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NFS: Fix SECINFO_NO_NAME
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/delay.h>
40#include <linux/errno.h>
41#include <linux/string.h>
42#include <linux/ratelimit.h>
43#include <linux/printk.h>
44#include <linux/slab.h>
45#include <linux/sunrpc/clnt.h>
46#include <linux/sunrpc/gss_api.h>
47#include <linux/nfs.h>
48#include <linux/nfs4.h>
49#include <linux/nfs_fs.h>
50#include <linux/nfs_page.h>
51#include <linux/nfs_mount.h>
52#include <linux/namei.h>
53#include <linux/mount.h>
54#include <linux/module.h>
55#include <linux/nfs_idmap.h>
56#include <linux/sunrpc/bc_xprt.h>
57#include <linux/xattr.h>
58#include <linux/utsname.h>
59#include <linux/freezer.h>
60
61#include "nfs4_fs.h"
62#include "delegation.h"
63#include "internal.h"
64#include "iostat.h"
65#include "callback.h"
66#include "pnfs.h"
67
68#define NFSDBG_FACILITY NFSDBG_PROC
69
70#define NFS4_POLL_RETRY_MIN (HZ/10)
71#define NFS4_POLL_RETRY_MAX (15*HZ)
72
73#define NFS4_MAX_LOOP_ON_RECOVER (10)
74
75static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
76
77struct nfs4_opendata;
78static int _nfs4_proc_open(struct nfs4_opendata *data);
79static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
80static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
81static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
82static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
83static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
84static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
85 struct nfs_fattr *fattr, struct iattr *sattr,
86 struct nfs4_state *state);
87#ifdef CONFIG_NFS_V4_1
88static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
89static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
90#endif
91/* Prevent leaks of NFSv4 errors into userland */
92static int nfs4_map_errors(int err)
93{
94 if (err >= -1000)
95 return err;
96 switch (err) {
97 case -NFS4ERR_RESOURCE:
98 return -EREMOTEIO;
99 case -NFS4ERR_WRONGSEC:
100 return -EPERM;
101 case -NFS4ERR_BADOWNER:
102 case -NFS4ERR_BADNAME:
103 return -EINVAL;
104 default:
105 dprintk("%s could not handle NFSv4 error %d\n",
106 __func__, -err);
107 break;
108 }
109 return -EIO;
110}
111
112/*
113 * This is our standard bitmap for GETATTR requests.
114 */
115const u32 nfs4_fattr_bitmap[2] = {
116 FATTR4_WORD0_TYPE
117 | FATTR4_WORD0_CHANGE
118 | FATTR4_WORD0_SIZE
119 | FATTR4_WORD0_FSID
120 | FATTR4_WORD0_FILEID,
121 FATTR4_WORD1_MODE
122 | FATTR4_WORD1_NUMLINKS
123 | FATTR4_WORD1_OWNER
124 | FATTR4_WORD1_OWNER_GROUP
125 | FATTR4_WORD1_RAWDEV
126 | FATTR4_WORD1_SPACE_USED
127 | FATTR4_WORD1_TIME_ACCESS
128 | FATTR4_WORD1_TIME_METADATA
129 | FATTR4_WORD1_TIME_MODIFY
130};
131
132const u32 nfs4_statfs_bitmap[2] = {
133 FATTR4_WORD0_FILES_AVAIL
134 | FATTR4_WORD0_FILES_FREE
135 | FATTR4_WORD0_FILES_TOTAL,
136 FATTR4_WORD1_SPACE_AVAIL
137 | FATTR4_WORD1_SPACE_FREE
138 | FATTR4_WORD1_SPACE_TOTAL
139};
140
141const u32 nfs4_pathconf_bitmap[2] = {
142 FATTR4_WORD0_MAXLINK
143 | FATTR4_WORD0_MAXNAME,
144 0
145};
146
147const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
148 | FATTR4_WORD0_MAXREAD
149 | FATTR4_WORD0_MAXWRITE
150 | FATTR4_WORD0_LEASE_TIME,
151 FATTR4_WORD1_TIME_DELTA
152 | FATTR4_WORD1_FS_LAYOUT_TYPES,
153 FATTR4_WORD2_LAYOUT_BLKSIZE
154};
155
156const u32 nfs4_fs_locations_bitmap[2] = {
157 FATTR4_WORD0_TYPE
158 | FATTR4_WORD0_CHANGE
159 | FATTR4_WORD0_SIZE
160 | FATTR4_WORD0_FSID
161 | FATTR4_WORD0_FILEID
162 | FATTR4_WORD0_FS_LOCATIONS,
163 FATTR4_WORD1_MODE
164 | FATTR4_WORD1_NUMLINKS
165 | FATTR4_WORD1_OWNER
166 | FATTR4_WORD1_OWNER_GROUP
167 | FATTR4_WORD1_RAWDEV
168 | FATTR4_WORD1_SPACE_USED
169 | FATTR4_WORD1_TIME_ACCESS
170 | FATTR4_WORD1_TIME_METADATA
171 | FATTR4_WORD1_TIME_MODIFY
172 | FATTR4_WORD1_MOUNTED_ON_FILEID
173};
174
175static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
176 struct nfs4_readdir_arg *readdir)
177{
178 __be32 *start, *p;
179
180 BUG_ON(readdir->count < 80);
181 if (cookie > 2) {
182 readdir->cookie = cookie;
183 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
184 return;
185 }
186
187 readdir->cookie = 0;
188 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
189 if (cookie == 2)
190 return;
191
192 /*
193 * NFSv4 servers do not return entries for '.' and '..'
194 * Therefore, we fake these entries here. We let '.'
195 * have cookie 0 and '..' have cookie 1. Note that
196 * when talking to the server, we always send cookie 0
197 * instead of 1 or 2.
198 */
199 start = p = kmap_atomic(*readdir->pages);
200
201 if (cookie == 0) {
202 *p++ = xdr_one; /* next */
203 *p++ = xdr_zero; /* cookie, first word */
204 *p++ = xdr_one; /* cookie, second word */
205 *p++ = xdr_one; /* entry len */
206 memcpy(p, ".\0\0\0", 4); /* entry */
207 p++;
208 *p++ = xdr_one; /* bitmap length */
209 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
210 *p++ = htonl(8); /* attribute buffer length */
211 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
212 }
213
214 *p++ = xdr_one; /* next */
215 *p++ = xdr_zero; /* cookie, first word */
216 *p++ = xdr_two; /* cookie, second word */
217 *p++ = xdr_two; /* entry len */
218 memcpy(p, "..\0\0", 4); /* entry */
219 p++;
220 *p++ = xdr_one; /* bitmap length */
221 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
222 *p++ = htonl(8); /* attribute buffer length */
223 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
224
225 readdir->pgbase = (char *)p - (char *)start;
226 readdir->count -= readdir->pgbase;
227 kunmap_atomic(start);
228}
229
230static int nfs4_wait_clnt_recover(struct nfs_client *clp)
231{
232 int res;
233
234 might_sleep();
235
236 res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
237 nfs_wait_bit_killable, TASK_KILLABLE);
238 return res;
239}
240
241static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
242{
243 int res = 0;
244
245 might_sleep();
246
247 if (*timeout <= 0)
248 *timeout = NFS4_POLL_RETRY_MIN;
249 if (*timeout > NFS4_POLL_RETRY_MAX)
250 *timeout = NFS4_POLL_RETRY_MAX;
251 freezable_schedule_timeout_killable(*timeout);
252 if (fatal_signal_pending(current))
253 res = -ERESTARTSYS;
254 *timeout <<= 1;
255 return res;
256}
257
258/* This is the error handling routine for processes that are allowed
259 * to sleep.
260 */
261static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
262{
263 struct nfs_client *clp = server->nfs_client;
264 struct nfs4_state *state = exception->state;
265 struct inode *inode = exception->inode;
266 int ret = errorcode;
267
268 exception->retry = 0;
269 switch(errorcode) {
270 case 0:
271 return 0;
272 case -NFS4ERR_OPENMODE:
273 if (inode && nfs_have_delegation(inode, FMODE_READ)) {
274 nfs_inode_return_delegation(inode);
275 exception->retry = 1;
276 return 0;
277 }
278 if (state == NULL)
279 break;
280 nfs4_schedule_stateid_recovery(server, state);
281 goto wait_on_recovery;
282 case -NFS4ERR_DELEG_REVOKED:
283 case -NFS4ERR_ADMIN_REVOKED:
284 case -NFS4ERR_BAD_STATEID:
285 if (state == NULL)
286 break;
287 nfs_remove_bad_delegation(state->inode);
288 nfs4_schedule_stateid_recovery(server, state);
289 goto wait_on_recovery;
290 case -NFS4ERR_EXPIRED:
291 if (state != NULL)
292 nfs4_schedule_stateid_recovery(server, state);
293 case -NFS4ERR_STALE_STATEID:
294 case -NFS4ERR_STALE_CLIENTID:
295 nfs4_schedule_lease_recovery(clp);
296 goto wait_on_recovery;
297#if defined(CONFIG_NFS_V4_1)
298 case -NFS4ERR_BADSESSION:
299 case -NFS4ERR_BADSLOT:
300 case -NFS4ERR_BAD_HIGH_SLOT:
301 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
302 case -NFS4ERR_DEADSESSION:
303 case -NFS4ERR_SEQ_FALSE_RETRY:
304 case -NFS4ERR_SEQ_MISORDERED:
305 dprintk("%s ERROR: %d Reset session\n", __func__,
306 errorcode);
307 nfs4_schedule_session_recovery(clp->cl_session);
308 exception->retry = 1;
309 break;
310#endif /* defined(CONFIG_NFS_V4_1) */
311 case -NFS4ERR_FILE_OPEN:
312 if (exception->timeout > HZ) {
313 /* We have retried a decent amount, time to
314 * fail
315 */
316 ret = -EBUSY;
317 break;
318 }
319 case -NFS4ERR_GRACE:
320 case -NFS4ERR_DELAY:
321 case -EKEYEXPIRED:
322 ret = nfs4_delay(server->client, &exception->timeout);
323 if (ret != 0)
324 break;
325 case -NFS4ERR_RETRY_UNCACHED_REP:
326 case -NFS4ERR_OLD_STATEID:
327 exception->retry = 1;
328 break;
329 case -NFS4ERR_BADOWNER:
330 /* The following works around a Linux server bug! */
331 case -NFS4ERR_BADNAME:
332 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
333 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
334 exception->retry = 1;
335 printk(KERN_WARNING "NFS: v4 server %s "
336 "does not accept raw "
337 "uid/gids. "
338 "Reenabling the idmapper.\n",
339 server->nfs_client->cl_hostname);
340 }
341 }
342 /* We failed to handle the error */
343 return nfs4_map_errors(ret);
344wait_on_recovery:
345 ret = nfs4_wait_clnt_recover(clp);
346 if (ret == 0)
347 exception->retry = 1;
348 return ret;
349}
350
351
352static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
353{
354 spin_lock(&clp->cl_lock);
355 if (time_before(clp->cl_last_renewal,timestamp))
356 clp->cl_last_renewal = timestamp;
357 spin_unlock(&clp->cl_lock);
358}
359
360static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
361{
362 do_renew_lease(server->nfs_client, timestamp);
363}
364
365#if defined(CONFIG_NFS_V4_1)
366
367/*
368 * nfs4_free_slot - free a slot and efficiently update slot table.
369 *
370 * freeing a slot is trivially done by clearing its respective bit
371 * in the bitmap.
372 * If the freed slotid equals highest_used_slotid we want to update it
373 * so that the server would be able to size down the slot table if needed,
374 * otherwise we know that the highest_used_slotid is still in use.
375 * When updating highest_used_slotid there may be "holes" in the bitmap
376 * so we need to scan down from highest_used_slotid to 0 looking for the now
377 * highest slotid in use.
378 * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
379 *
380 * Must be called while holding tbl->slot_tbl_lock
381 */
382static void
383nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
384{
385 BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
386 /* clear used bit in bitmap */
387 __clear_bit(slotid, tbl->used_slots);
388
389 /* update highest_used_slotid when it is freed */
390 if (slotid == tbl->highest_used_slotid) {
391 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
392 if (slotid < tbl->max_slots)
393 tbl->highest_used_slotid = slotid;
394 else
395 tbl->highest_used_slotid = NFS4_NO_SLOT;
396 }
397 dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
398 slotid, tbl->highest_used_slotid);
399}
400
401bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
402{
403 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
404 return true;
405}
406
407/*
408 * Signal state manager thread if session fore channel is drained
409 */
410static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
411{
412 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
413 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
414 nfs4_set_task_privileged, NULL);
415 return;
416 }
417
418 if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
419 return;
420
421 dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
422 complete(&ses->fc_slot_table.complete);
423}
424
425/*
426 * Signal state manager thread if session back channel is drained
427 */
428void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
429{
430 if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
431 ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
432 return;
433 dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
434 complete(&ses->bc_slot_table.complete);
435}
436
437static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
438{
439 struct nfs4_slot_table *tbl;
440
441 tbl = &res->sr_session->fc_slot_table;
442 if (!res->sr_slot) {
443 /* just wake up the next guy waiting since
444 * we may have not consumed a slot after all */
445 dprintk("%s: No slot\n", __func__);
446 return;
447 }
448
449 spin_lock(&tbl->slot_tbl_lock);
450 nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
451 nfs4_check_drain_fc_complete(res->sr_session);
452 spin_unlock(&tbl->slot_tbl_lock);
453 res->sr_slot = NULL;
454}
455
456static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
457{
458 unsigned long timestamp;
459 struct nfs_client *clp;
460
461 /*
462 * sr_status remains 1 if an RPC level error occurred. The server
463 * may or may not have processed the sequence operation..
464 * Proceed as if the server received and processed the sequence
465 * operation.
466 */
467 if (res->sr_status == 1)
468 res->sr_status = NFS_OK;
469
470 /* don't increment the sequence number if the task wasn't sent */
471 if (!RPC_WAS_SENT(task))
472 goto out;
473
474 /* Check the SEQUENCE operation status */
475 switch (res->sr_status) {
476 case 0:
477 /* Update the slot's sequence and clientid lease timer */
478 ++res->sr_slot->seq_nr;
479 timestamp = res->sr_renewal_time;
480 clp = res->sr_session->clp;
481 do_renew_lease(clp, timestamp);
482 /* Check sequence flags */
483 if (res->sr_status_flags != 0)
484 nfs4_schedule_lease_recovery(clp);
485 break;
486 case -NFS4ERR_DELAY:
487 /* The server detected a resend of the RPC call and
488 * returned NFS4ERR_DELAY as per Section 2.10.6.2
489 * of RFC5661.
490 */
491 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
492 __func__,
493 res->sr_slot - res->sr_session->fc_slot_table.slots,
494 res->sr_slot->seq_nr);
495 goto out_retry;
496 default:
497 /* Just update the slot sequence no. */
498 ++res->sr_slot->seq_nr;
499 }
500out:
501 /* The session may be reset by one of the error handlers. */
502 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
503 nfs41_sequence_free_slot(res);
504 return 1;
505out_retry:
506 if (!rpc_restart_call(task))
507 goto out;
508 rpc_delay(task, NFS4_POLL_RETRY_MAX);
509 return 0;
510}
511
512static int nfs4_sequence_done(struct rpc_task *task,
513 struct nfs4_sequence_res *res)
514{
515 if (res->sr_session == NULL)
516 return 1;
517 return nfs41_sequence_done(task, res);
518}
519
520/*
521 * nfs4_find_slot - efficiently look for a free slot
522 *
523 * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
524 * If found, we mark the slot as used, update the highest_used_slotid,
525 * and respectively set up the sequence operation args.
526 * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
527 *
528 * Note: must be called with under the slot_tbl_lock.
529 */
530static u32
531nfs4_find_slot(struct nfs4_slot_table *tbl)
532{
533 u32 slotid;
534 u32 ret_id = NFS4_NO_SLOT;
535
536 dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
537 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
538 tbl->max_slots);
539 slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
540 if (slotid >= tbl->max_slots)
541 goto out;
542 __set_bit(slotid, tbl->used_slots);
543 if (slotid > tbl->highest_used_slotid ||
544 tbl->highest_used_slotid == NFS4_NO_SLOT)
545 tbl->highest_used_slotid = slotid;
546 ret_id = slotid;
547out:
548 dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
549 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
550 return ret_id;
551}
552
553static void nfs41_init_sequence(struct nfs4_sequence_args *args,
554 struct nfs4_sequence_res *res, int cache_reply)
555{
556 args->sa_session = NULL;
557 args->sa_cache_this = 0;
558 if (cache_reply)
559 args->sa_cache_this = 1;
560 res->sr_session = NULL;
561 res->sr_slot = NULL;
562}
563
564int nfs41_setup_sequence(struct nfs4_session *session,
565 struct nfs4_sequence_args *args,
566 struct nfs4_sequence_res *res,
567 struct rpc_task *task)
568{
569 struct nfs4_slot *slot;
570 struct nfs4_slot_table *tbl;
571 u32 slotid;
572
573 dprintk("--> %s\n", __func__);
574 /* slot already allocated? */
575 if (res->sr_slot != NULL)
576 return 0;
577
578 tbl = &session->fc_slot_table;
579
580 spin_lock(&tbl->slot_tbl_lock);
581 if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
582 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
583 /* The state manager will wait until the slot table is empty */
584 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
585 spin_unlock(&tbl->slot_tbl_lock);
586 dprintk("%s session is draining\n", __func__);
587 return -EAGAIN;
588 }
589
590 if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
591 !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
592 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
593 spin_unlock(&tbl->slot_tbl_lock);
594 dprintk("%s enforce FIFO order\n", __func__);
595 return -EAGAIN;
596 }
597
598 slotid = nfs4_find_slot(tbl);
599 if (slotid == NFS4_NO_SLOT) {
600 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
601 spin_unlock(&tbl->slot_tbl_lock);
602 dprintk("<-- %s: no free slots\n", __func__);
603 return -EAGAIN;
604 }
605 spin_unlock(&tbl->slot_tbl_lock);
606
607 rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
608 slot = tbl->slots + slotid;
609 args->sa_session = session;
610 args->sa_slotid = slotid;
611
612 dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
613
614 res->sr_session = session;
615 res->sr_slot = slot;
616 res->sr_renewal_time = jiffies;
617 res->sr_status_flags = 0;
618 /*
619 * sr_status is only set in decode_sequence, and so will remain
620 * set to 1 if an rpc level failure occurs.
621 */
622 res->sr_status = 1;
623 return 0;
624}
625EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
626
627int nfs4_setup_sequence(const struct nfs_server *server,
628 struct nfs4_sequence_args *args,
629 struct nfs4_sequence_res *res,
630 struct rpc_task *task)
631{
632 struct nfs4_session *session = nfs4_get_session(server);
633 int ret = 0;
634
635 if (session == NULL)
636 goto out;
637
638 dprintk("--> %s clp %p session %p sr_slot %td\n",
639 __func__, session->clp, session, res->sr_slot ?
640 res->sr_slot - session->fc_slot_table.slots : -1);
641
642 ret = nfs41_setup_sequence(session, args, res, task);
643out:
644 dprintk("<-- %s status=%d\n", __func__, ret);
645 return ret;
646}
647
648struct nfs41_call_sync_data {
649 const struct nfs_server *seq_server;
650 struct nfs4_sequence_args *seq_args;
651 struct nfs4_sequence_res *seq_res;
652};
653
654static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
655{
656 struct nfs41_call_sync_data *data = calldata;
657
658 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
659
660 if (nfs4_setup_sequence(data->seq_server, data->seq_args,
661 data->seq_res, task))
662 return;
663 rpc_call_start(task);
664}
665
666static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
667{
668 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
669 nfs41_call_sync_prepare(task, calldata);
670}
671
672static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
673{
674 struct nfs41_call_sync_data *data = calldata;
675
676 nfs41_sequence_done(task, data->seq_res);
677}
678
679static const struct rpc_call_ops nfs41_call_sync_ops = {
680 .rpc_call_prepare = nfs41_call_sync_prepare,
681 .rpc_call_done = nfs41_call_sync_done,
682};
683
684static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
685 .rpc_call_prepare = nfs41_call_priv_sync_prepare,
686 .rpc_call_done = nfs41_call_sync_done,
687};
688
689static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
690 struct nfs_server *server,
691 struct rpc_message *msg,
692 struct nfs4_sequence_args *args,
693 struct nfs4_sequence_res *res,
694 int privileged)
695{
696 int ret;
697 struct rpc_task *task;
698 struct nfs41_call_sync_data data = {
699 .seq_server = server,
700 .seq_args = args,
701 .seq_res = res,
702 };
703 struct rpc_task_setup task_setup = {
704 .rpc_client = clnt,
705 .rpc_message = msg,
706 .callback_ops = &nfs41_call_sync_ops,
707 .callback_data = &data
708 };
709
710 if (privileged)
711 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
712 task = rpc_run_task(&task_setup);
713 if (IS_ERR(task))
714 ret = PTR_ERR(task);
715 else {
716 ret = task->tk_status;
717 rpc_put_task(task);
718 }
719 return ret;
720}
721
722int _nfs4_call_sync_session(struct rpc_clnt *clnt,
723 struct nfs_server *server,
724 struct rpc_message *msg,
725 struct nfs4_sequence_args *args,
726 struct nfs4_sequence_res *res,
727 int cache_reply)
728{
729 nfs41_init_sequence(args, res, cache_reply);
730 return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
731}
732
733#else
734static inline
735void nfs41_init_sequence(struct nfs4_sequence_args *args,
736 struct nfs4_sequence_res *res, int cache_reply)
737{
738}
739
740static int nfs4_sequence_done(struct rpc_task *task,
741 struct nfs4_sequence_res *res)
742{
743 return 1;
744}
745#endif /* CONFIG_NFS_V4_1 */
746
747int _nfs4_call_sync(struct rpc_clnt *clnt,
748 struct nfs_server *server,
749 struct rpc_message *msg,
750 struct nfs4_sequence_args *args,
751 struct nfs4_sequence_res *res,
752 int cache_reply)
753{
754 nfs41_init_sequence(args, res, cache_reply);
755 return rpc_call_sync(clnt, msg, 0);
756}
757
758static inline
759int nfs4_call_sync(struct rpc_clnt *clnt,
760 struct nfs_server *server,
761 struct rpc_message *msg,
762 struct nfs4_sequence_args *args,
763 struct nfs4_sequence_res *res,
764 int cache_reply)
765{
766 return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
767 args, res, cache_reply);
768}
769
770static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
771{
772 struct nfs_inode *nfsi = NFS_I(dir);
773
774 spin_lock(&dir->i_lock);
775 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
776 if (!cinfo->atomic || cinfo->before != dir->i_version)
777 nfs_force_lookup_revalidate(dir);
778 dir->i_version = cinfo->after;
779 spin_unlock(&dir->i_lock);
780}
781
782struct nfs4_opendata {
783 struct kref kref;
784 struct nfs_openargs o_arg;
785 struct nfs_openres o_res;
786 struct nfs_open_confirmargs c_arg;
787 struct nfs_open_confirmres c_res;
788 struct nfs4_string owner_name;
789 struct nfs4_string group_name;
790 struct nfs_fattr f_attr;
791 struct nfs_fattr dir_attr;
792 struct dentry *dir;
793 struct dentry *dentry;
794 struct nfs4_state_owner *owner;
795 struct nfs4_state *state;
796 struct iattr attrs;
797 unsigned long timestamp;
798 unsigned int rpc_done : 1;
799 int rpc_status;
800 int cancelled;
801};
802
803
804static void nfs4_init_opendata_res(struct nfs4_opendata *p)
805{
806 p->o_res.f_attr = &p->f_attr;
807 p->o_res.dir_attr = &p->dir_attr;
808 p->o_res.seqid = p->o_arg.seqid;
809 p->c_res.seqid = p->c_arg.seqid;
810 p->o_res.server = p->o_arg.server;
811 nfs_fattr_init(&p->f_attr);
812 nfs_fattr_init(&p->dir_attr);
813 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
814}
815
816static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
817 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
818 const struct iattr *attrs,
819 gfp_t gfp_mask)
820{
821 struct dentry *parent = dget_parent(dentry);
822 struct inode *dir = parent->d_inode;
823 struct nfs_server *server = NFS_SERVER(dir);
824 struct nfs4_opendata *p;
825
826 p = kzalloc(sizeof(*p), gfp_mask);
827 if (p == NULL)
828 goto err;
829 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
830 if (p->o_arg.seqid == NULL)
831 goto err_free;
832 nfs_sb_active(dentry->d_sb);
833 p->dentry = dget(dentry);
834 p->dir = parent;
835 p->owner = sp;
836 atomic_inc(&sp->so_count);
837 p->o_arg.fh = NFS_FH(dir);
838 p->o_arg.open_flags = flags;
839 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
840 p->o_arg.clientid = server->nfs_client->cl_clientid;
841 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
842 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
843 p->o_arg.name = &dentry->d_name;
844 p->o_arg.server = server;
845 p->o_arg.bitmask = server->attr_bitmask;
846 p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
847 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
848 if (attrs != NULL && attrs->ia_valid != 0) {
849 __be32 verf[2];
850
851 p->o_arg.u.attrs = &p->attrs;
852 memcpy(&p->attrs, attrs, sizeof(p->attrs));
853
854 verf[0] = jiffies;
855 verf[1] = current->pid;
856 memcpy(p->o_arg.u.verifier.data, verf,
857 sizeof(p->o_arg.u.verifier.data));
858 }
859 p->c_arg.fh = &p->o_res.fh;
860 p->c_arg.stateid = &p->o_res.stateid;
861 p->c_arg.seqid = p->o_arg.seqid;
862 nfs4_init_opendata_res(p);
863 kref_init(&p->kref);
864 return p;
865err_free:
866 kfree(p);
867err:
868 dput(parent);
869 return NULL;
870}
871
872static void nfs4_opendata_free(struct kref *kref)
873{
874 struct nfs4_opendata *p = container_of(kref,
875 struct nfs4_opendata, kref);
876 struct super_block *sb = p->dentry->d_sb;
877
878 nfs_free_seqid(p->o_arg.seqid);
879 if (p->state != NULL)
880 nfs4_put_open_state(p->state);
881 nfs4_put_state_owner(p->owner);
882 dput(p->dir);
883 dput(p->dentry);
884 nfs_sb_deactive(sb);
885 nfs_fattr_free_names(&p->f_attr);
886 kfree(p);
887}
888
889static void nfs4_opendata_put(struct nfs4_opendata *p)
890{
891 if (p != NULL)
892 kref_put(&p->kref, nfs4_opendata_free);
893}
894
895static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
896{
897 int ret;
898
899 ret = rpc_wait_for_completion_task(task);
900 return ret;
901}
902
903static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
904{
905 int ret = 0;
906
907 if (open_mode & (O_EXCL|O_TRUNC))
908 goto out;
909 switch (mode & (FMODE_READ|FMODE_WRITE)) {
910 case FMODE_READ:
911 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
912 && state->n_rdonly != 0;
913 break;
914 case FMODE_WRITE:
915 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
916 && state->n_wronly != 0;
917 break;
918 case FMODE_READ|FMODE_WRITE:
919 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
920 && state->n_rdwr != 0;
921 }
922out:
923 return ret;
924}
925
926static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
927{
928 if (delegation == NULL)
929 return 0;
930 if ((delegation->type & fmode) != fmode)
931 return 0;
932 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
933 return 0;
934 nfs_mark_delegation_referenced(delegation);
935 return 1;
936}
937
938static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
939{
940 switch (fmode) {
941 case FMODE_WRITE:
942 state->n_wronly++;
943 break;
944 case FMODE_READ:
945 state->n_rdonly++;
946 break;
947 case FMODE_READ|FMODE_WRITE:
948 state->n_rdwr++;
949 }
950 nfs4_state_set_mode_locked(state, state->state | fmode);
951}
952
953static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
954{
955 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
956 nfs4_stateid_copy(&state->stateid, stateid);
957 nfs4_stateid_copy(&state->open_stateid, stateid);
958 switch (fmode) {
959 case FMODE_READ:
960 set_bit(NFS_O_RDONLY_STATE, &state->flags);
961 break;
962 case FMODE_WRITE:
963 set_bit(NFS_O_WRONLY_STATE, &state->flags);
964 break;
965 case FMODE_READ|FMODE_WRITE:
966 set_bit(NFS_O_RDWR_STATE, &state->flags);
967 }
968}
969
970static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
971{
972 write_seqlock(&state->seqlock);
973 nfs_set_open_stateid_locked(state, stateid, fmode);
974 write_sequnlock(&state->seqlock);
975}
976
977static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
978{
979 /*
980 * Protect the call to nfs4_state_set_mode_locked and
981 * serialise the stateid update
982 */
983 write_seqlock(&state->seqlock);
984 if (deleg_stateid != NULL) {
985 nfs4_stateid_copy(&state->stateid, deleg_stateid);
986 set_bit(NFS_DELEGATED_STATE, &state->flags);
987 }
988 if (open_stateid != NULL)
989 nfs_set_open_stateid_locked(state, open_stateid, fmode);
990 write_sequnlock(&state->seqlock);
991 spin_lock(&state->owner->so_lock);
992 update_open_stateflags(state, fmode);
993 spin_unlock(&state->owner->so_lock);
994}
995
996static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
997{
998 struct nfs_inode *nfsi = NFS_I(state->inode);
999 struct nfs_delegation *deleg_cur;
1000 int ret = 0;
1001
1002 fmode &= (FMODE_READ|FMODE_WRITE);
1003
1004 rcu_read_lock();
1005 deleg_cur = rcu_dereference(nfsi->delegation);
1006 if (deleg_cur == NULL)
1007 goto no_delegation;
1008
1009 spin_lock(&deleg_cur->lock);
1010 if (nfsi->delegation != deleg_cur ||
1011 (deleg_cur->type & fmode) != fmode)
1012 goto no_delegation_unlock;
1013
1014 if (delegation == NULL)
1015 delegation = &deleg_cur->stateid;
1016 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1017 goto no_delegation_unlock;
1018
1019 nfs_mark_delegation_referenced(deleg_cur);
1020 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1021 ret = 1;
1022no_delegation_unlock:
1023 spin_unlock(&deleg_cur->lock);
1024no_delegation:
1025 rcu_read_unlock();
1026
1027 if (!ret && open_stateid != NULL) {
1028 __update_open_stateid(state, open_stateid, NULL, fmode);
1029 ret = 1;
1030 }
1031
1032 return ret;
1033}
1034
1035
1036static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1037{
1038 struct nfs_delegation *delegation;
1039
1040 rcu_read_lock();
1041 delegation = rcu_dereference(NFS_I(inode)->delegation);
1042 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1043 rcu_read_unlock();
1044 return;
1045 }
1046 rcu_read_unlock();
1047 nfs_inode_return_delegation(inode);
1048}
1049
1050static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1051{
1052 struct nfs4_state *state = opendata->state;
1053 struct nfs_inode *nfsi = NFS_I(state->inode);
1054 struct nfs_delegation *delegation;
1055 int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1056 fmode_t fmode = opendata->o_arg.fmode;
1057 nfs4_stateid stateid;
1058 int ret = -EAGAIN;
1059
1060 for (;;) {
1061 if (can_open_cached(state, fmode, open_mode)) {
1062 spin_lock(&state->owner->so_lock);
1063 if (can_open_cached(state, fmode, open_mode)) {
1064 update_open_stateflags(state, fmode);
1065 spin_unlock(&state->owner->so_lock);
1066 goto out_return_state;
1067 }
1068 spin_unlock(&state->owner->so_lock);
1069 }
1070 rcu_read_lock();
1071 delegation = rcu_dereference(nfsi->delegation);
1072 if (!can_open_delegated(delegation, fmode)) {
1073 rcu_read_unlock();
1074 break;
1075 }
1076 /* Save the delegation */
1077 nfs4_stateid_copy(&stateid, &delegation->stateid);
1078 rcu_read_unlock();
1079 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1080 if (ret != 0)
1081 goto out;
1082 ret = -EAGAIN;
1083
1084 /* Try to update the stateid using the delegation */
1085 if (update_open_stateid(state, NULL, &stateid, fmode))
1086 goto out_return_state;
1087 }
1088out:
1089 return ERR_PTR(ret);
1090out_return_state:
1091 atomic_inc(&state->count);
1092 return state;
1093}
1094
1095static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1096{
1097 struct inode *inode;
1098 struct nfs4_state *state = NULL;
1099 struct nfs_delegation *delegation;
1100 int ret;
1101
1102 if (!data->rpc_done) {
1103 state = nfs4_try_open_cached(data);
1104 goto out;
1105 }
1106
1107 ret = -EAGAIN;
1108 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1109 goto err;
1110 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1111 ret = PTR_ERR(inode);
1112 if (IS_ERR(inode))
1113 goto err;
1114 ret = -ENOMEM;
1115 state = nfs4_get_open_state(inode, data->owner);
1116 if (state == NULL)
1117 goto err_put_inode;
1118 if (data->o_res.delegation_type != 0) {
1119 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1120 int delegation_flags = 0;
1121
1122 rcu_read_lock();
1123 delegation = rcu_dereference(NFS_I(inode)->delegation);
1124 if (delegation)
1125 delegation_flags = delegation->flags;
1126 rcu_read_unlock();
1127 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1128 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1129 "returning a delegation for "
1130 "OPEN(CLAIM_DELEGATE_CUR)\n",
1131 clp->cl_hostname);
1132 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1133 nfs_inode_set_delegation(state->inode,
1134 data->owner->so_cred,
1135 &data->o_res);
1136 else
1137 nfs_inode_reclaim_delegation(state->inode,
1138 data->owner->so_cred,
1139 &data->o_res);
1140 }
1141
1142 update_open_stateid(state, &data->o_res.stateid, NULL,
1143 data->o_arg.fmode);
1144 iput(inode);
1145out:
1146 return state;
1147err_put_inode:
1148 iput(inode);
1149err:
1150 return ERR_PTR(ret);
1151}
1152
1153static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1154{
1155 struct nfs_inode *nfsi = NFS_I(state->inode);
1156 struct nfs_open_context *ctx;
1157
1158 spin_lock(&state->inode->i_lock);
1159 list_for_each_entry(ctx, &nfsi->open_files, list) {
1160 if (ctx->state != state)
1161 continue;
1162 get_nfs_open_context(ctx);
1163 spin_unlock(&state->inode->i_lock);
1164 return ctx;
1165 }
1166 spin_unlock(&state->inode->i_lock);
1167 return ERR_PTR(-ENOENT);
1168}
1169
1170static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1171{
1172 struct nfs4_opendata *opendata;
1173
1174 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1175 if (opendata == NULL)
1176 return ERR_PTR(-ENOMEM);
1177 opendata->state = state;
1178 atomic_inc(&state->count);
1179 return opendata;
1180}
1181
1182static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1183{
1184 struct nfs4_state *newstate;
1185 int ret;
1186
1187 opendata->o_arg.open_flags = 0;
1188 opendata->o_arg.fmode = fmode;
1189 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1190 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1191 nfs4_init_opendata_res(opendata);
1192 ret = _nfs4_recover_proc_open(opendata);
1193 if (ret != 0)
1194 return ret;
1195 newstate = nfs4_opendata_to_nfs4_state(opendata);
1196 if (IS_ERR(newstate))
1197 return PTR_ERR(newstate);
1198 nfs4_close_state(newstate, fmode);
1199 *res = newstate;
1200 return 0;
1201}
1202
1203static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1204{
1205 struct nfs4_state *newstate;
1206 int ret;
1207
1208 /* memory barrier prior to reading state->n_* */
1209 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1210 smp_rmb();
1211 if (state->n_rdwr != 0) {
1212 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1213 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1214 if (ret != 0)
1215 return ret;
1216 if (newstate != state)
1217 return -ESTALE;
1218 }
1219 if (state->n_wronly != 0) {
1220 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1221 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1222 if (ret != 0)
1223 return ret;
1224 if (newstate != state)
1225 return -ESTALE;
1226 }
1227 if (state->n_rdonly != 0) {
1228 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1229 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1230 if (ret != 0)
1231 return ret;
1232 if (newstate != state)
1233 return -ESTALE;
1234 }
1235 /*
1236 * We may have performed cached opens for all three recoveries.
1237 * Check if we need to update the current stateid.
1238 */
1239 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1240 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1241 write_seqlock(&state->seqlock);
1242 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1243 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1244 write_sequnlock(&state->seqlock);
1245 }
1246 return 0;
1247}
1248
1249/*
1250 * OPEN_RECLAIM:
1251 * reclaim state on the server after a reboot.
1252 */
1253static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1254{
1255 struct nfs_delegation *delegation;
1256 struct nfs4_opendata *opendata;
1257 fmode_t delegation_type = 0;
1258 int status;
1259
1260 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1261 if (IS_ERR(opendata))
1262 return PTR_ERR(opendata);
1263 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1264 opendata->o_arg.fh = NFS_FH(state->inode);
1265 rcu_read_lock();
1266 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1267 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1268 delegation_type = delegation->type;
1269 rcu_read_unlock();
1270 opendata->o_arg.u.delegation_type = delegation_type;
1271 status = nfs4_open_recover(opendata, state);
1272 nfs4_opendata_put(opendata);
1273 return status;
1274}
1275
1276static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1277{
1278 struct nfs_server *server = NFS_SERVER(state->inode);
1279 struct nfs4_exception exception = { };
1280 int err;
1281 do {
1282 err = _nfs4_do_open_reclaim(ctx, state);
1283 if (err != -NFS4ERR_DELAY)
1284 break;
1285 nfs4_handle_exception(server, err, &exception);
1286 } while (exception.retry);
1287 return err;
1288}
1289
1290static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1291{
1292 struct nfs_open_context *ctx;
1293 int ret;
1294
1295 ctx = nfs4_state_find_open_context(state);
1296 if (IS_ERR(ctx))
1297 return PTR_ERR(ctx);
1298 ret = nfs4_do_open_reclaim(ctx, state);
1299 put_nfs_open_context(ctx);
1300 return ret;
1301}
1302
1303static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1304{
1305 struct nfs4_opendata *opendata;
1306 int ret;
1307
1308 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1309 if (IS_ERR(opendata))
1310 return PTR_ERR(opendata);
1311 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1312 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1313 ret = nfs4_open_recover(opendata, state);
1314 nfs4_opendata_put(opendata);
1315 return ret;
1316}
1317
1318int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1319{
1320 struct nfs4_exception exception = { };
1321 struct nfs_server *server = NFS_SERVER(state->inode);
1322 int err;
1323 do {
1324 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1325 switch (err) {
1326 case 0:
1327 case -ENOENT:
1328 case -ESTALE:
1329 goto out;
1330 case -NFS4ERR_BADSESSION:
1331 case -NFS4ERR_BADSLOT:
1332 case -NFS4ERR_BAD_HIGH_SLOT:
1333 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1334 case -NFS4ERR_DEADSESSION:
1335 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1336 goto out;
1337 case -NFS4ERR_STALE_CLIENTID:
1338 case -NFS4ERR_STALE_STATEID:
1339 case -NFS4ERR_EXPIRED:
1340 /* Don't recall a delegation if it was lost */
1341 nfs4_schedule_lease_recovery(server->nfs_client);
1342 goto out;
1343 case -ERESTARTSYS:
1344 /*
1345 * The show must go on: exit, but mark the
1346 * stateid as needing recovery.
1347 */
1348 case -NFS4ERR_DELEG_REVOKED:
1349 case -NFS4ERR_ADMIN_REVOKED:
1350 case -NFS4ERR_BAD_STATEID:
1351 nfs_inode_find_state_and_recover(state->inode,
1352 stateid);
1353 nfs4_schedule_stateid_recovery(server, state);
1354 case -EKEYEXPIRED:
1355 /*
1356 * User RPCSEC_GSS context has expired.
1357 * We cannot recover this stateid now, so
1358 * skip it and allow recovery thread to
1359 * proceed.
1360 */
1361 case -ENOMEM:
1362 err = 0;
1363 goto out;
1364 }
1365 err = nfs4_handle_exception(server, err, &exception);
1366 } while (exception.retry);
1367out:
1368 return err;
1369}
1370
1371static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1372{
1373 struct nfs4_opendata *data = calldata;
1374
1375 data->rpc_status = task->tk_status;
1376 if (data->rpc_status == 0) {
1377 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1378 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1379 renew_lease(data->o_res.server, data->timestamp);
1380 data->rpc_done = 1;
1381 }
1382}
1383
1384static void nfs4_open_confirm_release(void *calldata)
1385{
1386 struct nfs4_opendata *data = calldata;
1387 struct nfs4_state *state = NULL;
1388
1389 /* If this request hasn't been cancelled, do nothing */
1390 if (data->cancelled == 0)
1391 goto out_free;
1392 /* In case of error, no cleanup! */
1393 if (!data->rpc_done)
1394 goto out_free;
1395 state = nfs4_opendata_to_nfs4_state(data);
1396 if (!IS_ERR(state))
1397 nfs4_close_state(state, data->o_arg.fmode);
1398out_free:
1399 nfs4_opendata_put(data);
1400}
1401
1402static const struct rpc_call_ops nfs4_open_confirm_ops = {
1403 .rpc_call_done = nfs4_open_confirm_done,
1404 .rpc_release = nfs4_open_confirm_release,
1405};
1406
1407/*
1408 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1409 */
1410static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1411{
1412 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1413 struct rpc_task *task;
1414 struct rpc_message msg = {
1415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1416 .rpc_argp = &data->c_arg,
1417 .rpc_resp = &data->c_res,
1418 .rpc_cred = data->owner->so_cred,
1419 };
1420 struct rpc_task_setup task_setup_data = {
1421 .rpc_client = server->client,
1422 .rpc_message = &msg,
1423 .callback_ops = &nfs4_open_confirm_ops,
1424 .callback_data = data,
1425 .workqueue = nfsiod_workqueue,
1426 .flags = RPC_TASK_ASYNC,
1427 };
1428 int status;
1429
1430 kref_get(&data->kref);
1431 data->rpc_done = 0;
1432 data->rpc_status = 0;
1433 data->timestamp = jiffies;
1434 task = rpc_run_task(&task_setup_data);
1435 if (IS_ERR(task))
1436 return PTR_ERR(task);
1437 status = nfs4_wait_for_completion_rpc_task(task);
1438 if (status != 0) {
1439 data->cancelled = 1;
1440 smp_wmb();
1441 } else
1442 status = data->rpc_status;
1443 rpc_put_task(task);
1444 return status;
1445}
1446
1447static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1448{
1449 struct nfs4_opendata *data = calldata;
1450 struct nfs4_state_owner *sp = data->owner;
1451
1452 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1453 return;
1454 /*
1455 * Check if we still need to send an OPEN call, or if we can use
1456 * a delegation instead.
1457 */
1458 if (data->state != NULL) {
1459 struct nfs_delegation *delegation;
1460
1461 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1462 goto out_no_action;
1463 rcu_read_lock();
1464 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1465 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1466 can_open_delegated(delegation, data->o_arg.fmode))
1467 goto unlock_no_action;
1468 rcu_read_unlock();
1469 }
1470 /* Update client id. */
1471 data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1472 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1473 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1474 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1475 }
1476 data->timestamp = jiffies;
1477 if (nfs4_setup_sequence(data->o_arg.server,
1478 &data->o_arg.seq_args,
1479 &data->o_res.seq_res, task))
1480 return;
1481 rpc_call_start(task);
1482 return;
1483unlock_no_action:
1484 rcu_read_unlock();
1485out_no_action:
1486 task->tk_action = NULL;
1487
1488}
1489
1490static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1491{
1492 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1493 nfs4_open_prepare(task, calldata);
1494}
1495
1496static void nfs4_open_done(struct rpc_task *task, void *calldata)
1497{
1498 struct nfs4_opendata *data = calldata;
1499
1500 data->rpc_status = task->tk_status;
1501
1502 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1503 return;
1504
1505 if (task->tk_status == 0) {
1506 switch (data->o_res.f_attr->mode & S_IFMT) {
1507 case S_IFREG:
1508 break;
1509 case S_IFLNK:
1510 data->rpc_status = -ELOOP;
1511 break;
1512 case S_IFDIR:
1513 data->rpc_status = -EISDIR;
1514 break;
1515 default:
1516 data->rpc_status = -ENOTDIR;
1517 }
1518 renew_lease(data->o_res.server, data->timestamp);
1519 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1520 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1521 }
1522 data->rpc_done = 1;
1523}
1524
1525static void nfs4_open_release(void *calldata)
1526{
1527 struct nfs4_opendata *data = calldata;
1528 struct nfs4_state *state = NULL;
1529
1530 /* If this request hasn't been cancelled, do nothing */
1531 if (data->cancelled == 0)
1532 goto out_free;
1533 /* In case of error, no cleanup! */
1534 if (data->rpc_status != 0 || !data->rpc_done)
1535 goto out_free;
1536 /* In case we need an open_confirm, no cleanup! */
1537 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1538 goto out_free;
1539 state = nfs4_opendata_to_nfs4_state(data);
1540 if (!IS_ERR(state))
1541 nfs4_close_state(state, data->o_arg.fmode);
1542out_free:
1543 nfs4_opendata_put(data);
1544}
1545
1546static const struct rpc_call_ops nfs4_open_ops = {
1547 .rpc_call_prepare = nfs4_open_prepare,
1548 .rpc_call_done = nfs4_open_done,
1549 .rpc_release = nfs4_open_release,
1550};
1551
1552static const struct rpc_call_ops nfs4_recover_open_ops = {
1553 .rpc_call_prepare = nfs4_recover_open_prepare,
1554 .rpc_call_done = nfs4_open_done,
1555 .rpc_release = nfs4_open_release,
1556};
1557
1558static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1559{
1560 struct inode *dir = data->dir->d_inode;
1561 struct nfs_server *server = NFS_SERVER(dir);
1562 struct nfs_openargs *o_arg = &data->o_arg;
1563 struct nfs_openres *o_res = &data->o_res;
1564 struct rpc_task *task;
1565 struct rpc_message msg = {
1566 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1567 .rpc_argp = o_arg,
1568 .rpc_resp = o_res,
1569 .rpc_cred = data->owner->so_cred,
1570 };
1571 struct rpc_task_setup task_setup_data = {
1572 .rpc_client = server->client,
1573 .rpc_message = &msg,
1574 .callback_ops = &nfs4_open_ops,
1575 .callback_data = data,
1576 .workqueue = nfsiod_workqueue,
1577 .flags = RPC_TASK_ASYNC,
1578 };
1579 int status;
1580
1581 nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1582 kref_get(&data->kref);
1583 data->rpc_done = 0;
1584 data->rpc_status = 0;
1585 data->cancelled = 0;
1586 if (isrecover)
1587 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1588 task = rpc_run_task(&task_setup_data);
1589 if (IS_ERR(task))
1590 return PTR_ERR(task);
1591 status = nfs4_wait_for_completion_rpc_task(task);
1592 if (status != 0) {
1593 data->cancelled = 1;
1594 smp_wmb();
1595 } else
1596 status = data->rpc_status;
1597 rpc_put_task(task);
1598
1599 return status;
1600}
1601
1602static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1603{
1604 struct inode *dir = data->dir->d_inode;
1605 struct nfs_openres *o_res = &data->o_res;
1606 int status;
1607
1608 status = nfs4_run_open_task(data, 1);
1609 if (status != 0 || !data->rpc_done)
1610 return status;
1611
1612 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1613
1614 nfs_refresh_inode(dir, o_res->dir_attr);
1615
1616 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1617 status = _nfs4_proc_open_confirm(data);
1618 if (status != 0)
1619 return status;
1620 }
1621
1622 return status;
1623}
1624
1625/*
1626 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1627 */
1628static int _nfs4_proc_open(struct nfs4_opendata *data)
1629{
1630 struct inode *dir = data->dir->d_inode;
1631 struct nfs_server *server = NFS_SERVER(dir);
1632 struct nfs_openargs *o_arg = &data->o_arg;
1633 struct nfs_openres *o_res = &data->o_res;
1634 int status;
1635
1636 status = nfs4_run_open_task(data, 0);
1637 if (!data->rpc_done)
1638 return status;
1639 if (status != 0) {
1640 if (status == -NFS4ERR_BADNAME &&
1641 !(o_arg->open_flags & O_CREAT))
1642 return -ENOENT;
1643 return status;
1644 }
1645
1646 nfs_fattr_map_and_free_names(server, &data->f_attr);
1647
1648 if (o_arg->open_flags & O_CREAT) {
1649 update_changeattr(dir, &o_res->cinfo);
1650 nfs_post_op_update_inode(dir, o_res->dir_attr);
1651 } else
1652 nfs_refresh_inode(dir, o_res->dir_attr);
1653 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1654 server->caps &= ~NFS_CAP_POSIX_LOCK;
1655 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1656 status = _nfs4_proc_open_confirm(data);
1657 if (status != 0)
1658 return status;
1659 }
1660 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1661 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1662 return 0;
1663}
1664
1665static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1666{
1667 unsigned int loop;
1668 int ret;
1669
1670 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1671 ret = nfs4_wait_clnt_recover(clp);
1672 if (ret != 0)
1673 break;
1674 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1675 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1676 break;
1677 nfs4_schedule_state_manager(clp);
1678 ret = -EIO;
1679 }
1680 return ret;
1681}
1682
1683static int nfs4_recover_expired_lease(struct nfs_server *server)
1684{
1685 return nfs4_client_recover_expired_lease(server->nfs_client);
1686}
1687
1688/*
1689 * OPEN_EXPIRED:
1690 * reclaim state on the server after a network partition.
1691 * Assumes caller holds the appropriate lock
1692 */
1693static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1694{
1695 struct nfs4_opendata *opendata;
1696 int ret;
1697
1698 opendata = nfs4_open_recoverdata_alloc(ctx, state);
1699 if (IS_ERR(opendata))
1700 return PTR_ERR(opendata);
1701 ret = nfs4_open_recover(opendata, state);
1702 if (ret == -ESTALE)
1703 d_drop(ctx->dentry);
1704 nfs4_opendata_put(opendata);
1705 return ret;
1706}
1707
1708static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1709{
1710 struct nfs_server *server = NFS_SERVER(state->inode);
1711 struct nfs4_exception exception = { };
1712 int err;
1713
1714 do {
1715 err = _nfs4_open_expired(ctx, state);
1716 switch (err) {
1717 default:
1718 goto out;
1719 case -NFS4ERR_GRACE:
1720 case -NFS4ERR_DELAY:
1721 nfs4_handle_exception(server, err, &exception);
1722 err = 0;
1723 }
1724 } while (exception.retry);
1725out:
1726 return err;
1727}
1728
1729static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1730{
1731 struct nfs_open_context *ctx;
1732 int ret;
1733
1734 ctx = nfs4_state_find_open_context(state);
1735 if (IS_ERR(ctx))
1736 return PTR_ERR(ctx);
1737 ret = nfs4_do_open_expired(ctx, state);
1738 put_nfs_open_context(ctx);
1739 return ret;
1740}
1741
1742#if defined(CONFIG_NFS_V4_1)
1743static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1744{
1745 int status = NFS_OK;
1746 struct nfs_server *server = NFS_SERVER(state->inode);
1747
1748 if (state->flags & flags) {
1749 status = nfs41_test_stateid(server, stateid);
1750 if (status != NFS_OK) {
1751 nfs41_free_stateid(server, stateid);
1752 state->flags &= ~flags;
1753 }
1754 }
1755 return status;
1756}
1757
1758static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1759{
1760 int deleg_status, open_status;
1761 int deleg_flags = 1 << NFS_DELEGATED_STATE;
1762 int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1763
1764 deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1765 open_status = nfs41_check_expired_stateid(state, &state->open_stateid, open_flags);
1766
1767 if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1768 return NFS_OK;
1769 return nfs4_open_expired(sp, state);
1770}
1771#endif
1772
1773/*
1774 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1775 * fields corresponding to attributes that were used to store the verifier.
1776 * Make sure we clobber those fields in the later setattr call
1777 */
1778static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1779{
1780 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1781 !(sattr->ia_valid & ATTR_ATIME_SET))
1782 sattr->ia_valid |= ATTR_ATIME;
1783
1784 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1785 !(sattr->ia_valid & ATTR_MTIME_SET))
1786 sattr->ia_valid |= ATTR_MTIME;
1787}
1788
1789/*
1790 * Returns a referenced nfs4_state
1791 */
1792static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1793{
1794 struct nfs4_state_owner *sp;
1795 struct nfs4_state *state = NULL;
1796 struct nfs_server *server = NFS_SERVER(dir);
1797 struct nfs4_opendata *opendata;
1798 int status;
1799
1800 /* Protect against reboot recovery conflicts */
1801 status = -ENOMEM;
1802 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1803 if (sp == NULL) {
1804 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1805 goto out_err;
1806 }
1807 status = nfs4_recover_expired_lease(server);
1808 if (status != 0)
1809 goto err_put_state_owner;
1810 if (dentry->d_inode != NULL)
1811 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1812 status = -ENOMEM;
1813 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1814 if (opendata == NULL)
1815 goto err_put_state_owner;
1816
1817 if (dentry->d_inode != NULL)
1818 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1819
1820 status = _nfs4_proc_open(opendata);
1821 if (status != 0)
1822 goto err_opendata_put;
1823
1824 state = nfs4_opendata_to_nfs4_state(opendata);
1825 status = PTR_ERR(state);
1826 if (IS_ERR(state))
1827 goto err_opendata_put;
1828 if (server->caps & NFS_CAP_POSIX_LOCK)
1829 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1830
1831 if (opendata->o_arg.open_flags & O_EXCL) {
1832 nfs4_exclusive_attrset(opendata, sattr);
1833
1834 nfs_fattr_init(opendata->o_res.f_attr);
1835 status = nfs4_do_setattr(state->inode, cred,
1836 opendata->o_res.f_attr, sattr,
1837 state);
1838 if (status == 0)
1839 nfs_setattr_update_inode(state->inode, sattr);
1840 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1841 }
1842 nfs4_opendata_put(opendata);
1843 nfs4_put_state_owner(sp);
1844 *res = state;
1845 return 0;
1846err_opendata_put:
1847 nfs4_opendata_put(opendata);
1848err_put_state_owner:
1849 nfs4_put_state_owner(sp);
1850out_err:
1851 *res = NULL;
1852 return status;
1853}
1854
1855
1856static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1857{
1858 struct nfs4_exception exception = { };
1859 struct nfs4_state *res;
1860 int status;
1861
1862 do {
1863 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1864 if (status == 0)
1865 break;
1866 /* NOTE: BAD_SEQID means the server and client disagree about the
1867 * book-keeping w.r.t. state-changing operations
1868 * (OPEN/CLOSE/LOCK/LOCKU...)
1869 * It is actually a sign of a bug on the client or on the server.
1870 *
1871 * If we receive a BAD_SEQID error in the particular case of
1872 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1873 * have unhashed the old state_owner for us, and that we can
1874 * therefore safely retry using a new one. We should still warn
1875 * the user though...
1876 */
1877 if (status == -NFS4ERR_BAD_SEQID) {
1878 pr_warn_ratelimited("NFS: v4 server %s "
1879 " returned a bad sequence-id error!\n",
1880 NFS_SERVER(dir)->nfs_client->cl_hostname);
1881 exception.retry = 1;
1882 continue;
1883 }
1884 /*
1885 * BAD_STATEID on OPEN means that the server cancelled our
1886 * state before it received the OPEN_CONFIRM.
1887 * Recover by retrying the request as per the discussion
1888 * on Page 181 of RFC3530.
1889 */
1890 if (status == -NFS4ERR_BAD_STATEID) {
1891 exception.retry = 1;
1892 continue;
1893 }
1894 if (status == -EAGAIN) {
1895 /* We must have found a delegation */
1896 exception.retry = 1;
1897 continue;
1898 }
1899 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1900 status, &exception));
1901 } while (exception.retry);
1902 return res;
1903}
1904
1905static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1906 struct nfs_fattr *fattr, struct iattr *sattr,
1907 struct nfs4_state *state)
1908{
1909 struct nfs_server *server = NFS_SERVER(inode);
1910 struct nfs_setattrargs arg = {
1911 .fh = NFS_FH(inode),
1912 .iap = sattr,
1913 .server = server,
1914 .bitmask = server->attr_bitmask,
1915 };
1916 struct nfs_setattrres res = {
1917 .fattr = fattr,
1918 .server = server,
1919 };
1920 struct rpc_message msg = {
1921 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1922 .rpc_argp = &arg,
1923 .rpc_resp = &res,
1924 .rpc_cred = cred,
1925 };
1926 unsigned long timestamp = jiffies;
1927 int status;
1928
1929 nfs_fattr_init(fattr);
1930
1931 if (state != NULL) {
1932 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1933 current->files, current->tgid);
1934 } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1935 FMODE_WRITE)) {
1936 /* Use that stateid */
1937 } else
1938 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1939
1940 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1941 if (status == 0 && state != NULL)
1942 renew_lease(server, timestamp);
1943 return status;
1944}
1945
1946static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1947 struct nfs_fattr *fattr, struct iattr *sattr,
1948 struct nfs4_state *state)
1949{
1950 struct nfs_server *server = NFS_SERVER(inode);
1951 struct nfs4_exception exception = {
1952 .state = state,
1953 .inode = inode,
1954 };
1955 int err;
1956 do {
1957 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1958 switch (err) {
1959 case -NFS4ERR_OPENMODE:
1960 if (state && !(state->state & FMODE_WRITE)) {
1961 err = -EBADF;
1962 if (sattr->ia_valid & ATTR_OPEN)
1963 err = -EACCES;
1964 goto out;
1965 }
1966 }
1967 err = nfs4_handle_exception(server, err, &exception);
1968 } while (exception.retry);
1969out:
1970 return err;
1971}
1972
1973struct nfs4_closedata {
1974 struct inode *inode;
1975 struct nfs4_state *state;
1976 struct nfs_closeargs arg;
1977 struct nfs_closeres res;
1978 struct nfs_fattr fattr;
1979 unsigned long timestamp;
1980 bool roc;
1981 u32 roc_barrier;
1982};
1983
1984static void nfs4_free_closedata(void *data)
1985{
1986 struct nfs4_closedata *calldata = data;
1987 struct nfs4_state_owner *sp = calldata->state->owner;
1988 struct super_block *sb = calldata->state->inode->i_sb;
1989
1990 if (calldata->roc)
1991 pnfs_roc_release(calldata->state->inode);
1992 nfs4_put_open_state(calldata->state);
1993 nfs_free_seqid(calldata->arg.seqid);
1994 nfs4_put_state_owner(sp);
1995 nfs_sb_deactive(sb);
1996 kfree(calldata);
1997}
1998
1999static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2000 fmode_t fmode)
2001{
2002 spin_lock(&state->owner->so_lock);
2003 if (!(fmode & FMODE_READ))
2004 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2005 if (!(fmode & FMODE_WRITE))
2006 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2007 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2008 spin_unlock(&state->owner->so_lock);
2009}
2010
2011static void nfs4_close_done(struct rpc_task *task, void *data)
2012{
2013 struct nfs4_closedata *calldata = data;
2014 struct nfs4_state *state = calldata->state;
2015 struct nfs_server *server = NFS_SERVER(calldata->inode);
2016
2017 dprintk("%s: begin!\n", __func__);
2018 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2019 return;
2020 /* hmm. we are done with the inode, and in the process of freeing
2021 * the state_owner. we keep this around to process errors
2022 */
2023 switch (task->tk_status) {
2024 case 0:
2025 if (calldata->roc)
2026 pnfs_roc_set_barrier(state->inode,
2027 calldata->roc_barrier);
2028 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2029 renew_lease(server, calldata->timestamp);
2030 nfs4_close_clear_stateid_flags(state,
2031 calldata->arg.fmode);
2032 break;
2033 case -NFS4ERR_STALE_STATEID:
2034 case -NFS4ERR_OLD_STATEID:
2035 case -NFS4ERR_BAD_STATEID:
2036 case -NFS4ERR_EXPIRED:
2037 if (calldata->arg.fmode == 0)
2038 break;
2039 default:
2040 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2041 rpc_restart_call_prepare(task);
2042 }
2043 nfs_release_seqid(calldata->arg.seqid);
2044 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2045 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2046}
2047
2048static void nfs4_close_prepare(struct rpc_task *task, void *data)
2049{
2050 struct nfs4_closedata *calldata = data;
2051 struct nfs4_state *state = calldata->state;
2052 int call_close = 0;
2053
2054 dprintk("%s: begin!\n", __func__);
2055 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2056 return;
2057
2058 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2059 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2060 spin_lock(&state->owner->so_lock);
2061 /* Calculate the change in open mode */
2062 if (state->n_rdwr == 0) {
2063 if (state->n_rdonly == 0) {
2064 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2065 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2066 calldata->arg.fmode &= ~FMODE_READ;
2067 }
2068 if (state->n_wronly == 0) {
2069 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2070 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2071 calldata->arg.fmode &= ~FMODE_WRITE;
2072 }
2073 }
2074 spin_unlock(&state->owner->so_lock);
2075
2076 if (!call_close) {
2077 /* Note: exit _without_ calling nfs4_close_done */
2078 task->tk_action = NULL;
2079 goto out;
2080 }
2081
2082 if (calldata->arg.fmode == 0) {
2083 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2084 if (calldata->roc &&
2085 pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2086 rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2087 task, NULL);
2088 goto out;
2089 }
2090 }
2091
2092 nfs_fattr_init(calldata->res.fattr);
2093 calldata->timestamp = jiffies;
2094 if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2095 &calldata->arg.seq_args,
2096 &calldata->res.seq_res,
2097 task))
2098 goto out;
2099 rpc_call_start(task);
2100out:
2101 dprintk("%s: done!\n", __func__);
2102}
2103
2104static const struct rpc_call_ops nfs4_close_ops = {
2105 .rpc_call_prepare = nfs4_close_prepare,
2106 .rpc_call_done = nfs4_close_done,
2107 .rpc_release = nfs4_free_closedata,
2108};
2109
2110/*
2111 * It is possible for data to be read/written from a mem-mapped file
2112 * after the sys_close call (which hits the vfs layer as a flush).
2113 * This means that we can't safely call nfsv4 close on a file until
2114 * the inode is cleared. This in turn means that we are not good
2115 * NFSv4 citizens - we do not indicate to the server to update the file's
2116 * share state even when we are done with one of the three share
2117 * stateid's in the inode.
2118 *
2119 * NOTE: Caller must be holding the sp->so_owner semaphore!
2120 */
2121int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2122{
2123 struct nfs_server *server = NFS_SERVER(state->inode);
2124 struct nfs4_closedata *calldata;
2125 struct nfs4_state_owner *sp = state->owner;
2126 struct rpc_task *task;
2127 struct rpc_message msg = {
2128 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2129 .rpc_cred = state->owner->so_cred,
2130 };
2131 struct rpc_task_setup task_setup_data = {
2132 .rpc_client = server->client,
2133 .rpc_message = &msg,
2134 .callback_ops = &nfs4_close_ops,
2135 .workqueue = nfsiod_workqueue,
2136 .flags = RPC_TASK_ASYNC,
2137 };
2138 int status = -ENOMEM;
2139
2140 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2141 if (calldata == NULL)
2142 goto out;
2143 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2144 calldata->inode = state->inode;
2145 calldata->state = state;
2146 calldata->arg.fh = NFS_FH(state->inode);
2147 calldata->arg.stateid = &state->open_stateid;
2148 /* Serialization for the sequence id */
2149 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2150 if (calldata->arg.seqid == NULL)
2151 goto out_free_calldata;
2152 calldata->arg.fmode = 0;
2153 calldata->arg.bitmask = server->cache_consistency_bitmask;
2154 calldata->res.fattr = &calldata->fattr;
2155 calldata->res.seqid = calldata->arg.seqid;
2156 calldata->res.server = server;
2157 calldata->roc = roc;
2158 nfs_sb_active(calldata->inode->i_sb);
2159
2160 msg.rpc_argp = &calldata->arg;
2161 msg.rpc_resp = &calldata->res;
2162 task_setup_data.callback_data = calldata;
2163 task = rpc_run_task(&task_setup_data);
2164 if (IS_ERR(task))
2165 return PTR_ERR(task);
2166 status = 0;
2167 if (wait)
2168 status = rpc_wait_for_completion_task(task);
2169 rpc_put_task(task);
2170 return status;
2171out_free_calldata:
2172 kfree(calldata);
2173out:
2174 if (roc)
2175 pnfs_roc_release(state->inode);
2176 nfs4_put_open_state(state);
2177 nfs4_put_state_owner(sp);
2178 return status;
2179}
2180
2181static struct inode *
2182nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2183{
2184 struct nfs4_state *state;
2185
2186 /* Protect against concurrent sillydeletes */
2187 state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2188 if (IS_ERR(state))
2189 return ERR_CAST(state);
2190 ctx->state = state;
2191 return igrab(state->inode);
2192}
2193
2194static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2195{
2196 if (ctx->state == NULL)
2197 return;
2198 if (is_sync)
2199 nfs4_close_sync(ctx->state, ctx->mode);
2200 else
2201 nfs4_close_state(ctx->state, ctx->mode);
2202}
2203
2204static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2205{
2206 struct nfs4_server_caps_arg args = {
2207 .fhandle = fhandle,
2208 };
2209 struct nfs4_server_caps_res res = {};
2210 struct rpc_message msg = {
2211 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2212 .rpc_argp = &args,
2213 .rpc_resp = &res,
2214 };
2215 int status;
2216
2217 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2218 if (status == 0) {
2219 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2220 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2221 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2222 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2223 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2224 NFS_CAP_CTIME|NFS_CAP_MTIME);
2225 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2226 server->caps |= NFS_CAP_ACLS;
2227 if (res.has_links != 0)
2228 server->caps |= NFS_CAP_HARDLINKS;
2229 if (res.has_symlinks != 0)
2230 server->caps |= NFS_CAP_SYMLINKS;
2231 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2232 server->caps |= NFS_CAP_FILEID;
2233 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2234 server->caps |= NFS_CAP_MODE;
2235 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2236 server->caps |= NFS_CAP_NLINK;
2237 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2238 server->caps |= NFS_CAP_OWNER;
2239 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2240 server->caps |= NFS_CAP_OWNER_GROUP;
2241 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2242 server->caps |= NFS_CAP_ATIME;
2243 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2244 server->caps |= NFS_CAP_CTIME;
2245 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2246 server->caps |= NFS_CAP_MTIME;
2247
2248 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2249 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2250 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2251 server->acl_bitmask = res.acl_bitmask;
2252 server->fh_expire_type = res.fh_expire_type;
2253 }
2254
2255 return status;
2256}
2257
2258int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2259{
2260 struct nfs4_exception exception = { };
2261 int err;
2262 do {
2263 err = nfs4_handle_exception(server,
2264 _nfs4_server_capabilities(server, fhandle),
2265 &exception);
2266 } while (exception.retry);
2267 return err;
2268}
2269
2270static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2271 struct nfs_fsinfo *info)
2272{
2273 struct nfs4_lookup_root_arg args = {
2274 .bitmask = nfs4_fattr_bitmap,
2275 };
2276 struct nfs4_lookup_res res = {
2277 .server = server,
2278 .fattr = info->fattr,
2279 .fh = fhandle,
2280 };
2281 struct rpc_message msg = {
2282 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2283 .rpc_argp = &args,
2284 .rpc_resp = &res,
2285 };
2286
2287 nfs_fattr_init(info->fattr);
2288 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2289}
2290
2291static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2292 struct nfs_fsinfo *info)
2293{
2294 struct nfs4_exception exception = { };
2295 int err;
2296 do {
2297 err = _nfs4_lookup_root(server, fhandle, info);
2298 switch (err) {
2299 case 0:
2300 case -NFS4ERR_WRONGSEC:
2301 goto out;
2302 default:
2303 err = nfs4_handle_exception(server, err, &exception);
2304 }
2305 } while (exception.retry);
2306out:
2307 return err;
2308}
2309
2310static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2311 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2312{
2313 struct rpc_auth *auth;
2314 int ret;
2315
2316 auth = rpcauth_create(flavor, server->client);
2317 if (!auth) {
2318 ret = -EIO;
2319 goto out;
2320 }
2321 ret = nfs4_lookup_root(server, fhandle, info);
2322out:
2323 return ret;
2324}
2325
2326static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2327 struct nfs_fsinfo *info)
2328{
2329 int i, len, status = 0;
2330 rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2331
2332 len = gss_mech_list_pseudoflavors(&flav_array[0]);
2333 flav_array[len] = RPC_AUTH_NULL;
2334 len += 1;
2335
2336 for (i = 0; i < len; i++) {
2337 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2338 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2339 continue;
2340 break;
2341 }
2342 /*
2343 * -EACCESS could mean that the user doesn't have correct permissions
2344 * to access the mount. It could also mean that we tried to mount
2345 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2346 * existing mount programs don't handle -EACCES very well so it should
2347 * be mapped to -EPERM instead.
2348 */
2349 if (status == -EACCES)
2350 status = -EPERM;
2351 return status;
2352}
2353
2354/*
2355 * get the file handle for the "/" directory on the server
2356 */
2357static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2358 struct nfs_fsinfo *info)
2359{
2360 int minor_version = server->nfs_client->cl_minorversion;
2361 int status = nfs4_lookup_root(server, fhandle, info);
2362 if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2363 /*
2364 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2365 * by nfs4_map_errors() as this function exits.
2366 */
2367 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2368 if (status == 0)
2369 status = nfs4_server_capabilities(server, fhandle);
2370 if (status == 0)
2371 status = nfs4_do_fsinfo(server, fhandle, info);
2372 return nfs4_map_errors(status);
2373}
2374
2375/*
2376 * Get locations and (maybe) other attributes of a referral.
2377 * Note that we'll actually follow the referral later when
2378 * we detect fsid mismatch in inode revalidation
2379 */
2380static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2381 struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2382{
2383 int status = -ENOMEM;
2384 struct page *page = NULL;
2385 struct nfs4_fs_locations *locations = NULL;
2386
2387 page = alloc_page(GFP_KERNEL);
2388 if (page == NULL)
2389 goto out;
2390 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2391 if (locations == NULL)
2392 goto out;
2393
2394 status = nfs4_proc_fs_locations(dir, name, locations, page);
2395 if (status != 0)
2396 goto out;
2397 /* Make sure server returned a different fsid for the referral */
2398 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2399 dprintk("%s: server did not return a different fsid for"
2400 " a referral at %s\n", __func__, name->name);
2401 status = -EIO;
2402 goto out;
2403 }
2404 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2405 nfs_fixup_referral_attributes(&locations->fattr);
2406
2407 /* replace the lookup nfs_fattr with the locations nfs_fattr */
2408 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2409 memset(fhandle, 0, sizeof(struct nfs_fh));
2410out:
2411 if (page)
2412 __free_page(page);
2413 kfree(locations);
2414 return status;
2415}
2416
2417static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2418{
2419 struct nfs4_getattr_arg args = {
2420 .fh = fhandle,
2421 .bitmask = server->attr_bitmask,
2422 };
2423 struct nfs4_getattr_res res = {
2424 .fattr = fattr,
2425 .server = server,
2426 };
2427 struct rpc_message msg = {
2428 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2429 .rpc_argp = &args,
2430 .rpc_resp = &res,
2431 };
2432
2433 nfs_fattr_init(fattr);
2434 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2435}
2436
2437static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2438{
2439 struct nfs4_exception exception = { };
2440 int err;
2441 do {
2442 err = nfs4_handle_exception(server,
2443 _nfs4_proc_getattr(server, fhandle, fattr),
2444 &exception);
2445 } while (exception.retry);
2446 return err;
2447}
2448
2449/*
2450 * The file is not closed if it is opened due to the a request to change
2451 * the size of the file. The open call will not be needed once the
2452 * VFS layer lookup-intents are implemented.
2453 *
2454 * Close is called when the inode is destroyed.
2455 * If we haven't opened the file for O_WRONLY, we
2456 * need to in the size_change case to obtain a stateid.
2457 *
2458 * Got race?
2459 * Because OPEN is always done by name in nfsv4, it is
2460 * possible that we opened a different file by the same
2461 * name. We can recognize this race condition, but we
2462 * can't do anything about it besides returning an error.
2463 *
2464 * This will be fixed with VFS changes (lookup-intent).
2465 */
2466static int
2467nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2468 struct iattr *sattr)
2469{
2470 struct inode *inode = dentry->d_inode;
2471 struct rpc_cred *cred = NULL;
2472 struct nfs4_state *state = NULL;
2473 int status;
2474
2475 if (pnfs_ld_layoutret_on_setattr(inode))
2476 pnfs_return_layout(inode);
2477
2478 nfs_fattr_init(fattr);
2479
2480 /* Search for an existing open(O_WRITE) file */
2481 if (sattr->ia_valid & ATTR_FILE) {
2482 struct nfs_open_context *ctx;
2483
2484 ctx = nfs_file_open_context(sattr->ia_file);
2485 if (ctx) {
2486 cred = ctx->cred;
2487 state = ctx->state;
2488 }
2489 }
2490
2491 /* Deal with open(O_TRUNC) */
2492 if (sattr->ia_valid & ATTR_OPEN)
2493 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2494
2495 status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2496 if (status == 0)
2497 nfs_setattr_update_inode(inode, sattr);
2498 return status;
2499}
2500
2501static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2502 const struct qstr *name, struct nfs_fh *fhandle,
2503 struct nfs_fattr *fattr)
2504{
2505 struct nfs_server *server = NFS_SERVER(dir);
2506 int status;
2507 struct nfs4_lookup_arg args = {
2508 .bitmask = server->attr_bitmask,
2509 .dir_fh = NFS_FH(dir),
2510 .name = name,
2511 };
2512 struct nfs4_lookup_res res = {
2513 .server = server,
2514 .fattr = fattr,
2515 .fh = fhandle,
2516 };
2517 struct rpc_message msg = {
2518 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2519 .rpc_argp = &args,
2520 .rpc_resp = &res,
2521 };
2522
2523 nfs_fattr_init(fattr);
2524
2525 dprintk("NFS call lookup %s\n", name->name);
2526 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2527 dprintk("NFS reply lookup: %d\n", status);
2528 return status;
2529}
2530
2531void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2532{
2533 memset(fh, 0, sizeof(struct nfs_fh));
2534 fattr->fsid.major = 1;
2535 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2536 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2537 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2538 fattr->nlink = 2;
2539}
2540
2541static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2542 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2543{
2544 struct nfs4_exception exception = { };
2545 int err;
2546 do {
2547 int status;
2548
2549 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2550 switch (status) {
2551 case -NFS4ERR_BADNAME:
2552 return -ENOENT;
2553 case -NFS4ERR_MOVED:
2554 return nfs4_get_referral(dir, name, fattr, fhandle);
2555 case -NFS4ERR_WRONGSEC:
2556 nfs_fixup_secinfo_attributes(fattr, fhandle);
2557 }
2558 err = nfs4_handle_exception(NFS_SERVER(dir),
2559 status, &exception);
2560 } while (exception.retry);
2561 return err;
2562}
2563
2564static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2565{
2566 struct nfs_server *server = NFS_SERVER(inode);
2567 struct nfs4_accessargs args = {
2568 .fh = NFS_FH(inode),
2569 .bitmask = server->cache_consistency_bitmask,
2570 };
2571 struct nfs4_accessres res = {
2572 .server = server,
2573 };
2574 struct rpc_message msg = {
2575 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2576 .rpc_argp = &args,
2577 .rpc_resp = &res,
2578 .rpc_cred = entry->cred,
2579 };
2580 int mode = entry->mask;
2581 int status;
2582
2583 /*
2584 * Determine which access bits we want to ask for...
2585 */
2586 if (mode & MAY_READ)
2587 args.access |= NFS4_ACCESS_READ;
2588 if (S_ISDIR(inode->i_mode)) {
2589 if (mode & MAY_WRITE)
2590 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2591 if (mode & MAY_EXEC)
2592 args.access |= NFS4_ACCESS_LOOKUP;
2593 } else {
2594 if (mode & MAY_WRITE)
2595 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2596 if (mode & MAY_EXEC)
2597 args.access |= NFS4_ACCESS_EXECUTE;
2598 }
2599
2600 res.fattr = nfs_alloc_fattr();
2601 if (res.fattr == NULL)
2602 return -ENOMEM;
2603
2604 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2605 if (!status) {
2606 entry->mask = 0;
2607 if (res.access & NFS4_ACCESS_READ)
2608 entry->mask |= MAY_READ;
2609 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2610 entry->mask |= MAY_WRITE;
2611 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2612 entry->mask |= MAY_EXEC;
2613 nfs_refresh_inode(inode, res.fattr);
2614 }
2615 nfs_free_fattr(res.fattr);
2616 return status;
2617}
2618
2619static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2620{
2621 struct nfs4_exception exception = { };
2622 int err;
2623 do {
2624 err = nfs4_handle_exception(NFS_SERVER(inode),
2625 _nfs4_proc_access(inode, entry),
2626 &exception);
2627 } while (exception.retry);
2628 return err;
2629}
2630
2631/*
2632 * TODO: For the time being, we don't try to get any attributes
2633 * along with any of the zero-copy operations READ, READDIR,
2634 * READLINK, WRITE.
2635 *
2636 * In the case of the first three, we want to put the GETATTR
2637 * after the read-type operation -- this is because it is hard
2638 * to predict the length of a GETATTR response in v4, and thus
2639 * align the READ data correctly. This means that the GETATTR
2640 * may end up partially falling into the page cache, and we should
2641 * shift it into the 'tail' of the xdr_buf before processing.
2642 * To do this efficiently, we need to know the total length
2643 * of data received, which doesn't seem to be available outside
2644 * of the RPC layer.
2645 *
2646 * In the case of WRITE, we also want to put the GETATTR after
2647 * the operation -- in this case because we want to make sure
2648 * we get the post-operation mtime and size. This means that
2649 * we can't use xdr_encode_pages() as written: we need a variant
2650 * of it which would leave room in the 'tail' iovec.
2651 *
2652 * Both of these changes to the XDR layer would in fact be quite
2653 * minor, but I decided to leave them for a subsequent patch.
2654 */
2655static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2656 unsigned int pgbase, unsigned int pglen)
2657{
2658 struct nfs4_readlink args = {
2659 .fh = NFS_FH(inode),
2660 .pgbase = pgbase,
2661 .pglen = pglen,
2662 .pages = &page,
2663 };
2664 struct nfs4_readlink_res res;
2665 struct rpc_message msg = {
2666 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2667 .rpc_argp = &args,
2668 .rpc_resp = &res,
2669 };
2670
2671 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2672}
2673
2674static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2675 unsigned int pgbase, unsigned int pglen)
2676{
2677 struct nfs4_exception exception = { };
2678 int err;
2679 do {
2680 err = nfs4_handle_exception(NFS_SERVER(inode),
2681 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2682 &exception);
2683 } while (exception.retry);
2684 return err;
2685}
2686
2687/*
2688 * Got race?
2689 * We will need to arrange for the VFS layer to provide an atomic open.
2690 * Until then, this create/open method is prone to inefficiency and race
2691 * conditions due to the lookup, create, and open VFS calls from sys_open()
2692 * placed on the wire.
2693 *
2694 * Given the above sorry state of affairs, I'm simply sending an OPEN.
2695 * The file will be opened again in the subsequent VFS open call
2696 * (nfs4_proc_file_open).
2697 *
2698 * The open for read will just hang around to be used by any process that
2699 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2700 */
2701
2702static int
2703nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2704 int flags, struct nfs_open_context *ctx)
2705{
2706 struct dentry *de = dentry;
2707 struct nfs4_state *state;
2708 struct rpc_cred *cred = NULL;
2709 fmode_t fmode = 0;
2710 int status = 0;
2711
2712 if (ctx != NULL) {
2713 cred = ctx->cred;
2714 de = ctx->dentry;
2715 fmode = ctx->mode;
2716 }
2717 sattr->ia_mode &= ~current_umask();
2718 state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2719 d_drop(dentry);
2720 if (IS_ERR(state)) {
2721 status = PTR_ERR(state);
2722 goto out;
2723 }
2724 d_add(dentry, igrab(state->inode));
2725 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2726 if (ctx != NULL)
2727 ctx->state = state;
2728 else
2729 nfs4_close_sync(state, fmode);
2730out:
2731 return status;
2732}
2733
2734static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2735{
2736 struct nfs_server *server = NFS_SERVER(dir);
2737 struct nfs_removeargs args = {
2738 .fh = NFS_FH(dir),
2739 .name.len = name->len,
2740 .name.name = name->name,
2741 .bitmask = server->attr_bitmask,
2742 };
2743 struct nfs_removeres res = {
2744 .server = server,
2745 };
2746 struct rpc_message msg = {
2747 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2748 .rpc_argp = &args,
2749 .rpc_resp = &res,
2750 };
2751 int status = -ENOMEM;
2752
2753 res.dir_attr = nfs_alloc_fattr();
2754 if (res.dir_attr == NULL)
2755 goto out;
2756
2757 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2758 if (status == 0) {
2759 update_changeattr(dir, &res.cinfo);
2760 nfs_post_op_update_inode(dir, res.dir_attr);
2761 }
2762 nfs_free_fattr(res.dir_attr);
2763out:
2764 return status;
2765}
2766
2767static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2768{
2769 struct nfs4_exception exception = { };
2770 int err;
2771 do {
2772 err = nfs4_handle_exception(NFS_SERVER(dir),
2773 _nfs4_proc_remove(dir, name),
2774 &exception);
2775 } while (exception.retry);
2776 return err;
2777}
2778
2779static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2780{
2781 struct nfs_server *server = NFS_SERVER(dir);
2782 struct nfs_removeargs *args = msg->rpc_argp;
2783 struct nfs_removeres *res = msg->rpc_resp;
2784
2785 args->bitmask = server->cache_consistency_bitmask;
2786 res->server = server;
2787 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2788 nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2789}
2790
2791static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2792{
2793 if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2794 &data->args.seq_args,
2795 &data->res.seq_res,
2796 task))
2797 return;
2798 rpc_call_start(task);
2799}
2800
2801static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2802{
2803 struct nfs_removeres *res = task->tk_msg.rpc_resp;
2804
2805 if (!nfs4_sequence_done(task, &res->seq_res))
2806 return 0;
2807 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2808 return 0;
2809 update_changeattr(dir, &res->cinfo);
2810 nfs_post_op_update_inode(dir, res->dir_attr);
2811 return 1;
2812}
2813
2814static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2815{
2816 struct nfs_server *server = NFS_SERVER(dir);
2817 struct nfs_renameargs *arg = msg->rpc_argp;
2818 struct nfs_renameres *res = msg->rpc_resp;
2819
2820 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2821 arg->bitmask = server->attr_bitmask;
2822 res->server = server;
2823 nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2824}
2825
2826static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2827{
2828 if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2829 &data->args.seq_args,
2830 &data->res.seq_res,
2831 task))
2832 return;
2833 rpc_call_start(task);
2834}
2835
2836static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2837 struct inode *new_dir)
2838{
2839 struct nfs_renameres *res = task->tk_msg.rpc_resp;
2840
2841 if (!nfs4_sequence_done(task, &res->seq_res))
2842 return 0;
2843 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2844 return 0;
2845
2846 update_changeattr(old_dir, &res->old_cinfo);
2847 nfs_post_op_update_inode(old_dir, res->old_fattr);
2848 update_changeattr(new_dir, &res->new_cinfo);
2849 nfs_post_op_update_inode(new_dir, res->new_fattr);
2850 return 1;
2851}
2852
2853static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2854 struct inode *new_dir, struct qstr *new_name)
2855{
2856 struct nfs_server *server = NFS_SERVER(old_dir);
2857 struct nfs_renameargs arg = {
2858 .old_dir = NFS_FH(old_dir),
2859 .new_dir = NFS_FH(new_dir),
2860 .old_name = old_name,
2861 .new_name = new_name,
2862 .bitmask = server->attr_bitmask,
2863 };
2864 struct nfs_renameres res = {
2865 .server = server,
2866 };
2867 struct rpc_message msg = {
2868 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2869 .rpc_argp = &arg,
2870 .rpc_resp = &res,
2871 };
2872 int status = -ENOMEM;
2873
2874 res.old_fattr = nfs_alloc_fattr();
2875 res.new_fattr = nfs_alloc_fattr();
2876 if (res.old_fattr == NULL || res.new_fattr == NULL)
2877 goto out;
2878
2879 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2880 if (!status) {
2881 update_changeattr(old_dir, &res.old_cinfo);
2882 nfs_post_op_update_inode(old_dir, res.old_fattr);
2883 update_changeattr(new_dir, &res.new_cinfo);
2884 nfs_post_op_update_inode(new_dir, res.new_fattr);
2885 }
2886out:
2887 nfs_free_fattr(res.new_fattr);
2888 nfs_free_fattr(res.old_fattr);
2889 return status;
2890}
2891
2892static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2893 struct inode *new_dir, struct qstr *new_name)
2894{
2895 struct nfs4_exception exception = { };
2896 int err;
2897 do {
2898 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2899 _nfs4_proc_rename(old_dir, old_name,
2900 new_dir, new_name),
2901 &exception);
2902 } while (exception.retry);
2903 return err;
2904}
2905
2906static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2907{
2908 struct nfs_server *server = NFS_SERVER(inode);
2909 struct nfs4_link_arg arg = {
2910 .fh = NFS_FH(inode),
2911 .dir_fh = NFS_FH(dir),
2912 .name = name,
2913 .bitmask = server->attr_bitmask,
2914 };
2915 struct nfs4_link_res res = {
2916 .server = server,
2917 };
2918 struct rpc_message msg = {
2919 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2920 .rpc_argp = &arg,
2921 .rpc_resp = &res,
2922 };
2923 int status = -ENOMEM;
2924
2925 res.fattr = nfs_alloc_fattr();
2926 res.dir_attr = nfs_alloc_fattr();
2927 if (res.fattr == NULL || res.dir_attr == NULL)
2928 goto out;
2929
2930 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2931 if (!status) {
2932 update_changeattr(dir, &res.cinfo);
2933 nfs_post_op_update_inode(dir, res.dir_attr);
2934 nfs_post_op_update_inode(inode, res.fattr);
2935 }
2936out:
2937 nfs_free_fattr(res.dir_attr);
2938 nfs_free_fattr(res.fattr);
2939 return status;
2940}
2941
2942static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2943{
2944 struct nfs4_exception exception = { };
2945 int err;
2946 do {
2947 err = nfs4_handle_exception(NFS_SERVER(inode),
2948 _nfs4_proc_link(inode, dir, name),
2949 &exception);
2950 } while (exception.retry);
2951 return err;
2952}
2953
2954struct nfs4_createdata {
2955 struct rpc_message msg;
2956 struct nfs4_create_arg arg;
2957 struct nfs4_create_res res;
2958 struct nfs_fh fh;
2959 struct nfs_fattr fattr;
2960 struct nfs_fattr dir_fattr;
2961};
2962
2963static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2964 struct qstr *name, struct iattr *sattr, u32 ftype)
2965{
2966 struct nfs4_createdata *data;
2967
2968 data = kzalloc(sizeof(*data), GFP_KERNEL);
2969 if (data != NULL) {
2970 struct nfs_server *server = NFS_SERVER(dir);
2971
2972 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2973 data->msg.rpc_argp = &data->arg;
2974 data->msg.rpc_resp = &data->res;
2975 data->arg.dir_fh = NFS_FH(dir);
2976 data->arg.server = server;
2977 data->arg.name = name;
2978 data->arg.attrs = sattr;
2979 data->arg.ftype = ftype;
2980 data->arg.bitmask = server->attr_bitmask;
2981 data->res.server = server;
2982 data->res.fh = &data->fh;
2983 data->res.fattr = &data->fattr;
2984 data->res.dir_fattr = &data->dir_fattr;
2985 nfs_fattr_init(data->res.fattr);
2986 nfs_fattr_init(data->res.dir_fattr);
2987 }
2988 return data;
2989}
2990
2991static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2992{
2993 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2994 &data->arg.seq_args, &data->res.seq_res, 1);
2995 if (status == 0) {
2996 update_changeattr(dir, &data->res.dir_cinfo);
2997 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2998 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2999 }
3000 return status;
3001}
3002
3003static void nfs4_free_createdata(struct nfs4_createdata *data)
3004{
3005 kfree(data);
3006}
3007
3008static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3009 struct page *page, unsigned int len, struct iattr *sattr)
3010{
3011 struct nfs4_createdata *data;
3012 int status = -ENAMETOOLONG;
3013
3014 if (len > NFS4_MAXPATHLEN)
3015 goto out;
3016
3017 status = -ENOMEM;
3018 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3019 if (data == NULL)
3020 goto out;
3021
3022 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3023 data->arg.u.symlink.pages = &page;
3024 data->arg.u.symlink.len = len;
3025
3026 status = nfs4_do_create(dir, dentry, data);
3027
3028 nfs4_free_createdata(data);
3029out:
3030 return status;
3031}
3032
3033static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3034 struct page *page, unsigned int len, struct iattr *sattr)
3035{
3036 struct nfs4_exception exception = { };
3037 int err;
3038 do {
3039 err = nfs4_handle_exception(NFS_SERVER(dir),
3040 _nfs4_proc_symlink(dir, dentry, page,
3041 len, sattr),
3042 &exception);
3043 } while (exception.retry);
3044 return err;
3045}
3046
3047static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3048 struct iattr *sattr)
3049{
3050 struct nfs4_createdata *data;
3051 int status = -ENOMEM;
3052
3053 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3054 if (data == NULL)
3055 goto out;
3056
3057 status = nfs4_do_create(dir, dentry, data);
3058
3059 nfs4_free_createdata(data);
3060out:
3061 return status;
3062}
3063
3064static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3065 struct iattr *sattr)
3066{
3067 struct nfs4_exception exception = { };
3068 int err;
3069
3070 sattr->ia_mode &= ~current_umask();
3071 do {
3072 err = nfs4_handle_exception(NFS_SERVER(dir),
3073 _nfs4_proc_mkdir(dir, dentry, sattr),
3074 &exception);
3075 } while (exception.retry);
3076 return err;
3077}
3078
3079static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3080 u64 cookie, struct page **pages, unsigned int count, int plus)
3081{
3082 struct inode *dir = dentry->d_inode;
3083 struct nfs4_readdir_arg args = {
3084 .fh = NFS_FH(dir),
3085 .pages = pages,
3086 .pgbase = 0,
3087 .count = count,
3088 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3089 .plus = plus,
3090 };
3091 struct nfs4_readdir_res res;
3092 struct rpc_message msg = {
3093 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3094 .rpc_argp = &args,
3095 .rpc_resp = &res,
3096 .rpc_cred = cred,
3097 };
3098 int status;
3099
3100 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3101 dentry->d_parent->d_name.name,
3102 dentry->d_name.name,
3103 (unsigned long long)cookie);
3104 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3105 res.pgbase = args.pgbase;
3106 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3107 if (status >= 0) {
3108 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3109 status += args.pgbase;
3110 }
3111
3112 nfs_invalidate_atime(dir);
3113
3114 dprintk("%s: returns %d\n", __func__, status);
3115 return status;
3116}
3117
3118static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3119 u64 cookie, struct page **pages, unsigned int count, int plus)
3120{
3121 struct nfs4_exception exception = { };
3122 int err;
3123 do {
3124 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3125 _nfs4_proc_readdir(dentry, cred, cookie,
3126 pages, count, plus),
3127 &exception);
3128 } while (exception.retry);
3129 return err;
3130}
3131
3132static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3133 struct iattr *sattr, dev_t rdev)
3134{
3135 struct nfs4_createdata *data;
3136 int mode = sattr->ia_mode;
3137 int status = -ENOMEM;
3138
3139 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3140 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3141
3142 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3143 if (data == NULL)
3144 goto out;
3145
3146 if (S_ISFIFO(mode))
3147 data->arg.ftype = NF4FIFO;
3148 else if (S_ISBLK(mode)) {
3149 data->arg.ftype = NF4BLK;
3150 data->arg.u.device.specdata1 = MAJOR(rdev);
3151 data->arg.u.device.specdata2 = MINOR(rdev);
3152 }
3153 else if (S_ISCHR(mode)) {
3154 data->arg.ftype = NF4CHR;
3155 data->arg.u.device.specdata1 = MAJOR(rdev);
3156 data->arg.u.device.specdata2 = MINOR(rdev);
3157 }
3158
3159 status = nfs4_do_create(dir, dentry, data);
3160
3161 nfs4_free_createdata(data);
3162out:
3163 return status;
3164}
3165
3166static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3167 struct iattr *sattr, dev_t rdev)
3168{
3169 struct nfs4_exception exception = { };
3170 int err;
3171
3172 sattr->ia_mode &= ~current_umask();
3173 do {
3174 err = nfs4_handle_exception(NFS_SERVER(dir),
3175 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3176 &exception);
3177 } while (exception.retry);
3178 return err;
3179}
3180
3181static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3182 struct nfs_fsstat *fsstat)
3183{
3184 struct nfs4_statfs_arg args = {
3185 .fh = fhandle,
3186 .bitmask = server->attr_bitmask,
3187 };
3188 struct nfs4_statfs_res res = {
3189 .fsstat = fsstat,
3190 };
3191 struct rpc_message msg = {
3192 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3193 .rpc_argp = &args,
3194 .rpc_resp = &res,
3195 };
3196
3197 nfs_fattr_init(fsstat->fattr);
3198 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3199}
3200
3201static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3202{
3203 struct nfs4_exception exception = { };
3204 int err;
3205 do {
3206 err = nfs4_handle_exception(server,
3207 _nfs4_proc_statfs(server, fhandle, fsstat),
3208 &exception);
3209 } while (exception.retry);
3210 return err;
3211}
3212
3213static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3214 struct nfs_fsinfo *fsinfo)
3215{
3216 struct nfs4_fsinfo_arg args = {
3217 .fh = fhandle,
3218 .bitmask = server->attr_bitmask,
3219 };
3220 struct nfs4_fsinfo_res res = {
3221 .fsinfo = fsinfo,
3222 };
3223 struct rpc_message msg = {
3224 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3225 .rpc_argp = &args,
3226 .rpc_resp = &res,
3227 };
3228
3229 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3230}
3231
3232static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3233{
3234 struct nfs4_exception exception = { };
3235 int err;
3236
3237 do {
3238 err = nfs4_handle_exception(server,
3239 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3240 &exception);
3241 } while (exception.retry);
3242 return err;
3243}
3244
3245static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3246{
3247 nfs_fattr_init(fsinfo->fattr);
3248 return nfs4_do_fsinfo(server, fhandle, fsinfo);
3249}
3250
3251static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3252 struct nfs_pathconf *pathconf)
3253{
3254 struct nfs4_pathconf_arg args = {
3255 .fh = fhandle,
3256 .bitmask = server->attr_bitmask,
3257 };
3258 struct nfs4_pathconf_res res = {
3259 .pathconf = pathconf,
3260 };
3261 struct rpc_message msg = {
3262 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3263 .rpc_argp = &args,
3264 .rpc_resp = &res,
3265 };
3266
3267 /* None of the pathconf attributes are mandatory to implement */
3268 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3269 memset(pathconf, 0, sizeof(*pathconf));
3270 return 0;
3271 }
3272
3273 nfs_fattr_init(pathconf->fattr);
3274 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3275}
3276
3277static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3278 struct nfs_pathconf *pathconf)
3279{
3280 struct nfs4_exception exception = { };
3281 int err;
3282
3283 do {
3284 err = nfs4_handle_exception(server,
3285 _nfs4_proc_pathconf(server, fhandle, pathconf),
3286 &exception);
3287 } while (exception.retry);
3288 return err;
3289}
3290
3291void __nfs4_read_done_cb(struct nfs_read_data *data)
3292{
3293 nfs_invalidate_atime(data->inode);
3294}
3295
3296static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3297{
3298 struct nfs_server *server = NFS_SERVER(data->inode);
3299
3300 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3301 rpc_restart_call_prepare(task);
3302 return -EAGAIN;
3303 }
3304
3305 __nfs4_read_done_cb(data);
3306 if (task->tk_status > 0)
3307 renew_lease(server, data->timestamp);
3308 return 0;
3309}
3310
3311static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3312{
3313
3314 dprintk("--> %s\n", __func__);
3315
3316 if (!nfs4_sequence_done(task, &data->res.seq_res))
3317 return -EAGAIN;
3318
3319 return data->read_done_cb ? data->read_done_cb(task, data) :
3320 nfs4_read_done_cb(task, data);
3321}
3322
3323static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3324{
3325 data->timestamp = jiffies;
3326 data->read_done_cb = nfs4_read_done_cb;
3327 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3328 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3329}
3330
3331static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3332{
3333 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3334 &data->args.seq_args,
3335 &data->res.seq_res,
3336 task))
3337 return;
3338 rpc_call_start(task);
3339}
3340
3341/* Reset the the nfs_read_data to send the read to the MDS. */
3342void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3343{
3344 dprintk("%s Reset task for i/o through\n", __func__);
3345 put_lseg(data->lseg);
3346 data->lseg = NULL;
3347 /* offsets will differ in the dense stripe case */
3348 data->args.offset = data->mds_offset;
3349 data->ds_clp = NULL;
3350 data->args.fh = NFS_FH(data->inode);
3351 data->read_done_cb = nfs4_read_done_cb;
3352 task->tk_ops = data->mds_ops;
3353 rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3354}
3355EXPORT_SYMBOL_GPL(nfs4_reset_read);
3356
3357static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3358{
3359 struct inode *inode = data->inode;
3360
3361 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3362 rpc_restart_call_prepare(task);
3363 return -EAGAIN;
3364 }
3365 if (task->tk_status >= 0) {
3366 renew_lease(NFS_SERVER(inode), data->timestamp);
3367 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3368 }
3369 return 0;
3370}
3371
3372static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3373{
3374 if (!nfs4_sequence_done(task, &data->res.seq_res))
3375 return -EAGAIN;
3376 return data->write_done_cb ? data->write_done_cb(task, data) :
3377 nfs4_write_done_cb(task, data);
3378}
3379
3380/* Reset the the nfs_write_data to send the write to the MDS. */
3381void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3382{
3383 dprintk("%s Reset task for i/o through\n", __func__);
3384 put_lseg(data->lseg);
3385 data->lseg = NULL;
3386 data->ds_clp = NULL;
3387 data->write_done_cb = nfs4_write_done_cb;
3388 data->args.fh = NFS_FH(data->inode);
3389 data->args.bitmask = data->res.server->cache_consistency_bitmask;
3390 data->args.offset = data->mds_offset;
3391 data->res.fattr = &data->fattr;
3392 task->tk_ops = data->mds_ops;
3393 rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3394}
3395EXPORT_SYMBOL_GPL(nfs4_reset_write);
3396
3397static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3398{
3399 struct nfs_server *server = NFS_SERVER(data->inode);
3400
3401 if (data->lseg) {
3402 data->args.bitmask = NULL;
3403 data->res.fattr = NULL;
3404 } else
3405 data->args.bitmask = server->cache_consistency_bitmask;
3406 if (!data->write_done_cb)
3407 data->write_done_cb = nfs4_write_done_cb;
3408 data->res.server = server;
3409 data->timestamp = jiffies;
3410
3411 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3412 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3413}
3414
3415static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3416{
3417 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3418 &data->args.seq_args,
3419 &data->res.seq_res,
3420 task))
3421 return;
3422 rpc_call_start(task);
3423}
3424
3425static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3426{
3427 struct inode *inode = data->inode;
3428
3429 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3430 rpc_restart_call_prepare(task);
3431 return -EAGAIN;
3432 }
3433 nfs_refresh_inode(inode, data->res.fattr);
3434 return 0;
3435}
3436
3437static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3438{
3439 if (!nfs4_sequence_done(task, &data->res.seq_res))
3440 return -EAGAIN;
3441 return data->write_done_cb(task, data);
3442}
3443
3444static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3445{
3446 struct nfs_server *server = NFS_SERVER(data->inode);
3447
3448 if (data->lseg) {
3449 data->args.bitmask = NULL;
3450 data->res.fattr = NULL;
3451 } else
3452 data->args.bitmask = server->cache_consistency_bitmask;
3453 if (!data->write_done_cb)
3454 data->write_done_cb = nfs4_commit_done_cb;
3455 data->res.server = server;
3456 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3457 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3458}
3459
3460struct nfs4_renewdata {
3461 struct nfs_client *client;
3462 unsigned long timestamp;
3463};
3464
3465/*
3466 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3467 * standalone procedure for queueing an asynchronous RENEW.
3468 */
3469static void nfs4_renew_release(void *calldata)
3470{
3471 struct nfs4_renewdata *data = calldata;
3472 struct nfs_client *clp = data->client;
3473
3474 if (atomic_read(&clp->cl_count) > 1)
3475 nfs4_schedule_state_renewal(clp);
3476 nfs_put_client(clp);
3477 kfree(data);
3478}
3479
3480static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3481{
3482 struct nfs4_renewdata *data = calldata;
3483 struct nfs_client *clp = data->client;
3484 unsigned long timestamp = data->timestamp;
3485
3486 if (task->tk_status < 0) {
3487 /* Unless we're shutting down, schedule state recovery! */
3488 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3489 return;
3490 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3491 nfs4_schedule_lease_recovery(clp);
3492 return;
3493 }
3494 nfs4_schedule_path_down_recovery(clp);
3495 }
3496 do_renew_lease(clp, timestamp);
3497}
3498
3499static const struct rpc_call_ops nfs4_renew_ops = {
3500 .rpc_call_done = nfs4_renew_done,
3501 .rpc_release = nfs4_renew_release,
3502};
3503
3504static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3505{
3506 struct rpc_message msg = {
3507 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3508 .rpc_argp = clp,
3509 .rpc_cred = cred,
3510 };
3511 struct nfs4_renewdata *data;
3512
3513 if (renew_flags == 0)
3514 return 0;
3515 if (!atomic_inc_not_zero(&clp->cl_count))
3516 return -EIO;
3517 data = kmalloc(sizeof(*data), GFP_NOFS);
3518 if (data == NULL)
3519 return -ENOMEM;
3520 data->client = clp;
3521 data->timestamp = jiffies;
3522 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3523 &nfs4_renew_ops, data);
3524}
3525
3526static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3527{
3528 struct rpc_message msg = {
3529 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3530 .rpc_argp = clp,
3531 .rpc_cred = cred,
3532 };
3533 unsigned long now = jiffies;
3534 int status;
3535
3536 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3537 if (status < 0)
3538 return status;
3539 do_renew_lease(clp, now);
3540 return 0;
3541}
3542
3543static inline int nfs4_server_supports_acls(struct nfs_server *server)
3544{
3545 return (server->caps & NFS_CAP_ACLS)
3546 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3547 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3548}
3549
3550/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3551 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3552 * the stack.
3553 */
3554#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3555
3556static int buf_to_pages_noslab(const void *buf, size_t buflen,
3557 struct page **pages, unsigned int *pgbase)
3558{
3559 struct page *newpage, **spages;
3560 int rc = 0;
3561 size_t len;
3562 spages = pages;
3563
3564 do {
3565 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3566 newpage = alloc_page(GFP_KERNEL);
3567
3568 if (newpage == NULL)
3569 goto unwind;
3570 memcpy(page_address(newpage), buf, len);
3571 buf += len;
3572 buflen -= len;
3573 *pages++ = newpage;
3574 rc++;
3575 } while (buflen != 0);
3576
3577 return rc;
3578
3579unwind:
3580 for(; rc > 0; rc--)
3581 __free_page(spages[rc-1]);
3582 return -ENOMEM;
3583}
3584
3585struct nfs4_cached_acl {
3586 int cached;
3587 size_t len;
3588 char data[0];
3589};
3590
3591static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3592{
3593 struct nfs_inode *nfsi = NFS_I(inode);
3594
3595 spin_lock(&inode->i_lock);
3596 kfree(nfsi->nfs4_acl);
3597 nfsi->nfs4_acl = acl;
3598 spin_unlock(&inode->i_lock);
3599}
3600
3601static void nfs4_zap_acl_attr(struct inode *inode)
3602{
3603 nfs4_set_cached_acl(inode, NULL);
3604}
3605
3606static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3607{
3608 struct nfs_inode *nfsi = NFS_I(inode);
3609 struct nfs4_cached_acl *acl;
3610 int ret = -ENOENT;
3611
3612 spin_lock(&inode->i_lock);
3613 acl = nfsi->nfs4_acl;
3614 if (acl == NULL)
3615 goto out;
3616 if (buf == NULL) /* user is just asking for length */
3617 goto out_len;
3618 if (acl->cached == 0)
3619 goto out;
3620 ret = -ERANGE; /* see getxattr(2) man page */
3621 if (acl->len > buflen)
3622 goto out;
3623 memcpy(buf, acl->data, acl->len);
3624out_len:
3625 ret = acl->len;
3626out:
3627 spin_unlock(&inode->i_lock);
3628 return ret;
3629}
3630
3631static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3632{
3633 struct nfs4_cached_acl *acl;
3634
3635 if (pages && acl_len <= PAGE_SIZE) {
3636 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3637 if (acl == NULL)
3638 goto out;
3639 acl->cached = 1;
3640 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3641 } else {
3642 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3643 if (acl == NULL)
3644 goto out;
3645 acl->cached = 0;
3646 }
3647 acl->len = acl_len;
3648out:
3649 nfs4_set_cached_acl(inode, acl);
3650}
3651
3652/*
3653 * The getxattr API returns the required buffer length when called with a
3654 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3655 * the required buf. On a NULL buf, we send a page of data to the server
3656 * guessing that the ACL request can be serviced by a page. If so, we cache
3657 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3658 * the cache. If not so, we throw away the page, and cache the required
3659 * length. The next getxattr call will then produce another round trip to
3660 * the server, this time with the input buf of the required size.
3661 */
3662static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3663{
3664 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3665 struct nfs_getaclargs args = {
3666 .fh = NFS_FH(inode),
3667 .acl_pages = pages,
3668 .acl_len = buflen,
3669 };
3670 struct nfs_getaclres res = {
3671 .acl_len = buflen,
3672 };
3673 struct rpc_message msg = {
3674 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3675 .rpc_argp = &args,
3676 .rpc_resp = &res,
3677 };
3678 int ret = -ENOMEM, npages, i, acl_len = 0;
3679
3680 npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3681 /* As long as we're doing a round trip to the server anyway,
3682 * let's be prepared for a page of acl data. */
3683 if (npages == 0)
3684 npages = 1;
3685
3686 /* Add an extra page to handle the bitmap returned */
3687 npages++;
3688
3689 for (i = 0; i < npages; i++) {
3690 pages[i] = alloc_page(GFP_KERNEL);
3691 if (!pages[i])
3692 goto out_free;
3693 }
3694
3695 /* for decoding across pages */
3696 res.acl_scratch = alloc_page(GFP_KERNEL);
3697 if (!res.acl_scratch)
3698 goto out_free;
3699
3700 args.acl_len = npages * PAGE_SIZE;
3701 args.acl_pgbase = 0;
3702
3703 /* Let decode_getfacl know not to fail if the ACL data is larger than
3704 * the page we send as a guess */
3705 if (buf == NULL)
3706 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3707
3708 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
3709 __func__, buf, buflen, npages, args.acl_len);
3710 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3711 &msg, &args.seq_args, &res.seq_res, 0);
3712 if (ret)
3713 goto out_free;
3714
3715 acl_len = res.acl_len - res.acl_data_offset;
3716 if (acl_len > args.acl_len)
3717 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3718 else
3719 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3720 acl_len);
3721 if (buf) {
3722 ret = -ERANGE;
3723 if (acl_len > buflen)
3724 goto out_free;
3725 _copy_from_pages(buf, pages, res.acl_data_offset,
3726 acl_len);
3727 }
3728 ret = acl_len;
3729out_free:
3730 for (i = 0; i < npages; i++)
3731 if (pages[i])
3732 __free_page(pages[i]);
3733 if (res.acl_scratch)
3734 __free_page(res.acl_scratch);
3735 return ret;
3736}
3737
3738static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3739{
3740 struct nfs4_exception exception = { };
3741 ssize_t ret;
3742 do {
3743 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3744 if (ret >= 0)
3745 break;
3746 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3747 } while (exception.retry);
3748 return ret;
3749}
3750
3751static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3752{
3753 struct nfs_server *server = NFS_SERVER(inode);
3754 int ret;
3755
3756 if (!nfs4_server_supports_acls(server))
3757 return -EOPNOTSUPP;
3758 ret = nfs_revalidate_inode(server, inode);
3759 if (ret < 0)
3760 return ret;
3761 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3762 nfs_zap_acl_cache(inode);
3763 ret = nfs4_read_cached_acl(inode, buf, buflen);
3764 if (ret != -ENOENT)
3765 /* -ENOENT is returned if there is no ACL or if there is an ACL
3766 * but no cached acl data, just the acl length */
3767 return ret;
3768 return nfs4_get_acl_uncached(inode, buf, buflen);
3769}
3770
3771static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3772{
3773 struct nfs_server *server = NFS_SERVER(inode);
3774 struct page *pages[NFS4ACL_MAXPAGES];
3775 struct nfs_setaclargs arg = {
3776 .fh = NFS_FH(inode),
3777 .acl_pages = pages,
3778 .acl_len = buflen,
3779 };
3780 struct nfs_setaclres res;
3781 struct rpc_message msg = {
3782 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3783 .rpc_argp = &arg,
3784 .rpc_resp = &res,
3785 };
3786 int ret, i;
3787
3788 if (!nfs4_server_supports_acls(server))
3789 return -EOPNOTSUPP;
3790 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3791 if (i < 0)
3792 return i;
3793 nfs_inode_return_delegation(inode);
3794 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3795
3796 /*
3797 * Free each page after tx, so the only ref left is
3798 * held by the network stack
3799 */
3800 for (; i > 0; i--)
3801 put_page(pages[i-1]);
3802
3803 /*
3804 * Acl update can result in inode attribute update.
3805 * so mark the attribute cache invalid.
3806 */
3807 spin_lock(&inode->i_lock);
3808 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3809 spin_unlock(&inode->i_lock);
3810 nfs_access_zap_cache(inode);
3811 nfs_zap_acl_cache(inode);
3812 return ret;
3813}
3814
3815static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3816{
3817 struct nfs4_exception exception = { };
3818 int err;
3819 do {
3820 err = nfs4_handle_exception(NFS_SERVER(inode),
3821 __nfs4_proc_set_acl(inode, buf, buflen),
3822 &exception);
3823 } while (exception.retry);
3824 return err;
3825}
3826
3827static int
3828nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3829{
3830 struct nfs_client *clp = server->nfs_client;
3831
3832 if (task->tk_status >= 0)
3833 return 0;
3834 switch(task->tk_status) {
3835 case -NFS4ERR_DELEG_REVOKED:
3836 case -NFS4ERR_ADMIN_REVOKED:
3837 case -NFS4ERR_BAD_STATEID:
3838 if (state == NULL)
3839 break;
3840 nfs_remove_bad_delegation(state->inode);
3841 case -NFS4ERR_OPENMODE:
3842 if (state == NULL)
3843 break;
3844 nfs4_schedule_stateid_recovery(server, state);
3845 goto wait_on_recovery;
3846 case -NFS4ERR_EXPIRED:
3847 if (state != NULL)
3848 nfs4_schedule_stateid_recovery(server, state);
3849 case -NFS4ERR_STALE_STATEID:
3850 case -NFS4ERR_STALE_CLIENTID:
3851 nfs4_schedule_lease_recovery(clp);
3852 goto wait_on_recovery;
3853#if defined(CONFIG_NFS_V4_1)
3854 case -NFS4ERR_BADSESSION:
3855 case -NFS4ERR_BADSLOT:
3856 case -NFS4ERR_BAD_HIGH_SLOT:
3857 case -NFS4ERR_DEADSESSION:
3858 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3859 case -NFS4ERR_SEQ_FALSE_RETRY:
3860 case -NFS4ERR_SEQ_MISORDERED:
3861 dprintk("%s ERROR %d, Reset session\n", __func__,
3862 task->tk_status);
3863 nfs4_schedule_session_recovery(clp->cl_session);
3864 task->tk_status = 0;
3865 return -EAGAIN;
3866#endif /* CONFIG_NFS_V4_1 */
3867 case -NFS4ERR_DELAY:
3868 nfs_inc_server_stats(server, NFSIOS_DELAY);
3869 case -NFS4ERR_GRACE:
3870 case -EKEYEXPIRED:
3871 rpc_delay(task, NFS4_POLL_RETRY_MAX);
3872 task->tk_status = 0;
3873 return -EAGAIN;
3874 case -NFS4ERR_RETRY_UNCACHED_REP:
3875 case -NFS4ERR_OLD_STATEID:
3876 task->tk_status = 0;
3877 return -EAGAIN;
3878 }
3879 task->tk_status = nfs4_map_errors(task->tk_status);
3880 return 0;
3881wait_on_recovery:
3882 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3883 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3884 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3885 task->tk_status = 0;
3886 return -EAGAIN;
3887}
3888
3889static void nfs4_construct_boot_verifier(struct nfs_client *clp,
3890 nfs4_verifier *bootverf)
3891{
3892 __be32 verf[2];
3893
3894 verf[0] = htonl((u32)clp->cl_boot_time.tv_sec);
3895 verf[1] = htonl((u32)clp->cl_boot_time.tv_nsec);
3896 memcpy(bootverf->data, verf, sizeof(bootverf->data));
3897}
3898
3899int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3900 unsigned short port, struct rpc_cred *cred,
3901 struct nfs4_setclientid_res *res)
3902{
3903 nfs4_verifier sc_verifier;
3904 struct nfs4_setclientid setclientid = {
3905 .sc_verifier = &sc_verifier,
3906 .sc_prog = program,
3907 .sc_cb_ident = clp->cl_cb_ident,
3908 };
3909 struct rpc_message msg = {
3910 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3911 .rpc_argp = &setclientid,
3912 .rpc_resp = res,
3913 .rpc_cred = cred,
3914 };
3915 int loop = 0;
3916 int status;
3917
3918 nfs4_construct_boot_verifier(clp, &sc_verifier);
3919
3920 for(;;) {
3921 rcu_read_lock();
3922 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3923 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3924 clp->cl_ipaddr,
3925 rpc_peeraddr2str(clp->cl_rpcclient,
3926 RPC_DISPLAY_ADDR),
3927 rpc_peeraddr2str(clp->cl_rpcclient,
3928 RPC_DISPLAY_PROTO),
3929 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3930 clp->cl_id_uniquifier);
3931 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3932 sizeof(setclientid.sc_netid),
3933 rpc_peeraddr2str(clp->cl_rpcclient,
3934 RPC_DISPLAY_NETID));
3935 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3936 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3937 clp->cl_ipaddr, port >> 8, port & 255);
3938 rcu_read_unlock();
3939
3940 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3941 if (status != -NFS4ERR_CLID_INUSE)
3942 break;
3943 if (loop != 0) {
3944 ++clp->cl_id_uniquifier;
3945 break;
3946 }
3947 ++loop;
3948 ssleep(clp->cl_lease_time / HZ + 1);
3949 }
3950 return status;
3951}
3952
3953int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3954 struct nfs4_setclientid_res *arg,
3955 struct rpc_cred *cred)
3956{
3957 struct nfs_fsinfo fsinfo;
3958 struct rpc_message msg = {
3959 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3960 .rpc_argp = arg,
3961 .rpc_resp = &fsinfo,
3962 .rpc_cred = cred,
3963 };
3964 unsigned long now;
3965 int status;
3966
3967 now = jiffies;
3968 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3969 if (status == 0) {
3970 spin_lock(&clp->cl_lock);
3971 clp->cl_lease_time = fsinfo.lease_time * HZ;
3972 clp->cl_last_renewal = now;
3973 spin_unlock(&clp->cl_lock);
3974 }
3975 return status;
3976}
3977
3978struct nfs4_delegreturndata {
3979 struct nfs4_delegreturnargs args;
3980 struct nfs4_delegreturnres res;
3981 struct nfs_fh fh;
3982 nfs4_stateid stateid;
3983 unsigned long timestamp;
3984 struct nfs_fattr fattr;
3985 int rpc_status;
3986};
3987
3988static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3989{
3990 struct nfs4_delegreturndata *data = calldata;
3991
3992 if (!nfs4_sequence_done(task, &data->res.seq_res))
3993 return;
3994
3995 switch (task->tk_status) {
3996 case -NFS4ERR_STALE_STATEID:
3997 case -NFS4ERR_EXPIRED:
3998 case 0:
3999 renew_lease(data->res.server, data->timestamp);
4000 break;
4001 default:
4002 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4003 -EAGAIN) {
4004 rpc_restart_call_prepare(task);
4005 return;
4006 }
4007 }
4008 data->rpc_status = task->tk_status;
4009}
4010
4011static void nfs4_delegreturn_release(void *calldata)
4012{
4013 kfree(calldata);
4014}
4015
4016#if defined(CONFIG_NFS_V4_1)
4017static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4018{
4019 struct nfs4_delegreturndata *d_data;
4020
4021 d_data = (struct nfs4_delegreturndata *)data;
4022
4023 if (nfs4_setup_sequence(d_data->res.server,
4024 &d_data->args.seq_args,
4025 &d_data->res.seq_res, task))
4026 return;
4027 rpc_call_start(task);
4028}
4029#endif /* CONFIG_NFS_V4_1 */
4030
4031static const struct rpc_call_ops nfs4_delegreturn_ops = {
4032#if defined(CONFIG_NFS_V4_1)
4033 .rpc_call_prepare = nfs4_delegreturn_prepare,
4034#endif /* CONFIG_NFS_V4_1 */
4035 .rpc_call_done = nfs4_delegreturn_done,
4036 .rpc_release = nfs4_delegreturn_release,
4037};
4038
4039static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4040{
4041 struct nfs4_delegreturndata *data;
4042 struct nfs_server *server = NFS_SERVER(inode);
4043 struct rpc_task *task;
4044 struct rpc_message msg = {
4045 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4046 .rpc_cred = cred,
4047 };
4048 struct rpc_task_setup task_setup_data = {
4049 .rpc_client = server->client,
4050 .rpc_message = &msg,
4051 .callback_ops = &nfs4_delegreturn_ops,
4052 .flags = RPC_TASK_ASYNC,
4053 };
4054 int status = 0;
4055
4056 data = kzalloc(sizeof(*data), GFP_NOFS);
4057 if (data == NULL)
4058 return -ENOMEM;
4059 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4060 data->args.fhandle = &data->fh;
4061 data->args.stateid = &data->stateid;
4062 data->args.bitmask = server->attr_bitmask;
4063 nfs_copy_fh(&data->fh, NFS_FH(inode));
4064 nfs4_stateid_copy(&data->stateid, stateid);
4065 data->res.fattr = &data->fattr;
4066 data->res.server = server;
4067 nfs_fattr_init(data->res.fattr);
4068 data->timestamp = jiffies;
4069 data->rpc_status = 0;
4070
4071 task_setup_data.callback_data = data;
4072 msg.rpc_argp = &data->args;
4073 msg.rpc_resp = &data->res;
4074 task = rpc_run_task(&task_setup_data);
4075 if (IS_ERR(task))
4076 return PTR_ERR(task);
4077 if (!issync)
4078 goto out;
4079 status = nfs4_wait_for_completion_rpc_task(task);
4080 if (status != 0)
4081 goto out;
4082 status = data->rpc_status;
4083 if (status != 0)
4084 goto out;
4085 nfs_refresh_inode(inode, &data->fattr);
4086out:
4087 rpc_put_task(task);
4088 return status;
4089}
4090
4091int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4092{
4093 struct nfs_server *server = NFS_SERVER(inode);
4094 struct nfs4_exception exception = { };
4095 int err;
4096 do {
4097 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4098 switch (err) {
4099 case -NFS4ERR_STALE_STATEID:
4100 case -NFS4ERR_EXPIRED:
4101 case 0:
4102 return 0;
4103 }
4104 err = nfs4_handle_exception(server, err, &exception);
4105 } while (exception.retry);
4106 return err;
4107}
4108
4109#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4110#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4111
4112/*
4113 * sleep, with exponential backoff, and retry the LOCK operation.
4114 */
4115static unsigned long
4116nfs4_set_lock_task_retry(unsigned long timeout)
4117{
4118 freezable_schedule_timeout_killable(timeout);
4119 timeout <<= 1;
4120 if (timeout > NFS4_LOCK_MAXTIMEOUT)
4121 return NFS4_LOCK_MAXTIMEOUT;
4122 return timeout;
4123}
4124
4125static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4126{
4127 struct inode *inode = state->inode;
4128 struct nfs_server *server = NFS_SERVER(inode);
4129 struct nfs_client *clp = server->nfs_client;
4130 struct nfs_lockt_args arg = {
4131 .fh = NFS_FH(inode),
4132 .fl = request,
4133 };
4134 struct nfs_lockt_res res = {
4135 .denied = request,
4136 };
4137 struct rpc_message msg = {
4138 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4139 .rpc_argp = &arg,
4140 .rpc_resp = &res,
4141 .rpc_cred = state->owner->so_cred,
4142 };
4143 struct nfs4_lock_state *lsp;
4144 int status;
4145
4146 arg.lock_owner.clientid = clp->cl_clientid;
4147 status = nfs4_set_lock_state(state, request);
4148 if (status != 0)
4149 goto out;
4150 lsp = request->fl_u.nfs4_fl.owner;
4151 arg.lock_owner.id = lsp->ls_seqid.owner_id;
4152 arg.lock_owner.s_dev = server->s_dev;
4153 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4154 switch (status) {
4155 case 0:
4156 request->fl_type = F_UNLCK;
4157 break;
4158 case -NFS4ERR_DENIED:
4159 status = 0;
4160 }
4161 request->fl_ops->fl_release_private(request);
4162out:
4163 return status;
4164}
4165
4166static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4167{
4168 struct nfs4_exception exception = { };
4169 int err;
4170
4171 do {
4172 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4173 _nfs4_proc_getlk(state, cmd, request),
4174 &exception);
4175 } while (exception.retry);
4176 return err;
4177}
4178
4179static int do_vfs_lock(struct file *file, struct file_lock *fl)
4180{
4181 int res = 0;
4182 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4183 case FL_POSIX:
4184 res = posix_lock_file_wait(file, fl);
4185 break;
4186 case FL_FLOCK:
4187 res = flock_lock_file_wait(file, fl);
4188 break;
4189 default:
4190 BUG();
4191 }
4192 return res;
4193}
4194
4195struct nfs4_unlockdata {
4196 struct nfs_locku_args arg;
4197 struct nfs_locku_res res;
4198 struct nfs4_lock_state *lsp;
4199 struct nfs_open_context *ctx;
4200 struct file_lock fl;
4201 const struct nfs_server *server;
4202 unsigned long timestamp;
4203};
4204
4205static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4206 struct nfs_open_context *ctx,
4207 struct nfs4_lock_state *lsp,
4208 struct nfs_seqid *seqid)
4209{
4210 struct nfs4_unlockdata *p;
4211 struct inode *inode = lsp->ls_state->inode;
4212
4213 p = kzalloc(sizeof(*p), GFP_NOFS);
4214 if (p == NULL)
4215 return NULL;
4216 p->arg.fh = NFS_FH(inode);
4217 p->arg.fl = &p->fl;
4218 p->arg.seqid = seqid;
4219 p->res.seqid = seqid;
4220 p->arg.stateid = &lsp->ls_stateid;
4221 p->lsp = lsp;
4222 atomic_inc(&lsp->ls_count);
4223 /* Ensure we don't close file until we're done freeing locks! */
4224 p->ctx = get_nfs_open_context(ctx);
4225 memcpy(&p->fl, fl, sizeof(p->fl));
4226 p->server = NFS_SERVER(inode);
4227 return p;
4228}
4229
4230static void nfs4_locku_release_calldata(void *data)
4231{
4232 struct nfs4_unlockdata *calldata = data;
4233 nfs_free_seqid(calldata->arg.seqid);
4234 nfs4_put_lock_state(calldata->lsp);
4235 put_nfs_open_context(calldata->ctx);
4236 kfree(calldata);
4237}
4238
4239static void nfs4_locku_done(struct rpc_task *task, void *data)
4240{
4241 struct nfs4_unlockdata *calldata = data;
4242
4243 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4244 return;
4245 switch (task->tk_status) {
4246 case 0:
4247 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4248 &calldata->res.stateid);
4249 renew_lease(calldata->server, calldata->timestamp);
4250 break;
4251 case -NFS4ERR_BAD_STATEID:
4252 case -NFS4ERR_OLD_STATEID:
4253 case -NFS4ERR_STALE_STATEID:
4254 case -NFS4ERR_EXPIRED:
4255 break;
4256 default:
4257 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4258 rpc_restart_call_prepare(task);
4259 }
4260}
4261
4262static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4263{
4264 struct nfs4_unlockdata *calldata = data;
4265
4266 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4267 return;
4268 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4269 /* Note: exit _without_ running nfs4_locku_done */
4270 task->tk_action = NULL;
4271 return;
4272 }
4273 calldata->timestamp = jiffies;
4274 if (nfs4_setup_sequence(calldata->server,
4275 &calldata->arg.seq_args,
4276 &calldata->res.seq_res, task))
4277 return;
4278 rpc_call_start(task);
4279}
4280
4281static const struct rpc_call_ops nfs4_locku_ops = {
4282 .rpc_call_prepare = nfs4_locku_prepare,
4283 .rpc_call_done = nfs4_locku_done,
4284 .rpc_release = nfs4_locku_release_calldata,
4285};
4286
4287static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4288 struct nfs_open_context *ctx,
4289 struct nfs4_lock_state *lsp,
4290 struct nfs_seqid *seqid)
4291{
4292 struct nfs4_unlockdata *data;
4293 struct rpc_message msg = {
4294 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4295 .rpc_cred = ctx->cred,
4296 };
4297 struct rpc_task_setup task_setup_data = {
4298 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4299 .rpc_message = &msg,
4300 .callback_ops = &nfs4_locku_ops,
4301 .workqueue = nfsiod_workqueue,
4302 .flags = RPC_TASK_ASYNC,
4303 };
4304
4305 /* Ensure this is an unlock - when canceling a lock, the
4306 * canceled lock is passed in, and it won't be an unlock.
4307 */
4308 fl->fl_type = F_UNLCK;
4309
4310 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4311 if (data == NULL) {
4312 nfs_free_seqid(seqid);
4313 return ERR_PTR(-ENOMEM);
4314 }
4315
4316 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4317 msg.rpc_argp = &data->arg;
4318 msg.rpc_resp = &data->res;
4319 task_setup_data.callback_data = data;
4320 return rpc_run_task(&task_setup_data);
4321}
4322
4323static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4324{
4325 struct nfs_inode *nfsi = NFS_I(state->inode);
4326 struct nfs_seqid *seqid;
4327 struct nfs4_lock_state *lsp;
4328 struct rpc_task *task;
4329 int status = 0;
4330 unsigned char fl_flags = request->fl_flags;
4331
4332 status = nfs4_set_lock_state(state, request);
4333 /* Unlock _before_ we do the RPC call */
4334 request->fl_flags |= FL_EXISTS;
4335 down_read(&nfsi->rwsem);
4336 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4337 up_read(&nfsi->rwsem);
4338 goto out;
4339 }
4340 up_read(&nfsi->rwsem);
4341 if (status != 0)
4342 goto out;
4343 /* Is this a delegated lock? */
4344 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4345 goto out;
4346 lsp = request->fl_u.nfs4_fl.owner;
4347 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4348 status = -ENOMEM;
4349 if (seqid == NULL)
4350 goto out;
4351 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4352 status = PTR_ERR(task);
4353 if (IS_ERR(task))
4354 goto out;
4355 status = nfs4_wait_for_completion_rpc_task(task);
4356 rpc_put_task(task);
4357out:
4358 request->fl_flags = fl_flags;
4359 return status;
4360}
4361
4362struct nfs4_lockdata {
4363 struct nfs_lock_args arg;
4364 struct nfs_lock_res res;
4365 struct nfs4_lock_state *lsp;
4366 struct nfs_open_context *ctx;
4367 struct file_lock fl;
4368 unsigned long timestamp;
4369 int rpc_status;
4370 int cancelled;
4371 struct nfs_server *server;
4372};
4373
4374static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4375 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4376 gfp_t gfp_mask)
4377{
4378 struct nfs4_lockdata *p;
4379 struct inode *inode = lsp->ls_state->inode;
4380 struct nfs_server *server = NFS_SERVER(inode);
4381
4382 p = kzalloc(sizeof(*p), gfp_mask);
4383 if (p == NULL)
4384 return NULL;
4385
4386 p->arg.fh = NFS_FH(inode);
4387 p->arg.fl = &p->fl;
4388 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4389 if (p->arg.open_seqid == NULL)
4390 goto out_free;
4391 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4392 if (p->arg.lock_seqid == NULL)
4393 goto out_free_seqid;
4394 p->arg.lock_stateid = &lsp->ls_stateid;
4395 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4396 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4397 p->arg.lock_owner.s_dev = server->s_dev;
4398 p->res.lock_seqid = p->arg.lock_seqid;
4399 p->lsp = lsp;
4400 p->server = server;
4401 atomic_inc(&lsp->ls_count);
4402 p->ctx = get_nfs_open_context(ctx);
4403 memcpy(&p->fl, fl, sizeof(p->fl));
4404 return p;
4405out_free_seqid:
4406 nfs_free_seqid(p->arg.open_seqid);
4407out_free:
4408 kfree(p);
4409 return NULL;
4410}
4411
4412static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4413{
4414 struct nfs4_lockdata *data = calldata;
4415 struct nfs4_state *state = data->lsp->ls_state;
4416
4417 dprintk("%s: begin!\n", __func__);
4418 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4419 return;
4420 /* Do we need to do an open_to_lock_owner? */
4421 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4422 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4423 return;
4424 data->arg.open_stateid = &state->stateid;
4425 data->arg.new_lock_owner = 1;
4426 data->res.open_seqid = data->arg.open_seqid;
4427 } else
4428 data->arg.new_lock_owner = 0;
4429 data->timestamp = jiffies;
4430 if (nfs4_setup_sequence(data->server,
4431 &data->arg.seq_args,
4432 &data->res.seq_res, task))
4433 return;
4434 rpc_call_start(task);
4435 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4436}
4437
4438static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4439{
4440 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4441 nfs4_lock_prepare(task, calldata);
4442}
4443
4444static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4445{
4446 struct nfs4_lockdata *data = calldata;
4447
4448 dprintk("%s: begin!\n", __func__);
4449
4450 if (!nfs4_sequence_done(task, &data->res.seq_res))
4451 return;
4452
4453 data->rpc_status = task->tk_status;
4454 if (data->arg.new_lock_owner != 0) {
4455 if (data->rpc_status == 0)
4456 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4457 else
4458 goto out;
4459 }
4460 if (data->rpc_status == 0) {
4461 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4462 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4463 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4464 }
4465out:
4466 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4467}
4468
4469static void nfs4_lock_release(void *calldata)
4470{
4471 struct nfs4_lockdata *data = calldata;
4472
4473 dprintk("%s: begin!\n", __func__);
4474 nfs_free_seqid(data->arg.open_seqid);
4475 if (data->cancelled != 0) {
4476 struct rpc_task *task;
4477 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4478 data->arg.lock_seqid);
4479 if (!IS_ERR(task))
4480 rpc_put_task_async(task);
4481 dprintk("%s: cancelling lock!\n", __func__);
4482 } else
4483 nfs_free_seqid(data->arg.lock_seqid);
4484 nfs4_put_lock_state(data->lsp);
4485 put_nfs_open_context(data->ctx);
4486 kfree(data);
4487 dprintk("%s: done!\n", __func__);
4488}
4489
4490static const struct rpc_call_ops nfs4_lock_ops = {
4491 .rpc_call_prepare = nfs4_lock_prepare,
4492 .rpc_call_done = nfs4_lock_done,
4493 .rpc_release = nfs4_lock_release,
4494};
4495
4496static const struct rpc_call_ops nfs4_recover_lock_ops = {
4497 .rpc_call_prepare = nfs4_recover_lock_prepare,
4498 .rpc_call_done = nfs4_lock_done,
4499 .rpc_release = nfs4_lock_release,
4500};
4501
4502static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4503{
4504 switch (error) {
4505 case -NFS4ERR_ADMIN_REVOKED:
4506 case -NFS4ERR_BAD_STATEID:
4507 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4508 if (new_lock_owner != 0 ||
4509 (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4510 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4511 break;
4512 case -NFS4ERR_STALE_STATEID:
4513 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4514 case -NFS4ERR_EXPIRED:
4515 nfs4_schedule_lease_recovery(server->nfs_client);
4516 };
4517}
4518
4519static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4520{
4521 struct nfs4_lockdata *data;
4522 struct rpc_task *task;
4523 struct rpc_message msg = {
4524 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4525 .rpc_cred = state->owner->so_cred,
4526 };
4527 struct rpc_task_setup task_setup_data = {
4528 .rpc_client = NFS_CLIENT(state->inode),
4529 .rpc_message = &msg,
4530 .callback_ops = &nfs4_lock_ops,
4531 .workqueue = nfsiod_workqueue,
4532 .flags = RPC_TASK_ASYNC,
4533 };
4534 int ret;
4535
4536 dprintk("%s: begin!\n", __func__);
4537 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4538 fl->fl_u.nfs4_fl.owner,
4539 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4540 if (data == NULL)
4541 return -ENOMEM;
4542 if (IS_SETLKW(cmd))
4543 data->arg.block = 1;
4544 if (recovery_type > NFS_LOCK_NEW) {
4545 if (recovery_type == NFS_LOCK_RECLAIM)
4546 data->arg.reclaim = NFS_LOCK_RECLAIM;
4547 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4548 }
4549 nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4550 msg.rpc_argp = &data->arg;
4551 msg.rpc_resp = &data->res;
4552 task_setup_data.callback_data = data;
4553 task = rpc_run_task(&task_setup_data);
4554 if (IS_ERR(task))
4555 return PTR_ERR(task);
4556 ret = nfs4_wait_for_completion_rpc_task(task);
4557 if (ret == 0) {
4558 ret = data->rpc_status;
4559 if (ret)
4560 nfs4_handle_setlk_error(data->server, data->lsp,
4561 data->arg.new_lock_owner, ret);
4562 } else
4563 data->cancelled = 1;
4564 rpc_put_task(task);
4565 dprintk("%s: done, ret = %d!\n", __func__, ret);
4566 return ret;
4567}
4568
4569static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4570{
4571 struct nfs_server *server = NFS_SERVER(state->inode);
4572 struct nfs4_exception exception = {
4573 .inode = state->inode,
4574 };
4575 int err;
4576
4577 do {
4578 /* Cache the lock if possible... */
4579 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4580 return 0;
4581 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4582 if (err != -NFS4ERR_DELAY)
4583 break;
4584 nfs4_handle_exception(server, err, &exception);
4585 } while (exception.retry);
4586 return err;
4587}
4588
4589static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4590{
4591 struct nfs_server *server = NFS_SERVER(state->inode);
4592 struct nfs4_exception exception = {
4593 .inode = state->inode,
4594 };
4595 int err;
4596
4597 err = nfs4_set_lock_state(state, request);
4598 if (err != 0)
4599 return err;
4600 do {
4601 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4602 return 0;
4603 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4604 switch (err) {
4605 default:
4606 goto out;
4607 case -NFS4ERR_GRACE:
4608 case -NFS4ERR_DELAY:
4609 nfs4_handle_exception(server, err, &exception);
4610 err = 0;
4611 }
4612 } while (exception.retry);
4613out:
4614 return err;
4615}
4616
4617#if defined(CONFIG_NFS_V4_1)
4618static int nfs41_check_expired_locks(struct nfs4_state *state)
4619{
4620 int status, ret = NFS_OK;
4621 struct nfs4_lock_state *lsp;
4622 struct nfs_server *server = NFS_SERVER(state->inode);
4623
4624 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4625 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4626 status = nfs41_test_stateid(server, &lsp->ls_stateid);
4627 if (status != NFS_OK) {
4628 nfs41_free_stateid(server, &lsp->ls_stateid);
4629 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4630 ret = status;
4631 }
4632 }
4633 };
4634
4635 return ret;
4636}
4637
4638static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4639{
4640 int status = NFS_OK;
4641
4642 if (test_bit(LK_STATE_IN_USE, &state->flags))
4643 status = nfs41_check_expired_locks(state);
4644 if (status == NFS_OK)
4645 return status;
4646 return nfs4_lock_expired(state, request);
4647}
4648#endif
4649
4650static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4651{
4652 struct nfs_inode *nfsi = NFS_I(state->inode);
4653 unsigned char fl_flags = request->fl_flags;
4654 int status = -ENOLCK;
4655
4656 if ((fl_flags & FL_POSIX) &&
4657 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4658 goto out;
4659 /* Is this a delegated open? */
4660 status = nfs4_set_lock_state(state, request);
4661 if (status != 0)
4662 goto out;
4663 request->fl_flags |= FL_ACCESS;
4664 status = do_vfs_lock(request->fl_file, request);
4665 if (status < 0)
4666 goto out;
4667 down_read(&nfsi->rwsem);
4668 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4669 /* Yes: cache locks! */
4670 /* ...but avoid races with delegation recall... */
4671 request->fl_flags = fl_flags & ~FL_SLEEP;
4672 status = do_vfs_lock(request->fl_file, request);
4673 goto out_unlock;
4674 }
4675 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4676 if (status != 0)
4677 goto out_unlock;
4678 /* Note: we always want to sleep here! */
4679 request->fl_flags = fl_flags | FL_SLEEP;
4680 if (do_vfs_lock(request->fl_file, request) < 0)
4681 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4682 "manager!\n", __func__);
4683out_unlock:
4684 up_read(&nfsi->rwsem);
4685out:
4686 request->fl_flags = fl_flags;
4687 return status;
4688}
4689
4690static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4691{
4692 struct nfs4_exception exception = {
4693 .state = state,
4694 .inode = state->inode,
4695 };
4696 int err;
4697
4698 do {
4699 err = _nfs4_proc_setlk(state, cmd, request);
4700 if (err == -NFS4ERR_DENIED)
4701 err = -EAGAIN;
4702 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4703 err, &exception);
4704 } while (exception.retry);
4705 return err;
4706}
4707
4708static int
4709nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4710{
4711 struct nfs_open_context *ctx;
4712 struct nfs4_state *state;
4713 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4714 int status;
4715
4716 /* verify open state */
4717 ctx = nfs_file_open_context(filp);
4718 state = ctx->state;
4719
4720 if (request->fl_start < 0 || request->fl_end < 0)
4721 return -EINVAL;
4722
4723 if (IS_GETLK(cmd)) {
4724 if (state != NULL)
4725 return nfs4_proc_getlk(state, F_GETLK, request);
4726 return 0;
4727 }
4728
4729 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4730 return -EINVAL;
4731
4732 if (request->fl_type == F_UNLCK) {
4733 if (state != NULL)
4734 return nfs4_proc_unlck(state, cmd, request);
4735 return 0;
4736 }
4737
4738 if (state == NULL)
4739 return -ENOLCK;
4740 /*
4741 * Don't rely on the VFS having checked the file open mode,
4742 * since it won't do this for flock() locks.
4743 */
4744 switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4745 case F_RDLCK:
4746 if (!(filp->f_mode & FMODE_READ))
4747 return -EBADF;
4748 break;
4749 case F_WRLCK:
4750 if (!(filp->f_mode & FMODE_WRITE))
4751 return -EBADF;
4752 }
4753
4754 do {
4755 status = nfs4_proc_setlk(state, cmd, request);
4756 if ((status != -EAGAIN) || IS_SETLK(cmd))
4757 break;
4758 timeout = nfs4_set_lock_task_retry(timeout);
4759 status = -ERESTARTSYS;
4760 if (signalled())
4761 break;
4762 } while(status < 0);
4763 return status;
4764}
4765
4766int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4767{
4768 struct nfs_server *server = NFS_SERVER(state->inode);
4769 struct nfs4_exception exception = { };
4770 int err;
4771
4772 err = nfs4_set_lock_state(state, fl);
4773 if (err != 0)
4774 goto out;
4775 do {
4776 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4777 switch (err) {
4778 default:
4779 printk(KERN_ERR "NFS: %s: unhandled error "
4780 "%d.\n", __func__, err);
4781 case 0:
4782 case -ESTALE:
4783 goto out;
4784 case -NFS4ERR_EXPIRED:
4785 nfs4_schedule_stateid_recovery(server, state);
4786 case -NFS4ERR_STALE_CLIENTID:
4787 case -NFS4ERR_STALE_STATEID:
4788 nfs4_schedule_lease_recovery(server->nfs_client);
4789 goto out;
4790 case -NFS4ERR_BADSESSION:
4791 case -NFS4ERR_BADSLOT:
4792 case -NFS4ERR_BAD_HIGH_SLOT:
4793 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4794 case -NFS4ERR_DEADSESSION:
4795 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4796 goto out;
4797 case -ERESTARTSYS:
4798 /*
4799 * The show must go on: exit, but mark the
4800 * stateid as needing recovery.
4801 */
4802 case -NFS4ERR_DELEG_REVOKED:
4803 case -NFS4ERR_ADMIN_REVOKED:
4804 case -NFS4ERR_BAD_STATEID:
4805 case -NFS4ERR_OPENMODE:
4806 nfs4_schedule_stateid_recovery(server, state);
4807 err = 0;
4808 goto out;
4809 case -EKEYEXPIRED:
4810 /*
4811 * User RPCSEC_GSS context has expired.
4812 * We cannot recover this stateid now, so
4813 * skip it and allow recovery thread to
4814 * proceed.
4815 */
4816 err = 0;
4817 goto out;
4818 case -ENOMEM:
4819 case -NFS4ERR_DENIED:
4820 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4821 err = 0;
4822 goto out;
4823 case -NFS4ERR_DELAY:
4824 break;
4825 }
4826 err = nfs4_handle_exception(server, err, &exception);
4827 } while (exception.retry);
4828out:
4829 return err;
4830}
4831
4832struct nfs_release_lockowner_data {
4833 struct nfs4_lock_state *lsp;
4834 struct nfs_server *server;
4835 struct nfs_release_lockowner_args args;
4836};
4837
4838static void nfs4_release_lockowner_release(void *calldata)
4839{
4840 struct nfs_release_lockowner_data *data = calldata;
4841 nfs4_free_lock_state(data->server, data->lsp);
4842 kfree(calldata);
4843}
4844
4845static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4846 .rpc_release = nfs4_release_lockowner_release,
4847};
4848
4849int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4850{
4851 struct nfs_server *server = lsp->ls_state->owner->so_server;
4852 struct nfs_release_lockowner_data *data;
4853 struct rpc_message msg = {
4854 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4855 };
4856
4857 if (server->nfs_client->cl_mvops->minor_version != 0)
4858 return -EINVAL;
4859 data = kmalloc(sizeof(*data), GFP_NOFS);
4860 if (!data)
4861 return -ENOMEM;
4862 data->lsp = lsp;
4863 data->server = server;
4864 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4865 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4866 data->args.lock_owner.s_dev = server->s_dev;
4867 msg.rpc_argp = &data->args;
4868 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4869 return 0;
4870}
4871
4872#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4873
4874static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4875 const void *buf, size_t buflen,
4876 int flags, int type)
4877{
4878 if (strcmp(key, "") != 0)
4879 return -EINVAL;
4880
4881 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4882}
4883
4884static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4885 void *buf, size_t buflen, int type)
4886{
4887 if (strcmp(key, "") != 0)
4888 return -EINVAL;
4889
4890 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4891}
4892
4893static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4894 size_t list_len, const char *name,
4895 size_t name_len, int type)
4896{
4897 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4898
4899 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4900 return 0;
4901
4902 if (list && len <= list_len)
4903 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4904 return len;
4905}
4906
4907/*
4908 * nfs_fhget will use either the mounted_on_fileid or the fileid
4909 */
4910static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4911{
4912 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4913 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4914 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4915 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4916 return;
4917
4918 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4919 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4920 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4921 fattr->nlink = 2;
4922}
4923
4924int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4925 struct nfs4_fs_locations *fs_locations, struct page *page)
4926{
4927 struct nfs_server *server = NFS_SERVER(dir);
4928 u32 bitmask[2] = {
4929 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4930 };
4931 struct nfs4_fs_locations_arg args = {
4932 .dir_fh = NFS_FH(dir),
4933 .name = name,
4934 .page = page,
4935 .bitmask = bitmask,
4936 };
4937 struct nfs4_fs_locations_res res = {
4938 .fs_locations = fs_locations,
4939 };
4940 struct rpc_message msg = {
4941 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4942 .rpc_argp = &args,
4943 .rpc_resp = &res,
4944 };
4945 int status;
4946
4947 dprintk("%s: start\n", __func__);
4948
4949 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4950 * is not supported */
4951 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4952 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4953 else
4954 bitmask[0] |= FATTR4_WORD0_FILEID;
4955
4956 nfs_fattr_init(&fs_locations->fattr);
4957 fs_locations->server = server;
4958 fs_locations->nlocations = 0;
4959 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4960 dprintk("%s: returned status = %d\n", __func__, status);
4961 return status;
4962}
4963
4964static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4965{
4966 int status;
4967 struct nfs4_secinfo_arg args = {
4968 .dir_fh = NFS_FH(dir),
4969 .name = name,
4970 };
4971 struct nfs4_secinfo_res res = {
4972 .flavors = flavors,
4973 };
4974 struct rpc_message msg = {
4975 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4976 .rpc_argp = &args,
4977 .rpc_resp = &res,
4978 };
4979
4980 dprintk("NFS call secinfo %s\n", name->name);
4981 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4982 dprintk("NFS reply secinfo: %d\n", status);
4983 return status;
4984}
4985
4986static int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
4987 struct nfs4_secinfo_flavors *flavors)
4988{
4989 struct nfs4_exception exception = { };
4990 int err;
4991 do {
4992 err = nfs4_handle_exception(NFS_SERVER(dir),
4993 _nfs4_proc_secinfo(dir, name, flavors),
4994 &exception);
4995 } while (exception.retry);
4996 return err;
4997}
4998
4999#ifdef CONFIG_NFS_V4_1
5000/*
5001 * Check the exchange flags returned by the server for invalid flags, having
5002 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5003 * DS flags set.
5004 */
5005static int nfs4_check_cl_exchange_flags(u32 flags)
5006{
5007 if (flags & ~EXCHGID4_FLAG_MASK_R)
5008 goto out_inval;
5009 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5010 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5011 goto out_inval;
5012 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5013 goto out_inval;
5014 return NFS_OK;
5015out_inval:
5016 return -NFS4ERR_INVAL;
5017}
5018
5019static bool
5020nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
5021{
5022 if (a->server_scope_sz == b->server_scope_sz &&
5023 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5024 return true;
5025
5026 return false;
5027}
5028
5029/*
5030 * nfs4_proc_exchange_id()
5031 *
5032 * Since the clientid has expired, all compounds using sessions
5033 * associated with the stale clientid will be returning
5034 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5035 * be in some phase of session reset.
5036 */
5037int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5038{
5039 nfs4_verifier verifier;
5040 struct nfs41_exchange_id_args args = {
5041 .verifier = &verifier,
5042 .client = clp,
5043 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5044 };
5045 struct nfs41_exchange_id_res res = {
5046 .client = clp,
5047 };
5048 int status;
5049 struct rpc_message msg = {
5050 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5051 .rpc_argp = &args,
5052 .rpc_resp = &res,
5053 .rpc_cred = cred,
5054 };
5055
5056 dprintk("--> %s\n", __func__);
5057 BUG_ON(clp == NULL);
5058
5059 nfs4_construct_boot_verifier(clp, &verifier);
5060
5061 args.id_len = scnprintf(args.id, sizeof(args.id),
5062 "%s/%s.%s/%u",
5063 clp->cl_ipaddr,
5064 init_utsname()->nodename,
5065 init_utsname()->domainname,
5066 clp->cl_rpcclient->cl_auth->au_flavor);
5067
5068 res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
5069 if (unlikely(!res.server_scope)) {
5070 status = -ENOMEM;
5071 goto out;
5072 }
5073
5074 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5075 if (unlikely(!res.impl_id)) {
5076 status = -ENOMEM;
5077 goto out_server_scope;
5078 }
5079
5080 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5081 if (!status)
5082 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5083
5084 if (!status) {
5085 /* use the most recent implementation id */
5086 kfree(clp->impl_id);
5087 clp->impl_id = res.impl_id;
5088 } else
5089 kfree(res.impl_id);
5090
5091 if (!status) {
5092 if (clp->server_scope &&
5093 !nfs41_same_server_scope(clp->server_scope,
5094 res.server_scope)) {
5095 dprintk("%s: server_scope mismatch detected\n",
5096 __func__);
5097 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5098 kfree(clp->server_scope);
5099 clp->server_scope = NULL;
5100 }
5101
5102 if (!clp->server_scope) {
5103 clp->server_scope = res.server_scope;
5104 goto out;
5105 }
5106 }
5107
5108out_server_scope:
5109 kfree(res.server_scope);
5110out:
5111 if (clp->impl_id)
5112 dprintk("%s: Server Implementation ID: "
5113 "domain: %s, name: %s, date: %llu,%u\n",
5114 __func__, clp->impl_id->domain, clp->impl_id->name,
5115 clp->impl_id->date.seconds,
5116 clp->impl_id->date.nseconds);
5117 dprintk("<-- %s status= %d\n", __func__, status);
5118 return status;
5119}
5120
5121struct nfs4_get_lease_time_data {
5122 struct nfs4_get_lease_time_args *args;
5123 struct nfs4_get_lease_time_res *res;
5124 struct nfs_client *clp;
5125};
5126
5127static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5128 void *calldata)
5129{
5130 int ret;
5131 struct nfs4_get_lease_time_data *data =
5132 (struct nfs4_get_lease_time_data *)calldata;
5133
5134 dprintk("--> %s\n", __func__);
5135 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5136 /* just setup sequence, do not trigger session recovery
5137 since we're invoked within one */
5138 ret = nfs41_setup_sequence(data->clp->cl_session,
5139 &data->args->la_seq_args,
5140 &data->res->lr_seq_res, task);
5141
5142 BUG_ON(ret == -EAGAIN);
5143 rpc_call_start(task);
5144 dprintk("<-- %s\n", __func__);
5145}
5146
5147/*
5148 * Called from nfs4_state_manager thread for session setup, so don't recover
5149 * from sequence operation or clientid errors.
5150 */
5151static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5152{
5153 struct nfs4_get_lease_time_data *data =
5154 (struct nfs4_get_lease_time_data *)calldata;
5155
5156 dprintk("--> %s\n", __func__);
5157 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5158 return;
5159 switch (task->tk_status) {
5160 case -NFS4ERR_DELAY:
5161 case -NFS4ERR_GRACE:
5162 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5163 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5164 task->tk_status = 0;
5165 /* fall through */
5166 case -NFS4ERR_RETRY_UNCACHED_REP:
5167 rpc_restart_call_prepare(task);
5168 return;
5169 }
5170 dprintk("<-- %s\n", __func__);
5171}
5172
5173static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5174 .rpc_call_prepare = nfs4_get_lease_time_prepare,
5175 .rpc_call_done = nfs4_get_lease_time_done,
5176};
5177
5178int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5179{
5180 struct rpc_task *task;
5181 struct nfs4_get_lease_time_args args;
5182 struct nfs4_get_lease_time_res res = {
5183 .lr_fsinfo = fsinfo,
5184 };
5185 struct nfs4_get_lease_time_data data = {
5186 .args = &args,
5187 .res = &res,
5188 .clp = clp,
5189 };
5190 struct rpc_message msg = {
5191 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5192 .rpc_argp = &args,
5193 .rpc_resp = &res,
5194 };
5195 struct rpc_task_setup task_setup = {
5196 .rpc_client = clp->cl_rpcclient,
5197 .rpc_message = &msg,
5198 .callback_ops = &nfs4_get_lease_time_ops,
5199 .callback_data = &data,
5200 .flags = RPC_TASK_TIMEOUT,
5201 };
5202 int status;
5203
5204 nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5205 dprintk("--> %s\n", __func__);
5206 task = rpc_run_task(&task_setup);
5207
5208 if (IS_ERR(task))
5209 status = PTR_ERR(task);
5210 else {
5211 status = task->tk_status;
5212 rpc_put_task(task);
5213 }
5214 dprintk("<-- %s return %d\n", __func__, status);
5215
5216 return status;
5217}
5218
5219static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5220{
5221 return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5222}
5223
5224static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5225 struct nfs4_slot *new,
5226 u32 max_slots,
5227 u32 ivalue)
5228{
5229 struct nfs4_slot *old = NULL;
5230 u32 i;
5231
5232 spin_lock(&tbl->slot_tbl_lock);
5233 if (new) {
5234 old = tbl->slots;
5235 tbl->slots = new;
5236 tbl->max_slots = max_slots;
5237 }
5238 tbl->highest_used_slotid = -1; /* no slot is currently used */
5239 for (i = 0; i < tbl->max_slots; i++)
5240 tbl->slots[i].seq_nr = ivalue;
5241 spin_unlock(&tbl->slot_tbl_lock);
5242 kfree(old);
5243}
5244
5245/*
5246 * (re)Initialise a slot table
5247 */
5248static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5249 u32 ivalue)
5250{
5251 struct nfs4_slot *new = NULL;
5252 int ret = -ENOMEM;
5253
5254 dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5255 max_reqs, tbl->max_slots);
5256
5257 /* Does the newly negotiated max_reqs match the existing slot table? */
5258 if (max_reqs != tbl->max_slots) {
5259 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5260 if (!new)
5261 goto out;
5262 }
5263 ret = 0;
5264
5265 nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5266 dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5267 tbl, tbl->slots, tbl->max_slots);
5268out:
5269 dprintk("<-- %s: return %d\n", __func__, ret);
5270 return ret;
5271}
5272
5273/* Destroy the slot table */
5274static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5275{
5276 if (session->fc_slot_table.slots != NULL) {
5277 kfree(session->fc_slot_table.slots);
5278 session->fc_slot_table.slots = NULL;
5279 }
5280 if (session->bc_slot_table.slots != NULL) {
5281 kfree(session->bc_slot_table.slots);
5282 session->bc_slot_table.slots = NULL;
5283 }
5284 return;
5285}
5286
5287/*
5288 * Initialize or reset the forechannel and backchannel tables
5289 */
5290static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5291{
5292 struct nfs4_slot_table *tbl;
5293 int status;
5294
5295 dprintk("--> %s\n", __func__);
5296 /* Fore channel */
5297 tbl = &ses->fc_slot_table;
5298 status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5299 if (status) /* -ENOMEM */
5300 return status;
5301 /* Back channel */
5302 tbl = &ses->bc_slot_table;
5303 status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5304 if (status && tbl->slots == NULL)
5305 /* Fore and back channel share a connection so get
5306 * both slot tables or neither */
5307 nfs4_destroy_slot_tables(ses);
5308 return status;
5309}
5310
5311struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5312{
5313 struct nfs4_session *session;
5314 struct nfs4_slot_table *tbl;
5315
5316 session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5317 if (!session)
5318 return NULL;
5319
5320 tbl = &session->fc_slot_table;
5321 tbl->highest_used_slotid = NFS4_NO_SLOT;
5322 spin_lock_init(&tbl->slot_tbl_lock);
5323 rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5324 init_completion(&tbl->complete);
5325
5326 tbl = &session->bc_slot_table;
5327 tbl->highest_used_slotid = NFS4_NO_SLOT;
5328 spin_lock_init(&tbl->slot_tbl_lock);
5329 rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5330 init_completion(&tbl->complete);
5331
5332 session->session_state = 1<<NFS4_SESSION_INITING;
5333
5334 session->clp = clp;
5335 return session;
5336}
5337
5338void nfs4_destroy_session(struct nfs4_session *session)
5339{
5340 struct rpc_xprt *xprt;
5341
5342 nfs4_proc_destroy_session(session);
5343
5344 rcu_read_lock();
5345 xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5346 rcu_read_unlock();
5347 dprintk("%s Destroy backchannel for xprt %p\n",
5348 __func__, xprt);
5349 xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5350 nfs4_destroy_slot_tables(session);
5351 kfree(session);
5352}
5353
5354/*
5355 * Initialize the values to be used by the client in CREATE_SESSION
5356 * If nfs4_init_session set the fore channel request and response sizes,
5357 * use them.
5358 *
5359 * Set the back channel max_resp_sz_cached to zero to force the client to
5360 * always set csa_cachethis to FALSE because the current implementation
5361 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5362 */
5363static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5364{
5365 struct nfs4_session *session = args->client->cl_session;
5366 unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5367 mxresp_sz = session->fc_attrs.max_resp_sz;
5368
5369 if (mxrqst_sz == 0)
5370 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5371 if (mxresp_sz == 0)
5372 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5373 /* Fore channel attributes */
5374 args->fc_attrs.max_rqst_sz = mxrqst_sz;
5375 args->fc_attrs.max_resp_sz = mxresp_sz;
5376 args->fc_attrs.max_ops = NFS4_MAX_OPS;
5377 args->fc_attrs.max_reqs = max_session_slots;
5378
5379 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5380 "max_ops=%u max_reqs=%u\n",
5381 __func__,
5382 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5383 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5384
5385 /* Back channel attributes */
5386 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5387 args->bc_attrs.max_resp_sz = PAGE_SIZE;
5388 args->bc_attrs.max_resp_sz_cached = 0;
5389 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5390 args->bc_attrs.max_reqs = 1;
5391
5392 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5393 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5394 __func__,
5395 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5396 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5397 args->bc_attrs.max_reqs);
5398}
5399
5400static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5401{
5402 struct nfs4_channel_attrs *sent = &args->fc_attrs;
5403 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5404
5405 if (rcvd->max_resp_sz > sent->max_resp_sz)
5406 return -EINVAL;
5407 /*
5408 * Our requested max_ops is the minimum we need; we're not
5409 * prepared to break up compounds into smaller pieces than that.
5410 * So, no point even trying to continue if the server won't
5411 * cooperate:
5412 */
5413 if (rcvd->max_ops < sent->max_ops)
5414 return -EINVAL;
5415 if (rcvd->max_reqs == 0)
5416 return -EINVAL;
5417 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5418 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5419 return 0;
5420}
5421
5422static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5423{
5424 struct nfs4_channel_attrs *sent = &args->bc_attrs;
5425 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5426
5427 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5428 return -EINVAL;
5429 if (rcvd->max_resp_sz < sent->max_resp_sz)
5430 return -EINVAL;
5431 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5432 return -EINVAL;
5433 /* These would render the backchannel useless: */
5434 if (rcvd->max_ops != sent->max_ops)
5435 return -EINVAL;
5436 if (rcvd->max_reqs != sent->max_reqs)
5437 return -EINVAL;
5438 return 0;
5439}
5440
5441static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5442 struct nfs4_session *session)
5443{
5444 int ret;
5445
5446 ret = nfs4_verify_fore_channel_attrs(args, session);
5447 if (ret)
5448 return ret;
5449 return nfs4_verify_back_channel_attrs(args, session);
5450}
5451
5452static int _nfs4_proc_create_session(struct nfs_client *clp)
5453{
5454 struct nfs4_session *session = clp->cl_session;
5455 struct nfs41_create_session_args args = {
5456 .client = clp,
5457 .cb_program = NFS4_CALLBACK,
5458 };
5459 struct nfs41_create_session_res res = {
5460 .client = clp,
5461 };
5462 struct rpc_message msg = {
5463 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5464 .rpc_argp = &args,
5465 .rpc_resp = &res,
5466 };
5467 int status;
5468
5469 nfs4_init_channel_attrs(&args);
5470 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5471
5472 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5473
5474 if (!status)
5475 /* Verify the session's negotiated channel_attrs values */
5476 status = nfs4_verify_channel_attrs(&args, session);
5477 if (!status) {
5478 /* Increment the clientid slot sequence id */
5479 clp->cl_seqid++;
5480 }
5481
5482 return status;
5483}
5484
5485/*
5486 * Issues a CREATE_SESSION operation to the server.
5487 * It is the responsibility of the caller to verify the session is
5488 * expired before calling this routine.
5489 */
5490int nfs4_proc_create_session(struct nfs_client *clp)
5491{
5492 int status;
5493 unsigned *ptr;
5494 struct nfs4_session *session = clp->cl_session;
5495
5496 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5497
5498 status = _nfs4_proc_create_session(clp);
5499 if (status)
5500 goto out;
5501
5502 /* Init or reset the session slot tables */
5503 status = nfs4_setup_session_slot_tables(session);
5504 dprintk("slot table setup returned %d\n", status);
5505 if (status)
5506 goto out;
5507
5508 ptr = (unsigned *)&session->sess_id.data[0];
5509 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5510 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5511out:
5512 dprintk("<-- %s\n", __func__);
5513 return status;
5514}
5515
5516/*
5517 * Issue the over-the-wire RPC DESTROY_SESSION.
5518 * The caller must serialize access to this routine.
5519 */
5520int nfs4_proc_destroy_session(struct nfs4_session *session)
5521{
5522 int status = 0;
5523 struct rpc_message msg;
5524
5525 dprintk("--> nfs4_proc_destroy_session\n");
5526
5527 /* session is still being setup */
5528 if (session->clp->cl_cons_state != NFS_CS_READY)
5529 return status;
5530
5531 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5532 msg.rpc_argp = session;
5533 msg.rpc_resp = NULL;
5534 msg.rpc_cred = NULL;
5535 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5536
5537 if (status)
5538 printk(KERN_WARNING
5539 "NFS: Got error %d from the server on DESTROY_SESSION. "
5540 "Session has been destroyed regardless...\n", status);
5541
5542 dprintk("<-- nfs4_proc_destroy_session\n");
5543 return status;
5544}
5545
5546int nfs4_init_session(struct nfs_server *server)
5547{
5548 struct nfs_client *clp = server->nfs_client;
5549 struct nfs4_session *session;
5550 unsigned int rsize, wsize;
5551 int ret;
5552
5553 if (!nfs4_has_session(clp))
5554 return 0;
5555
5556 session = clp->cl_session;
5557 if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5558 return 0;
5559
5560 rsize = server->rsize;
5561 if (rsize == 0)
5562 rsize = NFS_MAX_FILE_IO_SIZE;
5563 wsize = server->wsize;
5564 if (wsize == 0)
5565 wsize = NFS_MAX_FILE_IO_SIZE;
5566
5567 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5568 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5569
5570 ret = nfs4_recover_expired_lease(server);
5571 if (!ret)
5572 ret = nfs4_check_client_ready(clp);
5573 return ret;
5574}
5575
5576int nfs4_init_ds_session(struct nfs_client *clp)
5577{
5578 struct nfs4_session *session = clp->cl_session;
5579 int ret;
5580
5581 if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5582 return 0;
5583
5584 ret = nfs4_client_recover_expired_lease(clp);
5585 if (!ret)
5586 /* Test for the DS role */
5587 if (!is_ds_client(clp))
5588 ret = -ENODEV;
5589 if (!ret)
5590 ret = nfs4_check_client_ready(clp);
5591 return ret;
5592
5593}
5594EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5595
5596
5597/*
5598 * Renew the cl_session lease.
5599 */
5600struct nfs4_sequence_data {
5601 struct nfs_client *clp;
5602 struct nfs4_sequence_args args;
5603 struct nfs4_sequence_res res;
5604};
5605
5606static void nfs41_sequence_release(void *data)
5607{
5608 struct nfs4_sequence_data *calldata = data;
5609 struct nfs_client *clp = calldata->clp;
5610
5611 if (atomic_read(&clp->cl_count) > 1)
5612 nfs4_schedule_state_renewal(clp);
5613 nfs_put_client(clp);
5614 kfree(calldata);
5615}
5616
5617static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5618{
5619 switch(task->tk_status) {
5620 case -NFS4ERR_DELAY:
5621 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5622 return -EAGAIN;
5623 default:
5624 nfs4_schedule_lease_recovery(clp);
5625 }
5626 return 0;
5627}
5628
5629static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5630{
5631 struct nfs4_sequence_data *calldata = data;
5632 struct nfs_client *clp = calldata->clp;
5633
5634 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5635 return;
5636
5637 if (task->tk_status < 0) {
5638 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5639 if (atomic_read(&clp->cl_count) == 1)
5640 goto out;
5641
5642 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5643 rpc_restart_call_prepare(task);
5644 return;
5645 }
5646 }
5647 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5648out:
5649 dprintk("<-- %s\n", __func__);
5650}
5651
5652static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5653{
5654 struct nfs4_sequence_data *calldata = data;
5655 struct nfs_client *clp = calldata->clp;
5656 struct nfs4_sequence_args *args;
5657 struct nfs4_sequence_res *res;
5658
5659 args = task->tk_msg.rpc_argp;
5660 res = task->tk_msg.rpc_resp;
5661
5662 if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5663 return;
5664 rpc_call_start(task);
5665}
5666
5667static const struct rpc_call_ops nfs41_sequence_ops = {
5668 .rpc_call_done = nfs41_sequence_call_done,
5669 .rpc_call_prepare = nfs41_sequence_prepare,
5670 .rpc_release = nfs41_sequence_release,
5671};
5672
5673static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5674{
5675 struct nfs4_sequence_data *calldata;
5676 struct rpc_message msg = {
5677 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5678 .rpc_cred = cred,
5679 };
5680 struct rpc_task_setup task_setup_data = {
5681 .rpc_client = clp->cl_rpcclient,
5682 .rpc_message = &msg,
5683 .callback_ops = &nfs41_sequence_ops,
5684 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5685 };
5686
5687 if (!atomic_inc_not_zero(&clp->cl_count))
5688 return ERR_PTR(-EIO);
5689 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5690 if (calldata == NULL) {
5691 nfs_put_client(clp);
5692 return ERR_PTR(-ENOMEM);
5693 }
5694 nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5695 msg.rpc_argp = &calldata->args;
5696 msg.rpc_resp = &calldata->res;
5697 calldata->clp = clp;
5698 task_setup_data.callback_data = calldata;
5699
5700 return rpc_run_task(&task_setup_data);
5701}
5702
5703static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5704{
5705 struct rpc_task *task;
5706 int ret = 0;
5707
5708 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5709 return 0;
5710 task = _nfs41_proc_sequence(clp, cred);
5711 if (IS_ERR(task))
5712 ret = PTR_ERR(task);
5713 else
5714 rpc_put_task_async(task);
5715 dprintk("<-- %s status=%d\n", __func__, ret);
5716 return ret;
5717}
5718
5719static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5720{
5721 struct rpc_task *task;
5722 int ret;
5723
5724 task = _nfs41_proc_sequence(clp, cred);
5725 if (IS_ERR(task)) {
5726 ret = PTR_ERR(task);
5727 goto out;
5728 }
5729 ret = rpc_wait_for_completion_task(task);
5730 if (!ret) {
5731 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5732
5733 if (task->tk_status == 0)
5734 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5735 ret = task->tk_status;
5736 }
5737 rpc_put_task(task);
5738out:
5739 dprintk("<-- %s status=%d\n", __func__, ret);
5740 return ret;
5741}
5742
5743struct nfs4_reclaim_complete_data {
5744 struct nfs_client *clp;
5745 struct nfs41_reclaim_complete_args arg;
5746 struct nfs41_reclaim_complete_res res;
5747};
5748
5749static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5750{
5751 struct nfs4_reclaim_complete_data *calldata = data;
5752
5753 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5754 if (nfs41_setup_sequence(calldata->clp->cl_session,
5755 &calldata->arg.seq_args,
5756 &calldata->res.seq_res, task))
5757 return;
5758
5759 rpc_call_start(task);
5760}
5761
5762static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5763{
5764 switch(task->tk_status) {
5765 case 0:
5766 case -NFS4ERR_COMPLETE_ALREADY:
5767 case -NFS4ERR_WRONG_CRED: /* What to do here? */
5768 break;
5769 case -NFS4ERR_DELAY:
5770 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5771 /* fall through */
5772 case -NFS4ERR_RETRY_UNCACHED_REP:
5773 return -EAGAIN;
5774 default:
5775 nfs4_schedule_lease_recovery(clp);
5776 }
5777 return 0;
5778}
5779
5780static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5781{
5782 struct nfs4_reclaim_complete_data *calldata = data;
5783 struct nfs_client *clp = calldata->clp;
5784 struct nfs4_sequence_res *res = &calldata->res.seq_res;
5785
5786 dprintk("--> %s\n", __func__);
5787 if (!nfs41_sequence_done(task, res))
5788 return;
5789
5790 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5791 rpc_restart_call_prepare(task);
5792 return;
5793 }
5794 dprintk("<-- %s\n", __func__);
5795}
5796
5797static void nfs4_free_reclaim_complete_data(void *data)
5798{
5799 struct nfs4_reclaim_complete_data *calldata = data;
5800
5801 kfree(calldata);
5802}
5803
5804static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5805 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5806 .rpc_call_done = nfs4_reclaim_complete_done,
5807 .rpc_release = nfs4_free_reclaim_complete_data,
5808};
5809
5810/*
5811 * Issue a global reclaim complete.
5812 */
5813static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5814{
5815 struct nfs4_reclaim_complete_data *calldata;
5816 struct rpc_task *task;
5817 struct rpc_message msg = {
5818 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5819 };
5820 struct rpc_task_setup task_setup_data = {
5821 .rpc_client = clp->cl_rpcclient,
5822 .rpc_message = &msg,
5823 .callback_ops = &nfs4_reclaim_complete_call_ops,
5824 .flags = RPC_TASK_ASYNC,
5825 };
5826 int status = -ENOMEM;
5827
5828 dprintk("--> %s\n", __func__);
5829 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5830 if (calldata == NULL)
5831 goto out;
5832 calldata->clp = clp;
5833 calldata->arg.one_fs = 0;
5834
5835 nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5836 msg.rpc_argp = &calldata->arg;
5837 msg.rpc_resp = &calldata->res;
5838 task_setup_data.callback_data = calldata;
5839 task = rpc_run_task(&task_setup_data);
5840 if (IS_ERR(task)) {
5841 status = PTR_ERR(task);
5842 goto out;
5843 }
5844 status = nfs4_wait_for_completion_rpc_task(task);
5845 if (status == 0)
5846 status = task->tk_status;
5847 rpc_put_task(task);
5848 return 0;
5849out:
5850 dprintk("<-- %s status=%d\n", __func__, status);
5851 return status;
5852}
5853
5854static void
5855nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5856{
5857 struct nfs4_layoutget *lgp = calldata;
5858 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5859
5860 dprintk("--> %s\n", __func__);
5861 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5862 * right now covering the LAYOUTGET we are about to send.
5863 * However, that is not so catastrophic, and there seems
5864 * to be no way to prevent it completely.
5865 */
5866 if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5867 &lgp->res.seq_res, task))
5868 return;
5869 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5870 NFS_I(lgp->args.inode)->layout,
5871 lgp->args.ctx->state)) {
5872 rpc_exit(task, NFS4_OK);
5873 return;
5874 }
5875 rpc_call_start(task);
5876}
5877
5878static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5879{
5880 struct nfs4_layoutget *lgp = calldata;
5881 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5882
5883 dprintk("--> %s\n", __func__);
5884
5885 if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5886 return;
5887
5888 switch (task->tk_status) {
5889 case 0:
5890 break;
5891 case -NFS4ERR_LAYOUTTRYLATER:
5892 case -NFS4ERR_RECALLCONFLICT:
5893 task->tk_status = -NFS4ERR_DELAY;
5894 /* Fall through */
5895 default:
5896 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5897 rpc_restart_call_prepare(task);
5898 return;
5899 }
5900 }
5901 dprintk("<-- %s\n", __func__);
5902}
5903
5904static void nfs4_layoutget_release(void *calldata)
5905{
5906 struct nfs4_layoutget *lgp = calldata;
5907
5908 dprintk("--> %s\n", __func__);
5909 put_nfs_open_context(lgp->args.ctx);
5910 kfree(calldata);
5911 dprintk("<-- %s\n", __func__);
5912}
5913
5914static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5915 .rpc_call_prepare = nfs4_layoutget_prepare,
5916 .rpc_call_done = nfs4_layoutget_done,
5917 .rpc_release = nfs4_layoutget_release,
5918};
5919
5920int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5921{
5922 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5923 struct rpc_task *task;
5924 struct rpc_message msg = {
5925 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5926 .rpc_argp = &lgp->args,
5927 .rpc_resp = &lgp->res,
5928 };
5929 struct rpc_task_setup task_setup_data = {
5930 .rpc_client = server->client,
5931 .rpc_message = &msg,
5932 .callback_ops = &nfs4_layoutget_call_ops,
5933 .callback_data = lgp,
5934 .flags = RPC_TASK_ASYNC,
5935 };
5936 int status = 0;
5937
5938 dprintk("--> %s\n", __func__);
5939
5940 lgp->res.layoutp = &lgp->args.layout;
5941 lgp->res.seq_res.sr_slot = NULL;
5942 nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
5943 task = rpc_run_task(&task_setup_data);
5944 if (IS_ERR(task))
5945 return PTR_ERR(task);
5946 status = nfs4_wait_for_completion_rpc_task(task);
5947 if (status == 0)
5948 status = task->tk_status;
5949 if (status == 0)
5950 status = pnfs_layout_process(lgp);
5951 rpc_put_task(task);
5952 dprintk("<-- %s status=%d\n", __func__, status);
5953 return status;
5954}
5955
5956static void
5957nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5958{
5959 struct nfs4_layoutreturn *lrp = calldata;
5960
5961 dprintk("--> %s\n", __func__);
5962 if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5963 &lrp->res.seq_res, task))
5964 return;
5965 rpc_call_start(task);
5966}
5967
5968static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5969{
5970 struct nfs4_layoutreturn *lrp = calldata;
5971 struct nfs_server *server;
5972 struct pnfs_layout_hdr *lo = lrp->args.layout;
5973
5974 dprintk("--> %s\n", __func__);
5975
5976 if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5977 return;
5978
5979 server = NFS_SERVER(lrp->args.inode);
5980 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5981 rpc_restart_call_prepare(task);
5982 return;
5983 }
5984 spin_lock(&lo->plh_inode->i_lock);
5985 if (task->tk_status == 0) {
5986 if (lrp->res.lrs_present) {
5987 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5988 } else
5989 BUG_ON(!list_empty(&lo->plh_segs));
5990 }
5991 lo->plh_block_lgets--;
5992 spin_unlock(&lo->plh_inode->i_lock);
5993 dprintk("<-- %s\n", __func__);
5994}
5995
5996static void nfs4_layoutreturn_release(void *calldata)
5997{
5998 struct nfs4_layoutreturn *lrp = calldata;
5999
6000 dprintk("--> %s\n", __func__);
6001 put_layout_hdr(lrp->args.layout);
6002 kfree(calldata);
6003 dprintk("<-- %s\n", __func__);
6004}
6005
6006static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6007 .rpc_call_prepare = nfs4_layoutreturn_prepare,
6008 .rpc_call_done = nfs4_layoutreturn_done,
6009 .rpc_release = nfs4_layoutreturn_release,
6010};
6011
6012int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6013{
6014 struct rpc_task *task;
6015 struct rpc_message msg = {
6016 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6017 .rpc_argp = &lrp->args,
6018 .rpc_resp = &lrp->res,
6019 };
6020 struct rpc_task_setup task_setup_data = {
6021 .rpc_client = lrp->clp->cl_rpcclient,
6022 .rpc_message = &msg,
6023 .callback_ops = &nfs4_layoutreturn_call_ops,
6024 .callback_data = lrp,
6025 };
6026 int status;
6027
6028 dprintk("--> %s\n", __func__);
6029 nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6030 task = rpc_run_task(&task_setup_data);
6031 if (IS_ERR(task))
6032 return PTR_ERR(task);
6033 status = task->tk_status;
6034 dprintk("<-- %s status=%d\n", __func__, status);
6035 rpc_put_task(task);
6036 return status;
6037}
6038
6039/*
6040 * Retrieve the list of Data Server devices from the MDS.
6041 */
6042static int _nfs4_getdevicelist(struct nfs_server *server,
6043 const struct nfs_fh *fh,
6044 struct pnfs_devicelist *devlist)
6045{
6046 struct nfs4_getdevicelist_args args = {
6047 .fh = fh,
6048 .layoutclass = server->pnfs_curr_ld->id,
6049 };
6050 struct nfs4_getdevicelist_res res = {
6051 .devlist = devlist,
6052 };
6053 struct rpc_message msg = {
6054 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6055 .rpc_argp = &args,
6056 .rpc_resp = &res,
6057 };
6058 int status;
6059
6060 dprintk("--> %s\n", __func__);
6061 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6062 &res.seq_res, 0);
6063 dprintk("<-- %s status=%d\n", __func__, status);
6064 return status;
6065}
6066
6067int nfs4_proc_getdevicelist(struct nfs_server *server,
6068 const struct nfs_fh *fh,
6069 struct pnfs_devicelist *devlist)
6070{
6071 struct nfs4_exception exception = { };
6072 int err;
6073
6074 do {
6075 err = nfs4_handle_exception(server,
6076 _nfs4_getdevicelist(server, fh, devlist),
6077 &exception);
6078 } while (exception.retry);
6079
6080 dprintk("%s: err=%d, num_devs=%u\n", __func__,
6081 err, devlist->num_devs);
6082
6083 return err;
6084}
6085EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6086
6087static int
6088_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6089{
6090 struct nfs4_getdeviceinfo_args args = {
6091 .pdev = pdev,
6092 };
6093 struct nfs4_getdeviceinfo_res res = {
6094 .pdev = pdev,
6095 };
6096 struct rpc_message msg = {
6097 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6098 .rpc_argp = &args,
6099 .rpc_resp = &res,
6100 };
6101 int status;
6102
6103 dprintk("--> %s\n", __func__);
6104 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6105 dprintk("<-- %s status=%d\n", __func__, status);
6106
6107 return status;
6108}
6109
6110int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6111{
6112 struct nfs4_exception exception = { };
6113 int err;
6114
6115 do {
6116 err = nfs4_handle_exception(server,
6117 _nfs4_proc_getdeviceinfo(server, pdev),
6118 &exception);
6119 } while (exception.retry);
6120 return err;
6121}
6122EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6123
6124static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6125{
6126 struct nfs4_layoutcommit_data *data = calldata;
6127 struct nfs_server *server = NFS_SERVER(data->args.inode);
6128
6129 if (nfs4_setup_sequence(server, &data->args.seq_args,
6130 &data->res.seq_res, task))
6131 return;
6132 rpc_call_start(task);
6133}
6134
6135static void
6136nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6137{
6138 struct nfs4_layoutcommit_data *data = calldata;
6139 struct nfs_server *server = NFS_SERVER(data->args.inode);
6140
6141 if (!nfs4_sequence_done(task, &data->res.seq_res))
6142 return;
6143
6144 switch (task->tk_status) { /* Just ignore these failures */
6145 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6146 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
6147 case -NFS4ERR_BADLAYOUT: /* no layout */
6148 case -NFS4ERR_GRACE: /* loca_recalim always false */
6149 task->tk_status = 0;
6150 break;
6151 case 0:
6152 nfs_post_op_update_inode_force_wcc(data->args.inode,
6153 data->res.fattr);
6154 break;
6155 default:
6156 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6157 rpc_restart_call_prepare(task);
6158 return;
6159 }
6160 }
6161}
6162
6163static void nfs4_layoutcommit_release(void *calldata)
6164{
6165 struct nfs4_layoutcommit_data *data = calldata;
6166 struct pnfs_layout_segment *lseg, *tmp;
6167 unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6168
6169 pnfs_cleanup_layoutcommit(data);
6170 /* Matched by references in pnfs_set_layoutcommit */
6171 list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6172 list_del_init(&lseg->pls_lc_list);
6173 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6174 &lseg->pls_flags))
6175 put_lseg(lseg);
6176 }
6177
6178 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6179 smp_mb__after_clear_bit();
6180 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6181
6182 put_rpccred(data->cred);
6183 kfree(data);
6184}
6185
6186static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6187 .rpc_call_prepare = nfs4_layoutcommit_prepare,
6188 .rpc_call_done = nfs4_layoutcommit_done,
6189 .rpc_release = nfs4_layoutcommit_release,
6190};
6191
6192int
6193nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6194{
6195 struct rpc_message msg = {
6196 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6197 .rpc_argp = &data->args,
6198 .rpc_resp = &data->res,
6199 .rpc_cred = data->cred,
6200 };
6201 struct rpc_task_setup task_setup_data = {
6202 .task = &data->task,
6203 .rpc_client = NFS_CLIENT(data->args.inode),
6204 .rpc_message = &msg,
6205 .callback_ops = &nfs4_layoutcommit_ops,
6206 .callback_data = data,
6207 .flags = RPC_TASK_ASYNC,
6208 };
6209 struct rpc_task *task;
6210 int status = 0;
6211
6212 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6213 "lbw: %llu inode %lu\n",
6214 data->task.tk_pid, sync,
6215 data->args.lastbytewritten,
6216 data->args.inode->i_ino);
6217
6218 nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6219 task = rpc_run_task(&task_setup_data);
6220 if (IS_ERR(task))
6221 return PTR_ERR(task);
6222 if (sync == false)
6223 goto out;
6224 status = nfs4_wait_for_completion_rpc_task(task);
6225 if (status != 0)
6226 goto out;
6227 status = task->tk_status;
6228out:
6229 dprintk("%s: status %d\n", __func__, status);
6230 rpc_put_task(task);
6231 return status;
6232}
6233
6234static int
6235_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6236 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6237{
6238 struct nfs41_secinfo_no_name_args args = {
6239 .style = SECINFO_STYLE_CURRENT_FH,
6240 };
6241 struct nfs4_secinfo_res res = {
6242 .flavors = flavors,
6243 };
6244 struct rpc_message msg = {
6245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6246 .rpc_argp = &args,
6247 .rpc_resp = &res,
6248 };
6249 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6250}
6251
6252static int
6253nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6254 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6255{
6256 struct nfs4_exception exception = { };
6257 int err;
6258 do {
6259 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6260 switch (err) {
6261 case 0:
6262 case -NFS4ERR_WRONGSEC:
6263 case -NFS4ERR_NOTSUPP:
6264 goto out;
6265 default:
6266 err = nfs4_handle_exception(server, err, &exception);
6267 }
6268 } while (exception.retry);
6269out:
6270 return err;
6271}
6272
6273static int
6274nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6275 struct nfs_fsinfo *info)
6276{
6277 int err;
6278 struct page *page;
6279 rpc_authflavor_t flavor;
6280 struct nfs4_secinfo_flavors *flavors;
6281
6282 page = alloc_page(GFP_KERNEL);
6283 if (!page) {
6284 err = -ENOMEM;
6285 goto out;
6286 }
6287
6288 flavors = page_address(page);
6289 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6290
6291 /*
6292 * Fall back on "guess and check" method if
6293 * the server doesn't support SECINFO_NO_NAME
6294 */
6295 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6296 err = nfs4_find_root_sec(server, fhandle, info);
6297 goto out_freepage;
6298 }
6299 if (err)
6300 goto out_freepage;
6301
6302 flavor = nfs_find_best_sec(flavors);
6303 if (err == 0)
6304 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6305
6306out_freepage:
6307 put_page(page);
6308 if (err == -EACCES)
6309 return -EPERM;
6310out:
6311 return err;
6312}
6313
6314static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6315{
6316 int status;
6317 struct nfs41_test_stateid_args args = {
6318 .stateid = stateid,
6319 };
6320 struct nfs41_test_stateid_res res;
6321 struct rpc_message msg = {
6322 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6323 .rpc_argp = &args,
6324 .rpc_resp = &res,
6325 };
6326
6327 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6328 status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6329
6330 if (status == NFS_OK)
6331 return res.status;
6332 return status;
6333}
6334
6335static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6336{
6337 struct nfs4_exception exception = { };
6338 int err;
6339 do {
6340 err = nfs4_handle_exception(server,
6341 _nfs41_test_stateid(server, stateid),
6342 &exception);
6343 } while (exception.retry);
6344 return err;
6345}
6346
6347static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6348{
6349 struct nfs41_free_stateid_args args = {
6350 .stateid = stateid,
6351 };
6352 struct nfs41_free_stateid_res res;
6353 struct rpc_message msg = {
6354 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6355 .rpc_argp = &args,
6356 .rpc_resp = &res,
6357 };
6358
6359 nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6360 return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6361}
6362
6363static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6364{
6365 struct nfs4_exception exception = { };
6366 int err;
6367 do {
6368 err = nfs4_handle_exception(server,
6369 _nfs4_free_stateid(server, stateid),
6370 &exception);
6371 } while (exception.retry);
6372 return err;
6373}
6374
6375static bool nfs41_match_stateid(const nfs4_stateid *s1,
6376 const nfs4_stateid *s2)
6377{
6378 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6379 return false;
6380
6381 if (s1->seqid == s2->seqid)
6382 return true;
6383 if (s1->seqid == 0 || s2->seqid == 0)
6384 return true;
6385
6386 return false;
6387}
6388
6389#endif /* CONFIG_NFS_V4_1 */
6390
6391static bool nfs4_match_stateid(const nfs4_stateid *s1,
6392 const nfs4_stateid *s2)
6393{
6394 return nfs4_stateid_match(s1, s2);
6395}
6396
6397
6398static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6399 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6400 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6401 .recover_open = nfs4_open_reclaim,
6402 .recover_lock = nfs4_lock_reclaim,
6403 .establish_clid = nfs4_init_clientid,
6404 .get_clid_cred = nfs4_get_setclientid_cred,
6405};
6406
6407#if defined(CONFIG_NFS_V4_1)
6408static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6409 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6410 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6411 .recover_open = nfs4_open_reclaim,
6412 .recover_lock = nfs4_lock_reclaim,
6413 .establish_clid = nfs41_init_clientid,
6414 .get_clid_cred = nfs4_get_exchange_id_cred,
6415 .reclaim_complete = nfs41_proc_reclaim_complete,
6416};
6417#endif /* CONFIG_NFS_V4_1 */
6418
6419static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6420 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6421 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6422 .recover_open = nfs4_open_expired,
6423 .recover_lock = nfs4_lock_expired,
6424 .establish_clid = nfs4_init_clientid,
6425 .get_clid_cred = nfs4_get_setclientid_cred,
6426};
6427
6428#if defined(CONFIG_NFS_V4_1)
6429static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6430 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6431 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6432 .recover_open = nfs41_open_expired,
6433 .recover_lock = nfs41_lock_expired,
6434 .establish_clid = nfs41_init_clientid,
6435 .get_clid_cred = nfs4_get_exchange_id_cred,
6436};
6437#endif /* CONFIG_NFS_V4_1 */
6438
6439static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6440 .sched_state_renewal = nfs4_proc_async_renew,
6441 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6442 .renew_lease = nfs4_proc_renew,
6443};
6444
6445#if defined(CONFIG_NFS_V4_1)
6446static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6447 .sched_state_renewal = nfs41_proc_async_sequence,
6448 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6449 .renew_lease = nfs4_proc_sequence,
6450};
6451#endif
6452
6453static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6454 .minor_version = 0,
6455 .call_sync = _nfs4_call_sync,
6456 .match_stateid = nfs4_match_stateid,
6457 .find_root_sec = nfs4_find_root_sec,
6458 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6459 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6460 .state_renewal_ops = &nfs40_state_renewal_ops,
6461};
6462
6463#if defined(CONFIG_NFS_V4_1)
6464static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6465 .minor_version = 1,
6466 .call_sync = _nfs4_call_sync_session,
6467 .match_stateid = nfs41_match_stateid,
6468 .find_root_sec = nfs41_find_root_sec,
6469 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6470 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6471 .state_renewal_ops = &nfs41_state_renewal_ops,
6472};
6473#endif
6474
6475const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6476 [0] = &nfs_v4_0_minor_ops,
6477#if defined(CONFIG_NFS_V4_1)
6478 [1] = &nfs_v4_1_minor_ops,
6479#endif
6480};
6481
6482static const struct inode_operations nfs4_file_inode_operations = {
6483 .permission = nfs_permission,
6484 .getattr = nfs_getattr,
6485 .setattr = nfs_setattr,
6486 .getxattr = generic_getxattr,
6487 .setxattr = generic_setxattr,
6488 .listxattr = generic_listxattr,
6489 .removexattr = generic_removexattr,
6490};
6491
6492const struct nfs_rpc_ops nfs_v4_clientops = {
6493 .version = 4, /* protocol version */
6494 .dentry_ops = &nfs4_dentry_operations,
6495 .dir_inode_ops = &nfs4_dir_inode_operations,
6496 .file_inode_ops = &nfs4_file_inode_operations,
6497 .file_ops = &nfs4_file_operations,
6498 .getroot = nfs4_proc_get_root,
6499 .getattr = nfs4_proc_getattr,
6500 .setattr = nfs4_proc_setattr,
6501 .lookup = nfs4_proc_lookup,
6502 .access = nfs4_proc_access,
6503 .readlink = nfs4_proc_readlink,
6504 .create = nfs4_proc_create,
6505 .remove = nfs4_proc_remove,
6506 .unlink_setup = nfs4_proc_unlink_setup,
6507 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6508 .unlink_done = nfs4_proc_unlink_done,
6509 .rename = nfs4_proc_rename,
6510 .rename_setup = nfs4_proc_rename_setup,
6511 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6512 .rename_done = nfs4_proc_rename_done,
6513 .link = nfs4_proc_link,
6514 .symlink = nfs4_proc_symlink,
6515 .mkdir = nfs4_proc_mkdir,
6516 .rmdir = nfs4_proc_remove,
6517 .readdir = nfs4_proc_readdir,
6518 .mknod = nfs4_proc_mknod,
6519 .statfs = nfs4_proc_statfs,
6520 .fsinfo = nfs4_proc_fsinfo,
6521 .pathconf = nfs4_proc_pathconf,
6522 .set_capabilities = nfs4_server_capabilities,
6523 .decode_dirent = nfs4_decode_dirent,
6524 .read_setup = nfs4_proc_read_setup,
6525 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6526 .read_done = nfs4_read_done,
6527 .write_setup = nfs4_proc_write_setup,
6528 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6529 .write_done = nfs4_write_done,
6530 .commit_setup = nfs4_proc_commit_setup,
6531 .commit_done = nfs4_commit_done,
6532 .lock = nfs4_proc_lock,
6533 .clear_acl_cache = nfs4_zap_acl_attr,
6534 .close_context = nfs4_close_context,
6535 .open_context = nfs4_atomic_open,
6536 .init_client = nfs4_init_client,
6537 .secinfo = nfs4_proc_secinfo,
6538};
6539
6540static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6541 .prefix = XATTR_NAME_NFSV4_ACL,
6542 .list = nfs4_xattr_list_nfs4_acl,
6543 .get = nfs4_xattr_get_nfs4_acl,
6544 .set = nfs4_xattr_set_nfs4_acl,
6545};
6546
6547const struct xattr_handler *nfs4_xattr_handlers[] = {
6548 &nfs4_xattr_nfs4_acl_handler,
6549 NULL
6550};
6551
6552module_param(max_session_slots, ushort, 0644);
6553MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6554 "requests the client will negotiate");
6555
6556/*
6557 * Local variables:
6558 * c-basic-offset: 8
6559 * End:
6560 */
Linux 6.x block layer and io_uring tree(s)