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NFS: Add nfs_client behavior flags
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/delay.h>
40#include <linux/errno.h>
41#include <linux/string.h>
42#include <linux/ratelimit.h>
43#include <linux/printk.h>
44#include <linux/slab.h>
45#include <linux/sunrpc/clnt.h>
46#include <linux/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 default:
107 dprintk("%s could not handle NFSv4 error %d\n",
108 __func__, -err);
109 break;
110 }
111 return -EIO;
112}
113
114/*
115 * This is our standard bitmap for GETATTR requests.
116 */
117const u32 nfs4_fattr_bitmap[2] = {
118 FATTR4_WORD0_TYPE
119 | FATTR4_WORD0_CHANGE
120 | FATTR4_WORD0_SIZE
121 | FATTR4_WORD0_FSID
122 | FATTR4_WORD0_FILEID,
123 FATTR4_WORD1_MODE
124 | FATTR4_WORD1_NUMLINKS
125 | FATTR4_WORD1_OWNER
126 | FATTR4_WORD1_OWNER_GROUP
127 | FATTR4_WORD1_RAWDEV
128 | FATTR4_WORD1_SPACE_USED
129 | FATTR4_WORD1_TIME_ACCESS
130 | FATTR4_WORD1_TIME_METADATA
131 | FATTR4_WORD1_TIME_MODIFY
132};
133
134const u32 nfs4_statfs_bitmap[2] = {
135 FATTR4_WORD0_FILES_AVAIL
136 | FATTR4_WORD0_FILES_FREE
137 | FATTR4_WORD0_FILES_TOTAL,
138 FATTR4_WORD1_SPACE_AVAIL
139 | FATTR4_WORD1_SPACE_FREE
140 | FATTR4_WORD1_SPACE_TOTAL
141};
142
143const u32 nfs4_pathconf_bitmap[2] = {
144 FATTR4_WORD0_MAXLINK
145 | FATTR4_WORD0_MAXNAME,
146 0
147};
148
149const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
150 | FATTR4_WORD0_MAXREAD
151 | FATTR4_WORD0_MAXWRITE
152 | FATTR4_WORD0_LEASE_TIME,
153 FATTR4_WORD1_TIME_DELTA
154 | FATTR4_WORD1_FS_LAYOUT_TYPES,
155 FATTR4_WORD2_LAYOUT_BLKSIZE
156};
157
158const u32 nfs4_fs_locations_bitmap[2] = {
159 FATTR4_WORD0_TYPE
160 | FATTR4_WORD0_CHANGE
161 | FATTR4_WORD0_SIZE
162 | FATTR4_WORD0_FSID
163 | FATTR4_WORD0_FILEID
164 | FATTR4_WORD0_FS_LOCATIONS,
165 FATTR4_WORD1_MODE
166 | FATTR4_WORD1_NUMLINKS
167 | FATTR4_WORD1_OWNER
168 | FATTR4_WORD1_OWNER_GROUP
169 | FATTR4_WORD1_RAWDEV
170 | FATTR4_WORD1_SPACE_USED
171 | FATTR4_WORD1_TIME_ACCESS
172 | FATTR4_WORD1_TIME_METADATA
173 | FATTR4_WORD1_TIME_MODIFY
174 | FATTR4_WORD1_MOUNTED_ON_FILEID
175};
176
177static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
178 struct nfs4_readdir_arg *readdir)
179{
180 __be32 *start, *p;
181
182 BUG_ON(readdir->count < 80);
183 if (cookie > 2) {
184 readdir->cookie = cookie;
185 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
186 return;
187 }
188
189 readdir->cookie = 0;
190 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
191 if (cookie == 2)
192 return;
193
194 /*
195 * NFSv4 servers do not return entries for '.' and '..'
196 * Therefore, we fake these entries here. We let '.'
197 * have cookie 0 and '..' have cookie 1. Note that
198 * when talking to the server, we always send cookie 0
199 * instead of 1 or 2.
200 */
201 start = p = kmap_atomic(*readdir->pages);
202
203 if (cookie == 0) {
204 *p++ = xdr_one; /* next */
205 *p++ = xdr_zero; /* cookie, first word */
206 *p++ = xdr_one; /* cookie, second word */
207 *p++ = xdr_one; /* entry len */
208 memcpy(p, ".\0\0\0", 4); /* entry */
209 p++;
210 *p++ = xdr_one; /* bitmap length */
211 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
212 *p++ = htonl(8); /* attribute buffer length */
213 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
214 }
215
216 *p++ = xdr_one; /* next */
217 *p++ = xdr_zero; /* cookie, first word */
218 *p++ = xdr_two; /* cookie, second word */
219 *p++ = xdr_two; /* entry len */
220 memcpy(p, "..\0\0", 4); /* entry */
221 p++;
222 *p++ = xdr_one; /* bitmap length */
223 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
224 *p++ = htonl(8); /* attribute buffer length */
225 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
226
227 readdir->pgbase = (char *)p - (char *)start;
228 readdir->count -= readdir->pgbase;
229 kunmap_atomic(start);
230}
231
232static int nfs4_wait_clnt_recover(struct nfs_client *clp)
233{
234 int res;
235
236 might_sleep();
237
238 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
239 nfs_wait_bit_killable, TASK_KILLABLE);
240 return res;
241}
242
243static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
244{
245 int res = 0;
246
247 might_sleep();
248
249 if (*timeout <= 0)
250 *timeout = NFS4_POLL_RETRY_MIN;
251 if (*timeout > NFS4_POLL_RETRY_MAX)
252 *timeout = NFS4_POLL_RETRY_MAX;
253 freezable_schedule_timeout_killable(*timeout);
254 if (fatal_signal_pending(current))
255 res = -ERESTARTSYS;
256 *timeout <<= 1;
257 return res;
258}
259
260/* This is the error handling routine for processes that are allowed
261 * to sleep.
262 */
263static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
264{
265 struct nfs_client *clp = server->nfs_client;
266 struct nfs4_state *state = exception->state;
267 struct inode *inode = exception->inode;
268 int ret = errorcode;
269
270 exception->retry = 0;
271 switch(errorcode) {
272 case 0:
273 return 0;
274 case -NFS4ERR_OPENMODE:
275 if (inode && nfs_have_delegation(inode, FMODE_READ)) {
276 nfs_inode_return_delegation(inode);
277 exception->retry = 1;
278 return 0;
279 }
280 if (state == NULL)
281 break;
282 nfs4_schedule_stateid_recovery(server, state);
283 goto wait_on_recovery;
284 case -NFS4ERR_DELEG_REVOKED:
285 case -NFS4ERR_ADMIN_REVOKED:
286 case -NFS4ERR_BAD_STATEID:
287 if (state == NULL)
288 break;
289 nfs_remove_bad_delegation(state->inode);
290 nfs4_schedule_stateid_recovery(server, state);
291 goto wait_on_recovery;
292 case -NFS4ERR_EXPIRED:
293 if (state != NULL)
294 nfs4_schedule_stateid_recovery(server, state);
295 case -NFS4ERR_STALE_STATEID:
296 case -NFS4ERR_STALE_CLIENTID:
297 nfs4_schedule_lease_recovery(clp);
298 goto wait_on_recovery;
299#if defined(CONFIG_NFS_V4_1)
300 case -NFS4ERR_BADSESSION:
301 case -NFS4ERR_BADSLOT:
302 case -NFS4ERR_BAD_HIGH_SLOT:
303 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
304 case -NFS4ERR_DEADSESSION:
305 case -NFS4ERR_SEQ_FALSE_RETRY:
306 case -NFS4ERR_SEQ_MISORDERED:
307 dprintk("%s ERROR: %d Reset session\n", __func__,
308 errorcode);
309 nfs4_schedule_session_recovery(clp->cl_session);
310 exception->retry = 1;
311 break;
312#endif /* defined(CONFIG_NFS_V4_1) */
313 case -NFS4ERR_FILE_OPEN:
314 if (exception->timeout > HZ) {
315 /* We have retried a decent amount, time to
316 * fail
317 */
318 ret = -EBUSY;
319 break;
320 }
321 case -NFS4ERR_GRACE:
322 case -NFS4ERR_DELAY:
323 case -EKEYEXPIRED:
324 ret = nfs4_delay(server->client, &exception->timeout);
325 if (ret != 0)
326 break;
327 case -NFS4ERR_RETRY_UNCACHED_REP:
328 case -NFS4ERR_OLD_STATEID:
329 exception->retry = 1;
330 break;
331 case -NFS4ERR_BADOWNER:
332 /* The following works around a Linux server bug! */
333 case -NFS4ERR_BADNAME:
334 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
335 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
336 exception->retry = 1;
337 printk(KERN_WARNING "NFS: v4 server %s "
338 "does not accept raw "
339 "uid/gids. "
340 "Reenabling the idmapper.\n",
341 server->nfs_client->cl_hostname);
342 }
343 }
344 /* We failed to handle the error */
345 return nfs4_map_errors(ret);
346wait_on_recovery:
347 ret = nfs4_wait_clnt_recover(clp);
348 if (ret == 0)
349 exception->retry = 1;
350 return ret;
351}
352
353
354static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
355{
356 spin_lock(&clp->cl_lock);
357 if (time_before(clp->cl_last_renewal,timestamp))
358 clp->cl_last_renewal = timestamp;
359 spin_unlock(&clp->cl_lock);
360}
361
362static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
363{
364 do_renew_lease(server->nfs_client, timestamp);
365}
366
367#if defined(CONFIG_NFS_V4_1)
368
369/*
370 * nfs4_free_slot - free a slot and efficiently update slot table.
371 *
372 * freeing a slot is trivially done by clearing its respective bit
373 * in the bitmap.
374 * If the freed slotid equals highest_used_slotid we want to update it
375 * so that the server would be able to size down the slot table if needed,
376 * otherwise we know that the highest_used_slotid is still in use.
377 * When updating highest_used_slotid there may be "holes" in the bitmap
378 * so we need to scan down from highest_used_slotid to 0 looking for the now
379 * highest slotid in use.
380 * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
381 *
382 * Must be called while holding tbl->slot_tbl_lock
383 */
384static void
385nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
386{
387 BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
388 /* clear used bit in bitmap */
389 __clear_bit(slotid, tbl->used_slots);
390
391 /* update highest_used_slotid when it is freed */
392 if (slotid == tbl->highest_used_slotid) {
393 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
394 if (slotid < tbl->max_slots)
395 tbl->highest_used_slotid = slotid;
396 else
397 tbl->highest_used_slotid = NFS4_NO_SLOT;
398 }
399 dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
400 slotid, tbl->highest_used_slotid);
401}
402
403bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
404{
405 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
406 return true;
407}
408
409/*
410 * Signal state manager thread if session fore channel is drained
411 */
412static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
413{
414 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
415 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
416 nfs4_set_task_privileged, NULL);
417 return;
418 }
419
420 if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
421 return;
422
423 dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
424 complete(&ses->fc_slot_table.complete);
425}
426
427/*
428 * Signal state manager thread if session back channel is drained
429 */
430void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
431{
432 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
433 ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
434 return;
435 dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
436 complete(&ses->bc_slot_table.complete);
437}
438
439static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
440{
441 struct nfs4_slot_table *tbl;
442
443 tbl = &res->sr_session->fc_slot_table;
444 if (!res->sr_slot) {
445 /* just wake up the next guy waiting since
446 * we may have not consumed a slot after all */
447 dprintk("%s: No slot\n", __func__);
448 return;
449 }
450
451 spin_lock(&tbl->slot_tbl_lock);
452 nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
453 nfs4_check_drain_fc_complete(res->sr_session);
454 spin_unlock(&tbl->slot_tbl_lock);
455 res->sr_slot = NULL;
456}
457
458static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
459{
460 unsigned long timestamp;
461 struct nfs_client *clp;
462
463 /*
464 * sr_status remains 1 if an RPC level error occurred. The server
465 * may or may not have processed the sequence operation..
466 * Proceed as if the server received and processed the sequence
467 * operation.
468 */
469 if (res->sr_status == 1)
470 res->sr_status = NFS_OK;
471
472 /* don't increment the sequence number if the task wasn't sent */
473 if (!RPC_WAS_SENT(task))
474 goto out;
475
476 /* Check the SEQUENCE operation status */
477 switch (res->sr_status) {
478 case 0:
479 /* Update the slot's sequence and clientid lease timer */
480 ++res->sr_slot->seq_nr;
481 timestamp = res->sr_renewal_time;
482 clp = res->sr_session->clp;
483 do_renew_lease(clp, timestamp);
484 /* Check sequence flags */
485 if (res->sr_status_flags != 0)
486 nfs4_schedule_lease_recovery(clp);
487 break;
488 case -NFS4ERR_DELAY:
489 /* The server detected a resend of the RPC call and
490 * returned NFS4ERR_DELAY as per Section 2.10.6.2
491 * of RFC5661.
492 */
493 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
494 __func__,
495 res->sr_slot - res->sr_session->fc_slot_table.slots,
496 res->sr_slot->seq_nr);
497 goto out_retry;
498 default:
499 /* Just update the slot sequence no. */
500 ++res->sr_slot->seq_nr;
501 }
502out:
503 /* The session may be reset by one of the error handlers. */
504 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
505 nfs41_sequence_free_slot(res);
506 return 1;
507out_retry:
508 if (!rpc_restart_call(task))
509 goto out;
510 rpc_delay(task, NFS4_POLL_RETRY_MAX);
511 return 0;
512}
513
514static int nfs4_sequence_done(struct rpc_task *task,
515 struct nfs4_sequence_res *res)
516{
517 if (res->sr_session == NULL)
518 return 1;
519 return nfs41_sequence_done(task, res);
520}
521
522/*
523 * nfs4_find_slot - efficiently look for a free slot
524 *
525 * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
526 * If found, we mark the slot as used, update the highest_used_slotid,
527 * and respectively set up the sequence operation args.
528 * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
529 *
530 * Note: must be called with under the slot_tbl_lock.
531 */
532static u32
533nfs4_find_slot(struct nfs4_slot_table *tbl)
534{
535 u32 slotid;
536 u32 ret_id = NFS4_NO_SLOT;
537
538 dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
539 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
540 tbl->max_slots);
541 slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
542 if (slotid >= tbl->max_slots)
543 goto out;
544 __set_bit(slotid, tbl->used_slots);
545 if (slotid > tbl->highest_used_slotid ||
546 tbl->highest_used_slotid == NFS4_NO_SLOT)
547 tbl->highest_used_slotid = slotid;
548 ret_id = slotid;
549out:
550 dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
551 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
552 return ret_id;
553}
554
555static void nfs41_init_sequence(struct nfs4_sequence_args *args,
556 struct nfs4_sequence_res *res, int cache_reply)
557{
558 args->sa_session = NULL;
559 args->sa_cache_this = 0;
560 if (cache_reply)
561 args->sa_cache_this = 1;
562 res->sr_session = NULL;
563 res->sr_slot = NULL;
564}
565
566int nfs41_setup_sequence(struct nfs4_session *session,
567 struct nfs4_sequence_args *args,
568 struct nfs4_sequence_res *res,
569 struct rpc_task *task)
570{
571 struct nfs4_slot *slot;
572 struct nfs4_slot_table *tbl;
573 u32 slotid;
574
575 dprintk("--> %s\n", __func__);
576 /* slot already allocated? */
577 if (res->sr_slot != NULL)
578 return 0;
579
580 tbl = &session->fc_slot_table;
581
582 spin_lock(&tbl->slot_tbl_lock);
583 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
584 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
585 /* The state manager will wait until the slot table is empty */
586 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
587 spin_unlock(&tbl->slot_tbl_lock);
588 dprintk("%s session is draining\n", __func__);
589 return -EAGAIN;
590 }
591
592 if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
593 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
594 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
595 spin_unlock(&tbl->slot_tbl_lock);
596 dprintk("%s enforce FIFO order\n", __func__);
597 return -EAGAIN;
598 }
599
600 slotid = nfs4_find_slot(tbl);
601 if (slotid == NFS4_NO_SLOT) {
602 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
603 spin_unlock(&tbl->slot_tbl_lock);
604 dprintk("<-- %s: no free slots\n", __func__);
605 return -EAGAIN;
606 }
607 spin_unlock(&tbl->slot_tbl_lock);
608
609 rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
610 slot = tbl->slots + slotid;
611 args->sa_session = session;
612 args->sa_slotid = slotid;
613
614 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
615
616 res->sr_session = session;
617 res->sr_slot = slot;
618 res->sr_renewal_time = jiffies;
619 res->sr_status_flags = 0;
620 /*
621 * sr_status is only set in decode_sequence, and so will remain
622 * set to 1 if an rpc level failure occurs.
623 */
624 res->sr_status = 1;
625 return 0;
626}
627EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
628
629int nfs4_setup_sequence(const struct nfs_server *server,
630 struct nfs4_sequence_args *args,
631 struct nfs4_sequence_res *res,
632 struct rpc_task *task)
633{
634 struct nfs4_session *session = nfs4_get_session(server);
635 int ret = 0;
636
637 if (session == NULL)
638 goto out;
639
640 dprintk("--> %s clp %p session %p sr_slot %td\n",
641 __func__, session->clp, session, res->sr_slot ?
642 res->sr_slot - session->fc_slot_table.slots : -1);
643
644 ret = nfs41_setup_sequence(session, args, res, task);
645out:
646 dprintk("<-- %s status=%d\n", __func__, ret);
647 return ret;
648}
649
650struct nfs41_call_sync_data {
651 const struct nfs_server *seq_server;
652 struct nfs4_sequence_args *seq_args;
653 struct nfs4_sequence_res *seq_res;
654};
655
656static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
657{
658 struct nfs41_call_sync_data *data = calldata;
659
660 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
661
662 if (nfs4_setup_sequence(data->seq_server, data->seq_args,
663 data->seq_res, task))
664 return;
665 rpc_call_start(task);
666}
667
668static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
669{
670 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
671 nfs41_call_sync_prepare(task, calldata);
672}
673
674static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
675{
676 struct nfs41_call_sync_data *data = calldata;
677
678 nfs41_sequence_done(task, data->seq_res);
679}
680
681static const struct rpc_call_ops nfs41_call_sync_ops = {
682 .rpc_call_prepare = nfs41_call_sync_prepare,
683 .rpc_call_done = nfs41_call_sync_done,
684};
685
686static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
687 .rpc_call_prepare = nfs41_call_priv_sync_prepare,
688 .rpc_call_done = nfs41_call_sync_done,
689};
690
691static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
692 struct nfs_server *server,
693 struct rpc_message *msg,
694 struct nfs4_sequence_args *args,
695 struct nfs4_sequence_res *res,
696 int privileged)
697{
698 int ret;
699 struct rpc_task *task;
700 struct nfs41_call_sync_data data = {
701 .seq_server = server,
702 .seq_args = args,
703 .seq_res = res,
704 };
705 struct rpc_task_setup task_setup = {
706 .rpc_client = clnt,
707 .rpc_message = msg,
708 .callback_ops = &nfs41_call_sync_ops,
709 .callback_data = &data
710 };
711
712 if (privileged)
713 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
714 task = rpc_run_task(&task_setup);
715 if (IS_ERR(task))
716 ret = PTR_ERR(task);
717 else {
718 ret = task->tk_status;
719 rpc_put_task(task);
720 }
721 return ret;
722}
723
724int _nfs4_call_sync_session(struct rpc_clnt *clnt,
725 struct nfs_server *server,
726 struct rpc_message *msg,
727 struct nfs4_sequence_args *args,
728 struct nfs4_sequence_res *res,
729 int cache_reply)
730{
731 nfs41_init_sequence(args, res, cache_reply);
732 return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
733}
734
735#else
736static inline
737void nfs41_init_sequence(struct nfs4_sequence_args *args,
738 struct nfs4_sequence_res *res, int cache_reply)
739{
740}
741
742static int nfs4_sequence_done(struct rpc_task *task,
743 struct nfs4_sequence_res *res)
744{
745 return 1;
746}
747#endif /* CONFIG_NFS_V4_1 */
748
749int _nfs4_call_sync(struct rpc_clnt *clnt,
750 struct nfs_server *server,
751 struct rpc_message *msg,
752 struct nfs4_sequence_args *args,
753 struct nfs4_sequence_res *res,
754 int cache_reply)
755{
756 nfs41_init_sequence(args, res, cache_reply);
757 return rpc_call_sync(clnt, msg, 0);
758}
759
760static inline
761int nfs4_call_sync(struct rpc_clnt *clnt,
762 struct nfs_server *server,
763 struct rpc_message *msg,
764 struct nfs4_sequence_args *args,
765 struct nfs4_sequence_res *res,
766 int cache_reply)
767{
768 return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
769 args, res, cache_reply);
770}
771
772static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
773{
774 struct nfs_inode *nfsi = NFS_I(dir);
775
776 spin_lock(&dir->i_lock);
777 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
778 if (!cinfo->atomic || cinfo->before != dir->i_version)
779 nfs_force_lookup_revalidate(dir);
780 dir->i_version = cinfo->after;
781 spin_unlock(&dir->i_lock);
782}
783
784struct nfs4_opendata {
785 struct kref kref;
786 struct nfs_openargs o_arg;
787 struct nfs_openres o_res;
788 struct nfs_open_confirmargs c_arg;
789 struct nfs_open_confirmres c_res;
790 struct nfs4_string owner_name;
791 struct nfs4_string group_name;
792 struct nfs_fattr f_attr;
793 struct dentry *dir;
794 struct dentry *dentry;
795 struct nfs4_state_owner *owner;
796 struct nfs4_state *state;
797 struct iattr attrs;
798 unsigned long timestamp;
799 unsigned int rpc_done : 1;
800 int rpc_status;
801 int cancelled;
802};
803
804
805static void nfs4_init_opendata_res(struct nfs4_opendata *p)
806{
807 p->o_res.f_attr = &p->f_attr;
808 p->o_res.seqid = p->o_arg.seqid;
809 p->c_res.seqid = p->c_arg.seqid;
810 p->o_res.server = p->o_arg.server;
811 nfs_fattr_init(&p->f_attr);
812 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
813}
814
815static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
816 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
817 const struct iattr *attrs,
818 gfp_t gfp_mask)
819{
820 struct dentry *parent = dget_parent(dentry);
821 struct inode *dir = parent->d_inode;
822 struct nfs_server *server = NFS_SERVER(dir);
823 struct nfs4_opendata *p;
824
825 p = kzalloc(sizeof(*p), gfp_mask);
826 if (p == NULL)
827 goto err;
828 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
829 if (p->o_arg.seqid == NULL)
830 goto err_free;
831 nfs_sb_active(dentry->d_sb);
832 p->dentry = dget(dentry);
833 p->dir = parent;
834 p->owner = sp;
835 atomic_inc(&sp->so_count);
836 p->o_arg.fh = NFS_FH(dir);
837 p->o_arg.open_flags = flags;
838 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
839 p->o_arg.clientid = server->nfs_client->cl_clientid;
840 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
841 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
842 p->o_arg.name = &dentry->d_name;
843 p->o_arg.server = server;
844 p->o_arg.bitmask = server->attr_bitmask;
845 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
846 if (attrs != NULL && attrs->ia_valid != 0) {
847 __be32 verf[2];
848
849 p->o_arg.u.attrs = &p->attrs;
850 memcpy(&p->attrs, attrs, sizeof(p->attrs));
851
852 verf[0] = jiffies;
853 verf[1] = current->pid;
854 memcpy(p->o_arg.u.verifier.data, verf,
855 sizeof(p->o_arg.u.verifier.data));
856 }
857 p->c_arg.fh = &p->o_res.fh;
858 p->c_arg.stateid = &p->o_res.stateid;
859 p->c_arg.seqid = p->o_arg.seqid;
860 nfs4_init_opendata_res(p);
861 kref_init(&p->kref);
862 return p;
863err_free:
864 kfree(p);
865err:
866 dput(parent);
867 return NULL;
868}
869
870static void nfs4_opendata_free(struct kref *kref)
871{
872 struct nfs4_opendata *p = container_of(kref,
873 struct nfs4_opendata, kref);
874 struct super_block *sb = p->dentry->d_sb;
875
876 nfs_free_seqid(p->o_arg.seqid);
877 if (p->state != NULL)
878 nfs4_put_open_state(p->state);
879 nfs4_put_state_owner(p->owner);
880 dput(p->dir);
881 dput(p->dentry);
882 nfs_sb_deactive(sb);
883 nfs_fattr_free_names(&p->f_attr);
884 kfree(p);
885}
886
887static void nfs4_opendata_put(struct nfs4_opendata *p)
888{
889 if (p != NULL)
890 kref_put(&p->kref, nfs4_opendata_free);
891}
892
893static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
894{
895 int ret;
896
897 ret = rpc_wait_for_completion_task(task);
898 return ret;
899}
900
901static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
902{
903 int ret = 0;
904
905 if (open_mode & (O_EXCL|O_TRUNC))
906 goto out;
907 switch (mode & (FMODE_READ|FMODE_WRITE)) {
908 case FMODE_READ:
909 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
910 && state->n_rdonly != 0;
911 break;
912 case FMODE_WRITE:
913 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
914 && state->n_wronly != 0;
915 break;
916 case FMODE_READ|FMODE_WRITE:
917 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
918 && state->n_rdwr != 0;
919 }
920out:
921 return ret;
922}
923
924static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
925{
926 if (delegation == NULL)
927 return 0;
928 if ((delegation->type & fmode) != fmode)
929 return 0;
930 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
931 return 0;
932 nfs_mark_delegation_referenced(delegation);
933 return 1;
934}
935
936static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
937{
938 switch (fmode) {
939 case FMODE_WRITE:
940 state->n_wronly++;
941 break;
942 case FMODE_READ:
943 state->n_rdonly++;
944 break;
945 case FMODE_READ|FMODE_WRITE:
946 state->n_rdwr++;
947 }
948 nfs4_state_set_mode_locked(state, state->state | fmode);
949}
950
951static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
952{
953 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
954 nfs4_stateid_copy(&state->stateid, stateid);
955 nfs4_stateid_copy(&state->open_stateid, stateid);
956 switch (fmode) {
957 case FMODE_READ:
958 set_bit(NFS_O_RDONLY_STATE, &state->flags);
959 break;
960 case FMODE_WRITE:
961 set_bit(NFS_O_WRONLY_STATE, &state->flags);
962 break;
963 case FMODE_READ|FMODE_WRITE:
964 set_bit(NFS_O_RDWR_STATE, &state->flags);
965 }
966}
967
968static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
969{
970 write_seqlock(&state->seqlock);
971 nfs_set_open_stateid_locked(state, stateid, fmode);
972 write_sequnlock(&state->seqlock);
973}
974
975static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
976{
977 /*
978 * Protect the call to nfs4_state_set_mode_locked and
979 * serialise the stateid update
980 */
981 write_seqlock(&state->seqlock);
982 if (deleg_stateid != NULL) {
983 nfs4_stateid_copy(&state->stateid, deleg_stateid);
984 set_bit(NFS_DELEGATED_STATE, &state->flags);
985 }
986 if (open_stateid != NULL)
987 nfs_set_open_stateid_locked(state, open_stateid, fmode);
988 write_sequnlock(&state->seqlock);
989 spin_lock(&state->owner->so_lock);
990 update_open_stateflags(state, fmode);
991 spin_unlock(&state->owner->so_lock);
992}
993
994static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
995{
996 struct nfs_inode *nfsi = NFS_I(state->inode);
997 struct nfs_delegation *deleg_cur;
998 int ret = 0;
999
1000 fmode &= (FMODE_READ|FMODE_WRITE);
1001
1002 rcu_read_lock();
1003 deleg_cur = rcu_dereference(nfsi->delegation);
1004 if (deleg_cur == NULL)
1005 goto no_delegation;
1006
1007 spin_lock(&deleg_cur->lock);
1008 if (nfsi->delegation != deleg_cur ||
1009 (deleg_cur->type & fmode) != fmode)
1010 goto no_delegation_unlock;
1011
1012 if (delegation == NULL)
1013 delegation = &deleg_cur->stateid;
1014 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1015 goto no_delegation_unlock;
1016
1017 nfs_mark_delegation_referenced(deleg_cur);
1018 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1019 ret = 1;
1020no_delegation_unlock:
1021 spin_unlock(&deleg_cur->lock);
1022no_delegation:
1023 rcu_read_unlock();
1024
1025 if (!ret && open_stateid != NULL) {
1026 __update_open_stateid(state, open_stateid, NULL, fmode);
1027 ret = 1;
1028 }
1029
1030 return ret;
1031}
1032
1033
1034static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1035{
1036 struct nfs_delegation *delegation;
1037
1038 rcu_read_lock();
1039 delegation = rcu_dereference(NFS_I(inode)->delegation);
1040 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1041 rcu_read_unlock();
1042 return;
1043 }
1044 rcu_read_unlock();
1045 nfs_inode_return_delegation(inode);
1046}
1047
1048static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1049{
1050 struct nfs4_state *state = opendata->state;
1051 struct nfs_inode *nfsi = NFS_I(state->inode);
1052 struct nfs_delegation *delegation;
1053 int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1054 fmode_t fmode = opendata->o_arg.fmode;
1055 nfs4_stateid stateid;
1056 int ret = -EAGAIN;
1057
1058 for (;;) {
1059 if (can_open_cached(state, fmode, open_mode)) {
1060 spin_lock(&state->owner->so_lock);
1061 if (can_open_cached(state, fmode, open_mode)) {
1062 update_open_stateflags(state, fmode);
1063 spin_unlock(&state->owner->so_lock);
1064 goto out_return_state;
1065 }
1066 spin_unlock(&state->owner->so_lock);
1067 }
1068 rcu_read_lock();
1069 delegation = rcu_dereference(nfsi->delegation);
1070 if (!can_open_delegated(delegation, fmode)) {
1071 rcu_read_unlock();
1072 break;
1073 }
1074 /* Save the delegation */
1075 nfs4_stateid_copy(&stateid, &delegation->stateid);
1076 rcu_read_unlock();
1077 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1078 if (ret != 0)
1079 goto out;
1080 ret = -EAGAIN;
1081
1082 /* Try to update the stateid using the delegation */
1083 if (update_open_stateid(state, NULL, &stateid, fmode))
1084 goto out_return_state;
1085 }
1086out:
1087 return ERR_PTR(ret);
1088out_return_state:
1089 atomic_inc(&state->count);
1090 return state;
1091}
1092
1093static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1094{
1095 struct inode *inode;
1096 struct nfs4_state *state = NULL;
1097 struct nfs_delegation *delegation;
1098 int ret;
1099
1100 if (!data->rpc_done) {
1101 state = nfs4_try_open_cached(data);
1102 goto out;
1103 }
1104
1105 ret = -EAGAIN;
1106 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1107 goto err;
1108 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1109 ret = PTR_ERR(inode);
1110 if (IS_ERR(inode))
1111 goto err;
1112 ret = -ENOMEM;
1113 state = nfs4_get_open_state(inode, data->owner);
1114 if (state == NULL)
1115 goto err_put_inode;
1116 if (data->o_res.delegation_type != 0) {
1117 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1118 int delegation_flags = 0;
1119
1120 rcu_read_lock();
1121 delegation = rcu_dereference(NFS_I(inode)->delegation);
1122 if (delegation)
1123 delegation_flags = delegation->flags;
1124 rcu_read_unlock();
1125 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1126 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1127 "returning a delegation for "
1128 "OPEN(CLAIM_DELEGATE_CUR)\n",
1129 clp->cl_hostname);
1130 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1131 nfs_inode_set_delegation(state->inode,
1132 data->owner->so_cred,
1133 &data->o_res);
1134 else
1135 nfs_inode_reclaim_delegation(state->inode,
1136 data->owner->so_cred,
1137 &data->o_res);
1138 }
1139
1140 update_open_stateid(state, &data->o_res.stateid, NULL,
1141 data->o_arg.fmode);
1142 iput(inode);
1143out:
1144 return state;
1145err_put_inode:
1146 iput(inode);
1147err:
1148 return ERR_PTR(ret);
1149}
1150
1151static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1152{
1153 struct nfs_inode *nfsi = NFS_I(state->inode);
1154 struct nfs_open_context *ctx;
1155
1156 spin_lock(&state->inode->i_lock);
1157 list_for_each_entry(ctx, &nfsi->open_files, list) {
1158 if (ctx->state != state)
1159 continue;
1160 get_nfs_open_context(ctx);
1161 spin_unlock(&state->inode->i_lock);
1162 return ctx;
1163 }
1164 spin_unlock(&state->inode->i_lock);
1165 return ERR_PTR(-ENOENT);
1166}
1167
1168static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1169{
1170 struct nfs4_opendata *opendata;
1171
1172 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1173 if (opendata == NULL)
1174 return ERR_PTR(-ENOMEM);
1175 opendata->state = state;
1176 atomic_inc(&state->count);
1177 return opendata;
1178}
1179
1180static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1181{
1182 struct nfs4_state *newstate;
1183 int ret;
1184
1185 opendata->o_arg.open_flags = 0;
1186 opendata->o_arg.fmode = fmode;
1187 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1188 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1189 nfs4_init_opendata_res(opendata);
1190 ret = _nfs4_recover_proc_open(opendata);
1191 if (ret != 0)
1192 return ret;
1193 newstate = nfs4_opendata_to_nfs4_state(opendata);
1194 if (IS_ERR(newstate))
1195 return PTR_ERR(newstate);
1196 nfs4_close_state(newstate, fmode);
1197 *res = newstate;
1198 return 0;
1199}
1200
1201static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1202{
1203 struct nfs4_state *newstate;
1204 int ret;
1205
1206 /* memory barrier prior to reading state->n_* */
1207 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1208 smp_rmb();
1209 if (state->n_rdwr != 0) {
1210 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1211 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1212 if (ret != 0)
1213 return ret;
1214 if (newstate != state)
1215 return -ESTALE;
1216 }
1217 if (state->n_wronly != 0) {
1218 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1219 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1220 if (ret != 0)
1221 return ret;
1222 if (newstate != state)
1223 return -ESTALE;
1224 }
1225 if (state->n_rdonly != 0) {
1226 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1227 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1228 if (ret != 0)
1229 return ret;
1230 if (newstate != state)
1231 return -ESTALE;
1232 }
1233 /*
1234 * We may have performed cached opens for all three recoveries.
1235 * Check if we need to update the current stateid.
1236 */
1237 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1238 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1239 write_seqlock(&state->seqlock);
1240 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1241 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1242 write_sequnlock(&state->seqlock);
1243 }
1244 return 0;
1245}
1246
1247/*
1248 * OPEN_RECLAIM:
1249 * reclaim state on the server after a reboot.
1250 */
1251static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1252{
1253 struct nfs_delegation *delegation;
1254 struct nfs4_opendata *opendata;
1255 fmode_t delegation_type = 0;
1256 int status;
1257
1258 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1259 if (IS_ERR(opendata))
1260 return PTR_ERR(opendata);
1261 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1262 opendata->o_arg.fh = NFS_FH(state->inode);
1263 rcu_read_lock();
1264 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1265 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1266 delegation_type = delegation->type;
1267 rcu_read_unlock();
1268 opendata->o_arg.u.delegation_type = delegation_type;
1269 status = nfs4_open_recover(opendata, state);
1270 nfs4_opendata_put(opendata);
1271 return status;
1272}
1273
1274static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1275{
1276 struct nfs_server *server = NFS_SERVER(state->inode);
1277 struct nfs4_exception exception = { };
1278 int err;
1279 do {
1280 err = _nfs4_do_open_reclaim(ctx, state);
1281 if (err != -NFS4ERR_DELAY)
1282 break;
1283 nfs4_handle_exception(server, err, &exception);
1284 } while (exception.retry);
1285 return err;
1286}
1287
1288static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1289{
1290 struct nfs_open_context *ctx;
1291 int ret;
1292
1293 ctx = nfs4_state_find_open_context(state);
1294 if (IS_ERR(ctx))
1295 return PTR_ERR(ctx);
1296 ret = nfs4_do_open_reclaim(ctx, state);
1297 put_nfs_open_context(ctx);
1298 return ret;
1299}
1300
1301static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1302{
1303 struct nfs4_opendata *opendata;
1304 int ret;
1305
1306 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1307 if (IS_ERR(opendata))
1308 return PTR_ERR(opendata);
1309 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1310 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1311 ret = nfs4_open_recover(opendata, state);
1312 nfs4_opendata_put(opendata);
1313 return ret;
1314}
1315
1316int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1317{
1318 struct nfs4_exception exception = { };
1319 struct nfs_server *server = NFS_SERVER(state->inode);
1320 int err;
1321 do {
1322 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1323 switch (err) {
1324 case 0:
1325 case -ENOENT:
1326 case -ESTALE:
1327 goto out;
1328 case -NFS4ERR_BADSESSION:
1329 case -NFS4ERR_BADSLOT:
1330 case -NFS4ERR_BAD_HIGH_SLOT:
1331 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1332 case -NFS4ERR_DEADSESSION:
1333 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1334 goto out;
1335 case -NFS4ERR_STALE_CLIENTID:
1336 case -NFS4ERR_STALE_STATEID:
1337 case -NFS4ERR_EXPIRED:
1338 /* Don't recall a delegation if it was lost */
1339 nfs4_schedule_lease_recovery(server->nfs_client);
1340 goto out;
1341 case -ERESTARTSYS:
1342 /*
1343 * The show must go on: exit, but mark the
1344 * stateid as needing recovery.
1345 */
1346 case -NFS4ERR_DELEG_REVOKED:
1347 case -NFS4ERR_ADMIN_REVOKED:
1348 case -NFS4ERR_BAD_STATEID:
1349 nfs_inode_find_state_and_recover(state->inode,
1350 stateid);
1351 nfs4_schedule_stateid_recovery(server, state);
1352 case -EKEYEXPIRED:
1353 /*
1354 * User RPCSEC_GSS context has expired.
1355 * We cannot recover this stateid now, so
1356 * skip it and allow recovery thread to
1357 * proceed.
1358 */
1359 case -ENOMEM:
1360 err = 0;
1361 goto out;
1362 }
1363 err = nfs4_handle_exception(server, err, &exception);
1364 } while (exception.retry);
1365out:
1366 return err;
1367}
1368
1369static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1370{
1371 struct nfs4_opendata *data = calldata;
1372
1373 data->rpc_status = task->tk_status;
1374 if (data->rpc_status == 0) {
1375 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1376 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1377 renew_lease(data->o_res.server, data->timestamp);
1378 data->rpc_done = 1;
1379 }
1380}
1381
1382static void nfs4_open_confirm_release(void *calldata)
1383{
1384 struct nfs4_opendata *data = calldata;
1385 struct nfs4_state *state = NULL;
1386
1387 /* If this request hasn't been cancelled, do nothing */
1388 if (data->cancelled == 0)
1389 goto out_free;
1390 /* In case of error, no cleanup! */
1391 if (!data->rpc_done)
1392 goto out_free;
1393 state = nfs4_opendata_to_nfs4_state(data);
1394 if (!IS_ERR(state))
1395 nfs4_close_state(state, data->o_arg.fmode);
1396out_free:
1397 nfs4_opendata_put(data);
1398}
1399
1400static const struct rpc_call_ops nfs4_open_confirm_ops = {
1401 .rpc_call_done = nfs4_open_confirm_done,
1402 .rpc_release = nfs4_open_confirm_release,
1403};
1404
1405/*
1406 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1407 */
1408static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1409{
1410 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1411 struct rpc_task *task;
1412 struct rpc_message msg = {
1413 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1414 .rpc_argp = &data->c_arg,
1415 .rpc_resp = &data->c_res,
1416 .rpc_cred = data->owner->so_cred,
1417 };
1418 struct rpc_task_setup task_setup_data = {
1419 .rpc_client = server->client,
1420 .rpc_message = &msg,
1421 .callback_ops = &nfs4_open_confirm_ops,
1422 .callback_data = data,
1423 .workqueue = nfsiod_workqueue,
1424 .flags = RPC_TASK_ASYNC,
1425 };
1426 int status;
1427
1428 kref_get(&data->kref);
1429 data->rpc_done = 0;
1430 data->rpc_status = 0;
1431 data->timestamp = jiffies;
1432 task = rpc_run_task(&task_setup_data);
1433 if (IS_ERR(task))
1434 return PTR_ERR(task);
1435 status = nfs4_wait_for_completion_rpc_task(task);
1436 if (status != 0) {
1437 data->cancelled = 1;
1438 smp_wmb();
1439 } else
1440 status = data->rpc_status;
1441 rpc_put_task(task);
1442 return status;
1443}
1444
1445static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1446{
1447 struct nfs4_opendata *data = calldata;
1448 struct nfs4_state_owner *sp = data->owner;
1449
1450 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1451 return;
1452 /*
1453 * Check if we still need to send an OPEN call, or if we can use
1454 * a delegation instead.
1455 */
1456 if (data->state != NULL) {
1457 struct nfs_delegation *delegation;
1458
1459 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1460 goto out_no_action;
1461 rcu_read_lock();
1462 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1463 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1464 can_open_delegated(delegation, data->o_arg.fmode))
1465 goto unlock_no_action;
1466 rcu_read_unlock();
1467 }
1468 /* Update client id. */
1469 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1470 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1471 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1472 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1473 }
1474 data->timestamp = jiffies;
1475 if (nfs4_setup_sequence(data->o_arg.server,
1476 &data->o_arg.seq_args,
1477 &data->o_res.seq_res, task))
1478 return;
1479 rpc_call_start(task);
1480 return;
1481unlock_no_action:
1482 rcu_read_unlock();
1483out_no_action:
1484 task->tk_action = NULL;
1485
1486}
1487
1488static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1489{
1490 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1491 nfs4_open_prepare(task, calldata);
1492}
1493
1494static void nfs4_open_done(struct rpc_task *task, void *calldata)
1495{
1496 struct nfs4_opendata *data = calldata;
1497
1498 data->rpc_status = task->tk_status;
1499
1500 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1501 return;
1502
1503 if (task->tk_status == 0) {
1504 switch (data->o_res.f_attr->mode & S_IFMT) {
1505 case S_IFREG:
1506 break;
1507 case S_IFLNK:
1508 data->rpc_status = -ELOOP;
1509 break;
1510 case S_IFDIR:
1511 data->rpc_status = -EISDIR;
1512 break;
1513 default:
1514 data->rpc_status = -ENOTDIR;
1515 }
1516 renew_lease(data->o_res.server, data->timestamp);
1517 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1518 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1519 }
1520 data->rpc_done = 1;
1521}
1522
1523static void nfs4_open_release(void *calldata)
1524{
1525 struct nfs4_opendata *data = calldata;
1526 struct nfs4_state *state = NULL;
1527
1528 /* If this request hasn't been cancelled, do nothing */
1529 if (data->cancelled == 0)
1530 goto out_free;
1531 /* In case of error, no cleanup! */
1532 if (data->rpc_status != 0 || !data->rpc_done)
1533 goto out_free;
1534 /* In case we need an open_confirm, no cleanup! */
1535 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1536 goto out_free;
1537 state = nfs4_opendata_to_nfs4_state(data);
1538 if (!IS_ERR(state))
1539 nfs4_close_state(state, data->o_arg.fmode);
1540out_free:
1541 nfs4_opendata_put(data);
1542}
1543
1544static const struct rpc_call_ops nfs4_open_ops = {
1545 .rpc_call_prepare = nfs4_open_prepare,
1546 .rpc_call_done = nfs4_open_done,
1547 .rpc_release = nfs4_open_release,
1548};
1549
1550static const struct rpc_call_ops nfs4_recover_open_ops = {
1551 .rpc_call_prepare = nfs4_recover_open_prepare,
1552 .rpc_call_done = nfs4_open_done,
1553 .rpc_release = nfs4_open_release,
1554};
1555
1556static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1557{
1558 struct inode *dir = data->dir->d_inode;
1559 struct nfs_server *server = NFS_SERVER(dir);
1560 struct nfs_openargs *o_arg = &data->o_arg;
1561 struct nfs_openres *o_res = &data->o_res;
1562 struct rpc_task *task;
1563 struct rpc_message msg = {
1564 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1565 .rpc_argp = o_arg,
1566 .rpc_resp = o_res,
1567 .rpc_cred = data->owner->so_cred,
1568 };
1569 struct rpc_task_setup task_setup_data = {
1570 .rpc_client = server->client,
1571 .rpc_message = &msg,
1572 .callback_ops = &nfs4_open_ops,
1573 .callback_data = data,
1574 .workqueue = nfsiod_workqueue,
1575 .flags = RPC_TASK_ASYNC,
1576 };
1577 int status;
1578
1579 nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1580 kref_get(&data->kref);
1581 data->rpc_done = 0;
1582 data->rpc_status = 0;
1583 data->cancelled = 0;
1584 if (isrecover)
1585 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1586 task = rpc_run_task(&task_setup_data);
1587 if (IS_ERR(task))
1588 return PTR_ERR(task);
1589 status = nfs4_wait_for_completion_rpc_task(task);
1590 if (status != 0) {
1591 data->cancelled = 1;
1592 smp_wmb();
1593 } else
1594 status = data->rpc_status;
1595 rpc_put_task(task);
1596
1597 return status;
1598}
1599
1600static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1601{
1602 struct inode *dir = data->dir->d_inode;
1603 struct nfs_openres *o_res = &data->o_res;
1604 int status;
1605
1606 status = nfs4_run_open_task(data, 1);
1607 if (status != 0 || !data->rpc_done)
1608 return status;
1609
1610 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1611
1612 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1613 status = _nfs4_proc_open_confirm(data);
1614 if (status != 0)
1615 return status;
1616 }
1617
1618 return status;
1619}
1620
1621/*
1622 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1623 */
1624static int _nfs4_proc_open(struct nfs4_opendata *data)
1625{
1626 struct inode *dir = data->dir->d_inode;
1627 struct nfs_server *server = NFS_SERVER(dir);
1628 struct nfs_openargs *o_arg = &data->o_arg;
1629 struct nfs_openres *o_res = &data->o_res;
1630 int status;
1631
1632 status = nfs4_run_open_task(data, 0);
1633 if (!data->rpc_done)
1634 return status;
1635 if (status != 0) {
1636 if (status == -NFS4ERR_BADNAME &&
1637 !(o_arg->open_flags & O_CREAT))
1638 return -ENOENT;
1639 return status;
1640 }
1641
1642 nfs_fattr_map_and_free_names(server, &data->f_attr);
1643
1644 if (o_arg->open_flags & O_CREAT)
1645 update_changeattr(dir, &o_res->cinfo);
1646 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1647 server->caps &= ~NFS_CAP_POSIX_LOCK;
1648 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1649 status = _nfs4_proc_open_confirm(data);
1650 if (status != 0)
1651 return status;
1652 }
1653 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1654 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1655 return 0;
1656}
1657
1658static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1659{
1660 unsigned int loop;
1661 int ret;
1662
1663 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1664 ret = nfs4_wait_clnt_recover(clp);
1665 if (ret != 0)
1666 break;
1667 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1668 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1669 break;
1670 nfs4_schedule_state_manager(clp);
1671 ret = -EIO;
1672 }
1673 return ret;
1674}
1675
1676static int nfs4_recover_expired_lease(struct nfs_server *server)
1677{
1678 return nfs4_client_recover_expired_lease(server->nfs_client);
1679}
1680
1681/*
1682 * OPEN_EXPIRED:
1683 * reclaim state on the server after a network partition.
1684 * Assumes caller holds the appropriate lock
1685 */
1686static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1687{
1688 struct nfs4_opendata *opendata;
1689 int ret;
1690
1691 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1692 if (IS_ERR(opendata))
1693 return PTR_ERR(opendata);
1694 ret = nfs4_open_recover(opendata, state);
1695 if (ret == -ESTALE)
1696 d_drop(ctx->dentry);
1697 nfs4_opendata_put(opendata);
1698 return ret;
1699}
1700
1701static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1702{
1703 struct nfs_server *server = NFS_SERVER(state->inode);
1704 struct nfs4_exception exception = { };
1705 int err;
1706
1707 do {
1708 err = _nfs4_open_expired(ctx, state);
1709 switch (err) {
1710 default:
1711 goto out;
1712 case -NFS4ERR_GRACE:
1713 case -NFS4ERR_DELAY:
1714 nfs4_handle_exception(server, err, &exception);
1715 err = 0;
1716 }
1717 } while (exception.retry);
1718out:
1719 return err;
1720}
1721
1722static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1723{
1724 struct nfs_open_context *ctx;
1725 int ret;
1726
1727 ctx = nfs4_state_find_open_context(state);
1728 if (IS_ERR(ctx))
1729 return PTR_ERR(ctx);
1730 ret = nfs4_do_open_expired(ctx, state);
1731 put_nfs_open_context(ctx);
1732 return ret;
1733}
1734
1735#if defined(CONFIG_NFS_V4_1)
1736static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1737{
1738 int status = NFS_OK;
1739 struct nfs_server *server = NFS_SERVER(state->inode);
1740
1741 if (state->flags & flags) {
1742 status = nfs41_test_stateid(server, stateid);
1743 if (status != NFS_OK) {
1744 nfs41_free_stateid(server, stateid);
1745 state->flags &= ~flags;
1746 }
1747 }
1748 return status;
1749}
1750
1751static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1752{
1753 int deleg_status, open_status;
1754 int deleg_flags = 1 << NFS_DELEGATED_STATE;
1755 int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1756
1757 deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1758 open_status = nfs41_check_expired_stateid(state, &state->open_stateid, open_flags);
1759
1760 if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1761 return NFS_OK;
1762 return nfs4_open_expired(sp, state);
1763}
1764#endif
1765
1766/*
1767 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1768 * fields corresponding to attributes that were used to store the verifier.
1769 * Make sure we clobber those fields in the later setattr call
1770 */
1771static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1772{
1773 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1774 !(sattr->ia_valid & ATTR_ATIME_SET))
1775 sattr->ia_valid |= ATTR_ATIME;
1776
1777 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1778 !(sattr->ia_valid & ATTR_MTIME_SET))
1779 sattr->ia_valid |= ATTR_MTIME;
1780}
1781
1782/*
1783 * Returns a referenced nfs4_state
1784 */
1785static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1786{
1787 struct nfs4_state_owner *sp;
1788 struct nfs4_state *state = NULL;
1789 struct nfs_server *server = NFS_SERVER(dir);
1790 struct nfs4_opendata *opendata;
1791 int status;
1792
1793 /* Protect against reboot recovery conflicts */
1794 status = -ENOMEM;
1795 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1796 if (sp == NULL) {
1797 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1798 goto out_err;
1799 }
1800 status = nfs4_recover_expired_lease(server);
1801 if (status != 0)
1802 goto err_put_state_owner;
1803 if (dentry->d_inode != NULL)
1804 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1805 status = -ENOMEM;
1806 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1807 if (opendata == NULL)
1808 goto err_put_state_owner;
1809
1810 if (dentry->d_inode != NULL)
1811 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1812
1813 status = _nfs4_proc_open(opendata);
1814 if (status != 0)
1815 goto err_opendata_put;
1816
1817 state = nfs4_opendata_to_nfs4_state(opendata);
1818 status = PTR_ERR(state);
1819 if (IS_ERR(state))
1820 goto err_opendata_put;
1821 if (server->caps & NFS_CAP_POSIX_LOCK)
1822 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1823
1824 if (opendata->o_arg.open_flags & O_EXCL) {
1825 nfs4_exclusive_attrset(opendata, sattr);
1826
1827 nfs_fattr_init(opendata->o_res.f_attr);
1828 status = nfs4_do_setattr(state->inode, cred,
1829 opendata->o_res.f_attr, sattr,
1830 state);
1831 if (status == 0)
1832 nfs_setattr_update_inode(state->inode, sattr);
1833 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1834 }
1835 nfs4_opendata_put(opendata);
1836 nfs4_put_state_owner(sp);
1837 *res = state;
1838 return 0;
1839err_opendata_put:
1840 nfs4_opendata_put(opendata);
1841err_put_state_owner:
1842 nfs4_put_state_owner(sp);
1843out_err:
1844 *res = NULL;
1845 return status;
1846}
1847
1848
1849static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1850{
1851 struct nfs4_exception exception = { };
1852 struct nfs4_state *res;
1853 int status;
1854
1855 do {
1856 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1857 if (status == 0)
1858 break;
1859 /* NOTE: BAD_SEQID means the server and client disagree about the
1860 * book-keeping w.r.t. state-changing operations
1861 * (OPEN/CLOSE/LOCK/LOCKU...)
1862 * It is actually a sign of a bug on the client or on the server.
1863 *
1864 * If we receive a BAD_SEQID error in the particular case of
1865 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1866 * have unhashed the old state_owner for us, and that we can
1867 * therefore safely retry using a new one. We should still warn
1868 * the user though...
1869 */
1870 if (status == -NFS4ERR_BAD_SEQID) {
1871 pr_warn_ratelimited("NFS: v4 server %s "
1872 " returned a bad sequence-id error!\n",
1873 NFS_SERVER(dir)->nfs_client->cl_hostname);
1874 exception.retry = 1;
1875 continue;
1876 }
1877 /*
1878 * BAD_STATEID on OPEN means that the server cancelled our
1879 * state before it received the OPEN_CONFIRM.
1880 * Recover by retrying the request as per the discussion
1881 * on Page 181 of RFC3530.
1882 */
1883 if (status == -NFS4ERR_BAD_STATEID) {
1884 exception.retry = 1;
1885 continue;
1886 }
1887 if (status == -EAGAIN) {
1888 /* We must have found a delegation */
1889 exception.retry = 1;
1890 continue;
1891 }
1892 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1893 status, &exception));
1894 } while (exception.retry);
1895 return res;
1896}
1897
1898static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1899 struct nfs_fattr *fattr, struct iattr *sattr,
1900 struct nfs4_state *state)
1901{
1902 struct nfs_server *server = NFS_SERVER(inode);
1903 struct nfs_setattrargs arg = {
1904 .fh = NFS_FH(inode),
1905 .iap = sattr,
1906 .server = server,
1907 .bitmask = server->attr_bitmask,
1908 };
1909 struct nfs_setattrres res = {
1910 .fattr = fattr,
1911 .server = server,
1912 };
1913 struct rpc_message msg = {
1914 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1915 .rpc_argp = &arg,
1916 .rpc_resp = &res,
1917 .rpc_cred = cred,
1918 };
1919 unsigned long timestamp = jiffies;
1920 int status;
1921
1922 nfs_fattr_init(fattr);
1923
1924 if (state != NULL) {
1925 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1926 current->files, current->tgid);
1927 } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1928 FMODE_WRITE)) {
1929 /* Use that stateid */
1930 } else
1931 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1932
1933 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1934 if (status == 0 && state != NULL)
1935 renew_lease(server, timestamp);
1936 return status;
1937}
1938
1939static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1940 struct nfs_fattr *fattr, struct iattr *sattr,
1941 struct nfs4_state *state)
1942{
1943 struct nfs_server *server = NFS_SERVER(inode);
1944 struct nfs4_exception exception = {
1945 .state = state,
1946 .inode = inode,
1947 };
1948 int err;
1949 do {
1950 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1951 switch (err) {
1952 case -NFS4ERR_OPENMODE:
1953 if (state && !(state->state & FMODE_WRITE)) {
1954 err = -EBADF;
1955 if (sattr->ia_valid & ATTR_OPEN)
1956 err = -EACCES;
1957 goto out;
1958 }
1959 }
1960 err = nfs4_handle_exception(server, err, &exception);
1961 } while (exception.retry);
1962out:
1963 return err;
1964}
1965
1966struct nfs4_closedata {
1967 struct inode *inode;
1968 struct nfs4_state *state;
1969 struct nfs_closeargs arg;
1970 struct nfs_closeres res;
1971 struct nfs_fattr fattr;
1972 unsigned long timestamp;
1973 bool roc;
1974 u32 roc_barrier;
1975};
1976
1977static void nfs4_free_closedata(void *data)
1978{
1979 struct nfs4_closedata *calldata = data;
1980 struct nfs4_state_owner *sp = calldata->state->owner;
1981 struct super_block *sb = calldata->state->inode->i_sb;
1982
1983 if (calldata->roc)
1984 pnfs_roc_release(calldata->state->inode);
1985 nfs4_put_open_state(calldata->state);
1986 nfs_free_seqid(calldata->arg.seqid);
1987 nfs4_put_state_owner(sp);
1988 nfs_sb_deactive(sb);
1989 kfree(calldata);
1990}
1991
1992static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1993 fmode_t fmode)
1994{
1995 spin_lock(&state->owner->so_lock);
1996 if (!(fmode & FMODE_READ))
1997 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1998 if (!(fmode & FMODE_WRITE))
1999 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2000 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2001 spin_unlock(&state->owner->so_lock);
2002}
2003
2004static void nfs4_close_done(struct rpc_task *task, void *data)
2005{
2006 struct nfs4_closedata *calldata = data;
2007 struct nfs4_state *state = calldata->state;
2008 struct nfs_server *server = NFS_SERVER(calldata->inode);
2009
2010 dprintk("%s: begin!\n", __func__);
2011 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2012 return;
2013 /* hmm. we are done with the inode, and in the process of freeing
2014 * the state_owner. we keep this around to process errors
2015 */
2016 switch (task->tk_status) {
2017 case 0:
2018 if (calldata->roc)
2019 pnfs_roc_set_barrier(state->inode,
2020 calldata->roc_barrier);
2021 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2022 renew_lease(server, calldata->timestamp);
2023 nfs4_close_clear_stateid_flags(state,
2024 calldata->arg.fmode);
2025 break;
2026 case -NFS4ERR_STALE_STATEID:
2027 case -NFS4ERR_OLD_STATEID:
2028 case -NFS4ERR_BAD_STATEID:
2029 case -NFS4ERR_EXPIRED:
2030 if (calldata->arg.fmode == 0)
2031 break;
2032 default:
2033 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2034 rpc_restart_call_prepare(task);
2035 }
2036 nfs_release_seqid(calldata->arg.seqid);
2037 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2038 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2039}
2040
2041static void nfs4_close_prepare(struct rpc_task *task, void *data)
2042{
2043 struct nfs4_closedata *calldata = data;
2044 struct nfs4_state *state = calldata->state;
2045 int call_close = 0;
2046
2047 dprintk("%s: begin!\n", __func__);
2048 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2049 return;
2050
2051 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2052 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2053 spin_lock(&state->owner->so_lock);
2054 /* Calculate the change in open mode */
2055 if (state->n_rdwr == 0) {
2056 if (state->n_rdonly == 0) {
2057 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2058 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2059 calldata->arg.fmode &= ~FMODE_READ;
2060 }
2061 if (state->n_wronly == 0) {
2062 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2063 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2064 calldata->arg.fmode &= ~FMODE_WRITE;
2065 }
2066 }
2067 spin_unlock(&state->owner->so_lock);
2068
2069 if (!call_close) {
2070 /* Note: exit _without_ calling nfs4_close_done */
2071 task->tk_action = NULL;
2072 goto out;
2073 }
2074
2075 if (calldata->arg.fmode == 0) {
2076 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2077 if (calldata->roc &&
2078 pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2079 rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2080 task, NULL);
2081 goto out;
2082 }
2083 }
2084
2085 nfs_fattr_init(calldata->res.fattr);
2086 calldata->timestamp = jiffies;
2087 if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2088 &calldata->arg.seq_args,
2089 &calldata->res.seq_res,
2090 task))
2091 goto out;
2092 rpc_call_start(task);
2093out:
2094 dprintk("%s: done!\n", __func__);
2095}
2096
2097static const struct rpc_call_ops nfs4_close_ops = {
2098 .rpc_call_prepare = nfs4_close_prepare,
2099 .rpc_call_done = nfs4_close_done,
2100 .rpc_release = nfs4_free_closedata,
2101};
2102
2103/*
2104 * It is possible for data to be read/written from a mem-mapped file
2105 * after the sys_close call (which hits the vfs layer as a flush).
2106 * This means that we can't safely call nfsv4 close on a file until
2107 * the inode is cleared. This in turn means that we are not good
2108 * NFSv4 citizens - we do not indicate to the server to update the file's
2109 * share state even when we are done with one of the three share
2110 * stateid's in the inode.
2111 *
2112 * NOTE: Caller must be holding the sp->so_owner semaphore!
2113 */
2114int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2115{
2116 struct nfs_server *server = NFS_SERVER(state->inode);
2117 struct nfs4_closedata *calldata;
2118 struct nfs4_state_owner *sp = state->owner;
2119 struct rpc_task *task;
2120 struct rpc_message msg = {
2121 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2122 .rpc_cred = state->owner->so_cred,
2123 };
2124 struct rpc_task_setup task_setup_data = {
2125 .rpc_client = server->client,
2126 .rpc_message = &msg,
2127 .callback_ops = &nfs4_close_ops,
2128 .workqueue = nfsiod_workqueue,
2129 .flags = RPC_TASK_ASYNC,
2130 };
2131 int status = -ENOMEM;
2132
2133 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2134 if (calldata == NULL)
2135 goto out;
2136 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2137 calldata->inode = state->inode;
2138 calldata->state = state;
2139 calldata->arg.fh = NFS_FH(state->inode);
2140 calldata->arg.stateid = &state->open_stateid;
2141 /* Serialization for the sequence id */
2142 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2143 if (calldata->arg.seqid == NULL)
2144 goto out_free_calldata;
2145 calldata->arg.fmode = 0;
2146 calldata->arg.bitmask = server->cache_consistency_bitmask;
2147 calldata->res.fattr = &calldata->fattr;
2148 calldata->res.seqid = calldata->arg.seqid;
2149 calldata->res.server = server;
2150 calldata->roc = roc;
2151 nfs_sb_active(calldata->inode->i_sb);
2152
2153 msg.rpc_argp = &calldata->arg;
2154 msg.rpc_resp = &calldata->res;
2155 task_setup_data.callback_data = calldata;
2156 task = rpc_run_task(&task_setup_data);
2157 if (IS_ERR(task))
2158 return PTR_ERR(task);
2159 status = 0;
2160 if (wait)
2161 status = rpc_wait_for_completion_task(task);
2162 rpc_put_task(task);
2163 return status;
2164out_free_calldata:
2165 kfree(calldata);
2166out:
2167 if (roc)
2168 pnfs_roc_release(state->inode);
2169 nfs4_put_open_state(state);
2170 nfs4_put_state_owner(sp);
2171 return status;
2172}
2173
2174static struct inode *
2175nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2176{
2177 struct nfs4_state *state;
2178
2179 /* Protect against concurrent sillydeletes */
2180 state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2181 if (IS_ERR(state))
2182 return ERR_CAST(state);
2183 ctx->state = state;
2184 return igrab(state->inode);
2185}
2186
2187static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2188{
2189 if (ctx->state == NULL)
2190 return;
2191 if (is_sync)
2192 nfs4_close_sync(ctx->state, ctx->mode);
2193 else
2194 nfs4_close_state(ctx->state, ctx->mode);
2195}
2196
2197static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2198{
2199 struct nfs4_server_caps_arg args = {
2200 .fhandle = fhandle,
2201 };
2202 struct nfs4_server_caps_res res = {};
2203 struct rpc_message msg = {
2204 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2205 .rpc_argp = &args,
2206 .rpc_resp = &res,
2207 };
2208 int status;
2209
2210 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2211 if (status == 0) {
2212 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2213 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2214 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2215 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2216 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2217 NFS_CAP_CTIME|NFS_CAP_MTIME);
2218 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2219 server->caps |= NFS_CAP_ACLS;
2220 if (res.has_links != 0)
2221 server->caps |= NFS_CAP_HARDLINKS;
2222 if (res.has_symlinks != 0)
2223 server->caps |= NFS_CAP_SYMLINKS;
2224 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2225 server->caps |= NFS_CAP_FILEID;
2226 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2227 server->caps |= NFS_CAP_MODE;
2228 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2229 server->caps |= NFS_CAP_NLINK;
2230 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2231 server->caps |= NFS_CAP_OWNER;
2232 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2233 server->caps |= NFS_CAP_OWNER_GROUP;
2234 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2235 server->caps |= NFS_CAP_ATIME;
2236 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2237 server->caps |= NFS_CAP_CTIME;
2238 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2239 server->caps |= NFS_CAP_MTIME;
2240
2241 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2242 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2243 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2244 server->acl_bitmask = res.acl_bitmask;
2245 server->fh_expire_type = res.fh_expire_type;
2246 }
2247
2248 return status;
2249}
2250
2251int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2252{
2253 struct nfs4_exception exception = { };
2254 int err;
2255 do {
2256 err = nfs4_handle_exception(server,
2257 _nfs4_server_capabilities(server, fhandle),
2258 &exception);
2259 } while (exception.retry);
2260 return err;
2261}
2262
2263static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2264 struct nfs_fsinfo *info)
2265{
2266 struct nfs4_lookup_root_arg args = {
2267 .bitmask = nfs4_fattr_bitmap,
2268 };
2269 struct nfs4_lookup_res res = {
2270 .server = server,
2271 .fattr = info->fattr,
2272 .fh = fhandle,
2273 };
2274 struct rpc_message msg = {
2275 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2276 .rpc_argp = &args,
2277 .rpc_resp = &res,
2278 };
2279
2280 nfs_fattr_init(info->fattr);
2281 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2282}
2283
2284static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2285 struct nfs_fsinfo *info)
2286{
2287 struct nfs4_exception exception = { };
2288 int err;
2289 do {
2290 err = _nfs4_lookup_root(server, fhandle, info);
2291 switch (err) {
2292 case 0:
2293 case -NFS4ERR_WRONGSEC:
2294 goto out;
2295 default:
2296 err = nfs4_handle_exception(server, err, &exception);
2297 }
2298 } while (exception.retry);
2299out:
2300 return err;
2301}
2302
2303static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2304 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2305{
2306 struct rpc_auth *auth;
2307 int ret;
2308
2309 auth = rpcauth_create(flavor, server->client);
2310 if (!auth) {
2311 ret = -EIO;
2312 goto out;
2313 }
2314 ret = nfs4_lookup_root(server, fhandle, info);
2315out:
2316 return ret;
2317}
2318
2319static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2320 struct nfs_fsinfo *info)
2321{
2322 int i, len, status = 0;
2323 rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2324
2325 len = gss_mech_list_pseudoflavors(&flav_array[0]);
2326 flav_array[len] = RPC_AUTH_NULL;
2327 len += 1;
2328
2329 for (i = 0; i < len; i++) {
2330 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2331 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2332 continue;
2333 break;
2334 }
2335 /*
2336 * -EACCESS could mean that the user doesn't have correct permissions
2337 * to access the mount. It could also mean that we tried to mount
2338 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2339 * existing mount programs don't handle -EACCES very well so it should
2340 * be mapped to -EPERM instead.
2341 */
2342 if (status == -EACCES)
2343 status = -EPERM;
2344 return status;
2345}
2346
2347/*
2348 * get the file handle for the "/" directory on the server
2349 */
2350int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2351 struct nfs_fsinfo *info)
2352{
2353 int minor_version = server->nfs_client->cl_minorversion;
2354 int status = nfs4_lookup_root(server, fhandle, info);
2355 if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2356 /*
2357 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2358 * by nfs4_map_errors() as this function exits.
2359 */
2360 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2361 if (status == 0)
2362 status = nfs4_server_capabilities(server, fhandle);
2363 if (status == 0)
2364 status = nfs4_do_fsinfo(server, fhandle, info);
2365 return nfs4_map_errors(status);
2366}
2367
2368static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2369 struct nfs_fsinfo *info)
2370{
2371 int error;
2372 struct nfs_fattr *fattr = info->fattr;
2373
2374 error = nfs4_server_capabilities(server, mntfh);
2375 if (error < 0) {
2376 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2377 return error;
2378 }
2379
2380 error = nfs4_proc_getattr(server, mntfh, fattr);
2381 if (error < 0) {
2382 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2383 return error;
2384 }
2385
2386 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2387 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2388 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2389
2390 return error;
2391}
2392
2393/*
2394 * Get locations and (maybe) other attributes of a referral.
2395 * Note that we'll actually follow the referral later when
2396 * we detect fsid mismatch in inode revalidation
2397 */
2398static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2399 const struct qstr *name, struct nfs_fattr *fattr,
2400 struct nfs_fh *fhandle)
2401{
2402 int status = -ENOMEM;
2403 struct page *page = NULL;
2404 struct nfs4_fs_locations *locations = NULL;
2405
2406 page = alloc_page(GFP_KERNEL);
2407 if (page == NULL)
2408 goto out;
2409 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2410 if (locations == NULL)
2411 goto out;
2412
2413 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2414 if (status != 0)
2415 goto out;
2416 /* Make sure server returned a different fsid for the referral */
2417 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2418 dprintk("%s: server did not return a different fsid for"
2419 " a referral at %s\n", __func__, name->name);
2420 status = -EIO;
2421 goto out;
2422 }
2423 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2424 nfs_fixup_referral_attributes(&locations->fattr);
2425
2426 /* replace the lookup nfs_fattr with the locations nfs_fattr */
2427 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2428 memset(fhandle, 0, sizeof(struct nfs_fh));
2429out:
2430 if (page)
2431 __free_page(page);
2432 kfree(locations);
2433 return status;
2434}
2435
2436static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2437{
2438 struct nfs4_getattr_arg args = {
2439 .fh = fhandle,
2440 .bitmask = server->attr_bitmask,
2441 };
2442 struct nfs4_getattr_res res = {
2443 .fattr = fattr,
2444 .server = server,
2445 };
2446 struct rpc_message msg = {
2447 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2448 .rpc_argp = &args,
2449 .rpc_resp = &res,
2450 };
2451
2452 nfs_fattr_init(fattr);
2453 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2454}
2455
2456static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2457{
2458 struct nfs4_exception exception = { };
2459 int err;
2460 do {
2461 err = nfs4_handle_exception(server,
2462 _nfs4_proc_getattr(server, fhandle, fattr),
2463 &exception);
2464 } while (exception.retry);
2465 return err;
2466}
2467
2468/*
2469 * The file is not closed if it is opened due to the a request to change
2470 * the size of the file. The open call will not be needed once the
2471 * VFS layer lookup-intents are implemented.
2472 *
2473 * Close is called when the inode is destroyed.
2474 * If we haven't opened the file for O_WRONLY, we
2475 * need to in the size_change case to obtain a stateid.
2476 *
2477 * Got race?
2478 * Because OPEN is always done by name in nfsv4, it is
2479 * possible that we opened a different file by the same
2480 * name. We can recognize this race condition, but we
2481 * can't do anything about it besides returning an error.
2482 *
2483 * This will be fixed with VFS changes (lookup-intent).
2484 */
2485static int
2486nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2487 struct iattr *sattr)
2488{
2489 struct inode *inode = dentry->d_inode;
2490 struct rpc_cred *cred = NULL;
2491 struct nfs4_state *state = NULL;
2492 int status;
2493
2494 if (pnfs_ld_layoutret_on_setattr(inode))
2495 pnfs_return_layout(inode);
2496
2497 nfs_fattr_init(fattr);
2498
2499 /* Search for an existing open(O_WRITE) file */
2500 if (sattr->ia_valid & ATTR_FILE) {
2501 struct nfs_open_context *ctx;
2502
2503 ctx = nfs_file_open_context(sattr->ia_file);
2504 if (ctx) {
2505 cred = ctx->cred;
2506 state = ctx->state;
2507 }
2508 }
2509
2510 /* Deal with open(O_TRUNC) */
2511 if (sattr->ia_valid & ATTR_OPEN)
2512 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2513
2514 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2515 if (status == 0)
2516 nfs_setattr_update_inode(inode, sattr);
2517 return status;
2518}
2519
2520static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2521 const struct qstr *name, struct nfs_fh *fhandle,
2522 struct nfs_fattr *fattr)
2523{
2524 struct nfs_server *server = NFS_SERVER(dir);
2525 int status;
2526 struct nfs4_lookup_arg args = {
2527 .bitmask = server->attr_bitmask,
2528 .dir_fh = NFS_FH(dir),
2529 .name = name,
2530 };
2531 struct nfs4_lookup_res res = {
2532 .server = server,
2533 .fattr = fattr,
2534 .fh = fhandle,
2535 };
2536 struct rpc_message msg = {
2537 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2538 .rpc_argp = &args,
2539 .rpc_resp = &res,
2540 };
2541
2542 nfs_fattr_init(fattr);
2543
2544 dprintk("NFS call lookup %s\n", name->name);
2545 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2546 dprintk("NFS reply lookup: %d\n", status);
2547 return status;
2548}
2549
2550static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2551{
2552 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2553 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2554 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2555 fattr->nlink = 2;
2556}
2557
2558static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2559 struct qstr *name, struct nfs_fh *fhandle,
2560 struct nfs_fattr *fattr)
2561{
2562 struct nfs4_exception exception = { };
2563 struct rpc_clnt *client = *clnt;
2564 int err;
2565 do {
2566 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2567 switch (err) {
2568 case -NFS4ERR_BADNAME:
2569 err = -ENOENT;
2570 goto out;
2571 case -NFS4ERR_MOVED:
2572 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2573 goto out;
2574 case -NFS4ERR_WRONGSEC:
2575 err = -EPERM;
2576 if (client != *clnt)
2577 goto out;
2578
2579 client = nfs4_create_sec_client(client, dir, name);
2580 if (IS_ERR(client))
2581 return PTR_ERR(client);
2582
2583 exception.retry = 1;
2584 break;
2585 default:
2586 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2587 }
2588 } while (exception.retry);
2589
2590out:
2591 if (err == 0)
2592 *clnt = client;
2593 else if (client != *clnt)
2594 rpc_shutdown_client(client);
2595
2596 return err;
2597}
2598
2599static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2600 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2601{
2602 int status;
2603 struct rpc_clnt *client = NFS_CLIENT(dir);
2604
2605 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2606 if (client != NFS_CLIENT(dir)) {
2607 rpc_shutdown_client(client);
2608 nfs_fixup_secinfo_attributes(fattr);
2609 }
2610 return status;
2611}
2612
2613struct rpc_clnt *
2614nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2615 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2616{
2617 int status;
2618 struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2619
2620 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2621 if (status < 0) {
2622 rpc_shutdown_client(client);
2623 return ERR_PTR(status);
2624 }
2625 return client;
2626}
2627
2628static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2629{
2630 struct nfs_server *server = NFS_SERVER(inode);
2631 struct nfs4_accessargs args = {
2632 .fh = NFS_FH(inode),
2633 .bitmask = server->cache_consistency_bitmask,
2634 };
2635 struct nfs4_accessres res = {
2636 .server = server,
2637 };
2638 struct rpc_message msg = {
2639 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2640 .rpc_argp = &args,
2641 .rpc_resp = &res,
2642 .rpc_cred = entry->cred,
2643 };
2644 int mode = entry->mask;
2645 int status;
2646
2647 /*
2648 * Determine which access bits we want to ask for...
2649 */
2650 if (mode & MAY_READ)
2651 args.access |= NFS4_ACCESS_READ;
2652 if (S_ISDIR(inode->i_mode)) {
2653 if (mode & MAY_WRITE)
2654 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2655 if (mode & MAY_EXEC)
2656 args.access |= NFS4_ACCESS_LOOKUP;
2657 } else {
2658 if (mode & MAY_WRITE)
2659 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2660 if (mode & MAY_EXEC)
2661 args.access |= NFS4_ACCESS_EXECUTE;
2662 }
2663
2664 res.fattr = nfs_alloc_fattr();
2665 if (res.fattr == NULL)
2666 return -ENOMEM;
2667
2668 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2669 if (!status) {
2670 entry->mask = 0;
2671 if (res.access & NFS4_ACCESS_READ)
2672 entry->mask |= MAY_READ;
2673 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2674 entry->mask |= MAY_WRITE;
2675 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2676 entry->mask |= MAY_EXEC;
2677 nfs_refresh_inode(inode, res.fattr);
2678 }
2679 nfs_free_fattr(res.fattr);
2680 return status;
2681}
2682
2683static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2684{
2685 struct nfs4_exception exception = { };
2686 int err;
2687 do {
2688 err = nfs4_handle_exception(NFS_SERVER(inode),
2689 _nfs4_proc_access(inode, entry),
2690 &exception);
2691 } while (exception.retry);
2692 return err;
2693}
2694
2695/*
2696 * TODO: For the time being, we don't try to get any attributes
2697 * along with any of the zero-copy operations READ, READDIR,
2698 * READLINK, WRITE.
2699 *
2700 * In the case of the first three, we want to put the GETATTR
2701 * after the read-type operation -- this is because it is hard
2702 * to predict the length of a GETATTR response in v4, and thus
2703 * align the READ data correctly. This means that the GETATTR
2704 * may end up partially falling into the page cache, and we should
2705 * shift it into the 'tail' of the xdr_buf before processing.
2706 * To do this efficiently, we need to know the total length
2707 * of data received, which doesn't seem to be available outside
2708 * of the RPC layer.
2709 *
2710 * In the case of WRITE, we also want to put the GETATTR after
2711 * the operation -- in this case because we want to make sure
2712 * we get the post-operation mtime and size. This means that
2713 * we can't use xdr_encode_pages() as written: we need a variant
2714 * of it which would leave room in the 'tail' iovec.
2715 *
2716 * Both of these changes to the XDR layer would in fact be quite
2717 * minor, but I decided to leave them for a subsequent patch.
2718 */
2719static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2720 unsigned int pgbase, unsigned int pglen)
2721{
2722 struct nfs4_readlink args = {
2723 .fh = NFS_FH(inode),
2724 .pgbase = pgbase,
2725 .pglen = pglen,
2726 .pages = &page,
2727 };
2728 struct nfs4_readlink_res res;
2729 struct rpc_message msg = {
2730 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2731 .rpc_argp = &args,
2732 .rpc_resp = &res,
2733 };
2734
2735 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2736}
2737
2738static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2739 unsigned int pgbase, unsigned int pglen)
2740{
2741 struct nfs4_exception exception = { };
2742 int err;
2743 do {
2744 err = nfs4_handle_exception(NFS_SERVER(inode),
2745 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2746 &exception);
2747 } while (exception.retry);
2748 return err;
2749}
2750
2751/*
2752 * Got race?
2753 * We will need to arrange for the VFS layer to provide an atomic open.
2754 * Until then, this create/open method is prone to inefficiency and race
2755 * conditions due to the lookup, create, and open VFS calls from sys_open()
2756 * placed on the wire.
2757 *
2758 * Given the above sorry state of affairs, I'm simply sending an OPEN.
2759 * The file will be opened again in the subsequent VFS open call
2760 * (nfs4_proc_file_open).
2761 *
2762 * The open for read will just hang around to be used by any process that
2763 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2764 */
2765
2766static int
2767nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2768 int flags, struct nfs_open_context *ctx)
2769{
2770 struct dentry *de = dentry;
2771 struct nfs4_state *state;
2772 struct rpc_cred *cred = NULL;
2773 fmode_t fmode = 0;
2774 int status = 0;
2775
2776 if (ctx != NULL) {
2777 cred = ctx->cred;
2778 de = ctx->dentry;
2779 fmode = ctx->mode;
2780 }
2781 sattr->ia_mode &= ~current_umask();
2782 state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2783 d_drop(dentry);
2784 if (IS_ERR(state)) {
2785 status = PTR_ERR(state);
2786 goto out;
2787 }
2788 d_add(dentry, igrab(state->inode));
2789 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2790 if (ctx != NULL)
2791 ctx->state = state;
2792 else
2793 nfs4_close_sync(state, fmode);
2794out:
2795 return status;
2796}
2797
2798static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2799{
2800 struct nfs_server *server = NFS_SERVER(dir);
2801 struct nfs_removeargs args = {
2802 .fh = NFS_FH(dir),
2803 .name.len = name->len,
2804 .name.name = name->name,
2805 };
2806 struct nfs_removeres res = {
2807 .server = server,
2808 };
2809 struct rpc_message msg = {
2810 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2811 .rpc_argp = &args,
2812 .rpc_resp = &res,
2813 };
2814 int status;
2815
2816 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2817 if (status == 0)
2818 update_changeattr(dir, &res.cinfo);
2819 return status;
2820}
2821
2822static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2823{
2824 struct nfs4_exception exception = { };
2825 int err;
2826 do {
2827 err = nfs4_handle_exception(NFS_SERVER(dir),
2828 _nfs4_proc_remove(dir, name),
2829 &exception);
2830 } while (exception.retry);
2831 return err;
2832}
2833
2834static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2835{
2836 struct nfs_server *server = NFS_SERVER(dir);
2837 struct nfs_removeargs *args = msg->rpc_argp;
2838 struct nfs_removeres *res = msg->rpc_resp;
2839
2840 res->server = server;
2841 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2842 nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2843}
2844
2845static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2846{
2847 if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2848 &data->args.seq_args,
2849 &data->res.seq_res,
2850 task))
2851 return;
2852 rpc_call_start(task);
2853}
2854
2855static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2856{
2857 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2858
2859 if (!nfs4_sequence_done(task, &res->seq_res))
2860 return 0;
2861 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2862 return 0;
2863 update_changeattr(dir, &res->cinfo);
2864 return 1;
2865}
2866
2867static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2868{
2869 struct nfs_server *server = NFS_SERVER(dir);
2870 struct nfs_renameargs *arg = msg->rpc_argp;
2871 struct nfs_renameres *res = msg->rpc_resp;
2872
2873 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2874 res->server = server;
2875 nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2876}
2877
2878static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2879{
2880 if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2881 &data->args.seq_args,
2882 &data->res.seq_res,
2883 task))
2884 return;
2885 rpc_call_start(task);
2886}
2887
2888static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2889 struct inode *new_dir)
2890{
2891 struct nfs_renameres *res = task->tk_msg.rpc_resp;
2892
2893 if (!nfs4_sequence_done(task, &res->seq_res))
2894 return 0;
2895 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2896 return 0;
2897
2898 update_changeattr(old_dir, &res->old_cinfo);
2899 update_changeattr(new_dir, &res->new_cinfo);
2900 return 1;
2901}
2902
2903static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2904 struct inode *new_dir, struct qstr *new_name)
2905{
2906 struct nfs_server *server = NFS_SERVER(old_dir);
2907 struct nfs_renameargs arg = {
2908 .old_dir = NFS_FH(old_dir),
2909 .new_dir = NFS_FH(new_dir),
2910 .old_name = old_name,
2911 .new_name = new_name,
2912 };
2913 struct nfs_renameres res = {
2914 .server = server,
2915 };
2916 struct rpc_message msg = {
2917 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2918 .rpc_argp = &arg,
2919 .rpc_resp = &res,
2920 };
2921 int status = -ENOMEM;
2922
2923 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2924 if (!status) {
2925 update_changeattr(old_dir, &res.old_cinfo);
2926 update_changeattr(new_dir, &res.new_cinfo);
2927 }
2928 return status;
2929}
2930
2931static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2932 struct inode *new_dir, struct qstr *new_name)
2933{
2934 struct nfs4_exception exception = { };
2935 int err;
2936 do {
2937 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2938 _nfs4_proc_rename(old_dir, old_name,
2939 new_dir, new_name),
2940 &exception);
2941 } while (exception.retry);
2942 return err;
2943}
2944
2945static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2946{
2947 struct nfs_server *server = NFS_SERVER(inode);
2948 struct nfs4_link_arg arg = {
2949 .fh = NFS_FH(inode),
2950 .dir_fh = NFS_FH(dir),
2951 .name = name,
2952 .bitmask = server->attr_bitmask,
2953 };
2954 struct nfs4_link_res res = {
2955 .server = server,
2956 };
2957 struct rpc_message msg = {
2958 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2959 .rpc_argp = &arg,
2960 .rpc_resp = &res,
2961 };
2962 int status = -ENOMEM;
2963
2964 res.fattr = nfs_alloc_fattr();
2965 if (res.fattr == NULL)
2966 goto out;
2967
2968 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2969 if (!status) {
2970 update_changeattr(dir, &res.cinfo);
2971 nfs_post_op_update_inode(inode, res.fattr);
2972 }
2973out:
2974 nfs_free_fattr(res.fattr);
2975 return status;
2976}
2977
2978static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2979{
2980 struct nfs4_exception exception = { };
2981 int err;
2982 do {
2983 err = nfs4_handle_exception(NFS_SERVER(inode),
2984 _nfs4_proc_link(inode, dir, name),
2985 &exception);
2986 } while (exception.retry);
2987 return err;
2988}
2989
2990struct nfs4_createdata {
2991 struct rpc_message msg;
2992 struct nfs4_create_arg arg;
2993 struct nfs4_create_res res;
2994 struct nfs_fh fh;
2995 struct nfs_fattr fattr;
2996};
2997
2998static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2999 struct qstr *name, struct iattr *sattr, u32 ftype)
3000{
3001 struct nfs4_createdata *data;
3002
3003 data = kzalloc(sizeof(*data), GFP_KERNEL);
3004 if (data != NULL) {
3005 struct nfs_server *server = NFS_SERVER(dir);
3006
3007 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3008 data->msg.rpc_argp = &data->arg;
3009 data->msg.rpc_resp = &data->res;
3010 data->arg.dir_fh = NFS_FH(dir);
3011 data->arg.server = server;
3012 data->arg.name = name;
3013 data->arg.attrs = sattr;
3014 data->arg.ftype = ftype;
3015 data->arg.bitmask = server->attr_bitmask;
3016 data->res.server = server;
3017 data->res.fh = &data->fh;
3018 data->res.fattr = &data->fattr;
3019 nfs_fattr_init(data->res.fattr);
3020 }
3021 return data;
3022}
3023
3024static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3025{
3026 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3027 &data->arg.seq_args, &data->res.seq_res, 1);
3028 if (status == 0) {
3029 update_changeattr(dir, &data->res.dir_cinfo);
3030 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3031 }
3032 return status;
3033}
3034
3035static void nfs4_free_createdata(struct nfs4_createdata *data)
3036{
3037 kfree(data);
3038}
3039
3040static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3041 struct page *page, unsigned int len, struct iattr *sattr)
3042{
3043 struct nfs4_createdata *data;
3044 int status = -ENAMETOOLONG;
3045
3046 if (len > NFS4_MAXPATHLEN)
3047 goto out;
3048
3049 status = -ENOMEM;
3050 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3051 if (data == NULL)
3052 goto out;
3053
3054 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3055 data->arg.u.symlink.pages = &page;
3056 data->arg.u.symlink.len = len;
3057
3058 status = nfs4_do_create(dir, dentry, data);
3059
3060 nfs4_free_createdata(data);
3061out:
3062 return status;
3063}
3064
3065static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3066 struct page *page, unsigned int len, struct iattr *sattr)
3067{
3068 struct nfs4_exception exception = { };
3069 int err;
3070 do {
3071 err = nfs4_handle_exception(NFS_SERVER(dir),
3072 _nfs4_proc_symlink(dir, dentry, page,
3073 len, sattr),
3074 &exception);
3075 } while (exception.retry);
3076 return err;
3077}
3078
3079static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3080 struct iattr *sattr)
3081{
3082 struct nfs4_createdata *data;
3083 int status = -ENOMEM;
3084
3085 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3086 if (data == NULL)
3087 goto out;
3088
3089 status = nfs4_do_create(dir, dentry, data);
3090
3091 nfs4_free_createdata(data);
3092out:
3093 return status;
3094}
3095
3096static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3097 struct iattr *sattr)
3098{
3099 struct nfs4_exception exception = { };
3100 int err;
3101
3102 sattr->ia_mode &= ~current_umask();
3103 do {
3104 err = nfs4_handle_exception(NFS_SERVER(dir),
3105 _nfs4_proc_mkdir(dir, dentry, sattr),
3106 &exception);
3107 } while (exception.retry);
3108 return err;
3109}
3110
3111static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3112 u64 cookie, struct page **pages, unsigned int count, int plus)
3113{
3114 struct inode *dir = dentry->d_inode;
3115 struct nfs4_readdir_arg args = {
3116 .fh = NFS_FH(dir),
3117 .pages = pages,
3118 .pgbase = 0,
3119 .count = count,
3120 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3121 .plus = plus,
3122 };
3123 struct nfs4_readdir_res res;
3124 struct rpc_message msg = {
3125 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3126 .rpc_argp = &args,
3127 .rpc_resp = &res,
3128 .rpc_cred = cred,
3129 };
3130 int status;
3131
3132 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3133 dentry->d_parent->d_name.name,
3134 dentry->d_name.name,
3135 (unsigned long long)cookie);
3136 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3137 res.pgbase = args.pgbase;
3138 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3139 if (status >= 0) {
3140 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3141 status += args.pgbase;
3142 }
3143
3144 nfs_invalidate_atime(dir);
3145
3146 dprintk("%s: returns %d\n", __func__, status);
3147 return status;
3148}
3149
3150static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3151 u64 cookie, struct page **pages, unsigned int count, int plus)
3152{
3153 struct nfs4_exception exception = { };
3154 int err;
3155 do {
3156 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3157 _nfs4_proc_readdir(dentry, cred, cookie,
3158 pages, count, plus),
3159 &exception);
3160 } while (exception.retry);
3161 return err;
3162}
3163
3164static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3165 struct iattr *sattr, dev_t rdev)
3166{
3167 struct nfs4_createdata *data;
3168 int mode = sattr->ia_mode;
3169 int status = -ENOMEM;
3170
3171 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3172 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3173
3174 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3175 if (data == NULL)
3176 goto out;
3177
3178 if (S_ISFIFO(mode))
3179 data->arg.ftype = NF4FIFO;
3180 else if (S_ISBLK(mode)) {
3181 data->arg.ftype = NF4BLK;
3182 data->arg.u.device.specdata1 = MAJOR(rdev);
3183 data->arg.u.device.specdata2 = MINOR(rdev);
3184 }
3185 else if (S_ISCHR(mode)) {
3186 data->arg.ftype = NF4CHR;
3187 data->arg.u.device.specdata1 = MAJOR(rdev);
3188 data->arg.u.device.specdata2 = MINOR(rdev);
3189 }
3190
3191 status = nfs4_do_create(dir, dentry, data);
3192
3193 nfs4_free_createdata(data);
3194out:
3195 return status;
3196}
3197
3198static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3199 struct iattr *sattr, dev_t rdev)
3200{
3201 struct nfs4_exception exception = { };
3202 int err;
3203
3204 sattr->ia_mode &= ~current_umask();
3205 do {
3206 err = nfs4_handle_exception(NFS_SERVER(dir),
3207 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3208 &exception);
3209 } while (exception.retry);
3210 return err;
3211}
3212
3213static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3214 struct nfs_fsstat *fsstat)
3215{
3216 struct nfs4_statfs_arg args = {
3217 .fh = fhandle,
3218 .bitmask = server->attr_bitmask,
3219 };
3220 struct nfs4_statfs_res res = {
3221 .fsstat = fsstat,
3222 };
3223 struct rpc_message msg = {
3224 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3225 .rpc_argp = &args,
3226 .rpc_resp = &res,
3227 };
3228
3229 nfs_fattr_init(fsstat->fattr);
3230 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3231}
3232
3233static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3234{
3235 struct nfs4_exception exception = { };
3236 int err;
3237 do {
3238 err = nfs4_handle_exception(server,
3239 _nfs4_proc_statfs(server, fhandle, fsstat),
3240 &exception);
3241 } while (exception.retry);
3242 return err;
3243}
3244
3245static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3246 struct nfs_fsinfo *fsinfo)
3247{
3248 struct nfs4_fsinfo_arg args = {
3249 .fh = fhandle,
3250 .bitmask = server->attr_bitmask,
3251 };
3252 struct nfs4_fsinfo_res res = {
3253 .fsinfo = fsinfo,
3254 };
3255 struct rpc_message msg = {
3256 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3257 .rpc_argp = &args,
3258 .rpc_resp = &res,
3259 };
3260
3261 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3262}
3263
3264static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3265{
3266 struct nfs4_exception exception = { };
3267 int err;
3268
3269 do {
3270 err = nfs4_handle_exception(server,
3271 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3272 &exception);
3273 } while (exception.retry);
3274 return err;
3275}
3276
3277static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3278{
3279 nfs_fattr_init(fsinfo->fattr);
3280 return nfs4_do_fsinfo(server, fhandle, fsinfo);
3281}
3282
3283static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3284 struct nfs_pathconf *pathconf)
3285{
3286 struct nfs4_pathconf_arg args = {
3287 .fh = fhandle,
3288 .bitmask = server->attr_bitmask,
3289 };
3290 struct nfs4_pathconf_res res = {
3291 .pathconf = pathconf,
3292 };
3293 struct rpc_message msg = {
3294 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3295 .rpc_argp = &args,
3296 .rpc_resp = &res,
3297 };
3298
3299 /* None of the pathconf attributes are mandatory to implement */
3300 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3301 memset(pathconf, 0, sizeof(*pathconf));
3302 return 0;
3303 }
3304
3305 nfs_fattr_init(pathconf->fattr);
3306 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3307}
3308
3309static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3310 struct nfs_pathconf *pathconf)
3311{
3312 struct nfs4_exception exception = { };
3313 int err;
3314
3315 do {
3316 err = nfs4_handle_exception(server,
3317 _nfs4_proc_pathconf(server, fhandle, pathconf),
3318 &exception);
3319 } while (exception.retry);
3320 return err;
3321}
3322
3323void __nfs4_read_done_cb(struct nfs_read_data *data)
3324{
3325 nfs_invalidate_atime(data->header->inode);
3326}
3327
3328static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3329{
3330 struct nfs_server *server = NFS_SERVER(data->header->inode);
3331
3332 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3333 rpc_restart_call_prepare(task);
3334 return -EAGAIN;
3335 }
3336
3337 __nfs4_read_done_cb(data);
3338 if (task->tk_status > 0)
3339 renew_lease(server, data->timestamp);
3340 return 0;
3341}
3342
3343static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3344{
3345
3346 dprintk("--> %s\n", __func__);
3347
3348 if (!nfs4_sequence_done(task, &data->res.seq_res))
3349 return -EAGAIN;
3350
3351 return data->read_done_cb ? data->read_done_cb(task, data) :
3352 nfs4_read_done_cb(task, data);
3353}
3354
3355static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3356{
3357 data->timestamp = jiffies;
3358 data->read_done_cb = nfs4_read_done_cb;
3359 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3360 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3361}
3362
3363static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3364{
3365 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3366 &data->args.seq_args,
3367 &data->res.seq_res,
3368 task))
3369 return;
3370 rpc_call_start(task);
3371}
3372
3373static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3374{
3375 struct inode *inode = data->header->inode;
3376
3377 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3378 rpc_restart_call_prepare(task);
3379 return -EAGAIN;
3380 }
3381 if (task->tk_status >= 0) {
3382 renew_lease(NFS_SERVER(inode), data->timestamp);
3383 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3384 }
3385 return 0;
3386}
3387
3388static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3389{
3390 if (!nfs4_sequence_done(task, &data->res.seq_res))
3391 return -EAGAIN;
3392 return data->write_done_cb ? data->write_done_cb(task, data) :
3393 nfs4_write_done_cb(task, data);
3394}
3395
3396static
3397bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3398{
3399 const struct nfs_pgio_header *hdr = data->header;
3400
3401 /* Don't request attributes for pNFS or O_DIRECT writes */
3402 if (data->ds_clp != NULL || hdr->dreq != NULL)
3403 return false;
3404 /* Otherwise, request attributes if and only if we don't hold
3405 * a delegation
3406 */
3407 return nfs_have_delegation(hdr->inode, FMODE_READ) == 0;
3408}
3409
3410static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3411{
3412 struct nfs_server *server = NFS_SERVER(data->header->inode);
3413
3414 if (!nfs4_write_need_cache_consistency_data(data)) {
3415 data->args.bitmask = NULL;
3416 data->res.fattr = NULL;
3417 } else
3418 data->args.bitmask = server->cache_consistency_bitmask;
3419
3420 if (!data->write_done_cb)
3421 data->write_done_cb = nfs4_write_done_cb;
3422 data->res.server = server;
3423 data->timestamp = jiffies;
3424
3425 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3426 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3427}
3428
3429static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3430{
3431 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3432 &data->args.seq_args,
3433 &data->res.seq_res,
3434 task))
3435 return;
3436 rpc_call_start(task);
3437}
3438
3439static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3440{
3441 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3442 &data->args.seq_args,
3443 &data->res.seq_res,
3444 task))
3445 return;
3446 rpc_call_start(task);
3447}
3448
3449static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3450{
3451 struct inode *inode = data->inode;
3452
3453 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3454 rpc_restart_call_prepare(task);
3455 return -EAGAIN;
3456 }
3457 return 0;
3458}
3459
3460static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3461{
3462 if (!nfs4_sequence_done(task, &data->res.seq_res))
3463 return -EAGAIN;
3464 return data->commit_done_cb(task, data);
3465}
3466
3467static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3468{
3469 struct nfs_server *server = NFS_SERVER(data->inode);
3470
3471 if (data->commit_done_cb == NULL)
3472 data->commit_done_cb = nfs4_commit_done_cb;
3473 data->res.server = server;
3474 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3475 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3476}
3477
3478struct nfs4_renewdata {
3479 struct nfs_client *client;
3480 unsigned long timestamp;
3481};
3482
3483/*
3484 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3485 * standalone procedure for queueing an asynchronous RENEW.
3486 */
3487static void nfs4_renew_release(void *calldata)
3488{
3489 struct nfs4_renewdata *data = calldata;
3490 struct nfs_client *clp = data->client;
3491
3492 if (atomic_read(&clp->cl_count) > 1)
3493 nfs4_schedule_state_renewal(clp);
3494 nfs_put_client(clp);
3495 kfree(data);
3496}
3497
3498static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3499{
3500 struct nfs4_renewdata *data = calldata;
3501 struct nfs_client *clp = data->client;
3502 unsigned long timestamp = data->timestamp;
3503
3504 if (task->tk_status < 0) {
3505 /* Unless we're shutting down, schedule state recovery! */
3506 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3507 return;
3508 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3509 nfs4_schedule_lease_recovery(clp);
3510 return;
3511 }
3512 nfs4_schedule_path_down_recovery(clp);
3513 }
3514 do_renew_lease(clp, timestamp);
3515}
3516
3517static const struct rpc_call_ops nfs4_renew_ops = {
3518 .rpc_call_done = nfs4_renew_done,
3519 .rpc_release = nfs4_renew_release,
3520};
3521
3522static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3523{
3524 struct rpc_message msg = {
3525 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3526 .rpc_argp = clp,
3527 .rpc_cred = cred,
3528 };
3529 struct nfs4_renewdata *data;
3530
3531 if (renew_flags == 0)
3532 return 0;
3533 if (!atomic_inc_not_zero(&clp->cl_count))
3534 return -EIO;
3535 data = kmalloc(sizeof(*data), GFP_NOFS);
3536 if (data == NULL)
3537 return -ENOMEM;
3538 data->client = clp;
3539 data->timestamp = jiffies;
3540 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3541 &nfs4_renew_ops, data);
3542}
3543
3544static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3545{
3546 struct rpc_message msg = {
3547 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3548 .rpc_argp = clp,
3549 .rpc_cred = cred,
3550 };
3551 unsigned long now = jiffies;
3552 int status;
3553
3554 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3555 if (status < 0)
3556 return status;
3557 do_renew_lease(clp, now);
3558 return 0;
3559}
3560
3561static inline int nfs4_server_supports_acls(struct nfs_server *server)
3562{
3563 return (server->caps & NFS_CAP_ACLS)
3564 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3565 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3566}
3567
3568/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3569 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3570 * the stack.
3571 */
3572#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3573
3574static int buf_to_pages_noslab(const void *buf, size_t buflen,
3575 struct page **pages, unsigned int *pgbase)
3576{
3577 struct page *newpage, **spages;
3578 int rc = 0;
3579 size_t len;
3580 spages = pages;
3581
3582 do {
3583 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3584 newpage = alloc_page(GFP_KERNEL);
3585
3586 if (newpage == NULL)
3587 goto unwind;
3588 memcpy(page_address(newpage), buf, len);
3589 buf += len;
3590 buflen -= len;
3591 *pages++ = newpage;
3592 rc++;
3593 } while (buflen != 0);
3594
3595 return rc;
3596
3597unwind:
3598 for(; rc > 0; rc--)
3599 __free_page(spages[rc-1]);
3600 return -ENOMEM;
3601}
3602
3603struct nfs4_cached_acl {
3604 int cached;
3605 size_t len;
3606 char data[0];
3607};
3608
3609static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3610{
3611 struct nfs_inode *nfsi = NFS_I(inode);
3612
3613 spin_lock(&inode->i_lock);
3614 kfree(nfsi->nfs4_acl);
3615 nfsi->nfs4_acl = acl;
3616 spin_unlock(&inode->i_lock);
3617}
3618
3619static void nfs4_zap_acl_attr(struct inode *inode)
3620{
3621 nfs4_set_cached_acl(inode, NULL);
3622}
3623
3624static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3625{
3626 struct nfs_inode *nfsi = NFS_I(inode);
3627 struct nfs4_cached_acl *acl;
3628 int ret = -ENOENT;
3629
3630 spin_lock(&inode->i_lock);
3631 acl = nfsi->nfs4_acl;
3632 if (acl == NULL)
3633 goto out;
3634 if (buf == NULL) /* user is just asking for length */
3635 goto out_len;
3636 if (acl->cached == 0)
3637 goto out;
3638 ret = -ERANGE; /* see getxattr(2) man page */
3639 if (acl->len > buflen)
3640 goto out;
3641 memcpy(buf, acl->data, acl->len);
3642out_len:
3643 ret = acl->len;
3644out:
3645 spin_unlock(&inode->i_lock);
3646 return ret;
3647}
3648
3649static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3650{
3651 struct nfs4_cached_acl *acl;
3652
3653 if (pages && acl_len <= PAGE_SIZE) {
3654 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3655 if (acl == NULL)
3656 goto out;
3657 acl->cached = 1;
3658 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3659 } else {
3660 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3661 if (acl == NULL)
3662 goto out;
3663 acl->cached = 0;
3664 }
3665 acl->len = acl_len;
3666out:
3667 nfs4_set_cached_acl(inode, acl);
3668}
3669
3670/*
3671 * The getxattr API returns the required buffer length when called with a
3672 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3673 * the required buf. On a NULL buf, we send a page of data to the server
3674 * guessing that the ACL request can be serviced by a page. If so, we cache
3675 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3676 * the cache. If not so, we throw away the page, and cache the required
3677 * length. The next getxattr call will then produce another round trip to
3678 * the server, this time with the input buf of the required size.
3679 */
3680static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3681{
3682 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3683 struct nfs_getaclargs args = {
3684 .fh = NFS_FH(inode),
3685 .acl_pages = pages,
3686 .acl_len = buflen,
3687 };
3688 struct nfs_getaclres res = {
3689 .acl_len = buflen,
3690 };
3691 struct rpc_message msg = {
3692 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3693 .rpc_argp = &args,
3694 .rpc_resp = &res,
3695 };
3696 int ret = -ENOMEM, npages, i, acl_len = 0;
3697
3698 npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3699 /* As long as we're doing a round trip to the server anyway,
3700 * let's be prepared for a page of acl data. */
3701 if (npages == 0)
3702 npages = 1;
3703
3704 /* Add an extra page to handle the bitmap returned */
3705 npages++;
3706
3707 for (i = 0; i < npages; i++) {
3708 pages[i] = alloc_page(GFP_KERNEL);
3709 if (!pages[i])
3710 goto out_free;
3711 }
3712
3713 /* for decoding across pages */
3714 res.acl_scratch = alloc_page(GFP_KERNEL);
3715 if (!res.acl_scratch)
3716 goto out_free;
3717
3718 args.acl_len = npages * PAGE_SIZE;
3719 args.acl_pgbase = 0;
3720
3721 /* Let decode_getfacl know not to fail if the ACL data is larger than
3722 * the page we send as a guess */
3723 if (buf == NULL)
3724 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3725
3726 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
3727 __func__, buf, buflen, npages, args.acl_len);
3728 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3729 &msg, &args.seq_args, &res.seq_res, 0);
3730 if (ret)
3731 goto out_free;
3732
3733 acl_len = res.acl_len - res.acl_data_offset;
3734 if (acl_len > args.acl_len)
3735 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3736 else
3737 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3738 acl_len);
3739 if (buf) {
3740 ret = -ERANGE;
3741 if (acl_len > buflen)
3742 goto out_free;
3743 _copy_from_pages(buf, pages, res.acl_data_offset,
3744 acl_len);
3745 }
3746 ret = acl_len;
3747out_free:
3748 for (i = 0; i < npages; i++)
3749 if (pages[i])
3750 __free_page(pages[i]);
3751 if (res.acl_scratch)
3752 __free_page(res.acl_scratch);
3753 return ret;
3754}
3755
3756static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3757{
3758 struct nfs4_exception exception = { };
3759 ssize_t ret;
3760 do {
3761 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3762 if (ret >= 0)
3763 break;
3764 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3765 } while (exception.retry);
3766 return ret;
3767}
3768
3769static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3770{
3771 struct nfs_server *server = NFS_SERVER(inode);
3772 int ret;
3773
3774 if (!nfs4_server_supports_acls(server))
3775 return -EOPNOTSUPP;
3776 ret = nfs_revalidate_inode(server, inode);
3777 if (ret < 0)
3778 return ret;
3779 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3780 nfs_zap_acl_cache(inode);
3781 ret = nfs4_read_cached_acl(inode, buf, buflen);
3782 if (ret != -ENOENT)
3783 /* -ENOENT is returned if there is no ACL or if there is an ACL
3784 * but no cached acl data, just the acl length */
3785 return ret;
3786 return nfs4_get_acl_uncached(inode, buf, buflen);
3787}
3788
3789static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3790{
3791 struct nfs_server *server = NFS_SERVER(inode);
3792 struct page *pages[NFS4ACL_MAXPAGES];
3793 struct nfs_setaclargs arg = {
3794 .fh = NFS_FH(inode),
3795 .acl_pages = pages,
3796 .acl_len = buflen,
3797 };
3798 struct nfs_setaclres res;
3799 struct rpc_message msg = {
3800 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3801 .rpc_argp = &arg,
3802 .rpc_resp = &res,
3803 };
3804 int ret, i;
3805
3806 if (!nfs4_server_supports_acls(server))
3807 return -EOPNOTSUPP;
3808 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3809 if (i < 0)
3810 return i;
3811 nfs_inode_return_delegation(inode);
3812 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3813
3814 /*
3815 * Free each page after tx, so the only ref left is
3816 * held by the network stack
3817 */
3818 for (; i > 0; i--)
3819 put_page(pages[i-1]);
3820
3821 /*
3822 * Acl update can result in inode attribute update.
3823 * so mark the attribute cache invalid.
3824 */
3825 spin_lock(&inode->i_lock);
3826 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3827 spin_unlock(&inode->i_lock);
3828 nfs_access_zap_cache(inode);
3829 nfs_zap_acl_cache(inode);
3830 return ret;
3831}
3832
3833static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3834{
3835 struct nfs4_exception exception = { };
3836 int err;
3837 do {
3838 err = nfs4_handle_exception(NFS_SERVER(inode),
3839 __nfs4_proc_set_acl(inode, buf, buflen),
3840 &exception);
3841 } while (exception.retry);
3842 return err;
3843}
3844
3845static int
3846nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3847{
3848 struct nfs_client *clp = server->nfs_client;
3849
3850 if (task->tk_status >= 0)
3851 return 0;
3852 switch(task->tk_status) {
3853 case -NFS4ERR_DELEG_REVOKED:
3854 case -NFS4ERR_ADMIN_REVOKED:
3855 case -NFS4ERR_BAD_STATEID:
3856 if (state == NULL)
3857 break;
3858 nfs_remove_bad_delegation(state->inode);
3859 case -NFS4ERR_OPENMODE:
3860 if (state == NULL)
3861 break;
3862 nfs4_schedule_stateid_recovery(server, state);
3863 goto wait_on_recovery;
3864 case -NFS4ERR_EXPIRED:
3865 if (state != NULL)
3866 nfs4_schedule_stateid_recovery(server, state);
3867 case -NFS4ERR_STALE_STATEID:
3868 case -NFS4ERR_STALE_CLIENTID:
3869 nfs4_schedule_lease_recovery(clp);
3870 goto wait_on_recovery;
3871#if defined(CONFIG_NFS_V4_1)
3872 case -NFS4ERR_BADSESSION:
3873 case -NFS4ERR_BADSLOT:
3874 case -NFS4ERR_BAD_HIGH_SLOT:
3875 case -NFS4ERR_DEADSESSION:
3876 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3877 case -NFS4ERR_SEQ_FALSE_RETRY:
3878 case -NFS4ERR_SEQ_MISORDERED:
3879 dprintk("%s ERROR %d, Reset session\n", __func__,
3880 task->tk_status);
3881 nfs4_schedule_session_recovery(clp->cl_session);
3882 task->tk_status = 0;
3883 return -EAGAIN;
3884#endif /* CONFIG_NFS_V4_1 */
3885 case -NFS4ERR_DELAY:
3886 nfs_inc_server_stats(server, NFSIOS_DELAY);
3887 case -NFS4ERR_GRACE:
3888 case -EKEYEXPIRED:
3889 rpc_delay(task, NFS4_POLL_RETRY_MAX);
3890 task->tk_status = 0;
3891 return -EAGAIN;
3892 case -NFS4ERR_RETRY_UNCACHED_REP:
3893 case -NFS4ERR_OLD_STATEID:
3894 task->tk_status = 0;
3895 return -EAGAIN;
3896 }
3897 task->tk_status = nfs4_map_errors(task->tk_status);
3898 return 0;
3899wait_on_recovery:
3900 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3901 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3902 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3903 task->tk_status = 0;
3904 return -EAGAIN;
3905}
3906
3907static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3908 nfs4_verifier *bootverf)
3909{
3910 __be32 verf[2];
3911
3912 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3913 /* An impossible timestamp guarantees this value
3914 * will never match a generated boot time. */
3915 verf[0] = 0;
3916 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3917 } else {
3918 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3919 verf[0] = (__be32)nn->boot_time.tv_sec;
3920 verf[1] = (__be32)nn->boot_time.tv_nsec;
3921 }
3922 memcpy(bootverf->data, verf, sizeof(bootverf->data));
3923}
3924
3925int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3926 unsigned short port, struct rpc_cred *cred,
3927 struct nfs4_setclientid_res *res)
3928{
3929 nfs4_verifier sc_verifier;
3930 struct nfs4_setclientid setclientid = {
3931 .sc_verifier = &sc_verifier,
3932 .sc_prog = program,
3933 .sc_cb_ident = clp->cl_cb_ident,
3934 };
3935 struct rpc_message msg = {
3936 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3937 .rpc_argp = &setclientid,
3938 .rpc_resp = res,
3939 .rpc_cred = cred,
3940 };
3941 int loop = 0;
3942 int status;
3943
3944 nfs4_init_boot_verifier(clp, &sc_verifier);
3945
3946 for(;;) {
3947 rcu_read_lock();
3948 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3949 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3950 clp->cl_ipaddr,
3951 rpc_peeraddr2str(clp->cl_rpcclient,
3952 RPC_DISPLAY_ADDR),
3953 rpc_peeraddr2str(clp->cl_rpcclient,
3954 RPC_DISPLAY_PROTO),
3955 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3956 clp->cl_id_uniquifier);
3957 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3958 sizeof(setclientid.sc_netid),
3959 rpc_peeraddr2str(clp->cl_rpcclient,
3960 RPC_DISPLAY_NETID));
3961 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3962 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3963 clp->cl_ipaddr, port >> 8, port & 255);
3964 rcu_read_unlock();
3965
3966 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3967 if (status != -NFS4ERR_CLID_INUSE)
3968 break;
3969 if (loop != 0) {
3970 ++clp->cl_id_uniquifier;
3971 break;
3972 }
3973 ++loop;
3974 ssleep(clp->cl_lease_time / HZ + 1);
3975 }
3976 return status;
3977}
3978
3979int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3980 struct nfs4_setclientid_res *arg,
3981 struct rpc_cred *cred)
3982{
3983 struct nfs_fsinfo fsinfo;
3984 struct rpc_message msg = {
3985 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3986 .rpc_argp = arg,
3987 .rpc_resp = &fsinfo,
3988 .rpc_cred = cred,
3989 };
3990 unsigned long now;
3991 int status;
3992
3993 now = jiffies;
3994 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3995 if (status == 0) {
3996 spin_lock(&clp->cl_lock);
3997 clp->cl_lease_time = fsinfo.lease_time * HZ;
3998 clp->cl_last_renewal = now;
3999 spin_unlock(&clp->cl_lock);
4000 }
4001 return status;
4002}
4003
4004struct nfs4_delegreturndata {
4005 struct nfs4_delegreturnargs args;
4006 struct nfs4_delegreturnres res;
4007 struct nfs_fh fh;
4008 nfs4_stateid stateid;
4009 unsigned long timestamp;
4010 struct nfs_fattr fattr;
4011 int rpc_status;
4012};
4013
4014static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4015{
4016 struct nfs4_delegreturndata *data = calldata;
4017
4018 if (!nfs4_sequence_done(task, &data->res.seq_res))
4019 return;
4020
4021 switch (task->tk_status) {
4022 case -NFS4ERR_STALE_STATEID:
4023 case -NFS4ERR_EXPIRED:
4024 case 0:
4025 renew_lease(data->res.server, data->timestamp);
4026 break;
4027 default:
4028 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4029 -EAGAIN) {
4030 rpc_restart_call_prepare(task);
4031 return;
4032 }
4033 }
4034 data->rpc_status = task->tk_status;
4035}
4036
4037static void nfs4_delegreturn_release(void *calldata)
4038{
4039 kfree(calldata);
4040}
4041
4042#if defined(CONFIG_NFS_V4_1)
4043static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4044{
4045 struct nfs4_delegreturndata *d_data;
4046
4047 d_data = (struct nfs4_delegreturndata *)data;
4048
4049 if (nfs4_setup_sequence(d_data->res.server,
4050 &d_data->args.seq_args,
4051 &d_data->res.seq_res, task))
4052 return;
4053 rpc_call_start(task);
4054}
4055#endif /* CONFIG_NFS_V4_1 */
4056
4057static const struct rpc_call_ops nfs4_delegreturn_ops = {
4058#if defined(CONFIG_NFS_V4_1)
4059 .rpc_call_prepare = nfs4_delegreturn_prepare,
4060#endif /* CONFIG_NFS_V4_1 */
4061 .rpc_call_done = nfs4_delegreturn_done,
4062 .rpc_release = nfs4_delegreturn_release,
4063};
4064
4065static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4066{
4067 struct nfs4_delegreturndata *data;
4068 struct nfs_server *server = NFS_SERVER(inode);
4069 struct rpc_task *task;
4070 struct rpc_message msg = {
4071 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4072 .rpc_cred = cred,
4073 };
4074 struct rpc_task_setup task_setup_data = {
4075 .rpc_client = server->client,
4076 .rpc_message = &msg,
4077 .callback_ops = &nfs4_delegreturn_ops,
4078 .flags = RPC_TASK_ASYNC,
4079 };
4080 int status = 0;
4081
4082 data = kzalloc(sizeof(*data), GFP_NOFS);
4083 if (data == NULL)
4084 return -ENOMEM;
4085 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4086 data->args.fhandle = &data->fh;
4087 data->args.stateid = &data->stateid;
4088 data->args.bitmask = server->cache_consistency_bitmask;
4089 nfs_copy_fh(&data->fh, NFS_FH(inode));
4090 nfs4_stateid_copy(&data->stateid, stateid);
4091 data->res.fattr = &data->fattr;
4092 data->res.server = server;
4093 nfs_fattr_init(data->res.fattr);
4094 data->timestamp = jiffies;
4095 data->rpc_status = 0;
4096
4097 task_setup_data.callback_data = data;
4098 msg.rpc_argp = &data->args;
4099 msg.rpc_resp = &data->res;
4100 task = rpc_run_task(&task_setup_data);
4101 if (IS_ERR(task))
4102 return PTR_ERR(task);
4103 if (!issync)
4104 goto out;
4105 status = nfs4_wait_for_completion_rpc_task(task);
4106 if (status != 0)
4107 goto out;
4108 status = data->rpc_status;
4109 if (status == 0)
4110 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4111 else
4112 nfs_refresh_inode(inode, &data->fattr);
4113out:
4114 rpc_put_task(task);
4115 return status;
4116}
4117
4118int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4119{
4120 struct nfs_server *server = NFS_SERVER(inode);
4121 struct nfs4_exception exception = { };
4122 int err;
4123 do {
4124 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4125 switch (err) {
4126 case -NFS4ERR_STALE_STATEID:
4127 case -NFS4ERR_EXPIRED:
4128 case 0:
4129 return 0;
4130 }
4131 err = nfs4_handle_exception(server, err, &exception);
4132 } while (exception.retry);
4133 return err;
4134}
4135
4136#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4137#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4138
4139/*
4140 * sleep, with exponential backoff, and retry the LOCK operation.
4141 */
4142static unsigned long
4143nfs4_set_lock_task_retry(unsigned long timeout)
4144{
4145 freezable_schedule_timeout_killable(timeout);
4146 timeout <<= 1;
4147 if (timeout > NFS4_LOCK_MAXTIMEOUT)
4148 return NFS4_LOCK_MAXTIMEOUT;
4149 return timeout;
4150}
4151
4152static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4153{
4154 struct inode *inode = state->inode;
4155 struct nfs_server *server = NFS_SERVER(inode);
4156 struct nfs_client *clp = server->nfs_client;
4157 struct nfs_lockt_args arg = {
4158 .fh = NFS_FH(inode),
4159 .fl = request,
4160 };
4161 struct nfs_lockt_res res = {
4162 .denied = request,
4163 };
4164 struct rpc_message msg = {
4165 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4166 .rpc_argp = &arg,
4167 .rpc_resp = &res,
4168 .rpc_cred = state->owner->so_cred,
4169 };
4170 struct nfs4_lock_state *lsp;
4171 int status;
4172
4173 arg.lock_owner.clientid = clp->cl_clientid;
4174 status = nfs4_set_lock_state(state, request);
4175 if (status != 0)
4176 goto out;
4177 lsp = request->fl_u.nfs4_fl.owner;
4178 arg.lock_owner.id = lsp->ls_seqid.owner_id;
4179 arg.lock_owner.s_dev = server->s_dev;
4180 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4181 switch (status) {
4182 case 0:
4183 request->fl_type = F_UNLCK;
4184 break;
4185 case -NFS4ERR_DENIED:
4186 status = 0;
4187 }
4188 request->fl_ops->fl_release_private(request);
4189out:
4190 return status;
4191}
4192
4193static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4194{
4195 struct nfs4_exception exception = { };
4196 int err;
4197
4198 do {
4199 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4200 _nfs4_proc_getlk(state, cmd, request),
4201 &exception);
4202 } while (exception.retry);
4203 return err;
4204}
4205
4206static int do_vfs_lock(struct file *file, struct file_lock *fl)
4207{
4208 int res = 0;
4209 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4210 case FL_POSIX:
4211 res = posix_lock_file_wait(file, fl);
4212 break;
4213 case FL_FLOCK:
4214 res = flock_lock_file_wait(file, fl);
4215 break;
4216 default:
4217 BUG();
4218 }
4219 return res;
4220}
4221
4222struct nfs4_unlockdata {
4223 struct nfs_locku_args arg;
4224 struct nfs_locku_res res;
4225 struct nfs4_lock_state *lsp;
4226 struct nfs_open_context *ctx;
4227 struct file_lock fl;
4228 const struct nfs_server *server;
4229 unsigned long timestamp;
4230};
4231
4232static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4233 struct nfs_open_context *ctx,
4234 struct nfs4_lock_state *lsp,
4235 struct nfs_seqid *seqid)
4236{
4237 struct nfs4_unlockdata *p;
4238 struct inode *inode = lsp->ls_state->inode;
4239
4240 p = kzalloc(sizeof(*p), GFP_NOFS);
4241 if (p == NULL)
4242 return NULL;
4243 p->arg.fh = NFS_FH(inode);
4244 p->arg.fl = &p->fl;
4245 p->arg.seqid = seqid;
4246 p->res.seqid = seqid;
4247 p->arg.stateid = &lsp->ls_stateid;
4248 p->lsp = lsp;
4249 atomic_inc(&lsp->ls_count);
4250 /* Ensure we don't close file until we're done freeing locks! */
4251 p->ctx = get_nfs_open_context(ctx);
4252 memcpy(&p->fl, fl, sizeof(p->fl));
4253 p->server = NFS_SERVER(inode);
4254 return p;
4255}
4256
4257static void nfs4_locku_release_calldata(void *data)
4258{
4259 struct nfs4_unlockdata *calldata = data;
4260 nfs_free_seqid(calldata->arg.seqid);
4261 nfs4_put_lock_state(calldata->lsp);
4262 put_nfs_open_context(calldata->ctx);
4263 kfree(calldata);
4264}
4265
4266static void nfs4_locku_done(struct rpc_task *task, void *data)
4267{
4268 struct nfs4_unlockdata *calldata = data;
4269
4270 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4271 return;
4272 switch (task->tk_status) {
4273 case 0:
4274 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4275 &calldata->res.stateid);
4276 renew_lease(calldata->server, calldata->timestamp);
4277 break;
4278 case -NFS4ERR_BAD_STATEID:
4279 case -NFS4ERR_OLD_STATEID:
4280 case -NFS4ERR_STALE_STATEID:
4281 case -NFS4ERR_EXPIRED:
4282 break;
4283 default:
4284 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4285 rpc_restart_call_prepare(task);
4286 }
4287}
4288
4289static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4290{
4291 struct nfs4_unlockdata *calldata = data;
4292
4293 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4294 return;
4295 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4296 /* Note: exit _without_ running nfs4_locku_done */
4297 task->tk_action = NULL;
4298 return;
4299 }
4300 calldata->timestamp = jiffies;
4301 if (nfs4_setup_sequence(calldata->server,
4302 &calldata->arg.seq_args,
4303 &calldata->res.seq_res, task))
4304 return;
4305 rpc_call_start(task);
4306}
4307
4308static const struct rpc_call_ops nfs4_locku_ops = {
4309 .rpc_call_prepare = nfs4_locku_prepare,
4310 .rpc_call_done = nfs4_locku_done,
4311 .rpc_release = nfs4_locku_release_calldata,
4312};
4313
4314static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4315 struct nfs_open_context *ctx,
4316 struct nfs4_lock_state *lsp,
4317 struct nfs_seqid *seqid)
4318{
4319 struct nfs4_unlockdata *data;
4320 struct rpc_message msg = {
4321 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4322 .rpc_cred = ctx->cred,
4323 };
4324 struct rpc_task_setup task_setup_data = {
4325 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4326 .rpc_message = &msg,
4327 .callback_ops = &nfs4_locku_ops,
4328 .workqueue = nfsiod_workqueue,
4329 .flags = RPC_TASK_ASYNC,
4330 };
4331
4332 /* Ensure this is an unlock - when canceling a lock, the
4333 * canceled lock is passed in, and it won't be an unlock.
4334 */
4335 fl->fl_type = F_UNLCK;
4336
4337 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4338 if (data == NULL) {
4339 nfs_free_seqid(seqid);
4340 return ERR_PTR(-ENOMEM);
4341 }
4342
4343 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4344 msg.rpc_argp = &data->arg;
4345 msg.rpc_resp = &data->res;
4346 task_setup_data.callback_data = data;
4347 return rpc_run_task(&task_setup_data);
4348}
4349
4350static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4351{
4352 struct nfs_inode *nfsi = NFS_I(state->inode);
4353 struct nfs_seqid *seqid;
4354 struct nfs4_lock_state *lsp;
4355 struct rpc_task *task;
4356 int status = 0;
4357 unsigned char fl_flags = request->fl_flags;
4358
4359 status = nfs4_set_lock_state(state, request);
4360 /* Unlock _before_ we do the RPC call */
4361 request->fl_flags |= FL_EXISTS;
4362 down_read(&nfsi->rwsem);
4363 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4364 up_read(&nfsi->rwsem);
4365 goto out;
4366 }
4367 up_read(&nfsi->rwsem);
4368 if (status != 0)
4369 goto out;
4370 /* Is this a delegated lock? */
4371 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4372 goto out;
4373 lsp = request->fl_u.nfs4_fl.owner;
4374 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4375 status = -ENOMEM;
4376 if (seqid == NULL)
4377 goto out;
4378 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4379 status = PTR_ERR(task);
4380 if (IS_ERR(task))
4381 goto out;
4382 status = nfs4_wait_for_completion_rpc_task(task);
4383 rpc_put_task(task);
4384out:
4385 request->fl_flags = fl_flags;
4386 return status;
4387}
4388
4389struct nfs4_lockdata {
4390 struct nfs_lock_args arg;
4391 struct nfs_lock_res res;
4392 struct nfs4_lock_state *lsp;
4393 struct nfs_open_context *ctx;
4394 struct file_lock fl;
4395 unsigned long timestamp;
4396 int rpc_status;
4397 int cancelled;
4398 struct nfs_server *server;
4399};
4400
4401static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4402 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4403 gfp_t gfp_mask)
4404{
4405 struct nfs4_lockdata *p;
4406 struct inode *inode = lsp->ls_state->inode;
4407 struct nfs_server *server = NFS_SERVER(inode);
4408
4409 p = kzalloc(sizeof(*p), gfp_mask);
4410 if (p == NULL)
4411 return NULL;
4412
4413 p->arg.fh = NFS_FH(inode);
4414 p->arg.fl = &p->fl;
4415 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4416 if (p->arg.open_seqid == NULL)
4417 goto out_free;
4418 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4419 if (p->arg.lock_seqid == NULL)
4420 goto out_free_seqid;
4421 p->arg.lock_stateid = &lsp->ls_stateid;
4422 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4423 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4424 p->arg.lock_owner.s_dev = server->s_dev;
4425 p->res.lock_seqid = p->arg.lock_seqid;
4426 p->lsp = lsp;
4427 p->server = server;
4428 atomic_inc(&lsp->ls_count);
4429 p->ctx = get_nfs_open_context(ctx);
4430 memcpy(&p->fl, fl, sizeof(p->fl));
4431 return p;
4432out_free_seqid:
4433 nfs_free_seqid(p->arg.open_seqid);
4434out_free:
4435 kfree(p);
4436 return NULL;
4437}
4438
4439static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4440{
4441 struct nfs4_lockdata *data = calldata;
4442 struct nfs4_state *state = data->lsp->ls_state;
4443
4444 dprintk("%s: begin!\n", __func__);
4445 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4446 return;
4447 /* Do we need to do an open_to_lock_owner? */
4448 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4449 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4450 return;
4451 data->arg.open_stateid = &state->stateid;
4452 data->arg.new_lock_owner = 1;
4453 data->res.open_seqid = data->arg.open_seqid;
4454 } else
4455 data->arg.new_lock_owner = 0;
4456 data->timestamp = jiffies;
4457 if (nfs4_setup_sequence(data->server,
4458 &data->arg.seq_args,
4459 &data->res.seq_res, task))
4460 return;
4461 rpc_call_start(task);
4462 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4463}
4464
4465static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4466{
4467 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4468 nfs4_lock_prepare(task, calldata);
4469}
4470
4471static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4472{
4473 struct nfs4_lockdata *data = calldata;
4474
4475 dprintk("%s: begin!\n", __func__);
4476
4477 if (!nfs4_sequence_done(task, &data->res.seq_res))
4478 return;
4479
4480 data->rpc_status = task->tk_status;
4481 if (data->arg.new_lock_owner != 0) {
4482 if (data->rpc_status == 0)
4483 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4484 else
4485 goto out;
4486 }
4487 if (data->rpc_status == 0) {
4488 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4489 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4490 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4491 }
4492out:
4493 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4494}
4495
4496static void nfs4_lock_release(void *calldata)
4497{
4498 struct nfs4_lockdata *data = calldata;
4499
4500 dprintk("%s: begin!\n", __func__);
4501 nfs_free_seqid(data->arg.open_seqid);
4502 if (data->cancelled != 0) {
4503 struct rpc_task *task;
4504 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4505 data->arg.lock_seqid);
4506 if (!IS_ERR(task))
4507 rpc_put_task_async(task);
4508 dprintk("%s: cancelling lock!\n", __func__);
4509 } else
4510 nfs_free_seqid(data->arg.lock_seqid);
4511 nfs4_put_lock_state(data->lsp);
4512 put_nfs_open_context(data->ctx);
4513 kfree(data);
4514 dprintk("%s: done!\n", __func__);
4515}
4516
4517static const struct rpc_call_ops nfs4_lock_ops = {
4518 .rpc_call_prepare = nfs4_lock_prepare,
4519 .rpc_call_done = nfs4_lock_done,
4520 .rpc_release = nfs4_lock_release,
4521};
4522
4523static const struct rpc_call_ops nfs4_recover_lock_ops = {
4524 .rpc_call_prepare = nfs4_recover_lock_prepare,
4525 .rpc_call_done = nfs4_lock_done,
4526 .rpc_release = nfs4_lock_release,
4527};
4528
4529static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4530{
4531 switch (error) {
4532 case -NFS4ERR_ADMIN_REVOKED:
4533 case -NFS4ERR_BAD_STATEID:
4534 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4535 if (new_lock_owner != 0 ||
4536 (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4537 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4538 break;
4539 case -NFS4ERR_STALE_STATEID:
4540 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4541 case -NFS4ERR_EXPIRED:
4542 nfs4_schedule_lease_recovery(server->nfs_client);
4543 };
4544}
4545
4546static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4547{
4548 struct nfs4_lockdata *data;
4549 struct rpc_task *task;
4550 struct rpc_message msg = {
4551 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4552 .rpc_cred = state->owner->so_cred,
4553 };
4554 struct rpc_task_setup task_setup_data = {
4555 .rpc_client = NFS_CLIENT(state->inode),
4556 .rpc_message = &msg,
4557 .callback_ops = &nfs4_lock_ops,
4558 .workqueue = nfsiod_workqueue,
4559 .flags = RPC_TASK_ASYNC,
4560 };
4561 int ret;
4562
4563 dprintk("%s: begin!\n", __func__);
4564 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4565 fl->fl_u.nfs4_fl.owner,
4566 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4567 if (data == NULL)
4568 return -ENOMEM;
4569 if (IS_SETLKW(cmd))
4570 data->arg.block = 1;
4571 if (recovery_type > NFS_LOCK_NEW) {
4572 if (recovery_type == NFS_LOCK_RECLAIM)
4573 data->arg.reclaim = NFS_LOCK_RECLAIM;
4574 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4575 }
4576 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4577 msg.rpc_argp = &data->arg;
4578 msg.rpc_resp = &data->res;
4579 task_setup_data.callback_data = data;
4580 task = rpc_run_task(&task_setup_data);
4581 if (IS_ERR(task))
4582 return PTR_ERR(task);
4583 ret = nfs4_wait_for_completion_rpc_task(task);
4584 if (ret == 0) {
4585 ret = data->rpc_status;
4586 if (ret)
4587 nfs4_handle_setlk_error(data->server, data->lsp,
4588 data->arg.new_lock_owner, ret);
4589 } else
4590 data->cancelled = 1;
4591 rpc_put_task(task);
4592 dprintk("%s: done, ret = %d!\n", __func__, ret);
4593 return ret;
4594}
4595
4596static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4597{
4598 struct nfs_server *server = NFS_SERVER(state->inode);
4599 struct nfs4_exception exception = {
4600 .inode = state->inode,
4601 };
4602 int err;
4603
4604 do {
4605 /* Cache the lock if possible... */
4606 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4607 return 0;
4608 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4609 if (err != -NFS4ERR_DELAY)
4610 break;
4611 nfs4_handle_exception(server, err, &exception);
4612 } while (exception.retry);
4613 return err;
4614}
4615
4616static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4617{
4618 struct nfs_server *server = NFS_SERVER(state->inode);
4619 struct nfs4_exception exception = {
4620 .inode = state->inode,
4621 };
4622 int err;
4623
4624 err = nfs4_set_lock_state(state, request);
4625 if (err != 0)
4626 return err;
4627 do {
4628 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4629 return 0;
4630 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4631 switch (err) {
4632 default:
4633 goto out;
4634 case -NFS4ERR_GRACE:
4635 case -NFS4ERR_DELAY:
4636 nfs4_handle_exception(server, err, &exception);
4637 err = 0;
4638 }
4639 } while (exception.retry);
4640out:
4641 return err;
4642}
4643
4644#if defined(CONFIG_NFS_V4_1)
4645static int nfs41_check_expired_locks(struct nfs4_state *state)
4646{
4647 int status, ret = NFS_OK;
4648 struct nfs4_lock_state *lsp;
4649 struct nfs_server *server = NFS_SERVER(state->inode);
4650
4651 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4652 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4653 status = nfs41_test_stateid(server, &lsp->ls_stateid);
4654 if (status != NFS_OK) {
4655 nfs41_free_stateid(server, &lsp->ls_stateid);
4656 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4657 ret = status;
4658 }
4659 }
4660 };
4661
4662 return ret;
4663}
4664
4665static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4666{
4667 int status = NFS_OK;
4668
4669 if (test_bit(LK_STATE_IN_USE, &state->flags))
4670 status = nfs41_check_expired_locks(state);
4671 if (status == NFS_OK)
4672 return status;
4673 return nfs4_lock_expired(state, request);
4674}
4675#endif
4676
4677static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4678{
4679 struct nfs_inode *nfsi = NFS_I(state->inode);
4680 unsigned char fl_flags = request->fl_flags;
4681 int status = -ENOLCK;
4682
4683 if ((fl_flags & FL_POSIX) &&
4684 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4685 goto out;
4686 /* Is this a delegated open? */
4687 status = nfs4_set_lock_state(state, request);
4688 if (status != 0)
4689 goto out;
4690 request->fl_flags |= FL_ACCESS;
4691 status = do_vfs_lock(request->fl_file, request);
4692 if (status < 0)
4693 goto out;
4694 down_read(&nfsi->rwsem);
4695 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4696 /* Yes: cache locks! */
4697 /* ...but avoid races with delegation recall... */
4698 request->fl_flags = fl_flags & ~FL_SLEEP;
4699 status = do_vfs_lock(request->fl_file, request);
4700 goto out_unlock;
4701 }
4702 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4703 if (status != 0)
4704 goto out_unlock;
4705 /* Note: we always want to sleep here! */
4706 request->fl_flags = fl_flags | FL_SLEEP;
4707 if (do_vfs_lock(request->fl_file, request) < 0)
4708 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4709 "manager!\n", __func__);
4710out_unlock:
4711 up_read(&nfsi->rwsem);
4712out:
4713 request->fl_flags = fl_flags;
4714 return status;
4715}
4716
4717static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4718{
4719 struct nfs4_exception exception = {
4720 .state = state,
4721 .inode = state->inode,
4722 };
4723 int err;
4724
4725 do {
4726 err = _nfs4_proc_setlk(state, cmd, request);
4727 if (err == -NFS4ERR_DENIED)
4728 err = -EAGAIN;
4729 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4730 err, &exception);
4731 } while (exception.retry);
4732 return err;
4733}
4734
4735static int
4736nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4737{
4738 struct nfs_open_context *ctx;
4739 struct nfs4_state *state;
4740 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4741 int status;
4742
4743 /* verify open state */
4744 ctx = nfs_file_open_context(filp);
4745 state = ctx->state;
4746
4747 if (request->fl_start < 0 || request->fl_end < 0)
4748 return -EINVAL;
4749
4750 if (IS_GETLK(cmd)) {
4751 if (state != NULL)
4752 return nfs4_proc_getlk(state, F_GETLK, request);
4753 return 0;
4754 }
4755
4756 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4757 return -EINVAL;
4758
4759 if (request->fl_type == F_UNLCK) {
4760 if (state != NULL)
4761 return nfs4_proc_unlck(state, cmd, request);
4762 return 0;
4763 }
4764
4765 if (state == NULL)
4766 return -ENOLCK;
4767 /*
4768 * Don't rely on the VFS having checked the file open mode,
4769 * since it won't do this for flock() locks.
4770 */
4771 switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4772 case F_RDLCK:
4773 if (!(filp->f_mode & FMODE_READ))
4774 return -EBADF;
4775 break;
4776 case F_WRLCK:
4777 if (!(filp->f_mode & FMODE_WRITE))
4778 return -EBADF;
4779 }
4780
4781 do {
4782 status = nfs4_proc_setlk(state, cmd, request);
4783 if ((status != -EAGAIN) || IS_SETLK(cmd))
4784 break;
4785 timeout = nfs4_set_lock_task_retry(timeout);
4786 status = -ERESTARTSYS;
4787 if (signalled())
4788 break;
4789 } while(status < 0);
4790 return status;
4791}
4792
4793int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4794{
4795 struct nfs_server *server = NFS_SERVER(state->inode);
4796 struct nfs4_exception exception = { };
4797 int err;
4798
4799 err = nfs4_set_lock_state(state, fl);
4800 if (err != 0)
4801 goto out;
4802 do {
4803 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4804 switch (err) {
4805 default:
4806 printk(KERN_ERR "NFS: %s: unhandled error "
4807 "%d.\n", __func__, err);
4808 case 0:
4809 case -ESTALE:
4810 goto out;
4811 case -NFS4ERR_EXPIRED:
4812 nfs4_schedule_stateid_recovery(server, state);
4813 case -NFS4ERR_STALE_CLIENTID:
4814 case -NFS4ERR_STALE_STATEID:
4815 nfs4_schedule_lease_recovery(server->nfs_client);
4816 goto out;
4817 case -NFS4ERR_BADSESSION:
4818 case -NFS4ERR_BADSLOT:
4819 case -NFS4ERR_BAD_HIGH_SLOT:
4820 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4821 case -NFS4ERR_DEADSESSION:
4822 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4823 goto out;
4824 case -ERESTARTSYS:
4825 /*
4826 * The show must go on: exit, but mark the
4827 * stateid as needing recovery.
4828 */
4829 case -NFS4ERR_DELEG_REVOKED:
4830 case -NFS4ERR_ADMIN_REVOKED:
4831 case -NFS4ERR_BAD_STATEID:
4832 case -NFS4ERR_OPENMODE:
4833 nfs4_schedule_stateid_recovery(server, state);
4834 err = 0;
4835 goto out;
4836 case -EKEYEXPIRED:
4837 /*
4838 * User RPCSEC_GSS context has expired.
4839 * We cannot recover this stateid now, so
4840 * skip it and allow recovery thread to
4841 * proceed.
4842 */
4843 err = 0;
4844 goto out;
4845 case -ENOMEM:
4846 case -NFS4ERR_DENIED:
4847 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4848 err = 0;
4849 goto out;
4850 case -NFS4ERR_DELAY:
4851 break;
4852 }
4853 err = nfs4_handle_exception(server, err, &exception);
4854 } while (exception.retry);
4855out:
4856 return err;
4857}
4858
4859struct nfs_release_lockowner_data {
4860 struct nfs4_lock_state *lsp;
4861 struct nfs_server *server;
4862 struct nfs_release_lockowner_args args;
4863};
4864
4865static void nfs4_release_lockowner_release(void *calldata)
4866{
4867 struct nfs_release_lockowner_data *data = calldata;
4868 nfs4_free_lock_state(data->server, data->lsp);
4869 kfree(calldata);
4870}
4871
4872static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4873 .rpc_release = nfs4_release_lockowner_release,
4874};
4875
4876int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4877{
4878 struct nfs_server *server = lsp->ls_state->owner->so_server;
4879 struct nfs_release_lockowner_data *data;
4880 struct rpc_message msg = {
4881 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4882 };
4883
4884 if (server->nfs_client->cl_mvops->minor_version != 0)
4885 return -EINVAL;
4886 data = kmalloc(sizeof(*data), GFP_NOFS);
4887 if (!data)
4888 return -ENOMEM;
4889 data->lsp = lsp;
4890 data->server = server;
4891 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4892 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4893 data->args.lock_owner.s_dev = server->s_dev;
4894 msg.rpc_argp = &data->args;
4895 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4896 return 0;
4897}
4898
4899#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4900
4901static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4902 const void *buf, size_t buflen,
4903 int flags, int type)
4904{
4905 if (strcmp(key, "") != 0)
4906 return -EINVAL;
4907
4908 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4909}
4910
4911static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4912 void *buf, size_t buflen, int type)
4913{
4914 if (strcmp(key, "") != 0)
4915 return -EINVAL;
4916
4917 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4918}
4919
4920static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4921 size_t list_len, const char *name,
4922 size_t name_len, int type)
4923{
4924 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4925
4926 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4927 return 0;
4928
4929 if (list && len <= list_len)
4930 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4931 return len;
4932}
4933
4934/*
4935 * nfs_fhget will use either the mounted_on_fileid or the fileid
4936 */
4937static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4938{
4939 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4940 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4941 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4942 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4943 return;
4944
4945 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4946 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4947 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4948 fattr->nlink = 2;
4949}
4950
4951static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4952 const struct qstr *name,
4953 struct nfs4_fs_locations *fs_locations,
4954 struct page *page)
4955{
4956 struct nfs_server *server = NFS_SERVER(dir);
4957 u32 bitmask[2] = {
4958 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4959 };
4960 struct nfs4_fs_locations_arg args = {
4961 .dir_fh = NFS_FH(dir),
4962 .name = name,
4963 .page = page,
4964 .bitmask = bitmask,
4965 };
4966 struct nfs4_fs_locations_res res = {
4967 .fs_locations = fs_locations,
4968 };
4969 struct rpc_message msg = {
4970 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4971 .rpc_argp = &args,
4972 .rpc_resp = &res,
4973 };
4974 int status;
4975
4976 dprintk("%s: start\n", __func__);
4977
4978 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4979 * is not supported */
4980 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4981 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4982 else
4983 bitmask[0] |= FATTR4_WORD0_FILEID;
4984
4985 nfs_fattr_init(&fs_locations->fattr);
4986 fs_locations->server = server;
4987 fs_locations->nlocations = 0;
4988 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
4989 dprintk("%s: returned status = %d\n", __func__, status);
4990 return status;
4991}
4992
4993int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4994 const struct qstr *name,
4995 struct nfs4_fs_locations *fs_locations,
4996 struct page *page)
4997{
4998 struct nfs4_exception exception = { };
4999 int err;
5000 do {
5001 err = nfs4_handle_exception(NFS_SERVER(dir),
5002 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5003 &exception);
5004 } while (exception.retry);
5005 return err;
5006}
5007
5008static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5009{
5010 int status;
5011 struct nfs4_secinfo_arg args = {
5012 .dir_fh = NFS_FH(dir),
5013 .name = name,
5014 };
5015 struct nfs4_secinfo_res res = {
5016 .flavors = flavors,
5017 };
5018 struct rpc_message msg = {
5019 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5020 .rpc_argp = &args,
5021 .rpc_resp = &res,
5022 };
5023
5024 dprintk("NFS call secinfo %s\n", name->name);
5025 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5026 dprintk("NFS reply secinfo: %d\n", status);
5027 return status;
5028}
5029
5030int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5031 struct nfs4_secinfo_flavors *flavors)
5032{
5033 struct nfs4_exception exception = { };
5034 int err;
5035 do {
5036 err = nfs4_handle_exception(NFS_SERVER(dir),
5037 _nfs4_proc_secinfo(dir, name, flavors),
5038 &exception);
5039 } while (exception.retry);
5040 return err;
5041}
5042
5043#ifdef CONFIG_NFS_V4_1
5044/*
5045 * Check the exchange flags returned by the server for invalid flags, having
5046 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5047 * DS flags set.
5048 */
5049static int nfs4_check_cl_exchange_flags(u32 flags)
5050{
5051 if (flags & ~EXCHGID4_FLAG_MASK_R)
5052 goto out_inval;
5053 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5054 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5055 goto out_inval;
5056 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5057 goto out_inval;
5058 return NFS_OK;
5059out_inval:
5060 return -NFS4ERR_INVAL;
5061}
5062
5063static bool
5064nfs41_same_server_scope(struct nfs41_server_scope *a,
5065 struct nfs41_server_scope *b)
5066{
5067 if (a->server_scope_sz == b->server_scope_sz &&
5068 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5069 return true;
5070
5071 return false;
5072}
5073
5074/*
5075 * nfs4_proc_exchange_id()
5076 *
5077 * Since the clientid has expired, all compounds using sessions
5078 * associated with the stale clientid will be returning
5079 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5080 * be in some phase of session reset.
5081 */
5082int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5083{
5084 nfs4_verifier verifier;
5085 struct nfs41_exchange_id_args args = {
5086 .verifier = &verifier,
5087 .client = clp,
5088 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5089 };
5090 struct nfs41_exchange_id_res res = {
5091 .client = clp,
5092 };
5093 int status;
5094 struct rpc_message msg = {
5095 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5096 .rpc_argp = &args,
5097 .rpc_resp = &res,
5098 .rpc_cred = cred,
5099 };
5100
5101 dprintk("--> %s\n", __func__);
5102 BUG_ON(clp == NULL);
5103
5104 nfs4_init_boot_verifier(clp, &verifier);
5105
5106 args.id_len = scnprintf(args.id, sizeof(args.id),
5107 "%s/%s/%u",
5108 clp->cl_ipaddr,
5109 clp->cl_rpcclient->cl_nodename,
5110 clp->cl_rpcclient->cl_auth->au_flavor);
5111
5112 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5113 GFP_KERNEL);
5114 if (unlikely(res.server_scope == NULL)) {
5115 status = -ENOMEM;
5116 goto out;
5117 }
5118
5119 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5120 if (unlikely(res.impl_id == NULL)) {
5121 status = -ENOMEM;
5122 goto out_server_scope;
5123 }
5124
5125 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5126 if (status == 0)
5127 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5128
5129 if (status == 0) {
5130 /* use the most recent implementation id */
5131 kfree(clp->cl_implid);
5132 clp->cl_implid = res.impl_id;
5133 } else
5134 kfree(res.impl_id);
5135
5136 if (status == 0) {
5137 if (clp->cl_serverscope != NULL &&
5138 !nfs41_same_server_scope(clp->cl_serverscope,
5139 res.server_scope)) {
5140 dprintk("%s: server_scope mismatch detected\n",
5141 __func__);
5142 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5143 kfree(clp->cl_serverscope);
5144 clp->cl_serverscope = NULL;
5145 }
5146
5147 if (clp->cl_serverscope == NULL) {
5148 clp->cl_serverscope = res.server_scope;
5149 goto out;
5150 }
5151 }
5152
5153out_server_scope:
5154 kfree(res.server_scope);
5155out:
5156 if (clp->cl_implid != NULL)
5157 dprintk("%s: Server Implementation ID: "
5158 "domain: %s, name: %s, date: %llu,%u\n",
5159 __func__, clp->cl_implid->domain, clp->cl_implid->name,
5160 clp->cl_implid->date.seconds,
5161 clp->cl_implid->date.nseconds);
5162 dprintk("<-- %s status= %d\n", __func__, status);
5163 return status;
5164}
5165
5166struct nfs4_get_lease_time_data {
5167 struct nfs4_get_lease_time_args *args;
5168 struct nfs4_get_lease_time_res *res;
5169 struct nfs_client *clp;
5170};
5171
5172static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5173 void *calldata)
5174{
5175 int ret;
5176 struct nfs4_get_lease_time_data *data =
5177 (struct nfs4_get_lease_time_data *)calldata;
5178
5179 dprintk("--> %s\n", __func__);
5180 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5181 /* just setup sequence, do not trigger session recovery
5182 since we're invoked within one */
5183 ret = nfs41_setup_sequence(data->clp->cl_session,
5184 &data->args->la_seq_args,
5185 &data->res->lr_seq_res, task);
5186
5187 BUG_ON(ret == -EAGAIN);
5188 rpc_call_start(task);
5189 dprintk("<-- %s\n", __func__);
5190}
5191
5192/*
5193 * Called from nfs4_state_manager thread for session setup, so don't recover
5194 * from sequence operation or clientid errors.
5195 */
5196static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5197{
5198 struct nfs4_get_lease_time_data *data =
5199 (struct nfs4_get_lease_time_data *)calldata;
5200
5201 dprintk("--> %s\n", __func__);
5202 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5203 return;
5204 switch (task->tk_status) {
5205 case -NFS4ERR_DELAY:
5206 case -NFS4ERR_GRACE:
5207 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5208 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5209 task->tk_status = 0;
5210 /* fall through */
5211 case -NFS4ERR_RETRY_UNCACHED_REP:
5212 rpc_restart_call_prepare(task);
5213 return;
5214 }
5215 dprintk("<-- %s\n", __func__);
5216}
5217
5218static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5219 .rpc_call_prepare = nfs4_get_lease_time_prepare,
5220 .rpc_call_done = nfs4_get_lease_time_done,
5221};
5222
5223int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5224{
5225 struct rpc_task *task;
5226 struct nfs4_get_lease_time_args args;
5227 struct nfs4_get_lease_time_res res = {
5228 .lr_fsinfo = fsinfo,
5229 };
5230 struct nfs4_get_lease_time_data data = {
5231 .args = &args,
5232 .res = &res,
5233 .clp = clp,
5234 };
5235 struct rpc_message msg = {
5236 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5237 .rpc_argp = &args,
5238 .rpc_resp = &res,
5239 };
5240 struct rpc_task_setup task_setup = {
5241 .rpc_client = clp->cl_rpcclient,
5242 .rpc_message = &msg,
5243 .callback_ops = &nfs4_get_lease_time_ops,
5244 .callback_data = &data,
5245 .flags = RPC_TASK_TIMEOUT,
5246 };
5247 int status;
5248
5249 nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5250 dprintk("--> %s\n", __func__);
5251 task = rpc_run_task(&task_setup);
5252
5253 if (IS_ERR(task))
5254 status = PTR_ERR(task);
5255 else {
5256 status = task->tk_status;
5257 rpc_put_task(task);
5258 }
5259 dprintk("<-- %s return %d\n", __func__, status);
5260
5261 return status;
5262}
5263
5264static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5265{
5266 return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5267}
5268
5269static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5270 struct nfs4_slot *new,
5271 u32 max_slots,
5272 u32 ivalue)
5273{
5274 struct nfs4_slot *old = NULL;
5275 u32 i;
5276
5277 spin_lock(&tbl->slot_tbl_lock);
5278 if (new) {
5279 old = tbl->slots;
5280 tbl->slots = new;
5281 tbl->max_slots = max_slots;
5282 }
5283 tbl->highest_used_slotid = -1; /* no slot is currently used */
5284 for (i = 0; i < tbl->max_slots; i++)
5285 tbl->slots[i].seq_nr = ivalue;
5286 spin_unlock(&tbl->slot_tbl_lock);
5287 kfree(old);
5288}
5289
5290/*
5291 * (re)Initialise a slot table
5292 */
5293static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5294 u32 ivalue)
5295{
5296 struct nfs4_slot *new = NULL;
5297 int ret = -ENOMEM;
5298
5299 dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5300 max_reqs, tbl->max_slots);
5301
5302 /* Does the newly negotiated max_reqs match the existing slot table? */
5303 if (max_reqs != tbl->max_slots) {
5304 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5305 if (!new)
5306 goto out;
5307 }
5308 ret = 0;
5309
5310 nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5311 dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5312 tbl, tbl->slots, tbl->max_slots);
5313out:
5314 dprintk("<-- %s: return %d\n", __func__, ret);
5315 return ret;
5316}
5317
5318/* Destroy the slot table */
5319static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5320{
5321 if (session->fc_slot_table.slots != NULL) {
5322 kfree(session->fc_slot_table.slots);
5323 session->fc_slot_table.slots = NULL;
5324 }
5325 if (session->bc_slot_table.slots != NULL) {
5326 kfree(session->bc_slot_table.slots);
5327 session->bc_slot_table.slots = NULL;
5328 }
5329 return;
5330}
5331
5332/*
5333 * Initialize or reset the forechannel and backchannel tables
5334 */
5335static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5336{
5337 struct nfs4_slot_table *tbl;
5338 int status;
5339
5340 dprintk("--> %s\n", __func__);
5341 /* Fore channel */
5342 tbl = &ses->fc_slot_table;
5343 status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5344 if (status) /* -ENOMEM */
5345 return status;
5346 /* Back channel */
5347 tbl = &ses->bc_slot_table;
5348 status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5349 if (status && tbl->slots == NULL)
5350 /* Fore and back channel share a connection so get
5351 * both slot tables or neither */
5352 nfs4_destroy_slot_tables(ses);
5353 return status;
5354}
5355
5356struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5357{
5358 struct nfs4_session *session;
5359 struct nfs4_slot_table *tbl;
5360
5361 session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5362 if (!session)
5363 return NULL;
5364
5365 tbl = &session->fc_slot_table;
5366 tbl->highest_used_slotid = NFS4_NO_SLOT;
5367 spin_lock_init(&tbl->slot_tbl_lock);
5368 rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5369 init_completion(&tbl->complete);
5370
5371 tbl = &session->bc_slot_table;
5372 tbl->highest_used_slotid = NFS4_NO_SLOT;
5373 spin_lock_init(&tbl->slot_tbl_lock);
5374 rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5375 init_completion(&tbl->complete);
5376
5377 session->session_state = 1<<NFS4_SESSION_INITING;
5378
5379 session->clp = clp;
5380 return session;
5381}
5382
5383void nfs4_destroy_session(struct nfs4_session *session)
5384{
5385 struct rpc_xprt *xprt;
5386
5387 nfs4_proc_destroy_session(session);
5388
5389 rcu_read_lock();
5390 xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5391 rcu_read_unlock();
5392 dprintk("%s Destroy backchannel for xprt %p\n",
5393 __func__, xprt);
5394 xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5395 nfs4_destroy_slot_tables(session);
5396 kfree(session);
5397}
5398
5399/*
5400 * Initialize the values to be used by the client in CREATE_SESSION
5401 * If nfs4_init_session set the fore channel request and response sizes,
5402 * use them.
5403 *
5404 * Set the back channel max_resp_sz_cached to zero to force the client to
5405 * always set csa_cachethis to FALSE because the current implementation
5406 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5407 */
5408static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5409{
5410 struct nfs4_session *session = args->client->cl_session;
5411 unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5412 mxresp_sz = session->fc_attrs.max_resp_sz;
5413
5414 if (mxrqst_sz == 0)
5415 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5416 if (mxresp_sz == 0)
5417 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5418 /* Fore channel attributes */
5419 args->fc_attrs.max_rqst_sz = mxrqst_sz;
5420 args->fc_attrs.max_resp_sz = mxresp_sz;
5421 args->fc_attrs.max_ops = NFS4_MAX_OPS;
5422 args->fc_attrs.max_reqs = max_session_slots;
5423
5424 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5425 "max_ops=%u max_reqs=%u\n",
5426 __func__,
5427 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5428 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5429
5430 /* Back channel attributes */
5431 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5432 args->bc_attrs.max_resp_sz = PAGE_SIZE;
5433 args->bc_attrs.max_resp_sz_cached = 0;
5434 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5435 args->bc_attrs.max_reqs = 1;
5436
5437 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5438 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5439 __func__,
5440 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5441 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5442 args->bc_attrs.max_reqs);
5443}
5444
5445static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5446{
5447 struct nfs4_channel_attrs *sent = &args->fc_attrs;
5448 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5449
5450 if (rcvd->max_resp_sz > sent->max_resp_sz)
5451 return -EINVAL;
5452 /*
5453 * Our requested max_ops is the minimum we need; we're not
5454 * prepared to break up compounds into smaller pieces than that.
5455 * So, no point even trying to continue if the server won't
5456 * cooperate:
5457 */
5458 if (rcvd->max_ops < sent->max_ops)
5459 return -EINVAL;
5460 if (rcvd->max_reqs == 0)
5461 return -EINVAL;
5462 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5463 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5464 return 0;
5465}
5466
5467static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5468{
5469 struct nfs4_channel_attrs *sent = &args->bc_attrs;
5470 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5471
5472 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5473 return -EINVAL;
5474 if (rcvd->max_resp_sz < sent->max_resp_sz)
5475 return -EINVAL;
5476 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5477 return -EINVAL;
5478 /* These would render the backchannel useless: */
5479 if (rcvd->max_ops != sent->max_ops)
5480 return -EINVAL;
5481 if (rcvd->max_reqs != sent->max_reqs)
5482 return -EINVAL;
5483 return 0;
5484}
5485
5486static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5487 struct nfs4_session *session)
5488{
5489 int ret;
5490
5491 ret = nfs4_verify_fore_channel_attrs(args, session);
5492 if (ret)
5493 return ret;
5494 return nfs4_verify_back_channel_attrs(args, session);
5495}
5496
5497static int _nfs4_proc_create_session(struct nfs_client *clp)
5498{
5499 struct nfs4_session *session = clp->cl_session;
5500 struct nfs41_create_session_args args = {
5501 .client = clp,
5502 .cb_program = NFS4_CALLBACK,
5503 };
5504 struct nfs41_create_session_res res = {
5505 .client = clp,
5506 };
5507 struct rpc_message msg = {
5508 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5509 .rpc_argp = &args,
5510 .rpc_resp = &res,
5511 };
5512 int status;
5513
5514 nfs4_init_channel_attrs(&args);
5515 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5516
5517 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5518
5519 if (!status)
5520 /* Verify the session's negotiated channel_attrs values */
5521 status = nfs4_verify_channel_attrs(&args, session);
5522 if (!status) {
5523 /* Increment the clientid slot sequence id */
5524 clp->cl_seqid++;
5525 }
5526
5527 return status;
5528}
5529
5530/*
5531 * Issues a CREATE_SESSION operation to the server.
5532 * It is the responsibility of the caller to verify the session is
5533 * expired before calling this routine.
5534 */
5535int nfs4_proc_create_session(struct nfs_client *clp)
5536{
5537 int status;
5538 unsigned *ptr;
5539 struct nfs4_session *session = clp->cl_session;
5540
5541 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5542
5543 status = _nfs4_proc_create_session(clp);
5544 if (status)
5545 goto out;
5546
5547 /* Init or reset the session slot tables */
5548 status = nfs4_setup_session_slot_tables(session);
5549 dprintk("slot table setup returned %d\n", status);
5550 if (status)
5551 goto out;
5552
5553 ptr = (unsigned *)&session->sess_id.data[0];
5554 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5555 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5556out:
5557 dprintk("<-- %s\n", __func__);
5558 return status;
5559}
5560
5561/*
5562 * Issue the over-the-wire RPC DESTROY_SESSION.
5563 * The caller must serialize access to this routine.
5564 */
5565int nfs4_proc_destroy_session(struct nfs4_session *session)
5566{
5567 int status = 0;
5568 struct rpc_message msg;
5569
5570 dprintk("--> nfs4_proc_destroy_session\n");
5571
5572 /* session is still being setup */
5573 if (session->clp->cl_cons_state != NFS_CS_READY)
5574 return status;
5575
5576 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5577 msg.rpc_argp = session;
5578 msg.rpc_resp = NULL;
5579 msg.rpc_cred = NULL;
5580 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5581
5582 if (status)
5583 printk(KERN_WARNING
5584 "NFS: Got error %d from the server on DESTROY_SESSION. "
5585 "Session has been destroyed regardless...\n", status);
5586
5587 dprintk("<-- nfs4_proc_destroy_session\n");
5588 return status;
5589}
5590
5591int nfs4_init_session(struct nfs_server *server)
5592{
5593 struct nfs_client *clp = server->nfs_client;
5594 struct nfs4_session *session;
5595 unsigned int rsize, wsize;
5596 int ret;
5597
5598 if (!nfs4_has_session(clp))
5599 return 0;
5600
5601 session = clp->cl_session;
5602 if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5603 return 0;
5604
5605 rsize = server->rsize;
5606 if (rsize == 0)
5607 rsize = NFS_MAX_FILE_IO_SIZE;
5608 wsize = server->wsize;
5609 if (wsize == 0)
5610 wsize = NFS_MAX_FILE_IO_SIZE;
5611
5612 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5613 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5614
5615 ret = nfs4_recover_expired_lease(server);
5616 if (!ret)
5617 ret = nfs4_check_client_ready(clp);
5618 return ret;
5619}
5620
5621int nfs4_init_ds_session(struct nfs_client *clp)
5622{
5623 struct nfs4_session *session = clp->cl_session;
5624 int ret;
5625
5626 if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5627 return 0;
5628
5629 ret = nfs4_client_recover_expired_lease(clp);
5630 if (!ret)
5631 /* Test for the DS role */
5632 if (!is_ds_client(clp))
5633 ret = -ENODEV;
5634 if (!ret)
5635 ret = nfs4_check_client_ready(clp);
5636 return ret;
5637
5638}
5639EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5640
5641
5642/*
5643 * Renew the cl_session lease.
5644 */
5645struct nfs4_sequence_data {
5646 struct nfs_client *clp;
5647 struct nfs4_sequence_args args;
5648 struct nfs4_sequence_res res;
5649};
5650
5651static void nfs41_sequence_release(void *data)
5652{
5653 struct nfs4_sequence_data *calldata = data;
5654 struct nfs_client *clp = calldata->clp;
5655
5656 if (atomic_read(&clp->cl_count) > 1)
5657 nfs4_schedule_state_renewal(clp);
5658 nfs_put_client(clp);
5659 kfree(calldata);
5660}
5661
5662static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5663{
5664 switch(task->tk_status) {
5665 case -NFS4ERR_DELAY:
5666 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5667 return -EAGAIN;
5668 default:
5669 nfs4_schedule_lease_recovery(clp);
5670 }
5671 return 0;
5672}
5673
5674static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5675{
5676 struct nfs4_sequence_data *calldata = data;
5677 struct nfs_client *clp = calldata->clp;
5678
5679 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5680 return;
5681
5682 if (task->tk_status < 0) {
5683 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5684 if (atomic_read(&clp->cl_count) == 1)
5685 goto out;
5686
5687 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5688 rpc_restart_call_prepare(task);
5689 return;
5690 }
5691 }
5692 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5693out:
5694 dprintk("<-- %s\n", __func__);
5695}
5696
5697static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5698{
5699 struct nfs4_sequence_data *calldata = data;
5700 struct nfs_client *clp = calldata->clp;
5701 struct nfs4_sequence_args *args;
5702 struct nfs4_sequence_res *res;
5703
5704 args = task->tk_msg.rpc_argp;
5705 res = task->tk_msg.rpc_resp;
5706
5707 if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5708 return;
5709 rpc_call_start(task);
5710}
5711
5712static const struct rpc_call_ops nfs41_sequence_ops = {
5713 .rpc_call_done = nfs41_sequence_call_done,
5714 .rpc_call_prepare = nfs41_sequence_prepare,
5715 .rpc_release = nfs41_sequence_release,
5716};
5717
5718static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5719{
5720 struct nfs4_sequence_data *calldata;
5721 struct rpc_message msg = {
5722 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5723 .rpc_cred = cred,
5724 };
5725 struct rpc_task_setup task_setup_data = {
5726 .rpc_client = clp->cl_rpcclient,
5727 .rpc_message = &msg,
5728 .callback_ops = &nfs41_sequence_ops,
5729 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5730 };
5731
5732 if (!atomic_inc_not_zero(&clp->cl_count))
5733 return ERR_PTR(-EIO);
5734 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5735 if (calldata == NULL) {
5736 nfs_put_client(clp);
5737 return ERR_PTR(-ENOMEM);
5738 }
5739 nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5740 msg.rpc_argp = &calldata->args;
5741 msg.rpc_resp = &calldata->res;
5742 calldata->clp = clp;
5743 task_setup_data.callback_data = calldata;
5744
5745 return rpc_run_task(&task_setup_data);
5746}
5747
5748static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5749{
5750 struct rpc_task *task;
5751 int ret = 0;
5752
5753 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5754 return 0;
5755 task = _nfs41_proc_sequence(clp, cred);
5756 if (IS_ERR(task))
5757 ret = PTR_ERR(task);
5758 else
5759 rpc_put_task_async(task);
5760 dprintk("<-- %s status=%d\n", __func__, ret);
5761 return ret;
5762}
5763
5764static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5765{
5766 struct rpc_task *task;
5767 int ret;
5768
5769 task = _nfs41_proc_sequence(clp, cred);
5770 if (IS_ERR(task)) {
5771 ret = PTR_ERR(task);
5772 goto out;
5773 }
5774 ret = rpc_wait_for_completion_task(task);
5775 if (!ret) {
5776 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5777
5778 if (task->tk_status == 0)
5779 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5780 ret = task->tk_status;
5781 }
5782 rpc_put_task(task);
5783out:
5784 dprintk("<-- %s status=%d\n", __func__, ret);
5785 return ret;
5786}
5787
5788struct nfs4_reclaim_complete_data {
5789 struct nfs_client *clp;
5790 struct nfs41_reclaim_complete_args arg;
5791 struct nfs41_reclaim_complete_res res;
5792};
5793
5794static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5795{
5796 struct nfs4_reclaim_complete_data *calldata = data;
5797
5798 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5799 if (nfs41_setup_sequence(calldata->clp->cl_session,
5800 &calldata->arg.seq_args,
5801 &calldata->res.seq_res, task))
5802 return;
5803
5804 rpc_call_start(task);
5805}
5806
5807static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5808{
5809 switch(task->tk_status) {
5810 case 0:
5811 case -NFS4ERR_COMPLETE_ALREADY:
5812 case -NFS4ERR_WRONG_CRED: /* What to do here? */
5813 break;
5814 case -NFS4ERR_DELAY:
5815 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5816 /* fall through */
5817 case -NFS4ERR_RETRY_UNCACHED_REP:
5818 return -EAGAIN;
5819 default:
5820 nfs4_schedule_lease_recovery(clp);
5821 }
5822 return 0;
5823}
5824
5825static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5826{
5827 struct nfs4_reclaim_complete_data *calldata = data;
5828 struct nfs_client *clp = calldata->clp;
5829 struct nfs4_sequence_res *res = &calldata->res.seq_res;
5830
5831 dprintk("--> %s\n", __func__);
5832 if (!nfs41_sequence_done(task, res))
5833 return;
5834
5835 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5836 rpc_restart_call_prepare(task);
5837 return;
5838 }
5839 dprintk("<-- %s\n", __func__);
5840}
5841
5842static void nfs4_free_reclaim_complete_data(void *data)
5843{
5844 struct nfs4_reclaim_complete_data *calldata = data;
5845
5846 kfree(calldata);
5847}
5848
5849static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5850 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5851 .rpc_call_done = nfs4_reclaim_complete_done,
5852 .rpc_release = nfs4_free_reclaim_complete_data,
5853};
5854
5855/*
5856 * Issue a global reclaim complete.
5857 */
5858static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5859{
5860 struct nfs4_reclaim_complete_data *calldata;
5861 struct rpc_task *task;
5862 struct rpc_message msg = {
5863 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5864 };
5865 struct rpc_task_setup task_setup_data = {
5866 .rpc_client = clp->cl_rpcclient,
5867 .rpc_message = &msg,
5868 .callback_ops = &nfs4_reclaim_complete_call_ops,
5869 .flags = RPC_TASK_ASYNC,
5870 };
5871 int status = -ENOMEM;
5872
5873 dprintk("--> %s\n", __func__);
5874 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5875 if (calldata == NULL)
5876 goto out;
5877 calldata->clp = clp;
5878 calldata->arg.one_fs = 0;
5879
5880 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5881 msg.rpc_argp = &calldata->arg;
5882 msg.rpc_resp = &calldata->res;
5883 task_setup_data.callback_data = calldata;
5884 task = rpc_run_task(&task_setup_data);
5885 if (IS_ERR(task)) {
5886 status = PTR_ERR(task);
5887 goto out;
5888 }
5889 status = nfs4_wait_for_completion_rpc_task(task);
5890 if (status == 0)
5891 status = task->tk_status;
5892 rpc_put_task(task);
5893 return 0;
5894out:
5895 dprintk("<-- %s status=%d\n", __func__, status);
5896 return status;
5897}
5898
5899static void
5900nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5901{
5902 struct nfs4_layoutget *lgp = calldata;
5903 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5904
5905 dprintk("--> %s\n", __func__);
5906 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5907 * right now covering the LAYOUTGET we are about to send.
5908 * However, that is not so catastrophic, and there seems
5909 * to be no way to prevent it completely.
5910 */
5911 if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5912 &lgp->res.seq_res, task))
5913 return;
5914 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5915 NFS_I(lgp->args.inode)->layout,
5916 lgp->args.ctx->state)) {
5917 rpc_exit(task, NFS4_OK);
5918 return;
5919 }
5920 rpc_call_start(task);
5921}
5922
5923static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5924{
5925 struct nfs4_layoutget *lgp = calldata;
5926 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5927
5928 dprintk("--> %s\n", __func__);
5929
5930 if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5931 return;
5932
5933 switch (task->tk_status) {
5934 case 0:
5935 break;
5936 case -NFS4ERR_LAYOUTTRYLATER:
5937 case -NFS4ERR_RECALLCONFLICT:
5938 task->tk_status = -NFS4ERR_DELAY;
5939 /* Fall through */
5940 default:
5941 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5942 rpc_restart_call_prepare(task);
5943 return;
5944 }
5945 }
5946 dprintk("<-- %s\n", __func__);
5947}
5948
5949static void nfs4_layoutget_release(void *calldata)
5950{
5951 struct nfs4_layoutget *lgp = calldata;
5952
5953 dprintk("--> %s\n", __func__);
5954 put_nfs_open_context(lgp->args.ctx);
5955 kfree(calldata);
5956 dprintk("<-- %s\n", __func__);
5957}
5958
5959static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5960 .rpc_call_prepare = nfs4_layoutget_prepare,
5961 .rpc_call_done = nfs4_layoutget_done,
5962 .rpc_release = nfs4_layoutget_release,
5963};
5964
5965int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5966{
5967 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5968 struct rpc_task *task;
5969 struct rpc_message msg = {
5970 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5971 .rpc_argp = &lgp->args,
5972 .rpc_resp = &lgp->res,
5973 };
5974 struct rpc_task_setup task_setup_data = {
5975 .rpc_client = server->client,
5976 .rpc_message = &msg,
5977 .callback_ops = &nfs4_layoutget_call_ops,
5978 .callback_data = lgp,
5979 .flags = RPC_TASK_ASYNC,
5980 };
5981 int status = 0;
5982
5983 dprintk("--> %s\n", __func__);
5984
5985 lgp->res.layoutp = &lgp->args.layout;
5986 lgp->res.seq_res.sr_slot = NULL;
5987 nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
5988 task = rpc_run_task(&task_setup_data);
5989 if (IS_ERR(task))
5990 return PTR_ERR(task);
5991 status = nfs4_wait_for_completion_rpc_task(task);
5992 if (status == 0)
5993 status = task->tk_status;
5994 if (status == 0)
5995 status = pnfs_layout_process(lgp);
5996 rpc_put_task(task);
5997 dprintk("<-- %s status=%d\n", __func__, status);
5998 return status;
5999}
6000
6001static void
6002nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6003{
6004 struct nfs4_layoutreturn *lrp = calldata;
6005
6006 dprintk("--> %s\n", __func__);
6007 if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6008 &lrp->res.seq_res, task))
6009 return;
6010 rpc_call_start(task);
6011}
6012
6013static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6014{
6015 struct nfs4_layoutreturn *lrp = calldata;
6016 struct nfs_server *server;
6017 struct pnfs_layout_hdr *lo = lrp->args.layout;
6018
6019 dprintk("--> %s\n", __func__);
6020
6021 if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6022 return;
6023
6024 server = NFS_SERVER(lrp->args.inode);
6025 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6026 rpc_restart_call_prepare(task);
6027 return;
6028 }
6029 spin_lock(&lo->plh_inode->i_lock);
6030 if (task->tk_status == 0) {
6031 if (lrp->res.lrs_present) {
6032 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6033 } else
6034 BUG_ON(!list_empty(&lo->plh_segs));
6035 }
6036 lo->plh_block_lgets--;
6037 spin_unlock(&lo->plh_inode->i_lock);
6038 dprintk("<-- %s\n", __func__);
6039}
6040
6041static void nfs4_layoutreturn_release(void *calldata)
6042{
6043 struct nfs4_layoutreturn *lrp = calldata;
6044
6045 dprintk("--> %s\n", __func__);
6046 put_layout_hdr(lrp->args.layout);
6047 kfree(calldata);
6048 dprintk("<-- %s\n", __func__);
6049}
6050
6051static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6052 .rpc_call_prepare = nfs4_layoutreturn_prepare,
6053 .rpc_call_done = nfs4_layoutreturn_done,
6054 .rpc_release = nfs4_layoutreturn_release,
6055};
6056
6057int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6058{
6059 struct rpc_task *task;
6060 struct rpc_message msg = {
6061 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6062 .rpc_argp = &lrp->args,
6063 .rpc_resp = &lrp->res,
6064 };
6065 struct rpc_task_setup task_setup_data = {
6066 .rpc_client = lrp->clp->cl_rpcclient,
6067 .rpc_message = &msg,
6068 .callback_ops = &nfs4_layoutreturn_call_ops,
6069 .callback_data = lrp,
6070 };
6071 int status;
6072
6073 dprintk("--> %s\n", __func__);
6074 nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6075 task = rpc_run_task(&task_setup_data);
6076 if (IS_ERR(task))
6077 return PTR_ERR(task);
6078 status = task->tk_status;
6079 dprintk("<-- %s status=%d\n", __func__, status);
6080 rpc_put_task(task);
6081 return status;
6082}
6083
6084/*
6085 * Retrieve the list of Data Server devices from the MDS.
6086 */
6087static int _nfs4_getdevicelist(struct nfs_server *server,
6088 const struct nfs_fh *fh,
6089 struct pnfs_devicelist *devlist)
6090{
6091 struct nfs4_getdevicelist_args args = {
6092 .fh = fh,
6093 .layoutclass = server->pnfs_curr_ld->id,
6094 };
6095 struct nfs4_getdevicelist_res res = {
6096 .devlist = devlist,
6097 };
6098 struct rpc_message msg = {
6099 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6100 .rpc_argp = &args,
6101 .rpc_resp = &res,
6102 };
6103 int status;
6104
6105 dprintk("--> %s\n", __func__);
6106 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6107 &res.seq_res, 0);
6108 dprintk("<-- %s status=%d\n", __func__, status);
6109 return status;
6110}
6111
6112int nfs4_proc_getdevicelist(struct nfs_server *server,
6113 const struct nfs_fh *fh,
6114 struct pnfs_devicelist *devlist)
6115{
6116 struct nfs4_exception exception = { };
6117 int err;
6118
6119 do {
6120 err = nfs4_handle_exception(server,
6121 _nfs4_getdevicelist(server, fh, devlist),
6122 &exception);
6123 } while (exception.retry);
6124
6125 dprintk("%s: err=%d, num_devs=%u\n", __func__,
6126 err, devlist->num_devs);
6127
6128 return err;
6129}
6130EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6131
6132static int
6133_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6134{
6135 struct nfs4_getdeviceinfo_args args = {
6136 .pdev = pdev,
6137 };
6138 struct nfs4_getdeviceinfo_res res = {
6139 .pdev = pdev,
6140 };
6141 struct rpc_message msg = {
6142 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6143 .rpc_argp = &args,
6144 .rpc_resp = &res,
6145 };
6146 int status;
6147
6148 dprintk("--> %s\n", __func__);
6149 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6150 dprintk("<-- %s status=%d\n", __func__, status);
6151
6152 return status;
6153}
6154
6155int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6156{
6157 struct nfs4_exception exception = { };
6158 int err;
6159
6160 do {
6161 err = nfs4_handle_exception(server,
6162 _nfs4_proc_getdeviceinfo(server, pdev),
6163 &exception);
6164 } while (exception.retry);
6165 return err;
6166}
6167EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6168
6169static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6170{
6171 struct nfs4_layoutcommit_data *data = calldata;
6172 struct nfs_server *server = NFS_SERVER(data->args.inode);
6173
6174 if (nfs4_setup_sequence(server, &data->args.seq_args,
6175 &data->res.seq_res, task))
6176 return;
6177 rpc_call_start(task);
6178}
6179
6180static void
6181nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6182{
6183 struct nfs4_layoutcommit_data *data = calldata;
6184 struct nfs_server *server = NFS_SERVER(data->args.inode);
6185
6186 if (!nfs4_sequence_done(task, &data->res.seq_res))
6187 return;
6188
6189 switch (task->tk_status) { /* Just ignore these failures */
6190 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6191 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
6192 case -NFS4ERR_BADLAYOUT: /* no layout */
6193 case -NFS4ERR_GRACE: /* loca_recalim always false */
6194 task->tk_status = 0;
6195 break;
6196 case 0:
6197 nfs_post_op_update_inode_force_wcc(data->args.inode,
6198 data->res.fattr);
6199 break;
6200 default:
6201 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6202 rpc_restart_call_prepare(task);
6203 return;
6204 }
6205 }
6206}
6207
6208static void nfs4_layoutcommit_release(void *calldata)
6209{
6210 struct nfs4_layoutcommit_data *data = calldata;
6211 struct pnfs_layout_segment *lseg, *tmp;
6212 unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6213
6214 pnfs_cleanup_layoutcommit(data);
6215 /* Matched by references in pnfs_set_layoutcommit */
6216 list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6217 list_del_init(&lseg->pls_lc_list);
6218 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6219 &lseg->pls_flags))
6220 put_lseg(lseg);
6221 }
6222
6223 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6224 smp_mb__after_clear_bit();
6225 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6226
6227 put_rpccred(data->cred);
6228 kfree(data);
6229}
6230
6231static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6232 .rpc_call_prepare = nfs4_layoutcommit_prepare,
6233 .rpc_call_done = nfs4_layoutcommit_done,
6234 .rpc_release = nfs4_layoutcommit_release,
6235};
6236
6237int
6238nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6239{
6240 struct rpc_message msg = {
6241 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6242 .rpc_argp = &data->args,
6243 .rpc_resp = &data->res,
6244 .rpc_cred = data->cred,
6245 };
6246 struct rpc_task_setup task_setup_data = {
6247 .task = &data->task,
6248 .rpc_client = NFS_CLIENT(data->args.inode),
6249 .rpc_message = &msg,
6250 .callback_ops = &nfs4_layoutcommit_ops,
6251 .callback_data = data,
6252 .flags = RPC_TASK_ASYNC,
6253 };
6254 struct rpc_task *task;
6255 int status = 0;
6256
6257 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6258 "lbw: %llu inode %lu\n",
6259 data->task.tk_pid, sync,
6260 data->args.lastbytewritten,
6261 data->args.inode->i_ino);
6262
6263 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6264 task = rpc_run_task(&task_setup_data);
6265 if (IS_ERR(task))
6266 return PTR_ERR(task);
6267 if (sync == false)
6268 goto out;
6269 status = nfs4_wait_for_completion_rpc_task(task);
6270 if (status != 0)
6271 goto out;
6272 status = task->tk_status;
6273out:
6274 dprintk("%s: status %d\n", __func__, status);
6275 rpc_put_task(task);
6276 return status;
6277}
6278
6279static int
6280_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6281 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6282{
6283 struct nfs41_secinfo_no_name_args args = {
6284 .style = SECINFO_STYLE_CURRENT_FH,
6285 };
6286 struct nfs4_secinfo_res res = {
6287 .flavors = flavors,
6288 };
6289 struct rpc_message msg = {
6290 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6291 .rpc_argp = &args,
6292 .rpc_resp = &res,
6293 };
6294 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6295}
6296
6297static int
6298nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6299 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6300{
6301 struct nfs4_exception exception = { };
6302 int err;
6303 do {
6304 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6305 switch (err) {
6306 case 0:
6307 case -NFS4ERR_WRONGSEC:
6308 case -NFS4ERR_NOTSUPP:
6309 goto out;
6310 default:
6311 err = nfs4_handle_exception(server, err, &exception);
6312 }
6313 } while (exception.retry);
6314out:
6315 return err;
6316}
6317
6318static int
6319nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6320 struct nfs_fsinfo *info)
6321{
6322 int err;
6323 struct page *page;
6324 rpc_authflavor_t flavor;
6325 struct nfs4_secinfo_flavors *flavors;
6326
6327 page = alloc_page(GFP_KERNEL);
6328 if (!page) {
6329 err = -ENOMEM;
6330 goto out;
6331 }
6332
6333 flavors = page_address(page);
6334 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6335
6336 /*
6337 * Fall back on "guess and check" method if
6338 * the server doesn't support SECINFO_NO_NAME
6339 */
6340 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6341 err = nfs4_find_root_sec(server, fhandle, info);
6342 goto out_freepage;
6343 }
6344 if (err)
6345 goto out_freepage;
6346
6347 flavor = nfs_find_best_sec(flavors);
6348 if (err == 0)
6349 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6350
6351out_freepage:
6352 put_page(page);
6353 if (err == -EACCES)
6354 return -EPERM;
6355out:
6356 return err;
6357}
6358
6359static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6360{
6361 int status;
6362 struct nfs41_test_stateid_args args = {
6363 .stateid = stateid,
6364 };
6365 struct nfs41_test_stateid_res res;
6366 struct rpc_message msg = {
6367 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6368 .rpc_argp = &args,
6369 .rpc_resp = &res,
6370 };
6371
6372 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6373 status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6374
6375 if (status == NFS_OK)
6376 return res.status;
6377 return status;
6378}
6379
6380static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6381{
6382 struct nfs4_exception exception = { };
6383 int err;
6384 do {
6385 err = nfs4_handle_exception(server,
6386 _nfs41_test_stateid(server, stateid),
6387 &exception);
6388 } while (exception.retry);
6389 return err;
6390}
6391
6392static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6393{
6394 struct nfs41_free_stateid_args args = {
6395 .stateid = stateid,
6396 };
6397 struct nfs41_free_stateid_res res;
6398 struct rpc_message msg = {
6399 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6400 .rpc_argp = &args,
6401 .rpc_resp = &res,
6402 };
6403
6404 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6405 return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6406}
6407
6408static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6409{
6410 struct nfs4_exception exception = { };
6411 int err;
6412 do {
6413 err = nfs4_handle_exception(server,
6414 _nfs4_free_stateid(server, stateid),
6415 &exception);
6416 } while (exception.retry);
6417 return err;
6418}
6419
6420static bool nfs41_match_stateid(const nfs4_stateid *s1,
6421 const nfs4_stateid *s2)
6422{
6423 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6424 return false;
6425
6426 if (s1->seqid == s2->seqid)
6427 return true;
6428 if (s1->seqid == 0 || s2->seqid == 0)
6429 return true;
6430
6431 return false;
6432}
6433
6434#endif /* CONFIG_NFS_V4_1 */
6435
6436static bool nfs4_match_stateid(const nfs4_stateid *s1,
6437 const nfs4_stateid *s2)
6438{
6439 return nfs4_stateid_match(s1, s2);
6440}
6441
6442
6443static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6444 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6445 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6446 .recover_open = nfs4_open_reclaim,
6447 .recover_lock = nfs4_lock_reclaim,
6448 .establish_clid = nfs4_init_clientid,
6449 .get_clid_cred = nfs4_get_setclientid_cred,
6450};
6451
6452#if defined(CONFIG_NFS_V4_1)
6453static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6454 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6455 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6456 .recover_open = nfs4_open_reclaim,
6457 .recover_lock = nfs4_lock_reclaim,
6458 .establish_clid = nfs41_init_clientid,
6459 .get_clid_cred = nfs4_get_exchange_id_cred,
6460 .reclaim_complete = nfs41_proc_reclaim_complete,
6461};
6462#endif /* CONFIG_NFS_V4_1 */
6463
6464static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6465 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6466 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6467 .recover_open = nfs4_open_expired,
6468 .recover_lock = nfs4_lock_expired,
6469 .establish_clid = nfs4_init_clientid,
6470 .get_clid_cred = nfs4_get_setclientid_cred,
6471};
6472
6473#if defined(CONFIG_NFS_V4_1)
6474static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6475 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6476 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6477 .recover_open = nfs41_open_expired,
6478 .recover_lock = nfs41_lock_expired,
6479 .establish_clid = nfs41_init_clientid,
6480 .get_clid_cred = nfs4_get_exchange_id_cred,
6481};
6482#endif /* CONFIG_NFS_V4_1 */
6483
6484static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6485 .sched_state_renewal = nfs4_proc_async_renew,
6486 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6487 .renew_lease = nfs4_proc_renew,
6488};
6489
6490#if defined(CONFIG_NFS_V4_1)
6491static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6492 .sched_state_renewal = nfs41_proc_async_sequence,
6493 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6494 .renew_lease = nfs4_proc_sequence,
6495};
6496#endif
6497
6498static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6499 .minor_version = 0,
6500 .call_sync = _nfs4_call_sync,
6501 .match_stateid = nfs4_match_stateid,
6502 .find_root_sec = nfs4_find_root_sec,
6503 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6504 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6505 .state_renewal_ops = &nfs40_state_renewal_ops,
6506};
6507
6508#if defined(CONFIG_NFS_V4_1)
6509static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6510 .minor_version = 1,
6511 .call_sync = _nfs4_call_sync_session,
6512 .match_stateid = nfs41_match_stateid,
6513 .find_root_sec = nfs41_find_root_sec,
6514 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6515 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6516 .state_renewal_ops = &nfs41_state_renewal_ops,
6517};
6518#endif
6519
6520const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6521 [0] = &nfs_v4_0_minor_ops,
6522#if defined(CONFIG_NFS_V4_1)
6523 [1] = &nfs_v4_1_minor_ops,
6524#endif
6525};
6526
6527static const struct inode_operations nfs4_file_inode_operations = {
6528 .permission = nfs_permission,
6529 .getattr = nfs_getattr,
6530 .setattr = nfs_setattr,
6531 .getxattr = generic_getxattr,
6532 .setxattr = generic_setxattr,
6533 .listxattr = generic_listxattr,
6534 .removexattr = generic_removexattr,
6535};
6536
6537const struct nfs_rpc_ops nfs_v4_clientops = {
6538 .version = 4, /* protocol version */
6539 .dentry_ops = &nfs4_dentry_operations,
6540 .dir_inode_ops = &nfs4_dir_inode_operations,
6541 .file_inode_ops = &nfs4_file_inode_operations,
6542 .file_ops = &nfs4_file_operations,
6543 .getroot = nfs4_proc_get_root,
6544 .submount = nfs4_submount,
6545 .getattr = nfs4_proc_getattr,
6546 .setattr = nfs4_proc_setattr,
6547 .lookup = nfs4_proc_lookup,
6548 .access = nfs4_proc_access,
6549 .readlink = nfs4_proc_readlink,
6550 .create = nfs4_proc_create,
6551 .remove = nfs4_proc_remove,
6552 .unlink_setup = nfs4_proc_unlink_setup,
6553 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6554 .unlink_done = nfs4_proc_unlink_done,
6555 .rename = nfs4_proc_rename,
6556 .rename_setup = nfs4_proc_rename_setup,
6557 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6558 .rename_done = nfs4_proc_rename_done,
6559 .link = nfs4_proc_link,
6560 .symlink = nfs4_proc_symlink,
6561 .mkdir = nfs4_proc_mkdir,
6562 .rmdir = nfs4_proc_remove,
6563 .readdir = nfs4_proc_readdir,
6564 .mknod = nfs4_proc_mknod,
6565 .statfs = nfs4_proc_statfs,
6566 .fsinfo = nfs4_proc_fsinfo,
6567 .pathconf = nfs4_proc_pathconf,
6568 .set_capabilities = nfs4_server_capabilities,
6569 .decode_dirent = nfs4_decode_dirent,
6570 .read_setup = nfs4_proc_read_setup,
6571 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6572 .read_done = nfs4_read_done,
6573 .write_setup = nfs4_proc_write_setup,
6574 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6575 .write_done = nfs4_write_done,
6576 .commit_setup = nfs4_proc_commit_setup,
6577 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6578 .commit_done = nfs4_commit_done,
6579 .lock = nfs4_proc_lock,
6580 .clear_acl_cache = nfs4_zap_acl_attr,
6581 .close_context = nfs4_close_context,
6582 .open_context = nfs4_atomic_open,
6583 .init_client = nfs4_init_client,
6584};
6585
6586static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6587 .prefix = XATTR_NAME_NFSV4_ACL,
6588 .list = nfs4_xattr_list_nfs4_acl,
6589 .get = nfs4_xattr_get_nfs4_acl,
6590 .set = nfs4_xattr_set_nfs4_acl,
6591};
6592
6593const struct xattr_handler *nfs4_xattr_handlers[] = {
6594 &nfs4_xattr_nfs4_acl_handler,
6595 NULL
6596};
6597
6598module_param(max_session_slots, ushort, 0644);
6599MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6600 "requests the client will negotiate");
6601
6602/*
6603 * Local variables:
6604 * c-basic-offset: 8
6605 * End:
6606 */
Linux 6.x block layer and io_uring tree(s)