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Linux 4.6-rc6
[cris-mirror.git] / fs / nfs / nfs4state.c
blobd854693a15b0e2443779986552d29d9db3f6cdc2
1 /*
2 * fs/nfs/nfs4state.c
3 *
4 * Client-side XDR 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 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
38 * subsequent patch.
39 */
40
41 #include <linux/kernel.h>
42 #include <linux/slab.h>
43 #include <linux/fs.h>
44 #include <linux/nfs_fs.h>
45 #include <linux/kthread.h>
46 #include <linux/module.h>
47 #include <linux/random.h>
48 #include <linux/ratelimit.h>
49 #include <linux/workqueue.h>
50 #include <linux/bitops.h>
51 #include <linux/jiffies.h>
52
53 #include <linux/sunrpc/clnt.h>
54
55 #include "nfs4_fs.h"
56 #include "callback.h"
57 #include "delegation.h"
58 #include "internal.h"
59 #include "nfs4idmap.h"
60 #include "nfs4session.h"
61 #include "pnfs.h"
62 #include "netns.h"
63
64 #define NFSDBG_FACILITY NFSDBG_STATE
65
66 #define OPENOWNER_POOL_SIZE 8
67
68 const nfs4_stateid zero_stateid;
69 static DEFINE_MUTEX(nfs_clid_init_mutex);
70
71 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
72 {
73 struct nfs4_setclientid_res clid = {
74 .clientid = clp->cl_clientid,
75 .confirm = clp->cl_confirm,
76 };
77 unsigned short port;
78 int status;
79 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
80
81 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
82 goto do_confirm;
83 port = nn->nfs_callback_tcpport;
84 if (clp->cl_addr.ss_family == AF_INET6)
85 port = nn->nfs_callback_tcpport6;
86
87 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
88 if (status != 0)
89 goto out;
90 clp->cl_clientid = clid.clientid;
91 clp->cl_confirm = clid.confirm;
92 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
93 do_confirm:
94 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
95 if (status != 0)
96 goto out;
97 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
98 nfs4_schedule_state_renewal(clp);
99 out:
100 return status;
101 }
102
103 /**
104 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
105 *
106 * @clp: nfs_client under test
107 * @result: OUT: found nfs_client, or clp
108 * @cred: credential to use for trunking test
109 *
110 * Returns zero, a negative errno, or a negative NFS4ERR status.
111 * If zero is returned, an nfs_client pointer is planted in
112 * "result".
113 *
114 * Note: The returned client may not yet be marked ready.
115 */
116 int nfs40_discover_server_trunking(struct nfs_client *clp,
117 struct nfs_client **result,
118 struct rpc_cred *cred)
119 {
120 struct nfs4_setclientid_res clid = {
121 .clientid = clp->cl_clientid,
122 .confirm = clp->cl_confirm,
123 };
124 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
125 unsigned short port;
126 int status;
127
128 port = nn->nfs_callback_tcpport;
129 if (clp->cl_addr.ss_family == AF_INET6)
130 port = nn->nfs_callback_tcpport6;
131
132 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
133 if (status != 0)
134 goto out;
135 clp->cl_clientid = clid.clientid;
136 clp->cl_confirm = clid.confirm;
137
138 status = nfs40_walk_client_list(clp, result, cred);
139 if (status == 0) {
140 /* Sustain the lease, even if it's empty. If the clientid4
141 * goes stale it's of no use for trunking discovery. */
142 nfs4_schedule_state_renewal(*result);
143 }
144 out:
145 return status;
146 }
147
148 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
149 {
150 struct rpc_cred *cred = NULL;
151
152 if (clp->cl_machine_cred != NULL)
153 cred = get_rpccred(clp->cl_machine_cred);
154 return cred;
155 }
156
157 static void nfs4_root_machine_cred(struct nfs_client *clp)
158 {
159 struct rpc_cred *cred, *new;
160
161 new = rpc_lookup_machine_cred(NULL);
162 spin_lock(&clp->cl_lock);
163 cred = clp->cl_machine_cred;
164 clp->cl_machine_cred = new;
165 spin_unlock(&clp->cl_lock);
166 if (cred != NULL)
167 put_rpccred(cred);
168 }
169
170 static struct rpc_cred *
171 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
172 {
173 struct rpc_cred *cred = NULL;
174 struct nfs4_state_owner *sp;
175 struct rb_node *pos;
176
177 for (pos = rb_first(&server->state_owners);
178 pos != NULL;
179 pos = rb_next(pos)) {
180 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
181 if (list_empty(&sp->so_states))
182 continue;
183 cred = get_rpccred(sp->so_cred);
184 break;
185 }
186 return cred;
187 }
188
189 /**
190 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
191 * @clp: client state handle
192 *
193 * Returns an rpc_cred with reference count bumped, or NULL.
194 * Caller must hold clp->cl_lock.
195 */
196 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
197 {
198 struct rpc_cred *cred = NULL;
199 struct nfs_server *server;
200
201 /* Use machine credentials if available */
202 cred = nfs4_get_machine_cred_locked(clp);
203 if (cred != NULL)
204 goto out;
205
206 rcu_read_lock();
207 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
208 cred = nfs4_get_renew_cred_server_locked(server);
209 if (cred != NULL)
210 break;
211 }
212 rcu_read_unlock();
213
214 out:
215 return cred;
216 }
217
218 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
219 {
220 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
221 spin_lock(&tbl->slot_tbl_lock);
222 nfs41_wake_slot_table(tbl);
223 spin_unlock(&tbl->slot_tbl_lock);
224 }
225 }
226
227 static void nfs4_end_drain_session(struct nfs_client *clp)
228 {
229 struct nfs4_session *ses = clp->cl_session;
230
231 if (clp->cl_slot_tbl) {
232 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
233 return;
234 }
235
236 if (ses != NULL) {
237 nfs4_end_drain_slot_table(&ses->bc_slot_table);
238 nfs4_end_drain_slot_table(&ses->fc_slot_table);
239 }
240 }
241
242 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
243 {
244 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
245 spin_lock(&tbl->slot_tbl_lock);
246 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
247 reinit_completion(&tbl->complete);
248 spin_unlock(&tbl->slot_tbl_lock);
249 return wait_for_completion_interruptible(&tbl->complete);
250 }
251 spin_unlock(&tbl->slot_tbl_lock);
252 return 0;
253 }
254
255 static int nfs4_begin_drain_session(struct nfs_client *clp)
256 {
257 struct nfs4_session *ses = clp->cl_session;
258 int ret = 0;
259
260 if (clp->cl_slot_tbl)
261 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
262
263 /* back channel */
264 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
265 if (ret)
266 return ret;
267 /* fore channel */
268 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
269 }
270
271 #if defined(CONFIG_NFS_V4_1)
272
273 static int nfs41_setup_state_renewal(struct nfs_client *clp)
274 {
275 int status;
276 struct nfs_fsinfo fsinfo;
277
278 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
279 nfs4_schedule_state_renewal(clp);
280 return 0;
281 }
282
283 status = nfs4_proc_get_lease_time(clp, &fsinfo);
284 if (status == 0) {
285 /* Update lease time and schedule renewal */
286 spin_lock(&clp->cl_lock);
287 clp->cl_lease_time = fsinfo.lease_time * HZ;
288 clp->cl_last_renewal = jiffies;
289 spin_unlock(&clp->cl_lock);
290
291 nfs4_schedule_state_renewal(clp);
292 }
293
294 return status;
295 }
296
297 static void nfs41_finish_session_reset(struct nfs_client *clp)
298 {
299 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
300 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
301 /* create_session negotiated new slot table */
302 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
303 nfs41_setup_state_renewal(clp);
304 }
305
306 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
307 {
308 int status;
309
310 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
311 goto do_confirm;
312 status = nfs4_proc_exchange_id(clp, cred);
313 if (status != 0)
314 goto out;
315 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
316 do_confirm:
317 status = nfs4_proc_create_session(clp, cred);
318 if (status != 0)
319 goto out;
320 nfs41_finish_session_reset(clp);
321 nfs_mark_client_ready(clp, NFS_CS_READY);
322 out:
323 return status;
324 }
325
326 /**
327 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
328 *
329 * @clp: nfs_client under test
330 * @result: OUT: found nfs_client, or clp
331 * @cred: credential to use for trunking test
332 *
333 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
334 * If NFS4_OK is returned, an nfs_client pointer is planted in
335 * "result".
336 *
337 * Note: The returned client may not yet be marked ready.
338 */
339 int nfs41_discover_server_trunking(struct nfs_client *clp,
340 struct nfs_client **result,
341 struct rpc_cred *cred)
342 {
343 int status;
344
345 status = nfs4_proc_exchange_id(clp, cred);
346 if (status != NFS4_OK)
347 return status;
348
349 status = nfs41_walk_client_list(clp, result, cred);
350 if (status < 0)
351 return status;
352 if (clp != *result)
353 return 0;
354
355 /* Purge state if the client id was established in a prior instance */
356 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
357 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
358 else
359 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
360 nfs4_schedule_state_manager(clp);
361 status = nfs_wait_client_init_complete(clp);
362 if (status < 0)
363 nfs_put_client(clp);
364 return status;
365 }
366
367 #endif /* CONFIG_NFS_V4_1 */
368
369 /**
370 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
371 * @clp: client state handle
372 *
373 * Returns an rpc_cred with reference count bumped, or NULL.
374 */
375 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
376 {
377 struct rpc_cred *cred;
378
379 spin_lock(&clp->cl_lock);
380 cred = nfs4_get_machine_cred_locked(clp);
381 spin_unlock(&clp->cl_lock);
382 return cred;
383 }
384
385 static struct nfs4_state_owner *
386 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
387 {
388 struct rb_node **p = &server->state_owners.rb_node,
389 *parent = NULL;
390 struct nfs4_state_owner *sp;
391
392 while (*p != NULL) {
393 parent = *p;
394 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
395
396 if (cred < sp->so_cred)
397 p = &parent->rb_left;
398 else if (cred > sp->so_cred)
399 p = &parent->rb_right;
400 else {
401 if (!list_empty(&sp->so_lru))
402 list_del_init(&sp->so_lru);
403 atomic_inc(&sp->so_count);
404 return sp;
405 }
406 }
407 return NULL;
408 }
409
410 static struct nfs4_state_owner *
411 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
412 {
413 struct nfs_server *server = new->so_server;
414 struct rb_node **p = &server->state_owners.rb_node,
415 *parent = NULL;
416 struct nfs4_state_owner *sp;
417 int err;
418
419 while (*p != NULL) {
420 parent = *p;
421 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
422
423 if (new->so_cred < sp->so_cred)
424 p = &parent->rb_left;
425 else if (new->so_cred > sp->so_cred)
426 p = &parent->rb_right;
427 else {
428 if (!list_empty(&sp->so_lru))
429 list_del_init(&sp->so_lru);
430 atomic_inc(&sp->so_count);
431 return sp;
432 }
433 }
434 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
435 if (err)
436 return ERR_PTR(err);
437 rb_link_node(&new->so_server_node, parent, p);
438 rb_insert_color(&new->so_server_node, &server->state_owners);
439 return new;
440 }
441
442 static void
443 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
444 {
445 struct nfs_server *server = sp->so_server;
446
447 if (!RB_EMPTY_NODE(&sp->so_server_node))
448 rb_erase(&sp->so_server_node, &server->state_owners);
449 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
450 }
451
452 static void
453 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
454 {
455 sc->create_time = ktime_get();
456 sc->flags = 0;
457 sc->counter = 0;
458 spin_lock_init(&sc->lock);
459 INIT_LIST_HEAD(&sc->list);
460 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
461 }
462
463 static void
464 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
465 {
466 rpc_destroy_wait_queue(&sc->wait);
467 }
468
469 /*
470 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
471 * create a new state_owner.
472 *
473 */
474 static struct nfs4_state_owner *
475 nfs4_alloc_state_owner(struct nfs_server *server,
476 struct rpc_cred *cred,
477 gfp_t gfp_flags)
478 {
479 struct nfs4_state_owner *sp;
480
481 sp = kzalloc(sizeof(*sp), gfp_flags);
482 if (!sp)
483 return NULL;
484 sp->so_server = server;
485 sp->so_cred = get_rpccred(cred);
486 spin_lock_init(&sp->so_lock);
487 INIT_LIST_HEAD(&sp->so_states);
488 nfs4_init_seqid_counter(&sp->so_seqid);
489 atomic_set(&sp->so_count, 1);
490 INIT_LIST_HEAD(&sp->so_lru);
491 seqcount_init(&sp->so_reclaim_seqcount);
492 mutex_init(&sp->so_delegreturn_mutex);
493 return sp;
494 }
495
496 static void
497 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
498 {
499 struct rb_node *rb_node = &sp->so_server_node;
500
501 if (!RB_EMPTY_NODE(rb_node)) {
502 struct nfs_server *server = sp->so_server;
503 struct nfs_client *clp = server->nfs_client;
504
505 spin_lock(&clp->cl_lock);
506 if (!RB_EMPTY_NODE(rb_node)) {
507 rb_erase(rb_node, &server->state_owners);
508 RB_CLEAR_NODE(rb_node);
509 }
510 spin_unlock(&clp->cl_lock);
511 }
512 }
513
514 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
515 {
516 nfs4_destroy_seqid_counter(&sp->so_seqid);
517 put_rpccred(sp->so_cred);
518 kfree(sp);
519 }
520
521 static void nfs4_gc_state_owners(struct nfs_server *server)
522 {
523 struct nfs_client *clp = server->nfs_client;
524 struct nfs4_state_owner *sp, *tmp;
525 unsigned long time_min, time_max;
526 LIST_HEAD(doomed);
527
528 spin_lock(&clp->cl_lock);
529 time_max = jiffies;
530 time_min = (long)time_max - (long)clp->cl_lease_time;
531 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
532 /* NB: LRU is sorted so that oldest is at the head */
533 if (time_in_range(sp->so_expires, time_min, time_max))
534 break;
535 list_move(&sp->so_lru, &doomed);
536 nfs4_remove_state_owner_locked(sp);
537 }
538 spin_unlock(&clp->cl_lock);
539
540 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
541 list_del(&sp->so_lru);
542 nfs4_free_state_owner(sp);
543 }
544 }
545
546 /**
547 * nfs4_get_state_owner - Look up a state owner given a credential
548 * @server: nfs_server to search
549 * @cred: RPC credential to match
550 *
551 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
552 */
553 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
554 struct rpc_cred *cred,
555 gfp_t gfp_flags)
556 {
557 struct nfs_client *clp = server->nfs_client;
558 struct nfs4_state_owner *sp, *new;
559
560 spin_lock(&clp->cl_lock);
561 sp = nfs4_find_state_owner_locked(server, cred);
562 spin_unlock(&clp->cl_lock);
563 if (sp != NULL)
564 goto out;
565 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
566 if (new == NULL)
567 goto out;
568 do {
569 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
570 break;
571 spin_lock(&clp->cl_lock);
572 sp = nfs4_insert_state_owner_locked(new);
573 spin_unlock(&clp->cl_lock);
574 } while (sp == ERR_PTR(-EAGAIN));
575 if (sp != new)
576 nfs4_free_state_owner(new);
577 out:
578 nfs4_gc_state_owners(server);
579 return sp;
580 }
581
582 /**
583 * nfs4_put_state_owner - Release a nfs4_state_owner
584 * @sp: state owner data to release
585 *
586 * Note that we keep released state owners on an LRU
587 * list.
588 * This caches valid state owners so that they can be
589 * reused, to avoid the OPEN_CONFIRM on minor version 0.
590 * It also pins the uniquifier of dropped state owners for
591 * a while, to ensure that those state owner names are
592 * never reused.
593 */
594 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
595 {
596 struct nfs_server *server = sp->so_server;
597 struct nfs_client *clp = server->nfs_client;
598
599 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
600 return;
601
602 sp->so_expires = jiffies;
603 list_add_tail(&sp->so_lru, &server->state_owners_lru);
604 spin_unlock(&clp->cl_lock);
605 }
606
607 /**
608 * nfs4_purge_state_owners - Release all cached state owners
609 * @server: nfs_server with cached state owners to release
610 *
611 * Called at umount time. Remaining state owners will be on
612 * the LRU with ref count of zero.
613 */
614 void nfs4_purge_state_owners(struct nfs_server *server)
615 {
616 struct nfs_client *clp = server->nfs_client;
617 struct nfs4_state_owner *sp, *tmp;
618 LIST_HEAD(doomed);
619
620 spin_lock(&clp->cl_lock);
621 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
622 list_move(&sp->so_lru, &doomed);
623 nfs4_remove_state_owner_locked(sp);
624 }
625 spin_unlock(&clp->cl_lock);
626
627 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
628 list_del(&sp->so_lru);
629 nfs4_free_state_owner(sp);
630 }
631 }
632
633 static struct nfs4_state *
634 nfs4_alloc_open_state(void)
635 {
636 struct nfs4_state *state;
637
638 state = kzalloc(sizeof(*state), GFP_NOFS);
639 if (!state)
640 return NULL;
641 atomic_set(&state->count, 1);
642 INIT_LIST_HEAD(&state->lock_states);
643 spin_lock_init(&state->state_lock);
644 seqlock_init(&state->seqlock);
645 return state;
646 }
647
648 void
649 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
650 {
651 if (state->state == fmode)
652 return;
653 /* NB! List reordering - see the reclaim code for why. */
654 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
655 if (fmode & FMODE_WRITE)
656 list_move(&state->open_states, &state->owner->so_states);
657 else
658 list_move_tail(&state->open_states, &state->owner->so_states);
659 }
660 state->state = fmode;
661 }
662
663 static struct nfs4_state *
664 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
665 {
666 struct nfs_inode *nfsi = NFS_I(inode);
667 struct nfs4_state *state;
668
669 list_for_each_entry(state, &nfsi->open_states, inode_states) {
670 if (state->owner != owner)
671 continue;
672 if (!nfs4_valid_open_stateid(state))
673 continue;
674 if (atomic_inc_not_zero(&state->count))
675 return state;
676 }
677 return NULL;
678 }
679
680 static void
681 nfs4_free_open_state(struct nfs4_state *state)
682 {
683 kfree(state);
684 }
685
686 struct nfs4_state *
687 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
688 {
689 struct nfs4_state *state, *new;
690 struct nfs_inode *nfsi = NFS_I(inode);
691
692 spin_lock(&inode->i_lock);
693 state = __nfs4_find_state_byowner(inode, owner);
694 spin_unlock(&inode->i_lock);
695 if (state)
696 goto out;
697 new = nfs4_alloc_open_state();
698 spin_lock(&owner->so_lock);
699 spin_lock(&inode->i_lock);
700 state = __nfs4_find_state_byowner(inode, owner);
701 if (state == NULL && new != NULL) {
702 state = new;
703 state->owner = owner;
704 atomic_inc(&owner->so_count);
705 list_add(&state->inode_states, &nfsi->open_states);
706 ihold(inode);
707 state->inode = inode;
708 spin_unlock(&inode->i_lock);
709 /* Note: The reclaim code dictates that we add stateless
710 * and read-only stateids to the end of the list */
711 list_add_tail(&state->open_states, &owner->so_states);
712 spin_unlock(&owner->so_lock);
713 } else {
714 spin_unlock(&inode->i_lock);
715 spin_unlock(&owner->so_lock);
716 if (new)
717 nfs4_free_open_state(new);
718 }
719 out:
720 return state;
721 }
722
723 void nfs4_put_open_state(struct nfs4_state *state)
724 {
725 struct inode *inode = state->inode;
726 struct nfs4_state_owner *owner = state->owner;
727
728 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
729 return;
730 spin_lock(&inode->i_lock);
731 list_del(&state->inode_states);
732 list_del(&state->open_states);
733 spin_unlock(&inode->i_lock);
734 spin_unlock(&owner->so_lock);
735 iput(inode);
736 nfs4_free_open_state(state);
737 nfs4_put_state_owner(owner);
738 }
739
740 /*
741 * Close the current file.
742 */
743 static void __nfs4_close(struct nfs4_state *state,
744 fmode_t fmode, gfp_t gfp_mask, int wait)
745 {
746 struct nfs4_state_owner *owner = state->owner;
747 int call_close = 0;
748 fmode_t newstate;
749
750 atomic_inc(&owner->so_count);
751 /* Protect against nfs4_find_state() */
752 spin_lock(&owner->so_lock);
753 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
754 case FMODE_READ:
755 state->n_rdonly--;
756 break;
757 case FMODE_WRITE:
758 state->n_wronly--;
759 break;
760 case FMODE_READ|FMODE_WRITE:
761 state->n_rdwr--;
762 }
763 newstate = FMODE_READ|FMODE_WRITE;
764 if (state->n_rdwr == 0) {
765 if (state->n_rdonly == 0) {
766 newstate &= ~FMODE_READ;
767 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
768 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
769 }
770 if (state->n_wronly == 0) {
771 newstate &= ~FMODE_WRITE;
772 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
773 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
774 }
775 if (newstate == 0)
776 clear_bit(NFS_DELEGATED_STATE, &state->flags);
777 }
778 nfs4_state_set_mode_locked(state, newstate);
779 spin_unlock(&owner->so_lock);
780
781 if (!call_close) {
782 nfs4_put_open_state(state);
783 nfs4_put_state_owner(owner);
784 } else
785 nfs4_do_close(state, gfp_mask, wait);
786 }
787
788 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
789 {
790 __nfs4_close(state, fmode, GFP_NOFS, 0);
791 }
792
793 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
794 {
795 __nfs4_close(state, fmode, GFP_KERNEL, 1);
796 }
797
798 /*
799 * Search the state->lock_states for an existing lock_owner
800 * that is compatible with current->files
801 */
802 static struct nfs4_lock_state *
803 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
804 {
805 struct nfs4_lock_state *pos;
806 list_for_each_entry(pos, &state->lock_states, ls_locks) {
807 if (pos->ls_owner != fl_owner)
808 continue;
809 atomic_inc(&pos->ls_count);
810 return pos;
811 }
812 return NULL;
813 }
814
815 /*
816 * Return a compatible lock_state. If no initialized lock_state structure
817 * exists, return an uninitialized one.
818 *
819 */
820 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
821 {
822 struct nfs4_lock_state *lsp;
823 struct nfs_server *server = state->owner->so_server;
824
825 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
826 if (lsp == NULL)
827 return NULL;
828 nfs4_init_seqid_counter(&lsp->ls_seqid);
829 atomic_set(&lsp->ls_count, 1);
830 lsp->ls_state = state;
831 lsp->ls_owner = fl_owner;
832 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
833 if (lsp->ls_seqid.owner_id < 0)
834 goto out_free;
835 INIT_LIST_HEAD(&lsp->ls_locks);
836 return lsp;
837 out_free:
838 kfree(lsp);
839 return NULL;
840 }
841
842 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
843 {
844 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
845 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
846 kfree(lsp);
847 }
848
849 /*
850 * Return a compatible lock_state. If no initialized lock_state structure
851 * exists, return an uninitialized one.
852 *
853 */
854 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
855 {
856 struct nfs4_lock_state *lsp, *new = NULL;
857
858 for(;;) {
859 spin_lock(&state->state_lock);
860 lsp = __nfs4_find_lock_state(state, owner);
861 if (lsp != NULL)
862 break;
863 if (new != NULL) {
864 list_add(&new->ls_locks, &state->lock_states);
865 set_bit(LK_STATE_IN_USE, &state->flags);
866 lsp = new;
867 new = NULL;
868 break;
869 }
870 spin_unlock(&state->state_lock);
871 new = nfs4_alloc_lock_state(state, owner);
872 if (new == NULL)
873 return NULL;
874 }
875 spin_unlock(&state->state_lock);
876 if (new != NULL)
877 nfs4_free_lock_state(state->owner->so_server, new);
878 return lsp;
879 }
880
881 /*
882 * Release reference to lock_state, and free it if we see that
883 * it is no longer in use
884 */
885 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
886 {
887 struct nfs_server *server;
888 struct nfs4_state *state;
889
890 if (lsp == NULL)
891 return;
892 state = lsp->ls_state;
893 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
894 return;
895 list_del(&lsp->ls_locks);
896 if (list_empty(&state->lock_states))
897 clear_bit(LK_STATE_IN_USE, &state->flags);
898 spin_unlock(&state->state_lock);
899 server = state->owner->so_server;
900 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
901 struct nfs_client *clp = server->nfs_client;
902
903 clp->cl_mvops->free_lock_state(server, lsp);
904 } else
905 nfs4_free_lock_state(server, lsp);
906 }
907
908 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
909 {
910 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
911
912 dst->fl_u.nfs4_fl.owner = lsp;
913 atomic_inc(&lsp->ls_count);
914 }
915
916 static void nfs4_fl_release_lock(struct file_lock *fl)
917 {
918 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
919 }
920
921 static const struct file_lock_operations nfs4_fl_lock_ops = {
922 .fl_copy_lock = nfs4_fl_copy_lock,
923 .fl_release_private = nfs4_fl_release_lock,
924 };
925
926 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
927 {
928 struct nfs4_lock_state *lsp;
929
930 if (fl->fl_ops != NULL)
931 return 0;
932 lsp = nfs4_get_lock_state(state, fl->fl_owner);
933 if (lsp == NULL)
934 return -ENOMEM;
935 fl->fl_u.nfs4_fl.owner = lsp;
936 fl->fl_ops = &nfs4_fl_lock_ops;
937 return 0;
938 }
939
940 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
941 struct nfs4_state *state,
942 const struct nfs_lockowner *lockowner)
943 {
944 struct nfs4_lock_state *lsp;
945 fl_owner_t fl_owner;
946 int ret = -ENOENT;
947
948
949 if (lockowner == NULL)
950 goto out;
951
952 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
953 goto out;
954
955 fl_owner = lockowner->l_owner;
956 spin_lock(&state->state_lock);
957 lsp = __nfs4_find_lock_state(state, fl_owner);
958 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
959 ret = -EIO;
960 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
961 nfs4_stateid_copy(dst, &lsp->ls_stateid);
962 ret = 0;
963 }
964 spin_unlock(&state->state_lock);
965 nfs4_put_lock_state(lsp);
966 out:
967 return ret;
968 }
969
970 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
971 {
972 const nfs4_stateid *src;
973 int seq;
974
975 do {
976 src = &zero_stateid;
977 seq = read_seqbegin(&state->seqlock);
978 if (test_bit(NFS_OPEN_STATE, &state->flags))
979 src = &state->open_stateid;
980 nfs4_stateid_copy(dst, src);
981 } while (read_seqretry(&state->seqlock, seq));
982 }
983
984 /*
985 * Byte-range lock aware utility to initialize the stateid of read/write
986 * requests.
987 */
988 int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
989 fmode_t fmode, const struct nfs_lockowner *lockowner)
990 {
991 int ret = nfs4_copy_lock_stateid(dst, state, lockowner);
992 if (ret == -EIO)
993 /* A lost lock - don't even consider delegations */
994 goto out;
995 /* returns true if delegation stateid found and copied */
996 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) {
997 ret = 0;
998 goto out;
999 }
1000 if (ret != -ENOENT)
1001 /* nfs4_copy_delegation_stateid() didn't over-write
1002 * dst, so it still has the lock stateid which we now
1003 * choose to use.
1004 */
1005 goto out;
1006 nfs4_copy_open_stateid(dst, state);
1007 ret = 0;
1008 out:
1009 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1010 dst->seqid = 0;
1011 return ret;
1012 }
1013
1014 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1015 {
1016 struct nfs_seqid *new;
1017
1018 new = kmalloc(sizeof(*new), gfp_mask);
1019 if (new == NULL)
1020 return ERR_PTR(-ENOMEM);
1021 new->sequence = counter;
1022 INIT_LIST_HEAD(&new->list);
1023 new->task = NULL;
1024 return new;
1025 }
1026
1027 void nfs_release_seqid(struct nfs_seqid *seqid)
1028 {
1029 struct nfs_seqid_counter *sequence;
1030
1031 if (seqid == NULL || list_empty(&seqid->list))
1032 return;
1033 sequence = seqid->sequence;
1034 spin_lock(&sequence->lock);
1035 list_del_init(&seqid->list);
1036 if (!list_empty(&sequence->list)) {
1037 struct nfs_seqid *next;
1038
1039 next = list_first_entry(&sequence->list,
1040 struct nfs_seqid, list);
1041 rpc_wake_up_queued_task(&sequence->wait, next->task);
1042 }
1043 spin_unlock(&sequence->lock);
1044 }
1045
1046 void nfs_free_seqid(struct nfs_seqid *seqid)
1047 {
1048 nfs_release_seqid(seqid);
1049 kfree(seqid);
1050 }
1051
1052 /*
1053 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1054 * failed with a seqid incrementing error -
1055 * see comments nfs4.h:seqid_mutating_error()
1056 */
1057 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1058 {
1059 switch (status) {
1060 case 0:
1061 break;
1062 case -NFS4ERR_BAD_SEQID:
1063 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1064 return;
1065 pr_warn_ratelimited("NFS: v4 server returned a bad"
1066 " sequence-id error on an"
1067 " unconfirmed sequence %p!\n",
1068 seqid->sequence);
1069 case -NFS4ERR_STALE_CLIENTID:
1070 case -NFS4ERR_STALE_STATEID:
1071 case -NFS4ERR_BAD_STATEID:
1072 case -NFS4ERR_BADXDR:
1073 case -NFS4ERR_RESOURCE:
1074 case -NFS4ERR_NOFILEHANDLE:
1075 /* Non-seqid mutating errors */
1076 return;
1077 };
1078 /*
1079 * Note: no locking needed as we are guaranteed to be first
1080 * on the sequence list
1081 */
1082 seqid->sequence->counter++;
1083 }
1084
1085 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1086 {
1087 struct nfs4_state_owner *sp;
1088
1089 if (seqid == NULL)
1090 return;
1091
1092 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1093 if (status == -NFS4ERR_BAD_SEQID)
1094 nfs4_drop_state_owner(sp);
1095 if (!nfs4_has_session(sp->so_server->nfs_client))
1096 nfs_increment_seqid(status, seqid);
1097 }
1098
1099 /*
1100 * Increment the seqid if the LOCK/LOCKU succeeded, or
1101 * failed with a seqid incrementing error -
1102 * see comments nfs4.h:seqid_mutating_error()
1103 */
1104 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1105 {
1106 if (seqid != NULL)
1107 nfs_increment_seqid(status, seqid);
1108 }
1109
1110 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1111 {
1112 struct nfs_seqid_counter *sequence;
1113 int status = 0;
1114
1115 if (seqid == NULL)
1116 goto out;
1117 sequence = seqid->sequence;
1118 spin_lock(&sequence->lock);
1119 seqid->task = task;
1120 if (list_empty(&seqid->list))
1121 list_add_tail(&seqid->list, &sequence->list);
1122 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1123 goto unlock;
1124 rpc_sleep_on(&sequence->wait, task, NULL);
1125 status = -EAGAIN;
1126 unlock:
1127 spin_unlock(&sequence->lock);
1128 out:
1129 return status;
1130 }
1131
1132 static int nfs4_run_state_manager(void *);
1133
1134 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1135 {
1136 smp_mb__before_atomic();
1137 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1138 smp_mb__after_atomic();
1139 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1140 rpc_wake_up(&clp->cl_rpcwaitq);
1141 }
1142
1143 /*
1144 * Schedule the nfs_client asynchronous state management routine
1145 */
1146 void nfs4_schedule_state_manager(struct nfs_client *clp)
1147 {
1148 struct task_struct *task;
1149 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1150
1151 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1152 return;
1153 __module_get(THIS_MODULE);
1154 atomic_inc(&clp->cl_count);
1155
1156 /* The rcu_read_lock() is not strictly necessary, as the state
1157 * manager is the only thread that ever changes the rpc_xprt
1158 * after it's initialized. At this point, we're single threaded. */
1159 rcu_read_lock();
1160 snprintf(buf, sizeof(buf), "%s-manager",
1161 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1162 rcu_read_unlock();
1163 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1164 if (IS_ERR(task)) {
1165 printk(KERN_ERR "%s: kthread_run: %ld\n",
1166 __func__, PTR_ERR(task));
1167 nfs4_clear_state_manager_bit(clp);
1168 nfs_put_client(clp);
1169 module_put(THIS_MODULE);
1170 }
1171 }
1172
1173 /*
1174 * Schedule a lease recovery attempt
1175 */
1176 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1177 {
1178 if (!clp)
1179 return;
1180 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1181 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1182 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1183 clp->cl_hostname);
1184 nfs4_schedule_state_manager(clp);
1185 }
1186 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1187
1188 /**
1189 * nfs4_schedule_migration_recovery - trigger migration recovery
1190 *
1191 * @server: FSID that is migrating
1192 *
1193 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1194 * value is returned.
1195 */
1196 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1197 {
1198 struct nfs_client *clp = server->nfs_client;
1199
1200 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1201 pr_err("NFS: volatile file handles not supported (server %s)\n",
1202 clp->cl_hostname);
1203 return -NFS4ERR_IO;
1204 }
1205
1206 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1207 return -NFS4ERR_IO;
1208
1209 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1210 __func__,
1211 (unsigned long long)server->fsid.major,
1212 (unsigned long long)server->fsid.minor,
1213 clp->cl_hostname);
1214
1215 set_bit(NFS_MIG_IN_TRANSITION,
1216 &((struct nfs_server *)server)->mig_status);
1217 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1218
1219 nfs4_schedule_state_manager(clp);
1220 return 0;
1221 }
1222 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1223
1224 /**
1225 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1226 *
1227 * @clp: server to check for moved leases
1228 *
1229 */
1230 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1231 {
1232 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1233 __func__, clp->cl_clientid, clp->cl_hostname);
1234
1235 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1236 nfs4_schedule_state_manager(clp);
1237 }
1238 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1239
1240 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1241 {
1242 int res;
1243
1244 might_sleep();
1245
1246 atomic_inc(&clp->cl_count);
1247 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1248 nfs_wait_bit_killable, TASK_KILLABLE);
1249 if (res)
1250 goto out;
1251 if (clp->cl_cons_state < 0)
1252 res = clp->cl_cons_state;
1253 out:
1254 nfs_put_client(clp);
1255 return res;
1256 }
1257
1258 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1259 {
1260 unsigned int loop;
1261 int ret;
1262
1263 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1264 ret = nfs4_wait_clnt_recover(clp);
1265 if (ret != 0)
1266 break;
1267 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1268 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1269 break;
1270 nfs4_schedule_state_manager(clp);
1271 ret = -EIO;
1272 }
1273 return ret;
1274 }
1275
1276 /*
1277 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1278 * @clp: client to process
1279 *
1280 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1281 * resend of the SETCLIENTID and hence re-establish the
1282 * callback channel. Then return all existing delegations.
1283 */
1284 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1285 {
1286 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1287 nfs_expire_all_delegations(clp);
1288 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1289 clp->cl_hostname);
1290 }
1291
1292 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1293 {
1294 nfs40_handle_cb_pathdown(clp);
1295 nfs4_schedule_state_manager(clp);
1296 }
1297
1298 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1299 {
1300
1301 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1302 /* Don't recover state that expired before the reboot */
1303 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1304 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1305 return 0;
1306 }
1307 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1308 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1309 return 1;
1310 }
1311
1312 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1313 {
1314 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1315 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1316 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1317 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1318 return 1;
1319 }
1320
1321 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1322 {
1323 struct nfs_client *clp = server->nfs_client;
1324
1325 if (!nfs4_valid_open_stateid(state))
1326 return -EBADF;
1327 nfs4_state_mark_reclaim_nograce(clp, state);
1328 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1329 clp->cl_hostname);
1330 nfs4_schedule_state_manager(clp);
1331 return 0;
1332 }
1333 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1334
1335 void nfs_inode_find_state_and_recover(struct inode *inode,
1336 const nfs4_stateid *stateid)
1337 {
1338 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1339 struct nfs_inode *nfsi = NFS_I(inode);
1340 struct nfs_open_context *ctx;
1341 struct nfs4_state *state;
1342 bool found = false;
1343
1344 spin_lock(&inode->i_lock);
1345 list_for_each_entry(ctx, &nfsi->open_files, list) {
1346 state = ctx->state;
1347 if (state == NULL)
1348 continue;
1349 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1350 continue;
1351 if (!nfs4_stateid_match(&state->stateid, stateid))
1352 continue;
1353 nfs4_state_mark_reclaim_nograce(clp, state);
1354 found = true;
1355 }
1356 spin_unlock(&inode->i_lock);
1357 if (found)
1358 nfs4_schedule_state_manager(clp);
1359 }
1360
1361 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1362 {
1363 struct inode *inode = state->inode;
1364 struct nfs_inode *nfsi = NFS_I(inode);
1365 struct nfs_open_context *ctx;
1366
1367 spin_lock(&inode->i_lock);
1368 list_for_each_entry(ctx, &nfsi->open_files, list) {
1369 if (ctx->state != state)
1370 continue;
1371 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1372 }
1373 spin_unlock(&inode->i_lock);
1374 }
1375
1376 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1377 {
1378 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1379 nfs4_state_mark_open_context_bad(state);
1380 }
1381
1382
1383 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1384 {
1385 struct inode *inode = state->inode;
1386 struct nfs_inode *nfsi = NFS_I(inode);
1387 struct file_lock *fl;
1388 int status = 0;
1389 struct file_lock_context *flctx = inode->i_flctx;
1390 struct list_head *list;
1391
1392 if (flctx == NULL)
1393 return 0;
1394
1395 list = &flctx->flc_posix;
1396
1397 /* Guard against delegation returns and new lock/unlock calls */
1398 down_write(&nfsi->rwsem);
1399 spin_lock(&flctx->flc_lock);
1400 restart:
1401 list_for_each_entry(fl, list, fl_list) {
1402 if (nfs_file_open_context(fl->fl_file)->state != state)
1403 continue;
1404 spin_unlock(&flctx->flc_lock);
1405 status = ops->recover_lock(state, fl);
1406 switch (status) {
1407 case 0:
1408 break;
1409 case -ESTALE:
1410 case -NFS4ERR_ADMIN_REVOKED:
1411 case -NFS4ERR_STALE_STATEID:
1412 case -NFS4ERR_BAD_STATEID:
1413 case -NFS4ERR_EXPIRED:
1414 case -NFS4ERR_NO_GRACE:
1415 case -NFS4ERR_STALE_CLIENTID:
1416 case -NFS4ERR_BADSESSION:
1417 case -NFS4ERR_BADSLOT:
1418 case -NFS4ERR_BAD_HIGH_SLOT:
1419 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1420 goto out;
1421 default:
1422 pr_err("NFS: %s: unhandled error %d\n",
1423 __func__, status);
1424 case -ENOMEM:
1425 case -NFS4ERR_DENIED:
1426 case -NFS4ERR_RECLAIM_BAD:
1427 case -NFS4ERR_RECLAIM_CONFLICT:
1428 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1429 status = 0;
1430 }
1431 spin_lock(&flctx->flc_lock);
1432 }
1433 if (list == &flctx->flc_posix) {
1434 list = &flctx->flc_flock;
1435 goto restart;
1436 }
1437 spin_unlock(&flctx->flc_lock);
1438 out:
1439 up_write(&nfsi->rwsem);
1440 return status;
1441 }
1442
1443 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1444 {
1445 struct nfs4_state *state;
1446 struct nfs4_lock_state *lock;
1447 int status = 0;
1448
1449 /* Note: we rely on the sp->so_states list being ordered
1450 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1451 * states first.
1452 * This is needed to ensure that the server won't give us any
1453 * read delegations that we have to return if, say, we are
1454 * recovering after a network partition or a reboot from a
1455 * server that doesn't support a grace period.
1456 */
1457 spin_lock(&sp->so_lock);
1458 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1459 restart:
1460 list_for_each_entry(state, &sp->so_states, open_states) {
1461 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1462 continue;
1463 if (!nfs4_valid_open_stateid(state))
1464 continue;
1465 if (state->state == 0)
1466 continue;
1467 atomic_inc(&state->count);
1468 spin_unlock(&sp->so_lock);
1469 status = ops->recover_open(sp, state);
1470 if (status >= 0) {
1471 status = nfs4_reclaim_locks(state, ops);
1472 if (status >= 0) {
1473 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1474 spin_lock(&state->state_lock);
1475 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1476 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1477 pr_warn_ratelimited("NFS: "
1478 "%s: Lock reclaim "
1479 "failed!\n", __func__);
1480 }
1481 spin_unlock(&state->state_lock);
1482 }
1483 nfs4_put_open_state(state);
1484 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1485 &state->flags);
1486 spin_lock(&sp->so_lock);
1487 goto restart;
1488 }
1489 }
1490 switch (status) {
1491 default:
1492 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1493 __func__, status);
1494 case -ENOENT:
1495 case -ENOMEM:
1496 case -ESTALE:
1497 /* Open state on this file cannot be recovered */
1498 nfs4_state_mark_recovery_failed(state, status);
1499 break;
1500 case -EAGAIN:
1501 ssleep(1);
1502 case -NFS4ERR_ADMIN_REVOKED:
1503 case -NFS4ERR_STALE_STATEID:
1504 case -NFS4ERR_BAD_STATEID:
1505 case -NFS4ERR_RECLAIM_BAD:
1506 case -NFS4ERR_RECLAIM_CONFLICT:
1507 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1508 break;
1509 case -NFS4ERR_EXPIRED:
1510 case -NFS4ERR_NO_GRACE:
1511 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1512 case -NFS4ERR_STALE_CLIENTID:
1513 case -NFS4ERR_BADSESSION:
1514 case -NFS4ERR_BADSLOT:
1515 case -NFS4ERR_BAD_HIGH_SLOT:
1516 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1517 goto out_err;
1518 }
1519 nfs4_put_open_state(state);
1520 spin_lock(&sp->so_lock);
1521 goto restart;
1522 }
1523 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1524 spin_unlock(&sp->so_lock);
1525 return 0;
1526 out_err:
1527 nfs4_put_open_state(state);
1528 spin_lock(&sp->so_lock);
1529 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1530 spin_unlock(&sp->so_lock);
1531 return status;
1532 }
1533
1534 static void nfs4_clear_open_state(struct nfs4_state *state)
1535 {
1536 struct nfs4_lock_state *lock;
1537
1538 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1539 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1540 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1541 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1542 spin_lock(&state->state_lock);
1543 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1544 lock->ls_seqid.flags = 0;
1545 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1546 }
1547 spin_unlock(&state->state_lock);
1548 }
1549
1550 static void nfs4_reset_seqids(struct nfs_server *server,
1551 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1552 {
1553 struct nfs_client *clp = server->nfs_client;
1554 struct nfs4_state_owner *sp;
1555 struct rb_node *pos;
1556 struct nfs4_state *state;
1557
1558 spin_lock(&clp->cl_lock);
1559 for (pos = rb_first(&server->state_owners);
1560 pos != NULL;
1561 pos = rb_next(pos)) {
1562 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1563 sp->so_seqid.flags = 0;
1564 spin_lock(&sp->so_lock);
1565 list_for_each_entry(state, &sp->so_states, open_states) {
1566 if (mark_reclaim(clp, state))
1567 nfs4_clear_open_state(state);
1568 }
1569 spin_unlock(&sp->so_lock);
1570 }
1571 spin_unlock(&clp->cl_lock);
1572 }
1573
1574 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1575 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1576 {
1577 struct nfs_server *server;
1578
1579 rcu_read_lock();
1580 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1581 nfs4_reset_seqids(server, mark_reclaim);
1582 rcu_read_unlock();
1583 }
1584
1585 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1586 {
1587 /* Mark all delegations for reclaim */
1588 nfs_delegation_mark_reclaim(clp);
1589 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1590 }
1591
1592 static void nfs4_reclaim_complete(struct nfs_client *clp,
1593 const struct nfs4_state_recovery_ops *ops,
1594 struct rpc_cred *cred)
1595 {
1596 /* Notify the server we're done reclaiming our state */
1597 if (ops->reclaim_complete)
1598 (void)ops->reclaim_complete(clp, cred);
1599 }
1600
1601 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1602 {
1603 struct nfs_client *clp = server->nfs_client;
1604 struct nfs4_state_owner *sp;
1605 struct rb_node *pos;
1606 struct nfs4_state *state;
1607
1608 spin_lock(&clp->cl_lock);
1609 for (pos = rb_first(&server->state_owners);
1610 pos != NULL;
1611 pos = rb_next(pos)) {
1612 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1613 spin_lock(&sp->so_lock);
1614 list_for_each_entry(state, &sp->so_states, open_states) {
1615 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1616 &state->flags))
1617 continue;
1618 nfs4_state_mark_reclaim_nograce(clp, state);
1619 }
1620 spin_unlock(&sp->so_lock);
1621 }
1622 spin_unlock(&clp->cl_lock);
1623 }
1624
1625 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1626 {
1627 struct nfs_server *server;
1628
1629 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1630 return 0;
1631
1632 rcu_read_lock();
1633 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1634 nfs4_clear_reclaim_server(server);
1635 rcu_read_unlock();
1636
1637 nfs_delegation_reap_unclaimed(clp);
1638 return 1;
1639 }
1640
1641 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1642 {
1643 const struct nfs4_state_recovery_ops *ops;
1644 struct rpc_cred *cred;
1645
1646 if (!nfs4_state_clear_reclaim_reboot(clp))
1647 return;
1648 ops = clp->cl_mvops->reboot_recovery_ops;
1649 cred = nfs4_get_clid_cred(clp);
1650 nfs4_reclaim_complete(clp, ops, cred);
1651 put_rpccred(cred);
1652 }
1653
1654 static void nfs_delegation_clear_all(struct nfs_client *clp)
1655 {
1656 nfs_delegation_mark_reclaim(clp);
1657 nfs_delegation_reap_unclaimed(clp);
1658 }
1659
1660 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1661 {
1662 nfs_delegation_clear_all(clp);
1663 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1664 }
1665
1666 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1667 {
1668 switch (error) {
1669 case 0:
1670 break;
1671 case -NFS4ERR_CB_PATH_DOWN:
1672 nfs40_handle_cb_pathdown(clp);
1673 break;
1674 case -NFS4ERR_NO_GRACE:
1675 nfs4_state_end_reclaim_reboot(clp);
1676 break;
1677 case -NFS4ERR_STALE_CLIENTID:
1678 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1679 nfs4_state_clear_reclaim_reboot(clp);
1680 nfs4_state_start_reclaim_reboot(clp);
1681 break;
1682 case -NFS4ERR_EXPIRED:
1683 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1684 nfs4_state_start_reclaim_nograce(clp);
1685 break;
1686 case -NFS4ERR_BADSESSION:
1687 case -NFS4ERR_BADSLOT:
1688 case -NFS4ERR_BAD_HIGH_SLOT:
1689 case -NFS4ERR_DEADSESSION:
1690 case -NFS4ERR_SEQ_FALSE_RETRY:
1691 case -NFS4ERR_SEQ_MISORDERED:
1692 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1693 /* Zero session reset errors */
1694 break;
1695 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1696 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1697 break;
1698 default:
1699 dprintk("%s: failed to handle error %d for server %s\n",
1700 __func__, error, clp->cl_hostname);
1701 return error;
1702 }
1703 dprintk("%s: handled error %d for server %s\n", __func__, error,
1704 clp->cl_hostname);
1705 return 0;
1706 }
1707
1708 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1709 {
1710 struct nfs4_state_owner *sp;
1711 struct nfs_server *server;
1712 struct rb_node *pos;
1713 int status = 0;
1714
1715 restart:
1716 rcu_read_lock();
1717 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1718 nfs4_purge_state_owners(server);
1719 spin_lock(&clp->cl_lock);
1720 for (pos = rb_first(&server->state_owners);
1721 pos != NULL;
1722 pos = rb_next(pos)) {
1723 sp = rb_entry(pos,
1724 struct nfs4_state_owner, so_server_node);
1725 if (!test_and_clear_bit(ops->owner_flag_bit,
1726 &sp->so_flags))
1727 continue;
1728 if (!atomic_inc_not_zero(&sp->so_count))
1729 continue;
1730 spin_unlock(&clp->cl_lock);
1731 rcu_read_unlock();
1732
1733 status = nfs4_reclaim_open_state(sp, ops);
1734 if (status < 0) {
1735 set_bit(ops->owner_flag_bit, &sp->so_flags);
1736 nfs4_put_state_owner(sp);
1737 status = nfs4_recovery_handle_error(clp, status);
1738 return (status != 0) ? status : -EAGAIN;
1739 }
1740
1741 nfs4_put_state_owner(sp);
1742 goto restart;
1743 }
1744 spin_unlock(&clp->cl_lock);
1745 }
1746 rcu_read_unlock();
1747 return 0;
1748 }
1749
1750 static int nfs4_check_lease(struct nfs_client *clp)
1751 {
1752 struct rpc_cred *cred;
1753 const struct nfs4_state_maintenance_ops *ops =
1754 clp->cl_mvops->state_renewal_ops;
1755 int status;
1756
1757 /* Is the client already known to have an expired lease? */
1758 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1759 return 0;
1760 spin_lock(&clp->cl_lock);
1761 cred = ops->get_state_renewal_cred_locked(clp);
1762 spin_unlock(&clp->cl_lock);
1763 if (cred == NULL) {
1764 cred = nfs4_get_clid_cred(clp);
1765 status = -ENOKEY;
1766 if (cred == NULL)
1767 goto out;
1768 }
1769 status = ops->renew_lease(clp, cred);
1770 put_rpccred(cred);
1771 if (status == -ETIMEDOUT) {
1772 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1773 return 0;
1774 }
1775 out:
1776 return nfs4_recovery_handle_error(clp, status);
1777 }
1778
1779 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1780 * and for recoverable errors on EXCHANGE_ID for v4.1
1781 */
1782 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1783 {
1784 switch (status) {
1785 case -NFS4ERR_SEQ_MISORDERED:
1786 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1787 return -ESERVERFAULT;
1788 /* Lease confirmation error: retry after purging the lease */
1789 ssleep(1);
1790 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1791 break;
1792 case -NFS4ERR_STALE_CLIENTID:
1793 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1794 nfs4_state_start_reclaim_reboot(clp);
1795 break;
1796 case -NFS4ERR_CLID_INUSE:
1797 pr_err("NFS: Server %s reports our clientid is in use\n",
1798 clp->cl_hostname);
1799 nfs_mark_client_ready(clp, -EPERM);
1800 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1801 return -EPERM;
1802 case -EACCES:
1803 case -NFS4ERR_DELAY:
1804 case -ETIMEDOUT:
1805 case -EAGAIN:
1806 ssleep(1);
1807 break;
1808
1809 case -NFS4ERR_MINOR_VERS_MISMATCH:
1810 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1811 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1812 dprintk("%s: exit with error %d for server %s\n",
1813 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1814 return -EPROTONOSUPPORT;
1815 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1816 * in nfs4_exchange_id */
1817 default:
1818 dprintk("%s: exit with error %d for server %s\n", __func__,
1819 status, clp->cl_hostname);
1820 return status;
1821 }
1822 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1823 dprintk("%s: handled error %d for server %s\n", __func__, status,
1824 clp->cl_hostname);
1825 return 0;
1826 }
1827
1828 static int nfs4_establish_lease(struct nfs_client *clp)
1829 {
1830 struct rpc_cred *cred;
1831 const struct nfs4_state_recovery_ops *ops =
1832 clp->cl_mvops->reboot_recovery_ops;
1833 int status;
1834
1835 nfs4_begin_drain_session(clp);
1836 cred = nfs4_get_clid_cred(clp);
1837 if (cred == NULL)
1838 return -ENOENT;
1839 status = ops->establish_clid(clp, cred);
1840 put_rpccred(cred);
1841 if (status != 0)
1842 return status;
1843 pnfs_destroy_all_layouts(clp);
1844 return 0;
1845 }
1846
1847 /*
1848 * Returns zero or a negative errno. NFS4ERR values are converted
1849 * to local errno values.
1850 */
1851 static int nfs4_reclaim_lease(struct nfs_client *clp)
1852 {
1853 int status;
1854
1855 status = nfs4_establish_lease(clp);
1856 if (status < 0)
1857 return nfs4_handle_reclaim_lease_error(clp, status);
1858 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1859 nfs4_state_start_reclaim_nograce(clp);
1860 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1861 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1862 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1863 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1864 return 0;
1865 }
1866
1867 static int nfs4_purge_lease(struct nfs_client *clp)
1868 {
1869 int status;
1870
1871 status = nfs4_establish_lease(clp);
1872 if (status < 0)
1873 return nfs4_handle_reclaim_lease_error(clp, status);
1874 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1875 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1876 nfs4_state_start_reclaim_nograce(clp);
1877 return 0;
1878 }
1879
1880 /*
1881 * Try remote migration of one FSID from a source server to a
1882 * destination server. The source server provides a list of
1883 * potential destinations.
1884 *
1885 * Returns zero or a negative NFS4ERR status code.
1886 */
1887 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1888 {
1889 struct nfs_client *clp = server->nfs_client;
1890 struct nfs4_fs_locations *locations = NULL;
1891 struct inode *inode;
1892 struct page *page;
1893 int status, result;
1894
1895 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1896 (unsigned long long)server->fsid.major,
1897 (unsigned long long)server->fsid.minor,
1898 clp->cl_hostname);
1899
1900 result = 0;
1901 page = alloc_page(GFP_KERNEL);
1902 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1903 if (page == NULL || locations == NULL) {
1904 dprintk("<-- %s: no memory\n", __func__);
1905 goto out;
1906 }
1907
1908 inode = d_inode(server->super->s_root);
1909 result = nfs4_proc_get_locations(inode, locations, page, cred);
1910 if (result) {
1911 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1912 __func__, result);
1913 goto out;
1914 }
1915
1916 result = -NFS4ERR_NXIO;
1917 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1918 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1919 __func__);
1920 goto out;
1921 }
1922
1923 nfs4_begin_drain_session(clp);
1924
1925 status = nfs4_replace_transport(server, locations);
1926 if (status != 0) {
1927 dprintk("<-- %s: failed to replace transport: %d\n",
1928 __func__, status);
1929 goto out;
1930 }
1931
1932 result = 0;
1933 dprintk("<-- %s: migration succeeded\n", __func__);
1934
1935 out:
1936 if (page != NULL)
1937 __free_page(page);
1938 kfree(locations);
1939 if (result) {
1940 pr_err("NFS: migration recovery failed (server %s)\n",
1941 clp->cl_hostname);
1942 set_bit(NFS_MIG_FAILED, &server->mig_status);
1943 }
1944 return result;
1945 }
1946
1947 /*
1948 * Returns zero or a negative NFS4ERR status code.
1949 */
1950 static int nfs4_handle_migration(struct nfs_client *clp)
1951 {
1952 const struct nfs4_state_maintenance_ops *ops =
1953 clp->cl_mvops->state_renewal_ops;
1954 struct nfs_server *server;
1955 struct rpc_cred *cred;
1956
1957 dprintk("%s: migration reported on \"%s\"\n", __func__,
1958 clp->cl_hostname);
1959
1960 spin_lock(&clp->cl_lock);
1961 cred = ops->get_state_renewal_cred_locked(clp);
1962 spin_unlock(&clp->cl_lock);
1963 if (cred == NULL)
1964 return -NFS4ERR_NOENT;
1965
1966 clp->cl_mig_gen++;
1967 restart:
1968 rcu_read_lock();
1969 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1970 int status;
1971
1972 if (server->mig_gen == clp->cl_mig_gen)
1973 continue;
1974 server->mig_gen = clp->cl_mig_gen;
1975
1976 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
1977 &server->mig_status))
1978 continue;
1979
1980 rcu_read_unlock();
1981 status = nfs4_try_migration(server, cred);
1982 if (status < 0) {
1983 put_rpccred(cred);
1984 return status;
1985 }
1986 goto restart;
1987 }
1988 rcu_read_unlock();
1989 put_rpccred(cred);
1990 return 0;
1991 }
1992
1993 /*
1994 * Test each nfs_server on the clp's cl_superblocks list to see
1995 * if it's moved to another server. Stop when the server no longer
1996 * returns NFS4ERR_LEASE_MOVED.
1997 */
1998 static int nfs4_handle_lease_moved(struct nfs_client *clp)
1999 {
2000 const struct nfs4_state_maintenance_ops *ops =
2001 clp->cl_mvops->state_renewal_ops;
2002 struct nfs_server *server;
2003 struct rpc_cred *cred;
2004
2005 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2006 clp->cl_hostname);
2007
2008 spin_lock(&clp->cl_lock);
2009 cred = ops->get_state_renewal_cred_locked(clp);
2010 spin_unlock(&clp->cl_lock);
2011 if (cred == NULL)
2012 return -NFS4ERR_NOENT;
2013
2014 clp->cl_mig_gen++;
2015 restart:
2016 rcu_read_lock();
2017 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2018 struct inode *inode;
2019 int status;
2020
2021 if (server->mig_gen == clp->cl_mig_gen)
2022 continue;
2023 server->mig_gen = clp->cl_mig_gen;
2024
2025 rcu_read_unlock();
2026
2027 inode = d_inode(server->super->s_root);
2028 status = nfs4_proc_fsid_present(inode, cred);
2029 if (status != -NFS4ERR_MOVED)
2030 goto restart; /* wasn't this one */
2031 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2032 goto restart; /* there are more */
2033 goto out;
2034 }
2035 rcu_read_unlock();
2036
2037 out:
2038 put_rpccred(cred);
2039 return 0;
2040 }
2041
2042 /**
2043 * nfs4_discover_server_trunking - Detect server IP address trunking
2044 *
2045 * @clp: nfs_client under test
2046 * @result: OUT: found nfs_client, or clp
2047 *
2048 * Returns zero or a negative errno. If zero is returned,
2049 * an nfs_client pointer is planted in "result".
2050 *
2051 * Note: since we are invoked in process context, and
2052 * not from inside the state manager, we cannot use
2053 * nfs4_handle_reclaim_lease_error().
2054 */
2055 int nfs4_discover_server_trunking(struct nfs_client *clp,
2056 struct nfs_client **result)
2057 {
2058 const struct nfs4_state_recovery_ops *ops =
2059 clp->cl_mvops->reboot_recovery_ops;
2060 struct rpc_clnt *clnt;
2061 struct rpc_cred *cred;
2062 int i, status;
2063
2064 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2065
2066 clnt = clp->cl_rpcclient;
2067 i = 0;
2068
2069 mutex_lock(&nfs_clid_init_mutex);
2070 again:
2071 status = -ENOENT;
2072 cred = nfs4_get_clid_cred(clp);
2073 if (cred == NULL)
2074 goto out_unlock;
2075
2076 status = ops->detect_trunking(clp, result, cred);
2077 put_rpccred(cred);
2078 switch (status) {
2079 case 0:
2080 break;
2081 case -ETIMEDOUT:
2082 if (clnt->cl_softrtry)
2083 break;
2084 case -NFS4ERR_DELAY:
2085 case -EAGAIN:
2086 ssleep(1);
2087 case -NFS4ERR_STALE_CLIENTID:
2088 dprintk("NFS: %s after status %d, retrying\n",
2089 __func__, status);
2090 goto again;
2091 case -EACCES:
2092 if (i++ == 0) {
2093 nfs4_root_machine_cred(clp);
2094 goto again;
2095 }
2096 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2097 break;
2098 case -NFS4ERR_CLID_INUSE:
2099 case -NFS4ERR_WRONGSEC:
2100 /* No point in retrying if we already used RPC_AUTH_UNIX */
2101 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2102 status = -EPERM;
2103 break;
2104 }
2105 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2106 if (IS_ERR(clnt)) {
2107 status = PTR_ERR(clnt);
2108 break;
2109 }
2110 /* Note: this is safe because we haven't yet marked the
2111 * client as ready, so we are the only user of
2112 * clp->cl_rpcclient
2113 */
2114 clnt = xchg(&clp->cl_rpcclient, clnt);
2115 rpc_shutdown_client(clnt);
2116 clnt = clp->cl_rpcclient;
2117 goto again;
2118
2119 case -NFS4ERR_MINOR_VERS_MISMATCH:
2120 status = -EPROTONOSUPPORT;
2121 break;
2122
2123 case -EKEYEXPIRED:
2124 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2125 * in nfs4_exchange_id */
2126 status = -EKEYEXPIRED;
2127 break;
2128 default:
2129 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2130 __func__, status);
2131 status = -EIO;
2132 }
2133
2134 out_unlock:
2135 mutex_unlock(&nfs_clid_init_mutex);
2136 dprintk("NFS: %s: status = %d\n", __func__, status);
2137 return status;
2138 }
2139
2140 #ifdef CONFIG_NFS_V4_1
2141 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2142 {
2143 struct nfs_client *clp = session->clp;
2144
2145 switch (err) {
2146 default:
2147 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2148 break;
2149 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2150 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2151 }
2152 nfs4_schedule_lease_recovery(clp);
2153 }
2154 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2155
2156 void nfs41_notify_server(struct nfs_client *clp)
2157 {
2158 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2159 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2160 nfs4_schedule_state_manager(clp);
2161 }
2162
2163 static void nfs4_reset_all_state(struct nfs_client *clp)
2164 {
2165 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2166 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2167 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2168 nfs4_state_start_reclaim_nograce(clp);
2169 dprintk("%s: scheduling reset of all state for server %s!\n",
2170 __func__, clp->cl_hostname);
2171 nfs4_schedule_state_manager(clp);
2172 }
2173 }
2174
2175 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2176 {
2177 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2178 nfs4_state_start_reclaim_reboot(clp);
2179 dprintk("%s: server %s rebooted!\n", __func__,
2180 clp->cl_hostname);
2181 nfs4_schedule_state_manager(clp);
2182 }
2183 }
2184
2185 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2186 {
2187 nfs4_reset_all_state(clp);
2188 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2189 }
2190
2191 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2192 {
2193 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
2194 nfs4_schedule_state_manager(clp);
2195
2196 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2197 }
2198
2199 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2200 {
2201 /* FIXME: For now, we destroy all layouts. */
2202 pnfs_destroy_all_layouts(clp);
2203 /* FIXME: For now, we test all delegations+open state+locks. */
2204 nfs41_handle_some_state_revoked(clp);
2205 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2206 clp->cl_hostname);
2207 }
2208
2209 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2210 {
2211 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2212 nfs4_schedule_state_manager(clp);
2213
2214 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2215 clp->cl_hostname);
2216 }
2217
2218 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2219 {
2220 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2221 &clp->cl_state) == 0)
2222 nfs4_schedule_state_manager(clp);
2223 }
2224
2225 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2226 {
2227 if (!flags)
2228 return;
2229
2230 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2231 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2232
2233 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2234 nfs41_handle_server_reboot(clp);
2235 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2236 nfs41_handle_all_state_revoked(clp);
2237 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2238 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2239 nfs41_handle_some_state_revoked(clp);
2240 if (flags & SEQ4_STATUS_LEASE_MOVED)
2241 nfs4_schedule_lease_moved_recovery(clp);
2242 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2243 nfs41_handle_recallable_state_revoked(clp);
2244 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2245 nfs41_handle_backchannel_fault(clp);
2246 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2247 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2248 nfs41_handle_cb_path_down(clp);
2249 }
2250
2251 static int nfs4_reset_session(struct nfs_client *clp)
2252 {
2253 struct rpc_cred *cred;
2254 int status;
2255
2256 if (!nfs4_has_session(clp))
2257 return 0;
2258 nfs4_begin_drain_session(clp);
2259 cred = nfs4_get_clid_cred(clp);
2260 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2261 switch (status) {
2262 case 0:
2263 case -NFS4ERR_BADSESSION:
2264 case -NFS4ERR_DEADSESSION:
2265 break;
2266 case -NFS4ERR_BACK_CHAN_BUSY:
2267 case -NFS4ERR_DELAY:
2268 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2269 status = 0;
2270 ssleep(1);
2271 goto out;
2272 default:
2273 status = nfs4_recovery_handle_error(clp, status);
2274 goto out;
2275 }
2276
2277 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2278 status = nfs4_proc_create_session(clp, cred);
2279 if (status) {
2280 dprintk("%s: session reset failed with status %d for server %s!\n",
2281 __func__, status, clp->cl_hostname);
2282 status = nfs4_handle_reclaim_lease_error(clp, status);
2283 goto out;
2284 }
2285 nfs41_finish_session_reset(clp);
2286 dprintk("%s: session reset was successful for server %s!\n",
2287 __func__, clp->cl_hostname);
2288 out:
2289 if (cred)
2290 put_rpccred(cred);
2291 return status;
2292 }
2293
2294 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2295 {
2296 struct rpc_cred *cred;
2297 int ret;
2298
2299 if (!nfs4_has_session(clp))
2300 return 0;
2301 nfs4_begin_drain_session(clp);
2302 cred = nfs4_get_clid_cred(clp);
2303 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2304 if (cred)
2305 put_rpccred(cred);
2306 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2307 switch (ret) {
2308 case 0:
2309 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2310 __func__, clp->cl_hostname);
2311 break;
2312 case -NFS4ERR_DELAY:
2313 ssleep(1);
2314 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2315 break;
2316 default:
2317 return nfs4_recovery_handle_error(clp, ret);
2318 }
2319 return 0;
2320 }
2321 #else /* CONFIG_NFS_V4_1 */
2322 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2323
2324 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2325 {
2326 return 0;
2327 }
2328 #endif /* CONFIG_NFS_V4_1 */
2329
2330 static void nfs4_state_manager(struct nfs_client *clp)
2331 {
2332 int status = 0;
2333 const char *section = "", *section_sep = "";
2334
2335 /* Ensure exclusive access to NFSv4 state */
2336 do {
2337 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2338 section = "purge state";
2339 status = nfs4_purge_lease(clp);
2340 if (status < 0)
2341 goto out_error;
2342 continue;
2343 }
2344
2345 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2346 section = "lease expired";
2347 /* We're going to have to re-establish a clientid */
2348 status = nfs4_reclaim_lease(clp);
2349 if (status < 0)
2350 goto out_error;
2351 continue;
2352 }
2353
2354 /* Initialize or reset the session */
2355 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2356 section = "reset session";
2357 status = nfs4_reset_session(clp);
2358 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2359 continue;
2360 if (status < 0)
2361 goto out_error;
2362 }
2363
2364 /* Send BIND_CONN_TO_SESSION */
2365 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2366 &clp->cl_state)) {
2367 section = "bind conn to session";
2368 status = nfs4_bind_conn_to_session(clp);
2369 if (status < 0)
2370 goto out_error;
2371 continue;
2372 }
2373
2374 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2375 section = "check lease";
2376 status = nfs4_check_lease(clp);
2377 if (status < 0)
2378 goto out_error;
2379 continue;
2380 }
2381
2382 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2383 section = "migration";
2384 status = nfs4_handle_migration(clp);
2385 if (status < 0)
2386 goto out_error;
2387 }
2388
2389 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2390 section = "lease moved";
2391 status = nfs4_handle_lease_moved(clp);
2392 if (status < 0)
2393 goto out_error;
2394 }
2395
2396 /* First recover reboot state... */
2397 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2398 section = "reclaim reboot";
2399 status = nfs4_do_reclaim(clp,
2400 clp->cl_mvops->reboot_recovery_ops);
2401 if (status == -EAGAIN)
2402 continue;
2403 if (status < 0)
2404 goto out_error;
2405 nfs4_state_end_reclaim_reboot(clp);
2406 }
2407
2408 /* Now recover expired state... */
2409 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2410 section = "reclaim nograce";
2411 status = nfs4_do_reclaim(clp,
2412 clp->cl_mvops->nograce_recovery_ops);
2413 if (status == -EAGAIN)
2414 continue;
2415 if (status < 0)
2416 goto out_error;
2417 }
2418
2419 nfs4_end_drain_session(clp);
2420 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2421 nfs_client_return_marked_delegations(clp);
2422 continue;
2423 }
2424
2425 nfs4_clear_state_manager_bit(clp);
2426 /* Did we race with an attempt to give us more work? */
2427 if (clp->cl_state == 0)
2428 break;
2429 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2430 break;
2431 } while (atomic_read(&clp->cl_count) > 1);
2432 return;
2433 out_error:
2434 if (strlen(section))
2435 section_sep = ": ";
2436 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2437 " with error %d\n", section_sep, section,
2438 clp->cl_hostname, -status);
2439 ssleep(1);
2440 nfs4_end_drain_session(clp);
2441 nfs4_clear_state_manager_bit(clp);
2442 }
2443
2444 static int nfs4_run_state_manager(void *ptr)
2445 {
2446 struct nfs_client *clp = ptr;
2447
2448 allow_signal(SIGKILL);
2449 nfs4_state_manager(clp);
2450 nfs_put_client(clp);
2451 module_put_and_exit(0);
2452 return 0;
2453 }
2454
2455 /*
2456 * Local variables:
2457 * c-basic-offset: 8
2458 * End:
2459 */
CRIS linux kernel tree