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NFSv4: Don't call OPEN if we already have an open stateid for a file
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
006ea73e 54#include "iostat.h"
1da177e4
LT		 55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
2066fe89 58#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
cdd4e68b 61struct nfs4_opendata;
864472e9 62static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
1da177e4 65static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
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);
aac00a8d 68static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags);
1da177e4 69
1da177e4
LT		 70/* Prevent leaks of NFSv4 errors into userland */
71int nfs4_map_errors(int err)
72{
73 if (err < -1000) {
74 dprintk("%s could not handle NFSv4 error %d\n",
75 __FUNCTION__, -err);
76 return -EIO;
77 }
78 return err;
79}
80
81/*
82 * This is our standard bitmap for GETATTR requests.
83 */
84const u32 nfs4_fattr_bitmap[2] = {
85 FATTR4_WORD0_TYPE
86 | FATTR4_WORD0_CHANGE
87 | FATTR4_WORD0_SIZE
88 | FATTR4_WORD0_FSID
89 | FATTR4_WORD0_FILEID,
90 FATTR4_WORD1_MODE
91 | FATTR4_WORD1_NUMLINKS
92 | FATTR4_WORD1_OWNER
93 | FATTR4_WORD1_OWNER_GROUP
94 | FATTR4_WORD1_RAWDEV
95 | FATTR4_WORD1_SPACE_USED
96 | FATTR4_WORD1_TIME_ACCESS
97 | FATTR4_WORD1_TIME_METADATA
98 | FATTR4_WORD1_TIME_MODIFY
99};
100
101const u32 nfs4_statfs_bitmap[2] = {
102 FATTR4_WORD0_FILES_AVAIL
103 | FATTR4_WORD0_FILES_FREE
104 | FATTR4_WORD0_FILES_TOTAL,
105 FATTR4_WORD1_SPACE_AVAIL
106 | FATTR4_WORD1_SPACE_FREE
107 | FATTR4_WORD1_SPACE_TOTAL
108};
109
4ce79717 110const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 111 FATTR4_WORD0_MAXLINK
112 | FATTR4_WORD0_MAXNAME,
113 0
114};
115
116const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
117 | FATTR4_WORD0_MAXREAD
118 | FATTR4_WORD0_MAXWRITE
119 | FATTR4_WORD0_LEASE_TIME,
120 0
121};
122
830b8e33
MN		 123const u32 nfs4_fs_locations_bitmap[2] = {
124 FATTR4_WORD0_TYPE
125 | FATTR4_WORD0_CHANGE
126 | FATTR4_WORD0_SIZE
127 | FATTR4_WORD0_FSID
128 | FATTR4_WORD0_FILEID
129 | FATTR4_WORD0_FS_LOCATIONS,
130 FATTR4_WORD1_MODE
131 | FATTR4_WORD1_NUMLINKS
132 | FATTR4_WORD1_OWNER
133 | FATTR4_WORD1_OWNER_GROUP
134 | FATTR4_WORD1_RAWDEV
135 | FATTR4_WORD1_SPACE_USED
136 | FATTR4_WORD1_TIME_ACCESS
137 | FATTR4_WORD1_TIME_METADATA
138 | FATTR4_WORD1_TIME_MODIFY
139 | FATTR4_WORD1_MOUNTED_ON_FILEID
140};
141
bc4785cd 142static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 143 struct nfs4_readdir_arg *readdir)
144{
0dbb4c67 145 __be32 *start, *p;
1da177e4
LT		 146
147 BUG_ON(readdir->count < 80);
148 if (cookie > 2) {
b7ef1956 149 readdir->cookie = cookie;
1da177e4
LT		 150 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
151 return;
152 }
153
154 readdir->cookie = 0;
155 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
156 if (cookie == 2)
157 return;
158
159 /*
160 * NFSv4 servers do not return entries for '.' and '..'
161 * Therefore, we fake these entries here. We let '.'
162 * have cookie 0 and '..' have cookie 1. Note that
163 * when talking to the server, we always send cookie 0
164 * instead of 1 or 2.
165 */
0dbb4c67 166 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 167
168 if (cookie == 0) {
169 *p++ = xdr_one; /* next */
170 *p++ = xdr_zero; /* cookie, first word */
171 *p++ = xdr_one; /* cookie, second word */
172 *p++ = xdr_one; /* entry len */
173 memcpy(p, ".\0\0\0", 4); /* entry */
174 p++;
175 *p++ = xdr_one; /* bitmap length */
176 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
177 *p++ = htonl(8); /* attribute buffer length */
178 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
179 }
180
181 *p++ = xdr_one; /* next */
182 *p++ = xdr_zero; /* cookie, first word */
183 *p++ = xdr_two; /* cookie, second word */
184 *p++ = xdr_two; /* entry len */
185 memcpy(p, "..\0\0", 4); /* entry */
186 p++;
187 *p++ = xdr_one; /* bitmap length */
188 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
189 *p++ = htonl(8); /* attribute buffer length */
190 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
191
192 readdir->pgbase = (char *)p - (char *)start;
193 readdir->count -= readdir->pgbase;
194 kunmap_atomic(start, KM_USER0);
195}
196
26e976a8 197static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 198{
7539bbab 199 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 200 spin_lock(&clp->cl_lock);
201 if (time_before(clp->cl_last_renewal,timestamp))
202 clp->cl_last_renewal = timestamp;
203 spin_unlock(&clp->cl_lock);
204}
205
38478b24 206static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 207{
38478b24 208 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 209
38478b24
TM		 210 spin_lock(&dir->i_lock);
211 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
1da177e4
LT		 212 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
213 nfsi->change_attr = cinfo->after;
38478b24 214 spin_unlock(&dir->i_lock);
1da177e4
LT		 215}
216
e56e0b78 217struct nfs4_opendata {
c6d00e63 218 struct kref kref;
e56e0b78
TM		 219 struct nfs_openargs o_arg;
220 struct nfs_openres o_res;
cdd4e68b
TM		 221 struct nfs_open_confirmargs c_arg;
222 struct nfs_open_confirmres c_res;
e56e0b78
TM		 223 struct nfs_fattr f_attr;
224 struct nfs_fattr dir_attr;
ad389da7 225 struct path path;
e56e0b78
TM		 226 struct dentry *dir;
227 struct nfs4_state_owner *owner;
aac00a8d 228 struct nfs4_state *state;
e56e0b78 229 struct iattr attrs;
26e976a8 230 unsigned long timestamp;
3e309914 231 unsigned int rpc_done : 1;
24ac23ab
TM		 232 int rpc_status;
233 int cancelled;
e56e0b78
TM		 234};
235
2ced46c2
TM		 236
237static void nfs4_init_opendata_res(struct nfs4_opendata *p)
238{
239 p->o_res.f_attr = &p->f_attr;
240 p->o_res.dir_attr = &p->dir_attr;
241 p->o_res.server = p->o_arg.server;
242 nfs_fattr_init(&p->f_attr);
243 nfs_fattr_init(&p->dir_attr);
244}
245
ad389da7 246static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
e56e0b78
TM		 247 struct nfs4_state_owner *sp, int flags,
248 const struct iattr *attrs)
249{
ad389da7 250 struct dentry *parent = dget_parent(path->dentry);
e56e0b78
TM		 251 struct inode *dir = parent->d_inode;
252 struct nfs_server *server = NFS_SERVER(dir);
253 struct nfs4_opendata *p;
254
255 p = kzalloc(sizeof(*p), GFP_KERNEL);
256 if (p == NULL)
257 goto err;
258 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
259 if (p->o_arg.seqid == NULL)
260 goto err_free;
ad389da7
TM		 261 p->path.mnt = mntget(path->mnt);
262 p->path.dentry = dget(path->dentry);
e56e0b78
TM		 263 p->dir = parent;
264 p->owner = sp;
265 atomic_inc(&sp->so_count);
266 p->o_arg.fh = NFS_FH(dir);
267 p->o_arg.open_flags = flags,
7539bbab 268 p->o_arg.clientid = server->nfs_client->cl_clientid;
9f958ab8 269 p->o_arg.id = sp->so_owner_id.id;
ad389da7 270 p->o_arg.name = &p->path.dentry->d_name;
e56e0b78
TM		 271 p->o_arg.server = server;
272 p->o_arg.bitmask = server->attr_bitmask;
273 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
e56e0b78
TM		 274 if (flags & O_EXCL) {
275 u32 *s = (u32 *) p->o_arg.u.verifier.data;
276 s[0] = jiffies;
277 s[1] = current->pid;
278 } else if (flags & O_CREAT) {
279 p->o_arg.u.attrs = &p->attrs;
280 memcpy(&p->attrs, attrs, sizeof(p->attrs));
281 }
cdd4e68b
TM		 282 p->c_arg.fh = &p->o_res.fh;
283 p->c_arg.stateid = &p->o_res.stateid;
284 p->c_arg.seqid = p->o_arg.seqid;
2ced46c2 285 nfs4_init_opendata_res(p);
c6d00e63 286 kref_init(&p->kref);
e56e0b78
TM		 287 return p;
288err_free:
289 kfree(p);
290err:
291 dput(parent);
292 return NULL;
293}
294
c6d00e63 295static void nfs4_opendata_free(struct kref *kref)
e56e0b78 296{
c6d00e63
TM		 297 struct nfs4_opendata *p = container_of(kref,
298 struct nfs4_opendata, kref);
299
300 nfs_free_seqid(p->o_arg.seqid);
aac00a8d
TM		 301 if (p->state != NULL)
302 nfs4_put_open_state(p->state);
c6d00e63
TM		 303 nfs4_put_state_owner(p->owner);
304 dput(p->dir);
305 dput(p->path.dentry);
306 mntput(p->path.mnt);
307 kfree(p);
308}
309
310static void nfs4_opendata_put(struct nfs4_opendata *p)
311{
312 if (p != NULL)
313 kref_put(&p->kref, nfs4_opendata_free);
e56e0b78
TM		 314}
315
06f814a3
TM		 316static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
317{
318 sigset_t oldset;
319 int ret;
320
321 rpc_clnt_sigmask(task->tk_client, &oldset);
322 ret = rpc_wait_for_completion_task(task);
323 rpc_clnt_sigunmask(task->tk_client, &oldset);
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;
333 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
334 break;
335 case FMODE_WRITE:
336 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
337 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
338 break;
339 case FMODE_READ|FMODE_WRITE:
340 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
341 }
342 return ret;
343}
344
aac00a8d
TM		 345static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
346{
347 if ((delegation->type & open_flags) != open_flags)
348 return 0;
349 if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
350 return 0;
351 return 1;
352}
353
003707c7 354static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
e7616923
TM		 355{
356 switch (open_flags) {
357 case FMODE_WRITE:
358 state->n_wronly++;
359 break;
360 case FMODE_READ:
361 state->n_rdonly++;
362 break;
363 case FMODE_READ|FMODE_WRITE:
364 state->n_rdwr++;
365 }
003707c7
TM		 366 nfs4_state_set_mode_locked(state, state->state | open_flags);
367}
368
369static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
370{
371 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
372 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
373 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
374 switch (open_flags) {
375 case FMODE_READ:
376 set_bit(NFS_O_RDONLY_STATE, &state->flags);
377 break;
378 case FMODE_WRITE:
379 set_bit(NFS_O_WRONLY_STATE, &state->flags);
380 break;
381 case FMODE_READ|FMODE_WRITE:
382 set_bit(NFS_O_RDWR_STATE, &state->flags);
383 }
e7616923
TM		 384}
385
003707c7
TM		 386static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
387{
388 spin_lock(&state->owner->so_lock);
389 spin_lock(&state->inode->i_lock);
390 nfs_set_open_stateid_locked(state, stateid, open_flags);
391 spin_unlock(&state->inode->i_lock);
392 spin_unlock(&state->owner->so_lock);
393}
394
395static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
1da177e4
LT		 396{
397 struct inode *inode = state->inode;
398
399 open_flags &= (FMODE_READ|FMODE_WRITE);
d530838b 400 /* Protect against nfs4_find_state_byowner() */
ec073428 401 spin_lock(&state->owner->so_lock);
1da177e4 402 spin_lock(&inode->i_lock);
003707c7
TM		 403 if (deleg_stateid != NULL) {
404 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
405 set_bit(NFS_DELEGATED_STATE, &state->flags);
406 }
407 if (open_stateid != NULL)
408 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
e7616923 409 update_open_stateflags(state, open_flags);
1da177e4 410 spin_unlock(&inode->i_lock);
ec073428 411 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 412}
413
aac00a8d
TM		 414static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
415{
416 struct nfs_delegation *delegation;
417
418 rcu_read_lock();
419 delegation = rcu_dereference(NFS_I(inode)->delegation);
420 if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
421 rcu_read_unlock();
422 return;
423 }
424 rcu_read_unlock();
425 nfs_inode_return_delegation(inode);
426}
427
6ee41268 428static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
aac00a8d
TM		 429{
430 struct nfs4_state *state = opendata->state;
431 struct nfs_inode *nfsi = NFS_I(state->inode);
432 struct nfs_delegation *delegation;
433 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
434 nfs4_stateid stateid;
435 int ret = -EAGAIN;
436
437 rcu_read_lock();
438 delegation = rcu_dereference(nfsi->delegation);
aac00a8d 439 for (;;) {
6ee41268
TM		 440 if (can_open_cached(state, open_mode)) {
441 spin_lock(&state->owner->so_lock);
442 if (can_open_cached(state, open_mode)) {
443 update_open_stateflags(state, open_mode);
444 spin_unlock(&state->owner->so_lock);
445 rcu_read_unlock();
446 goto out_return_state;
447 }
448 spin_unlock(&state->owner->so_lock);
449 }
450 if (delegation == NULL)
451 break;
aac00a8d
TM		 452 if (!can_open_delegated(delegation, open_mode))
453 break;
454 /* Save the delegation */
455 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
456 rcu_read_unlock();
457 lock_kernel();
458 ret = _nfs4_do_access(state->inode, state->owner->so_cred, open_mode);
459 unlock_kernel();
460 if (ret != 0)
461 goto out;
462 ret = -EAGAIN;
463 rcu_read_lock();
464 delegation = rcu_dereference(nfsi->delegation);
6ee41268 465 /* If no delegation, try a cached open */
aac00a8d 466 if (delegation == NULL)
6ee41268 467 continue;
aac00a8d
TM		 468 /* Is the delegation still valid? */
469 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
470 continue;
471 rcu_read_unlock();
472 update_open_stateid(state, NULL, &stateid, open_mode);
473 goto out_return_state;
474 }
aac00a8d
TM		 475 rcu_read_unlock();
476out:
477 return ERR_PTR(ret);
478out_return_state:
479 atomic_inc(&state->count);
480 return state;
481}
482
24ac23ab
TM		 483static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
484{
485 struct inode *inode;
486 struct nfs4_state *state = NULL;
003707c7
TM		 487 struct nfs_delegation *delegation;
488 nfs4_stateid *deleg_stateid = NULL;
1b370bc2 489 int ret;
24ac23ab 490
aac00a8d 491 if (!data->rpc_done) {
6ee41268 492 state = nfs4_try_open_cached(data);
aac00a8d
TM		 493 goto out;
494 }
495
1b370bc2 496 ret = -EAGAIN;
24ac23ab 497 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1b370bc2 498 goto err;
24ac23ab 499 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1b370bc2 500 ret = PTR_ERR(inode);
03f28e3a 501 if (IS_ERR(inode))
1b370bc2
TM		 502 goto err;
503 ret = -ENOMEM;
24ac23ab
TM		 504 state = nfs4_get_open_state(inode, data->owner);
505 if (state == NULL)
1b370bc2 506 goto err_put_inode;
549d6ed5 507 if (data->o_res.delegation_type != 0) {
549d6ed5
TM		 508 int delegation_flags = 0;
509
003707c7
TM		 510 rcu_read_lock();
511 delegation = rcu_dereference(NFS_I(inode)->delegation);
512 if (delegation)
513 delegation_flags = delegation->flags;
514 rcu_read_unlock();
549d6ed5
TM		 515 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
516 nfs_inode_set_delegation(state->inode,
517 data->owner->so_cred,
518 &data->o_res);
519 else
520 nfs_inode_reclaim_delegation(state->inode,
521 data->owner->so_cred,
522 &data->o_res);
523 }
003707c7
TM		 524 rcu_read_lock();
525 delegation = rcu_dereference(NFS_I(inode)->delegation);
526 if (delegation != NULL)
527 deleg_stateid = &delegation->stateid;
528 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
529 rcu_read_unlock();
24ac23ab 530 iput(inode);
aac00a8d 531out:
24ac23ab 532 return state;
1b370bc2
TM		 533err_put_inode:
534 iput(inode);
535err:
536 return ERR_PTR(ret);
24ac23ab
TM		 537}
538
864472e9
TM		 539static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
540{
541 struct nfs_inode *nfsi = NFS_I(state->inode);
542 struct nfs_open_context *ctx;
543
544 spin_lock(&state->inode->i_lock);
545 list_for_each_entry(ctx, &nfsi->open_files, list) {
546 if (ctx->state != state)
547 continue;
548 get_nfs_open_context(ctx);
549 spin_unlock(&state->inode->i_lock);
550 return ctx;
551 }
552 spin_unlock(&state->inode->i_lock);
553 return ERR_PTR(-ENOENT);
554}
555
2ced46c2 556static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
864472e9 557{
2ced46c2 558 struct nfs4_state *newstate;
864472e9
TM		 559 int ret;
560
561 opendata->o_arg.open_flags = openflags;
2ced46c2
TM		 562 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
563 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
564 nfs4_init_opendata_res(opendata);
864472e9
TM		 565 ret = _nfs4_proc_open(opendata);
566 if (ret != 0)
567 return ret;
2ced46c2 568 newstate = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 569 if (IS_ERR(newstate))
570 return PTR_ERR(newstate);
571 nfs4_close_state(&opendata->path, newstate, openflags);
2ced46c2 572 *res = newstate;
864472e9
TM		 573 return 0;
574}
575
576static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
577{
864472e9 578 struct nfs4_state *newstate;
864472e9
TM		 579 int ret;
580
581 /* memory barrier prior to reading state->n_* */
2ced46c2 582 clear_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9
TM		 583 smp_rmb();
584 if (state->n_rdwr != 0) {
2ced46c2 585 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
864472e9
TM		 586 if (ret != 0)
587 return ret;
2ced46c2
TM		 588 if (newstate != state)
589 return -ESTALE;
864472e9
TM		 590 }
591 if (state->n_wronly != 0) {
2ced46c2 592 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
864472e9
TM		 593 if (ret != 0)
594 return ret;
2ced46c2
TM		 595 if (newstate != state)
596 return -ESTALE;
864472e9
TM		 597 }
598 if (state->n_rdonly != 0) {
2ced46c2 599 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
864472e9
TM		 600 if (ret != 0)
601 return ret;
2ced46c2
TM		 602 if (newstate != state)
603 return -ESTALE;
864472e9 604 }
864472e9
TM		 605 return 0;
606}
607
1da177e4
LT		 608/*
609 * OPEN_RECLAIM:
610 * reclaim state on the server after a reboot.
1da177e4 611 */
539cd03a 612static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 613{
864472e9
TM		 614 struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
615 struct nfs4_opendata *opendata;
616 int delegation_type = 0;
1da177e4
LT		 617 int status;
618
619 if (delegation != NULL) {
620 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
621 memcpy(&state->stateid, &delegation->stateid,
622 sizeof(state->stateid));
623 set_bit(NFS_DELEGATED_STATE, &state->flags);
624 return 0;
625 }
864472e9 626 delegation_type = delegation->type;
1da177e4 627 }
ad389da7 628 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
864472e9 629 if (opendata == NULL)
cee54fc9 630 return -ENOMEM;
864472e9
TM		 631 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
632 opendata->o_arg.fh = NFS_FH(state->inode);
633 nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
634 opendata->o_arg.u.delegation_type = delegation_type;
635 status = nfs4_open_recover(opendata, state);
c6d00e63 636 nfs4_opendata_put(opendata);
1da177e4
LT		 637 return status;
638}
639
539cd03a 640static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 641{
642 struct nfs_server *server = NFS_SERVER(state->inode);
643 struct nfs4_exception exception = { };
644 int err;
645 do {
539cd03a 646 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 647 if (err != -NFS4ERR_DELAY)
648 break;
649 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 650 } while (exception.retry);
651 return err;
652}
653
864472e9
TM		 654static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
655{
656 struct nfs_open_context *ctx;
657 int ret;
658
659 ctx = nfs4_state_find_open_context(state);
660 if (IS_ERR(ctx))
661 return PTR_ERR(ctx);
539cd03a 662 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 663 put_nfs_open_context(ctx);
664 return ret;
665}
666
13437e12 667static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 668{
669 struct nfs4_state_owner *sp = state->owner;
e56e0b78 670 struct nfs4_opendata *opendata;
864472e9 671 int ret;
1da177e4 672
ad389da7 673 opendata = nfs4_opendata_alloc(&ctx->path, sp, 0, NULL);
e56e0b78 674 if (opendata == NULL)
864472e9 675 return -ENOMEM;
e56e0b78 676 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
13437e12 677 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
e56e0b78 678 sizeof(opendata->o_arg.u.delegation.data));
864472e9 679 ret = nfs4_open_recover(opendata, state);
c6d00e63 680 nfs4_opendata_put(opendata);
864472e9 681 return ret;
1da177e4
LT		 682}
683
13437e12 684int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 685{
686 struct nfs4_exception exception = { };
539cd03a 687 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 688 int err;
689 do {
13437e12 690 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1da177e4
LT		 691 switch (err) {
692 case 0:
693 return err;
694 case -NFS4ERR_STALE_CLIENTID:
695 case -NFS4ERR_STALE_STATEID:
696 case -NFS4ERR_EXPIRED:
697 /* Don't recall a delegation if it was lost */
7539bbab 698 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 699 return err;
700 }
701 err = nfs4_handle_exception(server, err, &exception);
702 } while (exception.retry);
703 return err;
704}
705
cdd4e68b 706static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1da177e4 707{
cdd4e68b
TM		 708 struct nfs4_opendata *data = calldata;
709 struct rpc_message msg = {
710 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
711 .rpc_argp = &data->c_arg,
712 .rpc_resp = &data->c_res,
713 .rpc_cred = data->owner->so_cred,
1da177e4 714 };
26e976a8 715 data->timestamp = jiffies;
cdd4e68b
TM		 716 rpc_call_setup(task, &msg, 0);
717}
718
719static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
720{
721 struct nfs4_opendata *data = calldata;
722
723 data->rpc_status = task->tk_status;
724 if (RPC_ASSASSINATED(task))
725 return;
26e976a8 726 if (data->rpc_status == 0) {
cdd4e68b
TM		 727 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
728 sizeof(data->o_res.stateid.data));
26e976a8 729 renew_lease(data->o_res.server, data->timestamp);
3e309914 730 data->rpc_done = 1;
26e976a8 731 }
cdd4e68b 732 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
0f9f95e0 733 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
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
TM		 746 goto out_free;
747 nfs_confirm_seqid(&data->owner->so_seqid, 0);
748 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 749 if (!IS_ERR(state))
4a35bd41 750 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 751out_free:
c6d00e63 752 nfs4_opendata_put(data);
cdd4e68b
TM		 753}
754
755static const struct rpc_call_ops nfs4_open_confirm_ops = {
756 .rpc_call_prepare = nfs4_open_confirm_prepare,
757 .rpc_call_done = nfs4_open_confirm_done,
758 .rpc_release = nfs4_open_confirm_release,
759};
760
761/*
762 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
763 */
764static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
765{
766 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
767 struct rpc_task *task;
1da177e4
LT		 768 int status;
769
c6d00e63 770 kref_get(&data->kref);
3e309914
TM		 771 data->rpc_done = 0;
772 data->rpc_status = 0;
cdd4e68b 773 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
7a1218a2 774 if (IS_ERR(task))
cdd4e68b 775 return PTR_ERR(task);
cdd4e68b
TM		 776 status = nfs4_wait_for_completion_rpc_task(task);
777 if (status != 0) {
778 data->cancelled = 1;
779 smp_wmb();
780 } else
781 status = data->rpc_status;
e6b3c4db 782 rpc_put_task(task);
1da177e4
LT		 783 return status;
784}
785
24ac23ab 786static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 787{
24ac23ab
TM		 788 struct nfs4_opendata *data = calldata;
789 struct nfs4_state_owner *sp = data->owner;
1da177e4
LT		 790 struct rpc_message msg = {
791 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
24ac23ab
TM		 792 .rpc_argp = &data->o_arg,
793 .rpc_resp = &data->o_res,
1da177e4
LT		 794 .rpc_cred = sp->so_cred,
795 };
24ac23ab
TM		 796
797 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
798 return;
aac00a8d
TM		 799 /*
800 * Check if we still need to send an OPEN call, or if we can use
801 * a delegation instead.
802 */
803 if (data->state != NULL) {
804 struct nfs_delegation *delegation;
805
6ee41268
TM		 806 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
807 goto out_no_action;
aac00a8d
TM		 808 rcu_read_lock();
809 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
810 if (delegation != NULL &&
811 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
812 rcu_read_unlock();
6ee41268 813 goto out_no_action;
aac00a8d
TM		 814 }
815 rcu_read_unlock();
816 }
24ac23ab 817 /* Update sequence id. */
9f958ab8 818 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 819 data->o_arg.clientid = sp->so_client->cl_clientid;
864472e9
TM		 820 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
821 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
26e976a8 822 data->timestamp = jiffies;
24ac23ab 823 rpc_call_setup(task, &msg, 0);
6ee41268
TM		 824 return;
825out_no_action:
826 task->tk_action = NULL;
827
24ac23ab 828}
1da177e4 829
24ac23ab
TM		 830static void nfs4_open_done(struct rpc_task *task, void *calldata)
831{
832 struct nfs4_opendata *data = calldata;
1da177e4 833
24ac23ab
TM		 834 data->rpc_status = task->tk_status;
835 if (RPC_ASSASSINATED(task))
836 return;
837 if (task->tk_status == 0) {
838 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 839 case S_IFREG:
840 break;
841 case S_IFLNK:
24ac23ab 842 data->rpc_status = -ELOOP;
6f926b5b
TM		 843 break;
844 case S_IFDIR:
24ac23ab 845 data->rpc_status = -EISDIR;
6f926b5b
TM		 846 break;
847 default:
24ac23ab 848 data->rpc_status = -ENOTDIR;
6f926b5b 849 }
26e976a8 850 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 851 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
852 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 853 }
24ac23ab 854 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
3e309914 855 data->rpc_done = 1;
24ac23ab 856}
6f926b5b 857
24ac23ab
TM		 858static void nfs4_open_release(void *calldata)
859{
860 struct nfs4_opendata *data = calldata;
861 struct nfs4_state *state = NULL;
862
863 /* If this request hasn't been cancelled, do nothing */
864 if (data->cancelled == 0)
865 goto out_free;
866 /* In case of error, no cleanup! */
3e309914 867 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 868 goto out_free;
869 /* In case we need an open_confirm, no cleanup! */
870 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
871 goto out_free;
872 nfs_confirm_seqid(&data->owner->so_seqid, 0);
873 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 874 if (!IS_ERR(state))
4a35bd41 875 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 876out_free:
c6d00e63 877 nfs4_opendata_put(data);
24ac23ab
TM		 878}
879
880static const struct rpc_call_ops nfs4_open_ops = {
881 .rpc_call_prepare = nfs4_open_prepare,
882 .rpc_call_done = nfs4_open_done,
883 .rpc_release = nfs4_open_release,
884};
885
886/*
887 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
888 */
889static int _nfs4_proc_open(struct nfs4_opendata *data)
890{
891 struct inode *dir = data->dir->d_inode;
892 struct nfs_server *server = NFS_SERVER(dir);
893 struct nfs_openargs *o_arg = &data->o_arg;
894 struct nfs_openres *o_res = &data->o_res;
895 struct rpc_task *task;
896 int status;
897
c6d00e63 898 kref_get(&data->kref);
3e309914
TM		 899 data->rpc_done = 0;
900 data->rpc_status = 0;
2ced46c2 901 data->cancelled = 0;
24ac23ab 902 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
7a1218a2 903 if (IS_ERR(task))
24ac23ab 904 return PTR_ERR(task);
24ac23ab
TM		 905 status = nfs4_wait_for_completion_rpc_task(task);
906 if (status != 0) {
907 data->cancelled = 1;
908 smp_wmb();
909 } else
910 status = data->rpc_status;
e6b3c4db 911 rpc_put_task(task);
3e309914 912 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 913 return status;
914
56ae19f3
TM		 915 if (o_arg->open_flags & O_CREAT) {
916 update_changeattr(dir, &o_res->cinfo);
917 nfs_post_op_update_inode(dir, o_res->dir_attr);
918 } else
919 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 920 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 921 status = _nfs4_proc_open_confirm(data);
1da177e4 922 if (status != 0)
24ac23ab 923 return status;
1da177e4
LT		 924 }
925 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
8fa5c000 926 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 927 return 0;
1da177e4
LT		 928}
929
930static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
931{
932 struct nfs_access_entry cache;
933 int mask = 0;
934 int status;
935
936 if (openflags & FMODE_READ)
937 mask |= MAY_READ;
938 if (openflags & FMODE_WRITE)
939 mask |= MAY_WRITE;
1b45c46c
TM		 940 if (openflags & FMODE_EXEC)
941 mask |= MAY_EXEC;
1da177e4
LT		 942 status = nfs_access_get_cached(inode, cred, &cache);
943 if (status == 0)
944 goto out;
945
946 /* Be clever: ask server to check for all possible rights */
947 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
948 cache.cred = cred;
949 cache.jiffies = jiffies;
950 status = _nfs4_proc_access(inode, &cache);
951 if (status != 0)
952 return status;
953 nfs_access_add_cache(inode, &cache);
954out:
955 if ((cache.mask & mask) == mask)
956 return 0;
957 return -EACCES;
958}
959
10afec90 960static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 961{
7539bbab 962 struct nfs_client *clp = server->nfs_client;
6b30954e 963 int ret;
58d9714a 964
6b30954e
TM		 965 for (;;) {
966 ret = nfs4_wait_clnt_recover(server->client, clp);
967 if (ret != 0)
968 return ret;
969 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
970 break;
58d9714a 971 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 972 }
973 return 0;
58d9714a
TM		 974}
975
1da177e4
LT		 976/*
977 * OPEN_EXPIRED:
978 * reclaim state on the server after a network partition.
979 * Assumes caller holds the appropriate lock
980 */
539cd03a 981static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 982{
1da177e4 983 struct inode *inode = state->inode;
1da177e4 984 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
e56e0b78 985 struct nfs4_opendata *opendata;
24ac23ab 986 int openflags = state->state & (FMODE_READ|FMODE_WRITE);
864472e9 987 int ret;
1da177e4
LT		 988
989 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
539cd03a 990 ret = _nfs4_do_access(inode, ctx->cred, openflags);
864472e9
TM		 991 if (ret < 0)
992 return ret;
1da177e4
LT		 993 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
994 set_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9 995 return 0;
1da177e4 996 }
ad389da7 997 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, openflags, NULL);
e56e0b78 998 if (opendata == NULL)
864472e9
TM		 999 return -ENOMEM;
1000 ret = nfs4_open_recover(opendata, state);
1001 if (ret == -ESTALE) {
1002 /* Invalidate the state owner so we don't ever use it again */
539cd03a
TM		 1003 nfs4_drop_state_owner(state->owner);
1004 d_drop(ctx->path.dentry);
1da177e4 1005 }
c6d00e63 1006 nfs4_opendata_put(opendata);
864472e9 1007 return ret;
1da177e4
LT		 1008}
1009
539cd03a 1010static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 1011{
539cd03a 1012 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 1013 struct nfs4_exception exception = { };
1014 int err;
1015
1016 do {
539cd03a 1017 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 1018 if (err == -NFS4ERR_DELAY)
1019 nfs4_handle_exception(server, err, &exception);
1020 } while (exception.retry);
1021 return err;
1022}
1023
1da177e4
LT		 1024static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1025{
1da177e4 1026 struct nfs_open_context *ctx;
864472e9 1027 int ret;
1da177e4 1028
864472e9
TM		 1029 ctx = nfs4_state_find_open_context(state);
1030 if (IS_ERR(ctx))
1031 return PTR_ERR(ctx);
539cd03a 1032 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1033 put_nfs_open_context(ctx);
1034 return ret;
1da177e4
LT		 1035}
1036
aa53ed54
JL		 1037/*
1038 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1039 * fields corresponding to attributes that were used to store the verifier.
1040 * Make sure we clobber those fields in the later setattr call
1041 */
1042static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1043{
1044 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1045 !(sattr->ia_valid & ATTR_ATIME_SET))
1046 sattr->ia_valid |= ATTR_ATIME;
1047
1048 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1049 !(sattr->ia_valid & ATTR_MTIME_SET))
1050 sattr->ia_valid |= ATTR_MTIME;
1051}
1052
1da177e4 1053/*
24ac23ab 1054 * Returns a referenced nfs4_state
1da177e4 1055 */
ad389da7 1056static 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		 1057{
1058 struct nfs4_state_owner *sp;
1059 struct nfs4_state *state = NULL;
1060 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 1061 struct nfs_client *clp = server->nfs_client;
e56e0b78 1062 struct nfs4_opendata *opendata;
aac00a8d 1063 int status;
1da177e4
LT		 1064
1065 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1066 status = -ENOMEM;
1067 if (!(sp = nfs4_get_state_owner(server, cred))) {
1068 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1069 goto out_err;
1070 }
58d9714a
TM		 1071 status = nfs4_recover_expired_lease(server);
1072 if (status != 0)
b4454fe1 1073 goto err_put_state_owner;
aac00a8d
TM		 1074 if (path->dentry->d_inode != NULL)
1075 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a
TM		 1076 down_read(&clp->cl_sem);
1077 status = -ENOMEM;
ad389da7 1078 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1079 if (opendata == NULL)
76723de0 1080 goto err_release_rwsem;
1da177e4 1081
aac00a8d
TM		 1082 if (path->dentry->d_inode != NULL)
1083 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1084
24ac23ab 1085 status = _nfs4_proc_open(opendata);
1da177e4 1086 if (status != 0)
c6d00e63 1087 goto err_opendata_put;
1da177e4 1088
aa53ed54
JL		 1089 if (opendata->o_arg.open_flags & O_EXCL)
1090 nfs4_exclusive_attrset(opendata, sattr);
1091
24ac23ab 1092 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1093 status = PTR_ERR(state);
1094 if (IS_ERR(state))
c6d00e63 1095 goto err_opendata_put;
c6d00e63 1096 nfs4_opendata_put(opendata);
1da177e4
LT		 1097 nfs4_put_state_owner(sp);
1098 up_read(&clp->cl_sem);
1099 *res = state;
1100 return 0;
c6d00e63
TM		 1101err_opendata_put:
1102 nfs4_opendata_put(opendata);
76723de0
TM		 1103err_release_rwsem:
1104 up_read(&clp->cl_sem);
e56e0b78
TM		 1105err_put_state_owner:
1106 nfs4_put_state_owner(sp);
1da177e4 1107out_err:
1da177e4
LT		 1108 *res = NULL;
1109 return status;
1110}
1111
1112
ad389da7 1113static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1114{
1115 struct nfs4_exception exception = { };
1116 struct nfs4_state *res;
1117 int status;
1118
1119 do {
ad389da7 1120 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1121 if (status == 0)
1122 break;
1123 /* NOTE: BAD_SEQID means the server and client disagree about the
1124 * book-keeping w.r.t. state-changing operations
1125 * (OPEN/CLOSE/LOCK/LOCKU...)
1126 * It is actually a sign of a bug on the client or on the server.
1127 *
1128 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1129 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1130 * have unhashed the old state_owner for us, and that we can
1131 * therefore safely retry using a new one. We should still warn
1132 * the user though...
1133 */
1134 if (status == -NFS4ERR_BAD_SEQID) {
6f43ddcc
TM		 1135 printk(KERN_WARNING "NFS: v4 server %s "
1136 " returned a bad sequence-id error!\n",
1137 NFS_SERVER(dir)->nfs_client->cl_hostname);
1da177e4
LT		 1138 exception.retry = 1;
1139 continue;
1140 }
550f5747
TM		 1141 /*
1142 * BAD_STATEID on OPEN means that the server cancelled our
1143 * state before it received the OPEN_CONFIRM.
1144 * Recover by retrying the request as per the discussion
1145 * on Page 181 of RFC3530.
1146 */
1147 if (status == -NFS4ERR_BAD_STATEID) {
1148 exception.retry = 1;
1149 continue;
1150 }
aac00a8d
TM		 1151 if (status == -EAGAIN) {
1152 /* We must have found a delegation */
1153 exception.retry = 1;
1154 continue;
1155 }
1da177e4
LT		 1156 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1157 status, &exception));
1158 } while (exception.retry);
1159 return res;
1160}
1161
3e4f6290
TM		 1162static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1163 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1164{
3e4f6290 1165 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1166 struct nfs_setattrargs arg = {
3e4f6290 1167 .fh = NFS_FH(inode),
1da177e4
LT		 1168 .iap = sattr,
1169 .server = server,
1170 .bitmask = server->attr_bitmask,
1171 };
1172 struct nfs_setattrres res = {
1173 .fattr = fattr,
1174 .server = server,
1175 };
1176 struct rpc_message msg = {
1177 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1178 .rpc_argp = &arg,
1179 .rpc_resp = &res,
1180 };
26e976a8 1181 unsigned long timestamp = jiffies;
65e4308d 1182 int status;
1da177e4 1183
0e574af1 1184 nfs_fattr_init(fattr);
1da177e4 1185
3e4f6290
TM		 1186 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1187 /* Use that stateid */
1188 } else if (state != NULL) {
1da177e4 1189 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1190 nfs4_copy_stateid(&arg.stateid, state, current->files);
1191 } else
1da177e4
LT		 1192 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1193
65e4308d 1194 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1195 if (status == 0 && state != NULL)
1196 renew_lease(server, timestamp);
65e4308d 1197 return status;
1da177e4
LT		 1198}
1199
3e4f6290
TM		 1200static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1201 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1202{
3e4f6290 1203 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1204 struct nfs4_exception exception = { };
1205 int err;
1206 do {
1207 err = nfs4_handle_exception(server,
3e4f6290 1208 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1209 &exception);
1210 } while (exception.retry);
1211 return err;
1212}
1213
1214struct nfs4_closedata {
4a35bd41 1215 struct path path;
1da177e4
LT		 1216 struct inode *inode;
1217 struct nfs4_state *state;
1218 struct nfs_closeargs arg;
1219 struct nfs_closeres res;
516a6af6 1220 struct nfs_fattr fattr;
26e976a8 1221 unsigned long timestamp;
1da177e4
LT		 1222};
1223
963d8fe5 1224static void nfs4_free_closedata(void *data)
9512135d 1225{
963d8fe5
TM		 1226 struct nfs4_closedata *calldata = data;
1227 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1228
1229 nfs4_put_open_state(calldata->state);
1230 nfs_free_seqid(calldata->arg.seqid);
9512135d 1231 nfs4_put_state_owner(sp);
4a35bd41
TM		 1232 dput(calldata->path.dentry);
1233 mntput(calldata->path.mnt);
9512135d
TM		 1234 kfree(calldata);
1235}
1236
963d8fe5 1237static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1238{
963d8fe5 1239 struct nfs4_closedata *calldata = data;
1da177e4 1240 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1241 struct nfs_server *server = NFS_SERVER(calldata->inode);
1242
4ce70ada
TM		 1243 if (RPC_ASSASSINATED(task))
1244 return;
1da177e4
LT		 1245 /* hmm. we are done with the inode, and in the process of freeing
1246 * the state_owner. we keep this around to process errors
1247 */
cee54fc9 1248 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1249 switch (task->tk_status) {
1250 case 0:
003707c7 1251 nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
26e976a8 1252 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1253 break;
1254 case -NFS4ERR_STALE_STATEID:
1255 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1256 break;
1257 default:
1258 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1259 rpc_restart_call(task);
1260 return;
1261 }
1262 }
516a6af6 1263 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1264}
1265
4ce70ada 1266static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1267{
4ce70ada 1268 struct nfs4_closedata *calldata = data;
9512135d 1269 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1270 struct rpc_message msg = {
1271 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1272 .rpc_argp = &calldata->arg,
1273 .rpc_resp = &calldata->res,
9512135d 1274 .rpc_cred = state->owner->so_cred,
1da177e4 1275 };
003707c7
TM		 1276 int clear_rd, clear_wr, clear_rdwr;
1277 int mode;
9512135d 1278
963d8fe5 1279 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1280 return;
003707c7
TM		 1281
1282 mode = FMODE_READ|FMODE_WRITE;
1283 clear_rd = clear_wr = clear_rdwr = 0;
4cecb76f
TM		 1284 spin_lock(&state->owner->so_lock);
1285 spin_lock(&calldata->inode->i_lock);
003707c7 1286 /* Calculate the change in open mode */
e7616923 1287 if (state->n_rdwr == 0) {
003707c7 1288 if (state->n_rdonly == 0) {
e7616923 1289 mode &= ~FMODE_READ;
003707c7
TM		 1290 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1291 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1292 }
1293 if (state->n_wronly == 0) {
e7616923 1294 mode &= ~FMODE_WRITE;
003707c7
TM		 1295 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1296 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1297 }
e7616923 1298 }
4cecb76f
TM		 1299 spin_unlock(&calldata->inode->i_lock);
1300 spin_unlock(&state->owner->so_lock);
003707c7 1301 if (!clear_rd && !clear_wr && !clear_rdwr) {
963d8fe5
TM		 1302 /* Note: exit _without_ calling nfs4_close_done */
1303 task->tk_action = NULL;
9512135d
TM		 1304 return;
1305 }
516a6af6 1306 nfs_fattr_init(calldata->res.fattr);
9512135d 1307 if (mode != 0)
1da177e4 1308 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d 1309 calldata->arg.open_flags = mode;
26e976a8 1310 calldata->timestamp = jiffies;
9512135d 1311 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1312}
1313
963d8fe5 1314static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1315 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1316 .rpc_call_done = nfs4_close_done,
1317 .rpc_release = nfs4_free_closedata,
1318};
1319
1da177e4
LT		 1320/*
1321 * It is possible for data to be read/written from a mem-mapped file
1322 * after the sys_close call (which hits the vfs layer as a flush).
1323 * This means that we can't safely call nfsv4 close on a file until
1324 * the inode is cleared. This in turn means that we are not good
1325 * NFSv4 citizens - we do not indicate to the server to update the file's
1326 * share state even when we are done with one of the three share
1327 * stateid's in the inode.
1328 *
1329 * NOTE: Caller must be holding the sp->so_owner semaphore!
1330 */
4a35bd41 1331int nfs4_do_close(struct path *path, struct nfs4_state *state)
1da177e4 1332{
4a35bd41 1333 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4 1334 struct nfs4_closedata *calldata;
b39e625b
TM		 1335 struct nfs4_state_owner *sp = state->owner;
1336 struct rpc_task *task;
9512135d 1337 int status = -ENOMEM;
1da177e4 1338
9512135d 1339 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1340 if (calldata == NULL)
9512135d 1341 goto out;
4a35bd41 1342 calldata->inode = state->inode;
1da177e4 1343 calldata->state = state;
4a35bd41 1344 calldata->arg.fh = NFS_FH(state->inode);
003707c7 1345 calldata->arg.stateid = &state->open_stateid;
1da177e4 1346 /* Serialization for the sequence id */
cee54fc9 1347 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1348 if (calldata->arg.seqid == NULL)
1349 goto out_free_calldata;
516a6af6
TM		 1350 calldata->arg.bitmask = server->attr_bitmask;
1351 calldata->res.fattr = &calldata->fattr;
1352 calldata->res.server = server;
4a35bd41
TM		 1353 calldata->path.mnt = mntget(path->mnt);
1354 calldata->path.dentry = dget(path->dentry);
9512135d 1355
b39e625b
TM		 1356 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1357 if (IS_ERR(task))
1358 return PTR_ERR(task);
1359 rpc_put_task(task);
1360 return 0;
9512135d
TM		 1361out_free_calldata:
1362 kfree(calldata);
1363out:
b39e625b
TM		 1364 nfs4_put_open_state(state);
1365 nfs4_put_state_owner(sp);
9512135d 1366 return status;
1da177e4
LT		 1367}
1368
4a35bd41 1369static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
02a913a7
TM		 1370{
1371 struct file *filp;
1b45c46c 1372 int ret;
02a913a7 1373
1b45c46c
TM		 1374 /* If the open_intent is for execute, we have an extra check to make */
1375 if (nd->intent.open.flags & FMODE_EXEC) {
1376 ret = _nfs4_do_access(state->inode,
1377 state->owner->so_cred,
1378 nd->intent.open.flags);
1379 if (ret < 0)
1380 goto out_close;
1381 }
4a35bd41 1382 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
02a913a7
TM		 1383 if (!IS_ERR(filp)) {
1384 struct nfs_open_context *ctx;
1385 ctx = (struct nfs_open_context *)filp->private_data;
1386 ctx->state = state;
95cf959b
TM		 1387 return 0;
1388 }
1b45c46c
TM		 1389 ret = PTR_ERR(filp);
1390out_close:
4a35bd41 1391 nfs4_close_state(path, state, nd->intent.open.flags);
1b45c46c 1392 return ret;
02a913a7
TM		 1393}
1394
1395struct dentry *
1da177e4
LT		 1396nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1397{
ad389da7
TM		 1398 struct path path = {
1399 .mnt = nd->mnt,
1400 .dentry = dentry,
1401 };
1da177e4
LT		 1402 struct iattr attr;
1403 struct rpc_cred *cred;
1404 struct nfs4_state *state;
02a913a7 1405 struct dentry *res;
1da177e4
LT		 1406
1407 if (nd->flags & LOOKUP_CREATE) {
1408 attr.ia_mode = nd->intent.open.create_mode;
1409 attr.ia_valid = ATTR_MODE;
1410 if (!IS_POSIXACL(dir))
1411 attr.ia_mode &= ~current->fs->umask;
1412 } else {
1413 attr.ia_valid = 0;
1414 BUG_ON(nd->intent.open.flags & O_CREAT);
1415 }
1416
1f163415 1417 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1418 if (IS_ERR(cred))
02a913a7 1419 return (struct dentry *)cred;
ad389da7 1420 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1421 put_rpccred(cred);
02a913a7
TM		 1422 if (IS_ERR(state)) {
1423 if (PTR_ERR(state) == -ENOENT)
1424 d_add(dentry, NULL);
1425 return (struct dentry *)state;
1426 }
24ac23ab 1427 res = d_add_unique(dentry, igrab(state->inode));
02a913a7
TM		 1428 if (res != NULL)
1429 dentry = res;
4a35bd41 1430 nfs4_intent_set_file(nd, &path, state);
02a913a7 1431 return res;
1da177e4
LT		 1432}
1433
1434int
02a913a7 1435nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1436{
ad389da7
TM		 1437 struct path path = {
1438 .mnt = nd->mnt,
1439 .dentry = dentry,
1440 };
1da177e4
LT		 1441 struct rpc_cred *cred;
1442 struct nfs4_state *state;
1da177e4 1443
1f163415 1444 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1445 if (IS_ERR(cred))
1446 return PTR_ERR(cred);
aac00a8d 1447 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1448 put_rpccred(cred);
02a913a7
TM		 1449 if (IS_ERR(state)) {
1450 switch (PTR_ERR(state)) {
1451 case -EPERM:
1452 case -EACCES:
1453 case -EDQUOT:
1454 case -ENOSPC:
1455 case -EROFS:
1456 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1457 return 1;
b87c0adf
CL		 1458 default:
1459 goto out_drop;
02a913a7 1460 }
02a913a7 1461 }
24ac23ab 1462 if (state->inode == dentry->d_inode) {
4a35bd41 1463 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1464 return 1;
1465 }
4a35bd41 1466 nfs4_close_state(&path, state, openflags);
02a913a7
TM		 1467out_drop:
1468 d_drop(dentry);
1da177e4
LT		 1469 return 0;
1470}
1471
1472
1473static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1474{
1475 struct nfs4_server_caps_res res = {};
1476 struct rpc_message msg = {
1477 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1478 .rpc_argp = fhandle,
1479 .rpc_resp = &res,
1480 };
1481 int status;
1482
1483 status = rpc_call_sync(server->client, &msg, 0);
1484 if (status == 0) {
1485 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1486 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1487 server->caps |= NFS_CAP_ACLS;
1488 if (res.has_links != 0)
1489 server->caps |= NFS_CAP_HARDLINKS;
1490 if (res.has_symlinks != 0)
1491 server->caps |= NFS_CAP_SYMLINKS;
1492 server->acl_bitmask = res.acl_bitmask;
1493 }
1494 return status;
1495}
1496
55a97593 1497int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1498{
1499 struct nfs4_exception exception = { };
1500 int err;
1501 do {
1502 err = nfs4_handle_exception(server,
1503 _nfs4_server_capabilities(server, fhandle),
1504 &exception);
1505 } while (exception.retry);
1506 return err;
1507}
1508
1509static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1510 struct nfs_fsinfo *info)
1511{
1da177e4
LT		 1512 struct nfs4_lookup_root_arg args = {
1513 .bitmask = nfs4_fattr_bitmap,
1514 };
1515 struct nfs4_lookup_res res = {
1516 .server = server,
0e574af1 1517 .fattr = info->fattr,
1da177e4
LT		 1518 .fh = fhandle,
1519 };
1520 struct rpc_message msg = {
1521 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1522 .rpc_argp = &args,
1523 .rpc_resp = &res,
1524 };
0e574af1 1525 nfs_fattr_init(info->fattr);
1da177e4
LT		 1526 return rpc_call_sync(server->client, &msg, 0);
1527}
1528
1529static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1530 struct nfs_fsinfo *info)
1531{
1532 struct nfs4_exception exception = { };
1533 int err;
1534 do {
1535 err = nfs4_handle_exception(server,
1536 _nfs4_lookup_root(server, fhandle, info),
1537 &exception);
1538 } while (exception.retry);
1539 return err;
1540}
1541
54ceac45
DH		 1542/*
1543 * get the file handle for the "/" directory on the server
1544 */
1da177e4 1545static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1546 struct nfs_fsinfo *info)
1da177e4 1547{
1da177e4
LT		 1548 int status;
1549
1da177e4 1550 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1551 if (status == 0)
1552 status = nfs4_server_capabilities(server, fhandle);
1553 if (status == 0)
1554 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1555 return nfs4_map_errors(status);
1da177e4
LT		 1556}
1557
6b97fd3d
MN		 1558/*
1559 * Get locations and (maybe) other attributes of a referral.
1560 * Note that we'll actually follow the referral later when
1561 * we detect fsid mismatch in inode revalidation
1562 */
1563static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1564{
1565 int status = -ENOMEM;
1566 struct page *page = NULL;
1567 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1568
1569 page = alloc_page(GFP_KERNEL);
1570 if (page == NULL)
1571 goto out;
1572 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1573 if (locations == NULL)
1574 goto out;
1575
c228fd3a 1576 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1577 if (status != 0)
1578 goto out;
1579 /* Make sure server returned a different fsid for the referral */
1580 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1581 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1582 status = -EIO;
1583 goto out;
1584 }
1585
1586 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1587 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1588 if (!fattr->mode)
1589 fattr->mode = S_IFDIR;
1590 memset(fhandle, 0, sizeof(struct nfs_fh));
1591out:
1592 if (page)
1593 __free_page(page);
1594 if (locations)
1595 kfree(locations);
1596 return status;
1597}
1598
1da177e4
LT		 1599static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1600{
1601 struct nfs4_getattr_arg args = {
1602 .fh = fhandle,
1603 .bitmask = server->attr_bitmask,
1604 };
1605 struct nfs4_getattr_res res = {
1606 .fattr = fattr,
1607 .server = server,
1608 };
1609 struct rpc_message msg = {
1610 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1611 .rpc_argp = &args,
1612 .rpc_resp = &res,
1613 };
1614
0e574af1 1615 nfs_fattr_init(fattr);
1da177e4
LT		 1616 return rpc_call_sync(server->client, &msg, 0);
1617}
1618
1619static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1620{
1621 struct nfs4_exception exception = { };
1622 int err;
1623 do {
1624 err = nfs4_handle_exception(server,
1625 _nfs4_proc_getattr(server, fhandle, fattr),
1626 &exception);
1627 } while (exception.retry);
1628 return err;
1629}
1630
1631/*
1632 * The file is not closed if it is opened due to the a request to change
1633 * the size of the file. The open call will not be needed once the
1634 * VFS layer lookup-intents are implemented.
1635 *
1636 * Close is called when the inode is destroyed.
1637 * If we haven't opened the file for O_WRONLY, we
1638 * need to in the size_change case to obtain a stateid.
1639 *
1640 * Got race?
1641 * Because OPEN is always done by name in nfsv4, it is
1642 * possible that we opened a different file by the same
1643 * name. We can recognize this race condition, but we
1644 * can't do anything about it besides returning an error.
1645 *
1646 * This will be fixed with VFS changes (lookup-intent).
1647 */
1648static int
1649nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1650 struct iattr *sattr)
1651{
08e9eac4
TM		 1652 struct rpc_cred *cred;
1653 struct inode *inode = dentry->d_inode;
d530838b
TM		 1654 struct nfs_open_context *ctx;
1655 struct nfs4_state *state = NULL;
1da177e4
LT		 1656 int status;
1657
0e574af1 1658 nfs_fattr_init(fattr);
1da177e4 1659
1f163415 1660 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1661 if (IS_ERR(cred))
1662 return PTR_ERR(cred);
d530838b
TM		 1663
1664 /* Search for an existing open(O_WRITE) file */
1665 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1666 if (ctx != NULL)
1667 state = ctx->state;
08e9eac4 1668
3e4f6290 1669 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1670 if (status == 0)
1671 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1672 if (ctx != NULL)
1673 put_nfs_open_context(ctx);
08e9eac4 1674 put_rpccred(cred);
1da177e4
LT		 1675 return status;
1676}
1677
2b3de441
DH		 1678static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1679 struct qstr *name, struct nfs_fh *fhandle,
1680 struct nfs_fattr *fattr)
1681{
1682 int status;
1683 struct nfs4_lookup_arg args = {
1684 .bitmask = server->attr_bitmask,
1685 .dir_fh = dirfh,
1686 .name = name,
1687 };
1688 struct nfs4_lookup_res res = {
1689 .server = server,
1690 .fattr = fattr,
1691 .fh = fhandle,
1692 };
1693 struct rpc_message msg = {
1694 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1695 .rpc_argp = &args,
1696 .rpc_resp = &res,
1697 };
1698
1699 nfs_fattr_init(fattr);
1700
1701 dprintk("NFS call lookupfh %s\n", name->name);
1702 status = rpc_call_sync(server->client, &msg, 0);
1703 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1704 return status;
1705}
1706
1707static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1708 struct qstr *name, struct nfs_fh *fhandle,
1709 struct nfs_fattr *fattr)
1710{
1711 struct nfs4_exception exception = { };
1712 int err;
1713 do {
4e56e082
TM		 1714 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1715 /* FIXME: !!!! */
1716 if (err == -NFS4ERR_MOVED) {
1717 err = -EREMOTE;
1718 break;
1719 }
1720 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1721 } while (exception.retry);
1722 return err;
1723}
1724
1da177e4
LT		 1725static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1726 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1727{
4e56e082 1728 int status;
1da177e4
LT		 1729
1730 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1731 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1732 if (status == -NFS4ERR_MOVED)
1733 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1734 dprintk("NFS reply lookup: %d\n", status);
1735 return status;
1736}
1737
1738static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1739{
1740 struct nfs4_exception exception = { };
1741 int err;
1742 do {
1743 err = nfs4_handle_exception(NFS_SERVER(dir),
1744 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1745 &exception);
1746 } while (exception.retry);
1747 return err;
1748}
1749
1750static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1751{
1752 struct nfs4_accessargs args = {
1753 .fh = NFS_FH(inode),
1754 };
1755 struct nfs4_accessres res = { 0 };
1756 struct rpc_message msg = {
1757 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1758 .rpc_argp = &args,
1759 .rpc_resp = &res,
1760 .rpc_cred = entry->cred,
1761 };
1762 int mode = entry->mask;
1763 int status;
1764
1765 /*
1766 * Determine which access bits we want to ask for...
1767 */
1768 if (mode & MAY_READ)
1769 args.access |= NFS4_ACCESS_READ;
1770 if (S_ISDIR(inode->i_mode)) {
1771 if (mode & MAY_WRITE)
1772 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1773 if (mode & MAY_EXEC)
1774 args.access |= NFS4_ACCESS_LOOKUP;
1775 } else {
1776 if (mode & MAY_WRITE)
1777 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1778 if (mode & MAY_EXEC)
1779 args.access |= NFS4_ACCESS_EXECUTE;
1780 }
1781 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1782 if (!status) {
1783 entry->mask = 0;
1784 if (res.access & NFS4_ACCESS_READ)
1785 entry->mask |= MAY_READ;
1786 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1787 entry->mask |= MAY_WRITE;
1788 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1789 entry->mask |= MAY_EXEC;
1790 }
1791 return status;
1792}
1793
1794static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1795{
1796 struct nfs4_exception exception = { };
1797 int err;
1798 do {
1799 err = nfs4_handle_exception(NFS_SERVER(inode),
1800 _nfs4_proc_access(inode, entry),
1801 &exception);
1802 } while (exception.retry);
1803 return err;
1804}
1805
1806/*
1807 * TODO: For the time being, we don't try to get any attributes
1808 * along with any of the zero-copy operations READ, READDIR,
1809 * READLINK, WRITE.
1810 *
1811 * In the case of the first three, we want to put the GETATTR
1812 * after the read-type operation -- this is because it is hard
1813 * to predict the length of a GETATTR response in v4, and thus
1814 * align the READ data correctly. This means that the GETATTR
1815 * may end up partially falling into the page cache, and we should
1816 * shift it into the 'tail' of the xdr_buf before processing.
1817 * To do this efficiently, we need to know the total length
1818 * of data received, which doesn't seem to be available outside
1819 * of the RPC layer.
1820 *
1821 * In the case of WRITE, we also want to put the GETATTR after
1822 * the operation -- in this case because we want to make sure
1823 * we get the post-operation mtime and size. This means that
1824 * we can't use xdr_encode_pages() as written: we need a variant
1825 * of it which would leave room in the 'tail' iovec.
1826 *
1827 * Both of these changes to the XDR layer would in fact be quite
1828 * minor, but I decided to leave them for a subsequent patch.
1829 */
1830static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1831 unsigned int pgbase, unsigned int pglen)
1832{
1833 struct nfs4_readlink args = {
1834 .fh = NFS_FH(inode),
1835 .pgbase = pgbase,
1836 .pglen = pglen,
1837 .pages = &page,
1838 };
1839 struct rpc_message msg = {
1840 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1841 .rpc_argp = &args,
1842 .rpc_resp = NULL,
1843 };
1844
1845 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1846}
1847
1848static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1849 unsigned int pgbase, unsigned int pglen)
1850{
1851 struct nfs4_exception exception = { };
1852 int err;
1853 do {
1854 err = nfs4_handle_exception(NFS_SERVER(inode),
1855 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1856 &exception);
1857 } while (exception.retry);
1858 return err;
1859}
1860
1da177e4
LT		 1861/*
1862 * Got race?
1863 * We will need to arrange for the VFS layer to provide an atomic open.
1864 * Until then, this create/open method is prone to inefficiency and race
1865 * conditions due to the lookup, create, and open VFS calls from sys_open()
1866 * placed on the wire.
1867 *
1868 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1869 * The file will be opened again in the subsequent VFS open call
1870 * (nfs4_proc_file_open).
1871 *
1872 * The open for read will just hang around to be used by any process that
1873 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1874 */
1875
1876static int
1877nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1878 int flags, struct nameidata *nd)
1da177e4 1879{
ad389da7
TM		 1880 struct path path = {
1881 .mnt = nd->mnt,
1882 .dentry = dentry,
1883 };
1da177e4
LT		 1884 struct nfs4_state *state;
1885 struct rpc_cred *cred;
1886 int status = 0;
1887
1f163415 1888 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1889 if (IS_ERR(cred)) {
1890 status = PTR_ERR(cred);
1891 goto out;
1892 }
ad389da7 1893 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1da177e4
LT		 1894 put_rpccred(cred);
1895 if (IS_ERR(state)) {
1896 status = PTR_ERR(state);
1897 goto out;
1898 }
24ac23ab 1899 d_instantiate(dentry, igrab(state->inode));
1da177e4
LT		 1900 if (flags & O_EXCL) {
1901 struct nfs_fattr fattr;
3e4f6290 1902 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1903 if (status == 0)
65e4308d 1904 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1905 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1906 }
ad389da7 1907 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1908 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1909 else
4a35bd41 1910 nfs4_close_state(&path, state, flags);
1da177e4
LT		 1911out:
1912 return status;
1913}
1914
1915static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1916{
16e42959 1917 struct nfs_server *server = NFS_SERVER(dir);
1da177e4
LT		 1918 struct nfs4_remove_arg args = {
1919 .fh = NFS_FH(dir),
1920 .name = name,
16e42959
TM		 1921 .bitmask = server->attr_bitmask,
1922 };
1923 struct nfs_fattr dir_attr;
1924 struct nfs4_remove_res res = {
1925 .server = server,
1926 .dir_attr = &dir_attr,
1da177e4 1927 };
1da177e4
LT		 1928 struct rpc_message msg = {
1929 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1930 .rpc_argp = &args,
1931 .rpc_resp = &res,
1932 };
1933 int status;
1934
16e42959
TM		 1935 nfs_fattr_init(res.dir_attr);
1936 status = rpc_call_sync(server->client, &msg, 0);
1937 if (status == 0) {
1938 update_changeattr(dir, &res.cinfo);
1939 nfs_post_op_update_inode(dir, res.dir_attr);
1940 }
1da177e4
LT		 1941 return status;
1942}
1943
1944static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1945{
1946 struct nfs4_exception exception = { };
1947 int err;
1948 do {
1949 err = nfs4_handle_exception(NFS_SERVER(dir),
1950 _nfs4_proc_remove(dir, name),
1951 &exception);
1952 } while (exception.retry);
1953 return err;
1954}
1955
1956struct unlink_desc {
1957 struct nfs4_remove_arg args;
16e42959
TM		 1958 struct nfs4_remove_res res;
1959 struct nfs_fattr dir_attr;
1da177e4
LT		 1960};
1961
1962static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1963 struct qstr *name)
1964{
16e42959 1965 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1da177e4
LT		 1966 struct unlink_desc *up;
1967
5cbded58 1968 up = kmalloc(sizeof(*up), GFP_KERNEL);
1da177e4
LT		 1969 if (!up)
1970 return -ENOMEM;
1971
1972 up->args.fh = NFS_FH(dir->d_inode);
1973 up->args.name = name;
16e42959
TM		 1974 up->args.bitmask = server->attr_bitmask;
1975 up->res.server = server;
1976 up->res.dir_attr = &up->dir_attr;
1da177e4
LT		 1977
1978 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1979 msg->rpc_argp = &up->args;
1980 msg->rpc_resp = &up->res;
1981 return 0;
1982}
1983
1984static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1985{
1986 struct rpc_message *msg = &task->tk_msg;
1987 struct unlink_desc *up;
1988
1989 if (msg->rpc_resp != NULL) {
1990 up = container_of(msg->rpc_resp, struct unlink_desc, res);
16e42959
TM		 1991 update_changeattr(dir->d_inode, &up->res.cinfo);
1992 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1da177e4
LT		 1993 kfree(up);
1994 msg->rpc_resp = NULL;
1995 msg->rpc_argp = NULL;
1996 }
1997 return 0;
1998}
1999
2000static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2001 struct inode *new_dir, struct qstr *new_name)
2002{
6caf2c82 2003 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 2004 struct nfs4_rename_arg arg = {
2005 .old_dir = NFS_FH(old_dir),
2006 .new_dir = NFS_FH(new_dir),
2007 .old_name = old_name,
2008 .new_name = new_name,
6caf2c82
TM		 2009 .bitmask = server->attr_bitmask,
2010 };
2011 struct nfs_fattr old_fattr, new_fattr;
2012 struct nfs4_rename_res res = {
2013 .server = server,
2014 .old_fattr = &old_fattr,
2015 .new_fattr = &new_fattr,
1da177e4 2016 };
1da177e4
LT		 2017 struct rpc_message msg = {
2018 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2019 .rpc_argp = &arg,
2020 .rpc_resp = &res,
2021 };
2022 int status;
2023
6caf2c82
TM		 2024 nfs_fattr_init(res.old_fattr);
2025 nfs_fattr_init(res.new_fattr);
2026 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2027
2028 if (!status) {
2029 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2030 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2031 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2032 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2033 }
2034 return status;
2035}
2036
2037static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2038 struct inode *new_dir, struct qstr *new_name)
2039{
2040 struct nfs4_exception exception = { };
2041 int err;
2042 do {
2043 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2044 _nfs4_proc_rename(old_dir, old_name,
2045 new_dir, new_name),
2046 &exception);
2047 } while (exception.retry);
2048 return err;
2049}
2050
2051static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2052{
91ba2eee 2053 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2054 struct nfs4_link_arg arg = {
2055 .fh = NFS_FH(inode),
2056 .dir_fh = NFS_FH(dir),
2057 .name = name,
91ba2eee
TM		 2058 .bitmask = server->attr_bitmask,
2059 };
2060 struct nfs_fattr fattr, dir_attr;
2061 struct nfs4_link_res res = {
2062 .server = server,
2063 .fattr = &fattr,
2064 .dir_attr = &dir_attr,
1da177e4 2065 };
1da177e4
LT		 2066 struct rpc_message msg = {
2067 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2068 .rpc_argp = &arg,
91ba2eee 2069 .rpc_resp = &res,
1da177e4
LT		 2070 };
2071 int status;
2072
91ba2eee
TM		 2073 nfs_fattr_init(res.fattr);
2074 nfs_fattr_init(res.dir_attr);
2075 status = rpc_call_sync(server->client, &msg, 0);
2076 if (!status) {
2077 update_changeattr(dir, &res.cinfo);
2078 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2079 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2080 }
1da177e4
LT		 2081
2082 return status;
2083}
2084
2085static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2086{
2087 struct nfs4_exception exception = { };
2088 int err;
2089 do {
2090 err = nfs4_handle_exception(NFS_SERVER(inode),
2091 _nfs4_proc_link(inode, dir, name),
2092 &exception);
2093 } while (exception.retry);
2094 return err;
2095}
2096
4f390c15 2097static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2098 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2099{
2100 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 2101 struct nfs_fh fhandle;
2102 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2103 struct nfs4_create_arg arg = {
2104 .dir_fh = NFS_FH(dir),
2105 .server = server,
4f390c15 2106 .name = &dentry->d_name,
1da177e4
LT		 2107 .attrs = sattr,
2108 .ftype = NF4LNK,
2109 .bitmask = server->attr_bitmask,
2110 };
2111 struct nfs4_create_res res = {
2112 .server = server,
4f390c15
CL		 2113 .fh = &fhandle,
2114 .fattr = &fattr,
56ae19f3 2115 .dir_fattr = &dir_fattr,
1da177e4
LT		 2116 };
2117 struct rpc_message msg = {
2118 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2119 .rpc_argp = &arg,
2120 .rpc_resp = &res,
2121 };
2122 int status;
2123
94a6d753 2124 if (len > NFS4_MAXPATHLEN)
1da177e4 2125 return -ENAMETOOLONG;
4f390c15 2126
94a6d753
CL		 2127 arg.u.symlink.pages = &page;
2128 arg.u.symlink.len = len;
4f390c15 2129 nfs_fattr_init(&fattr);
56ae19f3 2130 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2131
2132 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2133 if (!status) {
1da177e4 2134 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2135 nfs_post_op_update_inode(dir, res.dir_fattr);
2136 status = nfs_instantiate(dentry, &fhandle, &fattr);
2137 }
1da177e4
LT		 2138 return status;
2139}
2140
4f390c15 2141static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2142 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2143{
2144 struct nfs4_exception exception = { };
2145 int err;
2146 do {
2147 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2148 _nfs4_proc_symlink(dir, dentry, page,
2149 len, sattr),
1da177e4
LT		 2150 &exception);
2151 } while (exception.retry);
2152 return err;
2153}
2154
2155static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2156 struct iattr *sattr)
2157{
2158 struct nfs_server *server = NFS_SERVER(dir);
2159 struct nfs_fh fhandle;
56ae19f3 2160 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2161 struct nfs4_create_arg arg = {
2162 .dir_fh = NFS_FH(dir),
2163 .server = server,
2164 .name = &dentry->d_name,
2165 .attrs = sattr,
2166 .ftype = NF4DIR,
2167 .bitmask = server->attr_bitmask,
2168 };
2169 struct nfs4_create_res res = {
2170 .server = server,
2171 .fh = &fhandle,
2172 .fattr = &fattr,
56ae19f3 2173 .dir_fattr = &dir_fattr,
1da177e4
LT		 2174 };
2175 struct rpc_message msg = {
2176 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2177 .rpc_argp = &arg,
2178 .rpc_resp = &res,
2179 };
2180 int status;
2181
0e574af1 2182 nfs_fattr_init(&fattr);
56ae19f3 2183 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2184
2185 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2186 if (!status) {
2187 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2188 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2189 status = nfs_instantiate(dentry, &fhandle, &fattr);
2190 }
2191 return status;
2192}
2193
2194static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2195 struct iattr *sattr)
2196{
2197 struct nfs4_exception exception = { };
2198 int err;
2199 do {
2200 err = nfs4_handle_exception(NFS_SERVER(dir),
2201 _nfs4_proc_mkdir(dir, dentry, sattr),
2202 &exception);
2203 } while (exception.retry);
2204 return err;
2205}
2206
2207static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2208 u64 cookie, struct page *page, unsigned int count, int plus)
2209{
2210 struct inode *dir = dentry->d_inode;
2211 struct nfs4_readdir_arg args = {
2212 .fh = NFS_FH(dir),
2213 .pages = &page,
2214 .pgbase = 0,
2215 .count = count,
2216 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2217 };
2218 struct nfs4_readdir_res res;
2219 struct rpc_message msg = {
2220 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2221 .rpc_argp = &args,
2222 .rpc_resp = &res,
2223 .rpc_cred = cred,
2224 };
2225 int status;
2226
eadf4598
TM		 2227 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2228 dentry->d_parent->d_name.name,
2229 dentry->d_name.name,
2230 (unsigned long long)cookie);
1da177e4
LT		 2231 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2232 res.pgbase = args.pgbase;
2233 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2234 if (status == 0)
2235 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
eadf4598 2236 dprintk("%s: returns %d\n", __FUNCTION__, 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{
2257 struct nfs_server *server = NFS_SERVER(dir);
2258 struct nfs_fh fh;
56ae19f3 2259 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2260 struct nfs4_create_arg arg = {
2261 .dir_fh = NFS_FH(dir),
2262 .server = server,
2263 .name = &dentry->d_name,
2264 .attrs = sattr,
2265 .bitmask = server->attr_bitmask,
2266 };
2267 struct nfs4_create_res res = {
2268 .server = server,
2269 .fh = &fh,
2270 .fattr = &fattr,
56ae19f3 2271 .dir_fattr = &dir_fattr,
1da177e4
LT		 2272 };
2273 struct rpc_message msg = {
2274 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2275 .rpc_argp = &arg,
2276 .rpc_resp = &res,
2277 };
2278 int status;
2279 int mode = sattr->ia_mode;
2280
0e574af1 2281 nfs_fattr_init(&fattr);
56ae19f3 2282 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2283
2284 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2285 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2286 if (S_ISFIFO(mode))
2287 arg.ftype = NF4FIFO;
2288 else if (S_ISBLK(mode)) {
2289 arg.ftype = NF4BLK;
2290 arg.u.device.specdata1 = MAJOR(rdev);
2291 arg.u.device.specdata2 = MINOR(rdev);
2292 }
2293 else if (S_ISCHR(mode)) {
2294 arg.ftype = NF4CHR;
2295 arg.u.device.specdata1 = MAJOR(rdev);
2296 arg.u.device.specdata2 = MINOR(rdev);
2297 }
2298 else
2299 arg.ftype = NF4SOCK;
2300
2301 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2302 if (status == 0) {
2303 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2304 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2305 status = nfs_instantiate(dentry, &fh, &fattr);
2306 }
2307 return status;
2308}
2309
2310static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2311 struct iattr *sattr, dev_t rdev)
2312{
2313 struct nfs4_exception exception = { };
2314 int err;
2315 do {
2316 err = nfs4_handle_exception(NFS_SERVER(dir),
2317 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2318 &exception);
2319 } while (exception.retry);
2320 return err;
2321}
2322
2323static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2324 struct nfs_fsstat *fsstat)
2325{
2326 struct nfs4_statfs_arg args = {
2327 .fh = fhandle,
2328 .bitmask = server->attr_bitmask,
2329 };
2330 struct rpc_message msg = {
2331 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2332 .rpc_argp = &args,
2333 .rpc_resp = fsstat,
2334 };
2335
0e574af1 2336 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2337 return rpc_call_sync(server->client, &msg, 0);
2338}
2339
2340static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2341{
2342 struct nfs4_exception exception = { };
2343 int err;
2344 do {
2345 err = nfs4_handle_exception(server,
2346 _nfs4_proc_statfs(server, fhandle, fsstat),
2347 &exception);
2348 } while (exception.retry);
2349 return err;
2350}
2351
2352static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2353 struct nfs_fsinfo *fsinfo)
2354{
2355 struct nfs4_fsinfo_arg args = {
2356 .fh = fhandle,
2357 .bitmask = server->attr_bitmask,
2358 };
2359 struct rpc_message msg = {
2360 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2361 .rpc_argp = &args,
2362 .rpc_resp = fsinfo,
2363 };
2364
2365 return rpc_call_sync(server->client, &msg, 0);
2366}
2367
2368static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2369{
2370 struct nfs4_exception exception = { };
2371 int err;
2372
2373 do {
2374 err = nfs4_handle_exception(server,
2375 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2376 &exception);
2377 } while (exception.retry);
2378 return err;
2379}
2380
2381static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2382{
0e574af1 2383 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2384 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2385}
2386
2387static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2388 struct nfs_pathconf *pathconf)
2389{
2390 struct nfs4_pathconf_arg args = {
2391 .fh = fhandle,
2392 .bitmask = server->attr_bitmask,
2393 };
2394 struct rpc_message msg = {
2395 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2396 .rpc_argp = &args,
2397 .rpc_resp = pathconf,
2398 };
2399
2400 /* None of the pathconf attributes are mandatory to implement */
2401 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2402 memset(pathconf, 0, sizeof(*pathconf));
2403 return 0;
2404 }
2405
0e574af1 2406 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2407 return rpc_call_sync(server->client, &msg, 0);
2408}
2409
2410static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2411 struct nfs_pathconf *pathconf)
2412{
2413 struct nfs4_exception exception = { };
2414 int err;
2415
2416 do {
2417 err = nfs4_handle_exception(server,
2418 _nfs4_proc_pathconf(server, fhandle, pathconf),
2419 &exception);
2420 } while (exception.retry);
2421 return err;
2422}
2423
ec06c096 2424static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2425{
ec06c096 2426 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2427
ec06c096 2428 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2429 rpc_restart_call(task);
ec06c096 2430 return -EAGAIN;
1da177e4
LT		 2431 }
2432 if (task->tk_status > 0)
ec06c096
TM		 2433 renew_lease(server, data->timestamp);
2434 return 0;
1da177e4
LT		 2435}
2436
ec06c096 2437static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2438{
1da177e4
LT		 2439 struct rpc_message msg = {
2440 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2441 .rpc_argp = &data->args,
2442 .rpc_resp = &data->res,
2443 .rpc_cred = data->cred,
2444 };
1da177e4
LT		 2445
2446 data->timestamp = jiffies;
2447
ec06c096 2448 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2449}
2450
788e7a89 2451static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2452{
1da177e4
LT		 2453 struct inode *inode = data->inode;
2454
2455 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2456 rpc_restart_call(task);
788e7a89 2457 return -EAGAIN;
1da177e4 2458 }
4f9838c7 2459 if (task->tk_status >= 0) {
1da177e4 2460 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2461 nfs_post_op_update_inode(inode, data->res.fattr);
2462 }
788e7a89 2463 return 0;
1da177e4
LT		 2464}
2465
788e7a89 2466static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2467{
1da177e4
LT		 2468 struct rpc_message msg = {
2469 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2470 .rpc_argp = &data->args,
2471 .rpc_resp = &data->res,
2472 .rpc_cred = data->cred,
2473 };
2474 struct inode *inode = data->inode;
4f9838c7 2475 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2476 int stable;
1da177e4
LT		 2477
2478 if (how & FLUSH_STABLE) {
2479 if (!NFS_I(inode)->ncommit)
2480 stable = NFS_FILE_SYNC;
2481 else
2482 stable = NFS_DATA_SYNC;
2483 } else
2484 stable = NFS_UNSTABLE;
2485 data->args.stable = stable;
4f9838c7
TM		 2486 data->args.bitmask = server->attr_bitmask;
2487 data->res.server = server;
1da177e4
LT		 2488
2489 data->timestamp = jiffies;
2490
1da177e4 2491 /* Finalize the task. */
788e7a89 2492 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2493}
2494
788e7a89 2495static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2496{
1da177e4
LT		 2497 struct inode *inode = data->inode;
2498
2499 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2500 rpc_restart_call(task);
788e7a89 2501 return -EAGAIN;
1da177e4 2502 }
4f9838c7
TM		 2503 if (task->tk_status >= 0)
2504 nfs_post_op_update_inode(inode, data->res.fattr);
788e7a89 2505 return 0;
1da177e4
LT		 2506}
2507
788e7a89 2508static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2509{
1da177e4
LT		 2510 struct rpc_message msg = {
2511 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2512 .rpc_argp = &data->args,
2513 .rpc_resp = &data->res,
2514 .rpc_cred = data->cred,
2515 };
788e7a89 2516 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2517
4f9838c7
TM		 2518 data->args.bitmask = server->attr_bitmask;
2519 data->res.server = server;
2520
788e7a89 2521 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2522}
2523
2524/*
2525 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2526 * standalone procedure for queueing an asynchronous RENEW.
2527 */
963d8fe5 2528static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2529{
adfa6f98 2530 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2531 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2532
2533 if (task->tk_status < 0) {
2534 switch (task->tk_status) {
2535 case -NFS4ERR_STALE_CLIENTID:
2536 case -NFS4ERR_EXPIRED:
2537 case -NFS4ERR_CB_PATH_DOWN:
2538 nfs4_schedule_state_recovery(clp);
2539 }
2540 return;
2541 }
2542 spin_lock(&clp->cl_lock);
2543 if (time_before(clp->cl_last_renewal,timestamp))
2544 clp->cl_last_renewal = timestamp;
2545 spin_unlock(&clp->cl_lock);
2546}
2547
963d8fe5
TM		 2548static const struct rpc_call_ops nfs4_renew_ops = {
2549 .rpc_call_done = nfs4_renew_done,
2550};
2551
adfa6f98 2552int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2553{
2554 struct rpc_message msg = {
2555 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2556 .rpc_argp = clp,
b4454fe1 2557 .rpc_cred = cred,
1da177e4
LT		 2558 };
2559
2560 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2561 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2562}
2563
adfa6f98 2564int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2565{
2566 struct rpc_message msg = {
2567 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2568 .rpc_argp = clp,
b4454fe1 2569 .rpc_cred = cred,
1da177e4
LT		 2570 };
2571 unsigned long now = jiffies;
2572 int status;
2573
2574 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2575 if (status < 0)
2576 return status;
2577 spin_lock(&clp->cl_lock);
2578 if (time_before(clp->cl_last_renewal,now))
2579 clp->cl_last_renewal = now;
2580 spin_unlock(&clp->cl_lock);
2581 return 0;
2582}
2583
aa1870af
BF		 2584static inline int nfs4_server_supports_acls(struct nfs_server *server)
2585{
2586 return (server->caps & NFS_CAP_ACLS)
2587 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2588 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2589}
2590
2591/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2592 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2593 * the stack.
2594 */
2595#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2596
2597static void buf_to_pages(const void *buf, size_t buflen,
2598 struct page **pages, unsigned int *pgbase)
2599{
2600 const void *p = buf;
2601
2602 *pgbase = offset_in_page(buf);
2603 p -= *pgbase;
2604 while (p < buf + buflen) {
2605 *(pages++) = virt_to_page(p);
2606 p += PAGE_CACHE_SIZE;
2607 }
2608}
2609
e50a1c2e
BF		 2610struct nfs4_cached_acl {
2611 int cached;
2612 size_t len;
3e9d4154 2613 char data[0];
e50a1c2e
BF		 2614};
2615
2616static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2617{
2618 struct nfs_inode *nfsi = NFS_I(inode);
2619
2620 spin_lock(&inode->i_lock);
2621 kfree(nfsi->nfs4_acl);
2622 nfsi->nfs4_acl = acl;
2623 spin_unlock(&inode->i_lock);
2624}
2625
2626static void nfs4_zap_acl_attr(struct inode *inode)
2627{
2628 nfs4_set_cached_acl(inode, NULL);
2629}
2630
2631static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2632{
2633 struct nfs_inode *nfsi = NFS_I(inode);
2634 struct nfs4_cached_acl *acl;
2635 int ret = -ENOENT;
2636
2637 spin_lock(&inode->i_lock);
2638 acl = nfsi->nfs4_acl;
2639 if (acl == NULL)
2640 goto out;
2641 if (buf == NULL) /* user is just asking for length */
2642 goto out_len;
2643 if (acl->cached == 0)
2644 goto out;
2645 ret = -ERANGE; /* see getxattr(2) man page */
2646 if (acl->len > buflen)
2647 goto out;
2648 memcpy(buf, acl->data, acl->len);
2649out_len:
2650 ret = acl->len;
2651out:
2652 spin_unlock(&inode->i_lock);
2653 return ret;
2654}
2655
2656static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2657{
2658 struct nfs4_cached_acl *acl;
2659
2660 if (buf && acl_len <= PAGE_SIZE) {
2661 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2662 if (acl == NULL)
2663 goto out;
2664 acl->cached = 1;
2665 memcpy(acl->data, buf, acl_len);
2666 } else {
2667 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2668 if (acl == NULL)
2669 goto out;
2670 acl->cached = 0;
2671 }
2672 acl->len = acl_len;
2673out:
2674 nfs4_set_cached_acl(inode, acl);
2675}
2676
16b4289c 2677static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2678{
aa1870af
BF		 2679 struct page *pages[NFS4ACL_MAXPAGES];
2680 struct nfs_getaclargs args = {
2681 .fh = NFS_FH(inode),
2682 .acl_pages = pages,
2683 .acl_len = buflen,
2684 };
2685 size_t resp_len = buflen;
e50a1c2e 2686 void *resp_buf;
aa1870af
BF		 2687 struct rpc_message msg = {
2688 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2689 .rpc_argp = &args,
2690 .rpc_resp = &resp_len,
2691 };
e50a1c2e 2692 struct page *localpage = NULL;
aa1870af
BF		 2693 int ret;
2694
e50a1c2e
BF		 2695 if (buflen < PAGE_SIZE) {
2696 /* As long as we're doing a round trip to the server anyway,
2697 * let's be prepared for a page of acl data. */
2698 localpage = alloc_page(GFP_KERNEL);
2699 resp_buf = page_address(localpage);
2700 if (localpage == NULL)
2701 return -ENOMEM;
2702 args.acl_pages[0] = localpage;
2703 args.acl_pgbase = 0;
1d95db8e 2704 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2705 } else {
2706 resp_buf = buf;
2707 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2708 }
aa1870af 2709 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2710 if (ret)
2711 goto out_free;
2712 if (resp_len > args.acl_len)
2713 nfs4_write_cached_acl(inode, NULL, resp_len);
2714 else
2715 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2716 if (buf) {
2717 ret = -ERANGE;
2718 if (resp_len > buflen)
2719 goto out_free;
2720 if (localpage)
2721 memcpy(buf, resp_buf, resp_len);
2722 }
2723 ret = resp_len;
2724out_free:
2725 if (localpage)
2726 __free_page(localpage);
aa1870af
BF		 2727 return ret;
2728}
2729
16b4289c
TM		 2730static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2731{
2732 struct nfs4_exception exception = { };
2733 ssize_t ret;
2734 do {
2735 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2736 if (ret >= 0)
2737 break;
2738 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2739 } while (exception.retry);
2740 return ret;
2741}
2742
e50a1c2e
BF		 2743static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2744{
2745 struct nfs_server *server = NFS_SERVER(inode);
2746 int ret;
2747
2748 if (!nfs4_server_supports_acls(server))
2749 return -EOPNOTSUPP;
2750 ret = nfs_revalidate_inode(server, inode);
2751 if (ret < 0)
2752 return ret;
2753 ret = nfs4_read_cached_acl(inode, buf, buflen);
2754 if (ret != -ENOENT)
2755 return ret;
2756 return nfs4_get_acl_uncached(inode, buf, buflen);
2757}
2758
16b4289c 2759static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2760{
2761 struct nfs_server *server = NFS_SERVER(inode);
2762 struct page *pages[NFS4ACL_MAXPAGES];
2763 struct nfs_setaclargs arg = {
2764 .fh = NFS_FH(inode),
2765 .acl_pages = pages,
2766 .acl_len = buflen,
2767 };
2768 struct rpc_message msg = {
2769 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2770 .rpc_argp = &arg,
2771 .rpc_resp = NULL,
2772 };
2773 int ret;
2774
2775 if (!nfs4_server_supports_acls(server))
2776 return -EOPNOTSUPP;
642ac549 2777 nfs_inode_return_delegation(inode);
4b580ee3 2778 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2779 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
08efa202 2780 nfs_zap_caches(inode);
4b580ee3
BF		 2781 return ret;
2782}
2783
16b4289c
TM		 2784static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2785{
2786 struct nfs4_exception exception = { };
2787 int err;
2788 do {
2789 err = nfs4_handle_exception(NFS_SERVER(inode),
2790 __nfs4_proc_set_acl(inode, buf, buflen),
2791 &exception);
2792 } while (exception.retry);
2793 return err;
2794}
2795
1da177e4 2796static int
faf5f49c 2797nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2798{
7539bbab 2799 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2800
2801 if (!clp || task->tk_status >= 0)
2802 return 0;
2803 switch(task->tk_status) {
2804 case -NFS4ERR_STALE_CLIENTID:
2805 case -NFS4ERR_STALE_STATEID:
2806 case -NFS4ERR_EXPIRED:
2807 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2808 nfs4_schedule_state_recovery(clp);
433fbe4c 2809 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2810 rpc_wake_up_task(task);
2811 task->tk_status = 0;
2812 return -EAGAIN;
1da177e4 2813 case -NFS4ERR_DELAY:
006ea73e
CL		 2814 nfs_inc_server_stats((struct nfs_server *) server,
2815 NFSIOS_DELAY);
2816 case -NFS4ERR_GRACE:
1da177e4
LT		 2817 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2818 task->tk_status = 0;
2819 return -EAGAIN;
2820 case -NFS4ERR_OLD_STATEID:
2821 task->tk_status = 0;
2822 return -EAGAIN;
2823 }
2824 task->tk_status = nfs4_map_errors(task->tk_status);
2825 return 0;
2826}
2827
433fbe4c
TM		 2828static int nfs4_wait_bit_interruptible(void *word)
2829{
2830 if (signal_pending(current))
2831 return -ERESTARTSYS;
2832 schedule();
2833 return 0;
2834}
2835
adfa6f98 2836static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2837{
1da177e4 2838 sigset_t oldset;
433fbe4c 2839 int res;
1da177e4
LT		 2840
2841 might_sleep();
2842
e148582e
TM		 2843 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2844
1da177e4 2845 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2846 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2847 nfs4_wait_bit_interruptible,
2848 TASK_INTERRUPTIBLE);
1da177e4 2849 rpc_clnt_sigunmask(clnt, &oldset);
e148582e
TM		 2850
2851 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2852 return res;
2853}
2854
2855static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2856{
2857 sigset_t oldset;
2858 int res = 0;
2859
2860 might_sleep();
2861
2862 if (*timeout <= 0)
2863 *timeout = NFS4_POLL_RETRY_MIN;
2864 if (*timeout > NFS4_POLL_RETRY_MAX)
2865 *timeout = NFS4_POLL_RETRY_MAX;
2866 rpc_clnt_sigmask(clnt, &oldset);
2867 if (clnt->cl_intr) {
041e0e3b 2868 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2869 if (signalled())
2870 res = -ERESTARTSYS;
041e0e3b
NA		 2871 } else
2872 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2873 rpc_clnt_sigunmask(clnt, &oldset);
2874 *timeout <<= 1;
2875 return res;
2876}
2877
2878/* This is the error handling routine for processes that are allowed
2879 * to sleep.
2880 */
10afec90 2881static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2882{
7539bbab 2883 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2884 int ret = errorcode;
2885
2886 exception->retry = 0;
2887 switch(errorcode) {
2888 case 0:
2889 return 0;
2890 case -NFS4ERR_STALE_CLIENTID:
2891 case -NFS4ERR_STALE_STATEID:
2892 case -NFS4ERR_EXPIRED:
433fbe4c 2893 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2894 ret = nfs4_wait_clnt_recover(server->client, clp);
2895 if (ret == 0)
2896 exception->retry = 1;
2897 break;
c514983d 2898 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2899 case -NFS4ERR_GRACE:
2900 case -NFS4ERR_DELAY:
2901 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2902 if (ret != 0)
2903 break;
1da177e4 2904 case -NFS4ERR_OLD_STATEID:
2c56617d 2905 exception->retry = 1;
1da177e4
LT		 2906 }
2907 /* We failed to handle the error */
2908 return nfs4_map_errors(ret);
2909}
2910
adfa6f98 2911int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2912{
2913 nfs4_verifier sc_verifier;
2914 struct nfs4_setclientid setclientid = {
2915 .sc_verifier = &sc_verifier,
2916 .sc_prog = program,
2917 };
2918 struct rpc_message msg = {
2919 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2920 .rpc_argp = &setclientid,
2921 .rpc_resp = clp,
286d7d6a 2922 .rpc_cred = cred,
1da177e4 2923 };
bc4785cd 2924 __be32 *p;
1da177e4
LT		 2925 int loop = 0;
2926 int status;
2927
bc4785cd 2928 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2929 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2930 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2931
2932 for(;;) {
2933 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2934 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2935 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2936 cred->cr_ops->cr_name,
1da177e4
LT		 2937 clp->cl_id_uniquifier);
2938 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2939 sizeof(setclientid.sc_netid), "tcp");
2940 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2941 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2942 clp->cl_ipaddr, port >> 8, port & 255);
2943
2944 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2945 if (status != -NFS4ERR_CLID_INUSE)
2946 break;
2947 if (signalled())
2948 break;
2949 if (loop++ & 1)
2950 ssleep(clp->cl_lease_time + 1);
2951 else
2952 if (++clp->cl_id_uniquifier == 0)
2953 break;
2954 }
2955 return status;
2956}
2957
adfa6f98 2958static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2959{
2960 struct nfs_fsinfo fsinfo;
2961 struct rpc_message msg = {
2962 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2963 .rpc_argp = clp,
2964 .rpc_resp = &fsinfo,
286d7d6a 2965 .rpc_cred = cred,
1da177e4
LT		 2966 };
2967 unsigned long now;
2968 int status;
2969
2970 now = jiffies;
2971 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2972 if (status == 0) {
2973 spin_lock(&clp->cl_lock);
2974 clp->cl_lease_time = fsinfo.lease_time * HZ;
2975 clp->cl_last_renewal = now;
58d9714a 2976 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2977 spin_unlock(&clp->cl_lock);
2978 }
2979 return status;
2980}
2981
adfa6f98 2982int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2983{
2984 long timeout;
2985 int err;
2986 do {
2987 err = _nfs4_proc_setclientid_confirm(clp, cred);
2988 switch (err) {
2989 case 0:
2990 return err;
2991 case -NFS4ERR_RESOURCE:
2992 /* The IBM lawyers misread another document! */
2993 case -NFS4ERR_DELAY:
2994 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2995 }
2996 } while (err == 0);
2997 return err;
2998}
2999
fe650407
TM		 3000struct nfs4_delegreturndata {
3001 struct nfs4_delegreturnargs args;
fa178f29 3002 struct nfs4_delegreturnres res;
fe650407
TM		 3003 struct nfs_fh fh;
3004 nfs4_stateid stateid;
3005 struct rpc_cred *cred;
26e976a8 3006 unsigned long timestamp;
fa178f29 3007 struct nfs_fattr fattr;
fe650407
TM		 3008 int rpc_status;
3009};
3010
3011static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 3012{
fe650407 3013 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 3014 struct rpc_message msg = {
3015 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 3016 .rpc_argp = &data->args,
fa178f29 3017 .rpc_resp = &data->res,
fe650407 3018 .rpc_cred = data->cred,
1da177e4 3019 };
fa178f29 3020 nfs_fattr_init(data->res.fattr);
fe650407
TM		 3021 rpc_call_setup(task, &msg, 0);
3022}
1da177e4 3023
fe650407
TM		 3024static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3025{
3026 struct nfs4_delegreturndata *data = calldata;
3027 data->rpc_status = task->tk_status;
26e976a8 3028 if (data->rpc_status == 0)
fa178f29 3029 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 3030}
3031
3032static void nfs4_delegreturn_release(void *calldata)
3033{
3034 struct nfs4_delegreturndata *data = calldata;
3035
3036 put_rpccred(data->cred);
3037 kfree(calldata);
3038}
3039
c8d149f3 3040static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 3041 .rpc_call_prepare = nfs4_delegreturn_prepare,
3042 .rpc_call_done = nfs4_delegreturn_done,
3043 .rpc_release = nfs4_delegreturn_release,
3044};
3045
3046static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3047{
3048 struct nfs4_delegreturndata *data;
fa178f29 3049 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 3050 struct rpc_task *task;
3051 int status;
3052
3053 data = kmalloc(sizeof(*data), GFP_KERNEL);
3054 if (data == NULL)
3055 return -ENOMEM;
3056 data->args.fhandle = &data->fh;
3057 data->args.stateid = &data->stateid;
fa178f29 3058 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3059 nfs_copy_fh(&data->fh, NFS_FH(inode));
3060 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3061 data->res.fattr = &data->fattr;
3062 data->res.server = server;
fe650407 3063 data->cred = get_rpccred(cred);
26e976a8 3064 data->timestamp = jiffies;
fe650407
TM		 3065 data->rpc_status = 0;
3066
3067 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 3068 if (IS_ERR(task))
fe650407 3069 return PTR_ERR(task);
fe650407 3070 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 3071 if (status == 0) {
fe650407 3072 status = data->rpc_status;
fa178f29
TM		 3073 if (status == 0)
3074 nfs_post_op_update_inode(inode, &data->fattr);
3075 }
e6b3c4db 3076 rpc_put_task(task);
fe650407 3077 return status;
1da177e4
LT		 3078}
3079
3080int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3081{
3082 struct nfs_server *server = NFS_SERVER(inode);
3083 struct nfs4_exception exception = { };
3084 int err;
3085 do {
3086 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3087 switch (err) {
3088 case -NFS4ERR_STALE_STATEID:
3089 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3090 case 0:
3091 return 0;
3092 }
3093 err = nfs4_handle_exception(server, err, &exception);
3094 } while (exception.retry);
3095 return err;
3096}
3097
3098#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3099#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3100
3101/*
3102 * sleep, with exponential backoff, and retry the LOCK operation.
3103 */
3104static unsigned long
3105nfs4_set_lock_task_retry(unsigned long timeout)
3106{
041e0e3b 3107 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3108 timeout <<= 1;
3109 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3110 return NFS4_LOCK_MAXTIMEOUT;
3111 return timeout;
3112}
3113
1da177e4
LT		 3114static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3115{
3116 struct inode *inode = state->inode;
3117 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3118 struct nfs_client *clp = server->nfs_client;
911d1aaf 3119 struct nfs_lockt_args arg = {
1da177e4 3120 .fh = NFS_FH(inode),
911d1aaf 3121 .fl = request,
1da177e4 3122 };
911d1aaf
TM		 3123 struct nfs_lockt_res res = {
3124 .denied = request,
1da177e4
LT		 3125 };
3126 struct rpc_message msg = {
3127 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3128 .rpc_argp = &arg,
3129 .rpc_resp = &res,
3130 .rpc_cred = state->owner->so_cred,
3131 };
1da177e4
LT		 3132 struct nfs4_lock_state *lsp;
3133 int status;
3134
3135 down_read(&clp->cl_sem);
911d1aaf 3136 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3137 status = nfs4_set_lock_state(state, request);
3138 if (status != 0)
3139 goto out;
3140 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3141 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3142 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3143 switch (status) {
3144 case 0:
3145 request->fl_type = F_UNLCK;
3146 break;
3147 case -NFS4ERR_DENIED:
3148 status = 0;
1da177e4 3149 }
70cc6487 3150 request->fl_ops->fl_release_private(request);
8d0a8a9d 3151out:
1da177e4
LT		 3152 up_read(&clp->cl_sem);
3153 return status;
3154}
3155
3156static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3157{
3158 struct nfs4_exception exception = { };
3159 int err;
3160
3161 do {
3162 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3163 _nfs4_proc_getlk(state, cmd, request),
3164 &exception);
3165 } while (exception.retry);
3166 return err;
3167}
3168
3169static int do_vfs_lock(struct file *file, struct file_lock *fl)
3170{
3171 int res = 0;
3172 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3173 case FL_POSIX:
3174 res = posix_lock_file_wait(file, fl);
3175 break;
3176 case FL_FLOCK:
3177 res = flock_lock_file_wait(file, fl);
3178 break;
3179 default:
3180 BUG();
3181 }
1da177e4
LT		 3182 return res;
3183}
3184
faf5f49c 3185struct nfs4_unlockdata {
911d1aaf
TM		 3186 struct nfs_locku_args arg;
3187 struct nfs_locku_res res;
faf5f49c
TM		 3188 struct nfs4_lock_state *lsp;
3189 struct nfs_open_context *ctx;
911d1aaf
TM		 3190 struct file_lock fl;
3191 const struct nfs_server *server;
26e976a8 3192 unsigned long timestamp;
faf5f49c
TM		 3193};
3194
911d1aaf
TM		 3195static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3196 struct nfs_open_context *ctx,
3197 struct nfs4_lock_state *lsp,
3198 struct nfs_seqid *seqid)
3199{
3200 struct nfs4_unlockdata *p;
3201 struct inode *inode = lsp->ls_state->inode;
3202
3203 p = kmalloc(sizeof(*p), GFP_KERNEL);
3204 if (p == NULL)
3205 return NULL;
3206 p->arg.fh = NFS_FH(inode);
3207 p->arg.fl = &p->fl;
3208 p->arg.seqid = seqid;
3209 p->arg.stateid = &lsp->ls_stateid;
3210 p->lsp = lsp;
3211 atomic_inc(&lsp->ls_count);
3212 /* Ensure we don't close file until we're done freeing locks! */
3213 p->ctx = get_nfs_open_context(ctx);
3214 memcpy(&p->fl, fl, sizeof(p->fl));
3215 p->server = NFS_SERVER(inode);
3216 return p;
3217}
3218
06f814a3 3219static void nfs4_locku_release_calldata(void *data)
faf5f49c 3220{
963d8fe5 3221 struct nfs4_unlockdata *calldata = data;
911d1aaf 3222 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3223 nfs4_put_lock_state(calldata->lsp);
3224 put_nfs_open_context(calldata->ctx);
3225 kfree(calldata);
faf5f49c
TM		 3226}
3227
963d8fe5 3228static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3229{
963d8fe5 3230 struct nfs4_unlockdata *calldata = data;
faf5f49c 3231
06f814a3
TM		 3232 if (RPC_ASSASSINATED(task))
3233 return;
911d1aaf 3234 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3235 switch (task->tk_status) {
3236 case 0:
3237 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3238 calldata->res.stateid.data,
faf5f49c 3239 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3240 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3241 break;
3242 case -NFS4ERR_STALE_STATEID:
3243 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3244 break;
3245 default:
a6a352e9 3246 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3247 rpc_restart_call(task);
faf5f49c 3248 }
faf5f49c
TM		 3249}
3250
4ce70ada 3251static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3252{
4ce70ada 3253 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3254 struct rpc_message msg = {
3255 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3256 .rpc_argp = &calldata->arg,
3257 .rpc_resp = &calldata->res,
3258 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3259 };
faf5f49c 3260
911d1aaf 3261 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3262 return;
3263 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3264 /* Note: exit _without_ running nfs4_locku_done */
3265 task->tk_action = NULL;
faf5f49c
TM		 3266 return;
3267 }
26e976a8 3268 calldata->timestamp = jiffies;
faf5f49c
TM		 3269 rpc_call_setup(task, &msg, 0);
3270}
3271
963d8fe5 3272static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3273 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3274 .rpc_call_done = nfs4_locku_done,
06f814a3 3275 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3276};
3277
a5d16a4d
TM		 3278static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3279 struct nfs_open_context *ctx,
3280 struct nfs4_lock_state *lsp,
3281 struct nfs_seqid *seqid)
3282{
3283 struct nfs4_unlockdata *data;
a5d16a4d
TM		 3284
3285 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3286 if (data == NULL) {
3287 nfs_free_seqid(seqid);
3288 return ERR_PTR(-ENOMEM);
3289 }
3290
7a1218a2 3291 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3292}
3293
faf5f49c
TM		 3294static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3295{
911d1aaf 3296 struct nfs_seqid *seqid;
1da177e4 3297 struct nfs4_lock_state *lsp;
06f814a3
TM		 3298 struct rpc_task *task;
3299 int status = 0;
faf5f49c 3300
8d0a8a9d 3301 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3302 /* Unlock _before_ we do the RPC call */
3303 request->fl_flags |= FL_EXISTS;
3304 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3305 goto out;
8d0a8a9d 3306 if (status != 0)
9b073574
TM		 3307 goto out;
3308 /* Is this a delegated lock? */
3309 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3310 goto out;
8d0a8a9d 3311 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3312 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3313 status = -ENOMEM;
911d1aaf 3314 if (seqid == NULL)
9b073574 3315 goto out;
a5d16a4d
TM		 3316 task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3317 status = PTR_ERR(task);
3318 if (IS_ERR(task))
9b073574 3319 goto out;
a5d16a4d 3320 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3321 rpc_put_task(task);
9b073574 3322out:
1da177e4
LT		 3323 return status;
3324}
3325
a5d16a4d
TM		 3326struct nfs4_lockdata {
3327 struct nfs_lock_args arg;
3328 struct nfs_lock_res res;
3329 struct nfs4_lock_state *lsp;
3330 struct nfs_open_context *ctx;
3331 struct file_lock fl;
26e976a8 3332 unsigned long timestamp;
a5d16a4d
TM		 3333 int rpc_status;
3334 int cancelled;
3335};
3336
3337static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3338 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3339{
a5d16a4d
TM		 3340 struct nfs4_lockdata *p;
3341 struct inode *inode = lsp->ls_state->inode;
1da177e4 3342 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3343
3344 p = kzalloc(sizeof(*p), GFP_KERNEL);
3345 if (p == NULL)
3346 return NULL;
3347
3348 p->arg.fh = NFS_FH(inode);
3349 p->arg.fl = &p->fl;
3350 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3351 if (p->arg.lock_seqid == NULL)
3352 goto out_free;
3353 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3354 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3355 p->arg.lock_owner.id = lsp->ls_id.id;
a5d16a4d
TM		 3356 p->lsp = lsp;
3357 atomic_inc(&lsp->ls_count);
3358 p->ctx = get_nfs_open_context(ctx);
3359 memcpy(&p->fl, fl, sizeof(p->fl));
3360 return p;
3361out_free:
3362 kfree(p);
3363 return NULL;
3364}
3365
3366static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3367{
3368 struct nfs4_lockdata *data = calldata;
3369 struct nfs4_state *state = data->lsp->ls_state;
3370 struct nfs4_state_owner *sp = state->owner;
1da177e4 3371 struct rpc_message msg = {
a5d16a4d
TM		 3372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3373 .rpc_argp = &data->arg,
3374 .rpc_resp = &data->res,
3375 .rpc_cred = sp->so_cred,
1da177e4 3376 };
06735b34 3377
a5d16a4d
TM		 3378 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3379 return;
3380 dprintk("%s: begin!\n", __FUNCTION__);
3381 /* Do we need to do an open_to_lock_owner? */
3382 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3383 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3384 if (data->arg.open_seqid == NULL) {
3385 data->rpc_status = -ENOMEM;
3386 task->tk_action = NULL;
06735b34 3387 goto out;
8d0a8a9d 3388 }
a5d16a4d
TM		 3389 data->arg.open_stateid = &state->stateid;
3390 data->arg.new_lock_owner = 1;
3391 }
26e976a8 3392 data->timestamp = jiffies;
a5d16a4d 3393 rpc_call_setup(task, &msg, 0);
06735b34 3394out:
a5d16a4d
TM		 3395 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3396}
3397
3398static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3399{
3400 struct nfs4_lockdata *data = calldata;
3401
3402 dprintk("%s: begin!\n", __FUNCTION__);
3403
3404 data->rpc_status = task->tk_status;
3405 if (RPC_ASSASSINATED(task))
3406 goto out;
3407 if (data->arg.new_lock_owner != 0) {
3408 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3409 if (data->rpc_status == 0)
3410 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3411 else
3412 goto out;
3413 }
3414 if (data->rpc_status == 0) {
3415 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3416 sizeof(data->lsp->ls_stateid.data));
3417 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3418 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3419 }
3420 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3421out:
3422 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3423}
3424
3425static void nfs4_lock_release(void *calldata)
3426{
3427 struct nfs4_lockdata *data = calldata;
3428
3429 dprintk("%s: begin!\n", __FUNCTION__);
3430 if (data->arg.open_seqid != NULL)
3431 nfs_free_seqid(data->arg.open_seqid);
3432 if (data->cancelled != 0) {
3433 struct rpc_task *task;
3434 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3435 data->arg.lock_seqid);
3436 if (!IS_ERR(task))
e6b3c4db 3437 rpc_put_task(task);
a5d16a4d
TM		 3438 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3439 } else
3440 nfs_free_seqid(data->arg.lock_seqid);
3441 nfs4_put_lock_state(data->lsp);
3442 put_nfs_open_context(data->ctx);
3443 kfree(data);
3444 dprintk("%s: done!\n", __FUNCTION__);
3445}
3446
3447static const struct rpc_call_ops nfs4_lock_ops = {
3448 .rpc_call_prepare = nfs4_lock_prepare,
3449 .rpc_call_done = nfs4_lock_done,
3450 .rpc_release = nfs4_lock_release,
3451};
3452
3453static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3454{
3455 struct nfs4_lockdata *data;
3456 struct rpc_task *task;
3457 int ret;
3458
3459 dprintk("%s: begin!\n", __FUNCTION__);
3460 data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3461 fl->fl_u.nfs4_fl.owner);
3462 if (data == NULL)
3463 return -ENOMEM;
3464 if (IS_SETLKW(cmd))
3465 data->arg.block = 1;
3466 if (reclaim != 0)
3467 data->arg.reclaim = 1;
3468 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3469 &nfs4_lock_ops, data);
7a1218a2 3470 if (IS_ERR(task))
a5d16a4d 3471 return PTR_ERR(task);
a5d16a4d
TM		 3472 ret = nfs4_wait_for_completion_rpc_task(task);
3473 if (ret == 0) {
3474 ret = data->rpc_status;
3475 if (ret == -NFS4ERR_DENIED)
3476 ret = -EAGAIN;
3477 } else
3478 data->cancelled = 1;
e6b3c4db 3479 rpc_put_task(task);
a5d16a4d
TM		 3480 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3481 return ret;
1da177e4
LT		 3482}
3483
3484static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3485{
202b50dc
TM		 3486 struct nfs_server *server = NFS_SERVER(state->inode);
3487 struct nfs4_exception exception = { };
3488 int err;
3489
3490 do {
42a2d13e
TM		 3491 /* Cache the lock if possible... */
3492 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3493 return 0;
202b50dc
TM		 3494 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3495 if (err != -NFS4ERR_DELAY)
3496 break;
3497 nfs4_handle_exception(server, err, &exception);
3498 } while (exception.retry);
3499 return err;
1da177e4
LT		 3500}
3501
3502static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3503{
202b50dc
TM		 3504 struct nfs_server *server = NFS_SERVER(state->inode);
3505 struct nfs4_exception exception = { };
3506 int err;
3507
6bfc93ef
TM		 3508 err = nfs4_set_lock_state(state, request);
3509 if (err != 0)
3510 return err;
202b50dc 3511 do {
42a2d13e
TM		 3512 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3513 return 0;
202b50dc
TM		 3514 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3515 if (err != -NFS4ERR_DELAY)
3516 break;
3517 nfs4_handle_exception(server, err, &exception);
3518 } while (exception.retry);
3519 return err;
1da177e4
LT		 3520}
3521
3522static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3523{
adfa6f98 3524 struct nfs_client *clp = state->owner->so_client;
01c3b861 3525 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3526 int status;
3527
6bfc93ef 3528 /* Is this a delegated open? */
6bfc93ef
TM		 3529 status = nfs4_set_lock_state(state, request);
3530 if (status != 0)
3531 goto out;
01c3b861
TM		 3532 request->fl_flags |= FL_ACCESS;
3533 status = do_vfs_lock(request->fl_file, request);
3534 if (status < 0)
3535 goto out;
3536 down_read(&clp->cl_sem);
3537 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3538 struct nfs_inode *nfsi = NFS_I(state->inode);
3539 /* Yes: cache locks! */
3540 down_read(&nfsi->rwsem);
3541 /* ...but avoid races with delegation recall... */
3542 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3543 request->fl_flags = fl_flags & ~FL_SLEEP;
3544 status = do_vfs_lock(request->fl_file, request);
3545 up_read(&nfsi->rwsem);
3546 goto out_unlock;
3547 }
3548 up_read(&nfsi->rwsem);
3549 }
6bfc93ef
TM		 3550 status = _nfs4_do_setlk(state, cmd, request, 0);
3551 if (status != 0)
01c3b861 3552 goto out_unlock;
6bfc93ef 3553 /* Note: we always want to sleep here! */
01c3b861 3554 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3555 if (do_vfs_lock(request->fl_file, request) < 0)
3556 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3557out_unlock:
1da177e4 3558 up_read(&clp->cl_sem);
01c3b861
TM		 3559out:
3560 request->fl_flags = fl_flags;
1da177e4
LT		 3561 return status;
3562}
3563
3564static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3565{
3566 struct nfs4_exception exception = { };
3567 int err;
3568
3569 do {
3570 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3571 _nfs4_proc_setlk(state, cmd, request),
3572 &exception);
3573 } while (exception.retry);
3574 return err;
3575}
3576
3577static int
3578nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3579{
3580 struct nfs_open_context *ctx;
3581 struct nfs4_state *state;
3582 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3583 int status;
3584
3585 /* verify open state */
3586 ctx = (struct nfs_open_context *)filp->private_data;
3587 state = ctx->state;
3588
3589 if (request->fl_start < 0 || request->fl_end < 0)
3590 return -EINVAL;
3591
3592 if (IS_GETLK(cmd))
3593 return nfs4_proc_getlk(state, F_GETLK, request);
3594
3595 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3596 return -EINVAL;
3597
3598 if (request->fl_type == F_UNLCK)
3599 return nfs4_proc_unlck(state, cmd, request);
3600
3601 do {
3602 status = nfs4_proc_setlk(state, cmd, request);
3603 if ((status != -EAGAIN) || IS_SETLK(cmd))
3604 break;
3605 timeout = nfs4_set_lock_task_retry(timeout);
3606 status = -ERESTARTSYS;
3607 if (signalled())
3608 break;
3609 } while(status < 0);
1da177e4
LT		 3610 return status;
3611}
3612
888e694c
TM		 3613int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3614{
3615 struct nfs_server *server = NFS_SERVER(state->inode);
3616 struct nfs4_exception exception = { };
3617 int err;
3618
3619 err = nfs4_set_lock_state(state, fl);
3620 if (err != 0)
3621 goto out;
3622 do {
3623 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3624 if (err != -NFS4ERR_DELAY)
3625 break;
3626 err = nfs4_handle_exception(server, err, &exception);
3627 } while (exception.retry);
3628out:
3629 return err;
3630}
6b3b5496 3631
aa1870af
BF		 3632#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3633
6b3b5496
BF		 3634int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3635 size_t buflen, int flags)
3636{
4b580ee3
BF		 3637 struct inode *inode = dentry->d_inode;
3638
3639 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3640 return -EOPNOTSUPP;
3641
3642 if (!S_ISREG(inode->i_mode) &&
3643 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3644 return -EPERM;
3645
3646 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3647}
3648
3649/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3650 * and that's what we'll do for e.g. user attributes that haven't been set.
3651 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3652 * attributes in kernel-managed attribute namespaces. */
3653ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3654 size_t buflen)
3655{
aa1870af
BF		 3656 struct inode *inode = dentry->d_inode;
3657
3658 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3659 return -EOPNOTSUPP;
3660
3661 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3662}
3663
3664ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3665{
aa1870af 3666 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3667
096455a2
BF		 3668 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3669 return 0;
6b3b5496
BF		 3670 if (buf && buflen < len)
3671 return -ERANGE;
3672 if (buf)
aa1870af
BF		 3673 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3674 return len;
6b3b5496
BF		 3675}
3676
c228fd3a 3677int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
7aaa0b3b 3678 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3679{
3680 struct nfs_server *server = NFS_SERVER(dir);
3681 u32 bitmask[2] = {
361e624f
MN		 3682 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3683 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3684 };
3685 struct nfs4_fs_locations_arg args = {
3686 .dir_fh = NFS_FH(dir),
c228fd3a 3687 .name = name,
683b57b4
TM		 3688 .page = page,
3689 .bitmask = bitmask,
3690 };
3691 struct rpc_message msg = {
3692 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3693 .rpc_argp = &args,
7aaa0b3b 3694 .rpc_resp = fs_locations,
683b57b4
TM		 3695 };
3696 int status;
3697
3698 dprintk("%s: start\n", __FUNCTION__);
c228fd3a 3699 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3700 fs_locations->server = server;
830b8e33 3701 fs_locations->nlocations = 0;
683b57b4
TM		 3702 status = rpc_call_sync(server->client, &msg, 0);
3703 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3704 return status;
3705}
3706
1da177e4
LT		 3707struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3708 .recover_open = nfs4_open_reclaim,
3709 .recover_lock = nfs4_lock_reclaim,
3710};
3711
3712struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3713 .recover_open = nfs4_open_expired,
3714 .recover_lock = nfs4_lock_expired,
3715};
3716
92e1d5be 3717static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3718 .permission = nfs_permission,
3719 .getattr = nfs_getattr,
3720 .setattr = nfs_setattr,
3721 .getxattr = nfs4_getxattr,
3722 .setxattr = nfs4_setxattr,
3723 .listxattr = nfs4_listxattr,
3724};
3725
509de811 3726const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3727 .version = 4, /* protocol version */
3728 .dentry_ops = &nfs4_dentry_operations,
3729 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3730 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3731 .getroot = nfs4_proc_get_root,
3732 .getattr = nfs4_proc_getattr,
3733 .setattr = nfs4_proc_setattr,
2b3de441 3734 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3735 .lookup = nfs4_proc_lookup,
3736 .access = nfs4_proc_access,
3737 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3738 .create = nfs4_proc_create,
3739 .remove = nfs4_proc_remove,
3740 .unlink_setup = nfs4_proc_unlink_setup,
3741 .unlink_done = nfs4_proc_unlink_done,
3742 .rename = nfs4_proc_rename,
3743 .link = nfs4_proc_link,
3744 .symlink = nfs4_proc_symlink,
3745 .mkdir = nfs4_proc_mkdir,
3746 .rmdir = nfs4_proc_remove,
3747 .readdir = nfs4_proc_readdir,
3748 .mknod = nfs4_proc_mknod,
3749 .statfs = nfs4_proc_statfs,
3750 .fsinfo = nfs4_proc_fsinfo,
3751 .pathconf = nfs4_proc_pathconf,
e9326dca 3752 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3753 .decode_dirent = nfs4_decode_dirent,
3754 .read_setup = nfs4_proc_read_setup,
ec06c096 3755 .read_done = nfs4_read_done,
1da177e4 3756 .write_setup = nfs4_proc_write_setup,
788e7a89 3757 .write_done = nfs4_write_done,
1da177e4 3758 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3759 .commit_done = nfs4_commit_done,
02a913a7
TM		 3760 .file_open = nfs_open,
3761 .file_release = nfs_release,
1da177e4 3762 .lock = nfs4_proc_lock,
e50a1c2e 3763 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3764};
3765
3766/*
3767 * Local variables:
3768 * c-basic-offset: 8
3769 * End:
3770 */
Linux 6.x block layer and io_uring tree(s)