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[PATCH] NFS: Clean up readdir changes.
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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1da177e4
LT		 1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
50
4ce79717 51#include "nfs4_fs.h"
1da177e4
LT		 52#include "delegation.h"
53
54#define NFSDBG_FACILITY NFSDBG_PROC
55
56#define NFS4_POLL_RETRY_MIN (1*HZ)
57#define NFS4_POLL_RETRY_MAX (15*HZ)
58
59static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
60static int nfs4_async_handle_error(struct rpc_task *, struct nfs_server *);
61static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
62static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
63extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
64extern struct rpc_procinfo nfs4_procedures[];
65
1da177e4
LT		 66/* Prevent leaks of NFSv4 errors into userland */
67int nfs4_map_errors(int err)
68{
69 if (err < -1000) {
70 dprintk("%s could not handle NFSv4 error %d\n",
71 __FUNCTION__, -err);
72 return -EIO;
73 }
74 return err;
75}
76
77/*
78 * This is our standard bitmap for GETATTR requests.
79 */
80const u32 nfs4_fattr_bitmap[2] = {
81 FATTR4_WORD0_TYPE
82 | FATTR4_WORD0_CHANGE
83 | FATTR4_WORD0_SIZE
84 | FATTR4_WORD0_FSID
85 | FATTR4_WORD0_FILEID,
86 FATTR4_WORD1_MODE
87 | FATTR4_WORD1_NUMLINKS
88 | FATTR4_WORD1_OWNER
89 | FATTR4_WORD1_OWNER_GROUP
90 | FATTR4_WORD1_RAWDEV
91 | FATTR4_WORD1_SPACE_USED
92 | FATTR4_WORD1_TIME_ACCESS
93 | FATTR4_WORD1_TIME_METADATA
94 | FATTR4_WORD1_TIME_MODIFY
95};
96
97const u32 nfs4_statfs_bitmap[2] = {
98 FATTR4_WORD0_FILES_AVAIL
99 | FATTR4_WORD0_FILES_FREE
100 | FATTR4_WORD0_FILES_TOTAL,
101 FATTR4_WORD1_SPACE_AVAIL
102 | FATTR4_WORD1_SPACE_FREE
103 | FATTR4_WORD1_SPACE_TOTAL
104};
105
4ce79717 106const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 107 FATTR4_WORD0_MAXLINK
108 | FATTR4_WORD0_MAXNAME,
109 0
110};
111
112const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
113 | FATTR4_WORD0_MAXREAD
114 | FATTR4_WORD0_MAXWRITE
115 | FATTR4_WORD0_LEASE_TIME,
116 0
117};
118
119static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
120 struct nfs4_readdir_arg *readdir)
121{
122 u32 *start, *p;
123
124 BUG_ON(readdir->count < 80);
125 if (cookie > 2) {
b7ef1956 126 readdir->cookie = cookie;
1da177e4
LT		 127 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
128 return;
129 }
130
131 readdir->cookie = 0;
132 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
133 if (cookie == 2)
134 return;
135
136 /*
137 * NFSv4 servers do not return entries for '.' and '..'
138 * Therefore, we fake these entries here. We let '.'
139 * have cookie 0 and '..' have cookie 1. Note that
140 * when talking to the server, we always send cookie 0
141 * instead of 1 or 2.
142 */
143 start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
144
145 if (cookie == 0) {
146 *p++ = xdr_one; /* next */
147 *p++ = xdr_zero; /* cookie, first word */
148 *p++ = xdr_one; /* cookie, second word */
149 *p++ = xdr_one; /* entry len */
150 memcpy(p, ".\0\0\0", 4); /* entry */
151 p++;
152 *p++ = xdr_one; /* bitmap length */
153 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
154 *p++ = htonl(8); /* attribute buffer length */
155 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
156 }
157
158 *p++ = xdr_one; /* next */
159 *p++ = xdr_zero; /* cookie, first word */
160 *p++ = xdr_two; /* cookie, second word */
161 *p++ = xdr_two; /* entry len */
162 memcpy(p, "..\0\0", 4); /* entry */
163 p++;
164 *p++ = xdr_one; /* bitmap length */
165 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
166 *p++ = htonl(8); /* attribute buffer length */
167 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
168
169 readdir->pgbase = (char *)p - (char *)start;
170 readdir->count -= readdir->pgbase;
171 kunmap_atomic(start, KM_USER0);
172}
173
174static void
175renew_lease(struct nfs_server *server, unsigned long timestamp)
176{
177 struct nfs4_client *clp = server->nfs4_state;
178 spin_lock(&clp->cl_lock);
179 if (time_before(clp->cl_last_renewal,timestamp))
180 clp->cl_last_renewal = timestamp;
181 spin_unlock(&clp->cl_lock);
182}
183
184static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
185{
186 struct nfs_inode *nfsi = NFS_I(inode);
187
188 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
189 nfsi->change_attr = cinfo->after;
190}
191
192static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
193{
194 struct inode *inode = state->inode;
195
196 open_flags &= (FMODE_READ|FMODE_WRITE);
197 /* Protect against nfs4_find_state() */
198 spin_lock(&inode->i_lock);
199 state->state |= open_flags;
200 /* NB! List reordering - see the reclaim code for why. */
201 if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
202 list_move(&state->open_states, &state->owner->so_states);
203 if (open_flags & FMODE_READ)
204 state->nreaders++;
205 memcpy(&state->stateid, stateid, sizeof(state->stateid));
206 spin_unlock(&inode->i_lock);
207}
208
209/*
210 * OPEN_RECLAIM:
211 * reclaim state on the server after a reboot.
212 * Assumes caller is holding the sp->so_sem
213 */
214static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
215{
216 struct inode *inode = state->inode;
217 struct nfs_server *server = NFS_SERVER(inode);
218 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
219 struct nfs_openargs o_arg = {
220 .fh = NFS_FH(inode),
221 .seqid = sp->so_seqid,
222 .id = sp->so_id,
223 .open_flags = state->state,
224 .clientid = server->nfs4_state->cl_clientid,
225 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
226 .bitmask = server->attr_bitmask,
227 };
228 struct nfs_openres o_res = {
229 .server = server, /* Grrr */
230 };
231 struct rpc_message msg = {
232 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
233 .rpc_argp = &o_arg,
234 .rpc_resp = &o_res,
235 .rpc_cred = sp->so_cred,
236 };
237 int status;
238
239 if (delegation != NULL) {
240 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
241 memcpy(&state->stateid, &delegation->stateid,
242 sizeof(state->stateid));
243 set_bit(NFS_DELEGATED_STATE, &state->flags);
244 return 0;
245 }
246 o_arg.u.delegation_type = delegation->type;
247 }
248 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
249 nfs4_increment_seqid(status, sp);
250 if (status == 0) {
251 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
252 if (o_res.delegation_type != 0) {
253 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
254 /* Did the server issue an immediate delegation recall? */
255 if (o_res.do_recall)
256 nfs_async_inode_return_delegation(inode, &o_res.stateid);
257 }
258 }
259 clear_bit(NFS_DELEGATED_STATE, &state->flags);
260 /* Ensure we update the inode attributes */
261 NFS_CACHEINV(inode);
262 return status;
263}
264
265static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
266{
267 struct nfs_server *server = NFS_SERVER(state->inode);
268 struct nfs4_exception exception = { };
269 int err;
270 do {
271 err = _nfs4_open_reclaim(sp, state);
272 switch (err) {
273 case 0:
274 case -NFS4ERR_STALE_CLIENTID:
275 case -NFS4ERR_STALE_STATEID:
276 case -NFS4ERR_EXPIRED:
277 return err;
278 }
279 err = nfs4_handle_exception(server, err, &exception);
280 } while (exception.retry);
281 return err;
282}
283
284static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
285{
286 struct nfs4_state_owner *sp = state->owner;
287 struct inode *inode = dentry->d_inode;
288 struct nfs_server *server = NFS_SERVER(inode);
289 struct dentry *parent = dget_parent(dentry);
290 struct nfs_openargs arg = {
291 .fh = NFS_FH(parent->d_inode),
292 .clientid = server->nfs4_state->cl_clientid,
293 .name = &dentry->d_name,
294 .id = sp->so_id,
295 .server = server,
296 .bitmask = server->attr_bitmask,
297 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
298 };
299 struct nfs_openres res = {
300 .server = server,
301 };
302 struct rpc_message msg = {
303 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
304 .rpc_argp = &arg,
305 .rpc_resp = &res,
306 .rpc_cred = sp->so_cred,
307 };
308 int status = 0;
309
310 down(&sp->so_sema);
311 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
312 goto out;
313 if (state->state == 0)
314 goto out;
315 arg.seqid = sp->so_seqid;
316 arg.open_flags = state->state;
317 memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
318 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
319 nfs4_increment_seqid(status, sp);
320 if (status >= 0) {
321 memcpy(state->stateid.data, res.stateid.data,
322 sizeof(state->stateid.data));
323 clear_bit(NFS_DELEGATED_STATE, &state->flags);
324 }
325out:
326 up(&sp->so_sema);
327 dput(parent);
328 return status;
329}
330
331int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
332{
333 struct nfs4_exception exception = { };
334 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
335 int err;
336 do {
337 err = _nfs4_open_delegation_recall(dentry, state);
338 switch (err) {
339 case 0:
340 return err;
341 case -NFS4ERR_STALE_CLIENTID:
342 case -NFS4ERR_STALE_STATEID:
343 case -NFS4ERR_EXPIRED:
344 /* Don't recall a delegation if it was lost */
345 nfs4_schedule_state_recovery(server->nfs4_state);
346 return err;
347 }
348 err = nfs4_handle_exception(server, err, &exception);
349 } while (exception.retry);
350 return err;
351}
352
353static inline int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid)
354{
355 struct nfs_open_confirmargs arg = {
356 .fh = fh,
357 .seqid = sp->so_seqid,
358 .stateid = *stateid,
359 };
360 struct nfs_open_confirmres res;
361 struct rpc_message msg = {
362 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
363 .rpc_argp = &arg,
364 .rpc_resp = &res,
365 .rpc_cred = sp->so_cred,
366 };
367 int status;
368
369 status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
370 nfs4_increment_seqid(status, sp);
371 if (status >= 0)
372 memcpy(stateid, &res.stateid, sizeof(*stateid));
373 return status;
374}
375
376static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
377{
378 struct nfs_server *server = NFS_SERVER(dir);
379 struct rpc_message msg = {
380 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
381 .rpc_argp = o_arg,
382 .rpc_resp = o_res,
383 .rpc_cred = sp->so_cred,
384 };
385 int status;
386
387 /* Update sequence id. The caller must serialize! */
388 o_arg->seqid = sp->so_seqid;
389 o_arg->id = sp->so_id;
390 o_arg->clientid = sp->so_client->cl_clientid;
391
392 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
393 nfs4_increment_seqid(status, sp);
394 if (status != 0)
395 goto out;
396 update_changeattr(dir, &o_res->cinfo);
397 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
398 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
399 sp, &o_res->stateid);
400 if (status != 0)
401 goto out;
402 }
403 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
404 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
405out:
406 return status;
407}
408
409static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
410{
411 struct nfs_access_entry cache;
412 int mask = 0;
413 int status;
414
415 if (openflags & FMODE_READ)
416 mask |= MAY_READ;
417 if (openflags & FMODE_WRITE)
418 mask |= MAY_WRITE;
419 status = nfs_access_get_cached(inode, cred, &cache);
420 if (status == 0)
421 goto out;
422
423 /* Be clever: ask server to check for all possible rights */
424 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
425 cache.cred = cred;
426 cache.jiffies = jiffies;
427 status = _nfs4_proc_access(inode, &cache);
428 if (status != 0)
429 return status;
430 nfs_access_add_cache(inode, &cache);
431out:
432 if ((cache.mask & mask) == mask)
433 return 0;
434 return -EACCES;
435}
436
437/*
438 * OPEN_EXPIRED:
439 * reclaim state on the server after a network partition.
440 * Assumes caller holds the appropriate lock
441 */
442static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
443{
444 struct dentry *parent = dget_parent(dentry);
445 struct inode *dir = parent->d_inode;
446 struct inode *inode = state->inode;
447 struct nfs_server *server = NFS_SERVER(dir);
448 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
449 struct nfs_fattr f_attr = {
450 .valid = 0,
451 };
452 struct nfs_openargs o_arg = {
453 .fh = NFS_FH(dir),
454 .open_flags = state->state,
455 .name = &dentry->d_name,
456 .bitmask = server->attr_bitmask,
457 .claim = NFS4_OPEN_CLAIM_NULL,
458 };
459 struct nfs_openres o_res = {
460 .f_attr = &f_attr,
461 .server = server,
462 };
463 int status = 0;
464
465 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
466 status = _nfs4_do_access(inode, sp->so_cred, state->state);
467 if (status < 0)
468 goto out;
469 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
470 set_bit(NFS_DELEGATED_STATE, &state->flags);
471 goto out;
472 }
473 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
474 if (status != 0)
475 goto out_nodeleg;
476 /* Check if files differ */
477 if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
478 goto out_stale;
479 /* Has the file handle changed? */
480 if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
481 /* Verify if the change attributes are the same */
482 if (f_attr.change_attr != NFS_I(inode)->change_attr)
483 goto out_stale;
484 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
485 goto out_stale;
486 /* Lets just pretend that this is the same file */
487 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
488 NFS_I(inode)->fileid = f_attr.fileid;
489 }
490 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
491 if (o_res.delegation_type != 0) {
492 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
493 nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
494 else
495 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
496 }
497out_nodeleg:
498 clear_bit(NFS_DELEGATED_STATE, &state->flags);
499out:
500 dput(parent);
501 return status;
502out_stale:
503 status = -ESTALE;
504 /* Invalidate the state owner so we don't ever use it again */
505 nfs4_drop_state_owner(sp);
506 d_drop(dentry);
507 /* Should we be trying to close that stateid? */
508 goto out_nodeleg;
509}
510
511static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
512{
513 struct nfs_inode *nfsi = NFS_I(state->inode);
514 struct nfs_open_context *ctx;
515 int status;
516
517 spin_lock(&state->inode->i_lock);
518 list_for_each_entry(ctx, &nfsi->open_files, list) {
519 if (ctx->state != state)
520 continue;
521 get_nfs_open_context(ctx);
522 spin_unlock(&state->inode->i_lock);
523 status = _nfs4_open_expired(sp, state, ctx->dentry);
524 put_nfs_open_context(ctx);
525 return status;
526 }
527 spin_unlock(&state->inode->i_lock);
528 return -ENOENT;
529}
530
531/*
532 * Returns an nfs4_state + an extra reference to the inode
533 */
534static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
535{
536 struct nfs_delegation *delegation;
537 struct nfs_server *server = NFS_SERVER(inode);
538 struct nfs4_client *clp = server->nfs4_state;
539 struct nfs_inode *nfsi = NFS_I(inode);
540 struct nfs4_state_owner *sp = NULL;
541 struct nfs4_state *state = NULL;
542 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
543 int err;
544
545 /* Protect against reboot recovery - NOTE ORDER! */
546 down_read(&clp->cl_sem);
547 /* Protect against delegation recall */
548 down_read(&nfsi->rwsem);
549 delegation = NFS_I(inode)->delegation;
550 err = -ENOENT;
551 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
552 goto out_err;
553 err = -ENOMEM;
554 if (!(sp = nfs4_get_state_owner(server, cred))) {
555 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
556 goto out_err;
557 }
558 down(&sp->so_sema);
559 state = nfs4_get_open_state(inode, sp);
560 if (state == NULL)
561 goto out_err;
562
563 err = -ENOENT;
564 if ((state->state & open_flags) == open_flags) {
565 spin_lock(&inode->i_lock);
566 if (open_flags & FMODE_READ)
567 state->nreaders++;
568 if (open_flags & FMODE_WRITE)
569 state->nwriters++;
570 spin_unlock(&inode->i_lock);
571 goto out_ok;
572 } else if (state->state != 0)
573 goto out_err;
574
575 lock_kernel();
576 err = _nfs4_do_access(inode, cred, open_flags);
577 unlock_kernel();
578 if (err != 0)
579 goto out_err;
580 set_bit(NFS_DELEGATED_STATE, &state->flags);
581 update_open_stateid(state, &delegation->stateid, open_flags);
582out_ok:
583 up(&sp->so_sema);
584 nfs4_put_state_owner(sp);
585 up_read(&nfsi->rwsem);
586 up_read(&clp->cl_sem);
587 igrab(inode);
588 *res = state;
589 return 0;
590out_err:
591 if (sp != NULL) {
592 if (state != NULL)
593 nfs4_put_open_state(state);
594 up(&sp->so_sema);
595 nfs4_put_state_owner(sp);
596 }
597 up_read(&nfsi->rwsem);
598 up_read(&clp->cl_sem);
599 return err;
600}
601
602static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
603{
604 struct nfs4_exception exception = { };
605 struct nfs4_state *res;
606 int err;
607
608 do {
609 err = _nfs4_open_delegated(inode, flags, cred, &res);
610 if (err == 0)
611 break;
612 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
613 err, &exception));
614 } while (exception.retry);
615 return res;
616}
617
618/*
619 * Returns an nfs4_state + an referenced inode
620 */
621static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
622{
623 struct nfs4_state_owner *sp;
624 struct nfs4_state *state = NULL;
625 struct nfs_server *server = NFS_SERVER(dir);
626 struct nfs4_client *clp = server->nfs4_state;
627 struct inode *inode = NULL;
628 int status;
629 struct nfs_fattr f_attr = {
630 .valid = 0,
631 };
632 struct nfs_openargs o_arg = {
633 .fh = NFS_FH(dir),
634 .open_flags = flags,
635 .name = &dentry->d_name,
636 .server = server,
637 .bitmask = server->attr_bitmask,
638 .claim = NFS4_OPEN_CLAIM_NULL,
639 };
640 struct nfs_openres o_res = {
641 .f_attr = &f_attr,
642 .server = server,
643 };
644
645 /* Protect against reboot recovery conflicts */
646 down_read(&clp->cl_sem);
647 status = -ENOMEM;
648 if (!(sp = nfs4_get_state_owner(server, cred))) {
649 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
650 goto out_err;
651 }
652 if (flags & O_EXCL) {
653 u32 *p = (u32 *) o_arg.u.verifier.data;
654 p[0] = jiffies;
655 p[1] = current->pid;
656 } else
657 o_arg.u.attrs = sattr;
658 /* Serialization for the sequence id */
659 down(&sp->so_sema);
660
661 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
662 if (status != 0)
663 goto out_err;
664
665 status = -ENOMEM;
666 inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
667 if (!inode)
668 goto out_err;
669 state = nfs4_get_open_state(inode, sp);
670 if (!state)
671 goto out_err;
672 update_open_stateid(state, &o_res.stateid, flags);
673 if (o_res.delegation_type != 0)
674 nfs_inode_set_delegation(inode, cred, &o_res);
675 up(&sp->so_sema);
676 nfs4_put_state_owner(sp);
677 up_read(&clp->cl_sem);
678 *res = state;
679 return 0;
680out_err:
681 if (sp != NULL) {
682 if (state != NULL)
683 nfs4_put_open_state(state);
684 up(&sp->so_sema);
685 nfs4_put_state_owner(sp);
686 }
687 /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
688 up_read(&clp->cl_sem);
689 if (inode != NULL)
690 iput(inode);
691 *res = NULL;
692 return status;
693}
694
695
696static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
697{
698 struct nfs4_exception exception = { };
699 struct nfs4_state *res;
700 int status;
701
702 do {
703 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
704 if (status == 0)
705 break;
706 /* NOTE: BAD_SEQID means the server and client disagree about the
707 * book-keeping w.r.t. state-changing operations
708 * (OPEN/CLOSE/LOCK/LOCKU...)
709 * It is actually a sign of a bug on the client or on the server.
710 *
711 * If we receive a BAD_SEQID error in the particular case of
712 * doing an OPEN, we assume that nfs4_increment_seqid() will
713 * have unhashed the old state_owner for us, and that we can
714 * therefore safely retry using a new one. We should still warn
715 * the user though...
716 */
717 if (status == -NFS4ERR_BAD_SEQID) {
718 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
719 exception.retry = 1;
720 continue;
721 }
722 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
723 status, &exception));
724 } while (exception.retry);
725 return res;
726}
727
728static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
729 struct nfs_fh *fhandle, struct iattr *sattr,
730 struct nfs4_state *state)
731{
732 struct nfs_setattrargs arg = {
733 .fh = fhandle,
734 .iap = sattr,
735 .server = server,
736 .bitmask = server->attr_bitmask,
737 };
738 struct nfs_setattrres res = {
739 .fattr = fattr,
740 .server = server,
741 };
742 struct rpc_message msg = {
743 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
744 .rpc_argp = &arg,
745 .rpc_resp = &res,
746 };
747
748 fattr->valid = 0;
749
750 if (state != NULL)
751 msg.rpc_cred = state->owner->so_cred;
752 if (sattr->ia_valid & ATTR_SIZE)
753 nfs4_copy_stateid(&arg.stateid, state, NULL);
754 else
755 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
756
757 return rpc_call_sync(server->client, &msg, 0);
758}
759
760static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
761 struct nfs_fh *fhandle, struct iattr *sattr,
762 struct nfs4_state *state)
763{
764 struct nfs4_exception exception = { };
765 int err;
766 do {
767 err = nfs4_handle_exception(server,
768 _nfs4_do_setattr(server, fattr, fhandle, sattr,
769 state),
770 &exception);
771 } while (exception.retry);
772 return err;
773}
774
775struct nfs4_closedata {
776 struct inode *inode;
777 struct nfs4_state *state;
778 struct nfs_closeargs arg;
779 struct nfs_closeres res;
780};
781
782static void nfs4_close_done(struct rpc_task *task)
783{
784 struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
785 struct nfs4_state *state = calldata->state;
786 struct nfs4_state_owner *sp = state->owner;
787 struct nfs_server *server = NFS_SERVER(calldata->inode);
788
789 /* hmm. we are done with the inode, and in the process of freeing
790 * the state_owner. we keep this around to process errors
791 */
792 nfs4_increment_seqid(task->tk_status, sp);
793 switch (task->tk_status) {
794 case 0:
795 memcpy(&state->stateid, &calldata->res.stateid,
796 sizeof(state->stateid));
797 break;
798 case -NFS4ERR_STALE_STATEID:
799 case -NFS4ERR_EXPIRED:
800 state->state = calldata->arg.open_flags;
801 nfs4_schedule_state_recovery(server->nfs4_state);
802 break;
803 default:
804 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
805 rpc_restart_call(task);
806 return;
807 }
808 }
809 state->state = calldata->arg.open_flags;
810 nfs4_put_open_state(state);
811 up(&sp->so_sema);
812 nfs4_put_state_owner(sp);
813 up_read(&server->nfs4_state->cl_sem);
814 kfree(calldata);
815}
816
817static inline int nfs4_close_call(struct rpc_clnt *clnt, struct nfs4_closedata *calldata)
818{
819 struct rpc_message msg = {
820 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
821 .rpc_argp = &calldata->arg,
822 .rpc_resp = &calldata->res,
823 .rpc_cred = calldata->state->owner->so_cred,
824 };
825 if (calldata->arg.open_flags != 0)
826 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
827 return rpc_call_async(clnt, &msg, 0, nfs4_close_done, calldata);
828}
829
830/*
831 * It is possible for data to be read/written from a mem-mapped file
832 * after the sys_close call (which hits the vfs layer as a flush).
833 * This means that we can't safely call nfsv4 close on a file until
834 * the inode is cleared. This in turn means that we are not good
835 * NFSv4 citizens - we do not indicate to the server to update the file's
836 * share state even when we are done with one of the three share
837 * stateid's in the inode.
838 *
839 * NOTE: Caller must be holding the sp->so_owner semaphore!
840 */
841int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
842{
843 struct nfs4_closedata *calldata;
844 int status;
845
846 /* Tell caller we're done */
847 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
848 state->state = mode;
849 return 0;
850 }
851 calldata = (struct nfs4_closedata *)kmalloc(sizeof(*calldata), GFP_KERNEL);
852 if (calldata == NULL)
853 return -ENOMEM;
854 calldata->inode = inode;
855 calldata->state = state;
856 calldata->arg.fh = NFS_FH(inode);
857 /* Serialization for the sequence id */
858 calldata->arg.seqid = state->owner->so_seqid;
859 calldata->arg.open_flags = mode;
860 memcpy(&calldata->arg.stateid, &state->stateid,
861 sizeof(calldata->arg.stateid));
862 status = nfs4_close_call(NFS_SERVER(inode)->client, calldata);
863 /*
864 * Return -EINPROGRESS on success in order to indicate to the
865 * caller that an asynchronous RPC call has been launched, and
866 * that it will release the semaphores on completion.
867 */
868 return (status == 0) ? -EINPROGRESS : status;
869}
870
871struct inode *
872nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
873{
874 struct iattr attr;
875 struct rpc_cred *cred;
876 struct nfs4_state *state;
877
878 if (nd->flags & LOOKUP_CREATE) {
879 attr.ia_mode = nd->intent.open.create_mode;
880 attr.ia_valid = ATTR_MODE;
881 if (!IS_POSIXACL(dir))
882 attr.ia_mode &= ~current->fs->umask;
883 } else {
884 attr.ia_valid = 0;
885 BUG_ON(nd->intent.open.flags & O_CREAT);
886 }
887
888 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
889 if (IS_ERR(cred))
890 return (struct inode *)cred;
891 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
892 put_rpccred(cred);
893 if (IS_ERR(state))
894 return (struct inode *)state;
895 return state->inode;
896}
897
898int
899nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags)
900{
901 struct rpc_cred *cred;
902 struct nfs4_state *state;
903 struct inode *inode;
904
905 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
906 if (IS_ERR(cred))
907 return PTR_ERR(cred);
908 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
909 if (IS_ERR(state))
910 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
911 put_rpccred(cred);
912 if (state == ERR_PTR(-ENOENT) && dentry->d_inode == 0)
913 return 1;
914 if (IS_ERR(state))
915 return 0;
916 inode = state->inode;
917 if (inode == dentry->d_inode) {
918 iput(inode);
919 return 1;
920 }
921 d_drop(dentry);
922 nfs4_close_state(state, openflags);
923 iput(inode);
924 return 0;
925}
926
927
928static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
929{
930 struct nfs4_server_caps_res res = {};
931 struct rpc_message msg = {
932 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
933 .rpc_argp = fhandle,
934 .rpc_resp = &res,
935 };
936 int status;
937
938 status = rpc_call_sync(server->client, &msg, 0);
939 if (status == 0) {
940 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
941 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
942 server->caps |= NFS_CAP_ACLS;
943 if (res.has_links != 0)
944 server->caps |= NFS_CAP_HARDLINKS;
945 if (res.has_symlinks != 0)
946 server->caps |= NFS_CAP_SYMLINKS;
947 server->acl_bitmask = res.acl_bitmask;
948 }
949 return status;
950}
951
952static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
953{
954 struct nfs4_exception exception = { };
955 int err;
956 do {
957 err = nfs4_handle_exception(server,
958 _nfs4_server_capabilities(server, fhandle),
959 &exception);
960 } while (exception.retry);
961 return err;
962}
963
964static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
965 struct nfs_fsinfo *info)
966{
967 struct nfs_fattr * fattr = info->fattr;
968 struct nfs4_lookup_root_arg args = {
969 .bitmask = nfs4_fattr_bitmap,
970 };
971 struct nfs4_lookup_res res = {
972 .server = server,
973 .fattr = fattr,
974 .fh = fhandle,
975 };
976 struct rpc_message msg = {
977 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
978 .rpc_argp = &args,
979 .rpc_resp = &res,
980 };
981 fattr->valid = 0;
982 return rpc_call_sync(server->client, &msg, 0);
983}
984
985static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
986 struct nfs_fsinfo *info)
987{
988 struct nfs4_exception exception = { };
989 int err;
990 do {
991 err = nfs4_handle_exception(server,
992 _nfs4_lookup_root(server, fhandle, info),
993 &exception);
994 } while (exception.retry);
995 return err;
996}
997
998static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
999 struct nfs_fsinfo *info)
1000{
1001 struct nfs_fattr * fattr = info->fattr;
1002 unsigned char * p;
1003 struct qstr q;
1004 struct nfs4_lookup_arg args = {
1005 .dir_fh = fhandle,
1006 .name = &q,
1007 .bitmask = nfs4_fattr_bitmap,
1008 };
1009 struct nfs4_lookup_res res = {
1010 .server = server,
1011 .fattr = fattr,
1012 .fh = fhandle,
1013 };
1014 struct rpc_message msg = {
1015 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1016 .rpc_argp = &args,
1017 .rpc_resp = &res,
1018 };
1019 int status;
1020
1021 /*
1022 * Now we do a separate LOOKUP for each component of the mount path.
1023 * The LOOKUPs are done separately so that we can conveniently
1024 * catch an ERR_WRONGSEC if it occurs along the way...
1025 */
1026 status = nfs4_lookup_root(server, fhandle, info);
1027 if (status)
1028 goto out;
1029
1030 p = server->mnt_path;
1031 for (;;) {
1032 struct nfs4_exception exception = { };
1033
1034 while (*p == '/')
1035 p++;
1036 if (!*p)
1037 break;
1038 q.name = p;
1039 while (*p && (*p != '/'))
1040 p++;
1041 q.len = p - q.name;
1042
1043 do {
1044 fattr->valid = 0;
1045 status = nfs4_handle_exception(server,
1046 rpc_call_sync(server->client, &msg, 0),
1047 &exception);
1048 } while (exception.retry);
1049 if (status == 0)
1050 continue;
1051 if (status == -ENOENT) {
1052 printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1053 printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1054 }
1055 break;
1056 }
1057 if (status == 0)
1058 status = nfs4_server_capabilities(server, fhandle);
1059 if (status == 0)
1060 status = nfs4_do_fsinfo(server, fhandle, info);
1061out:
1062 return status;
1063}
1064
1065static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1066{
1067 struct nfs4_getattr_arg args = {
1068 .fh = fhandle,
1069 .bitmask = server->attr_bitmask,
1070 };
1071 struct nfs4_getattr_res res = {
1072 .fattr = fattr,
1073 .server = server,
1074 };
1075 struct rpc_message msg = {
1076 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1077 .rpc_argp = &args,
1078 .rpc_resp = &res,
1079 };
1080
1081 fattr->valid = 0;
1082 return rpc_call_sync(server->client, &msg, 0);
1083}
1084
1085static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1086{
1087 struct nfs4_exception exception = { };
1088 int err;
1089 do {
1090 err = nfs4_handle_exception(server,
1091 _nfs4_proc_getattr(server, fhandle, fattr),
1092 &exception);
1093 } while (exception.retry);
1094 return err;
1095}
1096
1097/*
1098 * The file is not closed if it is opened due to the a request to change
1099 * the size of the file. The open call will not be needed once the
1100 * VFS layer lookup-intents are implemented.
1101 *
1102 * Close is called when the inode is destroyed.
1103 * If we haven't opened the file for O_WRONLY, we
1104 * need to in the size_change case to obtain a stateid.
1105 *
1106 * Got race?
1107 * Because OPEN is always done by name in nfsv4, it is
1108 * possible that we opened a different file by the same
1109 * name. We can recognize this race condition, but we
1110 * can't do anything about it besides returning an error.
1111 *
1112 * This will be fixed with VFS changes (lookup-intent).
1113 */
1114static int
1115nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1116 struct iattr *sattr)
1117{
1118 struct inode * inode = dentry->d_inode;
1119 int size_change = sattr->ia_valid & ATTR_SIZE;
1120 struct nfs4_state *state = NULL;
1121 int need_iput = 0;
1122 int status;
1123
1124 fattr->valid = 0;
1125
1126 if (size_change) {
1127 struct rpc_cred *cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1128 if (IS_ERR(cred))
1129 return PTR_ERR(cred);
1130 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1131 if (state == NULL) {
1132 state = nfs4_open_delegated(dentry->d_inode,
1133 FMODE_WRITE, cred);
1134 if (IS_ERR(state))
1135 state = nfs4_do_open(dentry->d_parent->d_inode,
1136 dentry, FMODE_WRITE,
1137 NULL, cred);
1138 need_iput = 1;
1139 }
1140 put_rpccred(cred);
1141 if (IS_ERR(state))
1142 return PTR_ERR(state);
1143
1144 if (state->inode != inode) {
1145 printk(KERN_WARNING "nfs: raced in setattr (%p != %p), returning -EIO\n", inode, state->inode);
1146 status = -EIO;
1147 goto out;
1148 }
1149 }
1150 status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1151 NFS_FH(inode), sattr, state);
1152out:
1153 if (state) {
1154 inode = state->inode;
1155 nfs4_close_state(state, FMODE_WRITE);
1156 if (need_iput)
1157 iput(inode);
1158 }
1159 return status;
1160}
1161
1162static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1163 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1164{
1165 int status;
1166 struct nfs_server *server = NFS_SERVER(dir);
1167 struct nfs4_lookup_arg args = {
1168 .bitmask = server->attr_bitmask,
1169 .dir_fh = NFS_FH(dir),
1170 .name = name,
1171 };
1172 struct nfs4_lookup_res res = {
1173 .server = server,
1174 .fattr = fattr,
1175 .fh = fhandle,
1176 };
1177 struct rpc_message msg = {
1178 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1179 .rpc_argp = &args,
1180 .rpc_resp = &res,
1181 };
1182
1183 fattr->valid = 0;
1184
1185 dprintk("NFS call lookup %s\n", name->name);
1186 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1187 dprintk("NFS reply lookup: %d\n", status);
1188 return status;
1189}
1190
1191static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1192{
1193 struct nfs4_exception exception = { };
1194 int err;
1195 do {
1196 err = nfs4_handle_exception(NFS_SERVER(dir),
1197 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1198 &exception);
1199 } while (exception.retry);
1200 return err;
1201}
1202
1203static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1204{
1205 struct nfs4_accessargs args = {
1206 .fh = NFS_FH(inode),
1207 };
1208 struct nfs4_accessres res = { 0 };
1209 struct rpc_message msg = {
1210 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1211 .rpc_argp = &args,
1212 .rpc_resp = &res,
1213 .rpc_cred = entry->cred,
1214 };
1215 int mode = entry->mask;
1216 int status;
1217
1218 /*
1219 * Determine which access bits we want to ask for...
1220 */
1221 if (mode & MAY_READ)
1222 args.access |= NFS4_ACCESS_READ;
1223 if (S_ISDIR(inode->i_mode)) {
1224 if (mode & MAY_WRITE)
1225 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1226 if (mode & MAY_EXEC)
1227 args.access |= NFS4_ACCESS_LOOKUP;
1228 } else {
1229 if (mode & MAY_WRITE)
1230 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1231 if (mode & MAY_EXEC)
1232 args.access |= NFS4_ACCESS_EXECUTE;
1233 }
1234 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1235 if (!status) {
1236 entry->mask = 0;
1237 if (res.access & NFS4_ACCESS_READ)
1238 entry->mask |= MAY_READ;
1239 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1240 entry->mask |= MAY_WRITE;
1241 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1242 entry->mask |= MAY_EXEC;
1243 }
1244 return status;
1245}
1246
1247static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1248{
1249 struct nfs4_exception exception = { };
1250 int err;
1251 do {
1252 err = nfs4_handle_exception(NFS_SERVER(inode),
1253 _nfs4_proc_access(inode, entry),
1254 &exception);
1255 } while (exception.retry);
1256 return err;
1257}
1258
1259/*
1260 * TODO: For the time being, we don't try to get any attributes
1261 * along with any of the zero-copy operations READ, READDIR,
1262 * READLINK, WRITE.
1263 *
1264 * In the case of the first three, we want to put the GETATTR
1265 * after the read-type operation -- this is because it is hard
1266 * to predict the length of a GETATTR response in v4, and thus
1267 * align the READ data correctly. This means that the GETATTR
1268 * may end up partially falling into the page cache, and we should
1269 * shift it into the 'tail' of the xdr_buf before processing.
1270 * To do this efficiently, we need to know the total length
1271 * of data received, which doesn't seem to be available outside
1272 * of the RPC layer.
1273 *
1274 * In the case of WRITE, we also want to put the GETATTR after
1275 * the operation -- in this case because we want to make sure
1276 * we get the post-operation mtime and size. This means that
1277 * we can't use xdr_encode_pages() as written: we need a variant
1278 * of it which would leave room in the 'tail' iovec.
1279 *
1280 * Both of these changes to the XDR layer would in fact be quite
1281 * minor, but I decided to leave them for a subsequent patch.
1282 */
1283static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1284 unsigned int pgbase, unsigned int pglen)
1285{
1286 struct nfs4_readlink args = {
1287 .fh = NFS_FH(inode),
1288 .pgbase = pgbase,
1289 .pglen = pglen,
1290 .pages = &page,
1291 };
1292 struct rpc_message msg = {
1293 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1294 .rpc_argp = &args,
1295 .rpc_resp = NULL,
1296 };
1297
1298 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1299}
1300
1301static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1302 unsigned int pgbase, unsigned int pglen)
1303{
1304 struct nfs4_exception exception = { };
1305 int err;
1306 do {
1307 err = nfs4_handle_exception(NFS_SERVER(inode),
1308 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1309 &exception);
1310 } while (exception.retry);
1311 return err;
1312}
1313
1314static int _nfs4_proc_read(struct nfs_read_data *rdata)
1315{
1316 int flags = rdata->flags;
1317 struct inode *inode = rdata->inode;
1318 struct nfs_fattr *fattr = rdata->res.fattr;
1319 struct nfs_server *server = NFS_SERVER(inode);
1320 struct rpc_message msg = {
1321 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1322 .rpc_argp = &rdata->args,
1323 .rpc_resp = &rdata->res,
1324 .rpc_cred = rdata->cred,
1325 };
1326 unsigned long timestamp = jiffies;
1327 int status;
1328
1329 dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
1330 (long long) rdata->args.offset);
1331
1332 fattr->valid = 0;
1333 status = rpc_call_sync(server->client, &msg, flags);
1334 if (!status)
1335 renew_lease(server, timestamp);
1336 dprintk("NFS reply read: %d\n", status);
1337 return status;
1338}
1339
1340static int nfs4_proc_read(struct nfs_read_data *rdata)
1341{
1342 struct nfs4_exception exception = { };
1343 int err;
1344 do {
1345 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1346 _nfs4_proc_read(rdata),
1347 &exception);
1348 } while (exception.retry);
1349 return err;
1350}
1351
1352static int _nfs4_proc_write(struct nfs_write_data *wdata)
1353{
1354 int rpcflags = wdata->flags;
1355 struct inode *inode = wdata->inode;
1356 struct nfs_fattr *fattr = wdata->res.fattr;
1357 struct nfs_server *server = NFS_SERVER(inode);
1358 struct rpc_message msg = {
1359 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1360 .rpc_argp = &wdata->args,
1361 .rpc_resp = &wdata->res,
1362 .rpc_cred = wdata->cred,
1363 };
1364 int status;
1365
1366 dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
1367 (long long) wdata->args.offset);
1368
1369 fattr->valid = 0;
1370 status = rpc_call_sync(server->client, &msg, rpcflags);
1371 dprintk("NFS reply write: %d\n", status);
1372 return status;
1373}
1374
1375static int nfs4_proc_write(struct nfs_write_data *wdata)
1376{
1377 struct nfs4_exception exception = { };
1378 int err;
1379 do {
1380 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1381 _nfs4_proc_write(wdata),
1382 &exception);
1383 } while (exception.retry);
1384 return err;
1385}
1386
1387static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1388{
1389 struct inode *inode = cdata->inode;
1390 struct nfs_fattr *fattr = cdata->res.fattr;
1391 struct nfs_server *server = NFS_SERVER(inode);
1392 struct rpc_message msg = {
1393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1394 .rpc_argp = &cdata->args,
1395 .rpc_resp = &cdata->res,
1396 .rpc_cred = cdata->cred,
1397 };
1398 int status;
1399
1400 dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
1401 (long long) cdata->args.offset);
1402
1403 fattr->valid = 0;
1404 status = rpc_call_sync(server->client, &msg, 0);
1405 dprintk("NFS reply commit: %d\n", status);
1406 return status;
1407}
1408
1409static int nfs4_proc_commit(struct nfs_write_data *cdata)
1410{
1411 struct nfs4_exception exception = { };
1412 int err;
1413 do {
1414 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1415 _nfs4_proc_commit(cdata),
1416 &exception);
1417 } while (exception.retry);
1418 return err;
1419}
1420
1421/*
1422 * Got race?
1423 * We will need to arrange for the VFS layer to provide an atomic open.
1424 * Until then, this create/open method is prone to inefficiency and race
1425 * conditions due to the lookup, create, and open VFS calls from sys_open()
1426 * placed on the wire.
1427 *
1428 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1429 * The file will be opened again in the subsequent VFS open call
1430 * (nfs4_proc_file_open).
1431 *
1432 * The open for read will just hang around to be used by any process that
1433 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1434 */
1435
1436static int
1437nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1438 int flags)
1439{
1440 struct nfs4_state *state;
1441 struct rpc_cred *cred;
1442 int status = 0;
1443
1444 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1445 if (IS_ERR(cred)) {
1446 status = PTR_ERR(cred);
1447 goto out;
1448 }
1449 state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1450 put_rpccred(cred);
1451 if (IS_ERR(state)) {
1452 status = PTR_ERR(state);
1453 goto out;
1454 }
1455 d_instantiate(dentry, state->inode);
1456 if (flags & O_EXCL) {
1457 struct nfs_fattr fattr;
1458 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1459 NFS_FH(state->inode), sattr, state);
1460 if (status == 0)
1461 goto out;
1462 } else if (flags != 0)
1463 goto out;
1464 nfs4_close_state(state, flags);
1465out:
1466 return status;
1467}
1468
1469static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1470{
1471 struct nfs4_remove_arg args = {
1472 .fh = NFS_FH(dir),
1473 .name = name,
1474 };
1475 struct nfs4_change_info res;
1476 struct rpc_message msg = {
1477 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1478 .rpc_argp = &args,
1479 .rpc_resp = &res,
1480 };
1481 int status;
1482
1483 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1484 if (status == 0)
1485 update_changeattr(dir, &res);
1486 return status;
1487}
1488
1489static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1490{
1491 struct nfs4_exception exception = { };
1492 int err;
1493 do {
1494 err = nfs4_handle_exception(NFS_SERVER(dir),
1495 _nfs4_proc_remove(dir, name),
1496 &exception);
1497 } while (exception.retry);
1498 return err;
1499}
1500
1501struct unlink_desc {
1502 struct nfs4_remove_arg args;
1503 struct nfs4_change_info res;
1504};
1505
1506static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1507 struct qstr *name)
1508{
1509 struct unlink_desc *up;
1510
1511 up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1512 if (!up)
1513 return -ENOMEM;
1514
1515 up->args.fh = NFS_FH(dir->d_inode);
1516 up->args.name = name;
1517
1518 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1519 msg->rpc_argp = &up->args;
1520 msg->rpc_resp = &up->res;
1521 return 0;
1522}
1523
1524static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1525{
1526 struct rpc_message *msg = &task->tk_msg;
1527 struct unlink_desc *up;
1528
1529 if (msg->rpc_resp != NULL) {
1530 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1531 update_changeattr(dir->d_inode, &up->res);
1532 kfree(up);
1533 msg->rpc_resp = NULL;
1534 msg->rpc_argp = NULL;
1535 }
1536 return 0;
1537}
1538
1539static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1540 struct inode *new_dir, struct qstr *new_name)
1541{
1542 struct nfs4_rename_arg arg = {
1543 .old_dir = NFS_FH(old_dir),
1544 .new_dir = NFS_FH(new_dir),
1545 .old_name = old_name,
1546 .new_name = new_name,
1547 };
1548 struct nfs4_rename_res res = { };
1549 struct rpc_message msg = {
1550 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1551 .rpc_argp = &arg,
1552 .rpc_resp = &res,
1553 };
1554 int status;
1555
1556 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1557
1558 if (!status) {
1559 update_changeattr(old_dir, &res.old_cinfo);
1560 update_changeattr(new_dir, &res.new_cinfo);
1561 }
1562 return status;
1563}
1564
1565static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1566 struct inode *new_dir, struct qstr *new_name)
1567{
1568 struct nfs4_exception exception = { };
1569 int err;
1570 do {
1571 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1572 _nfs4_proc_rename(old_dir, old_name,
1573 new_dir, new_name),
1574 &exception);
1575 } while (exception.retry);
1576 return err;
1577}
1578
1579static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1580{
1581 struct nfs4_link_arg arg = {
1582 .fh = NFS_FH(inode),
1583 .dir_fh = NFS_FH(dir),
1584 .name = name,
1585 };
1586 struct nfs4_change_info cinfo = { };
1587 struct rpc_message msg = {
1588 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1589 .rpc_argp = &arg,
1590 .rpc_resp = &cinfo,
1591 };
1592 int status;
1593
1594 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1595 if (!status)
1596 update_changeattr(dir, &cinfo);
1597
1598 return status;
1599}
1600
1601static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1602{
1603 struct nfs4_exception exception = { };
1604 int err;
1605 do {
1606 err = nfs4_handle_exception(NFS_SERVER(inode),
1607 _nfs4_proc_link(inode, dir, name),
1608 &exception);
1609 } while (exception.retry);
1610 return err;
1611}
1612
1613static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1614 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1615 struct nfs_fattr *fattr)
1616{
1617 struct nfs_server *server = NFS_SERVER(dir);
1618 struct nfs4_create_arg arg = {
1619 .dir_fh = NFS_FH(dir),
1620 .server = server,
1621 .name = name,
1622 .attrs = sattr,
1623 .ftype = NF4LNK,
1624 .bitmask = server->attr_bitmask,
1625 };
1626 struct nfs4_create_res res = {
1627 .server = server,
1628 .fh = fhandle,
1629 .fattr = fattr,
1630 };
1631 struct rpc_message msg = {
1632 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1633 .rpc_argp = &arg,
1634 .rpc_resp = &res,
1635 };
1636 int status;
1637
1638 if (path->len > NFS4_MAXPATHLEN)
1639 return -ENAMETOOLONG;
1640 arg.u.symlink = path;
1641 fattr->valid = 0;
1642
1643 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1644 if (!status)
1645 update_changeattr(dir, &res.dir_cinfo);
1646 return status;
1647}
1648
1649static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1650 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1651 struct nfs_fattr *fattr)
1652{
1653 struct nfs4_exception exception = { };
1654 int err;
1655 do {
1656 err = nfs4_handle_exception(NFS_SERVER(dir),
1657 _nfs4_proc_symlink(dir, name, path, sattr,
1658 fhandle, fattr),
1659 &exception);
1660 } while (exception.retry);
1661 return err;
1662}
1663
1664static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1665 struct iattr *sattr)
1666{
1667 struct nfs_server *server = NFS_SERVER(dir);
1668 struct nfs_fh fhandle;
1669 struct nfs_fattr fattr;
1670 struct nfs4_create_arg arg = {
1671 .dir_fh = NFS_FH(dir),
1672 .server = server,
1673 .name = &dentry->d_name,
1674 .attrs = sattr,
1675 .ftype = NF4DIR,
1676 .bitmask = server->attr_bitmask,
1677 };
1678 struct nfs4_create_res res = {
1679 .server = server,
1680 .fh = &fhandle,
1681 .fattr = &fattr,
1682 };
1683 struct rpc_message msg = {
1684 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1685 .rpc_argp = &arg,
1686 .rpc_resp = &res,
1687 };
1688 int status;
1689
1690 fattr.valid = 0;
1691
1692 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1693 if (!status) {
1694 update_changeattr(dir, &res.dir_cinfo);
1695 status = nfs_instantiate(dentry, &fhandle, &fattr);
1696 }
1697 return status;
1698}
1699
1700static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1701 struct iattr *sattr)
1702{
1703 struct nfs4_exception exception = { };
1704 int err;
1705 do {
1706 err = nfs4_handle_exception(NFS_SERVER(dir),
1707 _nfs4_proc_mkdir(dir, dentry, sattr),
1708 &exception);
1709 } while (exception.retry);
1710 return err;
1711}
1712
1713static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1714 u64 cookie, struct page *page, unsigned int count, int plus)
1715{
1716 struct inode *dir = dentry->d_inode;
1717 struct nfs4_readdir_arg args = {
1718 .fh = NFS_FH(dir),
1719 .pages = &page,
1720 .pgbase = 0,
1721 .count = count,
1722 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1723 };
1724 struct nfs4_readdir_res res;
1725 struct rpc_message msg = {
1726 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1727 .rpc_argp = &args,
1728 .rpc_resp = &res,
1729 .rpc_cred = cred,
1730 };
1731 int status;
1732
1733 lock_kernel();
1734 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1735 res.pgbase = args.pgbase;
1736 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1737 if (status == 0)
1738 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1739 unlock_kernel();
1740 return status;
1741}
1742
1743static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1744 u64 cookie, struct page *page, unsigned int count, int plus)
1745{
1746 struct nfs4_exception exception = { };
1747 int err;
1748 do {
1749 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1750 _nfs4_proc_readdir(dentry, cred, cookie,
1751 page, count, plus),
1752 &exception);
1753 } while (exception.retry);
1754 return err;
1755}
1756
1757static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1758 struct iattr *sattr, dev_t rdev)
1759{
1760 struct nfs_server *server = NFS_SERVER(dir);
1761 struct nfs_fh fh;
1762 struct nfs_fattr fattr;
1763 struct nfs4_create_arg arg = {
1764 .dir_fh = NFS_FH(dir),
1765 .server = server,
1766 .name = &dentry->d_name,
1767 .attrs = sattr,
1768 .bitmask = server->attr_bitmask,
1769 };
1770 struct nfs4_create_res res = {
1771 .server = server,
1772 .fh = &fh,
1773 .fattr = &fattr,
1774 };
1775 struct rpc_message msg = {
1776 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1777 .rpc_argp = &arg,
1778 .rpc_resp = &res,
1779 };
1780 int status;
1781 int mode = sattr->ia_mode;
1782
1783 fattr.valid = 0;
1784
1785 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1786 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1787 if (S_ISFIFO(mode))
1788 arg.ftype = NF4FIFO;
1789 else if (S_ISBLK(mode)) {
1790 arg.ftype = NF4BLK;
1791 arg.u.device.specdata1 = MAJOR(rdev);
1792 arg.u.device.specdata2 = MINOR(rdev);
1793 }
1794 else if (S_ISCHR(mode)) {
1795 arg.ftype = NF4CHR;
1796 arg.u.device.specdata1 = MAJOR(rdev);
1797 arg.u.device.specdata2 = MINOR(rdev);
1798 }
1799 else
1800 arg.ftype = NF4SOCK;
1801
1802 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1803 if (status == 0) {
1804 update_changeattr(dir, &res.dir_cinfo);
1805 status = nfs_instantiate(dentry, &fh, &fattr);
1806 }
1807 return status;
1808}
1809
1810static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1811 struct iattr *sattr, dev_t rdev)
1812{
1813 struct nfs4_exception exception = { };
1814 int err;
1815 do {
1816 err = nfs4_handle_exception(NFS_SERVER(dir),
1817 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
1818 &exception);
1819 } while (exception.retry);
1820 return err;
1821}
1822
1823static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1824 struct nfs_fsstat *fsstat)
1825{
1826 struct nfs4_statfs_arg args = {
1827 .fh = fhandle,
1828 .bitmask = server->attr_bitmask,
1829 };
1830 struct rpc_message msg = {
1831 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1832 .rpc_argp = &args,
1833 .rpc_resp = fsstat,
1834 };
1835
1836 fsstat->fattr->valid = 0;
1837 return rpc_call_sync(server->client, &msg, 0);
1838}
1839
1840static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1841{
1842 struct nfs4_exception exception = { };
1843 int err;
1844 do {
1845 err = nfs4_handle_exception(server,
1846 _nfs4_proc_statfs(server, fhandle, fsstat),
1847 &exception);
1848 } while (exception.retry);
1849 return err;
1850}
1851
1852static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
1853 struct nfs_fsinfo *fsinfo)
1854{
1855 struct nfs4_fsinfo_arg args = {
1856 .fh = fhandle,
1857 .bitmask = server->attr_bitmask,
1858 };
1859 struct rpc_message msg = {
1860 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
1861 .rpc_argp = &args,
1862 .rpc_resp = fsinfo,
1863 };
1864
1865 return rpc_call_sync(server->client, &msg, 0);
1866}
1867
1868static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
1869{
1870 struct nfs4_exception exception = { };
1871 int err;
1872
1873 do {
1874 err = nfs4_handle_exception(server,
1875 _nfs4_do_fsinfo(server, fhandle, fsinfo),
1876 &exception);
1877 } while (exception.retry);
1878 return err;
1879}
1880
1881static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
1882{
1883 fsinfo->fattr->valid = 0;
1884 return nfs4_do_fsinfo(server, fhandle, fsinfo);
1885}
1886
1887static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
1888 struct nfs_pathconf *pathconf)
1889{
1890 struct nfs4_pathconf_arg args = {
1891 .fh = fhandle,
1892 .bitmask = server->attr_bitmask,
1893 };
1894 struct rpc_message msg = {
1895 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
1896 .rpc_argp = &args,
1897 .rpc_resp = pathconf,
1898 };
1899
1900 /* None of the pathconf attributes are mandatory to implement */
1901 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
1902 memset(pathconf, 0, sizeof(*pathconf));
1903 return 0;
1904 }
1905
1906 pathconf->fattr->valid = 0;
1907 return rpc_call_sync(server->client, &msg, 0);
1908}
1909
1910static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
1911 struct nfs_pathconf *pathconf)
1912{
1913 struct nfs4_exception exception = { };
1914 int err;
1915
1916 do {
1917 err = nfs4_handle_exception(server,
1918 _nfs4_proc_pathconf(server, fhandle, pathconf),
1919 &exception);
1920 } while (exception.retry);
1921 return err;
1922}
1923
1924static void
1925nfs4_read_done(struct rpc_task *task)
1926{
1927 struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
1928 struct inode *inode = data->inode;
1929
1930 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
1931 rpc_restart_call(task);
1932 return;
1933 }
1934 if (task->tk_status > 0)
1935 renew_lease(NFS_SERVER(inode), data->timestamp);
1936 /* Call back common NFS readpage processing */
1937 nfs_readpage_result(task);
1938}
1939
1940static void
1941nfs4_proc_read_setup(struct nfs_read_data *data)
1942{
1943 struct rpc_task *task = &data->task;
1944 struct rpc_message msg = {
1945 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1946 .rpc_argp = &data->args,
1947 .rpc_resp = &data->res,
1948 .rpc_cred = data->cred,
1949 };
1950 struct inode *inode = data->inode;
1951 int flags;
1952
1953 data->timestamp = jiffies;
1954
1955 /* N.B. Do we need to test? Never called for swapfile inode */
1956 flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
1957
1958 /* Finalize the task. */
1959 rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
1960 rpc_call_setup(task, &msg, 0);
1961}
1962
1963static void
1964nfs4_write_done(struct rpc_task *task)
1965{
1966 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
1967 struct inode *inode = data->inode;
1968
1969 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
1970 rpc_restart_call(task);
1971 return;
1972 }
1973 if (task->tk_status >= 0)
1974 renew_lease(NFS_SERVER(inode), data->timestamp);
1975 /* Call back common NFS writeback processing */
1976 nfs_writeback_done(task);
1977}
1978
1979static void
1980nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1981{
1982 struct rpc_task *task = &data->task;
1983 struct rpc_message msg = {
1984 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1985 .rpc_argp = &data->args,
1986 .rpc_resp = &data->res,
1987 .rpc_cred = data->cred,
1988 };
1989 struct inode *inode = data->inode;
1990 int stable;
1991 int flags;
1992
1993 if (how & FLUSH_STABLE) {
1994 if (!NFS_I(inode)->ncommit)
1995 stable = NFS_FILE_SYNC;
1996 else
1997 stable = NFS_DATA_SYNC;
1998 } else
1999 stable = NFS_UNSTABLE;
2000 data->args.stable = stable;
2001
2002 data->timestamp = jiffies;
2003
2004 /* Set the initial flags for the task. */
2005 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2006
2007 /* Finalize the task. */
2008 rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2009 rpc_call_setup(task, &msg, 0);
2010}
2011
2012static void
2013nfs4_commit_done(struct rpc_task *task)
2014{
2015 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2016 struct inode *inode = data->inode;
2017
2018 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2019 rpc_restart_call(task);
2020 return;
2021 }
2022 /* Call back common NFS writeback processing */
2023 nfs_commit_done(task);
2024}
2025
2026static void
2027nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2028{
2029 struct rpc_task *task = &data->task;
2030 struct rpc_message msg = {
2031 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2032 .rpc_argp = &data->args,
2033 .rpc_resp = &data->res,
2034 .rpc_cred = data->cred,
2035 };
2036 struct inode *inode = data->inode;
2037 int flags;
2038
2039 /* Set the initial flags for the task. */
2040 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2041
2042 /* Finalize the task. */
2043 rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2044 rpc_call_setup(task, &msg, 0);
2045}
2046
2047/*
2048 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2049 * standalone procedure for queueing an asynchronous RENEW.
2050 */
2051static void
2052renew_done(struct rpc_task *task)
2053{
2054 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2055 unsigned long timestamp = (unsigned long)task->tk_calldata;
2056
2057 if (task->tk_status < 0) {
2058 switch (task->tk_status) {
2059 case -NFS4ERR_STALE_CLIENTID:
2060 case -NFS4ERR_EXPIRED:
2061 case -NFS4ERR_CB_PATH_DOWN:
2062 nfs4_schedule_state_recovery(clp);
2063 }
2064 return;
2065 }
2066 spin_lock(&clp->cl_lock);
2067 if (time_before(clp->cl_last_renewal,timestamp))
2068 clp->cl_last_renewal = timestamp;
2069 spin_unlock(&clp->cl_lock);
2070}
2071
2072int
2073nfs4_proc_async_renew(struct nfs4_client *clp)
2074{
2075 struct rpc_message msg = {
2076 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2077 .rpc_argp = clp,
2078 .rpc_cred = clp->cl_cred,
2079 };
2080
2081 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2082 renew_done, (void *)jiffies);
2083}
2084
2085int
2086nfs4_proc_renew(struct nfs4_client *clp)
2087{
2088 struct rpc_message msg = {
2089 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2090 .rpc_argp = clp,
2091 .rpc_cred = clp->cl_cred,
2092 };
2093 unsigned long now = jiffies;
2094 int status;
2095
2096 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2097 if (status < 0)
2098 return status;
2099 spin_lock(&clp->cl_lock);
2100 if (time_before(clp->cl_last_renewal,now))
2101 clp->cl_last_renewal = now;
2102 spin_unlock(&clp->cl_lock);
2103 return 0;
2104}
2105
2106/*
2107 * We will need to arrange for the VFS layer to provide an atomic open.
2108 * Until then, this open method is prone to inefficiency and race conditions
2109 * due to the lookup, potential create, and open VFS calls from sys_open()
2110 * placed on the wire.
2111 */
2112static int
2113nfs4_proc_file_open(struct inode *inode, struct file *filp)
2114{
2115 struct dentry *dentry = filp->f_dentry;
2116 struct nfs_open_context *ctx;
2117 struct nfs4_state *state = NULL;
2118 struct rpc_cred *cred;
2119 int status = -ENOMEM;
2120
2121 dprintk("nfs4_proc_file_open: starting on (%.*s/%.*s)\n",
2122 (int)dentry->d_parent->d_name.len,
2123 dentry->d_parent->d_name.name,
2124 (int)dentry->d_name.len, dentry->d_name.name);
2125
2126
2127 /* Find our open stateid */
2128 cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
2129 if (IS_ERR(cred))
2130 return PTR_ERR(cred);
2131 ctx = alloc_nfs_open_context(dentry, cred);
2132 put_rpccred(cred);
2133 if (unlikely(ctx == NULL))
2134 return -ENOMEM;
2135 status = -EIO; /* ERACE actually */
2136 state = nfs4_find_state(inode, cred, filp->f_mode);
2137 if (unlikely(state == NULL))
2138 goto no_state;
2139 ctx->state = state;
2140 nfs4_close_state(state, filp->f_mode);
2141 ctx->mode = filp->f_mode;
2142 nfs_file_set_open_context(filp, ctx);
2143 put_nfs_open_context(ctx);
2144 if (filp->f_mode & FMODE_WRITE)
2145 nfs_begin_data_update(inode);
2146 return 0;
2147no_state:
2148 printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__);
2149 put_nfs_open_context(ctx);
2150 return status;
2151}
2152
2153/*
2154 * Release our state
2155 */
2156static int
2157nfs4_proc_file_release(struct inode *inode, struct file *filp)
2158{
2159 if (filp->f_mode & FMODE_WRITE)
2160 nfs_end_data_update(inode);
2161 nfs_file_clear_open_context(filp);
2162 return 0;
2163}
2164
aa1870af
BF		 2165static inline int nfs4_server_supports_acls(struct nfs_server *server)
2166{
2167 return (server->caps & NFS_CAP_ACLS)
2168 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2169 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2170}
2171
2172/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2173 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2174 * the stack.
2175 */
2176#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2177
2178static void buf_to_pages(const void *buf, size_t buflen,
2179 struct page **pages, unsigned int *pgbase)
2180{
2181 const void *p = buf;
2182
2183 *pgbase = offset_in_page(buf);
2184 p -= *pgbase;
2185 while (p < buf + buflen) {
2186 *(pages++) = virt_to_page(p);
2187 p += PAGE_CACHE_SIZE;
2188 }
2189}
2190
e50a1c2e
BF		 2191struct nfs4_cached_acl {
2192 int cached;
2193 size_t len;
3e9d4154 2194 char data[0];
e50a1c2e
BF		 2195};
2196
2197static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2198{
2199 struct nfs_inode *nfsi = NFS_I(inode);
2200
2201 spin_lock(&inode->i_lock);
2202 kfree(nfsi->nfs4_acl);
2203 nfsi->nfs4_acl = acl;
2204 spin_unlock(&inode->i_lock);
2205}
2206
2207static void nfs4_zap_acl_attr(struct inode *inode)
2208{
2209 nfs4_set_cached_acl(inode, NULL);
2210}
2211
2212static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2213{
2214 struct nfs_inode *nfsi = NFS_I(inode);
2215 struct nfs4_cached_acl *acl;
2216 int ret = -ENOENT;
2217
2218 spin_lock(&inode->i_lock);
2219 acl = nfsi->nfs4_acl;
2220 if (acl == NULL)
2221 goto out;
2222 if (buf == NULL) /* user is just asking for length */
2223 goto out_len;
2224 if (acl->cached == 0)
2225 goto out;
2226 ret = -ERANGE; /* see getxattr(2) man page */
2227 if (acl->len > buflen)
2228 goto out;
2229 memcpy(buf, acl->data, acl->len);
2230out_len:
2231 ret = acl->len;
2232out:
2233 spin_unlock(&inode->i_lock);
2234 return ret;
2235}
2236
2237static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2238{
2239 struct nfs4_cached_acl *acl;
2240
2241 if (buf && acl_len <= PAGE_SIZE) {
2242 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2243 if (acl == NULL)
2244 goto out;
2245 acl->cached = 1;
2246 memcpy(acl->data, buf, acl_len);
2247 } else {
2248 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2249 if (acl == NULL)
2250 goto out;
2251 acl->cached = 0;
2252 }
2253 acl->len = acl_len;
2254out:
2255 nfs4_set_cached_acl(inode, acl);
2256}
2257
2258static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2259{
aa1870af
BF		 2260 struct page *pages[NFS4ACL_MAXPAGES];
2261 struct nfs_getaclargs args = {
2262 .fh = NFS_FH(inode),
2263 .acl_pages = pages,
2264 .acl_len = buflen,
2265 };
2266 size_t resp_len = buflen;
e50a1c2e 2267 void *resp_buf;
aa1870af
BF		 2268 struct rpc_message msg = {
2269 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2270 .rpc_argp = &args,
2271 .rpc_resp = &resp_len,
2272 };
e50a1c2e 2273 struct page *localpage = NULL;
aa1870af
BF		 2274 int ret;
2275
e50a1c2e
BF		 2276 if (buflen < PAGE_SIZE) {
2277 /* As long as we're doing a round trip to the server anyway,
2278 * let's be prepared for a page of acl data. */
2279 localpage = alloc_page(GFP_KERNEL);
2280 resp_buf = page_address(localpage);
2281 if (localpage == NULL)
2282 return -ENOMEM;
2283 args.acl_pages[0] = localpage;
2284 args.acl_pgbase = 0;
2285 args.acl_len = PAGE_SIZE;
2286 } else {
2287 resp_buf = buf;
2288 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2289 }
aa1870af 2290 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2291 if (ret)
2292 goto out_free;
2293 if (resp_len > args.acl_len)
2294 nfs4_write_cached_acl(inode, NULL, resp_len);
2295 else
2296 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2297 if (buf) {
2298 ret = -ERANGE;
2299 if (resp_len > buflen)
2300 goto out_free;
2301 if (localpage)
2302 memcpy(buf, resp_buf, resp_len);
2303 }
2304 ret = resp_len;
2305out_free:
2306 if (localpage)
2307 __free_page(localpage);
aa1870af
BF		 2308 return ret;
2309}
2310
e50a1c2e
BF		 2311static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2312{
2313 struct nfs_server *server = NFS_SERVER(inode);
2314 int ret;
2315
2316 if (!nfs4_server_supports_acls(server))
2317 return -EOPNOTSUPP;
2318 ret = nfs_revalidate_inode(server, inode);
2319 if (ret < 0)
2320 return ret;
2321 ret = nfs4_read_cached_acl(inode, buf, buflen);
2322 if (ret != -ENOENT)
2323 return ret;
2324 return nfs4_get_acl_uncached(inode, buf, buflen);
2325}
2326
4b580ee3
BF		 2327static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2328{
2329 struct nfs_server *server = NFS_SERVER(inode);
2330 struct page *pages[NFS4ACL_MAXPAGES];
2331 struct nfs_setaclargs arg = {
2332 .fh = NFS_FH(inode),
2333 .acl_pages = pages,
2334 .acl_len = buflen,
2335 };
2336 struct rpc_message msg = {
2337 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2338 .rpc_argp = &arg,
2339 .rpc_resp = NULL,
2340 };
2341 int ret;
2342
2343 if (!nfs4_server_supports_acls(server))
2344 return -EOPNOTSUPP;
2345 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2346 ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
e50a1c2e
BF		 2347 if (ret == 0)
2348 nfs4_write_cached_acl(inode, buf, buflen);
4b580ee3
BF		 2349 return ret;
2350}
2351
1da177e4
LT		 2352static int
2353nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
2354{
2355 struct nfs4_client *clp = server->nfs4_state;
2356
2357 if (!clp || task->tk_status >= 0)
2358 return 0;
2359 switch(task->tk_status) {
2360 case -NFS4ERR_STALE_CLIENTID:
2361 case -NFS4ERR_STALE_STATEID:
2362 case -NFS4ERR_EXPIRED:
2363 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2364 nfs4_schedule_state_recovery(clp);
2365 if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2366 rpc_wake_up_task(task);
2367 task->tk_status = 0;
2368 return -EAGAIN;
2369 case -NFS4ERR_GRACE:
2370 case -NFS4ERR_DELAY:
2371 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2372 task->tk_status = 0;
2373 return -EAGAIN;
2374 case -NFS4ERR_OLD_STATEID:
2375 task->tk_status = 0;
2376 return -EAGAIN;
2377 }
2378 task->tk_status = nfs4_map_errors(task->tk_status);
2379 return 0;
2380}
2381
2382static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2383{
2384 DEFINE_WAIT(wait);
2385 sigset_t oldset;
2386 int interruptible, res = 0;
2387
2388 might_sleep();
2389
2390 rpc_clnt_sigmask(clnt, &oldset);
2391 interruptible = TASK_UNINTERRUPTIBLE;
2392 if (clnt->cl_intr)
2393 interruptible = TASK_INTERRUPTIBLE;
2394 prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2395 nfs4_schedule_state_recovery(clp);
2396 if (clnt->cl_intr && signalled())
2397 res = -ERESTARTSYS;
2398 else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2399 schedule();
2400 finish_wait(&clp->cl_waitq, &wait);
2401 rpc_clnt_sigunmask(clnt, &oldset);
2402 return res;
2403}
2404
2405static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2406{
2407 sigset_t oldset;
2408 int res = 0;
2409
2410 might_sleep();
2411
2412 if (*timeout <= 0)
2413 *timeout = NFS4_POLL_RETRY_MIN;
2414 if (*timeout > NFS4_POLL_RETRY_MAX)
2415 *timeout = NFS4_POLL_RETRY_MAX;
2416 rpc_clnt_sigmask(clnt, &oldset);
2417 if (clnt->cl_intr) {
2418 set_current_state(TASK_INTERRUPTIBLE);
2419 schedule_timeout(*timeout);
2420 if (signalled())
2421 res = -ERESTARTSYS;
2422 } else {
2423 set_current_state(TASK_UNINTERRUPTIBLE);
2424 schedule_timeout(*timeout);
2425 }
2426 rpc_clnt_sigunmask(clnt, &oldset);
2427 *timeout <<= 1;
2428 return res;
2429}
2430
2431/* This is the error handling routine for processes that are allowed
2432 * to sleep.
2433 */
2434int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2435{
2436 struct nfs4_client *clp = server->nfs4_state;
2437 int ret = errorcode;
2438
2439 exception->retry = 0;
2440 switch(errorcode) {
2441 case 0:
2442 return 0;
2443 case -NFS4ERR_STALE_CLIENTID:
2444 case -NFS4ERR_STALE_STATEID:
2445 case -NFS4ERR_EXPIRED:
2446 ret = nfs4_wait_clnt_recover(server->client, clp);
2447 if (ret == 0)
2448 exception->retry = 1;
2449 break;
2450 case -NFS4ERR_GRACE:
2451 case -NFS4ERR_DELAY:
2452 ret = nfs4_delay(server->client, &exception->timeout);
2453 if (ret == 0)
2454 exception->retry = 1;
2455 break;
2456 case -NFS4ERR_OLD_STATEID:
2457 if (ret == 0)
2458 exception->retry = 1;
2459 }
2460 /* We failed to handle the error */
2461 return nfs4_map_errors(ret);
2462}
2463
2464int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2465{
2466 nfs4_verifier sc_verifier;
2467 struct nfs4_setclientid setclientid = {
2468 .sc_verifier = &sc_verifier,
2469 .sc_prog = program,
2470 };
2471 struct rpc_message msg = {
2472 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2473 .rpc_argp = &setclientid,
2474 .rpc_resp = clp,
2475 .rpc_cred = clp->cl_cred,
2476 };
2477 u32 *p;
2478 int loop = 0;
2479 int status;
2480
2481 p = (u32*)sc_verifier.data;
2482 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2483 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2484
2485 for(;;) {
2486 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2487 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2488 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2489 clp->cl_cred->cr_ops->cr_name,
2490 clp->cl_id_uniquifier);
2491 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2492 sizeof(setclientid.sc_netid), "tcp");
2493 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2494 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2495 clp->cl_ipaddr, port >> 8, port & 255);
2496
2497 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2498 if (status != -NFS4ERR_CLID_INUSE)
2499 break;
2500 if (signalled())
2501 break;
2502 if (loop++ & 1)
2503 ssleep(clp->cl_lease_time + 1);
2504 else
2505 if (++clp->cl_id_uniquifier == 0)
2506 break;
2507 }
2508 return status;
2509}
2510
2511int
2512nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2513{
2514 struct nfs_fsinfo fsinfo;
2515 struct rpc_message msg = {
2516 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2517 .rpc_argp = clp,
2518 .rpc_resp = &fsinfo,
2519 .rpc_cred = clp->cl_cred,
2520 };
2521 unsigned long now;
2522 int status;
2523
2524 now = jiffies;
2525 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2526 if (status == 0) {
2527 spin_lock(&clp->cl_lock);
2528 clp->cl_lease_time = fsinfo.lease_time * HZ;
2529 clp->cl_last_renewal = now;
2530 spin_unlock(&clp->cl_lock);
2531 }
2532 return status;
2533}
2534
2535static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2536{
2537 struct nfs4_delegreturnargs args = {
2538 .fhandle = NFS_FH(inode),
2539 .stateid = stateid,
2540 };
2541 struct rpc_message msg = {
2542 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2543 .rpc_argp = &args,
2544 .rpc_cred = cred,
2545 };
2546
2547 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2548}
2549
2550int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2551{
2552 struct nfs_server *server = NFS_SERVER(inode);
2553 struct nfs4_exception exception = { };
2554 int err;
2555 do {
2556 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2557 switch (err) {
2558 case -NFS4ERR_STALE_STATEID:
2559 case -NFS4ERR_EXPIRED:
2560 nfs4_schedule_state_recovery(server->nfs4_state);
2561 case 0:
2562 return 0;
2563 }
2564 err = nfs4_handle_exception(server, err, &exception);
2565 } while (exception.retry);
2566 return err;
2567}
2568
2569#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2570#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2571
2572/*
2573 * sleep, with exponential backoff, and retry the LOCK operation.
2574 */
2575static unsigned long
2576nfs4_set_lock_task_retry(unsigned long timeout)
2577{
2578 current->state = TASK_INTERRUPTIBLE;
2579 schedule_timeout(timeout);
2580 timeout <<= 1;
2581 if (timeout > NFS4_LOCK_MAXTIMEOUT)
2582 return NFS4_LOCK_MAXTIMEOUT;
2583 return timeout;
2584}
2585
2586static inline int
2587nfs4_lck_type(int cmd, struct file_lock *request)
2588{
2589 /* set lock type */
2590 switch (request->fl_type) {
2591 case F_RDLCK:
2592 return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2593 case F_WRLCK:
2594 return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2595 case F_UNLCK:
2596 return NFS4_WRITE_LT;
2597 }
2598 BUG();
2599 return 0;
2600}
2601
2602static inline uint64_t
2603nfs4_lck_length(struct file_lock *request)
2604{
2605 if (request->fl_end == OFFSET_MAX)
2606 return ~(uint64_t)0;
2607 return request->fl_end - request->fl_start + 1;
2608}
2609
2610static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2611{
2612 struct inode *inode = state->inode;
2613 struct nfs_server *server = NFS_SERVER(inode);
2614 struct nfs4_client *clp = server->nfs4_state;
2615 struct nfs_lockargs arg = {
2616 .fh = NFS_FH(inode),
2617 .type = nfs4_lck_type(cmd, request),
2618 .offset = request->fl_start,
2619 .length = nfs4_lck_length(request),
2620 };
2621 struct nfs_lockres res = {
2622 .server = server,
2623 };
2624 struct rpc_message msg = {
2625 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2626 .rpc_argp = &arg,
2627 .rpc_resp = &res,
2628 .rpc_cred = state->owner->so_cred,
2629 };
2630 struct nfs_lowner nlo;
2631 struct nfs4_lock_state *lsp;
2632 int status;
2633
2634 down_read(&clp->cl_sem);
2635 nlo.clientid = clp->cl_clientid;
2636 down(&state->lock_sema);
2637 lsp = nfs4_find_lock_state(state, request->fl_owner);
2638 if (lsp)
2639 nlo.id = lsp->ls_id;
2640 else {
2641 spin_lock(&clp->cl_lock);
2642 nlo.id = nfs4_alloc_lockowner_id(clp);
2643 spin_unlock(&clp->cl_lock);
2644 }
2645 arg.u.lockt = &nlo;
2646 status = rpc_call_sync(server->client, &msg, 0);
2647 if (!status) {
2648 request->fl_type = F_UNLCK;
2649 } else if (status == -NFS4ERR_DENIED) {
2650 int64_t len, start, end;
2651 start = res.u.denied.offset;
2652 len = res.u.denied.length;
2653 end = start + len - 1;
2654 if (end < 0 || len == 0)
2655 request->fl_end = OFFSET_MAX;
2656 else
2657 request->fl_end = (loff_t)end;
2658 request->fl_start = (loff_t)start;
2659 request->fl_type = F_WRLCK;
2660 if (res.u.denied.type & 1)
2661 request->fl_type = F_RDLCK;
2662 request->fl_pid = 0;
2663 status = 0;
2664 }
2665 if (lsp)
2666 nfs4_put_lock_state(lsp);
2667 up(&state->lock_sema);
2668 up_read(&clp->cl_sem);
2669 return status;
2670}
2671
2672static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2673{
2674 struct nfs4_exception exception = { };
2675 int err;
2676
2677 do {
2678 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2679 _nfs4_proc_getlk(state, cmd, request),
2680 &exception);
2681 } while (exception.retry);
2682 return err;
2683}
2684
2685static int do_vfs_lock(struct file *file, struct file_lock *fl)
2686{
2687 int res = 0;
2688 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2689 case FL_POSIX:
2690 res = posix_lock_file_wait(file, fl);
2691 break;
2692 case FL_FLOCK:
2693 res = flock_lock_file_wait(file, fl);
2694 break;
2695 default:
2696 BUG();
2697 }
2698 if (res < 0)
2699 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2700 __FUNCTION__);
2701 return res;
2702}
2703
2704static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2705{
2706 struct inode *inode = state->inode;
2707 struct nfs_server *server = NFS_SERVER(inode);
2708 struct nfs4_client *clp = server->nfs4_state;
2709 struct nfs_lockargs arg = {
2710 .fh = NFS_FH(inode),
2711 .type = nfs4_lck_type(cmd, request),
2712 .offset = request->fl_start,
2713 .length = nfs4_lck_length(request),
2714 };
2715 struct nfs_lockres res = {
2716 .server = server,
2717 };
2718 struct rpc_message msg = {
2719 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2720 .rpc_argp = &arg,
2721 .rpc_resp = &res,
2722 .rpc_cred = state->owner->so_cred,
2723 };
2724 struct nfs4_lock_state *lsp;
2725 struct nfs_locku_opargs luargs;
2726 int status = 0;
2727
2728 down_read(&clp->cl_sem);
2729 down(&state->lock_sema);
2730 lsp = nfs4_find_lock_state(state, request->fl_owner);
2731 if (!lsp)
2732 goto out;
2733 /* We might have lost the locks! */
2734 if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
2735 luargs.seqid = lsp->ls_seqid;
2736 memcpy(&luargs.stateid, &lsp->ls_stateid, sizeof(luargs.stateid));
2737 arg.u.locku = &luargs;
2738 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2739 nfs4_increment_lock_seqid(status, lsp);
2740 }
2741
2742 if (status == 0) {
2743 memcpy(&lsp->ls_stateid, &res.u.stateid,
2744 sizeof(lsp->ls_stateid));
2745 nfs4_notify_unlck(state, request, lsp);
2746 }
2747 nfs4_put_lock_state(lsp);
2748out:
2749 up(&state->lock_sema);
2750 if (status == 0)
2751 do_vfs_lock(request->fl_file, request);
2752 up_read(&clp->cl_sem);
2753 return status;
2754}
2755
2756static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2757{
2758 struct nfs4_exception exception = { };
2759 int err;
2760
2761 do {
2762 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2763 _nfs4_proc_unlck(state, cmd, request),
2764 &exception);
2765 } while (exception.retry);
2766 return err;
2767}
2768
2769static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2770{
2771 struct inode *inode = state->inode;
2772 struct nfs_server *server = NFS_SERVER(inode);
2773 struct nfs4_lock_state *lsp;
2774 struct nfs_lockargs arg = {
2775 .fh = NFS_FH(inode),
2776 .type = nfs4_lck_type(cmd, request),
2777 .offset = request->fl_start,
2778 .length = nfs4_lck_length(request),
2779 };
2780 struct nfs_lockres res = {
2781 .server = server,
2782 };
2783 struct rpc_message msg = {
2784 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2785 .rpc_argp = &arg,
2786 .rpc_resp = &res,
2787 .rpc_cred = state->owner->so_cred,
2788 };
2789 struct nfs_lock_opargs largs = {
2790 .reclaim = reclaim,
2791 .new_lock_owner = 0,
2792 };
2793 int status;
2794
2795 lsp = nfs4_get_lock_state(state, request->fl_owner);
2796 if (lsp == NULL)
2797 return -ENOMEM;
2798 if (!(lsp->ls_flags & NFS_LOCK_INITIALIZED)) {
2799 struct nfs4_state_owner *owner = state->owner;
2800 struct nfs_open_to_lock otl = {
2801 .lock_owner = {
2802 .clientid = server->nfs4_state->cl_clientid,
2803 },
2804 };
2805
2806 otl.lock_seqid = lsp->ls_seqid;
2807 otl.lock_owner.id = lsp->ls_id;
2808 memcpy(&otl.open_stateid, &state->stateid, sizeof(otl.open_stateid));
2809 largs.u.open_lock = &otl;
2810 largs.new_lock_owner = 1;
2811 arg.u.lock = &largs;
2812 down(&owner->so_sema);
2813 otl.open_seqid = owner->so_seqid;
2814 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2815 /* increment open_owner seqid on success, and
2816 * seqid mutating errors */
2817 nfs4_increment_seqid(status, owner);
2818 up(&owner->so_sema);
2819 } else {
2820 struct nfs_exist_lock el = {
2821 .seqid = lsp->ls_seqid,
2822 };
2823 memcpy(&el.stateid, &lsp->ls_stateid, sizeof(el.stateid));
2824 largs.u.exist_lock = &el;
2825 largs.new_lock_owner = 0;
2826 arg.u.lock = &largs;
2827 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2828 }
2829 /* increment seqid on success, and * seqid mutating errors*/
2830 nfs4_increment_lock_seqid(status, lsp);
2831 /* save the returned stateid. */
2832 if (status == 0) {
2833 memcpy(&lsp->ls_stateid, &res.u.stateid, sizeof(nfs4_stateid));
2834 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2835 if (!reclaim)
2836 nfs4_notify_setlk(state, request, lsp);
2837 } else if (status == -NFS4ERR_DENIED)
2838 status = -EAGAIN;
2839 nfs4_put_lock_state(lsp);
2840 return status;
2841}
2842
2843static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2844{
2845 return _nfs4_do_setlk(state, F_SETLK, request, 1);
2846}
2847
2848static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
2849{
2850 return _nfs4_do_setlk(state, F_SETLK, request, 0);
2851}
2852
2853static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2854{
2855 struct nfs4_client *clp = state->owner->so_client;
2856 int status;
2857
2858 down_read(&clp->cl_sem);
2859 down(&state->lock_sema);
2860 status = _nfs4_do_setlk(state, cmd, request, 0);
2861 up(&state->lock_sema);
2862 if (status == 0) {
2863 /* Note: we always want to sleep here! */
2864 request->fl_flags |= FL_SLEEP;
2865 if (do_vfs_lock(request->fl_file, request) < 0)
2866 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
2867 }
2868 up_read(&clp->cl_sem);
2869 return status;
2870}
2871
2872static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2873{
2874 struct nfs4_exception exception = { };
2875 int err;
2876
2877 do {
2878 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2879 _nfs4_proc_setlk(state, cmd, request),
2880 &exception);
2881 } while (exception.retry);
2882 return err;
2883}
2884
2885static int
2886nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
2887{
2888 struct nfs_open_context *ctx;
2889 struct nfs4_state *state;
2890 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
2891 int status;
2892
2893 /* verify open state */
2894 ctx = (struct nfs_open_context *)filp->private_data;
2895 state = ctx->state;
2896
2897 if (request->fl_start < 0 || request->fl_end < 0)
2898 return -EINVAL;
2899
2900 if (IS_GETLK(cmd))
2901 return nfs4_proc_getlk(state, F_GETLK, request);
2902
2903 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
2904 return -EINVAL;
2905
2906 if (request->fl_type == F_UNLCK)
2907 return nfs4_proc_unlck(state, cmd, request);
2908
2909 do {
2910 status = nfs4_proc_setlk(state, cmd, request);
2911 if ((status != -EAGAIN) || IS_SETLK(cmd))
2912 break;
2913 timeout = nfs4_set_lock_task_retry(timeout);
2914 status = -ERESTARTSYS;
2915 if (signalled())
2916 break;
2917 } while(status < 0);
2918
2919 return status;
2920}
2921
6b3b5496 2922
aa1870af
BF		 2923#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
2924
6b3b5496
BF		 2925int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
2926 size_t buflen, int flags)
2927{
4b580ee3
BF		 2928 struct inode *inode = dentry->d_inode;
2929
2930 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
2931 return -EOPNOTSUPP;
2932
2933 if (!S_ISREG(inode->i_mode) &&
2934 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
2935 return -EPERM;
2936
2937 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 2938}
2939
2940/* The getxattr man page suggests returning -ENODATA for unknown attributes,
2941 * and that's what we'll do for e.g. user attributes that haven't been set.
2942 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
2943 * attributes in kernel-managed attribute namespaces. */
2944ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
2945 size_t buflen)
2946{
aa1870af
BF		 2947 struct inode *inode = dentry->d_inode;
2948
2949 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
2950 return -EOPNOTSUPP;
2951
2952 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 2953}
2954
2955ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
2956{
aa1870af 2957 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496
BF		 2958
2959 if (buf && buflen < len)
2960 return -ERANGE;
2961 if (buf)
aa1870af
BF		 2962 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
2963 return len;
6b3b5496
BF		 2964}
2965
1da177e4
LT		 2966struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
2967 .recover_open = nfs4_open_reclaim,
2968 .recover_lock = nfs4_lock_reclaim,
2969};
2970
2971struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
2972 .recover_open = nfs4_open_expired,
2973 .recover_lock = nfs4_lock_expired,
2974};
2975
6b3b5496
BF		 2976static struct inode_operations nfs4_file_inode_operations = {
2977 .permission = nfs_permission,
2978 .getattr = nfs_getattr,
2979 .setattr = nfs_setattr,
2980 .getxattr = nfs4_getxattr,
2981 .setxattr = nfs4_setxattr,
2982 .listxattr = nfs4_listxattr,
2983};
2984
1da177e4
LT		 2985struct nfs_rpc_ops nfs_v4_clientops = {
2986 .version = 4, /* protocol version */
2987 .dentry_ops = &nfs4_dentry_operations,
2988 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 2989 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 2990 .getroot = nfs4_proc_get_root,
2991 .getattr = nfs4_proc_getattr,
2992 .setattr = nfs4_proc_setattr,
2993 .lookup = nfs4_proc_lookup,
2994 .access = nfs4_proc_access,
2995 .readlink = nfs4_proc_readlink,
2996 .read = nfs4_proc_read,
2997 .write = nfs4_proc_write,
2998 .commit = nfs4_proc_commit,
2999 .create = nfs4_proc_create,
3000 .remove = nfs4_proc_remove,
3001 .unlink_setup = nfs4_proc_unlink_setup,
3002 .unlink_done = nfs4_proc_unlink_done,
3003 .rename = nfs4_proc_rename,
3004 .link = nfs4_proc_link,
3005 .symlink = nfs4_proc_symlink,
3006 .mkdir = nfs4_proc_mkdir,
3007 .rmdir = nfs4_proc_remove,
3008 .readdir = nfs4_proc_readdir,
3009 .mknod = nfs4_proc_mknod,
3010 .statfs = nfs4_proc_statfs,
3011 .fsinfo = nfs4_proc_fsinfo,
3012 .pathconf = nfs4_proc_pathconf,
3013 .decode_dirent = nfs4_decode_dirent,
3014 .read_setup = nfs4_proc_read_setup,
3015 .write_setup = nfs4_proc_write_setup,
3016 .commit_setup = nfs4_proc_commit_setup,
3017 .file_open = nfs4_proc_file_open,
3018 .file_release = nfs4_proc_file_release,
3019 .lock = nfs4_proc_lock,
e50a1c2e 3020 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3021};
3022
3023/*
3024 * Local variables:
3025 * c-basic-offset: 8
3026 * End:
3027 */
Linux 6.x block layer and io_uring tree(s)