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NFS: Convert struct nfs_open_context to use a kref
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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>
50#include <linux/mount.h>
51
52#include "nfs4_fs.h"
53#include "delegation.h"
54#include "iostat.h"
55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
58#define NFS4_POLL_RETRY_MIN (HZ/10)
59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
61struct nfs4_opendata;
62static int _nfs4_proc_open(struct nfs4_opendata *data);
63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
65static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
66static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
67static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
68
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
109const u32 nfs4_pathconf_bitmap[2] = {
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
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
141static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
142 struct nfs4_readdir_arg *readdir)
143{
144 __be32 *start, *p;
145
146 BUG_ON(readdir->count < 80);
147 if (cookie > 2) {
148 readdir->cookie = cookie;
149 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
150 return;
151 }
152
153 readdir->cookie = 0;
154 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
155 if (cookie == 2)
156 return;
157
158 /*
159 * NFSv4 servers do not return entries for '.' and '..'
160 * Therefore, we fake these entries here. We let '.'
161 * have cookie 0 and '..' have cookie 1. Note that
162 * when talking to the server, we always send cookie 0
163 * instead of 1 or 2.
164 */
165 start = p = kmap_atomic(*readdir->pages, KM_USER0);
166
167 if (cookie == 0) {
168 *p++ = xdr_one; /* next */
169 *p++ = xdr_zero; /* cookie, first word */
170 *p++ = xdr_one; /* cookie, second word */
171 *p++ = xdr_one; /* entry len */
172 memcpy(p, ".\0\0\0", 4); /* entry */
173 p++;
174 *p++ = xdr_one; /* bitmap length */
175 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
176 *p++ = htonl(8); /* attribute buffer length */
177 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
178 }
179
180 *p++ = xdr_one; /* next */
181 *p++ = xdr_zero; /* cookie, first word */
182 *p++ = xdr_two; /* cookie, second word */
183 *p++ = xdr_two; /* entry len */
184 memcpy(p, "..\0\0", 4); /* entry */
185 p++;
186 *p++ = xdr_one; /* bitmap length */
187 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
188 *p++ = htonl(8); /* attribute buffer length */
189 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
190
191 readdir->pgbase = (char *)p - (char *)start;
192 readdir->count -= readdir->pgbase;
193 kunmap_atomic(start, KM_USER0);
194}
195
196static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
197{
198 struct nfs_client *clp = server->nfs_client;
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
205static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
206{
207 struct nfs_inode *nfsi = NFS_I(dir);
208
209 spin_lock(&dir->i_lock);
210 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
211 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
212 nfsi->change_attr = cinfo->after;
213 spin_unlock(&dir->i_lock);
214}
215
216struct nfs4_opendata {
217 atomic_t count;
218 struct nfs_openargs o_arg;
219 struct nfs_openres o_res;
220 struct nfs_open_confirmargs c_arg;
221 struct nfs_open_confirmres c_res;
222 struct nfs_fattr f_attr;
223 struct nfs_fattr dir_attr;
224 struct path path;
225 struct dentry *dir;
226 struct nfs4_state_owner *owner;
227 struct iattr attrs;
228 unsigned long timestamp;
229 int rpc_status;
230 int cancelled;
231};
232
233static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
234 struct nfs4_state_owner *sp, int flags,
235 const struct iattr *attrs)
236{
237 struct dentry *parent = dget_parent(path->dentry);
238 struct inode *dir = parent->d_inode;
239 struct nfs_server *server = NFS_SERVER(dir);
240 struct nfs4_opendata *p;
241
242 p = kzalloc(sizeof(*p), GFP_KERNEL);
243 if (p == NULL)
244 goto err;
245 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
246 if (p->o_arg.seqid == NULL)
247 goto err_free;
248 atomic_set(&p->count, 1);
249 p->path.mnt = mntget(path->mnt);
250 p->path.dentry = dget(path->dentry);
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,
256 p->o_arg.clientid = server->nfs_client->cl_clientid;
257 p->o_arg.id = sp->so_id;
258 p->o_arg.name = &p->path.dentry->d_name;
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 }
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;
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{
288 if (p != NULL && atomic_dec_and_test(&p->count)) {
289 nfs_free_seqid(p->o_arg.seqid);
290 nfs4_put_state_owner(p->owner);
291 dput(p->dir);
292 dput(p->path.dentry);
293 mntput(p->path.mnt);
294 kfree(p);
295 }
296}
297
298static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
299{
300 sigset_t oldset;
301 int ret;
302
303 rpc_clnt_sigmask(task->tk_client, &oldset);
304 ret = rpc_wait_for_completion_task(task);
305 rpc_clnt_sigunmask(task->tk_client, &oldset);
306 return ret;
307}
308
309static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
310{
311 switch (open_flags) {
312 case FMODE_WRITE:
313 state->n_wronly++;
314 break;
315 case FMODE_READ:
316 state->n_rdonly++;
317 break;
318 case FMODE_READ|FMODE_WRITE:
319 state->n_rdwr++;
320 }
321}
322
323static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
324{
325 struct inode *inode = state->inode;
326
327 open_flags &= (FMODE_READ|FMODE_WRITE);
328 /* Protect against nfs4_find_state_byowner() */
329 spin_lock(&state->owner->so_lock);
330 spin_lock(&inode->i_lock);
331 memcpy(&state->stateid, stateid, sizeof(state->stateid));
332 update_open_stateflags(state, open_flags);
333 nfs4_state_set_mode_locked(state, state->state | open_flags);
334 spin_unlock(&inode->i_lock);
335 spin_unlock(&state->owner->so_lock);
336}
337
338static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
339{
340 struct inode *inode;
341 struct nfs4_state *state = NULL;
342
343 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
344 goto out;
345 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
346 if (IS_ERR(inode))
347 goto out;
348 state = nfs4_get_open_state(inode, data->owner);
349 if (state == NULL)
350 goto put_inode;
351 update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
352put_inode:
353 iput(inode);
354out:
355 return state;
356}
357
358static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
359{
360 struct nfs_inode *nfsi = NFS_I(state->inode);
361 struct nfs_open_context *ctx;
362
363 spin_lock(&state->inode->i_lock);
364 list_for_each_entry(ctx, &nfsi->open_files, list) {
365 if (ctx->state != state)
366 continue;
367 get_nfs_open_context(ctx);
368 spin_unlock(&state->inode->i_lock);
369 return ctx;
370 }
371 spin_unlock(&state->inode->i_lock);
372 return ERR_PTR(-ENOENT);
373}
374
375static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
376{
377 int ret;
378
379 opendata->o_arg.open_flags = openflags;
380 ret = _nfs4_proc_open(opendata);
381 if (ret != 0)
382 return ret;
383 memcpy(stateid->data, opendata->o_res.stateid.data,
384 sizeof(stateid->data));
385 return 0;
386}
387
388static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
389{
390 nfs4_stateid stateid;
391 struct nfs4_state *newstate;
392 int mode = 0;
393 int delegation = 0;
394 int ret;
395
396 /* memory barrier prior to reading state->n_* */
397 smp_rmb();
398 if (state->n_rdwr != 0) {
399 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
400 if (ret != 0)
401 return ret;
402 mode |= FMODE_READ|FMODE_WRITE;
403 if (opendata->o_res.delegation_type != 0)
404 delegation = opendata->o_res.delegation_type;
405 smp_rmb();
406 }
407 if (state->n_wronly != 0) {
408 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
409 if (ret != 0)
410 return ret;
411 mode |= FMODE_WRITE;
412 if (opendata->o_res.delegation_type != 0)
413 delegation = opendata->o_res.delegation_type;
414 smp_rmb();
415 }
416 if (state->n_rdonly != 0) {
417 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
418 if (ret != 0)
419 return ret;
420 mode |= FMODE_READ;
421 }
422 clear_bit(NFS_DELEGATED_STATE, &state->flags);
423 if (mode == 0)
424 return 0;
425 if (opendata->o_res.delegation_type == 0)
426 opendata->o_res.delegation_type = delegation;
427 opendata->o_arg.open_flags |= mode;
428 newstate = nfs4_opendata_to_nfs4_state(opendata);
429 if (newstate != NULL) {
430 if (opendata->o_res.delegation_type != 0) {
431 struct nfs_inode *nfsi = NFS_I(newstate->inode);
432 int delegation_flags = 0;
433 if (nfsi->delegation)
434 delegation_flags = nfsi->delegation->flags;
435 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
436 nfs_inode_set_delegation(newstate->inode,
437 opendata->owner->so_cred,
438 &opendata->o_res);
439 else
440 nfs_inode_reclaim_delegation(newstate->inode,
441 opendata->owner->so_cred,
442 &opendata->o_res);
443 }
444 nfs4_close_state(&opendata->path, newstate, opendata->o_arg.open_flags);
445 }
446 if (newstate != state)
447 return -ESTALE;
448 return 0;
449}
450
451/*
452 * OPEN_RECLAIM:
453 * reclaim state on the server after a reboot.
454 */
455static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
456{
457 struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
458 struct nfs4_opendata *opendata;
459 int delegation_type = 0;
460 int status;
461
462 if (delegation != NULL) {
463 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
464 memcpy(&state->stateid, &delegation->stateid,
465 sizeof(state->stateid));
466 set_bit(NFS_DELEGATED_STATE, &state->flags);
467 return 0;
468 }
469 delegation_type = delegation->type;
470 }
471 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
472 if (opendata == NULL)
473 return -ENOMEM;
474 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
475 opendata->o_arg.fh = NFS_FH(state->inode);
476 nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
477 opendata->o_arg.u.delegation_type = delegation_type;
478 status = nfs4_open_recover(opendata, state);
479 nfs4_opendata_free(opendata);
480 return status;
481}
482
483static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
484{
485 struct nfs_server *server = NFS_SERVER(state->inode);
486 struct nfs4_exception exception = { };
487 int err;
488 do {
489 err = _nfs4_do_open_reclaim(ctx, state);
490 if (err != -NFS4ERR_DELAY)
491 break;
492 nfs4_handle_exception(server, err, &exception);
493 } while (exception.retry);
494 return err;
495}
496
497static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
498{
499 struct nfs_open_context *ctx;
500 int ret;
501
502 ctx = nfs4_state_find_open_context(state);
503 if (IS_ERR(ctx))
504 return PTR_ERR(ctx);
505 ret = nfs4_do_open_reclaim(ctx, state);
506 put_nfs_open_context(ctx);
507 return ret;
508}
509
510static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state)
511{
512 struct nfs4_state_owner *sp = state->owner;
513 struct nfs4_opendata *opendata;
514 int ret;
515
516 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
517 return 0;
518 opendata = nfs4_opendata_alloc(&ctx->path, sp, 0, NULL);
519 if (opendata == NULL)
520 return -ENOMEM;
521 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
522 memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
523 sizeof(opendata->o_arg.u.delegation.data));
524 ret = nfs4_open_recover(opendata, state);
525 nfs4_opendata_free(opendata);
526 return ret;
527}
528
529int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state)
530{
531 struct nfs4_exception exception = { };
532 struct nfs_server *server = NFS_SERVER(state->inode);
533 int err;
534 do {
535 err = _nfs4_open_delegation_recall(ctx, state);
536 switch (err) {
537 case 0:
538 return err;
539 case -NFS4ERR_STALE_CLIENTID:
540 case -NFS4ERR_STALE_STATEID:
541 case -NFS4ERR_EXPIRED:
542 /* Don't recall a delegation if it was lost */
543 nfs4_schedule_state_recovery(server->nfs_client);
544 return err;
545 }
546 err = nfs4_handle_exception(server, err, &exception);
547 } while (exception.retry);
548 return err;
549}
550
551static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
552{
553 struct nfs4_opendata *data = calldata;
554 struct rpc_message msg = {
555 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
556 .rpc_argp = &data->c_arg,
557 .rpc_resp = &data->c_res,
558 .rpc_cred = data->owner->so_cred,
559 };
560 data->timestamp = jiffies;
561 rpc_call_setup(task, &msg, 0);
562}
563
564static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
565{
566 struct nfs4_opendata *data = calldata;
567
568 data->rpc_status = task->tk_status;
569 if (RPC_ASSASSINATED(task))
570 return;
571 if (data->rpc_status == 0) {
572 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
573 sizeof(data->o_res.stateid.data));
574 renew_lease(data->o_res.server, data->timestamp);
575 }
576 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
577 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
578}
579
580static void nfs4_open_confirm_release(void *calldata)
581{
582 struct nfs4_opendata *data = calldata;
583 struct nfs4_state *state = NULL;
584
585 /* If this request hasn't been cancelled, do nothing */
586 if (data->cancelled == 0)
587 goto out_free;
588 /* In case of error, no cleanup! */
589 if (data->rpc_status != 0)
590 goto out_free;
591 nfs_confirm_seqid(&data->owner->so_seqid, 0);
592 state = nfs4_opendata_to_nfs4_state(data);
593 if (state != NULL)
594 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
595out_free:
596 nfs4_opendata_free(data);
597}
598
599static const struct rpc_call_ops nfs4_open_confirm_ops = {
600 .rpc_call_prepare = nfs4_open_confirm_prepare,
601 .rpc_call_done = nfs4_open_confirm_done,
602 .rpc_release = nfs4_open_confirm_release,
603};
604
605/*
606 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
607 */
608static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
609{
610 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
611 struct rpc_task *task;
612 int status;
613
614 atomic_inc(&data->count);
615 /*
616 * If rpc_run_task() ends up calling ->rpc_release(), we
617 * want to ensure that it takes the 'error' code path.
618 */
619 data->rpc_status = -ENOMEM;
620 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
621 if (IS_ERR(task))
622 return PTR_ERR(task);
623 status = nfs4_wait_for_completion_rpc_task(task);
624 if (status != 0) {
625 data->cancelled = 1;
626 smp_wmb();
627 } else
628 status = data->rpc_status;
629 rpc_put_task(task);
630 return status;
631}
632
633static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
634{
635 struct nfs4_opendata *data = calldata;
636 struct nfs4_state_owner *sp = data->owner;
637 struct rpc_message msg = {
638 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
639 .rpc_argp = &data->o_arg,
640 .rpc_resp = &data->o_res,
641 .rpc_cred = sp->so_cred,
642 };
643
644 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
645 return;
646 /* Update sequence id. */
647 data->o_arg.id = sp->so_id;
648 data->o_arg.clientid = sp->so_client->cl_clientid;
649 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
650 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
651 data->timestamp = jiffies;
652 rpc_call_setup(task, &msg, 0);
653}
654
655static void nfs4_open_done(struct rpc_task *task, void *calldata)
656{
657 struct nfs4_opendata *data = calldata;
658
659 data->rpc_status = task->tk_status;
660 if (RPC_ASSASSINATED(task))
661 return;
662 if (task->tk_status == 0) {
663 switch (data->o_res.f_attr->mode & S_IFMT) {
664 case S_IFREG:
665 break;
666 case S_IFLNK:
667 data->rpc_status = -ELOOP;
668 break;
669 case S_IFDIR:
670 data->rpc_status = -EISDIR;
671 break;
672 default:
673 data->rpc_status = -ENOTDIR;
674 }
675 renew_lease(data->o_res.server, data->timestamp);
676 }
677 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
678}
679
680static void nfs4_open_release(void *calldata)
681{
682 struct nfs4_opendata *data = calldata;
683 struct nfs4_state *state = NULL;
684
685 /* If this request hasn't been cancelled, do nothing */
686 if (data->cancelled == 0)
687 goto out_free;
688 /* In case of error, no cleanup! */
689 if (data->rpc_status != 0)
690 goto out_free;
691 /* In case we need an open_confirm, no cleanup! */
692 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
693 goto out_free;
694 nfs_confirm_seqid(&data->owner->so_seqid, 0);
695 state = nfs4_opendata_to_nfs4_state(data);
696 if (state != NULL)
697 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
698out_free:
699 nfs4_opendata_free(data);
700}
701
702static const struct rpc_call_ops nfs4_open_ops = {
703 .rpc_call_prepare = nfs4_open_prepare,
704 .rpc_call_done = nfs4_open_done,
705 .rpc_release = nfs4_open_release,
706};
707
708/*
709 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
710 */
711static int _nfs4_proc_open(struct nfs4_opendata *data)
712{
713 struct inode *dir = data->dir->d_inode;
714 struct nfs_server *server = NFS_SERVER(dir);
715 struct nfs_openargs *o_arg = &data->o_arg;
716 struct nfs_openres *o_res = &data->o_res;
717 struct rpc_task *task;
718 int status;
719
720 atomic_inc(&data->count);
721 /*
722 * If rpc_run_task() ends up calling ->rpc_release(), we
723 * want to ensure that it takes the 'error' code path.
724 */
725 data->rpc_status = -ENOMEM;
726 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
727 if (IS_ERR(task))
728 return PTR_ERR(task);
729 status = nfs4_wait_for_completion_rpc_task(task);
730 if (status != 0) {
731 data->cancelled = 1;
732 smp_wmb();
733 } else
734 status = data->rpc_status;
735 rpc_put_task(task);
736 if (status != 0)
737 return status;
738
739 if (o_arg->open_flags & O_CREAT) {
740 update_changeattr(dir, &o_res->cinfo);
741 nfs_post_op_update_inode(dir, o_res->dir_attr);
742 } else
743 nfs_refresh_inode(dir, o_res->dir_attr);
744 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
745 status = _nfs4_proc_open_confirm(data);
746 if (status != 0)
747 return status;
748 }
749 nfs_confirm_seqid(&data->owner->so_seqid, 0);
750 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
751 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
752 return 0;
753}
754
755static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
756{
757 struct nfs_access_entry cache;
758 int mask = 0;
759 int status;
760
761 if (openflags & FMODE_READ)
762 mask |= MAY_READ;
763 if (openflags & FMODE_WRITE)
764 mask |= MAY_WRITE;
765 status = nfs_access_get_cached(inode, cred, &cache);
766 if (status == 0)
767 goto out;
768
769 /* Be clever: ask server to check for all possible rights */
770 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
771 cache.cred = cred;
772 cache.jiffies = jiffies;
773 status = _nfs4_proc_access(inode, &cache);
774 if (status != 0)
775 return status;
776 nfs_access_add_cache(inode, &cache);
777out:
778 if ((cache.mask & mask) == mask)
779 return 0;
780 return -EACCES;
781}
782
783static int nfs4_recover_expired_lease(struct nfs_server *server)
784{
785 struct nfs_client *clp = server->nfs_client;
786 int ret;
787
788 for (;;) {
789 ret = nfs4_wait_clnt_recover(server->client, clp);
790 if (ret != 0)
791 return ret;
792 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
793 break;
794 nfs4_schedule_state_recovery(clp);
795 }
796 return 0;
797}
798
799/*
800 * OPEN_EXPIRED:
801 * reclaim state on the server after a network partition.
802 * Assumes caller holds the appropriate lock
803 */
804static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
805{
806 struct inode *inode = state->inode;
807 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
808 struct nfs4_opendata *opendata;
809 int openflags = state->state & (FMODE_READ|FMODE_WRITE);
810 int ret;
811
812 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
813 ret = _nfs4_do_access(inode, ctx->cred, openflags);
814 if (ret < 0)
815 return ret;
816 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
817 set_bit(NFS_DELEGATED_STATE, &state->flags);
818 return 0;
819 }
820 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, openflags, NULL);
821 if (opendata == NULL)
822 return -ENOMEM;
823 ret = nfs4_open_recover(opendata, state);
824 if (ret == -ESTALE) {
825 /* Invalidate the state owner so we don't ever use it again */
826 nfs4_drop_state_owner(state->owner);
827 d_drop(ctx->path.dentry);
828 }
829 nfs4_opendata_free(opendata);
830 return ret;
831}
832
833static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
834{
835 struct nfs_server *server = NFS_SERVER(state->inode);
836 struct nfs4_exception exception = { };
837 int err;
838
839 do {
840 err = _nfs4_open_expired(ctx, state);
841 if (err == -NFS4ERR_DELAY)
842 nfs4_handle_exception(server, err, &exception);
843 } while (exception.retry);
844 return err;
845}
846
847static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
848{
849 struct nfs_open_context *ctx;
850 int ret;
851
852 ctx = nfs4_state_find_open_context(state);
853 if (IS_ERR(ctx))
854 return PTR_ERR(ctx);
855 ret = nfs4_do_open_expired(ctx, state);
856 put_nfs_open_context(ctx);
857 return ret;
858}
859
860/*
861 * Returns a referenced nfs4_state if there is an open delegation on the file
862 */
863static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
864{
865 struct nfs_delegation *delegation;
866 struct nfs_server *server = NFS_SERVER(inode);
867 struct nfs_client *clp = server->nfs_client;
868 struct nfs_inode *nfsi = NFS_I(inode);
869 struct nfs4_state_owner *sp = NULL;
870 struct nfs4_state *state = NULL;
871 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
872 int err;
873
874 err = -ENOMEM;
875 if (!(sp = nfs4_get_state_owner(server, cred))) {
876 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
877 return err;
878 }
879 err = nfs4_recover_expired_lease(server);
880 if (err != 0)
881 goto out_put_state_owner;
882 /* Protect against reboot recovery - NOTE ORDER! */
883 down_read(&clp->cl_sem);
884 /* Protect against delegation recall */
885 down_read(&nfsi->rwsem);
886 delegation = NFS_I(inode)->delegation;
887 err = -ENOENT;
888 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
889 goto out_err;
890 err = -ENOMEM;
891 state = nfs4_get_open_state(inode, sp);
892 if (state == NULL)
893 goto out_err;
894
895 err = -ENOENT;
896 if ((state->state & open_flags) == open_flags) {
897 spin_lock(&inode->i_lock);
898 update_open_stateflags(state, open_flags);
899 spin_unlock(&inode->i_lock);
900 goto out_ok;
901 } else if (state->state != 0)
902 goto out_put_open_state;
903
904 lock_kernel();
905 err = _nfs4_do_access(inode, cred, open_flags);
906 unlock_kernel();
907 if (err != 0)
908 goto out_put_open_state;
909 set_bit(NFS_DELEGATED_STATE, &state->flags);
910 update_open_stateid(state, &delegation->stateid, open_flags);
911out_ok:
912 nfs4_put_state_owner(sp);
913 up_read(&nfsi->rwsem);
914 up_read(&clp->cl_sem);
915 *res = state;
916 return 0;
917out_put_open_state:
918 nfs4_put_open_state(state);
919out_err:
920 up_read(&nfsi->rwsem);
921 up_read(&clp->cl_sem);
922 if (err != -EACCES)
923 nfs_inode_return_delegation(inode);
924out_put_state_owner:
925 nfs4_put_state_owner(sp);
926 return err;
927}
928
929static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
930{
931 struct nfs4_exception exception = { };
932 struct nfs4_state *res = ERR_PTR(-EIO);
933 int err;
934
935 do {
936 err = _nfs4_open_delegated(inode, flags, cred, &res);
937 if (err == 0)
938 break;
939 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
940 err, &exception));
941 } while (exception.retry);
942 return res;
943}
944
945/*
946 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
947 * fields corresponding to attributes that were used to store the verifier.
948 * Make sure we clobber those fields in the later setattr call
949 */
950static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
951{
952 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
953 !(sattr->ia_valid & ATTR_ATIME_SET))
954 sattr->ia_valid |= ATTR_ATIME;
955
956 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
957 !(sattr->ia_valid & ATTR_MTIME_SET))
958 sattr->ia_valid |= ATTR_MTIME;
959}
960
961/*
962 * Returns a referenced nfs4_state
963 */
964static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
965{
966 struct nfs4_state_owner *sp;
967 struct nfs4_state *state = NULL;
968 struct nfs_server *server = NFS_SERVER(dir);
969 struct nfs_client *clp = server->nfs_client;
970 struct nfs4_opendata *opendata;
971 int status;
972
973 /* Protect against reboot recovery conflicts */
974 status = -ENOMEM;
975 if (!(sp = nfs4_get_state_owner(server, cred))) {
976 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
977 goto out_err;
978 }
979 status = nfs4_recover_expired_lease(server);
980 if (status != 0)
981 goto err_put_state_owner;
982 down_read(&clp->cl_sem);
983 status = -ENOMEM;
984 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
985 if (opendata == NULL)
986 goto err_release_rwsem;
987
988 status = _nfs4_proc_open(opendata);
989 if (status != 0)
990 goto err_opendata_free;
991
992 if (opendata->o_arg.open_flags & O_EXCL)
993 nfs4_exclusive_attrset(opendata, sattr);
994
995 status = -ENOMEM;
996 state = nfs4_opendata_to_nfs4_state(opendata);
997 if (state == NULL)
998 goto err_opendata_free;
999 if (opendata->o_res.delegation_type != 0)
1000 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
1001 nfs4_opendata_free(opendata);
1002 nfs4_put_state_owner(sp);
1003 up_read(&clp->cl_sem);
1004 *res = state;
1005 return 0;
1006err_opendata_free:
1007 nfs4_opendata_free(opendata);
1008err_release_rwsem:
1009 up_read(&clp->cl_sem);
1010err_put_state_owner:
1011 nfs4_put_state_owner(sp);
1012out_err:
1013 *res = NULL;
1014 return status;
1015}
1016
1017
1018static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1019{
1020 struct nfs4_exception exception = { };
1021 struct nfs4_state *res;
1022 int status;
1023
1024 do {
1025 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1026 if (status == 0)
1027 break;
1028 /* NOTE: BAD_SEQID means the server and client disagree about the
1029 * book-keeping w.r.t. state-changing operations
1030 * (OPEN/CLOSE/LOCK/LOCKU...)
1031 * It is actually a sign of a bug on the client or on the server.
1032 *
1033 * If we receive a BAD_SEQID error in the particular case of
1034 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1035 * have unhashed the old state_owner for us, and that we can
1036 * therefore safely retry using a new one. We should still warn
1037 * the user though...
1038 */
1039 if (status == -NFS4ERR_BAD_SEQID) {
1040 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1041 exception.retry = 1;
1042 continue;
1043 }
1044 /*
1045 * BAD_STATEID on OPEN means that the server cancelled our
1046 * state before it received the OPEN_CONFIRM.
1047 * Recover by retrying the request as per the discussion
1048 * on Page 181 of RFC3530.
1049 */
1050 if (status == -NFS4ERR_BAD_STATEID) {
1051 exception.retry = 1;
1052 continue;
1053 }
1054 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1055 status, &exception));
1056 } while (exception.retry);
1057 return res;
1058}
1059
1060static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1061 struct iattr *sattr, struct nfs4_state *state)
1062{
1063 struct nfs_server *server = NFS_SERVER(inode);
1064 struct nfs_setattrargs arg = {
1065 .fh = NFS_FH(inode),
1066 .iap = sattr,
1067 .server = server,
1068 .bitmask = server->attr_bitmask,
1069 };
1070 struct nfs_setattrres res = {
1071 .fattr = fattr,
1072 .server = server,
1073 };
1074 struct rpc_message msg = {
1075 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1076 .rpc_argp = &arg,
1077 .rpc_resp = &res,
1078 };
1079 unsigned long timestamp = jiffies;
1080 int status;
1081
1082 nfs_fattr_init(fattr);
1083
1084 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1085 /* Use that stateid */
1086 } else if (state != NULL) {
1087 msg.rpc_cred = state->owner->so_cred;
1088 nfs4_copy_stateid(&arg.stateid, state, current->files);
1089 } else
1090 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1091
1092 status = rpc_call_sync(server->client, &msg, 0);
1093 if (status == 0 && state != NULL)
1094 renew_lease(server, timestamp);
1095 return status;
1096}
1097
1098static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1099 struct iattr *sattr, struct nfs4_state *state)
1100{
1101 struct nfs_server *server = NFS_SERVER(inode);
1102 struct nfs4_exception exception = { };
1103 int err;
1104 do {
1105 err = nfs4_handle_exception(server,
1106 _nfs4_do_setattr(inode, fattr, sattr, state),
1107 &exception);
1108 } while (exception.retry);
1109 return err;
1110}
1111
1112struct nfs4_closedata {
1113 struct path path;
1114 struct inode *inode;
1115 struct nfs4_state *state;
1116 struct nfs_closeargs arg;
1117 struct nfs_closeres res;
1118 struct nfs_fattr fattr;
1119 unsigned long timestamp;
1120};
1121
1122static void nfs4_free_closedata(void *data)
1123{
1124 struct nfs4_closedata *calldata = data;
1125 struct nfs4_state_owner *sp = calldata->state->owner;
1126
1127 nfs4_put_open_state(calldata->state);
1128 nfs_free_seqid(calldata->arg.seqid);
1129 nfs4_put_state_owner(sp);
1130 dput(calldata->path.dentry);
1131 mntput(calldata->path.mnt);
1132 kfree(calldata);
1133}
1134
1135static void nfs4_close_done(struct rpc_task *task, void *data)
1136{
1137 struct nfs4_closedata *calldata = data;
1138 struct nfs4_state *state = calldata->state;
1139 struct nfs_server *server = NFS_SERVER(calldata->inode);
1140
1141 if (RPC_ASSASSINATED(task))
1142 return;
1143 /* hmm. we are done with the inode, and in the process of freeing
1144 * the state_owner. we keep this around to process errors
1145 */
1146 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1147 switch (task->tk_status) {
1148 case 0:
1149 memcpy(&state->stateid, &calldata->res.stateid,
1150 sizeof(state->stateid));
1151 renew_lease(server, calldata->timestamp);
1152 break;
1153 case -NFS4ERR_STALE_STATEID:
1154 case -NFS4ERR_EXPIRED:
1155 break;
1156 default:
1157 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1158 rpc_restart_call(task);
1159 return;
1160 }
1161 }
1162 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1163}
1164
1165static void nfs4_close_prepare(struct rpc_task *task, void *data)
1166{
1167 struct nfs4_closedata *calldata = data;
1168 struct nfs4_state *state = calldata->state;
1169 struct rpc_message msg = {
1170 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1171 .rpc_argp = &calldata->arg,
1172 .rpc_resp = &calldata->res,
1173 .rpc_cred = state->owner->so_cred,
1174 };
1175 int mode = 0, old_mode;
1176
1177 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1178 return;
1179 /* Recalculate the new open mode in case someone reopened the file
1180 * while we were waiting in line to be scheduled.
1181 */
1182 spin_lock(&state->owner->so_lock);
1183 spin_lock(&calldata->inode->i_lock);
1184 mode = old_mode = state->state;
1185 if (state->n_rdwr == 0) {
1186 if (state->n_rdonly == 0)
1187 mode &= ~FMODE_READ;
1188 if (state->n_wronly == 0)
1189 mode &= ~FMODE_WRITE;
1190 }
1191 nfs4_state_set_mode_locked(state, mode);
1192 spin_unlock(&calldata->inode->i_lock);
1193 spin_unlock(&state->owner->so_lock);
1194 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1195 /* Note: exit _without_ calling nfs4_close_done */
1196 task->tk_action = NULL;
1197 return;
1198 }
1199 nfs_fattr_init(calldata->res.fattr);
1200 if (mode != 0)
1201 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1202 calldata->arg.open_flags = mode;
1203 calldata->timestamp = jiffies;
1204 rpc_call_setup(task, &msg, 0);
1205}
1206
1207static const struct rpc_call_ops nfs4_close_ops = {
1208 .rpc_call_prepare = nfs4_close_prepare,
1209 .rpc_call_done = nfs4_close_done,
1210 .rpc_release = nfs4_free_closedata,
1211};
1212
1213/*
1214 * It is possible for data to be read/written from a mem-mapped file
1215 * after the sys_close call (which hits the vfs layer as a flush).
1216 * This means that we can't safely call nfsv4 close on a file until
1217 * the inode is cleared. This in turn means that we are not good
1218 * NFSv4 citizens - we do not indicate to the server to update the file's
1219 * share state even when we are done with one of the three share
1220 * stateid's in the inode.
1221 *
1222 * NOTE: Caller must be holding the sp->so_owner semaphore!
1223 */
1224int nfs4_do_close(struct path *path, struct nfs4_state *state)
1225{
1226 struct nfs_server *server = NFS_SERVER(state->inode);
1227 struct nfs4_closedata *calldata;
1228 struct nfs4_state_owner *sp = state->owner;
1229 struct rpc_task *task;
1230 int status = -ENOMEM;
1231
1232 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1233 if (calldata == NULL)
1234 goto out;
1235 calldata->inode = state->inode;
1236 calldata->state = state;
1237 calldata->arg.fh = NFS_FH(state->inode);
1238 calldata->arg.stateid = &state->stateid;
1239 /* Serialization for the sequence id */
1240 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1241 if (calldata->arg.seqid == NULL)
1242 goto out_free_calldata;
1243 calldata->arg.bitmask = server->attr_bitmask;
1244 calldata->res.fattr = &calldata->fattr;
1245 calldata->res.server = server;
1246 calldata->path.mnt = mntget(path->mnt);
1247 calldata->path.dentry = dget(path->dentry);
1248
1249 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1250 if (IS_ERR(task))
1251 return PTR_ERR(task);
1252 rpc_put_task(task);
1253 return 0;
1254out_free_calldata:
1255 kfree(calldata);
1256out:
1257 nfs4_put_open_state(state);
1258 nfs4_put_state_owner(sp);
1259 return status;
1260}
1261
1262static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1263{
1264 struct file *filp;
1265
1266 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1267 if (!IS_ERR(filp)) {
1268 struct nfs_open_context *ctx;
1269 ctx = (struct nfs_open_context *)filp->private_data;
1270 ctx->state = state;
1271 return 0;
1272 }
1273 nfs4_close_state(path, state, nd->intent.open.flags);
1274 return PTR_ERR(filp);
1275}
1276
1277struct dentry *
1278nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1279{
1280 struct path path = {
1281 .mnt = nd->mnt,
1282 .dentry = dentry,
1283 };
1284 struct iattr attr;
1285 struct rpc_cred *cred;
1286 struct nfs4_state *state;
1287 struct dentry *res;
1288
1289 if (nd->flags & LOOKUP_CREATE) {
1290 attr.ia_mode = nd->intent.open.create_mode;
1291 attr.ia_valid = ATTR_MODE;
1292 if (!IS_POSIXACL(dir))
1293 attr.ia_mode &= ~current->fs->umask;
1294 } else {
1295 attr.ia_valid = 0;
1296 BUG_ON(nd->intent.open.flags & O_CREAT);
1297 }
1298
1299 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1300 if (IS_ERR(cred))
1301 return (struct dentry *)cred;
1302 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1303 put_rpccred(cred);
1304 if (IS_ERR(state)) {
1305 if (PTR_ERR(state) == -ENOENT)
1306 d_add(dentry, NULL);
1307 return (struct dentry *)state;
1308 }
1309 res = d_add_unique(dentry, igrab(state->inode));
1310 if (res != NULL)
1311 dentry = res;
1312 nfs4_intent_set_file(nd, &path, state);
1313 return res;
1314}
1315
1316int
1317nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1318{
1319 struct path path = {
1320 .mnt = nd->mnt,
1321 .dentry = dentry,
1322 };
1323 struct rpc_cred *cred;
1324 struct nfs4_state *state;
1325
1326 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1327 if (IS_ERR(cred))
1328 return PTR_ERR(cred);
1329 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1330 if (IS_ERR(state))
1331 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1332 put_rpccred(cred);
1333 if (IS_ERR(state)) {
1334 switch (PTR_ERR(state)) {
1335 case -EPERM:
1336 case -EACCES:
1337 case -EDQUOT:
1338 case -ENOSPC:
1339 case -EROFS:
1340 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1341 return 1;
1342 default:
1343 goto out_drop;
1344 }
1345 }
1346 if (state->inode == dentry->d_inode) {
1347 nfs4_intent_set_file(nd, &path, state);
1348 return 1;
1349 }
1350 nfs4_close_state(&path, state, openflags);
1351out_drop:
1352 d_drop(dentry);
1353 return 0;
1354}
1355
1356
1357static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1358{
1359 struct nfs4_server_caps_res res = {};
1360 struct rpc_message msg = {
1361 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1362 .rpc_argp = fhandle,
1363 .rpc_resp = &res,
1364 };
1365 int status;
1366
1367 status = rpc_call_sync(server->client, &msg, 0);
1368 if (status == 0) {
1369 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1370 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1371 server->caps |= NFS_CAP_ACLS;
1372 if (res.has_links != 0)
1373 server->caps |= NFS_CAP_HARDLINKS;
1374 if (res.has_symlinks != 0)
1375 server->caps |= NFS_CAP_SYMLINKS;
1376 server->acl_bitmask = res.acl_bitmask;
1377 }
1378 return status;
1379}
1380
1381int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1382{
1383 struct nfs4_exception exception = { };
1384 int err;
1385 do {
1386 err = nfs4_handle_exception(server,
1387 _nfs4_server_capabilities(server, fhandle),
1388 &exception);
1389 } while (exception.retry);
1390 return err;
1391}
1392
1393static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1394 struct nfs_fsinfo *info)
1395{
1396 struct nfs4_lookup_root_arg args = {
1397 .bitmask = nfs4_fattr_bitmap,
1398 };
1399 struct nfs4_lookup_res res = {
1400 .server = server,
1401 .fattr = info->fattr,
1402 .fh = fhandle,
1403 };
1404 struct rpc_message msg = {
1405 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1406 .rpc_argp = &args,
1407 .rpc_resp = &res,
1408 };
1409 nfs_fattr_init(info->fattr);
1410 return rpc_call_sync(server->client, &msg, 0);
1411}
1412
1413static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1414 struct nfs_fsinfo *info)
1415{
1416 struct nfs4_exception exception = { };
1417 int err;
1418 do {
1419 err = nfs4_handle_exception(server,
1420 _nfs4_lookup_root(server, fhandle, info),
1421 &exception);
1422 } while (exception.retry);
1423 return err;
1424}
1425
1426/*
1427 * get the file handle for the "/" directory on the server
1428 */
1429static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1430 struct nfs_fsinfo *info)
1431{
1432 int status;
1433
1434 status = nfs4_lookup_root(server, fhandle, info);
1435 if (status == 0)
1436 status = nfs4_server_capabilities(server, fhandle);
1437 if (status == 0)
1438 status = nfs4_do_fsinfo(server, fhandle, info);
1439 return nfs4_map_errors(status);
1440}
1441
1442/*
1443 * Get locations and (maybe) other attributes of a referral.
1444 * Note that we'll actually follow the referral later when
1445 * we detect fsid mismatch in inode revalidation
1446 */
1447static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1448{
1449 int status = -ENOMEM;
1450 struct page *page = NULL;
1451 struct nfs4_fs_locations *locations = NULL;
1452
1453 page = alloc_page(GFP_KERNEL);
1454 if (page == NULL)
1455 goto out;
1456 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1457 if (locations == NULL)
1458 goto out;
1459
1460 status = nfs4_proc_fs_locations(dir, name, locations, page);
1461 if (status != 0)
1462 goto out;
1463 /* Make sure server returned a different fsid for the referral */
1464 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1465 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1466 status = -EIO;
1467 goto out;
1468 }
1469
1470 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1471 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1472 if (!fattr->mode)
1473 fattr->mode = S_IFDIR;
1474 memset(fhandle, 0, sizeof(struct nfs_fh));
1475out:
1476 if (page)
1477 __free_page(page);
1478 if (locations)
1479 kfree(locations);
1480 return status;
1481}
1482
1483static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1484{
1485 struct nfs4_getattr_arg args = {
1486 .fh = fhandle,
1487 .bitmask = server->attr_bitmask,
1488 };
1489 struct nfs4_getattr_res res = {
1490 .fattr = fattr,
1491 .server = server,
1492 };
1493 struct rpc_message msg = {
1494 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1495 .rpc_argp = &args,
1496 .rpc_resp = &res,
1497 };
1498
1499 nfs_fattr_init(fattr);
1500 return rpc_call_sync(server->client, &msg, 0);
1501}
1502
1503static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1504{
1505 struct nfs4_exception exception = { };
1506 int err;
1507 do {
1508 err = nfs4_handle_exception(server,
1509 _nfs4_proc_getattr(server, fhandle, fattr),
1510 &exception);
1511 } while (exception.retry);
1512 return err;
1513}
1514
1515/*
1516 * The file is not closed if it is opened due to the a request to change
1517 * the size of the file. The open call will not be needed once the
1518 * VFS layer lookup-intents are implemented.
1519 *
1520 * Close is called when the inode is destroyed.
1521 * If we haven't opened the file for O_WRONLY, we
1522 * need to in the size_change case to obtain a stateid.
1523 *
1524 * Got race?
1525 * Because OPEN is always done by name in nfsv4, it is
1526 * possible that we opened a different file by the same
1527 * name. We can recognize this race condition, but we
1528 * can't do anything about it besides returning an error.
1529 *
1530 * This will be fixed with VFS changes (lookup-intent).
1531 */
1532static int
1533nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1534 struct iattr *sattr)
1535{
1536 struct rpc_cred *cred;
1537 struct inode *inode = dentry->d_inode;
1538 struct nfs_open_context *ctx;
1539 struct nfs4_state *state = NULL;
1540 int status;
1541
1542 nfs_fattr_init(fattr);
1543
1544 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1545 if (IS_ERR(cred))
1546 return PTR_ERR(cred);
1547
1548 /* Search for an existing open(O_WRITE) file */
1549 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1550 if (ctx != NULL)
1551 state = ctx->state;
1552
1553 status = nfs4_do_setattr(inode, fattr, sattr, state);
1554 if (status == 0)
1555 nfs_setattr_update_inode(inode, sattr);
1556 if (ctx != NULL)
1557 put_nfs_open_context(ctx);
1558 put_rpccred(cred);
1559 return status;
1560}
1561
1562static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1563 struct qstr *name, struct nfs_fh *fhandle,
1564 struct nfs_fattr *fattr)
1565{
1566 int status;
1567 struct nfs4_lookup_arg args = {
1568 .bitmask = server->attr_bitmask,
1569 .dir_fh = dirfh,
1570 .name = name,
1571 };
1572 struct nfs4_lookup_res res = {
1573 .server = server,
1574 .fattr = fattr,
1575 .fh = fhandle,
1576 };
1577 struct rpc_message msg = {
1578 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1579 .rpc_argp = &args,
1580 .rpc_resp = &res,
1581 };
1582
1583 nfs_fattr_init(fattr);
1584
1585 dprintk("NFS call lookupfh %s\n", name->name);
1586 status = rpc_call_sync(server->client, &msg, 0);
1587 dprintk("NFS reply lookupfh: %d\n", status);
1588 if (status == -NFS4ERR_MOVED)
1589 status = -EREMOTE;
1590 return status;
1591}
1592
1593static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1594 struct qstr *name, struct nfs_fh *fhandle,
1595 struct nfs_fattr *fattr)
1596{
1597 struct nfs4_exception exception = { };
1598 int err;
1599 do {
1600 err = nfs4_handle_exception(server,
1601 _nfs4_proc_lookupfh(server, dirfh, name,
1602 fhandle, fattr),
1603 &exception);
1604 } while (exception.retry);
1605 return err;
1606}
1607
1608static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1609 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1610{
1611 int status;
1612 struct nfs_server *server = NFS_SERVER(dir);
1613 struct nfs4_lookup_arg args = {
1614 .bitmask = server->attr_bitmask,
1615 .dir_fh = NFS_FH(dir),
1616 .name = name,
1617 };
1618 struct nfs4_lookup_res res = {
1619 .server = server,
1620 .fattr = fattr,
1621 .fh = fhandle,
1622 };
1623 struct rpc_message msg = {
1624 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1625 .rpc_argp = &args,
1626 .rpc_resp = &res,
1627 };
1628
1629 nfs_fattr_init(fattr);
1630
1631 dprintk("NFS call lookup %s\n", name->name);
1632 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1633 if (status == -NFS4ERR_MOVED)
1634 status = nfs4_get_referral(dir, name, fattr, fhandle);
1635 dprintk("NFS reply lookup: %d\n", status);
1636 return status;
1637}
1638
1639static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1640{
1641 struct nfs4_exception exception = { };
1642 int err;
1643 do {
1644 err = nfs4_handle_exception(NFS_SERVER(dir),
1645 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1646 &exception);
1647 } while (exception.retry);
1648 return err;
1649}
1650
1651static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1652{
1653 struct nfs4_accessargs args = {
1654 .fh = NFS_FH(inode),
1655 };
1656 struct nfs4_accessres res = { 0 };
1657 struct rpc_message msg = {
1658 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1659 .rpc_argp = &args,
1660 .rpc_resp = &res,
1661 .rpc_cred = entry->cred,
1662 };
1663 int mode = entry->mask;
1664 int status;
1665
1666 /*
1667 * Determine which access bits we want to ask for...
1668 */
1669 if (mode & MAY_READ)
1670 args.access |= NFS4_ACCESS_READ;
1671 if (S_ISDIR(inode->i_mode)) {
1672 if (mode & MAY_WRITE)
1673 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1674 if (mode & MAY_EXEC)
1675 args.access |= NFS4_ACCESS_LOOKUP;
1676 } else {
1677 if (mode & MAY_WRITE)
1678 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1679 if (mode & MAY_EXEC)
1680 args.access |= NFS4_ACCESS_EXECUTE;
1681 }
1682 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1683 if (!status) {
1684 entry->mask = 0;
1685 if (res.access & NFS4_ACCESS_READ)
1686 entry->mask |= MAY_READ;
1687 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1688 entry->mask |= MAY_WRITE;
1689 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1690 entry->mask |= MAY_EXEC;
1691 }
1692 return status;
1693}
1694
1695static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1696{
1697 struct nfs4_exception exception = { };
1698 int err;
1699 do {
1700 err = nfs4_handle_exception(NFS_SERVER(inode),
1701 _nfs4_proc_access(inode, entry),
1702 &exception);
1703 } while (exception.retry);
1704 return err;
1705}
1706
1707/*
1708 * TODO: For the time being, we don't try to get any attributes
1709 * along with any of the zero-copy operations READ, READDIR,
1710 * READLINK, WRITE.
1711 *
1712 * In the case of the first three, we want to put the GETATTR
1713 * after the read-type operation -- this is because it is hard
1714 * to predict the length of a GETATTR response in v4, and thus
1715 * align the READ data correctly. This means that the GETATTR
1716 * may end up partially falling into the page cache, and we should
1717 * shift it into the 'tail' of the xdr_buf before processing.
1718 * To do this efficiently, we need to know the total length
1719 * of data received, which doesn't seem to be available outside
1720 * of the RPC layer.
1721 *
1722 * In the case of WRITE, we also want to put the GETATTR after
1723 * the operation -- in this case because we want to make sure
1724 * we get the post-operation mtime and size. This means that
1725 * we can't use xdr_encode_pages() as written: we need a variant
1726 * of it which would leave room in the 'tail' iovec.
1727 *
1728 * Both of these changes to the XDR layer would in fact be quite
1729 * minor, but I decided to leave them for a subsequent patch.
1730 */
1731static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1732 unsigned int pgbase, unsigned int pglen)
1733{
1734 struct nfs4_readlink args = {
1735 .fh = NFS_FH(inode),
1736 .pgbase = pgbase,
1737 .pglen = pglen,
1738 .pages = &page,
1739 };
1740 struct rpc_message msg = {
1741 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1742 .rpc_argp = &args,
1743 .rpc_resp = NULL,
1744 };
1745
1746 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1747}
1748
1749static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1750 unsigned int pgbase, unsigned int pglen)
1751{
1752 struct nfs4_exception exception = { };
1753 int err;
1754 do {
1755 err = nfs4_handle_exception(NFS_SERVER(inode),
1756 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1757 &exception);
1758 } while (exception.retry);
1759 return err;
1760}
1761
1762/*
1763 * Got race?
1764 * We will need to arrange for the VFS layer to provide an atomic open.
1765 * Until then, this create/open method is prone to inefficiency and race
1766 * conditions due to the lookup, create, and open VFS calls from sys_open()
1767 * placed on the wire.
1768 *
1769 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1770 * The file will be opened again in the subsequent VFS open call
1771 * (nfs4_proc_file_open).
1772 *
1773 * The open for read will just hang around to be used by any process that
1774 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1775 */
1776
1777static int
1778nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1779 int flags, struct nameidata *nd)
1780{
1781 struct path path = {
1782 .mnt = nd->mnt,
1783 .dentry = dentry,
1784 };
1785 struct nfs4_state *state;
1786 struct rpc_cred *cred;
1787 int status = 0;
1788
1789 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1790 if (IS_ERR(cred)) {
1791 status = PTR_ERR(cred);
1792 goto out;
1793 }
1794 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1795 put_rpccred(cred);
1796 if (IS_ERR(state)) {
1797 status = PTR_ERR(state);
1798 goto out;
1799 }
1800 d_instantiate(dentry, igrab(state->inode));
1801 if (flags & O_EXCL) {
1802 struct nfs_fattr fattr;
1803 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1804 if (status == 0)
1805 nfs_setattr_update_inode(state->inode, sattr);
1806 nfs_post_op_update_inode(state->inode, &fattr);
1807 }
1808 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1809 status = nfs4_intent_set_file(nd, &path, state);
1810 else
1811 nfs4_close_state(&path, state, flags);
1812out:
1813 return status;
1814}
1815
1816static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1817{
1818 struct nfs_server *server = NFS_SERVER(dir);
1819 struct nfs4_remove_arg args = {
1820 .fh = NFS_FH(dir),
1821 .name = name,
1822 .bitmask = server->attr_bitmask,
1823 };
1824 struct nfs_fattr dir_attr;
1825 struct nfs4_remove_res res = {
1826 .server = server,
1827 .dir_attr = &dir_attr,
1828 };
1829 struct rpc_message msg = {
1830 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1831 .rpc_argp = &args,
1832 .rpc_resp = &res,
1833 };
1834 int status;
1835
1836 nfs_fattr_init(res.dir_attr);
1837 status = rpc_call_sync(server->client, &msg, 0);
1838 if (status == 0) {
1839 update_changeattr(dir, &res.cinfo);
1840 nfs_post_op_update_inode(dir, res.dir_attr);
1841 }
1842 return status;
1843}
1844
1845static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1846{
1847 struct nfs4_exception exception = { };
1848 int err;
1849 do {
1850 err = nfs4_handle_exception(NFS_SERVER(dir),
1851 _nfs4_proc_remove(dir, name),
1852 &exception);
1853 } while (exception.retry);
1854 return err;
1855}
1856
1857struct unlink_desc {
1858 struct nfs4_remove_arg args;
1859 struct nfs4_remove_res res;
1860 struct nfs_fattr dir_attr;
1861};
1862
1863static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1864 struct qstr *name)
1865{
1866 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1867 struct unlink_desc *up;
1868
1869 up = kmalloc(sizeof(*up), GFP_KERNEL);
1870 if (!up)
1871 return -ENOMEM;
1872
1873 up->args.fh = NFS_FH(dir->d_inode);
1874 up->args.name = name;
1875 up->args.bitmask = server->attr_bitmask;
1876 up->res.server = server;
1877 up->res.dir_attr = &up->dir_attr;
1878
1879 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1880 msg->rpc_argp = &up->args;
1881 msg->rpc_resp = &up->res;
1882 return 0;
1883}
1884
1885static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1886{
1887 struct rpc_message *msg = &task->tk_msg;
1888 struct unlink_desc *up;
1889
1890 if (msg->rpc_resp != NULL) {
1891 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1892 update_changeattr(dir->d_inode, &up->res.cinfo);
1893 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1894 kfree(up);
1895 msg->rpc_resp = NULL;
1896 msg->rpc_argp = NULL;
1897 }
1898 return 0;
1899}
1900
1901static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1902 struct inode *new_dir, struct qstr *new_name)
1903{
1904 struct nfs_server *server = NFS_SERVER(old_dir);
1905 struct nfs4_rename_arg arg = {
1906 .old_dir = NFS_FH(old_dir),
1907 .new_dir = NFS_FH(new_dir),
1908 .old_name = old_name,
1909 .new_name = new_name,
1910 .bitmask = server->attr_bitmask,
1911 };
1912 struct nfs_fattr old_fattr, new_fattr;
1913 struct nfs4_rename_res res = {
1914 .server = server,
1915 .old_fattr = &old_fattr,
1916 .new_fattr = &new_fattr,
1917 };
1918 struct rpc_message msg = {
1919 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1920 .rpc_argp = &arg,
1921 .rpc_resp = &res,
1922 };
1923 int status;
1924
1925 nfs_fattr_init(res.old_fattr);
1926 nfs_fattr_init(res.new_fattr);
1927 status = rpc_call_sync(server->client, &msg, 0);
1928
1929 if (!status) {
1930 update_changeattr(old_dir, &res.old_cinfo);
1931 nfs_post_op_update_inode(old_dir, res.old_fattr);
1932 update_changeattr(new_dir, &res.new_cinfo);
1933 nfs_post_op_update_inode(new_dir, res.new_fattr);
1934 }
1935 return status;
1936}
1937
1938static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1939 struct inode *new_dir, struct qstr *new_name)
1940{
1941 struct nfs4_exception exception = { };
1942 int err;
1943 do {
1944 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1945 _nfs4_proc_rename(old_dir, old_name,
1946 new_dir, new_name),
1947 &exception);
1948 } while (exception.retry);
1949 return err;
1950}
1951
1952static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1953{
1954 struct nfs_server *server = NFS_SERVER(inode);
1955 struct nfs4_link_arg arg = {
1956 .fh = NFS_FH(inode),
1957 .dir_fh = NFS_FH(dir),
1958 .name = name,
1959 .bitmask = server->attr_bitmask,
1960 };
1961 struct nfs_fattr fattr, dir_attr;
1962 struct nfs4_link_res res = {
1963 .server = server,
1964 .fattr = &fattr,
1965 .dir_attr = &dir_attr,
1966 };
1967 struct rpc_message msg = {
1968 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1969 .rpc_argp = &arg,
1970 .rpc_resp = &res,
1971 };
1972 int status;
1973
1974 nfs_fattr_init(res.fattr);
1975 nfs_fattr_init(res.dir_attr);
1976 status = rpc_call_sync(server->client, &msg, 0);
1977 if (!status) {
1978 update_changeattr(dir, &res.cinfo);
1979 nfs_post_op_update_inode(dir, res.dir_attr);
1980 nfs_post_op_update_inode(inode, res.fattr);
1981 }
1982
1983 return status;
1984}
1985
1986static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1987{
1988 struct nfs4_exception exception = { };
1989 int err;
1990 do {
1991 err = nfs4_handle_exception(NFS_SERVER(inode),
1992 _nfs4_proc_link(inode, dir, name),
1993 &exception);
1994 } while (exception.retry);
1995 return err;
1996}
1997
1998static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
1999 struct page *page, unsigned int len, struct iattr *sattr)
2000{
2001 struct nfs_server *server = NFS_SERVER(dir);
2002 struct nfs_fh fhandle;
2003 struct nfs_fattr fattr, dir_fattr;
2004 struct nfs4_create_arg arg = {
2005 .dir_fh = NFS_FH(dir),
2006 .server = server,
2007 .name = &dentry->d_name,
2008 .attrs = sattr,
2009 .ftype = NF4LNK,
2010 .bitmask = server->attr_bitmask,
2011 };
2012 struct nfs4_create_res res = {
2013 .server = server,
2014 .fh = &fhandle,
2015 .fattr = &fattr,
2016 .dir_fattr = &dir_fattr,
2017 };
2018 struct rpc_message msg = {
2019 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2020 .rpc_argp = &arg,
2021 .rpc_resp = &res,
2022 };
2023 int status;
2024
2025 if (len > NFS4_MAXPATHLEN)
2026 return -ENAMETOOLONG;
2027
2028 arg.u.symlink.pages = &page;
2029 arg.u.symlink.len = len;
2030 nfs_fattr_init(&fattr);
2031 nfs_fattr_init(&dir_fattr);
2032
2033 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2034 if (!status) {
2035 update_changeattr(dir, &res.dir_cinfo);
2036 nfs_post_op_update_inode(dir, res.dir_fattr);
2037 status = nfs_instantiate(dentry, &fhandle, &fattr);
2038 }
2039 return status;
2040}
2041
2042static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2043 struct page *page, unsigned int len, struct iattr *sattr)
2044{
2045 struct nfs4_exception exception = { };
2046 int err;
2047 do {
2048 err = nfs4_handle_exception(NFS_SERVER(dir),
2049 _nfs4_proc_symlink(dir, dentry, page,
2050 len, sattr),
2051 &exception);
2052 } while (exception.retry);
2053 return err;
2054}
2055
2056static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2057 struct iattr *sattr)
2058{
2059 struct nfs_server *server = NFS_SERVER(dir);
2060 struct nfs_fh fhandle;
2061 struct nfs_fattr fattr, dir_fattr;
2062 struct nfs4_create_arg arg = {
2063 .dir_fh = NFS_FH(dir),
2064 .server = server,
2065 .name = &dentry->d_name,
2066 .attrs = sattr,
2067 .ftype = NF4DIR,
2068 .bitmask = server->attr_bitmask,
2069 };
2070 struct nfs4_create_res res = {
2071 .server = server,
2072 .fh = &fhandle,
2073 .fattr = &fattr,
2074 .dir_fattr = &dir_fattr,
2075 };
2076 struct rpc_message msg = {
2077 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2078 .rpc_argp = &arg,
2079 .rpc_resp = &res,
2080 };
2081 int status;
2082
2083 nfs_fattr_init(&fattr);
2084 nfs_fattr_init(&dir_fattr);
2085
2086 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2087 if (!status) {
2088 update_changeattr(dir, &res.dir_cinfo);
2089 nfs_post_op_update_inode(dir, res.dir_fattr);
2090 status = nfs_instantiate(dentry, &fhandle, &fattr);
2091 }
2092 return status;
2093}
2094
2095static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2096 struct iattr *sattr)
2097{
2098 struct nfs4_exception exception = { };
2099 int err;
2100 do {
2101 err = nfs4_handle_exception(NFS_SERVER(dir),
2102 _nfs4_proc_mkdir(dir, dentry, sattr),
2103 &exception);
2104 } while (exception.retry);
2105 return err;
2106}
2107
2108static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2109 u64 cookie, struct page *page, unsigned int count, int plus)
2110{
2111 struct inode *dir = dentry->d_inode;
2112 struct nfs4_readdir_arg args = {
2113 .fh = NFS_FH(dir),
2114 .pages = &page,
2115 .pgbase = 0,
2116 .count = count,
2117 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2118 };
2119 struct nfs4_readdir_res res;
2120 struct rpc_message msg = {
2121 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2122 .rpc_argp = &args,
2123 .rpc_resp = &res,
2124 .rpc_cred = cred,
2125 };
2126 int status;
2127
2128 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2129 dentry->d_parent->d_name.name,
2130 dentry->d_name.name,
2131 (unsigned long long)cookie);
2132 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2133 res.pgbase = args.pgbase;
2134 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2135 if (status == 0)
2136 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2137 dprintk("%s: returns %d\n", __FUNCTION__, status);
2138 return status;
2139}
2140
2141static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2142 u64 cookie, struct page *page, unsigned int count, int plus)
2143{
2144 struct nfs4_exception exception = { };
2145 int err;
2146 do {
2147 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2148 _nfs4_proc_readdir(dentry, cred, cookie,
2149 page, count, plus),
2150 &exception);
2151 } while (exception.retry);
2152 return err;
2153}
2154
2155static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2156 struct iattr *sattr, dev_t rdev)
2157{
2158 struct nfs_server *server = NFS_SERVER(dir);
2159 struct nfs_fh fh;
2160 struct nfs_fattr fattr, dir_fattr;
2161 struct nfs4_create_arg arg = {
2162 .dir_fh = NFS_FH(dir),
2163 .server = server,
2164 .name = &dentry->d_name,
2165 .attrs = sattr,
2166 .bitmask = server->attr_bitmask,
2167 };
2168 struct nfs4_create_res res = {
2169 .server = server,
2170 .fh = &fh,
2171 .fattr = &fattr,
2172 .dir_fattr = &dir_fattr,
2173 };
2174 struct rpc_message msg = {
2175 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2176 .rpc_argp = &arg,
2177 .rpc_resp = &res,
2178 };
2179 int status;
2180 int mode = sattr->ia_mode;
2181
2182 nfs_fattr_init(&fattr);
2183 nfs_fattr_init(&dir_fattr);
2184
2185 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2186 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2187 if (S_ISFIFO(mode))
2188 arg.ftype = NF4FIFO;
2189 else if (S_ISBLK(mode)) {
2190 arg.ftype = NF4BLK;
2191 arg.u.device.specdata1 = MAJOR(rdev);
2192 arg.u.device.specdata2 = MINOR(rdev);
2193 }
2194 else if (S_ISCHR(mode)) {
2195 arg.ftype = NF4CHR;
2196 arg.u.device.specdata1 = MAJOR(rdev);
2197 arg.u.device.specdata2 = MINOR(rdev);
2198 }
2199 else
2200 arg.ftype = NF4SOCK;
2201
2202 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2203 if (status == 0) {
2204 update_changeattr(dir, &res.dir_cinfo);
2205 nfs_post_op_update_inode(dir, res.dir_fattr);
2206 status = nfs_instantiate(dentry, &fh, &fattr);
2207 }
2208 return status;
2209}
2210
2211static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2212 struct iattr *sattr, dev_t rdev)
2213{
2214 struct nfs4_exception exception = { };
2215 int err;
2216 do {
2217 err = nfs4_handle_exception(NFS_SERVER(dir),
2218 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2219 &exception);
2220 } while (exception.retry);
2221 return err;
2222}
2223
2224static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2225 struct nfs_fsstat *fsstat)
2226{
2227 struct nfs4_statfs_arg args = {
2228 .fh = fhandle,
2229 .bitmask = server->attr_bitmask,
2230 };
2231 struct rpc_message msg = {
2232 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2233 .rpc_argp = &args,
2234 .rpc_resp = fsstat,
2235 };
2236
2237 nfs_fattr_init(fsstat->fattr);
2238 return rpc_call_sync(server->client, &msg, 0);
2239}
2240
2241static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2242{
2243 struct nfs4_exception exception = { };
2244 int err;
2245 do {
2246 err = nfs4_handle_exception(server,
2247 _nfs4_proc_statfs(server, fhandle, fsstat),
2248 &exception);
2249 } while (exception.retry);
2250 return err;
2251}
2252
2253static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2254 struct nfs_fsinfo *fsinfo)
2255{
2256 struct nfs4_fsinfo_arg args = {
2257 .fh = fhandle,
2258 .bitmask = server->attr_bitmask,
2259 };
2260 struct rpc_message msg = {
2261 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2262 .rpc_argp = &args,
2263 .rpc_resp = fsinfo,
2264 };
2265
2266 return rpc_call_sync(server->client, &msg, 0);
2267}
2268
2269static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2270{
2271 struct nfs4_exception exception = { };
2272 int err;
2273
2274 do {
2275 err = nfs4_handle_exception(server,
2276 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2277 &exception);
2278 } while (exception.retry);
2279 return err;
2280}
2281
2282static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2283{
2284 nfs_fattr_init(fsinfo->fattr);
2285 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2286}
2287
2288static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2289 struct nfs_pathconf *pathconf)
2290{
2291 struct nfs4_pathconf_arg args = {
2292 .fh = fhandle,
2293 .bitmask = server->attr_bitmask,
2294 };
2295 struct rpc_message msg = {
2296 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2297 .rpc_argp = &args,
2298 .rpc_resp = pathconf,
2299 };
2300
2301 /* None of the pathconf attributes are mandatory to implement */
2302 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2303 memset(pathconf, 0, sizeof(*pathconf));
2304 return 0;
2305 }
2306
2307 nfs_fattr_init(pathconf->fattr);
2308 return rpc_call_sync(server->client, &msg, 0);
2309}
2310
2311static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2312 struct nfs_pathconf *pathconf)
2313{
2314 struct nfs4_exception exception = { };
2315 int err;
2316
2317 do {
2318 err = nfs4_handle_exception(server,
2319 _nfs4_proc_pathconf(server, fhandle, pathconf),
2320 &exception);
2321 } while (exception.retry);
2322 return err;
2323}
2324
2325static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2326{
2327 struct nfs_server *server = NFS_SERVER(data->inode);
2328
2329 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2330 rpc_restart_call(task);
2331 return -EAGAIN;
2332 }
2333 if (task->tk_status > 0)
2334 renew_lease(server, data->timestamp);
2335 return 0;
2336}
2337
2338static void nfs4_proc_read_setup(struct nfs_read_data *data)
2339{
2340 struct rpc_message msg = {
2341 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2342 .rpc_argp = &data->args,
2343 .rpc_resp = &data->res,
2344 .rpc_cred = data->cred,
2345 };
2346
2347 data->timestamp = jiffies;
2348
2349 rpc_call_setup(&data->task, &msg, 0);
2350}
2351
2352static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2353{
2354 struct inode *inode = data->inode;
2355
2356 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2357 rpc_restart_call(task);
2358 return -EAGAIN;
2359 }
2360 if (task->tk_status >= 0) {
2361 renew_lease(NFS_SERVER(inode), data->timestamp);
2362 nfs_post_op_update_inode(inode, data->res.fattr);
2363 }
2364 return 0;
2365}
2366
2367static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2368{
2369 struct rpc_message msg = {
2370 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2371 .rpc_argp = &data->args,
2372 .rpc_resp = &data->res,
2373 .rpc_cred = data->cred,
2374 };
2375 struct inode *inode = data->inode;
2376 struct nfs_server *server = NFS_SERVER(inode);
2377 int stable;
2378
2379 if (how & FLUSH_STABLE) {
2380 if (!NFS_I(inode)->ncommit)
2381 stable = NFS_FILE_SYNC;
2382 else
2383 stable = NFS_DATA_SYNC;
2384 } else
2385 stable = NFS_UNSTABLE;
2386 data->args.stable = stable;
2387 data->args.bitmask = server->attr_bitmask;
2388 data->res.server = server;
2389
2390 data->timestamp = jiffies;
2391
2392 /* Finalize the task. */
2393 rpc_call_setup(&data->task, &msg, 0);
2394}
2395
2396static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2397{
2398 struct inode *inode = data->inode;
2399
2400 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2401 rpc_restart_call(task);
2402 return -EAGAIN;
2403 }
2404 if (task->tk_status >= 0)
2405 nfs_post_op_update_inode(inode, data->res.fattr);
2406 return 0;
2407}
2408
2409static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2410{
2411 struct rpc_message msg = {
2412 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2413 .rpc_argp = &data->args,
2414 .rpc_resp = &data->res,
2415 .rpc_cred = data->cred,
2416 };
2417 struct nfs_server *server = NFS_SERVER(data->inode);
2418
2419 data->args.bitmask = server->attr_bitmask;
2420 data->res.server = server;
2421
2422 rpc_call_setup(&data->task, &msg, 0);
2423}
2424
2425/*
2426 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2427 * standalone procedure for queueing an asynchronous RENEW.
2428 */
2429static void nfs4_renew_done(struct rpc_task *task, void *data)
2430{
2431 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2432 unsigned long timestamp = (unsigned long)data;
2433
2434 if (task->tk_status < 0) {
2435 switch (task->tk_status) {
2436 case -NFS4ERR_STALE_CLIENTID:
2437 case -NFS4ERR_EXPIRED:
2438 case -NFS4ERR_CB_PATH_DOWN:
2439 nfs4_schedule_state_recovery(clp);
2440 }
2441 return;
2442 }
2443 spin_lock(&clp->cl_lock);
2444 if (time_before(clp->cl_last_renewal,timestamp))
2445 clp->cl_last_renewal = timestamp;
2446 spin_unlock(&clp->cl_lock);
2447}
2448
2449static const struct rpc_call_ops nfs4_renew_ops = {
2450 .rpc_call_done = nfs4_renew_done,
2451};
2452
2453int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2454{
2455 struct rpc_message msg = {
2456 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2457 .rpc_argp = clp,
2458 .rpc_cred = cred,
2459 };
2460
2461 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2462 &nfs4_renew_ops, (void *)jiffies);
2463}
2464
2465int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2466{
2467 struct rpc_message msg = {
2468 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2469 .rpc_argp = clp,
2470 .rpc_cred = cred,
2471 };
2472 unsigned long now = jiffies;
2473 int status;
2474
2475 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2476 if (status < 0)
2477 return status;
2478 spin_lock(&clp->cl_lock);
2479 if (time_before(clp->cl_last_renewal,now))
2480 clp->cl_last_renewal = now;
2481 spin_unlock(&clp->cl_lock);
2482 return 0;
2483}
2484
2485static inline int nfs4_server_supports_acls(struct nfs_server *server)
2486{
2487 return (server->caps & NFS_CAP_ACLS)
2488 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2489 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2490}
2491
2492/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2493 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2494 * the stack.
2495 */
2496#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2497
2498static void buf_to_pages(const void *buf, size_t buflen,
2499 struct page **pages, unsigned int *pgbase)
2500{
2501 const void *p = buf;
2502
2503 *pgbase = offset_in_page(buf);
2504 p -= *pgbase;
2505 while (p < buf + buflen) {
2506 *(pages++) = virt_to_page(p);
2507 p += PAGE_CACHE_SIZE;
2508 }
2509}
2510
2511struct nfs4_cached_acl {
2512 int cached;
2513 size_t len;
2514 char data[0];
2515};
2516
2517static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2518{
2519 struct nfs_inode *nfsi = NFS_I(inode);
2520
2521 spin_lock(&inode->i_lock);
2522 kfree(nfsi->nfs4_acl);
2523 nfsi->nfs4_acl = acl;
2524 spin_unlock(&inode->i_lock);
2525}
2526
2527static void nfs4_zap_acl_attr(struct inode *inode)
2528{
2529 nfs4_set_cached_acl(inode, NULL);
2530}
2531
2532static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2533{
2534 struct nfs_inode *nfsi = NFS_I(inode);
2535 struct nfs4_cached_acl *acl;
2536 int ret = -ENOENT;
2537
2538 spin_lock(&inode->i_lock);
2539 acl = nfsi->nfs4_acl;
2540 if (acl == NULL)
2541 goto out;
2542 if (buf == NULL) /* user is just asking for length */
2543 goto out_len;
2544 if (acl->cached == 0)
2545 goto out;
2546 ret = -ERANGE; /* see getxattr(2) man page */
2547 if (acl->len > buflen)
2548 goto out;
2549 memcpy(buf, acl->data, acl->len);
2550out_len:
2551 ret = acl->len;
2552out:
2553 spin_unlock(&inode->i_lock);
2554 return ret;
2555}
2556
2557static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2558{
2559 struct nfs4_cached_acl *acl;
2560
2561 if (buf && acl_len <= PAGE_SIZE) {
2562 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2563 if (acl == NULL)
2564 goto out;
2565 acl->cached = 1;
2566 memcpy(acl->data, buf, acl_len);
2567 } else {
2568 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2569 if (acl == NULL)
2570 goto out;
2571 acl->cached = 0;
2572 }
2573 acl->len = acl_len;
2574out:
2575 nfs4_set_cached_acl(inode, acl);
2576}
2577
2578static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2579{
2580 struct page *pages[NFS4ACL_MAXPAGES];
2581 struct nfs_getaclargs args = {
2582 .fh = NFS_FH(inode),
2583 .acl_pages = pages,
2584 .acl_len = buflen,
2585 };
2586 size_t resp_len = buflen;
2587 void *resp_buf;
2588 struct rpc_message msg = {
2589 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2590 .rpc_argp = &args,
2591 .rpc_resp = &resp_len,
2592 };
2593 struct page *localpage = NULL;
2594 int ret;
2595
2596 if (buflen < PAGE_SIZE) {
2597 /* As long as we're doing a round trip to the server anyway,
2598 * let's be prepared for a page of acl data. */
2599 localpage = alloc_page(GFP_KERNEL);
2600 resp_buf = page_address(localpage);
2601 if (localpage == NULL)
2602 return -ENOMEM;
2603 args.acl_pages[0] = localpage;
2604 args.acl_pgbase = 0;
2605 resp_len = args.acl_len = PAGE_SIZE;
2606 } else {
2607 resp_buf = buf;
2608 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2609 }
2610 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2611 if (ret)
2612 goto out_free;
2613 if (resp_len > args.acl_len)
2614 nfs4_write_cached_acl(inode, NULL, resp_len);
2615 else
2616 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2617 if (buf) {
2618 ret = -ERANGE;
2619 if (resp_len > buflen)
2620 goto out_free;
2621 if (localpage)
2622 memcpy(buf, resp_buf, resp_len);
2623 }
2624 ret = resp_len;
2625out_free:
2626 if (localpage)
2627 __free_page(localpage);
2628 return ret;
2629}
2630
2631static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2632{
2633 struct nfs4_exception exception = { };
2634 ssize_t ret;
2635 do {
2636 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2637 if (ret >= 0)
2638 break;
2639 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2640 } while (exception.retry);
2641 return ret;
2642}
2643
2644static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2645{
2646 struct nfs_server *server = NFS_SERVER(inode);
2647 int ret;
2648
2649 if (!nfs4_server_supports_acls(server))
2650 return -EOPNOTSUPP;
2651 ret = nfs_revalidate_inode(server, inode);
2652 if (ret < 0)
2653 return ret;
2654 ret = nfs4_read_cached_acl(inode, buf, buflen);
2655 if (ret != -ENOENT)
2656 return ret;
2657 return nfs4_get_acl_uncached(inode, buf, buflen);
2658}
2659
2660static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2661{
2662 struct nfs_server *server = NFS_SERVER(inode);
2663 struct page *pages[NFS4ACL_MAXPAGES];
2664 struct nfs_setaclargs arg = {
2665 .fh = NFS_FH(inode),
2666 .acl_pages = pages,
2667 .acl_len = buflen,
2668 };
2669 struct rpc_message msg = {
2670 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2671 .rpc_argp = &arg,
2672 .rpc_resp = NULL,
2673 };
2674 int ret;
2675
2676 if (!nfs4_server_supports_acls(server))
2677 return -EOPNOTSUPP;
2678 nfs_inode_return_delegation(inode);
2679 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2680 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2681 nfs_zap_caches(inode);
2682 return ret;
2683}
2684
2685static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2686{
2687 struct nfs4_exception exception = { };
2688 int err;
2689 do {
2690 err = nfs4_handle_exception(NFS_SERVER(inode),
2691 __nfs4_proc_set_acl(inode, buf, buflen),
2692 &exception);
2693 } while (exception.retry);
2694 return err;
2695}
2696
2697static int
2698nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2699{
2700 struct nfs_client *clp = server->nfs_client;
2701
2702 if (!clp || task->tk_status >= 0)
2703 return 0;
2704 switch(task->tk_status) {
2705 case -NFS4ERR_STALE_CLIENTID:
2706 case -NFS4ERR_STALE_STATEID:
2707 case -NFS4ERR_EXPIRED:
2708 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2709 nfs4_schedule_state_recovery(clp);
2710 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2711 rpc_wake_up_task(task);
2712 task->tk_status = 0;
2713 return -EAGAIN;
2714 case -NFS4ERR_DELAY:
2715 nfs_inc_server_stats((struct nfs_server *) server,
2716 NFSIOS_DELAY);
2717 case -NFS4ERR_GRACE:
2718 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2719 task->tk_status = 0;
2720 return -EAGAIN;
2721 case -NFS4ERR_OLD_STATEID:
2722 task->tk_status = 0;
2723 return -EAGAIN;
2724 }
2725 task->tk_status = nfs4_map_errors(task->tk_status);
2726 return 0;
2727}
2728
2729static int nfs4_wait_bit_interruptible(void *word)
2730{
2731 if (signal_pending(current))
2732 return -ERESTARTSYS;
2733 schedule();
2734 return 0;
2735}
2736
2737static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2738{
2739 sigset_t oldset;
2740 int res;
2741
2742 might_sleep();
2743
2744 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2745
2746 rpc_clnt_sigmask(clnt, &oldset);
2747 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2748 nfs4_wait_bit_interruptible,
2749 TASK_INTERRUPTIBLE);
2750 rpc_clnt_sigunmask(clnt, &oldset);
2751
2752 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2753 return res;
2754}
2755
2756static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2757{
2758 sigset_t oldset;
2759 int res = 0;
2760
2761 might_sleep();
2762
2763 if (*timeout <= 0)
2764 *timeout = NFS4_POLL_RETRY_MIN;
2765 if (*timeout > NFS4_POLL_RETRY_MAX)
2766 *timeout = NFS4_POLL_RETRY_MAX;
2767 rpc_clnt_sigmask(clnt, &oldset);
2768 if (clnt->cl_intr) {
2769 schedule_timeout_interruptible(*timeout);
2770 if (signalled())
2771 res = -ERESTARTSYS;
2772 } else
2773 schedule_timeout_uninterruptible(*timeout);
2774 rpc_clnt_sigunmask(clnt, &oldset);
2775 *timeout <<= 1;
2776 return res;
2777}
2778
2779/* This is the error handling routine for processes that are allowed
2780 * to sleep.
2781 */
2782static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2783{
2784 struct nfs_client *clp = server->nfs_client;
2785 int ret = errorcode;
2786
2787 exception->retry = 0;
2788 switch(errorcode) {
2789 case 0:
2790 return 0;
2791 case -NFS4ERR_STALE_CLIENTID:
2792 case -NFS4ERR_STALE_STATEID:
2793 case -NFS4ERR_EXPIRED:
2794 nfs4_schedule_state_recovery(clp);
2795 ret = nfs4_wait_clnt_recover(server->client, clp);
2796 if (ret == 0)
2797 exception->retry = 1;
2798 break;
2799 case -NFS4ERR_FILE_OPEN:
2800 case -NFS4ERR_GRACE:
2801 case -NFS4ERR_DELAY:
2802 ret = nfs4_delay(server->client, &exception->timeout);
2803 if (ret != 0)
2804 break;
2805 case -NFS4ERR_OLD_STATEID:
2806 exception->retry = 1;
2807 }
2808 /* We failed to handle the error */
2809 return nfs4_map_errors(ret);
2810}
2811
2812int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2813{
2814 nfs4_verifier sc_verifier;
2815 struct nfs4_setclientid setclientid = {
2816 .sc_verifier = &sc_verifier,
2817 .sc_prog = program,
2818 };
2819 struct rpc_message msg = {
2820 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2821 .rpc_argp = &setclientid,
2822 .rpc_resp = clp,
2823 .rpc_cred = cred,
2824 };
2825 __be32 *p;
2826 int loop = 0;
2827 int status;
2828
2829 p = (__be32*)sc_verifier.data;
2830 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2831 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2832
2833 for(;;) {
2834 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2835 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2836 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2837 cred->cr_ops->cr_name,
2838 clp->cl_id_uniquifier);
2839 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2840 sizeof(setclientid.sc_netid), "tcp");
2841 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2842 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2843 clp->cl_ipaddr, port >> 8, port & 255);
2844
2845 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2846 if (status != -NFS4ERR_CLID_INUSE)
2847 break;
2848 if (signalled())
2849 break;
2850 if (loop++ & 1)
2851 ssleep(clp->cl_lease_time + 1);
2852 else
2853 if (++clp->cl_id_uniquifier == 0)
2854 break;
2855 }
2856 return status;
2857}
2858
2859static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2860{
2861 struct nfs_fsinfo fsinfo;
2862 struct rpc_message msg = {
2863 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2864 .rpc_argp = clp,
2865 .rpc_resp = &fsinfo,
2866 .rpc_cred = cred,
2867 };
2868 unsigned long now;
2869 int status;
2870
2871 now = jiffies;
2872 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2873 if (status == 0) {
2874 spin_lock(&clp->cl_lock);
2875 clp->cl_lease_time = fsinfo.lease_time * HZ;
2876 clp->cl_last_renewal = now;
2877 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2878 spin_unlock(&clp->cl_lock);
2879 }
2880 return status;
2881}
2882
2883int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2884{
2885 long timeout;
2886 int err;
2887 do {
2888 err = _nfs4_proc_setclientid_confirm(clp, cred);
2889 switch (err) {
2890 case 0:
2891 return err;
2892 case -NFS4ERR_RESOURCE:
2893 /* The IBM lawyers misread another document! */
2894 case -NFS4ERR_DELAY:
2895 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2896 }
2897 } while (err == 0);
2898 return err;
2899}
2900
2901struct nfs4_delegreturndata {
2902 struct nfs4_delegreturnargs args;
2903 struct nfs4_delegreturnres res;
2904 struct nfs_fh fh;
2905 nfs4_stateid stateid;
2906 struct rpc_cred *cred;
2907 unsigned long timestamp;
2908 struct nfs_fattr fattr;
2909 int rpc_status;
2910};
2911
2912static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2913{
2914 struct nfs4_delegreturndata *data = calldata;
2915 struct rpc_message msg = {
2916 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2917 .rpc_argp = &data->args,
2918 .rpc_resp = &data->res,
2919 .rpc_cred = data->cred,
2920 };
2921 nfs_fattr_init(data->res.fattr);
2922 rpc_call_setup(task, &msg, 0);
2923}
2924
2925static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2926{
2927 struct nfs4_delegreturndata *data = calldata;
2928 data->rpc_status = task->tk_status;
2929 if (data->rpc_status == 0)
2930 renew_lease(data->res.server, data->timestamp);
2931}
2932
2933static void nfs4_delegreturn_release(void *calldata)
2934{
2935 struct nfs4_delegreturndata *data = calldata;
2936
2937 put_rpccred(data->cred);
2938 kfree(calldata);
2939}
2940
2941static const struct rpc_call_ops nfs4_delegreturn_ops = {
2942 .rpc_call_prepare = nfs4_delegreturn_prepare,
2943 .rpc_call_done = nfs4_delegreturn_done,
2944 .rpc_release = nfs4_delegreturn_release,
2945};
2946
2947static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2948{
2949 struct nfs4_delegreturndata *data;
2950 struct nfs_server *server = NFS_SERVER(inode);
2951 struct rpc_task *task;
2952 int status;
2953
2954 data = kmalloc(sizeof(*data), GFP_KERNEL);
2955 if (data == NULL)
2956 return -ENOMEM;
2957 data->args.fhandle = &data->fh;
2958 data->args.stateid = &data->stateid;
2959 data->args.bitmask = server->attr_bitmask;
2960 nfs_copy_fh(&data->fh, NFS_FH(inode));
2961 memcpy(&data->stateid, stateid, sizeof(data->stateid));
2962 data->res.fattr = &data->fattr;
2963 data->res.server = server;
2964 data->cred = get_rpccred(cred);
2965 data->timestamp = jiffies;
2966 data->rpc_status = 0;
2967
2968 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2969 if (IS_ERR(task))
2970 return PTR_ERR(task);
2971 status = nfs4_wait_for_completion_rpc_task(task);
2972 if (status == 0) {
2973 status = data->rpc_status;
2974 if (status == 0)
2975 nfs_post_op_update_inode(inode, &data->fattr);
2976 }
2977 rpc_put_task(task);
2978 return status;
2979}
2980
2981int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2982{
2983 struct nfs_server *server = NFS_SERVER(inode);
2984 struct nfs4_exception exception = { };
2985 int err;
2986 do {
2987 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2988 switch (err) {
2989 case -NFS4ERR_STALE_STATEID:
2990 case -NFS4ERR_EXPIRED:
2991 case 0:
2992 return 0;
2993 }
2994 err = nfs4_handle_exception(server, err, &exception);
2995 } while (exception.retry);
2996 return err;
2997}
2998
2999#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3000#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3001
3002/*
3003 * sleep, with exponential backoff, and retry the LOCK operation.
3004 */
3005static unsigned long
3006nfs4_set_lock_task_retry(unsigned long timeout)
3007{
3008 schedule_timeout_interruptible(timeout);
3009 timeout <<= 1;
3010 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3011 return NFS4_LOCK_MAXTIMEOUT;
3012 return timeout;
3013}
3014
3015static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3016{
3017 struct inode *inode = state->inode;
3018 struct nfs_server *server = NFS_SERVER(inode);
3019 struct nfs_client *clp = server->nfs_client;
3020 struct nfs_lockt_args arg = {
3021 .fh = NFS_FH(inode),
3022 .fl = request,
3023 };
3024 struct nfs_lockt_res res = {
3025 .denied = request,
3026 };
3027 struct rpc_message msg = {
3028 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3029 .rpc_argp = &arg,
3030 .rpc_resp = &res,
3031 .rpc_cred = state->owner->so_cred,
3032 };
3033 struct nfs4_lock_state *lsp;
3034 int status;
3035
3036 down_read(&clp->cl_sem);
3037 arg.lock_owner.clientid = clp->cl_clientid;
3038 status = nfs4_set_lock_state(state, request);
3039 if (status != 0)
3040 goto out;
3041 lsp = request->fl_u.nfs4_fl.owner;
3042 arg.lock_owner.id = lsp->ls_id;
3043 status = rpc_call_sync(server->client, &msg, 0);
3044 switch (status) {
3045 case 0:
3046 request->fl_type = F_UNLCK;
3047 break;
3048 case -NFS4ERR_DENIED:
3049 status = 0;
3050 }
3051 request->fl_ops->fl_release_private(request);
3052out:
3053 up_read(&clp->cl_sem);
3054 return status;
3055}
3056
3057static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3058{
3059 struct nfs4_exception exception = { };
3060 int err;
3061
3062 do {
3063 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3064 _nfs4_proc_getlk(state, cmd, request),
3065 &exception);
3066 } while (exception.retry);
3067 return err;
3068}
3069
3070static int do_vfs_lock(struct file *file, struct file_lock *fl)
3071{
3072 int res = 0;
3073 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3074 case FL_POSIX:
3075 res = posix_lock_file_wait(file, fl);
3076 break;
3077 case FL_FLOCK:
3078 res = flock_lock_file_wait(file, fl);
3079 break;
3080 default:
3081 BUG();
3082 }
3083 return res;
3084}
3085
3086struct nfs4_unlockdata {
3087 struct nfs_locku_args arg;
3088 struct nfs_locku_res res;
3089 struct nfs4_lock_state *lsp;
3090 struct nfs_open_context *ctx;
3091 struct file_lock fl;
3092 const struct nfs_server *server;
3093 unsigned long timestamp;
3094};
3095
3096static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3097 struct nfs_open_context *ctx,
3098 struct nfs4_lock_state *lsp,
3099 struct nfs_seqid *seqid)
3100{
3101 struct nfs4_unlockdata *p;
3102 struct inode *inode = lsp->ls_state->inode;
3103
3104 p = kmalloc(sizeof(*p), GFP_KERNEL);
3105 if (p == NULL)
3106 return NULL;
3107 p->arg.fh = NFS_FH(inode);
3108 p->arg.fl = &p->fl;
3109 p->arg.seqid = seqid;
3110 p->arg.stateid = &lsp->ls_stateid;
3111 p->lsp = lsp;
3112 atomic_inc(&lsp->ls_count);
3113 /* Ensure we don't close file until we're done freeing locks! */
3114 p->ctx = get_nfs_open_context(ctx);
3115 memcpy(&p->fl, fl, sizeof(p->fl));
3116 p->server = NFS_SERVER(inode);
3117 return p;
3118}
3119
3120static void nfs4_locku_release_calldata(void *data)
3121{
3122 struct nfs4_unlockdata *calldata = data;
3123 nfs_free_seqid(calldata->arg.seqid);
3124 nfs4_put_lock_state(calldata->lsp);
3125 put_nfs_open_context(calldata->ctx);
3126 kfree(calldata);
3127}
3128
3129static void nfs4_locku_done(struct rpc_task *task, void *data)
3130{
3131 struct nfs4_unlockdata *calldata = data;
3132
3133 if (RPC_ASSASSINATED(task))
3134 return;
3135 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3136 switch (task->tk_status) {
3137 case 0:
3138 memcpy(calldata->lsp->ls_stateid.data,
3139 calldata->res.stateid.data,
3140 sizeof(calldata->lsp->ls_stateid.data));
3141 renew_lease(calldata->server, calldata->timestamp);
3142 break;
3143 case -NFS4ERR_STALE_STATEID:
3144 case -NFS4ERR_EXPIRED:
3145 break;
3146 default:
3147 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3148 rpc_restart_call(task);
3149 }
3150}
3151
3152static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3153{
3154 struct nfs4_unlockdata *calldata = data;
3155 struct rpc_message msg = {
3156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3157 .rpc_argp = &calldata->arg,
3158 .rpc_resp = &calldata->res,
3159 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
3160 };
3161
3162 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3163 return;
3164 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3165 /* Note: exit _without_ running nfs4_locku_done */
3166 task->tk_action = NULL;
3167 return;
3168 }
3169 calldata->timestamp = jiffies;
3170 rpc_call_setup(task, &msg, 0);
3171}
3172
3173static const struct rpc_call_ops nfs4_locku_ops = {
3174 .rpc_call_prepare = nfs4_locku_prepare,
3175 .rpc_call_done = nfs4_locku_done,
3176 .rpc_release = nfs4_locku_release_calldata,
3177};
3178
3179static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3180 struct nfs_open_context *ctx,
3181 struct nfs4_lock_state *lsp,
3182 struct nfs_seqid *seqid)
3183{
3184 struct nfs4_unlockdata *data;
3185
3186 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3187 if (data == NULL) {
3188 nfs_free_seqid(seqid);
3189 return ERR_PTR(-ENOMEM);
3190 }
3191
3192 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3193}
3194
3195static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3196{
3197 struct nfs_seqid *seqid;
3198 struct nfs4_lock_state *lsp;
3199 struct rpc_task *task;
3200 int status = 0;
3201
3202 status = nfs4_set_lock_state(state, request);
3203 /* Unlock _before_ we do the RPC call */
3204 request->fl_flags |= FL_EXISTS;
3205 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3206 goto out;
3207 if (status != 0)
3208 goto out;
3209 /* Is this a delegated lock? */
3210 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3211 goto out;
3212 lsp = request->fl_u.nfs4_fl.owner;
3213 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3214 status = -ENOMEM;
3215 if (seqid == NULL)
3216 goto out;
3217 task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3218 status = PTR_ERR(task);
3219 if (IS_ERR(task))
3220 goto out;
3221 status = nfs4_wait_for_completion_rpc_task(task);
3222 rpc_put_task(task);
3223out:
3224 return status;
3225}
3226
3227struct nfs4_lockdata {
3228 struct nfs_lock_args arg;
3229 struct nfs_lock_res res;
3230 struct nfs4_lock_state *lsp;
3231 struct nfs_open_context *ctx;
3232 struct file_lock fl;
3233 unsigned long timestamp;
3234 int rpc_status;
3235 int cancelled;
3236};
3237
3238static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3239 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3240{
3241 struct nfs4_lockdata *p;
3242 struct inode *inode = lsp->ls_state->inode;
3243 struct nfs_server *server = NFS_SERVER(inode);
3244
3245 p = kzalloc(sizeof(*p), GFP_KERNEL);
3246 if (p == NULL)
3247 return NULL;
3248
3249 p->arg.fh = NFS_FH(inode);
3250 p->arg.fl = &p->fl;
3251 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3252 if (p->arg.lock_seqid == NULL)
3253 goto out_free;
3254 p->arg.lock_stateid = &lsp->ls_stateid;
3255 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3256 p->arg.lock_owner.id = lsp->ls_id;
3257 p->lsp = lsp;
3258 atomic_inc(&lsp->ls_count);
3259 p->ctx = get_nfs_open_context(ctx);
3260 memcpy(&p->fl, fl, sizeof(p->fl));
3261 return p;
3262out_free:
3263 kfree(p);
3264 return NULL;
3265}
3266
3267static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3268{
3269 struct nfs4_lockdata *data = calldata;
3270 struct nfs4_state *state = data->lsp->ls_state;
3271 struct nfs4_state_owner *sp = state->owner;
3272 struct rpc_message msg = {
3273 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3274 .rpc_argp = &data->arg,
3275 .rpc_resp = &data->res,
3276 .rpc_cred = sp->so_cred,
3277 };
3278
3279 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3280 return;
3281 dprintk("%s: begin!\n", __FUNCTION__);
3282 /* Do we need to do an open_to_lock_owner? */
3283 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3284 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3285 if (data->arg.open_seqid == NULL) {
3286 data->rpc_status = -ENOMEM;
3287 task->tk_action = NULL;
3288 goto out;
3289 }
3290 data->arg.open_stateid = &state->stateid;
3291 data->arg.new_lock_owner = 1;
3292 }
3293 data->timestamp = jiffies;
3294 rpc_call_setup(task, &msg, 0);
3295out:
3296 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3297}
3298
3299static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3300{
3301 struct nfs4_lockdata *data = calldata;
3302
3303 dprintk("%s: begin!\n", __FUNCTION__);
3304
3305 data->rpc_status = task->tk_status;
3306 if (RPC_ASSASSINATED(task))
3307 goto out;
3308 if (data->arg.new_lock_owner != 0) {
3309 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3310 if (data->rpc_status == 0)
3311 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3312 else
3313 goto out;
3314 }
3315 if (data->rpc_status == 0) {
3316 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3317 sizeof(data->lsp->ls_stateid.data));
3318 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3319 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3320 }
3321 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3322out:
3323 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3324}
3325
3326static void nfs4_lock_release(void *calldata)
3327{
3328 struct nfs4_lockdata *data = calldata;
3329
3330 dprintk("%s: begin!\n", __FUNCTION__);
3331 if (data->arg.open_seqid != NULL)
3332 nfs_free_seqid(data->arg.open_seqid);
3333 if (data->cancelled != 0) {
3334 struct rpc_task *task;
3335 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3336 data->arg.lock_seqid);
3337 if (!IS_ERR(task))
3338 rpc_put_task(task);
3339 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3340 } else
3341 nfs_free_seqid(data->arg.lock_seqid);
3342 nfs4_put_lock_state(data->lsp);
3343 put_nfs_open_context(data->ctx);
3344 kfree(data);
3345 dprintk("%s: done!\n", __FUNCTION__);
3346}
3347
3348static const struct rpc_call_ops nfs4_lock_ops = {
3349 .rpc_call_prepare = nfs4_lock_prepare,
3350 .rpc_call_done = nfs4_lock_done,
3351 .rpc_release = nfs4_lock_release,
3352};
3353
3354static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3355{
3356 struct nfs4_lockdata *data;
3357 struct rpc_task *task;
3358 int ret;
3359
3360 dprintk("%s: begin!\n", __FUNCTION__);
3361 data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3362 fl->fl_u.nfs4_fl.owner);
3363 if (data == NULL)
3364 return -ENOMEM;
3365 if (IS_SETLKW(cmd))
3366 data->arg.block = 1;
3367 if (reclaim != 0)
3368 data->arg.reclaim = 1;
3369 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3370 &nfs4_lock_ops, data);
3371 if (IS_ERR(task))
3372 return PTR_ERR(task);
3373 ret = nfs4_wait_for_completion_rpc_task(task);
3374 if (ret == 0) {
3375 ret = data->rpc_status;
3376 if (ret == -NFS4ERR_DENIED)
3377 ret = -EAGAIN;
3378 } else
3379 data->cancelled = 1;
3380 rpc_put_task(task);
3381 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3382 return ret;
3383}
3384
3385static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3386{
3387 struct nfs_server *server = NFS_SERVER(state->inode);
3388 struct nfs4_exception exception = { };
3389 int err;
3390
3391 do {
3392 /* Cache the lock if possible... */
3393 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3394 return 0;
3395 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3396 if (err != -NFS4ERR_DELAY)
3397 break;
3398 nfs4_handle_exception(server, err, &exception);
3399 } while (exception.retry);
3400 return err;
3401}
3402
3403static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3404{
3405 struct nfs_server *server = NFS_SERVER(state->inode);
3406 struct nfs4_exception exception = { };
3407 int err;
3408
3409 err = nfs4_set_lock_state(state, request);
3410 if (err != 0)
3411 return err;
3412 do {
3413 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3414 return 0;
3415 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3416 if (err != -NFS4ERR_DELAY)
3417 break;
3418 nfs4_handle_exception(server, err, &exception);
3419 } while (exception.retry);
3420 return err;
3421}
3422
3423static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3424{
3425 struct nfs_client *clp = state->owner->so_client;
3426 unsigned char fl_flags = request->fl_flags;
3427 int status;
3428
3429 /* Is this a delegated open? */
3430 status = nfs4_set_lock_state(state, request);
3431 if (status != 0)
3432 goto out;
3433 request->fl_flags |= FL_ACCESS;
3434 status = do_vfs_lock(request->fl_file, request);
3435 if (status < 0)
3436 goto out;
3437 down_read(&clp->cl_sem);
3438 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3439 struct nfs_inode *nfsi = NFS_I(state->inode);
3440 /* Yes: cache locks! */
3441 down_read(&nfsi->rwsem);
3442 /* ...but avoid races with delegation recall... */
3443 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3444 request->fl_flags = fl_flags & ~FL_SLEEP;
3445 status = do_vfs_lock(request->fl_file, request);
3446 up_read(&nfsi->rwsem);
3447 goto out_unlock;
3448 }
3449 up_read(&nfsi->rwsem);
3450 }
3451 status = _nfs4_do_setlk(state, cmd, request, 0);
3452 if (status != 0)
3453 goto out_unlock;
3454 /* Note: we always want to sleep here! */
3455 request->fl_flags = fl_flags | FL_SLEEP;
3456 if (do_vfs_lock(request->fl_file, request) < 0)
3457 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3458out_unlock:
3459 up_read(&clp->cl_sem);
3460out:
3461 request->fl_flags = fl_flags;
3462 return status;
3463}
3464
3465static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3466{
3467 struct nfs4_exception exception = { };
3468 int err;
3469
3470 do {
3471 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3472 _nfs4_proc_setlk(state, cmd, request),
3473 &exception);
3474 } while (exception.retry);
3475 return err;
3476}
3477
3478static int
3479nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3480{
3481 struct nfs_open_context *ctx;
3482 struct nfs4_state *state;
3483 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3484 int status;
3485
3486 /* verify open state */
3487 ctx = (struct nfs_open_context *)filp->private_data;
3488 state = ctx->state;
3489
3490 if (request->fl_start < 0 || request->fl_end < 0)
3491 return -EINVAL;
3492
3493 if (IS_GETLK(cmd))
3494 return nfs4_proc_getlk(state, F_GETLK, request);
3495
3496 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3497 return -EINVAL;
3498
3499 if (request->fl_type == F_UNLCK)
3500 return nfs4_proc_unlck(state, cmd, request);
3501
3502 do {
3503 status = nfs4_proc_setlk(state, cmd, request);
3504 if ((status != -EAGAIN) || IS_SETLK(cmd))
3505 break;
3506 timeout = nfs4_set_lock_task_retry(timeout);
3507 status = -ERESTARTSYS;
3508 if (signalled())
3509 break;
3510 } while(status < 0);
3511 return status;
3512}
3513
3514int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3515{
3516 struct nfs_server *server = NFS_SERVER(state->inode);
3517 struct nfs4_exception exception = { };
3518 int err;
3519
3520 err = nfs4_set_lock_state(state, fl);
3521 if (err != 0)
3522 goto out;
3523 do {
3524 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3525 if (err != -NFS4ERR_DELAY)
3526 break;
3527 err = nfs4_handle_exception(server, err, &exception);
3528 } while (exception.retry);
3529out:
3530 return err;
3531}
3532
3533#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3534
3535int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3536 size_t buflen, int flags)
3537{
3538 struct inode *inode = dentry->d_inode;
3539
3540 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3541 return -EOPNOTSUPP;
3542
3543 if (!S_ISREG(inode->i_mode) &&
3544 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3545 return -EPERM;
3546
3547 return nfs4_proc_set_acl(inode, buf, buflen);
3548}
3549
3550/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3551 * and that's what we'll do for e.g. user attributes that haven't been set.
3552 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3553 * attributes in kernel-managed attribute namespaces. */
3554ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3555 size_t buflen)
3556{
3557 struct inode *inode = dentry->d_inode;
3558
3559 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3560 return -EOPNOTSUPP;
3561
3562 return nfs4_proc_get_acl(inode, buf, buflen);
3563}
3564
3565ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3566{
3567 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3568
3569 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3570 return 0;
3571 if (buf && buflen < len)
3572 return -ERANGE;
3573 if (buf)
3574 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3575 return len;
3576}
3577
3578int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3579 struct nfs4_fs_locations *fs_locations, struct page *page)
3580{
3581 struct nfs_server *server = NFS_SERVER(dir);
3582 u32 bitmask[2] = {
3583 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3584 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3585 };
3586 struct nfs4_fs_locations_arg args = {
3587 .dir_fh = NFS_FH(dir),
3588 .name = name,
3589 .page = page,
3590 .bitmask = bitmask,
3591 };
3592 struct rpc_message msg = {
3593 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3594 .rpc_argp = &args,
3595 .rpc_resp = fs_locations,
3596 };
3597 int status;
3598
3599 dprintk("%s: start\n", __FUNCTION__);
3600 nfs_fattr_init(&fs_locations->fattr);
3601 fs_locations->server = server;
3602 fs_locations->nlocations = 0;
3603 status = rpc_call_sync(server->client, &msg, 0);
3604 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3605 return status;
3606}
3607
3608struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3609 .recover_open = nfs4_open_reclaim,
3610 .recover_lock = nfs4_lock_reclaim,
3611};
3612
3613struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3614 .recover_open = nfs4_open_expired,
3615 .recover_lock = nfs4_lock_expired,
3616};
3617
3618static const struct inode_operations nfs4_file_inode_operations = {
3619 .permission = nfs_permission,
3620 .getattr = nfs_getattr,
3621 .setattr = nfs_setattr,
3622 .getxattr = nfs4_getxattr,
3623 .setxattr = nfs4_setxattr,
3624 .listxattr = nfs4_listxattr,
3625};
3626
3627const struct nfs_rpc_ops nfs_v4_clientops = {
3628 .version = 4, /* protocol version */
3629 .dentry_ops = &nfs4_dentry_operations,
3630 .dir_inode_ops = &nfs4_dir_inode_operations,
3631 .file_inode_ops = &nfs4_file_inode_operations,
3632 .getroot = nfs4_proc_get_root,
3633 .getattr = nfs4_proc_getattr,
3634 .setattr = nfs4_proc_setattr,
3635 .lookupfh = nfs4_proc_lookupfh,
3636 .lookup = nfs4_proc_lookup,
3637 .access = nfs4_proc_access,
3638 .readlink = nfs4_proc_readlink,
3639 .create = nfs4_proc_create,
3640 .remove = nfs4_proc_remove,
3641 .unlink_setup = nfs4_proc_unlink_setup,
3642 .unlink_done = nfs4_proc_unlink_done,
3643 .rename = nfs4_proc_rename,
3644 .link = nfs4_proc_link,
3645 .symlink = nfs4_proc_symlink,
3646 .mkdir = nfs4_proc_mkdir,
3647 .rmdir = nfs4_proc_remove,
3648 .readdir = nfs4_proc_readdir,
3649 .mknod = nfs4_proc_mknod,
3650 .statfs = nfs4_proc_statfs,
3651 .fsinfo = nfs4_proc_fsinfo,
3652 .pathconf = nfs4_proc_pathconf,
3653 .set_capabilities = nfs4_server_capabilities,
3654 .decode_dirent = nfs4_decode_dirent,
3655 .read_setup = nfs4_proc_read_setup,
3656 .read_done = nfs4_read_done,
3657 .write_setup = nfs4_proc_write_setup,
3658 .write_done = nfs4_write_done,
3659 .commit_setup = nfs4_proc_commit_setup,
3660 .commit_done = nfs4_commit_done,
3661 .file_open = nfs_open,
3662 .file_release = nfs_release,
3663 .lock = nfs4_proc_lock,
3664 .clear_acl_cache = nfs4_zap_acl_attr,
3665};
3666
3667/*
3668 * Local variables:
3669 * c-basic-offset: 8
3670 * End:
3671 */
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