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NFS: Fix a race in sillyrename
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
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 *);
faf5f49c 65static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
adfa6f98 66static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
9936781d
TM		 67static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
68static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
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 */
4e769b93 178 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
1da177e4
LT		 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 */
4e769b93 190 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
1da177e4
LT		 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 210 spin_lock(&dir->i_lock);
40d24704
TM		 211 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
212 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
213 nfsi->cache_change_attribute = jiffies;
214 nfsi->change_attr = cinfo->after;
38478b24 215 spin_unlock(&dir->i_lock);
1da177e4
LT		 216}
217
e56e0b78 218struct nfs4_opendata {
c6d00e63 219 struct kref kref;
e56e0b78
TM		 220 struct nfs_openargs o_arg;
221 struct nfs_openres o_res;
cdd4e68b
TM		 222 struct nfs_open_confirmargs c_arg;
223 struct nfs_open_confirmres c_res;
e56e0b78
TM		 224 struct nfs_fattr f_attr;
225 struct nfs_fattr dir_attr;
ad389da7 226 struct path path;
e56e0b78
TM		 227 struct dentry *dir;
228 struct nfs4_state_owner *owner;
aac00a8d 229 struct nfs4_state *state;
e56e0b78 230 struct iattr attrs;
26e976a8 231 unsigned long timestamp;
3e309914 232 unsigned int rpc_done : 1;
24ac23ab
TM		 233 int rpc_status;
234 int cancelled;
e56e0b78
TM		 235};
236
2ced46c2
TM		 237
238static void nfs4_init_opendata_res(struct nfs4_opendata *p)
239{
240 p->o_res.f_attr = &p->f_attr;
241 p->o_res.dir_attr = &p->dir_attr;
242 p->o_res.server = p->o_arg.server;
243 nfs_fattr_init(&p->f_attr);
244 nfs_fattr_init(&p->dir_attr);
245}
246
ad389da7 247static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
e56e0b78
TM		 248 struct nfs4_state_owner *sp, int flags,
249 const struct iattr *attrs)
250{
ad389da7 251 struct dentry *parent = dget_parent(path->dentry);
e56e0b78
TM		 252 struct inode *dir = parent->d_inode;
253 struct nfs_server *server = NFS_SERVER(dir);
254 struct nfs4_opendata *p;
255
256 p = kzalloc(sizeof(*p), GFP_KERNEL);
257 if (p == NULL)
258 goto err;
259 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
260 if (p->o_arg.seqid == NULL)
261 goto err_free;
ad389da7
TM		 262 p->path.mnt = mntget(path->mnt);
263 p->path.dentry = dget(path->dentry);
e56e0b78
TM		 264 p->dir = parent;
265 p->owner = sp;
266 atomic_inc(&sp->so_count);
267 p->o_arg.fh = NFS_FH(dir);
268 p->o_arg.open_flags = flags,
7539bbab 269 p->o_arg.clientid = server->nfs_client->cl_clientid;
9f958ab8 270 p->o_arg.id = sp->so_owner_id.id;
ad389da7 271 p->o_arg.name = &p->path.dentry->d_name;
e56e0b78
TM		 272 p->o_arg.server = server;
273 p->o_arg.bitmask = server->attr_bitmask;
274 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
e56e0b78
TM		 275 if (flags & O_EXCL) {
276 u32 *s = (u32 *) p->o_arg.u.verifier.data;
277 s[0] = jiffies;
278 s[1] = current->pid;
279 } else if (flags & O_CREAT) {
280 p->o_arg.u.attrs = &p->attrs;
281 memcpy(&p->attrs, attrs, sizeof(p->attrs));
282 }
cdd4e68b
TM		 283 p->c_arg.fh = &p->o_res.fh;
284 p->c_arg.stateid = &p->o_res.stateid;
285 p->c_arg.seqid = p->o_arg.seqid;
2ced46c2 286 nfs4_init_opendata_res(p);
c6d00e63 287 kref_init(&p->kref);
e56e0b78
TM		 288 return p;
289err_free:
290 kfree(p);
291err:
292 dput(parent);
293 return NULL;
294}
295
c6d00e63 296static void nfs4_opendata_free(struct kref *kref)
e56e0b78 297{
c6d00e63
TM		 298 struct nfs4_opendata *p = container_of(kref,
299 struct nfs4_opendata, kref);
300
301 nfs_free_seqid(p->o_arg.seqid);
aac00a8d
TM		 302 if (p->state != NULL)
303 nfs4_put_open_state(p->state);
c6d00e63
TM		 304 nfs4_put_state_owner(p->owner);
305 dput(p->dir);
306 dput(p->path.dentry);
307 mntput(p->path.mnt);
308 kfree(p);
309}
310
311static void nfs4_opendata_put(struct nfs4_opendata *p)
312{
313 if (p != NULL)
314 kref_put(&p->kref, nfs4_opendata_free);
e56e0b78
TM		 315}
316
06f814a3
TM		 317static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
318{
319 sigset_t oldset;
320 int ret;
321
322 rpc_clnt_sigmask(task->tk_client, &oldset);
323 ret = rpc_wait_for_completion_task(task);
324 rpc_clnt_sigunmask(task->tk_client, &oldset);
325 return ret;
326}
327
6ee41268
TM		 328static int can_open_cached(struct nfs4_state *state, int mode)
329{
330 int ret = 0;
331 switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
332 case FMODE_READ:
333 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
6ee41268
TM		 334 break;
335 case FMODE_WRITE:
336 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
6ee41268
TM		 337 break;
338 case FMODE_READ|FMODE_WRITE:
339 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
340 }
341 return ret;
342}
343
aac00a8d
TM		 344static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
345{
346 if ((delegation->type & open_flags) != open_flags)
347 return 0;
348 if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
349 return 0;
350 return 1;
351}
352
003707c7 353static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
e7616923
TM		 354{
355 switch (open_flags) {
356 case FMODE_WRITE:
357 state->n_wronly++;
358 break;
359 case FMODE_READ:
360 state->n_rdonly++;
361 break;
362 case FMODE_READ|FMODE_WRITE:
363 state->n_rdwr++;
364 }
003707c7
TM		 365 nfs4_state_set_mode_locked(state, state->state | open_flags);
366}
367
368static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
369{
370 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
371 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
372 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
373 switch (open_flags) {
374 case FMODE_READ:
375 set_bit(NFS_O_RDONLY_STATE, &state->flags);
376 break;
377 case FMODE_WRITE:
378 set_bit(NFS_O_WRONLY_STATE, &state->flags);
379 break;
380 case FMODE_READ|FMODE_WRITE:
381 set_bit(NFS_O_RDWR_STATE, &state->flags);
382 }
e7616923
TM		 383}
384
003707c7
TM		 385static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
386{
8bda4e4c 387 write_seqlock(&state->seqlock);
003707c7 388 nfs_set_open_stateid_locked(state, stateid, open_flags);
8bda4e4c 389 write_sequnlock(&state->seqlock);
003707c7
TM		 390}
391
392static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
1da177e4 393{
1da177e4 394 open_flags &= (FMODE_READ|FMODE_WRITE);
8bda4e4c
TM		 395 /*
396 * Protect the call to nfs4_state_set_mode_locked and
397 * serialise the stateid update
398 */
399 write_seqlock(&state->seqlock);
003707c7
TM		 400 if (deleg_stateid != NULL) {
401 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
402 set_bit(NFS_DELEGATED_STATE, &state->flags);
403 }
404 if (open_stateid != NULL)
405 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
8bda4e4c
TM		 406 write_sequnlock(&state->seqlock);
407 spin_lock(&state->owner->so_lock);
e7616923 408 update_open_stateflags(state, open_flags);
ec073428 409 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 410}
411
aac00a8d
TM		 412static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
413{
414 struct nfs_delegation *delegation;
415
416 rcu_read_lock();
417 delegation = rcu_dereference(NFS_I(inode)->delegation);
418 if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
419 rcu_read_unlock();
420 return;
421 }
422 rcu_read_unlock();
423 nfs_inode_return_delegation(inode);
424}
425
6ee41268 426static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
aac00a8d
TM		 427{
428 struct nfs4_state *state = opendata->state;
429 struct nfs_inode *nfsi = NFS_I(state->inode);
430 struct nfs_delegation *delegation;
431 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
432 nfs4_stateid stateid;
433 int ret = -EAGAIN;
434
435 rcu_read_lock();
436 delegation = rcu_dereference(nfsi->delegation);
aac00a8d 437 for (;;) {
6ee41268
TM		 438 if (can_open_cached(state, open_mode)) {
439 spin_lock(&state->owner->so_lock);
440 if (can_open_cached(state, open_mode)) {
441 update_open_stateflags(state, open_mode);
442 spin_unlock(&state->owner->so_lock);
443 rcu_read_unlock();
444 goto out_return_state;
445 }
446 spin_unlock(&state->owner->so_lock);
447 }
448 if (delegation == NULL)
449 break;
aac00a8d
TM		 450 if (!can_open_delegated(delegation, open_mode))
451 break;
452 /* Save the delegation */
453 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
454 rcu_read_unlock();
455 lock_kernel();
af22f94a 456 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
aac00a8d
TM		 457 unlock_kernel();
458 if (ret != 0)
459 goto out;
460 ret = -EAGAIN;
461 rcu_read_lock();
462 delegation = rcu_dereference(nfsi->delegation);
6ee41268 463 /* If no delegation, try a cached open */
aac00a8d 464 if (delegation == NULL)
6ee41268 465 continue;
aac00a8d
TM		 466 /* Is the delegation still valid? */
467 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
468 continue;
469 rcu_read_unlock();
470 update_open_stateid(state, NULL, &stateid, open_mode);
471 goto out_return_state;
472 }
aac00a8d
TM		 473 rcu_read_unlock();
474out:
475 return ERR_PTR(ret);
476out_return_state:
477 atomic_inc(&state->count);
478 return state;
479}
480
24ac23ab
TM		 481static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
482{
483 struct inode *inode;
484 struct nfs4_state *state = NULL;
003707c7
TM		 485 struct nfs_delegation *delegation;
486 nfs4_stateid *deleg_stateid = NULL;
1b370bc2 487 int ret;
24ac23ab 488
aac00a8d 489 if (!data->rpc_done) {
6ee41268 490 state = nfs4_try_open_cached(data);
aac00a8d
TM		 491 goto out;
492 }
493
1b370bc2 494 ret = -EAGAIN;
24ac23ab 495 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1b370bc2 496 goto err;
24ac23ab 497 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1b370bc2 498 ret = PTR_ERR(inode);
03f28e3a 499 if (IS_ERR(inode))
1b370bc2
TM		 500 goto err;
501 ret = -ENOMEM;
24ac23ab
TM		 502 state = nfs4_get_open_state(inode, data->owner);
503 if (state == NULL)
1b370bc2 504 goto err_put_inode;
549d6ed5 505 if (data->o_res.delegation_type != 0) {
549d6ed5
TM		 506 int delegation_flags = 0;
507
003707c7
TM		 508 rcu_read_lock();
509 delegation = rcu_dereference(NFS_I(inode)->delegation);
510 if (delegation)
511 delegation_flags = delegation->flags;
512 rcu_read_unlock();
549d6ed5
TM		 513 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
514 nfs_inode_set_delegation(state->inode,
515 data->owner->so_cred,
516 &data->o_res);
517 else
518 nfs_inode_reclaim_delegation(state->inode,
519 data->owner->so_cred,
520 &data->o_res);
521 }
003707c7
TM		 522 rcu_read_lock();
523 delegation = rcu_dereference(NFS_I(inode)->delegation);
524 if (delegation != NULL)
525 deleg_stateid = &delegation->stateid;
526 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
527 rcu_read_unlock();
24ac23ab 528 iput(inode);
aac00a8d 529out:
24ac23ab 530 return state;
1b370bc2
TM		 531err_put_inode:
532 iput(inode);
533err:
534 return ERR_PTR(ret);
24ac23ab
TM		 535}
536
864472e9
TM		 537static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
538{
539 struct nfs_inode *nfsi = NFS_I(state->inode);
540 struct nfs_open_context *ctx;
541
542 spin_lock(&state->inode->i_lock);
543 list_for_each_entry(ctx, &nfsi->open_files, list) {
544 if (ctx->state != state)
545 continue;
546 get_nfs_open_context(ctx);
547 spin_unlock(&state->inode->i_lock);
548 return ctx;
549 }
550 spin_unlock(&state->inode->i_lock);
551 return ERR_PTR(-ENOENT);
552}
553
6f220ed5
TM		 554static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
555{
556 struct nfs4_opendata *opendata;
557
558 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
559 if (opendata == NULL)
560 return ERR_PTR(-ENOMEM);
561 opendata->state = state;
562 atomic_inc(&state->count);
563 return opendata;
564}
565
2ced46c2 566static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
864472e9 567{
2ced46c2 568 struct nfs4_state *newstate;
864472e9
TM		 569 int ret;
570
571 opendata->o_arg.open_flags = openflags;
2ced46c2
TM		 572 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
573 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
574 nfs4_init_opendata_res(opendata);
864472e9
TM		 575 ret = _nfs4_proc_open(opendata);
576 if (ret != 0)
577 return ret;
2ced46c2 578 newstate = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 579 if (IS_ERR(newstate))
580 return PTR_ERR(newstate);
581 nfs4_close_state(&opendata->path, newstate, openflags);
2ced46c2 582 *res = newstate;
864472e9
TM		 583 return 0;
584}
585
586static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
587{
864472e9 588 struct nfs4_state *newstate;
864472e9
TM		 589 int ret;
590
591 /* memory barrier prior to reading state->n_* */
2ced46c2 592 clear_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9
TM		 593 smp_rmb();
594 if (state->n_rdwr != 0) {
2ced46c2 595 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
864472e9
TM		 596 if (ret != 0)
597 return ret;
2ced46c2
TM		 598 if (newstate != state)
599 return -ESTALE;
864472e9
TM		 600 }
601 if (state->n_wronly != 0) {
2ced46c2 602 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
864472e9
TM		 603 if (ret != 0)
604 return ret;
2ced46c2
TM		 605 if (newstate != state)
606 return -ESTALE;
864472e9
TM		 607 }
608 if (state->n_rdonly != 0) {
2ced46c2 609 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
864472e9
TM		 610 if (ret != 0)
611 return ret;
2ced46c2
TM		 612 if (newstate != state)
613 return -ESTALE;
864472e9 614 }
1ac7e2fd
TM		 615 /*
616 * We may have performed cached opens for all three recoveries.
617 * Check if we need to update the current stateid.
618 */
619 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
620 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
8bda4e4c 621 write_seqlock(&state->seqlock);
1ac7e2fd
TM		 622 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
623 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
8bda4e4c 624 write_sequnlock(&state->seqlock);
1ac7e2fd 625 }
864472e9
TM		 626 return 0;
627}
628
1da177e4
LT		 629/*
630 * OPEN_RECLAIM:
631 * reclaim state on the server after a reboot.
1da177e4 632 */
539cd03a 633static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 634{
1ac7e2fd 635 struct nfs_delegation *delegation;
864472e9
TM		 636 struct nfs4_opendata *opendata;
637 int delegation_type = 0;
1da177e4
LT		 638 int status;
639
6f220ed5
TM		 640 opendata = nfs4_open_recoverdata_alloc(ctx, state);
641 if (IS_ERR(opendata))
642 return PTR_ERR(opendata);
864472e9
TM		 643 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
644 opendata->o_arg.fh = NFS_FH(state->inode);
1ac7e2fd
TM		 645 rcu_read_lock();
646 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
647 if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
65bbf6bd 648 delegation_type = delegation->type;
1ac7e2fd 649 rcu_read_unlock();
864472e9
TM		 650 opendata->o_arg.u.delegation_type = delegation_type;
651 status = nfs4_open_recover(opendata, state);
c6d00e63 652 nfs4_opendata_put(opendata);
1da177e4
LT		 653 return status;
654}
655
539cd03a 656static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 657{
658 struct nfs_server *server = NFS_SERVER(state->inode);
659 struct nfs4_exception exception = { };
660 int err;
661 do {
539cd03a 662 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 663 if (err != -NFS4ERR_DELAY)
664 break;
665 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 666 } while (exception.retry);
667 return err;
668}
669
864472e9
TM		 670static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
671{
672 struct nfs_open_context *ctx;
673 int ret;
674
675 ctx = nfs4_state_find_open_context(state);
676 if (IS_ERR(ctx))
677 return PTR_ERR(ctx);
539cd03a 678 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 679 put_nfs_open_context(ctx);
680 return ret;
681}
682
13437e12 683static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4 684{
e56e0b78 685 struct nfs4_opendata *opendata;
864472e9 686 int ret;
1da177e4 687
6f220ed5
TM		 688 opendata = nfs4_open_recoverdata_alloc(ctx, state);
689 if (IS_ERR(opendata))
690 return PTR_ERR(opendata);
e56e0b78 691 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
13437e12 692 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
e56e0b78 693 sizeof(opendata->o_arg.u.delegation.data));
864472e9 694 ret = nfs4_open_recover(opendata, state);
c6d00e63 695 nfs4_opendata_put(opendata);
864472e9 696 return ret;
1da177e4
LT		 697}
698
13437e12 699int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 700{
701 struct nfs4_exception exception = { };
539cd03a 702 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 703 int err;
704 do {
13437e12 705 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1da177e4
LT		 706 switch (err) {
707 case 0:
708 return err;
709 case -NFS4ERR_STALE_CLIENTID:
710 case -NFS4ERR_STALE_STATEID:
711 case -NFS4ERR_EXPIRED:
712 /* Don't recall a delegation if it was lost */
7539bbab 713 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 714 return err;
715 }
716 err = nfs4_handle_exception(server, err, &exception);
717 } while (exception.retry);
718 return err;
719}
720
cdd4e68b 721static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1da177e4 722{
cdd4e68b
TM		 723 struct nfs4_opendata *data = calldata;
724 struct rpc_message msg = {
725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
726 .rpc_argp = &data->c_arg,
727 .rpc_resp = &data->c_res,
728 .rpc_cred = data->owner->so_cred,
1da177e4 729 };
26e976a8 730 data->timestamp = jiffies;
cdd4e68b
TM		 731 rpc_call_setup(task, &msg, 0);
732}
733
734static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
735{
736 struct nfs4_opendata *data = calldata;
737
738 data->rpc_status = task->tk_status;
739 if (RPC_ASSASSINATED(task))
740 return;
26e976a8 741 if (data->rpc_status == 0) {
cdd4e68b
TM		 742 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
743 sizeof(data->o_res.stateid.data));
26e976a8 744 renew_lease(data->o_res.server, data->timestamp);
3e309914 745 data->rpc_done = 1;
26e976a8 746 }
cdd4e68b 747 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
0f9f95e0 748 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
cdd4e68b
TM		 749}
750
751static void nfs4_open_confirm_release(void *calldata)
752{
753 struct nfs4_opendata *data = calldata;
754 struct nfs4_state *state = NULL;
755
756 /* If this request hasn't been cancelled, do nothing */
757 if (data->cancelled == 0)
758 goto out_free;
759 /* In case of error, no cleanup! */
3e309914 760 if (!data->rpc_done)
cdd4e68b
TM		 761 goto out_free;
762 nfs_confirm_seqid(&data->owner->so_seqid, 0);
763 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 764 if (!IS_ERR(state))
4a35bd41 765 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 766out_free:
c6d00e63 767 nfs4_opendata_put(data);
cdd4e68b
TM		 768}
769
770static const struct rpc_call_ops nfs4_open_confirm_ops = {
771 .rpc_call_prepare = nfs4_open_confirm_prepare,
772 .rpc_call_done = nfs4_open_confirm_done,
773 .rpc_release = nfs4_open_confirm_release,
774};
775
776/*
777 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
778 */
779static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
780{
781 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
782 struct rpc_task *task;
1da177e4
LT		 783 int status;
784
c6d00e63 785 kref_get(&data->kref);
3e309914
TM		 786 data->rpc_done = 0;
787 data->rpc_status = 0;
cdd4e68b 788 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
7a1218a2 789 if (IS_ERR(task))
cdd4e68b 790 return PTR_ERR(task);
cdd4e68b
TM		 791 status = nfs4_wait_for_completion_rpc_task(task);
792 if (status != 0) {
793 data->cancelled = 1;
794 smp_wmb();
795 } else
796 status = data->rpc_status;
e6b3c4db 797 rpc_put_task(task);
1da177e4
LT		 798 return status;
799}
800
24ac23ab 801static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 802{
24ac23ab
TM		 803 struct nfs4_opendata *data = calldata;
804 struct nfs4_state_owner *sp = data->owner;
1da177e4
LT		 805 struct rpc_message msg = {
806 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
24ac23ab
TM		 807 .rpc_argp = &data->o_arg,
808 .rpc_resp = &data->o_res,
1da177e4
LT		 809 .rpc_cred = sp->so_cred,
810 };
24ac23ab
TM		 811
812 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
813 return;
aac00a8d
TM		 814 /*
815 * Check if we still need to send an OPEN call, or if we can use
816 * a delegation instead.
817 */
818 if (data->state != NULL) {
819 struct nfs_delegation *delegation;
820
6ee41268
TM		 821 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
822 goto out_no_action;
aac00a8d
TM		 823 rcu_read_lock();
824 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
825 if (delegation != NULL &&
826 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
827 rcu_read_unlock();
6ee41268 828 goto out_no_action;
aac00a8d
TM		 829 }
830 rcu_read_unlock();
831 }
24ac23ab 832 /* Update sequence id. */
9f958ab8 833 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 834 data->o_arg.clientid = sp->so_client->cl_clientid;
6f220ed5 835 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
864472e9 836 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
6f220ed5
TM		 837 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
838 }
26e976a8 839 data->timestamp = jiffies;
24ac23ab 840 rpc_call_setup(task, &msg, 0);
6ee41268
TM		 841 return;
842out_no_action:
843 task->tk_action = NULL;
844
24ac23ab 845}
1da177e4 846
24ac23ab
TM		 847static void nfs4_open_done(struct rpc_task *task, void *calldata)
848{
849 struct nfs4_opendata *data = calldata;
1da177e4 850
24ac23ab
TM		 851 data->rpc_status = task->tk_status;
852 if (RPC_ASSASSINATED(task))
853 return;
854 if (task->tk_status == 0) {
855 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 856 case S_IFREG:
857 break;
858 case S_IFLNK:
24ac23ab 859 data->rpc_status = -ELOOP;
6f926b5b
TM		 860 break;
861 case S_IFDIR:
24ac23ab 862 data->rpc_status = -EISDIR;
6f926b5b
TM		 863 break;
864 default:
24ac23ab 865 data->rpc_status = -ENOTDIR;
6f926b5b 866 }
26e976a8 867 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 868 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
869 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 870 }
24ac23ab 871 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
3e309914 872 data->rpc_done = 1;
24ac23ab 873}
6f926b5b 874
24ac23ab
TM		 875static void nfs4_open_release(void *calldata)
876{
877 struct nfs4_opendata *data = calldata;
878 struct nfs4_state *state = NULL;
879
880 /* If this request hasn't been cancelled, do nothing */
881 if (data->cancelled == 0)
882 goto out_free;
883 /* In case of error, no cleanup! */
3e309914 884 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 885 goto out_free;
886 /* In case we need an open_confirm, no cleanup! */
887 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
888 goto out_free;
889 nfs_confirm_seqid(&data->owner->so_seqid, 0);
890 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 891 if (!IS_ERR(state))
4a35bd41 892 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 893out_free:
c6d00e63 894 nfs4_opendata_put(data);
24ac23ab
TM		 895}
896
897static const struct rpc_call_ops nfs4_open_ops = {
898 .rpc_call_prepare = nfs4_open_prepare,
899 .rpc_call_done = nfs4_open_done,
900 .rpc_release = nfs4_open_release,
901};
902
903/*
904 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
905 */
906static int _nfs4_proc_open(struct nfs4_opendata *data)
907{
908 struct inode *dir = data->dir->d_inode;
909 struct nfs_server *server = NFS_SERVER(dir);
910 struct nfs_openargs *o_arg = &data->o_arg;
911 struct nfs_openres *o_res = &data->o_res;
912 struct rpc_task *task;
913 int status;
914
c6d00e63 915 kref_get(&data->kref);
3e309914
TM		 916 data->rpc_done = 0;
917 data->rpc_status = 0;
2ced46c2 918 data->cancelled = 0;
24ac23ab 919 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
7a1218a2 920 if (IS_ERR(task))
24ac23ab 921 return PTR_ERR(task);
24ac23ab
TM		 922 status = nfs4_wait_for_completion_rpc_task(task);
923 if (status != 0) {
924 data->cancelled = 1;
925 smp_wmb();
926 } else
927 status = data->rpc_status;
e6b3c4db 928 rpc_put_task(task);
3e309914 929 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 930 return status;
931
9936781d
TM		 932 if (o_res->fh.size == 0)
933 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
934
56ae19f3
TM		 935 if (o_arg->open_flags & O_CREAT) {
936 update_changeattr(dir, &o_res->cinfo);
937 nfs_post_op_update_inode(dir, o_res->dir_attr);
938 } else
939 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 940 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 941 status = _nfs4_proc_open_confirm(data);
1da177e4 942 if (status != 0)
24ac23ab 943 return status;
1da177e4
LT		 944 }
945 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
9936781d 946 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 947 return 0;
1da177e4
LT		 948}
949
10afec90 950static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 951{
7539bbab 952 struct nfs_client *clp = server->nfs_client;
6b30954e 953 int ret;
58d9714a 954
6b30954e
TM		 955 for (;;) {
956 ret = nfs4_wait_clnt_recover(server->client, clp);
957 if (ret != 0)
958 return ret;
959 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
960 break;
58d9714a 961 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 962 }
963 return 0;
58d9714a
TM		 964}
965
1da177e4
LT		 966/*
967 * OPEN_EXPIRED:
968 * reclaim state on the server after a network partition.
969 * Assumes caller holds the appropriate lock
970 */
539cd03a 971static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 972{
e56e0b78 973 struct nfs4_opendata *opendata;
864472e9 974 int ret;
1da177e4 975
6f220ed5
TM		 976 opendata = nfs4_open_recoverdata_alloc(ctx, state);
977 if (IS_ERR(opendata))
978 return PTR_ERR(opendata);
864472e9
TM		 979 ret = nfs4_open_recover(opendata, state);
980 if (ret == -ESTALE) {
981 /* Invalidate the state owner so we don't ever use it again */
539cd03a
TM		 982 nfs4_drop_state_owner(state->owner);
983 d_drop(ctx->path.dentry);
1da177e4 984 }
c6d00e63 985 nfs4_opendata_put(opendata);
864472e9 986 return ret;
1da177e4
LT		 987}
988
539cd03a 989static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 990{
539cd03a 991 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 992 struct nfs4_exception exception = { };
993 int err;
994
995 do {
539cd03a 996 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 997 if (err == -NFS4ERR_DELAY)
998 nfs4_handle_exception(server, err, &exception);
999 } while (exception.retry);
1000 return err;
1001}
1002
1da177e4
LT		 1003static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1004{
1da177e4 1005 struct nfs_open_context *ctx;
864472e9 1006 int ret;
1da177e4 1007
864472e9
TM		 1008 ctx = nfs4_state_find_open_context(state);
1009 if (IS_ERR(ctx))
1010 return PTR_ERR(ctx);
539cd03a 1011 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1012 put_nfs_open_context(ctx);
1013 return ret;
1da177e4
LT		 1014}
1015
aa53ed54
JL		 1016/*
1017 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1018 * fields corresponding to attributes that were used to store the verifier.
1019 * Make sure we clobber those fields in the later setattr call
1020 */
1021static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1022{
1023 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1024 !(sattr->ia_valid & ATTR_ATIME_SET))
1025 sattr->ia_valid |= ATTR_ATIME;
1026
1027 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1028 !(sattr->ia_valid & ATTR_MTIME_SET))
1029 sattr->ia_valid |= ATTR_MTIME;
1030}
1031
1da177e4 1032/*
24ac23ab 1033 * Returns a referenced nfs4_state
1da177e4 1034 */
ad389da7 1035static 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		 1036{
1037 struct nfs4_state_owner *sp;
1038 struct nfs4_state *state = NULL;
1039 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 1040 struct nfs_client *clp = server->nfs_client;
e56e0b78 1041 struct nfs4_opendata *opendata;
aac00a8d 1042 int status;
1da177e4
LT		 1043
1044 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1045 status = -ENOMEM;
1046 if (!(sp = nfs4_get_state_owner(server, cred))) {
1047 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1048 goto out_err;
1049 }
58d9714a
TM		 1050 status = nfs4_recover_expired_lease(server);
1051 if (status != 0)
b4454fe1 1052 goto err_put_state_owner;
aac00a8d
TM		 1053 if (path->dentry->d_inode != NULL)
1054 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a
TM		 1055 down_read(&clp->cl_sem);
1056 status = -ENOMEM;
ad389da7 1057 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1058 if (opendata == NULL)
76723de0 1059 goto err_release_rwsem;
1da177e4 1060
aac00a8d
TM		 1061 if (path->dentry->d_inode != NULL)
1062 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1063
24ac23ab 1064 status = _nfs4_proc_open(opendata);
1da177e4 1065 if (status != 0)
c6d00e63 1066 goto err_opendata_put;
1da177e4 1067
aa53ed54
JL		 1068 if (opendata->o_arg.open_flags & O_EXCL)
1069 nfs4_exclusive_attrset(opendata, sattr);
1070
24ac23ab 1071 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1072 status = PTR_ERR(state);
1073 if (IS_ERR(state))
c6d00e63 1074 goto err_opendata_put;
c6d00e63 1075 nfs4_opendata_put(opendata);
1da177e4
LT		 1076 nfs4_put_state_owner(sp);
1077 up_read(&clp->cl_sem);
1078 *res = state;
1079 return 0;
c6d00e63
TM		 1080err_opendata_put:
1081 nfs4_opendata_put(opendata);
76723de0
TM		 1082err_release_rwsem:
1083 up_read(&clp->cl_sem);
e56e0b78
TM		 1084err_put_state_owner:
1085 nfs4_put_state_owner(sp);
1da177e4 1086out_err:
1da177e4
LT		 1087 *res = NULL;
1088 return status;
1089}
1090
1091
ad389da7 1092static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1093{
1094 struct nfs4_exception exception = { };
1095 struct nfs4_state *res;
1096 int status;
1097
1098 do {
ad389da7 1099 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1100 if (status == 0)
1101 break;
1102 /* NOTE: BAD_SEQID means the server and client disagree about the
1103 * book-keeping w.r.t. state-changing operations
1104 * (OPEN/CLOSE/LOCK/LOCKU...)
1105 * It is actually a sign of a bug on the client or on the server.
1106 *
1107 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1108 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1109 * have unhashed the old state_owner for us, and that we can
1110 * therefore safely retry using a new one. We should still warn
1111 * the user though...
1112 */
1113 if (status == -NFS4ERR_BAD_SEQID) {
6f43ddcc
TM		 1114 printk(KERN_WARNING "NFS: v4 server %s "
1115 " returned a bad sequence-id error!\n",
1116 NFS_SERVER(dir)->nfs_client->cl_hostname);
1da177e4
LT		 1117 exception.retry = 1;
1118 continue;
1119 }
550f5747
TM		 1120 /*
1121 * BAD_STATEID on OPEN means that the server cancelled our
1122 * state before it received the OPEN_CONFIRM.
1123 * Recover by retrying the request as per the discussion
1124 * on Page 181 of RFC3530.
1125 */
1126 if (status == -NFS4ERR_BAD_STATEID) {
1127 exception.retry = 1;
1128 continue;
1129 }
aac00a8d
TM		 1130 if (status == -EAGAIN) {
1131 /* We must have found a delegation */
1132 exception.retry = 1;
1133 continue;
1134 }
1da177e4
LT		 1135 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1136 status, &exception));
1137 } while (exception.retry);
1138 return res;
1139}
1140
3e4f6290
TM		 1141static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1142 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1143{
3e4f6290 1144 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1145 struct nfs_setattrargs arg = {
3e4f6290 1146 .fh = NFS_FH(inode),
1da177e4
LT		 1147 .iap = sattr,
1148 .server = server,
1149 .bitmask = server->attr_bitmask,
1150 };
1151 struct nfs_setattrres res = {
1152 .fattr = fattr,
1153 .server = server,
1154 };
1155 struct rpc_message msg = {
1156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1157 .rpc_argp = &arg,
1158 .rpc_resp = &res,
1159 };
26e976a8 1160 unsigned long timestamp = jiffies;
65e4308d 1161 int status;
1da177e4 1162
0e574af1 1163 nfs_fattr_init(fattr);
1da177e4 1164
3e4f6290
TM		 1165 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1166 /* Use that stateid */
1167 } else if (state != NULL) {
1da177e4 1168 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1169 nfs4_copy_stateid(&arg.stateid, state, current->files);
1170 } else
1da177e4
LT		 1171 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1172
65e4308d 1173 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1174 if (status == 0 && state != NULL)
1175 renew_lease(server, timestamp);
65e4308d 1176 return status;
1da177e4
LT		 1177}
1178
3e4f6290
TM		 1179static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1180 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1181{
3e4f6290 1182 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1183 struct nfs4_exception exception = { };
1184 int err;
1185 do {
1186 err = nfs4_handle_exception(server,
3e4f6290 1187 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1188 &exception);
1189 } while (exception.retry);
1190 return err;
1191}
1192
1193struct nfs4_closedata {
4a35bd41 1194 struct path path;
1da177e4
LT		 1195 struct inode *inode;
1196 struct nfs4_state *state;
1197 struct nfs_closeargs arg;
1198 struct nfs_closeres res;
516a6af6 1199 struct nfs_fattr fattr;
26e976a8 1200 unsigned long timestamp;
1da177e4
LT		 1201};
1202
963d8fe5 1203static void nfs4_free_closedata(void *data)
9512135d 1204{
963d8fe5
TM		 1205 struct nfs4_closedata *calldata = data;
1206 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1207
1208 nfs4_put_open_state(calldata->state);
1209 nfs_free_seqid(calldata->arg.seqid);
9512135d 1210 nfs4_put_state_owner(sp);
4a35bd41
TM		 1211 dput(calldata->path.dentry);
1212 mntput(calldata->path.mnt);
9512135d
TM		 1213 kfree(calldata);
1214}
1215
963d8fe5 1216static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1217{
963d8fe5 1218 struct nfs4_closedata *calldata = data;
1da177e4 1219 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1220 struct nfs_server *server = NFS_SERVER(calldata->inode);
1221
4ce70ada
TM		 1222 if (RPC_ASSASSINATED(task))
1223 return;
1da177e4
LT		 1224 /* hmm. we are done with the inode, and in the process of freeing
1225 * the state_owner. we keep this around to process errors
1226 */
cee54fc9 1227 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1228 switch (task->tk_status) {
1229 case 0:
45328c35 1230 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
26e976a8 1231 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1232 break;
1233 case -NFS4ERR_STALE_STATEID:
1234 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1235 break;
1236 default:
1237 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1238 rpc_restart_call(task);
1239 return;
1240 }
1241 }
516a6af6 1242 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1243}
1244
4ce70ada 1245static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1246{
4ce70ada 1247 struct nfs4_closedata *calldata = data;
9512135d 1248 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1249 struct rpc_message msg = {
1250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1251 .rpc_argp = &calldata->arg,
1252 .rpc_resp = &calldata->res,
9512135d 1253 .rpc_cred = state->owner->so_cred,
1da177e4 1254 };
003707c7 1255 int clear_rd, clear_wr, clear_rdwr;
9512135d 1256
963d8fe5 1257 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1258 return;
003707c7 1259
003707c7 1260 clear_rd = clear_wr = clear_rdwr = 0;
4cecb76f 1261 spin_lock(&state->owner->so_lock);
003707c7 1262 /* Calculate the change in open mode */
e7616923 1263 if (state->n_rdwr == 0) {
003707c7 1264 if (state->n_rdonly == 0) {
003707c7
TM		 1265 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1266 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1267 }
1268 if (state->n_wronly == 0) {
003707c7
TM		 1269 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1270 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1271 }
e7616923 1272 }
4cecb76f 1273 spin_unlock(&state->owner->so_lock);
003707c7 1274 if (!clear_rd && !clear_wr && !clear_rdwr) {
963d8fe5
TM		 1275 /* Note: exit _without_ calling nfs4_close_done */
1276 task->tk_action = NULL;
9512135d
TM		 1277 return;
1278 }
516a6af6 1279 nfs_fattr_init(calldata->res.fattr);
45328c35 1280 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1da177e4 1281 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1282 calldata->arg.open_flags = FMODE_READ;
1283 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1284 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1285 calldata->arg.open_flags = FMODE_WRITE;
1286 }
26e976a8 1287 calldata->timestamp = jiffies;
9512135d 1288 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1289}
1290
963d8fe5 1291static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1292 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1293 .rpc_call_done = nfs4_close_done,
1294 .rpc_release = nfs4_free_closedata,
1295};
1296
1da177e4
LT		 1297/*
1298 * It is possible for data to be read/written from a mem-mapped file
1299 * after the sys_close call (which hits the vfs layer as a flush).
1300 * This means that we can't safely call nfsv4 close on a file until
1301 * the inode is cleared. This in turn means that we are not good
1302 * NFSv4 citizens - we do not indicate to the server to update the file's
1303 * share state even when we are done with one of the three share
1304 * stateid's in the inode.
1305 *
1306 * NOTE: Caller must be holding the sp->so_owner semaphore!
1307 */
4a35bd41 1308int nfs4_do_close(struct path *path, struct nfs4_state *state)
1da177e4 1309{
4a35bd41 1310 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4 1311 struct nfs4_closedata *calldata;
b39e625b
TM		 1312 struct nfs4_state_owner *sp = state->owner;
1313 struct rpc_task *task;
9512135d 1314 int status = -ENOMEM;
1da177e4 1315
9512135d 1316 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1317 if (calldata == NULL)
9512135d 1318 goto out;
4a35bd41 1319 calldata->inode = state->inode;
1da177e4 1320 calldata->state = state;
4a35bd41 1321 calldata->arg.fh = NFS_FH(state->inode);
003707c7 1322 calldata->arg.stateid = &state->open_stateid;
1da177e4 1323 /* Serialization for the sequence id */
cee54fc9 1324 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1325 if (calldata->arg.seqid == NULL)
1326 goto out_free_calldata;
516a6af6
TM		 1327 calldata->arg.bitmask = server->attr_bitmask;
1328 calldata->res.fattr = &calldata->fattr;
1329 calldata->res.server = server;
4a35bd41
TM		 1330 calldata->path.mnt = mntget(path->mnt);
1331 calldata->path.dentry = dget(path->dentry);
9512135d 1332
b39e625b
TM		 1333 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1334 if (IS_ERR(task))
1335 return PTR_ERR(task);
1336 rpc_put_task(task);
1337 return 0;
9512135d
TM		 1338out_free_calldata:
1339 kfree(calldata);
1340out:
b39e625b
TM		 1341 nfs4_put_open_state(state);
1342 nfs4_put_state_owner(sp);
9512135d 1343 return status;
1da177e4
LT		 1344}
1345
4a35bd41 1346static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
02a913a7
TM		 1347{
1348 struct file *filp;
1b45c46c 1349 int ret;
02a913a7 1350
1b45c46c
TM		 1351 /* If the open_intent is for execute, we have an extra check to make */
1352 if (nd->intent.open.flags & FMODE_EXEC) {
af22f94a 1353 ret = nfs_may_open(state->inode,
1b45c46c
TM		 1354 state->owner->so_cred,
1355 nd->intent.open.flags);
1356 if (ret < 0)
1357 goto out_close;
1358 }
4a35bd41 1359 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
02a913a7
TM		 1360 if (!IS_ERR(filp)) {
1361 struct nfs_open_context *ctx;
cd3758e3 1362 ctx = nfs_file_open_context(filp);
02a913a7 1363 ctx->state = state;
95cf959b
TM		 1364 return 0;
1365 }
1b45c46c
TM		 1366 ret = PTR_ERR(filp);
1367out_close:
4a35bd41 1368 nfs4_close_state(path, state, nd->intent.open.flags);
1b45c46c 1369 return ret;
02a913a7
TM		 1370}
1371
1372struct dentry *
1da177e4
LT		 1373nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1374{
565277f6 1375 struct dentry *parent;
ad389da7
TM		 1376 struct path path = {
1377 .mnt = nd->mnt,
1378 .dentry = dentry,
1379 };
1da177e4
LT		 1380 struct iattr attr;
1381 struct rpc_cred *cred;
1382 struct nfs4_state *state;
02a913a7 1383 struct dentry *res;
1da177e4
LT		 1384
1385 if (nd->flags & LOOKUP_CREATE) {
1386 attr.ia_mode = nd->intent.open.create_mode;
1387 attr.ia_valid = ATTR_MODE;
1388 if (!IS_POSIXACL(dir))
1389 attr.ia_mode &= ~current->fs->umask;
1390 } else {
1391 attr.ia_valid = 0;
1392 BUG_ON(nd->intent.open.flags & O_CREAT);
1393 }
1394
1f163415 1395 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1396 if (IS_ERR(cred))
02a913a7 1397 return (struct dentry *)cred;
565277f6
TM		 1398 parent = dentry->d_parent;
1399 /* Protect against concurrent sillydeletes */
1400 nfs_block_sillyrename(parent);
ad389da7 1401 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1402 put_rpccred(cred);
02a913a7 1403 if (IS_ERR(state)) {
d75340cc 1404 if (PTR_ERR(state) == -ENOENT) {
02a913a7 1405 d_add(dentry, NULL);
d75340cc
TM		 1406 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1407 }
565277f6 1408 nfs_unblock_sillyrename(parent);
02a913a7
TM		 1409 return (struct dentry *)state;
1410 }
24ac23ab 1411 res = d_add_unique(dentry, igrab(state->inode));
02a913a7 1412 if (res != NULL)
deee9369 1413 path.dentry = res;
d75340cc 1414 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
565277f6 1415 nfs_unblock_sillyrename(parent);
4a35bd41 1416 nfs4_intent_set_file(nd, &path, state);
02a913a7 1417 return res;
1da177e4
LT		 1418}
1419
1420int
02a913a7 1421nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1422{
ad389da7
TM		 1423 struct path path = {
1424 .mnt = nd->mnt,
1425 .dentry = dentry,
1426 };
1da177e4
LT		 1427 struct rpc_cred *cred;
1428 struct nfs4_state *state;
1da177e4 1429
1f163415 1430 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1431 if (IS_ERR(cred))
1432 return PTR_ERR(cred);
aac00a8d 1433 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1434 put_rpccred(cred);
02a913a7
TM		 1435 if (IS_ERR(state)) {
1436 switch (PTR_ERR(state)) {
1437 case -EPERM:
1438 case -EACCES:
1439 case -EDQUOT:
1440 case -ENOSPC:
1441 case -EROFS:
1442 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1443 return 1;
b87c0adf
CL		 1444 default:
1445 goto out_drop;
02a913a7 1446 }
02a913a7 1447 }
24ac23ab 1448 if (state->inode == dentry->d_inode) {
d75340cc 1449 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
4a35bd41 1450 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1451 return 1;
1452 }
4a35bd41 1453 nfs4_close_state(&path, state, openflags);
02a913a7
TM		 1454out_drop:
1455 d_drop(dentry);
1da177e4
LT		 1456 return 0;
1457}
1458
1459
1460static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1461{
1462 struct nfs4_server_caps_res res = {};
1463 struct rpc_message msg = {
1464 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1465 .rpc_argp = fhandle,
1466 .rpc_resp = &res,
1467 };
1468 int status;
1469
1470 status = rpc_call_sync(server->client, &msg, 0);
1471 if (status == 0) {
1472 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1473 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1474 server->caps |= NFS_CAP_ACLS;
1475 if (res.has_links != 0)
1476 server->caps |= NFS_CAP_HARDLINKS;
1477 if (res.has_symlinks != 0)
1478 server->caps |= NFS_CAP_SYMLINKS;
1479 server->acl_bitmask = res.acl_bitmask;
1480 }
1481 return status;
1482}
1483
55a97593 1484int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1485{
1486 struct nfs4_exception exception = { };
1487 int err;
1488 do {
1489 err = nfs4_handle_exception(server,
1490 _nfs4_server_capabilities(server, fhandle),
1491 &exception);
1492 } while (exception.retry);
1493 return err;
1494}
1495
1496static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1497 struct nfs_fsinfo *info)
1498{
1da177e4
LT		 1499 struct nfs4_lookup_root_arg args = {
1500 .bitmask = nfs4_fattr_bitmap,
1501 };
1502 struct nfs4_lookup_res res = {
1503 .server = server,
0e574af1 1504 .fattr = info->fattr,
1da177e4
LT		 1505 .fh = fhandle,
1506 };
1507 struct rpc_message msg = {
1508 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1509 .rpc_argp = &args,
1510 .rpc_resp = &res,
1511 };
0e574af1 1512 nfs_fattr_init(info->fattr);
1da177e4
LT		 1513 return rpc_call_sync(server->client, &msg, 0);
1514}
1515
1516static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1517 struct nfs_fsinfo *info)
1518{
1519 struct nfs4_exception exception = { };
1520 int err;
1521 do {
1522 err = nfs4_handle_exception(server,
1523 _nfs4_lookup_root(server, fhandle, info),
1524 &exception);
1525 } while (exception.retry);
1526 return err;
1527}
1528
54ceac45
DH		 1529/*
1530 * get the file handle for the "/" directory on the server
1531 */
1da177e4 1532static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1533 struct nfs_fsinfo *info)
1da177e4 1534{
1da177e4
LT		 1535 int status;
1536
1da177e4 1537 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1538 if (status == 0)
1539 status = nfs4_server_capabilities(server, fhandle);
1540 if (status == 0)
1541 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1542 return nfs4_map_errors(status);
1da177e4
LT		 1543}
1544
6b97fd3d
MN		 1545/*
1546 * Get locations and (maybe) other attributes of a referral.
1547 * Note that we'll actually follow the referral later when
1548 * we detect fsid mismatch in inode revalidation
1549 */
56659e99 1550static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
6b97fd3d
MN		 1551{
1552 int status = -ENOMEM;
1553 struct page *page = NULL;
1554 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1555
1556 page = alloc_page(GFP_KERNEL);
1557 if (page == NULL)
1558 goto out;
1559 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1560 if (locations == NULL)
1561 goto out;
1562
c228fd3a 1563 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1564 if (status != 0)
1565 goto out;
1566 /* Make sure server returned a different fsid for the referral */
1567 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1568 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1569 status = -EIO;
1570 goto out;
1571 }
1572
1573 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1574 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1575 if (!fattr->mode)
1576 fattr->mode = S_IFDIR;
1577 memset(fhandle, 0, sizeof(struct nfs_fh));
1578out:
1579 if (page)
1580 __free_page(page);
1581 if (locations)
1582 kfree(locations);
1583 return status;
1584}
1585
1da177e4
LT		 1586static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1587{
1588 struct nfs4_getattr_arg args = {
1589 .fh = fhandle,
1590 .bitmask = server->attr_bitmask,
1591 };
1592 struct nfs4_getattr_res res = {
1593 .fattr = fattr,
1594 .server = server,
1595 };
1596 struct rpc_message msg = {
1597 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1598 .rpc_argp = &args,
1599 .rpc_resp = &res,
1600 };
1601
0e574af1 1602 nfs_fattr_init(fattr);
1da177e4
LT		 1603 return rpc_call_sync(server->client, &msg, 0);
1604}
1605
1606static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1607{
1608 struct nfs4_exception exception = { };
1609 int err;
1610 do {
1611 err = nfs4_handle_exception(server,
1612 _nfs4_proc_getattr(server, fhandle, fattr),
1613 &exception);
1614 } while (exception.retry);
1615 return err;
1616}
1617
1618/*
1619 * The file is not closed if it is opened due to the a request to change
1620 * the size of the file. The open call will not be needed once the
1621 * VFS layer lookup-intents are implemented.
1622 *
1623 * Close is called when the inode is destroyed.
1624 * If we haven't opened the file for O_WRONLY, we
1625 * need to in the size_change case to obtain a stateid.
1626 *
1627 * Got race?
1628 * Because OPEN is always done by name in nfsv4, it is
1629 * possible that we opened a different file by the same
1630 * name. We can recognize this race condition, but we
1631 * can't do anything about it besides returning an error.
1632 *
1633 * This will be fixed with VFS changes (lookup-intent).
1634 */
1635static int
1636nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1637 struct iattr *sattr)
1638{
08e9eac4
TM		 1639 struct rpc_cred *cred;
1640 struct inode *inode = dentry->d_inode;
d530838b
TM		 1641 struct nfs_open_context *ctx;
1642 struct nfs4_state *state = NULL;
1da177e4
LT		 1643 int status;
1644
0e574af1 1645 nfs_fattr_init(fattr);
1da177e4 1646
1f163415 1647 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1648 if (IS_ERR(cred))
1649 return PTR_ERR(cred);
d530838b
TM		 1650
1651 /* Search for an existing open(O_WRITE) file */
1652 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1653 if (ctx != NULL)
1654 state = ctx->state;
08e9eac4 1655
3e4f6290 1656 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1657 if (status == 0)
1658 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1659 if (ctx != NULL)
1660 put_nfs_open_context(ctx);
08e9eac4 1661 put_rpccred(cred);
1da177e4
LT		 1662 return status;
1663}
1664
56659e99
TM		 1665static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1666 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1667 struct nfs_fattr *fattr)
1668{
1669 int status;
1670 struct nfs4_lookup_arg args = {
1671 .bitmask = server->attr_bitmask,
1672 .dir_fh = dirfh,
1673 .name = name,
1674 };
1675 struct nfs4_lookup_res res = {
1676 .server = server,
1677 .fattr = fattr,
1678 .fh = fhandle,
1679 };
1680 struct rpc_message msg = {
1681 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1682 .rpc_argp = &args,
1683 .rpc_resp = &res,
1684 };
1685
1686 nfs_fattr_init(fattr);
1687
1688 dprintk("NFS call lookupfh %s\n", name->name);
1689 status = rpc_call_sync(server->client, &msg, 0);
1690 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1691 return status;
1692}
1693
1694static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1695 struct qstr *name, struct nfs_fh *fhandle,
1696 struct nfs_fattr *fattr)
1697{
1698 struct nfs4_exception exception = { };
1699 int err;
1700 do {
4e56e082
TM		 1701 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1702 /* FIXME: !!!! */
1703 if (err == -NFS4ERR_MOVED) {
1704 err = -EREMOTE;
1705 break;
1706 }
1707 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1708 } while (exception.retry);
1709 return err;
1710}
1711
56659e99 1712static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1713 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1714{
4e56e082 1715 int status;
1da177e4
LT		 1716
1717 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1718 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1719 if (status == -NFS4ERR_MOVED)
1720 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1721 dprintk("NFS reply lookup: %d\n", status);
1722 return status;
1723}
1724
1725static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1726{
1727 struct nfs4_exception exception = { };
1728 int err;
1729 do {
1730 err = nfs4_handle_exception(NFS_SERVER(dir),
1731 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1732 &exception);
1733 } while (exception.retry);
1734 return err;
1735}
1736
1737static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1738{
76b32999
TM		 1739 struct nfs_server *server = NFS_SERVER(inode);
1740 struct nfs_fattr fattr;
1da177e4
LT		 1741 struct nfs4_accessargs args = {
1742 .fh = NFS_FH(inode),
76b32999
TM		 1743 .bitmask = server->attr_bitmask,
1744 };
1745 struct nfs4_accessres res = {
1746 .server = server,
1747 .fattr = &fattr,
1da177e4 1748 };
1da177e4
LT		 1749 struct rpc_message msg = {
1750 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1751 .rpc_argp = &args,
1752 .rpc_resp = &res,
1753 .rpc_cred = entry->cred,
1754 };
1755 int mode = entry->mask;
1756 int status;
1757
1758 /*
1759 * Determine which access bits we want to ask for...
1760 */
1761 if (mode & MAY_READ)
1762 args.access |= NFS4_ACCESS_READ;
1763 if (S_ISDIR(inode->i_mode)) {
1764 if (mode & MAY_WRITE)
1765 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1766 if (mode & MAY_EXEC)
1767 args.access |= NFS4_ACCESS_LOOKUP;
1768 } else {
1769 if (mode & MAY_WRITE)
1770 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1771 if (mode & MAY_EXEC)
1772 args.access |= NFS4_ACCESS_EXECUTE;
1773 }
76b32999 1774 nfs_fattr_init(&fattr);
1da177e4
LT		 1775 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1776 if (!status) {
1777 entry->mask = 0;
1778 if (res.access & NFS4_ACCESS_READ)
1779 entry->mask |= MAY_READ;
1780 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1781 entry->mask |= MAY_WRITE;
1782 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1783 entry->mask |= MAY_EXEC;
76b32999 1784 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1785 }
1786 return status;
1787}
1788
1789static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1790{
1791 struct nfs4_exception exception = { };
1792 int err;
1793 do {
1794 err = nfs4_handle_exception(NFS_SERVER(inode),
1795 _nfs4_proc_access(inode, entry),
1796 &exception);
1797 } while (exception.retry);
1798 return err;
1799}
1800
1801/*
1802 * TODO: For the time being, we don't try to get any attributes
1803 * along with any of the zero-copy operations READ, READDIR,
1804 * READLINK, WRITE.
1805 *
1806 * In the case of the first three, we want to put the GETATTR
1807 * after the read-type operation -- this is because it is hard
1808 * to predict the length of a GETATTR response in v4, and thus
1809 * align the READ data correctly. This means that the GETATTR
1810 * may end up partially falling into the page cache, and we should
1811 * shift it into the 'tail' of the xdr_buf before processing.
1812 * To do this efficiently, we need to know the total length
1813 * of data received, which doesn't seem to be available outside
1814 * of the RPC layer.
1815 *
1816 * In the case of WRITE, we also want to put the GETATTR after
1817 * the operation -- in this case because we want to make sure
1818 * we get the post-operation mtime and size. This means that
1819 * we can't use xdr_encode_pages() as written: we need a variant
1820 * of it which would leave room in the 'tail' iovec.
1821 *
1822 * Both of these changes to the XDR layer would in fact be quite
1823 * minor, but I decided to leave them for a subsequent patch.
1824 */
1825static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1826 unsigned int pgbase, unsigned int pglen)
1827{
1828 struct nfs4_readlink args = {
1829 .fh = NFS_FH(inode),
1830 .pgbase = pgbase,
1831 .pglen = pglen,
1832 .pages = &page,
1833 };
1834 struct rpc_message msg = {
1835 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1836 .rpc_argp = &args,
1837 .rpc_resp = NULL,
1838 };
1839
1840 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1841}
1842
1843static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1844 unsigned int pgbase, unsigned int pglen)
1845{
1846 struct nfs4_exception exception = { };
1847 int err;
1848 do {
1849 err = nfs4_handle_exception(NFS_SERVER(inode),
1850 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1851 &exception);
1852 } while (exception.retry);
1853 return err;
1854}
1855
1da177e4
LT		 1856/*
1857 * Got race?
1858 * We will need to arrange for the VFS layer to provide an atomic open.
1859 * Until then, this create/open method is prone to inefficiency and race
1860 * conditions due to the lookup, create, and open VFS calls from sys_open()
1861 * placed on the wire.
1862 *
1863 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1864 * The file will be opened again in the subsequent VFS open call
1865 * (nfs4_proc_file_open).
1866 *
1867 * The open for read will just hang around to be used by any process that
1868 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1869 */
1870
1871static int
1872nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1873 int flags, struct nameidata *nd)
1da177e4 1874{
ad389da7
TM		 1875 struct path path = {
1876 .mnt = nd->mnt,
1877 .dentry = dentry,
1878 };
1da177e4
LT		 1879 struct nfs4_state *state;
1880 struct rpc_cred *cred;
1881 int status = 0;
1882
1f163415 1883 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1884 if (IS_ERR(cred)) {
1885 status = PTR_ERR(cred);
1886 goto out;
1887 }
ad389da7 1888 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1da177e4 1889 put_rpccred(cred);
d4d9cdcb 1890 d_drop(dentry);
1da177e4
LT		 1891 if (IS_ERR(state)) {
1892 status = PTR_ERR(state);
1893 goto out;
1894 }
d4d9cdcb 1895 d_add(dentry, igrab(state->inode));
d75340cc 1896 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 1897 if (flags & O_EXCL) {
1898 struct nfs_fattr fattr;
3e4f6290 1899 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1900 if (status == 0)
65e4308d 1901 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1902 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1903 }
ad389da7 1904 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1905 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1906 else
4a35bd41 1907 nfs4_close_state(&path, state, flags);
1da177e4
LT		 1908out:
1909 return status;
1910}
1911
1912static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1913{
16e42959 1914 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 1915 struct nfs_removeargs args = {
1da177e4 1916 .fh = NFS_FH(dir),
4fdc17b2
TM		 1917 .name.len = name->len,
1918 .name.name = name->name,
16e42959
TM		 1919 .bitmask = server->attr_bitmask,
1920 };
4fdc17b2 1921 struct nfs_removeres res = {
16e42959 1922 .server = server,
1da177e4 1923 };
1da177e4 1924 struct rpc_message msg = {
4fdc17b2
TM		 1925 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1926 .rpc_argp = &args,
1927 .rpc_resp = &res,
1da177e4
LT		 1928 };
1929 int status;
1930
4fdc17b2 1931 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 1932 status = rpc_call_sync(server->client, &msg, 0);
1933 if (status == 0) {
1934 update_changeattr(dir, &res.cinfo);
4fdc17b2 1935 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 1936 }
1da177e4
LT		 1937 return status;
1938}
1939
1940static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1941{
1942 struct nfs4_exception exception = { };
1943 int err;
1944 do {
1945 err = nfs4_handle_exception(NFS_SERVER(dir),
1946 _nfs4_proc_remove(dir, name),
1947 &exception);
1948 } while (exception.retry);
1949 return err;
1950}
1951
e4eff1a6 1952static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 1953{
e4eff1a6
TM		 1954 struct nfs_server *server = NFS_SERVER(dir);
1955 struct nfs_removeargs *args = msg->rpc_argp;
1956 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 1957
e4eff1a6
TM		 1958 args->bitmask = server->attr_bitmask;
1959 res->server = server;
1da177e4 1960 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 1961}
1962
e4eff1a6 1963static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 1964{
e4eff1a6
TM		 1965 struct nfs_removeres *res = task->tk_msg.rpc_resp;
1966
1967 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1968 return 0;
1969 update_changeattr(dir, &res->cinfo);
1970 nfs_post_op_update_inode(dir, &res->dir_attr);
1971 return 1;
1da177e4
LT		 1972}
1973
1974static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1975 struct inode *new_dir, struct qstr *new_name)
1976{
6caf2c82 1977 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1978 struct nfs4_rename_arg arg = {
1979 .old_dir = NFS_FH(old_dir),
1980 .new_dir = NFS_FH(new_dir),
1981 .old_name = old_name,
1982 .new_name = new_name,
6caf2c82
TM		 1983 .bitmask = server->attr_bitmask,
1984 };
1985 struct nfs_fattr old_fattr, new_fattr;
1986 struct nfs4_rename_res res = {
1987 .server = server,
1988 .old_fattr = &old_fattr,
1989 .new_fattr = &new_fattr,
1da177e4 1990 };
1da177e4
LT		 1991 struct rpc_message msg = {
1992 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1993 .rpc_argp = &arg,
1994 .rpc_resp = &res,
1995 };
1996 int status;
1997
6caf2c82
TM		 1998 nfs_fattr_init(res.old_fattr);
1999 nfs_fattr_init(res.new_fattr);
2000 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2001
2002 if (!status) {
2003 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2004 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2005 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2006 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2007 }
2008 return status;
2009}
2010
2011static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2012 struct inode *new_dir, struct qstr *new_name)
2013{
2014 struct nfs4_exception exception = { };
2015 int err;
2016 do {
2017 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2018 _nfs4_proc_rename(old_dir, old_name,
2019 new_dir, new_name),
2020 &exception);
2021 } while (exception.retry);
2022 return err;
2023}
2024
2025static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2026{
91ba2eee 2027 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2028 struct nfs4_link_arg arg = {
2029 .fh = NFS_FH(inode),
2030 .dir_fh = NFS_FH(dir),
2031 .name = name,
91ba2eee
TM		 2032 .bitmask = server->attr_bitmask,
2033 };
2034 struct nfs_fattr fattr, dir_attr;
2035 struct nfs4_link_res res = {
2036 .server = server,
2037 .fattr = &fattr,
2038 .dir_attr = &dir_attr,
1da177e4 2039 };
1da177e4
LT		 2040 struct rpc_message msg = {
2041 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2042 .rpc_argp = &arg,
91ba2eee 2043 .rpc_resp = &res,
1da177e4
LT		 2044 };
2045 int status;
2046
91ba2eee
TM		 2047 nfs_fattr_init(res.fattr);
2048 nfs_fattr_init(res.dir_attr);
2049 status = rpc_call_sync(server->client, &msg, 0);
2050 if (!status) {
2051 update_changeattr(dir, &res.cinfo);
2052 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2053 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2054 }
1da177e4
LT		 2055
2056 return status;
2057}
2058
2059static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2060{
2061 struct nfs4_exception exception = { };
2062 int err;
2063 do {
2064 err = nfs4_handle_exception(NFS_SERVER(inode),
2065 _nfs4_proc_link(inode, dir, name),
2066 &exception);
2067 } while (exception.retry);
2068 return err;
2069}
2070
4f390c15 2071static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2072 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2073{
2074 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 2075 struct nfs_fh fhandle;
2076 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2077 struct nfs4_create_arg arg = {
2078 .dir_fh = NFS_FH(dir),
2079 .server = server,
4f390c15 2080 .name = &dentry->d_name,
1da177e4
LT		 2081 .attrs = sattr,
2082 .ftype = NF4LNK,
2083 .bitmask = server->attr_bitmask,
2084 };
2085 struct nfs4_create_res res = {
2086 .server = server,
4f390c15
CL		 2087 .fh = &fhandle,
2088 .fattr = &fattr,
56ae19f3 2089 .dir_fattr = &dir_fattr,
1da177e4
LT		 2090 };
2091 struct rpc_message msg = {
2092 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2093 .rpc_argp = &arg,
2094 .rpc_resp = &res,
2095 };
2096 int status;
2097
94a6d753 2098 if (len > NFS4_MAXPATHLEN)
1da177e4 2099 return -ENAMETOOLONG;
4f390c15 2100
94a6d753
CL		 2101 arg.u.symlink.pages = &page;
2102 arg.u.symlink.len = len;
4f390c15 2103 nfs_fattr_init(&fattr);
56ae19f3 2104 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2105
2106 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2107 if (!status) {
1da177e4 2108 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2109 nfs_post_op_update_inode(dir, res.dir_fattr);
2110 status = nfs_instantiate(dentry, &fhandle, &fattr);
2111 }
1da177e4
LT		 2112 return status;
2113}
2114
4f390c15 2115static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2116 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2117{
2118 struct nfs4_exception exception = { };
2119 int err;
2120 do {
2121 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2122 _nfs4_proc_symlink(dir, dentry, page,
2123 len, sattr),
1da177e4
LT		 2124 &exception);
2125 } while (exception.retry);
2126 return err;
2127}
2128
2129static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2130 struct iattr *sattr)
2131{
2132 struct nfs_server *server = NFS_SERVER(dir);
2133 struct nfs_fh fhandle;
56ae19f3 2134 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2135 struct nfs4_create_arg arg = {
2136 .dir_fh = NFS_FH(dir),
2137 .server = server,
2138 .name = &dentry->d_name,
2139 .attrs = sattr,
2140 .ftype = NF4DIR,
2141 .bitmask = server->attr_bitmask,
2142 };
2143 struct nfs4_create_res res = {
2144 .server = server,
2145 .fh = &fhandle,
2146 .fattr = &fattr,
56ae19f3 2147 .dir_fattr = &dir_fattr,
1da177e4
LT		 2148 };
2149 struct rpc_message msg = {
2150 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2151 .rpc_argp = &arg,
2152 .rpc_resp = &res,
2153 };
2154 int status;
2155
0e574af1 2156 nfs_fattr_init(&fattr);
56ae19f3 2157 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2158
2159 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2160 if (!status) {
2161 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2162 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2163 status = nfs_instantiate(dentry, &fhandle, &fattr);
2164 }
2165 return status;
2166}
2167
2168static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2169 struct iattr *sattr)
2170{
2171 struct nfs4_exception exception = { };
2172 int err;
2173 do {
2174 err = nfs4_handle_exception(NFS_SERVER(dir),
2175 _nfs4_proc_mkdir(dir, dentry, sattr),
2176 &exception);
2177 } while (exception.retry);
2178 return err;
2179}
2180
2181static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2182 u64 cookie, struct page *page, unsigned int count, int plus)
2183{
2184 struct inode *dir = dentry->d_inode;
2185 struct nfs4_readdir_arg args = {
2186 .fh = NFS_FH(dir),
2187 .pages = &page,
2188 .pgbase = 0,
2189 .count = count,
2190 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2191 };
2192 struct nfs4_readdir_res res;
2193 struct rpc_message msg = {
2194 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2195 .rpc_argp = &args,
2196 .rpc_resp = &res,
2197 .rpc_cred = cred,
2198 };
2199 int status;
2200
eadf4598
TM		 2201 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2202 dentry->d_parent->d_name.name,
2203 dentry->d_name.name,
2204 (unsigned long long)cookie);
1da177e4
LT		 2205 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2206 res.pgbase = args.pgbase;
2207 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2208 if (status == 0)
2209 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2210
2211 nfs_invalidate_atime(dir);
2212
eadf4598 2213 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2214 return status;
2215}
2216
2217static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2218 u64 cookie, struct page *page, unsigned int count, int plus)
2219{
2220 struct nfs4_exception exception = { };
2221 int err;
2222 do {
2223 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2224 _nfs4_proc_readdir(dentry, cred, cookie,
2225 page, count, plus),
2226 &exception);
2227 } while (exception.retry);
2228 return err;
2229}
2230
2231static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2232 struct iattr *sattr, dev_t rdev)
2233{
2234 struct nfs_server *server = NFS_SERVER(dir);
2235 struct nfs_fh fh;
56ae19f3 2236 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2237 struct nfs4_create_arg arg = {
2238 .dir_fh = NFS_FH(dir),
2239 .server = server,
2240 .name = &dentry->d_name,
2241 .attrs = sattr,
2242 .bitmask = server->attr_bitmask,
2243 };
2244 struct nfs4_create_res res = {
2245 .server = server,
2246 .fh = &fh,
2247 .fattr = &fattr,
56ae19f3 2248 .dir_fattr = &dir_fattr,
1da177e4
LT		 2249 };
2250 struct rpc_message msg = {
2251 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2252 .rpc_argp = &arg,
2253 .rpc_resp = &res,
2254 };
2255 int status;
2256 int mode = sattr->ia_mode;
2257
0e574af1 2258 nfs_fattr_init(&fattr);
56ae19f3 2259 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2260
2261 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2262 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2263 if (S_ISFIFO(mode))
2264 arg.ftype = NF4FIFO;
2265 else if (S_ISBLK(mode)) {
2266 arg.ftype = NF4BLK;
2267 arg.u.device.specdata1 = MAJOR(rdev);
2268 arg.u.device.specdata2 = MINOR(rdev);
2269 }
2270 else if (S_ISCHR(mode)) {
2271 arg.ftype = NF4CHR;
2272 arg.u.device.specdata1 = MAJOR(rdev);
2273 arg.u.device.specdata2 = MINOR(rdev);
2274 }
2275 else
2276 arg.ftype = NF4SOCK;
2277
2278 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2279 if (status == 0) {
2280 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2281 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2282 status = nfs_instantiate(dentry, &fh, &fattr);
2283 }
2284 return status;
2285}
2286
2287static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2288 struct iattr *sattr, dev_t rdev)
2289{
2290 struct nfs4_exception exception = { };
2291 int err;
2292 do {
2293 err = nfs4_handle_exception(NFS_SERVER(dir),
2294 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2295 &exception);
2296 } while (exception.retry);
2297 return err;
2298}
2299
2300static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2301 struct nfs_fsstat *fsstat)
2302{
2303 struct nfs4_statfs_arg args = {
2304 .fh = fhandle,
2305 .bitmask = server->attr_bitmask,
2306 };
2307 struct rpc_message msg = {
2308 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2309 .rpc_argp = &args,
2310 .rpc_resp = fsstat,
2311 };
2312
0e574af1 2313 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2314 return rpc_call_sync(server->client, &msg, 0);
2315}
2316
2317static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2318{
2319 struct nfs4_exception exception = { };
2320 int err;
2321 do {
2322 err = nfs4_handle_exception(server,
2323 _nfs4_proc_statfs(server, fhandle, fsstat),
2324 &exception);
2325 } while (exception.retry);
2326 return err;
2327}
2328
2329static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2330 struct nfs_fsinfo *fsinfo)
2331{
2332 struct nfs4_fsinfo_arg args = {
2333 .fh = fhandle,
2334 .bitmask = server->attr_bitmask,
2335 };
2336 struct rpc_message msg = {
2337 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2338 .rpc_argp = &args,
2339 .rpc_resp = fsinfo,
2340 };
2341
2342 return rpc_call_sync(server->client, &msg, 0);
2343}
2344
2345static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2346{
2347 struct nfs4_exception exception = { };
2348 int err;
2349
2350 do {
2351 err = nfs4_handle_exception(server,
2352 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2353 &exception);
2354 } while (exception.retry);
2355 return err;
2356}
2357
2358static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2359{
0e574af1 2360 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2361 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2362}
2363
2364static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2365 struct nfs_pathconf *pathconf)
2366{
2367 struct nfs4_pathconf_arg args = {
2368 .fh = fhandle,
2369 .bitmask = server->attr_bitmask,
2370 };
2371 struct rpc_message msg = {
2372 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2373 .rpc_argp = &args,
2374 .rpc_resp = pathconf,
2375 };
2376
2377 /* None of the pathconf attributes are mandatory to implement */
2378 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2379 memset(pathconf, 0, sizeof(*pathconf));
2380 return 0;
2381 }
2382
0e574af1 2383 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2384 return rpc_call_sync(server->client, &msg, 0);
2385}
2386
2387static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2388 struct nfs_pathconf *pathconf)
2389{
2390 struct nfs4_exception exception = { };
2391 int err;
2392
2393 do {
2394 err = nfs4_handle_exception(server,
2395 _nfs4_proc_pathconf(server, fhandle, pathconf),
2396 &exception);
2397 } while (exception.retry);
2398 return err;
2399}
2400
ec06c096 2401static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2402{
ec06c096 2403 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2404
ec06c096 2405 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2406 rpc_restart_call(task);
ec06c096 2407 return -EAGAIN;
1da177e4 2408 }
8850df99
TM		 2409
2410 nfs_invalidate_atime(data->inode);
1da177e4 2411 if (task->tk_status > 0)
ec06c096
TM		 2412 renew_lease(server, data->timestamp);
2413 return 0;
1da177e4
LT		 2414}
2415
ec06c096 2416static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2417{
1da177e4
LT		 2418 struct rpc_message msg = {
2419 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2420 .rpc_argp = &data->args,
2421 .rpc_resp = &data->res,
2422 .rpc_cred = data->cred,
2423 };
1da177e4
LT		 2424
2425 data->timestamp = jiffies;
2426
ec06c096 2427 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2428}
2429
788e7a89 2430static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2431{
1da177e4
LT		 2432 struct inode *inode = data->inode;
2433
2434 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2435 rpc_restart_call(task);
788e7a89 2436 return -EAGAIN;
1da177e4 2437 }
4f9838c7 2438 if (task->tk_status >= 0) {
1da177e4 2439 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2440 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2441 }
788e7a89 2442 return 0;
1da177e4
LT		 2443}
2444
788e7a89 2445static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2446{
1da177e4
LT		 2447 struct rpc_message msg = {
2448 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2449 .rpc_argp = &data->args,
2450 .rpc_resp = &data->res,
2451 .rpc_cred = data->cred,
2452 };
2453 struct inode *inode = data->inode;
4f9838c7 2454 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2455 int stable;
1da177e4
LT		 2456
2457 if (how & FLUSH_STABLE) {
2458 if (!NFS_I(inode)->ncommit)
2459 stable = NFS_FILE_SYNC;
2460 else
2461 stable = NFS_DATA_SYNC;
2462 } else
2463 stable = NFS_UNSTABLE;
2464 data->args.stable = stable;
4f9838c7
TM		 2465 data->args.bitmask = server->attr_bitmask;
2466 data->res.server = server;
1da177e4
LT		 2467
2468 data->timestamp = jiffies;
2469
1da177e4 2470 /* Finalize the task. */
788e7a89 2471 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2472}
2473
788e7a89 2474static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2475{
1da177e4
LT		 2476 struct inode *inode = data->inode;
2477
2478 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2479 rpc_restart_call(task);
788e7a89 2480 return -EAGAIN;
1da177e4 2481 }
9e08a3c5 2482 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2483 return 0;
1da177e4
LT		 2484}
2485
788e7a89 2486static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2487{
1da177e4
LT		 2488 struct rpc_message msg = {
2489 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2490 .rpc_argp = &data->args,
2491 .rpc_resp = &data->res,
2492 .rpc_cred = data->cred,
2493 };
788e7a89 2494 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2495
4f9838c7
TM		 2496 data->args.bitmask = server->attr_bitmask;
2497 data->res.server = server;
2498
788e7a89 2499 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2500}
2501
2502/*
2503 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2504 * standalone procedure for queueing an asynchronous RENEW.
2505 */
963d8fe5 2506static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2507{
adfa6f98 2508 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2509 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2510
2511 if (task->tk_status < 0) {
2512 switch (task->tk_status) {
2513 case -NFS4ERR_STALE_CLIENTID:
2514 case -NFS4ERR_EXPIRED:
2515 case -NFS4ERR_CB_PATH_DOWN:
2516 nfs4_schedule_state_recovery(clp);
2517 }
2518 return;
2519 }
2520 spin_lock(&clp->cl_lock);
2521 if (time_before(clp->cl_last_renewal,timestamp))
2522 clp->cl_last_renewal = timestamp;
2523 spin_unlock(&clp->cl_lock);
2524}
2525
963d8fe5
TM		 2526static const struct rpc_call_ops nfs4_renew_ops = {
2527 .rpc_call_done = nfs4_renew_done,
2528};
2529
adfa6f98 2530int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2531{
2532 struct rpc_message msg = {
2533 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2534 .rpc_argp = clp,
b4454fe1 2535 .rpc_cred = cred,
1da177e4
LT		 2536 };
2537
2538 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2539 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2540}
2541
adfa6f98 2542int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2543{
2544 struct rpc_message msg = {
2545 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2546 .rpc_argp = clp,
b4454fe1 2547 .rpc_cred = cred,
1da177e4
LT		 2548 };
2549 unsigned long now = jiffies;
2550 int status;
2551
2552 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2553 if (status < 0)
2554 return status;
2555 spin_lock(&clp->cl_lock);
2556 if (time_before(clp->cl_last_renewal,now))
2557 clp->cl_last_renewal = now;
2558 spin_unlock(&clp->cl_lock);
2559 return 0;
2560}
2561
aa1870af
BF		 2562static inline int nfs4_server_supports_acls(struct nfs_server *server)
2563{
2564 return (server->caps & NFS_CAP_ACLS)
2565 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2566 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2567}
2568
2569/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2570 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2571 * the stack.
2572 */
2573#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2574
2575static void buf_to_pages(const void *buf, size_t buflen,
2576 struct page **pages, unsigned int *pgbase)
2577{
2578 const void *p = buf;
2579
2580 *pgbase = offset_in_page(buf);
2581 p -= *pgbase;
2582 while (p < buf + buflen) {
2583 *(pages++) = virt_to_page(p);
2584 p += PAGE_CACHE_SIZE;
2585 }
2586}
2587
e50a1c2e
BF		 2588struct nfs4_cached_acl {
2589 int cached;
2590 size_t len;
3e9d4154 2591 char data[0];
e50a1c2e
BF		 2592};
2593
2594static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2595{
2596 struct nfs_inode *nfsi = NFS_I(inode);
2597
2598 spin_lock(&inode->i_lock);
2599 kfree(nfsi->nfs4_acl);
2600 nfsi->nfs4_acl = acl;
2601 spin_unlock(&inode->i_lock);
2602}
2603
2604static void nfs4_zap_acl_attr(struct inode *inode)
2605{
2606 nfs4_set_cached_acl(inode, NULL);
2607}
2608
2609static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2610{
2611 struct nfs_inode *nfsi = NFS_I(inode);
2612 struct nfs4_cached_acl *acl;
2613 int ret = -ENOENT;
2614
2615 spin_lock(&inode->i_lock);
2616 acl = nfsi->nfs4_acl;
2617 if (acl == NULL)
2618 goto out;
2619 if (buf == NULL) /* user is just asking for length */
2620 goto out_len;
2621 if (acl->cached == 0)
2622 goto out;
2623 ret = -ERANGE; /* see getxattr(2) man page */
2624 if (acl->len > buflen)
2625 goto out;
2626 memcpy(buf, acl->data, acl->len);
2627out_len:
2628 ret = acl->len;
2629out:
2630 spin_unlock(&inode->i_lock);
2631 return ret;
2632}
2633
2634static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2635{
2636 struct nfs4_cached_acl *acl;
2637
2638 if (buf && acl_len <= PAGE_SIZE) {
2639 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2640 if (acl == NULL)
2641 goto out;
2642 acl->cached = 1;
2643 memcpy(acl->data, buf, acl_len);
2644 } else {
2645 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2646 if (acl == NULL)
2647 goto out;
2648 acl->cached = 0;
2649 }
2650 acl->len = acl_len;
2651out:
2652 nfs4_set_cached_acl(inode, acl);
2653}
2654
16b4289c 2655static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2656{
aa1870af
BF		 2657 struct page *pages[NFS4ACL_MAXPAGES];
2658 struct nfs_getaclargs args = {
2659 .fh = NFS_FH(inode),
2660 .acl_pages = pages,
2661 .acl_len = buflen,
2662 };
2663 size_t resp_len = buflen;
e50a1c2e 2664 void *resp_buf;
aa1870af
BF		 2665 struct rpc_message msg = {
2666 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2667 .rpc_argp = &args,
2668 .rpc_resp = &resp_len,
2669 };
e50a1c2e 2670 struct page *localpage = NULL;
aa1870af
BF		 2671 int ret;
2672
e50a1c2e
BF		 2673 if (buflen < PAGE_SIZE) {
2674 /* As long as we're doing a round trip to the server anyway,
2675 * let's be prepared for a page of acl data. */
2676 localpage = alloc_page(GFP_KERNEL);
2677 resp_buf = page_address(localpage);
2678 if (localpage == NULL)
2679 return -ENOMEM;
2680 args.acl_pages[0] = localpage;
2681 args.acl_pgbase = 0;
1d95db8e 2682 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2683 } else {
2684 resp_buf = buf;
2685 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2686 }
aa1870af 2687 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2688 if (ret)
2689 goto out_free;
2690 if (resp_len > args.acl_len)
2691 nfs4_write_cached_acl(inode, NULL, resp_len);
2692 else
2693 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2694 if (buf) {
2695 ret = -ERANGE;
2696 if (resp_len > buflen)
2697 goto out_free;
2698 if (localpage)
2699 memcpy(buf, resp_buf, resp_len);
2700 }
2701 ret = resp_len;
2702out_free:
2703 if (localpage)
2704 __free_page(localpage);
aa1870af
BF		 2705 return ret;
2706}
2707
16b4289c
TM		 2708static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2709{
2710 struct nfs4_exception exception = { };
2711 ssize_t ret;
2712 do {
2713 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2714 if (ret >= 0)
2715 break;
2716 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2717 } while (exception.retry);
2718 return ret;
2719}
2720
e50a1c2e
BF		 2721static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2722{
2723 struct nfs_server *server = NFS_SERVER(inode);
2724 int ret;
2725
2726 if (!nfs4_server_supports_acls(server))
2727 return -EOPNOTSUPP;
2728 ret = nfs_revalidate_inode(server, inode);
2729 if (ret < 0)
2730 return ret;
2731 ret = nfs4_read_cached_acl(inode, buf, buflen);
2732 if (ret != -ENOENT)
2733 return ret;
2734 return nfs4_get_acl_uncached(inode, buf, buflen);
2735}
2736
16b4289c 2737static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2738{
2739 struct nfs_server *server = NFS_SERVER(inode);
2740 struct page *pages[NFS4ACL_MAXPAGES];
2741 struct nfs_setaclargs arg = {
2742 .fh = NFS_FH(inode),
2743 .acl_pages = pages,
2744 .acl_len = buflen,
2745 };
2746 struct rpc_message msg = {
2747 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2748 .rpc_argp = &arg,
2749 .rpc_resp = NULL,
2750 };
2751 int ret;
2752
2753 if (!nfs4_server_supports_acls(server))
2754 return -EOPNOTSUPP;
642ac549 2755 nfs_inode_return_delegation(inode);
4b580ee3 2756 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2757 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
08efa202 2758 nfs_zap_caches(inode);
4b580ee3
BF		 2759 return ret;
2760}
2761
16b4289c
TM		 2762static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2763{
2764 struct nfs4_exception exception = { };
2765 int err;
2766 do {
2767 err = nfs4_handle_exception(NFS_SERVER(inode),
2768 __nfs4_proc_set_acl(inode, buf, buflen),
2769 &exception);
2770 } while (exception.retry);
2771 return err;
2772}
2773
1da177e4 2774static int
faf5f49c 2775nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2776{
7539bbab 2777 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2778
2779 if (!clp || task->tk_status >= 0)
2780 return 0;
2781 switch(task->tk_status) {
2782 case -NFS4ERR_STALE_CLIENTID:
2783 case -NFS4ERR_STALE_STATEID:
2784 case -NFS4ERR_EXPIRED:
2785 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2786 nfs4_schedule_state_recovery(clp);
433fbe4c 2787 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2788 rpc_wake_up_task(task);
2789 task->tk_status = 0;
2790 return -EAGAIN;
1da177e4 2791 case -NFS4ERR_DELAY:
006ea73e
CL		 2792 nfs_inc_server_stats((struct nfs_server *) server,
2793 NFSIOS_DELAY);
2794 case -NFS4ERR_GRACE:
1da177e4
LT		 2795 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2796 task->tk_status = 0;
2797 return -EAGAIN;
2798 case -NFS4ERR_OLD_STATEID:
2799 task->tk_status = 0;
2800 return -EAGAIN;
2801 }
2802 task->tk_status = nfs4_map_errors(task->tk_status);
2803 return 0;
2804}
2805
433fbe4c
TM		 2806static int nfs4_wait_bit_interruptible(void *word)
2807{
2808 if (signal_pending(current))
2809 return -ERESTARTSYS;
2810 schedule();
2811 return 0;
2812}
2813
adfa6f98 2814static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2815{
1da177e4 2816 sigset_t oldset;
433fbe4c 2817 int res;
1da177e4
LT		 2818
2819 might_sleep();
2820
e148582e
TM		 2821 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2822
1da177e4 2823 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2824 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2825 nfs4_wait_bit_interruptible,
2826 TASK_INTERRUPTIBLE);
1da177e4 2827 rpc_clnt_sigunmask(clnt, &oldset);
e148582e
TM		 2828
2829 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2830 return res;
2831}
2832
2833static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2834{
2835 sigset_t oldset;
2836 int res = 0;
2837
2838 might_sleep();
2839
2840 if (*timeout <= 0)
2841 *timeout = NFS4_POLL_RETRY_MIN;
2842 if (*timeout > NFS4_POLL_RETRY_MAX)
2843 *timeout = NFS4_POLL_RETRY_MAX;
2844 rpc_clnt_sigmask(clnt, &oldset);
2845 if (clnt->cl_intr) {
041e0e3b 2846 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2847 if (signalled())
2848 res = -ERESTARTSYS;
041e0e3b
NA		 2849 } else
2850 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2851 rpc_clnt_sigunmask(clnt, &oldset);
2852 *timeout <<= 1;
2853 return res;
2854}
2855
2856/* This is the error handling routine for processes that are allowed
2857 * to sleep.
2858 */
10afec90 2859static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2860{
7539bbab 2861 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2862 int ret = errorcode;
2863
2864 exception->retry = 0;
2865 switch(errorcode) {
2866 case 0:
2867 return 0;
2868 case -NFS4ERR_STALE_CLIENTID:
2869 case -NFS4ERR_STALE_STATEID:
2870 case -NFS4ERR_EXPIRED:
433fbe4c 2871 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2872 ret = nfs4_wait_clnt_recover(server->client, clp);
2873 if (ret == 0)
2874 exception->retry = 1;
2875 break;
c514983d 2876 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2877 case -NFS4ERR_GRACE:
2878 case -NFS4ERR_DELAY:
2879 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2880 if (ret != 0)
2881 break;
1da177e4 2882 case -NFS4ERR_OLD_STATEID:
2c56617d 2883 exception->retry = 1;
1da177e4
LT		 2884 }
2885 /* We failed to handle the error */
2886 return nfs4_map_errors(ret);
2887}
2888
adfa6f98 2889int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2890{
2891 nfs4_verifier sc_verifier;
2892 struct nfs4_setclientid setclientid = {
2893 .sc_verifier = &sc_verifier,
2894 .sc_prog = program,
2895 };
2896 struct rpc_message msg = {
2897 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2898 .rpc_argp = &setclientid,
2899 .rpc_resp = clp,
286d7d6a 2900 .rpc_cred = cred,
1da177e4 2901 };
bc4785cd 2902 __be32 *p;
1da177e4
LT		 2903 int loop = 0;
2904 int status;
2905
bc4785cd 2906 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2907 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2908 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2909
2910 for(;;) {
2911 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2912 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2913 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2914 cred->cr_ops->cr_name,
1da177e4
LT		 2915 clp->cl_id_uniquifier);
2916 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2917 sizeof(setclientid.sc_netid), "tcp");
2918 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2919 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2920 clp->cl_ipaddr, port >> 8, port & 255);
2921
2922 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2923 if (status != -NFS4ERR_CLID_INUSE)
2924 break;
2925 if (signalled())
2926 break;
2927 if (loop++ & 1)
2928 ssleep(clp->cl_lease_time + 1);
2929 else
2930 if (++clp->cl_id_uniquifier == 0)
2931 break;
2932 }
2933 return status;
2934}
2935
adfa6f98 2936static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2937{
2938 struct nfs_fsinfo fsinfo;
2939 struct rpc_message msg = {
2940 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2941 .rpc_argp = clp,
2942 .rpc_resp = &fsinfo,
286d7d6a 2943 .rpc_cred = cred,
1da177e4
LT		 2944 };
2945 unsigned long now;
2946 int status;
2947
2948 now = jiffies;
2949 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2950 if (status == 0) {
2951 spin_lock(&clp->cl_lock);
2952 clp->cl_lease_time = fsinfo.lease_time * HZ;
2953 clp->cl_last_renewal = now;
58d9714a 2954 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2955 spin_unlock(&clp->cl_lock);
2956 }
2957 return status;
2958}
2959
adfa6f98 2960int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2961{
2962 long timeout;
2963 int err;
2964 do {
2965 err = _nfs4_proc_setclientid_confirm(clp, cred);
2966 switch (err) {
2967 case 0:
2968 return err;
2969 case -NFS4ERR_RESOURCE:
2970 /* The IBM lawyers misread another document! */
2971 case -NFS4ERR_DELAY:
2972 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2973 }
2974 } while (err == 0);
2975 return err;
2976}
2977
fe650407
TM		 2978struct nfs4_delegreturndata {
2979 struct nfs4_delegreturnargs args;
fa178f29 2980 struct nfs4_delegreturnres res;
fe650407
TM		 2981 struct nfs_fh fh;
2982 nfs4_stateid stateid;
2983 struct rpc_cred *cred;
26e976a8 2984 unsigned long timestamp;
fa178f29 2985 struct nfs_fattr fattr;
fe650407
TM		 2986 int rpc_status;
2987};
2988
2989static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 2990{
fe650407 2991 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 2992 struct rpc_message msg = {
2993 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 2994 .rpc_argp = &data->args,
fa178f29 2995 .rpc_resp = &data->res,
fe650407 2996 .rpc_cred = data->cred,
1da177e4 2997 };
fa178f29 2998 nfs_fattr_init(data->res.fattr);
fe650407
TM		 2999 rpc_call_setup(task, &msg, 0);
3000}
1da177e4 3001
fe650407
TM		 3002static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3003{
3004 struct nfs4_delegreturndata *data = calldata;
3005 data->rpc_status = task->tk_status;
26e976a8 3006 if (data->rpc_status == 0)
fa178f29 3007 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 3008}
3009
3010static void nfs4_delegreturn_release(void *calldata)
3011{
3012 struct nfs4_delegreturndata *data = calldata;
3013
3014 put_rpccred(data->cred);
3015 kfree(calldata);
3016}
3017
c8d149f3 3018static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 3019 .rpc_call_prepare = nfs4_delegreturn_prepare,
3020 .rpc_call_done = nfs4_delegreturn_done,
3021 .rpc_release = nfs4_delegreturn_release,
3022};
3023
3024static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3025{
3026 struct nfs4_delegreturndata *data;
fa178f29 3027 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 3028 struct rpc_task *task;
3029 int status;
3030
3031 data = kmalloc(sizeof(*data), GFP_KERNEL);
3032 if (data == NULL)
3033 return -ENOMEM;
3034 data->args.fhandle = &data->fh;
3035 data->args.stateid = &data->stateid;
fa178f29 3036 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3037 nfs_copy_fh(&data->fh, NFS_FH(inode));
3038 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3039 data->res.fattr = &data->fattr;
3040 data->res.server = server;
fe650407 3041 data->cred = get_rpccred(cred);
26e976a8 3042 data->timestamp = jiffies;
fe650407
TM		 3043 data->rpc_status = 0;
3044
3045 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 3046 if (IS_ERR(task))
fe650407 3047 return PTR_ERR(task);
fe650407 3048 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 3049 if (status == 0) {
fe650407 3050 status = data->rpc_status;
fa178f29 3051 if (status == 0)
9e08a3c5 3052 nfs_refresh_inode(inode, &data->fattr);
fa178f29 3053 }
e6b3c4db 3054 rpc_put_task(task);
fe650407 3055 return status;
1da177e4
LT		 3056}
3057
3058int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3059{
3060 struct nfs_server *server = NFS_SERVER(inode);
3061 struct nfs4_exception exception = { };
3062 int err;
3063 do {
3064 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3065 switch (err) {
3066 case -NFS4ERR_STALE_STATEID:
3067 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3068 case 0:
3069 return 0;
3070 }
3071 err = nfs4_handle_exception(server, err, &exception);
3072 } while (exception.retry);
3073 return err;
3074}
3075
3076#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3077#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3078
3079/*
3080 * sleep, with exponential backoff, and retry the LOCK operation.
3081 */
3082static unsigned long
3083nfs4_set_lock_task_retry(unsigned long timeout)
3084{
041e0e3b 3085 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3086 timeout <<= 1;
3087 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3088 return NFS4_LOCK_MAXTIMEOUT;
3089 return timeout;
3090}
3091
1da177e4
LT		 3092static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3093{
3094 struct inode *inode = state->inode;
3095 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3096 struct nfs_client *clp = server->nfs_client;
911d1aaf 3097 struct nfs_lockt_args arg = {
1da177e4 3098 .fh = NFS_FH(inode),
911d1aaf 3099 .fl = request,
1da177e4 3100 };
911d1aaf
TM		 3101 struct nfs_lockt_res res = {
3102 .denied = request,
1da177e4
LT		 3103 };
3104 struct rpc_message msg = {
3105 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3106 .rpc_argp = &arg,
3107 .rpc_resp = &res,
3108 .rpc_cred = state->owner->so_cred,
3109 };
1da177e4
LT		 3110 struct nfs4_lock_state *lsp;
3111 int status;
3112
3113 down_read(&clp->cl_sem);
911d1aaf 3114 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3115 status = nfs4_set_lock_state(state, request);
3116 if (status != 0)
3117 goto out;
3118 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3119 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3120 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3121 switch (status) {
3122 case 0:
3123 request->fl_type = F_UNLCK;
3124 break;
3125 case -NFS4ERR_DENIED:
3126 status = 0;
1da177e4 3127 }
70cc6487 3128 request->fl_ops->fl_release_private(request);
8d0a8a9d 3129out:
1da177e4
LT		 3130 up_read(&clp->cl_sem);
3131 return status;
3132}
3133
3134static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3135{
3136 struct nfs4_exception exception = { };
3137 int err;
3138
3139 do {
3140 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3141 _nfs4_proc_getlk(state, cmd, request),
3142 &exception);
3143 } while (exception.retry);
3144 return err;
3145}
3146
3147static int do_vfs_lock(struct file *file, struct file_lock *fl)
3148{
3149 int res = 0;
3150 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3151 case FL_POSIX:
3152 res = posix_lock_file_wait(file, fl);
3153 break;
3154 case FL_FLOCK:
3155 res = flock_lock_file_wait(file, fl);
3156 break;
3157 default:
3158 BUG();
3159 }
1da177e4
LT		 3160 return res;
3161}
3162
faf5f49c 3163struct nfs4_unlockdata {
911d1aaf
TM		 3164 struct nfs_locku_args arg;
3165 struct nfs_locku_res res;
faf5f49c
TM		 3166 struct nfs4_lock_state *lsp;
3167 struct nfs_open_context *ctx;
911d1aaf
TM		 3168 struct file_lock fl;
3169 const struct nfs_server *server;
26e976a8 3170 unsigned long timestamp;
faf5f49c
TM		 3171};
3172
911d1aaf
TM		 3173static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3174 struct nfs_open_context *ctx,
3175 struct nfs4_lock_state *lsp,
3176 struct nfs_seqid *seqid)
3177{
3178 struct nfs4_unlockdata *p;
3179 struct inode *inode = lsp->ls_state->inode;
3180
3181 p = kmalloc(sizeof(*p), GFP_KERNEL);
3182 if (p == NULL)
3183 return NULL;
3184 p->arg.fh = NFS_FH(inode);
3185 p->arg.fl = &p->fl;
3186 p->arg.seqid = seqid;
3187 p->arg.stateid = &lsp->ls_stateid;
3188 p->lsp = lsp;
3189 atomic_inc(&lsp->ls_count);
3190 /* Ensure we don't close file until we're done freeing locks! */
3191 p->ctx = get_nfs_open_context(ctx);
3192 memcpy(&p->fl, fl, sizeof(p->fl));
3193 p->server = NFS_SERVER(inode);
3194 return p;
3195}
3196
06f814a3 3197static void nfs4_locku_release_calldata(void *data)
faf5f49c 3198{
963d8fe5 3199 struct nfs4_unlockdata *calldata = data;
911d1aaf 3200 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3201 nfs4_put_lock_state(calldata->lsp);
3202 put_nfs_open_context(calldata->ctx);
3203 kfree(calldata);
faf5f49c
TM		 3204}
3205
963d8fe5 3206static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3207{
963d8fe5 3208 struct nfs4_unlockdata *calldata = data;
faf5f49c 3209
06f814a3
TM		 3210 if (RPC_ASSASSINATED(task))
3211 return;
911d1aaf 3212 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3213 switch (task->tk_status) {
3214 case 0:
3215 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3216 calldata->res.stateid.data,
faf5f49c 3217 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3218 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3219 break;
3220 case -NFS4ERR_STALE_STATEID:
3221 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3222 break;
3223 default:
a6a352e9 3224 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3225 rpc_restart_call(task);
faf5f49c 3226 }
faf5f49c
TM		 3227}
3228
4ce70ada 3229static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3230{
4ce70ada 3231 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3232 struct rpc_message msg = {
3233 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3234 .rpc_argp = &calldata->arg,
3235 .rpc_resp = &calldata->res,
3236 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3237 };
faf5f49c 3238
911d1aaf 3239 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3240 return;
3241 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3242 /* Note: exit _without_ running nfs4_locku_done */
3243 task->tk_action = NULL;
faf5f49c
TM		 3244 return;
3245 }
26e976a8 3246 calldata->timestamp = jiffies;
faf5f49c
TM		 3247 rpc_call_setup(task, &msg, 0);
3248}
3249
963d8fe5 3250static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3251 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3252 .rpc_call_done = nfs4_locku_done,
06f814a3 3253 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3254};
3255
a5d16a4d
TM		 3256static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3257 struct nfs_open_context *ctx,
3258 struct nfs4_lock_state *lsp,
3259 struct nfs_seqid *seqid)
3260{
3261 struct nfs4_unlockdata *data;
a5d16a4d 3262
137d6aca
FF		 3263 /* Ensure this is an unlock - when canceling a lock, the
3264 * canceled lock is passed in, and it won't be an unlock.
3265 */
3266 fl->fl_type = F_UNLCK;
3267
a5d16a4d
TM		 3268 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3269 if (data == NULL) {
3270 nfs_free_seqid(seqid);
3271 return ERR_PTR(-ENOMEM);
3272 }
3273
7a1218a2 3274 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3275}
3276
faf5f49c
TM		 3277static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3278{
911d1aaf 3279 struct nfs_seqid *seqid;
1da177e4 3280 struct nfs4_lock_state *lsp;
06f814a3
TM		 3281 struct rpc_task *task;
3282 int status = 0;
faf5f49c 3283
8d0a8a9d 3284 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3285 /* Unlock _before_ we do the RPC call */
3286 request->fl_flags |= FL_EXISTS;
3287 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3288 goto out;
8d0a8a9d 3289 if (status != 0)
9b073574
TM		 3290 goto out;
3291 /* Is this a delegated lock? */
3292 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3293 goto out;
8d0a8a9d 3294 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3295 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3296 status = -ENOMEM;
911d1aaf 3297 if (seqid == NULL)
9b073574 3298 goto out;
cd3758e3 3299 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3300 status = PTR_ERR(task);
3301 if (IS_ERR(task))
9b073574 3302 goto out;
a5d16a4d 3303 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3304 rpc_put_task(task);
9b073574 3305out:
1da177e4
LT		 3306 return status;
3307}
3308
a5d16a4d
TM		 3309struct nfs4_lockdata {
3310 struct nfs_lock_args arg;
3311 struct nfs_lock_res res;
3312 struct nfs4_lock_state *lsp;
3313 struct nfs_open_context *ctx;
3314 struct file_lock fl;
26e976a8 3315 unsigned long timestamp;
a5d16a4d
TM		 3316 int rpc_status;
3317 int cancelled;
3318};
3319
3320static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3321 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3322{
a5d16a4d
TM		 3323 struct nfs4_lockdata *p;
3324 struct inode *inode = lsp->ls_state->inode;
1da177e4 3325 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3326
3327 p = kzalloc(sizeof(*p), GFP_KERNEL);
3328 if (p == NULL)
3329 return NULL;
3330
3331 p->arg.fh = NFS_FH(inode);
3332 p->arg.fl = &p->fl;
3333 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3334 if (p->arg.lock_seqid == NULL)
3335 goto out_free;
3336 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3337 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3338 p->arg.lock_owner.id = lsp->ls_id.id;
a5d16a4d
TM		 3339 p->lsp = lsp;
3340 atomic_inc(&lsp->ls_count);
3341 p->ctx = get_nfs_open_context(ctx);
3342 memcpy(&p->fl, fl, sizeof(p->fl));
3343 return p;
3344out_free:
3345 kfree(p);
3346 return NULL;
3347}
3348
3349static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3350{
3351 struct nfs4_lockdata *data = calldata;
3352 struct nfs4_state *state = data->lsp->ls_state;
3353 struct nfs4_state_owner *sp = state->owner;
1da177e4 3354 struct rpc_message msg = {
a5d16a4d
TM		 3355 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3356 .rpc_argp = &data->arg,
3357 .rpc_resp = &data->res,
3358 .rpc_cred = sp->so_cred,
1da177e4 3359 };
06735b34 3360
a5d16a4d
TM		 3361 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3362 return;
3363 dprintk("%s: begin!\n", __FUNCTION__);
3364 /* Do we need to do an open_to_lock_owner? */
3365 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3366 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3367 if (data->arg.open_seqid == NULL) {
3368 data->rpc_status = -ENOMEM;
3369 task->tk_action = NULL;
06735b34 3370 goto out;
8d0a8a9d 3371 }
a5d16a4d
TM		 3372 data->arg.open_stateid = &state->stateid;
3373 data->arg.new_lock_owner = 1;
3374 }
26e976a8 3375 data->timestamp = jiffies;
a5d16a4d 3376 rpc_call_setup(task, &msg, 0);
06735b34 3377out:
a5d16a4d
TM		 3378 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3379}
3380
3381static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3382{
3383 struct nfs4_lockdata *data = calldata;
3384
3385 dprintk("%s: begin!\n", __FUNCTION__);
3386
3387 data->rpc_status = task->tk_status;
3388 if (RPC_ASSASSINATED(task))
3389 goto out;
3390 if (data->arg.new_lock_owner != 0) {
3391 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3392 if (data->rpc_status == 0)
3393 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3394 else
3395 goto out;
3396 }
3397 if (data->rpc_status == 0) {
3398 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3399 sizeof(data->lsp->ls_stateid.data));
3400 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3401 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3402 }
3403 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3404out:
3405 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3406}
3407
3408static void nfs4_lock_release(void *calldata)
3409{
3410 struct nfs4_lockdata *data = calldata;
3411
3412 dprintk("%s: begin!\n", __FUNCTION__);
3413 if (data->arg.open_seqid != NULL)
3414 nfs_free_seqid(data->arg.open_seqid);
3415 if (data->cancelled != 0) {
3416 struct rpc_task *task;
3417 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3418 data->arg.lock_seqid);
3419 if (!IS_ERR(task))
e6b3c4db 3420 rpc_put_task(task);
a5d16a4d
TM		 3421 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3422 } else
3423 nfs_free_seqid(data->arg.lock_seqid);
3424 nfs4_put_lock_state(data->lsp);
3425 put_nfs_open_context(data->ctx);
3426 kfree(data);
3427 dprintk("%s: done!\n", __FUNCTION__);
3428}
3429
3430static const struct rpc_call_ops nfs4_lock_ops = {
3431 .rpc_call_prepare = nfs4_lock_prepare,
3432 .rpc_call_done = nfs4_lock_done,
3433 .rpc_release = nfs4_lock_release,
3434};
3435
3436static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3437{
3438 struct nfs4_lockdata *data;
3439 struct rpc_task *task;
3440 int ret;
3441
3442 dprintk("%s: begin!\n", __FUNCTION__);
cd3758e3 3443 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3444 fl->fl_u.nfs4_fl.owner);
3445 if (data == NULL)
3446 return -ENOMEM;
3447 if (IS_SETLKW(cmd))
3448 data->arg.block = 1;
3449 if (reclaim != 0)
3450 data->arg.reclaim = 1;
3451 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3452 &nfs4_lock_ops, data);
7a1218a2 3453 if (IS_ERR(task))
a5d16a4d 3454 return PTR_ERR(task);
a5d16a4d
TM		 3455 ret = nfs4_wait_for_completion_rpc_task(task);
3456 if (ret == 0) {
3457 ret = data->rpc_status;
3458 if (ret == -NFS4ERR_DENIED)
3459 ret = -EAGAIN;
3460 } else
3461 data->cancelled = 1;
e6b3c4db 3462 rpc_put_task(task);
a5d16a4d
TM		 3463 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3464 return ret;
1da177e4
LT		 3465}
3466
3467static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3468{
202b50dc
TM		 3469 struct nfs_server *server = NFS_SERVER(state->inode);
3470 struct nfs4_exception exception = { };
3471 int err;
3472
3473 do {
42a2d13e
TM		 3474 /* Cache the lock if possible... */
3475 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3476 return 0;
202b50dc
TM		 3477 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3478 if (err != -NFS4ERR_DELAY)
3479 break;
3480 nfs4_handle_exception(server, err, &exception);
3481 } while (exception.retry);
3482 return err;
1da177e4
LT		 3483}
3484
3485static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3486{
202b50dc
TM		 3487 struct nfs_server *server = NFS_SERVER(state->inode);
3488 struct nfs4_exception exception = { };
3489 int err;
3490
6bfc93ef
TM		 3491 err = nfs4_set_lock_state(state, request);
3492 if (err != 0)
3493 return err;
202b50dc 3494 do {
42a2d13e
TM		 3495 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3496 return 0;
202b50dc
TM		 3497 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3498 if (err != -NFS4ERR_DELAY)
3499 break;
3500 nfs4_handle_exception(server, err, &exception);
3501 } while (exception.retry);
3502 return err;
1da177e4
LT		 3503}
3504
3505static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3506{
adfa6f98 3507 struct nfs_client *clp = state->owner->so_client;
01c3b861 3508 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3509 int status;
3510
6bfc93ef 3511 /* Is this a delegated open? */
6bfc93ef
TM		 3512 status = nfs4_set_lock_state(state, request);
3513 if (status != 0)
3514 goto out;
01c3b861
TM		 3515 request->fl_flags |= FL_ACCESS;
3516 status = do_vfs_lock(request->fl_file, request);
3517 if (status < 0)
3518 goto out;
3519 down_read(&clp->cl_sem);
3520 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3521 struct nfs_inode *nfsi = NFS_I(state->inode);
3522 /* Yes: cache locks! */
3523 down_read(&nfsi->rwsem);
3524 /* ...but avoid races with delegation recall... */
3525 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3526 request->fl_flags = fl_flags & ~FL_SLEEP;
3527 status = do_vfs_lock(request->fl_file, request);
3528 up_read(&nfsi->rwsem);
3529 goto out_unlock;
3530 }
3531 up_read(&nfsi->rwsem);
3532 }
6bfc93ef
TM		 3533 status = _nfs4_do_setlk(state, cmd, request, 0);
3534 if (status != 0)
01c3b861 3535 goto out_unlock;
6bfc93ef 3536 /* Note: we always want to sleep here! */
01c3b861 3537 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3538 if (do_vfs_lock(request->fl_file, request) < 0)
3539 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3540out_unlock:
1da177e4 3541 up_read(&clp->cl_sem);
01c3b861
TM		 3542out:
3543 request->fl_flags = fl_flags;
1da177e4
LT		 3544 return status;
3545}
3546
3547static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3548{
3549 struct nfs4_exception exception = { };
3550 int err;
3551
3552 do {
3553 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3554 _nfs4_proc_setlk(state, cmd, request),
3555 &exception);
3556 } while (exception.retry);
3557 return err;
3558}
3559
3560static int
3561nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3562{
3563 struct nfs_open_context *ctx;
3564 struct nfs4_state *state;
3565 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3566 int status;
3567
3568 /* verify open state */
cd3758e3 3569 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3570 state = ctx->state;
3571
3572 if (request->fl_start < 0 || request->fl_end < 0)
3573 return -EINVAL;
3574
3575 if (IS_GETLK(cmd))
3576 return nfs4_proc_getlk(state, F_GETLK, request);
3577
3578 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3579 return -EINVAL;
3580
3581 if (request->fl_type == F_UNLCK)
3582 return nfs4_proc_unlck(state, cmd, request);
3583
3584 do {
3585 status = nfs4_proc_setlk(state, cmd, request);
3586 if ((status != -EAGAIN) || IS_SETLK(cmd))
3587 break;
3588 timeout = nfs4_set_lock_task_retry(timeout);
3589 status = -ERESTARTSYS;
3590 if (signalled())
3591 break;
3592 } while(status < 0);
1da177e4
LT		 3593 return status;
3594}
3595
888e694c
TM		 3596int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3597{
3598 struct nfs_server *server = NFS_SERVER(state->inode);
3599 struct nfs4_exception exception = { };
3600 int err;
3601
3602 err = nfs4_set_lock_state(state, fl);
3603 if (err != 0)
3604 goto out;
3605 do {
3606 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3607 if (err != -NFS4ERR_DELAY)
3608 break;
3609 err = nfs4_handle_exception(server, err, &exception);
3610 } while (exception.retry);
3611out:
3612 return err;
3613}
6b3b5496 3614
aa1870af
BF		 3615#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3616
6b3b5496
BF		 3617int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3618 size_t buflen, int flags)
3619{
4b580ee3
BF		 3620 struct inode *inode = dentry->d_inode;
3621
3622 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3623 return -EOPNOTSUPP;
3624
3625 if (!S_ISREG(inode->i_mode) &&
3626 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3627 return -EPERM;
3628
3629 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3630}
3631
3632/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3633 * and that's what we'll do for e.g. user attributes that haven't been set.
3634 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3635 * attributes in kernel-managed attribute namespaces. */
3636ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3637 size_t buflen)
3638{
aa1870af
BF		 3639 struct inode *inode = dentry->d_inode;
3640
3641 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3642 return -EOPNOTSUPP;
3643
3644 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3645}
3646
3647ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3648{
aa1870af 3649 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3650
096455a2
BF		 3651 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3652 return 0;
6b3b5496
BF		 3653 if (buf && buflen < len)
3654 return -ERANGE;
3655 if (buf)
aa1870af
BF		 3656 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3657 return len;
6b3b5496
BF		 3658}
3659
56659e99 3660int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3661 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3662{
3663 struct nfs_server *server = NFS_SERVER(dir);
3664 u32 bitmask[2] = {
361e624f
MN		 3665 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3666 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3667 };
3668 struct nfs4_fs_locations_arg args = {
3669 .dir_fh = NFS_FH(dir),
c228fd3a 3670 .name = name,
683b57b4
TM		 3671 .page = page,
3672 .bitmask = bitmask,
3673 };
3674 struct rpc_message msg = {
3675 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3676 .rpc_argp = &args,
7aaa0b3b 3677 .rpc_resp = fs_locations,
683b57b4
TM		 3678 };
3679 int status;
3680
3681 dprintk("%s: start\n", __FUNCTION__);
c228fd3a 3682 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3683 fs_locations->server = server;
830b8e33 3684 fs_locations->nlocations = 0;
683b57b4
TM		 3685 status = rpc_call_sync(server->client, &msg, 0);
3686 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3687 return status;
3688}
3689
1da177e4
LT		 3690struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3691 .recover_open = nfs4_open_reclaim,
3692 .recover_lock = nfs4_lock_reclaim,
3693};
3694
3695struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3696 .recover_open = nfs4_open_expired,
3697 .recover_lock = nfs4_lock_expired,
3698};
3699
92e1d5be 3700static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3701 .permission = nfs_permission,
3702 .getattr = nfs_getattr,
3703 .setattr = nfs_setattr,
3704 .getxattr = nfs4_getxattr,
3705 .setxattr = nfs4_setxattr,
3706 .listxattr = nfs4_listxattr,
3707};
3708
509de811 3709const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3710 .version = 4, /* protocol version */
3711 .dentry_ops = &nfs4_dentry_operations,
3712 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3713 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3714 .getroot = nfs4_proc_get_root,
3715 .getattr = nfs4_proc_getattr,
3716 .setattr = nfs4_proc_setattr,
2b3de441 3717 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3718 .lookup = nfs4_proc_lookup,
3719 .access = nfs4_proc_access,
3720 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3721 .create = nfs4_proc_create,
3722 .remove = nfs4_proc_remove,
3723 .unlink_setup = nfs4_proc_unlink_setup,
3724 .unlink_done = nfs4_proc_unlink_done,
3725 .rename = nfs4_proc_rename,
3726 .link = nfs4_proc_link,
3727 .symlink = nfs4_proc_symlink,
3728 .mkdir = nfs4_proc_mkdir,
3729 .rmdir = nfs4_proc_remove,
3730 .readdir = nfs4_proc_readdir,
3731 .mknod = nfs4_proc_mknod,
3732 .statfs = nfs4_proc_statfs,
3733 .fsinfo = nfs4_proc_fsinfo,
3734 .pathconf = nfs4_proc_pathconf,
e9326dca 3735 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3736 .decode_dirent = nfs4_decode_dirent,
3737 .read_setup = nfs4_proc_read_setup,
ec06c096 3738 .read_done = nfs4_read_done,
1da177e4 3739 .write_setup = nfs4_proc_write_setup,
788e7a89 3740 .write_done = nfs4_write_done,
1da177e4 3741 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3742 .commit_done = nfs4_commit_done,
02a913a7
TM		 3743 .file_open = nfs_open,
3744 .file_release = nfs_release,
1da177e4 3745 .lock = nfs4_proc_lock,
e50a1c2e 3746 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3747};
3748
3749/*
3750 * Local variables:
3751 * c-basic-offset: 8
3752 * End:
3753 */
Linux 6.x block layer and io_uring tree(s)