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