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SUNRPC: Allow rpc_init_task() to initialise the rpc_task->tk_msg
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
006ea73e 54#include "iostat.h"
1da177e4
LT		 55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
2066fe89 58#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
cdd4e68b 61struct nfs4_opendata;
864472e9 62static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
faf5f49c 65static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
adfa6f98 66static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
9936781d
TM		 67static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
68static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
1da177e4 69
1da177e4
LT		 70/* Prevent leaks of NFSv4 errors into userland */
71int nfs4_map_errors(int err)
72{
73 if (err < -1000) {
74 dprintk("%s could not handle NFSv4 error %d\n",
75 __FUNCTION__, -err);
76 return -EIO;
77 }
78 return err;
79}
80
81/*
82 * This is our standard bitmap for GETATTR requests.
83 */
84const u32 nfs4_fattr_bitmap[2] = {
85 FATTR4_WORD0_TYPE
86 | FATTR4_WORD0_CHANGE
87 | FATTR4_WORD0_SIZE
88 | FATTR4_WORD0_FSID
89 | FATTR4_WORD0_FILEID,
90 FATTR4_WORD1_MODE
91 | FATTR4_WORD1_NUMLINKS
92 | FATTR4_WORD1_OWNER
93 | FATTR4_WORD1_OWNER_GROUP
94 | FATTR4_WORD1_RAWDEV
95 | FATTR4_WORD1_SPACE_USED
96 | FATTR4_WORD1_TIME_ACCESS
97 | FATTR4_WORD1_TIME_METADATA
98 | FATTR4_WORD1_TIME_MODIFY
99};
100
101const u32 nfs4_statfs_bitmap[2] = {
102 FATTR4_WORD0_FILES_AVAIL
103 | FATTR4_WORD0_FILES_FREE
104 | FATTR4_WORD0_FILES_TOTAL,
105 FATTR4_WORD1_SPACE_AVAIL
106 | FATTR4_WORD1_SPACE_FREE
107 | FATTR4_WORD1_SPACE_TOTAL
108};
109
4ce79717 110const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 111 FATTR4_WORD0_MAXLINK
112 | FATTR4_WORD0_MAXNAME,
113 0
114};
115
116const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
117 | FATTR4_WORD0_MAXREAD
118 | FATTR4_WORD0_MAXWRITE
119 | FATTR4_WORD0_LEASE_TIME,
120 0
121};
122
830b8e33
MN		 123const u32 nfs4_fs_locations_bitmap[2] = {
124 FATTR4_WORD0_TYPE
125 | FATTR4_WORD0_CHANGE
126 | FATTR4_WORD0_SIZE
127 | FATTR4_WORD0_FSID
128 | FATTR4_WORD0_FILEID
129 | FATTR4_WORD0_FS_LOCATIONS,
130 FATTR4_WORD1_MODE
131 | FATTR4_WORD1_NUMLINKS
132 | FATTR4_WORD1_OWNER
133 | FATTR4_WORD1_OWNER_GROUP
134 | FATTR4_WORD1_RAWDEV
135 | FATTR4_WORD1_SPACE_USED
136 | FATTR4_WORD1_TIME_ACCESS
137 | FATTR4_WORD1_TIME_METADATA
138 | FATTR4_WORD1_TIME_MODIFY
139 | FATTR4_WORD1_MOUNTED_ON_FILEID
140};
141
bc4785cd 142static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 143 struct nfs4_readdir_arg *readdir)
144{
0dbb4c67 145 __be32 *start, *p;
1da177e4
LT		 146
147 BUG_ON(readdir->count < 80);
148 if (cookie > 2) {
b7ef1956 149 readdir->cookie = cookie;
1da177e4
LT		 150 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
151 return;
152 }
153
154 readdir->cookie = 0;
155 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
156 if (cookie == 2)
157 return;
158
159 /*
160 * NFSv4 servers do not return entries for '.' and '..'
161 * Therefore, we fake these entries here. We let '.'
162 * have cookie 0 and '..' have cookie 1. Note that
163 * when talking to the server, we always send cookie 0
164 * instead of 1 or 2.
165 */
0dbb4c67 166 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 167
168 if (cookie == 0) {
169 *p++ = xdr_one; /* next */
170 *p++ = xdr_zero; /* cookie, first word */
171 *p++ = xdr_one; /* cookie, second word */
172 *p++ = xdr_one; /* entry len */
173 memcpy(p, ".\0\0\0", 4); /* entry */
174 p++;
175 *p++ = xdr_one; /* bitmap length */
176 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
177 *p++ = htonl(8); /* attribute buffer length */
4e769b93 178 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
1da177e4
LT		 179 }
180
181 *p++ = xdr_one; /* next */
182 *p++ = xdr_zero; /* cookie, first word */
183 *p++ = xdr_two; /* cookie, second word */
184 *p++ = xdr_two; /* entry len */
185 memcpy(p, "..\0\0", 4); /* entry */
186 p++;
187 *p++ = xdr_one; /* bitmap length */
188 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
189 *p++ = htonl(8); /* attribute buffer length */
4e769b93 190 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
1da177e4
LT		 191
192 readdir->pgbase = (char *)p - (char *)start;
193 readdir->count -= readdir->pgbase;
194 kunmap_atomic(start, KM_USER0);
195}
196
26e976a8 197static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 198{
7539bbab 199 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 200 spin_lock(&clp->cl_lock);
201 if (time_before(clp->cl_last_renewal,timestamp))
202 clp->cl_last_renewal = timestamp;
203 spin_unlock(&clp->cl_lock);
204}
205
38478b24 206static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 207{
38478b24 208 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 209
38478b24 210 spin_lock(&dir->i_lock);
40d24704
TM		 211 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
212 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
213 nfsi->cache_change_attribute = jiffies;
214 nfsi->change_attr = cinfo->after;
38478b24 215 spin_unlock(&dir->i_lock);
1da177e4
LT		 216}
217
e56e0b78 218struct nfs4_opendata {
c6d00e63 219 struct kref kref;
e56e0b78
TM		 220 struct nfs_openargs o_arg;
221 struct nfs_openres o_res;
cdd4e68b
TM		 222 struct nfs_open_confirmargs c_arg;
223 struct nfs_open_confirmres c_res;
e56e0b78
TM		 224 struct nfs_fattr f_attr;
225 struct nfs_fattr dir_attr;
ad389da7 226 struct path path;
e56e0b78
TM		 227 struct dentry *dir;
228 struct nfs4_state_owner *owner;
aac00a8d 229 struct nfs4_state *state;
e56e0b78 230 struct iattr attrs;
26e976a8 231 unsigned long timestamp;
3e309914 232 unsigned int rpc_done : 1;
24ac23ab
TM		 233 int rpc_status;
234 int cancelled;
e56e0b78
TM		 235};
236
2ced46c2
TM		 237
238static void nfs4_init_opendata_res(struct nfs4_opendata *p)
239{
240 p->o_res.f_attr = &p->f_attr;
241 p->o_res.dir_attr = &p->dir_attr;
242 p->o_res.server = p->o_arg.server;
243 nfs_fattr_init(&p->f_attr);
244 nfs_fattr_init(&p->dir_attr);
245}
246
ad389da7 247static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
e56e0b78
TM		 248 struct nfs4_state_owner *sp, int flags,
249 const struct iattr *attrs)
250{
ad389da7 251 struct dentry *parent = dget_parent(path->dentry);
e56e0b78
TM		 252 struct inode *dir = parent->d_inode;
253 struct nfs_server *server = NFS_SERVER(dir);
254 struct nfs4_opendata *p;
255
256 p = kzalloc(sizeof(*p), GFP_KERNEL);
257 if (p == NULL)
258 goto err;
259 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
260 if (p->o_arg.seqid == NULL)
261 goto err_free;
ad389da7
TM		 262 p->path.mnt = mntget(path->mnt);
263 p->path.dentry = dget(path->dentry);
e56e0b78
TM		 264 p->dir = parent;
265 p->owner = sp;
266 atomic_inc(&sp->so_count);
267 p->o_arg.fh = NFS_FH(dir);
268 p->o_arg.open_flags = flags,
7539bbab 269 p->o_arg.clientid = server->nfs_client->cl_clientid;
9f958ab8 270 p->o_arg.id = sp->so_owner_id.id;
ad389da7 271 p->o_arg.name = &p->path.dentry->d_name;
e56e0b78
TM		 272 p->o_arg.server = server;
273 p->o_arg.bitmask = server->attr_bitmask;
274 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
e56e0b78
TM		 275 if (flags & O_EXCL) {
276 u32 *s = (u32 *) p->o_arg.u.verifier.data;
277 s[0] = jiffies;
278 s[1] = current->pid;
279 } else if (flags & O_CREAT) {
280 p->o_arg.u.attrs = &p->attrs;
281 memcpy(&p->attrs, attrs, sizeof(p->attrs));
282 }
cdd4e68b
TM		 283 p->c_arg.fh = &p->o_res.fh;
284 p->c_arg.stateid = &p->o_res.stateid;
285 p->c_arg.seqid = p->o_arg.seqid;
2ced46c2 286 nfs4_init_opendata_res(p);
c6d00e63 287 kref_init(&p->kref);
e56e0b78
TM		 288 return p;
289err_free:
290 kfree(p);
291err:
292 dput(parent);
293 return NULL;
294}
295
c6d00e63 296static void nfs4_opendata_free(struct kref *kref)
e56e0b78 297{
c6d00e63
TM		 298 struct nfs4_opendata *p = container_of(kref,
299 struct nfs4_opendata, kref);
300
301 nfs_free_seqid(p->o_arg.seqid);
aac00a8d
TM		 302 if (p->state != NULL)
303 nfs4_put_open_state(p->state);
c6d00e63
TM		 304 nfs4_put_state_owner(p->owner);
305 dput(p->dir);
306 dput(p->path.dentry);
307 mntput(p->path.mnt);
308 kfree(p);
309}
310
311static void nfs4_opendata_put(struct nfs4_opendata *p)
312{
313 if (p != NULL)
314 kref_put(&p->kref, nfs4_opendata_free);
e56e0b78
TM		 315}
316
06f814a3
TM		 317static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
318{
319 sigset_t oldset;
320 int ret;
321
322 rpc_clnt_sigmask(task->tk_client, &oldset);
323 ret = rpc_wait_for_completion_task(task);
324 rpc_clnt_sigunmask(task->tk_client, &oldset);
325 return ret;
326}
327
6ee41268
TM		 328static int can_open_cached(struct nfs4_state *state, int mode)
329{
330 int ret = 0;
331 switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
332 case FMODE_READ:
333 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
6ee41268
TM		 334 break;
335 case FMODE_WRITE:
336 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
6ee41268
TM		 337 break;
338 case FMODE_READ|FMODE_WRITE:
339 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
340 }
341 return ret;
342}
343
aac00a8d
TM		 344static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
345{
346 if ((delegation->type & open_flags) != open_flags)
347 return 0;
348 if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
349 return 0;
350 return 1;
351}
352
003707c7 353static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
e7616923
TM		 354{
355 switch (open_flags) {
356 case FMODE_WRITE:
357 state->n_wronly++;
358 break;
359 case FMODE_READ:
360 state->n_rdonly++;
361 break;
362 case FMODE_READ|FMODE_WRITE:
363 state->n_rdwr++;
364 }
003707c7
TM		 365 nfs4_state_set_mode_locked(state, state->state | open_flags);
366}
367
368static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
369{
370 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
371 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
372 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
373 switch (open_flags) {
374 case FMODE_READ:
375 set_bit(NFS_O_RDONLY_STATE, &state->flags);
376 break;
377 case FMODE_WRITE:
378 set_bit(NFS_O_WRONLY_STATE, &state->flags);
379 break;
380 case FMODE_READ|FMODE_WRITE:
381 set_bit(NFS_O_RDWR_STATE, &state->flags);
382 }
e7616923
TM		 383}
384
003707c7
TM		 385static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
386{
8bda4e4c 387 write_seqlock(&state->seqlock);
003707c7 388 nfs_set_open_stateid_locked(state, stateid, open_flags);
8bda4e4c 389 write_sequnlock(&state->seqlock);
003707c7
TM		 390}
391
392static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
1da177e4 393{
1da177e4 394 open_flags &= (FMODE_READ|FMODE_WRITE);
8bda4e4c
TM		 395 /*
396 * Protect the call to nfs4_state_set_mode_locked and
397 * serialise the stateid update
398 */
399 write_seqlock(&state->seqlock);
003707c7
TM		 400 if (deleg_stateid != NULL) {
401 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
402 set_bit(NFS_DELEGATED_STATE, &state->flags);
403 }
404 if (open_stateid != NULL)
405 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
8bda4e4c
TM		 406 write_sequnlock(&state->seqlock);
407 spin_lock(&state->owner->so_lock);
e7616923 408 update_open_stateflags(state, open_flags);
ec073428 409 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 410}
411
aac00a8d
TM		 412static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
413{
414 struct nfs_delegation *delegation;
415
416 rcu_read_lock();
417 delegation = rcu_dereference(NFS_I(inode)->delegation);
418 if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
419 rcu_read_unlock();
420 return;
421 }
422 rcu_read_unlock();
423 nfs_inode_return_delegation(inode);
424}
425
6ee41268 426static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
aac00a8d
TM		 427{
428 struct nfs4_state *state = opendata->state;
429 struct nfs_inode *nfsi = NFS_I(state->inode);
430 struct nfs_delegation *delegation;
431 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
432 nfs4_stateid stateid;
433 int ret = -EAGAIN;
434
435 rcu_read_lock();
436 delegation = rcu_dereference(nfsi->delegation);
aac00a8d 437 for (;;) {
6ee41268
TM		 438 if (can_open_cached(state, open_mode)) {
439 spin_lock(&state->owner->so_lock);
440 if (can_open_cached(state, open_mode)) {
441 update_open_stateflags(state, open_mode);
442 spin_unlock(&state->owner->so_lock);
443 rcu_read_unlock();
444 goto out_return_state;
445 }
446 spin_unlock(&state->owner->so_lock);
447 }
448 if (delegation == NULL)
449 break;
aac00a8d
TM		 450 if (!can_open_delegated(delegation, open_mode))
451 break;
452 /* Save the delegation */
453 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
454 rcu_read_unlock();
455 lock_kernel();
af22f94a 456 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
aac00a8d
TM		 457 unlock_kernel();
458 if (ret != 0)
459 goto out;
460 ret = -EAGAIN;
461 rcu_read_lock();
462 delegation = rcu_dereference(nfsi->delegation);
6ee41268 463 /* If no delegation, try a cached open */
aac00a8d 464 if (delegation == NULL)
6ee41268 465 continue;
aac00a8d
TM		 466 /* Is the delegation still valid? */
467 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
468 continue;
469 rcu_read_unlock();
470 update_open_stateid(state, NULL, &stateid, open_mode);
471 goto out_return_state;
472 }
aac00a8d
TM		 473 rcu_read_unlock();
474out:
475 return ERR_PTR(ret);
476out_return_state:
477 atomic_inc(&state->count);
478 return state;
479}
480
24ac23ab
TM		 481static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
482{
483 struct inode *inode;
484 struct nfs4_state *state = NULL;
003707c7
TM		 485 struct nfs_delegation *delegation;
486 nfs4_stateid *deleg_stateid = NULL;
1b370bc2 487 int ret;
24ac23ab 488
aac00a8d 489 if (!data->rpc_done) {
6ee41268 490 state = nfs4_try_open_cached(data);
aac00a8d
TM		 491 goto out;
492 }
493
1b370bc2 494 ret = -EAGAIN;
24ac23ab 495 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1b370bc2 496 goto err;
24ac23ab 497 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1b370bc2 498 ret = PTR_ERR(inode);
03f28e3a 499 if (IS_ERR(inode))
1b370bc2
TM		 500 goto err;
501 ret = -ENOMEM;
24ac23ab
TM		 502 state = nfs4_get_open_state(inode, data->owner);
503 if (state == NULL)
1b370bc2 504 goto err_put_inode;
549d6ed5 505 if (data->o_res.delegation_type != 0) {
549d6ed5
TM		 506 int delegation_flags = 0;
507
003707c7
TM		 508 rcu_read_lock();
509 delegation = rcu_dereference(NFS_I(inode)->delegation);
510 if (delegation)
511 delegation_flags = delegation->flags;
512 rcu_read_unlock();
549d6ed5
TM		 513 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
514 nfs_inode_set_delegation(state->inode,
515 data->owner->so_cred,
516 &data->o_res);
517 else
518 nfs_inode_reclaim_delegation(state->inode,
519 data->owner->so_cred,
520 &data->o_res);
521 }
003707c7
TM		 522 rcu_read_lock();
523 delegation = rcu_dereference(NFS_I(inode)->delegation);
524 if (delegation != NULL)
525 deleg_stateid = &delegation->stateid;
526 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
527 rcu_read_unlock();
24ac23ab 528 iput(inode);
aac00a8d 529out:
24ac23ab 530 return state;
1b370bc2
TM		 531err_put_inode:
532 iput(inode);
533err:
534 return ERR_PTR(ret);
24ac23ab
TM		 535}
536
864472e9
TM		 537static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
538{
539 struct nfs_inode *nfsi = NFS_I(state->inode);
540 struct nfs_open_context *ctx;
541
542 spin_lock(&state->inode->i_lock);
543 list_for_each_entry(ctx, &nfsi->open_files, list) {
544 if (ctx->state != state)
545 continue;
546 get_nfs_open_context(ctx);
547 spin_unlock(&state->inode->i_lock);
548 return ctx;
549 }
550 spin_unlock(&state->inode->i_lock);
551 return ERR_PTR(-ENOENT);
552}
553
6f220ed5
TM		 554static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
555{
556 struct nfs4_opendata *opendata;
557
558 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
559 if (opendata == NULL)
560 return ERR_PTR(-ENOMEM);
561 opendata->state = state;
562 atomic_inc(&state->count);
563 return opendata;
564}
565
2ced46c2 566static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
864472e9 567{
2ced46c2 568 struct nfs4_state *newstate;
864472e9
TM		 569 int ret;
570
571 opendata->o_arg.open_flags = openflags;
2ced46c2
TM		 572 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
573 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
574 nfs4_init_opendata_res(opendata);
864472e9
TM		 575 ret = _nfs4_proc_open(opendata);
576 if (ret != 0)
577 return ret;
2ced46c2 578 newstate = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 579 if (IS_ERR(newstate))
580 return PTR_ERR(newstate);
581 nfs4_close_state(&opendata->path, newstate, openflags);
2ced46c2 582 *res = newstate;
864472e9
TM		 583 return 0;
584}
585
586static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
587{
864472e9 588 struct nfs4_state *newstate;
864472e9
TM		 589 int ret;
590
591 /* memory barrier prior to reading state->n_* */
2ced46c2 592 clear_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9
TM		 593 smp_rmb();
594 if (state->n_rdwr != 0) {
2ced46c2 595 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
864472e9
TM		 596 if (ret != 0)
597 return ret;
2ced46c2
TM		 598 if (newstate != state)
599 return -ESTALE;
864472e9
TM		 600 }
601 if (state->n_wronly != 0) {
2ced46c2 602 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
864472e9
TM		 603 if (ret != 0)
604 return ret;
2ced46c2
TM		 605 if (newstate != state)
606 return -ESTALE;
864472e9
TM		 607 }
608 if (state->n_rdonly != 0) {
2ced46c2 609 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
864472e9
TM		 610 if (ret != 0)
611 return ret;
2ced46c2
TM		 612 if (newstate != state)
613 return -ESTALE;
864472e9 614 }
1ac7e2fd
TM		 615 /*
616 * We may have performed cached opens for all three recoveries.
617 * Check if we need to update the current stateid.
618 */
619 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
620 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
8bda4e4c 621 write_seqlock(&state->seqlock);
1ac7e2fd
TM		 622 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
623 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
8bda4e4c 624 write_sequnlock(&state->seqlock);
1ac7e2fd 625 }
864472e9
TM		 626 return 0;
627}
628
1da177e4
LT		 629/*
630 * OPEN_RECLAIM:
631 * reclaim state on the server after a reboot.
1da177e4 632 */
539cd03a 633static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 634{
1ac7e2fd 635 struct nfs_delegation *delegation;
864472e9
TM		 636 struct nfs4_opendata *opendata;
637 int delegation_type = 0;
1da177e4
LT		 638 int status;
639
6f220ed5
TM		 640 opendata = nfs4_open_recoverdata_alloc(ctx, state);
641 if (IS_ERR(opendata))
642 return PTR_ERR(opendata);
864472e9
TM		 643 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
644 opendata->o_arg.fh = NFS_FH(state->inode);
1ac7e2fd
TM		 645 rcu_read_lock();
646 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
647 if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
65bbf6bd 648 delegation_type = delegation->type;
1ac7e2fd 649 rcu_read_unlock();
864472e9
TM		 650 opendata->o_arg.u.delegation_type = delegation_type;
651 status = nfs4_open_recover(opendata, state);
c6d00e63 652 nfs4_opendata_put(opendata);
1da177e4
LT		 653 return status;
654}
655
539cd03a 656static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 657{
658 struct nfs_server *server = NFS_SERVER(state->inode);
659 struct nfs4_exception exception = { };
660 int err;
661 do {
539cd03a 662 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 663 if (err != -NFS4ERR_DELAY)
664 break;
665 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 666 } while (exception.retry);
667 return err;
668}
669
864472e9
TM		 670static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
671{
672 struct nfs_open_context *ctx;
673 int ret;
674
675 ctx = nfs4_state_find_open_context(state);
676 if (IS_ERR(ctx))
677 return PTR_ERR(ctx);
539cd03a 678 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 679 put_nfs_open_context(ctx);
680 return ret;
681}
682
13437e12 683static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4 684{
e56e0b78 685 struct nfs4_opendata *opendata;
864472e9 686 int ret;
1da177e4 687
6f220ed5
TM		 688 opendata = nfs4_open_recoverdata_alloc(ctx, state);
689 if (IS_ERR(opendata))
690 return PTR_ERR(opendata);
e56e0b78 691 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
13437e12 692 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
e56e0b78 693 sizeof(opendata->o_arg.u.delegation.data));
864472e9 694 ret = nfs4_open_recover(opendata, state);
c6d00e63 695 nfs4_opendata_put(opendata);
864472e9 696 return ret;
1da177e4
LT		 697}
698
13437e12 699int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1da177e4
LT		 700{
701 struct nfs4_exception exception = { };
539cd03a 702 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 703 int err;
704 do {
13437e12 705 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1da177e4
LT		 706 switch (err) {
707 case 0:
708 return err;
709 case -NFS4ERR_STALE_CLIENTID:
710 case -NFS4ERR_STALE_STATEID:
711 case -NFS4ERR_EXPIRED:
712 /* Don't recall a delegation if it was lost */
7539bbab 713 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 714 return err;
715 }
716 err = nfs4_handle_exception(server, err, &exception);
717 } while (exception.retry);
718 return err;
719}
720
cdd4e68b 721static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1da177e4 722{
cdd4e68b
TM		 723 struct nfs4_opendata *data = calldata;
724 struct rpc_message msg = {
725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
726 .rpc_argp = &data->c_arg,
727 .rpc_resp = &data->c_res,
728 .rpc_cred = data->owner->so_cred,
1da177e4 729 };
26e976a8 730 data->timestamp = jiffies;
cdd4e68b
TM		 731 rpc_call_setup(task, &msg, 0);
732}
733
734static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
735{
736 struct nfs4_opendata *data = calldata;
737
738 data->rpc_status = task->tk_status;
739 if (RPC_ASSASSINATED(task))
740 return;
26e976a8 741 if (data->rpc_status == 0) {
cdd4e68b
TM		 742 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
743 sizeof(data->o_res.stateid.data));
bb22629e 744 nfs_confirm_seqid(&data->owner->so_seqid, 0);
26e976a8 745 renew_lease(data->o_res.server, data->timestamp);
3e309914 746 data->rpc_done = 1;
26e976a8 747 }
0f9f95e0 748 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
cdd4e68b
TM		 749}
750
751static void nfs4_open_confirm_release(void *calldata)
752{
753 struct nfs4_opendata *data = calldata;
754 struct nfs4_state *state = NULL;
755
756 /* If this request hasn't been cancelled, do nothing */
757 if (data->cancelled == 0)
758 goto out_free;
759 /* In case of error, no cleanup! */
3e309914 760 if (!data->rpc_done)
cdd4e68b 761 goto out_free;
cdd4e68b 762 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 763 if (!IS_ERR(state))
4a35bd41 764 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
cdd4e68b 765out_free:
c6d00e63 766 nfs4_opendata_put(data);
cdd4e68b
TM		 767}
768
769static const struct rpc_call_ops nfs4_open_confirm_ops = {
770 .rpc_call_prepare = nfs4_open_confirm_prepare,
771 .rpc_call_done = nfs4_open_confirm_done,
772 .rpc_release = nfs4_open_confirm_release,
773};
774
775/*
776 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
777 */
778static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
779{
780 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
781 struct rpc_task *task;
c970aa85
TM		 782 struct rpc_task_setup task_setup_data = {
783 .rpc_client = server->client,
784 .callback_ops = &nfs4_open_confirm_ops,
785 .callback_data = data,
786 .flags = RPC_TASK_ASYNC,
787 };
1da177e4
LT		 788 int status;
789
c6d00e63 790 kref_get(&data->kref);
3e309914
TM		 791 data->rpc_done = 0;
792 data->rpc_status = 0;
c970aa85 793 task = rpc_run_task(&task_setup_data);
7a1218a2 794 if (IS_ERR(task))
cdd4e68b 795 return PTR_ERR(task);
cdd4e68b
TM		 796 status = nfs4_wait_for_completion_rpc_task(task);
797 if (status != 0) {
798 data->cancelled = 1;
799 smp_wmb();
800 } else
801 status = data->rpc_status;
e6b3c4db 802 rpc_put_task(task);
1da177e4
LT		 803 return status;
804}
805
24ac23ab 806static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 807{
24ac23ab
TM		 808 struct nfs4_opendata *data = calldata;
809 struct nfs4_state_owner *sp = data->owner;
1da177e4
LT		 810 struct rpc_message msg = {
811 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
24ac23ab
TM		 812 .rpc_argp = &data->o_arg,
813 .rpc_resp = &data->o_res,
1da177e4
LT		 814 .rpc_cred = sp->so_cred,
815 };
24ac23ab
TM		 816
817 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
818 return;
aac00a8d
TM		 819 /*
820 * Check if we still need to send an OPEN call, or if we can use
821 * a delegation instead.
822 */
823 if (data->state != NULL) {
824 struct nfs_delegation *delegation;
825
6ee41268
TM		 826 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
827 goto out_no_action;
aac00a8d
TM		 828 rcu_read_lock();
829 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
830 if (delegation != NULL &&
831 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
832 rcu_read_unlock();
6ee41268 833 goto out_no_action;
aac00a8d
TM		 834 }
835 rcu_read_unlock();
836 }
24ac23ab 837 /* Update sequence id. */
9f958ab8 838 data->o_arg.id = sp->so_owner_id.id;
24ac23ab 839 data->o_arg.clientid = sp->so_client->cl_clientid;
6f220ed5 840 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
864472e9 841 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
6f220ed5
TM		 842 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
843 }
26e976a8 844 data->timestamp = jiffies;
24ac23ab 845 rpc_call_setup(task, &msg, 0);
6ee41268
TM		 846 return;
847out_no_action:
848 task->tk_action = NULL;
849
24ac23ab 850}
1da177e4 851
24ac23ab
TM		 852static void nfs4_open_done(struct rpc_task *task, void *calldata)
853{
854 struct nfs4_opendata *data = calldata;
1da177e4 855
24ac23ab
TM		 856 data->rpc_status = task->tk_status;
857 if (RPC_ASSASSINATED(task))
858 return;
859 if (task->tk_status == 0) {
860 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 861 case S_IFREG:
862 break;
863 case S_IFLNK:
24ac23ab 864 data->rpc_status = -ELOOP;
6f926b5b
TM		 865 break;
866 case S_IFDIR:
24ac23ab 867 data->rpc_status = -EISDIR;
6f926b5b
TM		 868 break;
869 default:
24ac23ab 870 data->rpc_status = -ENOTDIR;
6f926b5b 871 }
26e976a8 872 renew_lease(data->o_res.server, data->timestamp);
0f9f95e0
TM		 873 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
874 nfs_confirm_seqid(&data->owner->so_seqid, 0);
6f926b5b 875 }
24ac23ab 876 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
3e309914 877 data->rpc_done = 1;
24ac23ab 878}
6f926b5b 879
24ac23ab
TM		 880static void nfs4_open_release(void *calldata)
881{
882 struct nfs4_opendata *data = calldata;
883 struct nfs4_state *state = NULL;
884
885 /* If this request hasn't been cancelled, do nothing */
886 if (data->cancelled == 0)
887 goto out_free;
888 /* In case of error, no cleanup! */
3e309914 889 if (data->rpc_status != 0 || !data->rpc_done)
24ac23ab
TM		 890 goto out_free;
891 /* In case we need an open_confirm, no cleanup! */
892 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
893 goto out_free;
24ac23ab 894 state = nfs4_opendata_to_nfs4_state(data);
1b370bc2 895 if (!IS_ERR(state))
4a35bd41 896 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
24ac23ab 897out_free:
c6d00e63 898 nfs4_opendata_put(data);
24ac23ab
TM		 899}
900
901static const struct rpc_call_ops nfs4_open_ops = {
902 .rpc_call_prepare = nfs4_open_prepare,
903 .rpc_call_done = nfs4_open_done,
904 .rpc_release = nfs4_open_release,
905};
906
907/*
908 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
909 */
910static int _nfs4_proc_open(struct nfs4_opendata *data)
911{
912 struct inode *dir = data->dir->d_inode;
913 struct nfs_server *server = NFS_SERVER(dir);
914 struct nfs_openargs *o_arg = &data->o_arg;
915 struct nfs_openres *o_res = &data->o_res;
916 struct rpc_task *task;
c970aa85
TM		 917 struct rpc_task_setup task_setup_data = {
918 .rpc_client = server->client,
919 .callback_ops = &nfs4_open_ops,
920 .callback_data = data,
921 .flags = RPC_TASK_ASYNC,
922 };
24ac23ab
TM		 923 int status;
924
c6d00e63 925 kref_get(&data->kref);
3e309914
TM		 926 data->rpc_done = 0;
927 data->rpc_status = 0;
2ced46c2 928 data->cancelled = 0;
c970aa85 929 task = rpc_run_task(&task_setup_data);
7a1218a2 930 if (IS_ERR(task))
24ac23ab 931 return PTR_ERR(task);
24ac23ab
TM		 932 status = nfs4_wait_for_completion_rpc_task(task);
933 if (status != 0) {
934 data->cancelled = 1;
935 smp_wmb();
936 } else
937 status = data->rpc_status;
e6b3c4db 938 rpc_put_task(task);
3e309914 939 if (status != 0 || !data->rpc_done)
24ac23ab
TM		 940 return status;
941
9936781d
TM		 942 if (o_res->fh.size == 0)
943 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
944
56ae19f3
TM		 945 if (o_arg->open_flags & O_CREAT) {
946 update_changeattr(dir, &o_res->cinfo);
947 nfs_post_op_update_inode(dir, o_res->dir_attr);
948 } else
949 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 950 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 951 status = _nfs4_proc_open_confirm(data);
1da177e4 952 if (status != 0)
24ac23ab 953 return status;
1da177e4
LT		 954 }
955 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
9936781d 956 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 957 return 0;
1da177e4
LT		 958}
959
10afec90 960static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 961{
7539bbab 962 struct nfs_client *clp = server->nfs_client;
6b30954e 963 int ret;
58d9714a 964
6b30954e
TM		 965 for (;;) {
966 ret = nfs4_wait_clnt_recover(server->client, clp);
967 if (ret != 0)
968 return ret;
969 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
970 break;
58d9714a 971 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 972 }
973 return 0;
58d9714a
TM		 974}
975
1da177e4
LT		 976/*
977 * OPEN_EXPIRED:
978 * reclaim state on the server after a network partition.
979 * Assumes caller holds the appropriate lock
980 */
539cd03a 981static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 982{
e56e0b78 983 struct nfs4_opendata *opendata;
864472e9 984 int ret;
1da177e4 985
6f220ed5
TM		 986 opendata = nfs4_open_recoverdata_alloc(ctx, state);
987 if (IS_ERR(opendata))
988 return PTR_ERR(opendata);
864472e9
TM		 989 ret = nfs4_open_recover(opendata, state);
990 if (ret == -ESTALE) {
991 /* Invalidate the state owner so we don't ever use it again */
539cd03a
TM		 992 nfs4_drop_state_owner(state->owner);
993 d_drop(ctx->path.dentry);
1da177e4 994 }
c6d00e63 995 nfs4_opendata_put(opendata);
864472e9 996 return ret;
1da177e4
LT		 997}
998
539cd03a 999static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 1000{
539cd03a 1001 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 1002 struct nfs4_exception exception = { };
1003 int err;
1004
1005 do {
539cd03a 1006 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 1007 if (err == -NFS4ERR_DELAY)
1008 nfs4_handle_exception(server, err, &exception);
1009 } while (exception.retry);
1010 return err;
1011}
1012
1da177e4
LT		 1013static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1014{
1da177e4 1015 struct nfs_open_context *ctx;
864472e9 1016 int ret;
1da177e4 1017
864472e9
TM		 1018 ctx = nfs4_state_find_open_context(state);
1019 if (IS_ERR(ctx))
1020 return PTR_ERR(ctx);
539cd03a 1021 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 1022 put_nfs_open_context(ctx);
1023 return ret;
1da177e4
LT		 1024}
1025
aa53ed54
JL		 1026/*
1027 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1028 * fields corresponding to attributes that were used to store the verifier.
1029 * Make sure we clobber those fields in the later setattr call
1030 */
1031static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1032{
1033 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1034 !(sattr->ia_valid & ATTR_ATIME_SET))
1035 sattr->ia_valid |= ATTR_ATIME;
1036
1037 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1038 !(sattr->ia_valid & ATTR_MTIME_SET))
1039 sattr->ia_valid |= ATTR_MTIME;
1040}
1041
1da177e4 1042/*
24ac23ab 1043 * Returns a referenced nfs4_state
1da177e4 1044 */
ad389da7 1045static 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		 1046{
1047 struct nfs4_state_owner *sp;
1048 struct nfs4_state *state = NULL;
1049 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 1050 struct nfs_client *clp = server->nfs_client;
e56e0b78 1051 struct nfs4_opendata *opendata;
aac00a8d 1052 int status;
1da177e4
LT		 1053
1054 /* Protect against reboot recovery conflicts */
1da177e4
LT		 1055 status = -ENOMEM;
1056 if (!(sp = nfs4_get_state_owner(server, cred))) {
1057 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1058 goto out_err;
1059 }
58d9714a
TM		 1060 status = nfs4_recover_expired_lease(server);
1061 if (status != 0)
b4454fe1 1062 goto err_put_state_owner;
aac00a8d
TM		 1063 if (path->dentry->d_inode != NULL)
1064 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
58d9714a
TM		 1065 down_read(&clp->cl_sem);
1066 status = -ENOMEM;
ad389da7 1067 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 1068 if (opendata == NULL)
76723de0 1069 goto err_release_rwsem;
1da177e4 1070
aac00a8d
TM		 1071 if (path->dentry->d_inode != NULL)
1072 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1073
24ac23ab 1074 status = _nfs4_proc_open(opendata);
1da177e4 1075 if (status != 0)
c6d00e63 1076 goto err_opendata_put;
1da177e4 1077
aa53ed54
JL		 1078 if (opendata->o_arg.open_flags & O_EXCL)
1079 nfs4_exclusive_attrset(opendata, sattr);
1080
24ac23ab 1081 state = nfs4_opendata_to_nfs4_state(opendata);
1b370bc2
TM		 1082 status = PTR_ERR(state);
1083 if (IS_ERR(state))
c6d00e63 1084 goto err_opendata_put;
c6d00e63 1085 nfs4_opendata_put(opendata);
1da177e4
LT		 1086 nfs4_put_state_owner(sp);
1087 up_read(&clp->cl_sem);
1088 *res = state;
1089 return 0;
c6d00e63
TM		 1090err_opendata_put:
1091 nfs4_opendata_put(opendata);
76723de0
TM		 1092err_release_rwsem:
1093 up_read(&clp->cl_sem);
e56e0b78
TM		 1094err_put_state_owner:
1095 nfs4_put_state_owner(sp);
1da177e4 1096out_err:
1da177e4
LT		 1097 *res = NULL;
1098 return status;
1099}
1100
1101
ad389da7 1102static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1103{
1104 struct nfs4_exception exception = { };
1105 struct nfs4_state *res;
1106 int status;
1107
1108 do {
ad389da7 1109 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1110 if (status == 0)
1111 break;
1112 /* NOTE: BAD_SEQID means the server and client disagree about the
1113 * book-keeping w.r.t. state-changing operations
1114 * (OPEN/CLOSE/LOCK/LOCKU...)
1115 * It is actually a sign of a bug on the client or on the server.
1116 *
1117 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1118 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1119 * have unhashed the old state_owner for us, and that we can
1120 * therefore safely retry using a new one. We should still warn
1121 * the user though...
1122 */
1123 if (status == -NFS4ERR_BAD_SEQID) {
6f43ddcc
TM		 1124 printk(KERN_WARNING "NFS: v4 server %s "
1125 " returned a bad sequence-id error!\n",
1126 NFS_SERVER(dir)->nfs_client->cl_hostname);
1da177e4
LT		 1127 exception.retry = 1;
1128 continue;
1129 }
550f5747
TM		 1130 /*
1131 * BAD_STATEID on OPEN means that the server cancelled our
1132 * state before it received the OPEN_CONFIRM.
1133 * Recover by retrying the request as per the discussion
1134 * on Page 181 of RFC3530.
1135 */
1136 if (status == -NFS4ERR_BAD_STATEID) {
1137 exception.retry = 1;
1138 continue;
1139 }
aac00a8d
TM		 1140 if (status == -EAGAIN) {
1141 /* We must have found a delegation */
1142 exception.retry = 1;
1143 continue;
1144 }
1da177e4
LT		 1145 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1146 status, &exception));
1147 } while (exception.retry);
1148 return res;
1149}
1150
3e4f6290
TM		 1151static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1152 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1153{
3e4f6290 1154 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1155 struct nfs_setattrargs arg = {
3e4f6290 1156 .fh = NFS_FH(inode),
1da177e4
LT		 1157 .iap = sattr,
1158 .server = server,
1159 .bitmask = server->attr_bitmask,
1160 };
1161 struct nfs_setattrres res = {
1162 .fattr = fattr,
1163 .server = server,
1164 };
1165 struct rpc_message msg = {
1166 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1167 .rpc_argp = &arg,
1168 .rpc_resp = &res,
1169 };
26e976a8 1170 unsigned long timestamp = jiffies;
65e4308d 1171 int status;
1da177e4 1172
0e574af1 1173 nfs_fattr_init(fattr);
1da177e4 1174
3e4f6290
TM		 1175 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1176 /* Use that stateid */
1177 } else if (state != NULL) {
1da177e4 1178 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1179 nfs4_copy_stateid(&arg.stateid, state, current->files);
1180 } else
1da177e4
LT		 1181 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1182
65e4308d 1183 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1184 if (status == 0 && state != NULL)
1185 renew_lease(server, timestamp);
65e4308d 1186 return status;
1da177e4
LT		 1187}
1188
3e4f6290
TM		 1189static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1190 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1191{
3e4f6290 1192 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1193 struct nfs4_exception exception = { };
1194 int err;
1195 do {
1196 err = nfs4_handle_exception(server,
3e4f6290 1197 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1198 &exception);
1199 } while (exception.retry);
1200 return err;
1201}
1202
1203struct nfs4_closedata {
4a35bd41 1204 struct path path;
1da177e4
LT		 1205 struct inode *inode;
1206 struct nfs4_state *state;
1207 struct nfs_closeargs arg;
1208 struct nfs_closeres res;
516a6af6 1209 struct nfs_fattr fattr;
26e976a8 1210 unsigned long timestamp;
1da177e4
LT		 1211};
1212
963d8fe5 1213static void nfs4_free_closedata(void *data)
9512135d 1214{
963d8fe5
TM		 1215 struct nfs4_closedata *calldata = data;
1216 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1217
1218 nfs4_put_open_state(calldata->state);
1219 nfs_free_seqid(calldata->arg.seqid);
9512135d 1220 nfs4_put_state_owner(sp);
4a35bd41
TM		 1221 dput(calldata->path.dentry);
1222 mntput(calldata->path.mnt);
9512135d
TM		 1223 kfree(calldata);
1224}
1225
963d8fe5 1226static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1227{
963d8fe5 1228 struct nfs4_closedata *calldata = data;
1da177e4 1229 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1230 struct nfs_server *server = NFS_SERVER(calldata->inode);
1231
4ce70ada
TM		 1232 if (RPC_ASSASSINATED(task))
1233 return;
1da177e4
LT		 1234 /* hmm. we are done with the inode, and in the process of freeing
1235 * the state_owner. we keep this around to process errors
1236 */
cee54fc9 1237 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1238 switch (task->tk_status) {
1239 case 0:
45328c35 1240 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
26e976a8 1241 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1242 break;
1243 case -NFS4ERR_STALE_STATEID:
1244 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1245 break;
1246 default:
1247 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1248 rpc_restart_call(task);
1249 return;
1250 }
1251 }
516a6af6 1252 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1253}
1254
4ce70ada 1255static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1256{
4ce70ada 1257 struct nfs4_closedata *calldata = data;
9512135d 1258 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1259 struct rpc_message msg = {
1260 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1261 .rpc_argp = &calldata->arg,
1262 .rpc_resp = &calldata->res,
9512135d 1263 .rpc_cred = state->owner->so_cred,
1da177e4 1264 };
003707c7 1265 int clear_rd, clear_wr, clear_rdwr;
9512135d 1266
963d8fe5 1267 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1268 return;
003707c7 1269
003707c7 1270 clear_rd = clear_wr = clear_rdwr = 0;
4cecb76f 1271 spin_lock(&state->owner->so_lock);
003707c7 1272 /* Calculate the change in open mode */
e7616923 1273 if (state->n_rdwr == 0) {
003707c7 1274 if (state->n_rdonly == 0) {
003707c7
TM		 1275 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1276 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1277 }
1278 if (state->n_wronly == 0) {
003707c7
TM		 1279 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1280 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1281 }
e7616923 1282 }
4cecb76f 1283 spin_unlock(&state->owner->so_lock);
003707c7 1284 if (!clear_rd && !clear_wr && !clear_rdwr) {
963d8fe5
TM		 1285 /* Note: exit _without_ calling nfs4_close_done */
1286 task->tk_action = NULL;
9512135d
TM		 1287 return;
1288 }
516a6af6 1289 nfs_fattr_init(calldata->res.fattr);
45328c35 1290 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1da177e4 1291 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
45328c35
TM		 1292 calldata->arg.open_flags = FMODE_READ;
1293 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1294 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1295 calldata->arg.open_flags = FMODE_WRITE;
1296 }
26e976a8 1297 calldata->timestamp = jiffies;
9512135d 1298 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1299}
1300
963d8fe5 1301static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1302 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1303 .rpc_call_done = nfs4_close_done,
1304 .rpc_release = nfs4_free_closedata,
1305};
1306
1da177e4
LT		 1307/*
1308 * It is possible for data to be read/written from a mem-mapped file
1309 * after the sys_close call (which hits the vfs layer as a flush).
1310 * This means that we can't safely call nfsv4 close on a file until
1311 * the inode is cleared. This in turn means that we are not good
1312 * NFSv4 citizens - we do not indicate to the server to update the file's
1313 * share state even when we are done with one of the three share
1314 * stateid's in the inode.
1315 *
1316 * NOTE: Caller must be holding the sp->so_owner semaphore!
1317 */
a49c3c77 1318int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1da177e4 1319{
4a35bd41 1320 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4 1321 struct nfs4_closedata *calldata;
b39e625b
TM		 1322 struct nfs4_state_owner *sp = state->owner;
1323 struct rpc_task *task;
c970aa85
TM		 1324 struct rpc_task_setup task_setup_data = {
1325 .rpc_client = server->client,
1326 .callback_ops = &nfs4_close_ops,
1327 .flags = RPC_TASK_ASYNC,
1328 };
9512135d 1329 int status = -ENOMEM;
1da177e4 1330
9512135d 1331 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1332 if (calldata == NULL)
9512135d 1333 goto out;
4a35bd41 1334 calldata->inode = state->inode;
1da177e4 1335 calldata->state = state;
4a35bd41 1336 calldata->arg.fh = NFS_FH(state->inode);
003707c7 1337 calldata->arg.stateid = &state->open_stateid;
1da177e4 1338 /* Serialization for the sequence id */
cee54fc9 1339 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1340 if (calldata->arg.seqid == NULL)
1341 goto out_free_calldata;
516a6af6
TM		 1342 calldata->arg.bitmask = server->attr_bitmask;
1343 calldata->res.fattr = &calldata->fattr;
1344 calldata->res.server = server;
4a35bd41
TM		 1345 calldata->path.mnt = mntget(path->mnt);
1346 calldata->path.dentry = dget(path->dentry);
9512135d 1347
c970aa85
TM		 1348 task_setup_data.callback_data = calldata;
1349 task = rpc_run_task(&task_setup_data);
b39e625b
TM		 1350 if (IS_ERR(task))
1351 return PTR_ERR(task);
a49c3c77
TM		 1352 status = 0;
1353 if (wait)
1354 status = rpc_wait_for_completion_task(task);
b39e625b 1355 rpc_put_task(task);
a49c3c77 1356 return status;
9512135d
TM		 1357out_free_calldata:
1358 kfree(calldata);
1359out:
b39e625b
TM		 1360 nfs4_put_open_state(state);
1361 nfs4_put_state_owner(sp);
9512135d 1362 return status;
1da177e4
LT		 1363}
1364
4a35bd41 1365static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
02a913a7
TM		 1366{
1367 struct file *filp;
1b45c46c 1368 int ret;
02a913a7 1369
1b45c46c
TM		 1370 /* If the open_intent is for execute, we have an extra check to make */
1371 if (nd->intent.open.flags & FMODE_EXEC) {
af22f94a 1372 ret = nfs_may_open(state->inode,
1b45c46c
TM		 1373 state->owner->so_cred,
1374 nd->intent.open.flags);
1375 if (ret < 0)
1376 goto out_close;
1377 }
4a35bd41 1378 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
02a913a7
TM		 1379 if (!IS_ERR(filp)) {
1380 struct nfs_open_context *ctx;
cd3758e3 1381 ctx = nfs_file_open_context(filp);
02a913a7 1382 ctx->state = state;
95cf959b
TM		 1383 return 0;
1384 }
1b45c46c
TM		 1385 ret = PTR_ERR(filp);
1386out_close:
a49c3c77 1387 nfs4_close_sync(path, state, nd->intent.open.flags);
1b45c46c 1388 return ret;
02a913a7
TM		 1389}
1390
1391struct dentry *
1da177e4
LT		 1392nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1393{
565277f6 1394 struct dentry *parent;
ad389da7
TM		 1395 struct path path = {
1396 .mnt = nd->mnt,
1397 .dentry = dentry,
1398 };
1da177e4
LT		 1399 struct iattr attr;
1400 struct rpc_cred *cred;
1401 struct nfs4_state *state;
02a913a7 1402 struct dentry *res;
1da177e4
LT		 1403
1404 if (nd->flags & LOOKUP_CREATE) {
1405 attr.ia_mode = nd->intent.open.create_mode;
1406 attr.ia_valid = ATTR_MODE;
1407 if (!IS_POSIXACL(dir))
1408 attr.ia_mode &= ~current->fs->umask;
1409 } else {
1410 attr.ia_valid = 0;
1411 BUG_ON(nd->intent.open.flags & O_CREAT);
1412 }
1413
1f163415 1414 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1415 if (IS_ERR(cred))
02a913a7 1416 return (struct dentry *)cred;
565277f6
TM		 1417 parent = dentry->d_parent;
1418 /* Protect against concurrent sillydeletes */
1419 nfs_block_sillyrename(parent);
ad389da7 1420 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1421 put_rpccred(cred);
02a913a7 1422 if (IS_ERR(state)) {
d75340cc 1423 if (PTR_ERR(state) == -ENOENT) {
02a913a7 1424 d_add(dentry, NULL);
d75340cc
TM		 1425 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1426 }
565277f6 1427 nfs_unblock_sillyrename(parent);
02a913a7
TM		 1428 return (struct dentry *)state;
1429 }
24ac23ab 1430 res = d_add_unique(dentry, igrab(state->inode));
02a913a7 1431 if (res != NULL)
deee9369 1432 path.dentry = res;
d75340cc 1433 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
565277f6 1434 nfs_unblock_sillyrename(parent);
4a35bd41 1435 nfs4_intent_set_file(nd, &path, state);
02a913a7 1436 return res;
1da177e4
LT		 1437}
1438
1439int
02a913a7 1440nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1441{
ad389da7
TM		 1442 struct path path = {
1443 .mnt = nd->mnt,
1444 .dentry = dentry,
1445 };
1da177e4
LT		 1446 struct rpc_cred *cred;
1447 struct nfs4_state *state;
1da177e4 1448
1f163415 1449 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1450 if (IS_ERR(cred))
1451 return PTR_ERR(cred);
aac00a8d 1452 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1453 put_rpccred(cred);
02a913a7
TM		 1454 if (IS_ERR(state)) {
1455 switch (PTR_ERR(state)) {
1456 case -EPERM:
1457 case -EACCES:
1458 case -EDQUOT:
1459 case -ENOSPC:
1460 case -EROFS:
1461 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1462 return 1;
b87c0adf
CL		 1463 default:
1464 goto out_drop;
02a913a7 1465 }
02a913a7 1466 }
24ac23ab 1467 if (state->inode == dentry->d_inode) {
d75340cc 1468 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
4a35bd41 1469 nfs4_intent_set_file(nd, &path, state);
1da177e4
LT		 1470 return 1;
1471 }
a49c3c77 1472 nfs4_close_sync(&path, state, openflags);
02a913a7
TM		 1473out_drop:
1474 d_drop(dentry);
1da177e4
LT		 1475 return 0;
1476}
1477
1478
1479static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1480{
1481 struct nfs4_server_caps_res res = {};
1482 struct rpc_message msg = {
1483 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1484 .rpc_argp = fhandle,
1485 .rpc_resp = &res,
1486 };
1487 int status;
1488
1489 status = rpc_call_sync(server->client, &msg, 0);
1490 if (status == 0) {
1491 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1492 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1493 server->caps |= NFS_CAP_ACLS;
1494 if (res.has_links != 0)
1495 server->caps |= NFS_CAP_HARDLINKS;
1496 if (res.has_symlinks != 0)
1497 server->caps |= NFS_CAP_SYMLINKS;
1498 server->acl_bitmask = res.acl_bitmask;
1499 }
1500 return status;
1501}
1502
55a97593 1503int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1504{
1505 struct nfs4_exception exception = { };
1506 int err;
1507 do {
1508 err = nfs4_handle_exception(server,
1509 _nfs4_server_capabilities(server, fhandle),
1510 &exception);
1511 } while (exception.retry);
1512 return err;
1513}
1514
1515static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1516 struct nfs_fsinfo *info)
1517{
1da177e4
LT		 1518 struct nfs4_lookup_root_arg args = {
1519 .bitmask = nfs4_fattr_bitmap,
1520 };
1521 struct nfs4_lookup_res res = {
1522 .server = server,
0e574af1 1523 .fattr = info->fattr,
1da177e4
LT		 1524 .fh = fhandle,
1525 };
1526 struct rpc_message msg = {
1527 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1528 .rpc_argp = &args,
1529 .rpc_resp = &res,
1530 };
0e574af1 1531 nfs_fattr_init(info->fattr);
1da177e4
LT		 1532 return rpc_call_sync(server->client, &msg, 0);
1533}
1534
1535static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1536 struct nfs_fsinfo *info)
1537{
1538 struct nfs4_exception exception = { };
1539 int err;
1540 do {
1541 err = nfs4_handle_exception(server,
1542 _nfs4_lookup_root(server, fhandle, info),
1543 &exception);
1544 } while (exception.retry);
1545 return err;
1546}
1547
54ceac45
DH		 1548/*
1549 * get the file handle for the "/" directory on the server
1550 */
1da177e4 1551static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1552 struct nfs_fsinfo *info)
1da177e4 1553{
1da177e4
LT		 1554 int status;
1555
1da177e4 1556 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1557 if (status == 0)
1558 status = nfs4_server_capabilities(server, fhandle);
1559 if (status == 0)
1560 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1561 return nfs4_map_errors(status);
1da177e4
LT		 1562}
1563
6b97fd3d
MN		 1564/*
1565 * Get locations and (maybe) other attributes of a referral.
1566 * Note that we'll actually follow the referral later when
1567 * we detect fsid mismatch in inode revalidation
1568 */
56659e99 1569static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
6b97fd3d
MN		 1570{
1571 int status = -ENOMEM;
1572 struct page *page = NULL;
1573 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1574
1575 page = alloc_page(GFP_KERNEL);
1576 if (page == NULL)
1577 goto out;
1578 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1579 if (locations == NULL)
1580 goto out;
1581
c228fd3a 1582 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1583 if (status != 0)
1584 goto out;
1585 /* Make sure server returned a different fsid for the referral */
1586 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1587 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1588 status = -EIO;
1589 goto out;
1590 }
1591
1592 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1593 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1594 if (!fattr->mode)
1595 fattr->mode = S_IFDIR;
1596 memset(fhandle, 0, sizeof(struct nfs_fh));
1597out:
1598 if (page)
1599 __free_page(page);
1600 if (locations)
1601 kfree(locations);
1602 return status;
1603}
1604
1da177e4
LT		 1605static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1606{
1607 struct nfs4_getattr_arg args = {
1608 .fh = fhandle,
1609 .bitmask = server->attr_bitmask,
1610 };
1611 struct nfs4_getattr_res res = {
1612 .fattr = fattr,
1613 .server = server,
1614 };
1615 struct rpc_message msg = {
1616 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1617 .rpc_argp = &args,
1618 .rpc_resp = &res,
1619 };
1620
0e574af1 1621 nfs_fattr_init(fattr);
1da177e4
LT		 1622 return rpc_call_sync(server->client, &msg, 0);
1623}
1624
1625static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1626{
1627 struct nfs4_exception exception = { };
1628 int err;
1629 do {
1630 err = nfs4_handle_exception(server,
1631 _nfs4_proc_getattr(server, fhandle, fattr),
1632 &exception);
1633 } while (exception.retry);
1634 return err;
1635}
1636
1637/*
1638 * The file is not closed if it is opened due to the a request to change
1639 * the size of the file. The open call will not be needed once the
1640 * VFS layer lookup-intents are implemented.
1641 *
1642 * Close is called when the inode is destroyed.
1643 * If we haven't opened the file for O_WRONLY, we
1644 * need to in the size_change case to obtain a stateid.
1645 *
1646 * Got race?
1647 * Because OPEN is always done by name in nfsv4, it is
1648 * possible that we opened a different file by the same
1649 * name. We can recognize this race condition, but we
1650 * can't do anything about it besides returning an error.
1651 *
1652 * This will be fixed with VFS changes (lookup-intent).
1653 */
1654static int
1655nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1656 struct iattr *sattr)
1657{
08e9eac4
TM		 1658 struct rpc_cred *cred;
1659 struct inode *inode = dentry->d_inode;
d530838b
TM		 1660 struct nfs_open_context *ctx;
1661 struct nfs4_state *state = NULL;
1da177e4
LT		 1662 int status;
1663
0e574af1 1664 nfs_fattr_init(fattr);
1da177e4 1665
1f163415 1666 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1667 if (IS_ERR(cred))
1668 return PTR_ERR(cred);
d530838b
TM		 1669
1670 /* Search for an existing open(O_WRITE) file */
1671 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1672 if (ctx != NULL)
1673 state = ctx->state;
08e9eac4 1674
3e4f6290 1675 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1676 if (status == 0)
1677 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1678 if (ctx != NULL)
1679 put_nfs_open_context(ctx);
08e9eac4 1680 put_rpccred(cred);
1da177e4
LT		 1681 return status;
1682}
1683
56659e99
TM		 1684static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1685 const struct qstr *name, struct nfs_fh *fhandle,
2b3de441
DH		 1686 struct nfs_fattr *fattr)
1687{
1688 int status;
1689 struct nfs4_lookup_arg args = {
1690 .bitmask = server->attr_bitmask,
1691 .dir_fh = dirfh,
1692 .name = name,
1693 };
1694 struct nfs4_lookup_res res = {
1695 .server = server,
1696 .fattr = fattr,
1697 .fh = fhandle,
1698 };
1699 struct rpc_message msg = {
1700 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1701 .rpc_argp = &args,
1702 .rpc_resp = &res,
1703 };
1704
1705 nfs_fattr_init(fattr);
1706
1707 dprintk("NFS call lookupfh %s\n", name->name);
1708 status = rpc_call_sync(server->client, &msg, 0);
1709 dprintk("NFS reply lookupfh: %d\n", status);
2b3de441
DH		 1710 return status;
1711}
1712
1713static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1714 struct qstr *name, struct nfs_fh *fhandle,
1715 struct nfs_fattr *fattr)
1716{
1717 struct nfs4_exception exception = { };
1718 int err;
1719 do {
4e56e082
TM		 1720 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1721 /* FIXME: !!!! */
1722 if (err == -NFS4ERR_MOVED) {
1723 err = -EREMOTE;
1724 break;
1725 }
1726 err = nfs4_handle_exception(server, err, &exception);
2b3de441
DH		 1727 } while (exception.retry);
1728 return err;
1729}
1730
56659e99 1731static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1da177e4
LT		 1732 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1733{
4e56e082 1734 int status;
1da177e4
LT		 1735
1736 dprintk("NFS call lookup %s\n", name->name);
4e56e082 1737 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
6b97fd3d
MN		 1738 if (status == -NFS4ERR_MOVED)
1739 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1740 dprintk("NFS reply lookup: %d\n", status);
1741 return status;
1742}
1743
1744static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1745{
1746 struct nfs4_exception exception = { };
1747 int err;
1748 do {
1749 err = nfs4_handle_exception(NFS_SERVER(dir),
1750 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1751 &exception);
1752 } while (exception.retry);
1753 return err;
1754}
1755
1756static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1757{
76b32999
TM		 1758 struct nfs_server *server = NFS_SERVER(inode);
1759 struct nfs_fattr fattr;
1da177e4
LT		 1760 struct nfs4_accessargs args = {
1761 .fh = NFS_FH(inode),
76b32999
TM		 1762 .bitmask = server->attr_bitmask,
1763 };
1764 struct nfs4_accessres res = {
1765 .server = server,
1766 .fattr = &fattr,
1da177e4 1767 };
1da177e4
LT		 1768 struct rpc_message msg = {
1769 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1770 .rpc_argp = &args,
1771 .rpc_resp = &res,
1772 .rpc_cred = entry->cred,
1773 };
1774 int mode = entry->mask;
1775 int status;
1776
1777 /*
1778 * Determine which access bits we want to ask for...
1779 */
1780 if (mode & MAY_READ)
1781 args.access |= NFS4_ACCESS_READ;
1782 if (S_ISDIR(inode->i_mode)) {
1783 if (mode & MAY_WRITE)
1784 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1785 if (mode & MAY_EXEC)
1786 args.access |= NFS4_ACCESS_LOOKUP;
1787 } else {
1788 if (mode & MAY_WRITE)
1789 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1790 if (mode & MAY_EXEC)
1791 args.access |= NFS4_ACCESS_EXECUTE;
1792 }
76b32999 1793 nfs_fattr_init(&fattr);
1da177e4
LT		 1794 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1795 if (!status) {
1796 entry->mask = 0;
1797 if (res.access & NFS4_ACCESS_READ)
1798 entry->mask |= MAY_READ;
1799 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1800 entry->mask |= MAY_WRITE;
1801 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1802 entry->mask |= MAY_EXEC;
76b32999 1803 nfs_refresh_inode(inode, &fattr);
1da177e4
LT		 1804 }
1805 return status;
1806}
1807
1808static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1809{
1810 struct nfs4_exception exception = { };
1811 int err;
1812 do {
1813 err = nfs4_handle_exception(NFS_SERVER(inode),
1814 _nfs4_proc_access(inode, entry),
1815 &exception);
1816 } while (exception.retry);
1817 return err;
1818}
1819
1820/*
1821 * TODO: For the time being, we don't try to get any attributes
1822 * along with any of the zero-copy operations READ, READDIR,
1823 * READLINK, WRITE.
1824 *
1825 * In the case of the first three, we want to put the GETATTR
1826 * after the read-type operation -- this is because it is hard
1827 * to predict the length of a GETATTR response in v4, and thus
1828 * align the READ data correctly. This means that the GETATTR
1829 * may end up partially falling into the page cache, and we should
1830 * shift it into the 'tail' of the xdr_buf before processing.
1831 * To do this efficiently, we need to know the total length
1832 * of data received, which doesn't seem to be available outside
1833 * of the RPC layer.
1834 *
1835 * In the case of WRITE, we also want to put the GETATTR after
1836 * the operation -- in this case because we want to make sure
1837 * we get the post-operation mtime and size. This means that
1838 * we can't use xdr_encode_pages() as written: we need a variant
1839 * of it which would leave room in the 'tail' iovec.
1840 *
1841 * Both of these changes to the XDR layer would in fact be quite
1842 * minor, but I decided to leave them for a subsequent patch.
1843 */
1844static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1845 unsigned int pgbase, unsigned int pglen)
1846{
1847 struct nfs4_readlink args = {
1848 .fh = NFS_FH(inode),
1849 .pgbase = pgbase,
1850 .pglen = pglen,
1851 .pages = &page,
1852 };
1853 struct rpc_message msg = {
1854 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1855 .rpc_argp = &args,
1856 .rpc_resp = NULL,
1857 };
1858
1859 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1860}
1861
1862static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1863 unsigned int pgbase, unsigned int pglen)
1864{
1865 struct nfs4_exception exception = { };
1866 int err;
1867 do {
1868 err = nfs4_handle_exception(NFS_SERVER(inode),
1869 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1870 &exception);
1871 } while (exception.retry);
1872 return err;
1873}
1874
1da177e4
LT		 1875/*
1876 * Got race?
1877 * We will need to arrange for the VFS layer to provide an atomic open.
1878 * Until then, this create/open method is prone to inefficiency and race
1879 * conditions due to the lookup, create, and open VFS calls from sys_open()
1880 * placed on the wire.
1881 *
1882 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1883 * The file will be opened again in the subsequent VFS open call
1884 * (nfs4_proc_file_open).
1885 *
1886 * The open for read will just hang around to be used by any process that
1887 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1888 */
1889
1890static int
1891nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1892 int flags, struct nameidata *nd)
1da177e4 1893{
ad389da7
TM		 1894 struct path path = {
1895 .mnt = nd->mnt,
1896 .dentry = dentry,
1897 };
1da177e4
LT		 1898 struct nfs4_state *state;
1899 struct rpc_cred *cred;
1900 int status = 0;
1901
1f163415 1902 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1903 if (IS_ERR(cred)) {
1904 status = PTR_ERR(cred);
1905 goto out;
1906 }
ad389da7 1907 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1da177e4 1908 put_rpccred(cred);
d4d9cdcb 1909 d_drop(dentry);
1da177e4
LT		 1910 if (IS_ERR(state)) {
1911 status = PTR_ERR(state);
1912 goto out;
1913 }
d4d9cdcb 1914 d_add(dentry, igrab(state->inode));
d75340cc 1915 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1da177e4
LT		 1916 if (flags & O_EXCL) {
1917 struct nfs_fattr fattr;
3e4f6290 1918 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1919 if (status == 0)
65e4308d 1920 nfs_setattr_update_inode(state->inode, sattr);
aa53ed54 1921 nfs_post_op_update_inode(state->inode, &fattr);
02a913a7 1922 }
ad389da7 1923 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
4a35bd41 1924 status = nfs4_intent_set_file(nd, &path, state);
02a913a7 1925 else
a49c3c77 1926 nfs4_close_sync(&path, state, flags);
1da177e4
LT		 1927out:
1928 return status;
1929}
1930
1931static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1932{
16e42959 1933 struct nfs_server *server = NFS_SERVER(dir);
4fdc17b2 1934 struct nfs_removeargs args = {
1da177e4 1935 .fh = NFS_FH(dir),
4fdc17b2
TM		 1936 .name.len = name->len,
1937 .name.name = name->name,
16e42959
TM		 1938 .bitmask = server->attr_bitmask,
1939 };
4fdc17b2 1940 struct nfs_removeres res = {
16e42959 1941 .server = server,
1da177e4 1942 };
1da177e4 1943 struct rpc_message msg = {
4fdc17b2
TM		 1944 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1945 .rpc_argp = &args,
1946 .rpc_resp = &res,
1da177e4
LT		 1947 };
1948 int status;
1949
4fdc17b2 1950 nfs_fattr_init(&res.dir_attr);
16e42959
TM		 1951 status = rpc_call_sync(server->client, &msg, 0);
1952 if (status == 0) {
1953 update_changeattr(dir, &res.cinfo);
4fdc17b2 1954 nfs_post_op_update_inode(dir, &res.dir_attr);
16e42959 1955 }
1da177e4
LT		 1956 return status;
1957}
1958
1959static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1960{
1961 struct nfs4_exception exception = { };
1962 int err;
1963 do {
1964 err = nfs4_handle_exception(NFS_SERVER(dir),
1965 _nfs4_proc_remove(dir, name),
1966 &exception);
1967 } while (exception.retry);
1968 return err;
1969}
1970
e4eff1a6 1971static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1da177e4 1972{
e4eff1a6
TM		 1973 struct nfs_server *server = NFS_SERVER(dir);
1974 struct nfs_removeargs *args = msg->rpc_argp;
1975 struct nfs_removeres *res = msg->rpc_resp;
1da177e4 1976
e4eff1a6
TM		 1977 args->bitmask = server->attr_bitmask;
1978 res->server = server;
1da177e4 1979 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1da177e4
LT		 1980}
1981
e4eff1a6 1982static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1da177e4 1983{
e4eff1a6
TM		 1984 struct nfs_removeres *res = task->tk_msg.rpc_resp;
1985
1986 if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1987 return 0;
1988 update_changeattr(dir, &res->cinfo);
1989 nfs_post_op_update_inode(dir, &res->dir_attr);
1990 return 1;
1da177e4
LT		 1991}
1992
1993static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1994 struct inode *new_dir, struct qstr *new_name)
1995{
6caf2c82 1996 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1997 struct nfs4_rename_arg arg = {
1998 .old_dir = NFS_FH(old_dir),
1999 .new_dir = NFS_FH(new_dir),
2000 .old_name = old_name,
2001 .new_name = new_name,
6caf2c82
TM		 2002 .bitmask = server->attr_bitmask,
2003 };
2004 struct nfs_fattr old_fattr, new_fattr;
2005 struct nfs4_rename_res res = {
2006 .server = server,
2007 .old_fattr = &old_fattr,
2008 .new_fattr = &new_fattr,
1da177e4 2009 };
1da177e4
LT		 2010 struct rpc_message msg = {
2011 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2012 .rpc_argp = &arg,
2013 .rpc_resp = &res,
2014 };
2015 int status;
2016
6caf2c82
TM		 2017 nfs_fattr_init(res.old_fattr);
2018 nfs_fattr_init(res.new_fattr);
2019 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2020
2021 if (!status) {
2022 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2023 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2024 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2025 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2026 }
2027 return status;
2028}
2029
2030static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2031 struct inode *new_dir, struct qstr *new_name)
2032{
2033 struct nfs4_exception exception = { };
2034 int err;
2035 do {
2036 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2037 _nfs4_proc_rename(old_dir, old_name,
2038 new_dir, new_name),
2039 &exception);
2040 } while (exception.retry);
2041 return err;
2042}
2043
2044static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2045{
91ba2eee 2046 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2047 struct nfs4_link_arg arg = {
2048 .fh = NFS_FH(inode),
2049 .dir_fh = NFS_FH(dir),
2050 .name = name,
91ba2eee
TM		 2051 .bitmask = server->attr_bitmask,
2052 };
2053 struct nfs_fattr fattr, dir_attr;
2054 struct nfs4_link_res res = {
2055 .server = server,
2056 .fattr = &fattr,
2057 .dir_attr = &dir_attr,
1da177e4 2058 };
1da177e4
LT		 2059 struct rpc_message msg = {
2060 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2061 .rpc_argp = &arg,
91ba2eee 2062 .rpc_resp = &res,
1da177e4
LT		 2063 };
2064 int status;
2065
91ba2eee
TM		 2066 nfs_fattr_init(res.fattr);
2067 nfs_fattr_init(res.dir_attr);
2068 status = rpc_call_sync(server->client, &msg, 0);
2069 if (!status) {
2070 update_changeattr(dir, &res.cinfo);
2071 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2072 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2073 }
1da177e4
LT		 2074
2075 return status;
2076}
2077
2078static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2079{
2080 struct nfs4_exception exception = { };
2081 int err;
2082 do {
2083 err = nfs4_handle_exception(NFS_SERVER(inode),
2084 _nfs4_proc_link(inode, dir, name),
2085 &exception);
2086 } while (exception.retry);
2087 return err;
2088}
2089
4f390c15 2090static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2091 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2092{
2093 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 2094 struct nfs_fh fhandle;
2095 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2096 struct nfs4_create_arg arg = {
2097 .dir_fh = NFS_FH(dir),
2098 .server = server,
4f390c15 2099 .name = &dentry->d_name,
1da177e4
LT		 2100 .attrs = sattr,
2101 .ftype = NF4LNK,
2102 .bitmask = server->attr_bitmask,
2103 };
2104 struct nfs4_create_res res = {
2105 .server = server,
4f390c15
CL		 2106 .fh = &fhandle,
2107 .fattr = &fattr,
56ae19f3 2108 .dir_fattr = &dir_fattr,
1da177e4
LT		 2109 };
2110 struct rpc_message msg = {
2111 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2112 .rpc_argp = &arg,
2113 .rpc_resp = &res,
2114 };
2115 int status;
2116
94a6d753 2117 if (len > NFS4_MAXPATHLEN)
1da177e4 2118 return -ENAMETOOLONG;
4f390c15 2119
94a6d753
CL		 2120 arg.u.symlink.pages = &page;
2121 arg.u.symlink.len = len;
4f390c15 2122 nfs_fattr_init(&fattr);
56ae19f3 2123 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2124
2125 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2126 if (!status) {
1da177e4 2127 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2128 nfs_post_op_update_inode(dir, res.dir_fattr);
2129 status = nfs_instantiate(dentry, &fhandle, &fattr);
2130 }
1da177e4
LT		 2131 return status;
2132}
2133
4f390c15 2134static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2135 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2136{
2137 struct nfs4_exception exception = { };
2138 int err;
2139 do {
2140 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2141 _nfs4_proc_symlink(dir, dentry, page,
2142 len, sattr),
1da177e4
LT		 2143 &exception);
2144 } while (exception.retry);
2145 return err;
2146}
2147
2148static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2149 struct iattr *sattr)
2150{
2151 struct nfs_server *server = NFS_SERVER(dir);
2152 struct nfs_fh fhandle;
56ae19f3 2153 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2154 struct nfs4_create_arg arg = {
2155 .dir_fh = NFS_FH(dir),
2156 .server = server,
2157 .name = &dentry->d_name,
2158 .attrs = sattr,
2159 .ftype = NF4DIR,
2160 .bitmask = server->attr_bitmask,
2161 };
2162 struct nfs4_create_res res = {
2163 .server = server,
2164 .fh = &fhandle,
2165 .fattr = &fattr,
56ae19f3 2166 .dir_fattr = &dir_fattr,
1da177e4
LT		 2167 };
2168 struct rpc_message msg = {
2169 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2170 .rpc_argp = &arg,
2171 .rpc_resp = &res,
2172 };
2173 int status;
2174
0e574af1 2175 nfs_fattr_init(&fattr);
56ae19f3 2176 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2177
2178 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2179 if (!status) {
2180 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2181 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2182 status = nfs_instantiate(dentry, &fhandle, &fattr);
2183 }
2184 return status;
2185}
2186
2187static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2188 struct iattr *sattr)
2189{
2190 struct nfs4_exception exception = { };
2191 int err;
2192 do {
2193 err = nfs4_handle_exception(NFS_SERVER(dir),
2194 _nfs4_proc_mkdir(dir, dentry, sattr),
2195 &exception);
2196 } while (exception.retry);
2197 return err;
2198}
2199
2200static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2201 u64 cookie, struct page *page, unsigned int count, int plus)
2202{
2203 struct inode *dir = dentry->d_inode;
2204 struct nfs4_readdir_arg args = {
2205 .fh = NFS_FH(dir),
2206 .pages = &page,
2207 .pgbase = 0,
2208 .count = count,
2209 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2210 };
2211 struct nfs4_readdir_res res;
2212 struct rpc_message msg = {
2213 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2214 .rpc_argp = &args,
2215 .rpc_resp = &res,
2216 .rpc_cred = cred,
2217 };
2218 int status;
2219
eadf4598
TM		 2220 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2221 dentry->d_parent->d_name.name,
2222 dentry->d_name.name,
2223 (unsigned long long)cookie);
1da177e4
LT		 2224 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2225 res.pgbase = args.pgbase;
2226 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2227 if (status == 0)
2228 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
c4812998
TM		 2229
2230 nfs_invalidate_atime(dir);
2231
eadf4598 2232 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2233 return status;
2234}
2235
2236static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2237 u64 cookie, struct page *page, unsigned int count, int plus)
2238{
2239 struct nfs4_exception exception = { };
2240 int err;
2241 do {
2242 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2243 _nfs4_proc_readdir(dentry, cred, cookie,
2244 page, count, plus),
2245 &exception);
2246 } while (exception.retry);
2247 return err;
2248}
2249
2250static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2251 struct iattr *sattr, dev_t rdev)
2252{
2253 struct nfs_server *server = NFS_SERVER(dir);
2254 struct nfs_fh fh;
56ae19f3 2255 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2256 struct nfs4_create_arg arg = {
2257 .dir_fh = NFS_FH(dir),
2258 .server = server,
2259 .name = &dentry->d_name,
2260 .attrs = sattr,
2261 .bitmask = server->attr_bitmask,
2262 };
2263 struct nfs4_create_res res = {
2264 .server = server,
2265 .fh = &fh,
2266 .fattr = &fattr,
56ae19f3 2267 .dir_fattr = &dir_fattr,
1da177e4
LT		 2268 };
2269 struct rpc_message msg = {
2270 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2271 .rpc_argp = &arg,
2272 .rpc_resp = &res,
2273 };
2274 int status;
2275 int mode = sattr->ia_mode;
2276
0e574af1 2277 nfs_fattr_init(&fattr);
56ae19f3 2278 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2279
2280 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2281 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2282 if (S_ISFIFO(mode))
2283 arg.ftype = NF4FIFO;
2284 else if (S_ISBLK(mode)) {
2285 arg.ftype = NF4BLK;
2286 arg.u.device.specdata1 = MAJOR(rdev);
2287 arg.u.device.specdata2 = MINOR(rdev);
2288 }
2289 else if (S_ISCHR(mode)) {
2290 arg.ftype = NF4CHR;
2291 arg.u.device.specdata1 = MAJOR(rdev);
2292 arg.u.device.specdata2 = MINOR(rdev);
2293 }
2294 else
2295 arg.ftype = NF4SOCK;
2296
2297 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2298 if (status == 0) {
2299 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2300 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2301 status = nfs_instantiate(dentry, &fh, &fattr);
2302 }
2303 return status;
2304}
2305
2306static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2307 struct iattr *sattr, dev_t rdev)
2308{
2309 struct nfs4_exception exception = { };
2310 int err;
2311 do {
2312 err = nfs4_handle_exception(NFS_SERVER(dir),
2313 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2314 &exception);
2315 } while (exception.retry);
2316 return err;
2317}
2318
2319static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2320 struct nfs_fsstat *fsstat)
2321{
2322 struct nfs4_statfs_arg args = {
2323 .fh = fhandle,
2324 .bitmask = server->attr_bitmask,
2325 };
2326 struct rpc_message msg = {
2327 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2328 .rpc_argp = &args,
2329 .rpc_resp = fsstat,
2330 };
2331
0e574af1 2332 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2333 return rpc_call_sync(server->client, &msg, 0);
2334}
2335
2336static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2337{
2338 struct nfs4_exception exception = { };
2339 int err;
2340 do {
2341 err = nfs4_handle_exception(server,
2342 _nfs4_proc_statfs(server, fhandle, fsstat),
2343 &exception);
2344 } while (exception.retry);
2345 return err;
2346}
2347
2348static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2349 struct nfs_fsinfo *fsinfo)
2350{
2351 struct nfs4_fsinfo_arg args = {
2352 .fh = fhandle,
2353 .bitmask = server->attr_bitmask,
2354 };
2355 struct rpc_message msg = {
2356 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2357 .rpc_argp = &args,
2358 .rpc_resp = fsinfo,
2359 };
2360
2361 return rpc_call_sync(server->client, &msg, 0);
2362}
2363
2364static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2365{
2366 struct nfs4_exception exception = { };
2367 int err;
2368
2369 do {
2370 err = nfs4_handle_exception(server,
2371 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2372 &exception);
2373 } while (exception.retry);
2374 return err;
2375}
2376
2377static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2378{
0e574af1 2379 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2380 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2381}
2382
2383static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2384 struct nfs_pathconf *pathconf)
2385{
2386 struct nfs4_pathconf_arg args = {
2387 .fh = fhandle,
2388 .bitmask = server->attr_bitmask,
2389 };
2390 struct rpc_message msg = {
2391 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2392 .rpc_argp = &args,
2393 .rpc_resp = pathconf,
2394 };
2395
2396 /* None of the pathconf attributes are mandatory to implement */
2397 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2398 memset(pathconf, 0, sizeof(*pathconf));
2399 return 0;
2400 }
2401
0e574af1 2402 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2403 return rpc_call_sync(server->client, &msg, 0);
2404}
2405
2406static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2407 struct nfs_pathconf *pathconf)
2408{
2409 struct nfs4_exception exception = { };
2410 int err;
2411
2412 do {
2413 err = nfs4_handle_exception(server,
2414 _nfs4_proc_pathconf(server, fhandle, pathconf),
2415 &exception);
2416 } while (exception.retry);
2417 return err;
2418}
2419
ec06c096 2420static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2421{
ec06c096 2422 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2423
ec06c096 2424 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2425 rpc_restart_call(task);
ec06c096 2426 return -EAGAIN;
1da177e4 2427 }
8850df99
TM		 2428
2429 nfs_invalidate_atime(data->inode);
1da177e4 2430 if (task->tk_status > 0)
ec06c096
TM		 2431 renew_lease(server, data->timestamp);
2432 return 0;
1da177e4
LT		 2433}
2434
ec06c096 2435static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2436{
1da177e4
LT		 2437 struct rpc_message msg = {
2438 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2439 .rpc_argp = &data->args,
2440 .rpc_resp = &data->res,
2441 .rpc_cred = data->cred,
2442 };
1da177e4
LT		 2443
2444 data->timestamp = jiffies;
2445
ec06c096 2446 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2447}
2448
788e7a89 2449static int nfs4_write_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 2457 if (task->tk_status >= 0) {
1da177e4 2458 renew_lease(NFS_SERVER(inode), data->timestamp);
70ca8852 2459 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
4f9838c7 2460 }
788e7a89 2461 return 0;
1da177e4
LT		 2462}
2463
788e7a89 2464static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2465{
1da177e4
LT		 2466 struct rpc_message msg = {
2467 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2468 .rpc_argp = &data->args,
2469 .rpc_resp = &data->res,
2470 .rpc_cred = data->cred,
2471 };
2472 struct inode *inode = data->inode;
4f9838c7 2473 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2474 int stable;
1da177e4
LT		 2475
2476 if (how & FLUSH_STABLE) {
2477 if (!NFS_I(inode)->ncommit)
2478 stable = NFS_FILE_SYNC;
2479 else
2480 stable = NFS_DATA_SYNC;
2481 } else
2482 stable = NFS_UNSTABLE;
2483 data->args.stable = stable;
4f9838c7
TM		 2484 data->args.bitmask = server->attr_bitmask;
2485 data->res.server = server;
1da177e4
LT		 2486
2487 data->timestamp = jiffies;
2488
1da177e4 2489 /* Finalize the task. */
788e7a89 2490 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2491}
2492
788e7a89 2493static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2494{
1da177e4
LT		 2495 struct inode *inode = data->inode;
2496
2497 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2498 rpc_restart_call(task);
788e7a89 2499 return -EAGAIN;
1da177e4 2500 }
9e08a3c5 2501 nfs_refresh_inode(inode, data->res.fattr);
788e7a89 2502 return 0;
1da177e4
LT		 2503}
2504
788e7a89 2505static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2506{
1da177e4
LT		 2507 struct rpc_message msg = {
2508 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2509 .rpc_argp = &data->args,
2510 .rpc_resp = &data->res,
2511 .rpc_cred = data->cred,
2512 };
788e7a89 2513 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2514
4f9838c7
TM		 2515 data->args.bitmask = server->attr_bitmask;
2516 data->res.server = server;
2517
788e7a89 2518 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2519}
2520
2521/*
2522 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2523 * standalone procedure for queueing an asynchronous RENEW.
2524 */
963d8fe5 2525static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2526{
adfa6f98 2527 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2528 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2529
2530 if (task->tk_status < 0) {
2531 switch (task->tk_status) {
2532 case -NFS4ERR_STALE_CLIENTID:
2533 case -NFS4ERR_EXPIRED:
2534 case -NFS4ERR_CB_PATH_DOWN:
2535 nfs4_schedule_state_recovery(clp);
2536 }
2537 return;
2538 }
2539 spin_lock(&clp->cl_lock);
2540 if (time_before(clp->cl_last_renewal,timestamp))
2541 clp->cl_last_renewal = timestamp;
2542 spin_unlock(&clp->cl_lock);
2543}
2544
963d8fe5
TM		 2545static const struct rpc_call_ops nfs4_renew_ops = {
2546 .rpc_call_done = nfs4_renew_done,
2547};
2548
adfa6f98 2549int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2550{
2551 struct rpc_message msg = {
2552 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2553 .rpc_argp = clp,
b4454fe1 2554 .rpc_cred = cred,
1da177e4
LT		 2555 };
2556
2557 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2558 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2559}
2560
adfa6f98 2561int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2562{
2563 struct rpc_message msg = {
2564 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2565 .rpc_argp = clp,
b4454fe1 2566 .rpc_cred = cred,
1da177e4
LT		 2567 };
2568 unsigned long now = jiffies;
2569 int status;
2570
2571 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2572 if (status < 0)
2573 return status;
2574 spin_lock(&clp->cl_lock);
2575 if (time_before(clp->cl_last_renewal,now))
2576 clp->cl_last_renewal = now;
2577 spin_unlock(&clp->cl_lock);
2578 return 0;
2579}
2580
aa1870af
BF		 2581static inline int nfs4_server_supports_acls(struct nfs_server *server)
2582{
2583 return (server->caps & NFS_CAP_ACLS)
2584 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2585 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2586}
2587
2588/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2589 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2590 * the stack.
2591 */
2592#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2593
2594static void buf_to_pages(const void *buf, size_t buflen,
2595 struct page **pages, unsigned int *pgbase)
2596{
2597 const void *p = buf;
2598
2599 *pgbase = offset_in_page(buf);
2600 p -= *pgbase;
2601 while (p < buf + buflen) {
2602 *(pages++) = virt_to_page(p);
2603 p += PAGE_CACHE_SIZE;
2604 }
2605}
2606
e50a1c2e
BF		 2607struct nfs4_cached_acl {
2608 int cached;
2609 size_t len;
3e9d4154 2610 char data[0];
e50a1c2e
BF		 2611};
2612
2613static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2614{
2615 struct nfs_inode *nfsi = NFS_I(inode);
2616
2617 spin_lock(&inode->i_lock);
2618 kfree(nfsi->nfs4_acl);
2619 nfsi->nfs4_acl = acl;
2620 spin_unlock(&inode->i_lock);
2621}
2622
2623static void nfs4_zap_acl_attr(struct inode *inode)
2624{
2625 nfs4_set_cached_acl(inode, NULL);
2626}
2627
2628static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2629{
2630 struct nfs_inode *nfsi = NFS_I(inode);
2631 struct nfs4_cached_acl *acl;
2632 int ret = -ENOENT;
2633
2634 spin_lock(&inode->i_lock);
2635 acl = nfsi->nfs4_acl;
2636 if (acl == NULL)
2637 goto out;
2638 if (buf == NULL) /* user is just asking for length */
2639 goto out_len;
2640 if (acl->cached == 0)
2641 goto out;
2642 ret = -ERANGE; /* see getxattr(2) man page */
2643 if (acl->len > buflen)
2644 goto out;
2645 memcpy(buf, acl->data, acl->len);
2646out_len:
2647 ret = acl->len;
2648out:
2649 spin_unlock(&inode->i_lock);
2650 return ret;
2651}
2652
2653static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2654{
2655 struct nfs4_cached_acl *acl;
2656
2657 if (buf && acl_len <= PAGE_SIZE) {
2658 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2659 if (acl == NULL)
2660 goto out;
2661 acl->cached = 1;
2662 memcpy(acl->data, buf, acl_len);
2663 } else {
2664 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2665 if (acl == NULL)
2666 goto out;
2667 acl->cached = 0;
2668 }
2669 acl->len = acl_len;
2670out:
2671 nfs4_set_cached_acl(inode, acl);
2672}
2673
16b4289c 2674static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2675{
aa1870af
BF		 2676 struct page *pages[NFS4ACL_MAXPAGES];
2677 struct nfs_getaclargs args = {
2678 .fh = NFS_FH(inode),
2679 .acl_pages = pages,
2680 .acl_len = buflen,
2681 };
2682 size_t resp_len = buflen;
e50a1c2e 2683 void *resp_buf;
aa1870af
BF		 2684 struct rpc_message msg = {
2685 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2686 .rpc_argp = &args,
2687 .rpc_resp = &resp_len,
2688 };
e50a1c2e 2689 struct page *localpage = NULL;
aa1870af
BF		 2690 int ret;
2691
e50a1c2e
BF		 2692 if (buflen < PAGE_SIZE) {
2693 /* As long as we're doing a round trip to the server anyway,
2694 * let's be prepared for a page of acl data. */
2695 localpage = alloc_page(GFP_KERNEL);
2696 resp_buf = page_address(localpage);
2697 if (localpage == NULL)
2698 return -ENOMEM;
2699 args.acl_pages[0] = localpage;
2700 args.acl_pgbase = 0;
1d95db8e 2701 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2702 } else {
2703 resp_buf = buf;
2704 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2705 }
aa1870af 2706 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2707 if (ret)
2708 goto out_free;
2709 if (resp_len > args.acl_len)
2710 nfs4_write_cached_acl(inode, NULL, resp_len);
2711 else
2712 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2713 if (buf) {
2714 ret = -ERANGE;
2715 if (resp_len > buflen)
2716 goto out_free;
2717 if (localpage)
2718 memcpy(buf, resp_buf, resp_len);
2719 }
2720 ret = resp_len;
2721out_free:
2722 if (localpage)
2723 __free_page(localpage);
aa1870af
BF		 2724 return ret;
2725}
2726
16b4289c
TM		 2727static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2728{
2729 struct nfs4_exception exception = { };
2730 ssize_t ret;
2731 do {
2732 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2733 if (ret >= 0)
2734 break;
2735 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2736 } while (exception.retry);
2737 return ret;
2738}
2739
e50a1c2e
BF		 2740static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2741{
2742 struct nfs_server *server = NFS_SERVER(inode);
2743 int ret;
2744
2745 if (!nfs4_server_supports_acls(server))
2746 return -EOPNOTSUPP;
2747 ret = nfs_revalidate_inode(server, inode);
2748 if (ret < 0)
2749 return ret;
2750 ret = nfs4_read_cached_acl(inode, buf, buflen);
2751 if (ret != -ENOENT)
2752 return ret;
2753 return nfs4_get_acl_uncached(inode, buf, buflen);
2754}
2755
16b4289c 2756static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2757{
2758 struct nfs_server *server = NFS_SERVER(inode);
2759 struct page *pages[NFS4ACL_MAXPAGES];
2760 struct nfs_setaclargs arg = {
2761 .fh = NFS_FH(inode),
2762 .acl_pages = pages,
2763 .acl_len = buflen,
2764 };
2765 struct rpc_message msg = {
2766 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2767 .rpc_argp = &arg,
2768 .rpc_resp = NULL,
2769 };
2770 int ret;
2771
2772 if (!nfs4_server_supports_acls(server))
2773 return -EOPNOTSUPP;
642ac549 2774 nfs_inode_return_delegation(inode);
4b580ee3 2775 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2776 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
08efa202 2777 nfs_zap_caches(inode);
4b580ee3
BF		 2778 return ret;
2779}
2780
16b4289c
TM		 2781static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2782{
2783 struct nfs4_exception exception = { };
2784 int err;
2785 do {
2786 err = nfs4_handle_exception(NFS_SERVER(inode),
2787 __nfs4_proc_set_acl(inode, buf, buflen),
2788 &exception);
2789 } while (exception.retry);
2790 return err;
2791}
2792
1da177e4 2793static int
faf5f49c 2794nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2795{
7539bbab 2796 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2797
2798 if (!clp || task->tk_status >= 0)
2799 return 0;
2800 switch(task->tk_status) {
2801 case -NFS4ERR_STALE_CLIENTID:
2802 case -NFS4ERR_STALE_STATEID:
2803 case -NFS4ERR_EXPIRED:
2804 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2805 nfs4_schedule_state_recovery(clp);
433fbe4c 2806 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2807 rpc_wake_up_task(task);
2808 task->tk_status = 0;
2809 return -EAGAIN;
1da177e4 2810 case -NFS4ERR_DELAY:
006ea73e
CL		 2811 nfs_inc_server_stats((struct nfs_server *) server,
2812 NFSIOS_DELAY);
2813 case -NFS4ERR_GRACE:
1da177e4
LT		 2814 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2815 task->tk_status = 0;
2816 return -EAGAIN;
2817 case -NFS4ERR_OLD_STATEID:
2818 task->tk_status = 0;
2819 return -EAGAIN;
2820 }
2821 task->tk_status = nfs4_map_errors(task->tk_status);
2822 return 0;
2823}
2824
433fbe4c
TM		 2825static int nfs4_wait_bit_interruptible(void *word)
2826{
2827 if (signal_pending(current))
2828 return -ERESTARTSYS;
2829 schedule();
2830 return 0;
2831}
2832
adfa6f98 2833static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2834{
1da177e4 2835 sigset_t oldset;
433fbe4c 2836 int res;
1da177e4
LT		 2837
2838 might_sleep();
2839
e148582e
TM		 2840 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2841
1da177e4 2842 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2843 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2844 nfs4_wait_bit_interruptible,
2845 TASK_INTERRUPTIBLE);
1da177e4 2846 rpc_clnt_sigunmask(clnt, &oldset);
e148582e
TM		 2847
2848 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2849 return res;
2850}
2851
2852static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2853{
2854 sigset_t oldset;
2855 int res = 0;
2856
2857 might_sleep();
2858
2859 if (*timeout <= 0)
2860 *timeout = NFS4_POLL_RETRY_MIN;
2861 if (*timeout > NFS4_POLL_RETRY_MAX)
2862 *timeout = NFS4_POLL_RETRY_MAX;
2863 rpc_clnt_sigmask(clnt, &oldset);
2864 if (clnt->cl_intr) {
041e0e3b 2865 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2866 if (signalled())
2867 res = -ERESTARTSYS;
041e0e3b
NA		 2868 } else
2869 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2870 rpc_clnt_sigunmask(clnt, &oldset);
2871 *timeout <<= 1;
2872 return res;
2873}
2874
2875/* This is the error handling routine for processes that are allowed
2876 * to sleep.
2877 */
10afec90 2878static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2879{
7539bbab 2880 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2881 int ret = errorcode;
2882
2883 exception->retry = 0;
2884 switch(errorcode) {
2885 case 0:
2886 return 0;
2887 case -NFS4ERR_STALE_CLIENTID:
2888 case -NFS4ERR_STALE_STATEID:
2889 case -NFS4ERR_EXPIRED:
433fbe4c 2890 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2891 ret = nfs4_wait_clnt_recover(server->client, clp);
2892 if (ret == 0)
2893 exception->retry = 1;
2894 break;
c514983d 2895 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2896 case -NFS4ERR_GRACE:
2897 case -NFS4ERR_DELAY:
2898 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2899 if (ret != 0)
2900 break;
1da177e4 2901 case -NFS4ERR_OLD_STATEID:
2c56617d 2902 exception->retry = 1;
1da177e4
LT		 2903 }
2904 /* We failed to handle the error */
2905 return nfs4_map_errors(ret);
2906}
2907
adfa6f98 2908int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2909{
2910 nfs4_verifier sc_verifier;
2911 struct nfs4_setclientid setclientid = {
2912 .sc_verifier = &sc_verifier,
2913 .sc_prog = program,
2914 };
2915 struct rpc_message msg = {
2916 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2917 .rpc_argp = &setclientid,
2918 .rpc_resp = clp,
286d7d6a 2919 .rpc_cred = cred,
1da177e4 2920 };
bc4785cd 2921 __be32 *p;
1da177e4
LT		 2922 int loop = 0;
2923 int status;
2924
bc4785cd 2925 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2926 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2927 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2928
2929 for(;;) {
2930 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2931 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2932 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2933 cred->cr_ops->cr_name,
1da177e4
LT		 2934 clp->cl_id_uniquifier);
2935 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2936 sizeof(setclientid.sc_netid), "tcp");
2937 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2938 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2939 clp->cl_ipaddr, port >> 8, port & 255);
2940
2941 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2942 if (status != -NFS4ERR_CLID_INUSE)
2943 break;
2944 if (signalled())
2945 break;
2946 if (loop++ & 1)
2947 ssleep(clp->cl_lease_time + 1);
2948 else
2949 if (++clp->cl_id_uniquifier == 0)
2950 break;
2951 }
2952 return status;
2953}
2954
adfa6f98 2955static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2956{
2957 struct nfs_fsinfo fsinfo;
2958 struct rpc_message msg = {
2959 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2960 .rpc_argp = clp,
2961 .rpc_resp = &fsinfo,
286d7d6a 2962 .rpc_cred = cred,
1da177e4
LT		 2963 };
2964 unsigned long now;
2965 int status;
2966
2967 now = jiffies;
2968 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2969 if (status == 0) {
2970 spin_lock(&clp->cl_lock);
2971 clp->cl_lease_time = fsinfo.lease_time * HZ;
2972 clp->cl_last_renewal = now;
58d9714a 2973 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2974 spin_unlock(&clp->cl_lock);
2975 }
2976 return status;
2977}
2978
adfa6f98 2979int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2980{
2981 long timeout;
2982 int err;
2983 do {
2984 err = _nfs4_proc_setclientid_confirm(clp, cred);
2985 switch (err) {
2986 case 0:
2987 return err;
2988 case -NFS4ERR_RESOURCE:
2989 /* The IBM lawyers misread another document! */
2990 case -NFS4ERR_DELAY:
2991 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2992 }
2993 } while (err == 0);
2994 return err;
2995}
2996
fe650407
TM		 2997struct nfs4_delegreturndata {
2998 struct nfs4_delegreturnargs args;
fa178f29 2999 struct nfs4_delegreturnres res;
fe650407
TM		 3000 struct nfs_fh fh;
3001 nfs4_stateid stateid;
3002 struct rpc_cred *cred;
26e976a8 3003 unsigned long timestamp;
fa178f29 3004 struct nfs_fattr fattr;
fe650407
TM		 3005 int rpc_status;
3006};
3007
3008static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 3009{
fe650407 3010 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 3011 struct rpc_message msg = {
3012 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 3013 .rpc_argp = &data->args,
fa178f29 3014 .rpc_resp = &data->res,
fe650407 3015 .rpc_cred = data->cred,
1da177e4 3016 };
fa178f29 3017 nfs_fattr_init(data->res.fattr);
fe650407
TM		 3018 rpc_call_setup(task, &msg, 0);
3019}
1da177e4 3020
fe650407
TM		 3021static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3022{
3023 struct nfs4_delegreturndata *data = calldata;
3024 data->rpc_status = task->tk_status;
26e976a8 3025 if (data->rpc_status == 0)
fa178f29 3026 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 3027}
3028
3029static void nfs4_delegreturn_release(void *calldata)
3030{
3031 struct nfs4_delegreturndata *data = calldata;
3032
3033 put_rpccred(data->cred);
3034 kfree(calldata);
3035}
3036
c8d149f3 3037static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 3038 .rpc_call_prepare = nfs4_delegreturn_prepare,
3039 .rpc_call_done = nfs4_delegreturn_done,
3040 .rpc_release = nfs4_delegreturn_release,
3041};
3042
3043static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3044{
3045 struct nfs4_delegreturndata *data;
fa178f29 3046 struct nfs_server *server = NFS_SERVER(inode);
fe650407 3047 struct rpc_task *task;
c970aa85
TM		 3048 struct rpc_task_setup task_setup_data = {
3049 .rpc_client = server->client,
3050 .callback_ops = &nfs4_delegreturn_ops,
3051 .flags = RPC_TASK_ASYNC,
3052 };
fe650407
TM		 3053 int status;
3054
3055 data = kmalloc(sizeof(*data), GFP_KERNEL);
3056 if (data == NULL)
3057 return -ENOMEM;
3058 data->args.fhandle = &data->fh;
3059 data->args.stateid = &data->stateid;
fa178f29 3060 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3061 nfs_copy_fh(&data->fh, NFS_FH(inode));
3062 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3063 data->res.fattr = &data->fattr;
3064 data->res.server = server;
fe650407 3065 data->cred = get_rpccred(cred);
26e976a8 3066 data->timestamp = jiffies;
fe650407
TM		 3067 data->rpc_status = 0;
3068
c970aa85
TM		 3069 task_setup_data.callback_data = data;
3070 task = rpc_run_task(&task_setup_data);
7a1218a2 3071 if (IS_ERR(task))
fe650407 3072 return PTR_ERR(task);
fe650407 3073 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 3074 if (status == 0) {
fe650407 3075 status = data->rpc_status;
fa178f29 3076 if (status == 0)
9e08a3c5 3077 nfs_refresh_inode(inode, &data->fattr);
fa178f29 3078 }
e6b3c4db 3079 rpc_put_task(task);
fe650407 3080 return status;
1da177e4
LT		 3081}
3082
3083int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3084{
3085 struct nfs_server *server = NFS_SERVER(inode);
3086 struct nfs4_exception exception = { };
3087 int err;
3088 do {
3089 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3090 switch (err) {
3091 case -NFS4ERR_STALE_STATEID:
3092 case -NFS4ERR_EXPIRED:
1da177e4
LT		 3093 case 0:
3094 return 0;
3095 }
3096 err = nfs4_handle_exception(server, err, &exception);
3097 } while (exception.retry);
3098 return err;
3099}
3100
3101#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3102#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3103
3104/*
3105 * sleep, with exponential backoff, and retry the LOCK operation.
3106 */
3107static unsigned long
3108nfs4_set_lock_task_retry(unsigned long timeout)
3109{
041e0e3b 3110 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3111 timeout <<= 1;
3112 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3113 return NFS4_LOCK_MAXTIMEOUT;
3114 return timeout;
3115}
3116
1da177e4
LT		 3117static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3118{
3119 struct inode *inode = state->inode;
3120 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3121 struct nfs_client *clp = server->nfs_client;
911d1aaf 3122 struct nfs_lockt_args arg = {
1da177e4 3123 .fh = NFS_FH(inode),
911d1aaf 3124 .fl = request,
1da177e4 3125 };
911d1aaf
TM		 3126 struct nfs_lockt_res res = {
3127 .denied = request,
1da177e4
LT		 3128 };
3129 struct rpc_message msg = {
3130 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3131 .rpc_argp = &arg,
3132 .rpc_resp = &res,
3133 .rpc_cred = state->owner->so_cred,
3134 };
1da177e4
LT		 3135 struct nfs4_lock_state *lsp;
3136 int status;
3137
3138 down_read(&clp->cl_sem);
911d1aaf 3139 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3140 status = nfs4_set_lock_state(state, request);
3141 if (status != 0)
3142 goto out;
3143 lsp = request->fl_u.nfs4_fl.owner;
9f958ab8 3144 arg.lock_owner.id = lsp->ls_id.id;
1da177e4 3145 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3146 switch (status) {
3147 case 0:
3148 request->fl_type = F_UNLCK;
3149 break;
3150 case -NFS4ERR_DENIED:
3151 status = 0;
1da177e4 3152 }
70cc6487 3153 request->fl_ops->fl_release_private(request);
8d0a8a9d 3154out:
1da177e4
LT		 3155 up_read(&clp->cl_sem);
3156 return status;
3157}
3158
3159static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3160{
3161 struct nfs4_exception exception = { };
3162 int err;
3163
3164 do {
3165 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3166 _nfs4_proc_getlk(state, cmd, request),
3167 &exception);
3168 } while (exception.retry);
3169 return err;
3170}
3171
3172static int do_vfs_lock(struct file *file, struct file_lock *fl)
3173{
3174 int res = 0;
3175 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3176 case FL_POSIX:
3177 res = posix_lock_file_wait(file, fl);
3178 break;
3179 case FL_FLOCK:
3180 res = flock_lock_file_wait(file, fl);
3181 break;
3182 default:
3183 BUG();
3184 }
1da177e4
LT		 3185 return res;
3186}
3187
faf5f49c 3188struct nfs4_unlockdata {
911d1aaf
TM		 3189 struct nfs_locku_args arg;
3190 struct nfs_locku_res res;
faf5f49c
TM		 3191 struct nfs4_lock_state *lsp;
3192 struct nfs_open_context *ctx;
911d1aaf
TM		 3193 struct file_lock fl;
3194 const struct nfs_server *server;
26e976a8 3195 unsigned long timestamp;
faf5f49c
TM		 3196};
3197
911d1aaf
TM		 3198static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3199 struct nfs_open_context *ctx,
3200 struct nfs4_lock_state *lsp,
3201 struct nfs_seqid *seqid)
3202{
3203 struct nfs4_unlockdata *p;
3204 struct inode *inode = lsp->ls_state->inode;
3205
3206 p = kmalloc(sizeof(*p), GFP_KERNEL);
3207 if (p == NULL)
3208 return NULL;
3209 p->arg.fh = NFS_FH(inode);
3210 p->arg.fl = &p->fl;
3211 p->arg.seqid = seqid;
3212 p->arg.stateid = &lsp->ls_stateid;
3213 p->lsp = lsp;
3214 atomic_inc(&lsp->ls_count);
3215 /* Ensure we don't close file until we're done freeing locks! */
3216 p->ctx = get_nfs_open_context(ctx);
3217 memcpy(&p->fl, fl, sizeof(p->fl));
3218 p->server = NFS_SERVER(inode);
3219 return p;
3220}
3221
06f814a3 3222static void nfs4_locku_release_calldata(void *data)
faf5f49c 3223{
963d8fe5 3224 struct nfs4_unlockdata *calldata = data;
911d1aaf 3225 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3226 nfs4_put_lock_state(calldata->lsp);
3227 put_nfs_open_context(calldata->ctx);
3228 kfree(calldata);
faf5f49c
TM		 3229}
3230
963d8fe5 3231static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3232{
963d8fe5 3233 struct nfs4_unlockdata *calldata = data;
faf5f49c 3234
06f814a3
TM		 3235 if (RPC_ASSASSINATED(task))
3236 return;
911d1aaf 3237 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3238 switch (task->tk_status) {
3239 case 0:
3240 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3241 calldata->res.stateid.data,
faf5f49c 3242 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3243 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3244 break;
3245 case -NFS4ERR_STALE_STATEID:
3246 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3247 break;
3248 default:
a6a352e9 3249 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3250 rpc_restart_call(task);
faf5f49c 3251 }
faf5f49c
TM		 3252}
3253
4ce70ada 3254static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3255{
4ce70ada 3256 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3257 struct rpc_message msg = {
3258 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3259 .rpc_argp = &calldata->arg,
3260 .rpc_resp = &calldata->res,
3261 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3262 };
faf5f49c 3263
911d1aaf 3264 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3265 return;
3266 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3267 /* Note: exit _without_ running nfs4_locku_done */
3268 task->tk_action = NULL;
faf5f49c
TM		 3269 return;
3270 }
26e976a8 3271 calldata->timestamp = jiffies;
faf5f49c
TM		 3272 rpc_call_setup(task, &msg, 0);
3273}
3274
963d8fe5 3275static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3276 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3277 .rpc_call_done = nfs4_locku_done,
06f814a3 3278 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3279};
3280
a5d16a4d
TM		 3281static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3282 struct nfs_open_context *ctx,
3283 struct nfs4_lock_state *lsp,
3284 struct nfs_seqid *seqid)
3285{
3286 struct nfs4_unlockdata *data;
c970aa85
TM		 3287 struct rpc_task_setup task_setup_data = {
3288 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3289 .callback_ops = &nfs4_locku_ops,
3290 .flags = RPC_TASK_ASYNC,
3291 };
a5d16a4d 3292
137d6aca
FF		 3293 /* Ensure this is an unlock - when canceling a lock, the
3294 * canceled lock is passed in, and it won't be an unlock.
3295 */
3296 fl->fl_type = F_UNLCK;
3297
a5d16a4d
TM		 3298 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3299 if (data == NULL) {
3300 nfs_free_seqid(seqid);
3301 return ERR_PTR(-ENOMEM);
3302 }
3303
c970aa85
TM		 3304 task_setup_data.callback_data = data;
3305 return rpc_run_task(&task_setup_data);
a5d16a4d
TM		 3306}
3307
faf5f49c
TM		 3308static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3309{
911d1aaf 3310 struct nfs_seqid *seqid;
1da177e4 3311 struct nfs4_lock_state *lsp;
06f814a3
TM		 3312 struct rpc_task *task;
3313 int status = 0;
faf5f49c 3314
8d0a8a9d 3315 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3316 /* Unlock _before_ we do the RPC call */
3317 request->fl_flags |= FL_EXISTS;
3318 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3319 goto out;
8d0a8a9d 3320 if (status != 0)
9b073574
TM		 3321 goto out;
3322 /* Is this a delegated lock? */
3323 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3324 goto out;
8d0a8a9d 3325 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3326 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3327 status = -ENOMEM;
911d1aaf 3328 if (seqid == NULL)
9b073574 3329 goto out;
cd3758e3 3330 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
a5d16a4d
TM		 3331 status = PTR_ERR(task);
3332 if (IS_ERR(task))
9b073574 3333 goto out;
a5d16a4d 3334 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3335 rpc_put_task(task);
9b073574 3336out:
1da177e4
LT		 3337 return status;
3338}
3339
a5d16a4d
TM		 3340struct nfs4_lockdata {
3341 struct nfs_lock_args arg;
3342 struct nfs_lock_res res;
3343 struct nfs4_lock_state *lsp;
3344 struct nfs_open_context *ctx;
3345 struct file_lock fl;
26e976a8 3346 unsigned long timestamp;
a5d16a4d
TM		 3347 int rpc_status;
3348 int cancelled;
3349};
3350
3351static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3352 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3353{
a5d16a4d
TM		 3354 struct nfs4_lockdata *p;
3355 struct inode *inode = lsp->ls_state->inode;
1da177e4 3356 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3357
3358 p = kzalloc(sizeof(*p), GFP_KERNEL);
3359 if (p == NULL)
3360 return NULL;
3361
3362 p->arg.fh = NFS_FH(inode);
3363 p->arg.fl = &p->fl;
2f74c0a0
TM		 3364 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3365 if (p->arg.open_seqid == NULL)
3366 goto out_free;
a5d16a4d
TM		 3367 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3368 if (p->arg.lock_seqid == NULL)
2f74c0a0 3369 goto out_free_seqid;
a5d16a4d 3370 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3371 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
9f958ab8 3372 p->arg.lock_owner.id = lsp->ls_id.id;
a5d16a4d
TM		 3373 p->lsp = lsp;
3374 atomic_inc(&lsp->ls_count);
3375 p->ctx = get_nfs_open_context(ctx);
3376 memcpy(&p->fl, fl, sizeof(p->fl));
3377 return p;
2f74c0a0
TM		 3378out_free_seqid:
3379 nfs_free_seqid(p->arg.open_seqid);
a5d16a4d
TM		 3380out_free:
3381 kfree(p);
3382 return NULL;
3383}
3384
3385static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3386{
3387 struct nfs4_lockdata *data = calldata;
3388 struct nfs4_state *state = data->lsp->ls_state;
3389 struct nfs4_state_owner *sp = state->owner;
1da177e4 3390 struct rpc_message msg = {
a5d16a4d
TM		 3391 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3392 .rpc_argp = &data->arg,
3393 .rpc_resp = &data->res,
3394 .rpc_cred = sp->so_cred,
1da177e4 3395 };
06735b34 3396
a5d16a4d 3397 dprintk("%s: begin!\n", __FUNCTION__);
2f74c0a0
TM		 3398 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3399 return;
a5d16a4d
TM		 3400 /* Do we need to do an open_to_lock_owner? */
3401 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
e6e21970
TM		 3402 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3403 return;
a5d16a4d
TM		 3404 data->arg.open_stateid = &state->stateid;
3405 data->arg.new_lock_owner = 1;
2f74c0a0
TM		 3406 } else
3407 data->arg.new_lock_owner = 0;
26e976a8 3408 data->timestamp = jiffies;
a5d16a4d 3409 rpc_call_setup(task, &msg, 0);
a5d16a4d
TM		 3410 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3411}
3412
3413static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3414{
3415 struct nfs4_lockdata *data = calldata;
3416
3417 dprintk("%s: begin!\n", __FUNCTION__);
3418
3419 data->rpc_status = task->tk_status;
3420 if (RPC_ASSASSINATED(task))
3421 goto out;
3422 if (data->arg.new_lock_owner != 0) {
3423 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3424 if (data->rpc_status == 0)
3425 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3426 else
3427 goto out;
3428 }
3429 if (data->rpc_status == 0) {
3430 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3431 sizeof(data->lsp->ls_stateid.data));
3432 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3433 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3434 }
3435 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3436out:
3437 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3438}
3439
3440static void nfs4_lock_release(void *calldata)
3441{
3442 struct nfs4_lockdata *data = calldata;
3443
3444 dprintk("%s: begin!\n", __FUNCTION__);
2f74c0a0 3445 nfs_free_seqid(data->arg.open_seqid);
a5d16a4d
TM		 3446 if (data->cancelled != 0) {
3447 struct rpc_task *task;
3448 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3449 data->arg.lock_seqid);
3450 if (!IS_ERR(task))
e6b3c4db 3451 rpc_put_task(task);
a5d16a4d
TM		 3452 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3453 } else
3454 nfs_free_seqid(data->arg.lock_seqid);
3455 nfs4_put_lock_state(data->lsp);
3456 put_nfs_open_context(data->ctx);
3457 kfree(data);
3458 dprintk("%s: done!\n", __FUNCTION__);
3459}
3460
3461static const struct rpc_call_ops nfs4_lock_ops = {
3462 .rpc_call_prepare = nfs4_lock_prepare,
3463 .rpc_call_done = nfs4_lock_done,
3464 .rpc_release = nfs4_lock_release,
3465};
3466
3467static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3468{
3469 struct nfs4_lockdata *data;
3470 struct rpc_task *task;
c970aa85
TM		 3471 struct rpc_task_setup task_setup_data = {
3472 .rpc_client = NFS_CLIENT(state->inode),
3473 .callback_ops = &nfs4_lock_ops,
3474 .flags = RPC_TASK_ASYNC,
3475 };
a5d16a4d
TM		 3476 int ret;
3477
3478 dprintk("%s: begin!\n", __FUNCTION__);
cd3758e3 3479 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
a5d16a4d
TM		 3480 fl->fl_u.nfs4_fl.owner);
3481 if (data == NULL)
3482 return -ENOMEM;
3483 if (IS_SETLKW(cmd))
3484 data->arg.block = 1;
3485 if (reclaim != 0)
3486 data->arg.reclaim = 1;
c970aa85
TM		 3487 task_setup_data.callback_data = data;
3488 task = rpc_run_task(&task_setup_data);
7a1218a2 3489 if (IS_ERR(task))
a5d16a4d 3490 return PTR_ERR(task);
a5d16a4d
TM		 3491 ret = nfs4_wait_for_completion_rpc_task(task);
3492 if (ret == 0) {
3493 ret = data->rpc_status;
3494 if (ret == -NFS4ERR_DENIED)
3495 ret = -EAGAIN;
3496 } else
3497 data->cancelled = 1;
e6b3c4db 3498 rpc_put_task(task);
a5d16a4d
TM		 3499 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3500 return ret;
1da177e4
LT		 3501}
3502
3503static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3504{
202b50dc
TM		 3505 struct nfs_server *server = NFS_SERVER(state->inode);
3506 struct nfs4_exception exception = { };
3507 int err;
3508
3509 do {
42a2d13e
TM		 3510 /* Cache the lock if possible... */
3511 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3512 return 0;
202b50dc
TM		 3513 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3514 if (err != -NFS4ERR_DELAY)
3515 break;
3516 nfs4_handle_exception(server, err, &exception);
3517 } while (exception.retry);
3518 return err;
1da177e4
LT		 3519}
3520
3521static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3522{
202b50dc
TM		 3523 struct nfs_server *server = NFS_SERVER(state->inode);
3524 struct nfs4_exception exception = { };
3525 int err;
3526
6bfc93ef
TM		 3527 err = nfs4_set_lock_state(state, request);
3528 if (err != 0)
3529 return err;
202b50dc 3530 do {
42a2d13e
TM		 3531 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3532 return 0;
202b50dc
TM		 3533 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3534 if (err != -NFS4ERR_DELAY)
3535 break;
3536 nfs4_handle_exception(server, err, &exception);
3537 } while (exception.retry);
3538 return err;
1da177e4
LT		 3539}
3540
3541static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3542{
adfa6f98 3543 struct nfs_client *clp = state->owner->so_client;
01c3b861 3544 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3545 int status;
3546
6bfc93ef 3547 /* Is this a delegated open? */
6bfc93ef
TM		 3548 status = nfs4_set_lock_state(state, request);
3549 if (status != 0)
3550 goto out;
01c3b861
TM		 3551 request->fl_flags |= FL_ACCESS;
3552 status = do_vfs_lock(request->fl_file, request);
3553 if (status < 0)
3554 goto out;
3555 down_read(&clp->cl_sem);
3556 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3557 struct nfs_inode *nfsi = NFS_I(state->inode);
3558 /* Yes: cache locks! */
3559 down_read(&nfsi->rwsem);
3560 /* ...but avoid races with delegation recall... */
3561 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3562 request->fl_flags = fl_flags & ~FL_SLEEP;
3563 status = do_vfs_lock(request->fl_file, request);
3564 up_read(&nfsi->rwsem);
3565 goto out_unlock;
3566 }
3567 up_read(&nfsi->rwsem);
3568 }
6bfc93ef
TM		 3569 status = _nfs4_do_setlk(state, cmd, request, 0);
3570 if (status != 0)
01c3b861 3571 goto out_unlock;
6bfc93ef 3572 /* Note: we always want to sleep here! */
01c3b861 3573 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3574 if (do_vfs_lock(request->fl_file, request) < 0)
3575 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3576out_unlock:
1da177e4 3577 up_read(&clp->cl_sem);
01c3b861
TM		 3578out:
3579 request->fl_flags = fl_flags;
1da177e4
LT		 3580 return status;
3581}
3582
3583static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3584{
3585 struct nfs4_exception exception = { };
3586 int err;
3587
3588 do {
3589 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3590 _nfs4_proc_setlk(state, cmd, request),
3591 &exception);
3592 } while (exception.retry);
3593 return err;
3594}
3595
3596static int
3597nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3598{
3599 struct nfs_open_context *ctx;
3600 struct nfs4_state *state;
3601 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3602 int status;
3603
3604 /* verify open state */
cd3758e3 3605 ctx = nfs_file_open_context(filp);
1da177e4
LT		 3606 state = ctx->state;
3607
3608 if (request->fl_start < 0 || request->fl_end < 0)
3609 return -EINVAL;
3610
3611 if (IS_GETLK(cmd))
3612 return nfs4_proc_getlk(state, F_GETLK, request);
3613
3614 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3615 return -EINVAL;
3616
3617 if (request->fl_type == F_UNLCK)
3618 return nfs4_proc_unlck(state, cmd, request);
3619
3620 do {
3621 status = nfs4_proc_setlk(state, cmd, request);
3622 if ((status != -EAGAIN) || IS_SETLK(cmd))
3623 break;
3624 timeout = nfs4_set_lock_task_retry(timeout);
3625 status = -ERESTARTSYS;
3626 if (signalled())
3627 break;
3628 } while(status < 0);
1da177e4
LT		 3629 return status;
3630}
3631
888e694c
TM		 3632int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3633{
3634 struct nfs_server *server = NFS_SERVER(state->inode);
3635 struct nfs4_exception exception = { };
3636 int err;
3637
3638 err = nfs4_set_lock_state(state, fl);
3639 if (err != 0)
3640 goto out;
3641 do {
3642 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3643 if (err != -NFS4ERR_DELAY)
3644 break;
3645 err = nfs4_handle_exception(server, err, &exception);
3646 } while (exception.retry);
3647out:
3648 return err;
3649}
6b3b5496 3650
aa1870af
BF		 3651#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3652
6b3b5496
BF		 3653int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3654 size_t buflen, int flags)
3655{
4b580ee3
BF		 3656 struct inode *inode = dentry->d_inode;
3657
3658 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3659 return -EOPNOTSUPP;
3660
3661 if (!S_ISREG(inode->i_mode) &&
3662 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3663 return -EPERM;
3664
3665 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3666}
3667
3668/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3669 * and that's what we'll do for e.g. user attributes that haven't been set.
3670 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3671 * attributes in kernel-managed attribute namespaces. */
3672ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3673 size_t buflen)
3674{
aa1870af
BF		 3675 struct inode *inode = dentry->d_inode;
3676
3677 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3678 return -EOPNOTSUPP;
3679
3680 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3681}
3682
3683ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3684{
aa1870af 3685 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3686
096455a2
BF		 3687 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3688 return 0;
6b3b5496
BF		 3689 if (buf && buflen < len)
3690 return -ERANGE;
3691 if (buf)
aa1870af
BF		 3692 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3693 return len;
6b3b5496
BF		 3694}
3695
56659e99 3696int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
7aaa0b3b 3697 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3698{
3699 struct nfs_server *server = NFS_SERVER(dir);
3700 u32 bitmask[2] = {
361e624f
MN		 3701 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3702 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3703 };
3704 struct nfs4_fs_locations_arg args = {
3705 .dir_fh = NFS_FH(dir),
c228fd3a 3706 .name = name,
683b57b4
TM		 3707 .page = page,
3708 .bitmask = bitmask,
3709 };
3710 struct rpc_message msg = {
3711 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3712 .rpc_argp = &args,
7aaa0b3b 3713 .rpc_resp = fs_locations,
683b57b4
TM		 3714 };
3715 int status;
3716
3717 dprintk("%s: start\n", __FUNCTION__);
c228fd3a 3718 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3719 fs_locations->server = server;
830b8e33 3720 fs_locations->nlocations = 0;
683b57b4
TM		 3721 status = rpc_call_sync(server->client, &msg, 0);
3722 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3723 return status;
3724}
3725
1da177e4
LT		 3726struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3727 .recover_open = nfs4_open_reclaim,
3728 .recover_lock = nfs4_lock_reclaim,
3729};
3730
3731struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3732 .recover_open = nfs4_open_expired,
3733 .recover_lock = nfs4_lock_expired,
3734};
3735
92e1d5be 3736static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3737 .permission = nfs_permission,
3738 .getattr = nfs_getattr,
3739 .setattr = nfs_setattr,
3740 .getxattr = nfs4_getxattr,
3741 .setxattr = nfs4_setxattr,
3742 .listxattr = nfs4_listxattr,
3743};
3744
509de811 3745const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3746 .version = 4, /* protocol version */
3747 .dentry_ops = &nfs4_dentry_operations,
3748 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3749 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3750 .getroot = nfs4_proc_get_root,
3751 .getattr = nfs4_proc_getattr,
3752 .setattr = nfs4_proc_setattr,
2b3de441 3753 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3754 .lookup = nfs4_proc_lookup,
3755 .access = nfs4_proc_access,
3756 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3757 .create = nfs4_proc_create,
3758 .remove = nfs4_proc_remove,
3759 .unlink_setup = nfs4_proc_unlink_setup,
3760 .unlink_done = nfs4_proc_unlink_done,
3761 .rename = nfs4_proc_rename,
3762 .link = nfs4_proc_link,
3763 .symlink = nfs4_proc_symlink,
3764 .mkdir = nfs4_proc_mkdir,
3765 .rmdir = nfs4_proc_remove,
3766 .readdir = nfs4_proc_readdir,
3767 .mknod = nfs4_proc_mknod,
3768 .statfs = nfs4_proc_statfs,
3769 .fsinfo = nfs4_proc_fsinfo,
3770 .pathconf = nfs4_proc_pathconf,
e9326dca 3771 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3772 .decode_dirent = nfs4_decode_dirent,
3773 .read_setup = nfs4_proc_read_setup,
ec06c096 3774 .read_done = nfs4_read_done,
1da177e4 3775 .write_setup = nfs4_proc_write_setup,
788e7a89 3776 .write_done = nfs4_write_done,
1da177e4 3777 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3778 .commit_done = nfs4_commit_done,
02a913a7
TM		 3779 .file_open = nfs_open,
3780 .file_release = nfs_release,
1da177e4 3781 .lock = nfs4_proc_lock,
e50a1c2e 3782 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3783};
3784
3785/*
3786 * Local variables:
3787 * c-basic-offset: 8
3788 * End:
3789 */
Linux 6.x block layer and io_uring tree(s)