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rpc: minor cleanup of scheduler callback code
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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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();
454 lock_kernel();
af22f94a 455 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
aac00a8d
TM		 456 unlock_kernel();
457 if (ret != 0)
458 goto out;
459 ret = -EAGAIN;
460 rcu_read_lock();
461 delegation = rcu_dereference(nfsi->delegation);
6ee41268 462 /* If no delegation, try a cached open */
aac00a8d 463 if (delegation == NULL)
6ee41268 464 continue;
aac00a8d
TM		 465 /* Is the delegation still valid? */
466 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
467 continue;
468 rcu_read_unlock();
469 update_open_stateid(state, NULL, &stateid, open_mode);
470 goto out_return_state;
471 }
aac00a8d
TM		 472 rcu_read_unlock();
473out:
474 return ERR_PTR(ret);
475out_return_state:
476 atomic_inc(&state->count);
477 return state;
478}
479
24ac23ab
TM		 480static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
481{
482 struct inode *inode;
483 struct nfs4_state *state = NULL;
003707c7
TM		 484 struct nfs_delegation *delegation;
485 nfs4_stateid *deleg_stateid = NULL;
1b370bc2 486 int ret;
24ac23ab 487
aac00a8d 488 if (!data->rpc_done) {
6ee41268 489 state = nfs4_try_open_cached(data);
aac00a8d
TM		 490 goto out;
491 }
492
1b370bc2 493 ret = -EAGAIN;
24ac23ab 494 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1b370bc2 495 goto err;
24ac23ab 496 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1b370bc2 497 ret = PTR_ERR(inode);
03f28e3a 498 if (IS_ERR(inode))
1b370bc2
TM		 499 goto err;
500 ret = -ENOMEM;
24ac23ab
TM		 501 state = nfs4_get_open_state(inode, data->owner);
502 if (state == NULL)
1b370bc2 503 goto err_put_inode;
549d6ed5 504 if (data->o_res.delegation_type != 0) {
549d6ed5
TM		 505 int delegation_flags = 0;
506
003707c7
TM		 507 rcu_read_lock();
508 delegation = rcu_dereference(NFS_I(inode)->delegation);
509 if (delegation)
510 delegation_flags = delegation->flags;
511 rcu_read_unlock();
549d6ed5
TM		 512 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
513 nfs_inode_set_delegation(state->inode,
514 data->owner->so_cred,
515 &data->o_res);
516 else
517 nfs_inode_reclaim_delegation(state->inode,
518 data->owner->so_cred,
519 &data->o_res);
520 }
003707c7
TM		 521 rcu_read_lock();
522 delegation = rcu_dereference(NFS_I(inode)->delegation);
523 if (delegation != NULL)
524 deleg_stateid = &delegation->stateid;
525 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
526 rcu_read_unlock();
24ac23ab 527 iput(inode);
aac00a8d 528out:
24ac23ab 529 return state;
1b370bc2
TM		 530err_put_inode:
531 iput(inode);
532err:
533 return ERR_PTR(ret);
24ac23ab
TM		 534}
535
864472e9
TM		 536static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
537{
538 struct nfs_inode *nfsi = NFS_I(state->inode);
539 struct nfs_open_context *ctx;
540
541 spin_lock(&state->inode->i_lock);
542 list_for_each_entry(ctx, &nfsi->open_files, list) {
543 if (ctx->state != state)
544 continue;
545 get_nfs_open_context(ctx);
546 spin_unlock(&state->inode->i_lock);
547 return ctx;
548 }
549 spin_unlock(&state->inode->i_lock);
550 return ERR_PTR(-ENOENT);
551}
552
6f220ed5
TM		 553static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
554{
555 struct nfs4_opendata *opendata;
556
557 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
558 if (opendata == NULL)
559 return ERR_PTR(-ENOMEM);
560 opendata->state = state;
561 atomic_inc(&state->count);
562 return opendata;
563}
564
2ced46c2 565static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
864472e9 566{
2ced46c2 567 struct nfs4_state *newstate;
864472e9
TM		 568 int ret;
569
570 opendata->o_arg.open_flags = openflags;
2ced46c2
TM		 571 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
572 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
573 nfs4_init_opendata_res(opendata);
864472e9
TM		 574 ret = _nfs4_proc_open(opendata);
575 if (ret != 0)
576 return ret;
2ced46c2 577 newstate = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 578 if (IS_ERR(newstate))
579 return PTR_ERR(newstate);
580 nfs4_close_state(&opendata->path, newstate, openflags);
2ced46c2 581 *res = newstate;
864472e9
TM		 582 return 0;
583}
584
585static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
586{
864472e9 587 struct nfs4_state *newstate;
864472e9
TM		 588 int ret;
589
590 /* memory barrier prior to reading state->n_* */
2ced46c2 591 clear_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9
TM		 592 smp_rmb();
593 if (state->n_rdwr != 0) {
2ced46c2 594 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
864472e9
TM		 595 if (ret != 0)
596 return ret;
2ced46c2
TM		 597 if (newstate != state)
598 return -ESTALE;
864472e9
TM		 599 }
600 if (state->n_wronly != 0) {
2ced46c2 601 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
864472e9
TM		 602 if (ret != 0)
603 return ret;
2ced46c2
TM		 604 if (newstate != state)
605 return -ESTALE;
864472e9
TM		 606 }
607 if (state->n_rdonly != 0) {
2ced46c2 608 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
864472e9
TM		 609 if (ret != 0)
610 return ret;
2ced46c2
TM		 611 if (newstate != state)
612 return -ESTALE;
864472e9 613 }
1ac7e2fd
TM		 614 /*
615 * We may have performed cached opens for all three recoveries.
616 * Check if we need to update the current stateid.
617 */
618 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
619 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
8bda4e4c 620 write_seqlock(&state->seqlock);
1ac7e2fd
TM		 621 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
622 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
8bda4e4c 623 write_sequnlock(&state->seqlock);
1ac7e2fd 624 }
864472e9
TM		 625 return 0;
626}
627
1da177e4
LT		 628/*
629 * OPEN_RECLAIM:
630 * reclaim state on the server after a reboot.
1da177e4 631 */
539cd03a 632static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 633{
1ac7e2fd 634 struct nfs_delegation *delegation;
864472e9
TM		 635 struct nfs4_opendata *opendata;
636 int delegation_type = 0;
1da177e4
LT		 637 int status;
638
6f220ed5
TM		 639 opendata = nfs4_open_recoverdata_alloc(ctx, state);
640 if (IS_ERR(opendata))
641 return PTR_ERR(opendata);
864472e9
TM		 642 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
643 opendata->o_arg.fh = NFS_FH(state->inode);
1ac7e2fd
TM		 644 rcu_read_lock();
645 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
646 if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
65bbf6bd 647 delegation_type = delegation->type;
1ac7e2fd 648 rcu_read_unlock();
864472e9
TM		 649 opendata->o_arg.u.delegation_type = delegation_type;
650 status = nfs4_open_recover(opendata, state);
c6d00e63 651 nfs4_opendata_put(opendata);
1da177e4
LT		 652 return status;
653}
654
539cd03a 655static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 656{
657 struct nfs_server *server = NFS_SERVER(state->inode);
658 struct nfs4_exception exception = { };
659 int err;
660 do {
539cd03a 661 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 662 if (err != -NFS4ERR_DELAY)
663 break;
664 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 665 } while (exception.retry);
666 return err;
667}
668
864472e9
TM		 669static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
670{
671 struct nfs_open_context *ctx;
672 int ret;
673
674 ctx = nfs4_state_find_open_context(state);
675 if (IS_ERR(ctx))
676 return PTR_ERR(ctx);
539cd03a 677 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 678 put_nfs_open_context(ctx);
679 return ret;
680}
681
13437e12 682static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4 683{
e56e0b78 684 struct nfs4_opendata *opendata;
864472e9 685 int ret;
1da177e4 686
6f220ed5
TM		 687 opendata = nfs4_open_recoverdata_alloc(ctx, state);
688 if (IS_ERR(opendata))
689 return PTR_ERR(opendata);
e56e0b78 690 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
13437e12 691 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
e56e0b78 692 sizeof(opendata->o_arg.u.delegation.data));
864472e9 693 ret = nfs4_open_recover(opendata, state);
c6d00e63 694 nfs4_opendata_put(opendata);
864472e9 695 return ret;
1da177e4
LT		 696}
697
13437e12 698int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 699{
700 struct nfs4_exception exception = { };
539cd03a 701 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 702 int err;
703 do {
13437e12 704 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1da177e4
LT		 705 switch (err) {
706 case 0:
707 return err;
708 case -NFS4ERR_STALE_CLIENTID:
709 case -NFS4ERR_STALE_STATEID:
710 case -NFS4ERR_EXPIRED:
711 /* Don't recall a delegation if it was lost */
7539bbab 712 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 713 return err;
714 }
715 err = nfs4_handle_exception(server, err, &exception);
716 } while (exception.retry);
717 return err;
718}
719
cdd4e68b
TM		 720static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
721{
722 struct nfs4_opendata *data = calldata;
723
724 data->rpc_status = task->tk_status;
725 if (RPC_ASSASSINATED(task))
726 return;
26e976a8 727 if (data->rpc_status == 0) {
cdd4e68b
TM		 728 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
729 sizeof(data->o_res.stateid.data));
bb22629e 730 nfs_confirm_seqid(&data->owner->so_seqid, 0);
26e976a8 731 renew_lease(data->o_res.server, data->timestamp);
3e309914 732 data->rpc_done = 1;
26e976a8 733 }
cdd4e68b
TM		 734}
735
736static void nfs4_open_confirm_release(void *calldata)
737{
738 struct nfs4_opendata *data = calldata;
739 struct nfs4_state *state = NULL;
740
741 /* If this request hasn't been cancelled, do nothing */
742 if (data->cancelled == 0)
743 goto out_free;
744 /* In case of error, no cleanup! */
3e309914 745 if (!data->rpc_done)
cdd4e68b 746 goto out_free;
cdd4e68b 747 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 748 if (!IS_ERR(state))
4a35bd41 749 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 750out_free:
c6d00e63 751 nfs4_opendata_put(data);
cdd4e68b
TM		 752}
753
754static const struct rpc_call_ops nfs4_open_confirm_ops = {
cdd4e68b
TM		 755 .rpc_call_done = nfs4_open_confirm_done,
756 .rpc_release = nfs4_open_confirm_release,
757};
758
759/*
760 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
761 */
762static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
763{
764 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
765 struct rpc_task *task;
5138fde0
TM		 766 struct rpc_message msg = {
767 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
768 .rpc_argp = &data->c_arg,
769 .rpc_resp = &data->c_res,
770 .rpc_cred = data->owner->so_cred,
771 };
c970aa85
TM		 772 struct rpc_task_setup task_setup_data = {
773 .rpc_client = server->client,
5138fde0 774 .rpc_message = &msg,
c970aa85
TM		 775 .callback_ops = &nfs4_open_confirm_ops,
776 .callback_data = data,
101070ca 777 .workqueue = nfsiod_workqueue,
c970aa85
TM		 778 .flags = RPC_TASK_ASYNC,
779 };
1da177e4
LT		 780 int status;
781
c6d00e63 782 kref_get(&data->kref);
3e309914
TM		 783 data->rpc_done = 0;
784 data->rpc_status = 0;
5138fde0 785 data->timestamp = jiffies;
c970aa85 786 task = rpc_run_task(&task_setup_data);
7a1218a2 787 if (IS_ERR(task))
cdd4e68b 788 return PTR_ERR(task);
cdd4e68b
TM		 789 status = nfs4_wait_for_completion_rpc_task(task);
790 if (status != 0) {
791 data->cancelled = 1;
792 smp_wmb();
793 } else
794 status = data->rpc_status;
e6b3c4db 795 rpc_put_task(task);
1da177e4
LT		 796 return status;
797}
798
24ac23ab 799static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 800{
24ac23ab
TM		 801 struct nfs4_opendata *data = calldata;
802 struct nfs4_state_owner *sp = data->owner;
5138fde0 803
24ac23ab
TM		 804 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
805 return;
aac00a8d
TM		 806 /*
807 * Check if we still need to send an OPEN call, or if we can use
808 * a delegation instead.
809 */
810 if (data->state != NULL) {
811 struct nfs_delegation *delegation;
812
6ee41268
TM		 813 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
814 goto out_no_action;
aac00a8d
TM		 815 rcu_read_lock();
816 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
817 if (delegation != NULL &&
818 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
819 rcu_read_unlock();
6ee41268 820 goto out_no_action;
aac00a8d
TM		 821 }
822 rcu_read_unlock();
823 }
24ac23ab 824 /* Update sequence id. */
9f958ab8 825 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 826 data->o_arg.clientid = sp->so_client->cl_clientid;
6f220ed5 827 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
5138fde0 828 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
6f220ed5
TM		 829 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
830 }
26e976a8 831 data->timestamp = jiffies;
5138fde0 832 rpc_call_start(task);
6ee41268
TM		 833 return;
834out_no_action:
835 task->tk_action = NULL;
836
24ac23ab 837}
1da177e4 838
24ac23ab
TM		 839static void nfs4_open_done(struct rpc_task *task, void *calldata)
840{
841 struct nfs4_opendata *data = calldata;
1da177e4 842
24ac23ab
TM		 843 data->rpc_status = task->tk_status;
844 if (RPC_ASSASSINATED(task))
845 return;
846 if (task->tk_status == 0) {
847 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 848 case S_IFREG:
849 break;
850 case S_IFLNK:
24ac23ab 851 data->rpc_status = -ELOOP;
6f926b5b
TM		 852 break;
853 case S_IFDIR:
24ac23ab 854 data->rpc_status = -EISDIR;
6f926b5b
TM		 855 break;
856 default:
24ac23ab 857 data->rpc_status = -ENOTDIR;
6f926b5b 858 }
26e976a8 859 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 860 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
861 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 862 }
3e309914 863 data->rpc_done = 1;
24ac23ab 864}
6f926b5b 865
24ac23ab
TM		 866static void nfs4_open_release(void *calldata)
867{
868 struct nfs4_opendata *data = calldata;
869 struct nfs4_state *state = NULL;
870
871 /* If this request hasn't been cancelled, do nothing */
872 if (data->cancelled == 0)
873 goto out_free;
874 /* In case of error, no cleanup! */
3e309914 875 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 876 goto out_free;
877 /* In case we need an open_confirm, no cleanup! */
878 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
879 goto out_free;
24ac23ab 880 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 881 if (!IS_ERR(state))
4a35bd41 882 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 883out_free:
c6d00e63 884 nfs4_opendata_put(data);
24ac23ab
TM		 885}
886
887static const struct rpc_call_ops nfs4_open_ops = {
888 .rpc_call_prepare = nfs4_open_prepare,
889 .rpc_call_done = nfs4_open_done,
890 .rpc_release = nfs4_open_release,
891};
892
893/*
894 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
895 */
896static int _nfs4_proc_open(struct nfs4_opendata *data)
897{
898 struct inode *dir = data->dir->d_inode;
899 struct nfs_server *server = NFS_SERVER(dir);
900 struct nfs_openargs *o_arg = &data->o_arg;
901 struct nfs_openres *o_res = &data->o_res;
902 struct rpc_task *task;
5138fde0
TM		 903 struct rpc_message msg = {
904 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
905 .rpc_argp = o_arg,
906 .rpc_resp = o_res,
907 .rpc_cred = data->owner->so_cred,
908 };
c970aa85
TM		 909 struct rpc_task_setup task_setup_data = {
910 .rpc_client = server->client,
5138fde0 911 .rpc_message = &msg,
c970aa85
TM		 912 .callback_ops = &nfs4_open_ops,
913 .callback_data = data,
101070ca 914 .workqueue = nfsiod_workqueue,
c970aa85
TM		 915 .flags = RPC_TASK_ASYNC,
916 };
24ac23ab
TM		 917 int status;
918
c6d00e63 919 kref_get(&data->kref);
3e309914
TM		 920 data->rpc_done = 0;
921 data->rpc_status = 0;
2ced46c2 922 data->cancelled = 0;
c970aa85 923 task = rpc_run_task(&task_setup_data);
7a1218a2 924 if (IS_ERR(task))
24ac23ab 925 return PTR_ERR(task);
24ac23ab
TM		 926 status = nfs4_wait_for_completion_rpc_task(task);
927 if (status != 0) {
928 data->cancelled = 1;
929 smp_wmb();
930 } else
931 status = data->rpc_status;
e6b3c4db 932 rpc_put_task(task);
3e309914 933 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 934 return status;
935
9936781d
TM		 936 if (o_res->fh.size == 0)
937 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
938
56ae19f3
TM		 939 if (o_arg->open_flags & O_CREAT) {
940 update_changeattr(dir, &o_res->cinfo);
941 nfs_post_op_update_inode(dir, o_res->dir_attr);
942 } else
943 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 944 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 945 status = _nfs4_proc_open_confirm(data);
1da177e4 946 if (status != 0)
24ac23ab 947 return status;
1da177e4
LT		 948 }
949 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
9936781d 950 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 951 return 0;
1da177e4
LT		 952}
953
10afec90 954static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 955{
7539bbab 956 struct nfs_client *clp = server->nfs_client;
6b30954e 957 int ret;
58d9714a 958
6b30954e
TM		 959 for (;;) {
960 ret = nfs4_wait_clnt_recover(server->client, clp);
961 if (ret != 0)
962 return ret;
963 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
964 break;
58d9714a 965 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 966 }
967 return 0;
58d9714a
TM		 968}
969
1da177e4
LT		 970/*
971 * OPEN_EXPIRED:
972 * reclaim state on the server after a network partition.
973 * Assumes caller holds the appropriate lock
974 */
539cd03a 975static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 976{
e56e0b78 977 struct nfs4_opendata *opendata;
864472e9 978 int ret;
1da177e4 979
6f220ed5
TM		 980 opendata = nfs4_open_recoverdata_alloc(ctx, state);
981 if (IS_ERR(opendata))
982 return PTR_ERR(opendata);
864472e9 983 ret = nfs4_open_recover(opendata, state);
35d05778 984 if (ret == -ESTALE)
539cd03a 985 d_drop(ctx->path.dentry);
c6d00e63 986 nfs4_opendata_put(opendata);
864472e9 987 return ret;
1da177e4
LT		 988}
989
539cd03a 990static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 991{
539cd03a 992 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 993 struct nfs4_exception exception = { };
994 int err;
995
996 do {
539cd03a 997 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 998 if (err == -NFS4ERR_DELAY)
999 nfs4_handle_exception(server, err, &exception);
1000 } while (exception.retry);
1001 return err;
1002}
1003
1da177e4
LT		 1004static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1005{
1da177e4 1006 struct nfs_open_context *ctx;
864472e9 1007 int ret;
1da177e4 1008
864472e9
TM		 1009 ctx = nfs4_state_find_open_context(state);
1010 if (IS_ERR(ctx))
1011 return PTR_ERR(ctx);
539cd03a 1012 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1013 put_nfs_open_context(ctx);
1014 return ret;
1da177e4
LT		 1015}
1016
aa53ed54
JL		 1017/*
1018 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1019 * fields corresponding to attributes that were used to store the verifier.
1020 * Make sure we clobber those fields in the later setattr call
1021 */
1022static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1023{
1024 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1025 !(sattr->ia_valid & ATTR_ATIME_SET))
1026 sattr->ia_valid |= ATTR_ATIME;
1027
1028 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1029 !(sattr->ia_valid & ATTR_MTIME_SET))
1030 sattr->ia_valid |= ATTR_MTIME;
1031}
1032
1da177e4 1033/*
24ac23ab 1034 * Returns a referenced nfs4_state
1da177e4 1035 */
ad389da7 1036static 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		 1037{
1038 struct nfs4_state_owner *sp;
1039 struct nfs4_state *state = NULL;
1040 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 1041 struct nfs_client *clp = server->nfs_client;
e56e0b78 1042 struct nfs4_opendata *opendata;
aac00a8d 1043 int status;
1da177e4
LT		 1044
1045 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1046 status = -ENOMEM;
1047 if (!(sp = nfs4_get_state_owner(server, cred))) {
1048 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1049 goto out_err;
1050 }
58d9714a
TM		 1051 status = nfs4_recover_expired_lease(server);
1052 if (status != 0)
b4454fe1 1053 goto err_put_state_owner;
aac00a8d
TM		 1054 if (path->dentry->d_inode != NULL)
1055 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a
TM		 1056 down_read(&clp->cl_sem);
1057 status = -ENOMEM;
ad389da7 1058 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1059 if (opendata == NULL)
76723de0 1060 goto err_release_rwsem;
1da177e4 1061
aac00a8d
TM		 1062 if (path->dentry->d_inode != NULL)
1063 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1064
24ac23ab 1065 status = _nfs4_proc_open(opendata);
1da177e4 1066 if (status != 0)
c6d00e63 1067 goto err_opendata_put;
1da177e4 1068
aa53ed54
JL		 1069 if (opendata->o_arg.open_flags & O_EXCL)
1070 nfs4_exclusive_attrset(opendata, sattr);
1071
24ac23ab 1072 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1073 status = PTR_ERR(state);
1074 if (IS_ERR(state))
c6d00e63 1075 goto err_opendata_put;
c6d00e63 1076 nfs4_opendata_put(opendata);
1da177e4
LT		 1077 nfs4_put_state_owner(sp);
1078 up_read(&clp->cl_sem);
1079 *res = state;
1080 return 0;
c6d00e63
TM		 1081err_opendata_put:
1082 nfs4_opendata_put(opendata);
76723de0
TM		 1083err_release_rwsem:
1084 up_read(&clp->cl_sem);
e56e0b78
TM		 1085err_put_state_owner:
1086 nfs4_put_state_owner(sp);
1da177e4 1087out_err:
1da177e4
LT		 1088 *res = NULL;
1089 return status;
1090}
1091
1092
ad389da7 1093static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1094{
1095 struct nfs4_exception exception = { };
1096 struct nfs4_state *res;
1097 int status;
1098
1099 do {
ad389da7 1100 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1101 if (status == 0)
1102 break;
1103 /* NOTE: BAD_SEQID means the server and client disagree about the
1104 * book-keeping w.r.t. state-changing operations
1105 * (OPEN/CLOSE/LOCK/LOCKU...)
1106 * It is actually a sign of a bug on the client or on the server.
1107 *
1108 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1109 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1110 * have unhashed the old state_owner for us, and that we can
1111 * therefore safely retry using a new one. We should still warn
1112 * the user though...
1113 */
1114 if (status == -NFS4ERR_BAD_SEQID) {
6f43ddcc
TM		 1115 printk(KERN_WARNING "NFS: v4 server %s "
1116 " returned a bad sequence-id error!\n",
1117 NFS_SERVER(dir)->nfs_client->cl_hostname);
1da177e4
LT		 1118 exception.retry = 1;
1119 continue;
1120 }
550f5747
TM		 1121 /*
1122 * BAD_STATEID on OPEN means that the server cancelled our
1123 * state before it received the OPEN_CONFIRM.
1124 * Recover by retrying the request as per the discussion
1125 * on Page 181 of RFC3530.
1126 */
1127 if (status == -NFS4ERR_BAD_STATEID) {
1128 exception.retry = 1;
1129 continue;
1130 }
aac00a8d
TM		 1131 if (status == -EAGAIN) {
1132 /* We must have found a delegation */
1133 exception.retry = 1;
1134 continue;
1135 }
1da177e4
LT		 1136 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1137 status, &exception));
1138 } while (exception.retry);
1139 return res;
1140}
1141
3e4f6290
TM		 1142static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1143 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1144{
3e4f6290 1145 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1146 struct nfs_setattrargs arg = {
3e4f6290 1147 .fh = NFS_FH(inode),
1da177e4
LT		 1148 .iap = sattr,
1149 .server = server,
1150 .bitmask = server->attr_bitmask,
1151 };
1152 struct nfs_setattrres res = {
1153 .fattr = fattr,
1154 .server = server,
1155 };
1156 struct rpc_message msg = {
1157 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1158 .rpc_argp = &arg,
1159 .rpc_resp = &res,
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) {
1da177e4 1169 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1170 nfs4_copy_stateid(&arg.stateid, state, current->files);
1171 } else
1da177e4
LT		 1172 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1173
65e4308d 1174 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1175 if (status == 0 && state != NULL)
1176 renew_lease(server, timestamp);
65e4308d 1177 return status;
1da177e4
LT		 1178}
1179
3e4f6290
TM		 1180static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1181 struct iattr *sattr, 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,
3e4f6290 1188 _nfs4_do_setattr(inode, 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
TM		 1650 struct rpc_cred *cred;
1651 struct inode *inode = dentry->d_inode;
d530838b
TM		 1652 struct nfs_open_context *ctx;
1653 struct nfs4_state *state = NULL;
1da177e4
LT		 1654 int status;
1655
0e574af1 1656 nfs_fattr_init(fattr);
1da177e4 1657
98a8e323 1658 cred = rpc_lookup_cred();
08e9eac4
TM		 1659 if (IS_ERR(cred))
1660 return PTR_ERR(cred);
d530838b
TM		 1661
1662 /* Search for an existing open(O_WRITE) file */
1663 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1664 if (ctx != NULL)
1665 state = ctx->state;
08e9eac4 1666
3e4f6290 1667 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1668 if (status == 0)
1669 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1670 if (ctx != NULL)
1671 put_nfs_open_context(ctx);
08e9eac4 1672 put_rpccred(cred);
1da177e4
LT		 1673 return status;
1674}
1675
56659e99
TM		 1676static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1677 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1678 struct nfs_fattr *fattr)
1679{
1680 int status;
1681 struct nfs4_lookup_arg args = {
1682 .bitmask = server->attr_bitmask,
1683 .dir_fh = dirfh,
1684 .name = name,
1685 };
1686 struct nfs4_lookup_res res = {
1687 .server = server,
1688 .fattr = fattr,
1689 .fh = fhandle,
1690 };
1691 struct rpc_message msg = {
1692 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1693 .rpc_argp = &args,
1694 .rpc_resp = &res,
1695 };
1696
1697 nfs_fattr_init(fattr);
1698
1699 dprintk("NFS call lookupfh %s\n", name->name);
1700 status = rpc_call_sync(server->client, &msg, 0);
1701 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1702 return status;
1703}
1704
1705static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1706 struct qstr *name, struct nfs_fh *fhandle,
1707 struct nfs_fattr *fattr)
1708{
1709 struct nfs4_exception exception = { };
1710 int err;
1711 do {
4e56e082
TM		 1712 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1713 /* FIXME: !!!! */
1714 if (err == -NFS4ERR_MOVED) {
1715 err = -EREMOTE;
1716 break;
1717 }
1718 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1719 } while (exception.retry);
1720 return err;
1721}
1722
56659e99 1723static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1724 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1725{
4e56e082 1726 int status;
1da177e4
LT		 1727
1728 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1729 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1730 if (status == -NFS4ERR_MOVED)
1731 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1732 dprintk("NFS reply lookup: %d\n", status);
1733 return status;
1734}
1735
1736static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1737{
1738 struct nfs4_exception exception = { };
1739 int err;
1740 do {
1741 err = nfs4_handle_exception(NFS_SERVER(dir),
1742 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1743 &exception);
1744 } while (exception.retry);
1745 return err;
1746}
1747
1748static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1749{
76b32999
TM		 1750 struct nfs_server *server = NFS_SERVER(inode);
1751 struct nfs_fattr fattr;
1da177e4
LT		 1752 struct nfs4_accessargs args = {
1753 .fh = NFS_FH(inode),
76b32999
TM		 1754 .bitmask = server->attr_bitmask,
1755 };
1756 struct nfs4_accessres res = {
1757 .server = server,
1758 .fattr = &fattr,
1da177e4 1759 };
1da177e4
LT		 1760 struct rpc_message msg = {
1761 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1762 .rpc_argp = &args,
1763 .rpc_resp = &res,
1764 .rpc_cred = entry->cred,
1765 };
1766 int mode = entry->mask;
1767 int status;
1768
1769 /*
1770 * Determine which access bits we want to ask for...
1771 */
1772 if (mode & MAY_READ)
1773 args.access |= NFS4_ACCESS_READ;
1774 if (S_ISDIR(inode->i_mode)) {
1775 if (mode & MAY_WRITE)
1776 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1777 if (mode & MAY_EXEC)
1778 args.access |= NFS4_ACCESS_LOOKUP;
1779 } else {
1780 if (mode & MAY_WRITE)
1781 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1782 if (mode & MAY_EXEC)
1783 args.access |= NFS4_ACCESS_EXECUTE;
1784 }
76b32999 1785 nfs_fattr_init(&fattr);
1da177e4
LT		 1786 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1787 if (!status) {
1788 entry->mask = 0;
1789 if (res.access & NFS4_ACCESS_READ)
1790 entry->mask |= MAY_READ;
1791 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1792 entry->mask |= MAY_WRITE;
1793 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1794 entry->mask |= MAY_EXEC;
76b32999 1795 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1796 }
1797 return status;
1798}
1799
1800static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1801{
1802 struct nfs4_exception exception = { };
1803 int err;
1804 do {
1805 err = nfs4_handle_exception(NFS_SERVER(inode),
1806 _nfs4_proc_access(inode, entry),
1807 &exception);
1808 } while (exception.retry);
1809 return err;
1810}
1811
1812/*
1813 * TODO: For the time being, we don't try to get any attributes
1814 * along with any of the zero-copy operations READ, READDIR,
1815 * READLINK, WRITE.
1816 *
1817 * In the case of the first three, we want to put the GETATTR
1818 * after the read-type operation -- this is because it is hard
1819 * to predict the length of a GETATTR response in v4, and thus
1820 * align the READ data correctly. This means that the GETATTR
1821 * may end up partially falling into the page cache, and we should
1822 * shift it into the 'tail' of the xdr_buf before processing.
1823 * To do this efficiently, we need to know the total length
1824 * of data received, which doesn't seem to be available outside
1825 * of the RPC layer.
1826 *
1827 * In the case of WRITE, we also want to put the GETATTR after
1828 * the operation -- in this case because we want to make sure
1829 * we get the post-operation mtime and size. This means that
1830 * we can't use xdr_encode_pages() as written: we need a variant
1831 * of it which would leave room in the 'tail' iovec.
1832 *
1833 * Both of these changes to the XDR layer would in fact be quite
1834 * minor, but I decided to leave them for a subsequent patch.
1835 */
1836static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1837 unsigned int pgbase, unsigned int pglen)
1838{
1839 struct nfs4_readlink args = {
1840 .fh = NFS_FH(inode),
1841 .pgbase = pgbase,
1842 .pglen = pglen,
1843 .pages = &page,
1844 };
1845 struct rpc_message msg = {
1846 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1847 .rpc_argp = &args,
1848 .rpc_resp = NULL,
1849 };
1850
1851 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1852}
1853
1854static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1855 unsigned int pgbase, unsigned int pglen)
1856{
1857 struct nfs4_exception exception = { };
1858 int err;
1859 do {
1860 err = nfs4_handle_exception(NFS_SERVER(inode),
1861 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1862 &exception);
1863 } while (exception.retry);
1864 return err;
1865}
1866
1da177e4
LT		 1867/*
1868 * Got race?
1869 * We will need to arrange for the VFS layer to provide an atomic open.
1870 * Until then, this create/open method is prone to inefficiency and race
1871 * conditions due to the lookup, create, and open VFS calls from sys_open()
1872 * placed on the wire.
1873 *
1874 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1875 * The file will be opened again in the subsequent VFS open call
1876 * (nfs4_proc_file_open).
1877 *
1878 * The open for read will just hang around to be used by any process that
1879 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1880 */
1881
1882static int
1883nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1884 int flags, struct nameidata *nd)
1da177e4 1885{
ad389da7 1886 struct path path = {
4ac91378 1887 .mnt = nd->path.mnt,
ad389da7
TM		 1888 .dentry = dentry,
1889 };
1da177e4
LT		 1890 struct nfs4_state *state;
1891 struct rpc_cred *cred;
1892 int status = 0;
1893
98a8e323 1894 cred = rpc_lookup_cred();
1da177e4
LT		 1895 if (IS_ERR(cred)) {
1896 status = PTR_ERR(cred);
1897 goto out;
1898 }
ad389da7 1899 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1da177e4 1900 put_rpccred(cred);
d4d9cdcb 1901 d_drop(dentry);
1da177e4
LT		 1902 if (IS_ERR(state)) {
1903 status = PTR_ERR(state);
1904 goto out;
1905 }
d4d9cdcb 1906 d_add(dentry, igrab(state->inode));
d75340cc 1907 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 1908 if (flags & O_EXCL) {
1909 struct nfs_fattr fattr;
3e4f6290 1910 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1911 if (status == 0)
65e4308d 1912 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1913 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1914 }
ad389da7 1915 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1916 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1917 else
a49c3c77 1918 nfs4_close_sync(&path, state, flags);
1da177e4
LT		 1919out:
1920 return status;
1921}
1922
1923static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1924{
16e42959 1925 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 1926 struct nfs_removeargs args = {
1da177e4 1927 .fh = NFS_FH(dir),
4fdc17b2
TM		 1928 .name.len = name->len,
1929 .name.name = name->name,
16e42959
TM		 1930 .bitmask = server->attr_bitmask,
1931 };
4fdc17b2 1932 struct nfs_removeres res = {
16e42959 1933 .server = server,
1da177e4 1934 };
1da177e4 1935 struct rpc_message msg = {
4fdc17b2
TM		 1936 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1937 .rpc_argp = &args,
1938 .rpc_resp = &res,
1da177e4
LT		 1939 };
1940 int status;
1941
4fdc17b2 1942 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 1943 status = rpc_call_sync(server->client, &msg, 0);
1944 if (status == 0) {
1945 update_changeattr(dir, &res.cinfo);
4fdc17b2 1946 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 1947 }
1da177e4
LT		 1948 return status;
1949}
1950
1951static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1952{
1953 struct nfs4_exception exception = { };
1954 int err;
1955 do {
1956 err = nfs4_handle_exception(NFS_SERVER(dir),
1957 _nfs4_proc_remove(dir, name),
1958 &exception);
1959 } while (exception.retry);
1960 return err;
1961}
1962
e4eff1a6 1963static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 1964{
e4eff1a6
TM		 1965 struct nfs_server *server = NFS_SERVER(dir);
1966 struct nfs_removeargs *args = msg->rpc_argp;
1967 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 1968
e4eff1a6
TM		 1969 args->bitmask = server->attr_bitmask;
1970 res->server = server;
1da177e4 1971 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 1972}
1973
e4eff1a6 1974static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 1975{
e4eff1a6
TM		 1976 struct nfs_removeres *res = task->tk_msg.rpc_resp;
1977
1978 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1979 return 0;
1980 update_changeattr(dir, &res->cinfo);
1981 nfs_post_op_update_inode(dir, &res->dir_attr);
1982 return 1;
1da177e4
LT		 1983}
1984
1985static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1986 struct inode *new_dir, struct qstr *new_name)
1987{
6caf2c82 1988 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1989 struct nfs4_rename_arg arg = {
1990 .old_dir = NFS_FH(old_dir),
1991 .new_dir = NFS_FH(new_dir),
1992 .old_name = old_name,
1993 .new_name = new_name,
6caf2c82
TM		 1994 .bitmask = server->attr_bitmask,
1995 };
1996 struct nfs_fattr old_fattr, new_fattr;
1997 struct nfs4_rename_res res = {
1998 .server = server,
1999 .old_fattr = &old_fattr,
2000 .new_fattr = &new_fattr,
1da177e4 2001 };
1da177e4
LT		 2002 struct rpc_message msg = {
2003 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2004 .rpc_argp = &arg,
2005 .rpc_resp = &res,
2006 };
2007 int status;
2008
6caf2c82
TM		 2009 nfs_fattr_init(res.old_fattr);
2010 nfs_fattr_init(res.new_fattr);
2011 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2012
2013 if (!status) {
2014 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2015 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2016 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2017 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2018 }
2019 return status;
2020}
2021
2022static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2023 struct inode *new_dir, struct qstr *new_name)
2024{
2025 struct nfs4_exception exception = { };
2026 int err;
2027 do {
2028 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2029 _nfs4_proc_rename(old_dir, old_name,
2030 new_dir, new_name),
2031 &exception);
2032 } while (exception.retry);
2033 return err;
2034}
2035
2036static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2037{
91ba2eee 2038 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2039 struct nfs4_link_arg arg = {
2040 .fh = NFS_FH(inode),
2041 .dir_fh = NFS_FH(dir),
2042 .name = name,
91ba2eee
TM		 2043 .bitmask = server->attr_bitmask,
2044 };
2045 struct nfs_fattr fattr, dir_attr;
2046 struct nfs4_link_res res = {
2047 .server = server,
2048 .fattr = &fattr,
2049 .dir_attr = &dir_attr,
1da177e4 2050 };
1da177e4
LT		 2051 struct rpc_message msg = {
2052 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2053 .rpc_argp = &arg,
91ba2eee 2054 .rpc_resp = &res,
1da177e4
LT		 2055 };
2056 int status;
2057
91ba2eee
TM		 2058 nfs_fattr_init(res.fattr);
2059 nfs_fattr_init(res.dir_attr);
2060 status = rpc_call_sync(server->client, &msg, 0);
2061 if (!status) {
2062 update_changeattr(dir, &res.cinfo);
2063 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2064 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2065 }
1da177e4
LT		 2066
2067 return status;
2068}
2069
2070static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2071{
2072 struct nfs4_exception exception = { };
2073 int err;
2074 do {
2075 err = nfs4_handle_exception(NFS_SERVER(inode),
2076 _nfs4_proc_link(inode, dir, name),
2077 &exception);
2078 } while (exception.retry);
2079 return err;
2080}
2081
57dc9a57
TM		 2082struct nfs4_createdata {
2083 struct rpc_message msg;
2084 struct nfs4_create_arg arg;
2085 struct nfs4_create_res res;
2086 struct nfs_fh fh;
2087 struct nfs_fattr fattr;
2088 struct nfs_fattr dir_fattr;
2089};
2090
2091static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2092 struct qstr *name, struct iattr *sattr, u32 ftype)
2093{
2094 struct nfs4_createdata *data;
2095
2096 data = kzalloc(sizeof(*data), GFP_KERNEL);
2097 if (data != NULL) {
2098 struct nfs_server *server = NFS_SERVER(dir);
2099
2100 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2101 data->msg.rpc_argp = &data->arg;
2102 data->msg.rpc_resp = &data->res;
2103 data->arg.dir_fh = NFS_FH(dir);
2104 data->arg.server = server;
2105 data->arg.name = name;
2106 data->arg.attrs = sattr;
2107 data->arg.ftype = ftype;
2108 data->arg.bitmask = server->attr_bitmask;
2109 data->res.server = server;
2110 data->res.fh = &data->fh;
2111 data->res.fattr = &data->fattr;
2112 data->res.dir_fattr = &data->dir_fattr;
2113 nfs_fattr_init(data->res.fattr);
2114 nfs_fattr_init(data->res.dir_fattr);
2115 }
2116 return data;
2117}
2118
2119static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2120{
2121 int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2122 if (status == 0) {
2123 update_changeattr(dir, &data->res.dir_cinfo);
2124 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2125 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2126 }
2127 return status;
2128}
2129
2130static void nfs4_free_createdata(struct nfs4_createdata *data)
2131{
2132 kfree(data);
2133}
2134
4f390c15 2135static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2136 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4 2137{
57dc9a57
TM		 2138 struct nfs4_createdata *data;
2139 int status = -ENAMETOOLONG;
1da177e4 2140
94a6d753 2141 if (len > NFS4_MAXPATHLEN)
57dc9a57 2142 goto out;
4f390c15 2143
57dc9a57
TM		 2144 status = -ENOMEM;
2145 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2146 if (data == NULL)
2147 goto out;
2148
2149 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2150 data->arg.u.symlink.pages = &page;
2151 data->arg.u.symlink.len = len;
1da177e4 2152
57dc9a57
TM		 2153 status = nfs4_do_create(dir, dentry, data);
2154
2155 nfs4_free_createdata(data);
2156out:
1da177e4
LT		 2157 return status;
2158}
2159
4f390c15 2160static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2161 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2162{
2163 struct nfs4_exception exception = { };
2164 int err;
2165 do {
2166 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2167 _nfs4_proc_symlink(dir, dentry, page,
2168 len, sattr),
1da177e4
LT		 2169 &exception);
2170 } while (exception.retry);
2171 return err;
2172}
2173
2174static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2175 struct iattr *sattr)
2176{
57dc9a57
TM		 2177 struct nfs4_createdata *data;
2178 int status = -ENOMEM;
1da177e4 2179
57dc9a57
TM		 2180 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2181 if (data == NULL)
2182 goto out;
2183
2184 status = nfs4_do_create(dir, dentry, data);
2185
2186 nfs4_free_createdata(data);
2187out:
1da177e4
LT		 2188 return status;
2189}
2190
2191static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2192 struct iattr *sattr)
2193{
2194 struct nfs4_exception exception = { };
2195 int err;
2196 do {
2197 err = nfs4_handle_exception(NFS_SERVER(dir),
2198 _nfs4_proc_mkdir(dir, dentry, sattr),
2199 &exception);
2200 } while (exception.retry);
2201 return err;
2202}
2203
2204static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2205 u64 cookie, struct page *page, unsigned int count, int plus)
2206{
2207 struct inode *dir = dentry->d_inode;
2208 struct nfs4_readdir_arg args = {
2209 .fh = NFS_FH(dir),
2210 .pages = &page,
2211 .pgbase = 0,
2212 .count = count,
2213 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2214 };
2215 struct nfs4_readdir_res res;
2216 struct rpc_message msg = {
2217 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2218 .rpc_argp = &args,
2219 .rpc_resp = &res,
2220 .rpc_cred = cred,
2221 };
2222 int status;
2223
3110ff80 2224 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
eadf4598
TM		 2225 dentry->d_parent->d_name.name,
2226 dentry->d_name.name,
2227 (unsigned long long)cookie);
1da177e4
LT		 2228 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2229 res.pgbase = args.pgbase;
2230 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2231 if (status == 0)
2232 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2233
2234 nfs_invalidate_atime(dir);
2235
3110ff80 2236 dprintk("%s: returns %d\n", __func__, status);
1da177e4
LT		 2237 return status;
2238}
2239
2240static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2241 u64 cookie, struct page *page, unsigned int count, int plus)
2242{
2243 struct nfs4_exception exception = { };
2244 int err;
2245 do {
2246 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2247 _nfs4_proc_readdir(dentry, cred, cookie,
2248 page, count, plus),
2249 &exception);
2250 } while (exception.retry);
2251 return err;
2252}
2253
2254static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2255 struct iattr *sattr, dev_t rdev)
2256{
57dc9a57
TM		 2257 struct nfs4_createdata *data;
2258 int mode = sattr->ia_mode;
2259 int status = -ENOMEM;
1da177e4
LT		 2260
2261 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2262 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
57dc9a57
TM		 2263
2264 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2265 if (data == NULL)
2266 goto out;
2267
1da177e4 2268 if (S_ISFIFO(mode))
57dc9a57 2269 data->arg.ftype = NF4FIFO;
1da177e4 2270 else if (S_ISBLK(mode)) {
57dc9a57
TM		 2271 data->arg.ftype = NF4BLK;
2272 data->arg.u.device.specdata1 = MAJOR(rdev);
2273 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4
LT		 2274 }
2275 else if (S_ISCHR(mode)) {
57dc9a57
TM		 2276 data->arg.ftype = NF4CHR;
2277 data->arg.u.device.specdata1 = MAJOR(rdev);
2278 data->arg.u.device.specdata2 = MINOR(rdev);
1da177e4 2279 }
1da177e4 2280
57dc9a57
TM		 2281 status = nfs4_do_create(dir, dentry, data);
2282
2283 nfs4_free_createdata(data);
2284out:
1da177e4
LT		 2285 return status;
2286}
2287
2288static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2289 struct iattr *sattr, dev_t rdev)
2290{
2291 struct nfs4_exception exception = { };
2292 int err;
2293 do {
2294 err = nfs4_handle_exception(NFS_SERVER(dir),
2295 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2296 &exception);
2297 } while (exception.retry);
2298 return err;
2299}
2300
2301static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2302 struct nfs_fsstat *fsstat)
2303{
2304 struct nfs4_statfs_arg args = {
2305 .fh = fhandle,
2306 .bitmask = server->attr_bitmask,
2307 };
2308 struct rpc_message msg = {
2309 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2310 .rpc_argp = &args,
2311 .rpc_resp = fsstat,
2312 };
2313
0e574af1 2314 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2315 return rpc_call_sync(server->client, &msg, 0);
2316}
2317
2318static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2319{
2320 struct nfs4_exception exception = { };
2321 int err;
2322 do {
2323 err = nfs4_handle_exception(server,
2324 _nfs4_proc_statfs(server, fhandle, fsstat),
2325 &exception);
2326 } while (exception.retry);
2327 return err;
2328}
2329
2330static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2331 struct nfs_fsinfo *fsinfo)
2332{
2333 struct nfs4_fsinfo_arg args = {
2334 .fh = fhandle,
2335 .bitmask = server->attr_bitmask,
2336 };
2337 struct rpc_message msg = {
2338 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2339 .rpc_argp = &args,
2340 .rpc_resp = fsinfo,
2341 };
2342
2343 return rpc_call_sync(server->client, &msg, 0);
2344}
2345
2346static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2347{
2348 struct nfs4_exception exception = { };
2349 int err;
2350
2351 do {
2352 err = nfs4_handle_exception(server,
2353 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2354 &exception);
2355 } while (exception.retry);
2356 return err;
2357}
2358
2359static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2360{
0e574af1 2361 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2362 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2363}
2364
2365static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2366 struct nfs_pathconf *pathconf)
2367{
2368 struct nfs4_pathconf_arg args = {
2369 .fh = fhandle,
2370 .bitmask = server->attr_bitmask,
2371 };
2372 struct rpc_message msg = {
2373 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2374 .rpc_argp = &args,
2375 .rpc_resp = pathconf,
2376 };
2377
2378 /* None of the pathconf attributes are mandatory to implement */
2379 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2380 memset(pathconf, 0, sizeof(*pathconf));
2381 return 0;
2382 }
2383
0e574af1 2384 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2385 return rpc_call_sync(server->client, &msg, 0);
2386}
2387
2388static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2389 struct nfs_pathconf *pathconf)
2390{
2391 struct nfs4_exception exception = { };
2392 int err;
2393
2394 do {
2395 err = nfs4_handle_exception(server,
2396 _nfs4_proc_pathconf(server, fhandle, pathconf),
2397 &exception);
2398 } while (exception.retry);
2399 return err;
2400}
2401
ec06c096 2402static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2403{
ec06c096 2404 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2405
ec06c096 2406 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2407 rpc_restart_call(task);
ec06c096 2408 return -EAGAIN;
1da177e4 2409 }
8850df99
TM		 2410
2411 nfs_invalidate_atime(data->inode);
1da177e4 2412 if (task->tk_status > 0)
ec06c096
TM		 2413 renew_lease(server, data->timestamp);
2414 return 0;
1da177e4
LT		 2415}
2416
bdc7f021 2417static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
1da177e4 2418{
1da177e4 2419 data->timestamp = jiffies;
bdc7f021 2420 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
1da177e4
LT		 2421}
2422
788e7a89 2423static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2424{
1da177e4
LT		 2425 struct inode *inode = data->inode;
2426
2427 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2428 rpc_restart_call(task);
788e7a89 2429 return -EAGAIN;
1da177e4 2430 }
4f9838c7 2431 if (task->tk_status >= 0) {
1da177e4 2432 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2433 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2434 }
788e7a89 2435 return 0;
1da177e4
LT		 2436}
2437
bdc7f021 2438static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2439{
bdc7f021
TM		 2440 struct nfs_server *server = NFS_SERVER(data->inode);
2441
4f9838c7
TM		 2442 data->args.bitmask = server->attr_bitmask;
2443 data->res.server = server;
1da177e4
LT		 2444 data->timestamp = jiffies;
2445
bdc7f021 2446 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
1da177e4
LT		 2447}
2448
788e7a89 2449static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2450{
1da177e4
LT		 2451 struct inode *inode = data->inode;
2452
2453 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2454 rpc_restart_call(task);
788e7a89 2455 return -EAGAIN;
1da177e4 2456 }
9e08a3c5 2457 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2458 return 0;
1da177e4
LT		 2459}
2460
bdc7f021 2461static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
1da177e4 2462{
788e7a89 2463 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2464
4f9838c7
TM		 2465 data->args.bitmask = server->attr_bitmask;
2466 data->res.server = server;
bdc7f021 2467 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
1da177e4
LT		 2468}
2469
2470/*
2471 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2472 * standalone procedure for queueing an asynchronous RENEW.
2473 */
963d8fe5 2474static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2475{
adfa6f98 2476 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2477 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2478
2479 if (task->tk_status < 0) {
2480 switch (task->tk_status) {
2481 case -NFS4ERR_STALE_CLIENTID:
2482 case -NFS4ERR_EXPIRED:
2483 case -NFS4ERR_CB_PATH_DOWN:
2484 nfs4_schedule_state_recovery(clp);
2485 }
2486 return;
2487 }
2488 spin_lock(&clp->cl_lock);
2489 if (time_before(clp->cl_last_renewal,timestamp))
2490 clp->cl_last_renewal = timestamp;
2491 spin_unlock(&clp->cl_lock);
2492}
2493
963d8fe5
TM		 2494static const struct rpc_call_ops nfs4_renew_ops = {
2495 .rpc_call_done = nfs4_renew_done,
2496};
2497
adfa6f98 2498int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2499{
2500 struct rpc_message msg = {
2501 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2502 .rpc_argp = clp,
b4454fe1 2503 .rpc_cred = cred,
1da177e4
LT		 2504 };
2505
2506 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2507 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2508}
2509
adfa6f98 2510int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2511{
2512 struct rpc_message msg = {
2513 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2514 .rpc_argp = clp,
b4454fe1 2515 .rpc_cred = cred,
1da177e4
LT		 2516 };
2517 unsigned long now = jiffies;
2518 int status;
2519
2520 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2521 if (status < 0)
2522 return status;
2523 spin_lock(&clp->cl_lock);
2524 if (time_before(clp->cl_last_renewal,now))
2525 clp->cl_last_renewal = now;
2526 spin_unlock(&clp->cl_lock);
2527 return 0;
2528}
2529
aa1870af
BF		 2530static inline int nfs4_server_supports_acls(struct nfs_server *server)
2531{
2532 return (server->caps & NFS_CAP_ACLS)
2533 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2534 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2535}
2536
2537/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2538 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2539 * the stack.
2540 */
2541#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2542
2543static void buf_to_pages(const void *buf, size_t buflen,
2544 struct page **pages, unsigned int *pgbase)
2545{
2546 const void *p = buf;
2547
2548 *pgbase = offset_in_page(buf);
2549 p -= *pgbase;
2550 while (p < buf + buflen) {
2551 *(pages++) = virt_to_page(p);
2552 p += PAGE_CACHE_SIZE;
2553 }
2554}
2555
e50a1c2e
BF		 2556struct nfs4_cached_acl {
2557 int cached;
2558 size_t len;
3e9d4154 2559 char data[0];
e50a1c2e
BF		 2560};
2561
2562static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2563{
2564 struct nfs_inode *nfsi = NFS_I(inode);
2565
2566 spin_lock(&inode->i_lock);
2567 kfree(nfsi->nfs4_acl);
2568 nfsi->nfs4_acl = acl;
2569 spin_unlock(&inode->i_lock);
2570}
2571
2572static void nfs4_zap_acl_attr(struct inode *inode)
2573{
2574 nfs4_set_cached_acl(inode, NULL);
2575}
2576
2577static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2578{
2579 struct nfs_inode *nfsi = NFS_I(inode);
2580 struct nfs4_cached_acl *acl;
2581 int ret = -ENOENT;
2582
2583 spin_lock(&inode->i_lock);
2584 acl = nfsi->nfs4_acl;
2585 if (acl == NULL)
2586 goto out;
2587 if (buf == NULL) /* user is just asking for length */
2588 goto out_len;
2589 if (acl->cached == 0)
2590 goto out;
2591 ret = -ERANGE; /* see getxattr(2) man page */
2592 if (acl->len > buflen)
2593 goto out;
2594 memcpy(buf, acl->data, acl->len);
2595out_len:
2596 ret = acl->len;
2597out:
2598 spin_unlock(&inode->i_lock);
2599 return ret;
2600}
2601
2602static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2603{
2604 struct nfs4_cached_acl *acl;
2605
2606 if (buf && acl_len <= PAGE_SIZE) {
2607 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2608 if (acl == NULL)
2609 goto out;
2610 acl->cached = 1;
2611 memcpy(acl->data, buf, acl_len);
2612 } else {
2613 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2614 if (acl == NULL)
2615 goto out;
2616 acl->cached = 0;
2617 }
2618 acl->len = acl_len;
2619out:
2620 nfs4_set_cached_acl(inode, acl);
2621}
2622
16b4289c 2623static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2624{
aa1870af
BF		 2625 struct page *pages[NFS4ACL_MAXPAGES];
2626 struct nfs_getaclargs args = {
2627 .fh = NFS_FH(inode),
2628 .acl_pages = pages,
2629 .acl_len = buflen,
2630 };
2631 size_t resp_len = buflen;
e50a1c2e 2632 void *resp_buf;
aa1870af
BF		 2633 struct rpc_message msg = {
2634 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2635 .rpc_argp = &args,
2636 .rpc_resp = &resp_len,
2637 };
e50a1c2e 2638 struct page *localpage = NULL;
aa1870af
BF		 2639 int ret;
2640
e50a1c2e
BF		 2641 if (buflen < PAGE_SIZE) {
2642 /* As long as we're doing a round trip to the server anyway,
2643 * let's be prepared for a page of acl data. */
2644 localpage = alloc_page(GFP_KERNEL);
2645 resp_buf = page_address(localpage);
2646 if (localpage == NULL)
2647 return -ENOMEM;
2648 args.acl_pages[0] = localpage;
2649 args.acl_pgbase = 0;
1d95db8e 2650 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2651 } else {
2652 resp_buf = buf;
2653 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2654 }
aa1870af 2655 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2656 if (ret)
2657 goto out_free;
2658 if (resp_len > args.acl_len)
2659 nfs4_write_cached_acl(inode, NULL, resp_len);
2660 else
2661 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2662 if (buf) {
2663 ret = -ERANGE;
2664 if (resp_len > buflen)
2665 goto out_free;
2666 if (localpage)
2667 memcpy(buf, resp_buf, resp_len);
2668 }
2669 ret = resp_len;
2670out_free:
2671 if (localpage)
2672 __free_page(localpage);
aa1870af
BF		 2673 return ret;
2674}
2675
16b4289c
TM		 2676static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2677{
2678 struct nfs4_exception exception = { };
2679 ssize_t ret;
2680 do {
2681 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2682 if (ret >= 0)
2683 break;
2684 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2685 } while (exception.retry);
2686 return ret;
2687}
2688
e50a1c2e
BF		 2689static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2690{
2691 struct nfs_server *server = NFS_SERVER(inode);
2692 int ret;
2693
2694 if (!nfs4_server_supports_acls(server))
2695 return -EOPNOTSUPP;
2696 ret = nfs_revalidate_inode(server, inode);
2697 if (ret < 0)
2698 return ret;
2699 ret = nfs4_read_cached_acl(inode, buf, buflen);
2700 if (ret != -ENOENT)
2701 return ret;
2702 return nfs4_get_acl_uncached(inode, buf, buflen);
2703}
2704
16b4289c 2705static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2706{
2707 struct nfs_server *server = NFS_SERVER(inode);
2708 struct page *pages[NFS4ACL_MAXPAGES];
2709 struct nfs_setaclargs arg = {
2710 .fh = NFS_FH(inode),
2711 .acl_pages = pages,
2712 .acl_len = buflen,
2713 };
2714 struct rpc_message msg = {
2715 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2716 .rpc_argp = &arg,
2717 .rpc_resp = NULL,
2718 };
2719 int ret;
2720
2721 if (!nfs4_server_supports_acls(server))
2722 return -EOPNOTSUPP;
642ac549 2723 nfs_inode_return_delegation(inode);
4b580ee3 2724 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2725 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
08efa202 2726 nfs_zap_caches(inode);
4b580ee3
BF		 2727 return ret;
2728}
2729
16b4289c
TM		 2730static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2731{
2732 struct nfs4_exception exception = { };
2733 int err;
2734 do {
2735 err = nfs4_handle_exception(NFS_SERVER(inode),
2736 __nfs4_proc_set_acl(inode, buf, buflen),
2737 &exception);
2738 } while (exception.retry);
2739 return err;
2740}
2741
1da177e4 2742static int
faf5f49c 2743nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2744{
7539bbab 2745 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2746
2747 if (!clp || task->tk_status >= 0)
2748 return 0;
2749 switch(task->tk_status) {
2750 case -NFS4ERR_STALE_CLIENTID:
2751 case -NFS4ERR_STALE_STATEID:
2752 case -NFS4ERR_EXPIRED:
5d00837b 2753 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
1da177e4 2754 nfs4_schedule_state_recovery(clp);
433fbe4c 2755 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
fda13939 2756 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
1da177e4
LT		 2757 task->tk_status = 0;
2758 return -EAGAIN;
1da177e4 2759 case -NFS4ERR_DELAY:
006ea73e
CL		 2760 nfs_inc_server_stats((struct nfs_server *) server,
2761 NFSIOS_DELAY);
2762 case -NFS4ERR_GRACE:
1da177e4
LT		 2763 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2764 task->tk_status = 0;
2765 return -EAGAIN;
2766 case -NFS4ERR_OLD_STATEID:
2767 task->tk_status = 0;
2768 return -EAGAIN;
2769 }
2770 task->tk_status = nfs4_map_errors(task->tk_status);
2771 return 0;
2772}
2773
150030b7 2774static int nfs4_wait_bit_killable(void *word)
433fbe4c 2775{
150030b7 2776 if (fatal_signal_pending(current))
433fbe4c
TM		 2777 return -ERESTARTSYS;
2778 schedule();
2779 return 0;
2780}
2781
adfa6f98 2782static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2783{
433fbe4c 2784 int res;
1da177e4
LT		 2785
2786 might_sleep();
2787
e148582e
TM		 2788 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2789
433fbe4c 2790 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
150030b7 2791 nfs4_wait_bit_killable, TASK_KILLABLE);
e148582e
TM		 2792
2793 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2794 return res;
2795}
2796
2797static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2798{
1da177e4
LT		 2799 int res = 0;
2800
2801 might_sleep();
2802
2803 if (*timeout <= 0)
2804 *timeout = NFS4_POLL_RETRY_MIN;
2805 if (*timeout > NFS4_POLL_RETRY_MAX)
2806 *timeout = NFS4_POLL_RETRY_MAX;
150030b7
MW		 2807 schedule_timeout_killable(*timeout);
2808 if (fatal_signal_pending(current))
2809 res = -ERESTARTSYS;
1da177e4
LT		 2810 *timeout <<= 1;
2811 return res;
2812}
2813
2814/* This is the error handling routine for processes that are allowed
2815 * to sleep.
2816 */
10afec90 2817static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2818{
7539bbab 2819 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2820 int ret = errorcode;
2821
2822 exception->retry = 0;
2823 switch(errorcode) {
2824 case 0:
2825 return 0;
2826 case -NFS4ERR_STALE_CLIENTID:
2827 case -NFS4ERR_STALE_STATEID:
2828 case -NFS4ERR_EXPIRED:
433fbe4c 2829 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2830 ret = nfs4_wait_clnt_recover(server->client, clp);
2831 if (ret == 0)
2832 exception->retry = 1;
2833 break;
c514983d 2834 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2835 case -NFS4ERR_GRACE:
2836 case -NFS4ERR_DELAY:
2837 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2838 if (ret != 0)
2839 break;
1da177e4 2840 case -NFS4ERR_OLD_STATEID:
2c56617d 2841 exception->retry = 1;
1da177e4
LT		 2842 }
2843 /* We failed to handle the error */
2844 return nfs4_map_errors(ret);
2845}
2846
adfa6f98 2847int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2848{
2849 nfs4_verifier sc_verifier;
2850 struct nfs4_setclientid setclientid = {
2851 .sc_verifier = &sc_verifier,
2852 .sc_prog = program,
2853 };
2854 struct rpc_message msg = {
2855 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2856 .rpc_argp = &setclientid,
2857 .rpc_resp = clp,
286d7d6a 2858 .rpc_cred = cred,
1da177e4 2859 };
bc4785cd 2860 __be32 *p;
1da177e4
LT		 2861 int loop = 0;
2862 int status;
2863
bc4785cd 2864 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2865 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2866 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2867
2868 for(;;) {
2869 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
69dd716c 2870 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
d4d3c507
CL		 2871 clp->cl_ipaddr,
2872 rpc_peeraddr2str(clp->cl_rpcclient,
2873 RPC_DISPLAY_ADDR),
69dd716c
TM		 2874 rpc_peeraddr2str(clp->cl_rpcclient,
2875 RPC_DISPLAY_PROTO),
78ea323b 2876 clp->cl_rpcclient->cl_auth->au_ops->au_name,
1da177e4
LT		 2877 clp->cl_id_uniquifier);
2878 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
d4d3c507
CL		 2879 sizeof(setclientid.sc_netid),
2880 rpc_peeraddr2str(clp->cl_rpcclient,
2881 RPC_DISPLAY_NETID));
1da177e4 2882 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
d4d3c507 2883 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
1da177e4
LT		 2884 clp->cl_ipaddr, port >> 8, port & 255);
2885
2886 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2887 if (status != -NFS4ERR_CLID_INUSE)
2888 break;
2889 if (signalled())
2890 break;
2891 if (loop++ & 1)
2892 ssleep(clp->cl_lease_time + 1);
2893 else
2894 if (++clp->cl_id_uniquifier == 0)
2895 break;
2896 }
2897 return status;
2898}
2899
adfa6f98 2900static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2901{
2902 struct nfs_fsinfo fsinfo;
2903 struct rpc_message msg = {
2904 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2905 .rpc_argp = clp,
2906 .rpc_resp = &fsinfo,
286d7d6a 2907 .rpc_cred = cred,
1da177e4
LT		 2908 };
2909 unsigned long now;
2910 int status;
2911
2912 now = jiffies;
2913 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2914 if (status == 0) {
2915 spin_lock(&clp->cl_lock);
2916 clp->cl_lease_time = fsinfo.lease_time * HZ;
2917 clp->cl_last_renewal = now;
58d9714a 2918 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2919 spin_unlock(&clp->cl_lock);
2920 }
2921 return status;
2922}
2923
adfa6f98 2924int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2925{
2926 long timeout;
2927 int err;
2928 do {
2929 err = _nfs4_proc_setclientid_confirm(clp, cred);
2930 switch (err) {
2931 case 0:
2932 return err;
2933 case -NFS4ERR_RESOURCE:
2934 /* The IBM lawyers misread another document! */
2935 case -NFS4ERR_DELAY:
2936 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2937 }
2938 } while (err == 0);
2939 return err;
2940}
2941
fe650407
TM		 2942struct nfs4_delegreturndata {
2943 struct nfs4_delegreturnargs args;
fa178f29 2944 struct nfs4_delegreturnres res;
fe650407
TM		 2945 struct nfs_fh fh;
2946 nfs4_stateid stateid;
26e976a8 2947 unsigned long timestamp;
fa178f29 2948 struct nfs_fattr fattr;
fe650407
TM		 2949 int rpc_status;
2950};
2951
fe650407
TM		 2952static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2953{
2954 struct nfs4_delegreturndata *data = calldata;
2955 data->rpc_status = task->tk_status;
26e976a8 2956 if (data->rpc_status == 0)
fa178f29 2957 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2958}
2959
2960static void nfs4_delegreturn_release(void *calldata)
2961{
fe650407
TM		 2962 kfree(calldata);
2963}
2964
c8d149f3 2965static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 2966 .rpc_call_done = nfs4_delegreturn_done,
2967 .rpc_release = nfs4_delegreturn_release,
2968};
2969
e6f81075 2970static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
fe650407
TM		 2971{
2972 struct nfs4_delegreturndata *data;
fa178f29 2973 struct nfs_server *server = NFS_SERVER(inode);
fe650407 2974 struct rpc_task *task;
5138fde0
TM		 2975 struct rpc_message msg = {
2976 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2977 .rpc_cred = cred,
2978 };
c970aa85
TM		 2979 struct rpc_task_setup task_setup_data = {
2980 .rpc_client = server->client,
5138fde0 2981 .rpc_message = &msg,
c970aa85
TM		 2982 .callback_ops = &nfs4_delegreturn_ops,
2983 .flags = RPC_TASK_ASYNC,
2984 };
e6f81075 2985 int status = 0;
fe650407
TM		 2986
2987 data = kmalloc(sizeof(*data), GFP_KERNEL);
2988 if (data == NULL)
2989 return -ENOMEM;
2990 data->args.fhandle = &data->fh;
2991 data->args.stateid = &data->stateid;
fa178f29 2992 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 2993 nfs_copy_fh(&data->fh, NFS_FH(inode));
2994 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 2995 data->res.fattr = &data->fattr;
2996 data->res.server = server;
5138fde0 2997 nfs_fattr_init(data->res.fattr);
26e976a8 2998 data->timestamp = jiffies;
fe650407
TM		 2999 data->rpc_status = 0;
3000
c970aa85 3001 task_setup_data.callback_data = data;
5138fde0
TM		 3002 msg.rpc_argp = &data->args,
3003 msg.rpc_resp = &data->res,
c970aa85 3004 task = rpc_run_task(&task_setup_data);
7a1218a2 3005 if (IS_ERR(task))
fe650407 3006 return PTR_ERR(task);
e6f81075
TM		 3007 if (!issync)
3008 goto out;
fe650407 3009 status = nfs4_wait_for_completion_rpc_task(task);
e6f81075
TM		 3010 if (status != 0)
3011 goto out;
3012 status = data->rpc_status;
3013 if (status != 0)
3014 goto out;
3015 nfs_refresh_inode(inode, &data->fattr);
3016out:
e6b3c4db 3017 rpc_put_task(task);
fe650407 3018 return status;
1da177e4
LT		 3019}
3020
e6f81075 3021int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
1da177e4
LT		 3022{
3023 struct nfs_server *server = NFS_SERVER(inode);
3024 struct nfs4_exception exception = { };
3025 int err;
3026 do {
e6f81075 3027 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
1da177e4
LT		 3028 switch (err) {
3029 case -NFS4ERR_STALE_STATEID:
3030 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3031 case 0:
3032 return 0;
3033 }
3034 err = nfs4_handle_exception(server, err, &exception);
3035 } while (exception.retry);
3036 return err;
3037}
3038
3039#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3040#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3041
3042/*
3043 * sleep, with exponential backoff, and retry the LOCK operation.
3044 */
3045static unsigned long
3046nfs4_set_lock_task_retry(unsigned long timeout)
3047{
150030b7 3048 schedule_timeout_killable(timeout);
1da177e4
LT		 3049 timeout <<= 1;
3050 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3051 return NFS4_LOCK_MAXTIMEOUT;
3052 return timeout;
3053}
3054
1da177e4
LT		 3055static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3056{
3057 struct inode *inode = state->inode;
3058 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3059 struct nfs_client *clp = server->nfs_client;
911d1aaf 3060 struct nfs_lockt_args arg = {
1da177e4 3061 .fh = NFS_FH(inode),
911d1aaf 3062 .fl = request,
1da177e4 3063 };
911d1aaf
TM		 3064 struct nfs_lockt_res res = {
3065 .denied = request,
1da177e4
LT		 3066 };
3067 struct rpc_message msg = {
3068 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3069 .rpc_argp = &arg,
3070 .rpc_resp = &res,
3071 .rpc_cred = state->owner->so_cred,
3072 };
1da177e4
LT		 3073 struct nfs4_lock_state *lsp;
3074 int status;
3075
3076 down_read(&clp->cl_sem);
911d1aaf 3077 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3078 status = nfs4_set_lock_state(state, request);
3079 if (status != 0)
3080 goto out;
3081 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3082 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3083 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3084 switch (status) {
3085 case 0:
3086 request->fl_type = F_UNLCK;
3087 break;
3088 case -NFS4ERR_DENIED:
3089 status = 0;
1da177e4 3090 }
70cc6487 3091 request->fl_ops->fl_release_private(request);
8d0a8a9d 3092out:
1da177e4
LT		 3093 up_read(&clp->cl_sem);
3094 return status;
3095}
3096
3097static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3098{
3099 struct nfs4_exception exception = { };
3100 int err;
3101
3102 do {
3103 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3104 _nfs4_proc_getlk(state, cmd, request),
3105 &exception);
3106 } while (exception.retry);
3107 return err;
3108}
3109
3110static int do_vfs_lock(struct file *file, struct file_lock *fl)
3111{
3112 int res = 0;
3113 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3114 case FL_POSIX:
3115 res = posix_lock_file_wait(file, fl);
3116 break;
3117 case FL_FLOCK:
3118 res = flock_lock_file_wait(file, fl);
3119 break;
3120 default:
3121 BUG();
3122 }
1da177e4
LT		 3123 return res;
3124}
3125
faf5f49c 3126struct nfs4_unlockdata {
911d1aaf
TM		 3127 struct nfs_locku_args arg;
3128 struct nfs_locku_res res;
faf5f49c
TM		 3129 struct nfs4_lock_state *lsp;
3130 struct nfs_open_context *ctx;
911d1aaf
TM		 3131 struct file_lock fl;
3132 const struct nfs_server *server;
26e976a8 3133 unsigned long timestamp;
faf5f49c
TM		 3134};
3135
911d1aaf
TM		 3136static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3137 struct nfs_open_context *ctx,
3138 struct nfs4_lock_state *lsp,
3139 struct nfs_seqid *seqid)
3140{
3141 struct nfs4_unlockdata *p;
3142 struct inode *inode = lsp->ls_state->inode;
3143
3144 p = kmalloc(sizeof(*p), GFP_KERNEL);
3145 if (p == NULL)
3146 return NULL;
3147 p->arg.fh = NFS_FH(inode);
3148 p->arg.fl = &p->fl;
3149 p->arg.seqid = seqid;
c1d51931 3150 p->res.seqid = seqid;
911d1aaf
TM		 3151 p->arg.stateid = &lsp->ls_stateid;
3152 p->lsp = lsp;
3153 atomic_inc(&lsp->ls_count);
3154 /* Ensure we don't close file until we're done freeing locks! */
3155 p->ctx = get_nfs_open_context(ctx);
3156 memcpy(&p->fl, fl, sizeof(p->fl));
3157 p->server = NFS_SERVER(inode);
3158 return p;
3159}
3160
06f814a3 3161static void nfs4_locku_release_calldata(void *data)
faf5f49c 3162{
963d8fe5 3163 struct nfs4_unlockdata *calldata = data;
911d1aaf 3164 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3165 nfs4_put_lock_state(calldata->lsp);
3166 put_nfs_open_context(calldata->ctx);
3167 kfree(calldata);
faf5f49c
TM		 3168}
3169
963d8fe5 3170static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3171{
963d8fe5 3172 struct nfs4_unlockdata *calldata = data;
faf5f49c 3173
06f814a3
TM		 3174 if (RPC_ASSASSINATED(task))
3175 return;
faf5f49c
TM		 3176 switch (task->tk_status) {
3177 case 0:
3178 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3179 calldata->res.stateid.data,
faf5f49c 3180 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3181 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3182 break;
3183 case -NFS4ERR_STALE_STATEID:
3184 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3185 break;
3186 default:
a6a352e9 3187 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3188 rpc_restart_call(task);
faf5f49c 3189 }
faf5f49c
TM		 3190}
3191
4ce70ada 3192static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3193{
4ce70ada 3194 struct nfs4_unlockdata *calldata = data;
faf5f49c 3195
911d1aaf 3196 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3197 return;
3198 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3199 /* Note: exit _without_ running nfs4_locku_done */
3200 task->tk_action = NULL;
faf5f49c
TM		 3201 return;
3202 }
26e976a8 3203 calldata->timestamp = jiffies;
5138fde0 3204 rpc_call_start(task);
faf5f49c
TM		 3205}
3206
963d8fe5 3207static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3208 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3209 .rpc_call_done = nfs4_locku_done,
06f814a3 3210 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3211};
3212
a5d16a4d
TM		 3213static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3214 struct nfs_open_context *ctx,
3215 struct nfs4_lock_state *lsp,
3216 struct nfs_seqid *seqid)
3217{
3218 struct nfs4_unlockdata *data;
5138fde0
TM		 3219 struct rpc_message msg = {
3220 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3221 .rpc_cred = ctx->cred,
3222 };
c970aa85
TM		 3223 struct rpc_task_setup task_setup_data = {
3224 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5138fde0 3225 .rpc_message = &msg,
c970aa85 3226 .callback_ops = &nfs4_locku_ops,
101070ca 3227 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3228 .flags = RPC_TASK_ASYNC,
3229 };
a5d16a4d 3230
137d6aca
FF		 3231 /* Ensure this is an unlock - when canceling a lock, the
3232 * canceled lock is passed in, and it won't be an unlock.
3233 */
3234 fl->fl_type = F_UNLCK;
3235
a5d16a4d
TM		 3236 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3237 if (data == NULL) {
3238 nfs_free_seqid(seqid);
3239 return ERR_PTR(-ENOMEM);
3240 }
3241
5138fde0
TM		 3242 msg.rpc_argp = &data->arg,
3243 msg.rpc_resp = &data->res,
c970aa85
TM		 3244 task_setup_data.callback_data = data;
3245 return rpc_run_task(&task_setup_data);
a5d16a4d
TM		 3246}
3247
faf5f49c
TM		 3248static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3249{
911d1aaf 3250 struct nfs_seqid *seqid;
1da177e4 3251 struct nfs4_lock_state *lsp;
06f814a3
TM		 3252 struct rpc_task *task;
3253 int status = 0;
536ff0f8 3254 unsigned char fl_flags = request->fl_flags;
faf5f49c 3255
8d0a8a9d 3256 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3257 /* Unlock _before_ we do the RPC call */
3258 request->fl_flags |= FL_EXISTS;
3259 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3260 goto out;
8d0a8a9d 3261 if (status != 0)
9b073574
TM		 3262 goto out;
3263 /* Is this a delegated lock? */
3264 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3265 goto out;
8d0a8a9d 3266 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3267 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3268 status = -ENOMEM;
911d1aaf 3269 if (seqid == NULL)
9b073574 3270 goto out;
cd3758e3 3271 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3272 status = PTR_ERR(task);
3273 if (IS_ERR(task))
9b073574 3274 goto out;
a5d16a4d 3275 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3276 rpc_put_task(task);
9b073574 3277out:
536ff0f8 3278 request->fl_flags = fl_flags;
1da177e4
LT		 3279 return status;
3280}
3281
a5d16a4d
TM		 3282struct nfs4_lockdata {
3283 struct nfs_lock_args arg;
3284 struct nfs_lock_res res;
3285 struct nfs4_lock_state *lsp;
3286 struct nfs_open_context *ctx;
3287 struct file_lock fl;
26e976a8 3288 unsigned long timestamp;
a5d16a4d
TM		 3289 int rpc_status;
3290 int cancelled;
3291};
3292
3293static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3294 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3295{
a5d16a4d
TM		 3296 struct nfs4_lockdata *p;
3297 struct inode *inode = lsp->ls_state->inode;
1da177e4 3298 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3299
3300 p = kzalloc(sizeof(*p), GFP_KERNEL);
3301 if (p == NULL)
3302 return NULL;
3303
3304 p->arg.fh = NFS_FH(inode);
3305 p->arg.fl = &p->fl;
2f74c0a0
TM		 3306 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3307 if (p->arg.open_seqid == NULL)
3308 goto out_free;
a5d16a4d
TM		 3309 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3310 if (p->arg.lock_seqid == NULL)
2f74c0a0 3311 goto out_free_seqid;
a5d16a4d 3312 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3313 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3314 p->arg.lock_owner.id = lsp->ls_id.id;
c1d51931 3315 p->res.lock_seqid = p->arg.lock_seqid;
a5d16a4d
TM		 3316 p->lsp = lsp;
3317 atomic_inc(&lsp->ls_count);
3318 p->ctx = get_nfs_open_context(ctx);
3319 memcpy(&p->fl, fl, sizeof(p->fl));
3320 return p;
2f74c0a0
TM		 3321out_free_seqid:
3322 nfs_free_seqid(p->arg.open_seqid);
a5d16a4d
TM		 3323out_free:
3324 kfree(p);
3325 return NULL;
3326}
3327
3328static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3329{
3330 struct nfs4_lockdata *data = calldata;
3331 struct nfs4_state *state = data->lsp->ls_state;
06735b34 3332
3110ff80 3333 dprintk("%s: begin!\n", __func__);
2f74c0a0
TM		 3334 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3335 return;
a5d16a4d
TM		 3336 /* Do we need to do an open_to_lock_owner? */
3337 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
e6e21970
TM		 3338 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3339 return;
a5d16a4d
TM		 3340 data->arg.open_stateid = &state->stateid;
3341 data->arg.new_lock_owner = 1;
c1d51931 3342 data->res.open_seqid = data->arg.open_seqid;
2f74c0a0
TM		 3343 } else
3344 data->arg.new_lock_owner = 0;
26e976a8 3345 data->timestamp = jiffies;
5138fde0 3346 rpc_call_start(task);
3110ff80 3347 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
a5d16a4d
TM		 3348}
3349
3350static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3351{
3352 struct nfs4_lockdata *data = calldata;
3353
3110ff80 3354 dprintk("%s: begin!\n", __func__);
a5d16a4d
TM		 3355
3356 data->rpc_status = task->tk_status;
3357 if (RPC_ASSASSINATED(task))
3358 goto out;
3359 if (data->arg.new_lock_owner != 0) {
a5d16a4d
TM		 3360 if (data->rpc_status == 0)
3361 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3362 else
3363 goto out;
3364 }
3365 if (data->rpc_status == 0) {
3366 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3367 sizeof(data->lsp->ls_stateid.data));
3368 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3369 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d 3370 }
a5d16a4d 3371out:
3110ff80 3372 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
a5d16a4d
TM		 3373}
3374
3375static void nfs4_lock_release(void *calldata)
3376{
3377 struct nfs4_lockdata *data = calldata;
3378
3110ff80 3379 dprintk("%s: begin!\n", __func__);
2f74c0a0 3380 nfs_free_seqid(data->arg.open_seqid);
a5d16a4d
TM		 3381 if (data->cancelled != 0) {
3382 struct rpc_task *task;
3383 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3384 data->arg.lock_seqid);
3385 if (!IS_ERR(task))
e6b3c4db 3386 rpc_put_task(task);
3110ff80 3387 dprintk("%s: cancelling lock!\n", __func__);
a5d16a4d
TM		 3388 } else
3389 nfs_free_seqid(data->arg.lock_seqid);
3390 nfs4_put_lock_state(data->lsp);
3391 put_nfs_open_context(data->ctx);
3392 kfree(data);
3110ff80 3393 dprintk("%s: done!\n", __func__);
a5d16a4d
TM		 3394}
3395
3396static const struct rpc_call_ops nfs4_lock_ops = {
3397 .rpc_call_prepare = nfs4_lock_prepare,
3398 .rpc_call_done = nfs4_lock_done,
3399 .rpc_release = nfs4_lock_release,
3400};
3401
3402static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3403{
3404 struct nfs4_lockdata *data;
3405 struct rpc_task *task;
5138fde0
TM		 3406 struct rpc_message msg = {
3407 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3408 .rpc_cred = state->owner->so_cred,
3409 };
c970aa85
TM		 3410 struct rpc_task_setup task_setup_data = {
3411 .rpc_client = NFS_CLIENT(state->inode),
5138fde0 3412 .rpc_message = &msg,
c970aa85 3413 .callback_ops = &nfs4_lock_ops,
101070ca 3414 .workqueue = nfsiod_workqueue,
c970aa85
TM		 3415 .flags = RPC_TASK_ASYNC,
3416 };
a5d16a4d
TM		 3417 int ret;
3418
3110ff80 3419 dprintk("%s: begin!\n", __func__);
cd3758e3 3420 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3421 fl->fl_u.nfs4_fl.owner);
3422 if (data == NULL)
3423 return -ENOMEM;
3424 if (IS_SETLKW(cmd))
3425 data->arg.block = 1;
3426 if (reclaim != 0)
3427 data->arg.reclaim = 1;
5138fde0
TM		 3428 msg.rpc_argp = &data->arg,
3429 msg.rpc_resp = &data->res,
c970aa85
TM		 3430 task_setup_data.callback_data = data;
3431 task = rpc_run_task(&task_setup_data);
7a1218a2 3432 if (IS_ERR(task))
a5d16a4d 3433 return PTR_ERR(task);
a5d16a4d
TM		 3434 ret = nfs4_wait_for_completion_rpc_task(task);
3435 if (ret == 0) {
3436 ret = data->rpc_status;
3437 if (ret == -NFS4ERR_DENIED)
3438 ret = -EAGAIN;
3439 } else
3440 data->cancelled = 1;
e6b3c4db 3441 rpc_put_task(task);
3110ff80 3442 dprintk("%s: done, ret = %d!\n", __func__, ret);
a5d16a4d 3443 return ret;
1da177e4
LT		 3444}
3445
3446static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3447{
202b50dc
TM		 3448 struct nfs_server *server = NFS_SERVER(state->inode);
3449 struct nfs4_exception exception = { };
3450 int err;
3451
3452 do {
42a2d13e
TM		 3453 /* Cache the lock if possible... */
3454 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3455 return 0;
202b50dc
TM		 3456 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3457 if (err != -NFS4ERR_DELAY)
3458 break;
3459 nfs4_handle_exception(server, err, &exception);
3460 } while (exception.retry);
3461 return err;
1da177e4
LT		 3462}
3463
3464static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3465{
202b50dc
TM		 3466 struct nfs_server *server = NFS_SERVER(state->inode);
3467 struct nfs4_exception exception = { };
3468 int err;
3469
6bfc93ef
TM		 3470 err = nfs4_set_lock_state(state, request);
3471 if (err != 0)
3472 return err;
202b50dc 3473 do {
42a2d13e
TM		 3474 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3475 return 0;
202b50dc
TM		 3476 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3477 if (err != -NFS4ERR_DELAY)
3478 break;
3479 nfs4_handle_exception(server, err, &exception);
3480 } while (exception.retry);
3481 return err;
1da177e4
LT		 3482}
3483
3484static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3485{
adfa6f98 3486 struct nfs_client *clp = state->owner->so_client;
01c3b861 3487 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3488 int status;
3489
6bfc93ef 3490 /* Is this a delegated open? */
6bfc93ef
TM		 3491 status = nfs4_set_lock_state(state, request);
3492 if (status != 0)
3493 goto out;
01c3b861
TM		 3494 request->fl_flags |= FL_ACCESS;
3495 status = do_vfs_lock(request->fl_file, request);
3496 if (status < 0)
3497 goto out;
3498 down_read(&clp->cl_sem);
3499 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3500 struct nfs_inode *nfsi = NFS_I(state->inode);
3501 /* Yes: cache locks! */
3502 down_read(&nfsi->rwsem);
3503 /* ...but avoid races with delegation recall... */
3504 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3505 request->fl_flags = fl_flags & ~FL_SLEEP;
3506 status = do_vfs_lock(request->fl_file, request);
3507 up_read(&nfsi->rwsem);
3508 goto out_unlock;
3509 }
3510 up_read(&nfsi->rwsem);
3511 }
6bfc93ef
TM		 3512 status = _nfs4_do_setlk(state, cmd, request, 0);
3513 if (status != 0)
01c3b861 3514 goto out_unlock;
6bfc93ef 3515 /* Note: we always want to sleep here! */
01c3b861 3516 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef 3517 if (do_vfs_lock(request->fl_file, request) < 0)
3110ff80 3518 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
01c3b861 3519out_unlock:
1da177e4 3520 up_read(&clp->cl_sem);
01c3b861
TM		 3521out:
3522 request->fl_flags = fl_flags;
1da177e4
LT		 3523 return status;
3524}
3525
3526static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3527{
3528 struct nfs4_exception exception = { };
3529 int err;
3530
3531 do {
3532 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3533 _nfs4_proc_setlk(state, cmd, request),
3534 &exception);
3535 } while (exception.retry);
3536 return err;
3537}
3538
3539static int
3540nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3541{
3542 struct nfs_open_context *ctx;
3543 struct nfs4_state *state;
3544 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3545 int status;
3546
3547 /* verify open state */
cd3758e3 3548 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3549 state = ctx->state;
3550
3551 if (request->fl_start < 0 || request->fl_end < 0)
3552 return -EINVAL;
3553
3554 if (IS_GETLK(cmd))
3555 return nfs4_proc_getlk(state, F_GETLK, request);
3556
3557 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3558 return -EINVAL;
3559
3560 if (request->fl_type == F_UNLCK)
3561 return nfs4_proc_unlck(state, cmd, request);
3562
3563 do {
3564 status = nfs4_proc_setlk(state, cmd, request);
3565 if ((status != -EAGAIN) || IS_SETLK(cmd))
3566 break;
3567 timeout = nfs4_set_lock_task_retry(timeout);
3568 status = -ERESTARTSYS;
3569 if (signalled())
3570 break;
3571 } while(status < 0);
1da177e4
LT		 3572 return status;
3573}
3574
888e694c
TM		 3575int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3576{
3577 struct nfs_server *server = NFS_SERVER(state->inode);
3578 struct nfs4_exception exception = { };
3579 int err;
3580
3581 err = nfs4_set_lock_state(state, fl);
3582 if (err != 0)
3583 goto out;
3584 do {
3585 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3586 if (err != -NFS4ERR_DELAY)
3587 break;
3588 err = nfs4_handle_exception(server, err, &exception);
3589 } while (exception.retry);
3590out:
3591 return err;
3592}
6b3b5496 3593
aa1870af
BF		 3594#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3595
6b3b5496
BF		 3596int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3597 size_t buflen, int flags)
3598{
4b580ee3
BF		 3599 struct inode *inode = dentry->d_inode;
3600
3601 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3602 return -EOPNOTSUPP;
3603
4b580ee3 3604 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3605}
3606
3607/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3608 * and that's what we'll do for e.g. user attributes that haven't been set.
3609 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3610 * attributes in kernel-managed attribute namespaces. */
3611ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3612 size_t buflen)
3613{
aa1870af
BF		 3614 struct inode *inode = dentry->d_inode;
3615
3616 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3617 return -EOPNOTSUPP;
3618
3619 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3620}
3621
3622ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3623{
aa1870af 3624 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3625
096455a2
BF		 3626 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3627 return 0;
6b3b5496
BF		 3628 if (buf && buflen < len)
3629 return -ERANGE;
3630 if (buf)
aa1870af
BF		 3631 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3632 return len;
6b3b5496
BF		 3633}
3634
56659e99 3635int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3636 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3637{
3638 struct nfs_server *server = NFS_SERVER(dir);
3639 u32 bitmask[2] = {
361e624f
MN		 3640 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3641 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3642 };
3643 struct nfs4_fs_locations_arg args = {
3644 .dir_fh = NFS_FH(dir),
c228fd3a 3645 .name = name,
683b57b4
TM		 3646 .page = page,
3647 .bitmask = bitmask,
3648 };
3649 struct rpc_message msg = {
3650 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3651 .rpc_argp = &args,
7aaa0b3b 3652 .rpc_resp = fs_locations,
683b57b4
TM		 3653 };
3654 int status;
3655
3110ff80 3656 dprintk("%s: start\n", __func__);
c228fd3a 3657 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3658 fs_locations->server = server;
830b8e33 3659 fs_locations->nlocations = 0;
683b57b4 3660 status = rpc_call_sync(server->client, &msg, 0);
3110ff80 3661 dprintk("%s: returned status = %d\n", __func__, status);
683b57b4
TM		 3662 return status;
3663}
3664
1da177e4
LT		 3665struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3666 .recover_open = nfs4_open_reclaim,
3667 .recover_lock = nfs4_lock_reclaim,
3668};
3669
3670struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3671 .recover_open = nfs4_open_expired,
3672 .recover_lock = nfs4_lock_expired,
3673};
3674
92e1d5be 3675static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3676 .permission = nfs_permission,
3677 .getattr = nfs_getattr,
3678 .setattr = nfs_setattr,
3679 .getxattr = nfs4_getxattr,
3680 .setxattr = nfs4_setxattr,
3681 .listxattr = nfs4_listxattr,
3682};
3683
509de811 3684const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3685 .version = 4, /* protocol version */
3686 .dentry_ops = &nfs4_dentry_operations,
3687 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3688 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3689 .getroot = nfs4_proc_get_root,
3690 .getattr = nfs4_proc_getattr,
3691 .setattr = nfs4_proc_setattr,
2b3de441 3692 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3693 .lookup = nfs4_proc_lookup,
3694 .access = nfs4_proc_access,
3695 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3696 .create = nfs4_proc_create,
3697 .remove = nfs4_proc_remove,
3698 .unlink_setup = nfs4_proc_unlink_setup,
3699 .unlink_done = nfs4_proc_unlink_done,
3700 .rename = nfs4_proc_rename,
3701 .link = nfs4_proc_link,
3702 .symlink = nfs4_proc_symlink,
3703 .mkdir = nfs4_proc_mkdir,
3704 .rmdir = nfs4_proc_remove,
3705 .readdir = nfs4_proc_readdir,
3706 .mknod = nfs4_proc_mknod,
3707 .statfs = nfs4_proc_statfs,
3708 .fsinfo = nfs4_proc_fsinfo,
3709 .pathconf = nfs4_proc_pathconf,
e9326dca 3710 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3711 .decode_dirent = nfs4_decode_dirent,
3712 .read_setup = nfs4_proc_read_setup,
ec06c096 3713 .read_done = nfs4_read_done,
1da177e4 3714 .write_setup = nfs4_proc_write_setup,
788e7a89 3715 .write_done = nfs4_write_done,
1da177e4 3716 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3717 .commit_done = nfs4_commit_done,
02a913a7
TM		 3718 .file_open = nfs_open,
3719 .file_release = nfs_release,
1da177e4 3720 .lock = nfs4_proc_lock,
e50a1c2e 3721 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3722};
3723
3724/*
3725 * Local variables:
3726 * c-basic-offset: 8
3727 * End:
3728 */
Linux 6.x block layer and io_uring tree(s)