
6286static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6287{
6288 struct nfs4_layoutreturn *lrp = calldata;
6289 struct nfs_server *server;
6290 struct pnfs_layout_hdr *lo = lrp->args.layout;
6291
6292 dprintk("--> %s\n", __func__);
6293
6294 if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6295 return;
6296
6297 server = NFS_SERVER(lrp->args.inode);
6298 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6299 rpc_restart_call_prepare(task);
6300 return;
6301 }
6302 spin_lock(&lo->plh_inode->i_lock);
6303 if (task->tk_status == 0 && lrp->res.lrs_present)
6304 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6305 lo->plh_block_lgets--;
6306 spin_unlock(&lo->plh_inode->i_lock);
6307 dprintk("<-- %s\n", __func__);
6308}
6309
6310static void nfs4_layoutreturn_release(void *calldata)
6311{
6312 struct nfs4_layoutreturn *lrp = calldata;
6313
6314 dprintk("--> %s\n", __func__);
6315 put_layout_hdr(lrp->args.layout);
6316 kfree(calldata);
6317 dprintk("<-- %s\n", __func__);
6318}
6319
6320static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6321 .rpc_call_prepare = nfs4_layoutreturn_prepare,
6322 .rpc_call_done = nfs4_layoutreturn_done,
6323 .rpc_release = nfs4_layoutreturn_release,
6324};
6325
6326int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6327{
6328 struct rpc_task *task;
6329 struct rpc_message msg = {
6330 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6331 .rpc_argp = &lrp->args,
6332 .rpc_resp = &lrp->res,
6333 };
6334 struct rpc_task_setup task_setup_data = {
6335 .rpc_client = lrp->clp->cl_rpcclient,
6336 .rpc_message = &msg,
6337 .callback_ops = &nfs4_layoutreturn_call_ops,
6338 .callback_data = lrp,
6339 };
6340 int status;
6341
6342 dprintk("--> %s\n", __func__);
6343 nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6344 task = rpc_run_task(&task_setup_data);
6345 if (IS_ERR(task))
6346 return PTR_ERR(task);
6347 status = task->tk_status;
6348 dprintk("<-- %s status=%d\n", __func__, status);
6349 rpc_put_task(task);
6350 return status;
6351}
6352
6353/*
6354 * Retrieve the list of Data Server devices from the MDS.
6355 */
6356static int _nfs4_getdevicelist(struct nfs_server *server,
6357 const struct nfs_fh *fh,
6358 struct pnfs_devicelist *devlist)
6359{
6360 struct nfs4_getdevicelist_args args = {
6361 .fh = fh,
6362 .layoutclass = server->pnfs_curr_ld->id,
6363 };
6364 struct nfs4_getdevicelist_res res = {
6365 .devlist = devlist,
6366 };
6367 struct rpc_message msg = {
6368 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6369 .rpc_argp = &args,
6370 .rpc_resp = &res,
6371 };
6372 int status;
6373
6374 dprintk("--> %s\n", __func__);
6375 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6376 &res.seq_res, 0);
6377 dprintk("<-- %s status=%d\n", __func__, status);
6378 return status;
6379}
6380
6381int nfs4_proc_getdevicelist(struct nfs_server *server,
6382 const struct nfs_fh *fh,
6383 struct pnfs_devicelist *devlist)
6384{
6385 struct nfs4_exception exception = { };
6386 int err;
6387
6388 do {
6389 err = nfs4_handle_exception(server,
6390 _nfs4_getdevicelist(server, fh, devlist),
6391 &exception);
6392 } while (exception.retry);
6393
6394 dprintk("%s: err=%d, num_devs=%u\n", __func__,
6395 err, devlist->num_devs);
6396
6397 return err;
6398}
6399EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6400
6401static int
6402_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6403{
6404 struct nfs4_getdeviceinfo_args args = {
6405 .pdev = pdev,
6406 };
6407 struct nfs4_getdeviceinfo_res res = {
6408 .pdev = pdev,
6409 };
6410 struct rpc_message msg = {
6411 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6412 .rpc_argp = &args,
6413 .rpc_resp = &res,
6414 };
6415 int status;
6416
6417 dprintk("--> %s\n", __func__);
6418 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6419 dprintk("<-- %s status=%d\n", __func__, status);
6420
6421 return status;
6422}
6423
6424int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6425{
6426 struct nfs4_exception exception = { };
6427 int err;
6428
6429 do {
6430 err = nfs4_handle_exception(server,
6431 _nfs4_proc_getdeviceinfo(server, pdev),
6432 &exception);
6433 } while (exception.retry);
6434 return err;
6435}
6436EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6437
6438static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6439{
6440 struct nfs4_layoutcommit_data *data = calldata;
6441 struct nfs_server *server = NFS_SERVER(data->args.inode);
6442
6443 if (nfs4_setup_sequence(server, &data->args.seq_args,
6444 &data->res.seq_res, task))
6445 return;
6446 rpc_call_start(task);
6447}
6448
6449static void
6450nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6451{
6452 struct nfs4_layoutcommit_data *data = calldata;
6453 struct nfs_server *server = NFS_SERVER(data->args.inode);
6454
6455 if (!nfs4_sequence_done(task, &data->res.seq_res))
6456 return;
6457
6458 switch (task->tk_status) { /* Just ignore these failures */
6459 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6460 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
6461 case -NFS4ERR_BADLAYOUT: /* no layout */
6462 case -NFS4ERR_GRACE: /* loca_recalim always false */
6463 task->tk_status = 0;
6464 break;
6465 case 0:
6466 nfs_post_op_update_inode_force_wcc(data->args.inode,
6467 data->res.fattr);
6468 break;
6469 default:
6470 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6471 rpc_restart_call_prepare(task);
6472 return;
6473 }
6474 }
6475}
6476
6477static void nfs4_layoutcommit_release(void *calldata)
6478{
6479 struct nfs4_layoutcommit_data *data = calldata;
6480 struct pnfs_layout_segment *lseg, *tmp;
6481 unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6482
6483 pnfs_cleanup_layoutcommit(data);
6484 /* Matched by references in pnfs_set_layoutcommit */
6485 list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6486 list_del_init(&lseg->pls_lc_list);
6487 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6488 &lseg->pls_flags))
6489 put_lseg(lseg);
6490 }
6491
6492 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6493 smp_mb__after_clear_bit();
6494 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6495
6496 put_rpccred(data->cred);
6497 kfree(data);
6498}
6499
6500static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6501 .rpc_call_prepare = nfs4_layoutcommit_prepare,
6502 .rpc_call_done = nfs4_layoutcommit_done,
6503 .rpc_release = nfs4_layoutcommit_release,
6504};
6505
6506int
6507nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6508{
6509 struct rpc_message msg = {
6510 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6511 .rpc_argp = &data->args,
6512 .rpc_resp = &data->res,
6513 .rpc_cred = data->cred,
6514 };
6515 struct rpc_task_setup task_setup_data = {
6516 .task = &data->task,
6517 .rpc_client = NFS_CLIENT(data->args.inode),
6518 .rpc_message = &msg,
6519 .callback_ops = &nfs4_layoutcommit_ops,
6520 .callback_data = data,
6521 .flags = RPC_TASK_ASYNC,
6522 };
6523 struct rpc_task *task;
6524 int status = 0;
6525
6526 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6527 "lbw: %llu inode %lu\n",
6528 data->task.tk_pid, sync,
6529 data->args.lastbytewritten,
6530 data->args.inode->i_ino);
6531
6532 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6533 task = rpc_run_task(&task_setup_data);
6534 if (IS_ERR(task))
6535 return PTR_ERR(task);
6536 if (sync == false)
6537 goto out;
6538 status = nfs4_wait_for_completion_rpc_task(task);
6539 if (status != 0)
6540 goto out;
6541 status = task->tk_status;
6542out:
6543 dprintk("%s: status %d\n", __func__, status);
6544 rpc_put_task(task);
6545 return status;
6546}
6547
6548static int
6549_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6550 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6551{
6552 struct nfs41_secinfo_no_name_args args = {
6553 .style = SECINFO_STYLE_CURRENT_FH,
6554 };
6555 struct nfs4_secinfo_res res = {
6556 .flavors = flavors,
6557 };
6558 struct rpc_message msg = {
6559 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6560 .rpc_argp = &args,
6561 .rpc_resp = &res,
6562 };
6563 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6564}
6565
6566static int
6567nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6568 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6569{
6570 struct nfs4_exception exception = { };
6571 int err;
6572 do {
6573 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6574 switch (err) {
6575 case 0:
6576 case -NFS4ERR_WRONGSEC:
6577 case -NFS4ERR_NOTSUPP:
6578 goto out;
6579 default:
6580 err = nfs4_handle_exception(server, err, &exception);
6581 }
6582 } while (exception.retry);
6583out:
6584 return err;
6585}
6586
6587static int
6588nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6589 struct nfs_fsinfo *info)
6590{
6591 int err;
6592 struct page *page;
6593 rpc_authflavor_t flavor;
6594 struct nfs4_secinfo_flavors *flavors;
6595
6596 page = alloc_page(GFP_KERNEL);
6597 if (!page) {
6598 err = -ENOMEM;
6599 goto out;
6600 }
6601
6602 flavors = page_address(page);
6603 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6604
6605 /*
6606 * Fall back on "guess and check" method if
6607 * the server doesn't support SECINFO_NO_NAME
6608 */
6609 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6610 err = nfs4_find_root_sec(server, fhandle, info);
6611 goto out_freepage;
6612 }
6613 if (err)
6614 goto out_freepage;
6615
6616 flavor = nfs_find_best_sec(flavors);
6617 if (err == 0)
6618 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6619
6620out_freepage:
6621 put_page(page);
6622 if (err == -EACCES)
6623 return -EPERM;
6624out:
6625 return err;
6626}
6627
6628static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6629{
6630 int status;
6631 struct nfs41_test_stateid_args args = {
6632 .stateid = stateid,
6633 };
6634 struct nfs41_test_stateid_res res;
6635 struct rpc_message msg = {
6636 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6637 .rpc_argp = &args,
6638 .rpc_resp = &res,
6639 };
6640
6641 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6642 status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6643
6644 if (status == NFS_OK)
6645 return res.status;
6646 return status;
6647}
6648
6649static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6650{
6651 struct nfs4_exception exception = { };
6652 int err;
6653 do {
6654 err = nfs4_handle_exception(server,
6655 _nfs41_test_stateid(server, stateid),
6656 &exception);
6657 } while (exception.retry);
6658 return err;
6659}
6660
6661static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6662{
6663 struct nfs41_free_stateid_args args = {
6664 .stateid = stateid,
6665 };
6666 struct nfs41_free_stateid_res res;
6667 struct rpc_message msg = {
6668 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6669 .rpc_argp = &args,
6670 .rpc_resp = &res,
6671 };
6672
6673 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6674 return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6675}
6676
6677static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6678{
6679 struct nfs4_exception exception = { };
6680 int err;
6681 do {
6682 err = nfs4_handle_exception(server,
6683 _nfs4_free_stateid(server, stateid),
6684 &exception);
6685 } while (exception.retry);
6686 return err;
6687}
6688
6689static bool nfs41_match_stateid(const nfs4_stateid *s1,
6690 const nfs4_stateid *s2)
6691{
6692 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6693 return false;
6694
6695 if (s1->seqid == s2->seqid)
6696 return true;
6697 if (s1->seqid == 0 || s2->seqid == 0)
6698 return true;
6699
6700 return false;
6701}
6702
6703#endif /* CONFIG_NFS_V4_1 */
6704
6705static bool nfs4_match_stateid(const nfs4_stateid *s1,
6706 const nfs4_stateid *s2)
6707{
6708 return nfs4_stateid_match(s1, s2);
6709}
6710
6711
6712static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6713 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6714 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6715 .recover_open = nfs4_open_reclaim,
6716 .recover_lock = nfs4_lock_reclaim,
6717 .establish_clid = nfs4_init_clientid,
6718 .get_clid_cred = nfs4_get_setclientid_cred,
6719};
6720
6721#if defined(CONFIG_NFS_V4_1)
6722static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6723 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6724 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6725 .recover_open = nfs4_open_reclaim,
6726 .recover_lock = nfs4_lock_reclaim,
6727 .establish_clid = nfs41_init_clientid,
6728 .get_clid_cred = nfs4_get_exchange_id_cred,
6729 .reclaim_complete = nfs41_proc_reclaim_complete,
6730};
6731#endif /* CONFIG_NFS_V4_1 */
6732
6733static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6734 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6735 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6736 .recover_open = nfs4_open_expired,
6737 .recover_lock = nfs4_lock_expired,
6738 .establish_clid = nfs4_init_clientid,
6739 .get_clid_cred = nfs4_get_setclientid_cred,
6740};
6741
6742#if defined(CONFIG_NFS_V4_1)
6743static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6744 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6745 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6746 .recover_open = nfs41_open_expired,
6747 .recover_lock = nfs41_lock_expired,
6748 .establish_clid = nfs41_init_clientid,
6749 .get_clid_cred = nfs4_get_exchange_id_cred,
6750};
6751#endif /* CONFIG_NFS_V4_1 */
6752
6753static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6754 .sched_state_renewal = nfs4_proc_async_renew,
6755 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6756 .renew_lease = nfs4_proc_renew,
6757};
6758
6759#if defined(CONFIG_NFS_V4_1)
6760static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6761 .sched_state_renewal = nfs41_proc_async_sequence,
6762 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6763 .renew_lease = nfs4_proc_sequence,
6764};
6765#endif
6766
6767static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6768 .minor_version = 0,
6769 .call_sync = _nfs4_call_sync,
6770 .match_stateid = nfs4_match_stateid,
6771 .find_root_sec = nfs4_find_root_sec,
6772 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6773 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6774 .state_renewal_ops = &nfs40_state_renewal_ops,
6775};
6776
6777#if defined(CONFIG_NFS_V4_1)
6778static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6779 .minor_version = 1,
6780 .call_sync = _nfs4_call_sync_session,
6781 .match_stateid = nfs41_match_stateid,
6782 .find_root_sec = nfs41_find_root_sec,
6783 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6784 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6785 .state_renewal_ops = &nfs41_state_renewal_ops,
6786};
6787#endif
6788
6789const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6790 [0] = &nfs_v4_0_minor_ops,
6791#if defined(CONFIG_NFS_V4_1)
6792 [1] = &nfs_v4_1_minor_ops,
6793#endif
6794};
6795
6796static const struct inode_operations nfs4_file_inode_operations = {
6797 .permission = nfs_permission,
6798 .getattr = nfs_getattr,
6799 .setattr = nfs_setattr,
6800 .getxattr = generic_getxattr,
6801 .setxattr = generic_setxattr,
6802 .listxattr = generic_listxattr,
6803 .removexattr = generic_removexattr,
6804};
6805
6806const struct nfs_rpc_ops nfs_v4_clientops = {
6807 .version = 4, /* protocol version */
6808 .dentry_ops = &nfs4_dentry_operations,
6809 .dir_inode_ops = &nfs4_dir_inode_operations,
6810 .file_inode_ops = &nfs4_file_inode_operations,
6811 .file_ops = &nfs4_file_operations,
6812 .getroot = nfs4_proc_get_root,
6813 .submount = nfs4_submount,
6814 .getattr = nfs4_proc_getattr,
6815 .setattr = nfs4_proc_setattr,
6816 .lookup = nfs4_proc_lookup,
6817 .access = nfs4_proc_access,
6818 .readlink = nfs4_proc_readlink,
6819 .create = nfs4_proc_create,
6820 .remove = nfs4_proc_remove,
6821 .unlink_setup = nfs4_proc_unlink_setup,
6822 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6823 .unlink_done = nfs4_proc_unlink_done,
6824 .rename = nfs4_proc_rename,
6825 .rename_setup = nfs4_proc_rename_setup,
6826 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6827 .rename_done = nfs4_proc_rename_done,
6828 .link = nfs4_proc_link,
6829 .symlink = nfs4_proc_symlink,
6830 .mkdir = nfs4_proc_mkdir,
6831 .rmdir = nfs4_proc_remove,
6832 .readdir = nfs4_proc_readdir,
6833 .mknod = nfs4_proc_mknod,
6834 .statfs = nfs4_proc_statfs,
6835 .fsinfo = nfs4_proc_fsinfo,
6836 .pathconf = nfs4_proc_pathconf,
6837 .set_capabilities = nfs4_server_capabilities,
6838 .decode_dirent = nfs4_decode_dirent,
6839 .read_setup = nfs4_proc_read_setup,
6840 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6841 .read_done = nfs4_read_done,
6842 .write_setup = nfs4_proc_write_setup,
6843 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6844 .write_done = nfs4_write_done,
6845 .commit_setup = nfs4_proc_commit_setup,
6846 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6847 .commit_done = nfs4_commit_done,
6848 .lock = nfs4_proc_lock,
6849 .clear_acl_cache = nfs4_zap_acl_attr,
6850 .close_context = nfs4_close_context,
6851 .open_context = nfs4_atomic_open,
6852 .init_client = nfs4_init_client,
6853};
6854
6855static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6856 .prefix = XATTR_NAME_NFSV4_ACL,
6857 .list = nfs4_xattr_list_nfs4_acl,
6858 .get = nfs4_xattr_get_nfs4_acl,
6859 .set = nfs4_xattr_set_nfs4_acl,
6860};
6861
6862const struct xattr_handler *nfs4_xattr_handlers[] = {
6863 &nfs4_xattr_nfs4_acl_handler,
6864 NULL
6865};
6866
6867module_param(max_session_slots, ushort, 0644);
6868MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6869 "requests the client will negotiate");
6870
6871/*
6872 * Local variables:
6873 * c-basic-offset: 8
6874 * End:
6875 */