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Merge branch 'bugfixes' into nfs-for-2.6.38
[mirror_ubuntu-artful-kernel.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/delay.h>
40#include <linux/errno.h>
41#include <linux/string.h>
42#include <linux/slab.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/namei.h>
49#include <linux/mount.h>
50#include <linux/module.h>
51#include <linux/sunrpc/bc_xprt.h>
52#include <linux/xattr.h>
53
54#include "nfs4_fs.h"
55#include "delegation.h"
56#include "internal.h"
57#include "iostat.h"
58#include "callback.h"
59#include "pnfs.h"
60
61#define NFSDBG_FACILITY NFSDBG_PROC
62
63#define NFS4_POLL_RETRY_MIN (HZ/10)
64#define NFS4_POLL_RETRY_MAX (15*HZ)
65
66#define NFS4_MAX_LOOP_ON_RECOVER (10)
67
68struct nfs4_opendata;
69static int _nfs4_proc_open(struct nfs4_opendata *data);
70static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
71static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
72static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
73static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
74static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
75static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
76 struct nfs_fattr *fattr, struct iattr *sattr,
77 struct nfs4_state *state);
78
79/* Prevent leaks of NFSv4 errors into userland */
80static int nfs4_map_errors(int err)
81{
82 if (err >= -1000)
83 return err;
84 switch (err) {
85 case -NFS4ERR_RESOURCE:
86 return -EREMOTEIO;
87 default:
88 dprintk("%s could not handle NFSv4 error %d\n",
89 __func__, -err);
90 break;
91 }
92 return -EIO;
93}
94
95/*
96 * This is our standard bitmap for GETATTR requests.
97 */
98const u32 nfs4_fattr_bitmap[2] = {
99 FATTR4_WORD0_TYPE
100 | FATTR4_WORD0_CHANGE
101 | FATTR4_WORD0_SIZE
102 | FATTR4_WORD0_FSID
103 | FATTR4_WORD0_FILEID,
104 FATTR4_WORD1_MODE
105 | FATTR4_WORD1_NUMLINKS
106 | FATTR4_WORD1_OWNER
107 | FATTR4_WORD1_OWNER_GROUP
108 | FATTR4_WORD1_RAWDEV
109 | FATTR4_WORD1_SPACE_USED
110 | FATTR4_WORD1_TIME_ACCESS
111 | FATTR4_WORD1_TIME_METADATA
112 | FATTR4_WORD1_TIME_MODIFY
113};
114
115const u32 nfs4_statfs_bitmap[2] = {
116 FATTR4_WORD0_FILES_AVAIL
117 | FATTR4_WORD0_FILES_FREE
118 | FATTR4_WORD0_FILES_TOTAL,
119 FATTR4_WORD1_SPACE_AVAIL
120 | FATTR4_WORD1_SPACE_FREE
121 | FATTR4_WORD1_SPACE_TOTAL
122};
123
124const u32 nfs4_pathconf_bitmap[2] = {
125 FATTR4_WORD0_MAXLINK
126 | FATTR4_WORD0_MAXNAME,
127 0
128};
129
130const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
131 | FATTR4_WORD0_MAXREAD
132 | FATTR4_WORD0_MAXWRITE
133 | FATTR4_WORD0_LEASE_TIME,
134 FATTR4_WORD1_TIME_DELTA
135 | FATTR4_WORD1_FS_LAYOUT_TYPES
136};
137
138const u32 nfs4_fs_locations_bitmap[2] = {
139 FATTR4_WORD0_TYPE
140 | FATTR4_WORD0_CHANGE
141 | FATTR4_WORD0_SIZE
142 | FATTR4_WORD0_FSID
143 | FATTR4_WORD0_FILEID
144 | FATTR4_WORD0_FS_LOCATIONS,
145 FATTR4_WORD1_MODE
146 | FATTR4_WORD1_NUMLINKS
147 | FATTR4_WORD1_OWNER
148 | FATTR4_WORD1_OWNER_GROUP
149 | FATTR4_WORD1_RAWDEV
150 | FATTR4_WORD1_SPACE_USED
151 | FATTR4_WORD1_TIME_ACCESS
152 | FATTR4_WORD1_TIME_METADATA
153 | FATTR4_WORD1_TIME_MODIFY
154 | FATTR4_WORD1_MOUNTED_ON_FILEID
155};
156
157static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
158 struct nfs4_readdir_arg *readdir)
159{
160 __be32 *start, *p;
161
162 BUG_ON(readdir->count < 80);
163 if (cookie > 2) {
164 readdir->cookie = cookie;
165 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
166 return;
167 }
168
169 readdir->cookie = 0;
170 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
171 if (cookie == 2)
172 return;
173
174 /*
175 * NFSv4 servers do not return entries for '.' and '..'
176 * Therefore, we fake these entries here. We let '.'
177 * have cookie 0 and '..' have cookie 1. Note that
178 * when talking to the server, we always send cookie 0
179 * instead of 1 or 2.
180 */
181 start = p = kmap_atomic(*readdir->pages, KM_USER0);
182
183 if (cookie == 0) {
184 *p++ = xdr_one; /* next */
185 *p++ = xdr_zero; /* cookie, first word */
186 *p++ = xdr_one; /* cookie, second word */
187 *p++ = xdr_one; /* entry len */
188 memcpy(p, ".\0\0\0", 4); /* entry */
189 p++;
190 *p++ = xdr_one; /* bitmap length */
191 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
192 *p++ = htonl(8); /* attribute buffer length */
193 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
194 }
195
196 *p++ = xdr_one; /* next */
197 *p++ = xdr_zero; /* cookie, first word */
198 *p++ = xdr_two; /* cookie, second word */
199 *p++ = xdr_two; /* entry len */
200 memcpy(p, "..\0\0", 4); /* entry */
201 p++;
202 *p++ = xdr_one; /* bitmap length */
203 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
204 *p++ = htonl(8); /* attribute buffer length */
205 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
206
207 readdir->pgbase = (char *)p - (char *)start;
208 readdir->count -= readdir->pgbase;
209 kunmap_atomic(start, KM_USER0);
210}
211
212static int nfs4_wait_clnt_recover(struct nfs_client *clp)
213{
214 int res;
215
216 might_sleep();
217
218 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
219 nfs_wait_bit_killable, TASK_KILLABLE);
220 return res;
221}
222
223static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
224{
225 int res = 0;
226
227 might_sleep();
228
229 if (*timeout <= 0)
230 *timeout = NFS4_POLL_RETRY_MIN;
231 if (*timeout > NFS4_POLL_RETRY_MAX)
232 *timeout = NFS4_POLL_RETRY_MAX;
233 schedule_timeout_killable(*timeout);
234 if (fatal_signal_pending(current))
235 res = -ERESTARTSYS;
236 *timeout <<= 1;
237 return res;
238}
239
240/* This is the error handling routine for processes that are allowed
241 * to sleep.
242 */
243static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
244{
245 struct nfs_client *clp = server->nfs_client;
246 struct nfs4_state *state = exception->state;
247 int ret = errorcode;
248
249 exception->retry = 0;
250 switch(errorcode) {
251 case 0:
252 return 0;
253 case -NFS4ERR_ADMIN_REVOKED:
254 case -NFS4ERR_BAD_STATEID:
255 case -NFS4ERR_OPENMODE:
256 if (state == NULL)
257 break;
258 nfs4_state_mark_reclaim_nograce(clp, state);
259 goto do_state_recovery;
260 case -NFS4ERR_STALE_STATEID:
261 case -NFS4ERR_STALE_CLIENTID:
262 case -NFS4ERR_EXPIRED:
263 goto do_state_recovery;
264#if defined(CONFIG_NFS_V4_1)
265 case -NFS4ERR_BADSESSION:
266 case -NFS4ERR_BADSLOT:
267 case -NFS4ERR_BAD_HIGH_SLOT:
268 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
269 case -NFS4ERR_DEADSESSION:
270 case -NFS4ERR_SEQ_FALSE_RETRY:
271 case -NFS4ERR_SEQ_MISORDERED:
272 dprintk("%s ERROR: %d Reset session\n", __func__,
273 errorcode);
274 nfs4_schedule_state_recovery(clp);
275 exception->retry = 1;
276 break;
277#endif /* defined(CONFIG_NFS_V4_1) */
278 case -NFS4ERR_FILE_OPEN:
279 if (exception->timeout > HZ) {
280 /* We have retried a decent amount, time to
281 * fail
282 */
283 ret = -EBUSY;
284 break;
285 }
286 case -NFS4ERR_GRACE:
287 case -NFS4ERR_DELAY:
288 case -EKEYEXPIRED:
289 ret = nfs4_delay(server->client, &exception->timeout);
290 if (ret != 0)
291 break;
292 case -NFS4ERR_OLD_STATEID:
293 exception->retry = 1;
294 }
295 /* We failed to handle the error */
296 return nfs4_map_errors(ret);
297do_state_recovery:
298 nfs4_schedule_state_recovery(clp);
299 ret = nfs4_wait_clnt_recover(clp);
300 if (ret == 0)
301 exception->retry = 1;
302 return ret;
303}
304
305
306static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
307{
308 spin_lock(&clp->cl_lock);
309 if (time_before(clp->cl_last_renewal,timestamp))
310 clp->cl_last_renewal = timestamp;
311 spin_unlock(&clp->cl_lock);
312}
313
314static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
315{
316 do_renew_lease(server->nfs_client, timestamp);
317}
318
319#if defined(CONFIG_NFS_V4_1)
320
321/*
322 * nfs4_free_slot - free a slot and efficiently update slot table.
323 *
324 * freeing a slot is trivially done by clearing its respective bit
325 * in the bitmap.
326 * If the freed slotid equals highest_used_slotid we want to update it
327 * so that the server would be able to size down the slot table if needed,
328 * otherwise we know that the highest_used_slotid is still in use.
329 * When updating highest_used_slotid there may be "holes" in the bitmap
330 * so we need to scan down from highest_used_slotid to 0 looking for the now
331 * highest slotid in use.
332 * If none found, highest_used_slotid is set to -1.
333 *
334 * Must be called while holding tbl->slot_tbl_lock
335 */
336static void
337nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
338{
339 int free_slotid = free_slot - tbl->slots;
340 int slotid = free_slotid;
341
342 BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
343 /* clear used bit in bitmap */
344 __clear_bit(slotid, tbl->used_slots);
345
346 /* update highest_used_slotid when it is freed */
347 if (slotid == tbl->highest_used_slotid) {
348 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
349 if (slotid < tbl->max_slots)
350 tbl->highest_used_slotid = slotid;
351 else
352 tbl->highest_used_slotid = -1;
353 }
354 dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
355 free_slotid, tbl->highest_used_slotid);
356}
357
358/*
359 * Signal state manager thread if session fore channel is drained
360 */
361static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
362{
363 struct rpc_task *task;
364
365 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
366 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
367 if (task)
368 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
369 return;
370 }
371
372 if (ses->fc_slot_table.highest_used_slotid != -1)
373 return;
374
375 dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
376 complete(&ses->fc_slot_table.complete);
377}
378
379/*
380 * Signal state manager thread if session back channel is drained
381 */
382void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
383{
384 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
385 ses->bc_slot_table.highest_used_slotid != -1)
386 return;
387 dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
388 complete(&ses->bc_slot_table.complete);
389}
390
391static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
392{
393 struct nfs4_slot_table *tbl;
394
395 tbl = &res->sr_session->fc_slot_table;
396 if (!res->sr_slot) {
397 /* just wake up the next guy waiting since
398 * we may have not consumed a slot after all */
399 dprintk("%s: No slot\n", __func__);
400 return;
401 }
402
403 spin_lock(&tbl->slot_tbl_lock);
404 nfs4_free_slot(tbl, res->sr_slot);
405 nfs4_check_drain_fc_complete(res->sr_session);
406 spin_unlock(&tbl->slot_tbl_lock);
407 res->sr_slot = NULL;
408}
409
410static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
411{
412 unsigned long timestamp;
413 struct nfs_client *clp;
414
415 /*
416 * sr_status remains 1 if an RPC level error occurred. The server
417 * may or may not have processed the sequence operation..
418 * Proceed as if the server received and processed the sequence
419 * operation.
420 */
421 if (res->sr_status == 1)
422 res->sr_status = NFS_OK;
423
424 /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
425 if (!res->sr_slot)
426 goto out;
427
428 /* Check the SEQUENCE operation status */
429 switch (res->sr_status) {
430 case 0:
431 /* Update the slot's sequence and clientid lease timer */
432 ++res->sr_slot->seq_nr;
433 timestamp = res->sr_renewal_time;
434 clp = res->sr_session->clp;
435 do_renew_lease(clp, timestamp);
436 /* Check sequence flags */
437 if (atomic_read(&clp->cl_count) > 1)
438 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
439 break;
440 case -NFS4ERR_DELAY:
441 /* The server detected a resend of the RPC call and
442 * returned NFS4ERR_DELAY as per Section 2.10.6.2
443 * of RFC5661.
444 */
445 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
446 __func__,
447 res->sr_slot - res->sr_session->fc_slot_table.slots,
448 res->sr_slot->seq_nr);
449 goto out_retry;
450 default:
451 /* Just update the slot sequence no. */
452 ++res->sr_slot->seq_nr;
453 }
454out:
455 /* The session may be reset by one of the error handlers. */
456 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
457 nfs41_sequence_free_slot(res);
458 return 1;
459out_retry:
460 if (!rpc_restart_call(task))
461 goto out;
462 rpc_delay(task, NFS4_POLL_RETRY_MAX);
463 return 0;
464}
465
466static int nfs4_sequence_done(struct rpc_task *task,
467 struct nfs4_sequence_res *res)
468{
469 if (res->sr_session == NULL)
470 return 1;
471 return nfs41_sequence_done(task, res);
472}
473
474/*
475 * nfs4_find_slot - efficiently look for a free slot
476 *
477 * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
478 * If found, we mark the slot as used, update the highest_used_slotid,
479 * and respectively set up the sequence operation args.
480 * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
481 *
482 * Note: must be called with under the slot_tbl_lock.
483 */
484static u8
485nfs4_find_slot(struct nfs4_slot_table *tbl)
486{
487 int slotid;
488 u8 ret_id = NFS4_MAX_SLOT_TABLE;
489 BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
490
491 dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
492 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
493 tbl->max_slots);
494 slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
495 if (slotid >= tbl->max_slots)
496 goto out;
497 __set_bit(slotid, tbl->used_slots);
498 if (slotid > tbl->highest_used_slotid)
499 tbl->highest_used_slotid = slotid;
500 ret_id = slotid;
501out:
502 dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
503 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
504 return ret_id;
505}
506
507static int nfs41_setup_sequence(struct nfs4_session *session,
508 struct nfs4_sequence_args *args,
509 struct nfs4_sequence_res *res,
510 int cache_reply,
511 struct rpc_task *task)
512{
513 struct nfs4_slot *slot;
514 struct nfs4_slot_table *tbl;
515 u8 slotid;
516
517 dprintk("--> %s\n", __func__);
518 /* slot already allocated? */
519 if (res->sr_slot != NULL)
520 return 0;
521
522 tbl = &session->fc_slot_table;
523
524 spin_lock(&tbl->slot_tbl_lock);
525 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
526 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
527 /*
528 * The state manager will wait until the slot table is empty.
529 * Schedule the reset thread
530 */
531 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
532 spin_unlock(&tbl->slot_tbl_lock);
533 dprintk("%s Schedule Session Reset\n", __func__);
534 return -EAGAIN;
535 }
536
537 if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
538 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
539 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
540 spin_unlock(&tbl->slot_tbl_lock);
541 dprintk("%s enforce FIFO order\n", __func__);
542 return -EAGAIN;
543 }
544
545 slotid = nfs4_find_slot(tbl);
546 if (slotid == NFS4_MAX_SLOT_TABLE) {
547 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
548 spin_unlock(&tbl->slot_tbl_lock);
549 dprintk("<-- %s: no free slots\n", __func__);
550 return -EAGAIN;
551 }
552 spin_unlock(&tbl->slot_tbl_lock);
553
554 rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
555 slot = tbl->slots + slotid;
556 args->sa_session = session;
557 args->sa_slotid = slotid;
558 args->sa_cache_this = cache_reply;
559
560 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
561
562 res->sr_session = session;
563 res->sr_slot = slot;
564 res->sr_renewal_time = jiffies;
565 res->sr_status_flags = 0;
566 /*
567 * sr_status is only set in decode_sequence, and so will remain
568 * set to 1 if an rpc level failure occurs.
569 */
570 res->sr_status = 1;
571 return 0;
572}
573
574int nfs4_setup_sequence(const struct nfs_server *server,
575 struct nfs4_sequence_args *args,
576 struct nfs4_sequence_res *res,
577 int cache_reply,
578 struct rpc_task *task)
579{
580 struct nfs4_session *session = nfs4_get_session(server);
581 int ret = 0;
582
583 if (session == NULL) {
584 args->sa_session = NULL;
585 res->sr_session = NULL;
586 goto out;
587 }
588
589 dprintk("--> %s clp %p session %p sr_slot %td\n",
590 __func__, session->clp, session, res->sr_slot ?
591 res->sr_slot - session->fc_slot_table.slots : -1);
592
593 ret = nfs41_setup_sequence(session, args, res, cache_reply,
594 task);
595out:
596 dprintk("<-- %s status=%d\n", __func__, ret);
597 return ret;
598}
599
600struct nfs41_call_sync_data {
601 const struct nfs_server *seq_server;
602 struct nfs4_sequence_args *seq_args;
603 struct nfs4_sequence_res *seq_res;
604 int cache_reply;
605};
606
607static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
608{
609 struct nfs41_call_sync_data *data = calldata;
610
611 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
612
613 if (nfs4_setup_sequence(data->seq_server, data->seq_args,
614 data->seq_res, data->cache_reply, task))
615 return;
616 rpc_call_start(task);
617}
618
619static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
620{
621 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
622 nfs41_call_sync_prepare(task, calldata);
623}
624
625static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
626{
627 struct nfs41_call_sync_data *data = calldata;
628
629 nfs41_sequence_done(task, data->seq_res);
630}
631
632struct rpc_call_ops nfs41_call_sync_ops = {
633 .rpc_call_prepare = nfs41_call_sync_prepare,
634 .rpc_call_done = nfs41_call_sync_done,
635};
636
637struct rpc_call_ops nfs41_call_priv_sync_ops = {
638 .rpc_call_prepare = nfs41_call_priv_sync_prepare,
639 .rpc_call_done = nfs41_call_sync_done,
640};
641
642static int nfs4_call_sync_sequence(struct nfs_server *server,
643 struct rpc_message *msg,
644 struct nfs4_sequence_args *args,
645 struct nfs4_sequence_res *res,
646 int cache_reply,
647 int privileged)
648{
649 int ret;
650 struct rpc_task *task;
651 struct nfs41_call_sync_data data = {
652 .seq_server = server,
653 .seq_args = args,
654 .seq_res = res,
655 .cache_reply = cache_reply,
656 };
657 struct rpc_task_setup task_setup = {
658 .rpc_client = server->client,
659 .rpc_message = msg,
660 .callback_ops = &nfs41_call_sync_ops,
661 .callback_data = &data
662 };
663
664 res->sr_slot = NULL;
665 if (privileged)
666 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
667 task = rpc_run_task(&task_setup);
668 if (IS_ERR(task))
669 ret = PTR_ERR(task);
670 else {
671 ret = task->tk_status;
672 rpc_put_task(task);
673 }
674 return ret;
675}
676
677int _nfs4_call_sync_session(struct nfs_server *server,
678 struct rpc_message *msg,
679 struct nfs4_sequence_args *args,
680 struct nfs4_sequence_res *res,
681 int cache_reply)
682{
683 return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
684}
685
686#else
687static int nfs4_sequence_done(struct rpc_task *task,
688 struct nfs4_sequence_res *res)
689{
690 return 1;
691}
692#endif /* CONFIG_NFS_V4_1 */
693
694int _nfs4_call_sync(struct nfs_server *server,
695 struct rpc_message *msg,
696 struct nfs4_sequence_args *args,
697 struct nfs4_sequence_res *res,
698 int cache_reply)
699{
700 args->sa_session = res->sr_session = NULL;
701 return rpc_call_sync(server->client, msg, 0);
702}
703
704#define nfs4_call_sync(server, msg, args, res, cache_reply) \
705 (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
706 &(res)->seq_res, (cache_reply))
707
708static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
709{
710 struct nfs_inode *nfsi = NFS_I(dir);
711
712 spin_lock(&dir->i_lock);
713 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
714 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
715 nfs_force_lookup_revalidate(dir);
716 nfsi->change_attr = cinfo->after;
717 spin_unlock(&dir->i_lock);
718}
719
720struct nfs4_opendata {
721 struct kref kref;
722 struct nfs_openargs o_arg;
723 struct nfs_openres o_res;
724 struct nfs_open_confirmargs c_arg;
725 struct nfs_open_confirmres c_res;
726 struct nfs_fattr f_attr;
727 struct nfs_fattr dir_attr;
728 struct path path;
729 struct dentry *dir;
730 struct nfs4_state_owner *owner;
731 struct nfs4_state *state;
732 struct iattr attrs;
733 unsigned long timestamp;
734 unsigned int rpc_done : 1;
735 int rpc_status;
736 int cancelled;
737};
738
739
740static void nfs4_init_opendata_res(struct nfs4_opendata *p)
741{
742 p->o_res.f_attr = &p->f_attr;
743 p->o_res.dir_attr = &p->dir_attr;
744 p->o_res.seqid = p->o_arg.seqid;
745 p->c_res.seqid = p->c_arg.seqid;
746 p->o_res.server = p->o_arg.server;
747 nfs_fattr_init(&p->f_attr);
748 nfs_fattr_init(&p->dir_attr);
749}
750
751static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
752 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
753 const struct iattr *attrs,
754 gfp_t gfp_mask)
755{
756 struct dentry *parent = dget_parent(path->dentry);
757 struct inode *dir = parent->d_inode;
758 struct nfs_server *server = NFS_SERVER(dir);
759 struct nfs4_opendata *p;
760
761 p = kzalloc(sizeof(*p), gfp_mask);
762 if (p == NULL)
763 goto err;
764 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
765 if (p->o_arg.seqid == NULL)
766 goto err_free;
767 path_get(path);
768 p->path = *path;
769 p->dir = parent;
770 p->owner = sp;
771 atomic_inc(&sp->so_count);
772 p->o_arg.fh = NFS_FH(dir);
773 p->o_arg.open_flags = flags;
774 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
775 p->o_arg.clientid = server->nfs_client->cl_clientid;
776 p->o_arg.id = sp->so_owner_id.id;
777 p->o_arg.name = &p->path.dentry->d_name;
778 p->o_arg.server = server;
779 p->o_arg.bitmask = server->attr_bitmask;
780 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
781 if (flags & O_CREAT) {
782 u32 *s;
783
784 p->o_arg.u.attrs = &p->attrs;
785 memcpy(&p->attrs, attrs, sizeof(p->attrs));
786 s = (u32 *) p->o_arg.u.verifier.data;
787 s[0] = jiffies;
788 s[1] = current->pid;
789 }
790 p->c_arg.fh = &p->o_res.fh;
791 p->c_arg.stateid = &p->o_res.stateid;
792 p->c_arg.seqid = p->o_arg.seqid;
793 nfs4_init_opendata_res(p);
794 kref_init(&p->kref);
795 return p;
796err_free:
797 kfree(p);
798err:
799 dput(parent);
800 return NULL;
801}
802
803static void nfs4_opendata_free(struct kref *kref)
804{
805 struct nfs4_opendata *p = container_of(kref,
806 struct nfs4_opendata, kref);
807
808 nfs_free_seqid(p->o_arg.seqid);
809 if (p->state != NULL)
810 nfs4_put_open_state(p->state);
811 nfs4_put_state_owner(p->owner);
812 dput(p->dir);
813 path_put(&p->path);
814 kfree(p);
815}
816
817static void nfs4_opendata_put(struct nfs4_opendata *p)
818{
819 if (p != NULL)
820 kref_put(&p->kref, nfs4_opendata_free);
821}
822
823static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
824{
825 int ret;
826
827 ret = rpc_wait_for_completion_task(task);
828 return ret;
829}
830
831static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
832{
833 int ret = 0;
834
835 if (open_mode & O_EXCL)
836 goto out;
837 switch (mode & (FMODE_READ|FMODE_WRITE)) {
838 case FMODE_READ:
839 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
840 && state->n_rdonly != 0;
841 break;
842 case FMODE_WRITE:
843 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
844 && state->n_wronly != 0;
845 break;
846 case FMODE_READ|FMODE_WRITE:
847 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
848 && state->n_rdwr != 0;
849 }
850out:
851 return ret;
852}
853
854static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
855{
856 if ((delegation->type & fmode) != fmode)
857 return 0;
858 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
859 return 0;
860 nfs_mark_delegation_referenced(delegation);
861 return 1;
862}
863
864static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
865{
866 switch (fmode) {
867 case FMODE_WRITE:
868 state->n_wronly++;
869 break;
870 case FMODE_READ:
871 state->n_rdonly++;
872 break;
873 case FMODE_READ|FMODE_WRITE:
874 state->n_rdwr++;
875 }
876 nfs4_state_set_mode_locked(state, state->state | fmode);
877}
878
879static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
880{
881 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
882 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
883 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
884 switch (fmode) {
885 case FMODE_READ:
886 set_bit(NFS_O_RDONLY_STATE, &state->flags);
887 break;
888 case FMODE_WRITE:
889 set_bit(NFS_O_WRONLY_STATE, &state->flags);
890 break;
891 case FMODE_READ|FMODE_WRITE:
892 set_bit(NFS_O_RDWR_STATE, &state->flags);
893 }
894}
895
896static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
897{
898 write_seqlock(&state->seqlock);
899 nfs_set_open_stateid_locked(state, stateid, fmode);
900 write_sequnlock(&state->seqlock);
901}
902
903static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
904{
905 /*
906 * Protect the call to nfs4_state_set_mode_locked and
907 * serialise the stateid update
908 */
909 write_seqlock(&state->seqlock);
910 if (deleg_stateid != NULL) {
911 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
912 set_bit(NFS_DELEGATED_STATE, &state->flags);
913 }
914 if (open_stateid != NULL)
915 nfs_set_open_stateid_locked(state, open_stateid, fmode);
916 write_sequnlock(&state->seqlock);
917 spin_lock(&state->owner->so_lock);
918 update_open_stateflags(state, fmode);
919 spin_unlock(&state->owner->so_lock);
920}
921
922static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
923{
924 struct nfs_inode *nfsi = NFS_I(state->inode);
925 struct nfs_delegation *deleg_cur;
926 int ret = 0;
927
928 fmode &= (FMODE_READ|FMODE_WRITE);
929
930 rcu_read_lock();
931 deleg_cur = rcu_dereference(nfsi->delegation);
932 if (deleg_cur == NULL)
933 goto no_delegation;
934
935 spin_lock(&deleg_cur->lock);
936 if (nfsi->delegation != deleg_cur ||
937 (deleg_cur->type & fmode) != fmode)
938 goto no_delegation_unlock;
939
940 if (delegation == NULL)
941 delegation = &deleg_cur->stateid;
942 else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
943 goto no_delegation_unlock;
944
945 nfs_mark_delegation_referenced(deleg_cur);
946 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
947 ret = 1;
948no_delegation_unlock:
949 spin_unlock(&deleg_cur->lock);
950no_delegation:
951 rcu_read_unlock();
952
953 if (!ret && open_stateid != NULL) {
954 __update_open_stateid(state, open_stateid, NULL, fmode);
955 ret = 1;
956 }
957
958 return ret;
959}
960
961
962static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
963{
964 struct nfs_delegation *delegation;
965
966 rcu_read_lock();
967 delegation = rcu_dereference(NFS_I(inode)->delegation);
968 if (delegation == NULL || (delegation->type & fmode) == fmode) {
969 rcu_read_unlock();
970 return;
971 }
972 rcu_read_unlock();
973 nfs_inode_return_delegation(inode);
974}
975
976static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
977{
978 struct nfs4_state *state = opendata->state;
979 struct nfs_inode *nfsi = NFS_I(state->inode);
980 struct nfs_delegation *delegation;
981 int open_mode = opendata->o_arg.open_flags & O_EXCL;
982 fmode_t fmode = opendata->o_arg.fmode;
983 nfs4_stateid stateid;
984 int ret = -EAGAIN;
985
986 for (;;) {
987 if (can_open_cached(state, fmode, open_mode)) {
988 spin_lock(&state->owner->so_lock);
989 if (can_open_cached(state, fmode, open_mode)) {
990 update_open_stateflags(state, fmode);
991 spin_unlock(&state->owner->so_lock);
992 goto out_return_state;
993 }
994 spin_unlock(&state->owner->so_lock);
995 }
996 rcu_read_lock();
997 delegation = rcu_dereference(nfsi->delegation);
998 if (delegation == NULL ||
999 !can_open_delegated(delegation, fmode)) {
1000 rcu_read_unlock();
1001 break;
1002 }
1003 /* Save the delegation */
1004 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1005 rcu_read_unlock();
1006 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1007 if (ret != 0)
1008 goto out;
1009 ret = -EAGAIN;
1010
1011 /* Try to update the stateid using the delegation */
1012 if (update_open_stateid(state, NULL, &stateid, fmode))
1013 goto out_return_state;
1014 }
1015out:
1016 return ERR_PTR(ret);
1017out_return_state:
1018 atomic_inc(&state->count);
1019 return state;
1020}
1021
1022static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1023{
1024 struct inode *inode;
1025 struct nfs4_state *state = NULL;
1026 struct nfs_delegation *delegation;
1027 int ret;
1028
1029 if (!data->rpc_done) {
1030 state = nfs4_try_open_cached(data);
1031 goto out;
1032 }
1033
1034 ret = -EAGAIN;
1035 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1036 goto err;
1037 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1038 ret = PTR_ERR(inode);
1039 if (IS_ERR(inode))
1040 goto err;
1041 ret = -ENOMEM;
1042 state = nfs4_get_open_state(inode, data->owner);
1043 if (state == NULL)
1044 goto err_put_inode;
1045 if (data->o_res.delegation_type != 0) {
1046 int delegation_flags = 0;
1047
1048 rcu_read_lock();
1049 delegation = rcu_dereference(NFS_I(inode)->delegation);
1050 if (delegation)
1051 delegation_flags = delegation->flags;
1052 rcu_read_unlock();
1053 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1054 nfs_inode_set_delegation(state->inode,
1055 data->owner->so_cred,
1056 &data->o_res);
1057 else
1058 nfs_inode_reclaim_delegation(state->inode,
1059 data->owner->so_cred,
1060 &data->o_res);
1061 }
1062
1063 update_open_stateid(state, &data->o_res.stateid, NULL,
1064 data->o_arg.fmode);
1065 iput(inode);
1066out:
1067 return state;
1068err_put_inode:
1069 iput(inode);
1070err:
1071 return ERR_PTR(ret);
1072}
1073
1074static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1075{
1076 struct nfs_inode *nfsi = NFS_I(state->inode);
1077 struct nfs_open_context *ctx;
1078
1079 spin_lock(&state->inode->i_lock);
1080 list_for_each_entry(ctx, &nfsi->open_files, list) {
1081 if (ctx->state != state)
1082 continue;
1083 get_nfs_open_context(ctx);
1084 spin_unlock(&state->inode->i_lock);
1085 return ctx;
1086 }
1087 spin_unlock(&state->inode->i_lock);
1088 return ERR_PTR(-ENOENT);
1089}
1090
1091static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1092{
1093 struct nfs4_opendata *opendata;
1094
1095 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1096 if (opendata == NULL)
1097 return ERR_PTR(-ENOMEM);
1098 opendata->state = state;
1099 atomic_inc(&state->count);
1100 return opendata;
1101}
1102
1103static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1104{
1105 struct nfs4_state *newstate;
1106 int ret;
1107
1108 opendata->o_arg.open_flags = 0;
1109 opendata->o_arg.fmode = fmode;
1110 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1111 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1112 nfs4_init_opendata_res(opendata);
1113 ret = _nfs4_recover_proc_open(opendata);
1114 if (ret != 0)
1115 return ret;
1116 newstate = nfs4_opendata_to_nfs4_state(opendata);
1117 if (IS_ERR(newstate))
1118 return PTR_ERR(newstate);
1119 nfs4_close_state(&opendata->path, newstate, fmode);
1120 *res = newstate;
1121 return 0;
1122}
1123
1124static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1125{
1126 struct nfs4_state *newstate;
1127 int ret;
1128
1129 /* memory barrier prior to reading state->n_* */
1130 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1131 smp_rmb();
1132 if (state->n_rdwr != 0) {
1133 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1134 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1135 if (ret != 0)
1136 return ret;
1137 if (newstate != state)
1138 return -ESTALE;
1139 }
1140 if (state->n_wronly != 0) {
1141 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1142 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1143 if (ret != 0)
1144 return ret;
1145 if (newstate != state)
1146 return -ESTALE;
1147 }
1148 if (state->n_rdonly != 0) {
1149 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1150 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1151 if (ret != 0)
1152 return ret;
1153 if (newstate != state)
1154 return -ESTALE;
1155 }
1156 /*
1157 * We may have performed cached opens for all three recoveries.
1158 * Check if we need to update the current stateid.
1159 */
1160 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1161 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1162 write_seqlock(&state->seqlock);
1163 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1164 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1165 write_sequnlock(&state->seqlock);
1166 }
1167 return 0;
1168}
1169
1170/*
1171 * OPEN_RECLAIM:
1172 * reclaim state on the server after a reboot.
1173 */
1174static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1175{
1176 struct nfs_delegation *delegation;
1177 struct nfs4_opendata *opendata;
1178 fmode_t delegation_type = 0;
1179 int status;
1180
1181 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1182 if (IS_ERR(opendata))
1183 return PTR_ERR(opendata);
1184 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1185 opendata->o_arg.fh = NFS_FH(state->inode);
1186 rcu_read_lock();
1187 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1188 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1189 delegation_type = delegation->type;
1190 rcu_read_unlock();
1191 opendata->o_arg.u.delegation_type = delegation_type;
1192 status = nfs4_open_recover(opendata, state);
1193 nfs4_opendata_put(opendata);
1194 return status;
1195}
1196
1197static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1198{
1199 struct nfs_server *server = NFS_SERVER(state->inode);
1200 struct nfs4_exception exception = { };
1201 int err;
1202 do {
1203 err = _nfs4_do_open_reclaim(ctx, state);
1204 if (err != -NFS4ERR_DELAY)
1205 break;
1206 nfs4_handle_exception(server, err, &exception);
1207 } while (exception.retry);
1208 return err;
1209}
1210
1211static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1212{
1213 struct nfs_open_context *ctx;
1214 int ret;
1215
1216 ctx = nfs4_state_find_open_context(state);
1217 if (IS_ERR(ctx))
1218 return PTR_ERR(ctx);
1219 ret = nfs4_do_open_reclaim(ctx, state);
1220 put_nfs_open_context(ctx);
1221 return ret;
1222}
1223
1224static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1225{
1226 struct nfs4_opendata *opendata;
1227 int ret;
1228
1229 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1230 if (IS_ERR(opendata))
1231 return PTR_ERR(opendata);
1232 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1233 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1234 sizeof(opendata->o_arg.u.delegation.data));
1235 ret = nfs4_open_recover(opendata, state);
1236 nfs4_opendata_put(opendata);
1237 return ret;
1238}
1239
1240int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1241{
1242 struct nfs4_exception exception = { };
1243 struct nfs_server *server = NFS_SERVER(state->inode);
1244 int err;
1245 do {
1246 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1247 switch (err) {
1248 case 0:
1249 case -ENOENT:
1250 case -ESTALE:
1251 goto out;
1252 case -NFS4ERR_BADSESSION:
1253 case -NFS4ERR_BADSLOT:
1254 case -NFS4ERR_BAD_HIGH_SLOT:
1255 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1256 case -NFS4ERR_DEADSESSION:
1257 nfs4_schedule_state_recovery(
1258 server->nfs_client);
1259 goto out;
1260 case -NFS4ERR_STALE_CLIENTID:
1261 case -NFS4ERR_STALE_STATEID:
1262 case -NFS4ERR_EXPIRED:
1263 /* Don't recall a delegation if it was lost */
1264 nfs4_schedule_state_recovery(server->nfs_client);
1265 goto out;
1266 case -ERESTARTSYS:
1267 /*
1268 * The show must go on: exit, but mark the
1269 * stateid as needing recovery.
1270 */
1271 case -NFS4ERR_ADMIN_REVOKED:
1272 case -NFS4ERR_BAD_STATEID:
1273 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1274 case -EKEYEXPIRED:
1275 /*
1276 * User RPCSEC_GSS context has expired.
1277 * We cannot recover this stateid now, so
1278 * skip it and allow recovery thread to
1279 * proceed.
1280 */
1281 case -ENOMEM:
1282 err = 0;
1283 goto out;
1284 }
1285 err = nfs4_handle_exception(server, err, &exception);
1286 } while (exception.retry);
1287out:
1288 return err;
1289}
1290
1291static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1292{
1293 struct nfs4_opendata *data = calldata;
1294
1295 data->rpc_status = task->tk_status;
1296 if (data->rpc_status == 0) {
1297 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1298 sizeof(data->o_res.stateid.data));
1299 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1300 renew_lease(data->o_res.server, data->timestamp);
1301 data->rpc_done = 1;
1302 }
1303}
1304
1305static void nfs4_open_confirm_release(void *calldata)
1306{
1307 struct nfs4_opendata *data = calldata;
1308 struct nfs4_state *state = NULL;
1309
1310 /* If this request hasn't been cancelled, do nothing */
1311 if (data->cancelled == 0)
1312 goto out_free;
1313 /* In case of error, no cleanup! */
1314 if (!data->rpc_done)
1315 goto out_free;
1316 state = nfs4_opendata_to_nfs4_state(data);
1317 if (!IS_ERR(state))
1318 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1319out_free:
1320 nfs4_opendata_put(data);
1321}
1322
1323static const struct rpc_call_ops nfs4_open_confirm_ops = {
1324 .rpc_call_done = nfs4_open_confirm_done,
1325 .rpc_release = nfs4_open_confirm_release,
1326};
1327
1328/*
1329 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1330 */
1331static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1332{
1333 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1334 struct rpc_task *task;
1335 struct rpc_message msg = {
1336 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1337 .rpc_argp = &data->c_arg,
1338 .rpc_resp = &data->c_res,
1339 .rpc_cred = data->owner->so_cred,
1340 };
1341 struct rpc_task_setup task_setup_data = {
1342 .rpc_client = server->client,
1343 .rpc_message = &msg,
1344 .callback_ops = &nfs4_open_confirm_ops,
1345 .callback_data = data,
1346 .workqueue = nfsiod_workqueue,
1347 .flags = RPC_TASK_ASYNC,
1348 };
1349 int status;
1350
1351 kref_get(&data->kref);
1352 data->rpc_done = 0;
1353 data->rpc_status = 0;
1354 data->timestamp = jiffies;
1355 task = rpc_run_task(&task_setup_data);
1356 if (IS_ERR(task))
1357 return PTR_ERR(task);
1358 status = nfs4_wait_for_completion_rpc_task(task);
1359 if (status != 0) {
1360 data->cancelled = 1;
1361 smp_wmb();
1362 } else
1363 status = data->rpc_status;
1364 rpc_put_task(task);
1365 return status;
1366}
1367
1368static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1369{
1370 struct nfs4_opendata *data = calldata;
1371 struct nfs4_state_owner *sp = data->owner;
1372
1373 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1374 return;
1375 /*
1376 * Check if we still need to send an OPEN call, or if we can use
1377 * a delegation instead.
1378 */
1379 if (data->state != NULL) {
1380 struct nfs_delegation *delegation;
1381
1382 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1383 goto out_no_action;
1384 rcu_read_lock();
1385 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1386 if (delegation != NULL &&
1387 test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1388 rcu_read_unlock();
1389 goto out_no_action;
1390 }
1391 rcu_read_unlock();
1392 }
1393 /* Update sequence id. */
1394 data->o_arg.id = sp->so_owner_id.id;
1395 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1396 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1397 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1398 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1399 }
1400 data->timestamp = jiffies;
1401 if (nfs4_setup_sequence(data->o_arg.server,
1402 &data->o_arg.seq_args,
1403 &data->o_res.seq_res, 1, task))
1404 return;
1405 rpc_call_start(task);
1406 return;
1407out_no_action:
1408 task->tk_action = NULL;
1409
1410}
1411
1412static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1413{
1414 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1415 nfs4_open_prepare(task, calldata);
1416}
1417
1418static void nfs4_open_done(struct rpc_task *task, void *calldata)
1419{
1420 struct nfs4_opendata *data = calldata;
1421
1422 data->rpc_status = task->tk_status;
1423
1424 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1425 return;
1426
1427 if (task->tk_status == 0) {
1428 switch (data->o_res.f_attr->mode & S_IFMT) {
1429 case S_IFREG:
1430 break;
1431 case S_IFLNK:
1432 data->rpc_status = -ELOOP;
1433 break;
1434 case S_IFDIR:
1435 data->rpc_status = -EISDIR;
1436 break;
1437 default:
1438 data->rpc_status = -ENOTDIR;
1439 }
1440 renew_lease(data->o_res.server, data->timestamp);
1441 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1442 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1443 }
1444 data->rpc_done = 1;
1445}
1446
1447static void nfs4_open_release(void *calldata)
1448{
1449 struct nfs4_opendata *data = calldata;
1450 struct nfs4_state *state = NULL;
1451
1452 /* If this request hasn't been cancelled, do nothing */
1453 if (data->cancelled == 0)
1454 goto out_free;
1455 /* In case of error, no cleanup! */
1456 if (data->rpc_status != 0 || !data->rpc_done)
1457 goto out_free;
1458 /* In case we need an open_confirm, no cleanup! */
1459 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1460 goto out_free;
1461 state = nfs4_opendata_to_nfs4_state(data);
1462 if (!IS_ERR(state))
1463 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1464out_free:
1465 nfs4_opendata_put(data);
1466}
1467
1468static const struct rpc_call_ops nfs4_open_ops = {
1469 .rpc_call_prepare = nfs4_open_prepare,
1470 .rpc_call_done = nfs4_open_done,
1471 .rpc_release = nfs4_open_release,
1472};
1473
1474static const struct rpc_call_ops nfs4_recover_open_ops = {
1475 .rpc_call_prepare = nfs4_recover_open_prepare,
1476 .rpc_call_done = nfs4_open_done,
1477 .rpc_release = nfs4_open_release,
1478};
1479
1480static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1481{
1482 struct inode *dir = data->dir->d_inode;
1483 struct nfs_server *server = NFS_SERVER(dir);
1484 struct nfs_openargs *o_arg = &data->o_arg;
1485 struct nfs_openres *o_res = &data->o_res;
1486 struct rpc_task *task;
1487 struct rpc_message msg = {
1488 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1489 .rpc_argp = o_arg,
1490 .rpc_resp = o_res,
1491 .rpc_cred = data->owner->so_cred,
1492 };
1493 struct rpc_task_setup task_setup_data = {
1494 .rpc_client = server->client,
1495 .rpc_message = &msg,
1496 .callback_ops = &nfs4_open_ops,
1497 .callback_data = data,
1498 .workqueue = nfsiod_workqueue,
1499 .flags = RPC_TASK_ASYNC,
1500 };
1501 int status;
1502
1503 kref_get(&data->kref);
1504 data->rpc_done = 0;
1505 data->rpc_status = 0;
1506 data->cancelled = 0;
1507 if (isrecover)
1508 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1509 task = rpc_run_task(&task_setup_data);
1510 if (IS_ERR(task))
1511 return PTR_ERR(task);
1512 status = nfs4_wait_for_completion_rpc_task(task);
1513 if (status != 0) {
1514 data->cancelled = 1;
1515 smp_wmb();
1516 } else
1517 status = data->rpc_status;
1518 rpc_put_task(task);
1519
1520 return status;
1521}
1522
1523static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1524{
1525 struct inode *dir = data->dir->d_inode;
1526 struct nfs_openres *o_res = &data->o_res;
1527 int status;
1528
1529 status = nfs4_run_open_task(data, 1);
1530 if (status != 0 || !data->rpc_done)
1531 return status;
1532
1533 nfs_refresh_inode(dir, o_res->dir_attr);
1534
1535 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1536 status = _nfs4_proc_open_confirm(data);
1537 if (status != 0)
1538 return status;
1539 }
1540
1541 return status;
1542}
1543
1544/*
1545 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1546 */
1547static int _nfs4_proc_open(struct nfs4_opendata *data)
1548{
1549 struct inode *dir = data->dir->d_inode;
1550 struct nfs_server *server = NFS_SERVER(dir);
1551 struct nfs_openargs *o_arg = &data->o_arg;
1552 struct nfs_openres *o_res = &data->o_res;
1553 int status;
1554
1555 status = nfs4_run_open_task(data, 0);
1556 if (status != 0 || !data->rpc_done)
1557 return status;
1558
1559 if (o_arg->open_flags & O_CREAT) {
1560 update_changeattr(dir, &o_res->cinfo);
1561 nfs_post_op_update_inode(dir, o_res->dir_attr);
1562 } else
1563 nfs_refresh_inode(dir, o_res->dir_attr);
1564 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1565 server->caps &= ~NFS_CAP_POSIX_LOCK;
1566 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1567 status = _nfs4_proc_open_confirm(data);
1568 if (status != 0)
1569 return status;
1570 }
1571 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1572 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1573 return 0;
1574}
1575
1576static int nfs4_recover_expired_lease(struct nfs_server *server)
1577{
1578 struct nfs_client *clp = server->nfs_client;
1579 unsigned int loop;
1580 int ret;
1581
1582 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1583 ret = nfs4_wait_clnt_recover(clp);
1584 if (ret != 0)
1585 break;
1586 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1587 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1588 break;
1589 nfs4_schedule_state_recovery(clp);
1590 ret = -EIO;
1591 }
1592 return ret;
1593}
1594
1595/*
1596 * OPEN_EXPIRED:
1597 * reclaim state on the server after a network partition.
1598 * Assumes caller holds the appropriate lock
1599 */
1600static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1601{
1602 struct nfs4_opendata *opendata;
1603 int ret;
1604
1605 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1606 if (IS_ERR(opendata))
1607 return PTR_ERR(opendata);
1608 ret = nfs4_open_recover(opendata, state);
1609 if (ret == -ESTALE)
1610 d_drop(ctx->path.dentry);
1611 nfs4_opendata_put(opendata);
1612 return ret;
1613}
1614
1615static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1616{
1617 struct nfs_server *server = NFS_SERVER(state->inode);
1618 struct nfs4_exception exception = { };
1619 int err;
1620
1621 do {
1622 err = _nfs4_open_expired(ctx, state);
1623 switch (err) {
1624 default:
1625 goto out;
1626 case -NFS4ERR_GRACE:
1627 case -NFS4ERR_DELAY:
1628 nfs4_handle_exception(server, err, &exception);
1629 err = 0;
1630 }
1631 } while (exception.retry);
1632out:
1633 return err;
1634}
1635
1636static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1637{
1638 struct nfs_open_context *ctx;
1639 int ret;
1640
1641 ctx = nfs4_state_find_open_context(state);
1642 if (IS_ERR(ctx))
1643 return PTR_ERR(ctx);
1644 ret = nfs4_do_open_expired(ctx, state);
1645 put_nfs_open_context(ctx);
1646 return ret;
1647}
1648
1649/*
1650 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1651 * fields corresponding to attributes that were used to store the verifier.
1652 * Make sure we clobber those fields in the later setattr call
1653 */
1654static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1655{
1656 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1657 !(sattr->ia_valid & ATTR_ATIME_SET))
1658 sattr->ia_valid |= ATTR_ATIME;
1659
1660 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1661 !(sattr->ia_valid & ATTR_MTIME_SET))
1662 sattr->ia_valid |= ATTR_MTIME;
1663}
1664
1665/*
1666 * Returns a referenced nfs4_state
1667 */
1668static 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)
1669{
1670 struct nfs4_state_owner *sp;
1671 struct nfs4_state *state = NULL;
1672 struct nfs_server *server = NFS_SERVER(dir);
1673 struct nfs4_opendata *opendata;
1674 int status;
1675
1676 /* Protect against reboot recovery conflicts */
1677 status = -ENOMEM;
1678 if (!(sp = nfs4_get_state_owner(server, cred))) {
1679 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1680 goto out_err;
1681 }
1682 status = nfs4_recover_expired_lease(server);
1683 if (status != 0)
1684 goto err_put_state_owner;
1685 if (path->dentry->d_inode != NULL)
1686 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1687 status = -ENOMEM;
1688 opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1689 if (opendata == NULL)
1690 goto err_put_state_owner;
1691
1692 if (path->dentry->d_inode != NULL)
1693 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1694
1695 status = _nfs4_proc_open(opendata);
1696 if (status != 0)
1697 goto err_opendata_put;
1698
1699 state = nfs4_opendata_to_nfs4_state(opendata);
1700 status = PTR_ERR(state);
1701 if (IS_ERR(state))
1702 goto err_opendata_put;
1703 if (server->caps & NFS_CAP_POSIX_LOCK)
1704 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1705
1706 if (opendata->o_arg.open_flags & O_EXCL) {
1707 nfs4_exclusive_attrset(opendata, sattr);
1708
1709 nfs_fattr_init(opendata->o_res.f_attr);
1710 status = nfs4_do_setattr(state->inode, cred,
1711 opendata->o_res.f_attr, sattr,
1712 state);
1713 if (status == 0)
1714 nfs_setattr_update_inode(state->inode, sattr);
1715 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1716 }
1717 nfs4_opendata_put(opendata);
1718 nfs4_put_state_owner(sp);
1719 *res = state;
1720 return 0;
1721err_opendata_put:
1722 nfs4_opendata_put(opendata);
1723err_put_state_owner:
1724 nfs4_put_state_owner(sp);
1725out_err:
1726 *res = NULL;
1727 return status;
1728}
1729
1730
1731static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1732{
1733 struct nfs4_exception exception = { };
1734 struct nfs4_state *res;
1735 int status;
1736
1737 do {
1738 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1739 if (status == 0)
1740 break;
1741 /* NOTE: BAD_SEQID means the server and client disagree about the
1742 * book-keeping w.r.t. state-changing operations
1743 * (OPEN/CLOSE/LOCK/LOCKU...)
1744 * It is actually a sign of a bug on the client or on the server.
1745 *
1746 * If we receive a BAD_SEQID error in the particular case of
1747 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1748 * have unhashed the old state_owner for us, and that we can
1749 * therefore safely retry using a new one. We should still warn
1750 * the user though...
1751 */
1752 if (status == -NFS4ERR_BAD_SEQID) {
1753 printk(KERN_WARNING "NFS: v4 server %s "
1754 " returned a bad sequence-id error!\n",
1755 NFS_SERVER(dir)->nfs_client->cl_hostname);
1756 exception.retry = 1;
1757 continue;
1758 }
1759 /*
1760 * BAD_STATEID on OPEN means that the server cancelled our
1761 * state before it received the OPEN_CONFIRM.
1762 * Recover by retrying the request as per the discussion
1763 * on Page 181 of RFC3530.
1764 */
1765 if (status == -NFS4ERR_BAD_STATEID) {
1766 exception.retry = 1;
1767 continue;
1768 }
1769 if (status == -EAGAIN) {
1770 /* We must have found a delegation */
1771 exception.retry = 1;
1772 continue;
1773 }
1774 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1775 status, &exception));
1776 } while (exception.retry);
1777 return res;
1778}
1779
1780static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1781 struct nfs_fattr *fattr, struct iattr *sattr,
1782 struct nfs4_state *state)
1783{
1784 struct nfs_server *server = NFS_SERVER(inode);
1785 struct nfs_setattrargs arg = {
1786 .fh = NFS_FH(inode),
1787 .iap = sattr,
1788 .server = server,
1789 .bitmask = server->attr_bitmask,
1790 };
1791 struct nfs_setattrres res = {
1792 .fattr = fattr,
1793 .server = server,
1794 };
1795 struct rpc_message msg = {
1796 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1797 .rpc_argp = &arg,
1798 .rpc_resp = &res,
1799 .rpc_cred = cred,
1800 };
1801 unsigned long timestamp = jiffies;
1802 int status;
1803
1804 nfs_fattr_init(fattr);
1805
1806 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1807 /* Use that stateid */
1808 } else if (state != NULL) {
1809 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1810 } else
1811 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1812
1813 status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1814 if (status == 0 && state != NULL)
1815 renew_lease(server, timestamp);
1816 return status;
1817}
1818
1819static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1820 struct nfs_fattr *fattr, struct iattr *sattr,
1821 struct nfs4_state *state)
1822{
1823 struct nfs_server *server = NFS_SERVER(inode);
1824 struct nfs4_exception exception = { };
1825 int err;
1826 do {
1827 err = nfs4_handle_exception(server,
1828 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1829 &exception);
1830 } while (exception.retry);
1831 return err;
1832}
1833
1834struct nfs4_closedata {
1835 struct path path;
1836 struct inode *inode;
1837 struct nfs4_state *state;
1838 struct nfs_closeargs arg;
1839 struct nfs_closeres res;
1840 struct nfs_fattr fattr;
1841 unsigned long timestamp;
1842 bool roc;
1843 u32 roc_barrier;
1844};
1845
1846static void nfs4_free_closedata(void *data)
1847{
1848 struct nfs4_closedata *calldata = data;
1849 struct nfs4_state_owner *sp = calldata->state->owner;
1850
1851 if (calldata->roc)
1852 pnfs_roc_release(calldata->state->inode);
1853 nfs4_put_open_state(calldata->state);
1854 nfs_free_seqid(calldata->arg.seqid);
1855 nfs4_put_state_owner(sp);
1856 path_put(&calldata->path);
1857 kfree(calldata);
1858}
1859
1860static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1861 fmode_t fmode)
1862{
1863 spin_lock(&state->owner->so_lock);
1864 if (!(fmode & FMODE_READ))
1865 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1866 if (!(fmode & FMODE_WRITE))
1867 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1868 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1869 spin_unlock(&state->owner->so_lock);
1870}
1871
1872static void nfs4_close_done(struct rpc_task *task, void *data)
1873{
1874 struct nfs4_closedata *calldata = data;
1875 struct nfs4_state *state = calldata->state;
1876 struct nfs_server *server = NFS_SERVER(calldata->inode);
1877
1878 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1879 return;
1880 /* hmm. we are done with the inode, and in the process of freeing
1881 * the state_owner. we keep this around to process errors
1882 */
1883 switch (task->tk_status) {
1884 case 0:
1885 if (calldata->roc)
1886 pnfs_roc_set_barrier(state->inode,
1887 calldata->roc_barrier);
1888 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1889 renew_lease(server, calldata->timestamp);
1890 nfs4_close_clear_stateid_flags(state,
1891 calldata->arg.fmode);
1892 break;
1893 case -NFS4ERR_STALE_STATEID:
1894 case -NFS4ERR_OLD_STATEID:
1895 case -NFS4ERR_BAD_STATEID:
1896 case -NFS4ERR_EXPIRED:
1897 if (calldata->arg.fmode == 0)
1898 break;
1899 default:
1900 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1901 rpc_restart_call_prepare(task);
1902 }
1903 nfs_release_seqid(calldata->arg.seqid);
1904 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1905}
1906
1907static void nfs4_close_prepare(struct rpc_task *task, void *data)
1908{
1909 struct nfs4_closedata *calldata = data;
1910 struct nfs4_state *state = calldata->state;
1911 int call_close = 0;
1912
1913 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1914 return;
1915
1916 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1917 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1918 spin_lock(&state->owner->so_lock);
1919 /* Calculate the change in open mode */
1920 if (state->n_rdwr == 0) {
1921 if (state->n_rdonly == 0) {
1922 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1923 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1924 calldata->arg.fmode &= ~FMODE_READ;
1925 }
1926 if (state->n_wronly == 0) {
1927 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1928 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1929 calldata->arg.fmode &= ~FMODE_WRITE;
1930 }
1931 }
1932 spin_unlock(&state->owner->so_lock);
1933
1934 if (!call_close) {
1935 /* Note: exit _without_ calling nfs4_close_done */
1936 task->tk_action = NULL;
1937 return;
1938 }
1939
1940 if (calldata->arg.fmode == 0) {
1941 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1942 if (calldata->roc &&
1943 pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1944 rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1945 task, NULL);
1946 return;
1947 }
1948 }
1949
1950 nfs_fattr_init(calldata->res.fattr);
1951 calldata->timestamp = jiffies;
1952 if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1953 &calldata->arg.seq_args, &calldata->res.seq_res,
1954 1, task))
1955 return;
1956 rpc_call_start(task);
1957}
1958
1959static const struct rpc_call_ops nfs4_close_ops = {
1960 .rpc_call_prepare = nfs4_close_prepare,
1961 .rpc_call_done = nfs4_close_done,
1962 .rpc_release = nfs4_free_closedata,
1963};
1964
1965/*
1966 * It is possible for data to be read/written from a mem-mapped file
1967 * after the sys_close call (which hits the vfs layer as a flush).
1968 * This means that we can't safely call nfsv4 close on a file until
1969 * the inode is cleared. This in turn means that we are not good
1970 * NFSv4 citizens - we do not indicate to the server to update the file's
1971 * share state even when we are done with one of the three share
1972 * stateid's in the inode.
1973 *
1974 * NOTE: Caller must be holding the sp->so_owner semaphore!
1975 */
1976int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
1977{
1978 struct nfs_server *server = NFS_SERVER(state->inode);
1979 struct nfs4_closedata *calldata;
1980 struct nfs4_state_owner *sp = state->owner;
1981 struct rpc_task *task;
1982 struct rpc_message msg = {
1983 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1984 .rpc_cred = state->owner->so_cred,
1985 };
1986 struct rpc_task_setup task_setup_data = {
1987 .rpc_client = server->client,
1988 .rpc_message = &msg,
1989 .callback_ops = &nfs4_close_ops,
1990 .workqueue = nfsiod_workqueue,
1991 .flags = RPC_TASK_ASYNC,
1992 };
1993 int status = -ENOMEM;
1994
1995 calldata = kzalloc(sizeof(*calldata), gfp_mask);
1996 if (calldata == NULL)
1997 goto out;
1998 calldata->inode = state->inode;
1999 calldata->state = state;
2000 calldata->arg.fh = NFS_FH(state->inode);
2001 calldata->arg.stateid = &state->open_stateid;
2002 /* Serialization for the sequence id */
2003 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2004 if (calldata->arg.seqid == NULL)
2005 goto out_free_calldata;
2006 calldata->arg.fmode = 0;
2007 calldata->arg.bitmask = server->cache_consistency_bitmask;
2008 calldata->res.fattr = &calldata->fattr;
2009 calldata->res.seqid = calldata->arg.seqid;
2010 calldata->res.server = server;
2011 calldata->roc = roc;
2012 path_get(path);
2013 calldata->path = *path;
2014
2015 msg.rpc_argp = &calldata->arg;
2016 msg.rpc_resp = &calldata->res;
2017 task_setup_data.callback_data = calldata;
2018 task = rpc_run_task(&task_setup_data);
2019 if (IS_ERR(task))
2020 return PTR_ERR(task);
2021 status = 0;
2022 if (wait)
2023 status = rpc_wait_for_completion_task(task);
2024 rpc_put_task(task);
2025 return status;
2026out_free_calldata:
2027 kfree(calldata);
2028out:
2029 if (roc)
2030 pnfs_roc_release(state->inode);
2031 nfs4_put_open_state(state);
2032 nfs4_put_state_owner(sp);
2033 return status;
2034}
2035
2036static struct inode *
2037nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2038{
2039 struct nfs4_state *state;
2040
2041 /* Protect against concurrent sillydeletes */
2042 state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2043 if (IS_ERR(state))
2044 return ERR_CAST(state);
2045 ctx->state = state;
2046 return igrab(state->inode);
2047}
2048
2049static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2050{
2051 if (ctx->state == NULL)
2052 return;
2053 if (is_sync)
2054 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2055 else
2056 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2057}
2058
2059static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2060{
2061 struct nfs4_server_caps_arg args = {
2062 .fhandle = fhandle,
2063 };
2064 struct nfs4_server_caps_res res = {};
2065 struct rpc_message msg = {
2066 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2067 .rpc_argp = &args,
2068 .rpc_resp = &res,
2069 };
2070 int status;
2071
2072 status = nfs4_call_sync(server, &msg, &args, &res, 0);
2073 if (status == 0) {
2074 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2075 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2076 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2077 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2078 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2079 NFS_CAP_CTIME|NFS_CAP_MTIME);
2080 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2081 server->caps |= NFS_CAP_ACLS;
2082 if (res.has_links != 0)
2083 server->caps |= NFS_CAP_HARDLINKS;
2084 if (res.has_symlinks != 0)
2085 server->caps |= NFS_CAP_SYMLINKS;
2086 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2087 server->caps |= NFS_CAP_FILEID;
2088 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2089 server->caps |= NFS_CAP_MODE;
2090 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2091 server->caps |= NFS_CAP_NLINK;
2092 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2093 server->caps |= NFS_CAP_OWNER;
2094 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2095 server->caps |= NFS_CAP_OWNER_GROUP;
2096 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2097 server->caps |= NFS_CAP_ATIME;
2098 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2099 server->caps |= NFS_CAP_CTIME;
2100 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2101 server->caps |= NFS_CAP_MTIME;
2102
2103 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2104 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2105 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2106 server->acl_bitmask = res.acl_bitmask;
2107 }
2108
2109 return status;
2110}
2111
2112int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2113{
2114 struct nfs4_exception exception = { };
2115 int err;
2116 do {
2117 err = nfs4_handle_exception(server,
2118 _nfs4_server_capabilities(server, fhandle),
2119 &exception);
2120 } while (exception.retry);
2121 return err;
2122}
2123
2124static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2125 struct nfs_fsinfo *info)
2126{
2127 struct nfs4_lookup_root_arg args = {
2128 .bitmask = nfs4_fattr_bitmap,
2129 };
2130 struct nfs4_lookup_res res = {
2131 .server = server,
2132 .fattr = info->fattr,
2133 .fh = fhandle,
2134 };
2135 struct rpc_message msg = {
2136 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2137 .rpc_argp = &args,
2138 .rpc_resp = &res,
2139 };
2140
2141 nfs_fattr_init(info->fattr);
2142 return nfs4_call_sync(server, &msg, &args, &res, 0);
2143}
2144
2145static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2146 struct nfs_fsinfo *info)
2147{
2148 struct nfs4_exception exception = { };
2149 int err;
2150 do {
2151 err = nfs4_handle_exception(server,
2152 _nfs4_lookup_root(server, fhandle, info),
2153 &exception);
2154 } while (exception.retry);
2155 return err;
2156}
2157
2158/*
2159 * get the file handle for the "/" directory on the server
2160 */
2161static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2162 struct nfs_fsinfo *info)
2163{
2164 int status;
2165
2166 status = nfs4_lookup_root(server, fhandle, info);
2167 if (status == 0)
2168 status = nfs4_server_capabilities(server, fhandle);
2169 if (status == 0)
2170 status = nfs4_do_fsinfo(server, fhandle, info);
2171 return nfs4_map_errors(status);
2172}
2173
2174/*
2175 * Get locations and (maybe) other attributes of a referral.
2176 * Note that we'll actually follow the referral later when
2177 * we detect fsid mismatch in inode revalidation
2178 */
2179static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2180{
2181 int status = -ENOMEM;
2182 struct page *page = NULL;
2183 struct nfs4_fs_locations *locations = NULL;
2184
2185 page = alloc_page(GFP_KERNEL);
2186 if (page == NULL)
2187 goto out;
2188 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2189 if (locations == NULL)
2190 goto out;
2191
2192 status = nfs4_proc_fs_locations(dir, name, locations, page);
2193 if (status != 0)
2194 goto out;
2195 /* Make sure server returned a different fsid for the referral */
2196 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2197 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2198 status = -EIO;
2199 goto out;
2200 }
2201
2202 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2203 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2204 if (!fattr->mode)
2205 fattr->mode = S_IFDIR;
2206 memset(fhandle, 0, sizeof(struct nfs_fh));
2207out:
2208 if (page)
2209 __free_page(page);
2210 kfree(locations);
2211 return status;
2212}
2213
2214static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2215{
2216 struct nfs4_getattr_arg args = {
2217 .fh = fhandle,
2218 .bitmask = server->attr_bitmask,
2219 };
2220 struct nfs4_getattr_res res = {
2221 .fattr = fattr,
2222 .server = server,
2223 };
2224 struct rpc_message msg = {
2225 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2226 .rpc_argp = &args,
2227 .rpc_resp = &res,
2228 };
2229
2230 nfs_fattr_init(fattr);
2231 return nfs4_call_sync(server, &msg, &args, &res, 0);
2232}
2233
2234static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2235{
2236 struct nfs4_exception exception = { };
2237 int err;
2238 do {
2239 err = nfs4_handle_exception(server,
2240 _nfs4_proc_getattr(server, fhandle, fattr),
2241 &exception);
2242 } while (exception.retry);
2243 return err;
2244}
2245
2246/*
2247 * The file is not closed if it is opened due to the a request to change
2248 * the size of the file. The open call will not be needed once the
2249 * VFS layer lookup-intents are implemented.
2250 *
2251 * Close is called when the inode is destroyed.
2252 * If we haven't opened the file for O_WRONLY, we
2253 * need to in the size_change case to obtain a stateid.
2254 *
2255 * Got race?
2256 * Because OPEN is always done by name in nfsv4, it is
2257 * possible that we opened a different file by the same
2258 * name. We can recognize this race condition, but we
2259 * can't do anything about it besides returning an error.
2260 *
2261 * This will be fixed with VFS changes (lookup-intent).
2262 */
2263static int
2264nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2265 struct iattr *sattr)
2266{
2267 struct inode *inode = dentry->d_inode;
2268 struct rpc_cred *cred = NULL;
2269 struct nfs4_state *state = NULL;
2270 int status;
2271
2272 nfs_fattr_init(fattr);
2273
2274 /* Search for an existing open(O_WRITE) file */
2275 if (sattr->ia_valid & ATTR_FILE) {
2276 struct nfs_open_context *ctx;
2277
2278 ctx = nfs_file_open_context(sattr->ia_file);
2279 if (ctx) {
2280 cred = ctx->cred;
2281 state = ctx->state;
2282 }
2283 }
2284
2285 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2286 if (status == 0)
2287 nfs_setattr_update_inode(inode, sattr);
2288 return status;
2289}
2290
2291static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2292 const struct qstr *name, struct nfs_fh *fhandle,
2293 struct nfs_fattr *fattr)
2294{
2295 int status;
2296 struct nfs4_lookup_arg args = {
2297 .bitmask = server->attr_bitmask,
2298 .dir_fh = dirfh,
2299 .name = name,
2300 };
2301 struct nfs4_lookup_res res = {
2302 .server = server,
2303 .fattr = fattr,
2304 .fh = fhandle,
2305 };
2306 struct rpc_message msg = {
2307 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2308 .rpc_argp = &args,
2309 .rpc_resp = &res,
2310 };
2311
2312 nfs_fattr_init(fattr);
2313
2314 dprintk("NFS call lookupfh %s\n", name->name);
2315 status = nfs4_call_sync(server, &msg, &args, &res, 0);
2316 dprintk("NFS reply lookupfh: %d\n", status);
2317 return status;
2318}
2319
2320static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2321 struct qstr *name, struct nfs_fh *fhandle,
2322 struct nfs_fattr *fattr)
2323{
2324 struct nfs4_exception exception = { };
2325 int err;
2326 do {
2327 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2328 /* FIXME: !!!! */
2329 if (err == -NFS4ERR_MOVED) {
2330 err = -EREMOTE;
2331 break;
2332 }
2333 err = nfs4_handle_exception(server, err, &exception);
2334 } while (exception.retry);
2335 return err;
2336}
2337
2338static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2339 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2340{
2341 int status;
2342
2343 dprintk("NFS call lookup %s\n", name->name);
2344 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2345 if (status == -NFS4ERR_MOVED)
2346 status = nfs4_get_referral(dir, name, fattr, fhandle);
2347 dprintk("NFS reply lookup: %d\n", status);
2348 return status;
2349}
2350
2351static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2352{
2353 struct nfs4_exception exception = { };
2354 int err;
2355 do {
2356 err = nfs4_handle_exception(NFS_SERVER(dir),
2357 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2358 &exception);
2359 } while (exception.retry);
2360 return err;
2361}
2362
2363static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2364{
2365 struct nfs_server *server = NFS_SERVER(inode);
2366 struct nfs4_accessargs args = {
2367 .fh = NFS_FH(inode),
2368 .bitmask = server->attr_bitmask,
2369 };
2370 struct nfs4_accessres res = {
2371 .server = server,
2372 };
2373 struct rpc_message msg = {
2374 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2375 .rpc_argp = &args,
2376 .rpc_resp = &res,
2377 .rpc_cred = entry->cred,
2378 };
2379 int mode = entry->mask;
2380 int status;
2381
2382 /*
2383 * Determine which access bits we want to ask for...
2384 */
2385 if (mode & MAY_READ)
2386 args.access |= NFS4_ACCESS_READ;
2387 if (S_ISDIR(inode->i_mode)) {
2388 if (mode & MAY_WRITE)
2389 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2390 if (mode & MAY_EXEC)
2391 args.access |= NFS4_ACCESS_LOOKUP;
2392 } else {
2393 if (mode & MAY_WRITE)
2394 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2395 if (mode & MAY_EXEC)
2396 args.access |= NFS4_ACCESS_EXECUTE;
2397 }
2398
2399 res.fattr = nfs_alloc_fattr();
2400 if (res.fattr == NULL)
2401 return -ENOMEM;
2402
2403 status = nfs4_call_sync(server, &msg, &args, &res, 0);
2404 if (!status) {
2405 entry->mask = 0;
2406 if (res.access & NFS4_ACCESS_READ)
2407 entry->mask |= MAY_READ;
2408 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2409 entry->mask |= MAY_WRITE;
2410 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2411 entry->mask |= MAY_EXEC;
2412 nfs_refresh_inode(inode, res.fattr);
2413 }
2414 nfs_free_fattr(res.fattr);
2415 return status;
2416}
2417
2418static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2419{
2420 struct nfs4_exception exception = { };
2421 int err;
2422 do {
2423 err = nfs4_handle_exception(NFS_SERVER(inode),
2424 _nfs4_proc_access(inode, entry),
2425 &exception);
2426 } while (exception.retry);
2427 return err;
2428}
2429
2430/*
2431 * TODO: For the time being, we don't try to get any attributes
2432 * along with any of the zero-copy operations READ, READDIR,
2433 * READLINK, WRITE.
2434 *
2435 * In the case of the first three, we want to put the GETATTR
2436 * after the read-type operation -- this is because it is hard
2437 * to predict the length of a GETATTR response in v4, and thus
2438 * align the READ data correctly. This means that the GETATTR
2439 * may end up partially falling into the page cache, and we should
2440 * shift it into the 'tail' of the xdr_buf before processing.
2441 * To do this efficiently, we need to know the total length
2442 * of data received, which doesn't seem to be available outside
2443 * of the RPC layer.
2444 *
2445 * In the case of WRITE, we also want to put the GETATTR after
2446 * the operation -- in this case because we want to make sure
2447 * we get the post-operation mtime and size. This means that
2448 * we can't use xdr_encode_pages() as written: we need a variant
2449 * of it which would leave room in the 'tail' iovec.
2450 *
2451 * Both of these changes to the XDR layer would in fact be quite
2452 * minor, but I decided to leave them for a subsequent patch.
2453 */
2454static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2455 unsigned int pgbase, unsigned int pglen)
2456{
2457 struct nfs4_readlink args = {
2458 .fh = NFS_FH(inode),
2459 .pgbase = pgbase,
2460 .pglen = pglen,
2461 .pages = &page,
2462 };
2463 struct nfs4_readlink_res res;
2464 struct rpc_message msg = {
2465 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2466 .rpc_argp = &args,
2467 .rpc_resp = &res,
2468 };
2469
2470 return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2471}
2472
2473static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2474 unsigned int pgbase, unsigned int pglen)
2475{
2476 struct nfs4_exception exception = { };
2477 int err;
2478 do {
2479 err = nfs4_handle_exception(NFS_SERVER(inode),
2480 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2481 &exception);
2482 } while (exception.retry);
2483 return err;
2484}
2485
2486/*
2487 * Got race?
2488 * We will need to arrange for the VFS layer to provide an atomic open.
2489 * Until then, this create/open method is prone to inefficiency and race
2490 * conditions due to the lookup, create, and open VFS calls from sys_open()
2491 * placed on the wire.
2492 *
2493 * Given the above sorry state of affairs, I'm simply sending an OPEN.
2494 * The file will be opened again in the subsequent VFS open call
2495 * (nfs4_proc_file_open).
2496 *
2497 * The open for read will just hang around to be used by any process that
2498 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2499 */
2500
2501static int
2502nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2503 int flags, struct nfs_open_context *ctx)
2504{
2505 struct path my_path = {
2506 .dentry = dentry,
2507 };
2508 struct path *path = &my_path;
2509 struct nfs4_state *state;
2510 struct rpc_cred *cred = NULL;
2511 fmode_t fmode = 0;
2512 int status = 0;
2513
2514 if (ctx != NULL) {
2515 cred = ctx->cred;
2516 path = &ctx->path;
2517 fmode = ctx->mode;
2518 }
2519 sattr->ia_mode &= ~current_umask();
2520 state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2521 d_drop(dentry);
2522 if (IS_ERR(state)) {
2523 status = PTR_ERR(state);
2524 goto out;
2525 }
2526 d_add(dentry, igrab(state->inode));
2527 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2528 if (ctx != NULL)
2529 ctx->state = state;
2530 else
2531 nfs4_close_sync(path, state, fmode);
2532out:
2533 return status;
2534}
2535
2536static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2537{
2538 struct nfs_server *server = NFS_SERVER(dir);
2539 struct nfs_removeargs args = {
2540 .fh = NFS_FH(dir),
2541 .name.len = name->len,
2542 .name.name = name->name,
2543 .bitmask = server->attr_bitmask,
2544 };
2545 struct nfs_removeres res = {
2546 .server = server,
2547 };
2548 struct rpc_message msg = {
2549 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2550 .rpc_argp = &args,
2551 .rpc_resp = &res,
2552 };
2553 int status = -ENOMEM;
2554
2555 res.dir_attr = nfs_alloc_fattr();
2556 if (res.dir_attr == NULL)
2557 goto out;
2558
2559 status = nfs4_call_sync(server, &msg, &args, &res, 1);
2560 if (status == 0) {
2561 update_changeattr(dir, &res.cinfo);
2562 nfs_post_op_update_inode(dir, res.dir_attr);
2563 }
2564 nfs_free_fattr(res.dir_attr);
2565out:
2566 return status;
2567}
2568
2569static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2570{
2571 struct nfs4_exception exception = { };
2572 int err;
2573 do {
2574 err = nfs4_handle_exception(NFS_SERVER(dir),
2575 _nfs4_proc_remove(dir, name),
2576 &exception);
2577 } while (exception.retry);
2578 return err;
2579}
2580
2581static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2582{
2583 struct nfs_server *server = NFS_SERVER(dir);
2584 struct nfs_removeargs *args = msg->rpc_argp;
2585 struct nfs_removeres *res = msg->rpc_resp;
2586
2587 args->bitmask = server->cache_consistency_bitmask;
2588 res->server = server;
2589 res->seq_res.sr_slot = NULL;
2590 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2591}
2592
2593static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2594{
2595 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2596
2597 if (!nfs4_sequence_done(task, &res->seq_res))
2598 return 0;
2599 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2600 return 0;
2601 update_changeattr(dir, &res->cinfo);
2602 nfs_post_op_update_inode(dir, res->dir_attr);
2603 return 1;
2604}
2605
2606static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2607{
2608 struct nfs_server *server = NFS_SERVER(dir);
2609 struct nfs_renameargs *arg = msg->rpc_argp;
2610 struct nfs_renameres *res = msg->rpc_resp;
2611
2612 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2613 arg->bitmask = server->attr_bitmask;
2614 res->server = server;
2615}
2616
2617static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2618 struct inode *new_dir)
2619{
2620 struct nfs_renameres *res = task->tk_msg.rpc_resp;
2621
2622 if (!nfs4_sequence_done(task, &res->seq_res))
2623 return 0;
2624 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2625 return 0;
2626
2627 update_changeattr(old_dir, &res->old_cinfo);
2628 nfs_post_op_update_inode(old_dir, res->old_fattr);
2629 update_changeattr(new_dir, &res->new_cinfo);
2630 nfs_post_op_update_inode(new_dir, res->new_fattr);
2631 return 1;
2632}
2633
2634static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2635 struct inode *new_dir, struct qstr *new_name)
2636{
2637 struct nfs_server *server = NFS_SERVER(old_dir);
2638 struct nfs_renameargs arg = {
2639 .old_dir = NFS_FH(old_dir),
2640 .new_dir = NFS_FH(new_dir),
2641 .old_name = old_name,
2642 .new_name = new_name,
2643 .bitmask = server->attr_bitmask,
2644 };
2645 struct nfs_renameres res = {
2646 .server = server,
2647 };
2648 struct rpc_message msg = {
2649 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2650 .rpc_argp = &arg,
2651 .rpc_resp = &res,
2652 };
2653 int status = -ENOMEM;
2654
2655 res.old_fattr = nfs_alloc_fattr();
2656 res.new_fattr = nfs_alloc_fattr();
2657 if (res.old_fattr == NULL || res.new_fattr == NULL)
2658 goto out;
2659
2660 status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2661 if (!status) {
2662 update_changeattr(old_dir, &res.old_cinfo);
2663 nfs_post_op_update_inode(old_dir, res.old_fattr);
2664 update_changeattr(new_dir, &res.new_cinfo);
2665 nfs_post_op_update_inode(new_dir, res.new_fattr);
2666 }
2667out:
2668 nfs_free_fattr(res.new_fattr);
2669 nfs_free_fattr(res.old_fattr);
2670 return status;
2671}
2672
2673static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2674 struct inode *new_dir, struct qstr *new_name)
2675{
2676 struct nfs4_exception exception = { };
2677 int err;
2678 do {
2679 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2680 _nfs4_proc_rename(old_dir, old_name,
2681 new_dir, new_name),
2682 &exception);
2683 } while (exception.retry);
2684 return err;
2685}
2686
2687static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2688{
2689 struct nfs_server *server = NFS_SERVER(inode);
2690 struct nfs4_link_arg arg = {
2691 .fh = NFS_FH(inode),
2692 .dir_fh = NFS_FH(dir),
2693 .name = name,
2694 .bitmask = server->attr_bitmask,
2695 };
2696 struct nfs4_link_res res = {
2697 .server = server,
2698 };
2699 struct rpc_message msg = {
2700 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2701 .rpc_argp = &arg,
2702 .rpc_resp = &res,
2703 };
2704 int status = -ENOMEM;
2705
2706 res.fattr = nfs_alloc_fattr();
2707 res.dir_attr = nfs_alloc_fattr();
2708 if (res.fattr == NULL || res.dir_attr == NULL)
2709 goto out;
2710
2711 status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2712 if (!status) {
2713 update_changeattr(dir, &res.cinfo);
2714 nfs_post_op_update_inode(dir, res.dir_attr);
2715 nfs_post_op_update_inode(inode, res.fattr);
2716 }
2717out:
2718 nfs_free_fattr(res.dir_attr);
2719 nfs_free_fattr(res.fattr);
2720 return status;
2721}
2722
2723static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2724{
2725 struct nfs4_exception exception = { };
2726 int err;
2727 do {
2728 err = nfs4_handle_exception(NFS_SERVER(inode),
2729 _nfs4_proc_link(inode, dir, name),
2730 &exception);
2731 } while (exception.retry);
2732 return err;
2733}
2734
2735struct nfs4_createdata {
2736 struct rpc_message msg;
2737 struct nfs4_create_arg arg;
2738 struct nfs4_create_res res;
2739 struct nfs_fh fh;
2740 struct nfs_fattr fattr;
2741 struct nfs_fattr dir_fattr;
2742};
2743
2744static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2745 struct qstr *name, struct iattr *sattr, u32 ftype)
2746{
2747 struct nfs4_createdata *data;
2748
2749 data = kzalloc(sizeof(*data), GFP_KERNEL);
2750 if (data != NULL) {
2751 struct nfs_server *server = NFS_SERVER(dir);
2752
2753 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2754 data->msg.rpc_argp = &data->arg;
2755 data->msg.rpc_resp = &data->res;
2756 data->arg.dir_fh = NFS_FH(dir);
2757 data->arg.server = server;
2758 data->arg.name = name;
2759 data->arg.attrs = sattr;
2760 data->arg.ftype = ftype;
2761 data->arg.bitmask = server->attr_bitmask;
2762 data->res.server = server;
2763 data->res.fh = &data->fh;
2764 data->res.fattr = &data->fattr;
2765 data->res.dir_fattr = &data->dir_fattr;
2766 nfs_fattr_init(data->res.fattr);
2767 nfs_fattr_init(data->res.dir_fattr);
2768 }
2769 return data;
2770}
2771
2772static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2773{
2774 int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2775 &data->arg, &data->res, 1);
2776 if (status == 0) {
2777 update_changeattr(dir, &data->res.dir_cinfo);
2778 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2779 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2780 }
2781 return status;
2782}
2783
2784static void nfs4_free_createdata(struct nfs4_createdata *data)
2785{
2786 kfree(data);
2787}
2788
2789static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2790 struct page *page, unsigned int len, struct iattr *sattr)
2791{
2792 struct nfs4_createdata *data;
2793 int status = -ENAMETOOLONG;
2794
2795 if (len > NFS4_MAXPATHLEN)
2796 goto out;
2797
2798 status = -ENOMEM;
2799 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2800 if (data == NULL)
2801 goto out;
2802
2803 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2804 data->arg.u.symlink.pages = &page;
2805 data->arg.u.symlink.len = len;
2806
2807 status = nfs4_do_create(dir, dentry, data);
2808
2809 nfs4_free_createdata(data);
2810out:
2811 return status;
2812}
2813
2814static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2815 struct page *page, unsigned int len, struct iattr *sattr)
2816{
2817 struct nfs4_exception exception = { };
2818 int err;
2819 do {
2820 err = nfs4_handle_exception(NFS_SERVER(dir),
2821 _nfs4_proc_symlink(dir, dentry, page,
2822 len, sattr),
2823 &exception);
2824 } while (exception.retry);
2825 return err;
2826}
2827
2828static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2829 struct iattr *sattr)
2830{
2831 struct nfs4_createdata *data;
2832 int status = -ENOMEM;
2833
2834 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2835 if (data == NULL)
2836 goto out;
2837
2838 status = nfs4_do_create(dir, dentry, data);
2839
2840 nfs4_free_createdata(data);
2841out:
2842 return status;
2843}
2844
2845static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2846 struct iattr *sattr)
2847{
2848 struct nfs4_exception exception = { };
2849 int err;
2850
2851 sattr->ia_mode &= ~current_umask();
2852 do {
2853 err = nfs4_handle_exception(NFS_SERVER(dir),
2854 _nfs4_proc_mkdir(dir, dentry, sattr),
2855 &exception);
2856 } while (exception.retry);
2857 return err;
2858}
2859
2860static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2861 u64 cookie, struct page **pages, unsigned int count, int plus)
2862{
2863 struct inode *dir = dentry->d_inode;
2864 struct nfs4_readdir_arg args = {
2865 .fh = NFS_FH(dir),
2866 .pages = pages,
2867 .pgbase = 0,
2868 .count = count,
2869 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2870 .plus = plus,
2871 };
2872 struct nfs4_readdir_res res;
2873 struct rpc_message msg = {
2874 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2875 .rpc_argp = &args,
2876 .rpc_resp = &res,
2877 .rpc_cred = cred,
2878 };
2879 int status;
2880
2881 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2882 dentry->d_parent->d_name.name,
2883 dentry->d_name.name,
2884 (unsigned long long)cookie);
2885 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2886 res.pgbase = args.pgbase;
2887 status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2888 if (status >= 0) {
2889 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2890 status += args.pgbase;
2891 }
2892
2893 nfs_invalidate_atime(dir);
2894
2895 dprintk("%s: returns %d\n", __func__, status);
2896 return status;
2897}
2898
2899static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2900 u64 cookie, struct page **pages, unsigned int count, int plus)
2901{
2902 struct nfs4_exception exception = { };
2903 int err;
2904 do {
2905 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2906 _nfs4_proc_readdir(dentry, cred, cookie,
2907 pages, count, plus),
2908 &exception);
2909 } while (exception.retry);
2910 return err;
2911}
2912
2913static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2914 struct iattr *sattr, dev_t rdev)
2915{
2916 struct nfs4_createdata *data;
2917 int mode = sattr->ia_mode;
2918 int status = -ENOMEM;
2919
2920 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2921 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2922
2923 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2924 if (data == NULL)
2925 goto out;
2926
2927 if (S_ISFIFO(mode))
2928 data->arg.ftype = NF4FIFO;
2929 else if (S_ISBLK(mode)) {
2930 data->arg.ftype = NF4BLK;
2931 data->arg.u.device.specdata1 = MAJOR(rdev);
2932 data->arg.u.device.specdata2 = MINOR(rdev);
2933 }
2934 else if (S_ISCHR(mode)) {
2935 data->arg.ftype = NF4CHR;
2936 data->arg.u.device.specdata1 = MAJOR(rdev);
2937 data->arg.u.device.specdata2 = MINOR(rdev);
2938 }
2939
2940 status = nfs4_do_create(dir, dentry, data);
2941
2942 nfs4_free_createdata(data);
2943out:
2944 return status;
2945}
2946
2947static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2948 struct iattr *sattr, dev_t rdev)
2949{
2950 struct nfs4_exception exception = { };
2951 int err;
2952
2953 sattr->ia_mode &= ~current_umask();
2954 do {
2955 err = nfs4_handle_exception(NFS_SERVER(dir),
2956 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2957 &exception);
2958 } while (exception.retry);
2959 return err;
2960}
2961
2962static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2963 struct nfs_fsstat *fsstat)
2964{
2965 struct nfs4_statfs_arg args = {
2966 .fh = fhandle,
2967 .bitmask = server->attr_bitmask,
2968 };
2969 struct nfs4_statfs_res res = {
2970 .fsstat = fsstat,
2971 };
2972 struct rpc_message msg = {
2973 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2974 .rpc_argp = &args,
2975 .rpc_resp = &res,
2976 };
2977
2978 nfs_fattr_init(fsstat->fattr);
2979 return nfs4_call_sync(server, &msg, &args, &res, 0);
2980}
2981
2982static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2983{
2984 struct nfs4_exception exception = { };
2985 int err;
2986 do {
2987 err = nfs4_handle_exception(server,
2988 _nfs4_proc_statfs(server, fhandle, fsstat),
2989 &exception);
2990 } while (exception.retry);
2991 return err;
2992}
2993
2994static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2995 struct nfs_fsinfo *fsinfo)
2996{
2997 struct nfs4_fsinfo_arg args = {
2998 .fh = fhandle,
2999 .bitmask = server->attr_bitmask,
3000 };
3001 struct nfs4_fsinfo_res res = {
3002 .fsinfo = fsinfo,
3003 };
3004 struct rpc_message msg = {
3005 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3006 .rpc_argp = &args,
3007 .rpc_resp = &res,
3008 };
3009
3010 return nfs4_call_sync(server, &msg, &args, &res, 0);
3011}
3012
3013static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3014{
3015 struct nfs4_exception exception = { };
3016 int err;
3017
3018 do {
3019 err = nfs4_handle_exception(server,
3020 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3021 &exception);
3022 } while (exception.retry);
3023 return err;
3024}
3025
3026static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3027{
3028 nfs_fattr_init(fsinfo->fattr);
3029 return nfs4_do_fsinfo(server, fhandle, fsinfo);
3030}
3031
3032static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3033 struct nfs_pathconf *pathconf)
3034{
3035 struct nfs4_pathconf_arg args = {
3036 .fh = fhandle,
3037 .bitmask = server->attr_bitmask,
3038 };
3039 struct nfs4_pathconf_res res = {
3040 .pathconf = pathconf,
3041 };
3042 struct rpc_message msg = {
3043 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3044 .rpc_argp = &args,
3045 .rpc_resp = &res,
3046 };
3047
3048 /* None of the pathconf attributes are mandatory to implement */
3049 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3050 memset(pathconf, 0, sizeof(*pathconf));
3051 return 0;
3052 }
3053
3054 nfs_fattr_init(pathconf->fattr);
3055 return nfs4_call_sync(server, &msg, &args, &res, 0);
3056}
3057
3058static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3059 struct nfs_pathconf *pathconf)
3060{
3061 struct nfs4_exception exception = { };
3062 int err;
3063
3064 do {
3065 err = nfs4_handle_exception(server,
3066 _nfs4_proc_pathconf(server, fhandle, pathconf),
3067 &exception);
3068 } while (exception.retry);
3069 return err;
3070}
3071
3072static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3073{
3074 struct nfs_server *server = NFS_SERVER(data->inode);
3075
3076 dprintk("--> %s\n", __func__);
3077
3078 if (!nfs4_sequence_done(task, &data->res.seq_res))
3079 return -EAGAIN;
3080
3081 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3082 nfs_restart_rpc(task, server->nfs_client);
3083 return -EAGAIN;
3084 }
3085
3086 nfs_invalidate_atime(data->inode);
3087 if (task->tk_status > 0)
3088 renew_lease(server, data->timestamp);
3089 return 0;
3090}
3091
3092static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3093{
3094 data->timestamp = jiffies;
3095 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3096}
3097
3098static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3099{
3100 struct inode *inode = data->inode;
3101
3102 if (!nfs4_sequence_done(task, &data->res.seq_res))
3103 return -EAGAIN;
3104
3105 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3106 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3107 return -EAGAIN;
3108 }
3109 if (task->tk_status >= 0) {
3110 renew_lease(NFS_SERVER(inode), data->timestamp);
3111 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3112 }
3113 return 0;
3114}
3115
3116static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3117{
3118 struct nfs_server *server = NFS_SERVER(data->inode);
3119
3120 data->args.bitmask = server->cache_consistency_bitmask;
3121 data->res.server = server;
3122 data->timestamp = jiffies;
3123
3124 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3125}
3126
3127static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3128{
3129 struct inode *inode = data->inode;
3130
3131 if (!nfs4_sequence_done(task, &data->res.seq_res))
3132 return -EAGAIN;
3133
3134 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3135 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3136 return -EAGAIN;
3137 }
3138 nfs_refresh_inode(inode, data->res.fattr);
3139 return 0;
3140}
3141
3142static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3143{
3144 struct nfs_server *server = NFS_SERVER(data->inode);
3145
3146 data->args.bitmask = server->cache_consistency_bitmask;
3147 data->res.server = server;
3148 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3149}
3150
3151struct nfs4_renewdata {
3152 struct nfs_client *client;
3153 unsigned long timestamp;
3154};
3155
3156/*
3157 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3158 * standalone procedure for queueing an asynchronous RENEW.
3159 */
3160static void nfs4_renew_release(void *calldata)
3161{
3162 struct nfs4_renewdata *data = calldata;
3163 struct nfs_client *clp = data->client;
3164
3165 if (atomic_read(&clp->cl_count) > 1)
3166 nfs4_schedule_state_renewal(clp);
3167 nfs_put_client(clp);
3168 kfree(data);
3169}
3170
3171static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3172{
3173 struct nfs4_renewdata *data = calldata;
3174 struct nfs_client *clp = data->client;
3175 unsigned long timestamp = data->timestamp;
3176
3177 if (task->tk_status < 0) {
3178 /* Unless we're shutting down, schedule state recovery! */
3179 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3180 nfs4_schedule_state_recovery(clp);
3181 return;
3182 }
3183 do_renew_lease(clp, timestamp);
3184}
3185
3186static const struct rpc_call_ops nfs4_renew_ops = {
3187 .rpc_call_done = nfs4_renew_done,
3188 .rpc_release = nfs4_renew_release,
3189};
3190
3191int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3192{
3193 struct rpc_message msg = {
3194 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3195 .rpc_argp = clp,
3196 .rpc_cred = cred,
3197 };
3198 struct nfs4_renewdata *data;
3199
3200 if (!atomic_inc_not_zero(&clp->cl_count))
3201 return -EIO;
3202 data = kmalloc(sizeof(*data), GFP_KERNEL);
3203 if (data == NULL)
3204 return -ENOMEM;
3205 data->client = clp;
3206 data->timestamp = jiffies;
3207 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3208 &nfs4_renew_ops, data);
3209}
3210
3211int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3212{
3213 struct rpc_message msg = {
3214 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3215 .rpc_argp = clp,
3216 .rpc_cred = cred,
3217 };
3218 unsigned long now = jiffies;
3219 int status;
3220
3221 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3222 if (status < 0)
3223 return status;
3224 do_renew_lease(clp, now);
3225 return 0;
3226}
3227
3228static inline int nfs4_server_supports_acls(struct nfs_server *server)
3229{
3230 return (server->caps & NFS_CAP_ACLS)
3231 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3232 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3233}
3234
3235/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3236 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3237 * the stack.
3238 */
3239#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3240
3241static void buf_to_pages(const void *buf, size_t buflen,
3242 struct page **pages, unsigned int *pgbase)
3243{
3244 const void *p = buf;
3245
3246 *pgbase = offset_in_page(buf);
3247 p -= *pgbase;
3248 while (p < buf + buflen) {
3249 *(pages++) = virt_to_page(p);
3250 p += PAGE_CACHE_SIZE;
3251 }
3252}
3253
3254struct nfs4_cached_acl {
3255 int cached;
3256 size_t len;
3257 char data[0];
3258};
3259
3260static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3261{
3262 struct nfs_inode *nfsi = NFS_I(inode);
3263
3264 spin_lock(&inode->i_lock);
3265 kfree(nfsi->nfs4_acl);
3266 nfsi->nfs4_acl = acl;
3267 spin_unlock(&inode->i_lock);
3268}
3269
3270static void nfs4_zap_acl_attr(struct inode *inode)
3271{
3272 nfs4_set_cached_acl(inode, NULL);
3273}
3274
3275static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3276{
3277 struct nfs_inode *nfsi = NFS_I(inode);
3278 struct nfs4_cached_acl *acl;
3279 int ret = -ENOENT;
3280
3281 spin_lock(&inode->i_lock);
3282 acl = nfsi->nfs4_acl;
3283 if (acl == NULL)
3284 goto out;
3285 if (buf == NULL) /* user is just asking for length */
3286 goto out_len;
3287 if (acl->cached == 0)
3288 goto out;
3289 ret = -ERANGE; /* see getxattr(2) man page */
3290 if (acl->len > buflen)
3291 goto out;
3292 memcpy(buf, acl->data, acl->len);
3293out_len:
3294 ret = acl->len;
3295out:
3296 spin_unlock(&inode->i_lock);
3297 return ret;
3298}
3299
3300static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3301{
3302 struct nfs4_cached_acl *acl;
3303
3304 if (buf && acl_len <= PAGE_SIZE) {
3305 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3306 if (acl == NULL)
3307 goto out;
3308 acl->cached = 1;
3309 memcpy(acl->data, buf, acl_len);
3310 } else {
3311 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3312 if (acl == NULL)
3313 goto out;
3314 acl->cached = 0;
3315 }
3316 acl->len = acl_len;
3317out:
3318 nfs4_set_cached_acl(inode, acl);
3319}
3320
3321static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3322{
3323 struct page *pages[NFS4ACL_MAXPAGES];
3324 struct nfs_getaclargs args = {
3325 .fh = NFS_FH(inode),
3326 .acl_pages = pages,
3327 .acl_len = buflen,
3328 };
3329 struct nfs_getaclres res = {
3330 .acl_len = buflen,
3331 };
3332 void *resp_buf;
3333 struct rpc_message msg = {
3334 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3335 .rpc_argp = &args,
3336 .rpc_resp = &res,
3337 };
3338 struct page *localpage = NULL;
3339 int ret;
3340
3341 if (buflen < PAGE_SIZE) {
3342 /* As long as we're doing a round trip to the server anyway,
3343 * let's be prepared for a page of acl data. */
3344 localpage = alloc_page(GFP_KERNEL);
3345 resp_buf = page_address(localpage);
3346 if (localpage == NULL)
3347 return -ENOMEM;
3348 args.acl_pages[0] = localpage;
3349 args.acl_pgbase = 0;
3350 args.acl_len = PAGE_SIZE;
3351 } else {
3352 resp_buf = buf;
3353 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3354 }
3355 ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3356 if (ret)
3357 goto out_free;
3358 if (res.acl_len > args.acl_len)
3359 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3360 else
3361 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3362 if (buf) {
3363 ret = -ERANGE;
3364 if (res.acl_len > buflen)
3365 goto out_free;
3366 if (localpage)
3367 memcpy(buf, resp_buf, res.acl_len);
3368 }
3369 ret = res.acl_len;
3370out_free:
3371 if (localpage)
3372 __free_page(localpage);
3373 return ret;
3374}
3375
3376static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3377{
3378 struct nfs4_exception exception = { };
3379 ssize_t ret;
3380 do {
3381 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3382 if (ret >= 0)
3383 break;
3384 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3385 } while (exception.retry);
3386 return ret;
3387}
3388
3389static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3390{
3391 struct nfs_server *server = NFS_SERVER(inode);
3392 int ret;
3393
3394 if (!nfs4_server_supports_acls(server))
3395 return -EOPNOTSUPP;
3396 ret = nfs_revalidate_inode(server, inode);
3397 if (ret < 0)
3398 return ret;
3399 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3400 nfs_zap_acl_cache(inode);
3401 ret = nfs4_read_cached_acl(inode, buf, buflen);
3402 if (ret != -ENOENT)
3403 return ret;
3404 return nfs4_get_acl_uncached(inode, buf, buflen);
3405}
3406
3407static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3408{
3409 struct nfs_server *server = NFS_SERVER(inode);
3410 struct page *pages[NFS4ACL_MAXPAGES];
3411 struct nfs_setaclargs arg = {
3412 .fh = NFS_FH(inode),
3413 .acl_pages = pages,
3414 .acl_len = buflen,
3415 };
3416 struct nfs_setaclres res;
3417 struct rpc_message msg = {
3418 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3419 .rpc_argp = &arg,
3420 .rpc_resp = &res,
3421 };
3422 int ret;
3423
3424 if (!nfs4_server_supports_acls(server))
3425 return -EOPNOTSUPP;
3426 nfs_inode_return_delegation(inode);
3427 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3428 ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3429 /*
3430 * Acl update can result in inode attribute update.
3431 * so mark the attribute cache invalid.
3432 */
3433 spin_lock(&inode->i_lock);
3434 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3435 spin_unlock(&inode->i_lock);
3436 nfs_access_zap_cache(inode);
3437 nfs_zap_acl_cache(inode);
3438 return ret;
3439}
3440
3441static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3442{
3443 struct nfs4_exception exception = { };
3444 int err;
3445 do {
3446 err = nfs4_handle_exception(NFS_SERVER(inode),
3447 __nfs4_proc_set_acl(inode, buf, buflen),
3448 &exception);
3449 } while (exception.retry);
3450 return err;
3451}
3452
3453static int
3454nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3455{
3456 struct nfs_client *clp = server->nfs_client;
3457
3458 if (task->tk_status >= 0)
3459 return 0;
3460 switch(task->tk_status) {
3461 case -NFS4ERR_ADMIN_REVOKED:
3462 case -NFS4ERR_BAD_STATEID:
3463 case -NFS4ERR_OPENMODE:
3464 if (state == NULL)
3465 break;
3466 nfs4_state_mark_reclaim_nograce(clp, state);
3467 goto do_state_recovery;
3468 case -NFS4ERR_STALE_STATEID:
3469 case -NFS4ERR_STALE_CLIENTID:
3470 case -NFS4ERR_EXPIRED:
3471 goto do_state_recovery;
3472#if defined(CONFIG_NFS_V4_1)
3473 case -NFS4ERR_BADSESSION:
3474 case -NFS4ERR_BADSLOT:
3475 case -NFS4ERR_BAD_HIGH_SLOT:
3476 case -NFS4ERR_DEADSESSION:
3477 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3478 case -NFS4ERR_SEQ_FALSE_RETRY:
3479 case -NFS4ERR_SEQ_MISORDERED:
3480 dprintk("%s ERROR %d, Reset session\n", __func__,
3481 task->tk_status);
3482 nfs4_schedule_state_recovery(clp);
3483 task->tk_status = 0;
3484 return -EAGAIN;
3485#endif /* CONFIG_NFS_V4_1 */
3486 case -NFS4ERR_DELAY:
3487 nfs_inc_server_stats(server, NFSIOS_DELAY);
3488 case -NFS4ERR_GRACE:
3489 case -EKEYEXPIRED:
3490 rpc_delay(task, NFS4_POLL_RETRY_MAX);
3491 task->tk_status = 0;
3492 return -EAGAIN;
3493 case -NFS4ERR_OLD_STATEID:
3494 task->tk_status = 0;
3495 return -EAGAIN;
3496 }
3497 task->tk_status = nfs4_map_errors(task->tk_status);
3498 return 0;
3499do_state_recovery:
3500 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3501 nfs4_schedule_state_recovery(clp);
3502 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3503 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3504 task->tk_status = 0;
3505 return -EAGAIN;
3506}
3507
3508int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3509 unsigned short port, struct rpc_cred *cred,
3510 struct nfs4_setclientid_res *res)
3511{
3512 nfs4_verifier sc_verifier;
3513 struct nfs4_setclientid setclientid = {
3514 .sc_verifier = &sc_verifier,
3515 .sc_prog = program,
3516 .sc_cb_ident = clp->cl_cb_ident,
3517 };
3518 struct rpc_message msg = {
3519 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3520 .rpc_argp = &setclientid,
3521 .rpc_resp = res,
3522 .rpc_cred = cred,
3523 };
3524 __be32 *p;
3525 int loop = 0;
3526 int status;
3527
3528 p = (__be32*)sc_verifier.data;
3529 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3530 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3531
3532 for(;;) {
3533 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3534 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3535 clp->cl_ipaddr,
3536 rpc_peeraddr2str(clp->cl_rpcclient,
3537 RPC_DISPLAY_ADDR),
3538 rpc_peeraddr2str(clp->cl_rpcclient,
3539 RPC_DISPLAY_PROTO),
3540 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3541 clp->cl_id_uniquifier);
3542 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3543 sizeof(setclientid.sc_netid),
3544 rpc_peeraddr2str(clp->cl_rpcclient,
3545 RPC_DISPLAY_NETID));
3546 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3547 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3548 clp->cl_ipaddr, port >> 8, port & 255);
3549
3550 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3551 if (status != -NFS4ERR_CLID_INUSE)
3552 break;
3553 if (signalled())
3554 break;
3555 if (loop++ & 1)
3556 ssleep(clp->cl_lease_time / HZ + 1);
3557 else
3558 if (++clp->cl_id_uniquifier == 0)
3559 break;
3560 }
3561 return status;
3562}
3563
3564static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3565 struct nfs4_setclientid_res *arg,
3566 struct rpc_cred *cred)
3567{
3568 struct nfs_fsinfo fsinfo;
3569 struct rpc_message msg = {
3570 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3571 .rpc_argp = arg,
3572 .rpc_resp = &fsinfo,
3573 .rpc_cred = cred,
3574 };
3575 unsigned long now;
3576 int status;
3577
3578 now = jiffies;
3579 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3580 if (status == 0) {
3581 spin_lock(&clp->cl_lock);
3582 clp->cl_lease_time = fsinfo.lease_time * HZ;
3583 clp->cl_last_renewal = now;
3584 spin_unlock(&clp->cl_lock);
3585 }
3586 return status;
3587}
3588
3589int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3590 struct nfs4_setclientid_res *arg,
3591 struct rpc_cred *cred)
3592{
3593 long timeout = 0;
3594 int err;
3595 do {
3596 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3597 switch (err) {
3598 case 0:
3599 return err;
3600 case -NFS4ERR_RESOURCE:
3601 /* The IBM lawyers misread another document! */
3602 case -NFS4ERR_DELAY:
3603 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3604 }
3605 } while (err == 0);
3606 return err;
3607}
3608
3609struct nfs4_delegreturndata {
3610 struct nfs4_delegreturnargs args;
3611 struct nfs4_delegreturnres res;
3612 struct nfs_fh fh;
3613 nfs4_stateid stateid;
3614 unsigned long timestamp;
3615 struct nfs_fattr fattr;
3616 int rpc_status;
3617};
3618
3619static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3620{
3621 struct nfs4_delegreturndata *data = calldata;
3622
3623 if (!nfs4_sequence_done(task, &data->res.seq_res))
3624 return;
3625
3626 switch (task->tk_status) {
3627 case -NFS4ERR_STALE_STATEID:
3628 case -NFS4ERR_EXPIRED:
3629 case 0:
3630 renew_lease(data->res.server, data->timestamp);
3631 break;
3632 default:
3633 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3634 -EAGAIN) {
3635 nfs_restart_rpc(task, data->res.server->nfs_client);
3636 return;
3637 }
3638 }
3639 data->rpc_status = task->tk_status;
3640}
3641
3642static void nfs4_delegreturn_release(void *calldata)
3643{
3644 kfree(calldata);
3645}
3646
3647#if defined(CONFIG_NFS_V4_1)
3648static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3649{
3650 struct nfs4_delegreturndata *d_data;
3651
3652 d_data = (struct nfs4_delegreturndata *)data;
3653
3654 if (nfs4_setup_sequence(d_data->res.server,
3655 &d_data->args.seq_args,
3656 &d_data->res.seq_res, 1, task))
3657 return;
3658 rpc_call_start(task);
3659}
3660#endif /* CONFIG_NFS_V4_1 */
3661
3662static const struct rpc_call_ops nfs4_delegreturn_ops = {
3663#if defined(CONFIG_NFS_V4_1)
3664 .rpc_call_prepare = nfs4_delegreturn_prepare,
3665#endif /* CONFIG_NFS_V4_1 */
3666 .rpc_call_done = nfs4_delegreturn_done,
3667 .rpc_release = nfs4_delegreturn_release,
3668};
3669
3670static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3671{
3672 struct nfs4_delegreturndata *data;
3673 struct nfs_server *server = NFS_SERVER(inode);
3674 struct rpc_task *task;
3675 struct rpc_message msg = {
3676 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3677 .rpc_cred = cred,
3678 };
3679 struct rpc_task_setup task_setup_data = {
3680 .rpc_client = server->client,
3681 .rpc_message = &msg,
3682 .callback_ops = &nfs4_delegreturn_ops,
3683 .flags = RPC_TASK_ASYNC,
3684 };
3685 int status = 0;
3686
3687 data = kzalloc(sizeof(*data), GFP_NOFS);
3688 if (data == NULL)
3689 return -ENOMEM;
3690 data->args.fhandle = &data->fh;
3691 data->args.stateid = &data->stateid;
3692 data->args.bitmask = server->attr_bitmask;
3693 nfs_copy_fh(&data->fh, NFS_FH(inode));
3694 memcpy(&data->stateid, stateid, sizeof(data->stateid));
3695 data->res.fattr = &data->fattr;
3696 data->res.server = server;
3697 nfs_fattr_init(data->res.fattr);
3698 data->timestamp = jiffies;
3699 data->rpc_status = 0;
3700
3701 task_setup_data.callback_data = data;
3702 msg.rpc_argp = &data->args;
3703 msg.rpc_resp = &data->res;
3704 task = rpc_run_task(&task_setup_data);
3705 if (IS_ERR(task))
3706 return PTR_ERR(task);
3707 if (!issync)
3708 goto out;
3709 status = nfs4_wait_for_completion_rpc_task(task);
3710 if (status != 0)
3711 goto out;
3712 status = data->rpc_status;
3713 if (status != 0)
3714 goto out;
3715 nfs_refresh_inode(inode, &data->fattr);
3716out:
3717 rpc_put_task(task);
3718 return status;
3719}
3720
3721int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3722{
3723 struct nfs_server *server = NFS_SERVER(inode);
3724 struct nfs4_exception exception = { };
3725 int err;
3726 do {
3727 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3728 switch (err) {
3729 case -NFS4ERR_STALE_STATEID:
3730 case -NFS4ERR_EXPIRED:
3731 case 0:
3732 return 0;
3733 }
3734 err = nfs4_handle_exception(server, err, &exception);
3735 } while (exception.retry);
3736 return err;
3737}
3738
3739#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3740#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3741
3742/*
3743 * sleep, with exponential backoff, and retry the LOCK operation.
3744 */
3745static unsigned long
3746nfs4_set_lock_task_retry(unsigned long timeout)
3747{
3748 schedule_timeout_killable(timeout);
3749 timeout <<= 1;
3750 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3751 return NFS4_LOCK_MAXTIMEOUT;
3752 return timeout;
3753}
3754
3755static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3756{
3757 struct inode *inode = state->inode;
3758 struct nfs_server *server = NFS_SERVER(inode);
3759 struct nfs_client *clp = server->nfs_client;
3760 struct nfs_lockt_args arg = {
3761 .fh = NFS_FH(inode),
3762 .fl = request,
3763 };
3764 struct nfs_lockt_res res = {
3765 .denied = request,
3766 };
3767 struct rpc_message msg = {
3768 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3769 .rpc_argp = &arg,
3770 .rpc_resp = &res,
3771 .rpc_cred = state->owner->so_cred,
3772 };
3773 struct nfs4_lock_state *lsp;
3774 int status;
3775
3776 arg.lock_owner.clientid = clp->cl_clientid;
3777 status = nfs4_set_lock_state(state, request);
3778 if (status != 0)
3779 goto out;
3780 lsp = request->fl_u.nfs4_fl.owner;
3781 arg.lock_owner.id = lsp->ls_id.id;
3782 arg.lock_owner.s_dev = server->s_dev;
3783 status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3784 switch (status) {
3785 case 0:
3786 request->fl_type = F_UNLCK;
3787 break;
3788 case -NFS4ERR_DENIED:
3789 status = 0;
3790 }
3791 request->fl_ops->fl_release_private(request);
3792out:
3793 return status;
3794}
3795
3796static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3797{
3798 struct nfs4_exception exception = { };
3799 int err;
3800
3801 do {
3802 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3803 _nfs4_proc_getlk(state, cmd, request),
3804 &exception);
3805 } while (exception.retry);
3806 return err;
3807}
3808
3809static int do_vfs_lock(struct file *file, struct file_lock *fl)
3810{
3811 int res = 0;
3812 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3813 case FL_POSIX:
3814 res = posix_lock_file_wait(file, fl);
3815 break;
3816 case FL_FLOCK:
3817 res = flock_lock_file_wait(file, fl);
3818 break;
3819 default:
3820 BUG();
3821 }
3822 return res;
3823}
3824
3825struct nfs4_unlockdata {
3826 struct nfs_locku_args arg;
3827 struct nfs_locku_res res;
3828 struct nfs4_lock_state *lsp;
3829 struct nfs_open_context *ctx;
3830 struct file_lock fl;
3831 const struct nfs_server *server;
3832 unsigned long timestamp;
3833};
3834
3835static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3836 struct nfs_open_context *ctx,
3837 struct nfs4_lock_state *lsp,
3838 struct nfs_seqid *seqid)
3839{
3840 struct nfs4_unlockdata *p;
3841 struct inode *inode = lsp->ls_state->inode;
3842
3843 p = kzalloc(sizeof(*p), GFP_NOFS);
3844 if (p == NULL)
3845 return NULL;
3846 p->arg.fh = NFS_FH(inode);
3847 p->arg.fl = &p->fl;
3848 p->arg.seqid = seqid;
3849 p->res.seqid = seqid;
3850 p->arg.stateid = &lsp->ls_stateid;
3851 p->lsp = lsp;
3852 atomic_inc(&lsp->ls_count);
3853 /* Ensure we don't close file until we're done freeing locks! */
3854 p->ctx = get_nfs_open_context(ctx);
3855 memcpy(&p->fl, fl, sizeof(p->fl));
3856 p->server = NFS_SERVER(inode);
3857 return p;
3858}
3859
3860static void nfs4_locku_release_calldata(void *data)
3861{
3862 struct nfs4_unlockdata *calldata = data;
3863 nfs_free_seqid(calldata->arg.seqid);
3864 nfs4_put_lock_state(calldata->lsp);
3865 put_nfs_open_context(calldata->ctx);
3866 kfree(calldata);
3867}
3868
3869static void nfs4_locku_done(struct rpc_task *task, void *data)
3870{
3871 struct nfs4_unlockdata *calldata = data;
3872
3873 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3874 return;
3875 switch (task->tk_status) {
3876 case 0:
3877 memcpy(calldata->lsp->ls_stateid.data,
3878 calldata->res.stateid.data,
3879 sizeof(calldata->lsp->ls_stateid.data));
3880 renew_lease(calldata->server, calldata->timestamp);
3881 break;
3882 case -NFS4ERR_BAD_STATEID:
3883 case -NFS4ERR_OLD_STATEID:
3884 case -NFS4ERR_STALE_STATEID:
3885 case -NFS4ERR_EXPIRED:
3886 break;
3887 default:
3888 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3889 nfs_restart_rpc(task,
3890 calldata->server->nfs_client);
3891 }
3892}
3893
3894static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3895{
3896 struct nfs4_unlockdata *calldata = data;
3897
3898 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3899 return;
3900 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3901 /* Note: exit _without_ running nfs4_locku_done */
3902 task->tk_action = NULL;
3903 return;
3904 }
3905 calldata->timestamp = jiffies;
3906 if (nfs4_setup_sequence(calldata->server,
3907 &calldata->arg.seq_args,
3908 &calldata->res.seq_res, 1, task))
3909 return;
3910 rpc_call_start(task);
3911}
3912
3913static const struct rpc_call_ops nfs4_locku_ops = {
3914 .rpc_call_prepare = nfs4_locku_prepare,
3915 .rpc_call_done = nfs4_locku_done,
3916 .rpc_release = nfs4_locku_release_calldata,
3917};
3918
3919static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3920 struct nfs_open_context *ctx,
3921 struct nfs4_lock_state *lsp,
3922 struct nfs_seqid *seqid)
3923{
3924 struct nfs4_unlockdata *data;
3925 struct rpc_message msg = {
3926 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3927 .rpc_cred = ctx->cred,
3928 };
3929 struct rpc_task_setup task_setup_data = {
3930 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3931 .rpc_message = &msg,
3932 .callback_ops = &nfs4_locku_ops,
3933 .workqueue = nfsiod_workqueue,
3934 .flags = RPC_TASK_ASYNC,
3935 };
3936
3937 /* Ensure this is an unlock - when canceling a lock, the
3938 * canceled lock is passed in, and it won't be an unlock.
3939 */
3940 fl->fl_type = F_UNLCK;
3941
3942 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3943 if (data == NULL) {
3944 nfs_free_seqid(seqid);
3945 return ERR_PTR(-ENOMEM);
3946 }
3947
3948 msg.rpc_argp = &data->arg;
3949 msg.rpc_resp = &data->res;
3950 task_setup_data.callback_data = data;
3951 return rpc_run_task(&task_setup_data);
3952}
3953
3954static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3955{
3956 struct nfs_inode *nfsi = NFS_I(state->inode);
3957 struct nfs_seqid *seqid;
3958 struct nfs4_lock_state *lsp;
3959 struct rpc_task *task;
3960 int status = 0;
3961 unsigned char fl_flags = request->fl_flags;
3962
3963 status = nfs4_set_lock_state(state, request);
3964 /* Unlock _before_ we do the RPC call */
3965 request->fl_flags |= FL_EXISTS;
3966 down_read(&nfsi->rwsem);
3967 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3968 up_read(&nfsi->rwsem);
3969 goto out;
3970 }
3971 up_read(&nfsi->rwsem);
3972 if (status != 0)
3973 goto out;
3974 /* Is this a delegated lock? */
3975 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3976 goto out;
3977 lsp = request->fl_u.nfs4_fl.owner;
3978 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3979 status = -ENOMEM;
3980 if (seqid == NULL)
3981 goto out;
3982 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3983 status = PTR_ERR(task);
3984 if (IS_ERR(task))
3985 goto out;
3986 status = nfs4_wait_for_completion_rpc_task(task);
3987 rpc_put_task(task);
3988out:
3989 request->fl_flags = fl_flags;
3990 return status;
3991}
3992
3993struct nfs4_lockdata {
3994 struct nfs_lock_args arg;
3995 struct nfs_lock_res res;
3996 struct nfs4_lock_state *lsp;
3997 struct nfs_open_context *ctx;
3998 struct file_lock fl;
3999 unsigned long timestamp;
4000 int rpc_status;
4001 int cancelled;
4002 struct nfs_server *server;
4003};
4004
4005static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4006 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4007 gfp_t gfp_mask)
4008{
4009 struct nfs4_lockdata *p;
4010 struct inode *inode = lsp->ls_state->inode;
4011 struct nfs_server *server = NFS_SERVER(inode);
4012
4013 p = kzalloc(sizeof(*p), gfp_mask);
4014 if (p == NULL)
4015 return NULL;
4016
4017 p->arg.fh = NFS_FH(inode);
4018 p->arg.fl = &p->fl;
4019 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4020 if (p->arg.open_seqid == NULL)
4021 goto out_free;
4022 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4023 if (p->arg.lock_seqid == NULL)
4024 goto out_free_seqid;
4025 p->arg.lock_stateid = &lsp->ls_stateid;
4026 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4027 p->arg.lock_owner.id = lsp->ls_id.id;
4028 p->arg.lock_owner.s_dev = server->s_dev;
4029 p->res.lock_seqid = p->arg.lock_seqid;
4030 p->lsp = lsp;
4031 p->server = server;
4032 atomic_inc(&lsp->ls_count);
4033 p->ctx = get_nfs_open_context(ctx);
4034 memcpy(&p->fl, fl, sizeof(p->fl));
4035 return p;
4036out_free_seqid:
4037 nfs_free_seqid(p->arg.open_seqid);
4038out_free:
4039 kfree(p);
4040 return NULL;
4041}
4042
4043static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4044{
4045 struct nfs4_lockdata *data = calldata;
4046 struct nfs4_state *state = data->lsp->ls_state;
4047
4048 dprintk("%s: begin!\n", __func__);
4049 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4050 return;
4051 /* Do we need to do an open_to_lock_owner? */
4052 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4053 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4054 return;
4055 data->arg.open_stateid = &state->stateid;
4056 data->arg.new_lock_owner = 1;
4057 data->res.open_seqid = data->arg.open_seqid;
4058 } else
4059 data->arg.new_lock_owner = 0;
4060 data->timestamp = jiffies;
4061 if (nfs4_setup_sequence(data->server,
4062 &data->arg.seq_args,
4063 &data->res.seq_res, 1, task))
4064 return;
4065 rpc_call_start(task);
4066 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4067}
4068
4069static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4070{
4071 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4072 nfs4_lock_prepare(task, calldata);
4073}
4074
4075static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4076{
4077 struct nfs4_lockdata *data = calldata;
4078
4079 dprintk("%s: begin!\n", __func__);
4080
4081 if (!nfs4_sequence_done(task, &data->res.seq_res))
4082 return;
4083
4084 data->rpc_status = task->tk_status;
4085 if (data->arg.new_lock_owner != 0) {
4086 if (data->rpc_status == 0)
4087 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4088 else
4089 goto out;
4090 }
4091 if (data->rpc_status == 0) {
4092 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4093 sizeof(data->lsp->ls_stateid.data));
4094 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4095 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4096 }
4097out:
4098 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4099}
4100
4101static void nfs4_lock_release(void *calldata)
4102{
4103 struct nfs4_lockdata *data = calldata;
4104
4105 dprintk("%s: begin!\n", __func__);
4106 nfs_free_seqid(data->arg.open_seqid);
4107 if (data->cancelled != 0) {
4108 struct rpc_task *task;
4109 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4110 data->arg.lock_seqid);
4111 if (!IS_ERR(task))
4112 rpc_put_task(task);
4113 dprintk("%s: cancelling lock!\n", __func__);
4114 } else
4115 nfs_free_seqid(data->arg.lock_seqid);
4116 nfs4_put_lock_state(data->lsp);
4117 put_nfs_open_context(data->ctx);
4118 kfree(data);
4119 dprintk("%s: done!\n", __func__);
4120}
4121
4122static const struct rpc_call_ops nfs4_lock_ops = {
4123 .rpc_call_prepare = nfs4_lock_prepare,
4124 .rpc_call_done = nfs4_lock_done,
4125 .rpc_release = nfs4_lock_release,
4126};
4127
4128static const struct rpc_call_ops nfs4_recover_lock_ops = {
4129 .rpc_call_prepare = nfs4_recover_lock_prepare,
4130 .rpc_call_done = nfs4_lock_done,
4131 .rpc_release = nfs4_lock_release,
4132};
4133
4134static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4135{
4136 struct nfs_client *clp = server->nfs_client;
4137 struct nfs4_state *state = lsp->ls_state;
4138
4139 switch (error) {
4140 case -NFS4ERR_ADMIN_REVOKED:
4141 case -NFS4ERR_BAD_STATEID:
4142 case -NFS4ERR_EXPIRED:
4143 if (new_lock_owner != 0 ||
4144 (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4145 nfs4_state_mark_reclaim_nograce(clp, state);
4146 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4147 break;
4148 case -NFS4ERR_STALE_STATEID:
4149 if (new_lock_owner != 0 ||
4150 (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4151 nfs4_state_mark_reclaim_reboot(clp, state);
4152 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4153 };
4154}
4155
4156static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4157{
4158 struct nfs4_lockdata *data;
4159 struct rpc_task *task;
4160 struct rpc_message msg = {
4161 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4162 .rpc_cred = state->owner->so_cred,
4163 };
4164 struct rpc_task_setup task_setup_data = {
4165 .rpc_client = NFS_CLIENT(state->inode),
4166 .rpc_message = &msg,
4167 .callback_ops = &nfs4_lock_ops,
4168 .workqueue = nfsiod_workqueue,
4169 .flags = RPC_TASK_ASYNC,
4170 };
4171 int ret;
4172
4173 dprintk("%s: begin!\n", __func__);
4174 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4175 fl->fl_u.nfs4_fl.owner,
4176 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4177 if (data == NULL)
4178 return -ENOMEM;
4179 if (IS_SETLKW(cmd))
4180 data->arg.block = 1;
4181 if (recovery_type > NFS_LOCK_NEW) {
4182 if (recovery_type == NFS_LOCK_RECLAIM)
4183 data->arg.reclaim = NFS_LOCK_RECLAIM;
4184 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4185 }
4186 msg.rpc_argp = &data->arg;
4187 msg.rpc_resp = &data->res;
4188 task_setup_data.callback_data = data;
4189 task = rpc_run_task(&task_setup_data);
4190 if (IS_ERR(task))
4191 return PTR_ERR(task);
4192 ret = nfs4_wait_for_completion_rpc_task(task);
4193 if (ret == 0) {
4194 ret = data->rpc_status;
4195 if (ret)
4196 nfs4_handle_setlk_error(data->server, data->lsp,
4197 data->arg.new_lock_owner, ret);
4198 } else
4199 data->cancelled = 1;
4200 rpc_put_task(task);
4201 dprintk("%s: done, ret = %d!\n", __func__, ret);
4202 return ret;
4203}
4204
4205static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4206{
4207 struct nfs_server *server = NFS_SERVER(state->inode);
4208 struct nfs4_exception exception = { };
4209 int err;
4210
4211 do {
4212 /* Cache the lock if possible... */
4213 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4214 return 0;
4215 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4216 if (err != -NFS4ERR_DELAY)
4217 break;
4218 nfs4_handle_exception(server, err, &exception);
4219 } while (exception.retry);
4220 return err;
4221}
4222
4223static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4224{
4225 struct nfs_server *server = NFS_SERVER(state->inode);
4226 struct nfs4_exception exception = { };
4227 int err;
4228
4229 err = nfs4_set_lock_state(state, request);
4230 if (err != 0)
4231 return err;
4232 do {
4233 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4234 return 0;
4235 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4236 switch (err) {
4237 default:
4238 goto out;
4239 case -NFS4ERR_GRACE:
4240 case -NFS4ERR_DELAY:
4241 nfs4_handle_exception(server, err, &exception);
4242 err = 0;
4243 }
4244 } while (exception.retry);
4245out:
4246 return err;
4247}
4248
4249static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4250{
4251 struct nfs_inode *nfsi = NFS_I(state->inode);
4252 unsigned char fl_flags = request->fl_flags;
4253 int status = -ENOLCK;
4254
4255 if ((fl_flags & FL_POSIX) &&
4256 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4257 goto out;
4258 /* Is this a delegated open? */
4259 status = nfs4_set_lock_state(state, request);
4260 if (status != 0)
4261 goto out;
4262 request->fl_flags |= FL_ACCESS;
4263 status = do_vfs_lock(request->fl_file, request);
4264 if (status < 0)
4265 goto out;
4266 down_read(&nfsi->rwsem);
4267 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4268 /* Yes: cache locks! */
4269 /* ...but avoid races with delegation recall... */
4270 request->fl_flags = fl_flags & ~FL_SLEEP;
4271 status = do_vfs_lock(request->fl_file, request);
4272 goto out_unlock;
4273 }
4274 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4275 if (status != 0)
4276 goto out_unlock;
4277 /* Note: we always want to sleep here! */
4278 request->fl_flags = fl_flags | FL_SLEEP;
4279 if (do_vfs_lock(request->fl_file, request) < 0)
4280 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4281out_unlock:
4282 up_read(&nfsi->rwsem);
4283out:
4284 request->fl_flags = fl_flags;
4285 return status;
4286}
4287
4288static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4289{
4290 struct nfs4_exception exception = { };
4291 int err;
4292
4293 do {
4294 err = _nfs4_proc_setlk(state, cmd, request);
4295 if (err == -NFS4ERR_DENIED)
4296 err = -EAGAIN;
4297 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4298 err, &exception);
4299 } while (exception.retry);
4300 return err;
4301}
4302
4303static int
4304nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4305{
4306 struct nfs_open_context *ctx;
4307 struct nfs4_state *state;
4308 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4309 int status;
4310
4311 /* verify open state */
4312 ctx = nfs_file_open_context(filp);
4313 state = ctx->state;
4314
4315 if (request->fl_start < 0 || request->fl_end < 0)
4316 return -EINVAL;
4317
4318 if (IS_GETLK(cmd)) {
4319 if (state != NULL)
4320 return nfs4_proc_getlk(state, F_GETLK, request);
4321 return 0;
4322 }
4323
4324 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4325 return -EINVAL;
4326
4327 if (request->fl_type == F_UNLCK) {
4328 if (state != NULL)
4329 return nfs4_proc_unlck(state, cmd, request);
4330 return 0;
4331 }
4332
4333 if (state == NULL)
4334 return -ENOLCK;
4335 do {
4336 status = nfs4_proc_setlk(state, cmd, request);
4337 if ((status != -EAGAIN) || IS_SETLK(cmd))
4338 break;
4339 timeout = nfs4_set_lock_task_retry(timeout);
4340 status = -ERESTARTSYS;
4341 if (signalled())
4342 break;
4343 } while(status < 0);
4344 return status;
4345}
4346
4347int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4348{
4349 struct nfs_server *server = NFS_SERVER(state->inode);
4350 struct nfs4_exception exception = { };
4351 int err;
4352
4353 err = nfs4_set_lock_state(state, fl);
4354 if (err != 0)
4355 goto out;
4356 do {
4357 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4358 switch (err) {
4359 default:
4360 printk(KERN_ERR "%s: unhandled error %d.\n",
4361 __func__, err);
4362 case 0:
4363 case -ESTALE:
4364 goto out;
4365 case -NFS4ERR_EXPIRED:
4366 case -NFS4ERR_STALE_CLIENTID:
4367 case -NFS4ERR_STALE_STATEID:
4368 case -NFS4ERR_BADSESSION:
4369 case -NFS4ERR_BADSLOT:
4370 case -NFS4ERR_BAD_HIGH_SLOT:
4371 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4372 case -NFS4ERR_DEADSESSION:
4373 nfs4_schedule_state_recovery(server->nfs_client);
4374 goto out;
4375 case -ERESTARTSYS:
4376 /*
4377 * The show must go on: exit, but mark the
4378 * stateid as needing recovery.
4379 */
4380 case -NFS4ERR_ADMIN_REVOKED:
4381 case -NFS4ERR_BAD_STATEID:
4382 case -NFS4ERR_OPENMODE:
4383 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4384 err = 0;
4385 goto out;
4386 case -EKEYEXPIRED:
4387 /*
4388 * User RPCSEC_GSS context has expired.
4389 * We cannot recover this stateid now, so
4390 * skip it and allow recovery thread to
4391 * proceed.
4392 */
4393 err = 0;
4394 goto out;
4395 case -ENOMEM:
4396 case -NFS4ERR_DENIED:
4397 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4398 err = 0;
4399 goto out;
4400 case -NFS4ERR_DELAY:
4401 break;
4402 }
4403 err = nfs4_handle_exception(server, err, &exception);
4404 } while (exception.retry);
4405out:
4406 return err;
4407}
4408
4409static void nfs4_release_lockowner_release(void *calldata)
4410{
4411 kfree(calldata);
4412}
4413
4414const struct rpc_call_ops nfs4_release_lockowner_ops = {
4415 .rpc_release = nfs4_release_lockowner_release,
4416};
4417
4418void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4419{
4420 struct nfs_server *server = lsp->ls_state->owner->so_server;
4421 struct nfs_release_lockowner_args *args;
4422 struct rpc_message msg = {
4423 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4424 };
4425
4426 if (server->nfs_client->cl_mvops->minor_version != 0)
4427 return;
4428 args = kmalloc(sizeof(*args), GFP_NOFS);
4429 if (!args)
4430 return;
4431 args->lock_owner.clientid = server->nfs_client->cl_clientid;
4432 args->lock_owner.id = lsp->ls_id.id;
4433 args->lock_owner.s_dev = server->s_dev;
4434 msg.rpc_argp = args;
4435 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4436}
4437
4438#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4439
4440static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4441 const void *buf, size_t buflen,
4442 int flags, int type)
4443{
4444 if (strcmp(key, "") != 0)
4445 return -EINVAL;
4446
4447 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4448}
4449
4450static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4451 void *buf, size_t buflen, int type)
4452{
4453 if (strcmp(key, "") != 0)
4454 return -EINVAL;
4455
4456 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4457}
4458
4459static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4460 size_t list_len, const char *name,
4461 size_t name_len, int type)
4462{
4463 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4464
4465 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4466 return 0;
4467
4468 if (list && len <= list_len)
4469 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4470 return len;
4471}
4472
4473static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4474{
4475 if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4476 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4477 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4478 return;
4479
4480 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4481 NFS_ATTR_FATTR_NLINK;
4482 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4483 fattr->nlink = 2;
4484}
4485
4486int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4487 struct nfs4_fs_locations *fs_locations, struct page *page)
4488{
4489 struct nfs_server *server = NFS_SERVER(dir);
4490 u32 bitmask[2] = {
4491 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4492 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4493 };
4494 struct nfs4_fs_locations_arg args = {
4495 .dir_fh = NFS_FH(dir),
4496 .name = name,
4497 .page = page,
4498 .bitmask = bitmask,
4499 };
4500 struct nfs4_fs_locations_res res = {
4501 .fs_locations = fs_locations,
4502 };
4503 struct rpc_message msg = {
4504 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4505 .rpc_argp = &args,
4506 .rpc_resp = &res,
4507 };
4508 int status;
4509
4510 dprintk("%s: start\n", __func__);
4511 nfs_fattr_init(&fs_locations->fattr);
4512 fs_locations->server = server;
4513 fs_locations->nlocations = 0;
4514 status = nfs4_call_sync(server, &msg, &args, &res, 0);
4515 nfs_fixup_referral_attributes(&fs_locations->fattr);
4516 dprintk("%s: returned status = %d\n", __func__, status);
4517 return status;
4518}
4519
4520#ifdef CONFIG_NFS_V4_1
4521/*
4522 * nfs4_proc_exchange_id()
4523 *
4524 * Since the clientid has expired, all compounds using sessions
4525 * associated with the stale clientid will be returning
4526 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4527 * be in some phase of session reset.
4528 */
4529int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4530{
4531 nfs4_verifier verifier;
4532 struct nfs41_exchange_id_args args = {
4533 .client = clp,
4534 .flags = clp->cl_exchange_flags,
4535 };
4536 struct nfs41_exchange_id_res res = {
4537 .client = clp,
4538 };
4539 int status;
4540 struct rpc_message msg = {
4541 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4542 .rpc_argp = &args,
4543 .rpc_resp = &res,
4544 .rpc_cred = cred,
4545 };
4546 __be32 *p;
4547
4548 dprintk("--> %s\n", __func__);
4549 BUG_ON(clp == NULL);
4550
4551 /* Remove server-only flags */
4552 args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4553
4554 p = (u32 *)verifier.data;
4555 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4556 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4557 args.verifier = &verifier;
4558
4559 while (1) {
4560 args.id_len = scnprintf(args.id, sizeof(args.id),
4561 "%s/%s %u",
4562 clp->cl_ipaddr,
4563 rpc_peeraddr2str(clp->cl_rpcclient,
4564 RPC_DISPLAY_ADDR),
4565 clp->cl_id_uniquifier);
4566
4567 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4568
4569 if (status != -NFS4ERR_CLID_INUSE)
4570 break;
4571
4572 if (signalled())
4573 break;
4574
4575 if (++clp->cl_id_uniquifier == 0)
4576 break;
4577 }
4578
4579 dprintk("<-- %s status= %d\n", __func__, status);
4580 return status;
4581}
4582
4583struct nfs4_get_lease_time_data {
4584 struct nfs4_get_lease_time_args *args;
4585 struct nfs4_get_lease_time_res *res;
4586 struct nfs_client *clp;
4587};
4588
4589static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4590 void *calldata)
4591{
4592 int ret;
4593 struct nfs4_get_lease_time_data *data =
4594 (struct nfs4_get_lease_time_data *)calldata;
4595
4596 dprintk("--> %s\n", __func__);
4597 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4598 /* just setup sequence, do not trigger session recovery
4599 since we're invoked within one */
4600 ret = nfs41_setup_sequence(data->clp->cl_session,
4601 &data->args->la_seq_args,
4602 &data->res->lr_seq_res, 0, task);
4603
4604 BUG_ON(ret == -EAGAIN);
4605 rpc_call_start(task);
4606 dprintk("<-- %s\n", __func__);
4607}
4608
4609/*
4610 * Called from nfs4_state_manager thread for session setup, so don't recover
4611 * from sequence operation or clientid errors.
4612 */
4613static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4614{
4615 struct nfs4_get_lease_time_data *data =
4616 (struct nfs4_get_lease_time_data *)calldata;
4617
4618 dprintk("--> %s\n", __func__);
4619 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4620 return;
4621 switch (task->tk_status) {
4622 case -NFS4ERR_DELAY:
4623 case -NFS4ERR_GRACE:
4624 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4625 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4626 task->tk_status = 0;
4627 nfs_restart_rpc(task, data->clp);
4628 return;
4629 }
4630 dprintk("<-- %s\n", __func__);
4631}
4632
4633struct rpc_call_ops nfs4_get_lease_time_ops = {
4634 .rpc_call_prepare = nfs4_get_lease_time_prepare,
4635 .rpc_call_done = nfs4_get_lease_time_done,
4636};
4637
4638int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4639{
4640 struct rpc_task *task;
4641 struct nfs4_get_lease_time_args args;
4642 struct nfs4_get_lease_time_res res = {
4643 .lr_fsinfo = fsinfo,
4644 };
4645 struct nfs4_get_lease_time_data data = {
4646 .args = &args,
4647 .res = &res,
4648 .clp = clp,
4649 };
4650 struct rpc_message msg = {
4651 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4652 .rpc_argp = &args,
4653 .rpc_resp = &res,
4654 };
4655 struct rpc_task_setup task_setup = {
4656 .rpc_client = clp->cl_rpcclient,
4657 .rpc_message = &msg,
4658 .callback_ops = &nfs4_get_lease_time_ops,
4659 .callback_data = &data
4660 };
4661 int status;
4662
4663 dprintk("--> %s\n", __func__);
4664 task = rpc_run_task(&task_setup);
4665
4666 if (IS_ERR(task))
4667 status = PTR_ERR(task);
4668 else {
4669 status = task->tk_status;
4670 rpc_put_task(task);
4671 }
4672 dprintk("<-- %s return %d\n", __func__, status);
4673
4674 return status;
4675}
4676
4677/*
4678 * Reset a slot table
4679 */
4680static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4681 int ivalue)
4682{
4683 struct nfs4_slot *new = NULL;
4684 int i;
4685 int ret = 0;
4686
4687 dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4688 max_reqs, tbl->max_slots);
4689
4690 /* Does the newly negotiated max_reqs match the existing slot table? */
4691 if (max_reqs != tbl->max_slots) {
4692 ret = -ENOMEM;
4693 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4694 GFP_NOFS);
4695 if (!new)
4696 goto out;
4697 ret = 0;
4698 kfree(tbl->slots);
4699 }
4700 spin_lock(&tbl->slot_tbl_lock);
4701 if (new) {
4702 tbl->slots = new;
4703 tbl->max_slots = max_reqs;
4704 }
4705 for (i = 0; i < tbl->max_slots; ++i)
4706 tbl->slots[i].seq_nr = ivalue;
4707 spin_unlock(&tbl->slot_tbl_lock);
4708 dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4709 tbl, tbl->slots, tbl->max_slots);
4710out:
4711 dprintk("<-- %s: return %d\n", __func__, ret);
4712 return ret;
4713}
4714
4715/*
4716 * Reset the forechannel and backchannel slot tables
4717 */
4718static int nfs4_reset_slot_tables(struct nfs4_session *session)
4719{
4720 int status;
4721
4722 status = nfs4_reset_slot_table(&session->fc_slot_table,
4723 session->fc_attrs.max_reqs, 1);
4724 if (status)
4725 return status;
4726
4727 status = nfs4_reset_slot_table(&session->bc_slot_table,
4728 session->bc_attrs.max_reqs, 0);
4729 return status;
4730}
4731
4732/* Destroy the slot table */
4733static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4734{
4735 if (session->fc_slot_table.slots != NULL) {
4736 kfree(session->fc_slot_table.slots);
4737 session->fc_slot_table.slots = NULL;
4738 }
4739 if (session->bc_slot_table.slots != NULL) {
4740 kfree(session->bc_slot_table.slots);
4741 session->bc_slot_table.slots = NULL;
4742 }
4743 return;
4744}
4745
4746/*
4747 * Initialize slot table
4748 */
4749static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4750 int max_slots, int ivalue)
4751{
4752 struct nfs4_slot *slot;
4753 int ret = -ENOMEM;
4754
4755 BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4756
4757 dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4758
4759 slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4760 if (!slot)
4761 goto out;
4762 ret = 0;
4763
4764 spin_lock(&tbl->slot_tbl_lock);
4765 tbl->max_slots = max_slots;
4766 tbl->slots = slot;
4767 tbl->highest_used_slotid = -1; /* no slot is currently used */
4768 spin_unlock(&tbl->slot_tbl_lock);
4769 dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4770 tbl, tbl->slots, tbl->max_slots);
4771out:
4772 dprintk("<-- %s: return %d\n", __func__, ret);
4773 return ret;
4774}
4775
4776/*
4777 * Initialize the forechannel and backchannel tables
4778 */
4779static int nfs4_init_slot_tables(struct nfs4_session *session)
4780{
4781 struct nfs4_slot_table *tbl;
4782 int status = 0;
4783
4784 tbl = &session->fc_slot_table;
4785 if (tbl->slots == NULL) {
4786 status = nfs4_init_slot_table(tbl,
4787 session->fc_attrs.max_reqs, 1);
4788 if (status)
4789 return status;
4790 }
4791
4792 tbl = &session->bc_slot_table;
4793 if (tbl->slots == NULL) {
4794 status = nfs4_init_slot_table(tbl,
4795 session->bc_attrs.max_reqs, 0);
4796 if (status)
4797 nfs4_destroy_slot_tables(session);
4798 }
4799
4800 return status;
4801}
4802
4803struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4804{
4805 struct nfs4_session *session;
4806 struct nfs4_slot_table *tbl;
4807
4808 session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4809 if (!session)
4810 return NULL;
4811
4812 tbl = &session->fc_slot_table;
4813 tbl->highest_used_slotid = -1;
4814 spin_lock_init(&tbl->slot_tbl_lock);
4815 rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4816 init_completion(&tbl->complete);
4817
4818 tbl = &session->bc_slot_table;
4819 tbl->highest_used_slotid = -1;
4820 spin_lock_init(&tbl->slot_tbl_lock);
4821 rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4822 init_completion(&tbl->complete);
4823
4824 session->session_state = 1<<NFS4_SESSION_INITING;
4825
4826 session->clp = clp;
4827 return session;
4828}
4829
4830void nfs4_destroy_session(struct nfs4_session *session)
4831{
4832 nfs4_proc_destroy_session(session);
4833 dprintk("%s Destroy backchannel for xprt %p\n",
4834 __func__, session->clp->cl_rpcclient->cl_xprt);
4835 xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4836 NFS41_BC_MIN_CALLBACKS);
4837 nfs4_destroy_slot_tables(session);
4838 kfree(session);
4839}
4840
4841/*
4842 * Initialize the values to be used by the client in CREATE_SESSION
4843 * If nfs4_init_session set the fore channel request and response sizes,
4844 * use them.
4845 *
4846 * Set the back channel max_resp_sz_cached to zero to force the client to
4847 * always set csa_cachethis to FALSE because the current implementation
4848 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4849 */
4850static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4851{
4852 struct nfs4_session *session = args->client->cl_session;
4853 unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4854 mxresp_sz = session->fc_attrs.max_resp_sz;
4855
4856 if (mxrqst_sz == 0)
4857 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4858 if (mxresp_sz == 0)
4859 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4860 /* Fore channel attributes */
4861 args->fc_attrs.headerpadsz = 0;
4862 args->fc_attrs.max_rqst_sz = mxrqst_sz;
4863 args->fc_attrs.max_resp_sz = mxresp_sz;
4864 args->fc_attrs.max_ops = NFS4_MAX_OPS;
4865 args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4866
4867 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4868 "max_ops=%u max_reqs=%u\n",
4869 __func__,
4870 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4871 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4872
4873 /* Back channel attributes */
4874 args->bc_attrs.headerpadsz = 0;
4875 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4876 args->bc_attrs.max_resp_sz = PAGE_SIZE;
4877 args->bc_attrs.max_resp_sz_cached = 0;
4878 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4879 args->bc_attrs.max_reqs = 1;
4880
4881 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4882 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4883 __func__,
4884 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4885 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4886 args->bc_attrs.max_reqs);
4887}
4888
4889static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4890{
4891 struct nfs4_channel_attrs *sent = &args->fc_attrs;
4892 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4893
4894 if (rcvd->headerpadsz > sent->headerpadsz)
4895 return -EINVAL;
4896 if (rcvd->max_resp_sz > sent->max_resp_sz)
4897 return -EINVAL;
4898 /*
4899 * Our requested max_ops is the minimum we need; we're not
4900 * prepared to break up compounds into smaller pieces than that.
4901 * So, no point even trying to continue if the server won't
4902 * cooperate:
4903 */
4904 if (rcvd->max_ops < sent->max_ops)
4905 return -EINVAL;
4906 if (rcvd->max_reqs == 0)
4907 return -EINVAL;
4908 return 0;
4909}
4910
4911static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4912{
4913 struct nfs4_channel_attrs *sent = &args->bc_attrs;
4914 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4915
4916 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4917 return -EINVAL;
4918 if (rcvd->max_resp_sz < sent->max_resp_sz)
4919 return -EINVAL;
4920 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4921 return -EINVAL;
4922 /* These would render the backchannel useless: */
4923 if (rcvd->max_ops == 0)
4924 return -EINVAL;
4925 if (rcvd->max_reqs == 0)
4926 return -EINVAL;
4927 return 0;
4928}
4929
4930static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4931 struct nfs4_session *session)
4932{
4933 int ret;
4934
4935 ret = nfs4_verify_fore_channel_attrs(args, session);
4936 if (ret)
4937 return ret;
4938 return nfs4_verify_back_channel_attrs(args, session);
4939}
4940
4941static int _nfs4_proc_create_session(struct nfs_client *clp)
4942{
4943 struct nfs4_session *session = clp->cl_session;
4944 struct nfs41_create_session_args args = {
4945 .client = clp,
4946 .cb_program = NFS4_CALLBACK,
4947 };
4948 struct nfs41_create_session_res res = {
4949 .client = clp,
4950 };
4951 struct rpc_message msg = {
4952 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4953 .rpc_argp = &args,
4954 .rpc_resp = &res,
4955 };
4956 int status;
4957
4958 nfs4_init_channel_attrs(&args);
4959 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4960
4961 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4962
4963 if (!status)
4964 /* Verify the session's negotiated channel_attrs values */
4965 status = nfs4_verify_channel_attrs(&args, session);
4966 if (!status) {
4967 /* Increment the clientid slot sequence id */
4968 clp->cl_seqid++;
4969 }
4970
4971 return status;
4972}
4973
4974/*
4975 * Issues a CREATE_SESSION operation to the server.
4976 * It is the responsibility of the caller to verify the session is
4977 * expired before calling this routine.
4978 */
4979int nfs4_proc_create_session(struct nfs_client *clp)
4980{
4981 int status;
4982 unsigned *ptr;
4983 struct nfs4_session *session = clp->cl_session;
4984
4985 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4986
4987 status = _nfs4_proc_create_session(clp);
4988 if (status)
4989 goto out;
4990
4991 /* Init and reset the fore channel */
4992 status = nfs4_init_slot_tables(session);
4993 dprintk("slot table initialization returned %d\n", status);
4994 if (status)
4995 goto out;
4996 status = nfs4_reset_slot_tables(session);
4997 dprintk("slot table reset returned %d\n", status);
4998 if (status)
4999 goto out;
5000
5001 ptr = (unsigned *)&session->sess_id.data[0];
5002 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5003 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5004out:
5005 dprintk("<-- %s\n", __func__);
5006 return status;
5007}
5008
5009/*
5010 * Issue the over-the-wire RPC DESTROY_SESSION.
5011 * The caller must serialize access to this routine.
5012 */
5013int nfs4_proc_destroy_session(struct nfs4_session *session)
5014{
5015 int status = 0;
5016 struct rpc_message msg;
5017
5018 dprintk("--> nfs4_proc_destroy_session\n");
5019
5020 /* session is still being setup */
5021 if (session->clp->cl_cons_state != NFS_CS_READY)
5022 return status;
5023
5024 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5025 msg.rpc_argp = session;
5026 msg.rpc_resp = NULL;
5027 msg.rpc_cred = NULL;
5028 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5029
5030 if (status)
5031 printk(KERN_WARNING
5032 "Got error %d from the server on DESTROY_SESSION. "
5033 "Session has been destroyed regardless...\n", status);
5034
5035 dprintk("<-- nfs4_proc_destroy_session\n");
5036 return status;
5037}
5038
5039int nfs4_init_session(struct nfs_server *server)
5040{
5041 struct nfs_client *clp = server->nfs_client;
5042 struct nfs4_session *session;
5043 unsigned int rsize, wsize;
5044 int ret;
5045
5046 if (!nfs4_has_session(clp))
5047 return 0;
5048
5049 session = clp->cl_session;
5050 if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5051 return 0;
5052
5053 rsize = server->rsize;
5054 if (rsize == 0)
5055 rsize = NFS_MAX_FILE_IO_SIZE;
5056 wsize = server->wsize;
5057 if (wsize == 0)
5058 wsize = NFS_MAX_FILE_IO_SIZE;
5059
5060 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5061 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5062
5063 ret = nfs4_recover_expired_lease(server);
5064 if (!ret)
5065 ret = nfs4_check_client_ready(clp);
5066 return ret;
5067}
5068
5069/*
5070 * Renew the cl_session lease.
5071 */
5072struct nfs4_sequence_data {
5073 struct nfs_client *clp;
5074 struct nfs4_sequence_args args;
5075 struct nfs4_sequence_res res;
5076};
5077
5078static void nfs41_sequence_release(void *data)
5079{
5080 struct nfs4_sequence_data *calldata = data;
5081 struct nfs_client *clp = calldata->clp;
5082
5083 if (atomic_read(&clp->cl_count) > 1)
5084 nfs4_schedule_state_renewal(clp);
5085 nfs_put_client(clp);
5086 kfree(calldata);
5087}
5088
5089static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5090{
5091 switch(task->tk_status) {
5092 case -NFS4ERR_DELAY:
5093 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5094 return -EAGAIN;
5095 default:
5096 nfs4_schedule_state_recovery(clp);
5097 }
5098 return 0;
5099}
5100
5101static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5102{
5103 struct nfs4_sequence_data *calldata = data;
5104 struct nfs_client *clp = calldata->clp;
5105
5106 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5107 return;
5108
5109 if (task->tk_status < 0) {
5110 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5111 if (atomic_read(&clp->cl_count) == 1)
5112 goto out;
5113
5114 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5115 rpc_restart_call_prepare(task);
5116 return;
5117 }
5118 }
5119 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5120out:
5121 dprintk("<-- %s\n", __func__);
5122}
5123
5124static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5125{
5126 struct nfs4_sequence_data *calldata = data;
5127 struct nfs_client *clp = calldata->clp;
5128 struct nfs4_sequence_args *args;
5129 struct nfs4_sequence_res *res;
5130
5131 args = task->tk_msg.rpc_argp;
5132 res = task->tk_msg.rpc_resp;
5133
5134 if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5135 return;
5136 rpc_call_start(task);
5137}
5138
5139static const struct rpc_call_ops nfs41_sequence_ops = {
5140 .rpc_call_done = nfs41_sequence_call_done,
5141 .rpc_call_prepare = nfs41_sequence_prepare,
5142 .rpc_release = nfs41_sequence_release,
5143};
5144
5145static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5146{
5147 struct nfs4_sequence_data *calldata;
5148 struct rpc_message msg = {
5149 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5150 .rpc_cred = cred,
5151 };
5152 struct rpc_task_setup task_setup_data = {
5153 .rpc_client = clp->cl_rpcclient,
5154 .rpc_message = &msg,
5155 .callback_ops = &nfs41_sequence_ops,
5156 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5157 };
5158
5159 if (!atomic_inc_not_zero(&clp->cl_count))
5160 return ERR_PTR(-EIO);
5161 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5162 if (calldata == NULL) {
5163 nfs_put_client(clp);
5164 return ERR_PTR(-ENOMEM);
5165 }
5166 msg.rpc_argp = &calldata->args;
5167 msg.rpc_resp = &calldata->res;
5168 calldata->clp = clp;
5169 task_setup_data.callback_data = calldata;
5170
5171 return rpc_run_task(&task_setup_data);
5172}
5173
5174static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5175{
5176 struct rpc_task *task;
5177 int ret = 0;
5178
5179 task = _nfs41_proc_sequence(clp, cred);
5180 if (IS_ERR(task))
5181 ret = PTR_ERR(task);
5182 else
5183 rpc_put_task(task);
5184 dprintk("<-- %s status=%d\n", __func__, ret);
5185 return ret;
5186}
5187
5188static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5189{
5190 struct rpc_task *task;
5191 int ret;
5192
5193 task = _nfs41_proc_sequence(clp, cred);
5194 if (IS_ERR(task)) {
5195 ret = PTR_ERR(task);
5196 goto out;
5197 }
5198 ret = rpc_wait_for_completion_task(task);
5199 if (!ret)
5200 ret = task->tk_status;
5201 rpc_put_task(task);
5202out:
5203 dprintk("<-- %s status=%d\n", __func__, ret);
5204 return ret;
5205}
5206
5207struct nfs4_reclaim_complete_data {
5208 struct nfs_client *clp;
5209 struct nfs41_reclaim_complete_args arg;
5210 struct nfs41_reclaim_complete_res res;
5211};
5212
5213static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5214{
5215 struct nfs4_reclaim_complete_data *calldata = data;
5216
5217 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5218 if (nfs41_setup_sequence(calldata->clp->cl_session,
5219 &calldata->arg.seq_args,
5220 &calldata->res.seq_res, 0, task))
5221 return;
5222
5223 rpc_call_start(task);
5224}
5225
5226static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5227{
5228 switch(task->tk_status) {
5229 case 0:
5230 case -NFS4ERR_COMPLETE_ALREADY:
5231 case -NFS4ERR_WRONG_CRED: /* What to do here? */
5232 break;
5233 case -NFS4ERR_DELAY:
5234 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5235 return -EAGAIN;
5236 default:
5237 nfs4_schedule_state_recovery(clp);
5238 }
5239 return 0;
5240}
5241
5242static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5243{
5244 struct nfs4_reclaim_complete_data *calldata = data;
5245 struct nfs_client *clp = calldata->clp;
5246 struct nfs4_sequence_res *res = &calldata->res.seq_res;
5247
5248 dprintk("--> %s\n", __func__);
5249 if (!nfs41_sequence_done(task, res))
5250 return;
5251
5252 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5253 rpc_restart_call_prepare(task);
5254 return;
5255 }
5256 dprintk("<-- %s\n", __func__);
5257}
5258
5259static void nfs4_free_reclaim_complete_data(void *data)
5260{
5261 struct nfs4_reclaim_complete_data *calldata = data;
5262
5263 kfree(calldata);
5264}
5265
5266static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5267 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5268 .rpc_call_done = nfs4_reclaim_complete_done,
5269 .rpc_release = nfs4_free_reclaim_complete_data,
5270};
5271
5272/*
5273 * Issue a global reclaim complete.
5274 */
5275static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5276{
5277 struct nfs4_reclaim_complete_data *calldata;
5278 struct rpc_task *task;
5279 struct rpc_message msg = {
5280 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5281 };
5282 struct rpc_task_setup task_setup_data = {
5283 .rpc_client = clp->cl_rpcclient,
5284 .rpc_message = &msg,
5285 .callback_ops = &nfs4_reclaim_complete_call_ops,
5286 .flags = RPC_TASK_ASYNC,
5287 };
5288 int status = -ENOMEM;
5289
5290 dprintk("--> %s\n", __func__);
5291 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5292 if (calldata == NULL)
5293 goto out;
5294 calldata->clp = clp;
5295 calldata->arg.one_fs = 0;
5296
5297 msg.rpc_argp = &calldata->arg;
5298 msg.rpc_resp = &calldata->res;
5299 task_setup_data.callback_data = calldata;
5300 task = rpc_run_task(&task_setup_data);
5301 if (IS_ERR(task)) {
5302 status = PTR_ERR(task);
5303 goto out;
5304 }
5305 rpc_put_task(task);
5306 return 0;
5307out:
5308 dprintk("<-- %s status=%d\n", __func__, status);
5309 return status;
5310}
5311
5312static void
5313nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5314{
5315 struct nfs4_layoutget *lgp = calldata;
5316 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5317
5318 dprintk("--> %s\n", __func__);
5319 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5320 * right now covering the LAYOUTGET we are about to send.
5321 * However, that is not so catastrophic, and there seems
5322 * to be no way to prevent it completely.
5323 */
5324 if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5325 &lgp->res.seq_res, 0, task))
5326 return;
5327 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5328 NFS_I(lgp->args.inode)->layout,
5329 lgp->args.ctx->state)) {
5330 rpc_exit(task, NFS4_OK);
5331 return;
5332 }
5333 rpc_call_start(task);
5334}
5335
5336static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5337{
5338 struct nfs4_layoutget *lgp = calldata;
5339 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5340
5341 dprintk("--> %s\n", __func__);
5342
5343 if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5344 return;
5345
5346 switch (task->tk_status) {
5347 case 0:
5348 break;
5349 case -NFS4ERR_LAYOUTTRYLATER:
5350 case -NFS4ERR_RECALLCONFLICT:
5351 task->tk_status = -NFS4ERR_DELAY;
5352 /* Fall through */
5353 default:
5354 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5355 rpc_restart_call_prepare(task);
5356 return;
5357 }
5358 }
5359 dprintk("<-- %s\n", __func__);
5360}
5361
5362static void nfs4_layoutget_release(void *calldata)
5363{
5364 struct nfs4_layoutget *lgp = calldata;
5365
5366 dprintk("--> %s\n", __func__);
5367 if (lgp->res.layout.buf != NULL)
5368 free_page((unsigned long) lgp->res.layout.buf);
5369 put_nfs_open_context(lgp->args.ctx);
5370 kfree(calldata);
5371 dprintk("<-- %s\n", __func__);
5372}
5373
5374static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5375 .rpc_call_prepare = nfs4_layoutget_prepare,
5376 .rpc_call_done = nfs4_layoutget_done,
5377 .rpc_release = nfs4_layoutget_release,
5378};
5379
5380int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5381{
5382 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5383 struct rpc_task *task;
5384 struct rpc_message msg = {
5385 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5386 .rpc_argp = &lgp->args,
5387 .rpc_resp = &lgp->res,
5388 };
5389 struct rpc_task_setup task_setup_data = {
5390 .rpc_client = server->client,
5391 .rpc_message = &msg,
5392 .callback_ops = &nfs4_layoutget_call_ops,
5393 .callback_data = lgp,
5394 .flags = RPC_TASK_ASYNC,
5395 };
5396 int status = 0;
5397
5398 dprintk("--> %s\n", __func__);
5399
5400 lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5401 if (lgp->res.layout.buf == NULL) {
5402 nfs4_layoutget_release(lgp);
5403 return -ENOMEM;
5404 }
5405
5406 lgp->res.seq_res.sr_slot = NULL;
5407 task = rpc_run_task(&task_setup_data);
5408 if (IS_ERR(task))
5409 return PTR_ERR(task);
5410 status = nfs4_wait_for_completion_rpc_task(task);
5411 if (status == 0)
5412 status = task->tk_status;
5413 if (status == 0)
5414 status = pnfs_layout_process(lgp);
5415 rpc_put_task(task);
5416 dprintk("<-- %s status=%d\n", __func__, status);
5417 return status;
5418}
5419
5420static int
5421_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5422{
5423 struct nfs4_getdeviceinfo_args args = {
5424 .pdev = pdev,
5425 };
5426 struct nfs4_getdeviceinfo_res res = {
5427 .pdev = pdev,
5428 };
5429 struct rpc_message msg = {
5430 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5431 .rpc_argp = &args,
5432 .rpc_resp = &res,
5433 };
5434 int status;
5435
5436 dprintk("--> %s\n", __func__);
5437 status = nfs4_call_sync(server, &msg, &args, &res, 0);
5438 dprintk("<-- %s status=%d\n", __func__, status);
5439
5440 return status;
5441}
5442
5443int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5444{
5445 struct nfs4_exception exception = { };
5446 int err;
5447
5448 do {
5449 err = nfs4_handle_exception(server,
5450 _nfs4_proc_getdeviceinfo(server, pdev),
5451 &exception);
5452 } while (exception.retry);
5453 return err;
5454}
5455EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5456
5457#endif /* CONFIG_NFS_V4_1 */
5458
5459struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5460 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5461 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5462 .recover_open = nfs4_open_reclaim,
5463 .recover_lock = nfs4_lock_reclaim,
5464 .establish_clid = nfs4_init_clientid,
5465 .get_clid_cred = nfs4_get_setclientid_cred,
5466};
5467
5468#if defined(CONFIG_NFS_V4_1)
5469struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5470 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5471 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5472 .recover_open = nfs4_open_reclaim,
5473 .recover_lock = nfs4_lock_reclaim,
5474 .establish_clid = nfs41_init_clientid,
5475 .get_clid_cred = nfs4_get_exchange_id_cred,
5476 .reclaim_complete = nfs41_proc_reclaim_complete,
5477};
5478#endif /* CONFIG_NFS_V4_1 */
5479
5480struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5481 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5482 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5483 .recover_open = nfs4_open_expired,
5484 .recover_lock = nfs4_lock_expired,
5485 .establish_clid = nfs4_init_clientid,
5486 .get_clid_cred = nfs4_get_setclientid_cred,
5487};
5488
5489#if defined(CONFIG_NFS_V4_1)
5490struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5491 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5492 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5493 .recover_open = nfs4_open_expired,
5494 .recover_lock = nfs4_lock_expired,
5495 .establish_clid = nfs41_init_clientid,
5496 .get_clid_cred = nfs4_get_exchange_id_cred,
5497};
5498#endif /* CONFIG_NFS_V4_1 */
5499
5500struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5501 .sched_state_renewal = nfs4_proc_async_renew,
5502 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5503 .renew_lease = nfs4_proc_renew,
5504};
5505
5506#if defined(CONFIG_NFS_V4_1)
5507struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5508 .sched_state_renewal = nfs41_proc_async_sequence,
5509 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5510 .renew_lease = nfs4_proc_sequence,
5511};
5512#endif
5513
5514static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5515 .minor_version = 0,
5516 .call_sync = _nfs4_call_sync,
5517 .validate_stateid = nfs4_validate_delegation_stateid,
5518 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5519 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5520 .state_renewal_ops = &nfs40_state_renewal_ops,
5521};
5522
5523#if defined(CONFIG_NFS_V4_1)
5524static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5525 .minor_version = 1,
5526 .call_sync = _nfs4_call_sync_session,
5527 .validate_stateid = nfs41_validate_delegation_stateid,
5528 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5529 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5530 .state_renewal_ops = &nfs41_state_renewal_ops,
5531};
5532#endif
5533
5534const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5535 [0] = &nfs_v4_0_minor_ops,
5536#if defined(CONFIG_NFS_V4_1)
5537 [1] = &nfs_v4_1_minor_ops,
5538#endif
5539};
5540
5541static const struct inode_operations nfs4_file_inode_operations = {
5542 .permission = nfs_permission,
5543 .getattr = nfs_getattr,
5544 .setattr = nfs_setattr,
5545 .getxattr = generic_getxattr,
5546 .setxattr = generic_setxattr,
5547 .listxattr = generic_listxattr,
5548 .removexattr = generic_removexattr,
5549};
5550
5551const struct nfs_rpc_ops nfs_v4_clientops = {
5552 .version = 4, /* protocol version */
5553 .dentry_ops = &nfs4_dentry_operations,
5554 .dir_inode_ops = &nfs4_dir_inode_operations,
5555 .file_inode_ops = &nfs4_file_inode_operations,
5556 .getroot = nfs4_proc_get_root,
5557 .getattr = nfs4_proc_getattr,
5558 .setattr = nfs4_proc_setattr,
5559 .lookupfh = nfs4_proc_lookupfh,
5560 .lookup = nfs4_proc_lookup,
5561 .access = nfs4_proc_access,
5562 .readlink = nfs4_proc_readlink,
5563 .create = nfs4_proc_create,
5564 .remove = nfs4_proc_remove,
5565 .unlink_setup = nfs4_proc_unlink_setup,
5566 .unlink_done = nfs4_proc_unlink_done,
5567 .rename = nfs4_proc_rename,
5568 .rename_setup = nfs4_proc_rename_setup,
5569 .rename_done = nfs4_proc_rename_done,
5570 .link = nfs4_proc_link,
5571 .symlink = nfs4_proc_symlink,
5572 .mkdir = nfs4_proc_mkdir,
5573 .rmdir = nfs4_proc_remove,
5574 .readdir = nfs4_proc_readdir,
5575 .mknod = nfs4_proc_mknod,
5576 .statfs = nfs4_proc_statfs,
5577 .fsinfo = nfs4_proc_fsinfo,
5578 .pathconf = nfs4_proc_pathconf,
5579 .set_capabilities = nfs4_server_capabilities,
5580 .decode_dirent = nfs4_decode_dirent,
5581 .read_setup = nfs4_proc_read_setup,
5582 .read_done = nfs4_read_done,
5583 .write_setup = nfs4_proc_write_setup,
5584 .write_done = nfs4_write_done,
5585 .commit_setup = nfs4_proc_commit_setup,
5586 .commit_done = nfs4_commit_done,
5587 .lock = nfs4_proc_lock,
5588 .clear_acl_cache = nfs4_zap_acl_attr,
5589 .close_context = nfs4_close_context,
5590 .open_context = nfs4_atomic_open,
5591};
5592
5593static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
5594 .prefix = XATTR_NAME_NFSV4_ACL,
5595 .list = nfs4_xattr_list_nfs4_acl,
5596 .get = nfs4_xattr_get_nfs4_acl,
5597 .set = nfs4_xattr_set_nfs4_acl,
5598};
5599
5600const struct xattr_handler *nfs4_xattr_handlers[] = {
5601 &nfs4_xattr_nfs4_acl_handler,
5602 NULL
5603};
5604
5605/*
5606 * Local variables:
5607 * c-basic-offset: 8
5608 * End:
5609 */
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