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NFSv4: Simplify _nfs4_do_access()
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
006ea73e 54#include "iostat.h"
1da177e4
LT		 55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
2066fe89 58#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
cdd4e68b 61struct nfs4_opendata;
864472e9 62static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
1da177e4 65static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
faf5f49c 66static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
adfa6f98 67static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
9936781d
TM		 68static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
69static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
1da177e4 70
1da177e4
LT		 71/* Prevent leaks of NFSv4 errors into userland */
72int nfs4_map_errors(int err)
73{
74 if (err < -1000) {
75 dprintk("%s could not handle NFSv4 error %d\n",
76 __FUNCTION__, -err);
77 return -EIO;
78 }
79 return err;
80}
81
82/*
83 * This is our standard bitmap for GETATTR requests.
84 */
85const u32 nfs4_fattr_bitmap[2] = {
86 FATTR4_WORD0_TYPE
87 | FATTR4_WORD0_CHANGE
88 | FATTR4_WORD0_SIZE
89 | FATTR4_WORD0_FSID
90 | FATTR4_WORD0_FILEID,
91 FATTR4_WORD1_MODE
92 | FATTR4_WORD1_NUMLINKS
93 | FATTR4_WORD1_OWNER
94 | FATTR4_WORD1_OWNER_GROUP
95 | FATTR4_WORD1_RAWDEV
96 | FATTR4_WORD1_SPACE_USED
97 | FATTR4_WORD1_TIME_ACCESS
98 | FATTR4_WORD1_TIME_METADATA
99 | FATTR4_WORD1_TIME_MODIFY
100};
101
102const u32 nfs4_statfs_bitmap[2] = {
103 FATTR4_WORD0_FILES_AVAIL
104 | FATTR4_WORD0_FILES_FREE
105 | FATTR4_WORD0_FILES_TOTAL,
106 FATTR4_WORD1_SPACE_AVAIL
107 | FATTR4_WORD1_SPACE_FREE
108 | FATTR4_WORD1_SPACE_TOTAL
109};
110
4ce79717 111const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 112 FATTR4_WORD0_MAXLINK
113 | FATTR4_WORD0_MAXNAME,
114 0
115};
116
117const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
118 | FATTR4_WORD0_MAXREAD
119 | FATTR4_WORD0_MAXWRITE
120 | FATTR4_WORD0_LEASE_TIME,
121 0
122};
123
830b8e33
MN		 124const u32 nfs4_fs_locations_bitmap[2] = {
125 FATTR4_WORD0_TYPE
126 | FATTR4_WORD0_CHANGE
127 | FATTR4_WORD0_SIZE
128 | FATTR4_WORD0_FSID
129 | FATTR4_WORD0_FILEID
130 | FATTR4_WORD0_FS_LOCATIONS,
131 FATTR4_WORD1_MODE
132 | FATTR4_WORD1_NUMLINKS
133 | FATTR4_WORD1_OWNER
134 | FATTR4_WORD1_OWNER_GROUP
135 | FATTR4_WORD1_RAWDEV
136 | FATTR4_WORD1_SPACE_USED
137 | FATTR4_WORD1_TIME_ACCESS
138 | FATTR4_WORD1_TIME_METADATA
139 | FATTR4_WORD1_TIME_MODIFY
140 | FATTR4_WORD1_MOUNTED_ON_FILEID
141};
142
bc4785cd 143static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 144 struct nfs4_readdir_arg *readdir)
145{
0dbb4c67 146 __be32 *start, *p;
1da177e4
LT		 147
148 BUG_ON(readdir->count < 80);
149 if (cookie > 2) {
b7ef1956 150 readdir->cookie = cookie;
1da177e4
LT		 151 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
152 return;
153 }
154
155 readdir->cookie = 0;
156 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
157 if (cookie == 2)
158 return;
159
160 /*
161 * NFSv4 servers do not return entries for '.' and '..'
162 * Therefore, we fake these entries here. We let '.'
163 * have cookie 0 and '..' have cookie 1. Note that
164 * when talking to the server, we always send cookie 0
165 * instead of 1 or 2.
166 */
0dbb4c67 167 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 168
169 if (cookie == 0) {
170 *p++ = xdr_one; /* next */
171 *p++ = xdr_zero; /* cookie, first word */
172 *p++ = xdr_one; /* cookie, second word */
173 *p++ = xdr_one; /* entry len */
174 memcpy(p, ".\0\0\0", 4); /* entry */
175 p++;
176 *p++ = xdr_one; /* bitmap length */
177 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
178 *p++ = htonl(8); /* attribute buffer length */
4e769b93 179 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
1da177e4
LT		 180 }
181
182 *p++ = xdr_one; /* next */
183 *p++ = xdr_zero; /* cookie, first word */
184 *p++ = xdr_two; /* cookie, second word */
185 *p++ = xdr_two; /* entry len */
186 memcpy(p, "..\0\0", 4); /* entry */
187 p++;
188 *p++ = xdr_one; /* bitmap length */
189 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
190 *p++ = htonl(8); /* attribute buffer length */
4e769b93 191 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
1da177e4
LT		 192
193 readdir->pgbase = (char *)p - (char *)start;
194 readdir->count -= readdir->pgbase;
195 kunmap_atomic(start, KM_USER0);
196}
197
26e976a8 198static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 199{
7539bbab 200 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 201 spin_lock(&clp->cl_lock);
202 if (time_before(clp->cl_last_renewal,timestamp))
203 clp->cl_last_renewal = timestamp;
204 spin_unlock(&clp->cl_lock);
205}
206
38478b24 207static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 208{
38478b24 209 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 210
38478b24
TM		 211 spin_lock(&dir->i_lock);
212 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
1da177e4
LT		 213 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
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
TM		 1399 if (IS_ERR(state)) {
1400 if (PTR_ERR(state) == -ENOENT)
1401 d_add(dentry, NULL);
1402 return (struct dentry *)state;
1403 }
24ac23ab 1404 res = d_add_unique(dentry, igrab(state->inode));
02a913a7 1405 if (res != NULL)
deee9369 1406 path.dentry = res;
4a35bd41 1407 nfs4_intent_set_file(nd, &path, state);
02a913a7 1408 return res;
1da177e4
LT		 1409}
1410
1411int
02a913a7 1412nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1413{
ad389da7
TM		 1414 struct path path = {
1415 .mnt = nd->mnt,
1416 .dentry = dentry,
1417 };
1da177e4
LT		 1418 struct rpc_cred *cred;
1419 struct nfs4_state *state;
1da177e4 1420
1f163415 1421 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1422 if (IS_ERR(cred))
1423 return PTR_ERR(cred);
aac00a8d 1424 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1425 put_rpccred(cred);
02a913a7
TM		 1426 if (IS_ERR(state)) {
1427 switch (PTR_ERR(state)) {
1428 case -EPERM:
1429 case -EACCES:
1430 case -EDQUOT:
1431 case -ENOSPC:
1432 case -EROFS:
1433 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1434 return 1;
b87c0adf
CL		 1435 default:
1436 goto out_drop;
02a913a7 1437 }
02a913a7 1438 }
24ac23ab 1439 if (state->inode == dentry->d_inode) {
4a35bd41 1440 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1441 return 1;
1442 }
4a35bd41 1443 nfs4_close_state(&path, state, openflags);
02a913a7
TM		 1444out_drop:
1445 d_drop(dentry);
1da177e4
LT		 1446 return 0;
1447}
1448
1449
1450static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1451{
1452 struct nfs4_server_caps_res res = {};
1453 struct rpc_message msg = {
1454 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1455 .rpc_argp = fhandle,
1456 .rpc_resp = &res,
1457 };
1458 int status;
1459
1460 status = rpc_call_sync(server->client, &msg, 0);
1461 if (status == 0) {
1462 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1463 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1464 server->caps |= NFS_CAP_ACLS;
1465 if (res.has_links != 0)
1466 server->caps |= NFS_CAP_HARDLINKS;
1467 if (res.has_symlinks != 0)
1468 server->caps |= NFS_CAP_SYMLINKS;
1469 server->acl_bitmask = res.acl_bitmask;
1470 }
1471 return status;
1472}
1473
55a97593 1474int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1475{
1476 struct nfs4_exception exception = { };
1477 int err;
1478 do {
1479 err = nfs4_handle_exception(server,
1480 _nfs4_server_capabilities(server, fhandle),
1481 &exception);
1482 } while (exception.retry);
1483 return err;
1484}
1485
1486static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1487 struct nfs_fsinfo *info)
1488{
1da177e4
LT		 1489 struct nfs4_lookup_root_arg args = {
1490 .bitmask = nfs4_fattr_bitmap,
1491 };
1492 struct nfs4_lookup_res res = {
1493 .server = server,
0e574af1 1494 .fattr = info->fattr,
1da177e4
LT		 1495 .fh = fhandle,
1496 };
1497 struct rpc_message msg = {
1498 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1499 .rpc_argp = &args,
1500 .rpc_resp = &res,
1501 };
0e574af1 1502 nfs_fattr_init(info->fattr);
1da177e4
LT		 1503 return rpc_call_sync(server->client, &msg, 0);
1504}
1505
1506static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1507 struct nfs_fsinfo *info)
1508{
1509 struct nfs4_exception exception = { };
1510 int err;
1511 do {
1512 err = nfs4_handle_exception(server,
1513 _nfs4_lookup_root(server, fhandle, info),
1514 &exception);
1515 } while (exception.retry);
1516 return err;
1517}
1518
54ceac45
DH		 1519/*
1520 * get the file handle for the "/" directory on the server
1521 */
1da177e4 1522static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1523 struct nfs_fsinfo *info)
1da177e4 1524{
1da177e4
LT		 1525 int status;
1526
1da177e4 1527 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1528 if (status == 0)
1529 status = nfs4_server_capabilities(server, fhandle);
1530 if (status == 0)
1531 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1532 return nfs4_map_errors(status);
1da177e4
LT		 1533}
1534
6b97fd3d
MN		 1535/*
1536 * Get locations and (maybe) other attributes of a referral.
1537 * Note that we'll actually follow the referral later when
1538 * we detect fsid mismatch in inode revalidation
1539 */
56659e99 1540static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
6b97fd3d
MN		 1541{
1542 int status = -ENOMEM;
1543 struct page *page = NULL;
1544 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1545
1546 page = alloc_page(GFP_KERNEL);
1547 if (page == NULL)
1548 goto out;
1549 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1550 if (locations == NULL)
1551 goto out;
1552
c228fd3a 1553 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1554 if (status != 0)
1555 goto out;
1556 /* Make sure server returned a different fsid for the referral */
1557 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1558 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1559 status = -EIO;
1560 goto out;
1561 }
1562
1563 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1564 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1565 if (!fattr->mode)
1566 fattr->mode = S_IFDIR;
1567 memset(fhandle, 0, sizeof(struct nfs_fh));
1568out:
1569 if (page)
1570 __free_page(page);
1571 if (locations)
1572 kfree(locations);
1573 return status;
1574}
1575
1da177e4
LT		 1576static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1577{
1578 struct nfs4_getattr_arg args = {
1579 .fh = fhandle,
1580 .bitmask = server->attr_bitmask,
1581 };
1582 struct nfs4_getattr_res res = {
1583 .fattr = fattr,
1584 .server = server,
1585 };
1586 struct rpc_message msg = {
1587 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1588 .rpc_argp = &args,
1589 .rpc_resp = &res,
1590 };
1591
0e574af1 1592 nfs_fattr_init(fattr);
1da177e4
LT		 1593 return rpc_call_sync(server->client, &msg, 0);
1594}
1595
1596static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1597{
1598 struct nfs4_exception exception = { };
1599 int err;
1600 do {
1601 err = nfs4_handle_exception(server,
1602 _nfs4_proc_getattr(server, fhandle, fattr),
1603 &exception);
1604 } while (exception.retry);
1605 return err;
1606}
1607
1608/*
1609 * The file is not closed if it is opened due to the a request to change
1610 * the size of the file. The open call will not be needed once the
1611 * VFS layer lookup-intents are implemented.
1612 *
1613 * Close is called when the inode is destroyed.
1614 * If we haven't opened the file for O_WRONLY, we
1615 * need to in the size_change case to obtain a stateid.
1616 *
1617 * Got race?
1618 * Because OPEN is always done by name in nfsv4, it is
1619 * possible that we opened a different file by the same
1620 * name. We can recognize this race condition, but we
1621 * can't do anything about it besides returning an error.
1622 *
1623 * This will be fixed with VFS changes (lookup-intent).
1624 */
1625static int
1626nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1627 struct iattr *sattr)
1628{
08e9eac4
TM		 1629 struct rpc_cred *cred;
1630 struct inode *inode = dentry->d_inode;
d530838b
TM		 1631 struct nfs_open_context *ctx;
1632 struct nfs4_state *state = NULL;
1da177e4
LT		 1633 int status;
1634
0e574af1 1635 nfs_fattr_init(fattr);
1da177e4 1636
1f163415 1637 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1638 if (IS_ERR(cred))
1639 return PTR_ERR(cred);
d530838b
TM		 1640
1641 /* Search for an existing open(O_WRITE) file */
1642 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1643 if (ctx != NULL)
1644 state = ctx->state;
08e9eac4 1645
3e4f6290 1646 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1647 if (status == 0)
1648 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1649 if (ctx != NULL)
1650 put_nfs_open_context(ctx);
08e9eac4 1651 put_rpccred(cred);
1da177e4
LT		 1652 return status;
1653}
1654
56659e99
TM		 1655static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1656 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1657 struct nfs_fattr *fattr)
1658{
1659 int status;
1660 struct nfs4_lookup_arg args = {
1661 .bitmask = server->attr_bitmask,
1662 .dir_fh = dirfh,
1663 .name = name,
1664 };
1665 struct nfs4_lookup_res res = {
1666 .server = server,
1667 .fattr = fattr,
1668 .fh = fhandle,
1669 };
1670 struct rpc_message msg = {
1671 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1672 .rpc_argp = &args,
1673 .rpc_resp = &res,
1674 };
1675
1676 nfs_fattr_init(fattr);
1677
1678 dprintk("NFS call lookupfh %s\n", name->name);
1679 status = rpc_call_sync(server->client, &msg, 0);
1680 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1681 return status;
1682}
1683
1684static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1685 struct qstr *name, struct nfs_fh *fhandle,
1686 struct nfs_fattr *fattr)
1687{
1688 struct nfs4_exception exception = { };
1689 int err;
1690 do {
4e56e082
TM		 1691 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1692 /* FIXME: !!!! */
1693 if (err == -NFS4ERR_MOVED) {
1694 err = -EREMOTE;
1695 break;
1696 }
1697 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1698 } while (exception.retry);
1699 return err;
1700}
1701
56659e99 1702static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1703 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1704{
4e56e082 1705 int status;
1da177e4
LT		 1706
1707 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1708 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1709 if (status == -NFS4ERR_MOVED)
1710 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1711 dprintk("NFS reply lookup: %d\n", status);
1712 return status;
1713}
1714
1715static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1716{
1717 struct nfs4_exception exception = { };
1718 int err;
1719 do {
1720 err = nfs4_handle_exception(NFS_SERVER(dir),
1721 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1722 &exception);
1723 } while (exception.retry);
1724 return err;
1725}
1726
1727static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1728{
1729 struct nfs4_accessargs args = {
1730 .fh = NFS_FH(inode),
1731 };
1732 struct nfs4_accessres res = { 0 };
1733 struct rpc_message msg = {
1734 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1735 .rpc_argp = &args,
1736 .rpc_resp = &res,
1737 .rpc_cred = entry->cred,
1738 };
1739 int mode = entry->mask;
1740 int status;
1741
1742 /*
1743 * Determine which access bits we want to ask for...
1744 */
1745 if (mode & MAY_READ)
1746 args.access |= NFS4_ACCESS_READ;
1747 if (S_ISDIR(inode->i_mode)) {
1748 if (mode & MAY_WRITE)
1749 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1750 if (mode & MAY_EXEC)
1751 args.access |= NFS4_ACCESS_LOOKUP;
1752 } else {
1753 if (mode & MAY_WRITE)
1754 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1755 if (mode & MAY_EXEC)
1756 args.access |= NFS4_ACCESS_EXECUTE;
1757 }
1758 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1759 if (!status) {
1760 entry->mask = 0;
1761 if (res.access & NFS4_ACCESS_READ)
1762 entry->mask |= MAY_READ;
1763 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1764 entry->mask |= MAY_WRITE;
1765 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1766 entry->mask |= MAY_EXEC;
1767 }
1768 return status;
1769}
1770
1771static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1772{
1773 struct nfs4_exception exception = { };
1774 int err;
1775 do {
1776 err = nfs4_handle_exception(NFS_SERVER(inode),
1777 _nfs4_proc_access(inode, entry),
1778 &exception);
1779 } while (exception.retry);
1780 return err;
1781}
1782
1783/*
1784 * TODO: For the time being, we don't try to get any attributes
1785 * along with any of the zero-copy operations READ, READDIR,
1786 * READLINK, WRITE.
1787 *
1788 * In the case of the first three, we want to put the GETATTR
1789 * after the read-type operation -- this is because it is hard
1790 * to predict the length of a GETATTR response in v4, and thus
1791 * align the READ data correctly. This means that the GETATTR
1792 * may end up partially falling into the page cache, and we should
1793 * shift it into the 'tail' of the xdr_buf before processing.
1794 * To do this efficiently, we need to know the total length
1795 * of data received, which doesn't seem to be available outside
1796 * of the RPC layer.
1797 *
1798 * In the case of WRITE, we also want to put the GETATTR after
1799 * the operation -- in this case because we want to make sure
1800 * we get the post-operation mtime and size. This means that
1801 * we can't use xdr_encode_pages() as written: we need a variant
1802 * of it which would leave room in the 'tail' iovec.
1803 *
1804 * Both of these changes to the XDR layer would in fact be quite
1805 * minor, but I decided to leave them for a subsequent patch.
1806 */
1807static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1808 unsigned int pgbase, unsigned int pglen)
1809{
1810 struct nfs4_readlink args = {
1811 .fh = NFS_FH(inode),
1812 .pgbase = pgbase,
1813 .pglen = pglen,
1814 .pages = &page,
1815 };
1816 struct rpc_message msg = {
1817 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1818 .rpc_argp = &args,
1819 .rpc_resp = NULL,
1820 };
1821
1822 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1823}
1824
1825static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1826 unsigned int pgbase, unsigned int pglen)
1827{
1828 struct nfs4_exception exception = { };
1829 int err;
1830 do {
1831 err = nfs4_handle_exception(NFS_SERVER(inode),
1832 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1833 &exception);
1834 } while (exception.retry);
1835 return err;
1836}
1837
1da177e4
LT		 1838/*
1839 * Got race?
1840 * We will need to arrange for the VFS layer to provide an atomic open.
1841 * Until then, this create/open method is prone to inefficiency and race
1842 * conditions due to the lookup, create, and open VFS calls from sys_open()
1843 * placed on the wire.
1844 *
1845 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1846 * The file will be opened again in the subsequent VFS open call
1847 * (nfs4_proc_file_open).
1848 *
1849 * The open for read will just hang around to be used by any process that
1850 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1851 */
1852
1853static int
1854nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1855 int flags, struct nameidata *nd)
1da177e4 1856{
ad389da7
TM		 1857 struct path path = {
1858 .mnt = nd->mnt,
1859 .dentry = dentry,
1860 };
1da177e4
LT		 1861 struct nfs4_state *state;
1862 struct rpc_cred *cred;
1863 int status = 0;
1864
1f163415 1865 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1866 if (IS_ERR(cred)) {
1867 status = PTR_ERR(cred);
1868 goto out;
1869 }
ad389da7 1870 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1da177e4
LT		 1871 put_rpccred(cred);
1872 if (IS_ERR(state)) {
1873 status = PTR_ERR(state);
1874 goto out;
1875 }
24ac23ab 1876 d_instantiate(dentry, igrab(state->inode));
1da177e4
LT		 1877 if (flags & O_EXCL) {
1878 struct nfs_fattr fattr;
3e4f6290 1879 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1880 if (status == 0)
65e4308d 1881 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1882 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1883 }
ad389da7 1884 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1885 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1886 else
4a35bd41 1887 nfs4_close_state(&path, state, flags);
1da177e4
LT		 1888out:
1889 return status;
1890}
1891
1892static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1893{
16e42959 1894 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 1895 struct nfs_removeargs args = {
1da177e4 1896 .fh = NFS_FH(dir),
4fdc17b2
TM		 1897 .name.len = name->len,
1898 .name.name = name->name,
16e42959
TM		 1899 .bitmask = server->attr_bitmask,
1900 };
4fdc17b2 1901 struct nfs_removeres res = {
16e42959 1902 .server = server,
1da177e4 1903 };
1da177e4 1904 struct rpc_message msg = {
4fdc17b2
TM		 1905 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1906 .rpc_argp = &args,
1907 .rpc_resp = &res,
1da177e4
LT		 1908 };
1909 int status;
1910
4fdc17b2 1911 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 1912 status = rpc_call_sync(server->client, &msg, 0);
1913 if (status == 0) {
1914 update_changeattr(dir, &res.cinfo);
4fdc17b2 1915 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 1916 }
1da177e4
LT		 1917 return status;
1918}
1919
1920static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1921{
1922 struct nfs4_exception exception = { };
1923 int err;
1924 do {
1925 err = nfs4_handle_exception(NFS_SERVER(dir),
1926 _nfs4_proc_remove(dir, name),
1927 &exception);
1928 } while (exception.retry);
1929 return err;
1930}
1931
e4eff1a6 1932static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 1933{
e4eff1a6
TM		 1934 struct nfs_server *server = NFS_SERVER(dir);
1935 struct nfs_removeargs *args = msg->rpc_argp;
1936 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 1937
e4eff1a6
TM		 1938 args->bitmask = server->attr_bitmask;
1939 res->server = server;
1da177e4 1940 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 1941}
1942
e4eff1a6 1943static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 1944{
e4eff1a6
TM		 1945 struct nfs_removeres *res = task->tk_msg.rpc_resp;
1946
1947 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1948 return 0;
1949 update_changeattr(dir, &res->cinfo);
1950 nfs_post_op_update_inode(dir, &res->dir_attr);
1951 return 1;
1da177e4
LT		 1952}
1953
1954static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1955 struct inode *new_dir, struct qstr *new_name)
1956{
6caf2c82 1957 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1958 struct nfs4_rename_arg arg = {
1959 .old_dir = NFS_FH(old_dir),
1960 .new_dir = NFS_FH(new_dir),
1961 .old_name = old_name,
1962 .new_name = new_name,
6caf2c82
TM		 1963 .bitmask = server->attr_bitmask,
1964 };
1965 struct nfs_fattr old_fattr, new_fattr;
1966 struct nfs4_rename_res res = {
1967 .server = server,
1968 .old_fattr = &old_fattr,
1969 .new_fattr = &new_fattr,
1da177e4 1970 };
1da177e4
LT		 1971 struct rpc_message msg = {
1972 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1973 .rpc_argp = &arg,
1974 .rpc_resp = &res,
1975 };
1976 int status;
1977
6caf2c82
TM		 1978 nfs_fattr_init(res.old_fattr);
1979 nfs_fattr_init(res.new_fattr);
1980 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 1981
1982 if (!status) {
1983 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 1984 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 1985 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 1986 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 1987 }
1988 return status;
1989}
1990
1991static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1992 struct inode *new_dir, struct qstr *new_name)
1993{
1994 struct nfs4_exception exception = { };
1995 int err;
1996 do {
1997 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1998 _nfs4_proc_rename(old_dir, old_name,
1999 new_dir, new_name),
2000 &exception);
2001 } while (exception.retry);
2002 return err;
2003}
2004
2005static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2006{
91ba2eee 2007 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2008 struct nfs4_link_arg arg = {
2009 .fh = NFS_FH(inode),
2010 .dir_fh = NFS_FH(dir),
2011 .name = name,
91ba2eee
TM		 2012 .bitmask = server->attr_bitmask,
2013 };
2014 struct nfs_fattr fattr, dir_attr;
2015 struct nfs4_link_res res = {
2016 .server = server,
2017 .fattr = &fattr,
2018 .dir_attr = &dir_attr,
1da177e4 2019 };
1da177e4
LT		 2020 struct rpc_message msg = {
2021 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2022 .rpc_argp = &arg,
91ba2eee 2023 .rpc_resp = &res,
1da177e4
LT		 2024 };
2025 int status;
2026
91ba2eee
TM		 2027 nfs_fattr_init(res.fattr);
2028 nfs_fattr_init(res.dir_attr);
2029 status = rpc_call_sync(server->client, &msg, 0);
2030 if (!status) {
2031 update_changeattr(dir, &res.cinfo);
2032 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2033 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2034 }
1da177e4
LT		 2035
2036 return status;
2037}
2038
2039static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2040{
2041 struct nfs4_exception exception = { };
2042 int err;
2043 do {
2044 err = nfs4_handle_exception(NFS_SERVER(inode),
2045 _nfs4_proc_link(inode, dir, name),
2046 &exception);
2047 } while (exception.retry);
2048 return err;
2049}
2050
4f390c15 2051static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2052 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2053{
2054 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 2055 struct nfs_fh fhandle;
2056 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2057 struct nfs4_create_arg arg = {
2058 .dir_fh = NFS_FH(dir),
2059 .server = server,
4f390c15 2060 .name = &dentry->d_name,
1da177e4
LT		 2061 .attrs = sattr,
2062 .ftype = NF4LNK,
2063 .bitmask = server->attr_bitmask,
2064 };
2065 struct nfs4_create_res res = {
2066 .server = server,
4f390c15
CL		 2067 .fh = &fhandle,
2068 .fattr = &fattr,
56ae19f3 2069 .dir_fattr = &dir_fattr,
1da177e4
LT		 2070 };
2071 struct rpc_message msg = {
2072 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2073 .rpc_argp = &arg,
2074 .rpc_resp = &res,
2075 };
2076 int status;
2077
94a6d753 2078 if (len > NFS4_MAXPATHLEN)
1da177e4 2079 return -ENAMETOOLONG;
4f390c15 2080
94a6d753
CL		 2081 arg.u.symlink.pages = &page;
2082 arg.u.symlink.len = len;
4f390c15 2083 nfs_fattr_init(&fattr);
56ae19f3 2084 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2085
2086 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2087 if (!status) {
1da177e4 2088 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2089 nfs_post_op_update_inode(dir, res.dir_fattr);
2090 status = nfs_instantiate(dentry, &fhandle, &fattr);
2091 }
1da177e4
LT		 2092 return status;
2093}
2094
4f390c15 2095static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2096 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2097{
2098 struct nfs4_exception exception = { };
2099 int err;
2100 do {
2101 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2102 _nfs4_proc_symlink(dir, dentry, page,
2103 len, sattr),
1da177e4
LT		 2104 &exception);
2105 } while (exception.retry);
2106 return err;
2107}
2108
2109static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2110 struct iattr *sattr)
2111{
2112 struct nfs_server *server = NFS_SERVER(dir);
2113 struct nfs_fh fhandle;
56ae19f3 2114 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2115 struct nfs4_create_arg arg = {
2116 .dir_fh = NFS_FH(dir),
2117 .server = server,
2118 .name = &dentry->d_name,
2119 .attrs = sattr,
2120 .ftype = NF4DIR,
2121 .bitmask = server->attr_bitmask,
2122 };
2123 struct nfs4_create_res res = {
2124 .server = server,
2125 .fh = &fhandle,
2126 .fattr = &fattr,
56ae19f3 2127 .dir_fattr = &dir_fattr,
1da177e4
LT		 2128 };
2129 struct rpc_message msg = {
2130 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2131 .rpc_argp = &arg,
2132 .rpc_resp = &res,
2133 };
2134 int status;
2135
0e574af1 2136 nfs_fattr_init(&fattr);
56ae19f3 2137 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2138
2139 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2140 if (!status) {
2141 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2142 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2143 status = nfs_instantiate(dentry, &fhandle, &fattr);
2144 }
2145 return status;
2146}
2147
2148static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2149 struct iattr *sattr)
2150{
2151 struct nfs4_exception exception = { };
2152 int err;
2153 do {
2154 err = nfs4_handle_exception(NFS_SERVER(dir),
2155 _nfs4_proc_mkdir(dir, dentry, sattr),
2156 &exception);
2157 } while (exception.retry);
2158 return err;
2159}
2160
2161static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2162 u64 cookie, struct page *page, unsigned int count, int plus)
2163{
2164 struct inode *dir = dentry->d_inode;
2165 struct nfs4_readdir_arg args = {
2166 .fh = NFS_FH(dir),
2167 .pages = &page,
2168 .pgbase = 0,
2169 .count = count,
2170 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2171 };
2172 struct nfs4_readdir_res res;
2173 struct rpc_message msg = {
2174 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2175 .rpc_argp = &args,
2176 .rpc_resp = &res,
2177 .rpc_cred = cred,
2178 };
2179 int status;
2180
eadf4598
TM		 2181 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2182 dentry->d_parent->d_name.name,
2183 dentry->d_name.name,
2184 (unsigned long long)cookie);
1da177e4
LT		 2185 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2186 res.pgbase = args.pgbase;
2187 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2188 if (status == 0)
2189 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
eadf4598 2190 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2191 return status;
2192}
2193
2194static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2195 u64 cookie, struct page *page, unsigned int count, int plus)
2196{
2197 struct nfs4_exception exception = { };
2198 int err;
2199 do {
2200 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2201 _nfs4_proc_readdir(dentry, cred, cookie,
2202 page, count, plus),
2203 &exception);
2204 } while (exception.retry);
2205 return err;
2206}
2207
2208static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2209 struct iattr *sattr, dev_t rdev)
2210{
2211 struct nfs_server *server = NFS_SERVER(dir);
2212 struct nfs_fh fh;
56ae19f3 2213 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2214 struct nfs4_create_arg arg = {
2215 .dir_fh = NFS_FH(dir),
2216 .server = server,
2217 .name = &dentry->d_name,
2218 .attrs = sattr,
2219 .bitmask = server->attr_bitmask,
2220 };
2221 struct nfs4_create_res res = {
2222 .server = server,
2223 .fh = &fh,
2224 .fattr = &fattr,
56ae19f3 2225 .dir_fattr = &dir_fattr,
1da177e4
LT		 2226 };
2227 struct rpc_message msg = {
2228 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2229 .rpc_argp = &arg,
2230 .rpc_resp = &res,
2231 };
2232 int status;
2233 int mode = sattr->ia_mode;
2234
0e574af1 2235 nfs_fattr_init(&fattr);
56ae19f3 2236 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2237
2238 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2239 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2240 if (S_ISFIFO(mode))
2241 arg.ftype = NF4FIFO;
2242 else if (S_ISBLK(mode)) {
2243 arg.ftype = NF4BLK;
2244 arg.u.device.specdata1 = MAJOR(rdev);
2245 arg.u.device.specdata2 = MINOR(rdev);
2246 }
2247 else if (S_ISCHR(mode)) {
2248 arg.ftype = NF4CHR;
2249 arg.u.device.specdata1 = MAJOR(rdev);
2250 arg.u.device.specdata2 = MINOR(rdev);
2251 }
2252 else
2253 arg.ftype = NF4SOCK;
2254
2255 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2256 if (status == 0) {
2257 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2258 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2259 status = nfs_instantiate(dentry, &fh, &fattr);
2260 }
2261 return status;
2262}
2263
2264static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2265 struct iattr *sattr, dev_t rdev)
2266{
2267 struct nfs4_exception exception = { };
2268 int err;
2269 do {
2270 err = nfs4_handle_exception(NFS_SERVER(dir),
2271 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2272 &exception);
2273 } while (exception.retry);
2274 return err;
2275}
2276
2277static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2278 struct nfs_fsstat *fsstat)
2279{
2280 struct nfs4_statfs_arg args = {
2281 .fh = fhandle,
2282 .bitmask = server->attr_bitmask,
2283 };
2284 struct rpc_message msg = {
2285 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2286 .rpc_argp = &args,
2287 .rpc_resp = fsstat,
2288 };
2289
0e574af1 2290 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2291 return rpc_call_sync(server->client, &msg, 0);
2292}
2293
2294static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2295{
2296 struct nfs4_exception exception = { };
2297 int err;
2298 do {
2299 err = nfs4_handle_exception(server,
2300 _nfs4_proc_statfs(server, fhandle, fsstat),
2301 &exception);
2302 } while (exception.retry);
2303 return err;
2304}
2305
2306static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2307 struct nfs_fsinfo *fsinfo)
2308{
2309 struct nfs4_fsinfo_arg args = {
2310 .fh = fhandle,
2311 .bitmask = server->attr_bitmask,
2312 };
2313 struct rpc_message msg = {
2314 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2315 .rpc_argp = &args,
2316 .rpc_resp = fsinfo,
2317 };
2318
2319 return rpc_call_sync(server->client, &msg, 0);
2320}
2321
2322static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2323{
2324 struct nfs4_exception exception = { };
2325 int err;
2326
2327 do {
2328 err = nfs4_handle_exception(server,
2329 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2330 &exception);
2331 } while (exception.retry);
2332 return err;
2333}
2334
2335static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2336{
0e574af1 2337 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2338 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2339}
2340
2341static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2342 struct nfs_pathconf *pathconf)
2343{
2344 struct nfs4_pathconf_arg args = {
2345 .fh = fhandle,
2346 .bitmask = server->attr_bitmask,
2347 };
2348 struct rpc_message msg = {
2349 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2350 .rpc_argp = &args,
2351 .rpc_resp = pathconf,
2352 };
2353
2354 /* None of the pathconf attributes are mandatory to implement */
2355 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2356 memset(pathconf, 0, sizeof(*pathconf));
2357 return 0;
2358 }
2359
0e574af1 2360 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2361 return rpc_call_sync(server->client, &msg, 0);
2362}
2363
2364static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2365 struct nfs_pathconf *pathconf)
2366{
2367 struct nfs4_exception exception = { };
2368 int err;
2369
2370 do {
2371 err = nfs4_handle_exception(server,
2372 _nfs4_proc_pathconf(server, fhandle, pathconf),
2373 &exception);
2374 } while (exception.retry);
2375 return err;
2376}
2377
ec06c096 2378static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2379{
ec06c096 2380 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2381
ec06c096 2382 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2383 rpc_restart_call(task);
ec06c096 2384 return -EAGAIN;
1da177e4
LT		 2385 }
2386 if (task->tk_status > 0)
ec06c096
TM		 2387 renew_lease(server, data->timestamp);
2388 return 0;
1da177e4
LT		 2389}
2390
ec06c096 2391static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2392{
1da177e4
LT		 2393 struct rpc_message msg = {
2394 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2395 .rpc_argp = &data->args,
2396 .rpc_resp = &data->res,
2397 .rpc_cred = data->cred,
2398 };
1da177e4
LT		 2399
2400 data->timestamp = jiffies;
2401
ec06c096 2402 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2403}
2404
788e7a89 2405static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2406{
1da177e4
LT		 2407 struct inode *inode = data->inode;
2408
2409 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2410 rpc_restart_call(task);
788e7a89 2411 return -EAGAIN;
1da177e4 2412 }
4f9838c7 2413 if (task->tk_status >= 0) {
1da177e4 2414 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2415 nfs_post_op_update_inode(inode, data->res.fattr);
2416 }
788e7a89 2417 return 0;
1da177e4
LT		 2418}
2419
788e7a89 2420static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2421{
1da177e4
LT		 2422 struct rpc_message msg = {
2423 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2424 .rpc_argp = &data->args,
2425 .rpc_resp = &data->res,
2426 .rpc_cred = data->cred,
2427 };
2428 struct inode *inode = data->inode;
4f9838c7 2429 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2430 int stable;
1da177e4
LT		 2431
2432 if (how & FLUSH_STABLE) {
2433 if (!NFS_I(inode)->ncommit)
2434 stable = NFS_FILE_SYNC;
2435 else
2436 stable = NFS_DATA_SYNC;
2437 } else
2438 stable = NFS_UNSTABLE;
2439 data->args.stable = stable;
4f9838c7
TM		 2440 data->args.bitmask = server->attr_bitmask;
2441 data->res.server = server;
1da177e4
LT		 2442
2443 data->timestamp = jiffies;
2444
1da177e4 2445 /* Finalize the task. */
788e7a89 2446 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2447}
2448
788e7a89 2449static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2450{
1da177e4
LT		 2451 struct inode *inode = data->inode;
2452
2453 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2454 rpc_restart_call(task);
788e7a89 2455 return -EAGAIN;
1da177e4 2456 }
4f9838c7
TM		 2457 if (task->tk_status >= 0)
2458 nfs_post_op_update_inode(inode, data->res.fattr);
788e7a89 2459 return 0;
1da177e4
LT		 2460}
2461
788e7a89 2462static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2463{
1da177e4
LT		 2464 struct rpc_message msg = {
2465 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2466 .rpc_argp = &data->args,
2467 .rpc_resp = &data->res,
2468 .rpc_cred = data->cred,
2469 };
788e7a89 2470 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2471
4f9838c7
TM		 2472 data->args.bitmask = server->attr_bitmask;
2473 data->res.server = server;
2474
788e7a89 2475 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2476}
2477
2478/*
2479 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2480 * standalone procedure for queueing an asynchronous RENEW.
2481 */
963d8fe5 2482static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2483{
adfa6f98 2484 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2485 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2486
2487 if (task->tk_status < 0) {
2488 switch (task->tk_status) {
2489 case -NFS4ERR_STALE_CLIENTID:
2490 case -NFS4ERR_EXPIRED:
2491 case -NFS4ERR_CB_PATH_DOWN:
2492 nfs4_schedule_state_recovery(clp);
2493 }
2494 return;
2495 }
2496 spin_lock(&clp->cl_lock);
2497 if (time_before(clp->cl_last_renewal,timestamp))
2498 clp->cl_last_renewal = timestamp;
2499 spin_unlock(&clp->cl_lock);
2500}
2501
963d8fe5
TM		 2502static const struct rpc_call_ops nfs4_renew_ops = {
2503 .rpc_call_done = nfs4_renew_done,
2504};
2505
adfa6f98 2506int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2507{
2508 struct rpc_message msg = {
2509 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2510 .rpc_argp = clp,
b4454fe1 2511 .rpc_cred = cred,
1da177e4
LT		 2512 };
2513
2514 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2515 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2516}
2517
adfa6f98 2518int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2519{
2520 struct rpc_message msg = {
2521 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2522 .rpc_argp = clp,
b4454fe1 2523 .rpc_cred = cred,
1da177e4
LT		 2524 };
2525 unsigned long now = jiffies;
2526 int status;
2527
2528 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2529 if (status < 0)
2530 return status;
2531 spin_lock(&clp->cl_lock);
2532 if (time_before(clp->cl_last_renewal,now))
2533 clp->cl_last_renewal = now;
2534 spin_unlock(&clp->cl_lock);
2535 return 0;
2536}
2537
aa1870af
BF		 2538static inline int nfs4_server_supports_acls(struct nfs_server *server)
2539{
2540 return (server->caps & NFS_CAP_ACLS)
2541 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2542 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2543}
2544
2545/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2546 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2547 * the stack.
2548 */
2549#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2550
2551static void buf_to_pages(const void *buf, size_t buflen,
2552 struct page **pages, unsigned int *pgbase)
2553{
2554 const void *p = buf;
2555
2556 *pgbase = offset_in_page(buf);
2557 p -= *pgbase;
2558 while (p < buf + buflen) {
2559 *(pages++) = virt_to_page(p);
2560 p += PAGE_CACHE_SIZE;
2561 }
2562}
2563
e50a1c2e
BF		 2564struct nfs4_cached_acl {
2565 int cached;
2566 size_t len;
3e9d4154 2567 char data[0];
e50a1c2e
BF		 2568};
2569
2570static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2571{
2572 struct nfs_inode *nfsi = NFS_I(inode);
2573
2574 spin_lock(&inode->i_lock);
2575 kfree(nfsi->nfs4_acl);
2576 nfsi->nfs4_acl = acl;
2577 spin_unlock(&inode->i_lock);
2578}
2579
2580static void nfs4_zap_acl_attr(struct inode *inode)
2581{
2582 nfs4_set_cached_acl(inode, NULL);
2583}
2584
2585static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2586{
2587 struct nfs_inode *nfsi = NFS_I(inode);
2588 struct nfs4_cached_acl *acl;
2589 int ret = -ENOENT;
2590
2591 spin_lock(&inode->i_lock);
2592 acl = nfsi->nfs4_acl;
2593 if (acl == NULL)
2594 goto out;
2595 if (buf == NULL) /* user is just asking for length */
2596 goto out_len;
2597 if (acl->cached == 0)
2598 goto out;
2599 ret = -ERANGE; /* see getxattr(2) man page */
2600 if (acl->len > buflen)
2601 goto out;
2602 memcpy(buf, acl->data, acl->len);
2603out_len:
2604 ret = acl->len;
2605out:
2606 spin_unlock(&inode->i_lock);
2607 return ret;
2608}
2609
2610static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2611{
2612 struct nfs4_cached_acl *acl;
2613
2614 if (buf && acl_len <= PAGE_SIZE) {
2615 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2616 if (acl == NULL)
2617 goto out;
2618 acl->cached = 1;
2619 memcpy(acl->data, buf, acl_len);
2620 } else {
2621 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2622 if (acl == NULL)
2623 goto out;
2624 acl->cached = 0;
2625 }
2626 acl->len = acl_len;
2627out:
2628 nfs4_set_cached_acl(inode, acl);
2629}
2630
16b4289c 2631static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2632{
aa1870af
BF		 2633 struct page *pages[NFS4ACL_MAXPAGES];
2634 struct nfs_getaclargs args = {
2635 .fh = NFS_FH(inode),
2636 .acl_pages = pages,
2637 .acl_len = buflen,
2638 };
2639 size_t resp_len = buflen;
e50a1c2e 2640 void *resp_buf;
aa1870af
BF		 2641 struct rpc_message msg = {
2642 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2643 .rpc_argp = &args,
2644 .rpc_resp = &resp_len,
2645 };
e50a1c2e 2646 struct page *localpage = NULL;
aa1870af
BF		 2647 int ret;
2648
e50a1c2e
BF		 2649 if (buflen < PAGE_SIZE) {
2650 /* As long as we're doing a round trip to the server anyway,
2651 * let's be prepared for a page of acl data. */
2652 localpage = alloc_page(GFP_KERNEL);
2653 resp_buf = page_address(localpage);
2654 if (localpage == NULL)
2655 return -ENOMEM;
2656 args.acl_pages[0] = localpage;
2657 args.acl_pgbase = 0;
1d95db8e 2658 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2659 } else {
2660 resp_buf = buf;
2661 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2662 }
aa1870af 2663 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2664 if (ret)
2665 goto out_free;
2666 if (resp_len > args.acl_len)
2667 nfs4_write_cached_acl(inode, NULL, resp_len);
2668 else
2669 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2670 if (buf) {
2671 ret = -ERANGE;
2672 if (resp_len > buflen)
2673 goto out_free;
2674 if (localpage)
2675 memcpy(buf, resp_buf, resp_len);
2676 }
2677 ret = resp_len;
2678out_free:
2679 if (localpage)
2680 __free_page(localpage);
aa1870af
BF		 2681 return ret;
2682}
2683
16b4289c
TM		 2684static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2685{
2686 struct nfs4_exception exception = { };
2687 ssize_t ret;
2688 do {
2689 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2690 if (ret >= 0)
2691 break;
2692 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2693 } while (exception.retry);
2694 return ret;
2695}
2696
e50a1c2e
BF		 2697static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2698{
2699 struct nfs_server *server = NFS_SERVER(inode);
2700 int ret;
2701
2702 if (!nfs4_server_supports_acls(server))
2703 return -EOPNOTSUPP;
2704 ret = nfs_revalidate_inode(server, inode);
2705 if (ret < 0)
2706 return ret;
2707 ret = nfs4_read_cached_acl(inode, buf, buflen);
2708 if (ret != -ENOENT)
2709 return ret;
2710 return nfs4_get_acl_uncached(inode, buf, buflen);
2711}
2712
16b4289c 2713static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2714{
2715 struct nfs_server *server = NFS_SERVER(inode);
2716 struct page *pages[NFS4ACL_MAXPAGES];
2717 struct nfs_setaclargs arg = {
2718 .fh = NFS_FH(inode),
2719 .acl_pages = pages,
2720 .acl_len = buflen,
2721 };
2722 struct rpc_message msg = {
2723 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2724 .rpc_argp = &arg,
2725 .rpc_resp = NULL,
2726 };
2727 int ret;
2728
2729 if (!nfs4_server_supports_acls(server))
2730 return -EOPNOTSUPP;
642ac549 2731 nfs_inode_return_delegation(inode);
4b580ee3 2732 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2733 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
08efa202 2734 nfs_zap_caches(inode);
4b580ee3
BF		 2735 return ret;
2736}
2737
16b4289c
TM		 2738static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2739{
2740 struct nfs4_exception exception = { };
2741 int err;
2742 do {
2743 err = nfs4_handle_exception(NFS_SERVER(inode),
2744 __nfs4_proc_set_acl(inode, buf, buflen),
2745 &exception);
2746 } while (exception.retry);
2747 return err;
2748}
2749
1da177e4 2750static int
faf5f49c 2751nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2752{
7539bbab 2753 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2754
2755 if (!clp || task->tk_status >= 0)
2756 return 0;
2757 switch(task->tk_status) {
2758 case -NFS4ERR_STALE_CLIENTID:
2759 case -NFS4ERR_STALE_STATEID:
2760 case -NFS4ERR_EXPIRED:
2761 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2762 nfs4_schedule_state_recovery(clp);
433fbe4c 2763 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2764 rpc_wake_up_task(task);
2765 task->tk_status = 0;
2766 return -EAGAIN;
1da177e4 2767 case -NFS4ERR_DELAY:
006ea73e
CL		 2768 nfs_inc_server_stats((struct nfs_server *) server,
2769 NFSIOS_DELAY);
2770 case -NFS4ERR_GRACE:
1da177e4
LT		 2771 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2772 task->tk_status = 0;
2773 return -EAGAIN;
2774 case -NFS4ERR_OLD_STATEID:
2775 task->tk_status = 0;
2776 return -EAGAIN;
2777 }
2778 task->tk_status = nfs4_map_errors(task->tk_status);
2779 return 0;
2780}
2781
433fbe4c
TM		 2782static int nfs4_wait_bit_interruptible(void *word)
2783{
2784 if (signal_pending(current))
2785 return -ERESTARTSYS;
2786 schedule();
2787 return 0;
2788}
2789
adfa6f98 2790static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2791{
1da177e4 2792 sigset_t oldset;
433fbe4c 2793 int res;
1da177e4
LT		 2794
2795 might_sleep();
2796
e148582e
TM		 2797 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2798
1da177e4 2799 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2800 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2801 nfs4_wait_bit_interruptible,
2802 TASK_INTERRUPTIBLE);
1da177e4 2803 rpc_clnt_sigunmask(clnt, &oldset);
e148582e
TM		 2804
2805 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2806 return res;
2807}
2808
2809static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2810{
2811 sigset_t oldset;
2812 int res = 0;
2813
2814 might_sleep();
2815
2816 if (*timeout <= 0)
2817 *timeout = NFS4_POLL_RETRY_MIN;
2818 if (*timeout > NFS4_POLL_RETRY_MAX)
2819 *timeout = NFS4_POLL_RETRY_MAX;
2820 rpc_clnt_sigmask(clnt, &oldset);
2821 if (clnt->cl_intr) {
041e0e3b 2822 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2823 if (signalled())
2824 res = -ERESTARTSYS;
041e0e3b
NA		 2825 } else
2826 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2827 rpc_clnt_sigunmask(clnt, &oldset);
2828 *timeout <<= 1;
2829 return res;
2830}
2831
2832/* This is the error handling routine for processes that are allowed
2833 * to sleep.
2834 */
10afec90 2835static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2836{
7539bbab 2837 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2838 int ret = errorcode;
2839
2840 exception->retry = 0;
2841 switch(errorcode) {
2842 case 0:
2843 return 0;
2844 case -NFS4ERR_STALE_CLIENTID:
2845 case -NFS4ERR_STALE_STATEID:
2846 case -NFS4ERR_EXPIRED:
433fbe4c 2847 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2848 ret = nfs4_wait_clnt_recover(server->client, clp);
2849 if (ret == 0)
2850 exception->retry = 1;
2851 break;
c514983d 2852 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2853 case -NFS4ERR_GRACE:
2854 case -NFS4ERR_DELAY:
2855 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2856 if (ret != 0)
2857 break;
1da177e4 2858 case -NFS4ERR_OLD_STATEID:
2c56617d 2859 exception->retry = 1;
1da177e4
LT		 2860 }
2861 /* We failed to handle the error */
2862 return nfs4_map_errors(ret);
2863}
2864
adfa6f98 2865int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2866{
2867 nfs4_verifier sc_verifier;
2868 struct nfs4_setclientid setclientid = {
2869 .sc_verifier = &sc_verifier,
2870 .sc_prog = program,
2871 };
2872 struct rpc_message msg = {
2873 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2874 .rpc_argp = &setclientid,
2875 .rpc_resp = clp,
286d7d6a 2876 .rpc_cred = cred,
1da177e4 2877 };
bc4785cd 2878 __be32 *p;
1da177e4
LT		 2879 int loop = 0;
2880 int status;
2881
bc4785cd 2882 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2883 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2884 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2885
2886 for(;;) {
2887 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2888 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2889 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2890 cred->cr_ops->cr_name,
1da177e4
LT		 2891 clp->cl_id_uniquifier);
2892 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2893 sizeof(setclientid.sc_netid), "tcp");
2894 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2895 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2896 clp->cl_ipaddr, port >> 8, port & 255);
2897
2898 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2899 if (status != -NFS4ERR_CLID_INUSE)
2900 break;
2901 if (signalled())
2902 break;
2903 if (loop++ & 1)
2904 ssleep(clp->cl_lease_time + 1);
2905 else
2906 if (++clp->cl_id_uniquifier == 0)
2907 break;
2908 }
2909 return status;
2910}
2911
adfa6f98 2912static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2913{
2914 struct nfs_fsinfo fsinfo;
2915 struct rpc_message msg = {
2916 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2917 .rpc_argp = clp,
2918 .rpc_resp = &fsinfo,
286d7d6a 2919 .rpc_cred = cred,
1da177e4
LT		 2920 };
2921 unsigned long now;
2922 int status;
2923
2924 now = jiffies;
2925 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2926 if (status == 0) {
2927 spin_lock(&clp->cl_lock);
2928 clp->cl_lease_time = fsinfo.lease_time * HZ;
2929 clp->cl_last_renewal = now;
58d9714a 2930 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2931 spin_unlock(&clp->cl_lock);
2932 }
2933 return status;
2934}
2935
adfa6f98 2936int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2937{
2938 long timeout;
2939 int err;
2940 do {
2941 err = _nfs4_proc_setclientid_confirm(clp, cred);
2942 switch (err) {
2943 case 0:
2944 return err;
2945 case -NFS4ERR_RESOURCE:
2946 /* The IBM lawyers misread another document! */
2947 case -NFS4ERR_DELAY:
2948 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2949 }
2950 } while (err == 0);
2951 return err;
2952}
2953
fe650407
TM		 2954struct nfs4_delegreturndata {
2955 struct nfs4_delegreturnargs args;
fa178f29 2956 struct nfs4_delegreturnres res;
fe650407
TM		 2957 struct nfs_fh fh;
2958 nfs4_stateid stateid;
2959 struct rpc_cred *cred;
26e976a8 2960 unsigned long timestamp;
fa178f29 2961 struct nfs_fattr fattr;
fe650407
TM		 2962 int rpc_status;
2963};
2964
2965static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 2966{
fe650407 2967 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 2968 struct rpc_message msg = {
2969 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 2970 .rpc_argp = &data->args,
fa178f29 2971 .rpc_resp = &data->res,
fe650407 2972 .rpc_cred = data->cred,
1da177e4 2973 };
fa178f29 2974 nfs_fattr_init(data->res.fattr);
fe650407
TM		 2975 rpc_call_setup(task, &msg, 0);
2976}
1da177e4 2977
fe650407
TM		 2978static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2979{
2980 struct nfs4_delegreturndata *data = calldata;
2981 data->rpc_status = task->tk_status;
26e976a8 2982 if (data->rpc_status == 0)
fa178f29 2983 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2984}
2985
2986static void nfs4_delegreturn_release(void *calldata)
2987{
2988 struct nfs4_delegreturndata *data = calldata;
2989
2990 put_rpccred(data->cred);
2991 kfree(calldata);
2992}
2993
c8d149f3 2994static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 2995 .rpc_call_prepare = nfs4_delegreturn_prepare,
2996 .rpc_call_done = nfs4_delegreturn_done,
2997 .rpc_release = nfs4_delegreturn_release,
2998};
2999
3000static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3001{
3002 struct nfs4_delegreturndata *data;
fa178f29 3003 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 3004 struct rpc_task *task;
3005 int status;
3006
3007 data = kmalloc(sizeof(*data), GFP_KERNEL);
3008 if (data == NULL)
3009 return -ENOMEM;
3010 data->args.fhandle = &data->fh;
3011 data->args.stateid = &data->stateid;
fa178f29 3012 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3013 nfs_copy_fh(&data->fh, NFS_FH(inode));
3014 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3015 data->res.fattr = &data->fattr;
3016 data->res.server = server;
fe650407 3017 data->cred = get_rpccred(cred);
26e976a8 3018 data->timestamp = jiffies;
fe650407
TM		 3019 data->rpc_status = 0;
3020
3021 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 3022 if (IS_ERR(task))
fe650407 3023 return PTR_ERR(task);
fe650407 3024 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 3025 if (status == 0) {
fe650407 3026 status = data->rpc_status;
fa178f29
TM		 3027 if (status == 0)
3028 nfs_post_op_update_inode(inode, &data->fattr);
3029 }
e6b3c4db 3030 rpc_put_task(task);
fe650407 3031 return status;
1da177e4
LT		 3032}
3033
3034int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3035{
3036 struct nfs_server *server = NFS_SERVER(inode);
3037 struct nfs4_exception exception = { };
3038 int err;
3039 do {
3040 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3041 switch (err) {
3042 case -NFS4ERR_STALE_STATEID:
3043 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3044 case 0:
3045 return 0;
3046 }
3047 err = nfs4_handle_exception(server, err, &exception);
3048 } while (exception.retry);
3049 return err;
3050}
3051
3052#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3053#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3054
3055/*
3056 * sleep, with exponential backoff, and retry the LOCK operation.
3057 */
3058static unsigned long
3059nfs4_set_lock_task_retry(unsigned long timeout)
3060{
041e0e3b 3061 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3062 timeout <<= 1;
3063 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3064 return NFS4_LOCK_MAXTIMEOUT;
3065 return timeout;
3066}
3067
1da177e4
LT		 3068static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3069{
3070 struct inode *inode = state->inode;
3071 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3072 struct nfs_client *clp = server->nfs_client;
911d1aaf 3073 struct nfs_lockt_args arg = {
1da177e4 3074 .fh = NFS_FH(inode),
911d1aaf 3075 .fl = request,
1da177e4 3076 };
911d1aaf
TM		 3077 struct nfs_lockt_res res = {
3078 .denied = request,
1da177e4
LT		 3079 };
3080 struct rpc_message msg = {
3081 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3082 .rpc_argp = &arg,
3083 .rpc_resp = &res,
3084 .rpc_cred = state->owner->so_cred,
3085 };
1da177e4
LT		 3086 struct nfs4_lock_state *lsp;
3087 int status;
3088
3089 down_read(&clp->cl_sem);
911d1aaf 3090 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3091 status = nfs4_set_lock_state(state, request);
3092 if (status != 0)
3093 goto out;
3094 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3095 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3096 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3097 switch (status) {
3098 case 0:
3099 request->fl_type = F_UNLCK;
3100 break;
3101 case -NFS4ERR_DENIED:
3102 status = 0;
1da177e4 3103 }
70cc6487 3104 request->fl_ops->fl_release_private(request);
8d0a8a9d 3105out:
1da177e4
LT		 3106 up_read(&clp->cl_sem);
3107 return status;
3108}
3109
3110static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3111{
3112 struct nfs4_exception exception = { };
3113 int err;
3114
3115 do {
3116 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3117 _nfs4_proc_getlk(state, cmd, request),
3118 &exception);
3119 } while (exception.retry);
3120 return err;
3121}
3122
3123static int do_vfs_lock(struct file *file, struct file_lock *fl)
3124{
3125 int res = 0;
3126 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3127 case FL_POSIX:
3128 res = posix_lock_file_wait(file, fl);
3129 break;
3130 case FL_FLOCK:
3131 res = flock_lock_file_wait(file, fl);
3132 break;
3133 default:
3134 BUG();
3135 }
1da177e4
LT		 3136 return res;
3137}
3138
faf5f49c 3139struct nfs4_unlockdata {
911d1aaf
TM		 3140 struct nfs_locku_args arg;
3141 struct nfs_locku_res res;
faf5f49c
TM		 3142 struct nfs4_lock_state *lsp;
3143 struct nfs_open_context *ctx;
911d1aaf
TM		 3144 struct file_lock fl;
3145 const struct nfs_server *server;
26e976a8 3146 unsigned long timestamp;
faf5f49c
TM		 3147};
3148
911d1aaf
TM		 3149static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3150 struct nfs_open_context *ctx,
3151 struct nfs4_lock_state *lsp,
3152 struct nfs_seqid *seqid)
3153{
3154 struct nfs4_unlockdata *p;
3155 struct inode *inode = lsp->ls_state->inode;
3156
3157 p = kmalloc(sizeof(*p), GFP_KERNEL);
3158 if (p == NULL)
3159 return NULL;
3160 p->arg.fh = NFS_FH(inode);
3161 p->arg.fl = &p->fl;
3162 p->arg.seqid = seqid;
3163 p->arg.stateid = &lsp->ls_stateid;
3164 p->lsp = lsp;
3165 atomic_inc(&lsp->ls_count);
3166 /* Ensure we don't close file until we're done freeing locks! */
3167 p->ctx = get_nfs_open_context(ctx);
3168 memcpy(&p->fl, fl, sizeof(p->fl));
3169 p->server = NFS_SERVER(inode);
3170 return p;
3171}
3172
06f814a3 3173static void nfs4_locku_release_calldata(void *data)
faf5f49c 3174{
963d8fe5 3175 struct nfs4_unlockdata *calldata = data;
911d1aaf 3176 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3177 nfs4_put_lock_state(calldata->lsp);
3178 put_nfs_open_context(calldata->ctx);
3179 kfree(calldata);
faf5f49c
TM		 3180}
3181
963d8fe5 3182static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3183{
963d8fe5 3184 struct nfs4_unlockdata *calldata = data;
faf5f49c 3185
06f814a3
TM		 3186 if (RPC_ASSASSINATED(task))
3187 return;
911d1aaf 3188 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3189 switch (task->tk_status) {
3190 case 0:
3191 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3192 calldata->res.stateid.data,
faf5f49c 3193 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3194 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3195 break;
3196 case -NFS4ERR_STALE_STATEID:
3197 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3198 break;
3199 default:
a6a352e9 3200 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3201 rpc_restart_call(task);
faf5f49c 3202 }
faf5f49c
TM		 3203}
3204
4ce70ada 3205static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3206{
4ce70ada 3207 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3208 struct rpc_message msg = {
3209 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3210 .rpc_argp = &calldata->arg,
3211 .rpc_resp = &calldata->res,
3212 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3213 };
faf5f49c 3214
911d1aaf 3215 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3216 return;
3217 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3218 /* Note: exit _without_ running nfs4_locku_done */
3219 task->tk_action = NULL;
faf5f49c
TM		 3220 return;
3221 }
26e976a8 3222 calldata->timestamp = jiffies;
faf5f49c
TM		 3223 rpc_call_setup(task, &msg, 0);
3224}
3225
963d8fe5 3226static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3227 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3228 .rpc_call_done = nfs4_locku_done,
06f814a3 3229 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3230};
3231
a5d16a4d
TM		 3232static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3233 struct nfs_open_context *ctx,
3234 struct nfs4_lock_state *lsp,
3235 struct nfs_seqid *seqid)
3236{
3237 struct nfs4_unlockdata *data;
a5d16a4d 3238
137d6aca
FF		 3239 /* Ensure this is an unlock - when canceling a lock, the
3240 * canceled lock is passed in, and it won't be an unlock.
3241 */
3242 fl->fl_type = F_UNLCK;
3243
a5d16a4d
TM		 3244 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3245 if (data == NULL) {
3246 nfs_free_seqid(seqid);
3247 return ERR_PTR(-ENOMEM);
3248 }
3249
7a1218a2 3250 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3251}
3252
faf5f49c
TM		 3253static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3254{
911d1aaf 3255 struct nfs_seqid *seqid;
1da177e4 3256 struct nfs4_lock_state *lsp;
06f814a3
TM		 3257 struct rpc_task *task;
3258 int status = 0;
faf5f49c 3259
8d0a8a9d 3260 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3261 /* Unlock _before_ we do the RPC call */
3262 request->fl_flags |= FL_EXISTS;
3263 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3264 goto out;
8d0a8a9d 3265 if (status != 0)
9b073574
TM		 3266 goto out;
3267 /* Is this a delegated lock? */
3268 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3269 goto out;
8d0a8a9d 3270 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3271 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3272 status = -ENOMEM;
911d1aaf 3273 if (seqid == NULL)
9b073574 3274 goto out;
cd3758e3 3275 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3276 status = PTR_ERR(task);
3277 if (IS_ERR(task))
9b073574 3278 goto out;
a5d16a4d 3279 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3280 rpc_put_task(task);
9b073574 3281out:
1da177e4
LT		 3282 return status;
3283}
3284
a5d16a4d
TM		 3285struct nfs4_lockdata {
3286 struct nfs_lock_args arg;
3287 struct nfs_lock_res res;
3288 struct nfs4_lock_state *lsp;
3289 struct nfs_open_context *ctx;
3290 struct file_lock fl;
26e976a8 3291 unsigned long timestamp;
a5d16a4d
TM		 3292 int rpc_status;
3293 int cancelled;
3294};
3295
3296static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3297 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3298{
a5d16a4d
TM		 3299 struct nfs4_lockdata *p;
3300 struct inode *inode = lsp->ls_state->inode;
1da177e4 3301 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3302
3303 p = kzalloc(sizeof(*p), GFP_KERNEL);
3304 if (p == NULL)
3305 return NULL;
3306
3307 p->arg.fh = NFS_FH(inode);
3308 p->arg.fl = &p->fl;
3309 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3310 if (p->arg.lock_seqid == NULL)
3311 goto out_free;
3312 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3313 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3314 p->arg.lock_owner.id = lsp->ls_id.id;
a5d16a4d
TM		 3315 p->lsp = lsp;
3316 atomic_inc(&lsp->ls_count);
3317 p->ctx = get_nfs_open_context(ctx);
3318 memcpy(&p->fl, fl, sizeof(p->fl));
3319 return p;
3320out_free:
3321 kfree(p);
3322 return NULL;
3323}
3324
3325static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3326{
3327 struct nfs4_lockdata *data = calldata;
3328 struct nfs4_state *state = data->lsp->ls_state;
3329 struct nfs4_state_owner *sp = state->owner;
1da177e4 3330 struct rpc_message msg = {
a5d16a4d
TM		 3331 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3332 .rpc_argp = &data->arg,
3333 .rpc_resp = &data->res,
3334 .rpc_cred = sp->so_cred,
1da177e4 3335 };
06735b34 3336
a5d16a4d
TM		 3337 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3338 return;
3339 dprintk("%s: begin!\n", __FUNCTION__);
3340 /* Do we need to do an open_to_lock_owner? */
3341 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3342 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3343 if (data->arg.open_seqid == NULL) {
3344 data->rpc_status = -ENOMEM;
3345 task->tk_action = NULL;
06735b34 3346 goto out;
8d0a8a9d 3347 }
a5d16a4d
TM		 3348 data->arg.open_stateid = &state->stateid;
3349 data->arg.new_lock_owner = 1;
3350 }
26e976a8 3351 data->timestamp = jiffies;
a5d16a4d 3352 rpc_call_setup(task, &msg, 0);
06735b34 3353out:
a5d16a4d
TM		 3354 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3355}
3356
3357static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3358{
3359 struct nfs4_lockdata *data = calldata;
3360
3361 dprintk("%s: begin!\n", __FUNCTION__);
3362
3363 data->rpc_status = task->tk_status;
3364 if (RPC_ASSASSINATED(task))
3365 goto out;
3366 if (data->arg.new_lock_owner != 0) {
3367 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3368 if (data->rpc_status == 0)
3369 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3370 else
3371 goto out;
3372 }
3373 if (data->rpc_status == 0) {
3374 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3375 sizeof(data->lsp->ls_stateid.data));
3376 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3377 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3378 }
3379 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3380out:
3381 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3382}
3383
3384static void nfs4_lock_release(void *calldata)
3385{
3386 struct nfs4_lockdata *data = calldata;
3387
3388 dprintk("%s: begin!\n", __FUNCTION__);
3389 if (data->arg.open_seqid != NULL)
3390 nfs_free_seqid(data->arg.open_seqid);
3391 if (data->cancelled != 0) {
3392 struct rpc_task *task;
3393 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3394 data->arg.lock_seqid);
3395 if (!IS_ERR(task))
e6b3c4db 3396 rpc_put_task(task);
a5d16a4d
TM		 3397 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3398 } else
3399 nfs_free_seqid(data->arg.lock_seqid);
3400 nfs4_put_lock_state(data->lsp);
3401 put_nfs_open_context(data->ctx);
3402 kfree(data);
3403 dprintk("%s: done!\n", __FUNCTION__);
3404}
3405
3406static const struct rpc_call_ops nfs4_lock_ops = {
3407 .rpc_call_prepare = nfs4_lock_prepare,
3408 .rpc_call_done = nfs4_lock_done,
3409 .rpc_release = nfs4_lock_release,
3410};
3411
3412static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3413{
3414 struct nfs4_lockdata *data;
3415 struct rpc_task *task;
3416 int ret;
3417
3418 dprintk("%s: begin!\n", __FUNCTION__);
cd3758e3 3419 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3420 fl->fl_u.nfs4_fl.owner);
3421 if (data == NULL)
3422 return -ENOMEM;
3423 if (IS_SETLKW(cmd))
3424 data->arg.block = 1;
3425 if (reclaim != 0)
3426 data->arg.reclaim = 1;
3427 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3428 &nfs4_lock_ops, data);
7a1218a2 3429 if (IS_ERR(task))
a5d16a4d 3430 return PTR_ERR(task);
a5d16a4d
TM		 3431 ret = nfs4_wait_for_completion_rpc_task(task);
3432 if (ret == 0) {
3433 ret = data->rpc_status;
3434 if (ret == -NFS4ERR_DENIED)
3435 ret = -EAGAIN;
3436 } else
3437 data->cancelled = 1;
e6b3c4db 3438 rpc_put_task(task);
a5d16a4d
TM		 3439 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3440 return ret;
1da177e4
LT		 3441}
3442
3443static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3444{
202b50dc
TM		 3445 struct nfs_server *server = NFS_SERVER(state->inode);
3446 struct nfs4_exception exception = { };
3447 int err;
3448
3449 do {
42a2d13e
TM		 3450 /* Cache the lock if possible... */
3451 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3452 return 0;
202b50dc
TM		 3453 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3454 if (err != -NFS4ERR_DELAY)
3455 break;
3456 nfs4_handle_exception(server, err, &exception);
3457 } while (exception.retry);
3458 return err;
1da177e4
LT		 3459}
3460
3461static int nfs4_lock_expired(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
6bfc93ef
TM		 3467 err = nfs4_set_lock_state(state, request);
3468 if (err != 0)
3469 return err;
202b50dc 3470 do {
42a2d13e
TM		 3471 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3472 return 0;
202b50dc
TM		 3473 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3474 if (err != -NFS4ERR_DELAY)
3475 break;
3476 nfs4_handle_exception(server, err, &exception);
3477 } while (exception.retry);
3478 return err;
1da177e4
LT		 3479}
3480
3481static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3482{
adfa6f98 3483 struct nfs_client *clp = state->owner->so_client;
01c3b861 3484 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3485 int status;
3486
6bfc93ef 3487 /* Is this a delegated open? */
6bfc93ef
TM		 3488 status = nfs4_set_lock_state(state, request);
3489 if (status != 0)
3490 goto out;
01c3b861
TM		 3491 request->fl_flags |= FL_ACCESS;
3492 status = do_vfs_lock(request->fl_file, request);
3493 if (status < 0)
3494 goto out;
3495 down_read(&clp->cl_sem);
3496 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3497 struct nfs_inode *nfsi = NFS_I(state->inode);
3498 /* Yes: cache locks! */
3499 down_read(&nfsi->rwsem);
3500 /* ...but avoid races with delegation recall... */
3501 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3502 request->fl_flags = fl_flags & ~FL_SLEEP;
3503 status = do_vfs_lock(request->fl_file, request);
3504 up_read(&nfsi->rwsem);
3505 goto out_unlock;
3506 }
3507 up_read(&nfsi->rwsem);
3508 }
6bfc93ef
TM		 3509 status = _nfs4_do_setlk(state, cmd, request, 0);
3510 if (status != 0)
01c3b861 3511 goto out_unlock;
6bfc93ef 3512 /* Note: we always want to sleep here! */
01c3b861 3513 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3514 if (do_vfs_lock(request->fl_file, request) < 0)
3515 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3516out_unlock:
1da177e4 3517 up_read(&clp->cl_sem);
01c3b861
TM		 3518out:
3519 request->fl_flags = fl_flags;
1da177e4
LT		 3520 return status;
3521}
3522
3523static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3524{
3525 struct nfs4_exception exception = { };
3526 int err;
3527
3528 do {
3529 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3530 _nfs4_proc_setlk(state, cmd, request),
3531 &exception);
3532 } while (exception.retry);
3533 return err;
3534}
3535
3536static int
3537nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3538{
3539 struct nfs_open_context *ctx;
3540 struct nfs4_state *state;
3541 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3542 int status;
3543
3544 /* verify open state */
cd3758e3 3545 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3546 state = ctx->state;
3547
3548 if (request->fl_start < 0 || request->fl_end < 0)
3549 return -EINVAL;
3550
3551 if (IS_GETLK(cmd))
3552 return nfs4_proc_getlk(state, F_GETLK, request);
3553
3554 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3555 return -EINVAL;
3556
3557 if (request->fl_type == F_UNLCK)
3558 return nfs4_proc_unlck(state, cmd, request);
3559
3560 do {
3561 status = nfs4_proc_setlk(state, cmd, request);
3562 if ((status != -EAGAIN) || IS_SETLK(cmd))
3563 break;
3564 timeout = nfs4_set_lock_task_retry(timeout);
3565 status = -ERESTARTSYS;
3566 if (signalled())
3567 break;
3568 } while(status < 0);
1da177e4
LT		 3569 return status;
3570}
3571
888e694c
TM		 3572int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3573{
3574 struct nfs_server *server = NFS_SERVER(state->inode);
3575 struct nfs4_exception exception = { };
3576 int err;
3577
3578 err = nfs4_set_lock_state(state, fl);
3579 if (err != 0)
3580 goto out;
3581 do {
3582 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3583 if (err != -NFS4ERR_DELAY)
3584 break;
3585 err = nfs4_handle_exception(server, err, &exception);
3586 } while (exception.retry);
3587out:
3588 return err;
3589}
6b3b5496 3590
aa1870af
BF		 3591#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3592
6b3b5496
BF		 3593int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3594 size_t buflen, int flags)
3595{
4b580ee3
BF		 3596 struct inode *inode = dentry->d_inode;
3597
3598 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3599 return -EOPNOTSUPP;
3600
3601 if (!S_ISREG(inode->i_mode) &&
3602 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3603 return -EPERM;
3604
3605 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3606}
3607
3608/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3609 * and that's what we'll do for e.g. user attributes that haven't been set.
3610 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3611 * attributes in kernel-managed attribute namespaces. */
3612ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3613 size_t buflen)
3614{
aa1870af
BF		 3615 struct inode *inode = dentry->d_inode;
3616
3617 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3618 return -EOPNOTSUPP;
3619
3620 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3621}
3622
3623ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3624{
aa1870af 3625 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3626
096455a2
BF		 3627 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3628 return 0;
6b3b5496
BF		 3629 if (buf && buflen < len)
3630 return -ERANGE;
3631 if (buf)
aa1870af
BF		 3632 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3633 return len;
6b3b5496
BF		 3634}
3635
56659e99 3636int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3637 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3638{
3639 struct nfs_server *server = NFS_SERVER(dir);
3640 u32 bitmask[2] = {
361e624f
MN		 3641 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3642 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3643 };
3644 struct nfs4_fs_locations_arg args = {
3645 .dir_fh = NFS_FH(dir),
c228fd3a 3646 .name = name,
683b57b4
TM		 3647 .page = page,
3648 .bitmask = bitmask,
3649 };
3650 struct rpc_message msg = {
3651 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3652 .rpc_argp = &args,
7aaa0b3b 3653 .rpc_resp = fs_locations,
683b57b4
TM		 3654 };
3655 int status;
3656
3657 dprintk("%s: start\n", __FUNCTION__);
c228fd3a 3658 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3659 fs_locations->server = server;
830b8e33 3660 fs_locations->nlocations = 0;
683b57b4
TM		 3661 status = rpc_call_sync(server->client, &msg, 0);
3662 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3663 return status;
3664}
3665
1da177e4
LT		 3666struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3667 .recover_open = nfs4_open_reclaim,
3668 .recover_lock = nfs4_lock_reclaim,
3669};
3670
3671struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3672 .recover_open = nfs4_open_expired,
3673 .recover_lock = nfs4_lock_expired,
3674};
3675
92e1d5be 3676static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3677 .permission = nfs_permission,
3678 .getattr = nfs_getattr,
3679 .setattr = nfs_setattr,
3680 .getxattr = nfs4_getxattr,
3681 .setxattr = nfs4_setxattr,
3682 .listxattr = nfs4_listxattr,
3683};
3684
509de811 3685const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3686 .version = 4, /* protocol version */
3687 .dentry_ops = &nfs4_dentry_operations,
3688 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3689 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3690 .getroot = nfs4_proc_get_root,
3691 .getattr = nfs4_proc_getattr,
3692 .setattr = nfs4_proc_setattr,
2b3de441 3693 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3694 .lookup = nfs4_proc_lookup,
3695 .access = nfs4_proc_access,
3696 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3697 .create = nfs4_proc_create,
3698 .remove = nfs4_proc_remove,
3699 .unlink_setup = nfs4_proc_unlink_setup,
3700 .unlink_done = nfs4_proc_unlink_done,
3701 .rename = nfs4_proc_rename,
3702 .link = nfs4_proc_link,
3703 .symlink = nfs4_proc_symlink,
3704 .mkdir = nfs4_proc_mkdir,
3705 .rmdir = nfs4_proc_remove,
3706 .readdir = nfs4_proc_readdir,
3707 .mknod = nfs4_proc_mknod,
3708 .statfs = nfs4_proc_statfs,
3709 .fsinfo = nfs4_proc_fsinfo,
3710 .pathconf = nfs4_proc_pathconf,
e9326dca 3711 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3712 .decode_dirent = nfs4_decode_dirent,
3713 .read_setup = nfs4_proc_read_setup,
ec06c096 3714 .read_done = nfs4_read_done,
1da177e4 3715 .write_setup = nfs4_proc_write_setup,
788e7a89 3716 .write_done = nfs4_write_done,
1da177e4 3717 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3718 .commit_done = nfs4_commit_done,
02a913a7
TM		 3719 .file_open = nfs_open,
3720 .file_release = nfs_release,
1da177e4 3721 .lock = nfs4_proc_lock,
e50a1c2e 3722 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3723};
3724
3725/*
3726 * Local variables:
3727 * c-basic-offset: 8
3728 * End:
3729 */
Linux 6.x block layer and io_uring tree(s)