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drivers/net: convert BUG_TRAP to generic WARN_ON
[linux.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 <[email protected]>
10 * Andy Adamson <[email protected]>
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 *);
faf5f49c 66static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
adfa6f98 67static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
9936781d
TM		 68static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
69static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
1da177e4 70
1da177e4
LT		 71/* Prevent leaks of NFSv4 errors into userland */
72int nfs4_map_errors(int err)
73{
74 if (err < -1000) {
75 dprintk("%s could not handle NFSv4 error %d\n",
3110ff80 76 __func__, -err);
1da177e4
LT		 77 return -EIO;
78 }
79 return err;
80}
81
82/*
83 * This is our standard bitmap for GETATTR requests.
84 */
85const u32 nfs4_fattr_bitmap[2] = {
86 FATTR4_WORD0_TYPE
87 | FATTR4_WORD0_CHANGE
88 | FATTR4_WORD0_SIZE
89 | FATTR4_WORD0_FSID
90 | FATTR4_WORD0_FILEID,
91 FATTR4_WORD1_MODE
92 | FATTR4_WORD1_NUMLINKS
93 | FATTR4_WORD1_OWNER
94 | FATTR4_WORD1_OWNER_GROUP
95 | FATTR4_WORD1_RAWDEV
96 | FATTR4_WORD1_SPACE_USED
97 | FATTR4_WORD1_TIME_ACCESS
98 | FATTR4_WORD1_TIME_METADATA
99 | FATTR4_WORD1_TIME_MODIFY
100};
101
102const u32 nfs4_statfs_bitmap[2] = {
103 FATTR4_WORD0_FILES_AVAIL
104 | FATTR4_WORD0_FILES_FREE
105 | FATTR4_WORD0_FILES_TOTAL,
106 FATTR4_WORD1_SPACE_AVAIL
107 | FATTR4_WORD1_SPACE_FREE
108 | FATTR4_WORD1_SPACE_TOTAL
109};
110
4ce79717 111const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 112 FATTR4_WORD0_MAXLINK
113 | FATTR4_WORD0_MAXNAME,
114 0
115};
116
117const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
118 | FATTR4_WORD0_MAXREAD
119 | FATTR4_WORD0_MAXWRITE
120 | FATTR4_WORD0_LEASE_TIME,
121 0
122};
123
830b8e33
MN		 124const u32 nfs4_fs_locations_bitmap[2] = {
125 FATTR4_WORD0_TYPE
126 | FATTR4_WORD0_CHANGE
127 | FATTR4_WORD0_SIZE
128 | FATTR4_WORD0_FSID
129 | FATTR4_WORD0_FILEID
130 | FATTR4_WORD0_FS_LOCATIONS,
131 FATTR4_WORD1_MODE
132 | FATTR4_WORD1_NUMLINKS
133 | FATTR4_WORD1_OWNER
134 | FATTR4_WORD1_OWNER_GROUP
135 | FATTR4_WORD1_RAWDEV
136 | FATTR4_WORD1_SPACE_USED
137 | FATTR4_WORD1_TIME_ACCESS
138 | FATTR4_WORD1_TIME_METADATA
139 | FATTR4_WORD1_TIME_MODIFY
140 | FATTR4_WORD1_MOUNTED_ON_FILEID
141};
142
bc4785cd 143static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 144 struct nfs4_readdir_arg *readdir)
145{
0dbb4c67 146 __be32 *start, *p;
1da177e4
LT		 147
148 BUG_ON(readdir->count < 80);
149 if (cookie > 2) {
b7ef1956 150 readdir->cookie = cookie;
1da177e4
LT		 151 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
152 return;
153 }
154
155 readdir->cookie = 0;
156 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
157 if (cookie == 2)
158 return;
159
160 /*
161 * NFSv4 servers do not return entries for '.' and '..'
162 * Therefore, we fake these entries here. We let '.'
163 * have cookie 0 and '..' have cookie 1. Note that
164 * when talking to the server, we always send cookie 0
165 * instead of 1 or 2.
166 */
0dbb4c67 167 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 168
169 if (cookie == 0) {
170 *p++ = xdr_one; /* next */
171 *p++ = xdr_zero; /* cookie, first word */
172 *p++ = xdr_one; /* cookie, second word */
173 *p++ = xdr_one; /* entry len */
174 memcpy(p, ".\0\0\0", 4); /* entry */
175 p++;
176 *p++ = xdr_one; /* bitmap length */
177 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
178 *p++ = htonl(8); /* attribute buffer length */
4e769b93 179 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
1da177e4
LT		 180 }
181
182 *p++ = xdr_one; /* next */
183 *p++ = xdr_zero; /* cookie, first word */
184 *p++ = xdr_two; /* cookie, second word */
185 *p++ = xdr_two; /* entry len */
186 memcpy(p, "..\0\0", 4); /* entry */
187 p++;
188 *p++ = xdr_one; /* bitmap length */
189 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
190 *p++ = htonl(8); /* attribute buffer length */
4e769b93 191 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
1da177e4
LT		 192
193 readdir->pgbase = (char *)p - (char *)start;
194 readdir->count -= readdir->pgbase;
195 kunmap_atomic(start, KM_USER0);
196}
197
26e976a8 198static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 199{
7539bbab 200 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 201 spin_lock(&clp->cl_lock);
202 if (time_before(clp->cl_last_renewal,timestamp))
203 clp->cl_last_renewal = timestamp;
204 spin_unlock(&clp->cl_lock);
205}
206
38478b24 207static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 208{
38478b24 209 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 210
38478b24 211 spin_lock(&dir->i_lock);
40d24704
TM		 212 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
213 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
bfc69a45 214 nfs_force_lookup_revalidate(dir);
40d24704 215 nfsi->change_attr = cinfo->after;
38478b24 216 spin_unlock(&dir->i_lock);
1da177e4
LT		 217}
218
e56e0b78 219struct nfs4_opendata {
c6d00e63 220 struct kref kref;
e56e0b78
TM		 221 struct nfs_openargs o_arg;
222 struct nfs_openres o_res;
cdd4e68b
TM		 223 struct nfs_open_confirmargs c_arg;
224 struct nfs_open_confirmres c_res;
e56e0b78
TM		 225 struct nfs_fattr f_attr;
226 struct nfs_fattr dir_attr;
ad389da7 227 struct path path;
e56e0b78
TM		 228 struct dentry *dir;
229 struct nfs4_state_owner *owner;
aac00a8d 230 struct nfs4_state *state;
e56e0b78 231 struct iattr attrs;
26e976a8 232 unsigned long timestamp;
3e309914 233 unsigned int rpc_done : 1;
24ac23ab
TM		 234 int rpc_status;
235 int cancelled;
e56e0b78
TM		 236};
237
2ced46c2
TM		 238
239static void nfs4_init_opendata_res(struct nfs4_opendata *p)
240{
241 p->o_res.f_attr = &p->f_attr;
242 p->o_res.dir_attr = &p->dir_attr;
c1d51931
TM		 243 p->o_res.seqid = p->o_arg.seqid;
244 p->c_res.seqid = p->c_arg.seqid;
2ced46c2
TM		 245 p->o_res.server = p->o_arg.server;
246 nfs_fattr_init(&p->f_attr);
247 nfs_fattr_init(&p->dir_attr);
248}
249
ad389da7 250static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
e56e0b78
TM		 251 struct nfs4_state_owner *sp, int flags,
252 const struct iattr *attrs)
253{
ad389da7 254 struct dentry *parent = dget_parent(path->dentry);
e56e0b78
TM		 255 struct inode *dir = parent->d_inode;
256 struct nfs_server *server = NFS_SERVER(dir);
257 struct nfs4_opendata *p;
258
259 p = kzalloc(sizeof(*p), GFP_KERNEL);
260 if (p == NULL)
261 goto err;
262 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
263 if (p->o_arg.seqid == NULL)
264 goto err_free;
ad389da7
TM		 265 p->path.mnt = mntget(path->mnt);
266 p->path.dentry = dget(path->dentry);
e56e0b78
TM		 267 p->dir = parent;
268 p->owner = sp;
269 atomic_inc(&sp->so_count);
270 p->o_arg.fh = NFS_FH(dir);
271 p->o_arg.open_flags = flags,
7539bbab 272 p->o_arg.clientid = server->nfs_client->cl_clientid;
9f958ab8 273 p->o_arg.id = sp->so_owner_id.id;
ad389da7 274 p->o_arg.name = &p->path.dentry->d_name;
e56e0b78
TM		 275 p->o_arg.server = server;
276 p->o_arg.bitmask = server->attr_bitmask;
277 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
e56e0b78
TM		 278 if (flags & O_EXCL) {
279 u32 *s = (u32 *) p->o_arg.u.verifier.data;
280 s[0] = jiffies;
281 s[1] = current->pid;
282 } else if (flags & O_CREAT) {
283 p->o_arg.u.attrs = &p->attrs;
284 memcpy(&p->attrs, attrs, sizeof(p->attrs));
285 }
cdd4e68b
TM		 286 p->c_arg.fh = &p->o_res.fh;
287 p->c_arg.stateid = &p->o_res.stateid;
288 p->c_arg.seqid = p->o_arg.seqid;
2ced46c2 289 nfs4_init_opendata_res(p);
c6d00e63 290 kref_init(&p->kref);
e56e0b78
TM		 291 return p;
292err_free:
293 kfree(p);
294err:
295 dput(parent);
296 return NULL;
297}
298
c6d00e63 299static void nfs4_opendata_free(struct kref *kref)
e56e0b78 300{
c6d00e63
TM		 301 struct nfs4_opendata *p = container_of(kref,
302 struct nfs4_opendata, kref);
303
304 nfs_free_seqid(p->o_arg.seqid);
aac00a8d
TM		 305 if (p->state != NULL)
306 nfs4_put_open_state(p->state);
c6d00e63
TM		 307 nfs4_put_state_owner(p->owner);
308 dput(p->dir);
31f31db1 309 path_put(&p->path);
c6d00e63
TM		 310 kfree(p);
311}
312
313static void nfs4_opendata_put(struct nfs4_opendata *p)
314{
315 if (p != NULL)
316 kref_put(&p->kref, nfs4_opendata_free);
e56e0b78
TM		 317}
318
06f814a3
TM		 319static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
320{
06f814a3
TM		 321 int ret;
322
06f814a3 323 ret = rpc_wait_for_completion_task(task);
06f814a3
TM		 324 return ret;
325}
326
6ee41268
TM		 327static int can_open_cached(struct nfs4_state *state, int mode)
328{
329 int ret = 0;
330 switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
331 case FMODE_READ:
332 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
6ee41268
TM		 333 break;
334 case FMODE_WRITE:
335 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
6ee41268
TM		 336 break;
337 case FMODE_READ|FMODE_WRITE:
338 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
339 }
340 return ret;
341}
342
aac00a8d
TM		 343static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
344{
345 if ((delegation->type & open_flags) != open_flags)
346 return 0;
347 if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
348 return 0;
349 return 1;
350}
351
003707c7 352static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
e7616923
TM		 353{
354 switch (open_flags) {
355 case FMODE_WRITE:
356 state->n_wronly++;
357 break;
358 case FMODE_READ:
359 state->n_rdonly++;
360 break;
361 case FMODE_READ|FMODE_WRITE:
362 state->n_rdwr++;
363 }
003707c7
TM		 364 nfs4_state_set_mode_locked(state, state->state | open_flags);
365}
366
367static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
368{
369 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
370 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
371 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
372 switch (open_flags) {
373 case FMODE_READ:
374 set_bit(NFS_O_RDONLY_STATE, &state->flags);
375 break;
376 case FMODE_WRITE:
377 set_bit(NFS_O_WRONLY_STATE, &state->flags);
378 break;
379 case FMODE_READ|FMODE_WRITE:
380 set_bit(NFS_O_RDWR_STATE, &state->flags);
381 }
e7616923
TM		 382}
383
003707c7
TM		 384static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
385{
8bda4e4c 386 write_seqlock(&state->seqlock);
003707c7 387 nfs_set_open_stateid_locked(state, stateid, open_flags);
8bda4e4c 388 write_sequnlock(&state->seqlock);
003707c7
TM		 389}
390
391static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
1da177e4 392{
1da177e4 393 open_flags &= (FMODE_READ|FMODE_WRITE);
8bda4e4c
TM		 394 /*
395 * Protect the call to nfs4_state_set_mode_locked and
396 * serialise the stateid update
397 */
398 write_seqlock(&state->seqlock);
003707c7
TM		 399 if (deleg_stateid != NULL) {
400 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
401 set_bit(NFS_DELEGATED_STATE, &state->flags);
402 }
403 if (open_stateid != NULL)
404 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
8bda4e4c
TM		 405 write_sequnlock(&state->seqlock);
406 spin_lock(&state->owner->so_lock);
e7616923 407 update_open_stateflags(state, open_flags);
ec073428 408 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 409}
410
aac00a8d
TM		 411static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
412{
413 struct nfs_delegation *delegation;
414
415 rcu_read_lock();
416 delegation = rcu_dereference(NFS_I(inode)->delegation);
417 if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
418 rcu_read_unlock();
419 return;
420 }
421 rcu_read_unlock();
422 nfs_inode_return_delegation(inode);
423}
424
6ee41268 425static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
aac00a8d
TM		 426{
427 struct nfs4_state *state = opendata->state;
428 struct nfs_inode *nfsi = NFS_I(state->inode);
429 struct nfs_delegation *delegation;
430 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
431 nfs4_stateid stateid;
432 int ret = -EAGAIN;
433
434 rcu_read_lock();
435 delegation = rcu_dereference(nfsi->delegation);
aac00a8d 436 for (;;) {
6ee41268
TM		 437 if (can_open_cached(state, open_mode)) {
438 spin_lock(&state->owner->so_lock);
439 if (can_open_cached(state, open_mode)) {
440 update_open_stateflags(state, open_mode);
441 spin_unlock(&state->owner->so_lock);
442 rcu_read_unlock();
443 goto out_return_state;
444 }
445 spin_unlock(&state->owner->so_lock);
446 }
447 if (delegation == NULL)
448 break;
aac00a8d
TM		 449 if (!can_open_delegated(delegation, open_mode))
450 break;
451 /* Save the delegation */
452 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
453 rcu_read_unlock();
af22f94a 454 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
aac00a8d
TM		 455 if (ret != 0)
456 goto out;
457 ret = -EAGAIN;
458 rcu_read_lock();
459 delegation = rcu_dereference(nfsi->delegation);
6ee41268 460 /* If no delegation, try a cached open */
aac00a8d 461 if (delegation == NULL)
6ee41268 462 continue;
aac00a8d
TM		 463 /* Is the delegation still valid? */
464 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
465 continue;
466 rcu_read_unlock();
467 update_open_stateid(state, NULL, &stateid, open_mode);
468 goto out_return_state;
469 }
aac00a8d
TM		 470 rcu_read_unlock();
471out:
472 return ERR_PTR(ret);
473out_return_state:
474 atomic_inc(&state->count);
475 return state;
476}
477
24ac23ab
TM		 478static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
479{
480 struct inode *inode;
481 struct nfs4_state *state = NULL;
003707c7
TM		 482 struct nfs_delegation *delegation;
483 nfs4_stateid *deleg_stateid = NULL;
1b370bc2 484 int ret;
24ac23ab 485
aac00a8d 486 if (!data->rpc_done) {
6ee41268 487 state = nfs4_try_open_cached(data);
aac00a8d
TM		 488 goto out;
489 }
490
1b370bc2 491 ret = -EAGAIN;
24ac23ab 492 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1b370bc2 493 goto err;
24ac23ab 494 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1b370bc2 495 ret = PTR_ERR(inode);
03f28e3a 496 if (IS_ERR(inode))
1b370bc2
TM		 497 goto err;
498 ret = -ENOMEM;
24ac23ab
TM		 499 state = nfs4_get_open_state(inode, data->owner);
500 if (state == NULL)
1b370bc2 501 goto err_put_inode;
549d6ed5 502 if (data->o_res.delegation_type != 0) {
549d6ed5
TM		 503 int delegation_flags = 0;
504
003707c7
TM		 505 rcu_read_lock();
506 delegation = rcu_dereference(NFS_I(inode)->delegation);
507 if (delegation)
508 delegation_flags = delegation->flags;
509 rcu_read_unlock();
549d6ed5
TM		 510 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
511 nfs_inode_set_delegation(state->inode,
512 data->owner->so_cred,
513 &data->o_res);
514 else
515 nfs_inode_reclaim_delegation(state->inode,
516 data->owner->so_cred,
517 &data->o_res);
518 }
003707c7
TM		 519 rcu_read_lock();
520 delegation = rcu_dereference(NFS_I(inode)->delegation);
521 if (delegation != NULL)
522 deleg_stateid = &delegation->stateid;
523 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
524 rcu_read_unlock();
24ac23ab 525 iput(inode);
aac00a8d 526out:
24ac23ab 527 return state;
1b370bc2
TM		 528err_put_inode:
529 iput(inode);
530err:
531 return ERR_PTR(ret);
24ac23ab
TM		 532}
533
864472e9
TM		 534static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
535{
536 struct nfs_inode *nfsi = NFS_I(state->inode);
537 struct nfs_open_context *ctx;
538
539 spin_lock(&state->inode->i_lock);
540 list_for_each_entry(ctx, &nfsi->open_files, list) {
541 if (ctx->state != state)
542 continue;
543 get_nfs_open_context(ctx);
544 spin_unlock(&state->inode->i_lock);
545 return ctx;
546 }
547 spin_unlock(&state->inode->i_lock);
548 return ERR_PTR(-ENOENT);
549}
550
6f220ed5
TM		 551static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
552{
553 struct nfs4_opendata *opendata;
554
555 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
556 if (opendata == NULL)
557 return ERR_PTR(-ENOMEM);
558 opendata->state = state;
559 atomic_inc(&state->count);
560 return opendata;
561}
562
2ced46c2 563static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
864472e9 564{
2ced46c2 565 struct nfs4_state *newstate;
864472e9
TM		 566 int ret;
567
568 opendata->o_arg.open_flags = openflags;
2ced46c2
TM		 569 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
570 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
571 nfs4_init_opendata_res(opendata);
864472e9
TM		 572 ret = _nfs4_proc_open(opendata);
573 if (ret != 0)
574 return ret;
2ced46c2 575 newstate = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 576 if (IS_ERR(newstate))
577 return PTR_ERR(newstate);
578 nfs4_close_state(&opendata->path, newstate, openflags);
2ced46c2 579 *res = newstate;
864472e9
TM		 580 return 0;
581}
582
583static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
584{
864472e9 585 struct nfs4_state *newstate;
864472e9
TM		 586 int ret;
587
588 /* memory barrier prior to reading state->n_* */
2ced46c2 589 clear_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9
TM		 590 smp_rmb();
591 if (state->n_rdwr != 0) {
2ced46c2 592 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
864472e9
TM		 593 if (ret != 0)
594 return ret;
2ced46c2
TM		 595 if (newstate != state)
596 return -ESTALE;
864472e9
TM		 597 }
598 if (state->n_wronly != 0) {
2ced46c2 599 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
864472e9
TM		 600 if (ret != 0)
601 return ret;
2ced46c2
TM		 602 if (newstate != state)
603 return -ESTALE;
864472e9
TM		 604 }
605 if (state->n_rdonly != 0) {
2ced46c2 606 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
864472e9
TM		 607 if (ret != 0)
608 return ret;
2ced46c2
TM		 609 if (newstate != state)
610 return -ESTALE;
864472e9 611 }
1ac7e2fd
TM		 612 /*
613 * We may have performed cached opens for all three recoveries.
614 * Check if we need to update the current stateid.
615 */
616 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
617 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
8bda4e4c 618 write_seqlock(&state->seqlock);
1ac7e2fd
TM		 619 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
620 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
8bda4e4c 621 write_sequnlock(&state->seqlock);
1ac7e2fd 622 }
864472e9
TM		 623 return 0;
624}
625
1da177e4
LT		 626/*
627 * OPEN_RECLAIM:
628 * reclaim state on the server after a reboot.
1da177e4 629 */
539cd03a 630static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 631{
1ac7e2fd 632 struct nfs_delegation *delegation;
864472e9
TM		 633 struct nfs4_opendata *opendata;
634 int delegation_type = 0;
1da177e4
LT		 635 int status;
636
6f220ed5
TM		 637 opendata = nfs4_open_recoverdata_alloc(ctx, state);
638 if (IS_ERR(opendata))
639 return PTR_ERR(opendata);
864472e9
TM		 640 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
641 opendata->o_arg.fh = NFS_FH(state->inode);
1ac7e2fd
TM		 642 rcu_read_lock();
643 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
644 if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
65bbf6bd 645 delegation_type = delegation->type;
1ac7e2fd 646 rcu_read_unlock();
864472e9
TM		 647 opendata->o_arg.u.delegation_type = delegation_type;
648 status = nfs4_open_recover(opendata, state);
c6d00e63 649 nfs4_opendata_put(opendata);
1da177e4
LT		 650 return status;
651}
652
539cd03a 653static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 654{
655 struct nfs_server *server = NFS_SERVER(state->inode);
656 struct nfs4_exception exception = { };
657 int err;
658 do {
539cd03a 659 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 660 if (err != -NFS4ERR_DELAY)
661 break;
662 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 663 } while (exception.retry);
664 return err;
665}
666
864472e9
TM		 667static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
668{
669 struct nfs_open_context *ctx;
670 int ret;
671
672 ctx = nfs4_state_find_open_context(state);
673 if (IS_ERR(ctx))
674 return PTR_ERR(ctx);
539cd03a 675 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 676 put_nfs_open_context(ctx);
677 return ret;
678}
679
13437e12 680static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4 681{
e56e0b78 682 struct nfs4_opendata *opendata;
864472e9 683 int ret;
1da177e4 684
6f220ed5
TM		 685 opendata = nfs4_open_recoverdata_alloc(ctx, state);
686 if (IS_ERR(opendata))
687 return PTR_ERR(opendata);
e56e0b78 688 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
13437e12 689 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
e56e0b78 690 sizeof(opendata->o_arg.u.delegation.data));
864472e9 691 ret = nfs4_open_recover(opendata, state);
c6d00e63 692 nfs4_opendata_put(opendata);
864472e9 693 return ret;
1da177e4
LT		 694}
695
13437e12 696int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 697{
698 struct nfs4_exception exception = { };
539cd03a 699 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 700 int err;
701 do {
13437e12 702 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1da177e4
LT		 703 switch (err) {
704 case 0:
705 return err;
706 case -NFS4ERR_STALE_CLIENTID:
707 case -NFS4ERR_STALE_STATEID:
708 case -NFS4ERR_EXPIRED:
709 /* Don't recall a delegation if it was lost */
7539bbab 710 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 711 return err;
712 }
713 err = nfs4_handle_exception(server, err, &exception);
714 } while (exception.retry);
715 return err;
716}
717
cdd4e68b
TM		 718static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
719{
720 struct nfs4_opendata *data = calldata;
721
722 data->rpc_status = task->tk_status;
723 if (RPC_ASSASSINATED(task))
724 return;
26e976a8 725 if (data->rpc_status == 0) {
cdd4e68b
TM		 726 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
727 sizeof(data->o_res.stateid.data));
bb22629e 728 nfs_confirm_seqid(&data->owner->so_seqid, 0);
26e976a8 729 renew_lease(data->o_res.server, data->timestamp);
3e309914 730 data->rpc_done = 1;
26e976a8 731 }
cdd4e68b
TM		 732}
733
734static void nfs4_open_confirm_release(void *calldata)
735{
736 struct nfs4_opendata *data = calldata;
737 struct nfs4_state *state = NULL;
738
739 /* If this request hasn't been cancelled, do nothing */
740 if (data->cancelled == 0)
741 goto out_free;
742 /* In case of error, no cleanup! */
3e309914 743 if (!data->rpc_done)
cdd4e68b 744 goto out_free;
cdd4e68b 745 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 746 if (!IS_ERR(state))
4a35bd41 747 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 748out_free:
c6d00e63 749 nfs4_opendata_put(data);
cdd4e68b
TM		 750}
751
752static const struct rpc_call_ops nfs4_open_confirm_ops = {
cdd4e68b
TM		 753 .rpc_call_done = nfs4_open_confirm_done,
754 .rpc_release = nfs4_open_confirm_release,
755};
756
757/*
758 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
759 */
760static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
761{
762 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
763 struct rpc_task *task;
5138fde0
TM		 764 struct rpc_message msg = {
765 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
766 .rpc_argp = &data->c_arg,
767 .rpc_resp = &data->c_res,
768 .rpc_cred = data->owner->so_cred,
769 };
c970aa85
TM		 770 struct rpc_task_setup task_setup_data = {
771 .rpc_client = server->client,
5138fde0 772 .rpc_message = &msg,
c970aa85
TM		 773 .callback_ops = &nfs4_open_confirm_ops,
774 .callback_data = data,
101070ca 775 .workqueue = nfsiod_workqueue,
c970aa85
TM		 776 .flags = RPC_TASK_ASYNC,
777 };
1da177e4
LT		 778 int status;
779
c6d00e63 780 kref_get(&data->kref);
3e309914
TM		 781 data->rpc_done = 0;
782 data->rpc_status = 0;
5138fde0 783 data->timestamp = jiffies;
c970aa85 784 task = rpc_run_task(&task_setup_data);
7a1218a2 785 if (IS_ERR(task))
cdd4e68b 786 return PTR_ERR(task);
cdd4e68b
TM		 787 status = nfs4_wait_for_completion_rpc_task(task);
788 if (status != 0) {
789 data->cancelled = 1;
790 smp_wmb();
791 } else
792 status = data->rpc_status;
e6b3c4db 793 rpc_put_task(task);
1da177e4
LT		 794 return status;
795}
796
24ac23ab 797static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 798{
24ac23ab
TM		 799 struct nfs4_opendata *data = calldata;
800 struct nfs4_state_owner *sp = data->owner;
5138fde0 801
24ac23ab
TM		 802 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
803 return;
aac00a8d
TM		 804 /*
805 * Check if we still need to send an OPEN call, or if we can use
806 * a delegation instead.
807 */
808 if (data->state != NULL) {
809 struct nfs_delegation *delegation;
810
6ee41268
TM		 811 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
812 goto out_no_action;
aac00a8d
TM		 813 rcu_read_lock();
814 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
815 if (delegation != NULL &&
816 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
817 rcu_read_unlock();
6ee41268 818 goto out_no_action;
aac00a8d
TM		 819 }
820 rcu_read_unlock();
821 }
24ac23ab 822 /* Update sequence id. */
9f958ab8 823 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 824 data->o_arg.clientid = sp->so_client->cl_clientid;
6f220ed5 825 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
5138fde0 826 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
6f220ed5
TM		 827 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
828 }
26e976a8 829 data->timestamp = jiffies;
5138fde0 830 rpc_call_start(task);
6ee41268
TM		 831 return;
832out_no_action:
833 task->tk_action = NULL;
834
24ac23ab 835}
1da177e4 836
24ac23ab
TM		 837static void nfs4_open_done(struct rpc_task *task, void *calldata)
838{
839 struct nfs4_opendata *data = calldata;
1da177e4 840
24ac23ab
TM		 841 data->rpc_status = task->tk_status;
842 if (RPC_ASSASSINATED(task))
843 return;
844 if (task->tk_status == 0) {
845 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 846 case S_IFREG:
847 break;
848 case S_IFLNK:
24ac23ab 849 data->rpc_status = -ELOOP;
6f926b5b
TM		 850 break;
851 case S_IFDIR:
24ac23ab 852 data->rpc_status = -EISDIR;
6f926b5b
TM		 853 break;
854 default:
24ac23ab 855 data->rpc_status = -ENOTDIR;
6f926b5b 856 }
26e976a8 857 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 858 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
859 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 860 }
3e309914 861 data->rpc_done = 1;
24ac23ab 862}
6f926b5b 863
24ac23ab
TM		 864static void nfs4_open_release(void *calldata)
865{
866 struct nfs4_opendata *data = calldata;
867 struct nfs4_state *state = NULL;
868
869 /* If this request hasn't been cancelled, do nothing */
870 if (data->cancelled == 0)
871 goto out_free;
872 /* In case of error, no cleanup! */
3e309914 873 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 874 goto out_free;
875 /* In case we need an open_confirm, no cleanup! */
876 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
877 goto out_free;
24ac23ab 878 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 879 if (!IS_ERR(state))
4a35bd41 880 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 881out_free:
c6d00e63 882 nfs4_opendata_put(data);
24ac23ab
TM		 883}
884
885static const struct rpc_call_ops nfs4_open_ops = {
886 .rpc_call_prepare = nfs4_open_prepare,
887 .rpc_call_done = nfs4_open_done,
888 .rpc_release = nfs4_open_release,
889};
890
891/*
892 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
893 */
894static int _nfs4_proc_open(struct nfs4_opendata *data)
895{
896 struct inode *dir = data->dir->d_inode;
897 struct nfs_server *server = NFS_SERVER(dir);
898 struct nfs_openargs *o_arg = &data->o_arg;
899 struct nfs_openres *o_res = &data->o_res;
900 struct rpc_task *task;
5138fde0
TM		 901 struct rpc_message msg = {
902 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
903 .rpc_argp = o_arg,
904 .rpc_resp = o_res,
905 .rpc_cred = data->owner->so_cred,
906 };
c970aa85
TM		 907 struct rpc_task_setup task_setup_data = {
908 .rpc_client = server->client,
5138fde0 909 .rpc_message = &msg,
c970aa85
TM		 910 .callback_ops = &nfs4_open_ops,
911 .callback_data = data,
101070ca 912 .workqueue = nfsiod_workqueue,
c970aa85
TM		 913 .flags = RPC_TASK_ASYNC,
914 };
24ac23ab
TM		 915 int status;
916
c6d00e63 917 kref_get(&data->kref);
3e309914
TM		 918 data->rpc_done = 0;
919 data->rpc_status = 0;
2ced46c2 920 data->cancelled = 0;
c970aa85 921 task = rpc_run_task(&task_setup_data);
7a1218a2 922 if (IS_ERR(task))
24ac23ab 923 return PTR_ERR(task);
24ac23ab
TM		 924 status = nfs4_wait_for_completion_rpc_task(task);
925 if (status != 0) {
926 data->cancelled = 1;
927 smp_wmb();
928 } else
929 status = data->rpc_status;
e6b3c4db 930 rpc_put_task(task);
3e309914 931 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 932 return status;
933
9936781d
TM		 934 if (o_res->fh.size == 0)
935 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
936
56ae19f3
TM		 937 if (o_arg->open_flags & O_CREAT) {
938 update_changeattr(dir, &o_res->cinfo);
939 nfs_post_op_update_inode(dir, o_res->dir_attr);
940 } else
941 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 942 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 943 status = _nfs4_proc_open_confirm(data);
1da177e4 944 if (status != 0)
24ac23ab 945 return status;
1da177e4
LT		 946 }
947 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
9936781d 948 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 949 return 0;
1da177e4
LT		 950}
951
10afec90 952static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 953{
7539bbab 954 struct nfs_client *clp = server->nfs_client;
6b30954e 955 int ret;
58d9714a 956
6b30954e
TM		 957 for (;;) {
958 ret = nfs4_wait_clnt_recover(server->client, clp);
959 if (ret != 0)
960 return ret;
961 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
962 break;
58d9714a 963 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 964 }
965 return 0;
58d9714a
TM		 966}
967
1da177e4
LT		 968/*
969 * OPEN_EXPIRED:
970 * reclaim state on the server after a network partition.
971 * Assumes caller holds the appropriate lock
972 */
539cd03a 973static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 974{
e56e0b78 975 struct nfs4_opendata *opendata;
864472e9 976 int ret;
1da177e4 977
6f220ed5
TM		 978 opendata = nfs4_open_recoverdata_alloc(ctx, state);
979 if (IS_ERR(opendata))
980 return PTR_ERR(opendata);
864472e9 981 ret = nfs4_open_recover(opendata, state);
35d05778 982 if (ret == -ESTALE)
539cd03a 983 d_drop(ctx->path.dentry);
c6d00e63 984 nfs4_opendata_put(opendata);
864472e9 985 return ret;
1da177e4
LT		 986}
987
539cd03a 988static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 989{
539cd03a 990 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 991 struct nfs4_exception exception = { };
992 int err;
993
994 do {
539cd03a 995 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 996 if (err == -NFS4ERR_DELAY)
997 nfs4_handle_exception(server, err, &exception);
998 } while (exception.retry);
999 return err;
1000}
1001
1da177e4
LT		 1002static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1003{
1da177e4 1004 struct nfs_open_context *ctx;
864472e9 1005 int ret;
1da177e4 1006
864472e9
TM		 1007 ctx = nfs4_state_find_open_context(state);
1008 if (IS_ERR(ctx))
1009 return PTR_ERR(ctx);
539cd03a 1010 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1011 put_nfs_open_context(ctx);
1012 return ret;
1da177e4
LT		 1013}
1014
aa53ed54
JL		 1015/*
1016 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1017 * fields corresponding to attributes that were used to store the verifier.
1018 * Make sure we clobber those fields in the later setattr call
1019 */
1020static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1021{
1022 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1023 !(sattr->ia_valid & ATTR_ATIME_SET))
1024 sattr->ia_valid |= ATTR_ATIME;
1025
1026 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1027 !(sattr->ia_valid & ATTR_MTIME_SET))
1028 sattr->ia_valid |= ATTR_MTIME;
1029}
1030
1da177e4 1031/*
24ac23ab 1032 * Returns a referenced nfs4_state
1da177e4 1033 */
ad389da7 1034static 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		 1035{
1036 struct nfs4_state_owner *sp;
1037 struct nfs4_state *state = NULL;
1038 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 1039 struct nfs_client *clp = server->nfs_client;
e56e0b78 1040 struct nfs4_opendata *opendata;
aac00a8d 1041 int status;
1da177e4
LT		 1042
1043 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1044 status = -ENOMEM;
1045 if (!(sp = nfs4_get_state_owner(server, cred))) {
1046 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1047 goto out_err;
1048 }
58d9714a
TM		 1049 status = nfs4_recover_expired_lease(server);
1050 if (status != 0)
b4454fe1 1051 goto err_put_state_owner;
aac00a8d
TM		 1052 if (path->dentry->d_inode != NULL)
1053 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a
TM		 1054 down_read(&clp->cl_sem);
1055 status = -ENOMEM;
ad389da7 1056 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1057 if (opendata == NULL)
76723de0 1058 goto err_release_rwsem;
1da177e4 1059
aac00a8d
TM		 1060 if (path->dentry->d_inode != NULL)
1061 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1062
24ac23ab 1063 status = _nfs4_proc_open(opendata);
1da177e4 1064 if (status != 0)
c6d00e63 1065 goto err_opendata_put;
1da177e4 1066
aa53ed54
JL		 1067 if (opendata->o_arg.open_flags & O_EXCL)
1068 nfs4_exclusive_attrset(opendata, sattr);
1069
24ac23ab 1070 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1071 status = PTR_ERR(state);
1072 if (IS_ERR(state))
c6d00e63 1073 goto err_opendata_put;
c6d00e63 1074 nfs4_opendata_put(opendata);
1da177e4
LT		 1075 nfs4_put_state_owner(sp);
1076 up_read(&clp->cl_sem);
1077 *res = state;
1078 return 0;
c6d00e63
TM		 1079err_opendata_put:
1080 nfs4_opendata_put(opendata);
76723de0
TM		 1081err_release_rwsem:
1082 up_read(&clp->cl_sem);
e56e0b78
TM		 1083err_put_state_owner:
1084 nfs4_put_state_owner(sp);
1da177e4 1085out_err:
1da177e4
LT		 1086 *res = NULL;
1087 return status;
1088}
1089
1090
ad389da7 1091static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1092{
1093 struct nfs4_exception exception = { };
1094 struct nfs4_state *res;
1095 int status;
1096
1097 do {
ad389da7 1098 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1099 if (status == 0)
1100 break;
1101 /* NOTE: BAD_SEQID means the server and client disagree about the
1102 * book-keeping w.r.t. state-changing operations
1103 * (OPEN/CLOSE/LOCK/LOCKU...)
1104 * It is actually a sign of a bug on the client or on the server.
1105 *
1106 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1107 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1108 * have unhashed the old state_owner for us, and that we can
1109 * therefore safely retry using a new one. We should still warn
1110 * the user though...
1111 */
1112 if (status == -NFS4ERR_BAD_SEQID) {
6f43ddcc
TM		 1113 printk(KERN_WARNING "NFS: v4 server %s "
1114 " returned a bad sequence-id error!\n",
1115 NFS_SERVER(dir)->nfs_client->cl_hostname);
1da177e4
LT		 1116 exception.retry = 1;
1117 continue;
1118 }
550f5747
TM		 1119 /*
1120 * BAD_STATEID on OPEN means that the server cancelled our
1121 * state before it received the OPEN_CONFIRM.
1122 * Recover by retrying the request as per the discussion
1123 * on Page 181 of RFC3530.
1124 */
1125 if (status == -NFS4ERR_BAD_STATEID) {
1126 exception.retry = 1;
1127 continue;
1128 }
aac00a8d
TM		 1129 if (status == -EAGAIN) {
1130 /* We must have found a delegation */
1131 exception.retry = 1;
1132 continue;
1133 }
1da177e4
LT		 1134 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1135 status, &exception));
1136 } while (exception.retry);
1137 return res;
1138}
1139
659bfcd6
TM		 1140static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1141 struct nfs_fattr *fattr, struct iattr *sattr,
1142 struct nfs4_state *state)
1da177e4 1143{
3e4f6290 1144 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1145 struct nfs_setattrargs arg = {
3e4f6290 1146 .fh = NFS_FH(inode),
1da177e4
LT		 1147 .iap = sattr,
1148 .server = server,
1149 .bitmask = server->attr_bitmask,
1150 };
1151 struct nfs_setattrres res = {
1152 .fattr = fattr,
1153 .server = server,
1154 };
1155 struct rpc_message msg = {
659bfcd6
TM		 1156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1157 .rpc_argp = &arg,
1158 .rpc_resp = &res,
1159 .rpc_cred = cred,
1da177e4 1160 };
26e976a8 1161 unsigned long timestamp = jiffies;
65e4308d 1162 int status;
1da177e4 1163
0e574af1 1164 nfs_fattr_init(fattr);
1da177e4 1165
3e4f6290
TM		 1166 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1167 /* Use that stateid */
1168 } else if (state != NULL) {
08e9eac4
TM		 1169 nfs4_copy_stateid(&arg.stateid, state, current->files);
1170 } else
1da177e4
LT		 1171 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1172
65e4308d 1173 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1174 if (status == 0 && state != NULL)
1175 renew_lease(server, timestamp);
65e4308d 1176 return status;
1da177e4
LT		 1177}
1178
659bfcd6
TM		 1179static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1180 struct nfs_fattr *fattr, struct iattr *sattr,
1181 struct nfs4_state *state)
1da177e4 1182{
3e4f6290 1183 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1184 struct nfs4_exception exception = { };
1185 int err;
1186 do {
1187 err = nfs4_handle_exception(server,
659bfcd6 1188 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1da177e4
LT		 1189 &exception);
1190 } while (exception.retry);
1191 return err;
1192}
1193
1194struct nfs4_closedata {
4a35bd41 1195 struct path path;
1da177e4
LT		 1196 struct inode *inode;
1197 struct nfs4_state *state;
1198 struct nfs_closeargs arg;
1199 struct nfs_closeres res;
516a6af6 1200 struct nfs_fattr fattr;
26e976a8 1201 unsigned long timestamp;
1da177e4
LT		 1202};
1203
963d8fe5 1204static void nfs4_free_closedata(void *data)
9512135d 1205{
963d8fe5
TM		 1206 struct nfs4_closedata *calldata = data;
1207 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1208
1209 nfs4_put_open_state(calldata->state);
1210 nfs_free_seqid(calldata->arg.seqid);
9512135d 1211 nfs4_put_state_owner(sp);
31f31db1 1212 path_put(&calldata->path);
9512135d
TM		 1213 kfree(calldata);
1214}
1215
963d8fe5 1216static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1217{
963d8fe5 1218 struct nfs4_closedata *calldata = data;
1da177e4 1219 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1220 struct nfs_server *server = NFS_SERVER(calldata->inode);
1221
4ce70ada
TM		 1222 if (RPC_ASSASSINATED(task))
1223 return;
1da177e4
LT		 1224 /* hmm. we are done with the inode, and in the process of freeing
1225 * the state_owner. we keep this around to process errors
1226 */
1da177e4
LT		 1227 switch (task->tk_status) {
1228 case 0:
45328c35 1229 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
26e976a8 1230 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1231 break;
1232 case -NFS4ERR_STALE_STATEID:
1233 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1234 break;
1235 default:
1236 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1237 rpc_restart_call(task);
1238 return;
1239 }
1240 }
516a6af6 1241 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1242}
1243
4ce70ada 1244static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1245{
4ce70ada 1246 struct nfs4_closedata *calldata = data;
9512135d 1247 struct nfs4_state *state = calldata->state;
003707c7 1248 int clear_rd, clear_wr, clear_rdwr;
9512135d 1249
963d8fe5 1250 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1251 return;
003707c7 1252
003707c7 1253 clear_rd = clear_wr = clear_rdwr = 0;
4cecb76f 1254 spin_lock(&state->owner->so_lock);
003707c7 1255 /* Calculate the change in open mode */
e7616923 1256 if (state->n_rdwr == 0) {
003707c7 1257 if (state->n_rdonly == 0) {
003707c7
TM		 1258 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1259 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1260 }
1261 if (state->n_wronly == 0) {
003707c7
TM		 1262 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1263 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1264 }
e7616923 1265 }
4cecb76f 1266 spin_unlock(&state->owner->so_lock);
003707c7 1267 if (!clear_rd && !clear_wr && !clear_rdwr) {
963d8fe5
TM		 1268 /* Note: exit _without_ calling nfs4_close_done */
1269 task->tk_action = NULL;
9512135d
TM		 1270 return;
1271 }
516a6af6 1272 nfs_fattr_init(calldata->res.fattr);
45328c35 1273 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
5138fde0 1274 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1275 calldata->arg.open_flags = FMODE_READ;
1276 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
5138fde0 1277 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1278 calldata->arg.open_flags = FMODE_WRITE;
1279 }
26e976a8 1280 calldata->timestamp = jiffies;
5138fde0 1281 rpc_call_start(task);
1da177e4
LT		 1282}
1283
963d8fe5 1284static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1285 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1286 .rpc_call_done = nfs4_close_done,
1287 .rpc_release = nfs4_free_closedata,
1288};
1289
1da177e4
LT		 1290/*
1291 * It is possible for data to be read/written from a mem-mapped file
1292 * after the sys_close call (which hits the vfs layer as a flush).
1293 * This means that we can't safely call nfsv4 close on a file until
1294 * the inode is cleared. This in turn means that we are not good
1295 * NFSv4 citizens - we do not indicate to the server to update the file's
1296 * share state even when we are done with one of the three share
1297 * stateid's in the inode.
1298 *
1299 * NOTE: Caller must be holding the sp->so_owner semaphore!
1300 */
a49c3c77 1301int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1da177e4 1302{
4a35bd41 1303 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4 1304 struct nfs4_closedata *calldata;
b39e625b
TM		 1305 struct nfs4_state_owner *sp = state->owner;
1306 struct rpc_task *task;
5138fde0
TM		 1307 struct rpc_message msg = {
1308 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1309 .rpc_cred = state->owner->so_cred,
1310 };
c970aa85
TM		 1311 struct rpc_task_setup task_setup_data = {
1312 .rpc_client = server->client,
5138fde0 1313 .rpc_message = &msg,
c970aa85 1314 .callback_ops = &nfs4_close_ops,
101070ca 1315 .workqueue = nfsiod_workqueue,
c970aa85
TM		 1316 .flags = RPC_TASK_ASYNC,
1317 };
9512135d 1318 int status = -ENOMEM;
1da177e4 1319
9512135d 1320 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1321 if (calldata == NULL)
9512135d 1322 goto out;
4a35bd41 1323 calldata->inode = state->inode;
1da177e4 1324 calldata->state = state;
4a35bd41 1325 calldata->arg.fh = NFS_FH(state->inode);
003707c7 1326 calldata->arg.stateid = &state->open_stateid;
1da177e4 1327 /* Serialization for the sequence id */
cee54fc9 1328 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1329 if (calldata->arg.seqid == NULL)
1330 goto out_free_calldata;
516a6af6
TM		 1331 calldata->arg.bitmask = server->attr_bitmask;
1332 calldata->res.fattr = &calldata->fattr;
c1d51931 1333 calldata->res.seqid = calldata->arg.seqid;
516a6af6 1334 calldata->res.server = server;
4a35bd41
TM		 1335 calldata->path.mnt = mntget(path->mnt);
1336 calldata->path.dentry = dget(path->dentry);
9512135d 1337
5138fde0
TM		 1338 msg.rpc_argp = &calldata->arg,
1339 msg.rpc_resp = &calldata->res,
c970aa85
TM		 1340 task_setup_data.callback_data = calldata;
1341 task = rpc_run_task(&task_setup_data);
b39e625b
TM		 1342 if (IS_ERR(task))
1343 return PTR_ERR(task);
a49c3c77
TM		 1344 status = 0;
1345 if (wait)
1346 status = rpc_wait_for_completion_task(task);
b39e625b 1347 rpc_put_task(task);
a49c3c77 1348 return status;
9512135d
TM		 1349out_free_calldata:
1350 kfree(calldata);
1351out:
b39e625b
TM		 1352 nfs4_put_open_state(state);
1353 nfs4_put_state_owner(sp);
9512135d 1354 return status;
1da177e4
LT		 1355}
1356
4a35bd41 1357static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
02a913a7
TM		 1358{
1359 struct file *filp;
1b45c46c 1360 int ret;
02a913a7 1361
1b45c46c
TM		 1362 /* If the open_intent is for execute, we have an extra check to make */
1363 if (nd->intent.open.flags & FMODE_EXEC) {
af22f94a 1364 ret = nfs_may_open(state->inode,
1b45c46c
TM		 1365 state->owner->so_cred,
1366 nd->intent.open.flags);
1367 if (ret < 0)
1368 goto out_close;
1369 }
4a35bd41 1370 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
02a913a7
TM		 1371 if (!IS_ERR(filp)) {
1372 struct nfs_open_context *ctx;
cd3758e3 1373 ctx = nfs_file_open_context(filp);
02a913a7 1374 ctx->state = state;
95cf959b
TM		 1375 return 0;
1376 }
1b45c46c
TM		 1377 ret = PTR_ERR(filp);
1378out_close:
a49c3c77 1379 nfs4_close_sync(path, state, nd->intent.open.flags);
1b45c46c 1380 return ret;
02a913a7
TM		 1381}
1382
1383struct dentry *
1da177e4
LT		 1384nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1385{
ad389da7 1386 struct path path = {
4ac91378 1387 .mnt = nd->path.mnt,
ad389da7
TM		 1388 .dentry = dentry,
1389 };
4ac91378 1390 struct dentry *parent;
1da177e4
LT		 1391 struct iattr attr;
1392 struct rpc_cred *cred;
1393 struct nfs4_state *state;
02a913a7 1394 struct dentry *res;
1da177e4
LT		 1395
1396 if (nd->flags & LOOKUP_CREATE) {
1397 attr.ia_mode = nd->intent.open.create_mode;
1398 attr.ia_valid = ATTR_MODE;
1399 if (!IS_POSIXACL(dir))
1400 attr.ia_mode &= ~current->fs->umask;
1401 } else {
1402 attr.ia_valid = 0;
1403 BUG_ON(nd->intent.open.flags & O_CREAT);
1404 }
1405
98a8e323 1406 cred = rpc_lookup_cred();
1da177e4 1407 if (IS_ERR(cred))
02a913a7 1408 return (struct dentry *)cred;
565277f6
TM		 1409 parent = dentry->d_parent;
1410 /* Protect against concurrent sillydeletes */
1411 nfs_block_sillyrename(parent);
ad389da7 1412 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1413 put_rpccred(cred);
02a913a7 1414 if (IS_ERR(state)) {
d75340cc 1415 if (PTR_ERR(state) == -ENOENT) {
02a913a7 1416 d_add(dentry, NULL);
d75340cc
TM		 1417 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1418 }
565277f6 1419 nfs_unblock_sillyrename(parent);
02a913a7
TM		 1420 return (struct dentry *)state;
1421 }
24ac23ab 1422 res = d_add_unique(dentry, igrab(state->inode));
02a913a7 1423 if (res != NULL)
deee9369 1424 path.dentry = res;
d75340cc 1425 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
565277f6 1426 nfs_unblock_sillyrename(parent);
4a35bd41 1427 nfs4_intent_set_file(nd, &path, state);
02a913a7 1428 return res;
1da177e4
LT		 1429}
1430
1431int
02a913a7 1432nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1433{
ad389da7 1434 struct path path = {
4ac91378 1435 .mnt = nd->path.mnt,
ad389da7
TM		 1436 .dentry = dentry,
1437 };
1da177e4
LT		 1438 struct rpc_cred *cred;
1439 struct nfs4_state *state;
1da177e4 1440
98a8e323 1441 cred = rpc_lookup_cred();
1da177e4
LT		 1442 if (IS_ERR(cred))
1443 return PTR_ERR(cred);
aac00a8d 1444 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1445 put_rpccred(cred);
02a913a7
TM		 1446 if (IS_ERR(state)) {
1447 switch (PTR_ERR(state)) {
1448 case -EPERM:
1449 case -EACCES:
1450 case -EDQUOT:
1451 case -ENOSPC:
1452 case -EROFS:
1453 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1454 return 1;
b87c0adf
CL		 1455 default:
1456 goto out_drop;
02a913a7 1457 }
02a913a7 1458 }
24ac23ab 1459 if (state->inode == dentry->d_inode) {
d75340cc 1460 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
4a35bd41 1461 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1462 return 1;
1463 }
a49c3c77 1464 nfs4_close_sync(&path, state, openflags);
02a913a7
TM		 1465out_drop:
1466 d_drop(dentry);
1da177e4
LT		 1467 return 0;
1468}
1469
1470
1471static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1472{
1473 struct nfs4_server_caps_res res = {};
1474 struct rpc_message msg = {
1475 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1476 .rpc_argp = fhandle,
1477 .rpc_resp = &res,
1478 };
1479 int status;
1480
1481 status = rpc_call_sync(server->client, &msg, 0);
1482 if (status == 0) {
1483 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1484 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1485 server->caps |= NFS_CAP_ACLS;
1486 if (res.has_links != 0)
1487 server->caps |= NFS_CAP_HARDLINKS;
1488 if (res.has_symlinks != 0)
1489 server->caps |= NFS_CAP_SYMLINKS;
1490 server->acl_bitmask = res.acl_bitmask;
1491 }
1492 return status;
1493}
1494
55a97593 1495int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1496{
1497 struct nfs4_exception exception = { };
1498 int err;
1499 do {
1500 err = nfs4_handle_exception(server,
1501 _nfs4_server_capabilities(server, fhandle),
1502 &exception);
1503 } while (exception.retry);
1504 return err;
1505}
1506
1507static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1508 struct nfs_fsinfo *info)
1509{
1da177e4
LT		 1510 struct nfs4_lookup_root_arg args = {
1511 .bitmask = nfs4_fattr_bitmap,
1512 };
1513 struct nfs4_lookup_res res = {
1514 .server = server,
0e574af1 1515 .fattr = info->fattr,
1da177e4
LT		 1516 .fh = fhandle,
1517 };
1518 struct rpc_message msg = {
1519 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1520 .rpc_argp = &args,
1521 .rpc_resp = &res,
1522 };
0e574af1 1523 nfs_fattr_init(info->fattr);
1da177e4
LT		 1524 return rpc_call_sync(server->client, &msg, 0);
1525}
1526
1527static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1528 struct nfs_fsinfo *info)
1529{
1530 struct nfs4_exception exception = { };
1531 int err;
1532 do {
1533 err = nfs4_handle_exception(server,
1534 _nfs4_lookup_root(server, fhandle, info),
1535 &exception);
1536 } while (exception.retry);
1537 return err;
1538}
1539
54ceac45
DH		 1540/*
1541 * get the file handle for the "/" directory on the server
1542 */
1da177e4 1543static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1544 struct nfs_fsinfo *info)
1da177e4 1545{
1da177e4
LT		 1546 int status;
1547
1da177e4 1548 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1549 if (status == 0)
1550 status = nfs4_server_capabilities(server, fhandle);
1551 if (status == 0)
1552 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1553 return nfs4_map_errors(status);
1da177e4
LT		 1554}
1555
6b97fd3d
MN		 1556/*
1557 * Get locations and (maybe) other attributes of a referral.
1558 * Note that we'll actually follow the referral later when
1559 * we detect fsid mismatch in inode revalidation
1560 */
56659e99 1561static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
6b97fd3d
MN		 1562{
1563 int status = -ENOMEM;
1564 struct page *page = NULL;
1565 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1566
1567 page = alloc_page(GFP_KERNEL);
1568 if (page == NULL)
1569 goto out;
1570 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1571 if (locations == NULL)
1572 goto out;
1573
c228fd3a 1574 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1575 if (status != 0)
1576 goto out;
1577 /* Make sure server returned a different fsid for the referral */
1578 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3110ff80 1579 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
6b97fd3d
MN		 1580 status = -EIO;
1581 goto out;
1582 }
1583
1584 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1585 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1586 if (!fattr->mode)
1587 fattr->mode = S_IFDIR;
1588 memset(fhandle, 0, sizeof(struct nfs_fh));
1589out:
1590 if (page)
1591 __free_page(page);
1592 if (locations)
1593 kfree(locations);
1594 return status;
1595}
1596
1da177e4
LT		 1597static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1598{
1599 struct nfs4_getattr_arg args = {
1600 .fh = fhandle,
1601 .bitmask = server->attr_bitmask,
1602 };
1603 struct nfs4_getattr_res res = {
1604 .fattr = fattr,
1605 .server = server,
1606 };
1607 struct rpc_message msg = {
1608 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1609 .rpc_argp = &args,
1610 .rpc_resp = &res,
1611 };
1612
0e574af1 1613 nfs_fattr_init(fattr);
1da177e4
LT		 1614 return rpc_call_sync(server->client, &msg, 0);
1615}
1616
1617static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1618{
1619 struct nfs4_exception exception = { };
1620 int err;
1621 do {
1622 err = nfs4_handle_exception(server,
1623 _nfs4_proc_getattr(server, fhandle, fattr),
1624 &exception);
1625 } while (exception.retry);
1626 return err;
1627}
1628
1629/*
1630 * The file is not closed if it is opened due to the a request to change
1631 * the size of the file. The open call will not be needed once the
1632 * VFS layer lookup-intents are implemented.
1633 *
1634 * Close is called when the inode is destroyed.
1635 * If we haven't opened the file for O_WRONLY, we
1636 * need to in the size_change case to obtain a stateid.
1637 *
1638 * Got race?
1639 * Because OPEN is always done by name in nfsv4, it is
1640 * possible that we opened a different file by the same
1641 * name. We can recognize this race condition, but we
1642 * can't do anything about it besides returning an error.
1643 *
1644 * This will be fixed with VFS changes (lookup-intent).
1645 */
1646static int
1647nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1648 struct iattr *sattr)
1649{
08e9eac4 1650 struct inode *inode = dentry->d_inode;
659bfcd6 1651 struct rpc_cred *cred = NULL;
d530838b 1652 struct nfs4_state *state = NULL;
1da177e4
LT		 1653 int status;
1654
0e574af1 1655 nfs_fattr_init(fattr);
1da177e4 1656
d530838b 1657 /* Search for an existing open(O_WRITE) file */
659bfcd6
TM		 1658 if (sattr->ia_valid & ATTR_FILE) {
1659 struct nfs_open_context *ctx;
1660
1661 ctx = nfs_file_open_context(sattr->ia_file);
1662 cred = ctx->cred;
d530838b 1663 state = ctx->state;
659bfcd6 1664 }
08e9eac4 1665
659bfcd6 1666 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
65e4308d
TM		 1667 if (status == 0)
1668 nfs_setattr_update_inode(inode, sattr);
1da177e4
LT		 1669 return status;
1670}
1671
56659e99
TM		 1672static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1673 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1674 struct nfs_fattr *fattr)
1675{
1676 int status;
1677 struct nfs4_lookup_arg args = {
1678 .bitmask = server->attr_bitmask,
1679 .dir_fh = dirfh,
1680 .name = name,
1681 };
1682 struct nfs4_lookup_res res = {
1683 .server = server,
1684 .fattr = fattr,
1685 .fh = fhandle,
1686 };
1687 struct rpc_message msg = {
1688 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1689 .rpc_argp = &args,
1690 .rpc_resp = &res,
1691 };
1692
1693 nfs_fattr_init(fattr);
1694
1695 dprintk("NFS call lookupfh %s\n", name->name);
1696 status = rpc_call_sync(server->client, &msg, 0);
1697 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1698 return status;
1699}
1700
1701static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1702 struct qstr *name, struct nfs_fh *fhandle,
1703 struct nfs_fattr *fattr)
1704{
1705 struct nfs4_exception exception = { };
1706 int err;
1707 do {
4e56e082
TM		 1708 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1709 /* FIXME: !!!! */
1710 if (err == -NFS4ERR_MOVED) {
1711 err = -EREMOTE;
1712 break;
1713 }
1714 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1715 } while (exception.retry);
1716 return err;
1717}
1718
56659e99 1719static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1720 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1721{
4e56e082 1722 int status;
1da177e4
LT		 1723
1724 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1725 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1726 if (status == -NFS4ERR_MOVED)
1727 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1728 dprintk("NFS reply lookup: %d\n", status);
1729 return status;
1730}
1731
1732static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1733{
1734 struct nfs4_exception exception = { };
1735 int err;
1736 do {
1737 err = nfs4_handle_exception(NFS_SERVER(dir),
1738 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1739 &exception);
1740 } while (exception.retry);
1741 return err;
1742}
1743
1744static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1745{
76b32999
TM		 1746 struct nfs_server *server = NFS_SERVER(inode);
1747 struct nfs_fattr fattr;
1da177e4
LT		 1748 struct nfs4_accessargs args = {
1749 .fh = NFS_FH(inode),
76b32999
TM		 1750 .bitmask = server->attr_bitmask,
1751 };
1752 struct nfs4_accessres res = {
1753 .server = server,
1754 .fattr = &fattr,
1da177e4 1755 };
1da177e4
LT		 1756 struct rpc_message msg = {
1757 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1758 .rpc_argp = &args,
1759 .rpc_resp = &res,
1760 .rpc_cred = entry->cred,
1761 };
1762 int mode = entry->mask;
1763 int status;
1764
1765 /*
1766 * Determine which access bits we want to ask for...
1767 */
1768 if (mode & MAY_READ)
1769 args.access |= NFS4_ACCESS_READ;
1770 if (S_ISDIR(inode->i_mode)) {
1771 if (mode & MAY_WRITE)
1772 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1773 if (mode & MAY_EXEC)
1774 args.access |= NFS4_ACCESS_LOOKUP;
1775 } else {
1776 if (mode & MAY_WRITE)
1777 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1778 if (mode & MAY_EXEC)
1779 args.access |= NFS4_ACCESS_EXECUTE;
1780 }
76b32999 1781 nfs_fattr_init(&fattr);
1da177e4
LT		 1782 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1783 if (!status) {
1784 entry->mask = 0;
1785 if (res.access & NFS4_ACCESS_READ)
1786 entry->mask |= MAY_READ;
1787 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1788 entry->mask |= MAY_WRITE;
1789 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1790 entry->mask |= MAY_EXEC;
76b32999 1791 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1792 }
1793 return status;
1794}
1795
1796static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1797{
1798 struct nfs4_exception exception = { };
1799 int err;
1800 do {
1801 err = nfs4_handle_exception(NFS_SERVER(inode),
1802 _nfs4_proc_access(inode, entry),
1803 &exception);
1804 } while (exception.retry);
1805 return err;
1806}
1807
1808/*
1809 * TODO: For the time being, we don't try to get any attributes
1810 * along with any of the zero-copy operations READ, READDIR,
1811 * READLINK, WRITE.
1812 *
1813 * In the case of the first three, we want to put the GETATTR
1814 * after the read-type operation -- this is because it is hard
1815 * to predict the length of a GETATTR response in v4, and thus
1816 * align the READ data correctly. This means that the GETATTR
1817 * may end up partially falling into the page cache, and we should
1818 * shift it into the 'tail' of the xdr_buf before processing.
1819 * To do this efficiently, we need to know the total length
1820 * of data received, which doesn't seem to be available outside
1821 * of the RPC layer.
1822 *
1823 * In the case of WRITE, we also want to put the GETATTR after
1824 * the operation -- in this case because we want to make sure
1825 * we get the post-operation mtime and size. This means that
1826 * we can't use xdr_encode_pages() as written: we need a variant
1827 * of it which would leave room in the 'tail' iovec.
1828 *
1829 * Both of these changes to the XDR layer would in fact be quite
1830 * minor, but I decided to leave them for a subsequent patch.
1831 */
1832static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1833 unsigned int pgbase, unsigned int pglen)
1834{
1835 struct nfs4_readlink args = {
1836 .fh = NFS_FH(inode),
1837 .pgbase = pgbase,
1838 .pglen = pglen,
1839 .pages = &page,
1840 };
1841 struct rpc_message msg = {
1842 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1843 .rpc_argp = &args,
1844 .rpc_resp = NULL,
1845 };
1846
1847 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1848}
1849
1850static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1851 unsigned int pgbase, unsigned int pglen)
1852{
1853 struct nfs4_exception exception = { };
1854 int err;
1855 do {
1856 err = nfs4_handle_exception(NFS_SERVER(inode),
1857 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1858 &exception);
1859 } while (exception.retry);
1860 return err;
1861}
1862
1da177e4
LT		 1863/*
1864 * Got race?
1865 * We will need to arrange for the VFS layer to provide an atomic open.
1866 * Until then, this create/open method is prone to inefficiency and race
1867 * conditions due to the lookup, create, and open VFS calls from sys_open()
1868 * placed on the wire.
1869 *
1870 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1871 * The file will be opened again in the subsequent VFS open call
1872 * (nfs4_proc_file_open).
1873 *
1874 * The open for read will just hang around to be used by any process that
1875 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1876 */
1877
1878static int
1879nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1880 int flags, struct nameidata *nd)
1da177e4 1881{
ad389da7 1882 struct path path = {
4ac91378 1883 .mnt = nd->path.mnt,
ad389da7
TM		 1884 .dentry = dentry,
1885 };
1da177e4
LT		 1886 struct nfs4_state *state;
1887 struct rpc_cred *cred;
1888 int status = 0;
1889
98a8e323 1890 cred = rpc_lookup_cred();
1da177e4
LT		 1891 if (IS_ERR(cred)) {
1892 status = PTR_ERR(cred);
1893 goto out;
1894 }
ad389da7 1895 state = nfs4_do_open(dir, &path, flags, sattr, cred);
d4d9cdcb 1896 d_drop(dentry);
1da177e4
LT		 1897 if (IS_ERR(state)) {
1898 status = PTR_ERR(state);
659bfcd6 1899 goto out_putcred;
1da177e4 1900 }
d4d9cdcb 1901 d_add(dentry, igrab(state->inode));
d75340cc 1902 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 1903 if (flags & O_EXCL) {
1904 struct nfs_fattr fattr;
659bfcd6 1905 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
02a913a7 1906 if (status == 0)
65e4308d 1907 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1908 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1909 }
ad389da7 1910 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1911 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1912 else
a49c3c77 1913 nfs4_close_sync(&path, state, flags);
659bfcd6
TM		 1914out_putcred:
1915 put_rpccred(cred);
1da177e4
LT		 1916out:
1917 return status;
1918}
1919
1920static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1921{
16e42959 1922 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 1923 struct nfs_removeargs args = {
1da177e4 1924 .fh = NFS_FH(dir),
4fdc17b2
TM		 1925 .name.len = name->len,
1926 .name.name = name->name,
16e42959
TM		 1927 .bitmask = server->attr_bitmask,
1928 };
4fdc17b2 1929 struct nfs_removeres res = {
16e42959 1930 .server = server,
1da177e4 1931 };
1da177e4 1932 struct rpc_message msg = {
4fdc17b2
TM		 1933 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1934 .rpc_argp = &args,
1935 .rpc_resp = &res,
1da177e4
LT		 1936 };
1937 int status;
1938
4fdc17b2 1939 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 1940 status = rpc_call_sync(server->client, &msg, 0);
1941 if (status == 0) {
1942 update_changeattr(dir, &res.cinfo);
4fdc17b2 1943 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 1944 }
1da177e4
LT		 1945 return status;
1946}
1947
1948static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1949{
1950 struct nfs4_exception exception = { };
1951 int err;
1952 do {
1953 err = nfs4_handle_exception(NFS_SERVER(dir),
1954 _nfs4_proc_remove(dir, name),
1955 &exception);
1956 } while (exception.retry);
1957 return err;
1958}
1959
e4eff1a6 1960static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 1961{
e4eff1a6
TM		 1962 struct nfs_server *server = NFS_SERVER(dir);
1963 struct nfs_removeargs *args = msg->rpc_argp;
1964 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 1965
e4eff1a6
TM		 1966 args->bitmask = server->attr_bitmask;
1967 res->server = server;
1da177e4 1968 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 1969}
1970
e4eff1a6 1971static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 1972{
e4eff1a6
TM		 1973 struct nfs_removeres *res = task->tk_msg.rpc_resp;
1974
1975 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1976 return 0;
1977 update_changeattr(dir, &res->cinfo);
1978 nfs_post_op_update_inode(dir, &res->dir_attr);
1979 return 1;
1da177e4
LT		 1980}
1981
1982static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1983 struct inode *new_dir, struct qstr *new_name)
1984{
6caf2c82 1985 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1986 struct nfs4_rename_arg arg = {
1987 .old_dir = NFS_FH(old_dir),
1988 .new_dir = NFS_FH(new_dir),
1989 .old_name = old_name,
1990 .new_name = new_name,
6caf2c82
TM		 1991 .bitmask = server->attr_bitmask,
1992 };
1993 struct nfs_fattr old_fattr, new_fattr;
1994 struct nfs4_rename_res res = {
1995 .server = server,
1996 .old_fattr = &old_fattr,
1997 .new_fattr = &new_fattr,
1da177e4 1998 };
1da177e4
LT		 1999 struct rpc_message msg = {
2000 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2001 .rpc_argp = &arg,
2002 .rpc_resp = &res,
2003 };
2004 int status;
2005
6caf2c82
TM		 2006 nfs_fattr_init(res.old_fattr);
2007 nfs_fattr_init(res.new_fattr);
2008 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2009
2010 if (!status) {
2011 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2012 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2013 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2014 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2015 }
2016 return status;
2017}
2018
2019static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2020 struct inode *new_dir, struct qstr *new_name)
2021{
2022 struct nfs4_exception exception = { };
2023 int err;
2024 do {
2025 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2026 _nfs4_proc_rename(old_dir, old_name,
2027 new_dir, new_name),
2028 &exception);
2029 } while (exception.retry);
2030 return err;
2031}
2032
2033static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2034{
91ba2eee 2035 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2036 struct nfs4_link_arg arg = {
2037 .fh = NFS_FH(inode),
2038 .dir_fh = NFS_FH(dir),
2039 .name = name,
91ba2eee
TM		 2040 .bitmask = server->attr_bitmask,
2041 };
2042 struct nfs_fattr fattr, dir_attr;
2043 struct nfs4_link_res res = {
2044 .server = server,
2045 .fattr = &fattr,
2046 .dir_attr = &dir_attr,
1da177e4 2047 };
1da177e4
LT		 2048 struct rpc_message msg = {
2049 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2050 .rpc_argp = &arg,
91ba2eee 2051 .rpc_resp = &res,
1da177e4
LT		 2052 };
2053 int status;
2054
91ba2eee
TM		 2055 nfs_fattr_init(res.fattr);
2056 nfs_fattr_init(res.dir_attr);
2057 status = rpc_call_sync(server->client, &msg, 0);
2058 if (!status) {
2059 update_changeattr(dir, &res.cinfo);
2060 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2061 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2062 }
1da177e4
LT		 2063
2064 return status;
2065}
2066
2067static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2068{
2069 struct nfs4_exception exception = { };
2070 int err;
2071 do {
2072 err = nfs4_handle_exception(NFS_SERVER(inode),
2073 _nfs4_proc_link(inode, dir, name),
2074 &exception);
2075 } while (exception.retry);
2076 return err;
2077}
2078
57dc9a57
TM		 2079struct nfs4_createdata {
2080 struct rpc_message msg;
2081 struct nfs4_create_arg arg;
2082 struct nfs4_create_res res;
2083 struct nfs_fh fh;
2084 struct nfs_fattr fattr;
2085 struct nfs_fattr dir_fattr;
2086};
2087
2088static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2089 struct qstr *name, struct iattr *sattr, u32 ftype)
2090{
2091 struct nfs4_createdata *data;
2092
2093 data = kzalloc(sizeof(*data), GFP_KERNEL);
2094 if (data != NULL) {
2095 struct nfs_server *server = NFS_SERVER(dir);
2096
2097 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2098 data->msg.rpc_argp = &data->arg;
2099 data->msg.rpc_resp = &data->res;
2100 data->arg.dir_fh = NFS_FH(dir);
2101 data->arg.server = server;
2102 data->arg.name = name;
2103 data->arg.attrs = sattr;
2104 data->arg.ftype = ftype;
2105 data->arg.bitmask = server->attr_bitmask;
2106 data->res.server = server;
2107 data->res.fh = &data->fh;
2108 data->res.fattr = &data->fattr;
2109 data->res.dir_fattr = &data->dir_fattr;
2110 nfs_fattr_init(data->res.fattr);
2111 nfs_fattr_init(data->res.dir_fattr);
2112 }
2113 return data;
2114}
2115
2116static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2117{
2118 int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2119 if (status == 0) {
2120 update_changeattr(dir, &data->res.dir_cinfo);
2121 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2122 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2123 }
2124 return status;
2125}
2126
2127static void nfs4_free_createdata(struct nfs4_createdata *data)
2128{
2129 kfree(data);
2130}
2131
4f390c15 2132static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2133 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4 2134{
57dc9a57
TM		 2135 struct nfs4_createdata *data;
2136 int status = -ENAMETOOLONG;
1da177e4 2137
94a6d753 2138 if (len > NFS4_MAXPATHLEN)
57dc9a57 2139 goto out;
4f390c15 2140
57dc9a57
TM		 2141 status = -ENOMEM;
2142 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2143 if (data == NULL)
2144 goto out;
2145
2146 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2147 data->arg.u.symlink.pages = &page;
2148 data->arg.u.symlink.len = len;
1da177e4 2149
57dc9a57
TM		 2150 status = nfs4_do_create(dir, dentry, data);
2151
2152 nfs4_free_createdata(data);
2153out:
1da177e4
LT		 2154 return status;
2155}
2156
4f390c15 2157static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2158 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2159{
2160 struct nfs4_exception exception = { };
2161 int err;
2162 do {
2163 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2164 _nfs4_proc_symlink(dir, dentry, page,
2165 len, sattr),
1da177e4
LT		 2166 &exception);
2167 } while (exception.retry);
2168 return err;
2169}
2170
2171static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2172 struct iattr *sattr)
2173{
57dc9a57
TM		 2174 struct nfs4_createdata *data;
2175 int status = -ENOMEM;
1da177e4 2176
57dc9a57
TM		 2177 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2178 if (data == NULL)
2179 goto out;
2180
2181 status = nfs4_do_create(dir, dentry, data);
2182
2183 nfs4_free_createdata(data);
2184out:
1da177e4
LT		 2185 return status;
2186}
2187
2188static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2189 struct iattr *sattr)
2190{
2191 struct nfs4_exception exception = { };
2192 int err;
2193 do {
2194 err = nfs4_handle_exception(NFS_SERVER(dir),
2195 _nfs4_proc_mkdir(dir, dentry, sattr),
2196 &exception);
2197 } while (exception.retry);
2198 return err;
2199}
2200
2201static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2202 u64 cookie, struct page *page, unsigned int count, int plus)
2203{
2204 struct inode *dir = dentry->d_inode;
2205 struct nfs4_readdir_arg args = {
2206 .fh = NFS_FH(dir),
2207 .pages = &page,
2208 .pgbase = 0,
2209 .count = count,
2210 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2211 };
2212 struct nfs4_readdir_res res;
2213 struct rpc_message msg = {
2214 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2215 .rpc_argp = &args,
2216 .rpc_resp = &res,
2217 .rpc_cred = cred,
2218 };
2219 int status;
2220
3110ff80 2221 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
eadf4598
TM		 2222 dentry->d_parent->d_name.name,
2223 dentry->d_name.name,
2224 (unsigned long long)cookie);
1da177e4
LT		 2225 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2226 res.pgbase = args.pgbase;
2227 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2228 if (status == 0)
2229 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2230
2231 nfs_invalidate_atime(dir);
2232
3110ff80 2233 dprintk("%s: returns %d\n", __func__, status);
1da177e4
LT		 2234 return status;
2235}
2236
2237static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2238 u64 cookie, struct page *page, unsigned int count, int plus)
2239{
2240 struct nfs4_exception exception = { };
2241 int err;
2242 do {
2243 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2244 _nfs4_proc_readdir(dentry, cred, cookie,
2245 page, count, plus),
2246 &exception);
2247 } while (exception.retry);
2248 return err;
2249}
2250
2251static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2252 struct iattr *sattr, dev_t rdev)
2253{
57dc9a57
TM		 2254 struct nfs4_createdata *data;
2255 int mode = sattr->ia_mode;
2256 int status = -ENOMEM;
1da177e4
LT		 2257
2258 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2259 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
57dc9a57
TM		 2260
2261 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2262 if (data == NULL)
2263 goto out;
2264
1da177e4 2265 if (S_ISFIFO(mode))
57dc9a57 2266 data->arg.ftype = NF4FIFO;
1da177e4 2267 else if (S_ISBLK(mode)) {
57dc9a57
TM		 2268 data->arg.ftype = NF4BLK;
2269 data->arg.u.device.specdata1 = MAJOR(rdev);
2270 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4
LT		 2271 }
2272 else if (S_ISCHR(mode)) {
57dc9a57
TM		 2273 data->arg.ftype = NF4CHR;
2274 data->arg.u.device.specdata1 = MAJOR(rdev);
2275 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4 2276 }
1da177e4 2277
57dc9a57
TM		 2278 status = nfs4_do_create(dir, dentry, data);
2279
2280 nfs4_free_createdata(data);
2281out:
1da177e4
LT		 2282 return status;
2283}
2284
2285static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2286 struct iattr *sattr, dev_t rdev)
2287{
2288 struct nfs4_exception exception = { };
2289 int err;
2290 do {
2291 err = nfs4_handle_exception(NFS_SERVER(dir),
2292 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2293 &exception);
2294 } while (exception.retry);
2295 return err;
2296}
2297
2298static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2299 struct nfs_fsstat *fsstat)
2300{
2301 struct nfs4_statfs_arg args = {
2302 .fh = fhandle,
2303 .bitmask = server->attr_bitmask,
2304 };
2305 struct rpc_message msg = {
2306 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2307 .rpc_argp = &args,
2308 .rpc_resp = fsstat,
2309 };
2310
0e574af1 2311 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2312 return rpc_call_sync(server->client, &msg, 0);
2313}
2314
2315static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2316{
2317 struct nfs4_exception exception = { };
2318 int err;
2319 do {
2320 err = nfs4_handle_exception(server,
2321 _nfs4_proc_statfs(server, fhandle, fsstat),
2322 &exception);
2323 } while (exception.retry);
2324 return err;
2325}
2326
2327static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2328 struct nfs_fsinfo *fsinfo)
2329{
2330 struct nfs4_fsinfo_arg args = {
2331 .fh = fhandle,
2332 .bitmask = server->attr_bitmask,
2333 };
2334 struct rpc_message msg = {
2335 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2336 .rpc_argp = &args,
2337 .rpc_resp = fsinfo,
2338 };
2339
2340 return rpc_call_sync(server->client, &msg, 0);
2341}
2342
2343static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2344{
2345 struct nfs4_exception exception = { };
2346 int err;
2347
2348 do {
2349 err = nfs4_handle_exception(server,
2350 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2351 &exception);
2352 } while (exception.retry);
2353 return err;
2354}
2355
2356static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2357{
0e574af1 2358 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2359 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2360}
2361
2362static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2363 struct nfs_pathconf *pathconf)
2364{
2365 struct nfs4_pathconf_arg args = {
2366 .fh = fhandle,
2367 .bitmask = server->attr_bitmask,
2368 };
2369 struct rpc_message msg = {
2370 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2371 .rpc_argp = &args,
2372 .rpc_resp = pathconf,
2373 };
2374
2375 /* None of the pathconf attributes are mandatory to implement */
2376 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2377 memset(pathconf, 0, sizeof(*pathconf));
2378 return 0;
2379 }
2380
0e574af1 2381 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2382 return rpc_call_sync(server->client, &msg, 0);
2383}
2384
2385static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2386 struct nfs_pathconf *pathconf)
2387{
2388 struct nfs4_exception exception = { };
2389 int err;
2390
2391 do {
2392 err = nfs4_handle_exception(server,
2393 _nfs4_proc_pathconf(server, fhandle, pathconf),
2394 &exception);
2395 } while (exception.retry);
2396 return err;
2397}
2398
ec06c096 2399static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2400{
ec06c096 2401 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2402
ec06c096 2403 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2404 rpc_restart_call(task);
ec06c096 2405 return -EAGAIN;
1da177e4 2406 }
8850df99
TM		 2407
2408 nfs_invalidate_atime(data->inode);
1da177e4 2409 if (task->tk_status > 0)
ec06c096
TM		 2410 renew_lease(server, data->timestamp);
2411 return 0;
1da177e4
LT		 2412}
2413
bdc7f021 2414static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
1da177e4 2415{
1da177e4 2416 data->timestamp = jiffies;
bdc7f021 2417 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
1da177e4
LT		 2418}
2419
788e7a89 2420static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2421{
1da177e4
LT		 2422 struct inode *inode = data->inode;
2423
2424 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2425 rpc_restart_call(task);
788e7a89 2426 return -EAGAIN;
1da177e4 2427 }
4f9838c7 2428 if (task->tk_status >= 0) {
1da177e4 2429 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2430 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2431 }
788e7a89 2432 return 0;
1da177e4
LT		 2433}
2434
bdc7f021 2435static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2436{
bdc7f021
TM		 2437 struct nfs_server *server = NFS_SERVER(data->inode);
2438
4f9838c7
TM		 2439 data->args.bitmask = server->attr_bitmask;
2440 data->res.server = server;
1da177e4
LT		 2441 data->timestamp = jiffies;
2442
bdc7f021 2443 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
1da177e4
LT		 2444}
2445
788e7a89 2446static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2447{
1da177e4
LT		 2448 struct inode *inode = data->inode;
2449
2450 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2451 rpc_restart_call(task);
788e7a89 2452 return -EAGAIN;
1da177e4 2453 }
9e08a3c5 2454 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2455 return 0;
1da177e4
LT		 2456}
2457
bdc7f021 2458static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2459{
788e7a89 2460 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2461
4f9838c7
TM		 2462 data->args.bitmask = server->attr_bitmask;
2463 data->res.server = server;
bdc7f021 2464 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
1da177e4
LT		 2465}
2466
2467/*
2468 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2469 * standalone procedure for queueing an asynchronous RENEW.
2470 */
963d8fe5 2471static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2472{
adfa6f98 2473 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2474 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2475
2476 if (task->tk_status < 0) {
2477 switch (task->tk_status) {
2478 case -NFS4ERR_STALE_CLIENTID:
2479 case -NFS4ERR_EXPIRED:
2480 case -NFS4ERR_CB_PATH_DOWN:
2481 nfs4_schedule_state_recovery(clp);
2482 }
2483 return;
2484 }
2485 spin_lock(&clp->cl_lock);
2486 if (time_before(clp->cl_last_renewal,timestamp))
2487 clp->cl_last_renewal = timestamp;
2488 spin_unlock(&clp->cl_lock);
2489}
2490
963d8fe5
TM		 2491static const struct rpc_call_ops nfs4_renew_ops = {
2492 .rpc_call_done = nfs4_renew_done,
2493};
2494
adfa6f98 2495int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2496{
2497 struct rpc_message msg = {
2498 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2499 .rpc_argp = clp,
b4454fe1 2500 .rpc_cred = cred,
1da177e4
LT		 2501 };
2502
2503 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2504 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2505}
2506
adfa6f98 2507int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2508{
2509 struct rpc_message msg = {
2510 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2511 .rpc_argp = clp,
b4454fe1 2512 .rpc_cred = cred,
1da177e4
LT		 2513 };
2514 unsigned long now = jiffies;
2515 int status;
2516
2517 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2518 if (status < 0)
2519 return status;
2520 spin_lock(&clp->cl_lock);
2521 if (time_before(clp->cl_last_renewal,now))
2522 clp->cl_last_renewal = now;
2523 spin_unlock(&clp->cl_lock);
2524 return 0;
2525}
2526
aa1870af
BF		 2527static inline int nfs4_server_supports_acls(struct nfs_server *server)
2528{
2529 return (server->caps & NFS_CAP_ACLS)
2530 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2531 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2532}
2533
2534/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2535 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2536 * the stack.
2537 */
2538#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2539
2540static void buf_to_pages(const void *buf, size_t buflen,
2541 struct page **pages, unsigned int *pgbase)
2542{
2543 const void *p = buf;
2544
2545 *pgbase = offset_in_page(buf);
2546 p -= *pgbase;
2547 while (p < buf + buflen) {
2548 *(pages++) = virt_to_page(p);
2549 p += PAGE_CACHE_SIZE;
2550 }
2551}
2552
e50a1c2e
BF		 2553struct nfs4_cached_acl {
2554 int cached;
2555 size_t len;
3e9d4154 2556 char data[0];
e50a1c2e
BF		 2557};
2558
2559static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2560{
2561 struct nfs_inode *nfsi = NFS_I(inode);
2562
2563 spin_lock(&inode->i_lock);
2564 kfree(nfsi->nfs4_acl);
2565 nfsi->nfs4_acl = acl;
2566 spin_unlock(&inode->i_lock);
2567}
2568
2569static void nfs4_zap_acl_attr(struct inode *inode)
2570{
2571 nfs4_set_cached_acl(inode, NULL);
2572}
2573
2574static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2575{
2576 struct nfs_inode *nfsi = NFS_I(inode);
2577 struct nfs4_cached_acl *acl;
2578 int ret = -ENOENT;
2579
2580 spin_lock(&inode->i_lock);
2581 acl = nfsi->nfs4_acl;
2582 if (acl == NULL)
2583 goto out;
2584 if (buf == NULL) /* user is just asking for length */
2585 goto out_len;
2586 if (acl->cached == 0)
2587 goto out;
2588 ret = -ERANGE; /* see getxattr(2) man page */
2589 if (acl->len > buflen)
2590 goto out;
2591 memcpy(buf, acl->data, acl->len);
2592out_len:
2593 ret = acl->len;
2594out:
2595 spin_unlock(&inode->i_lock);
2596 return ret;
2597}
2598
2599static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2600{
2601 struct nfs4_cached_acl *acl;
2602
2603 if (buf && acl_len <= PAGE_SIZE) {
2604 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2605 if (acl == NULL)
2606 goto out;
2607 acl->cached = 1;
2608 memcpy(acl->data, buf, acl_len);
2609 } else {
2610 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2611 if (acl == NULL)
2612 goto out;
2613 acl->cached = 0;
2614 }
2615 acl->len = acl_len;
2616out:
2617 nfs4_set_cached_acl(inode, acl);
2618}
2619
16b4289c 2620static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2621{
aa1870af
BF		 2622 struct page *pages[NFS4ACL_MAXPAGES];
2623 struct nfs_getaclargs args = {
2624 .fh = NFS_FH(inode),
2625 .acl_pages = pages,
2626 .acl_len = buflen,
2627 };
2628 size_t resp_len = buflen;
e50a1c2e 2629 void *resp_buf;
aa1870af
BF		 2630 struct rpc_message msg = {
2631 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2632 .rpc_argp = &args,
2633 .rpc_resp = &resp_len,
2634 };
e50a1c2e 2635 struct page *localpage = NULL;
aa1870af
BF		 2636 int ret;
2637
e50a1c2e
BF		 2638 if (buflen < PAGE_SIZE) {
2639 /* As long as we're doing a round trip to the server anyway,
2640 * let's be prepared for a page of acl data. */
2641 localpage = alloc_page(GFP_KERNEL);
2642 resp_buf = page_address(localpage);
2643 if (localpage == NULL)
2644 return -ENOMEM;
2645 args.acl_pages[0] = localpage;
2646 args.acl_pgbase = 0;
1d95db8e 2647 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2648 } else {
2649 resp_buf = buf;
2650 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2651 }
aa1870af 2652 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2653 if (ret)
2654 goto out_free;
2655 if (resp_len > args.acl_len)
2656 nfs4_write_cached_acl(inode, NULL, resp_len);
2657 else
2658 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2659 if (buf) {
2660 ret = -ERANGE;
2661 if (resp_len > buflen)
2662 goto out_free;
2663 if (localpage)
2664 memcpy(buf, resp_buf, resp_len);
2665 }
2666 ret = resp_len;
2667out_free:
2668 if (localpage)
2669 __free_page(localpage);
aa1870af
BF		 2670 return ret;
2671}
2672
16b4289c
TM		 2673static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2674{
2675 struct nfs4_exception exception = { };
2676 ssize_t ret;
2677 do {
2678 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2679 if (ret >= 0)
2680 break;
2681 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2682 } while (exception.retry);
2683 return ret;
2684}
2685
e50a1c2e
BF		 2686static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2687{
2688 struct nfs_server *server = NFS_SERVER(inode);
2689 int ret;
2690
2691 if (!nfs4_server_supports_acls(server))
2692 return -EOPNOTSUPP;
2693 ret = nfs_revalidate_inode(server, inode);
2694 if (ret < 0)
2695 return ret;
f41f7418
TM		 2696 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2697 nfs_zap_acl_cache(inode);
e50a1c2e
BF		 2698 ret = nfs4_read_cached_acl(inode, buf, buflen);
2699 if (ret != -ENOENT)
2700 return ret;
2701 return nfs4_get_acl_uncached(inode, buf, buflen);
2702}
2703
16b4289c 2704static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2705{
2706 struct nfs_server *server = NFS_SERVER(inode);
2707 struct page *pages[NFS4ACL_MAXPAGES];
2708 struct nfs_setaclargs arg = {
2709 .fh = NFS_FH(inode),
2710 .acl_pages = pages,
2711 .acl_len = buflen,
2712 };
2713 struct rpc_message msg = {
2714 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2715 .rpc_argp = &arg,
2716 .rpc_resp = NULL,
2717 };
2718 int ret;
2719
2720 if (!nfs4_server_supports_acls(server))
2721 return -EOPNOTSUPP;
642ac549 2722 nfs_inode_return_delegation(inode);
4b580ee3 2723 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2724 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
f41f7418
TM		 2725 nfs_access_zap_cache(inode);
2726 nfs_zap_acl_cache(inode);
4b580ee3
BF		 2727 return ret;
2728}
2729
16b4289c
TM		 2730static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2731{
2732 struct nfs4_exception exception = { };
2733 int err;
2734 do {
2735 err = nfs4_handle_exception(NFS_SERVER(inode),
2736 __nfs4_proc_set_acl(inode, buf, buflen),
2737 &exception);
2738 } while (exception.retry);
2739 return err;
2740}
2741
1da177e4 2742static int
faf5f49c 2743nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2744{
7539bbab 2745 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2746
2747 if (!clp || task->tk_status >= 0)
2748 return 0;
2749 switch(task->tk_status) {
2750 case -NFS4ERR_STALE_CLIENTID:
2751 case -NFS4ERR_STALE_STATEID:
2752 case -NFS4ERR_EXPIRED:
5d00837b 2753 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
1da177e4 2754 nfs4_schedule_state_recovery(clp);
433fbe4c 2755 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
fda13939 2756 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
1da177e4
LT		 2757 task->tk_status = 0;
2758 return -EAGAIN;
1da177e4 2759 case -NFS4ERR_DELAY:
2e96d286 2760 nfs_inc_server_stats(server, NFSIOS_DELAY);
006ea73e 2761 case -NFS4ERR_GRACE:
1da177e4
LT		 2762 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2763 task->tk_status = 0;
2764 return -EAGAIN;
2765 case -NFS4ERR_OLD_STATEID:
2766 task->tk_status = 0;
2767 return -EAGAIN;
2768 }
2769 task->tk_status = nfs4_map_errors(task->tk_status);
2770 return 0;
2771}
2772
150030b7 2773static int nfs4_wait_bit_killable(void *word)
433fbe4c 2774{
150030b7 2775 if (fatal_signal_pending(current))
433fbe4c
TM		 2776 return -ERESTARTSYS;
2777 schedule();
2778 return 0;
2779}
2780
adfa6f98 2781static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2782{
433fbe4c 2783 int res;
1da177e4
LT		 2784
2785 might_sleep();
2786
e148582e
TM		 2787 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2788
433fbe4c 2789 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
150030b7 2790 nfs4_wait_bit_killable, TASK_KILLABLE);
e148582e
TM		 2791
2792 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2793 return res;
2794}
2795
2796static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2797{
1da177e4
LT		 2798 int res = 0;
2799
2800 might_sleep();
2801
2802 if (*timeout <= 0)
2803 *timeout = NFS4_POLL_RETRY_MIN;
2804 if (*timeout > NFS4_POLL_RETRY_MAX)
2805 *timeout = NFS4_POLL_RETRY_MAX;
150030b7
MW		 2806 schedule_timeout_killable(*timeout);
2807 if (fatal_signal_pending(current))
2808 res = -ERESTARTSYS;
1da177e4
LT		 2809 *timeout <<= 1;
2810 return res;
2811}
2812
2813/* This is the error handling routine for processes that are allowed
2814 * to sleep.
2815 */
10afec90 2816static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2817{
7539bbab 2818 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2819 int ret = errorcode;
2820
2821 exception->retry = 0;
2822 switch(errorcode) {
2823 case 0:
2824 return 0;
2825 case -NFS4ERR_STALE_CLIENTID:
2826 case -NFS4ERR_STALE_STATEID:
2827 case -NFS4ERR_EXPIRED:
433fbe4c 2828 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2829 ret = nfs4_wait_clnt_recover(server->client, clp);
2830 if (ret == 0)
2831 exception->retry = 1;
2832 break;
c514983d 2833 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2834 case -NFS4ERR_GRACE:
2835 case -NFS4ERR_DELAY:
2836 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2837 if (ret != 0)
2838 break;
1da177e4 2839 case -NFS4ERR_OLD_STATEID:
2c56617d 2840 exception->retry = 1;
1da177e4
LT		 2841 }
2842 /* We failed to handle the error */
2843 return nfs4_map_errors(ret);
2844}
2845
adfa6f98 2846int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2847{
2848 nfs4_verifier sc_verifier;
2849 struct nfs4_setclientid setclientid = {
2850 .sc_verifier = &sc_verifier,
2851 .sc_prog = program,
2852 };
2853 struct rpc_message msg = {
2854 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2855 .rpc_argp = &setclientid,
2856 .rpc_resp = clp,
286d7d6a 2857 .rpc_cred = cred,
1da177e4 2858 };
bc4785cd 2859 __be32 *p;
1da177e4
LT		 2860 int loop = 0;
2861 int status;
2862
bc4785cd 2863 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2864 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2865 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2866
2867 for(;;) {
2868 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
69dd716c 2869 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
d4d3c507
CL		 2870 clp->cl_ipaddr,
2871 rpc_peeraddr2str(clp->cl_rpcclient,
2872 RPC_DISPLAY_ADDR),
69dd716c
TM		 2873 rpc_peeraddr2str(clp->cl_rpcclient,
2874 RPC_DISPLAY_PROTO),
78ea323b 2875 clp->cl_rpcclient->cl_auth->au_ops->au_name,
1da177e4
LT		 2876 clp->cl_id_uniquifier);
2877 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
d4d3c507
CL		 2878 sizeof(setclientid.sc_netid),
2879 rpc_peeraddr2str(clp->cl_rpcclient,
2880 RPC_DISPLAY_NETID));
1da177e4 2881 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
d4d3c507 2882 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
1da177e4
LT		 2883 clp->cl_ipaddr, port >> 8, port & 255);
2884
2885 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2886 if (status != -NFS4ERR_CLID_INUSE)
2887 break;
2888 if (signalled())
2889 break;
2890 if (loop++ & 1)
2891 ssleep(clp->cl_lease_time + 1);
2892 else
2893 if (++clp->cl_id_uniquifier == 0)
2894 break;
2895 }
2896 return status;
2897}
2898
adfa6f98 2899static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2900{
2901 struct nfs_fsinfo fsinfo;
2902 struct rpc_message msg = {
2903 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2904 .rpc_argp = clp,
2905 .rpc_resp = &fsinfo,
286d7d6a 2906 .rpc_cred = cred,
1da177e4
LT		 2907 };
2908 unsigned long now;
2909 int status;
2910
2911 now = jiffies;
2912 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2913 if (status == 0) {
2914 spin_lock(&clp->cl_lock);
2915 clp->cl_lease_time = fsinfo.lease_time * HZ;
2916 clp->cl_last_renewal = now;
58d9714a 2917 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2918 spin_unlock(&clp->cl_lock);
2919 }
2920 return status;
2921}
2922
adfa6f98 2923int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b 2924{
77e03677 2925 long timeout = 0;
51581f3b
TM		 2926 int err;
2927 do {
2928 err = _nfs4_proc_setclientid_confirm(clp, cred);
2929 switch (err) {
2930 case 0:
2931 return err;
2932 case -NFS4ERR_RESOURCE:
2933 /* The IBM lawyers misread another document! */
2934 case -NFS4ERR_DELAY:
2935 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2936 }
2937 } while (err == 0);
2938 return err;
2939}
2940
fe650407
TM		 2941struct nfs4_delegreturndata {
2942 struct nfs4_delegreturnargs args;
fa178f29 2943 struct nfs4_delegreturnres res;
fe650407
TM		 2944 struct nfs_fh fh;
2945 nfs4_stateid stateid;
26e976a8 2946 unsigned long timestamp;
fa178f29 2947 struct nfs_fattr fattr;
fe650407
TM		 2948 int rpc_status;
2949};
2950
fe650407
TM		 2951static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2952{
2953 struct nfs4_delegreturndata *data = calldata;
2954 data->rpc_status = task->tk_status;
26e976a8 2955 if (data->rpc_status == 0)
fa178f29 2956 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2957}
2958
2959static void nfs4_delegreturn_release(void *calldata)
2960{
fe650407
TM		 2961 kfree(calldata);
2962}
2963
c8d149f3 2964static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 2965 .rpc_call_done = nfs4_delegreturn_done,
2966 .rpc_release = nfs4_delegreturn_release,
2967};
2968
e6f81075 2969static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
fe650407
TM		 2970{
2971 struct nfs4_delegreturndata *data;
fa178f29 2972 struct nfs_server *server = NFS_SERVER(inode);
fe650407 2973 struct rpc_task *task;
5138fde0
TM		 2974 struct rpc_message msg = {
2975 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2976 .rpc_cred = cred,
2977 };
c970aa85
TM		 2978 struct rpc_task_setup task_setup_data = {
2979 .rpc_client = server->client,
5138fde0 2980 .rpc_message = &msg,
c970aa85
TM		 2981 .callback_ops = &nfs4_delegreturn_ops,
2982 .flags = RPC_TASK_ASYNC,
2983 };
e6f81075 2984 int status = 0;
fe650407
TM		 2985
2986 data = kmalloc(sizeof(*data), GFP_KERNEL);
2987 if (data == NULL)
2988 return -ENOMEM;
2989 data->args.fhandle = &data->fh;
2990 data->args.stateid = &data->stateid;
fa178f29 2991 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 2992 nfs_copy_fh(&data->fh, NFS_FH(inode));
2993 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 2994 data->res.fattr = &data->fattr;
2995 data->res.server = server;
5138fde0 2996 nfs_fattr_init(data->res.fattr);
26e976a8 2997 data->timestamp = jiffies;
fe650407
TM		 2998 data->rpc_status = 0;
2999
c970aa85 3000 task_setup_data.callback_data = data;
5138fde0
TM		 3001 msg.rpc_argp = &data->args,
3002 msg.rpc_resp = &data->res,
c970aa85 3003 task = rpc_run_task(&task_setup_data);
7a1218a2 3004 if (IS_ERR(task))
fe650407 3005 return PTR_ERR(task);
e6f81075
TM		 3006 if (!issync)
3007 goto out;
fe650407 3008 status = nfs4_wait_for_completion_rpc_task(task);
e6f81075
TM		 3009 if (status != 0)
3010 goto out;
3011 status = data->rpc_status;
3012 if (status != 0)
3013 goto out;
3014 nfs_refresh_inode(inode, &data->fattr);
3015out:
e6b3c4db 3016 rpc_put_task(task);
fe650407 3017 return status;
1da177e4
LT		 3018}
3019
e6f81075 3020int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
1da177e4
LT		 3021{
3022 struct nfs_server *server = NFS_SERVER(inode);
3023 struct nfs4_exception exception = { };
3024 int err;
3025 do {
e6f81075 3026 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
1da177e4
LT		 3027 switch (err) {
3028 case -NFS4ERR_STALE_STATEID:
3029 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3030 case 0:
3031 return 0;
3032 }
3033 err = nfs4_handle_exception(server, err, &exception);
3034 } while (exception.retry);
3035 return err;
3036}
3037
3038#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3039#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3040
3041/*
3042 * sleep, with exponential backoff, and retry the LOCK operation.
3043 */
3044static unsigned long
3045nfs4_set_lock_task_retry(unsigned long timeout)
3046{
150030b7 3047 schedule_timeout_killable(timeout);
1da177e4
LT		 3048 timeout <<= 1;
3049 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3050 return NFS4_LOCK_MAXTIMEOUT;
3051 return timeout;
3052}
3053
1da177e4
LT		 3054static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3055{
3056 struct inode *inode = state->inode;
3057 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3058 struct nfs_client *clp = server->nfs_client;
911d1aaf 3059 struct nfs_lockt_args arg = {
1da177e4 3060 .fh = NFS_FH(inode),
911d1aaf 3061 .fl = request,
1da177e4 3062 };
911d1aaf
TM		 3063 struct nfs_lockt_res res = {
3064 .denied = request,
1da177e4
LT		 3065 };
3066 struct rpc_message msg = {
3067 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3068 .rpc_argp = &arg,
3069 .rpc_resp = &res,
3070 .rpc_cred = state->owner->so_cred,
3071 };
1da177e4
LT		 3072 struct nfs4_lock_state *lsp;
3073 int status;
3074
3075 down_read(&clp->cl_sem);
911d1aaf 3076 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3077 status = nfs4_set_lock_state(state, request);
3078 if (status != 0)
3079 goto out;
3080 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3081 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3082 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3083 switch (status) {
3084 case 0:
3085 request->fl_type = F_UNLCK;
3086 break;
3087 case -NFS4ERR_DENIED:
3088 status = 0;
1da177e4 3089 }
70cc6487 3090 request->fl_ops->fl_release_private(request);
8d0a8a9d 3091out:
1da177e4
LT		 3092 up_read(&clp->cl_sem);
3093 return status;
3094}
3095
3096static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3097{
3098 struct nfs4_exception exception = { };
3099 int err;
3100
3101 do {
3102 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3103 _nfs4_proc_getlk(state, cmd, request),
3104 &exception);
3105 } while (exception.retry);
3106 return err;
3107}
3108
3109static int do_vfs_lock(struct file *file, struct file_lock *fl)
3110{
3111 int res = 0;
3112 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3113 case FL_POSIX:
3114 res = posix_lock_file_wait(file, fl);
3115 break;
3116 case FL_FLOCK:
3117 res = flock_lock_file_wait(file, fl);
3118 break;
3119 default:
3120 BUG();
3121 }
1da177e4
LT		 3122 return res;
3123}
3124
faf5f49c 3125struct nfs4_unlockdata {
911d1aaf
TM		 3126 struct nfs_locku_args arg;
3127 struct nfs_locku_res res;
faf5f49c
TM		 3128 struct nfs4_lock_state *lsp;
3129 struct nfs_open_context *ctx;
911d1aaf
TM		 3130 struct file_lock fl;
3131 const struct nfs_server *server;
26e976a8 3132 unsigned long timestamp;
faf5f49c
TM		 3133};
3134
911d1aaf
TM		 3135static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3136 struct nfs_open_context *ctx,
3137 struct nfs4_lock_state *lsp,
3138 struct nfs_seqid *seqid)
3139{
3140 struct nfs4_unlockdata *p;
3141 struct inode *inode = lsp->ls_state->inode;
3142
3143 p = kmalloc(sizeof(*p), GFP_KERNEL);
3144 if (p == NULL)
3145 return NULL;
3146 p->arg.fh = NFS_FH(inode);
3147 p->arg.fl = &p->fl;
3148 p->arg.seqid = seqid;
c1d51931 3149 p->res.seqid = seqid;
911d1aaf
TM		 3150 p->arg.stateid = &lsp->ls_stateid;
3151 p->lsp = lsp;
3152 atomic_inc(&lsp->ls_count);
3153 /* Ensure we don't close file until we're done freeing locks! */
3154 p->ctx = get_nfs_open_context(ctx);
3155 memcpy(&p->fl, fl, sizeof(p->fl));
3156 p->server = NFS_SERVER(inode);
3157 return p;
3158}
3159
06f814a3 3160static void nfs4_locku_release_calldata(void *data)
faf5f49c 3161{
963d8fe5 3162 struct nfs4_unlockdata *calldata = data;
911d1aaf 3163 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3164 nfs4_put_lock_state(calldata->lsp);
3165 put_nfs_open_context(calldata->ctx);
3166 kfree(calldata);
faf5f49c
TM		 3167}
3168
963d8fe5 3169static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3170{
963d8fe5 3171 struct nfs4_unlockdata *calldata = data;
faf5f49c 3172
06f814a3
TM		 3173 if (RPC_ASSASSINATED(task))
3174 return;
faf5f49c
TM		 3175 switch (task->tk_status) {
3176 case 0:
3177 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3178 calldata->res.stateid.data,
faf5f49c 3179 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3180 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3181 break;
3182 case -NFS4ERR_STALE_STATEID:
3183 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3184 break;
3185 default:
a6a352e9 3186 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3187 rpc_restart_call(task);
faf5f49c 3188 }
faf5f49c
TM		 3189}
3190
4ce70ada 3191static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3192{
4ce70ada 3193 struct nfs4_unlockdata *calldata = data;
faf5f49c 3194
911d1aaf 3195 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3196 return;
3197 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3198 /* Note: exit _without_ running nfs4_locku_done */
3199 task->tk_action = NULL;
faf5f49c
TM		 3200 return;
3201 }
26e976a8 3202 calldata->timestamp = jiffies;
5138fde0 3203 rpc_call_start(task);
faf5f49c
TM		 3204}
3205
963d8fe5 3206static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3207 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3208 .rpc_call_done = nfs4_locku_done,
06f814a3 3209 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3210};
3211
a5d16a4d
TM		 3212static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3213 struct nfs_open_context *ctx,
3214 struct nfs4_lock_state *lsp,
3215 struct nfs_seqid *seqid)
3216{
3217 struct nfs4_unlockdata *data;
5138fde0
TM		 3218 struct rpc_message msg = {
3219 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3220 .rpc_cred = ctx->cred,
3221 };
c970aa85
TM		 3222 struct rpc_task_setup task_setup_data = {
3223 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5138fde0 3224 .rpc_message = &msg,
c970aa85 3225 .callback_ops = &nfs4_locku_ops,
101070ca 3226 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3227 .flags = RPC_TASK_ASYNC,
3228 };
a5d16a4d 3229
137d6aca
FF		 3230 /* Ensure this is an unlock - when canceling a lock, the
3231 * canceled lock is passed in, and it won't be an unlock.
3232 */
3233 fl->fl_type = F_UNLCK;
3234
a5d16a4d
TM		 3235 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3236 if (data == NULL) {
3237 nfs_free_seqid(seqid);
3238 return ERR_PTR(-ENOMEM);
3239 }
3240
5138fde0
TM		 3241 msg.rpc_argp = &data->arg,
3242 msg.rpc_resp = &data->res,
c970aa85
TM		 3243 task_setup_data.callback_data = data;
3244 return rpc_run_task(&task_setup_data);
a5d16a4d
TM		 3245}
3246
faf5f49c
TM		 3247static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3248{
911d1aaf 3249 struct nfs_seqid *seqid;
1da177e4 3250 struct nfs4_lock_state *lsp;
06f814a3
TM		 3251 struct rpc_task *task;
3252 int status = 0;
536ff0f8 3253 unsigned char fl_flags = request->fl_flags;
faf5f49c 3254
8d0a8a9d 3255 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3256 /* Unlock _before_ we do the RPC call */
3257 request->fl_flags |= FL_EXISTS;
3258 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3259 goto out;
8d0a8a9d 3260 if (status != 0)
9b073574
TM		 3261 goto out;
3262 /* Is this a delegated lock? */
3263 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3264 goto out;
8d0a8a9d 3265 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3266 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3267 status = -ENOMEM;
911d1aaf 3268 if (seqid == NULL)
9b073574 3269 goto out;
cd3758e3 3270 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3271 status = PTR_ERR(task);
3272 if (IS_ERR(task))
9b073574 3273 goto out;
a5d16a4d 3274 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3275 rpc_put_task(task);
9b073574 3276out:
536ff0f8 3277 request->fl_flags = fl_flags;
1da177e4
LT		 3278 return status;
3279}
3280
a5d16a4d
TM		 3281struct nfs4_lockdata {
3282 struct nfs_lock_args arg;
3283 struct nfs_lock_res res;
3284 struct nfs4_lock_state *lsp;
3285 struct nfs_open_context *ctx;
3286 struct file_lock fl;
26e976a8 3287 unsigned long timestamp;
a5d16a4d
TM		 3288 int rpc_status;
3289 int cancelled;
3290};
3291
3292static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3293 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3294{
a5d16a4d
TM		 3295 struct nfs4_lockdata *p;
3296 struct inode *inode = lsp->ls_state->inode;
1da177e4 3297 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3298
3299 p = kzalloc(sizeof(*p), GFP_KERNEL);
3300 if (p == NULL)
3301 return NULL;
3302
3303 p->arg.fh = NFS_FH(inode);
3304 p->arg.fl = &p->fl;
2f74c0a0
TM		 3305 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3306 if (p->arg.open_seqid == NULL)
3307 goto out_free;
a5d16a4d
TM		 3308 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3309 if (p->arg.lock_seqid == NULL)
2f74c0a0 3310 goto out_free_seqid;
a5d16a4d 3311 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3312 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3313 p->arg.lock_owner.id = lsp->ls_id.id;
c1d51931 3314 p->res.lock_seqid = p->arg.lock_seqid;
a5d16a4d
TM		 3315 p->lsp = lsp;
3316 atomic_inc(&lsp->ls_count);
3317 p->ctx = get_nfs_open_context(ctx);
3318 memcpy(&p->fl, fl, sizeof(p->fl));
3319 return p;
2f74c0a0
TM		 3320out_free_seqid:
3321 nfs_free_seqid(p->arg.open_seqid);
a5d16a4d
TM		 3322out_free:
3323 kfree(p);
3324 return NULL;
3325}
3326
3327static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3328{
3329 struct nfs4_lockdata *data = calldata;
3330 struct nfs4_state *state = data->lsp->ls_state;
06735b34 3331
3110ff80 3332 dprintk("%s: begin!\n", __func__);
2f74c0a0
TM		 3333 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3334 return;
a5d16a4d
TM		 3335 /* Do we need to do an open_to_lock_owner? */
3336 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
e6e21970
TM		 3337 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3338 return;
a5d16a4d
TM		 3339 data->arg.open_stateid = &state->stateid;
3340 data->arg.new_lock_owner = 1;
c1d51931 3341 data->res.open_seqid = data->arg.open_seqid;
2f74c0a0
TM		 3342 } else
3343 data->arg.new_lock_owner = 0;
26e976a8 3344 data->timestamp = jiffies;
5138fde0 3345 rpc_call_start(task);
3110ff80 3346 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
a5d16a4d
TM		 3347}
3348
3349static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3350{
3351 struct nfs4_lockdata *data = calldata;
3352
3110ff80 3353 dprintk("%s: begin!\n", __func__);
a5d16a4d
TM		 3354
3355 data->rpc_status = task->tk_status;
3356 if (RPC_ASSASSINATED(task))
3357 goto out;
3358 if (data->arg.new_lock_owner != 0) {
a5d16a4d
TM		 3359 if (data->rpc_status == 0)
3360 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3361 else
3362 goto out;
3363 }
3364 if (data->rpc_status == 0) {
3365 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3366 sizeof(data->lsp->ls_stateid.data));
3367 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3368 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d 3369 }
a5d16a4d 3370out:
3110ff80 3371 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
a5d16a4d
TM		 3372}
3373
3374static void nfs4_lock_release(void *calldata)
3375{
3376 struct nfs4_lockdata *data = calldata;
3377
3110ff80 3378 dprintk("%s: begin!\n", __func__);
2f74c0a0 3379 nfs_free_seqid(data->arg.open_seqid);
a5d16a4d
TM		 3380 if (data->cancelled != 0) {
3381 struct rpc_task *task;
3382 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3383 data->arg.lock_seqid);
3384 if (!IS_ERR(task))
e6b3c4db 3385 rpc_put_task(task);
3110ff80 3386 dprintk("%s: cancelling lock!\n", __func__);
a5d16a4d
TM		 3387 } else
3388 nfs_free_seqid(data->arg.lock_seqid);
3389 nfs4_put_lock_state(data->lsp);
3390 put_nfs_open_context(data->ctx);
3391 kfree(data);
3110ff80 3392 dprintk("%s: done!\n", __func__);
a5d16a4d
TM		 3393}
3394
3395static const struct rpc_call_ops nfs4_lock_ops = {
3396 .rpc_call_prepare = nfs4_lock_prepare,
3397 .rpc_call_done = nfs4_lock_done,
3398 .rpc_release = nfs4_lock_release,
3399};
3400
3401static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3402{
3403 struct nfs4_lockdata *data;
3404 struct rpc_task *task;
5138fde0
TM		 3405 struct rpc_message msg = {
3406 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3407 .rpc_cred = state->owner->so_cred,
3408 };
c970aa85
TM		 3409 struct rpc_task_setup task_setup_data = {
3410 .rpc_client = NFS_CLIENT(state->inode),
5138fde0 3411 .rpc_message = &msg,
c970aa85 3412 .callback_ops = &nfs4_lock_ops,
101070ca 3413 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3414 .flags = RPC_TASK_ASYNC,
3415 };
a5d16a4d
TM		 3416 int ret;
3417
3110ff80 3418 dprintk("%s: begin!\n", __func__);
cd3758e3 3419 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3420 fl->fl_u.nfs4_fl.owner);
3421 if (data == NULL)
3422 return -ENOMEM;
3423 if (IS_SETLKW(cmd))
3424 data->arg.block = 1;
3425 if (reclaim != 0)
3426 data->arg.reclaim = 1;
5138fde0
TM		 3427 msg.rpc_argp = &data->arg,
3428 msg.rpc_resp = &data->res,
c970aa85
TM		 3429 task_setup_data.callback_data = data;
3430 task = rpc_run_task(&task_setup_data);
7a1218a2 3431 if (IS_ERR(task))
a5d16a4d 3432 return PTR_ERR(task);
a5d16a4d
TM		 3433 ret = nfs4_wait_for_completion_rpc_task(task);
3434 if (ret == 0) {
3435 ret = data->rpc_status;
3436 if (ret == -NFS4ERR_DENIED)
3437 ret = -EAGAIN;
3438 } else
3439 data->cancelled = 1;
e6b3c4db 3440 rpc_put_task(task);
3110ff80 3441 dprintk("%s: done, ret = %d!\n", __func__, ret);
a5d16a4d 3442 return ret;
1da177e4
LT		 3443}
3444
3445static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3446{
202b50dc
TM		 3447 struct nfs_server *server = NFS_SERVER(state->inode);
3448 struct nfs4_exception exception = { };
3449 int err;
3450
3451 do {
42a2d13e
TM		 3452 /* Cache the lock if possible... */
3453 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3454 return 0;
202b50dc
TM		 3455 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3456 if (err != -NFS4ERR_DELAY)
3457 break;
3458 nfs4_handle_exception(server, err, &exception);
3459 } while (exception.retry);
3460 return err;
1da177e4
LT		 3461}
3462
3463static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3464{
202b50dc
TM		 3465 struct nfs_server *server = NFS_SERVER(state->inode);
3466 struct nfs4_exception exception = { };
3467 int err;
3468
6bfc93ef
TM		 3469 err = nfs4_set_lock_state(state, request);
3470 if (err != 0)
3471 return err;
202b50dc 3472 do {
42a2d13e
TM		 3473 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3474 return 0;
202b50dc
TM		 3475 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3476 if (err != -NFS4ERR_DELAY)
3477 break;
3478 nfs4_handle_exception(server, err, &exception);
3479 } while (exception.retry);
3480 return err;
1da177e4
LT		 3481}
3482
3483static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3484{
adfa6f98 3485 struct nfs_client *clp = state->owner->so_client;
01c3b861 3486 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3487 int status;
3488
6bfc93ef 3489 /* Is this a delegated open? */
6bfc93ef
TM		 3490 status = nfs4_set_lock_state(state, request);
3491 if (status != 0)
3492 goto out;
01c3b861
TM		 3493 request->fl_flags |= FL_ACCESS;
3494 status = do_vfs_lock(request->fl_file, request);
3495 if (status < 0)
3496 goto out;
3497 down_read(&clp->cl_sem);
3498 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3499 struct nfs_inode *nfsi = NFS_I(state->inode);
3500 /* Yes: cache locks! */
3501 down_read(&nfsi->rwsem);
3502 /* ...but avoid races with delegation recall... */
3503 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3504 request->fl_flags = fl_flags & ~FL_SLEEP;
3505 status = do_vfs_lock(request->fl_file, request);
3506 up_read(&nfsi->rwsem);
3507 goto out_unlock;
3508 }
3509 up_read(&nfsi->rwsem);
3510 }
6bfc93ef
TM		 3511 status = _nfs4_do_setlk(state, cmd, request, 0);
3512 if (status != 0)
01c3b861 3513 goto out_unlock;
6bfc93ef 3514 /* Note: we always want to sleep here! */
01c3b861 3515 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef 3516 if (do_vfs_lock(request->fl_file, request) < 0)
3110ff80 3517 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
01c3b861 3518out_unlock:
1da177e4 3519 up_read(&clp->cl_sem);
01c3b861
TM		 3520out:
3521 request->fl_flags = fl_flags;
1da177e4
LT		 3522 return status;
3523}
3524
3525static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3526{
3527 struct nfs4_exception exception = { };
3528 int err;
3529
3530 do {
3531 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3532 _nfs4_proc_setlk(state, cmd, request),
3533 &exception);
3534 } while (exception.retry);
3535 return err;
3536}
3537
3538static int
3539nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3540{
3541 struct nfs_open_context *ctx;
3542 struct nfs4_state *state;
3543 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3544 int status;
3545
3546 /* verify open state */
cd3758e3 3547 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3548 state = ctx->state;
3549
3550 if (request->fl_start < 0 || request->fl_end < 0)
3551 return -EINVAL;
3552
3553 if (IS_GETLK(cmd))
3554 return nfs4_proc_getlk(state, F_GETLK, request);
3555
3556 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3557 return -EINVAL;
3558
3559 if (request->fl_type == F_UNLCK)
3560 return nfs4_proc_unlck(state, cmd, request);
3561
3562 do {
3563 status = nfs4_proc_setlk(state, cmd, request);
3564 if ((status != -EAGAIN) || IS_SETLK(cmd))
3565 break;
3566 timeout = nfs4_set_lock_task_retry(timeout);
3567 status = -ERESTARTSYS;
3568 if (signalled())
3569 break;
3570 } while(status < 0);
1da177e4
LT		 3571 return status;
3572}
3573
888e694c
TM		 3574int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3575{
3576 struct nfs_server *server = NFS_SERVER(state->inode);
3577 struct nfs4_exception exception = { };
3578 int err;
3579
3580 err = nfs4_set_lock_state(state, fl);
3581 if (err != 0)
3582 goto out;
3583 do {
3584 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3585 if (err != -NFS4ERR_DELAY)
3586 break;
3587 err = nfs4_handle_exception(server, err, &exception);
3588 } while (exception.retry);
3589out:
3590 return err;
3591}
6b3b5496 3592
aa1870af
BF		 3593#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3594
6b3b5496
BF		 3595int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3596 size_t buflen, int flags)
3597{
4b580ee3
BF		 3598 struct inode *inode = dentry->d_inode;
3599
3600 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3601 return -EOPNOTSUPP;
3602
4b580ee3 3603 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3604}
3605
3606/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3607 * and that's what we'll do for e.g. user attributes that haven't been set.
3608 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3609 * attributes in kernel-managed attribute namespaces. */
3610ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3611 size_t buflen)
3612{
aa1870af
BF		 3613 struct inode *inode = dentry->d_inode;
3614
3615 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3616 return -EOPNOTSUPP;
3617
3618 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3619}
3620
3621ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3622{
aa1870af 3623 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3624
096455a2
BF		 3625 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3626 return 0;
6b3b5496
BF		 3627 if (buf && buflen < len)
3628 return -ERANGE;
3629 if (buf)
aa1870af
BF		 3630 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3631 return len;
6b3b5496
BF		 3632}
3633
56659e99 3634int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3635 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3636{
3637 struct nfs_server *server = NFS_SERVER(dir);
3638 u32 bitmask[2] = {
361e624f
MN		 3639 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3640 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3641 };
3642 struct nfs4_fs_locations_arg args = {
3643 .dir_fh = NFS_FH(dir),
c228fd3a 3644 .name = name,
683b57b4
TM		 3645 .page = page,
3646 .bitmask = bitmask,
3647 };
3648 struct rpc_message msg = {
3649 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3650 .rpc_argp = &args,
7aaa0b3b 3651 .rpc_resp = fs_locations,
683b57b4
TM		 3652 };
3653 int status;
3654
3110ff80 3655 dprintk("%s: start\n", __func__);
c228fd3a 3656 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3657 fs_locations->server = server;
830b8e33 3658 fs_locations->nlocations = 0;
683b57b4 3659 status = rpc_call_sync(server->client, &msg, 0);
3110ff80 3660 dprintk("%s: returned status = %d\n", __func__, status);
683b57b4
TM		 3661 return status;
3662}
3663
1da177e4
LT		 3664struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3665 .recover_open = nfs4_open_reclaim,
3666 .recover_lock = nfs4_lock_reclaim,
3667};
3668
3669struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3670 .recover_open = nfs4_open_expired,
3671 .recover_lock = nfs4_lock_expired,
3672};
3673
92e1d5be 3674static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3675 .permission = nfs_permission,
3676 .getattr = nfs_getattr,
3677 .setattr = nfs_setattr,
3678 .getxattr = nfs4_getxattr,
3679 .setxattr = nfs4_setxattr,
3680 .listxattr = nfs4_listxattr,
3681};
3682
509de811 3683const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3684 .version = 4, /* protocol version */
3685 .dentry_ops = &nfs4_dentry_operations,
3686 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3687 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3688 .getroot = nfs4_proc_get_root,
3689 .getattr = nfs4_proc_getattr,
3690 .setattr = nfs4_proc_setattr,
2b3de441 3691 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3692 .lookup = nfs4_proc_lookup,
3693 .access = nfs4_proc_access,
3694 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3695 .create = nfs4_proc_create,
3696 .remove = nfs4_proc_remove,
3697 .unlink_setup = nfs4_proc_unlink_setup,
3698 .unlink_done = nfs4_proc_unlink_done,
3699 .rename = nfs4_proc_rename,
3700 .link = nfs4_proc_link,
3701 .symlink = nfs4_proc_symlink,
3702 .mkdir = nfs4_proc_mkdir,
3703 .rmdir = nfs4_proc_remove,
3704 .readdir = nfs4_proc_readdir,
3705 .mknod = nfs4_proc_mknod,
3706 .statfs = nfs4_proc_statfs,
3707 .fsinfo = nfs4_proc_fsinfo,
3708 .pathconf = nfs4_proc_pathconf,
e9326dca 3709 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3710 .decode_dirent = nfs4_decode_dirent,
3711 .read_setup = nfs4_proc_read_setup,
ec06c096 3712 .read_done = nfs4_read_done,
1da177e4 3713 .write_setup = nfs4_proc_write_setup,
788e7a89 3714 .write_done = nfs4_write_done,
1da177e4 3715 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3716 .commit_done = nfs4_commit_done,
1da177e4 3717 .lock = nfs4_proc_lock,
e50a1c2e 3718 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3719};
3720
3721/*
3722 * Local variables:
3723 * c-basic-offset: 8
3724 * End:
3725 */
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