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NFS: Fix Oopsable condition in nfs_readpage_sync()
[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);
58d9714a 67static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_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
LT		 197{
198 struct nfs4_client *clp = server->nfs4_state;
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,
255 p->o_arg.clientid = server->nfs4_state->cl_clientid;
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 */
553 nfs4_schedule_state_recovery(server->nfs4_state);
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))
24ac23ab
TM		 761 return server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
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{
795 struct nfs4_client *clp = server->nfs4_state;
796
797 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
798 nfs4_schedule_state_recovery(clp);
799 return nfs4_wait_clnt_recover(server->client, clp);
800}
801
1da177e4
LT		 802/*
803 * OPEN_EXPIRED:
804 * reclaim state on the server after a network partition.
805 * Assumes caller holds the appropriate lock
806 */
807static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
808{
1da177e4 809 struct inode *inode = state->inode;
1da177e4 810 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
e56e0b78 811 struct nfs4_opendata *opendata;
24ac23ab 812 int openflags = state->state & (FMODE_READ|FMODE_WRITE);
864472e9 813 int ret;
1da177e4
LT		 814
815 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
864472e9
TM		 816 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
817 if (ret < 0)
818 return ret;
1da177e4
LT		 819 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
820 set_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9 821 return 0;
1da177e4 822 }
24ac23ab 823 opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
e56e0b78 824 if (opendata == NULL)
864472e9
TM		 825 return -ENOMEM;
826 ret = nfs4_open_recover(opendata, state);
827 if (ret == -ESTALE) {
828 /* Invalidate the state owner so we don't ever use it again */
829 nfs4_drop_state_owner(sp);
830 d_drop(dentry);
1da177e4 831 }
e56e0b78 832 nfs4_opendata_free(opendata);
864472e9 833 return ret;
1da177e4
LT		 834}
835
202b50dc
TM		 836static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
837{
838 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
839 struct nfs4_exception exception = { };
840 int err;
841
842 do {
843 err = _nfs4_open_expired(sp, state, dentry);
844 if (err == -NFS4ERR_DELAY)
845 nfs4_handle_exception(server, err, &exception);
846 } while (exception.retry);
847 return err;
848}
849
1da177e4
LT		 850static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
851{
1da177e4 852 struct nfs_open_context *ctx;
864472e9 853 int ret;
1da177e4 854
864472e9
TM		 855 ctx = nfs4_state_find_open_context(state);
856 if (IS_ERR(ctx))
857 return PTR_ERR(ctx);
858 ret = nfs4_do_open_expired(sp, state, ctx->dentry);
859 put_nfs_open_context(ctx);
860 return ret;
1da177e4
LT		 861}
862
863/*
24ac23ab 864 * Returns a referenced nfs4_state if there is an open delegation on the file
1da177e4
LT		 865 */
866static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
867{
868 struct nfs_delegation *delegation;
869 struct nfs_server *server = NFS_SERVER(inode);
870 struct nfs4_client *clp = server->nfs4_state;
871 struct nfs_inode *nfsi = NFS_I(inode);
872 struct nfs4_state_owner *sp = NULL;
873 struct nfs4_state *state = NULL;
874 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
875 int err;
876
b4454fe1
TM		 877 err = -ENOMEM;
878 if (!(sp = nfs4_get_state_owner(server, cred))) {
879 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
880 return err;
881 }
58d9714a
TM		 882 err = nfs4_recover_expired_lease(server);
883 if (err != 0)
b4454fe1 884 goto out_put_state_owner;
1da177e4
LT		 885 /* Protect against reboot recovery - NOTE ORDER! */
886 down_read(&clp->cl_sem);
887 /* Protect against delegation recall */
888 down_read(&nfsi->rwsem);
889 delegation = NFS_I(inode)->delegation;
890 err = -ENOENT;
891 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
892 goto out_err;
893 err = -ENOMEM;
1da177e4
LT		 894 state = nfs4_get_open_state(inode, sp);
895 if (state == NULL)
896 goto out_err;
897
898 err = -ENOENT;
899 if ((state->state & open_flags) == open_flags) {
900 spin_lock(&inode->i_lock);
e7616923 901 update_open_stateflags(state, open_flags);
1da177e4
LT		 902 spin_unlock(&inode->i_lock);
903 goto out_ok;
904 } else if (state->state != 0)
b4454fe1 905 goto out_put_open_state;
1da177e4
LT		 906
907 lock_kernel();
908 err = _nfs4_do_access(inode, cred, open_flags);
909 unlock_kernel();
910 if (err != 0)
b4454fe1 911 goto out_put_open_state;
1da177e4
LT		 912 set_bit(NFS_DELEGATED_STATE, &state->flags);
913 update_open_stateid(state, &delegation->stateid, open_flags);
914out_ok:
1da177e4
LT		 915 nfs4_put_state_owner(sp);
916 up_read(&nfsi->rwsem);
917 up_read(&clp->cl_sem);
1da177e4 918 *res = state;
b4454fe1
TM		 919 return 0;
920out_put_open_state:
921 nfs4_put_open_state(state);
1da177e4 922out_err:
1da177e4
LT		 923 up_read(&nfsi->rwsem);
924 up_read(&clp->cl_sem);
b8e5c4c2
TM		 925 if (err != -EACCES)
926 nfs_inode_return_delegation(inode);
b4454fe1
TM		 927out_put_state_owner:
928 nfs4_put_state_owner(sp);
1da177e4
LT		 929 return err;
930}
931
932static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
933{
934 struct nfs4_exception exception = { };
a162a6b8 935 struct nfs4_state *res = ERR_PTR(-EIO);
1da177e4
LT		 936 int err;
937
938 do {
939 err = _nfs4_open_delegated(inode, flags, cred, &res);
940 if (err == 0)
941 break;
942 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
943 err, &exception));
944 } while (exception.retry);
945 return res;
946}
947
948/*
24ac23ab 949 * Returns a referenced nfs4_state
1da177e4
LT		 950 */
951static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
952{
953 struct nfs4_state_owner *sp;
954 struct nfs4_state *state = NULL;
955 struct nfs_server *server = NFS_SERVER(dir);
956 struct nfs4_client *clp = server->nfs4_state;
e56e0b78 957 struct nfs4_opendata *opendata;
1da177e4 958 int status;
1da177e4
LT		 959
960 /* Protect against reboot recovery conflicts */
1da177e4
LT		 961 status = -ENOMEM;
962 if (!(sp = nfs4_get_state_owner(server, cred))) {
963 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
964 goto out_err;
965 }
58d9714a
TM		 966 status = nfs4_recover_expired_lease(server);
967 if (status != 0)
b4454fe1 968 goto err_put_state_owner;
58d9714a
TM		 969 down_read(&clp->cl_sem);
970 status = -ENOMEM;
e56e0b78
TM		 971 opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
972 if (opendata == NULL)
973 goto err_put_state_owner;
1da177e4 974
24ac23ab 975 status = _nfs4_proc_open(opendata);
1da177e4 976 if (status != 0)
e56e0b78 977 goto err_opendata_free;
1da177e4
LT		 978
979 status = -ENOMEM;
24ac23ab
TM		 980 state = nfs4_opendata_to_nfs4_state(opendata);
981 if (state == NULL)
e56e0b78 982 goto err_opendata_free;
e56e0b78 983 if (opendata->o_res.delegation_type != 0)
24ac23ab 984 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
e56e0b78 985 nfs4_opendata_free(opendata);
1da177e4
LT		 986 nfs4_put_state_owner(sp);
987 up_read(&clp->cl_sem);
988 *res = state;
989 return 0;
e56e0b78
TM		 990err_opendata_free:
991 nfs4_opendata_free(opendata);
992err_put_state_owner:
993 nfs4_put_state_owner(sp);
1da177e4 994out_err:
1da177e4
LT		 995 /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
996 up_read(&clp->cl_sem);
1da177e4
LT		 997 *res = NULL;
998 return status;
999}
1000
1001
1002static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1003{
1004 struct nfs4_exception exception = { };
1005 struct nfs4_state *res;
1006 int status;
1007
1008 do {
1009 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1010 if (status == 0)
1011 break;
1012 /* NOTE: BAD_SEQID means the server and client disagree about the
1013 * book-keeping w.r.t. state-changing operations
1014 * (OPEN/CLOSE/LOCK/LOCKU...)
1015 * It is actually a sign of a bug on the client or on the server.
1016 *
1017 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1018 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1019 * have unhashed the old state_owner for us, and that we can
1020 * therefore safely retry using a new one. We should still warn
1021 * the user though...
1022 */
1023 if (status == -NFS4ERR_BAD_SEQID) {
1024 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1025 exception.retry = 1;
1026 continue;
1027 }
550f5747
TM		 1028 /*
1029 * BAD_STATEID on OPEN means that the server cancelled our
1030 * state before it received the OPEN_CONFIRM.
1031 * Recover by retrying the request as per the discussion
1032 * on Page 181 of RFC3530.
1033 */
1034 if (status == -NFS4ERR_BAD_STATEID) {
1035 exception.retry = 1;
1036 continue;
1037 }
1da177e4
LT		 1038 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1039 status, &exception));
1040 } while (exception.retry);
1041 return res;
1042}
1043
3e4f6290
TM		 1044static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1045 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1046{
3e4f6290 1047 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1048 struct nfs_setattrargs arg = {
3e4f6290 1049 .fh = NFS_FH(inode),
1da177e4
LT		 1050 .iap = sattr,
1051 .server = server,
1052 .bitmask = server->attr_bitmask,
1053 };
1054 struct nfs_setattrres res = {
1055 .fattr = fattr,
1056 .server = server,
1057 };
1058 struct rpc_message msg = {
1059 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1060 .rpc_argp = &arg,
1061 .rpc_resp = &res,
1062 };
26e976a8 1063 unsigned long timestamp = jiffies;
65e4308d 1064 int status;
1da177e4 1065
0e574af1 1066 nfs_fattr_init(fattr);
1da177e4 1067
3e4f6290
TM		 1068 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1069 /* Use that stateid */
1070 } else if (state != NULL) {
1da177e4 1071 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1072 nfs4_copy_stateid(&arg.stateid, state, current->files);
1073 } else
1da177e4
LT		 1074 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1075
65e4308d 1076 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1077 if (status == 0 && state != NULL)
1078 renew_lease(server, timestamp);
65e4308d 1079 return status;
1da177e4
LT		 1080}
1081
3e4f6290
TM		 1082static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1083 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1084{
3e4f6290 1085 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1086 struct nfs4_exception exception = { };
1087 int err;
1088 do {
1089 err = nfs4_handle_exception(server,
3e4f6290 1090 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1091 &exception);
1092 } while (exception.retry);
1093 return err;
1094}
1095
1096struct nfs4_closedata {
1097 struct inode *inode;
1098 struct nfs4_state *state;
1099 struct nfs_closeargs arg;
1100 struct nfs_closeres res;
516a6af6 1101 struct nfs_fattr fattr;
26e976a8 1102 unsigned long timestamp;
1da177e4
LT		 1103};
1104
963d8fe5 1105static void nfs4_free_closedata(void *data)
9512135d 1106{
963d8fe5
TM		 1107 struct nfs4_closedata *calldata = data;
1108 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1109
1110 nfs4_put_open_state(calldata->state);
1111 nfs_free_seqid(calldata->arg.seqid);
9512135d 1112 nfs4_put_state_owner(sp);
9512135d
TM		 1113 kfree(calldata);
1114}
1115
963d8fe5 1116static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1117{
963d8fe5 1118 struct nfs4_closedata *calldata = data;
1da177e4 1119 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1120 struct nfs_server *server = NFS_SERVER(calldata->inode);
1121
4ce70ada
TM		 1122 if (RPC_ASSASSINATED(task))
1123 return;
1da177e4
LT		 1124 /* hmm. we are done with the inode, and in the process of freeing
1125 * the state_owner. we keep this around to process errors
1126 */
cee54fc9 1127 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1128 switch (task->tk_status) {
1129 case 0:
1130 memcpy(&state->stateid, &calldata->res.stateid,
1131 sizeof(state->stateid));
26e976a8 1132 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1133 break;
1134 case -NFS4ERR_STALE_STATEID:
1135 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1136 nfs4_schedule_state_recovery(server->nfs4_state);
1137 break;
1138 default:
1139 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1140 rpc_restart_call(task);
1141 return;
1142 }
1143 }
516a6af6 1144 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1145}
1146
4ce70ada 1147static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1148{
4ce70ada 1149 struct nfs4_closedata *calldata = data;
9512135d 1150 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1151 struct rpc_message msg = {
1152 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1153 .rpc_argp = &calldata->arg,
1154 .rpc_resp = &calldata->res,
9512135d 1155 .rpc_cred = state->owner->so_cred,
1da177e4 1156 };
4cecb76f 1157 int mode = 0, old_mode;
9512135d 1158
963d8fe5 1159 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1160 return;
9512135d
TM		 1161 /* Recalculate the new open mode in case someone reopened the file
1162 * while we were waiting in line to be scheduled.
1163 */
4cecb76f
TM		 1164 spin_lock(&state->owner->so_lock);
1165 spin_lock(&calldata->inode->i_lock);
1166 mode = old_mode = state->state;
e7616923
TM		 1167 if (state->n_rdwr == 0) {
1168 if (state->n_rdonly == 0)
1169 mode &= ~FMODE_READ;
1170 if (state->n_wronly == 0)
1171 mode &= ~FMODE_WRITE;
1172 }
4cecb76f
TM		 1173 nfs4_state_set_mode_locked(state, mode);
1174 spin_unlock(&calldata->inode->i_lock);
1175 spin_unlock(&state->owner->so_lock);
1176 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
963d8fe5
TM		 1177 /* Note: exit _without_ calling nfs4_close_done */
1178 task->tk_action = NULL;
9512135d
TM		 1179 return;
1180 }
516a6af6 1181 nfs_fattr_init(calldata->res.fattr);
9512135d 1182 if (mode != 0)
1da177e4 1183 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d 1184 calldata->arg.open_flags = mode;
26e976a8 1185 calldata->timestamp = jiffies;
9512135d 1186 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1187}
1188
963d8fe5 1189static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1190 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1191 .rpc_call_done = nfs4_close_done,
1192 .rpc_release = nfs4_free_closedata,
1193};
1194
1da177e4
LT		 1195/*
1196 * It is possible for data to be read/written from a mem-mapped file
1197 * after the sys_close call (which hits the vfs layer as a flush).
1198 * This means that we can't safely call nfsv4 close on a file until
1199 * the inode is cleared. This in turn means that we are not good
1200 * NFSv4 citizens - we do not indicate to the server to update the file's
1201 * share state even when we are done with one of the three share
1202 * stateid's in the inode.
1203 *
1204 * NOTE: Caller must be holding the sp->so_owner semaphore!
1205 */
4cecb76f 1206int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1da177e4 1207{
516a6af6 1208 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1209 struct nfs4_closedata *calldata;
9512135d 1210 int status = -ENOMEM;
1da177e4 1211
9512135d 1212 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1213 if (calldata == NULL)
9512135d 1214 goto out;
1da177e4
LT		 1215 calldata->inode = inode;
1216 calldata->state = state;
1217 calldata->arg.fh = NFS_FH(inode);
9512135d 1218 calldata->arg.stateid = &state->stateid;
1da177e4 1219 /* Serialization for the sequence id */
cee54fc9 1220 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1221 if (calldata->arg.seqid == NULL)
1222 goto out_free_calldata;
516a6af6
TM		 1223 calldata->arg.bitmask = server->attr_bitmask;
1224 calldata->res.fattr = &calldata->fattr;
1225 calldata->res.server = server;
9512135d 1226
4ce70ada 1227 status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
9512135d
TM		 1228 if (status == 0)
1229 goto out;
1230
1231 nfs_free_seqid(calldata->arg.seqid);
1232out_free_calldata:
1233 kfree(calldata);
1234out:
1235 return status;
1da177e4
LT		 1236}
1237
95cf959b 1238static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
02a913a7
TM		 1239{
1240 struct file *filp;
1241
1242 filp = lookup_instantiate_filp(nd, dentry, NULL);
1243 if (!IS_ERR(filp)) {
1244 struct nfs_open_context *ctx;
1245 ctx = (struct nfs_open_context *)filp->private_data;
1246 ctx->state = state;
95cf959b
TM		 1247 return 0;
1248 }
1249 nfs4_close_state(state, nd->intent.open.flags);
1250 return PTR_ERR(filp);
02a913a7
TM		 1251}
1252
1253struct dentry *
1da177e4
LT		 1254nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1255{
1256 struct iattr attr;
1257 struct rpc_cred *cred;
1258 struct nfs4_state *state;
02a913a7 1259 struct dentry *res;
1da177e4
LT		 1260
1261 if (nd->flags & LOOKUP_CREATE) {
1262 attr.ia_mode = nd->intent.open.create_mode;
1263 attr.ia_valid = ATTR_MODE;
1264 if (!IS_POSIXACL(dir))
1265 attr.ia_mode &= ~current->fs->umask;
1266 } else {
1267 attr.ia_valid = 0;
1268 BUG_ON(nd->intent.open.flags & O_CREAT);
1269 }
1270
1271 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1272 if (IS_ERR(cred))
02a913a7 1273 return (struct dentry *)cred;
1da177e4
LT		 1274 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1275 put_rpccred(cred);
02a913a7
TM		 1276 if (IS_ERR(state)) {
1277 if (PTR_ERR(state) == -ENOENT)
1278 d_add(dentry, NULL);
1279 return (struct dentry *)state;
1280 }
24ac23ab 1281 res = d_add_unique(dentry, igrab(state->inode));
02a913a7
TM		 1282 if (res != NULL)
1283 dentry = res;
1284 nfs4_intent_set_file(nd, dentry, state);
1285 return res;
1da177e4
LT		 1286}
1287
1288int
02a913a7 1289nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4
LT		 1290{
1291 struct rpc_cred *cred;
1292 struct nfs4_state *state;
1da177e4
LT		 1293
1294 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1295 if (IS_ERR(cred))
1296 return PTR_ERR(cred);
1297 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1298 if (IS_ERR(state))
1299 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1300 put_rpccred(cred);
02a913a7
TM		 1301 if (IS_ERR(state)) {
1302 switch (PTR_ERR(state)) {
1303 case -EPERM:
1304 case -EACCES:
1305 case -EDQUOT:
1306 case -ENOSPC:
1307 case -EROFS:
1308 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1309 return 1;
1310 case -ENOENT:
1311 if (dentry->d_inode == NULL)
1312 return 1;
1313 }
1314 goto out_drop;
1315 }
24ac23ab 1316 if (state->inode == dentry->d_inode) {
02a913a7 1317 nfs4_intent_set_file(nd, dentry, state);
1da177e4
LT		 1318 return 1;
1319 }
1da177e4 1320 nfs4_close_state(state, openflags);
02a913a7
TM		 1321out_drop:
1322 d_drop(dentry);
1da177e4
LT		 1323 return 0;
1324}
1325
1326
1327static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1328{
1329 struct nfs4_server_caps_res res = {};
1330 struct rpc_message msg = {
1331 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1332 .rpc_argp = fhandle,
1333 .rpc_resp = &res,
1334 };
1335 int status;
1336
1337 status = rpc_call_sync(server->client, &msg, 0);
1338 if (status == 0) {
1339 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1340 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1341 server->caps |= NFS_CAP_ACLS;
1342 if (res.has_links != 0)
1343 server->caps |= NFS_CAP_HARDLINKS;
1344 if (res.has_symlinks != 0)
1345 server->caps |= NFS_CAP_SYMLINKS;
1346 server->acl_bitmask = res.acl_bitmask;
1347 }
1348 return status;
1349}
1350
55a97593 1351int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1352{
1353 struct nfs4_exception exception = { };
1354 int err;
1355 do {
1356 err = nfs4_handle_exception(server,
1357 _nfs4_server_capabilities(server, fhandle),
1358 &exception);
1359 } while (exception.retry);
1360 return err;
1361}
1362
1363static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1364 struct nfs_fsinfo *info)
1365{
1da177e4
LT		 1366 struct nfs4_lookup_root_arg args = {
1367 .bitmask = nfs4_fattr_bitmap,
1368 };
1369 struct nfs4_lookup_res res = {
1370 .server = server,
0e574af1 1371 .fattr = info->fattr,
1da177e4
LT		 1372 .fh = fhandle,
1373 };
1374 struct rpc_message msg = {
1375 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1376 .rpc_argp = &args,
1377 .rpc_resp = &res,
1378 };
0e574af1 1379 nfs_fattr_init(info->fattr);
1da177e4
LT		 1380 return rpc_call_sync(server->client, &msg, 0);
1381}
1382
1383static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1384 struct nfs_fsinfo *info)
1385{
1386 struct nfs4_exception exception = { };
1387 int err;
1388 do {
1389 err = nfs4_handle_exception(server,
1390 _nfs4_lookup_root(server, fhandle, info),
1391 &exception);
1392 } while (exception.retry);
1393 return err;
1394}
1395
1396static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1397 struct nfs_fsinfo *info)
1398{
1399 struct nfs_fattr * fattr = info->fattr;
1400 unsigned char * p;
1401 struct qstr q;
1402 struct nfs4_lookup_arg args = {
1403 .dir_fh = fhandle,
1404 .name = &q,
1405 .bitmask = nfs4_fattr_bitmap,
1406 };
1407 struct nfs4_lookup_res res = {
1408 .server = server,
1409 .fattr = fattr,
1410 .fh = fhandle,
1411 };
1412 struct rpc_message msg = {
1413 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1414 .rpc_argp = &args,
1415 .rpc_resp = &res,
1416 };
1417 int status;
1418
1419 /*
1420 * Now we do a separate LOOKUP for each component of the mount path.
1421 * The LOOKUPs are done separately so that we can conveniently
1422 * catch an ERR_WRONGSEC if it occurs along the way...
1423 */
1424 status = nfs4_lookup_root(server, fhandle, info);
1425 if (status)
1426 goto out;
1427
1428 p = server->mnt_path;
1429 for (;;) {
1430 struct nfs4_exception exception = { };
1431
1432 while (*p == '/')
1433 p++;
1434 if (!*p)
1435 break;
1436 q.name = p;
1437 while (*p && (*p != '/'))
1438 p++;
1439 q.len = p - q.name;
1440
1441 do {
0e574af1 1442 nfs_fattr_init(fattr);
1da177e4
LT		 1443 status = nfs4_handle_exception(server,
1444 rpc_call_sync(server->client, &msg, 0),
1445 &exception);
1446 } while (exception.retry);
1447 if (status == 0)
1448 continue;
1449 if (status == -ENOENT) {
1450 printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1451 printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1452 }
1453 break;
1454 }
1455 if (status == 0)
1456 status = nfs4_server_capabilities(server, fhandle);
1457 if (status == 0)
1458 status = nfs4_do_fsinfo(server, fhandle, info);
1459out:
c12e87f4 1460 return nfs4_map_errors(status);
1da177e4
LT		 1461}
1462
6b97fd3d
MN		 1463/*
1464 * Get locations and (maybe) other attributes of a referral.
1465 * Note that we'll actually follow the referral later when
1466 * we detect fsid mismatch in inode revalidation
1467 */
1468static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1469{
1470 int status = -ENOMEM;
1471 struct page *page = NULL;
1472 struct nfs4_fs_locations *locations = NULL;
1473 struct dentry dentry = {};
1474
1475 page = alloc_page(GFP_KERNEL);
1476 if (page == NULL)
1477 goto out;
1478 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1479 if (locations == NULL)
1480 goto out;
1481
1482 dentry.d_name.name = name->name;
1483 dentry.d_name.len = name->len;
1484 status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1485 if (status != 0)
1486 goto out;
1487 /* Make sure server returned a different fsid for the referral */
1488 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1489 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1490 status = -EIO;
1491 goto out;
1492 }
1493
1494 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1495 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1496 if (!fattr->mode)
1497 fattr->mode = S_IFDIR;
1498 memset(fhandle, 0, sizeof(struct nfs_fh));
1499out:
1500 if (page)
1501 __free_page(page);
1502 if (locations)
1503 kfree(locations);
1504 return status;
1505}
1506
1da177e4
LT		 1507static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1508{
1509 struct nfs4_getattr_arg args = {
1510 .fh = fhandle,
1511 .bitmask = server->attr_bitmask,
1512 };
1513 struct nfs4_getattr_res res = {
1514 .fattr = fattr,
1515 .server = server,
1516 };
1517 struct rpc_message msg = {
1518 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1519 .rpc_argp = &args,
1520 .rpc_resp = &res,
1521 };
1522
0e574af1 1523 nfs_fattr_init(fattr);
1da177e4
LT		 1524 return rpc_call_sync(server->client, &msg, 0);
1525}
1526
1527static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1528{
1529 struct nfs4_exception exception = { };
1530 int err;
1531 do {
1532 err = nfs4_handle_exception(server,
1533 _nfs4_proc_getattr(server, fhandle, fattr),
1534 &exception);
1535 } while (exception.retry);
1536 return err;
1537}
1538
1539/*
1540 * The file is not closed if it is opened due to the a request to change
1541 * the size of the file. The open call will not be needed once the
1542 * VFS layer lookup-intents are implemented.
1543 *
1544 * Close is called when the inode is destroyed.
1545 * If we haven't opened the file for O_WRONLY, we
1546 * need to in the size_change case to obtain a stateid.
1547 *
1548 * Got race?
1549 * Because OPEN is always done by name in nfsv4, it is
1550 * possible that we opened a different file by the same
1551 * name. We can recognize this race condition, but we
1552 * can't do anything about it besides returning an error.
1553 *
1554 * This will be fixed with VFS changes (lookup-intent).
1555 */
1556static int
1557nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1558 struct iattr *sattr)
1559{
08e9eac4
TM		 1560 struct rpc_cred *cred;
1561 struct inode *inode = dentry->d_inode;
d530838b
TM		 1562 struct nfs_open_context *ctx;
1563 struct nfs4_state *state = NULL;
1da177e4
LT		 1564 int status;
1565
0e574af1 1566 nfs_fattr_init(fattr);
1da177e4 1567
08e9eac4
TM		 1568 cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1569 if (IS_ERR(cred))
1570 return PTR_ERR(cred);
d530838b
TM		 1571
1572 /* Search for an existing open(O_WRITE) file */
1573 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1574 if (ctx != NULL)
1575 state = ctx->state;
08e9eac4 1576
3e4f6290 1577 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1578 if (status == 0)
1579 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1580 if (ctx != NULL)
1581 put_nfs_open_context(ctx);
08e9eac4 1582 put_rpccred(cred);
1da177e4
LT		 1583 return status;
1584}
1585
1586static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1587 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1588{
1589 int status;
1590 struct nfs_server *server = NFS_SERVER(dir);
1591 struct nfs4_lookup_arg args = {
1592 .bitmask = server->attr_bitmask,
1593 .dir_fh = NFS_FH(dir),
1594 .name = name,
1595 };
1596 struct nfs4_lookup_res res = {
1597 .server = server,
1598 .fattr = fattr,
1599 .fh = fhandle,
1600 };
1601 struct rpc_message msg = {
1602 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1603 .rpc_argp = &args,
1604 .rpc_resp = &res,
1605 };
1606
0e574af1 1607 nfs_fattr_init(fattr);
1da177e4
LT		 1608
1609 dprintk("NFS call lookup %s\n", name->name);
1610 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
6b97fd3d
MN		 1611 if (status == -NFS4ERR_MOVED)
1612 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1613 dprintk("NFS reply lookup: %d\n", status);
1614 return status;
1615}
1616
1617static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1618{
1619 struct nfs4_exception exception = { };
1620 int err;
1621 do {
1622 err = nfs4_handle_exception(NFS_SERVER(dir),
1623 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1624 &exception);
1625 } while (exception.retry);
1626 return err;
1627}
1628
1629static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1630{
1631 struct nfs4_accessargs args = {
1632 .fh = NFS_FH(inode),
1633 };
1634 struct nfs4_accessres res = { 0 };
1635 struct rpc_message msg = {
1636 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1637 .rpc_argp = &args,
1638 .rpc_resp = &res,
1639 .rpc_cred = entry->cred,
1640 };
1641 int mode = entry->mask;
1642 int status;
1643
1644 /*
1645 * Determine which access bits we want to ask for...
1646 */
1647 if (mode & MAY_READ)
1648 args.access |= NFS4_ACCESS_READ;
1649 if (S_ISDIR(inode->i_mode)) {
1650 if (mode & MAY_WRITE)
1651 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1652 if (mode & MAY_EXEC)
1653 args.access |= NFS4_ACCESS_LOOKUP;
1654 } else {
1655 if (mode & MAY_WRITE)
1656 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1657 if (mode & MAY_EXEC)
1658 args.access |= NFS4_ACCESS_EXECUTE;
1659 }
1660 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1661 if (!status) {
1662 entry->mask = 0;
1663 if (res.access & NFS4_ACCESS_READ)
1664 entry->mask |= MAY_READ;
1665 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1666 entry->mask |= MAY_WRITE;
1667 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1668 entry->mask |= MAY_EXEC;
1669 }
1670 return status;
1671}
1672
1673static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1674{
1675 struct nfs4_exception exception = { };
1676 int err;
1677 do {
1678 err = nfs4_handle_exception(NFS_SERVER(inode),
1679 _nfs4_proc_access(inode, entry),
1680 &exception);
1681 } while (exception.retry);
1682 return err;
1683}
1684
1685/*
1686 * TODO: For the time being, we don't try to get any attributes
1687 * along with any of the zero-copy operations READ, READDIR,
1688 * READLINK, WRITE.
1689 *
1690 * In the case of the first three, we want to put the GETATTR
1691 * after the read-type operation -- this is because it is hard
1692 * to predict the length of a GETATTR response in v4, and thus
1693 * align the READ data correctly. This means that the GETATTR
1694 * may end up partially falling into the page cache, and we should
1695 * shift it into the 'tail' of the xdr_buf before processing.
1696 * To do this efficiently, we need to know the total length
1697 * of data received, which doesn't seem to be available outside
1698 * of the RPC layer.
1699 *
1700 * In the case of WRITE, we also want to put the GETATTR after
1701 * the operation -- in this case because we want to make sure
1702 * we get the post-operation mtime and size. This means that
1703 * we can't use xdr_encode_pages() as written: we need a variant
1704 * of it which would leave room in the 'tail' iovec.
1705 *
1706 * Both of these changes to the XDR layer would in fact be quite
1707 * minor, but I decided to leave them for a subsequent patch.
1708 */
1709static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1710 unsigned int pgbase, unsigned int pglen)
1711{
1712 struct nfs4_readlink args = {
1713 .fh = NFS_FH(inode),
1714 .pgbase = pgbase,
1715 .pglen = pglen,
1716 .pages = &page,
1717 };
1718 struct rpc_message msg = {
1719 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1720 .rpc_argp = &args,
1721 .rpc_resp = NULL,
1722 };
1723
1724 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1725}
1726
1727static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1728 unsigned int pgbase, unsigned int pglen)
1729{
1730 struct nfs4_exception exception = { };
1731 int err;
1732 do {
1733 err = nfs4_handle_exception(NFS_SERVER(inode),
1734 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1735 &exception);
1736 } while (exception.retry);
1737 return err;
1738}
1739
1740static int _nfs4_proc_read(struct nfs_read_data *rdata)
1741{
1742 int flags = rdata->flags;
1743 struct inode *inode = rdata->inode;
1744 struct nfs_fattr *fattr = rdata->res.fattr;
1745 struct nfs_server *server = NFS_SERVER(inode);
1746 struct rpc_message msg = {
1747 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1748 .rpc_argp = &rdata->args,
1749 .rpc_resp = &rdata->res,
1750 .rpc_cred = rdata->cred,
1751 };
1752 unsigned long timestamp = jiffies;
1753 int status;
1754
1755 dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
1756 (long long) rdata->args.offset);
1757
0e574af1 1758 nfs_fattr_init(fattr);
1da177e4
LT		 1759 status = rpc_call_sync(server->client, &msg, flags);
1760 if (!status)
1761 renew_lease(server, timestamp);
1762 dprintk("NFS reply read: %d\n", status);
1763 return status;
1764}
1765
1766static int nfs4_proc_read(struct nfs_read_data *rdata)
1767{
1768 struct nfs4_exception exception = { };
1769 int err;
1770 do {
1771 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1772 _nfs4_proc_read(rdata),
1773 &exception);
1774 } while (exception.retry);
1775 return err;
1776}
1777
1778static int _nfs4_proc_write(struct nfs_write_data *wdata)
1779{
1780 int rpcflags = wdata->flags;
1781 struct inode *inode = wdata->inode;
1782 struct nfs_fattr *fattr = wdata->res.fattr;
1783 struct nfs_server *server = NFS_SERVER(inode);
1784 struct rpc_message msg = {
1785 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1786 .rpc_argp = &wdata->args,
1787 .rpc_resp = &wdata->res,
1788 .rpc_cred = wdata->cred,
1789 };
1790 int status;
1791
1792 dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
1793 (long long) wdata->args.offset);
1794
3b6efee9
TM		 1795 wdata->args.bitmask = server->attr_bitmask;
1796 wdata->res.server = server;
26e976a8 1797 wdata->timestamp = jiffies;
0e574af1 1798 nfs_fattr_init(fattr);
1da177e4
LT		 1799 status = rpc_call_sync(server->client, &msg, rpcflags);
1800 dprintk("NFS reply write: %d\n", status);
3b6efee9
TM		 1801 if (status < 0)
1802 return status;
26e976a8 1803 renew_lease(server, wdata->timestamp);
3b6efee9
TM		 1804 nfs_post_op_update_inode(inode, fattr);
1805 return wdata->res.count;
1da177e4
LT		 1806}
1807
1808static int nfs4_proc_write(struct nfs_write_data *wdata)
1809{
1810 struct nfs4_exception exception = { };
1811 int err;
1812 do {
1813 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1814 _nfs4_proc_write(wdata),
1815 &exception);
1816 } while (exception.retry);
1817 return err;
1818}
1819
1820static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1821{
1822 struct inode *inode = cdata->inode;
1823 struct nfs_fattr *fattr = cdata->res.fattr;
1824 struct nfs_server *server = NFS_SERVER(inode);
1825 struct rpc_message msg = {
1826 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1827 .rpc_argp = &cdata->args,
1828 .rpc_resp = &cdata->res,
1829 .rpc_cred = cdata->cred,
1830 };
1831 int status;
1832
1833 dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
1834 (long long) cdata->args.offset);
1835
3b6efee9
TM		 1836 cdata->args.bitmask = server->attr_bitmask;
1837 cdata->res.server = server;
26e976a8 1838 cdata->timestamp = jiffies;
0e574af1 1839 nfs_fattr_init(fattr);
1da177e4 1840 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1841 if (status >= 0)
1842 renew_lease(server, cdata->timestamp);
1da177e4 1843 dprintk("NFS reply commit: %d\n", status);
3b6efee9
TM		 1844 if (status >= 0)
1845 nfs_post_op_update_inode(inode, fattr);
1da177e4
LT		 1846 return status;
1847}
1848
1849static int nfs4_proc_commit(struct nfs_write_data *cdata)
1850{
1851 struct nfs4_exception exception = { };
1852 int err;
1853 do {
1854 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1855 _nfs4_proc_commit(cdata),
1856 &exception);
1857 } while (exception.retry);
1858 return err;
1859}
1860
1861/*
1862 * Got race?
1863 * We will need to arrange for the VFS layer to provide an atomic open.
1864 * Until then, this create/open method is prone to inefficiency and race
1865 * conditions due to the lookup, create, and open VFS calls from sys_open()
1866 * placed on the wire.
1867 *
1868 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1869 * The file will be opened again in the subsequent VFS open call
1870 * (nfs4_proc_file_open).
1871 *
1872 * The open for read will just hang around to be used by any process that
1873 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1874 */
1875
1876static int
1877nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1878 int flags, struct nameidata *nd)
1da177e4
LT		 1879{
1880 struct nfs4_state *state;
1881 struct rpc_cred *cred;
1882 int status = 0;
1883
1884 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1885 if (IS_ERR(cred)) {
1886 status = PTR_ERR(cred);
1887 goto out;
1888 }
1889 state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1890 put_rpccred(cred);
1891 if (IS_ERR(state)) {
1892 status = PTR_ERR(state);
1893 goto out;
1894 }
24ac23ab 1895 d_instantiate(dentry, igrab(state->inode));
1da177e4
LT		 1896 if (flags & O_EXCL) {
1897 struct nfs_fattr fattr;
3e4f6290 1898 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1899 if (status == 0)
65e4308d 1900 nfs_setattr_update_inode(state->inode, sattr);
02a913a7
TM		 1901 }
1902 if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
95cf959b 1903 status = nfs4_intent_set_file(nd, dentry, state);
02a913a7
TM		 1904 else
1905 nfs4_close_state(state, flags);
1da177e4
LT		 1906out:
1907 return status;
1908}
1909
1910static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1911{
16e42959 1912 struct nfs_server *server = NFS_SERVER(dir);
1da177e4
LT		 1913 struct nfs4_remove_arg args = {
1914 .fh = NFS_FH(dir),
1915 .name = name,
16e42959
TM		 1916 .bitmask = server->attr_bitmask,
1917 };
1918 struct nfs_fattr dir_attr;
1919 struct nfs4_remove_res res = {
1920 .server = server,
1921 .dir_attr = &dir_attr,
1da177e4 1922 };
1da177e4
LT		 1923 struct rpc_message msg = {
1924 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1925 .rpc_argp = &args,
1926 .rpc_resp = &res,
1927 };
1928 int status;
1929
16e42959
TM		 1930 nfs_fattr_init(res.dir_attr);
1931 status = rpc_call_sync(server->client, &msg, 0);
1932 if (status == 0) {
1933 update_changeattr(dir, &res.cinfo);
1934 nfs_post_op_update_inode(dir, res.dir_attr);
1935 }
1da177e4
LT		 1936 return status;
1937}
1938
1939static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1940{
1941 struct nfs4_exception exception = { };
1942 int err;
1943 do {
1944 err = nfs4_handle_exception(NFS_SERVER(dir),
1945 _nfs4_proc_remove(dir, name),
1946 &exception);
1947 } while (exception.retry);
1948 return err;
1949}
1950
1951struct unlink_desc {
1952 struct nfs4_remove_arg args;
16e42959
TM		 1953 struct nfs4_remove_res res;
1954 struct nfs_fattr dir_attr;
1da177e4
LT		 1955};
1956
1957static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1958 struct qstr *name)
1959{
16e42959 1960 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1da177e4
LT		 1961 struct unlink_desc *up;
1962
1963 up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1964 if (!up)
1965 return -ENOMEM;
1966
1967 up->args.fh = NFS_FH(dir->d_inode);
1968 up->args.name = name;
16e42959
TM		 1969 up->args.bitmask = server->attr_bitmask;
1970 up->res.server = server;
1971 up->res.dir_attr = &up->dir_attr;
1da177e4
LT		 1972
1973 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1974 msg->rpc_argp = &up->args;
1975 msg->rpc_resp = &up->res;
1976 return 0;
1977}
1978
1979static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1980{
1981 struct rpc_message *msg = &task->tk_msg;
1982 struct unlink_desc *up;
1983
1984 if (msg->rpc_resp != NULL) {
1985 up = container_of(msg->rpc_resp, struct unlink_desc, res);
16e42959
TM		 1986 update_changeattr(dir->d_inode, &up->res.cinfo);
1987 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1da177e4
LT		 1988 kfree(up);
1989 msg->rpc_resp = NULL;
1990 msg->rpc_argp = NULL;
1991 }
1992 return 0;
1993}
1994
1995static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1996 struct inode *new_dir, struct qstr *new_name)
1997{
6caf2c82 1998 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1999 struct nfs4_rename_arg arg = {
2000 .old_dir = NFS_FH(old_dir),
2001 .new_dir = NFS_FH(new_dir),
2002 .old_name = old_name,
2003 .new_name = new_name,
6caf2c82
TM		 2004 .bitmask = server->attr_bitmask,
2005 };
2006 struct nfs_fattr old_fattr, new_fattr;
2007 struct nfs4_rename_res res = {
2008 .server = server,
2009 .old_fattr = &old_fattr,
2010 .new_fattr = &new_fattr,
1da177e4 2011 };
1da177e4
LT		 2012 struct rpc_message msg = {
2013 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2014 .rpc_argp = &arg,
2015 .rpc_resp = &res,
2016 };
2017 int status;
2018
6caf2c82
TM		 2019 nfs_fattr_init(res.old_fattr);
2020 nfs_fattr_init(res.new_fattr);
2021 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 2022
2023 if (!status) {
2024 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 2025 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 2026 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 2027 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 2028 }
2029 return status;
2030}
2031
2032static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2033 struct inode *new_dir, struct qstr *new_name)
2034{
2035 struct nfs4_exception exception = { };
2036 int err;
2037 do {
2038 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2039 _nfs4_proc_rename(old_dir, old_name,
2040 new_dir, new_name),
2041 &exception);
2042 } while (exception.retry);
2043 return err;
2044}
2045
2046static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2047{
91ba2eee 2048 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2049 struct nfs4_link_arg arg = {
2050 .fh = NFS_FH(inode),
2051 .dir_fh = NFS_FH(dir),
2052 .name = name,
91ba2eee
TM		 2053 .bitmask = server->attr_bitmask,
2054 };
2055 struct nfs_fattr fattr, dir_attr;
2056 struct nfs4_link_res res = {
2057 .server = server,
2058 .fattr = &fattr,
2059 .dir_attr = &dir_attr,
1da177e4 2060 };
1da177e4
LT		 2061 struct rpc_message msg = {
2062 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2063 .rpc_argp = &arg,
91ba2eee 2064 .rpc_resp = &res,
1da177e4
LT		 2065 };
2066 int status;
2067
91ba2eee
TM		 2068 nfs_fattr_init(res.fattr);
2069 nfs_fattr_init(res.dir_attr);
2070 status = rpc_call_sync(server->client, &msg, 0);
2071 if (!status) {
2072 update_changeattr(dir, &res.cinfo);
2073 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 2074 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 2075 }
1da177e4
LT		 2076
2077 return status;
2078}
2079
2080static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2081{
2082 struct nfs4_exception exception = { };
2083 int err;
2084 do {
2085 err = nfs4_handle_exception(NFS_SERVER(inode),
2086 _nfs4_proc_link(inode, dir, name),
2087 &exception);
2088 } while (exception.retry);
2089 return err;
2090}
2091
2092static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2093 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2094 struct nfs_fattr *fattr)
2095{
2096 struct nfs_server *server = NFS_SERVER(dir);
56ae19f3 2097 struct nfs_fattr dir_fattr;
1da177e4
LT		 2098 struct nfs4_create_arg arg = {
2099 .dir_fh = NFS_FH(dir),
2100 .server = server,
2101 .name = name,
2102 .attrs = sattr,
2103 .ftype = NF4LNK,
2104 .bitmask = server->attr_bitmask,
2105 };
2106 struct nfs4_create_res res = {
2107 .server = server,
2108 .fh = fhandle,
2109 .fattr = fattr,
56ae19f3 2110 .dir_fattr = &dir_fattr,
1da177e4
LT		 2111 };
2112 struct rpc_message msg = {
2113 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2114 .rpc_argp = &arg,
2115 .rpc_resp = &res,
2116 };
2117 int status;
2118
2119 if (path->len > NFS4_MAXPATHLEN)
2120 return -ENAMETOOLONG;
2121 arg.u.symlink = path;
0e574af1 2122 nfs_fattr_init(fattr);
56ae19f3 2123 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2124
2125 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2126 if (!status)
2127 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2128 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2129 return status;
2130}
2131
2132static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2133 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2134 struct nfs_fattr *fattr)
2135{
2136 struct nfs4_exception exception = { };
2137 int err;
2138 do {
2139 err = nfs4_handle_exception(NFS_SERVER(dir),
2140 _nfs4_proc_symlink(dir, name, path, sattr,
2141 fhandle, fattr),
2142 &exception);
2143 } while (exception.retry);
2144 return err;
2145}
2146
2147static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2148 struct iattr *sattr)
2149{
2150 struct nfs_server *server = NFS_SERVER(dir);
2151 struct nfs_fh fhandle;
56ae19f3 2152 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2153 struct nfs4_create_arg arg = {
2154 .dir_fh = NFS_FH(dir),
2155 .server = server,
2156 .name = &dentry->d_name,
2157 .attrs = sattr,
2158 .ftype = NF4DIR,
2159 .bitmask = server->attr_bitmask,
2160 };
2161 struct nfs4_create_res res = {
2162 .server = server,
2163 .fh = &fhandle,
2164 .fattr = &fattr,
56ae19f3 2165 .dir_fattr = &dir_fattr,
1da177e4
LT		 2166 };
2167 struct rpc_message msg = {
2168 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2169 .rpc_argp = &arg,
2170 .rpc_resp = &res,
2171 };
2172 int status;
2173
0e574af1 2174 nfs_fattr_init(&fattr);
56ae19f3 2175 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2176
2177 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2178 if (!status) {
2179 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2180 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2181 status = nfs_instantiate(dentry, &fhandle, &fattr);
2182 }
2183 return status;
2184}
2185
2186static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2187 struct iattr *sattr)
2188{
2189 struct nfs4_exception exception = { };
2190 int err;
2191 do {
2192 err = nfs4_handle_exception(NFS_SERVER(dir),
2193 _nfs4_proc_mkdir(dir, dentry, sattr),
2194 &exception);
2195 } while (exception.retry);
2196 return err;
2197}
2198
2199static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2200 u64 cookie, struct page *page, unsigned int count, int plus)
2201{
2202 struct inode *dir = dentry->d_inode;
2203 struct nfs4_readdir_arg args = {
2204 .fh = NFS_FH(dir),
2205 .pages = &page,
2206 .pgbase = 0,
2207 .count = count,
2208 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2209 };
2210 struct nfs4_readdir_res res;
2211 struct rpc_message msg = {
2212 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2213 .rpc_argp = &args,
2214 .rpc_resp = &res,
2215 .rpc_cred = cred,
2216 };
2217 int status;
2218
eadf4598
TM		 2219 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2220 dentry->d_parent->d_name.name,
2221 dentry->d_name.name,
2222 (unsigned long long)cookie);
1da177e4
LT		 2223 lock_kernel();
2224 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2225 res.pgbase = args.pgbase;
2226 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2227 if (status == 0)
2228 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2229 unlock_kernel();
eadf4598 2230 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2231 return status;
2232}
2233
2234static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2235 u64 cookie, struct page *page, unsigned int count, int plus)
2236{
2237 struct nfs4_exception exception = { };
2238 int err;
2239 do {
2240 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2241 _nfs4_proc_readdir(dentry, cred, cookie,
2242 page, count, plus),
2243 &exception);
2244 } while (exception.retry);
2245 return err;
2246}
2247
2248static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2249 struct iattr *sattr, dev_t rdev)
2250{
2251 struct nfs_server *server = NFS_SERVER(dir);
2252 struct nfs_fh fh;
56ae19f3 2253 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2254 struct nfs4_create_arg arg = {
2255 .dir_fh = NFS_FH(dir),
2256 .server = server,
2257 .name = &dentry->d_name,
2258 .attrs = sattr,
2259 .bitmask = server->attr_bitmask,
2260 };
2261 struct nfs4_create_res res = {
2262 .server = server,
2263 .fh = &fh,
2264 .fattr = &fattr,
56ae19f3 2265 .dir_fattr = &dir_fattr,
1da177e4
LT		 2266 };
2267 struct rpc_message msg = {
2268 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2269 .rpc_argp = &arg,
2270 .rpc_resp = &res,
2271 };
2272 int status;
2273 int mode = sattr->ia_mode;
2274
0e574af1 2275 nfs_fattr_init(&fattr);
56ae19f3 2276 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2277
2278 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2279 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2280 if (S_ISFIFO(mode))
2281 arg.ftype = NF4FIFO;
2282 else if (S_ISBLK(mode)) {
2283 arg.ftype = NF4BLK;
2284 arg.u.device.specdata1 = MAJOR(rdev);
2285 arg.u.device.specdata2 = MINOR(rdev);
2286 }
2287 else if (S_ISCHR(mode)) {
2288 arg.ftype = NF4CHR;
2289 arg.u.device.specdata1 = MAJOR(rdev);
2290 arg.u.device.specdata2 = MINOR(rdev);
2291 }
2292 else
2293 arg.ftype = NF4SOCK;
2294
2295 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2296 if (status == 0) {
2297 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2298 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2299 status = nfs_instantiate(dentry, &fh, &fattr);
2300 }
2301 return status;
2302}
2303
2304static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2305 struct iattr *sattr, dev_t rdev)
2306{
2307 struct nfs4_exception exception = { };
2308 int err;
2309 do {
2310 err = nfs4_handle_exception(NFS_SERVER(dir),
2311 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2312 &exception);
2313 } while (exception.retry);
2314 return err;
2315}
2316
2317static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2318 struct nfs_fsstat *fsstat)
2319{
2320 struct nfs4_statfs_arg args = {
2321 .fh = fhandle,
2322 .bitmask = server->attr_bitmask,
2323 };
2324 struct rpc_message msg = {
2325 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2326 .rpc_argp = &args,
2327 .rpc_resp = fsstat,
2328 };
2329
0e574af1 2330 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2331 return rpc_call_sync(server->client, &msg, 0);
2332}
2333
2334static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2335{
2336 struct nfs4_exception exception = { };
2337 int err;
2338 do {
2339 err = nfs4_handle_exception(server,
2340 _nfs4_proc_statfs(server, fhandle, fsstat),
2341 &exception);
2342 } while (exception.retry);
2343 return err;
2344}
2345
2346static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2347 struct nfs_fsinfo *fsinfo)
2348{
2349 struct nfs4_fsinfo_arg args = {
2350 .fh = fhandle,
2351 .bitmask = server->attr_bitmask,
2352 };
2353 struct rpc_message msg = {
2354 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2355 .rpc_argp = &args,
2356 .rpc_resp = fsinfo,
2357 };
2358
2359 return rpc_call_sync(server->client, &msg, 0);
2360}
2361
2362static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2363{
2364 struct nfs4_exception exception = { };
2365 int err;
2366
2367 do {
2368 err = nfs4_handle_exception(server,
2369 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2370 &exception);
2371 } while (exception.retry);
2372 return err;
2373}
2374
2375static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2376{
0e574af1 2377 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2378 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2379}
2380
2381static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2382 struct nfs_pathconf *pathconf)
2383{
2384 struct nfs4_pathconf_arg args = {
2385 .fh = fhandle,
2386 .bitmask = server->attr_bitmask,
2387 };
2388 struct rpc_message msg = {
2389 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2390 .rpc_argp = &args,
2391 .rpc_resp = pathconf,
2392 };
2393
2394 /* None of the pathconf attributes are mandatory to implement */
2395 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2396 memset(pathconf, 0, sizeof(*pathconf));
2397 return 0;
2398 }
2399
0e574af1 2400 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2401 return rpc_call_sync(server->client, &msg, 0);
2402}
2403
2404static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2405 struct nfs_pathconf *pathconf)
2406{
2407 struct nfs4_exception exception = { };
2408 int err;
2409
2410 do {
2411 err = nfs4_handle_exception(server,
2412 _nfs4_proc_pathconf(server, fhandle, pathconf),
2413 &exception);
2414 } while (exception.retry);
2415 return err;
2416}
2417
ec06c096 2418static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2419{
ec06c096 2420 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2421
ec06c096 2422 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2423 rpc_restart_call(task);
ec06c096 2424 return -EAGAIN;
1da177e4
LT		 2425 }
2426 if (task->tk_status > 0)
ec06c096
TM		 2427 renew_lease(server, data->timestamp);
2428 return 0;
1da177e4
LT		 2429}
2430
ec06c096 2431static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2432{
1da177e4
LT		 2433 struct rpc_message msg = {
2434 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2435 .rpc_argp = &data->args,
2436 .rpc_resp = &data->res,
2437 .rpc_cred = data->cred,
2438 };
1da177e4
LT		 2439
2440 data->timestamp = jiffies;
2441
ec06c096 2442 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2443}
2444
788e7a89 2445static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2446{
1da177e4
LT		 2447 struct inode *inode = data->inode;
2448
2449 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2450 rpc_restart_call(task);
788e7a89 2451 return -EAGAIN;
1da177e4 2452 }
4f9838c7 2453 if (task->tk_status >= 0) {
1da177e4 2454 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2455 nfs_post_op_update_inode(inode, data->res.fattr);
2456 }
788e7a89 2457 return 0;
1da177e4
LT		 2458}
2459
788e7a89 2460static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2461{
1da177e4
LT		 2462 struct rpc_message msg = {
2463 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2464 .rpc_argp = &data->args,
2465 .rpc_resp = &data->res,
2466 .rpc_cred = data->cred,
2467 };
2468 struct inode *inode = data->inode;
4f9838c7 2469 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2470 int stable;
1da177e4
LT		 2471
2472 if (how & FLUSH_STABLE) {
2473 if (!NFS_I(inode)->ncommit)
2474 stable = NFS_FILE_SYNC;
2475 else
2476 stable = NFS_DATA_SYNC;
2477 } else
2478 stable = NFS_UNSTABLE;
2479 data->args.stable = stable;
4f9838c7
TM		 2480 data->args.bitmask = server->attr_bitmask;
2481 data->res.server = server;
1da177e4
LT		 2482
2483 data->timestamp = jiffies;
2484
1da177e4 2485 /* Finalize the task. */
788e7a89 2486 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2487}
2488
788e7a89 2489static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2490{
1da177e4
LT		 2491 struct inode *inode = data->inode;
2492
2493 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2494 rpc_restart_call(task);
788e7a89 2495 return -EAGAIN;
1da177e4 2496 }
4f9838c7
TM		 2497 if (task->tk_status >= 0)
2498 nfs_post_op_update_inode(inode, data->res.fattr);
788e7a89 2499 return 0;
1da177e4
LT		 2500}
2501
788e7a89 2502static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2503{
1da177e4
LT		 2504 struct rpc_message msg = {
2505 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2506 .rpc_argp = &data->args,
2507 .rpc_resp = &data->res,
2508 .rpc_cred = data->cred,
2509 };
788e7a89 2510 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2511
4f9838c7
TM		 2512 data->args.bitmask = server->attr_bitmask;
2513 data->res.server = server;
2514
788e7a89 2515 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2516}
2517
2518/*
2519 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2520 * standalone procedure for queueing an asynchronous RENEW.
2521 */
963d8fe5 2522static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4
LT		 2523{
2524 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
963d8fe5 2525 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2526
2527 if (task->tk_status < 0) {
2528 switch (task->tk_status) {
2529 case -NFS4ERR_STALE_CLIENTID:
2530 case -NFS4ERR_EXPIRED:
2531 case -NFS4ERR_CB_PATH_DOWN:
2532 nfs4_schedule_state_recovery(clp);
2533 }
2534 return;
2535 }
2536 spin_lock(&clp->cl_lock);
2537 if (time_before(clp->cl_last_renewal,timestamp))
2538 clp->cl_last_renewal = timestamp;
2539 spin_unlock(&clp->cl_lock);
2540}
2541
963d8fe5
TM		 2542static const struct rpc_call_ops nfs4_renew_ops = {
2543 .rpc_call_done = nfs4_renew_done,
2544};
2545
b4454fe1 2546int nfs4_proc_async_renew(struct nfs4_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2547{
2548 struct rpc_message msg = {
2549 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2550 .rpc_argp = clp,
b4454fe1 2551 .rpc_cred = cred,
1da177e4
LT		 2552 };
2553
2554 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2555 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2556}
2557
b4454fe1 2558int nfs4_proc_renew(struct nfs4_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2559{
2560 struct rpc_message msg = {
2561 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2562 .rpc_argp = clp,
b4454fe1 2563 .rpc_cred = cred,
1da177e4
LT		 2564 };
2565 unsigned long now = jiffies;
2566 int status;
2567
2568 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2569 if (status < 0)
2570 return status;
2571 spin_lock(&clp->cl_lock);
2572 if (time_before(clp->cl_last_renewal,now))
2573 clp->cl_last_renewal = now;
2574 spin_unlock(&clp->cl_lock);
2575 return 0;
2576}
2577
aa1870af
BF		 2578static inline int nfs4_server_supports_acls(struct nfs_server *server)
2579{
2580 return (server->caps & NFS_CAP_ACLS)
2581 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2582 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2583}
2584
2585/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2586 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2587 * the stack.
2588 */
2589#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2590
2591static void buf_to_pages(const void *buf, size_t buflen,
2592 struct page **pages, unsigned int *pgbase)
2593{
2594 const void *p = buf;
2595
2596 *pgbase = offset_in_page(buf);
2597 p -= *pgbase;
2598 while (p < buf + buflen) {
2599 *(pages++) = virt_to_page(p);
2600 p += PAGE_CACHE_SIZE;
2601 }
2602}
2603
e50a1c2e
BF		 2604struct nfs4_cached_acl {
2605 int cached;
2606 size_t len;
3e9d4154 2607 char data[0];
e50a1c2e
BF		 2608};
2609
2610static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2611{
2612 struct nfs_inode *nfsi = NFS_I(inode);
2613
2614 spin_lock(&inode->i_lock);
2615 kfree(nfsi->nfs4_acl);
2616 nfsi->nfs4_acl = acl;
2617 spin_unlock(&inode->i_lock);
2618}
2619
2620static void nfs4_zap_acl_attr(struct inode *inode)
2621{
2622 nfs4_set_cached_acl(inode, NULL);
2623}
2624
2625static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2626{
2627 struct nfs_inode *nfsi = NFS_I(inode);
2628 struct nfs4_cached_acl *acl;
2629 int ret = -ENOENT;
2630
2631 spin_lock(&inode->i_lock);
2632 acl = nfsi->nfs4_acl;
2633 if (acl == NULL)
2634 goto out;
2635 if (buf == NULL) /* user is just asking for length */
2636 goto out_len;
2637 if (acl->cached == 0)
2638 goto out;
2639 ret = -ERANGE; /* see getxattr(2) man page */
2640 if (acl->len > buflen)
2641 goto out;
2642 memcpy(buf, acl->data, acl->len);
2643out_len:
2644 ret = acl->len;
2645out:
2646 spin_unlock(&inode->i_lock);
2647 return ret;
2648}
2649
2650static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2651{
2652 struct nfs4_cached_acl *acl;
2653
2654 if (buf && acl_len <= PAGE_SIZE) {
2655 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2656 if (acl == NULL)
2657 goto out;
2658 acl->cached = 1;
2659 memcpy(acl->data, buf, acl_len);
2660 } else {
2661 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2662 if (acl == NULL)
2663 goto out;
2664 acl->cached = 0;
2665 }
2666 acl->len = acl_len;
2667out:
2668 nfs4_set_cached_acl(inode, acl);
2669}
2670
16b4289c 2671static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2672{
aa1870af
BF		 2673 struct page *pages[NFS4ACL_MAXPAGES];
2674 struct nfs_getaclargs args = {
2675 .fh = NFS_FH(inode),
2676 .acl_pages = pages,
2677 .acl_len = buflen,
2678 };
2679 size_t resp_len = buflen;
e50a1c2e 2680 void *resp_buf;
aa1870af
BF		 2681 struct rpc_message msg = {
2682 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2683 .rpc_argp = &args,
2684 .rpc_resp = &resp_len,
2685 };
e50a1c2e 2686 struct page *localpage = NULL;
aa1870af
BF		 2687 int ret;
2688
e50a1c2e
BF		 2689 if (buflen < PAGE_SIZE) {
2690 /* As long as we're doing a round trip to the server anyway,
2691 * let's be prepared for a page of acl data. */
2692 localpage = alloc_page(GFP_KERNEL);
2693 resp_buf = page_address(localpage);
2694 if (localpage == NULL)
2695 return -ENOMEM;
2696 args.acl_pages[0] = localpage;
2697 args.acl_pgbase = 0;
1d95db8e 2698 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2699 } else {
2700 resp_buf = buf;
2701 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2702 }
aa1870af 2703 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2704 if (ret)
2705 goto out_free;
2706 if (resp_len > args.acl_len)
2707 nfs4_write_cached_acl(inode, NULL, resp_len);
2708 else
2709 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2710 if (buf) {
2711 ret = -ERANGE;
2712 if (resp_len > buflen)
2713 goto out_free;
2714 if (localpage)
2715 memcpy(buf, resp_buf, resp_len);
2716 }
2717 ret = resp_len;
2718out_free:
2719 if (localpage)
2720 __free_page(localpage);
aa1870af
BF		 2721 return ret;
2722}
2723
16b4289c
TM		 2724static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2725{
2726 struct nfs4_exception exception = { };
2727 ssize_t ret;
2728 do {
2729 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2730 if (ret >= 0)
2731 break;
2732 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2733 } while (exception.retry);
2734 return ret;
2735}
2736
e50a1c2e
BF		 2737static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2738{
2739 struct nfs_server *server = NFS_SERVER(inode);
2740 int ret;
2741
2742 if (!nfs4_server_supports_acls(server))
2743 return -EOPNOTSUPP;
2744 ret = nfs_revalidate_inode(server, inode);
2745 if (ret < 0)
2746 return ret;
2747 ret = nfs4_read_cached_acl(inode, buf, buflen);
2748 if (ret != -ENOENT)
2749 return ret;
2750 return nfs4_get_acl_uncached(inode, buf, buflen);
2751}
2752
16b4289c 2753static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2754{
2755 struct nfs_server *server = NFS_SERVER(inode);
2756 struct page *pages[NFS4ACL_MAXPAGES];
2757 struct nfs_setaclargs arg = {
2758 .fh = NFS_FH(inode),
2759 .acl_pages = pages,
2760 .acl_len = buflen,
2761 };
2762 struct rpc_message msg = {
2763 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2764 .rpc_argp = &arg,
2765 .rpc_resp = NULL,
2766 };
2767 int ret;
2768
2769 if (!nfs4_server_supports_acls(server))
2770 return -EOPNOTSUPP;
642ac549 2771 nfs_inode_return_delegation(inode);
4b580ee3
BF		 2772 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2773 ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
e50a1c2e
BF		 2774 if (ret == 0)
2775 nfs4_write_cached_acl(inode, buf, buflen);
4b580ee3
BF		 2776 return ret;
2777}
2778
16b4289c
TM		 2779static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2780{
2781 struct nfs4_exception exception = { };
2782 int err;
2783 do {
2784 err = nfs4_handle_exception(NFS_SERVER(inode),
2785 __nfs4_proc_set_acl(inode, buf, buflen),
2786 &exception);
2787 } while (exception.retry);
2788 return err;
2789}
2790
1da177e4 2791static int
faf5f49c 2792nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4
LT		 2793{
2794 struct nfs4_client *clp = server->nfs4_state;
2795
2796 if (!clp || task->tk_status >= 0)
2797 return 0;
2798 switch(task->tk_status) {
2799 case -NFS4ERR_STALE_CLIENTID:
2800 case -NFS4ERR_STALE_STATEID:
2801 case -NFS4ERR_EXPIRED:
2802 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2803 nfs4_schedule_state_recovery(clp);
433fbe4c 2804 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2805 rpc_wake_up_task(task);
2806 task->tk_status = 0;
2807 return -EAGAIN;
1da177e4 2808 case -NFS4ERR_DELAY:
006ea73e
CL		 2809 nfs_inc_server_stats((struct nfs_server *) server,
2810 NFSIOS_DELAY);
2811 case -NFS4ERR_GRACE:
1da177e4
LT		 2812 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2813 task->tk_status = 0;
2814 return -EAGAIN;
2815 case -NFS4ERR_OLD_STATEID:
2816 task->tk_status = 0;
2817 return -EAGAIN;
2818 }
2819 task->tk_status = nfs4_map_errors(task->tk_status);
2820 return 0;
2821}
2822
433fbe4c
TM		 2823static int nfs4_wait_bit_interruptible(void *word)
2824{
2825 if (signal_pending(current))
2826 return -ERESTARTSYS;
2827 schedule();
2828 return 0;
2829}
2830
1da177e4
LT		 2831static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2832{
1da177e4 2833 sigset_t oldset;
433fbe4c 2834 int res;
1da177e4
LT		 2835
2836 might_sleep();
2837
2838 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2839 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2840 nfs4_wait_bit_interruptible,
2841 TASK_INTERRUPTIBLE);
1da177e4
LT		 2842 rpc_clnt_sigunmask(clnt, &oldset);
2843 return res;
2844}
2845
2846static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2847{
2848 sigset_t oldset;
2849 int res = 0;
2850
2851 might_sleep();
2852
2853 if (*timeout <= 0)
2854 *timeout = NFS4_POLL_RETRY_MIN;
2855 if (*timeout > NFS4_POLL_RETRY_MAX)
2856 *timeout = NFS4_POLL_RETRY_MAX;
2857 rpc_clnt_sigmask(clnt, &oldset);
2858 if (clnt->cl_intr) {
041e0e3b 2859 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2860 if (signalled())
2861 res = -ERESTARTSYS;
041e0e3b
NA		 2862 } else
2863 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2864 rpc_clnt_sigunmask(clnt, &oldset);
2865 *timeout <<= 1;
2866 return res;
2867}
2868
2869/* This is the error handling routine for processes that are allowed
2870 * to sleep.
2871 */
faf5f49c 2872int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4
LT		 2873{
2874 struct nfs4_client *clp = server->nfs4_state;
2875 int ret = errorcode;
2876
2877 exception->retry = 0;
2878 switch(errorcode) {
2879 case 0:
2880 return 0;
2881 case -NFS4ERR_STALE_CLIENTID:
2882 case -NFS4ERR_STALE_STATEID:
2883 case -NFS4ERR_EXPIRED:
433fbe4c 2884 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2885 ret = nfs4_wait_clnt_recover(server->client, clp);
2886 if (ret == 0)
2887 exception->retry = 1;
2888 break;
2889 case -NFS4ERR_GRACE:
2890 case -NFS4ERR_DELAY:
2891 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2892 if (ret != 0)
2893 break;
1da177e4 2894 case -NFS4ERR_OLD_STATEID:
2c56617d 2895 exception->retry = 1;
1da177e4
LT		 2896 }
2897 /* We failed to handle the error */
2898 return nfs4_map_errors(ret);
2899}
2900
286d7d6a 2901int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2902{
2903 nfs4_verifier sc_verifier;
2904 struct nfs4_setclientid setclientid = {
2905 .sc_verifier = &sc_verifier,
2906 .sc_prog = program,
2907 };
2908 struct rpc_message msg = {
2909 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2910 .rpc_argp = &setclientid,
2911 .rpc_resp = clp,
286d7d6a 2912 .rpc_cred = cred,
1da177e4
LT		 2913 };
2914 u32 *p;
2915 int loop = 0;
2916 int status;
2917
2918 p = (u32*)sc_verifier.data;
2919 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2920 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2921
2922 for(;;) {
2923 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2924 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2925 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
286d7d6a 2926 cred->cr_ops->cr_name,
1da177e4
LT		 2927 clp->cl_id_uniquifier);
2928 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2929 sizeof(setclientid.sc_netid), "tcp");
2930 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2931 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2932 clp->cl_ipaddr, port >> 8, port & 255);
2933
2934 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2935 if (status != -NFS4ERR_CLID_INUSE)
2936 break;
2937 if (signalled())
2938 break;
2939 if (loop++ & 1)
2940 ssleep(clp->cl_lease_time + 1);
2941 else
2942 if (++clp->cl_id_uniquifier == 0)
2943 break;
2944 }
2945 return status;
2946}
2947
51581f3b 2948static int _nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2949{
2950 struct nfs_fsinfo fsinfo;
2951 struct rpc_message msg = {
2952 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2953 .rpc_argp = clp,
2954 .rpc_resp = &fsinfo,
286d7d6a 2955 .rpc_cred = cred,
1da177e4
LT		 2956 };
2957 unsigned long now;
2958 int status;
2959
2960 now = jiffies;
2961 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2962 if (status == 0) {
2963 spin_lock(&clp->cl_lock);
2964 clp->cl_lease_time = fsinfo.lease_time * HZ;
2965 clp->cl_last_renewal = now;
58d9714a 2966 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2967 spin_unlock(&clp->cl_lock);
2968 }
2969 return status;
2970}
2971
51581f3b
TM		 2972int nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
2973{
2974 long timeout;
2975 int err;
2976 do {
2977 err = _nfs4_proc_setclientid_confirm(clp, cred);
2978 switch (err) {
2979 case 0:
2980 return err;
2981 case -NFS4ERR_RESOURCE:
2982 /* The IBM lawyers misread another document! */
2983 case -NFS4ERR_DELAY:
2984 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2985 }
2986 } while (err == 0);
2987 return err;
2988}
2989
fe650407
TM		 2990struct nfs4_delegreturndata {
2991 struct nfs4_delegreturnargs args;
fa178f29 2992 struct nfs4_delegreturnres res;
fe650407
TM		 2993 struct nfs_fh fh;
2994 nfs4_stateid stateid;
2995 struct rpc_cred *cred;
26e976a8 2996 unsigned long timestamp;
fa178f29 2997 struct nfs_fattr fattr;
fe650407
TM		 2998 int rpc_status;
2999};
3000
3001static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 3002{
fe650407 3003 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 3004 struct rpc_message msg = {
3005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 3006 .rpc_argp = &data->args,
fa178f29 3007 .rpc_resp = &data->res,
fe650407 3008 .rpc_cred = data->cred,
1da177e4 3009 };
fa178f29 3010 nfs_fattr_init(data->res.fattr);
fe650407
TM		 3011 rpc_call_setup(task, &msg, 0);
3012}
1da177e4 3013
fe650407
TM		 3014static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3015{
3016 struct nfs4_delegreturndata *data = calldata;
3017 data->rpc_status = task->tk_status;
26e976a8 3018 if (data->rpc_status == 0)
fa178f29 3019 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 3020}
3021
3022static void nfs4_delegreturn_release(void *calldata)
3023{
3024 struct nfs4_delegreturndata *data = calldata;
3025
3026 put_rpccred(data->cred);
3027 kfree(calldata);
3028}
3029
c8d149f3 3030static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 3031 .rpc_call_prepare = nfs4_delegreturn_prepare,
3032 .rpc_call_done = nfs4_delegreturn_done,
3033 .rpc_release = nfs4_delegreturn_release,
3034};
3035
3036static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3037{
3038 struct nfs4_delegreturndata *data;
fa178f29 3039 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 3040 struct rpc_task *task;
3041 int status;
3042
3043 data = kmalloc(sizeof(*data), GFP_KERNEL);
3044 if (data == NULL)
3045 return -ENOMEM;
3046 data->args.fhandle = &data->fh;
3047 data->args.stateid = &data->stateid;
fa178f29 3048 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 3049 nfs_copy_fh(&data->fh, NFS_FH(inode));
3050 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 3051 data->res.fattr = &data->fattr;
3052 data->res.server = server;
fe650407 3053 data->cred = get_rpccred(cred);
26e976a8 3054 data->timestamp = jiffies;
fe650407
TM		 3055 data->rpc_status = 0;
3056
3057 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 3058 if (IS_ERR(task))
fe650407 3059 return PTR_ERR(task);
fe650407 3060 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 3061 if (status == 0) {
fe650407 3062 status = data->rpc_status;
fa178f29
TM		 3063 if (status == 0)
3064 nfs_post_op_update_inode(inode, &data->fattr);
3065 }
fe650407
TM		 3066 rpc_release_task(task);
3067 return status;
1da177e4
LT		 3068}
3069
3070int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3071{
3072 struct nfs_server *server = NFS_SERVER(inode);
3073 struct nfs4_exception exception = { };
3074 int err;
3075 do {
3076 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3077 switch (err) {
3078 case -NFS4ERR_STALE_STATEID:
3079 case -NFS4ERR_EXPIRED:
3080 nfs4_schedule_state_recovery(server->nfs4_state);
3081 case 0:
3082 return 0;
3083 }
3084 err = nfs4_handle_exception(server, err, &exception);
3085 } while (exception.retry);
3086 return err;
3087}
3088
3089#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3090#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3091
3092/*
3093 * sleep, with exponential backoff, and retry the LOCK operation.
3094 */
3095static unsigned long
3096nfs4_set_lock_task_retry(unsigned long timeout)
3097{
041e0e3b 3098 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3099 timeout <<= 1;
3100 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3101 return NFS4_LOCK_MAXTIMEOUT;
3102 return timeout;
3103}
3104
1da177e4
LT		 3105static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3106{
3107 struct inode *inode = state->inode;
3108 struct nfs_server *server = NFS_SERVER(inode);
3109 struct nfs4_client *clp = server->nfs4_state;
911d1aaf 3110 struct nfs_lockt_args arg = {
1da177e4 3111 .fh = NFS_FH(inode),
911d1aaf 3112 .fl = request,
1da177e4 3113 };
911d1aaf
TM		 3114 struct nfs_lockt_res res = {
3115 .denied = request,
1da177e4
LT		 3116 };
3117 struct rpc_message msg = {
3118 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3119 .rpc_argp = &arg,
3120 .rpc_resp = &res,
3121 .rpc_cred = state->owner->so_cred,
3122 };
1da177e4
LT		 3123 struct nfs4_lock_state *lsp;
3124 int status;
3125
3126 down_read(&clp->cl_sem);
911d1aaf 3127 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3128 status = nfs4_set_lock_state(state, request);
3129 if (status != 0)
3130 goto out;
3131 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3132 arg.lock_owner.id = lsp->ls_id;
1da177e4 3133 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3134 switch (status) {
3135 case 0:
3136 request->fl_type = F_UNLCK;
3137 break;
3138 case -NFS4ERR_DENIED:
3139 status = 0;
1da177e4 3140 }
8d0a8a9d 3141out:
1da177e4
LT		 3142 up_read(&clp->cl_sem);
3143 return status;
3144}
3145
3146static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3147{
3148 struct nfs4_exception exception = { };
3149 int err;
3150
3151 do {
3152 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3153 _nfs4_proc_getlk(state, cmd, request),
3154 &exception);
3155 } while (exception.retry);
3156 return err;
3157}
3158
3159static int do_vfs_lock(struct file *file, struct file_lock *fl)
3160{
3161 int res = 0;
3162 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3163 case FL_POSIX:
3164 res = posix_lock_file_wait(file, fl);
3165 break;
3166 case FL_FLOCK:
3167 res = flock_lock_file_wait(file, fl);
3168 break;
3169 default:
3170 BUG();
3171 }
1da177e4
LT		 3172 return res;
3173}
3174
faf5f49c 3175struct nfs4_unlockdata {
911d1aaf
TM		 3176 struct nfs_locku_args arg;
3177 struct nfs_locku_res res;
faf5f49c
TM		 3178 struct nfs4_lock_state *lsp;
3179 struct nfs_open_context *ctx;
911d1aaf
TM		 3180 struct file_lock fl;
3181 const struct nfs_server *server;
26e976a8 3182 unsigned long timestamp;
faf5f49c
TM		 3183};
3184
911d1aaf
TM		 3185static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3186 struct nfs_open_context *ctx,
3187 struct nfs4_lock_state *lsp,
3188 struct nfs_seqid *seqid)
3189{
3190 struct nfs4_unlockdata *p;
3191 struct inode *inode = lsp->ls_state->inode;
3192
3193 p = kmalloc(sizeof(*p), GFP_KERNEL);
3194 if (p == NULL)
3195 return NULL;
3196 p->arg.fh = NFS_FH(inode);
3197 p->arg.fl = &p->fl;
3198 p->arg.seqid = seqid;
3199 p->arg.stateid = &lsp->ls_stateid;
3200 p->lsp = lsp;
3201 atomic_inc(&lsp->ls_count);
3202 /* Ensure we don't close file until we're done freeing locks! */
3203 p->ctx = get_nfs_open_context(ctx);
3204 memcpy(&p->fl, fl, sizeof(p->fl));
3205 p->server = NFS_SERVER(inode);
3206 return p;
3207}
3208
06f814a3 3209static void nfs4_locku_release_calldata(void *data)
faf5f49c 3210{
963d8fe5 3211 struct nfs4_unlockdata *calldata = data;
911d1aaf 3212 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3213 nfs4_put_lock_state(calldata->lsp);
3214 put_nfs_open_context(calldata->ctx);
3215 kfree(calldata);
faf5f49c
TM		 3216}
3217
963d8fe5 3218static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3219{
963d8fe5 3220 struct nfs4_unlockdata *calldata = data;
faf5f49c 3221
06f814a3
TM		 3222 if (RPC_ASSASSINATED(task))
3223 return;
911d1aaf 3224 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3225 switch (task->tk_status) {
3226 case 0:
3227 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3228 calldata->res.stateid.data,
faf5f49c 3229 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3230 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3231 break;
3232 case -NFS4ERR_STALE_STATEID:
3233 case -NFS4ERR_EXPIRED:
911d1aaf 3234 nfs4_schedule_state_recovery(calldata->server->nfs4_state);
faf5f49c
TM		 3235 break;
3236 default:
911d1aaf 3237 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
faf5f49c 3238 rpc_restart_call(task);
faf5f49c
TM		 3239 }
3240 }
faf5f49c
TM		 3241}
3242
4ce70ada 3243static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3244{
4ce70ada 3245 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3246 struct rpc_message msg = {
3247 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3248 .rpc_argp = &calldata->arg,
3249 .rpc_resp = &calldata->res,
3250 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3251 };
faf5f49c 3252
911d1aaf 3253 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3254 return;
3255 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3256 /* Note: exit _without_ running nfs4_locku_done */
3257 task->tk_action = NULL;
faf5f49c
TM		 3258 return;
3259 }
26e976a8 3260 calldata->timestamp = jiffies;
faf5f49c
TM		 3261 rpc_call_setup(task, &msg, 0);
3262}
3263
963d8fe5 3264static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3265 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3266 .rpc_call_done = nfs4_locku_done,
06f814a3 3267 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3268};
3269
a5d16a4d
TM		 3270static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3271 struct nfs_open_context *ctx,
3272 struct nfs4_lock_state *lsp,
3273 struct nfs_seqid *seqid)
3274{
3275 struct nfs4_unlockdata *data;
a5d16a4d
TM		 3276
3277 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3278 if (data == NULL) {
3279 nfs_free_seqid(seqid);
3280 return ERR_PTR(-ENOMEM);
3281 }
3282
7a1218a2 3283 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3284}
3285
faf5f49c
TM		 3286static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3287{
911d1aaf 3288 struct nfs_seqid *seqid;
1da177e4 3289 struct nfs4_lock_state *lsp;
06f814a3
TM		 3290 struct rpc_task *task;
3291 int status = 0;
faf5f49c 3292
8d0a8a9d 3293 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3294 /* Unlock _before_ we do the RPC call */
3295 request->fl_flags |= FL_EXISTS;
3296 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3297 goto out;
8d0a8a9d 3298 if (status != 0)
9b073574
TM		 3299 goto out;
3300 /* Is this a delegated lock? */
3301 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3302 goto out;
8d0a8a9d 3303 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3304 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3305 status = -ENOMEM;
911d1aaf 3306 if (seqid == NULL)
9b073574 3307 goto out;
a5d16a4d
TM		 3308 task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3309 status = PTR_ERR(task);
3310 if (IS_ERR(task))
9b073574 3311 goto out;
a5d16a4d
TM		 3312 status = nfs4_wait_for_completion_rpc_task(task);
3313 rpc_release_task(task);
9b073574 3314out:
1da177e4
LT		 3315 return status;
3316}
3317
a5d16a4d
TM		 3318struct nfs4_lockdata {
3319 struct nfs_lock_args arg;
3320 struct nfs_lock_res res;
3321 struct nfs4_lock_state *lsp;
3322 struct nfs_open_context *ctx;
3323 struct file_lock fl;
26e976a8 3324 unsigned long timestamp;
a5d16a4d
TM		 3325 int rpc_status;
3326 int cancelled;
3327};
3328
3329static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3330 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3331{
a5d16a4d
TM		 3332 struct nfs4_lockdata *p;
3333 struct inode *inode = lsp->ls_state->inode;
1da177e4 3334 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3335
3336 p = kzalloc(sizeof(*p), GFP_KERNEL);
3337 if (p == NULL)
3338 return NULL;
3339
3340 p->arg.fh = NFS_FH(inode);
3341 p->arg.fl = &p->fl;
3342 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3343 if (p->arg.lock_seqid == NULL)
3344 goto out_free;
3345 p->arg.lock_stateid = &lsp->ls_stateid;
3346 p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid;
3347 p->arg.lock_owner.id = lsp->ls_id;
3348 p->lsp = lsp;
3349 atomic_inc(&lsp->ls_count);
3350 p->ctx = get_nfs_open_context(ctx);
3351 memcpy(&p->fl, fl, sizeof(p->fl));
3352 return p;
3353out_free:
3354 kfree(p);
3355 return NULL;
3356}
3357
3358static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3359{
3360 struct nfs4_lockdata *data = calldata;
3361 struct nfs4_state *state = data->lsp->ls_state;
3362 struct nfs4_state_owner *sp = state->owner;
1da177e4 3363 struct rpc_message msg = {
a5d16a4d
TM		 3364 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3365 .rpc_argp = &data->arg,
3366 .rpc_resp = &data->res,
3367 .rpc_cred = sp->so_cred,
1da177e4 3368 };
06735b34 3369
a5d16a4d
TM		 3370 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3371 return;
3372 dprintk("%s: begin!\n", __FUNCTION__);
3373 /* Do we need to do an open_to_lock_owner? */
3374 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3375 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3376 if (data->arg.open_seqid == NULL) {
3377 data->rpc_status = -ENOMEM;
3378 task->tk_action = NULL;
06735b34 3379 goto out;
8d0a8a9d 3380 }
a5d16a4d
TM		 3381 data->arg.open_stateid = &state->stateid;
3382 data->arg.new_lock_owner = 1;
3383 }
26e976a8 3384 data->timestamp = jiffies;
a5d16a4d 3385 rpc_call_setup(task, &msg, 0);
06735b34 3386out:
a5d16a4d
TM		 3387 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3388}
3389
3390static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3391{
3392 struct nfs4_lockdata *data = calldata;
3393
3394 dprintk("%s: begin!\n", __FUNCTION__);
3395
3396 data->rpc_status = task->tk_status;
3397 if (RPC_ASSASSINATED(task))
3398 goto out;
3399 if (data->arg.new_lock_owner != 0) {
3400 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3401 if (data->rpc_status == 0)
3402 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3403 else
3404 goto out;
3405 }
3406 if (data->rpc_status == 0) {
3407 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3408 sizeof(data->lsp->ls_stateid.data));
3409 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
26e976a8 3410 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3411 }
3412 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3413out:
3414 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3415}
3416
3417static void nfs4_lock_release(void *calldata)
3418{
3419 struct nfs4_lockdata *data = calldata;
3420
3421 dprintk("%s: begin!\n", __FUNCTION__);
3422 if (data->arg.open_seqid != NULL)
3423 nfs_free_seqid(data->arg.open_seqid);
3424 if (data->cancelled != 0) {
3425 struct rpc_task *task;
3426 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3427 data->arg.lock_seqid);
3428 if (!IS_ERR(task))
3429 rpc_release_task(task);
3430 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3431 } else
3432 nfs_free_seqid(data->arg.lock_seqid);
3433 nfs4_put_lock_state(data->lsp);
3434 put_nfs_open_context(data->ctx);
3435 kfree(data);
3436 dprintk("%s: done!\n", __FUNCTION__);
3437}
3438
3439static const struct rpc_call_ops nfs4_lock_ops = {
3440 .rpc_call_prepare = nfs4_lock_prepare,
3441 .rpc_call_done = nfs4_lock_done,
3442 .rpc_release = nfs4_lock_release,
3443};
3444
3445static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3446{
3447 struct nfs4_lockdata *data;
3448 struct rpc_task *task;
3449 int ret;
3450
3451 dprintk("%s: begin!\n", __FUNCTION__);
3452 data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3453 fl->fl_u.nfs4_fl.owner);
3454 if (data == NULL)
3455 return -ENOMEM;
3456 if (IS_SETLKW(cmd))
3457 data->arg.block = 1;
3458 if (reclaim != 0)
3459 data->arg.reclaim = 1;
3460 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3461 &nfs4_lock_ops, data);
7a1218a2 3462 if (IS_ERR(task))
a5d16a4d 3463 return PTR_ERR(task);
a5d16a4d
TM		 3464 ret = nfs4_wait_for_completion_rpc_task(task);
3465 if (ret == 0) {
3466 ret = data->rpc_status;
3467 if (ret == -NFS4ERR_DENIED)
3468 ret = -EAGAIN;
3469 } else
3470 data->cancelled = 1;
3471 rpc_release_task(task);
3472 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3473 return ret;
1da177e4
LT		 3474}
3475
3476static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3477{
202b50dc
TM		 3478 struct nfs_server *server = NFS_SERVER(state->inode);
3479 struct nfs4_exception exception = { };
3480 int err;
3481
3482 do {
42a2d13e
TM		 3483 /* Cache the lock if possible... */
3484 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3485 return 0;
202b50dc
TM		 3486 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3487 if (err != -NFS4ERR_DELAY)
3488 break;
3489 nfs4_handle_exception(server, err, &exception);
3490 } while (exception.retry);
3491 return err;
1da177e4
LT		 3492}
3493
3494static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3495{
202b50dc
TM		 3496 struct nfs_server *server = NFS_SERVER(state->inode);
3497 struct nfs4_exception exception = { };
3498 int err;
3499
6bfc93ef
TM		 3500 err = nfs4_set_lock_state(state, request);
3501 if (err != 0)
3502 return err;
202b50dc 3503 do {
42a2d13e
TM		 3504 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3505 return 0;
202b50dc
TM		 3506 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3507 if (err != -NFS4ERR_DELAY)
3508 break;
3509 nfs4_handle_exception(server, err, &exception);
3510 } while (exception.retry);
3511 return err;
1da177e4
LT		 3512}
3513
3514static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3515{
3516 struct nfs4_client *clp = state->owner->so_client;
01c3b861 3517 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3518 int status;
3519
6bfc93ef 3520 /* Is this a delegated open? */
6bfc93ef
TM		 3521 status = nfs4_set_lock_state(state, request);
3522 if (status != 0)
3523 goto out;
01c3b861
TM		 3524 request->fl_flags |= FL_ACCESS;
3525 status = do_vfs_lock(request->fl_file, request);
3526 if (status < 0)
3527 goto out;
3528 down_read(&clp->cl_sem);
3529 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3530 struct nfs_inode *nfsi = NFS_I(state->inode);
3531 /* Yes: cache locks! */
3532 down_read(&nfsi->rwsem);
3533 /* ...but avoid races with delegation recall... */
3534 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3535 request->fl_flags = fl_flags & ~FL_SLEEP;
3536 status = do_vfs_lock(request->fl_file, request);
3537 up_read(&nfsi->rwsem);
3538 goto out_unlock;
3539 }
3540 up_read(&nfsi->rwsem);
3541 }
6bfc93ef
TM		 3542 status = _nfs4_do_setlk(state, cmd, request, 0);
3543 if (status != 0)
01c3b861 3544 goto out_unlock;
6bfc93ef 3545 /* Note: we always want to sleep here! */
01c3b861 3546 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3547 if (do_vfs_lock(request->fl_file, request) < 0)
3548 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3549out_unlock:
1da177e4 3550 up_read(&clp->cl_sem);
01c3b861
TM		 3551out:
3552 request->fl_flags = fl_flags;
1da177e4
LT		 3553 return status;
3554}
3555
3556static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3557{
3558 struct nfs4_exception exception = { };
3559 int err;
3560
3561 do {
3562 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3563 _nfs4_proc_setlk(state, cmd, request),
3564 &exception);
3565 } while (exception.retry);
3566 return err;
3567}
3568
3569static int
3570nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3571{
3572 struct nfs_open_context *ctx;
3573 struct nfs4_state *state;
3574 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3575 int status;
3576
3577 /* verify open state */
3578 ctx = (struct nfs_open_context *)filp->private_data;
3579 state = ctx->state;
3580
3581 if (request->fl_start < 0 || request->fl_end < 0)
3582 return -EINVAL;
3583
3584 if (IS_GETLK(cmd))
3585 return nfs4_proc_getlk(state, F_GETLK, request);
3586
3587 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3588 return -EINVAL;
3589
3590 if (request->fl_type == F_UNLCK)
3591 return nfs4_proc_unlck(state, cmd, request);
3592
3593 do {
3594 status = nfs4_proc_setlk(state, cmd, request);
3595 if ((status != -EAGAIN) || IS_SETLK(cmd))
3596 break;
3597 timeout = nfs4_set_lock_task_retry(timeout);
3598 status = -ERESTARTSYS;
3599 if (signalled())
3600 break;
3601 } while(status < 0);
1da177e4
LT		 3602 return status;
3603}
3604
888e694c
TM		 3605int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3606{
3607 struct nfs_server *server = NFS_SERVER(state->inode);
3608 struct nfs4_exception exception = { };
3609 int err;
3610
3611 err = nfs4_set_lock_state(state, fl);
3612 if (err != 0)
3613 goto out;
3614 do {
3615 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3616 if (err != -NFS4ERR_DELAY)
3617 break;
3618 err = nfs4_handle_exception(server, err, &exception);
3619 } while (exception.retry);
3620out:
3621 return err;
3622}
6b3b5496 3623
aa1870af
BF		 3624#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3625
6b3b5496
BF		 3626int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3627 size_t buflen, int flags)
3628{
4b580ee3
BF		 3629 struct inode *inode = dentry->d_inode;
3630
3631 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3632 return -EOPNOTSUPP;
3633
3634 if (!S_ISREG(inode->i_mode) &&
3635 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3636 return -EPERM;
3637
3638 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3639}
3640
3641/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3642 * and that's what we'll do for e.g. user attributes that haven't been set.
3643 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3644 * attributes in kernel-managed attribute namespaces. */
3645ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3646 size_t buflen)
3647{
aa1870af
BF		 3648 struct inode *inode = dentry->d_inode;
3649
3650 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3651 return -EOPNOTSUPP;
3652
3653 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3654}
3655
3656ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3657{
aa1870af 3658 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3659
096455a2
BF		 3660 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3661 return 0;
6b3b5496
BF		 3662 if (buf && buflen < len)
3663 return -ERANGE;
3664 if (buf)
aa1870af
BF		 3665 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3666 return len;
6b3b5496
BF		 3667}
3668
683b57b4 3669int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
7aaa0b3b 3670 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3671{
3672 struct nfs_server *server = NFS_SERVER(dir);
3673 u32 bitmask[2] = {
361e624f
MN		 3674 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3675 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3676 };
3677 struct nfs4_fs_locations_arg args = {
3678 .dir_fh = NFS_FH(dir),
3679 .name = &dentry->d_name,
3680 .page = page,
3681 .bitmask = bitmask,
3682 };
3683 struct rpc_message msg = {
3684 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3685 .rpc_argp = &args,
7aaa0b3b 3686 .rpc_resp = fs_locations,
683b57b4
TM		 3687 };
3688 int status;
3689
3690 dprintk("%s: start\n", __FUNCTION__);
3691 fs_locations->fattr.valid = 0;
3692 fs_locations->server = server;
830b8e33 3693 fs_locations->nlocations = 0;
683b57b4
TM		 3694 status = rpc_call_sync(server->client, &msg, 0);
3695 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3696 return status;
3697}
3698
1da177e4
LT		 3699struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3700 .recover_open = nfs4_open_reclaim,
3701 .recover_lock = nfs4_lock_reclaim,
3702};
3703
3704struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3705 .recover_open = nfs4_open_expired,
3706 .recover_lock = nfs4_lock_expired,
3707};
3708
6b3b5496
BF		 3709static struct inode_operations nfs4_file_inode_operations = {
3710 .permission = nfs_permission,
3711 .getattr = nfs_getattr,
3712 .setattr = nfs_setattr,
3713 .getxattr = nfs4_getxattr,
3714 .setxattr = nfs4_setxattr,
3715 .listxattr = nfs4_listxattr,
3716};
3717
1da177e4
LT		 3718struct nfs_rpc_ops nfs_v4_clientops = {
3719 .version = 4, /* protocol version */
3720 .dentry_ops = &nfs4_dentry_operations,
3721 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3722 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3723 .getroot = nfs4_proc_get_root,
3724 .getattr = nfs4_proc_getattr,
3725 .setattr = nfs4_proc_setattr,
3726 .lookup = nfs4_proc_lookup,
3727 .access = nfs4_proc_access,
3728 .readlink = nfs4_proc_readlink,
3729 .read = nfs4_proc_read,
3730 .write = nfs4_proc_write,
3731 .commit = nfs4_proc_commit,
3732 .create = nfs4_proc_create,
3733 .remove = nfs4_proc_remove,
3734 .unlink_setup = nfs4_proc_unlink_setup,
3735 .unlink_done = nfs4_proc_unlink_done,
3736 .rename = nfs4_proc_rename,
3737 .link = nfs4_proc_link,
3738 .symlink = nfs4_proc_symlink,
3739 .mkdir = nfs4_proc_mkdir,
3740 .rmdir = nfs4_proc_remove,
3741 .readdir = nfs4_proc_readdir,
3742 .mknod = nfs4_proc_mknod,
3743 .statfs = nfs4_proc_statfs,
3744 .fsinfo = nfs4_proc_fsinfo,
3745 .pathconf = nfs4_proc_pathconf,
3746 .decode_dirent = nfs4_decode_dirent,
3747 .read_setup = nfs4_proc_read_setup,
ec06c096 3748 .read_done = nfs4_read_done,
1da177e4 3749 .write_setup = nfs4_proc_write_setup,
788e7a89 3750 .write_done = nfs4_write_done,
1da177e4 3751 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3752 .commit_done = nfs4_commit_done,
02a913a7
TM		 3753 .file_open = nfs_open,
3754 .file_release = nfs_release,
1da177e4 3755 .lock = nfs4_proc_lock,
e50a1c2e 3756 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3757};
3758
3759/*
3760 * Local variables:
3761 * c-basic-offset: 8
3762 * End:
3763 */
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