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nfs41 delegreturn sequence setup done support
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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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 "internal.h"
55#include "iostat.h"
56
57#define NFSDBG_FACILITY NFSDBG_PROC
58
59#define NFS4_POLL_RETRY_MIN (HZ/10)
60#define NFS4_POLL_RETRY_MAX (15*HZ)
61
62struct nfs4_opendata;
63static int _nfs4_proc_open(struct nfs4_opendata *data);
64static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
65static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
66static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
67static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
68
69/* Prevent leaks of NFSv4 errors into userland */
70static int nfs4_map_errors(int err)
71{
72 if (err < -1000) {
73 dprintk("%s could not handle NFSv4 error %d\n",
74 __func__, -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, NFS_FILEID(dentry->d_inode));
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, NFS_FILEID(dentry->d_parent->d_inode));
190
191 readdir->pgbase = (char *)p - (char *)start;
192 readdir->count -= readdir->pgbase;
193 kunmap_atomic(start, KM_USER0);
194}
195
196static int nfs4_wait_clnt_recover(struct nfs_client *clp)
197{
198 int res;
199
200 might_sleep();
201
202 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
203 nfs_wait_bit_killable, TASK_KILLABLE);
204 return res;
205}
206
207static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
208{
209 int res = 0;
210
211 might_sleep();
212
213 if (*timeout <= 0)
214 *timeout = NFS4_POLL_RETRY_MIN;
215 if (*timeout > NFS4_POLL_RETRY_MAX)
216 *timeout = NFS4_POLL_RETRY_MAX;
217 schedule_timeout_killable(*timeout);
218 if (fatal_signal_pending(current))
219 res = -ERESTARTSYS;
220 *timeout <<= 1;
221 return res;
222}
223
224/* This is the error handling routine for processes that are allowed
225 * to sleep.
226 */
227static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
228{
229 struct nfs_client *clp = server->nfs_client;
230 struct nfs4_state *state = exception->state;
231 int ret = errorcode;
232
233 exception->retry = 0;
234 switch(errorcode) {
235 case 0:
236 return 0;
237 case -NFS4ERR_ADMIN_REVOKED:
238 case -NFS4ERR_BAD_STATEID:
239 case -NFS4ERR_OPENMODE:
240 if (state == NULL)
241 break;
242 nfs4_state_mark_reclaim_nograce(clp, state);
243 case -NFS4ERR_STALE_CLIENTID:
244 case -NFS4ERR_STALE_STATEID:
245 case -NFS4ERR_EXPIRED:
246 nfs4_schedule_state_recovery(clp);
247 ret = nfs4_wait_clnt_recover(clp);
248 if (ret == 0)
249 exception->retry = 1;
250 break;
251 case -NFS4ERR_FILE_OPEN:
252 case -NFS4ERR_GRACE:
253 case -NFS4ERR_DELAY:
254 ret = nfs4_delay(server->client, &exception->timeout);
255 if (ret != 0)
256 break;
257 case -NFS4ERR_OLD_STATEID:
258 exception->retry = 1;
259 }
260 /* We failed to handle the error */
261 return nfs4_map_errors(ret);
262}
263
264
265static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
266{
267 struct nfs_client *clp = server->nfs_client;
268 spin_lock(&clp->cl_lock);
269 if (time_before(clp->cl_last_renewal,timestamp))
270 clp->cl_last_renewal = timestamp;
271 spin_unlock(&clp->cl_lock);
272}
273
274#if defined(CONFIG_NFS_V4_1)
275
276/*
277 * nfs4_free_slot - free a slot and efficiently update slot table.
278 *
279 * freeing a slot is trivially done by clearing its respective bit
280 * in the bitmap.
281 * If the freed slotid equals highest_used_slotid we want to update it
282 * so that the server would be able to size down the slot table if needed,
283 * otherwise we know that the highest_used_slotid is still in use.
284 * When updating highest_used_slotid there may be "holes" in the bitmap
285 * so we need to scan down from highest_used_slotid to 0 looking for the now
286 * highest slotid in use.
287 * If none found, highest_used_slotid is set to -1.
288 */
289static void
290nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
291{
292 int slotid = free_slotid;
293
294 spin_lock(&tbl->slot_tbl_lock);
295 /* clear used bit in bitmap */
296 __clear_bit(slotid, tbl->used_slots);
297
298 /* update highest_used_slotid when it is freed */
299 if (slotid == tbl->highest_used_slotid) {
300 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
301 if (slotid >= 0 && slotid < tbl->max_slots)
302 tbl->highest_used_slotid = slotid;
303 else
304 tbl->highest_used_slotid = -1;
305 }
306 rpc_wake_up_next(&tbl->slot_tbl_waitq);
307 spin_unlock(&tbl->slot_tbl_lock);
308 dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
309 free_slotid, tbl->highest_used_slotid);
310}
311
312void nfs41_sequence_free_slot(const struct nfs_client *clp,
313 struct nfs4_sequence_res *res)
314{
315 struct nfs4_slot_table *tbl;
316
317 if (!nfs4_has_session(clp)) {
318 dprintk("%s: No session\n", __func__);
319 return;
320 }
321 tbl = &clp->cl_session->fc_slot_table;
322 if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
323 dprintk("%s: No slot\n", __func__);
324 /* just wake up the next guy waiting since
325 * we may have not consumed a slot after all */
326 rpc_wake_up_next(&tbl->slot_tbl_waitq);
327 return;
328 }
329 nfs4_free_slot(tbl, res->sr_slotid);
330 res->sr_slotid = NFS4_MAX_SLOT_TABLE;
331}
332
333static void nfs41_sequence_done(struct nfs_client *clp,
334 struct nfs4_sequence_res *res,
335 int rpc_status)
336{
337 unsigned long timestamp;
338 struct nfs4_slot_table *tbl;
339 struct nfs4_slot *slot;
340
341 /*
342 * sr_status remains 1 if an RPC level error occurred. The server
343 * may or may not have processed the sequence operation..
344 * Proceed as if the server received and processed the sequence
345 * operation.
346 */
347 if (res->sr_status == 1)
348 res->sr_status = NFS_OK;
349
350 /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
351 if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
352 goto out;
353
354 tbl = &clp->cl_session->fc_slot_table;
355 slot = tbl->slots + res->sr_slotid;
356
357 if (res->sr_status == 0) {
358 /* Update the slot's sequence and clientid lease timer */
359 ++slot->seq_nr;
360 timestamp = res->sr_renewal_time;
361 spin_lock(&clp->cl_lock);
362 if (time_before(clp->cl_last_renewal, timestamp))
363 clp->cl_last_renewal = timestamp;
364 spin_unlock(&clp->cl_lock);
365 return;
366 }
367out:
368 /* The session may be reset by one of the error handlers. */
369 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
370 nfs41_sequence_free_slot(clp, res);
371}
372
373/*
374 * nfs4_find_slot - efficiently look for a free slot
375 *
376 * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
377 * If found, we mark the slot as used, update the highest_used_slotid,
378 * and respectively set up the sequence operation args.
379 * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
380 *
381 * Note: must be called with under the slot_tbl_lock.
382 */
383static u8
384nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
385{
386 int slotid;
387 u8 ret_id = NFS4_MAX_SLOT_TABLE;
388 BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
389
390 dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
391 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
392 tbl->max_slots);
393 slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
394 if (slotid >= tbl->max_slots)
395 goto out;
396 __set_bit(slotid, tbl->used_slots);
397 if (slotid > tbl->highest_used_slotid)
398 tbl->highest_used_slotid = slotid;
399 ret_id = slotid;
400out:
401 dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
402 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
403 return ret_id;
404}
405
406static int nfs41_setup_sequence(struct nfs4_session *session,
407 struct nfs4_sequence_args *args,
408 struct nfs4_sequence_res *res,
409 int cache_reply,
410 struct rpc_task *task)
411{
412 struct nfs4_slot *slot;
413 struct nfs4_slot_table *tbl;
414 u8 slotid;
415
416 dprintk("--> %s\n", __func__);
417 /* slot already allocated? */
418 if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
419 return 0;
420
421 memset(res, 0, sizeof(*res));
422 res->sr_slotid = NFS4_MAX_SLOT_TABLE;
423 tbl = &session->fc_slot_table;
424
425 spin_lock(&tbl->slot_tbl_lock);
426 slotid = nfs4_find_slot(tbl, task);
427 if (slotid == NFS4_MAX_SLOT_TABLE) {
428 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
429 spin_unlock(&tbl->slot_tbl_lock);
430 dprintk("<-- %s: no free slots\n", __func__);
431 return -EAGAIN;
432 }
433 spin_unlock(&tbl->slot_tbl_lock);
434
435 slot = tbl->slots + slotid;
436 args->sa_slotid = slotid;
437 args->sa_cache_this = cache_reply;
438
439 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
440
441 res->sr_slotid = slotid;
442 res->sr_renewal_time = jiffies;
443 /*
444 * sr_status is only set in decode_sequence, and so will remain
445 * set to 1 if an rpc level failure occurs.
446 */
447 res->sr_status = 1;
448 return 0;
449}
450
451int nfs4_setup_sequence(struct nfs_client *clp,
452 struct nfs4_sequence_args *args,
453 struct nfs4_sequence_res *res,
454 int cache_reply,
455 struct rpc_task *task)
456{
457 int ret = 0;
458
459 dprintk("--> %s clp %p session %p sr_slotid %d\n",
460 __func__, clp, clp->cl_session, res->sr_slotid);
461
462 if (!nfs4_has_session(clp))
463 goto out;
464 ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
465 task);
466 if (ret != -EAGAIN) {
467 /* terminate rpc task */
468 task->tk_status = ret;
469 task->tk_action = NULL;
470 }
471out:
472 dprintk("<-- %s status=%d\n", __func__, ret);
473 return ret;
474}
475
476struct nfs41_call_sync_data {
477 struct nfs_client *clp;
478 struct nfs4_sequence_args *seq_args;
479 struct nfs4_sequence_res *seq_res;
480 int cache_reply;
481};
482
483static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
484{
485 struct nfs41_call_sync_data *data = calldata;
486
487 dprintk("--> %s data->clp->cl_session %p\n", __func__,
488 data->clp->cl_session);
489 if (nfs4_setup_sequence(data->clp, data->seq_args,
490 data->seq_res, data->cache_reply, task))
491 return;
492 rpc_call_start(task);
493}
494
495static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
496{
497 struct nfs41_call_sync_data *data = calldata;
498
499 nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
500 nfs41_sequence_free_slot(data->clp, data->seq_res);
501}
502
503struct rpc_call_ops nfs41_call_sync_ops = {
504 .rpc_call_prepare = nfs41_call_sync_prepare,
505 .rpc_call_done = nfs41_call_sync_done,
506};
507
508static int nfs4_call_sync_sequence(struct nfs_client *clp,
509 struct rpc_clnt *clnt,
510 struct rpc_message *msg,
511 struct nfs4_sequence_args *args,
512 struct nfs4_sequence_res *res,
513 int cache_reply)
514{
515 int ret;
516 struct rpc_task *task;
517 struct nfs41_call_sync_data data = {
518 .clp = clp,
519 .seq_args = args,
520 .seq_res = res,
521 .cache_reply = cache_reply,
522 };
523 struct rpc_task_setup task_setup = {
524 .rpc_client = clnt,
525 .rpc_message = msg,
526 .callback_ops = &nfs41_call_sync_ops,
527 .callback_data = &data
528 };
529
530 res->sr_slotid = NFS4_MAX_SLOT_TABLE;
531 task = rpc_run_task(&task_setup);
532 if (IS_ERR(task))
533 ret = PTR_ERR(task);
534 else {
535 ret = task->tk_status;
536 rpc_put_task(task);
537 }
538 return ret;
539}
540
541int _nfs4_call_sync_session(struct nfs_server *server,
542 struct rpc_message *msg,
543 struct nfs4_sequence_args *args,
544 struct nfs4_sequence_res *res,
545 int cache_reply)
546{
547 return nfs4_call_sync_sequence(server->nfs_client, server->client,
548 msg, args, res, cache_reply);
549}
550
551#endif /* CONFIG_NFS_V4_1 */
552
553int _nfs4_call_sync(struct nfs_server *server,
554 struct rpc_message *msg,
555 struct nfs4_sequence_args *args,
556 struct nfs4_sequence_res *res,
557 int cache_reply)
558{
559 args->sa_session = res->sr_session = NULL;
560 return rpc_call_sync(server->client, msg, 0);
561}
562
563#define nfs4_call_sync(server, msg, args, res, cache_reply) \
564 (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
565 &(res)->seq_res, (cache_reply))
566
567static void nfs4_sequence_done(const struct nfs_server *server,
568 struct nfs4_sequence_res *res, int rpc_status)
569{
570#ifdef CONFIG_NFS_V4_1
571 if (nfs4_has_session(server->nfs_client))
572 nfs41_sequence_done(server->nfs_client, res, rpc_status);
573#endif /* CONFIG_NFS_V4_1 */
574}
575
576/* no restart, therefore free slot here */
577static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
578 struct nfs4_sequence_res *res,
579 int rpc_status)
580{
581 nfs4_sequence_done(server, res, rpc_status);
582 nfs4_sequence_free_slot(server->nfs_client, res);
583}
584
585static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
586{
587 struct nfs_inode *nfsi = NFS_I(dir);
588
589 spin_lock(&dir->i_lock);
590 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
591 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
592 nfs_force_lookup_revalidate(dir);
593 nfsi->change_attr = cinfo->after;
594 spin_unlock(&dir->i_lock);
595}
596
597struct nfs4_opendata {
598 struct kref kref;
599 struct nfs_openargs o_arg;
600 struct nfs_openres o_res;
601 struct nfs_open_confirmargs c_arg;
602 struct nfs_open_confirmres c_res;
603 struct nfs_fattr f_attr;
604 struct nfs_fattr dir_attr;
605 struct path path;
606 struct dentry *dir;
607 struct nfs4_state_owner *owner;
608 struct nfs4_state *state;
609 struct iattr attrs;
610 unsigned long timestamp;
611 unsigned int rpc_done : 1;
612 int rpc_status;
613 int cancelled;
614};
615
616
617static void nfs4_init_opendata_res(struct nfs4_opendata *p)
618{
619 p->o_res.f_attr = &p->f_attr;
620 p->o_res.dir_attr = &p->dir_attr;
621 p->o_res.seqid = p->o_arg.seqid;
622 p->c_res.seqid = p->c_arg.seqid;
623 p->o_res.server = p->o_arg.server;
624 nfs_fattr_init(&p->f_attr);
625 nfs_fattr_init(&p->dir_attr);
626}
627
628static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
629 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
630 const struct iattr *attrs)
631{
632 struct dentry *parent = dget_parent(path->dentry);
633 struct inode *dir = parent->d_inode;
634 struct nfs_server *server = NFS_SERVER(dir);
635 struct nfs4_opendata *p;
636
637 p = kzalloc(sizeof(*p), GFP_KERNEL);
638 if (p == NULL)
639 goto err;
640 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
641 if (p->o_arg.seqid == NULL)
642 goto err_free;
643 p->path.mnt = mntget(path->mnt);
644 p->path.dentry = dget(path->dentry);
645 p->dir = parent;
646 p->owner = sp;
647 atomic_inc(&sp->so_count);
648 p->o_arg.fh = NFS_FH(dir);
649 p->o_arg.open_flags = flags;
650 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
651 p->o_arg.clientid = server->nfs_client->cl_clientid;
652 p->o_arg.id = sp->so_owner_id.id;
653 p->o_arg.name = &p->path.dentry->d_name;
654 p->o_arg.server = server;
655 p->o_arg.bitmask = server->attr_bitmask;
656 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
657 p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
658 if (flags & O_EXCL) {
659 u32 *s = (u32 *) p->o_arg.u.verifier.data;
660 s[0] = jiffies;
661 s[1] = current->pid;
662 } else if (flags & O_CREAT) {
663 p->o_arg.u.attrs = &p->attrs;
664 memcpy(&p->attrs, attrs, sizeof(p->attrs));
665 }
666 p->c_arg.fh = &p->o_res.fh;
667 p->c_arg.stateid = &p->o_res.stateid;
668 p->c_arg.seqid = p->o_arg.seqid;
669 nfs4_init_opendata_res(p);
670 kref_init(&p->kref);
671 return p;
672err_free:
673 kfree(p);
674err:
675 dput(parent);
676 return NULL;
677}
678
679static void nfs4_opendata_free(struct kref *kref)
680{
681 struct nfs4_opendata *p = container_of(kref,
682 struct nfs4_opendata, kref);
683
684 nfs_free_seqid(p->o_arg.seqid);
685 if (p->state != NULL)
686 nfs4_put_open_state(p->state);
687 nfs4_put_state_owner(p->owner);
688 dput(p->dir);
689 path_put(&p->path);
690 kfree(p);
691}
692
693static void nfs4_opendata_put(struct nfs4_opendata *p)
694{
695 if (p != NULL)
696 kref_put(&p->kref, nfs4_opendata_free);
697}
698
699static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
700{
701 int ret;
702
703 ret = rpc_wait_for_completion_task(task);
704 return ret;
705}
706
707static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
708{
709 int ret = 0;
710
711 if (open_mode & O_EXCL)
712 goto out;
713 switch (mode & (FMODE_READ|FMODE_WRITE)) {
714 case FMODE_READ:
715 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
716 break;
717 case FMODE_WRITE:
718 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
719 break;
720 case FMODE_READ|FMODE_WRITE:
721 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
722 }
723out:
724 return ret;
725}
726
727static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
728{
729 if ((delegation->type & fmode) != fmode)
730 return 0;
731 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
732 return 0;
733 nfs_mark_delegation_referenced(delegation);
734 return 1;
735}
736
737static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
738{
739 switch (fmode) {
740 case FMODE_WRITE:
741 state->n_wronly++;
742 break;
743 case FMODE_READ:
744 state->n_rdonly++;
745 break;
746 case FMODE_READ|FMODE_WRITE:
747 state->n_rdwr++;
748 }
749 nfs4_state_set_mode_locked(state, state->state | fmode);
750}
751
752static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
753{
754 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
755 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
756 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
757 switch (fmode) {
758 case FMODE_READ:
759 set_bit(NFS_O_RDONLY_STATE, &state->flags);
760 break;
761 case FMODE_WRITE:
762 set_bit(NFS_O_WRONLY_STATE, &state->flags);
763 break;
764 case FMODE_READ|FMODE_WRITE:
765 set_bit(NFS_O_RDWR_STATE, &state->flags);
766 }
767}
768
769static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
770{
771 write_seqlock(&state->seqlock);
772 nfs_set_open_stateid_locked(state, stateid, fmode);
773 write_sequnlock(&state->seqlock);
774}
775
776static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
777{
778 /*
779 * Protect the call to nfs4_state_set_mode_locked and
780 * serialise the stateid update
781 */
782 write_seqlock(&state->seqlock);
783 if (deleg_stateid != NULL) {
784 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
785 set_bit(NFS_DELEGATED_STATE, &state->flags);
786 }
787 if (open_stateid != NULL)
788 nfs_set_open_stateid_locked(state, open_stateid, fmode);
789 write_sequnlock(&state->seqlock);
790 spin_lock(&state->owner->so_lock);
791 update_open_stateflags(state, fmode);
792 spin_unlock(&state->owner->so_lock);
793}
794
795static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
796{
797 struct nfs_inode *nfsi = NFS_I(state->inode);
798 struct nfs_delegation *deleg_cur;
799 int ret = 0;
800
801 fmode &= (FMODE_READ|FMODE_WRITE);
802
803 rcu_read_lock();
804 deleg_cur = rcu_dereference(nfsi->delegation);
805 if (deleg_cur == NULL)
806 goto no_delegation;
807
808 spin_lock(&deleg_cur->lock);
809 if (nfsi->delegation != deleg_cur ||
810 (deleg_cur->type & fmode) != fmode)
811 goto no_delegation_unlock;
812
813 if (delegation == NULL)
814 delegation = &deleg_cur->stateid;
815 else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
816 goto no_delegation_unlock;
817
818 nfs_mark_delegation_referenced(deleg_cur);
819 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
820 ret = 1;
821no_delegation_unlock:
822 spin_unlock(&deleg_cur->lock);
823no_delegation:
824 rcu_read_unlock();
825
826 if (!ret && open_stateid != NULL) {
827 __update_open_stateid(state, open_stateid, NULL, fmode);
828 ret = 1;
829 }
830
831 return ret;
832}
833
834
835static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
836{
837 struct nfs_delegation *delegation;
838
839 rcu_read_lock();
840 delegation = rcu_dereference(NFS_I(inode)->delegation);
841 if (delegation == NULL || (delegation->type & fmode) == fmode) {
842 rcu_read_unlock();
843 return;
844 }
845 rcu_read_unlock();
846 nfs_inode_return_delegation(inode);
847}
848
849static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
850{
851 struct nfs4_state *state = opendata->state;
852 struct nfs_inode *nfsi = NFS_I(state->inode);
853 struct nfs_delegation *delegation;
854 int open_mode = opendata->o_arg.open_flags & O_EXCL;
855 fmode_t fmode = opendata->o_arg.fmode;
856 nfs4_stateid stateid;
857 int ret = -EAGAIN;
858
859 for (;;) {
860 if (can_open_cached(state, fmode, open_mode)) {
861 spin_lock(&state->owner->so_lock);
862 if (can_open_cached(state, fmode, open_mode)) {
863 update_open_stateflags(state, fmode);
864 spin_unlock(&state->owner->so_lock);
865 goto out_return_state;
866 }
867 spin_unlock(&state->owner->so_lock);
868 }
869 rcu_read_lock();
870 delegation = rcu_dereference(nfsi->delegation);
871 if (delegation == NULL ||
872 !can_open_delegated(delegation, fmode)) {
873 rcu_read_unlock();
874 break;
875 }
876 /* Save the delegation */
877 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
878 rcu_read_unlock();
879 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
880 if (ret != 0)
881 goto out;
882 ret = -EAGAIN;
883
884 /* Try to update the stateid using the delegation */
885 if (update_open_stateid(state, NULL, &stateid, fmode))
886 goto out_return_state;
887 }
888out:
889 return ERR_PTR(ret);
890out_return_state:
891 atomic_inc(&state->count);
892 return state;
893}
894
895static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
896{
897 struct inode *inode;
898 struct nfs4_state *state = NULL;
899 struct nfs_delegation *delegation;
900 int ret;
901
902 if (!data->rpc_done) {
903 state = nfs4_try_open_cached(data);
904 goto out;
905 }
906
907 ret = -EAGAIN;
908 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
909 goto err;
910 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
911 ret = PTR_ERR(inode);
912 if (IS_ERR(inode))
913 goto err;
914 ret = -ENOMEM;
915 state = nfs4_get_open_state(inode, data->owner);
916 if (state == NULL)
917 goto err_put_inode;
918 if (data->o_res.delegation_type != 0) {
919 int delegation_flags = 0;
920
921 rcu_read_lock();
922 delegation = rcu_dereference(NFS_I(inode)->delegation);
923 if (delegation)
924 delegation_flags = delegation->flags;
925 rcu_read_unlock();
926 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
927 nfs_inode_set_delegation(state->inode,
928 data->owner->so_cred,
929 &data->o_res);
930 else
931 nfs_inode_reclaim_delegation(state->inode,
932 data->owner->so_cred,
933 &data->o_res);
934 }
935
936 update_open_stateid(state, &data->o_res.stateid, NULL,
937 data->o_arg.fmode);
938 iput(inode);
939out:
940 return state;
941err_put_inode:
942 iput(inode);
943err:
944 return ERR_PTR(ret);
945}
946
947static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
948{
949 struct nfs_inode *nfsi = NFS_I(state->inode);
950 struct nfs_open_context *ctx;
951
952 spin_lock(&state->inode->i_lock);
953 list_for_each_entry(ctx, &nfsi->open_files, list) {
954 if (ctx->state != state)
955 continue;
956 get_nfs_open_context(ctx);
957 spin_unlock(&state->inode->i_lock);
958 return ctx;
959 }
960 spin_unlock(&state->inode->i_lock);
961 return ERR_PTR(-ENOENT);
962}
963
964static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
965{
966 struct nfs4_opendata *opendata;
967
968 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
969 if (opendata == NULL)
970 return ERR_PTR(-ENOMEM);
971 opendata->state = state;
972 atomic_inc(&state->count);
973 return opendata;
974}
975
976static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
977{
978 struct nfs4_state *newstate;
979 int ret;
980
981 opendata->o_arg.open_flags = 0;
982 opendata->o_arg.fmode = fmode;
983 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
984 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
985 nfs4_init_opendata_res(opendata);
986 ret = _nfs4_proc_open(opendata);
987 if (ret != 0)
988 return ret;
989 newstate = nfs4_opendata_to_nfs4_state(opendata);
990 if (IS_ERR(newstate))
991 return PTR_ERR(newstate);
992 nfs4_close_state(&opendata->path, newstate, fmode);
993 *res = newstate;
994 return 0;
995}
996
997static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
998{
999 struct nfs4_state *newstate;
1000 int ret;
1001
1002 /* memory barrier prior to reading state->n_* */
1003 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1004 smp_rmb();
1005 if (state->n_rdwr != 0) {
1006 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1007 if (ret != 0)
1008 return ret;
1009 if (newstate != state)
1010 return -ESTALE;
1011 }
1012 if (state->n_wronly != 0) {
1013 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1014 if (ret != 0)
1015 return ret;
1016 if (newstate != state)
1017 return -ESTALE;
1018 }
1019 if (state->n_rdonly != 0) {
1020 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1021 if (ret != 0)
1022 return ret;
1023 if (newstate != state)
1024 return -ESTALE;
1025 }
1026 /*
1027 * We may have performed cached opens for all three recoveries.
1028 * Check if we need to update the current stateid.
1029 */
1030 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1031 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1032 write_seqlock(&state->seqlock);
1033 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1034 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1035 write_sequnlock(&state->seqlock);
1036 }
1037 return 0;
1038}
1039
1040/*
1041 * OPEN_RECLAIM:
1042 * reclaim state on the server after a reboot.
1043 */
1044static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1045{
1046 struct nfs_delegation *delegation;
1047 struct nfs4_opendata *opendata;
1048 fmode_t delegation_type = 0;
1049 int status;
1050
1051 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1052 if (IS_ERR(opendata))
1053 return PTR_ERR(opendata);
1054 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1055 opendata->o_arg.fh = NFS_FH(state->inode);
1056 rcu_read_lock();
1057 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1058 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1059 delegation_type = delegation->type;
1060 rcu_read_unlock();
1061 opendata->o_arg.u.delegation_type = delegation_type;
1062 status = nfs4_open_recover(opendata, state);
1063 nfs4_opendata_put(opendata);
1064 return status;
1065}
1066
1067static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1068{
1069 struct nfs_server *server = NFS_SERVER(state->inode);
1070 struct nfs4_exception exception = { };
1071 int err;
1072 do {
1073 err = _nfs4_do_open_reclaim(ctx, state);
1074 if (err != -NFS4ERR_DELAY)
1075 break;
1076 nfs4_handle_exception(server, err, &exception);
1077 } while (exception.retry);
1078 return err;
1079}
1080
1081static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1082{
1083 struct nfs_open_context *ctx;
1084 int ret;
1085
1086 ctx = nfs4_state_find_open_context(state);
1087 if (IS_ERR(ctx))
1088 return PTR_ERR(ctx);
1089 ret = nfs4_do_open_reclaim(ctx, state);
1090 put_nfs_open_context(ctx);
1091 return ret;
1092}
1093
1094static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1095{
1096 struct nfs4_opendata *opendata;
1097 int ret;
1098
1099 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1100 if (IS_ERR(opendata))
1101 return PTR_ERR(opendata);
1102 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1103 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1104 sizeof(opendata->o_arg.u.delegation.data));
1105 ret = nfs4_open_recover(opendata, state);
1106 nfs4_opendata_put(opendata);
1107 return ret;
1108}
1109
1110int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1111{
1112 struct nfs4_exception exception = { };
1113 struct nfs_server *server = NFS_SERVER(state->inode);
1114 int err;
1115 do {
1116 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1117 switch (err) {
1118 case 0:
1119 return err;
1120 case -NFS4ERR_STALE_CLIENTID:
1121 case -NFS4ERR_STALE_STATEID:
1122 case -NFS4ERR_EXPIRED:
1123 /* Don't recall a delegation if it was lost */
1124 nfs4_schedule_state_recovery(server->nfs_client);
1125 return err;
1126 }
1127 err = nfs4_handle_exception(server, err, &exception);
1128 } while (exception.retry);
1129 return err;
1130}
1131
1132static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1133{
1134 struct nfs4_opendata *data = calldata;
1135
1136 data->rpc_status = task->tk_status;
1137 if (RPC_ASSASSINATED(task))
1138 return;
1139 if (data->rpc_status == 0) {
1140 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1141 sizeof(data->o_res.stateid.data));
1142 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1143 renew_lease(data->o_res.server, data->timestamp);
1144 data->rpc_done = 1;
1145 }
1146}
1147
1148static void nfs4_open_confirm_release(void *calldata)
1149{
1150 struct nfs4_opendata *data = calldata;
1151 struct nfs4_state *state = NULL;
1152
1153 /* If this request hasn't been cancelled, do nothing */
1154 if (data->cancelled == 0)
1155 goto out_free;
1156 /* In case of error, no cleanup! */
1157 if (!data->rpc_done)
1158 goto out_free;
1159 state = nfs4_opendata_to_nfs4_state(data);
1160 if (!IS_ERR(state))
1161 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1162out_free:
1163 nfs4_opendata_put(data);
1164}
1165
1166static const struct rpc_call_ops nfs4_open_confirm_ops = {
1167 .rpc_call_done = nfs4_open_confirm_done,
1168 .rpc_release = nfs4_open_confirm_release,
1169};
1170
1171/*
1172 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1173 */
1174static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1175{
1176 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1177 struct rpc_task *task;
1178 struct rpc_message msg = {
1179 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1180 .rpc_argp = &data->c_arg,
1181 .rpc_resp = &data->c_res,
1182 .rpc_cred = data->owner->so_cred,
1183 };
1184 struct rpc_task_setup task_setup_data = {
1185 .rpc_client = server->client,
1186 .rpc_message = &msg,
1187 .callback_ops = &nfs4_open_confirm_ops,
1188 .callback_data = data,
1189 .workqueue = nfsiod_workqueue,
1190 .flags = RPC_TASK_ASYNC,
1191 };
1192 int status;
1193
1194 kref_get(&data->kref);
1195 data->rpc_done = 0;
1196 data->rpc_status = 0;
1197 data->timestamp = jiffies;
1198 task = rpc_run_task(&task_setup_data);
1199 if (IS_ERR(task))
1200 return PTR_ERR(task);
1201 status = nfs4_wait_for_completion_rpc_task(task);
1202 if (status != 0) {
1203 data->cancelled = 1;
1204 smp_wmb();
1205 } else
1206 status = data->rpc_status;
1207 rpc_put_task(task);
1208 return status;
1209}
1210
1211static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1212{
1213 struct nfs4_opendata *data = calldata;
1214 struct nfs4_state_owner *sp = data->owner;
1215
1216 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1217 return;
1218 /*
1219 * Check if we still need to send an OPEN call, or if we can use
1220 * a delegation instead.
1221 */
1222 if (data->state != NULL) {
1223 struct nfs_delegation *delegation;
1224
1225 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1226 goto out_no_action;
1227 rcu_read_lock();
1228 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1229 if (delegation != NULL &&
1230 test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1231 rcu_read_unlock();
1232 goto out_no_action;
1233 }
1234 rcu_read_unlock();
1235 }
1236 /* Update sequence id. */
1237 data->o_arg.id = sp->so_owner_id.id;
1238 data->o_arg.clientid = sp->so_client->cl_clientid;
1239 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1240 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1241 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1242 }
1243 data->timestamp = jiffies;
1244 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1245 &data->o_arg.seq_args,
1246 &data->o_res.seq_res, 1, task))
1247 return;
1248 rpc_call_start(task);
1249 return;
1250out_no_action:
1251 task->tk_action = NULL;
1252
1253}
1254
1255static void nfs4_open_done(struct rpc_task *task, void *calldata)
1256{
1257 struct nfs4_opendata *data = calldata;
1258
1259 data->rpc_status = task->tk_status;
1260
1261 nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
1262 task->tk_status);
1263
1264 if (RPC_ASSASSINATED(task))
1265 return;
1266 if (task->tk_status == 0) {
1267 switch (data->o_res.f_attr->mode & S_IFMT) {
1268 case S_IFREG:
1269 break;
1270 case S_IFLNK:
1271 data->rpc_status = -ELOOP;
1272 break;
1273 case S_IFDIR:
1274 data->rpc_status = -EISDIR;
1275 break;
1276 default:
1277 data->rpc_status = -ENOTDIR;
1278 }
1279 renew_lease(data->o_res.server, data->timestamp);
1280 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1281 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1282 }
1283 data->rpc_done = 1;
1284}
1285
1286static void nfs4_open_release(void *calldata)
1287{
1288 struct nfs4_opendata *data = calldata;
1289 struct nfs4_state *state = NULL;
1290
1291 /* If this request hasn't been cancelled, do nothing */
1292 if (data->cancelled == 0)
1293 goto out_free;
1294 /* In case of error, no cleanup! */
1295 if (data->rpc_status != 0 || !data->rpc_done)
1296 goto out_free;
1297 /* In case we need an open_confirm, no cleanup! */
1298 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1299 goto out_free;
1300 state = nfs4_opendata_to_nfs4_state(data);
1301 if (!IS_ERR(state))
1302 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1303out_free:
1304 nfs4_opendata_put(data);
1305}
1306
1307static const struct rpc_call_ops nfs4_open_ops = {
1308 .rpc_call_prepare = nfs4_open_prepare,
1309 .rpc_call_done = nfs4_open_done,
1310 .rpc_release = nfs4_open_release,
1311};
1312
1313/*
1314 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1315 */
1316static int _nfs4_proc_open(struct nfs4_opendata *data)
1317{
1318 struct inode *dir = data->dir->d_inode;
1319 struct nfs_server *server = NFS_SERVER(dir);
1320 struct nfs_openargs *o_arg = &data->o_arg;
1321 struct nfs_openres *o_res = &data->o_res;
1322 struct rpc_task *task;
1323 struct rpc_message msg = {
1324 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1325 .rpc_argp = o_arg,
1326 .rpc_resp = o_res,
1327 .rpc_cred = data->owner->so_cred,
1328 };
1329 struct rpc_task_setup task_setup_data = {
1330 .rpc_client = server->client,
1331 .rpc_message = &msg,
1332 .callback_ops = &nfs4_open_ops,
1333 .callback_data = data,
1334 .workqueue = nfsiod_workqueue,
1335 .flags = RPC_TASK_ASYNC,
1336 };
1337 int status;
1338
1339 kref_get(&data->kref);
1340 data->rpc_done = 0;
1341 data->rpc_status = 0;
1342 data->cancelled = 0;
1343 task = rpc_run_task(&task_setup_data);
1344 if (IS_ERR(task))
1345 return PTR_ERR(task);
1346 status = nfs4_wait_for_completion_rpc_task(task);
1347 if (status != 0) {
1348 data->cancelled = 1;
1349 smp_wmb();
1350 } else
1351 status = data->rpc_status;
1352 rpc_put_task(task);
1353 if (status != 0 || !data->rpc_done)
1354 return status;
1355
1356 if (o_res->fh.size == 0)
1357 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1358
1359 if (o_arg->open_flags & O_CREAT) {
1360 update_changeattr(dir, &o_res->cinfo);
1361 nfs_post_op_update_inode(dir, o_res->dir_attr);
1362 } else
1363 nfs_refresh_inode(dir, o_res->dir_attr);
1364 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1365 status = _nfs4_proc_open_confirm(data);
1366 if (status != 0)
1367 return status;
1368 }
1369 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1370 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1371 return 0;
1372}
1373
1374static int nfs4_recover_expired_lease(struct nfs_server *server)
1375{
1376 struct nfs_client *clp = server->nfs_client;
1377 int ret;
1378
1379 for (;;) {
1380 ret = nfs4_wait_clnt_recover(clp);
1381 if (ret != 0)
1382 return ret;
1383 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1384 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1385 break;
1386 nfs4_schedule_state_recovery(clp);
1387 }
1388 return 0;
1389}
1390
1391/*
1392 * OPEN_EXPIRED:
1393 * reclaim state on the server after a network partition.
1394 * Assumes caller holds the appropriate lock
1395 */
1396static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1397{
1398 struct nfs4_opendata *opendata;
1399 int ret;
1400
1401 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1402 if (IS_ERR(opendata))
1403 return PTR_ERR(opendata);
1404 ret = nfs4_open_recover(opendata, state);
1405 if (ret == -ESTALE)
1406 d_drop(ctx->path.dentry);
1407 nfs4_opendata_put(opendata);
1408 return ret;
1409}
1410
1411static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1412{
1413 struct nfs_server *server = NFS_SERVER(state->inode);
1414 struct nfs4_exception exception = { };
1415 int err;
1416
1417 do {
1418 err = _nfs4_open_expired(ctx, state);
1419 if (err != -NFS4ERR_DELAY)
1420 break;
1421 nfs4_handle_exception(server, err, &exception);
1422 } while (exception.retry);
1423 return err;
1424}
1425
1426static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1427{
1428 struct nfs_open_context *ctx;
1429 int ret;
1430
1431 ctx = nfs4_state_find_open_context(state);
1432 if (IS_ERR(ctx))
1433 return PTR_ERR(ctx);
1434 ret = nfs4_do_open_expired(ctx, state);
1435 put_nfs_open_context(ctx);
1436 return ret;
1437}
1438
1439/*
1440 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1441 * fields corresponding to attributes that were used to store the verifier.
1442 * Make sure we clobber those fields in the later setattr call
1443 */
1444static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1445{
1446 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1447 !(sattr->ia_valid & ATTR_ATIME_SET))
1448 sattr->ia_valid |= ATTR_ATIME;
1449
1450 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1451 !(sattr->ia_valid & ATTR_MTIME_SET))
1452 sattr->ia_valid |= ATTR_MTIME;
1453}
1454
1455/*
1456 * Returns a referenced nfs4_state
1457 */
1458static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1459{
1460 struct nfs4_state_owner *sp;
1461 struct nfs4_state *state = NULL;
1462 struct nfs_server *server = NFS_SERVER(dir);
1463 struct nfs4_opendata *opendata;
1464 int status;
1465
1466 /* Protect against reboot recovery conflicts */
1467 status = -ENOMEM;
1468 if (!(sp = nfs4_get_state_owner(server, cred))) {
1469 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1470 goto out_err;
1471 }
1472 status = nfs4_recover_expired_lease(server);
1473 if (status != 0)
1474 goto err_put_state_owner;
1475 if (path->dentry->d_inode != NULL)
1476 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1477 status = -ENOMEM;
1478 opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1479 if (opendata == NULL)
1480 goto err_put_state_owner;
1481
1482 if (path->dentry->d_inode != NULL)
1483 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1484
1485 status = _nfs4_proc_open(opendata);
1486 if (status != 0)
1487 goto err_opendata_put;
1488
1489 if (opendata->o_arg.open_flags & O_EXCL)
1490 nfs4_exclusive_attrset(opendata, sattr);
1491
1492 state = nfs4_opendata_to_nfs4_state(opendata);
1493 status = PTR_ERR(state);
1494 if (IS_ERR(state))
1495 goto err_opendata_put;
1496 nfs4_opendata_put(opendata);
1497 nfs4_put_state_owner(sp);
1498 *res = state;
1499 return 0;
1500err_opendata_put:
1501 nfs4_opendata_put(opendata);
1502err_put_state_owner:
1503 nfs4_put_state_owner(sp);
1504out_err:
1505 *res = NULL;
1506 return status;
1507}
1508
1509
1510static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1511{
1512 struct nfs4_exception exception = { };
1513 struct nfs4_state *res;
1514 int status;
1515
1516 do {
1517 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1518 if (status == 0)
1519 break;
1520 /* NOTE: BAD_SEQID means the server and client disagree about the
1521 * book-keeping w.r.t. state-changing operations
1522 * (OPEN/CLOSE/LOCK/LOCKU...)
1523 * It is actually a sign of a bug on the client or on the server.
1524 *
1525 * If we receive a BAD_SEQID error in the particular case of
1526 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1527 * have unhashed the old state_owner for us, and that we can
1528 * therefore safely retry using a new one. We should still warn
1529 * the user though...
1530 */
1531 if (status == -NFS4ERR_BAD_SEQID) {
1532 printk(KERN_WARNING "NFS: v4 server %s "
1533 " returned a bad sequence-id error!\n",
1534 NFS_SERVER(dir)->nfs_client->cl_hostname);
1535 exception.retry = 1;
1536 continue;
1537 }
1538 /*
1539 * BAD_STATEID on OPEN means that the server cancelled our
1540 * state before it received the OPEN_CONFIRM.
1541 * Recover by retrying the request as per the discussion
1542 * on Page 181 of RFC3530.
1543 */
1544 if (status == -NFS4ERR_BAD_STATEID) {
1545 exception.retry = 1;
1546 continue;
1547 }
1548 if (status == -EAGAIN) {
1549 /* We must have found a delegation */
1550 exception.retry = 1;
1551 continue;
1552 }
1553 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1554 status, &exception));
1555 } while (exception.retry);
1556 return res;
1557}
1558
1559static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1560 struct nfs_fattr *fattr, struct iattr *sattr,
1561 struct nfs4_state *state)
1562{
1563 struct nfs_server *server = NFS_SERVER(inode);
1564 struct nfs_setattrargs arg = {
1565 .fh = NFS_FH(inode),
1566 .iap = sattr,
1567 .server = server,
1568 .bitmask = server->attr_bitmask,
1569 };
1570 struct nfs_setattrres res = {
1571 .fattr = fattr,
1572 .server = server,
1573 };
1574 struct rpc_message msg = {
1575 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1576 .rpc_argp = &arg,
1577 .rpc_resp = &res,
1578 .rpc_cred = cred,
1579 };
1580 unsigned long timestamp = jiffies;
1581 int status;
1582
1583 nfs_fattr_init(fattr);
1584
1585 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1586 /* Use that stateid */
1587 } else if (state != NULL) {
1588 nfs4_copy_stateid(&arg.stateid, state, current->files);
1589 } else
1590 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1591
1592 status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1593 if (status == 0 && state != NULL)
1594 renew_lease(server, timestamp);
1595 return status;
1596}
1597
1598static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1599 struct nfs_fattr *fattr, struct iattr *sattr,
1600 struct nfs4_state *state)
1601{
1602 struct nfs_server *server = NFS_SERVER(inode);
1603 struct nfs4_exception exception = { };
1604 int err;
1605 do {
1606 err = nfs4_handle_exception(server,
1607 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1608 &exception);
1609 } while (exception.retry);
1610 return err;
1611}
1612
1613struct nfs4_closedata {
1614 struct path path;
1615 struct inode *inode;
1616 struct nfs4_state *state;
1617 struct nfs_closeargs arg;
1618 struct nfs_closeres res;
1619 struct nfs_fattr fattr;
1620 unsigned long timestamp;
1621};
1622
1623static void nfs4_free_closedata(void *data)
1624{
1625 struct nfs4_closedata *calldata = data;
1626 struct nfs4_state_owner *sp = calldata->state->owner;
1627
1628 nfs4_put_open_state(calldata->state);
1629 nfs_free_seqid(calldata->arg.seqid);
1630 nfs4_put_state_owner(sp);
1631 path_put(&calldata->path);
1632 kfree(calldata);
1633}
1634
1635static void nfs4_close_done(struct rpc_task *task, void *data)
1636{
1637 struct nfs4_closedata *calldata = data;
1638 struct nfs4_state *state = calldata->state;
1639 struct nfs_server *server = NFS_SERVER(calldata->inode);
1640
1641 nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1642 if (RPC_ASSASSINATED(task))
1643 return;
1644 /* hmm. we are done with the inode, and in the process of freeing
1645 * the state_owner. we keep this around to process errors
1646 */
1647 switch (task->tk_status) {
1648 case 0:
1649 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1650 renew_lease(server, calldata->timestamp);
1651 break;
1652 case -NFS4ERR_STALE_STATEID:
1653 case -NFS4ERR_OLD_STATEID:
1654 case -NFS4ERR_BAD_STATEID:
1655 case -NFS4ERR_EXPIRED:
1656 if (calldata->arg.fmode == 0)
1657 break;
1658 default:
1659 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1660 rpc_restart_call(task);
1661 return;
1662 }
1663 }
1664 nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1665 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1666}
1667
1668static void nfs4_close_prepare(struct rpc_task *task, void *data)
1669{
1670 struct nfs4_closedata *calldata = data;
1671 struct nfs4_state *state = calldata->state;
1672 int clear_rd, clear_wr, clear_rdwr;
1673
1674 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1675 return;
1676
1677 clear_rd = clear_wr = clear_rdwr = 0;
1678 spin_lock(&state->owner->so_lock);
1679 /* Calculate the change in open mode */
1680 if (state->n_rdwr == 0) {
1681 if (state->n_rdonly == 0) {
1682 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1683 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1684 }
1685 if (state->n_wronly == 0) {
1686 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1687 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1688 }
1689 }
1690 spin_unlock(&state->owner->so_lock);
1691 if (!clear_rd && !clear_wr && !clear_rdwr) {
1692 /* Note: exit _without_ calling nfs4_close_done */
1693 task->tk_action = NULL;
1694 return;
1695 }
1696 nfs_fattr_init(calldata->res.fattr);
1697 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1698 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1699 calldata->arg.fmode = FMODE_READ;
1700 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1701 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1702 calldata->arg.fmode = FMODE_WRITE;
1703 }
1704 calldata->timestamp = jiffies;
1705 if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1706 &calldata->arg.seq_args, &calldata->res.seq_res,
1707 1, task))
1708 return;
1709 rpc_call_start(task);
1710}
1711
1712static const struct rpc_call_ops nfs4_close_ops = {
1713 .rpc_call_prepare = nfs4_close_prepare,
1714 .rpc_call_done = nfs4_close_done,
1715 .rpc_release = nfs4_free_closedata,
1716};
1717
1718/*
1719 * It is possible for data to be read/written from a mem-mapped file
1720 * after the sys_close call (which hits the vfs layer as a flush).
1721 * This means that we can't safely call nfsv4 close on a file until
1722 * the inode is cleared. This in turn means that we are not good
1723 * NFSv4 citizens - we do not indicate to the server to update the file's
1724 * share state even when we are done with one of the three share
1725 * stateid's in the inode.
1726 *
1727 * NOTE: Caller must be holding the sp->so_owner semaphore!
1728 */
1729int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1730{
1731 struct nfs_server *server = NFS_SERVER(state->inode);
1732 struct nfs4_closedata *calldata;
1733 struct nfs4_state_owner *sp = state->owner;
1734 struct rpc_task *task;
1735 struct rpc_message msg = {
1736 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1737 .rpc_cred = state->owner->so_cred,
1738 };
1739 struct rpc_task_setup task_setup_data = {
1740 .rpc_client = server->client,
1741 .rpc_message = &msg,
1742 .callback_ops = &nfs4_close_ops,
1743 .workqueue = nfsiod_workqueue,
1744 .flags = RPC_TASK_ASYNC,
1745 };
1746 int status = -ENOMEM;
1747
1748 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1749 if (calldata == NULL)
1750 goto out;
1751 calldata->inode = state->inode;
1752 calldata->state = state;
1753 calldata->arg.fh = NFS_FH(state->inode);
1754 calldata->arg.stateid = &state->open_stateid;
1755 /* Serialization for the sequence id */
1756 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1757 if (calldata->arg.seqid == NULL)
1758 goto out_free_calldata;
1759 calldata->arg.fmode = 0;
1760 calldata->arg.bitmask = server->cache_consistency_bitmask;
1761 calldata->res.fattr = &calldata->fattr;
1762 calldata->res.seqid = calldata->arg.seqid;
1763 calldata->res.server = server;
1764 calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1765 calldata->path.mnt = mntget(path->mnt);
1766 calldata->path.dentry = dget(path->dentry);
1767
1768 msg.rpc_argp = &calldata->arg,
1769 msg.rpc_resp = &calldata->res,
1770 task_setup_data.callback_data = calldata;
1771 task = rpc_run_task(&task_setup_data);
1772 if (IS_ERR(task))
1773 return PTR_ERR(task);
1774 status = 0;
1775 if (wait)
1776 status = rpc_wait_for_completion_task(task);
1777 rpc_put_task(task);
1778 return status;
1779out_free_calldata:
1780 kfree(calldata);
1781out:
1782 nfs4_put_open_state(state);
1783 nfs4_put_state_owner(sp);
1784 return status;
1785}
1786
1787static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1788{
1789 struct file *filp;
1790 int ret;
1791
1792 /* If the open_intent is for execute, we have an extra check to make */
1793 if (fmode & FMODE_EXEC) {
1794 ret = nfs_may_open(state->inode,
1795 state->owner->so_cred,
1796 nd->intent.open.flags);
1797 if (ret < 0)
1798 goto out_close;
1799 }
1800 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1801 if (!IS_ERR(filp)) {
1802 struct nfs_open_context *ctx;
1803 ctx = nfs_file_open_context(filp);
1804 ctx->state = state;
1805 return 0;
1806 }
1807 ret = PTR_ERR(filp);
1808out_close:
1809 nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1810 return ret;
1811}
1812
1813struct dentry *
1814nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1815{
1816 struct path path = {
1817 .mnt = nd->path.mnt,
1818 .dentry = dentry,
1819 };
1820 struct dentry *parent;
1821 struct iattr attr;
1822 struct rpc_cred *cred;
1823 struct nfs4_state *state;
1824 struct dentry *res;
1825 fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1826
1827 if (nd->flags & LOOKUP_CREATE) {
1828 attr.ia_mode = nd->intent.open.create_mode;
1829 attr.ia_valid = ATTR_MODE;
1830 if (!IS_POSIXACL(dir))
1831 attr.ia_mode &= ~current_umask();
1832 } else {
1833 attr.ia_valid = 0;
1834 BUG_ON(nd->intent.open.flags & O_CREAT);
1835 }
1836
1837 cred = rpc_lookup_cred();
1838 if (IS_ERR(cred))
1839 return (struct dentry *)cred;
1840 parent = dentry->d_parent;
1841 /* Protect against concurrent sillydeletes */
1842 nfs_block_sillyrename(parent);
1843 state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1844 put_rpccred(cred);
1845 if (IS_ERR(state)) {
1846 if (PTR_ERR(state) == -ENOENT) {
1847 d_add(dentry, NULL);
1848 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1849 }
1850 nfs_unblock_sillyrename(parent);
1851 return (struct dentry *)state;
1852 }
1853 res = d_add_unique(dentry, igrab(state->inode));
1854 if (res != NULL)
1855 path.dentry = res;
1856 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1857 nfs_unblock_sillyrename(parent);
1858 nfs4_intent_set_file(nd, &path, state, fmode);
1859 return res;
1860}
1861
1862int
1863nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1864{
1865 struct path path = {
1866 .mnt = nd->path.mnt,
1867 .dentry = dentry,
1868 };
1869 struct rpc_cred *cred;
1870 struct nfs4_state *state;
1871 fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1872
1873 cred = rpc_lookup_cred();
1874 if (IS_ERR(cred))
1875 return PTR_ERR(cred);
1876 state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1877 put_rpccred(cred);
1878 if (IS_ERR(state)) {
1879 switch (PTR_ERR(state)) {
1880 case -EPERM:
1881 case -EACCES:
1882 case -EDQUOT:
1883 case -ENOSPC:
1884 case -EROFS:
1885 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1886 return 1;
1887 default:
1888 goto out_drop;
1889 }
1890 }
1891 if (state->inode == dentry->d_inode) {
1892 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1893 nfs4_intent_set_file(nd, &path, state, fmode);
1894 return 1;
1895 }
1896 nfs4_close_sync(&path, state, fmode);
1897out_drop:
1898 d_drop(dentry);
1899 return 0;
1900}
1901
1902void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1903{
1904 if (ctx->state == NULL)
1905 return;
1906 if (is_sync)
1907 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1908 else
1909 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1910}
1911
1912static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1913{
1914 struct nfs4_server_caps_arg args = {
1915 .fhandle = fhandle,
1916 };
1917 struct nfs4_server_caps_res res = {};
1918 struct rpc_message msg = {
1919 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1920 .rpc_argp = &args,
1921 .rpc_resp = &res,
1922 };
1923 int status;
1924
1925 status = nfs4_call_sync(server, &msg, &args, &res, 0);
1926 if (status == 0) {
1927 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1928 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1929 server->caps |= NFS_CAP_ACLS;
1930 if (res.has_links != 0)
1931 server->caps |= NFS_CAP_HARDLINKS;
1932 if (res.has_symlinks != 0)
1933 server->caps |= NFS_CAP_SYMLINKS;
1934 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
1935 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
1936 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1937 server->acl_bitmask = res.acl_bitmask;
1938 }
1939
1940 return status;
1941}
1942
1943int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1944{
1945 struct nfs4_exception exception = { };
1946 int err;
1947 do {
1948 err = nfs4_handle_exception(server,
1949 _nfs4_server_capabilities(server, fhandle),
1950 &exception);
1951 } while (exception.retry);
1952 return err;
1953}
1954
1955static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1956 struct nfs_fsinfo *info)
1957{
1958 struct nfs4_lookup_root_arg args = {
1959 .bitmask = nfs4_fattr_bitmap,
1960 };
1961 struct nfs4_lookup_res res = {
1962 .server = server,
1963 .fattr = info->fattr,
1964 .fh = fhandle,
1965 };
1966 struct rpc_message msg = {
1967 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1968 .rpc_argp = &args,
1969 .rpc_resp = &res,
1970 };
1971 nfs_fattr_init(info->fattr);
1972 return nfs4_call_sync(server, &msg, &args, &res, 0);
1973}
1974
1975static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1976 struct nfs_fsinfo *info)
1977{
1978 struct nfs4_exception exception = { };
1979 int err;
1980 do {
1981 err = nfs4_handle_exception(server,
1982 _nfs4_lookup_root(server, fhandle, info),
1983 &exception);
1984 } while (exception.retry);
1985 return err;
1986}
1987
1988/*
1989 * get the file handle for the "/" directory on the server
1990 */
1991static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1992 struct nfs_fsinfo *info)
1993{
1994 int status;
1995
1996 status = nfs4_lookup_root(server, fhandle, info);
1997 if (status == 0)
1998 status = nfs4_server_capabilities(server, fhandle);
1999 if (status == 0)
2000 status = nfs4_do_fsinfo(server, fhandle, info);
2001 return nfs4_map_errors(status);
2002}
2003
2004/*
2005 * Get locations and (maybe) other attributes of a referral.
2006 * Note that we'll actually follow the referral later when
2007 * we detect fsid mismatch in inode revalidation
2008 */
2009static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2010{
2011 int status = -ENOMEM;
2012 struct page *page = NULL;
2013 struct nfs4_fs_locations *locations = NULL;
2014
2015 page = alloc_page(GFP_KERNEL);
2016 if (page == NULL)
2017 goto out;
2018 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2019 if (locations == NULL)
2020 goto out;
2021
2022 status = nfs4_proc_fs_locations(dir, name, locations, page);
2023 if (status != 0)
2024 goto out;
2025 /* Make sure server returned a different fsid for the referral */
2026 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2027 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2028 status = -EIO;
2029 goto out;
2030 }
2031
2032 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2033 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2034 if (!fattr->mode)
2035 fattr->mode = S_IFDIR;
2036 memset(fhandle, 0, sizeof(struct nfs_fh));
2037out:
2038 if (page)
2039 __free_page(page);
2040 if (locations)
2041 kfree(locations);
2042 return status;
2043}
2044
2045static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2046{
2047 struct nfs4_getattr_arg args = {
2048 .fh = fhandle,
2049 .bitmask = server->attr_bitmask,
2050 };
2051 struct nfs4_getattr_res res = {
2052 .fattr = fattr,
2053 .server = server,
2054 };
2055 struct rpc_message msg = {
2056 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2057 .rpc_argp = &args,
2058 .rpc_resp = &res,
2059 };
2060
2061 nfs_fattr_init(fattr);
2062 return nfs4_call_sync(server, &msg, &args, &res, 0);
2063}
2064
2065static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2066{
2067 struct nfs4_exception exception = { };
2068 int err;
2069 do {
2070 err = nfs4_handle_exception(server,
2071 _nfs4_proc_getattr(server, fhandle, fattr),
2072 &exception);
2073 } while (exception.retry);
2074 return err;
2075}
2076
2077/*
2078 * The file is not closed if it is opened due to the a request to change
2079 * the size of the file. The open call will not be needed once the
2080 * VFS layer lookup-intents are implemented.
2081 *
2082 * Close is called when the inode is destroyed.
2083 * If we haven't opened the file for O_WRONLY, we
2084 * need to in the size_change case to obtain a stateid.
2085 *
2086 * Got race?
2087 * Because OPEN is always done by name in nfsv4, it is
2088 * possible that we opened a different file by the same
2089 * name. We can recognize this race condition, but we
2090 * can't do anything about it besides returning an error.
2091 *
2092 * This will be fixed with VFS changes (lookup-intent).
2093 */
2094static int
2095nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2096 struct iattr *sattr)
2097{
2098 struct inode *inode = dentry->d_inode;
2099 struct rpc_cred *cred = NULL;
2100 struct nfs4_state *state = NULL;
2101 int status;
2102
2103 nfs_fattr_init(fattr);
2104
2105 /* Search for an existing open(O_WRITE) file */
2106 if (sattr->ia_valid & ATTR_FILE) {
2107 struct nfs_open_context *ctx;
2108
2109 ctx = nfs_file_open_context(sattr->ia_file);
2110 if (ctx) {
2111 cred = ctx->cred;
2112 state = ctx->state;
2113 }
2114 }
2115
2116 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2117 if (status == 0)
2118 nfs_setattr_update_inode(inode, sattr);
2119 return status;
2120}
2121
2122static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2123 const struct qstr *name, struct nfs_fh *fhandle,
2124 struct nfs_fattr *fattr)
2125{
2126 int status;
2127 struct nfs4_lookup_arg args = {
2128 .bitmask = server->attr_bitmask,
2129 .dir_fh = dirfh,
2130 .name = name,
2131 };
2132 struct nfs4_lookup_res res = {
2133 .server = server,
2134 .fattr = fattr,
2135 .fh = fhandle,
2136 };
2137 struct rpc_message msg = {
2138 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2139 .rpc_argp = &args,
2140 .rpc_resp = &res,
2141 };
2142
2143 nfs_fattr_init(fattr);
2144
2145 dprintk("NFS call lookupfh %s\n", name->name);
2146 status = nfs4_call_sync(server, &msg, &args, &res, 0);
2147 dprintk("NFS reply lookupfh: %d\n", status);
2148 return status;
2149}
2150
2151static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2152 struct qstr *name, struct nfs_fh *fhandle,
2153 struct nfs_fattr *fattr)
2154{
2155 struct nfs4_exception exception = { };
2156 int err;
2157 do {
2158 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2159 /* FIXME: !!!! */
2160 if (err == -NFS4ERR_MOVED) {
2161 err = -EREMOTE;
2162 break;
2163 }
2164 err = nfs4_handle_exception(server, err, &exception);
2165 } while (exception.retry);
2166 return err;
2167}
2168
2169static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2170 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2171{
2172 int status;
2173
2174 dprintk("NFS call lookup %s\n", name->name);
2175 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2176 if (status == -NFS4ERR_MOVED)
2177 status = nfs4_get_referral(dir, name, fattr, fhandle);
2178 dprintk("NFS reply lookup: %d\n", status);
2179 return status;
2180}
2181
2182static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2183{
2184 struct nfs4_exception exception = { };
2185 int err;
2186 do {
2187 err = nfs4_handle_exception(NFS_SERVER(dir),
2188 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2189 &exception);
2190 } while (exception.retry);
2191 return err;
2192}
2193
2194static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2195{
2196 struct nfs_server *server = NFS_SERVER(inode);
2197 struct nfs_fattr fattr;
2198 struct nfs4_accessargs args = {
2199 .fh = NFS_FH(inode),
2200 .bitmask = server->attr_bitmask,
2201 };
2202 struct nfs4_accessres res = {
2203 .server = server,
2204 .fattr = &fattr,
2205 };
2206 struct rpc_message msg = {
2207 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2208 .rpc_argp = &args,
2209 .rpc_resp = &res,
2210 .rpc_cred = entry->cred,
2211 };
2212 int mode = entry->mask;
2213 int status;
2214
2215 /*
2216 * Determine which access bits we want to ask for...
2217 */
2218 if (mode & MAY_READ)
2219 args.access |= NFS4_ACCESS_READ;
2220 if (S_ISDIR(inode->i_mode)) {
2221 if (mode & MAY_WRITE)
2222 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2223 if (mode & MAY_EXEC)
2224 args.access |= NFS4_ACCESS_LOOKUP;
2225 } else {
2226 if (mode & MAY_WRITE)
2227 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2228 if (mode & MAY_EXEC)
2229 args.access |= NFS4_ACCESS_EXECUTE;
2230 }
2231 nfs_fattr_init(&fattr);
2232 status = nfs4_call_sync(server, &msg, &args, &res, 0);
2233 if (!status) {
2234 entry->mask = 0;
2235 if (res.access & NFS4_ACCESS_READ)
2236 entry->mask |= MAY_READ;
2237 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2238 entry->mask |= MAY_WRITE;
2239 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2240 entry->mask |= MAY_EXEC;
2241 nfs_refresh_inode(inode, &fattr);
2242 }
2243 return status;
2244}
2245
2246static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2247{
2248 struct nfs4_exception exception = { };
2249 int err;
2250 do {
2251 err = nfs4_handle_exception(NFS_SERVER(inode),
2252 _nfs4_proc_access(inode, entry),
2253 &exception);
2254 } while (exception.retry);
2255 return err;
2256}
2257
2258/*
2259 * TODO: For the time being, we don't try to get any attributes
2260 * along with any of the zero-copy operations READ, READDIR,
2261 * READLINK, WRITE.
2262 *
2263 * In the case of the first three, we want to put the GETATTR
2264 * after the read-type operation -- this is because it is hard
2265 * to predict the length of a GETATTR response in v4, and thus
2266 * align the READ data correctly. This means that the GETATTR
2267 * may end up partially falling into the page cache, and we should
2268 * shift it into the 'tail' of the xdr_buf before processing.
2269 * To do this efficiently, we need to know the total length
2270 * of data received, which doesn't seem to be available outside
2271 * of the RPC layer.
2272 *
2273 * In the case of WRITE, we also want to put the GETATTR after
2274 * the operation -- in this case because we want to make sure
2275 * we get the post-operation mtime and size. This means that
2276 * we can't use xdr_encode_pages() as written: we need a variant
2277 * of it which would leave room in the 'tail' iovec.
2278 *
2279 * Both of these changes to the XDR layer would in fact be quite
2280 * minor, but I decided to leave them for a subsequent patch.
2281 */
2282static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2283 unsigned int pgbase, unsigned int pglen)
2284{
2285 struct nfs4_readlink args = {
2286 .fh = NFS_FH(inode),
2287 .pgbase = pgbase,
2288 .pglen = pglen,
2289 .pages = &page,
2290 };
2291 struct nfs4_readlink_res res;
2292 struct rpc_message msg = {
2293 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2294 .rpc_argp = &args,
2295 .rpc_resp = &res,
2296 };
2297
2298 return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2299}
2300
2301static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2302 unsigned int pgbase, unsigned int pglen)
2303{
2304 struct nfs4_exception exception = { };
2305 int err;
2306 do {
2307 err = nfs4_handle_exception(NFS_SERVER(inode),
2308 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2309 &exception);
2310 } while (exception.retry);
2311 return err;
2312}
2313
2314/*
2315 * Got race?
2316 * We will need to arrange for the VFS layer to provide an atomic open.
2317 * Until then, this create/open method is prone to inefficiency and race
2318 * conditions due to the lookup, create, and open VFS calls from sys_open()
2319 * placed on the wire.
2320 *
2321 * Given the above sorry state of affairs, I'm simply sending an OPEN.
2322 * The file will be opened again in the subsequent VFS open call
2323 * (nfs4_proc_file_open).
2324 *
2325 * The open for read will just hang around to be used by any process that
2326 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2327 */
2328
2329static int
2330nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2331 int flags, struct nameidata *nd)
2332{
2333 struct path path = {
2334 .mnt = nd->path.mnt,
2335 .dentry = dentry,
2336 };
2337 struct nfs4_state *state;
2338 struct rpc_cred *cred;
2339 fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2340 int status = 0;
2341
2342 cred = rpc_lookup_cred();
2343 if (IS_ERR(cred)) {
2344 status = PTR_ERR(cred);
2345 goto out;
2346 }
2347 state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2348 d_drop(dentry);
2349 if (IS_ERR(state)) {
2350 status = PTR_ERR(state);
2351 goto out_putcred;
2352 }
2353 d_add(dentry, igrab(state->inode));
2354 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2355 if (flags & O_EXCL) {
2356 struct nfs_fattr fattr;
2357 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2358 if (status == 0)
2359 nfs_setattr_update_inode(state->inode, sattr);
2360 nfs_post_op_update_inode(state->inode, &fattr);
2361 }
2362 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2363 status = nfs4_intent_set_file(nd, &path, state, fmode);
2364 else
2365 nfs4_close_sync(&path, state, fmode);
2366out_putcred:
2367 put_rpccred(cred);
2368out:
2369 return status;
2370}
2371
2372static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2373{
2374 struct nfs_server *server = NFS_SERVER(dir);
2375 struct nfs_removeargs args = {
2376 .fh = NFS_FH(dir),
2377 .name.len = name->len,
2378 .name.name = name->name,
2379 .bitmask = server->attr_bitmask,
2380 };
2381 struct nfs_removeres res = {
2382 .server = server,
2383 };
2384 struct rpc_message msg = {
2385 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2386 .rpc_argp = &args,
2387 .rpc_resp = &res,
2388 };
2389 int status;
2390
2391 nfs_fattr_init(&res.dir_attr);
2392 status = nfs4_call_sync(server, &msg, &args, &res, 1);
2393 if (status == 0) {
2394 update_changeattr(dir, &res.cinfo);
2395 nfs_post_op_update_inode(dir, &res.dir_attr);
2396 }
2397 return status;
2398}
2399
2400static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2401{
2402 struct nfs4_exception exception = { };
2403 int err;
2404 do {
2405 err = nfs4_handle_exception(NFS_SERVER(dir),
2406 _nfs4_proc_remove(dir, name),
2407 &exception);
2408 } while (exception.retry);
2409 return err;
2410}
2411
2412static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2413{
2414 struct nfs_server *server = NFS_SERVER(dir);
2415 struct nfs_removeargs *args = msg->rpc_argp;
2416 struct nfs_removeres *res = msg->rpc_resp;
2417
2418 args->bitmask = server->cache_consistency_bitmask;
2419 res->server = server;
2420 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2421}
2422
2423static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2424{
2425 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2426
2427 nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2428 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2429 return 0;
2430 nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2431 update_changeattr(dir, &res->cinfo);
2432 nfs_post_op_update_inode(dir, &res->dir_attr);
2433 return 1;
2434}
2435
2436static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2437 struct inode *new_dir, struct qstr *new_name)
2438{
2439 struct nfs_server *server = NFS_SERVER(old_dir);
2440 struct nfs4_rename_arg arg = {
2441 .old_dir = NFS_FH(old_dir),
2442 .new_dir = NFS_FH(new_dir),
2443 .old_name = old_name,
2444 .new_name = new_name,
2445 .bitmask = server->attr_bitmask,
2446 };
2447 struct nfs_fattr old_fattr, new_fattr;
2448 struct nfs4_rename_res res = {
2449 .server = server,
2450 .old_fattr = &old_fattr,
2451 .new_fattr = &new_fattr,
2452 };
2453 struct rpc_message msg = {
2454 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2455 .rpc_argp = &arg,
2456 .rpc_resp = &res,
2457 };
2458 int status;
2459
2460 nfs_fattr_init(res.old_fattr);
2461 nfs_fattr_init(res.new_fattr);
2462 status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2463
2464 if (!status) {
2465 update_changeattr(old_dir, &res.old_cinfo);
2466 nfs_post_op_update_inode(old_dir, res.old_fattr);
2467 update_changeattr(new_dir, &res.new_cinfo);
2468 nfs_post_op_update_inode(new_dir, res.new_fattr);
2469 }
2470 return status;
2471}
2472
2473static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2474 struct inode *new_dir, struct qstr *new_name)
2475{
2476 struct nfs4_exception exception = { };
2477 int err;
2478 do {
2479 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2480 _nfs4_proc_rename(old_dir, old_name,
2481 new_dir, new_name),
2482 &exception);
2483 } while (exception.retry);
2484 return err;
2485}
2486
2487static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2488{
2489 struct nfs_server *server = NFS_SERVER(inode);
2490 struct nfs4_link_arg arg = {
2491 .fh = NFS_FH(inode),
2492 .dir_fh = NFS_FH(dir),
2493 .name = name,
2494 .bitmask = server->attr_bitmask,
2495 };
2496 struct nfs_fattr fattr, dir_attr;
2497 struct nfs4_link_res res = {
2498 .server = server,
2499 .fattr = &fattr,
2500 .dir_attr = &dir_attr,
2501 };
2502 struct rpc_message msg = {
2503 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2504 .rpc_argp = &arg,
2505 .rpc_resp = &res,
2506 };
2507 int status;
2508
2509 nfs_fattr_init(res.fattr);
2510 nfs_fattr_init(res.dir_attr);
2511 status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2512 if (!status) {
2513 update_changeattr(dir, &res.cinfo);
2514 nfs_post_op_update_inode(dir, res.dir_attr);
2515 nfs_post_op_update_inode(inode, res.fattr);
2516 }
2517
2518 return status;
2519}
2520
2521static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2522{
2523 struct nfs4_exception exception = { };
2524 int err;
2525 do {
2526 err = nfs4_handle_exception(NFS_SERVER(inode),
2527 _nfs4_proc_link(inode, dir, name),
2528 &exception);
2529 } while (exception.retry);
2530 return err;
2531}
2532
2533struct nfs4_createdata {
2534 struct rpc_message msg;
2535 struct nfs4_create_arg arg;
2536 struct nfs4_create_res res;
2537 struct nfs_fh fh;
2538 struct nfs_fattr fattr;
2539 struct nfs_fattr dir_fattr;
2540};
2541
2542static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2543 struct qstr *name, struct iattr *sattr, u32 ftype)
2544{
2545 struct nfs4_createdata *data;
2546
2547 data = kzalloc(sizeof(*data), GFP_KERNEL);
2548 if (data != NULL) {
2549 struct nfs_server *server = NFS_SERVER(dir);
2550
2551 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2552 data->msg.rpc_argp = &data->arg;
2553 data->msg.rpc_resp = &data->res;
2554 data->arg.dir_fh = NFS_FH(dir);
2555 data->arg.server = server;
2556 data->arg.name = name;
2557 data->arg.attrs = sattr;
2558 data->arg.ftype = ftype;
2559 data->arg.bitmask = server->attr_bitmask;
2560 data->res.server = server;
2561 data->res.fh = &data->fh;
2562 data->res.fattr = &data->fattr;
2563 data->res.dir_fattr = &data->dir_fattr;
2564 nfs_fattr_init(data->res.fattr);
2565 nfs_fattr_init(data->res.dir_fattr);
2566 }
2567 return data;
2568}
2569
2570static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2571{
2572 int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2573 &data->arg, &data->res, 1);
2574 if (status == 0) {
2575 update_changeattr(dir, &data->res.dir_cinfo);
2576 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2577 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2578 }
2579 return status;
2580}
2581
2582static void nfs4_free_createdata(struct nfs4_createdata *data)
2583{
2584 kfree(data);
2585}
2586
2587static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2588 struct page *page, unsigned int len, struct iattr *sattr)
2589{
2590 struct nfs4_createdata *data;
2591 int status = -ENAMETOOLONG;
2592
2593 if (len > NFS4_MAXPATHLEN)
2594 goto out;
2595
2596 status = -ENOMEM;
2597 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2598 if (data == NULL)
2599 goto out;
2600
2601 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2602 data->arg.u.symlink.pages = &page;
2603 data->arg.u.symlink.len = len;
2604
2605 status = nfs4_do_create(dir, dentry, data);
2606
2607 nfs4_free_createdata(data);
2608out:
2609 return status;
2610}
2611
2612static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2613 struct page *page, unsigned int len, struct iattr *sattr)
2614{
2615 struct nfs4_exception exception = { };
2616 int err;
2617 do {
2618 err = nfs4_handle_exception(NFS_SERVER(dir),
2619 _nfs4_proc_symlink(dir, dentry, page,
2620 len, sattr),
2621 &exception);
2622 } while (exception.retry);
2623 return err;
2624}
2625
2626static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2627 struct iattr *sattr)
2628{
2629 struct nfs4_createdata *data;
2630 int status = -ENOMEM;
2631
2632 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2633 if (data == NULL)
2634 goto out;
2635
2636 status = nfs4_do_create(dir, dentry, data);
2637
2638 nfs4_free_createdata(data);
2639out:
2640 return status;
2641}
2642
2643static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2644 struct iattr *sattr)
2645{
2646 struct nfs4_exception exception = { };
2647 int err;
2648 do {
2649 err = nfs4_handle_exception(NFS_SERVER(dir),
2650 _nfs4_proc_mkdir(dir, dentry, sattr),
2651 &exception);
2652 } while (exception.retry);
2653 return err;
2654}
2655
2656static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2657 u64 cookie, struct page *page, unsigned int count, int plus)
2658{
2659 struct inode *dir = dentry->d_inode;
2660 struct nfs4_readdir_arg args = {
2661 .fh = NFS_FH(dir),
2662 .pages = &page,
2663 .pgbase = 0,
2664 .count = count,
2665 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2666 };
2667 struct nfs4_readdir_res res;
2668 struct rpc_message msg = {
2669 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2670 .rpc_argp = &args,
2671 .rpc_resp = &res,
2672 .rpc_cred = cred,
2673 };
2674 int status;
2675
2676 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2677 dentry->d_parent->d_name.name,
2678 dentry->d_name.name,
2679 (unsigned long long)cookie);
2680 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2681 res.pgbase = args.pgbase;
2682 status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2683 if (status == 0)
2684 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2685
2686 nfs_invalidate_atime(dir);
2687
2688 dprintk("%s: returns %d\n", __func__, status);
2689 return status;
2690}
2691
2692static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2693 u64 cookie, struct page *page, unsigned int count, int plus)
2694{
2695 struct nfs4_exception exception = { };
2696 int err;
2697 do {
2698 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2699 _nfs4_proc_readdir(dentry, cred, cookie,
2700 page, count, plus),
2701 &exception);
2702 } while (exception.retry);
2703 return err;
2704}
2705
2706static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2707 struct iattr *sattr, dev_t rdev)
2708{
2709 struct nfs4_createdata *data;
2710 int mode = sattr->ia_mode;
2711 int status = -ENOMEM;
2712
2713 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2714 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2715
2716 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2717 if (data == NULL)
2718 goto out;
2719
2720 if (S_ISFIFO(mode))
2721 data->arg.ftype = NF4FIFO;
2722 else if (S_ISBLK(mode)) {
2723 data->arg.ftype = NF4BLK;
2724 data->arg.u.device.specdata1 = MAJOR(rdev);
2725 data->arg.u.device.specdata2 = MINOR(rdev);
2726 }
2727 else if (S_ISCHR(mode)) {
2728 data->arg.ftype = NF4CHR;
2729 data->arg.u.device.specdata1 = MAJOR(rdev);
2730 data->arg.u.device.specdata2 = MINOR(rdev);
2731 }
2732
2733 status = nfs4_do_create(dir, dentry, data);
2734
2735 nfs4_free_createdata(data);
2736out:
2737 return status;
2738}
2739
2740static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2741 struct iattr *sattr, dev_t rdev)
2742{
2743 struct nfs4_exception exception = { };
2744 int err;
2745 do {
2746 err = nfs4_handle_exception(NFS_SERVER(dir),
2747 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2748 &exception);
2749 } while (exception.retry);
2750 return err;
2751}
2752
2753static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2754 struct nfs_fsstat *fsstat)
2755{
2756 struct nfs4_statfs_arg args = {
2757 .fh = fhandle,
2758 .bitmask = server->attr_bitmask,
2759 };
2760 struct nfs4_statfs_res res = {
2761 .fsstat = fsstat,
2762 };
2763 struct rpc_message msg = {
2764 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2765 .rpc_argp = &args,
2766 .rpc_resp = &res,
2767 };
2768
2769 nfs_fattr_init(fsstat->fattr);
2770 return nfs4_call_sync(server, &msg, &args, &res, 0);
2771}
2772
2773static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2774{
2775 struct nfs4_exception exception = { };
2776 int err;
2777 do {
2778 err = nfs4_handle_exception(server,
2779 _nfs4_proc_statfs(server, fhandle, fsstat),
2780 &exception);
2781 } while (exception.retry);
2782 return err;
2783}
2784
2785static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2786 struct nfs_fsinfo *fsinfo)
2787{
2788 struct nfs4_fsinfo_arg args = {
2789 .fh = fhandle,
2790 .bitmask = server->attr_bitmask,
2791 };
2792 struct nfs4_fsinfo_res res = {
2793 .fsinfo = fsinfo,
2794 };
2795 struct rpc_message msg = {
2796 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2797 .rpc_argp = &args,
2798 .rpc_resp = &res,
2799 };
2800
2801 return nfs4_call_sync(server, &msg, &args, &res, 0);
2802}
2803
2804static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2805{
2806 struct nfs4_exception exception = { };
2807 int err;
2808
2809 do {
2810 err = nfs4_handle_exception(server,
2811 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2812 &exception);
2813 } while (exception.retry);
2814 return err;
2815}
2816
2817static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2818{
2819 nfs_fattr_init(fsinfo->fattr);
2820 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2821}
2822
2823static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2824 struct nfs_pathconf *pathconf)
2825{
2826 struct nfs4_pathconf_arg args = {
2827 .fh = fhandle,
2828 .bitmask = server->attr_bitmask,
2829 };
2830 struct nfs4_pathconf_res res = {
2831 .pathconf = pathconf,
2832 };
2833 struct rpc_message msg = {
2834 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2835 .rpc_argp = &args,
2836 .rpc_resp = &res,
2837 };
2838
2839 /* None of the pathconf attributes are mandatory to implement */
2840 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2841 memset(pathconf, 0, sizeof(*pathconf));
2842 return 0;
2843 }
2844
2845 nfs_fattr_init(pathconf->fattr);
2846 return nfs4_call_sync(server, &msg, &args, &res, 0);
2847}
2848
2849static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2850 struct nfs_pathconf *pathconf)
2851{
2852 struct nfs4_exception exception = { };
2853 int err;
2854
2855 do {
2856 err = nfs4_handle_exception(server,
2857 _nfs4_proc_pathconf(server, fhandle, pathconf),
2858 &exception);
2859 } while (exception.retry);
2860 return err;
2861}
2862
2863static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2864{
2865 struct nfs_server *server = NFS_SERVER(data->inode);
2866
2867 dprintk("--> %s\n", __func__);
2868
2869 /* nfs4_sequence_free_slot called in the read rpc_call_done */
2870 nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2871
2872 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2873 rpc_restart_call(task);
2874 return -EAGAIN;
2875 }
2876
2877 nfs_invalidate_atime(data->inode);
2878 if (task->tk_status > 0)
2879 renew_lease(server, data->timestamp);
2880 return 0;
2881}
2882
2883static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2884{
2885 data->timestamp = jiffies;
2886 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2887}
2888
2889static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2890{
2891 struct inode *inode = data->inode;
2892
2893 /* slot is freed in nfs_writeback_done */
2894 nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2895 task->tk_status);
2896
2897 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2898 rpc_restart_call(task);
2899 return -EAGAIN;
2900 }
2901 if (task->tk_status >= 0) {
2902 renew_lease(NFS_SERVER(inode), data->timestamp);
2903 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2904 }
2905 return 0;
2906}
2907
2908static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2909{
2910 struct nfs_server *server = NFS_SERVER(data->inode);
2911
2912 data->args.bitmask = server->cache_consistency_bitmask;
2913 data->res.server = server;
2914 data->timestamp = jiffies;
2915
2916 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2917}
2918
2919static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2920{
2921 struct inode *inode = data->inode;
2922
2923 nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2924 task->tk_status);
2925 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2926 rpc_restart_call(task);
2927 return -EAGAIN;
2928 }
2929 nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
2930 &data->res.seq_res);
2931 nfs_refresh_inode(inode, data->res.fattr);
2932 return 0;
2933}
2934
2935static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2936{
2937 struct nfs_server *server = NFS_SERVER(data->inode);
2938
2939 data->args.bitmask = server->cache_consistency_bitmask;
2940 data->res.server = server;
2941 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2942}
2943
2944/*
2945 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2946 * standalone procedure for queueing an asynchronous RENEW.
2947 */
2948static void nfs4_renew_done(struct rpc_task *task, void *data)
2949{
2950 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2951 unsigned long timestamp = (unsigned long)data;
2952
2953 if (task->tk_status < 0) {
2954 /* Unless we're shutting down, schedule state recovery! */
2955 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
2956 nfs4_schedule_state_recovery(clp);
2957 return;
2958 }
2959 spin_lock(&clp->cl_lock);
2960 if (time_before(clp->cl_last_renewal,timestamp))
2961 clp->cl_last_renewal = timestamp;
2962 spin_unlock(&clp->cl_lock);
2963}
2964
2965static const struct rpc_call_ops nfs4_renew_ops = {
2966 .rpc_call_done = nfs4_renew_done,
2967};
2968
2969int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2970{
2971 struct rpc_message msg = {
2972 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2973 .rpc_argp = clp,
2974 .rpc_cred = cred,
2975 };
2976
2977 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2978 &nfs4_renew_ops, (void *)jiffies);
2979}
2980
2981int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2982{
2983 struct rpc_message msg = {
2984 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2985 .rpc_argp = clp,
2986 .rpc_cred = cred,
2987 };
2988 unsigned long now = jiffies;
2989 int status;
2990
2991 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2992 if (status < 0)
2993 return status;
2994 spin_lock(&clp->cl_lock);
2995 if (time_before(clp->cl_last_renewal,now))
2996 clp->cl_last_renewal = now;
2997 spin_unlock(&clp->cl_lock);
2998 return 0;
2999}
3000
3001static inline int nfs4_server_supports_acls(struct nfs_server *server)
3002{
3003 return (server->caps & NFS_CAP_ACLS)
3004 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3005 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3006}
3007
3008/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3009 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3010 * the stack.
3011 */
3012#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3013
3014static void buf_to_pages(const void *buf, size_t buflen,
3015 struct page **pages, unsigned int *pgbase)
3016{
3017 const void *p = buf;
3018
3019 *pgbase = offset_in_page(buf);
3020 p -= *pgbase;
3021 while (p < buf + buflen) {
3022 *(pages++) = virt_to_page(p);
3023 p += PAGE_CACHE_SIZE;
3024 }
3025}
3026
3027struct nfs4_cached_acl {
3028 int cached;
3029 size_t len;
3030 char data[0];
3031};
3032
3033static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3034{
3035 struct nfs_inode *nfsi = NFS_I(inode);
3036
3037 spin_lock(&inode->i_lock);
3038 kfree(nfsi->nfs4_acl);
3039 nfsi->nfs4_acl = acl;
3040 spin_unlock(&inode->i_lock);
3041}
3042
3043static void nfs4_zap_acl_attr(struct inode *inode)
3044{
3045 nfs4_set_cached_acl(inode, NULL);
3046}
3047
3048static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3049{
3050 struct nfs_inode *nfsi = NFS_I(inode);
3051 struct nfs4_cached_acl *acl;
3052 int ret = -ENOENT;
3053
3054 spin_lock(&inode->i_lock);
3055 acl = nfsi->nfs4_acl;
3056 if (acl == NULL)
3057 goto out;
3058 if (buf == NULL) /* user is just asking for length */
3059 goto out_len;
3060 if (acl->cached == 0)
3061 goto out;
3062 ret = -ERANGE; /* see getxattr(2) man page */
3063 if (acl->len > buflen)
3064 goto out;
3065 memcpy(buf, acl->data, acl->len);
3066out_len:
3067 ret = acl->len;
3068out:
3069 spin_unlock(&inode->i_lock);
3070 return ret;
3071}
3072
3073static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3074{
3075 struct nfs4_cached_acl *acl;
3076
3077 if (buf && acl_len <= PAGE_SIZE) {
3078 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3079 if (acl == NULL)
3080 goto out;
3081 acl->cached = 1;
3082 memcpy(acl->data, buf, acl_len);
3083 } else {
3084 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3085 if (acl == NULL)
3086 goto out;
3087 acl->cached = 0;
3088 }
3089 acl->len = acl_len;
3090out:
3091 nfs4_set_cached_acl(inode, acl);
3092}
3093
3094static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3095{
3096 struct page *pages[NFS4ACL_MAXPAGES];
3097 struct nfs_getaclargs args = {
3098 .fh = NFS_FH(inode),
3099 .acl_pages = pages,
3100 .acl_len = buflen,
3101 };
3102 struct nfs_getaclres res = {
3103 .acl_len = buflen,
3104 };
3105 void *resp_buf;
3106 struct rpc_message msg = {
3107 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3108 .rpc_argp = &args,
3109 .rpc_resp = &res,
3110 };
3111 struct page *localpage = NULL;
3112 int ret;
3113
3114 if (buflen < PAGE_SIZE) {
3115 /* As long as we're doing a round trip to the server anyway,
3116 * let's be prepared for a page of acl data. */
3117 localpage = alloc_page(GFP_KERNEL);
3118 resp_buf = page_address(localpage);
3119 if (localpage == NULL)
3120 return -ENOMEM;
3121 args.acl_pages[0] = localpage;
3122 args.acl_pgbase = 0;
3123 args.acl_len = PAGE_SIZE;
3124 } else {
3125 resp_buf = buf;
3126 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3127 }
3128 ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3129 if (ret)
3130 goto out_free;
3131 if (res.acl_len > args.acl_len)
3132 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3133 else
3134 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3135 if (buf) {
3136 ret = -ERANGE;
3137 if (res.acl_len > buflen)
3138 goto out_free;
3139 if (localpage)
3140 memcpy(buf, resp_buf, res.acl_len);
3141 }
3142 ret = res.acl_len;
3143out_free:
3144 if (localpage)
3145 __free_page(localpage);
3146 return ret;
3147}
3148
3149static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3150{
3151 struct nfs4_exception exception = { };
3152 ssize_t ret;
3153 do {
3154 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3155 if (ret >= 0)
3156 break;
3157 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3158 } while (exception.retry);
3159 return ret;
3160}
3161
3162static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3163{
3164 struct nfs_server *server = NFS_SERVER(inode);
3165 int ret;
3166
3167 if (!nfs4_server_supports_acls(server))
3168 return -EOPNOTSUPP;
3169 ret = nfs_revalidate_inode(server, inode);
3170 if (ret < 0)
3171 return ret;
3172 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3173 nfs_zap_acl_cache(inode);
3174 ret = nfs4_read_cached_acl(inode, buf, buflen);
3175 if (ret != -ENOENT)
3176 return ret;
3177 return nfs4_get_acl_uncached(inode, buf, buflen);
3178}
3179
3180static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3181{
3182 struct nfs_server *server = NFS_SERVER(inode);
3183 struct page *pages[NFS4ACL_MAXPAGES];
3184 struct nfs_setaclargs arg = {
3185 .fh = NFS_FH(inode),
3186 .acl_pages = pages,
3187 .acl_len = buflen,
3188 };
3189 struct nfs_setaclres res;
3190 struct rpc_message msg = {
3191 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3192 .rpc_argp = &arg,
3193 .rpc_resp = &res,
3194 };
3195 int ret;
3196
3197 if (!nfs4_server_supports_acls(server))
3198 return -EOPNOTSUPP;
3199 nfs_inode_return_delegation(inode);
3200 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3201 ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3202 nfs_access_zap_cache(inode);
3203 nfs_zap_acl_cache(inode);
3204 return ret;
3205}
3206
3207static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3208{
3209 struct nfs4_exception exception = { };
3210 int err;
3211 do {
3212 err = nfs4_handle_exception(NFS_SERVER(inode),
3213 __nfs4_proc_set_acl(inode, buf, buflen),
3214 &exception);
3215 } while (exception.retry);
3216 return err;
3217}
3218
3219static int
3220nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3221{
3222 struct nfs_client *clp = server->nfs_client;
3223
3224 if (!clp || task->tk_status >= 0)
3225 return 0;
3226 switch(task->tk_status) {
3227 case -NFS4ERR_ADMIN_REVOKED:
3228 case -NFS4ERR_BAD_STATEID:
3229 case -NFS4ERR_OPENMODE:
3230 if (state == NULL)
3231 break;
3232 nfs4_state_mark_reclaim_nograce(clp, state);
3233 case -NFS4ERR_STALE_CLIENTID:
3234 case -NFS4ERR_STALE_STATEID:
3235 case -NFS4ERR_EXPIRED:
3236 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3237 nfs4_schedule_state_recovery(clp);
3238 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3239 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3240 task->tk_status = 0;
3241 return -EAGAIN;
3242 case -NFS4ERR_DELAY:
3243 nfs_inc_server_stats(server, NFSIOS_DELAY);
3244 case -NFS4ERR_GRACE:
3245 rpc_delay(task, NFS4_POLL_RETRY_MAX);
3246 task->tk_status = 0;
3247 return -EAGAIN;
3248 case -NFS4ERR_OLD_STATEID:
3249 task->tk_status = 0;
3250 return -EAGAIN;
3251 }
3252 task->tk_status = nfs4_map_errors(task->tk_status);
3253 return 0;
3254}
3255
3256int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3257{
3258 nfs4_verifier sc_verifier;
3259 struct nfs4_setclientid setclientid = {
3260 .sc_verifier = &sc_verifier,
3261 .sc_prog = program,
3262 };
3263 struct rpc_message msg = {
3264 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3265 .rpc_argp = &setclientid,
3266 .rpc_resp = clp,
3267 .rpc_cred = cred,
3268 };
3269 __be32 *p;
3270 int loop = 0;
3271 int status;
3272
3273 p = (__be32*)sc_verifier.data;
3274 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3275 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3276
3277 for(;;) {
3278 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3279 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3280 clp->cl_ipaddr,
3281 rpc_peeraddr2str(clp->cl_rpcclient,
3282 RPC_DISPLAY_ADDR),
3283 rpc_peeraddr2str(clp->cl_rpcclient,
3284 RPC_DISPLAY_PROTO),
3285 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3286 clp->cl_id_uniquifier);
3287 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3288 sizeof(setclientid.sc_netid),
3289 rpc_peeraddr2str(clp->cl_rpcclient,
3290 RPC_DISPLAY_NETID));
3291 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3292 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3293 clp->cl_ipaddr, port >> 8, port & 255);
3294
3295 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3296 if (status != -NFS4ERR_CLID_INUSE)
3297 break;
3298 if (signalled())
3299 break;
3300 if (loop++ & 1)
3301 ssleep(clp->cl_lease_time + 1);
3302 else
3303 if (++clp->cl_id_uniquifier == 0)
3304 break;
3305 }
3306 return status;
3307}
3308
3309static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3310{
3311 struct nfs_fsinfo fsinfo;
3312 struct rpc_message msg = {
3313 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3314 .rpc_argp = clp,
3315 .rpc_resp = &fsinfo,
3316 .rpc_cred = cred,
3317 };
3318 unsigned long now;
3319 int status;
3320
3321 now = jiffies;
3322 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3323 if (status == 0) {
3324 spin_lock(&clp->cl_lock);
3325 clp->cl_lease_time = fsinfo.lease_time * HZ;
3326 clp->cl_last_renewal = now;
3327 spin_unlock(&clp->cl_lock);
3328 }
3329 return status;
3330}
3331
3332int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3333{
3334 long timeout = 0;
3335 int err;
3336 do {
3337 err = _nfs4_proc_setclientid_confirm(clp, cred);
3338 switch (err) {
3339 case 0:
3340 return err;
3341 case -NFS4ERR_RESOURCE:
3342 /* The IBM lawyers misread another document! */
3343 case -NFS4ERR_DELAY:
3344 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3345 }
3346 } while (err == 0);
3347 return err;
3348}
3349
3350struct nfs4_delegreturndata {
3351 struct nfs4_delegreturnargs args;
3352 struct nfs4_delegreturnres res;
3353 struct nfs_fh fh;
3354 nfs4_stateid stateid;
3355 unsigned long timestamp;
3356 struct nfs_fattr fattr;
3357 int rpc_status;
3358};
3359
3360static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3361{
3362 struct nfs4_delegreturndata *data = calldata;
3363
3364 nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3365 task->tk_status);
3366
3367 data->rpc_status = task->tk_status;
3368 if (data->rpc_status == 0)
3369 renew_lease(data->res.server, data->timestamp);
3370}
3371
3372static void nfs4_delegreturn_release(void *calldata)
3373{
3374 kfree(calldata);
3375}
3376
3377#if defined(CONFIG_NFS_V4_1)
3378static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3379{
3380 struct nfs4_delegreturndata *d_data;
3381
3382 d_data = (struct nfs4_delegreturndata *)data;
3383
3384 if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3385 &d_data->args.seq_args,
3386 &d_data->res.seq_res, 1, task))
3387 return;
3388 rpc_call_start(task);
3389}
3390#endif /* CONFIG_NFS_V4_1 */
3391
3392static const struct rpc_call_ops nfs4_delegreturn_ops = {
3393#if defined(CONFIG_NFS_V4_1)
3394 .rpc_call_prepare = nfs4_delegreturn_prepare,
3395#endif /* CONFIG_NFS_V4_1 */
3396 .rpc_call_done = nfs4_delegreturn_done,
3397 .rpc_release = nfs4_delegreturn_release,
3398};
3399
3400static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3401{
3402 struct nfs4_delegreturndata *data;
3403 struct nfs_server *server = NFS_SERVER(inode);
3404 struct rpc_task *task;
3405 struct rpc_message msg = {
3406 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3407 .rpc_cred = cred,
3408 };
3409 struct rpc_task_setup task_setup_data = {
3410 .rpc_client = server->client,
3411 .rpc_message = &msg,
3412 .callback_ops = &nfs4_delegreturn_ops,
3413 .flags = RPC_TASK_ASYNC,
3414 };
3415 int status = 0;
3416
3417 data = kzalloc(sizeof(*data), GFP_KERNEL);
3418 if (data == NULL)
3419 return -ENOMEM;
3420 data->args.fhandle = &data->fh;
3421 data->args.stateid = &data->stateid;
3422 data->args.bitmask = server->attr_bitmask;
3423 nfs_copy_fh(&data->fh, NFS_FH(inode));
3424 memcpy(&data->stateid, stateid, sizeof(data->stateid));
3425 data->res.fattr = &data->fattr;
3426 data->res.server = server;
3427 data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3428 nfs_fattr_init(data->res.fattr);
3429 data->timestamp = jiffies;
3430 data->rpc_status = 0;
3431
3432 task_setup_data.callback_data = data;
3433 msg.rpc_argp = &data->args,
3434 msg.rpc_resp = &data->res,
3435 task = rpc_run_task(&task_setup_data);
3436 if (IS_ERR(task))
3437 return PTR_ERR(task);
3438 if (!issync)
3439 goto out;
3440 status = nfs4_wait_for_completion_rpc_task(task);
3441 if (status != 0)
3442 goto out;
3443 status = data->rpc_status;
3444 if (status != 0)
3445 goto out;
3446 nfs_refresh_inode(inode, &data->fattr);
3447out:
3448 rpc_put_task(task);
3449 return status;
3450}
3451
3452int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3453{
3454 struct nfs_server *server = NFS_SERVER(inode);
3455 struct nfs4_exception exception = { };
3456 int err;
3457 do {
3458 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3459 switch (err) {
3460 case -NFS4ERR_STALE_STATEID:
3461 case -NFS4ERR_EXPIRED:
3462 case 0:
3463 return 0;
3464 }
3465 err = nfs4_handle_exception(server, err, &exception);
3466 } while (exception.retry);
3467 return err;
3468}
3469
3470#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3471#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3472
3473/*
3474 * sleep, with exponential backoff, and retry the LOCK operation.
3475 */
3476static unsigned long
3477nfs4_set_lock_task_retry(unsigned long timeout)
3478{
3479 schedule_timeout_killable(timeout);
3480 timeout <<= 1;
3481 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3482 return NFS4_LOCK_MAXTIMEOUT;
3483 return timeout;
3484}
3485
3486static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3487{
3488 struct inode *inode = state->inode;
3489 struct nfs_server *server = NFS_SERVER(inode);
3490 struct nfs_client *clp = server->nfs_client;
3491 struct nfs_lockt_args arg = {
3492 .fh = NFS_FH(inode),
3493 .fl = request,
3494 };
3495 struct nfs_lockt_res res = {
3496 .denied = request,
3497 };
3498 struct rpc_message msg = {
3499 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3500 .rpc_argp = &arg,
3501 .rpc_resp = &res,
3502 .rpc_cred = state->owner->so_cred,
3503 };
3504 struct nfs4_lock_state *lsp;
3505 int status;
3506
3507 arg.lock_owner.clientid = clp->cl_clientid;
3508 status = nfs4_set_lock_state(state, request);
3509 if (status != 0)
3510 goto out;
3511 lsp = request->fl_u.nfs4_fl.owner;
3512 arg.lock_owner.id = lsp->ls_id.id;
3513 status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3514 switch (status) {
3515 case 0:
3516 request->fl_type = F_UNLCK;
3517 break;
3518 case -NFS4ERR_DENIED:
3519 status = 0;
3520 }
3521 request->fl_ops->fl_release_private(request);
3522out:
3523 return status;
3524}
3525
3526static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3527{
3528 struct nfs4_exception exception = { };
3529 int err;
3530
3531 do {
3532 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3533 _nfs4_proc_getlk(state, cmd, request),
3534 &exception);
3535 } while (exception.retry);
3536 return err;
3537}
3538
3539static int do_vfs_lock(struct file *file, struct file_lock *fl)
3540{
3541 int res = 0;
3542 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3543 case FL_POSIX:
3544 res = posix_lock_file_wait(file, fl);
3545 break;
3546 case FL_FLOCK:
3547 res = flock_lock_file_wait(file, fl);
3548 break;
3549 default:
3550 BUG();
3551 }
3552 return res;
3553}
3554
3555struct nfs4_unlockdata {
3556 struct nfs_locku_args arg;
3557 struct nfs_locku_res res;
3558 struct nfs4_lock_state *lsp;
3559 struct nfs_open_context *ctx;
3560 struct file_lock fl;
3561 const struct nfs_server *server;
3562 unsigned long timestamp;
3563};
3564
3565static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3566 struct nfs_open_context *ctx,
3567 struct nfs4_lock_state *lsp,
3568 struct nfs_seqid *seqid)
3569{
3570 struct nfs4_unlockdata *p;
3571 struct inode *inode = lsp->ls_state->inode;
3572
3573 p = kzalloc(sizeof(*p), GFP_KERNEL);
3574 if (p == NULL)
3575 return NULL;
3576 p->arg.fh = NFS_FH(inode);
3577 p->arg.fl = &p->fl;
3578 p->arg.seqid = seqid;
3579 p->res.seqid = seqid;
3580 p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3581 p->arg.stateid = &lsp->ls_stateid;
3582 p->lsp = lsp;
3583 atomic_inc(&lsp->ls_count);
3584 /* Ensure we don't close file until we're done freeing locks! */
3585 p->ctx = get_nfs_open_context(ctx);
3586 memcpy(&p->fl, fl, sizeof(p->fl));
3587 p->server = NFS_SERVER(inode);
3588 return p;
3589}
3590
3591static void nfs4_locku_release_calldata(void *data)
3592{
3593 struct nfs4_unlockdata *calldata = data;
3594 nfs_free_seqid(calldata->arg.seqid);
3595 nfs4_put_lock_state(calldata->lsp);
3596 put_nfs_open_context(calldata->ctx);
3597 kfree(calldata);
3598}
3599
3600static void nfs4_locku_done(struct rpc_task *task, void *data)
3601{
3602 struct nfs4_unlockdata *calldata = data;
3603
3604 nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3605 task->tk_status);
3606 if (RPC_ASSASSINATED(task))
3607 return;
3608 switch (task->tk_status) {
3609 case 0:
3610 memcpy(calldata->lsp->ls_stateid.data,
3611 calldata->res.stateid.data,
3612 sizeof(calldata->lsp->ls_stateid.data));
3613 renew_lease(calldata->server, calldata->timestamp);
3614 break;
3615 case -NFS4ERR_BAD_STATEID:
3616 case -NFS4ERR_OLD_STATEID:
3617 case -NFS4ERR_STALE_STATEID:
3618 case -NFS4ERR_EXPIRED:
3619 break;
3620 default:
3621 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3622 rpc_restart_call(task);
3623 }
3624 nfs4_sequence_free_slot(calldata->server->nfs_client,
3625 &calldata->res.seq_res);
3626}
3627
3628static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3629{
3630 struct nfs4_unlockdata *calldata = data;
3631
3632 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3633 return;
3634 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3635 /* Note: exit _without_ running nfs4_locku_done */
3636 task->tk_action = NULL;
3637 return;
3638 }
3639 calldata->timestamp = jiffies;
3640 if (nfs4_setup_sequence(calldata->server->nfs_client,
3641 &calldata->arg.seq_args,
3642 &calldata->res.seq_res, 1, task))
3643 return;
3644 rpc_call_start(task);
3645}
3646
3647static const struct rpc_call_ops nfs4_locku_ops = {
3648 .rpc_call_prepare = nfs4_locku_prepare,
3649 .rpc_call_done = nfs4_locku_done,
3650 .rpc_release = nfs4_locku_release_calldata,
3651};
3652
3653static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3654 struct nfs_open_context *ctx,
3655 struct nfs4_lock_state *lsp,
3656 struct nfs_seqid *seqid)
3657{
3658 struct nfs4_unlockdata *data;
3659 struct rpc_message msg = {
3660 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3661 .rpc_cred = ctx->cred,
3662 };
3663 struct rpc_task_setup task_setup_data = {
3664 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3665 .rpc_message = &msg,
3666 .callback_ops = &nfs4_locku_ops,
3667 .workqueue = nfsiod_workqueue,
3668 .flags = RPC_TASK_ASYNC,
3669 };
3670
3671 /* Ensure this is an unlock - when canceling a lock, the
3672 * canceled lock is passed in, and it won't be an unlock.
3673 */
3674 fl->fl_type = F_UNLCK;
3675
3676 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3677 if (data == NULL) {
3678 nfs_free_seqid(seqid);
3679 return ERR_PTR(-ENOMEM);
3680 }
3681
3682 msg.rpc_argp = &data->arg,
3683 msg.rpc_resp = &data->res,
3684 task_setup_data.callback_data = data;
3685 return rpc_run_task(&task_setup_data);
3686}
3687
3688static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3689{
3690 struct nfs_inode *nfsi = NFS_I(state->inode);
3691 struct nfs_seqid *seqid;
3692 struct nfs4_lock_state *lsp;
3693 struct rpc_task *task;
3694 int status = 0;
3695 unsigned char fl_flags = request->fl_flags;
3696
3697 status = nfs4_set_lock_state(state, request);
3698 /* Unlock _before_ we do the RPC call */
3699 request->fl_flags |= FL_EXISTS;
3700 down_read(&nfsi->rwsem);
3701 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3702 up_read(&nfsi->rwsem);
3703 goto out;
3704 }
3705 up_read(&nfsi->rwsem);
3706 if (status != 0)
3707 goto out;
3708 /* Is this a delegated lock? */
3709 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3710 goto out;
3711 lsp = request->fl_u.nfs4_fl.owner;
3712 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3713 status = -ENOMEM;
3714 if (seqid == NULL)
3715 goto out;
3716 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3717 status = PTR_ERR(task);
3718 if (IS_ERR(task))
3719 goto out;
3720 status = nfs4_wait_for_completion_rpc_task(task);
3721 rpc_put_task(task);
3722out:
3723 request->fl_flags = fl_flags;
3724 return status;
3725}
3726
3727struct nfs4_lockdata {
3728 struct nfs_lock_args arg;
3729 struct nfs_lock_res res;
3730 struct nfs4_lock_state *lsp;
3731 struct nfs_open_context *ctx;
3732 struct file_lock fl;
3733 unsigned long timestamp;
3734 int rpc_status;
3735 int cancelled;
3736 struct nfs_server *server;
3737};
3738
3739static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3740 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3741{
3742 struct nfs4_lockdata *p;
3743 struct inode *inode = lsp->ls_state->inode;
3744 struct nfs_server *server = NFS_SERVER(inode);
3745
3746 p = kzalloc(sizeof(*p), GFP_KERNEL);
3747 if (p == NULL)
3748 return NULL;
3749
3750 p->arg.fh = NFS_FH(inode);
3751 p->arg.fl = &p->fl;
3752 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3753 if (p->arg.open_seqid == NULL)
3754 goto out_free;
3755 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3756 if (p->arg.lock_seqid == NULL)
3757 goto out_free_seqid;
3758 p->arg.lock_stateid = &lsp->ls_stateid;
3759 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3760 p->arg.lock_owner.id = lsp->ls_id.id;
3761 p->res.lock_seqid = p->arg.lock_seqid;
3762 p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3763 p->lsp = lsp;
3764 p->server = server;
3765 atomic_inc(&lsp->ls_count);
3766 p->ctx = get_nfs_open_context(ctx);
3767 memcpy(&p->fl, fl, sizeof(p->fl));
3768 return p;
3769out_free_seqid:
3770 nfs_free_seqid(p->arg.open_seqid);
3771out_free:
3772 kfree(p);
3773 return NULL;
3774}
3775
3776static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3777{
3778 struct nfs4_lockdata *data = calldata;
3779 struct nfs4_state *state = data->lsp->ls_state;
3780
3781 dprintk("%s: begin!\n", __func__);
3782 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3783 return;
3784 /* Do we need to do an open_to_lock_owner? */
3785 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3786 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3787 return;
3788 data->arg.open_stateid = &state->stateid;
3789 data->arg.new_lock_owner = 1;
3790 data->res.open_seqid = data->arg.open_seqid;
3791 } else
3792 data->arg.new_lock_owner = 0;
3793 data->timestamp = jiffies;
3794 if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3795 &data->res.seq_res, 1, task))
3796 return;
3797 rpc_call_start(task);
3798 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3799}
3800
3801static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3802{
3803 struct nfs4_lockdata *data = calldata;
3804
3805 dprintk("%s: begin!\n", __func__);
3806
3807 nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3808 task->tk_status);
3809
3810 data->rpc_status = task->tk_status;
3811 if (RPC_ASSASSINATED(task))
3812 goto out;
3813 if (data->arg.new_lock_owner != 0) {
3814 if (data->rpc_status == 0)
3815 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3816 else
3817 goto out;
3818 }
3819 if (data->rpc_status == 0) {
3820 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3821 sizeof(data->lsp->ls_stateid.data));
3822 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3823 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3824 }
3825out:
3826 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3827}
3828
3829static void nfs4_lock_release(void *calldata)
3830{
3831 struct nfs4_lockdata *data = calldata;
3832
3833 dprintk("%s: begin!\n", __func__);
3834 nfs_free_seqid(data->arg.open_seqid);
3835 if (data->cancelled != 0) {
3836 struct rpc_task *task;
3837 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3838 data->arg.lock_seqid);
3839 if (!IS_ERR(task))
3840 rpc_put_task(task);
3841 dprintk("%s: cancelling lock!\n", __func__);
3842 } else
3843 nfs_free_seqid(data->arg.lock_seqid);
3844 nfs4_put_lock_state(data->lsp);
3845 put_nfs_open_context(data->ctx);
3846 kfree(data);
3847 dprintk("%s: done!\n", __func__);
3848}
3849
3850static const struct rpc_call_ops nfs4_lock_ops = {
3851 .rpc_call_prepare = nfs4_lock_prepare,
3852 .rpc_call_done = nfs4_lock_done,
3853 .rpc_release = nfs4_lock_release,
3854};
3855
3856static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3857{
3858 struct nfs4_lockdata *data;
3859 struct rpc_task *task;
3860 struct rpc_message msg = {
3861 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3862 .rpc_cred = state->owner->so_cred,
3863 };
3864 struct rpc_task_setup task_setup_data = {
3865 .rpc_client = NFS_CLIENT(state->inode),
3866 .rpc_message = &msg,
3867 .callback_ops = &nfs4_lock_ops,
3868 .workqueue = nfsiod_workqueue,
3869 .flags = RPC_TASK_ASYNC,
3870 };
3871 int ret;
3872
3873 dprintk("%s: begin!\n", __func__);
3874 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3875 fl->fl_u.nfs4_fl.owner);
3876 if (data == NULL)
3877 return -ENOMEM;
3878 if (IS_SETLKW(cmd))
3879 data->arg.block = 1;
3880 if (reclaim != 0)
3881 data->arg.reclaim = 1;
3882 msg.rpc_argp = &data->arg,
3883 msg.rpc_resp = &data->res,
3884 task_setup_data.callback_data = data;
3885 task = rpc_run_task(&task_setup_data);
3886 if (IS_ERR(task))
3887 return PTR_ERR(task);
3888 ret = nfs4_wait_for_completion_rpc_task(task);
3889 if (ret == 0) {
3890 ret = data->rpc_status;
3891 if (ret == -NFS4ERR_DENIED)
3892 ret = -EAGAIN;
3893 } else
3894 data->cancelled = 1;
3895 rpc_put_task(task);
3896 dprintk("%s: done, ret = %d!\n", __func__, ret);
3897 return ret;
3898}
3899
3900static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3901{
3902 struct nfs_server *server = NFS_SERVER(state->inode);
3903 struct nfs4_exception exception = { };
3904 int err;
3905
3906 do {
3907 /* Cache the lock if possible... */
3908 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3909 return 0;
3910 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3911 if (err != -NFS4ERR_DELAY)
3912 break;
3913 nfs4_handle_exception(server, err, &exception);
3914 } while (exception.retry);
3915 return err;
3916}
3917
3918static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3919{
3920 struct nfs_server *server = NFS_SERVER(state->inode);
3921 struct nfs4_exception exception = { };
3922 int err;
3923
3924 err = nfs4_set_lock_state(state, request);
3925 if (err != 0)
3926 return err;
3927 do {
3928 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3929 return 0;
3930 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3931 if (err != -NFS4ERR_DELAY)
3932 break;
3933 nfs4_handle_exception(server, err, &exception);
3934 } while (exception.retry);
3935 return err;
3936}
3937
3938static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3939{
3940 struct nfs_inode *nfsi = NFS_I(state->inode);
3941 unsigned char fl_flags = request->fl_flags;
3942 int status;
3943
3944 /* Is this a delegated open? */
3945 status = nfs4_set_lock_state(state, request);
3946 if (status != 0)
3947 goto out;
3948 request->fl_flags |= FL_ACCESS;
3949 status = do_vfs_lock(request->fl_file, request);
3950 if (status < 0)
3951 goto out;
3952 down_read(&nfsi->rwsem);
3953 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3954 /* Yes: cache locks! */
3955 /* ...but avoid races with delegation recall... */
3956 request->fl_flags = fl_flags & ~FL_SLEEP;
3957 status = do_vfs_lock(request->fl_file, request);
3958 goto out_unlock;
3959 }
3960 status = _nfs4_do_setlk(state, cmd, request, 0);
3961 if (status != 0)
3962 goto out_unlock;
3963 /* Note: we always want to sleep here! */
3964 request->fl_flags = fl_flags | FL_SLEEP;
3965 if (do_vfs_lock(request->fl_file, request) < 0)
3966 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3967out_unlock:
3968 up_read(&nfsi->rwsem);
3969out:
3970 request->fl_flags = fl_flags;
3971 return status;
3972}
3973
3974static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3975{
3976 struct nfs4_exception exception = { };
3977 int err;
3978
3979 do {
3980 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3981 _nfs4_proc_setlk(state, cmd, request),
3982 &exception);
3983 } while (exception.retry);
3984 return err;
3985}
3986
3987static int
3988nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3989{
3990 struct nfs_open_context *ctx;
3991 struct nfs4_state *state;
3992 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3993 int status;
3994
3995 /* verify open state */
3996 ctx = nfs_file_open_context(filp);
3997 state = ctx->state;
3998
3999 if (request->fl_start < 0 || request->fl_end < 0)
4000 return -EINVAL;
4001
4002 if (IS_GETLK(cmd))
4003 return nfs4_proc_getlk(state, F_GETLK, request);
4004
4005 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4006 return -EINVAL;
4007
4008 if (request->fl_type == F_UNLCK)
4009 return nfs4_proc_unlck(state, cmd, request);
4010
4011 do {
4012 status = nfs4_proc_setlk(state, cmd, request);
4013 if ((status != -EAGAIN) || IS_SETLK(cmd))
4014 break;
4015 timeout = nfs4_set_lock_task_retry(timeout);
4016 status = -ERESTARTSYS;
4017 if (signalled())
4018 break;
4019 } while(status < 0);
4020 return status;
4021}
4022
4023int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4024{
4025 struct nfs_server *server = NFS_SERVER(state->inode);
4026 struct nfs4_exception exception = { };
4027 int err;
4028
4029 err = nfs4_set_lock_state(state, fl);
4030 if (err != 0)
4031 goto out;
4032 do {
4033 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4034 if (err != -NFS4ERR_DELAY)
4035 break;
4036 err = nfs4_handle_exception(server, err, &exception);
4037 } while (exception.retry);
4038out:
4039 return err;
4040}
4041
4042#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4043
4044int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4045 size_t buflen, int flags)
4046{
4047 struct inode *inode = dentry->d_inode;
4048
4049 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4050 return -EOPNOTSUPP;
4051
4052 return nfs4_proc_set_acl(inode, buf, buflen);
4053}
4054
4055/* The getxattr man page suggests returning -ENODATA for unknown attributes,
4056 * and that's what we'll do for e.g. user attributes that haven't been set.
4057 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4058 * attributes in kernel-managed attribute namespaces. */
4059ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4060 size_t buflen)
4061{
4062 struct inode *inode = dentry->d_inode;
4063
4064 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4065 return -EOPNOTSUPP;
4066
4067 return nfs4_proc_get_acl(inode, buf, buflen);
4068}
4069
4070ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4071{
4072 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4073
4074 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4075 return 0;
4076 if (buf && buflen < len)
4077 return -ERANGE;
4078 if (buf)
4079 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4080 return len;
4081}
4082
4083static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4084{
4085 if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4086 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4087 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4088 return;
4089
4090 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4091 NFS_ATTR_FATTR_NLINK;
4092 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4093 fattr->nlink = 2;
4094}
4095
4096int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4097 struct nfs4_fs_locations *fs_locations, struct page *page)
4098{
4099 struct nfs_server *server = NFS_SERVER(dir);
4100 u32 bitmask[2] = {
4101 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4102 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4103 };
4104 struct nfs4_fs_locations_arg args = {
4105 .dir_fh = NFS_FH(dir),
4106 .name = name,
4107 .page = page,
4108 .bitmask = bitmask,
4109 };
4110 struct nfs4_fs_locations_res res = {
4111 .fs_locations = fs_locations,
4112 };
4113 struct rpc_message msg = {
4114 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4115 .rpc_argp = &args,
4116 .rpc_resp = &res,
4117 };
4118 int status;
4119
4120 dprintk("%s: start\n", __func__);
4121 nfs_fattr_init(&fs_locations->fattr);
4122 fs_locations->server = server;
4123 fs_locations->nlocations = 0;
4124 status = nfs4_call_sync(server, &msg, &args, &res, 0);
4125 nfs_fixup_referral_attributes(&fs_locations->fattr);
4126 dprintk("%s: returned status = %d\n", __func__, status);
4127 return status;
4128}
4129
4130#ifdef CONFIG_NFS_V4_1
4131/* Destroy the slot table */
4132static void nfs4_destroy_slot_table(struct nfs4_session *session)
4133{
4134 if (session->fc_slot_table.slots == NULL)
4135 return;
4136 kfree(session->fc_slot_table.slots);
4137 session->fc_slot_table.slots = NULL;
4138 return;
4139}
4140
4141struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4142{
4143 struct nfs4_session *session;
4144 struct nfs4_slot_table *tbl;
4145
4146 session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4147 if (!session)
4148 return NULL;
4149 tbl = &session->fc_slot_table;
4150 spin_lock_init(&tbl->slot_tbl_lock);
4151 rpc_init_wait_queue(&tbl->slot_tbl_waitq, "Slot table");
4152 session->clp = clp;
4153 return session;
4154}
4155
4156void nfs4_destroy_session(struct nfs4_session *session)
4157{
4158 nfs4_destroy_slot_table(session);
4159 kfree(session);
4160}
4161
4162#endif /* CONFIG_NFS_V4_1 */
4163
4164struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
4165 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4166 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4167 .recover_open = nfs4_open_reclaim,
4168 .recover_lock = nfs4_lock_reclaim,
4169};
4170
4171struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
4172 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4173 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4174 .recover_open = nfs4_open_expired,
4175 .recover_lock = nfs4_lock_expired,
4176};
4177
4178static const struct inode_operations nfs4_file_inode_operations = {
4179 .permission = nfs_permission,
4180 .getattr = nfs_getattr,
4181 .setattr = nfs_setattr,
4182 .getxattr = nfs4_getxattr,
4183 .setxattr = nfs4_setxattr,
4184 .listxattr = nfs4_listxattr,
4185};
4186
4187const struct nfs_rpc_ops nfs_v4_clientops = {
4188 .version = 4, /* protocol version */
4189 .dentry_ops = &nfs4_dentry_operations,
4190 .dir_inode_ops = &nfs4_dir_inode_operations,
4191 .file_inode_ops = &nfs4_file_inode_operations,
4192 .getroot = nfs4_proc_get_root,
4193 .getattr = nfs4_proc_getattr,
4194 .setattr = nfs4_proc_setattr,
4195 .lookupfh = nfs4_proc_lookupfh,
4196 .lookup = nfs4_proc_lookup,
4197 .access = nfs4_proc_access,
4198 .readlink = nfs4_proc_readlink,
4199 .create = nfs4_proc_create,
4200 .remove = nfs4_proc_remove,
4201 .unlink_setup = nfs4_proc_unlink_setup,
4202 .unlink_done = nfs4_proc_unlink_done,
4203 .rename = nfs4_proc_rename,
4204 .link = nfs4_proc_link,
4205 .symlink = nfs4_proc_symlink,
4206 .mkdir = nfs4_proc_mkdir,
4207 .rmdir = nfs4_proc_remove,
4208 .readdir = nfs4_proc_readdir,
4209 .mknod = nfs4_proc_mknod,
4210 .statfs = nfs4_proc_statfs,
4211 .fsinfo = nfs4_proc_fsinfo,
4212 .pathconf = nfs4_proc_pathconf,
4213 .set_capabilities = nfs4_server_capabilities,
4214 .decode_dirent = nfs4_decode_dirent,
4215 .read_setup = nfs4_proc_read_setup,
4216 .read_done = nfs4_read_done,
4217 .write_setup = nfs4_proc_write_setup,
4218 .write_done = nfs4_write_done,
4219 .commit_setup = nfs4_proc_commit_setup,
4220 .commit_done = nfs4_commit_done,
4221 .lock = nfs4_proc_lock,
4222 .clear_acl_cache = nfs4_zap_acl_attr,
4223 .close_context = nfs4_close_context,
4224};
4225
4226/*
4227 * Local variables:
4228 * c-basic-offset: 8
4229 * End:
4230 */
Linux 6.x block layer and io_uring tree(s)