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[PATCH] sstfb: add sysfs interface
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
006ea73e 54#include "iostat.h"
1da177e4
LT		 55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
2066fe89 58#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
cdd4e68b 61struct nfs4_opendata;
864472e9 62static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
1da177e4 65static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
faf5f49c 66static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
adfa6f98 67static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
1da177e4 68
1da177e4
LT		 69/* Prevent leaks of NFSv4 errors into userland */
70int nfs4_map_errors(int err)
71{
72 if (err < -1000) {
73 dprintk("%s could not handle NFSv4 error %d\n",
74 __FUNCTION__, -err);
75 return -EIO;
76 }
77 return err;
78}
79
80/*
81 * This is our standard bitmap for GETATTR requests.
82 */
83const u32 nfs4_fattr_bitmap[2] = {
84 FATTR4_WORD0_TYPE
85 | FATTR4_WORD0_CHANGE
86 | FATTR4_WORD0_SIZE
87 | FATTR4_WORD0_FSID
88 | FATTR4_WORD0_FILEID,
89 FATTR4_WORD1_MODE
90 | FATTR4_WORD1_NUMLINKS
91 | FATTR4_WORD1_OWNER
92 | FATTR4_WORD1_OWNER_GROUP
93 | FATTR4_WORD1_RAWDEV
94 | FATTR4_WORD1_SPACE_USED
95 | FATTR4_WORD1_TIME_ACCESS
96 | FATTR4_WORD1_TIME_METADATA
97 | FATTR4_WORD1_TIME_MODIFY
98};
99
100const u32 nfs4_statfs_bitmap[2] = {
101 FATTR4_WORD0_FILES_AVAIL
102 | FATTR4_WORD0_FILES_FREE
103 | FATTR4_WORD0_FILES_TOTAL,
104 FATTR4_WORD1_SPACE_AVAIL
105 | FATTR4_WORD1_SPACE_FREE
106 | FATTR4_WORD1_SPACE_TOTAL
107};
108
4ce79717 109const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 110 FATTR4_WORD0_MAXLINK
111 | FATTR4_WORD0_MAXNAME,
112 0
113};
114
115const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
116 | FATTR4_WORD0_MAXREAD
117 | FATTR4_WORD0_MAXWRITE
118 | FATTR4_WORD0_LEASE_TIME,
119 0
120};
121
830b8e33
MN		 122const u32 nfs4_fs_locations_bitmap[2] = {
123 FATTR4_WORD0_TYPE
124 | FATTR4_WORD0_CHANGE
125 | FATTR4_WORD0_SIZE
126 | FATTR4_WORD0_FSID
127 | FATTR4_WORD0_FILEID
128 | FATTR4_WORD0_FS_LOCATIONS,
129 FATTR4_WORD1_MODE
130 | FATTR4_WORD1_NUMLINKS
131 | FATTR4_WORD1_OWNER
132 | FATTR4_WORD1_OWNER_GROUP
133 | FATTR4_WORD1_RAWDEV
134 | FATTR4_WORD1_SPACE_USED
135 | FATTR4_WORD1_TIME_ACCESS
136 | FATTR4_WORD1_TIME_METADATA
137 | FATTR4_WORD1_TIME_MODIFY
138 | FATTR4_WORD1_MOUNTED_ON_FILEID
139};
140
bc4785cd 141static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 142 struct nfs4_readdir_arg *readdir)
143{
0dbb4c67 144 __be32 *start, *p;
1da177e4
LT		 145
146 BUG_ON(readdir->count < 80);
147 if (cookie > 2) {
b7ef1956 148 readdir->cookie = cookie;
1da177e4
LT		 149 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
150 return;
151 }
152
153 readdir->cookie = 0;
154 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
155 if (cookie == 2)
156 return;
157
158 /*
159 * NFSv4 servers do not return entries for '.' and '..'
160 * Therefore, we fake these entries here. We let '.'
161 * have cookie 0 and '..' have cookie 1. Note that
162 * when talking to the server, we always send cookie 0
163 * instead of 1 or 2.
164 */
0dbb4c67 165 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 166
167 if (cookie == 0) {
168 *p++ = xdr_one; /* next */
169 *p++ = xdr_zero; /* cookie, first word */
170 *p++ = xdr_one; /* cookie, second word */
171 *p++ = xdr_one; /* entry len */
172 memcpy(p, ".\0\0\0", 4); /* entry */
173 p++;
174 *p++ = xdr_one; /* bitmap length */
175 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
176 *p++ = htonl(8); /* attribute buffer length */
177 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
178 }
179
180 *p++ = xdr_one; /* next */
181 *p++ = xdr_zero; /* cookie, first word */
182 *p++ = xdr_two; /* cookie, second word */
183 *p++ = xdr_two; /* entry len */
184 memcpy(p, "..\0\0", 4); /* entry */
185 p++;
186 *p++ = xdr_one; /* bitmap length */
187 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
188 *p++ = htonl(8); /* attribute buffer length */
189 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
190
191 readdir->pgbase = (char *)p - (char *)start;
192 readdir->count -= readdir->pgbase;
193 kunmap_atomic(start, KM_USER0);
194}
195
26e976a8 196static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 197{
7539bbab 198 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 199 spin_lock(&clp->cl_lock);
200 if (time_before(clp->cl_last_renewal,timestamp))
201 clp->cl_last_renewal = timestamp;
202 spin_unlock(&clp->cl_lock);
203}
204
38478b24 205static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 206{
38478b24 207 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 208
38478b24
TM		 209 spin_lock(&dir->i_lock);
210 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
1da177e4
LT		 211 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
212 nfsi->change_attr = cinfo->after;
38478b24 213 spin_unlock(&dir->i_lock);
1da177e4
LT		 214}
215
e56e0b78 216struct nfs4_opendata {
24ac23ab 217 atomic_t count;
e56e0b78
TM		 218 struct nfs_openargs o_arg;
219 struct nfs_openres o_res;
cdd4e68b
TM		 220 struct nfs_open_confirmargs c_arg;
221 struct nfs_open_confirmres c_res;
e56e0b78
TM		 222 struct nfs_fattr f_attr;
223 struct nfs_fattr dir_attr;
224 struct dentry *dentry;
225 struct dentry *dir;
226 struct nfs4_state_owner *owner;
227 struct iattr attrs;
26e976a8 228 unsigned long timestamp;
24ac23ab
TM		 229 int rpc_status;
230 int cancelled;
e56e0b78
TM		 231};
232
233static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
234 struct nfs4_state_owner *sp, int flags,
235 const struct iattr *attrs)
236{
237 struct dentry *parent = dget_parent(dentry);
238 struct inode *dir = parent->d_inode;
239 struct nfs_server *server = NFS_SERVER(dir);
240 struct nfs4_opendata *p;
241
242 p = kzalloc(sizeof(*p), GFP_KERNEL);
243 if (p == NULL)
244 goto err;
245 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
246 if (p->o_arg.seqid == NULL)
247 goto err_free;
24ac23ab 248 atomic_set(&p->count, 1);
e56e0b78
TM		 249 p->dentry = dget(dentry);
250 p->dir = parent;
251 p->owner = sp;
252 atomic_inc(&sp->so_count);
253 p->o_arg.fh = NFS_FH(dir);
254 p->o_arg.open_flags = flags,
7539bbab 255 p->o_arg.clientid = server->nfs_client->cl_clientid;
e56e0b78
TM		 256 p->o_arg.id = sp->so_id;
257 p->o_arg.name = &dentry->d_name;
258 p->o_arg.server = server;
259 p->o_arg.bitmask = server->attr_bitmask;
260 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
261 p->o_res.f_attr = &p->f_attr;
262 p->o_res.dir_attr = &p->dir_attr;
263 p->o_res.server = server;
264 nfs_fattr_init(&p->f_attr);
265 nfs_fattr_init(&p->dir_attr);
266 if (flags & O_EXCL) {
267 u32 *s = (u32 *) p->o_arg.u.verifier.data;
268 s[0] = jiffies;
269 s[1] = current->pid;
270 } else if (flags & O_CREAT) {
271 p->o_arg.u.attrs = &p->attrs;
272 memcpy(&p->attrs, attrs, sizeof(p->attrs));
273 }
cdd4e68b
TM		 274 p->c_arg.fh = &p->o_res.fh;
275 p->c_arg.stateid = &p->o_res.stateid;
276 p->c_arg.seqid = p->o_arg.seqid;
e56e0b78
TM		 277 return p;
278err_free:
279 kfree(p);
280err:
281 dput(parent);
282 return NULL;
283}
284
285static void nfs4_opendata_free(struct nfs4_opendata *p)
286{
24ac23ab 287 if (p != NULL && atomic_dec_and_test(&p->count)) {
e56e0b78
TM		 288 nfs_free_seqid(p->o_arg.seqid);
289 nfs4_put_state_owner(p->owner);
290 dput(p->dir);
291 dput(p->dentry);
292 kfree(p);
293 }
294}
295
9512135d 296/* Helper for asynchronous RPC calls */
4ce70ada 297static int nfs4_call_async(struct rpc_clnt *clnt,
963d8fe5 298 const struct rpc_call_ops *tk_ops, void *calldata)
9512135d
TM		 299{
300 struct rpc_task *task;
301
963d8fe5 302 if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
9512135d 303 return -ENOMEM;
9512135d
TM		 304 rpc_execute(task);
305 return 0;
306}
307
06f814a3
TM		 308static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
309{
310 sigset_t oldset;
311 int ret;
312
313 rpc_clnt_sigmask(task->tk_client, &oldset);
314 ret = rpc_wait_for_completion_task(task);
315 rpc_clnt_sigunmask(task->tk_client, &oldset);
316 return ret;
317}
318
e7616923
TM		 319static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
320{
321 switch (open_flags) {
322 case FMODE_WRITE:
323 state->n_wronly++;
324 break;
325 case FMODE_READ:
326 state->n_rdonly++;
327 break;
328 case FMODE_READ|FMODE_WRITE:
329 state->n_rdwr++;
330 }
331}
332
1da177e4
LT		 333static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
334{
335 struct inode *inode = state->inode;
336
337 open_flags &= (FMODE_READ|FMODE_WRITE);
d530838b 338 /* Protect against nfs4_find_state_byowner() */
ec073428 339 spin_lock(&state->owner->so_lock);
1da177e4 340 spin_lock(&inode->i_lock);
4cecb76f 341 memcpy(&state->stateid, stateid, sizeof(state->stateid));
e7616923 342 update_open_stateflags(state, open_flags);
4cecb76f 343 nfs4_state_set_mode_locked(state, state->state | open_flags);
1da177e4 344 spin_unlock(&inode->i_lock);
ec073428 345 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 346}
347
24ac23ab
TM		 348static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
349{
350 struct inode *inode;
351 struct nfs4_state *state = NULL;
352
353 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
354 goto out;
355 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
03f28e3a 356 if (IS_ERR(inode))
24ac23ab
TM		 357 goto out;
358 state = nfs4_get_open_state(inode, data->owner);
359 if (state == NULL)
360 goto put_inode;
361 update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
362put_inode:
363 iput(inode);
364out:
365 return state;
366}
367
864472e9
TM		 368static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
369{
370 struct nfs_inode *nfsi = NFS_I(state->inode);
371 struct nfs_open_context *ctx;
372
373 spin_lock(&state->inode->i_lock);
374 list_for_each_entry(ctx, &nfsi->open_files, list) {
375 if (ctx->state != state)
376 continue;
377 get_nfs_open_context(ctx);
378 spin_unlock(&state->inode->i_lock);
379 return ctx;
380 }
381 spin_unlock(&state->inode->i_lock);
382 return ERR_PTR(-ENOENT);
383}
384
385static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
386{
387 int ret;
388
389 opendata->o_arg.open_flags = openflags;
390 ret = _nfs4_proc_open(opendata);
391 if (ret != 0)
392 return ret;
393 memcpy(stateid->data, opendata->o_res.stateid.data,
394 sizeof(stateid->data));
395 return 0;
396}
397
398static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
399{
400 nfs4_stateid stateid;
401 struct nfs4_state *newstate;
402 int mode = 0;
403 int delegation = 0;
404 int ret;
405
406 /* memory barrier prior to reading state->n_* */
407 smp_rmb();
408 if (state->n_rdwr != 0) {
409 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
410 if (ret != 0)
411 return ret;
412 mode |= FMODE_READ|FMODE_WRITE;
413 if (opendata->o_res.delegation_type != 0)
414 delegation = opendata->o_res.delegation_type;
415 smp_rmb();
416 }
417 if (state->n_wronly != 0) {
418 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
419 if (ret != 0)
420 return ret;
421 mode |= FMODE_WRITE;
422 if (opendata->o_res.delegation_type != 0)
423 delegation = opendata->o_res.delegation_type;
424 smp_rmb();
425 }
426 if (state->n_rdonly != 0) {
427 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
428 if (ret != 0)
429 return ret;
430 mode |= FMODE_READ;
431 }
432 clear_bit(NFS_DELEGATED_STATE, &state->flags);
433 if (mode == 0)
434 return 0;
435 if (opendata->o_res.delegation_type == 0)
436 opendata->o_res.delegation_type = delegation;
437 opendata->o_arg.open_flags |= mode;
438 newstate = nfs4_opendata_to_nfs4_state(opendata);
439 if (newstate != NULL) {
440 if (opendata->o_res.delegation_type != 0) {
441 struct nfs_inode *nfsi = NFS_I(newstate->inode);
442 int delegation_flags = 0;
443 if (nfsi->delegation)
444 delegation_flags = nfsi->delegation->flags;
445 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
446 nfs_inode_set_delegation(newstate->inode,
447 opendata->owner->so_cred,
448 &opendata->o_res);
449 else
450 nfs_inode_reclaim_delegation(newstate->inode,
451 opendata->owner->so_cred,
452 &opendata->o_res);
453 }
454 nfs4_close_state(newstate, opendata->o_arg.open_flags);
455 }
456 if (newstate != state)
457 return -ESTALE;
458 return 0;
459}
460
1da177e4
LT		 461/*
462 * OPEN_RECLAIM:
463 * reclaim state on the server after a reboot.
1da177e4 464 */
864472e9 465static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
1da177e4 466{
864472e9
TM		 467 struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
468 struct nfs4_opendata *opendata;
469 int delegation_type = 0;
1da177e4
LT		 470 int status;
471
472 if (delegation != NULL) {
473 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
474 memcpy(&state->stateid, &delegation->stateid,
475 sizeof(state->stateid));
476 set_bit(NFS_DELEGATED_STATE, &state->flags);
477 return 0;
478 }
864472e9 479 delegation_type = delegation->type;
1da177e4 480 }
864472e9
TM		 481 opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
482 if (opendata == NULL)
cee54fc9 483 return -ENOMEM;
864472e9
TM		 484 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
485 opendata->o_arg.fh = NFS_FH(state->inode);
486 nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
487 opendata->o_arg.u.delegation_type = delegation_type;
488 status = nfs4_open_recover(opendata, state);
489 nfs4_opendata_free(opendata);
1da177e4
LT		 490 return status;
491}
492
864472e9 493static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
1da177e4
LT		 494{
495 struct nfs_server *server = NFS_SERVER(state->inode);
496 struct nfs4_exception exception = { };
497 int err;
498 do {
864472e9 499 err = _nfs4_do_open_reclaim(sp, state, dentry);
202b50dc
TM		 500 if (err != -NFS4ERR_DELAY)
501 break;
502 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 503 } while (exception.retry);
504 return err;
505}
506
864472e9
TM		 507static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
508{
509 struct nfs_open_context *ctx;
510 int ret;
511
512 ctx = nfs4_state_find_open_context(state);
513 if (IS_ERR(ctx))
514 return PTR_ERR(ctx);
515 ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
516 put_nfs_open_context(ctx);
517 return ret;
518}
519
1da177e4
LT		 520static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
521{
522 struct nfs4_state_owner *sp = state->owner;
e56e0b78 523 struct nfs4_opendata *opendata;
864472e9 524 int ret;
1da177e4 525
1da177e4 526 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
864472e9
TM		 527 return 0;
528 opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
e56e0b78 529 if (opendata == NULL)
864472e9 530 return -ENOMEM;
e56e0b78 531 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
e56e0b78
TM		 532 memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
533 sizeof(opendata->o_arg.u.delegation.data));
864472e9 534 ret = nfs4_open_recover(opendata, state);
e56e0b78 535 nfs4_opendata_free(opendata);
864472e9 536 return ret;
1da177e4
LT		 537}
538
539int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
540{
541 struct nfs4_exception exception = { };
542 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
543 int err;
544 do {
545 err = _nfs4_open_delegation_recall(dentry, state);
546 switch (err) {
547 case 0:
548 return err;
549 case -NFS4ERR_STALE_CLIENTID:
550 case -NFS4ERR_STALE_STATEID:
551 case -NFS4ERR_EXPIRED:
552 /* Don't recall a delegation if it was lost */
7539bbab 553 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 554 return err;
555 }
556 err = nfs4_handle_exception(server, err, &exception);
557 } while (exception.retry);
558 return err;
559}
560
cdd4e68b 561static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1da177e4 562{
cdd4e68b
TM		 563 struct nfs4_opendata *data = calldata;
564 struct rpc_message msg = {
565 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
566 .rpc_argp = &data->c_arg,
567 .rpc_resp = &data->c_res,
568 .rpc_cred = data->owner->so_cred,
1da177e4 569 };
26e976a8 570 data->timestamp = jiffies;
cdd4e68b
TM		 571 rpc_call_setup(task, &msg, 0);
572}
573
574static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
575{
576 struct nfs4_opendata *data = calldata;
577
578 data->rpc_status = task->tk_status;
579 if (RPC_ASSASSINATED(task))
580 return;
26e976a8 581 if (data->rpc_status == 0) {
cdd4e68b
TM		 582 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
583 sizeof(data->o_res.stateid.data));
26e976a8
TM		 584 renew_lease(data->o_res.server, data->timestamp);
585 }
cdd4e68b
TM		 586 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
587 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
588}
589
590static void nfs4_open_confirm_release(void *calldata)
591{
592 struct nfs4_opendata *data = calldata;
593 struct nfs4_state *state = NULL;
594
595 /* If this request hasn't been cancelled, do nothing */
596 if (data->cancelled == 0)
597 goto out_free;
598 /* In case of error, no cleanup! */
599 if (data->rpc_status != 0)
600 goto out_free;
601 nfs_confirm_seqid(&data->owner->so_seqid, 0);
602 state = nfs4_opendata_to_nfs4_state(data);
603 if (state != NULL)
604 nfs4_close_state(state, data->o_arg.open_flags);
605out_free:
606 nfs4_opendata_free(data);
607}
608
609static const struct rpc_call_ops nfs4_open_confirm_ops = {
610 .rpc_call_prepare = nfs4_open_confirm_prepare,
611 .rpc_call_done = nfs4_open_confirm_done,
612 .rpc_release = nfs4_open_confirm_release,
613};
614
615/*
616 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
617 */
618static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
619{
620 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
621 struct rpc_task *task;
1da177e4
LT		 622 int status;
623
cdd4e68b 624 atomic_inc(&data->count);
7a1218a2
TM		 625 /*
626 * If rpc_run_task() ends up calling ->rpc_release(), we
627 * want to ensure that it takes the 'error' code path.
628 */
629 data->rpc_status = -ENOMEM;
cdd4e68b 630 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
7a1218a2 631 if (IS_ERR(task))
cdd4e68b 632 return PTR_ERR(task);
cdd4e68b
TM		 633 status = nfs4_wait_for_completion_rpc_task(task);
634 if (status != 0) {
635 data->cancelled = 1;
636 smp_wmb();
637 } else
638 status = data->rpc_status;
e6b3c4db 639 rpc_put_task(task);
1da177e4
LT		 640 return status;
641}
642
24ac23ab 643static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 644{
24ac23ab
TM		 645 struct nfs4_opendata *data = calldata;
646 struct nfs4_state_owner *sp = data->owner;
1da177e4
LT		 647 struct rpc_message msg = {
648 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
24ac23ab
TM		 649 .rpc_argp = &data->o_arg,
650 .rpc_resp = &data->o_res,
1da177e4
LT		 651 .rpc_cred = sp->so_cred,
652 };
24ac23ab
TM		 653
654 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
655 return;
656 /* Update sequence id. */
657 data->o_arg.id = sp->so_id;
658 data->o_arg.clientid = sp->so_client->cl_clientid;
864472e9
TM		 659 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
660 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
26e976a8 661 data->timestamp = jiffies;
24ac23ab
TM		 662 rpc_call_setup(task, &msg, 0);
663}
1da177e4 664
24ac23ab
TM		 665static void nfs4_open_done(struct rpc_task *task, void *calldata)
666{
667 struct nfs4_opendata *data = calldata;
1da177e4 668
24ac23ab
TM		 669 data->rpc_status = task->tk_status;
670 if (RPC_ASSASSINATED(task))
671 return;
672 if (task->tk_status == 0) {
673 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 674 case S_IFREG:
675 break;
676 case S_IFLNK:
24ac23ab 677 data->rpc_status = -ELOOP;
6f926b5b
TM		 678 break;
679 case S_IFDIR:
24ac23ab 680 data->rpc_status = -EISDIR;
6f926b5b
TM		 681 break;
682 default:
24ac23ab 683 data->rpc_status = -ENOTDIR;
6f926b5b 684 }
26e976a8 685 renew_lease(data->o_res.server, data->timestamp);
6f926b5b 686 }
24ac23ab
TM		 687 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
688}
6f926b5b 689
24ac23ab
TM		 690static void nfs4_open_release(void *calldata)
691{
692 struct nfs4_opendata *data = calldata;
693 struct nfs4_state *state = NULL;
694
695 /* If this request hasn't been cancelled, do nothing */
696 if (data->cancelled == 0)
697 goto out_free;
698 /* In case of error, no cleanup! */
699 if (data->rpc_status != 0)
700 goto out_free;
701 /* In case we need an open_confirm, no cleanup! */
702 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
703 goto out_free;
704 nfs_confirm_seqid(&data->owner->so_seqid, 0);
705 state = nfs4_opendata_to_nfs4_state(data);
706 if (state != NULL)
707 nfs4_close_state(state, data->o_arg.open_flags);
708out_free:
709 nfs4_opendata_free(data);
710}
711
712static const struct rpc_call_ops nfs4_open_ops = {
713 .rpc_call_prepare = nfs4_open_prepare,
714 .rpc_call_done = nfs4_open_done,
715 .rpc_release = nfs4_open_release,
716};
717
718/*
719 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
720 */
721static int _nfs4_proc_open(struct nfs4_opendata *data)
722{
723 struct inode *dir = data->dir->d_inode;
724 struct nfs_server *server = NFS_SERVER(dir);
725 struct nfs_openargs *o_arg = &data->o_arg;
726 struct nfs_openres *o_res = &data->o_res;
727 struct rpc_task *task;
728 int status;
729
730 atomic_inc(&data->count);
7a1218a2
TM		 731 /*
732 * If rpc_run_task() ends up calling ->rpc_release(), we
733 * want to ensure that it takes the 'error' code path.
734 */
735 data->rpc_status = -ENOMEM;
24ac23ab 736 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
7a1218a2 737 if (IS_ERR(task))
24ac23ab 738 return PTR_ERR(task);
24ac23ab
TM		 739 status = nfs4_wait_for_completion_rpc_task(task);
740 if (status != 0) {
741 data->cancelled = 1;
742 smp_wmb();
743 } else
744 status = data->rpc_status;
e6b3c4db 745 rpc_put_task(task);
1da177e4 746 if (status != 0)
24ac23ab
TM		 747 return status;
748
56ae19f3
TM		 749 if (o_arg->open_flags & O_CREAT) {
750 update_changeattr(dir, &o_res->cinfo);
751 nfs_post_op_update_inode(dir, o_res->dir_attr);
752 } else
753 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 754 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 755 status = _nfs4_proc_open_confirm(data);
1da177e4 756 if (status != 0)
24ac23ab 757 return status;
1da177e4 758 }
24ac23ab 759 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1da177e4 760 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
8fa5c000 761 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 762 return 0;
1da177e4
LT		 763}
764
765static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
766{
767 struct nfs_access_entry cache;
768 int mask = 0;
769 int status;
770
771 if (openflags & FMODE_READ)
772 mask |= MAY_READ;
773 if (openflags & FMODE_WRITE)
774 mask |= MAY_WRITE;
775 status = nfs_access_get_cached(inode, cred, &cache);
776 if (status == 0)
777 goto out;
778
779 /* Be clever: ask server to check for all possible rights */
780 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
781 cache.cred = cred;
782 cache.jiffies = jiffies;
783 status = _nfs4_proc_access(inode, &cache);
784 if (status != 0)
785 return status;
786 nfs_access_add_cache(inode, &cache);
787out:
788 if ((cache.mask & mask) == mask)
789 return 0;
790 return -EACCES;
791}
792
58d9714a
TM		 793int nfs4_recover_expired_lease(struct nfs_server *server)
794{
7539bbab 795 struct nfs_client *clp = server->nfs_client;
6b30954e 796 int ret;
58d9714a 797
6b30954e
TM		 798 for (;;) {
799 ret = nfs4_wait_clnt_recover(server->client, clp);
800 if (ret != 0)
801 return ret;
802 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
803 break;
58d9714a 804 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 805 }
806 return 0;
58d9714a
TM		 807}
808
1da177e4
LT		 809/*
810 * OPEN_EXPIRED:
811 * reclaim state on the server after a network partition.
812 * Assumes caller holds the appropriate lock
813 */
814static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
815{
1da177e4 816 struct inode *inode = state->inode;
1da177e4 817 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
e56e0b78 818 struct nfs4_opendata *opendata;
24ac23ab 819 int openflags = state->state & (FMODE_READ|FMODE_WRITE);
864472e9 820 int ret;
1da177e4
LT		 821
822 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
864472e9
TM		 823 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
824 if (ret < 0)
825 return ret;
1da177e4
LT		 826 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
827 set_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9 828 return 0;
1da177e4 829 }
24ac23ab 830 opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
e56e0b78 831 if (opendata == NULL)
864472e9
TM		 832 return -ENOMEM;
833 ret = nfs4_open_recover(opendata, state);
834 if (ret == -ESTALE) {
835 /* Invalidate the state owner so we don't ever use it again */
836 nfs4_drop_state_owner(sp);
837 d_drop(dentry);
1da177e4 838 }
e56e0b78 839 nfs4_opendata_free(opendata);
864472e9 840 return ret;
1da177e4
LT		 841}
842
202b50dc
TM		 843static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
844{
845 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
846 struct nfs4_exception exception = { };
847 int err;
848
849 do {
850 err = _nfs4_open_expired(sp, state, dentry);
851 if (err == -NFS4ERR_DELAY)
852 nfs4_handle_exception(server, err, &exception);
853 } while (exception.retry);
854 return err;
855}
856
1da177e4
LT		 857static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
858{
1da177e4 859 struct nfs_open_context *ctx;
864472e9 860 int ret;
1da177e4 861
864472e9
TM		 862 ctx = nfs4_state_find_open_context(state);
863 if (IS_ERR(ctx))
864 return PTR_ERR(ctx);
865 ret = nfs4_do_open_expired(sp, state, ctx->dentry);
866 put_nfs_open_context(ctx);
867 return ret;
1da177e4
LT		 868}
869
870/*
24ac23ab 871 * Returns a referenced nfs4_state if there is an open delegation on the file
1da177e4
LT		 872 */
873static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
874{
875 struct nfs_delegation *delegation;
876 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 877 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 878 struct nfs_inode *nfsi = NFS_I(inode);
879 struct nfs4_state_owner *sp = NULL;
880 struct nfs4_state *state = NULL;
881 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
882 int err;
883
b4454fe1
TM		 884 err = -ENOMEM;
885 if (!(sp = nfs4_get_state_owner(server, cred))) {
886 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
887 return err;
888 }
58d9714a
TM		 889 err = nfs4_recover_expired_lease(server);
890 if (err != 0)
b4454fe1 891 goto out_put_state_owner;
1da177e4
LT		 892 /* Protect against reboot recovery - NOTE ORDER! */
893 down_read(&clp->cl_sem);
894 /* Protect against delegation recall */
895 down_read(&nfsi->rwsem);
896 delegation = NFS_I(inode)->delegation;
897 err = -ENOENT;
898 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
899 goto out_err;
900 err = -ENOMEM;
1da177e4
LT		 901 state = nfs4_get_open_state(inode, sp);
902 if (state == NULL)
903 goto out_err;
904
905 err = -ENOENT;
906 if ((state->state & open_flags) == open_flags) {
907 spin_lock(&inode->i_lock);
e7616923 908 update_open_stateflags(state, open_flags);
1da177e4
LT		 909 spin_unlock(&inode->i_lock);
910 goto out_ok;
911 } else if (state->state != 0)
b4454fe1 912 goto out_put_open_state;
1da177e4
LT		 913
914 lock_kernel();
915 err = _nfs4_do_access(inode, cred, open_flags);
916 unlock_kernel();
917 if (err != 0)
b4454fe1 918 goto out_put_open_state;
1da177e4
LT		 919 set_bit(NFS_DELEGATED_STATE, &state->flags);
920 update_open_stateid(state, &delegation->stateid, open_flags);
921out_ok:
1da177e4
LT		 922 nfs4_put_state_owner(sp);
923 up_read(&nfsi->rwsem);
924 up_read(&clp->cl_sem);
1da177e4 925 *res = state;
b4454fe1
TM		 926 return 0;
927out_put_open_state:
928 nfs4_put_open_state(state);
1da177e4 929out_err:
1da177e4
LT		 930 up_read(&nfsi->rwsem);
931 up_read(&clp->cl_sem);
b8e5c4c2
TM		 932 if (err != -EACCES)
933 nfs_inode_return_delegation(inode);
b4454fe1
TM		 934out_put_state_owner:
935 nfs4_put_state_owner(sp);
1da177e4
LT		 936 return err;
937}
938
939static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
940{
941 struct nfs4_exception exception = { };
a162a6b8 942 struct nfs4_state *res = ERR_PTR(-EIO);
1da177e4
LT		 943 int err;
944
945 do {
946 err = _nfs4_open_delegated(inode, flags, cred, &res);
947 if (err == 0)
948 break;
949 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
950 err, &exception));
951 } while (exception.retry);
952 return res;
953}
954
955/*
24ac23ab 956 * Returns a referenced nfs4_state
1da177e4
LT		 957 */
958static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
959{
960 struct nfs4_state_owner *sp;
961 struct nfs4_state *state = NULL;
962 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 963 struct nfs_client *clp = server->nfs_client;
e56e0b78 964 struct nfs4_opendata *opendata;
1da177e4 965 int status;
1da177e4
LT		 966
967 /* Protect against reboot recovery conflicts */
1da177e4
LT		 968 status = -ENOMEM;
969 if (!(sp = nfs4_get_state_owner(server, cred))) {
970 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
971 goto out_err;
972 }
58d9714a
TM		 973 status = nfs4_recover_expired_lease(server);
974 if (status != 0)
b4454fe1 975 goto err_put_state_owner;
58d9714a
TM		 976 down_read(&clp->cl_sem);
977 status = -ENOMEM;
e56e0b78
TM		 978 opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
979 if (opendata == NULL)
76723de0 980 goto err_release_rwsem;
1da177e4 981
24ac23ab 982 status = _nfs4_proc_open(opendata);
1da177e4 983 if (status != 0)
e56e0b78 984 goto err_opendata_free;
1da177e4
LT		 985
986 status = -ENOMEM;
24ac23ab
TM		 987 state = nfs4_opendata_to_nfs4_state(opendata);
988 if (state == NULL)
e56e0b78 989 goto err_opendata_free;
e56e0b78 990 if (opendata->o_res.delegation_type != 0)
24ac23ab 991 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
e56e0b78 992 nfs4_opendata_free(opendata);
1da177e4
LT		 993 nfs4_put_state_owner(sp);
994 up_read(&clp->cl_sem);
995 *res = state;
996 return 0;
e56e0b78
TM		 997err_opendata_free:
998 nfs4_opendata_free(opendata);
76723de0
TM		 999err_release_rwsem:
1000 up_read(&clp->cl_sem);
e56e0b78
TM		 1001err_put_state_owner:
1002 nfs4_put_state_owner(sp);
1da177e4 1003out_err:
1da177e4
LT		 1004 *res = NULL;
1005 return status;
1006}
1007
1008
1009static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1010{
1011 struct nfs4_exception exception = { };
1012 struct nfs4_state *res;
1013 int status;
1014
1015 do {
1016 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1017 if (status == 0)
1018 break;
1019 /* NOTE: BAD_SEQID means the server and client disagree about the
1020 * book-keeping w.r.t. state-changing operations
1021 * (OPEN/CLOSE/LOCK/LOCKU...)
1022 * It is actually a sign of a bug on the client or on the server.
1023 *
1024 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1025 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1026 * have unhashed the old state_owner for us, and that we can
1027 * therefore safely retry using a new one. We should still warn
1028 * the user though...
1029 */
1030 if (status == -NFS4ERR_BAD_SEQID) {
1031 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1032 exception.retry = 1;
1033 continue;
1034 }
550f5747
TM		 1035 /*
1036 * BAD_STATEID on OPEN means that the server cancelled our
1037 * state before it received the OPEN_CONFIRM.
1038 * Recover by retrying the request as per the discussion
1039 * on Page 181 of RFC3530.
1040 */
1041 if (status == -NFS4ERR_BAD_STATEID) {
1042 exception.retry = 1;
1043 continue;
1044 }
1da177e4
LT		 1045 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1046 status, &exception));
1047 } while (exception.retry);
1048 return res;
1049}
1050
3e4f6290
TM		 1051static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1052 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1053{
3e4f6290 1054 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1055 struct nfs_setattrargs arg = {
3e4f6290 1056 .fh = NFS_FH(inode),
1da177e4
LT		 1057 .iap = sattr,
1058 .server = server,
1059 .bitmask = server->attr_bitmask,
1060 };
1061 struct nfs_setattrres res = {
1062 .fattr = fattr,
1063 .server = server,
1064 };
1065 struct rpc_message msg = {
1066 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1067 .rpc_argp = &arg,
1068 .rpc_resp = &res,
1069 };
26e976a8 1070 unsigned long timestamp = jiffies;
65e4308d 1071 int status;
1da177e4 1072
0e574af1 1073 nfs_fattr_init(fattr);
1da177e4 1074
3e4f6290
TM		 1075 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1076 /* Use that stateid */
1077 } else if (state != NULL) {
1da177e4 1078 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1079 nfs4_copy_stateid(&arg.stateid, state, current->files);
1080 } else
1da177e4
LT		 1081 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1082
65e4308d 1083 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1084 if (status == 0 && state != NULL)
1085 renew_lease(server, timestamp);
65e4308d 1086 return status;
1da177e4
LT		 1087}
1088
3e4f6290
TM		 1089static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1090 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1091{
3e4f6290 1092 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1093 struct nfs4_exception exception = { };
1094 int err;
1095 do {
1096 err = nfs4_handle_exception(server,
3e4f6290 1097 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1098 &exception);
1099 } while (exception.retry);
1100 return err;
1101}
1102
1103struct nfs4_closedata {
1104 struct inode *inode;
1105 struct nfs4_state *state;
1106 struct nfs_closeargs arg;
1107 struct nfs_closeres res;
516a6af6 1108 struct nfs_fattr fattr;
26e976a8 1109 unsigned long timestamp;
1da177e4
LT		 1110};
1111
963d8fe5 1112static void nfs4_free_closedata(void *data)
9512135d 1113{
963d8fe5
TM		 1114 struct nfs4_closedata *calldata = data;
1115 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1116
1117 nfs4_put_open_state(calldata->state);
1118 nfs_free_seqid(calldata->arg.seqid);
9512135d 1119 nfs4_put_state_owner(sp);
9512135d
TM		 1120 kfree(calldata);
1121}
1122
963d8fe5 1123static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1124{
963d8fe5 1125 struct nfs4_closedata *calldata = data;
1da177e4 1126 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1127 struct nfs_server *server = NFS_SERVER(calldata->inode);
1128
4ce70ada
TM		 1129 if (RPC_ASSASSINATED(task))
1130 return;
1da177e4
LT		 1131 /* hmm. we are done with the inode, and in the process of freeing
1132 * the state_owner. we keep this around to process errors
1133 */
cee54fc9 1134 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1135 switch (task->tk_status) {
1136 case 0:
1137 memcpy(&state->stateid, &calldata->res.stateid,
1138 sizeof(state->stateid));
26e976a8 1139 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1140 break;
1141 case -NFS4ERR_STALE_STATEID:
1142 case -NFS4ERR_EXPIRED:
7539bbab 1143 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 1144 break;
1145 default:
1146 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1147 rpc_restart_call(task);
1148 return;
1149 }
1150 }
516a6af6 1151 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1152}
1153
4ce70ada 1154static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1155{
4ce70ada 1156 struct nfs4_closedata *calldata = data;
9512135d 1157 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1158 struct rpc_message msg = {
1159 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1160 .rpc_argp = &calldata->arg,
1161 .rpc_resp = &calldata->res,
9512135d 1162 .rpc_cred = state->owner->so_cred,
1da177e4 1163 };
4cecb76f 1164 int mode = 0, old_mode;
9512135d 1165
963d8fe5 1166 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1167 return;
9512135d
TM		 1168 /* Recalculate the new open mode in case someone reopened the file
1169 * while we were waiting in line to be scheduled.
1170 */
4cecb76f
TM		 1171 spin_lock(&state->owner->so_lock);
1172 spin_lock(&calldata->inode->i_lock);
1173 mode = old_mode = state->state;
e7616923
TM		 1174 if (state->n_rdwr == 0) {
1175 if (state->n_rdonly == 0)
1176 mode &= ~FMODE_READ;
1177 if (state->n_wronly == 0)
1178 mode &= ~FMODE_WRITE;
1179 }
4cecb76f
TM		 1180 nfs4_state_set_mode_locked(state, mode);
1181 spin_unlock(&calldata->inode->i_lock);
1182 spin_unlock(&state->owner->so_lock);
1183 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
963d8fe5
TM		 1184 /* Note: exit _without_ calling nfs4_close_done */
1185 task->tk_action = NULL;
9512135d
TM		 1186 return;
1187 }
516a6af6 1188 nfs_fattr_init(calldata->res.fattr);
9512135d 1189 if (mode != 0)
1da177e4 1190 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d 1191 calldata->arg.open_flags = mode;
26e976a8 1192 calldata->timestamp = jiffies;
9512135d 1193 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1194}
1195
963d8fe5 1196static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1197 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1198 .rpc_call_done = nfs4_close_done,
1199 .rpc_release = nfs4_free_closedata,
1200};
1201
1da177e4
LT		 1202/*
1203 * It is possible for data to be read/written from a mem-mapped file
1204 * after the sys_close call (which hits the vfs layer as a flush).
1205 * This means that we can't safely call nfsv4 close on a file until
1206 * the inode is cleared. This in turn means that we are not good
1207 * NFSv4 citizens - we do not indicate to the server to update the file's
1208 * share state even when we are done with one of the three share
1209 * stateid's in the inode.
1210 *
1211 * NOTE: Caller must be holding the sp->so_owner semaphore!
1212 */
4cecb76f 1213int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1da177e4 1214{
516a6af6 1215 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1216 struct nfs4_closedata *calldata;
9512135d 1217 int status = -ENOMEM;
1da177e4 1218
9512135d 1219 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1220 if (calldata == NULL)
9512135d 1221 goto out;
1da177e4
LT		 1222 calldata->inode = inode;
1223 calldata->state = state;
1224 calldata->arg.fh = NFS_FH(inode);
9512135d 1225 calldata->arg.stateid = &state->stateid;
1da177e4 1226 /* Serialization for the sequence id */
cee54fc9 1227 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1228 if (calldata->arg.seqid == NULL)
1229 goto out_free_calldata;
516a6af6
TM		 1230 calldata->arg.bitmask = server->attr_bitmask;
1231 calldata->res.fattr = &calldata->fattr;
1232 calldata->res.server = server;
9512135d 1233
4ce70ada 1234 status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
9512135d
TM		 1235 if (status == 0)
1236 goto out;
1237
1238 nfs_free_seqid(calldata->arg.seqid);
1239out_free_calldata:
1240 kfree(calldata);
1241out:
1242 return status;
1da177e4
LT		 1243}
1244
95cf959b 1245static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
02a913a7
TM		 1246{
1247 struct file *filp;
1248
1249 filp = lookup_instantiate_filp(nd, dentry, NULL);
1250 if (!IS_ERR(filp)) {
1251 struct nfs_open_context *ctx;
1252 ctx = (struct nfs_open_context *)filp->private_data;
1253 ctx->state = state;
95cf959b
TM		 1254 return 0;
1255 }
1256 nfs4_close_state(state, nd->intent.open.flags);
1257 return PTR_ERR(filp);
02a913a7
TM		 1258}
1259
1260struct dentry *
1da177e4
LT		 1261nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1262{
1263 struct iattr attr;
1264 struct rpc_cred *cred;
1265 struct nfs4_state *state;
02a913a7 1266 struct dentry *res;
1da177e4
LT		 1267
1268 if (nd->flags & LOOKUP_CREATE) {
1269 attr.ia_mode = nd->intent.open.create_mode;
1270 attr.ia_valid = ATTR_MODE;
1271 if (!IS_POSIXACL(dir))
1272 attr.ia_mode &= ~current->fs->umask;
1273 } else {
1274 attr.ia_valid = 0;
1275 BUG_ON(nd->intent.open.flags & O_CREAT);
1276 }
1277
1f163415 1278 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1279 if (IS_ERR(cred))
02a913a7 1280 return (struct dentry *)cred;
1da177e4
LT		 1281 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1282 put_rpccred(cred);
02a913a7
TM		 1283 if (IS_ERR(state)) {
1284 if (PTR_ERR(state) == -ENOENT)
1285 d_add(dentry, NULL);
1286 return (struct dentry *)state;
1287 }
24ac23ab 1288 res = d_add_unique(dentry, igrab(state->inode));
02a913a7
TM		 1289 if (res != NULL)
1290 dentry = res;
1291 nfs4_intent_set_file(nd, dentry, state);
1292 return res;
1da177e4
LT		 1293}
1294
1295int
02a913a7 1296nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4
LT		 1297{
1298 struct rpc_cred *cred;
1299 struct nfs4_state *state;
1da177e4 1300
1f163415 1301 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1302 if (IS_ERR(cred))
1303 return PTR_ERR(cred);
1304 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1305 if (IS_ERR(state))
1306 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1307 put_rpccred(cred);
02a913a7
TM		 1308 if (IS_ERR(state)) {
1309 switch (PTR_ERR(state)) {
1310 case -EPERM:
1311 case -EACCES:
1312 case -EDQUOT:
1313 case -ENOSPC:
1314 case -EROFS:
1315 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1316 return 1;
b87c0adf
CL		 1317 default:
1318 goto out_drop;
02a913a7 1319 }
02a913a7 1320 }
24ac23ab 1321 if (state->inode == dentry->d_inode) {
02a913a7 1322 nfs4_intent_set_file(nd, dentry, state);
1da177e4
LT		 1323 return 1;
1324 }
1da177e4 1325 nfs4_close_state(state, openflags);
02a913a7
TM		 1326out_drop:
1327 d_drop(dentry);
1da177e4
LT		 1328 return 0;
1329}
1330
1331
1332static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1333{
1334 struct nfs4_server_caps_res res = {};
1335 struct rpc_message msg = {
1336 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1337 .rpc_argp = fhandle,
1338 .rpc_resp = &res,
1339 };
1340 int status;
1341
1342 status = rpc_call_sync(server->client, &msg, 0);
1343 if (status == 0) {
1344 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1345 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1346 server->caps |= NFS_CAP_ACLS;
1347 if (res.has_links != 0)
1348 server->caps |= NFS_CAP_HARDLINKS;
1349 if (res.has_symlinks != 0)
1350 server->caps |= NFS_CAP_SYMLINKS;
1351 server->acl_bitmask = res.acl_bitmask;
1352 }
1353 return status;
1354}
1355
55a97593 1356int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1357{
1358 struct nfs4_exception exception = { };
1359 int err;
1360 do {
1361 err = nfs4_handle_exception(server,
1362 _nfs4_server_capabilities(server, fhandle),
1363 &exception);
1364 } while (exception.retry);
1365 return err;
1366}
1367
1368static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1369 struct nfs_fsinfo *info)
1370{
1da177e4
LT		 1371 struct nfs4_lookup_root_arg args = {
1372 .bitmask = nfs4_fattr_bitmap,
1373 };
1374 struct nfs4_lookup_res res = {
1375 .server = server,
0e574af1 1376 .fattr = info->fattr,
1da177e4
LT		 1377 .fh = fhandle,
1378 };
1379 struct rpc_message msg = {
1380 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1381 .rpc_argp = &args,
1382 .rpc_resp = &res,
1383 };
0e574af1 1384 nfs_fattr_init(info->fattr);
1da177e4
LT		 1385 return rpc_call_sync(server->client, &msg, 0);
1386}
1387
1388static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1389 struct nfs_fsinfo *info)
1390{
1391 struct nfs4_exception exception = { };
1392 int err;
1393 do {
1394 err = nfs4_handle_exception(server,
1395 _nfs4_lookup_root(server, fhandle, info),
1396 &exception);
1397 } while (exception.retry);
1398 return err;
1399}
1400
54ceac45
DH		 1401/*
1402 * get the file handle for the "/" directory on the server
1403 */
1da177e4 1404static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1405 struct nfs_fsinfo *info)
1da177e4 1406{
1da177e4
LT		 1407 int status;
1408
1da177e4 1409 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1410 if (status == 0)
1411 status = nfs4_server_capabilities(server, fhandle);
1412 if (status == 0)
1413 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1414 return nfs4_map_errors(status);
1da177e4
LT		 1415}
1416
6b97fd3d
MN		 1417/*
1418 * Get locations and (maybe) other attributes of a referral.
1419 * Note that we'll actually follow the referral later when
1420 * we detect fsid mismatch in inode revalidation
1421 */
1422static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1423{
1424 int status = -ENOMEM;
1425 struct page *page = NULL;
1426 struct nfs4_fs_locations *locations = NULL;
1427 struct dentry dentry = {};
1428
1429 page = alloc_page(GFP_KERNEL);
1430 if (page == NULL)
1431 goto out;
1432 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1433 if (locations == NULL)
1434 goto out;
1435
1436 dentry.d_name.name = name->name;
1437 dentry.d_name.len = name->len;
1438 status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1439 if (status != 0)
1440 goto out;
1441 /* Make sure server returned a different fsid for the referral */
1442 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1443 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1444 status = -EIO;
1445 goto out;
1446 }
1447
1448 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1449 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1450 if (!fattr->mode)
1451 fattr->mode = S_IFDIR;
1452 memset(fhandle, 0, sizeof(struct nfs_fh));
1453out:
1454 if (page)
1455 __free_page(page);
1456 if (locations)
1457 kfree(locations);
1458 return status;
1459}
1460
1da177e4
LT		 1461static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1462{
1463 struct nfs4_getattr_arg args = {
1464 .fh = fhandle,
1465 .bitmask = server->attr_bitmask,
1466 };
1467 struct nfs4_getattr_res res = {
1468 .fattr = fattr,
1469 .server = server,
1470 };
1471 struct rpc_message msg = {
1472 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1473 .rpc_argp = &args,
1474 .rpc_resp = &res,
1475 };
1476
0e574af1 1477 nfs_fattr_init(fattr);
1da177e4
LT		 1478 return rpc_call_sync(server->client, &msg, 0);
1479}
1480
1481static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1482{
1483 struct nfs4_exception exception = { };
1484 int err;
1485 do {
1486 err = nfs4_handle_exception(server,
1487 _nfs4_proc_getattr(server, fhandle, fattr),
1488 &exception);
1489 } while (exception.retry);
1490 return err;
1491}
1492
1493/*
1494 * The file is not closed if it is opened due to the a request to change
1495 * the size of the file. The open call will not be needed once the
1496 * VFS layer lookup-intents are implemented.
1497 *
1498 * Close is called when the inode is destroyed.
1499 * If we haven't opened the file for O_WRONLY, we
1500 * need to in the size_change case to obtain a stateid.
1501 *
1502 * Got race?
1503 * Because OPEN is always done by name in nfsv4, it is
1504 * possible that we opened a different file by the same
1505 * name. We can recognize this race condition, but we
1506 * can't do anything about it besides returning an error.
1507 *
1508 * This will be fixed with VFS changes (lookup-intent).
1509 */
1510static int
1511nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1512 struct iattr *sattr)
1513{
08e9eac4
TM		 1514 struct rpc_cred *cred;
1515 struct inode *inode = dentry->d_inode;
d530838b
TM		 1516 struct nfs_open_context *ctx;
1517 struct nfs4_state *state = NULL;
1da177e4
LT		 1518 int status;
1519
0e574af1 1520 nfs_fattr_init(fattr);
1da177e4 1521
1f163415 1522 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1523 if (IS_ERR(cred))
1524 return PTR_ERR(cred);
d530838b
TM		 1525
1526 /* Search for an existing open(O_WRITE) file */
1527 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1528 if (ctx != NULL)
1529 state = ctx->state;
08e9eac4 1530
3e4f6290 1531 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1532 if (status == 0)
1533 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1534 if (ctx != NULL)
1535 put_nfs_open_context(ctx);
08e9eac4 1536 put_rpccred(cred);
1da177e4
LT		 1537 return status;
1538}
1539
2b3de441
DH		 1540static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1541 struct qstr *name, struct nfs_fh *fhandle,
1542 struct nfs_fattr *fattr)
1543{
1544 int status;
1545 struct nfs4_lookup_arg args = {
1546 .bitmask = server->attr_bitmask,
1547 .dir_fh = dirfh,
1548 .name = name,
1549 };
1550 struct nfs4_lookup_res res = {
1551 .server = server,
1552 .fattr = fattr,
1553 .fh = fhandle,
1554 };
1555 struct rpc_message msg = {
1556 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1557 .rpc_argp = &args,
1558 .rpc_resp = &res,
1559 };
1560
1561 nfs_fattr_init(fattr);
1562
1563 dprintk("NFS call lookupfh %s\n", name->name);
1564 status = rpc_call_sync(server->client, &msg, 0);
1565 dprintk("NFS reply lookupfh: %d\n", status);
1566 if (status == -NFS4ERR_MOVED)
1567 status = -EREMOTE;
1568 return status;
1569}
1570
1571static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1572 struct qstr *name, struct nfs_fh *fhandle,
1573 struct nfs_fattr *fattr)
1574{
1575 struct nfs4_exception exception = { };
1576 int err;
1577 do {
1578 err = nfs4_handle_exception(server,
1579 _nfs4_proc_lookupfh(server, dirfh, name,
1580 fhandle, fattr),
1581 &exception);
1582 } while (exception.retry);
1583 return err;
1584}
1585
1da177e4
LT		 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
1da177e4
LT		 1778/*
1779 * Got race?
1780 * We will need to arrange for the VFS layer to provide an atomic open.
1781 * Until then, this create/open method is prone to inefficiency and race
1782 * conditions due to the lookup, create, and open VFS calls from sys_open()
1783 * placed on the wire.
1784 *
1785 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1786 * The file will be opened again in the subsequent VFS open call
1787 * (nfs4_proc_file_open).
1788 *
1789 * The open for read will just hang around to be used by any process that
1790 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1791 */
1792
1793static int
1794nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1795 int flags, struct nameidata *nd)
1da177e4
LT		 1796{
1797 struct nfs4_state *state;
1798 struct rpc_cred *cred;
1799 int status = 0;
1800
1f163415 1801 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1802 if (IS_ERR(cred)) {
1803 status = PTR_ERR(cred);
1804 goto out;
1805 }
1806 state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1807 put_rpccred(cred);
1808 if (IS_ERR(state)) {
1809 status = PTR_ERR(state);
1810 goto out;
1811 }
24ac23ab 1812 d_instantiate(dentry, igrab(state->inode));
1da177e4
LT		 1813 if (flags & O_EXCL) {
1814 struct nfs_fattr fattr;
3e4f6290 1815 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1816 if (status == 0)
65e4308d 1817 nfs_setattr_update_inode(state->inode, sattr);
02a913a7
TM		 1818 }
1819 if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
95cf959b 1820 status = nfs4_intent_set_file(nd, dentry, state);
02a913a7
TM		 1821 else
1822 nfs4_close_state(state, flags);
1da177e4
LT		 1823out:
1824 return status;
1825}
1826
1827static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1828{
16e42959 1829 struct nfs_server *server = NFS_SERVER(dir);
1da177e4
LT		 1830 struct nfs4_remove_arg args = {
1831 .fh = NFS_FH(dir),
1832 .name = name,
16e42959
TM		 1833 .bitmask = server->attr_bitmask,
1834 };
1835 struct nfs_fattr dir_attr;
1836 struct nfs4_remove_res res = {
1837 .server = server,
1838 .dir_attr = &dir_attr,
1da177e4 1839 };
1da177e4
LT		 1840 struct rpc_message msg = {
1841 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1842 .rpc_argp = &args,
1843 .rpc_resp = &res,
1844 };
1845 int status;
1846
16e42959
TM		 1847 nfs_fattr_init(res.dir_attr);
1848 status = rpc_call_sync(server->client, &msg, 0);
1849 if (status == 0) {
1850 update_changeattr(dir, &res.cinfo);
1851 nfs_post_op_update_inode(dir, res.dir_attr);
1852 }
1da177e4
LT		 1853 return status;
1854}
1855
1856static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1857{
1858 struct nfs4_exception exception = { };
1859 int err;
1860 do {
1861 err = nfs4_handle_exception(NFS_SERVER(dir),
1862 _nfs4_proc_remove(dir, name),
1863 &exception);
1864 } while (exception.retry);
1865 return err;
1866}
1867
1868struct unlink_desc {
1869 struct nfs4_remove_arg args;
16e42959
TM		 1870 struct nfs4_remove_res res;
1871 struct nfs_fattr dir_attr;
1da177e4
LT		 1872};
1873
1874static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1875 struct qstr *name)
1876{
16e42959 1877 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1da177e4
LT		 1878 struct unlink_desc *up;
1879
1880 up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1881 if (!up)
1882 return -ENOMEM;
1883
1884 up->args.fh = NFS_FH(dir->d_inode);
1885 up->args.name = name;
16e42959
TM		 1886 up->args.bitmask = server->attr_bitmask;
1887 up->res.server = server;
1888 up->res.dir_attr = &up->dir_attr;
1da177e4
LT		 1889
1890 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1891 msg->rpc_argp = &up->args;
1892 msg->rpc_resp = &up->res;
1893 return 0;
1894}
1895
1896static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1897{
1898 struct rpc_message *msg = &task->tk_msg;
1899 struct unlink_desc *up;
1900
1901 if (msg->rpc_resp != NULL) {
1902 up = container_of(msg->rpc_resp, struct unlink_desc, res);
16e42959
TM		 1903 update_changeattr(dir->d_inode, &up->res.cinfo);
1904 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1da177e4
LT		 1905 kfree(up);
1906 msg->rpc_resp = NULL;
1907 msg->rpc_argp = NULL;
1908 }
1909 return 0;
1910}
1911
1912static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1913 struct inode *new_dir, struct qstr *new_name)
1914{
6caf2c82 1915 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1916 struct nfs4_rename_arg arg = {
1917 .old_dir = NFS_FH(old_dir),
1918 .new_dir = NFS_FH(new_dir),
1919 .old_name = old_name,
1920 .new_name = new_name,
6caf2c82
TM		 1921 .bitmask = server->attr_bitmask,
1922 };
1923 struct nfs_fattr old_fattr, new_fattr;
1924 struct nfs4_rename_res res = {
1925 .server = server,
1926 .old_fattr = &old_fattr,
1927 .new_fattr = &new_fattr,
1da177e4 1928 };
1da177e4
LT		 1929 struct rpc_message msg = {
1930 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1931 .rpc_argp = &arg,
1932 .rpc_resp = &res,
1933 };
1934 int status;
1935
6caf2c82
TM		 1936 nfs_fattr_init(res.old_fattr);
1937 nfs_fattr_init(res.new_fattr);
1938 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 1939
1940 if (!status) {
1941 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 1942 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 1943 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 1944 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 1945 }
1946 return status;
1947}
1948
1949static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1950 struct inode *new_dir, struct qstr *new_name)
1951{
1952 struct nfs4_exception exception = { };
1953 int err;
1954 do {
1955 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1956 _nfs4_proc_rename(old_dir, old_name,
1957 new_dir, new_name),
1958 &exception);
1959 } while (exception.retry);
1960 return err;
1961}
1962
1963static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1964{
91ba2eee 1965 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1966 struct nfs4_link_arg arg = {
1967 .fh = NFS_FH(inode),
1968 .dir_fh = NFS_FH(dir),
1969 .name = name,
91ba2eee
TM		 1970 .bitmask = server->attr_bitmask,
1971 };
1972 struct nfs_fattr fattr, dir_attr;
1973 struct nfs4_link_res res = {
1974 .server = server,
1975 .fattr = &fattr,
1976 .dir_attr = &dir_attr,
1da177e4 1977 };
1da177e4
LT		 1978 struct rpc_message msg = {
1979 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1980 .rpc_argp = &arg,
91ba2eee 1981 .rpc_resp = &res,
1da177e4
LT		 1982 };
1983 int status;
1984
91ba2eee
TM		 1985 nfs_fattr_init(res.fattr);
1986 nfs_fattr_init(res.dir_attr);
1987 status = rpc_call_sync(server->client, &msg, 0);
1988 if (!status) {
1989 update_changeattr(dir, &res.cinfo);
1990 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 1991 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 1992 }
1da177e4
LT		 1993
1994 return status;
1995}
1996
1997static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1998{
1999 struct nfs4_exception exception = { };
2000 int err;
2001 do {
2002 err = nfs4_handle_exception(NFS_SERVER(inode),
2003 _nfs4_proc_link(inode, dir, name),
2004 &exception);
2005 } while (exception.retry);
2006 return err;
2007}
2008
4f390c15 2009static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2010 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2011{
2012 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 2013 struct nfs_fh fhandle;
2014 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2015 struct nfs4_create_arg arg = {
2016 .dir_fh = NFS_FH(dir),
2017 .server = server,
4f390c15 2018 .name = &dentry->d_name,
1da177e4
LT		 2019 .attrs = sattr,
2020 .ftype = NF4LNK,
2021 .bitmask = server->attr_bitmask,
2022 };
2023 struct nfs4_create_res res = {
2024 .server = server,
4f390c15
CL		 2025 .fh = &fhandle,
2026 .fattr = &fattr,
56ae19f3 2027 .dir_fattr = &dir_fattr,
1da177e4
LT		 2028 };
2029 struct rpc_message msg = {
2030 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2031 .rpc_argp = &arg,
2032 .rpc_resp = &res,
2033 };
2034 int status;
2035
94a6d753 2036 if (len > NFS4_MAXPATHLEN)
1da177e4 2037 return -ENAMETOOLONG;
4f390c15 2038
94a6d753
CL		 2039 arg.u.symlink.pages = &page;
2040 arg.u.symlink.len = len;
4f390c15 2041 nfs_fattr_init(&fattr);
56ae19f3 2042 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2043
2044 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2045 if (!status) {
1da177e4 2046 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2047 nfs_post_op_update_inode(dir, res.dir_fattr);
2048 status = nfs_instantiate(dentry, &fhandle, &fattr);
2049 }
1da177e4
LT		 2050 return status;
2051}
2052
4f390c15 2053static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2054 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2055{
2056 struct nfs4_exception exception = { };
2057 int err;
2058 do {
2059 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2060 _nfs4_proc_symlink(dir, dentry, page,
2061 len, sattr),
1da177e4
LT		 2062 &exception);
2063 } while (exception.retry);
2064 return err;
2065}
2066
2067static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2068 struct iattr *sattr)
2069{
2070 struct nfs_server *server = NFS_SERVER(dir);
2071 struct nfs_fh fhandle;
56ae19f3 2072 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2073 struct nfs4_create_arg arg = {
2074 .dir_fh = NFS_FH(dir),
2075 .server = server,
2076 .name = &dentry->d_name,
2077 .attrs = sattr,
2078 .ftype = NF4DIR,
2079 .bitmask = server->attr_bitmask,
2080 };
2081 struct nfs4_create_res res = {
2082 .server = server,
2083 .fh = &fhandle,
2084 .fattr = &fattr,
56ae19f3 2085 .dir_fattr = &dir_fattr,
1da177e4
LT		 2086 };
2087 struct rpc_message msg = {
2088 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2089 .rpc_argp = &arg,
2090 .rpc_resp = &res,
2091 };
2092 int status;
2093
0e574af1 2094 nfs_fattr_init(&fattr);
56ae19f3 2095 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2096
2097 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2098 if (!status) {
2099 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2100 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2101 status = nfs_instantiate(dentry, &fhandle, &fattr);
2102 }
2103 return status;
2104}
2105
2106static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2107 struct iattr *sattr)
2108{
2109 struct nfs4_exception exception = { };
2110 int err;
2111 do {
2112 err = nfs4_handle_exception(NFS_SERVER(dir),
2113 _nfs4_proc_mkdir(dir, dentry, sattr),
2114 &exception);
2115 } while (exception.retry);
2116 return err;
2117}
2118
2119static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2120 u64 cookie, struct page *page, unsigned int count, int plus)
2121{
2122 struct inode *dir = dentry->d_inode;
2123 struct nfs4_readdir_arg args = {
2124 .fh = NFS_FH(dir),
2125 .pages = &page,
2126 .pgbase = 0,
2127 .count = count,
2128 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2129 };
2130 struct nfs4_readdir_res res;
2131 struct rpc_message msg = {
2132 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2133 .rpc_argp = &args,
2134 .rpc_resp = &res,
2135 .rpc_cred = cred,
2136 };
2137 int status;
2138
eadf4598
TM		 2139 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2140 dentry->d_parent->d_name.name,
2141 dentry->d_name.name,
2142 (unsigned long long)cookie);
1da177e4
LT		 2143 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2144 res.pgbase = args.pgbase;
2145 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2146 if (status == 0)
2147 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
eadf4598 2148 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2149 return status;
2150}
2151
2152static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2153 u64 cookie, struct page *page, unsigned int count, int plus)
2154{
2155 struct nfs4_exception exception = { };
2156 int err;
2157 do {
2158 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2159 _nfs4_proc_readdir(dentry, cred, cookie,
2160 page, count, plus),
2161 &exception);
2162 } while (exception.retry);
2163 return err;
2164}
2165
2166static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2167 struct iattr *sattr, dev_t rdev)
2168{
2169 struct nfs_server *server = NFS_SERVER(dir);
2170 struct nfs_fh fh;
56ae19f3 2171 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2172 struct nfs4_create_arg arg = {
2173 .dir_fh = NFS_FH(dir),
2174 .server = server,
2175 .name = &dentry->d_name,
2176 .attrs = sattr,
2177 .bitmask = server->attr_bitmask,
2178 };
2179 struct nfs4_create_res res = {
2180 .server = server,
2181 .fh = &fh,
2182 .fattr = &fattr,
56ae19f3 2183 .dir_fattr = &dir_fattr,
1da177e4
LT		 2184 };
2185 struct rpc_message msg = {
2186 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2187 .rpc_argp = &arg,
2188 .rpc_resp = &res,
2189 };
2190 int status;
2191 int mode = sattr->ia_mode;
2192
0e574af1 2193 nfs_fattr_init(&fattr);
56ae19f3 2194 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2195
2196 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2197 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2198 if (S_ISFIFO(mode))
2199 arg.ftype = NF4FIFO;
2200 else if (S_ISBLK(mode)) {
2201 arg.ftype = NF4BLK;
2202 arg.u.device.specdata1 = MAJOR(rdev);
2203 arg.u.device.specdata2 = MINOR(rdev);
2204 }
2205 else if (S_ISCHR(mode)) {
2206 arg.ftype = NF4CHR;
2207 arg.u.device.specdata1 = MAJOR(rdev);
2208 arg.u.device.specdata2 = MINOR(rdev);
2209 }
2210 else
2211 arg.ftype = NF4SOCK;
2212
2213 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2214 if (status == 0) {
2215 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2216 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2217 status = nfs_instantiate(dentry, &fh, &fattr);
2218 }
2219 return status;
2220}
2221
2222static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2223 struct iattr *sattr, dev_t rdev)
2224{
2225 struct nfs4_exception exception = { };
2226 int err;
2227 do {
2228 err = nfs4_handle_exception(NFS_SERVER(dir),
2229 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2230 &exception);
2231 } while (exception.retry);
2232 return err;
2233}
2234
2235static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2236 struct nfs_fsstat *fsstat)
2237{
2238 struct nfs4_statfs_arg args = {
2239 .fh = fhandle,
2240 .bitmask = server->attr_bitmask,
2241 };
2242 struct rpc_message msg = {
2243 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2244 .rpc_argp = &args,
2245 .rpc_resp = fsstat,
2246 };
2247
0e574af1 2248 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2249 return rpc_call_sync(server->client, &msg, 0);
2250}
2251
2252static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2253{
2254 struct nfs4_exception exception = { };
2255 int err;
2256 do {
2257 err = nfs4_handle_exception(server,
2258 _nfs4_proc_statfs(server, fhandle, fsstat),
2259 &exception);
2260 } while (exception.retry);
2261 return err;
2262}
2263
2264static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2265 struct nfs_fsinfo *fsinfo)
2266{
2267 struct nfs4_fsinfo_arg args = {
2268 .fh = fhandle,
2269 .bitmask = server->attr_bitmask,
2270 };
2271 struct rpc_message msg = {
2272 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2273 .rpc_argp = &args,
2274 .rpc_resp = fsinfo,
2275 };
2276
2277 return rpc_call_sync(server->client, &msg, 0);
2278}
2279
2280static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2281{
2282 struct nfs4_exception exception = { };
2283 int err;
2284
2285 do {
2286 err = nfs4_handle_exception(server,
2287 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2288 &exception);
2289 } while (exception.retry);
2290 return err;
2291}
2292
2293static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2294{
0e574af1 2295 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2296 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2297}
2298
2299static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2300 struct nfs_pathconf *pathconf)
2301{
2302 struct nfs4_pathconf_arg args = {
2303 .fh = fhandle,
2304 .bitmask = server->attr_bitmask,
2305 };
2306 struct rpc_message msg = {
2307 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2308 .rpc_argp = &args,
2309 .rpc_resp = pathconf,
2310 };
2311
2312 /* None of the pathconf attributes are mandatory to implement */
2313 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2314 memset(pathconf, 0, sizeof(*pathconf));
2315 return 0;
2316 }
2317
0e574af1 2318 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2319 return rpc_call_sync(server->client, &msg, 0);
2320}
2321
2322static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2323 struct nfs_pathconf *pathconf)
2324{
2325 struct nfs4_exception exception = { };
2326 int err;
2327
2328 do {
2329 err = nfs4_handle_exception(server,
2330 _nfs4_proc_pathconf(server, fhandle, pathconf),
2331 &exception);
2332 } while (exception.retry);
2333 return err;
2334}
2335
ec06c096 2336static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2337{
ec06c096 2338 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2339
ec06c096 2340 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2341 rpc_restart_call(task);
ec06c096 2342 return -EAGAIN;
1da177e4
LT		 2343 }
2344 if (task->tk_status > 0)
ec06c096
TM		 2345 renew_lease(server, data->timestamp);
2346 return 0;
1da177e4
LT		 2347}
2348
ec06c096 2349static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2350{
1da177e4
LT		 2351 struct rpc_message msg = {
2352 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2353 .rpc_argp = &data->args,
2354 .rpc_resp = &data->res,
2355 .rpc_cred = data->cred,
2356 };
1da177e4
LT		 2357
2358 data->timestamp = jiffies;
2359
ec06c096 2360 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2361}
2362
788e7a89 2363static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2364{
1da177e4
LT		 2365 struct inode *inode = data->inode;
2366
2367 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2368 rpc_restart_call(task);
788e7a89 2369 return -EAGAIN;
1da177e4 2370 }
4f9838c7 2371 if (task->tk_status >= 0) {
1da177e4 2372 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2373 nfs_post_op_update_inode(inode, data->res.fattr);
2374 }
788e7a89 2375 return 0;
1da177e4
LT		 2376}
2377
788e7a89 2378static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2379{
1da177e4
LT		 2380 struct rpc_message msg = {
2381 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2382 .rpc_argp = &data->args,
2383 .rpc_resp = &data->res,
2384 .rpc_cred = data->cred,
2385 };
2386 struct inode *inode = data->inode;
4f9838c7 2387 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2388 int stable;
1da177e4
LT		 2389
2390 if (how & FLUSH_STABLE) {
2391 if (!NFS_I(inode)->ncommit)
2392 stable = NFS_FILE_SYNC;
2393 else
2394 stable = NFS_DATA_SYNC;
2395 } else
2396 stable = NFS_UNSTABLE;
2397 data->args.stable = stable;
4f9838c7
TM		 2398 data->args.bitmask = server->attr_bitmask;
2399 data->res.server = server;
1da177e4
LT		 2400
2401 data->timestamp = jiffies;
2402
1da177e4 2403 /* Finalize the task. */
788e7a89 2404 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2405}
2406
788e7a89 2407static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2408{
1da177e4
LT		 2409 struct inode *inode = data->inode;
2410
2411 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2412 rpc_restart_call(task);
788e7a89 2413 return -EAGAIN;
1da177e4 2414 }
4f9838c7
TM		 2415 if (task->tk_status >= 0)
2416 nfs_post_op_update_inode(inode, data->res.fattr);
788e7a89 2417 return 0;
1da177e4
LT		 2418}
2419
788e7a89 2420static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2421{
1da177e4
LT		 2422 struct rpc_message msg = {
2423 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2424 .rpc_argp = &data->args,
2425 .rpc_resp = &data->res,
2426 .rpc_cred = data->cred,
2427 };
788e7a89 2428 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2429
4f9838c7
TM		 2430 data->args.bitmask = server->attr_bitmask;
2431 data->res.server = server;
2432
788e7a89 2433 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2434}
2435
2436/*
2437 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2438 * standalone procedure for queueing an asynchronous RENEW.
2439 */
963d8fe5 2440static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2441{
adfa6f98 2442 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2443 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2444
2445 if (task->tk_status < 0) {
2446 switch (task->tk_status) {
2447 case -NFS4ERR_STALE_CLIENTID:
2448 case -NFS4ERR_EXPIRED:
2449 case -NFS4ERR_CB_PATH_DOWN:
2450 nfs4_schedule_state_recovery(clp);
2451 }
2452 return;
2453 }
2454 spin_lock(&clp->cl_lock);
2455 if (time_before(clp->cl_last_renewal,timestamp))
2456 clp->cl_last_renewal = timestamp;
2457 spin_unlock(&clp->cl_lock);
2458}
2459
963d8fe5
TM		 2460static const struct rpc_call_ops nfs4_renew_ops = {
2461 .rpc_call_done = nfs4_renew_done,
2462};
2463
adfa6f98 2464int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2465{
2466 struct rpc_message msg = {
2467 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2468 .rpc_argp = clp,
b4454fe1 2469 .rpc_cred = cred,
1da177e4
LT		 2470 };
2471
2472 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2473 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2474}
2475
adfa6f98 2476int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2477{
2478 struct rpc_message msg = {
2479 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2480 .rpc_argp = clp,
b4454fe1 2481 .rpc_cred = cred,
1da177e4
LT		 2482 };
2483 unsigned long now = jiffies;
2484 int status;
2485
2486 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2487 if (status < 0)
2488 return status;
2489 spin_lock(&clp->cl_lock);
2490 if (time_before(clp->cl_last_renewal,now))
2491 clp->cl_last_renewal = now;
2492 spin_unlock(&clp->cl_lock);
2493 return 0;
2494}
2495
aa1870af
BF		 2496static inline int nfs4_server_supports_acls(struct nfs_server *server)
2497{
2498 return (server->caps & NFS_CAP_ACLS)
2499 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2500 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2501}
2502
2503/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2504 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2505 * the stack.
2506 */
2507#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2508
2509static void buf_to_pages(const void *buf, size_t buflen,
2510 struct page **pages, unsigned int *pgbase)
2511{
2512 const void *p = buf;
2513
2514 *pgbase = offset_in_page(buf);
2515 p -= *pgbase;
2516 while (p < buf + buflen) {
2517 *(pages++) = virt_to_page(p);
2518 p += PAGE_CACHE_SIZE;
2519 }
2520}
2521
e50a1c2e
BF		 2522struct nfs4_cached_acl {
2523 int cached;
2524 size_t len;
3e9d4154 2525 char data[0];
e50a1c2e
BF		 2526};
2527
2528static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2529{
2530 struct nfs_inode *nfsi = NFS_I(inode);
2531
2532 spin_lock(&inode->i_lock);
2533 kfree(nfsi->nfs4_acl);
2534 nfsi->nfs4_acl = acl;
2535 spin_unlock(&inode->i_lock);
2536}
2537
2538static void nfs4_zap_acl_attr(struct inode *inode)
2539{
2540 nfs4_set_cached_acl(inode, NULL);
2541}
2542
2543static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2544{
2545 struct nfs_inode *nfsi = NFS_I(inode);
2546 struct nfs4_cached_acl *acl;
2547 int ret = -ENOENT;
2548
2549 spin_lock(&inode->i_lock);
2550 acl = nfsi->nfs4_acl;
2551 if (acl == NULL)
2552 goto out;
2553 if (buf == NULL) /* user is just asking for length */
2554 goto out_len;
2555 if (acl->cached == 0)
2556 goto out;
2557 ret = -ERANGE; /* see getxattr(2) man page */
2558 if (acl->len > buflen)
2559 goto out;
2560 memcpy(buf, acl->data, acl->len);
2561out_len:
2562 ret = acl->len;
2563out:
2564 spin_unlock(&inode->i_lock);
2565 return ret;
2566}
2567
2568static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2569{
2570 struct nfs4_cached_acl *acl;
2571
2572 if (buf && acl_len <= PAGE_SIZE) {
2573 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2574 if (acl == NULL)
2575 goto out;
2576 acl->cached = 1;
2577 memcpy(acl->data, buf, acl_len);
2578 } else {
2579 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2580 if (acl == NULL)
2581 goto out;
2582 acl->cached = 0;
2583 }
2584 acl->len = acl_len;
2585out:
2586 nfs4_set_cached_acl(inode, acl);
2587}
2588
16b4289c 2589static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2590{
aa1870af
BF		 2591 struct page *pages[NFS4ACL_MAXPAGES];
2592 struct nfs_getaclargs args = {
2593 .fh = NFS_FH(inode),
2594 .acl_pages = pages,
2595 .acl_len = buflen,
2596 };
2597 size_t resp_len = buflen;
e50a1c2e 2598 void *resp_buf;
aa1870af
BF		 2599 struct rpc_message msg = {
2600 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2601 .rpc_argp = &args,
2602 .rpc_resp = &resp_len,
2603 };
e50a1c2e 2604 struct page *localpage = NULL;
aa1870af
BF		 2605 int ret;
2606
e50a1c2e
BF		 2607 if (buflen < PAGE_SIZE) {
2608 /* As long as we're doing a round trip to the server anyway,
2609 * let's be prepared for a page of acl data. */
2610 localpage = alloc_page(GFP_KERNEL);
2611 resp_buf = page_address(localpage);
2612 if (localpage == NULL)
2613 return -ENOMEM;
2614 args.acl_pages[0] = localpage;
2615 args.acl_pgbase = 0;
1d95db8e 2616 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2617 } else {
2618 resp_buf = buf;
2619 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2620 }
aa1870af 2621 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2622 if (ret)
2623 goto out_free;
2624 if (resp_len > args.acl_len)
2625 nfs4_write_cached_acl(inode, NULL, resp_len);
2626 else
2627 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2628 if (buf) {
2629 ret = -ERANGE;
2630 if (resp_len > buflen)
2631 goto out_free;
2632 if (localpage)
2633 memcpy(buf, resp_buf, resp_len);
2634 }
2635 ret = resp_len;
2636out_free:
2637 if (localpage)
2638 __free_page(localpage);
aa1870af
BF		 2639 return ret;
2640}
2641
16b4289c
TM		 2642static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2643{
2644 struct nfs4_exception exception = { };
2645 ssize_t ret;
2646 do {
2647 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2648 if (ret >= 0)
2649 break;
2650 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2651 } while (exception.retry);
2652 return ret;
2653}
2654
e50a1c2e
BF		 2655static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2656{
2657 struct nfs_server *server = NFS_SERVER(inode);
2658 int ret;
2659
2660 if (!nfs4_server_supports_acls(server))
2661 return -EOPNOTSUPP;
2662 ret = nfs_revalidate_inode(server, inode);
2663 if (ret < 0)
2664 return ret;
2665 ret = nfs4_read_cached_acl(inode, buf, buflen);
2666 if (ret != -ENOENT)
2667 return ret;
2668 return nfs4_get_acl_uncached(inode, buf, buflen);
2669}
2670
16b4289c 2671static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2672{
2673 struct nfs_server *server = NFS_SERVER(inode);
2674 struct page *pages[NFS4ACL_MAXPAGES];
2675 struct nfs_setaclargs arg = {
2676 .fh = NFS_FH(inode),
2677 .acl_pages = pages,
2678 .acl_len = buflen,
2679 };
2680 struct rpc_message msg = {
2681 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2682 .rpc_argp = &arg,
2683 .rpc_resp = NULL,
2684 };
2685 int ret;
2686
2687 if (!nfs4_server_supports_acls(server))
2688 return -EOPNOTSUPP;
642ac549 2689 nfs_inode_return_delegation(inode);
4b580ee3 2690 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2691 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2692 if (ret == 0)
2693 nfs4_write_cached_acl(inode, buf, buflen);
4b580ee3
BF		 2694 return ret;
2695}
2696
16b4289c
TM		 2697static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2698{
2699 struct nfs4_exception exception = { };
2700 int err;
2701 do {
2702 err = nfs4_handle_exception(NFS_SERVER(inode),
2703 __nfs4_proc_set_acl(inode, buf, buflen),
2704 &exception);
2705 } while (exception.retry);
2706 return err;
2707}
2708
1da177e4 2709static int
faf5f49c 2710nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2711{
7539bbab 2712 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2713
2714 if (!clp || task->tk_status >= 0)
2715 return 0;
2716 switch(task->tk_status) {
2717 case -NFS4ERR_STALE_CLIENTID:
2718 case -NFS4ERR_STALE_STATEID:
2719 case -NFS4ERR_EXPIRED:
2720 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2721 nfs4_schedule_state_recovery(clp);
433fbe4c 2722 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2723 rpc_wake_up_task(task);
2724 task->tk_status = 0;
2725 return -EAGAIN;
1da177e4 2726 case -NFS4ERR_DELAY:
006ea73e
CL		 2727 nfs_inc_server_stats((struct nfs_server *) server,
2728 NFSIOS_DELAY);
2729 case -NFS4ERR_GRACE:
1da177e4
LT		 2730 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2731 task->tk_status = 0;
2732 return -EAGAIN;
2733 case -NFS4ERR_OLD_STATEID:
2734 task->tk_status = 0;
2735 return -EAGAIN;
2736 }
2737 task->tk_status = nfs4_map_errors(task->tk_status);
2738 return 0;
2739}
2740
433fbe4c
TM		 2741static int nfs4_wait_bit_interruptible(void *word)
2742{
2743 if (signal_pending(current))
2744 return -ERESTARTSYS;
2745 schedule();
2746 return 0;
2747}
2748
adfa6f98 2749static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2750{
1da177e4 2751 sigset_t oldset;
433fbe4c 2752 int res;
1da177e4
LT		 2753
2754 might_sleep();
2755
2756 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2757 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2758 nfs4_wait_bit_interruptible,
2759 TASK_INTERRUPTIBLE);
1da177e4
LT		 2760 rpc_clnt_sigunmask(clnt, &oldset);
2761 return res;
2762}
2763
2764static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2765{
2766 sigset_t oldset;
2767 int res = 0;
2768
2769 might_sleep();
2770
2771 if (*timeout <= 0)
2772 *timeout = NFS4_POLL_RETRY_MIN;
2773 if (*timeout > NFS4_POLL_RETRY_MAX)
2774 *timeout = NFS4_POLL_RETRY_MAX;
2775 rpc_clnt_sigmask(clnt, &oldset);
2776 if (clnt->cl_intr) {
041e0e3b 2777 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2778 if (signalled())
2779 res = -ERESTARTSYS;
041e0e3b
NA		 2780 } else
2781 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2782 rpc_clnt_sigunmask(clnt, &oldset);
2783 *timeout <<= 1;
2784 return res;
2785}
2786
2787/* This is the error handling routine for processes that are allowed
2788 * to sleep.
2789 */
faf5f49c 2790int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2791{
7539bbab 2792 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2793 int ret = errorcode;
2794
2795 exception->retry = 0;
2796 switch(errorcode) {
2797 case 0:
2798 return 0;
2799 case -NFS4ERR_STALE_CLIENTID:
2800 case -NFS4ERR_STALE_STATEID:
2801 case -NFS4ERR_EXPIRED:
433fbe4c 2802 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2803 ret = nfs4_wait_clnt_recover(server->client, clp);
2804 if (ret == 0)
2805 exception->retry = 1;
2806 break;
c514983d 2807 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2808 case -NFS4ERR_GRACE:
2809 case -NFS4ERR_DELAY:
2810 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2811 if (ret != 0)
2812 break;
1da177e4 2813 case -NFS4ERR_OLD_STATEID:
2c56617d 2814 exception->retry = 1;
1da177e4
LT		 2815 }
2816 /* We failed to handle the error */
2817 return nfs4_map_errors(ret);
2818}
2819
adfa6f98 2820int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2821{
2822 nfs4_verifier sc_verifier;
2823 struct nfs4_setclientid setclientid = {
2824 .sc_verifier = &sc_verifier,
2825 .sc_prog = program,
2826 };
2827 struct rpc_message msg = {
2828 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2829 .rpc_argp = &setclientid,
2830 .rpc_resp = clp,
286d7d6a 2831 .rpc_cred = cred,
1da177e4 2832 };
bc4785cd 2833 __be32 *p;
1da177e4
LT		 2834 int loop = 0;
2835 int status;
2836
bc4785cd 2837 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2838 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2839 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2840
2841 for(;;) {
2842 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2843 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2844 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2845 cred->cr_ops->cr_name,
1da177e4
LT		 2846 clp->cl_id_uniquifier);
2847 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2848 sizeof(setclientid.sc_netid), "tcp");
2849 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2850 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2851 clp->cl_ipaddr, port >> 8, port & 255);
2852
2853 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2854 if (status != -NFS4ERR_CLID_INUSE)
2855 break;
2856 if (signalled())
2857 break;
2858 if (loop++ & 1)
2859 ssleep(clp->cl_lease_time + 1);
2860 else
2861 if (++clp->cl_id_uniquifier == 0)
2862 break;
2863 }
2864 return status;
2865}
2866
adfa6f98 2867static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2868{
2869 struct nfs_fsinfo fsinfo;
2870 struct rpc_message msg = {
2871 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2872 .rpc_argp = clp,
2873 .rpc_resp = &fsinfo,
286d7d6a 2874 .rpc_cred = cred,
1da177e4
LT		 2875 };
2876 unsigned long now;
2877 int status;
2878
2879 now = jiffies;
2880 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2881 if (status == 0) {
2882 spin_lock(&clp->cl_lock);
2883 clp->cl_lease_time = fsinfo.lease_time * HZ;
2884 clp->cl_last_renewal = now;
58d9714a 2885 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2886 spin_unlock(&clp->cl_lock);
2887 }
2888 return status;
2889}
2890
adfa6f98 2891int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2892{
2893 long timeout;
2894 int err;
2895 do {
2896 err = _nfs4_proc_setclientid_confirm(clp, cred);
2897 switch (err) {
2898 case 0:
2899 return err;
2900 case -NFS4ERR_RESOURCE:
2901 /* The IBM lawyers misread another document! */
2902 case -NFS4ERR_DELAY:
2903 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2904 }
2905 } while (err == 0);
2906 return err;
2907}
2908
fe650407
TM		 2909struct nfs4_delegreturndata {
2910 struct nfs4_delegreturnargs args;
fa178f29 2911 struct nfs4_delegreturnres res;
fe650407
TM		 2912 struct nfs_fh fh;
2913 nfs4_stateid stateid;
2914 struct rpc_cred *cred;
26e976a8 2915 unsigned long timestamp;
fa178f29 2916 struct nfs_fattr fattr;
fe650407
TM		 2917 int rpc_status;
2918};
2919
2920static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 2921{
fe650407 2922 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 2923 struct rpc_message msg = {
2924 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 2925 .rpc_argp = &data->args,
fa178f29 2926 .rpc_resp = &data->res,
fe650407 2927 .rpc_cred = data->cred,
1da177e4 2928 };
fa178f29 2929 nfs_fattr_init(data->res.fattr);
fe650407
TM		 2930 rpc_call_setup(task, &msg, 0);
2931}
1da177e4 2932
fe650407
TM		 2933static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2934{
2935 struct nfs4_delegreturndata *data = calldata;
2936 data->rpc_status = task->tk_status;
26e976a8 2937 if (data->rpc_status == 0)
fa178f29 2938 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2939}
2940
2941static void nfs4_delegreturn_release(void *calldata)
2942{
2943 struct nfs4_delegreturndata *data = calldata;
2944
2945 put_rpccred(data->cred);
2946 kfree(calldata);
2947}
2948
c8d149f3 2949static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 2950 .rpc_call_prepare = nfs4_delegreturn_prepare,
2951 .rpc_call_done = nfs4_delegreturn_done,
2952 .rpc_release = nfs4_delegreturn_release,
2953};
2954
2955static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2956{
2957 struct nfs4_delegreturndata *data;
fa178f29 2958 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 2959 struct rpc_task *task;
2960 int status;
2961
2962 data = kmalloc(sizeof(*data), GFP_KERNEL);
2963 if (data == NULL)
2964 return -ENOMEM;
2965 data->args.fhandle = &data->fh;
2966 data->args.stateid = &data->stateid;
fa178f29 2967 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 2968 nfs_copy_fh(&data->fh, NFS_FH(inode));
2969 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 2970 data->res.fattr = &data->fattr;
2971 data->res.server = server;
fe650407 2972 data->cred = get_rpccred(cred);
26e976a8 2973 data->timestamp = jiffies;
fe650407
TM		 2974 data->rpc_status = 0;
2975
2976 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 2977 if (IS_ERR(task))
fe650407 2978 return PTR_ERR(task);
fe650407 2979 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 2980 if (status == 0) {
fe650407 2981 status = data->rpc_status;
fa178f29
TM		 2982 if (status == 0)
2983 nfs_post_op_update_inode(inode, &data->fattr);
2984 }
e6b3c4db 2985 rpc_put_task(task);
fe650407 2986 return status;
1da177e4
LT		 2987}
2988
2989int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2990{
2991 struct nfs_server *server = NFS_SERVER(inode);
2992 struct nfs4_exception exception = { };
2993 int err;
2994 do {
2995 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2996 switch (err) {
2997 case -NFS4ERR_STALE_STATEID:
2998 case -NFS4ERR_EXPIRED:
7539bbab 2999 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 3000 case 0:
3001 return 0;
3002 }
3003 err = nfs4_handle_exception(server, err, &exception);
3004 } while (exception.retry);
3005 return err;
3006}
3007
3008#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3009#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3010
3011/*
3012 * sleep, with exponential backoff, and retry the LOCK operation.
3013 */
3014static unsigned long
3015nfs4_set_lock_task_retry(unsigned long timeout)
3016{
041e0e3b 3017 schedule_timeout_interruptible(timeout);
1da177e4
LT		 3018 timeout <<= 1;
3019 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3020 return NFS4_LOCK_MAXTIMEOUT;
3021 return timeout;
3022}
3023
1da177e4
LT		 3024static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3025{
3026 struct inode *inode = state->inode;
3027 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3028 struct nfs_client *clp = server->nfs_client;
911d1aaf 3029 struct nfs_lockt_args arg = {
1da177e4 3030 .fh = NFS_FH(inode),
911d1aaf 3031 .fl = request,
1da177e4 3032 };
911d1aaf
TM		 3033 struct nfs_lockt_res res = {
3034 .denied = request,
1da177e4
LT		 3035 };
3036 struct rpc_message msg = {
3037 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3038 .rpc_argp = &arg,
3039 .rpc_resp = &res,
3040 .rpc_cred = state->owner->so_cred,
3041 };
1da177e4
LT		 3042 struct nfs4_lock_state *lsp;
3043 int status;
3044
3045 down_read(&clp->cl_sem);
911d1aaf 3046 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3047 status = nfs4_set_lock_state(state, request);
3048 if (status != 0)
3049 goto out;
3050 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3051 arg.lock_owner.id = lsp->ls_id;
1da177e4 3052 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3053 switch (status) {
3054 case 0:
3055 request->fl_type = F_UNLCK;
3056 break;
3057 case -NFS4ERR_DENIED:
3058 status = 0;
1da177e4 3059 }
8d0a8a9d 3060out:
1da177e4
LT		 3061 up_read(&clp->cl_sem);
3062 return status;
3063}
3064
3065static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3066{
3067 struct nfs4_exception exception = { };
3068 int err;
3069
3070 do {
3071 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3072 _nfs4_proc_getlk(state, cmd, request),
3073 &exception);
3074 } while (exception.retry);
3075 return err;
3076}
3077
3078static int do_vfs_lock(struct file *file, struct file_lock *fl)
3079{
3080 int res = 0;
3081 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3082 case FL_POSIX:
3083 res = posix_lock_file_wait(file, fl);
3084 break;
3085 case FL_FLOCK:
3086 res = flock_lock_file_wait(file, fl);
3087 break;
3088 default:
3089 BUG();
3090 }
1da177e4
LT		 3091 return res;
3092}
3093
faf5f49c 3094struct nfs4_unlockdata {
911d1aaf
TM		 3095 struct nfs_locku_args arg;
3096 struct nfs_locku_res res;
faf5f49c
TM		 3097 struct nfs4_lock_state *lsp;
3098 struct nfs_open_context *ctx;
911d1aaf
TM		 3099 struct file_lock fl;
3100 const struct nfs_server *server;
26e976a8 3101 unsigned long timestamp;
faf5f49c
TM		 3102};
3103
911d1aaf
TM		 3104static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3105 struct nfs_open_context *ctx,
3106 struct nfs4_lock_state *lsp,
3107 struct nfs_seqid *seqid)
3108{
3109 struct nfs4_unlockdata *p;
3110 struct inode *inode = lsp->ls_state->inode;
3111
3112 p = kmalloc(sizeof(*p), GFP_KERNEL);
3113 if (p == NULL)
3114 return NULL;
3115 p->arg.fh = NFS_FH(inode);
3116 p->arg.fl = &p->fl;
3117 p->arg.seqid = seqid;
3118 p->arg.stateid = &lsp->ls_stateid;
3119 p->lsp = lsp;
3120 atomic_inc(&lsp->ls_count);
3121 /* Ensure we don't close file until we're done freeing locks! */
3122 p->ctx = get_nfs_open_context(ctx);
3123 memcpy(&p->fl, fl, sizeof(p->fl));
3124 p->server = NFS_SERVER(inode);
3125 return p;
3126}
3127
06f814a3 3128static void nfs4_locku_release_calldata(void *data)
faf5f49c 3129{
963d8fe5 3130 struct nfs4_unlockdata *calldata = data;
911d1aaf 3131 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3132 nfs4_put_lock_state(calldata->lsp);
3133 put_nfs_open_context(calldata->ctx);
3134 kfree(calldata);
faf5f49c
TM		 3135}
3136
963d8fe5 3137static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3138{
963d8fe5 3139 struct nfs4_unlockdata *calldata = data;
faf5f49c 3140
06f814a3
TM		 3141 if (RPC_ASSASSINATED(task))
3142 return;
911d1aaf 3143 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3144 switch (task->tk_status) {
3145 case 0:
3146 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3147 calldata->res.stateid.data,
faf5f49c 3148 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3149 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3150 break;
3151 case -NFS4ERR_STALE_STATEID:
3152 case -NFS4ERR_EXPIRED:
7539bbab 3153 nfs4_schedule_state_recovery(calldata->server->nfs_client);
faf5f49c
TM		 3154 break;
3155 default:
911d1aaf 3156 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
faf5f49c 3157 rpc_restart_call(task);
faf5f49c
TM		 3158 }
3159 }
faf5f49c
TM		 3160}
3161
4ce70ada 3162static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3163{
4ce70ada 3164 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3165 struct rpc_message msg = {
3166 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3167 .rpc_argp = &calldata->arg,
3168 .rpc_resp = &calldata->res,
3169 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3170 };
faf5f49c 3171
911d1aaf 3172 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3173 return;
3174 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3175 /* Note: exit _without_ running nfs4_locku_done */
3176 task->tk_action = NULL;
faf5f49c
TM		 3177 return;
3178 }
26e976a8 3179 calldata->timestamp = jiffies;
faf5f49c
TM		 3180 rpc_call_setup(task, &msg, 0);
3181}
3182
963d8fe5 3183static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3184 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3185 .rpc_call_done = nfs4_locku_done,
06f814a3 3186 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3187};
3188
a5d16a4d
TM		 3189static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3190 struct nfs_open_context *ctx,
3191 struct nfs4_lock_state *lsp,
3192 struct nfs_seqid *seqid)
3193{
3194 struct nfs4_unlockdata *data;
a5d16a4d
TM		 3195
3196 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3197 if (data == NULL) {
3198 nfs_free_seqid(seqid);
3199 return ERR_PTR(-ENOMEM);
3200 }
3201
7a1218a2 3202 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3203}
3204
faf5f49c
TM		 3205static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3206{
911d1aaf 3207 struct nfs_seqid *seqid;
1da177e4 3208 struct nfs4_lock_state *lsp;
06f814a3
TM		 3209 struct rpc_task *task;
3210 int status = 0;
faf5f49c 3211
8d0a8a9d 3212 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3213 /* Unlock _before_ we do the RPC call */
3214 request->fl_flags |= FL_EXISTS;
3215 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3216 goto out;
8d0a8a9d 3217 if (status != 0)
9b073574
TM		 3218 goto out;
3219 /* Is this a delegated lock? */
3220 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3221 goto out;
8d0a8a9d 3222 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3223 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3224 status = -ENOMEM;
911d1aaf 3225 if (seqid == NULL)
9b073574 3226 goto out;
a5d16a4d
TM		 3227 task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3228 status = PTR_ERR(task);
3229 if (IS_ERR(task))
9b073574 3230 goto out;
a5d16a4d 3231 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3232 rpc_put_task(task);
9b073574 3233out:
1da177e4
LT		 3234 return status;
3235}
3236
a5d16a4d
TM		 3237struct nfs4_lockdata {
3238 struct nfs_lock_args arg;
3239 struct nfs_lock_res res;
3240 struct nfs4_lock_state *lsp;
3241 struct nfs_open_context *ctx;
3242 struct file_lock fl;
26e976a8 3243 unsigned long timestamp;
a5d16a4d
TM		 3244 int rpc_status;
3245 int cancelled;
3246};
3247
3248static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3249 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3250{
a5d16a4d
TM		 3251 struct nfs4_lockdata *p;
3252 struct inode *inode = lsp->ls_state->inode;
1da177e4 3253 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3254
3255 p = kzalloc(sizeof(*p), GFP_KERNEL);
3256 if (p == NULL)
3257 return NULL;
3258
3259 p->arg.fh = NFS_FH(inode);
3260 p->arg.fl = &p->fl;
3261 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3262 if (p->arg.lock_seqid == NULL)
3263 goto out_free;
3264 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3265 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
a5d16a4d
TM		 3266 p->arg.lock_owner.id = lsp->ls_id;
3267 p->lsp = lsp;
3268 atomic_inc(&lsp->ls_count);
3269 p->ctx = get_nfs_open_context(ctx);
3270 memcpy(&p->fl, fl, sizeof(p->fl));
3271 return p;
3272out_free:
3273 kfree(p);
3274 return NULL;
3275}
3276
3277static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3278{
3279 struct nfs4_lockdata *data = calldata;
3280 struct nfs4_state *state = data->lsp->ls_state;
3281 struct nfs4_state_owner *sp = state->owner;
1da177e4 3282 struct rpc_message msg = {
a5d16a4d
TM		 3283 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3284 .rpc_argp = &data->arg,
3285 .rpc_resp = &data->res,
3286 .rpc_cred = sp->so_cred,
1da177e4 3287 };
06735b34 3288
a5d16a4d
TM		 3289 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3290 return;
3291 dprintk("%s: begin!\n", __FUNCTION__);
3292 /* Do we need to do an open_to_lock_owner? */
3293 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3294 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3295 if (data->arg.open_seqid == NULL) {
3296 data->rpc_status = -ENOMEM;
3297 task->tk_action = NULL;
06735b34 3298 goto out;
8d0a8a9d 3299 }
a5d16a4d
TM		 3300 data->arg.open_stateid = &state->stateid;
3301 data->arg.new_lock_owner = 1;
3302 }
26e976a8 3303 data->timestamp = jiffies;
a5d16a4d 3304 rpc_call_setup(task, &msg, 0);
06735b34 3305out:
a5d16a4d
TM		 3306 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3307}
3308
3309static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3310{
3311 struct nfs4_lockdata *data = calldata;
3312
3313 dprintk("%s: begin!\n", __FUNCTION__);
3314
3315 data->rpc_status = task->tk_status;
3316 if (RPC_ASSASSINATED(task))
3317 goto out;
3318 if (data->arg.new_lock_owner != 0) {
3319 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3320 if (data->rpc_status == 0)
3321 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3322 else
3323 goto out;
3324 }
3325 if (data->rpc_status == 0) {
3326 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3327 sizeof(data->lsp->ls_stateid.data));
3328 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
26e976a8 3329 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3330 }
3331 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3332out:
3333 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3334}
3335
3336static void nfs4_lock_release(void *calldata)
3337{
3338 struct nfs4_lockdata *data = calldata;
3339
3340 dprintk("%s: begin!\n", __FUNCTION__);
3341 if (data->arg.open_seqid != NULL)
3342 nfs_free_seqid(data->arg.open_seqid);
3343 if (data->cancelled != 0) {
3344 struct rpc_task *task;
3345 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3346 data->arg.lock_seqid);
3347 if (!IS_ERR(task))
e6b3c4db 3348 rpc_put_task(task);
a5d16a4d
TM		 3349 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3350 } else
3351 nfs_free_seqid(data->arg.lock_seqid);
3352 nfs4_put_lock_state(data->lsp);
3353 put_nfs_open_context(data->ctx);
3354 kfree(data);
3355 dprintk("%s: done!\n", __FUNCTION__);
3356}
3357
3358static const struct rpc_call_ops nfs4_lock_ops = {
3359 .rpc_call_prepare = nfs4_lock_prepare,
3360 .rpc_call_done = nfs4_lock_done,
3361 .rpc_release = nfs4_lock_release,
3362};
3363
3364static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3365{
3366 struct nfs4_lockdata *data;
3367 struct rpc_task *task;
3368 int ret;
3369
3370 dprintk("%s: begin!\n", __FUNCTION__);
3371 data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3372 fl->fl_u.nfs4_fl.owner);
3373 if (data == NULL)
3374 return -ENOMEM;
3375 if (IS_SETLKW(cmd))
3376 data->arg.block = 1;
3377 if (reclaim != 0)
3378 data->arg.reclaim = 1;
3379 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3380 &nfs4_lock_ops, data);
7a1218a2 3381 if (IS_ERR(task))
a5d16a4d 3382 return PTR_ERR(task);
a5d16a4d
TM		 3383 ret = nfs4_wait_for_completion_rpc_task(task);
3384 if (ret == 0) {
3385 ret = data->rpc_status;
3386 if (ret == -NFS4ERR_DENIED)
3387 ret = -EAGAIN;
3388 } else
3389 data->cancelled = 1;
e6b3c4db 3390 rpc_put_task(task);
a5d16a4d
TM		 3391 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3392 return ret;
1da177e4
LT		 3393}
3394
3395static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3396{
202b50dc
TM		 3397 struct nfs_server *server = NFS_SERVER(state->inode);
3398 struct nfs4_exception exception = { };
3399 int err;
3400
3401 do {
42a2d13e
TM		 3402 /* Cache the lock if possible... */
3403 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3404 return 0;
202b50dc
TM		 3405 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3406 if (err != -NFS4ERR_DELAY)
3407 break;
3408 nfs4_handle_exception(server, err, &exception);
3409 } while (exception.retry);
3410 return err;
1da177e4
LT		 3411}
3412
3413static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3414{
202b50dc
TM		 3415 struct nfs_server *server = NFS_SERVER(state->inode);
3416 struct nfs4_exception exception = { };
3417 int err;
3418
6bfc93ef
TM		 3419 err = nfs4_set_lock_state(state, request);
3420 if (err != 0)
3421 return err;
202b50dc 3422 do {
42a2d13e
TM		 3423 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3424 return 0;
202b50dc
TM		 3425 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3426 if (err != -NFS4ERR_DELAY)
3427 break;
3428 nfs4_handle_exception(server, err, &exception);
3429 } while (exception.retry);
3430 return err;
1da177e4
LT		 3431}
3432
3433static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3434{
adfa6f98 3435 struct nfs_client *clp = state->owner->so_client;
01c3b861 3436 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3437 int status;
3438
6bfc93ef 3439 /* Is this a delegated open? */
6bfc93ef
TM		 3440 status = nfs4_set_lock_state(state, request);
3441 if (status != 0)
3442 goto out;
01c3b861
TM		 3443 request->fl_flags |= FL_ACCESS;
3444 status = do_vfs_lock(request->fl_file, request);
3445 if (status < 0)
3446 goto out;
3447 down_read(&clp->cl_sem);
3448 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3449 struct nfs_inode *nfsi = NFS_I(state->inode);
3450 /* Yes: cache locks! */
3451 down_read(&nfsi->rwsem);
3452 /* ...but avoid races with delegation recall... */
3453 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3454 request->fl_flags = fl_flags & ~FL_SLEEP;
3455 status = do_vfs_lock(request->fl_file, request);
3456 up_read(&nfsi->rwsem);
3457 goto out_unlock;
3458 }
3459 up_read(&nfsi->rwsem);
3460 }
6bfc93ef
TM		 3461 status = _nfs4_do_setlk(state, cmd, request, 0);
3462 if (status != 0)
01c3b861 3463 goto out_unlock;
6bfc93ef 3464 /* Note: we always want to sleep here! */
01c3b861 3465 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3466 if (do_vfs_lock(request->fl_file, request) < 0)
3467 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3468out_unlock:
1da177e4 3469 up_read(&clp->cl_sem);
01c3b861
TM		 3470out:
3471 request->fl_flags = fl_flags;
1da177e4
LT		 3472 return status;
3473}
3474
3475static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3476{
3477 struct nfs4_exception exception = { };
3478 int err;
3479
3480 do {
3481 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3482 _nfs4_proc_setlk(state, cmd, request),
3483 &exception);
3484 } while (exception.retry);
3485 return err;
3486}
3487
3488static int
3489nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3490{
3491 struct nfs_open_context *ctx;
3492 struct nfs4_state *state;
3493 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3494 int status;
3495
3496 /* verify open state */
3497 ctx = (struct nfs_open_context *)filp->private_data;
3498 state = ctx->state;
3499
3500 if (request->fl_start < 0 || request->fl_end < 0)
3501 return -EINVAL;
3502
3503 if (IS_GETLK(cmd))
3504 return nfs4_proc_getlk(state, F_GETLK, request);
3505
3506 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3507 return -EINVAL;
3508
3509 if (request->fl_type == F_UNLCK)
3510 return nfs4_proc_unlck(state, cmd, request);
3511
3512 do {
3513 status = nfs4_proc_setlk(state, cmd, request);
3514 if ((status != -EAGAIN) || IS_SETLK(cmd))
3515 break;
3516 timeout = nfs4_set_lock_task_retry(timeout);
3517 status = -ERESTARTSYS;
3518 if (signalled())
3519 break;
3520 } while(status < 0);
1da177e4
LT		 3521 return status;
3522}
3523
888e694c
TM		 3524int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3525{
3526 struct nfs_server *server = NFS_SERVER(state->inode);
3527 struct nfs4_exception exception = { };
3528 int err;
3529
3530 err = nfs4_set_lock_state(state, fl);
3531 if (err != 0)
3532 goto out;
3533 do {
3534 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3535 if (err != -NFS4ERR_DELAY)
3536 break;
3537 err = nfs4_handle_exception(server, err, &exception);
3538 } while (exception.retry);
3539out:
3540 return err;
3541}
6b3b5496 3542
aa1870af
BF		 3543#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3544
6b3b5496
BF		 3545int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3546 size_t buflen, int flags)
3547{
4b580ee3
BF		 3548 struct inode *inode = dentry->d_inode;
3549
3550 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3551 return -EOPNOTSUPP;
3552
3553 if (!S_ISREG(inode->i_mode) &&
3554 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3555 return -EPERM;
3556
3557 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3558}
3559
3560/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3561 * and that's what we'll do for e.g. user attributes that haven't been set.
3562 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3563 * attributes in kernel-managed attribute namespaces. */
3564ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3565 size_t buflen)
3566{
aa1870af
BF		 3567 struct inode *inode = dentry->d_inode;
3568
3569 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3570 return -EOPNOTSUPP;
3571
3572 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3573}
3574
3575ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3576{
aa1870af 3577 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3578
096455a2
BF		 3579 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3580 return 0;
6b3b5496
BF		 3581 if (buf && buflen < len)
3582 return -ERANGE;
3583 if (buf)
aa1870af
BF		 3584 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3585 return len;
6b3b5496
BF		 3586}
3587
683b57b4 3588int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
7aaa0b3b 3589 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3590{
3591 struct nfs_server *server = NFS_SERVER(dir);
3592 u32 bitmask[2] = {
361e624f
MN		 3593 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3594 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3595 };
3596 struct nfs4_fs_locations_arg args = {
3597 .dir_fh = NFS_FH(dir),
3598 .name = &dentry->d_name,
3599 .page = page,
3600 .bitmask = bitmask,
3601 };
3602 struct rpc_message msg = {
3603 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3604 .rpc_argp = &args,
7aaa0b3b 3605 .rpc_resp = fs_locations,
683b57b4
TM		 3606 };
3607 int status;
3608
3609 dprintk("%s: start\n", __FUNCTION__);
3610 fs_locations->fattr.valid = 0;
3611 fs_locations->server = server;
830b8e33 3612 fs_locations->nlocations = 0;
683b57b4
TM		 3613 status = rpc_call_sync(server->client, &msg, 0);
3614 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3615 return status;
3616}
3617
1da177e4
LT		 3618struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3619 .recover_open = nfs4_open_reclaim,
3620 .recover_lock = nfs4_lock_reclaim,
3621};
3622
3623struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3624 .recover_open = nfs4_open_expired,
3625 .recover_lock = nfs4_lock_expired,
3626};
3627
6b3b5496
BF		 3628static struct inode_operations nfs4_file_inode_operations = {
3629 .permission = nfs_permission,
3630 .getattr = nfs_getattr,
3631 .setattr = nfs_setattr,
3632 .getxattr = nfs4_getxattr,
3633 .setxattr = nfs4_setxattr,
3634 .listxattr = nfs4_listxattr,
3635};
3636
509de811 3637const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3638 .version = 4, /* protocol version */
3639 .dentry_ops = &nfs4_dentry_operations,
3640 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3641 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3642 .getroot = nfs4_proc_get_root,
3643 .getattr = nfs4_proc_getattr,
3644 .setattr = nfs4_proc_setattr,
2b3de441 3645 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3646 .lookup = nfs4_proc_lookup,
3647 .access = nfs4_proc_access,
3648 .readlink = nfs4_proc_readlink,
3649 .read = nfs4_proc_read,
1da177e4
LT		 3650 .create = nfs4_proc_create,
3651 .remove = nfs4_proc_remove,
3652 .unlink_setup = nfs4_proc_unlink_setup,
3653 .unlink_done = nfs4_proc_unlink_done,
3654 .rename = nfs4_proc_rename,
3655 .link = nfs4_proc_link,
3656 .symlink = nfs4_proc_symlink,
3657 .mkdir = nfs4_proc_mkdir,
3658 .rmdir = nfs4_proc_remove,
3659 .readdir = nfs4_proc_readdir,
3660 .mknod = nfs4_proc_mknod,
3661 .statfs = nfs4_proc_statfs,
3662 .fsinfo = nfs4_proc_fsinfo,
3663 .pathconf = nfs4_proc_pathconf,
e9326dca 3664 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3665 .decode_dirent = nfs4_decode_dirent,
3666 .read_setup = nfs4_proc_read_setup,
ec06c096 3667 .read_done = nfs4_read_done,
1da177e4 3668 .write_setup = nfs4_proc_write_setup,
788e7a89 3669 .write_done = nfs4_write_done,
1da177e4 3670 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3671 .commit_done = nfs4_commit_done,
02a913a7
TM		 3672 .file_open = nfs_open,
3673 .file_release = nfs_release,
1da177e4 3674 .lock = nfs4_proc_lock,
e50a1c2e 3675 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3676};
3677
3678/*
3679 * Local variables:
3680 * c-basic-offset: 8
3681 * End:
3682 */
kernel source for telekom puls (alcatel/mediatek)