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: &fsinfo);
105 if (status == 0) {
106 nfs4_set_lease_period(clp, lease: 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(net: clp->cl_net, id: 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(nr: NFS4CLNT_LEASE_CONFIRM, addr: &clp->cl_state);
135do_confirm:
136 status = nfs4_proc_setclientid_confirm(clp, arg: &clid, cred);
137 if (status != 0)
138 goto out;
139 clear_bit(nr: NFS4CLNT_LEASE_CONFIRM, addr: &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(net: clp->cl_net, id: 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(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(head: &sp->so_states))
219 continue;
220 cred = get_cred(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(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(lock: &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(nr: NFS4_SLOT_TBL_DRAINING, addr: &tbl->slot_tbl_state)) {
260 spin_lock(lock: &tbl->slot_tbl_lock);
261 nfs41_wake_slot_table(tbl);
262 spin_unlock(lock: &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(tbl: clp->cl_slot_tbl);
272 return;
273 }
274
275 if (ses != NULL) {
276 nfs4_end_drain_slot_table(tbl: &ses->bc_slot_table);
277 nfs4_end_drain_slot_table(tbl: &ses->fc_slot_table);
278 }
279}
280
281static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
282{
283 set_bit(nr: NFS4_SLOT_TBL_DRAINING, addr: &tbl->slot_tbl_state);
284 spin_lock(lock: &tbl->slot_tbl_lock);
285 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
286 reinit_completion(x: &tbl->complete);
287 spin_unlock(lock: &tbl->slot_tbl_lock);
288 return wait_for_completion_interruptible(x: &tbl->complete);
289 }
290 spin_unlock(lock: &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(tbl: clp->cl_slot_tbl);
301
302 /* back channel */
303 ret = nfs4_drain_slot_tbl(tbl: &ses->bc_slot_table);
304 if (ret)
305 return ret;
306 /* fore channel */
307 return nfs4_drain_slot_tbl(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(head: &sp->so_lru))
425 list_del_init(entry: &sp->so_lru);
426 atomic_inc(v: &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(head: &sp->so_lru))
453 list_del_init(entry: &sp->so_lru);
454 atomic_inc(v: &sp->so_count);
455 return sp;
456 }
457 }
458 rb_link_node(node: &new->so_server_node, parent, rb_link: 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(list: &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 = atomic64_inc_return(v: &server->owner_ctr);
505 sp->so_server = server;
506 sp->so_cred = get_cred(cred);
507 spin_lock_init(&sp->so_lock);
508 INIT_LIST_HEAD(list: &sp->so_states);
509 nfs4_init_seqid_counter(sc: &sp->so_seqid);
510 atomic_set(v: &sp->so_count, i: 1);
511 INIT_LIST_HEAD(list: &sp->so_lru);
512 mutex_init(&sp->so_delegreturn_mutex);
513 return sp;
514}
515
516static void
517nfs4_reset_state_owner(struct nfs4_state_owner *sp)
518{
519 /* This state_owner is no longer usable, but must
520 * remain in place so that state recovery can find it
521 * and the opens associated with it.
522 * It may also be used for new 'open' request to
523 * return a delegation to the server.
524 * So update the 'create_time' so that it looks like
525 * a new state_owner. This will cause the server to
526 * request an OPEN_CONFIRM to start a new sequence.
527 */
528 sp->so_seqid.create_time = ktime_get();
529}
530
531static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
532{
533 nfs4_destroy_seqid_counter(sc: &sp->so_seqid);
534 put_cred(cred: sp->so_cred);
535 kfree(objp: sp);
536}
537
538static void nfs4_gc_state_owners(struct nfs_server *server)
539{
540 struct nfs_client *clp = server->nfs_client;
541 struct nfs4_state_owner *sp, *tmp;
542 unsigned long time_min, time_max;
543 LIST_HEAD(doomed);
544
545 spin_lock(lock: &clp->cl_lock);
546 time_max = jiffies;
547 time_min = (long)time_max - (long)clp->cl_lease_time;
548 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
549 /* NB: LRU is sorted so that oldest is at the head */
550 if (time_in_range(sp->so_expires, time_min, time_max))
551 break;
552 list_move(list: &sp->so_lru, head: &doomed);
553 nfs4_remove_state_owner_locked(sp);
554 }
555 spin_unlock(lock: &clp->cl_lock);
556
557 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
558 list_del(entry: &sp->so_lru);
559 nfs4_free_state_owner(sp);
560 }
561}
562
563/**
564 * nfs4_get_state_owner - Look up a state owner given a credential
565 * @server: nfs_server to search
566 * @cred: RPC credential to match
567 * @gfp_flags: allocation mode
568 *
569 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
570 */
571struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
572 const struct cred *cred,
573 gfp_t gfp_flags)
574{
575 struct nfs_client *clp = server->nfs_client;
576 struct nfs4_state_owner *sp, *new;
577
578 spin_lock(lock: &clp->cl_lock);
579 sp = nfs4_find_state_owner_locked(server, cred);
580 spin_unlock(lock: &clp->cl_lock);
581 if (sp != NULL)
582 goto out;
583 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
584 if (new == NULL)
585 goto out;
586 spin_lock(lock: &clp->cl_lock);
587 sp = nfs4_insert_state_owner_locked(new);
588 spin_unlock(lock: &clp->cl_lock);
589 if (sp != new)
590 nfs4_free_state_owner(sp: new);
591out:
592 nfs4_gc_state_owners(server);
593 return sp;
594}
595
596/**
597 * nfs4_put_state_owner - Release a nfs4_state_owner
598 * @sp: state owner data to release
599 *
600 * Note that we keep released state owners on an LRU
601 * list.
602 * This caches valid state owners so that they can be
603 * reused, to avoid the OPEN_CONFIRM on minor version 0.
604 * It also pins the uniquifier of dropped state owners for
605 * a while, to ensure that those state owner names are
606 * never reused.
607 */
608void nfs4_put_state_owner(struct nfs4_state_owner *sp)
609{
610 struct nfs_server *server = sp->so_server;
611 struct nfs_client *clp = server->nfs_client;
612
613 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
614 return;
615
616 sp->so_expires = jiffies;
617 list_add_tail(new: &sp->so_lru, head: &server->state_owners_lru);
618 spin_unlock(lock: &clp->cl_lock);
619}
620
621/**
622 * nfs4_purge_state_owners - Release all cached state owners
623 * @server: nfs_server with cached state owners to release
624 * @head: resulting list of state owners
625 *
626 * Called at umount time. Remaining state owners will be on
627 * the LRU with ref count of zero.
628 * Note that the state owners are not freed, but are added
629 * to the list @head, which can later be used as an argument
630 * to nfs4_free_state_owners.
631 */
632void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
633{
634 struct nfs_client *clp = server->nfs_client;
635 struct nfs4_state_owner *sp, *tmp;
636
637 spin_lock(lock: &clp->cl_lock);
638 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
639 list_move(list: &sp->so_lru, head);
640 nfs4_remove_state_owner_locked(sp);
641 }
642 spin_unlock(lock: &clp->cl_lock);
643}
644
645/**
646 * nfs4_free_state_owners - Release all cached state owners
647 * @head: resulting list of state owners
648 *
649 * Frees a list of state owners that was generated by
650 * nfs4_purge_state_owners
651 */
652void nfs4_free_state_owners(struct list_head *head)
653{
654 struct nfs4_state_owner *sp, *tmp;
655
656 list_for_each_entry_safe(sp, tmp, head, so_lru) {
657 list_del(entry: &sp->so_lru);
658 nfs4_free_state_owner(sp);
659 }
660}
661
662static struct nfs4_state *
663nfs4_alloc_open_state(void)
664{
665 struct nfs4_state *state;
666
667 state = kzalloc(sizeof(*state), GFP_KERNEL_ACCOUNT);
668 if (!state)
669 return NULL;
670 refcount_set(r: &state->count, n: 1);
671 INIT_LIST_HEAD(list: &state->lock_states);
672 spin_lock_init(&state->state_lock);
673 seqlock_init(&state->seqlock);
674 init_waitqueue_head(&state->waitq);
675 return state;
676}
677
678void
679nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
680{
681 if (state->state == fmode)
682 return;
683 /* NB! List reordering - see the reclaim code for why. */
684 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
685 if (fmode & FMODE_WRITE)
686 list_move(list: &state->open_states, head: &state->owner->so_states);
687 else
688 list_move_tail(list: &state->open_states, head: &state->owner->so_states);
689 }
690 state->state = fmode;
691}
692
693static struct nfs4_state *
694__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
695{
696 struct nfs_inode *nfsi = NFS_I(inode);
697 struct nfs4_state *state;
698
699 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
700 if (state->owner != owner)
701 continue;
702 if (!nfs4_valid_open_stateid(state))
703 continue;
704 if (refcount_inc_not_zero(r: &state->count))
705 return state;
706 }
707 return NULL;
708}
709
710static void
711nfs4_free_open_state(struct nfs4_state *state)
712{
713 kfree_rcu(state, rcu_head);
714}
715
716struct nfs4_state *
717nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
718{
719 struct nfs4_state *state, *new;
720 struct nfs_inode *nfsi = NFS_I(inode);
721
722 rcu_read_lock();
723 state = __nfs4_find_state_byowner(inode, owner);
724 rcu_read_unlock();
725 if (state)
726 goto out;
727 new = nfs4_alloc_open_state();
728 spin_lock(lock: &owner->so_lock);
729 spin_lock(lock: &inode->i_lock);
730 state = __nfs4_find_state_byowner(inode, owner);
731 if (state == NULL && new != NULL) {
732 state = new;
733 state->owner = owner;
734 atomic_inc(v: &owner->so_count);
735 ihold(inode);
736 state->inode = inode;
737 list_add_rcu(new: &state->inode_states, head: &nfsi->open_states);
738 spin_unlock(lock: &inode->i_lock);
739 /* Note: The reclaim code dictates that we add stateless
740 * and read-only stateids to the end of the list */
741 list_add_tail(new: &state->open_states, head: &owner->so_states);
742 spin_unlock(lock: &owner->so_lock);
743 } else {
744 spin_unlock(lock: &inode->i_lock);
745 spin_unlock(lock: &owner->so_lock);
746 if (new)
747 nfs4_free_open_state(state: new);
748 }
749out:
750 return state;
751}
752
753void nfs4_put_open_state(struct nfs4_state *state)
754{
755 struct inode *inode = state->inode;
756 struct nfs4_state_owner *owner = state->owner;
757
758 if (!refcount_dec_and_lock(r: &state->count, lock: &owner->so_lock))
759 return;
760 spin_lock(lock: &inode->i_lock);
761 list_del_rcu(entry: &state->inode_states);
762 list_del(entry: &state->open_states);
763 spin_unlock(lock: &inode->i_lock);
764 spin_unlock(lock: &owner->so_lock);
765 nfs4_inode_return_delegation_on_close(inode);
766 iput(inode);
767 nfs4_free_open_state(state);
768 nfs4_put_state_owner(sp: owner);
769}
770
771/*
772 * Close the current file.
773 */
774static void __nfs4_close(struct nfs4_state *state,
775 fmode_t fmode, gfp_t gfp_mask, int wait)
776{
777 struct nfs4_state_owner *owner = state->owner;
778 int call_close = 0;
779 fmode_t newstate;
780
781 atomic_inc(v: &owner->so_count);
782 /* Protect against nfs4_find_state() */
783 spin_lock(lock: &owner->so_lock);
784 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
785 case FMODE_READ:
786 state->n_rdonly--;
787 break;
788 case FMODE_WRITE:
789 state->n_wronly--;
790 break;
791 case FMODE_READ|FMODE_WRITE:
792 state->n_rdwr--;
793 }
794 newstate = FMODE_READ|FMODE_WRITE;
795 if (state->n_rdwr == 0) {
796 if (state->n_rdonly == 0) {
797 newstate &= ~FMODE_READ;
798 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
799 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
800 }
801 if (state->n_wronly == 0) {
802 newstate &= ~FMODE_WRITE;
803 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
804 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
805 }
806 if (newstate == 0)
807 clear_bit(nr: NFS_DELEGATED_STATE, addr: &state->flags);
808 }
809 nfs4_state_set_mode_locked(state, fmode: newstate);
810 spin_unlock(lock: &owner->so_lock);
811
812 if (!call_close) {
813 nfs4_put_open_state(state);
814 nfs4_put_state_owner(sp: owner);
815 } else
816 nfs4_do_close(state, gfp_mask, wait);
817}
818
819void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
820{
821 __nfs4_close(state, fmode, GFP_KERNEL, wait: 0);
822}
823
824void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
825{
826 __nfs4_close(state, fmode, GFP_KERNEL, wait: 1);
827}
828
829/*
830 * Search the state->lock_states for an existing lock_owner
831 * that is compatible with either of the given owners.
832 * If the second is non-zero, then the first refers to a Posix-lock
833 * owner (current->files) and the second refers to a flock/OFD
834 * owner (struct file*). In that case, prefer a match for the first
835 * owner.
836 * If both sorts of locks are held on the one file we cannot know
837 * which stateid was intended to be used, so a "correct" choice cannot
838 * be made. Failing that, a "consistent" choice is preferable. The
839 * consistent choice we make is to prefer the first owner, that of a
840 * Posix lock.
841 */
842static struct nfs4_lock_state *
843__nfs4_find_lock_state(struct nfs4_state *state,
844 fl_owner_t owner, fl_owner_t owner2)
845{
846 struct nfs4_lock_state *pos, *ret = NULL;
847 list_for_each_entry(pos, &state->lock_states, ls_locks) {
848 if (pos->ls_owner == owner) {
849 ret = pos;
850 break;
851 }
852 if (pos->ls_owner == owner2)
853 ret = pos;
854 }
855 if (ret)
856 refcount_inc(r: &ret->ls_count);
857 return ret;
858}
859
860/*
861 * Return a compatible lock_state. If no initialized lock_state structure
862 * exists, return an uninitialized one.
863 *
864 */
865static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t owner)
866{
867 struct nfs4_lock_state *lsp;
868 struct nfs_server *server = state->owner->so_server;
869
870 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL_ACCOUNT);
871 if (lsp == NULL)
872 return NULL;
873 nfs4_init_seqid_counter(sc: &lsp->ls_seqid);
874 refcount_set(r: &lsp->ls_count, n: 1);
875 lsp->ls_state = state;
876 lsp->ls_owner = owner;
877 lsp->ls_seqid.owner_id = atomic64_inc_return(v: &server->owner_ctr);
878 INIT_LIST_HEAD(list: &lsp->ls_locks);
879 return lsp;
880}
881
882void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
883{
884 nfs4_destroy_seqid_counter(sc: &lsp->ls_seqid);
885 kfree(objp: lsp);
886}
887
888/*
889 * Return a compatible lock_state. If no initialized lock_state structure
890 * exists, return an uninitialized one.
891 *
892 */
893static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
894{
895 struct nfs4_lock_state *lsp, *new = NULL;
896
897 for(;;) {
898 spin_lock(lock: &state->state_lock);
899 lsp = __nfs4_find_lock_state(state, owner, NULL);
900 if (lsp != NULL)
901 break;
902 if (new != NULL) {
903 list_add(new: &new->ls_locks, head: &state->lock_states);
904 set_bit(nr: LK_STATE_IN_USE, addr: &state->flags);
905 lsp = new;
906 new = NULL;
907 break;
908 }
909 spin_unlock(lock: &state->state_lock);
910 new = nfs4_alloc_lock_state(state, owner);
911 if (new == NULL)
912 return NULL;
913 }
914 spin_unlock(lock: &state->state_lock);
915 if (new != NULL)
916 nfs4_free_lock_state(server: state->owner->so_server, lsp: new);
917 return lsp;
918}
919
920/*
921 * Release reference to lock_state, and free it if we see that
922 * it is no longer in use
923 */
924void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
925{
926 struct nfs_server *server;
927 struct nfs4_state *state;
928
929 if (lsp == NULL)
930 return;
931 state = lsp->ls_state;
932 if (!refcount_dec_and_lock(r: &lsp->ls_count, lock: &state->state_lock))
933 return;
934 list_del(entry: &lsp->ls_locks);
935 if (list_empty(head: &state->lock_states))
936 clear_bit(nr: LK_STATE_IN_USE, addr: &state->flags);
937 spin_unlock(lock: &state->state_lock);
938 server = state->owner->so_server;
939 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
940 struct nfs_client *clp = server->nfs_client;
941
942 clp->cl_mvops->free_lock_state(server, lsp);
943 } else
944 nfs4_free_lock_state(server, lsp);
945}
946
947static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
948{
949 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
950
951 dst->fl_u.nfs4_fl.owner = lsp;
952 refcount_inc(r: &lsp->ls_count);
953}
954
955static void nfs4_fl_release_lock(struct file_lock *fl)
956{
957 nfs4_put_lock_state(lsp: fl->fl_u.nfs4_fl.owner);
958}
959
960static const struct file_lock_operations nfs4_fl_lock_ops = {
961 .fl_copy_lock = nfs4_fl_copy_lock,
962 .fl_release_private = nfs4_fl_release_lock,
963};
964
965int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
966{
967 struct nfs4_lock_state *lsp;
968
969 if (fl->fl_ops != NULL)
970 return 0;
971 lsp = nfs4_get_lock_state(state, owner: fl->c.flc_owner);
972 if (lsp == NULL)
973 return -ENOMEM;
974 fl->fl_u.nfs4_fl.owner = lsp;
975 fl->fl_ops = &nfs4_fl_lock_ops;
976 return 0;
977}
978
979static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
980 struct nfs4_state *state,
981 const struct nfs_lock_context *l_ctx)
982{
983 struct nfs4_lock_state *lsp;
984 fl_owner_t owner, fl_flock_owner;
985 int ret = -ENOENT;
986
987 if (l_ctx == NULL)
988 goto out;
989
990 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
991 goto out;
992
993 owner = l_ctx->lockowner;
994 fl_flock_owner = l_ctx->open_context->flock_owner;
995
996 spin_lock(lock: &state->state_lock);
997 lsp = __nfs4_find_lock_state(state, owner, owner2: fl_flock_owner);
998 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
999 ret = -EIO;
1000 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1001 nfs4_stateid_copy(dst, src: &lsp->ls_stateid);
1002 ret = 0;
1003 }
1004 spin_unlock(lock: &state->state_lock);
1005 nfs4_put_lock_state(lsp);
1006out:
1007 return ret;
1008}
1009
1010bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1011{
1012 bool ret;
1013 const nfs4_stateid *src;
1014 int seq;
1015
1016 do {
1017 ret = false;
1018 src = &zero_stateid;
1019 seq = read_seqbegin(sl: &state->seqlock);
1020 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1021 src = &state->open_stateid;
1022 ret = true;
1023 }
1024 nfs4_stateid_copy(dst, src);
1025 } while (read_seqretry(sl: &state->seqlock, start: seq));
1026 return ret;
1027}
1028
1029/*
1030 * Byte-range lock aware utility to initialize the stateid of read/write
1031 * requests.
1032 */
1033int nfs4_select_rw_stateid(struct nfs4_state *state,
1034 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1035 nfs4_stateid *dst, const struct cred **cred)
1036{
1037 int ret;
1038
1039 if (!nfs4_valid_open_stateid(state))
1040 return -EIO;
1041 if (cred != NULL)
1042 *cred = NULL;
1043 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1044 if (ret == -EIO)
1045 /* A lost lock - don't even consider delegations */
1046 goto out;
1047 /* returns true if delegation stateid found and copied */
1048 if (nfs4_copy_delegation_stateid(inode: state->inode, flags: fmode, dst, cred)) {
1049 ret = 0;
1050 goto out;
1051 }
1052 if (ret != -ENOENT)
1053 /* nfs4_copy_delegation_stateid() didn't over-write
1054 * dst, so it still has the lock stateid which we now
1055 * choose to use.
1056 */
1057 goto out;
1058 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1059out:
1060 if (nfs_server_capable(inode: state->inode, NFS_CAP_STATEID_NFSV41))
1061 dst->seqid = 0;
1062 return ret;
1063}
1064
1065struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1066{
1067 struct nfs_seqid *new;
1068
1069 new = kmalloc(sizeof(*new), gfp_mask);
1070 if (new == NULL)
1071 return ERR_PTR(error: -ENOMEM);
1072 new->sequence = counter;
1073 INIT_LIST_HEAD(list: &new->list);
1074 new->task = NULL;
1075 return new;
1076}
1077
1078void nfs_release_seqid(struct nfs_seqid *seqid)
1079{
1080 struct nfs_seqid_counter *sequence;
1081
1082 if (seqid == NULL || list_empty(head: &seqid->list))
1083 return;
1084 sequence = seqid->sequence;
1085 spin_lock(lock: &sequence->lock);
1086 if (list_is_first(list: &seqid->list, head: &sequence->list) &&
1087 !list_is_singular(head: &sequence->list)) {
1088 struct nfs_seqid *next = list_next_entry(seqid, list);
1089 rpc_wake_up_queued_task(&sequence->wait, next->task);
1090 }
1091 list_del_init(entry: &seqid->list);
1092 spin_unlock(lock: &sequence->lock);
1093}
1094
1095void nfs_free_seqid(struct nfs_seqid *seqid)
1096{
1097 nfs_release_seqid(seqid);
1098 kfree(objp: seqid);
1099}
1100
1101/*
1102 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1103 * failed with a seqid incrementing error -
1104 * see comments nfs4.h:seqid_mutating_error()
1105 */
1106static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1107{
1108 switch (status) {
1109 case 0:
1110 break;
1111 case -NFS4ERR_BAD_SEQID:
1112 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1113 return;
1114 pr_warn_ratelimited("NFS: v4 server returned a bad"
1115 " sequence-id error on an"
1116 " unconfirmed sequence %p!\n",
1117 seqid->sequence);
1118 return;
1119 case -NFS4ERR_STALE_CLIENTID:
1120 case -NFS4ERR_STALE_STATEID:
1121 case -NFS4ERR_BAD_STATEID:
1122 case -NFS4ERR_BADXDR:
1123 case -NFS4ERR_RESOURCE:
1124 case -NFS4ERR_NOFILEHANDLE:
1125 case -NFS4ERR_MOVED:
1126 /* Non-seqid mutating errors */
1127 return;
1128 }
1129 /*
1130 * Note: no locking needed as we are guaranteed to be first
1131 * on the sequence list
1132 */
1133 seqid->sequence->counter++;
1134}
1135
1136void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1137{
1138 struct nfs4_state_owner *sp;
1139
1140 if (seqid == NULL)
1141 return;
1142
1143 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1144 if (status == -NFS4ERR_BAD_SEQID)
1145 nfs4_reset_state_owner(sp);
1146 if (!nfs4_has_session(clp: sp->so_server->nfs_client))
1147 nfs_increment_seqid(status, seqid);
1148}
1149
1150/*
1151 * Increment the seqid if the LOCK/LOCKU succeeded, or
1152 * failed with a seqid incrementing error -
1153 * see comments nfs4.h:seqid_mutating_error()
1154 */
1155void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1156{
1157 if (seqid != NULL)
1158 nfs_increment_seqid(status, seqid);
1159}
1160
1161int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1162{
1163 struct nfs_seqid_counter *sequence;
1164 int status = 0;
1165
1166 if (seqid == NULL)
1167 goto out;
1168 sequence = seqid->sequence;
1169 spin_lock(lock: &sequence->lock);
1170 seqid->task = task;
1171 if (list_empty(head: &seqid->list))
1172 list_add_tail(new: &seqid->list, head: &sequence->list);
1173 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1174 goto unlock;
1175 rpc_sleep_on(&sequence->wait, task, NULL);
1176 status = -EAGAIN;
1177unlock:
1178 spin_unlock(lock: &sequence->lock);
1179out:
1180 return status;
1181}
1182
1183static int nfs4_run_state_manager(void *);
1184
1185static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1186{
1187 clear_and_wake_up_bit(bit: NFS4CLNT_MANAGER_RUNNING, word: &clp->cl_state);
1188 rpc_wake_up(&clp->cl_rpcwaitq);
1189}
1190
1191/*
1192 * Schedule the nfs_client asynchronous state management routine
1193 */
1194void nfs4_schedule_state_manager(struct nfs_client *clp)
1195{
1196 struct task_struct *task;
1197 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1198 struct rpc_clnt *clnt = clp->cl_rpcclient;
1199 bool swapon = false;
1200
1201 if (clp->cl_cons_state < 0)
1202 return;
1203
1204 set_bit(nr: NFS4CLNT_RUN_MANAGER, addr: &clp->cl_state);
1205
1206 if (atomic_read(v: &clnt->cl_swapper)) {
1207 swapon = !test_and_set_bit(nr: NFS4CLNT_MANAGER_AVAILABLE,
1208 addr: &clp->cl_state);
1209 if (!swapon) {
1210 wake_up_var(var: &clp->cl_state);
1211 return;
1212 }
1213 }
1214
1215 if (test_and_set_bit(nr: NFS4CLNT_MANAGER_RUNNING, addr: &clp->cl_state) != 0)
1216 return;
1217
1218 __module_get(THIS_MODULE);
1219 refcount_inc(r: &clp->cl_count);
1220
1221 /* The rcu_read_lock() is not strictly necessary, as the state
1222 * manager is the only thread that ever changes the rpc_xprt
1223 * after it's initialized. At this point, we're single threaded. */
1224 rcu_read_lock();
1225 snprintf(buf, size: sizeof(buf), fmt: "%s-manager",
1226 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1227 rcu_read_unlock();
1228 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1229 if (IS_ERR(ptr: task)) {
1230 printk(KERN_ERR "%s: kthread_run: %ld\n",
1231 __func__, PTR_ERR(task));
1232 if (!nfs_client_init_is_complete(clp))
1233 nfs_mark_client_ready(clp, state: PTR_ERR(ptr: task));
1234 if (swapon)
1235 clear_bit(nr: NFS4CLNT_MANAGER_AVAILABLE, addr: &clp->cl_state);
1236 nfs4_clear_state_manager_bit(clp);
1237 nfs_put_client(clp);
1238 module_put(THIS_MODULE);
1239 }
1240}
1241
1242/*
1243 * Schedule a lease recovery attempt
1244 */
1245void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1246{
1247 if (!clp)
1248 return;
1249 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1250 set_bit(nr: NFS4CLNT_CHECK_LEASE, addr: &clp->cl_state);
1251 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1252 clp->cl_hostname);
1253 nfs4_schedule_state_manager(clp);
1254}
1255EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1256
1257/**
1258 * nfs4_schedule_migration_recovery - trigger migration recovery
1259 *
1260 * @server: FSID that is migrating
1261 *
1262 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1263 * value is returned.
1264 */
1265int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1266{
1267 struct nfs_client *clp = server->nfs_client;
1268
1269 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1270 pr_err("NFS: volatile file handles not supported (server %s)\n",
1271 clp->cl_hostname);
1272 return -NFS4ERR_IO;
1273 }
1274
1275 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1276 return -NFS4ERR_IO;
1277
1278 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1279 __func__,
1280 (unsigned long long)server->fsid.major,
1281 (unsigned long long)server->fsid.minor,
1282 clp->cl_hostname);
1283
1284 set_bit(NFS_MIG_IN_TRANSITION,
1285 addr: &((struct nfs_server *)server)->mig_status);
1286 set_bit(nr: NFS4CLNT_MOVED, addr: &clp->cl_state);
1287
1288 nfs4_schedule_state_manager(clp);
1289 return 0;
1290}
1291EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1292
1293/**
1294 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1295 *
1296 * @clp: server to check for moved leases
1297 *
1298 */
1299void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1300{
1301 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1302 __func__, clp->cl_clientid, clp->cl_hostname);
1303
1304 set_bit(nr: NFS4CLNT_LEASE_MOVED, addr: &clp->cl_state);
1305 nfs4_schedule_state_manager(clp);
1306}
1307EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1308
1309int nfs4_wait_clnt_recover(struct nfs_client *clp)
1310{
1311 int res;
1312
1313 might_sleep();
1314
1315 refcount_inc(r: &clp->cl_count);
1316 res = wait_on_bit_action(word: &clp->cl_state, bit: NFS4CLNT_MANAGER_RUNNING,
1317 action: nfs_wait_bit_killable,
1318 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1319 if (res)
1320 goto out;
1321 if (clp->cl_cons_state < 0)
1322 res = clp->cl_cons_state;
1323out:
1324 nfs_put_client(clp);
1325 return res;
1326}
1327
1328int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1329{
1330 unsigned int loop;
1331 int ret;
1332
1333 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1334 ret = nfs4_wait_clnt_recover(clp);
1335 if (ret != 0)
1336 break;
1337 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1338 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1339 break;
1340 nfs4_schedule_state_manager(clp);
1341 ret = -EIO;
1342 }
1343 return ret;
1344}
1345
1346/*
1347 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1348 * @clp: client to process
1349 *
1350 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1351 * resend of the SETCLIENTID and hence re-establish the
1352 * callback channel. Then return all existing delegations.
1353 */
1354static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1355{
1356 set_bit(nr: NFS4CLNT_LEASE_EXPIRED, addr: &clp->cl_state);
1357 nfs_expire_all_delegations(clp);
1358 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1359 clp->cl_hostname);
1360}
1361
1362void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1363{
1364 nfs40_handle_cb_pathdown(clp);
1365 nfs4_schedule_state_manager(clp);
1366}
1367
1368static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1369{
1370
1371 if (!nfs4_valid_open_stateid(state))
1372 return 0;
1373 set_bit(nr: NFS_STATE_RECLAIM_REBOOT, addr: &state->flags);
1374 /* Don't recover state that expired before the reboot */
1375 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1376 clear_bit(nr: NFS_STATE_RECLAIM_REBOOT, addr: &state->flags);
1377 return 0;
1378 }
1379 set_bit(nr: NFS_OWNER_RECLAIM_REBOOT, addr: &state->owner->so_flags);
1380 set_bit(nr: NFS4CLNT_RECLAIM_REBOOT, addr: &clp->cl_state);
1381 return 1;
1382}
1383
1384int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1385{
1386 if (!nfs4_valid_open_stateid(state))
1387 return 0;
1388 set_bit(nr: NFS_STATE_RECLAIM_NOGRACE, addr: &state->flags);
1389 clear_bit(nr: NFS_STATE_RECLAIM_REBOOT, addr: &state->flags);
1390 set_bit(nr: NFS_OWNER_RECLAIM_NOGRACE, addr: &state->owner->so_flags);
1391 set_bit(nr: NFS4CLNT_RECLAIM_NOGRACE, addr: &clp->cl_state);
1392 return 1;
1393}
1394
1395int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1396{
1397 struct nfs_client *clp = server->nfs_client;
1398
1399 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1400 return -EBADF;
1401 nfs_inode_find_delegation_state_and_recover(inode: state->inode,
1402 stateid: &state->stateid);
1403 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1404 clp->cl_hostname);
1405 nfs4_schedule_state_manager(clp);
1406 return clp->cl_cons_state < 0 ? clp->cl_cons_state : 0;
1407}
1408EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1409
1410static struct nfs4_lock_state *
1411nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1412 const nfs4_stateid *stateid)
1413{
1414 struct nfs4_lock_state *pos;
1415
1416 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1417 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1418 continue;
1419 if (nfs4_stateid_match_or_older(dst: &pos->ls_stateid, src: stateid))
1420 return pos;
1421 }
1422 return NULL;
1423}
1424
1425static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1426 const nfs4_stateid *stateid)
1427{
1428 bool found = false;
1429
1430 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1431 spin_lock(lock: &state->state_lock);
1432 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1433 found = true;
1434 spin_unlock(lock: &state->state_lock);
1435 }
1436 return found;
1437}
1438
1439void nfs_inode_find_state_and_recover(struct inode *inode,
1440 const nfs4_stateid *stateid)
1441{
1442 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1443 struct nfs_inode *nfsi = NFS_I(inode);
1444 struct nfs_open_context *ctx;
1445 struct nfs4_state *state;
1446 bool found = false;
1447
1448 rcu_read_lock();
1449 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1450 state = ctx->state;
1451 if (state == NULL)
1452 continue;
1453 if (nfs4_stateid_match_or_older(dst: &state->stateid, src: stateid) &&
1454 nfs4_state_mark_reclaim_nograce(clp, state)) {
1455 found = true;
1456 continue;
1457 }
1458 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1459 nfs4_stateid_match_or_older(dst: &state->open_stateid, src: stateid) &&
1460 nfs4_state_mark_reclaim_nograce(clp, state)) {
1461 found = true;
1462 continue;
1463 }
1464 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1465 nfs4_state_mark_reclaim_nograce(clp, state))
1466 found = true;
1467 }
1468 rcu_read_unlock();
1469
1470 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1471 if (found)
1472 nfs4_schedule_state_manager(clp);
1473}
1474
1475static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1476{
1477 struct inode *inode = state->inode;
1478 struct nfs_inode *nfsi = NFS_I(inode);
1479 struct nfs_open_context *ctx;
1480
1481 rcu_read_lock();
1482 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1483 if (ctx->state != state)
1484 continue;
1485 set_bit(NFS_CONTEXT_BAD, addr: &ctx->flags);
1486 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1487 "error = %d\n", ctx->dentry, err);
1488 }
1489 rcu_read_unlock();
1490}
1491
1492static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1493{
1494 set_bit(nr: NFS_STATE_RECOVERY_FAILED, addr: &state->flags);
1495 nfs4_state_mark_open_context_bad(state, err: error);
1496}
1497
1498
1499static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1500{
1501 struct inode *inode = state->inode;
1502 struct nfs_inode *nfsi = NFS_I(inode);
1503 struct file_lock *fl;
1504 struct nfs4_lock_state *lsp;
1505 int status = 0;
1506 struct file_lock_context *flctx = locks_inode_context(inode);
1507 struct list_head *list;
1508
1509 if (flctx == NULL)
1510 return 0;
1511
1512 list = &flctx->flc_posix;
1513
1514 /* Guard against delegation returns and new lock/unlock calls */
1515 down_write(sem: &nfsi->rwsem);
1516 spin_lock(lock: &flctx->flc_lock);
1517restart:
1518 for_each_file_lock(fl, list) {
1519 if (nfs_file_open_context(filp: fl->c.flc_file)->state != state)
1520 continue;
1521 spin_unlock(lock: &flctx->flc_lock);
1522 status = ops->recover_lock(state, fl);
1523 switch (status) {
1524 case 0:
1525 break;
1526 case -ETIMEDOUT:
1527 case -ESTALE:
1528 case -NFS4ERR_ADMIN_REVOKED:
1529 case -NFS4ERR_STALE_STATEID:
1530 case -NFS4ERR_BAD_STATEID:
1531 case -NFS4ERR_EXPIRED:
1532 case -NFS4ERR_NO_GRACE:
1533 case -NFS4ERR_STALE_CLIENTID:
1534 case -NFS4ERR_BADSESSION:
1535 case -NFS4ERR_BADSLOT:
1536 case -NFS4ERR_BAD_HIGH_SLOT:
1537 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1538 goto out;
1539 default:
1540 pr_err("NFS: %s: unhandled error %d\n",
1541 __func__, status);
1542 fallthrough;
1543 case -ENOMEM:
1544 case -NFS4ERR_DENIED:
1545 case -NFS4ERR_RECLAIM_BAD:
1546 case -NFS4ERR_RECLAIM_CONFLICT:
1547 lsp = fl->fl_u.nfs4_fl.owner;
1548 if (lsp)
1549 set_bit(NFS_LOCK_LOST, addr: &lsp->ls_flags);
1550 status = 0;
1551 }
1552 spin_lock(lock: &flctx->flc_lock);
1553 }
1554 if (list == &flctx->flc_posix) {
1555 list = &flctx->flc_flock;
1556 goto restart;
1557 }
1558 spin_unlock(lock: &flctx->flc_lock);
1559out:
1560 up_write(sem: &nfsi->rwsem);
1561 return status;
1562}
1563
1564#ifdef CONFIG_NFS_V4_2
1565static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1566{
1567 struct nfs4_copy_state *copy;
1568
1569 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1570 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1571 return;
1572
1573 spin_lock(&sp->so_server->nfs_client->cl_lock);
1574 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1575 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1576 !nfs4_stateid_match_other(&state->stateid,
1577 &copy->parent_dst_state->stateid)))
1578 continue;
1579 copy->flags = 1;
1580 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1581 &state->flags)) {
1582 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1583 complete(&copy->completion);
1584 }
1585 }
1586 list_for_each_entry(copy, &sp->so_server->ss_src_copies, src_copies) {
1587 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1588 !nfs4_stateid_match_other(&state->stateid,
1589 &copy->parent_src_state->stateid)))
1590 continue;
1591 copy->flags = 1;
1592 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1593 &state->flags))
1594 complete(&copy->completion);
1595 }
1596 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1597}
1598#else /* !CONFIG_NFS_V4_2 */
1599static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1600 struct nfs4_state *state)
1601{
1602}
1603#endif /* CONFIG_NFS_V4_2 */
1604
1605static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1606 const struct nfs4_state_recovery_ops *ops,
1607 int *lost_locks)
1608{
1609 struct nfs4_lock_state *lock;
1610 int status;
1611
1612 status = ops->recover_open(sp, state);
1613 if (status < 0)
1614 return status;
1615
1616 status = nfs4_reclaim_locks(state, ops);
1617 if (status < 0)
1618 return status;
1619
1620 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1621 spin_lock(lock: &state->state_lock);
1622 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1623 trace_nfs4_state_lock_reclaim(state, lock);
1624 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags) &&
1625 !test_bit(NFS_LOCK_UNLOCKING, &lock->ls_flags))
1626 *lost_locks += 1;
1627 }
1628 spin_unlock(lock: &state->state_lock);
1629 }
1630
1631 nfs42_complete_copies(sp, state);
1632 clear_bit(nr: NFS_STATE_RECLAIM_NOGRACE, addr: &state->flags);
1633 return status;
1634}
1635
1636static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp,
1637 const struct nfs4_state_recovery_ops *ops,
1638 int *lost_locks)
1639{
1640 struct nfs4_state *state;
1641 unsigned int loop = 0;
1642 int status = 0;
1643#ifdef CONFIG_NFS_V4_2
1644 bool found_ssc_copy_state = false;
1645#endif /* CONFIG_NFS_V4_2 */
1646
1647 /* Note: we rely on the sp->so_states list being ordered
1648 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1649 * states first.
1650 * This is needed to ensure that the server won't give us any
1651 * read delegations that we have to return if, say, we are
1652 * recovering after a network partition or a reboot from a
1653 * server that doesn't support a grace period.
1654 */
1655 spin_lock(lock: &sp->so_lock);
1656restart:
1657 list_for_each_entry(state, &sp->so_states, open_states) {
1658 if (!test_and_clear_bit(nr: ops->state_flag_bit, addr: &state->flags))
1659 continue;
1660 if (!nfs4_valid_open_stateid(state))
1661 continue;
1662 if (state->state == 0)
1663 continue;
1664#ifdef CONFIG_NFS_V4_2
1665 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1666 nfs4_state_mark_recovery_failed(state, -EIO);
1667 found_ssc_copy_state = true;
1668 continue;
1669 }
1670#endif /* CONFIG_NFS_V4_2 */
1671 refcount_inc(r: &state->count);
1672 spin_unlock(lock: &sp->so_lock);
1673 status = __nfs4_reclaim_open_state(sp, state, ops, lost_locks);
1674
1675 switch (status) {
1676 default:
1677 if (status >= 0) {
1678 loop = 0;
1679 break;
1680 }
1681 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1682 fallthrough;
1683 case -ENOENT:
1684 case -ENOMEM:
1685 case -EACCES:
1686 case -EROFS:
1687 case -EIO:
1688 case -ESTALE:
1689 /* Open state on this file cannot be recovered */
1690 nfs4_state_mark_recovery_failed(state, error: status);
1691 break;
1692 case -EAGAIN:
1693 ssleep(seconds: 1);
1694 if (loop++ < 10) {
1695 set_bit(nr: ops->state_flag_bit, addr: &state->flags);
1696 break;
1697 }
1698 fallthrough;
1699 case -NFS4ERR_ADMIN_REVOKED:
1700 case -NFS4ERR_STALE_STATEID:
1701 case -NFS4ERR_OLD_STATEID:
1702 case -NFS4ERR_BAD_STATEID:
1703 case -NFS4ERR_RECLAIM_BAD:
1704 case -NFS4ERR_RECLAIM_CONFLICT:
1705 nfs4_state_mark_reclaim_nograce(clp: sp->so_server->nfs_client, state);
1706 break;
1707 case -NFS4ERR_EXPIRED:
1708 case -NFS4ERR_NO_GRACE:
1709 nfs4_state_mark_reclaim_nograce(clp: sp->so_server->nfs_client, state);
1710 fallthrough;
1711 case -NFS4ERR_STALE_CLIENTID:
1712 case -NFS4ERR_BADSESSION:
1713 case -NFS4ERR_BADSLOT:
1714 case -NFS4ERR_BAD_HIGH_SLOT:
1715 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1716 case -ETIMEDOUT:
1717 goto out_err;
1718 }
1719 nfs4_put_open_state(state);
1720 spin_lock(lock: &sp->so_lock);
1721 goto restart;
1722 }
1723 spin_unlock(lock: &sp->so_lock);
1724#ifdef CONFIG_NFS_V4_2
1725 if (found_ssc_copy_state)
1726 return -EIO;
1727#endif /* CONFIG_NFS_V4_2 */
1728 return 0;
1729out_err:
1730 nfs4_put_open_state(state);
1731 spin_lock(lock: &sp->so_lock);
1732 spin_unlock(lock: &sp->so_lock);
1733 return status;
1734}
1735
1736static void nfs4_clear_open_state(struct nfs4_state *state)
1737{
1738 struct nfs4_lock_state *lock;
1739
1740 clear_bit(nr: NFS_DELEGATED_STATE, addr: &state->flags);
1741 clear_bit(nr: NFS_O_RDONLY_STATE, addr: &state->flags);
1742 clear_bit(nr: NFS_O_WRONLY_STATE, addr: &state->flags);
1743 clear_bit(nr: NFS_O_RDWR_STATE, addr: &state->flags);
1744 spin_lock(lock: &state->state_lock);
1745 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1746 lock->ls_seqid.flags = 0;
1747 clear_bit(NFS_LOCK_INITIALIZED, addr: &lock->ls_flags);
1748 }
1749 spin_unlock(lock: &state->state_lock);
1750}
1751
1752static void nfs4_reset_seqids(struct nfs_server *server,
1753 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1754{
1755 struct nfs_client *clp = server->nfs_client;
1756 struct nfs4_state_owner *sp;
1757 struct rb_node *pos;
1758 struct nfs4_state *state;
1759
1760 spin_lock(lock: &clp->cl_lock);
1761 for (pos = rb_first(&server->state_owners);
1762 pos != NULL;
1763 pos = rb_next(pos)) {
1764 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1765 sp->so_seqid.flags = 0;
1766 spin_lock(lock: &sp->so_lock);
1767 list_for_each_entry(state, &sp->so_states, open_states) {
1768 if (mark_reclaim(clp, state))
1769 nfs4_clear_open_state(state);
1770 }
1771 spin_unlock(lock: &sp->so_lock);
1772 }
1773 spin_unlock(lock: &clp->cl_lock);
1774}
1775
1776static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1777 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1778{
1779 struct nfs_server *server;
1780
1781 rcu_read_lock();
1782 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1783 nfs4_reset_seqids(server, mark_reclaim);
1784 rcu_read_unlock();
1785}
1786
1787static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1788{
1789 set_bit(nr: NFS4CLNT_RECLAIM_REBOOT, addr: &clp->cl_state);
1790 /* Mark all delegations for reclaim */
1791 nfs_delegation_mark_reclaim(clp);
1792 nfs4_state_mark_reclaim_helper(clp, mark_reclaim: nfs4_state_mark_reclaim_reboot);
1793}
1794
1795static int nfs4_reclaim_complete(struct nfs_client *clp,
1796 const struct nfs4_state_recovery_ops *ops,
1797 const struct cred *cred)
1798{
1799 /* Notify the server we're done reclaiming our state */
1800 if (ops->reclaim_complete)
1801 return ops->reclaim_complete(clp, cred);
1802 return 0;
1803}
1804
1805static void nfs4_clear_reclaim_server(struct nfs_server *server)
1806{
1807 struct nfs_client *clp = server->nfs_client;
1808 struct nfs4_state_owner *sp;
1809 struct rb_node *pos;
1810 struct nfs4_state *state;
1811
1812 spin_lock(lock: &clp->cl_lock);
1813 for (pos = rb_first(&server->state_owners);
1814 pos != NULL;
1815 pos = rb_next(pos)) {
1816 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1817 spin_lock(lock: &sp->so_lock);
1818 list_for_each_entry(state, &sp->so_states, open_states) {
1819 if (!test_and_clear_bit(nr: NFS_STATE_RECLAIM_REBOOT,
1820 addr: &state->flags))
1821 continue;
1822 nfs4_state_mark_reclaim_nograce(clp, state);
1823 }
1824 spin_unlock(lock: &sp->so_lock);
1825 }
1826 spin_unlock(lock: &clp->cl_lock);
1827}
1828
1829static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1830{
1831 struct nfs_server *server;
1832
1833 if (!test_and_clear_bit(nr: NFS4CLNT_RECLAIM_REBOOT, addr: &clp->cl_state))
1834 return 0;
1835
1836 rcu_read_lock();
1837 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1838 nfs4_clear_reclaim_server(server);
1839 rcu_read_unlock();
1840
1841 nfs_delegation_reap_unclaimed(clp);
1842 return 1;
1843}
1844
1845static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1846{
1847 const struct nfs4_state_recovery_ops *ops;
1848 const struct cred *cred;
1849 int err;
1850
1851 if (!nfs4_state_clear_reclaim_reboot(clp))
1852 return;
1853 pnfs_destroy_all_layouts(clp);
1854 ops = clp->cl_mvops->reboot_recovery_ops;
1855 cred = nfs4_get_clid_cred(clp);
1856 err = nfs4_reclaim_complete(clp, ops, cred);
1857 put_cred(cred);
1858 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1859 set_bit(nr: NFS4CLNT_RECLAIM_REBOOT, addr: &clp->cl_state);
1860}
1861
1862static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1863{
1864 nfs_mark_test_expired_all_delegations(clp);
1865 nfs4_state_mark_reclaim_helper(clp, mark_reclaim: nfs4_state_mark_reclaim_nograce);
1866}
1867
1868static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1869{
1870 switch (error) {
1871 case 0:
1872 break;
1873 case -NFS4ERR_CB_PATH_DOWN:
1874 nfs40_handle_cb_pathdown(clp);
1875 break;
1876 case -NFS4ERR_NO_GRACE:
1877 nfs4_state_end_reclaim_reboot(clp);
1878 break;
1879 case -NFS4ERR_STALE_CLIENTID:
1880 set_bit(nr: NFS4CLNT_LEASE_EXPIRED, addr: &clp->cl_state);
1881 nfs4_state_start_reclaim_reboot(clp);
1882 break;
1883 case -NFS4ERR_EXPIRED:
1884 set_bit(nr: NFS4CLNT_LEASE_EXPIRED, addr: &clp->cl_state);
1885 nfs4_state_start_reclaim_nograce(clp);
1886 break;
1887 case -NFS4ERR_BADSESSION:
1888 case -NFS4ERR_BADSLOT:
1889 case -NFS4ERR_BAD_HIGH_SLOT:
1890 case -NFS4ERR_DEADSESSION:
1891 case -NFS4ERR_SEQ_FALSE_RETRY:
1892 case -NFS4ERR_SEQ_MISORDERED:
1893 set_bit(nr: NFS4CLNT_SESSION_RESET, addr: &clp->cl_state);
1894 /* Zero session reset errors */
1895 break;
1896 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1897 set_bit(nr: NFS4CLNT_BIND_CONN_TO_SESSION, addr: &clp->cl_state);
1898 break;
1899 default:
1900 dprintk("%s: failed to handle error %d for server %s\n",
1901 __func__, error, clp->cl_hostname);
1902 return error;
1903 }
1904 dprintk("%s: handled error %d for server %s\n", __func__, error,
1905 clp->cl_hostname);
1906 return 0;
1907}
1908
1909static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1910{
1911 struct nfs4_state_owner *sp;
1912 struct nfs_server *server;
1913 struct rb_node *pos;
1914 LIST_HEAD(freeme);
1915 int lost_locks = 0;
1916 int status;
1917
1918 status = nfs4_begin_drain_session(clp);
1919 if (status < 0)
1920 return status;
1921restart:
1922 rcu_read_lock();
1923 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1924 nfs4_purge_state_owners(server, head: &freeme);
1925 spin_lock(lock: &clp->cl_lock);
1926 for (pos = rb_first(&server->state_owners);
1927 pos != NULL;
1928 pos = rb_next(pos)) {
1929 sp = rb_entry(pos,
1930 struct nfs4_state_owner, so_server_node);
1931 if (!test_and_clear_bit(nr: ops->owner_flag_bit,
1932 addr: &sp->so_flags))
1933 continue;
1934 if (!atomic_inc_not_zero(v: &sp->so_count))
1935 continue;
1936 spin_unlock(lock: &clp->cl_lock);
1937 rcu_read_unlock();
1938
1939 status = nfs4_reclaim_open_state(sp, ops, lost_locks: &lost_locks);
1940 if (status < 0) {
1941 if (lost_locks)
1942 pr_warn("NFS: %s: lost %d locks\n",
1943 clp->cl_hostname, lost_locks);
1944 set_bit(nr: ops->owner_flag_bit, addr: &sp->so_flags);
1945 nfs4_put_state_owner(sp);
1946 status = nfs4_recovery_handle_error(clp, error: status);
1947 nfs4_free_state_owners(head: &freeme);
1948 return (status != 0) ? status : -EAGAIN;
1949 }
1950
1951 nfs4_put_state_owner(sp);
1952 goto restart;
1953 }
1954 spin_unlock(lock: &clp->cl_lock);
1955 }
1956 rcu_read_unlock();
1957 nfs4_free_state_owners(head: &freeme);
1958 nfs_local_probe_async(clp);
1959 if (lost_locks)
1960 pr_warn("NFS: %s: lost %d locks\n",
1961 clp->cl_hostname, lost_locks);
1962 return 0;
1963}
1964
1965static int nfs4_check_lease(struct nfs_client *clp)
1966{
1967 const struct cred *cred;
1968 const struct nfs4_state_maintenance_ops *ops =
1969 clp->cl_mvops->state_renewal_ops;
1970 int status;
1971
1972 /* Is the client already known to have an expired lease? */
1973 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1974 return 0;
1975 cred = ops->get_state_renewal_cred(clp);
1976 if (cred == NULL) {
1977 cred = nfs4_get_clid_cred(clp);
1978 status = -ENOKEY;
1979 if (cred == NULL)
1980 goto out;
1981 }
1982 status = ops->renew_lease(clp, cred);
1983 put_cred(cred);
1984 if (status == -ETIMEDOUT) {
1985 set_bit(nr: NFS4CLNT_CHECK_LEASE, addr: &clp->cl_state);
1986 return 0;
1987 }
1988out:
1989 return nfs4_recovery_handle_error(clp, error: status);
1990}
1991
1992/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1993 * and for recoverable errors on EXCHANGE_ID for v4.1
1994 */
1995static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1996{
1997 switch (status) {
1998 case -NFS4ERR_SEQ_MISORDERED:
1999 if (test_and_set_bit(nr: NFS4CLNT_PURGE_STATE, addr: &clp->cl_state))
2000 return -ESERVERFAULT;
2001 /* Lease confirmation error: retry after purging the lease */
2002 ssleep(seconds: 1);
2003 clear_bit(nr: NFS4CLNT_LEASE_CONFIRM, addr: &clp->cl_state);
2004 break;
2005 case -NFS4ERR_STALE_CLIENTID:
2006 clear_bit(nr: NFS4CLNT_LEASE_CONFIRM, addr: &clp->cl_state);
2007 nfs4_state_start_reclaim_reboot(clp);
2008 break;
2009 case -NFS4ERR_CLID_INUSE:
2010 pr_err("NFS: Server %s reports our clientid is in use\n",
2011 clp->cl_hostname);
2012 nfs_mark_client_ready(clp, state: -EPERM);
2013 clear_bit(nr: NFS4CLNT_LEASE_CONFIRM, addr: &clp->cl_state);
2014 return -EPERM;
2015 case -ETIMEDOUT:
2016 if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
2017 nfs_mark_client_ready(clp, state: -EIO);
2018 return -EIO;
2019 }
2020 fallthrough;
2021 case -EACCES:
2022 case -NFS4ERR_DELAY:
2023 case -EAGAIN:
2024 ssleep(seconds: 1);
2025 break;
2026
2027 case -NFS4ERR_MINOR_VERS_MISMATCH:
2028 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2029 nfs_mark_client_ready(clp, state: -EPROTONOSUPPORT);
2030 dprintk("%s: exit with error %d for server %s\n",
2031 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2032 return -EPROTONOSUPPORT;
2033 case -ENOSPC:
2034 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2035 nfs_mark_client_ready(clp, state: -EIO);
2036 return -EIO;
2037 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2038 * in nfs4_exchange_id */
2039 default:
2040 dprintk("%s: exit with error %d for server %s\n", __func__,
2041 status, clp->cl_hostname);
2042 return status;
2043 }
2044 set_bit(nr: NFS4CLNT_LEASE_EXPIRED, addr: &clp->cl_state);
2045 dprintk("%s: handled error %d for server %s\n", __func__, status,
2046 clp->cl_hostname);
2047 return 0;
2048}
2049
2050static int nfs4_establish_lease(struct nfs_client *clp)
2051{
2052 const struct cred *cred;
2053 const struct nfs4_state_recovery_ops *ops =
2054 clp->cl_mvops->reboot_recovery_ops;
2055 int status;
2056
2057 status = nfs4_begin_drain_session(clp);
2058 if (status != 0)
2059 return status;
2060 cred = nfs4_get_clid_cred(clp);
2061 if (cred == NULL)
2062 return -ENOENT;
2063 status = ops->establish_clid(clp, cred);
2064 put_cred(cred);
2065 if (status != 0)
2066 return status;
2067 return 0;
2068}
2069
2070/*
2071 * Returns zero or a negative errno. NFS4ERR values are converted
2072 * to local errno values.
2073 */
2074static int nfs4_reclaim_lease(struct nfs_client *clp)
2075{
2076 int status;
2077
2078 status = nfs4_establish_lease(clp);
2079 if (status < 0)
2080 return nfs4_handle_reclaim_lease_error(clp, status);
2081 if (test_and_clear_bit(nr: NFS4CLNT_SERVER_SCOPE_MISMATCH, addr: &clp->cl_state))
2082 nfs4_state_start_reclaim_nograce(clp);
2083 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2084 set_bit(nr: NFS4CLNT_RECLAIM_REBOOT, addr: &clp->cl_state);
2085 clear_bit(nr: NFS4CLNT_CHECK_LEASE, addr: &clp->cl_state);
2086 clear_bit(nr: NFS4CLNT_LEASE_EXPIRED, addr: &clp->cl_state);
2087 return 0;
2088}
2089
2090static int nfs4_purge_lease(struct nfs_client *clp)
2091{
2092 int status;
2093
2094 status = nfs4_establish_lease(clp);
2095 if (status < 0)
2096 return nfs4_handle_reclaim_lease_error(clp, status);
2097 clear_bit(nr: NFS4CLNT_PURGE_STATE, addr: &clp->cl_state);
2098 set_bit(nr: NFS4CLNT_LEASE_EXPIRED, addr: &clp->cl_state);
2099 nfs4_state_start_reclaim_nograce(clp);
2100 return 0;
2101}
2102
2103/*
2104 * Try remote migration of one FSID from a source server to a
2105 * destination server. The source server provides a list of
2106 * potential destinations.
2107 *
2108 * Returns zero or a negative NFS4ERR status code.
2109 */
2110static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2111{
2112 struct nfs_client *clp = server->nfs_client;
2113 struct nfs4_fs_locations *locations = NULL;
2114 struct nfs_fattr *fattr;
2115 struct inode *inode;
2116 struct page *page;
2117 int status, result;
2118
2119 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2120 (unsigned long long)server->fsid.major,
2121 (unsigned long long)server->fsid.minor,
2122 clp->cl_hostname);
2123
2124 page = alloc_page(GFP_KERNEL);
2125 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2126 fattr = nfs_alloc_fattr();
2127 if (page == NULL || locations == NULL || fattr == NULL) {
2128 dprintk("<-- %s: no memory\n", __func__);
2129 result = 0;
2130 goto out;
2131 }
2132
2133 locations->fattr = fattr;
2134 inode = d_inode(dentry: server->super->s_root);
2135 result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
2136 page, cred);
2137 if (result) {
2138 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2139 __func__, result);
2140 goto out;
2141 }
2142
2143 result = -NFS4ERR_NXIO;
2144 if (!locations->nlocations)
2145 goto out;
2146
2147 if (!(locations->fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2148 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2149 __func__);
2150 goto out;
2151 }
2152
2153 status = nfs4_begin_drain_session(clp);
2154 if (status != 0) {
2155 result = status;
2156 goto out;
2157 }
2158
2159 status = nfs4_replace_transport(server, locations);
2160 if (status != 0) {
2161 dprintk("<-- %s: failed to replace transport: %d\n",
2162 __func__, status);
2163 goto out;
2164 }
2165
2166 result = 0;
2167 dprintk("<-- %s: migration succeeded\n", __func__);
2168
2169out:
2170 if (page != NULL)
2171 __free_page(page);
2172 if (locations != NULL)
2173 kfree(objp: locations->fattr);
2174 kfree(objp: locations);
2175 if (result) {
2176 pr_err("NFS: migration recovery failed (server %s)\n",
2177 clp->cl_hostname);
2178 set_bit(NFS_MIG_FAILED, addr: &server->mig_status);
2179 }
2180 return result;
2181}
2182
2183/*
2184 * Returns zero or a negative NFS4ERR status code.
2185 */
2186static int nfs4_handle_migration(struct nfs_client *clp)
2187{
2188 const struct nfs4_state_maintenance_ops *ops =
2189 clp->cl_mvops->state_renewal_ops;
2190 struct nfs_server *server;
2191 const struct cred *cred;
2192
2193 dprintk("%s: migration reported on \"%s\"\n", __func__,
2194 clp->cl_hostname);
2195
2196 cred = ops->get_state_renewal_cred(clp);
2197 if (cred == NULL)
2198 return -NFS4ERR_NOENT;
2199
2200 clp->cl_mig_gen++;
2201restart:
2202 rcu_read_lock();
2203 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2204 int status;
2205
2206 if (server->mig_gen == clp->cl_mig_gen)
2207 continue;
2208 server->mig_gen = clp->cl_mig_gen;
2209
2210 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2211 addr: &server->mig_status))
2212 continue;
2213
2214 rcu_read_unlock();
2215 status = nfs4_try_migration(server, cred);
2216 if (status < 0) {
2217 put_cred(cred);
2218 return status;
2219 }
2220 goto restart;
2221 }
2222 rcu_read_unlock();
2223 put_cred(cred);
2224 return 0;
2225}
2226
2227/*
2228 * Test each nfs_server on the clp's cl_superblocks list to see
2229 * if it's moved to another server. Stop when the server no longer
2230 * returns NFS4ERR_LEASE_MOVED.
2231 */
2232static int nfs4_handle_lease_moved(struct nfs_client *clp)
2233{
2234 const struct nfs4_state_maintenance_ops *ops =
2235 clp->cl_mvops->state_renewal_ops;
2236 struct nfs_server *server;
2237 const struct cred *cred;
2238
2239 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2240 clp->cl_hostname);
2241
2242 cred = ops->get_state_renewal_cred(clp);
2243 if (cred == NULL)
2244 return -NFS4ERR_NOENT;
2245
2246 clp->cl_mig_gen++;
2247restart:
2248 rcu_read_lock();
2249 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2250 struct inode *inode;
2251 int status;
2252
2253 if (server->mig_gen == clp->cl_mig_gen)
2254 continue;
2255 server->mig_gen = clp->cl_mig_gen;
2256
2257 rcu_read_unlock();
2258
2259 inode = d_inode(dentry: server->super->s_root);
2260 status = nfs4_proc_fsid_present(inode, cred);
2261 if (status != -NFS4ERR_MOVED)
2262 goto restart; /* wasn't this one */
2263 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2264 goto restart; /* there are more */
2265 goto out;
2266 }
2267 rcu_read_unlock();
2268
2269out:
2270 put_cred(cred);
2271 return 0;
2272}
2273
2274/**
2275 * nfs4_discover_server_trunking - Detect server IP address trunking
2276 *
2277 * @clp: nfs_client under test
2278 * @result: OUT: found nfs_client, or clp
2279 *
2280 * Returns zero or a negative errno. If zero is returned,
2281 * an nfs_client pointer is planted in "result".
2282 *
2283 * Note: since we are invoked in process context, and
2284 * not from inside the state manager, we cannot use
2285 * nfs4_handle_reclaim_lease_error().
2286 */
2287int nfs4_discover_server_trunking(struct nfs_client *clp,
2288 struct nfs_client **result)
2289{
2290 const struct nfs4_state_recovery_ops *ops =
2291 clp->cl_mvops->reboot_recovery_ops;
2292 struct rpc_clnt *clnt;
2293 const struct cred *cred;
2294 int i, status;
2295
2296 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2297
2298 clnt = clp->cl_rpcclient;
2299 i = 0;
2300
2301 mutex_lock(lock: &nfs_clid_init_mutex);
2302again:
2303 status = -ENOENT;
2304 cred = nfs4_get_clid_cred(clp);
2305 if (cred == NULL)
2306 goto out_unlock;
2307
2308 status = ops->detect_trunking(clp, result, cred);
2309 put_cred(cred);
2310 switch (status) {
2311 case 0:
2312 case -EINTR:
2313 case -ERESTARTSYS:
2314 break;
2315 case -ETIMEDOUT:
2316 if (clnt->cl_softrtry)
2317 break;
2318 fallthrough;
2319 case -NFS4ERR_DELAY:
2320 case -EAGAIN:
2321 ssleep(seconds: 1);
2322 fallthrough;
2323 case -NFS4ERR_STALE_CLIENTID:
2324 dprintk("NFS: %s after status %d, retrying\n",
2325 __func__, status);
2326 goto again;
2327 case -EACCES:
2328 if (i++ == 0) {
2329 nfs4_root_machine_cred(clp);
2330 goto again;
2331 }
2332 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2333 break;
2334 fallthrough;
2335 case -NFS4ERR_CLID_INUSE:
2336 case -NFS4ERR_WRONGSEC:
2337 /* No point in retrying if we already used RPC_AUTH_UNIX */
2338 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2339 status = -EPERM;
2340 break;
2341 }
2342 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2343 if (IS_ERR(ptr: clnt)) {
2344 status = PTR_ERR(ptr: clnt);
2345 break;
2346 }
2347 /* Note: this is safe because we haven't yet marked the
2348 * client as ready, so we are the only user of
2349 * clp->cl_rpcclient
2350 */
2351 clnt = xchg(&clp->cl_rpcclient, clnt);
2352 rpc_shutdown_client(clnt);
2353 clnt = clp->cl_rpcclient;
2354 goto again;
2355
2356 case -NFS4ERR_MINOR_VERS_MISMATCH:
2357 status = -EPROTONOSUPPORT;
2358 break;
2359
2360 case -EKEYEXPIRED:
2361 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2362 * in nfs4_exchange_id */
2363 status = -EKEYEXPIRED;
2364 break;
2365 default:
2366 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2367 __func__, status);
2368 status = -EIO;
2369 }
2370
2371out_unlock:
2372 mutex_unlock(lock: &nfs_clid_init_mutex);
2373 dprintk("NFS: %s: status = %d\n", __func__, status);
2374 return status;
2375}
2376
2377#ifdef CONFIG_NFS_V4_1
2378void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2379{
2380 struct nfs_client *clp = session->clp;
2381
2382 switch (err) {
2383 default:
2384 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2385 break;
2386 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2387 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2388 }
2389 nfs4_schedule_state_manager(clp);
2390}
2391EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2392
2393void nfs41_notify_server(struct nfs_client *clp)
2394{
2395 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2396 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2397 nfs4_schedule_state_manager(clp);
2398}
2399
2400static void nfs4_reset_all_state(struct nfs_client *clp)
2401{
2402 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2403 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2404 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2405 nfs4_state_start_reclaim_nograce(clp);
2406 dprintk("%s: scheduling reset of all state for server %s!\n",
2407 __func__, clp->cl_hostname);
2408 nfs4_schedule_state_manager(clp);
2409 }
2410}
2411
2412static void nfs41_handle_server_reboot(struct nfs_client *clp)
2413{
2414 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2415 nfs4_state_start_reclaim_reboot(clp);
2416 dprintk("%s: server %s rebooted!\n", __func__,
2417 clp->cl_hostname);
2418 nfs4_schedule_state_manager(clp);
2419 }
2420}
2421
2422static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2423{
2424 nfs4_reset_all_state(clp);
2425 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2426}
2427
2428static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2429{
2430 nfs4_state_start_reclaim_nograce(clp);
2431 nfs4_schedule_state_manager(clp);
2432
2433 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2434}
2435
2436static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2437{
2438 /* FIXME: For now, we destroy all layouts. */
2439 pnfs_destroy_all_layouts(clp);
2440 nfs_test_expired_all_delegations(clp);
2441 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2442 clp->cl_hostname);
2443}
2444
2445static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2446{
2447 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2448 nfs4_schedule_state_manager(clp);
2449
2450 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2451 clp->cl_hostname);
2452}
2453
2454static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2455{
2456 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2457 &clp->cl_state) == 0)
2458 nfs4_schedule_state_manager(clp);
2459}
2460
2461void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2462 bool recovery)
2463{
2464 if (!flags)
2465 return;
2466
2467 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2468 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2469 /*
2470 * If we're called from the state manager thread, then assume we're
2471 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2472 * Those flags are expected to remain set until we're done
2473 * recovering (see RFC5661, section 18.46.3).
2474 */
2475 if (recovery)
2476 goto out_recovery;
2477
2478 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2479 nfs41_handle_server_reboot(clp);
2480 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2481 nfs41_handle_all_state_revoked(clp);
2482 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2483 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2484 nfs41_handle_some_state_revoked(clp);
2485 if (flags & SEQ4_STATUS_LEASE_MOVED)
2486 nfs4_schedule_lease_moved_recovery(clp);
2487 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2488 nfs41_handle_recallable_state_revoked(clp);
2489out_recovery:
2490 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2491 nfs41_handle_backchannel_fault(clp);
2492 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2493 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2494 nfs41_handle_cb_path_down(clp);
2495}
2496
2497static int nfs4_reset_session(struct nfs_client *clp)
2498{
2499 const struct cred *cred;
2500 int status;
2501
2502 if (!nfs4_has_session(clp))
2503 return 0;
2504 status = nfs4_begin_drain_session(clp);
2505 if (status != 0)
2506 return status;
2507 cred = nfs4_get_clid_cred(clp);
2508 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2509 switch (status) {
2510 case 0:
2511 case -NFS4ERR_BADSESSION:
2512 case -NFS4ERR_DEADSESSION:
2513 break;
2514 case -NFS4ERR_BACK_CHAN_BUSY:
2515 case -NFS4ERR_DELAY:
2516 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2517 status = 0;
2518 ssleep(1);
2519 goto out;
2520 default:
2521 status = nfs4_recovery_handle_error(clp, status);
2522 goto out;
2523 }
2524
2525 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2526 status = nfs4_proc_create_session(clp, cred);
2527 if (status) {
2528 dprintk("%s: session reset failed with status %d for server %s!\n",
2529 __func__, status, clp->cl_hostname);
2530 status = nfs4_handle_reclaim_lease_error(clp, status);
2531 goto out;
2532 }
2533 nfs41_finish_session_reset(clp);
2534 dprintk("%s: session reset was successful for server %s!\n",
2535 __func__, clp->cl_hostname);
2536out:
2537 put_cred(cred);
2538 return status;
2539}
2540
2541static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2542{
2543 const struct cred *cred;
2544 int ret;
2545
2546 if (!nfs4_has_session(clp))
2547 return 0;
2548 ret = nfs4_begin_drain_session(clp);
2549 if (ret != 0)
2550 return ret;
2551 cred = nfs4_get_clid_cred(clp);
2552 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2553 put_cred(cred);
2554 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2555 switch (ret) {
2556 case 0:
2557 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2558 __func__, clp->cl_hostname);
2559 break;
2560 case -NFS4ERR_DELAY:
2561 ssleep(1);
2562 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2563 break;
2564 default:
2565 return nfs4_recovery_handle_error(clp, ret);
2566 }
2567 return 0;
2568}
2569
2570static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2571{
2572 int iomode = 0;
2573
2574 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2575 iomode += IOMODE_READ;
2576 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2577 iomode += IOMODE_RW;
2578 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2579 if (iomode) {
2580 pnfs_layout_return_unused_byclid(clp, iomode);
2581 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2582 }
2583}
2584#else /* CONFIG_NFS_V4_1 */
2585static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2586
2587static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2588{
2589 return 0;
2590}
2591
2592static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2593{
2594}
2595#endif /* CONFIG_NFS_V4_1 */
2596
2597static void nfs4_state_manager(struct nfs_client *clp)
2598{
2599 unsigned int memflags;
2600 int status = 0;
2601 const char *section = "", *section_sep = "";
2602
2603 /*
2604 * State recovery can deadlock if the direct reclaim code tries
2605 * start NFS writeback. So ensure memory allocations are all
2606 * GFP_NOFS.
2607 */
2608 memflags = memalloc_nofs_save();
2609
2610 /* Ensure exclusive access to NFSv4 state */
2611 do {
2612 trace_nfs4_state_mgr(clp);
2613 clear_bit(nr: NFS4CLNT_RUN_MANAGER, addr: &clp->cl_state);
2614 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2615 section = "purge state";
2616 status = nfs4_purge_lease(clp);
2617 if (status < 0)
2618 goto out_error;
2619 continue;
2620 }
2621
2622 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2623 section = "lease expired";
2624 /* We're going to have to re-establish a clientid */
2625 status = nfs4_reclaim_lease(clp);
2626 if (status < 0)
2627 goto out_error;
2628 continue;
2629 }
2630
2631 /* Initialize or reset the session */
2632 if (test_and_clear_bit(nr: NFS4CLNT_SESSION_RESET, addr: &clp->cl_state)) {
2633 section = "reset session";
2634 status = nfs4_reset_session(clp);
2635 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2636 continue;
2637 if (status < 0)
2638 goto out_error;
2639 }
2640
2641 /* Send BIND_CONN_TO_SESSION */
2642 if (test_and_clear_bit(nr: NFS4CLNT_BIND_CONN_TO_SESSION,
2643 addr: &clp->cl_state)) {
2644 section = "bind conn to session";
2645 status = nfs4_bind_conn_to_session(clp);
2646 if (status < 0)
2647 goto out_error;
2648 continue;
2649 }
2650
2651 if (test_and_clear_bit(nr: NFS4CLNT_CHECK_LEASE, addr: &clp->cl_state)) {
2652 section = "check lease";
2653 status = nfs4_check_lease(clp);
2654 if (status < 0)
2655 goto out_error;
2656 continue;
2657 }
2658
2659 if (test_and_clear_bit(nr: NFS4CLNT_MOVED, addr: &clp->cl_state)) {
2660 section = "migration";
2661 status = nfs4_handle_migration(clp);
2662 if (status < 0)
2663 goto out_error;
2664 }
2665
2666 if (test_and_clear_bit(nr: NFS4CLNT_LEASE_MOVED, addr: &clp->cl_state)) {
2667 section = "lease moved";
2668 status = nfs4_handle_lease_moved(clp);
2669 if (status < 0)
2670 goto out_error;
2671 }
2672
2673 /* First recover reboot state... */
2674 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2675 section = "reclaim reboot";
2676 status = nfs4_do_reclaim(clp,
2677 ops: clp->cl_mvops->reboot_recovery_ops);
2678 if (status == 0)
2679 status = pnfs_layout_handle_reboot(clp);
2680 if (status == -EAGAIN)
2681 continue;
2682 if (status < 0)
2683 goto out_error;
2684 nfs4_state_end_reclaim_reboot(clp);
2685 continue;
2686 }
2687
2688 /* Detect expired delegations... */
2689 if (test_and_clear_bit(nr: NFS4CLNT_DELEGATION_EXPIRED, addr: &clp->cl_state)) {
2690 section = "detect expired delegations";
2691 status = nfs4_begin_drain_session(clp);
2692 if (status < 0)
2693 goto out_error;
2694 nfs_reap_expired_delegations(clp);
2695 continue;
2696 }
2697
2698 /* Now recover expired state... */
2699 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2700 section = "reclaim nograce";
2701 status = nfs4_do_reclaim(clp,
2702 ops: clp->cl_mvops->nograce_recovery_ops);
2703 if (status == -EAGAIN)
2704 continue;
2705 if (status < 0)
2706 goto out_error;
2707 clear_bit(nr: NFS4CLNT_RECLAIM_NOGRACE, addr: &clp->cl_state);
2708 }
2709
2710 memalloc_nofs_restore(flags: memflags);
2711 nfs4_end_drain_session(clp);
2712 nfs4_clear_state_manager_bit(clp);
2713
2714 if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2715 !test_and_set_bit(nr: NFS4CLNT_MANAGER_RUNNING,
2716 addr: &clp->cl_state)) {
2717 memflags = memalloc_nofs_save();
2718 continue;
2719 }
2720
2721 if (!test_and_set_bit(nr: NFS4CLNT_RECALL_RUNNING, addr: &clp->cl_state)) {
2722 if (test_and_clear_bit(nr: NFS4CLNT_DELEGRETURN, addr: &clp->cl_state)) {
2723 nfs_client_return_marked_delegations(clp);
2724 set_bit(nr: NFS4CLNT_RUN_MANAGER, addr: &clp->cl_state);
2725 }
2726 nfs4_layoutreturn_any_run(clp);
2727 clear_bit(nr: NFS4CLNT_RECALL_RUNNING, addr: &clp->cl_state);
2728 }
2729
2730 return;
2731
2732 } while (refcount_read(r: &clp->cl_count) > 1 && !signalled());
2733 goto out_drain;
2734
2735out_error:
2736 if (strlen(section))
2737 section_sep = ": ";
2738 trace_nfs4_state_mgr_failed(clp, section, status);
2739 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2740 " with error %d\n", section_sep, section,
2741 clp->cl_hostname, -status);
2742 switch (status) {
2743 case -ENETDOWN:
2744 case -ENETUNREACH:
2745 nfs_mark_client_ready(clp, state: -EIO);
2746 break;
2747 case -EINVAL:
2748 nfs_mark_client_ready(clp, state: status);
2749 break;
2750 default:
2751 ssleep(seconds: 1);
2752 break;
2753 }
2754out_drain:
2755 memalloc_nofs_restore(flags: memflags);
2756 nfs4_end_drain_session(clp);
2757 nfs4_clear_state_manager_bit(clp);
2758}
2759
2760static int nfs4_run_state_manager(void *ptr)
2761{
2762 struct nfs_client *clp = ptr;
2763 struct rpc_clnt *cl = clp->cl_rpcclient;
2764
2765 while (cl != cl->cl_parent)
2766 cl = cl->cl_parent;
2767
2768 allow_signal(SIGKILL);
2769again:
2770 nfs4_state_manager(clp);
2771
2772 if (test_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) &&
2773 !test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state)) {
2774 wait_var_event_interruptible(&clp->cl_state,
2775 test_bit(NFS4CLNT_RUN_MANAGER,
2776 &clp->cl_state));
2777 if (!atomic_read(v: &cl->cl_swapper))
2778 clear_bit(nr: NFS4CLNT_MANAGER_AVAILABLE, addr: &clp->cl_state);
2779 if (refcount_read(r: &clp->cl_count) > 1 && !signalled() &&
2780 !test_and_set_bit(nr: NFS4CLNT_MANAGER_RUNNING, addr: &clp->cl_state))
2781 goto again;
2782 /* Either no longer a swapper, or were signalled */
2783 clear_bit(nr: NFS4CLNT_MANAGER_AVAILABLE, addr: &clp->cl_state);
2784 }
2785
2786 if (refcount_read(r: &clp->cl_count) > 1 && !signalled() &&
2787 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2788 !test_and_set_bit(nr: NFS4CLNT_MANAGER_RUNNING, addr: &clp->cl_state))
2789 goto again;
2790
2791 nfs_put_client(clp);
2792 module_put_and_kthread_exit(0);
2793 return 0;
2794}
2795