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NLM: allow lockd requests from an unprivileged port
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
101070ca 54#include "internal.h"
006ea73e 55#include "iostat.h"
1da177e4
LT		 56
57#define NFSDBG_FACILITY NFSDBG_PROC
58
2066fe89 59#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 60#define NFS4_POLL_RETRY_MAX (15*HZ)
61
cdd4e68b 62struct nfs4_opendata;
864472e9 63static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 64static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 65static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
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);
504e5189
NB		 1662 if (ctx) {
1663 cred = ctx->cred;
1664 state = ctx->state;
1665 }
659bfcd6 1666 }
08e9eac4 1667
659bfcd6 1668 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
65e4308d
TM		 1669 if (status == 0)
1670 nfs_setattr_update_inode(inode, sattr);
1da177e4
LT		 1671 return status;
1672}
1673
56659e99
TM		 1674static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1675 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1676 struct nfs_fattr *fattr)
1677{
1678 int status;
1679 struct nfs4_lookup_arg args = {
1680 .bitmask = server->attr_bitmask,
1681 .dir_fh = dirfh,
1682 .name = name,
1683 };
1684 struct nfs4_lookup_res res = {
1685 .server = server,
1686 .fattr = fattr,
1687 .fh = fhandle,
1688 };
1689 struct rpc_message msg = {
1690 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1691 .rpc_argp = &args,
1692 .rpc_resp = &res,
1693 };
1694
1695 nfs_fattr_init(fattr);
1696
1697 dprintk("NFS call lookupfh %s\n", name->name);
1698 status = rpc_call_sync(server->client, &msg, 0);
1699 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1700 return status;
1701}
1702
1703static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1704 struct qstr *name, struct nfs_fh *fhandle,
1705 struct nfs_fattr *fattr)
1706{
1707 struct nfs4_exception exception = { };
1708 int err;
1709 do {
4e56e082
TM		 1710 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1711 /* FIXME: !!!! */
1712 if (err == -NFS4ERR_MOVED) {
1713 err = -EREMOTE;
1714 break;
1715 }
1716 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1717 } while (exception.retry);
1718 return err;
1719}
1720
56659e99 1721static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1722 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1723{
4e56e082 1724 int status;
1da177e4
LT		 1725
1726 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1727 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1728 if (status == -NFS4ERR_MOVED)
1729 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1730 dprintk("NFS reply lookup: %d\n", status);
1731 return status;
1732}
1733
1734static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1735{
1736 struct nfs4_exception exception = { };
1737 int err;
1738 do {
1739 err = nfs4_handle_exception(NFS_SERVER(dir),
1740 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1741 &exception);
1742 } while (exception.retry);
1743 return err;
1744}
1745
1746static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1747{
76b32999
TM		 1748 struct nfs_server *server = NFS_SERVER(inode);
1749 struct nfs_fattr fattr;
1da177e4
LT		 1750 struct nfs4_accessargs args = {
1751 .fh = NFS_FH(inode),
76b32999
TM		 1752 .bitmask = server->attr_bitmask,
1753 };
1754 struct nfs4_accessres res = {
1755 .server = server,
1756 .fattr = &fattr,
1da177e4 1757 };
1da177e4
LT		 1758 struct rpc_message msg = {
1759 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1760 .rpc_argp = &args,
1761 .rpc_resp = &res,
1762 .rpc_cred = entry->cred,
1763 };
1764 int mode = entry->mask;
1765 int status;
1766
1767 /*
1768 * Determine which access bits we want to ask for...
1769 */
1770 if (mode & MAY_READ)
1771 args.access |= NFS4_ACCESS_READ;
1772 if (S_ISDIR(inode->i_mode)) {
1773 if (mode & MAY_WRITE)
1774 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1775 if (mode & MAY_EXEC)
1776 args.access |= NFS4_ACCESS_LOOKUP;
1777 } else {
1778 if (mode & MAY_WRITE)
1779 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1780 if (mode & MAY_EXEC)
1781 args.access |= NFS4_ACCESS_EXECUTE;
1782 }
76b32999 1783 nfs_fattr_init(&fattr);
1da177e4
LT		 1784 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1785 if (!status) {
1786 entry->mask = 0;
1787 if (res.access & NFS4_ACCESS_READ)
1788 entry->mask |= MAY_READ;
1789 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1790 entry->mask |= MAY_WRITE;
1791 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1792 entry->mask |= MAY_EXEC;
76b32999 1793 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1794 }
1795 return status;
1796}
1797
1798static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1799{
1800 struct nfs4_exception exception = { };
1801 int err;
1802 do {
1803 err = nfs4_handle_exception(NFS_SERVER(inode),
1804 _nfs4_proc_access(inode, entry),
1805 &exception);
1806 } while (exception.retry);
1807 return err;
1808}
1809
1810/*
1811 * TODO: For the time being, we don't try to get any attributes
1812 * along with any of the zero-copy operations READ, READDIR,
1813 * READLINK, WRITE.
1814 *
1815 * In the case of the first three, we want to put the GETATTR
1816 * after the read-type operation -- this is because it is hard
1817 * to predict the length of a GETATTR response in v4, and thus
1818 * align the READ data correctly. This means that the GETATTR
1819 * may end up partially falling into the page cache, and we should
1820 * shift it into the 'tail' of the xdr_buf before processing.
1821 * To do this efficiently, we need to know the total length
1822 * of data received, which doesn't seem to be available outside
1823 * of the RPC layer.
1824 *
1825 * In the case of WRITE, we also want to put the GETATTR after
1826 * the operation -- in this case because we want to make sure
1827 * we get the post-operation mtime and size. This means that
1828 * we can't use xdr_encode_pages() as written: we need a variant
1829 * of it which would leave room in the 'tail' iovec.
1830 *
1831 * Both of these changes to the XDR layer would in fact be quite
1832 * minor, but I decided to leave them for a subsequent patch.
1833 */
1834static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1835 unsigned int pgbase, unsigned int pglen)
1836{
1837 struct nfs4_readlink args = {
1838 .fh = NFS_FH(inode),
1839 .pgbase = pgbase,
1840 .pglen = pglen,
1841 .pages = &page,
1842 };
1843 struct rpc_message msg = {
1844 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1845 .rpc_argp = &args,
1846 .rpc_resp = NULL,
1847 };
1848
1849 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1850}
1851
1852static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1853 unsigned int pgbase, unsigned int pglen)
1854{
1855 struct nfs4_exception exception = { };
1856 int err;
1857 do {
1858 err = nfs4_handle_exception(NFS_SERVER(inode),
1859 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1860 &exception);
1861 } while (exception.retry);
1862 return err;
1863}
1864
1da177e4
LT		 1865/*
1866 * Got race?
1867 * We will need to arrange for the VFS layer to provide an atomic open.
1868 * Until then, this create/open method is prone to inefficiency and race
1869 * conditions due to the lookup, create, and open VFS calls from sys_open()
1870 * placed on the wire.
1871 *
1872 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1873 * The file will be opened again in the subsequent VFS open call
1874 * (nfs4_proc_file_open).
1875 *
1876 * The open for read will just hang around to be used by any process that
1877 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1878 */
1879
1880static int
1881nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1882 int flags, struct nameidata *nd)
1da177e4 1883{
ad389da7 1884 struct path path = {
4ac91378 1885 .mnt = nd->path.mnt,
ad389da7
TM		 1886 .dentry = dentry,
1887 };
1da177e4
LT		 1888 struct nfs4_state *state;
1889 struct rpc_cred *cred;
1890 int status = 0;
1891
98a8e323 1892 cred = rpc_lookup_cred();
1da177e4
LT		 1893 if (IS_ERR(cred)) {
1894 status = PTR_ERR(cred);
1895 goto out;
1896 }
ad389da7 1897 state = nfs4_do_open(dir, &path, flags, sattr, cred);
d4d9cdcb 1898 d_drop(dentry);
1da177e4
LT		 1899 if (IS_ERR(state)) {
1900 status = PTR_ERR(state);
659bfcd6 1901 goto out_putcred;
1da177e4 1902 }
d4d9cdcb 1903 d_add(dentry, igrab(state->inode));
d75340cc 1904 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 1905 if (flags & O_EXCL) {
1906 struct nfs_fattr fattr;
659bfcd6 1907 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
02a913a7 1908 if (status == 0)
65e4308d 1909 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1910 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1911 }
ad389da7 1912 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1913 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1914 else
a49c3c77 1915 nfs4_close_sync(&path, state, flags);
659bfcd6
TM		 1916out_putcred:
1917 put_rpccred(cred);
1da177e4
LT		 1918out:
1919 return status;
1920}
1921
1922static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1923{
16e42959 1924 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 1925 struct nfs_removeargs args = {
1da177e4 1926 .fh = NFS_FH(dir),
4fdc17b2
TM		 1927 .name.len = name->len,
1928 .name.name = name->name,
16e42959
TM		 1929 .bitmask = server->attr_bitmask,
1930 };
4fdc17b2 1931 struct nfs_removeres res = {
16e42959 1932 .server = server,
1da177e4 1933 };
1da177e4 1934 struct rpc_message msg = {
4fdc17b2
TM		 1935 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1936 .rpc_argp = &args,
1937 .rpc_resp = &res,
1da177e4
LT		 1938 };
1939 int status;
1940
4fdc17b2 1941 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 1942 status = rpc_call_sync(server->client, &msg, 0);
1943 if (status == 0) {
1944 update_changeattr(dir, &res.cinfo);
4fdc17b2 1945 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 1946 }
1da177e4
LT		 1947 return status;
1948}
1949
1950static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1951{
1952 struct nfs4_exception exception = { };
1953 int err;
1954 do {
1955 err = nfs4_handle_exception(NFS_SERVER(dir),
1956 _nfs4_proc_remove(dir, name),
1957 &exception);
1958 } while (exception.retry);
1959 return err;
1960}
1961
e4eff1a6 1962static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 1963{
e4eff1a6
TM		 1964 struct nfs_server *server = NFS_SERVER(dir);
1965 struct nfs_removeargs *args = msg->rpc_argp;
1966 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 1967
e4eff1a6
TM		 1968 args->bitmask = server->attr_bitmask;
1969 res->server = server;
1da177e4 1970 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 1971}
1972
e4eff1a6 1973static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 1974{
e4eff1a6
TM		 1975 struct nfs_removeres *res = task->tk_msg.rpc_resp;
1976
1977 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1978 return 0;
1979 update_changeattr(dir, &res->cinfo);
1980 nfs_post_op_update_inode(dir, &res->dir_attr);
1981 return 1;
1da177e4
LT		 1982}
1983
1984static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1985 struct inode *new_dir, struct qstr *new_name)
1986{
6caf2c82 1987 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1988 struct nfs4_rename_arg arg = {
1989 .old_dir = NFS_FH(old_dir),
1990 .new_dir = NFS_FH(new_dir),
1991 .old_name = old_name,
1992 .new_name = new_name,
6caf2c82
TM		 1993 .bitmask = server->attr_bitmask,
1994 };
1995 struct nfs_fattr old_fattr, new_fattr;
1996 struct nfs4_rename_res res = {
1997 .server = server,
1998 .old_fattr = &old_fattr,
1999 .new_fattr = &new_fattr,
1da177e4 2000 };
1da177e4
LT		 2001 struct rpc_message msg = {
2002 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2003 .rpc_argp = &arg,
2004 .rpc_resp = &res,
2005 };
2006 int status;
2007
6caf2c82
TM		 2008 nfs_fattr_init(res.old_fattr);
2009 nfs_fattr_init(res.new_fattr);
2010 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2011
2012 if (!status) {
2013 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2014 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2015 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2016 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2017 }
2018 return status;
2019}
2020
2021static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2022 struct inode *new_dir, struct qstr *new_name)
2023{
2024 struct nfs4_exception exception = { };
2025 int err;
2026 do {
2027 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2028 _nfs4_proc_rename(old_dir, old_name,
2029 new_dir, new_name),
2030 &exception);
2031 } while (exception.retry);
2032 return err;
2033}
2034
2035static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2036{
91ba2eee 2037 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2038 struct nfs4_link_arg arg = {
2039 .fh = NFS_FH(inode),
2040 .dir_fh = NFS_FH(dir),
2041 .name = name,
91ba2eee
TM		 2042 .bitmask = server->attr_bitmask,
2043 };
2044 struct nfs_fattr fattr, dir_attr;
2045 struct nfs4_link_res res = {
2046 .server = server,
2047 .fattr = &fattr,
2048 .dir_attr = &dir_attr,
1da177e4 2049 };
1da177e4
LT		 2050 struct rpc_message msg = {
2051 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2052 .rpc_argp = &arg,
91ba2eee 2053 .rpc_resp = &res,
1da177e4
LT		 2054 };
2055 int status;
2056
91ba2eee
TM		 2057 nfs_fattr_init(res.fattr);
2058 nfs_fattr_init(res.dir_attr);
2059 status = rpc_call_sync(server->client, &msg, 0);
2060 if (!status) {
2061 update_changeattr(dir, &res.cinfo);
2062 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2063 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2064 }
1da177e4
LT		 2065
2066 return status;
2067}
2068
2069static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2070{
2071 struct nfs4_exception exception = { };
2072 int err;
2073 do {
2074 err = nfs4_handle_exception(NFS_SERVER(inode),
2075 _nfs4_proc_link(inode, dir, name),
2076 &exception);
2077 } while (exception.retry);
2078 return err;
2079}
2080
57dc9a57
TM		 2081struct nfs4_createdata {
2082 struct rpc_message msg;
2083 struct nfs4_create_arg arg;
2084 struct nfs4_create_res res;
2085 struct nfs_fh fh;
2086 struct nfs_fattr fattr;
2087 struct nfs_fattr dir_fattr;
2088};
2089
2090static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2091 struct qstr *name, struct iattr *sattr, u32 ftype)
2092{
2093 struct nfs4_createdata *data;
2094
2095 data = kzalloc(sizeof(*data), GFP_KERNEL);
2096 if (data != NULL) {
2097 struct nfs_server *server = NFS_SERVER(dir);
2098
2099 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2100 data->msg.rpc_argp = &data->arg;
2101 data->msg.rpc_resp = &data->res;
2102 data->arg.dir_fh = NFS_FH(dir);
2103 data->arg.server = server;
2104 data->arg.name = name;
2105 data->arg.attrs = sattr;
2106 data->arg.ftype = ftype;
2107 data->arg.bitmask = server->attr_bitmask;
2108 data->res.server = server;
2109 data->res.fh = &data->fh;
2110 data->res.fattr = &data->fattr;
2111 data->res.dir_fattr = &data->dir_fattr;
2112 nfs_fattr_init(data->res.fattr);
2113 nfs_fattr_init(data->res.dir_fattr);
2114 }
2115 return data;
2116}
2117
2118static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2119{
2120 int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2121 if (status == 0) {
2122 update_changeattr(dir, &data->res.dir_cinfo);
2123 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2124 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2125 }
2126 return status;
2127}
2128
2129static void nfs4_free_createdata(struct nfs4_createdata *data)
2130{
2131 kfree(data);
2132}
2133
4f390c15 2134static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2135 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4 2136{
57dc9a57
TM		 2137 struct nfs4_createdata *data;
2138 int status = -ENAMETOOLONG;
1da177e4 2139
94a6d753 2140 if (len > NFS4_MAXPATHLEN)
57dc9a57 2141 goto out;
4f390c15 2142
57dc9a57
TM		 2143 status = -ENOMEM;
2144 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2145 if (data == NULL)
2146 goto out;
2147
2148 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2149 data->arg.u.symlink.pages = &page;
2150 data->arg.u.symlink.len = len;
1da177e4 2151
57dc9a57
TM		 2152 status = nfs4_do_create(dir, dentry, data);
2153
2154 nfs4_free_createdata(data);
2155out:
1da177e4
LT		 2156 return status;
2157}
2158
4f390c15 2159static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2160 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2161{
2162 struct nfs4_exception exception = { };
2163 int err;
2164 do {
2165 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2166 _nfs4_proc_symlink(dir, dentry, page,
2167 len, sattr),
1da177e4
LT		 2168 &exception);
2169 } while (exception.retry);
2170 return err;
2171}
2172
2173static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2174 struct iattr *sattr)
2175{
57dc9a57
TM		 2176 struct nfs4_createdata *data;
2177 int status = -ENOMEM;
1da177e4 2178
57dc9a57
TM		 2179 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2180 if (data == NULL)
2181 goto out;
2182
2183 status = nfs4_do_create(dir, dentry, data);
2184
2185 nfs4_free_createdata(data);
2186out:
1da177e4
LT		 2187 return status;
2188}
2189
2190static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2191 struct iattr *sattr)
2192{
2193 struct nfs4_exception exception = { };
2194 int err;
2195 do {
2196 err = nfs4_handle_exception(NFS_SERVER(dir),
2197 _nfs4_proc_mkdir(dir, dentry, sattr),
2198 &exception);
2199 } while (exception.retry);
2200 return err;
2201}
2202
2203static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2204 u64 cookie, struct page *page, unsigned int count, int plus)
2205{
2206 struct inode *dir = dentry->d_inode;
2207 struct nfs4_readdir_arg args = {
2208 .fh = NFS_FH(dir),
2209 .pages = &page,
2210 .pgbase = 0,
2211 .count = count,
2212 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2213 };
2214 struct nfs4_readdir_res res;
2215 struct rpc_message msg = {
2216 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2217 .rpc_argp = &args,
2218 .rpc_resp = &res,
2219 .rpc_cred = cred,
2220 };
2221 int status;
2222
3110ff80 2223 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
eadf4598
TM		 2224 dentry->d_parent->d_name.name,
2225 dentry->d_name.name,
2226 (unsigned long long)cookie);
1da177e4
LT		 2227 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2228 res.pgbase = args.pgbase;
2229 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2230 if (status == 0)
2231 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2232
2233 nfs_invalidate_atime(dir);
2234
3110ff80 2235 dprintk("%s: returns %d\n", __func__, status);
1da177e4
LT		 2236 return status;
2237}
2238
2239static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2240 u64 cookie, struct page *page, unsigned int count, int plus)
2241{
2242 struct nfs4_exception exception = { };
2243 int err;
2244 do {
2245 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2246 _nfs4_proc_readdir(dentry, cred, cookie,
2247 page, count, plus),
2248 &exception);
2249 } while (exception.retry);
2250 return err;
2251}
2252
2253static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2254 struct iattr *sattr, dev_t rdev)
2255{
57dc9a57
TM		 2256 struct nfs4_createdata *data;
2257 int mode = sattr->ia_mode;
2258 int status = -ENOMEM;
1da177e4
LT		 2259
2260 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2261 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
57dc9a57
TM		 2262
2263 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2264 if (data == NULL)
2265 goto out;
2266
1da177e4 2267 if (S_ISFIFO(mode))
57dc9a57 2268 data->arg.ftype = NF4FIFO;
1da177e4 2269 else if (S_ISBLK(mode)) {
57dc9a57
TM		 2270 data->arg.ftype = NF4BLK;
2271 data->arg.u.device.specdata1 = MAJOR(rdev);
2272 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4
LT		 2273 }
2274 else if (S_ISCHR(mode)) {
57dc9a57
TM		 2275 data->arg.ftype = NF4CHR;
2276 data->arg.u.device.specdata1 = MAJOR(rdev);
2277 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4 2278 }
1da177e4 2279
57dc9a57
TM		 2280 status = nfs4_do_create(dir, dentry, data);
2281
2282 nfs4_free_createdata(data);
2283out:
1da177e4
LT		 2284 return status;
2285}
2286
2287static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2288 struct iattr *sattr, dev_t rdev)
2289{
2290 struct nfs4_exception exception = { };
2291 int err;
2292 do {
2293 err = nfs4_handle_exception(NFS_SERVER(dir),
2294 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2295 &exception);
2296 } while (exception.retry);
2297 return err;
2298}
2299
2300static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2301 struct nfs_fsstat *fsstat)
2302{
2303 struct nfs4_statfs_arg args = {
2304 .fh = fhandle,
2305 .bitmask = server->attr_bitmask,
2306 };
2307 struct rpc_message msg = {
2308 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2309 .rpc_argp = &args,
2310 .rpc_resp = fsstat,
2311 };
2312
0e574af1 2313 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2314 return rpc_call_sync(server->client, &msg, 0);
2315}
2316
2317static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2318{
2319 struct nfs4_exception exception = { };
2320 int err;
2321 do {
2322 err = nfs4_handle_exception(server,
2323 _nfs4_proc_statfs(server, fhandle, fsstat),
2324 &exception);
2325 } while (exception.retry);
2326 return err;
2327}
2328
2329static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2330 struct nfs_fsinfo *fsinfo)
2331{
2332 struct nfs4_fsinfo_arg args = {
2333 .fh = fhandle,
2334 .bitmask = server->attr_bitmask,
2335 };
2336 struct rpc_message msg = {
2337 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2338 .rpc_argp = &args,
2339 .rpc_resp = fsinfo,
2340 };
2341
2342 return rpc_call_sync(server->client, &msg, 0);
2343}
2344
2345static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2346{
2347 struct nfs4_exception exception = { };
2348 int err;
2349
2350 do {
2351 err = nfs4_handle_exception(server,
2352 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2353 &exception);
2354 } while (exception.retry);
2355 return err;
2356}
2357
2358static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2359{
0e574af1 2360 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2361 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2362}
2363
2364static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2365 struct nfs_pathconf *pathconf)
2366{
2367 struct nfs4_pathconf_arg args = {
2368 .fh = fhandle,
2369 .bitmask = server->attr_bitmask,
2370 };
2371 struct rpc_message msg = {
2372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2373 .rpc_argp = &args,
2374 .rpc_resp = pathconf,
2375 };
2376
2377 /* None of the pathconf attributes are mandatory to implement */
2378 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2379 memset(pathconf, 0, sizeof(*pathconf));
2380 return 0;
2381 }
2382
0e574af1 2383 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2384 return rpc_call_sync(server->client, &msg, 0);
2385}
2386
2387static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2388 struct nfs_pathconf *pathconf)
2389{
2390 struct nfs4_exception exception = { };
2391 int err;
2392
2393 do {
2394 err = nfs4_handle_exception(server,
2395 _nfs4_proc_pathconf(server, fhandle, pathconf),
2396 &exception);
2397 } while (exception.retry);
2398 return err;
2399}
2400
ec06c096 2401static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2402{
ec06c096 2403 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2404
ec06c096 2405 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2406 rpc_restart_call(task);
ec06c096 2407 return -EAGAIN;
1da177e4 2408 }
8850df99
TM		 2409
2410 nfs_invalidate_atime(data->inode);
1da177e4 2411 if (task->tk_status > 0)
ec06c096
TM		 2412 renew_lease(server, data->timestamp);
2413 return 0;
1da177e4
LT		 2414}
2415
bdc7f021 2416static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
1da177e4 2417{
1da177e4 2418 data->timestamp = jiffies;
bdc7f021 2419 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
1da177e4
LT		 2420}
2421
788e7a89 2422static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2423{
1da177e4
LT		 2424 struct inode *inode = data->inode;
2425
2426 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2427 rpc_restart_call(task);
788e7a89 2428 return -EAGAIN;
1da177e4 2429 }
4f9838c7 2430 if (task->tk_status >= 0) {
1da177e4 2431 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2432 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2433 }
788e7a89 2434 return 0;
1da177e4
LT		 2435}
2436
bdc7f021 2437static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2438{
bdc7f021
TM		 2439 struct nfs_server *server = NFS_SERVER(data->inode);
2440
4f9838c7
TM		 2441 data->args.bitmask = server->attr_bitmask;
2442 data->res.server = server;
1da177e4
LT		 2443 data->timestamp = jiffies;
2444
bdc7f021 2445 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
1da177e4
LT		 2446}
2447
788e7a89 2448static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2449{
1da177e4
LT		 2450 struct inode *inode = data->inode;
2451
2452 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2453 rpc_restart_call(task);
788e7a89 2454 return -EAGAIN;
1da177e4 2455 }
9e08a3c5 2456 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2457 return 0;
1da177e4
LT		 2458}
2459
bdc7f021 2460static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2461{
788e7a89 2462 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2463
4f9838c7
TM		 2464 data->args.bitmask = server->attr_bitmask;
2465 data->res.server = server;
bdc7f021 2466 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
1da177e4
LT		 2467}
2468
2469/*
2470 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2471 * standalone procedure for queueing an asynchronous RENEW.
2472 */
963d8fe5 2473static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2474{
adfa6f98 2475 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2476 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2477
2478 if (task->tk_status < 0) {
2479 switch (task->tk_status) {
2480 case -NFS4ERR_STALE_CLIENTID:
2481 case -NFS4ERR_EXPIRED:
2482 case -NFS4ERR_CB_PATH_DOWN:
2483 nfs4_schedule_state_recovery(clp);
2484 }
2485 return;
2486 }
2487 spin_lock(&clp->cl_lock);
2488 if (time_before(clp->cl_last_renewal,timestamp))
2489 clp->cl_last_renewal = timestamp;
2490 spin_unlock(&clp->cl_lock);
2491}
2492
963d8fe5
TM		 2493static const struct rpc_call_ops nfs4_renew_ops = {
2494 .rpc_call_done = nfs4_renew_done,
2495};
2496
adfa6f98 2497int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2498{
2499 struct rpc_message msg = {
2500 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2501 .rpc_argp = clp,
b4454fe1 2502 .rpc_cred = cred,
1da177e4
LT		 2503 };
2504
2505 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2506 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2507}
2508
adfa6f98 2509int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2510{
2511 struct rpc_message msg = {
2512 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2513 .rpc_argp = clp,
b4454fe1 2514 .rpc_cred = cred,
1da177e4
LT		 2515 };
2516 unsigned long now = jiffies;
2517 int status;
2518
2519 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2520 if (status < 0)
2521 return status;
2522 spin_lock(&clp->cl_lock);
2523 if (time_before(clp->cl_last_renewal,now))
2524 clp->cl_last_renewal = now;
2525 spin_unlock(&clp->cl_lock);
2526 return 0;
2527}
2528
aa1870af
BF		 2529static inline int nfs4_server_supports_acls(struct nfs_server *server)
2530{
2531 return (server->caps & NFS_CAP_ACLS)
2532 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2533 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2534}
2535
2536/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2537 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2538 * the stack.
2539 */
2540#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2541
2542static void buf_to_pages(const void *buf, size_t buflen,
2543 struct page **pages, unsigned int *pgbase)
2544{
2545 const void *p = buf;
2546
2547 *pgbase = offset_in_page(buf);
2548 p -= *pgbase;
2549 while (p < buf + buflen) {
2550 *(pages++) = virt_to_page(p);
2551 p += PAGE_CACHE_SIZE;
2552 }
2553}
2554
e50a1c2e
BF		 2555struct nfs4_cached_acl {
2556 int cached;
2557 size_t len;
3e9d4154 2558 char data[0];
e50a1c2e
BF		 2559};
2560
2561static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2562{
2563 struct nfs_inode *nfsi = NFS_I(inode);
2564
2565 spin_lock(&inode->i_lock);
2566 kfree(nfsi->nfs4_acl);
2567 nfsi->nfs4_acl = acl;
2568 spin_unlock(&inode->i_lock);
2569}
2570
2571static void nfs4_zap_acl_attr(struct inode *inode)
2572{
2573 nfs4_set_cached_acl(inode, NULL);
2574}
2575
2576static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2577{
2578 struct nfs_inode *nfsi = NFS_I(inode);
2579 struct nfs4_cached_acl *acl;
2580 int ret = -ENOENT;
2581
2582 spin_lock(&inode->i_lock);
2583 acl = nfsi->nfs4_acl;
2584 if (acl == NULL)
2585 goto out;
2586 if (buf == NULL) /* user is just asking for length */
2587 goto out_len;
2588 if (acl->cached == 0)
2589 goto out;
2590 ret = -ERANGE; /* see getxattr(2) man page */
2591 if (acl->len > buflen)
2592 goto out;
2593 memcpy(buf, acl->data, acl->len);
2594out_len:
2595 ret = acl->len;
2596out:
2597 spin_unlock(&inode->i_lock);
2598 return ret;
2599}
2600
2601static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2602{
2603 struct nfs4_cached_acl *acl;
2604
2605 if (buf && acl_len <= PAGE_SIZE) {
2606 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2607 if (acl == NULL)
2608 goto out;
2609 acl->cached = 1;
2610 memcpy(acl->data, buf, acl_len);
2611 } else {
2612 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2613 if (acl == NULL)
2614 goto out;
2615 acl->cached = 0;
2616 }
2617 acl->len = acl_len;
2618out:
2619 nfs4_set_cached_acl(inode, acl);
2620}
2621
16b4289c 2622static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2623{
aa1870af
BF		 2624 struct page *pages[NFS4ACL_MAXPAGES];
2625 struct nfs_getaclargs args = {
2626 .fh = NFS_FH(inode),
2627 .acl_pages = pages,
2628 .acl_len = buflen,
2629 };
2630 size_t resp_len = buflen;
e50a1c2e 2631 void *resp_buf;
aa1870af
BF		 2632 struct rpc_message msg = {
2633 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2634 .rpc_argp = &args,
2635 .rpc_resp = &resp_len,
2636 };
e50a1c2e 2637 struct page *localpage = NULL;
aa1870af
BF		 2638 int ret;
2639
e50a1c2e
BF		 2640 if (buflen < PAGE_SIZE) {
2641 /* As long as we're doing a round trip to the server anyway,
2642 * let's be prepared for a page of acl data. */
2643 localpage = alloc_page(GFP_KERNEL);
2644 resp_buf = page_address(localpage);
2645 if (localpage == NULL)
2646 return -ENOMEM;
2647 args.acl_pages[0] = localpage;
2648 args.acl_pgbase = 0;
1d95db8e 2649 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2650 } else {
2651 resp_buf = buf;
2652 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2653 }
aa1870af 2654 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2655 if (ret)
2656 goto out_free;
2657 if (resp_len > args.acl_len)
2658 nfs4_write_cached_acl(inode, NULL, resp_len);
2659 else
2660 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2661 if (buf) {
2662 ret = -ERANGE;
2663 if (resp_len > buflen)
2664 goto out_free;
2665 if (localpage)
2666 memcpy(buf, resp_buf, resp_len);
2667 }
2668 ret = resp_len;
2669out_free:
2670 if (localpage)
2671 __free_page(localpage);
aa1870af
BF		 2672 return ret;
2673}
2674
16b4289c
TM		 2675static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2676{
2677 struct nfs4_exception exception = { };
2678 ssize_t ret;
2679 do {
2680 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2681 if (ret >= 0)
2682 break;
2683 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2684 } while (exception.retry);
2685 return ret;
2686}
2687
e50a1c2e
BF		 2688static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2689{
2690 struct nfs_server *server = NFS_SERVER(inode);
2691 int ret;
2692
2693 if (!nfs4_server_supports_acls(server))
2694 return -EOPNOTSUPP;
2695 ret = nfs_revalidate_inode(server, inode);
2696 if (ret < 0)
2697 return ret;
f41f7418
TM		 2698 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2699 nfs_zap_acl_cache(inode);
e50a1c2e
BF		 2700 ret = nfs4_read_cached_acl(inode, buf, buflen);
2701 if (ret != -ENOENT)
2702 return ret;
2703 return nfs4_get_acl_uncached(inode, buf, buflen);
2704}
2705
16b4289c 2706static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2707{
2708 struct nfs_server *server = NFS_SERVER(inode);
2709 struct page *pages[NFS4ACL_MAXPAGES];
2710 struct nfs_setaclargs arg = {
2711 .fh = NFS_FH(inode),
2712 .acl_pages = pages,
2713 .acl_len = buflen,
2714 };
2715 struct rpc_message msg = {
2716 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2717 .rpc_argp = &arg,
2718 .rpc_resp = NULL,
2719 };
2720 int ret;
2721
2722 if (!nfs4_server_supports_acls(server))
2723 return -EOPNOTSUPP;
642ac549 2724 nfs_inode_return_delegation(inode);
4b580ee3 2725 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2726 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
f41f7418
TM		 2727 nfs_access_zap_cache(inode);
2728 nfs_zap_acl_cache(inode);
4b580ee3
BF		 2729 return ret;
2730}
2731
16b4289c
TM		 2732static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2733{
2734 struct nfs4_exception exception = { };
2735 int err;
2736 do {
2737 err = nfs4_handle_exception(NFS_SERVER(inode),
2738 __nfs4_proc_set_acl(inode, buf, buflen),
2739 &exception);
2740 } while (exception.retry);
2741 return err;
2742}
2743
1da177e4 2744static int
faf5f49c 2745nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2746{
7539bbab 2747 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2748
2749 if (!clp || task->tk_status >= 0)
2750 return 0;
2751 switch(task->tk_status) {
2752 case -NFS4ERR_STALE_CLIENTID:
2753 case -NFS4ERR_STALE_STATEID:
2754 case -NFS4ERR_EXPIRED:
5d00837b 2755 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
1da177e4 2756 nfs4_schedule_state_recovery(clp);
433fbe4c 2757 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
fda13939 2758 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
1da177e4
LT		 2759 task->tk_status = 0;
2760 return -EAGAIN;
1da177e4 2761 case -NFS4ERR_DELAY:
2e96d286 2762 nfs_inc_server_stats(server, NFSIOS_DELAY);
006ea73e 2763 case -NFS4ERR_GRACE:
1da177e4
LT		 2764 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2765 task->tk_status = 0;
2766 return -EAGAIN;
2767 case -NFS4ERR_OLD_STATEID:
2768 task->tk_status = 0;
2769 return -EAGAIN;
2770 }
2771 task->tk_status = nfs4_map_errors(task->tk_status);
2772 return 0;
2773}
2774
150030b7 2775static int nfs4_wait_bit_killable(void *word)
433fbe4c 2776{
150030b7 2777 if (fatal_signal_pending(current))
433fbe4c
TM		 2778 return -ERESTARTSYS;
2779 schedule();
2780 return 0;
2781}
2782
adfa6f98 2783static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2784{
433fbe4c 2785 int res;
1da177e4
LT		 2786
2787 might_sleep();
2788
e148582e
TM		 2789 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2790
433fbe4c 2791 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
150030b7 2792 nfs4_wait_bit_killable, TASK_KILLABLE);
e148582e
TM		 2793
2794 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2795 return res;
2796}
2797
2798static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2799{
1da177e4
LT		 2800 int res = 0;
2801
2802 might_sleep();
2803
2804 if (*timeout <= 0)
2805 *timeout = NFS4_POLL_RETRY_MIN;
2806 if (*timeout > NFS4_POLL_RETRY_MAX)
2807 *timeout = NFS4_POLL_RETRY_MAX;
150030b7
MW		 2808 schedule_timeout_killable(*timeout);
2809 if (fatal_signal_pending(current))
2810 res = -ERESTARTSYS;
1da177e4
LT		 2811 *timeout <<= 1;
2812 return res;
2813}
2814
2815/* This is the error handling routine for processes that are allowed
2816 * to sleep.
2817 */
10afec90 2818static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2819{
7539bbab 2820 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2821 int ret = errorcode;
2822
2823 exception->retry = 0;
2824 switch(errorcode) {
2825 case 0:
2826 return 0;
2827 case -NFS4ERR_STALE_CLIENTID:
2828 case -NFS4ERR_STALE_STATEID:
2829 case -NFS4ERR_EXPIRED:
433fbe4c 2830 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2831 ret = nfs4_wait_clnt_recover(server->client, clp);
2832 if (ret == 0)
2833 exception->retry = 1;
2834 break;
c514983d 2835 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2836 case -NFS4ERR_GRACE:
2837 case -NFS4ERR_DELAY:
2838 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2839 if (ret != 0)
2840 break;
1da177e4 2841 case -NFS4ERR_OLD_STATEID:
2c56617d 2842 exception->retry = 1;
1da177e4
LT		 2843 }
2844 /* We failed to handle the error */
2845 return nfs4_map_errors(ret);
2846}
2847
adfa6f98 2848int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2849{
2850 nfs4_verifier sc_verifier;
2851 struct nfs4_setclientid setclientid = {
2852 .sc_verifier = &sc_verifier,
2853 .sc_prog = program,
2854 };
2855 struct rpc_message msg = {
2856 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2857 .rpc_argp = &setclientid,
2858 .rpc_resp = clp,
286d7d6a 2859 .rpc_cred = cred,
1da177e4 2860 };
bc4785cd 2861 __be32 *p;
1da177e4
LT		 2862 int loop = 0;
2863 int status;
2864
bc4785cd 2865 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2866 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2867 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2868
2869 for(;;) {
2870 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
69dd716c 2871 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
d4d3c507
CL		 2872 clp->cl_ipaddr,
2873 rpc_peeraddr2str(clp->cl_rpcclient,
2874 RPC_DISPLAY_ADDR),
69dd716c
TM		 2875 rpc_peeraddr2str(clp->cl_rpcclient,
2876 RPC_DISPLAY_PROTO),
78ea323b 2877 clp->cl_rpcclient->cl_auth->au_ops->au_name,
1da177e4
LT		 2878 clp->cl_id_uniquifier);
2879 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
d4d3c507
CL		 2880 sizeof(setclientid.sc_netid),
2881 rpc_peeraddr2str(clp->cl_rpcclient,
2882 RPC_DISPLAY_NETID));
1da177e4 2883 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
d4d3c507 2884 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
1da177e4
LT		 2885 clp->cl_ipaddr, port >> 8, port & 255);
2886
2887 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2888 if (status != -NFS4ERR_CLID_INUSE)
2889 break;
2890 if (signalled())
2891 break;
2892 if (loop++ & 1)
2893 ssleep(clp->cl_lease_time + 1);
2894 else
2895 if (++clp->cl_id_uniquifier == 0)
2896 break;
2897 }
2898 return status;
2899}
2900
adfa6f98 2901static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2902{
2903 struct nfs_fsinfo fsinfo;
2904 struct rpc_message msg = {
2905 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2906 .rpc_argp = clp,
2907 .rpc_resp = &fsinfo,
286d7d6a 2908 .rpc_cred = cred,
1da177e4
LT		 2909 };
2910 unsigned long now;
2911 int status;
2912
2913 now = jiffies;
2914 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2915 if (status == 0) {
2916 spin_lock(&clp->cl_lock);
2917 clp->cl_lease_time = fsinfo.lease_time * HZ;
2918 clp->cl_last_renewal = now;
58d9714a 2919 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2920 spin_unlock(&clp->cl_lock);
2921 }
2922 return status;
2923}
2924
adfa6f98 2925int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b 2926{
77e03677 2927 long timeout = 0;
51581f3b
TM		 2928 int err;
2929 do {
2930 err = _nfs4_proc_setclientid_confirm(clp, cred);
2931 switch (err) {
2932 case 0:
2933 return err;
2934 case -NFS4ERR_RESOURCE:
2935 /* The IBM lawyers misread another document! */
2936 case -NFS4ERR_DELAY:
2937 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2938 }
2939 } while (err == 0);
2940 return err;
2941}
2942
fe650407
TM		 2943struct nfs4_delegreturndata {
2944 struct nfs4_delegreturnargs args;
fa178f29 2945 struct nfs4_delegreturnres res;
fe650407
TM		 2946 struct nfs_fh fh;
2947 nfs4_stateid stateid;
26e976a8 2948 unsigned long timestamp;
fa178f29 2949 struct nfs_fattr fattr;
fe650407
TM		 2950 int rpc_status;
2951};
2952
fe650407
TM		 2953static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2954{
2955 struct nfs4_delegreturndata *data = calldata;
2956 data->rpc_status = task->tk_status;
26e976a8 2957 if (data->rpc_status == 0)
fa178f29 2958 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2959}
2960
2961static void nfs4_delegreturn_release(void *calldata)
2962{
fe650407
TM		 2963 kfree(calldata);
2964}
2965
c8d149f3 2966static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 2967 .rpc_call_done = nfs4_delegreturn_done,
2968 .rpc_release = nfs4_delegreturn_release,
2969};
2970
e6f81075 2971static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
fe650407
TM		 2972{
2973 struct nfs4_delegreturndata *data;
fa178f29 2974 struct nfs_server *server = NFS_SERVER(inode);
fe650407 2975 struct rpc_task *task;
5138fde0
TM		 2976 struct rpc_message msg = {
2977 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2978 .rpc_cred = cred,
2979 };
c970aa85
TM		 2980 struct rpc_task_setup task_setup_data = {
2981 .rpc_client = server->client,
5138fde0 2982 .rpc_message = &msg,
c970aa85
TM		 2983 .callback_ops = &nfs4_delegreturn_ops,
2984 .flags = RPC_TASK_ASYNC,
2985 };
e6f81075 2986 int status = 0;
fe650407
TM		 2987
2988 data = kmalloc(sizeof(*data), GFP_KERNEL);
2989 if (data == NULL)
2990 return -ENOMEM;
2991 data->args.fhandle = &data->fh;
2992 data->args.stateid = &data->stateid;
fa178f29 2993 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 2994 nfs_copy_fh(&data->fh, NFS_FH(inode));
2995 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 2996 data->res.fattr = &data->fattr;
2997 data->res.server = server;
5138fde0 2998 nfs_fattr_init(data->res.fattr);
26e976a8 2999 data->timestamp = jiffies;
fe650407
TM		 3000 data->rpc_status = 0;
3001
c970aa85 3002 task_setup_data.callback_data = data;
5138fde0
TM		 3003 msg.rpc_argp = &data->args,
3004 msg.rpc_resp = &data->res,
c970aa85 3005 task = rpc_run_task(&task_setup_data);
7a1218a2 3006 if (IS_ERR(task))
fe650407 3007 return PTR_ERR(task);
e6f81075
TM		 3008 if (!issync)
3009 goto out;
fe650407 3010 status = nfs4_wait_for_completion_rpc_task(task);
e6f81075
TM		 3011 if (status != 0)
3012 goto out;
3013 status = data->rpc_status;
3014 if (status != 0)
3015 goto out;
3016 nfs_refresh_inode(inode, &data->fattr);
3017out:
e6b3c4db 3018 rpc_put_task(task);
fe650407 3019 return status;
1da177e4
LT		 3020}
3021
e6f81075 3022int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
1da177e4
LT		 3023{
3024 struct nfs_server *server = NFS_SERVER(inode);
3025 struct nfs4_exception exception = { };
3026 int err;
3027 do {
e6f81075 3028 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
1da177e4
LT		 3029 switch (err) {
3030 case -NFS4ERR_STALE_STATEID:
3031 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3032 case 0:
3033 return 0;
3034 }
3035 err = nfs4_handle_exception(server, err, &exception);
3036 } while (exception.retry);
3037 return err;
3038}
3039
3040#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3041#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3042
3043/*
3044 * sleep, with exponential backoff, and retry the LOCK operation.
3045 */
3046static unsigned long
3047nfs4_set_lock_task_retry(unsigned long timeout)
3048{
150030b7 3049 schedule_timeout_killable(timeout);
1da177e4
LT		 3050 timeout <<= 1;
3051 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3052 return NFS4_LOCK_MAXTIMEOUT;
3053 return timeout;
3054}
3055
1da177e4
LT		 3056static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3057{
3058 struct inode *inode = state->inode;
3059 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3060 struct nfs_client *clp = server->nfs_client;
911d1aaf 3061 struct nfs_lockt_args arg = {
1da177e4 3062 .fh = NFS_FH(inode),
911d1aaf 3063 .fl = request,
1da177e4 3064 };
911d1aaf
TM		 3065 struct nfs_lockt_res res = {
3066 .denied = request,
1da177e4
LT		 3067 };
3068 struct rpc_message msg = {
3069 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3070 .rpc_argp = &arg,
3071 .rpc_resp = &res,
3072 .rpc_cred = state->owner->so_cred,
3073 };
1da177e4
LT		 3074 struct nfs4_lock_state *lsp;
3075 int status;
3076
3077 down_read(&clp->cl_sem);
911d1aaf 3078 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3079 status = nfs4_set_lock_state(state, request);
3080 if (status != 0)
3081 goto out;
3082 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3083 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3084 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3085 switch (status) {
3086 case 0:
3087 request->fl_type = F_UNLCK;
3088 break;
3089 case -NFS4ERR_DENIED:
3090 status = 0;
1da177e4 3091 }
70cc6487 3092 request->fl_ops->fl_release_private(request);
8d0a8a9d 3093out:
1da177e4
LT		 3094 up_read(&clp->cl_sem);
3095 return status;
3096}
3097
3098static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3099{
3100 struct nfs4_exception exception = { };
3101 int err;
3102
3103 do {
3104 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3105 _nfs4_proc_getlk(state, cmd, request),
3106 &exception);
3107 } while (exception.retry);
3108 return err;
3109}
3110
3111static int do_vfs_lock(struct file *file, struct file_lock *fl)
3112{
3113 int res = 0;
3114 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3115 case FL_POSIX:
3116 res = posix_lock_file_wait(file, fl);
3117 break;
3118 case FL_FLOCK:
3119 res = flock_lock_file_wait(file, fl);
3120 break;
3121 default:
3122 BUG();
3123 }
1da177e4
LT		 3124 return res;
3125}
3126
faf5f49c 3127struct nfs4_unlockdata {
911d1aaf
TM		 3128 struct nfs_locku_args arg;
3129 struct nfs_locku_res res;
faf5f49c
TM		 3130 struct nfs4_lock_state *lsp;
3131 struct nfs_open_context *ctx;
911d1aaf
TM		 3132 struct file_lock fl;
3133 const struct nfs_server *server;
26e976a8 3134 unsigned long timestamp;
faf5f49c
TM		 3135};
3136
911d1aaf
TM		 3137static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3138 struct nfs_open_context *ctx,
3139 struct nfs4_lock_state *lsp,
3140 struct nfs_seqid *seqid)
3141{
3142 struct nfs4_unlockdata *p;
3143 struct inode *inode = lsp->ls_state->inode;
3144
3145 p = kmalloc(sizeof(*p), GFP_KERNEL);
3146 if (p == NULL)
3147 return NULL;
3148 p->arg.fh = NFS_FH(inode);
3149 p->arg.fl = &p->fl;
3150 p->arg.seqid = seqid;
c1d51931 3151 p->res.seqid = seqid;
911d1aaf
TM		 3152 p->arg.stateid = &lsp->ls_stateid;
3153 p->lsp = lsp;
3154 atomic_inc(&lsp->ls_count);
3155 /* Ensure we don't close file until we're done freeing locks! */
3156 p->ctx = get_nfs_open_context(ctx);
3157 memcpy(&p->fl, fl, sizeof(p->fl));
3158 p->server = NFS_SERVER(inode);
3159 return p;
3160}
3161
06f814a3 3162static void nfs4_locku_release_calldata(void *data)
faf5f49c 3163{
963d8fe5 3164 struct nfs4_unlockdata *calldata = data;
911d1aaf 3165 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3166 nfs4_put_lock_state(calldata->lsp);
3167 put_nfs_open_context(calldata->ctx);
3168 kfree(calldata);
faf5f49c
TM		 3169}
3170
963d8fe5 3171static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3172{
963d8fe5 3173 struct nfs4_unlockdata *calldata = data;
faf5f49c 3174
06f814a3
TM		 3175 if (RPC_ASSASSINATED(task))
3176 return;
faf5f49c
TM		 3177 switch (task->tk_status) {
3178 case 0:
3179 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3180 calldata->res.stateid.data,
faf5f49c 3181 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3182 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3183 break;
3184 case -NFS4ERR_STALE_STATEID:
3185 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3186 break;
3187 default:
a6a352e9 3188 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3189 rpc_restart_call(task);
faf5f49c 3190 }
faf5f49c
TM		 3191}
3192
4ce70ada 3193static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3194{
4ce70ada 3195 struct nfs4_unlockdata *calldata = data;
faf5f49c 3196
911d1aaf 3197 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3198 return;
3199 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3200 /* Note: exit _without_ running nfs4_locku_done */
3201 task->tk_action = NULL;
faf5f49c
TM		 3202 return;
3203 }
26e976a8 3204 calldata->timestamp = jiffies;
5138fde0 3205 rpc_call_start(task);
faf5f49c
TM		 3206}
3207
963d8fe5 3208static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3209 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3210 .rpc_call_done = nfs4_locku_done,
06f814a3 3211 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3212};
3213
a5d16a4d
TM		 3214static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3215 struct nfs_open_context *ctx,
3216 struct nfs4_lock_state *lsp,
3217 struct nfs_seqid *seqid)
3218{
3219 struct nfs4_unlockdata *data;
5138fde0
TM		 3220 struct rpc_message msg = {
3221 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3222 .rpc_cred = ctx->cred,
3223 };
c970aa85
TM		 3224 struct rpc_task_setup task_setup_data = {
3225 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5138fde0 3226 .rpc_message = &msg,
c970aa85 3227 .callback_ops = &nfs4_locku_ops,
101070ca 3228 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3229 .flags = RPC_TASK_ASYNC,
3230 };
a5d16a4d 3231
137d6aca
FF		 3232 /* Ensure this is an unlock - when canceling a lock, the
3233 * canceled lock is passed in, and it won't be an unlock.
3234 */
3235 fl->fl_type = F_UNLCK;
3236
a5d16a4d
TM		 3237 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3238 if (data == NULL) {
3239 nfs_free_seqid(seqid);
3240 return ERR_PTR(-ENOMEM);
3241 }
3242
5138fde0
TM		 3243 msg.rpc_argp = &data->arg,
3244 msg.rpc_resp = &data->res,
c970aa85
TM		 3245 task_setup_data.callback_data = data;
3246 return rpc_run_task(&task_setup_data);
a5d16a4d
TM		 3247}
3248
faf5f49c
TM		 3249static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3250{
911d1aaf 3251 struct nfs_seqid *seqid;
1da177e4 3252 struct nfs4_lock_state *lsp;
06f814a3
TM		 3253 struct rpc_task *task;
3254 int status = 0;
536ff0f8 3255 unsigned char fl_flags = request->fl_flags;
faf5f49c 3256
8d0a8a9d 3257 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3258 /* Unlock _before_ we do the RPC call */
3259 request->fl_flags |= FL_EXISTS;
3260 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3261 goto out;
8d0a8a9d 3262 if (status != 0)
9b073574
TM		 3263 goto out;
3264 /* Is this a delegated lock? */
3265 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3266 goto out;
8d0a8a9d 3267 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3268 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3269 status = -ENOMEM;
911d1aaf 3270 if (seqid == NULL)
9b073574 3271 goto out;
cd3758e3 3272 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3273 status = PTR_ERR(task);
3274 if (IS_ERR(task))
9b073574 3275 goto out;
a5d16a4d 3276 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3277 rpc_put_task(task);
9b073574 3278out:
536ff0f8 3279 request->fl_flags = fl_flags;
1da177e4
LT		 3280 return status;
3281}
3282
a5d16a4d
TM		 3283struct nfs4_lockdata {
3284 struct nfs_lock_args arg;
3285 struct nfs_lock_res res;
3286 struct nfs4_lock_state *lsp;
3287 struct nfs_open_context *ctx;
3288 struct file_lock fl;
26e976a8 3289 unsigned long timestamp;
a5d16a4d
TM		 3290 int rpc_status;
3291 int cancelled;
3292};
3293
3294static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3295 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3296{
a5d16a4d
TM		 3297 struct nfs4_lockdata *p;
3298 struct inode *inode = lsp->ls_state->inode;
1da177e4 3299 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3300
3301 p = kzalloc(sizeof(*p), GFP_KERNEL);
3302 if (p == NULL)
3303 return NULL;
3304
3305 p->arg.fh = NFS_FH(inode);
3306 p->arg.fl = &p->fl;
2f74c0a0
TM		 3307 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3308 if (p->arg.open_seqid == NULL)
3309 goto out_free;
a5d16a4d
TM		 3310 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3311 if (p->arg.lock_seqid == NULL)
2f74c0a0 3312 goto out_free_seqid;
a5d16a4d 3313 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3314 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3315 p->arg.lock_owner.id = lsp->ls_id.id;
c1d51931 3316 p->res.lock_seqid = p->arg.lock_seqid;
a5d16a4d
TM		 3317 p->lsp = lsp;
3318 atomic_inc(&lsp->ls_count);
3319 p->ctx = get_nfs_open_context(ctx);
3320 memcpy(&p->fl, fl, sizeof(p->fl));
3321 return p;
2f74c0a0
TM		 3322out_free_seqid:
3323 nfs_free_seqid(p->arg.open_seqid);
a5d16a4d
TM		 3324out_free:
3325 kfree(p);
3326 return NULL;
3327}
3328
3329static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3330{
3331 struct nfs4_lockdata *data = calldata;
3332 struct nfs4_state *state = data->lsp->ls_state;
06735b34 3333
3110ff80 3334 dprintk("%s: begin!\n", __func__);
2f74c0a0
TM		 3335 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3336 return;
a5d16a4d
TM		 3337 /* Do we need to do an open_to_lock_owner? */
3338 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
e6e21970
TM		 3339 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3340 return;
a5d16a4d
TM		 3341 data->arg.open_stateid = &state->stateid;
3342 data->arg.new_lock_owner = 1;
c1d51931 3343 data->res.open_seqid = data->arg.open_seqid;
2f74c0a0
TM		 3344 } else
3345 data->arg.new_lock_owner = 0;
26e976a8 3346 data->timestamp = jiffies;
5138fde0 3347 rpc_call_start(task);
3110ff80 3348 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
a5d16a4d
TM		 3349}
3350
3351static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3352{
3353 struct nfs4_lockdata *data = calldata;
3354
3110ff80 3355 dprintk("%s: begin!\n", __func__);
a5d16a4d
TM		 3356
3357 data->rpc_status = task->tk_status;
3358 if (RPC_ASSASSINATED(task))
3359 goto out;
3360 if (data->arg.new_lock_owner != 0) {
a5d16a4d
TM		 3361 if (data->rpc_status == 0)
3362 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3363 else
3364 goto out;
3365 }
3366 if (data->rpc_status == 0) {
3367 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3368 sizeof(data->lsp->ls_stateid.data));
3369 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3370 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d 3371 }
a5d16a4d 3372out:
3110ff80 3373 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
a5d16a4d
TM		 3374}
3375
3376static void nfs4_lock_release(void *calldata)
3377{
3378 struct nfs4_lockdata *data = calldata;
3379
3110ff80 3380 dprintk("%s: begin!\n", __func__);
2f74c0a0 3381 nfs_free_seqid(data->arg.open_seqid);
a5d16a4d
TM		 3382 if (data->cancelled != 0) {
3383 struct rpc_task *task;
3384 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3385 data->arg.lock_seqid);
3386 if (!IS_ERR(task))
e6b3c4db 3387 rpc_put_task(task);
3110ff80 3388 dprintk("%s: cancelling lock!\n", __func__);
a5d16a4d
TM		 3389 } else
3390 nfs_free_seqid(data->arg.lock_seqid);
3391 nfs4_put_lock_state(data->lsp);
3392 put_nfs_open_context(data->ctx);
3393 kfree(data);
3110ff80 3394 dprintk("%s: done!\n", __func__);
a5d16a4d
TM		 3395}
3396
3397static const struct rpc_call_ops nfs4_lock_ops = {
3398 .rpc_call_prepare = nfs4_lock_prepare,
3399 .rpc_call_done = nfs4_lock_done,
3400 .rpc_release = nfs4_lock_release,
3401};
3402
3403static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3404{
3405 struct nfs4_lockdata *data;
3406 struct rpc_task *task;
5138fde0
TM		 3407 struct rpc_message msg = {
3408 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3409 .rpc_cred = state->owner->so_cred,
3410 };
c970aa85
TM		 3411 struct rpc_task_setup task_setup_data = {
3412 .rpc_client = NFS_CLIENT(state->inode),
5138fde0 3413 .rpc_message = &msg,
c970aa85 3414 .callback_ops = &nfs4_lock_ops,
101070ca 3415 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3416 .flags = RPC_TASK_ASYNC,
3417 };
a5d16a4d
TM		 3418 int ret;
3419
3110ff80 3420 dprintk("%s: begin!\n", __func__);
cd3758e3 3421 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3422 fl->fl_u.nfs4_fl.owner);
3423 if (data == NULL)
3424 return -ENOMEM;
3425 if (IS_SETLKW(cmd))
3426 data->arg.block = 1;
3427 if (reclaim != 0)
3428 data->arg.reclaim = 1;
5138fde0
TM		 3429 msg.rpc_argp = &data->arg,
3430 msg.rpc_resp = &data->res,
c970aa85
TM		 3431 task_setup_data.callback_data = data;
3432 task = rpc_run_task(&task_setup_data);
7a1218a2 3433 if (IS_ERR(task))
a5d16a4d 3434 return PTR_ERR(task);
a5d16a4d
TM		 3435 ret = nfs4_wait_for_completion_rpc_task(task);
3436 if (ret == 0) {
3437 ret = data->rpc_status;
3438 if (ret == -NFS4ERR_DENIED)
3439 ret = -EAGAIN;
3440 } else
3441 data->cancelled = 1;
e6b3c4db 3442 rpc_put_task(task);
3110ff80 3443 dprintk("%s: done, ret = %d!\n", __func__, ret);
a5d16a4d 3444 return ret;
1da177e4
LT		 3445}
3446
3447static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3448{
202b50dc
TM		 3449 struct nfs_server *server = NFS_SERVER(state->inode);
3450 struct nfs4_exception exception = { };
3451 int err;
3452
3453 do {
42a2d13e
TM		 3454 /* Cache the lock if possible... */
3455 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3456 return 0;
202b50dc
TM		 3457 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3458 if (err != -NFS4ERR_DELAY)
3459 break;
3460 nfs4_handle_exception(server, err, &exception);
3461 } while (exception.retry);
3462 return err;
1da177e4
LT		 3463}
3464
3465static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3466{
202b50dc
TM		 3467 struct nfs_server *server = NFS_SERVER(state->inode);
3468 struct nfs4_exception exception = { };
3469 int err;
3470
6bfc93ef
TM		 3471 err = nfs4_set_lock_state(state, request);
3472 if (err != 0)
3473 return err;
202b50dc 3474 do {
42a2d13e
TM		 3475 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3476 return 0;
202b50dc
TM		 3477 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3478 if (err != -NFS4ERR_DELAY)
3479 break;
3480 nfs4_handle_exception(server, err, &exception);
3481 } while (exception.retry);
3482 return err;
1da177e4
LT		 3483}
3484
3485static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3486{
adfa6f98 3487 struct nfs_client *clp = state->owner->so_client;
01c3b861 3488 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3489 int status;
3490
6bfc93ef 3491 /* Is this a delegated open? */
6bfc93ef
TM		 3492 status = nfs4_set_lock_state(state, request);
3493 if (status != 0)
3494 goto out;
01c3b861
TM		 3495 request->fl_flags |= FL_ACCESS;
3496 status = do_vfs_lock(request->fl_file, request);
3497 if (status < 0)
3498 goto out;
3499 down_read(&clp->cl_sem);
3500 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3501 struct nfs_inode *nfsi = NFS_I(state->inode);
3502 /* Yes: cache locks! */
3503 down_read(&nfsi->rwsem);
3504 /* ...but avoid races with delegation recall... */
3505 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3506 request->fl_flags = fl_flags & ~FL_SLEEP;
3507 status = do_vfs_lock(request->fl_file, request);
3508 up_read(&nfsi->rwsem);
3509 goto out_unlock;
3510 }
3511 up_read(&nfsi->rwsem);
3512 }
6bfc93ef
TM		 3513 status = _nfs4_do_setlk(state, cmd, request, 0);
3514 if (status != 0)
01c3b861 3515 goto out_unlock;
6bfc93ef 3516 /* Note: we always want to sleep here! */
01c3b861 3517 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef 3518 if (do_vfs_lock(request->fl_file, request) < 0)
3110ff80 3519 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
01c3b861 3520out_unlock:
1da177e4 3521 up_read(&clp->cl_sem);
01c3b861
TM		 3522out:
3523 request->fl_flags = fl_flags;
1da177e4
LT		 3524 return status;
3525}
3526
3527static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3528{
3529 struct nfs4_exception exception = { };
3530 int err;
3531
3532 do {
3533 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3534 _nfs4_proc_setlk(state, cmd, request),
3535 &exception);
3536 } while (exception.retry);
3537 return err;
3538}
3539
3540static int
3541nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3542{
3543 struct nfs_open_context *ctx;
3544 struct nfs4_state *state;
3545 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3546 int status;
3547
3548 /* verify open state */
cd3758e3 3549 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3550 state = ctx->state;
3551
3552 if (request->fl_start < 0 || request->fl_end < 0)
3553 return -EINVAL;
3554
3555 if (IS_GETLK(cmd))
3556 return nfs4_proc_getlk(state, F_GETLK, request);
3557
3558 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3559 return -EINVAL;
3560
3561 if (request->fl_type == F_UNLCK)
3562 return nfs4_proc_unlck(state, cmd, request);
3563
3564 do {
3565 status = nfs4_proc_setlk(state, cmd, request);
3566 if ((status != -EAGAIN) || IS_SETLK(cmd))
3567 break;
3568 timeout = nfs4_set_lock_task_retry(timeout);
3569 status = -ERESTARTSYS;
3570 if (signalled())
3571 break;
3572 } while(status < 0);
1da177e4
LT		 3573 return status;
3574}
3575
888e694c
TM		 3576int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3577{
3578 struct nfs_server *server = NFS_SERVER(state->inode);
3579 struct nfs4_exception exception = { };
3580 int err;
3581
3582 err = nfs4_set_lock_state(state, fl);
3583 if (err != 0)
3584 goto out;
3585 do {
3586 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3587 if (err != -NFS4ERR_DELAY)
3588 break;
3589 err = nfs4_handle_exception(server, err, &exception);
3590 } while (exception.retry);
3591out:
3592 return err;
3593}
6b3b5496 3594
aa1870af
BF		 3595#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3596
6b3b5496
BF		 3597int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3598 size_t buflen, int flags)
3599{
4b580ee3
BF		 3600 struct inode *inode = dentry->d_inode;
3601
3602 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3603 return -EOPNOTSUPP;
3604
4b580ee3 3605 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3606}
3607
3608/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3609 * and that's what we'll do for e.g. user attributes that haven't been set.
3610 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3611 * attributes in kernel-managed attribute namespaces. */
3612ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3613 size_t buflen)
3614{
aa1870af
BF		 3615 struct inode *inode = dentry->d_inode;
3616
3617 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3618 return -EOPNOTSUPP;
3619
3620 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3621}
3622
3623ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3624{
aa1870af 3625 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3626
096455a2
BF		 3627 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3628 return 0;
6b3b5496
BF		 3629 if (buf && buflen < len)
3630 return -ERANGE;
3631 if (buf)
aa1870af
BF		 3632 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3633 return len;
6b3b5496
BF		 3634}
3635
56659e99 3636int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3637 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3638{
3639 struct nfs_server *server = NFS_SERVER(dir);
3640 u32 bitmask[2] = {
361e624f
MN		 3641 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3642 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3643 };
3644 struct nfs4_fs_locations_arg args = {
3645 .dir_fh = NFS_FH(dir),
c228fd3a 3646 .name = name,
683b57b4
TM		 3647 .page = page,
3648 .bitmask = bitmask,
3649 };
3650 struct rpc_message msg = {
3651 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3652 .rpc_argp = &args,
7aaa0b3b 3653 .rpc_resp = fs_locations,
683b57b4
TM		 3654 };
3655 int status;
3656
3110ff80 3657 dprintk("%s: start\n", __func__);
c228fd3a 3658 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3659 fs_locations->server = server;
830b8e33 3660 fs_locations->nlocations = 0;
683b57b4 3661 status = rpc_call_sync(server->client, &msg, 0);
3110ff80 3662 dprintk("%s: returned status = %d\n", __func__, status);
683b57b4
TM		 3663 return status;
3664}
3665
1da177e4
LT		 3666struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3667 .recover_open = nfs4_open_reclaim,
3668 .recover_lock = nfs4_lock_reclaim,
3669};
3670
3671struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3672 .recover_open = nfs4_open_expired,
3673 .recover_lock = nfs4_lock_expired,
3674};
3675
92e1d5be 3676static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3677 .permission = nfs_permission,
3678 .getattr = nfs_getattr,
3679 .setattr = nfs_setattr,
3680 .getxattr = nfs4_getxattr,
3681 .setxattr = nfs4_setxattr,
3682 .listxattr = nfs4_listxattr,
3683};
3684
509de811 3685const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3686 .version = 4, /* protocol version */
3687 .dentry_ops = &nfs4_dentry_operations,
3688 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3689 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3690 .getroot = nfs4_proc_get_root,
3691 .getattr = nfs4_proc_getattr,
3692 .setattr = nfs4_proc_setattr,
2b3de441 3693 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3694 .lookup = nfs4_proc_lookup,
3695 .access = nfs4_proc_access,
3696 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3697 .create = nfs4_proc_create,
3698 .remove = nfs4_proc_remove,
3699 .unlink_setup = nfs4_proc_unlink_setup,
3700 .unlink_done = nfs4_proc_unlink_done,
3701 .rename = nfs4_proc_rename,
3702 .link = nfs4_proc_link,
3703 .symlink = nfs4_proc_symlink,
3704 .mkdir = nfs4_proc_mkdir,
3705 .rmdir = nfs4_proc_remove,
3706 .readdir = nfs4_proc_readdir,
3707 .mknod = nfs4_proc_mknod,
3708 .statfs = nfs4_proc_statfs,
3709 .fsinfo = nfs4_proc_fsinfo,
3710 .pathconf = nfs4_proc_pathconf,
e9326dca 3711 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3712 .decode_dirent = nfs4_decode_dirent,
3713 .read_setup = nfs4_proc_read_setup,
ec06c096 3714 .read_done = nfs4_read_done,
1da177e4 3715 .write_setup = nfs4_proc_write_setup,
788e7a89 3716 .write_done = nfs4_write_done,
1da177e4 3717 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3718 .commit_done = nfs4_commit_done,
1da177e4 3719 .lock = nfs4_proc_lock,
e50a1c2e 3720 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3721};
3722
3723/*
3724 * Local variables:
3725 * c-basic-offset: 8
3726 * End:
3727 */
Linux 6.x block layer and io_uring tree(s)