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NFS: Clean up the write request locking.
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
006ea73e 54#include "iostat.h"
1da177e4
LT		 55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
2066fe89 58#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
cdd4e68b 61struct nfs4_opendata;
864472e9 62static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
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));
bb22629e 744 nfs_confirm_seqid(&data->owner->so_seqid, 0);
26e976a8 745 renew_lease(data->o_res.server, data->timestamp);
3e309914 746 data->rpc_done = 1;
26e976a8 747 }
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 761 goto out_free;
cdd4e68b 762 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 763 if (!IS_ERR(state))
4a35bd41 764 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 765out_free:
c6d00e63 766 nfs4_opendata_put(data);
cdd4e68b
TM		 767}
768
769static const struct rpc_call_ops nfs4_open_confirm_ops = {
770 .rpc_call_prepare = nfs4_open_confirm_prepare,
771 .rpc_call_done = nfs4_open_confirm_done,
772 .rpc_release = nfs4_open_confirm_release,
773};
774
775/*
776 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
777 */
778static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
779{
780 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
781 struct rpc_task *task;
1da177e4
LT		 782 int status;
783
c6d00e63 784 kref_get(&data->kref);
3e309914
TM		 785 data->rpc_done = 0;
786 data->rpc_status = 0;
cdd4e68b 787 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
7a1218a2 788 if (IS_ERR(task))
cdd4e68b 789 return PTR_ERR(task);
cdd4e68b
TM		 790 status = nfs4_wait_for_completion_rpc_task(task);
791 if (status != 0) {
792 data->cancelled = 1;
793 smp_wmb();
794 } else
795 status = data->rpc_status;
e6b3c4db 796 rpc_put_task(task);
1da177e4
LT		 797 return status;
798}
799
24ac23ab 800static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 801{
24ac23ab
TM		 802 struct nfs4_opendata *data = calldata;
803 struct nfs4_state_owner *sp = data->owner;
1da177e4
LT		 804 struct rpc_message msg = {
805 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
24ac23ab
TM		 806 .rpc_argp = &data->o_arg,
807 .rpc_resp = &data->o_res,
1da177e4
LT		 808 .rpc_cred = sp->so_cred,
809 };
24ac23ab
TM		 810
811 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
812 return;
aac00a8d
TM		 813 /*
814 * Check if we still need to send an OPEN call, or if we can use
815 * a delegation instead.
816 */
817 if (data->state != NULL) {
818 struct nfs_delegation *delegation;
819
6ee41268
TM		 820 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
821 goto out_no_action;
aac00a8d
TM		 822 rcu_read_lock();
823 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
824 if (delegation != NULL &&
825 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
826 rcu_read_unlock();
6ee41268 827 goto out_no_action;
aac00a8d
TM		 828 }
829 rcu_read_unlock();
830 }
24ac23ab 831 /* Update sequence id. */
9f958ab8 832 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 833 data->o_arg.clientid = sp->so_client->cl_clientid;
6f220ed5 834 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
864472e9 835 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
6f220ed5
TM		 836 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
837 }
26e976a8 838 data->timestamp = jiffies;
24ac23ab 839 rpc_call_setup(task, &msg, 0);
6ee41268
TM		 840 return;
841out_no_action:
842 task->tk_action = NULL;
843
24ac23ab 844}
1da177e4 845
24ac23ab
TM		 846static void nfs4_open_done(struct rpc_task *task, void *calldata)
847{
848 struct nfs4_opendata *data = calldata;
1da177e4 849
24ac23ab
TM		 850 data->rpc_status = task->tk_status;
851 if (RPC_ASSASSINATED(task))
852 return;
853 if (task->tk_status == 0) {
854 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 855 case S_IFREG:
856 break;
857 case S_IFLNK:
24ac23ab 858 data->rpc_status = -ELOOP;
6f926b5b
TM		 859 break;
860 case S_IFDIR:
24ac23ab 861 data->rpc_status = -EISDIR;
6f926b5b
TM		 862 break;
863 default:
24ac23ab 864 data->rpc_status = -ENOTDIR;
6f926b5b 865 }
26e976a8 866 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 867 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
868 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 869 }
24ac23ab 870 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
3e309914 871 data->rpc_done = 1;
24ac23ab 872}
6f926b5b 873
24ac23ab
TM		 874static void nfs4_open_release(void *calldata)
875{
876 struct nfs4_opendata *data = calldata;
877 struct nfs4_state *state = NULL;
878
879 /* If this request hasn't been cancelled, do nothing */
880 if (data->cancelled == 0)
881 goto out_free;
882 /* In case of error, no cleanup! */
3e309914 883 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 884 goto out_free;
885 /* In case we need an open_confirm, no cleanup! */
886 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
887 goto out_free;
24ac23ab 888 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 889 if (!IS_ERR(state))
4a35bd41 890 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 891out_free:
c6d00e63 892 nfs4_opendata_put(data);
24ac23ab
TM		 893}
894
895static const struct rpc_call_ops nfs4_open_ops = {
896 .rpc_call_prepare = nfs4_open_prepare,
897 .rpc_call_done = nfs4_open_done,
898 .rpc_release = nfs4_open_release,
899};
900
901/*
902 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
903 */
904static int _nfs4_proc_open(struct nfs4_opendata *data)
905{
906 struct inode *dir = data->dir->d_inode;
907 struct nfs_server *server = NFS_SERVER(dir);
908 struct nfs_openargs *o_arg = &data->o_arg;
909 struct nfs_openres *o_res = &data->o_res;
910 struct rpc_task *task;
911 int status;
912
c6d00e63 913 kref_get(&data->kref);
3e309914
TM		 914 data->rpc_done = 0;
915 data->rpc_status = 0;
2ced46c2 916 data->cancelled = 0;
24ac23ab 917 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
7a1218a2 918 if (IS_ERR(task))
24ac23ab 919 return PTR_ERR(task);
24ac23ab
TM		 920 status = nfs4_wait_for_completion_rpc_task(task);
921 if (status != 0) {
922 data->cancelled = 1;
923 smp_wmb();
924 } else
925 status = data->rpc_status;
e6b3c4db 926 rpc_put_task(task);
3e309914 927 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 928 return status;
929
9936781d
TM		 930 if (o_res->fh.size == 0)
931 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
932
56ae19f3
TM		 933 if (o_arg->open_flags & O_CREAT) {
934 update_changeattr(dir, &o_res->cinfo);
935 nfs_post_op_update_inode(dir, o_res->dir_attr);
936 } else
937 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 938 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 939 status = _nfs4_proc_open_confirm(data);
1da177e4 940 if (status != 0)
24ac23ab 941 return status;
1da177e4
LT		 942 }
943 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
9936781d 944 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 945 return 0;
1da177e4
LT		 946}
947
10afec90 948static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 949{
7539bbab 950 struct nfs_client *clp = server->nfs_client;
6b30954e 951 int ret;
58d9714a 952
6b30954e
TM		 953 for (;;) {
954 ret = nfs4_wait_clnt_recover(server->client, clp);
955 if (ret != 0)
956 return ret;
957 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
958 break;
58d9714a 959 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 960 }
961 return 0;
58d9714a
TM		 962}
963
1da177e4
LT		 964/*
965 * OPEN_EXPIRED:
966 * reclaim state on the server after a network partition.
967 * Assumes caller holds the appropriate lock
968 */
539cd03a 969static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 970{
e56e0b78 971 struct nfs4_opendata *opendata;
864472e9 972 int ret;
1da177e4 973
6f220ed5
TM		 974 opendata = nfs4_open_recoverdata_alloc(ctx, state);
975 if (IS_ERR(opendata))
976 return PTR_ERR(opendata);
864472e9
TM		 977 ret = nfs4_open_recover(opendata, state);
978 if (ret == -ESTALE) {
979 /* Invalidate the state owner so we don't ever use it again */
539cd03a
TM		 980 nfs4_drop_state_owner(state->owner);
981 d_drop(ctx->path.dentry);
1da177e4 982 }
c6d00e63 983 nfs4_opendata_put(opendata);
864472e9 984 return ret;
1da177e4
LT		 985}
986
539cd03a 987static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 988{
539cd03a 989 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 990 struct nfs4_exception exception = { };
991 int err;
992
993 do {
539cd03a 994 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 995 if (err == -NFS4ERR_DELAY)
996 nfs4_handle_exception(server, err, &exception);
997 } while (exception.retry);
998 return err;
999}
1000
1da177e4
LT		 1001static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1002{
1da177e4 1003 struct nfs_open_context *ctx;
864472e9 1004 int ret;
1da177e4 1005
864472e9
TM		 1006 ctx = nfs4_state_find_open_context(state);
1007 if (IS_ERR(ctx))
1008 return PTR_ERR(ctx);
539cd03a 1009 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1010 put_nfs_open_context(ctx);
1011 return ret;
1da177e4
LT		 1012}
1013
aa53ed54
JL		 1014/*
1015 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1016 * fields corresponding to attributes that were used to store the verifier.
1017 * Make sure we clobber those fields in the later setattr call
1018 */
1019static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1020{
1021 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1022 !(sattr->ia_valid & ATTR_ATIME_SET))
1023 sattr->ia_valid |= ATTR_ATIME;
1024
1025 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1026 !(sattr->ia_valid & ATTR_MTIME_SET))
1027 sattr->ia_valid |= ATTR_MTIME;
1028}
1029
1da177e4 1030/*
24ac23ab 1031 * Returns a referenced nfs4_state
1da177e4 1032 */
ad389da7 1033static 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		 1034{
1035 struct nfs4_state_owner *sp;
1036 struct nfs4_state *state = NULL;
1037 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 1038 struct nfs_client *clp = server->nfs_client;
e56e0b78 1039 struct nfs4_opendata *opendata;
aac00a8d 1040 int status;
1da177e4
LT		 1041
1042 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1043 status = -ENOMEM;
1044 if (!(sp = nfs4_get_state_owner(server, cred))) {
1045 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1046 goto out_err;
1047 }
58d9714a
TM		 1048 status = nfs4_recover_expired_lease(server);
1049 if (status != 0)
b4454fe1 1050 goto err_put_state_owner;
aac00a8d
TM		 1051 if (path->dentry->d_inode != NULL)
1052 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a
TM		 1053 down_read(&clp->cl_sem);
1054 status = -ENOMEM;
ad389da7 1055 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1056 if (opendata == NULL)
76723de0 1057 goto err_release_rwsem;
1da177e4 1058
aac00a8d
TM		 1059 if (path->dentry->d_inode != NULL)
1060 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1061
24ac23ab 1062 status = _nfs4_proc_open(opendata);
1da177e4 1063 if (status != 0)
c6d00e63 1064 goto err_opendata_put;
1da177e4 1065
aa53ed54
JL		 1066 if (opendata->o_arg.open_flags & O_EXCL)
1067 nfs4_exclusive_attrset(opendata, sattr);
1068
24ac23ab 1069 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1070 status = PTR_ERR(state);
1071 if (IS_ERR(state))
c6d00e63 1072 goto err_opendata_put;
c6d00e63 1073 nfs4_opendata_put(opendata);
1da177e4
LT		 1074 nfs4_put_state_owner(sp);
1075 up_read(&clp->cl_sem);
1076 *res = state;
1077 return 0;
c6d00e63
TM		 1078err_opendata_put:
1079 nfs4_opendata_put(opendata);
76723de0
TM		 1080err_release_rwsem:
1081 up_read(&clp->cl_sem);
e56e0b78
TM		 1082err_put_state_owner:
1083 nfs4_put_state_owner(sp);
1da177e4 1084out_err:
1da177e4
LT		 1085 *res = NULL;
1086 return status;
1087}
1088
1089
ad389da7 1090static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1091{
1092 struct nfs4_exception exception = { };
1093 struct nfs4_state *res;
1094 int status;
1095
1096 do {
ad389da7 1097 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1098 if (status == 0)
1099 break;
1100 /* NOTE: BAD_SEQID means the server and client disagree about the
1101 * book-keeping w.r.t. state-changing operations
1102 * (OPEN/CLOSE/LOCK/LOCKU...)
1103 * It is actually a sign of a bug on the client or on the server.
1104 *
1105 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1106 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1107 * have unhashed the old state_owner for us, and that we can
1108 * therefore safely retry using a new one. We should still warn
1109 * the user though...
1110 */
1111 if (status == -NFS4ERR_BAD_SEQID) {
6f43ddcc
TM		 1112 printk(KERN_WARNING "NFS: v4 server %s "
1113 " returned a bad sequence-id error!\n",
1114 NFS_SERVER(dir)->nfs_client->cl_hostname);
1da177e4
LT		 1115 exception.retry = 1;
1116 continue;
1117 }
550f5747
TM		 1118 /*
1119 * BAD_STATEID on OPEN means that the server cancelled our
1120 * state before it received the OPEN_CONFIRM.
1121 * Recover by retrying the request as per the discussion
1122 * on Page 181 of RFC3530.
1123 */
1124 if (status == -NFS4ERR_BAD_STATEID) {
1125 exception.retry = 1;
1126 continue;
1127 }
aac00a8d
TM		 1128 if (status == -EAGAIN) {
1129 /* We must have found a delegation */
1130 exception.retry = 1;
1131 continue;
1132 }
1da177e4
LT		 1133 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1134 status, &exception));
1135 } while (exception.retry);
1136 return res;
1137}
1138
3e4f6290
TM		 1139static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1140 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1141{
3e4f6290 1142 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1143 struct nfs_setattrargs arg = {
3e4f6290 1144 .fh = NFS_FH(inode),
1da177e4
LT		 1145 .iap = sattr,
1146 .server = server,
1147 .bitmask = server->attr_bitmask,
1148 };
1149 struct nfs_setattrres res = {
1150 .fattr = fattr,
1151 .server = server,
1152 };
1153 struct rpc_message msg = {
1154 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1155 .rpc_argp = &arg,
1156 .rpc_resp = &res,
1157 };
26e976a8 1158 unsigned long timestamp = jiffies;
65e4308d 1159 int status;
1da177e4 1160
0e574af1 1161 nfs_fattr_init(fattr);
1da177e4 1162
3e4f6290
TM		 1163 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1164 /* Use that stateid */
1165 } else if (state != NULL) {
1da177e4 1166 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1167 nfs4_copy_stateid(&arg.stateid, state, current->files);
1168 } else
1da177e4
LT		 1169 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1170
65e4308d 1171 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1172 if (status == 0 && state != NULL)
1173 renew_lease(server, timestamp);
65e4308d 1174 return status;
1da177e4
LT		 1175}
1176
3e4f6290
TM		 1177static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1178 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1179{
3e4f6290 1180 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1181 struct nfs4_exception exception = { };
1182 int err;
1183 do {
1184 err = nfs4_handle_exception(server,
3e4f6290 1185 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1186 &exception);
1187 } while (exception.retry);
1188 return err;
1189}
1190
1191struct nfs4_closedata {
4a35bd41 1192 struct path path;
1da177e4
LT		 1193 struct inode *inode;
1194 struct nfs4_state *state;
1195 struct nfs_closeargs arg;
1196 struct nfs_closeres res;
516a6af6 1197 struct nfs_fattr fattr;
26e976a8 1198 unsigned long timestamp;
1da177e4
LT		 1199};
1200
963d8fe5 1201static void nfs4_free_closedata(void *data)
9512135d 1202{
963d8fe5
TM		 1203 struct nfs4_closedata *calldata = data;
1204 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1205
1206 nfs4_put_open_state(calldata->state);
1207 nfs_free_seqid(calldata->arg.seqid);
9512135d 1208 nfs4_put_state_owner(sp);
4a35bd41
TM		 1209 dput(calldata->path.dentry);
1210 mntput(calldata->path.mnt);
9512135d
TM		 1211 kfree(calldata);
1212}
1213
963d8fe5 1214static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1215{
963d8fe5 1216 struct nfs4_closedata *calldata = data;
1da177e4 1217 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1218 struct nfs_server *server = NFS_SERVER(calldata->inode);
1219
4ce70ada
TM		 1220 if (RPC_ASSASSINATED(task))
1221 return;
1da177e4
LT		 1222 /* hmm. we are done with the inode, and in the process of freeing
1223 * the state_owner. we keep this around to process errors
1224 */
cee54fc9 1225 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1226 switch (task->tk_status) {
1227 case 0:
45328c35 1228 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
26e976a8 1229 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1230 break;
1231 case -NFS4ERR_STALE_STATEID:
1232 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1233 break;
1234 default:
1235 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1236 rpc_restart_call(task);
1237 return;
1238 }
1239 }
516a6af6 1240 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1241}
1242
4ce70ada 1243static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1244{
4ce70ada 1245 struct nfs4_closedata *calldata = data;
9512135d 1246 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1247 struct rpc_message msg = {
1248 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1249 .rpc_argp = &calldata->arg,
1250 .rpc_resp = &calldata->res,
9512135d 1251 .rpc_cred = state->owner->so_cred,
1da177e4 1252 };
003707c7 1253 int clear_rd, clear_wr, clear_rdwr;
9512135d 1254
963d8fe5 1255 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1256 return;
003707c7 1257
003707c7 1258 clear_rd = clear_wr = clear_rdwr = 0;
4cecb76f 1259 spin_lock(&state->owner->so_lock);
003707c7 1260 /* Calculate the change in open mode */
e7616923 1261 if (state->n_rdwr == 0) {
003707c7 1262 if (state->n_rdonly == 0) {
003707c7
TM		 1263 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1264 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1265 }
1266 if (state->n_wronly == 0) {
003707c7
TM		 1267 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1268 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1269 }
e7616923 1270 }
4cecb76f 1271 spin_unlock(&state->owner->so_lock);
003707c7 1272 if (!clear_rd && !clear_wr && !clear_rdwr) {
963d8fe5
TM		 1273 /* Note: exit _without_ calling nfs4_close_done */
1274 task->tk_action = NULL;
9512135d
TM		 1275 return;
1276 }
516a6af6 1277 nfs_fattr_init(calldata->res.fattr);
45328c35 1278 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1da177e4 1279 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1280 calldata->arg.open_flags = FMODE_READ;
1281 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1282 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1283 calldata->arg.open_flags = FMODE_WRITE;
1284 }
26e976a8 1285 calldata->timestamp = jiffies;
9512135d 1286 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1287}
1288
963d8fe5 1289static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1290 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1291 .rpc_call_done = nfs4_close_done,
1292 .rpc_release = nfs4_free_closedata,
1293};
1294
1da177e4
LT		 1295/*
1296 * It is possible for data to be read/written from a mem-mapped file
1297 * after the sys_close call (which hits the vfs layer as a flush).
1298 * This means that we can't safely call nfsv4 close on a file until
1299 * the inode is cleared. This in turn means that we are not good
1300 * NFSv4 citizens - we do not indicate to the server to update the file's
1301 * share state even when we are done with one of the three share
1302 * stateid's in the inode.
1303 *
1304 * NOTE: Caller must be holding the sp->so_owner semaphore!
1305 */
a49c3c77 1306int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1da177e4 1307{
4a35bd41 1308 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4 1309 struct nfs4_closedata *calldata;
b39e625b
TM		 1310 struct nfs4_state_owner *sp = state->owner;
1311 struct rpc_task *task;
9512135d 1312 int status = -ENOMEM;
1da177e4 1313
9512135d 1314 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1315 if (calldata == NULL)
9512135d 1316 goto out;
4a35bd41 1317 calldata->inode = state->inode;
1da177e4 1318 calldata->state = state;
4a35bd41 1319 calldata->arg.fh = NFS_FH(state->inode);
003707c7 1320 calldata->arg.stateid = &state->open_stateid;
1da177e4 1321 /* Serialization for the sequence id */
cee54fc9 1322 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1323 if (calldata->arg.seqid == NULL)
1324 goto out_free_calldata;
516a6af6
TM		 1325 calldata->arg.bitmask = server->attr_bitmask;
1326 calldata->res.fattr = &calldata->fattr;
1327 calldata->res.server = server;
4a35bd41
TM		 1328 calldata->path.mnt = mntget(path->mnt);
1329 calldata->path.dentry = dget(path->dentry);
9512135d 1330
b39e625b
TM		 1331 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1332 if (IS_ERR(task))
1333 return PTR_ERR(task);
a49c3c77
TM		 1334 status = 0;
1335 if (wait)
1336 status = rpc_wait_for_completion_task(task);
b39e625b 1337 rpc_put_task(task);
a49c3c77 1338 return status;
9512135d
TM		 1339out_free_calldata:
1340 kfree(calldata);
1341out:
b39e625b
TM		 1342 nfs4_put_open_state(state);
1343 nfs4_put_state_owner(sp);
9512135d 1344 return status;
1da177e4
LT		 1345}
1346
4a35bd41 1347static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
02a913a7
TM		 1348{
1349 struct file *filp;
1b45c46c 1350 int ret;
02a913a7 1351
1b45c46c
TM		 1352 /* If the open_intent is for execute, we have an extra check to make */
1353 if (nd->intent.open.flags & FMODE_EXEC) {
af22f94a 1354 ret = nfs_may_open(state->inode,
1b45c46c
TM		 1355 state->owner->so_cred,
1356 nd->intent.open.flags);
1357 if (ret < 0)
1358 goto out_close;
1359 }
4a35bd41 1360 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
02a913a7
TM		 1361 if (!IS_ERR(filp)) {
1362 struct nfs_open_context *ctx;
cd3758e3 1363 ctx = nfs_file_open_context(filp);
02a913a7 1364 ctx->state = state;
95cf959b
TM		 1365 return 0;
1366 }
1b45c46c
TM		 1367 ret = PTR_ERR(filp);
1368out_close:
a49c3c77 1369 nfs4_close_sync(path, state, nd->intent.open.flags);
1b45c46c 1370 return ret;
02a913a7
TM		 1371}
1372
1373struct dentry *
1da177e4
LT		 1374nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1375{
565277f6 1376 struct dentry *parent;
ad389da7
TM		 1377 struct path path = {
1378 .mnt = nd->mnt,
1379 .dentry = dentry,
1380 };
1da177e4
LT		 1381 struct iattr attr;
1382 struct rpc_cred *cred;
1383 struct nfs4_state *state;
02a913a7 1384 struct dentry *res;
1da177e4
LT		 1385
1386 if (nd->flags & LOOKUP_CREATE) {
1387 attr.ia_mode = nd->intent.open.create_mode;
1388 attr.ia_valid = ATTR_MODE;
1389 if (!IS_POSIXACL(dir))
1390 attr.ia_mode &= ~current->fs->umask;
1391 } else {
1392 attr.ia_valid = 0;
1393 BUG_ON(nd->intent.open.flags & O_CREAT);
1394 }
1395
1f163415 1396 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1397 if (IS_ERR(cred))
02a913a7 1398 return (struct dentry *)cred;
565277f6
TM		 1399 parent = dentry->d_parent;
1400 /* Protect against concurrent sillydeletes */
1401 nfs_block_sillyrename(parent);
ad389da7 1402 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1403 put_rpccred(cred);
02a913a7 1404 if (IS_ERR(state)) {
d75340cc 1405 if (PTR_ERR(state) == -ENOENT) {
02a913a7 1406 d_add(dentry, NULL);
d75340cc
TM		 1407 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1408 }
565277f6 1409 nfs_unblock_sillyrename(parent);
02a913a7
TM		 1410 return (struct dentry *)state;
1411 }
24ac23ab 1412 res = d_add_unique(dentry, igrab(state->inode));
02a913a7 1413 if (res != NULL)
deee9369 1414 path.dentry = res;
d75340cc 1415 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
565277f6 1416 nfs_unblock_sillyrename(parent);
4a35bd41 1417 nfs4_intent_set_file(nd, &path, state);
02a913a7 1418 return res;
1da177e4
LT		 1419}
1420
1421int
02a913a7 1422nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1423{
ad389da7
TM		 1424 struct path path = {
1425 .mnt = nd->mnt,
1426 .dentry = dentry,
1427 };
1da177e4
LT		 1428 struct rpc_cred *cred;
1429 struct nfs4_state *state;
1da177e4 1430
1f163415 1431 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1432 if (IS_ERR(cred))
1433 return PTR_ERR(cred);
aac00a8d 1434 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1435 put_rpccred(cred);
02a913a7
TM		 1436 if (IS_ERR(state)) {
1437 switch (PTR_ERR(state)) {
1438 case -EPERM:
1439 case -EACCES:
1440 case -EDQUOT:
1441 case -ENOSPC:
1442 case -EROFS:
1443 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1444 return 1;
b87c0adf
CL		 1445 default:
1446 goto out_drop;
02a913a7 1447 }
02a913a7 1448 }
24ac23ab 1449 if (state->inode == dentry->d_inode) {
d75340cc 1450 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
4a35bd41 1451 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1452 return 1;
1453 }
a49c3c77 1454 nfs4_close_sync(&path, state, openflags);
02a913a7
TM		 1455out_drop:
1456 d_drop(dentry);
1da177e4
LT		 1457 return 0;
1458}
1459
1460
1461static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1462{
1463 struct nfs4_server_caps_res res = {};
1464 struct rpc_message msg = {
1465 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1466 .rpc_argp = fhandle,
1467 .rpc_resp = &res,
1468 };
1469 int status;
1470
1471 status = rpc_call_sync(server->client, &msg, 0);
1472 if (status == 0) {
1473 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1474 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1475 server->caps |= NFS_CAP_ACLS;
1476 if (res.has_links != 0)
1477 server->caps |= NFS_CAP_HARDLINKS;
1478 if (res.has_symlinks != 0)
1479 server->caps |= NFS_CAP_SYMLINKS;
1480 server->acl_bitmask = res.acl_bitmask;
1481 }
1482 return status;
1483}
1484
55a97593 1485int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1486{
1487 struct nfs4_exception exception = { };
1488 int err;
1489 do {
1490 err = nfs4_handle_exception(server,
1491 _nfs4_server_capabilities(server, fhandle),
1492 &exception);
1493 } while (exception.retry);
1494 return err;
1495}
1496
1497static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1498 struct nfs_fsinfo *info)
1499{
1da177e4
LT		 1500 struct nfs4_lookup_root_arg args = {
1501 .bitmask = nfs4_fattr_bitmap,
1502 };
1503 struct nfs4_lookup_res res = {
1504 .server = server,
0e574af1 1505 .fattr = info->fattr,
1da177e4
LT		 1506 .fh = fhandle,
1507 };
1508 struct rpc_message msg = {
1509 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1510 .rpc_argp = &args,
1511 .rpc_resp = &res,
1512 };
0e574af1 1513 nfs_fattr_init(info->fattr);
1da177e4
LT		 1514 return rpc_call_sync(server->client, &msg, 0);
1515}
1516
1517static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1518 struct nfs_fsinfo *info)
1519{
1520 struct nfs4_exception exception = { };
1521 int err;
1522 do {
1523 err = nfs4_handle_exception(server,
1524 _nfs4_lookup_root(server, fhandle, info),
1525 &exception);
1526 } while (exception.retry);
1527 return err;
1528}
1529
54ceac45
DH		 1530/*
1531 * get the file handle for the "/" directory on the server
1532 */
1da177e4 1533static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1534 struct nfs_fsinfo *info)
1da177e4 1535{
1da177e4
LT		 1536 int status;
1537
1da177e4 1538 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1539 if (status == 0)
1540 status = nfs4_server_capabilities(server, fhandle);
1541 if (status == 0)
1542 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1543 return nfs4_map_errors(status);
1da177e4
LT		 1544}
1545
6b97fd3d
MN		 1546/*
1547 * Get locations and (maybe) other attributes of a referral.
1548 * Note that we'll actually follow the referral later when
1549 * we detect fsid mismatch in inode revalidation
1550 */
56659e99 1551static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
6b97fd3d
MN		 1552{
1553 int status = -ENOMEM;
1554 struct page *page = NULL;
1555 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1556
1557 page = alloc_page(GFP_KERNEL);
1558 if (page == NULL)
1559 goto out;
1560 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1561 if (locations == NULL)
1562 goto out;
1563
c228fd3a 1564 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1565 if (status != 0)
1566 goto out;
1567 /* Make sure server returned a different fsid for the referral */
1568 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1569 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1570 status = -EIO;
1571 goto out;
1572 }
1573
1574 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1575 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1576 if (!fattr->mode)
1577 fattr->mode = S_IFDIR;
1578 memset(fhandle, 0, sizeof(struct nfs_fh));
1579out:
1580 if (page)
1581 __free_page(page);
1582 if (locations)
1583 kfree(locations);
1584 return status;
1585}
1586
1da177e4
LT		 1587static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1588{
1589 struct nfs4_getattr_arg args = {
1590 .fh = fhandle,
1591 .bitmask = server->attr_bitmask,
1592 };
1593 struct nfs4_getattr_res res = {
1594 .fattr = fattr,
1595 .server = server,
1596 };
1597 struct rpc_message msg = {
1598 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1599 .rpc_argp = &args,
1600 .rpc_resp = &res,
1601 };
1602
0e574af1 1603 nfs_fattr_init(fattr);
1da177e4
LT		 1604 return rpc_call_sync(server->client, &msg, 0);
1605}
1606
1607static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1608{
1609 struct nfs4_exception exception = { };
1610 int err;
1611 do {
1612 err = nfs4_handle_exception(server,
1613 _nfs4_proc_getattr(server, fhandle, fattr),
1614 &exception);
1615 } while (exception.retry);
1616 return err;
1617}
1618
1619/*
1620 * The file is not closed if it is opened due to the a request to change
1621 * the size of the file. The open call will not be needed once the
1622 * VFS layer lookup-intents are implemented.
1623 *
1624 * Close is called when the inode is destroyed.
1625 * If we haven't opened the file for O_WRONLY, we
1626 * need to in the size_change case to obtain a stateid.
1627 *
1628 * Got race?
1629 * Because OPEN is always done by name in nfsv4, it is
1630 * possible that we opened a different file by the same
1631 * name. We can recognize this race condition, but we
1632 * can't do anything about it besides returning an error.
1633 *
1634 * This will be fixed with VFS changes (lookup-intent).
1635 */
1636static int
1637nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1638 struct iattr *sattr)
1639{
08e9eac4
TM		 1640 struct rpc_cred *cred;
1641 struct inode *inode = dentry->d_inode;
d530838b
TM		 1642 struct nfs_open_context *ctx;
1643 struct nfs4_state *state = NULL;
1da177e4
LT		 1644 int status;
1645
0e574af1 1646 nfs_fattr_init(fattr);
1da177e4 1647
1f163415 1648 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1649 if (IS_ERR(cred))
1650 return PTR_ERR(cred);
d530838b
TM		 1651
1652 /* Search for an existing open(O_WRITE) file */
1653 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1654 if (ctx != NULL)
1655 state = ctx->state;
08e9eac4 1656
3e4f6290 1657 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1658 if (status == 0)
1659 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1660 if (ctx != NULL)
1661 put_nfs_open_context(ctx);
08e9eac4 1662 put_rpccred(cred);
1da177e4
LT		 1663 return status;
1664}
1665
56659e99
TM		 1666static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1667 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1668 struct nfs_fattr *fattr)
1669{
1670 int status;
1671 struct nfs4_lookup_arg args = {
1672 .bitmask = server->attr_bitmask,
1673 .dir_fh = dirfh,
1674 .name = name,
1675 };
1676 struct nfs4_lookup_res res = {
1677 .server = server,
1678 .fattr = fattr,
1679 .fh = fhandle,
1680 };
1681 struct rpc_message msg = {
1682 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1683 .rpc_argp = &args,
1684 .rpc_resp = &res,
1685 };
1686
1687 nfs_fattr_init(fattr);
1688
1689 dprintk("NFS call lookupfh %s\n", name->name);
1690 status = rpc_call_sync(server->client, &msg, 0);
1691 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1692 return status;
1693}
1694
1695static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1696 struct qstr *name, struct nfs_fh *fhandle,
1697 struct nfs_fattr *fattr)
1698{
1699 struct nfs4_exception exception = { };
1700 int err;
1701 do {
4e56e082
TM		 1702 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1703 /* FIXME: !!!! */
1704 if (err == -NFS4ERR_MOVED) {
1705 err = -EREMOTE;
1706 break;
1707 }
1708 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1709 } while (exception.retry);
1710 return err;
1711}
1712
56659e99 1713static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1714 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1715{
4e56e082 1716 int status;
1da177e4
LT		 1717
1718 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1719 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1720 if (status == -NFS4ERR_MOVED)
1721 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1722 dprintk("NFS reply lookup: %d\n", status);
1723 return status;
1724}
1725
1726static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1727{
1728 struct nfs4_exception exception = { };
1729 int err;
1730 do {
1731 err = nfs4_handle_exception(NFS_SERVER(dir),
1732 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1733 &exception);
1734 } while (exception.retry);
1735 return err;
1736}
1737
1738static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1739{
76b32999
TM		 1740 struct nfs_server *server = NFS_SERVER(inode);
1741 struct nfs_fattr fattr;
1da177e4
LT		 1742 struct nfs4_accessargs args = {
1743 .fh = NFS_FH(inode),
76b32999
TM		 1744 .bitmask = server->attr_bitmask,
1745 };
1746 struct nfs4_accessres res = {
1747 .server = server,
1748 .fattr = &fattr,
1da177e4 1749 };
1da177e4
LT		 1750 struct rpc_message msg = {
1751 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1752 .rpc_argp = &args,
1753 .rpc_resp = &res,
1754 .rpc_cred = entry->cred,
1755 };
1756 int mode = entry->mask;
1757 int status;
1758
1759 /*
1760 * Determine which access bits we want to ask for...
1761 */
1762 if (mode & MAY_READ)
1763 args.access |= NFS4_ACCESS_READ;
1764 if (S_ISDIR(inode->i_mode)) {
1765 if (mode & MAY_WRITE)
1766 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1767 if (mode & MAY_EXEC)
1768 args.access |= NFS4_ACCESS_LOOKUP;
1769 } else {
1770 if (mode & MAY_WRITE)
1771 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1772 if (mode & MAY_EXEC)
1773 args.access |= NFS4_ACCESS_EXECUTE;
1774 }
76b32999 1775 nfs_fattr_init(&fattr);
1da177e4
LT		 1776 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1777 if (!status) {
1778 entry->mask = 0;
1779 if (res.access & NFS4_ACCESS_READ)
1780 entry->mask |= MAY_READ;
1781 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1782 entry->mask |= MAY_WRITE;
1783 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1784 entry->mask |= MAY_EXEC;
76b32999 1785 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1786 }
1787 return status;
1788}
1789
1790static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1791{
1792 struct nfs4_exception exception = { };
1793 int err;
1794 do {
1795 err = nfs4_handle_exception(NFS_SERVER(inode),
1796 _nfs4_proc_access(inode, entry),
1797 &exception);
1798 } while (exception.retry);
1799 return err;
1800}
1801
1802/*
1803 * TODO: For the time being, we don't try to get any attributes
1804 * along with any of the zero-copy operations READ, READDIR,
1805 * READLINK, WRITE.
1806 *
1807 * In the case of the first three, we want to put the GETATTR
1808 * after the read-type operation -- this is because it is hard
1809 * to predict the length of a GETATTR response in v4, and thus
1810 * align the READ data correctly. This means that the GETATTR
1811 * may end up partially falling into the page cache, and we should
1812 * shift it into the 'tail' of the xdr_buf before processing.
1813 * To do this efficiently, we need to know the total length
1814 * of data received, which doesn't seem to be available outside
1815 * of the RPC layer.
1816 *
1817 * In the case of WRITE, we also want to put the GETATTR after
1818 * the operation -- in this case because we want to make sure
1819 * we get the post-operation mtime and size. This means that
1820 * we can't use xdr_encode_pages() as written: we need a variant
1821 * of it which would leave room in the 'tail' iovec.
1822 *
1823 * Both of these changes to the XDR layer would in fact be quite
1824 * minor, but I decided to leave them for a subsequent patch.
1825 */
1826static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1827 unsigned int pgbase, unsigned int pglen)
1828{
1829 struct nfs4_readlink args = {
1830 .fh = NFS_FH(inode),
1831 .pgbase = pgbase,
1832 .pglen = pglen,
1833 .pages = &page,
1834 };
1835 struct rpc_message msg = {
1836 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1837 .rpc_argp = &args,
1838 .rpc_resp = NULL,
1839 };
1840
1841 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1842}
1843
1844static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1845 unsigned int pgbase, unsigned int pglen)
1846{
1847 struct nfs4_exception exception = { };
1848 int err;
1849 do {
1850 err = nfs4_handle_exception(NFS_SERVER(inode),
1851 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1852 &exception);
1853 } while (exception.retry);
1854 return err;
1855}
1856
1da177e4
LT		 1857/*
1858 * Got race?
1859 * We will need to arrange for the VFS layer to provide an atomic open.
1860 * Until then, this create/open method is prone to inefficiency and race
1861 * conditions due to the lookup, create, and open VFS calls from sys_open()
1862 * placed on the wire.
1863 *
1864 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1865 * The file will be opened again in the subsequent VFS open call
1866 * (nfs4_proc_file_open).
1867 *
1868 * The open for read will just hang around to be used by any process that
1869 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1870 */
1871
1872static int
1873nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1874 int flags, struct nameidata *nd)
1da177e4 1875{
ad389da7
TM		 1876 struct path path = {
1877 .mnt = nd->mnt,
1878 .dentry = dentry,
1879 };
1da177e4
LT		 1880 struct nfs4_state *state;
1881 struct rpc_cred *cred;
1882 int status = 0;
1883
1f163415 1884 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1885 if (IS_ERR(cred)) {
1886 status = PTR_ERR(cred);
1887 goto out;
1888 }
ad389da7 1889 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1da177e4 1890 put_rpccred(cred);
d4d9cdcb 1891 d_drop(dentry);
1da177e4
LT		 1892 if (IS_ERR(state)) {
1893 status = PTR_ERR(state);
1894 goto out;
1895 }
d4d9cdcb 1896 d_add(dentry, igrab(state->inode));
d75340cc 1897 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 1898 if (flags & O_EXCL) {
1899 struct nfs_fattr fattr;
3e4f6290 1900 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1901 if (status == 0)
65e4308d 1902 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1903 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1904 }
ad389da7 1905 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1906 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1907 else
a49c3c77 1908 nfs4_close_sync(&path, state, flags);
1da177e4
LT		 1909out:
1910 return status;
1911}
1912
1913static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1914{
16e42959 1915 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 1916 struct nfs_removeargs args = {
1da177e4 1917 .fh = NFS_FH(dir),
4fdc17b2
TM		 1918 .name.len = name->len,
1919 .name.name = name->name,
16e42959
TM		 1920 .bitmask = server->attr_bitmask,
1921 };
4fdc17b2 1922 struct nfs_removeres res = {
16e42959 1923 .server = server,
1da177e4 1924 };
1da177e4 1925 struct rpc_message msg = {
4fdc17b2
TM		 1926 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1927 .rpc_argp = &args,
1928 .rpc_resp = &res,
1da177e4
LT		 1929 };
1930 int status;
1931
4fdc17b2 1932 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 1933 status = rpc_call_sync(server->client, &msg, 0);
1934 if (status == 0) {
1935 update_changeattr(dir, &res.cinfo);
4fdc17b2 1936 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 1937 }
1da177e4
LT		 1938 return status;
1939}
1940
1941static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1942{
1943 struct nfs4_exception exception = { };
1944 int err;
1945 do {
1946 err = nfs4_handle_exception(NFS_SERVER(dir),
1947 _nfs4_proc_remove(dir, name),
1948 &exception);
1949 } while (exception.retry);
1950 return err;
1951}
1952
e4eff1a6 1953static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 1954{
e4eff1a6
TM		 1955 struct nfs_server *server = NFS_SERVER(dir);
1956 struct nfs_removeargs *args = msg->rpc_argp;
1957 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 1958
e4eff1a6
TM		 1959 args->bitmask = server->attr_bitmask;
1960 res->server = server;
1da177e4 1961 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 1962}
1963
e4eff1a6 1964static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 1965{
e4eff1a6
TM		 1966 struct nfs_removeres *res = task->tk_msg.rpc_resp;
1967
1968 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1969 return 0;
1970 update_changeattr(dir, &res->cinfo);
1971 nfs_post_op_update_inode(dir, &res->dir_attr);
1972 return 1;
1da177e4
LT		 1973}
1974
1975static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1976 struct inode *new_dir, struct qstr *new_name)
1977{
6caf2c82 1978 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1979 struct nfs4_rename_arg arg = {
1980 .old_dir = NFS_FH(old_dir),
1981 .new_dir = NFS_FH(new_dir),
1982 .old_name = old_name,
1983 .new_name = new_name,
6caf2c82
TM		 1984 .bitmask = server->attr_bitmask,
1985 };
1986 struct nfs_fattr old_fattr, new_fattr;
1987 struct nfs4_rename_res res = {
1988 .server = server,
1989 .old_fattr = &old_fattr,
1990 .new_fattr = &new_fattr,
1da177e4 1991 };
1da177e4
LT		 1992 struct rpc_message msg = {
1993 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1994 .rpc_argp = &arg,
1995 .rpc_resp = &res,
1996 };
1997 int status;
1998
6caf2c82
TM		 1999 nfs_fattr_init(res.old_fattr);
2000 nfs_fattr_init(res.new_fattr);
2001 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2002
2003 if (!status) {
2004 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2005 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2006 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2007 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2008 }
2009 return status;
2010}
2011
2012static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2013 struct inode *new_dir, struct qstr *new_name)
2014{
2015 struct nfs4_exception exception = { };
2016 int err;
2017 do {
2018 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2019 _nfs4_proc_rename(old_dir, old_name,
2020 new_dir, new_name),
2021 &exception);
2022 } while (exception.retry);
2023 return err;
2024}
2025
2026static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2027{
91ba2eee 2028 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2029 struct nfs4_link_arg arg = {
2030 .fh = NFS_FH(inode),
2031 .dir_fh = NFS_FH(dir),
2032 .name = name,
91ba2eee
TM		 2033 .bitmask = server->attr_bitmask,
2034 };
2035 struct nfs_fattr fattr, dir_attr;
2036 struct nfs4_link_res res = {
2037 .server = server,
2038 .fattr = &fattr,
2039 .dir_attr = &dir_attr,
1da177e4 2040 };
1da177e4
LT		 2041 struct rpc_message msg = {
2042 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2043 .rpc_argp = &arg,
91ba2eee 2044 .rpc_resp = &res,
1da177e4
LT		 2045 };
2046 int status;
2047
91ba2eee
TM		 2048 nfs_fattr_init(res.fattr);
2049 nfs_fattr_init(res.dir_attr);
2050 status = rpc_call_sync(server->client, &msg, 0);
2051 if (!status) {
2052 update_changeattr(dir, &res.cinfo);
2053 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2054 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2055 }
1da177e4
LT		 2056
2057 return status;
2058}
2059
2060static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2061{
2062 struct nfs4_exception exception = { };
2063 int err;
2064 do {
2065 err = nfs4_handle_exception(NFS_SERVER(inode),
2066 _nfs4_proc_link(inode, dir, name),
2067 &exception);
2068 } while (exception.retry);
2069 return err;
2070}
2071
4f390c15 2072static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2073 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2074{
2075 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 2076 struct nfs_fh fhandle;
2077 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2078 struct nfs4_create_arg arg = {
2079 .dir_fh = NFS_FH(dir),
2080 .server = server,
4f390c15 2081 .name = &dentry->d_name,
1da177e4
LT		 2082 .attrs = sattr,
2083 .ftype = NF4LNK,
2084 .bitmask = server->attr_bitmask,
2085 };
2086 struct nfs4_create_res res = {
2087 .server = server,
4f390c15
CL		 2088 .fh = &fhandle,
2089 .fattr = &fattr,
56ae19f3 2090 .dir_fattr = &dir_fattr,
1da177e4
LT		 2091 };
2092 struct rpc_message msg = {
2093 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2094 .rpc_argp = &arg,
2095 .rpc_resp = &res,
2096 };
2097 int status;
2098
94a6d753 2099 if (len > NFS4_MAXPATHLEN)
1da177e4 2100 return -ENAMETOOLONG;
4f390c15 2101
94a6d753
CL		 2102 arg.u.symlink.pages = &page;
2103 arg.u.symlink.len = len;
4f390c15 2104 nfs_fattr_init(&fattr);
56ae19f3 2105 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2106
2107 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2108 if (!status) {
1da177e4 2109 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2110 nfs_post_op_update_inode(dir, res.dir_fattr);
2111 status = nfs_instantiate(dentry, &fhandle, &fattr);
2112 }
1da177e4
LT		 2113 return status;
2114}
2115
4f390c15 2116static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2117 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2118{
2119 struct nfs4_exception exception = { };
2120 int err;
2121 do {
2122 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2123 _nfs4_proc_symlink(dir, dentry, page,
2124 len, sattr),
1da177e4
LT		 2125 &exception);
2126 } while (exception.retry);
2127 return err;
2128}
2129
2130static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2131 struct iattr *sattr)
2132{
2133 struct nfs_server *server = NFS_SERVER(dir);
2134 struct nfs_fh fhandle;
56ae19f3 2135 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2136 struct nfs4_create_arg arg = {
2137 .dir_fh = NFS_FH(dir),
2138 .server = server,
2139 .name = &dentry->d_name,
2140 .attrs = sattr,
2141 .ftype = NF4DIR,
2142 .bitmask = server->attr_bitmask,
2143 };
2144 struct nfs4_create_res res = {
2145 .server = server,
2146 .fh = &fhandle,
2147 .fattr = &fattr,
56ae19f3 2148 .dir_fattr = &dir_fattr,
1da177e4
LT		 2149 };
2150 struct rpc_message msg = {
2151 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2152 .rpc_argp = &arg,
2153 .rpc_resp = &res,
2154 };
2155 int status;
2156
0e574af1 2157 nfs_fattr_init(&fattr);
56ae19f3 2158 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2159
2160 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2161 if (!status) {
2162 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2163 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2164 status = nfs_instantiate(dentry, &fhandle, &fattr);
2165 }
2166 return status;
2167}
2168
2169static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2170 struct iattr *sattr)
2171{
2172 struct nfs4_exception exception = { };
2173 int err;
2174 do {
2175 err = nfs4_handle_exception(NFS_SERVER(dir),
2176 _nfs4_proc_mkdir(dir, dentry, sattr),
2177 &exception);
2178 } while (exception.retry);
2179 return err;
2180}
2181
2182static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2183 u64 cookie, struct page *page, unsigned int count, int plus)
2184{
2185 struct inode *dir = dentry->d_inode;
2186 struct nfs4_readdir_arg args = {
2187 .fh = NFS_FH(dir),
2188 .pages = &page,
2189 .pgbase = 0,
2190 .count = count,
2191 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2192 };
2193 struct nfs4_readdir_res res;
2194 struct rpc_message msg = {
2195 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2196 .rpc_argp = &args,
2197 .rpc_resp = &res,
2198 .rpc_cred = cred,
2199 };
2200 int status;
2201
eadf4598
TM		 2202 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2203 dentry->d_parent->d_name.name,
2204 dentry->d_name.name,
2205 (unsigned long long)cookie);
1da177e4
LT		 2206 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2207 res.pgbase = args.pgbase;
2208 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2209 if (status == 0)
2210 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2211
2212 nfs_invalidate_atime(dir);
2213
eadf4598 2214 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2215 return status;
2216}
2217
2218static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2219 u64 cookie, struct page *page, unsigned int count, int plus)
2220{
2221 struct nfs4_exception exception = { };
2222 int err;
2223 do {
2224 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2225 _nfs4_proc_readdir(dentry, cred, cookie,
2226 page, count, plus),
2227 &exception);
2228 } while (exception.retry);
2229 return err;
2230}
2231
2232static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2233 struct iattr *sattr, dev_t rdev)
2234{
2235 struct nfs_server *server = NFS_SERVER(dir);
2236 struct nfs_fh fh;
56ae19f3 2237 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2238 struct nfs4_create_arg arg = {
2239 .dir_fh = NFS_FH(dir),
2240 .server = server,
2241 .name = &dentry->d_name,
2242 .attrs = sattr,
2243 .bitmask = server->attr_bitmask,
2244 };
2245 struct nfs4_create_res res = {
2246 .server = server,
2247 .fh = &fh,
2248 .fattr = &fattr,
56ae19f3 2249 .dir_fattr = &dir_fattr,
1da177e4
LT		 2250 };
2251 struct rpc_message msg = {
2252 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2253 .rpc_argp = &arg,
2254 .rpc_resp = &res,
2255 };
2256 int status;
2257 int mode = sattr->ia_mode;
2258
0e574af1 2259 nfs_fattr_init(&fattr);
56ae19f3 2260 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2261
2262 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2263 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2264 if (S_ISFIFO(mode))
2265 arg.ftype = NF4FIFO;
2266 else if (S_ISBLK(mode)) {
2267 arg.ftype = NF4BLK;
2268 arg.u.device.specdata1 = MAJOR(rdev);
2269 arg.u.device.specdata2 = MINOR(rdev);
2270 }
2271 else if (S_ISCHR(mode)) {
2272 arg.ftype = NF4CHR;
2273 arg.u.device.specdata1 = MAJOR(rdev);
2274 arg.u.device.specdata2 = MINOR(rdev);
2275 }
2276 else
2277 arg.ftype = NF4SOCK;
2278
2279 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2280 if (status == 0) {
2281 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2282 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2283 status = nfs_instantiate(dentry, &fh, &fattr);
2284 }
2285 return status;
2286}
2287
2288static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2289 struct iattr *sattr, dev_t rdev)
2290{
2291 struct nfs4_exception exception = { };
2292 int err;
2293 do {
2294 err = nfs4_handle_exception(NFS_SERVER(dir),
2295 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2296 &exception);
2297 } while (exception.retry);
2298 return err;
2299}
2300
2301static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2302 struct nfs_fsstat *fsstat)
2303{
2304 struct nfs4_statfs_arg args = {
2305 .fh = fhandle,
2306 .bitmask = server->attr_bitmask,
2307 };
2308 struct rpc_message msg = {
2309 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2310 .rpc_argp = &args,
2311 .rpc_resp = fsstat,
2312 };
2313
0e574af1 2314 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2315 return rpc_call_sync(server->client, &msg, 0);
2316}
2317
2318static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2319{
2320 struct nfs4_exception exception = { };
2321 int err;
2322 do {
2323 err = nfs4_handle_exception(server,
2324 _nfs4_proc_statfs(server, fhandle, fsstat),
2325 &exception);
2326 } while (exception.retry);
2327 return err;
2328}
2329
2330static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2331 struct nfs_fsinfo *fsinfo)
2332{
2333 struct nfs4_fsinfo_arg args = {
2334 .fh = fhandle,
2335 .bitmask = server->attr_bitmask,
2336 };
2337 struct rpc_message msg = {
2338 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2339 .rpc_argp = &args,
2340 .rpc_resp = fsinfo,
2341 };
2342
2343 return rpc_call_sync(server->client, &msg, 0);
2344}
2345
2346static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2347{
2348 struct nfs4_exception exception = { };
2349 int err;
2350
2351 do {
2352 err = nfs4_handle_exception(server,
2353 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2354 &exception);
2355 } while (exception.retry);
2356 return err;
2357}
2358
2359static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2360{
0e574af1 2361 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2362 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2363}
2364
2365static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2366 struct nfs_pathconf *pathconf)
2367{
2368 struct nfs4_pathconf_arg args = {
2369 .fh = fhandle,
2370 .bitmask = server->attr_bitmask,
2371 };
2372 struct rpc_message msg = {
2373 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2374 .rpc_argp = &args,
2375 .rpc_resp = pathconf,
2376 };
2377
2378 /* None of the pathconf attributes are mandatory to implement */
2379 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2380 memset(pathconf, 0, sizeof(*pathconf));
2381 return 0;
2382 }
2383
0e574af1 2384 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2385 return rpc_call_sync(server->client, &msg, 0);
2386}
2387
2388static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2389 struct nfs_pathconf *pathconf)
2390{
2391 struct nfs4_exception exception = { };
2392 int err;
2393
2394 do {
2395 err = nfs4_handle_exception(server,
2396 _nfs4_proc_pathconf(server, fhandle, pathconf),
2397 &exception);
2398 } while (exception.retry);
2399 return err;
2400}
2401
ec06c096 2402static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2403{
ec06c096 2404 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2405
ec06c096 2406 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2407 rpc_restart_call(task);
ec06c096 2408 return -EAGAIN;
1da177e4 2409 }
8850df99
TM		 2410
2411 nfs_invalidate_atime(data->inode);
1da177e4 2412 if (task->tk_status > 0)
ec06c096
TM		 2413 renew_lease(server, data->timestamp);
2414 return 0;
1da177e4
LT		 2415}
2416
ec06c096 2417static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2418{
1da177e4
LT		 2419 struct rpc_message msg = {
2420 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2421 .rpc_argp = &data->args,
2422 .rpc_resp = &data->res,
2423 .rpc_cred = data->cred,
2424 };
1da177e4
LT		 2425
2426 data->timestamp = jiffies;
2427
ec06c096 2428 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2429}
2430
788e7a89 2431static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2432{
1da177e4
LT		 2433 struct inode *inode = data->inode;
2434
2435 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2436 rpc_restart_call(task);
788e7a89 2437 return -EAGAIN;
1da177e4 2438 }
4f9838c7 2439 if (task->tk_status >= 0) {
1da177e4 2440 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2441 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2442 }
788e7a89 2443 return 0;
1da177e4
LT		 2444}
2445
788e7a89 2446static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2447{
1da177e4
LT		 2448 struct rpc_message msg = {
2449 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2450 .rpc_argp = &data->args,
2451 .rpc_resp = &data->res,
2452 .rpc_cred = data->cred,
2453 };
2454 struct inode *inode = data->inode;
4f9838c7 2455 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2456 int stable;
1da177e4
LT		 2457
2458 if (how & FLUSH_STABLE) {
2459 if (!NFS_I(inode)->ncommit)
2460 stable = NFS_FILE_SYNC;
2461 else
2462 stable = NFS_DATA_SYNC;
2463 } else
2464 stable = NFS_UNSTABLE;
2465 data->args.stable = stable;
4f9838c7
TM		 2466 data->args.bitmask = server->attr_bitmask;
2467 data->res.server = server;
1da177e4
LT		 2468
2469 data->timestamp = jiffies;
2470
1da177e4 2471 /* Finalize the task. */
788e7a89 2472 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2473}
2474
788e7a89 2475static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2476{
1da177e4
LT		 2477 struct inode *inode = data->inode;
2478
2479 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2480 rpc_restart_call(task);
788e7a89 2481 return -EAGAIN;
1da177e4 2482 }
9e08a3c5 2483 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2484 return 0;
1da177e4
LT		 2485}
2486
788e7a89 2487static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2488{
1da177e4
LT		 2489 struct rpc_message msg = {
2490 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2491 .rpc_argp = &data->args,
2492 .rpc_resp = &data->res,
2493 .rpc_cred = data->cred,
2494 };
788e7a89 2495 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2496
4f9838c7
TM		 2497 data->args.bitmask = server->attr_bitmask;
2498 data->res.server = server;
2499
788e7a89 2500 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2501}
2502
2503/*
2504 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2505 * standalone procedure for queueing an asynchronous RENEW.
2506 */
963d8fe5 2507static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2508{
adfa6f98 2509 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2510 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2511
2512 if (task->tk_status < 0) {
2513 switch (task->tk_status) {
2514 case -NFS4ERR_STALE_CLIENTID:
2515 case -NFS4ERR_EXPIRED:
2516 case -NFS4ERR_CB_PATH_DOWN:
2517 nfs4_schedule_state_recovery(clp);
2518 }
2519 return;
2520 }
2521 spin_lock(&clp->cl_lock);
2522 if (time_before(clp->cl_last_renewal,timestamp))
2523 clp->cl_last_renewal = timestamp;
2524 spin_unlock(&clp->cl_lock);
2525}
2526
963d8fe5
TM		 2527static const struct rpc_call_ops nfs4_renew_ops = {
2528 .rpc_call_done = nfs4_renew_done,
2529};
2530
adfa6f98 2531int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2532{
2533 struct rpc_message msg = {
2534 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2535 .rpc_argp = clp,
b4454fe1 2536 .rpc_cred = cred,
1da177e4
LT		 2537 };
2538
2539 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2540 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2541}
2542
adfa6f98 2543int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2544{
2545 struct rpc_message msg = {
2546 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2547 .rpc_argp = clp,
b4454fe1 2548 .rpc_cred = cred,
1da177e4
LT		 2549 };
2550 unsigned long now = jiffies;
2551 int status;
2552
2553 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2554 if (status < 0)
2555 return status;
2556 spin_lock(&clp->cl_lock);
2557 if (time_before(clp->cl_last_renewal,now))
2558 clp->cl_last_renewal = now;
2559 spin_unlock(&clp->cl_lock);
2560 return 0;
2561}
2562
aa1870af
BF		 2563static inline int nfs4_server_supports_acls(struct nfs_server *server)
2564{
2565 return (server->caps & NFS_CAP_ACLS)
2566 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2567 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2568}
2569
2570/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2571 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2572 * the stack.
2573 */
2574#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2575
2576static void buf_to_pages(const void *buf, size_t buflen,
2577 struct page **pages, unsigned int *pgbase)
2578{
2579 const void *p = buf;
2580
2581 *pgbase = offset_in_page(buf);
2582 p -= *pgbase;
2583 while (p < buf + buflen) {
2584 *(pages++) = virt_to_page(p);
2585 p += PAGE_CACHE_SIZE;
2586 }
2587}
2588
e50a1c2e
BF		 2589struct nfs4_cached_acl {
2590 int cached;
2591 size_t len;
3e9d4154 2592 char data[0];
e50a1c2e
BF		 2593};
2594
2595static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2596{
2597 struct nfs_inode *nfsi = NFS_I(inode);
2598
2599 spin_lock(&inode->i_lock);
2600 kfree(nfsi->nfs4_acl);
2601 nfsi->nfs4_acl = acl;
2602 spin_unlock(&inode->i_lock);
2603}
2604
2605static void nfs4_zap_acl_attr(struct inode *inode)
2606{
2607 nfs4_set_cached_acl(inode, NULL);
2608}
2609
2610static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2611{
2612 struct nfs_inode *nfsi = NFS_I(inode);
2613 struct nfs4_cached_acl *acl;
2614 int ret = -ENOENT;
2615
2616 spin_lock(&inode->i_lock);
2617 acl = nfsi->nfs4_acl;
2618 if (acl == NULL)
2619 goto out;
2620 if (buf == NULL) /* user is just asking for length */
2621 goto out_len;
2622 if (acl->cached == 0)
2623 goto out;
2624 ret = -ERANGE; /* see getxattr(2) man page */
2625 if (acl->len > buflen)
2626 goto out;
2627 memcpy(buf, acl->data, acl->len);
2628out_len:
2629 ret = acl->len;
2630out:
2631 spin_unlock(&inode->i_lock);
2632 return ret;
2633}
2634
2635static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2636{
2637 struct nfs4_cached_acl *acl;
2638
2639 if (buf && acl_len <= PAGE_SIZE) {
2640 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2641 if (acl == NULL)
2642 goto out;
2643 acl->cached = 1;
2644 memcpy(acl->data, buf, acl_len);
2645 } else {
2646 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2647 if (acl == NULL)
2648 goto out;
2649 acl->cached = 0;
2650 }
2651 acl->len = acl_len;
2652out:
2653 nfs4_set_cached_acl(inode, acl);
2654}
2655
16b4289c 2656static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2657{
aa1870af
BF		 2658 struct page *pages[NFS4ACL_MAXPAGES];
2659 struct nfs_getaclargs args = {
2660 .fh = NFS_FH(inode),
2661 .acl_pages = pages,
2662 .acl_len = buflen,
2663 };
2664 size_t resp_len = buflen;
e50a1c2e 2665 void *resp_buf;
aa1870af
BF		 2666 struct rpc_message msg = {
2667 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2668 .rpc_argp = &args,
2669 .rpc_resp = &resp_len,
2670 };
e50a1c2e 2671 struct page *localpage = NULL;
aa1870af
BF		 2672 int ret;
2673
e50a1c2e
BF		 2674 if (buflen < PAGE_SIZE) {
2675 /* As long as we're doing a round trip to the server anyway,
2676 * let's be prepared for a page of acl data. */
2677 localpage = alloc_page(GFP_KERNEL);
2678 resp_buf = page_address(localpage);
2679 if (localpage == NULL)
2680 return -ENOMEM;
2681 args.acl_pages[0] = localpage;
2682 args.acl_pgbase = 0;
1d95db8e 2683 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2684 } else {
2685 resp_buf = buf;
2686 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2687 }
aa1870af 2688 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2689 if (ret)
2690 goto out_free;
2691 if (resp_len > args.acl_len)
2692 nfs4_write_cached_acl(inode, NULL, resp_len);
2693 else
2694 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2695 if (buf) {
2696 ret = -ERANGE;
2697 if (resp_len > buflen)
2698 goto out_free;
2699 if (localpage)
2700 memcpy(buf, resp_buf, resp_len);
2701 }
2702 ret = resp_len;
2703out_free:
2704 if (localpage)
2705 __free_page(localpage);
aa1870af
BF		 2706 return ret;
2707}
2708
16b4289c
TM		 2709static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2710{
2711 struct nfs4_exception exception = { };
2712 ssize_t ret;
2713 do {
2714 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2715 if (ret >= 0)
2716 break;
2717 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2718 } while (exception.retry);
2719 return ret;
2720}
2721
e50a1c2e
BF		 2722static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2723{
2724 struct nfs_server *server = NFS_SERVER(inode);
2725 int ret;
2726
2727 if (!nfs4_server_supports_acls(server))
2728 return -EOPNOTSUPP;
2729 ret = nfs_revalidate_inode(server, inode);
2730 if (ret < 0)
2731 return ret;
2732 ret = nfs4_read_cached_acl(inode, buf, buflen);
2733 if (ret != -ENOENT)
2734 return ret;
2735 return nfs4_get_acl_uncached(inode, buf, buflen);
2736}
2737
16b4289c 2738static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2739{
2740 struct nfs_server *server = NFS_SERVER(inode);
2741 struct page *pages[NFS4ACL_MAXPAGES];
2742 struct nfs_setaclargs arg = {
2743 .fh = NFS_FH(inode),
2744 .acl_pages = pages,
2745 .acl_len = buflen,
2746 };
2747 struct rpc_message msg = {
2748 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2749 .rpc_argp = &arg,
2750 .rpc_resp = NULL,
2751 };
2752 int ret;
2753
2754 if (!nfs4_server_supports_acls(server))
2755 return -EOPNOTSUPP;
642ac549 2756 nfs_inode_return_delegation(inode);
4b580ee3 2757 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2758 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
08efa202 2759 nfs_zap_caches(inode);
4b580ee3
BF		 2760 return ret;
2761}
2762
16b4289c
TM		 2763static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2764{
2765 struct nfs4_exception exception = { };
2766 int err;
2767 do {
2768 err = nfs4_handle_exception(NFS_SERVER(inode),
2769 __nfs4_proc_set_acl(inode, buf, buflen),
2770 &exception);
2771 } while (exception.retry);
2772 return err;
2773}
2774
1da177e4 2775static int
faf5f49c 2776nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2777{
7539bbab 2778 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2779
2780 if (!clp || task->tk_status >= 0)
2781 return 0;
2782 switch(task->tk_status) {
2783 case -NFS4ERR_STALE_CLIENTID:
2784 case -NFS4ERR_STALE_STATEID:
2785 case -NFS4ERR_EXPIRED:
2786 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2787 nfs4_schedule_state_recovery(clp);
433fbe4c 2788 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2789 rpc_wake_up_task(task);
2790 task->tk_status = 0;
2791 return -EAGAIN;
1da177e4 2792 case -NFS4ERR_DELAY:
006ea73e
CL		 2793 nfs_inc_server_stats((struct nfs_server *) server,
2794 NFSIOS_DELAY);
2795 case -NFS4ERR_GRACE:
1da177e4
LT		 2796 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2797 task->tk_status = 0;
2798 return -EAGAIN;
2799 case -NFS4ERR_OLD_STATEID:
2800 task->tk_status = 0;
2801 return -EAGAIN;
2802 }
2803 task->tk_status = nfs4_map_errors(task->tk_status);
2804 return 0;
2805}
2806
433fbe4c
TM		 2807static int nfs4_wait_bit_interruptible(void *word)
2808{
2809 if (signal_pending(current))
2810 return -ERESTARTSYS;
2811 schedule();
2812 return 0;
2813}
2814
adfa6f98 2815static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2816{
1da177e4 2817 sigset_t oldset;
433fbe4c 2818 int res;
1da177e4
LT		 2819
2820 might_sleep();
2821
e148582e
TM		 2822 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2823
1da177e4 2824 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2825 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2826 nfs4_wait_bit_interruptible,
2827 TASK_INTERRUPTIBLE);
1da177e4 2828 rpc_clnt_sigunmask(clnt, &oldset);
e148582e
TM		 2829
2830 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2831 return res;
2832}
2833
2834static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2835{
2836 sigset_t oldset;
2837 int res = 0;
2838
2839 might_sleep();
2840
2841 if (*timeout <= 0)
2842 *timeout = NFS4_POLL_RETRY_MIN;
2843 if (*timeout > NFS4_POLL_RETRY_MAX)
2844 *timeout = NFS4_POLL_RETRY_MAX;
2845 rpc_clnt_sigmask(clnt, &oldset);
2846 if (clnt->cl_intr) {
041e0e3b 2847 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2848 if (signalled())
2849 res = -ERESTARTSYS;
041e0e3b
NA		 2850 } else
2851 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2852 rpc_clnt_sigunmask(clnt, &oldset);
2853 *timeout <<= 1;
2854 return res;
2855}
2856
2857/* This is the error handling routine for processes that are allowed
2858 * to sleep.
2859 */
10afec90 2860static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2861{
7539bbab 2862 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2863 int ret = errorcode;
2864
2865 exception->retry = 0;
2866 switch(errorcode) {
2867 case 0:
2868 return 0;
2869 case -NFS4ERR_STALE_CLIENTID:
2870 case -NFS4ERR_STALE_STATEID:
2871 case -NFS4ERR_EXPIRED:
433fbe4c 2872 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2873 ret = nfs4_wait_clnt_recover(server->client, clp);
2874 if (ret == 0)
2875 exception->retry = 1;
2876 break;
c514983d 2877 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2878 case -NFS4ERR_GRACE:
2879 case -NFS4ERR_DELAY:
2880 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2881 if (ret != 0)
2882 break;
1da177e4 2883 case -NFS4ERR_OLD_STATEID:
2c56617d 2884 exception->retry = 1;
1da177e4
LT		 2885 }
2886 /* We failed to handle the error */
2887 return nfs4_map_errors(ret);
2888}
2889
adfa6f98 2890int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2891{
2892 nfs4_verifier sc_verifier;
2893 struct nfs4_setclientid setclientid = {
2894 .sc_verifier = &sc_verifier,
2895 .sc_prog = program,
2896 };
2897 struct rpc_message msg = {
2898 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2899 .rpc_argp = &setclientid,
2900 .rpc_resp = clp,
286d7d6a 2901 .rpc_cred = cred,
1da177e4 2902 };
bc4785cd 2903 __be32 *p;
1da177e4
LT		 2904 int loop = 0;
2905 int status;
2906
bc4785cd 2907 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2908 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2909 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2910
2911 for(;;) {
2912 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2913 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2914 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2915 cred->cr_ops->cr_name,
1da177e4
LT		 2916 clp->cl_id_uniquifier);
2917 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2918 sizeof(setclientid.sc_netid), "tcp");
2919 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2920 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2921 clp->cl_ipaddr, port >> 8, port & 255);
2922
2923 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2924 if (status != -NFS4ERR_CLID_INUSE)
2925 break;
2926 if (signalled())
2927 break;
2928 if (loop++ & 1)
2929 ssleep(clp->cl_lease_time + 1);
2930 else
2931 if (++clp->cl_id_uniquifier == 0)
2932 break;
2933 }
2934 return status;
2935}
2936
adfa6f98 2937static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2938{
2939 struct nfs_fsinfo fsinfo;
2940 struct rpc_message msg = {
2941 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2942 .rpc_argp = clp,
2943 .rpc_resp = &fsinfo,
286d7d6a 2944 .rpc_cred = cred,
1da177e4
LT		 2945 };
2946 unsigned long now;
2947 int status;
2948
2949 now = jiffies;
2950 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2951 if (status == 0) {
2952 spin_lock(&clp->cl_lock);
2953 clp->cl_lease_time = fsinfo.lease_time * HZ;
2954 clp->cl_last_renewal = now;
58d9714a 2955 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2956 spin_unlock(&clp->cl_lock);
2957 }
2958 return status;
2959}
2960
adfa6f98 2961int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2962{
2963 long timeout;
2964 int err;
2965 do {
2966 err = _nfs4_proc_setclientid_confirm(clp, cred);
2967 switch (err) {
2968 case 0:
2969 return err;
2970 case -NFS4ERR_RESOURCE:
2971 /* The IBM lawyers misread another document! */
2972 case -NFS4ERR_DELAY:
2973 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2974 }
2975 } while (err == 0);
2976 return err;
2977}
2978
fe650407
TM		 2979struct nfs4_delegreturndata {
2980 struct nfs4_delegreturnargs args;
fa178f29 2981 struct nfs4_delegreturnres res;
fe650407
TM		 2982 struct nfs_fh fh;
2983 nfs4_stateid stateid;
2984 struct rpc_cred *cred;
26e976a8 2985 unsigned long timestamp;
fa178f29 2986 struct nfs_fattr fattr;
fe650407
TM		 2987 int rpc_status;
2988};
2989
2990static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 2991{
fe650407 2992 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 2993 struct rpc_message msg = {
2994 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 2995 .rpc_argp = &data->args,
fa178f29 2996 .rpc_resp = &data->res,
fe650407 2997 .rpc_cred = data->cred,
1da177e4 2998 };
fa178f29 2999 nfs_fattr_init(data->res.fattr);
fe650407
TM		 3000 rpc_call_setup(task, &msg, 0);
3001}
1da177e4 3002
fe650407
TM		 3003static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3004{
3005 struct nfs4_delegreturndata *data = calldata;
3006 data->rpc_status = task->tk_status;
26e976a8 3007 if (data->rpc_status == 0)
fa178f29 3008 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 3009}
3010
3011static void nfs4_delegreturn_release(void *calldata)
3012{
3013 struct nfs4_delegreturndata *data = calldata;
3014
3015 put_rpccred(data->cred);
3016 kfree(calldata);
3017}
3018
c8d149f3 3019static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 3020 .rpc_call_prepare = nfs4_delegreturn_prepare,
3021 .rpc_call_done = nfs4_delegreturn_done,
3022 .rpc_release = nfs4_delegreturn_release,
3023};
3024
3025static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3026{
3027 struct nfs4_delegreturndata *data;
fa178f29 3028 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 3029 struct rpc_task *task;
3030 int status;
3031
3032 data = kmalloc(sizeof(*data), GFP_KERNEL);
3033 if (data == NULL)
3034 return -ENOMEM;
3035 data->args.fhandle = &data->fh;
3036 data->args.stateid = &data->stateid;
fa178f29 3037 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3038 nfs_copy_fh(&data->fh, NFS_FH(inode));
3039 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3040 data->res.fattr = &data->fattr;
3041 data->res.server = server;
fe650407 3042 data->cred = get_rpccred(cred);
26e976a8 3043 data->timestamp = jiffies;
fe650407
TM		 3044 data->rpc_status = 0;
3045
3046 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 3047 if (IS_ERR(task))
fe650407 3048 return PTR_ERR(task);
fe650407 3049 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 3050 if (status == 0) {
fe650407 3051 status = data->rpc_status;
fa178f29 3052 if (status == 0)
9e08a3c5 3053 nfs_refresh_inode(inode, &data->fattr);
fa178f29 3054 }
e6b3c4db 3055 rpc_put_task(task);
fe650407 3056 return status;
1da177e4
LT		 3057}
3058
3059int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3060{
3061 struct nfs_server *server = NFS_SERVER(inode);
3062 struct nfs4_exception exception = { };
3063 int err;
3064 do {
3065 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3066 switch (err) {
3067 case -NFS4ERR_STALE_STATEID:
3068 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3069 case 0:
3070 return 0;
3071 }
3072 err = nfs4_handle_exception(server, err, &exception);
3073 } while (exception.retry);
3074 return err;
3075}
3076
3077#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3078#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3079
3080/*
3081 * sleep, with exponential backoff, and retry the LOCK operation.
3082 */
3083static unsigned long
3084nfs4_set_lock_task_retry(unsigned long timeout)
3085{
041e0e3b 3086 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3087 timeout <<= 1;
3088 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3089 return NFS4_LOCK_MAXTIMEOUT;
3090 return timeout;
3091}
3092
1da177e4
LT		 3093static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3094{
3095 struct inode *inode = state->inode;
3096 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3097 struct nfs_client *clp = server->nfs_client;
911d1aaf 3098 struct nfs_lockt_args arg = {
1da177e4 3099 .fh = NFS_FH(inode),
911d1aaf 3100 .fl = request,
1da177e4 3101 };
911d1aaf
TM		 3102 struct nfs_lockt_res res = {
3103 .denied = request,
1da177e4
LT		 3104 };
3105 struct rpc_message msg = {
3106 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3107 .rpc_argp = &arg,
3108 .rpc_resp = &res,
3109 .rpc_cred = state->owner->so_cred,
3110 };
1da177e4
LT		 3111 struct nfs4_lock_state *lsp;
3112 int status;
3113
3114 down_read(&clp->cl_sem);
911d1aaf 3115 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3116 status = nfs4_set_lock_state(state, request);
3117 if (status != 0)
3118 goto out;
3119 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3120 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3121 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3122 switch (status) {
3123 case 0:
3124 request->fl_type = F_UNLCK;
3125 break;
3126 case -NFS4ERR_DENIED:
3127 status = 0;
1da177e4 3128 }
70cc6487 3129 request->fl_ops->fl_release_private(request);
8d0a8a9d 3130out:
1da177e4
LT		 3131 up_read(&clp->cl_sem);
3132 return status;
3133}
3134
3135static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3136{
3137 struct nfs4_exception exception = { };
3138 int err;
3139
3140 do {
3141 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3142 _nfs4_proc_getlk(state, cmd, request),
3143 &exception);
3144 } while (exception.retry);
3145 return err;
3146}
3147
3148static int do_vfs_lock(struct file *file, struct file_lock *fl)
3149{
3150 int res = 0;
3151 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3152 case FL_POSIX:
3153 res = posix_lock_file_wait(file, fl);
3154 break;
3155 case FL_FLOCK:
3156 res = flock_lock_file_wait(file, fl);
3157 break;
3158 default:
3159 BUG();
3160 }
1da177e4
LT		 3161 return res;
3162}
3163
faf5f49c 3164struct nfs4_unlockdata {
911d1aaf
TM		 3165 struct nfs_locku_args arg;
3166 struct nfs_locku_res res;
faf5f49c
TM		 3167 struct nfs4_lock_state *lsp;
3168 struct nfs_open_context *ctx;
911d1aaf
TM		 3169 struct file_lock fl;
3170 const struct nfs_server *server;
26e976a8 3171 unsigned long timestamp;
faf5f49c
TM		 3172};
3173
911d1aaf
TM		 3174static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3175 struct nfs_open_context *ctx,
3176 struct nfs4_lock_state *lsp,
3177 struct nfs_seqid *seqid)
3178{
3179 struct nfs4_unlockdata *p;
3180 struct inode *inode = lsp->ls_state->inode;
3181
3182 p = kmalloc(sizeof(*p), GFP_KERNEL);
3183 if (p == NULL)
3184 return NULL;
3185 p->arg.fh = NFS_FH(inode);
3186 p->arg.fl = &p->fl;
3187 p->arg.seqid = seqid;
3188 p->arg.stateid = &lsp->ls_stateid;
3189 p->lsp = lsp;
3190 atomic_inc(&lsp->ls_count);
3191 /* Ensure we don't close file until we're done freeing locks! */
3192 p->ctx = get_nfs_open_context(ctx);
3193 memcpy(&p->fl, fl, sizeof(p->fl));
3194 p->server = NFS_SERVER(inode);
3195 return p;
3196}
3197
06f814a3 3198static void nfs4_locku_release_calldata(void *data)
faf5f49c 3199{
963d8fe5 3200 struct nfs4_unlockdata *calldata = data;
911d1aaf 3201 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3202 nfs4_put_lock_state(calldata->lsp);
3203 put_nfs_open_context(calldata->ctx);
3204 kfree(calldata);
faf5f49c
TM		 3205}
3206
963d8fe5 3207static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3208{
963d8fe5 3209 struct nfs4_unlockdata *calldata = data;
faf5f49c 3210
06f814a3
TM		 3211 if (RPC_ASSASSINATED(task))
3212 return;
911d1aaf 3213 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3214 switch (task->tk_status) {
3215 case 0:
3216 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3217 calldata->res.stateid.data,
faf5f49c 3218 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3219 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3220 break;
3221 case -NFS4ERR_STALE_STATEID:
3222 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3223 break;
3224 default:
a6a352e9 3225 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3226 rpc_restart_call(task);
faf5f49c 3227 }
faf5f49c
TM		 3228}
3229
4ce70ada 3230static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3231{
4ce70ada 3232 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3233 struct rpc_message msg = {
3234 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3235 .rpc_argp = &calldata->arg,
3236 .rpc_resp = &calldata->res,
3237 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3238 };
faf5f49c 3239
911d1aaf 3240 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3241 return;
3242 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3243 /* Note: exit _without_ running nfs4_locku_done */
3244 task->tk_action = NULL;
faf5f49c
TM		 3245 return;
3246 }
26e976a8 3247 calldata->timestamp = jiffies;
faf5f49c
TM		 3248 rpc_call_setup(task, &msg, 0);
3249}
3250
963d8fe5 3251static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3252 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3253 .rpc_call_done = nfs4_locku_done,
06f814a3 3254 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3255};
3256
a5d16a4d
TM		 3257static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3258 struct nfs_open_context *ctx,
3259 struct nfs4_lock_state *lsp,
3260 struct nfs_seqid *seqid)
3261{
3262 struct nfs4_unlockdata *data;
a5d16a4d 3263
137d6aca
FF		 3264 /* Ensure this is an unlock - when canceling a lock, the
3265 * canceled lock is passed in, and it won't be an unlock.
3266 */
3267 fl->fl_type = F_UNLCK;
3268
a5d16a4d
TM		 3269 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3270 if (data == NULL) {
3271 nfs_free_seqid(seqid);
3272 return ERR_PTR(-ENOMEM);
3273 }
3274
7a1218a2 3275 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3276}
3277
faf5f49c
TM		 3278static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3279{
911d1aaf 3280 struct nfs_seqid *seqid;
1da177e4 3281 struct nfs4_lock_state *lsp;
06f814a3
TM		 3282 struct rpc_task *task;
3283 int status = 0;
faf5f49c 3284
8d0a8a9d 3285 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3286 /* Unlock _before_ we do the RPC call */
3287 request->fl_flags |= FL_EXISTS;
3288 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3289 goto out;
8d0a8a9d 3290 if (status != 0)
9b073574
TM		 3291 goto out;
3292 /* Is this a delegated lock? */
3293 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3294 goto out;
8d0a8a9d 3295 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3296 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3297 status = -ENOMEM;
911d1aaf 3298 if (seqid == NULL)
9b073574 3299 goto out;
cd3758e3 3300 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3301 status = PTR_ERR(task);
3302 if (IS_ERR(task))
9b073574 3303 goto out;
a5d16a4d 3304 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3305 rpc_put_task(task);
9b073574 3306out:
1da177e4
LT		 3307 return status;
3308}
3309
a5d16a4d
TM		 3310struct nfs4_lockdata {
3311 struct nfs_lock_args arg;
3312 struct nfs_lock_res res;
3313 struct nfs4_lock_state *lsp;
3314 struct nfs_open_context *ctx;
3315 struct file_lock fl;
26e976a8 3316 unsigned long timestamp;
a5d16a4d
TM		 3317 int rpc_status;
3318 int cancelled;
3319};
3320
3321static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3322 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3323{
a5d16a4d
TM		 3324 struct nfs4_lockdata *p;
3325 struct inode *inode = lsp->ls_state->inode;
1da177e4 3326 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3327
3328 p = kzalloc(sizeof(*p), GFP_KERNEL);
3329 if (p == NULL)
3330 return NULL;
3331
3332 p->arg.fh = NFS_FH(inode);
3333 p->arg.fl = &p->fl;
e6e21970
TM		 3334 if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
3335 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3336 if (p->arg.open_seqid == NULL)
3337 goto out_free;
3338
3339 }
a5d16a4d
TM		 3340 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3341 if (p->arg.lock_seqid == NULL)
3342 goto out_free;
3343 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3344 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3345 p->arg.lock_owner.id = lsp->ls_id.id;
a5d16a4d
TM		 3346 p->lsp = lsp;
3347 atomic_inc(&lsp->ls_count);
3348 p->ctx = get_nfs_open_context(ctx);
3349 memcpy(&p->fl, fl, sizeof(p->fl));
3350 return p;
3351out_free:
e6e21970
TM		 3352 if (p->arg.open_seqid != NULL)
3353 nfs_free_seqid(p->arg.open_seqid);
a5d16a4d
TM		 3354 kfree(p);
3355 return NULL;
3356}
3357
3358static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3359{
3360 struct nfs4_lockdata *data = calldata;
3361 struct nfs4_state *state = data->lsp->ls_state;
3362 struct nfs4_state_owner *sp = state->owner;
1da177e4 3363 struct rpc_message msg = {
a5d16a4d
TM		 3364 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3365 .rpc_argp = &data->arg,
3366 .rpc_resp = &data->res,
3367 .rpc_cred = sp->so_cred,
1da177e4 3368 };
06735b34 3369
a5d16a4d
TM		 3370 dprintk("%s: begin!\n", __FUNCTION__);
3371 /* Do we need to do an open_to_lock_owner? */
3372 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
e6e21970
TM		 3373 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3374 return;
a5d16a4d
TM		 3375 data->arg.open_stateid = &state->stateid;
3376 data->arg.new_lock_owner = 1;
e6e21970
TM		 3377 /* Retest in case we raced... */
3378 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED))
3379 goto do_rpc;
a5d16a4d 3380 }
e6e21970
TM		 3381 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3382 return;
3383 data->arg.new_lock_owner = 0;
3384do_rpc:
26e976a8 3385 data->timestamp = jiffies;
a5d16a4d 3386 rpc_call_setup(task, &msg, 0);
a5d16a4d
TM		 3387 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3388}
3389
3390static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3391{
3392 struct nfs4_lockdata *data = calldata;
3393
3394 dprintk("%s: begin!\n", __FUNCTION__);
3395
3396 data->rpc_status = task->tk_status;
3397 if (RPC_ASSASSINATED(task))
3398 goto out;
3399 if (data->arg.new_lock_owner != 0) {
3400 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3401 if (data->rpc_status == 0)
3402 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3403 else
3404 goto out;
3405 }
3406 if (data->rpc_status == 0) {
3407 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3408 sizeof(data->lsp->ls_stateid.data));
3409 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3410 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3411 }
3412 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3413out:
3414 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3415}
3416
3417static void nfs4_lock_release(void *calldata)
3418{
3419 struct nfs4_lockdata *data = calldata;
3420
3421 dprintk("%s: begin!\n", __FUNCTION__);
a5d16a4d
TM		 3422 if (data->cancelled != 0) {
3423 struct rpc_task *task;
3424 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3425 data->arg.lock_seqid);
3426 if (!IS_ERR(task))
e6b3c4db 3427 rpc_put_task(task);
a5d16a4d
TM		 3428 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3429 } else
3430 nfs_free_seqid(data->arg.lock_seqid);
e6e21970
TM		 3431 if (data->arg.open_seqid != NULL)
3432 nfs_free_seqid(data->arg.open_seqid);
a5d16a4d
TM		 3433 nfs4_put_lock_state(data->lsp);
3434 put_nfs_open_context(data->ctx);
3435 kfree(data);
3436 dprintk("%s: done!\n", __FUNCTION__);
3437}
3438
3439static const struct rpc_call_ops nfs4_lock_ops = {
3440 .rpc_call_prepare = nfs4_lock_prepare,
3441 .rpc_call_done = nfs4_lock_done,
3442 .rpc_release = nfs4_lock_release,
3443};
3444
3445static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3446{
3447 struct nfs4_lockdata *data;
3448 struct rpc_task *task;
3449 int ret;
3450
3451 dprintk("%s: begin!\n", __FUNCTION__);
cd3758e3 3452 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3453 fl->fl_u.nfs4_fl.owner);
3454 if (data == NULL)
3455 return -ENOMEM;
3456 if (IS_SETLKW(cmd))
3457 data->arg.block = 1;
3458 if (reclaim != 0)
3459 data->arg.reclaim = 1;
3460 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3461 &nfs4_lock_ops, data);
7a1218a2 3462 if (IS_ERR(task))
a5d16a4d 3463 return PTR_ERR(task);
a5d16a4d
TM		 3464 ret = nfs4_wait_for_completion_rpc_task(task);
3465 if (ret == 0) {
3466 ret = data->rpc_status;
3467 if (ret == -NFS4ERR_DENIED)
3468 ret = -EAGAIN;
3469 } else
3470 data->cancelled = 1;
e6b3c4db 3471 rpc_put_task(task);
a5d16a4d
TM		 3472 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3473 return ret;
1da177e4
LT		 3474}
3475
3476static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3477{
202b50dc
TM		 3478 struct nfs_server *server = NFS_SERVER(state->inode);
3479 struct nfs4_exception exception = { };
3480 int err;
3481
3482 do {
42a2d13e
TM		 3483 /* Cache the lock if possible... */
3484 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3485 return 0;
202b50dc
TM		 3486 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3487 if (err != -NFS4ERR_DELAY)
3488 break;
3489 nfs4_handle_exception(server, err, &exception);
3490 } while (exception.retry);
3491 return err;
1da177e4
LT		 3492}
3493
3494static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3495{
202b50dc
TM		 3496 struct nfs_server *server = NFS_SERVER(state->inode);
3497 struct nfs4_exception exception = { };
3498 int err;
3499
6bfc93ef
TM		 3500 err = nfs4_set_lock_state(state, request);
3501 if (err != 0)
3502 return err;
202b50dc 3503 do {
42a2d13e
TM		 3504 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3505 return 0;
202b50dc
TM		 3506 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3507 if (err != -NFS4ERR_DELAY)
3508 break;
3509 nfs4_handle_exception(server, err, &exception);
3510 } while (exception.retry);
3511 return err;
1da177e4
LT		 3512}
3513
3514static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3515{
adfa6f98 3516 struct nfs_client *clp = state->owner->so_client;
01c3b861 3517 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3518 int status;
3519
6bfc93ef 3520 /* Is this a delegated open? */
6bfc93ef
TM		 3521 status = nfs4_set_lock_state(state, request);
3522 if (status != 0)
3523 goto out;
01c3b861
TM		 3524 request->fl_flags |= FL_ACCESS;
3525 status = do_vfs_lock(request->fl_file, request);
3526 if (status < 0)
3527 goto out;
3528 down_read(&clp->cl_sem);
3529 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3530 struct nfs_inode *nfsi = NFS_I(state->inode);
3531 /* Yes: cache locks! */
3532 down_read(&nfsi->rwsem);
3533 /* ...but avoid races with delegation recall... */
3534 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3535 request->fl_flags = fl_flags & ~FL_SLEEP;
3536 status = do_vfs_lock(request->fl_file, request);
3537 up_read(&nfsi->rwsem);
3538 goto out_unlock;
3539 }
3540 up_read(&nfsi->rwsem);
3541 }
6bfc93ef
TM		 3542 status = _nfs4_do_setlk(state, cmd, request, 0);
3543 if (status != 0)
01c3b861 3544 goto out_unlock;
6bfc93ef 3545 /* Note: we always want to sleep here! */
01c3b861 3546 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3547 if (do_vfs_lock(request->fl_file, request) < 0)
3548 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3549out_unlock:
1da177e4 3550 up_read(&clp->cl_sem);
01c3b861
TM		 3551out:
3552 request->fl_flags = fl_flags;
1da177e4
LT		 3553 return status;
3554}
3555
3556static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3557{
3558 struct nfs4_exception exception = { };
3559 int err;
3560
3561 do {
3562 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3563 _nfs4_proc_setlk(state, cmd, request),
3564 &exception);
3565 } while (exception.retry);
3566 return err;
3567}
3568
3569static int
3570nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3571{
3572 struct nfs_open_context *ctx;
3573 struct nfs4_state *state;
3574 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3575 int status;
3576
3577 /* verify open state */
cd3758e3 3578 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3579 state = ctx->state;
3580
3581 if (request->fl_start < 0 || request->fl_end < 0)
3582 return -EINVAL;
3583
3584 if (IS_GETLK(cmd))
3585 return nfs4_proc_getlk(state, F_GETLK, request);
3586
3587 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3588 return -EINVAL;
3589
3590 if (request->fl_type == F_UNLCK)
3591 return nfs4_proc_unlck(state, cmd, request);
3592
3593 do {
3594 status = nfs4_proc_setlk(state, cmd, request);
3595 if ((status != -EAGAIN) || IS_SETLK(cmd))
3596 break;
3597 timeout = nfs4_set_lock_task_retry(timeout);
3598 status = -ERESTARTSYS;
3599 if (signalled())
3600 break;
3601 } while(status < 0);
1da177e4
LT		 3602 return status;
3603}
3604
888e694c
TM		 3605int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3606{
3607 struct nfs_server *server = NFS_SERVER(state->inode);
3608 struct nfs4_exception exception = { };
3609 int err;
3610
3611 err = nfs4_set_lock_state(state, fl);
3612 if (err != 0)
3613 goto out;
3614 do {
3615 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3616 if (err != -NFS4ERR_DELAY)
3617 break;
3618 err = nfs4_handle_exception(server, err, &exception);
3619 } while (exception.retry);
3620out:
3621 return err;
3622}
6b3b5496 3623
aa1870af
BF		 3624#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3625
6b3b5496
BF		 3626int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3627 size_t buflen, int flags)
3628{
4b580ee3
BF		 3629 struct inode *inode = dentry->d_inode;
3630
3631 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3632 return -EOPNOTSUPP;
3633
3634 if (!S_ISREG(inode->i_mode) &&
3635 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3636 return -EPERM;
3637
3638 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3639}
3640
3641/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3642 * and that's what we'll do for e.g. user attributes that haven't been set.
3643 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3644 * attributes in kernel-managed attribute namespaces. */
3645ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3646 size_t buflen)
3647{
aa1870af
BF		 3648 struct inode *inode = dentry->d_inode;
3649
3650 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3651 return -EOPNOTSUPP;
3652
3653 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3654}
3655
3656ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3657{
aa1870af 3658 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3659
096455a2
BF		 3660 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3661 return 0;
6b3b5496
BF		 3662 if (buf && buflen < len)
3663 return -ERANGE;
3664 if (buf)
aa1870af
BF		 3665 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3666 return len;
6b3b5496
BF		 3667}
3668
56659e99 3669int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3670 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3671{
3672 struct nfs_server *server = NFS_SERVER(dir);
3673 u32 bitmask[2] = {
361e624f
MN		 3674 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3675 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3676 };
3677 struct nfs4_fs_locations_arg args = {
3678 .dir_fh = NFS_FH(dir),
c228fd3a 3679 .name = name,
683b57b4
TM		 3680 .page = page,
3681 .bitmask = bitmask,
3682 };
3683 struct rpc_message msg = {
3684 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3685 .rpc_argp = &args,
7aaa0b3b 3686 .rpc_resp = fs_locations,
683b57b4
TM		 3687 };
3688 int status;
3689
3690 dprintk("%s: start\n", __FUNCTION__);
c228fd3a 3691 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3692 fs_locations->server = server;
830b8e33 3693 fs_locations->nlocations = 0;
683b57b4
TM		 3694 status = rpc_call_sync(server->client, &msg, 0);
3695 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3696 return status;
3697}
3698
1da177e4
LT		 3699struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3700 .recover_open = nfs4_open_reclaim,
3701 .recover_lock = nfs4_lock_reclaim,
3702};
3703
3704struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3705 .recover_open = nfs4_open_expired,
3706 .recover_lock = nfs4_lock_expired,
3707};
3708
92e1d5be 3709static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3710 .permission = nfs_permission,
3711 .getattr = nfs_getattr,
3712 .setattr = nfs_setattr,
3713 .getxattr = nfs4_getxattr,
3714 .setxattr = nfs4_setxattr,
3715 .listxattr = nfs4_listxattr,
3716};
3717
509de811 3718const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3719 .version = 4, /* protocol version */
3720 .dentry_ops = &nfs4_dentry_operations,
3721 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3722 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3723 .getroot = nfs4_proc_get_root,
3724 .getattr = nfs4_proc_getattr,
3725 .setattr = nfs4_proc_setattr,
2b3de441 3726 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3727 .lookup = nfs4_proc_lookup,
3728 .access = nfs4_proc_access,
3729 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3730 .create = nfs4_proc_create,
3731 .remove = nfs4_proc_remove,
3732 .unlink_setup = nfs4_proc_unlink_setup,
3733 .unlink_done = nfs4_proc_unlink_done,
3734 .rename = nfs4_proc_rename,
3735 .link = nfs4_proc_link,
3736 .symlink = nfs4_proc_symlink,
3737 .mkdir = nfs4_proc_mkdir,
3738 .rmdir = nfs4_proc_remove,
3739 .readdir = nfs4_proc_readdir,
3740 .mknod = nfs4_proc_mknod,
3741 .statfs = nfs4_proc_statfs,
3742 .fsinfo = nfs4_proc_fsinfo,
3743 .pathconf = nfs4_proc_pathconf,
e9326dca 3744 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3745 .decode_dirent = nfs4_decode_dirent,
3746 .read_setup = nfs4_proc_read_setup,
ec06c096 3747 .read_done = nfs4_read_done,
1da177e4 3748 .write_setup = nfs4_proc_write_setup,
788e7a89 3749 .write_done = nfs4_write_done,
1da177e4 3750 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3751 .commit_done = nfs4_commit_done,
02a913a7
TM		 3752 .file_open = nfs_open,
3753 .file_release = nfs_release,
1da177e4 3754 .lock = nfs4_proc_lock,
e50a1c2e 3755 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3756};
3757
3758/*
3759 * Local variables:
3760 * c-basic-offset: 8
3761 * End:
3762 */
Linux 6.x block layer and io_uring tree(s)