projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
NFSv4: Ensure that file unlock requests don't conflict with state recovery
[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 *);
faf5f49c 65static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
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
210 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
211
212 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
213 nfs4_wait_bit_killable, TASK_KILLABLE);
214
215 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
216 return res;
217}
218
219static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
220{
221 int res = 0;
222
223 might_sleep();
224
225 if (*timeout <= 0)
226 *timeout = NFS4_POLL_RETRY_MIN;
227 if (*timeout > NFS4_POLL_RETRY_MAX)
228 *timeout = NFS4_POLL_RETRY_MAX;
229 schedule_timeout_killable(*timeout);
230 if (fatal_signal_pending(current))
231 res = -ERESTARTSYS;
232 *timeout <<= 1;
233 return res;
234}
235
236/* This is the error handling routine for processes that are allowed
237 * to sleep.
238 */
239static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
240{
241 struct nfs_client *clp = server->nfs_client;
242 int ret = errorcode;
243
244 exception->retry = 0;
245 switch(errorcode) {
246 case 0:
247 return 0;
248 case -NFS4ERR_STALE_CLIENTID:
249 case -NFS4ERR_STALE_STATEID:
250 case -NFS4ERR_EXPIRED:
251 nfs4_schedule_state_recovery(clp);
252 ret = nfs4_wait_clnt_recover(clp);
253 if (ret == 0)
254 exception->retry = 1;
255 break;
256 case -NFS4ERR_FILE_OPEN:
257 case -NFS4ERR_GRACE:
258 case -NFS4ERR_DELAY:
259 ret = nfs4_delay(server->client, &exception->timeout);
260 if (ret != 0)
261 break;
262 case -NFS4ERR_OLD_STATEID:
263 exception->retry = 1;
264 }
265 /* We failed to handle the error */
266 return nfs4_map_errors(ret);
267}
268
269
26e976a8 270static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 271{
7539bbab 272 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 273 spin_lock(&clp->cl_lock);
274 if (time_before(clp->cl_last_renewal,timestamp))
275 clp->cl_last_renewal = timestamp;
276 spin_unlock(&clp->cl_lock);
277}
278
38478b24 279static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 280{
38478b24 281 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 282
38478b24 283 spin_lock(&dir->i_lock);
40d24704
TM		 284 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
285 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
bfc69a45 286 nfs_force_lookup_revalidate(dir);
40d24704 287 nfsi->change_attr = cinfo->after;
38478b24 288 spin_unlock(&dir->i_lock);
1da177e4
LT		 289}
290
e56e0b78 291struct nfs4_opendata {
c6d00e63 292 struct kref kref;
e56e0b78
TM		 293 struct nfs_openargs o_arg;
294 struct nfs_openres o_res;
cdd4e68b
TM		 295 struct nfs_open_confirmargs c_arg;
296 struct nfs_open_confirmres c_res;
e56e0b78
TM		 297 struct nfs_fattr f_attr;
298 struct nfs_fattr dir_attr;
ad389da7 299 struct path path;
e56e0b78
TM		 300 struct dentry *dir;
301 struct nfs4_state_owner *owner;
aac00a8d 302 struct nfs4_state *state;
e56e0b78 303 struct iattr attrs;
26e976a8 304 unsigned long timestamp;
3e309914 305 unsigned int rpc_done : 1;
24ac23ab
TM		 306 int rpc_status;
307 int cancelled;
e56e0b78
TM		 308};
309
2ced46c2
TM		 310
311static void nfs4_init_opendata_res(struct nfs4_opendata *p)
312{
313 p->o_res.f_attr = &p->f_attr;
314 p->o_res.dir_attr = &p->dir_attr;
c1d51931
TM		 315 p->o_res.seqid = p->o_arg.seqid;
316 p->c_res.seqid = p->c_arg.seqid;
2ced46c2
TM		 317 p->o_res.server = p->o_arg.server;
318 nfs_fattr_init(&p->f_attr);
319 nfs_fattr_init(&p->dir_attr);
320}
321
ad389da7 322static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
e56e0b78
TM		 323 struct nfs4_state_owner *sp, int flags,
324 const struct iattr *attrs)
325{
ad389da7 326 struct dentry *parent = dget_parent(path->dentry);
e56e0b78
TM		 327 struct inode *dir = parent->d_inode;
328 struct nfs_server *server = NFS_SERVER(dir);
329 struct nfs4_opendata *p;
330
331 p = kzalloc(sizeof(*p), GFP_KERNEL);
332 if (p == NULL)
333 goto err;
334 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
335 if (p->o_arg.seqid == NULL)
336 goto err_free;
ad389da7
TM		 337 p->path.mnt = mntget(path->mnt);
338 p->path.dentry = dget(path->dentry);
e56e0b78
TM		 339 p->dir = parent;
340 p->owner = sp;
341 atomic_inc(&sp->so_count);
342 p->o_arg.fh = NFS_FH(dir);
343 p->o_arg.open_flags = flags,
7539bbab 344 p->o_arg.clientid = server->nfs_client->cl_clientid;
9f958ab8 345 p->o_arg.id = sp->so_owner_id.id;
ad389da7 346 p->o_arg.name = &p->path.dentry->d_name;
e56e0b78
TM		 347 p->o_arg.server = server;
348 p->o_arg.bitmask = server->attr_bitmask;
349 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
e56e0b78
TM		 350 if (flags & O_EXCL) {
351 u32 *s = (u32 *) p->o_arg.u.verifier.data;
352 s[0] = jiffies;
353 s[1] = current->pid;
354 } else if (flags & O_CREAT) {
355 p->o_arg.u.attrs = &p->attrs;
356 memcpy(&p->attrs, attrs, sizeof(p->attrs));
357 }
cdd4e68b
TM		 358 p->c_arg.fh = &p->o_res.fh;
359 p->c_arg.stateid = &p->o_res.stateid;
360 p->c_arg.seqid = p->o_arg.seqid;
2ced46c2 361 nfs4_init_opendata_res(p);
c6d00e63 362 kref_init(&p->kref);
e56e0b78
TM		 363 return p;
364err_free:
365 kfree(p);
366err:
367 dput(parent);
368 return NULL;
369}
370
c6d00e63 371static void nfs4_opendata_free(struct kref *kref)
e56e0b78 372{
c6d00e63
TM		 373 struct nfs4_opendata *p = container_of(kref,
374 struct nfs4_opendata, kref);
375
376 nfs_free_seqid(p->o_arg.seqid);
aac00a8d
TM		 377 if (p->state != NULL)
378 nfs4_put_open_state(p->state);
c6d00e63
TM		 379 nfs4_put_state_owner(p->owner);
380 dput(p->dir);
31f31db1 381 path_put(&p->path);
c6d00e63
TM		 382 kfree(p);
383}
384
385static void nfs4_opendata_put(struct nfs4_opendata *p)
386{
387 if (p != NULL)
388 kref_put(&p->kref, nfs4_opendata_free);
e56e0b78
TM		 389}
390
06f814a3
TM		 391static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
392{
06f814a3
TM		 393 int ret;
394
06f814a3 395 ret = rpc_wait_for_completion_task(task);
06f814a3
TM		 396 return ret;
397}
398
6ee41268
TM		 399static int can_open_cached(struct nfs4_state *state, int mode)
400{
401 int ret = 0;
402 switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
403 case FMODE_READ:
404 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
6ee41268
TM		 405 break;
406 case FMODE_WRITE:
407 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
6ee41268
TM		 408 break;
409 case FMODE_READ|FMODE_WRITE:
410 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
411 }
412 return ret;
413}
414
aac00a8d
TM		 415static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
416{
417 if ((delegation->type & open_flags) != open_flags)
418 return 0;
15c831bf 419 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
aac00a8d
TM		 420 return 0;
421 return 1;
422}
423
003707c7 424static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
e7616923
TM		 425{
426 switch (open_flags) {
427 case FMODE_WRITE:
428 state->n_wronly++;
429 break;
430 case FMODE_READ:
431 state->n_rdonly++;
432 break;
433 case FMODE_READ|FMODE_WRITE:
434 state->n_rdwr++;
435 }
003707c7
TM		 436 nfs4_state_set_mode_locked(state, state->state | open_flags);
437}
438
439static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
440{
441 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
442 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
443 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
444 switch (open_flags) {
445 case FMODE_READ:
446 set_bit(NFS_O_RDONLY_STATE, &state->flags);
447 break;
448 case FMODE_WRITE:
449 set_bit(NFS_O_WRONLY_STATE, &state->flags);
450 break;
451 case FMODE_READ|FMODE_WRITE:
452 set_bit(NFS_O_RDWR_STATE, &state->flags);
453 }
e7616923
TM		 454}
455
003707c7
TM		 456static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
457{
8bda4e4c 458 write_seqlock(&state->seqlock);
003707c7 459 nfs_set_open_stateid_locked(state, stateid, open_flags);
8bda4e4c 460 write_sequnlock(&state->seqlock);
003707c7
TM		 461}
462
34310430 463static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, int open_flags)
1da177e4 464{
8bda4e4c
TM		 465 /*
466 * Protect the call to nfs4_state_set_mode_locked and
467 * serialise the stateid update
468 */
469 write_seqlock(&state->seqlock);
003707c7
TM		 470 if (deleg_stateid != NULL) {
471 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
472 set_bit(NFS_DELEGATED_STATE, &state->flags);
473 }
474 if (open_stateid != NULL)
475 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
8bda4e4c
TM		 476 write_sequnlock(&state->seqlock);
477 spin_lock(&state->owner->so_lock);
e7616923 478 update_open_stateflags(state, open_flags);
ec073428 479 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 480}
481
34310430
TM		 482static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, int open_flags)
483{
484 struct nfs_inode *nfsi = NFS_I(state->inode);
485 struct nfs_delegation *deleg_cur;
486 int ret = 0;
487
488 open_flags &= (FMODE_READ|FMODE_WRITE);
489
490 rcu_read_lock();
491 deleg_cur = rcu_dereference(nfsi->delegation);
492 if (deleg_cur == NULL)
493 goto no_delegation;
494
495 spin_lock(&deleg_cur->lock);
496 if (nfsi->delegation != deleg_cur ||
497 (deleg_cur->type & open_flags) != open_flags)
498 goto no_delegation_unlock;
499
500 if (delegation == NULL)
501 delegation = &deleg_cur->stateid;
502 else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
503 goto no_delegation_unlock;
504
505 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, open_flags);
506 ret = 1;
507no_delegation_unlock:
508 spin_unlock(&deleg_cur->lock);
509no_delegation:
510 rcu_read_unlock();
511
512 if (!ret && open_stateid != NULL) {
513 __update_open_stateid(state, open_stateid, NULL, open_flags);
514 ret = 1;
515 }
516
517 return ret;
518}
519
520
aac00a8d
TM		 521static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
522{
523 struct nfs_delegation *delegation;
524
525 rcu_read_lock();
526 delegation = rcu_dereference(NFS_I(inode)->delegation);
527 if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
528 rcu_read_unlock();
529 return;
530 }
531 rcu_read_unlock();
532 nfs_inode_return_delegation(inode);
533}
534
6ee41268 535static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
aac00a8d
TM		 536{
537 struct nfs4_state *state = opendata->state;
538 struct nfs_inode *nfsi = NFS_I(state->inode);
539 struct nfs_delegation *delegation;
540 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
541 nfs4_stateid stateid;
542 int ret = -EAGAIN;
543
aac00a8d 544 for (;;) {
6ee41268
TM		 545 if (can_open_cached(state, open_mode)) {
546 spin_lock(&state->owner->so_lock);
547 if (can_open_cached(state, open_mode)) {
548 update_open_stateflags(state, open_mode);
549 spin_unlock(&state->owner->so_lock);
6ee41268
TM		 550 goto out_return_state;
551 }
552 spin_unlock(&state->owner->so_lock);
553 }
34310430
TM		 554 rcu_read_lock();
555 delegation = rcu_dereference(nfsi->delegation);
556 if (delegation == NULL ||
557 !can_open_delegated(delegation, open_mode)) {
558 rcu_read_unlock();
aac00a8d 559 break;
34310430 560 }
aac00a8d
TM		 561 /* Save the delegation */
562 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
563 rcu_read_unlock();
af22f94a 564 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
aac00a8d
TM		 565 if (ret != 0)
566 goto out;
567 ret = -EAGAIN;
34310430
TM		 568
569 /* Try to update the stateid using the delegation */
570 if (update_open_stateid(state, NULL, &stateid, open_mode))
571 goto out_return_state;
aac00a8d 572 }
aac00a8d
TM		 573out:
574 return ERR_PTR(ret);
575out_return_state:
576 atomic_inc(&state->count);
577 return state;
578}
579
24ac23ab
TM		 580static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
581{
582 struct inode *inode;
583 struct nfs4_state *state = NULL;
003707c7 584 struct nfs_delegation *delegation;
1b370bc2 585 int ret;
24ac23ab 586
aac00a8d 587 if (!data->rpc_done) {
6ee41268 588 state = nfs4_try_open_cached(data);
aac00a8d
TM		 589 goto out;
590 }
591
1b370bc2 592 ret = -EAGAIN;
24ac23ab 593 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1b370bc2 594 goto err;
24ac23ab 595 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1b370bc2 596 ret = PTR_ERR(inode);
03f28e3a 597 if (IS_ERR(inode))
1b370bc2
TM		 598 goto err;
599 ret = -ENOMEM;
24ac23ab
TM		 600 state = nfs4_get_open_state(inode, data->owner);
601 if (state == NULL)
1b370bc2 602 goto err_put_inode;
549d6ed5 603 if (data->o_res.delegation_type != 0) {
549d6ed5
TM		 604 int delegation_flags = 0;
605
003707c7
TM		 606 rcu_read_lock();
607 delegation = rcu_dereference(NFS_I(inode)->delegation);
608 if (delegation)
609 delegation_flags = delegation->flags;
610 rcu_read_unlock();
15c831bf 611 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
549d6ed5
TM		 612 nfs_inode_set_delegation(state->inode,
613 data->owner->so_cred,
614 &data->o_res);
615 else
616 nfs_inode_reclaim_delegation(state->inode,
617 data->owner->so_cred,
618 &data->o_res);
619 }
34310430
TM		 620
621 update_open_stateid(state, &data->o_res.stateid, NULL,
622 data->o_arg.open_flags);
24ac23ab 623 iput(inode);
aac00a8d 624out:
24ac23ab 625 return state;
1b370bc2
TM		 626err_put_inode:
627 iput(inode);
628err:
629 return ERR_PTR(ret);
24ac23ab
TM		 630}
631
864472e9
TM		 632static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
633{
634 struct nfs_inode *nfsi = NFS_I(state->inode);
635 struct nfs_open_context *ctx;
636
637 spin_lock(&state->inode->i_lock);
638 list_for_each_entry(ctx, &nfsi->open_files, list) {
639 if (ctx->state != state)
640 continue;
641 get_nfs_open_context(ctx);
642 spin_unlock(&state->inode->i_lock);
643 return ctx;
644 }
645 spin_unlock(&state->inode->i_lock);
646 return ERR_PTR(-ENOENT);
647}
648
6f220ed5
TM		 649static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
650{
651 struct nfs4_opendata *opendata;
652
653 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
654 if (opendata == NULL)
655 return ERR_PTR(-ENOMEM);
656 opendata->state = state;
657 atomic_inc(&state->count);
658 return opendata;
659}
660
2ced46c2 661static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
864472e9 662{
2ced46c2 663 struct nfs4_state *newstate;
864472e9
TM		 664 int ret;
665
666 opendata->o_arg.open_flags = openflags;
2ced46c2
TM		 667 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
668 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
669 nfs4_init_opendata_res(opendata);
864472e9
TM		 670 ret = _nfs4_proc_open(opendata);
671 if (ret != 0)
672 return ret;
2ced46c2 673 newstate = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 674 if (IS_ERR(newstate))
675 return PTR_ERR(newstate);
676 nfs4_close_state(&opendata->path, newstate, openflags);
2ced46c2 677 *res = newstate;
864472e9
TM		 678 return 0;
679}
680
681static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
682{
864472e9 683 struct nfs4_state *newstate;
864472e9
TM		 684 int ret;
685
686 /* memory barrier prior to reading state->n_* */
2ced46c2 687 clear_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9
TM		 688 smp_rmb();
689 if (state->n_rdwr != 0) {
2ced46c2 690 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
864472e9
TM		 691 if (ret != 0)
692 return ret;
2ced46c2
TM		 693 if (newstate != state)
694 return -ESTALE;
864472e9
TM		 695 }
696 if (state->n_wronly != 0) {
2ced46c2 697 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
864472e9
TM		 698 if (ret != 0)
699 return ret;
2ced46c2
TM		 700 if (newstate != state)
701 return -ESTALE;
864472e9
TM		 702 }
703 if (state->n_rdonly != 0) {
2ced46c2 704 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
864472e9
TM		 705 if (ret != 0)
706 return ret;
2ced46c2
TM		 707 if (newstate != state)
708 return -ESTALE;
864472e9 709 }
1ac7e2fd
TM		 710 /*
711 * We may have performed cached opens for all three recoveries.
712 * Check if we need to update the current stateid.
713 */
714 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
715 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
8bda4e4c 716 write_seqlock(&state->seqlock);
1ac7e2fd
TM		 717 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
718 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
8bda4e4c 719 write_sequnlock(&state->seqlock);
1ac7e2fd 720 }
864472e9
TM		 721 return 0;
722}
723
1da177e4
LT		 724/*
725 * OPEN_RECLAIM:
726 * reclaim state on the server after a reboot.
1da177e4 727 */
539cd03a 728static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 729{
1ac7e2fd 730 struct nfs_delegation *delegation;
864472e9
TM		 731 struct nfs4_opendata *opendata;
732 int delegation_type = 0;
1da177e4
LT		 733 int status;
734
6f220ed5
TM		 735 opendata = nfs4_open_recoverdata_alloc(ctx, state);
736 if (IS_ERR(opendata))
737 return PTR_ERR(opendata);
864472e9
TM		 738 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
739 opendata->o_arg.fh = NFS_FH(state->inode);
1ac7e2fd
TM		 740 rcu_read_lock();
741 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
15c831bf 742 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
65bbf6bd 743 delegation_type = delegation->type;
1ac7e2fd 744 rcu_read_unlock();
864472e9
TM		 745 opendata->o_arg.u.delegation_type = delegation_type;
746 status = nfs4_open_recover(opendata, state);
c6d00e63 747 nfs4_opendata_put(opendata);
1da177e4
LT		 748 return status;
749}
750
539cd03a 751static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 752{
753 struct nfs_server *server = NFS_SERVER(state->inode);
754 struct nfs4_exception exception = { };
755 int err;
756 do {
539cd03a 757 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 758 if (err != -NFS4ERR_DELAY)
759 break;
760 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 761 } while (exception.retry);
762 return err;
763}
764
864472e9
TM		 765static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
766{
767 struct nfs_open_context *ctx;
768 int ret;
769
770 ctx = nfs4_state_find_open_context(state);
771 if (IS_ERR(ctx))
772 return PTR_ERR(ctx);
539cd03a 773 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 774 put_nfs_open_context(ctx);
775 return ret;
776}
777
13437e12 778static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4 779{
e56e0b78 780 struct nfs4_opendata *opendata;
864472e9 781 int ret;
1da177e4 782
6f220ed5
TM		 783 opendata = nfs4_open_recoverdata_alloc(ctx, state);
784 if (IS_ERR(opendata))
785 return PTR_ERR(opendata);
e56e0b78 786 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
13437e12 787 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
e56e0b78 788 sizeof(opendata->o_arg.u.delegation.data));
864472e9 789 ret = nfs4_open_recover(opendata, state);
c6d00e63 790 nfs4_opendata_put(opendata);
864472e9 791 return ret;
1da177e4
LT		 792}
793
13437e12 794int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 795{
796 struct nfs4_exception exception = { };
539cd03a 797 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 798 int err;
799 do {
13437e12 800 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1da177e4
LT		 801 switch (err) {
802 case 0:
803 return err;
804 case -NFS4ERR_STALE_CLIENTID:
805 case -NFS4ERR_STALE_STATEID:
806 case -NFS4ERR_EXPIRED:
807 /* Don't recall a delegation if it was lost */
7539bbab 808 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 809 return err;
810 }
811 err = nfs4_handle_exception(server, err, &exception);
812 } while (exception.retry);
813 return err;
814}
815
cdd4e68b
TM		 816static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
817{
818 struct nfs4_opendata *data = calldata;
819
820 data->rpc_status = task->tk_status;
821 if (RPC_ASSASSINATED(task))
822 return;
26e976a8 823 if (data->rpc_status == 0) {
cdd4e68b
TM		 824 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
825 sizeof(data->o_res.stateid.data));
bb22629e 826 nfs_confirm_seqid(&data->owner->so_seqid, 0);
26e976a8 827 renew_lease(data->o_res.server, data->timestamp);
3e309914 828 data->rpc_done = 1;
26e976a8 829 }
cdd4e68b
TM		 830}
831
832static void nfs4_open_confirm_release(void *calldata)
833{
834 struct nfs4_opendata *data = calldata;
835 struct nfs4_state *state = NULL;
836
837 /* If this request hasn't been cancelled, do nothing */
838 if (data->cancelled == 0)
839 goto out_free;
840 /* In case of error, no cleanup! */
3e309914 841 if (!data->rpc_done)
cdd4e68b 842 goto out_free;
cdd4e68b 843 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 844 if (!IS_ERR(state))
4a35bd41 845 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 846out_free:
c6d00e63 847 nfs4_opendata_put(data);
cdd4e68b
TM		 848}
849
850static const struct rpc_call_ops nfs4_open_confirm_ops = {
cdd4e68b
TM		 851 .rpc_call_done = nfs4_open_confirm_done,
852 .rpc_release = nfs4_open_confirm_release,
853};
854
855/*
856 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
857 */
858static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
859{
860 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
861 struct rpc_task *task;
5138fde0
TM		 862 struct rpc_message msg = {
863 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
864 .rpc_argp = &data->c_arg,
865 .rpc_resp = &data->c_res,
866 .rpc_cred = data->owner->so_cred,
867 };
c970aa85
TM		 868 struct rpc_task_setup task_setup_data = {
869 .rpc_client = server->client,
5138fde0 870 .rpc_message = &msg,
c970aa85
TM		 871 .callback_ops = &nfs4_open_confirm_ops,
872 .callback_data = data,
101070ca 873 .workqueue = nfsiod_workqueue,
c970aa85
TM		 874 .flags = RPC_TASK_ASYNC,
875 };
1da177e4
LT		 876 int status;
877
c6d00e63 878 kref_get(&data->kref);
3e309914
TM		 879 data->rpc_done = 0;
880 data->rpc_status = 0;
5138fde0 881 data->timestamp = jiffies;
c970aa85 882 task = rpc_run_task(&task_setup_data);
7a1218a2 883 if (IS_ERR(task))
cdd4e68b 884 return PTR_ERR(task);
cdd4e68b
TM		 885 status = nfs4_wait_for_completion_rpc_task(task);
886 if (status != 0) {
887 data->cancelled = 1;
888 smp_wmb();
889 } else
890 status = data->rpc_status;
e6b3c4db 891 rpc_put_task(task);
1da177e4
LT		 892 return status;
893}
894
24ac23ab 895static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 896{
24ac23ab
TM		 897 struct nfs4_opendata *data = calldata;
898 struct nfs4_state_owner *sp = data->owner;
5138fde0 899
24ac23ab
TM		 900 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
901 return;
aac00a8d
TM		 902 /*
903 * Check if we still need to send an OPEN call, or if we can use
904 * a delegation instead.
905 */
906 if (data->state != NULL) {
907 struct nfs_delegation *delegation;
908
6ee41268
TM		 909 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
910 goto out_no_action;
aac00a8d
TM		 911 rcu_read_lock();
912 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
913 if (delegation != NULL &&
15c831bf 914 test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
aac00a8d 915 rcu_read_unlock();
6ee41268 916 goto out_no_action;
aac00a8d
TM		 917 }
918 rcu_read_unlock();
919 }
24ac23ab 920 /* Update sequence id. */
9f958ab8 921 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 922 data->o_arg.clientid = sp->so_client->cl_clientid;
6f220ed5 923 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
5138fde0 924 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
6f220ed5
TM		 925 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
926 }
26e976a8 927 data->timestamp = jiffies;
5138fde0 928 rpc_call_start(task);
6ee41268
TM		 929 return;
930out_no_action:
931 task->tk_action = NULL;
932
24ac23ab 933}
1da177e4 934
24ac23ab
TM		 935static void nfs4_open_done(struct rpc_task *task, void *calldata)
936{
937 struct nfs4_opendata *data = calldata;
1da177e4 938
24ac23ab
TM		 939 data->rpc_status = task->tk_status;
940 if (RPC_ASSASSINATED(task))
941 return;
942 if (task->tk_status == 0) {
943 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 944 case S_IFREG:
945 break;
946 case S_IFLNK:
24ac23ab 947 data->rpc_status = -ELOOP;
6f926b5b
TM		 948 break;
949 case S_IFDIR:
24ac23ab 950 data->rpc_status = -EISDIR;
6f926b5b
TM		 951 break;
952 default:
24ac23ab 953 data->rpc_status = -ENOTDIR;
6f926b5b 954 }
26e976a8 955 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 956 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
957 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 958 }
3e309914 959 data->rpc_done = 1;
24ac23ab 960}
6f926b5b 961
24ac23ab
TM		 962static void nfs4_open_release(void *calldata)
963{
964 struct nfs4_opendata *data = calldata;
965 struct nfs4_state *state = NULL;
966
967 /* If this request hasn't been cancelled, do nothing */
968 if (data->cancelled == 0)
969 goto out_free;
970 /* In case of error, no cleanup! */
3e309914 971 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 972 goto out_free;
973 /* In case we need an open_confirm, no cleanup! */
974 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
975 goto out_free;
24ac23ab 976 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 977 if (!IS_ERR(state))
4a35bd41 978 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 979out_free:
c6d00e63 980 nfs4_opendata_put(data);
24ac23ab
TM		 981}
982
983static const struct rpc_call_ops nfs4_open_ops = {
984 .rpc_call_prepare = nfs4_open_prepare,
985 .rpc_call_done = nfs4_open_done,
986 .rpc_release = nfs4_open_release,
987};
988
989/*
990 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
991 */
992static int _nfs4_proc_open(struct nfs4_opendata *data)
993{
994 struct inode *dir = data->dir->d_inode;
995 struct nfs_server *server = NFS_SERVER(dir);
996 struct nfs_openargs *o_arg = &data->o_arg;
997 struct nfs_openres *o_res = &data->o_res;
998 struct rpc_task *task;
5138fde0
TM		 999 struct rpc_message msg = {
1000 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1001 .rpc_argp = o_arg,
1002 .rpc_resp = o_res,
1003 .rpc_cred = data->owner->so_cred,
1004 };
c970aa85
TM		 1005 struct rpc_task_setup task_setup_data = {
1006 .rpc_client = server->client,
5138fde0 1007 .rpc_message = &msg,
c970aa85
TM		 1008 .callback_ops = &nfs4_open_ops,
1009 .callback_data = data,
101070ca 1010 .workqueue = nfsiod_workqueue,
c970aa85
TM		 1011 .flags = RPC_TASK_ASYNC,
1012 };
24ac23ab
TM		 1013 int status;
1014
c6d00e63 1015 kref_get(&data->kref);
3e309914
TM		 1016 data->rpc_done = 0;
1017 data->rpc_status = 0;
2ced46c2 1018 data->cancelled = 0;
c970aa85 1019 task = rpc_run_task(&task_setup_data);
7a1218a2 1020 if (IS_ERR(task))
24ac23ab 1021 return PTR_ERR(task);
24ac23ab
TM		 1022 status = nfs4_wait_for_completion_rpc_task(task);
1023 if (status != 0) {
1024 data->cancelled = 1;
1025 smp_wmb();
1026 } else
1027 status = data->rpc_status;
e6b3c4db 1028 rpc_put_task(task);
3e309914 1029 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 1030 return status;
1031
9936781d
TM		 1032 if (o_res->fh.size == 0)
1033 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1034
56ae19f3
TM		 1035 if (o_arg->open_flags & O_CREAT) {
1036 update_changeattr(dir, &o_res->cinfo);
1037 nfs_post_op_update_inode(dir, o_res->dir_attr);
1038 } else
1039 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 1040 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 1041 status = _nfs4_proc_open_confirm(data);
1da177e4 1042 if (status != 0)
24ac23ab 1043 return status;
1da177e4
LT		 1044 }
1045 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
9936781d 1046 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 1047 return 0;
1da177e4
LT		 1048}
1049
10afec90 1050static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 1051{
7539bbab 1052 struct nfs_client *clp = server->nfs_client;
6b30954e 1053 int ret;
58d9714a 1054
6b30954e 1055 for (;;) {
65de872e 1056 ret = nfs4_wait_clnt_recover(clp);
6b30954e
TM		 1057 if (ret != 0)
1058 return ret;
e598d843
TM		 1059 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1060 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
6b30954e 1061 break;
58d9714a 1062 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 1063 }
1064 return 0;
58d9714a
TM		 1065}
1066
1da177e4
LT		 1067/*
1068 * OPEN_EXPIRED:
1069 * reclaim state on the server after a network partition.
1070 * Assumes caller holds the appropriate lock
1071 */
539cd03a 1072static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 1073{
e56e0b78 1074 struct nfs4_opendata *opendata;
864472e9 1075 int ret;
1da177e4 1076
6f220ed5
TM		 1077 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1078 if (IS_ERR(opendata))
1079 return PTR_ERR(opendata);
864472e9 1080 ret = nfs4_open_recover(opendata, state);
35d05778 1081 if (ret == -ESTALE)
539cd03a 1082 d_drop(ctx->path.dentry);
c6d00e63 1083 nfs4_opendata_put(opendata);
864472e9 1084 return ret;
1da177e4
LT		 1085}
1086
539cd03a 1087static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 1088{
539cd03a 1089 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 1090 struct nfs4_exception exception = { };
1091 int err;
1092
1093 do {
539cd03a 1094 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 1095 if (err == -NFS4ERR_DELAY)
1096 nfs4_handle_exception(server, err, &exception);
1097 } while (exception.retry);
1098 return err;
1099}
1100
1da177e4
LT		 1101static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1102{
1da177e4 1103 struct nfs_open_context *ctx;
864472e9 1104 int ret;
1da177e4 1105
864472e9
TM		 1106 ctx = nfs4_state_find_open_context(state);
1107 if (IS_ERR(ctx))
1108 return PTR_ERR(ctx);
539cd03a 1109 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1110 put_nfs_open_context(ctx);
1111 return ret;
1da177e4
LT		 1112}
1113
aa53ed54
JL		 1114/*
1115 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1116 * fields corresponding to attributes that were used to store the verifier.
1117 * Make sure we clobber those fields in the later setattr call
1118 */
1119static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1120{
1121 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1122 !(sattr->ia_valid & ATTR_ATIME_SET))
1123 sattr->ia_valid |= ATTR_ATIME;
1124
1125 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1126 !(sattr->ia_valid & ATTR_MTIME_SET))
1127 sattr->ia_valid |= ATTR_MTIME;
1128}
1129
1da177e4 1130/*
24ac23ab 1131 * Returns a referenced nfs4_state
1da177e4 1132 */
ad389da7 1133static 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		 1134{
1135 struct nfs4_state_owner *sp;
1136 struct nfs4_state *state = NULL;
1137 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 1138 struct nfs_client *clp = server->nfs_client;
e56e0b78 1139 struct nfs4_opendata *opendata;
aac00a8d 1140 int status;
1da177e4
LT		 1141
1142 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1143 status = -ENOMEM;
1144 if (!(sp = nfs4_get_state_owner(server, cred))) {
1145 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1146 goto out_err;
1147 }
58d9714a
TM		 1148 status = nfs4_recover_expired_lease(server);
1149 if (status != 0)
b4454fe1 1150 goto err_put_state_owner;
aac00a8d
TM		 1151 if (path->dentry->d_inode != NULL)
1152 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a
TM		 1153 down_read(&clp->cl_sem);
1154 status = -ENOMEM;
ad389da7 1155 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1156 if (opendata == NULL)
76723de0 1157 goto err_release_rwsem;
1da177e4 1158
aac00a8d
TM		 1159 if (path->dentry->d_inode != NULL)
1160 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1161
24ac23ab 1162 status = _nfs4_proc_open(opendata);
1da177e4 1163 if (status != 0)
c6d00e63 1164 goto err_opendata_put;
1da177e4 1165
aa53ed54
JL		 1166 if (opendata->o_arg.open_flags & O_EXCL)
1167 nfs4_exclusive_attrset(opendata, sattr);
1168
24ac23ab 1169 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1170 status = PTR_ERR(state);
1171 if (IS_ERR(state))
c6d00e63 1172 goto err_opendata_put;
c6d00e63 1173 nfs4_opendata_put(opendata);
1da177e4
LT		 1174 nfs4_put_state_owner(sp);
1175 up_read(&clp->cl_sem);
1176 *res = state;
1177 return 0;
c6d00e63
TM		 1178err_opendata_put:
1179 nfs4_opendata_put(opendata);
76723de0
TM		 1180err_release_rwsem:
1181 up_read(&clp->cl_sem);
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:
1332 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1333 break;
1334 default:
1335 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1336 rpc_restart_call(task);
1337 return;
1338 }
1339 }
516a6af6 1340 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1341}
1342
4ce70ada 1343static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1344{
4ce70ada 1345 struct nfs4_closedata *calldata = data;
9512135d 1346 struct nfs4_state *state = calldata->state;
003707c7 1347 int clear_rd, clear_wr, clear_rdwr;
9512135d 1348
963d8fe5 1349 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1350 return;
003707c7 1351
003707c7 1352 clear_rd = clear_wr = clear_rdwr = 0;
4cecb76f 1353 spin_lock(&state->owner->so_lock);
003707c7 1354 /* Calculate the change in open mode */
e7616923 1355 if (state->n_rdwr == 0) {
003707c7 1356 if (state->n_rdonly == 0) {
003707c7
TM		 1357 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1358 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1359 }
1360 if (state->n_wronly == 0) {
003707c7
TM		 1361 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1362 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1363 }
e7616923 1364 }
4cecb76f 1365 spin_unlock(&state->owner->so_lock);
003707c7 1366 if (!clear_rd && !clear_wr && !clear_rdwr) {
963d8fe5
TM		 1367 /* Note: exit _without_ calling nfs4_close_done */
1368 task->tk_action = NULL;
9512135d
TM		 1369 return;
1370 }
516a6af6 1371 nfs_fattr_init(calldata->res.fattr);
45328c35 1372 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
5138fde0 1373 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1374 calldata->arg.open_flags = FMODE_READ;
1375 } else if (test_bit(NFS_O_WRONLY_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_WRITE;
1378 }
26e976a8 1379 calldata->timestamp = jiffies;
5138fde0 1380 rpc_call_start(task);
1da177e4
LT		 1381}
1382
963d8fe5 1383static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1384 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1385 .rpc_call_done = nfs4_close_done,
1386 .rpc_release = nfs4_free_closedata,
1387};
1388
1da177e4
LT		 1389/*
1390 * It is possible for data to be read/written from a mem-mapped file
1391 * after the sys_close call (which hits the vfs layer as a flush).
1392 * This means that we can't safely call nfsv4 close on a file until
1393 * the inode is cleared. This in turn means that we are not good
1394 * NFSv4 citizens - we do not indicate to the server to update the file's
1395 * share state even when we are done with one of the three share
1396 * stateid's in the inode.
1397 *
1398 * NOTE: Caller must be holding the sp->so_owner semaphore!
1399 */
a49c3c77 1400int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1da177e4 1401{
4a35bd41 1402 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4 1403 struct nfs4_closedata *calldata;
b39e625b
TM		 1404 struct nfs4_state_owner *sp = state->owner;
1405 struct rpc_task *task;
5138fde0
TM		 1406 struct rpc_message msg = {
1407 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1408 .rpc_cred = state->owner->so_cred,
1409 };
c970aa85
TM		 1410 struct rpc_task_setup task_setup_data = {
1411 .rpc_client = server->client,
5138fde0 1412 .rpc_message = &msg,
c970aa85 1413 .callback_ops = &nfs4_close_ops,
101070ca 1414 .workqueue = nfsiod_workqueue,
c970aa85
TM		 1415 .flags = RPC_TASK_ASYNC,
1416 };
9512135d 1417 int status = -ENOMEM;
1da177e4 1418
9512135d 1419 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1420 if (calldata == NULL)
9512135d 1421 goto out;
4a35bd41 1422 calldata->inode = state->inode;
1da177e4 1423 calldata->state = state;
4a35bd41 1424 calldata->arg.fh = NFS_FH(state->inode);
003707c7 1425 calldata->arg.stateid = &state->open_stateid;
1da177e4 1426 /* Serialization for the sequence id */
cee54fc9 1427 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1428 if (calldata->arg.seqid == NULL)
1429 goto out_free_calldata;
516a6af6
TM		 1430 calldata->arg.bitmask = server->attr_bitmask;
1431 calldata->res.fattr = &calldata->fattr;
c1d51931 1432 calldata->res.seqid = calldata->arg.seqid;
516a6af6 1433 calldata->res.server = server;
4a35bd41
TM		 1434 calldata->path.mnt = mntget(path->mnt);
1435 calldata->path.dentry = dget(path->dentry);
9512135d 1436
5138fde0
TM		 1437 msg.rpc_argp = &calldata->arg,
1438 msg.rpc_resp = &calldata->res,
c970aa85
TM		 1439 task_setup_data.callback_data = calldata;
1440 task = rpc_run_task(&task_setup_data);
b39e625b
TM		 1441 if (IS_ERR(task))
1442 return PTR_ERR(task);
a49c3c77
TM		 1443 status = 0;
1444 if (wait)
1445 status = rpc_wait_for_completion_task(task);
b39e625b 1446 rpc_put_task(task);
a49c3c77 1447 return status;
9512135d
TM		 1448out_free_calldata:
1449 kfree(calldata);
1450out:
b39e625b
TM		 1451 nfs4_put_open_state(state);
1452 nfs4_put_state_owner(sp);
9512135d 1453 return status;
1da177e4
LT		 1454}
1455
4a35bd41 1456static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
02a913a7
TM		 1457{
1458 struct file *filp;
1b45c46c 1459 int ret;
02a913a7 1460
1b45c46c
TM		 1461 /* If the open_intent is for execute, we have an extra check to make */
1462 if (nd->intent.open.flags & FMODE_EXEC) {
af22f94a 1463 ret = nfs_may_open(state->inode,
1b45c46c
TM		 1464 state->owner->so_cred,
1465 nd->intent.open.flags);
1466 if (ret < 0)
1467 goto out_close;
1468 }
4a35bd41 1469 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
02a913a7
TM		 1470 if (!IS_ERR(filp)) {
1471 struct nfs_open_context *ctx;
cd3758e3 1472 ctx = nfs_file_open_context(filp);
02a913a7 1473 ctx->state = state;
95cf959b
TM		 1474 return 0;
1475 }
1b45c46c
TM		 1476 ret = PTR_ERR(filp);
1477out_close:
a49c3c77 1478 nfs4_close_sync(path, state, nd->intent.open.flags);
1b45c46c 1479 return ret;
02a913a7
TM		 1480}
1481
1482struct dentry *
1da177e4
LT		 1483nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1484{
ad389da7 1485 struct path path = {
4ac91378 1486 .mnt = nd->path.mnt,
ad389da7
TM		 1487 .dentry = dentry,
1488 };
4ac91378 1489 struct dentry *parent;
1da177e4
LT		 1490 struct iattr attr;
1491 struct rpc_cred *cred;
1492 struct nfs4_state *state;
02a913a7 1493 struct dentry *res;
1da177e4
LT		 1494
1495 if (nd->flags & LOOKUP_CREATE) {
1496 attr.ia_mode = nd->intent.open.create_mode;
1497 attr.ia_valid = ATTR_MODE;
1498 if (!IS_POSIXACL(dir))
1499 attr.ia_mode &= ~current->fs->umask;
1500 } else {
1501 attr.ia_valid = 0;
1502 BUG_ON(nd->intent.open.flags & O_CREAT);
1503 }
1504
98a8e323 1505 cred = rpc_lookup_cred();
1da177e4 1506 if (IS_ERR(cred))
02a913a7 1507 return (struct dentry *)cred;
565277f6
TM		 1508 parent = dentry->d_parent;
1509 /* Protect against concurrent sillydeletes */
1510 nfs_block_sillyrename(parent);
ad389da7 1511 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1512 put_rpccred(cred);
02a913a7 1513 if (IS_ERR(state)) {
d75340cc 1514 if (PTR_ERR(state) == -ENOENT) {
02a913a7 1515 d_add(dentry, NULL);
d75340cc
TM		 1516 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1517 }
565277f6 1518 nfs_unblock_sillyrename(parent);
02a913a7
TM		 1519 return (struct dentry *)state;
1520 }
24ac23ab 1521 res = d_add_unique(dentry, igrab(state->inode));
02a913a7 1522 if (res != NULL)
deee9369 1523 path.dentry = res;
d75340cc 1524 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
565277f6 1525 nfs_unblock_sillyrename(parent);
4a35bd41 1526 nfs4_intent_set_file(nd, &path, state);
02a913a7 1527 return res;
1da177e4
LT		 1528}
1529
1530int
02a913a7 1531nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1532{
ad389da7 1533 struct path path = {
4ac91378 1534 .mnt = nd->path.mnt,
ad389da7
TM		 1535 .dentry = dentry,
1536 };
1da177e4
LT		 1537 struct rpc_cred *cred;
1538 struct nfs4_state *state;
1da177e4 1539
98a8e323 1540 cred = rpc_lookup_cred();
1da177e4
LT		 1541 if (IS_ERR(cred))
1542 return PTR_ERR(cred);
aac00a8d 1543 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1544 put_rpccred(cred);
02a913a7
TM		 1545 if (IS_ERR(state)) {
1546 switch (PTR_ERR(state)) {
1547 case -EPERM:
1548 case -EACCES:
1549 case -EDQUOT:
1550 case -ENOSPC:
1551 case -EROFS:
1552 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1553 return 1;
b87c0adf
CL		 1554 default:
1555 goto out_drop;
02a913a7 1556 }
02a913a7 1557 }
24ac23ab 1558 if (state->inode == dentry->d_inode) {
d75340cc 1559 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
4a35bd41 1560 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1561 return 1;
1562 }
a49c3c77 1563 nfs4_close_sync(&path, state, openflags);
02a913a7
TM		 1564out_drop:
1565 d_drop(dentry);
1da177e4
LT		 1566 return 0;
1567}
1568
1569
1570static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1571{
1572 struct nfs4_server_caps_res res = {};
1573 struct rpc_message msg = {
1574 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1575 .rpc_argp = fhandle,
1576 .rpc_resp = &res,
1577 };
1578 int status;
1579
1580 status = rpc_call_sync(server->client, &msg, 0);
1581 if (status == 0) {
1582 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1583 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1584 server->caps |= NFS_CAP_ACLS;
1585 if (res.has_links != 0)
1586 server->caps |= NFS_CAP_HARDLINKS;
1587 if (res.has_symlinks != 0)
1588 server->caps |= NFS_CAP_SYMLINKS;
1589 server->acl_bitmask = res.acl_bitmask;
1590 }
1591 return status;
1592}
1593
55a97593 1594int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1595{
1596 struct nfs4_exception exception = { };
1597 int err;
1598 do {
1599 err = nfs4_handle_exception(server,
1600 _nfs4_server_capabilities(server, fhandle),
1601 &exception);
1602 } while (exception.retry);
1603 return err;
1604}
1605
1606static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1607 struct nfs_fsinfo *info)
1608{
1da177e4
LT		 1609 struct nfs4_lookup_root_arg args = {
1610 .bitmask = nfs4_fattr_bitmap,
1611 };
1612 struct nfs4_lookup_res res = {
1613 .server = server,
0e574af1 1614 .fattr = info->fattr,
1da177e4
LT		 1615 .fh = fhandle,
1616 };
1617 struct rpc_message msg = {
1618 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1619 .rpc_argp = &args,
1620 .rpc_resp = &res,
1621 };
0e574af1 1622 nfs_fattr_init(info->fattr);
1da177e4
LT		 1623 return rpc_call_sync(server->client, &msg, 0);
1624}
1625
1626static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1627 struct nfs_fsinfo *info)
1628{
1629 struct nfs4_exception exception = { };
1630 int err;
1631 do {
1632 err = nfs4_handle_exception(server,
1633 _nfs4_lookup_root(server, fhandle, info),
1634 &exception);
1635 } while (exception.retry);
1636 return err;
1637}
1638
54ceac45
DH		 1639/*
1640 * get the file handle for the "/" directory on the server
1641 */
1da177e4 1642static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1643 struct nfs_fsinfo *info)
1da177e4 1644{
1da177e4
LT		 1645 int status;
1646
1da177e4 1647 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1648 if (status == 0)
1649 status = nfs4_server_capabilities(server, fhandle);
1650 if (status == 0)
1651 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1652 return nfs4_map_errors(status);
1da177e4
LT		 1653}
1654
6b97fd3d
MN		 1655/*
1656 * Get locations and (maybe) other attributes of a referral.
1657 * Note that we'll actually follow the referral later when
1658 * we detect fsid mismatch in inode revalidation
1659 */
56659e99 1660static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
6b97fd3d
MN		 1661{
1662 int status = -ENOMEM;
1663 struct page *page = NULL;
1664 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1665
1666 page = alloc_page(GFP_KERNEL);
1667 if (page == NULL)
1668 goto out;
1669 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1670 if (locations == NULL)
1671 goto out;
1672
c228fd3a 1673 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1674 if (status != 0)
1675 goto out;
1676 /* Make sure server returned a different fsid for the referral */
1677 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3110ff80 1678 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
6b97fd3d
MN		 1679 status = -EIO;
1680 goto out;
1681 }
1682
1683 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1684 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1685 if (!fattr->mode)
1686 fattr->mode = S_IFDIR;
1687 memset(fhandle, 0, sizeof(struct nfs_fh));
1688out:
1689 if (page)
1690 __free_page(page);
1691 if (locations)
1692 kfree(locations);
1693 return status;
1694}
1695
1da177e4
LT		 1696static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1697{
1698 struct nfs4_getattr_arg args = {
1699 .fh = fhandle,
1700 .bitmask = server->attr_bitmask,
1701 };
1702 struct nfs4_getattr_res res = {
1703 .fattr = fattr,
1704 .server = server,
1705 };
1706 struct rpc_message msg = {
1707 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1708 .rpc_argp = &args,
1709 .rpc_resp = &res,
1710 };
1711
0e574af1 1712 nfs_fattr_init(fattr);
1da177e4
LT		 1713 return rpc_call_sync(server->client, &msg, 0);
1714}
1715
1716static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1717{
1718 struct nfs4_exception exception = { };
1719 int err;
1720 do {
1721 err = nfs4_handle_exception(server,
1722 _nfs4_proc_getattr(server, fhandle, fattr),
1723 &exception);
1724 } while (exception.retry);
1725 return err;
1726}
1727
1728/*
1729 * The file is not closed if it is opened due to the a request to change
1730 * the size of the file. The open call will not be needed once the
1731 * VFS layer lookup-intents are implemented.
1732 *
1733 * Close is called when the inode is destroyed.
1734 * If we haven't opened the file for O_WRONLY, we
1735 * need to in the size_change case to obtain a stateid.
1736 *
1737 * Got race?
1738 * Because OPEN is always done by name in nfsv4, it is
1739 * possible that we opened a different file by the same
1740 * name. We can recognize this race condition, but we
1741 * can't do anything about it besides returning an error.
1742 *
1743 * This will be fixed with VFS changes (lookup-intent).
1744 */
1745static int
1746nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1747 struct iattr *sattr)
1748{
08e9eac4 1749 struct inode *inode = dentry->d_inode;
659bfcd6 1750 struct rpc_cred *cred = NULL;
d530838b 1751 struct nfs4_state *state = NULL;
1da177e4
LT		 1752 int status;
1753
0e574af1 1754 nfs_fattr_init(fattr);
1da177e4 1755
d530838b 1756 /* Search for an existing open(O_WRITE) file */
659bfcd6
TM		 1757 if (sattr->ia_valid & ATTR_FILE) {
1758 struct nfs_open_context *ctx;
1759
1760 ctx = nfs_file_open_context(sattr->ia_file);
504e5189
NB		 1761 if (ctx) {
1762 cred = ctx->cred;
1763 state = ctx->state;
1764 }
659bfcd6 1765 }
08e9eac4 1766
659bfcd6 1767 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
65e4308d
TM		 1768 if (status == 0)
1769 nfs_setattr_update_inode(inode, sattr);
1da177e4
LT		 1770 return status;
1771}
1772
56659e99
TM		 1773static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1774 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1775 struct nfs_fattr *fattr)
1776{
1777 int status;
1778 struct nfs4_lookup_arg args = {
1779 .bitmask = server->attr_bitmask,
1780 .dir_fh = dirfh,
1781 .name = name,
1782 };
1783 struct nfs4_lookup_res res = {
1784 .server = server,
1785 .fattr = fattr,
1786 .fh = fhandle,
1787 };
1788 struct rpc_message msg = {
1789 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1790 .rpc_argp = &args,
1791 .rpc_resp = &res,
1792 };
1793
1794 nfs_fattr_init(fattr);
1795
1796 dprintk("NFS call lookupfh %s\n", name->name);
1797 status = rpc_call_sync(server->client, &msg, 0);
1798 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1799 return status;
1800}
1801
1802static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1803 struct qstr *name, struct nfs_fh *fhandle,
1804 struct nfs_fattr *fattr)
1805{
1806 struct nfs4_exception exception = { };
1807 int err;
1808 do {
4e56e082
TM		 1809 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1810 /* FIXME: !!!! */
1811 if (err == -NFS4ERR_MOVED) {
1812 err = -EREMOTE;
1813 break;
1814 }
1815 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1816 } while (exception.retry);
1817 return err;
1818}
1819
56659e99 1820static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1821 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1822{
4e56e082 1823 int status;
1da177e4
LT		 1824
1825 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1826 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1827 if (status == -NFS4ERR_MOVED)
1828 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1829 dprintk("NFS reply lookup: %d\n", status);
1830 return status;
1831}
1832
1833static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1834{
1835 struct nfs4_exception exception = { };
1836 int err;
1837 do {
1838 err = nfs4_handle_exception(NFS_SERVER(dir),
1839 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1840 &exception);
1841 } while (exception.retry);
1842 return err;
1843}
1844
1845static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1846{
76b32999
TM		 1847 struct nfs_server *server = NFS_SERVER(inode);
1848 struct nfs_fattr fattr;
1da177e4
LT		 1849 struct nfs4_accessargs args = {
1850 .fh = NFS_FH(inode),
76b32999
TM		 1851 .bitmask = server->attr_bitmask,
1852 };
1853 struct nfs4_accessres res = {
1854 .server = server,
1855 .fattr = &fattr,
1da177e4 1856 };
1da177e4
LT		 1857 struct rpc_message msg = {
1858 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1859 .rpc_argp = &args,
1860 .rpc_resp = &res,
1861 .rpc_cred = entry->cred,
1862 };
1863 int mode = entry->mask;
1864 int status;
1865
1866 /*
1867 * Determine which access bits we want to ask for...
1868 */
1869 if (mode & MAY_READ)
1870 args.access |= NFS4_ACCESS_READ;
1871 if (S_ISDIR(inode->i_mode)) {
1872 if (mode & MAY_WRITE)
1873 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1874 if (mode & MAY_EXEC)
1875 args.access |= NFS4_ACCESS_LOOKUP;
1876 } else {
1877 if (mode & MAY_WRITE)
1878 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1879 if (mode & MAY_EXEC)
1880 args.access |= NFS4_ACCESS_EXECUTE;
1881 }
76b32999 1882 nfs_fattr_init(&fattr);
1da177e4
LT		 1883 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1884 if (!status) {
1885 entry->mask = 0;
1886 if (res.access & NFS4_ACCESS_READ)
1887 entry->mask |= MAY_READ;
1888 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1889 entry->mask |= MAY_WRITE;
1890 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1891 entry->mask |= MAY_EXEC;
76b32999 1892 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1893 }
1894 return status;
1895}
1896
1897static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1898{
1899 struct nfs4_exception exception = { };
1900 int err;
1901 do {
1902 err = nfs4_handle_exception(NFS_SERVER(inode),
1903 _nfs4_proc_access(inode, entry),
1904 &exception);
1905 } while (exception.retry);
1906 return err;
1907}
1908
1909/*
1910 * TODO: For the time being, we don't try to get any attributes
1911 * along with any of the zero-copy operations READ, READDIR,
1912 * READLINK, WRITE.
1913 *
1914 * In the case of the first three, we want to put the GETATTR
1915 * after the read-type operation -- this is because it is hard
1916 * to predict the length of a GETATTR response in v4, and thus
1917 * align the READ data correctly. This means that the GETATTR
1918 * may end up partially falling into the page cache, and we should
1919 * shift it into the 'tail' of the xdr_buf before processing.
1920 * To do this efficiently, we need to know the total length
1921 * of data received, which doesn't seem to be available outside
1922 * of the RPC layer.
1923 *
1924 * In the case of WRITE, we also want to put the GETATTR after
1925 * the operation -- in this case because we want to make sure
1926 * we get the post-operation mtime and size. This means that
1927 * we can't use xdr_encode_pages() as written: we need a variant
1928 * of it which would leave room in the 'tail' iovec.
1929 *
1930 * Both of these changes to the XDR layer would in fact be quite
1931 * minor, but I decided to leave them for a subsequent patch.
1932 */
1933static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1934 unsigned int pgbase, unsigned int pglen)
1935{
1936 struct nfs4_readlink args = {
1937 .fh = NFS_FH(inode),
1938 .pgbase = pgbase,
1939 .pglen = pglen,
1940 .pages = &page,
1941 };
1942 struct rpc_message msg = {
1943 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1944 .rpc_argp = &args,
1945 .rpc_resp = NULL,
1946 };
1947
1948 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1949}
1950
1951static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1952 unsigned int pgbase, unsigned int pglen)
1953{
1954 struct nfs4_exception exception = { };
1955 int err;
1956 do {
1957 err = nfs4_handle_exception(NFS_SERVER(inode),
1958 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1959 &exception);
1960 } while (exception.retry);
1961 return err;
1962}
1963
1da177e4
LT		 1964/*
1965 * Got race?
1966 * We will need to arrange for the VFS layer to provide an atomic open.
1967 * Until then, this create/open method is prone to inefficiency and race
1968 * conditions due to the lookup, create, and open VFS calls from sys_open()
1969 * placed on the wire.
1970 *
1971 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1972 * The file will be opened again in the subsequent VFS open call
1973 * (nfs4_proc_file_open).
1974 *
1975 * The open for read will just hang around to be used by any process that
1976 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1977 */
1978
1979static int
1980nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1981 int flags, struct nameidata *nd)
1da177e4 1982{
ad389da7 1983 struct path path = {
4ac91378 1984 .mnt = nd->path.mnt,
ad389da7
TM		 1985 .dentry = dentry,
1986 };
1da177e4
LT		 1987 struct nfs4_state *state;
1988 struct rpc_cred *cred;
1989 int status = 0;
1990
98a8e323 1991 cred = rpc_lookup_cred();
1da177e4
LT		 1992 if (IS_ERR(cred)) {
1993 status = PTR_ERR(cred);
1994 goto out;
1995 }
ad389da7 1996 state = nfs4_do_open(dir, &path, flags, sattr, cred);
d4d9cdcb 1997 d_drop(dentry);
1da177e4
LT		 1998 if (IS_ERR(state)) {
1999 status = PTR_ERR(state);
659bfcd6 2000 goto out_putcred;
1da177e4 2001 }
d4d9cdcb 2002 d_add(dentry, igrab(state->inode));
d75340cc 2003 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 2004 if (flags & O_EXCL) {
2005 struct nfs_fattr fattr;
659bfcd6 2006 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
02a913a7 2007 if (status == 0)
65e4308d 2008 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 2009 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 2010 }
ad389da7 2011 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 2012 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 2013 else
a49c3c77 2014 nfs4_close_sync(&path, state, flags);
659bfcd6
TM		 2015out_putcred:
2016 put_rpccred(cred);
1da177e4
LT		 2017out:
2018 return status;
2019}
2020
2021static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2022{
16e42959 2023 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 2024 struct nfs_removeargs args = {
1da177e4 2025 .fh = NFS_FH(dir),
4fdc17b2
TM		 2026 .name.len = name->len,
2027 .name.name = name->name,
16e42959
TM		 2028 .bitmask = server->attr_bitmask,
2029 };
4fdc17b2 2030 struct nfs_removeres res = {
16e42959 2031 .server = server,
1da177e4 2032 };
1da177e4 2033 struct rpc_message msg = {
4fdc17b2
TM		 2034 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2035 .rpc_argp = &args,
2036 .rpc_resp = &res,
1da177e4
LT		 2037 };
2038 int status;
2039
4fdc17b2 2040 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 2041 status = rpc_call_sync(server->client, &msg, 0);
2042 if (status == 0) {
2043 update_changeattr(dir, &res.cinfo);
4fdc17b2 2044 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 2045 }
1da177e4
LT		 2046 return status;
2047}
2048
2049static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2050{
2051 struct nfs4_exception exception = { };
2052 int err;
2053 do {
2054 err = nfs4_handle_exception(NFS_SERVER(dir),
2055 _nfs4_proc_remove(dir, name),
2056 &exception);
2057 } while (exception.retry);
2058 return err;
2059}
2060
e4eff1a6 2061static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 2062{
e4eff1a6
TM		 2063 struct nfs_server *server = NFS_SERVER(dir);
2064 struct nfs_removeargs *args = msg->rpc_argp;
2065 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 2066
e4eff1a6
TM		 2067 args->bitmask = server->attr_bitmask;
2068 res->server = server;
1da177e4 2069 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 2070}
2071
e4eff1a6 2072static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 2073{
e4eff1a6
TM		 2074 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2075
2076 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
2077 return 0;
2078 update_changeattr(dir, &res->cinfo);
2079 nfs_post_op_update_inode(dir, &res->dir_attr);
2080 return 1;
1da177e4
LT		 2081}
2082
2083static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2084 struct inode *new_dir, struct qstr *new_name)
2085{
6caf2c82 2086 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 2087 struct nfs4_rename_arg arg = {
2088 .old_dir = NFS_FH(old_dir),
2089 .new_dir = NFS_FH(new_dir),
2090 .old_name = old_name,
2091 .new_name = new_name,
6caf2c82
TM		 2092 .bitmask = server->attr_bitmask,
2093 };
2094 struct nfs_fattr old_fattr, new_fattr;
2095 struct nfs4_rename_res res = {
2096 .server = server,
2097 .old_fattr = &old_fattr,
2098 .new_fattr = &new_fattr,
1da177e4 2099 };
1da177e4
LT		 2100 struct rpc_message msg = {
2101 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2102 .rpc_argp = &arg,
2103 .rpc_resp = &res,
2104 };
2105 int status;
2106
6caf2c82
TM		 2107 nfs_fattr_init(res.old_fattr);
2108 nfs_fattr_init(res.new_fattr);
2109 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2110
2111 if (!status) {
2112 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2113 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2114 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2115 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2116 }
2117 return status;
2118}
2119
2120static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2121 struct inode *new_dir, struct qstr *new_name)
2122{
2123 struct nfs4_exception exception = { };
2124 int err;
2125 do {
2126 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2127 _nfs4_proc_rename(old_dir, old_name,
2128 new_dir, new_name),
2129 &exception);
2130 } while (exception.retry);
2131 return err;
2132}
2133
2134static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2135{
91ba2eee 2136 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2137 struct nfs4_link_arg arg = {
2138 .fh = NFS_FH(inode),
2139 .dir_fh = NFS_FH(dir),
2140 .name = name,
91ba2eee
TM		 2141 .bitmask = server->attr_bitmask,
2142 };
2143 struct nfs_fattr fattr, dir_attr;
2144 struct nfs4_link_res res = {
2145 .server = server,
2146 .fattr = &fattr,
2147 .dir_attr = &dir_attr,
1da177e4 2148 };
1da177e4
LT		 2149 struct rpc_message msg = {
2150 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2151 .rpc_argp = &arg,
91ba2eee 2152 .rpc_resp = &res,
1da177e4
LT		 2153 };
2154 int status;
2155
91ba2eee
TM		 2156 nfs_fattr_init(res.fattr);
2157 nfs_fattr_init(res.dir_attr);
2158 status = rpc_call_sync(server->client, &msg, 0);
2159 if (!status) {
2160 update_changeattr(dir, &res.cinfo);
2161 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2162 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2163 }
1da177e4
LT		 2164
2165 return status;
2166}
2167
2168static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2169{
2170 struct nfs4_exception exception = { };
2171 int err;
2172 do {
2173 err = nfs4_handle_exception(NFS_SERVER(inode),
2174 _nfs4_proc_link(inode, dir, name),
2175 &exception);
2176 } while (exception.retry);
2177 return err;
2178}
2179
57dc9a57
TM		 2180struct nfs4_createdata {
2181 struct rpc_message msg;
2182 struct nfs4_create_arg arg;
2183 struct nfs4_create_res res;
2184 struct nfs_fh fh;
2185 struct nfs_fattr fattr;
2186 struct nfs_fattr dir_fattr;
2187};
2188
2189static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2190 struct qstr *name, struct iattr *sattr, u32 ftype)
2191{
2192 struct nfs4_createdata *data;
2193
2194 data = kzalloc(sizeof(*data), GFP_KERNEL);
2195 if (data != NULL) {
2196 struct nfs_server *server = NFS_SERVER(dir);
2197
2198 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2199 data->msg.rpc_argp = &data->arg;
2200 data->msg.rpc_resp = &data->res;
2201 data->arg.dir_fh = NFS_FH(dir);
2202 data->arg.server = server;
2203 data->arg.name = name;
2204 data->arg.attrs = sattr;
2205 data->arg.ftype = ftype;
2206 data->arg.bitmask = server->attr_bitmask;
2207 data->res.server = server;
2208 data->res.fh = &data->fh;
2209 data->res.fattr = &data->fattr;
2210 data->res.dir_fattr = &data->dir_fattr;
2211 nfs_fattr_init(data->res.fattr);
2212 nfs_fattr_init(data->res.dir_fattr);
2213 }
2214 return data;
2215}
2216
2217static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2218{
2219 int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2220 if (status == 0) {
2221 update_changeattr(dir, &data->res.dir_cinfo);
2222 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2223 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2224 }
2225 return status;
2226}
2227
2228static void nfs4_free_createdata(struct nfs4_createdata *data)
2229{
2230 kfree(data);
2231}
2232
4f390c15 2233static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2234 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4 2235{
57dc9a57
TM		 2236 struct nfs4_createdata *data;
2237 int status = -ENAMETOOLONG;
1da177e4 2238
94a6d753 2239 if (len > NFS4_MAXPATHLEN)
57dc9a57 2240 goto out;
4f390c15 2241
57dc9a57
TM		 2242 status = -ENOMEM;
2243 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2244 if (data == NULL)
2245 goto out;
2246
2247 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2248 data->arg.u.symlink.pages = &page;
2249 data->arg.u.symlink.len = len;
1da177e4 2250
57dc9a57
TM		 2251 status = nfs4_do_create(dir, dentry, data);
2252
2253 nfs4_free_createdata(data);
2254out:
1da177e4
LT		 2255 return status;
2256}
2257
4f390c15 2258static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2259 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2260{
2261 struct nfs4_exception exception = { };
2262 int err;
2263 do {
2264 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2265 _nfs4_proc_symlink(dir, dentry, page,
2266 len, sattr),
1da177e4
LT		 2267 &exception);
2268 } while (exception.retry);
2269 return err;
2270}
2271
2272static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2273 struct iattr *sattr)
2274{
57dc9a57
TM		 2275 struct nfs4_createdata *data;
2276 int status = -ENOMEM;
1da177e4 2277
57dc9a57
TM		 2278 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2279 if (data == NULL)
2280 goto out;
2281
2282 status = nfs4_do_create(dir, dentry, data);
2283
2284 nfs4_free_createdata(data);
2285out:
1da177e4
LT		 2286 return status;
2287}
2288
2289static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2290 struct iattr *sattr)
2291{
2292 struct nfs4_exception exception = { };
2293 int err;
2294 do {
2295 err = nfs4_handle_exception(NFS_SERVER(dir),
2296 _nfs4_proc_mkdir(dir, dentry, sattr),
2297 &exception);
2298 } while (exception.retry);
2299 return err;
2300}
2301
2302static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2303 u64 cookie, struct page *page, unsigned int count, int plus)
2304{
2305 struct inode *dir = dentry->d_inode;
2306 struct nfs4_readdir_arg args = {
2307 .fh = NFS_FH(dir),
2308 .pages = &page,
2309 .pgbase = 0,
2310 .count = count,
2311 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2312 };
2313 struct nfs4_readdir_res res;
2314 struct rpc_message msg = {
2315 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2316 .rpc_argp = &args,
2317 .rpc_resp = &res,
2318 .rpc_cred = cred,
2319 };
2320 int status;
2321
3110ff80 2322 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
eadf4598
TM		 2323 dentry->d_parent->d_name.name,
2324 dentry->d_name.name,
2325 (unsigned long long)cookie);
1da177e4
LT		 2326 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2327 res.pgbase = args.pgbase;
2328 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2329 if (status == 0)
2330 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2331
2332 nfs_invalidate_atime(dir);
2333
3110ff80 2334 dprintk("%s: returns %d\n", __func__, status);
1da177e4
LT		 2335 return status;
2336}
2337
2338static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2339 u64 cookie, struct page *page, unsigned int count, int plus)
2340{
2341 struct nfs4_exception exception = { };
2342 int err;
2343 do {
2344 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2345 _nfs4_proc_readdir(dentry, cred, cookie,
2346 page, count, plus),
2347 &exception);
2348 } while (exception.retry);
2349 return err;
2350}
2351
2352static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2353 struct iattr *sattr, dev_t rdev)
2354{
57dc9a57
TM		 2355 struct nfs4_createdata *data;
2356 int mode = sattr->ia_mode;
2357 int status = -ENOMEM;
1da177e4
LT		 2358
2359 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2360 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
57dc9a57
TM		 2361
2362 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2363 if (data == NULL)
2364 goto out;
2365
1da177e4 2366 if (S_ISFIFO(mode))
57dc9a57 2367 data->arg.ftype = NF4FIFO;
1da177e4 2368 else if (S_ISBLK(mode)) {
57dc9a57
TM		 2369 data->arg.ftype = NF4BLK;
2370 data->arg.u.device.specdata1 = MAJOR(rdev);
2371 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4
LT		 2372 }
2373 else if (S_ISCHR(mode)) {
57dc9a57
TM		 2374 data->arg.ftype = NF4CHR;
2375 data->arg.u.device.specdata1 = MAJOR(rdev);
2376 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4 2377 }
1da177e4 2378
57dc9a57
TM		 2379 status = nfs4_do_create(dir, dentry, data);
2380
2381 nfs4_free_createdata(data);
2382out:
1da177e4
LT		 2383 return status;
2384}
2385
2386static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2387 struct iattr *sattr, dev_t rdev)
2388{
2389 struct nfs4_exception exception = { };
2390 int err;
2391 do {
2392 err = nfs4_handle_exception(NFS_SERVER(dir),
2393 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2394 &exception);
2395 } while (exception.retry);
2396 return err;
2397}
2398
2399static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2400 struct nfs_fsstat *fsstat)
2401{
2402 struct nfs4_statfs_arg args = {
2403 .fh = fhandle,
2404 .bitmask = server->attr_bitmask,
2405 };
2406 struct rpc_message msg = {
2407 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2408 .rpc_argp = &args,
2409 .rpc_resp = fsstat,
2410 };
2411
0e574af1 2412 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2413 return rpc_call_sync(server->client, &msg, 0);
2414}
2415
2416static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2417{
2418 struct nfs4_exception exception = { };
2419 int err;
2420 do {
2421 err = nfs4_handle_exception(server,
2422 _nfs4_proc_statfs(server, fhandle, fsstat),
2423 &exception);
2424 } while (exception.retry);
2425 return err;
2426}
2427
2428static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2429 struct nfs_fsinfo *fsinfo)
2430{
2431 struct nfs4_fsinfo_arg args = {
2432 .fh = fhandle,
2433 .bitmask = server->attr_bitmask,
2434 };
2435 struct rpc_message msg = {
2436 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2437 .rpc_argp = &args,
2438 .rpc_resp = fsinfo,
2439 };
2440
2441 return rpc_call_sync(server->client, &msg, 0);
2442}
2443
2444static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2445{
2446 struct nfs4_exception exception = { };
2447 int err;
2448
2449 do {
2450 err = nfs4_handle_exception(server,
2451 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2452 &exception);
2453 } while (exception.retry);
2454 return err;
2455}
2456
2457static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2458{
0e574af1 2459 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2460 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2461}
2462
2463static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2464 struct nfs_pathconf *pathconf)
2465{
2466 struct nfs4_pathconf_arg args = {
2467 .fh = fhandle,
2468 .bitmask = server->attr_bitmask,
2469 };
2470 struct rpc_message msg = {
2471 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2472 .rpc_argp = &args,
2473 .rpc_resp = pathconf,
2474 };
2475
2476 /* None of the pathconf attributes are mandatory to implement */
2477 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2478 memset(pathconf, 0, sizeof(*pathconf));
2479 return 0;
2480 }
2481
0e574af1 2482 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2483 return rpc_call_sync(server->client, &msg, 0);
2484}
2485
2486static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2487 struct nfs_pathconf *pathconf)
2488{
2489 struct nfs4_exception exception = { };
2490 int err;
2491
2492 do {
2493 err = nfs4_handle_exception(server,
2494 _nfs4_proc_pathconf(server, fhandle, pathconf),
2495 &exception);
2496 } while (exception.retry);
2497 return err;
2498}
2499
ec06c096 2500static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2501{
ec06c096 2502 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2503
ec06c096 2504 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2505 rpc_restart_call(task);
ec06c096 2506 return -EAGAIN;
1da177e4 2507 }
8850df99
TM		 2508
2509 nfs_invalidate_atime(data->inode);
1da177e4 2510 if (task->tk_status > 0)
ec06c096
TM		 2511 renew_lease(server, data->timestamp);
2512 return 0;
1da177e4
LT		 2513}
2514
bdc7f021 2515static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
1da177e4 2516{
1da177e4 2517 data->timestamp = jiffies;
bdc7f021 2518 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
1da177e4
LT		 2519}
2520
788e7a89 2521static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2522{
1da177e4
LT		 2523 struct inode *inode = data->inode;
2524
2525 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2526 rpc_restart_call(task);
788e7a89 2527 return -EAGAIN;
1da177e4 2528 }
4f9838c7 2529 if (task->tk_status >= 0) {
1da177e4 2530 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2531 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2532 }
788e7a89 2533 return 0;
1da177e4
LT		 2534}
2535
bdc7f021 2536static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2537{
bdc7f021
TM		 2538 struct nfs_server *server = NFS_SERVER(data->inode);
2539
4f9838c7
TM		 2540 data->args.bitmask = server->attr_bitmask;
2541 data->res.server = server;
1da177e4
LT		 2542 data->timestamp = jiffies;
2543
bdc7f021 2544 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
1da177e4
LT		 2545}
2546
788e7a89 2547static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2548{
1da177e4
LT		 2549 struct inode *inode = data->inode;
2550
2551 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2552 rpc_restart_call(task);
788e7a89 2553 return -EAGAIN;
1da177e4 2554 }
9e08a3c5 2555 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2556 return 0;
1da177e4
LT		 2557}
2558
bdc7f021 2559static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2560{
788e7a89 2561 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2562
4f9838c7
TM		 2563 data->args.bitmask = server->attr_bitmask;
2564 data->res.server = server;
bdc7f021 2565 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
1da177e4
LT		 2566}
2567
2568/*
2569 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2570 * standalone procedure for queueing an asynchronous RENEW.
2571 */
963d8fe5 2572static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2573{
adfa6f98 2574 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2575 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2576
2577 if (task->tk_status < 0) {
2578 switch (task->tk_status) {
2579 case -NFS4ERR_STALE_CLIENTID:
2580 case -NFS4ERR_EXPIRED:
2581 case -NFS4ERR_CB_PATH_DOWN:
2582 nfs4_schedule_state_recovery(clp);
2583 }
2584 return;
2585 }
2586 spin_lock(&clp->cl_lock);
2587 if (time_before(clp->cl_last_renewal,timestamp))
2588 clp->cl_last_renewal = timestamp;
2589 spin_unlock(&clp->cl_lock);
2590}
2591
963d8fe5
TM		 2592static const struct rpc_call_ops nfs4_renew_ops = {
2593 .rpc_call_done = nfs4_renew_done,
2594};
2595
adfa6f98 2596int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2597{
2598 struct rpc_message msg = {
2599 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2600 .rpc_argp = clp,
b4454fe1 2601 .rpc_cred = cred,
1da177e4
LT		 2602 };
2603
2604 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2605 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2606}
2607
adfa6f98 2608int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2609{
2610 struct rpc_message msg = {
2611 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2612 .rpc_argp = clp,
b4454fe1 2613 .rpc_cred = cred,
1da177e4
LT		 2614 };
2615 unsigned long now = jiffies;
2616 int status;
2617
2618 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2619 if (status < 0)
2620 return status;
2621 spin_lock(&clp->cl_lock);
2622 if (time_before(clp->cl_last_renewal,now))
2623 clp->cl_last_renewal = now;
2624 spin_unlock(&clp->cl_lock);
2625 return 0;
2626}
2627
aa1870af
BF		 2628static inline int nfs4_server_supports_acls(struct nfs_server *server)
2629{
2630 return (server->caps & NFS_CAP_ACLS)
2631 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2632 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2633}
2634
2635/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2636 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2637 * the stack.
2638 */
2639#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2640
2641static void buf_to_pages(const void *buf, size_t buflen,
2642 struct page **pages, unsigned int *pgbase)
2643{
2644 const void *p = buf;
2645
2646 *pgbase = offset_in_page(buf);
2647 p -= *pgbase;
2648 while (p < buf + buflen) {
2649 *(pages++) = virt_to_page(p);
2650 p += PAGE_CACHE_SIZE;
2651 }
2652}
2653
e50a1c2e
BF		 2654struct nfs4_cached_acl {
2655 int cached;
2656 size_t len;
3e9d4154 2657 char data[0];
e50a1c2e
BF		 2658};
2659
2660static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2661{
2662 struct nfs_inode *nfsi = NFS_I(inode);
2663
2664 spin_lock(&inode->i_lock);
2665 kfree(nfsi->nfs4_acl);
2666 nfsi->nfs4_acl = acl;
2667 spin_unlock(&inode->i_lock);
2668}
2669
2670static void nfs4_zap_acl_attr(struct inode *inode)
2671{
2672 nfs4_set_cached_acl(inode, NULL);
2673}
2674
2675static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2676{
2677 struct nfs_inode *nfsi = NFS_I(inode);
2678 struct nfs4_cached_acl *acl;
2679 int ret = -ENOENT;
2680
2681 spin_lock(&inode->i_lock);
2682 acl = nfsi->nfs4_acl;
2683 if (acl == NULL)
2684 goto out;
2685 if (buf == NULL) /* user is just asking for length */
2686 goto out_len;
2687 if (acl->cached == 0)
2688 goto out;
2689 ret = -ERANGE; /* see getxattr(2) man page */
2690 if (acl->len > buflen)
2691 goto out;
2692 memcpy(buf, acl->data, acl->len);
2693out_len:
2694 ret = acl->len;
2695out:
2696 spin_unlock(&inode->i_lock);
2697 return ret;
2698}
2699
2700static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2701{
2702 struct nfs4_cached_acl *acl;
2703
2704 if (buf && acl_len <= PAGE_SIZE) {
2705 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2706 if (acl == NULL)
2707 goto out;
2708 acl->cached = 1;
2709 memcpy(acl->data, buf, acl_len);
2710 } else {
2711 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2712 if (acl == NULL)
2713 goto out;
2714 acl->cached = 0;
2715 }
2716 acl->len = acl_len;
2717out:
2718 nfs4_set_cached_acl(inode, acl);
2719}
2720
16b4289c 2721static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2722{
aa1870af
BF		 2723 struct page *pages[NFS4ACL_MAXPAGES];
2724 struct nfs_getaclargs args = {
2725 .fh = NFS_FH(inode),
2726 .acl_pages = pages,
2727 .acl_len = buflen,
2728 };
2729 size_t resp_len = buflen;
e50a1c2e 2730 void *resp_buf;
aa1870af
BF		 2731 struct rpc_message msg = {
2732 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2733 .rpc_argp = &args,
2734 .rpc_resp = &resp_len,
2735 };
e50a1c2e 2736 struct page *localpage = NULL;
aa1870af
BF		 2737 int ret;
2738
e50a1c2e
BF		 2739 if (buflen < PAGE_SIZE) {
2740 /* As long as we're doing a round trip to the server anyway,
2741 * let's be prepared for a page of acl data. */
2742 localpage = alloc_page(GFP_KERNEL);
2743 resp_buf = page_address(localpage);
2744 if (localpage == NULL)
2745 return -ENOMEM;
2746 args.acl_pages[0] = localpage;
2747 args.acl_pgbase = 0;
1d95db8e 2748 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2749 } else {
2750 resp_buf = buf;
2751 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2752 }
aa1870af 2753 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2754 if (ret)
2755 goto out_free;
2756 if (resp_len > args.acl_len)
2757 nfs4_write_cached_acl(inode, NULL, resp_len);
2758 else
2759 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2760 if (buf) {
2761 ret = -ERANGE;
2762 if (resp_len > buflen)
2763 goto out_free;
2764 if (localpage)
2765 memcpy(buf, resp_buf, resp_len);
2766 }
2767 ret = resp_len;
2768out_free:
2769 if (localpage)
2770 __free_page(localpage);
aa1870af
BF		 2771 return ret;
2772}
2773
16b4289c
TM		 2774static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2775{
2776 struct nfs4_exception exception = { };
2777 ssize_t ret;
2778 do {
2779 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2780 if (ret >= 0)
2781 break;
2782 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2783 } while (exception.retry);
2784 return ret;
2785}
2786
e50a1c2e
BF		 2787static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2788{
2789 struct nfs_server *server = NFS_SERVER(inode);
2790 int ret;
2791
2792 if (!nfs4_server_supports_acls(server))
2793 return -EOPNOTSUPP;
2794 ret = nfs_revalidate_inode(server, inode);
2795 if (ret < 0)
2796 return ret;
f41f7418
TM		 2797 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2798 nfs_zap_acl_cache(inode);
e50a1c2e
BF		 2799 ret = nfs4_read_cached_acl(inode, buf, buflen);
2800 if (ret != -ENOENT)
2801 return ret;
2802 return nfs4_get_acl_uncached(inode, buf, buflen);
2803}
2804
16b4289c 2805static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2806{
2807 struct nfs_server *server = NFS_SERVER(inode);
2808 struct page *pages[NFS4ACL_MAXPAGES];
2809 struct nfs_setaclargs arg = {
2810 .fh = NFS_FH(inode),
2811 .acl_pages = pages,
2812 .acl_len = buflen,
2813 };
2814 struct rpc_message msg = {
2815 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2816 .rpc_argp = &arg,
2817 .rpc_resp = NULL,
2818 };
2819 int ret;
2820
2821 if (!nfs4_server_supports_acls(server))
2822 return -EOPNOTSUPP;
642ac549 2823 nfs_inode_return_delegation(inode);
4b580ee3 2824 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2825 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
f41f7418
TM		 2826 nfs_access_zap_cache(inode);
2827 nfs_zap_acl_cache(inode);
4b580ee3
BF		 2828 return ret;
2829}
2830
16b4289c
TM		 2831static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2832{
2833 struct nfs4_exception exception = { };
2834 int err;
2835 do {
2836 err = nfs4_handle_exception(NFS_SERVER(inode),
2837 __nfs4_proc_set_acl(inode, buf, buflen),
2838 &exception);
2839 } while (exception.retry);
2840 return err;
2841}
2842
1da177e4 2843static int
faf5f49c 2844nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2845{
7539bbab 2846 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2847
2848 if (!clp || task->tk_status >= 0)
2849 return 0;
2850 switch(task->tk_status) {
2851 case -NFS4ERR_STALE_CLIENTID:
2852 case -NFS4ERR_STALE_STATEID:
2853 case -NFS4ERR_EXPIRED:
5d00837b 2854 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
1da177e4 2855 nfs4_schedule_state_recovery(clp);
433fbe4c 2856 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
fda13939 2857 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
1da177e4
LT		 2858 task->tk_status = 0;
2859 return -EAGAIN;
1da177e4 2860 case -NFS4ERR_DELAY:
2e96d286 2861 nfs_inc_server_stats(server, NFSIOS_DELAY);
006ea73e 2862 case -NFS4ERR_GRACE:
1da177e4
LT		 2863 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2864 task->tk_status = 0;
2865 return -EAGAIN;
2866 case -NFS4ERR_OLD_STATEID:
2867 task->tk_status = 0;
2868 return -EAGAIN;
2869 }
2870 task->tk_status = nfs4_map_errors(task->tk_status);
2871 return 0;
2872}
2873
adfa6f98 2874int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2875{
2876 nfs4_verifier sc_verifier;
2877 struct nfs4_setclientid setclientid = {
2878 .sc_verifier = &sc_verifier,
2879 .sc_prog = program,
2880 };
2881 struct rpc_message msg = {
2882 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2883 .rpc_argp = &setclientid,
2884 .rpc_resp = clp,
286d7d6a 2885 .rpc_cred = cred,
1da177e4 2886 };
bc4785cd 2887 __be32 *p;
1da177e4
LT		 2888 int loop = 0;
2889 int status;
2890
bc4785cd 2891 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2892 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2893 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2894
2895 for(;;) {
2896 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
69dd716c 2897 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
d4d3c507
CL		 2898 clp->cl_ipaddr,
2899 rpc_peeraddr2str(clp->cl_rpcclient,
2900 RPC_DISPLAY_ADDR),
69dd716c
TM		 2901 rpc_peeraddr2str(clp->cl_rpcclient,
2902 RPC_DISPLAY_PROTO),
78ea323b 2903 clp->cl_rpcclient->cl_auth->au_ops->au_name,
1da177e4
LT		 2904 clp->cl_id_uniquifier);
2905 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
d4d3c507
CL		 2906 sizeof(setclientid.sc_netid),
2907 rpc_peeraddr2str(clp->cl_rpcclient,
2908 RPC_DISPLAY_NETID));
1da177e4 2909 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
d4d3c507 2910 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
1da177e4
LT		 2911 clp->cl_ipaddr, port >> 8, port & 255);
2912
2913 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2914 if (status != -NFS4ERR_CLID_INUSE)
2915 break;
2916 if (signalled())
2917 break;
2918 if (loop++ & 1)
2919 ssleep(clp->cl_lease_time + 1);
2920 else
2921 if (++clp->cl_id_uniquifier == 0)
2922 break;
2923 }
2924 return status;
2925}
2926
adfa6f98 2927static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2928{
2929 struct nfs_fsinfo fsinfo;
2930 struct rpc_message msg = {
2931 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2932 .rpc_argp = clp,
2933 .rpc_resp = &fsinfo,
286d7d6a 2934 .rpc_cred = cred,
1da177e4
LT		 2935 };
2936 unsigned long now;
2937 int status;
2938
2939 now = jiffies;
2940 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2941 if (status == 0) {
2942 spin_lock(&clp->cl_lock);
2943 clp->cl_lease_time = fsinfo.lease_time * HZ;
2944 clp->cl_last_renewal = now;
2945 spin_unlock(&clp->cl_lock);
2946 }
2947 return status;
2948}
2949
adfa6f98 2950int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b 2951{
77e03677 2952 long timeout = 0;
51581f3b
TM		 2953 int err;
2954 do {
2955 err = _nfs4_proc_setclientid_confirm(clp, cred);
2956 switch (err) {
2957 case 0:
2958 return err;
2959 case -NFS4ERR_RESOURCE:
2960 /* The IBM lawyers misread another document! */
2961 case -NFS4ERR_DELAY:
2962 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2963 }
2964 } while (err == 0);
2965 return err;
2966}
2967
fe650407
TM		 2968struct nfs4_delegreturndata {
2969 struct nfs4_delegreturnargs args;
fa178f29 2970 struct nfs4_delegreturnres res;
fe650407
TM		 2971 struct nfs_fh fh;
2972 nfs4_stateid stateid;
26e976a8 2973 unsigned long timestamp;
fa178f29 2974 struct nfs_fattr fattr;
fe650407
TM		 2975 int rpc_status;
2976};
2977
fe650407
TM		 2978static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2979{
2980 struct nfs4_delegreturndata *data = calldata;
2981 data->rpc_status = task->tk_status;
26e976a8 2982 if (data->rpc_status == 0)
fa178f29 2983 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2984}
2985
2986static void nfs4_delegreturn_release(void *calldata)
2987{
fe650407
TM		 2988 kfree(calldata);
2989}
2990
c8d149f3 2991static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 2992 .rpc_call_done = nfs4_delegreturn_done,
2993 .rpc_release = nfs4_delegreturn_release,
2994};
2995
e6f81075 2996static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
fe650407
TM		 2997{
2998 struct nfs4_delegreturndata *data;
fa178f29 2999 struct nfs_server *server = NFS_SERVER(inode);
fe650407 3000 struct rpc_task *task;
5138fde0
TM		 3001 struct rpc_message msg = {
3002 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3003 .rpc_cred = cred,
3004 };
c970aa85
TM		 3005 struct rpc_task_setup task_setup_data = {
3006 .rpc_client = server->client,
5138fde0 3007 .rpc_message = &msg,
c970aa85
TM		 3008 .callback_ops = &nfs4_delegreturn_ops,
3009 .flags = RPC_TASK_ASYNC,
3010 };
e6f81075 3011 int status = 0;
fe650407
TM		 3012
3013 data = kmalloc(sizeof(*data), GFP_KERNEL);
3014 if (data == NULL)
3015 return -ENOMEM;
3016 data->args.fhandle = &data->fh;
3017 data->args.stateid = &data->stateid;
fa178f29 3018 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3019 nfs_copy_fh(&data->fh, NFS_FH(inode));
3020 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3021 data->res.fattr = &data->fattr;
3022 data->res.server = server;
5138fde0 3023 nfs_fattr_init(data->res.fattr);
26e976a8 3024 data->timestamp = jiffies;
fe650407
TM		 3025 data->rpc_status = 0;
3026
c970aa85 3027 task_setup_data.callback_data = data;
5138fde0
TM		 3028 msg.rpc_argp = &data->args,
3029 msg.rpc_resp = &data->res,
c970aa85 3030 task = rpc_run_task(&task_setup_data);
7a1218a2 3031 if (IS_ERR(task))
fe650407 3032 return PTR_ERR(task);
e6f81075
TM		 3033 if (!issync)
3034 goto out;
fe650407 3035 status = nfs4_wait_for_completion_rpc_task(task);
e6f81075
TM		 3036 if (status != 0)
3037 goto out;
3038 status = data->rpc_status;
3039 if (status != 0)
3040 goto out;
3041 nfs_refresh_inode(inode, &data->fattr);
3042out:
e6b3c4db 3043 rpc_put_task(task);
fe650407 3044 return status;
1da177e4
LT		 3045}
3046
e6f81075 3047int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
1da177e4
LT		 3048{
3049 struct nfs_server *server = NFS_SERVER(inode);
3050 struct nfs4_exception exception = { };
3051 int err;
3052 do {
e6f81075 3053 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
1da177e4
LT		 3054 switch (err) {
3055 case -NFS4ERR_STALE_STATEID:
3056 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3057 case 0:
3058 return 0;
3059 }
3060 err = nfs4_handle_exception(server, err, &exception);
3061 } while (exception.retry);
3062 return err;
3063}
3064
3065#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3066#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3067
3068/*
3069 * sleep, with exponential backoff, and retry the LOCK operation.
3070 */
3071static unsigned long
3072nfs4_set_lock_task_retry(unsigned long timeout)
3073{
150030b7 3074 schedule_timeout_killable(timeout);
1da177e4
LT		 3075 timeout <<= 1;
3076 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3077 return NFS4_LOCK_MAXTIMEOUT;
3078 return timeout;
3079}
3080
1da177e4
LT		 3081static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3082{
3083 struct inode *inode = state->inode;
3084 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3085 struct nfs_client *clp = server->nfs_client;
911d1aaf 3086 struct nfs_lockt_args arg = {
1da177e4 3087 .fh = NFS_FH(inode),
911d1aaf 3088 .fl = request,
1da177e4 3089 };
911d1aaf
TM		 3090 struct nfs_lockt_res res = {
3091 .denied = request,
1da177e4
LT		 3092 };
3093 struct rpc_message msg = {
3094 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3095 .rpc_argp = &arg,
3096 .rpc_resp = &res,
3097 .rpc_cred = state->owner->so_cred,
3098 };
1da177e4
LT		 3099 struct nfs4_lock_state *lsp;
3100 int status;
3101
3102 down_read(&clp->cl_sem);
911d1aaf 3103 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3104 status = nfs4_set_lock_state(state, request);
3105 if (status != 0)
3106 goto out;
3107 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3108 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3109 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3110 switch (status) {
3111 case 0:
3112 request->fl_type = F_UNLCK;
3113 break;
3114 case -NFS4ERR_DENIED:
3115 status = 0;
1da177e4 3116 }
70cc6487 3117 request->fl_ops->fl_release_private(request);
8d0a8a9d 3118out:
1da177e4
LT		 3119 up_read(&clp->cl_sem);
3120 return status;
3121}
3122
3123static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3124{
3125 struct nfs4_exception exception = { };
3126 int err;
3127
3128 do {
3129 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3130 _nfs4_proc_getlk(state, cmd, request),
3131 &exception);
3132 } while (exception.retry);
3133 return err;
3134}
3135
3136static int do_vfs_lock(struct file *file, struct file_lock *fl)
3137{
3138 int res = 0;
3139 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3140 case FL_POSIX:
3141 res = posix_lock_file_wait(file, fl);
3142 break;
3143 case FL_FLOCK:
3144 res = flock_lock_file_wait(file, fl);
3145 break;
3146 default:
3147 BUG();
3148 }
1da177e4
LT		 3149 return res;
3150}
3151
faf5f49c 3152struct nfs4_unlockdata {
911d1aaf
TM		 3153 struct nfs_locku_args arg;
3154 struct nfs_locku_res res;
faf5f49c
TM		 3155 struct nfs4_lock_state *lsp;
3156 struct nfs_open_context *ctx;
911d1aaf
TM		 3157 struct file_lock fl;
3158 const struct nfs_server *server;
26e976a8 3159 unsigned long timestamp;
faf5f49c
TM		 3160};
3161
911d1aaf
TM		 3162static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3163 struct nfs_open_context *ctx,
3164 struct nfs4_lock_state *lsp,
3165 struct nfs_seqid *seqid)
3166{
3167 struct nfs4_unlockdata *p;
3168 struct inode *inode = lsp->ls_state->inode;
3169
3170 p = kmalloc(sizeof(*p), GFP_KERNEL);
3171 if (p == NULL)
3172 return NULL;
3173 p->arg.fh = NFS_FH(inode);
3174 p->arg.fl = &p->fl;
3175 p->arg.seqid = seqid;
c1d51931 3176 p->res.seqid = seqid;
911d1aaf
TM		 3177 p->arg.stateid = &lsp->ls_stateid;
3178 p->lsp = lsp;
3179 atomic_inc(&lsp->ls_count);
3180 /* Ensure we don't close file until we're done freeing locks! */
3181 p->ctx = get_nfs_open_context(ctx);
3182 memcpy(&p->fl, fl, sizeof(p->fl));
3183 p->server = NFS_SERVER(inode);
3184 return p;
3185}
3186
06f814a3 3187static void nfs4_locku_release_calldata(void *data)
faf5f49c 3188{
963d8fe5 3189 struct nfs4_unlockdata *calldata = data;
911d1aaf 3190 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3191 nfs4_put_lock_state(calldata->lsp);
3192 put_nfs_open_context(calldata->ctx);
3193 kfree(calldata);
faf5f49c
TM		 3194}
3195
963d8fe5 3196static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3197{
963d8fe5 3198 struct nfs4_unlockdata *calldata = data;
faf5f49c 3199
06f814a3
TM		 3200 if (RPC_ASSASSINATED(task))
3201 return;
faf5f49c
TM		 3202 switch (task->tk_status) {
3203 case 0:
3204 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3205 calldata->res.stateid.data,
faf5f49c 3206 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3207 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3208 break;
3209 case -NFS4ERR_STALE_STATEID:
3210 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3211 break;
3212 default:
a6a352e9 3213 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3214 rpc_restart_call(task);
faf5f49c 3215 }
faf5f49c
TM		 3216}
3217
4ce70ada 3218static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3219{
4ce70ada 3220 struct nfs4_unlockdata *calldata = data;
faf5f49c 3221
911d1aaf 3222 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3223 return;
3224 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3225 /* Note: exit _without_ running nfs4_locku_done */
3226 task->tk_action = NULL;
faf5f49c
TM		 3227 return;
3228 }
26e976a8 3229 calldata->timestamp = jiffies;
5138fde0 3230 rpc_call_start(task);
faf5f49c
TM		 3231}
3232
963d8fe5 3233static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3234 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3235 .rpc_call_done = nfs4_locku_done,
06f814a3 3236 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3237};
3238
a5d16a4d
TM		 3239static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3240 struct nfs_open_context *ctx,
3241 struct nfs4_lock_state *lsp,
3242 struct nfs_seqid *seqid)
3243{
3244 struct nfs4_unlockdata *data;
5138fde0
TM		 3245 struct rpc_message msg = {
3246 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3247 .rpc_cred = ctx->cred,
3248 };
c970aa85
TM		 3249 struct rpc_task_setup task_setup_data = {
3250 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5138fde0 3251 .rpc_message = &msg,
c970aa85 3252 .callback_ops = &nfs4_locku_ops,
101070ca 3253 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3254 .flags = RPC_TASK_ASYNC,
3255 };
a5d16a4d 3256
137d6aca
FF		 3257 /* Ensure this is an unlock - when canceling a lock, the
3258 * canceled lock is passed in, and it won't be an unlock.
3259 */
3260 fl->fl_type = F_UNLCK;
3261
a5d16a4d
TM		 3262 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3263 if (data == NULL) {
3264 nfs_free_seqid(seqid);
3265 return ERR_PTR(-ENOMEM);
3266 }
3267
5138fde0
TM		 3268 msg.rpc_argp = &data->arg,
3269 msg.rpc_resp = &data->res,
c970aa85
TM		 3270 task_setup_data.callback_data = data;
3271 return rpc_run_task(&task_setup_data);
a5d16a4d
TM		 3272}
3273
faf5f49c
TM		 3274static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3275{
19e03c57
TM		 3276 struct nfs_client *clp = state->owner->so_client;
3277 struct nfs_inode *nfsi = NFS_I(state->inode);
911d1aaf 3278 struct nfs_seqid *seqid;
1da177e4 3279 struct nfs4_lock_state *lsp;
06f814a3
TM		 3280 struct rpc_task *task;
3281 int status = 0;
536ff0f8 3282 unsigned char fl_flags = request->fl_flags;
faf5f49c 3283
8d0a8a9d 3284 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3285 /* Unlock _before_ we do the RPC call */
3286 request->fl_flags |= FL_EXISTS;
19e03c57
TM		 3287 down_read(&clp->cl_sem);
3288 down_read(&nfsi->rwsem);
3289 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3290 up_read(&nfsi->rwsem);
3291 up_read(&clp->cl_sem);
9b073574 3292 goto out;
19e03c57
TM		 3293 }
3294 up_read(&nfsi->rwsem);
3295 up_read(&clp->cl_sem);
8d0a8a9d 3296 if (status != 0)
9b073574
TM		 3297 goto out;
3298 /* Is this a delegated lock? */
3299 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3300 goto out;
8d0a8a9d 3301 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3302 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3303 status = -ENOMEM;
911d1aaf 3304 if (seqid == NULL)
9b073574 3305 goto out;
cd3758e3 3306 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3307 status = PTR_ERR(task);
3308 if (IS_ERR(task))
9b073574 3309 goto out;
a5d16a4d 3310 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3311 rpc_put_task(task);
9b073574 3312out:
536ff0f8 3313 request->fl_flags = fl_flags;
1da177e4
LT		 3314 return status;
3315}
3316
a5d16a4d
TM		 3317struct nfs4_lockdata {
3318 struct nfs_lock_args arg;
3319 struct nfs_lock_res res;
3320 struct nfs4_lock_state *lsp;
3321 struct nfs_open_context *ctx;
3322 struct file_lock fl;
26e976a8 3323 unsigned long timestamp;
a5d16a4d
TM		 3324 int rpc_status;
3325 int cancelled;
3326};
3327
3328static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3329 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3330{
a5d16a4d
TM		 3331 struct nfs4_lockdata *p;
3332 struct inode *inode = lsp->ls_state->inode;
1da177e4 3333 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3334
3335 p = kzalloc(sizeof(*p), GFP_KERNEL);
3336 if (p == NULL)
3337 return NULL;
3338
3339 p->arg.fh = NFS_FH(inode);
3340 p->arg.fl = &p->fl;
2f74c0a0
TM		 3341 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3342 if (p->arg.open_seqid == NULL)
3343 goto out_free;
a5d16a4d
TM		 3344 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3345 if (p->arg.lock_seqid == NULL)
2f74c0a0 3346 goto out_free_seqid;
a5d16a4d 3347 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3348 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3349 p->arg.lock_owner.id = lsp->ls_id.id;
c1d51931 3350 p->res.lock_seqid = p->arg.lock_seqid;
a5d16a4d
TM		 3351 p->lsp = lsp;
3352 atomic_inc(&lsp->ls_count);
3353 p->ctx = get_nfs_open_context(ctx);
3354 memcpy(&p->fl, fl, sizeof(p->fl));
3355 return p;
2f74c0a0
TM		 3356out_free_seqid:
3357 nfs_free_seqid(p->arg.open_seqid);
a5d16a4d
TM		 3358out_free:
3359 kfree(p);
3360 return NULL;
3361}
3362
3363static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3364{
3365 struct nfs4_lockdata *data = calldata;
3366 struct nfs4_state *state = data->lsp->ls_state;
06735b34 3367
3110ff80 3368 dprintk("%s: begin!\n", __func__);
2f74c0a0
TM		 3369 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3370 return;
a5d16a4d
TM		 3371 /* Do we need to do an open_to_lock_owner? */
3372 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
e6e21970
TM		 3373 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3374 return;
a5d16a4d
TM		 3375 data->arg.open_stateid = &state->stateid;
3376 data->arg.new_lock_owner = 1;
c1d51931 3377 data->res.open_seqid = data->arg.open_seqid;
2f74c0a0
TM		 3378 } else
3379 data->arg.new_lock_owner = 0;
26e976a8 3380 data->timestamp = jiffies;
5138fde0 3381 rpc_call_start(task);
3110ff80 3382 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
a5d16a4d
TM		 3383}
3384
3385static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3386{
3387 struct nfs4_lockdata *data = calldata;
3388
3110ff80 3389 dprintk("%s: begin!\n", __func__);
a5d16a4d
TM		 3390
3391 data->rpc_status = task->tk_status;
3392 if (RPC_ASSASSINATED(task))
3393 goto out;
3394 if (data->arg.new_lock_owner != 0) {
a5d16a4d
TM		 3395 if (data->rpc_status == 0)
3396 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3397 else
3398 goto out;
3399 }
3400 if (data->rpc_status == 0) {
3401 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3402 sizeof(data->lsp->ls_stateid.data));
3403 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3404 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d 3405 }
a5d16a4d 3406out:
3110ff80 3407 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
a5d16a4d
TM		 3408}
3409
3410static void nfs4_lock_release(void *calldata)
3411{
3412 struct nfs4_lockdata *data = calldata;
3413
3110ff80 3414 dprintk("%s: begin!\n", __func__);
2f74c0a0 3415 nfs_free_seqid(data->arg.open_seqid);
a5d16a4d
TM		 3416 if (data->cancelled != 0) {
3417 struct rpc_task *task;
3418 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3419 data->arg.lock_seqid);
3420 if (!IS_ERR(task))
e6b3c4db 3421 rpc_put_task(task);
3110ff80 3422 dprintk("%s: cancelling lock!\n", __func__);
a5d16a4d
TM		 3423 } else
3424 nfs_free_seqid(data->arg.lock_seqid);
3425 nfs4_put_lock_state(data->lsp);
3426 put_nfs_open_context(data->ctx);
3427 kfree(data);
3110ff80 3428 dprintk("%s: done!\n", __func__);
a5d16a4d
TM		 3429}
3430
3431static const struct rpc_call_ops nfs4_lock_ops = {
3432 .rpc_call_prepare = nfs4_lock_prepare,
3433 .rpc_call_done = nfs4_lock_done,
3434 .rpc_release = nfs4_lock_release,
3435};
3436
3437static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3438{
3439 struct nfs4_lockdata *data;
3440 struct rpc_task *task;
5138fde0
TM		 3441 struct rpc_message msg = {
3442 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3443 .rpc_cred = state->owner->so_cred,
3444 };
c970aa85
TM		 3445 struct rpc_task_setup task_setup_data = {
3446 .rpc_client = NFS_CLIENT(state->inode),
5138fde0 3447 .rpc_message = &msg,
c970aa85 3448 .callback_ops = &nfs4_lock_ops,
101070ca 3449 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3450 .flags = RPC_TASK_ASYNC,
3451 };
a5d16a4d
TM		 3452 int ret;
3453
3110ff80 3454 dprintk("%s: begin!\n", __func__);
cd3758e3 3455 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3456 fl->fl_u.nfs4_fl.owner);
3457 if (data == NULL)
3458 return -ENOMEM;
3459 if (IS_SETLKW(cmd))
3460 data->arg.block = 1;
3461 if (reclaim != 0)
3462 data->arg.reclaim = 1;
5138fde0
TM		 3463 msg.rpc_argp = &data->arg,
3464 msg.rpc_resp = &data->res,
c970aa85
TM		 3465 task_setup_data.callback_data = data;
3466 task = rpc_run_task(&task_setup_data);
7a1218a2 3467 if (IS_ERR(task))
a5d16a4d 3468 return PTR_ERR(task);
a5d16a4d
TM		 3469 ret = nfs4_wait_for_completion_rpc_task(task);
3470 if (ret == 0) {
3471 ret = data->rpc_status;
3472 if (ret == -NFS4ERR_DENIED)
3473 ret = -EAGAIN;
3474 } else
3475 data->cancelled = 1;
e6b3c4db 3476 rpc_put_task(task);
3110ff80 3477 dprintk("%s: done, ret = %d!\n", __func__, ret);
a5d16a4d 3478 return ret;
1da177e4
LT		 3479}
3480
3481static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3482{
202b50dc
TM		 3483 struct nfs_server *server = NFS_SERVER(state->inode);
3484 struct nfs4_exception exception = { };
3485 int err;
3486
3487 do {
42a2d13e
TM		 3488 /* Cache the lock if possible... */
3489 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3490 return 0;
202b50dc
TM		 3491 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3492 if (err != -NFS4ERR_DELAY)
3493 break;
3494 nfs4_handle_exception(server, err, &exception);
3495 } while (exception.retry);
3496 return err;
1da177e4
LT		 3497}
3498
3499static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3500{
202b50dc
TM		 3501 struct nfs_server *server = NFS_SERVER(state->inode);
3502 struct nfs4_exception exception = { };
3503 int err;
3504
6bfc93ef
TM		 3505 err = nfs4_set_lock_state(state, request);
3506 if (err != 0)
3507 return err;
202b50dc 3508 do {
42a2d13e
TM		 3509 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3510 return 0;
202b50dc
TM		 3511 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3512 if (err != -NFS4ERR_DELAY)
3513 break;
3514 nfs4_handle_exception(server, err, &exception);
3515 } while (exception.retry);
3516 return err;
1da177e4
LT		 3517}
3518
3519static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3520{
adfa6f98 3521 struct nfs_client *clp = state->owner->so_client;
19e03c57 3522 struct nfs_inode *nfsi = NFS_I(state->inode);
01c3b861 3523 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3524 int status;
3525
6bfc93ef 3526 /* Is this a delegated open? */
6bfc93ef
TM		 3527 status = nfs4_set_lock_state(state, request);
3528 if (status != 0)
3529 goto out;
01c3b861
TM		 3530 request->fl_flags |= FL_ACCESS;
3531 status = do_vfs_lock(request->fl_file, request);
3532 if (status < 0)
3533 goto out;
3534 down_read(&clp->cl_sem);
19e03c57 3535 down_read(&nfsi->rwsem);
01c3b861 3536 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
01c3b861 3537 /* Yes: cache locks! */
01c3b861 3538 /* ...but avoid races with delegation recall... */
19e03c57
TM		 3539 request->fl_flags = fl_flags & ~FL_SLEEP;
3540 status = do_vfs_lock(request->fl_file, request);
3541 goto out_unlock;
01c3b861 3542 }
6bfc93ef
TM		 3543 status = _nfs4_do_setlk(state, cmd, request, 0);
3544 if (status != 0)
01c3b861 3545 goto out_unlock;
6bfc93ef 3546 /* Note: we always want to sleep here! */
01c3b861 3547 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef 3548 if (do_vfs_lock(request->fl_file, request) < 0)
3110ff80 3549 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
01c3b861 3550out_unlock:
19e03c57 3551 up_read(&nfsi->rwsem);
1da177e4 3552 up_read(&clp->cl_sem);
01c3b861
TM		 3553out:
3554 request->fl_flags = fl_flags;
1da177e4
LT		 3555 return status;
3556}
3557
3558static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3559{
3560 struct nfs4_exception exception = { };
3561 int err;
3562
3563 do {
3564 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3565 _nfs4_proc_setlk(state, cmd, request),
3566 &exception);
3567 } while (exception.retry);
3568 return err;
3569}
3570
3571static int
3572nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3573{
3574 struct nfs_open_context *ctx;
3575 struct nfs4_state *state;
3576 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3577 int status;
3578
3579 /* verify open state */
cd3758e3 3580 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3581 state = ctx->state;
3582
3583 if (request->fl_start < 0 || request->fl_end < 0)
3584 return -EINVAL;
3585
3586 if (IS_GETLK(cmd))
3587 return nfs4_proc_getlk(state, F_GETLK, request);
3588
3589 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3590 return -EINVAL;
3591
3592 if (request->fl_type == F_UNLCK)
3593 return nfs4_proc_unlck(state, cmd, request);
3594
3595 do {
3596 status = nfs4_proc_setlk(state, cmd, request);
3597 if ((status != -EAGAIN) || IS_SETLK(cmd))
3598 break;
3599 timeout = nfs4_set_lock_task_retry(timeout);
3600 status = -ERESTARTSYS;
3601 if (signalled())
3602 break;
3603 } while(status < 0);
1da177e4
LT		 3604 return status;
3605}
3606
888e694c
TM		 3607int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3608{
3609 struct nfs_server *server = NFS_SERVER(state->inode);
3610 struct nfs4_exception exception = { };
3611 int err;
3612
3613 err = nfs4_set_lock_state(state, fl);
3614 if (err != 0)
3615 goto out;
3616 do {
3617 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3618 if (err != -NFS4ERR_DELAY)
3619 break;
3620 err = nfs4_handle_exception(server, err, &exception);
3621 } while (exception.retry);
3622out:
3623 return err;
3624}
6b3b5496 3625
aa1870af
BF		 3626#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3627
6b3b5496
BF		 3628int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3629 size_t buflen, int flags)
3630{
4b580ee3
BF		 3631 struct inode *inode = dentry->d_inode;
3632
3633 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3634 return -EOPNOTSUPP;
3635
4b580ee3 3636 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3637}
3638
3639/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3640 * and that's what we'll do for e.g. user attributes that haven't been set.
3641 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3642 * attributes in kernel-managed attribute namespaces. */
3643ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3644 size_t buflen)
3645{
aa1870af
BF		 3646 struct inode *inode = dentry->d_inode;
3647
3648 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3649 return -EOPNOTSUPP;
3650
3651 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3652}
3653
3654ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3655{
aa1870af 3656 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3657
096455a2
BF		 3658 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3659 return 0;
6b3b5496
BF		 3660 if (buf && buflen < len)
3661 return -ERANGE;
3662 if (buf)
aa1870af
BF		 3663 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3664 return len;
6b3b5496
BF		 3665}
3666
56659e99 3667int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3668 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3669{
3670 struct nfs_server *server = NFS_SERVER(dir);
3671 u32 bitmask[2] = {
361e624f
MN		 3672 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3673 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3674 };
3675 struct nfs4_fs_locations_arg args = {
3676 .dir_fh = NFS_FH(dir),
c228fd3a 3677 .name = name,
683b57b4
TM		 3678 .page = page,
3679 .bitmask = bitmask,
3680 };
3681 struct rpc_message msg = {
3682 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3683 .rpc_argp = &args,
7aaa0b3b 3684 .rpc_resp = fs_locations,
683b57b4
TM		 3685 };
3686 int status;
3687
3110ff80 3688 dprintk("%s: start\n", __func__);
c228fd3a 3689 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3690 fs_locations->server = server;
830b8e33 3691 fs_locations->nlocations = 0;
683b57b4 3692 status = rpc_call_sync(server->client, &msg, 0);
3110ff80 3693 dprintk("%s: returned status = %d\n", __func__, status);
683b57b4
TM		 3694 return status;
3695}
3696
1da177e4 3697struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
7eff03ae 3698 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
b79a4a1b 3699 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
1da177e4
LT		 3700 .recover_open = nfs4_open_reclaim,
3701 .recover_lock = nfs4_lock_reclaim,
3702};
3703
b79a4a1b 3704struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
7eff03ae 3705 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
b79a4a1b 3706 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
1da177e4
LT		 3707 .recover_open = nfs4_open_expired,
3708 .recover_lock = nfs4_lock_expired,
3709};
3710
92e1d5be 3711static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3712 .permission = nfs_permission,
3713 .getattr = nfs_getattr,
3714 .setattr = nfs_setattr,
3715 .getxattr = nfs4_getxattr,
3716 .setxattr = nfs4_setxattr,
3717 .listxattr = nfs4_listxattr,
3718};
3719
509de811 3720const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3721 .version = 4, /* protocol version */
3722 .dentry_ops = &nfs4_dentry_operations,
3723 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3724 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3725 .getroot = nfs4_proc_get_root,
3726 .getattr = nfs4_proc_getattr,
3727 .setattr = nfs4_proc_setattr,
2b3de441 3728 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3729 .lookup = nfs4_proc_lookup,
3730 .access = nfs4_proc_access,
3731 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3732 .create = nfs4_proc_create,
3733 .remove = nfs4_proc_remove,
3734 .unlink_setup = nfs4_proc_unlink_setup,
3735 .unlink_done = nfs4_proc_unlink_done,
3736 .rename = nfs4_proc_rename,
3737 .link = nfs4_proc_link,
3738 .symlink = nfs4_proc_symlink,
3739 .mkdir = nfs4_proc_mkdir,
3740 .rmdir = nfs4_proc_remove,
3741 .readdir = nfs4_proc_readdir,
3742 .mknod = nfs4_proc_mknod,
3743 .statfs = nfs4_proc_statfs,
3744 .fsinfo = nfs4_proc_fsinfo,
3745 .pathconf = nfs4_proc_pathconf,
e9326dca 3746 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3747 .decode_dirent = nfs4_decode_dirent,
3748 .read_setup = nfs4_proc_read_setup,
ec06c096 3749 .read_done = nfs4_read_done,
1da177e4 3750 .write_setup = nfs4_proc_write_setup,
788e7a89 3751 .write_done = nfs4_write_done,
1da177e4 3752 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3753 .commit_done = nfs4_commit_done,
1da177e4 3754 .lock = nfs4_proc_lock,
e50a1c2e 3755 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3756};
3757
3758/*
3759 * Local variables:
3760 * c-basic-offset: 8
3761 * End:
3762 */
Linux 6.x block layer and io_uring tree(s)