Loading...
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#include "nfs4trace.h"
64
65#define NFSDBG_FACILITY NFSDBG_STATE
66
67#define OPENOWNER_POOL_SIZE 8
68
69const nfs4_stateid zero_stateid = {
70 { .data = { 0 } },
71 .type = NFS4_SPECIAL_STATEID_TYPE,
72};
73const nfs4_stateid invalid_stateid = {
74 {
75 /* Funky initialiser keeps older gcc versions happy */
76 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
77 },
78 .type = NFS4_INVALID_STATEID_TYPE,
79};
80
81const nfs4_stateid current_stateid = {
82 {
83 /* Funky initialiser keeps older gcc versions happy */
84 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
85 },
86 .type = NFS4_SPECIAL_STATEID_TYPE,
87};
88
89static DEFINE_MUTEX(nfs_clid_init_mutex);
90
91static int nfs4_setup_state_renewal(struct nfs_client *clp)
92{
93 int status;
94 struct nfs_fsinfo fsinfo;
95
96 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
97 nfs4_schedule_state_renewal(clp);
98 return 0;
99 }
100
101 status = nfs4_proc_get_lease_time(clp, &fsinfo);
102 if (status == 0) {
103 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
104 nfs4_schedule_state_renewal(clp);
105 }
106
107 return status;
108}
109
110int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
111{
112 struct nfs4_setclientid_res clid = {
113 .clientid = clp->cl_clientid,
114 .confirm = clp->cl_confirm,
115 };
116 unsigned short port;
117 int status;
118 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
119
120 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
121 goto do_confirm;
122 port = nn->nfs_callback_tcpport;
123 if (clp->cl_addr.ss_family == AF_INET6)
124 port = nn->nfs_callback_tcpport6;
125
126 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
127 if (status != 0)
128 goto out;
129 clp->cl_clientid = clid.clientid;
130 clp->cl_confirm = clid.confirm;
131 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
132do_confirm:
133 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
134 if (status != 0)
135 goto out;
136 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
137 nfs4_setup_state_renewal(clp);
138out:
139 return status;
140}
141
142/**
143 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
144 *
145 * @clp: nfs_client under test
146 * @result: OUT: found nfs_client, or clp
147 * @cred: credential to use for trunking test
148 *
149 * Returns zero, a negative errno, or a negative NFS4ERR status.
150 * If zero is returned, an nfs_client pointer is planted in
151 * "result".
152 *
153 * Note: The returned client may not yet be marked ready.
154 */
155int nfs40_discover_server_trunking(struct nfs_client *clp,
156 struct nfs_client **result,
157 const struct cred *cred)
158{
159 struct nfs4_setclientid_res clid = {
160 .clientid = clp->cl_clientid,
161 .confirm = clp->cl_confirm,
162 };
163 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
164 unsigned short port;
165 int status;
166
167 port = nn->nfs_callback_tcpport;
168 if (clp->cl_addr.ss_family == AF_INET6)
169 port = nn->nfs_callback_tcpport6;
170
171 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
172 if (status != 0)
173 goto out;
174 clp->cl_clientid = clid.clientid;
175 clp->cl_confirm = clid.confirm;
176
177 status = nfs40_walk_client_list(clp, result, cred);
178 if (status == 0) {
179 /* Sustain the lease, even if it's empty. If the clientid4
180 * goes stale it's of no use for trunking discovery. */
181 nfs4_schedule_state_renewal(*result);
182
183 /* If the client state need to recover, do it. */
184 if (clp->cl_state)
185 nfs4_schedule_state_manager(clp);
186 }
187out:
188 return status;
189}
190
191const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
192{
193 return get_cred(rpc_machine_cred());
194}
195
196static void nfs4_root_machine_cred(struct nfs_client *clp)
197{
198
199 /* Force root creds instead of machine */
200 clp->cl_principal = NULL;
201 clp->cl_rpcclient->cl_principal = NULL;
202}
203
204static const struct cred *
205nfs4_get_renew_cred_server_locked(struct nfs_server *server)
206{
207 const struct cred *cred = NULL;
208 struct nfs4_state_owner *sp;
209 struct rb_node *pos;
210
211 for (pos = rb_first(&server->state_owners);
212 pos != NULL;
213 pos = rb_next(pos)) {
214 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
215 if (list_empty(&sp->so_states))
216 continue;
217 cred = get_cred(sp->so_cred);
218 break;
219 }
220 return cred;
221}
222
223/**
224 * nfs4_get_renew_cred - Acquire credential for a renew operation
225 * @clp: client state handle
226 *
227 * Returns an rpc_cred with reference count bumped, or NULL.
228 * Caller must hold clp->cl_lock.
229 */
230const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
231{
232 const struct cred *cred = NULL;
233 struct nfs_server *server;
234
235 /* Use machine credentials if available */
236 cred = nfs4_get_machine_cred(clp);
237 if (cred != NULL)
238 goto out;
239
240 spin_lock(&clp->cl_lock);
241 rcu_read_lock();
242 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
243 cred = nfs4_get_renew_cred_server_locked(server);
244 if (cred != NULL)
245 break;
246 }
247 rcu_read_unlock();
248 spin_unlock(&clp->cl_lock);
249
250out:
251 return cred;
252}
253
254static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
255{
256 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
257 spin_lock(&tbl->slot_tbl_lock);
258 nfs41_wake_slot_table(tbl);
259 spin_unlock(&tbl->slot_tbl_lock);
260 }
261}
262
263static void nfs4_end_drain_session(struct nfs_client *clp)
264{
265 struct nfs4_session *ses = clp->cl_session;
266
267 if (clp->cl_slot_tbl) {
268 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
269 return;
270 }
271
272 if (ses != NULL) {
273 nfs4_end_drain_slot_table(&ses->bc_slot_table);
274 nfs4_end_drain_slot_table(&ses->fc_slot_table);
275 }
276}
277
278static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
279{
280 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
281 spin_lock(&tbl->slot_tbl_lock);
282 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
283 reinit_completion(&tbl->complete);
284 spin_unlock(&tbl->slot_tbl_lock);
285 return wait_for_completion_interruptible(&tbl->complete);
286 }
287 spin_unlock(&tbl->slot_tbl_lock);
288 return 0;
289}
290
291static int nfs4_begin_drain_session(struct nfs_client *clp)
292{
293 struct nfs4_session *ses = clp->cl_session;
294 int ret;
295
296 if (clp->cl_slot_tbl)
297 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
298
299 /* back channel */
300 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
301 if (ret)
302 return ret;
303 /* fore channel */
304 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
305}
306
307#if defined(CONFIG_NFS_V4_1)
308
309static void nfs41_finish_session_reset(struct nfs_client *clp)
310{
311 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
312 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
313 /* create_session negotiated new slot table */
314 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
315 nfs4_setup_state_renewal(clp);
316}
317
318int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
319{
320 int status;
321
322 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
323 goto do_confirm;
324 status = nfs4_proc_exchange_id(clp, cred);
325 if (status != 0)
326 goto out;
327 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
328do_confirm:
329 status = nfs4_proc_create_session(clp, cred);
330 if (status != 0)
331 goto out;
332 nfs41_finish_session_reset(clp);
333 nfs_mark_client_ready(clp, NFS_CS_READY);
334out:
335 return status;
336}
337
338/**
339 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
340 *
341 * @clp: nfs_client under test
342 * @result: OUT: found nfs_client, or clp
343 * @cred: credential to use for trunking test
344 *
345 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
346 * If NFS4_OK is returned, an nfs_client pointer is planted in
347 * "result".
348 *
349 * Note: The returned client may not yet be marked ready.
350 */
351int nfs41_discover_server_trunking(struct nfs_client *clp,
352 struct nfs_client **result,
353 const struct cred *cred)
354{
355 int status;
356
357 status = nfs4_proc_exchange_id(clp, cred);
358 if (status != NFS4_OK)
359 return status;
360
361 status = nfs41_walk_client_list(clp, result, cred);
362 if (status < 0)
363 return status;
364 if (clp != *result)
365 return 0;
366
367 /*
368 * Purge state if the client id was established in a prior
369 * instance and the client id could not have arrived on the
370 * server via Transparent State Migration.
371 */
372 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
373 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
374 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
375 else
376 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
377 }
378 nfs4_schedule_state_manager(clp);
379 status = nfs_wait_client_init_complete(clp);
380 if (status < 0)
381 nfs_put_client(clp);
382 return status;
383}
384
385#endif /* CONFIG_NFS_V4_1 */
386
387/**
388 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
389 * @clp: client state handle
390 *
391 * Returns a cred with reference count bumped, or NULL.
392 */
393const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
394{
395 const struct cred *cred;
396
397 cred = nfs4_get_machine_cred(clp);
398 return cred;
399}
400
401static struct nfs4_state_owner *
402nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
403{
404 struct rb_node **p = &server->state_owners.rb_node,
405 *parent = NULL;
406 struct nfs4_state_owner *sp;
407 int cmp;
408
409 while (*p != NULL) {
410 parent = *p;
411 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
412 cmp = cred_fscmp(cred, sp->so_cred);
413
414 if (cmp < 0)
415 p = &parent->rb_left;
416 else if (cmp > 0)
417 p = &parent->rb_right;
418 else {
419 if (!list_empty(&sp->so_lru))
420 list_del_init(&sp->so_lru);
421 atomic_inc(&sp->so_count);
422 return sp;
423 }
424 }
425 return NULL;
426}
427
428static struct nfs4_state_owner *
429nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
430{
431 struct nfs_server *server = new->so_server;
432 struct rb_node **p = &server->state_owners.rb_node,
433 *parent = NULL;
434 struct nfs4_state_owner *sp;
435 int cmp;
436
437 while (*p != NULL) {
438 parent = *p;
439 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
440 cmp = cred_fscmp(new->so_cred, sp->so_cred);
441
442 if (cmp < 0)
443 p = &parent->rb_left;
444 else if (cmp > 0)
445 p = &parent->rb_right;
446 else {
447 if (!list_empty(&sp->so_lru))
448 list_del_init(&sp->so_lru);
449 atomic_inc(&sp->so_count);
450 return sp;
451 }
452 }
453 rb_link_node(&new->so_server_node, parent, p);
454 rb_insert_color(&new->so_server_node, &server->state_owners);
455 return new;
456}
457
458static void
459nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
460{
461 struct nfs_server *server = sp->so_server;
462
463 if (!RB_EMPTY_NODE(&sp->so_server_node))
464 rb_erase(&sp->so_server_node, &server->state_owners);
465}
466
467static void
468nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
469{
470 sc->create_time = ktime_get();
471 sc->flags = 0;
472 sc->counter = 0;
473 spin_lock_init(&sc->lock);
474 INIT_LIST_HEAD(&sc->list);
475 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
476}
477
478static void
479nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
480{
481 rpc_destroy_wait_queue(&sc->wait);
482}
483
484/*
485 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
486 * create a new state_owner.
487 *
488 */
489static struct nfs4_state_owner *
490nfs4_alloc_state_owner(struct nfs_server *server,
491 const struct cred *cred,
492 gfp_t gfp_flags)
493{
494 struct nfs4_state_owner *sp;
495
496 sp = kzalloc(sizeof(*sp), gfp_flags);
497 if (!sp)
498 return NULL;
499 sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
500 gfp_flags);
501 if (sp->so_seqid.owner_id < 0) {
502 kfree(sp);
503 return NULL;
504 }
505 sp->so_server = server;
506 sp->so_cred = get_cred(cred);
507 spin_lock_init(&sp->so_lock);
508 INIT_LIST_HEAD(&sp->so_states);
509 nfs4_init_seqid_counter(&sp->so_seqid);
510 atomic_set(&sp->so_count, 1);
511 INIT_LIST_HEAD(&sp->so_lru);
512 seqcount_spinlock_init(&sp->so_reclaim_seqcount, &sp->so_lock);
513 mutex_init(&sp->so_delegreturn_mutex);
514 return sp;
515}
516
517static void
518nfs4_reset_state_owner(struct nfs4_state_owner *sp)
519{
520 /* This state_owner is no longer usable, but must
521 * remain in place so that state recovery can find it
522 * and the opens associated with it.
523 * It may also be used for new 'open' request to
524 * return a delegation to the server.
525 * So update the 'create_time' so that it looks like
526 * a new state_owner. This will cause the server to
527 * request an OPEN_CONFIRM to start a new sequence.
528 */
529 sp->so_seqid.create_time = ktime_get();
530}
531
532static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
533{
534 nfs4_destroy_seqid_counter(&sp->so_seqid);
535 put_cred(sp->so_cred);
536 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
537 kfree(sp);
538}
539
540static void nfs4_gc_state_owners(struct nfs_server *server)
541{
542 struct nfs_client *clp = server->nfs_client;
543 struct nfs4_state_owner *sp, *tmp;
544 unsigned long time_min, time_max;
545 LIST_HEAD(doomed);
546
547 spin_lock(&clp->cl_lock);
548 time_max = jiffies;
549 time_min = (long)time_max - (long)clp->cl_lease_time;
550 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
551 /* NB: LRU is sorted so that oldest is at the head */
552 if (time_in_range(sp->so_expires, time_min, time_max))
553 break;
554 list_move(&sp->so_lru, &doomed);
555 nfs4_remove_state_owner_locked(sp);
556 }
557 spin_unlock(&clp->cl_lock);
558
559 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
560 list_del(&sp->so_lru);
561 nfs4_free_state_owner(sp);
562 }
563}
564
565/**
566 * nfs4_get_state_owner - Look up a state owner given a credential
567 * @server: nfs_server to search
568 * @cred: RPC credential to match
569 * @gfp_flags: allocation mode
570 *
571 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
572 */
573struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
574 const struct cred *cred,
575 gfp_t gfp_flags)
576{
577 struct nfs_client *clp = server->nfs_client;
578 struct nfs4_state_owner *sp, *new;
579
580 spin_lock(&clp->cl_lock);
581 sp = nfs4_find_state_owner_locked(server, cred);
582 spin_unlock(&clp->cl_lock);
583 if (sp != NULL)
584 goto out;
585 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
586 if (new == NULL)
587 goto out;
588 spin_lock(&clp->cl_lock);
589 sp = nfs4_insert_state_owner_locked(new);
590 spin_unlock(&clp->cl_lock);
591 if (sp != new)
592 nfs4_free_state_owner(new);
593out:
594 nfs4_gc_state_owners(server);
595 return sp;
596}
597
598/**
599 * nfs4_put_state_owner - Release a nfs4_state_owner
600 * @sp: state owner data to release
601 *
602 * Note that we keep released state owners on an LRU
603 * list.
604 * This caches valid state owners so that they can be
605 * reused, to avoid the OPEN_CONFIRM on minor version 0.
606 * It also pins the uniquifier of dropped state owners for
607 * a while, to ensure that those state owner names are
608 * never reused.
609 */
610void nfs4_put_state_owner(struct nfs4_state_owner *sp)
611{
612 struct nfs_server *server = sp->so_server;
613 struct nfs_client *clp = server->nfs_client;
614
615 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
616 return;
617
618 sp->so_expires = jiffies;
619 list_add_tail(&sp->so_lru, &server->state_owners_lru);
620 spin_unlock(&clp->cl_lock);
621}
622
623/**
624 * nfs4_purge_state_owners - Release all cached state owners
625 * @server: nfs_server with cached state owners to release
626 * @head: resulting list of state owners
627 *
628 * Called at umount time. Remaining state owners will be on
629 * the LRU with ref count of zero.
630 * Note that the state owners are not freed, but are added
631 * to the list @head, which can later be used as an argument
632 * to nfs4_free_state_owners.
633 */
634void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
635{
636 struct nfs_client *clp = server->nfs_client;
637 struct nfs4_state_owner *sp, *tmp;
638
639 spin_lock(&clp->cl_lock);
640 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
641 list_move(&sp->so_lru, head);
642 nfs4_remove_state_owner_locked(sp);
643 }
644 spin_unlock(&clp->cl_lock);
645}
646
647/**
648 * nfs4_free_state_owners - Release all cached state owners
649 * @head: resulting list of state owners
650 *
651 * Frees a list of state owners that was generated by
652 * nfs4_purge_state_owners
653 */
654void nfs4_free_state_owners(struct list_head *head)
655{
656 struct nfs4_state_owner *sp, *tmp;
657
658 list_for_each_entry_safe(sp, tmp, head, so_lru) {
659 list_del(&sp->so_lru);
660 nfs4_free_state_owner(sp);
661 }
662}
663
664static struct nfs4_state *
665nfs4_alloc_open_state(void)
666{
667 struct nfs4_state *state;
668
669 state = kzalloc(sizeof(*state), GFP_NOFS);
670 if (!state)
671 return NULL;
672 refcount_set(&state->count, 1);
673 INIT_LIST_HEAD(&state->lock_states);
674 spin_lock_init(&state->state_lock);
675 seqlock_init(&state->seqlock);
676 init_waitqueue_head(&state->waitq);
677 return state;
678}
679
680void
681nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
682{
683 if (state->state == fmode)
684 return;
685 /* NB! List reordering - see the reclaim code for why. */
686 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
687 if (fmode & FMODE_WRITE)
688 list_move(&state->open_states, &state->owner->so_states);
689 else
690 list_move_tail(&state->open_states, &state->owner->so_states);
691 }
692 state->state = fmode;
693}
694
695static struct nfs4_state *
696__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
697{
698 struct nfs_inode *nfsi = NFS_I(inode);
699 struct nfs4_state *state;
700
701 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
702 if (state->owner != owner)
703 continue;
704 if (!nfs4_valid_open_stateid(state))
705 continue;
706 if (refcount_inc_not_zero(&state->count))
707 return state;
708 }
709 return NULL;
710}
711
712static void
713nfs4_free_open_state(struct nfs4_state *state)
714{
715 kfree_rcu(state, rcu_head);
716}
717
718struct nfs4_state *
719nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
720{
721 struct nfs4_state *state, *new;
722 struct nfs_inode *nfsi = NFS_I(inode);
723
724 rcu_read_lock();
725 state = __nfs4_find_state_byowner(inode, owner);
726 rcu_read_unlock();
727 if (state)
728 goto out;
729 new = nfs4_alloc_open_state();
730 spin_lock(&owner->so_lock);
731 spin_lock(&inode->i_lock);
732 state = __nfs4_find_state_byowner(inode, owner);
733 if (state == NULL && new != NULL) {
734 state = new;
735 state->owner = owner;
736 atomic_inc(&owner->so_count);
737 ihold(inode);
738 state->inode = inode;
739 list_add_rcu(&state->inode_states, &nfsi->open_states);
740 spin_unlock(&inode->i_lock);
741 /* Note: The reclaim code dictates that we add stateless
742 * and read-only stateids to the end of the list */
743 list_add_tail(&state->open_states, &owner->so_states);
744 spin_unlock(&owner->so_lock);
745 } else {
746 spin_unlock(&inode->i_lock);
747 spin_unlock(&owner->so_lock);
748 if (new)
749 nfs4_free_open_state(new);
750 }
751out:
752 return state;
753}
754
755void nfs4_put_open_state(struct nfs4_state *state)
756{
757 struct inode *inode = state->inode;
758 struct nfs4_state_owner *owner = state->owner;
759
760 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
761 return;
762 spin_lock(&inode->i_lock);
763 list_del_rcu(&state->inode_states);
764 list_del(&state->open_states);
765 spin_unlock(&inode->i_lock);
766 spin_unlock(&owner->so_lock);
767 nfs4_inode_return_delegation_on_close(inode);
768 iput(inode);
769 nfs4_free_open_state(state);
770 nfs4_put_state_owner(owner);
771}
772
773/*
774 * Close the current file.
775 */
776static void __nfs4_close(struct nfs4_state *state,
777 fmode_t fmode, gfp_t gfp_mask, int wait)
778{
779 struct nfs4_state_owner *owner = state->owner;
780 int call_close = 0;
781 fmode_t newstate;
782
783 atomic_inc(&owner->so_count);
784 /* Protect against nfs4_find_state() */
785 spin_lock(&owner->so_lock);
786 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
787 case FMODE_READ:
788 state->n_rdonly--;
789 break;
790 case FMODE_WRITE:
791 state->n_wronly--;
792 break;
793 case FMODE_READ|FMODE_WRITE:
794 state->n_rdwr--;
795 }
796 newstate = FMODE_READ|FMODE_WRITE;
797 if (state->n_rdwr == 0) {
798 if (state->n_rdonly == 0) {
799 newstate &= ~FMODE_READ;
800 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
801 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
802 }
803 if (state->n_wronly == 0) {
804 newstate &= ~FMODE_WRITE;
805 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
806 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
807 }
808 if (newstate == 0)
809 clear_bit(NFS_DELEGATED_STATE, &state->flags);
810 }
811 nfs4_state_set_mode_locked(state, newstate);
812 spin_unlock(&owner->so_lock);
813
814 if (!call_close) {
815 nfs4_put_open_state(state);
816 nfs4_put_state_owner(owner);
817 } else
818 nfs4_do_close(state, gfp_mask, wait);
819}
820
821void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
822{
823 __nfs4_close(state, fmode, GFP_NOFS, 0);
824}
825
826void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
827{
828 __nfs4_close(state, fmode, GFP_KERNEL, 1);
829}
830
831/*
832 * Search the state->lock_states for an existing lock_owner
833 * that is compatible with either of the given owners.
834 * If the second is non-zero, then the first refers to a Posix-lock
835 * owner (current->files) and the second refers to a flock/OFD
836 * owner (struct file*). In that case, prefer a match for the first
837 * owner.
838 * If both sorts of locks are held on the one file we cannot know
839 * which stateid was intended to be used, so a "correct" choice cannot
840 * be made. Failing that, a "consistent" choice is preferable. The
841 * consistent choice we make is to prefer the first owner, that of a
842 * Posix lock.
843 */
844static struct nfs4_lock_state *
845__nfs4_find_lock_state(struct nfs4_state *state,
846 fl_owner_t fl_owner, fl_owner_t fl_owner2)
847{
848 struct nfs4_lock_state *pos, *ret = NULL;
849 list_for_each_entry(pos, &state->lock_states, ls_locks) {
850 if (pos->ls_owner == fl_owner) {
851 ret = pos;
852 break;
853 }
854 if (pos->ls_owner == fl_owner2)
855 ret = pos;
856 }
857 if (ret)
858 refcount_inc(&ret->ls_count);
859 return ret;
860}
861
862/*
863 * Return a compatible lock_state. If no initialized lock_state structure
864 * exists, return an uninitialized one.
865 *
866 */
867static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
868{
869 struct nfs4_lock_state *lsp;
870 struct nfs_server *server = state->owner->so_server;
871
872 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
873 if (lsp == NULL)
874 return NULL;
875 nfs4_init_seqid_counter(&lsp->ls_seqid);
876 refcount_set(&lsp->ls_count, 1);
877 lsp->ls_state = state;
878 lsp->ls_owner = fl_owner;
879 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
880 if (lsp->ls_seqid.owner_id < 0)
881 goto out_free;
882 INIT_LIST_HEAD(&lsp->ls_locks);
883 return lsp;
884out_free:
885 kfree(lsp);
886 return NULL;
887}
888
889void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
890{
891 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
892 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
893 kfree(lsp);
894}
895
896/*
897 * Return a compatible lock_state. If no initialized lock_state structure
898 * exists, return an uninitialized one.
899 *
900 */
901static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
902{
903 struct nfs4_lock_state *lsp, *new = NULL;
904
905 for(;;) {
906 spin_lock(&state->state_lock);
907 lsp = __nfs4_find_lock_state(state, owner, NULL);
908 if (lsp != NULL)
909 break;
910 if (new != NULL) {
911 list_add(&new->ls_locks, &state->lock_states);
912 set_bit(LK_STATE_IN_USE, &state->flags);
913 lsp = new;
914 new = NULL;
915 break;
916 }
917 spin_unlock(&state->state_lock);
918 new = nfs4_alloc_lock_state(state, owner);
919 if (new == NULL)
920 return NULL;
921 }
922 spin_unlock(&state->state_lock);
923 if (new != NULL)
924 nfs4_free_lock_state(state->owner->so_server, new);
925 return lsp;
926}
927
928/*
929 * Release reference to lock_state, and free it if we see that
930 * it is no longer in use
931 */
932void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
933{
934 struct nfs_server *server;
935 struct nfs4_state *state;
936
937 if (lsp == NULL)
938 return;
939 state = lsp->ls_state;
940 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
941 return;
942 list_del(&lsp->ls_locks);
943 if (list_empty(&state->lock_states))
944 clear_bit(LK_STATE_IN_USE, &state->flags);
945 spin_unlock(&state->state_lock);
946 server = state->owner->so_server;
947 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
948 struct nfs_client *clp = server->nfs_client;
949
950 clp->cl_mvops->free_lock_state(server, lsp);
951 } else
952 nfs4_free_lock_state(server, lsp);
953}
954
955static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
956{
957 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
958
959 dst->fl_u.nfs4_fl.owner = lsp;
960 refcount_inc(&lsp->ls_count);
961}
962
963static void nfs4_fl_release_lock(struct file_lock *fl)
964{
965 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
966}
967
968static const struct file_lock_operations nfs4_fl_lock_ops = {
969 .fl_copy_lock = nfs4_fl_copy_lock,
970 .fl_release_private = nfs4_fl_release_lock,
971};
972
973int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
974{
975 struct nfs4_lock_state *lsp;
976
977 if (fl->fl_ops != NULL)
978 return 0;
979 lsp = nfs4_get_lock_state(state, fl->fl_owner);
980 if (lsp == NULL)
981 return -ENOMEM;
982 fl->fl_u.nfs4_fl.owner = lsp;
983 fl->fl_ops = &nfs4_fl_lock_ops;
984 return 0;
985}
986
987static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
988 struct nfs4_state *state,
989 const struct nfs_lock_context *l_ctx)
990{
991 struct nfs4_lock_state *lsp;
992 fl_owner_t fl_owner, fl_flock_owner;
993 int ret = -ENOENT;
994
995 if (l_ctx == NULL)
996 goto out;
997
998 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
999 goto out;
1000
1001 fl_owner = l_ctx->lockowner;
1002 fl_flock_owner = l_ctx->open_context->flock_owner;
1003
1004 spin_lock(&state->state_lock);
1005 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
1006 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1007 ret = -EIO;
1008 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1009 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1010 ret = 0;
1011 }
1012 spin_unlock(&state->state_lock);
1013 nfs4_put_lock_state(lsp);
1014out:
1015 return ret;
1016}
1017
1018bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1019{
1020 bool ret;
1021 const nfs4_stateid *src;
1022 int seq;
1023
1024 do {
1025 ret = false;
1026 src = &zero_stateid;
1027 seq = read_seqbegin(&state->seqlock);
1028 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1029 src = &state->open_stateid;
1030 ret = true;
1031 }
1032 nfs4_stateid_copy(dst, src);
1033 } while (read_seqretry(&state->seqlock, seq));
1034 return ret;
1035}
1036
1037/*
1038 * Byte-range lock aware utility to initialize the stateid of read/write
1039 * requests.
1040 */
1041int nfs4_select_rw_stateid(struct nfs4_state *state,
1042 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1043 nfs4_stateid *dst, const struct cred **cred)
1044{
1045 int ret;
1046
1047 if (!nfs4_valid_open_stateid(state))
1048 return -EIO;
1049 if (cred != NULL)
1050 *cred = NULL;
1051 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1052 if (ret == -EIO)
1053 /* A lost lock - don't even consider delegations */
1054 goto out;
1055 /* returns true if delegation stateid found and copied */
1056 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1057 ret = 0;
1058 goto out;
1059 }
1060 if (ret != -ENOENT)
1061 /* nfs4_copy_delegation_stateid() didn't over-write
1062 * dst, so it still has the lock stateid which we now
1063 * choose to use.
1064 */
1065 goto out;
1066 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1067out:
1068 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1069 dst->seqid = 0;
1070 return ret;
1071}
1072
1073struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1074{
1075 struct nfs_seqid *new;
1076
1077 new = kmalloc(sizeof(*new), gfp_mask);
1078 if (new == NULL)
1079 return ERR_PTR(-ENOMEM);
1080 new->sequence = counter;
1081 INIT_LIST_HEAD(&new->list);
1082 new->task = NULL;
1083 return new;
1084}
1085
1086void nfs_release_seqid(struct nfs_seqid *seqid)
1087{
1088 struct nfs_seqid_counter *sequence;
1089
1090 if (seqid == NULL || list_empty(&seqid->list))
1091 return;
1092 sequence = seqid->sequence;
1093 spin_lock(&sequence->lock);
1094 list_del_init(&seqid->list);
1095 if (!list_empty(&sequence->list)) {
1096 struct nfs_seqid *next;
1097
1098 next = list_first_entry(&sequence->list,
1099 struct nfs_seqid, list);
1100 rpc_wake_up_queued_task(&sequence->wait, next->task);
1101 }
1102 spin_unlock(&sequence->lock);
1103}
1104
1105void nfs_free_seqid(struct nfs_seqid *seqid)
1106{
1107 nfs_release_seqid(seqid);
1108 kfree(seqid);
1109}
1110
1111/*
1112 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1113 * failed with a seqid incrementing error -
1114 * see comments nfs4.h:seqid_mutating_error()
1115 */
1116static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1117{
1118 switch (status) {
1119 case 0:
1120 break;
1121 case -NFS4ERR_BAD_SEQID:
1122 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1123 return;
1124 pr_warn_ratelimited("NFS: v4 server returned a bad"
1125 " sequence-id error on an"
1126 " unconfirmed sequence %p!\n",
1127 seqid->sequence);
1128 return;
1129 case -NFS4ERR_STALE_CLIENTID:
1130 case -NFS4ERR_STALE_STATEID:
1131 case -NFS4ERR_BAD_STATEID:
1132 case -NFS4ERR_BADXDR:
1133 case -NFS4ERR_RESOURCE:
1134 case -NFS4ERR_NOFILEHANDLE:
1135 case -NFS4ERR_MOVED:
1136 /* Non-seqid mutating errors */
1137 return;
1138 }
1139 /*
1140 * Note: no locking needed as we are guaranteed to be first
1141 * on the sequence list
1142 */
1143 seqid->sequence->counter++;
1144}
1145
1146void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1147{
1148 struct nfs4_state_owner *sp;
1149
1150 if (seqid == NULL)
1151 return;
1152
1153 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1154 if (status == -NFS4ERR_BAD_SEQID)
1155 nfs4_reset_state_owner(sp);
1156 if (!nfs4_has_session(sp->so_server->nfs_client))
1157 nfs_increment_seqid(status, seqid);
1158}
1159
1160/*
1161 * Increment the seqid if the LOCK/LOCKU succeeded, or
1162 * failed with a seqid incrementing error -
1163 * see comments nfs4.h:seqid_mutating_error()
1164 */
1165void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1166{
1167 if (seqid != NULL)
1168 nfs_increment_seqid(status, seqid);
1169}
1170
1171int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1172{
1173 struct nfs_seqid_counter *sequence;
1174 int status = 0;
1175
1176 if (seqid == NULL)
1177 goto out;
1178 sequence = seqid->sequence;
1179 spin_lock(&sequence->lock);
1180 seqid->task = task;
1181 if (list_empty(&seqid->list))
1182 list_add_tail(&seqid->list, &sequence->list);
1183 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1184 goto unlock;
1185 rpc_sleep_on(&sequence->wait, task, NULL);
1186 status = -EAGAIN;
1187unlock:
1188 spin_unlock(&sequence->lock);
1189out:
1190 return status;
1191}
1192
1193static int nfs4_run_state_manager(void *);
1194
1195static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1196{
1197 smp_mb__before_atomic();
1198 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1199 smp_mb__after_atomic();
1200 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1201 rpc_wake_up(&clp->cl_rpcwaitq);
1202}
1203
1204/*
1205 * Schedule the nfs_client asynchronous state management routine
1206 */
1207void nfs4_schedule_state_manager(struct nfs_client *clp)
1208{
1209 struct task_struct *task;
1210 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1211
1212 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1213 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1214 return;
1215 __module_get(THIS_MODULE);
1216 refcount_inc(&clp->cl_count);
1217
1218 /* The rcu_read_lock() is not strictly necessary, as the state
1219 * manager is the only thread that ever changes the rpc_xprt
1220 * after it's initialized. At this point, we're single threaded. */
1221 rcu_read_lock();
1222 snprintf(buf, sizeof(buf), "%s-manager",
1223 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1224 rcu_read_unlock();
1225 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1226 if (IS_ERR(task)) {
1227 printk(KERN_ERR "%s: kthread_run: %ld\n",
1228 __func__, PTR_ERR(task));
1229 nfs4_clear_state_manager_bit(clp);
1230 nfs_put_client(clp);
1231 module_put(THIS_MODULE);
1232 }
1233}
1234
1235/*
1236 * Schedule a lease recovery attempt
1237 */
1238void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1239{
1240 if (!clp)
1241 return;
1242 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1243 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1244 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1245 clp->cl_hostname);
1246 nfs4_schedule_state_manager(clp);
1247}
1248EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1249
1250/**
1251 * nfs4_schedule_migration_recovery - trigger migration recovery
1252 *
1253 * @server: FSID that is migrating
1254 *
1255 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1256 * value is returned.
1257 */
1258int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1259{
1260 struct nfs_client *clp = server->nfs_client;
1261
1262 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1263 pr_err("NFS: volatile file handles not supported (server %s)\n",
1264 clp->cl_hostname);
1265 return -NFS4ERR_IO;
1266 }
1267
1268 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1269 return -NFS4ERR_IO;
1270
1271 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1272 __func__,
1273 (unsigned long long)server->fsid.major,
1274 (unsigned long long)server->fsid.minor,
1275 clp->cl_hostname);
1276
1277 set_bit(NFS_MIG_IN_TRANSITION,
1278 &((struct nfs_server *)server)->mig_status);
1279 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1280
1281 nfs4_schedule_state_manager(clp);
1282 return 0;
1283}
1284EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1285
1286/**
1287 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1288 *
1289 * @clp: server to check for moved leases
1290 *
1291 */
1292void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1293{
1294 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1295 __func__, clp->cl_clientid, clp->cl_hostname);
1296
1297 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1298 nfs4_schedule_state_manager(clp);
1299}
1300EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1301
1302int nfs4_wait_clnt_recover(struct nfs_client *clp)
1303{
1304 int res;
1305
1306 might_sleep();
1307
1308 refcount_inc(&clp->cl_count);
1309 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1310 nfs_wait_bit_killable, TASK_KILLABLE);
1311 if (res)
1312 goto out;
1313 if (clp->cl_cons_state < 0)
1314 res = clp->cl_cons_state;
1315out:
1316 nfs_put_client(clp);
1317 return res;
1318}
1319
1320int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1321{
1322 unsigned int loop;
1323 int ret;
1324
1325 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1326 ret = nfs4_wait_clnt_recover(clp);
1327 if (ret != 0)
1328 break;
1329 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1330 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1331 break;
1332 nfs4_schedule_state_manager(clp);
1333 ret = -EIO;
1334 }
1335 return ret;
1336}
1337
1338/*
1339 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1340 * @clp: client to process
1341 *
1342 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1343 * resend of the SETCLIENTID and hence re-establish the
1344 * callback channel. Then return all existing delegations.
1345 */
1346static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1347{
1348 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1349 nfs_expire_all_delegations(clp);
1350 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1351 clp->cl_hostname);
1352}
1353
1354void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1355{
1356 nfs40_handle_cb_pathdown(clp);
1357 nfs4_schedule_state_manager(clp);
1358}
1359
1360static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1361{
1362
1363 if (!nfs4_valid_open_stateid(state))
1364 return 0;
1365 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1366 /* Don't recover state that expired before the reboot */
1367 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1368 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1369 return 0;
1370 }
1371 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1372 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1373 return 1;
1374}
1375
1376int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1377{
1378 if (!nfs4_valid_open_stateid(state))
1379 return 0;
1380 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1381 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1382 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1383 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1384 return 1;
1385}
1386
1387int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1388{
1389 struct nfs_client *clp = server->nfs_client;
1390
1391 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1392 return -EBADF;
1393 nfs_inode_find_delegation_state_and_recover(state->inode,
1394 &state->stateid);
1395 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1396 clp->cl_hostname);
1397 nfs4_schedule_state_manager(clp);
1398 return 0;
1399}
1400EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1401
1402static struct nfs4_lock_state *
1403nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1404 const nfs4_stateid *stateid)
1405{
1406 struct nfs4_lock_state *pos;
1407
1408 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1409 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1410 continue;
1411 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1412 return pos;
1413 }
1414 return NULL;
1415}
1416
1417static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1418 const nfs4_stateid *stateid)
1419{
1420 bool found = false;
1421
1422 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1423 spin_lock(&state->state_lock);
1424 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1425 found = true;
1426 spin_unlock(&state->state_lock);
1427 }
1428 return found;
1429}
1430
1431void nfs_inode_find_state_and_recover(struct inode *inode,
1432 const nfs4_stateid *stateid)
1433{
1434 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1435 struct nfs_inode *nfsi = NFS_I(inode);
1436 struct nfs_open_context *ctx;
1437 struct nfs4_state *state;
1438 bool found = false;
1439
1440 rcu_read_lock();
1441 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1442 state = ctx->state;
1443 if (state == NULL)
1444 continue;
1445 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1446 nfs4_state_mark_reclaim_nograce(clp, state)) {
1447 found = true;
1448 continue;
1449 }
1450 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1451 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
1452 nfs4_state_mark_reclaim_nograce(clp, state)) {
1453 found = true;
1454 continue;
1455 }
1456 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1457 nfs4_state_mark_reclaim_nograce(clp, state))
1458 found = true;
1459 }
1460 rcu_read_unlock();
1461
1462 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1463 if (found)
1464 nfs4_schedule_state_manager(clp);
1465}
1466
1467static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1468{
1469 struct inode *inode = state->inode;
1470 struct nfs_inode *nfsi = NFS_I(inode);
1471 struct nfs_open_context *ctx;
1472
1473 rcu_read_lock();
1474 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1475 if (ctx->state != state)
1476 continue;
1477 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1478 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1479 "error = %d\n", ctx->dentry, err);
1480 }
1481 rcu_read_unlock();
1482}
1483
1484static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1485{
1486 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1487 nfs4_state_mark_open_context_bad(state, error);
1488}
1489
1490
1491static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1492{
1493 struct inode *inode = state->inode;
1494 struct nfs_inode *nfsi = NFS_I(inode);
1495 struct file_lock *fl;
1496 struct nfs4_lock_state *lsp;
1497 int status = 0;
1498 struct file_lock_context *flctx = inode->i_flctx;
1499 struct list_head *list;
1500
1501 if (flctx == NULL)
1502 return 0;
1503
1504 list = &flctx->flc_posix;
1505
1506 /* Guard against delegation returns and new lock/unlock calls */
1507 down_write(&nfsi->rwsem);
1508 spin_lock(&flctx->flc_lock);
1509restart:
1510 list_for_each_entry(fl, list, fl_list) {
1511 if (nfs_file_open_context(fl->fl_file)->state != state)
1512 continue;
1513 spin_unlock(&flctx->flc_lock);
1514 status = ops->recover_lock(state, fl);
1515 switch (status) {
1516 case 0:
1517 break;
1518 case -ETIMEDOUT:
1519 case -ESTALE:
1520 case -NFS4ERR_ADMIN_REVOKED:
1521 case -NFS4ERR_STALE_STATEID:
1522 case -NFS4ERR_BAD_STATEID:
1523 case -NFS4ERR_EXPIRED:
1524 case -NFS4ERR_NO_GRACE:
1525 case -NFS4ERR_STALE_CLIENTID:
1526 case -NFS4ERR_BADSESSION:
1527 case -NFS4ERR_BADSLOT:
1528 case -NFS4ERR_BAD_HIGH_SLOT:
1529 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1530 goto out;
1531 default:
1532 pr_err("NFS: %s: unhandled error %d\n",
1533 __func__, status);
1534 fallthrough;
1535 case -ENOMEM:
1536 case -NFS4ERR_DENIED:
1537 case -NFS4ERR_RECLAIM_BAD:
1538 case -NFS4ERR_RECLAIM_CONFLICT:
1539 lsp = fl->fl_u.nfs4_fl.owner;
1540 if (lsp)
1541 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1542 status = 0;
1543 }
1544 spin_lock(&flctx->flc_lock);
1545 }
1546 if (list == &flctx->flc_posix) {
1547 list = &flctx->flc_flock;
1548 goto restart;
1549 }
1550 spin_unlock(&flctx->flc_lock);
1551out:
1552 up_write(&nfsi->rwsem);
1553 return status;
1554}
1555
1556#ifdef CONFIG_NFS_V4_2
1557static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1558{
1559 struct nfs4_copy_state *copy;
1560
1561 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1562 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1563 return;
1564
1565 spin_lock(&sp->so_server->nfs_client->cl_lock);
1566 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1567 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1568 !nfs4_stateid_match_other(&state->stateid,
1569 ©->parent_dst_state->stateid)))
1570 continue;
1571 copy->flags = 1;
1572 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1573 &state->flags)) {
1574 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1575 complete(©->completion);
1576 }
1577 }
1578 list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
1579 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1580 !nfs4_stateid_match_other(&state->stateid,
1581 ©->parent_src_state->stateid)))
1582 continue;
1583 copy->flags = 1;
1584 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1585 &state->flags))
1586 complete(©->completion);
1587 }
1588 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1589}
1590#else /* !CONFIG_NFS_V4_2 */
1591static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1592 struct nfs4_state *state)
1593{
1594}
1595#endif /* CONFIG_NFS_V4_2 */
1596
1597static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1598 const struct nfs4_state_recovery_ops *ops)
1599{
1600 struct nfs4_lock_state *lock;
1601 int status;
1602
1603 status = ops->recover_open(sp, state);
1604 if (status < 0)
1605 return status;
1606
1607 status = nfs4_reclaim_locks(state, ops);
1608 if (status < 0)
1609 return status;
1610
1611 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1612 spin_lock(&state->state_lock);
1613 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1614 trace_nfs4_state_lock_reclaim(state, lock);
1615 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1616 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__);
1617 }
1618 spin_unlock(&state->state_lock);
1619 }
1620
1621 nfs42_complete_copies(sp, state);
1622 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1623 return status;
1624}
1625
1626static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1627{
1628 struct nfs4_state *state;
1629 unsigned int loop = 0;
1630 int status = 0;
1631#ifdef CONFIG_NFS_V4_2
1632 bool found_ssc_copy_state = false;
1633#endif /* CONFIG_NFS_V4_2 */
1634
1635 /* Note: we rely on the sp->so_states list being ordered
1636 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1637 * states first.
1638 * This is needed to ensure that the server won't give us any
1639 * read delegations that we have to return if, say, we are
1640 * recovering after a network partition or a reboot from a
1641 * server that doesn't support a grace period.
1642 */
1643 spin_lock(&sp->so_lock);
1644 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1645restart:
1646 list_for_each_entry(state, &sp->so_states, open_states) {
1647 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1648 continue;
1649 if (!nfs4_valid_open_stateid(state))
1650 continue;
1651 if (state->state == 0)
1652 continue;
1653#ifdef CONFIG_NFS_V4_2
1654 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1655 nfs4_state_mark_recovery_failed(state, -EIO);
1656 found_ssc_copy_state = true;
1657 continue;
1658 }
1659#endif /* CONFIG_NFS_V4_2 */
1660 refcount_inc(&state->count);
1661 spin_unlock(&sp->so_lock);
1662 status = __nfs4_reclaim_open_state(sp, state, ops);
1663
1664 switch (status) {
1665 default:
1666 if (status >= 0) {
1667 loop = 0;
1668 break;
1669 }
1670 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1671 fallthrough;
1672 case -ENOENT:
1673 case -ENOMEM:
1674 case -EACCES:
1675 case -EROFS:
1676 case -EIO:
1677 case -ESTALE:
1678 /* Open state on this file cannot be recovered */
1679 nfs4_state_mark_recovery_failed(state, status);
1680 break;
1681 case -EAGAIN:
1682 ssleep(1);
1683 if (loop++ < 10) {
1684 set_bit(ops->state_flag_bit, &state->flags);
1685 break;
1686 }
1687 fallthrough;
1688 case -NFS4ERR_ADMIN_REVOKED:
1689 case -NFS4ERR_STALE_STATEID:
1690 case -NFS4ERR_OLD_STATEID:
1691 case -NFS4ERR_BAD_STATEID:
1692 case -NFS4ERR_RECLAIM_BAD:
1693 case -NFS4ERR_RECLAIM_CONFLICT:
1694 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1695 break;
1696 case -NFS4ERR_EXPIRED:
1697 case -NFS4ERR_NO_GRACE:
1698 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1699 fallthrough;
1700 case -NFS4ERR_STALE_CLIENTID:
1701 case -NFS4ERR_BADSESSION:
1702 case -NFS4ERR_BADSLOT:
1703 case -NFS4ERR_BAD_HIGH_SLOT:
1704 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1705 case -ETIMEDOUT:
1706 goto out_err;
1707 }
1708 nfs4_put_open_state(state);
1709 spin_lock(&sp->so_lock);
1710 goto restart;
1711 }
1712 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1713 spin_unlock(&sp->so_lock);
1714#ifdef CONFIG_NFS_V4_2
1715 if (found_ssc_copy_state)
1716 return -EIO;
1717#endif /* CONFIG_NFS_V4_2 */
1718 return 0;
1719out_err:
1720 nfs4_put_open_state(state);
1721 spin_lock(&sp->so_lock);
1722 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1723 spin_unlock(&sp->so_lock);
1724 return status;
1725}
1726
1727static void nfs4_clear_open_state(struct nfs4_state *state)
1728{
1729 struct nfs4_lock_state *lock;
1730
1731 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1732 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1733 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1734 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1735 spin_lock(&state->state_lock);
1736 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1737 lock->ls_seqid.flags = 0;
1738 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1739 }
1740 spin_unlock(&state->state_lock);
1741}
1742
1743static void nfs4_reset_seqids(struct nfs_server *server,
1744 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1745{
1746 struct nfs_client *clp = server->nfs_client;
1747 struct nfs4_state_owner *sp;
1748 struct rb_node *pos;
1749 struct nfs4_state *state;
1750
1751 spin_lock(&clp->cl_lock);
1752 for (pos = rb_first(&server->state_owners);
1753 pos != NULL;
1754 pos = rb_next(pos)) {
1755 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1756 sp->so_seqid.flags = 0;
1757 spin_lock(&sp->so_lock);
1758 list_for_each_entry(state, &sp->so_states, open_states) {
1759 if (mark_reclaim(clp, state))
1760 nfs4_clear_open_state(state);
1761 }
1762 spin_unlock(&sp->so_lock);
1763 }
1764 spin_unlock(&clp->cl_lock);
1765}
1766
1767static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1768 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1769{
1770 struct nfs_server *server;
1771
1772 rcu_read_lock();
1773 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1774 nfs4_reset_seqids(server, mark_reclaim);
1775 rcu_read_unlock();
1776}
1777
1778static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1779{
1780 /* Mark all delegations for reclaim */
1781 nfs_delegation_mark_reclaim(clp);
1782 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1783}
1784
1785static int nfs4_reclaim_complete(struct nfs_client *clp,
1786 const struct nfs4_state_recovery_ops *ops,
1787 const struct cred *cred)
1788{
1789 /* Notify the server we're done reclaiming our state */
1790 if (ops->reclaim_complete)
1791 return ops->reclaim_complete(clp, cred);
1792 return 0;
1793}
1794
1795static void nfs4_clear_reclaim_server(struct nfs_server *server)
1796{
1797 struct nfs_client *clp = server->nfs_client;
1798 struct nfs4_state_owner *sp;
1799 struct rb_node *pos;
1800 struct nfs4_state *state;
1801
1802 spin_lock(&clp->cl_lock);
1803 for (pos = rb_first(&server->state_owners);
1804 pos != NULL;
1805 pos = rb_next(pos)) {
1806 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1807 spin_lock(&sp->so_lock);
1808 list_for_each_entry(state, &sp->so_states, open_states) {
1809 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1810 &state->flags))
1811 continue;
1812 nfs4_state_mark_reclaim_nograce(clp, state);
1813 }
1814 spin_unlock(&sp->so_lock);
1815 }
1816 spin_unlock(&clp->cl_lock);
1817}
1818
1819static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1820{
1821 struct nfs_server *server;
1822
1823 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1824 return 0;
1825
1826 rcu_read_lock();
1827 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1828 nfs4_clear_reclaim_server(server);
1829 rcu_read_unlock();
1830
1831 nfs_delegation_reap_unclaimed(clp);
1832 return 1;
1833}
1834
1835static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1836{
1837 const struct nfs4_state_recovery_ops *ops;
1838 const struct cred *cred;
1839 int err;
1840
1841 if (!nfs4_state_clear_reclaim_reboot(clp))
1842 return;
1843 ops = clp->cl_mvops->reboot_recovery_ops;
1844 cred = nfs4_get_clid_cred(clp);
1845 err = nfs4_reclaim_complete(clp, ops, cred);
1846 put_cred(cred);
1847 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1848 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1849}
1850
1851static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1852{
1853 nfs_mark_test_expired_all_delegations(clp);
1854 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1855}
1856
1857static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1858{
1859 switch (error) {
1860 case 0:
1861 break;
1862 case -NFS4ERR_CB_PATH_DOWN:
1863 nfs40_handle_cb_pathdown(clp);
1864 break;
1865 case -NFS4ERR_NO_GRACE:
1866 nfs4_state_end_reclaim_reboot(clp);
1867 break;
1868 case -NFS4ERR_STALE_CLIENTID:
1869 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1870 nfs4_state_start_reclaim_reboot(clp);
1871 break;
1872 case -NFS4ERR_EXPIRED:
1873 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1874 nfs4_state_start_reclaim_nograce(clp);
1875 break;
1876 case -NFS4ERR_BADSESSION:
1877 case -NFS4ERR_BADSLOT:
1878 case -NFS4ERR_BAD_HIGH_SLOT:
1879 case -NFS4ERR_DEADSESSION:
1880 case -NFS4ERR_SEQ_FALSE_RETRY:
1881 case -NFS4ERR_SEQ_MISORDERED:
1882 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1883 /* Zero session reset errors */
1884 break;
1885 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1886 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1887 break;
1888 default:
1889 dprintk("%s: failed to handle error %d for server %s\n",
1890 __func__, error, clp->cl_hostname);
1891 return error;
1892 }
1893 dprintk("%s: handled error %d for server %s\n", __func__, error,
1894 clp->cl_hostname);
1895 return 0;
1896}
1897
1898static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1899{
1900 struct nfs4_state_owner *sp;
1901 struct nfs_server *server;
1902 struct rb_node *pos;
1903 LIST_HEAD(freeme);
1904 int status = 0;
1905
1906restart:
1907 rcu_read_lock();
1908 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1909 nfs4_purge_state_owners(server, &freeme);
1910 spin_lock(&clp->cl_lock);
1911 for (pos = rb_first(&server->state_owners);
1912 pos != NULL;
1913 pos = rb_next(pos)) {
1914 sp = rb_entry(pos,
1915 struct nfs4_state_owner, so_server_node);
1916 if (!test_and_clear_bit(ops->owner_flag_bit,
1917 &sp->so_flags))
1918 continue;
1919 if (!atomic_inc_not_zero(&sp->so_count))
1920 continue;
1921 spin_unlock(&clp->cl_lock);
1922 rcu_read_unlock();
1923
1924 status = nfs4_reclaim_open_state(sp, ops);
1925 if (status < 0) {
1926 set_bit(ops->owner_flag_bit, &sp->so_flags);
1927 nfs4_put_state_owner(sp);
1928 status = nfs4_recovery_handle_error(clp, status);
1929 return (status != 0) ? status : -EAGAIN;
1930 }
1931
1932 nfs4_put_state_owner(sp);
1933 goto restart;
1934 }
1935 spin_unlock(&clp->cl_lock);
1936 }
1937 rcu_read_unlock();
1938 nfs4_free_state_owners(&freeme);
1939 return 0;
1940}
1941
1942static int nfs4_check_lease(struct nfs_client *clp)
1943{
1944 const struct cred *cred;
1945 const struct nfs4_state_maintenance_ops *ops =
1946 clp->cl_mvops->state_renewal_ops;
1947 int status;
1948
1949 /* Is the client already known to have an expired lease? */
1950 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1951 return 0;
1952 cred = ops->get_state_renewal_cred(clp);
1953 if (cred == NULL) {
1954 cred = nfs4_get_clid_cred(clp);
1955 status = -ENOKEY;
1956 if (cred == NULL)
1957 goto out;
1958 }
1959 status = ops->renew_lease(clp, cred);
1960 put_cred(cred);
1961 if (status == -ETIMEDOUT) {
1962 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1963 return 0;
1964 }
1965out:
1966 return nfs4_recovery_handle_error(clp, status);
1967}
1968
1969/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1970 * and for recoverable errors on EXCHANGE_ID for v4.1
1971 */
1972static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1973{
1974 switch (status) {
1975 case -NFS4ERR_SEQ_MISORDERED:
1976 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1977 return -ESERVERFAULT;
1978 /* Lease confirmation error: retry after purging the lease */
1979 ssleep(1);
1980 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1981 break;
1982 case -NFS4ERR_STALE_CLIENTID:
1983 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1984 nfs4_state_start_reclaim_reboot(clp);
1985 break;
1986 case -NFS4ERR_CLID_INUSE:
1987 pr_err("NFS: Server %s reports our clientid is in use\n",
1988 clp->cl_hostname);
1989 nfs_mark_client_ready(clp, -EPERM);
1990 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1991 return -EPERM;
1992 case -EACCES:
1993 case -NFS4ERR_DELAY:
1994 case -EAGAIN:
1995 ssleep(1);
1996 break;
1997
1998 case -NFS4ERR_MINOR_VERS_MISMATCH:
1999 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2000 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
2001 dprintk("%s: exit with error %d for server %s\n",
2002 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2003 return -EPROTONOSUPPORT;
2004 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2005 * in nfs4_exchange_id */
2006 default:
2007 dprintk("%s: exit with error %d for server %s\n", __func__,
2008 status, clp->cl_hostname);
2009 return status;
2010 }
2011 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2012 dprintk("%s: handled error %d for server %s\n", __func__, status,
2013 clp->cl_hostname);
2014 return 0;
2015}
2016
2017static int nfs4_establish_lease(struct nfs_client *clp)
2018{
2019 const struct cred *cred;
2020 const struct nfs4_state_recovery_ops *ops =
2021 clp->cl_mvops->reboot_recovery_ops;
2022 int status;
2023
2024 status = nfs4_begin_drain_session(clp);
2025 if (status != 0)
2026 return status;
2027 cred = nfs4_get_clid_cred(clp);
2028 if (cred == NULL)
2029 return -ENOENT;
2030 status = ops->establish_clid(clp, cred);
2031 put_cred(cred);
2032 if (status != 0)
2033 return status;
2034 pnfs_destroy_all_layouts(clp);
2035 return 0;
2036}
2037
2038/*
2039 * Returns zero or a negative errno. NFS4ERR values are converted
2040 * to local errno values.
2041 */
2042static int nfs4_reclaim_lease(struct nfs_client *clp)
2043{
2044 int status;
2045
2046 status = nfs4_establish_lease(clp);
2047 if (status < 0)
2048 return nfs4_handle_reclaim_lease_error(clp, status);
2049 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2050 nfs4_state_start_reclaim_nograce(clp);
2051 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2052 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2053 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2054 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2055 return 0;
2056}
2057
2058static int nfs4_purge_lease(struct nfs_client *clp)
2059{
2060 int status;
2061
2062 status = nfs4_establish_lease(clp);
2063 if (status < 0)
2064 return nfs4_handle_reclaim_lease_error(clp, status);
2065 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2066 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2067 nfs4_state_start_reclaim_nograce(clp);
2068 return 0;
2069}
2070
2071/*
2072 * Try remote migration of one FSID from a source server to a
2073 * destination server. The source server provides a list of
2074 * potential destinations.
2075 *
2076 * Returns zero or a negative NFS4ERR status code.
2077 */
2078static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2079{
2080 struct nfs_client *clp = server->nfs_client;
2081 struct nfs4_fs_locations *locations = NULL;
2082 struct inode *inode;
2083 struct page *page;
2084 int status, result;
2085
2086 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2087 (unsigned long long)server->fsid.major,
2088 (unsigned long long)server->fsid.minor,
2089 clp->cl_hostname);
2090
2091 result = 0;
2092 page = alloc_page(GFP_KERNEL);
2093 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2094 if (page == NULL || locations == NULL) {
2095 dprintk("<-- %s: no memory\n", __func__);
2096 goto out;
2097 }
2098
2099 inode = d_inode(server->super->s_root);
2100 result = nfs4_proc_get_locations(inode, locations, page, cred);
2101 if (result) {
2102 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2103 __func__, result);
2104 goto out;
2105 }
2106
2107 result = -NFS4ERR_NXIO;
2108 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2109 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2110 __func__);
2111 goto out;
2112 }
2113
2114 status = nfs4_begin_drain_session(clp);
2115 if (status != 0) {
2116 result = status;
2117 goto out;
2118 }
2119
2120 status = nfs4_replace_transport(server, locations);
2121 if (status != 0) {
2122 dprintk("<-- %s: failed to replace transport: %d\n",
2123 __func__, status);
2124 goto out;
2125 }
2126
2127 result = 0;
2128 dprintk("<-- %s: migration succeeded\n", __func__);
2129
2130out:
2131 if (page != NULL)
2132 __free_page(page);
2133 kfree(locations);
2134 if (result) {
2135 pr_err("NFS: migration recovery failed (server %s)\n",
2136 clp->cl_hostname);
2137 set_bit(NFS_MIG_FAILED, &server->mig_status);
2138 }
2139 return result;
2140}
2141
2142/*
2143 * Returns zero or a negative NFS4ERR status code.
2144 */
2145static int nfs4_handle_migration(struct nfs_client *clp)
2146{
2147 const struct nfs4_state_maintenance_ops *ops =
2148 clp->cl_mvops->state_renewal_ops;
2149 struct nfs_server *server;
2150 const struct cred *cred;
2151
2152 dprintk("%s: migration reported on \"%s\"\n", __func__,
2153 clp->cl_hostname);
2154
2155 cred = ops->get_state_renewal_cred(clp);
2156 if (cred == NULL)
2157 return -NFS4ERR_NOENT;
2158
2159 clp->cl_mig_gen++;
2160restart:
2161 rcu_read_lock();
2162 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2163 int status;
2164
2165 if (server->mig_gen == clp->cl_mig_gen)
2166 continue;
2167 server->mig_gen = clp->cl_mig_gen;
2168
2169 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2170 &server->mig_status))
2171 continue;
2172
2173 rcu_read_unlock();
2174 status = nfs4_try_migration(server, cred);
2175 if (status < 0) {
2176 put_cred(cred);
2177 return status;
2178 }
2179 goto restart;
2180 }
2181 rcu_read_unlock();
2182 put_cred(cred);
2183 return 0;
2184}
2185
2186/*
2187 * Test each nfs_server on the clp's cl_superblocks list to see
2188 * if it's moved to another server. Stop when the server no longer
2189 * returns NFS4ERR_LEASE_MOVED.
2190 */
2191static int nfs4_handle_lease_moved(struct nfs_client *clp)
2192{
2193 const struct nfs4_state_maintenance_ops *ops =
2194 clp->cl_mvops->state_renewal_ops;
2195 struct nfs_server *server;
2196 const struct cred *cred;
2197
2198 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2199 clp->cl_hostname);
2200
2201 cred = ops->get_state_renewal_cred(clp);
2202 if (cred == NULL)
2203 return -NFS4ERR_NOENT;
2204
2205 clp->cl_mig_gen++;
2206restart:
2207 rcu_read_lock();
2208 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2209 struct inode *inode;
2210 int status;
2211
2212 if (server->mig_gen == clp->cl_mig_gen)
2213 continue;
2214 server->mig_gen = clp->cl_mig_gen;
2215
2216 rcu_read_unlock();
2217
2218 inode = d_inode(server->super->s_root);
2219 status = nfs4_proc_fsid_present(inode, cred);
2220 if (status != -NFS4ERR_MOVED)
2221 goto restart; /* wasn't this one */
2222 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2223 goto restart; /* there are more */
2224 goto out;
2225 }
2226 rcu_read_unlock();
2227
2228out:
2229 put_cred(cred);
2230 return 0;
2231}
2232
2233/**
2234 * nfs4_discover_server_trunking - Detect server IP address trunking
2235 *
2236 * @clp: nfs_client under test
2237 * @result: OUT: found nfs_client, or clp
2238 *
2239 * Returns zero or a negative errno. If zero is returned,
2240 * an nfs_client pointer is planted in "result".
2241 *
2242 * Note: since we are invoked in process context, and
2243 * not from inside the state manager, we cannot use
2244 * nfs4_handle_reclaim_lease_error().
2245 */
2246int nfs4_discover_server_trunking(struct nfs_client *clp,
2247 struct nfs_client **result)
2248{
2249 const struct nfs4_state_recovery_ops *ops =
2250 clp->cl_mvops->reboot_recovery_ops;
2251 struct rpc_clnt *clnt;
2252 const struct cred *cred;
2253 int i, status;
2254
2255 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2256
2257 clnt = clp->cl_rpcclient;
2258 i = 0;
2259
2260 mutex_lock(&nfs_clid_init_mutex);
2261again:
2262 status = -ENOENT;
2263 cred = nfs4_get_clid_cred(clp);
2264 if (cred == NULL)
2265 goto out_unlock;
2266
2267 status = ops->detect_trunking(clp, result, cred);
2268 put_cred(cred);
2269 switch (status) {
2270 case 0:
2271 case -EINTR:
2272 case -ERESTARTSYS:
2273 break;
2274 case -ETIMEDOUT:
2275 if (clnt->cl_softrtry)
2276 break;
2277 fallthrough;
2278 case -NFS4ERR_DELAY:
2279 case -EAGAIN:
2280 ssleep(1);
2281 fallthrough;
2282 case -NFS4ERR_STALE_CLIENTID:
2283 dprintk("NFS: %s after status %d, retrying\n",
2284 __func__, status);
2285 goto again;
2286 case -EACCES:
2287 if (i++ == 0) {
2288 nfs4_root_machine_cred(clp);
2289 goto again;
2290 }
2291 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2292 break;
2293 fallthrough;
2294 case -NFS4ERR_CLID_INUSE:
2295 case -NFS4ERR_WRONGSEC:
2296 /* No point in retrying if we already used RPC_AUTH_UNIX */
2297 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2298 status = -EPERM;
2299 break;
2300 }
2301 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2302 if (IS_ERR(clnt)) {
2303 status = PTR_ERR(clnt);
2304 break;
2305 }
2306 /* Note: this is safe because we haven't yet marked the
2307 * client as ready, so we are the only user of
2308 * clp->cl_rpcclient
2309 */
2310 clnt = xchg(&clp->cl_rpcclient, clnt);
2311 rpc_shutdown_client(clnt);
2312 clnt = clp->cl_rpcclient;
2313 goto again;
2314
2315 case -NFS4ERR_MINOR_VERS_MISMATCH:
2316 status = -EPROTONOSUPPORT;
2317 break;
2318
2319 case -EKEYEXPIRED:
2320 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2321 * in nfs4_exchange_id */
2322 status = -EKEYEXPIRED;
2323 break;
2324 default:
2325 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2326 __func__, status);
2327 status = -EIO;
2328 }
2329
2330out_unlock:
2331 mutex_unlock(&nfs_clid_init_mutex);
2332 dprintk("NFS: %s: status = %d\n", __func__, status);
2333 return status;
2334}
2335
2336#ifdef CONFIG_NFS_V4_1
2337void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2338{
2339 struct nfs_client *clp = session->clp;
2340
2341 switch (err) {
2342 default:
2343 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2344 break;
2345 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2346 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2347 }
2348 nfs4_schedule_state_manager(clp);
2349}
2350EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2351
2352void nfs41_notify_server(struct nfs_client *clp)
2353{
2354 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2355 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2356 nfs4_schedule_state_manager(clp);
2357}
2358
2359static void nfs4_reset_all_state(struct nfs_client *clp)
2360{
2361 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2362 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2363 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2364 nfs4_state_start_reclaim_nograce(clp);
2365 dprintk("%s: scheduling reset of all state for server %s!\n",
2366 __func__, clp->cl_hostname);
2367 nfs4_schedule_state_manager(clp);
2368 }
2369}
2370
2371static void nfs41_handle_server_reboot(struct nfs_client *clp)
2372{
2373 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2374 nfs4_state_start_reclaim_reboot(clp);
2375 dprintk("%s: server %s rebooted!\n", __func__,
2376 clp->cl_hostname);
2377 nfs4_schedule_state_manager(clp);
2378 }
2379}
2380
2381static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2382{
2383 nfs4_reset_all_state(clp);
2384 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2385}
2386
2387static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2388{
2389 nfs4_state_start_reclaim_nograce(clp);
2390 nfs4_schedule_state_manager(clp);
2391
2392 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2393}
2394
2395static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2396{
2397 /* FIXME: For now, we destroy all layouts. */
2398 pnfs_destroy_all_layouts(clp);
2399 nfs_test_expired_all_delegations(clp);
2400 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2401 clp->cl_hostname);
2402}
2403
2404static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2405{
2406 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2407 nfs4_schedule_state_manager(clp);
2408
2409 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2410 clp->cl_hostname);
2411}
2412
2413static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2414{
2415 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2416 &clp->cl_state) == 0)
2417 nfs4_schedule_state_manager(clp);
2418}
2419
2420void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2421 bool recovery)
2422{
2423 if (!flags)
2424 return;
2425
2426 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2427 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2428 /*
2429 * If we're called from the state manager thread, then assume we're
2430 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2431 * Those flags are expected to remain set until we're done
2432 * recovering (see RFC5661, section 18.46.3).
2433 */
2434 if (recovery)
2435 goto out_recovery;
2436
2437 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2438 nfs41_handle_server_reboot(clp);
2439 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2440 nfs41_handle_all_state_revoked(clp);
2441 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2442 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2443 nfs41_handle_some_state_revoked(clp);
2444 if (flags & SEQ4_STATUS_LEASE_MOVED)
2445 nfs4_schedule_lease_moved_recovery(clp);
2446 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2447 nfs41_handle_recallable_state_revoked(clp);
2448out_recovery:
2449 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2450 nfs41_handle_backchannel_fault(clp);
2451 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2452 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2453 nfs41_handle_cb_path_down(clp);
2454}
2455
2456static int nfs4_reset_session(struct nfs_client *clp)
2457{
2458 const struct cred *cred;
2459 int status;
2460
2461 if (!nfs4_has_session(clp))
2462 return 0;
2463 status = nfs4_begin_drain_session(clp);
2464 if (status != 0)
2465 return status;
2466 cred = nfs4_get_clid_cred(clp);
2467 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2468 switch (status) {
2469 case 0:
2470 case -NFS4ERR_BADSESSION:
2471 case -NFS4ERR_DEADSESSION:
2472 break;
2473 case -NFS4ERR_BACK_CHAN_BUSY:
2474 case -NFS4ERR_DELAY:
2475 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2476 status = 0;
2477 ssleep(1);
2478 goto out;
2479 default:
2480 status = nfs4_recovery_handle_error(clp, status);
2481 goto out;
2482 }
2483
2484 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2485 status = nfs4_proc_create_session(clp, cred);
2486 if (status) {
2487 dprintk("%s: session reset failed with status %d for server %s!\n",
2488 __func__, status, clp->cl_hostname);
2489 status = nfs4_handle_reclaim_lease_error(clp, status);
2490 goto out;
2491 }
2492 nfs41_finish_session_reset(clp);
2493 dprintk("%s: session reset was successful for server %s!\n",
2494 __func__, clp->cl_hostname);
2495out:
2496 put_cred(cred);
2497 return status;
2498}
2499
2500static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2501{
2502 const struct cred *cred;
2503 int ret;
2504
2505 if (!nfs4_has_session(clp))
2506 return 0;
2507 ret = nfs4_begin_drain_session(clp);
2508 if (ret != 0)
2509 return ret;
2510 cred = nfs4_get_clid_cred(clp);
2511 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2512 put_cred(cred);
2513 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2514 switch (ret) {
2515 case 0:
2516 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2517 __func__, clp->cl_hostname);
2518 break;
2519 case -NFS4ERR_DELAY:
2520 ssleep(1);
2521 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2522 break;
2523 default:
2524 return nfs4_recovery_handle_error(clp, ret);
2525 }
2526 return 0;
2527}
2528
2529static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2530{
2531 int iomode = 0;
2532
2533 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2534 iomode += IOMODE_READ;
2535 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2536 iomode += IOMODE_RW;
2537 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2538 if (iomode) {
2539 pnfs_layout_return_unused_byclid(clp, iomode);
2540 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2541 }
2542}
2543#else /* CONFIG_NFS_V4_1 */
2544static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2545
2546static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2547{
2548 return 0;
2549}
2550
2551static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2552{
2553}
2554#endif /* CONFIG_NFS_V4_1 */
2555
2556static void nfs4_state_manager(struct nfs_client *clp)
2557{
2558 int status = 0;
2559 const char *section = "", *section_sep = "";
2560
2561 /* Ensure exclusive access to NFSv4 state */
2562 do {
2563 trace_nfs4_state_mgr(clp);
2564 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2565 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2566 section = "purge state";
2567 status = nfs4_purge_lease(clp);
2568 if (status < 0)
2569 goto out_error;
2570 continue;
2571 }
2572
2573 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2574 section = "lease expired";
2575 /* We're going to have to re-establish a clientid */
2576 status = nfs4_reclaim_lease(clp);
2577 if (status < 0)
2578 goto out_error;
2579 continue;
2580 }
2581
2582 /* Initialize or reset the session */
2583 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2584 section = "reset session";
2585 status = nfs4_reset_session(clp);
2586 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2587 continue;
2588 if (status < 0)
2589 goto out_error;
2590 }
2591
2592 /* Send BIND_CONN_TO_SESSION */
2593 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2594 &clp->cl_state)) {
2595 section = "bind conn to session";
2596 status = nfs4_bind_conn_to_session(clp);
2597 if (status < 0)
2598 goto out_error;
2599 continue;
2600 }
2601
2602 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2603 section = "check lease";
2604 status = nfs4_check_lease(clp);
2605 if (status < 0)
2606 goto out_error;
2607 continue;
2608 }
2609
2610 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2611 section = "migration";
2612 status = nfs4_handle_migration(clp);
2613 if (status < 0)
2614 goto out_error;
2615 }
2616
2617 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2618 section = "lease moved";
2619 status = nfs4_handle_lease_moved(clp);
2620 if (status < 0)
2621 goto out_error;
2622 }
2623
2624 /* First recover reboot state... */
2625 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2626 section = "reclaim reboot";
2627 status = nfs4_do_reclaim(clp,
2628 clp->cl_mvops->reboot_recovery_ops);
2629 if (status == -EAGAIN)
2630 continue;
2631 if (status < 0)
2632 goto out_error;
2633 nfs4_state_end_reclaim_reboot(clp);
2634 }
2635
2636 /* Detect expired delegations... */
2637 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2638 section = "detect expired delegations";
2639 nfs_reap_expired_delegations(clp);
2640 continue;
2641 }
2642
2643 /* Now recover expired state... */
2644 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2645 section = "reclaim nograce";
2646 status = nfs4_do_reclaim(clp,
2647 clp->cl_mvops->nograce_recovery_ops);
2648 if (status == -EAGAIN)
2649 continue;
2650 if (status < 0)
2651 goto out_error;
2652 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2653 }
2654
2655 nfs4_end_drain_session(clp);
2656 nfs4_clear_state_manager_bit(clp);
2657
2658 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
2659 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2660 nfs_client_return_marked_delegations(clp);
2661 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2662 }
2663 nfs4_layoutreturn_any_run(clp);
2664 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
2665 }
2666
2667 /* Did we race with an attempt to give us more work? */
2668 if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
2669 return;
2670 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2671 return;
2672 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2673 goto out_drain;
2674
2675out_error:
2676 if (strlen(section))
2677 section_sep = ": ";
2678 trace_nfs4_state_mgr_failed(clp, section, status);
2679 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2680 " with error %d\n", section_sep, section,
2681 clp->cl_hostname, -status);
2682 ssleep(1);
2683out_drain:
2684 nfs4_end_drain_session(clp);
2685 nfs4_clear_state_manager_bit(clp);
2686}
2687
2688static int nfs4_run_state_manager(void *ptr)
2689{
2690 struct nfs_client *clp = ptr;
2691
2692 allow_signal(SIGKILL);
2693 nfs4_state_manager(clp);
2694 nfs_put_client(clp);
2695 module_put_and_exit(0);
2696 return 0;
2697}
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#include <linux/sched/mm.h>
53
54#include <linux/sunrpc/clnt.h>
55
56#include "nfs4_fs.h"
57#include "callback.h"
58#include "delegation.h"
59#include "internal.h"
60#include "nfs4idmap.h"
61#include "nfs4session.h"
62#include "pnfs.h"
63#include "netns.h"
64#include "nfs4trace.h"
65
66#define NFSDBG_FACILITY NFSDBG_STATE
67
68#define OPENOWNER_POOL_SIZE 8
69
70static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp);
71
72const nfs4_stateid zero_stateid = {
73 { .data = { 0 } },
74 .type = NFS4_SPECIAL_STATEID_TYPE,
75};
76const nfs4_stateid invalid_stateid = {
77 {
78 /* Funky initialiser keeps older gcc versions happy */
79 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
80 },
81 .type = NFS4_INVALID_STATEID_TYPE,
82};
83
84const nfs4_stateid current_stateid = {
85 {
86 /* Funky initialiser keeps older gcc versions happy */
87 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
88 },
89 .type = NFS4_SPECIAL_STATEID_TYPE,
90};
91
92static DEFINE_MUTEX(nfs_clid_init_mutex);
93
94static int nfs4_setup_state_renewal(struct nfs_client *clp)
95{
96 int status;
97 struct nfs_fsinfo fsinfo;
98
99 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
100 nfs4_schedule_state_renewal(clp);
101 return 0;
102 }
103
104 status = nfs4_proc_get_lease_time(clp, &fsinfo);
105 if (status == 0) {
106 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
107 nfs4_schedule_state_renewal(clp);
108 }
109
110 return status;
111}
112
113int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
114{
115 struct nfs4_setclientid_res clid = {
116 .clientid = clp->cl_clientid,
117 .confirm = clp->cl_confirm,
118 };
119 unsigned short port;
120 int status;
121 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
122
123 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
124 goto do_confirm;
125 port = nn->nfs_callback_tcpport;
126 if (clp->cl_addr.ss_family == AF_INET6)
127 port = nn->nfs_callback_tcpport6;
128
129 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
130 if (status != 0)
131 goto out;
132 clp->cl_clientid = clid.clientid;
133 clp->cl_confirm = clid.confirm;
134 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
135do_confirm:
136 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
137 if (status != 0)
138 goto out;
139 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
140 nfs4_setup_state_renewal(clp);
141out:
142 return status;
143}
144
145/**
146 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
147 *
148 * @clp: nfs_client under test
149 * @result: OUT: found nfs_client, or clp
150 * @cred: credential to use for trunking test
151 *
152 * Returns zero, a negative errno, or a negative NFS4ERR status.
153 * If zero is returned, an nfs_client pointer is planted in
154 * "result".
155 *
156 * Note: The returned client may not yet be marked ready.
157 */
158int nfs40_discover_server_trunking(struct nfs_client *clp,
159 struct nfs_client **result,
160 const struct cred *cred)
161{
162 struct nfs4_setclientid_res clid = {
163 .clientid = clp->cl_clientid,
164 .confirm = clp->cl_confirm,
165 };
166 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
167 unsigned short port;
168 int status;
169
170 port = nn->nfs_callback_tcpport;
171 if (clp->cl_addr.ss_family == AF_INET6)
172 port = nn->nfs_callback_tcpport6;
173
174 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
175 if (status != 0)
176 goto out;
177 clp->cl_clientid = clid.clientid;
178 clp->cl_confirm = clid.confirm;
179
180 status = nfs40_walk_client_list(clp, result, cred);
181 if (status == 0) {
182 /* Sustain the lease, even if it's empty. If the clientid4
183 * goes stale it's of no use for trunking discovery. */
184 nfs4_schedule_state_renewal(*result);
185
186 /* If the client state need to recover, do it. */
187 if (clp->cl_state)
188 nfs4_schedule_state_manager(clp);
189 }
190out:
191 return status;
192}
193
194const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
195{
196 return get_cred(rpc_machine_cred());
197}
198
199static void nfs4_root_machine_cred(struct nfs_client *clp)
200{
201
202 /* Force root creds instead of machine */
203 clp->cl_principal = NULL;
204 clp->cl_rpcclient->cl_principal = NULL;
205}
206
207static const struct cred *
208nfs4_get_renew_cred_server_locked(struct nfs_server *server)
209{
210 const struct cred *cred = NULL;
211 struct nfs4_state_owner *sp;
212 struct rb_node *pos;
213
214 for (pos = rb_first(&server->state_owners);
215 pos != NULL;
216 pos = rb_next(pos)) {
217 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
218 if (list_empty(&sp->so_states))
219 continue;
220 cred = get_cred(sp->so_cred);
221 break;
222 }
223 return cred;
224}
225
226/**
227 * nfs4_get_renew_cred - Acquire credential for a renew operation
228 * @clp: client state handle
229 *
230 * Returns an rpc_cred with reference count bumped, or NULL.
231 * Caller must hold clp->cl_lock.
232 */
233const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
234{
235 const struct cred *cred = NULL;
236 struct nfs_server *server;
237
238 /* Use machine credentials if available */
239 cred = nfs4_get_machine_cred(clp);
240 if (cred != NULL)
241 goto out;
242
243 spin_lock(&clp->cl_lock);
244 rcu_read_lock();
245 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
246 cred = nfs4_get_renew_cred_server_locked(server);
247 if (cred != NULL)
248 break;
249 }
250 rcu_read_unlock();
251 spin_unlock(&clp->cl_lock);
252
253out:
254 return cred;
255}
256
257static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
258{
259 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
260 spin_lock(&tbl->slot_tbl_lock);
261 nfs41_wake_slot_table(tbl);
262 spin_unlock(&tbl->slot_tbl_lock);
263 }
264}
265
266static void nfs4_end_drain_session(struct nfs_client *clp)
267{
268 struct nfs4_session *ses = clp->cl_session;
269
270 if (clp->cl_slot_tbl) {
271 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
272 return;
273 }
274
275 if (ses != NULL) {
276 nfs4_end_drain_slot_table(&ses->bc_slot_table);
277 nfs4_end_drain_slot_table(&ses->fc_slot_table);
278 }
279}
280
281static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
282{
283 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
284 spin_lock(&tbl->slot_tbl_lock);
285 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
286 reinit_completion(&tbl->complete);
287 spin_unlock(&tbl->slot_tbl_lock);
288 return wait_for_completion_interruptible(&tbl->complete);
289 }
290 spin_unlock(&tbl->slot_tbl_lock);
291 return 0;
292}
293
294static int nfs4_begin_drain_session(struct nfs_client *clp)
295{
296 struct nfs4_session *ses = clp->cl_session;
297 int ret;
298
299 if (clp->cl_slot_tbl)
300 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
301
302 /* back channel */
303 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
304 if (ret)
305 return ret;
306 /* fore channel */
307 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
308}
309
310#if defined(CONFIG_NFS_V4_1)
311
312static void nfs41_finish_session_reset(struct nfs_client *clp)
313{
314 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
315 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
316 /* create_session negotiated new slot table */
317 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
318 nfs4_setup_state_renewal(clp);
319}
320
321int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
322{
323 int status;
324
325 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
326 goto do_confirm;
327 status = nfs4_proc_exchange_id(clp, cred);
328 if (status != 0)
329 goto out;
330 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
331do_confirm:
332 status = nfs4_proc_create_session(clp, cred);
333 if (status != 0)
334 goto out;
335 if (!(clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R))
336 nfs4_state_start_reclaim_reboot(clp);
337 nfs41_finish_session_reset(clp);
338 nfs_mark_client_ready(clp, NFS_CS_READY);
339out:
340 return status;
341}
342
343/**
344 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
345 *
346 * @clp: nfs_client under test
347 * @result: OUT: found nfs_client, or clp
348 * @cred: credential to use for trunking test
349 *
350 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
351 * If NFS4_OK is returned, an nfs_client pointer is planted in
352 * "result".
353 *
354 * Note: The returned client may not yet be marked ready.
355 */
356int nfs41_discover_server_trunking(struct nfs_client *clp,
357 struct nfs_client **result,
358 const struct cred *cred)
359{
360 int status;
361
362 status = nfs4_proc_exchange_id(clp, cred);
363 if (status != NFS4_OK)
364 return status;
365
366 status = nfs41_walk_client_list(clp, result, cred);
367 if (status < 0)
368 return status;
369 if (clp != *result)
370 return 0;
371
372 /*
373 * Purge state if the client id was established in a prior
374 * instance and the client id could not have arrived on the
375 * server via Transparent State Migration.
376 */
377 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
378 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
379 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
380 else
381 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
382 }
383 nfs4_schedule_state_manager(clp);
384 status = nfs_wait_client_init_complete(clp);
385 if (status < 0)
386 nfs_put_client(clp);
387 return status;
388}
389
390#endif /* CONFIG_NFS_V4_1 */
391
392/**
393 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
394 * @clp: client state handle
395 *
396 * Returns a cred with reference count bumped, or NULL.
397 */
398const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
399{
400 const struct cred *cred;
401
402 cred = nfs4_get_machine_cred(clp);
403 return cred;
404}
405
406static struct nfs4_state_owner *
407nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
408{
409 struct rb_node **p = &server->state_owners.rb_node,
410 *parent = NULL;
411 struct nfs4_state_owner *sp;
412 int cmp;
413
414 while (*p != NULL) {
415 parent = *p;
416 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
417 cmp = cred_fscmp(cred, sp->so_cred);
418
419 if (cmp < 0)
420 p = &parent->rb_left;
421 else if (cmp > 0)
422 p = &parent->rb_right;
423 else {
424 if (!list_empty(&sp->so_lru))
425 list_del_init(&sp->so_lru);
426 atomic_inc(&sp->so_count);
427 return sp;
428 }
429 }
430 return NULL;
431}
432
433static struct nfs4_state_owner *
434nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
435{
436 struct nfs_server *server = new->so_server;
437 struct rb_node **p = &server->state_owners.rb_node,
438 *parent = NULL;
439 struct nfs4_state_owner *sp;
440 int cmp;
441
442 while (*p != NULL) {
443 parent = *p;
444 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
445 cmp = cred_fscmp(new->so_cred, sp->so_cred);
446
447 if (cmp < 0)
448 p = &parent->rb_left;
449 else if (cmp > 0)
450 p = &parent->rb_right;
451 else {
452 if (!list_empty(&sp->so_lru))
453 list_del_init(&sp->so_lru);
454 atomic_inc(&sp->so_count);
455 return sp;
456 }
457 }
458 rb_link_node(&new->so_server_node, parent, p);
459 rb_insert_color(&new->so_server_node, &server->state_owners);
460 return new;
461}
462
463static void
464nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
465{
466 struct nfs_server *server = sp->so_server;
467
468 if (!RB_EMPTY_NODE(&sp->so_server_node))
469 rb_erase(&sp->so_server_node, &server->state_owners);
470}
471
472static void
473nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
474{
475 sc->create_time = ktime_get();
476 sc->flags = 0;
477 sc->counter = 0;
478 spin_lock_init(&sc->lock);
479 INIT_LIST_HEAD(&sc->list);
480 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
481}
482
483static void
484nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
485{
486 rpc_destroy_wait_queue(&sc->wait);
487}
488
489/*
490 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
491 * create a new state_owner.
492 *
493 */
494static struct nfs4_state_owner *
495nfs4_alloc_state_owner(struct nfs_server *server,
496 const struct cred *cred,
497 gfp_t gfp_flags)
498{
499 struct nfs4_state_owner *sp;
500
501 sp = kzalloc(sizeof(*sp), gfp_flags);
502 if (!sp)
503 return NULL;
504 sp->so_seqid.owner_id = ida_alloc(&server->openowner_id, gfp_flags);
505 if (sp->so_seqid.owner_id < 0) {
506 kfree(sp);
507 return NULL;
508 }
509 sp->so_server = server;
510 sp->so_cred = get_cred(cred);
511 spin_lock_init(&sp->so_lock);
512 INIT_LIST_HEAD(&sp->so_states);
513 nfs4_init_seqid_counter(&sp->so_seqid);
514 atomic_set(&sp->so_count, 1);
515 INIT_LIST_HEAD(&sp->so_lru);
516 seqcount_spinlock_init(&sp->so_reclaim_seqcount, &sp->so_lock);
517 mutex_init(&sp->so_delegreturn_mutex);
518 return sp;
519}
520
521static void
522nfs4_reset_state_owner(struct nfs4_state_owner *sp)
523{
524 /* This state_owner is no longer usable, but must
525 * remain in place so that state recovery can find it
526 * and the opens associated with it.
527 * It may also be used for new 'open' request to
528 * return a delegation to the server.
529 * So update the 'create_time' so that it looks like
530 * a new state_owner. This will cause the server to
531 * request an OPEN_CONFIRM to start a new sequence.
532 */
533 sp->so_seqid.create_time = ktime_get();
534}
535
536static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
537{
538 nfs4_destroy_seqid_counter(&sp->so_seqid);
539 put_cred(sp->so_cred);
540 ida_free(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
541 kfree(sp);
542}
543
544static void nfs4_gc_state_owners(struct nfs_server *server)
545{
546 struct nfs_client *clp = server->nfs_client;
547 struct nfs4_state_owner *sp, *tmp;
548 unsigned long time_min, time_max;
549 LIST_HEAD(doomed);
550
551 spin_lock(&clp->cl_lock);
552 time_max = jiffies;
553 time_min = (long)time_max - (long)clp->cl_lease_time;
554 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
555 /* NB: LRU is sorted so that oldest is at the head */
556 if (time_in_range(sp->so_expires, time_min, time_max))
557 break;
558 list_move(&sp->so_lru, &doomed);
559 nfs4_remove_state_owner_locked(sp);
560 }
561 spin_unlock(&clp->cl_lock);
562
563 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
564 list_del(&sp->so_lru);
565 nfs4_free_state_owner(sp);
566 }
567}
568
569/**
570 * nfs4_get_state_owner - Look up a state owner given a credential
571 * @server: nfs_server to search
572 * @cred: RPC credential to match
573 * @gfp_flags: allocation mode
574 *
575 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
576 */
577struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
578 const struct cred *cred,
579 gfp_t gfp_flags)
580{
581 struct nfs_client *clp = server->nfs_client;
582 struct nfs4_state_owner *sp, *new;
583
584 spin_lock(&clp->cl_lock);
585 sp = nfs4_find_state_owner_locked(server, cred);
586 spin_unlock(&clp->cl_lock);
587 if (sp != NULL)
588 goto out;
589 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
590 if (new == NULL)
591 goto out;
592 spin_lock(&clp->cl_lock);
593 sp = nfs4_insert_state_owner_locked(new);
594 spin_unlock(&clp->cl_lock);
595 if (sp != new)
596 nfs4_free_state_owner(new);
597out:
598 nfs4_gc_state_owners(server);
599 return sp;
600}
601
602/**
603 * nfs4_put_state_owner - Release a nfs4_state_owner
604 * @sp: state owner data to release
605 *
606 * Note that we keep released state owners on an LRU
607 * list.
608 * This caches valid state owners so that they can be
609 * reused, to avoid the OPEN_CONFIRM on minor version 0.
610 * It also pins the uniquifier of dropped state owners for
611 * a while, to ensure that those state owner names are
612 * never reused.
613 */
614void nfs4_put_state_owner(struct nfs4_state_owner *sp)
615{
616 struct nfs_server *server = sp->so_server;
617 struct nfs_client *clp = server->nfs_client;
618
619 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
620 return;
621
622 sp->so_expires = jiffies;
623 list_add_tail(&sp->so_lru, &server->state_owners_lru);
624 spin_unlock(&clp->cl_lock);
625}
626
627/**
628 * nfs4_purge_state_owners - Release all cached state owners
629 * @server: nfs_server with cached state owners to release
630 * @head: resulting list of state owners
631 *
632 * Called at umount time. Remaining state owners will be on
633 * the LRU with ref count of zero.
634 * Note that the state owners are not freed, but are added
635 * to the list @head, which can later be used as an argument
636 * to nfs4_free_state_owners.
637 */
638void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
639{
640 struct nfs_client *clp = server->nfs_client;
641 struct nfs4_state_owner *sp, *tmp;
642
643 spin_lock(&clp->cl_lock);
644 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
645 list_move(&sp->so_lru, head);
646 nfs4_remove_state_owner_locked(sp);
647 }
648 spin_unlock(&clp->cl_lock);
649}
650
651/**
652 * nfs4_free_state_owners - Release all cached state owners
653 * @head: resulting list of state owners
654 *
655 * Frees a list of state owners that was generated by
656 * nfs4_purge_state_owners
657 */
658void nfs4_free_state_owners(struct list_head *head)
659{
660 struct nfs4_state_owner *sp, *tmp;
661
662 list_for_each_entry_safe(sp, tmp, head, so_lru) {
663 list_del(&sp->so_lru);
664 nfs4_free_state_owner(sp);
665 }
666}
667
668static struct nfs4_state *
669nfs4_alloc_open_state(void)
670{
671 struct nfs4_state *state;
672
673 state = kzalloc(sizeof(*state), GFP_KERNEL_ACCOUNT);
674 if (!state)
675 return NULL;
676 refcount_set(&state->count, 1);
677 INIT_LIST_HEAD(&state->lock_states);
678 spin_lock_init(&state->state_lock);
679 seqlock_init(&state->seqlock);
680 init_waitqueue_head(&state->waitq);
681 return state;
682}
683
684void
685nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
686{
687 if (state->state == fmode)
688 return;
689 /* NB! List reordering - see the reclaim code for why. */
690 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
691 if (fmode & FMODE_WRITE)
692 list_move(&state->open_states, &state->owner->so_states);
693 else
694 list_move_tail(&state->open_states, &state->owner->so_states);
695 }
696 state->state = fmode;
697}
698
699static struct nfs4_state *
700__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
701{
702 struct nfs_inode *nfsi = NFS_I(inode);
703 struct nfs4_state *state;
704
705 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
706 if (state->owner != owner)
707 continue;
708 if (!nfs4_valid_open_stateid(state))
709 continue;
710 if (refcount_inc_not_zero(&state->count))
711 return state;
712 }
713 return NULL;
714}
715
716static void
717nfs4_free_open_state(struct nfs4_state *state)
718{
719 kfree_rcu(state, rcu_head);
720}
721
722struct nfs4_state *
723nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
724{
725 struct nfs4_state *state, *new;
726 struct nfs_inode *nfsi = NFS_I(inode);
727
728 rcu_read_lock();
729 state = __nfs4_find_state_byowner(inode, owner);
730 rcu_read_unlock();
731 if (state)
732 goto out;
733 new = nfs4_alloc_open_state();
734 spin_lock(&owner->so_lock);
735 spin_lock(&inode->i_lock);
736 state = __nfs4_find_state_byowner(inode, owner);
737 if (state == NULL && new != NULL) {
738 state = new;
739 state->owner = owner;
740 atomic_inc(&owner->so_count);
741 ihold(inode);
742 state->inode = inode;
743 list_add_rcu(&state->inode_states, &nfsi->open_states);
744 spin_unlock(&inode->i_lock);
745 /* Note: The reclaim code dictates that we add stateless
746 * and read-only stateids to the end of the list */
747 list_add_tail(&state->open_states, &owner->so_states);
748 spin_unlock(&owner->so_lock);
749 } else {
750 spin_unlock(&inode->i_lock);
751 spin_unlock(&owner->so_lock);
752 if (new)
753 nfs4_free_open_state(new);
754 }
755out:
756 return state;
757}
758
759void nfs4_put_open_state(struct nfs4_state *state)
760{
761 struct inode *inode = state->inode;
762 struct nfs4_state_owner *owner = state->owner;
763
764 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
765 return;
766 spin_lock(&inode->i_lock);
767 list_del_rcu(&state->inode_states);
768 list_del(&state->open_states);
769 spin_unlock(&inode->i_lock);
770 spin_unlock(&owner->so_lock);
771 nfs4_inode_return_delegation_on_close(inode);
772 iput(inode);
773 nfs4_free_open_state(state);
774 nfs4_put_state_owner(owner);
775}
776
777/*
778 * Close the current file.
779 */
780static void __nfs4_close(struct nfs4_state *state,
781 fmode_t fmode, gfp_t gfp_mask, int wait)
782{
783 struct nfs4_state_owner *owner = state->owner;
784 int call_close = 0;
785 fmode_t newstate;
786
787 atomic_inc(&owner->so_count);
788 /* Protect against nfs4_find_state() */
789 spin_lock(&owner->so_lock);
790 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
791 case FMODE_READ:
792 state->n_rdonly--;
793 break;
794 case FMODE_WRITE:
795 state->n_wronly--;
796 break;
797 case FMODE_READ|FMODE_WRITE:
798 state->n_rdwr--;
799 }
800 newstate = FMODE_READ|FMODE_WRITE;
801 if (state->n_rdwr == 0) {
802 if (state->n_rdonly == 0) {
803 newstate &= ~FMODE_READ;
804 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
805 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
806 }
807 if (state->n_wronly == 0) {
808 newstate &= ~FMODE_WRITE;
809 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
810 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
811 }
812 if (newstate == 0)
813 clear_bit(NFS_DELEGATED_STATE, &state->flags);
814 }
815 nfs4_state_set_mode_locked(state, newstate);
816 spin_unlock(&owner->so_lock);
817
818 if (!call_close) {
819 nfs4_put_open_state(state);
820 nfs4_put_state_owner(owner);
821 } else
822 nfs4_do_close(state, gfp_mask, wait);
823}
824
825void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
826{
827 __nfs4_close(state, fmode, GFP_KERNEL, 0);
828}
829
830void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
831{
832 __nfs4_close(state, fmode, GFP_KERNEL, 1);
833}
834
835/*
836 * Search the state->lock_states for an existing lock_owner
837 * that is compatible with either of the given owners.
838 * If the second is non-zero, then the first refers to a Posix-lock
839 * owner (current->files) and the second refers to a flock/OFD
840 * owner (struct file*). In that case, prefer a match for the first
841 * owner.
842 * If both sorts of locks are held on the one file we cannot know
843 * which stateid was intended to be used, so a "correct" choice cannot
844 * be made. Failing that, a "consistent" choice is preferable. The
845 * consistent choice we make is to prefer the first owner, that of a
846 * Posix lock.
847 */
848static struct nfs4_lock_state *
849__nfs4_find_lock_state(struct nfs4_state *state,
850 fl_owner_t fl_owner, fl_owner_t fl_owner2)
851{
852 struct nfs4_lock_state *pos, *ret = NULL;
853 list_for_each_entry(pos, &state->lock_states, ls_locks) {
854 if (pos->ls_owner == fl_owner) {
855 ret = pos;
856 break;
857 }
858 if (pos->ls_owner == fl_owner2)
859 ret = pos;
860 }
861 if (ret)
862 refcount_inc(&ret->ls_count);
863 return ret;
864}
865
866/*
867 * Return a compatible lock_state. If no initialized lock_state structure
868 * exists, return an uninitialized one.
869 *
870 */
871static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
872{
873 struct nfs4_lock_state *lsp;
874 struct nfs_server *server = state->owner->so_server;
875
876 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL_ACCOUNT);
877 if (lsp == NULL)
878 return NULL;
879 nfs4_init_seqid_counter(&lsp->ls_seqid);
880 refcount_set(&lsp->ls_count, 1);
881 lsp->ls_state = state;
882 lsp->ls_owner = fl_owner;
883 lsp->ls_seqid.owner_id = ida_alloc(&server->lockowner_id, GFP_KERNEL_ACCOUNT);
884 if (lsp->ls_seqid.owner_id < 0)
885 goto out_free;
886 INIT_LIST_HEAD(&lsp->ls_locks);
887 return lsp;
888out_free:
889 kfree(lsp);
890 return NULL;
891}
892
893void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
894{
895 ida_free(&server->lockowner_id, lsp->ls_seqid.owner_id);
896 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
897 kfree(lsp);
898}
899
900/*
901 * Return a compatible lock_state. If no initialized lock_state structure
902 * exists, return an uninitialized one.
903 *
904 */
905static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
906{
907 struct nfs4_lock_state *lsp, *new = NULL;
908
909 for(;;) {
910 spin_lock(&state->state_lock);
911 lsp = __nfs4_find_lock_state(state, owner, NULL);
912 if (lsp != NULL)
913 break;
914 if (new != NULL) {
915 list_add(&new->ls_locks, &state->lock_states);
916 set_bit(LK_STATE_IN_USE, &state->flags);
917 lsp = new;
918 new = NULL;
919 break;
920 }
921 spin_unlock(&state->state_lock);
922 new = nfs4_alloc_lock_state(state, owner);
923 if (new == NULL)
924 return NULL;
925 }
926 spin_unlock(&state->state_lock);
927 if (new != NULL)
928 nfs4_free_lock_state(state->owner->so_server, new);
929 return lsp;
930}
931
932/*
933 * Release reference to lock_state, and free it if we see that
934 * it is no longer in use
935 */
936void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
937{
938 struct nfs_server *server;
939 struct nfs4_state *state;
940
941 if (lsp == NULL)
942 return;
943 state = lsp->ls_state;
944 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
945 return;
946 list_del(&lsp->ls_locks);
947 if (list_empty(&state->lock_states))
948 clear_bit(LK_STATE_IN_USE, &state->flags);
949 spin_unlock(&state->state_lock);
950 server = state->owner->so_server;
951 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
952 struct nfs_client *clp = server->nfs_client;
953
954 clp->cl_mvops->free_lock_state(server, lsp);
955 } else
956 nfs4_free_lock_state(server, lsp);
957}
958
959static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
960{
961 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
962
963 dst->fl_u.nfs4_fl.owner = lsp;
964 refcount_inc(&lsp->ls_count);
965}
966
967static void nfs4_fl_release_lock(struct file_lock *fl)
968{
969 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
970}
971
972static const struct file_lock_operations nfs4_fl_lock_ops = {
973 .fl_copy_lock = nfs4_fl_copy_lock,
974 .fl_release_private = nfs4_fl_release_lock,
975};
976
977int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
978{
979 struct nfs4_lock_state *lsp;
980
981 if (fl->fl_ops != NULL)
982 return 0;
983 lsp = nfs4_get_lock_state(state, fl->fl_owner);
984 if (lsp == NULL)
985 return -ENOMEM;
986 fl->fl_u.nfs4_fl.owner = lsp;
987 fl->fl_ops = &nfs4_fl_lock_ops;
988 return 0;
989}
990
991static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
992 struct nfs4_state *state,
993 const struct nfs_lock_context *l_ctx)
994{
995 struct nfs4_lock_state *lsp;
996 fl_owner_t fl_owner, fl_flock_owner;
997 int ret = -ENOENT;
998
999 if (l_ctx == NULL)
1000 goto out;
1001
1002 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1003 goto out;
1004
1005 fl_owner = l_ctx->lockowner;
1006 fl_flock_owner = l_ctx->open_context->flock_owner;
1007
1008 spin_lock(&state->state_lock);
1009 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
1010 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1011 ret = -EIO;
1012 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1013 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1014 ret = 0;
1015 }
1016 spin_unlock(&state->state_lock);
1017 nfs4_put_lock_state(lsp);
1018out:
1019 return ret;
1020}
1021
1022bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1023{
1024 bool ret;
1025 const nfs4_stateid *src;
1026 int seq;
1027
1028 do {
1029 ret = false;
1030 src = &zero_stateid;
1031 seq = read_seqbegin(&state->seqlock);
1032 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1033 src = &state->open_stateid;
1034 ret = true;
1035 }
1036 nfs4_stateid_copy(dst, src);
1037 } while (read_seqretry(&state->seqlock, seq));
1038 return ret;
1039}
1040
1041/*
1042 * Byte-range lock aware utility to initialize the stateid of read/write
1043 * requests.
1044 */
1045int nfs4_select_rw_stateid(struct nfs4_state *state,
1046 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1047 nfs4_stateid *dst, const struct cred **cred)
1048{
1049 int ret;
1050
1051 if (!nfs4_valid_open_stateid(state))
1052 return -EIO;
1053 if (cred != NULL)
1054 *cred = NULL;
1055 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1056 if (ret == -EIO)
1057 /* A lost lock - don't even consider delegations */
1058 goto out;
1059 /* returns true if delegation stateid found and copied */
1060 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1061 ret = 0;
1062 goto out;
1063 }
1064 if (ret != -ENOENT)
1065 /* nfs4_copy_delegation_stateid() didn't over-write
1066 * dst, so it still has the lock stateid which we now
1067 * choose to use.
1068 */
1069 goto out;
1070 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1071out:
1072 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1073 dst->seqid = 0;
1074 return ret;
1075}
1076
1077struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1078{
1079 struct nfs_seqid *new;
1080
1081 new = kmalloc(sizeof(*new), gfp_mask);
1082 if (new == NULL)
1083 return ERR_PTR(-ENOMEM);
1084 new->sequence = counter;
1085 INIT_LIST_HEAD(&new->list);
1086 new->task = NULL;
1087 return new;
1088}
1089
1090void nfs_release_seqid(struct nfs_seqid *seqid)
1091{
1092 struct nfs_seqid_counter *sequence;
1093
1094 if (seqid == NULL || list_empty(&seqid->list))
1095 return;
1096 sequence = seqid->sequence;
1097 spin_lock(&sequence->lock);
1098 list_del_init(&seqid->list);
1099 if (!list_empty(&sequence->list)) {
1100 struct nfs_seqid *next;
1101
1102 next = list_first_entry(&sequence->list,
1103 struct nfs_seqid, list);
1104 rpc_wake_up_queued_task(&sequence->wait, next->task);
1105 }
1106 spin_unlock(&sequence->lock);
1107}
1108
1109void nfs_free_seqid(struct nfs_seqid *seqid)
1110{
1111 nfs_release_seqid(seqid);
1112 kfree(seqid);
1113}
1114
1115/*
1116 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1117 * failed with a seqid incrementing error -
1118 * see comments nfs4.h:seqid_mutating_error()
1119 */
1120static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1121{
1122 switch (status) {
1123 case 0:
1124 break;
1125 case -NFS4ERR_BAD_SEQID:
1126 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1127 return;
1128 pr_warn_ratelimited("NFS: v4 server returned a bad"
1129 " sequence-id error on an"
1130 " unconfirmed sequence %p!\n",
1131 seqid->sequence);
1132 return;
1133 case -NFS4ERR_STALE_CLIENTID:
1134 case -NFS4ERR_STALE_STATEID:
1135 case -NFS4ERR_BAD_STATEID:
1136 case -NFS4ERR_BADXDR:
1137 case -NFS4ERR_RESOURCE:
1138 case -NFS4ERR_NOFILEHANDLE:
1139 case -NFS4ERR_MOVED:
1140 /* Non-seqid mutating errors */
1141 return;
1142 }
1143 /*
1144 * Note: no locking needed as we are guaranteed to be first
1145 * on the sequence list
1146 */
1147 seqid->sequence->counter++;
1148}
1149
1150void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1151{
1152 struct nfs4_state_owner *sp;
1153
1154 if (seqid == NULL)
1155 return;
1156
1157 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1158 if (status == -NFS4ERR_BAD_SEQID)
1159 nfs4_reset_state_owner(sp);
1160 if (!nfs4_has_session(sp->so_server->nfs_client))
1161 nfs_increment_seqid(status, seqid);
1162}
1163
1164/*
1165 * Increment the seqid if the LOCK/LOCKU succeeded, or
1166 * failed with a seqid incrementing error -
1167 * see comments nfs4.h:seqid_mutating_error()
1168 */
1169void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1170{
1171 if (seqid != NULL)
1172 nfs_increment_seqid(status, seqid);
1173}
1174
1175int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1176{
1177 struct nfs_seqid_counter *sequence;
1178 int status = 0;
1179
1180 if (seqid == NULL)
1181 goto out;
1182 sequence = seqid->sequence;
1183 spin_lock(&sequence->lock);
1184 seqid->task = task;
1185 if (list_empty(&seqid->list))
1186 list_add_tail(&seqid->list, &sequence->list);
1187 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1188 goto unlock;
1189 rpc_sleep_on(&sequence->wait, task, NULL);
1190 status = -EAGAIN;
1191unlock:
1192 spin_unlock(&sequence->lock);
1193out:
1194 return status;
1195}
1196
1197static int nfs4_run_state_manager(void *);
1198
1199static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1200{
1201 clear_and_wake_up_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1202 rpc_wake_up(&clp->cl_rpcwaitq);
1203}
1204
1205/*
1206 * Schedule the nfs_client asynchronous state management routine
1207 */
1208void nfs4_schedule_state_manager(struct nfs_client *clp)
1209{
1210 struct task_struct *task;
1211 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1212 struct rpc_clnt *clnt = clp->cl_rpcclient;
1213 bool swapon = false;
1214
1215 if (clnt->cl_shutdown)
1216 return;
1217
1218 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1219
1220 if (atomic_read(&clnt->cl_swapper)) {
1221 swapon = !test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE,
1222 &clp->cl_state);
1223 if (!swapon) {
1224 wake_up_var(&clp->cl_state);
1225 return;
1226 }
1227 }
1228
1229 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1230 return;
1231
1232 __module_get(THIS_MODULE);
1233 refcount_inc(&clp->cl_count);
1234
1235 /* The rcu_read_lock() is not strictly necessary, as the state
1236 * manager is the only thread that ever changes the rpc_xprt
1237 * after it's initialized. At this point, we're single threaded. */
1238 rcu_read_lock();
1239 snprintf(buf, sizeof(buf), "%s-manager",
1240 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1241 rcu_read_unlock();
1242 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1243 if (IS_ERR(task)) {
1244 printk(KERN_ERR "%s: kthread_run: %ld\n",
1245 __func__, PTR_ERR(task));
1246 if (!nfs_client_init_is_complete(clp))
1247 nfs_mark_client_ready(clp, PTR_ERR(task));
1248 if (swapon)
1249 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
1250 nfs4_clear_state_manager_bit(clp);
1251 nfs_put_client(clp);
1252 module_put(THIS_MODULE);
1253 }
1254}
1255
1256/*
1257 * Schedule a lease recovery attempt
1258 */
1259void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1260{
1261 if (!clp)
1262 return;
1263 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1264 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1265 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1266 clp->cl_hostname);
1267 nfs4_schedule_state_manager(clp);
1268}
1269EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1270
1271/**
1272 * nfs4_schedule_migration_recovery - trigger migration recovery
1273 *
1274 * @server: FSID that is migrating
1275 *
1276 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1277 * value is returned.
1278 */
1279int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1280{
1281 struct nfs_client *clp = server->nfs_client;
1282
1283 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1284 pr_err("NFS: volatile file handles not supported (server %s)\n",
1285 clp->cl_hostname);
1286 return -NFS4ERR_IO;
1287 }
1288
1289 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1290 return -NFS4ERR_IO;
1291
1292 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1293 __func__,
1294 (unsigned long long)server->fsid.major,
1295 (unsigned long long)server->fsid.minor,
1296 clp->cl_hostname);
1297
1298 set_bit(NFS_MIG_IN_TRANSITION,
1299 &((struct nfs_server *)server)->mig_status);
1300 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1301
1302 nfs4_schedule_state_manager(clp);
1303 return 0;
1304}
1305EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1306
1307/**
1308 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1309 *
1310 * @clp: server to check for moved leases
1311 *
1312 */
1313void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1314{
1315 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1316 __func__, clp->cl_clientid, clp->cl_hostname);
1317
1318 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1319 nfs4_schedule_state_manager(clp);
1320}
1321EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1322
1323int nfs4_wait_clnt_recover(struct nfs_client *clp)
1324{
1325 int res;
1326
1327 might_sleep();
1328
1329 refcount_inc(&clp->cl_count);
1330 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1331 nfs_wait_bit_killable,
1332 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1333 if (res)
1334 goto out;
1335 if (clp->cl_cons_state < 0)
1336 res = clp->cl_cons_state;
1337out:
1338 nfs_put_client(clp);
1339 return res;
1340}
1341
1342int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1343{
1344 unsigned int loop;
1345 int ret;
1346
1347 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1348 ret = nfs4_wait_clnt_recover(clp);
1349 if (ret != 0)
1350 break;
1351 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1352 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1353 break;
1354 nfs4_schedule_state_manager(clp);
1355 ret = -EIO;
1356 }
1357 return ret;
1358}
1359
1360/*
1361 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1362 * @clp: client to process
1363 *
1364 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1365 * resend of the SETCLIENTID and hence re-establish the
1366 * callback channel. Then return all existing delegations.
1367 */
1368static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1369{
1370 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1371 nfs_expire_all_delegations(clp);
1372 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1373 clp->cl_hostname);
1374}
1375
1376void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1377{
1378 nfs40_handle_cb_pathdown(clp);
1379 nfs4_schedule_state_manager(clp);
1380}
1381
1382static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1383{
1384
1385 if (!nfs4_valid_open_stateid(state))
1386 return 0;
1387 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1388 /* Don't recover state that expired before the reboot */
1389 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1390 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1391 return 0;
1392 }
1393 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1394 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1395 return 1;
1396}
1397
1398int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1399{
1400 if (!nfs4_valid_open_stateid(state))
1401 return 0;
1402 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1403 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1404 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1405 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1406 return 1;
1407}
1408
1409int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1410{
1411 struct nfs_client *clp = server->nfs_client;
1412
1413 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1414 return -EBADF;
1415 nfs_inode_find_delegation_state_and_recover(state->inode,
1416 &state->stateid);
1417 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1418 clp->cl_hostname);
1419 nfs4_schedule_state_manager(clp);
1420 return 0;
1421}
1422EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1423
1424static struct nfs4_lock_state *
1425nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1426 const nfs4_stateid *stateid)
1427{
1428 struct nfs4_lock_state *pos;
1429
1430 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1431 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1432 continue;
1433 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1434 return pos;
1435 }
1436 return NULL;
1437}
1438
1439static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1440 const nfs4_stateid *stateid)
1441{
1442 bool found = false;
1443
1444 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1445 spin_lock(&state->state_lock);
1446 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1447 found = true;
1448 spin_unlock(&state->state_lock);
1449 }
1450 return found;
1451}
1452
1453void nfs_inode_find_state_and_recover(struct inode *inode,
1454 const nfs4_stateid *stateid)
1455{
1456 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1457 struct nfs_inode *nfsi = NFS_I(inode);
1458 struct nfs_open_context *ctx;
1459 struct nfs4_state *state;
1460 bool found = false;
1461
1462 rcu_read_lock();
1463 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1464 state = ctx->state;
1465 if (state == NULL)
1466 continue;
1467 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1468 nfs4_state_mark_reclaim_nograce(clp, state)) {
1469 found = true;
1470 continue;
1471 }
1472 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1473 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
1474 nfs4_state_mark_reclaim_nograce(clp, state)) {
1475 found = true;
1476 continue;
1477 }
1478 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1479 nfs4_state_mark_reclaim_nograce(clp, state))
1480 found = true;
1481 }
1482 rcu_read_unlock();
1483
1484 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1485 if (found)
1486 nfs4_schedule_state_manager(clp);
1487}
1488
1489static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1490{
1491 struct inode *inode = state->inode;
1492 struct nfs_inode *nfsi = NFS_I(inode);
1493 struct nfs_open_context *ctx;
1494
1495 rcu_read_lock();
1496 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1497 if (ctx->state != state)
1498 continue;
1499 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1500 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1501 "error = %d\n", ctx->dentry, err);
1502 }
1503 rcu_read_unlock();
1504}
1505
1506static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1507{
1508 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1509 nfs4_state_mark_open_context_bad(state, error);
1510}
1511
1512
1513static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1514{
1515 struct inode *inode = state->inode;
1516 struct nfs_inode *nfsi = NFS_I(inode);
1517 struct file_lock *fl;
1518 struct nfs4_lock_state *lsp;
1519 int status = 0;
1520 struct file_lock_context *flctx = locks_inode_context(inode);
1521 struct list_head *list;
1522
1523 if (flctx == NULL)
1524 return 0;
1525
1526 list = &flctx->flc_posix;
1527
1528 /* Guard against delegation returns and new lock/unlock calls */
1529 down_write(&nfsi->rwsem);
1530 spin_lock(&flctx->flc_lock);
1531restart:
1532 list_for_each_entry(fl, list, fl_list) {
1533 if (nfs_file_open_context(fl->fl_file)->state != state)
1534 continue;
1535 spin_unlock(&flctx->flc_lock);
1536 status = ops->recover_lock(state, fl);
1537 switch (status) {
1538 case 0:
1539 break;
1540 case -ETIMEDOUT:
1541 case -ESTALE:
1542 case -NFS4ERR_ADMIN_REVOKED:
1543 case -NFS4ERR_STALE_STATEID:
1544 case -NFS4ERR_BAD_STATEID:
1545 case -NFS4ERR_EXPIRED:
1546 case -NFS4ERR_NO_GRACE:
1547 case -NFS4ERR_STALE_CLIENTID:
1548 case -NFS4ERR_BADSESSION:
1549 case -NFS4ERR_BADSLOT:
1550 case -NFS4ERR_BAD_HIGH_SLOT:
1551 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1552 goto out;
1553 default:
1554 pr_err("NFS: %s: unhandled error %d\n",
1555 __func__, status);
1556 fallthrough;
1557 case -ENOMEM:
1558 case -NFS4ERR_DENIED:
1559 case -NFS4ERR_RECLAIM_BAD:
1560 case -NFS4ERR_RECLAIM_CONFLICT:
1561 lsp = fl->fl_u.nfs4_fl.owner;
1562 if (lsp)
1563 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1564 status = 0;
1565 }
1566 spin_lock(&flctx->flc_lock);
1567 }
1568 if (list == &flctx->flc_posix) {
1569 list = &flctx->flc_flock;
1570 goto restart;
1571 }
1572 spin_unlock(&flctx->flc_lock);
1573out:
1574 up_write(&nfsi->rwsem);
1575 return status;
1576}
1577
1578#ifdef CONFIG_NFS_V4_2
1579static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1580{
1581 struct nfs4_copy_state *copy;
1582
1583 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1584 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1585 return;
1586
1587 spin_lock(&sp->so_server->nfs_client->cl_lock);
1588 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1589 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1590 !nfs4_stateid_match_other(&state->stateid,
1591 ©->parent_dst_state->stateid)))
1592 continue;
1593 copy->flags = 1;
1594 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1595 &state->flags)) {
1596 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1597 complete(©->completion);
1598 }
1599 }
1600 list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
1601 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1602 !nfs4_stateid_match_other(&state->stateid,
1603 ©->parent_src_state->stateid)))
1604 continue;
1605 copy->flags = 1;
1606 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1607 &state->flags))
1608 complete(©->completion);
1609 }
1610 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1611}
1612#else /* !CONFIG_NFS_V4_2 */
1613static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1614 struct nfs4_state *state)
1615{
1616}
1617#endif /* CONFIG_NFS_V4_2 */
1618
1619static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1620 const struct nfs4_state_recovery_ops *ops,
1621 int *lost_locks)
1622{
1623 struct nfs4_lock_state *lock;
1624 int status;
1625
1626 status = ops->recover_open(sp, state);
1627 if (status < 0)
1628 return status;
1629
1630 status = nfs4_reclaim_locks(state, ops);
1631 if (status < 0)
1632 return status;
1633
1634 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1635 spin_lock(&state->state_lock);
1636 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1637 trace_nfs4_state_lock_reclaim(state, lock);
1638 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags) &&
1639 !test_bit(NFS_LOCK_UNLOCKING, &lock->ls_flags))
1640 *lost_locks += 1;
1641 }
1642 spin_unlock(&state->state_lock);
1643 }
1644
1645 nfs42_complete_copies(sp, state);
1646 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1647 return status;
1648}
1649
1650static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp,
1651 const struct nfs4_state_recovery_ops *ops,
1652 int *lost_locks)
1653{
1654 struct nfs4_state *state;
1655 unsigned int loop = 0;
1656 int status = 0;
1657#ifdef CONFIG_NFS_V4_2
1658 bool found_ssc_copy_state = false;
1659#endif /* CONFIG_NFS_V4_2 */
1660
1661 /* Note: we rely on the sp->so_states list being ordered
1662 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1663 * states first.
1664 * This is needed to ensure that the server won't give us any
1665 * read delegations that we have to return if, say, we are
1666 * recovering after a network partition or a reboot from a
1667 * server that doesn't support a grace period.
1668 */
1669 spin_lock(&sp->so_lock);
1670 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1671restart:
1672 list_for_each_entry(state, &sp->so_states, open_states) {
1673 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1674 continue;
1675 if (!nfs4_valid_open_stateid(state))
1676 continue;
1677 if (state->state == 0)
1678 continue;
1679#ifdef CONFIG_NFS_V4_2
1680 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1681 nfs4_state_mark_recovery_failed(state, -EIO);
1682 found_ssc_copy_state = true;
1683 continue;
1684 }
1685#endif /* CONFIG_NFS_V4_2 */
1686 refcount_inc(&state->count);
1687 spin_unlock(&sp->so_lock);
1688 status = __nfs4_reclaim_open_state(sp, state, ops, lost_locks);
1689
1690 switch (status) {
1691 default:
1692 if (status >= 0) {
1693 loop = 0;
1694 break;
1695 }
1696 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1697 fallthrough;
1698 case -ENOENT:
1699 case -ENOMEM:
1700 case -EACCES:
1701 case -EROFS:
1702 case -EIO:
1703 case -ESTALE:
1704 /* Open state on this file cannot be recovered */
1705 nfs4_state_mark_recovery_failed(state, status);
1706 break;
1707 case -EAGAIN:
1708 ssleep(1);
1709 if (loop++ < 10) {
1710 set_bit(ops->state_flag_bit, &state->flags);
1711 break;
1712 }
1713 fallthrough;
1714 case -NFS4ERR_ADMIN_REVOKED:
1715 case -NFS4ERR_STALE_STATEID:
1716 case -NFS4ERR_OLD_STATEID:
1717 case -NFS4ERR_BAD_STATEID:
1718 case -NFS4ERR_RECLAIM_BAD:
1719 case -NFS4ERR_RECLAIM_CONFLICT:
1720 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1721 break;
1722 case -NFS4ERR_EXPIRED:
1723 case -NFS4ERR_NO_GRACE:
1724 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1725 fallthrough;
1726 case -NFS4ERR_STALE_CLIENTID:
1727 case -NFS4ERR_BADSESSION:
1728 case -NFS4ERR_BADSLOT:
1729 case -NFS4ERR_BAD_HIGH_SLOT:
1730 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1731 case -ETIMEDOUT:
1732 goto out_err;
1733 }
1734 nfs4_put_open_state(state);
1735 spin_lock(&sp->so_lock);
1736 goto restart;
1737 }
1738 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1739 spin_unlock(&sp->so_lock);
1740#ifdef CONFIG_NFS_V4_2
1741 if (found_ssc_copy_state)
1742 return -EIO;
1743#endif /* CONFIG_NFS_V4_2 */
1744 return 0;
1745out_err:
1746 nfs4_put_open_state(state);
1747 spin_lock(&sp->so_lock);
1748 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1749 spin_unlock(&sp->so_lock);
1750 return status;
1751}
1752
1753static void nfs4_clear_open_state(struct nfs4_state *state)
1754{
1755 struct nfs4_lock_state *lock;
1756
1757 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1758 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1759 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1760 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1761 spin_lock(&state->state_lock);
1762 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1763 lock->ls_seqid.flags = 0;
1764 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1765 }
1766 spin_unlock(&state->state_lock);
1767}
1768
1769static void nfs4_reset_seqids(struct nfs_server *server,
1770 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1771{
1772 struct nfs_client *clp = server->nfs_client;
1773 struct nfs4_state_owner *sp;
1774 struct rb_node *pos;
1775 struct nfs4_state *state;
1776
1777 spin_lock(&clp->cl_lock);
1778 for (pos = rb_first(&server->state_owners);
1779 pos != NULL;
1780 pos = rb_next(pos)) {
1781 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1782 sp->so_seqid.flags = 0;
1783 spin_lock(&sp->so_lock);
1784 list_for_each_entry(state, &sp->so_states, open_states) {
1785 if (mark_reclaim(clp, state))
1786 nfs4_clear_open_state(state);
1787 }
1788 spin_unlock(&sp->so_lock);
1789 }
1790 spin_unlock(&clp->cl_lock);
1791}
1792
1793static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1794 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1795{
1796 struct nfs_server *server;
1797
1798 rcu_read_lock();
1799 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1800 nfs4_reset_seqids(server, mark_reclaim);
1801 rcu_read_unlock();
1802}
1803
1804static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1805{
1806 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1807 /* Mark all delegations for reclaim */
1808 nfs_delegation_mark_reclaim(clp);
1809 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1810}
1811
1812static int nfs4_reclaim_complete(struct nfs_client *clp,
1813 const struct nfs4_state_recovery_ops *ops,
1814 const struct cred *cred)
1815{
1816 /* Notify the server we're done reclaiming our state */
1817 if (ops->reclaim_complete)
1818 return ops->reclaim_complete(clp, cred);
1819 return 0;
1820}
1821
1822static void nfs4_clear_reclaim_server(struct nfs_server *server)
1823{
1824 struct nfs_client *clp = server->nfs_client;
1825 struct nfs4_state_owner *sp;
1826 struct rb_node *pos;
1827 struct nfs4_state *state;
1828
1829 spin_lock(&clp->cl_lock);
1830 for (pos = rb_first(&server->state_owners);
1831 pos != NULL;
1832 pos = rb_next(pos)) {
1833 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1834 spin_lock(&sp->so_lock);
1835 list_for_each_entry(state, &sp->so_states, open_states) {
1836 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1837 &state->flags))
1838 continue;
1839 nfs4_state_mark_reclaim_nograce(clp, state);
1840 }
1841 spin_unlock(&sp->so_lock);
1842 }
1843 spin_unlock(&clp->cl_lock);
1844}
1845
1846static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1847{
1848 struct nfs_server *server;
1849
1850 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1851 return 0;
1852
1853 rcu_read_lock();
1854 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1855 nfs4_clear_reclaim_server(server);
1856 rcu_read_unlock();
1857
1858 nfs_delegation_reap_unclaimed(clp);
1859 return 1;
1860}
1861
1862static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1863{
1864 const struct nfs4_state_recovery_ops *ops;
1865 const struct cred *cred;
1866 int err;
1867
1868 if (!nfs4_state_clear_reclaim_reboot(clp))
1869 return;
1870 ops = clp->cl_mvops->reboot_recovery_ops;
1871 cred = nfs4_get_clid_cred(clp);
1872 err = nfs4_reclaim_complete(clp, ops, cred);
1873 put_cred(cred);
1874 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1875 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1876}
1877
1878static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1879{
1880 nfs_mark_test_expired_all_delegations(clp);
1881 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1882}
1883
1884static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1885{
1886 switch (error) {
1887 case 0:
1888 break;
1889 case -NFS4ERR_CB_PATH_DOWN:
1890 nfs40_handle_cb_pathdown(clp);
1891 break;
1892 case -NFS4ERR_NO_GRACE:
1893 nfs4_state_end_reclaim_reboot(clp);
1894 break;
1895 case -NFS4ERR_STALE_CLIENTID:
1896 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1897 nfs4_state_start_reclaim_reboot(clp);
1898 break;
1899 case -NFS4ERR_EXPIRED:
1900 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1901 nfs4_state_start_reclaim_nograce(clp);
1902 break;
1903 case -NFS4ERR_BADSESSION:
1904 case -NFS4ERR_BADSLOT:
1905 case -NFS4ERR_BAD_HIGH_SLOT:
1906 case -NFS4ERR_DEADSESSION:
1907 case -NFS4ERR_SEQ_FALSE_RETRY:
1908 case -NFS4ERR_SEQ_MISORDERED:
1909 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1910 /* Zero session reset errors */
1911 break;
1912 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1913 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1914 break;
1915 default:
1916 dprintk("%s: failed to handle error %d for server %s\n",
1917 __func__, error, clp->cl_hostname);
1918 return error;
1919 }
1920 dprintk("%s: handled error %d for server %s\n", __func__, error,
1921 clp->cl_hostname);
1922 return 0;
1923}
1924
1925static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1926{
1927 struct nfs4_state_owner *sp;
1928 struct nfs_server *server;
1929 struct rb_node *pos;
1930 LIST_HEAD(freeme);
1931 int status = 0;
1932 int lost_locks = 0;
1933
1934restart:
1935 rcu_read_lock();
1936 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1937 nfs4_purge_state_owners(server, &freeme);
1938 spin_lock(&clp->cl_lock);
1939 for (pos = rb_first(&server->state_owners);
1940 pos != NULL;
1941 pos = rb_next(pos)) {
1942 sp = rb_entry(pos,
1943 struct nfs4_state_owner, so_server_node);
1944 if (!test_and_clear_bit(ops->owner_flag_bit,
1945 &sp->so_flags))
1946 continue;
1947 if (!atomic_inc_not_zero(&sp->so_count))
1948 continue;
1949 spin_unlock(&clp->cl_lock);
1950 rcu_read_unlock();
1951
1952 status = nfs4_reclaim_open_state(sp, ops, &lost_locks);
1953 if (status < 0) {
1954 if (lost_locks)
1955 pr_warn("NFS: %s: lost %d locks\n",
1956 clp->cl_hostname, lost_locks);
1957 set_bit(ops->owner_flag_bit, &sp->so_flags);
1958 nfs4_put_state_owner(sp);
1959 status = nfs4_recovery_handle_error(clp, status);
1960 return (status != 0) ? status : -EAGAIN;
1961 }
1962
1963 nfs4_put_state_owner(sp);
1964 goto restart;
1965 }
1966 spin_unlock(&clp->cl_lock);
1967 }
1968 rcu_read_unlock();
1969 nfs4_free_state_owners(&freeme);
1970 if (lost_locks)
1971 pr_warn("NFS: %s: lost %d locks\n",
1972 clp->cl_hostname, lost_locks);
1973 return 0;
1974}
1975
1976static int nfs4_check_lease(struct nfs_client *clp)
1977{
1978 const struct cred *cred;
1979 const struct nfs4_state_maintenance_ops *ops =
1980 clp->cl_mvops->state_renewal_ops;
1981 int status;
1982
1983 /* Is the client already known to have an expired lease? */
1984 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1985 return 0;
1986 cred = ops->get_state_renewal_cred(clp);
1987 if (cred == NULL) {
1988 cred = nfs4_get_clid_cred(clp);
1989 status = -ENOKEY;
1990 if (cred == NULL)
1991 goto out;
1992 }
1993 status = ops->renew_lease(clp, cred);
1994 put_cred(cred);
1995 if (status == -ETIMEDOUT) {
1996 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1997 return 0;
1998 }
1999out:
2000 return nfs4_recovery_handle_error(clp, status);
2001}
2002
2003/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
2004 * and for recoverable errors on EXCHANGE_ID for v4.1
2005 */
2006static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
2007{
2008 switch (status) {
2009 case -NFS4ERR_SEQ_MISORDERED:
2010 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
2011 return -ESERVERFAULT;
2012 /* Lease confirmation error: retry after purging the lease */
2013 ssleep(1);
2014 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2015 break;
2016 case -NFS4ERR_STALE_CLIENTID:
2017 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2018 nfs4_state_start_reclaim_reboot(clp);
2019 break;
2020 case -NFS4ERR_CLID_INUSE:
2021 pr_err("NFS: Server %s reports our clientid is in use\n",
2022 clp->cl_hostname);
2023 nfs_mark_client_ready(clp, -EPERM);
2024 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2025 return -EPERM;
2026 case -EACCES:
2027 case -NFS4ERR_DELAY:
2028 case -EAGAIN:
2029 ssleep(1);
2030 break;
2031
2032 case -NFS4ERR_MINOR_VERS_MISMATCH:
2033 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2034 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
2035 dprintk("%s: exit with error %d for server %s\n",
2036 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2037 return -EPROTONOSUPPORT;
2038 case -ENOSPC:
2039 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2040 nfs_mark_client_ready(clp, -EIO);
2041 return -EIO;
2042 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2043 * in nfs4_exchange_id */
2044 default:
2045 dprintk("%s: exit with error %d for server %s\n", __func__,
2046 status, clp->cl_hostname);
2047 return status;
2048 }
2049 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2050 dprintk("%s: handled error %d for server %s\n", __func__, status,
2051 clp->cl_hostname);
2052 return 0;
2053}
2054
2055static int nfs4_establish_lease(struct nfs_client *clp)
2056{
2057 const struct cred *cred;
2058 const struct nfs4_state_recovery_ops *ops =
2059 clp->cl_mvops->reboot_recovery_ops;
2060 int status;
2061
2062 status = nfs4_begin_drain_session(clp);
2063 if (status != 0)
2064 return status;
2065 cred = nfs4_get_clid_cred(clp);
2066 if (cred == NULL)
2067 return -ENOENT;
2068 status = ops->establish_clid(clp, cred);
2069 put_cred(cred);
2070 if (status != 0)
2071 return status;
2072 pnfs_destroy_all_layouts(clp);
2073 return 0;
2074}
2075
2076/*
2077 * Returns zero or a negative errno. NFS4ERR values are converted
2078 * to local errno values.
2079 */
2080static int nfs4_reclaim_lease(struct nfs_client *clp)
2081{
2082 int status;
2083
2084 status = nfs4_establish_lease(clp);
2085 if (status < 0)
2086 return nfs4_handle_reclaim_lease_error(clp, status);
2087 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2088 nfs4_state_start_reclaim_nograce(clp);
2089 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2090 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2091 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2092 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2093 return 0;
2094}
2095
2096static int nfs4_purge_lease(struct nfs_client *clp)
2097{
2098 int status;
2099
2100 status = nfs4_establish_lease(clp);
2101 if (status < 0)
2102 return nfs4_handle_reclaim_lease_error(clp, status);
2103 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2104 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2105 nfs4_state_start_reclaim_nograce(clp);
2106 return 0;
2107}
2108
2109/*
2110 * Try remote migration of one FSID from a source server to a
2111 * destination server. The source server provides a list of
2112 * potential destinations.
2113 *
2114 * Returns zero or a negative NFS4ERR status code.
2115 */
2116static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2117{
2118 struct nfs_client *clp = server->nfs_client;
2119 struct nfs4_fs_locations *locations = NULL;
2120 struct inode *inode;
2121 struct page *page;
2122 int status, result;
2123
2124 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2125 (unsigned long long)server->fsid.major,
2126 (unsigned long long)server->fsid.minor,
2127 clp->cl_hostname);
2128
2129 result = 0;
2130 page = alloc_page(GFP_KERNEL);
2131 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2132 if (page == NULL || locations == NULL) {
2133 dprintk("<-- %s: no memory\n", __func__);
2134 goto out;
2135 }
2136 locations->fattr = nfs_alloc_fattr();
2137 if (locations->fattr == NULL) {
2138 dprintk("<-- %s: no memory\n", __func__);
2139 goto out;
2140 }
2141
2142 inode = d_inode(server->super->s_root);
2143 result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
2144 page, cred);
2145 if (result) {
2146 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2147 __func__, result);
2148 goto out;
2149 }
2150
2151 result = -NFS4ERR_NXIO;
2152 if (!locations->nlocations)
2153 goto out;
2154
2155 if (!(locations->fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2156 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2157 __func__);
2158 goto out;
2159 }
2160
2161 status = nfs4_begin_drain_session(clp);
2162 if (status != 0) {
2163 result = status;
2164 goto out;
2165 }
2166
2167 status = nfs4_replace_transport(server, locations);
2168 if (status != 0) {
2169 dprintk("<-- %s: failed to replace transport: %d\n",
2170 __func__, status);
2171 goto out;
2172 }
2173
2174 result = 0;
2175 dprintk("<-- %s: migration succeeded\n", __func__);
2176
2177out:
2178 if (page != NULL)
2179 __free_page(page);
2180 if (locations != NULL)
2181 kfree(locations->fattr);
2182 kfree(locations);
2183 if (result) {
2184 pr_err("NFS: migration recovery failed (server %s)\n",
2185 clp->cl_hostname);
2186 set_bit(NFS_MIG_FAILED, &server->mig_status);
2187 }
2188 return result;
2189}
2190
2191/*
2192 * Returns zero or a negative NFS4ERR status code.
2193 */
2194static int nfs4_handle_migration(struct nfs_client *clp)
2195{
2196 const struct nfs4_state_maintenance_ops *ops =
2197 clp->cl_mvops->state_renewal_ops;
2198 struct nfs_server *server;
2199 const struct cred *cred;
2200
2201 dprintk("%s: migration reported on \"%s\"\n", __func__,
2202 clp->cl_hostname);
2203
2204 cred = ops->get_state_renewal_cred(clp);
2205 if (cred == NULL)
2206 return -NFS4ERR_NOENT;
2207
2208 clp->cl_mig_gen++;
2209restart:
2210 rcu_read_lock();
2211 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2212 int status;
2213
2214 if (server->mig_gen == clp->cl_mig_gen)
2215 continue;
2216 server->mig_gen = clp->cl_mig_gen;
2217
2218 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2219 &server->mig_status))
2220 continue;
2221
2222 rcu_read_unlock();
2223 status = nfs4_try_migration(server, cred);
2224 if (status < 0) {
2225 put_cred(cred);
2226 return status;
2227 }
2228 goto restart;
2229 }
2230 rcu_read_unlock();
2231 put_cred(cred);
2232 return 0;
2233}
2234
2235/*
2236 * Test each nfs_server on the clp's cl_superblocks list to see
2237 * if it's moved to another server. Stop when the server no longer
2238 * returns NFS4ERR_LEASE_MOVED.
2239 */
2240static int nfs4_handle_lease_moved(struct nfs_client *clp)
2241{
2242 const struct nfs4_state_maintenance_ops *ops =
2243 clp->cl_mvops->state_renewal_ops;
2244 struct nfs_server *server;
2245 const struct cred *cred;
2246
2247 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2248 clp->cl_hostname);
2249
2250 cred = ops->get_state_renewal_cred(clp);
2251 if (cred == NULL)
2252 return -NFS4ERR_NOENT;
2253
2254 clp->cl_mig_gen++;
2255restart:
2256 rcu_read_lock();
2257 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2258 struct inode *inode;
2259 int status;
2260
2261 if (server->mig_gen == clp->cl_mig_gen)
2262 continue;
2263 server->mig_gen = clp->cl_mig_gen;
2264
2265 rcu_read_unlock();
2266
2267 inode = d_inode(server->super->s_root);
2268 status = nfs4_proc_fsid_present(inode, cred);
2269 if (status != -NFS4ERR_MOVED)
2270 goto restart; /* wasn't this one */
2271 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2272 goto restart; /* there are more */
2273 goto out;
2274 }
2275 rcu_read_unlock();
2276
2277out:
2278 put_cred(cred);
2279 return 0;
2280}
2281
2282/**
2283 * nfs4_discover_server_trunking - Detect server IP address trunking
2284 *
2285 * @clp: nfs_client under test
2286 * @result: OUT: found nfs_client, or clp
2287 *
2288 * Returns zero or a negative errno. If zero is returned,
2289 * an nfs_client pointer is planted in "result".
2290 *
2291 * Note: since we are invoked in process context, and
2292 * not from inside the state manager, we cannot use
2293 * nfs4_handle_reclaim_lease_error().
2294 */
2295int nfs4_discover_server_trunking(struct nfs_client *clp,
2296 struct nfs_client **result)
2297{
2298 const struct nfs4_state_recovery_ops *ops =
2299 clp->cl_mvops->reboot_recovery_ops;
2300 struct rpc_clnt *clnt;
2301 const struct cred *cred;
2302 int i, status;
2303
2304 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2305
2306 clnt = clp->cl_rpcclient;
2307 i = 0;
2308
2309 mutex_lock(&nfs_clid_init_mutex);
2310again:
2311 status = -ENOENT;
2312 cred = nfs4_get_clid_cred(clp);
2313 if (cred == NULL)
2314 goto out_unlock;
2315
2316 status = ops->detect_trunking(clp, result, cred);
2317 put_cred(cred);
2318 switch (status) {
2319 case 0:
2320 case -EINTR:
2321 case -ERESTARTSYS:
2322 break;
2323 case -ETIMEDOUT:
2324 if (clnt->cl_softrtry)
2325 break;
2326 fallthrough;
2327 case -NFS4ERR_DELAY:
2328 case -EAGAIN:
2329 ssleep(1);
2330 fallthrough;
2331 case -NFS4ERR_STALE_CLIENTID:
2332 dprintk("NFS: %s after status %d, retrying\n",
2333 __func__, status);
2334 goto again;
2335 case -EACCES:
2336 if (i++ == 0) {
2337 nfs4_root_machine_cred(clp);
2338 goto again;
2339 }
2340 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2341 break;
2342 fallthrough;
2343 case -NFS4ERR_CLID_INUSE:
2344 case -NFS4ERR_WRONGSEC:
2345 /* No point in retrying if we already used RPC_AUTH_UNIX */
2346 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2347 status = -EPERM;
2348 break;
2349 }
2350 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2351 if (IS_ERR(clnt)) {
2352 status = PTR_ERR(clnt);
2353 break;
2354 }
2355 /* Note: this is safe because we haven't yet marked the
2356 * client as ready, so we are the only user of
2357 * clp->cl_rpcclient
2358 */
2359 clnt = xchg(&clp->cl_rpcclient, clnt);
2360 rpc_shutdown_client(clnt);
2361 clnt = clp->cl_rpcclient;
2362 goto again;
2363
2364 case -NFS4ERR_MINOR_VERS_MISMATCH:
2365 status = -EPROTONOSUPPORT;
2366 break;
2367
2368 case -EKEYEXPIRED:
2369 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2370 * in nfs4_exchange_id */
2371 status = -EKEYEXPIRED;
2372 break;
2373 default:
2374 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2375 __func__, status);
2376 status = -EIO;
2377 }
2378
2379out_unlock:
2380 mutex_unlock(&nfs_clid_init_mutex);
2381 dprintk("NFS: %s: status = %d\n", __func__, status);
2382 return status;
2383}
2384
2385#ifdef CONFIG_NFS_V4_1
2386void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2387{
2388 struct nfs_client *clp = session->clp;
2389
2390 switch (err) {
2391 default:
2392 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2393 break;
2394 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2395 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2396 }
2397 nfs4_schedule_state_manager(clp);
2398}
2399EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2400
2401void nfs41_notify_server(struct nfs_client *clp)
2402{
2403 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2404 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2405 nfs4_schedule_state_manager(clp);
2406}
2407
2408static void nfs4_reset_all_state(struct nfs_client *clp)
2409{
2410 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2411 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2412 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2413 nfs4_state_start_reclaim_nograce(clp);
2414 dprintk("%s: scheduling reset of all state for server %s!\n",
2415 __func__, clp->cl_hostname);
2416 nfs4_schedule_state_manager(clp);
2417 }
2418}
2419
2420static void nfs41_handle_server_reboot(struct nfs_client *clp)
2421{
2422 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2423 nfs4_state_start_reclaim_reboot(clp);
2424 dprintk("%s: server %s rebooted!\n", __func__,
2425 clp->cl_hostname);
2426 nfs4_schedule_state_manager(clp);
2427 }
2428}
2429
2430static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2431{
2432 nfs4_reset_all_state(clp);
2433 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2434}
2435
2436static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2437{
2438 nfs4_state_start_reclaim_nograce(clp);
2439 nfs4_schedule_state_manager(clp);
2440
2441 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2442}
2443
2444static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2445{
2446 /* FIXME: For now, we destroy all layouts. */
2447 pnfs_destroy_all_layouts(clp);
2448 nfs_test_expired_all_delegations(clp);
2449 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2450 clp->cl_hostname);
2451}
2452
2453static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2454{
2455 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2456 nfs4_schedule_state_manager(clp);
2457
2458 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2459 clp->cl_hostname);
2460}
2461
2462static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2463{
2464 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2465 &clp->cl_state) == 0)
2466 nfs4_schedule_state_manager(clp);
2467}
2468
2469void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2470 bool recovery)
2471{
2472 if (!flags)
2473 return;
2474
2475 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2476 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2477 /*
2478 * If we're called from the state manager thread, then assume we're
2479 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2480 * Those flags are expected to remain set until we're done
2481 * recovering (see RFC5661, section 18.46.3).
2482 */
2483 if (recovery)
2484 goto out_recovery;
2485
2486 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2487 nfs41_handle_server_reboot(clp);
2488 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2489 nfs41_handle_all_state_revoked(clp);
2490 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2491 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2492 nfs41_handle_some_state_revoked(clp);
2493 if (flags & SEQ4_STATUS_LEASE_MOVED)
2494 nfs4_schedule_lease_moved_recovery(clp);
2495 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2496 nfs41_handle_recallable_state_revoked(clp);
2497out_recovery:
2498 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2499 nfs41_handle_backchannel_fault(clp);
2500 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2501 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2502 nfs41_handle_cb_path_down(clp);
2503}
2504
2505static int nfs4_reset_session(struct nfs_client *clp)
2506{
2507 const struct cred *cred;
2508 int status;
2509
2510 if (!nfs4_has_session(clp))
2511 return 0;
2512 status = nfs4_begin_drain_session(clp);
2513 if (status != 0)
2514 return status;
2515 cred = nfs4_get_clid_cred(clp);
2516 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2517 switch (status) {
2518 case 0:
2519 case -NFS4ERR_BADSESSION:
2520 case -NFS4ERR_DEADSESSION:
2521 break;
2522 case -NFS4ERR_BACK_CHAN_BUSY:
2523 case -NFS4ERR_DELAY:
2524 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2525 status = 0;
2526 ssleep(1);
2527 goto out;
2528 default:
2529 status = nfs4_recovery_handle_error(clp, status);
2530 goto out;
2531 }
2532
2533 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2534 status = nfs4_proc_create_session(clp, cred);
2535 if (status) {
2536 dprintk("%s: session reset failed with status %d for server %s!\n",
2537 __func__, status, clp->cl_hostname);
2538 status = nfs4_handle_reclaim_lease_error(clp, status);
2539 goto out;
2540 }
2541 nfs41_finish_session_reset(clp);
2542 dprintk("%s: session reset was successful for server %s!\n",
2543 __func__, clp->cl_hostname);
2544out:
2545 put_cred(cred);
2546 return status;
2547}
2548
2549static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2550{
2551 const struct cred *cred;
2552 int ret;
2553
2554 if (!nfs4_has_session(clp))
2555 return 0;
2556 ret = nfs4_begin_drain_session(clp);
2557 if (ret != 0)
2558 return ret;
2559 cred = nfs4_get_clid_cred(clp);
2560 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2561 put_cred(cred);
2562 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2563 switch (ret) {
2564 case 0:
2565 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2566 __func__, clp->cl_hostname);
2567 break;
2568 case -NFS4ERR_DELAY:
2569 ssleep(1);
2570 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2571 break;
2572 default:
2573 return nfs4_recovery_handle_error(clp, ret);
2574 }
2575 return 0;
2576}
2577
2578static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2579{
2580 int iomode = 0;
2581
2582 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2583 iomode += IOMODE_READ;
2584 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2585 iomode += IOMODE_RW;
2586 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2587 if (iomode) {
2588 pnfs_layout_return_unused_byclid(clp, iomode);
2589 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2590 }
2591}
2592#else /* CONFIG_NFS_V4_1 */
2593static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2594
2595static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2596{
2597 return 0;
2598}
2599
2600static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2601{
2602}
2603#endif /* CONFIG_NFS_V4_1 */
2604
2605static void nfs4_state_manager(struct nfs_client *clp)
2606{
2607 unsigned int memflags;
2608 int status = 0;
2609 const char *section = "", *section_sep = "";
2610
2611 /*
2612 * State recovery can deadlock if the direct reclaim code tries
2613 * start NFS writeback. So ensure memory allocations are all
2614 * GFP_NOFS.
2615 */
2616 memflags = memalloc_nofs_save();
2617
2618 /* Ensure exclusive access to NFSv4 state */
2619 do {
2620 trace_nfs4_state_mgr(clp);
2621 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2622 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2623 section = "purge state";
2624 status = nfs4_purge_lease(clp);
2625 if (status < 0)
2626 goto out_error;
2627 continue;
2628 }
2629
2630 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2631 section = "lease expired";
2632 /* We're going to have to re-establish a clientid */
2633 status = nfs4_reclaim_lease(clp);
2634 if (status < 0)
2635 goto out_error;
2636 continue;
2637 }
2638
2639 /* Initialize or reset the session */
2640 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2641 section = "reset session";
2642 status = nfs4_reset_session(clp);
2643 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2644 continue;
2645 if (status < 0)
2646 goto out_error;
2647 }
2648
2649 /* Send BIND_CONN_TO_SESSION */
2650 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2651 &clp->cl_state)) {
2652 section = "bind conn to session";
2653 status = nfs4_bind_conn_to_session(clp);
2654 if (status < 0)
2655 goto out_error;
2656 continue;
2657 }
2658
2659 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2660 section = "check lease";
2661 status = nfs4_check_lease(clp);
2662 if (status < 0)
2663 goto out_error;
2664 continue;
2665 }
2666
2667 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2668 section = "migration";
2669 status = nfs4_handle_migration(clp);
2670 if (status < 0)
2671 goto out_error;
2672 }
2673
2674 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2675 section = "lease moved";
2676 status = nfs4_handle_lease_moved(clp);
2677 if (status < 0)
2678 goto out_error;
2679 }
2680
2681 /* First recover reboot state... */
2682 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2683 section = "reclaim reboot";
2684 status = nfs4_do_reclaim(clp,
2685 clp->cl_mvops->reboot_recovery_ops);
2686 if (status == -EAGAIN)
2687 continue;
2688 if (status < 0)
2689 goto out_error;
2690 nfs4_state_end_reclaim_reboot(clp);
2691 continue;
2692 }
2693
2694 /* Detect expired delegations... */
2695 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2696 section = "detect expired delegations";
2697 nfs_reap_expired_delegations(clp);
2698 continue;
2699 }
2700
2701 /* Now recover expired state... */
2702 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2703 section = "reclaim nograce";
2704 status = nfs4_do_reclaim(clp,
2705 clp->cl_mvops->nograce_recovery_ops);
2706 if (status == -EAGAIN)
2707 continue;
2708 if (status < 0)
2709 goto out_error;
2710 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2711 }
2712
2713 memalloc_nofs_restore(memflags);
2714 nfs4_end_drain_session(clp);
2715 nfs4_clear_state_manager_bit(clp);
2716
2717 if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2718 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING,
2719 &clp->cl_state)) {
2720 memflags = memalloc_nofs_save();
2721 continue;
2722 }
2723
2724 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
2725 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2726 nfs_client_return_marked_delegations(clp);
2727 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2728 }
2729 nfs4_layoutreturn_any_run(clp);
2730 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
2731 }
2732
2733 return;
2734
2735 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2736 goto out_drain;
2737
2738out_error:
2739 if (strlen(section))
2740 section_sep = ": ";
2741 trace_nfs4_state_mgr_failed(clp, section, status);
2742 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2743 " with error %d\n", section_sep, section,
2744 clp->cl_hostname, -status);
2745 ssleep(1);
2746out_drain:
2747 memalloc_nofs_restore(memflags);
2748 nfs4_end_drain_session(clp);
2749 nfs4_clear_state_manager_bit(clp);
2750}
2751
2752static int nfs4_run_state_manager(void *ptr)
2753{
2754 struct nfs_client *clp = ptr;
2755 struct rpc_clnt *cl = clp->cl_rpcclient;
2756
2757 while (cl != cl->cl_parent)
2758 cl = cl->cl_parent;
2759
2760 allow_signal(SIGKILL);
2761again:
2762 nfs4_state_manager(clp);
2763
2764 if (test_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) &&
2765 !test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state)) {
2766 wait_var_event_interruptible(&clp->cl_state,
2767 test_bit(NFS4CLNT_RUN_MANAGER,
2768 &clp->cl_state));
2769 if (!atomic_read(&cl->cl_swapper))
2770 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2771 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2772 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2773 goto again;
2774 /* Either no longer a swapper, or were signalled */
2775 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2776 }
2777
2778 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2779 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2780 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2781 goto again;
2782
2783 nfs_put_client(clp);
2784 module_put_and_kthread_exit(0);
2785 return 0;
2786}