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NFS: Fix a writeback race...
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
006ea73e 54#include "iostat.h"
1da177e4
LT		 55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
2066fe89 58#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
cdd4e68b 61struct nfs4_opendata;
864472e9 62static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
faf5f49c 65static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
adfa6f98 66static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
9936781d
TM		 67static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
68static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
1da177e4 69
1da177e4
LT		 70/* Prevent leaks of NFSv4 errors into userland */
71int nfs4_map_errors(int err)
72{
73 if (err < -1000) {
74 dprintk("%s could not handle NFSv4 error %d\n",
75 __FUNCTION__, -err);
76 return -EIO;
77 }
78 return err;
79}
80
81/*
82 * This is our standard bitmap for GETATTR requests.
83 */
84const u32 nfs4_fattr_bitmap[2] = {
85 FATTR4_WORD0_TYPE
86 | FATTR4_WORD0_CHANGE
87 | FATTR4_WORD0_SIZE
88 | FATTR4_WORD0_FSID
89 | FATTR4_WORD0_FILEID,
90 FATTR4_WORD1_MODE
91 | FATTR4_WORD1_NUMLINKS
92 | FATTR4_WORD1_OWNER
93 | FATTR4_WORD1_OWNER_GROUP
94 | FATTR4_WORD1_RAWDEV
95 | FATTR4_WORD1_SPACE_USED
96 | FATTR4_WORD1_TIME_ACCESS
97 | FATTR4_WORD1_TIME_METADATA
98 | FATTR4_WORD1_TIME_MODIFY
99};
100
101const u32 nfs4_statfs_bitmap[2] = {
102 FATTR4_WORD0_FILES_AVAIL
103 | FATTR4_WORD0_FILES_FREE
104 | FATTR4_WORD0_FILES_TOTAL,
105 FATTR4_WORD1_SPACE_AVAIL
106 | FATTR4_WORD1_SPACE_FREE
107 | FATTR4_WORD1_SPACE_TOTAL
108};
109
4ce79717 110const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 111 FATTR4_WORD0_MAXLINK
112 | FATTR4_WORD0_MAXNAME,
113 0
114};
115
116const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
117 | FATTR4_WORD0_MAXREAD
118 | FATTR4_WORD0_MAXWRITE
119 | FATTR4_WORD0_LEASE_TIME,
120 0
121};
122
830b8e33
MN		 123const u32 nfs4_fs_locations_bitmap[2] = {
124 FATTR4_WORD0_TYPE
125 | FATTR4_WORD0_CHANGE
126 | FATTR4_WORD0_SIZE
127 | FATTR4_WORD0_FSID
128 | FATTR4_WORD0_FILEID
129 | FATTR4_WORD0_FS_LOCATIONS,
130 FATTR4_WORD1_MODE
131 | FATTR4_WORD1_NUMLINKS
132 | FATTR4_WORD1_OWNER
133 | FATTR4_WORD1_OWNER_GROUP
134 | FATTR4_WORD1_RAWDEV
135 | FATTR4_WORD1_SPACE_USED
136 | FATTR4_WORD1_TIME_ACCESS
137 | FATTR4_WORD1_TIME_METADATA
138 | FATTR4_WORD1_TIME_MODIFY
139 | FATTR4_WORD1_MOUNTED_ON_FILEID
140};
141
bc4785cd 142static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 143 struct nfs4_readdir_arg *readdir)
144{
0dbb4c67 145 __be32 *start, *p;
1da177e4
LT		 146
147 BUG_ON(readdir->count < 80);
148 if (cookie > 2) {
b7ef1956 149 readdir->cookie = cookie;
1da177e4
LT		 150 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
151 return;
152 }
153
154 readdir->cookie = 0;
155 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
156 if (cookie == 2)
157 return;
158
159 /*
160 * NFSv4 servers do not return entries for '.' and '..'
161 * Therefore, we fake these entries here. We let '.'
162 * have cookie 0 and '..' have cookie 1. Note that
163 * when talking to the server, we always send cookie 0
164 * instead of 1 or 2.
165 */
0dbb4c67 166 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 167
168 if (cookie == 0) {
169 *p++ = xdr_one; /* next */
170 *p++ = xdr_zero; /* cookie, first word */
171 *p++ = xdr_one; /* cookie, second word */
172 *p++ = xdr_one; /* entry len */
173 memcpy(p, ".\0\0\0", 4); /* entry */
174 p++;
175 *p++ = xdr_one; /* bitmap length */
176 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
177 *p++ = htonl(8); /* attribute buffer length */
4e769b93 178 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
1da177e4
LT		 179 }
180
181 *p++ = xdr_one; /* next */
182 *p++ = xdr_zero; /* cookie, first word */
183 *p++ = xdr_two; /* cookie, second word */
184 *p++ = xdr_two; /* entry len */
185 memcpy(p, "..\0\0", 4); /* entry */
186 p++;
187 *p++ = xdr_one; /* bitmap length */
188 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
189 *p++ = htonl(8); /* attribute buffer length */
4e769b93 190 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
1da177e4
LT		 191
192 readdir->pgbase = (char *)p - (char *)start;
193 readdir->count -= readdir->pgbase;
194 kunmap_atomic(start, KM_USER0);
195}
196
26e976a8 197static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 198{
7539bbab 199 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 200 spin_lock(&clp->cl_lock);
201 if (time_before(clp->cl_last_renewal,timestamp))
202 clp->cl_last_renewal = timestamp;
203 spin_unlock(&clp->cl_lock);
204}
205
38478b24 206static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 207{
38478b24 208 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 209
38478b24 210 spin_lock(&dir->i_lock);
40d24704
TM		 211 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
212 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
213 nfsi->cache_change_attribute = jiffies;
214 nfsi->change_attr = cinfo->after;
38478b24 215 spin_unlock(&dir->i_lock);
1da177e4
LT		 216}
217
e56e0b78 218struct nfs4_opendata {
c6d00e63 219 struct kref kref;
e56e0b78
TM		 220 struct nfs_openargs o_arg;
221 struct nfs_openres o_res;
cdd4e68b
TM		 222 struct nfs_open_confirmargs c_arg;
223 struct nfs_open_confirmres c_res;
e56e0b78
TM		 224 struct nfs_fattr f_attr;
225 struct nfs_fattr dir_attr;
ad389da7 226 struct path path;
e56e0b78
TM		 227 struct dentry *dir;
228 struct nfs4_state_owner *owner;
aac00a8d 229 struct nfs4_state *state;
e56e0b78 230 struct iattr attrs;
26e976a8 231 unsigned long timestamp;
3e309914 232 unsigned int rpc_done : 1;
24ac23ab
TM		 233 int rpc_status;
234 int cancelled;
e56e0b78
TM		 235};
236
2ced46c2
TM		 237
238static void nfs4_init_opendata_res(struct nfs4_opendata *p)
239{
240 p->o_res.f_attr = &p->f_attr;
241 p->o_res.dir_attr = &p->dir_attr;
242 p->o_res.server = p->o_arg.server;
243 nfs_fattr_init(&p->f_attr);
244 nfs_fattr_init(&p->dir_attr);
245}
246
ad389da7 247static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
e56e0b78
TM		 248 struct nfs4_state_owner *sp, int flags,
249 const struct iattr *attrs)
250{
ad389da7 251 struct dentry *parent = dget_parent(path->dentry);
e56e0b78
TM		 252 struct inode *dir = parent->d_inode;
253 struct nfs_server *server = NFS_SERVER(dir);
254 struct nfs4_opendata *p;
255
256 p = kzalloc(sizeof(*p), GFP_KERNEL);
257 if (p == NULL)
258 goto err;
259 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
260 if (p->o_arg.seqid == NULL)
261 goto err_free;
ad389da7
TM		 262 p->path.mnt = mntget(path->mnt);
263 p->path.dentry = dget(path->dentry);
e56e0b78
TM		 264 p->dir = parent;
265 p->owner = sp;
266 atomic_inc(&sp->so_count);
267 p->o_arg.fh = NFS_FH(dir);
268 p->o_arg.open_flags = flags,
7539bbab 269 p->o_arg.clientid = server->nfs_client->cl_clientid;
9f958ab8 270 p->o_arg.id = sp->so_owner_id.id;
ad389da7 271 p->o_arg.name = &p->path.dentry->d_name;
e56e0b78
TM		 272 p->o_arg.server = server;
273 p->o_arg.bitmask = server->attr_bitmask;
274 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
e56e0b78
TM		 275 if (flags & O_EXCL) {
276 u32 *s = (u32 *) p->o_arg.u.verifier.data;
277 s[0] = jiffies;
278 s[1] = current->pid;
279 } else if (flags & O_CREAT) {
280 p->o_arg.u.attrs = &p->attrs;
281 memcpy(&p->attrs, attrs, sizeof(p->attrs));
282 }
cdd4e68b
TM		 283 p->c_arg.fh = &p->o_res.fh;
284 p->c_arg.stateid = &p->o_res.stateid;
285 p->c_arg.seqid = p->o_arg.seqid;
2ced46c2 286 nfs4_init_opendata_res(p);
c6d00e63 287 kref_init(&p->kref);
e56e0b78
TM		 288 return p;
289err_free:
290 kfree(p);
291err:
292 dput(parent);
293 return NULL;
294}
295
c6d00e63 296static void nfs4_opendata_free(struct kref *kref)
e56e0b78 297{
c6d00e63
TM		 298 struct nfs4_opendata *p = container_of(kref,
299 struct nfs4_opendata, kref);
300
301 nfs_free_seqid(p->o_arg.seqid);
aac00a8d
TM		 302 if (p->state != NULL)
303 nfs4_put_open_state(p->state);
c6d00e63
TM		 304 nfs4_put_state_owner(p->owner);
305 dput(p->dir);
306 dput(p->path.dentry);
307 mntput(p->path.mnt);
308 kfree(p);
309}
310
311static void nfs4_opendata_put(struct nfs4_opendata *p)
312{
313 if (p != NULL)
314 kref_put(&p->kref, nfs4_opendata_free);
e56e0b78
TM		 315}
316
06f814a3
TM		 317static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
318{
319 sigset_t oldset;
320 int ret;
321
322 rpc_clnt_sigmask(task->tk_client, &oldset);
323 ret = rpc_wait_for_completion_task(task);
324 rpc_clnt_sigunmask(task->tk_client, &oldset);
325 return ret;
326}
327
6ee41268
TM		 328static int can_open_cached(struct nfs4_state *state, int mode)
329{
330 int ret = 0;
331 switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
332 case FMODE_READ:
333 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
6ee41268
TM		 334 break;
335 case FMODE_WRITE:
336 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
6ee41268
TM		 337 break;
338 case FMODE_READ|FMODE_WRITE:
339 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
340 }
341 return ret;
342}
343
aac00a8d
TM		 344static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
345{
346 if ((delegation->type & open_flags) != open_flags)
347 return 0;
348 if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
349 return 0;
350 return 1;
351}
352
003707c7 353static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
e7616923
TM		 354{
355 switch (open_flags) {
356 case FMODE_WRITE:
357 state->n_wronly++;
358 break;
359 case FMODE_READ:
360 state->n_rdonly++;
361 break;
362 case FMODE_READ|FMODE_WRITE:
363 state->n_rdwr++;
364 }
003707c7
TM		 365 nfs4_state_set_mode_locked(state, state->state | open_flags);
366}
367
368static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
369{
370 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
371 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
372 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
373 switch (open_flags) {
374 case FMODE_READ:
375 set_bit(NFS_O_RDONLY_STATE, &state->flags);
376 break;
377 case FMODE_WRITE:
378 set_bit(NFS_O_WRONLY_STATE, &state->flags);
379 break;
380 case FMODE_READ|FMODE_WRITE:
381 set_bit(NFS_O_RDWR_STATE, &state->flags);
382 }
e7616923
TM		 383}
384
003707c7
TM		 385static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
386{
8bda4e4c 387 write_seqlock(&state->seqlock);
003707c7 388 nfs_set_open_stateid_locked(state, stateid, open_flags);
8bda4e4c 389 write_sequnlock(&state->seqlock);
003707c7
TM		 390}
391
392static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
1da177e4 393{
1da177e4 394 open_flags &= (FMODE_READ|FMODE_WRITE);
8bda4e4c
TM		 395 /*
396 * Protect the call to nfs4_state_set_mode_locked and
397 * serialise the stateid update
398 */
399 write_seqlock(&state->seqlock);
003707c7
TM		 400 if (deleg_stateid != NULL) {
401 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
402 set_bit(NFS_DELEGATED_STATE, &state->flags);
403 }
404 if (open_stateid != NULL)
405 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
8bda4e4c
TM		 406 write_sequnlock(&state->seqlock);
407 spin_lock(&state->owner->so_lock);
e7616923 408 update_open_stateflags(state, open_flags);
ec073428 409 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 410}
411
aac00a8d
TM		 412static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
413{
414 struct nfs_delegation *delegation;
415
416 rcu_read_lock();
417 delegation = rcu_dereference(NFS_I(inode)->delegation);
418 if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
419 rcu_read_unlock();
420 return;
421 }
422 rcu_read_unlock();
423 nfs_inode_return_delegation(inode);
424}
425
6ee41268 426static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
aac00a8d
TM		 427{
428 struct nfs4_state *state = opendata->state;
429 struct nfs_inode *nfsi = NFS_I(state->inode);
430 struct nfs_delegation *delegation;
431 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
432 nfs4_stateid stateid;
433 int ret = -EAGAIN;
434
435 rcu_read_lock();
436 delegation = rcu_dereference(nfsi->delegation);
aac00a8d 437 for (;;) {
6ee41268
TM		 438 if (can_open_cached(state, open_mode)) {
439 spin_lock(&state->owner->so_lock);
440 if (can_open_cached(state, open_mode)) {
441 update_open_stateflags(state, open_mode);
442 spin_unlock(&state->owner->so_lock);
443 rcu_read_unlock();
444 goto out_return_state;
445 }
446 spin_unlock(&state->owner->so_lock);
447 }
448 if (delegation == NULL)
449 break;
aac00a8d
TM		 450 if (!can_open_delegated(delegation, open_mode))
451 break;
452 /* Save the delegation */
453 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
454 rcu_read_unlock();
455 lock_kernel();
af22f94a 456 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
aac00a8d
TM		 457 unlock_kernel();
458 if (ret != 0)
459 goto out;
460 ret = -EAGAIN;
461 rcu_read_lock();
462 delegation = rcu_dereference(nfsi->delegation);
6ee41268 463 /* If no delegation, try a cached open */
aac00a8d 464 if (delegation == NULL)
6ee41268 465 continue;
aac00a8d
TM		 466 /* Is the delegation still valid? */
467 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
468 continue;
469 rcu_read_unlock();
470 update_open_stateid(state, NULL, &stateid, open_mode);
471 goto out_return_state;
472 }
aac00a8d
TM		 473 rcu_read_unlock();
474out:
475 return ERR_PTR(ret);
476out_return_state:
477 atomic_inc(&state->count);
478 return state;
479}
480
24ac23ab
TM		 481static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
482{
483 struct inode *inode;
484 struct nfs4_state *state = NULL;
003707c7
TM		 485 struct nfs_delegation *delegation;
486 nfs4_stateid *deleg_stateid = NULL;
1b370bc2 487 int ret;
24ac23ab 488
aac00a8d 489 if (!data->rpc_done) {
6ee41268 490 state = nfs4_try_open_cached(data);
aac00a8d
TM		 491 goto out;
492 }
493
1b370bc2 494 ret = -EAGAIN;
24ac23ab 495 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1b370bc2 496 goto err;
24ac23ab 497 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1b370bc2 498 ret = PTR_ERR(inode);
03f28e3a 499 if (IS_ERR(inode))
1b370bc2
TM		 500 goto err;
501 ret = -ENOMEM;
24ac23ab
TM		 502 state = nfs4_get_open_state(inode, data->owner);
503 if (state == NULL)
1b370bc2 504 goto err_put_inode;
549d6ed5 505 if (data->o_res.delegation_type != 0) {
549d6ed5
TM		 506 int delegation_flags = 0;
507
003707c7
TM		 508 rcu_read_lock();
509 delegation = rcu_dereference(NFS_I(inode)->delegation);
510 if (delegation)
511 delegation_flags = delegation->flags;
512 rcu_read_unlock();
549d6ed5
TM		 513 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
514 nfs_inode_set_delegation(state->inode,
515 data->owner->so_cred,
516 &data->o_res);
517 else
518 nfs_inode_reclaim_delegation(state->inode,
519 data->owner->so_cred,
520 &data->o_res);
521 }
003707c7
TM		 522 rcu_read_lock();
523 delegation = rcu_dereference(NFS_I(inode)->delegation);
524 if (delegation != NULL)
525 deleg_stateid = &delegation->stateid;
526 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
527 rcu_read_unlock();
24ac23ab 528 iput(inode);
aac00a8d 529out:
24ac23ab 530 return state;
1b370bc2
TM		 531err_put_inode:
532 iput(inode);
533err:
534 return ERR_PTR(ret);
24ac23ab
TM		 535}
536
864472e9
TM		 537static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
538{
539 struct nfs_inode *nfsi = NFS_I(state->inode);
540 struct nfs_open_context *ctx;
541
542 spin_lock(&state->inode->i_lock);
543 list_for_each_entry(ctx, &nfsi->open_files, list) {
544 if (ctx->state != state)
545 continue;
546 get_nfs_open_context(ctx);
547 spin_unlock(&state->inode->i_lock);
548 return ctx;
549 }
550 spin_unlock(&state->inode->i_lock);
551 return ERR_PTR(-ENOENT);
552}
553
6f220ed5
TM		 554static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
555{
556 struct nfs4_opendata *opendata;
557
558 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
559 if (opendata == NULL)
560 return ERR_PTR(-ENOMEM);
561 opendata->state = state;
562 atomic_inc(&state->count);
563 return opendata;
564}
565
2ced46c2 566static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
864472e9 567{
2ced46c2 568 struct nfs4_state *newstate;
864472e9
TM		 569 int ret;
570
571 opendata->o_arg.open_flags = openflags;
2ced46c2
TM		 572 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
573 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
574 nfs4_init_opendata_res(opendata);
864472e9
TM		 575 ret = _nfs4_proc_open(opendata);
576 if (ret != 0)
577 return ret;
2ced46c2 578 newstate = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 579 if (IS_ERR(newstate))
580 return PTR_ERR(newstate);
581 nfs4_close_state(&opendata->path, newstate, openflags);
2ced46c2 582 *res = newstate;
864472e9
TM		 583 return 0;
584}
585
586static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
587{
864472e9 588 struct nfs4_state *newstate;
864472e9
TM		 589 int ret;
590
591 /* memory barrier prior to reading state->n_* */
2ced46c2 592 clear_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9
TM		 593 smp_rmb();
594 if (state->n_rdwr != 0) {
2ced46c2 595 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
864472e9
TM		 596 if (ret != 0)
597 return ret;
2ced46c2
TM		 598 if (newstate != state)
599 return -ESTALE;
864472e9
TM		 600 }
601 if (state->n_wronly != 0) {
2ced46c2 602 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
864472e9
TM		 603 if (ret != 0)
604 return ret;
2ced46c2
TM		 605 if (newstate != state)
606 return -ESTALE;
864472e9
TM		 607 }
608 if (state->n_rdonly != 0) {
2ced46c2 609 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
864472e9
TM		 610 if (ret != 0)
611 return ret;
2ced46c2
TM		 612 if (newstate != state)
613 return -ESTALE;
864472e9 614 }
1ac7e2fd
TM		 615 /*
616 * We may have performed cached opens for all three recoveries.
617 * Check if we need to update the current stateid.
618 */
619 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
620 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
8bda4e4c 621 write_seqlock(&state->seqlock);
1ac7e2fd
TM		 622 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
623 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
8bda4e4c 624 write_sequnlock(&state->seqlock);
1ac7e2fd 625 }
864472e9
TM		 626 return 0;
627}
628
1da177e4
LT		 629/*
630 * OPEN_RECLAIM:
631 * reclaim state on the server after a reboot.
1da177e4 632 */
539cd03a 633static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 634{
1ac7e2fd 635 struct nfs_delegation *delegation;
864472e9
TM		 636 struct nfs4_opendata *opendata;
637 int delegation_type = 0;
1da177e4
LT		 638 int status;
639
6f220ed5
TM		 640 opendata = nfs4_open_recoverdata_alloc(ctx, state);
641 if (IS_ERR(opendata))
642 return PTR_ERR(opendata);
864472e9
TM		 643 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
644 opendata->o_arg.fh = NFS_FH(state->inode);
1ac7e2fd
TM		 645 rcu_read_lock();
646 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
647 if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
65bbf6bd 648 delegation_type = delegation->type;
1ac7e2fd 649 rcu_read_unlock();
864472e9
TM		 650 opendata->o_arg.u.delegation_type = delegation_type;
651 status = nfs4_open_recover(opendata, state);
c6d00e63 652 nfs4_opendata_put(opendata);
1da177e4
LT		 653 return status;
654}
655
539cd03a 656static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 657{
658 struct nfs_server *server = NFS_SERVER(state->inode);
659 struct nfs4_exception exception = { };
660 int err;
661 do {
539cd03a 662 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 663 if (err != -NFS4ERR_DELAY)
664 break;
665 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 666 } while (exception.retry);
667 return err;
668}
669
864472e9
TM		 670static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
671{
672 struct nfs_open_context *ctx;
673 int ret;
674
675 ctx = nfs4_state_find_open_context(state);
676 if (IS_ERR(ctx))
677 return PTR_ERR(ctx);
539cd03a 678 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 679 put_nfs_open_context(ctx);
680 return ret;
681}
682
13437e12 683static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4 684{
e56e0b78 685 struct nfs4_opendata *opendata;
864472e9 686 int ret;
1da177e4 687
6f220ed5
TM		 688 opendata = nfs4_open_recoverdata_alloc(ctx, state);
689 if (IS_ERR(opendata))
690 return PTR_ERR(opendata);
e56e0b78 691 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
13437e12 692 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
e56e0b78 693 sizeof(opendata->o_arg.u.delegation.data));
864472e9 694 ret = nfs4_open_recover(opendata, state);
c6d00e63 695 nfs4_opendata_put(opendata);
864472e9 696 return ret;
1da177e4
LT		 697}
698
13437e12 699int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 700{
701 struct nfs4_exception exception = { };
539cd03a 702 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 703 int err;
704 do {
13437e12 705 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1da177e4
LT		 706 switch (err) {
707 case 0:
708 return err;
709 case -NFS4ERR_STALE_CLIENTID:
710 case -NFS4ERR_STALE_STATEID:
711 case -NFS4ERR_EXPIRED:
712 /* Don't recall a delegation if it was lost */
7539bbab 713 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 714 return err;
715 }
716 err = nfs4_handle_exception(server, err, &exception);
717 } while (exception.retry);
718 return err;
719}
720
cdd4e68b 721static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1da177e4 722{
cdd4e68b
TM		 723 struct nfs4_opendata *data = calldata;
724 struct rpc_message msg = {
725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
726 .rpc_argp = &data->c_arg,
727 .rpc_resp = &data->c_res,
728 .rpc_cred = data->owner->so_cred,
1da177e4 729 };
26e976a8 730 data->timestamp = jiffies;
cdd4e68b
TM		 731 rpc_call_setup(task, &msg, 0);
732}
733
734static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
735{
736 struct nfs4_opendata *data = calldata;
737
738 data->rpc_status = task->tk_status;
739 if (RPC_ASSASSINATED(task))
740 return;
26e976a8 741 if (data->rpc_status == 0) {
cdd4e68b
TM		 742 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
743 sizeof(data->o_res.stateid.data));
26e976a8 744 renew_lease(data->o_res.server, data->timestamp);
3e309914 745 data->rpc_done = 1;
26e976a8 746 }
cdd4e68b 747 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
0f9f95e0 748 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
cdd4e68b
TM		 749}
750
751static void nfs4_open_confirm_release(void *calldata)
752{
753 struct nfs4_opendata *data = calldata;
754 struct nfs4_state *state = NULL;
755
756 /* If this request hasn't been cancelled, do nothing */
757 if (data->cancelled == 0)
758 goto out_free;
759 /* In case of error, no cleanup! */
3e309914 760 if (!data->rpc_done)
cdd4e68b
TM		 761 goto out_free;
762 nfs_confirm_seqid(&data->owner->so_seqid, 0);
763 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 764 if (!IS_ERR(state))
4a35bd41 765 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 766out_free:
c6d00e63 767 nfs4_opendata_put(data);
cdd4e68b
TM		 768}
769
770static const struct rpc_call_ops nfs4_open_confirm_ops = {
771 .rpc_call_prepare = nfs4_open_confirm_prepare,
772 .rpc_call_done = nfs4_open_confirm_done,
773 .rpc_release = nfs4_open_confirm_release,
774};
775
776/*
777 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
778 */
779static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
780{
781 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
782 struct rpc_task *task;
1da177e4
LT		 783 int status;
784
c6d00e63 785 kref_get(&data->kref);
3e309914
TM		 786 data->rpc_done = 0;
787 data->rpc_status = 0;
cdd4e68b 788 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
7a1218a2 789 if (IS_ERR(task))
cdd4e68b 790 return PTR_ERR(task);
cdd4e68b
TM		 791 status = nfs4_wait_for_completion_rpc_task(task);
792 if (status != 0) {
793 data->cancelled = 1;
794 smp_wmb();
795 } else
796 status = data->rpc_status;
e6b3c4db 797 rpc_put_task(task);
1da177e4
LT		 798 return status;
799}
800
24ac23ab 801static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 802{
24ac23ab
TM		 803 struct nfs4_opendata *data = calldata;
804 struct nfs4_state_owner *sp = data->owner;
1da177e4
LT		 805 struct rpc_message msg = {
806 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
24ac23ab
TM		 807 .rpc_argp = &data->o_arg,
808 .rpc_resp = &data->o_res,
1da177e4
LT		 809 .rpc_cred = sp->so_cred,
810 };
24ac23ab
TM		 811
812 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
813 return;
aac00a8d
TM		 814 /*
815 * Check if we still need to send an OPEN call, or if we can use
816 * a delegation instead.
817 */
818 if (data->state != NULL) {
819 struct nfs_delegation *delegation;
820
6ee41268
TM		 821 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
822 goto out_no_action;
aac00a8d
TM		 823 rcu_read_lock();
824 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
825 if (delegation != NULL &&
826 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
827 rcu_read_unlock();
6ee41268 828 goto out_no_action;
aac00a8d
TM		 829 }
830 rcu_read_unlock();
831 }
24ac23ab 832 /* Update sequence id. */
9f958ab8 833 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 834 data->o_arg.clientid = sp->so_client->cl_clientid;
6f220ed5 835 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
864472e9 836 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
6f220ed5
TM		 837 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
838 }
26e976a8 839 data->timestamp = jiffies;
24ac23ab 840 rpc_call_setup(task, &msg, 0);
6ee41268
TM		 841 return;
842out_no_action:
843 task->tk_action = NULL;
844
24ac23ab 845}
1da177e4 846
24ac23ab
TM		 847static void nfs4_open_done(struct rpc_task *task, void *calldata)
848{
849 struct nfs4_opendata *data = calldata;
1da177e4 850
24ac23ab
TM		 851 data->rpc_status = task->tk_status;
852 if (RPC_ASSASSINATED(task))
853 return;
854 if (task->tk_status == 0) {
855 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 856 case S_IFREG:
857 break;
858 case S_IFLNK:
24ac23ab 859 data->rpc_status = -ELOOP;
6f926b5b
TM		 860 break;
861 case S_IFDIR:
24ac23ab 862 data->rpc_status = -EISDIR;
6f926b5b
TM		 863 break;
864 default:
24ac23ab 865 data->rpc_status = -ENOTDIR;
6f926b5b 866 }
26e976a8 867 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 868 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
869 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 870 }
24ac23ab 871 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
3e309914 872 data->rpc_done = 1;
24ac23ab 873}
6f926b5b 874
24ac23ab
TM		 875static void nfs4_open_release(void *calldata)
876{
877 struct nfs4_opendata *data = calldata;
878 struct nfs4_state *state = NULL;
879
880 /* If this request hasn't been cancelled, do nothing */
881 if (data->cancelled == 0)
882 goto out_free;
883 /* In case of error, no cleanup! */
3e309914 884 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 885 goto out_free;
886 /* In case we need an open_confirm, no cleanup! */
887 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
888 goto out_free;
889 nfs_confirm_seqid(&data->owner->so_seqid, 0);
890 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 891 if (!IS_ERR(state))
4a35bd41 892 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 893out_free:
c6d00e63 894 nfs4_opendata_put(data);
24ac23ab
TM		 895}
896
897static const struct rpc_call_ops nfs4_open_ops = {
898 .rpc_call_prepare = nfs4_open_prepare,
899 .rpc_call_done = nfs4_open_done,
900 .rpc_release = nfs4_open_release,
901};
902
903/*
904 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
905 */
906static int _nfs4_proc_open(struct nfs4_opendata *data)
907{
908 struct inode *dir = data->dir->d_inode;
909 struct nfs_server *server = NFS_SERVER(dir);
910 struct nfs_openargs *o_arg = &data->o_arg;
911 struct nfs_openres *o_res = &data->o_res;
912 struct rpc_task *task;
913 int status;
914
c6d00e63 915 kref_get(&data->kref);
3e309914
TM		 916 data->rpc_done = 0;
917 data->rpc_status = 0;
2ced46c2 918 data->cancelled = 0;
24ac23ab 919 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
7a1218a2 920 if (IS_ERR(task))
24ac23ab 921 return PTR_ERR(task);
24ac23ab
TM		 922 status = nfs4_wait_for_completion_rpc_task(task);
923 if (status != 0) {
924 data->cancelled = 1;
925 smp_wmb();
926 } else
927 status = data->rpc_status;
e6b3c4db 928 rpc_put_task(task);
3e309914 929 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 930 return status;
931
9936781d
TM		 932 if (o_res->fh.size == 0)
933 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
934
56ae19f3
TM		 935 if (o_arg->open_flags & O_CREAT) {
936 update_changeattr(dir, &o_res->cinfo);
937 nfs_post_op_update_inode(dir, o_res->dir_attr);
938 } else
939 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 940 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 941 status = _nfs4_proc_open_confirm(data);
1da177e4 942 if (status != 0)
24ac23ab 943 return status;
1da177e4
LT		 944 }
945 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
9936781d 946 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 947 return 0;
1da177e4
LT		 948}
949
10afec90 950static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 951{
7539bbab 952 struct nfs_client *clp = server->nfs_client;
6b30954e 953 int ret;
58d9714a 954
6b30954e
TM		 955 for (;;) {
956 ret = nfs4_wait_clnt_recover(server->client, clp);
957 if (ret != 0)
958 return ret;
959 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
960 break;
58d9714a 961 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 962 }
963 return 0;
58d9714a
TM		 964}
965
1da177e4
LT		 966/*
967 * OPEN_EXPIRED:
968 * reclaim state on the server after a network partition.
969 * Assumes caller holds the appropriate lock
970 */
539cd03a 971static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 972{
e56e0b78 973 struct nfs4_opendata *opendata;
864472e9 974 int ret;
1da177e4 975
6f220ed5
TM		 976 opendata = nfs4_open_recoverdata_alloc(ctx, state);
977 if (IS_ERR(opendata))
978 return PTR_ERR(opendata);
864472e9
TM		 979 ret = nfs4_open_recover(opendata, state);
980 if (ret == -ESTALE) {
981 /* Invalidate the state owner so we don't ever use it again */
539cd03a
TM		 982 nfs4_drop_state_owner(state->owner);
983 d_drop(ctx->path.dentry);
1da177e4 984 }
c6d00e63 985 nfs4_opendata_put(opendata);
864472e9 986 return ret;
1da177e4
LT		 987}
988
539cd03a 989static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 990{
539cd03a 991 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 992 struct nfs4_exception exception = { };
993 int err;
994
995 do {
539cd03a 996 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 997 if (err == -NFS4ERR_DELAY)
998 nfs4_handle_exception(server, err, &exception);
999 } while (exception.retry);
1000 return err;
1001}
1002
1da177e4
LT		 1003static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1004{
1da177e4 1005 struct nfs_open_context *ctx;
864472e9 1006 int ret;
1da177e4 1007
864472e9
TM		 1008 ctx = nfs4_state_find_open_context(state);
1009 if (IS_ERR(ctx))
1010 return PTR_ERR(ctx);
539cd03a 1011 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1012 put_nfs_open_context(ctx);
1013 return ret;
1da177e4
LT		 1014}
1015
aa53ed54
JL		 1016/*
1017 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1018 * fields corresponding to attributes that were used to store the verifier.
1019 * Make sure we clobber those fields in the later setattr call
1020 */
1021static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1022{
1023 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1024 !(sattr->ia_valid & ATTR_ATIME_SET))
1025 sattr->ia_valid |= ATTR_ATIME;
1026
1027 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1028 !(sattr->ia_valid & ATTR_MTIME_SET))
1029 sattr->ia_valid |= ATTR_MTIME;
1030}
1031
1da177e4 1032/*
24ac23ab 1033 * Returns a referenced nfs4_state
1da177e4 1034 */
ad389da7 1035static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1da177e4
LT		 1036{
1037 struct nfs4_state_owner *sp;
1038 struct nfs4_state *state = NULL;
1039 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 1040 struct nfs_client *clp = server->nfs_client;
e56e0b78 1041 struct nfs4_opendata *opendata;
aac00a8d 1042 int status;
1da177e4
LT		 1043
1044 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1045 status = -ENOMEM;
1046 if (!(sp = nfs4_get_state_owner(server, cred))) {
1047 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1048 goto out_err;
1049 }
58d9714a
TM		 1050 status = nfs4_recover_expired_lease(server);
1051 if (status != 0)
b4454fe1 1052 goto err_put_state_owner;
aac00a8d
TM		 1053 if (path->dentry->d_inode != NULL)
1054 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a
TM		 1055 down_read(&clp->cl_sem);
1056 status = -ENOMEM;
ad389da7 1057 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1058 if (opendata == NULL)
76723de0 1059 goto err_release_rwsem;
1da177e4 1060
aac00a8d
TM		 1061 if (path->dentry->d_inode != NULL)
1062 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1063
24ac23ab 1064 status = _nfs4_proc_open(opendata);
1da177e4 1065 if (status != 0)
c6d00e63 1066 goto err_opendata_put;
1da177e4 1067
aa53ed54
JL		 1068 if (opendata->o_arg.open_flags & O_EXCL)
1069 nfs4_exclusive_attrset(opendata, sattr);
1070
24ac23ab 1071 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1072 status = PTR_ERR(state);
1073 if (IS_ERR(state))
c6d00e63 1074 goto err_opendata_put;
c6d00e63 1075 nfs4_opendata_put(opendata);
1da177e4
LT		 1076 nfs4_put_state_owner(sp);
1077 up_read(&clp->cl_sem);
1078 *res = state;
1079 return 0;
c6d00e63
TM		 1080err_opendata_put:
1081 nfs4_opendata_put(opendata);
76723de0
TM		 1082err_release_rwsem:
1083 up_read(&clp->cl_sem);
e56e0b78
TM		 1084err_put_state_owner:
1085 nfs4_put_state_owner(sp);
1da177e4 1086out_err:
1da177e4
LT		 1087 *res = NULL;
1088 return status;
1089}
1090
1091
ad389da7 1092static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1093{
1094 struct nfs4_exception exception = { };
1095 struct nfs4_state *res;
1096 int status;
1097
1098 do {
ad389da7 1099 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1100 if (status == 0)
1101 break;
1102 /* NOTE: BAD_SEQID means the server and client disagree about the
1103 * book-keeping w.r.t. state-changing operations
1104 * (OPEN/CLOSE/LOCK/LOCKU...)
1105 * It is actually a sign of a bug on the client or on the server.
1106 *
1107 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1108 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1109 * have unhashed the old state_owner for us, and that we can
1110 * therefore safely retry using a new one. We should still warn
1111 * the user though...
1112 */
1113 if (status == -NFS4ERR_BAD_SEQID) {
6f43ddcc
TM		 1114 printk(KERN_WARNING "NFS: v4 server %s "
1115 " returned a bad sequence-id error!\n",
1116 NFS_SERVER(dir)->nfs_client->cl_hostname);
1da177e4
LT		 1117 exception.retry = 1;
1118 continue;
1119 }
550f5747
TM		 1120 /*
1121 * BAD_STATEID on OPEN means that the server cancelled our
1122 * state before it received the OPEN_CONFIRM.
1123 * Recover by retrying the request as per the discussion
1124 * on Page 181 of RFC3530.
1125 */
1126 if (status == -NFS4ERR_BAD_STATEID) {
1127 exception.retry = 1;
1128 continue;
1129 }
aac00a8d
TM		 1130 if (status == -EAGAIN) {
1131 /* We must have found a delegation */
1132 exception.retry = 1;
1133 continue;
1134 }
1da177e4
LT		 1135 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1136 status, &exception));
1137 } while (exception.retry);
1138 return res;
1139}
1140
3e4f6290
TM		 1141static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1142 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1143{
3e4f6290 1144 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1145 struct nfs_setattrargs arg = {
3e4f6290 1146 .fh = NFS_FH(inode),
1da177e4
LT		 1147 .iap = sattr,
1148 .server = server,
1149 .bitmask = server->attr_bitmask,
1150 };
1151 struct nfs_setattrres res = {
1152 .fattr = fattr,
1153 .server = server,
1154 };
1155 struct rpc_message msg = {
1156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1157 .rpc_argp = &arg,
1158 .rpc_resp = &res,
1159 };
26e976a8 1160 unsigned long timestamp = jiffies;
65e4308d 1161 int status;
1da177e4 1162
0e574af1 1163 nfs_fattr_init(fattr);
1da177e4 1164
3e4f6290
TM		 1165 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1166 /* Use that stateid */
1167 } else if (state != NULL) {
1da177e4 1168 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1169 nfs4_copy_stateid(&arg.stateid, state, current->files);
1170 } else
1da177e4
LT		 1171 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1172
65e4308d 1173 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1174 if (status == 0 && state != NULL)
1175 renew_lease(server, timestamp);
65e4308d 1176 return status;
1da177e4
LT		 1177}
1178
3e4f6290
TM		 1179static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1180 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1181{
3e4f6290 1182 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1183 struct nfs4_exception exception = { };
1184 int err;
1185 do {
1186 err = nfs4_handle_exception(server,
3e4f6290 1187 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1188 &exception);
1189 } while (exception.retry);
1190 return err;
1191}
1192
1193struct nfs4_closedata {
4a35bd41 1194 struct path path;
1da177e4
LT		 1195 struct inode *inode;
1196 struct nfs4_state *state;
1197 struct nfs_closeargs arg;
1198 struct nfs_closeres res;
516a6af6 1199 struct nfs_fattr fattr;
26e976a8 1200 unsigned long timestamp;
1da177e4
LT		 1201};
1202
963d8fe5 1203static void nfs4_free_closedata(void *data)
9512135d 1204{
963d8fe5
TM		 1205 struct nfs4_closedata *calldata = data;
1206 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1207
1208 nfs4_put_open_state(calldata->state);
1209 nfs_free_seqid(calldata->arg.seqid);
9512135d 1210 nfs4_put_state_owner(sp);
4a35bd41
TM		 1211 dput(calldata->path.dentry);
1212 mntput(calldata->path.mnt);
9512135d
TM		 1213 kfree(calldata);
1214}
1215
963d8fe5 1216static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1217{
963d8fe5 1218 struct nfs4_closedata *calldata = data;
1da177e4 1219 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1220 struct nfs_server *server = NFS_SERVER(calldata->inode);
1221
4ce70ada
TM		 1222 if (RPC_ASSASSINATED(task))
1223 return;
1da177e4
LT		 1224 /* hmm. we are done with the inode, and in the process of freeing
1225 * the state_owner. we keep this around to process errors
1226 */
cee54fc9 1227 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1228 switch (task->tk_status) {
1229 case 0:
45328c35 1230 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
26e976a8 1231 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1232 break;
1233 case -NFS4ERR_STALE_STATEID:
1234 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1235 break;
1236 default:
1237 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1238 rpc_restart_call(task);
1239 return;
1240 }
1241 }
516a6af6 1242 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1243}
1244
4ce70ada 1245static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1246{
4ce70ada 1247 struct nfs4_closedata *calldata = data;
9512135d 1248 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1249 struct rpc_message msg = {
1250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1251 .rpc_argp = &calldata->arg,
1252 .rpc_resp = &calldata->res,
9512135d 1253 .rpc_cred = state->owner->so_cred,
1da177e4 1254 };
003707c7 1255 int clear_rd, clear_wr, clear_rdwr;
9512135d 1256
963d8fe5 1257 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1258 return;
003707c7 1259
003707c7 1260 clear_rd = clear_wr = clear_rdwr = 0;
4cecb76f 1261 spin_lock(&state->owner->so_lock);
003707c7 1262 /* Calculate the change in open mode */
e7616923 1263 if (state->n_rdwr == 0) {
003707c7 1264 if (state->n_rdonly == 0) {
003707c7
TM		 1265 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1266 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1267 }
1268 if (state->n_wronly == 0) {
003707c7
TM		 1269 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1270 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1271 }
e7616923 1272 }
4cecb76f 1273 spin_unlock(&state->owner->so_lock);
003707c7 1274 if (!clear_rd && !clear_wr && !clear_rdwr) {
963d8fe5
TM		 1275 /* Note: exit _without_ calling nfs4_close_done */
1276 task->tk_action = NULL;
9512135d
TM		 1277 return;
1278 }
516a6af6 1279 nfs_fattr_init(calldata->res.fattr);
45328c35 1280 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1da177e4 1281 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1282 calldata->arg.open_flags = FMODE_READ;
1283 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1284 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1285 calldata->arg.open_flags = FMODE_WRITE;
1286 }
26e976a8 1287 calldata->timestamp = jiffies;
9512135d 1288 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1289}
1290
963d8fe5 1291static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1292 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1293 .rpc_call_done = nfs4_close_done,
1294 .rpc_release = nfs4_free_closedata,
1295};
1296
1da177e4
LT		 1297/*
1298 * It is possible for data to be read/written from a mem-mapped file
1299 * after the sys_close call (which hits the vfs layer as a flush).
1300 * This means that we can't safely call nfsv4 close on a file until
1301 * the inode is cleared. This in turn means that we are not good
1302 * NFSv4 citizens - we do not indicate to the server to update the file's
1303 * share state even when we are done with one of the three share
1304 * stateid's in the inode.
1305 *
1306 * NOTE: Caller must be holding the sp->so_owner semaphore!
1307 */
4a35bd41 1308int nfs4_do_close(struct path *path, struct nfs4_state *state)
1da177e4 1309{
4a35bd41 1310 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4 1311 struct nfs4_closedata *calldata;
b39e625b
TM		 1312 struct nfs4_state_owner *sp = state->owner;
1313 struct rpc_task *task;
9512135d 1314 int status = -ENOMEM;
1da177e4 1315
9512135d 1316 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1317 if (calldata == NULL)
9512135d 1318 goto out;
4a35bd41 1319 calldata->inode = state->inode;
1da177e4 1320 calldata->state = state;
4a35bd41 1321 calldata->arg.fh = NFS_FH(state->inode);
003707c7 1322 calldata->arg.stateid = &state->open_stateid;
1da177e4 1323 /* Serialization for the sequence id */
cee54fc9 1324 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1325 if (calldata->arg.seqid == NULL)
1326 goto out_free_calldata;
516a6af6
TM		 1327 calldata->arg.bitmask = server->attr_bitmask;
1328 calldata->res.fattr = &calldata->fattr;
1329 calldata->res.server = server;
4a35bd41
TM		 1330 calldata->path.mnt = mntget(path->mnt);
1331 calldata->path.dentry = dget(path->dentry);
9512135d 1332
b39e625b
TM		 1333 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1334 if (IS_ERR(task))
1335 return PTR_ERR(task);
1336 rpc_put_task(task);
1337 return 0;
9512135d
TM		 1338out_free_calldata:
1339 kfree(calldata);
1340out:
b39e625b
TM		 1341 nfs4_put_open_state(state);
1342 nfs4_put_state_owner(sp);
9512135d 1343 return status;
1da177e4
LT		 1344}
1345
4a35bd41 1346static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
02a913a7
TM		 1347{
1348 struct file *filp;
1b45c46c 1349 int ret;
02a913a7 1350
1b45c46c
TM		 1351 /* If the open_intent is for execute, we have an extra check to make */
1352 if (nd->intent.open.flags & FMODE_EXEC) {
af22f94a 1353 ret = nfs_may_open(state->inode,
1b45c46c
TM		 1354 state->owner->so_cred,
1355 nd->intent.open.flags);
1356 if (ret < 0)
1357 goto out_close;
1358 }
4a35bd41 1359 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
02a913a7
TM		 1360 if (!IS_ERR(filp)) {
1361 struct nfs_open_context *ctx;
cd3758e3 1362 ctx = nfs_file_open_context(filp);
02a913a7 1363 ctx->state = state;
95cf959b
TM		 1364 return 0;
1365 }
1b45c46c
TM		 1366 ret = PTR_ERR(filp);
1367out_close:
4a35bd41 1368 nfs4_close_state(path, state, nd->intent.open.flags);
1b45c46c 1369 return ret;
02a913a7
TM		 1370}
1371
1372struct dentry *
1da177e4
LT		 1373nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1374{
ad389da7
TM		 1375 struct path path = {
1376 .mnt = nd->mnt,
1377 .dentry = dentry,
1378 };
1da177e4
LT		 1379 struct iattr attr;
1380 struct rpc_cred *cred;
1381 struct nfs4_state *state;
02a913a7 1382 struct dentry *res;
1da177e4
LT		 1383
1384 if (nd->flags & LOOKUP_CREATE) {
1385 attr.ia_mode = nd->intent.open.create_mode;
1386 attr.ia_valid = ATTR_MODE;
1387 if (!IS_POSIXACL(dir))
1388 attr.ia_mode &= ~current->fs->umask;
1389 } else {
1390 attr.ia_valid = 0;
1391 BUG_ON(nd->intent.open.flags & O_CREAT);
1392 }
1393
1f163415 1394 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1395 if (IS_ERR(cred))
02a913a7 1396 return (struct dentry *)cred;
ad389da7 1397 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1398 put_rpccred(cred);
02a913a7 1399 if (IS_ERR(state)) {
d75340cc 1400 if (PTR_ERR(state) == -ENOENT) {
02a913a7 1401 d_add(dentry, NULL);
d75340cc
TM		 1402 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1403 }
02a913a7
TM		 1404 return (struct dentry *)state;
1405 }
24ac23ab 1406 res = d_add_unique(dentry, igrab(state->inode));
02a913a7 1407 if (res != NULL)
deee9369 1408 path.dentry = res;
d75340cc 1409 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
4a35bd41 1410 nfs4_intent_set_file(nd, &path, state);
02a913a7 1411 return res;
1da177e4
LT		 1412}
1413
1414int
02a913a7 1415nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1416{
ad389da7
TM		 1417 struct path path = {
1418 .mnt = nd->mnt,
1419 .dentry = dentry,
1420 };
1da177e4
LT		 1421 struct rpc_cred *cred;
1422 struct nfs4_state *state;
1da177e4 1423
1f163415 1424 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1425 if (IS_ERR(cred))
1426 return PTR_ERR(cred);
aac00a8d 1427 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1428 put_rpccred(cred);
02a913a7
TM		 1429 if (IS_ERR(state)) {
1430 switch (PTR_ERR(state)) {
1431 case -EPERM:
1432 case -EACCES:
1433 case -EDQUOT:
1434 case -ENOSPC:
1435 case -EROFS:
1436 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1437 return 1;
b87c0adf
CL		 1438 default:
1439 goto out_drop;
02a913a7 1440 }
02a913a7 1441 }
24ac23ab 1442 if (state->inode == dentry->d_inode) {
d75340cc 1443 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
4a35bd41 1444 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1445 return 1;
1446 }
4a35bd41 1447 nfs4_close_state(&path, state, openflags);
02a913a7
TM		 1448out_drop:
1449 d_drop(dentry);
1da177e4
LT		 1450 return 0;
1451}
1452
1453
1454static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1455{
1456 struct nfs4_server_caps_res res = {};
1457 struct rpc_message msg = {
1458 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1459 .rpc_argp = fhandle,
1460 .rpc_resp = &res,
1461 };
1462 int status;
1463
1464 status = rpc_call_sync(server->client, &msg, 0);
1465 if (status == 0) {
1466 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1467 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1468 server->caps |= NFS_CAP_ACLS;
1469 if (res.has_links != 0)
1470 server->caps |= NFS_CAP_HARDLINKS;
1471 if (res.has_symlinks != 0)
1472 server->caps |= NFS_CAP_SYMLINKS;
1473 server->acl_bitmask = res.acl_bitmask;
1474 }
1475 return status;
1476}
1477
55a97593 1478int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1479{
1480 struct nfs4_exception exception = { };
1481 int err;
1482 do {
1483 err = nfs4_handle_exception(server,
1484 _nfs4_server_capabilities(server, fhandle),
1485 &exception);
1486 } while (exception.retry);
1487 return err;
1488}
1489
1490static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1491 struct nfs_fsinfo *info)
1492{
1da177e4
LT		 1493 struct nfs4_lookup_root_arg args = {
1494 .bitmask = nfs4_fattr_bitmap,
1495 };
1496 struct nfs4_lookup_res res = {
1497 .server = server,
0e574af1 1498 .fattr = info->fattr,
1da177e4
LT		 1499 .fh = fhandle,
1500 };
1501 struct rpc_message msg = {
1502 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1503 .rpc_argp = &args,
1504 .rpc_resp = &res,
1505 };
0e574af1 1506 nfs_fattr_init(info->fattr);
1da177e4
LT		 1507 return rpc_call_sync(server->client, &msg, 0);
1508}
1509
1510static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1511 struct nfs_fsinfo *info)
1512{
1513 struct nfs4_exception exception = { };
1514 int err;
1515 do {
1516 err = nfs4_handle_exception(server,
1517 _nfs4_lookup_root(server, fhandle, info),
1518 &exception);
1519 } while (exception.retry);
1520 return err;
1521}
1522
54ceac45
DH		 1523/*
1524 * get the file handle for the "/" directory on the server
1525 */
1da177e4 1526static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1527 struct nfs_fsinfo *info)
1da177e4 1528{
1da177e4
LT		 1529 int status;
1530
1da177e4 1531 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1532 if (status == 0)
1533 status = nfs4_server_capabilities(server, fhandle);
1534 if (status == 0)
1535 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1536 return nfs4_map_errors(status);
1da177e4
LT		 1537}
1538
6b97fd3d
MN		 1539/*
1540 * Get locations and (maybe) other attributes of a referral.
1541 * Note that we'll actually follow the referral later when
1542 * we detect fsid mismatch in inode revalidation
1543 */
56659e99 1544static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
6b97fd3d
MN		 1545{
1546 int status = -ENOMEM;
1547 struct page *page = NULL;
1548 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1549
1550 page = alloc_page(GFP_KERNEL);
1551 if (page == NULL)
1552 goto out;
1553 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1554 if (locations == NULL)
1555 goto out;
1556
c228fd3a 1557 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1558 if (status != 0)
1559 goto out;
1560 /* Make sure server returned a different fsid for the referral */
1561 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1562 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1563 status = -EIO;
1564 goto out;
1565 }
1566
1567 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1568 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1569 if (!fattr->mode)
1570 fattr->mode = S_IFDIR;
1571 memset(fhandle, 0, sizeof(struct nfs_fh));
1572out:
1573 if (page)
1574 __free_page(page);
1575 if (locations)
1576 kfree(locations);
1577 return status;
1578}
1579
1da177e4
LT		 1580static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1581{
1582 struct nfs4_getattr_arg args = {
1583 .fh = fhandle,
1584 .bitmask = server->attr_bitmask,
1585 };
1586 struct nfs4_getattr_res res = {
1587 .fattr = fattr,
1588 .server = server,
1589 };
1590 struct rpc_message msg = {
1591 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1592 .rpc_argp = &args,
1593 .rpc_resp = &res,
1594 };
1595
0e574af1 1596 nfs_fattr_init(fattr);
1da177e4
LT		 1597 return rpc_call_sync(server->client, &msg, 0);
1598}
1599
1600static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1601{
1602 struct nfs4_exception exception = { };
1603 int err;
1604 do {
1605 err = nfs4_handle_exception(server,
1606 _nfs4_proc_getattr(server, fhandle, fattr),
1607 &exception);
1608 } while (exception.retry);
1609 return err;
1610}
1611
1612/*
1613 * The file is not closed if it is opened due to the a request to change
1614 * the size of the file. The open call will not be needed once the
1615 * VFS layer lookup-intents are implemented.
1616 *
1617 * Close is called when the inode is destroyed.
1618 * If we haven't opened the file for O_WRONLY, we
1619 * need to in the size_change case to obtain a stateid.
1620 *
1621 * Got race?
1622 * Because OPEN is always done by name in nfsv4, it is
1623 * possible that we opened a different file by the same
1624 * name. We can recognize this race condition, but we
1625 * can't do anything about it besides returning an error.
1626 *
1627 * This will be fixed with VFS changes (lookup-intent).
1628 */
1629static int
1630nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1631 struct iattr *sattr)
1632{
08e9eac4
TM		 1633 struct rpc_cred *cred;
1634 struct inode *inode = dentry->d_inode;
d530838b
TM		 1635 struct nfs_open_context *ctx;
1636 struct nfs4_state *state = NULL;
1da177e4
LT		 1637 int status;
1638
0e574af1 1639 nfs_fattr_init(fattr);
1da177e4 1640
1f163415 1641 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1642 if (IS_ERR(cred))
1643 return PTR_ERR(cred);
d530838b
TM		 1644
1645 /* Search for an existing open(O_WRITE) file */
1646 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1647 if (ctx != NULL)
1648 state = ctx->state;
08e9eac4 1649
3e4f6290 1650 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1651 if (status == 0)
1652 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1653 if (ctx != NULL)
1654 put_nfs_open_context(ctx);
08e9eac4 1655 put_rpccred(cred);
1da177e4
LT		 1656 return status;
1657}
1658
56659e99
TM		 1659static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1660 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1661 struct nfs_fattr *fattr)
1662{
1663 int status;
1664 struct nfs4_lookup_arg args = {
1665 .bitmask = server->attr_bitmask,
1666 .dir_fh = dirfh,
1667 .name = name,
1668 };
1669 struct nfs4_lookup_res res = {
1670 .server = server,
1671 .fattr = fattr,
1672 .fh = fhandle,
1673 };
1674 struct rpc_message msg = {
1675 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1676 .rpc_argp = &args,
1677 .rpc_resp = &res,
1678 };
1679
1680 nfs_fattr_init(fattr);
1681
1682 dprintk("NFS call lookupfh %s\n", name->name);
1683 status = rpc_call_sync(server->client, &msg, 0);
1684 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1685 return status;
1686}
1687
1688static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1689 struct qstr *name, struct nfs_fh *fhandle,
1690 struct nfs_fattr *fattr)
1691{
1692 struct nfs4_exception exception = { };
1693 int err;
1694 do {
4e56e082
TM		 1695 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1696 /* FIXME: !!!! */
1697 if (err == -NFS4ERR_MOVED) {
1698 err = -EREMOTE;
1699 break;
1700 }
1701 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1702 } while (exception.retry);
1703 return err;
1704}
1705
56659e99 1706static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1707 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1708{
4e56e082 1709 int status;
1da177e4
LT		 1710
1711 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1712 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1713 if (status == -NFS4ERR_MOVED)
1714 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1715 dprintk("NFS reply lookup: %d\n", status);
1716 return status;
1717}
1718
1719static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1720{
1721 struct nfs4_exception exception = { };
1722 int err;
1723 do {
1724 err = nfs4_handle_exception(NFS_SERVER(dir),
1725 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1726 &exception);
1727 } while (exception.retry);
1728 return err;
1729}
1730
1731static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1732{
76b32999
TM		 1733 struct nfs_server *server = NFS_SERVER(inode);
1734 struct nfs_fattr fattr;
1da177e4
LT		 1735 struct nfs4_accessargs args = {
1736 .fh = NFS_FH(inode),
76b32999
TM		 1737 .bitmask = server->attr_bitmask,
1738 };
1739 struct nfs4_accessres res = {
1740 .server = server,
1741 .fattr = &fattr,
1da177e4 1742 };
1da177e4
LT		 1743 struct rpc_message msg = {
1744 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1745 .rpc_argp = &args,
1746 .rpc_resp = &res,
1747 .rpc_cred = entry->cred,
1748 };
1749 int mode = entry->mask;
1750 int status;
1751
1752 /*
1753 * Determine which access bits we want to ask for...
1754 */
1755 if (mode & MAY_READ)
1756 args.access |= NFS4_ACCESS_READ;
1757 if (S_ISDIR(inode->i_mode)) {
1758 if (mode & MAY_WRITE)
1759 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1760 if (mode & MAY_EXEC)
1761 args.access |= NFS4_ACCESS_LOOKUP;
1762 } else {
1763 if (mode & MAY_WRITE)
1764 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1765 if (mode & MAY_EXEC)
1766 args.access |= NFS4_ACCESS_EXECUTE;
1767 }
76b32999 1768 nfs_fattr_init(&fattr);
1da177e4
LT		 1769 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1770 if (!status) {
1771 entry->mask = 0;
1772 if (res.access & NFS4_ACCESS_READ)
1773 entry->mask |= MAY_READ;
1774 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1775 entry->mask |= MAY_WRITE;
1776 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1777 entry->mask |= MAY_EXEC;
76b32999 1778 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1779 }
1780 return status;
1781}
1782
1783static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1784{
1785 struct nfs4_exception exception = { };
1786 int err;
1787 do {
1788 err = nfs4_handle_exception(NFS_SERVER(inode),
1789 _nfs4_proc_access(inode, entry),
1790 &exception);
1791 } while (exception.retry);
1792 return err;
1793}
1794
1795/*
1796 * TODO: For the time being, we don't try to get any attributes
1797 * along with any of the zero-copy operations READ, READDIR,
1798 * READLINK, WRITE.
1799 *
1800 * In the case of the first three, we want to put the GETATTR
1801 * after the read-type operation -- this is because it is hard
1802 * to predict the length of a GETATTR response in v4, and thus
1803 * align the READ data correctly. This means that the GETATTR
1804 * may end up partially falling into the page cache, and we should
1805 * shift it into the 'tail' of the xdr_buf before processing.
1806 * To do this efficiently, we need to know the total length
1807 * of data received, which doesn't seem to be available outside
1808 * of the RPC layer.
1809 *
1810 * In the case of WRITE, we also want to put the GETATTR after
1811 * the operation -- in this case because we want to make sure
1812 * we get the post-operation mtime and size. This means that
1813 * we can't use xdr_encode_pages() as written: we need a variant
1814 * of it which would leave room in the 'tail' iovec.
1815 *
1816 * Both of these changes to the XDR layer would in fact be quite
1817 * minor, but I decided to leave them for a subsequent patch.
1818 */
1819static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1820 unsigned int pgbase, unsigned int pglen)
1821{
1822 struct nfs4_readlink args = {
1823 .fh = NFS_FH(inode),
1824 .pgbase = pgbase,
1825 .pglen = pglen,
1826 .pages = &page,
1827 };
1828 struct rpc_message msg = {
1829 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1830 .rpc_argp = &args,
1831 .rpc_resp = NULL,
1832 };
1833
1834 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1835}
1836
1837static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1838 unsigned int pgbase, unsigned int pglen)
1839{
1840 struct nfs4_exception exception = { };
1841 int err;
1842 do {
1843 err = nfs4_handle_exception(NFS_SERVER(inode),
1844 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1845 &exception);
1846 } while (exception.retry);
1847 return err;
1848}
1849
1da177e4
LT		 1850/*
1851 * Got race?
1852 * We will need to arrange for the VFS layer to provide an atomic open.
1853 * Until then, this create/open method is prone to inefficiency and race
1854 * conditions due to the lookup, create, and open VFS calls from sys_open()
1855 * placed on the wire.
1856 *
1857 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1858 * The file will be opened again in the subsequent VFS open call
1859 * (nfs4_proc_file_open).
1860 *
1861 * The open for read will just hang around to be used by any process that
1862 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1863 */
1864
1865static int
1866nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1867 int flags, struct nameidata *nd)
1da177e4 1868{
ad389da7
TM		 1869 struct path path = {
1870 .mnt = nd->mnt,
1871 .dentry = dentry,
1872 };
1da177e4
LT		 1873 struct nfs4_state *state;
1874 struct rpc_cred *cred;
1875 int status = 0;
1876
1f163415 1877 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1878 if (IS_ERR(cred)) {
1879 status = PTR_ERR(cred);
1880 goto out;
1881 }
ad389da7 1882 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1da177e4 1883 put_rpccred(cred);
d4d9cdcb 1884 d_drop(dentry);
1da177e4
LT		 1885 if (IS_ERR(state)) {
1886 status = PTR_ERR(state);
1887 goto out;
1888 }
d4d9cdcb 1889 d_add(dentry, igrab(state->inode));
d75340cc 1890 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 1891 if (flags & O_EXCL) {
1892 struct nfs_fattr fattr;
3e4f6290 1893 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1894 if (status == 0)
65e4308d 1895 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1896 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1897 }
ad389da7 1898 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1899 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1900 else
4a35bd41 1901 nfs4_close_state(&path, state, flags);
1da177e4
LT		 1902out:
1903 return status;
1904}
1905
1906static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1907{
16e42959 1908 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 1909 struct nfs_removeargs args = {
1da177e4 1910 .fh = NFS_FH(dir),
4fdc17b2
TM		 1911 .name.len = name->len,
1912 .name.name = name->name,
16e42959
TM		 1913 .bitmask = server->attr_bitmask,
1914 };
4fdc17b2 1915 struct nfs_removeres res = {
16e42959 1916 .server = server,
1da177e4 1917 };
1da177e4 1918 struct rpc_message msg = {
4fdc17b2
TM		 1919 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1920 .rpc_argp = &args,
1921 .rpc_resp = &res,
1da177e4
LT		 1922 };
1923 int status;
1924
4fdc17b2 1925 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 1926 status = rpc_call_sync(server->client, &msg, 0);
1927 if (status == 0) {
1928 update_changeattr(dir, &res.cinfo);
4fdc17b2 1929 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 1930 }
1da177e4
LT		 1931 return status;
1932}
1933
1934static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1935{
1936 struct nfs4_exception exception = { };
1937 int err;
1938 do {
1939 err = nfs4_handle_exception(NFS_SERVER(dir),
1940 _nfs4_proc_remove(dir, name),
1941 &exception);
1942 } while (exception.retry);
1943 return err;
1944}
1945
e4eff1a6 1946static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 1947{
e4eff1a6
TM		 1948 struct nfs_server *server = NFS_SERVER(dir);
1949 struct nfs_removeargs *args = msg->rpc_argp;
1950 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 1951
e4eff1a6
TM		 1952 args->bitmask = server->attr_bitmask;
1953 res->server = server;
1da177e4 1954 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 1955}
1956
e4eff1a6 1957static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 1958{
e4eff1a6
TM		 1959 struct nfs_removeres *res = task->tk_msg.rpc_resp;
1960
1961 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1962 return 0;
1963 update_changeattr(dir, &res->cinfo);
1964 nfs_post_op_update_inode(dir, &res->dir_attr);
1965 return 1;
1da177e4
LT		 1966}
1967
1968static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1969 struct inode *new_dir, struct qstr *new_name)
1970{
6caf2c82 1971 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1972 struct nfs4_rename_arg arg = {
1973 .old_dir = NFS_FH(old_dir),
1974 .new_dir = NFS_FH(new_dir),
1975 .old_name = old_name,
1976 .new_name = new_name,
6caf2c82
TM		 1977 .bitmask = server->attr_bitmask,
1978 };
1979 struct nfs_fattr old_fattr, new_fattr;
1980 struct nfs4_rename_res res = {
1981 .server = server,
1982 .old_fattr = &old_fattr,
1983 .new_fattr = &new_fattr,
1da177e4 1984 };
1da177e4
LT		 1985 struct rpc_message msg = {
1986 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1987 .rpc_argp = &arg,
1988 .rpc_resp = &res,
1989 };
1990 int status;
1991
6caf2c82
TM		 1992 nfs_fattr_init(res.old_fattr);
1993 nfs_fattr_init(res.new_fattr);
1994 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 1995
1996 if (!status) {
1997 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 1998 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 1999 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2000 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2001 }
2002 return status;
2003}
2004
2005static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2006 struct inode *new_dir, struct qstr *new_name)
2007{
2008 struct nfs4_exception exception = { };
2009 int err;
2010 do {
2011 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2012 _nfs4_proc_rename(old_dir, old_name,
2013 new_dir, new_name),
2014 &exception);
2015 } while (exception.retry);
2016 return err;
2017}
2018
2019static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2020{
91ba2eee 2021 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2022 struct nfs4_link_arg arg = {
2023 .fh = NFS_FH(inode),
2024 .dir_fh = NFS_FH(dir),
2025 .name = name,
91ba2eee
TM		 2026 .bitmask = server->attr_bitmask,
2027 };
2028 struct nfs_fattr fattr, dir_attr;
2029 struct nfs4_link_res res = {
2030 .server = server,
2031 .fattr = &fattr,
2032 .dir_attr = &dir_attr,
1da177e4 2033 };
1da177e4
LT		 2034 struct rpc_message msg = {
2035 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2036 .rpc_argp = &arg,
91ba2eee 2037 .rpc_resp = &res,
1da177e4
LT		 2038 };
2039 int status;
2040
91ba2eee
TM		 2041 nfs_fattr_init(res.fattr);
2042 nfs_fattr_init(res.dir_attr);
2043 status = rpc_call_sync(server->client, &msg, 0);
2044 if (!status) {
2045 update_changeattr(dir, &res.cinfo);
2046 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2047 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2048 }
1da177e4
LT		 2049
2050 return status;
2051}
2052
2053static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2054{
2055 struct nfs4_exception exception = { };
2056 int err;
2057 do {
2058 err = nfs4_handle_exception(NFS_SERVER(inode),
2059 _nfs4_proc_link(inode, dir, name),
2060 &exception);
2061 } while (exception.retry);
2062 return err;
2063}
2064
4f390c15 2065static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2066 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2067{
2068 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 2069 struct nfs_fh fhandle;
2070 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2071 struct nfs4_create_arg arg = {
2072 .dir_fh = NFS_FH(dir),
2073 .server = server,
4f390c15 2074 .name = &dentry->d_name,
1da177e4
LT		 2075 .attrs = sattr,
2076 .ftype = NF4LNK,
2077 .bitmask = server->attr_bitmask,
2078 };
2079 struct nfs4_create_res res = {
2080 .server = server,
4f390c15
CL		 2081 .fh = &fhandle,
2082 .fattr = &fattr,
56ae19f3 2083 .dir_fattr = &dir_fattr,
1da177e4
LT		 2084 };
2085 struct rpc_message msg = {
2086 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2087 .rpc_argp = &arg,
2088 .rpc_resp = &res,
2089 };
2090 int status;
2091
94a6d753 2092 if (len > NFS4_MAXPATHLEN)
1da177e4 2093 return -ENAMETOOLONG;
4f390c15 2094
94a6d753
CL		 2095 arg.u.symlink.pages = &page;
2096 arg.u.symlink.len = len;
4f390c15 2097 nfs_fattr_init(&fattr);
56ae19f3 2098 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2099
2100 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2101 if (!status) {
1da177e4 2102 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2103 nfs_post_op_update_inode(dir, res.dir_fattr);
2104 status = nfs_instantiate(dentry, &fhandle, &fattr);
2105 }
1da177e4
LT		 2106 return status;
2107}
2108
4f390c15 2109static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2110 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2111{
2112 struct nfs4_exception exception = { };
2113 int err;
2114 do {
2115 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2116 _nfs4_proc_symlink(dir, dentry, page,
2117 len, sattr),
1da177e4
LT		 2118 &exception);
2119 } while (exception.retry);
2120 return err;
2121}
2122
2123static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2124 struct iattr *sattr)
2125{
2126 struct nfs_server *server = NFS_SERVER(dir);
2127 struct nfs_fh fhandle;
56ae19f3 2128 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2129 struct nfs4_create_arg arg = {
2130 .dir_fh = NFS_FH(dir),
2131 .server = server,
2132 .name = &dentry->d_name,
2133 .attrs = sattr,
2134 .ftype = NF4DIR,
2135 .bitmask = server->attr_bitmask,
2136 };
2137 struct nfs4_create_res res = {
2138 .server = server,
2139 .fh = &fhandle,
2140 .fattr = &fattr,
56ae19f3 2141 .dir_fattr = &dir_fattr,
1da177e4
LT		 2142 };
2143 struct rpc_message msg = {
2144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2145 .rpc_argp = &arg,
2146 .rpc_resp = &res,
2147 };
2148 int status;
2149
0e574af1 2150 nfs_fattr_init(&fattr);
56ae19f3 2151 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2152
2153 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2154 if (!status) {
2155 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2156 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2157 status = nfs_instantiate(dentry, &fhandle, &fattr);
2158 }
2159 return status;
2160}
2161
2162static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2163 struct iattr *sattr)
2164{
2165 struct nfs4_exception exception = { };
2166 int err;
2167 do {
2168 err = nfs4_handle_exception(NFS_SERVER(dir),
2169 _nfs4_proc_mkdir(dir, dentry, sattr),
2170 &exception);
2171 } while (exception.retry);
2172 return err;
2173}
2174
2175static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2176 u64 cookie, struct page *page, unsigned int count, int plus)
2177{
2178 struct inode *dir = dentry->d_inode;
2179 struct nfs4_readdir_arg args = {
2180 .fh = NFS_FH(dir),
2181 .pages = &page,
2182 .pgbase = 0,
2183 .count = count,
2184 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2185 };
2186 struct nfs4_readdir_res res;
2187 struct rpc_message msg = {
2188 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2189 .rpc_argp = &args,
2190 .rpc_resp = &res,
2191 .rpc_cred = cred,
2192 };
2193 int status;
2194
eadf4598
TM		 2195 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2196 dentry->d_parent->d_name.name,
2197 dentry->d_name.name,
2198 (unsigned long long)cookie);
1da177e4
LT		 2199 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2200 res.pgbase = args.pgbase;
2201 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2202 if (status == 0)
2203 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2204
2205 nfs_invalidate_atime(dir);
2206
eadf4598 2207 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2208 return status;
2209}
2210
2211static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2212 u64 cookie, struct page *page, unsigned int count, int plus)
2213{
2214 struct nfs4_exception exception = { };
2215 int err;
2216 do {
2217 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2218 _nfs4_proc_readdir(dentry, cred, cookie,
2219 page, count, plus),
2220 &exception);
2221 } while (exception.retry);
2222 return err;
2223}
2224
2225static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2226 struct iattr *sattr, dev_t rdev)
2227{
2228 struct nfs_server *server = NFS_SERVER(dir);
2229 struct nfs_fh fh;
56ae19f3 2230 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2231 struct nfs4_create_arg arg = {
2232 .dir_fh = NFS_FH(dir),
2233 .server = server,
2234 .name = &dentry->d_name,
2235 .attrs = sattr,
2236 .bitmask = server->attr_bitmask,
2237 };
2238 struct nfs4_create_res res = {
2239 .server = server,
2240 .fh = &fh,
2241 .fattr = &fattr,
56ae19f3 2242 .dir_fattr = &dir_fattr,
1da177e4
LT		 2243 };
2244 struct rpc_message msg = {
2245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2246 .rpc_argp = &arg,
2247 .rpc_resp = &res,
2248 };
2249 int status;
2250 int mode = sattr->ia_mode;
2251
0e574af1 2252 nfs_fattr_init(&fattr);
56ae19f3 2253 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2254
2255 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2256 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2257 if (S_ISFIFO(mode))
2258 arg.ftype = NF4FIFO;
2259 else if (S_ISBLK(mode)) {
2260 arg.ftype = NF4BLK;
2261 arg.u.device.specdata1 = MAJOR(rdev);
2262 arg.u.device.specdata2 = MINOR(rdev);
2263 }
2264 else if (S_ISCHR(mode)) {
2265 arg.ftype = NF4CHR;
2266 arg.u.device.specdata1 = MAJOR(rdev);
2267 arg.u.device.specdata2 = MINOR(rdev);
2268 }
2269 else
2270 arg.ftype = NF4SOCK;
2271
2272 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2273 if (status == 0) {
2274 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2275 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2276 status = nfs_instantiate(dentry, &fh, &fattr);
2277 }
2278 return status;
2279}
2280
2281static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2282 struct iattr *sattr, dev_t rdev)
2283{
2284 struct nfs4_exception exception = { };
2285 int err;
2286 do {
2287 err = nfs4_handle_exception(NFS_SERVER(dir),
2288 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2289 &exception);
2290 } while (exception.retry);
2291 return err;
2292}
2293
2294static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2295 struct nfs_fsstat *fsstat)
2296{
2297 struct nfs4_statfs_arg args = {
2298 .fh = fhandle,
2299 .bitmask = server->attr_bitmask,
2300 };
2301 struct rpc_message msg = {
2302 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2303 .rpc_argp = &args,
2304 .rpc_resp = fsstat,
2305 };
2306
0e574af1 2307 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2308 return rpc_call_sync(server->client, &msg, 0);
2309}
2310
2311static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2312{
2313 struct nfs4_exception exception = { };
2314 int err;
2315 do {
2316 err = nfs4_handle_exception(server,
2317 _nfs4_proc_statfs(server, fhandle, fsstat),
2318 &exception);
2319 } while (exception.retry);
2320 return err;
2321}
2322
2323static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2324 struct nfs_fsinfo *fsinfo)
2325{
2326 struct nfs4_fsinfo_arg args = {
2327 .fh = fhandle,
2328 .bitmask = server->attr_bitmask,
2329 };
2330 struct rpc_message msg = {
2331 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2332 .rpc_argp = &args,
2333 .rpc_resp = fsinfo,
2334 };
2335
2336 return rpc_call_sync(server->client, &msg, 0);
2337}
2338
2339static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2340{
2341 struct nfs4_exception exception = { };
2342 int err;
2343
2344 do {
2345 err = nfs4_handle_exception(server,
2346 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2347 &exception);
2348 } while (exception.retry);
2349 return err;
2350}
2351
2352static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2353{
0e574af1 2354 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2355 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2356}
2357
2358static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2359 struct nfs_pathconf *pathconf)
2360{
2361 struct nfs4_pathconf_arg args = {
2362 .fh = fhandle,
2363 .bitmask = server->attr_bitmask,
2364 };
2365 struct rpc_message msg = {
2366 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2367 .rpc_argp = &args,
2368 .rpc_resp = pathconf,
2369 };
2370
2371 /* None of the pathconf attributes are mandatory to implement */
2372 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2373 memset(pathconf, 0, sizeof(*pathconf));
2374 return 0;
2375 }
2376
0e574af1 2377 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2378 return rpc_call_sync(server->client, &msg, 0);
2379}
2380
2381static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2382 struct nfs_pathconf *pathconf)
2383{
2384 struct nfs4_exception exception = { };
2385 int err;
2386
2387 do {
2388 err = nfs4_handle_exception(server,
2389 _nfs4_proc_pathconf(server, fhandle, pathconf),
2390 &exception);
2391 } while (exception.retry);
2392 return err;
2393}
2394
ec06c096 2395static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2396{
ec06c096 2397 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2398
ec06c096 2399 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2400 rpc_restart_call(task);
ec06c096 2401 return -EAGAIN;
1da177e4 2402 }
8850df99
TM		 2403
2404 nfs_invalidate_atime(data->inode);
1da177e4 2405 if (task->tk_status > 0)
ec06c096
TM		 2406 renew_lease(server, data->timestamp);
2407 return 0;
1da177e4
LT		 2408}
2409
ec06c096 2410static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2411{
1da177e4
LT		 2412 struct rpc_message msg = {
2413 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2414 .rpc_argp = &data->args,
2415 .rpc_resp = &data->res,
2416 .rpc_cred = data->cred,
2417 };
1da177e4
LT		 2418
2419 data->timestamp = jiffies;
2420
ec06c096 2421 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2422}
2423
788e7a89 2424static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2425{
1da177e4
LT		 2426 struct inode *inode = data->inode;
2427
2428 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2429 rpc_restart_call(task);
788e7a89 2430 return -EAGAIN;
1da177e4 2431 }
4f9838c7 2432 if (task->tk_status >= 0) {
1da177e4 2433 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2434 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2435 }
788e7a89 2436 return 0;
1da177e4
LT		 2437}
2438
788e7a89 2439static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2440{
1da177e4
LT		 2441 struct rpc_message msg = {
2442 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2443 .rpc_argp = &data->args,
2444 .rpc_resp = &data->res,
2445 .rpc_cred = data->cred,
2446 };
2447 struct inode *inode = data->inode;
4f9838c7 2448 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2449 int stable;
1da177e4
LT		 2450
2451 if (how & FLUSH_STABLE) {
2452 if (!NFS_I(inode)->ncommit)
2453 stable = NFS_FILE_SYNC;
2454 else
2455 stable = NFS_DATA_SYNC;
2456 } else
2457 stable = NFS_UNSTABLE;
2458 data->args.stable = stable;
4f9838c7
TM		 2459 data->args.bitmask = server->attr_bitmask;
2460 data->res.server = server;
1da177e4
LT		 2461
2462 data->timestamp = jiffies;
2463
1da177e4 2464 /* Finalize the task. */
788e7a89 2465 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2466}
2467
788e7a89 2468static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2469{
1da177e4
LT		 2470 struct inode *inode = data->inode;
2471
2472 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2473 rpc_restart_call(task);
788e7a89 2474 return -EAGAIN;
1da177e4 2475 }
9e08a3c5 2476 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2477 return 0;
1da177e4
LT		 2478}
2479
788e7a89 2480static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2481{
1da177e4
LT		 2482 struct rpc_message msg = {
2483 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2484 .rpc_argp = &data->args,
2485 .rpc_resp = &data->res,
2486 .rpc_cred = data->cred,
2487 };
788e7a89 2488 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2489
4f9838c7
TM		 2490 data->args.bitmask = server->attr_bitmask;
2491 data->res.server = server;
2492
788e7a89 2493 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2494}
2495
2496/*
2497 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2498 * standalone procedure for queueing an asynchronous RENEW.
2499 */
963d8fe5 2500static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2501{
adfa6f98 2502 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2503 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2504
2505 if (task->tk_status < 0) {
2506 switch (task->tk_status) {
2507 case -NFS4ERR_STALE_CLIENTID:
2508 case -NFS4ERR_EXPIRED:
2509 case -NFS4ERR_CB_PATH_DOWN:
2510 nfs4_schedule_state_recovery(clp);
2511 }
2512 return;
2513 }
2514 spin_lock(&clp->cl_lock);
2515 if (time_before(clp->cl_last_renewal,timestamp))
2516 clp->cl_last_renewal = timestamp;
2517 spin_unlock(&clp->cl_lock);
2518}
2519
963d8fe5
TM		 2520static const struct rpc_call_ops nfs4_renew_ops = {
2521 .rpc_call_done = nfs4_renew_done,
2522};
2523
adfa6f98 2524int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2525{
2526 struct rpc_message msg = {
2527 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2528 .rpc_argp = clp,
b4454fe1 2529 .rpc_cred = cred,
1da177e4
LT		 2530 };
2531
2532 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2533 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2534}
2535
adfa6f98 2536int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2537{
2538 struct rpc_message msg = {
2539 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2540 .rpc_argp = clp,
b4454fe1 2541 .rpc_cred = cred,
1da177e4
LT		 2542 };
2543 unsigned long now = jiffies;
2544 int status;
2545
2546 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2547 if (status < 0)
2548 return status;
2549 spin_lock(&clp->cl_lock);
2550 if (time_before(clp->cl_last_renewal,now))
2551 clp->cl_last_renewal = now;
2552 spin_unlock(&clp->cl_lock);
2553 return 0;
2554}
2555
aa1870af
BF		 2556static inline int nfs4_server_supports_acls(struct nfs_server *server)
2557{
2558 return (server->caps & NFS_CAP_ACLS)
2559 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2560 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2561}
2562
2563/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2564 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2565 * the stack.
2566 */
2567#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2568
2569static void buf_to_pages(const void *buf, size_t buflen,
2570 struct page **pages, unsigned int *pgbase)
2571{
2572 const void *p = buf;
2573
2574 *pgbase = offset_in_page(buf);
2575 p -= *pgbase;
2576 while (p < buf + buflen) {
2577 *(pages++) = virt_to_page(p);
2578 p += PAGE_CACHE_SIZE;
2579 }
2580}
2581
e50a1c2e
BF		 2582struct nfs4_cached_acl {
2583 int cached;
2584 size_t len;
3e9d4154 2585 char data[0];
e50a1c2e
BF		 2586};
2587
2588static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2589{
2590 struct nfs_inode *nfsi = NFS_I(inode);
2591
2592 spin_lock(&inode->i_lock);
2593 kfree(nfsi->nfs4_acl);
2594 nfsi->nfs4_acl = acl;
2595 spin_unlock(&inode->i_lock);
2596}
2597
2598static void nfs4_zap_acl_attr(struct inode *inode)
2599{
2600 nfs4_set_cached_acl(inode, NULL);
2601}
2602
2603static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2604{
2605 struct nfs_inode *nfsi = NFS_I(inode);
2606 struct nfs4_cached_acl *acl;
2607 int ret = -ENOENT;
2608
2609 spin_lock(&inode->i_lock);
2610 acl = nfsi->nfs4_acl;
2611 if (acl == NULL)
2612 goto out;
2613 if (buf == NULL) /* user is just asking for length */
2614 goto out_len;
2615 if (acl->cached == 0)
2616 goto out;
2617 ret = -ERANGE; /* see getxattr(2) man page */
2618 if (acl->len > buflen)
2619 goto out;
2620 memcpy(buf, acl->data, acl->len);
2621out_len:
2622 ret = acl->len;
2623out:
2624 spin_unlock(&inode->i_lock);
2625 return ret;
2626}
2627
2628static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2629{
2630 struct nfs4_cached_acl *acl;
2631
2632 if (buf && acl_len <= PAGE_SIZE) {
2633 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2634 if (acl == NULL)
2635 goto out;
2636 acl->cached = 1;
2637 memcpy(acl->data, buf, acl_len);
2638 } else {
2639 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2640 if (acl == NULL)
2641 goto out;
2642 acl->cached = 0;
2643 }
2644 acl->len = acl_len;
2645out:
2646 nfs4_set_cached_acl(inode, acl);
2647}
2648
16b4289c 2649static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2650{
aa1870af
BF		 2651 struct page *pages[NFS4ACL_MAXPAGES];
2652 struct nfs_getaclargs args = {
2653 .fh = NFS_FH(inode),
2654 .acl_pages = pages,
2655 .acl_len = buflen,
2656 };
2657 size_t resp_len = buflen;
e50a1c2e 2658 void *resp_buf;
aa1870af
BF		 2659 struct rpc_message msg = {
2660 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2661 .rpc_argp = &args,
2662 .rpc_resp = &resp_len,
2663 };
e50a1c2e 2664 struct page *localpage = NULL;
aa1870af
BF		 2665 int ret;
2666
e50a1c2e
BF		 2667 if (buflen < PAGE_SIZE) {
2668 /* As long as we're doing a round trip to the server anyway,
2669 * let's be prepared for a page of acl data. */
2670 localpage = alloc_page(GFP_KERNEL);
2671 resp_buf = page_address(localpage);
2672 if (localpage == NULL)
2673 return -ENOMEM;
2674 args.acl_pages[0] = localpage;
2675 args.acl_pgbase = 0;
1d95db8e 2676 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2677 } else {
2678 resp_buf = buf;
2679 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2680 }
aa1870af 2681 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2682 if (ret)
2683 goto out_free;
2684 if (resp_len > args.acl_len)
2685 nfs4_write_cached_acl(inode, NULL, resp_len);
2686 else
2687 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2688 if (buf) {
2689 ret = -ERANGE;
2690 if (resp_len > buflen)
2691 goto out_free;
2692 if (localpage)
2693 memcpy(buf, resp_buf, resp_len);
2694 }
2695 ret = resp_len;
2696out_free:
2697 if (localpage)
2698 __free_page(localpage);
aa1870af
BF		 2699 return ret;
2700}
2701
16b4289c
TM		 2702static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2703{
2704 struct nfs4_exception exception = { };
2705 ssize_t ret;
2706 do {
2707 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2708 if (ret >= 0)
2709 break;
2710 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2711 } while (exception.retry);
2712 return ret;
2713}
2714
e50a1c2e
BF		 2715static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2716{
2717 struct nfs_server *server = NFS_SERVER(inode);
2718 int ret;
2719
2720 if (!nfs4_server_supports_acls(server))
2721 return -EOPNOTSUPP;
2722 ret = nfs_revalidate_inode(server, inode);
2723 if (ret < 0)
2724 return ret;
2725 ret = nfs4_read_cached_acl(inode, buf, buflen);
2726 if (ret != -ENOENT)
2727 return ret;
2728 return nfs4_get_acl_uncached(inode, buf, buflen);
2729}
2730
16b4289c 2731static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2732{
2733 struct nfs_server *server = NFS_SERVER(inode);
2734 struct page *pages[NFS4ACL_MAXPAGES];
2735 struct nfs_setaclargs arg = {
2736 .fh = NFS_FH(inode),
2737 .acl_pages = pages,
2738 .acl_len = buflen,
2739 };
2740 struct rpc_message msg = {
2741 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2742 .rpc_argp = &arg,
2743 .rpc_resp = NULL,
2744 };
2745 int ret;
2746
2747 if (!nfs4_server_supports_acls(server))
2748 return -EOPNOTSUPP;
642ac549 2749 nfs_inode_return_delegation(inode);
4b580ee3 2750 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2751 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
08efa202 2752 nfs_zap_caches(inode);
4b580ee3
BF		 2753 return ret;
2754}
2755
16b4289c
TM		 2756static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2757{
2758 struct nfs4_exception exception = { };
2759 int err;
2760 do {
2761 err = nfs4_handle_exception(NFS_SERVER(inode),
2762 __nfs4_proc_set_acl(inode, buf, buflen),
2763 &exception);
2764 } while (exception.retry);
2765 return err;
2766}
2767
1da177e4 2768static int
faf5f49c 2769nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2770{
7539bbab 2771 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2772
2773 if (!clp || task->tk_status >= 0)
2774 return 0;
2775 switch(task->tk_status) {
2776 case -NFS4ERR_STALE_CLIENTID:
2777 case -NFS4ERR_STALE_STATEID:
2778 case -NFS4ERR_EXPIRED:
2779 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2780 nfs4_schedule_state_recovery(clp);
433fbe4c 2781 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2782 rpc_wake_up_task(task);
2783 task->tk_status = 0;
2784 return -EAGAIN;
1da177e4 2785 case -NFS4ERR_DELAY:
006ea73e
CL		 2786 nfs_inc_server_stats((struct nfs_server *) server,
2787 NFSIOS_DELAY);
2788 case -NFS4ERR_GRACE:
1da177e4
LT		 2789 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2790 task->tk_status = 0;
2791 return -EAGAIN;
2792 case -NFS4ERR_OLD_STATEID:
2793 task->tk_status = 0;
2794 return -EAGAIN;
2795 }
2796 task->tk_status = nfs4_map_errors(task->tk_status);
2797 return 0;
2798}
2799
433fbe4c
TM		 2800static int nfs4_wait_bit_interruptible(void *word)
2801{
2802 if (signal_pending(current))
2803 return -ERESTARTSYS;
2804 schedule();
2805 return 0;
2806}
2807
adfa6f98 2808static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2809{
1da177e4 2810 sigset_t oldset;
433fbe4c 2811 int res;
1da177e4
LT		 2812
2813 might_sleep();
2814
e148582e
TM		 2815 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2816
1da177e4 2817 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2818 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2819 nfs4_wait_bit_interruptible,
2820 TASK_INTERRUPTIBLE);
1da177e4 2821 rpc_clnt_sigunmask(clnt, &oldset);
e148582e
TM		 2822
2823 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2824 return res;
2825}
2826
2827static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2828{
2829 sigset_t oldset;
2830 int res = 0;
2831
2832 might_sleep();
2833
2834 if (*timeout <= 0)
2835 *timeout = NFS4_POLL_RETRY_MIN;
2836 if (*timeout > NFS4_POLL_RETRY_MAX)
2837 *timeout = NFS4_POLL_RETRY_MAX;
2838 rpc_clnt_sigmask(clnt, &oldset);
2839 if (clnt->cl_intr) {
041e0e3b 2840 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2841 if (signalled())
2842 res = -ERESTARTSYS;
041e0e3b
NA		 2843 } else
2844 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2845 rpc_clnt_sigunmask(clnt, &oldset);
2846 *timeout <<= 1;
2847 return res;
2848}
2849
2850/* This is the error handling routine for processes that are allowed
2851 * to sleep.
2852 */
10afec90 2853static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2854{
7539bbab 2855 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2856 int ret = errorcode;
2857
2858 exception->retry = 0;
2859 switch(errorcode) {
2860 case 0:
2861 return 0;
2862 case -NFS4ERR_STALE_CLIENTID:
2863 case -NFS4ERR_STALE_STATEID:
2864 case -NFS4ERR_EXPIRED:
433fbe4c 2865 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2866 ret = nfs4_wait_clnt_recover(server->client, clp);
2867 if (ret == 0)
2868 exception->retry = 1;
2869 break;
c514983d 2870 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2871 case -NFS4ERR_GRACE:
2872 case -NFS4ERR_DELAY:
2873 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2874 if (ret != 0)
2875 break;
1da177e4 2876 case -NFS4ERR_OLD_STATEID:
2c56617d 2877 exception->retry = 1;
1da177e4
LT		 2878 }
2879 /* We failed to handle the error */
2880 return nfs4_map_errors(ret);
2881}
2882
adfa6f98 2883int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2884{
2885 nfs4_verifier sc_verifier;
2886 struct nfs4_setclientid setclientid = {
2887 .sc_verifier = &sc_verifier,
2888 .sc_prog = program,
2889 };
2890 struct rpc_message msg = {
2891 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2892 .rpc_argp = &setclientid,
2893 .rpc_resp = clp,
286d7d6a 2894 .rpc_cred = cred,
1da177e4 2895 };
bc4785cd 2896 __be32 *p;
1da177e4
LT		 2897 int loop = 0;
2898 int status;
2899
bc4785cd 2900 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2901 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2902 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2903
2904 for(;;) {
2905 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2906 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2907 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2908 cred->cr_ops->cr_name,
1da177e4
LT		 2909 clp->cl_id_uniquifier);
2910 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2911 sizeof(setclientid.sc_netid), "tcp");
2912 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2913 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2914 clp->cl_ipaddr, port >> 8, port & 255);
2915
2916 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2917 if (status != -NFS4ERR_CLID_INUSE)
2918 break;
2919 if (signalled())
2920 break;
2921 if (loop++ & 1)
2922 ssleep(clp->cl_lease_time + 1);
2923 else
2924 if (++clp->cl_id_uniquifier == 0)
2925 break;
2926 }
2927 return status;
2928}
2929
adfa6f98 2930static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2931{
2932 struct nfs_fsinfo fsinfo;
2933 struct rpc_message msg = {
2934 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2935 .rpc_argp = clp,
2936 .rpc_resp = &fsinfo,
286d7d6a 2937 .rpc_cred = cred,
1da177e4
LT		 2938 };
2939 unsigned long now;
2940 int status;
2941
2942 now = jiffies;
2943 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2944 if (status == 0) {
2945 spin_lock(&clp->cl_lock);
2946 clp->cl_lease_time = fsinfo.lease_time * HZ;
2947 clp->cl_last_renewal = now;
58d9714a 2948 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2949 spin_unlock(&clp->cl_lock);
2950 }
2951 return status;
2952}
2953
adfa6f98 2954int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2955{
2956 long timeout;
2957 int err;
2958 do {
2959 err = _nfs4_proc_setclientid_confirm(clp, cred);
2960 switch (err) {
2961 case 0:
2962 return err;
2963 case -NFS4ERR_RESOURCE:
2964 /* The IBM lawyers misread another document! */
2965 case -NFS4ERR_DELAY:
2966 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2967 }
2968 } while (err == 0);
2969 return err;
2970}
2971
fe650407
TM		 2972struct nfs4_delegreturndata {
2973 struct nfs4_delegreturnargs args;
fa178f29 2974 struct nfs4_delegreturnres res;
fe650407
TM		 2975 struct nfs_fh fh;
2976 nfs4_stateid stateid;
2977 struct rpc_cred *cred;
26e976a8 2978 unsigned long timestamp;
fa178f29 2979 struct nfs_fattr fattr;
fe650407
TM		 2980 int rpc_status;
2981};
2982
2983static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 2984{
fe650407 2985 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 2986 struct rpc_message msg = {
2987 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 2988 .rpc_argp = &data->args,
fa178f29 2989 .rpc_resp = &data->res,
fe650407 2990 .rpc_cred = data->cred,
1da177e4 2991 };
fa178f29 2992 nfs_fattr_init(data->res.fattr);
fe650407
TM		 2993 rpc_call_setup(task, &msg, 0);
2994}
1da177e4 2995
fe650407
TM		 2996static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2997{
2998 struct nfs4_delegreturndata *data = calldata;
2999 data->rpc_status = task->tk_status;
26e976a8 3000 if (data->rpc_status == 0)
fa178f29 3001 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 3002}
3003
3004static void nfs4_delegreturn_release(void *calldata)
3005{
3006 struct nfs4_delegreturndata *data = calldata;
3007
3008 put_rpccred(data->cred);
3009 kfree(calldata);
3010}
3011
c8d149f3 3012static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 3013 .rpc_call_prepare = nfs4_delegreturn_prepare,
3014 .rpc_call_done = nfs4_delegreturn_done,
3015 .rpc_release = nfs4_delegreturn_release,
3016};
3017
3018static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3019{
3020 struct nfs4_delegreturndata *data;
fa178f29 3021 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 3022 struct rpc_task *task;
3023 int status;
3024
3025 data = kmalloc(sizeof(*data), GFP_KERNEL);
3026 if (data == NULL)
3027 return -ENOMEM;
3028 data->args.fhandle = &data->fh;
3029 data->args.stateid = &data->stateid;
fa178f29 3030 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3031 nfs_copy_fh(&data->fh, NFS_FH(inode));
3032 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3033 data->res.fattr = &data->fattr;
3034 data->res.server = server;
fe650407 3035 data->cred = get_rpccred(cred);
26e976a8 3036 data->timestamp = jiffies;
fe650407
TM		 3037 data->rpc_status = 0;
3038
3039 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 3040 if (IS_ERR(task))
fe650407 3041 return PTR_ERR(task);
fe650407 3042 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 3043 if (status == 0) {
fe650407 3044 status = data->rpc_status;
fa178f29 3045 if (status == 0)
9e08a3c5 3046 nfs_refresh_inode(inode, &data->fattr);
fa178f29 3047 }
e6b3c4db 3048 rpc_put_task(task);
fe650407 3049 return status;
1da177e4
LT		 3050}
3051
3052int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3053{
3054 struct nfs_server *server = NFS_SERVER(inode);
3055 struct nfs4_exception exception = { };
3056 int err;
3057 do {
3058 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3059 switch (err) {
3060 case -NFS4ERR_STALE_STATEID:
3061 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3062 case 0:
3063 return 0;
3064 }
3065 err = nfs4_handle_exception(server, err, &exception);
3066 } while (exception.retry);
3067 return err;
3068}
3069
3070#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3071#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3072
3073/*
3074 * sleep, with exponential backoff, and retry the LOCK operation.
3075 */
3076static unsigned long
3077nfs4_set_lock_task_retry(unsigned long timeout)
3078{
041e0e3b 3079 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3080 timeout <<= 1;
3081 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3082 return NFS4_LOCK_MAXTIMEOUT;
3083 return timeout;
3084}
3085
1da177e4
LT		 3086static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3087{
3088 struct inode *inode = state->inode;
3089 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3090 struct nfs_client *clp = server->nfs_client;
911d1aaf 3091 struct nfs_lockt_args arg = {
1da177e4 3092 .fh = NFS_FH(inode),
911d1aaf 3093 .fl = request,
1da177e4 3094 };
911d1aaf
TM		 3095 struct nfs_lockt_res res = {
3096 .denied = request,
1da177e4
LT		 3097 };
3098 struct rpc_message msg = {
3099 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3100 .rpc_argp = &arg,
3101 .rpc_resp = &res,
3102 .rpc_cred = state->owner->so_cred,
3103 };
1da177e4
LT		 3104 struct nfs4_lock_state *lsp;
3105 int status;
3106
3107 down_read(&clp->cl_sem);
911d1aaf 3108 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3109 status = nfs4_set_lock_state(state, request);
3110 if (status != 0)
3111 goto out;
3112 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3113 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3114 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3115 switch (status) {
3116 case 0:
3117 request->fl_type = F_UNLCK;
3118 break;
3119 case -NFS4ERR_DENIED:
3120 status = 0;
1da177e4 3121 }
70cc6487 3122 request->fl_ops->fl_release_private(request);
8d0a8a9d 3123out:
1da177e4
LT		 3124 up_read(&clp->cl_sem);
3125 return status;
3126}
3127
3128static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3129{
3130 struct nfs4_exception exception = { };
3131 int err;
3132
3133 do {
3134 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3135 _nfs4_proc_getlk(state, cmd, request),
3136 &exception);
3137 } while (exception.retry);
3138 return err;
3139}
3140
3141static int do_vfs_lock(struct file *file, struct file_lock *fl)
3142{
3143 int res = 0;
3144 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3145 case FL_POSIX:
3146 res = posix_lock_file_wait(file, fl);
3147 break;
3148 case FL_FLOCK:
3149 res = flock_lock_file_wait(file, fl);
3150 break;
3151 default:
3152 BUG();
3153 }
1da177e4
LT		 3154 return res;
3155}
3156
faf5f49c 3157struct nfs4_unlockdata {
911d1aaf
TM		 3158 struct nfs_locku_args arg;
3159 struct nfs_locku_res res;
faf5f49c
TM		 3160 struct nfs4_lock_state *lsp;
3161 struct nfs_open_context *ctx;
911d1aaf
TM		 3162 struct file_lock fl;
3163 const struct nfs_server *server;
26e976a8 3164 unsigned long timestamp;
faf5f49c
TM		 3165};
3166
911d1aaf
TM		 3167static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3168 struct nfs_open_context *ctx,
3169 struct nfs4_lock_state *lsp,
3170 struct nfs_seqid *seqid)
3171{
3172 struct nfs4_unlockdata *p;
3173 struct inode *inode = lsp->ls_state->inode;
3174
3175 p = kmalloc(sizeof(*p), GFP_KERNEL);
3176 if (p == NULL)
3177 return NULL;
3178 p->arg.fh = NFS_FH(inode);
3179 p->arg.fl = &p->fl;
3180 p->arg.seqid = seqid;
3181 p->arg.stateid = &lsp->ls_stateid;
3182 p->lsp = lsp;
3183 atomic_inc(&lsp->ls_count);
3184 /* Ensure we don't close file until we're done freeing locks! */
3185 p->ctx = get_nfs_open_context(ctx);
3186 memcpy(&p->fl, fl, sizeof(p->fl));
3187 p->server = NFS_SERVER(inode);
3188 return p;
3189}
3190
06f814a3 3191static void nfs4_locku_release_calldata(void *data)
faf5f49c 3192{
963d8fe5 3193 struct nfs4_unlockdata *calldata = data;
911d1aaf 3194 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3195 nfs4_put_lock_state(calldata->lsp);
3196 put_nfs_open_context(calldata->ctx);
3197 kfree(calldata);
faf5f49c
TM		 3198}
3199
963d8fe5 3200static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3201{
963d8fe5 3202 struct nfs4_unlockdata *calldata = data;
faf5f49c 3203
06f814a3
TM		 3204 if (RPC_ASSASSINATED(task))
3205 return;
911d1aaf 3206 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3207 switch (task->tk_status) {
3208 case 0:
3209 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3210 calldata->res.stateid.data,
faf5f49c 3211 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3212 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3213 break;
3214 case -NFS4ERR_STALE_STATEID:
3215 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3216 break;
3217 default:
a6a352e9 3218 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3219 rpc_restart_call(task);
faf5f49c 3220 }
faf5f49c
TM		 3221}
3222
4ce70ada 3223static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3224{
4ce70ada 3225 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3226 struct rpc_message msg = {
3227 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3228 .rpc_argp = &calldata->arg,
3229 .rpc_resp = &calldata->res,
3230 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3231 };
faf5f49c 3232
911d1aaf 3233 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3234 return;
3235 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3236 /* Note: exit _without_ running nfs4_locku_done */
3237 task->tk_action = NULL;
faf5f49c
TM		 3238 return;
3239 }
26e976a8 3240 calldata->timestamp = jiffies;
faf5f49c
TM		 3241 rpc_call_setup(task, &msg, 0);
3242}
3243
963d8fe5 3244static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3245 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3246 .rpc_call_done = nfs4_locku_done,
06f814a3 3247 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3248};
3249
a5d16a4d
TM		 3250static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3251 struct nfs_open_context *ctx,
3252 struct nfs4_lock_state *lsp,
3253 struct nfs_seqid *seqid)
3254{
3255 struct nfs4_unlockdata *data;
a5d16a4d 3256
137d6aca
FF		 3257 /* Ensure this is an unlock - when canceling a lock, the
3258 * canceled lock is passed in, and it won't be an unlock.
3259 */
3260 fl->fl_type = F_UNLCK;
3261
a5d16a4d
TM		 3262 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3263 if (data == NULL) {
3264 nfs_free_seqid(seqid);
3265 return ERR_PTR(-ENOMEM);
3266 }
3267
7a1218a2 3268 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3269}
3270
faf5f49c
TM		 3271static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3272{
911d1aaf 3273 struct nfs_seqid *seqid;
1da177e4 3274 struct nfs4_lock_state *lsp;
06f814a3
TM		 3275 struct rpc_task *task;
3276 int status = 0;
faf5f49c 3277
8d0a8a9d 3278 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3279 /* Unlock _before_ we do the RPC call */
3280 request->fl_flags |= FL_EXISTS;
3281 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3282 goto out;
8d0a8a9d 3283 if (status != 0)
9b073574
TM		 3284 goto out;
3285 /* Is this a delegated lock? */
3286 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3287 goto out;
8d0a8a9d 3288 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3289 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3290 status = -ENOMEM;
911d1aaf 3291 if (seqid == NULL)
9b073574 3292 goto out;
cd3758e3 3293 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3294 status = PTR_ERR(task);
3295 if (IS_ERR(task))
9b073574 3296 goto out;
a5d16a4d 3297 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3298 rpc_put_task(task);
9b073574 3299out:
1da177e4
LT		 3300 return status;
3301}
3302
a5d16a4d
TM		 3303struct nfs4_lockdata {
3304 struct nfs_lock_args arg;
3305 struct nfs_lock_res res;
3306 struct nfs4_lock_state *lsp;
3307 struct nfs_open_context *ctx;
3308 struct file_lock fl;
26e976a8 3309 unsigned long timestamp;
a5d16a4d
TM		 3310 int rpc_status;
3311 int cancelled;
3312};
3313
3314static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3315 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3316{
a5d16a4d
TM		 3317 struct nfs4_lockdata *p;
3318 struct inode *inode = lsp->ls_state->inode;
1da177e4 3319 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3320
3321 p = kzalloc(sizeof(*p), GFP_KERNEL);
3322 if (p == NULL)
3323 return NULL;
3324
3325 p->arg.fh = NFS_FH(inode);
3326 p->arg.fl = &p->fl;
3327 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3328 if (p->arg.lock_seqid == NULL)
3329 goto out_free;
3330 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3331 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3332 p->arg.lock_owner.id = lsp->ls_id.id;
a5d16a4d
TM		 3333 p->lsp = lsp;
3334 atomic_inc(&lsp->ls_count);
3335 p->ctx = get_nfs_open_context(ctx);
3336 memcpy(&p->fl, fl, sizeof(p->fl));
3337 return p;
3338out_free:
3339 kfree(p);
3340 return NULL;
3341}
3342
3343static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3344{
3345 struct nfs4_lockdata *data = calldata;
3346 struct nfs4_state *state = data->lsp->ls_state;
3347 struct nfs4_state_owner *sp = state->owner;
1da177e4 3348 struct rpc_message msg = {
a5d16a4d
TM		 3349 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3350 .rpc_argp = &data->arg,
3351 .rpc_resp = &data->res,
3352 .rpc_cred = sp->so_cred,
1da177e4 3353 };
06735b34 3354
a5d16a4d
TM		 3355 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3356 return;
3357 dprintk("%s: begin!\n", __FUNCTION__);
3358 /* Do we need to do an open_to_lock_owner? */
3359 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3360 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3361 if (data->arg.open_seqid == NULL) {
3362 data->rpc_status = -ENOMEM;
3363 task->tk_action = NULL;
06735b34 3364 goto out;
8d0a8a9d 3365 }
a5d16a4d
TM		 3366 data->arg.open_stateid = &state->stateid;
3367 data->arg.new_lock_owner = 1;
3368 }
26e976a8 3369 data->timestamp = jiffies;
a5d16a4d 3370 rpc_call_setup(task, &msg, 0);
06735b34 3371out:
a5d16a4d
TM		 3372 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3373}
3374
3375static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3376{
3377 struct nfs4_lockdata *data = calldata;
3378
3379 dprintk("%s: begin!\n", __FUNCTION__);
3380
3381 data->rpc_status = task->tk_status;
3382 if (RPC_ASSASSINATED(task))
3383 goto out;
3384 if (data->arg.new_lock_owner != 0) {
3385 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3386 if (data->rpc_status == 0)
3387 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3388 else
3389 goto out;
3390 }
3391 if (data->rpc_status == 0) {
3392 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3393 sizeof(data->lsp->ls_stateid.data));
3394 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3395 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3396 }
3397 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3398out:
3399 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3400}
3401
3402static void nfs4_lock_release(void *calldata)
3403{
3404 struct nfs4_lockdata *data = calldata;
3405
3406 dprintk("%s: begin!\n", __FUNCTION__);
3407 if (data->arg.open_seqid != NULL)
3408 nfs_free_seqid(data->arg.open_seqid);
3409 if (data->cancelled != 0) {
3410 struct rpc_task *task;
3411 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3412 data->arg.lock_seqid);
3413 if (!IS_ERR(task))
e6b3c4db 3414 rpc_put_task(task);
a5d16a4d
TM		 3415 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3416 } else
3417 nfs_free_seqid(data->arg.lock_seqid);
3418 nfs4_put_lock_state(data->lsp);
3419 put_nfs_open_context(data->ctx);
3420 kfree(data);
3421 dprintk("%s: done!\n", __FUNCTION__);
3422}
3423
3424static const struct rpc_call_ops nfs4_lock_ops = {
3425 .rpc_call_prepare = nfs4_lock_prepare,
3426 .rpc_call_done = nfs4_lock_done,
3427 .rpc_release = nfs4_lock_release,
3428};
3429
3430static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3431{
3432 struct nfs4_lockdata *data;
3433 struct rpc_task *task;
3434 int ret;
3435
3436 dprintk("%s: begin!\n", __FUNCTION__);
cd3758e3 3437 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3438 fl->fl_u.nfs4_fl.owner);
3439 if (data == NULL)
3440 return -ENOMEM;
3441 if (IS_SETLKW(cmd))
3442 data->arg.block = 1;
3443 if (reclaim != 0)
3444 data->arg.reclaim = 1;
3445 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3446 &nfs4_lock_ops, data);
7a1218a2 3447 if (IS_ERR(task))
a5d16a4d 3448 return PTR_ERR(task);
a5d16a4d
TM		 3449 ret = nfs4_wait_for_completion_rpc_task(task);
3450 if (ret == 0) {
3451 ret = data->rpc_status;
3452 if (ret == -NFS4ERR_DENIED)
3453 ret = -EAGAIN;
3454 } else
3455 data->cancelled = 1;
e6b3c4db 3456 rpc_put_task(task);
a5d16a4d
TM		 3457 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3458 return ret;
1da177e4
LT		 3459}
3460
3461static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3462{
202b50dc
TM		 3463 struct nfs_server *server = NFS_SERVER(state->inode);
3464 struct nfs4_exception exception = { };
3465 int err;
3466
3467 do {
42a2d13e
TM		 3468 /* Cache the lock if possible... */
3469 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3470 return 0;
202b50dc
TM		 3471 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3472 if (err != -NFS4ERR_DELAY)
3473 break;
3474 nfs4_handle_exception(server, err, &exception);
3475 } while (exception.retry);
3476 return err;
1da177e4
LT		 3477}
3478
3479static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3480{
202b50dc
TM		 3481 struct nfs_server *server = NFS_SERVER(state->inode);
3482 struct nfs4_exception exception = { };
3483 int err;
3484
6bfc93ef
TM		 3485 err = nfs4_set_lock_state(state, request);
3486 if (err != 0)
3487 return err;
202b50dc 3488 do {
42a2d13e
TM		 3489 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3490 return 0;
202b50dc
TM		 3491 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3492 if (err != -NFS4ERR_DELAY)
3493 break;
3494 nfs4_handle_exception(server, err, &exception);
3495 } while (exception.retry);
3496 return err;
1da177e4
LT		 3497}
3498
3499static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3500{
adfa6f98 3501 struct nfs_client *clp = state->owner->so_client;
01c3b861 3502 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3503 int status;
3504
6bfc93ef 3505 /* Is this a delegated open? */
6bfc93ef
TM		 3506 status = nfs4_set_lock_state(state, request);
3507 if (status != 0)
3508 goto out;
01c3b861
TM		 3509 request->fl_flags |= FL_ACCESS;
3510 status = do_vfs_lock(request->fl_file, request);
3511 if (status < 0)
3512 goto out;
3513 down_read(&clp->cl_sem);
3514 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3515 struct nfs_inode *nfsi = NFS_I(state->inode);
3516 /* Yes: cache locks! */
3517 down_read(&nfsi->rwsem);
3518 /* ...but avoid races with delegation recall... */
3519 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3520 request->fl_flags = fl_flags & ~FL_SLEEP;
3521 status = do_vfs_lock(request->fl_file, request);
3522 up_read(&nfsi->rwsem);
3523 goto out_unlock;
3524 }
3525 up_read(&nfsi->rwsem);
3526 }
6bfc93ef
TM		 3527 status = _nfs4_do_setlk(state, cmd, request, 0);
3528 if (status != 0)
01c3b861 3529 goto out_unlock;
6bfc93ef 3530 /* Note: we always want to sleep here! */
01c3b861 3531 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3532 if (do_vfs_lock(request->fl_file, request) < 0)
3533 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3534out_unlock:
1da177e4 3535 up_read(&clp->cl_sem);
01c3b861
TM		 3536out:
3537 request->fl_flags = fl_flags;
1da177e4
LT		 3538 return status;
3539}
3540
3541static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3542{
3543 struct nfs4_exception exception = { };
3544 int err;
3545
3546 do {
3547 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3548 _nfs4_proc_setlk(state, cmd, request),
3549 &exception);
3550 } while (exception.retry);
3551 return err;
3552}
3553
3554static int
3555nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3556{
3557 struct nfs_open_context *ctx;
3558 struct nfs4_state *state;
3559 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3560 int status;
3561
3562 /* verify open state */
cd3758e3 3563 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3564 state = ctx->state;
3565
3566 if (request->fl_start < 0 || request->fl_end < 0)
3567 return -EINVAL;
3568
3569 if (IS_GETLK(cmd))
3570 return nfs4_proc_getlk(state, F_GETLK, request);
3571
3572 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3573 return -EINVAL;
3574
3575 if (request->fl_type == F_UNLCK)
3576 return nfs4_proc_unlck(state, cmd, request);
3577
3578 do {
3579 status = nfs4_proc_setlk(state, cmd, request);
3580 if ((status != -EAGAIN) || IS_SETLK(cmd))
3581 break;
3582 timeout = nfs4_set_lock_task_retry(timeout);
3583 status = -ERESTARTSYS;
3584 if (signalled())
3585 break;
3586 } while(status < 0);
1da177e4
LT		 3587 return status;
3588}
3589
888e694c
TM		 3590int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3591{
3592 struct nfs_server *server = NFS_SERVER(state->inode);
3593 struct nfs4_exception exception = { };
3594 int err;
3595
3596 err = nfs4_set_lock_state(state, fl);
3597 if (err != 0)
3598 goto out;
3599 do {
3600 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3601 if (err != -NFS4ERR_DELAY)
3602 break;
3603 err = nfs4_handle_exception(server, err, &exception);
3604 } while (exception.retry);
3605out:
3606 return err;
3607}
6b3b5496 3608
aa1870af
BF		 3609#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3610
6b3b5496
BF		 3611int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3612 size_t buflen, int flags)
3613{
4b580ee3
BF		 3614 struct inode *inode = dentry->d_inode;
3615
3616 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3617 return -EOPNOTSUPP;
3618
3619 if (!S_ISREG(inode->i_mode) &&
3620 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3621 return -EPERM;
3622
3623 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3624}
3625
3626/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3627 * and that's what we'll do for e.g. user attributes that haven't been set.
3628 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3629 * attributes in kernel-managed attribute namespaces. */
3630ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3631 size_t buflen)
3632{
aa1870af
BF		 3633 struct inode *inode = dentry->d_inode;
3634
3635 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3636 return -EOPNOTSUPP;
3637
3638 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3639}
3640
3641ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3642{
aa1870af 3643 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3644
096455a2
BF		 3645 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3646 return 0;
6b3b5496
BF		 3647 if (buf && buflen < len)
3648 return -ERANGE;
3649 if (buf)
aa1870af
BF		 3650 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3651 return len;
6b3b5496
BF		 3652}
3653
56659e99 3654int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3655 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3656{
3657 struct nfs_server *server = NFS_SERVER(dir);
3658 u32 bitmask[2] = {
361e624f
MN		 3659 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3660 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3661 };
3662 struct nfs4_fs_locations_arg args = {
3663 .dir_fh = NFS_FH(dir),
c228fd3a 3664 .name = name,
683b57b4
TM		 3665 .page = page,
3666 .bitmask = bitmask,
3667 };
3668 struct rpc_message msg = {
3669 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3670 .rpc_argp = &args,
7aaa0b3b 3671 .rpc_resp = fs_locations,
683b57b4
TM		 3672 };
3673 int status;
3674
3675 dprintk("%s: start\n", __FUNCTION__);
c228fd3a 3676 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3677 fs_locations->server = server;
830b8e33 3678 fs_locations->nlocations = 0;
683b57b4
TM		 3679 status = rpc_call_sync(server->client, &msg, 0);
3680 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3681 return status;
3682}
3683
1da177e4
LT		 3684struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3685 .recover_open = nfs4_open_reclaim,
3686 .recover_lock = nfs4_lock_reclaim,
3687};
3688
3689struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3690 .recover_open = nfs4_open_expired,
3691 .recover_lock = nfs4_lock_expired,
3692};
3693
92e1d5be 3694static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3695 .permission = nfs_permission,
3696 .getattr = nfs_getattr,
3697 .setattr = nfs_setattr,
3698 .getxattr = nfs4_getxattr,
3699 .setxattr = nfs4_setxattr,
3700 .listxattr = nfs4_listxattr,
3701};
3702
509de811 3703const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3704 .version = 4, /* protocol version */
3705 .dentry_ops = &nfs4_dentry_operations,
3706 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3707 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3708 .getroot = nfs4_proc_get_root,
3709 .getattr = nfs4_proc_getattr,
3710 .setattr = nfs4_proc_setattr,
2b3de441 3711 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3712 .lookup = nfs4_proc_lookup,
3713 .access = nfs4_proc_access,
3714 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3715 .create = nfs4_proc_create,
3716 .remove = nfs4_proc_remove,
3717 .unlink_setup = nfs4_proc_unlink_setup,
3718 .unlink_done = nfs4_proc_unlink_done,
3719 .rename = nfs4_proc_rename,
3720 .link = nfs4_proc_link,
3721 .symlink = nfs4_proc_symlink,
3722 .mkdir = nfs4_proc_mkdir,
3723 .rmdir = nfs4_proc_remove,
3724 .readdir = nfs4_proc_readdir,
3725 .mknod = nfs4_proc_mknod,
3726 .statfs = nfs4_proc_statfs,
3727 .fsinfo = nfs4_proc_fsinfo,
3728 .pathconf = nfs4_proc_pathconf,
e9326dca 3729 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3730 .decode_dirent = nfs4_decode_dirent,
3731 .read_setup = nfs4_proc_read_setup,
ec06c096 3732 .read_done = nfs4_read_done,
1da177e4 3733 .write_setup = nfs4_proc_write_setup,
788e7a89 3734 .write_done = nfs4_write_done,
1da177e4 3735 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3736 .commit_done = nfs4_commit_done,
02a913a7
TM		 3737 .file_open = nfs_open,
3738 .file_release = nfs_release,
1da177e4 3739 .lock = nfs4_proc_lock,
e50a1c2e 3740 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3741};
3742
3743/*
3744 * Local variables:
3745 * c-basic-offset: 8
3746 * End:
3747 */
Linux 6.x block layer and io_uring tree(s)