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vfs: move dentry name length comparison from dentry_cmp() into callers
[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
68#define NFSDBG_FACILITY NFSDBG_PROC
69
70#define NFS4_POLL_RETRY_MIN (HZ/10)
71#define NFS4_POLL_RETRY_MAX (15*HZ)
72
73#define NFS4_MAX_LOOP_ON_RECOVER (10)
74
75static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
76
77struct nfs4_opendata;
78static int _nfs4_proc_open(struct nfs4_opendata *data);
79static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
80static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
81static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
82static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
83static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
84static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
85 struct nfs_fattr *fattr, struct iattr *sattr,
86 struct nfs4_state *state);
87#ifdef CONFIG_NFS_V4_1
88static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
89static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
90#endif
91/* Prevent leaks of NFSv4 errors into userland */
92static int nfs4_map_errors(int err)
93{
94 if (err >= -1000)
95 return err;
96 switch (err) {
97 case -NFS4ERR_RESOURCE:
98 return -EREMOTEIO;
99 case -NFS4ERR_WRONGSEC:
100 return -EPERM;
101 case -NFS4ERR_BADOWNER:
102 case -NFS4ERR_BADNAME:
103 return -EINVAL;
104 default:
105 dprintk("%s could not handle NFSv4 error %d\n",
106 __func__, -err);
107 break;
108 }
109 return -EIO;
110}
111
112/*
113 * This is our standard bitmap for GETATTR requests.
114 */
115const u32 nfs4_fattr_bitmap[2] = {
116 FATTR4_WORD0_TYPE
117 | FATTR4_WORD0_CHANGE
118 | FATTR4_WORD0_SIZE
119 | FATTR4_WORD0_FSID
120 | FATTR4_WORD0_FILEID,
121 FATTR4_WORD1_MODE
122 | FATTR4_WORD1_NUMLINKS
123 | FATTR4_WORD1_OWNER
124 | FATTR4_WORD1_OWNER_GROUP
125 | FATTR4_WORD1_RAWDEV
126 | FATTR4_WORD1_SPACE_USED
127 | FATTR4_WORD1_TIME_ACCESS
128 | FATTR4_WORD1_TIME_METADATA
129 | FATTR4_WORD1_TIME_MODIFY
130};
131
132const u32 nfs4_statfs_bitmap[2] = {
133 FATTR4_WORD0_FILES_AVAIL
134 | FATTR4_WORD0_FILES_FREE
135 | FATTR4_WORD0_FILES_TOTAL,
136 FATTR4_WORD1_SPACE_AVAIL
137 | FATTR4_WORD1_SPACE_FREE
138 | FATTR4_WORD1_SPACE_TOTAL
139};
140
141const u32 nfs4_pathconf_bitmap[2] = {
142 FATTR4_WORD0_MAXLINK
143 | FATTR4_WORD0_MAXNAME,
144 0
145};
146
147const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
148 | FATTR4_WORD0_MAXREAD
149 | FATTR4_WORD0_MAXWRITE
150 | FATTR4_WORD0_LEASE_TIME,
151 FATTR4_WORD1_TIME_DELTA
152 | FATTR4_WORD1_FS_LAYOUT_TYPES,
153 FATTR4_WORD2_LAYOUT_BLKSIZE
154};
155
156const u32 nfs4_fs_locations_bitmap[2] = {
157 FATTR4_WORD0_TYPE
158 | FATTR4_WORD0_CHANGE
159 | FATTR4_WORD0_SIZE
160 | FATTR4_WORD0_FSID
161 | FATTR4_WORD0_FILEID
162 | FATTR4_WORD0_FS_LOCATIONS,
163 FATTR4_WORD1_MODE
164 | FATTR4_WORD1_NUMLINKS
165 | FATTR4_WORD1_OWNER
166 | FATTR4_WORD1_OWNER_GROUP
167 | FATTR4_WORD1_RAWDEV
168 | FATTR4_WORD1_SPACE_USED
169 | FATTR4_WORD1_TIME_ACCESS
170 | FATTR4_WORD1_TIME_METADATA
171 | FATTR4_WORD1_TIME_MODIFY
172 | FATTR4_WORD1_MOUNTED_ON_FILEID
173};
174
175static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
176 struct nfs4_readdir_arg *readdir)
177{
178 __be32 *start, *p;
179
180 BUG_ON(readdir->count < 80);
181 if (cookie > 2) {
182 readdir->cookie = cookie;
183 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
184 return;
185 }
186
187 readdir->cookie = 0;
188 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
189 if (cookie == 2)
190 return;
191
192 /*
193 * NFSv4 servers do not return entries for '.' and '..'
194 * Therefore, we fake these entries here. We let '.'
195 * have cookie 0 and '..' have cookie 1. Note that
196 * when talking to the server, we always send cookie 0
197 * instead of 1 or 2.
198 */
199 start = p = kmap_atomic(*readdir->pages);
200
201 if (cookie == 0) {
202 *p++ = xdr_one; /* next */
203 *p++ = xdr_zero; /* cookie, first word */
204 *p++ = xdr_one; /* cookie, second word */
205 *p++ = xdr_one; /* entry len */
206 memcpy(p, ".\0\0\0", 4); /* entry */
207 p++;
208 *p++ = xdr_one; /* bitmap length */
209 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
210 *p++ = htonl(8); /* attribute buffer length */
211 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
212 }
213
214 *p++ = xdr_one; /* next */
215 *p++ = xdr_zero; /* cookie, first word */
216 *p++ = xdr_two; /* cookie, second word */
217 *p++ = xdr_two; /* entry len */
218 memcpy(p, "..\0\0", 4); /* entry */
219 p++;
220 *p++ = xdr_one; /* bitmap length */
221 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
222 *p++ = htonl(8); /* attribute buffer length */
223 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
224
225 readdir->pgbase = (char *)p - (char *)start;
226 readdir->count -= readdir->pgbase;
227 kunmap_atomic(start);
228}
229
230static int nfs4_wait_clnt_recover(struct nfs_client *clp)
231{
232 int res;
233
234 might_sleep();
235
236 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
237 nfs_wait_bit_killable, TASK_KILLABLE);
238 return res;
239}
240
241static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
242{
243 int res = 0;
244
245 might_sleep();
246
247 if (*timeout <= 0)
248 *timeout = NFS4_POLL_RETRY_MIN;
249 if (*timeout > NFS4_POLL_RETRY_MAX)
250 *timeout = NFS4_POLL_RETRY_MAX;
251 freezable_schedule_timeout_killable(*timeout);
252 if (fatal_signal_pending(current))
253 res = -ERESTARTSYS;
254 *timeout <<= 1;
255 return res;
256}
257
258/* This is the error handling routine for processes that are allowed
259 * to sleep.
260 */
261static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
262{
263 struct nfs_client *clp = server->nfs_client;
264 struct nfs4_state *state = exception->state;
265 struct inode *inode = exception->inode;
266 int ret = errorcode;
267
268 exception->retry = 0;
269 switch(errorcode) {
270 case 0:
271 return 0;
272 case -NFS4ERR_OPENMODE:
273 if (inode && nfs_have_delegation(inode, FMODE_READ)) {
274 nfs_inode_return_delegation(inode);
275 exception->retry = 1;
276 return 0;
277 }
278 if (state == NULL)
279 break;
280 nfs4_schedule_stateid_recovery(server, state);
281 goto wait_on_recovery;
282 case -NFS4ERR_DELEG_REVOKED:
283 case -NFS4ERR_ADMIN_REVOKED:
284 case -NFS4ERR_BAD_STATEID:
285 if (state == NULL)
286 break;
287 nfs_remove_bad_delegation(state->inode);
288 nfs4_schedule_stateid_recovery(server, state);
289 goto wait_on_recovery;
290 case -NFS4ERR_EXPIRED:
291 if (state != NULL)
292 nfs4_schedule_stateid_recovery(server, state);
293 case -NFS4ERR_STALE_STATEID:
294 case -NFS4ERR_STALE_CLIENTID:
295 nfs4_schedule_lease_recovery(clp);
296 goto wait_on_recovery;
297#if defined(CONFIG_NFS_V4_1)
298 case -NFS4ERR_BADSESSION:
299 case -NFS4ERR_BADSLOT:
300 case -NFS4ERR_BAD_HIGH_SLOT:
301 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
302 case -NFS4ERR_DEADSESSION:
303 case -NFS4ERR_SEQ_FALSE_RETRY:
304 case -NFS4ERR_SEQ_MISORDERED:
305 dprintk("%s ERROR: %d Reset session\n", __func__,
306 errorcode);
307 nfs4_schedule_session_recovery(clp->cl_session);
308 exception->retry = 1;
309 break;
310#endif /* defined(CONFIG_NFS_V4_1) */
311 case -NFS4ERR_FILE_OPEN:
312 if (exception->timeout > HZ) {
313 /* We have retried a decent amount, time to
314 * fail
315 */
316 ret = -EBUSY;
317 break;
318 }
319 case -NFS4ERR_GRACE:
320 case -NFS4ERR_DELAY:
321 case -EKEYEXPIRED:
322 ret = nfs4_delay(server->client, &exception->timeout);
323 if (ret != 0)
324 break;
325 case -NFS4ERR_RETRY_UNCACHED_REP:
326 case -NFS4ERR_OLD_STATEID:
327 exception->retry = 1;
328 break;
329 case -NFS4ERR_BADOWNER:
330 /* The following works around a Linux server bug! */
331 case -NFS4ERR_BADNAME:
332 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
333 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
334 exception->retry = 1;
335 printk(KERN_WARNING "NFS: v4 server %s "
336 "does not accept raw "
337 "uid/gids. "
338 "Reenabling the idmapper.\n",
339 server->nfs_client->cl_hostname);
340 }
341 }
342 /* We failed to handle the error */
343 return nfs4_map_errors(ret);
344wait_on_recovery:
345 ret = nfs4_wait_clnt_recover(clp);
346 if (ret == 0)
347 exception->retry = 1;
348 return ret;
349}
350
351
352static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
353{
354 spin_lock(&clp->cl_lock);
355 if (time_before(clp->cl_last_renewal,timestamp))
356 clp->cl_last_renewal = timestamp;
357 spin_unlock(&clp->cl_lock);
358}
359
360static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
361{
362 do_renew_lease(server->nfs_client, timestamp);
363}
364
365#if defined(CONFIG_NFS_V4_1)
366
367/*
368 * nfs4_free_slot - free a slot and efficiently update slot table.
369 *
370 * freeing a slot is trivially done by clearing its respective bit
371 * in the bitmap.
372 * If the freed slotid equals highest_used_slotid we want to update it
373 * so that the server would be able to size down the slot table if needed,
374 * otherwise we know that the highest_used_slotid is still in use.
375 * When updating highest_used_slotid there may be "holes" in the bitmap
376 * so we need to scan down from highest_used_slotid to 0 looking for the now
377 * highest slotid in use.
378 * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
379 *
380 * Must be called while holding tbl->slot_tbl_lock
381 */
382static void
383nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
384{
385 BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
386 /* clear used bit in bitmap */
387 __clear_bit(slotid, tbl->used_slots);
388
389 /* update highest_used_slotid when it is freed */
390 if (slotid == tbl->highest_used_slotid) {
391 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
392 if (slotid < tbl->max_slots)
393 tbl->highest_used_slotid = slotid;
394 else
395 tbl->highest_used_slotid = NFS4_NO_SLOT;
396 }
397 dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
398 slotid, tbl->highest_used_slotid);
399}
400
401bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
402{
403 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
404 return true;
405}
406
407/*
408 * Signal state manager thread if session fore channel is drained
409 */
410static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
411{
412 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
413 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
414 nfs4_set_task_privileged, NULL);
415 return;
416 }
417
418 if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
419 return;
420
421 dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
422 complete(&ses->fc_slot_table.complete);
423}
424
425/*
426 * Signal state manager thread if session back channel is drained
427 */
428void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
429{
430 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
431 ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
432 return;
433 dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
434 complete(&ses->bc_slot_table.complete);
435}
436
437static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
438{
439 struct nfs4_slot_table *tbl;
440
441 tbl = &res->sr_session->fc_slot_table;
442 if (!res->sr_slot) {
443 /* just wake up the next guy waiting since
444 * we may have not consumed a slot after all */
445 dprintk("%s: No slot\n", __func__);
446 return;
447 }
448
449 spin_lock(&tbl->slot_tbl_lock);
450 nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
451 nfs4_check_drain_fc_complete(res->sr_session);
452 spin_unlock(&tbl->slot_tbl_lock);
453 res->sr_slot = NULL;
454}
455
456static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
457{
458 unsigned long timestamp;
459 struct nfs_client *clp;
460
461 /*
462 * sr_status remains 1 if an RPC level error occurred. The server
463 * may or may not have processed the sequence operation..
464 * Proceed as if the server received and processed the sequence
465 * operation.
466 */
467 if (res->sr_status == 1)
468 res->sr_status = NFS_OK;
469
470 /* don't increment the sequence number if the task wasn't sent */
471 if (!RPC_WAS_SENT(task))
472 goto out;
473
474 /* Check the SEQUENCE operation status */
475 switch (res->sr_status) {
476 case 0:
477 /* Update the slot's sequence and clientid lease timer */
478 ++res->sr_slot->seq_nr;
479 timestamp = res->sr_renewal_time;
480 clp = res->sr_session->clp;
481 do_renew_lease(clp, timestamp);
482 /* Check sequence flags */
483 if (res->sr_status_flags != 0)
484 nfs4_schedule_lease_recovery(clp);
485 break;
486 case -NFS4ERR_DELAY:
487 /* The server detected a resend of the RPC call and
488 * returned NFS4ERR_DELAY as per Section 2.10.6.2
489 * of RFC5661.
490 */
491 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
492 __func__,
493 res->sr_slot - res->sr_session->fc_slot_table.slots,
494 res->sr_slot->seq_nr);
495 goto out_retry;
496 default:
497 /* Just update the slot sequence no. */
498 ++res->sr_slot->seq_nr;
499 }
500out:
501 /* The session may be reset by one of the error handlers. */
502 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
503 nfs41_sequence_free_slot(res);
504 return 1;
505out_retry:
506 if (!rpc_restart_call(task))
507 goto out;
508 rpc_delay(task, NFS4_POLL_RETRY_MAX);
509 return 0;
510}
511
512static int nfs4_sequence_done(struct rpc_task *task,
513 struct nfs4_sequence_res *res)
514{
515 if (res->sr_session == NULL)
516 return 1;
517 return nfs41_sequence_done(task, res);
518}
519
520/*
521 * nfs4_find_slot - efficiently look for a free slot
522 *
523 * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
524 * If found, we mark the slot as used, update the highest_used_slotid,
525 * and respectively set up the sequence operation args.
526 * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
527 *
528 * Note: must be called with under the slot_tbl_lock.
529 */
530static u32
531nfs4_find_slot(struct nfs4_slot_table *tbl)
532{
533 u32 slotid;
534 u32 ret_id = NFS4_NO_SLOT;
535
536 dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
537 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
538 tbl->max_slots);
539 slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
540 if (slotid >= tbl->max_slots)
541 goto out;
542 __set_bit(slotid, tbl->used_slots);
543 if (slotid > tbl->highest_used_slotid ||
544 tbl->highest_used_slotid == NFS4_NO_SLOT)
545 tbl->highest_used_slotid = slotid;
546 ret_id = slotid;
547out:
548 dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
549 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
550 return ret_id;
551}
552
553static void nfs41_init_sequence(struct nfs4_sequence_args *args,
554 struct nfs4_sequence_res *res, int cache_reply)
555{
556 args->sa_session = NULL;
557 args->sa_cache_this = 0;
558 if (cache_reply)
559 args->sa_cache_this = 1;
560 res->sr_session = NULL;
561 res->sr_slot = NULL;
562}
563
564int nfs41_setup_sequence(struct nfs4_session *session,
565 struct nfs4_sequence_args *args,
566 struct nfs4_sequence_res *res,
567 struct rpc_task *task)
568{
569 struct nfs4_slot *slot;
570 struct nfs4_slot_table *tbl;
571 u32 slotid;
572
573 dprintk("--> %s\n", __func__);
574 /* slot already allocated? */
575 if (res->sr_slot != NULL)
576 return 0;
577
578 tbl = &session->fc_slot_table;
579
580 spin_lock(&tbl->slot_tbl_lock);
581 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
582 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
583 /* The state manager will wait until the slot table is empty */
584 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
585 spin_unlock(&tbl->slot_tbl_lock);
586 dprintk("%s session is draining\n", __func__);
587 return -EAGAIN;
588 }
589
590 if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
591 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
592 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
593 spin_unlock(&tbl->slot_tbl_lock);
594 dprintk("%s enforce FIFO order\n", __func__);
595 return -EAGAIN;
596 }
597
598 slotid = nfs4_find_slot(tbl);
599 if (slotid == NFS4_NO_SLOT) {
600 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
601 spin_unlock(&tbl->slot_tbl_lock);
602 dprintk("<-- %s: no free slots\n", __func__);
603 return -EAGAIN;
604 }
605 spin_unlock(&tbl->slot_tbl_lock);
606
607 rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
608 slot = tbl->slots + slotid;
609 args->sa_session = session;
610 args->sa_slotid = slotid;
611
612 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
613
614 res->sr_session = session;
615 res->sr_slot = slot;
616 res->sr_renewal_time = jiffies;
617 res->sr_status_flags = 0;
618 /*
619 * sr_status is only set in decode_sequence, and so will remain
620 * set to 1 if an rpc level failure occurs.
621 */
622 res->sr_status = 1;
623 return 0;
624}
625EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
626
627int nfs4_setup_sequence(const struct nfs_server *server,
628 struct nfs4_sequence_args *args,
629 struct nfs4_sequence_res *res,
630 struct rpc_task *task)
631{
632 struct nfs4_session *session = nfs4_get_session(server);
633 int ret = 0;
634
635 if (session == NULL)
636 goto out;
637
638 dprintk("--> %s clp %p session %p sr_slot %td\n",
639 __func__, session->clp, session, res->sr_slot ?
640 res->sr_slot - session->fc_slot_table.slots : -1);
641
642 ret = nfs41_setup_sequence(session, args, res, task);
643out:
644 dprintk("<-- %s status=%d\n", __func__, ret);
645 return ret;
646}
647
648struct nfs41_call_sync_data {
649 const struct nfs_server *seq_server;
650 struct nfs4_sequence_args *seq_args;
651 struct nfs4_sequence_res *seq_res;
652};
653
654static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
655{
656 struct nfs41_call_sync_data *data = calldata;
657
658 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
659
660 if (nfs4_setup_sequence(data->seq_server, data->seq_args,
661 data->seq_res, task))
662 return;
663 rpc_call_start(task);
664}
665
666static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
667{
668 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
669 nfs41_call_sync_prepare(task, calldata);
670}
671
672static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
673{
674 struct nfs41_call_sync_data *data = calldata;
675
676 nfs41_sequence_done(task, data->seq_res);
677}
678
679static const struct rpc_call_ops nfs41_call_sync_ops = {
680 .rpc_call_prepare = nfs41_call_sync_prepare,
681 .rpc_call_done = nfs41_call_sync_done,
682};
683
684static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
685 .rpc_call_prepare = nfs41_call_priv_sync_prepare,
686 .rpc_call_done = nfs41_call_sync_done,
687};
688
689static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
690 struct nfs_server *server,
691 struct rpc_message *msg,
692 struct nfs4_sequence_args *args,
693 struct nfs4_sequence_res *res,
694 int privileged)
695{
696 int ret;
697 struct rpc_task *task;
698 struct nfs41_call_sync_data data = {
699 .seq_server = server,
700 .seq_args = args,
701 .seq_res = res,
702 };
703 struct rpc_task_setup task_setup = {
704 .rpc_client = clnt,
705 .rpc_message = msg,
706 .callback_ops = &nfs41_call_sync_ops,
707 .callback_data = &data
708 };
709
710 if (privileged)
711 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
712 task = rpc_run_task(&task_setup);
713 if (IS_ERR(task))
714 ret = PTR_ERR(task);
715 else {
716 ret = task->tk_status;
717 rpc_put_task(task);
718 }
719 return ret;
720}
721
722int _nfs4_call_sync_session(struct rpc_clnt *clnt,
723 struct nfs_server *server,
724 struct rpc_message *msg,
725 struct nfs4_sequence_args *args,
726 struct nfs4_sequence_res *res,
727 int cache_reply)
728{
729 nfs41_init_sequence(args, res, cache_reply);
730 return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
731}
732
733#else
734static inline
735void nfs41_init_sequence(struct nfs4_sequence_args *args,
736 struct nfs4_sequence_res *res, int cache_reply)
737{
738}
739
740static int nfs4_sequence_done(struct rpc_task *task,
741 struct nfs4_sequence_res *res)
742{
743 return 1;
744}
745#endif /* CONFIG_NFS_V4_1 */
746
747int _nfs4_call_sync(struct rpc_clnt *clnt,
748 struct nfs_server *server,
749 struct rpc_message *msg,
750 struct nfs4_sequence_args *args,
751 struct nfs4_sequence_res *res,
752 int cache_reply)
753{
754 nfs41_init_sequence(args, res, cache_reply);
755 return rpc_call_sync(clnt, msg, 0);
756}
757
758static inline
759int nfs4_call_sync(struct rpc_clnt *clnt,
760 struct nfs_server *server,
761 struct rpc_message *msg,
762 struct nfs4_sequence_args *args,
763 struct nfs4_sequence_res *res,
764 int cache_reply)
765{
766 return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
767 args, res, cache_reply);
768}
769
770static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
771{
772 struct nfs_inode *nfsi = NFS_I(dir);
773
774 spin_lock(&dir->i_lock);
775 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
776 if (!cinfo->atomic || cinfo->before != dir->i_version)
777 nfs_force_lookup_revalidate(dir);
778 dir->i_version = cinfo->after;
779 spin_unlock(&dir->i_lock);
780}
781
782struct nfs4_opendata {
783 struct kref kref;
784 struct nfs_openargs o_arg;
785 struct nfs_openres o_res;
786 struct nfs_open_confirmargs c_arg;
787 struct nfs_open_confirmres c_res;
788 struct nfs4_string owner_name;
789 struct nfs4_string group_name;
790 struct nfs_fattr f_attr;
791 struct nfs_fattr dir_attr;
792 struct dentry *dir;
793 struct dentry *dentry;
794 struct nfs4_state_owner *owner;
795 struct nfs4_state *state;
796 struct iattr attrs;
797 unsigned long timestamp;
798 unsigned int rpc_done : 1;
799 int rpc_status;
800 int cancelled;
801};
802
803
804static void nfs4_init_opendata_res(struct nfs4_opendata *p)
805{
806 p->o_res.f_attr = &p->f_attr;
807 p->o_res.dir_attr = &p->dir_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(&p->dir_attr);
813 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
814}
815
816static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
817 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
818 const struct iattr *attrs,
819 gfp_t gfp_mask)
820{
821 struct dentry *parent = dget_parent(dentry);
822 struct inode *dir = parent->d_inode;
823 struct nfs_server *server = NFS_SERVER(dir);
824 struct nfs4_opendata *p;
825
826 p = kzalloc(sizeof(*p), gfp_mask);
827 if (p == NULL)
828 goto err;
829 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
830 if (p->o_arg.seqid == NULL)
831 goto err_free;
832 nfs_sb_active(dentry->d_sb);
833 p->dentry = dget(dentry);
834 p->dir = parent;
835 p->owner = sp;
836 atomic_inc(&sp->so_count);
837 p->o_arg.fh = NFS_FH(dir);
838 p->o_arg.open_flags = flags;
839 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
840 p->o_arg.clientid = server->nfs_client->cl_clientid;
841 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
842 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
843 p->o_arg.name = &dentry->d_name;
844 p->o_arg.server = server;
845 p->o_arg.bitmask = server->attr_bitmask;
846 p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
847 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
848 if (attrs != NULL && attrs->ia_valid != 0) {
849 __be32 verf[2];
850
851 p->o_arg.u.attrs = &p->attrs;
852 memcpy(&p->attrs, attrs, sizeof(p->attrs));
853
854 verf[0] = jiffies;
855 verf[1] = current->pid;
856 memcpy(p->o_arg.u.verifier.data, verf,
857 sizeof(p->o_arg.u.verifier.data));
858 }
859 p->c_arg.fh = &p->o_res.fh;
860 p->c_arg.stateid = &p->o_res.stateid;
861 p->c_arg.seqid = p->o_arg.seqid;
862 nfs4_init_opendata_res(p);
863 kref_init(&p->kref);
864 return p;
865err_free:
866 kfree(p);
867err:
868 dput(parent);
869 return NULL;
870}
871
872static void nfs4_opendata_free(struct kref *kref)
873{
874 struct nfs4_opendata *p = container_of(kref,
875 struct nfs4_opendata, kref);
876 struct super_block *sb = p->dentry->d_sb;
877
878 nfs_free_seqid(p->o_arg.seqid);
879 if (p->state != NULL)
880 nfs4_put_open_state(p->state);
881 nfs4_put_state_owner(p->owner);
882 dput(p->dir);
883 dput(p->dentry);
884 nfs_sb_deactive(sb);
885 nfs_fattr_free_names(&p->f_attr);
886 kfree(p);
887}
888
889static void nfs4_opendata_put(struct nfs4_opendata *p)
890{
891 if (p != NULL)
892 kref_put(&p->kref, nfs4_opendata_free);
893}
894
895static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
896{
897 int ret;
898
899 ret = rpc_wait_for_completion_task(task);
900 return ret;
901}
902
903static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
904{
905 int ret = 0;
906
907 if (open_mode & (O_EXCL|O_TRUNC))
908 goto out;
909 switch (mode & (FMODE_READ|FMODE_WRITE)) {
910 case FMODE_READ:
911 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
912 && state->n_rdonly != 0;
913 break;
914 case FMODE_WRITE:
915 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
916 && state->n_wronly != 0;
917 break;
918 case FMODE_READ|FMODE_WRITE:
919 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
920 && state->n_rdwr != 0;
921 }
922out:
923 return ret;
924}
925
926static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
927{
928 if (delegation == NULL)
929 return 0;
930 if ((delegation->type & fmode) != fmode)
931 return 0;
932 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
933 return 0;
934 nfs_mark_delegation_referenced(delegation);
935 return 1;
936}
937
938static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
939{
940 switch (fmode) {
941 case FMODE_WRITE:
942 state->n_wronly++;
943 break;
944 case FMODE_READ:
945 state->n_rdonly++;
946 break;
947 case FMODE_READ|FMODE_WRITE:
948 state->n_rdwr++;
949 }
950 nfs4_state_set_mode_locked(state, state->state | fmode);
951}
952
953static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
954{
955 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
956 nfs4_stateid_copy(&state->stateid, stateid);
957 nfs4_stateid_copy(&state->open_stateid, stateid);
958 switch (fmode) {
959 case FMODE_READ:
960 set_bit(NFS_O_RDONLY_STATE, &state->flags);
961 break;
962 case FMODE_WRITE:
963 set_bit(NFS_O_WRONLY_STATE, &state->flags);
964 break;
965 case FMODE_READ|FMODE_WRITE:
966 set_bit(NFS_O_RDWR_STATE, &state->flags);
967 }
968}
969
970static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
971{
972 write_seqlock(&state->seqlock);
973 nfs_set_open_stateid_locked(state, stateid, fmode);
974 write_sequnlock(&state->seqlock);
975}
976
977static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
978{
979 /*
980 * Protect the call to nfs4_state_set_mode_locked and
981 * serialise the stateid update
982 */
983 write_seqlock(&state->seqlock);
984 if (deleg_stateid != NULL) {
985 nfs4_stateid_copy(&state->stateid, deleg_stateid);
986 set_bit(NFS_DELEGATED_STATE, &state->flags);
987 }
988 if (open_stateid != NULL)
989 nfs_set_open_stateid_locked(state, open_stateid, fmode);
990 write_sequnlock(&state->seqlock);
991 spin_lock(&state->owner->so_lock);
992 update_open_stateflags(state, fmode);
993 spin_unlock(&state->owner->so_lock);
994}
995
996static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
997{
998 struct nfs_inode *nfsi = NFS_I(state->inode);
999 struct nfs_delegation *deleg_cur;
1000 int ret = 0;
1001
1002 fmode &= (FMODE_READ|FMODE_WRITE);
1003
1004 rcu_read_lock();
1005 deleg_cur = rcu_dereference(nfsi->delegation);
1006 if (deleg_cur == NULL)
1007 goto no_delegation;
1008
1009 spin_lock(&deleg_cur->lock);
1010 if (nfsi->delegation != deleg_cur ||
1011 (deleg_cur->type & fmode) != fmode)
1012 goto no_delegation_unlock;
1013
1014 if (delegation == NULL)
1015 delegation = &deleg_cur->stateid;
1016 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1017 goto no_delegation_unlock;
1018
1019 nfs_mark_delegation_referenced(deleg_cur);
1020 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1021 ret = 1;
1022no_delegation_unlock:
1023 spin_unlock(&deleg_cur->lock);
1024no_delegation:
1025 rcu_read_unlock();
1026
1027 if (!ret && open_stateid != NULL) {
1028 __update_open_stateid(state, open_stateid, NULL, fmode);
1029 ret = 1;
1030 }
1031
1032 return ret;
1033}
1034
1035
1036static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1037{
1038 struct nfs_delegation *delegation;
1039
1040 rcu_read_lock();
1041 delegation = rcu_dereference(NFS_I(inode)->delegation);
1042 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1043 rcu_read_unlock();
1044 return;
1045 }
1046 rcu_read_unlock();
1047 nfs_inode_return_delegation(inode);
1048}
1049
1050static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1051{
1052 struct nfs4_state *state = opendata->state;
1053 struct nfs_inode *nfsi = NFS_I(state->inode);
1054 struct nfs_delegation *delegation;
1055 int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1056 fmode_t fmode = opendata->o_arg.fmode;
1057 nfs4_stateid stateid;
1058 int ret = -EAGAIN;
1059
1060 for (;;) {
1061 if (can_open_cached(state, fmode, open_mode)) {
1062 spin_lock(&state->owner->so_lock);
1063 if (can_open_cached(state, fmode, open_mode)) {
1064 update_open_stateflags(state, fmode);
1065 spin_unlock(&state->owner->so_lock);
1066 goto out_return_state;
1067 }
1068 spin_unlock(&state->owner->so_lock);
1069 }
1070 rcu_read_lock();
1071 delegation = rcu_dereference(nfsi->delegation);
1072 if (!can_open_delegated(delegation, fmode)) {
1073 rcu_read_unlock();
1074 break;
1075 }
1076 /* Save the delegation */
1077 nfs4_stateid_copy(&stateid, &delegation->stateid);
1078 rcu_read_unlock();
1079 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1080 if (ret != 0)
1081 goto out;
1082 ret = -EAGAIN;
1083
1084 /* Try to update the stateid using the delegation */
1085 if (update_open_stateid(state, NULL, &stateid, fmode))
1086 goto out_return_state;
1087 }
1088out:
1089 return ERR_PTR(ret);
1090out_return_state:
1091 atomic_inc(&state->count);
1092 return state;
1093}
1094
1095static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1096{
1097 struct inode *inode;
1098 struct nfs4_state *state = NULL;
1099 struct nfs_delegation *delegation;
1100 int ret;
1101
1102 if (!data->rpc_done) {
1103 state = nfs4_try_open_cached(data);
1104 goto out;
1105 }
1106
1107 ret = -EAGAIN;
1108 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1109 goto err;
1110 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1111 ret = PTR_ERR(inode);
1112 if (IS_ERR(inode))
1113 goto err;
1114 ret = -ENOMEM;
1115 state = nfs4_get_open_state(inode, data->owner);
1116 if (state == NULL)
1117 goto err_put_inode;
1118 if (data->o_res.delegation_type != 0) {
1119 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1120 int delegation_flags = 0;
1121
1122 rcu_read_lock();
1123 delegation = rcu_dereference(NFS_I(inode)->delegation);
1124 if (delegation)
1125 delegation_flags = delegation->flags;
1126 rcu_read_unlock();
1127 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1128 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1129 "returning a delegation for "
1130 "OPEN(CLAIM_DELEGATE_CUR)\n",
1131 clp->cl_hostname);
1132 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1133 nfs_inode_set_delegation(state->inode,
1134 data->owner->so_cred,
1135 &data->o_res);
1136 else
1137 nfs_inode_reclaim_delegation(state->inode,
1138 data->owner->so_cred,
1139 &data->o_res);
1140 }
1141
1142 update_open_stateid(state, &data->o_res.stateid, NULL,
1143 data->o_arg.fmode);
1144 iput(inode);
1145out:
1146 return state;
1147err_put_inode:
1148 iput(inode);
1149err:
1150 return ERR_PTR(ret);
1151}
1152
1153static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1154{
1155 struct nfs_inode *nfsi = NFS_I(state->inode);
1156 struct nfs_open_context *ctx;
1157
1158 spin_lock(&state->inode->i_lock);
1159 list_for_each_entry(ctx, &nfsi->open_files, list) {
1160 if (ctx->state != state)
1161 continue;
1162 get_nfs_open_context(ctx);
1163 spin_unlock(&state->inode->i_lock);
1164 return ctx;
1165 }
1166 spin_unlock(&state->inode->i_lock);
1167 return ERR_PTR(-ENOENT);
1168}
1169
1170static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1171{
1172 struct nfs4_opendata *opendata;
1173
1174 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1175 if (opendata == NULL)
1176 return ERR_PTR(-ENOMEM);
1177 opendata->state = state;
1178 atomic_inc(&state->count);
1179 return opendata;
1180}
1181
1182static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1183{
1184 struct nfs4_state *newstate;
1185 int ret;
1186
1187 opendata->o_arg.open_flags = 0;
1188 opendata->o_arg.fmode = fmode;
1189 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1190 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1191 nfs4_init_opendata_res(opendata);
1192 ret = _nfs4_recover_proc_open(opendata);
1193 if (ret != 0)
1194 return ret;
1195 newstate = nfs4_opendata_to_nfs4_state(opendata);
1196 if (IS_ERR(newstate))
1197 return PTR_ERR(newstate);
1198 nfs4_close_state(newstate, fmode);
1199 *res = newstate;
1200 return 0;
1201}
1202
1203static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1204{
1205 struct nfs4_state *newstate;
1206 int ret;
1207
1208 /* memory barrier prior to reading state->n_* */
1209 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1210 smp_rmb();
1211 if (state->n_rdwr != 0) {
1212 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1213 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1214 if (ret != 0)
1215 return ret;
1216 if (newstate != state)
1217 return -ESTALE;
1218 }
1219 if (state->n_wronly != 0) {
1220 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1221 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1222 if (ret != 0)
1223 return ret;
1224 if (newstate != state)
1225 return -ESTALE;
1226 }
1227 if (state->n_rdonly != 0) {
1228 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1229 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1230 if (ret != 0)
1231 return ret;
1232 if (newstate != state)
1233 return -ESTALE;
1234 }
1235 /*
1236 * We may have performed cached opens for all three recoveries.
1237 * Check if we need to update the current stateid.
1238 */
1239 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1240 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1241 write_seqlock(&state->seqlock);
1242 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1243 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1244 write_sequnlock(&state->seqlock);
1245 }
1246 return 0;
1247}
1248
1249/*
1250 * OPEN_RECLAIM:
1251 * reclaim state on the server after a reboot.
1252 */
1253static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1254{
1255 struct nfs_delegation *delegation;
1256 struct nfs4_opendata *opendata;
1257 fmode_t delegation_type = 0;
1258 int status;
1259
1260 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1261 if (IS_ERR(opendata))
1262 return PTR_ERR(opendata);
1263 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1264 opendata->o_arg.fh = NFS_FH(state->inode);
1265 rcu_read_lock();
1266 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1267 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1268 delegation_type = delegation->type;
1269 rcu_read_unlock();
1270 opendata->o_arg.u.delegation_type = delegation_type;
1271 status = nfs4_open_recover(opendata, state);
1272 nfs4_opendata_put(opendata);
1273 return status;
1274}
1275
1276static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1277{
1278 struct nfs_server *server = NFS_SERVER(state->inode);
1279 struct nfs4_exception exception = { };
1280 int err;
1281 do {
1282 err = _nfs4_do_open_reclaim(ctx, state);
1283 if (err != -NFS4ERR_DELAY)
1284 break;
1285 nfs4_handle_exception(server, err, &exception);
1286 } while (exception.retry);
1287 return err;
1288}
1289
1290static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1291{
1292 struct nfs_open_context *ctx;
1293 int ret;
1294
1295 ctx = nfs4_state_find_open_context(state);
1296 if (IS_ERR(ctx))
1297 return PTR_ERR(ctx);
1298 ret = nfs4_do_open_reclaim(ctx, state);
1299 put_nfs_open_context(ctx);
1300 return ret;
1301}
1302
1303static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1304{
1305 struct nfs4_opendata *opendata;
1306 int ret;
1307
1308 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1309 if (IS_ERR(opendata))
1310 return PTR_ERR(opendata);
1311 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1312 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1313 ret = nfs4_open_recover(opendata, state);
1314 nfs4_opendata_put(opendata);
1315 return ret;
1316}
1317
1318int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1319{
1320 struct nfs4_exception exception = { };
1321 struct nfs_server *server = NFS_SERVER(state->inode);
1322 int err;
1323 do {
1324 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1325 switch (err) {
1326 case 0:
1327 case -ENOENT:
1328 case -ESTALE:
1329 goto out;
1330 case -NFS4ERR_BADSESSION:
1331 case -NFS4ERR_BADSLOT:
1332 case -NFS4ERR_BAD_HIGH_SLOT:
1333 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1334 case -NFS4ERR_DEADSESSION:
1335 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1336 goto out;
1337 case -NFS4ERR_STALE_CLIENTID:
1338 case -NFS4ERR_STALE_STATEID:
1339 case -NFS4ERR_EXPIRED:
1340 /* Don't recall a delegation if it was lost */
1341 nfs4_schedule_lease_recovery(server->nfs_client);
1342 goto out;
1343 case -ERESTARTSYS:
1344 /*
1345 * The show must go on: exit, but mark the
1346 * stateid as needing recovery.
1347 */
1348 case -NFS4ERR_DELEG_REVOKED:
1349 case -NFS4ERR_ADMIN_REVOKED:
1350 case -NFS4ERR_BAD_STATEID:
1351 nfs_inode_find_state_and_recover(state->inode,
1352 stateid);
1353 nfs4_schedule_stateid_recovery(server, state);
1354 case -EKEYEXPIRED:
1355 /*
1356 * User RPCSEC_GSS context has expired.
1357 * We cannot recover this stateid now, so
1358 * skip it and allow recovery thread to
1359 * proceed.
1360 */
1361 case -ENOMEM:
1362 err = 0;
1363 goto out;
1364 }
1365 err = nfs4_handle_exception(server, err, &exception);
1366 } while (exception.retry);
1367out:
1368 return err;
1369}
1370
1371static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1372{
1373 struct nfs4_opendata *data = calldata;
1374
1375 data->rpc_status = task->tk_status;
1376 if (data->rpc_status == 0) {
1377 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1378 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1379 renew_lease(data->o_res.server, data->timestamp);
1380 data->rpc_done = 1;
1381 }
1382}
1383
1384static void nfs4_open_confirm_release(void *calldata)
1385{
1386 struct nfs4_opendata *data = calldata;
1387 struct nfs4_state *state = NULL;
1388
1389 /* If this request hasn't been cancelled, do nothing */
1390 if (data->cancelled == 0)
1391 goto out_free;
1392 /* In case of error, no cleanup! */
1393 if (!data->rpc_done)
1394 goto out_free;
1395 state = nfs4_opendata_to_nfs4_state(data);
1396 if (!IS_ERR(state))
1397 nfs4_close_state(state, data->o_arg.fmode);
1398out_free:
1399 nfs4_opendata_put(data);
1400}
1401
1402static const struct rpc_call_ops nfs4_open_confirm_ops = {
1403 .rpc_call_done = nfs4_open_confirm_done,
1404 .rpc_release = nfs4_open_confirm_release,
1405};
1406
1407/*
1408 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1409 */
1410static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1411{
1412 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1413 struct rpc_task *task;
1414 struct rpc_message msg = {
1415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1416 .rpc_argp = &data->c_arg,
1417 .rpc_resp = &data->c_res,
1418 .rpc_cred = data->owner->so_cred,
1419 };
1420 struct rpc_task_setup task_setup_data = {
1421 .rpc_client = server->client,
1422 .rpc_message = &msg,
1423 .callback_ops = &nfs4_open_confirm_ops,
1424 .callback_data = data,
1425 .workqueue = nfsiod_workqueue,
1426 .flags = RPC_TASK_ASYNC,
1427 };
1428 int status;
1429
1430 kref_get(&data->kref);
1431 data->rpc_done = 0;
1432 data->rpc_status = 0;
1433 data->timestamp = jiffies;
1434 task = rpc_run_task(&task_setup_data);
1435 if (IS_ERR(task))
1436 return PTR_ERR(task);
1437 status = nfs4_wait_for_completion_rpc_task(task);
1438 if (status != 0) {
1439 data->cancelled = 1;
1440 smp_wmb();
1441 } else
1442 status = data->rpc_status;
1443 rpc_put_task(task);
1444 return status;
1445}
1446
1447static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1448{
1449 struct nfs4_opendata *data = calldata;
1450 struct nfs4_state_owner *sp = data->owner;
1451
1452 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1453 return;
1454 /*
1455 * Check if we still need to send an OPEN call, or if we can use
1456 * a delegation instead.
1457 */
1458 if (data->state != NULL) {
1459 struct nfs_delegation *delegation;
1460
1461 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1462 goto out_no_action;
1463 rcu_read_lock();
1464 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1465 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1466 can_open_delegated(delegation, data->o_arg.fmode))
1467 goto unlock_no_action;
1468 rcu_read_unlock();
1469 }
1470 /* Update client id. */
1471 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1472 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1473 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1474 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1475 }
1476 data->timestamp = jiffies;
1477 if (nfs4_setup_sequence(data->o_arg.server,
1478 &data->o_arg.seq_args,
1479 &data->o_res.seq_res, task))
1480 return;
1481 rpc_call_start(task);
1482 return;
1483unlock_no_action:
1484 rcu_read_unlock();
1485out_no_action:
1486 task->tk_action = NULL;
1487
1488}
1489
1490static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1491{
1492 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1493 nfs4_open_prepare(task, calldata);
1494}
1495
1496static void nfs4_open_done(struct rpc_task *task, void *calldata)
1497{
1498 struct nfs4_opendata *data = calldata;
1499
1500 data->rpc_status = task->tk_status;
1501
1502 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1503 return;
1504
1505 if (task->tk_status == 0) {
1506 switch (data->o_res.f_attr->mode & S_IFMT) {
1507 case S_IFREG:
1508 break;
1509 case S_IFLNK:
1510 data->rpc_status = -ELOOP;
1511 break;
1512 case S_IFDIR:
1513 data->rpc_status = -EISDIR;
1514 break;
1515 default:
1516 data->rpc_status = -ENOTDIR;
1517 }
1518 renew_lease(data->o_res.server, data->timestamp);
1519 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1520 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1521 }
1522 data->rpc_done = 1;
1523}
1524
1525static void nfs4_open_release(void *calldata)
1526{
1527 struct nfs4_opendata *data = calldata;
1528 struct nfs4_state *state = NULL;
1529
1530 /* If this request hasn't been cancelled, do nothing */
1531 if (data->cancelled == 0)
1532 goto out_free;
1533 /* In case of error, no cleanup! */
1534 if (data->rpc_status != 0 || !data->rpc_done)
1535 goto out_free;
1536 /* In case we need an open_confirm, no cleanup! */
1537 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1538 goto out_free;
1539 state = nfs4_opendata_to_nfs4_state(data);
1540 if (!IS_ERR(state))
1541 nfs4_close_state(state, data->o_arg.fmode);
1542out_free:
1543 nfs4_opendata_put(data);
1544}
1545
1546static const struct rpc_call_ops nfs4_open_ops = {
1547 .rpc_call_prepare = nfs4_open_prepare,
1548 .rpc_call_done = nfs4_open_done,
1549 .rpc_release = nfs4_open_release,
1550};
1551
1552static const struct rpc_call_ops nfs4_recover_open_ops = {
1553 .rpc_call_prepare = nfs4_recover_open_prepare,
1554 .rpc_call_done = nfs4_open_done,
1555 .rpc_release = nfs4_open_release,
1556};
1557
1558static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1559{
1560 struct inode *dir = data->dir->d_inode;
1561 struct nfs_server *server = NFS_SERVER(dir);
1562 struct nfs_openargs *o_arg = &data->o_arg;
1563 struct nfs_openres *o_res = &data->o_res;
1564 struct rpc_task *task;
1565 struct rpc_message msg = {
1566 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1567 .rpc_argp = o_arg,
1568 .rpc_resp = o_res,
1569 .rpc_cred = data->owner->so_cred,
1570 };
1571 struct rpc_task_setup task_setup_data = {
1572 .rpc_client = server->client,
1573 .rpc_message = &msg,
1574 .callback_ops = &nfs4_open_ops,
1575 .callback_data = data,
1576 .workqueue = nfsiod_workqueue,
1577 .flags = RPC_TASK_ASYNC,
1578 };
1579 int status;
1580
1581 nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1582 kref_get(&data->kref);
1583 data->rpc_done = 0;
1584 data->rpc_status = 0;
1585 data->cancelled = 0;
1586 if (isrecover)
1587 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1588 task = rpc_run_task(&task_setup_data);
1589 if (IS_ERR(task))
1590 return PTR_ERR(task);
1591 status = nfs4_wait_for_completion_rpc_task(task);
1592 if (status != 0) {
1593 data->cancelled = 1;
1594 smp_wmb();
1595 } else
1596 status = data->rpc_status;
1597 rpc_put_task(task);
1598
1599 return status;
1600}
1601
1602static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1603{
1604 struct inode *dir = data->dir->d_inode;
1605 struct nfs_openres *o_res = &data->o_res;
1606 int status;
1607
1608 status = nfs4_run_open_task(data, 1);
1609 if (status != 0 || !data->rpc_done)
1610 return status;
1611
1612 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1613
1614 nfs_refresh_inode(dir, o_res->dir_attr);
1615
1616 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1617 status = _nfs4_proc_open_confirm(data);
1618 if (status != 0)
1619 return status;
1620 }
1621
1622 return status;
1623}
1624
1625/*
1626 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1627 */
1628static int _nfs4_proc_open(struct nfs4_opendata *data)
1629{
1630 struct inode *dir = data->dir->d_inode;
1631 struct nfs_server *server = NFS_SERVER(dir);
1632 struct nfs_openargs *o_arg = &data->o_arg;
1633 struct nfs_openres *o_res = &data->o_res;
1634 int status;
1635
1636 status = nfs4_run_open_task(data, 0);
1637 if (!data->rpc_done)
1638 return status;
1639 if (status != 0) {
1640 if (status == -NFS4ERR_BADNAME &&
1641 !(o_arg->open_flags & O_CREAT))
1642 return -ENOENT;
1643 return status;
1644 }
1645
1646 nfs_fattr_map_and_free_names(server, &data->f_attr);
1647
1648 if (o_arg->open_flags & O_CREAT) {
1649 update_changeattr(dir, &o_res->cinfo);
1650 nfs_post_op_update_inode(dir, o_res->dir_attr);
1651 } else
1652 nfs_refresh_inode(dir, o_res->dir_attr);
1653 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1654 server->caps &= ~NFS_CAP_POSIX_LOCK;
1655 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1656 status = _nfs4_proc_open_confirm(data);
1657 if (status != 0)
1658 return status;
1659 }
1660 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1661 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1662 return 0;
1663}
1664
1665static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1666{
1667 unsigned int loop;
1668 int ret;
1669
1670 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1671 ret = nfs4_wait_clnt_recover(clp);
1672 if (ret != 0)
1673 break;
1674 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1675 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1676 break;
1677 nfs4_schedule_state_manager(clp);
1678 ret = -EIO;
1679 }
1680 return ret;
1681}
1682
1683static int nfs4_recover_expired_lease(struct nfs_server *server)
1684{
1685 return nfs4_client_recover_expired_lease(server->nfs_client);
1686}
1687
1688/*
1689 * OPEN_EXPIRED:
1690 * reclaim state on the server after a network partition.
1691 * Assumes caller holds the appropriate lock
1692 */
1693static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1694{
1695 struct nfs4_opendata *opendata;
1696 int ret;
1697
1698 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1699 if (IS_ERR(opendata))
1700 return PTR_ERR(opendata);
1701 ret = nfs4_open_recover(opendata, state);
1702 if (ret == -ESTALE)
1703 d_drop(ctx->dentry);
1704 nfs4_opendata_put(opendata);
1705 return ret;
1706}
1707
1708static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1709{
1710 struct nfs_server *server = NFS_SERVER(state->inode);
1711 struct nfs4_exception exception = { };
1712 int err;
1713
1714 do {
1715 err = _nfs4_open_expired(ctx, state);
1716 switch (err) {
1717 default:
1718 goto out;
1719 case -NFS4ERR_GRACE:
1720 case -NFS4ERR_DELAY:
1721 nfs4_handle_exception(server, err, &exception);
1722 err = 0;
1723 }
1724 } while (exception.retry);
1725out:
1726 return err;
1727}
1728
1729static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1730{
1731 struct nfs_open_context *ctx;
1732 int ret;
1733
1734 ctx = nfs4_state_find_open_context(state);
1735 if (IS_ERR(ctx))
1736 return PTR_ERR(ctx);
1737 ret = nfs4_do_open_expired(ctx, state);
1738 put_nfs_open_context(ctx);
1739 return ret;
1740}
1741
1742#if defined(CONFIG_NFS_V4_1)
1743static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1744{
1745 int status = NFS_OK;
1746 struct nfs_server *server = NFS_SERVER(state->inode);
1747
1748 if (state->flags & flags) {
1749 status = nfs41_test_stateid(server, stateid);
1750 if (status != NFS_OK) {
1751 nfs41_free_stateid(server, stateid);
1752 state->flags &= ~flags;
1753 }
1754 }
1755 return status;
1756}
1757
1758static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1759{
1760 int deleg_status, open_status;
1761 int deleg_flags = 1 << NFS_DELEGATED_STATE;
1762 int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1763
1764 deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1765 open_status = nfs41_check_expired_stateid(state, &state->open_stateid, open_flags);
1766
1767 if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1768 return NFS_OK;
1769 return nfs4_open_expired(sp, state);
1770}
1771#endif
1772
1773/*
1774 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1775 * fields corresponding to attributes that were used to store the verifier.
1776 * Make sure we clobber those fields in the later setattr call
1777 */
1778static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1779{
1780 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1781 !(sattr->ia_valid & ATTR_ATIME_SET))
1782 sattr->ia_valid |= ATTR_ATIME;
1783
1784 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1785 !(sattr->ia_valid & ATTR_MTIME_SET))
1786 sattr->ia_valid |= ATTR_MTIME;
1787}
1788
1789/*
1790 * Returns a referenced nfs4_state
1791 */
1792static 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)
1793{
1794 struct nfs4_state_owner *sp;
1795 struct nfs4_state *state = NULL;
1796 struct nfs_server *server = NFS_SERVER(dir);
1797 struct nfs4_opendata *opendata;
1798 int status;
1799
1800 /* Protect against reboot recovery conflicts */
1801 status = -ENOMEM;
1802 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1803 if (sp == NULL) {
1804 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1805 goto out_err;
1806 }
1807 status = nfs4_recover_expired_lease(server);
1808 if (status != 0)
1809 goto err_put_state_owner;
1810 if (dentry->d_inode != NULL)
1811 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1812 status = -ENOMEM;
1813 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1814 if (opendata == NULL)
1815 goto err_put_state_owner;
1816
1817 if (dentry->d_inode != NULL)
1818 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1819
1820 status = _nfs4_proc_open(opendata);
1821 if (status != 0)
1822 goto err_opendata_put;
1823
1824 state = nfs4_opendata_to_nfs4_state(opendata);
1825 status = PTR_ERR(state);
1826 if (IS_ERR(state))
1827 goto err_opendata_put;
1828 if (server->caps & NFS_CAP_POSIX_LOCK)
1829 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1830
1831 if (opendata->o_arg.open_flags & O_EXCL) {
1832 nfs4_exclusive_attrset(opendata, sattr);
1833
1834 nfs_fattr_init(opendata->o_res.f_attr);
1835 status = nfs4_do_setattr(state->inode, cred,
1836 opendata->o_res.f_attr, sattr,
1837 state);
1838 if (status == 0)
1839 nfs_setattr_update_inode(state->inode, sattr);
1840 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1841 }
1842 nfs4_opendata_put(opendata);
1843 nfs4_put_state_owner(sp);
1844 *res = state;
1845 return 0;
1846err_opendata_put:
1847 nfs4_opendata_put(opendata);
1848err_put_state_owner:
1849 nfs4_put_state_owner(sp);
1850out_err:
1851 *res = NULL;
1852 return status;
1853}
1854
1855
1856static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1857{
1858 struct nfs4_exception exception = { };
1859 struct nfs4_state *res;
1860 int status;
1861
1862 do {
1863 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1864 if (status == 0)
1865 break;
1866 /* NOTE: BAD_SEQID means the server and client disagree about the
1867 * book-keeping w.r.t. state-changing operations
1868 * (OPEN/CLOSE/LOCK/LOCKU...)
1869 * It is actually a sign of a bug on the client or on the server.
1870 *
1871 * If we receive a BAD_SEQID error in the particular case of
1872 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1873 * have unhashed the old state_owner for us, and that we can
1874 * therefore safely retry using a new one. We should still warn
1875 * the user though...
1876 */
1877 if (status == -NFS4ERR_BAD_SEQID) {
1878 pr_warn_ratelimited("NFS: v4 server %s "
1879 " returned a bad sequence-id error!\n",
1880 NFS_SERVER(dir)->nfs_client->cl_hostname);
1881 exception.retry = 1;
1882 continue;
1883 }
1884 /*
1885 * BAD_STATEID on OPEN means that the server cancelled our
1886 * state before it received the OPEN_CONFIRM.
1887 * Recover by retrying the request as per the discussion
1888 * on Page 181 of RFC3530.
1889 */
1890 if (status == -NFS4ERR_BAD_STATEID) {
1891 exception.retry = 1;
1892 continue;
1893 }
1894 if (status == -EAGAIN) {
1895 /* We must have found a delegation */
1896 exception.retry = 1;
1897 continue;
1898 }
1899 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1900 status, &exception));
1901 } while (exception.retry);
1902 return res;
1903}
1904
1905static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1906 struct nfs_fattr *fattr, struct iattr *sattr,
1907 struct nfs4_state *state)
1908{
1909 struct nfs_server *server = NFS_SERVER(inode);
1910 struct nfs_setattrargs arg = {
1911 .fh = NFS_FH(inode),
1912 .iap = sattr,
1913 .server = server,
1914 .bitmask = server->attr_bitmask,
1915 };
1916 struct nfs_setattrres res = {
1917 .fattr = fattr,
1918 .server = server,
1919 };
1920 struct rpc_message msg = {
1921 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1922 .rpc_argp = &arg,
1923 .rpc_resp = &res,
1924 .rpc_cred = cred,
1925 };
1926 unsigned long timestamp = jiffies;
1927 int status;
1928
1929 nfs_fattr_init(fattr);
1930
1931 if (state != NULL) {
1932 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1933 current->files, current->tgid);
1934 } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1935 FMODE_WRITE)) {
1936 /* Use that stateid */
1937 } else
1938 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1939
1940 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1941 if (status == 0 && state != NULL)
1942 renew_lease(server, timestamp);
1943 return status;
1944}
1945
1946static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1947 struct nfs_fattr *fattr, struct iattr *sattr,
1948 struct nfs4_state *state)
1949{
1950 struct nfs_server *server = NFS_SERVER(inode);
1951 struct nfs4_exception exception = {
1952 .state = state,
1953 .inode = inode,
1954 };
1955 int err;
1956 do {
1957 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1958 switch (err) {
1959 case -NFS4ERR_OPENMODE:
1960 if (state && !(state->state & FMODE_WRITE)) {
1961 err = -EBADF;
1962 if (sattr->ia_valid & ATTR_OPEN)
1963 err = -EACCES;
1964 goto out;
1965 }
1966 }
1967 err = nfs4_handle_exception(server, err, &exception);
1968 } while (exception.retry);
1969out:
1970 return err;
1971}
1972
1973struct nfs4_closedata {
1974 struct inode *inode;
1975 struct nfs4_state *state;
1976 struct nfs_closeargs arg;
1977 struct nfs_closeres res;
1978 struct nfs_fattr fattr;
1979 unsigned long timestamp;
1980 bool roc;
1981 u32 roc_barrier;
1982};
1983
1984static void nfs4_free_closedata(void *data)
1985{
1986 struct nfs4_closedata *calldata = data;
1987 struct nfs4_state_owner *sp = calldata->state->owner;
1988 struct super_block *sb = calldata->state->inode->i_sb;
1989
1990 if (calldata->roc)
1991 pnfs_roc_release(calldata->state->inode);
1992 nfs4_put_open_state(calldata->state);
1993 nfs_free_seqid(calldata->arg.seqid);
1994 nfs4_put_state_owner(sp);
1995 nfs_sb_deactive(sb);
1996 kfree(calldata);
1997}
1998
1999static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2000 fmode_t fmode)
2001{
2002 spin_lock(&state->owner->so_lock);
2003 if (!(fmode & FMODE_READ))
2004 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2005 if (!(fmode & FMODE_WRITE))
2006 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2007 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2008 spin_unlock(&state->owner->so_lock);
2009}
2010
2011static void nfs4_close_done(struct rpc_task *task, void *data)
2012{
2013 struct nfs4_closedata *calldata = data;
2014 struct nfs4_state *state = calldata->state;
2015 struct nfs_server *server = NFS_SERVER(calldata->inode);
2016
2017 dprintk("%s: begin!\n", __func__);
2018 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2019 return;
2020 /* hmm. we are done with the inode, and in the process of freeing
2021 * the state_owner. we keep this around to process errors
2022 */
2023 switch (task->tk_status) {
2024 case 0:
2025 if (calldata->roc)
2026 pnfs_roc_set_barrier(state->inode,
2027 calldata->roc_barrier);
2028 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2029 renew_lease(server, calldata->timestamp);
2030 nfs4_close_clear_stateid_flags(state,
2031 calldata->arg.fmode);
2032 break;
2033 case -NFS4ERR_STALE_STATEID:
2034 case -NFS4ERR_OLD_STATEID:
2035 case -NFS4ERR_BAD_STATEID:
2036 case -NFS4ERR_EXPIRED:
2037 if (calldata->arg.fmode == 0)
2038 break;
2039 default:
2040 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2041 rpc_restart_call_prepare(task);
2042 }
2043 nfs_release_seqid(calldata->arg.seqid);
2044 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2045 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2046}
2047
2048static void nfs4_close_prepare(struct rpc_task *task, void *data)
2049{
2050 struct nfs4_closedata *calldata = data;
2051 struct nfs4_state *state = calldata->state;
2052 int call_close = 0;
2053
2054 dprintk("%s: begin!\n", __func__);
2055 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2056 return;
2057
2058 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2059 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2060 spin_lock(&state->owner->so_lock);
2061 /* Calculate the change in open mode */
2062 if (state->n_rdwr == 0) {
2063 if (state->n_rdonly == 0) {
2064 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2065 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2066 calldata->arg.fmode &= ~FMODE_READ;
2067 }
2068 if (state->n_wronly == 0) {
2069 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2070 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2071 calldata->arg.fmode &= ~FMODE_WRITE;
2072 }
2073 }
2074 spin_unlock(&state->owner->so_lock);
2075
2076 if (!call_close) {
2077 /* Note: exit _without_ calling nfs4_close_done */
2078 task->tk_action = NULL;
2079 goto out;
2080 }
2081
2082 if (calldata->arg.fmode == 0) {
2083 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2084 if (calldata->roc &&
2085 pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2086 rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2087 task, NULL);
2088 goto out;
2089 }
2090 }
2091
2092 nfs_fattr_init(calldata->res.fattr);
2093 calldata->timestamp = jiffies;
2094 if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2095 &calldata->arg.seq_args,
2096 &calldata->res.seq_res,
2097 task))
2098 goto out;
2099 rpc_call_start(task);
2100out:
2101 dprintk("%s: done!\n", __func__);
2102}
2103
2104static const struct rpc_call_ops nfs4_close_ops = {
2105 .rpc_call_prepare = nfs4_close_prepare,
2106 .rpc_call_done = nfs4_close_done,
2107 .rpc_release = nfs4_free_closedata,
2108};
2109
2110/*
2111 * It is possible for data to be read/written from a mem-mapped file
2112 * after the sys_close call (which hits the vfs layer as a flush).
2113 * This means that we can't safely call nfsv4 close on a file until
2114 * the inode is cleared. This in turn means that we are not good
2115 * NFSv4 citizens - we do not indicate to the server to update the file's
2116 * share state even when we are done with one of the three share
2117 * stateid's in the inode.
2118 *
2119 * NOTE: Caller must be holding the sp->so_owner semaphore!
2120 */
2121int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2122{
2123 struct nfs_server *server = NFS_SERVER(state->inode);
2124 struct nfs4_closedata *calldata;
2125 struct nfs4_state_owner *sp = state->owner;
2126 struct rpc_task *task;
2127 struct rpc_message msg = {
2128 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2129 .rpc_cred = state->owner->so_cred,
2130 };
2131 struct rpc_task_setup task_setup_data = {
2132 .rpc_client = server->client,
2133 .rpc_message = &msg,
2134 .callback_ops = &nfs4_close_ops,
2135 .workqueue = nfsiod_workqueue,
2136 .flags = RPC_TASK_ASYNC,
2137 };
2138 int status = -ENOMEM;
2139
2140 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2141 if (calldata == NULL)
2142 goto out;
2143 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2144 calldata->inode = state->inode;
2145 calldata->state = state;
2146 calldata->arg.fh = NFS_FH(state->inode);
2147 calldata->arg.stateid = &state->open_stateid;
2148 /* Serialization for the sequence id */
2149 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2150 if (calldata->arg.seqid == NULL)
2151 goto out_free_calldata;
2152 calldata->arg.fmode = 0;
2153 calldata->arg.bitmask = server->cache_consistency_bitmask;
2154 calldata->res.fattr = &calldata->fattr;
2155 calldata->res.seqid = calldata->arg.seqid;
2156 calldata->res.server = server;
2157 calldata->roc = roc;
2158 nfs_sb_active(calldata->inode->i_sb);
2159
2160 msg.rpc_argp = &calldata->arg;
2161 msg.rpc_resp = &calldata->res;
2162 task_setup_data.callback_data = calldata;
2163 task = rpc_run_task(&task_setup_data);
2164 if (IS_ERR(task))
2165 return PTR_ERR(task);
2166 status = 0;
2167 if (wait)
2168 status = rpc_wait_for_completion_task(task);
2169 rpc_put_task(task);
2170 return status;
2171out_free_calldata:
2172 kfree(calldata);
2173out:
2174 if (roc)
2175 pnfs_roc_release(state->inode);
2176 nfs4_put_open_state(state);
2177 nfs4_put_state_owner(sp);
2178 return status;
2179}
2180
2181static struct inode *
2182nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2183{
2184 struct nfs4_state *state;
2185
2186 /* Protect against concurrent sillydeletes */
2187 state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2188 if (IS_ERR(state))
2189 return ERR_CAST(state);
2190 ctx->state = state;
2191 return igrab(state->inode);
2192}
2193
2194static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2195{
2196 if (ctx->state == NULL)
2197 return;
2198 if (is_sync)
2199 nfs4_close_sync(ctx->state, ctx->mode);
2200 else
2201 nfs4_close_state(ctx->state, ctx->mode);
2202}
2203
2204static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2205{
2206 struct nfs4_server_caps_arg args = {
2207 .fhandle = fhandle,
2208 };
2209 struct nfs4_server_caps_res res = {};
2210 struct rpc_message msg = {
2211 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2212 .rpc_argp = &args,
2213 .rpc_resp = &res,
2214 };
2215 int status;
2216
2217 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2218 if (status == 0) {
2219 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2220 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2221 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2222 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2223 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2224 NFS_CAP_CTIME|NFS_CAP_MTIME);
2225 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2226 server->caps |= NFS_CAP_ACLS;
2227 if (res.has_links != 0)
2228 server->caps |= NFS_CAP_HARDLINKS;
2229 if (res.has_symlinks != 0)
2230 server->caps |= NFS_CAP_SYMLINKS;
2231 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2232 server->caps |= NFS_CAP_FILEID;
2233 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2234 server->caps |= NFS_CAP_MODE;
2235 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2236 server->caps |= NFS_CAP_NLINK;
2237 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2238 server->caps |= NFS_CAP_OWNER;
2239 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2240 server->caps |= NFS_CAP_OWNER_GROUP;
2241 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2242 server->caps |= NFS_CAP_ATIME;
2243 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2244 server->caps |= NFS_CAP_CTIME;
2245 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2246 server->caps |= NFS_CAP_MTIME;
2247
2248 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2249 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2250 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2251 server->acl_bitmask = res.acl_bitmask;
2252 server->fh_expire_type = res.fh_expire_type;
2253 }
2254
2255 return status;
2256}
2257
2258int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2259{
2260 struct nfs4_exception exception = { };
2261 int err;
2262 do {
2263 err = nfs4_handle_exception(server,
2264 _nfs4_server_capabilities(server, fhandle),
2265 &exception);
2266 } while (exception.retry);
2267 return err;
2268}
2269
2270static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2271 struct nfs_fsinfo *info)
2272{
2273 struct nfs4_lookup_root_arg args = {
2274 .bitmask = nfs4_fattr_bitmap,
2275 };
2276 struct nfs4_lookup_res res = {
2277 .server = server,
2278 .fattr = info->fattr,
2279 .fh = fhandle,
2280 };
2281 struct rpc_message msg = {
2282 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2283 .rpc_argp = &args,
2284 .rpc_resp = &res,
2285 };
2286
2287 nfs_fattr_init(info->fattr);
2288 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2289}
2290
2291static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2292 struct nfs_fsinfo *info)
2293{
2294 struct nfs4_exception exception = { };
2295 int err;
2296 do {
2297 err = _nfs4_lookup_root(server, fhandle, info);
2298 switch (err) {
2299 case 0:
2300 case -NFS4ERR_WRONGSEC:
2301 goto out;
2302 default:
2303 err = nfs4_handle_exception(server, err, &exception);
2304 }
2305 } while (exception.retry);
2306out:
2307 return err;
2308}
2309
2310static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2311 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2312{
2313 struct rpc_auth *auth;
2314 int ret;
2315
2316 auth = rpcauth_create(flavor, server->client);
2317 if (!auth) {
2318 ret = -EIO;
2319 goto out;
2320 }
2321 ret = nfs4_lookup_root(server, fhandle, info);
2322out:
2323 return ret;
2324}
2325
2326static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2327 struct nfs_fsinfo *info)
2328{
2329 int i, len, status = 0;
2330 rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2331
2332 len = gss_mech_list_pseudoflavors(&flav_array[0]);
2333 flav_array[len] = RPC_AUTH_NULL;
2334 len += 1;
2335
2336 for (i = 0; i < len; i++) {
2337 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2338 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2339 continue;
2340 break;
2341 }
2342 /*
2343 * -EACCESS could mean that the user doesn't have correct permissions
2344 * to access the mount. It could also mean that we tried to mount
2345 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2346 * existing mount programs don't handle -EACCES very well so it should
2347 * be mapped to -EPERM instead.
2348 */
2349 if (status == -EACCES)
2350 status = -EPERM;
2351 return status;
2352}
2353
2354/*
2355 * get the file handle for the "/" directory on the server
2356 */
2357static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2358 struct nfs_fsinfo *info)
2359{
2360 int minor_version = server->nfs_client->cl_minorversion;
2361 int status = nfs4_lookup_root(server, fhandle, info);
2362 if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2363 /*
2364 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2365 * by nfs4_map_errors() as this function exits.
2366 */
2367 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2368 if (status == 0)
2369 status = nfs4_server_capabilities(server, fhandle);
2370 if (status == 0)
2371 status = nfs4_do_fsinfo(server, fhandle, info);
2372 return nfs4_map_errors(status);
2373}
2374
2375/*
2376 * Get locations and (maybe) other attributes of a referral.
2377 * Note that we'll actually follow the referral later when
2378 * we detect fsid mismatch in inode revalidation
2379 */
2380static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2381 const struct qstr *name, struct nfs_fattr *fattr,
2382 struct nfs_fh *fhandle)
2383{
2384 int status = -ENOMEM;
2385 struct page *page = NULL;
2386 struct nfs4_fs_locations *locations = NULL;
2387
2388 page = alloc_page(GFP_KERNEL);
2389 if (page == NULL)
2390 goto out;
2391 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2392 if (locations == NULL)
2393 goto out;
2394
2395 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2396 if (status != 0)
2397 goto out;
2398 /* Make sure server returned a different fsid for the referral */
2399 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2400 dprintk("%s: server did not return a different fsid for"
2401 " a referral at %s\n", __func__, name->name);
2402 status = -EIO;
2403 goto out;
2404 }
2405 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2406 nfs_fixup_referral_attributes(&locations->fattr);
2407
2408 /* replace the lookup nfs_fattr with the locations nfs_fattr */
2409 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2410 memset(fhandle, 0, sizeof(struct nfs_fh));
2411out:
2412 if (page)
2413 __free_page(page);
2414 kfree(locations);
2415 return status;
2416}
2417
2418static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2419{
2420 struct nfs4_getattr_arg args = {
2421 .fh = fhandle,
2422 .bitmask = server->attr_bitmask,
2423 };
2424 struct nfs4_getattr_res res = {
2425 .fattr = fattr,
2426 .server = server,
2427 };
2428 struct rpc_message msg = {
2429 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2430 .rpc_argp = &args,
2431 .rpc_resp = &res,
2432 };
2433
2434 nfs_fattr_init(fattr);
2435 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2436}
2437
2438static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2439{
2440 struct nfs4_exception exception = { };
2441 int err;
2442 do {
2443 err = nfs4_handle_exception(server,
2444 _nfs4_proc_getattr(server, fhandle, fattr),
2445 &exception);
2446 } while (exception.retry);
2447 return err;
2448}
2449
2450/*
2451 * The file is not closed if it is opened due to the a request to change
2452 * the size of the file. The open call will not be needed once the
2453 * VFS layer lookup-intents are implemented.
2454 *
2455 * Close is called when the inode is destroyed.
2456 * If we haven't opened the file for O_WRONLY, we
2457 * need to in the size_change case to obtain a stateid.
2458 *
2459 * Got race?
2460 * Because OPEN is always done by name in nfsv4, it is
2461 * possible that we opened a different file by the same
2462 * name. We can recognize this race condition, but we
2463 * can't do anything about it besides returning an error.
2464 *
2465 * This will be fixed with VFS changes (lookup-intent).
2466 */
2467static int
2468nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2469 struct iattr *sattr)
2470{
2471 struct inode *inode = dentry->d_inode;
2472 struct rpc_cred *cred = NULL;
2473 struct nfs4_state *state = NULL;
2474 int status;
2475
2476 if (pnfs_ld_layoutret_on_setattr(inode))
2477 pnfs_return_layout(inode);
2478
2479 nfs_fattr_init(fattr);
2480
2481 /* Search for an existing open(O_WRITE) file */
2482 if (sattr->ia_valid & ATTR_FILE) {
2483 struct nfs_open_context *ctx;
2484
2485 ctx = nfs_file_open_context(sattr->ia_file);
2486 if (ctx) {
2487 cred = ctx->cred;
2488 state = ctx->state;
2489 }
2490 }
2491
2492 /* Deal with open(O_TRUNC) */
2493 if (sattr->ia_valid & ATTR_OPEN)
2494 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2495
2496 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2497 if (status == 0)
2498 nfs_setattr_update_inode(inode, sattr);
2499 return status;
2500}
2501
2502static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2503 const struct qstr *name, struct nfs_fh *fhandle,
2504 struct nfs_fattr *fattr)
2505{
2506 struct nfs_server *server = NFS_SERVER(dir);
2507 int status;
2508 struct nfs4_lookup_arg args = {
2509 .bitmask = server->attr_bitmask,
2510 .dir_fh = NFS_FH(dir),
2511 .name = name,
2512 };
2513 struct nfs4_lookup_res res = {
2514 .server = server,
2515 .fattr = fattr,
2516 .fh = fhandle,
2517 };
2518 struct rpc_message msg = {
2519 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2520 .rpc_argp = &args,
2521 .rpc_resp = &res,
2522 };
2523
2524 nfs_fattr_init(fattr);
2525
2526 dprintk("NFS call lookup %s\n", name->name);
2527 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2528 dprintk("NFS reply lookup: %d\n", status);
2529 return status;
2530}
2531
2532static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2533{
2534 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2535 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2536 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2537 fattr->nlink = 2;
2538}
2539
2540static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2541 struct qstr *name, struct nfs_fh *fhandle,
2542 struct nfs_fattr *fattr)
2543{
2544 struct nfs4_exception exception = { };
2545 struct rpc_clnt *client = *clnt;
2546 int err;
2547 do {
2548 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2549 switch (err) {
2550 case -NFS4ERR_BADNAME:
2551 err = -ENOENT;
2552 goto out;
2553 case -NFS4ERR_MOVED:
2554 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2555 goto out;
2556 case -NFS4ERR_WRONGSEC:
2557 err = -EPERM;
2558 if (client != *clnt)
2559 goto out;
2560
2561 client = nfs4_create_sec_client(client, dir, name);
2562 if (IS_ERR(client))
2563 return PTR_ERR(client);
2564
2565 exception.retry = 1;
2566 break;
2567 default:
2568 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2569 }
2570 } while (exception.retry);
2571
2572out:
2573 if (err == 0)
2574 *clnt = client;
2575 else if (client != *clnt)
2576 rpc_shutdown_client(client);
2577
2578 return err;
2579}
2580
2581static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2582 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2583{
2584 int status;
2585 struct rpc_clnt *client = NFS_CLIENT(dir);
2586
2587 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2588 if (client != NFS_CLIENT(dir)) {
2589 rpc_shutdown_client(client);
2590 nfs_fixup_secinfo_attributes(fattr);
2591 }
2592 return status;
2593}
2594
2595struct rpc_clnt *
2596nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2597 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2598{
2599 int status;
2600 struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2601
2602 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2603 if (status < 0) {
2604 rpc_shutdown_client(client);
2605 return ERR_PTR(status);
2606 }
2607 return client;
2608}
2609
2610static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2611{
2612 struct nfs_server *server = NFS_SERVER(inode);
2613 struct nfs4_accessargs args = {
2614 .fh = NFS_FH(inode),
2615 .bitmask = server->cache_consistency_bitmask,
2616 };
2617 struct nfs4_accessres res = {
2618 .server = server,
2619 };
2620 struct rpc_message msg = {
2621 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2622 .rpc_argp = &args,
2623 .rpc_resp = &res,
2624 .rpc_cred = entry->cred,
2625 };
2626 int mode = entry->mask;
2627 int status;
2628
2629 /*
2630 * Determine which access bits we want to ask for...
2631 */
2632 if (mode & MAY_READ)
2633 args.access |= NFS4_ACCESS_READ;
2634 if (S_ISDIR(inode->i_mode)) {
2635 if (mode & MAY_WRITE)
2636 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2637 if (mode & MAY_EXEC)
2638 args.access |= NFS4_ACCESS_LOOKUP;
2639 } else {
2640 if (mode & MAY_WRITE)
2641 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2642 if (mode & MAY_EXEC)
2643 args.access |= NFS4_ACCESS_EXECUTE;
2644 }
2645
2646 res.fattr = nfs_alloc_fattr();
2647 if (res.fattr == NULL)
2648 return -ENOMEM;
2649
2650 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2651 if (!status) {
2652 entry->mask = 0;
2653 if (res.access & NFS4_ACCESS_READ)
2654 entry->mask |= MAY_READ;
2655 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2656 entry->mask |= MAY_WRITE;
2657 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2658 entry->mask |= MAY_EXEC;
2659 nfs_refresh_inode(inode, res.fattr);
2660 }
2661 nfs_free_fattr(res.fattr);
2662 return status;
2663}
2664
2665static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2666{
2667 struct nfs4_exception exception = { };
2668 int err;
2669 do {
2670 err = nfs4_handle_exception(NFS_SERVER(inode),
2671 _nfs4_proc_access(inode, entry),
2672 &exception);
2673 } while (exception.retry);
2674 return err;
2675}
2676
2677/*
2678 * TODO: For the time being, we don't try to get any attributes
2679 * along with any of the zero-copy operations READ, READDIR,
2680 * READLINK, WRITE.
2681 *
2682 * In the case of the first three, we want to put the GETATTR
2683 * after the read-type operation -- this is because it is hard
2684 * to predict the length of a GETATTR response in v4, and thus
2685 * align the READ data correctly. This means that the GETATTR
2686 * may end up partially falling into the page cache, and we should
2687 * shift it into the 'tail' of the xdr_buf before processing.
2688 * To do this efficiently, we need to know the total length
2689 * of data received, which doesn't seem to be available outside
2690 * of the RPC layer.
2691 *
2692 * In the case of WRITE, we also want to put the GETATTR after
2693 * the operation -- in this case because we want to make sure
2694 * we get the post-operation mtime and size. This means that
2695 * we can't use xdr_encode_pages() as written: we need a variant
2696 * of it which would leave room in the 'tail' iovec.
2697 *
2698 * Both of these changes to the XDR layer would in fact be quite
2699 * minor, but I decided to leave them for a subsequent patch.
2700 */
2701static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2702 unsigned int pgbase, unsigned int pglen)
2703{
2704 struct nfs4_readlink args = {
2705 .fh = NFS_FH(inode),
2706 .pgbase = pgbase,
2707 .pglen = pglen,
2708 .pages = &page,
2709 };
2710 struct nfs4_readlink_res res;
2711 struct rpc_message msg = {
2712 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2713 .rpc_argp = &args,
2714 .rpc_resp = &res,
2715 };
2716
2717 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2718}
2719
2720static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2721 unsigned int pgbase, unsigned int pglen)
2722{
2723 struct nfs4_exception exception = { };
2724 int err;
2725 do {
2726 err = nfs4_handle_exception(NFS_SERVER(inode),
2727 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2728 &exception);
2729 } while (exception.retry);
2730 return err;
2731}
2732
2733/*
2734 * Got race?
2735 * We will need to arrange for the VFS layer to provide an atomic open.
2736 * Until then, this create/open method is prone to inefficiency and race
2737 * conditions due to the lookup, create, and open VFS calls from sys_open()
2738 * placed on the wire.
2739 *
2740 * Given the above sorry state of affairs, I'm simply sending an OPEN.
2741 * The file will be opened again in the subsequent VFS open call
2742 * (nfs4_proc_file_open).
2743 *
2744 * The open for read will just hang around to be used by any process that
2745 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2746 */
2747
2748static int
2749nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2750 int flags, struct nfs_open_context *ctx)
2751{
2752 struct dentry *de = dentry;
2753 struct nfs4_state *state;
2754 struct rpc_cred *cred = NULL;
2755 fmode_t fmode = 0;
2756 int status = 0;
2757
2758 if (ctx != NULL) {
2759 cred = ctx->cred;
2760 de = ctx->dentry;
2761 fmode = ctx->mode;
2762 }
2763 sattr->ia_mode &= ~current_umask();
2764 state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2765 d_drop(dentry);
2766 if (IS_ERR(state)) {
2767 status = PTR_ERR(state);
2768 goto out;
2769 }
2770 d_add(dentry, igrab(state->inode));
2771 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2772 if (ctx != NULL)
2773 ctx->state = state;
2774 else
2775 nfs4_close_sync(state, fmode);
2776out:
2777 return status;
2778}
2779
2780static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2781{
2782 struct nfs_server *server = NFS_SERVER(dir);
2783 struct nfs_removeargs args = {
2784 .fh = NFS_FH(dir),
2785 .name.len = name->len,
2786 .name.name = name->name,
2787 .bitmask = server->attr_bitmask,
2788 };
2789 struct nfs_removeres res = {
2790 .server = server,
2791 };
2792 struct rpc_message msg = {
2793 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2794 .rpc_argp = &args,
2795 .rpc_resp = &res,
2796 };
2797 int status = -ENOMEM;
2798
2799 res.dir_attr = nfs_alloc_fattr();
2800 if (res.dir_attr == NULL)
2801 goto out;
2802
2803 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2804 if (status == 0) {
2805 update_changeattr(dir, &res.cinfo);
2806 nfs_post_op_update_inode(dir, res.dir_attr);
2807 }
2808 nfs_free_fattr(res.dir_attr);
2809out:
2810 return status;
2811}
2812
2813static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2814{
2815 struct nfs4_exception exception = { };
2816 int err;
2817 do {
2818 err = nfs4_handle_exception(NFS_SERVER(dir),
2819 _nfs4_proc_remove(dir, name),
2820 &exception);
2821 } while (exception.retry);
2822 return err;
2823}
2824
2825static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2826{
2827 struct nfs_server *server = NFS_SERVER(dir);
2828 struct nfs_removeargs *args = msg->rpc_argp;
2829 struct nfs_removeres *res = msg->rpc_resp;
2830
2831 args->bitmask = server->cache_consistency_bitmask;
2832 res->server = server;
2833 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2834 nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2835}
2836
2837static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2838{
2839 if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2840 &data->args.seq_args,
2841 &data->res.seq_res,
2842 task))
2843 return;
2844 rpc_call_start(task);
2845}
2846
2847static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2848{
2849 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2850
2851 if (!nfs4_sequence_done(task, &res->seq_res))
2852 return 0;
2853 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2854 return 0;
2855 update_changeattr(dir, &res->cinfo);
2856 nfs_post_op_update_inode(dir, res->dir_attr);
2857 return 1;
2858}
2859
2860static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2861{
2862 struct nfs_server *server = NFS_SERVER(dir);
2863 struct nfs_renameargs *arg = msg->rpc_argp;
2864 struct nfs_renameres *res = msg->rpc_resp;
2865
2866 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2867 arg->bitmask = server->attr_bitmask;
2868 res->server = server;
2869 nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2870}
2871
2872static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2873{
2874 if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2875 &data->args.seq_args,
2876 &data->res.seq_res,
2877 task))
2878 return;
2879 rpc_call_start(task);
2880}
2881
2882static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2883 struct inode *new_dir)
2884{
2885 struct nfs_renameres *res = task->tk_msg.rpc_resp;
2886
2887 if (!nfs4_sequence_done(task, &res->seq_res))
2888 return 0;
2889 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2890 return 0;
2891
2892 update_changeattr(old_dir, &res->old_cinfo);
2893 nfs_post_op_update_inode(old_dir, res->old_fattr);
2894 update_changeattr(new_dir, &res->new_cinfo);
2895 nfs_post_op_update_inode(new_dir, res->new_fattr);
2896 return 1;
2897}
2898
2899static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2900 struct inode *new_dir, struct qstr *new_name)
2901{
2902 struct nfs_server *server = NFS_SERVER(old_dir);
2903 struct nfs_renameargs arg = {
2904 .old_dir = NFS_FH(old_dir),
2905 .new_dir = NFS_FH(new_dir),
2906 .old_name = old_name,
2907 .new_name = new_name,
2908 .bitmask = server->attr_bitmask,
2909 };
2910 struct nfs_renameres res = {
2911 .server = server,
2912 };
2913 struct rpc_message msg = {
2914 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2915 .rpc_argp = &arg,
2916 .rpc_resp = &res,
2917 };
2918 int status = -ENOMEM;
2919
2920 res.old_fattr = nfs_alloc_fattr();
2921 res.new_fattr = nfs_alloc_fattr();
2922 if (res.old_fattr == NULL || res.new_fattr == NULL)
2923 goto out;
2924
2925 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2926 if (!status) {
2927 update_changeattr(old_dir, &res.old_cinfo);
2928 nfs_post_op_update_inode(old_dir, res.old_fattr);
2929 update_changeattr(new_dir, &res.new_cinfo);
2930 nfs_post_op_update_inode(new_dir, res.new_fattr);
2931 }
2932out:
2933 nfs_free_fattr(res.new_fattr);
2934 nfs_free_fattr(res.old_fattr);
2935 return status;
2936}
2937
2938static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2939 struct inode *new_dir, struct qstr *new_name)
2940{
2941 struct nfs4_exception exception = { };
2942 int err;
2943 do {
2944 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2945 _nfs4_proc_rename(old_dir, old_name,
2946 new_dir, new_name),
2947 &exception);
2948 } while (exception.retry);
2949 return err;
2950}
2951
2952static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2953{
2954 struct nfs_server *server = NFS_SERVER(inode);
2955 struct nfs4_link_arg arg = {
2956 .fh = NFS_FH(inode),
2957 .dir_fh = NFS_FH(dir),
2958 .name = name,
2959 .bitmask = server->attr_bitmask,
2960 };
2961 struct nfs4_link_res res = {
2962 .server = server,
2963 };
2964 struct rpc_message msg = {
2965 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2966 .rpc_argp = &arg,
2967 .rpc_resp = &res,
2968 };
2969 int status = -ENOMEM;
2970
2971 res.fattr = nfs_alloc_fattr();
2972 res.dir_attr = nfs_alloc_fattr();
2973 if (res.fattr == NULL || res.dir_attr == NULL)
2974 goto out;
2975
2976 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2977 if (!status) {
2978 update_changeattr(dir, &res.cinfo);
2979 nfs_post_op_update_inode(dir, res.dir_attr);
2980 nfs_post_op_update_inode(inode, res.fattr);
2981 }
2982out:
2983 nfs_free_fattr(res.dir_attr);
2984 nfs_free_fattr(res.fattr);
2985 return status;
2986}
2987
2988static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2989{
2990 struct nfs4_exception exception = { };
2991 int err;
2992 do {
2993 err = nfs4_handle_exception(NFS_SERVER(inode),
2994 _nfs4_proc_link(inode, dir, name),
2995 &exception);
2996 } while (exception.retry);
2997 return err;
2998}
2999
3000struct nfs4_createdata {
3001 struct rpc_message msg;
3002 struct nfs4_create_arg arg;
3003 struct nfs4_create_res res;
3004 struct nfs_fh fh;
3005 struct nfs_fattr fattr;
3006 struct nfs_fattr dir_fattr;
3007};
3008
3009static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3010 struct qstr *name, struct iattr *sattr, u32 ftype)
3011{
3012 struct nfs4_createdata *data;
3013
3014 data = kzalloc(sizeof(*data), GFP_KERNEL);
3015 if (data != NULL) {
3016 struct nfs_server *server = NFS_SERVER(dir);
3017
3018 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3019 data->msg.rpc_argp = &data->arg;
3020 data->msg.rpc_resp = &data->res;
3021 data->arg.dir_fh = NFS_FH(dir);
3022 data->arg.server = server;
3023 data->arg.name = name;
3024 data->arg.attrs = sattr;
3025 data->arg.ftype = ftype;
3026 data->arg.bitmask = server->attr_bitmask;
3027 data->res.server = server;
3028 data->res.fh = &data->fh;
3029 data->res.fattr = &data->fattr;
3030 data->res.dir_fattr = &data->dir_fattr;
3031 nfs_fattr_init(data->res.fattr);
3032 nfs_fattr_init(data->res.dir_fattr);
3033 }
3034 return data;
3035}
3036
3037static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3038{
3039 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3040 &data->arg.seq_args, &data->res.seq_res, 1);
3041 if (status == 0) {
3042 update_changeattr(dir, &data->res.dir_cinfo);
3043 nfs_post_op_update_inode(dir, data->res.dir_fattr);
3044 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3045 }
3046 return status;
3047}
3048
3049static void nfs4_free_createdata(struct nfs4_createdata *data)
3050{
3051 kfree(data);
3052}
3053
3054static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3055 struct page *page, unsigned int len, struct iattr *sattr)
3056{
3057 struct nfs4_createdata *data;
3058 int status = -ENAMETOOLONG;
3059
3060 if (len > NFS4_MAXPATHLEN)
3061 goto out;
3062
3063 status = -ENOMEM;
3064 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3065 if (data == NULL)
3066 goto out;
3067
3068 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3069 data->arg.u.symlink.pages = &page;
3070 data->arg.u.symlink.len = len;
3071
3072 status = nfs4_do_create(dir, dentry, data);
3073
3074 nfs4_free_createdata(data);
3075out:
3076 return status;
3077}
3078
3079static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3080 struct page *page, unsigned int len, struct iattr *sattr)
3081{
3082 struct nfs4_exception exception = { };
3083 int err;
3084 do {
3085 err = nfs4_handle_exception(NFS_SERVER(dir),
3086 _nfs4_proc_symlink(dir, dentry, page,
3087 len, sattr),
3088 &exception);
3089 } while (exception.retry);
3090 return err;
3091}
3092
3093static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3094 struct iattr *sattr)
3095{
3096 struct nfs4_createdata *data;
3097 int status = -ENOMEM;
3098
3099 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3100 if (data == NULL)
3101 goto out;
3102
3103 status = nfs4_do_create(dir, dentry, data);
3104
3105 nfs4_free_createdata(data);
3106out:
3107 return status;
3108}
3109
3110static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3111 struct iattr *sattr)
3112{
3113 struct nfs4_exception exception = { };
3114 int err;
3115
3116 sattr->ia_mode &= ~current_umask();
3117 do {
3118 err = nfs4_handle_exception(NFS_SERVER(dir),
3119 _nfs4_proc_mkdir(dir, dentry, sattr),
3120 &exception);
3121 } while (exception.retry);
3122 return err;
3123}
3124
3125static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3126 u64 cookie, struct page **pages, unsigned int count, int plus)
3127{
3128 struct inode *dir = dentry->d_inode;
3129 struct nfs4_readdir_arg args = {
3130 .fh = NFS_FH(dir),
3131 .pages = pages,
3132 .pgbase = 0,
3133 .count = count,
3134 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3135 .plus = plus,
3136 };
3137 struct nfs4_readdir_res res;
3138 struct rpc_message msg = {
3139 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3140 .rpc_argp = &args,
3141 .rpc_resp = &res,
3142 .rpc_cred = cred,
3143 };
3144 int status;
3145
3146 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3147 dentry->d_parent->d_name.name,
3148 dentry->d_name.name,
3149 (unsigned long long)cookie);
3150 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3151 res.pgbase = args.pgbase;
3152 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3153 if (status >= 0) {
3154 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3155 status += args.pgbase;
3156 }
3157
3158 nfs_invalidate_atime(dir);
3159
3160 dprintk("%s: returns %d\n", __func__, status);
3161 return status;
3162}
3163
3164static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3165 u64 cookie, struct page **pages, unsigned int count, int plus)
3166{
3167 struct nfs4_exception exception = { };
3168 int err;
3169 do {
3170 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3171 _nfs4_proc_readdir(dentry, cred, cookie,
3172 pages, count, plus),
3173 &exception);
3174 } while (exception.retry);
3175 return err;
3176}
3177
3178static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3179 struct iattr *sattr, dev_t rdev)
3180{
3181 struct nfs4_createdata *data;
3182 int mode = sattr->ia_mode;
3183 int status = -ENOMEM;
3184
3185 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3186 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3187
3188 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3189 if (data == NULL)
3190 goto out;
3191
3192 if (S_ISFIFO(mode))
3193 data->arg.ftype = NF4FIFO;
3194 else if (S_ISBLK(mode)) {
3195 data->arg.ftype = NF4BLK;
3196 data->arg.u.device.specdata1 = MAJOR(rdev);
3197 data->arg.u.device.specdata2 = MINOR(rdev);
3198 }
3199 else if (S_ISCHR(mode)) {
3200 data->arg.ftype = NF4CHR;
3201 data->arg.u.device.specdata1 = MAJOR(rdev);
3202 data->arg.u.device.specdata2 = MINOR(rdev);
3203 }
3204
3205 status = nfs4_do_create(dir, dentry, data);
3206
3207 nfs4_free_createdata(data);
3208out:
3209 return status;
3210}
3211
3212static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3213 struct iattr *sattr, dev_t rdev)
3214{
3215 struct nfs4_exception exception = { };
3216 int err;
3217
3218 sattr->ia_mode &= ~current_umask();
3219 do {
3220 err = nfs4_handle_exception(NFS_SERVER(dir),
3221 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3222 &exception);
3223 } while (exception.retry);
3224 return err;
3225}
3226
3227static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3228 struct nfs_fsstat *fsstat)
3229{
3230 struct nfs4_statfs_arg args = {
3231 .fh = fhandle,
3232 .bitmask = server->attr_bitmask,
3233 };
3234 struct nfs4_statfs_res res = {
3235 .fsstat = fsstat,
3236 };
3237 struct rpc_message msg = {
3238 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3239 .rpc_argp = &args,
3240 .rpc_resp = &res,
3241 };
3242
3243 nfs_fattr_init(fsstat->fattr);
3244 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3245}
3246
3247static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3248{
3249 struct nfs4_exception exception = { };
3250 int err;
3251 do {
3252 err = nfs4_handle_exception(server,
3253 _nfs4_proc_statfs(server, fhandle, fsstat),
3254 &exception);
3255 } while (exception.retry);
3256 return err;
3257}
3258
3259static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3260 struct nfs_fsinfo *fsinfo)
3261{
3262 struct nfs4_fsinfo_arg args = {
3263 .fh = fhandle,
3264 .bitmask = server->attr_bitmask,
3265 };
3266 struct nfs4_fsinfo_res res = {
3267 .fsinfo = fsinfo,
3268 };
3269 struct rpc_message msg = {
3270 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3271 .rpc_argp = &args,
3272 .rpc_resp = &res,
3273 };
3274
3275 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3276}
3277
3278static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3279{
3280 struct nfs4_exception exception = { };
3281 int err;
3282
3283 do {
3284 err = nfs4_handle_exception(server,
3285 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3286 &exception);
3287 } while (exception.retry);
3288 return err;
3289}
3290
3291static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3292{
3293 nfs_fattr_init(fsinfo->fattr);
3294 return nfs4_do_fsinfo(server, fhandle, fsinfo);
3295}
3296
3297static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3298 struct nfs_pathconf *pathconf)
3299{
3300 struct nfs4_pathconf_arg args = {
3301 .fh = fhandle,
3302 .bitmask = server->attr_bitmask,
3303 };
3304 struct nfs4_pathconf_res res = {
3305 .pathconf = pathconf,
3306 };
3307 struct rpc_message msg = {
3308 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3309 .rpc_argp = &args,
3310 .rpc_resp = &res,
3311 };
3312
3313 /* None of the pathconf attributes are mandatory to implement */
3314 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3315 memset(pathconf, 0, sizeof(*pathconf));
3316 return 0;
3317 }
3318
3319 nfs_fattr_init(pathconf->fattr);
3320 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3321}
3322
3323static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3324 struct nfs_pathconf *pathconf)
3325{
3326 struct nfs4_exception exception = { };
3327 int err;
3328
3329 do {
3330 err = nfs4_handle_exception(server,
3331 _nfs4_proc_pathconf(server, fhandle, pathconf),
3332 &exception);
3333 } while (exception.retry);
3334 return err;
3335}
3336
3337void __nfs4_read_done_cb(struct nfs_read_data *data)
3338{
3339 nfs_invalidate_atime(data->inode);
3340}
3341
3342static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3343{
3344 struct nfs_server *server = NFS_SERVER(data->inode);
3345
3346 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3347 rpc_restart_call_prepare(task);
3348 return -EAGAIN;
3349 }
3350
3351 __nfs4_read_done_cb(data);
3352 if (task->tk_status > 0)
3353 renew_lease(server, data->timestamp);
3354 return 0;
3355}
3356
3357static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3358{
3359
3360 dprintk("--> %s\n", __func__);
3361
3362 if (!nfs4_sequence_done(task, &data->res.seq_res))
3363 return -EAGAIN;
3364
3365 return data->read_done_cb ? data->read_done_cb(task, data) :
3366 nfs4_read_done_cb(task, data);
3367}
3368
3369static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3370{
3371 data->timestamp = jiffies;
3372 data->read_done_cb = nfs4_read_done_cb;
3373 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3374 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3375}
3376
3377static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3378{
3379 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3380 &data->args.seq_args,
3381 &data->res.seq_res,
3382 task))
3383 return;
3384 rpc_call_start(task);
3385}
3386
3387/* Reset the the nfs_read_data to send the read to the MDS. */
3388void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3389{
3390 dprintk("%s Reset task for i/o through\n", __func__);
3391 put_lseg(data->lseg);
3392 data->lseg = NULL;
3393 /* offsets will differ in the dense stripe case */
3394 data->args.offset = data->mds_offset;
3395 data->ds_clp = NULL;
3396 data->args.fh = NFS_FH(data->inode);
3397 data->read_done_cb = nfs4_read_done_cb;
3398 task->tk_ops = data->mds_ops;
3399 rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3400}
3401EXPORT_SYMBOL_GPL(nfs4_reset_read);
3402
3403static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3404{
3405 struct inode *inode = data->inode;
3406
3407 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3408 rpc_restart_call_prepare(task);
3409 return -EAGAIN;
3410 }
3411 if (task->tk_status >= 0) {
3412 renew_lease(NFS_SERVER(inode), data->timestamp);
3413 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3414 }
3415 return 0;
3416}
3417
3418static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3419{
3420 if (!nfs4_sequence_done(task, &data->res.seq_res))
3421 return -EAGAIN;
3422 return data->write_done_cb ? data->write_done_cb(task, data) :
3423 nfs4_write_done_cb(task, data);
3424}
3425
3426/* Reset the the nfs_write_data to send the write to the MDS. */
3427void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3428{
3429 dprintk("%s Reset task for i/o through\n", __func__);
3430 put_lseg(data->lseg);
3431 data->lseg = NULL;
3432 data->ds_clp = NULL;
3433 data->write_done_cb = nfs4_write_done_cb;
3434 data->args.fh = NFS_FH(data->inode);
3435 data->args.bitmask = data->res.server->cache_consistency_bitmask;
3436 data->args.offset = data->mds_offset;
3437 data->res.fattr = &data->fattr;
3438 task->tk_ops = data->mds_ops;
3439 rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3440}
3441EXPORT_SYMBOL_GPL(nfs4_reset_write);
3442
3443static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3444{
3445 struct nfs_server *server = NFS_SERVER(data->inode);
3446
3447 if (data->lseg) {
3448 data->args.bitmask = NULL;
3449 data->res.fattr = NULL;
3450 } else
3451 data->args.bitmask = server->cache_consistency_bitmask;
3452 if (!data->write_done_cb)
3453 data->write_done_cb = nfs4_write_done_cb;
3454 data->res.server = server;
3455 data->timestamp = jiffies;
3456
3457 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3458 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3459}
3460
3461static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3462{
3463 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3464 &data->args.seq_args,
3465 &data->res.seq_res,
3466 task))
3467 return;
3468 rpc_call_start(task);
3469}
3470
3471static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3472{
3473 struct inode *inode = data->inode;
3474
3475 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3476 rpc_restart_call_prepare(task);
3477 return -EAGAIN;
3478 }
3479 nfs_refresh_inode(inode, data->res.fattr);
3480 return 0;
3481}
3482
3483static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3484{
3485 if (!nfs4_sequence_done(task, &data->res.seq_res))
3486 return -EAGAIN;
3487 return data->write_done_cb(task, data);
3488}
3489
3490static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3491{
3492 struct nfs_server *server = NFS_SERVER(data->inode);
3493
3494 if (data->lseg) {
3495 data->args.bitmask = NULL;
3496 data->res.fattr = NULL;
3497 } else
3498 data->args.bitmask = server->cache_consistency_bitmask;
3499 if (!data->write_done_cb)
3500 data->write_done_cb = nfs4_commit_done_cb;
3501 data->res.server = server;
3502 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3503 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3504}
3505
3506struct nfs4_renewdata {
3507 struct nfs_client *client;
3508 unsigned long timestamp;
3509};
3510
3511/*
3512 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3513 * standalone procedure for queueing an asynchronous RENEW.
3514 */
3515static void nfs4_renew_release(void *calldata)
3516{
3517 struct nfs4_renewdata *data = calldata;
3518 struct nfs_client *clp = data->client;
3519
3520 if (atomic_read(&clp->cl_count) > 1)
3521 nfs4_schedule_state_renewal(clp);
3522 nfs_put_client(clp);
3523 kfree(data);
3524}
3525
3526static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3527{
3528 struct nfs4_renewdata *data = calldata;
3529 struct nfs_client *clp = data->client;
3530 unsigned long timestamp = data->timestamp;
3531
3532 if (task->tk_status < 0) {
3533 /* Unless we're shutting down, schedule state recovery! */
3534 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3535 return;
3536 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3537 nfs4_schedule_lease_recovery(clp);
3538 return;
3539 }
3540 nfs4_schedule_path_down_recovery(clp);
3541 }
3542 do_renew_lease(clp, timestamp);
3543}
3544
3545static const struct rpc_call_ops nfs4_renew_ops = {
3546 .rpc_call_done = nfs4_renew_done,
3547 .rpc_release = nfs4_renew_release,
3548};
3549
3550static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3551{
3552 struct rpc_message msg = {
3553 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3554 .rpc_argp = clp,
3555 .rpc_cred = cred,
3556 };
3557 struct nfs4_renewdata *data;
3558
3559 if (renew_flags == 0)
3560 return 0;
3561 if (!atomic_inc_not_zero(&clp->cl_count))
3562 return -EIO;
3563 data = kmalloc(sizeof(*data), GFP_NOFS);
3564 if (data == NULL)
3565 return -ENOMEM;
3566 data->client = clp;
3567 data->timestamp = jiffies;
3568 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3569 &nfs4_renew_ops, data);
3570}
3571
3572static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3573{
3574 struct rpc_message msg = {
3575 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3576 .rpc_argp = clp,
3577 .rpc_cred = cred,
3578 };
3579 unsigned long now = jiffies;
3580 int status;
3581
3582 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3583 if (status < 0)
3584 return status;
3585 do_renew_lease(clp, now);
3586 return 0;
3587}
3588
3589static inline int nfs4_server_supports_acls(struct nfs_server *server)
3590{
3591 return (server->caps & NFS_CAP_ACLS)
3592 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3593 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3594}
3595
3596/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3597 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3598 * the stack.
3599 */
3600#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3601
3602static int buf_to_pages_noslab(const void *buf, size_t buflen,
3603 struct page **pages, unsigned int *pgbase)
3604{
3605 struct page *newpage, **spages;
3606 int rc = 0;
3607 size_t len;
3608 spages = pages;
3609
3610 do {
3611 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3612 newpage = alloc_page(GFP_KERNEL);
3613
3614 if (newpage == NULL)
3615 goto unwind;
3616 memcpy(page_address(newpage), buf, len);
3617 buf += len;
3618 buflen -= len;
3619 *pages++ = newpage;
3620 rc++;
3621 } while (buflen != 0);
3622
3623 return rc;
3624
3625unwind:
3626 for(; rc > 0; rc--)
3627 __free_page(spages[rc-1]);
3628 return -ENOMEM;
3629}
3630
3631struct nfs4_cached_acl {
3632 int cached;
3633 size_t len;
3634 char data[0];
3635};
3636
3637static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3638{
3639 struct nfs_inode *nfsi = NFS_I(inode);
3640
3641 spin_lock(&inode->i_lock);
3642 kfree(nfsi->nfs4_acl);
3643 nfsi->nfs4_acl = acl;
3644 spin_unlock(&inode->i_lock);
3645}
3646
3647static void nfs4_zap_acl_attr(struct inode *inode)
3648{
3649 nfs4_set_cached_acl(inode, NULL);
3650}
3651
3652static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3653{
3654 struct nfs_inode *nfsi = NFS_I(inode);
3655 struct nfs4_cached_acl *acl;
3656 int ret = -ENOENT;
3657
3658 spin_lock(&inode->i_lock);
3659 acl = nfsi->nfs4_acl;
3660 if (acl == NULL)
3661 goto out;
3662 if (buf == NULL) /* user is just asking for length */
3663 goto out_len;
3664 if (acl->cached == 0)
3665 goto out;
3666 ret = -ERANGE; /* see getxattr(2) man page */
3667 if (acl->len > buflen)
3668 goto out;
3669 memcpy(buf, acl->data, acl->len);
3670out_len:
3671 ret = acl->len;
3672out:
3673 spin_unlock(&inode->i_lock);
3674 return ret;
3675}
3676
3677static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3678{
3679 struct nfs4_cached_acl *acl;
3680
3681 if (pages && acl_len <= PAGE_SIZE) {
3682 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3683 if (acl == NULL)
3684 goto out;
3685 acl->cached = 1;
3686 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3687 } else {
3688 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3689 if (acl == NULL)
3690 goto out;
3691 acl->cached = 0;
3692 }
3693 acl->len = acl_len;
3694out:
3695 nfs4_set_cached_acl(inode, acl);
3696}
3697
3698/*
3699 * The getxattr API returns the required buffer length when called with a
3700 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3701 * the required buf. On a NULL buf, we send a page of data to the server
3702 * guessing that the ACL request can be serviced by a page. If so, we cache
3703 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3704 * the cache. If not so, we throw away the page, and cache the required
3705 * length. The next getxattr call will then produce another round trip to
3706 * the server, this time with the input buf of the required size.
3707 */
3708static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3709{
3710 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3711 struct nfs_getaclargs args = {
3712 .fh = NFS_FH(inode),
3713 .acl_pages = pages,
3714 .acl_len = buflen,
3715 };
3716 struct nfs_getaclres res = {
3717 .acl_len = buflen,
3718 };
3719 struct rpc_message msg = {
3720 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3721 .rpc_argp = &args,
3722 .rpc_resp = &res,
3723 };
3724 int ret = -ENOMEM, npages, i, acl_len = 0;
3725
3726 npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3727 /* As long as we're doing a round trip to the server anyway,
3728 * let's be prepared for a page of acl data. */
3729 if (npages == 0)
3730 npages = 1;
3731
3732 /* Add an extra page to handle the bitmap returned */
3733 npages++;
3734
3735 for (i = 0; i < npages; i++) {
3736 pages[i] = alloc_page(GFP_KERNEL);
3737 if (!pages[i])
3738 goto out_free;
3739 }
3740
3741 /* for decoding across pages */
3742 res.acl_scratch = alloc_page(GFP_KERNEL);
3743 if (!res.acl_scratch)
3744 goto out_free;
3745
3746 args.acl_len = npages * PAGE_SIZE;
3747 args.acl_pgbase = 0;
3748
3749 /* Let decode_getfacl know not to fail if the ACL data is larger than
3750 * the page we send as a guess */
3751 if (buf == NULL)
3752 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3753
3754 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
3755 __func__, buf, buflen, npages, args.acl_len);
3756 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3757 &msg, &args.seq_args, &res.seq_res, 0);
3758 if (ret)
3759 goto out_free;
3760
3761 acl_len = res.acl_len - res.acl_data_offset;
3762 if (acl_len > args.acl_len)
3763 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3764 else
3765 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3766 acl_len);
3767 if (buf) {
3768 ret = -ERANGE;
3769 if (acl_len > buflen)
3770 goto out_free;
3771 _copy_from_pages(buf, pages, res.acl_data_offset,
3772 acl_len);
3773 }
3774 ret = acl_len;
3775out_free:
3776 for (i = 0; i < npages; i++)
3777 if (pages[i])
3778 __free_page(pages[i]);
3779 if (res.acl_scratch)
3780 __free_page(res.acl_scratch);
3781 return ret;
3782}
3783
3784static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3785{
3786 struct nfs4_exception exception = { };
3787 ssize_t ret;
3788 do {
3789 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3790 if (ret >= 0)
3791 break;
3792 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3793 } while (exception.retry);
3794 return ret;
3795}
3796
3797static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3798{
3799 struct nfs_server *server = NFS_SERVER(inode);
3800 int ret;
3801
3802 if (!nfs4_server_supports_acls(server))
3803 return -EOPNOTSUPP;
3804 ret = nfs_revalidate_inode(server, inode);
3805 if (ret < 0)
3806 return ret;
3807 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3808 nfs_zap_acl_cache(inode);
3809 ret = nfs4_read_cached_acl(inode, buf, buflen);
3810 if (ret != -ENOENT)
3811 /* -ENOENT is returned if there is no ACL or if there is an ACL
3812 * but no cached acl data, just the acl length */
3813 return ret;
3814 return nfs4_get_acl_uncached(inode, buf, buflen);
3815}
3816
3817static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3818{
3819 struct nfs_server *server = NFS_SERVER(inode);
3820 struct page *pages[NFS4ACL_MAXPAGES];
3821 struct nfs_setaclargs arg = {
3822 .fh = NFS_FH(inode),
3823 .acl_pages = pages,
3824 .acl_len = buflen,
3825 };
3826 struct nfs_setaclres res;
3827 struct rpc_message msg = {
3828 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3829 .rpc_argp = &arg,
3830 .rpc_resp = &res,
3831 };
3832 int ret, i;
3833
3834 if (!nfs4_server_supports_acls(server))
3835 return -EOPNOTSUPP;
3836 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3837 if (i < 0)
3838 return i;
3839 nfs_inode_return_delegation(inode);
3840 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3841
3842 /*
3843 * Free each page after tx, so the only ref left is
3844 * held by the network stack
3845 */
3846 for (; i > 0; i--)
3847 put_page(pages[i-1]);
3848
3849 /*
3850 * Acl update can result in inode attribute update.
3851 * so mark the attribute cache invalid.
3852 */
3853 spin_lock(&inode->i_lock);
3854 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3855 spin_unlock(&inode->i_lock);
3856 nfs_access_zap_cache(inode);
3857 nfs_zap_acl_cache(inode);
3858 return ret;
3859}
3860
3861static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3862{
3863 struct nfs4_exception exception = { };
3864 int err;
3865 do {
3866 err = nfs4_handle_exception(NFS_SERVER(inode),
3867 __nfs4_proc_set_acl(inode, buf, buflen),
3868 &exception);
3869 } while (exception.retry);
3870 return err;
3871}
3872
3873static int
3874nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3875{
3876 struct nfs_client *clp = server->nfs_client;
3877
3878 if (task->tk_status >= 0)
3879 return 0;
3880 switch(task->tk_status) {
3881 case -NFS4ERR_DELEG_REVOKED:
3882 case -NFS4ERR_ADMIN_REVOKED:
3883 case -NFS4ERR_BAD_STATEID:
3884 if (state == NULL)
3885 break;
3886 nfs_remove_bad_delegation(state->inode);
3887 case -NFS4ERR_OPENMODE:
3888 if (state == NULL)
3889 break;
3890 nfs4_schedule_stateid_recovery(server, state);
3891 goto wait_on_recovery;
3892 case -NFS4ERR_EXPIRED:
3893 if (state != NULL)
3894 nfs4_schedule_stateid_recovery(server, state);
3895 case -NFS4ERR_STALE_STATEID:
3896 case -NFS4ERR_STALE_CLIENTID:
3897 nfs4_schedule_lease_recovery(clp);
3898 goto wait_on_recovery;
3899#if defined(CONFIG_NFS_V4_1)
3900 case -NFS4ERR_BADSESSION:
3901 case -NFS4ERR_BADSLOT:
3902 case -NFS4ERR_BAD_HIGH_SLOT:
3903 case -NFS4ERR_DEADSESSION:
3904 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3905 case -NFS4ERR_SEQ_FALSE_RETRY:
3906 case -NFS4ERR_SEQ_MISORDERED:
3907 dprintk("%s ERROR %d, Reset session\n", __func__,
3908 task->tk_status);
3909 nfs4_schedule_session_recovery(clp->cl_session);
3910 task->tk_status = 0;
3911 return -EAGAIN;
3912#endif /* CONFIG_NFS_V4_1 */
3913 case -NFS4ERR_DELAY:
3914 nfs_inc_server_stats(server, NFSIOS_DELAY);
3915 case -NFS4ERR_GRACE:
3916 case -EKEYEXPIRED:
3917 rpc_delay(task, NFS4_POLL_RETRY_MAX);
3918 task->tk_status = 0;
3919 return -EAGAIN;
3920 case -NFS4ERR_RETRY_UNCACHED_REP:
3921 case -NFS4ERR_OLD_STATEID:
3922 task->tk_status = 0;
3923 return -EAGAIN;
3924 }
3925 task->tk_status = nfs4_map_errors(task->tk_status);
3926 return 0;
3927wait_on_recovery:
3928 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3929 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3930 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3931 task->tk_status = 0;
3932 return -EAGAIN;
3933}
3934
3935static void nfs4_construct_boot_verifier(struct nfs_client *clp,
3936 nfs4_verifier *bootverf)
3937{
3938 __be32 verf[2];
3939
3940 verf[0] = htonl((u32)clp->cl_boot_time.tv_sec);
3941 verf[1] = htonl((u32)clp->cl_boot_time.tv_nsec);
3942 memcpy(bootverf->data, verf, sizeof(bootverf->data));
3943}
3944
3945int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3946 unsigned short port, struct rpc_cred *cred,
3947 struct nfs4_setclientid_res *res)
3948{
3949 nfs4_verifier sc_verifier;
3950 struct nfs4_setclientid setclientid = {
3951 .sc_verifier = &sc_verifier,
3952 .sc_prog = program,
3953 .sc_cb_ident = clp->cl_cb_ident,
3954 };
3955 struct rpc_message msg = {
3956 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3957 .rpc_argp = &setclientid,
3958 .rpc_resp = res,
3959 .rpc_cred = cred,
3960 };
3961 int loop = 0;
3962 int status;
3963
3964 nfs4_construct_boot_verifier(clp, &sc_verifier);
3965
3966 for(;;) {
3967 rcu_read_lock();
3968 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3969 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3970 clp->cl_ipaddr,
3971 rpc_peeraddr2str(clp->cl_rpcclient,
3972 RPC_DISPLAY_ADDR),
3973 rpc_peeraddr2str(clp->cl_rpcclient,
3974 RPC_DISPLAY_PROTO),
3975 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3976 clp->cl_id_uniquifier);
3977 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3978 sizeof(setclientid.sc_netid),
3979 rpc_peeraddr2str(clp->cl_rpcclient,
3980 RPC_DISPLAY_NETID));
3981 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3982 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3983 clp->cl_ipaddr, port >> 8, port & 255);
3984 rcu_read_unlock();
3985
3986 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3987 if (status != -NFS4ERR_CLID_INUSE)
3988 break;
3989 if (loop != 0) {
3990 ++clp->cl_id_uniquifier;
3991 break;
3992 }
3993 ++loop;
3994 ssleep(clp->cl_lease_time / HZ + 1);
3995 }
3996 return status;
3997}
3998
3999int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4000 struct nfs4_setclientid_res *arg,
4001 struct rpc_cred *cred)
4002{
4003 struct nfs_fsinfo fsinfo;
4004 struct rpc_message msg = {
4005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4006 .rpc_argp = arg,
4007 .rpc_resp = &fsinfo,
4008 .rpc_cred = cred,
4009 };
4010 unsigned long now;
4011 int status;
4012
4013 now = jiffies;
4014 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4015 if (status == 0) {
4016 spin_lock(&clp->cl_lock);
4017 clp->cl_lease_time = fsinfo.lease_time * HZ;
4018 clp->cl_last_renewal = now;
4019 spin_unlock(&clp->cl_lock);
4020 }
4021 return status;
4022}
4023
4024struct nfs4_delegreturndata {
4025 struct nfs4_delegreturnargs args;
4026 struct nfs4_delegreturnres res;
4027 struct nfs_fh fh;
4028 nfs4_stateid stateid;
4029 unsigned long timestamp;
4030 struct nfs_fattr fattr;
4031 int rpc_status;
4032};
4033
4034static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4035{
4036 struct nfs4_delegreturndata *data = calldata;
4037
4038 if (!nfs4_sequence_done(task, &data->res.seq_res))
4039 return;
4040
4041 switch (task->tk_status) {
4042 case -NFS4ERR_STALE_STATEID:
4043 case -NFS4ERR_EXPIRED:
4044 case 0:
4045 renew_lease(data->res.server, data->timestamp);
4046 break;
4047 default:
4048 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4049 -EAGAIN) {
4050 rpc_restart_call_prepare(task);
4051 return;
4052 }
4053 }
4054 data->rpc_status = task->tk_status;
4055}
4056
4057static void nfs4_delegreturn_release(void *calldata)
4058{
4059 kfree(calldata);
4060}
4061
4062#if defined(CONFIG_NFS_V4_1)
4063static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4064{
4065 struct nfs4_delegreturndata *d_data;
4066
4067 d_data = (struct nfs4_delegreturndata *)data;
4068
4069 if (nfs4_setup_sequence(d_data->res.server,
4070 &d_data->args.seq_args,
4071 &d_data->res.seq_res, task))
4072 return;
4073 rpc_call_start(task);
4074}
4075#endif /* CONFIG_NFS_V4_1 */
4076
4077static const struct rpc_call_ops nfs4_delegreturn_ops = {
4078#if defined(CONFIG_NFS_V4_1)
4079 .rpc_call_prepare = nfs4_delegreturn_prepare,
4080#endif /* CONFIG_NFS_V4_1 */
4081 .rpc_call_done = nfs4_delegreturn_done,
4082 .rpc_release = nfs4_delegreturn_release,
4083};
4084
4085static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4086{
4087 struct nfs4_delegreturndata *data;
4088 struct nfs_server *server = NFS_SERVER(inode);
4089 struct rpc_task *task;
4090 struct rpc_message msg = {
4091 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4092 .rpc_cred = cred,
4093 };
4094 struct rpc_task_setup task_setup_data = {
4095 .rpc_client = server->client,
4096 .rpc_message = &msg,
4097 .callback_ops = &nfs4_delegreturn_ops,
4098 .flags = RPC_TASK_ASYNC,
4099 };
4100 int status = 0;
4101
4102 data = kzalloc(sizeof(*data), GFP_NOFS);
4103 if (data == NULL)
4104 return -ENOMEM;
4105 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4106 data->args.fhandle = &data->fh;
4107 data->args.stateid = &data->stateid;
4108 data->args.bitmask = server->attr_bitmask;
4109 nfs_copy_fh(&data->fh, NFS_FH(inode));
4110 nfs4_stateid_copy(&data->stateid, stateid);
4111 data->res.fattr = &data->fattr;
4112 data->res.server = server;
4113 nfs_fattr_init(data->res.fattr);
4114 data->timestamp = jiffies;
4115 data->rpc_status = 0;
4116
4117 task_setup_data.callback_data = data;
4118 msg.rpc_argp = &data->args;
4119 msg.rpc_resp = &data->res;
4120 task = rpc_run_task(&task_setup_data);
4121 if (IS_ERR(task))
4122 return PTR_ERR(task);
4123 if (!issync)
4124 goto out;
4125 status = nfs4_wait_for_completion_rpc_task(task);
4126 if (status != 0)
4127 goto out;
4128 status = data->rpc_status;
4129 if (status != 0)
4130 goto out;
4131 nfs_refresh_inode(inode, &data->fattr);
4132out:
4133 rpc_put_task(task);
4134 return status;
4135}
4136
4137int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4138{
4139 struct nfs_server *server = NFS_SERVER(inode);
4140 struct nfs4_exception exception = { };
4141 int err;
4142 do {
4143 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4144 switch (err) {
4145 case -NFS4ERR_STALE_STATEID:
4146 case -NFS4ERR_EXPIRED:
4147 case 0:
4148 return 0;
4149 }
4150 err = nfs4_handle_exception(server, err, &exception);
4151 } while (exception.retry);
4152 return err;
4153}
4154
4155#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4156#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4157
4158/*
4159 * sleep, with exponential backoff, and retry the LOCK operation.
4160 */
4161static unsigned long
4162nfs4_set_lock_task_retry(unsigned long timeout)
4163{
4164 freezable_schedule_timeout_killable(timeout);
4165 timeout <<= 1;
4166 if (timeout > NFS4_LOCK_MAXTIMEOUT)
4167 return NFS4_LOCK_MAXTIMEOUT;
4168 return timeout;
4169}
4170
4171static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4172{
4173 struct inode *inode = state->inode;
4174 struct nfs_server *server = NFS_SERVER(inode);
4175 struct nfs_client *clp = server->nfs_client;
4176 struct nfs_lockt_args arg = {
4177 .fh = NFS_FH(inode),
4178 .fl = request,
4179 };
4180 struct nfs_lockt_res res = {
4181 .denied = request,
4182 };
4183 struct rpc_message msg = {
4184 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4185 .rpc_argp = &arg,
4186 .rpc_resp = &res,
4187 .rpc_cred = state->owner->so_cred,
4188 };
4189 struct nfs4_lock_state *lsp;
4190 int status;
4191
4192 arg.lock_owner.clientid = clp->cl_clientid;
4193 status = nfs4_set_lock_state(state, request);
4194 if (status != 0)
4195 goto out;
4196 lsp = request->fl_u.nfs4_fl.owner;
4197 arg.lock_owner.id = lsp->ls_seqid.owner_id;
4198 arg.lock_owner.s_dev = server->s_dev;
4199 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4200 switch (status) {
4201 case 0:
4202 request->fl_type = F_UNLCK;
4203 break;
4204 case -NFS4ERR_DENIED:
4205 status = 0;
4206 }
4207 request->fl_ops->fl_release_private(request);
4208out:
4209 return status;
4210}
4211
4212static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4213{
4214 struct nfs4_exception exception = { };
4215 int err;
4216
4217 do {
4218 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4219 _nfs4_proc_getlk(state, cmd, request),
4220 &exception);
4221 } while (exception.retry);
4222 return err;
4223}
4224
4225static int do_vfs_lock(struct file *file, struct file_lock *fl)
4226{
4227 int res = 0;
4228 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4229 case FL_POSIX:
4230 res = posix_lock_file_wait(file, fl);
4231 break;
4232 case FL_FLOCK:
4233 res = flock_lock_file_wait(file, fl);
4234 break;
4235 default:
4236 BUG();
4237 }
4238 return res;
4239}
4240
4241struct nfs4_unlockdata {
4242 struct nfs_locku_args arg;
4243 struct nfs_locku_res res;
4244 struct nfs4_lock_state *lsp;
4245 struct nfs_open_context *ctx;
4246 struct file_lock fl;
4247 const struct nfs_server *server;
4248 unsigned long timestamp;
4249};
4250
4251static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4252 struct nfs_open_context *ctx,
4253 struct nfs4_lock_state *lsp,
4254 struct nfs_seqid *seqid)
4255{
4256 struct nfs4_unlockdata *p;
4257 struct inode *inode = lsp->ls_state->inode;
4258
4259 p = kzalloc(sizeof(*p), GFP_NOFS);
4260 if (p == NULL)
4261 return NULL;
4262 p->arg.fh = NFS_FH(inode);
4263 p->arg.fl = &p->fl;
4264 p->arg.seqid = seqid;
4265 p->res.seqid = seqid;
4266 p->arg.stateid = &lsp->ls_stateid;
4267 p->lsp = lsp;
4268 atomic_inc(&lsp->ls_count);
4269 /* Ensure we don't close file until we're done freeing locks! */
4270 p->ctx = get_nfs_open_context(ctx);
4271 memcpy(&p->fl, fl, sizeof(p->fl));
4272 p->server = NFS_SERVER(inode);
4273 return p;
4274}
4275
4276static void nfs4_locku_release_calldata(void *data)
4277{
4278 struct nfs4_unlockdata *calldata = data;
4279 nfs_free_seqid(calldata->arg.seqid);
4280 nfs4_put_lock_state(calldata->lsp);
4281 put_nfs_open_context(calldata->ctx);
4282 kfree(calldata);
4283}
4284
4285static void nfs4_locku_done(struct rpc_task *task, void *data)
4286{
4287 struct nfs4_unlockdata *calldata = data;
4288
4289 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4290 return;
4291 switch (task->tk_status) {
4292 case 0:
4293 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4294 &calldata->res.stateid);
4295 renew_lease(calldata->server, calldata->timestamp);
4296 break;
4297 case -NFS4ERR_BAD_STATEID:
4298 case -NFS4ERR_OLD_STATEID:
4299 case -NFS4ERR_STALE_STATEID:
4300 case -NFS4ERR_EXPIRED:
4301 break;
4302 default:
4303 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4304 rpc_restart_call_prepare(task);
4305 }
4306}
4307
4308static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4309{
4310 struct nfs4_unlockdata *calldata = data;
4311
4312 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4313 return;
4314 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4315 /* Note: exit _without_ running nfs4_locku_done */
4316 task->tk_action = NULL;
4317 return;
4318 }
4319 calldata->timestamp = jiffies;
4320 if (nfs4_setup_sequence(calldata->server,
4321 &calldata->arg.seq_args,
4322 &calldata->res.seq_res, task))
4323 return;
4324 rpc_call_start(task);
4325}
4326
4327static const struct rpc_call_ops nfs4_locku_ops = {
4328 .rpc_call_prepare = nfs4_locku_prepare,
4329 .rpc_call_done = nfs4_locku_done,
4330 .rpc_release = nfs4_locku_release_calldata,
4331};
4332
4333static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4334 struct nfs_open_context *ctx,
4335 struct nfs4_lock_state *lsp,
4336 struct nfs_seqid *seqid)
4337{
4338 struct nfs4_unlockdata *data;
4339 struct rpc_message msg = {
4340 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4341 .rpc_cred = ctx->cred,
4342 };
4343 struct rpc_task_setup task_setup_data = {
4344 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4345 .rpc_message = &msg,
4346 .callback_ops = &nfs4_locku_ops,
4347 .workqueue = nfsiod_workqueue,
4348 .flags = RPC_TASK_ASYNC,
4349 };
4350
4351 /* Ensure this is an unlock - when canceling a lock, the
4352 * canceled lock is passed in, and it won't be an unlock.
4353 */
4354 fl->fl_type = F_UNLCK;
4355
4356 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4357 if (data == NULL) {
4358 nfs_free_seqid(seqid);
4359 return ERR_PTR(-ENOMEM);
4360 }
4361
4362 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4363 msg.rpc_argp = &data->arg;
4364 msg.rpc_resp = &data->res;
4365 task_setup_data.callback_data = data;
4366 return rpc_run_task(&task_setup_data);
4367}
4368
4369static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4370{
4371 struct nfs_inode *nfsi = NFS_I(state->inode);
4372 struct nfs_seqid *seqid;
4373 struct nfs4_lock_state *lsp;
4374 struct rpc_task *task;
4375 int status = 0;
4376 unsigned char fl_flags = request->fl_flags;
4377
4378 status = nfs4_set_lock_state(state, request);
4379 /* Unlock _before_ we do the RPC call */
4380 request->fl_flags |= FL_EXISTS;
4381 down_read(&nfsi->rwsem);
4382 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4383 up_read(&nfsi->rwsem);
4384 goto out;
4385 }
4386 up_read(&nfsi->rwsem);
4387 if (status != 0)
4388 goto out;
4389 /* Is this a delegated lock? */
4390 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4391 goto out;
4392 lsp = request->fl_u.nfs4_fl.owner;
4393 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4394 status = -ENOMEM;
4395 if (seqid == NULL)
4396 goto out;
4397 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4398 status = PTR_ERR(task);
4399 if (IS_ERR(task))
4400 goto out;
4401 status = nfs4_wait_for_completion_rpc_task(task);
4402 rpc_put_task(task);
4403out:
4404 request->fl_flags = fl_flags;
4405 return status;
4406}
4407
4408struct nfs4_lockdata {
4409 struct nfs_lock_args arg;
4410 struct nfs_lock_res res;
4411 struct nfs4_lock_state *lsp;
4412 struct nfs_open_context *ctx;
4413 struct file_lock fl;
4414 unsigned long timestamp;
4415 int rpc_status;
4416 int cancelled;
4417 struct nfs_server *server;
4418};
4419
4420static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4421 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4422 gfp_t gfp_mask)
4423{
4424 struct nfs4_lockdata *p;
4425 struct inode *inode = lsp->ls_state->inode;
4426 struct nfs_server *server = NFS_SERVER(inode);
4427
4428 p = kzalloc(sizeof(*p), gfp_mask);
4429 if (p == NULL)
4430 return NULL;
4431
4432 p->arg.fh = NFS_FH(inode);
4433 p->arg.fl = &p->fl;
4434 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4435 if (p->arg.open_seqid == NULL)
4436 goto out_free;
4437 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4438 if (p->arg.lock_seqid == NULL)
4439 goto out_free_seqid;
4440 p->arg.lock_stateid = &lsp->ls_stateid;
4441 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4442 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4443 p->arg.lock_owner.s_dev = server->s_dev;
4444 p->res.lock_seqid = p->arg.lock_seqid;
4445 p->lsp = lsp;
4446 p->server = server;
4447 atomic_inc(&lsp->ls_count);
4448 p->ctx = get_nfs_open_context(ctx);
4449 memcpy(&p->fl, fl, sizeof(p->fl));
4450 return p;
4451out_free_seqid:
4452 nfs_free_seqid(p->arg.open_seqid);
4453out_free:
4454 kfree(p);
4455 return NULL;
4456}
4457
4458static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4459{
4460 struct nfs4_lockdata *data = calldata;
4461 struct nfs4_state *state = data->lsp->ls_state;
4462
4463 dprintk("%s: begin!\n", __func__);
4464 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4465 return;
4466 /* Do we need to do an open_to_lock_owner? */
4467 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4468 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4469 return;
4470 data->arg.open_stateid = &state->stateid;
4471 data->arg.new_lock_owner = 1;
4472 data->res.open_seqid = data->arg.open_seqid;
4473 } else
4474 data->arg.new_lock_owner = 0;
4475 data->timestamp = jiffies;
4476 if (nfs4_setup_sequence(data->server,
4477 &data->arg.seq_args,
4478 &data->res.seq_res, task))
4479 return;
4480 rpc_call_start(task);
4481 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4482}
4483
4484static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4485{
4486 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4487 nfs4_lock_prepare(task, calldata);
4488}
4489
4490static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4491{
4492 struct nfs4_lockdata *data = calldata;
4493
4494 dprintk("%s: begin!\n", __func__);
4495
4496 if (!nfs4_sequence_done(task, &data->res.seq_res))
4497 return;
4498
4499 data->rpc_status = task->tk_status;
4500 if (data->arg.new_lock_owner != 0) {
4501 if (data->rpc_status == 0)
4502 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4503 else
4504 goto out;
4505 }
4506 if (data->rpc_status == 0) {
4507 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4508 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4509 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4510 }
4511out:
4512 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4513}
4514
4515static void nfs4_lock_release(void *calldata)
4516{
4517 struct nfs4_lockdata *data = calldata;
4518
4519 dprintk("%s: begin!\n", __func__);
4520 nfs_free_seqid(data->arg.open_seqid);
4521 if (data->cancelled != 0) {
4522 struct rpc_task *task;
4523 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4524 data->arg.lock_seqid);
4525 if (!IS_ERR(task))
4526 rpc_put_task_async(task);
4527 dprintk("%s: cancelling lock!\n", __func__);
4528 } else
4529 nfs_free_seqid(data->arg.lock_seqid);
4530 nfs4_put_lock_state(data->lsp);
4531 put_nfs_open_context(data->ctx);
4532 kfree(data);
4533 dprintk("%s: done!\n", __func__);
4534}
4535
4536static const struct rpc_call_ops nfs4_lock_ops = {
4537 .rpc_call_prepare = nfs4_lock_prepare,
4538 .rpc_call_done = nfs4_lock_done,
4539 .rpc_release = nfs4_lock_release,
4540};
4541
4542static const struct rpc_call_ops nfs4_recover_lock_ops = {
4543 .rpc_call_prepare = nfs4_recover_lock_prepare,
4544 .rpc_call_done = nfs4_lock_done,
4545 .rpc_release = nfs4_lock_release,
4546};
4547
4548static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4549{
4550 switch (error) {
4551 case -NFS4ERR_ADMIN_REVOKED:
4552 case -NFS4ERR_BAD_STATEID:
4553 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4554 if (new_lock_owner != 0 ||
4555 (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4556 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4557 break;
4558 case -NFS4ERR_STALE_STATEID:
4559 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4560 case -NFS4ERR_EXPIRED:
4561 nfs4_schedule_lease_recovery(server->nfs_client);
4562 };
4563}
4564
4565static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4566{
4567 struct nfs4_lockdata *data;
4568 struct rpc_task *task;
4569 struct rpc_message msg = {
4570 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4571 .rpc_cred = state->owner->so_cred,
4572 };
4573 struct rpc_task_setup task_setup_data = {
4574 .rpc_client = NFS_CLIENT(state->inode),
4575 .rpc_message = &msg,
4576 .callback_ops = &nfs4_lock_ops,
4577 .workqueue = nfsiod_workqueue,
4578 .flags = RPC_TASK_ASYNC,
4579 };
4580 int ret;
4581
4582 dprintk("%s: begin!\n", __func__);
4583 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4584 fl->fl_u.nfs4_fl.owner,
4585 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4586 if (data == NULL)
4587 return -ENOMEM;
4588 if (IS_SETLKW(cmd))
4589 data->arg.block = 1;
4590 if (recovery_type > NFS_LOCK_NEW) {
4591 if (recovery_type == NFS_LOCK_RECLAIM)
4592 data->arg.reclaim = NFS_LOCK_RECLAIM;
4593 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4594 }
4595 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4596 msg.rpc_argp = &data->arg;
4597 msg.rpc_resp = &data->res;
4598 task_setup_data.callback_data = data;
4599 task = rpc_run_task(&task_setup_data);
4600 if (IS_ERR(task))
4601 return PTR_ERR(task);
4602 ret = nfs4_wait_for_completion_rpc_task(task);
4603 if (ret == 0) {
4604 ret = data->rpc_status;
4605 if (ret)
4606 nfs4_handle_setlk_error(data->server, data->lsp,
4607 data->arg.new_lock_owner, ret);
4608 } else
4609 data->cancelled = 1;
4610 rpc_put_task(task);
4611 dprintk("%s: done, ret = %d!\n", __func__, ret);
4612 return ret;
4613}
4614
4615static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4616{
4617 struct nfs_server *server = NFS_SERVER(state->inode);
4618 struct nfs4_exception exception = {
4619 .inode = state->inode,
4620 };
4621 int err;
4622
4623 do {
4624 /* Cache the lock if possible... */
4625 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4626 return 0;
4627 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4628 if (err != -NFS4ERR_DELAY)
4629 break;
4630 nfs4_handle_exception(server, err, &exception);
4631 } while (exception.retry);
4632 return err;
4633}
4634
4635static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4636{
4637 struct nfs_server *server = NFS_SERVER(state->inode);
4638 struct nfs4_exception exception = {
4639 .inode = state->inode,
4640 };
4641 int err;
4642
4643 err = nfs4_set_lock_state(state, request);
4644 if (err != 0)
4645 return err;
4646 do {
4647 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4648 return 0;
4649 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4650 switch (err) {
4651 default:
4652 goto out;
4653 case -NFS4ERR_GRACE:
4654 case -NFS4ERR_DELAY:
4655 nfs4_handle_exception(server, err, &exception);
4656 err = 0;
4657 }
4658 } while (exception.retry);
4659out:
4660 return err;
4661}
4662
4663#if defined(CONFIG_NFS_V4_1)
4664static int nfs41_check_expired_locks(struct nfs4_state *state)
4665{
4666 int status, ret = NFS_OK;
4667 struct nfs4_lock_state *lsp;
4668 struct nfs_server *server = NFS_SERVER(state->inode);
4669
4670 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4671 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4672 status = nfs41_test_stateid(server, &lsp->ls_stateid);
4673 if (status != NFS_OK) {
4674 nfs41_free_stateid(server, &lsp->ls_stateid);
4675 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4676 ret = status;
4677 }
4678 }
4679 };
4680
4681 return ret;
4682}
4683
4684static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4685{
4686 int status = NFS_OK;
4687
4688 if (test_bit(LK_STATE_IN_USE, &state->flags))
4689 status = nfs41_check_expired_locks(state);
4690 if (status == NFS_OK)
4691 return status;
4692 return nfs4_lock_expired(state, request);
4693}
4694#endif
4695
4696static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4697{
4698 struct nfs_inode *nfsi = NFS_I(state->inode);
4699 unsigned char fl_flags = request->fl_flags;
4700 int status = -ENOLCK;
4701
4702 if ((fl_flags & FL_POSIX) &&
4703 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4704 goto out;
4705 /* Is this a delegated open? */
4706 status = nfs4_set_lock_state(state, request);
4707 if (status != 0)
4708 goto out;
4709 request->fl_flags |= FL_ACCESS;
4710 status = do_vfs_lock(request->fl_file, request);
4711 if (status < 0)
4712 goto out;
4713 down_read(&nfsi->rwsem);
4714 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4715 /* Yes: cache locks! */
4716 /* ...but avoid races with delegation recall... */
4717 request->fl_flags = fl_flags & ~FL_SLEEP;
4718 status = do_vfs_lock(request->fl_file, request);
4719 goto out_unlock;
4720 }
4721 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4722 if (status != 0)
4723 goto out_unlock;
4724 /* Note: we always want to sleep here! */
4725 request->fl_flags = fl_flags | FL_SLEEP;
4726 if (do_vfs_lock(request->fl_file, request) < 0)
4727 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4728 "manager!\n", __func__);
4729out_unlock:
4730 up_read(&nfsi->rwsem);
4731out:
4732 request->fl_flags = fl_flags;
4733 return status;
4734}
4735
4736static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4737{
4738 struct nfs4_exception exception = {
4739 .state = state,
4740 .inode = state->inode,
4741 };
4742 int err;
4743
4744 do {
4745 err = _nfs4_proc_setlk(state, cmd, request);
4746 if (err == -NFS4ERR_DENIED)
4747 err = -EAGAIN;
4748 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4749 err, &exception);
4750 } while (exception.retry);
4751 return err;
4752}
4753
4754static int
4755nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4756{
4757 struct nfs_open_context *ctx;
4758 struct nfs4_state *state;
4759 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4760 int status;
4761
4762 /* verify open state */
4763 ctx = nfs_file_open_context(filp);
4764 state = ctx->state;
4765
4766 if (request->fl_start < 0 || request->fl_end < 0)
4767 return -EINVAL;
4768
4769 if (IS_GETLK(cmd)) {
4770 if (state != NULL)
4771 return nfs4_proc_getlk(state, F_GETLK, request);
4772 return 0;
4773 }
4774
4775 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4776 return -EINVAL;
4777
4778 if (request->fl_type == F_UNLCK) {
4779 if (state != NULL)
4780 return nfs4_proc_unlck(state, cmd, request);
4781 return 0;
4782 }
4783
4784 if (state == NULL)
4785 return -ENOLCK;
4786 /*
4787 * Don't rely on the VFS having checked the file open mode,
4788 * since it won't do this for flock() locks.
4789 */
4790 switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4791 case F_RDLCK:
4792 if (!(filp->f_mode & FMODE_READ))
4793 return -EBADF;
4794 break;
4795 case F_WRLCK:
4796 if (!(filp->f_mode & FMODE_WRITE))
4797 return -EBADF;
4798 }
4799
4800 do {
4801 status = nfs4_proc_setlk(state, cmd, request);
4802 if ((status != -EAGAIN) || IS_SETLK(cmd))
4803 break;
4804 timeout = nfs4_set_lock_task_retry(timeout);
4805 status = -ERESTARTSYS;
4806 if (signalled())
4807 break;
4808 } while(status < 0);
4809 return status;
4810}
4811
4812int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4813{
4814 struct nfs_server *server = NFS_SERVER(state->inode);
4815 struct nfs4_exception exception = { };
4816 int err;
4817
4818 err = nfs4_set_lock_state(state, fl);
4819 if (err != 0)
4820 goto out;
4821 do {
4822 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4823 switch (err) {
4824 default:
4825 printk(KERN_ERR "NFS: %s: unhandled error "
4826 "%d.\n", __func__, err);
4827 case 0:
4828 case -ESTALE:
4829 goto out;
4830 case -NFS4ERR_EXPIRED:
4831 nfs4_schedule_stateid_recovery(server, state);
4832 case -NFS4ERR_STALE_CLIENTID:
4833 case -NFS4ERR_STALE_STATEID:
4834 nfs4_schedule_lease_recovery(server->nfs_client);
4835 goto out;
4836 case -NFS4ERR_BADSESSION:
4837 case -NFS4ERR_BADSLOT:
4838 case -NFS4ERR_BAD_HIGH_SLOT:
4839 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4840 case -NFS4ERR_DEADSESSION:
4841 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4842 goto out;
4843 case -ERESTARTSYS:
4844 /*
4845 * The show must go on: exit, but mark the
4846 * stateid as needing recovery.
4847 */
4848 case -NFS4ERR_DELEG_REVOKED:
4849 case -NFS4ERR_ADMIN_REVOKED:
4850 case -NFS4ERR_BAD_STATEID:
4851 case -NFS4ERR_OPENMODE:
4852 nfs4_schedule_stateid_recovery(server, state);
4853 err = 0;
4854 goto out;
4855 case -EKEYEXPIRED:
4856 /*
4857 * User RPCSEC_GSS context has expired.
4858 * We cannot recover this stateid now, so
4859 * skip it and allow recovery thread to
4860 * proceed.
4861 */
4862 err = 0;
4863 goto out;
4864 case -ENOMEM:
4865 case -NFS4ERR_DENIED:
4866 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4867 err = 0;
4868 goto out;
4869 case -NFS4ERR_DELAY:
4870 break;
4871 }
4872 err = nfs4_handle_exception(server, err, &exception);
4873 } while (exception.retry);
4874out:
4875 return err;
4876}
4877
4878struct nfs_release_lockowner_data {
4879 struct nfs4_lock_state *lsp;
4880 struct nfs_server *server;
4881 struct nfs_release_lockowner_args args;
4882};
4883
4884static void nfs4_release_lockowner_release(void *calldata)
4885{
4886 struct nfs_release_lockowner_data *data = calldata;
4887 nfs4_free_lock_state(data->server, data->lsp);
4888 kfree(calldata);
4889}
4890
4891static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4892 .rpc_release = nfs4_release_lockowner_release,
4893};
4894
4895int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4896{
4897 struct nfs_server *server = lsp->ls_state->owner->so_server;
4898 struct nfs_release_lockowner_data *data;
4899 struct rpc_message msg = {
4900 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4901 };
4902
4903 if (server->nfs_client->cl_mvops->minor_version != 0)
4904 return -EINVAL;
4905 data = kmalloc(sizeof(*data), GFP_NOFS);
4906 if (!data)
4907 return -ENOMEM;
4908 data->lsp = lsp;
4909 data->server = server;
4910 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4911 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4912 data->args.lock_owner.s_dev = server->s_dev;
4913 msg.rpc_argp = &data->args;
4914 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4915 return 0;
4916}
4917
4918#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4919
4920static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4921 const void *buf, size_t buflen,
4922 int flags, int type)
4923{
4924 if (strcmp(key, "") != 0)
4925 return -EINVAL;
4926
4927 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4928}
4929
4930static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4931 void *buf, size_t buflen, int type)
4932{
4933 if (strcmp(key, "") != 0)
4934 return -EINVAL;
4935
4936 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4937}
4938
4939static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4940 size_t list_len, const char *name,
4941 size_t name_len, int type)
4942{
4943 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4944
4945 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4946 return 0;
4947
4948 if (list && len <= list_len)
4949 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4950 return len;
4951}
4952
4953/*
4954 * nfs_fhget will use either the mounted_on_fileid or the fileid
4955 */
4956static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4957{
4958 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4959 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4960 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4961 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4962 return;
4963
4964 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4965 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4966 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4967 fattr->nlink = 2;
4968}
4969
4970static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4971 const struct qstr *name,
4972 struct nfs4_fs_locations *fs_locations,
4973 struct page *page)
4974{
4975 struct nfs_server *server = NFS_SERVER(dir);
4976 u32 bitmask[2] = {
4977 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4978 };
4979 struct nfs4_fs_locations_arg args = {
4980 .dir_fh = NFS_FH(dir),
4981 .name = name,
4982 .page = page,
4983 .bitmask = bitmask,
4984 };
4985 struct nfs4_fs_locations_res res = {
4986 .fs_locations = fs_locations,
4987 };
4988 struct rpc_message msg = {
4989 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4990 .rpc_argp = &args,
4991 .rpc_resp = &res,
4992 };
4993 int status;
4994
4995 dprintk("%s: start\n", __func__);
4996
4997 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4998 * is not supported */
4999 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5000 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5001 else
5002 bitmask[0] |= FATTR4_WORD0_FILEID;
5003
5004 nfs_fattr_init(&fs_locations->fattr);
5005 fs_locations->server = server;
5006 fs_locations->nlocations = 0;
5007 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5008 dprintk("%s: returned status = %d\n", __func__, status);
5009 return status;
5010}
5011
5012int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5013 const struct qstr *name,
5014 struct nfs4_fs_locations *fs_locations,
5015 struct page *page)
5016{
5017 struct nfs4_exception exception = { };
5018 int err;
5019 do {
5020 err = nfs4_handle_exception(NFS_SERVER(dir),
5021 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5022 &exception);
5023 } while (exception.retry);
5024 return err;
5025}
5026
5027static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5028{
5029 int status;
5030 struct nfs4_secinfo_arg args = {
5031 .dir_fh = NFS_FH(dir),
5032 .name = name,
5033 };
5034 struct nfs4_secinfo_res res = {
5035 .flavors = flavors,
5036 };
5037 struct rpc_message msg = {
5038 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5039 .rpc_argp = &args,
5040 .rpc_resp = &res,
5041 };
5042
5043 dprintk("NFS call secinfo %s\n", name->name);
5044 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5045 dprintk("NFS reply secinfo: %d\n", status);
5046 return status;
5047}
5048
5049int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5050 struct nfs4_secinfo_flavors *flavors)
5051{
5052 struct nfs4_exception exception = { };
5053 int err;
5054 do {
5055 err = nfs4_handle_exception(NFS_SERVER(dir),
5056 _nfs4_proc_secinfo(dir, name, flavors),
5057 &exception);
5058 } while (exception.retry);
5059 return err;
5060}
5061
5062#ifdef CONFIG_NFS_V4_1
5063/*
5064 * Check the exchange flags returned by the server for invalid flags, having
5065 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5066 * DS flags set.
5067 */
5068static int nfs4_check_cl_exchange_flags(u32 flags)
5069{
5070 if (flags & ~EXCHGID4_FLAG_MASK_R)
5071 goto out_inval;
5072 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5073 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5074 goto out_inval;
5075 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5076 goto out_inval;
5077 return NFS_OK;
5078out_inval:
5079 return -NFS4ERR_INVAL;
5080}
5081
5082static bool
5083nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
5084{
5085 if (a->server_scope_sz == b->server_scope_sz &&
5086 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5087 return true;
5088
5089 return false;
5090}
5091
5092/*
5093 * nfs4_proc_exchange_id()
5094 *
5095 * Since the clientid has expired, all compounds using sessions
5096 * associated with the stale clientid will be returning
5097 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5098 * be in some phase of session reset.
5099 */
5100int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5101{
5102 nfs4_verifier verifier;
5103 struct nfs41_exchange_id_args args = {
5104 .verifier = &verifier,
5105 .client = clp,
5106 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5107 };
5108 struct nfs41_exchange_id_res res = {
5109 .client = clp,
5110 };
5111 int status;
5112 struct rpc_message msg = {
5113 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5114 .rpc_argp = &args,
5115 .rpc_resp = &res,
5116 .rpc_cred = cred,
5117 };
5118
5119 dprintk("--> %s\n", __func__);
5120 BUG_ON(clp == NULL);
5121
5122 nfs4_construct_boot_verifier(clp, &verifier);
5123
5124 args.id_len = scnprintf(args.id, sizeof(args.id),
5125 "%s/%s/%u",
5126 clp->cl_ipaddr,
5127 clp->cl_rpcclient->cl_nodename,
5128 clp->cl_rpcclient->cl_auth->au_flavor);
5129
5130 res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
5131 if (unlikely(!res.server_scope)) {
5132 status = -ENOMEM;
5133 goto out;
5134 }
5135
5136 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5137 if (unlikely(!res.impl_id)) {
5138 status = -ENOMEM;
5139 goto out_server_scope;
5140 }
5141
5142 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5143 if (!status)
5144 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5145
5146 if (!status) {
5147 /* use the most recent implementation id */
5148 kfree(clp->impl_id);
5149 clp->impl_id = res.impl_id;
5150 } else
5151 kfree(res.impl_id);
5152
5153 if (!status) {
5154 if (clp->server_scope &&
5155 !nfs41_same_server_scope(clp->server_scope,
5156 res.server_scope)) {
5157 dprintk("%s: server_scope mismatch detected\n",
5158 __func__);
5159 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5160 kfree(clp->server_scope);
5161 clp->server_scope = NULL;
5162 }
5163
5164 if (!clp->server_scope) {
5165 clp->server_scope = res.server_scope;
5166 goto out;
5167 }
5168 }
5169
5170out_server_scope:
5171 kfree(res.server_scope);
5172out:
5173 if (clp->impl_id)
5174 dprintk("%s: Server Implementation ID: "
5175 "domain: %s, name: %s, date: %llu,%u\n",
5176 __func__, clp->impl_id->domain, clp->impl_id->name,
5177 clp->impl_id->date.seconds,
5178 clp->impl_id->date.nseconds);
5179 dprintk("<-- %s status= %d\n", __func__, status);
5180 return status;
5181}
5182
5183struct nfs4_get_lease_time_data {
5184 struct nfs4_get_lease_time_args *args;
5185 struct nfs4_get_lease_time_res *res;
5186 struct nfs_client *clp;
5187};
5188
5189static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5190 void *calldata)
5191{
5192 int ret;
5193 struct nfs4_get_lease_time_data *data =
5194 (struct nfs4_get_lease_time_data *)calldata;
5195
5196 dprintk("--> %s\n", __func__);
5197 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5198 /* just setup sequence, do not trigger session recovery
5199 since we're invoked within one */
5200 ret = nfs41_setup_sequence(data->clp->cl_session,
5201 &data->args->la_seq_args,
5202 &data->res->lr_seq_res, task);
5203
5204 BUG_ON(ret == -EAGAIN);
5205 rpc_call_start(task);
5206 dprintk("<-- %s\n", __func__);
5207}
5208
5209/*
5210 * Called from nfs4_state_manager thread for session setup, so don't recover
5211 * from sequence operation or clientid errors.
5212 */
5213static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5214{
5215 struct nfs4_get_lease_time_data *data =
5216 (struct nfs4_get_lease_time_data *)calldata;
5217
5218 dprintk("--> %s\n", __func__);
5219 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5220 return;
5221 switch (task->tk_status) {
5222 case -NFS4ERR_DELAY:
5223 case -NFS4ERR_GRACE:
5224 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5225 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5226 task->tk_status = 0;
5227 /* fall through */
5228 case -NFS4ERR_RETRY_UNCACHED_REP:
5229 rpc_restart_call_prepare(task);
5230 return;
5231 }
5232 dprintk("<-- %s\n", __func__);
5233}
5234
5235static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5236 .rpc_call_prepare = nfs4_get_lease_time_prepare,
5237 .rpc_call_done = nfs4_get_lease_time_done,
5238};
5239
5240int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5241{
5242 struct rpc_task *task;
5243 struct nfs4_get_lease_time_args args;
5244 struct nfs4_get_lease_time_res res = {
5245 .lr_fsinfo = fsinfo,
5246 };
5247 struct nfs4_get_lease_time_data data = {
5248 .args = &args,
5249 .res = &res,
5250 .clp = clp,
5251 };
5252 struct rpc_message msg = {
5253 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5254 .rpc_argp = &args,
5255 .rpc_resp = &res,
5256 };
5257 struct rpc_task_setup task_setup = {
5258 .rpc_client = clp->cl_rpcclient,
5259 .rpc_message = &msg,
5260 .callback_ops = &nfs4_get_lease_time_ops,
5261 .callback_data = &data,
5262 .flags = RPC_TASK_TIMEOUT,
5263 };
5264 int status;
5265
5266 nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5267 dprintk("--> %s\n", __func__);
5268 task = rpc_run_task(&task_setup);
5269
5270 if (IS_ERR(task))
5271 status = PTR_ERR(task);
5272 else {
5273 status = task->tk_status;
5274 rpc_put_task(task);
5275 }
5276 dprintk("<-- %s return %d\n", __func__, status);
5277
5278 return status;
5279}
5280
5281static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5282{
5283 return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5284}
5285
5286static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5287 struct nfs4_slot *new,
5288 u32 max_slots,
5289 u32 ivalue)
5290{
5291 struct nfs4_slot *old = NULL;
5292 u32 i;
5293
5294 spin_lock(&tbl->slot_tbl_lock);
5295 if (new) {
5296 old = tbl->slots;
5297 tbl->slots = new;
5298 tbl->max_slots = max_slots;
5299 }
5300 tbl->highest_used_slotid = -1; /* no slot is currently used */
5301 for (i = 0; i < tbl->max_slots; i++)
5302 tbl->slots[i].seq_nr = ivalue;
5303 spin_unlock(&tbl->slot_tbl_lock);
5304 kfree(old);
5305}
5306
5307/*
5308 * (re)Initialise a slot table
5309 */
5310static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5311 u32 ivalue)
5312{
5313 struct nfs4_slot *new = NULL;
5314 int ret = -ENOMEM;
5315
5316 dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5317 max_reqs, tbl->max_slots);
5318
5319 /* Does the newly negotiated max_reqs match the existing slot table? */
5320 if (max_reqs != tbl->max_slots) {
5321 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5322 if (!new)
5323 goto out;
5324 }
5325 ret = 0;
5326
5327 nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5328 dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5329 tbl, tbl->slots, tbl->max_slots);
5330out:
5331 dprintk("<-- %s: return %d\n", __func__, ret);
5332 return ret;
5333}
5334
5335/* Destroy the slot table */
5336static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5337{
5338 if (session->fc_slot_table.slots != NULL) {
5339 kfree(session->fc_slot_table.slots);
5340 session->fc_slot_table.slots = NULL;
5341 }
5342 if (session->bc_slot_table.slots != NULL) {
5343 kfree(session->bc_slot_table.slots);
5344 session->bc_slot_table.slots = NULL;
5345 }
5346 return;
5347}
5348
5349/*
5350 * Initialize or reset the forechannel and backchannel tables
5351 */
5352static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5353{
5354 struct nfs4_slot_table *tbl;
5355 int status;
5356
5357 dprintk("--> %s\n", __func__);
5358 /* Fore channel */
5359 tbl = &ses->fc_slot_table;
5360 status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5361 if (status) /* -ENOMEM */
5362 return status;
5363 /* Back channel */
5364 tbl = &ses->bc_slot_table;
5365 status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5366 if (status && tbl->slots == NULL)
5367 /* Fore and back channel share a connection so get
5368 * both slot tables or neither */
5369 nfs4_destroy_slot_tables(ses);
5370 return status;
5371}
5372
5373struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5374{
5375 struct nfs4_session *session;
5376 struct nfs4_slot_table *tbl;
5377
5378 session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5379 if (!session)
5380 return NULL;
5381
5382 tbl = &session->fc_slot_table;
5383 tbl->highest_used_slotid = NFS4_NO_SLOT;
5384 spin_lock_init(&tbl->slot_tbl_lock);
5385 rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5386 init_completion(&tbl->complete);
5387
5388 tbl = &session->bc_slot_table;
5389 tbl->highest_used_slotid = NFS4_NO_SLOT;
5390 spin_lock_init(&tbl->slot_tbl_lock);
5391 rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5392 init_completion(&tbl->complete);
5393
5394 session->session_state = 1<<NFS4_SESSION_INITING;
5395
5396 session->clp = clp;
5397 return session;
5398}
5399
5400void nfs4_destroy_session(struct nfs4_session *session)
5401{
5402 struct rpc_xprt *xprt;
5403
5404 nfs4_proc_destroy_session(session);
5405
5406 rcu_read_lock();
5407 xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5408 rcu_read_unlock();
5409 dprintk("%s Destroy backchannel for xprt %p\n",
5410 __func__, xprt);
5411 xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5412 nfs4_destroy_slot_tables(session);
5413 kfree(session);
5414}
5415
5416/*
5417 * Initialize the values to be used by the client in CREATE_SESSION
5418 * If nfs4_init_session set the fore channel request and response sizes,
5419 * use them.
5420 *
5421 * Set the back channel max_resp_sz_cached to zero to force the client to
5422 * always set csa_cachethis to FALSE because the current implementation
5423 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5424 */
5425static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5426{
5427 struct nfs4_session *session = args->client->cl_session;
5428 unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5429 mxresp_sz = session->fc_attrs.max_resp_sz;
5430
5431 if (mxrqst_sz == 0)
5432 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5433 if (mxresp_sz == 0)
5434 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5435 /* Fore channel attributes */
5436 args->fc_attrs.max_rqst_sz = mxrqst_sz;
5437 args->fc_attrs.max_resp_sz = mxresp_sz;
5438 args->fc_attrs.max_ops = NFS4_MAX_OPS;
5439 args->fc_attrs.max_reqs = max_session_slots;
5440
5441 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5442 "max_ops=%u max_reqs=%u\n",
5443 __func__,
5444 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5445 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5446
5447 /* Back channel attributes */
5448 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5449 args->bc_attrs.max_resp_sz = PAGE_SIZE;
5450 args->bc_attrs.max_resp_sz_cached = 0;
5451 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5452 args->bc_attrs.max_reqs = 1;
5453
5454 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5455 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5456 __func__,
5457 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5458 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5459 args->bc_attrs.max_reqs);
5460}
5461
5462static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5463{
5464 struct nfs4_channel_attrs *sent = &args->fc_attrs;
5465 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5466
5467 if (rcvd->max_resp_sz > sent->max_resp_sz)
5468 return -EINVAL;
5469 /*
5470 * Our requested max_ops is the minimum we need; we're not
5471 * prepared to break up compounds into smaller pieces than that.
5472 * So, no point even trying to continue if the server won't
5473 * cooperate:
5474 */
5475 if (rcvd->max_ops < sent->max_ops)
5476 return -EINVAL;
5477 if (rcvd->max_reqs == 0)
5478 return -EINVAL;
5479 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5480 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5481 return 0;
5482}
5483
5484static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5485{
5486 struct nfs4_channel_attrs *sent = &args->bc_attrs;
5487 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5488
5489 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5490 return -EINVAL;
5491 if (rcvd->max_resp_sz < sent->max_resp_sz)
5492 return -EINVAL;
5493 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5494 return -EINVAL;
5495 /* These would render the backchannel useless: */
5496 if (rcvd->max_ops != sent->max_ops)
5497 return -EINVAL;
5498 if (rcvd->max_reqs != sent->max_reqs)
5499 return -EINVAL;
5500 return 0;
5501}
5502
5503static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5504 struct nfs4_session *session)
5505{
5506 int ret;
5507
5508 ret = nfs4_verify_fore_channel_attrs(args, session);
5509 if (ret)
5510 return ret;
5511 return nfs4_verify_back_channel_attrs(args, session);
5512}
5513
5514static int _nfs4_proc_create_session(struct nfs_client *clp)
5515{
5516 struct nfs4_session *session = clp->cl_session;
5517 struct nfs41_create_session_args args = {
5518 .client = clp,
5519 .cb_program = NFS4_CALLBACK,
5520 };
5521 struct nfs41_create_session_res res = {
5522 .client = clp,
5523 };
5524 struct rpc_message msg = {
5525 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5526 .rpc_argp = &args,
5527 .rpc_resp = &res,
5528 };
5529 int status;
5530
5531 nfs4_init_channel_attrs(&args);
5532 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5533
5534 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5535
5536 if (!status)
5537 /* Verify the session's negotiated channel_attrs values */
5538 status = nfs4_verify_channel_attrs(&args, session);
5539 if (!status) {
5540 /* Increment the clientid slot sequence id */
5541 clp->cl_seqid++;
5542 }
5543
5544 return status;
5545}
5546
5547/*
5548 * Issues a CREATE_SESSION operation to the server.
5549 * It is the responsibility of the caller to verify the session is
5550 * expired before calling this routine.
5551 */
5552int nfs4_proc_create_session(struct nfs_client *clp)
5553{
5554 int status;
5555 unsigned *ptr;
5556 struct nfs4_session *session = clp->cl_session;
5557
5558 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5559
5560 status = _nfs4_proc_create_session(clp);
5561 if (status)
5562 goto out;
5563
5564 /* Init or reset the session slot tables */
5565 status = nfs4_setup_session_slot_tables(session);
5566 dprintk("slot table setup returned %d\n", status);
5567 if (status)
5568 goto out;
5569
5570 ptr = (unsigned *)&session->sess_id.data[0];
5571 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5572 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5573out:
5574 dprintk("<-- %s\n", __func__);
5575 return status;
5576}
5577
5578/*
5579 * Issue the over-the-wire RPC DESTROY_SESSION.
5580 * The caller must serialize access to this routine.
5581 */
5582int nfs4_proc_destroy_session(struct nfs4_session *session)
5583{
5584 int status = 0;
5585 struct rpc_message msg;
5586
5587 dprintk("--> nfs4_proc_destroy_session\n");
5588
5589 /* session is still being setup */
5590 if (session->clp->cl_cons_state != NFS_CS_READY)
5591 return status;
5592
5593 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5594 msg.rpc_argp = session;
5595 msg.rpc_resp = NULL;
5596 msg.rpc_cred = NULL;
5597 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5598
5599 if (status)
5600 printk(KERN_WARNING
5601 "NFS: Got error %d from the server on DESTROY_SESSION. "
5602 "Session has been destroyed regardless...\n", status);
5603
5604 dprintk("<-- nfs4_proc_destroy_session\n");
5605 return status;
5606}
5607
5608int nfs4_init_session(struct nfs_server *server)
5609{
5610 struct nfs_client *clp = server->nfs_client;
5611 struct nfs4_session *session;
5612 unsigned int rsize, wsize;
5613 int ret;
5614
5615 if (!nfs4_has_session(clp))
5616 return 0;
5617
5618 session = clp->cl_session;
5619 if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5620 return 0;
5621
5622 rsize = server->rsize;
5623 if (rsize == 0)
5624 rsize = NFS_MAX_FILE_IO_SIZE;
5625 wsize = server->wsize;
5626 if (wsize == 0)
5627 wsize = NFS_MAX_FILE_IO_SIZE;
5628
5629 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5630 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5631
5632 ret = nfs4_recover_expired_lease(server);
5633 if (!ret)
5634 ret = nfs4_check_client_ready(clp);
5635 return ret;
5636}
5637
5638int nfs4_init_ds_session(struct nfs_client *clp)
5639{
5640 struct nfs4_session *session = clp->cl_session;
5641 int ret;
5642
5643 if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5644 return 0;
5645
5646 ret = nfs4_client_recover_expired_lease(clp);
5647 if (!ret)
5648 /* Test for the DS role */
5649 if (!is_ds_client(clp))
5650 ret = -ENODEV;
5651 if (!ret)
5652 ret = nfs4_check_client_ready(clp);
5653 return ret;
5654
5655}
5656EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5657
5658
5659/*
5660 * Renew the cl_session lease.
5661 */
5662struct nfs4_sequence_data {
5663 struct nfs_client *clp;
5664 struct nfs4_sequence_args args;
5665 struct nfs4_sequence_res res;
5666};
5667
5668static void nfs41_sequence_release(void *data)
5669{
5670 struct nfs4_sequence_data *calldata = data;
5671 struct nfs_client *clp = calldata->clp;
5672
5673 if (atomic_read(&clp->cl_count) > 1)
5674 nfs4_schedule_state_renewal(clp);
5675 nfs_put_client(clp);
5676 kfree(calldata);
5677}
5678
5679static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5680{
5681 switch(task->tk_status) {
5682 case -NFS4ERR_DELAY:
5683 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5684 return -EAGAIN;
5685 default:
5686 nfs4_schedule_lease_recovery(clp);
5687 }
5688 return 0;
5689}
5690
5691static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5692{
5693 struct nfs4_sequence_data *calldata = data;
5694 struct nfs_client *clp = calldata->clp;
5695
5696 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5697 return;
5698
5699 if (task->tk_status < 0) {
5700 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5701 if (atomic_read(&clp->cl_count) == 1)
5702 goto out;
5703
5704 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5705 rpc_restart_call_prepare(task);
5706 return;
5707 }
5708 }
5709 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5710out:
5711 dprintk("<-- %s\n", __func__);
5712}
5713
5714static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5715{
5716 struct nfs4_sequence_data *calldata = data;
5717 struct nfs_client *clp = calldata->clp;
5718 struct nfs4_sequence_args *args;
5719 struct nfs4_sequence_res *res;
5720
5721 args = task->tk_msg.rpc_argp;
5722 res = task->tk_msg.rpc_resp;
5723
5724 if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5725 return;
5726 rpc_call_start(task);
5727}
5728
5729static const struct rpc_call_ops nfs41_sequence_ops = {
5730 .rpc_call_done = nfs41_sequence_call_done,
5731 .rpc_call_prepare = nfs41_sequence_prepare,
5732 .rpc_release = nfs41_sequence_release,
5733};
5734
5735static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5736{
5737 struct nfs4_sequence_data *calldata;
5738 struct rpc_message msg = {
5739 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5740 .rpc_cred = cred,
5741 };
5742 struct rpc_task_setup task_setup_data = {
5743 .rpc_client = clp->cl_rpcclient,
5744 .rpc_message = &msg,
5745 .callback_ops = &nfs41_sequence_ops,
5746 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5747 };
5748
5749 if (!atomic_inc_not_zero(&clp->cl_count))
5750 return ERR_PTR(-EIO);
5751 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5752 if (calldata == NULL) {
5753 nfs_put_client(clp);
5754 return ERR_PTR(-ENOMEM);
5755 }
5756 nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5757 msg.rpc_argp = &calldata->args;
5758 msg.rpc_resp = &calldata->res;
5759 calldata->clp = clp;
5760 task_setup_data.callback_data = calldata;
5761
5762 return rpc_run_task(&task_setup_data);
5763}
5764
5765static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5766{
5767 struct rpc_task *task;
5768 int ret = 0;
5769
5770 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5771 return 0;
5772 task = _nfs41_proc_sequence(clp, cred);
5773 if (IS_ERR(task))
5774 ret = PTR_ERR(task);
5775 else
5776 rpc_put_task_async(task);
5777 dprintk("<-- %s status=%d\n", __func__, ret);
5778 return ret;
5779}
5780
5781static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5782{
5783 struct rpc_task *task;
5784 int ret;
5785
5786 task = _nfs41_proc_sequence(clp, cred);
5787 if (IS_ERR(task)) {
5788 ret = PTR_ERR(task);
5789 goto out;
5790 }
5791 ret = rpc_wait_for_completion_task(task);
5792 if (!ret) {
5793 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5794
5795 if (task->tk_status == 0)
5796 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5797 ret = task->tk_status;
5798 }
5799 rpc_put_task(task);
5800out:
5801 dprintk("<-- %s status=%d\n", __func__, ret);
5802 return ret;
5803}
5804
5805struct nfs4_reclaim_complete_data {
5806 struct nfs_client *clp;
5807 struct nfs41_reclaim_complete_args arg;
5808 struct nfs41_reclaim_complete_res res;
5809};
5810
5811static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5812{
5813 struct nfs4_reclaim_complete_data *calldata = data;
5814
5815 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5816 if (nfs41_setup_sequence(calldata->clp->cl_session,
5817 &calldata->arg.seq_args,
5818 &calldata->res.seq_res, task))
5819 return;
5820
5821 rpc_call_start(task);
5822}
5823
5824static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5825{
5826 switch(task->tk_status) {
5827 case 0:
5828 case -NFS4ERR_COMPLETE_ALREADY:
5829 case -NFS4ERR_WRONG_CRED: /* What to do here? */
5830 break;
5831 case -NFS4ERR_DELAY:
5832 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5833 /* fall through */
5834 case -NFS4ERR_RETRY_UNCACHED_REP:
5835 return -EAGAIN;
5836 default:
5837 nfs4_schedule_lease_recovery(clp);
5838 }
5839 return 0;
5840}
5841
5842static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5843{
5844 struct nfs4_reclaim_complete_data *calldata = data;
5845 struct nfs_client *clp = calldata->clp;
5846 struct nfs4_sequence_res *res = &calldata->res.seq_res;
5847
5848 dprintk("--> %s\n", __func__);
5849 if (!nfs41_sequence_done(task, res))
5850 return;
5851
5852 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5853 rpc_restart_call_prepare(task);
5854 return;
5855 }
5856 dprintk("<-- %s\n", __func__);
5857}
5858
5859static void nfs4_free_reclaim_complete_data(void *data)
5860{
5861 struct nfs4_reclaim_complete_data *calldata = data;
5862
5863 kfree(calldata);
5864}
5865
5866static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5867 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5868 .rpc_call_done = nfs4_reclaim_complete_done,
5869 .rpc_release = nfs4_free_reclaim_complete_data,
5870};
5871
5872/*
5873 * Issue a global reclaim complete.
5874 */
5875static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5876{
5877 struct nfs4_reclaim_complete_data *calldata;
5878 struct rpc_task *task;
5879 struct rpc_message msg = {
5880 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5881 };
5882 struct rpc_task_setup task_setup_data = {
5883 .rpc_client = clp->cl_rpcclient,
5884 .rpc_message = &msg,
5885 .callback_ops = &nfs4_reclaim_complete_call_ops,
5886 .flags = RPC_TASK_ASYNC,
5887 };
5888 int status = -ENOMEM;
5889
5890 dprintk("--> %s\n", __func__);
5891 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5892 if (calldata == NULL)
5893 goto out;
5894 calldata->clp = clp;
5895 calldata->arg.one_fs = 0;
5896
5897 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5898 msg.rpc_argp = &calldata->arg;
5899 msg.rpc_resp = &calldata->res;
5900 task_setup_data.callback_data = calldata;
5901 task = rpc_run_task(&task_setup_data);
5902 if (IS_ERR(task)) {
5903 status = PTR_ERR(task);
5904 goto out;
5905 }
5906 status = nfs4_wait_for_completion_rpc_task(task);
5907 if (status == 0)
5908 status = task->tk_status;
5909 rpc_put_task(task);
5910 return 0;
5911out:
5912 dprintk("<-- %s status=%d\n", __func__, status);
5913 return status;
5914}
5915
5916static void
5917nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5918{
5919 struct nfs4_layoutget *lgp = calldata;
5920 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5921
5922 dprintk("--> %s\n", __func__);
5923 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5924 * right now covering the LAYOUTGET we are about to send.
5925 * However, that is not so catastrophic, and there seems
5926 * to be no way to prevent it completely.
5927 */
5928 if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5929 &lgp->res.seq_res, task))
5930 return;
5931 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5932 NFS_I(lgp->args.inode)->layout,
5933 lgp->args.ctx->state)) {
5934 rpc_exit(task, NFS4_OK);
5935 return;
5936 }
5937 rpc_call_start(task);
5938}
5939
5940static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5941{
5942 struct nfs4_layoutget *lgp = calldata;
5943 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5944
5945 dprintk("--> %s\n", __func__);
5946
5947 if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5948 return;
5949
5950 switch (task->tk_status) {
5951 case 0:
5952 break;
5953 case -NFS4ERR_LAYOUTTRYLATER:
5954 case -NFS4ERR_RECALLCONFLICT:
5955 task->tk_status = -NFS4ERR_DELAY;
5956 /* Fall through */
5957 default:
5958 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5959 rpc_restart_call_prepare(task);
5960 return;
5961 }
5962 }
5963 dprintk("<-- %s\n", __func__);
5964}
5965
5966static void nfs4_layoutget_release(void *calldata)
5967{
5968 struct nfs4_layoutget *lgp = calldata;
5969
5970 dprintk("--> %s\n", __func__);
5971 put_nfs_open_context(lgp->args.ctx);
5972 kfree(calldata);
5973 dprintk("<-- %s\n", __func__);
5974}
5975
5976static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5977 .rpc_call_prepare = nfs4_layoutget_prepare,
5978 .rpc_call_done = nfs4_layoutget_done,
5979 .rpc_release = nfs4_layoutget_release,
5980};
5981
5982int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5983{
5984 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5985 struct rpc_task *task;
5986 struct rpc_message msg = {
5987 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5988 .rpc_argp = &lgp->args,
5989 .rpc_resp = &lgp->res,
5990 };
5991 struct rpc_task_setup task_setup_data = {
5992 .rpc_client = server->client,
5993 .rpc_message = &msg,
5994 .callback_ops = &nfs4_layoutget_call_ops,
5995 .callback_data = lgp,
5996 .flags = RPC_TASK_ASYNC,
5997 };
5998 int status = 0;
5999
6000 dprintk("--> %s\n", __func__);
6001
6002 lgp->res.layoutp = &lgp->args.layout;
6003 lgp->res.seq_res.sr_slot = NULL;
6004 nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6005 task = rpc_run_task(&task_setup_data);
6006 if (IS_ERR(task))
6007 return PTR_ERR(task);
6008 status = nfs4_wait_for_completion_rpc_task(task);
6009 if (status == 0)
6010 status = task->tk_status;
6011 if (status == 0)
6012 status = pnfs_layout_process(lgp);
6013 rpc_put_task(task);
6014 dprintk("<-- %s status=%d\n", __func__, status);
6015 return status;
6016}
6017
6018static void
6019nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6020{
6021 struct nfs4_layoutreturn *lrp = calldata;
6022
6023 dprintk("--> %s\n", __func__);
6024 if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6025 &lrp->res.seq_res, task))
6026 return;
6027 rpc_call_start(task);
6028}
6029
6030static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6031{
6032 struct nfs4_layoutreturn *lrp = calldata;
6033 struct nfs_server *server;
6034 struct pnfs_layout_hdr *lo = lrp->args.layout;
6035
6036 dprintk("--> %s\n", __func__);
6037
6038 if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6039 return;
6040
6041 server = NFS_SERVER(lrp->args.inode);
6042 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6043 rpc_restart_call_prepare(task);
6044 return;
6045 }
6046 spin_lock(&lo->plh_inode->i_lock);
6047 if (task->tk_status == 0) {
6048 if (lrp->res.lrs_present) {
6049 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6050 } else
6051 BUG_ON(!list_empty(&lo->plh_segs));
6052 }
6053 lo->plh_block_lgets--;
6054 spin_unlock(&lo->plh_inode->i_lock);
6055 dprintk("<-- %s\n", __func__);
6056}
6057
6058static void nfs4_layoutreturn_release(void *calldata)
6059{
6060 struct nfs4_layoutreturn *lrp = calldata;
6061
6062 dprintk("--> %s\n", __func__);
6063 put_layout_hdr(lrp->args.layout);
6064 kfree(calldata);
6065 dprintk("<-- %s\n", __func__);
6066}
6067
6068static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6069 .rpc_call_prepare = nfs4_layoutreturn_prepare,
6070 .rpc_call_done = nfs4_layoutreturn_done,
6071 .rpc_release = nfs4_layoutreturn_release,
6072};
6073
6074int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6075{
6076 struct rpc_task *task;
6077 struct rpc_message msg = {
6078 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6079 .rpc_argp = &lrp->args,
6080 .rpc_resp = &lrp->res,
6081 };
6082 struct rpc_task_setup task_setup_data = {
6083 .rpc_client = lrp->clp->cl_rpcclient,
6084 .rpc_message = &msg,
6085 .callback_ops = &nfs4_layoutreturn_call_ops,
6086 .callback_data = lrp,
6087 };
6088 int status;
6089
6090 dprintk("--> %s\n", __func__);
6091 nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6092 task = rpc_run_task(&task_setup_data);
6093 if (IS_ERR(task))
6094 return PTR_ERR(task);
6095 status = task->tk_status;
6096 dprintk("<-- %s status=%d\n", __func__, status);
6097 rpc_put_task(task);
6098 return status;
6099}
6100
6101/*
6102 * Retrieve the list of Data Server devices from the MDS.
6103 */
6104static int _nfs4_getdevicelist(struct nfs_server *server,
6105 const struct nfs_fh *fh,
6106 struct pnfs_devicelist *devlist)
6107{
6108 struct nfs4_getdevicelist_args args = {
6109 .fh = fh,
6110 .layoutclass = server->pnfs_curr_ld->id,
6111 };
6112 struct nfs4_getdevicelist_res res = {
6113 .devlist = devlist,
6114 };
6115 struct rpc_message msg = {
6116 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6117 .rpc_argp = &args,
6118 .rpc_resp = &res,
6119 };
6120 int status;
6121
6122 dprintk("--> %s\n", __func__);
6123 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6124 &res.seq_res, 0);
6125 dprintk("<-- %s status=%d\n", __func__, status);
6126 return status;
6127}
6128
6129int nfs4_proc_getdevicelist(struct nfs_server *server,
6130 const struct nfs_fh *fh,
6131 struct pnfs_devicelist *devlist)
6132{
6133 struct nfs4_exception exception = { };
6134 int err;
6135
6136 do {
6137 err = nfs4_handle_exception(server,
6138 _nfs4_getdevicelist(server, fh, devlist),
6139 &exception);
6140 } while (exception.retry);
6141
6142 dprintk("%s: err=%d, num_devs=%u\n", __func__,
6143 err, devlist->num_devs);
6144
6145 return err;
6146}
6147EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6148
6149static int
6150_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6151{
6152 struct nfs4_getdeviceinfo_args args = {
6153 .pdev = pdev,
6154 };
6155 struct nfs4_getdeviceinfo_res res = {
6156 .pdev = pdev,
6157 };
6158 struct rpc_message msg = {
6159 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6160 .rpc_argp = &args,
6161 .rpc_resp = &res,
6162 };
6163 int status;
6164
6165 dprintk("--> %s\n", __func__);
6166 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6167 dprintk("<-- %s status=%d\n", __func__, status);
6168
6169 return status;
6170}
6171
6172int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6173{
6174 struct nfs4_exception exception = { };
6175 int err;
6176
6177 do {
6178 err = nfs4_handle_exception(server,
6179 _nfs4_proc_getdeviceinfo(server, pdev),
6180 &exception);
6181 } while (exception.retry);
6182 return err;
6183}
6184EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6185
6186static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6187{
6188 struct nfs4_layoutcommit_data *data = calldata;
6189 struct nfs_server *server = NFS_SERVER(data->args.inode);
6190
6191 if (nfs4_setup_sequence(server, &data->args.seq_args,
6192 &data->res.seq_res, task))
6193 return;
6194 rpc_call_start(task);
6195}
6196
6197static void
6198nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6199{
6200 struct nfs4_layoutcommit_data *data = calldata;
6201 struct nfs_server *server = NFS_SERVER(data->args.inode);
6202
6203 if (!nfs4_sequence_done(task, &data->res.seq_res))
6204 return;
6205
6206 switch (task->tk_status) { /* Just ignore these failures */
6207 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6208 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
6209 case -NFS4ERR_BADLAYOUT: /* no layout */
6210 case -NFS4ERR_GRACE: /* loca_recalim always false */
6211 task->tk_status = 0;
6212 break;
6213 case 0:
6214 nfs_post_op_update_inode_force_wcc(data->args.inode,
6215 data->res.fattr);
6216 break;
6217 default:
6218 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6219 rpc_restart_call_prepare(task);
6220 return;
6221 }
6222 }
6223}
6224
6225static void nfs4_layoutcommit_release(void *calldata)
6226{
6227 struct nfs4_layoutcommit_data *data = calldata;
6228 struct pnfs_layout_segment *lseg, *tmp;
6229 unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6230
6231 pnfs_cleanup_layoutcommit(data);
6232 /* Matched by references in pnfs_set_layoutcommit */
6233 list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6234 list_del_init(&lseg->pls_lc_list);
6235 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6236 &lseg->pls_flags))
6237 put_lseg(lseg);
6238 }
6239
6240 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6241 smp_mb__after_clear_bit();
6242 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6243
6244 put_rpccred(data->cred);
6245 kfree(data);
6246}
6247
6248static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6249 .rpc_call_prepare = nfs4_layoutcommit_prepare,
6250 .rpc_call_done = nfs4_layoutcommit_done,
6251 .rpc_release = nfs4_layoutcommit_release,
6252};
6253
6254int
6255nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6256{
6257 struct rpc_message msg = {
6258 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6259 .rpc_argp = &data->args,
6260 .rpc_resp = &data->res,
6261 .rpc_cred = data->cred,
6262 };
6263 struct rpc_task_setup task_setup_data = {
6264 .task = &data->task,
6265 .rpc_client = NFS_CLIENT(data->args.inode),
6266 .rpc_message = &msg,
6267 .callback_ops = &nfs4_layoutcommit_ops,
6268 .callback_data = data,
6269 .flags = RPC_TASK_ASYNC,
6270 };
6271 struct rpc_task *task;
6272 int status = 0;
6273
6274 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6275 "lbw: %llu inode %lu\n",
6276 data->task.tk_pid, sync,
6277 data->args.lastbytewritten,
6278 data->args.inode->i_ino);
6279
6280 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6281 task = rpc_run_task(&task_setup_data);
6282 if (IS_ERR(task))
6283 return PTR_ERR(task);
6284 if (sync == false)
6285 goto out;
6286 status = nfs4_wait_for_completion_rpc_task(task);
6287 if (status != 0)
6288 goto out;
6289 status = task->tk_status;
6290out:
6291 dprintk("%s: status %d\n", __func__, status);
6292 rpc_put_task(task);
6293 return status;
6294}
6295
6296static int
6297_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6298 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6299{
6300 struct nfs41_secinfo_no_name_args args = {
6301 .style = SECINFO_STYLE_CURRENT_FH,
6302 };
6303 struct nfs4_secinfo_res res = {
6304 .flavors = flavors,
6305 };
6306 struct rpc_message msg = {
6307 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6308 .rpc_argp = &args,
6309 .rpc_resp = &res,
6310 };
6311 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6312}
6313
6314static int
6315nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6316 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6317{
6318 struct nfs4_exception exception = { };
6319 int err;
6320 do {
6321 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6322 switch (err) {
6323 case 0:
6324 case -NFS4ERR_WRONGSEC:
6325 case -NFS4ERR_NOTSUPP:
6326 goto out;
6327 default:
6328 err = nfs4_handle_exception(server, err, &exception);
6329 }
6330 } while (exception.retry);
6331out:
6332 return err;
6333}
6334
6335static int
6336nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6337 struct nfs_fsinfo *info)
6338{
6339 int err;
6340 struct page *page;
6341 rpc_authflavor_t flavor;
6342 struct nfs4_secinfo_flavors *flavors;
6343
6344 page = alloc_page(GFP_KERNEL);
6345 if (!page) {
6346 err = -ENOMEM;
6347 goto out;
6348 }
6349
6350 flavors = page_address(page);
6351 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6352
6353 /*
6354 * Fall back on "guess and check" method if
6355 * the server doesn't support SECINFO_NO_NAME
6356 */
6357 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6358 err = nfs4_find_root_sec(server, fhandle, info);
6359 goto out_freepage;
6360 }
6361 if (err)
6362 goto out_freepage;
6363
6364 flavor = nfs_find_best_sec(flavors);
6365 if (err == 0)
6366 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6367
6368out_freepage:
6369 put_page(page);
6370 if (err == -EACCES)
6371 return -EPERM;
6372out:
6373 return err;
6374}
6375
6376static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6377{
6378 int status;
6379 struct nfs41_test_stateid_args args = {
6380 .stateid = stateid,
6381 };
6382 struct nfs41_test_stateid_res res;
6383 struct rpc_message msg = {
6384 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6385 .rpc_argp = &args,
6386 .rpc_resp = &res,
6387 };
6388
6389 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6390 status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6391
6392 if (status == NFS_OK)
6393 return res.status;
6394 return status;
6395}
6396
6397static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6398{
6399 struct nfs4_exception exception = { };
6400 int err;
6401 do {
6402 err = nfs4_handle_exception(server,
6403 _nfs41_test_stateid(server, stateid),
6404 &exception);
6405 } while (exception.retry);
6406 return err;
6407}
6408
6409static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6410{
6411 struct nfs41_free_stateid_args args = {
6412 .stateid = stateid,
6413 };
6414 struct nfs41_free_stateid_res res;
6415 struct rpc_message msg = {
6416 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6417 .rpc_argp = &args,
6418 .rpc_resp = &res,
6419 };
6420
6421 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6422 return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6423}
6424
6425static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6426{
6427 struct nfs4_exception exception = { };
6428 int err;
6429 do {
6430 err = nfs4_handle_exception(server,
6431 _nfs4_free_stateid(server, stateid),
6432 &exception);
6433 } while (exception.retry);
6434 return err;
6435}
6436
6437static bool nfs41_match_stateid(const nfs4_stateid *s1,
6438 const nfs4_stateid *s2)
6439{
6440 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6441 return false;
6442
6443 if (s1->seqid == s2->seqid)
6444 return true;
6445 if (s1->seqid == 0 || s2->seqid == 0)
6446 return true;
6447
6448 return false;
6449}
6450
6451#endif /* CONFIG_NFS_V4_1 */
6452
6453static bool nfs4_match_stateid(const nfs4_stateid *s1,
6454 const nfs4_stateid *s2)
6455{
6456 return nfs4_stateid_match(s1, s2);
6457}
6458
6459
6460static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6461 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6462 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6463 .recover_open = nfs4_open_reclaim,
6464 .recover_lock = nfs4_lock_reclaim,
6465 .establish_clid = nfs4_init_clientid,
6466 .get_clid_cred = nfs4_get_setclientid_cred,
6467};
6468
6469#if defined(CONFIG_NFS_V4_1)
6470static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6471 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6472 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6473 .recover_open = nfs4_open_reclaim,
6474 .recover_lock = nfs4_lock_reclaim,
6475 .establish_clid = nfs41_init_clientid,
6476 .get_clid_cred = nfs4_get_exchange_id_cred,
6477 .reclaim_complete = nfs41_proc_reclaim_complete,
6478};
6479#endif /* CONFIG_NFS_V4_1 */
6480
6481static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6482 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6483 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6484 .recover_open = nfs4_open_expired,
6485 .recover_lock = nfs4_lock_expired,
6486 .establish_clid = nfs4_init_clientid,
6487 .get_clid_cred = nfs4_get_setclientid_cred,
6488};
6489
6490#if defined(CONFIG_NFS_V4_1)
6491static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6492 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6493 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6494 .recover_open = nfs41_open_expired,
6495 .recover_lock = nfs41_lock_expired,
6496 .establish_clid = nfs41_init_clientid,
6497 .get_clid_cred = nfs4_get_exchange_id_cred,
6498};
6499#endif /* CONFIG_NFS_V4_1 */
6500
6501static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6502 .sched_state_renewal = nfs4_proc_async_renew,
6503 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6504 .renew_lease = nfs4_proc_renew,
6505};
6506
6507#if defined(CONFIG_NFS_V4_1)
6508static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6509 .sched_state_renewal = nfs41_proc_async_sequence,
6510 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6511 .renew_lease = nfs4_proc_sequence,
6512};
6513#endif
6514
6515static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6516 .minor_version = 0,
6517 .call_sync = _nfs4_call_sync,
6518 .match_stateid = nfs4_match_stateid,
6519 .find_root_sec = nfs4_find_root_sec,
6520 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6521 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6522 .state_renewal_ops = &nfs40_state_renewal_ops,
6523};
6524
6525#if defined(CONFIG_NFS_V4_1)
6526static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6527 .minor_version = 1,
6528 .call_sync = _nfs4_call_sync_session,
6529 .match_stateid = nfs41_match_stateid,
6530 .find_root_sec = nfs41_find_root_sec,
6531 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6532 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6533 .state_renewal_ops = &nfs41_state_renewal_ops,
6534};
6535#endif
6536
6537const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6538 [0] = &nfs_v4_0_minor_ops,
6539#if defined(CONFIG_NFS_V4_1)
6540 [1] = &nfs_v4_1_minor_ops,
6541#endif
6542};
6543
6544static const struct inode_operations nfs4_file_inode_operations = {
6545 .permission = nfs_permission,
6546 .getattr = nfs_getattr,
6547 .setattr = nfs_setattr,
6548 .getxattr = generic_getxattr,
6549 .setxattr = generic_setxattr,
6550 .listxattr = generic_listxattr,
6551 .removexattr = generic_removexattr,
6552};
6553
6554const struct nfs_rpc_ops nfs_v4_clientops = {
6555 .version = 4, /* protocol version */
6556 .dentry_ops = &nfs4_dentry_operations,
6557 .dir_inode_ops = &nfs4_dir_inode_operations,
6558 .file_inode_ops = &nfs4_file_inode_operations,
6559 .file_ops = &nfs4_file_operations,
6560 .getroot = nfs4_proc_get_root,
6561 .getattr = nfs4_proc_getattr,
6562 .setattr = nfs4_proc_setattr,
6563 .lookup = nfs4_proc_lookup,
6564 .access = nfs4_proc_access,
6565 .readlink = nfs4_proc_readlink,
6566 .create = nfs4_proc_create,
6567 .remove = nfs4_proc_remove,
6568 .unlink_setup = nfs4_proc_unlink_setup,
6569 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6570 .unlink_done = nfs4_proc_unlink_done,
6571 .rename = nfs4_proc_rename,
6572 .rename_setup = nfs4_proc_rename_setup,
6573 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6574 .rename_done = nfs4_proc_rename_done,
6575 .link = nfs4_proc_link,
6576 .symlink = nfs4_proc_symlink,
6577 .mkdir = nfs4_proc_mkdir,
6578 .rmdir = nfs4_proc_remove,
6579 .readdir = nfs4_proc_readdir,
6580 .mknod = nfs4_proc_mknod,
6581 .statfs = nfs4_proc_statfs,
6582 .fsinfo = nfs4_proc_fsinfo,
6583 .pathconf = nfs4_proc_pathconf,
6584 .set_capabilities = nfs4_server_capabilities,
6585 .decode_dirent = nfs4_decode_dirent,
6586 .read_setup = nfs4_proc_read_setup,
6587 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6588 .read_done = nfs4_read_done,
6589 .write_setup = nfs4_proc_write_setup,
6590 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6591 .write_done = nfs4_write_done,
6592 .commit_setup = nfs4_proc_commit_setup,
6593 .commit_done = nfs4_commit_done,
6594 .lock = nfs4_proc_lock,
6595 .clear_acl_cache = nfs4_zap_acl_attr,
6596 .close_context = nfs4_close_context,
6597 .open_context = nfs4_atomic_open,
6598 .init_client = nfs4_init_client,
6599 .secinfo = nfs4_proc_secinfo,
6600};
6601
6602static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6603 .prefix = XATTR_NAME_NFSV4_ACL,
6604 .list = nfs4_xattr_list_nfs4_acl,
6605 .get = nfs4_xattr_get_nfs4_acl,
6606 .set = nfs4_xattr_set_nfs4_acl,
6607};
6608
6609const struct xattr_handler *nfs4_xattr_handlers[] = {
6610 &nfs4_xattr_nfs4_acl_handler,
6611 NULL
6612};
6613
6614module_param(max_session_slots, ushort, 0644);
6615MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6616 "requests the client will negotiate");
6617
6618/*
6619 * Local variables:
6620 * c-basic-offset: 8
6621 * End:
6622 */
Linux 6.x block layer and io_uring tree(s)