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NFSv4: Fix a race between open() and close()
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4
LT		 53#include "delegation.h"
54
55#define NFSDBG_FACILITY NFSDBG_PROC
56
57#define NFS4_POLL_RETRY_MIN (1*HZ)
58#define NFS4_POLL_RETRY_MAX (15*HZ)
59
0a8838f9 60static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
1da177e4 61static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 62static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
1da177e4 63static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
faf5f49c 64static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
1da177e4
LT		 65extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
66extern struct rpc_procinfo nfs4_procedures[];
67
1da177e4
LT		 68/* Prevent leaks of NFSv4 errors into userland */
69int nfs4_map_errors(int err)
70{
71 if (err < -1000) {
72 dprintk("%s could not handle NFSv4 error %d\n",
73 __FUNCTION__, -err);
74 return -EIO;
75 }
76 return err;
77}
78
79/*
80 * This is our standard bitmap for GETATTR requests.
81 */
82const u32 nfs4_fattr_bitmap[2] = {
83 FATTR4_WORD0_TYPE
84 | FATTR4_WORD0_CHANGE
85 | FATTR4_WORD0_SIZE
86 | FATTR4_WORD0_FSID
87 | FATTR4_WORD0_FILEID,
88 FATTR4_WORD1_MODE
89 | FATTR4_WORD1_NUMLINKS
90 | FATTR4_WORD1_OWNER
91 | FATTR4_WORD1_OWNER_GROUP
92 | FATTR4_WORD1_RAWDEV
93 | FATTR4_WORD1_SPACE_USED
94 | FATTR4_WORD1_TIME_ACCESS
95 | FATTR4_WORD1_TIME_METADATA
96 | FATTR4_WORD1_TIME_MODIFY
97};
98
99const u32 nfs4_statfs_bitmap[2] = {
100 FATTR4_WORD0_FILES_AVAIL
101 | FATTR4_WORD0_FILES_FREE
102 | FATTR4_WORD0_FILES_TOTAL,
103 FATTR4_WORD1_SPACE_AVAIL
104 | FATTR4_WORD1_SPACE_FREE
105 | FATTR4_WORD1_SPACE_TOTAL
106};
107
4ce79717 108const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 109 FATTR4_WORD0_MAXLINK
110 | FATTR4_WORD0_MAXNAME,
111 0
112};
113
114const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
115 | FATTR4_WORD0_MAXREAD
116 | FATTR4_WORD0_MAXWRITE
117 | FATTR4_WORD0_LEASE_TIME,
118 0
119};
120
121static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
122 struct nfs4_readdir_arg *readdir)
123{
124 u32 *start, *p;
125
126 BUG_ON(readdir->count < 80);
127 if (cookie > 2) {
b7ef1956 128 readdir->cookie = cookie;
1da177e4
LT		 129 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
130 return;
131 }
132
133 readdir->cookie = 0;
134 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
135 if (cookie == 2)
136 return;
137
138 /*
139 * NFSv4 servers do not return entries for '.' and '..'
140 * Therefore, we fake these entries here. We let '.'
141 * have cookie 0 and '..' have cookie 1. Note that
142 * when talking to the server, we always send cookie 0
143 * instead of 1 or 2.
144 */
145 start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
146
147 if (cookie == 0) {
148 *p++ = xdr_one; /* next */
149 *p++ = xdr_zero; /* cookie, first word */
150 *p++ = xdr_one; /* cookie, second word */
151 *p++ = xdr_one; /* entry len */
152 memcpy(p, ".\0\0\0", 4); /* entry */
153 p++;
154 *p++ = xdr_one; /* bitmap length */
155 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
156 *p++ = htonl(8); /* attribute buffer length */
157 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
158 }
159
160 *p++ = xdr_one; /* next */
161 *p++ = xdr_zero; /* cookie, first word */
162 *p++ = xdr_two; /* cookie, second word */
163 *p++ = xdr_two; /* entry len */
164 memcpy(p, "..\0\0", 4); /* entry */
165 p++;
166 *p++ = xdr_one; /* bitmap length */
167 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
168 *p++ = htonl(8); /* attribute buffer length */
169 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
170
171 readdir->pgbase = (char *)p - (char *)start;
172 readdir->count -= readdir->pgbase;
173 kunmap_atomic(start, KM_USER0);
174}
175
176static void
177renew_lease(struct nfs_server *server, unsigned long timestamp)
178{
179 struct nfs4_client *clp = server->nfs4_state;
180 spin_lock(&clp->cl_lock);
181 if (time_before(clp->cl_last_renewal,timestamp))
182 clp->cl_last_renewal = timestamp;
183 spin_unlock(&clp->cl_lock);
184}
185
186static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
187{
188 struct nfs_inode *nfsi = NFS_I(inode);
189
decf491f
TM		 190 spin_lock(&inode->i_lock);
191 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1da177e4
LT		 192 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
193 nfsi->change_attr = cinfo->after;
decf491f 194 spin_unlock(&inode->i_lock);
1da177e4
LT		 195}
196
9512135d
TM		 197/* Helper for asynchronous RPC calls */
198static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
199 rpc_action tk_exit, void *calldata)
200{
201 struct rpc_task *task;
202
203 if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
204 return -ENOMEM;
205
206 task->tk_calldata = calldata;
207 task->tk_action = tk_begin;
208 rpc_execute(task);
209 return 0;
210}
211
1da177e4
LT		 212static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
213{
214 struct inode *inode = state->inode;
215
216 open_flags &= (FMODE_READ|FMODE_WRITE);
217 /* Protect against nfs4_find_state() */
ec073428 218 spin_lock(&state->owner->so_lock);
1da177e4 219 spin_lock(&inode->i_lock);
4cecb76f
TM		 220 memcpy(&state->stateid, stateid, sizeof(state->stateid));
221 if ((open_flags & FMODE_WRITE))
222 state->nwriters++;
1da177e4
LT		 223 if (open_flags & FMODE_READ)
224 state->nreaders++;
4cecb76f 225 nfs4_state_set_mode_locked(state, state->state | open_flags);
1da177e4 226 spin_unlock(&inode->i_lock);
ec073428 227 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 228}
229
230/*
231 * OPEN_RECLAIM:
232 * reclaim state on the server after a reboot.
1da177e4
LT		 233 */
234static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
235{
236 struct inode *inode = state->inode;
237 struct nfs_server *server = NFS_SERVER(inode);
238 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
239 struct nfs_openargs o_arg = {
240 .fh = NFS_FH(inode),
1da177e4
LT		 241 .id = sp->so_id,
242 .open_flags = state->state,
243 .clientid = server->nfs4_state->cl_clientid,
244 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
245 .bitmask = server->attr_bitmask,
246 };
247 struct nfs_openres o_res = {
248 .server = server, /* Grrr */
249 };
250 struct rpc_message msg = {
251 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
252 .rpc_argp = &o_arg,
253 .rpc_resp = &o_res,
254 .rpc_cred = sp->so_cred,
255 };
256 int status;
257
258 if (delegation != NULL) {
259 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
260 memcpy(&state->stateid, &delegation->stateid,
261 sizeof(state->stateid));
262 set_bit(NFS_DELEGATED_STATE, &state->flags);
263 return 0;
264 }
265 o_arg.u.delegation_type = delegation->type;
266 }
cee54fc9
TM		 267 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
268 if (o_arg.seqid == NULL)
269 return -ENOMEM;
1da177e4 270 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
cee54fc9
TM		 271 /* Confirm the sequence as being established */
272 nfs_confirm_seqid(&sp->so_seqid, status);
273 nfs_increment_open_seqid(status, o_arg.seqid);
1da177e4
LT		 274 if (status == 0) {
275 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
276 if (o_res.delegation_type != 0) {
277 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
278 /* Did the server issue an immediate delegation recall? */
279 if (o_res.do_recall)
280 nfs_async_inode_return_delegation(inode, &o_res.stateid);
281 }
282 }
cee54fc9 283 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 284 clear_bit(NFS_DELEGATED_STATE, &state->flags);
285 /* Ensure we update the inode attributes */
286 NFS_CACHEINV(inode);
287 return status;
288}
289
290static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
291{
292 struct nfs_server *server = NFS_SERVER(state->inode);
293 struct nfs4_exception exception = { };
294 int err;
295 do {
296 err = _nfs4_open_reclaim(sp, state);
202b50dc
TM		 297 if (err != -NFS4ERR_DELAY)
298 break;
299 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 300 } while (exception.retry);
301 return err;
302}
303
304static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
305{
306 struct nfs4_state_owner *sp = state->owner;
307 struct inode *inode = dentry->d_inode;
308 struct nfs_server *server = NFS_SERVER(inode);
309 struct dentry *parent = dget_parent(dentry);
310 struct nfs_openargs arg = {
311 .fh = NFS_FH(parent->d_inode),
312 .clientid = server->nfs4_state->cl_clientid,
313 .name = &dentry->d_name,
314 .id = sp->so_id,
315 .server = server,
316 .bitmask = server->attr_bitmask,
317 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
318 };
319 struct nfs_openres res = {
320 .server = server,
321 };
322 struct rpc_message msg = {
323 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
324 .rpc_argp = &arg,
325 .rpc_resp = &res,
326 .rpc_cred = sp->so_cred,
327 };
328 int status = 0;
329
1da177e4
LT		 330 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
331 goto out;
332 if (state->state == 0)
333 goto out;
cee54fc9
TM		 334 arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
335 status = -ENOMEM;
336 if (arg.seqid == NULL)
337 goto out;
1da177e4
LT		 338 arg.open_flags = state->state;
339 memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
340 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
cee54fc9 341 nfs_increment_open_seqid(status, arg.seqid);
0a8838f9
TM		 342 if (status != 0)
343 goto out_free;
344 if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
345 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
346 sp, &res.stateid, arg.seqid);
347 if (status != 0)
348 goto out_free;
349 }
350 nfs_confirm_seqid(&sp->so_seqid, 0);
1da177e4
LT		 351 if (status >= 0) {
352 memcpy(state->stateid.data, res.stateid.data,
353 sizeof(state->stateid.data));
354 clear_bit(NFS_DELEGATED_STATE, &state->flags);
355 }
0a8838f9 356out_free:
cee54fc9 357 nfs_free_seqid(arg.seqid);
1da177e4 358out:
1da177e4
LT		 359 dput(parent);
360 return status;
361}
362
363int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
364{
365 struct nfs4_exception exception = { };
366 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
367 int err;
368 do {
369 err = _nfs4_open_delegation_recall(dentry, state);
370 switch (err) {
371 case 0:
372 return err;
373 case -NFS4ERR_STALE_CLIENTID:
374 case -NFS4ERR_STALE_STATEID:
375 case -NFS4ERR_EXPIRED:
376 /* Don't recall a delegation if it was lost */
377 nfs4_schedule_state_recovery(server->nfs4_state);
378 return err;
379 }
380 err = nfs4_handle_exception(server, err, &exception);
381 } while (exception.retry);
382 return err;
383}
384
0a8838f9 385static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid)
1da177e4
LT		 386{
387 struct nfs_open_confirmargs arg = {
388 .fh = fh,
cee54fc9 389 .seqid = seqid,
1da177e4
LT		 390 .stateid = *stateid,
391 };
392 struct nfs_open_confirmres res;
393 struct rpc_message msg = {
394 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
395 .rpc_argp = &arg,
396 .rpc_resp = &res,
397 .rpc_cred = sp->so_cred,
398 };
399 int status;
400
401 status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
cee54fc9
TM		 402 /* Confirm the sequence as being established */
403 nfs_confirm_seqid(&sp->so_seqid, status);
404 nfs_increment_open_seqid(status, seqid);
1da177e4
LT		 405 if (status >= 0)
406 memcpy(stateid, &res.stateid, sizeof(*stateid));
407 return status;
408}
409
410static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
411{
412 struct nfs_server *server = NFS_SERVER(dir);
413 struct rpc_message msg = {
414 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
415 .rpc_argp = o_arg,
416 .rpc_resp = o_res,
417 .rpc_cred = sp->so_cred,
418 };
419 int status;
420
421 /* Update sequence id. The caller must serialize! */
1da177e4
LT		 422 o_arg->id = sp->so_id;
423 o_arg->clientid = sp->so_client->cl_clientid;
424
425 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
6f926b5b
TM		 426 if (status == 0) {
427 /* OPEN on anything except a regular file is disallowed in NFSv4 */
428 switch (o_res->f_attr->mode & S_IFMT) {
429 case S_IFREG:
430 break;
431 case S_IFLNK:
432 status = -ELOOP;
433 break;
434 case S_IFDIR:
435 status = -EISDIR;
436 break;
437 default:
438 status = -ENOTDIR;
439 }
440 }
441
cee54fc9 442 nfs_increment_open_seqid(status, o_arg->seqid);
1da177e4
LT		 443 if (status != 0)
444 goto out;
56ae19f3
TM		 445 if (o_arg->open_flags & O_CREAT) {
446 update_changeattr(dir, &o_res->cinfo);
447 nfs_post_op_update_inode(dir, o_res->dir_attr);
448 } else
449 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4
LT		 450 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
451 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
cee54fc9 452 sp, &o_res->stateid, o_arg->seqid);
1da177e4
LT		 453 if (status != 0)
454 goto out;
455 }
cee54fc9 456 nfs_confirm_seqid(&sp->so_seqid, 0);
1da177e4
LT		 457 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
458 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
459out:
460 return status;
461}
462
463static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
464{
465 struct nfs_access_entry cache;
466 int mask = 0;
467 int status;
468
469 if (openflags & FMODE_READ)
470 mask |= MAY_READ;
471 if (openflags & FMODE_WRITE)
472 mask |= MAY_WRITE;
473 status = nfs_access_get_cached(inode, cred, &cache);
474 if (status == 0)
475 goto out;
476
477 /* Be clever: ask server to check for all possible rights */
478 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
479 cache.cred = cred;
480 cache.jiffies = jiffies;
481 status = _nfs4_proc_access(inode, &cache);
482 if (status != 0)
483 return status;
484 nfs_access_add_cache(inode, &cache);
485out:
486 if ((cache.mask & mask) == mask)
487 return 0;
488 return -EACCES;
489}
490
491/*
492 * OPEN_EXPIRED:
493 * reclaim state on the server after a network partition.
494 * Assumes caller holds the appropriate lock
495 */
496static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
497{
498 struct dentry *parent = dget_parent(dentry);
499 struct inode *dir = parent->d_inode;
500 struct inode *inode = state->inode;
501 struct nfs_server *server = NFS_SERVER(dir);
502 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
56ae19f3 503 struct nfs_fattr f_attr, dir_attr;
1da177e4
LT		 504 struct nfs_openargs o_arg = {
505 .fh = NFS_FH(dir),
506 .open_flags = state->state,
507 .name = &dentry->d_name,
508 .bitmask = server->attr_bitmask,
509 .claim = NFS4_OPEN_CLAIM_NULL,
510 };
511 struct nfs_openres o_res = {
512 .f_attr = &f_attr,
56ae19f3 513 .dir_attr = &dir_attr,
1da177e4
LT		 514 .server = server,
515 };
516 int status = 0;
517
518 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
519 status = _nfs4_do_access(inode, sp->so_cred, state->state);
520 if (status < 0)
521 goto out;
522 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
523 set_bit(NFS_DELEGATED_STATE, &state->flags);
524 goto out;
525 }
cee54fc9
TM		 526 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
527 status = -ENOMEM;
528 if (o_arg.seqid == NULL)
529 goto out;
0e574af1 530 nfs_fattr_init(&f_attr);
56ae19f3 531 nfs_fattr_init(&dir_attr);
1da177e4
LT		 532 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
533 if (status != 0)
534 goto out_nodeleg;
535 /* Check if files differ */
536 if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
537 goto out_stale;
538 /* Has the file handle changed? */
539 if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
540 /* Verify if the change attributes are the same */
541 if (f_attr.change_attr != NFS_I(inode)->change_attr)
542 goto out_stale;
543 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
544 goto out_stale;
545 /* Lets just pretend that this is the same file */
546 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
547 NFS_I(inode)->fileid = f_attr.fileid;
548 }
549 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
550 if (o_res.delegation_type != 0) {
551 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
552 nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
553 else
554 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
555 }
556out_nodeleg:
cee54fc9 557 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 558 clear_bit(NFS_DELEGATED_STATE, &state->flags);
559out:
560 dput(parent);
561 return status;
562out_stale:
563 status = -ESTALE;
564 /* Invalidate the state owner so we don't ever use it again */
565 nfs4_drop_state_owner(sp);
566 d_drop(dentry);
567 /* Should we be trying to close that stateid? */
568 goto out_nodeleg;
569}
570
202b50dc
TM		 571static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
572{
573 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
574 struct nfs4_exception exception = { };
575 int err;
576
577 do {
578 err = _nfs4_open_expired(sp, state, dentry);
579 if (err == -NFS4ERR_DELAY)
580 nfs4_handle_exception(server, err, &exception);
581 } while (exception.retry);
582 return err;
583}
584
1da177e4
LT		 585static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
586{
587 struct nfs_inode *nfsi = NFS_I(state->inode);
588 struct nfs_open_context *ctx;
589 int status;
590
591 spin_lock(&state->inode->i_lock);
592 list_for_each_entry(ctx, &nfsi->open_files, list) {
593 if (ctx->state != state)
594 continue;
595 get_nfs_open_context(ctx);
596 spin_unlock(&state->inode->i_lock);
202b50dc 597 status = nfs4_do_open_expired(sp, state, ctx->dentry);
1da177e4
LT		 598 put_nfs_open_context(ctx);
599 return status;
600 }
601 spin_unlock(&state->inode->i_lock);
602 return -ENOENT;
603}
604
605/*
606 * Returns an nfs4_state + an extra reference to the inode
607 */
608static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
609{
610 struct nfs_delegation *delegation;
611 struct nfs_server *server = NFS_SERVER(inode);
612 struct nfs4_client *clp = server->nfs4_state;
613 struct nfs_inode *nfsi = NFS_I(inode);
614 struct nfs4_state_owner *sp = NULL;
615 struct nfs4_state *state = NULL;
616 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
617 int err;
618
619 /* Protect against reboot recovery - NOTE ORDER! */
620 down_read(&clp->cl_sem);
621 /* Protect against delegation recall */
622 down_read(&nfsi->rwsem);
623 delegation = NFS_I(inode)->delegation;
624 err = -ENOENT;
625 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
626 goto out_err;
627 err = -ENOMEM;
628 if (!(sp = nfs4_get_state_owner(server, cred))) {
629 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
630 goto out_err;
631 }
1da177e4
LT		 632 state = nfs4_get_open_state(inode, sp);
633 if (state == NULL)
634 goto out_err;
635
636 err = -ENOENT;
637 if ((state->state & open_flags) == open_flags) {
638 spin_lock(&inode->i_lock);
639 if (open_flags & FMODE_READ)
640 state->nreaders++;
641 if (open_flags & FMODE_WRITE)
642 state->nwriters++;
643 spin_unlock(&inode->i_lock);
644 goto out_ok;
645 } else if (state->state != 0)
646 goto out_err;
647
648 lock_kernel();
649 err = _nfs4_do_access(inode, cred, open_flags);
650 unlock_kernel();
651 if (err != 0)
652 goto out_err;
653 set_bit(NFS_DELEGATED_STATE, &state->flags);
654 update_open_stateid(state, &delegation->stateid, open_flags);
655out_ok:
1da177e4
LT		 656 nfs4_put_state_owner(sp);
657 up_read(&nfsi->rwsem);
658 up_read(&clp->cl_sem);
659 igrab(inode);
660 *res = state;
661 return 0;
662out_err:
663 if (sp != NULL) {
664 if (state != NULL)
665 nfs4_put_open_state(state);
1da177e4
LT		 666 nfs4_put_state_owner(sp);
667 }
668 up_read(&nfsi->rwsem);
669 up_read(&clp->cl_sem);
b8e5c4c2
TM		 670 if (err != -EACCES)
671 nfs_inode_return_delegation(inode);
1da177e4
LT		 672 return err;
673}
674
675static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
676{
677 struct nfs4_exception exception = { };
678 struct nfs4_state *res;
679 int err;
680
681 do {
682 err = _nfs4_open_delegated(inode, flags, cred, &res);
683 if (err == 0)
684 break;
685 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
686 err, &exception));
687 } while (exception.retry);
688 return res;
689}
690
691/*
692 * Returns an nfs4_state + an referenced inode
693 */
694static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
695{
696 struct nfs4_state_owner *sp;
697 struct nfs4_state *state = NULL;
698 struct nfs_server *server = NFS_SERVER(dir);
699 struct nfs4_client *clp = server->nfs4_state;
700 struct inode *inode = NULL;
701 int status;
56ae19f3 702 struct nfs_fattr f_attr, dir_attr;
1da177e4
LT		 703 struct nfs_openargs o_arg = {
704 .fh = NFS_FH(dir),
705 .open_flags = flags,
706 .name = &dentry->d_name,
707 .server = server,
708 .bitmask = server->attr_bitmask,
709 .claim = NFS4_OPEN_CLAIM_NULL,
710 };
711 struct nfs_openres o_res = {
712 .f_attr = &f_attr,
56ae19f3 713 .dir_attr = &dir_attr,
1da177e4
LT		 714 .server = server,
715 };
716
717 /* Protect against reboot recovery conflicts */
718 down_read(&clp->cl_sem);
719 status = -ENOMEM;
720 if (!(sp = nfs4_get_state_owner(server, cred))) {
721 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
722 goto out_err;
723 }
724 if (flags & O_EXCL) {
725 u32 *p = (u32 *) o_arg.u.verifier.data;
726 p[0] = jiffies;
727 p[1] = current->pid;
728 } else
729 o_arg.u.attrs = sattr;
730 /* Serialization for the sequence id */
1da177e4 731
cee54fc9
TM		 732 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
733 if (o_arg.seqid == NULL)
734 return -ENOMEM;
0e574af1 735 nfs_fattr_init(&f_attr);
56ae19f3 736 nfs_fattr_init(&dir_attr);
1da177e4
LT		 737 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
738 if (status != 0)
739 goto out_err;
740
741 status = -ENOMEM;
742 inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
743 if (!inode)
744 goto out_err;
745 state = nfs4_get_open_state(inode, sp);
746 if (!state)
747 goto out_err;
748 update_open_stateid(state, &o_res.stateid, flags);
749 if (o_res.delegation_type != 0)
750 nfs_inode_set_delegation(inode, cred, &o_res);
cee54fc9 751 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 752 nfs4_put_state_owner(sp);
753 up_read(&clp->cl_sem);
754 *res = state;
755 return 0;
756out_err:
757 if (sp != NULL) {
758 if (state != NULL)
759 nfs4_put_open_state(state);
cee54fc9 760 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 761 nfs4_put_state_owner(sp);
762 }
763 /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
764 up_read(&clp->cl_sem);
765 if (inode != NULL)
766 iput(inode);
767 *res = NULL;
768 return status;
769}
770
771
772static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
773{
774 struct nfs4_exception exception = { };
775 struct nfs4_state *res;
776 int status;
777
778 do {
779 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
780 if (status == 0)
781 break;
782 /* NOTE: BAD_SEQID means the server and client disagree about the
783 * book-keeping w.r.t. state-changing operations
784 * (OPEN/CLOSE/LOCK/LOCKU...)
785 * It is actually a sign of a bug on the client or on the server.
786 *
787 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 788 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 789 * have unhashed the old state_owner for us, and that we can
790 * therefore safely retry using a new one. We should still warn
791 * the user though...
792 */
793 if (status == -NFS4ERR_BAD_SEQID) {
794 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
795 exception.retry = 1;
796 continue;
797 }
550f5747
TM		 798 /*
799 * BAD_STATEID on OPEN means that the server cancelled our
800 * state before it received the OPEN_CONFIRM.
801 * Recover by retrying the request as per the discussion
802 * on Page 181 of RFC3530.
803 */
804 if (status == -NFS4ERR_BAD_STATEID) {
805 exception.retry = 1;
806 continue;
807 }
1da177e4
LT		 808 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
809 status, &exception));
810 } while (exception.retry);
811 return res;
812}
813
814static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
815 struct nfs_fh *fhandle, struct iattr *sattr,
816 struct nfs4_state *state)
817{
818 struct nfs_setattrargs arg = {
819 .fh = fhandle,
820 .iap = sattr,
821 .server = server,
822 .bitmask = server->attr_bitmask,
823 };
824 struct nfs_setattrres res = {
825 .fattr = fattr,
826 .server = server,
827 };
828 struct rpc_message msg = {
829 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
830 .rpc_argp = &arg,
831 .rpc_resp = &res,
832 };
65e4308d 833 int status;
1da177e4 834
0e574af1 835 nfs_fattr_init(fattr);
1da177e4 836
08e9eac4 837 if (state != NULL) {
1da177e4 838 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 839 nfs4_copy_stateid(&arg.stateid, state, current->files);
840 } else
1da177e4
LT		 841 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
842
65e4308d
TM		 843 status = rpc_call_sync(server->client, &msg, 0);
844 return status;
1da177e4
LT		 845}
846
847static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
848 struct nfs_fh *fhandle, struct iattr *sattr,
849 struct nfs4_state *state)
850{
851 struct nfs4_exception exception = { };
852 int err;
853 do {
854 err = nfs4_handle_exception(server,
855 _nfs4_do_setattr(server, fattr, fhandle, sattr,
856 state),
857 &exception);
858 } while (exception.retry);
859 return err;
860}
861
862struct nfs4_closedata {
863 struct inode *inode;
864 struct nfs4_state *state;
865 struct nfs_closeargs arg;
866 struct nfs_closeres res;
516a6af6 867 struct nfs_fattr fattr;
1da177e4
LT		 868};
869
9512135d
TM		 870static void nfs4_free_closedata(struct nfs4_closedata *calldata)
871{
872 struct nfs4_state *state = calldata->state;
873 struct nfs4_state_owner *sp = state->owner;
9512135d
TM		 874
875 nfs4_put_open_state(calldata->state);
876 nfs_free_seqid(calldata->arg.seqid);
9512135d 877 nfs4_put_state_owner(sp);
9512135d
TM		 878 kfree(calldata);
879}
880
1da177e4
LT		 881static void nfs4_close_done(struct rpc_task *task)
882{
883 struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
884 struct nfs4_state *state = calldata->state;
1da177e4
LT		 885 struct nfs_server *server = NFS_SERVER(calldata->inode);
886
887 /* hmm. we are done with the inode, and in the process of freeing
888 * the state_owner. we keep this around to process errors
889 */
cee54fc9 890 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 891 switch (task->tk_status) {
892 case 0:
893 memcpy(&state->stateid, &calldata->res.stateid,
894 sizeof(state->stateid));
895 break;
896 case -NFS4ERR_STALE_STATEID:
897 case -NFS4ERR_EXPIRED:
1da177e4
LT		 898 nfs4_schedule_state_recovery(server->nfs4_state);
899 break;
900 default:
901 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
902 rpc_restart_call(task);
903 return;
904 }
905 }
516a6af6 906 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
9512135d 907 nfs4_free_closedata(calldata);
1da177e4
LT		 908}
909
9512135d 910static void nfs4_close_begin(struct rpc_task *task)
1da177e4 911{
9512135d
TM		 912 struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
913 struct nfs4_state *state = calldata->state;
1da177e4
LT		 914 struct rpc_message msg = {
915 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
916 .rpc_argp = &calldata->arg,
917 .rpc_resp = &calldata->res,
9512135d 918 .rpc_cred = state->owner->so_cred,
1da177e4 919 };
4cecb76f 920 int mode = 0, old_mode;
9512135d
TM		 921 int status;
922
923 status = nfs_wait_on_sequence(calldata->arg.seqid, task);
924 if (status != 0)
925 return;
9512135d
TM		 926 /* Recalculate the new open mode in case someone reopened the file
927 * while we were waiting in line to be scheduled.
928 */
4cecb76f
TM		 929 spin_lock(&state->owner->so_lock);
930 spin_lock(&calldata->inode->i_lock);
931 mode = old_mode = state->state;
932 if (state->nreaders == 0)
933 mode &= ~FMODE_READ;
934 if (state->nwriters == 0)
935 mode &= ~FMODE_WRITE;
936 nfs4_state_set_mode_locked(state, mode);
937 spin_unlock(&calldata->inode->i_lock);
938 spin_unlock(&state->owner->so_lock);
939 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
9512135d
TM		 940 nfs4_free_closedata(calldata);
941 task->tk_exit = NULL;
942 rpc_exit(task, 0);
943 return;
944 }
516a6af6 945 nfs_fattr_init(calldata->res.fattr);
9512135d 946 if (mode != 0)
1da177e4 947 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d
TM		 948 calldata->arg.open_flags = mode;
949 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 950}
951
952/*
953 * It is possible for data to be read/written from a mem-mapped file
954 * after the sys_close call (which hits the vfs layer as a flush).
955 * This means that we can't safely call nfsv4 close on a file until
956 * the inode is cleared. This in turn means that we are not good
957 * NFSv4 citizens - we do not indicate to the server to update the file's
958 * share state even when we are done with one of the three share
959 * stateid's in the inode.
960 *
961 * NOTE: Caller must be holding the sp->so_owner semaphore!
962 */
4cecb76f 963int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1da177e4 964{
516a6af6 965 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 966 struct nfs4_closedata *calldata;
9512135d 967 int status = -ENOMEM;
1da177e4 968
9512135d 969 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 970 if (calldata == NULL)
9512135d 971 goto out;
1da177e4
LT		 972 calldata->inode = inode;
973 calldata->state = state;
974 calldata->arg.fh = NFS_FH(inode);
9512135d 975 calldata->arg.stateid = &state->stateid;
1da177e4 976 /* Serialization for the sequence id */
cee54fc9 977 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 978 if (calldata->arg.seqid == NULL)
979 goto out_free_calldata;
516a6af6
TM		 980 calldata->arg.bitmask = server->attr_bitmask;
981 calldata->res.fattr = &calldata->fattr;
982 calldata->res.server = server;
9512135d 983
516a6af6 984 status = nfs4_call_async(server->client, nfs4_close_begin,
9512135d
TM		 985 nfs4_close_done, calldata);
986 if (status == 0)
987 goto out;
988
989 nfs_free_seqid(calldata->arg.seqid);
990out_free_calldata:
991 kfree(calldata);
992out:
993 return status;
1da177e4
LT		 994}
995
02a913a7
TM		 996static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
997{
998 struct file *filp;
999
1000 filp = lookup_instantiate_filp(nd, dentry, NULL);
1001 if (!IS_ERR(filp)) {
1002 struct nfs_open_context *ctx;
1003 ctx = (struct nfs_open_context *)filp->private_data;
1004 ctx->state = state;
1005 } else
1006 nfs4_close_state(state, nd->intent.open.flags);
1007}
1008
1009struct dentry *
1da177e4
LT		 1010nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1011{
1012 struct iattr attr;
1013 struct rpc_cred *cred;
1014 struct nfs4_state *state;
02a913a7 1015 struct dentry *res;
1da177e4
LT		 1016
1017 if (nd->flags & LOOKUP_CREATE) {
1018 attr.ia_mode = nd->intent.open.create_mode;
1019 attr.ia_valid = ATTR_MODE;
1020 if (!IS_POSIXACL(dir))
1021 attr.ia_mode &= ~current->fs->umask;
1022 } else {
1023 attr.ia_valid = 0;
1024 BUG_ON(nd->intent.open.flags & O_CREAT);
1025 }
1026
1027 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1028 if (IS_ERR(cred))
02a913a7 1029 return (struct dentry *)cred;
1da177e4
LT		 1030 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1031 put_rpccred(cred);
02a913a7
TM		 1032 if (IS_ERR(state)) {
1033 if (PTR_ERR(state) == -ENOENT)
1034 d_add(dentry, NULL);
1035 return (struct dentry *)state;
1036 }
1037 res = d_add_unique(dentry, state->inode);
1038 if (res != NULL)
1039 dentry = res;
1040 nfs4_intent_set_file(nd, dentry, state);
1041 return res;
1da177e4
LT		 1042}
1043
1044int
02a913a7 1045nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4
LT		 1046{
1047 struct rpc_cred *cred;
1048 struct nfs4_state *state;
1049 struct inode *inode;
1050
1051 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1052 if (IS_ERR(cred))
1053 return PTR_ERR(cred);
1054 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1055 if (IS_ERR(state))
1056 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1057 put_rpccred(cred);
02a913a7
TM		 1058 if (IS_ERR(state)) {
1059 switch (PTR_ERR(state)) {
1060 case -EPERM:
1061 case -EACCES:
1062 case -EDQUOT:
1063 case -ENOSPC:
1064 case -EROFS:
1065 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1066 return 1;
1067 case -ENOENT:
1068 if (dentry->d_inode == NULL)
1069 return 1;
1070 }
1071 goto out_drop;
1072 }
1da177e4 1073 inode = state->inode;
02a913a7 1074 iput(inode);
1da177e4 1075 if (inode == dentry->d_inode) {
02a913a7 1076 nfs4_intent_set_file(nd, dentry, state);
1da177e4
LT		 1077 return 1;
1078 }
1da177e4 1079 nfs4_close_state(state, openflags);
02a913a7
TM		 1080out_drop:
1081 d_drop(dentry);
1da177e4
LT		 1082 return 0;
1083}
1084
1085
1086static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1087{
1088 struct nfs4_server_caps_res res = {};
1089 struct rpc_message msg = {
1090 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1091 .rpc_argp = fhandle,
1092 .rpc_resp = &res,
1093 };
1094 int status;
1095
1096 status = rpc_call_sync(server->client, &msg, 0);
1097 if (status == 0) {
1098 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1099 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1100 server->caps |= NFS_CAP_ACLS;
1101 if (res.has_links != 0)
1102 server->caps |= NFS_CAP_HARDLINKS;
1103 if (res.has_symlinks != 0)
1104 server->caps |= NFS_CAP_SYMLINKS;
1105 server->acl_bitmask = res.acl_bitmask;
1106 }
1107 return status;
1108}
1109
1110static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1111{
1112 struct nfs4_exception exception = { };
1113 int err;
1114 do {
1115 err = nfs4_handle_exception(server,
1116 _nfs4_server_capabilities(server, fhandle),
1117 &exception);
1118 } while (exception.retry);
1119 return err;
1120}
1121
1122static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1123 struct nfs_fsinfo *info)
1124{
1da177e4
LT		 1125 struct nfs4_lookup_root_arg args = {
1126 .bitmask = nfs4_fattr_bitmap,
1127 };
1128 struct nfs4_lookup_res res = {
1129 .server = server,
0e574af1 1130 .fattr = info->fattr,
1da177e4
LT		 1131 .fh = fhandle,
1132 };
1133 struct rpc_message msg = {
1134 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1135 .rpc_argp = &args,
1136 .rpc_resp = &res,
1137 };
0e574af1 1138 nfs_fattr_init(info->fattr);
1da177e4
LT		 1139 return rpc_call_sync(server->client, &msg, 0);
1140}
1141
1142static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1143 struct nfs_fsinfo *info)
1144{
1145 struct nfs4_exception exception = { };
1146 int err;
1147 do {
1148 err = nfs4_handle_exception(server,
1149 _nfs4_lookup_root(server, fhandle, info),
1150 &exception);
1151 } while (exception.retry);
1152 return err;
1153}
1154
1155static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1156 struct nfs_fsinfo *info)
1157{
1158 struct nfs_fattr * fattr = info->fattr;
1159 unsigned char * p;
1160 struct qstr q;
1161 struct nfs4_lookup_arg args = {
1162 .dir_fh = fhandle,
1163 .name = &q,
1164 .bitmask = nfs4_fattr_bitmap,
1165 };
1166 struct nfs4_lookup_res res = {
1167 .server = server,
1168 .fattr = fattr,
1169 .fh = fhandle,
1170 };
1171 struct rpc_message msg = {
1172 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1173 .rpc_argp = &args,
1174 .rpc_resp = &res,
1175 };
1176 int status;
1177
1178 /*
1179 * Now we do a separate LOOKUP for each component of the mount path.
1180 * The LOOKUPs are done separately so that we can conveniently
1181 * catch an ERR_WRONGSEC if it occurs along the way...
1182 */
1183 status = nfs4_lookup_root(server, fhandle, info);
1184 if (status)
1185 goto out;
1186
1187 p = server->mnt_path;
1188 for (;;) {
1189 struct nfs4_exception exception = { };
1190
1191 while (*p == '/')
1192 p++;
1193 if (!*p)
1194 break;
1195 q.name = p;
1196 while (*p && (*p != '/'))
1197 p++;
1198 q.len = p - q.name;
1199
1200 do {
0e574af1 1201 nfs_fattr_init(fattr);
1da177e4
LT		 1202 status = nfs4_handle_exception(server,
1203 rpc_call_sync(server->client, &msg, 0),
1204 &exception);
1205 } while (exception.retry);
1206 if (status == 0)
1207 continue;
1208 if (status == -ENOENT) {
1209 printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1210 printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1211 }
1212 break;
1213 }
1214 if (status == 0)
1215 status = nfs4_server_capabilities(server, fhandle);
1216 if (status == 0)
1217 status = nfs4_do_fsinfo(server, fhandle, info);
1218out:
1219 return status;
1220}
1221
1222static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1223{
1224 struct nfs4_getattr_arg args = {
1225 .fh = fhandle,
1226 .bitmask = server->attr_bitmask,
1227 };
1228 struct nfs4_getattr_res res = {
1229 .fattr = fattr,
1230 .server = server,
1231 };
1232 struct rpc_message msg = {
1233 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1234 .rpc_argp = &args,
1235 .rpc_resp = &res,
1236 };
1237
0e574af1 1238 nfs_fattr_init(fattr);
1da177e4
LT		 1239 return rpc_call_sync(server->client, &msg, 0);
1240}
1241
1242static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1243{
1244 struct nfs4_exception exception = { };
1245 int err;
1246 do {
1247 err = nfs4_handle_exception(server,
1248 _nfs4_proc_getattr(server, fhandle, fattr),
1249 &exception);
1250 } while (exception.retry);
1251 return err;
1252}
1253
1254/*
1255 * The file is not closed if it is opened due to the a request to change
1256 * the size of the file. The open call will not be needed once the
1257 * VFS layer lookup-intents are implemented.
1258 *
1259 * Close is called when the inode is destroyed.
1260 * If we haven't opened the file for O_WRONLY, we
1261 * need to in the size_change case to obtain a stateid.
1262 *
1263 * Got race?
1264 * Because OPEN is always done by name in nfsv4, it is
1265 * possible that we opened a different file by the same
1266 * name. We can recognize this race condition, but we
1267 * can't do anything about it besides returning an error.
1268 *
1269 * This will be fixed with VFS changes (lookup-intent).
1270 */
1271static int
1272nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1273 struct iattr *sattr)
1274{
08e9eac4
TM		 1275 struct rpc_cred *cred;
1276 struct inode *inode = dentry->d_inode;
1277 struct nfs4_state *state;
1da177e4
LT		 1278 int status;
1279
0e574af1 1280 nfs_fattr_init(fattr);
1da177e4 1281
08e9eac4
TM		 1282 cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1283 if (IS_ERR(cred))
1284 return PTR_ERR(cred);
1285 /* Search for an existing WRITE delegation first */
1286 state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1287 if (!IS_ERR(state)) {
1288 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1289 iput(inode);
1290 } else {
1291 /* Search for an existing open(O_WRITE) stateid */
1da177e4 1292 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1da177e4 1293 }
08e9eac4 1294
1da177e4
LT		 1295 status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1296 NFS_FH(inode), sattr, state);
65e4308d
TM		 1297 if (status == 0)
1298 nfs_setattr_update_inode(inode, sattr);
08e9eac4 1299 if (state != NULL)
1da177e4 1300 nfs4_close_state(state, FMODE_WRITE);
08e9eac4 1301 put_rpccred(cred);
1da177e4
LT		 1302 return status;
1303}
1304
1305static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1306 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1307{
1308 int status;
1309 struct nfs_server *server = NFS_SERVER(dir);
1310 struct nfs4_lookup_arg args = {
1311 .bitmask = server->attr_bitmask,
1312 .dir_fh = NFS_FH(dir),
1313 .name = name,
1314 };
1315 struct nfs4_lookup_res res = {
1316 .server = server,
1317 .fattr = fattr,
1318 .fh = fhandle,
1319 };
1320 struct rpc_message msg = {
1321 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1322 .rpc_argp = &args,
1323 .rpc_resp = &res,
1324 };
1325
0e574af1 1326 nfs_fattr_init(fattr);
1da177e4
LT		 1327
1328 dprintk("NFS call lookup %s\n", name->name);
1329 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1330 dprintk("NFS reply lookup: %d\n", status);
1331 return status;
1332}
1333
1334static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1335{
1336 struct nfs4_exception exception = { };
1337 int err;
1338 do {
1339 err = nfs4_handle_exception(NFS_SERVER(dir),
1340 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1341 &exception);
1342 } while (exception.retry);
1343 return err;
1344}
1345
1346static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1347{
1348 struct nfs4_accessargs args = {
1349 .fh = NFS_FH(inode),
1350 };
1351 struct nfs4_accessres res = { 0 };
1352 struct rpc_message msg = {
1353 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1354 .rpc_argp = &args,
1355 .rpc_resp = &res,
1356 .rpc_cred = entry->cred,
1357 };
1358 int mode = entry->mask;
1359 int status;
1360
1361 /*
1362 * Determine which access bits we want to ask for...
1363 */
1364 if (mode & MAY_READ)
1365 args.access |= NFS4_ACCESS_READ;
1366 if (S_ISDIR(inode->i_mode)) {
1367 if (mode & MAY_WRITE)
1368 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1369 if (mode & MAY_EXEC)
1370 args.access |= NFS4_ACCESS_LOOKUP;
1371 } else {
1372 if (mode & MAY_WRITE)
1373 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1374 if (mode & MAY_EXEC)
1375 args.access |= NFS4_ACCESS_EXECUTE;
1376 }
1377 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1378 if (!status) {
1379 entry->mask = 0;
1380 if (res.access & NFS4_ACCESS_READ)
1381 entry->mask |= MAY_READ;
1382 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1383 entry->mask |= MAY_WRITE;
1384 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1385 entry->mask |= MAY_EXEC;
1386 }
1387 return status;
1388}
1389
1390static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1391{
1392 struct nfs4_exception exception = { };
1393 int err;
1394 do {
1395 err = nfs4_handle_exception(NFS_SERVER(inode),
1396 _nfs4_proc_access(inode, entry),
1397 &exception);
1398 } while (exception.retry);
1399 return err;
1400}
1401
1402/*
1403 * TODO: For the time being, we don't try to get any attributes
1404 * along with any of the zero-copy operations READ, READDIR,
1405 * READLINK, WRITE.
1406 *
1407 * In the case of the first three, we want to put the GETATTR
1408 * after the read-type operation -- this is because it is hard
1409 * to predict the length of a GETATTR response in v4, and thus
1410 * align the READ data correctly. This means that the GETATTR
1411 * may end up partially falling into the page cache, and we should
1412 * shift it into the 'tail' of the xdr_buf before processing.
1413 * To do this efficiently, we need to know the total length
1414 * of data received, which doesn't seem to be available outside
1415 * of the RPC layer.
1416 *
1417 * In the case of WRITE, we also want to put the GETATTR after
1418 * the operation -- in this case because we want to make sure
1419 * we get the post-operation mtime and size. This means that
1420 * we can't use xdr_encode_pages() as written: we need a variant
1421 * of it which would leave room in the 'tail' iovec.
1422 *
1423 * Both of these changes to the XDR layer would in fact be quite
1424 * minor, but I decided to leave them for a subsequent patch.
1425 */
1426static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1427 unsigned int pgbase, unsigned int pglen)
1428{
1429 struct nfs4_readlink args = {
1430 .fh = NFS_FH(inode),
1431 .pgbase = pgbase,
1432 .pglen = pglen,
1433 .pages = &page,
1434 };
1435 struct rpc_message msg = {
1436 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1437 .rpc_argp = &args,
1438 .rpc_resp = NULL,
1439 };
1440
1441 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1442}
1443
1444static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1445 unsigned int pgbase, unsigned int pglen)
1446{
1447 struct nfs4_exception exception = { };
1448 int err;
1449 do {
1450 err = nfs4_handle_exception(NFS_SERVER(inode),
1451 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1452 &exception);
1453 } while (exception.retry);
1454 return err;
1455}
1456
1457static int _nfs4_proc_read(struct nfs_read_data *rdata)
1458{
1459 int flags = rdata->flags;
1460 struct inode *inode = rdata->inode;
1461 struct nfs_fattr *fattr = rdata->res.fattr;
1462 struct nfs_server *server = NFS_SERVER(inode);
1463 struct rpc_message msg = {
1464 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1465 .rpc_argp = &rdata->args,
1466 .rpc_resp = &rdata->res,
1467 .rpc_cred = rdata->cred,
1468 };
1469 unsigned long timestamp = jiffies;
1470 int status;
1471
1472 dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
1473 (long long) rdata->args.offset);
1474
0e574af1 1475 nfs_fattr_init(fattr);
1da177e4
LT		 1476 status = rpc_call_sync(server->client, &msg, flags);
1477 if (!status)
1478 renew_lease(server, timestamp);
1479 dprintk("NFS reply read: %d\n", status);
1480 return status;
1481}
1482
1483static int nfs4_proc_read(struct nfs_read_data *rdata)
1484{
1485 struct nfs4_exception exception = { };
1486 int err;
1487 do {
1488 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1489 _nfs4_proc_read(rdata),
1490 &exception);
1491 } while (exception.retry);
1492 return err;
1493}
1494
1495static int _nfs4_proc_write(struct nfs_write_data *wdata)
1496{
1497 int rpcflags = wdata->flags;
1498 struct inode *inode = wdata->inode;
1499 struct nfs_fattr *fattr = wdata->res.fattr;
1500 struct nfs_server *server = NFS_SERVER(inode);
1501 struct rpc_message msg = {
1502 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1503 .rpc_argp = &wdata->args,
1504 .rpc_resp = &wdata->res,
1505 .rpc_cred = wdata->cred,
1506 };
1507 int status;
1508
1509 dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
1510 (long long) wdata->args.offset);
1511
0e574af1 1512 nfs_fattr_init(fattr);
1da177e4
LT		 1513 status = rpc_call_sync(server->client, &msg, rpcflags);
1514 dprintk("NFS reply write: %d\n", status);
1515 return status;
1516}
1517
1518static int nfs4_proc_write(struct nfs_write_data *wdata)
1519{
1520 struct nfs4_exception exception = { };
1521 int err;
1522 do {
1523 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1524 _nfs4_proc_write(wdata),
1525 &exception);
1526 } while (exception.retry);
1527 return err;
1528}
1529
1530static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1531{
1532 struct inode *inode = cdata->inode;
1533 struct nfs_fattr *fattr = cdata->res.fattr;
1534 struct nfs_server *server = NFS_SERVER(inode);
1535 struct rpc_message msg = {
1536 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1537 .rpc_argp = &cdata->args,
1538 .rpc_resp = &cdata->res,
1539 .rpc_cred = cdata->cred,
1540 };
1541 int status;
1542
1543 dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
1544 (long long) cdata->args.offset);
1545
0e574af1 1546 nfs_fattr_init(fattr);
1da177e4
LT		 1547 status = rpc_call_sync(server->client, &msg, 0);
1548 dprintk("NFS reply commit: %d\n", status);
1549 return status;
1550}
1551
1552static int nfs4_proc_commit(struct nfs_write_data *cdata)
1553{
1554 struct nfs4_exception exception = { };
1555 int err;
1556 do {
1557 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1558 _nfs4_proc_commit(cdata),
1559 &exception);
1560 } while (exception.retry);
1561 return err;
1562}
1563
1564/*
1565 * Got race?
1566 * We will need to arrange for the VFS layer to provide an atomic open.
1567 * Until then, this create/open method is prone to inefficiency and race
1568 * conditions due to the lookup, create, and open VFS calls from sys_open()
1569 * placed on the wire.
1570 *
1571 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1572 * The file will be opened again in the subsequent VFS open call
1573 * (nfs4_proc_file_open).
1574 *
1575 * The open for read will just hang around to be used by any process that
1576 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1577 */
1578
1579static int
1580nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1581 int flags, struct nameidata *nd)
1da177e4
LT		 1582{
1583 struct nfs4_state *state;
1584 struct rpc_cred *cred;
1585 int status = 0;
1586
1587 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1588 if (IS_ERR(cred)) {
1589 status = PTR_ERR(cred);
1590 goto out;
1591 }
1592 state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1593 put_rpccred(cred);
1594 if (IS_ERR(state)) {
1595 status = PTR_ERR(state);
1596 goto out;
1597 }
1598 d_instantiate(dentry, state->inode);
1599 if (flags & O_EXCL) {
1600 struct nfs_fattr fattr;
1601 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1602 NFS_FH(state->inode), sattr, state);
02a913a7 1603 if (status == 0)
65e4308d 1604 nfs_setattr_update_inode(state->inode, sattr);
02a913a7
TM		 1605 }
1606 if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1607 nfs4_intent_set_file(nd, dentry, state);
1608 else
1609 nfs4_close_state(state, flags);
1da177e4
LT		 1610out:
1611 return status;
1612}
1613
1614static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1615{
16e42959 1616 struct nfs_server *server = NFS_SERVER(dir);
1da177e4
LT		 1617 struct nfs4_remove_arg args = {
1618 .fh = NFS_FH(dir),
1619 .name = name,
16e42959
TM		 1620 .bitmask = server->attr_bitmask,
1621 };
1622 struct nfs_fattr dir_attr;
1623 struct nfs4_remove_res res = {
1624 .server = server,
1625 .dir_attr = &dir_attr,
1da177e4 1626 };
1da177e4
LT		 1627 struct rpc_message msg = {
1628 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1629 .rpc_argp = &args,
1630 .rpc_resp = &res,
1631 };
1632 int status;
1633
16e42959
TM		 1634 nfs_fattr_init(res.dir_attr);
1635 status = rpc_call_sync(server->client, &msg, 0);
1636 if (status == 0) {
1637 update_changeattr(dir, &res.cinfo);
1638 nfs_post_op_update_inode(dir, res.dir_attr);
1639 }
1da177e4
LT		 1640 return status;
1641}
1642
1643static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1644{
1645 struct nfs4_exception exception = { };
1646 int err;
1647 do {
1648 err = nfs4_handle_exception(NFS_SERVER(dir),
1649 _nfs4_proc_remove(dir, name),
1650 &exception);
1651 } while (exception.retry);
1652 return err;
1653}
1654
1655struct unlink_desc {
1656 struct nfs4_remove_arg args;
16e42959
TM		 1657 struct nfs4_remove_res res;
1658 struct nfs_fattr dir_attr;
1da177e4
LT		 1659};
1660
1661static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1662 struct qstr *name)
1663{
16e42959 1664 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1da177e4
LT		 1665 struct unlink_desc *up;
1666
1667 up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1668 if (!up)
1669 return -ENOMEM;
1670
1671 up->args.fh = NFS_FH(dir->d_inode);
1672 up->args.name = name;
16e42959
TM		 1673 up->args.bitmask = server->attr_bitmask;
1674 up->res.server = server;
1675 up->res.dir_attr = &up->dir_attr;
1da177e4
LT		 1676
1677 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1678 msg->rpc_argp = &up->args;
1679 msg->rpc_resp = &up->res;
1680 return 0;
1681}
1682
1683static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1684{
1685 struct rpc_message *msg = &task->tk_msg;
1686 struct unlink_desc *up;
1687
1688 if (msg->rpc_resp != NULL) {
1689 up = container_of(msg->rpc_resp, struct unlink_desc, res);
16e42959
TM		 1690 update_changeattr(dir->d_inode, &up->res.cinfo);
1691 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1da177e4
LT		 1692 kfree(up);
1693 msg->rpc_resp = NULL;
1694 msg->rpc_argp = NULL;
1695 }
1696 return 0;
1697}
1698
1699static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1700 struct inode *new_dir, struct qstr *new_name)
1701{
6caf2c82 1702 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1703 struct nfs4_rename_arg arg = {
1704 .old_dir = NFS_FH(old_dir),
1705 .new_dir = NFS_FH(new_dir),
1706 .old_name = old_name,
1707 .new_name = new_name,
6caf2c82
TM		 1708 .bitmask = server->attr_bitmask,
1709 };
1710 struct nfs_fattr old_fattr, new_fattr;
1711 struct nfs4_rename_res res = {
1712 .server = server,
1713 .old_fattr = &old_fattr,
1714 .new_fattr = &new_fattr,
1da177e4 1715 };
1da177e4
LT		 1716 struct rpc_message msg = {
1717 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1718 .rpc_argp = &arg,
1719 .rpc_resp = &res,
1720 };
1721 int status;
1722
6caf2c82
TM		 1723 nfs_fattr_init(res.old_fattr);
1724 nfs_fattr_init(res.new_fattr);
1725 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 1726
1727 if (!status) {
1728 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 1729 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 1730 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 1731 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 1732 }
1733 return status;
1734}
1735
1736static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1737 struct inode *new_dir, struct qstr *new_name)
1738{
1739 struct nfs4_exception exception = { };
1740 int err;
1741 do {
1742 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1743 _nfs4_proc_rename(old_dir, old_name,
1744 new_dir, new_name),
1745 &exception);
1746 } while (exception.retry);
1747 return err;
1748}
1749
1750static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1751{
91ba2eee 1752 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1753 struct nfs4_link_arg arg = {
1754 .fh = NFS_FH(inode),
1755 .dir_fh = NFS_FH(dir),
1756 .name = name,
91ba2eee
TM		 1757 .bitmask = server->attr_bitmask,
1758 };
1759 struct nfs_fattr fattr, dir_attr;
1760 struct nfs4_link_res res = {
1761 .server = server,
1762 .fattr = &fattr,
1763 .dir_attr = &dir_attr,
1da177e4 1764 };
1da177e4
LT		 1765 struct rpc_message msg = {
1766 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1767 .rpc_argp = &arg,
91ba2eee 1768 .rpc_resp = &res,
1da177e4
LT		 1769 };
1770 int status;
1771
91ba2eee
TM		 1772 nfs_fattr_init(res.fattr);
1773 nfs_fattr_init(res.dir_attr);
1774 status = rpc_call_sync(server->client, &msg, 0);
1775 if (!status) {
1776 update_changeattr(dir, &res.cinfo);
1777 nfs_post_op_update_inode(dir, res.dir_attr);
1778 nfs_refresh_inode(inode, res.fattr);
1779 }
1da177e4
LT		 1780
1781 return status;
1782}
1783
1784static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1785{
1786 struct nfs4_exception exception = { };
1787 int err;
1788 do {
1789 err = nfs4_handle_exception(NFS_SERVER(inode),
1790 _nfs4_proc_link(inode, dir, name),
1791 &exception);
1792 } while (exception.retry);
1793 return err;
1794}
1795
1796static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1797 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1798 struct nfs_fattr *fattr)
1799{
1800 struct nfs_server *server = NFS_SERVER(dir);
56ae19f3 1801 struct nfs_fattr dir_fattr;
1da177e4
LT		 1802 struct nfs4_create_arg arg = {
1803 .dir_fh = NFS_FH(dir),
1804 .server = server,
1805 .name = name,
1806 .attrs = sattr,
1807 .ftype = NF4LNK,
1808 .bitmask = server->attr_bitmask,
1809 };
1810 struct nfs4_create_res res = {
1811 .server = server,
1812 .fh = fhandle,
1813 .fattr = fattr,
56ae19f3 1814 .dir_fattr = &dir_fattr,
1da177e4
LT		 1815 };
1816 struct rpc_message msg = {
1817 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1818 .rpc_argp = &arg,
1819 .rpc_resp = &res,
1820 };
1821 int status;
1822
1823 if (path->len > NFS4_MAXPATHLEN)
1824 return -ENAMETOOLONG;
1825 arg.u.symlink = path;
0e574af1 1826 nfs_fattr_init(fattr);
56ae19f3 1827 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1828
1829 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1830 if (!status)
1831 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 1832 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 1833 return status;
1834}
1835
1836static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1837 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1838 struct nfs_fattr *fattr)
1839{
1840 struct nfs4_exception exception = { };
1841 int err;
1842 do {
1843 err = nfs4_handle_exception(NFS_SERVER(dir),
1844 _nfs4_proc_symlink(dir, name, path, sattr,
1845 fhandle, fattr),
1846 &exception);
1847 } while (exception.retry);
1848 return err;
1849}
1850
1851static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1852 struct iattr *sattr)
1853{
1854 struct nfs_server *server = NFS_SERVER(dir);
1855 struct nfs_fh fhandle;
56ae19f3 1856 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 1857 struct nfs4_create_arg arg = {
1858 .dir_fh = NFS_FH(dir),
1859 .server = server,
1860 .name = &dentry->d_name,
1861 .attrs = sattr,
1862 .ftype = NF4DIR,
1863 .bitmask = server->attr_bitmask,
1864 };
1865 struct nfs4_create_res res = {
1866 .server = server,
1867 .fh = &fhandle,
1868 .fattr = &fattr,
56ae19f3 1869 .dir_fattr = &dir_fattr,
1da177e4
LT		 1870 };
1871 struct rpc_message msg = {
1872 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1873 .rpc_argp = &arg,
1874 .rpc_resp = &res,
1875 };
1876 int status;
1877
0e574af1 1878 nfs_fattr_init(&fattr);
56ae19f3 1879 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1880
1881 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1882 if (!status) {
1883 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 1884 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 1885 status = nfs_instantiate(dentry, &fhandle, &fattr);
1886 }
1887 return status;
1888}
1889
1890static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1891 struct iattr *sattr)
1892{
1893 struct nfs4_exception exception = { };
1894 int err;
1895 do {
1896 err = nfs4_handle_exception(NFS_SERVER(dir),
1897 _nfs4_proc_mkdir(dir, dentry, sattr),
1898 &exception);
1899 } while (exception.retry);
1900 return err;
1901}
1902
1903static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1904 u64 cookie, struct page *page, unsigned int count, int plus)
1905{
1906 struct inode *dir = dentry->d_inode;
1907 struct nfs4_readdir_arg args = {
1908 .fh = NFS_FH(dir),
1909 .pages = &page,
1910 .pgbase = 0,
1911 .count = count,
1912 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1913 };
1914 struct nfs4_readdir_res res;
1915 struct rpc_message msg = {
1916 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1917 .rpc_argp = &args,
1918 .rpc_resp = &res,
1919 .rpc_cred = cred,
1920 };
1921 int status;
1922
eadf4598
TM		 1923 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1924 dentry->d_parent->d_name.name,
1925 dentry->d_name.name,
1926 (unsigned long long)cookie);
1da177e4
LT		 1927 lock_kernel();
1928 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1929 res.pgbase = args.pgbase;
1930 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1931 if (status == 0)
1932 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1933 unlock_kernel();
eadf4598 1934 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 1935 return status;
1936}
1937
1938static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1939 u64 cookie, struct page *page, unsigned int count, int plus)
1940{
1941 struct nfs4_exception exception = { };
1942 int err;
1943 do {
1944 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1945 _nfs4_proc_readdir(dentry, cred, cookie,
1946 page, count, plus),
1947 &exception);
1948 } while (exception.retry);
1949 return err;
1950}
1951
1952static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1953 struct iattr *sattr, dev_t rdev)
1954{
1955 struct nfs_server *server = NFS_SERVER(dir);
1956 struct nfs_fh fh;
56ae19f3 1957 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 1958 struct nfs4_create_arg arg = {
1959 .dir_fh = NFS_FH(dir),
1960 .server = server,
1961 .name = &dentry->d_name,
1962 .attrs = sattr,
1963 .bitmask = server->attr_bitmask,
1964 };
1965 struct nfs4_create_res res = {
1966 .server = server,
1967 .fh = &fh,
1968 .fattr = &fattr,
56ae19f3 1969 .dir_fattr = &dir_fattr,
1da177e4
LT		 1970 };
1971 struct rpc_message msg = {
1972 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1973 .rpc_argp = &arg,
1974 .rpc_resp = &res,
1975 };
1976 int status;
1977 int mode = sattr->ia_mode;
1978
0e574af1 1979 nfs_fattr_init(&fattr);
56ae19f3 1980 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1981
1982 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1983 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1984 if (S_ISFIFO(mode))
1985 arg.ftype = NF4FIFO;
1986 else if (S_ISBLK(mode)) {
1987 arg.ftype = NF4BLK;
1988 arg.u.device.specdata1 = MAJOR(rdev);
1989 arg.u.device.specdata2 = MINOR(rdev);
1990 }
1991 else if (S_ISCHR(mode)) {
1992 arg.ftype = NF4CHR;
1993 arg.u.device.specdata1 = MAJOR(rdev);
1994 arg.u.device.specdata2 = MINOR(rdev);
1995 }
1996 else
1997 arg.ftype = NF4SOCK;
1998
1999 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2000 if (status == 0) {
2001 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2002 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2003 status = nfs_instantiate(dentry, &fh, &fattr);
2004 }
2005 return status;
2006}
2007
2008static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2009 struct iattr *sattr, dev_t rdev)
2010{
2011 struct nfs4_exception exception = { };
2012 int err;
2013 do {
2014 err = nfs4_handle_exception(NFS_SERVER(dir),
2015 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2016 &exception);
2017 } while (exception.retry);
2018 return err;
2019}
2020
2021static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2022 struct nfs_fsstat *fsstat)
2023{
2024 struct nfs4_statfs_arg args = {
2025 .fh = fhandle,
2026 .bitmask = server->attr_bitmask,
2027 };
2028 struct rpc_message msg = {
2029 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2030 .rpc_argp = &args,
2031 .rpc_resp = fsstat,
2032 };
2033
0e574af1 2034 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2035 return rpc_call_sync(server->client, &msg, 0);
2036}
2037
2038static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2039{
2040 struct nfs4_exception exception = { };
2041 int err;
2042 do {
2043 err = nfs4_handle_exception(server,
2044 _nfs4_proc_statfs(server, fhandle, fsstat),
2045 &exception);
2046 } while (exception.retry);
2047 return err;
2048}
2049
2050static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2051 struct nfs_fsinfo *fsinfo)
2052{
2053 struct nfs4_fsinfo_arg args = {
2054 .fh = fhandle,
2055 .bitmask = server->attr_bitmask,
2056 };
2057 struct rpc_message msg = {
2058 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2059 .rpc_argp = &args,
2060 .rpc_resp = fsinfo,
2061 };
2062
2063 return rpc_call_sync(server->client, &msg, 0);
2064}
2065
2066static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2067{
2068 struct nfs4_exception exception = { };
2069 int err;
2070
2071 do {
2072 err = nfs4_handle_exception(server,
2073 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2074 &exception);
2075 } while (exception.retry);
2076 return err;
2077}
2078
2079static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2080{
0e574af1 2081 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2082 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2083}
2084
2085static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2086 struct nfs_pathconf *pathconf)
2087{
2088 struct nfs4_pathconf_arg args = {
2089 .fh = fhandle,
2090 .bitmask = server->attr_bitmask,
2091 };
2092 struct rpc_message msg = {
2093 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2094 .rpc_argp = &args,
2095 .rpc_resp = pathconf,
2096 };
2097
2098 /* None of the pathconf attributes are mandatory to implement */
2099 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2100 memset(pathconf, 0, sizeof(*pathconf));
2101 return 0;
2102 }
2103
0e574af1 2104 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2105 return rpc_call_sync(server->client, &msg, 0);
2106}
2107
2108static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2109 struct nfs_pathconf *pathconf)
2110{
2111 struct nfs4_exception exception = { };
2112 int err;
2113
2114 do {
2115 err = nfs4_handle_exception(server,
2116 _nfs4_proc_pathconf(server, fhandle, pathconf),
2117 &exception);
2118 } while (exception.retry);
2119 return err;
2120}
2121
2122static void
2123nfs4_read_done(struct rpc_task *task)
2124{
2125 struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2126 struct inode *inode = data->inode;
2127
2128 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2129 rpc_restart_call(task);
2130 return;
2131 }
2132 if (task->tk_status > 0)
2133 renew_lease(NFS_SERVER(inode), data->timestamp);
2134 /* Call back common NFS readpage processing */
2135 nfs_readpage_result(task);
2136}
2137
2138static void
2139nfs4_proc_read_setup(struct nfs_read_data *data)
2140{
2141 struct rpc_task *task = &data->task;
2142 struct rpc_message msg = {
2143 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2144 .rpc_argp = &data->args,
2145 .rpc_resp = &data->res,
2146 .rpc_cred = data->cred,
2147 };
2148 struct inode *inode = data->inode;
2149 int flags;
2150
2151 data->timestamp = jiffies;
2152
2153 /* N.B. Do we need to test? Never called for swapfile inode */
2154 flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2155
2156 /* Finalize the task. */
2157 rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2158 rpc_call_setup(task, &msg, 0);
2159}
2160
2161static void
2162nfs4_write_done(struct rpc_task *task)
2163{
2164 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2165 struct inode *inode = data->inode;
2166
2167 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2168 rpc_restart_call(task);
2169 return;
2170 }
4f9838c7 2171 if (task->tk_status >= 0) {
1da177e4 2172 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2173 nfs_post_op_update_inode(inode, data->res.fattr);
2174 }
1da177e4
LT		 2175 /* Call back common NFS writeback processing */
2176 nfs_writeback_done(task);
2177}
2178
2179static void
2180nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2181{
2182 struct rpc_task *task = &data->task;
2183 struct rpc_message msg = {
2184 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2185 .rpc_argp = &data->args,
2186 .rpc_resp = &data->res,
2187 .rpc_cred = data->cred,
2188 };
2189 struct inode *inode = data->inode;
4f9838c7 2190 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2191 int stable;
2192 int flags;
2193
2194 if (how & FLUSH_STABLE) {
2195 if (!NFS_I(inode)->ncommit)
2196 stable = NFS_FILE_SYNC;
2197 else
2198 stable = NFS_DATA_SYNC;
2199 } else
2200 stable = NFS_UNSTABLE;
2201 data->args.stable = stable;
4f9838c7
TM		 2202 data->args.bitmask = server->attr_bitmask;
2203 data->res.server = server;
1da177e4
LT		 2204
2205 data->timestamp = jiffies;
2206
2207 /* Set the initial flags for the task. */
2208 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2209
2210 /* Finalize the task. */
2211 rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2212 rpc_call_setup(task, &msg, 0);
2213}
2214
2215static void
2216nfs4_commit_done(struct rpc_task *task)
2217{
2218 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2219 struct inode *inode = data->inode;
2220
2221 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2222 rpc_restart_call(task);
2223 return;
2224 }
4f9838c7
TM		 2225 if (task->tk_status >= 0)
2226 nfs_post_op_update_inode(inode, data->res.fattr);
1da177e4
LT		 2227 /* Call back common NFS writeback processing */
2228 nfs_commit_done(task);
2229}
2230
2231static void
2232nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2233{
2234 struct rpc_task *task = &data->task;
2235 struct rpc_message msg = {
2236 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2237 .rpc_argp = &data->args,
2238 .rpc_resp = &data->res,
2239 .rpc_cred = data->cred,
2240 };
2241 struct inode *inode = data->inode;
4f9838c7 2242 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2243 int flags;
2244
4f9838c7
TM		 2245 data->args.bitmask = server->attr_bitmask;
2246 data->res.server = server;
2247
1da177e4
LT		 2248 /* Set the initial flags for the task. */
2249 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2250
2251 /* Finalize the task. */
2252 rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2253 rpc_call_setup(task, &msg, 0);
2254}
2255
2256/*
2257 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2258 * standalone procedure for queueing an asynchronous RENEW.
2259 */
2260static void
2261renew_done(struct rpc_task *task)
2262{
2263 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2264 unsigned long timestamp = (unsigned long)task->tk_calldata;
2265
2266 if (task->tk_status < 0) {
2267 switch (task->tk_status) {
2268 case -NFS4ERR_STALE_CLIENTID:
2269 case -NFS4ERR_EXPIRED:
2270 case -NFS4ERR_CB_PATH_DOWN:
2271 nfs4_schedule_state_recovery(clp);
2272 }
2273 return;
2274 }
2275 spin_lock(&clp->cl_lock);
2276 if (time_before(clp->cl_last_renewal,timestamp))
2277 clp->cl_last_renewal = timestamp;
2278 spin_unlock(&clp->cl_lock);
2279}
2280
2281int
2282nfs4_proc_async_renew(struct nfs4_client *clp)
2283{
2284 struct rpc_message msg = {
2285 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2286 .rpc_argp = clp,
2287 .rpc_cred = clp->cl_cred,
2288 };
2289
2290 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2291 renew_done, (void *)jiffies);
2292}
2293
2294int
2295nfs4_proc_renew(struct nfs4_client *clp)
2296{
2297 struct rpc_message msg = {
2298 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2299 .rpc_argp = clp,
2300 .rpc_cred = clp->cl_cred,
2301 };
2302 unsigned long now = jiffies;
2303 int status;
2304
2305 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2306 if (status < 0)
2307 return status;
2308 spin_lock(&clp->cl_lock);
2309 if (time_before(clp->cl_last_renewal,now))
2310 clp->cl_last_renewal = now;
2311 spin_unlock(&clp->cl_lock);
2312 return 0;
2313}
2314
aa1870af
BF		 2315static inline int nfs4_server_supports_acls(struct nfs_server *server)
2316{
2317 return (server->caps & NFS_CAP_ACLS)
2318 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2319 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2320}
2321
2322/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2323 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2324 * the stack.
2325 */
2326#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2327
2328static void buf_to_pages(const void *buf, size_t buflen,
2329 struct page **pages, unsigned int *pgbase)
2330{
2331 const void *p = buf;
2332
2333 *pgbase = offset_in_page(buf);
2334 p -= *pgbase;
2335 while (p < buf + buflen) {
2336 *(pages++) = virt_to_page(p);
2337 p += PAGE_CACHE_SIZE;
2338 }
2339}
2340
e50a1c2e
BF		 2341struct nfs4_cached_acl {
2342 int cached;
2343 size_t len;
3e9d4154 2344 char data[0];
e50a1c2e
BF		 2345};
2346
2347static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2348{
2349 struct nfs_inode *nfsi = NFS_I(inode);
2350
2351 spin_lock(&inode->i_lock);
2352 kfree(nfsi->nfs4_acl);
2353 nfsi->nfs4_acl = acl;
2354 spin_unlock(&inode->i_lock);
2355}
2356
2357static void nfs4_zap_acl_attr(struct inode *inode)
2358{
2359 nfs4_set_cached_acl(inode, NULL);
2360}
2361
2362static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2363{
2364 struct nfs_inode *nfsi = NFS_I(inode);
2365 struct nfs4_cached_acl *acl;
2366 int ret = -ENOENT;
2367
2368 spin_lock(&inode->i_lock);
2369 acl = nfsi->nfs4_acl;
2370 if (acl == NULL)
2371 goto out;
2372 if (buf == NULL) /* user is just asking for length */
2373 goto out_len;
2374 if (acl->cached == 0)
2375 goto out;
2376 ret = -ERANGE; /* see getxattr(2) man page */
2377 if (acl->len > buflen)
2378 goto out;
2379 memcpy(buf, acl->data, acl->len);
2380out_len:
2381 ret = acl->len;
2382out:
2383 spin_unlock(&inode->i_lock);
2384 return ret;
2385}
2386
2387static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2388{
2389 struct nfs4_cached_acl *acl;
2390
2391 if (buf && acl_len <= PAGE_SIZE) {
2392 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2393 if (acl == NULL)
2394 goto out;
2395 acl->cached = 1;
2396 memcpy(acl->data, buf, acl_len);
2397 } else {
2398 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2399 if (acl == NULL)
2400 goto out;
2401 acl->cached = 0;
2402 }
2403 acl->len = acl_len;
2404out:
2405 nfs4_set_cached_acl(inode, acl);
2406}
2407
2408static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2409{
aa1870af
BF		 2410 struct page *pages[NFS4ACL_MAXPAGES];
2411 struct nfs_getaclargs args = {
2412 .fh = NFS_FH(inode),
2413 .acl_pages = pages,
2414 .acl_len = buflen,
2415 };
2416 size_t resp_len = buflen;
e50a1c2e 2417 void *resp_buf;
aa1870af
BF		 2418 struct rpc_message msg = {
2419 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2420 .rpc_argp = &args,
2421 .rpc_resp = &resp_len,
2422 };
e50a1c2e 2423 struct page *localpage = NULL;
aa1870af
BF		 2424 int ret;
2425
e50a1c2e
BF		 2426 if (buflen < PAGE_SIZE) {
2427 /* As long as we're doing a round trip to the server anyway,
2428 * let's be prepared for a page of acl data. */
2429 localpage = alloc_page(GFP_KERNEL);
2430 resp_buf = page_address(localpage);
2431 if (localpage == NULL)
2432 return -ENOMEM;
2433 args.acl_pages[0] = localpage;
2434 args.acl_pgbase = 0;
1d95db8e 2435 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2436 } else {
2437 resp_buf = buf;
2438 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2439 }
aa1870af 2440 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2441 if (ret)
2442 goto out_free;
2443 if (resp_len > args.acl_len)
2444 nfs4_write_cached_acl(inode, NULL, resp_len);
2445 else
2446 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2447 if (buf) {
2448 ret = -ERANGE;
2449 if (resp_len > buflen)
2450 goto out_free;
2451 if (localpage)
2452 memcpy(buf, resp_buf, resp_len);
2453 }
2454 ret = resp_len;
2455out_free:
2456 if (localpage)
2457 __free_page(localpage);
aa1870af
BF		 2458 return ret;
2459}
2460
e50a1c2e
BF		 2461static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2462{
2463 struct nfs_server *server = NFS_SERVER(inode);
2464 int ret;
2465
2466 if (!nfs4_server_supports_acls(server))
2467 return -EOPNOTSUPP;
2468 ret = nfs_revalidate_inode(server, inode);
2469 if (ret < 0)
2470 return ret;
2471 ret = nfs4_read_cached_acl(inode, buf, buflen);
2472 if (ret != -ENOENT)
2473 return ret;
2474 return nfs4_get_acl_uncached(inode, buf, buflen);
2475}
2476
4b580ee3
BF		 2477static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2478{
2479 struct nfs_server *server = NFS_SERVER(inode);
2480 struct page *pages[NFS4ACL_MAXPAGES];
2481 struct nfs_setaclargs arg = {
2482 .fh = NFS_FH(inode),
2483 .acl_pages = pages,
2484 .acl_len = buflen,
2485 };
2486 struct rpc_message msg = {
2487 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2488 .rpc_argp = &arg,
2489 .rpc_resp = NULL,
2490 };
2491 int ret;
2492
2493 if (!nfs4_server_supports_acls(server))
2494 return -EOPNOTSUPP;
642ac549 2495 nfs_inode_return_delegation(inode);
4b580ee3
BF		 2496 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2497 ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
e50a1c2e
BF		 2498 if (ret == 0)
2499 nfs4_write_cached_acl(inode, buf, buflen);
4b580ee3
BF		 2500 return ret;
2501}
2502
1da177e4 2503static int
faf5f49c 2504nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4
LT		 2505{
2506 struct nfs4_client *clp = server->nfs4_state;
2507
2508 if (!clp || task->tk_status >= 0)
2509 return 0;
2510 switch(task->tk_status) {
2511 case -NFS4ERR_STALE_CLIENTID:
2512 case -NFS4ERR_STALE_STATEID:
2513 case -NFS4ERR_EXPIRED:
2514 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2515 nfs4_schedule_state_recovery(clp);
2516 if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2517 rpc_wake_up_task(task);
2518 task->tk_status = 0;
2519 return -EAGAIN;
2520 case -NFS4ERR_GRACE:
2521 case -NFS4ERR_DELAY:
2522 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2523 task->tk_status = 0;
2524 return -EAGAIN;
2525 case -NFS4ERR_OLD_STATEID:
2526 task->tk_status = 0;
2527 return -EAGAIN;
2528 }
2529 task->tk_status = nfs4_map_errors(task->tk_status);
2530 return 0;
2531}
2532
2533static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2534{
2535 DEFINE_WAIT(wait);
2536 sigset_t oldset;
2537 int interruptible, res = 0;
2538
2539 might_sleep();
2540
2541 rpc_clnt_sigmask(clnt, &oldset);
2542 interruptible = TASK_UNINTERRUPTIBLE;
2543 if (clnt->cl_intr)
2544 interruptible = TASK_INTERRUPTIBLE;
2545 prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2546 nfs4_schedule_state_recovery(clp);
2547 if (clnt->cl_intr && signalled())
2548 res = -ERESTARTSYS;
2549 else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2550 schedule();
2551 finish_wait(&clp->cl_waitq, &wait);
2552 rpc_clnt_sigunmask(clnt, &oldset);
2553 return res;
2554}
2555
2556static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2557{
2558 sigset_t oldset;
2559 int res = 0;
2560
2561 might_sleep();
2562
2563 if (*timeout <= 0)
2564 *timeout = NFS4_POLL_RETRY_MIN;
2565 if (*timeout > NFS4_POLL_RETRY_MAX)
2566 *timeout = NFS4_POLL_RETRY_MAX;
2567 rpc_clnt_sigmask(clnt, &oldset);
2568 if (clnt->cl_intr) {
041e0e3b 2569 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2570 if (signalled())
2571 res = -ERESTARTSYS;
041e0e3b
NA		 2572 } else
2573 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2574 rpc_clnt_sigunmask(clnt, &oldset);
2575 *timeout <<= 1;
2576 return res;
2577}
2578
2579/* This is the error handling routine for processes that are allowed
2580 * to sleep.
2581 */
faf5f49c 2582int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4
LT		 2583{
2584 struct nfs4_client *clp = server->nfs4_state;
2585 int ret = errorcode;
2586
2587 exception->retry = 0;
2588 switch(errorcode) {
2589 case 0:
2590 return 0;
2591 case -NFS4ERR_STALE_CLIENTID:
2592 case -NFS4ERR_STALE_STATEID:
2593 case -NFS4ERR_EXPIRED:
2594 ret = nfs4_wait_clnt_recover(server->client, clp);
2595 if (ret == 0)
2596 exception->retry = 1;
2597 break;
2598 case -NFS4ERR_GRACE:
2599 case -NFS4ERR_DELAY:
2600 ret = nfs4_delay(server->client, &exception->timeout);
2601 if (ret == 0)
2602 exception->retry = 1;
2603 break;
2604 case -NFS4ERR_OLD_STATEID:
2605 if (ret == 0)
2606 exception->retry = 1;
2607 }
2608 /* We failed to handle the error */
2609 return nfs4_map_errors(ret);
2610}
2611
2612int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2613{
2614 nfs4_verifier sc_verifier;
2615 struct nfs4_setclientid setclientid = {
2616 .sc_verifier = &sc_verifier,
2617 .sc_prog = program,
2618 };
2619 struct rpc_message msg = {
2620 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2621 .rpc_argp = &setclientid,
2622 .rpc_resp = clp,
2623 .rpc_cred = clp->cl_cred,
2624 };
2625 u32 *p;
2626 int loop = 0;
2627 int status;
2628
2629 p = (u32*)sc_verifier.data;
2630 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2631 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2632
2633 for(;;) {
2634 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2635 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2636 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2637 clp->cl_cred->cr_ops->cr_name,
2638 clp->cl_id_uniquifier);
2639 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2640 sizeof(setclientid.sc_netid), "tcp");
2641 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2642 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2643 clp->cl_ipaddr, port >> 8, port & 255);
2644
2645 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2646 if (status != -NFS4ERR_CLID_INUSE)
2647 break;
2648 if (signalled())
2649 break;
2650 if (loop++ & 1)
2651 ssleep(clp->cl_lease_time + 1);
2652 else
2653 if (++clp->cl_id_uniquifier == 0)
2654 break;
2655 }
2656 return status;
2657}
2658
2659int
2660nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2661{
2662 struct nfs_fsinfo fsinfo;
2663 struct rpc_message msg = {
2664 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2665 .rpc_argp = clp,
2666 .rpc_resp = &fsinfo,
2667 .rpc_cred = clp->cl_cred,
2668 };
2669 unsigned long now;
2670 int status;
2671
2672 now = jiffies;
2673 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2674 if (status == 0) {
2675 spin_lock(&clp->cl_lock);
2676 clp->cl_lease_time = fsinfo.lease_time * HZ;
2677 clp->cl_last_renewal = now;
2678 spin_unlock(&clp->cl_lock);
2679 }
2680 return status;
2681}
2682
2683static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2684{
2685 struct nfs4_delegreturnargs args = {
2686 .fhandle = NFS_FH(inode),
2687 .stateid = stateid,
2688 };
2689 struct rpc_message msg = {
2690 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2691 .rpc_argp = &args,
2692 .rpc_cred = cred,
2693 };
2694
2695 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2696}
2697
2698int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2699{
2700 struct nfs_server *server = NFS_SERVER(inode);
2701 struct nfs4_exception exception = { };
2702 int err;
2703 do {
2704 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2705 switch (err) {
2706 case -NFS4ERR_STALE_STATEID:
2707 case -NFS4ERR_EXPIRED:
2708 nfs4_schedule_state_recovery(server->nfs4_state);
2709 case 0:
2710 return 0;
2711 }
2712 err = nfs4_handle_exception(server, err, &exception);
2713 } while (exception.retry);
2714 return err;
2715}
2716
2717#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2718#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2719
2720/*
2721 * sleep, with exponential backoff, and retry the LOCK operation.
2722 */
2723static unsigned long
2724nfs4_set_lock_task_retry(unsigned long timeout)
2725{
041e0e3b 2726 schedule_timeout_interruptible(timeout);
1da177e4
LT		 2727 timeout <<= 1;
2728 if (timeout > NFS4_LOCK_MAXTIMEOUT)
2729 return NFS4_LOCK_MAXTIMEOUT;
2730 return timeout;
2731}
2732
2733static inline int
2734nfs4_lck_type(int cmd, struct file_lock *request)
2735{
2736 /* set lock type */
2737 switch (request->fl_type) {
2738 case F_RDLCK:
2739 return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2740 case F_WRLCK:
2741 return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2742 case F_UNLCK:
2743 return NFS4_WRITE_LT;
2744 }
2745 BUG();
2746 return 0;
2747}
2748
2749static inline uint64_t
2750nfs4_lck_length(struct file_lock *request)
2751{
2752 if (request->fl_end == OFFSET_MAX)
2753 return ~(uint64_t)0;
2754 return request->fl_end - request->fl_start + 1;
2755}
2756
2757static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2758{
2759 struct inode *inode = state->inode;
2760 struct nfs_server *server = NFS_SERVER(inode);
2761 struct nfs4_client *clp = server->nfs4_state;
2762 struct nfs_lockargs arg = {
2763 .fh = NFS_FH(inode),
2764 .type = nfs4_lck_type(cmd, request),
2765 .offset = request->fl_start,
2766 .length = nfs4_lck_length(request),
2767 };
2768 struct nfs_lockres res = {
2769 .server = server,
2770 };
2771 struct rpc_message msg = {
2772 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2773 .rpc_argp = &arg,
2774 .rpc_resp = &res,
2775 .rpc_cred = state->owner->so_cred,
2776 };
2777 struct nfs_lowner nlo;
2778 struct nfs4_lock_state *lsp;
2779 int status;
2780
2781 down_read(&clp->cl_sem);
2782 nlo.clientid = clp->cl_clientid;
8d0a8a9d
TM		 2783 status = nfs4_set_lock_state(state, request);
2784 if (status != 0)
2785 goto out;
2786 lsp = request->fl_u.nfs4_fl.owner;
2787 nlo.id = lsp->ls_id;
1da177e4
LT		 2788 arg.u.lockt = &nlo;
2789 status = rpc_call_sync(server->client, &msg, 0);
2790 if (!status) {
2791 request->fl_type = F_UNLCK;
2792 } else if (status == -NFS4ERR_DENIED) {
2793 int64_t len, start, end;
2794 start = res.u.denied.offset;
2795 len = res.u.denied.length;
2796 end = start + len - 1;
2797 if (end < 0 || len == 0)
2798 request->fl_end = OFFSET_MAX;
2799 else
2800 request->fl_end = (loff_t)end;
2801 request->fl_start = (loff_t)start;
2802 request->fl_type = F_WRLCK;
2803 if (res.u.denied.type & 1)
2804 request->fl_type = F_RDLCK;
2805 request->fl_pid = 0;
2806 status = 0;
2807 }
8d0a8a9d 2808out:
1da177e4
LT		 2809 up_read(&clp->cl_sem);
2810 return status;
2811}
2812
2813static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2814{
2815 struct nfs4_exception exception = { };
2816 int err;
2817
2818 do {
2819 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2820 _nfs4_proc_getlk(state, cmd, request),
2821 &exception);
2822 } while (exception.retry);
2823 return err;
2824}
2825
2826static int do_vfs_lock(struct file *file, struct file_lock *fl)
2827{
2828 int res = 0;
2829 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2830 case FL_POSIX:
2831 res = posix_lock_file_wait(file, fl);
2832 break;
2833 case FL_FLOCK:
2834 res = flock_lock_file_wait(file, fl);
2835 break;
2836 default:
2837 BUG();
2838 }
2839 if (res < 0)
2840 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2841 __FUNCTION__);
2842 return res;
2843}
2844
faf5f49c
TM		 2845struct nfs4_unlockdata {
2846 struct nfs_lockargs arg;
2847 struct nfs_locku_opargs luargs;
2848 struct nfs_lockres res;
2849 struct nfs4_lock_state *lsp;
2850 struct nfs_open_context *ctx;
2851 atomic_t refcount;
2852 struct completion completion;
2853};
2854
2855static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
1da177e4 2856{
faf5f49c
TM		 2857 if (atomic_dec_and_test(&calldata->refcount)) {
2858 nfs_free_seqid(calldata->luargs.seqid);
2859 nfs4_put_lock_state(calldata->lsp);
2860 put_nfs_open_context(calldata->ctx);
2861 kfree(calldata);
2862 }
2863}
2864
2865static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2866{
2867 complete(&calldata->completion);
2868 nfs4_locku_release_calldata(calldata);
2869}
2870
2871static void nfs4_locku_done(struct rpc_task *task)
2872{
2873 struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2874
2875 nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2876 switch (task->tk_status) {
2877 case 0:
2878 memcpy(calldata->lsp->ls_stateid.data,
2879 calldata->res.u.stateid.data,
2880 sizeof(calldata->lsp->ls_stateid.data));
2881 break;
2882 case -NFS4ERR_STALE_STATEID:
2883 case -NFS4ERR_EXPIRED:
2884 nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2885 break;
2886 default:
2887 if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2888 rpc_restart_call(task);
2889 return;
2890 }
2891 }
2892 nfs4_locku_complete(calldata);
2893}
2894
2895static void nfs4_locku_begin(struct rpc_task *task)
2896{
2897 struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
1da177e4
LT		 2898 struct rpc_message msg = {
2899 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 2900 .rpc_argp = &calldata->arg,
2901 .rpc_resp = &calldata->res,
2902 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 2903 };
faf5f49c
TM		 2904 int status;
2905
2906 status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2907 if (status != 0)
2908 return;
2909 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2910 nfs4_locku_complete(calldata);
2911 task->tk_exit = NULL;
2912 rpc_exit(task, 0);
2913 return;
2914 }
2915 rpc_call_setup(task, &msg, 0);
2916}
2917
2918static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2919{
2920 struct nfs4_unlockdata *calldata;
2921 struct inode *inode = state->inode;
2922 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2923 struct nfs4_lock_state *lsp;
8d0a8a9d 2924 int status;
faf5f49c 2925
8d0a8a9d
TM		 2926 status = nfs4_set_lock_state(state, request);
2927 if (status != 0)
faf5f49c 2928 return status;
8d0a8a9d 2929 lsp = request->fl_u.nfs4_fl.owner;
1da177e4 2930 /* We might have lost the locks! */
8d0a8a9d 2931 if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
faf5f49c
TM		 2932 return 0;
2933 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2934 if (calldata == NULL)
2935 return -ENOMEM;
2936 calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2937 if (calldata->luargs.seqid == NULL) {
2938 kfree(calldata);
2939 return -ENOMEM;
2940 }
2941 calldata->luargs.stateid = &lsp->ls_stateid;
2942 calldata->arg.fh = NFS_FH(inode);
2943 calldata->arg.type = nfs4_lck_type(cmd, request);
2944 calldata->arg.offset = request->fl_start;
2945 calldata->arg.length = nfs4_lck_length(request);
2946 calldata->arg.u.locku = &calldata->luargs;
2947 calldata->res.server = server;
2948 calldata->lsp = lsp;
2949 atomic_inc(&lsp->ls_count);
2950
2951 /* Ensure we don't close file until we're done freeing locks! */
2952 calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2953
2954 atomic_set(&calldata->refcount, 2);
2955 init_completion(&calldata->completion);
2956
2957 status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2958 nfs4_locku_done, calldata);
1da177e4 2959 if (status == 0)
faf5f49c
TM		 2960 wait_for_completion_interruptible(&calldata->completion);
2961 do_vfs_lock(request->fl_file, request);
2962 nfs4_locku_release_calldata(calldata);
1da177e4
LT		 2963 return status;
2964}
2965
1da177e4
LT		 2966static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2967{
2968 struct inode *inode = state->inode;
2969 struct nfs_server *server = NFS_SERVER(inode);
8d0a8a9d 2970 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
06735b34
TM		 2971 struct nfs_lock_opargs largs = {
2972 .lock_stateid = &lsp->ls_stateid,
2973 .open_stateid = &state->stateid,
2974 .lock_owner = {
2975 .clientid = server->nfs4_state->cl_clientid,
2976 .id = lsp->ls_id,
2977 },
2978 .reclaim = reclaim,
2979 };
1da177e4
LT		 2980 struct nfs_lockargs arg = {
2981 .fh = NFS_FH(inode),
2982 .type = nfs4_lck_type(cmd, request),
2983 .offset = request->fl_start,
2984 .length = nfs4_lck_length(request),
06735b34
TM		 2985 .u = {
2986 .lock = &largs,
2987 },
1da177e4
LT		 2988 };
2989 struct nfs_lockres res = {
2990 .server = server,
2991 };
2992 struct rpc_message msg = {
2993 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2994 .rpc_argp = &arg,
2995 .rpc_resp = &res,
2996 .rpc_cred = state->owner->so_cred,
2997 };
cee54fc9 2998 int status = -ENOMEM;
1da177e4 2999
06735b34
TM		 3000 largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3001 if (largs.lock_seqid == NULL)
cee54fc9
TM		 3002 return -ENOMEM;
3003 if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
1da177e4 3004 struct nfs4_state_owner *owner = state->owner;
06735b34
TM		 3005
3006 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
3007 if (largs.open_seqid == NULL)
3008 goto out;
1da177e4 3009 largs.new_lock_owner = 1;
06735b34
TM		 3010 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3011 /* increment open seqid on success, and seqid mutating errors */
3012 if (largs.new_lock_owner != 0) {
3013 nfs_increment_open_seqid(status, largs.open_seqid);
3014 if (status == 0)
3015 nfs_confirm_seqid(&lsp->ls_seqid, 0);
8d0a8a9d 3016 }
06735b34
TM		 3017 nfs_free_seqid(largs.open_seqid);
3018 } else
1da177e4 3019 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
06735b34
TM		 3020 /* increment lock seqid on success, and seqid mutating errors*/
3021 nfs_increment_lock_seqid(status, largs.lock_seqid);
1da177e4 3022 /* save the returned stateid. */
cee54fc9 3023 if (status == 0) {
06735b34
TM		 3024 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
3025 sizeof(lsp->ls_stateid.data));
cee54fc9
TM		 3026 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3027 } else if (status == -NFS4ERR_DENIED)
1da177e4 3028 status = -EAGAIN;
06735b34
TM		 3029out:
3030 nfs_free_seqid(largs.lock_seqid);
1da177e4
LT		 3031 return status;
3032}
3033
3034static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3035{
202b50dc
TM		 3036 struct nfs_server *server = NFS_SERVER(state->inode);
3037 struct nfs4_exception exception = { };
3038 int err;
3039
3040 do {
3041 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3042 if (err != -NFS4ERR_DELAY)
3043 break;
3044 nfs4_handle_exception(server, err, &exception);
3045 } while (exception.retry);
3046 return err;
1da177e4
LT		 3047}
3048
3049static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3050{
202b50dc
TM		 3051 struct nfs_server *server = NFS_SERVER(state->inode);
3052 struct nfs4_exception exception = { };
3053 int err;
3054
3055 do {
3056 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3057 if (err != -NFS4ERR_DELAY)
3058 break;
3059 nfs4_handle_exception(server, err, &exception);
3060 } while (exception.retry);
3061 return err;
1da177e4
LT		 3062}
3063
3064static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3065{
3066 struct nfs4_client *clp = state->owner->so_client;
3067 int status;
3068
3069 down_read(&clp->cl_sem);
8d0a8a9d
TM		 3070 status = nfs4_set_lock_state(state, request);
3071 if (status == 0)
3072 status = _nfs4_do_setlk(state, cmd, request, 0);
1da177e4
LT		 3073 if (status == 0) {
3074 /* Note: we always want to sleep here! */
3075 request->fl_flags |= FL_SLEEP;
3076 if (do_vfs_lock(request->fl_file, request) < 0)
3077 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3078 }
3079 up_read(&clp->cl_sem);
3080 return status;
3081}
3082
3083static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3084{
3085 struct nfs4_exception exception = { };
3086 int err;
3087
3088 do {
3089 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3090 _nfs4_proc_setlk(state, cmd, request),
3091 &exception);
3092 } while (exception.retry);
3093 return err;
3094}
3095
3096static int
3097nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3098{
3099 struct nfs_open_context *ctx;
3100 struct nfs4_state *state;
3101 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3102 int status;
3103
3104 /* verify open state */
3105 ctx = (struct nfs_open_context *)filp->private_data;
3106 state = ctx->state;
3107
3108 if (request->fl_start < 0 || request->fl_end < 0)
3109 return -EINVAL;
3110
3111 if (IS_GETLK(cmd))
3112 return nfs4_proc_getlk(state, F_GETLK, request);
3113
3114 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3115 return -EINVAL;
3116
3117 if (request->fl_type == F_UNLCK)
3118 return nfs4_proc_unlck(state, cmd, request);
3119
3120 do {
3121 status = nfs4_proc_setlk(state, cmd, request);
3122 if ((status != -EAGAIN) || IS_SETLK(cmd))
3123 break;
3124 timeout = nfs4_set_lock_task_retry(timeout);
3125 status = -ERESTARTSYS;
3126 if (signalled())
3127 break;
3128 } while(status < 0);
1da177e4
LT		 3129 return status;
3130}
3131
6b3b5496 3132
aa1870af
BF		 3133#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3134
6b3b5496
BF		 3135int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3136 size_t buflen, int flags)
3137{
4b580ee3
BF		 3138 struct inode *inode = dentry->d_inode;
3139
3140 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3141 return -EOPNOTSUPP;
3142
3143 if (!S_ISREG(inode->i_mode) &&
3144 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3145 return -EPERM;
3146
3147 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3148}
3149
3150/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3151 * and that's what we'll do for e.g. user attributes that haven't been set.
3152 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3153 * attributes in kernel-managed attribute namespaces. */
3154ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3155 size_t buflen)
3156{
aa1870af
BF		 3157 struct inode *inode = dentry->d_inode;
3158
3159 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3160 return -EOPNOTSUPP;
3161
3162 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3163}
3164
3165ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3166{
aa1870af 3167 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496
BF		 3168
3169 if (buf && buflen < len)
3170 return -ERANGE;
3171 if (buf)
aa1870af
BF		 3172 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3173 return len;
6b3b5496
BF		 3174}
3175
1da177e4
LT		 3176struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3177 .recover_open = nfs4_open_reclaim,
3178 .recover_lock = nfs4_lock_reclaim,
3179};
3180
3181struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3182 .recover_open = nfs4_open_expired,
3183 .recover_lock = nfs4_lock_expired,
3184};
3185
6b3b5496
BF		 3186static struct inode_operations nfs4_file_inode_operations = {
3187 .permission = nfs_permission,
3188 .getattr = nfs_getattr,
3189 .setattr = nfs_setattr,
3190 .getxattr = nfs4_getxattr,
3191 .setxattr = nfs4_setxattr,
3192 .listxattr = nfs4_listxattr,
3193};
3194
1da177e4
LT		 3195struct nfs_rpc_ops nfs_v4_clientops = {
3196 .version = 4, /* protocol version */
3197 .dentry_ops = &nfs4_dentry_operations,
3198 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3199 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3200 .getroot = nfs4_proc_get_root,
3201 .getattr = nfs4_proc_getattr,
3202 .setattr = nfs4_proc_setattr,
3203 .lookup = nfs4_proc_lookup,
3204 .access = nfs4_proc_access,
3205 .readlink = nfs4_proc_readlink,
3206 .read = nfs4_proc_read,
3207 .write = nfs4_proc_write,
3208 .commit = nfs4_proc_commit,
3209 .create = nfs4_proc_create,
3210 .remove = nfs4_proc_remove,
3211 .unlink_setup = nfs4_proc_unlink_setup,
3212 .unlink_done = nfs4_proc_unlink_done,
3213 .rename = nfs4_proc_rename,
3214 .link = nfs4_proc_link,
3215 .symlink = nfs4_proc_symlink,
3216 .mkdir = nfs4_proc_mkdir,
3217 .rmdir = nfs4_proc_remove,
3218 .readdir = nfs4_proc_readdir,
3219 .mknod = nfs4_proc_mknod,
3220 .statfs = nfs4_proc_statfs,
3221 .fsinfo = nfs4_proc_fsinfo,
3222 .pathconf = nfs4_proc_pathconf,
3223 .decode_dirent = nfs4_decode_dirent,
3224 .read_setup = nfs4_proc_read_setup,
3225 .write_setup = nfs4_proc_write_setup,
3226 .commit_setup = nfs4_proc_commit_setup,
02a913a7
TM		 3227 .file_open = nfs_open,
3228 .file_release = nfs_release,
1da177e4 3229 .lock = nfs4_proc_lock,
e50a1c2e 3230 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3231};
3232
3233/*
3234 * Local variables:
3235 * c-basic-offset: 8
3236 * End:
3237 */
Linux 6.x block layer and io_uring tree(s)