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NFSv4: Ensure asynchronous open() calls always pin the mountpoint
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4 53#include "delegation.h"
006ea73e 54#include "iostat.h"
1da177e4
LT		 55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
2066fe89 58#define NFS4_POLL_RETRY_MIN (HZ/10)
1da177e4
LT		 59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
cdd4e68b 61struct nfs4_opendata;
864472e9 62static int _nfs4_proc_open(struct nfs4_opendata *data);
1da177e4 63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
1da177e4 65static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
faf5f49c 66static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
adfa6f98 67static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
1da177e4 68
1da177e4
LT		 69/* Prevent leaks of NFSv4 errors into userland */
70int nfs4_map_errors(int err)
71{
72 if (err < -1000) {
73 dprintk("%s could not handle NFSv4 error %d\n",
74 __FUNCTION__, -err);
75 return -EIO;
76 }
77 return err;
78}
79
80/*
81 * This is our standard bitmap for GETATTR requests.
82 */
83const u32 nfs4_fattr_bitmap[2] = {
84 FATTR4_WORD0_TYPE
85 | FATTR4_WORD0_CHANGE
86 | FATTR4_WORD0_SIZE
87 | FATTR4_WORD0_FSID
88 | FATTR4_WORD0_FILEID,
89 FATTR4_WORD1_MODE
90 | FATTR4_WORD1_NUMLINKS
91 | FATTR4_WORD1_OWNER
92 | FATTR4_WORD1_OWNER_GROUP
93 | FATTR4_WORD1_RAWDEV
94 | FATTR4_WORD1_SPACE_USED
95 | FATTR4_WORD1_TIME_ACCESS
96 | FATTR4_WORD1_TIME_METADATA
97 | FATTR4_WORD1_TIME_MODIFY
98};
99
100const u32 nfs4_statfs_bitmap[2] = {
101 FATTR4_WORD0_FILES_AVAIL
102 | FATTR4_WORD0_FILES_FREE
103 | FATTR4_WORD0_FILES_TOTAL,
104 FATTR4_WORD1_SPACE_AVAIL
105 | FATTR4_WORD1_SPACE_FREE
106 | FATTR4_WORD1_SPACE_TOTAL
107};
108
4ce79717 109const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 110 FATTR4_WORD0_MAXLINK
111 | FATTR4_WORD0_MAXNAME,
112 0
113};
114
115const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
116 | FATTR4_WORD0_MAXREAD
117 | FATTR4_WORD0_MAXWRITE
118 | FATTR4_WORD0_LEASE_TIME,
119 0
120};
121
830b8e33
MN		 122const u32 nfs4_fs_locations_bitmap[2] = {
123 FATTR4_WORD0_TYPE
124 | FATTR4_WORD0_CHANGE
125 | FATTR4_WORD0_SIZE
126 | FATTR4_WORD0_FSID
127 | FATTR4_WORD0_FILEID
128 | FATTR4_WORD0_FS_LOCATIONS,
129 FATTR4_WORD1_MODE
130 | FATTR4_WORD1_NUMLINKS
131 | FATTR4_WORD1_OWNER
132 | FATTR4_WORD1_OWNER_GROUP
133 | FATTR4_WORD1_RAWDEV
134 | FATTR4_WORD1_SPACE_USED
135 | FATTR4_WORD1_TIME_ACCESS
136 | FATTR4_WORD1_TIME_METADATA
137 | FATTR4_WORD1_TIME_MODIFY
138 | FATTR4_WORD1_MOUNTED_ON_FILEID
139};
140
bc4785cd 141static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
1da177e4
LT		 142 struct nfs4_readdir_arg *readdir)
143{
0dbb4c67 144 __be32 *start, *p;
1da177e4
LT		 145
146 BUG_ON(readdir->count < 80);
147 if (cookie > 2) {
b7ef1956 148 readdir->cookie = cookie;
1da177e4
LT		 149 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
150 return;
151 }
152
153 readdir->cookie = 0;
154 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
155 if (cookie == 2)
156 return;
157
158 /*
159 * NFSv4 servers do not return entries for '.' and '..'
160 * Therefore, we fake these entries here. We let '.'
161 * have cookie 0 and '..' have cookie 1. Note that
162 * when talking to the server, we always send cookie 0
163 * instead of 1 or 2.
164 */
0dbb4c67 165 start = p = kmap_atomic(*readdir->pages, KM_USER0);
1da177e4
LT		 166
167 if (cookie == 0) {
168 *p++ = xdr_one; /* next */
169 *p++ = xdr_zero; /* cookie, first word */
170 *p++ = xdr_one; /* cookie, second word */
171 *p++ = xdr_one; /* entry len */
172 memcpy(p, ".\0\0\0", 4); /* entry */
173 p++;
174 *p++ = xdr_one; /* bitmap length */
175 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
176 *p++ = htonl(8); /* attribute buffer length */
177 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
178 }
179
180 *p++ = xdr_one; /* next */
181 *p++ = xdr_zero; /* cookie, first word */
182 *p++ = xdr_two; /* cookie, second word */
183 *p++ = xdr_two; /* entry len */
184 memcpy(p, "..\0\0", 4); /* entry */
185 p++;
186 *p++ = xdr_one; /* bitmap length */
187 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
188 *p++ = htonl(8); /* attribute buffer length */
189 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
190
191 readdir->pgbase = (char *)p - (char *)start;
192 readdir->count -= readdir->pgbase;
193 kunmap_atomic(start, KM_USER0);
194}
195
26e976a8 196static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
1da177e4 197{
7539bbab 198 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 199 spin_lock(&clp->cl_lock);
200 if (time_before(clp->cl_last_renewal,timestamp))
201 clp->cl_last_renewal = timestamp;
202 spin_unlock(&clp->cl_lock);
203}
204
38478b24 205static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1da177e4 206{
38478b24 207 struct nfs_inode *nfsi = NFS_I(dir);
1da177e4 208
38478b24
TM		 209 spin_lock(&dir->i_lock);
210 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
1da177e4
LT		 211 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
212 nfsi->change_attr = cinfo->after;
38478b24 213 spin_unlock(&dir->i_lock);
1da177e4
LT		 214}
215
e56e0b78 216struct nfs4_opendata {
24ac23ab 217 atomic_t count;
e56e0b78
TM		 218 struct nfs_openargs o_arg;
219 struct nfs_openres o_res;
cdd4e68b
TM		 220 struct nfs_open_confirmargs c_arg;
221 struct nfs_open_confirmres c_res;
e56e0b78
TM		 222 struct nfs_fattr f_attr;
223 struct nfs_fattr dir_attr;
ad389da7 224 struct path path;
e56e0b78
TM		 225 struct dentry *dir;
226 struct nfs4_state_owner *owner;
227 struct iattr attrs;
26e976a8 228 unsigned long timestamp;
24ac23ab
TM		 229 int rpc_status;
230 int cancelled;
e56e0b78
TM		 231};
232
ad389da7 233static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
e56e0b78
TM		 234 struct nfs4_state_owner *sp, int flags,
235 const struct iattr *attrs)
236{
ad389da7 237 struct dentry *parent = dget_parent(path->dentry);
e56e0b78
TM		 238 struct inode *dir = parent->d_inode;
239 struct nfs_server *server = NFS_SERVER(dir);
240 struct nfs4_opendata *p;
241
242 p = kzalloc(sizeof(*p), GFP_KERNEL);
243 if (p == NULL)
244 goto err;
245 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
246 if (p->o_arg.seqid == NULL)
247 goto err_free;
24ac23ab 248 atomic_set(&p->count, 1);
ad389da7
TM		 249 p->path.mnt = mntget(path->mnt);
250 p->path.dentry = dget(path->dentry);
e56e0b78
TM		 251 p->dir = parent;
252 p->owner = sp;
253 atomic_inc(&sp->so_count);
254 p->o_arg.fh = NFS_FH(dir);
255 p->o_arg.open_flags = flags,
7539bbab 256 p->o_arg.clientid = server->nfs_client->cl_clientid;
e56e0b78 257 p->o_arg.id = sp->so_id;
ad389da7 258 p->o_arg.name = &p->path.dentry->d_name;
e56e0b78
TM		 259 p->o_arg.server = server;
260 p->o_arg.bitmask = server->attr_bitmask;
261 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
262 p->o_res.f_attr = &p->f_attr;
263 p->o_res.dir_attr = &p->dir_attr;
264 p->o_res.server = server;
265 nfs_fattr_init(&p->f_attr);
266 nfs_fattr_init(&p->dir_attr);
267 if (flags & O_EXCL) {
268 u32 *s = (u32 *) p->o_arg.u.verifier.data;
269 s[0] = jiffies;
270 s[1] = current->pid;
271 } else if (flags & O_CREAT) {
272 p->o_arg.u.attrs = &p->attrs;
273 memcpy(&p->attrs, attrs, sizeof(p->attrs));
274 }
cdd4e68b
TM		 275 p->c_arg.fh = &p->o_res.fh;
276 p->c_arg.stateid = &p->o_res.stateid;
277 p->c_arg.seqid = p->o_arg.seqid;
e56e0b78
TM		 278 return p;
279err_free:
280 kfree(p);
281err:
282 dput(parent);
283 return NULL;
284}
285
286static void nfs4_opendata_free(struct nfs4_opendata *p)
287{
24ac23ab 288 if (p != NULL && atomic_dec_and_test(&p->count)) {
e56e0b78
TM		 289 nfs_free_seqid(p->o_arg.seqid);
290 nfs4_put_state_owner(p->owner);
291 dput(p->dir);
ad389da7
TM		 292 dput(p->path.dentry);
293 mntput(p->path.mnt);
e56e0b78
TM		 294 kfree(p);
295 }
296}
297
9512135d 298/* Helper for asynchronous RPC calls */
4ce70ada 299static int nfs4_call_async(struct rpc_clnt *clnt,
963d8fe5 300 const struct rpc_call_ops *tk_ops, void *calldata)
9512135d
TM		 301{
302 struct rpc_task *task;
303
963d8fe5 304 if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
9512135d 305 return -ENOMEM;
9512135d
TM		 306 rpc_execute(task);
307 return 0;
308}
309
06f814a3
TM		 310static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
311{
312 sigset_t oldset;
313 int ret;
314
315 rpc_clnt_sigmask(task->tk_client, &oldset);
316 ret = rpc_wait_for_completion_task(task);
317 rpc_clnt_sigunmask(task->tk_client, &oldset);
318 return ret;
319}
320
e7616923
TM		 321static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
322{
323 switch (open_flags) {
324 case FMODE_WRITE:
325 state->n_wronly++;
326 break;
327 case FMODE_READ:
328 state->n_rdonly++;
329 break;
330 case FMODE_READ|FMODE_WRITE:
331 state->n_rdwr++;
332 }
333}
334
1da177e4
LT		 335static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
336{
337 struct inode *inode = state->inode;
338
339 open_flags &= (FMODE_READ|FMODE_WRITE);
d530838b 340 /* Protect against nfs4_find_state_byowner() */
ec073428 341 spin_lock(&state->owner->so_lock);
1da177e4 342 spin_lock(&inode->i_lock);
4cecb76f 343 memcpy(&state->stateid, stateid, sizeof(state->stateid));
e7616923 344 update_open_stateflags(state, open_flags);
4cecb76f 345 nfs4_state_set_mode_locked(state, state->state | open_flags);
1da177e4 346 spin_unlock(&inode->i_lock);
ec073428 347 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 348}
349
24ac23ab
TM		 350static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
351{
352 struct inode *inode;
353 struct nfs4_state *state = NULL;
354
355 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
356 goto out;
357 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
03f28e3a 358 if (IS_ERR(inode))
24ac23ab
TM		 359 goto out;
360 state = nfs4_get_open_state(inode, data->owner);
361 if (state == NULL)
362 goto put_inode;
363 update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
364put_inode:
365 iput(inode);
366out:
367 return state;
368}
369
864472e9
TM		 370static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
371{
372 struct nfs_inode *nfsi = NFS_I(state->inode);
373 struct nfs_open_context *ctx;
374
375 spin_lock(&state->inode->i_lock);
376 list_for_each_entry(ctx, &nfsi->open_files, list) {
377 if (ctx->state != state)
378 continue;
379 get_nfs_open_context(ctx);
380 spin_unlock(&state->inode->i_lock);
381 return ctx;
382 }
383 spin_unlock(&state->inode->i_lock);
384 return ERR_PTR(-ENOENT);
385}
386
387static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
388{
389 int ret;
390
391 opendata->o_arg.open_flags = openflags;
392 ret = _nfs4_proc_open(opendata);
393 if (ret != 0)
394 return ret;
395 memcpy(stateid->data, opendata->o_res.stateid.data,
396 sizeof(stateid->data));
397 return 0;
398}
399
400static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
401{
402 nfs4_stateid stateid;
403 struct nfs4_state *newstate;
404 int mode = 0;
405 int delegation = 0;
406 int ret;
407
408 /* memory barrier prior to reading state->n_* */
409 smp_rmb();
410 if (state->n_rdwr != 0) {
411 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
412 if (ret != 0)
413 return ret;
414 mode |= FMODE_READ|FMODE_WRITE;
415 if (opendata->o_res.delegation_type != 0)
416 delegation = opendata->o_res.delegation_type;
417 smp_rmb();
418 }
419 if (state->n_wronly != 0) {
420 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
421 if (ret != 0)
422 return ret;
423 mode |= FMODE_WRITE;
424 if (opendata->o_res.delegation_type != 0)
425 delegation = opendata->o_res.delegation_type;
426 smp_rmb();
427 }
428 if (state->n_rdonly != 0) {
429 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
430 if (ret != 0)
431 return ret;
432 mode |= FMODE_READ;
433 }
434 clear_bit(NFS_DELEGATED_STATE, &state->flags);
435 if (mode == 0)
436 return 0;
437 if (opendata->o_res.delegation_type == 0)
438 opendata->o_res.delegation_type = delegation;
439 opendata->o_arg.open_flags |= mode;
440 newstate = nfs4_opendata_to_nfs4_state(opendata);
441 if (newstate != NULL) {
442 if (opendata->o_res.delegation_type != 0) {
443 struct nfs_inode *nfsi = NFS_I(newstate->inode);
444 int delegation_flags = 0;
445 if (nfsi->delegation)
446 delegation_flags = nfsi->delegation->flags;
447 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
448 nfs_inode_set_delegation(newstate->inode,
449 opendata->owner->so_cred,
450 &opendata->o_res);
451 else
452 nfs_inode_reclaim_delegation(newstate->inode,
453 opendata->owner->so_cred,
454 &opendata->o_res);
455 }
456 nfs4_close_state(newstate, opendata->o_arg.open_flags);
457 }
458 if (newstate != state)
459 return -ESTALE;
460 return 0;
461}
462
1da177e4
LT		 463/*
464 * OPEN_RECLAIM:
465 * reclaim state on the server after a reboot.
1da177e4 466 */
539cd03a 467static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 468{
864472e9
TM		 469 struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
470 struct nfs4_opendata *opendata;
471 int delegation_type = 0;
1da177e4
LT		 472 int status;
473
474 if (delegation != NULL) {
475 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
476 memcpy(&state->stateid, &delegation->stateid,
477 sizeof(state->stateid));
478 set_bit(NFS_DELEGATED_STATE, &state->flags);
479 return 0;
480 }
864472e9 481 delegation_type = delegation->type;
1da177e4 482 }
ad389da7 483 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
864472e9 484 if (opendata == NULL)
cee54fc9 485 return -ENOMEM;
864472e9
TM		 486 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
487 opendata->o_arg.fh = NFS_FH(state->inode);
488 nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
489 opendata->o_arg.u.delegation_type = delegation_type;
490 status = nfs4_open_recover(opendata, state);
491 nfs4_opendata_free(opendata);
1da177e4
LT		 492 return status;
493}
494
539cd03a 495static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 496{
497 struct nfs_server *server = NFS_SERVER(state->inode);
498 struct nfs4_exception exception = { };
499 int err;
500 do {
539cd03a 501 err = _nfs4_do_open_reclaim(ctx, state);
202b50dc
TM		 502 if (err != -NFS4ERR_DELAY)
503 break;
504 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 505 } while (exception.retry);
506 return err;
507}
508
864472e9
TM		 509static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
510{
511 struct nfs_open_context *ctx;
512 int ret;
513
514 ctx = nfs4_state_find_open_context(state);
515 if (IS_ERR(ctx))
516 return PTR_ERR(ctx);
539cd03a 517 ret = nfs4_do_open_reclaim(ctx, state);
864472e9
TM		 518 put_nfs_open_context(ctx);
519 return ret;
520}
521
539cd03a 522static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 523{
524 struct nfs4_state_owner *sp = state->owner;
e56e0b78 525 struct nfs4_opendata *opendata;
864472e9 526 int ret;
1da177e4 527
1da177e4 528 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
864472e9 529 return 0;
ad389da7 530 opendata = nfs4_opendata_alloc(&ctx->path, sp, 0, NULL);
e56e0b78 531 if (opendata == NULL)
864472e9 532 return -ENOMEM;
e56e0b78 533 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
e56e0b78
TM		 534 memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
535 sizeof(opendata->o_arg.u.delegation.data));
864472e9 536 ret = nfs4_open_recover(opendata, state);
e56e0b78 537 nfs4_opendata_free(opendata);
864472e9 538 return ret;
1da177e4
LT		 539}
540
539cd03a 541int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4
LT		 542{
543 struct nfs4_exception exception = { };
539cd03a 544 struct nfs_server *server = NFS_SERVER(state->inode);
1da177e4
LT		 545 int err;
546 do {
539cd03a 547 err = _nfs4_open_delegation_recall(ctx, state);
1da177e4
LT		 548 switch (err) {
549 case 0:
550 return err;
551 case -NFS4ERR_STALE_CLIENTID:
552 case -NFS4ERR_STALE_STATEID:
553 case -NFS4ERR_EXPIRED:
554 /* Don't recall a delegation if it was lost */
7539bbab 555 nfs4_schedule_state_recovery(server->nfs_client);
1da177e4
LT		 556 return err;
557 }
558 err = nfs4_handle_exception(server, err, &exception);
559 } while (exception.retry);
560 return err;
561}
562
cdd4e68b 563static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1da177e4 564{
cdd4e68b
TM		 565 struct nfs4_opendata *data = calldata;
566 struct rpc_message msg = {
567 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
568 .rpc_argp = &data->c_arg,
569 .rpc_resp = &data->c_res,
570 .rpc_cred = data->owner->so_cred,
1da177e4 571 };
26e976a8 572 data->timestamp = jiffies;
cdd4e68b
TM		 573 rpc_call_setup(task, &msg, 0);
574}
575
576static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
577{
578 struct nfs4_opendata *data = calldata;
579
580 data->rpc_status = task->tk_status;
581 if (RPC_ASSASSINATED(task))
582 return;
26e976a8 583 if (data->rpc_status == 0) {
cdd4e68b
TM		 584 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
585 sizeof(data->o_res.stateid.data));
26e976a8
TM		 586 renew_lease(data->o_res.server, data->timestamp);
587 }
cdd4e68b
TM		 588 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
589 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
590}
591
592static void nfs4_open_confirm_release(void *calldata)
593{
594 struct nfs4_opendata *data = calldata;
595 struct nfs4_state *state = NULL;
596
597 /* If this request hasn't been cancelled, do nothing */
598 if (data->cancelled == 0)
599 goto out_free;
600 /* In case of error, no cleanup! */
601 if (data->rpc_status != 0)
602 goto out_free;
603 nfs_confirm_seqid(&data->owner->so_seqid, 0);
604 state = nfs4_opendata_to_nfs4_state(data);
605 if (state != NULL)
606 nfs4_close_state(state, data->o_arg.open_flags);
607out_free:
608 nfs4_opendata_free(data);
609}
610
611static const struct rpc_call_ops nfs4_open_confirm_ops = {
612 .rpc_call_prepare = nfs4_open_confirm_prepare,
613 .rpc_call_done = nfs4_open_confirm_done,
614 .rpc_release = nfs4_open_confirm_release,
615};
616
617/*
618 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
619 */
620static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
621{
622 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
623 struct rpc_task *task;
1da177e4
LT		 624 int status;
625
cdd4e68b 626 atomic_inc(&data->count);
7a1218a2
TM		 627 /*
628 * If rpc_run_task() ends up calling ->rpc_release(), we
629 * want to ensure that it takes the 'error' code path.
630 */
631 data->rpc_status = -ENOMEM;
cdd4e68b 632 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
7a1218a2 633 if (IS_ERR(task))
cdd4e68b 634 return PTR_ERR(task);
cdd4e68b
TM		 635 status = nfs4_wait_for_completion_rpc_task(task);
636 if (status != 0) {
637 data->cancelled = 1;
638 smp_wmb();
639 } else
640 status = data->rpc_status;
e6b3c4db 641 rpc_put_task(task);
1da177e4
LT		 642 return status;
643}
644
24ac23ab 645static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1da177e4 646{
24ac23ab
TM		 647 struct nfs4_opendata *data = calldata;
648 struct nfs4_state_owner *sp = data->owner;
1da177e4
LT		 649 struct rpc_message msg = {
650 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
24ac23ab
TM		 651 .rpc_argp = &data->o_arg,
652 .rpc_resp = &data->o_res,
1da177e4
LT		 653 .rpc_cred = sp->so_cred,
654 };
24ac23ab
TM		 655
656 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
657 return;
658 /* Update sequence id. */
659 data->o_arg.id = sp->so_id;
660 data->o_arg.clientid = sp->so_client->cl_clientid;
864472e9
TM		 661 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
662 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
26e976a8 663 data->timestamp = jiffies;
24ac23ab
TM		 664 rpc_call_setup(task, &msg, 0);
665}
1da177e4 666
24ac23ab
TM		 667static void nfs4_open_done(struct rpc_task *task, void *calldata)
668{
669 struct nfs4_opendata *data = calldata;
1da177e4 670
24ac23ab
TM		 671 data->rpc_status = task->tk_status;
672 if (RPC_ASSASSINATED(task))
673 return;
674 if (task->tk_status == 0) {
675 switch (data->o_res.f_attr->mode & S_IFMT) {
6f926b5b
TM		 676 case S_IFREG:
677 break;
678 case S_IFLNK:
24ac23ab 679 data->rpc_status = -ELOOP;
6f926b5b
TM		 680 break;
681 case S_IFDIR:
24ac23ab 682 data->rpc_status = -EISDIR;
6f926b5b
TM		 683 break;
684 default:
24ac23ab 685 data->rpc_status = -ENOTDIR;
6f926b5b 686 }
26e976a8 687 renew_lease(data->o_res.server, data->timestamp);
6f926b5b 688 }
24ac23ab
TM		 689 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
690}
6f926b5b 691
24ac23ab
TM		 692static void nfs4_open_release(void *calldata)
693{
694 struct nfs4_opendata *data = calldata;
695 struct nfs4_state *state = NULL;
696
697 /* If this request hasn't been cancelled, do nothing */
698 if (data->cancelled == 0)
699 goto out_free;
700 /* In case of error, no cleanup! */
701 if (data->rpc_status != 0)
702 goto out_free;
703 /* In case we need an open_confirm, no cleanup! */
704 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
705 goto out_free;
706 nfs_confirm_seqid(&data->owner->so_seqid, 0);
707 state = nfs4_opendata_to_nfs4_state(data);
708 if (state != NULL)
709 nfs4_close_state(state, data->o_arg.open_flags);
710out_free:
711 nfs4_opendata_free(data);
712}
713
714static const struct rpc_call_ops nfs4_open_ops = {
715 .rpc_call_prepare = nfs4_open_prepare,
716 .rpc_call_done = nfs4_open_done,
717 .rpc_release = nfs4_open_release,
718};
719
720/*
721 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
722 */
723static int _nfs4_proc_open(struct nfs4_opendata *data)
724{
725 struct inode *dir = data->dir->d_inode;
726 struct nfs_server *server = NFS_SERVER(dir);
727 struct nfs_openargs *o_arg = &data->o_arg;
728 struct nfs_openres *o_res = &data->o_res;
729 struct rpc_task *task;
730 int status;
731
732 atomic_inc(&data->count);
7a1218a2
TM		 733 /*
734 * If rpc_run_task() ends up calling ->rpc_release(), we
735 * want to ensure that it takes the 'error' code path.
736 */
737 data->rpc_status = -ENOMEM;
24ac23ab 738 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
7a1218a2 739 if (IS_ERR(task))
24ac23ab 740 return PTR_ERR(task);
24ac23ab
TM		 741 status = nfs4_wait_for_completion_rpc_task(task);
742 if (status != 0) {
743 data->cancelled = 1;
744 smp_wmb();
745 } else
746 status = data->rpc_status;
e6b3c4db 747 rpc_put_task(task);
1da177e4 748 if (status != 0)
24ac23ab
TM		 749 return status;
750
56ae19f3
TM		 751 if (o_arg->open_flags & O_CREAT) {
752 update_changeattr(dir, &o_res->cinfo);
753 nfs_post_op_update_inode(dir, o_res->dir_attr);
754 } else
755 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4 756 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
cdd4e68b 757 status = _nfs4_proc_open_confirm(data);
1da177e4 758 if (status != 0)
24ac23ab 759 return status;
1da177e4 760 }
24ac23ab 761 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1da177e4 762 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
8fa5c000 763 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
24ac23ab 764 return 0;
1da177e4
LT		 765}
766
767static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
768{
769 struct nfs_access_entry cache;
770 int mask = 0;
771 int status;
772
773 if (openflags & FMODE_READ)
774 mask |= MAY_READ;
775 if (openflags & FMODE_WRITE)
776 mask |= MAY_WRITE;
777 status = nfs_access_get_cached(inode, cred, &cache);
778 if (status == 0)
779 goto out;
780
781 /* Be clever: ask server to check for all possible rights */
782 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
783 cache.cred = cred;
784 cache.jiffies = jiffies;
785 status = _nfs4_proc_access(inode, &cache);
786 if (status != 0)
787 return status;
788 nfs_access_add_cache(inode, &cache);
789out:
790 if ((cache.mask & mask) == mask)
791 return 0;
792 return -EACCES;
793}
794
10afec90 795static int nfs4_recover_expired_lease(struct nfs_server *server)
58d9714a 796{
7539bbab 797 struct nfs_client *clp = server->nfs_client;
6b30954e 798 int ret;
58d9714a 799
6b30954e
TM		 800 for (;;) {
801 ret = nfs4_wait_clnt_recover(server->client, clp);
802 if (ret != 0)
803 return ret;
804 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
805 break;
58d9714a 806 nfs4_schedule_state_recovery(clp);
6b30954e
TM		 807 }
808 return 0;
58d9714a
TM		 809}
810
1da177e4
LT		 811/*
812 * OPEN_EXPIRED:
813 * reclaim state on the server after a network partition.
814 * Assumes caller holds the appropriate lock
815 */
539cd03a 816static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1da177e4 817{
1da177e4 818 struct inode *inode = state->inode;
1da177e4 819 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
e56e0b78 820 struct nfs4_opendata *opendata;
24ac23ab 821 int openflags = state->state & (FMODE_READ|FMODE_WRITE);
864472e9 822 int ret;
1da177e4
LT		 823
824 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
539cd03a 825 ret = _nfs4_do_access(inode, ctx->cred, openflags);
864472e9
TM		 826 if (ret < 0)
827 return ret;
1da177e4
LT		 828 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
829 set_bit(NFS_DELEGATED_STATE, &state->flags);
864472e9 830 return 0;
1da177e4 831 }
ad389da7 832 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, openflags, NULL);
e56e0b78 833 if (opendata == NULL)
864472e9
TM		 834 return -ENOMEM;
835 ret = nfs4_open_recover(opendata, state);
836 if (ret == -ESTALE) {
837 /* Invalidate the state owner so we don't ever use it again */
539cd03a
TM		 838 nfs4_drop_state_owner(state->owner);
839 d_drop(ctx->path.dentry);
1da177e4 840 }
e56e0b78 841 nfs4_opendata_free(opendata);
864472e9 842 return ret;
1da177e4
LT		 843}
844
539cd03a 845static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
202b50dc 846{
539cd03a 847 struct nfs_server *server = NFS_SERVER(state->inode);
202b50dc
TM		 848 struct nfs4_exception exception = { };
849 int err;
850
851 do {
539cd03a 852 err = _nfs4_open_expired(ctx, state);
202b50dc
TM		 853 if (err == -NFS4ERR_DELAY)
854 nfs4_handle_exception(server, err, &exception);
855 } while (exception.retry);
856 return err;
857}
858
1da177e4
LT		 859static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
860{
1da177e4 861 struct nfs_open_context *ctx;
864472e9 862 int ret;
1da177e4 863
864472e9
TM		 864 ctx = nfs4_state_find_open_context(state);
865 if (IS_ERR(ctx))
866 return PTR_ERR(ctx);
539cd03a 867 ret = nfs4_do_open_expired(ctx, state);
864472e9
TM		 868 put_nfs_open_context(ctx);
869 return ret;
1da177e4
LT		 870}
871
872/*
24ac23ab 873 * Returns a referenced nfs4_state if there is an open delegation on the file
1da177e4
LT		 874 */
875static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
876{
877 struct nfs_delegation *delegation;
878 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 879 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 880 struct nfs_inode *nfsi = NFS_I(inode);
881 struct nfs4_state_owner *sp = NULL;
882 struct nfs4_state *state = NULL;
883 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
884 int err;
885
b4454fe1
TM		 886 err = -ENOMEM;
887 if (!(sp = nfs4_get_state_owner(server, cred))) {
888 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
889 return err;
890 }
58d9714a
TM		 891 err = nfs4_recover_expired_lease(server);
892 if (err != 0)
b4454fe1 893 goto out_put_state_owner;
1da177e4
LT		 894 /* Protect against reboot recovery - NOTE ORDER! */
895 down_read(&clp->cl_sem);
896 /* Protect against delegation recall */
897 down_read(&nfsi->rwsem);
898 delegation = NFS_I(inode)->delegation;
899 err = -ENOENT;
900 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
901 goto out_err;
902 err = -ENOMEM;
1da177e4
LT		 903 state = nfs4_get_open_state(inode, sp);
904 if (state == NULL)
905 goto out_err;
906
907 err = -ENOENT;
908 if ((state->state & open_flags) == open_flags) {
909 spin_lock(&inode->i_lock);
e7616923 910 update_open_stateflags(state, open_flags);
1da177e4
LT		 911 spin_unlock(&inode->i_lock);
912 goto out_ok;
913 } else if (state->state != 0)
b4454fe1 914 goto out_put_open_state;
1da177e4
LT		 915
916 lock_kernel();
917 err = _nfs4_do_access(inode, cred, open_flags);
918 unlock_kernel();
919 if (err != 0)
b4454fe1 920 goto out_put_open_state;
1da177e4
LT		 921 set_bit(NFS_DELEGATED_STATE, &state->flags);
922 update_open_stateid(state, &delegation->stateid, open_flags);
923out_ok:
1da177e4
LT		 924 nfs4_put_state_owner(sp);
925 up_read(&nfsi->rwsem);
926 up_read(&clp->cl_sem);
1da177e4 927 *res = state;
b4454fe1
TM		 928 return 0;
929out_put_open_state:
930 nfs4_put_open_state(state);
1da177e4 931out_err:
1da177e4
LT		 932 up_read(&nfsi->rwsem);
933 up_read(&clp->cl_sem);
b8e5c4c2
TM		 934 if (err != -EACCES)
935 nfs_inode_return_delegation(inode);
b4454fe1
TM		 936out_put_state_owner:
937 nfs4_put_state_owner(sp);
1da177e4
LT		 938 return err;
939}
940
941static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
942{
943 struct nfs4_exception exception = { };
a162a6b8 944 struct nfs4_state *res = ERR_PTR(-EIO);
1da177e4
LT		 945 int err;
946
947 do {
948 err = _nfs4_open_delegated(inode, flags, cred, &res);
949 if (err == 0)
950 break;
951 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
952 err, &exception));
953 } while (exception.retry);
954 return res;
955}
956
957/*
24ac23ab 958 * Returns a referenced nfs4_state
1da177e4 959 */
ad389da7 960static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1da177e4
LT		 961{
962 struct nfs4_state_owner *sp;
963 struct nfs4_state *state = NULL;
964 struct nfs_server *server = NFS_SERVER(dir);
7539bbab 965 struct nfs_client *clp = server->nfs_client;
e56e0b78 966 struct nfs4_opendata *opendata;
1da177e4 967 int status;
1da177e4
LT		 968
969 /* Protect against reboot recovery conflicts */
1da177e4
LT		 970 status = -ENOMEM;
971 if (!(sp = nfs4_get_state_owner(server, cred))) {
972 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
973 goto out_err;
974 }
58d9714a
TM		 975 status = nfs4_recover_expired_lease(server);
976 if (status != 0)
b4454fe1 977 goto err_put_state_owner;
58d9714a
TM		 978 down_read(&clp->cl_sem);
979 status = -ENOMEM;
ad389da7 980 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
e56e0b78 981 if (opendata == NULL)
76723de0 982 goto err_release_rwsem;
1da177e4 983
24ac23ab 984 status = _nfs4_proc_open(opendata);
1da177e4 985 if (status != 0)
e56e0b78 986 goto err_opendata_free;
1da177e4
LT		 987
988 status = -ENOMEM;
24ac23ab
TM		 989 state = nfs4_opendata_to_nfs4_state(opendata);
990 if (state == NULL)
e56e0b78 991 goto err_opendata_free;
e56e0b78 992 if (opendata->o_res.delegation_type != 0)
24ac23ab 993 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
e56e0b78 994 nfs4_opendata_free(opendata);
1da177e4
LT		 995 nfs4_put_state_owner(sp);
996 up_read(&clp->cl_sem);
997 *res = state;
998 return 0;
e56e0b78
TM		 999err_opendata_free:
1000 nfs4_opendata_free(opendata);
76723de0
TM		 1001err_release_rwsem:
1002 up_read(&clp->cl_sem);
e56e0b78
TM		 1003err_put_state_owner:
1004 nfs4_put_state_owner(sp);
1da177e4 1005out_err:
1da177e4
LT		 1006 *res = NULL;
1007 return status;
1008}
1009
1010
ad389da7 1011static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1da177e4
LT		 1012{
1013 struct nfs4_exception exception = { };
1014 struct nfs4_state *res;
1015 int status;
1016
1017 do {
ad389da7 1018 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1da177e4
LT		 1019 if (status == 0)
1020 break;
1021 /* NOTE: BAD_SEQID means the server and client disagree about the
1022 * book-keeping w.r.t. state-changing operations
1023 * (OPEN/CLOSE/LOCK/LOCKU...)
1024 * It is actually a sign of a bug on the client or on the server.
1025 *
1026 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 1027 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 1028 * have unhashed the old state_owner for us, and that we can
1029 * therefore safely retry using a new one. We should still warn
1030 * the user though...
1031 */
1032 if (status == -NFS4ERR_BAD_SEQID) {
1033 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1034 exception.retry = 1;
1035 continue;
1036 }
550f5747
TM		 1037 /*
1038 * BAD_STATEID on OPEN means that the server cancelled our
1039 * state before it received the OPEN_CONFIRM.
1040 * Recover by retrying the request as per the discussion
1041 * on Page 181 of RFC3530.
1042 */
1043 if (status == -NFS4ERR_BAD_STATEID) {
1044 exception.retry = 1;
1045 continue;
1046 }
1da177e4
LT		 1047 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1048 status, &exception));
1049 } while (exception.retry);
1050 return res;
1051}
1052
3e4f6290
TM		 1053static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1054 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1055{
3e4f6290 1056 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1057 struct nfs_setattrargs arg = {
3e4f6290 1058 .fh = NFS_FH(inode),
1da177e4
LT		 1059 .iap = sattr,
1060 .server = server,
1061 .bitmask = server->attr_bitmask,
1062 };
1063 struct nfs_setattrres res = {
1064 .fattr = fattr,
1065 .server = server,
1066 };
1067 struct rpc_message msg = {
1068 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1069 .rpc_argp = &arg,
1070 .rpc_resp = &res,
1071 };
26e976a8 1072 unsigned long timestamp = jiffies;
65e4308d 1073 int status;
1da177e4 1074
0e574af1 1075 nfs_fattr_init(fattr);
1da177e4 1076
3e4f6290
TM		 1077 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1078 /* Use that stateid */
1079 } else if (state != NULL) {
1da177e4 1080 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 1081 nfs4_copy_stateid(&arg.stateid, state, current->files);
1082 } else
1da177e4
LT		 1083 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1084
65e4308d 1085 status = rpc_call_sync(server->client, &msg, 0);
26e976a8
TM		 1086 if (status == 0 && state != NULL)
1087 renew_lease(server, timestamp);
65e4308d 1088 return status;
1da177e4
LT		 1089}
1090
3e4f6290
TM		 1091static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1092 struct iattr *sattr, struct nfs4_state *state)
1da177e4 1093{
3e4f6290 1094 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1095 struct nfs4_exception exception = { };
1096 int err;
1097 do {
1098 err = nfs4_handle_exception(server,
3e4f6290 1099 _nfs4_do_setattr(inode, fattr, sattr, state),
1da177e4
LT		 1100 &exception);
1101 } while (exception.retry);
1102 return err;
1103}
1104
1105struct nfs4_closedata {
1106 struct inode *inode;
1107 struct nfs4_state *state;
1108 struct nfs_closeargs arg;
1109 struct nfs_closeres res;
516a6af6 1110 struct nfs_fattr fattr;
26e976a8 1111 unsigned long timestamp;
1da177e4
LT		 1112};
1113
963d8fe5 1114static void nfs4_free_closedata(void *data)
9512135d 1115{
963d8fe5
TM		 1116 struct nfs4_closedata *calldata = data;
1117 struct nfs4_state_owner *sp = calldata->state->owner;
9512135d
TM		 1118
1119 nfs4_put_open_state(calldata->state);
1120 nfs_free_seqid(calldata->arg.seqid);
9512135d 1121 nfs4_put_state_owner(sp);
9512135d
TM		 1122 kfree(calldata);
1123}
1124
963d8fe5 1125static void nfs4_close_done(struct rpc_task *task, void *data)
1da177e4 1126{
963d8fe5 1127 struct nfs4_closedata *calldata = data;
1da177e4 1128 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1129 struct nfs_server *server = NFS_SERVER(calldata->inode);
1130
4ce70ada
TM		 1131 if (RPC_ASSASSINATED(task))
1132 return;
1da177e4
LT		 1133 /* hmm. we are done with the inode, and in the process of freeing
1134 * the state_owner. we keep this around to process errors
1135 */
cee54fc9 1136 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 1137 switch (task->tk_status) {
1138 case 0:
1139 memcpy(&state->stateid, &calldata->res.stateid,
1140 sizeof(state->stateid));
26e976a8 1141 renew_lease(server, calldata->timestamp);
1da177e4
LT		 1142 break;
1143 case -NFS4ERR_STALE_STATEID:
1144 case -NFS4ERR_EXPIRED:
1da177e4
LT		 1145 break;
1146 default:
1147 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1148 rpc_restart_call(task);
1149 return;
1150 }
1151 }
516a6af6 1152 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1da177e4
LT		 1153}
1154
4ce70ada 1155static void nfs4_close_prepare(struct rpc_task *task, void *data)
1da177e4 1156{
4ce70ada 1157 struct nfs4_closedata *calldata = data;
9512135d 1158 struct nfs4_state *state = calldata->state;
1da177e4
LT		 1159 struct rpc_message msg = {
1160 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1161 .rpc_argp = &calldata->arg,
1162 .rpc_resp = &calldata->res,
9512135d 1163 .rpc_cred = state->owner->so_cred,
1da177e4 1164 };
4cecb76f 1165 int mode = 0, old_mode;
9512135d 1166
963d8fe5 1167 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
9512135d 1168 return;
9512135d
TM		 1169 /* Recalculate the new open mode in case someone reopened the file
1170 * while we were waiting in line to be scheduled.
1171 */
4cecb76f
TM		 1172 spin_lock(&state->owner->so_lock);
1173 spin_lock(&calldata->inode->i_lock);
1174 mode = old_mode = state->state;
e7616923
TM		 1175 if (state->n_rdwr == 0) {
1176 if (state->n_rdonly == 0)
1177 mode &= ~FMODE_READ;
1178 if (state->n_wronly == 0)
1179 mode &= ~FMODE_WRITE;
1180 }
4cecb76f
TM		 1181 nfs4_state_set_mode_locked(state, mode);
1182 spin_unlock(&calldata->inode->i_lock);
1183 spin_unlock(&state->owner->so_lock);
1184 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
963d8fe5
TM		 1185 /* Note: exit _without_ calling nfs4_close_done */
1186 task->tk_action = NULL;
9512135d
TM		 1187 return;
1188 }
516a6af6 1189 nfs_fattr_init(calldata->res.fattr);
9512135d 1190 if (mode != 0)
1da177e4 1191 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d 1192 calldata->arg.open_flags = mode;
26e976a8 1193 calldata->timestamp = jiffies;
9512135d 1194 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 1195}
1196
963d8fe5 1197static const struct rpc_call_ops nfs4_close_ops = {
4ce70ada 1198 .rpc_call_prepare = nfs4_close_prepare,
963d8fe5
TM		 1199 .rpc_call_done = nfs4_close_done,
1200 .rpc_release = nfs4_free_closedata,
1201};
1202
1da177e4
LT		 1203/*
1204 * It is possible for data to be read/written from a mem-mapped file
1205 * after the sys_close call (which hits the vfs layer as a flush).
1206 * This means that we can't safely call nfsv4 close on a file until
1207 * the inode is cleared. This in turn means that we are not good
1208 * NFSv4 citizens - we do not indicate to the server to update the file's
1209 * share state even when we are done with one of the three share
1210 * stateid's in the inode.
1211 *
1212 * NOTE: Caller must be holding the sp->so_owner semaphore!
1213 */
4cecb76f 1214int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1da177e4 1215{
516a6af6 1216 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 1217 struct nfs4_closedata *calldata;
9512135d 1218 int status = -ENOMEM;
1da177e4 1219
9512135d 1220 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 1221 if (calldata == NULL)
9512135d 1222 goto out;
1da177e4
LT		 1223 calldata->inode = inode;
1224 calldata->state = state;
1225 calldata->arg.fh = NFS_FH(inode);
9512135d 1226 calldata->arg.stateid = &state->stateid;
1da177e4 1227 /* Serialization for the sequence id */
cee54fc9 1228 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 1229 if (calldata->arg.seqid == NULL)
1230 goto out_free_calldata;
516a6af6
TM		 1231 calldata->arg.bitmask = server->attr_bitmask;
1232 calldata->res.fattr = &calldata->fattr;
1233 calldata->res.server = server;
9512135d 1234
4ce70ada 1235 status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
9512135d
TM		 1236 if (status == 0)
1237 goto out;
1238
1239 nfs_free_seqid(calldata->arg.seqid);
1240out_free_calldata:
1241 kfree(calldata);
1242out:
1243 return status;
1da177e4
LT		 1244}
1245
95cf959b 1246static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
02a913a7
TM		 1247{
1248 struct file *filp;
1249
1250 filp = lookup_instantiate_filp(nd, dentry, NULL);
1251 if (!IS_ERR(filp)) {
1252 struct nfs_open_context *ctx;
1253 ctx = (struct nfs_open_context *)filp->private_data;
1254 ctx->state = state;
95cf959b
TM		 1255 return 0;
1256 }
1257 nfs4_close_state(state, nd->intent.open.flags);
1258 return PTR_ERR(filp);
02a913a7
TM		 1259}
1260
1261struct dentry *
1da177e4
LT		 1262nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1263{
ad389da7
TM		 1264 struct path path = {
1265 .mnt = nd->mnt,
1266 .dentry = dentry,
1267 };
1da177e4
LT		 1268 struct iattr attr;
1269 struct rpc_cred *cred;
1270 struct nfs4_state *state;
02a913a7 1271 struct dentry *res;
1da177e4
LT		 1272
1273 if (nd->flags & LOOKUP_CREATE) {
1274 attr.ia_mode = nd->intent.open.create_mode;
1275 attr.ia_valid = ATTR_MODE;
1276 if (!IS_POSIXACL(dir))
1277 attr.ia_mode &= ~current->fs->umask;
1278 } else {
1279 attr.ia_valid = 0;
1280 BUG_ON(nd->intent.open.flags & O_CREAT);
1281 }
1282
1f163415 1283 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4 1284 if (IS_ERR(cred))
02a913a7 1285 return (struct dentry *)cred;
ad389da7 1286 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1da177e4 1287 put_rpccred(cred);
02a913a7
TM		 1288 if (IS_ERR(state)) {
1289 if (PTR_ERR(state) == -ENOENT)
1290 d_add(dentry, NULL);
1291 return (struct dentry *)state;
1292 }
24ac23ab 1293 res = d_add_unique(dentry, igrab(state->inode));
02a913a7
TM		 1294 if (res != NULL)
1295 dentry = res;
1296 nfs4_intent_set_file(nd, dentry, state);
1297 return res;
1da177e4
LT		 1298}
1299
1300int
02a913a7 1301nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4 1302{
ad389da7
TM		 1303 struct path path = {
1304 .mnt = nd->mnt,
1305 .dentry = dentry,
1306 };
1da177e4
LT		 1307 struct rpc_cred *cred;
1308 struct nfs4_state *state;
1da177e4 1309
1f163415 1310 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1311 if (IS_ERR(cred))
1312 return PTR_ERR(cred);
1313 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1314 if (IS_ERR(state))
ad389da7 1315 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1da177e4 1316 put_rpccred(cred);
02a913a7
TM		 1317 if (IS_ERR(state)) {
1318 switch (PTR_ERR(state)) {
1319 case -EPERM:
1320 case -EACCES:
1321 case -EDQUOT:
1322 case -ENOSPC:
1323 case -EROFS:
1324 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1325 return 1;
b87c0adf
CL		 1326 default:
1327 goto out_drop;
02a913a7 1328 }
02a913a7 1329 }
24ac23ab 1330 if (state->inode == dentry->d_inode) {
02a913a7 1331 nfs4_intent_set_file(nd, dentry, state);
1da177e4
LT		 1332 return 1;
1333 }
1da177e4 1334 nfs4_close_state(state, openflags);
02a913a7
TM		 1335out_drop:
1336 d_drop(dentry);
1da177e4
LT		 1337 return 0;
1338}
1339
1340
1341static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1342{
1343 struct nfs4_server_caps_res res = {};
1344 struct rpc_message msg = {
1345 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1346 .rpc_argp = fhandle,
1347 .rpc_resp = &res,
1348 };
1349 int status;
1350
1351 status = rpc_call_sync(server->client, &msg, 0);
1352 if (status == 0) {
1353 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1354 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1355 server->caps |= NFS_CAP_ACLS;
1356 if (res.has_links != 0)
1357 server->caps |= NFS_CAP_HARDLINKS;
1358 if (res.has_symlinks != 0)
1359 server->caps |= NFS_CAP_SYMLINKS;
1360 server->acl_bitmask = res.acl_bitmask;
1361 }
1362 return status;
1363}
1364
55a97593 1365int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1da177e4
LT		 1366{
1367 struct nfs4_exception exception = { };
1368 int err;
1369 do {
1370 err = nfs4_handle_exception(server,
1371 _nfs4_server_capabilities(server, fhandle),
1372 &exception);
1373 } while (exception.retry);
1374 return err;
1375}
1376
1377static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1378 struct nfs_fsinfo *info)
1379{
1da177e4
LT		 1380 struct nfs4_lookup_root_arg args = {
1381 .bitmask = nfs4_fattr_bitmap,
1382 };
1383 struct nfs4_lookup_res res = {
1384 .server = server,
0e574af1 1385 .fattr = info->fattr,
1da177e4
LT		 1386 .fh = fhandle,
1387 };
1388 struct rpc_message msg = {
1389 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1390 .rpc_argp = &args,
1391 .rpc_resp = &res,
1392 };
0e574af1 1393 nfs_fattr_init(info->fattr);
1da177e4
LT		 1394 return rpc_call_sync(server->client, &msg, 0);
1395}
1396
1397static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1398 struct nfs_fsinfo *info)
1399{
1400 struct nfs4_exception exception = { };
1401 int err;
1402 do {
1403 err = nfs4_handle_exception(server,
1404 _nfs4_lookup_root(server, fhandle, info),
1405 &exception);
1406 } while (exception.retry);
1407 return err;
1408}
1409
54ceac45
DH		 1410/*
1411 * get the file handle for the "/" directory on the server
1412 */
1da177e4 1413static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54ceac45 1414 struct nfs_fsinfo *info)
1da177e4 1415{
1da177e4
LT		 1416 int status;
1417
1da177e4 1418 status = nfs4_lookup_root(server, fhandle, info);
1da177e4
LT		 1419 if (status == 0)
1420 status = nfs4_server_capabilities(server, fhandle);
1421 if (status == 0)
1422 status = nfs4_do_fsinfo(server, fhandle, info);
c12e87f4 1423 return nfs4_map_errors(status);
1da177e4
LT		 1424}
1425
6b97fd3d
MN		 1426/*
1427 * Get locations and (maybe) other attributes of a referral.
1428 * Note that we'll actually follow the referral later when
1429 * we detect fsid mismatch in inode revalidation
1430 */
1431static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1432{
1433 int status = -ENOMEM;
1434 struct page *page = NULL;
1435 struct nfs4_fs_locations *locations = NULL;
6b97fd3d
MN		 1436
1437 page = alloc_page(GFP_KERNEL);
1438 if (page == NULL)
1439 goto out;
1440 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1441 if (locations == NULL)
1442 goto out;
1443
c228fd3a 1444 status = nfs4_proc_fs_locations(dir, name, locations, page);
6b97fd3d
MN		 1445 if (status != 0)
1446 goto out;
1447 /* Make sure server returned a different fsid for the referral */
1448 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1449 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1450 status = -EIO;
1451 goto out;
1452 }
1453
1454 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1455 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1456 if (!fattr->mode)
1457 fattr->mode = S_IFDIR;
1458 memset(fhandle, 0, sizeof(struct nfs_fh));
1459out:
1460 if (page)
1461 __free_page(page);
1462 if (locations)
1463 kfree(locations);
1464 return status;
1465}
1466
1da177e4
LT		 1467static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1468{
1469 struct nfs4_getattr_arg args = {
1470 .fh = fhandle,
1471 .bitmask = server->attr_bitmask,
1472 };
1473 struct nfs4_getattr_res res = {
1474 .fattr = fattr,
1475 .server = server,
1476 };
1477 struct rpc_message msg = {
1478 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1479 .rpc_argp = &args,
1480 .rpc_resp = &res,
1481 };
1482
0e574af1 1483 nfs_fattr_init(fattr);
1da177e4
LT		 1484 return rpc_call_sync(server->client, &msg, 0);
1485}
1486
1487static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1488{
1489 struct nfs4_exception exception = { };
1490 int err;
1491 do {
1492 err = nfs4_handle_exception(server,
1493 _nfs4_proc_getattr(server, fhandle, fattr),
1494 &exception);
1495 } while (exception.retry);
1496 return err;
1497}
1498
1499/*
1500 * The file is not closed if it is opened due to the a request to change
1501 * the size of the file. The open call will not be needed once the
1502 * VFS layer lookup-intents are implemented.
1503 *
1504 * Close is called when the inode is destroyed.
1505 * If we haven't opened the file for O_WRONLY, we
1506 * need to in the size_change case to obtain a stateid.
1507 *
1508 * Got race?
1509 * Because OPEN is always done by name in nfsv4, it is
1510 * possible that we opened a different file by the same
1511 * name. We can recognize this race condition, but we
1512 * can't do anything about it besides returning an error.
1513 *
1514 * This will be fixed with VFS changes (lookup-intent).
1515 */
1516static int
1517nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1518 struct iattr *sattr)
1519{
08e9eac4
TM		 1520 struct rpc_cred *cred;
1521 struct inode *inode = dentry->d_inode;
d530838b
TM		 1522 struct nfs_open_context *ctx;
1523 struct nfs4_state *state = NULL;
1da177e4
LT		 1524 int status;
1525
0e574af1 1526 nfs_fattr_init(fattr);
1da177e4 1527
1f163415 1528 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
08e9eac4
TM		 1529 if (IS_ERR(cred))
1530 return PTR_ERR(cred);
d530838b
TM		 1531
1532 /* Search for an existing open(O_WRITE) file */
1533 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1534 if (ctx != NULL)
1535 state = ctx->state;
08e9eac4 1536
3e4f6290 1537 status = nfs4_do_setattr(inode, fattr, sattr, state);
65e4308d
TM		 1538 if (status == 0)
1539 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1540 if (ctx != NULL)
1541 put_nfs_open_context(ctx);
08e9eac4 1542 put_rpccred(cred);
1da177e4
LT		 1543 return status;
1544}
1545
2b3de441
DH		 1546static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1547 struct qstr *name, struct nfs_fh *fhandle,
1548 struct nfs_fattr *fattr)
1549{
1550 int status;
1551 struct nfs4_lookup_arg args = {
1552 .bitmask = server->attr_bitmask,
1553 .dir_fh = dirfh,
1554 .name = name,
1555 };
1556 struct nfs4_lookup_res res = {
1557 .server = server,
1558 .fattr = fattr,
1559 .fh = fhandle,
1560 };
1561 struct rpc_message msg = {
1562 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1563 .rpc_argp = &args,
1564 .rpc_resp = &res,
1565 };
1566
1567 nfs_fattr_init(fattr);
1568
1569 dprintk("NFS call lookupfh %s\n", name->name);
1570 status = rpc_call_sync(server->client, &msg, 0);
1571 dprintk("NFS reply lookupfh: %d\n", status);
1572 if (status == -NFS4ERR_MOVED)
1573 status = -EREMOTE;
1574 return status;
1575}
1576
1577static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1578 struct qstr *name, struct nfs_fh *fhandle,
1579 struct nfs_fattr *fattr)
1580{
1581 struct nfs4_exception exception = { };
1582 int err;
1583 do {
1584 err = nfs4_handle_exception(server,
1585 _nfs4_proc_lookupfh(server, dirfh, name,
1586 fhandle, fattr),
1587 &exception);
1588 } while (exception.retry);
1589 return err;
1590}
1591
1da177e4
LT		 1592static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1593 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1594{
1595 int status;
1596 struct nfs_server *server = NFS_SERVER(dir);
1597 struct nfs4_lookup_arg args = {
1598 .bitmask = server->attr_bitmask,
1599 .dir_fh = NFS_FH(dir),
1600 .name = name,
1601 };
1602 struct nfs4_lookup_res res = {
1603 .server = server,
1604 .fattr = fattr,
1605 .fh = fhandle,
1606 };
1607 struct rpc_message msg = {
1608 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1609 .rpc_argp = &args,
1610 .rpc_resp = &res,
1611 };
1612
0e574af1 1613 nfs_fattr_init(fattr);
1da177e4
LT		 1614
1615 dprintk("NFS call lookup %s\n", name->name);
1616 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
6b97fd3d
MN		 1617 if (status == -NFS4ERR_MOVED)
1618 status = nfs4_get_referral(dir, name, fattr, fhandle);
1da177e4
LT		 1619 dprintk("NFS reply lookup: %d\n", status);
1620 return status;
1621}
1622
1623static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1624{
1625 struct nfs4_exception exception = { };
1626 int err;
1627 do {
1628 err = nfs4_handle_exception(NFS_SERVER(dir),
1629 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1630 &exception);
1631 } while (exception.retry);
1632 return err;
1633}
1634
1635static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1636{
1637 struct nfs4_accessargs args = {
1638 .fh = NFS_FH(inode),
1639 };
1640 struct nfs4_accessres res = { 0 };
1641 struct rpc_message msg = {
1642 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1643 .rpc_argp = &args,
1644 .rpc_resp = &res,
1645 .rpc_cred = entry->cred,
1646 };
1647 int mode = entry->mask;
1648 int status;
1649
1650 /*
1651 * Determine which access bits we want to ask for...
1652 */
1653 if (mode & MAY_READ)
1654 args.access |= NFS4_ACCESS_READ;
1655 if (S_ISDIR(inode->i_mode)) {
1656 if (mode & MAY_WRITE)
1657 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1658 if (mode & MAY_EXEC)
1659 args.access |= NFS4_ACCESS_LOOKUP;
1660 } else {
1661 if (mode & MAY_WRITE)
1662 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1663 if (mode & MAY_EXEC)
1664 args.access |= NFS4_ACCESS_EXECUTE;
1665 }
1666 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1667 if (!status) {
1668 entry->mask = 0;
1669 if (res.access & NFS4_ACCESS_READ)
1670 entry->mask |= MAY_READ;
1671 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1672 entry->mask |= MAY_WRITE;
1673 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1674 entry->mask |= MAY_EXEC;
1675 }
1676 return status;
1677}
1678
1679static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1680{
1681 struct nfs4_exception exception = { };
1682 int err;
1683 do {
1684 err = nfs4_handle_exception(NFS_SERVER(inode),
1685 _nfs4_proc_access(inode, entry),
1686 &exception);
1687 } while (exception.retry);
1688 return err;
1689}
1690
1691/*
1692 * TODO: For the time being, we don't try to get any attributes
1693 * along with any of the zero-copy operations READ, READDIR,
1694 * READLINK, WRITE.
1695 *
1696 * In the case of the first three, we want to put the GETATTR
1697 * after the read-type operation -- this is because it is hard
1698 * to predict the length of a GETATTR response in v4, and thus
1699 * align the READ data correctly. This means that the GETATTR
1700 * may end up partially falling into the page cache, and we should
1701 * shift it into the 'tail' of the xdr_buf before processing.
1702 * To do this efficiently, we need to know the total length
1703 * of data received, which doesn't seem to be available outside
1704 * of the RPC layer.
1705 *
1706 * In the case of WRITE, we also want to put the GETATTR after
1707 * the operation -- in this case because we want to make sure
1708 * we get the post-operation mtime and size. This means that
1709 * we can't use xdr_encode_pages() as written: we need a variant
1710 * of it which would leave room in the 'tail' iovec.
1711 *
1712 * Both of these changes to the XDR layer would in fact be quite
1713 * minor, but I decided to leave them for a subsequent patch.
1714 */
1715static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1716 unsigned int pgbase, unsigned int pglen)
1717{
1718 struct nfs4_readlink args = {
1719 .fh = NFS_FH(inode),
1720 .pgbase = pgbase,
1721 .pglen = pglen,
1722 .pages = &page,
1723 };
1724 struct rpc_message msg = {
1725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1726 .rpc_argp = &args,
1727 .rpc_resp = NULL,
1728 };
1729
1730 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1731}
1732
1733static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1734 unsigned int pgbase, unsigned int pglen)
1735{
1736 struct nfs4_exception exception = { };
1737 int err;
1738 do {
1739 err = nfs4_handle_exception(NFS_SERVER(inode),
1740 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1741 &exception);
1742 } while (exception.retry);
1743 return err;
1744}
1745
1da177e4
LT		 1746/*
1747 * Got race?
1748 * We will need to arrange for the VFS layer to provide an atomic open.
1749 * Until then, this create/open method is prone to inefficiency and race
1750 * conditions due to the lookup, create, and open VFS calls from sys_open()
1751 * placed on the wire.
1752 *
1753 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1754 * The file will be opened again in the subsequent VFS open call
1755 * (nfs4_proc_file_open).
1756 *
1757 * The open for read will just hang around to be used by any process that
1758 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1759 */
1760
1761static int
1762nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1763 int flags, struct nameidata *nd)
1da177e4 1764{
ad389da7
TM		 1765 struct path path = {
1766 .mnt = nd->mnt,
1767 .dentry = dentry,
1768 };
1da177e4
LT		 1769 struct nfs4_state *state;
1770 struct rpc_cred *cred;
1771 int status = 0;
1772
1f163415 1773 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1da177e4
LT		 1774 if (IS_ERR(cred)) {
1775 status = PTR_ERR(cred);
1776 goto out;
1777 }
ad389da7 1778 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1da177e4
LT		 1779 put_rpccred(cred);
1780 if (IS_ERR(state)) {
1781 status = PTR_ERR(state);
1782 goto out;
1783 }
24ac23ab 1784 d_instantiate(dentry, igrab(state->inode));
1da177e4
LT		 1785 if (flags & O_EXCL) {
1786 struct nfs_fattr fattr;
3e4f6290 1787 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
02a913a7 1788 if (status == 0)
65e4308d 1789 nfs_setattr_update_inode(state->inode, sattr);
02a913a7 1790 }
ad389da7 1791 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
95cf959b 1792 status = nfs4_intent_set_file(nd, dentry, state);
02a913a7
TM		 1793 else
1794 nfs4_close_state(state, flags);
1da177e4
LT		 1795out:
1796 return status;
1797}
1798
1799static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1800{
16e42959 1801 struct nfs_server *server = NFS_SERVER(dir);
1da177e4
LT		 1802 struct nfs4_remove_arg args = {
1803 .fh = NFS_FH(dir),
1804 .name = name,
16e42959
TM		 1805 .bitmask = server->attr_bitmask,
1806 };
1807 struct nfs_fattr dir_attr;
1808 struct nfs4_remove_res res = {
1809 .server = server,
1810 .dir_attr = &dir_attr,
1da177e4 1811 };
1da177e4
LT		 1812 struct rpc_message msg = {
1813 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1814 .rpc_argp = &args,
1815 .rpc_resp = &res,
1816 };
1817 int status;
1818
16e42959
TM		 1819 nfs_fattr_init(res.dir_attr);
1820 status = rpc_call_sync(server->client, &msg, 0);
1821 if (status == 0) {
1822 update_changeattr(dir, &res.cinfo);
1823 nfs_post_op_update_inode(dir, res.dir_attr);
1824 }
1da177e4
LT		 1825 return status;
1826}
1827
1828static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1829{
1830 struct nfs4_exception exception = { };
1831 int err;
1832 do {
1833 err = nfs4_handle_exception(NFS_SERVER(dir),
1834 _nfs4_proc_remove(dir, name),
1835 &exception);
1836 } while (exception.retry);
1837 return err;
1838}
1839
1840struct unlink_desc {
1841 struct nfs4_remove_arg args;
16e42959
TM		 1842 struct nfs4_remove_res res;
1843 struct nfs_fattr dir_attr;
1da177e4
LT		 1844};
1845
1846static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1847 struct qstr *name)
1848{
16e42959 1849 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1da177e4
LT		 1850 struct unlink_desc *up;
1851
5cbded58 1852 up = kmalloc(sizeof(*up), GFP_KERNEL);
1da177e4
LT		 1853 if (!up)
1854 return -ENOMEM;
1855
1856 up->args.fh = NFS_FH(dir->d_inode);
1857 up->args.name = name;
16e42959
TM		 1858 up->args.bitmask = server->attr_bitmask;
1859 up->res.server = server;
1860 up->res.dir_attr = &up->dir_attr;
1da177e4
LT		 1861
1862 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1863 msg->rpc_argp = &up->args;
1864 msg->rpc_resp = &up->res;
1865 return 0;
1866}
1867
1868static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1869{
1870 struct rpc_message *msg = &task->tk_msg;
1871 struct unlink_desc *up;
1872
1873 if (msg->rpc_resp != NULL) {
1874 up = container_of(msg->rpc_resp, struct unlink_desc, res);
16e42959
TM		 1875 update_changeattr(dir->d_inode, &up->res.cinfo);
1876 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1da177e4
LT		 1877 kfree(up);
1878 msg->rpc_resp = NULL;
1879 msg->rpc_argp = NULL;
1880 }
1881 return 0;
1882}
1883
1884static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1885 struct inode *new_dir, struct qstr *new_name)
1886{
6caf2c82 1887 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1888 struct nfs4_rename_arg arg = {
1889 .old_dir = NFS_FH(old_dir),
1890 .new_dir = NFS_FH(new_dir),
1891 .old_name = old_name,
1892 .new_name = new_name,
6caf2c82
TM		 1893 .bitmask = server->attr_bitmask,
1894 };
1895 struct nfs_fattr old_fattr, new_fattr;
1896 struct nfs4_rename_res res = {
1897 .server = server,
1898 .old_fattr = &old_fattr,
1899 .new_fattr = &new_fattr,
1da177e4 1900 };
1da177e4
LT		 1901 struct rpc_message msg = {
1902 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1903 .rpc_argp = &arg,
1904 .rpc_resp = &res,
1905 };
1906 int status;
1907
6caf2c82
TM		 1908 nfs_fattr_init(res.old_fattr);
1909 nfs_fattr_init(res.new_fattr);
1910 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 1911
1912 if (!status) {
1913 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 1914 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 1915 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 1916 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 1917 }
1918 return status;
1919}
1920
1921static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1922 struct inode *new_dir, struct qstr *new_name)
1923{
1924 struct nfs4_exception exception = { };
1925 int err;
1926 do {
1927 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1928 _nfs4_proc_rename(old_dir, old_name,
1929 new_dir, new_name),
1930 &exception);
1931 } while (exception.retry);
1932 return err;
1933}
1934
1935static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1936{
91ba2eee 1937 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1938 struct nfs4_link_arg arg = {
1939 .fh = NFS_FH(inode),
1940 .dir_fh = NFS_FH(dir),
1941 .name = name,
91ba2eee
TM		 1942 .bitmask = server->attr_bitmask,
1943 };
1944 struct nfs_fattr fattr, dir_attr;
1945 struct nfs4_link_res res = {
1946 .server = server,
1947 .fattr = &fattr,
1948 .dir_attr = &dir_attr,
1da177e4 1949 };
1da177e4
LT		 1950 struct rpc_message msg = {
1951 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1952 .rpc_argp = &arg,
91ba2eee 1953 .rpc_resp = &res,
1da177e4
LT		 1954 };
1955 int status;
1956
91ba2eee
TM		 1957 nfs_fattr_init(res.fattr);
1958 nfs_fattr_init(res.dir_attr);
1959 status = rpc_call_sync(server->client, &msg, 0);
1960 if (!status) {
1961 update_changeattr(dir, &res.cinfo);
1962 nfs_post_op_update_inode(dir, res.dir_attr);
73a3d07c 1963 nfs_post_op_update_inode(inode, res.fattr);
91ba2eee 1964 }
1da177e4
LT		 1965
1966 return status;
1967}
1968
1969static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1970{
1971 struct nfs4_exception exception = { };
1972 int err;
1973 do {
1974 err = nfs4_handle_exception(NFS_SERVER(inode),
1975 _nfs4_proc_link(inode, dir, name),
1976 &exception);
1977 } while (exception.retry);
1978 return err;
1979}
1980
4f390c15 1981static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 1982 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 1983{
1984 struct nfs_server *server = NFS_SERVER(dir);
4f390c15
CL		 1985 struct nfs_fh fhandle;
1986 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 1987 struct nfs4_create_arg arg = {
1988 .dir_fh = NFS_FH(dir),
1989 .server = server,
4f390c15 1990 .name = &dentry->d_name,
1da177e4
LT		 1991 .attrs = sattr,
1992 .ftype = NF4LNK,
1993 .bitmask = server->attr_bitmask,
1994 };
1995 struct nfs4_create_res res = {
1996 .server = server,
4f390c15
CL		 1997 .fh = &fhandle,
1998 .fattr = &fattr,
56ae19f3 1999 .dir_fattr = &dir_fattr,
1da177e4
LT		 2000 };
2001 struct rpc_message msg = {
2002 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2003 .rpc_argp = &arg,
2004 .rpc_resp = &res,
2005 };
2006 int status;
2007
94a6d753 2008 if (len > NFS4_MAXPATHLEN)
1da177e4 2009 return -ENAMETOOLONG;
4f390c15 2010
94a6d753
CL		 2011 arg.u.symlink.pages = &page;
2012 arg.u.symlink.len = len;
4f390c15 2013 nfs_fattr_init(&fattr);
56ae19f3 2014 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2015
2016 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
4f390c15 2017 if (!status) {
1da177e4 2018 update_changeattr(dir, &res.dir_cinfo);
4f390c15
CL		 2019 nfs_post_op_update_inode(dir, res.dir_fattr);
2020 status = nfs_instantiate(dentry, &fhandle, &fattr);
2021 }
1da177e4
LT		 2022 return status;
2023}
2024
4f390c15 2025static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
94a6d753 2026 struct page *page, unsigned int len, struct iattr *sattr)
1da177e4
LT		 2027{
2028 struct nfs4_exception exception = { };
2029 int err;
2030 do {
2031 err = nfs4_handle_exception(NFS_SERVER(dir),
94a6d753
CL		 2032 _nfs4_proc_symlink(dir, dentry, page,
2033 len, sattr),
1da177e4
LT		 2034 &exception);
2035 } while (exception.retry);
2036 return err;
2037}
2038
2039static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2040 struct iattr *sattr)
2041{
2042 struct nfs_server *server = NFS_SERVER(dir);
2043 struct nfs_fh fhandle;
56ae19f3 2044 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2045 struct nfs4_create_arg arg = {
2046 .dir_fh = NFS_FH(dir),
2047 .server = server,
2048 .name = &dentry->d_name,
2049 .attrs = sattr,
2050 .ftype = NF4DIR,
2051 .bitmask = server->attr_bitmask,
2052 };
2053 struct nfs4_create_res res = {
2054 .server = server,
2055 .fh = &fhandle,
2056 .fattr = &fattr,
56ae19f3 2057 .dir_fattr = &dir_fattr,
1da177e4
LT		 2058 };
2059 struct rpc_message msg = {
2060 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2061 .rpc_argp = &arg,
2062 .rpc_resp = &res,
2063 };
2064 int status;
2065
0e574af1 2066 nfs_fattr_init(&fattr);
56ae19f3 2067 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2068
2069 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2070 if (!status) {
2071 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2072 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2073 status = nfs_instantiate(dentry, &fhandle, &fattr);
2074 }
2075 return status;
2076}
2077
2078static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2079 struct iattr *sattr)
2080{
2081 struct nfs4_exception exception = { };
2082 int err;
2083 do {
2084 err = nfs4_handle_exception(NFS_SERVER(dir),
2085 _nfs4_proc_mkdir(dir, dentry, sattr),
2086 &exception);
2087 } while (exception.retry);
2088 return err;
2089}
2090
2091static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2092 u64 cookie, struct page *page, unsigned int count, int plus)
2093{
2094 struct inode *dir = dentry->d_inode;
2095 struct nfs4_readdir_arg args = {
2096 .fh = NFS_FH(dir),
2097 .pages = &page,
2098 .pgbase = 0,
2099 .count = count,
2100 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2101 };
2102 struct nfs4_readdir_res res;
2103 struct rpc_message msg = {
2104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2105 .rpc_argp = &args,
2106 .rpc_resp = &res,
2107 .rpc_cred = cred,
2108 };
2109 int status;
2110
eadf4598
TM		 2111 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2112 dentry->d_parent->d_name.name,
2113 dentry->d_name.name,
2114 (unsigned long long)cookie);
1da177e4
LT		 2115 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2116 res.pgbase = args.pgbase;
2117 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2118 if (status == 0)
2119 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
eadf4598 2120 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 2121 return status;
2122}
2123
2124static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2125 u64 cookie, struct page *page, unsigned int count, int plus)
2126{
2127 struct nfs4_exception exception = { };
2128 int err;
2129 do {
2130 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2131 _nfs4_proc_readdir(dentry, cred, cookie,
2132 page, count, plus),
2133 &exception);
2134 } while (exception.retry);
2135 return err;
2136}
2137
2138static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2139 struct iattr *sattr, dev_t rdev)
2140{
2141 struct nfs_server *server = NFS_SERVER(dir);
2142 struct nfs_fh fh;
56ae19f3 2143 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 2144 struct nfs4_create_arg arg = {
2145 .dir_fh = NFS_FH(dir),
2146 .server = server,
2147 .name = &dentry->d_name,
2148 .attrs = sattr,
2149 .bitmask = server->attr_bitmask,
2150 };
2151 struct nfs4_create_res res = {
2152 .server = server,
2153 .fh = &fh,
2154 .fattr = &fattr,
56ae19f3 2155 .dir_fattr = &dir_fattr,
1da177e4
LT		 2156 };
2157 struct rpc_message msg = {
2158 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2159 .rpc_argp = &arg,
2160 .rpc_resp = &res,
2161 };
2162 int status;
2163 int mode = sattr->ia_mode;
2164
0e574af1 2165 nfs_fattr_init(&fattr);
56ae19f3 2166 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 2167
2168 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2169 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2170 if (S_ISFIFO(mode))
2171 arg.ftype = NF4FIFO;
2172 else if (S_ISBLK(mode)) {
2173 arg.ftype = NF4BLK;
2174 arg.u.device.specdata1 = MAJOR(rdev);
2175 arg.u.device.specdata2 = MINOR(rdev);
2176 }
2177 else if (S_ISCHR(mode)) {
2178 arg.ftype = NF4CHR;
2179 arg.u.device.specdata1 = MAJOR(rdev);
2180 arg.u.device.specdata2 = MINOR(rdev);
2181 }
2182 else
2183 arg.ftype = NF4SOCK;
2184
2185 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2186 if (status == 0) {
2187 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2188 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2189 status = nfs_instantiate(dentry, &fh, &fattr);
2190 }
2191 return status;
2192}
2193
2194static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2195 struct iattr *sattr, dev_t rdev)
2196{
2197 struct nfs4_exception exception = { };
2198 int err;
2199 do {
2200 err = nfs4_handle_exception(NFS_SERVER(dir),
2201 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2202 &exception);
2203 } while (exception.retry);
2204 return err;
2205}
2206
2207static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2208 struct nfs_fsstat *fsstat)
2209{
2210 struct nfs4_statfs_arg args = {
2211 .fh = fhandle,
2212 .bitmask = server->attr_bitmask,
2213 };
2214 struct rpc_message msg = {
2215 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2216 .rpc_argp = &args,
2217 .rpc_resp = fsstat,
2218 };
2219
0e574af1 2220 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2221 return rpc_call_sync(server->client, &msg, 0);
2222}
2223
2224static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2225{
2226 struct nfs4_exception exception = { };
2227 int err;
2228 do {
2229 err = nfs4_handle_exception(server,
2230 _nfs4_proc_statfs(server, fhandle, fsstat),
2231 &exception);
2232 } while (exception.retry);
2233 return err;
2234}
2235
2236static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2237 struct nfs_fsinfo *fsinfo)
2238{
2239 struct nfs4_fsinfo_arg args = {
2240 .fh = fhandle,
2241 .bitmask = server->attr_bitmask,
2242 };
2243 struct rpc_message msg = {
2244 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2245 .rpc_argp = &args,
2246 .rpc_resp = fsinfo,
2247 };
2248
2249 return rpc_call_sync(server->client, &msg, 0);
2250}
2251
2252static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2253{
2254 struct nfs4_exception exception = { };
2255 int err;
2256
2257 do {
2258 err = nfs4_handle_exception(server,
2259 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2260 &exception);
2261 } while (exception.retry);
2262 return err;
2263}
2264
2265static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2266{
0e574af1 2267 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2268 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2269}
2270
2271static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2272 struct nfs_pathconf *pathconf)
2273{
2274 struct nfs4_pathconf_arg args = {
2275 .fh = fhandle,
2276 .bitmask = server->attr_bitmask,
2277 };
2278 struct rpc_message msg = {
2279 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2280 .rpc_argp = &args,
2281 .rpc_resp = pathconf,
2282 };
2283
2284 /* None of the pathconf attributes are mandatory to implement */
2285 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2286 memset(pathconf, 0, sizeof(*pathconf));
2287 return 0;
2288 }
2289
0e574af1 2290 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2291 return rpc_call_sync(server->client, &msg, 0);
2292}
2293
2294static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2295 struct nfs_pathconf *pathconf)
2296{
2297 struct nfs4_exception exception = { };
2298 int err;
2299
2300 do {
2301 err = nfs4_handle_exception(server,
2302 _nfs4_proc_pathconf(server, fhandle, pathconf),
2303 &exception);
2304 } while (exception.retry);
2305 return err;
2306}
2307
ec06c096 2308static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
1da177e4 2309{
ec06c096 2310 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2311
ec06c096 2312 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1da177e4 2313 rpc_restart_call(task);
ec06c096 2314 return -EAGAIN;
1da177e4
LT		 2315 }
2316 if (task->tk_status > 0)
ec06c096
TM		 2317 renew_lease(server, data->timestamp);
2318 return 0;
1da177e4
LT		 2319}
2320
ec06c096 2321static void nfs4_proc_read_setup(struct nfs_read_data *data)
1da177e4 2322{
1da177e4
LT		 2323 struct rpc_message msg = {
2324 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2325 .rpc_argp = &data->args,
2326 .rpc_resp = &data->res,
2327 .rpc_cred = data->cred,
2328 };
1da177e4
LT		 2329
2330 data->timestamp = jiffies;
2331
ec06c096 2332 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2333}
2334
788e7a89 2335static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2336{
1da177e4
LT		 2337 struct inode *inode = data->inode;
2338
2339 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2340 rpc_restart_call(task);
788e7a89 2341 return -EAGAIN;
1da177e4 2342 }
4f9838c7 2343 if (task->tk_status >= 0) {
1da177e4 2344 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2345 nfs_post_op_update_inode(inode, data->res.fattr);
2346 }
788e7a89 2347 return 0;
1da177e4
LT		 2348}
2349
788e7a89 2350static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1da177e4 2351{
1da177e4
LT		 2352 struct rpc_message msg = {
2353 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2354 .rpc_argp = &data->args,
2355 .rpc_resp = &data->res,
2356 .rpc_cred = data->cred,
2357 };
2358 struct inode *inode = data->inode;
4f9838c7 2359 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2360 int stable;
1da177e4
LT		 2361
2362 if (how & FLUSH_STABLE) {
2363 if (!NFS_I(inode)->ncommit)
2364 stable = NFS_FILE_SYNC;
2365 else
2366 stable = NFS_DATA_SYNC;
2367 } else
2368 stable = NFS_UNSTABLE;
2369 data->args.stable = stable;
4f9838c7
TM		 2370 data->args.bitmask = server->attr_bitmask;
2371 data->res.server = server;
1da177e4
LT		 2372
2373 data->timestamp = jiffies;
2374
1da177e4 2375 /* Finalize the task. */
788e7a89 2376 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2377}
2378
788e7a89 2379static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 2380{
1da177e4
LT		 2381 struct inode *inode = data->inode;
2382
2383 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2384 rpc_restart_call(task);
788e7a89 2385 return -EAGAIN;
1da177e4 2386 }
4f9838c7
TM		 2387 if (task->tk_status >= 0)
2388 nfs_post_op_update_inode(inode, data->res.fattr);
788e7a89 2389 return 0;
1da177e4
LT		 2390}
2391
788e7a89 2392static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1da177e4 2393{
1da177e4
LT		 2394 struct rpc_message msg = {
2395 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2396 .rpc_argp = &data->args,
2397 .rpc_resp = &data->res,
2398 .rpc_cred = data->cred,
2399 };
788e7a89 2400 struct nfs_server *server = NFS_SERVER(data->inode);
1da177e4 2401
4f9838c7
TM		 2402 data->args.bitmask = server->attr_bitmask;
2403 data->res.server = server;
2404
788e7a89 2405 rpc_call_setup(&data->task, &msg, 0);
1da177e4
LT		 2406}
2407
2408/*
2409 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2410 * standalone procedure for queueing an asynchronous RENEW.
2411 */
963d8fe5 2412static void nfs4_renew_done(struct rpc_task *task, void *data)
1da177e4 2413{
adfa6f98 2414 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
963d8fe5 2415 unsigned long timestamp = (unsigned long)data;
1da177e4
LT		 2416
2417 if (task->tk_status < 0) {
2418 switch (task->tk_status) {
2419 case -NFS4ERR_STALE_CLIENTID:
2420 case -NFS4ERR_EXPIRED:
2421 case -NFS4ERR_CB_PATH_DOWN:
2422 nfs4_schedule_state_recovery(clp);
2423 }
2424 return;
2425 }
2426 spin_lock(&clp->cl_lock);
2427 if (time_before(clp->cl_last_renewal,timestamp))
2428 clp->cl_last_renewal = timestamp;
2429 spin_unlock(&clp->cl_lock);
2430}
2431
963d8fe5
TM		 2432static const struct rpc_call_ops nfs4_renew_ops = {
2433 .rpc_call_done = nfs4_renew_done,
2434};
2435
adfa6f98 2436int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2437{
2438 struct rpc_message msg = {
2439 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2440 .rpc_argp = clp,
b4454fe1 2441 .rpc_cred = cred,
1da177e4
LT		 2442 };
2443
2444 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
963d8fe5 2445 &nfs4_renew_ops, (void *)jiffies);
1da177e4
LT		 2446}
2447
adfa6f98 2448int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2449{
2450 struct rpc_message msg = {
2451 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2452 .rpc_argp = clp,
b4454fe1 2453 .rpc_cred = cred,
1da177e4
LT		 2454 };
2455 unsigned long now = jiffies;
2456 int status;
2457
2458 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2459 if (status < 0)
2460 return status;
2461 spin_lock(&clp->cl_lock);
2462 if (time_before(clp->cl_last_renewal,now))
2463 clp->cl_last_renewal = now;
2464 spin_unlock(&clp->cl_lock);
2465 return 0;
2466}
2467
aa1870af
BF		 2468static inline int nfs4_server_supports_acls(struct nfs_server *server)
2469{
2470 return (server->caps & NFS_CAP_ACLS)
2471 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2472 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2473}
2474
2475/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2476 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2477 * the stack.
2478 */
2479#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2480
2481static void buf_to_pages(const void *buf, size_t buflen,
2482 struct page **pages, unsigned int *pgbase)
2483{
2484 const void *p = buf;
2485
2486 *pgbase = offset_in_page(buf);
2487 p -= *pgbase;
2488 while (p < buf + buflen) {
2489 *(pages++) = virt_to_page(p);
2490 p += PAGE_CACHE_SIZE;
2491 }
2492}
2493
e50a1c2e
BF		 2494struct nfs4_cached_acl {
2495 int cached;
2496 size_t len;
3e9d4154 2497 char data[0];
e50a1c2e
BF		 2498};
2499
2500static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2501{
2502 struct nfs_inode *nfsi = NFS_I(inode);
2503
2504 spin_lock(&inode->i_lock);
2505 kfree(nfsi->nfs4_acl);
2506 nfsi->nfs4_acl = acl;
2507 spin_unlock(&inode->i_lock);
2508}
2509
2510static void nfs4_zap_acl_attr(struct inode *inode)
2511{
2512 nfs4_set_cached_acl(inode, NULL);
2513}
2514
2515static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2516{
2517 struct nfs_inode *nfsi = NFS_I(inode);
2518 struct nfs4_cached_acl *acl;
2519 int ret = -ENOENT;
2520
2521 spin_lock(&inode->i_lock);
2522 acl = nfsi->nfs4_acl;
2523 if (acl == NULL)
2524 goto out;
2525 if (buf == NULL) /* user is just asking for length */
2526 goto out_len;
2527 if (acl->cached == 0)
2528 goto out;
2529 ret = -ERANGE; /* see getxattr(2) man page */
2530 if (acl->len > buflen)
2531 goto out;
2532 memcpy(buf, acl->data, acl->len);
2533out_len:
2534 ret = acl->len;
2535out:
2536 spin_unlock(&inode->i_lock);
2537 return ret;
2538}
2539
2540static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2541{
2542 struct nfs4_cached_acl *acl;
2543
2544 if (buf && acl_len <= PAGE_SIZE) {
2545 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2546 if (acl == NULL)
2547 goto out;
2548 acl->cached = 1;
2549 memcpy(acl->data, buf, acl_len);
2550 } else {
2551 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2552 if (acl == NULL)
2553 goto out;
2554 acl->cached = 0;
2555 }
2556 acl->len = acl_len;
2557out:
2558 nfs4_set_cached_acl(inode, acl);
2559}
2560
16b4289c 2561static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2562{
aa1870af
BF		 2563 struct page *pages[NFS4ACL_MAXPAGES];
2564 struct nfs_getaclargs args = {
2565 .fh = NFS_FH(inode),
2566 .acl_pages = pages,
2567 .acl_len = buflen,
2568 };
2569 size_t resp_len = buflen;
e50a1c2e 2570 void *resp_buf;
aa1870af
BF		 2571 struct rpc_message msg = {
2572 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2573 .rpc_argp = &args,
2574 .rpc_resp = &resp_len,
2575 };
e50a1c2e 2576 struct page *localpage = NULL;
aa1870af
BF		 2577 int ret;
2578
e50a1c2e
BF		 2579 if (buflen < PAGE_SIZE) {
2580 /* As long as we're doing a round trip to the server anyway,
2581 * let's be prepared for a page of acl data. */
2582 localpage = alloc_page(GFP_KERNEL);
2583 resp_buf = page_address(localpage);
2584 if (localpage == NULL)
2585 return -ENOMEM;
2586 args.acl_pages[0] = localpage;
2587 args.acl_pgbase = 0;
1d95db8e 2588 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2589 } else {
2590 resp_buf = buf;
2591 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2592 }
aa1870af 2593 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2594 if (ret)
2595 goto out_free;
2596 if (resp_len > args.acl_len)
2597 nfs4_write_cached_acl(inode, NULL, resp_len);
2598 else
2599 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2600 if (buf) {
2601 ret = -ERANGE;
2602 if (resp_len > buflen)
2603 goto out_free;
2604 if (localpage)
2605 memcpy(buf, resp_buf, resp_len);
2606 }
2607 ret = resp_len;
2608out_free:
2609 if (localpage)
2610 __free_page(localpage);
aa1870af
BF		 2611 return ret;
2612}
2613
16b4289c
TM		 2614static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2615{
2616 struct nfs4_exception exception = { };
2617 ssize_t ret;
2618 do {
2619 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2620 if (ret >= 0)
2621 break;
2622 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2623 } while (exception.retry);
2624 return ret;
2625}
2626
e50a1c2e
BF		 2627static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2628{
2629 struct nfs_server *server = NFS_SERVER(inode);
2630 int ret;
2631
2632 if (!nfs4_server_supports_acls(server))
2633 return -EOPNOTSUPP;
2634 ret = nfs_revalidate_inode(server, inode);
2635 if (ret < 0)
2636 return ret;
2637 ret = nfs4_read_cached_acl(inode, buf, buflen);
2638 if (ret != -ENOENT)
2639 return ret;
2640 return nfs4_get_acl_uncached(inode, buf, buflen);
2641}
2642
16b4289c 2643static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4b580ee3
BF		 2644{
2645 struct nfs_server *server = NFS_SERVER(inode);
2646 struct page *pages[NFS4ACL_MAXPAGES];
2647 struct nfs_setaclargs arg = {
2648 .fh = NFS_FH(inode),
2649 .acl_pages = pages,
2650 .acl_len = buflen,
2651 };
2652 struct rpc_message msg = {
2653 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2654 .rpc_argp = &arg,
2655 .rpc_resp = NULL,
2656 };
2657 int ret;
2658
2659 if (!nfs4_server_supports_acls(server))
2660 return -EOPNOTSUPP;
642ac549 2661 nfs_inode_return_delegation(inode);
4b580ee3 2662 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
1f163415 2663 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
08efa202 2664 nfs_zap_caches(inode);
4b580ee3
BF		 2665 return ret;
2666}
2667
16b4289c
TM		 2668static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2669{
2670 struct nfs4_exception exception = { };
2671 int err;
2672 do {
2673 err = nfs4_handle_exception(NFS_SERVER(inode),
2674 __nfs4_proc_set_acl(inode, buf, buflen),
2675 &exception);
2676 } while (exception.retry);
2677 return err;
2678}
2679
1da177e4 2680static int
faf5f49c 2681nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4 2682{
7539bbab 2683 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2684
2685 if (!clp || task->tk_status >= 0)
2686 return 0;
2687 switch(task->tk_status) {
2688 case -NFS4ERR_STALE_CLIENTID:
2689 case -NFS4ERR_STALE_STATEID:
2690 case -NFS4ERR_EXPIRED:
2691 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2692 nfs4_schedule_state_recovery(clp);
433fbe4c 2693 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
1da177e4
LT		 2694 rpc_wake_up_task(task);
2695 task->tk_status = 0;
2696 return -EAGAIN;
1da177e4 2697 case -NFS4ERR_DELAY:
006ea73e
CL		 2698 nfs_inc_server_stats((struct nfs_server *) server,
2699 NFSIOS_DELAY);
2700 case -NFS4ERR_GRACE:
1da177e4
LT		 2701 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2702 task->tk_status = 0;
2703 return -EAGAIN;
2704 case -NFS4ERR_OLD_STATEID:
2705 task->tk_status = 0;
2706 return -EAGAIN;
2707 }
2708 task->tk_status = nfs4_map_errors(task->tk_status);
2709 return 0;
2710}
2711
433fbe4c
TM		 2712static int nfs4_wait_bit_interruptible(void *word)
2713{
2714 if (signal_pending(current))
2715 return -ERESTARTSYS;
2716 schedule();
2717 return 0;
2718}
2719
adfa6f98 2720static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
1da177e4 2721{
1da177e4 2722 sigset_t oldset;
433fbe4c 2723 int res;
1da177e4
LT		 2724
2725 might_sleep();
2726
e148582e
TM		 2727 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2728
1da177e4 2729 rpc_clnt_sigmask(clnt, &oldset);
433fbe4c
TM		 2730 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2731 nfs4_wait_bit_interruptible,
2732 TASK_INTERRUPTIBLE);
1da177e4 2733 rpc_clnt_sigunmask(clnt, &oldset);
e148582e
TM		 2734
2735 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
1da177e4
LT		 2736 return res;
2737}
2738
2739static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2740{
2741 sigset_t oldset;
2742 int res = 0;
2743
2744 might_sleep();
2745
2746 if (*timeout <= 0)
2747 *timeout = NFS4_POLL_RETRY_MIN;
2748 if (*timeout > NFS4_POLL_RETRY_MAX)
2749 *timeout = NFS4_POLL_RETRY_MAX;
2750 rpc_clnt_sigmask(clnt, &oldset);
2751 if (clnt->cl_intr) {
041e0e3b 2752 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2753 if (signalled())
2754 res = -ERESTARTSYS;
041e0e3b
NA		 2755 } else
2756 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2757 rpc_clnt_sigunmask(clnt, &oldset);
2758 *timeout <<= 1;
2759 return res;
2760}
2761
2762/* This is the error handling routine for processes that are allowed
2763 * to sleep.
2764 */
10afec90 2765static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4 2766{
7539bbab 2767 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 2768 int ret = errorcode;
2769
2770 exception->retry = 0;
2771 switch(errorcode) {
2772 case 0:
2773 return 0;
2774 case -NFS4ERR_STALE_CLIENTID:
2775 case -NFS4ERR_STALE_STATEID:
2776 case -NFS4ERR_EXPIRED:
433fbe4c 2777 nfs4_schedule_state_recovery(clp);
1da177e4
LT		 2778 ret = nfs4_wait_clnt_recover(server->client, clp);
2779 if (ret == 0)
2780 exception->retry = 1;
2781 break;
c514983d 2782 case -NFS4ERR_FILE_OPEN:
1da177e4
LT		 2783 case -NFS4ERR_GRACE:
2784 case -NFS4ERR_DELAY:
2785 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2786 if (ret != 0)
2787 break;
1da177e4 2788 case -NFS4ERR_OLD_STATEID:
2c56617d 2789 exception->retry = 1;
1da177e4
LT		 2790 }
2791 /* We failed to handle the error */
2792 return nfs4_map_errors(ret);
2793}
2794
adfa6f98 2795int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
1da177e4
LT		 2796{
2797 nfs4_verifier sc_verifier;
2798 struct nfs4_setclientid setclientid = {
2799 .sc_verifier = &sc_verifier,
2800 .sc_prog = program,
2801 };
2802 struct rpc_message msg = {
2803 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2804 .rpc_argp = &setclientid,
2805 .rpc_resp = clp,
286d7d6a 2806 .rpc_cred = cred,
1da177e4 2807 };
bc4785cd 2808 __be32 *p;
1da177e4
LT		 2809 int loop = 0;
2810 int status;
2811
bc4785cd 2812 p = (__be32*)sc_verifier.data;
1da177e4
LT		 2813 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2814 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2815
2816 for(;;) {
2817 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2818 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
24c8dbbb 2819 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
286d7d6a 2820 cred->cr_ops->cr_name,
1da177e4
LT		 2821 clp->cl_id_uniquifier);
2822 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2823 sizeof(setclientid.sc_netid), "tcp");
2824 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2825 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2826 clp->cl_ipaddr, port >> 8, port & 255);
2827
2828 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2829 if (status != -NFS4ERR_CLID_INUSE)
2830 break;
2831 if (signalled())
2832 break;
2833 if (loop++ & 1)
2834 ssleep(clp->cl_lease_time + 1);
2835 else
2836 if (++clp->cl_id_uniquifier == 0)
2837 break;
2838 }
2839 return status;
2840}
2841
adfa6f98 2842static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
1da177e4
LT		 2843{
2844 struct nfs_fsinfo fsinfo;
2845 struct rpc_message msg = {
2846 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2847 .rpc_argp = clp,
2848 .rpc_resp = &fsinfo,
286d7d6a 2849 .rpc_cred = cred,
1da177e4
LT		 2850 };
2851 unsigned long now;
2852 int status;
2853
2854 now = jiffies;
2855 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2856 if (status == 0) {
2857 spin_lock(&clp->cl_lock);
2858 clp->cl_lease_time = fsinfo.lease_time * HZ;
2859 clp->cl_last_renewal = now;
58d9714a 2860 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1da177e4
LT		 2861 spin_unlock(&clp->cl_lock);
2862 }
2863 return status;
2864}
2865
adfa6f98 2866int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
51581f3b
TM		 2867{
2868 long timeout;
2869 int err;
2870 do {
2871 err = _nfs4_proc_setclientid_confirm(clp, cred);
2872 switch (err) {
2873 case 0:
2874 return err;
2875 case -NFS4ERR_RESOURCE:
2876 /* The IBM lawyers misread another document! */
2877 case -NFS4ERR_DELAY:
2878 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2879 }
2880 } while (err == 0);
2881 return err;
2882}
2883
fe650407
TM		 2884struct nfs4_delegreturndata {
2885 struct nfs4_delegreturnargs args;
fa178f29 2886 struct nfs4_delegreturnres res;
fe650407
TM		 2887 struct nfs_fh fh;
2888 nfs4_stateid stateid;
2889 struct rpc_cred *cred;
26e976a8 2890 unsigned long timestamp;
fa178f29 2891 struct nfs_fattr fattr;
fe650407
TM		 2892 int rpc_status;
2893};
2894
2895static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
1da177e4 2896{
fe650407 2897 struct nfs4_delegreturndata *data = calldata;
1da177e4
LT		 2898 struct rpc_message msg = {
2899 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
fe650407 2900 .rpc_argp = &data->args,
fa178f29 2901 .rpc_resp = &data->res,
fe650407 2902 .rpc_cred = data->cred,
1da177e4 2903 };
fa178f29 2904 nfs_fattr_init(data->res.fattr);
fe650407
TM		 2905 rpc_call_setup(task, &msg, 0);
2906}
1da177e4 2907
fe650407
TM		 2908static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2909{
2910 struct nfs4_delegreturndata *data = calldata;
2911 data->rpc_status = task->tk_status;
26e976a8 2912 if (data->rpc_status == 0)
fa178f29 2913 renew_lease(data->res.server, data->timestamp);
fe650407
TM		 2914}
2915
2916static void nfs4_delegreturn_release(void *calldata)
2917{
2918 struct nfs4_delegreturndata *data = calldata;
2919
2920 put_rpccred(data->cred);
2921 kfree(calldata);
2922}
2923
c8d149f3 2924static const struct rpc_call_ops nfs4_delegreturn_ops = {
fe650407
TM		 2925 .rpc_call_prepare = nfs4_delegreturn_prepare,
2926 .rpc_call_done = nfs4_delegreturn_done,
2927 .rpc_release = nfs4_delegreturn_release,
2928};
2929
2930static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2931{
2932 struct nfs4_delegreturndata *data;
fa178f29 2933 struct nfs_server *server = NFS_SERVER(inode);
fe650407
TM		 2934 struct rpc_task *task;
2935 int status;
2936
2937 data = kmalloc(sizeof(*data), GFP_KERNEL);
2938 if (data == NULL)
2939 return -ENOMEM;
2940 data->args.fhandle = &data->fh;
2941 data->args.stateid = &data->stateid;
fa178f29 2942 data->args.bitmask = server->attr_bitmask;
fe650407
TM		 2943 nfs_copy_fh(&data->fh, NFS_FH(inode));
2944 memcpy(&data->stateid, stateid, sizeof(data->stateid));
fa178f29
TM		 2945 data->res.fattr = &data->fattr;
2946 data->res.server = server;
fe650407 2947 data->cred = get_rpccred(cred);
26e976a8 2948 data->timestamp = jiffies;
fe650407
TM		 2949 data->rpc_status = 0;
2950
2951 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
7a1218a2 2952 if (IS_ERR(task))
fe650407 2953 return PTR_ERR(task);
fe650407 2954 status = nfs4_wait_for_completion_rpc_task(task);
fa178f29 2955 if (status == 0) {
fe650407 2956 status = data->rpc_status;
fa178f29
TM		 2957 if (status == 0)
2958 nfs_post_op_update_inode(inode, &data->fattr);
2959 }
e6b3c4db 2960 rpc_put_task(task);
fe650407 2961 return status;
1da177e4
LT		 2962}
2963
2964int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2965{
2966 struct nfs_server *server = NFS_SERVER(inode);
2967 struct nfs4_exception exception = { };
2968 int err;
2969 do {
2970 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2971 switch (err) {
2972 case -NFS4ERR_STALE_STATEID:
2973 case -NFS4ERR_EXPIRED:
1da177e4
LT		 2974 case 0:
2975 return 0;
2976 }
2977 err = nfs4_handle_exception(server, err, &exception);
2978 } while (exception.retry);
2979 return err;
2980}
2981
2982#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2983#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2984
2985/*
2986 * sleep, with exponential backoff, and retry the LOCK operation.
2987 */
2988static unsigned long
2989nfs4_set_lock_task_retry(unsigned long timeout)
2990{
041e0e3b 2991 schedule_timeout_interruptible(timeout);
1da177e4
LT		 2992 timeout <<= 1;
2993 if (timeout > NFS4_LOCK_MAXTIMEOUT)
2994 return NFS4_LOCK_MAXTIMEOUT;
2995 return timeout;
2996}
2997
1da177e4
LT		 2998static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2999{
3000 struct inode *inode = state->inode;
3001 struct nfs_server *server = NFS_SERVER(inode);
7539bbab 3002 struct nfs_client *clp = server->nfs_client;
911d1aaf 3003 struct nfs_lockt_args arg = {
1da177e4 3004 .fh = NFS_FH(inode),
911d1aaf 3005 .fl = request,
1da177e4 3006 };
911d1aaf
TM		 3007 struct nfs_lockt_res res = {
3008 .denied = request,
1da177e4
LT		 3009 };
3010 struct rpc_message msg = {
3011 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3012 .rpc_argp = &arg,
3013 .rpc_resp = &res,
3014 .rpc_cred = state->owner->so_cred,
3015 };
1da177e4
LT		 3016 struct nfs4_lock_state *lsp;
3017 int status;
3018
3019 down_read(&clp->cl_sem);
911d1aaf 3020 arg.lock_owner.clientid = clp->cl_clientid;
8d0a8a9d
TM		 3021 status = nfs4_set_lock_state(state, request);
3022 if (status != 0)
3023 goto out;
3024 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3025 arg.lock_owner.id = lsp->ls_id;
1da177e4 3026 status = rpc_call_sync(server->client, &msg, 0);
911d1aaf
TM		 3027 switch (status) {
3028 case 0:
3029 request->fl_type = F_UNLCK;
3030 break;
3031 case -NFS4ERR_DENIED:
3032 status = 0;
1da177e4 3033 }
70cc6487 3034 request->fl_ops->fl_release_private(request);
8d0a8a9d 3035out:
1da177e4
LT		 3036 up_read(&clp->cl_sem);
3037 return status;
3038}
3039
3040static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3041{
3042 struct nfs4_exception exception = { };
3043 int err;
3044
3045 do {
3046 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3047 _nfs4_proc_getlk(state, cmd, request),
3048 &exception);
3049 } while (exception.retry);
3050 return err;
3051}
3052
3053static int do_vfs_lock(struct file *file, struct file_lock *fl)
3054{
3055 int res = 0;
3056 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3057 case FL_POSIX:
3058 res = posix_lock_file_wait(file, fl);
3059 break;
3060 case FL_FLOCK:
3061 res = flock_lock_file_wait(file, fl);
3062 break;
3063 default:
3064 BUG();
3065 }
1da177e4
LT		 3066 return res;
3067}
3068
faf5f49c 3069struct nfs4_unlockdata {
911d1aaf
TM		 3070 struct nfs_locku_args arg;
3071 struct nfs_locku_res res;
faf5f49c
TM		 3072 struct nfs4_lock_state *lsp;
3073 struct nfs_open_context *ctx;
911d1aaf
TM		 3074 struct file_lock fl;
3075 const struct nfs_server *server;
26e976a8 3076 unsigned long timestamp;
faf5f49c
TM		 3077};
3078
911d1aaf
TM		 3079static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3080 struct nfs_open_context *ctx,
3081 struct nfs4_lock_state *lsp,
3082 struct nfs_seqid *seqid)
3083{
3084 struct nfs4_unlockdata *p;
3085 struct inode *inode = lsp->ls_state->inode;
3086
3087 p = kmalloc(sizeof(*p), GFP_KERNEL);
3088 if (p == NULL)
3089 return NULL;
3090 p->arg.fh = NFS_FH(inode);
3091 p->arg.fl = &p->fl;
3092 p->arg.seqid = seqid;
3093 p->arg.stateid = &lsp->ls_stateid;
3094 p->lsp = lsp;
3095 atomic_inc(&lsp->ls_count);
3096 /* Ensure we don't close file until we're done freeing locks! */
3097 p->ctx = get_nfs_open_context(ctx);
3098 memcpy(&p->fl, fl, sizeof(p->fl));
3099 p->server = NFS_SERVER(inode);
3100 return p;
3101}
3102
06f814a3 3103static void nfs4_locku_release_calldata(void *data)
faf5f49c 3104{
963d8fe5 3105 struct nfs4_unlockdata *calldata = data;
911d1aaf 3106 nfs_free_seqid(calldata->arg.seqid);
06f814a3
TM		 3107 nfs4_put_lock_state(calldata->lsp);
3108 put_nfs_open_context(calldata->ctx);
3109 kfree(calldata);
faf5f49c
TM		 3110}
3111
963d8fe5 3112static void nfs4_locku_done(struct rpc_task *task, void *data)
faf5f49c 3113{
963d8fe5 3114 struct nfs4_unlockdata *calldata = data;
faf5f49c 3115
06f814a3
TM		 3116 if (RPC_ASSASSINATED(task))
3117 return;
911d1aaf 3118 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
faf5f49c
TM		 3119 switch (task->tk_status) {
3120 case 0:
3121 memcpy(calldata->lsp->ls_stateid.data,
911d1aaf 3122 calldata->res.stateid.data,
faf5f49c 3123 sizeof(calldata->lsp->ls_stateid.data));
26e976a8 3124 renew_lease(calldata->server, calldata->timestamp);
faf5f49c
TM		 3125 break;
3126 case -NFS4ERR_STALE_STATEID:
3127 case -NFS4ERR_EXPIRED:
faf5f49c
TM		 3128 break;
3129 default:
a6a352e9 3130 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
faf5f49c 3131 rpc_restart_call(task);
faf5f49c 3132 }
faf5f49c
TM		 3133}
3134
4ce70ada 3135static void nfs4_locku_prepare(struct rpc_task *task, void *data)
faf5f49c 3136{
4ce70ada 3137 struct nfs4_unlockdata *calldata = data;
1da177e4
LT		 3138 struct rpc_message msg = {
3139 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 3140 .rpc_argp = &calldata->arg,
3141 .rpc_resp = &calldata->res,
3142 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 3143 };
faf5f49c 3144
911d1aaf 3145 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
faf5f49c
TM		 3146 return;
3147 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
963d8fe5
TM		 3148 /* Note: exit _without_ running nfs4_locku_done */
3149 task->tk_action = NULL;
faf5f49c
TM		 3150 return;
3151 }
26e976a8 3152 calldata->timestamp = jiffies;
faf5f49c
TM		 3153 rpc_call_setup(task, &msg, 0);
3154}
3155
963d8fe5 3156static const struct rpc_call_ops nfs4_locku_ops = {
4ce70ada 3157 .rpc_call_prepare = nfs4_locku_prepare,
963d8fe5 3158 .rpc_call_done = nfs4_locku_done,
06f814a3 3159 .rpc_release = nfs4_locku_release_calldata,
963d8fe5
TM		 3160};
3161
a5d16a4d
TM		 3162static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3163 struct nfs_open_context *ctx,
3164 struct nfs4_lock_state *lsp,
3165 struct nfs_seqid *seqid)
3166{
3167 struct nfs4_unlockdata *data;
a5d16a4d
TM		 3168
3169 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3170 if (data == NULL) {
3171 nfs_free_seqid(seqid);
3172 return ERR_PTR(-ENOMEM);
3173 }
3174
7a1218a2 3175 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
a5d16a4d
TM		 3176}
3177
faf5f49c
TM		 3178static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3179{
911d1aaf 3180 struct nfs_seqid *seqid;
1da177e4 3181 struct nfs4_lock_state *lsp;
06f814a3
TM		 3182 struct rpc_task *task;
3183 int status = 0;
faf5f49c 3184
8d0a8a9d 3185 status = nfs4_set_lock_state(state, request);
9b073574
TM		 3186 /* Unlock _before_ we do the RPC call */
3187 request->fl_flags |= FL_EXISTS;
3188 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3189 goto out;
8d0a8a9d 3190 if (status != 0)
9b073574
TM		 3191 goto out;
3192 /* Is this a delegated lock? */
3193 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3194 goto out;
8d0a8a9d 3195 lsp = request->fl_u.nfs4_fl.owner;
911d1aaf 3196 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
9b073574 3197 status = -ENOMEM;
911d1aaf 3198 if (seqid == NULL)
9b073574 3199 goto out;
a5d16a4d
TM		 3200 task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3201 status = PTR_ERR(task);
3202 if (IS_ERR(task))
9b073574 3203 goto out;
a5d16a4d 3204 status = nfs4_wait_for_completion_rpc_task(task);
e6b3c4db 3205 rpc_put_task(task);
9b073574 3206out:
1da177e4
LT		 3207 return status;
3208}
3209
a5d16a4d
TM		 3210struct nfs4_lockdata {
3211 struct nfs_lock_args arg;
3212 struct nfs_lock_res res;
3213 struct nfs4_lock_state *lsp;
3214 struct nfs_open_context *ctx;
3215 struct file_lock fl;
26e976a8 3216 unsigned long timestamp;
a5d16a4d
TM		 3217 int rpc_status;
3218 int cancelled;
3219};
3220
3221static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3222 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
1da177e4 3223{
a5d16a4d
TM		 3224 struct nfs4_lockdata *p;
3225 struct inode *inode = lsp->ls_state->inode;
1da177e4 3226 struct nfs_server *server = NFS_SERVER(inode);
a5d16a4d
TM		 3227
3228 p = kzalloc(sizeof(*p), GFP_KERNEL);
3229 if (p == NULL)
3230 return NULL;
3231
3232 p->arg.fh = NFS_FH(inode);
3233 p->arg.fl = &p->fl;
3234 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3235 if (p->arg.lock_seqid == NULL)
3236 goto out_free;
3237 p->arg.lock_stateid = &lsp->ls_stateid;
7539bbab 3238 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
a5d16a4d
TM		 3239 p->arg.lock_owner.id = lsp->ls_id;
3240 p->lsp = lsp;
3241 atomic_inc(&lsp->ls_count);
3242 p->ctx = get_nfs_open_context(ctx);
3243 memcpy(&p->fl, fl, sizeof(p->fl));
3244 return p;
3245out_free:
3246 kfree(p);
3247 return NULL;
3248}
3249
3250static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3251{
3252 struct nfs4_lockdata *data = calldata;
3253 struct nfs4_state *state = data->lsp->ls_state;
3254 struct nfs4_state_owner *sp = state->owner;
1da177e4 3255 struct rpc_message msg = {
a5d16a4d
TM		 3256 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3257 .rpc_argp = &data->arg,
3258 .rpc_resp = &data->res,
3259 .rpc_cred = sp->so_cred,
1da177e4 3260 };
06735b34 3261
a5d16a4d
TM		 3262 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3263 return;
3264 dprintk("%s: begin!\n", __FUNCTION__);
3265 /* Do we need to do an open_to_lock_owner? */
3266 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3267 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3268 if (data->arg.open_seqid == NULL) {
3269 data->rpc_status = -ENOMEM;
3270 task->tk_action = NULL;
06735b34 3271 goto out;
8d0a8a9d 3272 }
a5d16a4d
TM		 3273 data->arg.open_stateid = &state->stateid;
3274 data->arg.new_lock_owner = 1;
3275 }
26e976a8 3276 data->timestamp = jiffies;
a5d16a4d 3277 rpc_call_setup(task, &msg, 0);
06735b34 3278out:
a5d16a4d
TM		 3279 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3280}
3281
3282static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3283{
3284 struct nfs4_lockdata *data = calldata;
3285
3286 dprintk("%s: begin!\n", __FUNCTION__);
3287
3288 data->rpc_status = task->tk_status;
3289 if (RPC_ASSASSINATED(task))
3290 goto out;
3291 if (data->arg.new_lock_owner != 0) {
3292 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3293 if (data->rpc_status == 0)
3294 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3295 else
3296 goto out;
3297 }
3298 if (data->rpc_status == 0) {
3299 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3300 sizeof(data->lsp->ls_stateid.data));
3301 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
88be9f99 3302 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
a5d16a4d
TM		 3303 }
3304 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3305out:
3306 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3307}
3308
3309static void nfs4_lock_release(void *calldata)
3310{
3311 struct nfs4_lockdata *data = calldata;
3312
3313 dprintk("%s: begin!\n", __FUNCTION__);
3314 if (data->arg.open_seqid != NULL)
3315 nfs_free_seqid(data->arg.open_seqid);
3316 if (data->cancelled != 0) {
3317 struct rpc_task *task;
3318 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3319 data->arg.lock_seqid);
3320 if (!IS_ERR(task))
e6b3c4db 3321 rpc_put_task(task);
a5d16a4d
TM		 3322 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3323 } else
3324 nfs_free_seqid(data->arg.lock_seqid);
3325 nfs4_put_lock_state(data->lsp);
3326 put_nfs_open_context(data->ctx);
3327 kfree(data);
3328 dprintk("%s: done!\n", __FUNCTION__);
3329}
3330
3331static const struct rpc_call_ops nfs4_lock_ops = {
3332 .rpc_call_prepare = nfs4_lock_prepare,
3333 .rpc_call_done = nfs4_lock_done,
3334 .rpc_release = nfs4_lock_release,
3335};
3336
3337static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3338{
3339 struct nfs4_lockdata *data;
3340 struct rpc_task *task;
3341 int ret;
3342
3343 dprintk("%s: begin!\n", __FUNCTION__);
3344 data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3345 fl->fl_u.nfs4_fl.owner);
3346 if (data == NULL)
3347 return -ENOMEM;
3348 if (IS_SETLKW(cmd))
3349 data->arg.block = 1;
3350 if (reclaim != 0)
3351 data->arg.reclaim = 1;
3352 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3353 &nfs4_lock_ops, data);
7a1218a2 3354 if (IS_ERR(task))
a5d16a4d 3355 return PTR_ERR(task);
a5d16a4d
TM		 3356 ret = nfs4_wait_for_completion_rpc_task(task);
3357 if (ret == 0) {
3358 ret = data->rpc_status;
3359 if (ret == -NFS4ERR_DENIED)
3360 ret = -EAGAIN;
3361 } else
3362 data->cancelled = 1;
e6b3c4db 3363 rpc_put_task(task);
a5d16a4d
TM		 3364 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3365 return ret;
1da177e4
LT		 3366}
3367
3368static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3369{
202b50dc
TM		 3370 struct nfs_server *server = NFS_SERVER(state->inode);
3371 struct nfs4_exception exception = { };
3372 int err;
3373
3374 do {
42a2d13e
TM		 3375 /* Cache the lock if possible... */
3376 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3377 return 0;
202b50dc
TM		 3378 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3379 if (err != -NFS4ERR_DELAY)
3380 break;
3381 nfs4_handle_exception(server, err, &exception);
3382 } while (exception.retry);
3383 return err;
1da177e4
LT		 3384}
3385
3386static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3387{
202b50dc
TM		 3388 struct nfs_server *server = NFS_SERVER(state->inode);
3389 struct nfs4_exception exception = { };
3390 int err;
3391
6bfc93ef
TM		 3392 err = nfs4_set_lock_state(state, request);
3393 if (err != 0)
3394 return err;
202b50dc 3395 do {
42a2d13e
TM		 3396 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3397 return 0;
202b50dc
TM		 3398 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3399 if (err != -NFS4ERR_DELAY)
3400 break;
3401 nfs4_handle_exception(server, err, &exception);
3402 } while (exception.retry);
3403 return err;
1da177e4
LT		 3404}
3405
3406static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3407{
adfa6f98 3408 struct nfs_client *clp = state->owner->so_client;
01c3b861 3409 unsigned char fl_flags = request->fl_flags;
1da177e4
LT		 3410 int status;
3411
6bfc93ef 3412 /* Is this a delegated open? */
6bfc93ef
TM		 3413 status = nfs4_set_lock_state(state, request);
3414 if (status != 0)
3415 goto out;
01c3b861
TM		 3416 request->fl_flags |= FL_ACCESS;
3417 status = do_vfs_lock(request->fl_file, request);
3418 if (status < 0)
3419 goto out;
3420 down_read(&clp->cl_sem);
3421 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3422 struct nfs_inode *nfsi = NFS_I(state->inode);
3423 /* Yes: cache locks! */
3424 down_read(&nfsi->rwsem);
3425 /* ...but avoid races with delegation recall... */
3426 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3427 request->fl_flags = fl_flags & ~FL_SLEEP;
3428 status = do_vfs_lock(request->fl_file, request);
3429 up_read(&nfsi->rwsem);
3430 goto out_unlock;
3431 }
3432 up_read(&nfsi->rwsem);
3433 }
6bfc93ef
TM		 3434 status = _nfs4_do_setlk(state, cmd, request, 0);
3435 if (status != 0)
01c3b861 3436 goto out_unlock;
6bfc93ef 3437 /* Note: we always want to sleep here! */
01c3b861 3438 request->fl_flags = fl_flags | FL_SLEEP;
6bfc93ef
TM		 3439 if (do_vfs_lock(request->fl_file, request) < 0)
3440 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
01c3b861 3441out_unlock:
1da177e4 3442 up_read(&clp->cl_sem);
01c3b861
TM		 3443out:
3444 request->fl_flags = fl_flags;
1da177e4
LT		 3445 return status;
3446}
3447
3448static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3449{
3450 struct nfs4_exception exception = { };
3451 int err;
3452
3453 do {
3454 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3455 _nfs4_proc_setlk(state, cmd, request),
3456 &exception);
3457 } while (exception.retry);
3458 return err;
3459}
3460
3461static int
3462nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3463{
3464 struct nfs_open_context *ctx;
3465 struct nfs4_state *state;
3466 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3467 int status;
3468
3469 /* verify open state */
3470 ctx = (struct nfs_open_context *)filp->private_data;
3471 state = ctx->state;
3472
3473 if (request->fl_start < 0 || request->fl_end < 0)
3474 return -EINVAL;
3475
3476 if (IS_GETLK(cmd))
3477 return nfs4_proc_getlk(state, F_GETLK, request);
3478
3479 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3480 return -EINVAL;
3481
3482 if (request->fl_type == F_UNLCK)
3483 return nfs4_proc_unlck(state, cmd, request);
3484
3485 do {
3486 status = nfs4_proc_setlk(state, cmd, request);
3487 if ((status != -EAGAIN) || IS_SETLK(cmd))
3488 break;
3489 timeout = nfs4_set_lock_task_retry(timeout);
3490 status = -ERESTARTSYS;
3491 if (signalled())
3492 break;
3493 } while(status < 0);
1da177e4
LT		 3494 return status;
3495}
3496
888e694c
TM		 3497int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3498{
3499 struct nfs_server *server = NFS_SERVER(state->inode);
3500 struct nfs4_exception exception = { };
3501 int err;
3502
3503 err = nfs4_set_lock_state(state, fl);
3504 if (err != 0)
3505 goto out;
3506 do {
3507 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3508 if (err != -NFS4ERR_DELAY)
3509 break;
3510 err = nfs4_handle_exception(server, err, &exception);
3511 } while (exception.retry);
3512out:
3513 return err;
3514}
6b3b5496 3515
aa1870af
BF		 3516#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3517
6b3b5496
BF		 3518int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3519 size_t buflen, int flags)
3520{
4b580ee3
BF		 3521 struct inode *inode = dentry->d_inode;
3522
3523 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3524 return -EOPNOTSUPP;
3525
3526 if (!S_ISREG(inode->i_mode) &&
3527 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3528 return -EPERM;
3529
3530 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3531}
3532
3533/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3534 * and that's what we'll do for e.g. user attributes that haven't been set.
3535 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3536 * attributes in kernel-managed attribute namespaces. */
3537ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3538 size_t buflen)
3539{
aa1870af
BF		 3540 struct inode *inode = dentry->d_inode;
3541
3542 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3543 return -EOPNOTSUPP;
3544
3545 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3546}
3547
3548ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3549{
aa1870af 3550 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496 3551
096455a2
BF		 3552 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3553 return 0;
6b3b5496
BF		 3554 if (buf && buflen < len)
3555 return -ERANGE;
3556 if (buf)
aa1870af
BF		 3557 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3558 return len;
6b3b5496
BF		 3559}
3560
c228fd3a 3561int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
7aaa0b3b 3562 struct nfs4_fs_locations *fs_locations, struct page *page)
683b57b4
TM		 3563{
3564 struct nfs_server *server = NFS_SERVER(dir);
3565 u32 bitmask[2] = {
361e624f
MN		 3566 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3567 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
683b57b4
TM		 3568 };
3569 struct nfs4_fs_locations_arg args = {
3570 .dir_fh = NFS_FH(dir),
c228fd3a 3571 .name = name,
683b57b4
TM		 3572 .page = page,
3573 .bitmask = bitmask,
3574 };
3575 struct rpc_message msg = {
3576 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3577 .rpc_argp = &args,
7aaa0b3b 3578 .rpc_resp = fs_locations,
683b57b4
TM		 3579 };
3580 int status;
3581
3582 dprintk("%s: start\n", __FUNCTION__);
c228fd3a 3583 nfs_fattr_init(&fs_locations->fattr);
683b57b4 3584 fs_locations->server = server;
830b8e33 3585 fs_locations->nlocations = 0;
683b57b4
TM		 3586 status = rpc_call_sync(server->client, &msg, 0);
3587 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3588 return status;
3589}
3590
1da177e4
LT		 3591struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3592 .recover_open = nfs4_open_reclaim,
3593 .recover_lock = nfs4_lock_reclaim,
3594};
3595
3596struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3597 .recover_open = nfs4_open_expired,
3598 .recover_lock = nfs4_lock_expired,
3599};
3600
92e1d5be 3601static const struct inode_operations nfs4_file_inode_operations = {
6b3b5496
BF		 3602 .permission = nfs_permission,
3603 .getattr = nfs_getattr,
3604 .setattr = nfs_setattr,
3605 .getxattr = nfs4_getxattr,
3606 .setxattr = nfs4_setxattr,
3607 .listxattr = nfs4_listxattr,
3608};
3609
509de811 3610const struct nfs_rpc_ops nfs_v4_clientops = {
1da177e4
LT		 3611 .version = 4, /* protocol version */
3612 .dentry_ops = &nfs4_dentry_operations,
3613 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3614 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3615 .getroot = nfs4_proc_get_root,
3616 .getattr = nfs4_proc_getattr,
3617 .setattr = nfs4_proc_setattr,
2b3de441 3618 .lookupfh = nfs4_proc_lookupfh,
1da177e4
LT		 3619 .lookup = nfs4_proc_lookup,
3620 .access = nfs4_proc_access,
3621 .readlink = nfs4_proc_readlink,
1da177e4
LT		 3622 .create = nfs4_proc_create,
3623 .remove = nfs4_proc_remove,
3624 .unlink_setup = nfs4_proc_unlink_setup,
3625 .unlink_done = nfs4_proc_unlink_done,
3626 .rename = nfs4_proc_rename,
3627 .link = nfs4_proc_link,
3628 .symlink = nfs4_proc_symlink,
3629 .mkdir = nfs4_proc_mkdir,
3630 .rmdir = nfs4_proc_remove,
3631 .readdir = nfs4_proc_readdir,
3632 .mknod = nfs4_proc_mknod,
3633 .statfs = nfs4_proc_statfs,
3634 .fsinfo = nfs4_proc_fsinfo,
3635 .pathconf = nfs4_proc_pathconf,
e9326dca 3636 .set_capabilities = nfs4_server_capabilities,
1da177e4
LT		 3637 .decode_dirent = nfs4_decode_dirent,
3638 .read_setup = nfs4_proc_read_setup,
ec06c096 3639 .read_done = nfs4_read_done,
1da177e4 3640 .write_setup = nfs4_proc_write_setup,
788e7a89 3641 .write_done = nfs4_write_done,
1da177e4 3642 .commit_setup = nfs4_proc_commit_setup,
788e7a89 3643 .commit_done = nfs4_commit_done,
02a913a7
TM		 3644 .file_open = nfs_open,
3645 .file_release = nfs_release,
1da177e4 3646 .lock = nfs4_proc_lock,
e50a1c2e 3647 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3648};
3649
3650/*
3651 * Local variables:
3652 * c-basic-offset: 8
3653 * End:
3654 */
Linux 6.x block layer and io_uring tree(s)