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NFS: Use delegations to optimise ACCESS calls
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 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/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
101070ca 54#include "internal.h"
006ea73e 55#include "iostat.h"
1da177e4
LT		 56
57#define NFSDBG_FACILITY NFSDBG_PROC
58
2066fe89 59#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 60#define NFS4_POLL_RETRY_MAX (15*HZ)
61
cdd4e68b 62struct nfs4_opendata;
864472e9 63static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 64static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
9e33bed5 65static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
9936781d
TM		 66static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
67static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
1da177e4 68
1da177e4
LT		 69/* Prevent leaks of NFSv4 errors into userland */
70int nfs4_map_errors(int err)
71{
72 if (err < -1000) {
73 dprintk("%s could not handle NFSv4 error %d\n",
3110ff80 74 __func__, -err);
1da177e4
LT		 75 return -EIO;
76 }
77 return err;
78}
79
80/*
81 * This is our standard bitmap for GETATTR requests.
82 */
83const u32 nfs4_fattr_bitmap[2] = {
84 FATTR4_WORD0_TYPE
85 | FATTR4_WORD0_CHANGE
86 | FATTR4_WORD0_SIZE
87 | FATTR4_WORD0_FSID
88 | FATTR4_WORD0_FILEID,
89 FATTR4_WORD1_MODE
90 | FATTR4_WORD1_NUMLINKS
91 | FATTR4_WORD1_OWNER
92 | FATTR4_WORD1_OWNER_GROUP
93 | FATTR4_WORD1_RAWDEV
94 | FATTR4_WORD1_SPACE_USED
95 | FATTR4_WORD1_TIME_ACCESS
96 | FATTR4_WORD1_TIME_METADATA
97 | FATTR4_WORD1_TIME_MODIFY
98};
99
100const u32 nfs4_statfs_bitmap[2] = {
101 FATTR4_WORD0_FILES_AVAIL
102 | FATTR4_WORD0_FILES_FREE
103 | FATTR4_WORD0_FILES_TOTAL,
104 FATTR4_WORD1_SPACE_AVAIL
105 | FATTR4_WORD1_SPACE_FREE
106 | FATTR4_WORD1_SPACE_TOTAL
107};
108
4ce79717 109const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 110 FATTR4_WORD0_MAXLINK
111 | FATTR4_WORD0_MAXNAME,
112 0
113};
114
115const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
116 | FATTR4_WORD0_MAXREAD
117 | FATTR4_WORD0_MAXWRITE
118 | FATTR4_WORD0_LEASE_TIME,
119 0
120};
121
830b8e33
MN		 122const u32 nfs4_fs_locations_bitmap[2] = {
123 FATTR4_WORD0_TYPE
124 | FATTR4_WORD0_CHANGE
125 | FATTR4_WORD0_SIZE
126 | FATTR4_WORD0_FSID
127 | FATTR4_WORD0_FILEID
128 | FATTR4_WORD0_FS_LOCATIONS,
129 FATTR4_WORD1_MODE
130 | FATTR4_WORD1_NUMLINKS
131 | FATTR4_WORD1_OWNER
132 | FATTR4_WORD1_OWNER_GROUP
133 | FATTR4_WORD1_RAWDEV
134 | FATTR4_WORD1_SPACE_USED
135 | FATTR4_WORD1_TIME_ACCESS
136 | FATTR4_WORD1_TIME_METADATA
137 | FATTR4_WORD1_TIME_MODIFY
138 | FATTR4_WORD1_MOUNTED_ON_FILEID
139};
140
bc4785cd 141static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 142 struct nfs4_readdir_arg *readdir)
143{
0dbb4c67 144 __be32 *start, *p;
1da177e4
LT		 145
146 BUG_ON(readdir->count < 80);
147 if (cookie > 2) {
b7ef1956 148 readdir->cookie = cookie;
1da177e4
LT		 149 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
150 return;
151 }
152
153 readdir->cookie = 0;
154 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
155 if (cookie == 2)
156 return;
157
158 /*
159 * NFSv4 servers do not return entries for '.' and '..'
160 * Therefore, we fake these entries here. We let '.'
161 * have cookie 0 and '..' have cookie 1. Note that
162 * when talking to the server, we always send cookie 0
163 * instead of 1 or 2.
164 */
0dbb4c67 165 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 166
167 if (cookie == 0) {
168 *p++ = xdr_one; /* next */
169 *p++ = xdr_zero; /* cookie, first word */
170 *p++ = xdr_one; /* cookie, second word */
171 *p++ = xdr_one; /* entry len */
172 memcpy(p, ".\0\0\0", 4); /* entry */
173 p++;
174 *p++ = xdr_one; /* bitmap length */
175 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
176 *p++ = htonl(8); /* attribute buffer length */
4e769b93 177 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
1da177e4
LT		 178 }
179
180 *p++ = xdr_one; /* next */
181 *p++ = xdr_zero; /* cookie, first word */
182 *p++ = xdr_two; /* cookie, second word */
183 *p++ = xdr_two; /* entry len */
184 memcpy(p, "..\0\0", 4); /* entry */
185 p++;
186 *p++ = xdr_one; /* bitmap length */
187 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
188 *p++ = htonl(8); /* attribute buffer length */
4e769b93 189 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
1da177e4
LT		 190
191 readdir->pgbase = (char *)p - (char *)start;
192 readdir->count -= readdir->pgbase;
193 kunmap_atomic(start, KM_USER0);
194}
195
65de872e
TM		 196static int nfs4_wait_bit_killable(void *word)
197{
198 if (fatal_signal_pending(current))
199 return -ERESTARTSYS;
200 schedule();
201 return 0;
202}
203
204static int nfs4_wait_clnt_recover(struct nfs_client *clp)
205{
206 int res;
207
208 might_sleep();
209
e005e804 210 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
65de872e 211 nfs4_wait_bit_killable, TASK_KILLABLE);
65de872e
TM		 212 return res;
213}
214
215static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
216{
217 int res = 0;
218
219 might_sleep();
220
221 if (*timeout <= 0)
222 *timeout = NFS4_POLL_RETRY_MIN;
223 if (*timeout > NFS4_POLL_RETRY_MAX)
224 *timeout = NFS4_POLL_RETRY_MAX;
225 schedule_timeout_killable(*timeout);
226 if (fatal_signal_pending(current))
227 res = -ERESTARTSYS;
228 *timeout <<= 1;
229 return res;
230}
231
232/* This is the error handling routine for processes that are allowed
233 * to sleep.
234 */
235static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
236{
237 struct nfs_client *clp = server->nfs_client;
9e33bed5 238 struct nfs4_state *state = exception->state;
65de872e
TM		 239 int ret = errorcode;
240
241 exception->retry = 0;
242 switch(errorcode) {
243 case 0:
244 return 0;
9e33bed5
TM		 245 case -NFS4ERR_ADMIN_REVOKED:
246 case -NFS4ERR_BAD_STATEID:
247 case -NFS4ERR_OPENMODE:
248 if (state == NULL)
249 break;
250 nfs4_state_mark_reclaim_nograce(clp, state);
65de872e
TM		 251 case -NFS4ERR_STALE_CLIENTID:
252 case -NFS4ERR_STALE_STATEID:
253 case -NFS4ERR_EXPIRED:
254 nfs4_schedule_state_recovery(clp);
255 ret = nfs4_wait_clnt_recover(clp);
256 if (ret == 0)
257 exception->retry = 1;
258 break;
259 case -NFS4ERR_FILE_OPEN:
260 case -NFS4ERR_GRACE:
261 case -NFS4ERR_DELAY:
262 ret = nfs4_delay(server->client, &exception->timeout);
263 if (ret != 0)
264 break;
265 case -NFS4ERR_OLD_STATEID:
266 exception->retry = 1;
267 }
268 /* We failed to handle the error */
269 return nfs4_map_errors(ret);
270}
271
272
26e976a8 273static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 274{
7539bbab 275 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 276 spin_lock(&clp->cl_lock);
277 if (time_before(clp->cl_last_renewal,timestamp))
278 clp->cl_last_renewal = timestamp;
279 spin_unlock(&clp->cl_lock);
280}
281
38478b24 282static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 283{
38478b24 284 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 285
38478b24 286 spin_lock(&dir->i_lock);
40d24704
TM		 287 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
288 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
bfc69a45 289 nfs_force_lookup_revalidate(dir);
40d24704 290 nfsi->change_attr = cinfo->after;
38478b24 291 spin_unlock(&dir->i_lock);
1da177e4
LT		 292}
293
e56e0b78 294struct nfs4_opendata {
c6d00e63 295 struct kref kref;
e56e0b78
TM		 296 struct nfs_openargs o_arg;
297 struct nfs_openres o_res;
cdd4e68b
TM		 298 struct nfs_open_confirmargs c_arg;
299 struct nfs_open_confirmres c_res;
e56e0b78
TM		 300 struct nfs_fattr f_attr;
301 struct nfs_fattr dir_attr;
ad389da7 302 struct path path;
e56e0b78
TM		 303 struct dentry *dir;
304 struct nfs4_state_owner *owner;
aac00a8d 305 struct nfs4_state *state;
e56e0b78 306 struct iattr attrs;
26e976a8 307 unsigned long timestamp;
3e309914 308 unsigned int rpc_done : 1;
24ac23ab
TM		 309 int rpc_status;
310 int cancelled;
e56e0b78
TM		 311};
312
2ced46c2
TM		 313
314static void nfs4_init_opendata_res(struct nfs4_opendata *p)
315{
316 p->o_res.f_attr = &p->f_attr;
317 p->o_res.dir_attr = &p->dir_attr;
c1d51931
TM		 318 p->o_res.seqid = p->o_arg.seqid;
319 p->c_res.seqid = p->c_arg.seqid;
2ced46c2
TM		 320 p->o_res.server = p->o_arg.server;
321 nfs_fattr_init(&p->f_attr);
322 nfs_fattr_init(&p->dir_attr);
323}
324
ad389da7 325static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
e56e0b78
TM		 326 struct nfs4_state_owner *sp, int flags,
327 const struct iattr *attrs)
328{
ad389da7 329 struct dentry *parent = dget_parent(path->dentry);
e56e0b78
TM		 330 struct inode *dir = parent->d_inode;
331 struct nfs_server *server = NFS_SERVER(dir);
332 struct nfs4_opendata *p;
333
334 p = kzalloc(sizeof(*p), GFP_KERNEL);
335 if (p == NULL)
336 goto err;
337 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
338 if (p->o_arg.seqid == NULL)
339 goto err_free;
ad389da7
TM		 340 p->path.mnt = mntget(path->mnt);
341 p->path.dentry = dget(path->dentry);
e56e0b78
TM		 342 p->dir = parent;
343 p->owner = sp;
344 atomic_inc(&sp->so_count);
345 p->o_arg.fh = NFS_FH(dir);
346 p->o_arg.open_flags = flags,
7539bbab 347 p->o_arg.clientid = server->nfs_client->cl_clientid;
9f958ab8 348 p->o_arg.id = sp->so_owner_id.id;
ad389da7 349 p->o_arg.name = &p->path.dentry->d_name;
e56e0b78
TM		 350 p->o_arg.server = server;
351 p->o_arg.bitmask = server->attr_bitmask;
352 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
e56e0b78
TM		 353 if (flags & O_EXCL) {
354 u32 *s = (u32 *) p->o_arg.u.verifier.data;
355 s[0] = jiffies;
356 s[1] = current->pid;
357 } else if (flags & O_CREAT) {
358 p->o_arg.u.attrs = &p->attrs;
359 memcpy(&p->attrs, attrs, sizeof(p->attrs));
360 }
cdd4e68b
TM		 361 p->c_arg.fh = &p->o_res.fh;
362 p->c_arg.stateid = &p->o_res.stateid;
363 p->c_arg.seqid = p->o_arg.seqid;
2ced46c2 364 nfs4_init_opendata_res(p);
c6d00e63 365 kref_init(&p->kref);
e56e0b78
TM		 366 return p;
367err_free:
368 kfree(p);
369err:
370 dput(parent);
371 return NULL;
372}
373
c6d00e63 374static void nfs4_opendata_free(struct kref *kref)
e56e0b78 375{
c6d00e63
TM		 376 struct nfs4_opendata *p = container_of(kref,
377 struct nfs4_opendata, kref);
378
379 nfs_free_seqid(p->o_arg.seqid);
aac00a8d
TM		 380 if (p->state != NULL)
381 nfs4_put_open_state(p->state);
c6d00e63
TM		 382 nfs4_put_state_owner(p->owner);
383 dput(p->dir);
31f31db1 384 path_put(&p->path);
c6d00e63
TM		 385 kfree(p);
386}
387
388static void nfs4_opendata_put(struct nfs4_opendata *p)
389{
390 if (p != NULL)
391 kref_put(&p->kref, nfs4_opendata_free);
e56e0b78
TM		 392}
393
06f814a3
TM		 394static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
395{
06f814a3
TM		 396 int ret;
397
06f814a3 398 ret = rpc_wait_for_completion_task(task);
06f814a3
TM		 399 return ret;
400}
401
6ee41268
TM		 402static int can_open_cached(struct nfs4_state *state, int mode)
403{
404 int ret = 0;
405 switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
406 case FMODE_READ:
407 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
6ee41268
TM		 408 break;
409 case FMODE_WRITE:
410 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
6ee41268
TM		 411 break;
412 case FMODE_READ|FMODE_WRITE:
413 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
414 }
415 return ret;
416}
417
aac00a8d
TM		 418static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
419{
420 if ((delegation->type & open_flags) != open_flags)
421 return 0;
15c831bf 422 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
aac00a8d 423 return 0;
b7391f44 424 nfs_mark_delegation_referenced(delegation);
aac00a8d
TM		 425 return 1;
426}
427
003707c7 428static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
e7616923
TM		 429{
430 switch (open_flags) {
431 case FMODE_WRITE:
432 state->n_wronly++;
433 break;
434 case FMODE_READ:
435 state->n_rdonly++;
436 break;
437 case FMODE_READ|FMODE_WRITE:
438 state->n_rdwr++;
439 }
003707c7
TM		 440 nfs4_state_set_mode_locked(state, state->state | open_flags);
441}
442
443static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
444{
445 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
446 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
447 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
448 switch (open_flags) {
449 case FMODE_READ:
450 set_bit(NFS_O_RDONLY_STATE, &state->flags);
451 break;
452 case FMODE_WRITE:
453 set_bit(NFS_O_WRONLY_STATE, &state->flags);
454 break;
455 case FMODE_READ|FMODE_WRITE:
456 set_bit(NFS_O_RDWR_STATE, &state->flags);
457 }
e7616923
TM		 458}
459
003707c7
TM		 460static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
461{
8bda4e4c 462 write_seqlock(&state->seqlock);
003707c7 463 nfs_set_open_stateid_locked(state, stateid, open_flags);
8bda4e4c 464 write_sequnlock(&state->seqlock);
003707c7
TM		 465}
466
34310430 467static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, int open_flags)
1da177e4 468{
8bda4e4c
TM		 469 /*
470 * Protect the call to nfs4_state_set_mode_locked and
471 * serialise the stateid update
472 */
473 write_seqlock(&state->seqlock);
003707c7
TM		 474 if (deleg_stateid != NULL) {
475 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
476 set_bit(NFS_DELEGATED_STATE, &state->flags);
477 }
478 if (open_stateid != NULL)
479 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
8bda4e4c
TM		 480 write_sequnlock(&state->seqlock);
481 spin_lock(&state->owner->so_lock);
e7616923 482 update_open_stateflags(state, open_flags);
ec073428 483 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 484}
485
34310430
TM		 486static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, int open_flags)
487{
488 struct nfs_inode *nfsi = NFS_I(state->inode);
489 struct nfs_delegation *deleg_cur;
490 int ret = 0;
491
492 open_flags &= (FMODE_READ|FMODE_WRITE);
493
494 rcu_read_lock();
495 deleg_cur = rcu_dereference(nfsi->delegation);
496 if (deleg_cur == NULL)
497 goto no_delegation;
498
499 spin_lock(&deleg_cur->lock);
500 if (nfsi->delegation != deleg_cur ||
501 (deleg_cur->type & open_flags) != open_flags)
502 goto no_delegation_unlock;
503
504 if (delegation == NULL)
505 delegation = &deleg_cur->stateid;
506 else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
507 goto no_delegation_unlock;
508
b7391f44 509 nfs_mark_delegation_referenced(deleg_cur);
34310430
TM		 510 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, open_flags);
511 ret = 1;
512no_delegation_unlock:
513 spin_unlock(&deleg_cur->lock);
514no_delegation:
515 rcu_read_unlock();
516
517 if (!ret && open_stateid != NULL) {
518 __update_open_stateid(state, open_stateid, NULL, open_flags);
519 ret = 1;
520 }
521
522 return ret;
523}
524
525
aac00a8d
TM		 526static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
527{
528 struct nfs_delegation *delegation;
529
530 rcu_read_lock();
531 delegation = rcu_dereference(NFS_I(inode)->delegation);
532 if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
533 rcu_read_unlock();
534 return;
535 }
536 rcu_read_unlock();
537 nfs_inode_return_delegation(inode);
538}
539
6ee41268 540static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
aac00a8d
TM		 541{
542 struct nfs4_state *state = opendata->state;
543 struct nfs_inode *nfsi = NFS_I(state->inode);
544 struct nfs_delegation *delegation;
545 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
546 nfs4_stateid stateid;
547 int ret = -EAGAIN;
548
aac00a8d 549 for (;;) {
6ee41268
TM		 550 if (can_open_cached(state, open_mode)) {
551 spin_lock(&state->owner->so_lock);
552 if (can_open_cached(state, open_mode)) {
553 update_open_stateflags(state, open_mode);
554 spin_unlock(&state->owner->so_lock);
6ee41268
TM		 555 goto out_return_state;
556 }
557 spin_unlock(&state->owner->so_lock);
558 }
34310430
TM		 559 rcu_read_lock();
560 delegation = rcu_dereference(nfsi->delegation);
561 if (delegation == NULL ||
562 !can_open_delegated(delegation, open_mode)) {
563 rcu_read_unlock();
aac00a8d 564 break;
34310430 565 }
aac00a8d
TM		 566 /* Save the delegation */
567 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
568 rcu_read_unlock();
af22f94a 569 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
aac00a8d
TM		 570 if (ret != 0)
571 goto out;
572 ret = -EAGAIN;
34310430
TM		 573
574 /* Try to update the stateid using the delegation */
575 if (update_open_stateid(state, NULL, &stateid, open_mode))
576 goto out_return_state;
aac00a8d 577 }
aac00a8d
TM		 578out:
579 return ERR_PTR(ret);
580out_return_state:
581 atomic_inc(&state->count);
582 return state;
583}
584
24ac23ab
TM		 585static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
586{
587 struct inode *inode;
588 struct nfs4_state *state = NULL;
003707c7 589 struct nfs_delegation *delegation;
1b370bc2 590 int ret;
24ac23ab 591
aac00a8d 592 if (!data->rpc_done) {
6ee41268 593 state = nfs4_try_open_cached(data);
aac00a8d
TM		 594 goto out;
595 }
596
1b370bc2 597 ret = -EAGAIN;
24ac23ab 598 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1b370bc2 599 goto err;
24ac23ab 600 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1b370bc2 601 ret = PTR_ERR(inode);
03f28e3a 602 if (IS_ERR(inode))
1b370bc2
TM		 603 goto err;
604 ret = -ENOMEM;
24ac23ab
TM		 605 state = nfs4_get_open_state(inode, data->owner);
606 if (state == NULL)
1b370bc2 607 goto err_put_inode;
549d6ed5 608 if (data->o_res.delegation_type != 0) {
549d6ed5
TM		 609 int delegation_flags = 0;
610
003707c7
TM		 611 rcu_read_lock();
612 delegation = rcu_dereference(NFS_I(inode)->delegation);
613 if (delegation)
614 delegation_flags = delegation->flags;
615 rcu_read_unlock();
15c831bf 616 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
549d6ed5
TM		 617 nfs_inode_set_delegation(state->inode,
618 data->owner->so_cred,
619 &data->o_res);
620 else
621 nfs_inode_reclaim_delegation(state->inode,
622 data->owner->so_cred,
623 &data->o_res);
624 }
34310430
TM		 625
626 update_open_stateid(state, &data->o_res.stateid, NULL,
627 data->o_arg.open_flags);
24ac23ab 628 iput(inode);
aac00a8d 629out:
24ac23ab 630 return state;
1b370bc2
TM		 631err_put_inode:
632 iput(inode);
633err:
634 return ERR_PTR(ret);
24ac23ab
TM		 635}
636
864472e9
TM		 637static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
638{
639 struct nfs_inode *nfsi = NFS_I(state->inode);
640 struct nfs_open_context *ctx;
641
642 spin_lock(&state->inode->i_lock);
643 list_for_each_entry(ctx, &nfsi->open_files, list) {
644 if (ctx->state != state)
645 continue;
646 get_nfs_open_context(ctx);
647 spin_unlock(&state->inode->i_lock);
648 return ctx;
649 }
650 spin_unlock(&state->inode->i_lock);
651 return ERR_PTR(-ENOENT);
652}
653
6f220ed5
TM		 654static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
655{
656 struct nfs4_opendata *opendata;
657
658 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
659 if (opendata == NULL)
660 return ERR_PTR(-ENOMEM);
661 opendata->state = state;
662 atomic_inc(&state->count);
663 return opendata;
664}
665
2ced46c2 666static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
864472e9 667{
2ced46c2 668 struct nfs4_state *newstate;
864472e9
TM		 669 int ret;
670
671 opendata->o_arg.open_flags = openflags;
2ced46c2
TM		 672 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
673 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
674 nfs4_init_opendata_res(opendata);
864472e9
TM		 675 ret = _nfs4_proc_open(opendata);
676 if (ret != 0)
677 return ret;
2ced46c2 678 newstate = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 679 if (IS_ERR(newstate))
680 return PTR_ERR(newstate);
681 nfs4_close_state(&opendata->path, newstate, openflags);
2ced46c2 682 *res = newstate;
864472e9
TM		 683 return 0;
684}
685
686static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
687{
864472e9 688 struct nfs4_state *newstate;
864472e9
TM		 689 int ret;
690
691 /* memory barrier prior to reading state->n_* */
2ced46c2 692 clear_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9
TM		 693 smp_rmb();
694 if (state->n_rdwr != 0) {
2ced46c2 695 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
864472e9
TM		 696 if (ret != 0)
697 return ret;
2ced46c2
TM		 698 if (newstate != state)
699 return -ESTALE;
864472e9
TM		 700 }
701 if (state->n_wronly != 0) {
2ced46c2 702 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
864472e9
TM		 703 if (ret != 0)
704 return ret;
2ced46c2
TM		 705 if (newstate != state)
706 return -ESTALE;
864472e9
TM		 707 }
708 if (state->n_rdonly != 0) {
2ced46c2 709 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
864472e9
TM		 710 if (ret != 0)
711 return ret;
2ced46c2
TM		 712 if (newstate != state)
713 return -ESTALE;
864472e9 714 }
1ac7e2fd
TM		 715 /*
716 * We may have performed cached opens for all three recoveries.
717 * Check if we need to update the current stateid.
718 */
719 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
720 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
8bda4e4c 721 write_seqlock(&state->seqlock);
1ac7e2fd
TM		 722 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
723 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
8bda4e4c 724 write_sequnlock(&state->seqlock);
1ac7e2fd 725 }
864472e9
TM		 726 return 0;
727}
728
1da177e4
LT		 729/*
730 * OPEN_RECLAIM:
731 * reclaim state on the server after a reboot.
1da177e4 732 */
539cd03a 733static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 734{
1ac7e2fd 735 struct nfs_delegation *delegation;
864472e9
TM		 736 struct nfs4_opendata *opendata;
737 int delegation_type = 0;
1da177e4
LT		 738 int status;
739
6f220ed5
TM		 740 opendata = nfs4_open_recoverdata_alloc(ctx, state);
741 if (IS_ERR(opendata))
742 return PTR_ERR(opendata);
864472e9
TM		 743 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
744 opendata->o_arg.fh = NFS_FH(state->inode);
1ac7e2fd
TM		 745 rcu_read_lock();
746 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
15c831bf 747 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
65bbf6bd 748 delegation_type = delegation->type;
1ac7e2fd 749 rcu_read_unlock();
864472e9
TM		 750 opendata->o_arg.u.delegation_type = delegation_type;
751 status = nfs4_open_recover(opendata, state);
c6d00e63 752 nfs4_opendata_put(opendata);
1da177e4
LT		 753 return status;
754}
755
539cd03a 756static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 757{
758 struct nfs_server *server = NFS_SERVER(state->inode);
759 struct nfs4_exception exception = { };
760 int err;
761 do {
539cd03a 762 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 763 if (err != -NFS4ERR_DELAY)
764 break;
765 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 766 } while (exception.retry);
767 return err;
768}
769
864472e9
TM		 770static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
771{
772 struct nfs_open_context *ctx;
773 int ret;
774
775 ctx = nfs4_state_find_open_context(state);
776 if (IS_ERR(ctx))
777 return PTR_ERR(ctx);
539cd03a 778 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 779 put_nfs_open_context(ctx);
780 return ret;
781}
782
13437e12 783static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4 784{
e56e0b78 785 struct nfs4_opendata *opendata;
864472e9 786 int ret;
1da177e4 787
6f220ed5
TM		 788 opendata = nfs4_open_recoverdata_alloc(ctx, state);
789 if (IS_ERR(opendata))
790 return PTR_ERR(opendata);
e56e0b78 791 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
13437e12 792 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
e56e0b78 793 sizeof(opendata->o_arg.u.delegation.data));
864472e9 794 ret = nfs4_open_recover(opendata, state);
c6d00e63 795 nfs4_opendata_put(opendata);
864472e9 796 return ret;
1da177e4
LT		 797}
798
13437e12 799int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 800{
801 struct nfs4_exception exception = { };
539cd03a 802 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 803 int err;
804 do {
13437e12 805 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1da177e4
LT		 806 switch (err) {
807 case 0:
808 return err;
809 case -NFS4ERR_STALE_CLIENTID:
810 case -NFS4ERR_STALE_STATEID:
811 case -NFS4ERR_EXPIRED:
812 /* Don't recall a delegation if it was lost */
7539bbab 813 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 814 return err;
815 }
816 err = nfs4_handle_exception(server, err, &exception);
817 } while (exception.retry);
818 return err;
819}
820
cdd4e68b
TM		 821static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
822{
823 struct nfs4_opendata *data = calldata;
824
825 data->rpc_status = task->tk_status;
826 if (RPC_ASSASSINATED(task))
827 return;
26e976a8 828 if (data->rpc_status == 0) {
cdd4e68b
TM		 829 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
830 sizeof(data->o_res.stateid.data));
bb22629e 831 nfs_confirm_seqid(&data->owner->so_seqid, 0);
26e976a8 832 renew_lease(data->o_res.server, data->timestamp);
3e309914 833 data->rpc_done = 1;
26e976a8 834 }
cdd4e68b
TM		 835}
836
837static void nfs4_open_confirm_release(void *calldata)
838{
839 struct nfs4_opendata *data = calldata;
840 struct nfs4_state *state = NULL;
841
842 /* If this request hasn't been cancelled, do nothing */
843 if (data->cancelled == 0)
844 goto out_free;
845 /* In case of error, no cleanup! */
3e309914 846 if (!data->rpc_done)
cdd4e68b 847 goto out_free;
cdd4e68b 848 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 849 if (!IS_ERR(state))
4a35bd41 850 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 851out_free:
c6d00e63 852 nfs4_opendata_put(data);
cdd4e68b
TM		 853}
854
855static const struct rpc_call_ops nfs4_open_confirm_ops = {
cdd4e68b
TM		 856 .rpc_call_done = nfs4_open_confirm_done,
857 .rpc_release = nfs4_open_confirm_release,
858};
859
860/*
861 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
862 */
863static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
864{
865 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
866 struct rpc_task *task;
5138fde0
TM		 867 struct rpc_message msg = {
868 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
869 .rpc_argp = &data->c_arg,
870 .rpc_resp = &data->c_res,
871 .rpc_cred = data->owner->so_cred,
872 };
c970aa85
TM		 873 struct rpc_task_setup task_setup_data = {
874 .rpc_client = server->client,
5138fde0 875 .rpc_message = &msg,
c970aa85
TM		 876 .callback_ops = &nfs4_open_confirm_ops,
877 .callback_data = data,
101070ca 878 .workqueue = nfsiod_workqueue,
c970aa85
TM		 879 .flags = RPC_TASK_ASYNC,
880 };
1da177e4
LT		 881 int status;
882
c6d00e63 883 kref_get(&data->kref);
3e309914
TM		 884 data->rpc_done = 0;
885 data->rpc_status = 0;
5138fde0 886 data->timestamp = jiffies;
c970aa85 887 task = rpc_run_task(&task_setup_data);
7a1218a2 888 if (IS_ERR(task))
cdd4e68b 889 return PTR_ERR(task);
cdd4e68b
TM		 890 status = nfs4_wait_for_completion_rpc_task(task);
891 if (status != 0) {
892 data->cancelled = 1;
893 smp_wmb();
894 } else
895 status = data->rpc_status;
e6b3c4db 896 rpc_put_task(task);
1da177e4
LT		 897 return status;
898}
899
24ac23ab 900static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 901{
24ac23ab
TM		 902 struct nfs4_opendata *data = calldata;
903 struct nfs4_state_owner *sp = data->owner;
5138fde0 904
24ac23ab
TM		 905 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
906 return;
aac00a8d
TM		 907 /*
908 * Check if we still need to send an OPEN call, or if we can use
909 * a delegation instead.
910 */
911 if (data->state != NULL) {
912 struct nfs_delegation *delegation;
913
6ee41268
TM		 914 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
915 goto out_no_action;
aac00a8d
TM		 916 rcu_read_lock();
917 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
918 if (delegation != NULL &&
15c831bf 919 test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
aac00a8d 920 rcu_read_unlock();
6ee41268 921 goto out_no_action;
aac00a8d
TM		 922 }
923 rcu_read_unlock();
924 }
24ac23ab 925 /* Update sequence id. */
9f958ab8 926 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 927 data->o_arg.clientid = sp->so_client->cl_clientid;
6f220ed5 928 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
5138fde0 929 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
6f220ed5
TM		 930 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
931 }
26e976a8 932 data->timestamp = jiffies;
5138fde0 933 rpc_call_start(task);
6ee41268
TM		 934 return;
935out_no_action:
936 task->tk_action = NULL;
937
24ac23ab 938}
1da177e4 939
24ac23ab
TM		 940static void nfs4_open_done(struct rpc_task *task, void *calldata)
941{
942 struct nfs4_opendata *data = calldata;
1da177e4 943
24ac23ab
TM		 944 data->rpc_status = task->tk_status;
945 if (RPC_ASSASSINATED(task))
946 return;
947 if (task->tk_status == 0) {
948 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 949 case S_IFREG:
950 break;
951 case S_IFLNK:
24ac23ab 952 data->rpc_status = -ELOOP;
6f926b5b
TM		 953 break;
954 case S_IFDIR:
24ac23ab 955 data->rpc_status = -EISDIR;
6f926b5b
TM		 956 break;
957 default:
24ac23ab 958 data->rpc_status = -ENOTDIR;
6f926b5b 959 }
26e976a8 960 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 961 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
962 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 963 }
3e309914 964 data->rpc_done = 1;
24ac23ab 965}
6f926b5b 966
24ac23ab
TM		 967static void nfs4_open_release(void *calldata)
968{
969 struct nfs4_opendata *data = calldata;
970 struct nfs4_state *state = NULL;
971
972 /* If this request hasn't been cancelled, do nothing */
973 if (data->cancelled == 0)
974 goto out_free;
975 /* In case of error, no cleanup! */
3e309914 976 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 977 goto out_free;
978 /* In case we need an open_confirm, no cleanup! */
979 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
980 goto out_free;
24ac23ab 981 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 982 if (!IS_ERR(state))
4a35bd41 983 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 984out_free:
c6d00e63 985 nfs4_opendata_put(data);
24ac23ab
TM		 986}
987
988static const struct rpc_call_ops nfs4_open_ops = {
989 .rpc_call_prepare = nfs4_open_prepare,
990 .rpc_call_done = nfs4_open_done,
991 .rpc_release = nfs4_open_release,
992};
993
994/*
995 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
996 */
997static int _nfs4_proc_open(struct nfs4_opendata *data)
998{
999 struct inode *dir = data->dir->d_inode;
1000 struct nfs_server *server = NFS_SERVER(dir);
1001 struct nfs_openargs *o_arg = &data->o_arg;
1002 struct nfs_openres *o_res = &data->o_res;
1003 struct rpc_task *task;
5138fde0
TM		 1004 struct rpc_message msg = {
1005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1006 .rpc_argp = o_arg,
1007 .rpc_resp = o_res,
1008 .rpc_cred = data->owner->so_cred,
1009 };
c970aa85
TM		 1010 struct rpc_task_setup task_setup_data = {
1011 .rpc_client = server->client,
5138fde0 1012 .rpc_message = &msg,
c970aa85
TM		 1013 .callback_ops = &nfs4_open_ops,
1014 .callback_data = data,
101070ca 1015 .workqueue = nfsiod_workqueue,
c970aa85
TM		 1016 .flags = RPC_TASK_ASYNC,
1017 };
24ac23ab
TM		 1018 int status;
1019
c6d00e63 1020 kref_get(&data->kref);
3e309914
TM		 1021 data->rpc_done = 0;
1022 data->rpc_status = 0;
2ced46c2 1023 data->cancelled = 0;
c970aa85 1024 task = rpc_run_task(&task_setup_data);
7a1218a2 1025 if (IS_ERR(task))
24ac23ab 1026 return PTR_ERR(task);
24ac23ab
TM		 1027 status = nfs4_wait_for_completion_rpc_task(task);
1028 if (status != 0) {
1029 data->cancelled = 1;
1030 smp_wmb();
1031 } else
1032 status = data->rpc_status;
e6b3c4db 1033 rpc_put_task(task);
3e309914 1034 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 1035 return status;
1036
9936781d
TM		 1037 if (o_res->fh.size == 0)
1038 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1039
56ae19f3
TM		 1040 if (o_arg->open_flags & O_CREAT) {
1041 update_changeattr(dir, &o_res->cinfo);
1042 nfs_post_op_update_inode(dir, o_res->dir_attr);
1043 } else
1044 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 1045 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 1046 status = _nfs4_proc_open_confirm(data);
1da177e4 1047 if (status != 0)
24ac23ab 1048 return status;
1da177e4
LT		 1049 }
1050 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
9936781d 1051 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 1052 return 0;
1da177e4
LT		 1053}
1054
10afec90 1055static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 1056{
7539bbab 1057 struct nfs_client *clp = server->nfs_client;
6b30954e 1058 int ret;
58d9714a 1059
6b30954e 1060 for (;;) {
65de872e 1061 ret = nfs4_wait_clnt_recover(clp);
6b30954e
TM		 1062 if (ret != 0)
1063 return ret;
e598d843
TM		 1064 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1065 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
6b30954e 1066 break;
58d9714a 1067 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 1068 }
1069 return 0;
58d9714a
TM		 1070}
1071
1da177e4
LT		 1072/*
1073 * OPEN_EXPIRED:
1074 * reclaim state on the server after a network partition.
1075 * Assumes caller holds the appropriate lock
1076 */
539cd03a 1077static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 1078{
e56e0b78 1079 struct nfs4_opendata *opendata;
864472e9 1080 int ret;
1da177e4 1081
6f220ed5
TM		 1082 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1083 if (IS_ERR(opendata))
1084 return PTR_ERR(opendata);
864472e9 1085 ret = nfs4_open_recover(opendata, state);
35d05778 1086 if (ret == -ESTALE)
539cd03a 1087 d_drop(ctx->path.dentry);
c6d00e63 1088 nfs4_opendata_put(opendata);
864472e9 1089 return ret;
1da177e4
LT		 1090}
1091
539cd03a 1092static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 1093{
539cd03a 1094 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 1095 struct nfs4_exception exception = { };
1096 int err;
1097
1098 do {
539cd03a 1099 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 1100 if (err == -NFS4ERR_DELAY)
1101 nfs4_handle_exception(server, err, &exception);
1102 } while (exception.retry);
1103 return err;
1104}
1105
1da177e4
LT		 1106static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1107{
1da177e4 1108 struct nfs_open_context *ctx;
864472e9 1109 int ret;
1da177e4 1110
864472e9
TM		 1111 ctx = nfs4_state_find_open_context(state);
1112 if (IS_ERR(ctx))
1113 return PTR_ERR(ctx);
539cd03a 1114 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1115 put_nfs_open_context(ctx);
1116 return ret;
1da177e4
LT		 1117}
1118
aa53ed54
JL		 1119/*
1120 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1121 * fields corresponding to attributes that were used to store the verifier.
1122 * Make sure we clobber those fields in the later setattr call
1123 */
1124static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1125{
1126 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1127 !(sattr->ia_valid & ATTR_ATIME_SET))
1128 sattr->ia_valid |= ATTR_ATIME;
1129
1130 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1131 !(sattr->ia_valid & ATTR_MTIME_SET))
1132 sattr->ia_valid |= ATTR_MTIME;
1133}
1134
1da177e4 1135/*
24ac23ab 1136 * Returns a referenced nfs4_state
1da177e4 1137 */
ad389da7 1138static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1da177e4
LT		 1139{
1140 struct nfs4_state_owner *sp;
1141 struct nfs4_state *state = NULL;
1142 struct nfs_server *server = NFS_SERVER(dir);
e56e0b78 1143 struct nfs4_opendata *opendata;
aac00a8d 1144 int status;
1da177e4
LT		 1145
1146 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1147 status = -ENOMEM;
1148 if (!(sp = nfs4_get_state_owner(server, cred))) {
1149 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1150 goto out_err;
1151 }
58d9714a
TM		 1152 status = nfs4_recover_expired_lease(server);
1153 if (status != 0)
b4454fe1 1154 goto err_put_state_owner;
aac00a8d
TM		 1155 if (path->dentry->d_inode != NULL)
1156 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a 1157 status = -ENOMEM;
ad389da7 1158 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1159 if (opendata == NULL)
95d35cb4 1160 goto err_put_state_owner;
1da177e4 1161
aac00a8d
TM		 1162 if (path->dentry->d_inode != NULL)
1163 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1164
24ac23ab 1165 status = _nfs4_proc_open(opendata);
1da177e4 1166 if (status != 0)
c6d00e63 1167 goto err_opendata_put;
1da177e4 1168
aa53ed54
JL		 1169 if (opendata->o_arg.open_flags & O_EXCL)
1170 nfs4_exclusive_attrset(opendata, sattr);
1171
24ac23ab 1172 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1173 status = PTR_ERR(state);
1174 if (IS_ERR(state))
c6d00e63 1175 goto err_opendata_put;
c6d00e63 1176 nfs4_opendata_put(opendata);
1da177e4 1177 nfs4_put_state_owner(sp);
1da177e4
LT		 1178 *res = state;
1179 return 0;
c6d00e63
TM		 1180err_opendata_put:
1181 nfs4_opendata_put(opendata);
e56e0b78
TM		 1182err_put_state_owner:
1183 nfs4_put_state_owner(sp);
1da177e4 1184out_err:
1da177e4
LT		 1185 *res = NULL;
1186 return status;
1187}
1188
1189
ad389da7 1190static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1191{
1192 struct nfs4_exception exception = { };
1193 struct nfs4_state *res;
1194 int status;
1195
1196 do {
ad389da7 1197 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1198 if (status == 0)
1199 break;
1200 /* NOTE: BAD_SEQID means the server and client disagree about the
1201 * book-keeping w.r.t. state-changing operations
1202 * (OPEN/CLOSE/LOCK/LOCKU...)
1203 * It is actually a sign of a bug on the client or on the server.
1204 *
1205 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1206 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1207 * have unhashed the old state_owner for us, and that we can
1208 * therefore safely retry using a new one. We should still warn
1209 * the user though...
1210 */
1211 if (status == -NFS4ERR_BAD_SEQID) {
6f43ddcc
TM		 1212 printk(KERN_WARNING "NFS: v4 server %s "
1213 " returned a bad sequence-id error!\n",
1214 NFS_SERVER(dir)->nfs_client->cl_hostname);
1da177e4
LT		 1215 exception.retry = 1;
1216 continue;
1217 }
550f5747
TM		 1218 /*
1219 * BAD_STATEID on OPEN means that the server cancelled our
1220 * state before it received the OPEN_CONFIRM.
1221 * Recover by retrying the request as per the discussion
1222 * on Page 181 of RFC3530.
1223 */
1224 if (status == -NFS4ERR_BAD_STATEID) {
1225 exception.retry = 1;
1226 continue;
1227 }
aac00a8d
TM		 1228 if (status == -EAGAIN) {
1229 /* We must have found a delegation */
1230 exception.retry = 1;
1231 continue;
1232 }
1da177e4
LT		 1233 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1234 status, &exception));
1235 } while (exception.retry);
1236 return res;
1237}
1238
659bfcd6
TM		 1239static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1240 struct nfs_fattr *fattr, struct iattr *sattr,
1241 struct nfs4_state *state)
1da177e4 1242{
3e4f6290 1243 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1244 struct nfs_setattrargs arg = {
3e4f6290 1245 .fh = NFS_FH(inode),
1da177e4
LT		 1246 .iap = sattr,
1247 .server = server,
1248 .bitmask = server->attr_bitmask,
1249 };
1250 struct nfs_setattrres res = {
1251 .fattr = fattr,
1252 .server = server,
1253 };
1254 struct rpc_message msg = {
659bfcd6
TM		 1255 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1256 .rpc_argp = &arg,
1257 .rpc_resp = &res,
1258 .rpc_cred = cred,
1da177e4 1259 };
26e976a8 1260 unsigned long timestamp = jiffies;
65e4308d 1261 int status;
1da177e4 1262
0e574af1 1263 nfs_fattr_init(fattr);
1da177e4 1264
3e4f6290
TM		 1265 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1266 /* Use that stateid */
1267 } else if (state != NULL) {
08e9eac4
TM		 1268 nfs4_copy_stateid(&arg.stateid, state, current->files);
1269 } else
1da177e4
LT		 1270 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1271
65e4308d 1272 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1273 if (status == 0 && state != NULL)
1274 renew_lease(server, timestamp);
65e4308d 1275 return status;
1da177e4
LT		 1276}
1277
659bfcd6
TM		 1278static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1279 struct nfs_fattr *fattr, struct iattr *sattr,
1280 struct nfs4_state *state)
1da177e4 1281{
3e4f6290 1282 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1283 struct nfs4_exception exception = { };
1284 int err;
1285 do {
1286 err = nfs4_handle_exception(server,
659bfcd6 1287 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1da177e4
LT		 1288 &exception);
1289 } while (exception.retry);
1290 return err;
1291}
1292
1293struct nfs4_closedata {
4a35bd41 1294 struct path path;
1da177e4
LT		 1295 struct inode *inode;
1296 struct nfs4_state *state;
1297 struct nfs_closeargs arg;
1298 struct nfs_closeres res;
516a6af6 1299 struct nfs_fattr fattr;
26e976a8 1300 unsigned long timestamp;
1da177e4
LT		 1301};
1302
963d8fe5 1303static void nfs4_free_closedata(void *data)
9512135d 1304{
963d8fe5
TM		 1305 struct nfs4_closedata *calldata = data;
1306 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1307
1308 nfs4_put_open_state(calldata->state);
1309 nfs_free_seqid(calldata->arg.seqid);
9512135d 1310 nfs4_put_state_owner(sp);
31f31db1 1311 path_put(&calldata->path);
9512135d
TM		 1312 kfree(calldata);
1313}
1314
963d8fe5 1315static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1316{
963d8fe5 1317 struct nfs4_closedata *calldata = data;
1da177e4 1318 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1319 struct nfs_server *server = NFS_SERVER(calldata->inode);
1320
4ce70ada
TM		 1321 if (RPC_ASSASSINATED(task))
1322 return;
1da177e4
LT		 1323 /* hmm. we are done with the inode, and in the process of freeing
1324 * the state_owner. we keep this around to process errors
1325 */
1da177e4
LT		 1326 switch (task->tk_status) {
1327 case 0:
45328c35 1328 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
26e976a8 1329 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1330 break;
1331 case -NFS4ERR_STALE_STATEID:
9e33bed5
TM		 1332 case -NFS4ERR_OLD_STATEID:
1333 case -NFS4ERR_BAD_STATEID:
1da177e4 1334 case -NFS4ERR_EXPIRED:
9e33bed5
TM		 1335 if (calldata->arg.open_flags == 0)
1336 break;
1da177e4 1337 default:
9e33bed5 1338 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1da177e4
LT		 1339 rpc_restart_call(task);
1340 return;
1341 }
1342 }
516a6af6 1343 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1344}
1345
4ce70ada 1346static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1347{
4ce70ada 1348 struct nfs4_closedata *calldata = data;
9512135d 1349 struct nfs4_state *state = calldata->state;
003707c7 1350 int clear_rd, clear_wr, clear_rdwr;
9512135d 1351
963d8fe5 1352 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1353 return;
003707c7 1354
003707c7 1355 clear_rd = clear_wr = clear_rdwr = 0;
4cecb76f 1356 spin_lock(&state->owner->so_lock);
003707c7 1357 /* Calculate the change in open mode */
e7616923 1358 if (state->n_rdwr == 0) {
003707c7 1359 if (state->n_rdonly == 0) {
003707c7
TM		 1360 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1361 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1362 }
1363 if (state->n_wronly == 0) {
003707c7
TM		 1364 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1365 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1366 }
e7616923 1367 }
4cecb76f 1368 spin_unlock(&state->owner->so_lock);
003707c7 1369 if (!clear_rd && !clear_wr && !clear_rdwr) {
963d8fe5
TM		 1370 /* Note: exit _without_ calling nfs4_close_done */
1371 task->tk_action = NULL;
9512135d
TM		 1372 return;
1373 }
516a6af6 1374 nfs_fattr_init(calldata->res.fattr);
45328c35 1375 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
5138fde0 1376 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1377 calldata->arg.open_flags = FMODE_READ;
1378 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
5138fde0 1379 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1380 calldata->arg.open_flags = FMODE_WRITE;
1381 }
26e976a8 1382 calldata->timestamp = jiffies;
5138fde0 1383 rpc_call_start(task);
1da177e4
LT		 1384}
1385
963d8fe5 1386static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1387 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1388 .rpc_call_done = nfs4_close_done,
1389 .rpc_release = nfs4_free_closedata,
1390};
1391
1da177e4
LT		 1392/*
1393 * It is possible for data to be read/written from a mem-mapped file
1394 * after the sys_close call (which hits the vfs layer as a flush).
1395 * This means that we can't safely call nfsv4 close on a file until
1396 * the inode is cleared. This in turn means that we are not good
1397 * NFSv4 citizens - we do not indicate to the server to update the file's
1398 * share state even when we are done with one of the three share
1399 * stateid's in the inode.
1400 *
1401 * NOTE: Caller must be holding the sp->so_owner semaphore!
1402 */
a49c3c77 1403int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1da177e4 1404{
4a35bd41 1405 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4 1406 struct nfs4_closedata *calldata;
b39e625b
TM		 1407 struct nfs4_state_owner *sp = state->owner;
1408 struct rpc_task *task;
5138fde0
TM		 1409 struct rpc_message msg = {
1410 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1411 .rpc_cred = state->owner->so_cred,
1412 };
c970aa85
TM		 1413 struct rpc_task_setup task_setup_data = {
1414 .rpc_client = server->client,
5138fde0 1415 .rpc_message = &msg,
c970aa85 1416 .callback_ops = &nfs4_close_ops,
101070ca 1417 .workqueue = nfsiod_workqueue,
c970aa85
TM		 1418 .flags = RPC_TASK_ASYNC,
1419 };
9512135d 1420 int status = -ENOMEM;
1da177e4 1421
9512135d 1422 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1423 if (calldata == NULL)
9512135d 1424 goto out;
4a35bd41 1425 calldata->inode = state->inode;
1da177e4 1426 calldata->state = state;
4a35bd41 1427 calldata->arg.fh = NFS_FH(state->inode);
003707c7 1428 calldata->arg.stateid = &state->open_stateid;
1da177e4 1429 /* Serialization for the sequence id */
cee54fc9 1430 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1431 if (calldata->arg.seqid == NULL)
1432 goto out_free_calldata;
9e33bed5 1433 calldata->arg.open_flags = 0;
516a6af6
TM		 1434 calldata->arg.bitmask = server->attr_bitmask;
1435 calldata->res.fattr = &calldata->fattr;
c1d51931 1436 calldata->res.seqid = calldata->arg.seqid;
516a6af6 1437 calldata->res.server = server;
4a35bd41
TM		 1438 calldata->path.mnt = mntget(path->mnt);
1439 calldata->path.dentry = dget(path->dentry);
9512135d 1440
5138fde0
TM		 1441 msg.rpc_argp = &calldata->arg,
1442 msg.rpc_resp = &calldata->res,
c970aa85
TM		 1443 task_setup_data.callback_data = calldata;
1444 task = rpc_run_task(&task_setup_data);
b39e625b
TM		 1445 if (IS_ERR(task))
1446 return PTR_ERR(task);
a49c3c77
TM		 1447 status = 0;
1448 if (wait)
1449 status = rpc_wait_for_completion_task(task);
b39e625b 1450 rpc_put_task(task);
a49c3c77 1451 return status;
9512135d
TM		 1452out_free_calldata:
1453 kfree(calldata);
1454out:
b39e625b
TM		 1455 nfs4_put_open_state(state);
1456 nfs4_put_state_owner(sp);
9512135d 1457 return status;
1da177e4
LT		 1458}
1459
4a35bd41 1460static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
02a913a7
TM		 1461{
1462 struct file *filp;
1b45c46c 1463 int ret;
02a913a7 1464
1b45c46c
TM		 1465 /* If the open_intent is for execute, we have an extra check to make */
1466 if (nd->intent.open.flags & FMODE_EXEC) {
af22f94a 1467 ret = nfs_may_open(state->inode,
1b45c46c
TM		 1468 state->owner->so_cred,
1469 nd->intent.open.flags);
1470 if (ret < 0)
1471 goto out_close;
1472 }
4a35bd41 1473 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
02a913a7
TM		 1474 if (!IS_ERR(filp)) {
1475 struct nfs_open_context *ctx;
cd3758e3 1476 ctx = nfs_file_open_context(filp);
02a913a7 1477 ctx->state = state;
95cf959b
TM		 1478 return 0;
1479 }
1b45c46c
TM		 1480 ret = PTR_ERR(filp);
1481out_close:
a49c3c77 1482 nfs4_close_sync(path, state, nd->intent.open.flags);
1b45c46c 1483 return ret;
02a913a7
TM		 1484}
1485
1486struct dentry *
1da177e4
LT		 1487nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1488{
ad389da7 1489 struct path path = {
4ac91378 1490 .mnt = nd->path.mnt,
ad389da7
TM		 1491 .dentry = dentry,
1492 };
4ac91378 1493 struct dentry *parent;
1da177e4
LT		 1494 struct iattr attr;
1495 struct rpc_cred *cred;
1496 struct nfs4_state *state;
02a913a7 1497 struct dentry *res;
1da177e4
LT		 1498
1499 if (nd->flags & LOOKUP_CREATE) {
1500 attr.ia_mode = nd->intent.open.create_mode;
1501 attr.ia_valid = ATTR_MODE;
1502 if (!IS_POSIXACL(dir))
1503 attr.ia_mode &= ~current->fs->umask;
1504 } else {
1505 attr.ia_valid = 0;
1506 BUG_ON(nd->intent.open.flags & O_CREAT);
1507 }
1508
98a8e323 1509 cred = rpc_lookup_cred();
1da177e4 1510 if (IS_ERR(cred))
02a913a7 1511 return (struct dentry *)cred;
565277f6
TM		 1512 parent = dentry->d_parent;
1513 /* Protect against concurrent sillydeletes */
1514 nfs_block_sillyrename(parent);
ad389da7 1515 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1516 put_rpccred(cred);
02a913a7 1517 if (IS_ERR(state)) {
d75340cc 1518 if (PTR_ERR(state) == -ENOENT) {
02a913a7 1519 d_add(dentry, NULL);
d75340cc
TM		 1520 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1521 }
565277f6 1522 nfs_unblock_sillyrename(parent);
02a913a7
TM		 1523 return (struct dentry *)state;
1524 }
24ac23ab 1525 res = d_add_unique(dentry, igrab(state->inode));
02a913a7 1526 if (res != NULL)
deee9369 1527 path.dentry = res;
d75340cc 1528 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
565277f6 1529 nfs_unblock_sillyrename(parent);
4a35bd41 1530 nfs4_intent_set_file(nd, &path, state);
02a913a7 1531 return res;
1da177e4
LT		 1532}
1533
1534int
02a913a7 1535nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1536{
ad389da7 1537 struct path path = {
4ac91378 1538 .mnt = nd->path.mnt,
ad389da7
TM		 1539 .dentry = dentry,
1540 };
1da177e4
LT		 1541 struct rpc_cred *cred;
1542 struct nfs4_state *state;
1da177e4 1543
98a8e323 1544 cred = rpc_lookup_cred();
1da177e4
LT		 1545 if (IS_ERR(cred))
1546 return PTR_ERR(cred);
aac00a8d 1547 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1548 put_rpccred(cred);
02a913a7
TM		 1549 if (IS_ERR(state)) {
1550 switch (PTR_ERR(state)) {
1551 case -EPERM:
1552 case -EACCES:
1553 case -EDQUOT:
1554 case -ENOSPC:
1555 case -EROFS:
1556 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1557 return 1;
b87c0adf
CL		 1558 default:
1559 goto out_drop;
02a913a7 1560 }
02a913a7 1561 }
24ac23ab 1562 if (state->inode == dentry->d_inode) {
d75340cc 1563 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
4a35bd41 1564 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1565 return 1;
1566 }
a49c3c77 1567 nfs4_close_sync(&path, state, openflags);
02a913a7
TM		 1568out_drop:
1569 d_drop(dentry);
1da177e4
LT		 1570 return 0;
1571}
1572
1573
1574static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1575{
1576 struct nfs4_server_caps_res res = {};
1577 struct rpc_message msg = {
1578 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1579 .rpc_argp = fhandle,
1580 .rpc_resp = &res,
1581 };
1582 int status;
1583
1584 status = rpc_call_sync(server->client, &msg, 0);
1585 if (status == 0) {
1586 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1587 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1588 server->caps |= NFS_CAP_ACLS;
1589 if (res.has_links != 0)
1590 server->caps |= NFS_CAP_HARDLINKS;
1591 if (res.has_symlinks != 0)
1592 server->caps |= NFS_CAP_SYMLINKS;
1593 server->acl_bitmask = res.acl_bitmask;
1594 }
1595 return status;
1596}
1597
55a97593 1598int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1599{
1600 struct nfs4_exception exception = { };
1601 int err;
1602 do {
1603 err = nfs4_handle_exception(server,
1604 _nfs4_server_capabilities(server, fhandle),
1605 &exception);
1606 } while (exception.retry);
1607 return err;
1608}
1609
1610static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1611 struct nfs_fsinfo *info)
1612{
1da177e4
LT		 1613 struct nfs4_lookup_root_arg args = {
1614 .bitmask = nfs4_fattr_bitmap,
1615 };
1616 struct nfs4_lookup_res res = {
1617 .server = server,
0e574af1 1618 .fattr = info->fattr,
1da177e4
LT		 1619 .fh = fhandle,
1620 };
1621 struct rpc_message msg = {
1622 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1623 .rpc_argp = &args,
1624 .rpc_resp = &res,
1625 };
0e574af1 1626 nfs_fattr_init(info->fattr);
1da177e4
LT		 1627 return rpc_call_sync(server->client, &msg, 0);
1628}
1629
1630static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1631 struct nfs_fsinfo *info)
1632{
1633 struct nfs4_exception exception = { };
1634 int err;
1635 do {
1636 err = nfs4_handle_exception(server,
1637 _nfs4_lookup_root(server, fhandle, info),
1638 &exception);
1639 } while (exception.retry);
1640 return err;
1641}
1642
54ceac45
DH		 1643/*
1644 * get the file handle for the "/" directory on the server
1645 */
1da177e4 1646static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1647 struct nfs_fsinfo *info)
1da177e4 1648{
1da177e4
LT		 1649 int status;
1650
1da177e4 1651 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1652 if (status == 0)
1653 status = nfs4_server_capabilities(server, fhandle);
1654 if (status == 0)
1655 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1656 return nfs4_map_errors(status);
1da177e4
LT		 1657}
1658
6b97fd3d
MN		 1659/*
1660 * Get locations and (maybe) other attributes of a referral.
1661 * Note that we'll actually follow the referral later when
1662 * we detect fsid mismatch in inode revalidation
1663 */
56659e99 1664static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
6b97fd3d
MN		 1665{
1666 int status = -ENOMEM;
1667 struct page *page = NULL;
1668 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1669
1670 page = alloc_page(GFP_KERNEL);
1671 if (page == NULL)
1672 goto out;
1673 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1674 if (locations == NULL)
1675 goto out;
1676
c228fd3a 1677 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1678 if (status != 0)
1679 goto out;
1680 /* Make sure server returned a different fsid for the referral */
1681 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3110ff80 1682 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
6b97fd3d
MN		 1683 status = -EIO;
1684 goto out;
1685 }
1686
1687 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1688 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1689 if (!fattr->mode)
1690 fattr->mode = S_IFDIR;
1691 memset(fhandle, 0, sizeof(struct nfs_fh));
1692out:
1693 if (page)
1694 __free_page(page);
1695 if (locations)
1696 kfree(locations);
1697 return status;
1698}
1699
1da177e4
LT		 1700static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1701{
1702 struct nfs4_getattr_arg args = {
1703 .fh = fhandle,
1704 .bitmask = server->attr_bitmask,
1705 };
1706 struct nfs4_getattr_res res = {
1707 .fattr = fattr,
1708 .server = server,
1709 };
1710 struct rpc_message msg = {
1711 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1712 .rpc_argp = &args,
1713 .rpc_resp = &res,
1714 };
1715
0e574af1 1716 nfs_fattr_init(fattr);
1da177e4
LT		 1717 return rpc_call_sync(server->client, &msg, 0);
1718}
1719
1720static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1721{
1722 struct nfs4_exception exception = { };
1723 int err;
1724 do {
1725 err = nfs4_handle_exception(server,
1726 _nfs4_proc_getattr(server, fhandle, fattr),
1727 &exception);
1728 } while (exception.retry);
1729 return err;
1730}
1731
1732/*
1733 * The file is not closed if it is opened due to the a request to change
1734 * the size of the file. The open call will not be needed once the
1735 * VFS layer lookup-intents are implemented.
1736 *
1737 * Close is called when the inode is destroyed.
1738 * If we haven't opened the file for O_WRONLY, we
1739 * need to in the size_change case to obtain a stateid.
1740 *
1741 * Got race?
1742 * Because OPEN is always done by name in nfsv4, it is
1743 * possible that we opened a different file by the same
1744 * name. We can recognize this race condition, but we
1745 * can't do anything about it besides returning an error.
1746 *
1747 * This will be fixed with VFS changes (lookup-intent).
1748 */
1749static int
1750nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1751 struct iattr *sattr)
1752{
08e9eac4 1753 struct inode *inode = dentry->d_inode;
659bfcd6 1754 struct rpc_cred *cred = NULL;
d530838b 1755 struct nfs4_state *state = NULL;
1da177e4
LT		 1756 int status;
1757
0e574af1 1758 nfs_fattr_init(fattr);
1da177e4 1759
d530838b 1760 /* Search for an existing open(O_WRITE) file */
659bfcd6
TM		 1761 if (sattr->ia_valid & ATTR_FILE) {
1762 struct nfs_open_context *ctx;
1763
1764 ctx = nfs_file_open_context(sattr->ia_file);
504e5189
NB		 1765 if (ctx) {
1766 cred = ctx->cred;
1767 state = ctx->state;
1768 }
659bfcd6 1769 }
08e9eac4 1770
659bfcd6 1771 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
65e4308d
TM		 1772 if (status == 0)
1773 nfs_setattr_update_inode(inode, sattr);
1da177e4
LT		 1774 return status;
1775}
1776
56659e99
TM		 1777static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1778 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1779 struct nfs_fattr *fattr)
1780{
1781 int status;
1782 struct nfs4_lookup_arg args = {
1783 .bitmask = server->attr_bitmask,
1784 .dir_fh = dirfh,
1785 .name = name,
1786 };
1787 struct nfs4_lookup_res res = {
1788 .server = server,
1789 .fattr = fattr,
1790 .fh = fhandle,
1791 };
1792 struct rpc_message msg = {
1793 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1794 .rpc_argp = &args,
1795 .rpc_resp = &res,
1796 };
1797
1798 nfs_fattr_init(fattr);
1799
1800 dprintk("NFS call lookupfh %s\n", name->name);
1801 status = rpc_call_sync(server->client, &msg, 0);
1802 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1803 return status;
1804}
1805
1806static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1807 struct qstr *name, struct nfs_fh *fhandle,
1808 struct nfs_fattr *fattr)
1809{
1810 struct nfs4_exception exception = { };
1811 int err;
1812 do {
4e56e082
TM		 1813 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1814 /* FIXME: !!!! */
1815 if (err == -NFS4ERR_MOVED) {
1816 err = -EREMOTE;
1817 break;
1818 }
1819 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1820 } while (exception.retry);
1821 return err;
1822}
1823
56659e99 1824static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1825 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1826{
4e56e082 1827 int status;
1da177e4
LT		 1828
1829 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1830 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1831 if (status == -NFS4ERR_MOVED)
1832 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1833 dprintk("NFS reply lookup: %d\n", status);
1834 return status;
1835}
1836
1837static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1838{
1839 struct nfs4_exception exception = { };
1840 int err;
1841 do {
1842 err = nfs4_handle_exception(NFS_SERVER(dir),
1843 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1844 &exception);
1845 } while (exception.retry);
1846 return err;
1847}
1848
1849static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1850{
76b32999
TM		 1851 struct nfs_server *server = NFS_SERVER(inode);
1852 struct nfs_fattr fattr;
1da177e4
LT		 1853 struct nfs4_accessargs args = {
1854 .fh = NFS_FH(inode),
76b32999
TM		 1855 .bitmask = server->attr_bitmask,
1856 };
1857 struct nfs4_accessres res = {
1858 .server = server,
1859 .fattr = &fattr,
1da177e4 1860 };
1da177e4
LT		 1861 struct rpc_message msg = {
1862 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1863 .rpc_argp = &args,
1864 .rpc_resp = &res,
1865 .rpc_cred = entry->cred,
1866 };
1867 int mode = entry->mask;
1868 int status;
1869
1870 /*
1871 * Determine which access bits we want to ask for...
1872 */
1873 if (mode & MAY_READ)
1874 args.access |= NFS4_ACCESS_READ;
1875 if (S_ISDIR(inode->i_mode)) {
1876 if (mode & MAY_WRITE)
1877 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1878 if (mode & MAY_EXEC)
1879 args.access |= NFS4_ACCESS_LOOKUP;
1880 } else {
1881 if (mode & MAY_WRITE)
1882 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1883 if (mode & MAY_EXEC)
1884 args.access |= NFS4_ACCESS_EXECUTE;
1885 }
76b32999 1886 nfs_fattr_init(&fattr);
1da177e4
LT		 1887 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1888 if (!status) {
1889 entry->mask = 0;
1890 if (res.access & NFS4_ACCESS_READ)
1891 entry->mask |= MAY_READ;
1892 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1893 entry->mask |= MAY_WRITE;
1894 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1895 entry->mask |= MAY_EXEC;
76b32999 1896 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1897 }
1898 return status;
1899}
1900
1901static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1902{
1903 struct nfs4_exception exception = { };
1904 int err;
1905 do {
1906 err = nfs4_handle_exception(NFS_SERVER(inode),
1907 _nfs4_proc_access(inode, entry),
1908 &exception);
1909 } while (exception.retry);
1910 return err;
1911}
1912
1913/*
1914 * TODO: For the time being, we don't try to get any attributes
1915 * along with any of the zero-copy operations READ, READDIR,
1916 * READLINK, WRITE.
1917 *
1918 * In the case of the first three, we want to put the GETATTR
1919 * after the read-type operation -- this is because it is hard
1920 * to predict the length of a GETATTR response in v4, and thus
1921 * align the READ data correctly. This means that the GETATTR
1922 * may end up partially falling into the page cache, and we should
1923 * shift it into the 'tail' of the xdr_buf before processing.
1924 * To do this efficiently, we need to know the total length
1925 * of data received, which doesn't seem to be available outside
1926 * of the RPC layer.
1927 *
1928 * In the case of WRITE, we also want to put the GETATTR after
1929 * the operation -- in this case because we want to make sure
1930 * we get the post-operation mtime and size. This means that
1931 * we can't use xdr_encode_pages() as written: we need a variant
1932 * of it which would leave room in the 'tail' iovec.
1933 *
1934 * Both of these changes to the XDR layer would in fact be quite
1935 * minor, but I decided to leave them for a subsequent patch.
1936 */
1937static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1938 unsigned int pgbase, unsigned int pglen)
1939{
1940 struct nfs4_readlink args = {
1941 .fh = NFS_FH(inode),
1942 .pgbase = pgbase,
1943 .pglen = pglen,
1944 .pages = &page,
1945 };
1946 struct rpc_message msg = {
1947 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1948 .rpc_argp = &args,
1949 .rpc_resp = NULL,
1950 };
1951
1952 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1953}
1954
1955static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1956 unsigned int pgbase, unsigned int pglen)
1957{
1958 struct nfs4_exception exception = { };
1959 int err;
1960 do {
1961 err = nfs4_handle_exception(NFS_SERVER(inode),
1962 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1963 &exception);
1964 } while (exception.retry);
1965 return err;
1966}
1967
1da177e4
LT		 1968/*
1969 * Got race?
1970 * We will need to arrange for the VFS layer to provide an atomic open.
1971 * Until then, this create/open method is prone to inefficiency and race
1972 * conditions due to the lookup, create, and open VFS calls from sys_open()
1973 * placed on the wire.
1974 *
1975 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1976 * The file will be opened again in the subsequent VFS open call
1977 * (nfs4_proc_file_open).
1978 *
1979 * The open for read will just hang around to be used by any process that
1980 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1981 */
1982
1983static int
1984nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1985 int flags, struct nameidata *nd)
1da177e4 1986{
ad389da7 1987 struct path path = {
4ac91378 1988 .mnt = nd->path.mnt,
ad389da7
TM		 1989 .dentry = dentry,
1990 };
1da177e4
LT		 1991 struct nfs4_state *state;
1992 struct rpc_cred *cred;
1993 int status = 0;
1994
98a8e323 1995 cred = rpc_lookup_cred();
1da177e4
LT		 1996 if (IS_ERR(cred)) {
1997 status = PTR_ERR(cred);
1998 goto out;
1999 }
ad389da7 2000 state = nfs4_do_open(dir, &path, flags, sattr, cred);
d4d9cdcb 2001 d_drop(dentry);
1da177e4
LT		 2002 if (IS_ERR(state)) {
2003 status = PTR_ERR(state);
659bfcd6 2004 goto out_putcred;
1da177e4 2005 }
d4d9cdcb 2006 d_add(dentry, igrab(state->inode));
d75340cc 2007 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 2008 if (flags & O_EXCL) {
2009 struct nfs_fattr fattr;
659bfcd6 2010 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
02a913a7 2011 if (status == 0)
65e4308d 2012 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 2013 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 2014 }
ad389da7 2015 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 2016 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 2017 else
a49c3c77 2018 nfs4_close_sync(&path, state, flags);
659bfcd6
TM		 2019out_putcred:
2020 put_rpccred(cred);
1da177e4
LT		 2021out:
2022 return status;
2023}
2024
2025static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2026{
16e42959 2027 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 2028 struct nfs_removeargs args = {
1da177e4 2029 .fh = NFS_FH(dir),
4fdc17b2
TM		 2030 .name.len = name->len,
2031 .name.name = name->name,
16e42959
TM		 2032 .bitmask = server->attr_bitmask,
2033 };
4fdc17b2 2034 struct nfs_removeres res = {
16e42959 2035 .server = server,
1da177e4 2036 };
1da177e4 2037 struct rpc_message msg = {
4fdc17b2
TM		 2038 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2039 .rpc_argp = &args,
2040 .rpc_resp = &res,
1da177e4
LT		 2041 };
2042 int status;
2043
4fdc17b2 2044 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 2045 status = rpc_call_sync(server->client, &msg, 0);
2046 if (status == 0) {
2047 update_changeattr(dir, &res.cinfo);
4fdc17b2 2048 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 2049 }
1da177e4
LT		 2050 return status;
2051}
2052
2053static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2054{
2055 struct nfs4_exception exception = { };
2056 int err;
2057 do {
2058 err = nfs4_handle_exception(NFS_SERVER(dir),
2059 _nfs4_proc_remove(dir, name),
2060 &exception);
2061 } while (exception.retry);
2062 return err;
2063}
2064
e4eff1a6 2065static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 2066{
e4eff1a6
TM		 2067 struct nfs_server *server = NFS_SERVER(dir);
2068 struct nfs_removeargs *args = msg->rpc_argp;
2069 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 2070
e4eff1a6
TM		 2071 args->bitmask = server->attr_bitmask;
2072 res->server = server;
1da177e4 2073 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 2074}
2075
e4eff1a6 2076static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 2077{
e4eff1a6
TM		 2078 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2079
9e33bed5 2080 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
e4eff1a6
TM		 2081 return 0;
2082 update_changeattr(dir, &res->cinfo);
2083 nfs_post_op_update_inode(dir, &res->dir_attr);
2084 return 1;
1da177e4
LT		 2085}
2086
2087static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2088 struct inode *new_dir, struct qstr *new_name)
2089{
6caf2c82 2090 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 2091 struct nfs4_rename_arg arg = {
2092 .old_dir = NFS_FH(old_dir),
2093 .new_dir = NFS_FH(new_dir),
2094 .old_name = old_name,
2095 .new_name = new_name,
6caf2c82
TM		 2096 .bitmask = server->attr_bitmask,
2097 };
2098 struct nfs_fattr old_fattr, new_fattr;
2099 struct nfs4_rename_res res = {
2100 .server = server,
2101 .old_fattr = &old_fattr,
2102 .new_fattr = &new_fattr,
1da177e4 2103 };
1da177e4
LT		 2104 struct rpc_message msg = {
2105 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2106 .rpc_argp = &arg,
2107 .rpc_resp = &res,
2108 };
2109 int status;
2110
6caf2c82
TM		 2111 nfs_fattr_init(res.old_fattr);
2112 nfs_fattr_init(res.new_fattr);
2113 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2114
2115 if (!status) {
2116 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2117 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2118 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2119 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2120 }
2121 return status;
2122}
2123
2124static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2125 struct inode *new_dir, struct qstr *new_name)
2126{
2127 struct nfs4_exception exception = { };
2128 int err;
2129 do {
2130 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2131 _nfs4_proc_rename(old_dir, old_name,
2132 new_dir, new_name),
2133 &exception);
2134 } while (exception.retry);
2135 return err;
2136}
2137
2138static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2139{
91ba2eee 2140 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2141 struct nfs4_link_arg arg = {
2142 .fh = NFS_FH(inode),
2143 .dir_fh = NFS_FH(dir),
2144 .name = name,
91ba2eee
TM		 2145 .bitmask = server->attr_bitmask,
2146 };
2147 struct nfs_fattr fattr, dir_attr;
2148 struct nfs4_link_res res = {
2149 .server = server,
2150 .fattr = &fattr,
2151 .dir_attr = &dir_attr,
1da177e4 2152 };
1da177e4
LT		 2153 struct rpc_message msg = {
2154 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2155 .rpc_argp = &arg,
91ba2eee 2156 .rpc_resp = &res,
1da177e4
LT		 2157 };
2158 int status;
2159
91ba2eee
TM		 2160 nfs_fattr_init(res.fattr);
2161 nfs_fattr_init(res.dir_attr);
2162 status = rpc_call_sync(server->client, &msg, 0);
2163 if (!status) {
2164 update_changeattr(dir, &res.cinfo);
2165 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2166 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2167 }
1da177e4
LT		 2168
2169 return status;
2170}
2171
2172static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2173{
2174 struct nfs4_exception exception = { };
2175 int err;
2176 do {
2177 err = nfs4_handle_exception(NFS_SERVER(inode),
2178 _nfs4_proc_link(inode, dir, name),
2179 &exception);
2180 } while (exception.retry);
2181 return err;
2182}
2183
57dc9a57
TM		 2184struct nfs4_createdata {
2185 struct rpc_message msg;
2186 struct nfs4_create_arg arg;
2187 struct nfs4_create_res res;
2188 struct nfs_fh fh;
2189 struct nfs_fattr fattr;
2190 struct nfs_fattr dir_fattr;
2191};
2192
2193static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2194 struct qstr *name, struct iattr *sattr, u32 ftype)
2195{
2196 struct nfs4_createdata *data;
2197
2198 data = kzalloc(sizeof(*data), GFP_KERNEL);
2199 if (data != NULL) {
2200 struct nfs_server *server = NFS_SERVER(dir);
2201
2202 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2203 data->msg.rpc_argp = &data->arg;
2204 data->msg.rpc_resp = &data->res;
2205 data->arg.dir_fh = NFS_FH(dir);
2206 data->arg.server = server;
2207 data->arg.name = name;
2208 data->arg.attrs = sattr;
2209 data->arg.ftype = ftype;
2210 data->arg.bitmask = server->attr_bitmask;
2211 data->res.server = server;
2212 data->res.fh = &data->fh;
2213 data->res.fattr = &data->fattr;
2214 data->res.dir_fattr = &data->dir_fattr;
2215 nfs_fattr_init(data->res.fattr);
2216 nfs_fattr_init(data->res.dir_fattr);
2217 }
2218 return data;
2219}
2220
2221static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2222{
2223 int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2224 if (status == 0) {
2225 update_changeattr(dir, &data->res.dir_cinfo);
2226 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2227 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2228 }
2229 return status;
2230}
2231
2232static void nfs4_free_createdata(struct nfs4_createdata *data)
2233{
2234 kfree(data);
2235}
2236
4f390c15 2237static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2238 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4 2239{
57dc9a57
TM		 2240 struct nfs4_createdata *data;
2241 int status = -ENAMETOOLONG;
1da177e4 2242
94a6d753 2243 if (len > NFS4_MAXPATHLEN)
57dc9a57 2244 goto out;
4f390c15 2245
57dc9a57
TM		 2246 status = -ENOMEM;
2247 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2248 if (data == NULL)
2249 goto out;
2250
2251 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2252 data->arg.u.symlink.pages = &page;
2253 data->arg.u.symlink.len = len;
1da177e4 2254
57dc9a57
TM		 2255 status = nfs4_do_create(dir, dentry, data);
2256
2257 nfs4_free_createdata(data);
2258out:
1da177e4
LT		 2259 return status;
2260}
2261
4f390c15 2262static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2263 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2264{
2265 struct nfs4_exception exception = { };
2266 int err;
2267 do {
2268 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2269 _nfs4_proc_symlink(dir, dentry, page,
2270 len, sattr),
1da177e4
LT		 2271 &exception);
2272 } while (exception.retry);
2273 return err;
2274}
2275
2276static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2277 struct iattr *sattr)
2278{
57dc9a57
TM		 2279 struct nfs4_createdata *data;
2280 int status = -ENOMEM;
1da177e4 2281
57dc9a57
TM		 2282 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2283 if (data == NULL)
2284 goto out;
2285
2286 status = nfs4_do_create(dir, dentry, data);
2287
2288 nfs4_free_createdata(data);
2289out:
1da177e4
LT		 2290 return status;
2291}
2292
2293static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2294 struct iattr *sattr)
2295{
2296 struct nfs4_exception exception = { };
2297 int err;
2298 do {
2299 err = nfs4_handle_exception(NFS_SERVER(dir),
2300 _nfs4_proc_mkdir(dir, dentry, sattr),
2301 &exception);
2302 } while (exception.retry);
2303 return err;
2304}
2305
2306static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2307 u64 cookie, struct page *page, unsigned int count, int plus)
2308{
2309 struct inode *dir = dentry->d_inode;
2310 struct nfs4_readdir_arg args = {
2311 .fh = NFS_FH(dir),
2312 .pages = &page,
2313 .pgbase = 0,
2314 .count = count,
2315 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2316 };
2317 struct nfs4_readdir_res res;
2318 struct rpc_message msg = {
2319 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2320 .rpc_argp = &args,
2321 .rpc_resp = &res,
2322 .rpc_cred = cred,
2323 };
2324 int status;
2325
3110ff80 2326 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
eadf4598
TM		 2327 dentry->d_parent->d_name.name,
2328 dentry->d_name.name,
2329 (unsigned long long)cookie);
1da177e4
LT		 2330 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2331 res.pgbase = args.pgbase;
2332 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2333 if (status == 0)
2334 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2335
2336 nfs_invalidate_atime(dir);
2337
3110ff80 2338 dprintk("%s: returns %d\n", __func__, status);
1da177e4
LT		 2339 return status;
2340}
2341
2342static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2343 u64 cookie, struct page *page, unsigned int count, int plus)
2344{
2345 struct nfs4_exception exception = { };
2346 int err;
2347 do {
2348 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2349 _nfs4_proc_readdir(dentry, cred, cookie,
2350 page, count, plus),
2351 &exception);
2352 } while (exception.retry);
2353 return err;
2354}
2355
2356static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2357 struct iattr *sattr, dev_t rdev)
2358{
57dc9a57
TM		 2359 struct nfs4_createdata *data;
2360 int mode = sattr->ia_mode;
2361 int status = -ENOMEM;
1da177e4
LT		 2362
2363 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2364 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
57dc9a57
TM		 2365
2366 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2367 if (data == NULL)
2368 goto out;
2369
1da177e4 2370 if (S_ISFIFO(mode))
57dc9a57 2371 data->arg.ftype = NF4FIFO;
1da177e4 2372 else if (S_ISBLK(mode)) {
57dc9a57
TM		 2373 data->arg.ftype = NF4BLK;
2374 data->arg.u.device.specdata1 = MAJOR(rdev);
2375 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4
LT		 2376 }
2377 else if (S_ISCHR(mode)) {
57dc9a57
TM		 2378 data->arg.ftype = NF4CHR;
2379 data->arg.u.device.specdata1 = MAJOR(rdev);
2380 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4 2381 }
1da177e4 2382
57dc9a57
TM		 2383 status = nfs4_do_create(dir, dentry, data);
2384
2385 nfs4_free_createdata(data);
2386out:
1da177e4
LT		 2387 return status;
2388}
2389
2390static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2391 struct iattr *sattr, dev_t rdev)
2392{
2393 struct nfs4_exception exception = { };
2394 int err;
2395 do {
2396 err = nfs4_handle_exception(NFS_SERVER(dir),
2397 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2398 &exception);
2399 } while (exception.retry);
2400 return err;
2401}
2402
2403static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2404 struct nfs_fsstat *fsstat)
2405{
2406 struct nfs4_statfs_arg args = {
2407 .fh = fhandle,
2408 .bitmask = server->attr_bitmask,
2409 };
2410 struct rpc_message msg = {
2411 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2412 .rpc_argp = &args,
2413 .rpc_resp = fsstat,
2414 };
2415
0e574af1 2416 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2417 return rpc_call_sync(server->client, &msg, 0);
2418}
2419
2420static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2421{
2422 struct nfs4_exception exception = { };
2423 int err;
2424 do {
2425 err = nfs4_handle_exception(server,
2426 _nfs4_proc_statfs(server, fhandle, fsstat),
2427 &exception);
2428 } while (exception.retry);
2429 return err;
2430}
2431
2432static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2433 struct nfs_fsinfo *fsinfo)
2434{
2435 struct nfs4_fsinfo_arg args = {
2436 .fh = fhandle,
2437 .bitmask = server->attr_bitmask,
2438 };
2439 struct rpc_message msg = {
2440 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2441 .rpc_argp = &args,
2442 .rpc_resp = fsinfo,
2443 };
2444
2445 return rpc_call_sync(server->client, &msg, 0);
2446}
2447
2448static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2449{
2450 struct nfs4_exception exception = { };
2451 int err;
2452
2453 do {
2454 err = nfs4_handle_exception(server,
2455 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2456 &exception);
2457 } while (exception.retry);
2458 return err;
2459}
2460
2461static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2462{
0e574af1 2463 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2464 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2465}
2466
2467static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2468 struct nfs_pathconf *pathconf)
2469{
2470 struct nfs4_pathconf_arg args = {
2471 .fh = fhandle,
2472 .bitmask = server->attr_bitmask,
2473 };
2474 struct rpc_message msg = {
2475 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2476 .rpc_argp = &args,
2477 .rpc_resp = pathconf,
2478 };
2479
2480 /* None of the pathconf attributes are mandatory to implement */
2481 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2482 memset(pathconf, 0, sizeof(*pathconf));
2483 return 0;
2484 }
2485
0e574af1 2486 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2487 return rpc_call_sync(server->client, &msg, 0);
2488}
2489
2490static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2491 struct nfs_pathconf *pathconf)
2492{
2493 struct nfs4_exception exception = { };
2494 int err;
2495
2496 do {
2497 err = nfs4_handle_exception(server,
2498 _nfs4_proc_pathconf(server, fhandle, pathconf),
2499 &exception);
2500 } while (exception.retry);
2501 return err;
2502}
2503
ec06c096 2504static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2505{
ec06c096 2506 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2507
9e33bed5 2508 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
1da177e4 2509 rpc_restart_call(task);
ec06c096 2510 return -EAGAIN;
1da177e4 2511 }
8850df99
TM		 2512
2513 nfs_invalidate_atime(data->inode);
1da177e4 2514 if (task->tk_status > 0)
ec06c096
TM		 2515 renew_lease(server, data->timestamp);
2516 return 0;
1da177e4
LT		 2517}
2518
bdc7f021 2519static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
1da177e4 2520{
1da177e4 2521 data->timestamp = jiffies;
bdc7f021 2522 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
1da177e4
LT		 2523}
2524
788e7a89 2525static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2526{
1da177e4
LT		 2527 struct inode *inode = data->inode;
2528
9e33bed5 2529 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
1da177e4 2530 rpc_restart_call(task);
788e7a89 2531 return -EAGAIN;
1da177e4 2532 }
4f9838c7 2533 if (task->tk_status >= 0) {
1da177e4 2534 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2535 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2536 }
788e7a89 2537 return 0;
1da177e4
LT		 2538}
2539
bdc7f021 2540static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2541{
bdc7f021
TM		 2542 struct nfs_server *server = NFS_SERVER(data->inode);
2543
4f9838c7
TM		 2544 data->args.bitmask = server->attr_bitmask;
2545 data->res.server = server;
1da177e4
LT		 2546 data->timestamp = jiffies;
2547
bdc7f021 2548 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
1da177e4
LT		 2549}
2550
788e7a89 2551static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2552{
1da177e4
LT		 2553 struct inode *inode = data->inode;
2554
9e33bed5 2555 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
1da177e4 2556 rpc_restart_call(task);
788e7a89 2557 return -EAGAIN;
1da177e4 2558 }
9e08a3c5 2559 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2560 return 0;
1da177e4
LT		 2561}
2562
bdc7f021 2563static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2564{
788e7a89 2565 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2566
4f9838c7
TM		 2567 data->args.bitmask = server->attr_bitmask;
2568 data->res.server = server;
bdc7f021 2569 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
1da177e4
LT		 2570}
2571
2572/*
2573 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2574 * standalone procedure for queueing an asynchronous RENEW.
2575 */
963d8fe5 2576static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2577{
adfa6f98 2578 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2579 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2580
2581 if (task->tk_status < 0) {
2582 switch (task->tk_status) {
2583 case -NFS4ERR_STALE_CLIENTID:
2584 case -NFS4ERR_EXPIRED:
2585 case -NFS4ERR_CB_PATH_DOWN:
2586 nfs4_schedule_state_recovery(clp);
2587 }
2588 return;
2589 }
2590 spin_lock(&clp->cl_lock);
2591 if (time_before(clp->cl_last_renewal,timestamp))
2592 clp->cl_last_renewal = timestamp;
2593 spin_unlock(&clp->cl_lock);
2594}
2595
963d8fe5
TM		 2596static const struct rpc_call_ops nfs4_renew_ops = {
2597 .rpc_call_done = nfs4_renew_done,
2598};
2599
adfa6f98 2600int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2601{
2602 struct rpc_message msg = {
2603 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2604 .rpc_argp = clp,
b4454fe1 2605 .rpc_cred = cred,
1da177e4
LT		 2606 };
2607
2608 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2609 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2610}
2611
adfa6f98 2612int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2613{
2614 struct rpc_message msg = {
2615 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2616 .rpc_argp = clp,
b4454fe1 2617 .rpc_cred = cred,
1da177e4
LT		 2618 };
2619 unsigned long now = jiffies;
2620 int status;
2621
2622 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2623 if (status < 0)
2624 return status;
2625 spin_lock(&clp->cl_lock);
2626 if (time_before(clp->cl_last_renewal,now))
2627 clp->cl_last_renewal = now;
2628 spin_unlock(&clp->cl_lock);
2629 return 0;
2630}
2631
aa1870af
BF		 2632static inline int nfs4_server_supports_acls(struct nfs_server *server)
2633{
2634 return (server->caps & NFS_CAP_ACLS)
2635 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2636 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2637}
2638
2639/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2640 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2641 * the stack.
2642 */
2643#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2644
2645static void buf_to_pages(const void *buf, size_t buflen,
2646 struct page **pages, unsigned int *pgbase)
2647{
2648 const void *p = buf;
2649
2650 *pgbase = offset_in_page(buf);
2651 p -= *pgbase;
2652 while (p < buf + buflen) {
2653 *(pages++) = virt_to_page(p);
2654 p += PAGE_CACHE_SIZE;
2655 }
2656}
2657
e50a1c2e
BF		 2658struct nfs4_cached_acl {
2659 int cached;
2660 size_t len;
3e9d4154 2661 char data[0];
e50a1c2e
BF		 2662};
2663
2664static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2665{
2666 struct nfs_inode *nfsi = NFS_I(inode);
2667
2668 spin_lock(&inode->i_lock);
2669 kfree(nfsi->nfs4_acl);
2670 nfsi->nfs4_acl = acl;
2671 spin_unlock(&inode->i_lock);
2672}
2673
2674static void nfs4_zap_acl_attr(struct inode *inode)
2675{
2676 nfs4_set_cached_acl(inode, NULL);
2677}
2678
2679static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2680{
2681 struct nfs_inode *nfsi = NFS_I(inode);
2682 struct nfs4_cached_acl *acl;
2683 int ret = -ENOENT;
2684
2685 spin_lock(&inode->i_lock);
2686 acl = nfsi->nfs4_acl;
2687 if (acl == NULL)
2688 goto out;
2689 if (buf == NULL) /* user is just asking for length */
2690 goto out_len;
2691 if (acl->cached == 0)
2692 goto out;
2693 ret = -ERANGE; /* see getxattr(2) man page */
2694 if (acl->len > buflen)
2695 goto out;
2696 memcpy(buf, acl->data, acl->len);
2697out_len:
2698 ret = acl->len;
2699out:
2700 spin_unlock(&inode->i_lock);
2701 return ret;
2702}
2703
2704static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2705{
2706 struct nfs4_cached_acl *acl;
2707
2708 if (buf && acl_len <= PAGE_SIZE) {
2709 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2710 if (acl == NULL)
2711 goto out;
2712 acl->cached = 1;
2713 memcpy(acl->data, buf, acl_len);
2714 } else {
2715 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2716 if (acl == NULL)
2717 goto out;
2718 acl->cached = 0;
2719 }
2720 acl->len = acl_len;
2721out:
2722 nfs4_set_cached_acl(inode, acl);
2723}
2724
16b4289c 2725static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2726{
aa1870af
BF		 2727 struct page *pages[NFS4ACL_MAXPAGES];
2728 struct nfs_getaclargs args = {
2729 .fh = NFS_FH(inode),
2730 .acl_pages = pages,
2731 .acl_len = buflen,
2732 };
2733 size_t resp_len = buflen;
e50a1c2e 2734 void *resp_buf;
aa1870af
BF		 2735 struct rpc_message msg = {
2736 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2737 .rpc_argp = &args,
2738 .rpc_resp = &resp_len,
2739 };
e50a1c2e 2740 struct page *localpage = NULL;
aa1870af
BF		 2741 int ret;
2742
e50a1c2e
BF		 2743 if (buflen < PAGE_SIZE) {
2744 /* As long as we're doing a round trip to the server anyway,
2745 * let's be prepared for a page of acl data. */
2746 localpage = alloc_page(GFP_KERNEL);
2747 resp_buf = page_address(localpage);
2748 if (localpage == NULL)
2749 return -ENOMEM;
2750 args.acl_pages[0] = localpage;
2751 args.acl_pgbase = 0;
1d95db8e 2752 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2753 } else {
2754 resp_buf = buf;
2755 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2756 }
aa1870af 2757 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2758 if (ret)
2759 goto out_free;
2760 if (resp_len > args.acl_len)
2761 nfs4_write_cached_acl(inode, NULL, resp_len);
2762 else
2763 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2764 if (buf) {
2765 ret = -ERANGE;
2766 if (resp_len > buflen)
2767 goto out_free;
2768 if (localpage)
2769 memcpy(buf, resp_buf, resp_len);
2770 }
2771 ret = resp_len;
2772out_free:
2773 if (localpage)
2774 __free_page(localpage);
aa1870af
BF		 2775 return ret;
2776}
2777
16b4289c
TM		 2778static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2779{
2780 struct nfs4_exception exception = { };
2781 ssize_t ret;
2782 do {
2783 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2784 if (ret >= 0)
2785 break;
2786 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2787 } while (exception.retry);
2788 return ret;
2789}
2790
e50a1c2e
BF		 2791static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2792{
2793 struct nfs_server *server = NFS_SERVER(inode);
2794 int ret;
2795
2796 if (!nfs4_server_supports_acls(server))
2797 return -EOPNOTSUPP;
2798 ret = nfs_revalidate_inode(server, inode);
2799 if (ret < 0)
2800 return ret;
f41f7418
TM		 2801 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2802 nfs_zap_acl_cache(inode);
e50a1c2e
BF		 2803 ret = nfs4_read_cached_acl(inode, buf, buflen);
2804 if (ret != -ENOENT)
2805 return ret;
2806 return nfs4_get_acl_uncached(inode, buf, buflen);
2807}
2808
16b4289c 2809static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2810{
2811 struct nfs_server *server = NFS_SERVER(inode);
2812 struct page *pages[NFS4ACL_MAXPAGES];
2813 struct nfs_setaclargs arg = {
2814 .fh = NFS_FH(inode),
2815 .acl_pages = pages,
2816 .acl_len = buflen,
2817 };
2818 struct rpc_message msg = {
2819 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2820 .rpc_argp = &arg,
2821 .rpc_resp = NULL,
2822 };
2823 int ret;
2824
2825 if (!nfs4_server_supports_acls(server))
2826 return -EOPNOTSUPP;
642ac549 2827 nfs_inode_return_delegation(inode);
4b580ee3 2828 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2829 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
f41f7418
TM		 2830 nfs_access_zap_cache(inode);
2831 nfs_zap_acl_cache(inode);
4b580ee3
BF		 2832 return ret;
2833}
2834
16b4289c
TM		 2835static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2836{
2837 struct nfs4_exception exception = { };
2838 int err;
2839 do {
2840 err = nfs4_handle_exception(NFS_SERVER(inode),
2841 __nfs4_proc_set_acl(inode, buf, buflen),
2842 &exception);
2843 } while (exception.retry);
2844 return err;
2845}
2846
1da177e4 2847static int
9e33bed5 2848nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
1da177e4 2849{
7539bbab 2850 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2851
2852 if (!clp || task->tk_status >= 0)
2853 return 0;
2854 switch(task->tk_status) {
9e33bed5
TM		 2855 case -NFS4ERR_ADMIN_REVOKED:
2856 case -NFS4ERR_BAD_STATEID:
2857 case -NFS4ERR_OPENMODE:
2858 if (state == NULL)
2859 break;
2860 nfs4_state_mark_reclaim_nograce(clp, state);
1da177e4
LT		 2861 case -NFS4ERR_STALE_CLIENTID:
2862 case -NFS4ERR_STALE_STATEID:
2863 case -NFS4ERR_EXPIRED:
5d00837b 2864 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
1da177e4 2865 nfs4_schedule_state_recovery(clp);
e005e804 2866 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
fda13939 2867 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
1da177e4
LT		 2868 task->tk_status = 0;
2869 return -EAGAIN;
1da177e4 2870 case -NFS4ERR_DELAY:
2e96d286 2871 nfs_inc_server_stats(server, NFSIOS_DELAY);
006ea73e 2872 case -NFS4ERR_GRACE:
1da177e4
LT		 2873 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2874 task->tk_status = 0;
2875 return -EAGAIN;
2876 case -NFS4ERR_OLD_STATEID:
2877 task->tk_status = 0;
2878 return -EAGAIN;
2879 }
2880 task->tk_status = nfs4_map_errors(task->tk_status);
2881 return 0;
2882}
2883
adfa6f98 2884int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2885{
2886 nfs4_verifier sc_verifier;
2887 struct nfs4_setclientid setclientid = {
2888 .sc_verifier = &sc_verifier,
2889 .sc_prog = program,
2890 };
2891 struct rpc_message msg = {
2892 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2893 .rpc_argp = &setclientid,
2894 .rpc_resp = clp,
286d7d6a 2895 .rpc_cred = cred,
1da177e4 2896 };
bc4785cd 2897 __be32 *p;
1da177e4
LT		 2898 int loop = 0;
2899 int status;
2900
bc4785cd 2901 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2902 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2903 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2904
2905 for(;;) {
2906 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
69dd716c 2907 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
d4d3c507
CL		 2908 clp->cl_ipaddr,
2909 rpc_peeraddr2str(clp->cl_rpcclient,
2910 RPC_DISPLAY_ADDR),
69dd716c
TM		 2911 rpc_peeraddr2str(clp->cl_rpcclient,
2912 RPC_DISPLAY_PROTO),
78ea323b 2913 clp->cl_rpcclient->cl_auth->au_ops->au_name,
1da177e4
LT		 2914 clp->cl_id_uniquifier);
2915 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
d4d3c507
CL		 2916 sizeof(setclientid.sc_netid),
2917 rpc_peeraddr2str(clp->cl_rpcclient,
2918 RPC_DISPLAY_NETID));
1da177e4 2919 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
d4d3c507 2920 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
1da177e4
LT		 2921 clp->cl_ipaddr, port >> 8, port & 255);
2922
2923 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2924 if (status != -NFS4ERR_CLID_INUSE)
2925 break;
2926 if (signalled())
2927 break;
2928 if (loop++ & 1)
2929 ssleep(clp->cl_lease_time + 1);
2930 else
2931 if (++clp->cl_id_uniquifier == 0)
2932 break;
2933 }
2934 return status;
2935}
2936
adfa6f98 2937static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2938{
2939 struct nfs_fsinfo fsinfo;
2940 struct rpc_message msg = {
2941 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2942 .rpc_argp = clp,
2943 .rpc_resp = &fsinfo,
286d7d6a 2944 .rpc_cred = cred,
1da177e4
LT		 2945 };
2946 unsigned long now;
2947 int status;
2948
2949 now = jiffies;
2950 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2951 if (status == 0) {
2952 spin_lock(&clp->cl_lock);
2953 clp->cl_lease_time = fsinfo.lease_time * HZ;
2954 clp->cl_last_renewal = now;
2955 spin_unlock(&clp->cl_lock);
2956 }
2957 return status;
2958}
2959
adfa6f98 2960int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b 2961{
77e03677 2962 long timeout = 0;
51581f3b
TM		 2963 int err;
2964 do {
2965 err = _nfs4_proc_setclientid_confirm(clp, cred);
2966 switch (err) {
2967 case 0:
2968 return err;
2969 case -NFS4ERR_RESOURCE:
2970 /* The IBM lawyers misread another document! */
2971 case -NFS4ERR_DELAY:
2972 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2973 }
2974 } while (err == 0);
2975 return err;
2976}
2977
fe650407
TM		 2978struct nfs4_delegreturndata {
2979 struct nfs4_delegreturnargs args;
fa178f29 2980 struct nfs4_delegreturnres res;
fe650407
TM		 2981 struct nfs_fh fh;
2982 nfs4_stateid stateid;
26e976a8 2983 unsigned long timestamp;
fa178f29 2984 struct nfs_fattr fattr;
fe650407
TM		 2985 int rpc_status;
2986};
2987
fe650407
TM		 2988static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2989{
2990 struct nfs4_delegreturndata *data = calldata;
2991 data->rpc_status = task->tk_status;
26e976a8 2992 if (data->rpc_status == 0)
fa178f29 2993 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2994}
2995
2996static void nfs4_delegreturn_release(void *calldata)
2997{
fe650407
TM		 2998 kfree(calldata);
2999}
3000
c8d149f3 3001static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 3002 .rpc_call_done = nfs4_delegreturn_done,
3003 .rpc_release = nfs4_delegreturn_release,
3004};
3005
e6f81075 3006static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
fe650407
TM		 3007{
3008 struct nfs4_delegreturndata *data;
fa178f29 3009 struct nfs_server *server = NFS_SERVER(inode);
fe650407 3010 struct rpc_task *task;
5138fde0
TM		 3011 struct rpc_message msg = {
3012 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3013 .rpc_cred = cred,
3014 };
c970aa85
TM		 3015 struct rpc_task_setup task_setup_data = {
3016 .rpc_client = server->client,
5138fde0 3017 .rpc_message = &msg,
c970aa85
TM		 3018 .callback_ops = &nfs4_delegreturn_ops,
3019 .flags = RPC_TASK_ASYNC,
3020 };
e6f81075 3021 int status = 0;
fe650407
TM		 3022
3023 data = kmalloc(sizeof(*data), GFP_KERNEL);
3024 if (data == NULL)
3025 return -ENOMEM;
3026 data->args.fhandle = &data->fh;
3027 data->args.stateid = &data->stateid;
fa178f29 3028 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3029 nfs_copy_fh(&data->fh, NFS_FH(inode));
3030 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3031 data->res.fattr = &data->fattr;
3032 data->res.server = server;
5138fde0 3033 nfs_fattr_init(data->res.fattr);
26e976a8 3034 data->timestamp = jiffies;
fe650407
TM		 3035 data->rpc_status = 0;
3036
c970aa85 3037 task_setup_data.callback_data = data;
5138fde0
TM		 3038 msg.rpc_argp = &data->args,
3039 msg.rpc_resp = &data->res,
c970aa85 3040 task = rpc_run_task(&task_setup_data);
7a1218a2 3041 if (IS_ERR(task))
fe650407 3042 return PTR_ERR(task);
e6f81075
TM		 3043 if (!issync)
3044 goto out;
fe650407 3045 status = nfs4_wait_for_completion_rpc_task(task);
e6f81075
TM		 3046 if (status != 0)
3047 goto out;
3048 status = data->rpc_status;
3049 if (status != 0)
3050 goto out;
3051 nfs_refresh_inode(inode, &data->fattr);
3052out:
e6b3c4db 3053 rpc_put_task(task);
fe650407 3054 return status;
1da177e4
LT		 3055}
3056
e6f81075 3057int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
1da177e4
LT		 3058{
3059 struct nfs_server *server = NFS_SERVER(inode);
3060 struct nfs4_exception exception = { };
3061 int err;
3062 do {
e6f81075 3063 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
1da177e4
LT		 3064 switch (err) {
3065 case -NFS4ERR_STALE_STATEID:
3066 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3067 case 0:
3068 return 0;
3069 }
3070 err = nfs4_handle_exception(server, err, &exception);
3071 } while (exception.retry);
3072 return err;
3073}
3074
3075#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3076#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3077
3078/*
3079 * sleep, with exponential backoff, and retry the LOCK operation.
3080 */
3081static unsigned long
3082nfs4_set_lock_task_retry(unsigned long timeout)
3083{
150030b7 3084 schedule_timeout_killable(timeout);
1da177e4
LT		 3085 timeout <<= 1;
3086 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3087 return NFS4_LOCK_MAXTIMEOUT;
3088 return timeout;
3089}
3090
1da177e4
LT		 3091static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3092{
3093 struct inode *inode = state->inode;
3094 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3095 struct nfs_client *clp = server->nfs_client;
911d1aaf 3096 struct nfs_lockt_args arg = {
1da177e4 3097 .fh = NFS_FH(inode),
911d1aaf 3098 .fl = request,
1da177e4 3099 };
911d1aaf
TM		 3100 struct nfs_lockt_res res = {
3101 .denied = request,
1da177e4
LT		 3102 };
3103 struct rpc_message msg = {
3104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3105 .rpc_argp = &arg,
3106 .rpc_resp = &res,
3107 .rpc_cred = state->owner->so_cred,
3108 };
1da177e4
LT		 3109 struct nfs4_lock_state *lsp;
3110 int status;
3111
911d1aaf 3112 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3113 status = nfs4_set_lock_state(state, request);
3114 if (status != 0)
3115 goto out;
3116 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3117 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3118 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3119 switch (status) {
3120 case 0:
3121 request->fl_type = F_UNLCK;
3122 break;
3123 case -NFS4ERR_DENIED:
3124 status = 0;
1da177e4 3125 }
70cc6487 3126 request->fl_ops->fl_release_private(request);
8d0a8a9d 3127out:
1da177e4
LT		 3128 return status;
3129}
3130
3131static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3132{
3133 struct nfs4_exception exception = { };
3134 int err;
3135
3136 do {
3137 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3138 _nfs4_proc_getlk(state, cmd, request),
3139 &exception);
3140 } while (exception.retry);
3141 return err;
3142}
3143
3144static int do_vfs_lock(struct file *file, struct file_lock *fl)
3145{
3146 int res = 0;
3147 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3148 case FL_POSIX:
3149 res = posix_lock_file_wait(file, fl);
3150 break;
3151 case FL_FLOCK:
3152 res = flock_lock_file_wait(file, fl);
3153 break;
3154 default:
3155 BUG();
3156 }
1da177e4
LT		 3157 return res;
3158}
3159
faf5f49c 3160struct nfs4_unlockdata {
911d1aaf
TM		 3161 struct nfs_locku_args arg;
3162 struct nfs_locku_res res;
faf5f49c
TM		 3163 struct nfs4_lock_state *lsp;
3164 struct nfs_open_context *ctx;
911d1aaf
TM		 3165 struct file_lock fl;
3166 const struct nfs_server *server;
26e976a8 3167 unsigned long timestamp;
faf5f49c
TM		 3168};
3169
911d1aaf
TM		 3170static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3171 struct nfs_open_context *ctx,
3172 struct nfs4_lock_state *lsp,
3173 struct nfs_seqid *seqid)
3174{
3175 struct nfs4_unlockdata *p;
3176 struct inode *inode = lsp->ls_state->inode;
3177
3178 p = kmalloc(sizeof(*p), GFP_KERNEL);
3179 if (p == NULL)
3180 return NULL;
3181 p->arg.fh = NFS_FH(inode);
3182 p->arg.fl = &p->fl;
3183 p->arg.seqid = seqid;
c1d51931 3184 p->res.seqid = seqid;
911d1aaf
TM		 3185 p->arg.stateid = &lsp->ls_stateid;
3186 p->lsp = lsp;
3187 atomic_inc(&lsp->ls_count);
3188 /* Ensure we don't close file until we're done freeing locks! */
3189 p->ctx = get_nfs_open_context(ctx);
3190 memcpy(&p->fl, fl, sizeof(p->fl));
3191 p->server = NFS_SERVER(inode);
3192 return p;
3193}
3194
06f814a3 3195static void nfs4_locku_release_calldata(void *data)
faf5f49c 3196{
963d8fe5 3197 struct nfs4_unlockdata *calldata = data;
911d1aaf 3198 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3199 nfs4_put_lock_state(calldata->lsp);
3200 put_nfs_open_context(calldata->ctx);
3201 kfree(calldata);
faf5f49c
TM		 3202}
3203
963d8fe5 3204static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3205{
963d8fe5 3206 struct nfs4_unlockdata *calldata = data;
faf5f49c 3207
06f814a3
TM		 3208 if (RPC_ASSASSINATED(task))
3209 return;
faf5f49c
TM		 3210 switch (task->tk_status) {
3211 case 0:
3212 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3213 calldata->res.stateid.data,
faf5f49c 3214 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3215 renew_lease(calldata->server, calldata->timestamp);
faf5f49c 3216 break;
9e33bed5
TM		 3217 case -NFS4ERR_BAD_STATEID:
3218 case -NFS4ERR_OLD_STATEID:
faf5f49c
TM		 3219 case -NFS4ERR_STALE_STATEID:
3220 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3221 break;
3222 default:
9e33bed5 3223 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
faf5f49c 3224 rpc_restart_call(task);
faf5f49c 3225 }
faf5f49c
TM		 3226}
3227
4ce70ada 3228static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3229{
4ce70ada 3230 struct nfs4_unlockdata *calldata = data;
faf5f49c 3231
911d1aaf 3232 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3233 return;
3234 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3235 /* Note: exit _without_ running nfs4_locku_done */
3236 task->tk_action = NULL;
faf5f49c
TM		 3237 return;
3238 }
26e976a8 3239 calldata->timestamp = jiffies;
5138fde0 3240 rpc_call_start(task);
faf5f49c
TM		 3241}
3242
963d8fe5 3243static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3244 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3245 .rpc_call_done = nfs4_locku_done,
06f814a3 3246 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3247};
3248
a5d16a4d
TM		 3249static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3250 struct nfs_open_context *ctx,
3251 struct nfs4_lock_state *lsp,
3252 struct nfs_seqid *seqid)
3253{
3254 struct nfs4_unlockdata *data;
5138fde0
TM		 3255 struct rpc_message msg = {
3256 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3257 .rpc_cred = ctx->cred,
3258 };
c970aa85
TM		 3259 struct rpc_task_setup task_setup_data = {
3260 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5138fde0 3261 .rpc_message = &msg,
c970aa85 3262 .callback_ops = &nfs4_locku_ops,
101070ca 3263 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3264 .flags = RPC_TASK_ASYNC,
3265 };
a5d16a4d 3266
137d6aca
FF		 3267 /* Ensure this is an unlock - when canceling a lock, the
3268 * canceled lock is passed in, and it won't be an unlock.
3269 */
3270 fl->fl_type = F_UNLCK;
3271
a5d16a4d
TM		 3272 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3273 if (data == NULL) {
3274 nfs_free_seqid(seqid);
3275 return ERR_PTR(-ENOMEM);
3276 }
3277
5138fde0
TM		 3278 msg.rpc_argp = &data->arg,
3279 msg.rpc_resp = &data->res,
c970aa85
TM		 3280 task_setup_data.callback_data = data;
3281 return rpc_run_task(&task_setup_data);
a5d16a4d
TM		 3282}
3283
faf5f49c
TM		 3284static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3285{
19e03c57 3286 struct nfs_inode *nfsi = NFS_I(state->inode);
911d1aaf 3287 struct nfs_seqid *seqid;
1da177e4 3288 struct nfs4_lock_state *lsp;
06f814a3
TM		 3289 struct rpc_task *task;
3290 int status = 0;
536ff0f8 3291 unsigned char fl_flags = request->fl_flags;
faf5f49c 3292
8d0a8a9d 3293 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3294 /* Unlock _before_ we do the RPC call */
3295 request->fl_flags |= FL_EXISTS;
19e03c57
TM		 3296 down_read(&nfsi->rwsem);
3297 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3298 up_read(&nfsi->rwsem);
9b073574 3299 goto out;
19e03c57
TM		 3300 }
3301 up_read(&nfsi->rwsem);
8d0a8a9d 3302 if (status != 0)
9b073574
TM		 3303 goto out;
3304 /* Is this a delegated lock? */
3305 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3306 goto out;
8d0a8a9d 3307 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3308 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3309 status = -ENOMEM;
911d1aaf 3310 if (seqid == NULL)
9b073574 3311 goto out;
cd3758e3 3312 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3313 status = PTR_ERR(task);
3314 if (IS_ERR(task))
9b073574 3315 goto out;
a5d16a4d 3316 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3317 rpc_put_task(task);
9b073574 3318out:
536ff0f8 3319 request->fl_flags = fl_flags;
1da177e4
LT		 3320 return status;
3321}
3322
a5d16a4d
TM		 3323struct nfs4_lockdata {
3324 struct nfs_lock_args arg;
3325 struct nfs_lock_res res;
3326 struct nfs4_lock_state *lsp;
3327 struct nfs_open_context *ctx;
3328 struct file_lock fl;
26e976a8 3329 unsigned long timestamp;
a5d16a4d
TM		 3330 int rpc_status;
3331 int cancelled;
3332};
3333
3334static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3335 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3336{
a5d16a4d
TM		 3337 struct nfs4_lockdata *p;
3338 struct inode *inode = lsp->ls_state->inode;
1da177e4 3339 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3340
3341 p = kzalloc(sizeof(*p), GFP_KERNEL);
3342 if (p == NULL)
3343 return NULL;
3344
3345 p->arg.fh = NFS_FH(inode);
3346 p->arg.fl = &p->fl;
2f74c0a0
TM		 3347 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3348 if (p->arg.open_seqid == NULL)
3349 goto out_free;
a5d16a4d
TM		 3350 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3351 if (p->arg.lock_seqid == NULL)
2f74c0a0 3352 goto out_free_seqid;
a5d16a4d 3353 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3354 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3355 p->arg.lock_owner.id = lsp->ls_id.id;
c1d51931 3356 p->res.lock_seqid = p->arg.lock_seqid;
a5d16a4d
TM		 3357 p->lsp = lsp;
3358 atomic_inc(&lsp->ls_count);
3359 p->ctx = get_nfs_open_context(ctx);
3360 memcpy(&p->fl, fl, sizeof(p->fl));
3361 return p;
2f74c0a0
TM		 3362out_free_seqid:
3363 nfs_free_seqid(p->arg.open_seqid);
a5d16a4d
TM		 3364out_free:
3365 kfree(p);
3366 return NULL;
3367}
3368
3369static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3370{
3371 struct nfs4_lockdata *data = calldata;
3372 struct nfs4_state *state = data->lsp->ls_state;
06735b34 3373
3110ff80 3374 dprintk("%s: begin!\n", __func__);
2f74c0a0
TM		 3375 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3376 return;
a5d16a4d
TM		 3377 /* Do we need to do an open_to_lock_owner? */
3378 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
e6e21970
TM		 3379 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3380 return;
a5d16a4d
TM		 3381 data->arg.open_stateid = &state->stateid;
3382 data->arg.new_lock_owner = 1;
c1d51931 3383 data->res.open_seqid = data->arg.open_seqid;
2f74c0a0
TM		 3384 } else
3385 data->arg.new_lock_owner = 0;
26e976a8 3386 data->timestamp = jiffies;
5138fde0 3387 rpc_call_start(task);
3110ff80 3388 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
a5d16a4d
TM		 3389}
3390
3391static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3392{
3393 struct nfs4_lockdata *data = calldata;
3394
3110ff80 3395 dprintk("%s: begin!\n", __func__);
a5d16a4d
TM		 3396
3397 data->rpc_status = task->tk_status;
3398 if (RPC_ASSASSINATED(task))
3399 goto out;
3400 if (data->arg.new_lock_owner != 0) {
a5d16a4d
TM		 3401 if (data->rpc_status == 0)
3402 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3403 else
3404 goto out;
3405 }
3406 if (data->rpc_status == 0) {
3407 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3408 sizeof(data->lsp->ls_stateid.data));
3409 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3410 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d 3411 }
a5d16a4d 3412out:
3110ff80 3413 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
a5d16a4d
TM		 3414}
3415
3416static void nfs4_lock_release(void *calldata)
3417{
3418 struct nfs4_lockdata *data = calldata;
3419
3110ff80 3420 dprintk("%s: begin!\n", __func__);
2f74c0a0 3421 nfs_free_seqid(data->arg.open_seqid);
a5d16a4d
TM		 3422 if (data->cancelled != 0) {
3423 struct rpc_task *task;
3424 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3425 data->arg.lock_seqid);
3426 if (!IS_ERR(task))
e6b3c4db 3427 rpc_put_task(task);
3110ff80 3428 dprintk("%s: cancelling lock!\n", __func__);
a5d16a4d
TM		 3429 } else
3430 nfs_free_seqid(data->arg.lock_seqid);
3431 nfs4_put_lock_state(data->lsp);
3432 put_nfs_open_context(data->ctx);
3433 kfree(data);
3110ff80 3434 dprintk("%s: done!\n", __func__);
a5d16a4d
TM		 3435}
3436
3437static const struct rpc_call_ops nfs4_lock_ops = {
3438 .rpc_call_prepare = nfs4_lock_prepare,
3439 .rpc_call_done = nfs4_lock_done,
3440 .rpc_release = nfs4_lock_release,
3441};
3442
3443static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3444{
3445 struct nfs4_lockdata *data;
3446 struct rpc_task *task;
5138fde0
TM		 3447 struct rpc_message msg = {
3448 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3449 .rpc_cred = state->owner->so_cred,
3450 };
c970aa85
TM		 3451 struct rpc_task_setup task_setup_data = {
3452 .rpc_client = NFS_CLIENT(state->inode),
5138fde0 3453 .rpc_message = &msg,
c970aa85 3454 .callback_ops = &nfs4_lock_ops,
101070ca 3455 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3456 .flags = RPC_TASK_ASYNC,
3457 };
a5d16a4d
TM		 3458 int ret;
3459
3110ff80 3460 dprintk("%s: begin!\n", __func__);
cd3758e3 3461 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3462 fl->fl_u.nfs4_fl.owner);
3463 if (data == NULL)
3464 return -ENOMEM;
3465 if (IS_SETLKW(cmd))
3466 data->arg.block = 1;
3467 if (reclaim != 0)
3468 data->arg.reclaim = 1;
5138fde0
TM		 3469 msg.rpc_argp = &data->arg,
3470 msg.rpc_resp = &data->res,
c970aa85
TM		 3471 task_setup_data.callback_data = data;
3472 task = rpc_run_task(&task_setup_data);
7a1218a2 3473 if (IS_ERR(task))
a5d16a4d 3474 return PTR_ERR(task);
a5d16a4d
TM		 3475 ret = nfs4_wait_for_completion_rpc_task(task);
3476 if (ret == 0) {
3477 ret = data->rpc_status;
3478 if (ret == -NFS4ERR_DENIED)
3479 ret = -EAGAIN;
3480 } else
3481 data->cancelled = 1;
e6b3c4db 3482 rpc_put_task(task);
3110ff80 3483 dprintk("%s: done, ret = %d!\n", __func__, ret);
a5d16a4d 3484 return ret;
1da177e4
LT		 3485}
3486
3487static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3488{
202b50dc
TM		 3489 struct nfs_server *server = NFS_SERVER(state->inode);
3490 struct nfs4_exception exception = { };
3491 int err;
3492
3493 do {
42a2d13e
TM		 3494 /* Cache the lock if possible... */
3495 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3496 return 0;
202b50dc
TM		 3497 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3498 if (err != -NFS4ERR_DELAY)
3499 break;
3500 nfs4_handle_exception(server, err, &exception);
3501 } while (exception.retry);
3502 return err;
1da177e4
LT		 3503}
3504
3505static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3506{
202b50dc
TM		 3507 struct nfs_server *server = NFS_SERVER(state->inode);
3508 struct nfs4_exception exception = { };
3509 int err;
3510
6bfc93ef
TM		 3511 err = nfs4_set_lock_state(state, request);
3512 if (err != 0)
3513 return err;
202b50dc 3514 do {
42a2d13e
TM		 3515 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3516 return 0;
202b50dc
TM		 3517 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3518 if (err != -NFS4ERR_DELAY)
3519 break;
3520 nfs4_handle_exception(server, err, &exception);
3521 } while (exception.retry);
3522 return err;
1da177e4
LT		 3523}
3524
3525static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3526{
19e03c57 3527 struct nfs_inode *nfsi = NFS_I(state->inode);
01c3b861 3528 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3529 int status;
3530
6bfc93ef 3531 /* Is this a delegated open? */
6bfc93ef
TM		 3532 status = nfs4_set_lock_state(state, request);
3533 if (status != 0)
3534 goto out;
01c3b861
TM		 3535 request->fl_flags |= FL_ACCESS;
3536 status = do_vfs_lock(request->fl_file, request);
3537 if (status < 0)
3538 goto out;
19e03c57 3539 down_read(&nfsi->rwsem);
01c3b861 3540 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
01c3b861 3541 /* Yes: cache locks! */
01c3b861 3542 /* ...but avoid races with delegation recall... */
19e03c57
TM		 3543 request->fl_flags = fl_flags & ~FL_SLEEP;
3544 status = do_vfs_lock(request->fl_file, request);
3545 goto out_unlock;
01c3b861 3546 }
6bfc93ef
TM		 3547 status = _nfs4_do_setlk(state, cmd, request, 0);
3548 if (status != 0)
01c3b861 3549 goto out_unlock;
6bfc93ef 3550 /* Note: we always want to sleep here! */
01c3b861 3551 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef 3552 if (do_vfs_lock(request->fl_file, request) < 0)
3110ff80 3553 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
01c3b861 3554out_unlock:
19e03c57 3555 up_read(&nfsi->rwsem);
01c3b861
TM		 3556out:
3557 request->fl_flags = fl_flags;
1da177e4
LT		 3558 return status;
3559}
3560
3561static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3562{
3563 struct nfs4_exception exception = { };
3564 int err;
3565
3566 do {
3567 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3568 _nfs4_proc_setlk(state, cmd, request),
3569 &exception);
3570 } while (exception.retry);
3571 return err;
3572}
3573
3574static int
3575nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3576{
3577 struct nfs_open_context *ctx;
3578 struct nfs4_state *state;
3579 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3580 int status;
3581
3582 /* verify open state */
cd3758e3 3583 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3584 state = ctx->state;
3585
3586 if (request->fl_start < 0 || request->fl_end < 0)
3587 return -EINVAL;
3588
3589 if (IS_GETLK(cmd))
3590 return nfs4_proc_getlk(state, F_GETLK, request);
3591
3592 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3593 return -EINVAL;
3594
3595 if (request->fl_type == F_UNLCK)
3596 return nfs4_proc_unlck(state, cmd, request);
3597
3598 do {
3599 status = nfs4_proc_setlk(state, cmd, request);
3600 if ((status != -EAGAIN) || IS_SETLK(cmd))
3601 break;
3602 timeout = nfs4_set_lock_task_retry(timeout);
3603 status = -ERESTARTSYS;
3604 if (signalled())
3605 break;
3606 } while(status < 0);
1da177e4
LT		 3607 return status;
3608}
3609
888e694c
TM		 3610int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3611{
3612 struct nfs_server *server = NFS_SERVER(state->inode);
3613 struct nfs4_exception exception = { };
3614 int err;
3615
3616 err = nfs4_set_lock_state(state, fl);
3617 if (err != 0)
3618 goto out;
3619 do {
3620 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3621 if (err != -NFS4ERR_DELAY)
3622 break;
3623 err = nfs4_handle_exception(server, err, &exception);
3624 } while (exception.retry);
3625out:
3626 return err;
3627}
6b3b5496 3628
aa1870af
BF		 3629#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3630
6b3b5496
BF		 3631int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3632 size_t buflen, int flags)
3633{
4b580ee3
BF		 3634 struct inode *inode = dentry->d_inode;
3635
3636 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3637 return -EOPNOTSUPP;
3638
4b580ee3 3639 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3640}
3641
3642/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3643 * and that's what we'll do for e.g. user attributes that haven't been set.
3644 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3645 * attributes in kernel-managed attribute namespaces. */
3646ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3647 size_t buflen)
3648{
aa1870af
BF		 3649 struct inode *inode = dentry->d_inode;
3650
3651 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3652 return -EOPNOTSUPP;
3653
3654 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3655}
3656
3657ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3658{
aa1870af 3659 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3660
096455a2
BF		 3661 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3662 return 0;
6b3b5496
BF		 3663 if (buf && buflen < len)
3664 return -ERANGE;
3665 if (buf)
aa1870af
BF		 3666 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3667 return len;
6b3b5496
BF		 3668}
3669
56659e99 3670int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3671 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3672{
3673 struct nfs_server *server = NFS_SERVER(dir);
3674 u32 bitmask[2] = {
361e624f
MN		 3675 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3676 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3677 };
3678 struct nfs4_fs_locations_arg args = {
3679 .dir_fh = NFS_FH(dir),
c228fd3a 3680 .name = name,
683b57b4
TM		 3681 .page = page,
3682 .bitmask = bitmask,
3683 };
3684 struct rpc_message msg = {
3685 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3686 .rpc_argp = &args,
7aaa0b3b 3687 .rpc_resp = fs_locations,
683b57b4
TM		 3688 };
3689 int status;
3690
3110ff80 3691 dprintk("%s: start\n", __func__);
c228fd3a 3692 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3693 fs_locations->server = server;
830b8e33 3694 fs_locations->nlocations = 0;
683b57b4 3695 status = rpc_call_sync(server->client, &msg, 0);
3110ff80 3696 dprintk("%s: returned status = %d\n", __func__, status);
683b57b4
TM		 3697 return status;
3698}
3699
1da177e4 3700struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
7eff03ae 3701 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
b79a4a1b 3702 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
1da177e4
LT		 3703 .recover_open = nfs4_open_reclaim,
3704 .recover_lock = nfs4_lock_reclaim,
3705};
3706
b79a4a1b 3707struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
7eff03ae 3708 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
b79a4a1b 3709 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
1da177e4
LT		 3710 .recover_open = nfs4_open_expired,
3711 .recover_lock = nfs4_lock_expired,
3712};
3713
92e1d5be 3714static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3715 .permission = nfs_permission,
3716 .getattr = nfs_getattr,
3717 .setattr = nfs_setattr,
3718 .getxattr = nfs4_getxattr,
3719 .setxattr = nfs4_setxattr,
3720 .listxattr = nfs4_listxattr,
3721};
3722
509de811 3723const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3724 .version = 4, /* protocol version */
3725 .dentry_ops = &nfs4_dentry_operations,
3726 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3727 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3728 .getroot = nfs4_proc_get_root,
3729 .getattr = nfs4_proc_getattr,
3730 .setattr = nfs4_proc_setattr,
2b3de441 3731 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3732 .lookup = nfs4_proc_lookup,
3733 .access = nfs4_proc_access,
3734 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3735 .create = nfs4_proc_create,
3736 .remove = nfs4_proc_remove,
3737 .unlink_setup = nfs4_proc_unlink_setup,
3738 .unlink_done = nfs4_proc_unlink_done,
3739 .rename = nfs4_proc_rename,
3740 .link = nfs4_proc_link,
3741 .symlink = nfs4_proc_symlink,
3742 .mkdir = nfs4_proc_mkdir,
3743 .rmdir = nfs4_proc_remove,
3744 .readdir = nfs4_proc_readdir,
3745 .mknod = nfs4_proc_mknod,
3746 .statfs = nfs4_proc_statfs,
3747 .fsinfo = nfs4_proc_fsinfo,
3748 .pathconf = nfs4_proc_pathconf,
e9326dca 3749 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3750 .decode_dirent = nfs4_decode_dirent,
3751 .read_setup = nfs4_proc_read_setup,
ec06c096 3752 .read_done = nfs4_read_done,
1da177e4 3753 .write_setup = nfs4_proc_write_setup,
788e7a89 3754 .write_done = nfs4_write_done,
1da177e4 3755 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3756 .commit_done = nfs4_commit_done,
1da177e4 3757 .lock = nfs4_proc_lock,
e50a1c2e 3758 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3759};
3760
3761/*
3762 * Local variables:
3763 * c-basic-offset: 8
3764 * End:
3765 */
Linux 6.x block layer and io_uring tree(s)