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NFSv4: Retry lease recovery if it failed during a synchronous operation.
[mirror_ubuntu-artful-kernel.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
58#define NFS4_POLL_RETRY_MIN (1*HZ)
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
1da177e4
LT		 141static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
142 struct nfs4_readdir_arg *readdir)
143{
144 u32 *start, *p;
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 */
165 start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
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;
639 rpc_release_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;
745 rpc_release_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:
7539bbab 1143 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 1144 break;
1145 default:
1146 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1147 rpc_restart_call(task);
1148 return;
1149 }
1150 }
516a6af6 1151 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1152}
1153
4ce70ada 1154static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1155{
4ce70ada 1156 struct nfs4_closedata *calldata = data;
9512135d 1157 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1158 struct rpc_message msg = {
1159 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1160 .rpc_argp = &calldata->arg,
1161 .rpc_resp = &calldata->res,
9512135d 1162 .rpc_cred = state->owner->so_cred,
1da177e4 1163 };
4cecb76f 1164 int mode = 0, old_mode;
9512135d 1165
963d8fe5 1166 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1167 return;
9512135d
TM		 1168 /* Recalculate the new open mode in case someone reopened the file
1169 * while we were waiting in line to be scheduled.
1170 */
4cecb76f
TM		 1171 spin_lock(&state->owner->so_lock);
1172 spin_lock(&calldata->inode->i_lock);
1173 mode = old_mode = state->state;
e7616923
TM		 1174 if (state->n_rdwr == 0) {
1175 if (state->n_rdonly == 0)
1176 mode &= ~FMODE_READ;
1177 if (state->n_wronly == 0)
1178 mode &= ~FMODE_WRITE;
1179 }
4cecb76f
TM		 1180 nfs4_state_set_mode_locked(state, mode);
1181 spin_unlock(&calldata->inode->i_lock);
1182 spin_unlock(&state->owner->so_lock);
1183 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
963d8fe5
TM		 1184 /* Note: exit _without_ calling nfs4_close_done */
1185 task->tk_action = NULL;
9512135d
TM		 1186 return;
1187 }
516a6af6 1188 nfs_fattr_init(calldata->res.fattr);
9512135d 1189 if (mode != 0)
1da177e4 1190 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d 1191 calldata->arg.open_flags = mode;
26e976a8 1192 calldata->timestamp = jiffies;
9512135d 1193 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1194}
1195
963d8fe5 1196static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1197 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1198 .rpc_call_done = nfs4_close_done,
1199 .rpc_release = nfs4_free_closedata,
1200};
1201
1da177e4
LT		 1202/*
1203 * It is possible for data to be read/written from a mem-mapped file
1204 * after the sys_close call (which hits the vfs layer as a flush).
1205 * This means that we can't safely call nfsv4 close on a file until
1206 * the inode is cleared. This in turn means that we are not good
1207 * NFSv4 citizens - we do not indicate to the server to update the file's
1208 * share state even when we are done with one of the three share
1209 * stateid's in the inode.
1210 *
1211 * NOTE: Caller must be holding the sp->so_owner semaphore!
1212 */
4cecb76f 1213int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1da177e4 1214{
516a6af6 1215 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1216 struct nfs4_closedata *calldata;
9512135d 1217 int status = -ENOMEM;
1da177e4 1218
9512135d 1219 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1220 if (calldata == NULL)
9512135d 1221 goto out;
1da177e4
LT		 1222 calldata->inode = inode;
1223 calldata->state = state;
1224 calldata->arg.fh = NFS_FH(inode);
9512135d 1225 calldata->arg.stateid = &state->stateid;
1da177e4 1226 /* Serialization for the sequence id */
cee54fc9 1227 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1228 if (calldata->arg.seqid == NULL)
1229 goto out_free_calldata;
516a6af6
TM		 1230 calldata->arg.bitmask = server->attr_bitmask;
1231 calldata->res.fattr = &calldata->fattr;
1232 calldata->res.server = server;
9512135d 1233
4ce70ada 1234 status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
9512135d
TM		 1235 if (status == 0)
1236 goto out;
1237
1238 nfs_free_seqid(calldata->arg.seqid);
1239out_free_calldata:
1240 kfree(calldata);
1241out:
1242 return status;
1da177e4
LT		 1243}
1244
95cf959b 1245static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
02a913a7
TM		 1246{
1247 struct file *filp;
1248
1249 filp = lookup_instantiate_filp(nd, dentry, NULL);
1250 if (!IS_ERR(filp)) {
1251 struct nfs_open_context *ctx;
1252 ctx = (struct nfs_open_context *)filp->private_data;
1253 ctx->state = state;
95cf959b
TM		 1254 return 0;
1255 }
1256 nfs4_close_state(state, nd->intent.open.flags);
1257 return PTR_ERR(filp);
02a913a7
TM		 1258}
1259
1260struct dentry *
1da177e4
LT		 1261nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1262{
1263 struct iattr attr;
1264 struct rpc_cred *cred;
1265 struct nfs4_state *state;
02a913a7 1266 struct dentry *res;
1da177e4
LT		 1267
1268 if (nd->flags & LOOKUP_CREATE) {
1269 attr.ia_mode = nd->intent.open.create_mode;
1270 attr.ia_valid = ATTR_MODE;
1271 if (!IS_POSIXACL(dir))
1272 attr.ia_mode &= ~current->fs->umask;
1273 } else {
1274 attr.ia_valid = 0;
1275 BUG_ON(nd->intent.open.flags & O_CREAT);
1276 }
1277
1f163415 1278 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1279 if (IS_ERR(cred))
02a913a7 1280 return (struct dentry *)cred;
1da177e4
LT		 1281 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1282 put_rpccred(cred);
02a913a7
TM		 1283 if (IS_ERR(state)) {
1284 if (PTR_ERR(state) == -ENOENT)
1285 d_add(dentry, NULL);
1286 return (struct dentry *)state;
1287 }
24ac23ab 1288 res = d_add_unique(dentry, igrab(state->inode));
02a913a7
TM		 1289 if (res != NULL)
1290 dentry = res;
1291 nfs4_intent_set_file(nd, dentry, state);
1292 return res;
1da177e4
LT		 1293}
1294
1295int
02a913a7 1296nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4
LT		 1297{
1298 struct rpc_cred *cred;
1299 struct nfs4_state *state;
1da177e4 1300
1f163415 1301 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1302 if (IS_ERR(cred))
1303 return PTR_ERR(cred);
1304 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1305 if (IS_ERR(state))
1306 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1307 put_rpccred(cred);
02a913a7
TM		 1308 if (IS_ERR(state)) {
1309 switch (PTR_ERR(state)) {
1310 case -EPERM:
1311 case -EACCES:
1312 case -EDQUOT:
1313 case -ENOSPC:
1314 case -EROFS:
1315 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1316 return 1;
1317 case -ENOENT:
1318 if (dentry->d_inode == NULL)
1319 return 1;
1320 }
1321 goto out_drop;
1322 }
24ac23ab 1323 if (state->inode == dentry->d_inode) {
02a913a7 1324 nfs4_intent_set_file(nd, dentry, state);
1da177e4
LT		 1325 return 1;
1326 }
1da177e4 1327 nfs4_close_state(state, openflags);
02a913a7
TM		 1328out_drop:
1329 d_drop(dentry);
1da177e4
LT		 1330 return 0;
1331}
1332
1333
1334static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1335{
1336 struct nfs4_server_caps_res res = {};
1337 struct rpc_message msg = {
1338 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1339 .rpc_argp = fhandle,
1340 .rpc_resp = &res,
1341 };
1342 int status;
1343
1344 status = rpc_call_sync(server->client, &msg, 0);
1345 if (status == 0) {
1346 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1347 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1348 server->caps |= NFS_CAP_ACLS;
1349 if (res.has_links != 0)
1350 server->caps |= NFS_CAP_HARDLINKS;
1351 if (res.has_symlinks != 0)
1352 server->caps |= NFS_CAP_SYMLINKS;
1353 server->acl_bitmask = res.acl_bitmask;
1354 }
1355 return status;
1356}
1357
55a97593 1358int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1359{
1360 struct nfs4_exception exception = { };
1361 int err;
1362 do {
1363 err = nfs4_handle_exception(server,
1364 _nfs4_server_capabilities(server, fhandle),
1365 &exception);
1366 } while (exception.retry);
1367 return err;
1368}
1369
1370static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1371 struct nfs_fsinfo *info)
1372{
1da177e4
LT		 1373 struct nfs4_lookup_root_arg args = {
1374 .bitmask = nfs4_fattr_bitmap,
1375 };
1376 struct nfs4_lookup_res res = {
1377 .server = server,
0e574af1 1378 .fattr = info->fattr,
1da177e4
LT		 1379 .fh = fhandle,
1380 };
1381 struct rpc_message msg = {
1382 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1383 .rpc_argp = &args,
1384 .rpc_resp = &res,
1385 };
0e574af1 1386 nfs_fattr_init(info->fattr);
1da177e4
LT		 1387 return rpc_call_sync(server->client, &msg, 0);
1388}
1389
1390static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1391 struct nfs_fsinfo *info)
1392{
1393 struct nfs4_exception exception = { };
1394 int err;
1395 do {
1396 err = nfs4_handle_exception(server,
1397 _nfs4_lookup_root(server, fhandle, info),
1398 &exception);
1399 } while (exception.retry);
1400 return err;
1401}
1402
54ceac45
DH		 1403/*
1404 * get the file handle for the "/" directory on the server
1405 */
1da177e4 1406static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1407 struct nfs_fsinfo *info)
1da177e4 1408{
1da177e4
LT		 1409 int status;
1410
1da177e4 1411 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1412 if (status == 0)
1413 status = nfs4_server_capabilities(server, fhandle);
1414 if (status == 0)
1415 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1416 return nfs4_map_errors(status);
1da177e4
LT		 1417}
1418
6b97fd3d
MN		 1419/*
1420 * Get locations and (maybe) other attributes of a referral.
1421 * Note that we'll actually follow the referral later when
1422 * we detect fsid mismatch in inode revalidation
1423 */
1424static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1425{
1426 int status = -ENOMEM;
1427 struct page *page = NULL;
1428 struct nfs4_fs_locations *locations = NULL;
1429 struct dentry dentry = {};
1430
1431 page = alloc_page(GFP_KERNEL);
1432 if (page == NULL)
1433 goto out;
1434 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1435 if (locations == NULL)
1436 goto out;
1437
1438 dentry.d_name.name = name->name;
1439 dentry.d_name.len = name->len;
1440 status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1441 if (status != 0)
1442 goto out;
1443 /* Make sure server returned a different fsid for the referral */
1444 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1445 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1446 status = -EIO;
1447 goto out;
1448 }
1449
1450 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1451 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1452 if (!fattr->mode)
1453 fattr->mode = S_IFDIR;
1454 memset(fhandle, 0, sizeof(struct nfs_fh));
1455out:
1456 if (page)
1457 __free_page(page);
1458 if (locations)
1459 kfree(locations);
1460 return status;
1461}
1462
1da177e4
LT		 1463static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1464{
1465 struct nfs4_getattr_arg args = {
1466 .fh = fhandle,
1467 .bitmask = server->attr_bitmask,
1468 };
1469 struct nfs4_getattr_res res = {
1470 .fattr = fattr,
1471 .server = server,
1472 };
1473 struct rpc_message msg = {
1474 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1475 .rpc_argp = &args,
1476 .rpc_resp = &res,
1477 };
1478
0e574af1 1479 nfs_fattr_init(fattr);
1da177e4
LT		 1480 return rpc_call_sync(server->client, &msg, 0);
1481}
1482
1483static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1484{
1485 struct nfs4_exception exception = { };
1486 int err;
1487 do {
1488 err = nfs4_handle_exception(server,
1489 _nfs4_proc_getattr(server, fhandle, fattr),
1490 &exception);
1491 } while (exception.retry);
1492 return err;
1493}
1494
1495/*
1496 * The file is not closed if it is opened due to the a request to change
1497 * the size of the file. The open call will not be needed once the
1498 * VFS layer lookup-intents are implemented.
1499 *
1500 * Close is called when the inode is destroyed.
1501 * If we haven't opened the file for O_WRONLY, we
1502 * need to in the size_change case to obtain a stateid.
1503 *
1504 * Got race?
1505 * Because OPEN is always done by name in nfsv4, it is
1506 * possible that we opened a different file by the same
1507 * name. We can recognize this race condition, but we
1508 * can't do anything about it besides returning an error.
1509 *
1510 * This will be fixed with VFS changes (lookup-intent).
1511 */
1512static int
1513nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1514 struct iattr *sattr)
1515{
08e9eac4
TM		 1516 struct rpc_cred *cred;
1517 struct inode *inode = dentry->d_inode;
d530838b
TM		 1518 struct nfs_open_context *ctx;
1519 struct nfs4_state *state = NULL;
1da177e4
LT		 1520 int status;
1521
0e574af1 1522 nfs_fattr_init(fattr);
1da177e4 1523
1f163415 1524 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1525 if (IS_ERR(cred))
1526 return PTR_ERR(cred);
d530838b
TM		 1527
1528 /* Search for an existing open(O_WRITE) file */
1529 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1530 if (ctx != NULL)
1531 state = ctx->state;
08e9eac4 1532
3e4f6290 1533 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1534 if (status == 0)
1535 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1536 if (ctx != NULL)
1537 put_nfs_open_context(ctx);
08e9eac4 1538 put_rpccred(cred);
1da177e4
LT		 1539 return status;
1540}
1541
2b3de441
DH		 1542static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1543 struct qstr *name, struct nfs_fh *fhandle,
1544 struct nfs_fattr *fattr)
1545{
1546 int status;
1547 struct nfs4_lookup_arg args = {
1548 .bitmask = server->attr_bitmask,
1549 .dir_fh = dirfh,
1550 .name = name,
1551 };
1552 struct nfs4_lookup_res res = {
1553 .server = server,
1554 .fattr = fattr,
1555 .fh = fhandle,
1556 };
1557 struct rpc_message msg = {
1558 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1559 .rpc_argp = &args,
1560 .rpc_resp = &res,
1561 };
1562
1563 nfs_fattr_init(fattr);
1564
1565 dprintk("NFS call lookupfh %s\n", name->name);
1566 status = rpc_call_sync(server->client, &msg, 0);
1567 dprintk("NFS reply lookupfh: %d\n", status);
1568 if (status == -NFS4ERR_MOVED)
1569 status = -EREMOTE;
1570 return status;
1571}
1572
1573static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1574 struct qstr *name, struct nfs_fh *fhandle,
1575 struct nfs_fattr *fattr)
1576{
1577 struct nfs4_exception exception = { };
1578 int err;
1579 do {
1580 err = nfs4_handle_exception(server,
1581 _nfs4_proc_lookupfh(server, dirfh, name,
1582 fhandle, fattr),
1583 &exception);
1584 } while (exception.retry);
1585 return err;
1586}
1587
1da177e4
LT		 1588static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1589 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1590{
1591 int status;
1592 struct nfs_server *server = NFS_SERVER(dir);
1593 struct nfs4_lookup_arg args = {
1594 .bitmask = server->attr_bitmask,
1595 .dir_fh = NFS_FH(dir),
1596 .name = name,
1597 };
1598 struct nfs4_lookup_res res = {
1599 .server = server,
1600 .fattr = fattr,
1601 .fh = fhandle,
1602 };
1603 struct rpc_message msg = {
1604 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1605 .rpc_argp = &args,
1606 .rpc_resp = &res,
1607 };
1608
0e574af1 1609 nfs_fattr_init(fattr);
1da177e4
LT		 1610
1611 dprintk("NFS call lookup %s\n", name->name);
1612 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
6b97fd3d
MN		 1613 if (status == -NFS4ERR_MOVED)
1614 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1615 dprintk("NFS reply lookup: %d\n", status);
1616 return status;
1617}
1618
1619static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1620{
1621 struct nfs4_exception exception = { };
1622 int err;
1623 do {
1624 err = nfs4_handle_exception(NFS_SERVER(dir),
1625 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1626 &exception);
1627 } while (exception.retry);
1628 return err;
1629}
1630
1631static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1632{
1633 struct nfs4_accessargs args = {
1634 .fh = NFS_FH(inode),
1635 };
1636 struct nfs4_accessres res = { 0 };
1637 struct rpc_message msg = {
1638 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1639 .rpc_argp = &args,
1640 .rpc_resp = &res,
1641 .rpc_cred = entry->cred,
1642 };
1643 int mode = entry->mask;
1644 int status;
1645
1646 /*
1647 * Determine which access bits we want to ask for...
1648 */
1649 if (mode & MAY_READ)
1650 args.access |= NFS4_ACCESS_READ;
1651 if (S_ISDIR(inode->i_mode)) {
1652 if (mode & MAY_WRITE)
1653 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1654 if (mode & MAY_EXEC)
1655 args.access |= NFS4_ACCESS_LOOKUP;
1656 } else {
1657 if (mode & MAY_WRITE)
1658 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1659 if (mode & MAY_EXEC)
1660 args.access |= NFS4_ACCESS_EXECUTE;
1661 }
1662 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1663 if (!status) {
1664 entry->mask = 0;
1665 if (res.access & NFS4_ACCESS_READ)
1666 entry->mask |= MAY_READ;
1667 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1668 entry->mask |= MAY_WRITE;
1669 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1670 entry->mask |= MAY_EXEC;
1671 }
1672 return status;
1673}
1674
1675static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1676{
1677 struct nfs4_exception exception = { };
1678 int err;
1679 do {
1680 err = nfs4_handle_exception(NFS_SERVER(inode),
1681 _nfs4_proc_access(inode, entry),
1682 &exception);
1683 } while (exception.retry);
1684 return err;
1685}
1686
1687/*
1688 * TODO: For the time being, we don't try to get any attributes
1689 * along with any of the zero-copy operations READ, READDIR,
1690 * READLINK, WRITE.
1691 *
1692 * In the case of the first three, we want to put the GETATTR
1693 * after the read-type operation -- this is because it is hard
1694 * to predict the length of a GETATTR response in v4, and thus
1695 * align the READ data correctly. This means that the GETATTR
1696 * may end up partially falling into the page cache, and we should
1697 * shift it into the 'tail' of the xdr_buf before processing.
1698 * To do this efficiently, we need to know the total length
1699 * of data received, which doesn't seem to be available outside
1700 * of the RPC layer.
1701 *
1702 * In the case of WRITE, we also want to put the GETATTR after
1703 * the operation -- in this case because we want to make sure
1704 * we get the post-operation mtime and size. This means that
1705 * we can't use xdr_encode_pages() as written: we need a variant
1706 * of it which would leave room in the 'tail' iovec.
1707 *
1708 * Both of these changes to the XDR layer would in fact be quite
1709 * minor, but I decided to leave them for a subsequent patch.
1710 */
1711static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1712 unsigned int pgbase, unsigned int pglen)
1713{
1714 struct nfs4_readlink args = {
1715 .fh = NFS_FH(inode),
1716 .pgbase = pgbase,
1717 .pglen = pglen,
1718 .pages = &page,
1719 };
1720 struct rpc_message msg = {
1721 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1722 .rpc_argp = &args,
1723 .rpc_resp = NULL,
1724 };
1725
1726 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1727}
1728
1729static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1730 unsigned int pgbase, unsigned int pglen)
1731{
1732 struct nfs4_exception exception = { };
1733 int err;
1734 do {
1735 err = nfs4_handle_exception(NFS_SERVER(inode),
1736 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1737 &exception);
1738 } while (exception.retry);
1739 return err;
1740}
1741
1742static int _nfs4_proc_read(struct nfs_read_data *rdata)
1743{
1744 int flags = rdata->flags;
1745 struct inode *inode = rdata->inode;
1746 struct nfs_fattr *fattr = rdata->res.fattr;
1747 struct nfs_server *server = NFS_SERVER(inode);
1748 struct rpc_message msg = {
1749 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1750 .rpc_argp = &rdata->args,
1751 .rpc_resp = &rdata->res,
1752 .rpc_cred = rdata->cred,
1753 };
1754 unsigned long timestamp = jiffies;
1755 int status;
1756
1757 dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
1758 (long long) rdata->args.offset);
1759
0e574af1 1760 nfs_fattr_init(fattr);
1da177e4
LT		 1761 status = rpc_call_sync(server->client, &msg, flags);
1762 if (!status)
1763 renew_lease(server, timestamp);
1764 dprintk("NFS reply read: %d\n", status);
1765 return status;
1766}
1767
1768static int nfs4_proc_read(struct nfs_read_data *rdata)
1769{
1770 struct nfs4_exception exception = { };
1771 int err;
1772 do {
1773 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1774 _nfs4_proc_read(rdata),
1775 &exception);
1776 } while (exception.retry);
1777 return err;
1778}
1779
1780static int _nfs4_proc_write(struct nfs_write_data *wdata)
1781{
1782 int rpcflags = wdata->flags;
1783 struct inode *inode = wdata->inode;
1784 struct nfs_fattr *fattr = wdata->res.fattr;
1785 struct nfs_server *server = NFS_SERVER(inode);
1786 struct rpc_message msg = {
1787 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1788 .rpc_argp = &wdata->args,
1789 .rpc_resp = &wdata->res,
1790 .rpc_cred = wdata->cred,
1791 };
1792 int status;
1793
1794 dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
1795 (long long) wdata->args.offset);
1796
3b6efee9
TM		 1797 wdata->args.bitmask = server->attr_bitmask;
1798 wdata->res.server = server;
26e976a8 1799 wdata->timestamp = jiffies;
0e574af1 1800 nfs_fattr_init(fattr);
1da177e4
LT		 1801 status = rpc_call_sync(server->client, &msg, rpcflags);
1802 dprintk("NFS reply write: %d\n", status);
3b6efee9
TM		 1803 if (status < 0)
1804 return status;
26e976a8 1805 renew_lease(server, wdata->timestamp);
3b6efee9
TM		 1806 nfs_post_op_update_inode(inode, fattr);
1807 return wdata->res.count;
1da177e4
LT		 1808}
1809
1810static int nfs4_proc_write(struct nfs_write_data *wdata)
1811{
1812 struct nfs4_exception exception = { };
1813 int err;
1814 do {
1815 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1816 _nfs4_proc_write(wdata),
1817 &exception);
1818 } while (exception.retry);
1819 return err;
1820}
1821
1822static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1823{
1824 struct inode *inode = cdata->inode;
1825 struct nfs_fattr *fattr = cdata->res.fattr;
1826 struct nfs_server *server = NFS_SERVER(inode);
1827 struct rpc_message msg = {
1828 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1829 .rpc_argp = &cdata->args,
1830 .rpc_resp = &cdata->res,
1831 .rpc_cred = cdata->cred,
1832 };
1833 int status;
1834
1835 dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
1836 (long long) cdata->args.offset);
1837
3b6efee9
TM		 1838 cdata->args.bitmask = server->attr_bitmask;
1839 cdata->res.server = server;
26e976a8 1840 cdata->timestamp = jiffies;
0e574af1 1841 nfs_fattr_init(fattr);
1da177e4 1842 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1843 if (status >= 0)
1844 renew_lease(server, cdata->timestamp);
1da177e4 1845 dprintk("NFS reply commit: %d\n", status);
3b6efee9
TM		 1846 if (status >= 0)
1847 nfs_post_op_update_inode(inode, fattr);
1da177e4
LT		 1848 return status;
1849}
1850
1851static int nfs4_proc_commit(struct nfs_write_data *cdata)
1852{
1853 struct nfs4_exception exception = { };
1854 int err;
1855 do {
1856 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1857 _nfs4_proc_commit(cdata),
1858 &exception);
1859 } while (exception.retry);
1860 return err;
1861}
1862
1863/*
1864 * Got race?
1865 * We will need to arrange for the VFS layer to provide an atomic open.
1866 * Until then, this create/open method is prone to inefficiency and race
1867 * conditions due to the lookup, create, and open VFS calls from sys_open()
1868 * placed on the wire.
1869 *
1870 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1871 * The file will be opened again in the subsequent VFS open call
1872 * (nfs4_proc_file_open).
1873 *
1874 * The open for read will just hang around to be used by any process that
1875 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1876 */
1877
1878static int
1879nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1880 int flags, struct nameidata *nd)
1da177e4
LT		 1881{
1882 struct nfs4_state *state;
1883 struct rpc_cred *cred;
1884 int status = 0;
1885
1f163415 1886 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1887 if (IS_ERR(cred)) {
1888 status = PTR_ERR(cred);
1889 goto out;
1890 }
1891 state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1892 put_rpccred(cred);
1893 if (IS_ERR(state)) {
1894 status = PTR_ERR(state);
1895 goto out;
1896 }
24ac23ab 1897 d_instantiate(dentry, igrab(state->inode));
1da177e4
LT		 1898 if (flags & O_EXCL) {
1899 struct nfs_fattr fattr;
3e4f6290 1900 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1901 if (status == 0)
65e4308d 1902 nfs_setattr_update_inode(state->inode, sattr);
02a913a7
TM		 1903 }
1904 if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
95cf959b 1905 status = nfs4_intent_set_file(nd, dentry, state);
02a913a7
TM		 1906 else
1907 nfs4_close_state(state, flags);
1da177e4
LT		 1908out:
1909 return status;
1910}
1911
1912static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1913{
16e42959 1914 struct nfs_server *server = NFS_SERVER(dir);
1da177e4
LT		 1915 struct nfs4_remove_arg args = {
1916 .fh = NFS_FH(dir),
1917 .name = name,
16e42959
TM		 1918 .bitmask = server->attr_bitmask,
1919 };
1920 struct nfs_fattr dir_attr;
1921 struct nfs4_remove_res res = {
1922 .server = server,
1923 .dir_attr = &dir_attr,
1da177e4 1924 };
1da177e4
LT		 1925 struct rpc_message msg = {
1926 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1927 .rpc_argp = &args,
1928 .rpc_resp = &res,
1929 };
1930 int status;
1931
16e42959
TM		 1932 nfs_fattr_init(res.dir_attr);
1933 status = rpc_call_sync(server->client, &msg, 0);
1934 if (status == 0) {
1935 update_changeattr(dir, &res.cinfo);
1936 nfs_post_op_update_inode(dir, res.dir_attr);
1937 }
1da177e4
LT		 1938 return status;
1939}
1940
1941static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1942{
1943 struct nfs4_exception exception = { };
1944 int err;
1945 do {
1946 err = nfs4_handle_exception(NFS_SERVER(dir),
1947 _nfs4_proc_remove(dir, name),
1948 &exception);
1949 } while (exception.retry);
1950 return err;
1951}
1952
1953struct unlink_desc {
1954 struct nfs4_remove_arg args;
16e42959
TM		 1955 struct nfs4_remove_res res;
1956 struct nfs_fattr dir_attr;
1da177e4
LT		 1957};
1958
1959static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1960 struct qstr *name)
1961{
16e42959 1962 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1da177e4
LT		 1963 struct unlink_desc *up;
1964
1965 up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1966 if (!up)
1967 return -ENOMEM;
1968
1969 up->args.fh = NFS_FH(dir->d_inode);
1970 up->args.name = name;
16e42959
TM		 1971 up->args.bitmask = server->attr_bitmask;
1972 up->res.server = server;
1973 up->res.dir_attr = &up->dir_attr;
1da177e4
LT		 1974
1975 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1976 msg->rpc_argp = &up->args;
1977 msg->rpc_resp = &up->res;
1978 return 0;
1979}
1980
1981static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1982{
1983 struct rpc_message *msg = &task->tk_msg;
1984 struct unlink_desc *up;
1985
1986 if (msg->rpc_resp != NULL) {
1987 up = container_of(msg->rpc_resp, struct unlink_desc, res);
16e42959
TM		 1988 update_changeattr(dir->d_inode, &up->res.cinfo);
1989 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1da177e4
LT		 1990 kfree(up);
1991 msg->rpc_resp = NULL;
1992 msg->rpc_argp = NULL;
1993 }
1994 return 0;
1995}
1996
1997static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1998 struct inode *new_dir, struct qstr *new_name)
1999{
6caf2c82 2000 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 2001 struct nfs4_rename_arg arg = {
2002 .old_dir = NFS_FH(old_dir),
2003 .new_dir = NFS_FH(new_dir),
2004 .old_name = old_name,
2005 .new_name = new_name,
6caf2c82
TM		 2006 .bitmask = server->attr_bitmask,
2007 };
2008 struct nfs_fattr old_fattr, new_fattr;
2009 struct nfs4_rename_res res = {
2010 .server = server,
2011 .old_fattr = &old_fattr,
2012 .new_fattr = &new_fattr,
1da177e4 2013 };
1da177e4
LT		 2014 struct rpc_message msg = {
2015 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2016 .rpc_argp = &arg,
2017 .rpc_resp = &res,
2018 };
2019 int status;
2020
6caf2c82
TM		 2021 nfs_fattr_init(res.old_fattr);
2022 nfs_fattr_init(res.new_fattr);
2023 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2024
2025 if (!status) {
2026 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2027 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2028 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2029 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2030 }
2031 return status;
2032}
2033
2034static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2035 struct inode *new_dir, struct qstr *new_name)
2036{
2037 struct nfs4_exception exception = { };
2038 int err;
2039 do {
2040 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2041 _nfs4_proc_rename(old_dir, old_name,
2042 new_dir, new_name),
2043 &exception);
2044 } while (exception.retry);
2045 return err;
2046}
2047
2048static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2049{
91ba2eee 2050 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2051 struct nfs4_link_arg arg = {
2052 .fh = NFS_FH(inode),
2053 .dir_fh = NFS_FH(dir),
2054 .name = name,
91ba2eee
TM		 2055 .bitmask = server->attr_bitmask,
2056 };
2057 struct nfs_fattr fattr, dir_attr;
2058 struct nfs4_link_res res = {
2059 .server = server,
2060 .fattr = &fattr,
2061 .dir_attr = &dir_attr,
1da177e4 2062 };
1da177e4
LT		 2063 struct rpc_message msg = {
2064 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2065 .rpc_argp = &arg,
91ba2eee 2066 .rpc_resp = &res,
1da177e4
LT		 2067 };
2068 int status;
2069
91ba2eee
TM		 2070 nfs_fattr_init(res.fattr);
2071 nfs_fattr_init(res.dir_attr);
2072 status = rpc_call_sync(server->client, &msg, 0);
2073 if (!status) {
2074 update_changeattr(dir, &res.cinfo);
2075 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2076 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2077 }
1da177e4
LT		 2078
2079 return status;
2080}
2081
2082static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2083{
2084 struct nfs4_exception exception = { };
2085 int err;
2086 do {
2087 err = nfs4_handle_exception(NFS_SERVER(inode),
2088 _nfs4_proc_link(inode, dir, name),
2089 &exception);
2090 } while (exception.retry);
2091 return err;
2092}
2093
4f390c15 2094static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2095 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2096{
2097 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 2098 struct nfs_fh fhandle;
2099 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2100 struct nfs4_create_arg arg = {
2101 .dir_fh = NFS_FH(dir),
2102 .server = server,
4f390c15 2103 .name = &dentry->d_name,
1da177e4
LT		 2104 .attrs = sattr,
2105 .ftype = NF4LNK,
2106 .bitmask = server->attr_bitmask,
2107 };
2108 struct nfs4_create_res res = {
2109 .server = server,
4f390c15
CL		 2110 .fh = &fhandle,
2111 .fattr = &fattr,
56ae19f3 2112 .dir_fattr = &dir_fattr,
1da177e4
LT		 2113 };
2114 struct rpc_message msg = {
2115 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2116 .rpc_argp = &arg,
2117 .rpc_resp = &res,
2118 };
2119 int status;
2120
94a6d753 2121 if (len > NFS4_MAXPATHLEN)
1da177e4 2122 return -ENAMETOOLONG;
4f390c15 2123
94a6d753
CL		 2124 arg.u.symlink.pages = &page;
2125 arg.u.symlink.len = len;
4f390c15 2126 nfs_fattr_init(&fattr);
56ae19f3 2127 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2128
2129 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2130 if (!status) {
1da177e4 2131 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2132 nfs_post_op_update_inode(dir, res.dir_fattr);
2133 status = nfs_instantiate(dentry, &fhandle, &fattr);
2134 }
1da177e4
LT		 2135 return status;
2136}
2137
4f390c15 2138static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2139 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2140{
2141 struct nfs4_exception exception = { };
2142 int err;
2143 do {
2144 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2145 _nfs4_proc_symlink(dir, dentry, page,
2146 len, sattr),
1da177e4
LT		 2147 &exception);
2148 } while (exception.retry);
2149 return err;
2150}
2151
2152static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2153 struct iattr *sattr)
2154{
2155 struct nfs_server *server = NFS_SERVER(dir);
2156 struct nfs_fh fhandle;
56ae19f3 2157 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2158 struct nfs4_create_arg arg = {
2159 .dir_fh = NFS_FH(dir),
2160 .server = server,
2161 .name = &dentry->d_name,
2162 .attrs = sattr,
2163 .ftype = NF4DIR,
2164 .bitmask = server->attr_bitmask,
2165 };
2166 struct nfs4_create_res res = {
2167 .server = server,
2168 .fh = &fhandle,
2169 .fattr = &fattr,
56ae19f3 2170 .dir_fattr = &dir_fattr,
1da177e4
LT		 2171 };
2172 struct rpc_message msg = {
2173 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2174 .rpc_argp = &arg,
2175 .rpc_resp = &res,
2176 };
2177 int status;
2178
0e574af1 2179 nfs_fattr_init(&fattr);
56ae19f3 2180 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2181
2182 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2183 if (!status) {
2184 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2185 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2186 status = nfs_instantiate(dentry, &fhandle, &fattr);
2187 }
2188 return status;
2189}
2190
2191static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2192 struct iattr *sattr)
2193{
2194 struct nfs4_exception exception = { };
2195 int err;
2196 do {
2197 err = nfs4_handle_exception(NFS_SERVER(dir),
2198 _nfs4_proc_mkdir(dir, dentry, sattr),
2199 &exception);
2200 } while (exception.retry);
2201 return err;
2202}
2203
2204static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2205 u64 cookie, struct page *page, unsigned int count, int plus)
2206{
2207 struct inode *dir = dentry->d_inode;
2208 struct nfs4_readdir_arg args = {
2209 .fh = NFS_FH(dir),
2210 .pages = &page,
2211 .pgbase = 0,
2212 .count = count,
2213 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2214 };
2215 struct nfs4_readdir_res res;
2216 struct rpc_message msg = {
2217 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2218 .rpc_argp = &args,
2219 .rpc_resp = &res,
2220 .rpc_cred = cred,
2221 };
2222 int status;
2223
eadf4598
TM		 2224 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2225 dentry->d_parent->d_name.name,
2226 dentry->d_name.name,
2227 (unsigned long long)cookie);
1da177e4
LT		 2228 lock_kernel();
2229 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2230 res.pgbase = args.pgbase;
2231 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2232 if (status == 0)
2233 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2234 unlock_kernel();
eadf4598 2235 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2236 return status;
2237}
2238
2239static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2240 u64 cookie, struct page *page, unsigned int count, int plus)
2241{
2242 struct nfs4_exception exception = { };
2243 int err;
2244 do {
2245 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2246 _nfs4_proc_readdir(dentry, cred, cookie,
2247 page, count, plus),
2248 &exception);
2249 } while (exception.retry);
2250 return err;
2251}
2252
2253static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2254 struct iattr *sattr, dev_t rdev)
2255{
2256 struct nfs_server *server = NFS_SERVER(dir);
2257 struct nfs_fh fh;
56ae19f3 2258 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2259 struct nfs4_create_arg arg = {
2260 .dir_fh = NFS_FH(dir),
2261 .server = server,
2262 .name = &dentry->d_name,
2263 .attrs = sattr,
2264 .bitmask = server->attr_bitmask,
2265 };
2266 struct nfs4_create_res res = {
2267 .server = server,
2268 .fh = &fh,
2269 .fattr = &fattr,
56ae19f3 2270 .dir_fattr = &dir_fattr,
1da177e4
LT		 2271 };
2272 struct rpc_message msg = {
2273 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2274 .rpc_argp = &arg,
2275 .rpc_resp = &res,
2276 };
2277 int status;
2278 int mode = sattr->ia_mode;
2279
0e574af1 2280 nfs_fattr_init(&fattr);
56ae19f3 2281 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2282
2283 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2284 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2285 if (S_ISFIFO(mode))
2286 arg.ftype = NF4FIFO;
2287 else if (S_ISBLK(mode)) {
2288 arg.ftype = NF4BLK;
2289 arg.u.device.specdata1 = MAJOR(rdev);
2290 arg.u.device.specdata2 = MINOR(rdev);
2291 }
2292 else if (S_ISCHR(mode)) {
2293 arg.ftype = NF4CHR;
2294 arg.u.device.specdata1 = MAJOR(rdev);
2295 arg.u.device.specdata2 = MINOR(rdev);
2296 }
2297 else
2298 arg.ftype = NF4SOCK;
2299
2300 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2301 if (status == 0) {
2302 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2303 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2304 status = nfs_instantiate(dentry, &fh, &fattr);
2305 }
2306 return status;
2307}
2308
2309static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2310 struct iattr *sattr, dev_t rdev)
2311{
2312 struct nfs4_exception exception = { };
2313 int err;
2314 do {
2315 err = nfs4_handle_exception(NFS_SERVER(dir),
2316 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2317 &exception);
2318 } while (exception.retry);
2319 return err;
2320}
2321
2322static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2323 struct nfs_fsstat *fsstat)
2324{
2325 struct nfs4_statfs_arg args = {
2326 .fh = fhandle,
2327 .bitmask = server->attr_bitmask,
2328 };
2329 struct rpc_message msg = {
2330 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2331 .rpc_argp = &args,
2332 .rpc_resp = fsstat,
2333 };
2334
0e574af1 2335 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2336 return rpc_call_sync(server->client, &msg, 0);
2337}
2338
2339static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2340{
2341 struct nfs4_exception exception = { };
2342 int err;
2343 do {
2344 err = nfs4_handle_exception(server,
2345 _nfs4_proc_statfs(server, fhandle, fsstat),
2346 &exception);
2347 } while (exception.retry);
2348 return err;
2349}
2350
2351static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2352 struct nfs_fsinfo *fsinfo)
2353{
2354 struct nfs4_fsinfo_arg args = {
2355 .fh = fhandle,
2356 .bitmask = server->attr_bitmask,
2357 };
2358 struct rpc_message msg = {
2359 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2360 .rpc_argp = &args,
2361 .rpc_resp = fsinfo,
2362 };
2363
2364 return rpc_call_sync(server->client, &msg, 0);
2365}
2366
2367static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2368{
2369 struct nfs4_exception exception = { };
2370 int err;
2371
2372 do {
2373 err = nfs4_handle_exception(server,
2374 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2375 &exception);
2376 } while (exception.retry);
2377 return err;
2378}
2379
2380static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2381{
0e574af1 2382 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2383 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2384}
2385
2386static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2387 struct nfs_pathconf *pathconf)
2388{
2389 struct nfs4_pathconf_arg args = {
2390 .fh = fhandle,
2391 .bitmask = server->attr_bitmask,
2392 };
2393 struct rpc_message msg = {
2394 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2395 .rpc_argp = &args,
2396 .rpc_resp = pathconf,
2397 };
2398
2399 /* None of the pathconf attributes are mandatory to implement */
2400 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2401 memset(pathconf, 0, sizeof(*pathconf));
2402 return 0;
2403 }
2404
0e574af1 2405 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2406 return rpc_call_sync(server->client, &msg, 0);
2407}
2408
2409static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2410 struct nfs_pathconf *pathconf)
2411{
2412 struct nfs4_exception exception = { };
2413 int err;
2414
2415 do {
2416 err = nfs4_handle_exception(server,
2417 _nfs4_proc_pathconf(server, fhandle, pathconf),
2418 &exception);
2419 } while (exception.retry);
2420 return err;
2421}
2422
ec06c096 2423static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2424{
ec06c096 2425 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2426
ec06c096 2427 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2428 rpc_restart_call(task);
ec06c096 2429 return -EAGAIN;
1da177e4
LT		 2430 }
2431 if (task->tk_status > 0)
ec06c096
TM		 2432 renew_lease(server, data->timestamp);
2433 return 0;
1da177e4
LT		 2434}
2435
ec06c096 2436static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2437{
1da177e4
LT		 2438 struct rpc_message msg = {
2439 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2440 .rpc_argp = &data->args,
2441 .rpc_resp = &data->res,
2442 .rpc_cred = data->cred,
2443 };
1da177e4
LT		 2444
2445 data->timestamp = jiffies;
2446
ec06c096 2447 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2448}
2449
788e7a89 2450static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2451{
1da177e4
LT		 2452 struct inode *inode = data->inode;
2453
2454 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2455 rpc_restart_call(task);
788e7a89 2456 return -EAGAIN;
1da177e4 2457 }
4f9838c7 2458 if (task->tk_status >= 0) {
1da177e4 2459 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2460 nfs_post_op_update_inode(inode, data->res.fattr);
2461 }
788e7a89 2462 return 0;
1da177e4
LT		 2463}
2464
788e7a89 2465static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2466{
1da177e4
LT		 2467 struct rpc_message msg = {
2468 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2469 .rpc_argp = &data->args,
2470 .rpc_resp = &data->res,
2471 .rpc_cred = data->cred,
2472 };
2473 struct inode *inode = data->inode;
4f9838c7 2474 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2475 int stable;
1da177e4
LT		 2476
2477 if (how & FLUSH_STABLE) {
2478 if (!NFS_I(inode)->ncommit)
2479 stable = NFS_FILE_SYNC;
2480 else
2481 stable = NFS_DATA_SYNC;
2482 } else
2483 stable = NFS_UNSTABLE;
2484 data->args.stable = stable;
4f9838c7
TM		 2485 data->args.bitmask = server->attr_bitmask;
2486 data->res.server = server;
1da177e4
LT		 2487
2488 data->timestamp = jiffies;
2489
1da177e4 2490 /* Finalize the task. */
788e7a89 2491 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2492}
2493
788e7a89 2494static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2495{
1da177e4
LT		 2496 struct inode *inode = data->inode;
2497
2498 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2499 rpc_restart_call(task);
788e7a89 2500 return -EAGAIN;
1da177e4 2501 }
4f9838c7
TM		 2502 if (task->tk_status >= 0)
2503 nfs_post_op_update_inode(inode, data->res.fattr);
788e7a89 2504 return 0;
1da177e4
LT		 2505}
2506
788e7a89 2507static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2508{
1da177e4
LT		 2509 struct rpc_message msg = {
2510 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2511 .rpc_argp = &data->args,
2512 .rpc_resp = &data->res,
2513 .rpc_cred = data->cred,
2514 };
788e7a89 2515 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2516
4f9838c7
TM		 2517 data->args.bitmask = server->attr_bitmask;
2518 data->res.server = server;
2519
788e7a89 2520 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2521}
2522
2523/*
2524 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2525 * standalone procedure for queueing an asynchronous RENEW.
2526 */
963d8fe5 2527static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2528{
adfa6f98 2529 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2530 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2531
2532 if (task->tk_status < 0) {
2533 switch (task->tk_status) {
2534 case -NFS4ERR_STALE_CLIENTID:
2535 case -NFS4ERR_EXPIRED:
2536 case -NFS4ERR_CB_PATH_DOWN:
2537 nfs4_schedule_state_recovery(clp);
2538 }
2539 return;
2540 }
2541 spin_lock(&clp->cl_lock);
2542 if (time_before(clp->cl_last_renewal,timestamp))
2543 clp->cl_last_renewal = timestamp;
2544 spin_unlock(&clp->cl_lock);
2545}
2546
963d8fe5
TM		 2547static const struct rpc_call_ops nfs4_renew_ops = {
2548 .rpc_call_done = nfs4_renew_done,
2549};
2550
adfa6f98 2551int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2552{
2553 struct rpc_message msg = {
2554 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2555 .rpc_argp = clp,
b4454fe1 2556 .rpc_cred = cred,
1da177e4
LT		 2557 };
2558
2559 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2560 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2561}
2562
adfa6f98 2563int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2564{
2565 struct rpc_message msg = {
2566 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2567 .rpc_argp = clp,
b4454fe1 2568 .rpc_cred = cred,
1da177e4
LT		 2569 };
2570 unsigned long now = jiffies;
2571 int status;
2572
2573 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2574 if (status < 0)
2575 return status;
2576 spin_lock(&clp->cl_lock);
2577 if (time_before(clp->cl_last_renewal,now))
2578 clp->cl_last_renewal = now;
2579 spin_unlock(&clp->cl_lock);
2580 return 0;
2581}
2582
aa1870af
BF		 2583static inline int nfs4_server_supports_acls(struct nfs_server *server)
2584{
2585 return (server->caps & NFS_CAP_ACLS)
2586 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2587 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2588}
2589
2590/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2591 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2592 * the stack.
2593 */
2594#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2595
2596static void buf_to_pages(const void *buf, size_t buflen,
2597 struct page **pages, unsigned int *pgbase)
2598{
2599 const void *p = buf;
2600
2601 *pgbase = offset_in_page(buf);
2602 p -= *pgbase;
2603 while (p < buf + buflen) {
2604 *(pages++) = virt_to_page(p);
2605 p += PAGE_CACHE_SIZE;
2606 }
2607}
2608
e50a1c2e
BF		 2609struct nfs4_cached_acl {
2610 int cached;
2611 size_t len;
3e9d4154 2612 char data[0];
e50a1c2e
BF		 2613};
2614
2615static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2616{
2617 struct nfs_inode *nfsi = NFS_I(inode);
2618
2619 spin_lock(&inode->i_lock);
2620 kfree(nfsi->nfs4_acl);
2621 nfsi->nfs4_acl = acl;
2622 spin_unlock(&inode->i_lock);
2623}
2624
2625static void nfs4_zap_acl_attr(struct inode *inode)
2626{
2627 nfs4_set_cached_acl(inode, NULL);
2628}
2629
2630static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2631{
2632 struct nfs_inode *nfsi = NFS_I(inode);
2633 struct nfs4_cached_acl *acl;
2634 int ret = -ENOENT;
2635
2636 spin_lock(&inode->i_lock);
2637 acl = nfsi->nfs4_acl;
2638 if (acl == NULL)
2639 goto out;
2640 if (buf == NULL) /* user is just asking for length */
2641 goto out_len;
2642 if (acl->cached == 0)
2643 goto out;
2644 ret = -ERANGE; /* see getxattr(2) man page */
2645 if (acl->len > buflen)
2646 goto out;
2647 memcpy(buf, acl->data, acl->len);
2648out_len:
2649 ret = acl->len;
2650out:
2651 spin_unlock(&inode->i_lock);
2652 return ret;
2653}
2654
2655static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2656{
2657 struct nfs4_cached_acl *acl;
2658
2659 if (buf && acl_len <= PAGE_SIZE) {
2660 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2661 if (acl == NULL)
2662 goto out;
2663 acl->cached = 1;
2664 memcpy(acl->data, buf, acl_len);
2665 } else {
2666 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2667 if (acl == NULL)
2668 goto out;
2669 acl->cached = 0;
2670 }
2671 acl->len = acl_len;
2672out:
2673 nfs4_set_cached_acl(inode, acl);
2674}
2675
16b4289c 2676static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2677{
aa1870af
BF		 2678 struct page *pages[NFS4ACL_MAXPAGES];
2679 struct nfs_getaclargs args = {
2680 .fh = NFS_FH(inode),
2681 .acl_pages = pages,
2682 .acl_len = buflen,
2683 };
2684 size_t resp_len = buflen;
e50a1c2e 2685 void *resp_buf;
aa1870af
BF		 2686 struct rpc_message msg = {
2687 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2688 .rpc_argp = &args,
2689 .rpc_resp = &resp_len,
2690 };
e50a1c2e 2691 struct page *localpage = NULL;
aa1870af
BF		 2692 int ret;
2693
e50a1c2e
BF		 2694 if (buflen < PAGE_SIZE) {
2695 /* As long as we're doing a round trip to the server anyway,
2696 * let's be prepared for a page of acl data. */
2697 localpage = alloc_page(GFP_KERNEL);
2698 resp_buf = page_address(localpage);
2699 if (localpage == NULL)
2700 return -ENOMEM;
2701 args.acl_pages[0] = localpage;
2702 args.acl_pgbase = 0;
1d95db8e 2703 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2704 } else {
2705 resp_buf = buf;
2706 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2707 }
aa1870af 2708 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2709 if (ret)
2710 goto out_free;
2711 if (resp_len > args.acl_len)
2712 nfs4_write_cached_acl(inode, NULL, resp_len);
2713 else
2714 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2715 if (buf) {
2716 ret = -ERANGE;
2717 if (resp_len > buflen)
2718 goto out_free;
2719 if (localpage)
2720 memcpy(buf, resp_buf, resp_len);
2721 }
2722 ret = resp_len;
2723out_free:
2724 if (localpage)
2725 __free_page(localpage);
aa1870af
BF		 2726 return ret;
2727}
2728
16b4289c
TM		 2729static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2730{
2731 struct nfs4_exception exception = { };
2732 ssize_t ret;
2733 do {
2734 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2735 if (ret >= 0)
2736 break;
2737 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2738 } while (exception.retry);
2739 return ret;
2740}
2741
e50a1c2e
BF		 2742static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2743{
2744 struct nfs_server *server = NFS_SERVER(inode);
2745 int ret;
2746
2747 if (!nfs4_server_supports_acls(server))
2748 return -EOPNOTSUPP;
2749 ret = nfs_revalidate_inode(server, inode);
2750 if (ret < 0)
2751 return ret;
2752 ret = nfs4_read_cached_acl(inode, buf, buflen);
2753 if (ret != -ENOENT)
2754 return ret;
2755 return nfs4_get_acl_uncached(inode, buf, buflen);
2756}
2757
16b4289c 2758static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2759{
2760 struct nfs_server *server = NFS_SERVER(inode);
2761 struct page *pages[NFS4ACL_MAXPAGES];
2762 struct nfs_setaclargs arg = {
2763 .fh = NFS_FH(inode),
2764 .acl_pages = pages,
2765 .acl_len = buflen,
2766 };
2767 struct rpc_message msg = {
2768 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2769 .rpc_argp = &arg,
2770 .rpc_resp = NULL,
2771 };
2772 int ret;
2773
2774 if (!nfs4_server_supports_acls(server))
2775 return -EOPNOTSUPP;
642ac549 2776 nfs_inode_return_delegation(inode);
4b580ee3 2777 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2778 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2779 if (ret == 0)
2780 nfs4_write_cached_acl(inode, buf, buflen);
4b580ee3
BF		 2781 return ret;
2782}
2783
16b4289c
TM		 2784static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2785{
2786 struct nfs4_exception exception = { };
2787 int err;
2788 do {
2789 err = nfs4_handle_exception(NFS_SERVER(inode),
2790 __nfs4_proc_set_acl(inode, buf, buflen),
2791 &exception);
2792 } while (exception.retry);
2793 return err;
2794}
2795
1da177e4 2796static int
faf5f49c 2797nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2798{
7539bbab 2799 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2800
2801 if (!clp || task->tk_status >= 0)
2802 return 0;
2803 switch(task->tk_status) {
2804 case -NFS4ERR_STALE_CLIENTID:
2805 case -NFS4ERR_STALE_STATEID:
2806 case -NFS4ERR_EXPIRED:
2807 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2808 nfs4_schedule_state_recovery(clp);
433fbe4c 2809 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2810 rpc_wake_up_task(task);
2811 task->tk_status = 0;
2812 return -EAGAIN;
1da177e4 2813 case -NFS4ERR_DELAY:
006ea73e
CL		 2814 nfs_inc_server_stats((struct nfs_server *) server,
2815 NFSIOS_DELAY);
2816 case -NFS4ERR_GRACE:
1da177e4
LT		 2817 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2818 task->tk_status = 0;
2819 return -EAGAIN;
2820 case -NFS4ERR_OLD_STATEID:
2821 task->tk_status = 0;
2822 return -EAGAIN;
2823 }
2824 task->tk_status = nfs4_map_errors(task->tk_status);
2825 return 0;
2826}
2827
433fbe4c
TM		 2828static int nfs4_wait_bit_interruptible(void *word)
2829{
2830 if (signal_pending(current))
2831 return -ERESTARTSYS;
2832 schedule();
2833 return 0;
2834}
2835
adfa6f98 2836static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2837{
1da177e4 2838 sigset_t oldset;
433fbe4c 2839 int res;
1da177e4
LT		 2840
2841 might_sleep();
2842
2843 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2844 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2845 nfs4_wait_bit_interruptible,
2846 TASK_INTERRUPTIBLE);
1da177e4
LT		 2847 rpc_clnt_sigunmask(clnt, &oldset);
2848 return res;
2849}
2850
2851static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2852{
2853 sigset_t oldset;
2854 int res = 0;
2855
2856 might_sleep();
2857
2858 if (*timeout <= 0)
2859 *timeout = NFS4_POLL_RETRY_MIN;
2860 if (*timeout > NFS4_POLL_RETRY_MAX)
2861 *timeout = NFS4_POLL_RETRY_MAX;
2862 rpc_clnt_sigmask(clnt, &oldset);
2863 if (clnt->cl_intr) {
041e0e3b 2864 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2865 if (signalled())
2866 res = -ERESTARTSYS;
041e0e3b
NA		 2867 } else
2868 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2869 rpc_clnt_sigunmask(clnt, &oldset);
2870 *timeout <<= 1;
2871 return res;
2872}
2873
2874/* This is the error handling routine for processes that are allowed
2875 * to sleep.
2876 */
faf5f49c 2877int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2878{
7539bbab 2879 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2880 int ret = errorcode;
2881
2882 exception->retry = 0;
2883 switch(errorcode) {
2884 case 0:
2885 return 0;
2886 case -NFS4ERR_STALE_CLIENTID:
2887 case -NFS4ERR_STALE_STATEID:
2888 case -NFS4ERR_EXPIRED:
433fbe4c 2889 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2890 ret = nfs4_wait_clnt_recover(server->client, clp);
2891 if (ret == 0)
2892 exception->retry = 1;
2893 break;
2894 case -NFS4ERR_GRACE:
2895 case -NFS4ERR_DELAY:
2896 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2897 if (ret != 0)
2898 break;
1da177e4 2899 case -NFS4ERR_OLD_STATEID:
2c56617d 2900 exception->retry = 1;
1da177e4
LT		 2901 }
2902 /* We failed to handle the error */
2903 return nfs4_map_errors(ret);
2904}
2905
adfa6f98 2906int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2907{
2908 nfs4_verifier sc_verifier;
2909 struct nfs4_setclientid setclientid = {
2910 .sc_verifier = &sc_verifier,
2911 .sc_prog = program,
2912 };
2913 struct rpc_message msg = {
2914 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2915 .rpc_argp = &setclientid,
2916 .rpc_resp = clp,
286d7d6a 2917 .rpc_cred = cred,
1da177e4
LT		 2918 };
2919 u32 *p;
2920 int loop = 0;
2921 int status;
2922
2923 p = (u32*)sc_verifier.data;
2924 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2925 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2926
2927 for(;;) {
2928 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2929 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2930 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2931 cred->cr_ops->cr_name,
1da177e4
LT		 2932 clp->cl_id_uniquifier);
2933 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2934 sizeof(setclientid.sc_netid), "tcp");
2935 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2936 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2937 clp->cl_ipaddr, port >> 8, port & 255);
2938
2939 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2940 if (status != -NFS4ERR_CLID_INUSE)
2941 break;
2942 if (signalled())
2943 break;
2944 if (loop++ & 1)
2945 ssleep(clp->cl_lease_time + 1);
2946 else
2947 if (++clp->cl_id_uniquifier == 0)
2948 break;
2949 }
2950 return status;
2951}
2952
adfa6f98 2953static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2954{
2955 struct nfs_fsinfo fsinfo;
2956 struct rpc_message msg = {
2957 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2958 .rpc_argp = clp,
2959 .rpc_resp = &fsinfo,
286d7d6a 2960 .rpc_cred = cred,
1da177e4
LT		 2961 };
2962 unsigned long now;
2963 int status;
2964
2965 now = jiffies;
2966 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2967 if (status == 0) {
2968 spin_lock(&clp->cl_lock);
2969 clp->cl_lease_time = fsinfo.lease_time * HZ;
2970 clp->cl_last_renewal = now;
58d9714a 2971 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2972 spin_unlock(&clp->cl_lock);
2973 }
2974 return status;
2975}
2976
adfa6f98 2977int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2978{
2979 long timeout;
2980 int err;
2981 do {
2982 err = _nfs4_proc_setclientid_confirm(clp, cred);
2983 switch (err) {
2984 case 0:
2985 return err;
2986 case -NFS4ERR_RESOURCE:
2987 /* The IBM lawyers misread another document! */
2988 case -NFS4ERR_DELAY:
2989 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2990 }
2991 } while (err == 0);
2992 return err;
2993}
2994
fe650407
TM		 2995struct nfs4_delegreturndata {
2996 struct nfs4_delegreturnargs args;
fa178f29 2997 struct nfs4_delegreturnres res;
fe650407
TM		 2998 struct nfs_fh fh;
2999 nfs4_stateid stateid;
3000 struct rpc_cred *cred;
26e976a8 3001 unsigned long timestamp;
fa178f29 3002 struct nfs_fattr fattr;
fe650407
TM		 3003 int rpc_status;
3004};
3005
3006static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 3007{
fe650407 3008 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 3009 struct rpc_message msg = {
3010 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 3011 .rpc_argp = &data->args,
fa178f29 3012 .rpc_resp = &data->res,
fe650407 3013 .rpc_cred = data->cred,
1da177e4 3014 };
fa178f29 3015 nfs_fattr_init(data->res.fattr);
fe650407
TM		 3016 rpc_call_setup(task, &msg, 0);
3017}
1da177e4 3018
fe650407
TM		 3019static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3020{
3021 struct nfs4_delegreturndata *data = calldata;
3022 data->rpc_status = task->tk_status;
26e976a8 3023 if (data->rpc_status == 0)
fa178f29 3024 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 3025}
3026
3027static void nfs4_delegreturn_release(void *calldata)
3028{
3029 struct nfs4_delegreturndata *data = calldata;
3030
3031 put_rpccred(data->cred);
3032 kfree(calldata);
3033}
3034
c8d149f3 3035static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 3036 .rpc_call_prepare = nfs4_delegreturn_prepare,
3037 .rpc_call_done = nfs4_delegreturn_done,
3038 .rpc_release = nfs4_delegreturn_release,
3039};
3040
3041static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3042{
3043 struct nfs4_delegreturndata *data;
fa178f29 3044 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 3045 struct rpc_task *task;
3046 int status;
3047
3048 data = kmalloc(sizeof(*data), GFP_KERNEL);
3049 if (data == NULL)
3050 return -ENOMEM;
3051 data->args.fhandle = &data->fh;
3052 data->args.stateid = &data->stateid;
fa178f29 3053 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3054 nfs_copy_fh(&data->fh, NFS_FH(inode));
3055 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3056 data->res.fattr = &data->fattr;
3057 data->res.server = server;
fe650407 3058 data->cred = get_rpccred(cred);
26e976a8 3059 data->timestamp = jiffies;
fe650407
TM		 3060 data->rpc_status = 0;
3061
3062 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 3063 if (IS_ERR(task))
fe650407 3064 return PTR_ERR(task);
fe650407 3065 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 3066 if (status == 0) {
fe650407 3067 status = data->rpc_status;
fa178f29
TM		 3068 if (status == 0)
3069 nfs_post_op_update_inode(inode, &data->fattr);
3070 }
fe650407
TM		 3071 rpc_release_task(task);
3072 return status;
1da177e4
LT		 3073}
3074
3075int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3076{
3077 struct nfs_server *server = NFS_SERVER(inode);
3078 struct nfs4_exception exception = { };
3079 int err;
3080 do {
3081 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3082 switch (err) {
3083 case -NFS4ERR_STALE_STATEID:
3084 case -NFS4ERR_EXPIRED:
7539bbab 3085 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 3086 case 0:
3087 return 0;
3088 }
3089 err = nfs4_handle_exception(server, err, &exception);
3090 } while (exception.retry);
3091 return err;
3092}
3093
3094#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3095#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3096
3097/*
3098 * sleep, with exponential backoff, and retry the LOCK operation.
3099 */
3100static unsigned long
3101nfs4_set_lock_task_retry(unsigned long timeout)
3102{
041e0e3b 3103 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3104 timeout <<= 1;
3105 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3106 return NFS4_LOCK_MAXTIMEOUT;
3107 return timeout;
3108}
3109
1da177e4
LT		 3110static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3111{
3112 struct inode *inode = state->inode;
3113 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3114 struct nfs_client *clp = server->nfs_client;
911d1aaf 3115 struct nfs_lockt_args arg = {
1da177e4 3116 .fh = NFS_FH(inode),
911d1aaf 3117 .fl = request,
1da177e4 3118 };
911d1aaf
TM		 3119 struct nfs_lockt_res res = {
3120 .denied = request,
1da177e4
LT		 3121 };
3122 struct rpc_message msg = {
3123 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3124 .rpc_argp = &arg,
3125 .rpc_resp = &res,
3126 .rpc_cred = state->owner->so_cred,
3127 };
1da177e4
LT		 3128 struct nfs4_lock_state *lsp;
3129 int status;
3130
3131 down_read(&clp->cl_sem);
911d1aaf 3132 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3133 status = nfs4_set_lock_state(state, request);
3134 if (status != 0)
3135 goto out;
3136 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3137 arg.lock_owner.id = lsp->ls_id;
1da177e4 3138 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3139 switch (status) {
3140 case 0:
3141 request->fl_type = F_UNLCK;
3142 break;
3143 case -NFS4ERR_DENIED:
3144 status = 0;
1da177e4 3145 }
8d0a8a9d 3146out:
1da177e4
LT		 3147 up_read(&clp->cl_sem);
3148 return status;
3149}
3150
3151static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3152{
3153 struct nfs4_exception exception = { };
3154 int err;
3155
3156 do {
3157 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3158 _nfs4_proc_getlk(state, cmd, request),
3159 &exception);
3160 } while (exception.retry);
3161 return err;
3162}
3163
3164static int do_vfs_lock(struct file *file, struct file_lock *fl)
3165{
3166 int res = 0;
3167 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3168 case FL_POSIX:
3169 res = posix_lock_file_wait(file, fl);
3170 break;
3171 case FL_FLOCK:
3172 res = flock_lock_file_wait(file, fl);
3173 break;
3174 default:
3175 BUG();
3176 }
1da177e4
LT		 3177 return res;
3178}
3179
faf5f49c 3180struct nfs4_unlockdata {
911d1aaf
TM		 3181 struct nfs_locku_args arg;
3182 struct nfs_locku_res res;
faf5f49c
TM		 3183 struct nfs4_lock_state *lsp;
3184 struct nfs_open_context *ctx;
911d1aaf
TM		 3185 struct file_lock fl;
3186 const struct nfs_server *server;
26e976a8 3187 unsigned long timestamp;
faf5f49c
TM		 3188};
3189
911d1aaf
TM		 3190static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3191 struct nfs_open_context *ctx,
3192 struct nfs4_lock_state *lsp,
3193 struct nfs_seqid *seqid)
3194{
3195 struct nfs4_unlockdata *p;
3196 struct inode *inode = lsp->ls_state->inode;
3197
3198 p = kmalloc(sizeof(*p), GFP_KERNEL);
3199 if (p == NULL)
3200 return NULL;
3201 p->arg.fh = NFS_FH(inode);
3202 p->arg.fl = &p->fl;
3203 p->arg.seqid = seqid;
3204 p->arg.stateid = &lsp->ls_stateid;
3205 p->lsp = lsp;
3206 atomic_inc(&lsp->ls_count);
3207 /* Ensure we don't close file until we're done freeing locks! */
3208 p->ctx = get_nfs_open_context(ctx);
3209 memcpy(&p->fl, fl, sizeof(p->fl));
3210 p->server = NFS_SERVER(inode);
3211 return p;
3212}
3213
06f814a3 3214static void nfs4_locku_release_calldata(void *data)
faf5f49c 3215{
963d8fe5 3216 struct nfs4_unlockdata *calldata = data;
911d1aaf 3217 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3218 nfs4_put_lock_state(calldata->lsp);
3219 put_nfs_open_context(calldata->ctx);
3220 kfree(calldata);
faf5f49c
TM		 3221}
3222
963d8fe5 3223static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3224{
963d8fe5 3225 struct nfs4_unlockdata *calldata = data;
faf5f49c 3226
06f814a3
TM		 3227 if (RPC_ASSASSINATED(task))
3228 return;
911d1aaf 3229 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3230 switch (task->tk_status) {
3231 case 0:
3232 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3233 calldata->res.stateid.data,
faf5f49c 3234 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3235 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3236 break;
3237 case -NFS4ERR_STALE_STATEID:
3238 case -NFS4ERR_EXPIRED:
7539bbab 3239 nfs4_schedule_state_recovery(calldata->server->nfs_client);
faf5f49c
TM		 3240 break;
3241 default:
911d1aaf 3242 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
faf5f49c 3243 rpc_restart_call(task);
faf5f49c
TM		 3244 }
3245 }
faf5f49c
TM		 3246}
3247
4ce70ada 3248static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3249{
4ce70ada 3250 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3251 struct rpc_message msg = {
3252 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3253 .rpc_argp = &calldata->arg,
3254 .rpc_resp = &calldata->res,
3255 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3256 };
faf5f49c 3257
911d1aaf 3258 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3259 return;
3260 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3261 /* Note: exit _without_ running nfs4_locku_done */
3262 task->tk_action = NULL;
faf5f49c
TM		 3263 return;
3264 }
26e976a8 3265 calldata->timestamp = jiffies;
faf5f49c
TM		 3266 rpc_call_setup(task, &msg, 0);
3267}
3268
963d8fe5 3269static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3270 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3271 .rpc_call_done = nfs4_locku_done,
06f814a3 3272 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3273};
3274
a5d16a4d
TM		 3275static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3276 struct nfs_open_context *ctx,
3277 struct nfs4_lock_state *lsp,
3278 struct nfs_seqid *seqid)
3279{
3280 struct nfs4_unlockdata *data;
a5d16a4d
TM		 3281
3282 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3283 if (data == NULL) {
3284 nfs_free_seqid(seqid);
3285 return ERR_PTR(-ENOMEM);
3286 }
3287
7a1218a2 3288 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3289}
3290
faf5f49c
TM		 3291static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3292{
911d1aaf 3293 struct nfs_seqid *seqid;
1da177e4 3294 struct nfs4_lock_state *lsp;
06f814a3
TM		 3295 struct rpc_task *task;
3296 int status = 0;
faf5f49c 3297
8d0a8a9d 3298 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3299 /* Unlock _before_ we do the RPC call */
3300 request->fl_flags |= FL_EXISTS;
3301 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3302 goto out;
8d0a8a9d 3303 if (status != 0)
9b073574
TM		 3304 goto out;
3305 /* Is this a delegated lock? */
3306 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3307 goto out;
8d0a8a9d 3308 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3309 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3310 status = -ENOMEM;
911d1aaf 3311 if (seqid == NULL)
9b073574 3312 goto out;
a5d16a4d
TM		 3313 task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3314 status = PTR_ERR(task);
3315 if (IS_ERR(task))
9b073574 3316 goto out;
a5d16a4d
TM		 3317 status = nfs4_wait_for_completion_rpc_task(task);
3318 rpc_release_task(task);
9b073574 3319out:
1da177e4
LT		 3320 return status;
3321}
3322
a5d16a4d
TM		 3323struct nfs4_lockdata {
3324 struct nfs_lock_args arg;
3325 struct nfs_lock_res res;
3326 struct nfs4_lock_state *lsp;
3327 struct nfs_open_context *ctx;
3328 struct file_lock fl;
26e976a8 3329 unsigned long timestamp;
a5d16a4d
TM		 3330 int rpc_status;
3331 int cancelled;
3332};
3333
3334static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3335 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3336{
a5d16a4d
TM		 3337 struct nfs4_lockdata *p;
3338 struct inode *inode = lsp->ls_state->inode;
1da177e4 3339 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3340
3341 p = kzalloc(sizeof(*p), GFP_KERNEL);
3342 if (p == NULL)
3343 return NULL;
3344
3345 p->arg.fh = NFS_FH(inode);
3346 p->arg.fl = &p->fl;
3347 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3348 if (p->arg.lock_seqid == NULL)
3349 goto out_free;
3350 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3351 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
a5d16a4d
TM		 3352 p->arg.lock_owner.id = lsp->ls_id;
3353 p->lsp = lsp;
3354 atomic_inc(&lsp->ls_count);
3355 p->ctx = get_nfs_open_context(ctx);
3356 memcpy(&p->fl, fl, sizeof(p->fl));
3357 return p;
3358out_free:
3359 kfree(p);
3360 return NULL;
3361}
3362
3363static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3364{
3365 struct nfs4_lockdata *data = calldata;
3366 struct nfs4_state *state = data->lsp->ls_state;
3367 struct nfs4_state_owner *sp = state->owner;
1da177e4 3368 struct rpc_message msg = {
a5d16a4d
TM		 3369 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3370 .rpc_argp = &data->arg,
3371 .rpc_resp = &data->res,
3372 .rpc_cred = sp->so_cred,
1da177e4 3373 };
06735b34 3374
a5d16a4d
TM		 3375 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3376 return;
3377 dprintk("%s: begin!\n", __FUNCTION__);
3378 /* Do we need to do an open_to_lock_owner? */
3379 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3380 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3381 if (data->arg.open_seqid == NULL) {
3382 data->rpc_status = -ENOMEM;
3383 task->tk_action = NULL;
06735b34 3384 goto out;
8d0a8a9d 3385 }
a5d16a4d
TM		 3386 data->arg.open_stateid = &state->stateid;
3387 data->arg.new_lock_owner = 1;
3388 }
26e976a8 3389 data->timestamp = jiffies;
a5d16a4d 3390 rpc_call_setup(task, &msg, 0);
06735b34 3391out:
a5d16a4d
TM		 3392 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3393}
3394
3395static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3396{
3397 struct nfs4_lockdata *data = calldata;
3398
3399 dprintk("%s: begin!\n", __FUNCTION__);
3400
3401 data->rpc_status = task->tk_status;
3402 if (RPC_ASSASSINATED(task))
3403 goto out;
3404 if (data->arg.new_lock_owner != 0) {
3405 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3406 if (data->rpc_status == 0)
3407 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3408 else
3409 goto out;
3410 }
3411 if (data->rpc_status == 0) {
3412 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3413 sizeof(data->lsp->ls_stateid.data));
3414 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
26e976a8 3415 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3416 }
3417 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3418out:
3419 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3420}
3421
3422static void nfs4_lock_release(void *calldata)
3423{
3424 struct nfs4_lockdata *data = calldata;
3425
3426 dprintk("%s: begin!\n", __FUNCTION__);
3427 if (data->arg.open_seqid != NULL)
3428 nfs_free_seqid(data->arg.open_seqid);
3429 if (data->cancelled != 0) {
3430 struct rpc_task *task;
3431 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3432 data->arg.lock_seqid);
3433 if (!IS_ERR(task))
3434 rpc_release_task(task);
3435 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3436 } else
3437 nfs_free_seqid(data->arg.lock_seqid);
3438 nfs4_put_lock_state(data->lsp);
3439 put_nfs_open_context(data->ctx);
3440 kfree(data);
3441 dprintk("%s: done!\n", __FUNCTION__);
3442}
3443
3444static const struct rpc_call_ops nfs4_lock_ops = {
3445 .rpc_call_prepare = nfs4_lock_prepare,
3446 .rpc_call_done = nfs4_lock_done,
3447 .rpc_release = nfs4_lock_release,
3448};
3449
3450static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3451{
3452 struct nfs4_lockdata *data;
3453 struct rpc_task *task;
3454 int ret;
3455
3456 dprintk("%s: begin!\n", __FUNCTION__);
3457 data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3458 fl->fl_u.nfs4_fl.owner);
3459 if (data == NULL)
3460 return -ENOMEM;
3461 if (IS_SETLKW(cmd))
3462 data->arg.block = 1;
3463 if (reclaim != 0)
3464 data->arg.reclaim = 1;
3465 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3466 &nfs4_lock_ops, data);
7a1218a2 3467 if (IS_ERR(task))
a5d16a4d 3468 return PTR_ERR(task);
a5d16a4d
TM		 3469 ret = nfs4_wait_for_completion_rpc_task(task);
3470 if (ret == 0) {
3471 ret = data->rpc_status;
3472 if (ret == -NFS4ERR_DENIED)
3473 ret = -EAGAIN;
3474 } else
3475 data->cancelled = 1;
3476 rpc_release_task(task);
3477 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3478 return ret;
1da177e4
LT		 3479}
3480
3481static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3482{
202b50dc
TM		 3483 struct nfs_server *server = NFS_SERVER(state->inode);
3484 struct nfs4_exception exception = { };
3485 int err;
3486
3487 do {
42a2d13e
TM		 3488 /* Cache the lock if possible... */
3489 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3490 return 0;
202b50dc
TM		 3491 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3492 if (err != -NFS4ERR_DELAY)
3493 break;
3494 nfs4_handle_exception(server, err, &exception);
3495 } while (exception.retry);
3496 return err;
1da177e4
LT		 3497}
3498
3499static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3500{
202b50dc
TM		 3501 struct nfs_server *server = NFS_SERVER(state->inode);
3502 struct nfs4_exception exception = { };
3503 int err;
3504
6bfc93ef
TM		 3505 err = nfs4_set_lock_state(state, request);
3506 if (err != 0)
3507 return err;
202b50dc 3508 do {
42a2d13e
TM		 3509 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3510 return 0;
202b50dc
TM		 3511 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3512 if (err != -NFS4ERR_DELAY)
3513 break;
3514 nfs4_handle_exception(server, err, &exception);
3515 } while (exception.retry);
3516 return err;
1da177e4
LT		 3517}
3518
3519static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3520{
adfa6f98 3521 struct nfs_client *clp = state->owner->so_client;
01c3b861 3522 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3523 int status;
3524
6bfc93ef 3525 /* Is this a delegated open? */
6bfc93ef
TM		 3526 status = nfs4_set_lock_state(state, request);
3527 if (status != 0)
3528 goto out;
01c3b861
TM		 3529 request->fl_flags |= FL_ACCESS;
3530 status = do_vfs_lock(request->fl_file, request);
3531 if (status < 0)
3532 goto out;
3533 down_read(&clp->cl_sem);
3534 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3535 struct nfs_inode *nfsi = NFS_I(state->inode);
3536 /* Yes: cache locks! */
3537 down_read(&nfsi->rwsem);
3538 /* ...but avoid races with delegation recall... */
3539 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3540 request->fl_flags = fl_flags & ~FL_SLEEP;
3541 status = do_vfs_lock(request->fl_file, request);
3542 up_read(&nfsi->rwsem);
3543 goto out_unlock;
3544 }
3545 up_read(&nfsi->rwsem);
3546 }
6bfc93ef
TM		 3547 status = _nfs4_do_setlk(state, cmd, request, 0);
3548 if (status != 0)
01c3b861 3549 goto out_unlock;
6bfc93ef 3550 /* Note: we always want to sleep here! */
01c3b861 3551 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3552 if (do_vfs_lock(request->fl_file, request) < 0)
3553 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3554out_unlock:
1da177e4 3555 up_read(&clp->cl_sem);
01c3b861
TM		 3556out:
3557 request->fl_flags = fl_flags;
1da177e4
LT		 3558 return status;
3559}
3560
3561static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3562{
3563 struct nfs4_exception exception = { };
3564 int err;
3565
3566 do {
3567 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3568 _nfs4_proc_setlk(state, cmd, request),
3569 &exception);
3570 } while (exception.retry);
3571 return err;
3572}
3573
3574static int
3575nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3576{
3577 struct nfs_open_context *ctx;
3578 struct nfs4_state *state;
3579 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3580 int status;
3581
3582 /* verify open state */
3583 ctx = (struct nfs_open_context *)filp->private_data;
3584 state = ctx->state;
3585
3586 if (request->fl_start < 0 || request->fl_end < 0)
3587 return -EINVAL;
3588
3589 if (IS_GETLK(cmd))
3590 return nfs4_proc_getlk(state, F_GETLK, request);
3591
3592 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3593 return -EINVAL;
3594
3595 if (request->fl_type == F_UNLCK)
3596 return nfs4_proc_unlck(state, cmd, request);
3597
3598 do {
3599 status = nfs4_proc_setlk(state, cmd, request);
3600 if ((status != -EAGAIN) || IS_SETLK(cmd))
3601 break;
3602 timeout = nfs4_set_lock_task_retry(timeout);
3603 status = -ERESTARTSYS;
3604 if (signalled())
3605 break;
3606 } while(status < 0);
1da177e4
LT		 3607 return status;
3608}
3609
888e694c
TM		 3610int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3611{
3612 struct nfs_server *server = NFS_SERVER(state->inode);
3613 struct nfs4_exception exception = { };
3614 int err;
3615
3616 err = nfs4_set_lock_state(state, fl);
3617 if (err != 0)
3618 goto out;
3619 do {
3620 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3621 if (err != -NFS4ERR_DELAY)
3622 break;
3623 err = nfs4_handle_exception(server, err, &exception);
3624 } while (exception.retry);
3625out:
3626 return err;
3627}
6b3b5496 3628
aa1870af
BF		 3629#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3630
6b3b5496
BF		 3631int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3632 size_t buflen, int flags)
3633{
4b580ee3
BF		 3634 struct inode *inode = dentry->d_inode;
3635
3636 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3637 return -EOPNOTSUPP;
3638
3639 if (!S_ISREG(inode->i_mode) &&
3640 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3641 return -EPERM;
3642
3643 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3644}
3645
3646/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3647 * and that's what we'll do for e.g. user attributes that haven't been set.
3648 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3649 * attributes in kernel-managed attribute namespaces. */
3650ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3651 size_t buflen)
3652{
aa1870af
BF		 3653 struct inode *inode = dentry->d_inode;
3654
3655 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3656 return -EOPNOTSUPP;
3657
3658 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3659}
3660
3661ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3662{
aa1870af 3663 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3664
096455a2
BF		 3665 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3666 return 0;
6b3b5496
BF		 3667 if (buf && buflen < len)
3668 return -ERANGE;
3669 if (buf)
aa1870af
BF		 3670 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3671 return len;
6b3b5496
BF		 3672}
3673
683b57b4 3674int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
7aaa0b3b 3675 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3676{
3677 struct nfs_server *server = NFS_SERVER(dir);
3678 u32 bitmask[2] = {
361e624f
MN		 3679 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3680 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3681 };
3682 struct nfs4_fs_locations_arg args = {
3683 .dir_fh = NFS_FH(dir),
3684 .name = &dentry->d_name,
3685 .page = page,
3686 .bitmask = bitmask,
3687 };
3688 struct rpc_message msg = {
3689 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3690 .rpc_argp = &args,
7aaa0b3b 3691 .rpc_resp = fs_locations,
683b57b4
TM		 3692 };
3693 int status;
3694
3695 dprintk("%s: start\n", __FUNCTION__);
3696 fs_locations->fattr.valid = 0;
3697 fs_locations->server = server;
830b8e33 3698 fs_locations->nlocations = 0;
683b57b4
TM		 3699 status = rpc_call_sync(server->client, &msg, 0);
3700 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3701 return status;
3702}
3703
1da177e4
LT		 3704struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3705 .recover_open = nfs4_open_reclaim,
3706 .recover_lock = nfs4_lock_reclaim,
3707};
3708
3709struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3710 .recover_open = nfs4_open_expired,
3711 .recover_lock = nfs4_lock_expired,
3712};
3713
6b3b5496
BF		 3714static struct inode_operations nfs4_file_inode_operations = {
3715 .permission = nfs_permission,
3716 .getattr = nfs_getattr,
3717 .setattr = nfs_setattr,
3718 .getxattr = nfs4_getxattr,
3719 .setxattr = nfs4_setxattr,
3720 .listxattr = nfs4_listxattr,
3721};
3722
509de811 3723const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3724 .version = 4, /* protocol version */
3725 .dentry_ops = &nfs4_dentry_operations,
3726 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3727 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3728 .getroot = nfs4_proc_get_root,
3729 .getattr = nfs4_proc_getattr,
3730 .setattr = nfs4_proc_setattr,
2b3de441 3731 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3732 .lookup = nfs4_proc_lookup,
3733 .access = nfs4_proc_access,
3734 .readlink = nfs4_proc_readlink,
3735 .read = nfs4_proc_read,
3736 .write = nfs4_proc_write,
3737 .commit = nfs4_proc_commit,
3738 .create = nfs4_proc_create,
3739 .remove = nfs4_proc_remove,
3740 .unlink_setup = nfs4_proc_unlink_setup,
3741 .unlink_done = nfs4_proc_unlink_done,
3742 .rename = nfs4_proc_rename,
3743 .link = nfs4_proc_link,
3744 .symlink = nfs4_proc_symlink,
3745 .mkdir = nfs4_proc_mkdir,
3746 .rmdir = nfs4_proc_remove,
3747 .readdir = nfs4_proc_readdir,
3748 .mknod = nfs4_proc_mknod,
3749 .statfs = nfs4_proc_statfs,
3750 .fsinfo = nfs4_proc_fsinfo,
3751 .pathconf = nfs4_proc_pathconf,
e9326dca 3752 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3753 .decode_dirent = nfs4_decode_dirent,
3754 .read_setup = nfs4_proc_read_setup,
ec06c096 3755 .read_done = nfs4_read_done,
1da177e4 3756 .write_setup = nfs4_proc_write_setup,
788e7a89 3757 .write_done = nfs4_write_done,
1da177e4 3758 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3759 .commit_done = nfs4_commit_done,
02a913a7
TM		 3760 .file_open = nfs_open,
3761 .file_release = nfs_release,
1da177e4 3762 .lock = nfs4_proc_lock,
e50a1c2e 3763 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3764};
3765
3766/*
3767 * Local variables:
3768 * c-basic-offset: 8
3769 * End:
3770 */
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