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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-stable.git] / fs / nfs / nfs4state.c
blobcada00aa5096d7dbd57a0b8717d1a6583abbbfa7
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 { .data = { 0 } },
70 .type = NFS4_SPECIAL_STATEID_TYPE,
71 };
72 static DEFINE_MUTEX(nfs_clid_init_mutex);
73
74 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
75 {
76 struct nfs4_setclientid_res clid = {
77 .clientid = clp->cl_clientid,
78 .confirm = clp->cl_confirm,
79 };
80 unsigned short port;
81 int status;
82 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
83
84 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
85 goto do_confirm;
86 port = nn->nfs_callback_tcpport;
87 if (clp->cl_addr.ss_family == AF_INET6)
88 port = nn->nfs_callback_tcpport6;
89
90 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
91 if (status != 0)
92 goto out;
93 clp->cl_clientid = clid.clientid;
94 clp->cl_confirm = clid.confirm;
95 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
96 do_confirm:
97 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
98 if (status != 0)
99 goto out;
100 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
101 nfs4_schedule_state_renewal(clp);
102 out:
103 return status;
104 }
105
106 /**
107 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
108 *
109 * @clp: nfs_client under test
110 * @result: OUT: found nfs_client, or clp
111 * @cred: credential to use for trunking test
112 *
113 * Returns zero, a negative errno, or a negative NFS4ERR status.
114 * If zero is returned, an nfs_client pointer is planted in
115 * "result".
116 *
117 * Note: The returned client may not yet be marked ready.
118 */
119 int nfs40_discover_server_trunking(struct nfs_client *clp,
120 struct nfs_client **result,
121 struct rpc_cred *cred)
122 {
123 struct nfs4_setclientid_res clid = {
124 .clientid = clp->cl_clientid,
125 .confirm = clp->cl_confirm,
126 };
127 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
128 unsigned short port;
129 int status;
130
131 port = nn->nfs_callback_tcpport;
132 if (clp->cl_addr.ss_family == AF_INET6)
133 port = nn->nfs_callback_tcpport6;
134
135 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
136 if (status != 0)
137 goto out;
138 clp->cl_clientid = clid.clientid;
139 clp->cl_confirm = clid.confirm;
140
141 status = nfs40_walk_client_list(clp, result, cred);
142 if (status == 0) {
143 /* Sustain the lease, even if it's empty. If the clientid4
144 * goes stale it's of no use for trunking discovery. */
145 nfs4_schedule_state_renewal(*result);
146 }
147 out:
148 return status;
149 }
150
151 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
152 {
153 struct rpc_cred *cred = NULL;
154
155 if (clp->cl_machine_cred != NULL)
156 cred = get_rpccred(clp->cl_machine_cred);
157 return cred;
158 }
159
160 static void nfs4_root_machine_cred(struct nfs_client *clp)
161 {
162 struct rpc_cred *cred, *new;
163
164 new = rpc_lookup_machine_cred(NULL);
165 spin_lock(&clp->cl_lock);
166 cred = clp->cl_machine_cred;
167 clp->cl_machine_cred = new;
168 spin_unlock(&clp->cl_lock);
169 if (cred != NULL)
170 put_rpccred(cred);
171 }
172
173 static struct rpc_cred *
174 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
175 {
176 struct rpc_cred *cred = NULL;
177 struct nfs4_state_owner *sp;
178 struct rb_node *pos;
179
180 for (pos = rb_first(&server->state_owners);
181 pos != NULL;
182 pos = rb_next(pos)) {
183 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
184 if (list_empty(&sp->so_states))
185 continue;
186 cred = get_rpccred(sp->so_cred);
187 break;
188 }
189 return cred;
190 }
191
192 /**
193 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
194 * @clp: client state handle
195 *
196 * Returns an rpc_cred with reference count bumped, or NULL.
197 * Caller must hold clp->cl_lock.
198 */
199 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
200 {
201 struct rpc_cred *cred = NULL;
202 struct nfs_server *server;
203
204 /* Use machine credentials if available */
205 cred = nfs4_get_machine_cred_locked(clp);
206 if (cred != NULL)
207 goto out;
208
209 rcu_read_lock();
210 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
211 cred = nfs4_get_renew_cred_server_locked(server);
212 if (cred != NULL)
213 break;
214 }
215 rcu_read_unlock();
216
217 out:
218 return cred;
219 }
220
221 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
222 {
223 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
224 spin_lock(&tbl->slot_tbl_lock);
225 nfs41_wake_slot_table(tbl);
226 spin_unlock(&tbl->slot_tbl_lock);
227 }
228 }
229
230 static void nfs4_end_drain_session(struct nfs_client *clp)
231 {
232 struct nfs4_session *ses = clp->cl_session;
233
234 if (clp->cl_slot_tbl) {
235 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
236 return;
237 }
238
239 if (ses != NULL) {
240 nfs4_end_drain_slot_table(&ses->bc_slot_table);
241 nfs4_end_drain_slot_table(&ses->fc_slot_table);
242 }
243 }
244
245 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
246 {
247 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
248 spin_lock(&tbl->slot_tbl_lock);
249 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
250 reinit_completion(&tbl->complete);
251 spin_unlock(&tbl->slot_tbl_lock);
252 return wait_for_completion_interruptible(&tbl->complete);
253 }
254 spin_unlock(&tbl->slot_tbl_lock);
255 return 0;
256 }
257
258 static int nfs4_begin_drain_session(struct nfs_client *clp)
259 {
260 struct nfs4_session *ses = clp->cl_session;
261 int ret = 0;
262
263 if (clp->cl_slot_tbl)
264 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
265
266 /* back channel */
267 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
268 if (ret)
269 return ret;
270 /* fore channel */
271 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
272 }
273
274 #if defined(CONFIG_NFS_V4_1)
275
276 static int nfs41_setup_state_renewal(struct nfs_client *clp)
277 {
278 int status;
279 struct nfs_fsinfo fsinfo;
280 unsigned long now;
281
282 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
283 nfs4_schedule_state_renewal(clp);
284 return 0;
285 }
286
287 now = jiffies;
288 status = nfs4_proc_get_lease_time(clp, &fsinfo);
289 if (status == 0) {
290 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
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(struct nfs4_state *state,
989 fmode_t fmode, const struct nfs_lockowner *lockowner,
990 nfs4_stateid *dst, struct rpc_cred **cred)
991 {
992 int ret;
993
994 if (cred != NULL)
995 *cred = NULL;
996 ret = nfs4_copy_lock_stateid(dst, state, lockowner);
997 if (ret == -EIO)
998 /* A lost lock - don't even consider delegations */
999 goto out;
1000 /* returns true if delegation stateid found and copied */
1001 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1002 ret = 0;
1003 goto out;
1004 }
1005 if (ret != -ENOENT)
1006 /* nfs4_copy_delegation_stateid() didn't over-write
1007 * dst, so it still has the lock stateid which we now
1008 * choose to use.
1009 */
1010 goto out;
1011 nfs4_copy_open_stateid(dst, state);
1012 ret = 0;
1013 out:
1014 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1015 dst->seqid = 0;
1016 return ret;
1017 }
1018
1019 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1020 {
1021 struct nfs_seqid *new;
1022
1023 new = kmalloc(sizeof(*new), gfp_mask);
1024 if (new == NULL)
1025 return ERR_PTR(-ENOMEM);
1026 new->sequence = counter;
1027 INIT_LIST_HEAD(&new->list);
1028 new->task = NULL;
1029 return new;
1030 }
1031
1032 void nfs_release_seqid(struct nfs_seqid *seqid)
1033 {
1034 struct nfs_seqid_counter *sequence;
1035
1036 if (seqid == NULL || list_empty(&seqid->list))
1037 return;
1038 sequence = seqid->sequence;
1039 spin_lock(&sequence->lock);
1040 list_del_init(&seqid->list);
1041 if (!list_empty(&sequence->list)) {
1042 struct nfs_seqid *next;
1043
1044 next = list_first_entry(&sequence->list,
1045 struct nfs_seqid, list);
1046 rpc_wake_up_queued_task(&sequence->wait, next->task);
1047 }
1048 spin_unlock(&sequence->lock);
1049 }
1050
1051 void nfs_free_seqid(struct nfs_seqid *seqid)
1052 {
1053 nfs_release_seqid(seqid);
1054 kfree(seqid);
1055 }
1056
1057 /*
1058 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1059 * failed with a seqid incrementing error -
1060 * see comments nfs4.h:seqid_mutating_error()
1061 */
1062 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1063 {
1064 switch (status) {
1065 case 0:
1066 break;
1067 case -NFS4ERR_BAD_SEQID:
1068 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1069 return;
1070 pr_warn_ratelimited("NFS: v4 server returned a bad"
1071 " sequence-id error on an"
1072 " unconfirmed sequence %p!\n",
1073 seqid->sequence);
1074 case -NFS4ERR_STALE_CLIENTID:
1075 case -NFS4ERR_STALE_STATEID:
1076 case -NFS4ERR_BAD_STATEID:
1077 case -NFS4ERR_BADXDR:
1078 case -NFS4ERR_RESOURCE:
1079 case -NFS4ERR_NOFILEHANDLE:
1080 /* Non-seqid mutating errors */
1081 return;
1082 };
1083 /*
1084 * Note: no locking needed as we are guaranteed to be first
1085 * on the sequence list
1086 */
1087 seqid->sequence->counter++;
1088 }
1089
1090 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1091 {
1092 struct nfs4_state_owner *sp;
1093
1094 if (seqid == NULL)
1095 return;
1096
1097 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1098 if (status == -NFS4ERR_BAD_SEQID)
1099 nfs4_drop_state_owner(sp);
1100 if (!nfs4_has_session(sp->so_server->nfs_client))
1101 nfs_increment_seqid(status, seqid);
1102 }
1103
1104 /*
1105 * Increment the seqid if the LOCK/LOCKU succeeded, or
1106 * failed with a seqid incrementing error -
1107 * see comments nfs4.h:seqid_mutating_error()
1108 */
1109 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1110 {
1111 if (seqid != NULL)
1112 nfs_increment_seqid(status, seqid);
1113 }
1114
1115 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1116 {
1117 struct nfs_seqid_counter *sequence;
1118 int status = 0;
1119
1120 if (seqid == NULL)
1121 goto out;
1122 sequence = seqid->sequence;
1123 spin_lock(&sequence->lock);
1124 seqid->task = task;
1125 if (list_empty(&seqid->list))
1126 list_add_tail(&seqid->list, &sequence->list);
1127 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1128 goto unlock;
1129 rpc_sleep_on(&sequence->wait, task, NULL);
1130 status = -EAGAIN;
1131 unlock:
1132 spin_unlock(&sequence->lock);
1133 out:
1134 return status;
1135 }
1136
1137 static int nfs4_run_state_manager(void *);
1138
1139 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1140 {
1141 smp_mb__before_atomic();
1142 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1143 smp_mb__after_atomic();
1144 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1145 rpc_wake_up(&clp->cl_rpcwaitq);
1146 }
1147
1148 /*
1149 * Schedule the nfs_client asynchronous state management routine
1150 */
1151 void nfs4_schedule_state_manager(struct nfs_client *clp)
1152 {
1153 struct task_struct *task;
1154 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1155
1156 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1157 return;
1158 __module_get(THIS_MODULE);
1159 atomic_inc(&clp->cl_count);
1160
1161 /* The rcu_read_lock() is not strictly necessary, as the state
1162 * manager is the only thread that ever changes the rpc_xprt
1163 * after it's initialized. At this point, we're single threaded. */
1164 rcu_read_lock();
1165 snprintf(buf, sizeof(buf), "%s-manager",
1166 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1167 rcu_read_unlock();
1168 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1169 if (IS_ERR(task)) {
1170 printk(KERN_ERR "%s: kthread_run: %ld\n",
1171 __func__, PTR_ERR(task));
1172 nfs4_clear_state_manager_bit(clp);
1173 nfs_put_client(clp);
1174 module_put(THIS_MODULE);
1175 }
1176 }
1177
1178 /*
1179 * Schedule a lease recovery attempt
1180 */
1181 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1182 {
1183 if (!clp)
1184 return;
1185 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1186 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1187 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1188 clp->cl_hostname);
1189 nfs4_schedule_state_manager(clp);
1190 }
1191 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1192
1193 /**
1194 * nfs4_schedule_migration_recovery - trigger migration recovery
1195 *
1196 * @server: FSID that is migrating
1197 *
1198 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1199 * value is returned.
1200 */
1201 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1202 {
1203 struct nfs_client *clp = server->nfs_client;
1204
1205 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1206 pr_err("NFS: volatile file handles not supported (server %s)\n",
1207 clp->cl_hostname);
1208 return -NFS4ERR_IO;
1209 }
1210
1211 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1212 return -NFS4ERR_IO;
1213
1214 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1215 __func__,
1216 (unsigned long long)server->fsid.major,
1217 (unsigned long long)server->fsid.minor,
1218 clp->cl_hostname);
1219
1220 set_bit(NFS_MIG_IN_TRANSITION,
1221 &((struct nfs_server *)server)->mig_status);
1222 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1223
1224 nfs4_schedule_state_manager(clp);
1225 return 0;
1226 }
1227 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1228
1229 /**
1230 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1231 *
1232 * @clp: server to check for moved leases
1233 *
1234 */
1235 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1236 {
1237 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1238 __func__, clp->cl_clientid, clp->cl_hostname);
1239
1240 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1241 nfs4_schedule_state_manager(clp);
1242 }
1243 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1244
1245 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1246 {
1247 int res;
1248
1249 might_sleep();
1250
1251 atomic_inc(&clp->cl_count);
1252 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1253 nfs_wait_bit_killable, TASK_KILLABLE);
1254 if (res)
1255 goto out;
1256 if (clp->cl_cons_state < 0)
1257 res = clp->cl_cons_state;
1258 out:
1259 nfs_put_client(clp);
1260 return res;
1261 }
1262
1263 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1264 {
1265 unsigned int loop;
1266 int ret;
1267
1268 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1269 ret = nfs4_wait_clnt_recover(clp);
1270 if (ret != 0)
1271 break;
1272 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1273 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1274 break;
1275 nfs4_schedule_state_manager(clp);
1276 ret = -EIO;
1277 }
1278 return ret;
1279 }
1280
1281 /*
1282 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1283 * @clp: client to process
1284 *
1285 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1286 * resend of the SETCLIENTID and hence re-establish the
1287 * callback channel. Then return all existing delegations.
1288 */
1289 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1290 {
1291 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1292 nfs_expire_all_delegations(clp);
1293 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1294 clp->cl_hostname);
1295 }
1296
1297 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1298 {
1299 nfs40_handle_cb_pathdown(clp);
1300 nfs4_schedule_state_manager(clp);
1301 }
1302
1303 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1304 {
1305
1306 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1307 /* Don't recover state that expired before the reboot */
1308 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1309 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1310 return 0;
1311 }
1312 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1313 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1314 return 1;
1315 }
1316
1317 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1318 {
1319 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1320 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1321 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1322 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1323 return 1;
1324 }
1325
1326 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1327 {
1328 struct nfs_client *clp = server->nfs_client;
1329
1330 if (!nfs4_valid_open_stateid(state))
1331 return -EBADF;
1332 nfs4_state_mark_reclaim_nograce(clp, state);
1333 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1334 clp->cl_hostname);
1335 nfs4_schedule_state_manager(clp);
1336 return 0;
1337 }
1338 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1339
1340 void nfs_inode_find_state_and_recover(struct inode *inode,
1341 const nfs4_stateid *stateid)
1342 {
1343 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1344 struct nfs_inode *nfsi = NFS_I(inode);
1345 struct nfs_open_context *ctx;
1346 struct nfs4_state *state;
1347 bool found = false;
1348
1349 spin_lock(&inode->i_lock);
1350 list_for_each_entry(ctx, &nfsi->open_files, list) {
1351 state = ctx->state;
1352 if (state == NULL)
1353 continue;
1354 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1355 continue;
1356 if (!nfs4_stateid_match(&state->stateid, stateid))
1357 continue;
1358 nfs4_state_mark_reclaim_nograce(clp, state);
1359 found = true;
1360 }
1361 spin_unlock(&inode->i_lock);
1362 if (found)
1363 nfs4_schedule_state_manager(clp);
1364 }
1365
1366 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1367 {
1368 struct inode *inode = state->inode;
1369 struct nfs_inode *nfsi = NFS_I(inode);
1370 struct nfs_open_context *ctx;
1371
1372 spin_lock(&inode->i_lock);
1373 list_for_each_entry(ctx, &nfsi->open_files, list) {
1374 if (ctx->state != state)
1375 continue;
1376 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1377 }
1378 spin_unlock(&inode->i_lock);
1379 }
1380
1381 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1382 {
1383 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1384 nfs4_state_mark_open_context_bad(state);
1385 }
1386
1387
1388 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1389 {
1390 struct inode *inode = state->inode;
1391 struct nfs_inode *nfsi = NFS_I(inode);
1392 struct file_lock *fl;
1393 int status = 0;
1394 struct file_lock_context *flctx = inode->i_flctx;
1395 struct list_head *list;
1396
1397 if (flctx == NULL)
1398 return 0;
1399
1400 list = &flctx->flc_posix;
1401
1402 /* Guard against delegation returns and new lock/unlock calls */
1403 down_write(&nfsi->rwsem);
1404 spin_lock(&flctx->flc_lock);
1405 restart:
1406 list_for_each_entry(fl, list, fl_list) {
1407 if (nfs_file_open_context(fl->fl_file)->state != state)
1408 continue;
1409 spin_unlock(&flctx->flc_lock);
1410 status = ops->recover_lock(state, fl);
1411 switch (status) {
1412 case 0:
1413 break;
1414 case -ESTALE:
1415 case -NFS4ERR_ADMIN_REVOKED:
1416 case -NFS4ERR_STALE_STATEID:
1417 case -NFS4ERR_BAD_STATEID:
1418 case -NFS4ERR_EXPIRED:
1419 case -NFS4ERR_NO_GRACE:
1420 case -NFS4ERR_STALE_CLIENTID:
1421 case -NFS4ERR_BADSESSION:
1422 case -NFS4ERR_BADSLOT:
1423 case -NFS4ERR_BAD_HIGH_SLOT:
1424 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1425 goto out;
1426 default:
1427 pr_err("NFS: %s: unhandled error %d\n",
1428 __func__, status);
1429 case -ENOMEM:
1430 case -NFS4ERR_DENIED:
1431 case -NFS4ERR_RECLAIM_BAD:
1432 case -NFS4ERR_RECLAIM_CONFLICT:
1433 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1434 status = 0;
1435 }
1436 spin_lock(&flctx->flc_lock);
1437 }
1438 if (list == &flctx->flc_posix) {
1439 list = &flctx->flc_flock;
1440 goto restart;
1441 }
1442 spin_unlock(&flctx->flc_lock);
1443 out:
1444 up_write(&nfsi->rwsem);
1445 return status;
1446 }
1447
1448 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1449 {
1450 struct nfs4_state *state;
1451 struct nfs4_lock_state *lock;
1452 int status = 0;
1453
1454 /* Note: we rely on the sp->so_states list being ordered
1455 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1456 * states first.
1457 * This is needed to ensure that the server won't give us any
1458 * read delegations that we have to return if, say, we are
1459 * recovering after a network partition or a reboot from a
1460 * server that doesn't support a grace period.
1461 */
1462 spin_lock(&sp->so_lock);
1463 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1464 restart:
1465 list_for_each_entry(state, &sp->so_states, open_states) {
1466 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1467 continue;
1468 if (!nfs4_valid_open_stateid(state))
1469 continue;
1470 if (state->state == 0)
1471 continue;
1472 atomic_inc(&state->count);
1473 spin_unlock(&sp->so_lock);
1474 status = ops->recover_open(sp, state);
1475 if (status >= 0) {
1476 status = nfs4_reclaim_locks(state, ops);
1477 if (status >= 0) {
1478 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1479 spin_lock(&state->state_lock);
1480 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1481 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1482 pr_warn_ratelimited("NFS: "
1483 "%s: Lock reclaim "
1484 "failed!\n", __func__);
1485 }
1486 spin_unlock(&state->state_lock);
1487 }
1488 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1489 &state->flags);
1490 nfs4_put_open_state(state);
1491 spin_lock(&sp->so_lock);
1492 goto restart;
1493 }
1494 }
1495 switch (status) {
1496 default:
1497 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1498 __func__, status);
1499 case -ENOENT:
1500 case -ENOMEM:
1501 case -ESTALE:
1502 /* Open state on this file cannot be recovered */
1503 nfs4_state_mark_recovery_failed(state, status);
1504 break;
1505 case -EAGAIN:
1506 ssleep(1);
1507 case -NFS4ERR_ADMIN_REVOKED:
1508 case -NFS4ERR_STALE_STATEID:
1509 case -NFS4ERR_BAD_STATEID:
1510 case -NFS4ERR_RECLAIM_BAD:
1511 case -NFS4ERR_RECLAIM_CONFLICT:
1512 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1513 break;
1514 case -NFS4ERR_EXPIRED:
1515 case -NFS4ERR_NO_GRACE:
1516 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1517 case -NFS4ERR_STALE_CLIENTID:
1518 case -NFS4ERR_BADSESSION:
1519 case -NFS4ERR_BADSLOT:
1520 case -NFS4ERR_BAD_HIGH_SLOT:
1521 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1522 goto out_err;
1523 }
1524 nfs4_put_open_state(state);
1525 spin_lock(&sp->so_lock);
1526 goto restart;
1527 }
1528 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1529 spin_unlock(&sp->so_lock);
1530 return 0;
1531 out_err:
1532 nfs4_put_open_state(state);
1533 spin_lock(&sp->so_lock);
1534 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1535 spin_unlock(&sp->so_lock);
1536 return status;
1537 }
1538
1539 static void nfs4_clear_open_state(struct nfs4_state *state)
1540 {
1541 struct nfs4_lock_state *lock;
1542
1543 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1544 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1545 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1546 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1547 spin_lock(&state->state_lock);
1548 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1549 lock->ls_seqid.flags = 0;
1550 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1551 }
1552 spin_unlock(&state->state_lock);
1553 }
1554
1555 static void nfs4_reset_seqids(struct nfs_server *server,
1556 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1557 {
1558 struct nfs_client *clp = server->nfs_client;
1559 struct nfs4_state_owner *sp;
1560 struct rb_node *pos;
1561 struct nfs4_state *state;
1562
1563 spin_lock(&clp->cl_lock);
1564 for (pos = rb_first(&server->state_owners);
1565 pos != NULL;
1566 pos = rb_next(pos)) {
1567 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1568 sp->so_seqid.flags = 0;
1569 spin_lock(&sp->so_lock);
1570 list_for_each_entry(state, &sp->so_states, open_states) {
1571 if (mark_reclaim(clp, state))
1572 nfs4_clear_open_state(state);
1573 }
1574 spin_unlock(&sp->so_lock);
1575 }
1576 spin_unlock(&clp->cl_lock);
1577 }
1578
1579 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1580 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1581 {
1582 struct nfs_server *server;
1583
1584 rcu_read_lock();
1585 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1586 nfs4_reset_seqids(server, mark_reclaim);
1587 rcu_read_unlock();
1588 }
1589
1590 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1591 {
1592 /* Mark all delegations for reclaim */
1593 nfs_delegation_mark_reclaim(clp);
1594 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1595 }
1596
1597 static void nfs4_reclaim_complete(struct nfs_client *clp,
1598 const struct nfs4_state_recovery_ops *ops,
1599 struct rpc_cred *cred)
1600 {
1601 /* Notify the server we're done reclaiming our state */
1602 if (ops->reclaim_complete)
1603 (void)ops->reclaim_complete(clp, cred);
1604 }
1605
1606 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1607 {
1608 struct nfs_client *clp = server->nfs_client;
1609 struct nfs4_state_owner *sp;
1610 struct rb_node *pos;
1611 struct nfs4_state *state;
1612
1613 spin_lock(&clp->cl_lock);
1614 for (pos = rb_first(&server->state_owners);
1615 pos != NULL;
1616 pos = rb_next(pos)) {
1617 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1618 spin_lock(&sp->so_lock);
1619 list_for_each_entry(state, &sp->so_states, open_states) {
1620 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1621 &state->flags))
1622 continue;
1623 nfs4_state_mark_reclaim_nograce(clp, state);
1624 }
1625 spin_unlock(&sp->so_lock);
1626 }
1627 spin_unlock(&clp->cl_lock);
1628 }
1629
1630 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1631 {
1632 struct nfs_server *server;
1633
1634 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1635 return 0;
1636
1637 rcu_read_lock();
1638 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1639 nfs4_clear_reclaim_server(server);
1640 rcu_read_unlock();
1641
1642 nfs_delegation_reap_unclaimed(clp);
1643 return 1;
1644 }
1645
1646 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1647 {
1648 const struct nfs4_state_recovery_ops *ops;
1649 struct rpc_cred *cred;
1650
1651 if (!nfs4_state_clear_reclaim_reboot(clp))
1652 return;
1653 ops = clp->cl_mvops->reboot_recovery_ops;
1654 cred = nfs4_get_clid_cred(clp);
1655 nfs4_reclaim_complete(clp, ops, cred);
1656 put_rpccred(cred);
1657 }
1658
1659 static void nfs_delegation_clear_all(struct nfs_client *clp)
1660 {
1661 nfs_delegation_mark_reclaim(clp);
1662 nfs_delegation_reap_unclaimed(clp);
1663 }
1664
1665 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1666 {
1667 nfs_delegation_clear_all(clp);
1668 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1669 }
1670
1671 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1672 {
1673 switch (error) {
1674 case 0:
1675 break;
1676 case -NFS4ERR_CB_PATH_DOWN:
1677 nfs40_handle_cb_pathdown(clp);
1678 break;
1679 case -NFS4ERR_NO_GRACE:
1680 nfs4_state_end_reclaim_reboot(clp);
1681 break;
1682 case -NFS4ERR_STALE_CLIENTID:
1683 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1684 nfs4_state_clear_reclaim_reboot(clp);
1685 nfs4_state_start_reclaim_reboot(clp);
1686 break;
1687 case -NFS4ERR_EXPIRED:
1688 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1689 nfs4_state_start_reclaim_nograce(clp);
1690 break;
1691 case -NFS4ERR_BADSESSION:
1692 case -NFS4ERR_BADSLOT:
1693 case -NFS4ERR_BAD_HIGH_SLOT:
1694 case -NFS4ERR_DEADSESSION:
1695 case -NFS4ERR_SEQ_FALSE_RETRY:
1696 case -NFS4ERR_SEQ_MISORDERED:
1697 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1698 /* Zero session reset errors */
1699 break;
1700 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1701 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1702 break;
1703 default:
1704 dprintk("%s: failed to handle error %d for server %s\n",
1705 __func__, error, clp->cl_hostname);
1706 return error;
1707 }
1708 dprintk("%s: handled error %d for server %s\n", __func__, error,
1709 clp->cl_hostname);
1710 return 0;
1711 }
1712
1713 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1714 {
1715 struct nfs4_state_owner *sp;
1716 struct nfs_server *server;
1717 struct rb_node *pos;
1718 int status = 0;
1719
1720 restart:
1721 rcu_read_lock();
1722 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1723 nfs4_purge_state_owners(server);
1724 spin_lock(&clp->cl_lock);
1725 for (pos = rb_first(&server->state_owners);
1726 pos != NULL;
1727 pos = rb_next(pos)) {
1728 sp = rb_entry(pos,
1729 struct nfs4_state_owner, so_server_node);
1730 if (!test_and_clear_bit(ops->owner_flag_bit,
1731 &sp->so_flags))
1732 continue;
1733 if (!atomic_inc_not_zero(&sp->so_count))
1734 continue;
1735 spin_unlock(&clp->cl_lock);
1736 rcu_read_unlock();
1737
1738 status = nfs4_reclaim_open_state(sp, ops);
1739 if (status < 0) {
1740 set_bit(ops->owner_flag_bit, &sp->so_flags);
1741 nfs4_put_state_owner(sp);
1742 status = nfs4_recovery_handle_error(clp, status);
1743 return (status != 0) ? status : -EAGAIN;
1744 }
1745
1746 nfs4_put_state_owner(sp);
1747 goto restart;
1748 }
1749 spin_unlock(&clp->cl_lock);
1750 }
1751 rcu_read_unlock();
1752 return 0;
1753 }
1754
1755 static int nfs4_check_lease(struct nfs_client *clp)
1756 {
1757 struct rpc_cred *cred;
1758 const struct nfs4_state_maintenance_ops *ops =
1759 clp->cl_mvops->state_renewal_ops;
1760 int status;
1761
1762 /* Is the client already known to have an expired lease? */
1763 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1764 return 0;
1765 spin_lock(&clp->cl_lock);
1766 cred = ops->get_state_renewal_cred_locked(clp);
1767 spin_unlock(&clp->cl_lock);
1768 if (cred == NULL) {
1769 cred = nfs4_get_clid_cred(clp);
1770 status = -ENOKEY;
1771 if (cred == NULL)
1772 goto out;
1773 }
1774 status = ops->renew_lease(clp, cred);
1775 put_rpccred(cred);
1776 if (status == -ETIMEDOUT) {
1777 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1778 return 0;
1779 }
1780 out:
1781 return nfs4_recovery_handle_error(clp, status);
1782 }
1783
1784 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1785 * and for recoverable errors on EXCHANGE_ID for v4.1
1786 */
1787 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1788 {
1789 switch (status) {
1790 case -NFS4ERR_SEQ_MISORDERED:
1791 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1792 return -ESERVERFAULT;
1793 /* Lease confirmation error: retry after purging the lease */
1794 ssleep(1);
1795 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1796 break;
1797 case -NFS4ERR_STALE_CLIENTID:
1798 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1799 nfs4_state_start_reclaim_reboot(clp);
1800 break;
1801 case -NFS4ERR_CLID_INUSE:
1802 pr_err("NFS: Server %s reports our clientid is in use\n",
1803 clp->cl_hostname);
1804 nfs_mark_client_ready(clp, -EPERM);
1805 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1806 return -EPERM;
1807 case -EACCES:
1808 case -NFS4ERR_DELAY:
1809 case -ETIMEDOUT:
1810 case -EAGAIN:
1811 ssleep(1);
1812 break;
1813
1814 case -NFS4ERR_MINOR_VERS_MISMATCH:
1815 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1816 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1817 dprintk("%s: exit with error %d for server %s\n",
1818 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1819 return -EPROTONOSUPPORT;
1820 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1821 * in nfs4_exchange_id */
1822 default:
1823 dprintk("%s: exit with error %d for server %s\n", __func__,
1824 status, clp->cl_hostname);
1825 return status;
1826 }
1827 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1828 dprintk("%s: handled error %d for server %s\n", __func__, status,
1829 clp->cl_hostname);
1830 return 0;
1831 }
1832
1833 static int nfs4_establish_lease(struct nfs_client *clp)
1834 {
1835 struct rpc_cred *cred;
1836 const struct nfs4_state_recovery_ops *ops =
1837 clp->cl_mvops->reboot_recovery_ops;
1838 int status;
1839
1840 nfs4_begin_drain_session(clp);
1841 cred = nfs4_get_clid_cred(clp);
1842 if (cred == NULL)
1843 return -ENOENT;
1844 status = ops->establish_clid(clp, cred);
1845 put_rpccred(cred);
1846 if (status != 0)
1847 return status;
1848 pnfs_destroy_all_layouts(clp);
1849 return 0;
1850 }
1851
1852 /*
1853 * Returns zero or a negative errno. NFS4ERR values are converted
1854 * to local errno values.
1855 */
1856 static int nfs4_reclaim_lease(struct nfs_client *clp)
1857 {
1858 int status;
1859
1860 status = nfs4_establish_lease(clp);
1861 if (status < 0)
1862 return nfs4_handle_reclaim_lease_error(clp, status);
1863 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1864 nfs4_state_start_reclaim_nograce(clp);
1865 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1866 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1867 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1868 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1869 return 0;
1870 }
1871
1872 static int nfs4_purge_lease(struct nfs_client *clp)
1873 {
1874 int status;
1875
1876 status = nfs4_establish_lease(clp);
1877 if (status < 0)
1878 return nfs4_handle_reclaim_lease_error(clp, status);
1879 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1880 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1881 nfs4_state_start_reclaim_nograce(clp);
1882 return 0;
1883 }
1884
1885 /*
1886 * Try remote migration of one FSID from a source server to a
1887 * destination server. The source server provides a list of
1888 * potential destinations.
1889 *
1890 * Returns zero or a negative NFS4ERR status code.
1891 */
1892 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1893 {
1894 struct nfs_client *clp = server->nfs_client;
1895 struct nfs4_fs_locations *locations = NULL;
1896 struct inode *inode;
1897 struct page *page;
1898 int status, result;
1899
1900 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1901 (unsigned long long)server->fsid.major,
1902 (unsigned long long)server->fsid.minor,
1903 clp->cl_hostname);
1904
1905 result = 0;
1906 page = alloc_page(GFP_KERNEL);
1907 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1908 if (page == NULL || locations == NULL) {
1909 dprintk("<-- %s: no memory\n", __func__);
1910 goto out;
1911 }
1912
1913 inode = d_inode(server->super->s_root);
1914 result = nfs4_proc_get_locations(inode, locations, page, cred);
1915 if (result) {
1916 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1917 __func__, result);
1918 goto out;
1919 }
1920
1921 result = -NFS4ERR_NXIO;
1922 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1923 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1924 __func__);
1925 goto out;
1926 }
1927
1928 nfs4_begin_drain_session(clp);
1929
1930 status = nfs4_replace_transport(server, locations);
1931 if (status != 0) {
1932 dprintk("<-- %s: failed to replace transport: %d\n",
1933 __func__, status);
1934 goto out;
1935 }
1936
1937 result = 0;
1938 dprintk("<-- %s: migration succeeded\n", __func__);
1939
1940 out:
1941 if (page != NULL)
1942 __free_page(page);
1943 kfree(locations);
1944 if (result) {
1945 pr_err("NFS: migration recovery failed (server %s)\n",
1946 clp->cl_hostname);
1947 set_bit(NFS_MIG_FAILED, &server->mig_status);
1948 }
1949 return result;
1950 }
1951
1952 /*
1953 * Returns zero or a negative NFS4ERR status code.
1954 */
1955 static int nfs4_handle_migration(struct nfs_client *clp)
1956 {
1957 const struct nfs4_state_maintenance_ops *ops =
1958 clp->cl_mvops->state_renewal_ops;
1959 struct nfs_server *server;
1960 struct rpc_cred *cred;
1961
1962 dprintk("%s: migration reported on \"%s\"\n", __func__,
1963 clp->cl_hostname);
1964
1965 spin_lock(&clp->cl_lock);
1966 cred = ops->get_state_renewal_cred_locked(clp);
1967 spin_unlock(&clp->cl_lock);
1968 if (cred == NULL)
1969 return -NFS4ERR_NOENT;
1970
1971 clp->cl_mig_gen++;
1972 restart:
1973 rcu_read_lock();
1974 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1975 int status;
1976
1977 if (server->mig_gen == clp->cl_mig_gen)
1978 continue;
1979 server->mig_gen = clp->cl_mig_gen;
1980
1981 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
1982 &server->mig_status))
1983 continue;
1984
1985 rcu_read_unlock();
1986 status = nfs4_try_migration(server, cred);
1987 if (status < 0) {
1988 put_rpccred(cred);
1989 return status;
1990 }
1991 goto restart;
1992 }
1993 rcu_read_unlock();
1994 put_rpccred(cred);
1995 return 0;
1996 }
1997
1998 /*
1999 * Test each nfs_server on the clp's cl_superblocks list to see
2000 * if it's moved to another server. Stop when the server no longer
2001 * returns NFS4ERR_LEASE_MOVED.
2002 */
2003 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2004 {
2005 const struct nfs4_state_maintenance_ops *ops =
2006 clp->cl_mvops->state_renewal_ops;
2007 struct nfs_server *server;
2008 struct rpc_cred *cred;
2009
2010 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2011 clp->cl_hostname);
2012
2013 spin_lock(&clp->cl_lock);
2014 cred = ops->get_state_renewal_cred_locked(clp);
2015 spin_unlock(&clp->cl_lock);
2016 if (cred == NULL)
2017 return -NFS4ERR_NOENT;
2018
2019 clp->cl_mig_gen++;
2020 restart:
2021 rcu_read_lock();
2022 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2023 struct inode *inode;
2024 int status;
2025
2026 if (server->mig_gen == clp->cl_mig_gen)
2027 continue;
2028 server->mig_gen = clp->cl_mig_gen;
2029
2030 rcu_read_unlock();
2031
2032 inode = d_inode(server->super->s_root);
2033 status = nfs4_proc_fsid_present(inode, cred);
2034 if (status != -NFS4ERR_MOVED)
2035 goto restart; /* wasn't this one */
2036 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2037 goto restart; /* there are more */
2038 goto out;
2039 }
2040 rcu_read_unlock();
2041
2042 out:
2043 put_rpccred(cred);
2044 return 0;
2045 }
2046
2047 /**
2048 * nfs4_discover_server_trunking - Detect server IP address trunking
2049 *
2050 * @clp: nfs_client under test
2051 * @result: OUT: found nfs_client, or clp
2052 *
2053 * Returns zero or a negative errno. If zero is returned,
2054 * an nfs_client pointer is planted in "result".
2055 *
2056 * Note: since we are invoked in process context, and
2057 * not from inside the state manager, we cannot use
2058 * nfs4_handle_reclaim_lease_error().
2059 */
2060 int nfs4_discover_server_trunking(struct nfs_client *clp,
2061 struct nfs_client **result)
2062 {
2063 const struct nfs4_state_recovery_ops *ops =
2064 clp->cl_mvops->reboot_recovery_ops;
2065 struct rpc_clnt *clnt;
2066 struct rpc_cred *cred;
2067 int i, status;
2068
2069 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2070
2071 clnt = clp->cl_rpcclient;
2072 i = 0;
2073
2074 mutex_lock(&nfs_clid_init_mutex);
2075 again:
2076 status = -ENOENT;
2077 cred = nfs4_get_clid_cred(clp);
2078 if (cred == NULL)
2079 goto out_unlock;
2080
2081 status = ops->detect_trunking(clp, result, cred);
2082 put_rpccred(cred);
2083 switch (status) {
2084 case 0:
2085 break;
2086 case -ETIMEDOUT:
2087 if (clnt->cl_softrtry)
2088 break;
2089 case -NFS4ERR_DELAY:
2090 case -EAGAIN:
2091 ssleep(1);
2092 case -NFS4ERR_STALE_CLIENTID:
2093 dprintk("NFS: %s after status %d, retrying\n",
2094 __func__, status);
2095 goto again;
2096 case -EACCES:
2097 if (i++ == 0) {
2098 nfs4_root_machine_cred(clp);
2099 goto again;
2100 }
2101 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2102 break;
2103 case -NFS4ERR_CLID_INUSE:
2104 case -NFS4ERR_WRONGSEC:
2105 /* No point in retrying if we already used RPC_AUTH_UNIX */
2106 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2107 status = -EPERM;
2108 break;
2109 }
2110 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2111 if (IS_ERR(clnt)) {
2112 status = PTR_ERR(clnt);
2113 break;
2114 }
2115 /* Note: this is safe because we haven't yet marked the
2116 * client as ready, so we are the only user of
2117 * clp->cl_rpcclient
2118 */
2119 clnt = xchg(&clp->cl_rpcclient, clnt);
2120 rpc_shutdown_client(clnt);
2121 clnt = clp->cl_rpcclient;
2122 goto again;
2123
2124 case -NFS4ERR_MINOR_VERS_MISMATCH:
2125 status = -EPROTONOSUPPORT;
2126 break;
2127
2128 case -EKEYEXPIRED:
2129 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2130 * in nfs4_exchange_id */
2131 status = -EKEYEXPIRED;
2132 break;
2133 default:
2134 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2135 __func__, status);
2136 status = -EIO;
2137 }
2138
2139 out_unlock:
2140 mutex_unlock(&nfs_clid_init_mutex);
2141 dprintk("NFS: %s: status = %d\n", __func__, status);
2142 return status;
2143 }
2144
2145 #ifdef CONFIG_NFS_V4_1
2146 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2147 {
2148 struct nfs_client *clp = session->clp;
2149
2150 switch (err) {
2151 default:
2152 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2153 break;
2154 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2155 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2156 }
2157 nfs4_schedule_lease_recovery(clp);
2158 }
2159 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2160
2161 void nfs41_notify_server(struct nfs_client *clp)
2162 {
2163 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2164 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2165 nfs4_schedule_state_manager(clp);
2166 }
2167
2168 static void nfs4_reset_all_state(struct nfs_client *clp)
2169 {
2170 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2171 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2172 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2173 nfs4_state_start_reclaim_nograce(clp);
2174 dprintk("%s: scheduling reset of all state for server %s!\n",
2175 __func__, clp->cl_hostname);
2176 nfs4_schedule_state_manager(clp);
2177 }
2178 }
2179
2180 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2181 {
2182 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2183 nfs4_state_start_reclaim_reboot(clp);
2184 dprintk("%s: server %s rebooted!\n", __func__,
2185 clp->cl_hostname);
2186 nfs4_schedule_state_manager(clp);
2187 }
2188 }
2189
2190 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2191 {
2192 nfs4_reset_all_state(clp);
2193 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2194 }
2195
2196 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2197 {
2198 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
2199 nfs4_schedule_state_manager(clp);
2200
2201 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2202 }
2203
2204 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2205 {
2206 /* FIXME: For now, we destroy all layouts. */
2207 pnfs_destroy_all_layouts(clp);
2208 /* FIXME: For now, we test all delegations+open state+locks. */
2209 nfs41_handle_some_state_revoked(clp);
2210 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2211 clp->cl_hostname);
2212 }
2213
2214 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2215 {
2216 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2217 nfs4_schedule_state_manager(clp);
2218
2219 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2220 clp->cl_hostname);
2221 }
2222
2223 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2224 {
2225 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2226 &clp->cl_state) == 0)
2227 nfs4_schedule_state_manager(clp);
2228 }
2229
2230 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2231 {
2232 if (!flags)
2233 return;
2234
2235 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2236 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2237
2238 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2239 nfs41_handle_server_reboot(clp);
2240 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2241 nfs41_handle_all_state_revoked(clp);
2242 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2243 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2244 nfs41_handle_some_state_revoked(clp);
2245 if (flags & SEQ4_STATUS_LEASE_MOVED)
2246 nfs4_schedule_lease_moved_recovery(clp);
2247 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2248 nfs41_handle_recallable_state_revoked(clp);
2249 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2250 nfs41_handle_backchannel_fault(clp);
2251 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2252 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2253 nfs41_handle_cb_path_down(clp);
2254 }
2255
2256 static int nfs4_reset_session(struct nfs_client *clp)
2257 {
2258 struct rpc_cred *cred;
2259 int status;
2260
2261 if (!nfs4_has_session(clp))
2262 return 0;
2263 nfs4_begin_drain_session(clp);
2264 cred = nfs4_get_clid_cred(clp);
2265 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2266 switch (status) {
2267 case 0:
2268 case -NFS4ERR_BADSESSION:
2269 case -NFS4ERR_DEADSESSION:
2270 break;
2271 case -NFS4ERR_BACK_CHAN_BUSY:
2272 case -NFS4ERR_DELAY:
2273 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2274 status = 0;
2275 ssleep(1);
2276 goto out;
2277 default:
2278 status = nfs4_recovery_handle_error(clp, status);
2279 goto out;
2280 }
2281
2282 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2283 status = nfs4_proc_create_session(clp, cred);
2284 if (status) {
2285 dprintk("%s: session reset failed with status %d for server %s!\n",
2286 __func__, status, clp->cl_hostname);
2287 status = nfs4_handle_reclaim_lease_error(clp, status);
2288 goto out;
2289 }
2290 nfs41_finish_session_reset(clp);
2291 dprintk("%s: session reset was successful for server %s!\n",
2292 __func__, clp->cl_hostname);
2293 out:
2294 if (cred)
2295 put_rpccred(cred);
2296 return status;
2297 }
2298
2299 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2300 {
2301 struct rpc_cred *cred;
2302 int ret;
2303
2304 if (!nfs4_has_session(clp))
2305 return 0;
2306 nfs4_begin_drain_session(clp);
2307 cred = nfs4_get_clid_cred(clp);
2308 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2309 if (cred)
2310 put_rpccred(cred);
2311 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2312 switch (ret) {
2313 case 0:
2314 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2315 __func__, clp->cl_hostname);
2316 break;
2317 case -NFS4ERR_DELAY:
2318 ssleep(1);
2319 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2320 break;
2321 default:
2322 return nfs4_recovery_handle_error(clp, ret);
2323 }
2324 return 0;
2325 }
2326 #else /* CONFIG_NFS_V4_1 */
2327 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2328
2329 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2330 {
2331 return 0;
2332 }
2333 #endif /* CONFIG_NFS_V4_1 */
2334
2335 static void nfs4_state_manager(struct nfs_client *clp)
2336 {
2337 int status = 0;
2338 const char *section = "", *section_sep = "";
2339
2340 /* Ensure exclusive access to NFSv4 state */
2341 do {
2342 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2343 section = "purge state";
2344 status = nfs4_purge_lease(clp);
2345 if (status < 0)
2346 goto out_error;
2347 continue;
2348 }
2349
2350 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2351 section = "lease expired";
2352 /* We're going to have to re-establish a clientid */
2353 status = nfs4_reclaim_lease(clp);
2354 if (status < 0)
2355 goto out_error;
2356 continue;
2357 }
2358
2359 /* Initialize or reset the session */
2360 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2361 section = "reset session";
2362 status = nfs4_reset_session(clp);
2363 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2364 continue;
2365 if (status < 0)
2366 goto out_error;
2367 }
2368
2369 /* Send BIND_CONN_TO_SESSION */
2370 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2371 &clp->cl_state)) {
2372 section = "bind conn to session";
2373 status = nfs4_bind_conn_to_session(clp);
2374 if (status < 0)
2375 goto out_error;
2376 continue;
2377 }
2378
2379 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2380 section = "check lease";
2381 status = nfs4_check_lease(clp);
2382 if (status < 0)
2383 goto out_error;
2384 continue;
2385 }
2386
2387 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2388 section = "migration";
2389 status = nfs4_handle_migration(clp);
2390 if (status < 0)
2391 goto out_error;
2392 }
2393
2394 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2395 section = "lease moved";
2396 status = nfs4_handle_lease_moved(clp);
2397 if (status < 0)
2398 goto out_error;
2399 }
2400
2401 /* First recover reboot state... */
2402 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2403 section = "reclaim reboot";
2404 status = nfs4_do_reclaim(clp,
2405 clp->cl_mvops->reboot_recovery_ops);
2406 if (status == -EAGAIN)
2407 continue;
2408 if (status < 0)
2409 goto out_error;
2410 nfs4_state_end_reclaim_reboot(clp);
2411 }
2412
2413 /* Now recover expired state... */
2414 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2415 section = "reclaim nograce";
2416 status = nfs4_do_reclaim(clp,
2417 clp->cl_mvops->nograce_recovery_ops);
2418 if (status == -EAGAIN)
2419 continue;
2420 if (status < 0)
2421 goto out_error;
2422 }
2423
2424 nfs4_end_drain_session(clp);
2425 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2426 nfs_client_return_marked_delegations(clp);
2427 continue;
2428 }
2429
2430 nfs4_clear_state_manager_bit(clp);
2431 /* Did we race with an attempt to give us more work? */
2432 if (clp->cl_state == 0)
2433 break;
2434 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2435 break;
2436 } while (atomic_read(&clp->cl_count) > 1);
2437 return;
2438 out_error:
2439 if (strlen(section))
2440 section_sep = ": ";
2441 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2442 " with error %d\n", section_sep, section,
2443 clp->cl_hostname, -status);
2444 ssleep(1);
2445 nfs4_end_drain_session(clp);
2446 nfs4_clear_state_manager_bit(clp);
2447 }
2448
2449 static int nfs4_run_state_manager(void *ptr)
2450 {
2451 struct nfs_client *clp = ptr;
2452
2453 allow_signal(SIGKILL);
2454 nfs4_state_manager(clp);
2455 nfs_put_client(clp);
2456 module_put_and_exit(0);
2457 return 0;
2458 }
2459
2460 /*
2461 * Local variables:
2462 * c-basic-offset: 8
2463 * End:
2464 */
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