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locks: create posix-to-flock helper functions
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
006ea73e 54#include "iostat.h"
1da177e4
LT		 55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
2066fe89 58#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
cdd4e68b 61struct nfs4_opendata;
864472e9 62static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
1da177e4 65static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
faf5f49c 66static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
adfa6f98 67static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
1da177e4 68
1da177e4
LT		 69/* Prevent leaks of NFSv4 errors into userland */
70int nfs4_map_errors(int err)
71{
72 if (err < -1000) {
73 dprintk("%s could not handle NFSv4 error %d\n",
74 __FUNCTION__, -err);
75 return -EIO;
76 }
77 return err;
78}
79
80/*
81 * This is our standard bitmap for GETATTR requests.
82 */
83const u32 nfs4_fattr_bitmap[2] = {
84 FATTR4_WORD0_TYPE
85 | FATTR4_WORD0_CHANGE
86 | FATTR4_WORD0_SIZE
87 | FATTR4_WORD0_FSID
88 | FATTR4_WORD0_FILEID,
89 FATTR4_WORD1_MODE
90 | FATTR4_WORD1_NUMLINKS
91 | FATTR4_WORD1_OWNER
92 | FATTR4_WORD1_OWNER_GROUP
93 | FATTR4_WORD1_RAWDEV
94 | FATTR4_WORD1_SPACE_USED
95 | FATTR4_WORD1_TIME_ACCESS
96 | FATTR4_WORD1_TIME_METADATA
97 | FATTR4_WORD1_TIME_MODIFY
98};
99
100const u32 nfs4_statfs_bitmap[2] = {
101 FATTR4_WORD0_FILES_AVAIL
102 | FATTR4_WORD0_FILES_FREE
103 | FATTR4_WORD0_FILES_TOTAL,
104 FATTR4_WORD1_SPACE_AVAIL
105 | FATTR4_WORD1_SPACE_FREE
106 | FATTR4_WORD1_SPACE_TOTAL
107};
108
4ce79717 109const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 110 FATTR4_WORD0_MAXLINK
111 | FATTR4_WORD0_MAXNAME,
112 0
113};
114
115const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
116 | FATTR4_WORD0_MAXREAD
117 | FATTR4_WORD0_MAXWRITE
118 | FATTR4_WORD0_LEASE_TIME,
119 0
120};
121
830b8e33
MN		 122const u32 nfs4_fs_locations_bitmap[2] = {
123 FATTR4_WORD0_TYPE
124 | FATTR4_WORD0_CHANGE
125 | FATTR4_WORD0_SIZE
126 | FATTR4_WORD0_FSID
127 | FATTR4_WORD0_FILEID
128 | FATTR4_WORD0_FS_LOCATIONS,
129 FATTR4_WORD1_MODE
130 | FATTR4_WORD1_NUMLINKS
131 | FATTR4_WORD1_OWNER
132 | FATTR4_WORD1_OWNER_GROUP
133 | FATTR4_WORD1_RAWDEV
134 | FATTR4_WORD1_SPACE_USED
135 | FATTR4_WORD1_TIME_ACCESS
136 | FATTR4_WORD1_TIME_METADATA
137 | FATTR4_WORD1_TIME_MODIFY
138 | FATTR4_WORD1_MOUNTED_ON_FILEID
139};
140
bc4785cd 141static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 142 struct nfs4_readdir_arg *readdir)
143{
0dbb4c67 144 __be32 *start, *p;
1da177e4
LT		 145
146 BUG_ON(readdir->count < 80);
147 if (cookie > 2) {
b7ef1956 148 readdir->cookie = cookie;
1da177e4
LT		 149 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
150 return;
151 }
152
153 readdir->cookie = 0;
154 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
155 if (cookie == 2)
156 return;
157
158 /*
159 * NFSv4 servers do not return entries for '.' and '..'
160 * Therefore, we fake these entries here. We let '.'
161 * have cookie 0 and '..' have cookie 1. Note that
162 * when talking to the server, we always send cookie 0
163 * instead of 1 or 2.
164 */
0dbb4c67 165 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 166
167 if (cookie == 0) {
168 *p++ = xdr_one; /* next */
169 *p++ = xdr_zero; /* cookie, first word */
170 *p++ = xdr_one; /* cookie, second word */
171 *p++ = xdr_one; /* entry len */
172 memcpy(p, ".\0\0\0", 4); /* entry */
173 p++;
174 *p++ = xdr_one; /* bitmap length */
175 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
176 *p++ = htonl(8); /* attribute buffer length */
177 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
178 }
179
180 *p++ = xdr_one; /* next */
181 *p++ = xdr_zero; /* cookie, first word */
182 *p++ = xdr_two; /* cookie, second word */
183 *p++ = xdr_two; /* entry len */
184 memcpy(p, "..\0\0", 4); /* entry */
185 p++;
186 *p++ = xdr_one; /* bitmap length */
187 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
188 *p++ = htonl(8); /* attribute buffer length */
189 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
190
191 readdir->pgbase = (char *)p - (char *)start;
192 readdir->count -= readdir->pgbase;
193 kunmap_atomic(start, KM_USER0);
194}
195
26e976a8 196static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 197{
7539bbab 198 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 199 spin_lock(&clp->cl_lock);
200 if (time_before(clp->cl_last_renewal,timestamp))
201 clp->cl_last_renewal = timestamp;
202 spin_unlock(&clp->cl_lock);
203}
204
38478b24 205static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 206{
38478b24 207 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 208
38478b24
TM		 209 spin_lock(&dir->i_lock);
210 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
1da177e4
LT		 211 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
212 nfsi->change_attr = cinfo->after;
38478b24 213 spin_unlock(&dir->i_lock);
1da177e4
LT		 214}
215
e56e0b78 216struct nfs4_opendata {
24ac23ab 217 atomic_t count;
e56e0b78
TM		 218 struct nfs_openargs o_arg;
219 struct nfs_openres o_res;
cdd4e68b
TM		 220 struct nfs_open_confirmargs c_arg;
221 struct nfs_open_confirmres c_res;
e56e0b78
TM		 222 struct nfs_fattr f_attr;
223 struct nfs_fattr dir_attr;
224 struct dentry *dentry;
225 struct dentry *dir;
226 struct nfs4_state_owner *owner;
227 struct iattr attrs;
26e976a8 228 unsigned long timestamp;
24ac23ab
TM		 229 int rpc_status;
230 int cancelled;
e56e0b78
TM		 231};
232
233static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
234 struct nfs4_state_owner *sp, int flags,
235 const struct iattr *attrs)
236{
237 struct dentry *parent = dget_parent(dentry);
238 struct inode *dir = parent->d_inode;
239 struct nfs_server *server = NFS_SERVER(dir);
240 struct nfs4_opendata *p;
241
242 p = kzalloc(sizeof(*p), GFP_KERNEL);
243 if (p == NULL)
244 goto err;
245 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
246 if (p->o_arg.seqid == NULL)
247 goto err_free;
24ac23ab 248 atomic_set(&p->count, 1);
e56e0b78
TM		 249 p->dentry = dget(dentry);
250 p->dir = parent;
251 p->owner = sp;
252 atomic_inc(&sp->so_count);
253 p->o_arg.fh = NFS_FH(dir);
254 p->o_arg.open_flags = flags,
7539bbab 255 p->o_arg.clientid = server->nfs_client->cl_clientid;
e56e0b78
TM		 256 p->o_arg.id = sp->so_id;
257 p->o_arg.name = &dentry->d_name;
258 p->o_arg.server = server;
259 p->o_arg.bitmask = server->attr_bitmask;
260 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
261 p->o_res.f_attr = &p->f_attr;
262 p->o_res.dir_attr = &p->dir_attr;
263 p->o_res.server = server;
264 nfs_fattr_init(&p->f_attr);
265 nfs_fattr_init(&p->dir_attr);
266 if (flags & O_EXCL) {
267 u32 *s = (u32 *) p->o_arg.u.verifier.data;
268 s[0] = jiffies;
269 s[1] = current->pid;
270 } else if (flags & O_CREAT) {
271 p->o_arg.u.attrs = &p->attrs;
272 memcpy(&p->attrs, attrs, sizeof(p->attrs));
273 }
cdd4e68b
TM		 274 p->c_arg.fh = &p->o_res.fh;
275 p->c_arg.stateid = &p->o_res.stateid;
276 p->c_arg.seqid = p->o_arg.seqid;
e56e0b78
TM		 277 return p;
278err_free:
279 kfree(p);
280err:
281 dput(parent);
282 return NULL;
283}
284
285static void nfs4_opendata_free(struct nfs4_opendata *p)
286{
24ac23ab 287 if (p != NULL && atomic_dec_and_test(&p->count)) {
e56e0b78
TM		 288 nfs_free_seqid(p->o_arg.seqid);
289 nfs4_put_state_owner(p->owner);
290 dput(p->dir);
291 dput(p->dentry);
292 kfree(p);
293 }
294}
295
9512135d 296/* Helper for asynchronous RPC calls */
4ce70ada 297static int nfs4_call_async(struct rpc_clnt *clnt,
963d8fe5 298 const struct rpc_call_ops *tk_ops, void *calldata)
9512135d
TM		 299{
300 struct rpc_task *task;
301
963d8fe5 302 if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
9512135d 303 return -ENOMEM;
9512135d
TM		 304 rpc_execute(task);
305 return 0;
306}
307
06f814a3
TM		 308static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
309{
310 sigset_t oldset;
311 int ret;
312
313 rpc_clnt_sigmask(task->tk_client, &oldset);
314 ret = rpc_wait_for_completion_task(task);
315 rpc_clnt_sigunmask(task->tk_client, &oldset);
316 return ret;
317}
318
e7616923
TM		 319static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
320{
321 switch (open_flags) {
322 case FMODE_WRITE:
323 state->n_wronly++;
324 break;
325 case FMODE_READ:
326 state->n_rdonly++;
327 break;
328 case FMODE_READ|FMODE_WRITE:
329 state->n_rdwr++;
330 }
331}
332
1da177e4
LT		 333static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
334{
335 struct inode *inode = state->inode;
336
337 open_flags &= (FMODE_READ|FMODE_WRITE);
d530838b 338 /* Protect against nfs4_find_state_byowner() */
ec073428 339 spin_lock(&state->owner->so_lock);
1da177e4 340 spin_lock(&inode->i_lock);
4cecb76f 341 memcpy(&state->stateid, stateid, sizeof(state->stateid));
e7616923 342 update_open_stateflags(state, open_flags);
4cecb76f 343 nfs4_state_set_mode_locked(state, state->state | open_flags);
1da177e4 344 spin_unlock(&inode->i_lock);
ec073428 345 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 346}
347
24ac23ab
TM		 348static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
349{
350 struct inode *inode;
351 struct nfs4_state *state = NULL;
352
353 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
354 goto out;
355 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
03f28e3a 356 if (IS_ERR(inode))
24ac23ab
TM		 357 goto out;
358 state = nfs4_get_open_state(inode, data->owner);
359 if (state == NULL)
360 goto put_inode;
361 update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
362put_inode:
363 iput(inode);
364out:
365 return state;
366}
367
864472e9
TM		 368static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
369{
370 struct nfs_inode *nfsi = NFS_I(state->inode);
371 struct nfs_open_context *ctx;
372
373 spin_lock(&state->inode->i_lock);
374 list_for_each_entry(ctx, &nfsi->open_files, list) {
375 if (ctx->state != state)
376 continue;
377 get_nfs_open_context(ctx);
378 spin_unlock(&state->inode->i_lock);
379 return ctx;
380 }
381 spin_unlock(&state->inode->i_lock);
382 return ERR_PTR(-ENOENT);
383}
384
385static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
386{
387 int ret;
388
389 opendata->o_arg.open_flags = openflags;
390 ret = _nfs4_proc_open(opendata);
391 if (ret != 0)
392 return ret;
393 memcpy(stateid->data, opendata->o_res.stateid.data,
394 sizeof(stateid->data));
395 return 0;
396}
397
398static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
399{
400 nfs4_stateid stateid;
401 struct nfs4_state *newstate;
402 int mode = 0;
403 int delegation = 0;
404 int ret;
405
406 /* memory barrier prior to reading state->n_* */
407 smp_rmb();
408 if (state->n_rdwr != 0) {
409 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
410 if (ret != 0)
411 return ret;
412 mode |= FMODE_READ|FMODE_WRITE;
413 if (opendata->o_res.delegation_type != 0)
414 delegation = opendata->o_res.delegation_type;
415 smp_rmb();
416 }
417 if (state->n_wronly != 0) {
418 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
419 if (ret != 0)
420 return ret;
421 mode |= FMODE_WRITE;
422 if (opendata->o_res.delegation_type != 0)
423 delegation = opendata->o_res.delegation_type;
424 smp_rmb();
425 }
426 if (state->n_rdonly != 0) {
427 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
428 if (ret != 0)
429 return ret;
430 mode |= FMODE_READ;
431 }
432 clear_bit(NFS_DELEGATED_STATE, &state->flags);
433 if (mode == 0)
434 return 0;
435 if (opendata->o_res.delegation_type == 0)
436 opendata->o_res.delegation_type = delegation;
437 opendata->o_arg.open_flags |= mode;
438 newstate = nfs4_opendata_to_nfs4_state(opendata);
439 if (newstate != NULL) {
440 if (opendata->o_res.delegation_type != 0) {
441 struct nfs_inode *nfsi = NFS_I(newstate->inode);
442 int delegation_flags = 0;
443 if (nfsi->delegation)
444 delegation_flags = nfsi->delegation->flags;
445 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
446 nfs_inode_set_delegation(newstate->inode,
447 opendata->owner->so_cred,
448 &opendata->o_res);
449 else
450 nfs_inode_reclaim_delegation(newstate->inode,
451 opendata->owner->so_cred,
452 &opendata->o_res);
453 }
454 nfs4_close_state(newstate, opendata->o_arg.open_flags);
455 }
456 if (newstate != state)
457 return -ESTALE;
458 return 0;
459}
460
1da177e4
LT		 461/*
462 * OPEN_RECLAIM:
463 * reclaim state on the server after a reboot.
1da177e4 464 */
864472e9 465static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
1da177e4 466{
864472e9
TM		 467 struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
468 struct nfs4_opendata *opendata;
469 int delegation_type = 0;
1da177e4
LT		 470 int status;
471
472 if (delegation != NULL) {
473 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
474 memcpy(&state->stateid, &delegation->stateid,
475 sizeof(state->stateid));
476 set_bit(NFS_DELEGATED_STATE, &state->flags);
477 return 0;
478 }
864472e9 479 delegation_type = delegation->type;
1da177e4 480 }
864472e9
TM		 481 opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
482 if (opendata == NULL)
cee54fc9 483 return -ENOMEM;
864472e9
TM		 484 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
485 opendata->o_arg.fh = NFS_FH(state->inode);
486 nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
487 opendata->o_arg.u.delegation_type = delegation_type;
488 status = nfs4_open_recover(opendata, state);
489 nfs4_opendata_free(opendata);
1da177e4
LT		 490 return status;
491}
492
864472e9 493static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
1da177e4
LT		 494{
495 struct nfs_server *server = NFS_SERVER(state->inode);
496 struct nfs4_exception exception = { };
497 int err;
498 do {
864472e9 499 err = _nfs4_do_open_reclaim(sp, state, dentry);
202b50dc
TM		 500 if (err != -NFS4ERR_DELAY)
501 break;
502 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 503 } while (exception.retry);
504 return err;
505}
506
864472e9
TM		 507static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
508{
509 struct nfs_open_context *ctx;
510 int ret;
511
512 ctx = nfs4_state_find_open_context(state);
513 if (IS_ERR(ctx))
514 return PTR_ERR(ctx);
515 ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
516 put_nfs_open_context(ctx);
517 return ret;
518}
519
1da177e4
LT		 520static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
521{
522 struct nfs4_state_owner *sp = state->owner;
e56e0b78 523 struct nfs4_opendata *opendata;
864472e9 524 int ret;
1da177e4 525
1da177e4 526 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
864472e9
TM		 527 return 0;
528 opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
e56e0b78 529 if (opendata == NULL)
864472e9 530 return -ENOMEM;
e56e0b78 531 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
e56e0b78
TM		 532 memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
533 sizeof(opendata->o_arg.u.delegation.data));
864472e9 534 ret = nfs4_open_recover(opendata, state);
e56e0b78 535 nfs4_opendata_free(opendata);
864472e9 536 return ret;
1da177e4
LT		 537}
538
539int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
540{
541 struct nfs4_exception exception = { };
542 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
543 int err;
544 do {
545 err = _nfs4_open_delegation_recall(dentry, state);
546 switch (err) {
547 case 0:
548 return err;
549 case -NFS4ERR_STALE_CLIENTID:
550 case -NFS4ERR_STALE_STATEID:
551 case -NFS4ERR_EXPIRED:
552 /* Don't recall a delegation if it was lost */
7539bbab 553 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 554 return err;
555 }
556 err = nfs4_handle_exception(server, err, &exception);
557 } while (exception.retry);
558 return err;
559}
560
cdd4e68b 561static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1da177e4 562{
cdd4e68b
TM		 563 struct nfs4_opendata *data = calldata;
564 struct rpc_message msg = {
565 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
566 .rpc_argp = &data->c_arg,
567 .rpc_resp = &data->c_res,
568 .rpc_cred = data->owner->so_cred,
1da177e4 569 };
26e976a8 570 data->timestamp = jiffies;
cdd4e68b
TM		 571 rpc_call_setup(task, &msg, 0);
572}
573
574static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
575{
576 struct nfs4_opendata *data = calldata;
577
578 data->rpc_status = task->tk_status;
579 if (RPC_ASSASSINATED(task))
580 return;
26e976a8 581 if (data->rpc_status == 0) {
cdd4e68b
TM		 582 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
583 sizeof(data->o_res.stateid.data));
26e976a8
TM		 584 renew_lease(data->o_res.server, data->timestamp);
585 }
cdd4e68b
TM		 586 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
587 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
588}
589
590static void nfs4_open_confirm_release(void *calldata)
591{
592 struct nfs4_opendata *data = calldata;
593 struct nfs4_state *state = NULL;
594
595 /* If this request hasn't been cancelled, do nothing */
596 if (data->cancelled == 0)
597 goto out_free;
598 /* In case of error, no cleanup! */
599 if (data->rpc_status != 0)
600 goto out_free;
601 nfs_confirm_seqid(&data->owner->so_seqid, 0);
602 state = nfs4_opendata_to_nfs4_state(data);
603 if (state != NULL)
604 nfs4_close_state(state, data->o_arg.open_flags);
605out_free:
606 nfs4_opendata_free(data);
607}
608
609static const struct rpc_call_ops nfs4_open_confirm_ops = {
610 .rpc_call_prepare = nfs4_open_confirm_prepare,
611 .rpc_call_done = nfs4_open_confirm_done,
612 .rpc_release = nfs4_open_confirm_release,
613};
614
615/*
616 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
617 */
618static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
619{
620 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
621 struct rpc_task *task;
1da177e4
LT		 622 int status;
623
cdd4e68b 624 atomic_inc(&data->count);
7a1218a2
TM		 625 /*
626 * If rpc_run_task() ends up calling ->rpc_release(), we
627 * want to ensure that it takes the 'error' code path.
628 */
629 data->rpc_status = -ENOMEM;
cdd4e68b 630 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
7a1218a2 631 if (IS_ERR(task))
cdd4e68b 632 return PTR_ERR(task);
cdd4e68b
TM		 633 status = nfs4_wait_for_completion_rpc_task(task);
634 if (status != 0) {
635 data->cancelled = 1;
636 smp_wmb();
637 } else
638 status = data->rpc_status;
e6b3c4db 639 rpc_put_task(task);
1da177e4
LT		 640 return status;
641}
642
24ac23ab 643static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 644{
24ac23ab
TM		 645 struct nfs4_opendata *data = calldata;
646 struct nfs4_state_owner *sp = data->owner;
1da177e4
LT		 647 struct rpc_message msg = {
648 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
24ac23ab
TM		 649 .rpc_argp = &data->o_arg,
650 .rpc_resp = &data->o_res,
1da177e4
LT		 651 .rpc_cred = sp->so_cred,
652 };
24ac23ab
TM		 653
654 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
655 return;
656 /* Update sequence id. */
657 data->o_arg.id = sp->so_id;
658 data->o_arg.clientid = sp->so_client->cl_clientid;
864472e9
TM		 659 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
660 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
26e976a8 661 data->timestamp = jiffies;
24ac23ab
TM		 662 rpc_call_setup(task, &msg, 0);
663}
1da177e4 664
24ac23ab
TM		 665static void nfs4_open_done(struct rpc_task *task, void *calldata)
666{
667 struct nfs4_opendata *data = calldata;
1da177e4 668
24ac23ab
TM		 669 data->rpc_status = task->tk_status;
670 if (RPC_ASSASSINATED(task))
671 return;
672 if (task->tk_status == 0) {
673 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 674 case S_IFREG:
675 break;
676 case S_IFLNK:
24ac23ab 677 data->rpc_status = -ELOOP;
6f926b5b
TM		 678 break;
679 case S_IFDIR:
24ac23ab 680 data->rpc_status = -EISDIR;
6f926b5b
TM		 681 break;
682 default:
24ac23ab 683 data->rpc_status = -ENOTDIR;
6f926b5b 684 }
26e976a8 685 renew_lease(data->o_res.server, data->timestamp);
6f926b5b 686 }
24ac23ab
TM		 687 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
688}
6f926b5b 689
24ac23ab
TM		 690static void nfs4_open_release(void *calldata)
691{
692 struct nfs4_opendata *data = calldata;
693 struct nfs4_state *state = NULL;
694
695 /* If this request hasn't been cancelled, do nothing */
696 if (data->cancelled == 0)
697 goto out_free;
698 /* In case of error, no cleanup! */
699 if (data->rpc_status != 0)
700 goto out_free;
701 /* In case we need an open_confirm, no cleanup! */
702 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
703 goto out_free;
704 nfs_confirm_seqid(&data->owner->so_seqid, 0);
705 state = nfs4_opendata_to_nfs4_state(data);
706 if (state != NULL)
707 nfs4_close_state(state, data->o_arg.open_flags);
708out_free:
709 nfs4_opendata_free(data);
710}
711
712static const struct rpc_call_ops nfs4_open_ops = {
713 .rpc_call_prepare = nfs4_open_prepare,
714 .rpc_call_done = nfs4_open_done,
715 .rpc_release = nfs4_open_release,
716};
717
718/*
719 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
720 */
721static int _nfs4_proc_open(struct nfs4_opendata *data)
722{
723 struct inode *dir = data->dir->d_inode;
724 struct nfs_server *server = NFS_SERVER(dir);
725 struct nfs_openargs *o_arg = &data->o_arg;
726 struct nfs_openres *o_res = &data->o_res;
727 struct rpc_task *task;
728 int status;
729
730 atomic_inc(&data->count);
7a1218a2
TM		 731 /*
732 * If rpc_run_task() ends up calling ->rpc_release(), we
733 * want to ensure that it takes the 'error' code path.
734 */
735 data->rpc_status = -ENOMEM;
24ac23ab 736 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
7a1218a2 737 if (IS_ERR(task))
24ac23ab 738 return PTR_ERR(task);
24ac23ab
TM		 739 status = nfs4_wait_for_completion_rpc_task(task);
740 if (status != 0) {
741 data->cancelled = 1;
742 smp_wmb();
743 } else
744 status = data->rpc_status;
e6b3c4db 745 rpc_put_task(task);
1da177e4 746 if (status != 0)
24ac23ab
TM		 747 return status;
748
56ae19f3
TM		 749 if (o_arg->open_flags & O_CREAT) {
750 update_changeattr(dir, &o_res->cinfo);
751 nfs_post_op_update_inode(dir, o_res->dir_attr);
752 } else
753 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 754 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 755 status = _nfs4_proc_open_confirm(data);
1da177e4 756 if (status != 0)
24ac23ab 757 return status;
1da177e4 758 }
24ac23ab 759 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1da177e4 760 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
8fa5c000 761 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 762 return 0;
1da177e4
LT		 763}
764
765static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
766{
767 struct nfs_access_entry cache;
768 int mask = 0;
769 int status;
770
771 if (openflags & FMODE_READ)
772 mask |= MAY_READ;
773 if (openflags & FMODE_WRITE)
774 mask |= MAY_WRITE;
775 status = nfs_access_get_cached(inode, cred, &cache);
776 if (status == 0)
777 goto out;
778
779 /* Be clever: ask server to check for all possible rights */
780 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
781 cache.cred = cred;
782 cache.jiffies = jiffies;
783 status = _nfs4_proc_access(inode, &cache);
784 if (status != 0)
785 return status;
786 nfs_access_add_cache(inode, &cache);
787out:
788 if ((cache.mask & mask) == mask)
789 return 0;
790 return -EACCES;
791}
792
58d9714a
TM		 793int nfs4_recover_expired_lease(struct nfs_server *server)
794{
7539bbab 795 struct nfs_client *clp = server->nfs_client;
6b30954e 796 int ret;
58d9714a 797
6b30954e
TM		 798 for (;;) {
799 ret = nfs4_wait_clnt_recover(server->client, clp);
800 if (ret != 0)
801 return ret;
802 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
803 break;
58d9714a 804 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 805 }
806 return 0;
58d9714a
TM		 807}
808
1da177e4
LT		 809/*
810 * OPEN_EXPIRED:
811 * reclaim state on the server after a network partition.
812 * Assumes caller holds the appropriate lock
813 */
814static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
815{
1da177e4 816 struct inode *inode = state->inode;
1da177e4 817 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
e56e0b78 818 struct nfs4_opendata *opendata;
24ac23ab 819 int openflags = state->state & (FMODE_READ|FMODE_WRITE);
864472e9 820 int ret;
1da177e4
LT		 821
822 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
864472e9
TM		 823 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
824 if (ret < 0)
825 return ret;
1da177e4
LT		 826 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
827 set_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9 828 return 0;
1da177e4 829 }
24ac23ab 830 opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
e56e0b78 831 if (opendata == NULL)
864472e9
TM		 832 return -ENOMEM;
833 ret = nfs4_open_recover(opendata, state);
834 if (ret == -ESTALE) {
835 /* Invalidate the state owner so we don't ever use it again */
836 nfs4_drop_state_owner(sp);
837 d_drop(dentry);
1da177e4 838 }
e56e0b78 839 nfs4_opendata_free(opendata);
864472e9 840 return ret;
1da177e4
LT		 841}
842
202b50dc
TM		 843static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
844{
845 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
846 struct nfs4_exception exception = { };
847 int err;
848
849 do {
850 err = _nfs4_open_expired(sp, state, dentry);
851 if (err == -NFS4ERR_DELAY)
852 nfs4_handle_exception(server, err, &exception);
853 } while (exception.retry);
854 return err;
855}
856
1da177e4
LT		 857static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
858{
1da177e4 859 struct nfs_open_context *ctx;
864472e9 860 int ret;
1da177e4 861
864472e9
TM		 862 ctx = nfs4_state_find_open_context(state);
863 if (IS_ERR(ctx))
864 return PTR_ERR(ctx);
865 ret = nfs4_do_open_expired(sp, state, ctx->dentry);
866 put_nfs_open_context(ctx);
867 return ret;
1da177e4
LT		 868}
869
870/*
24ac23ab 871 * Returns a referenced nfs4_state if there is an open delegation on the file
1da177e4
LT		 872 */
873static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
874{
875 struct nfs_delegation *delegation;
876 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 877 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 878 struct nfs_inode *nfsi = NFS_I(inode);
879 struct nfs4_state_owner *sp = NULL;
880 struct nfs4_state *state = NULL;
881 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
882 int err;
883
b4454fe1
TM		 884 err = -ENOMEM;
885 if (!(sp = nfs4_get_state_owner(server, cred))) {
886 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
887 return err;
888 }
58d9714a
TM		 889 err = nfs4_recover_expired_lease(server);
890 if (err != 0)
b4454fe1 891 goto out_put_state_owner;
1da177e4
LT		 892 /* Protect against reboot recovery - NOTE ORDER! */
893 down_read(&clp->cl_sem);
894 /* Protect against delegation recall */
895 down_read(&nfsi->rwsem);
896 delegation = NFS_I(inode)->delegation;
897 err = -ENOENT;
898 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
899 goto out_err;
900 err = -ENOMEM;
1da177e4
LT		 901 state = nfs4_get_open_state(inode, sp);
902 if (state == NULL)
903 goto out_err;
904
905 err = -ENOENT;
906 if ((state->state & open_flags) == open_flags) {
907 spin_lock(&inode->i_lock);
e7616923 908 update_open_stateflags(state, open_flags);
1da177e4
LT		 909 spin_unlock(&inode->i_lock);
910 goto out_ok;
911 } else if (state->state != 0)
b4454fe1 912 goto out_put_open_state;
1da177e4
LT		 913
914 lock_kernel();
915 err = _nfs4_do_access(inode, cred, open_flags);
916 unlock_kernel();
917 if (err != 0)
b4454fe1 918 goto out_put_open_state;
1da177e4
LT		 919 set_bit(NFS_DELEGATED_STATE, &state->flags);
920 update_open_stateid(state, &delegation->stateid, open_flags);
921out_ok:
1da177e4
LT		 922 nfs4_put_state_owner(sp);
923 up_read(&nfsi->rwsem);
924 up_read(&clp->cl_sem);
1da177e4 925 *res = state;
b4454fe1
TM		 926 return 0;
927out_put_open_state:
928 nfs4_put_open_state(state);
1da177e4 929out_err:
1da177e4
LT		 930 up_read(&nfsi->rwsem);
931 up_read(&clp->cl_sem);
b8e5c4c2
TM		 932 if (err != -EACCES)
933 nfs_inode_return_delegation(inode);
b4454fe1
TM		 934out_put_state_owner:
935 nfs4_put_state_owner(sp);
1da177e4
LT		 936 return err;
937}
938
939static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
940{
941 struct nfs4_exception exception = { };
a162a6b8 942 struct nfs4_state *res = ERR_PTR(-EIO);
1da177e4
LT		 943 int err;
944
945 do {
946 err = _nfs4_open_delegated(inode, flags, cred, &res);
947 if (err == 0)
948 break;
949 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
950 err, &exception));
951 } while (exception.retry);
952 return res;
953}
954
955/*
24ac23ab 956 * Returns a referenced nfs4_state
1da177e4
LT		 957 */
958static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
959{
960 struct nfs4_state_owner *sp;
961 struct nfs4_state *state = NULL;
962 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 963 struct nfs_client *clp = server->nfs_client;
e56e0b78 964 struct nfs4_opendata *opendata;
1da177e4 965 int status;
1da177e4
LT		 966
967 /* Protect against reboot recovery conflicts */
1da177e4
LT		 968 status = -ENOMEM;
969 if (!(sp = nfs4_get_state_owner(server, cred))) {
970 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
971 goto out_err;
972 }
58d9714a
TM		 973 status = nfs4_recover_expired_lease(server);
974 if (status != 0)
b4454fe1 975 goto err_put_state_owner;
58d9714a
TM		 976 down_read(&clp->cl_sem);
977 status = -ENOMEM;
e56e0b78
TM		 978 opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
979 if (opendata == NULL)
76723de0 980 goto err_release_rwsem;
1da177e4 981
24ac23ab 982 status = _nfs4_proc_open(opendata);
1da177e4 983 if (status != 0)
e56e0b78 984 goto err_opendata_free;
1da177e4
LT		 985
986 status = -ENOMEM;
24ac23ab
TM		 987 state = nfs4_opendata_to_nfs4_state(opendata);
988 if (state == NULL)
e56e0b78 989 goto err_opendata_free;
e56e0b78 990 if (opendata->o_res.delegation_type != 0)
24ac23ab 991 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
e56e0b78 992 nfs4_opendata_free(opendata);
1da177e4
LT		 993 nfs4_put_state_owner(sp);
994 up_read(&clp->cl_sem);
995 *res = state;
996 return 0;
e56e0b78
TM		 997err_opendata_free:
998 nfs4_opendata_free(opendata);
76723de0
TM		 999err_release_rwsem:
1000 up_read(&clp->cl_sem);
e56e0b78
TM		 1001err_put_state_owner:
1002 nfs4_put_state_owner(sp);
1da177e4 1003out_err:
1da177e4
LT		 1004 *res = NULL;
1005 return status;
1006}
1007
1008
1009static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1010{
1011 struct nfs4_exception exception = { };
1012 struct nfs4_state *res;
1013 int status;
1014
1015 do {
1016 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1017 if (status == 0)
1018 break;
1019 /* NOTE: BAD_SEQID means the server and client disagree about the
1020 * book-keeping w.r.t. state-changing operations
1021 * (OPEN/CLOSE/LOCK/LOCKU...)
1022 * It is actually a sign of a bug on the client or on the server.
1023 *
1024 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1025 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1026 * have unhashed the old state_owner for us, and that we can
1027 * therefore safely retry using a new one. We should still warn
1028 * the user though...
1029 */
1030 if (status == -NFS4ERR_BAD_SEQID) {
1031 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1032 exception.retry = 1;
1033 continue;
1034 }
550f5747
TM		 1035 /*
1036 * BAD_STATEID on OPEN means that the server cancelled our
1037 * state before it received the OPEN_CONFIRM.
1038 * Recover by retrying the request as per the discussion
1039 * on Page 181 of RFC3530.
1040 */
1041 if (status == -NFS4ERR_BAD_STATEID) {
1042 exception.retry = 1;
1043 continue;
1044 }
1da177e4
LT		 1045 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1046 status, &exception));
1047 } while (exception.retry);
1048 return res;
1049}
1050
3e4f6290
TM		 1051static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1052 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1053{
3e4f6290 1054 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1055 struct nfs_setattrargs arg = {
3e4f6290 1056 .fh = NFS_FH(inode),
1da177e4
LT		 1057 .iap = sattr,
1058 .server = server,
1059 .bitmask = server->attr_bitmask,
1060 };
1061 struct nfs_setattrres res = {
1062 .fattr = fattr,
1063 .server = server,
1064 };
1065 struct rpc_message msg = {
1066 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1067 .rpc_argp = &arg,
1068 .rpc_resp = &res,
1069 };
26e976a8 1070 unsigned long timestamp = jiffies;
65e4308d 1071 int status;
1da177e4 1072
0e574af1 1073 nfs_fattr_init(fattr);
1da177e4 1074
3e4f6290
TM		 1075 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1076 /* Use that stateid */
1077 } else if (state != NULL) {
1da177e4 1078 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1079 nfs4_copy_stateid(&arg.stateid, state, current->files);
1080 } else
1da177e4
LT		 1081 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1082
65e4308d 1083 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1084 if (status == 0 && state != NULL)
1085 renew_lease(server, timestamp);
65e4308d 1086 return status;
1da177e4
LT		 1087}
1088
3e4f6290
TM		 1089static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1090 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1091{
3e4f6290 1092 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1093 struct nfs4_exception exception = { };
1094 int err;
1095 do {
1096 err = nfs4_handle_exception(server,
3e4f6290 1097 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1098 &exception);
1099 } while (exception.retry);
1100 return err;
1101}
1102
1103struct nfs4_closedata {
1104 struct inode *inode;
1105 struct nfs4_state *state;
1106 struct nfs_closeargs arg;
1107 struct nfs_closeres res;
516a6af6 1108 struct nfs_fattr fattr;
26e976a8 1109 unsigned long timestamp;
1da177e4
LT		 1110};
1111
963d8fe5 1112static void nfs4_free_closedata(void *data)
9512135d 1113{
963d8fe5
TM		 1114 struct nfs4_closedata *calldata = data;
1115 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1116
1117 nfs4_put_open_state(calldata->state);
1118 nfs_free_seqid(calldata->arg.seqid);
9512135d 1119 nfs4_put_state_owner(sp);
9512135d
TM		 1120 kfree(calldata);
1121}
1122
963d8fe5 1123static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1124{
963d8fe5 1125 struct nfs4_closedata *calldata = data;
1da177e4 1126 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1127 struct nfs_server *server = NFS_SERVER(calldata->inode);
1128
4ce70ada
TM		 1129 if (RPC_ASSASSINATED(task))
1130 return;
1da177e4
LT		 1131 /* hmm. we are done with the inode, and in the process of freeing
1132 * the state_owner. we keep this around to process errors
1133 */
cee54fc9 1134 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1135 switch (task->tk_status) {
1136 case 0:
1137 memcpy(&state->stateid, &calldata->res.stateid,
1138 sizeof(state->stateid));
26e976a8 1139 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1140 break;
1141 case -NFS4ERR_STALE_STATEID:
1142 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1143 break;
1144 default:
1145 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1146 rpc_restart_call(task);
1147 return;
1148 }
1149 }
516a6af6 1150 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1151}
1152
4ce70ada 1153static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1154{
4ce70ada 1155 struct nfs4_closedata *calldata = data;
9512135d 1156 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1157 struct rpc_message msg = {
1158 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1159 .rpc_argp = &calldata->arg,
1160 .rpc_resp = &calldata->res,
9512135d 1161 .rpc_cred = state->owner->so_cred,
1da177e4 1162 };
4cecb76f 1163 int mode = 0, old_mode;
9512135d 1164
963d8fe5 1165 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1166 return;
9512135d
TM		 1167 /* Recalculate the new open mode in case someone reopened the file
1168 * while we were waiting in line to be scheduled.
1169 */
4cecb76f
TM		 1170 spin_lock(&state->owner->so_lock);
1171 spin_lock(&calldata->inode->i_lock);
1172 mode = old_mode = state->state;
e7616923
TM		 1173 if (state->n_rdwr == 0) {
1174 if (state->n_rdonly == 0)
1175 mode &= ~FMODE_READ;
1176 if (state->n_wronly == 0)
1177 mode &= ~FMODE_WRITE;
1178 }
4cecb76f
TM		 1179 nfs4_state_set_mode_locked(state, mode);
1180 spin_unlock(&calldata->inode->i_lock);
1181 spin_unlock(&state->owner->so_lock);
1182 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
963d8fe5
TM		 1183 /* Note: exit _without_ calling nfs4_close_done */
1184 task->tk_action = NULL;
9512135d
TM		 1185 return;
1186 }
516a6af6 1187 nfs_fattr_init(calldata->res.fattr);
9512135d 1188 if (mode != 0)
1da177e4 1189 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d 1190 calldata->arg.open_flags = mode;
26e976a8 1191 calldata->timestamp = jiffies;
9512135d 1192 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1193}
1194
963d8fe5 1195static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1196 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1197 .rpc_call_done = nfs4_close_done,
1198 .rpc_release = nfs4_free_closedata,
1199};
1200
1da177e4
LT		 1201/*
1202 * It is possible for data to be read/written from a mem-mapped file
1203 * after the sys_close call (which hits the vfs layer as a flush).
1204 * This means that we can't safely call nfsv4 close on a file until
1205 * the inode is cleared. This in turn means that we are not good
1206 * NFSv4 citizens - we do not indicate to the server to update the file's
1207 * share state even when we are done with one of the three share
1208 * stateid's in the inode.
1209 *
1210 * NOTE: Caller must be holding the sp->so_owner semaphore!
1211 */
4cecb76f 1212int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1da177e4 1213{
516a6af6 1214 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1215 struct nfs4_closedata *calldata;
9512135d 1216 int status = -ENOMEM;
1da177e4 1217
9512135d 1218 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1219 if (calldata == NULL)
9512135d 1220 goto out;
1da177e4
LT		 1221 calldata->inode = inode;
1222 calldata->state = state;
1223 calldata->arg.fh = NFS_FH(inode);
9512135d 1224 calldata->arg.stateid = &state->stateid;
1da177e4 1225 /* Serialization for the sequence id */
cee54fc9 1226 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1227 if (calldata->arg.seqid == NULL)
1228 goto out_free_calldata;
516a6af6
TM		 1229 calldata->arg.bitmask = server->attr_bitmask;
1230 calldata->res.fattr = &calldata->fattr;
1231 calldata->res.server = server;
9512135d 1232
4ce70ada 1233 status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
9512135d
TM		 1234 if (status == 0)
1235 goto out;
1236
1237 nfs_free_seqid(calldata->arg.seqid);
1238out_free_calldata:
1239 kfree(calldata);
1240out:
1241 return status;
1da177e4
LT		 1242}
1243
95cf959b 1244static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
02a913a7
TM		 1245{
1246 struct file *filp;
1247
1248 filp = lookup_instantiate_filp(nd, dentry, NULL);
1249 if (!IS_ERR(filp)) {
1250 struct nfs_open_context *ctx;
1251 ctx = (struct nfs_open_context *)filp->private_data;
1252 ctx->state = state;
95cf959b
TM		 1253 return 0;
1254 }
1255 nfs4_close_state(state, nd->intent.open.flags);
1256 return PTR_ERR(filp);
02a913a7
TM		 1257}
1258
1259struct dentry *
1da177e4
LT		 1260nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1261{
1262 struct iattr attr;
1263 struct rpc_cred *cred;
1264 struct nfs4_state *state;
02a913a7 1265 struct dentry *res;
1da177e4
LT		 1266
1267 if (nd->flags & LOOKUP_CREATE) {
1268 attr.ia_mode = nd->intent.open.create_mode;
1269 attr.ia_valid = ATTR_MODE;
1270 if (!IS_POSIXACL(dir))
1271 attr.ia_mode &= ~current->fs->umask;
1272 } else {
1273 attr.ia_valid = 0;
1274 BUG_ON(nd->intent.open.flags & O_CREAT);
1275 }
1276
1f163415 1277 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1278 if (IS_ERR(cred))
02a913a7 1279 return (struct dentry *)cred;
1da177e4
LT		 1280 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1281 put_rpccred(cred);
02a913a7
TM		 1282 if (IS_ERR(state)) {
1283 if (PTR_ERR(state) == -ENOENT)
1284 d_add(dentry, NULL);
1285 return (struct dentry *)state;
1286 }
24ac23ab 1287 res = d_add_unique(dentry, igrab(state->inode));
02a913a7
TM		 1288 if (res != NULL)
1289 dentry = res;
1290 nfs4_intent_set_file(nd, dentry, state);
1291 return res;
1da177e4
LT		 1292}
1293
1294int
02a913a7 1295nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4
LT		 1296{
1297 struct rpc_cred *cred;
1298 struct nfs4_state *state;
1da177e4 1299
1f163415 1300 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1301 if (IS_ERR(cred))
1302 return PTR_ERR(cred);
1303 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1304 if (IS_ERR(state))
1305 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1306 put_rpccred(cred);
02a913a7
TM		 1307 if (IS_ERR(state)) {
1308 switch (PTR_ERR(state)) {
1309 case -EPERM:
1310 case -EACCES:
1311 case -EDQUOT:
1312 case -ENOSPC:
1313 case -EROFS:
1314 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1315 return 1;
b87c0adf
CL		 1316 default:
1317 goto out_drop;
02a913a7 1318 }
02a913a7 1319 }
24ac23ab 1320 if (state->inode == dentry->d_inode) {
02a913a7 1321 nfs4_intent_set_file(nd, dentry, state);
1da177e4
LT		 1322 return 1;
1323 }
1da177e4 1324 nfs4_close_state(state, openflags);
02a913a7
TM		 1325out_drop:
1326 d_drop(dentry);
1da177e4
LT		 1327 return 0;
1328}
1329
1330
1331static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1332{
1333 struct nfs4_server_caps_res res = {};
1334 struct rpc_message msg = {
1335 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1336 .rpc_argp = fhandle,
1337 .rpc_resp = &res,
1338 };
1339 int status;
1340
1341 status = rpc_call_sync(server->client, &msg, 0);
1342 if (status == 0) {
1343 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1344 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1345 server->caps |= NFS_CAP_ACLS;
1346 if (res.has_links != 0)
1347 server->caps |= NFS_CAP_HARDLINKS;
1348 if (res.has_symlinks != 0)
1349 server->caps |= NFS_CAP_SYMLINKS;
1350 server->acl_bitmask = res.acl_bitmask;
1351 }
1352 return status;
1353}
1354
55a97593 1355int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1356{
1357 struct nfs4_exception exception = { };
1358 int err;
1359 do {
1360 err = nfs4_handle_exception(server,
1361 _nfs4_server_capabilities(server, fhandle),
1362 &exception);
1363 } while (exception.retry);
1364 return err;
1365}
1366
1367static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1368 struct nfs_fsinfo *info)
1369{
1da177e4
LT		 1370 struct nfs4_lookup_root_arg args = {
1371 .bitmask = nfs4_fattr_bitmap,
1372 };
1373 struct nfs4_lookup_res res = {
1374 .server = server,
0e574af1 1375 .fattr = info->fattr,
1da177e4
LT		 1376 .fh = fhandle,
1377 };
1378 struct rpc_message msg = {
1379 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1380 .rpc_argp = &args,
1381 .rpc_resp = &res,
1382 };
0e574af1 1383 nfs_fattr_init(info->fattr);
1da177e4
LT		 1384 return rpc_call_sync(server->client, &msg, 0);
1385}
1386
1387static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1388 struct nfs_fsinfo *info)
1389{
1390 struct nfs4_exception exception = { };
1391 int err;
1392 do {
1393 err = nfs4_handle_exception(server,
1394 _nfs4_lookup_root(server, fhandle, info),
1395 &exception);
1396 } while (exception.retry);
1397 return err;
1398}
1399
54ceac45
DH		 1400/*
1401 * get the file handle for the "/" directory on the server
1402 */
1da177e4 1403static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1404 struct nfs_fsinfo *info)
1da177e4 1405{
1da177e4
LT		 1406 int status;
1407
1da177e4 1408 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1409 if (status == 0)
1410 status = nfs4_server_capabilities(server, fhandle);
1411 if (status == 0)
1412 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1413 return nfs4_map_errors(status);
1da177e4
LT		 1414}
1415
6b97fd3d
MN		 1416/*
1417 * Get locations and (maybe) other attributes of a referral.
1418 * Note that we'll actually follow the referral later when
1419 * we detect fsid mismatch in inode revalidation
1420 */
1421static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1422{
1423 int status = -ENOMEM;
1424 struct page *page = NULL;
1425 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1426
1427 page = alloc_page(GFP_KERNEL);
1428 if (page == NULL)
1429 goto out;
1430 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1431 if (locations == NULL)
1432 goto out;
1433
c228fd3a 1434 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1435 if (status != 0)
1436 goto out;
1437 /* Make sure server returned a different fsid for the referral */
1438 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1439 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1440 status = -EIO;
1441 goto out;
1442 }
1443
1444 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1445 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1446 if (!fattr->mode)
1447 fattr->mode = S_IFDIR;
1448 memset(fhandle, 0, sizeof(struct nfs_fh));
1449out:
1450 if (page)
1451 __free_page(page);
1452 if (locations)
1453 kfree(locations);
1454 return status;
1455}
1456
1da177e4
LT		 1457static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1458{
1459 struct nfs4_getattr_arg args = {
1460 .fh = fhandle,
1461 .bitmask = server->attr_bitmask,
1462 };
1463 struct nfs4_getattr_res res = {
1464 .fattr = fattr,
1465 .server = server,
1466 };
1467 struct rpc_message msg = {
1468 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1469 .rpc_argp = &args,
1470 .rpc_resp = &res,
1471 };
1472
0e574af1 1473 nfs_fattr_init(fattr);
1da177e4
LT		 1474 return rpc_call_sync(server->client, &msg, 0);
1475}
1476
1477static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1478{
1479 struct nfs4_exception exception = { };
1480 int err;
1481 do {
1482 err = nfs4_handle_exception(server,
1483 _nfs4_proc_getattr(server, fhandle, fattr),
1484 &exception);
1485 } while (exception.retry);
1486 return err;
1487}
1488
1489/*
1490 * The file is not closed if it is opened due to the a request to change
1491 * the size of the file. The open call will not be needed once the
1492 * VFS layer lookup-intents are implemented.
1493 *
1494 * Close is called when the inode is destroyed.
1495 * If we haven't opened the file for O_WRONLY, we
1496 * need to in the size_change case to obtain a stateid.
1497 *
1498 * Got race?
1499 * Because OPEN is always done by name in nfsv4, it is
1500 * possible that we opened a different file by the same
1501 * name. We can recognize this race condition, but we
1502 * can't do anything about it besides returning an error.
1503 *
1504 * This will be fixed with VFS changes (lookup-intent).
1505 */
1506static int
1507nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1508 struct iattr *sattr)
1509{
08e9eac4
TM		 1510 struct rpc_cred *cred;
1511 struct inode *inode = dentry->d_inode;
d530838b
TM		 1512 struct nfs_open_context *ctx;
1513 struct nfs4_state *state = NULL;
1da177e4
LT		 1514 int status;
1515
0e574af1 1516 nfs_fattr_init(fattr);
1da177e4 1517
1f163415 1518 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1519 if (IS_ERR(cred))
1520 return PTR_ERR(cred);
d530838b
TM		 1521
1522 /* Search for an existing open(O_WRITE) file */
1523 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1524 if (ctx != NULL)
1525 state = ctx->state;
08e9eac4 1526
3e4f6290 1527 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1528 if (status == 0)
1529 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1530 if (ctx != NULL)
1531 put_nfs_open_context(ctx);
08e9eac4 1532 put_rpccred(cred);
1da177e4
LT		 1533 return status;
1534}
1535
2b3de441
DH		 1536static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1537 struct qstr *name, struct nfs_fh *fhandle,
1538 struct nfs_fattr *fattr)
1539{
1540 int status;
1541 struct nfs4_lookup_arg args = {
1542 .bitmask = server->attr_bitmask,
1543 .dir_fh = dirfh,
1544 .name = name,
1545 };
1546 struct nfs4_lookup_res res = {
1547 .server = server,
1548 .fattr = fattr,
1549 .fh = fhandle,
1550 };
1551 struct rpc_message msg = {
1552 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1553 .rpc_argp = &args,
1554 .rpc_resp = &res,
1555 };
1556
1557 nfs_fattr_init(fattr);
1558
1559 dprintk("NFS call lookupfh %s\n", name->name);
1560 status = rpc_call_sync(server->client, &msg, 0);
1561 dprintk("NFS reply lookupfh: %d\n", status);
1562 if (status == -NFS4ERR_MOVED)
1563 status = -EREMOTE;
1564 return status;
1565}
1566
1567static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1568 struct qstr *name, struct nfs_fh *fhandle,
1569 struct nfs_fattr *fattr)
1570{
1571 struct nfs4_exception exception = { };
1572 int err;
1573 do {
1574 err = nfs4_handle_exception(server,
1575 _nfs4_proc_lookupfh(server, dirfh, name,
1576 fhandle, fattr),
1577 &exception);
1578 } while (exception.retry);
1579 return err;
1580}
1581
1da177e4
LT		 1582static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1583 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1584{
1585 int status;
1586 struct nfs_server *server = NFS_SERVER(dir);
1587 struct nfs4_lookup_arg args = {
1588 .bitmask = server->attr_bitmask,
1589 .dir_fh = NFS_FH(dir),
1590 .name = name,
1591 };
1592 struct nfs4_lookup_res res = {
1593 .server = server,
1594 .fattr = fattr,
1595 .fh = fhandle,
1596 };
1597 struct rpc_message msg = {
1598 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1599 .rpc_argp = &args,
1600 .rpc_resp = &res,
1601 };
1602
0e574af1 1603 nfs_fattr_init(fattr);
1da177e4
LT		 1604
1605 dprintk("NFS call lookup %s\n", name->name);
1606 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
6b97fd3d
MN		 1607 if (status == -NFS4ERR_MOVED)
1608 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1609 dprintk("NFS reply lookup: %d\n", status);
1610 return status;
1611}
1612
1613static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1614{
1615 struct nfs4_exception exception = { };
1616 int err;
1617 do {
1618 err = nfs4_handle_exception(NFS_SERVER(dir),
1619 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1620 &exception);
1621 } while (exception.retry);
1622 return err;
1623}
1624
1625static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1626{
1627 struct nfs4_accessargs args = {
1628 .fh = NFS_FH(inode),
1629 };
1630 struct nfs4_accessres res = { 0 };
1631 struct rpc_message msg = {
1632 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1633 .rpc_argp = &args,
1634 .rpc_resp = &res,
1635 .rpc_cred = entry->cred,
1636 };
1637 int mode = entry->mask;
1638 int status;
1639
1640 /*
1641 * Determine which access bits we want to ask for...
1642 */
1643 if (mode & MAY_READ)
1644 args.access |= NFS4_ACCESS_READ;
1645 if (S_ISDIR(inode->i_mode)) {
1646 if (mode & MAY_WRITE)
1647 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1648 if (mode & MAY_EXEC)
1649 args.access |= NFS4_ACCESS_LOOKUP;
1650 } else {
1651 if (mode & MAY_WRITE)
1652 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1653 if (mode & MAY_EXEC)
1654 args.access |= NFS4_ACCESS_EXECUTE;
1655 }
1656 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1657 if (!status) {
1658 entry->mask = 0;
1659 if (res.access & NFS4_ACCESS_READ)
1660 entry->mask |= MAY_READ;
1661 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1662 entry->mask |= MAY_WRITE;
1663 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1664 entry->mask |= MAY_EXEC;
1665 }
1666 return status;
1667}
1668
1669static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1670{
1671 struct nfs4_exception exception = { };
1672 int err;
1673 do {
1674 err = nfs4_handle_exception(NFS_SERVER(inode),
1675 _nfs4_proc_access(inode, entry),
1676 &exception);
1677 } while (exception.retry);
1678 return err;
1679}
1680
1681/*
1682 * TODO: For the time being, we don't try to get any attributes
1683 * along with any of the zero-copy operations READ, READDIR,
1684 * READLINK, WRITE.
1685 *
1686 * In the case of the first three, we want to put the GETATTR
1687 * after the read-type operation -- this is because it is hard
1688 * to predict the length of a GETATTR response in v4, and thus
1689 * align the READ data correctly. This means that the GETATTR
1690 * may end up partially falling into the page cache, and we should
1691 * shift it into the 'tail' of the xdr_buf before processing.
1692 * To do this efficiently, we need to know the total length
1693 * of data received, which doesn't seem to be available outside
1694 * of the RPC layer.
1695 *
1696 * In the case of WRITE, we also want to put the GETATTR after
1697 * the operation -- in this case because we want to make sure
1698 * we get the post-operation mtime and size. This means that
1699 * we can't use xdr_encode_pages() as written: we need a variant
1700 * of it which would leave room in the 'tail' iovec.
1701 *
1702 * Both of these changes to the XDR layer would in fact be quite
1703 * minor, but I decided to leave them for a subsequent patch.
1704 */
1705static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1706 unsigned int pgbase, unsigned int pglen)
1707{
1708 struct nfs4_readlink args = {
1709 .fh = NFS_FH(inode),
1710 .pgbase = pgbase,
1711 .pglen = pglen,
1712 .pages = &page,
1713 };
1714 struct rpc_message msg = {
1715 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1716 .rpc_argp = &args,
1717 .rpc_resp = NULL,
1718 };
1719
1720 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1721}
1722
1723static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1724 unsigned int pgbase, unsigned int pglen)
1725{
1726 struct nfs4_exception exception = { };
1727 int err;
1728 do {
1729 err = nfs4_handle_exception(NFS_SERVER(inode),
1730 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1731 &exception);
1732 } while (exception.retry);
1733 return err;
1734}
1735
1da177e4
LT		 1736/*
1737 * Got race?
1738 * We will need to arrange for the VFS layer to provide an atomic open.
1739 * Until then, this create/open method is prone to inefficiency and race
1740 * conditions due to the lookup, create, and open VFS calls from sys_open()
1741 * placed on the wire.
1742 *
1743 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1744 * The file will be opened again in the subsequent VFS open call
1745 * (nfs4_proc_file_open).
1746 *
1747 * The open for read will just hang around to be used by any process that
1748 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1749 */
1750
1751static int
1752nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1753 int flags, struct nameidata *nd)
1da177e4
LT		 1754{
1755 struct nfs4_state *state;
1756 struct rpc_cred *cred;
1757 int status = 0;
1758
1f163415 1759 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1760 if (IS_ERR(cred)) {
1761 status = PTR_ERR(cred);
1762 goto out;
1763 }
1764 state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1765 put_rpccred(cred);
1766 if (IS_ERR(state)) {
1767 status = PTR_ERR(state);
1768 goto out;
1769 }
24ac23ab 1770 d_instantiate(dentry, igrab(state->inode));
1da177e4
LT		 1771 if (flags & O_EXCL) {
1772 struct nfs_fattr fattr;
3e4f6290 1773 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1774 if (status == 0)
65e4308d 1775 nfs_setattr_update_inode(state->inode, sattr);
02a913a7
TM		 1776 }
1777 if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
95cf959b 1778 status = nfs4_intent_set_file(nd, dentry, state);
02a913a7
TM		 1779 else
1780 nfs4_close_state(state, flags);
1da177e4
LT		 1781out:
1782 return status;
1783}
1784
1785static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1786{
16e42959 1787 struct nfs_server *server = NFS_SERVER(dir);
1da177e4
LT		 1788 struct nfs4_remove_arg args = {
1789 .fh = NFS_FH(dir),
1790 .name = name,
16e42959
TM		 1791 .bitmask = server->attr_bitmask,
1792 };
1793 struct nfs_fattr dir_attr;
1794 struct nfs4_remove_res res = {
1795 .server = server,
1796 .dir_attr = &dir_attr,
1da177e4 1797 };
1da177e4
LT		 1798 struct rpc_message msg = {
1799 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1800 .rpc_argp = &args,
1801 .rpc_resp = &res,
1802 };
1803 int status;
1804
16e42959
TM		 1805 nfs_fattr_init(res.dir_attr);
1806 status = rpc_call_sync(server->client, &msg, 0);
1807 if (status == 0) {
1808 update_changeattr(dir, &res.cinfo);
1809 nfs_post_op_update_inode(dir, res.dir_attr);
1810 }
1da177e4
LT		 1811 return status;
1812}
1813
1814static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1815{
1816 struct nfs4_exception exception = { };
1817 int err;
1818 do {
1819 err = nfs4_handle_exception(NFS_SERVER(dir),
1820 _nfs4_proc_remove(dir, name),
1821 &exception);
1822 } while (exception.retry);
1823 return err;
1824}
1825
1826struct unlink_desc {
1827 struct nfs4_remove_arg args;
16e42959
TM		 1828 struct nfs4_remove_res res;
1829 struct nfs_fattr dir_attr;
1da177e4
LT		 1830};
1831
1832static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1833 struct qstr *name)
1834{
16e42959 1835 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1da177e4
LT		 1836 struct unlink_desc *up;
1837
5cbded58 1838 up = kmalloc(sizeof(*up), GFP_KERNEL);
1da177e4
LT		 1839 if (!up)
1840 return -ENOMEM;
1841
1842 up->args.fh = NFS_FH(dir->d_inode);
1843 up->args.name = name;
16e42959
TM		 1844 up->args.bitmask = server->attr_bitmask;
1845 up->res.server = server;
1846 up->res.dir_attr = &up->dir_attr;
1da177e4
LT		 1847
1848 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1849 msg->rpc_argp = &up->args;
1850 msg->rpc_resp = &up->res;
1851 return 0;
1852}
1853
1854static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1855{
1856 struct rpc_message *msg = &task->tk_msg;
1857 struct unlink_desc *up;
1858
1859 if (msg->rpc_resp != NULL) {
1860 up = container_of(msg->rpc_resp, struct unlink_desc, res);
16e42959
TM		 1861 update_changeattr(dir->d_inode, &up->res.cinfo);
1862 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1da177e4
LT		 1863 kfree(up);
1864 msg->rpc_resp = NULL;
1865 msg->rpc_argp = NULL;
1866 }
1867 return 0;
1868}
1869
1870static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1871 struct inode *new_dir, struct qstr *new_name)
1872{
6caf2c82 1873 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1874 struct nfs4_rename_arg arg = {
1875 .old_dir = NFS_FH(old_dir),
1876 .new_dir = NFS_FH(new_dir),
1877 .old_name = old_name,
1878 .new_name = new_name,
6caf2c82
TM		 1879 .bitmask = server->attr_bitmask,
1880 };
1881 struct nfs_fattr old_fattr, new_fattr;
1882 struct nfs4_rename_res res = {
1883 .server = server,
1884 .old_fattr = &old_fattr,
1885 .new_fattr = &new_fattr,
1da177e4 1886 };
1da177e4
LT		 1887 struct rpc_message msg = {
1888 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1889 .rpc_argp = &arg,
1890 .rpc_resp = &res,
1891 };
1892 int status;
1893
6caf2c82
TM		 1894 nfs_fattr_init(res.old_fattr);
1895 nfs_fattr_init(res.new_fattr);
1896 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 1897
1898 if (!status) {
1899 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 1900 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 1901 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 1902 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 1903 }
1904 return status;
1905}
1906
1907static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1908 struct inode *new_dir, struct qstr *new_name)
1909{
1910 struct nfs4_exception exception = { };
1911 int err;
1912 do {
1913 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1914 _nfs4_proc_rename(old_dir, old_name,
1915 new_dir, new_name),
1916 &exception);
1917 } while (exception.retry);
1918 return err;
1919}
1920
1921static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1922{
91ba2eee 1923 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1924 struct nfs4_link_arg arg = {
1925 .fh = NFS_FH(inode),
1926 .dir_fh = NFS_FH(dir),
1927 .name = name,
91ba2eee
TM		 1928 .bitmask = server->attr_bitmask,
1929 };
1930 struct nfs_fattr fattr, dir_attr;
1931 struct nfs4_link_res res = {
1932 .server = server,
1933 .fattr = &fattr,
1934 .dir_attr = &dir_attr,
1da177e4 1935 };
1da177e4
LT		 1936 struct rpc_message msg = {
1937 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1938 .rpc_argp = &arg,
91ba2eee 1939 .rpc_resp = &res,
1da177e4
LT		 1940 };
1941 int status;
1942
91ba2eee
TM		 1943 nfs_fattr_init(res.fattr);
1944 nfs_fattr_init(res.dir_attr);
1945 status = rpc_call_sync(server->client, &msg, 0);
1946 if (!status) {
1947 update_changeattr(dir, &res.cinfo);
1948 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 1949 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 1950 }
1da177e4
LT		 1951
1952 return status;
1953}
1954
1955static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1956{
1957 struct nfs4_exception exception = { };
1958 int err;
1959 do {
1960 err = nfs4_handle_exception(NFS_SERVER(inode),
1961 _nfs4_proc_link(inode, dir, name),
1962 &exception);
1963 } while (exception.retry);
1964 return err;
1965}
1966
4f390c15 1967static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 1968 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 1969{
1970 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 1971 struct nfs_fh fhandle;
1972 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 1973 struct nfs4_create_arg arg = {
1974 .dir_fh = NFS_FH(dir),
1975 .server = server,
4f390c15 1976 .name = &dentry->d_name,
1da177e4
LT		 1977 .attrs = sattr,
1978 .ftype = NF4LNK,
1979 .bitmask = server->attr_bitmask,
1980 };
1981 struct nfs4_create_res res = {
1982 .server = server,
4f390c15
CL		 1983 .fh = &fhandle,
1984 .fattr = &fattr,
56ae19f3 1985 .dir_fattr = &dir_fattr,
1da177e4
LT		 1986 };
1987 struct rpc_message msg = {
1988 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1989 .rpc_argp = &arg,
1990 .rpc_resp = &res,
1991 };
1992 int status;
1993
94a6d753 1994 if (len > NFS4_MAXPATHLEN)
1da177e4 1995 return -ENAMETOOLONG;
4f390c15 1996
94a6d753
CL		 1997 arg.u.symlink.pages = &page;
1998 arg.u.symlink.len = len;
4f390c15 1999 nfs_fattr_init(&fattr);
56ae19f3 2000 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2001
2002 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2003 if (!status) {
1da177e4 2004 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2005 nfs_post_op_update_inode(dir, res.dir_fattr);
2006 status = nfs_instantiate(dentry, &fhandle, &fattr);
2007 }
1da177e4
LT		 2008 return status;
2009}
2010
4f390c15 2011static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2012 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2013{
2014 struct nfs4_exception exception = { };
2015 int err;
2016 do {
2017 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2018 _nfs4_proc_symlink(dir, dentry, page,
2019 len, sattr),
1da177e4
LT		 2020 &exception);
2021 } while (exception.retry);
2022 return err;
2023}
2024
2025static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2026 struct iattr *sattr)
2027{
2028 struct nfs_server *server = NFS_SERVER(dir);
2029 struct nfs_fh fhandle;
56ae19f3 2030 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2031 struct nfs4_create_arg arg = {
2032 .dir_fh = NFS_FH(dir),
2033 .server = server,
2034 .name = &dentry->d_name,
2035 .attrs = sattr,
2036 .ftype = NF4DIR,
2037 .bitmask = server->attr_bitmask,
2038 };
2039 struct nfs4_create_res res = {
2040 .server = server,
2041 .fh = &fhandle,
2042 .fattr = &fattr,
56ae19f3 2043 .dir_fattr = &dir_fattr,
1da177e4
LT		 2044 };
2045 struct rpc_message msg = {
2046 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2047 .rpc_argp = &arg,
2048 .rpc_resp = &res,
2049 };
2050 int status;
2051
0e574af1 2052 nfs_fattr_init(&fattr);
56ae19f3 2053 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2054
2055 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2056 if (!status) {
2057 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2058 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2059 status = nfs_instantiate(dentry, &fhandle, &fattr);
2060 }
2061 return status;
2062}
2063
2064static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2065 struct iattr *sattr)
2066{
2067 struct nfs4_exception exception = { };
2068 int err;
2069 do {
2070 err = nfs4_handle_exception(NFS_SERVER(dir),
2071 _nfs4_proc_mkdir(dir, dentry, sattr),
2072 &exception);
2073 } while (exception.retry);
2074 return err;
2075}
2076
2077static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2078 u64 cookie, struct page *page, unsigned int count, int plus)
2079{
2080 struct inode *dir = dentry->d_inode;
2081 struct nfs4_readdir_arg args = {
2082 .fh = NFS_FH(dir),
2083 .pages = &page,
2084 .pgbase = 0,
2085 .count = count,
2086 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2087 };
2088 struct nfs4_readdir_res res;
2089 struct rpc_message msg = {
2090 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2091 .rpc_argp = &args,
2092 .rpc_resp = &res,
2093 .rpc_cred = cred,
2094 };
2095 int status;
2096
eadf4598
TM		 2097 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2098 dentry->d_parent->d_name.name,
2099 dentry->d_name.name,
2100 (unsigned long long)cookie);
1da177e4
LT		 2101 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2102 res.pgbase = args.pgbase;
2103 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2104 if (status == 0)
2105 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
eadf4598 2106 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2107 return status;
2108}
2109
2110static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2111 u64 cookie, struct page *page, unsigned int count, int plus)
2112{
2113 struct nfs4_exception exception = { };
2114 int err;
2115 do {
2116 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2117 _nfs4_proc_readdir(dentry, cred, cookie,
2118 page, count, plus),
2119 &exception);
2120 } while (exception.retry);
2121 return err;
2122}
2123
2124static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2125 struct iattr *sattr, dev_t rdev)
2126{
2127 struct nfs_server *server = NFS_SERVER(dir);
2128 struct nfs_fh fh;
56ae19f3 2129 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2130 struct nfs4_create_arg arg = {
2131 .dir_fh = NFS_FH(dir),
2132 .server = server,
2133 .name = &dentry->d_name,
2134 .attrs = sattr,
2135 .bitmask = server->attr_bitmask,
2136 };
2137 struct nfs4_create_res res = {
2138 .server = server,
2139 .fh = &fh,
2140 .fattr = &fattr,
56ae19f3 2141 .dir_fattr = &dir_fattr,
1da177e4
LT		 2142 };
2143 struct rpc_message msg = {
2144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2145 .rpc_argp = &arg,
2146 .rpc_resp = &res,
2147 };
2148 int status;
2149 int mode = sattr->ia_mode;
2150
0e574af1 2151 nfs_fattr_init(&fattr);
56ae19f3 2152 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2153
2154 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2155 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2156 if (S_ISFIFO(mode))
2157 arg.ftype = NF4FIFO;
2158 else if (S_ISBLK(mode)) {
2159 arg.ftype = NF4BLK;
2160 arg.u.device.specdata1 = MAJOR(rdev);
2161 arg.u.device.specdata2 = MINOR(rdev);
2162 }
2163 else if (S_ISCHR(mode)) {
2164 arg.ftype = NF4CHR;
2165 arg.u.device.specdata1 = MAJOR(rdev);
2166 arg.u.device.specdata2 = MINOR(rdev);
2167 }
2168 else
2169 arg.ftype = NF4SOCK;
2170
2171 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2172 if (status == 0) {
2173 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2174 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2175 status = nfs_instantiate(dentry, &fh, &fattr);
2176 }
2177 return status;
2178}
2179
2180static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2181 struct iattr *sattr, dev_t rdev)
2182{
2183 struct nfs4_exception exception = { };
2184 int err;
2185 do {
2186 err = nfs4_handle_exception(NFS_SERVER(dir),
2187 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2188 &exception);
2189 } while (exception.retry);
2190 return err;
2191}
2192
2193static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2194 struct nfs_fsstat *fsstat)
2195{
2196 struct nfs4_statfs_arg args = {
2197 .fh = fhandle,
2198 .bitmask = server->attr_bitmask,
2199 };
2200 struct rpc_message msg = {
2201 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2202 .rpc_argp = &args,
2203 .rpc_resp = fsstat,
2204 };
2205
0e574af1 2206 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2207 return rpc_call_sync(server->client, &msg, 0);
2208}
2209
2210static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2211{
2212 struct nfs4_exception exception = { };
2213 int err;
2214 do {
2215 err = nfs4_handle_exception(server,
2216 _nfs4_proc_statfs(server, fhandle, fsstat),
2217 &exception);
2218 } while (exception.retry);
2219 return err;
2220}
2221
2222static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2223 struct nfs_fsinfo *fsinfo)
2224{
2225 struct nfs4_fsinfo_arg args = {
2226 .fh = fhandle,
2227 .bitmask = server->attr_bitmask,
2228 };
2229 struct rpc_message msg = {
2230 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2231 .rpc_argp = &args,
2232 .rpc_resp = fsinfo,
2233 };
2234
2235 return rpc_call_sync(server->client, &msg, 0);
2236}
2237
2238static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2239{
2240 struct nfs4_exception exception = { };
2241 int err;
2242
2243 do {
2244 err = nfs4_handle_exception(server,
2245 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2246 &exception);
2247 } while (exception.retry);
2248 return err;
2249}
2250
2251static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2252{
0e574af1 2253 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2254 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2255}
2256
2257static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2258 struct nfs_pathconf *pathconf)
2259{
2260 struct nfs4_pathconf_arg args = {
2261 .fh = fhandle,
2262 .bitmask = server->attr_bitmask,
2263 };
2264 struct rpc_message msg = {
2265 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2266 .rpc_argp = &args,
2267 .rpc_resp = pathconf,
2268 };
2269
2270 /* None of the pathconf attributes are mandatory to implement */
2271 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2272 memset(pathconf, 0, sizeof(*pathconf));
2273 return 0;
2274 }
2275
0e574af1 2276 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2277 return rpc_call_sync(server->client, &msg, 0);
2278}
2279
2280static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2281 struct nfs_pathconf *pathconf)
2282{
2283 struct nfs4_exception exception = { };
2284 int err;
2285
2286 do {
2287 err = nfs4_handle_exception(server,
2288 _nfs4_proc_pathconf(server, fhandle, pathconf),
2289 &exception);
2290 } while (exception.retry);
2291 return err;
2292}
2293
ec06c096 2294static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2295{
ec06c096 2296 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2297
ec06c096 2298 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2299 rpc_restart_call(task);
ec06c096 2300 return -EAGAIN;
1da177e4
LT		 2301 }
2302 if (task->tk_status > 0)
ec06c096
TM		 2303 renew_lease(server, data->timestamp);
2304 return 0;
1da177e4
LT		 2305}
2306
ec06c096 2307static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2308{
1da177e4
LT		 2309 struct rpc_message msg = {
2310 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2311 .rpc_argp = &data->args,
2312 .rpc_resp = &data->res,
2313 .rpc_cred = data->cred,
2314 };
1da177e4
LT		 2315
2316 data->timestamp = jiffies;
2317
ec06c096 2318 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2319}
2320
788e7a89 2321static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2322{
1da177e4
LT		 2323 struct inode *inode = data->inode;
2324
2325 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2326 rpc_restart_call(task);
788e7a89 2327 return -EAGAIN;
1da177e4 2328 }
4f9838c7 2329 if (task->tk_status >= 0) {
1da177e4 2330 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2331 nfs_post_op_update_inode(inode, data->res.fattr);
2332 }
788e7a89 2333 return 0;
1da177e4
LT		 2334}
2335
788e7a89 2336static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2337{
1da177e4
LT		 2338 struct rpc_message msg = {
2339 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2340 .rpc_argp = &data->args,
2341 .rpc_resp = &data->res,
2342 .rpc_cred = data->cred,
2343 };
2344 struct inode *inode = data->inode;
4f9838c7 2345 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2346 int stable;
1da177e4
LT		 2347
2348 if (how & FLUSH_STABLE) {
2349 if (!NFS_I(inode)->ncommit)
2350 stable = NFS_FILE_SYNC;
2351 else
2352 stable = NFS_DATA_SYNC;
2353 } else
2354 stable = NFS_UNSTABLE;
2355 data->args.stable = stable;
4f9838c7
TM		 2356 data->args.bitmask = server->attr_bitmask;
2357 data->res.server = server;
1da177e4
LT		 2358
2359 data->timestamp = jiffies;
2360
1da177e4 2361 /* Finalize the task. */
788e7a89 2362 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2363}
2364
788e7a89 2365static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2366{
1da177e4
LT		 2367 struct inode *inode = data->inode;
2368
2369 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2370 rpc_restart_call(task);
788e7a89 2371 return -EAGAIN;
1da177e4 2372 }
4f9838c7
TM		 2373 if (task->tk_status >= 0)
2374 nfs_post_op_update_inode(inode, data->res.fattr);
788e7a89 2375 return 0;
1da177e4
LT		 2376}
2377
788e7a89 2378static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2379{
1da177e4
LT		 2380 struct rpc_message msg = {
2381 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2382 .rpc_argp = &data->args,
2383 .rpc_resp = &data->res,
2384 .rpc_cred = data->cred,
2385 };
788e7a89 2386 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2387
4f9838c7
TM		 2388 data->args.bitmask = server->attr_bitmask;
2389 data->res.server = server;
2390
788e7a89 2391 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2392}
2393
2394/*
2395 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2396 * standalone procedure for queueing an asynchronous RENEW.
2397 */
963d8fe5 2398static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2399{
adfa6f98 2400 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2401 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2402
2403 if (task->tk_status < 0) {
2404 switch (task->tk_status) {
2405 case -NFS4ERR_STALE_CLIENTID:
2406 case -NFS4ERR_EXPIRED:
2407 case -NFS4ERR_CB_PATH_DOWN:
2408 nfs4_schedule_state_recovery(clp);
2409 }
2410 return;
2411 }
2412 spin_lock(&clp->cl_lock);
2413 if (time_before(clp->cl_last_renewal,timestamp))
2414 clp->cl_last_renewal = timestamp;
2415 spin_unlock(&clp->cl_lock);
2416}
2417
963d8fe5
TM		 2418static const struct rpc_call_ops nfs4_renew_ops = {
2419 .rpc_call_done = nfs4_renew_done,
2420};
2421
adfa6f98 2422int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2423{
2424 struct rpc_message msg = {
2425 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2426 .rpc_argp = clp,
b4454fe1 2427 .rpc_cred = cred,
1da177e4
LT		 2428 };
2429
2430 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2431 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2432}
2433
adfa6f98 2434int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2435{
2436 struct rpc_message msg = {
2437 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2438 .rpc_argp = clp,
b4454fe1 2439 .rpc_cred = cred,
1da177e4
LT		 2440 };
2441 unsigned long now = jiffies;
2442 int status;
2443
2444 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2445 if (status < 0)
2446 return status;
2447 spin_lock(&clp->cl_lock);
2448 if (time_before(clp->cl_last_renewal,now))
2449 clp->cl_last_renewal = now;
2450 spin_unlock(&clp->cl_lock);
2451 return 0;
2452}
2453
aa1870af
BF		 2454static inline int nfs4_server_supports_acls(struct nfs_server *server)
2455{
2456 return (server->caps & NFS_CAP_ACLS)
2457 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2458 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2459}
2460
2461/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2462 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2463 * the stack.
2464 */
2465#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2466
2467static void buf_to_pages(const void *buf, size_t buflen,
2468 struct page **pages, unsigned int *pgbase)
2469{
2470 const void *p = buf;
2471
2472 *pgbase = offset_in_page(buf);
2473 p -= *pgbase;
2474 while (p < buf + buflen) {
2475 *(pages++) = virt_to_page(p);
2476 p += PAGE_CACHE_SIZE;
2477 }
2478}
2479
e50a1c2e
BF		 2480struct nfs4_cached_acl {
2481 int cached;
2482 size_t len;
3e9d4154 2483 char data[0];
e50a1c2e
BF		 2484};
2485
2486static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2487{
2488 struct nfs_inode *nfsi = NFS_I(inode);
2489
2490 spin_lock(&inode->i_lock);
2491 kfree(nfsi->nfs4_acl);
2492 nfsi->nfs4_acl = acl;
2493 spin_unlock(&inode->i_lock);
2494}
2495
2496static void nfs4_zap_acl_attr(struct inode *inode)
2497{
2498 nfs4_set_cached_acl(inode, NULL);
2499}
2500
2501static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2502{
2503 struct nfs_inode *nfsi = NFS_I(inode);
2504 struct nfs4_cached_acl *acl;
2505 int ret = -ENOENT;
2506
2507 spin_lock(&inode->i_lock);
2508 acl = nfsi->nfs4_acl;
2509 if (acl == NULL)
2510 goto out;
2511 if (buf == NULL) /* user is just asking for length */
2512 goto out_len;
2513 if (acl->cached == 0)
2514 goto out;
2515 ret = -ERANGE; /* see getxattr(2) man page */
2516 if (acl->len > buflen)
2517 goto out;
2518 memcpy(buf, acl->data, acl->len);
2519out_len:
2520 ret = acl->len;
2521out:
2522 spin_unlock(&inode->i_lock);
2523 return ret;
2524}
2525
2526static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2527{
2528 struct nfs4_cached_acl *acl;
2529
2530 if (buf && acl_len <= PAGE_SIZE) {
2531 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2532 if (acl == NULL)
2533 goto out;
2534 acl->cached = 1;
2535 memcpy(acl->data, buf, acl_len);
2536 } else {
2537 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2538 if (acl == NULL)
2539 goto out;
2540 acl->cached = 0;
2541 }
2542 acl->len = acl_len;
2543out:
2544 nfs4_set_cached_acl(inode, acl);
2545}
2546
16b4289c 2547static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2548{
aa1870af
BF		 2549 struct page *pages[NFS4ACL_MAXPAGES];
2550 struct nfs_getaclargs args = {
2551 .fh = NFS_FH(inode),
2552 .acl_pages = pages,
2553 .acl_len = buflen,
2554 };
2555 size_t resp_len = buflen;
e50a1c2e 2556 void *resp_buf;
aa1870af
BF		 2557 struct rpc_message msg = {
2558 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2559 .rpc_argp = &args,
2560 .rpc_resp = &resp_len,
2561 };
e50a1c2e 2562 struct page *localpage = NULL;
aa1870af
BF		 2563 int ret;
2564
e50a1c2e
BF		 2565 if (buflen < PAGE_SIZE) {
2566 /* As long as we're doing a round trip to the server anyway,
2567 * let's be prepared for a page of acl data. */
2568 localpage = alloc_page(GFP_KERNEL);
2569 resp_buf = page_address(localpage);
2570 if (localpage == NULL)
2571 return -ENOMEM;
2572 args.acl_pages[0] = localpage;
2573 args.acl_pgbase = 0;
1d95db8e 2574 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2575 } else {
2576 resp_buf = buf;
2577 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2578 }
aa1870af 2579 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2580 if (ret)
2581 goto out_free;
2582 if (resp_len > args.acl_len)
2583 nfs4_write_cached_acl(inode, NULL, resp_len);
2584 else
2585 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2586 if (buf) {
2587 ret = -ERANGE;
2588 if (resp_len > buflen)
2589 goto out_free;
2590 if (localpage)
2591 memcpy(buf, resp_buf, resp_len);
2592 }
2593 ret = resp_len;
2594out_free:
2595 if (localpage)
2596 __free_page(localpage);
aa1870af
BF		 2597 return ret;
2598}
2599
16b4289c
TM		 2600static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2601{
2602 struct nfs4_exception exception = { };
2603 ssize_t ret;
2604 do {
2605 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2606 if (ret >= 0)
2607 break;
2608 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2609 } while (exception.retry);
2610 return ret;
2611}
2612
e50a1c2e
BF		 2613static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2614{
2615 struct nfs_server *server = NFS_SERVER(inode);
2616 int ret;
2617
2618 if (!nfs4_server_supports_acls(server))
2619 return -EOPNOTSUPP;
2620 ret = nfs_revalidate_inode(server, inode);
2621 if (ret < 0)
2622 return ret;
2623 ret = nfs4_read_cached_acl(inode, buf, buflen);
2624 if (ret != -ENOENT)
2625 return ret;
2626 return nfs4_get_acl_uncached(inode, buf, buflen);
2627}
2628
16b4289c 2629static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2630{
2631 struct nfs_server *server = NFS_SERVER(inode);
2632 struct page *pages[NFS4ACL_MAXPAGES];
2633 struct nfs_setaclargs arg = {
2634 .fh = NFS_FH(inode),
2635 .acl_pages = pages,
2636 .acl_len = buflen,
2637 };
2638 struct rpc_message msg = {
2639 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2640 .rpc_argp = &arg,
2641 .rpc_resp = NULL,
2642 };
2643 int ret;
2644
2645 if (!nfs4_server_supports_acls(server))
2646 return -EOPNOTSUPP;
642ac549 2647 nfs_inode_return_delegation(inode);
4b580ee3 2648 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2649 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2650 if (ret == 0)
2651 nfs4_write_cached_acl(inode, buf, buflen);
4b580ee3
BF		 2652 return ret;
2653}
2654
16b4289c
TM		 2655static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2656{
2657 struct nfs4_exception exception = { };
2658 int err;
2659 do {
2660 err = nfs4_handle_exception(NFS_SERVER(inode),
2661 __nfs4_proc_set_acl(inode, buf, buflen),
2662 &exception);
2663 } while (exception.retry);
2664 return err;
2665}
2666
1da177e4 2667static int
faf5f49c 2668nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2669{
7539bbab 2670 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2671
2672 if (!clp || task->tk_status >= 0)
2673 return 0;
2674 switch(task->tk_status) {
2675 case -NFS4ERR_STALE_CLIENTID:
2676 case -NFS4ERR_STALE_STATEID:
2677 case -NFS4ERR_EXPIRED:
2678 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2679 nfs4_schedule_state_recovery(clp);
433fbe4c 2680 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2681 rpc_wake_up_task(task);
2682 task->tk_status = 0;
2683 return -EAGAIN;
1da177e4 2684 case -NFS4ERR_DELAY:
006ea73e
CL		 2685 nfs_inc_server_stats((struct nfs_server *) server,
2686 NFSIOS_DELAY);
2687 case -NFS4ERR_GRACE:
1da177e4
LT		 2688 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2689 task->tk_status = 0;
2690 return -EAGAIN;
2691 case -NFS4ERR_OLD_STATEID:
2692 task->tk_status = 0;
2693 return -EAGAIN;
2694 }
2695 task->tk_status = nfs4_map_errors(task->tk_status);
2696 return 0;
2697}
2698
433fbe4c
TM		 2699static int nfs4_wait_bit_interruptible(void *word)
2700{
2701 if (signal_pending(current))
2702 return -ERESTARTSYS;
2703 schedule();
2704 return 0;
2705}
2706
adfa6f98 2707static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2708{
1da177e4 2709 sigset_t oldset;
433fbe4c 2710 int res;
1da177e4
LT		 2711
2712 might_sleep();
2713
e148582e
TM		 2714 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2715
1da177e4 2716 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2717 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2718 nfs4_wait_bit_interruptible,
2719 TASK_INTERRUPTIBLE);
1da177e4 2720 rpc_clnt_sigunmask(clnt, &oldset);
e148582e
TM		 2721
2722 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2723 return res;
2724}
2725
2726static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2727{
2728 sigset_t oldset;
2729 int res = 0;
2730
2731 might_sleep();
2732
2733 if (*timeout <= 0)
2734 *timeout = NFS4_POLL_RETRY_MIN;
2735 if (*timeout > NFS4_POLL_RETRY_MAX)
2736 *timeout = NFS4_POLL_RETRY_MAX;
2737 rpc_clnt_sigmask(clnt, &oldset);
2738 if (clnt->cl_intr) {
041e0e3b 2739 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2740 if (signalled())
2741 res = -ERESTARTSYS;
041e0e3b
NA		 2742 } else
2743 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2744 rpc_clnt_sigunmask(clnt, &oldset);
2745 *timeout <<= 1;
2746 return res;
2747}
2748
2749/* This is the error handling routine for processes that are allowed
2750 * to sleep.
2751 */
faf5f49c 2752int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2753{
7539bbab 2754 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2755 int ret = errorcode;
2756
2757 exception->retry = 0;
2758 switch(errorcode) {
2759 case 0:
2760 return 0;
2761 case -NFS4ERR_STALE_CLIENTID:
2762 case -NFS4ERR_STALE_STATEID:
2763 case -NFS4ERR_EXPIRED:
433fbe4c 2764 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2765 ret = nfs4_wait_clnt_recover(server->client, clp);
2766 if (ret == 0)
2767 exception->retry = 1;
2768 break;
c514983d 2769 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2770 case -NFS4ERR_GRACE:
2771 case -NFS4ERR_DELAY:
2772 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2773 if (ret != 0)
2774 break;
1da177e4 2775 case -NFS4ERR_OLD_STATEID:
2c56617d 2776 exception->retry = 1;
1da177e4
LT		 2777 }
2778 /* We failed to handle the error */
2779 return nfs4_map_errors(ret);
2780}
2781
adfa6f98 2782int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2783{
2784 nfs4_verifier sc_verifier;
2785 struct nfs4_setclientid setclientid = {
2786 .sc_verifier = &sc_verifier,
2787 .sc_prog = program,
2788 };
2789 struct rpc_message msg = {
2790 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2791 .rpc_argp = &setclientid,
2792 .rpc_resp = clp,
286d7d6a 2793 .rpc_cred = cred,
1da177e4 2794 };
bc4785cd 2795 __be32 *p;
1da177e4
LT		 2796 int loop = 0;
2797 int status;
2798
bc4785cd 2799 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2800 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2801 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2802
2803 for(;;) {
2804 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2805 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2806 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2807 cred->cr_ops->cr_name,
1da177e4
LT		 2808 clp->cl_id_uniquifier);
2809 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2810 sizeof(setclientid.sc_netid), "tcp");
2811 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2812 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2813 clp->cl_ipaddr, port >> 8, port & 255);
2814
2815 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2816 if (status != -NFS4ERR_CLID_INUSE)
2817 break;
2818 if (signalled())
2819 break;
2820 if (loop++ & 1)
2821 ssleep(clp->cl_lease_time + 1);
2822 else
2823 if (++clp->cl_id_uniquifier == 0)
2824 break;
2825 }
2826 return status;
2827}
2828
adfa6f98 2829static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2830{
2831 struct nfs_fsinfo fsinfo;
2832 struct rpc_message msg = {
2833 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2834 .rpc_argp = clp,
2835 .rpc_resp = &fsinfo,
286d7d6a 2836 .rpc_cred = cred,
1da177e4
LT		 2837 };
2838 unsigned long now;
2839 int status;
2840
2841 now = jiffies;
2842 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2843 if (status == 0) {
2844 spin_lock(&clp->cl_lock);
2845 clp->cl_lease_time = fsinfo.lease_time * HZ;
2846 clp->cl_last_renewal = now;
58d9714a 2847 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2848 spin_unlock(&clp->cl_lock);
2849 }
2850 return status;
2851}
2852
adfa6f98 2853int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2854{
2855 long timeout;
2856 int err;
2857 do {
2858 err = _nfs4_proc_setclientid_confirm(clp, cred);
2859 switch (err) {
2860 case 0:
2861 return err;
2862 case -NFS4ERR_RESOURCE:
2863 /* The IBM lawyers misread another document! */
2864 case -NFS4ERR_DELAY:
2865 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2866 }
2867 } while (err == 0);
2868 return err;
2869}
2870
fe650407
TM		 2871struct nfs4_delegreturndata {
2872 struct nfs4_delegreturnargs args;
fa178f29 2873 struct nfs4_delegreturnres res;
fe650407
TM		 2874 struct nfs_fh fh;
2875 nfs4_stateid stateid;
2876 struct rpc_cred *cred;
26e976a8 2877 unsigned long timestamp;
fa178f29 2878 struct nfs_fattr fattr;
fe650407
TM		 2879 int rpc_status;
2880};
2881
2882static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 2883{
fe650407 2884 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 2885 struct rpc_message msg = {
2886 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 2887 .rpc_argp = &data->args,
fa178f29 2888 .rpc_resp = &data->res,
fe650407 2889 .rpc_cred = data->cred,
1da177e4 2890 };
fa178f29 2891 nfs_fattr_init(data->res.fattr);
fe650407
TM		 2892 rpc_call_setup(task, &msg, 0);
2893}
1da177e4 2894
fe650407
TM		 2895static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2896{
2897 struct nfs4_delegreturndata *data = calldata;
2898 data->rpc_status = task->tk_status;
26e976a8 2899 if (data->rpc_status == 0)
fa178f29 2900 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2901}
2902
2903static void nfs4_delegreturn_release(void *calldata)
2904{
2905 struct nfs4_delegreturndata *data = calldata;
2906
2907 put_rpccred(data->cred);
2908 kfree(calldata);
2909}
2910
c8d149f3 2911static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 2912 .rpc_call_prepare = nfs4_delegreturn_prepare,
2913 .rpc_call_done = nfs4_delegreturn_done,
2914 .rpc_release = nfs4_delegreturn_release,
2915};
2916
2917static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2918{
2919 struct nfs4_delegreturndata *data;
fa178f29 2920 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 2921 struct rpc_task *task;
2922 int status;
2923
2924 data = kmalloc(sizeof(*data), GFP_KERNEL);
2925 if (data == NULL)
2926 return -ENOMEM;
2927 data->args.fhandle = &data->fh;
2928 data->args.stateid = &data->stateid;
fa178f29 2929 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 2930 nfs_copy_fh(&data->fh, NFS_FH(inode));
2931 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 2932 data->res.fattr = &data->fattr;
2933 data->res.server = server;
fe650407 2934 data->cred = get_rpccred(cred);
26e976a8 2935 data->timestamp = jiffies;
fe650407
TM		 2936 data->rpc_status = 0;
2937
2938 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 2939 if (IS_ERR(task))
fe650407 2940 return PTR_ERR(task);
fe650407 2941 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 2942 if (status == 0) {
fe650407 2943 status = data->rpc_status;
fa178f29
TM		 2944 if (status == 0)
2945 nfs_post_op_update_inode(inode, &data->fattr);
2946 }
e6b3c4db 2947 rpc_put_task(task);
fe650407 2948 return status;
1da177e4
LT		 2949}
2950
2951int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2952{
2953 struct nfs_server *server = NFS_SERVER(inode);
2954 struct nfs4_exception exception = { };
2955 int err;
2956 do {
2957 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2958 switch (err) {
2959 case -NFS4ERR_STALE_STATEID:
2960 case -NFS4ERR_EXPIRED:
1da177e4
LT		 2961 case 0:
2962 return 0;
2963 }
2964 err = nfs4_handle_exception(server, err, &exception);
2965 } while (exception.retry);
2966 return err;
2967}
2968
2969#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2970#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2971
2972/*
2973 * sleep, with exponential backoff, and retry the LOCK operation.
2974 */
2975static unsigned long
2976nfs4_set_lock_task_retry(unsigned long timeout)
2977{
041e0e3b 2978 schedule_timeout_interruptible(timeout);
1da177e4
LT		 2979 timeout <<= 1;
2980 if (timeout > NFS4_LOCK_MAXTIMEOUT)
2981 return NFS4_LOCK_MAXTIMEOUT;
2982 return timeout;
2983}
2984
1da177e4
LT		 2985static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2986{
2987 struct inode *inode = state->inode;
2988 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 2989 struct nfs_client *clp = server->nfs_client;
911d1aaf 2990 struct nfs_lockt_args arg = {
1da177e4 2991 .fh = NFS_FH(inode),
911d1aaf 2992 .fl = request,
1da177e4 2993 };
911d1aaf
TM		 2994 struct nfs_lockt_res res = {
2995 .denied = request,
1da177e4
LT		 2996 };
2997 struct rpc_message msg = {
2998 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2999 .rpc_argp = &arg,
3000 .rpc_resp = &res,
3001 .rpc_cred = state->owner->so_cred,
3002 };
1da177e4
LT		 3003 struct nfs4_lock_state *lsp;
3004 int status;
3005
3006 down_read(&clp->cl_sem);
911d1aaf 3007 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3008 status = nfs4_set_lock_state(state, request);
3009 if (status != 0)
3010 goto out;
3011 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3012 arg.lock_owner.id = lsp->ls_id;
1da177e4 3013 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3014 switch (status) {
3015 case 0:
3016 request->fl_type = F_UNLCK;
3017 break;
3018 case -NFS4ERR_DENIED:
3019 status = 0;
1da177e4 3020 }
8d0a8a9d 3021out:
1da177e4
LT		 3022 up_read(&clp->cl_sem);
3023 return status;
3024}
3025
3026static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3027{
3028 struct nfs4_exception exception = { };
3029 int err;
3030
3031 do {
3032 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3033 _nfs4_proc_getlk(state, cmd, request),
3034 &exception);
3035 } while (exception.retry);
3036 return err;
3037}
3038
3039static int do_vfs_lock(struct file *file, struct file_lock *fl)
3040{
3041 int res = 0;
3042 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3043 case FL_POSIX:
3044 res = posix_lock_file_wait(file, fl);
3045 break;
3046 case FL_FLOCK:
3047 res = flock_lock_file_wait(file, fl);
3048 break;
3049 default:
3050 BUG();
3051 }
1da177e4
LT		 3052 return res;
3053}
3054
faf5f49c 3055struct nfs4_unlockdata {
911d1aaf
TM		 3056 struct nfs_locku_args arg;
3057 struct nfs_locku_res res;
faf5f49c
TM		 3058 struct nfs4_lock_state *lsp;
3059 struct nfs_open_context *ctx;
911d1aaf
TM		 3060 struct file_lock fl;
3061 const struct nfs_server *server;
26e976a8 3062 unsigned long timestamp;
faf5f49c
TM		 3063};
3064
911d1aaf
TM		 3065static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3066 struct nfs_open_context *ctx,
3067 struct nfs4_lock_state *lsp,
3068 struct nfs_seqid *seqid)
3069{
3070 struct nfs4_unlockdata *p;
3071 struct inode *inode = lsp->ls_state->inode;
3072
3073 p = kmalloc(sizeof(*p), GFP_KERNEL);
3074 if (p == NULL)
3075 return NULL;
3076 p->arg.fh = NFS_FH(inode);
3077 p->arg.fl = &p->fl;
3078 p->arg.seqid = seqid;
3079 p->arg.stateid = &lsp->ls_stateid;
3080 p->lsp = lsp;
3081 atomic_inc(&lsp->ls_count);
3082 /* Ensure we don't close file until we're done freeing locks! */
3083 p->ctx = get_nfs_open_context(ctx);
3084 memcpy(&p->fl, fl, sizeof(p->fl));
3085 p->server = NFS_SERVER(inode);
3086 return p;
3087}
3088
06f814a3 3089static void nfs4_locku_release_calldata(void *data)
faf5f49c 3090{
963d8fe5 3091 struct nfs4_unlockdata *calldata = data;
911d1aaf 3092 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3093 nfs4_put_lock_state(calldata->lsp);
3094 put_nfs_open_context(calldata->ctx);
3095 kfree(calldata);
faf5f49c
TM		 3096}
3097
963d8fe5 3098static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3099{
963d8fe5 3100 struct nfs4_unlockdata *calldata = data;
faf5f49c 3101
06f814a3
TM		 3102 if (RPC_ASSASSINATED(task))
3103 return;
911d1aaf 3104 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3105 switch (task->tk_status) {
3106 case 0:
3107 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3108 calldata->res.stateid.data,
faf5f49c 3109 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3110 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3111 break;
3112 case -NFS4ERR_STALE_STATEID:
3113 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3114 break;
3115 default:
a6a352e9 3116 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3117 rpc_restart_call(task);
faf5f49c 3118 }
faf5f49c
TM		 3119}
3120
4ce70ada 3121static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3122{
4ce70ada 3123 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3124 struct rpc_message msg = {
3125 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3126 .rpc_argp = &calldata->arg,
3127 .rpc_resp = &calldata->res,
3128 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3129 };
faf5f49c 3130
911d1aaf 3131 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3132 return;
3133 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3134 /* Note: exit _without_ running nfs4_locku_done */
3135 task->tk_action = NULL;
faf5f49c
TM		 3136 return;
3137 }
26e976a8 3138 calldata->timestamp = jiffies;
faf5f49c
TM		 3139 rpc_call_setup(task, &msg, 0);
3140}
3141
963d8fe5 3142static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3143 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3144 .rpc_call_done = nfs4_locku_done,
06f814a3 3145 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3146};
3147
a5d16a4d
TM		 3148static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3149 struct nfs_open_context *ctx,
3150 struct nfs4_lock_state *lsp,
3151 struct nfs_seqid *seqid)
3152{
3153 struct nfs4_unlockdata *data;
a5d16a4d
TM		 3154
3155 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3156 if (data == NULL) {
3157 nfs_free_seqid(seqid);
3158 return ERR_PTR(-ENOMEM);
3159 }
3160
7a1218a2 3161 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3162}
3163
faf5f49c
TM		 3164static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3165{
911d1aaf 3166 struct nfs_seqid *seqid;
1da177e4 3167 struct nfs4_lock_state *lsp;
06f814a3
TM		 3168 struct rpc_task *task;
3169 int status = 0;
faf5f49c 3170
8d0a8a9d 3171 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3172 /* Unlock _before_ we do the RPC call */
3173 request->fl_flags |= FL_EXISTS;
3174 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3175 goto out;
8d0a8a9d 3176 if (status != 0)
9b073574
TM		 3177 goto out;
3178 /* Is this a delegated lock? */
3179 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3180 goto out;
8d0a8a9d 3181 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3182 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3183 status = -ENOMEM;
911d1aaf 3184 if (seqid == NULL)
9b073574 3185 goto out;
a5d16a4d
TM		 3186 task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3187 status = PTR_ERR(task);
3188 if (IS_ERR(task))
9b073574 3189 goto out;
a5d16a4d 3190 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3191 rpc_put_task(task);
9b073574 3192out:
1da177e4
LT		 3193 return status;
3194}
3195
a5d16a4d
TM		 3196struct nfs4_lockdata {
3197 struct nfs_lock_args arg;
3198 struct nfs_lock_res res;
3199 struct nfs4_lock_state *lsp;
3200 struct nfs_open_context *ctx;
3201 struct file_lock fl;
26e976a8 3202 unsigned long timestamp;
a5d16a4d
TM		 3203 int rpc_status;
3204 int cancelled;
3205};
3206
3207static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3208 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3209{
a5d16a4d
TM		 3210 struct nfs4_lockdata *p;
3211 struct inode *inode = lsp->ls_state->inode;
1da177e4 3212 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3213
3214 p = kzalloc(sizeof(*p), GFP_KERNEL);
3215 if (p == NULL)
3216 return NULL;
3217
3218 p->arg.fh = NFS_FH(inode);
3219 p->arg.fl = &p->fl;
3220 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3221 if (p->arg.lock_seqid == NULL)
3222 goto out_free;
3223 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3224 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
a5d16a4d
TM		 3225 p->arg.lock_owner.id = lsp->ls_id;
3226 p->lsp = lsp;
3227 atomic_inc(&lsp->ls_count);
3228 p->ctx = get_nfs_open_context(ctx);
3229 memcpy(&p->fl, fl, sizeof(p->fl));
3230 return p;
3231out_free:
3232 kfree(p);
3233 return NULL;
3234}
3235
3236static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3237{
3238 struct nfs4_lockdata *data = calldata;
3239 struct nfs4_state *state = data->lsp->ls_state;
3240 struct nfs4_state_owner *sp = state->owner;
1da177e4 3241 struct rpc_message msg = {
a5d16a4d
TM		 3242 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3243 .rpc_argp = &data->arg,
3244 .rpc_resp = &data->res,
3245 .rpc_cred = sp->so_cred,
1da177e4 3246 };
06735b34 3247
a5d16a4d
TM		 3248 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3249 return;
3250 dprintk("%s: begin!\n", __FUNCTION__);
3251 /* Do we need to do an open_to_lock_owner? */
3252 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3253 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3254 if (data->arg.open_seqid == NULL) {
3255 data->rpc_status = -ENOMEM;
3256 task->tk_action = NULL;
06735b34 3257 goto out;
8d0a8a9d 3258 }
a5d16a4d
TM		 3259 data->arg.open_stateid = &state->stateid;
3260 data->arg.new_lock_owner = 1;
3261 }
26e976a8 3262 data->timestamp = jiffies;
a5d16a4d 3263 rpc_call_setup(task, &msg, 0);
06735b34 3264out:
a5d16a4d
TM		 3265 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3266}
3267
3268static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3269{
3270 struct nfs4_lockdata *data = calldata;
3271
3272 dprintk("%s: begin!\n", __FUNCTION__);
3273
3274 data->rpc_status = task->tk_status;
3275 if (RPC_ASSASSINATED(task))
3276 goto out;
3277 if (data->arg.new_lock_owner != 0) {
3278 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3279 if (data->rpc_status == 0)
3280 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3281 else
3282 goto out;
3283 }
3284 if (data->rpc_status == 0) {
3285 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3286 sizeof(data->lsp->ls_stateid.data));
3287 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
26e976a8 3288 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3289 }
3290 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3291out:
3292 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3293}
3294
3295static void nfs4_lock_release(void *calldata)
3296{
3297 struct nfs4_lockdata *data = calldata;
3298
3299 dprintk("%s: begin!\n", __FUNCTION__);
3300 if (data->arg.open_seqid != NULL)
3301 nfs_free_seqid(data->arg.open_seqid);
3302 if (data->cancelled != 0) {
3303 struct rpc_task *task;
3304 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3305 data->arg.lock_seqid);
3306 if (!IS_ERR(task))
e6b3c4db 3307 rpc_put_task(task);
a5d16a4d
TM		 3308 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3309 } else
3310 nfs_free_seqid(data->arg.lock_seqid);
3311 nfs4_put_lock_state(data->lsp);
3312 put_nfs_open_context(data->ctx);
3313 kfree(data);
3314 dprintk("%s: done!\n", __FUNCTION__);
3315}
3316
3317static const struct rpc_call_ops nfs4_lock_ops = {
3318 .rpc_call_prepare = nfs4_lock_prepare,
3319 .rpc_call_done = nfs4_lock_done,
3320 .rpc_release = nfs4_lock_release,
3321};
3322
3323static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3324{
3325 struct nfs4_lockdata *data;
3326 struct rpc_task *task;
3327 int ret;
3328
3329 dprintk("%s: begin!\n", __FUNCTION__);
3330 data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3331 fl->fl_u.nfs4_fl.owner);
3332 if (data == NULL)
3333 return -ENOMEM;
3334 if (IS_SETLKW(cmd))
3335 data->arg.block = 1;
3336 if (reclaim != 0)
3337 data->arg.reclaim = 1;
3338 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3339 &nfs4_lock_ops, data);
7a1218a2 3340 if (IS_ERR(task))
a5d16a4d 3341 return PTR_ERR(task);
a5d16a4d
TM		 3342 ret = nfs4_wait_for_completion_rpc_task(task);
3343 if (ret == 0) {
3344 ret = data->rpc_status;
3345 if (ret == -NFS4ERR_DENIED)
3346 ret = -EAGAIN;
3347 } else
3348 data->cancelled = 1;
e6b3c4db 3349 rpc_put_task(task);
a5d16a4d
TM		 3350 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3351 return ret;
1da177e4
LT		 3352}
3353
3354static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3355{
202b50dc
TM		 3356 struct nfs_server *server = NFS_SERVER(state->inode);
3357 struct nfs4_exception exception = { };
3358 int err;
3359
3360 do {
42a2d13e
TM		 3361 /* Cache the lock if possible... */
3362 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3363 return 0;
202b50dc
TM		 3364 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3365 if (err != -NFS4ERR_DELAY)
3366 break;
3367 nfs4_handle_exception(server, err, &exception);
3368 } while (exception.retry);
3369 return err;
1da177e4
LT		 3370}
3371
3372static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3373{
202b50dc
TM		 3374 struct nfs_server *server = NFS_SERVER(state->inode);
3375 struct nfs4_exception exception = { };
3376 int err;
3377
6bfc93ef
TM		 3378 err = nfs4_set_lock_state(state, request);
3379 if (err != 0)
3380 return err;
202b50dc 3381 do {
42a2d13e
TM		 3382 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3383 return 0;
202b50dc
TM		 3384 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3385 if (err != -NFS4ERR_DELAY)
3386 break;
3387 nfs4_handle_exception(server, err, &exception);
3388 } while (exception.retry);
3389 return err;
1da177e4
LT		 3390}
3391
3392static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3393{
adfa6f98 3394 struct nfs_client *clp = state->owner->so_client;
01c3b861 3395 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3396 int status;
3397
6bfc93ef 3398 /* Is this a delegated open? */
6bfc93ef
TM		 3399 status = nfs4_set_lock_state(state, request);
3400 if (status != 0)
3401 goto out;
01c3b861
TM		 3402 request->fl_flags |= FL_ACCESS;
3403 status = do_vfs_lock(request->fl_file, request);
3404 if (status < 0)
3405 goto out;
3406 down_read(&clp->cl_sem);
3407 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3408 struct nfs_inode *nfsi = NFS_I(state->inode);
3409 /* Yes: cache locks! */
3410 down_read(&nfsi->rwsem);
3411 /* ...but avoid races with delegation recall... */
3412 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3413 request->fl_flags = fl_flags & ~FL_SLEEP;
3414 status = do_vfs_lock(request->fl_file, request);
3415 up_read(&nfsi->rwsem);
3416 goto out_unlock;
3417 }
3418 up_read(&nfsi->rwsem);
3419 }
6bfc93ef
TM		 3420 status = _nfs4_do_setlk(state, cmd, request, 0);
3421 if (status != 0)
01c3b861 3422 goto out_unlock;
6bfc93ef 3423 /* Note: we always want to sleep here! */
01c3b861 3424 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3425 if (do_vfs_lock(request->fl_file, request) < 0)
3426 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3427out_unlock:
1da177e4 3428 up_read(&clp->cl_sem);
01c3b861
TM		 3429out:
3430 request->fl_flags = fl_flags;
1da177e4
LT		 3431 return status;
3432}
3433
3434static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3435{
3436 struct nfs4_exception exception = { };
3437 int err;
3438
3439 do {
3440 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3441 _nfs4_proc_setlk(state, cmd, request),
3442 &exception);
3443 } while (exception.retry);
3444 return err;
3445}
3446
3447static int
3448nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3449{
3450 struct nfs_open_context *ctx;
3451 struct nfs4_state *state;
3452 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3453 int status;
3454
3455 /* verify open state */
3456 ctx = (struct nfs_open_context *)filp->private_data;
3457 state = ctx->state;
3458
3459 if (request->fl_start < 0 || request->fl_end < 0)
3460 return -EINVAL;
3461
3462 if (IS_GETLK(cmd))
3463 return nfs4_proc_getlk(state, F_GETLK, request);
3464
3465 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3466 return -EINVAL;
3467
3468 if (request->fl_type == F_UNLCK)
3469 return nfs4_proc_unlck(state, cmd, request);
3470
3471 do {
3472 status = nfs4_proc_setlk(state, cmd, request);
3473 if ((status != -EAGAIN) || IS_SETLK(cmd))
3474 break;
3475 timeout = nfs4_set_lock_task_retry(timeout);
3476 status = -ERESTARTSYS;
3477 if (signalled())
3478 break;
3479 } while(status < 0);
1da177e4
LT		 3480 return status;
3481}
3482
888e694c
TM		 3483int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3484{
3485 struct nfs_server *server = NFS_SERVER(state->inode);
3486 struct nfs4_exception exception = { };
3487 int err;
3488
3489 err = nfs4_set_lock_state(state, fl);
3490 if (err != 0)
3491 goto out;
3492 do {
3493 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3494 if (err != -NFS4ERR_DELAY)
3495 break;
3496 err = nfs4_handle_exception(server, err, &exception);
3497 } while (exception.retry);
3498out:
3499 return err;
3500}
6b3b5496 3501
aa1870af
BF		 3502#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3503
6b3b5496
BF		 3504int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3505 size_t buflen, int flags)
3506{
4b580ee3
BF		 3507 struct inode *inode = dentry->d_inode;
3508
3509 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3510 return -EOPNOTSUPP;
3511
3512 if (!S_ISREG(inode->i_mode) &&
3513 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3514 return -EPERM;
3515
3516 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3517}
3518
3519/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3520 * and that's what we'll do for e.g. user attributes that haven't been set.
3521 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3522 * attributes in kernel-managed attribute namespaces. */
3523ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3524 size_t buflen)
3525{
aa1870af
BF		 3526 struct inode *inode = dentry->d_inode;
3527
3528 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3529 return -EOPNOTSUPP;
3530
3531 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3532}
3533
3534ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3535{
aa1870af 3536 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3537
096455a2
BF		 3538 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3539 return 0;
6b3b5496
BF		 3540 if (buf && buflen < len)
3541 return -ERANGE;
3542 if (buf)
aa1870af
BF		 3543 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3544 return len;
6b3b5496
BF		 3545}
3546
c228fd3a 3547int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
7aaa0b3b 3548 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3549{
3550 struct nfs_server *server = NFS_SERVER(dir);
3551 u32 bitmask[2] = {
361e624f
MN		 3552 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3553 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3554 };
3555 struct nfs4_fs_locations_arg args = {
3556 .dir_fh = NFS_FH(dir),
c228fd3a 3557 .name = name,
683b57b4
TM		 3558 .page = page,
3559 .bitmask = bitmask,
3560 };
3561 struct rpc_message msg = {
3562 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3563 .rpc_argp = &args,
7aaa0b3b 3564 .rpc_resp = fs_locations,
683b57b4
TM		 3565 };
3566 int status;
3567
3568 dprintk("%s: start\n", __FUNCTION__);
c228fd3a 3569 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3570 fs_locations->server = server;
830b8e33 3571 fs_locations->nlocations = 0;
683b57b4
TM		 3572 status = rpc_call_sync(server->client, &msg, 0);
3573 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3574 return status;
3575}
3576
1da177e4
LT		 3577struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3578 .recover_open = nfs4_open_reclaim,
3579 .recover_lock = nfs4_lock_reclaim,
3580};
3581
3582struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3583 .recover_open = nfs4_open_expired,
3584 .recover_lock = nfs4_lock_expired,
3585};
3586
92e1d5be 3587static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3588 .permission = nfs_permission,
3589 .getattr = nfs_getattr,
3590 .setattr = nfs_setattr,
3591 .getxattr = nfs4_getxattr,
3592 .setxattr = nfs4_setxattr,
3593 .listxattr = nfs4_listxattr,
3594};
3595
509de811 3596const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3597 .version = 4, /* protocol version */
3598 .dentry_ops = &nfs4_dentry_operations,
3599 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3600 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3601 .getroot = nfs4_proc_get_root,
3602 .getattr = nfs4_proc_getattr,
3603 .setattr = nfs4_proc_setattr,
2b3de441 3604 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3605 .lookup = nfs4_proc_lookup,
3606 .access = nfs4_proc_access,
3607 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3608 .create = nfs4_proc_create,
3609 .remove = nfs4_proc_remove,
3610 .unlink_setup = nfs4_proc_unlink_setup,
3611 .unlink_done = nfs4_proc_unlink_done,
3612 .rename = nfs4_proc_rename,
3613 .link = nfs4_proc_link,
3614 .symlink = nfs4_proc_symlink,
3615 .mkdir = nfs4_proc_mkdir,
3616 .rmdir = nfs4_proc_remove,
3617 .readdir = nfs4_proc_readdir,
3618 .mknod = nfs4_proc_mknod,
3619 .statfs = nfs4_proc_statfs,
3620 .fsinfo = nfs4_proc_fsinfo,
3621 .pathconf = nfs4_proc_pathconf,
e9326dca 3622 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3623 .decode_dirent = nfs4_decode_dirent,
3624 .read_setup = nfs4_proc_read_setup,
ec06c096 3625 .read_done = nfs4_read_done,
1da177e4 3626 .write_setup = nfs4_proc_write_setup,
788e7a89 3627 .write_done = nfs4_write_done,
1da177e4 3628 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3629 .commit_done = nfs4_commit_done,
02a913a7
TM		 3630 .file_open = nfs_open,
3631 .file_release = nfs_release,
1da177e4 3632 .lock = nfs4_proc_lock,
e50a1c2e 3633 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3634};
3635
3636/*
3637 * Local variables:
3638 * c-basic-offset: 8
3639 * End:
3640 */
kernel source for telekom puls (alcatel/mediatek)