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
70 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp);
71
72 const nfs4_stateid zero_stateid = {
73 { .data = { 0 } },
74 .type = NFS4_SPECIAL_STATEID_TYPE,
75 };
76 const 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
84 const 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
92 static DEFINE_MUTEX(nfs_clid_init_mutex);
93
nfs4_setup_state_renewal(struct nfs_client * clp)94 static 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
nfs4_init_clientid(struct nfs_client * clp,const struct cred * cred)113 int 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);
135 do_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);
141 out:
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 */
nfs40_discover_server_trunking(struct nfs_client * clp,struct nfs_client ** result,const struct cred * cred)158 int 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 }
190 out:
191 return status;
192 }
193
nfs4_get_machine_cred(struct nfs_client * clp)194 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
195 {
196 return get_cred(rpc_machine_cred());
197 }
198
nfs4_root_machine_cred(struct nfs_client * clp)199 static 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
207 static const struct cred *
nfs4_get_renew_cred_server_locked(struct nfs_server * server)208 nfs4_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 */
nfs4_get_renew_cred(struct nfs_client * clp)233 const 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
253 out:
254 return cred;
255 }
256
nfs4_end_drain_slot_table(struct nfs4_slot_table * tbl)257 static 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
nfs4_end_drain_session(struct nfs_client * clp)266 static 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
nfs4_drain_slot_tbl(struct nfs4_slot_table * tbl)281 static 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
nfs4_begin_drain_session(struct nfs_client * clp)294 static 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
nfs41_finish_session_reset(struct nfs_client * clp)312 static 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
nfs41_init_clientid(struct nfs_client * clp,const struct cred * cred)321 int 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);
331 do_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);
339 out:
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 */
nfs41_discover_server_trunking(struct nfs_client * clp,struct nfs_client ** result,const struct cred * cred)356 int 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 */
nfs4_get_clid_cred(struct nfs_client * clp)398 const 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
406 static struct nfs4_state_owner *
nfs4_find_state_owner_locked(struct nfs_server * server,const struct cred * cred)407 nfs4_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
433 static struct nfs4_state_owner *
nfs4_insert_state_owner_locked(struct nfs4_state_owner * new)434 nfs4_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
463 static void
nfs4_remove_state_owner_locked(struct nfs4_state_owner * sp)464 nfs4_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
472 static void
nfs4_init_seqid_counter(struct nfs_seqid_counter * sc)473 nfs4_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
483 static void
nfs4_destroy_seqid_counter(struct nfs_seqid_counter * sc)484 nfs4_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 */
494 static struct nfs4_state_owner *
nfs4_alloc_state_owner(struct nfs_server * server,const struct cred * cred,gfp_t gfp_flags)495 nfs4_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_simple_get(&server->openowner_id, 0, 0,
505 gfp_flags);
506 if (sp->so_seqid.owner_id < 0) {
507 kfree(sp);
508 return NULL;
509 }
510 sp->so_server = server;
511 sp->so_cred = get_cred(cred);
512 spin_lock_init(&sp->so_lock);
513 INIT_LIST_HEAD(&sp->so_states);
514 nfs4_init_seqid_counter(&sp->so_seqid);
515 atomic_set(&sp->so_count, 1);
516 INIT_LIST_HEAD(&sp->so_lru);
517 seqcount_spinlock_init(&sp->so_reclaim_seqcount, &sp->so_lock);
518 mutex_init(&sp->so_delegreturn_mutex);
519 return sp;
520 }
521
522 static void
nfs4_reset_state_owner(struct nfs4_state_owner * sp)523 nfs4_reset_state_owner(struct nfs4_state_owner *sp)
524 {
525 /* This state_owner is no longer usable, but must
526 * remain in place so that state recovery can find it
527 * and the opens associated with it.
528 * It may also be used for new 'open' request to
529 * return a delegation to the server.
530 * So update the 'create_time' so that it looks like
531 * a new state_owner. This will cause the server to
532 * request an OPEN_CONFIRM to start a new sequence.
533 */
534 sp->so_seqid.create_time = ktime_get();
535 }
536
nfs4_free_state_owner(struct nfs4_state_owner * sp)537 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
538 {
539 nfs4_destroy_seqid_counter(&sp->so_seqid);
540 put_cred(sp->so_cred);
541 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
542 kfree(sp);
543 }
544
nfs4_gc_state_owners(struct nfs_server * server)545 static void nfs4_gc_state_owners(struct nfs_server *server)
546 {
547 struct nfs_client *clp = server->nfs_client;
548 struct nfs4_state_owner *sp, *tmp;
549 unsigned long time_min, time_max;
550 LIST_HEAD(doomed);
551
552 spin_lock(&clp->cl_lock);
553 time_max = jiffies;
554 time_min = (long)time_max - (long)clp->cl_lease_time;
555 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
556 /* NB: LRU is sorted so that oldest is at the head */
557 if (time_in_range(sp->so_expires, time_min, time_max))
558 break;
559 list_move(&sp->so_lru, &doomed);
560 nfs4_remove_state_owner_locked(sp);
561 }
562 spin_unlock(&clp->cl_lock);
563
564 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
565 list_del(&sp->so_lru);
566 nfs4_free_state_owner(sp);
567 }
568 }
569
570 /**
571 * nfs4_get_state_owner - Look up a state owner given a credential
572 * @server: nfs_server to search
573 * @cred: RPC credential to match
574 * @gfp_flags: allocation mode
575 *
576 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
577 */
nfs4_get_state_owner(struct nfs_server * server,const struct cred * cred,gfp_t gfp_flags)578 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
579 const struct cred *cred,
580 gfp_t gfp_flags)
581 {
582 struct nfs_client *clp = server->nfs_client;
583 struct nfs4_state_owner *sp, *new;
584
585 spin_lock(&clp->cl_lock);
586 sp = nfs4_find_state_owner_locked(server, cred);
587 spin_unlock(&clp->cl_lock);
588 if (sp != NULL)
589 goto out;
590 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
591 if (new == NULL)
592 goto out;
593 spin_lock(&clp->cl_lock);
594 sp = nfs4_insert_state_owner_locked(new);
595 spin_unlock(&clp->cl_lock);
596 if (sp != new)
597 nfs4_free_state_owner(new);
598 out:
599 nfs4_gc_state_owners(server);
600 return sp;
601 }
602
603 /**
604 * nfs4_put_state_owner - Release a nfs4_state_owner
605 * @sp: state owner data to release
606 *
607 * Note that we keep released state owners on an LRU
608 * list.
609 * This caches valid state owners so that they can be
610 * reused, to avoid the OPEN_CONFIRM on minor version 0.
611 * It also pins the uniquifier of dropped state owners for
612 * a while, to ensure that those state owner names are
613 * never reused.
614 */
nfs4_put_state_owner(struct nfs4_state_owner * sp)615 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
616 {
617 struct nfs_server *server = sp->so_server;
618 struct nfs_client *clp = server->nfs_client;
619
620 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
621 return;
622
623 sp->so_expires = jiffies;
624 list_add_tail(&sp->so_lru, &server->state_owners_lru);
625 spin_unlock(&clp->cl_lock);
626 }
627
628 /**
629 * nfs4_purge_state_owners - Release all cached state owners
630 * @server: nfs_server with cached state owners to release
631 * @head: resulting list of state owners
632 *
633 * Called at umount time. Remaining state owners will be on
634 * the LRU with ref count of zero.
635 * Note that the state owners are not freed, but are added
636 * to the list @head, which can later be used as an argument
637 * to nfs4_free_state_owners.
638 */
nfs4_purge_state_owners(struct nfs_server * server,struct list_head * head)639 void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
640 {
641 struct nfs_client *clp = server->nfs_client;
642 struct nfs4_state_owner *sp, *tmp;
643
644 spin_lock(&clp->cl_lock);
645 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
646 list_move(&sp->so_lru, head);
647 nfs4_remove_state_owner_locked(sp);
648 }
649 spin_unlock(&clp->cl_lock);
650 }
651
652 /**
653 * nfs4_purge_state_owners - Release all cached state owners
654 * @head: resulting list of state owners
655 *
656 * Frees a list of state owners that was generated by
657 * nfs4_purge_state_owners
658 */
nfs4_free_state_owners(struct list_head * head)659 void nfs4_free_state_owners(struct list_head *head)
660 {
661 struct nfs4_state_owner *sp, *tmp;
662
663 list_for_each_entry_safe(sp, tmp, head, so_lru) {
664 list_del(&sp->so_lru);
665 nfs4_free_state_owner(sp);
666 }
667 }
668
669 static struct nfs4_state *
nfs4_alloc_open_state(void)670 nfs4_alloc_open_state(void)
671 {
672 struct nfs4_state *state;
673
674 state = kzalloc(sizeof(*state), GFP_NOFS);
675 if (!state)
676 return NULL;
677 refcount_set(&state->count, 1);
678 INIT_LIST_HEAD(&state->lock_states);
679 spin_lock_init(&state->state_lock);
680 seqlock_init(&state->seqlock);
681 init_waitqueue_head(&state->waitq);
682 return state;
683 }
684
685 void
nfs4_state_set_mode_locked(struct nfs4_state * state,fmode_t fmode)686 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
687 {
688 if (state->state == fmode)
689 return;
690 /* NB! List reordering - see the reclaim code for why. */
691 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
692 if (fmode & FMODE_WRITE)
693 list_move(&state->open_states, &state->owner->so_states);
694 else
695 list_move_tail(&state->open_states, &state->owner->so_states);
696 }
697 state->state = fmode;
698 }
699
700 static struct nfs4_state *
__nfs4_find_state_byowner(struct inode * inode,struct nfs4_state_owner * owner)701 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
702 {
703 struct nfs_inode *nfsi = NFS_I(inode);
704 struct nfs4_state *state;
705
706 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
707 if (state->owner != owner)
708 continue;
709 if (!nfs4_valid_open_stateid(state))
710 continue;
711 if (refcount_inc_not_zero(&state->count))
712 return state;
713 }
714 return NULL;
715 }
716
717 static void
nfs4_free_open_state(struct nfs4_state * state)718 nfs4_free_open_state(struct nfs4_state *state)
719 {
720 kfree_rcu(state, rcu_head);
721 }
722
723 struct nfs4_state *
nfs4_get_open_state(struct inode * inode,struct nfs4_state_owner * owner)724 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
725 {
726 struct nfs4_state *state, *new;
727 struct nfs_inode *nfsi = NFS_I(inode);
728
729 rcu_read_lock();
730 state = __nfs4_find_state_byowner(inode, owner);
731 rcu_read_unlock();
732 if (state)
733 goto out;
734 new = nfs4_alloc_open_state();
735 spin_lock(&owner->so_lock);
736 spin_lock(&inode->i_lock);
737 state = __nfs4_find_state_byowner(inode, owner);
738 if (state == NULL && new != NULL) {
739 state = new;
740 state->owner = owner;
741 atomic_inc(&owner->so_count);
742 ihold(inode);
743 state->inode = inode;
744 list_add_rcu(&state->inode_states, &nfsi->open_states);
745 spin_unlock(&inode->i_lock);
746 /* Note: The reclaim code dictates that we add stateless
747 * and read-only stateids to the end of the list */
748 list_add_tail(&state->open_states, &owner->so_states);
749 spin_unlock(&owner->so_lock);
750 } else {
751 spin_unlock(&inode->i_lock);
752 spin_unlock(&owner->so_lock);
753 if (new)
754 nfs4_free_open_state(new);
755 }
756 out:
757 return state;
758 }
759
nfs4_put_open_state(struct nfs4_state * state)760 void nfs4_put_open_state(struct nfs4_state *state)
761 {
762 struct inode *inode = state->inode;
763 struct nfs4_state_owner *owner = state->owner;
764
765 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
766 return;
767 spin_lock(&inode->i_lock);
768 list_del_rcu(&state->inode_states);
769 list_del(&state->open_states);
770 spin_unlock(&inode->i_lock);
771 spin_unlock(&owner->so_lock);
772 nfs4_inode_return_delegation_on_close(inode);
773 iput(inode);
774 nfs4_free_open_state(state);
775 nfs4_put_state_owner(owner);
776 }
777
778 /*
779 * Close the current file.
780 */
__nfs4_close(struct nfs4_state * state,fmode_t fmode,gfp_t gfp_mask,int wait)781 static void __nfs4_close(struct nfs4_state *state,
782 fmode_t fmode, gfp_t gfp_mask, int wait)
783 {
784 struct nfs4_state_owner *owner = state->owner;
785 int call_close = 0;
786 fmode_t newstate;
787
788 atomic_inc(&owner->so_count);
789 /* Protect against nfs4_find_state() */
790 spin_lock(&owner->so_lock);
791 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
792 case FMODE_READ:
793 state->n_rdonly--;
794 break;
795 case FMODE_WRITE:
796 state->n_wronly--;
797 break;
798 case FMODE_READ|FMODE_WRITE:
799 state->n_rdwr--;
800 }
801 newstate = FMODE_READ|FMODE_WRITE;
802 if (state->n_rdwr == 0) {
803 if (state->n_rdonly == 0) {
804 newstate &= ~FMODE_READ;
805 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
806 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
807 }
808 if (state->n_wronly == 0) {
809 newstate &= ~FMODE_WRITE;
810 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
811 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
812 }
813 if (newstate == 0)
814 clear_bit(NFS_DELEGATED_STATE, &state->flags);
815 }
816 nfs4_state_set_mode_locked(state, newstate);
817 spin_unlock(&owner->so_lock);
818
819 if (!call_close) {
820 nfs4_put_open_state(state);
821 nfs4_put_state_owner(owner);
822 } else
823 nfs4_do_close(state, gfp_mask, wait);
824 }
825
nfs4_close_state(struct nfs4_state * state,fmode_t fmode)826 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
827 {
828 __nfs4_close(state, fmode, GFP_NOFS, 0);
829 }
830
nfs4_close_sync(struct nfs4_state * state,fmode_t fmode)831 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
832 {
833 __nfs4_close(state, fmode, GFP_KERNEL, 1);
834 }
835
836 /*
837 * Search the state->lock_states for an existing lock_owner
838 * that is compatible with either of the given owners.
839 * If the second is non-zero, then the first refers to a Posix-lock
840 * owner (current->files) and the second refers to a flock/OFD
841 * owner (struct file*). In that case, prefer a match for the first
842 * owner.
843 * If both sorts of locks are held on the one file we cannot know
844 * which stateid was intended to be used, so a "correct" choice cannot
845 * be made. Failing that, a "consistent" choice is preferable. The
846 * consistent choice we make is to prefer the first owner, that of a
847 * Posix lock.
848 */
849 static struct nfs4_lock_state *
__nfs4_find_lock_state(struct nfs4_state * state,fl_owner_t fl_owner,fl_owner_t fl_owner2)850 __nfs4_find_lock_state(struct nfs4_state *state,
851 fl_owner_t fl_owner, fl_owner_t fl_owner2)
852 {
853 struct nfs4_lock_state *pos, *ret = NULL;
854 list_for_each_entry(pos, &state->lock_states, ls_locks) {
855 if (pos->ls_owner == fl_owner) {
856 ret = pos;
857 break;
858 }
859 if (pos->ls_owner == fl_owner2)
860 ret = pos;
861 }
862 if (ret)
863 refcount_inc(&ret->ls_count);
864 return ret;
865 }
866
867 /*
868 * Return a compatible lock_state. If no initialized lock_state structure
869 * exists, return an uninitialized one.
870 *
871 */
nfs4_alloc_lock_state(struct nfs4_state * state,fl_owner_t fl_owner)872 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
873 {
874 struct nfs4_lock_state *lsp;
875 struct nfs_server *server = state->owner->so_server;
876
877 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
878 if (lsp == NULL)
879 return NULL;
880 nfs4_init_seqid_counter(&lsp->ls_seqid);
881 refcount_set(&lsp->ls_count, 1);
882 lsp->ls_state = state;
883 lsp->ls_owner = fl_owner;
884 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
885 if (lsp->ls_seqid.owner_id < 0)
886 goto out_free;
887 INIT_LIST_HEAD(&lsp->ls_locks);
888 return lsp;
889 out_free:
890 kfree(lsp);
891 return NULL;
892 }
893
nfs4_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)894 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
895 {
896 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
897 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
898 kfree(lsp);
899 }
900
901 /*
902 * Return a compatible lock_state. If no initialized lock_state structure
903 * exists, return an uninitialized one.
904 *
905 */
nfs4_get_lock_state(struct nfs4_state * state,fl_owner_t owner)906 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
907 {
908 struct nfs4_lock_state *lsp, *new = NULL;
909
910 for(;;) {
911 spin_lock(&state->state_lock);
912 lsp = __nfs4_find_lock_state(state, owner, NULL);
913 if (lsp != NULL)
914 break;
915 if (new != NULL) {
916 list_add(&new->ls_locks, &state->lock_states);
917 set_bit(LK_STATE_IN_USE, &state->flags);
918 lsp = new;
919 new = NULL;
920 break;
921 }
922 spin_unlock(&state->state_lock);
923 new = nfs4_alloc_lock_state(state, owner);
924 if (new == NULL)
925 return NULL;
926 }
927 spin_unlock(&state->state_lock);
928 if (new != NULL)
929 nfs4_free_lock_state(state->owner->so_server, new);
930 return lsp;
931 }
932
933 /*
934 * Release reference to lock_state, and free it if we see that
935 * it is no longer in use
936 */
nfs4_put_lock_state(struct nfs4_lock_state * lsp)937 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
938 {
939 struct nfs_server *server;
940 struct nfs4_state *state;
941
942 if (lsp == NULL)
943 return;
944 state = lsp->ls_state;
945 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
946 return;
947 list_del(&lsp->ls_locks);
948 if (list_empty(&state->lock_states))
949 clear_bit(LK_STATE_IN_USE, &state->flags);
950 spin_unlock(&state->state_lock);
951 server = state->owner->so_server;
952 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
953 struct nfs_client *clp = server->nfs_client;
954
955 clp->cl_mvops->free_lock_state(server, lsp);
956 } else
957 nfs4_free_lock_state(server, lsp);
958 }
959
nfs4_fl_copy_lock(struct file_lock * dst,struct file_lock * src)960 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
961 {
962 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
963
964 dst->fl_u.nfs4_fl.owner = lsp;
965 refcount_inc(&lsp->ls_count);
966 }
967
nfs4_fl_release_lock(struct file_lock * fl)968 static void nfs4_fl_release_lock(struct file_lock *fl)
969 {
970 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
971 }
972
973 static const struct file_lock_operations nfs4_fl_lock_ops = {
974 .fl_copy_lock = nfs4_fl_copy_lock,
975 .fl_release_private = nfs4_fl_release_lock,
976 };
977
nfs4_set_lock_state(struct nfs4_state * state,struct file_lock * fl)978 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
979 {
980 struct nfs4_lock_state *lsp;
981
982 if (fl->fl_ops != NULL)
983 return 0;
984 lsp = nfs4_get_lock_state(state, fl->fl_owner);
985 if (lsp == NULL)
986 return -ENOMEM;
987 fl->fl_u.nfs4_fl.owner = lsp;
988 fl->fl_ops = &nfs4_fl_lock_ops;
989 return 0;
990 }
991
nfs4_copy_lock_stateid(nfs4_stateid * dst,struct nfs4_state * state,const struct nfs_lock_context * l_ctx)992 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
993 struct nfs4_state *state,
994 const struct nfs_lock_context *l_ctx)
995 {
996 struct nfs4_lock_state *lsp;
997 fl_owner_t fl_owner, fl_flock_owner;
998 int ret = -ENOENT;
999
1000 if (l_ctx == NULL)
1001 goto out;
1002
1003 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1004 goto out;
1005
1006 fl_owner = l_ctx->lockowner;
1007 fl_flock_owner = l_ctx->open_context->flock_owner;
1008
1009 spin_lock(&state->state_lock);
1010 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
1011 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1012 ret = -EIO;
1013 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1014 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1015 ret = 0;
1016 }
1017 spin_unlock(&state->state_lock);
1018 nfs4_put_lock_state(lsp);
1019 out:
1020 return ret;
1021 }
1022
nfs4_copy_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)1023 bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1024 {
1025 bool ret;
1026 const nfs4_stateid *src;
1027 int seq;
1028
1029 do {
1030 ret = false;
1031 src = &zero_stateid;
1032 seq = read_seqbegin(&state->seqlock);
1033 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1034 src = &state->open_stateid;
1035 ret = true;
1036 }
1037 nfs4_stateid_copy(dst, src);
1038 } while (read_seqretry(&state->seqlock, seq));
1039 return ret;
1040 }
1041
1042 /*
1043 * Byte-range lock aware utility to initialize the stateid of read/write
1044 * requests.
1045 */
nfs4_select_rw_stateid(struct nfs4_state * state,fmode_t fmode,const struct nfs_lock_context * l_ctx,nfs4_stateid * dst,const struct cred ** cred)1046 int nfs4_select_rw_stateid(struct nfs4_state *state,
1047 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1048 nfs4_stateid *dst, const struct cred **cred)
1049 {
1050 int ret;
1051
1052 if (!nfs4_valid_open_stateid(state))
1053 return -EIO;
1054 if (cred != NULL)
1055 *cred = NULL;
1056 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1057 if (ret == -EIO)
1058 /* A lost lock - don't even consider delegations */
1059 goto out;
1060 /* returns true if delegation stateid found and copied */
1061 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1062 ret = 0;
1063 goto out;
1064 }
1065 if (ret != -ENOENT)
1066 /* nfs4_copy_delegation_stateid() didn't over-write
1067 * dst, so it still has the lock stateid which we now
1068 * choose to use.
1069 */
1070 goto out;
1071 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1072 out:
1073 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1074 dst->seqid = 0;
1075 return ret;
1076 }
1077
nfs_alloc_seqid(struct nfs_seqid_counter * counter,gfp_t gfp_mask)1078 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1079 {
1080 struct nfs_seqid *new;
1081
1082 new = kmalloc(sizeof(*new), gfp_mask);
1083 if (new == NULL)
1084 return ERR_PTR(-ENOMEM);
1085 new->sequence = counter;
1086 INIT_LIST_HEAD(&new->list);
1087 new->task = NULL;
1088 return new;
1089 }
1090
nfs_release_seqid(struct nfs_seqid * seqid)1091 void nfs_release_seqid(struct nfs_seqid *seqid)
1092 {
1093 struct nfs_seqid_counter *sequence;
1094
1095 if (seqid == NULL || list_empty(&seqid->list))
1096 return;
1097 sequence = seqid->sequence;
1098 spin_lock(&sequence->lock);
1099 list_del_init(&seqid->list);
1100 if (!list_empty(&sequence->list)) {
1101 struct nfs_seqid *next;
1102
1103 next = list_first_entry(&sequence->list,
1104 struct nfs_seqid, list);
1105 rpc_wake_up_queued_task(&sequence->wait, next->task);
1106 }
1107 spin_unlock(&sequence->lock);
1108 }
1109
nfs_free_seqid(struct nfs_seqid * seqid)1110 void nfs_free_seqid(struct nfs_seqid *seqid)
1111 {
1112 nfs_release_seqid(seqid);
1113 kfree(seqid);
1114 }
1115
1116 /*
1117 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1118 * failed with a seqid incrementing error -
1119 * see comments nfs4.h:seqid_mutating_error()
1120 */
nfs_increment_seqid(int status,struct nfs_seqid * seqid)1121 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1122 {
1123 switch (status) {
1124 case 0:
1125 break;
1126 case -NFS4ERR_BAD_SEQID:
1127 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1128 return;
1129 pr_warn_ratelimited("NFS: v4 server returned a bad"
1130 " sequence-id error on an"
1131 " unconfirmed sequence %p!\n",
1132 seqid->sequence);
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
nfs_increment_open_seqid(int status,struct nfs_seqid * seqid)1150 void 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 */
nfs_increment_lock_seqid(int status,struct nfs_seqid * seqid)1169 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1170 {
1171 if (seqid != NULL)
1172 nfs_increment_seqid(status, seqid);
1173 }
1174
nfs_wait_on_sequence(struct nfs_seqid * seqid,struct rpc_task * task)1175 int 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;
1191 unlock:
1192 spin_unlock(&sequence->lock);
1193 out:
1194 return status;
1195 }
1196
1197 static int nfs4_run_state_manager(void *);
1198
nfs4_clear_state_manager_bit(struct nfs_client * clp)1199 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1200 {
1201 smp_mb__before_atomic();
1202 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1203 smp_mb__after_atomic();
1204 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1205 rpc_wake_up(&clp->cl_rpcwaitq);
1206 }
1207
1208 /*
1209 * Schedule the nfs_client asynchronous state management routine
1210 */
nfs4_schedule_state_manager(struct nfs_client * clp)1211 void nfs4_schedule_state_manager(struct nfs_client *clp)
1212 {
1213 struct task_struct *task;
1214 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1215 struct rpc_clnt *clnt = clp->cl_rpcclient;
1216 bool swapon = false;
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 */
nfs4_schedule_lease_recovery(struct nfs_client * clp)1259 void 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 }
1269 EXPORT_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 */
nfs4_schedule_migration_recovery(const struct nfs_server * server)1279 int 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 }
1305 EXPORT_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 */
nfs4_schedule_lease_moved_recovery(struct nfs_client * clp)1313 void 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 }
1321 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1322
nfs4_wait_clnt_recover(struct nfs_client * clp)1323 int 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, TASK_KILLABLE);
1332 if (res)
1333 goto out;
1334 if (clp->cl_cons_state < 0)
1335 res = clp->cl_cons_state;
1336 out:
1337 nfs_put_client(clp);
1338 return res;
1339 }
1340
nfs4_client_recover_expired_lease(struct nfs_client * clp)1341 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1342 {
1343 unsigned int loop;
1344 int ret;
1345
1346 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1347 ret = nfs4_wait_clnt_recover(clp);
1348 if (ret != 0)
1349 break;
1350 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1351 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1352 break;
1353 nfs4_schedule_state_manager(clp);
1354 ret = -EIO;
1355 }
1356 return ret;
1357 }
1358
1359 /*
1360 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1361 * @clp: client to process
1362 *
1363 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1364 * resend of the SETCLIENTID and hence re-establish the
1365 * callback channel. Then return all existing delegations.
1366 */
nfs40_handle_cb_pathdown(struct nfs_client * clp)1367 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1368 {
1369 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1370 nfs_expire_all_delegations(clp);
1371 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1372 clp->cl_hostname);
1373 }
1374
nfs4_schedule_path_down_recovery(struct nfs_client * clp)1375 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1376 {
1377 nfs40_handle_cb_pathdown(clp);
1378 nfs4_schedule_state_manager(clp);
1379 }
1380
nfs4_state_mark_reclaim_reboot(struct nfs_client * clp,struct nfs4_state * state)1381 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1382 {
1383
1384 if (!nfs4_valid_open_stateid(state))
1385 return 0;
1386 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1387 /* Don't recover state that expired before the reboot */
1388 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1389 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1390 return 0;
1391 }
1392 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1393 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1394 return 1;
1395 }
1396
nfs4_state_mark_reclaim_nograce(struct nfs_client * clp,struct nfs4_state * state)1397 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1398 {
1399 if (!nfs4_valid_open_stateid(state))
1400 return 0;
1401 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1402 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1403 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1404 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1405 return 1;
1406 }
1407
nfs4_schedule_stateid_recovery(const struct nfs_server * server,struct nfs4_state * state)1408 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1409 {
1410 struct nfs_client *clp = server->nfs_client;
1411
1412 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1413 return -EBADF;
1414 nfs_inode_find_delegation_state_and_recover(state->inode,
1415 &state->stateid);
1416 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1417 clp->cl_hostname);
1418 nfs4_schedule_state_manager(clp);
1419 return 0;
1420 }
1421 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1422
1423 static struct nfs4_lock_state *
nfs_state_find_lock_state_by_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)1424 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1425 const nfs4_stateid *stateid)
1426 {
1427 struct nfs4_lock_state *pos;
1428
1429 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1430 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1431 continue;
1432 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1433 return pos;
1434 }
1435 return NULL;
1436 }
1437
nfs_state_lock_state_matches_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)1438 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1439 const nfs4_stateid *stateid)
1440 {
1441 bool found = false;
1442
1443 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1444 spin_lock(&state->state_lock);
1445 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1446 found = true;
1447 spin_unlock(&state->state_lock);
1448 }
1449 return found;
1450 }
1451
nfs_inode_find_state_and_recover(struct inode * inode,const nfs4_stateid * stateid)1452 void nfs_inode_find_state_and_recover(struct inode *inode,
1453 const nfs4_stateid *stateid)
1454 {
1455 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1456 struct nfs_inode *nfsi = NFS_I(inode);
1457 struct nfs_open_context *ctx;
1458 struct nfs4_state *state;
1459 bool found = false;
1460
1461 rcu_read_lock();
1462 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1463 state = ctx->state;
1464 if (state == NULL)
1465 continue;
1466 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1467 nfs4_state_mark_reclaim_nograce(clp, state)) {
1468 found = true;
1469 continue;
1470 }
1471 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1472 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
1473 nfs4_state_mark_reclaim_nograce(clp, state)) {
1474 found = true;
1475 continue;
1476 }
1477 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1478 nfs4_state_mark_reclaim_nograce(clp, state))
1479 found = true;
1480 }
1481 rcu_read_unlock();
1482
1483 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1484 if (found)
1485 nfs4_schedule_state_manager(clp);
1486 }
1487
nfs4_state_mark_open_context_bad(struct nfs4_state * state,int err)1488 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1489 {
1490 struct inode *inode = state->inode;
1491 struct nfs_inode *nfsi = NFS_I(inode);
1492 struct nfs_open_context *ctx;
1493
1494 rcu_read_lock();
1495 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1496 if (ctx->state != state)
1497 continue;
1498 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1499 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1500 "error = %d\n", ctx->dentry, err);
1501 }
1502 rcu_read_unlock();
1503 }
1504
nfs4_state_mark_recovery_failed(struct nfs4_state * state,int error)1505 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1506 {
1507 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1508 nfs4_state_mark_open_context_bad(state, error);
1509 }
1510
1511
nfs4_reclaim_locks(struct nfs4_state * state,const struct nfs4_state_recovery_ops * ops)1512 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1513 {
1514 struct inode *inode = state->inode;
1515 struct nfs_inode *nfsi = NFS_I(inode);
1516 struct file_lock *fl;
1517 struct nfs4_lock_state *lsp;
1518 int status = 0;
1519 struct file_lock_context *flctx = inode->i_flctx;
1520 struct list_head *list;
1521
1522 if (flctx == NULL)
1523 return 0;
1524
1525 list = &flctx->flc_posix;
1526
1527 /* Guard against delegation returns and new lock/unlock calls */
1528 down_write(&nfsi->rwsem);
1529 spin_lock(&flctx->flc_lock);
1530 restart:
1531 list_for_each_entry(fl, list, fl_list) {
1532 if (nfs_file_open_context(fl->fl_file)->state != state)
1533 continue;
1534 spin_unlock(&flctx->flc_lock);
1535 status = ops->recover_lock(state, fl);
1536 switch (status) {
1537 case 0:
1538 break;
1539 case -ETIMEDOUT:
1540 case -ESTALE:
1541 case -NFS4ERR_ADMIN_REVOKED:
1542 case -NFS4ERR_STALE_STATEID:
1543 case -NFS4ERR_BAD_STATEID:
1544 case -NFS4ERR_EXPIRED:
1545 case -NFS4ERR_NO_GRACE:
1546 case -NFS4ERR_STALE_CLIENTID:
1547 case -NFS4ERR_BADSESSION:
1548 case -NFS4ERR_BADSLOT:
1549 case -NFS4ERR_BAD_HIGH_SLOT:
1550 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1551 goto out;
1552 default:
1553 pr_err("NFS: %s: unhandled error %d\n",
1554 __func__, status);
1555 fallthrough;
1556 case -ENOMEM:
1557 case -NFS4ERR_DENIED:
1558 case -NFS4ERR_RECLAIM_BAD:
1559 case -NFS4ERR_RECLAIM_CONFLICT:
1560 lsp = fl->fl_u.nfs4_fl.owner;
1561 if (lsp)
1562 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1563 status = 0;
1564 }
1565 spin_lock(&flctx->flc_lock);
1566 }
1567 if (list == &flctx->flc_posix) {
1568 list = &flctx->flc_flock;
1569 goto restart;
1570 }
1571 spin_unlock(&flctx->flc_lock);
1572 out:
1573 up_write(&nfsi->rwsem);
1574 return status;
1575 }
1576
1577 #ifdef CONFIG_NFS_V4_2
nfs42_complete_copies(struct nfs4_state_owner * sp,struct nfs4_state * state)1578 static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1579 {
1580 struct nfs4_copy_state *copy;
1581
1582 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1583 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1584 return;
1585
1586 spin_lock(&sp->so_server->nfs_client->cl_lock);
1587 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1588 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1589 !nfs4_stateid_match_other(&state->stateid,
1590 ©->parent_dst_state->stateid)))
1591 continue;
1592 copy->flags = 1;
1593 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1594 &state->flags)) {
1595 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1596 complete(©->completion);
1597 }
1598 }
1599 list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
1600 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1601 !nfs4_stateid_match_other(&state->stateid,
1602 ©->parent_src_state->stateid)))
1603 continue;
1604 copy->flags = 1;
1605 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1606 &state->flags))
1607 complete(©->completion);
1608 }
1609 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1610 }
1611 #else /* !CONFIG_NFS_V4_2 */
nfs42_complete_copies(struct nfs4_state_owner * sp,struct nfs4_state * state)1612 static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1613 struct nfs4_state *state)
1614 {
1615 }
1616 #endif /* CONFIG_NFS_V4_2 */
1617
__nfs4_reclaim_open_state(struct nfs4_state_owner * sp,struct nfs4_state * state,const struct nfs4_state_recovery_ops * ops)1618 static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1619 const struct nfs4_state_recovery_ops *ops)
1620 {
1621 struct nfs4_lock_state *lock;
1622 int status;
1623
1624 status = ops->recover_open(sp, state);
1625 if (status < 0)
1626 return status;
1627
1628 status = nfs4_reclaim_locks(state, ops);
1629 if (status < 0)
1630 return status;
1631
1632 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1633 spin_lock(&state->state_lock);
1634 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1635 trace_nfs4_state_lock_reclaim(state, lock);
1636 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1637 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__);
1638 }
1639 spin_unlock(&state->state_lock);
1640 }
1641
1642 nfs42_complete_copies(sp, state);
1643 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1644 return status;
1645 }
1646
nfs4_reclaim_open_state(struct nfs4_state_owner * sp,const struct nfs4_state_recovery_ops * ops)1647 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1648 {
1649 struct nfs4_state *state;
1650 unsigned int loop = 0;
1651 int status = 0;
1652 #ifdef CONFIG_NFS_V4_2
1653 bool found_ssc_copy_state = false;
1654 #endif /* CONFIG_NFS_V4_2 */
1655
1656 /* Note: we rely on the sp->so_states list being ordered
1657 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1658 * states first.
1659 * This is needed to ensure that the server won't give us any
1660 * read delegations that we have to return if, say, we are
1661 * recovering after a network partition or a reboot from a
1662 * server that doesn't support a grace period.
1663 */
1664 spin_lock(&sp->so_lock);
1665 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1666 restart:
1667 list_for_each_entry(state, &sp->so_states, open_states) {
1668 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1669 continue;
1670 if (!nfs4_valid_open_stateid(state))
1671 continue;
1672 if (state->state == 0)
1673 continue;
1674 #ifdef CONFIG_NFS_V4_2
1675 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1676 nfs4_state_mark_recovery_failed(state, -EIO);
1677 found_ssc_copy_state = true;
1678 continue;
1679 }
1680 #endif /* CONFIG_NFS_V4_2 */
1681 refcount_inc(&state->count);
1682 spin_unlock(&sp->so_lock);
1683 status = __nfs4_reclaim_open_state(sp, state, ops);
1684
1685 switch (status) {
1686 default:
1687 if (status >= 0) {
1688 loop = 0;
1689 break;
1690 }
1691 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1692 fallthrough;
1693 case -ENOENT:
1694 case -ENOMEM:
1695 case -EACCES:
1696 case -EROFS:
1697 case -EIO:
1698 case -ESTALE:
1699 /* Open state on this file cannot be recovered */
1700 nfs4_state_mark_recovery_failed(state, status);
1701 break;
1702 case -EAGAIN:
1703 ssleep(1);
1704 if (loop++ < 10) {
1705 set_bit(ops->state_flag_bit, &state->flags);
1706 break;
1707 }
1708 fallthrough;
1709 case -NFS4ERR_ADMIN_REVOKED:
1710 case -NFS4ERR_STALE_STATEID:
1711 case -NFS4ERR_OLD_STATEID:
1712 case -NFS4ERR_BAD_STATEID:
1713 case -NFS4ERR_RECLAIM_BAD:
1714 case -NFS4ERR_RECLAIM_CONFLICT:
1715 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1716 break;
1717 case -NFS4ERR_EXPIRED:
1718 case -NFS4ERR_NO_GRACE:
1719 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1720 fallthrough;
1721 case -NFS4ERR_STALE_CLIENTID:
1722 case -NFS4ERR_BADSESSION:
1723 case -NFS4ERR_BADSLOT:
1724 case -NFS4ERR_BAD_HIGH_SLOT:
1725 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1726 case -ETIMEDOUT:
1727 goto out_err;
1728 }
1729 nfs4_put_open_state(state);
1730 spin_lock(&sp->so_lock);
1731 goto restart;
1732 }
1733 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1734 spin_unlock(&sp->so_lock);
1735 #ifdef CONFIG_NFS_V4_2
1736 if (found_ssc_copy_state)
1737 return -EIO;
1738 #endif /* CONFIG_NFS_V4_2 */
1739 return 0;
1740 out_err:
1741 nfs4_put_open_state(state);
1742 spin_lock(&sp->so_lock);
1743 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1744 spin_unlock(&sp->so_lock);
1745 return status;
1746 }
1747
nfs4_clear_open_state(struct nfs4_state * state)1748 static void nfs4_clear_open_state(struct nfs4_state *state)
1749 {
1750 struct nfs4_lock_state *lock;
1751
1752 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1753 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1754 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1755 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1756 spin_lock(&state->state_lock);
1757 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1758 lock->ls_seqid.flags = 0;
1759 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1760 }
1761 spin_unlock(&state->state_lock);
1762 }
1763
nfs4_reset_seqids(struct nfs_server * server,int (* mark_reclaim)(struct nfs_client * clp,struct nfs4_state * state))1764 static void nfs4_reset_seqids(struct nfs_server *server,
1765 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1766 {
1767 struct nfs_client *clp = server->nfs_client;
1768 struct nfs4_state_owner *sp;
1769 struct rb_node *pos;
1770 struct nfs4_state *state;
1771
1772 spin_lock(&clp->cl_lock);
1773 for (pos = rb_first(&server->state_owners);
1774 pos != NULL;
1775 pos = rb_next(pos)) {
1776 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1777 sp->so_seqid.flags = 0;
1778 spin_lock(&sp->so_lock);
1779 list_for_each_entry(state, &sp->so_states, open_states) {
1780 if (mark_reclaim(clp, state))
1781 nfs4_clear_open_state(state);
1782 }
1783 spin_unlock(&sp->so_lock);
1784 }
1785 spin_unlock(&clp->cl_lock);
1786 }
1787
nfs4_state_mark_reclaim_helper(struct nfs_client * clp,int (* mark_reclaim)(struct nfs_client * clp,struct nfs4_state * state))1788 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1789 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1790 {
1791 struct nfs_server *server;
1792
1793 rcu_read_lock();
1794 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1795 nfs4_reset_seqids(server, mark_reclaim);
1796 rcu_read_unlock();
1797 }
1798
nfs4_state_start_reclaim_reboot(struct nfs_client * clp)1799 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1800 {
1801 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1802 /* Mark all delegations for reclaim */
1803 nfs_delegation_mark_reclaim(clp);
1804 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1805 }
1806
nfs4_reclaim_complete(struct nfs_client * clp,const struct nfs4_state_recovery_ops * ops,const struct cred * cred)1807 static int nfs4_reclaim_complete(struct nfs_client *clp,
1808 const struct nfs4_state_recovery_ops *ops,
1809 const struct cred *cred)
1810 {
1811 /* Notify the server we're done reclaiming our state */
1812 if (ops->reclaim_complete)
1813 return ops->reclaim_complete(clp, cred);
1814 return 0;
1815 }
1816
nfs4_clear_reclaim_server(struct nfs_server * server)1817 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1818 {
1819 struct nfs_client *clp = server->nfs_client;
1820 struct nfs4_state_owner *sp;
1821 struct rb_node *pos;
1822 struct nfs4_state *state;
1823
1824 spin_lock(&clp->cl_lock);
1825 for (pos = rb_first(&server->state_owners);
1826 pos != NULL;
1827 pos = rb_next(pos)) {
1828 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1829 spin_lock(&sp->so_lock);
1830 list_for_each_entry(state, &sp->so_states, open_states) {
1831 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1832 &state->flags))
1833 continue;
1834 nfs4_state_mark_reclaim_nograce(clp, state);
1835 }
1836 spin_unlock(&sp->so_lock);
1837 }
1838 spin_unlock(&clp->cl_lock);
1839 }
1840
nfs4_state_clear_reclaim_reboot(struct nfs_client * clp)1841 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1842 {
1843 struct nfs_server *server;
1844
1845 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1846 return 0;
1847
1848 rcu_read_lock();
1849 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1850 nfs4_clear_reclaim_server(server);
1851 rcu_read_unlock();
1852
1853 nfs_delegation_reap_unclaimed(clp);
1854 return 1;
1855 }
1856
nfs4_state_end_reclaim_reboot(struct nfs_client * clp)1857 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1858 {
1859 const struct nfs4_state_recovery_ops *ops;
1860 const struct cred *cred;
1861 int err;
1862
1863 if (!nfs4_state_clear_reclaim_reboot(clp))
1864 return;
1865 ops = clp->cl_mvops->reboot_recovery_ops;
1866 cred = nfs4_get_clid_cred(clp);
1867 err = nfs4_reclaim_complete(clp, ops, cred);
1868 put_cred(cred);
1869 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1870 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1871 }
1872
nfs4_state_start_reclaim_nograce(struct nfs_client * clp)1873 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1874 {
1875 nfs_mark_test_expired_all_delegations(clp);
1876 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1877 }
1878
nfs4_recovery_handle_error(struct nfs_client * clp,int error)1879 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1880 {
1881 switch (error) {
1882 case 0:
1883 break;
1884 case -NFS4ERR_CB_PATH_DOWN:
1885 nfs40_handle_cb_pathdown(clp);
1886 break;
1887 case -NFS4ERR_NO_GRACE:
1888 nfs4_state_end_reclaim_reboot(clp);
1889 break;
1890 case -NFS4ERR_STALE_CLIENTID:
1891 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1892 nfs4_state_start_reclaim_reboot(clp);
1893 break;
1894 case -NFS4ERR_EXPIRED:
1895 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1896 nfs4_state_start_reclaim_nograce(clp);
1897 break;
1898 case -NFS4ERR_BADSESSION:
1899 case -NFS4ERR_BADSLOT:
1900 case -NFS4ERR_BAD_HIGH_SLOT:
1901 case -NFS4ERR_DEADSESSION:
1902 case -NFS4ERR_SEQ_FALSE_RETRY:
1903 case -NFS4ERR_SEQ_MISORDERED:
1904 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1905 /* Zero session reset errors */
1906 break;
1907 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1908 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1909 break;
1910 default:
1911 dprintk("%s: failed to handle error %d for server %s\n",
1912 __func__, error, clp->cl_hostname);
1913 return error;
1914 }
1915 dprintk("%s: handled error %d for server %s\n", __func__, error,
1916 clp->cl_hostname);
1917 return 0;
1918 }
1919
nfs4_do_reclaim(struct nfs_client * clp,const struct nfs4_state_recovery_ops * ops)1920 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1921 {
1922 struct nfs4_state_owner *sp;
1923 struct nfs_server *server;
1924 struct rb_node *pos;
1925 LIST_HEAD(freeme);
1926 int status = 0;
1927
1928 restart:
1929 rcu_read_lock();
1930 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1931 nfs4_purge_state_owners(server, &freeme);
1932 spin_lock(&clp->cl_lock);
1933 for (pos = rb_first(&server->state_owners);
1934 pos != NULL;
1935 pos = rb_next(pos)) {
1936 sp = rb_entry(pos,
1937 struct nfs4_state_owner, so_server_node);
1938 if (!test_and_clear_bit(ops->owner_flag_bit,
1939 &sp->so_flags))
1940 continue;
1941 if (!atomic_inc_not_zero(&sp->so_count))
1942 continue;
1943 spin_unlock(&clp->cl_lock);
1944 rcu_read_unlock();
1945
1946 status = nfs4_reclaim_open_state(sp, ops);
1947 if (status < 0) {
1948 set_bit(ops->owner_flag_bit, &sp->so_flags);
1949 nfs4_put_state_owner(sp);
1950 status = nfs4_recovery_handle_error(clp, status);
1951 return (status != 0) ? status : -EAGAIN;
1952 }
1953
1954 nfs4_put_state_owner(sp);
1955 goto restart;
1956 }
1957 spin_unlock(&clp->cl_lock);
1958 }
1959 rcu_read_unlock();
1960 nfs4_free_state_owners(&freeme);
1961 return 0;
1962 }
1963
nfs4_check_lease(struct nfs_client * clp)1964 static int nfs4_check_lease(struct nfs_client *clp)
1965 {
1966 const struct cred *cred;
1967 const struct nfs4_state_maintenance_ops *ops =
1968 clp->cl_mvops->state_renewal_ops;
1969 int status;
1970
1971 /* Is the client already known to have an expired lease? */
1972 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1973 return 0;
1974 cred = ops->get_state_renewal_cred(clp);
1975 if (cred == NULL) {
1976 cred = nfs4_get_clid_cred(clp);
1977 status = -ENOKEY;
1978 if (cred == NULL)
1979 goto out;
1980 }
1981 status = ops->renew_lease(clp, cred);
1982 put_cred(cred);
1983 if (status == -ETIMEDOUT) {
1984 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1985 return 0;
1986 }
1987 out:
1988 return nfs4_recovery_handle_error(clp, status);
1989 }
1990
1991 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1992 * and for recoverable errors on EXCHANGE_ID for v4.1
1993 */
nfs4_handle_reclaim_lease_error(struct nfs_client * clp,int status)1994 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1995 {
1996 switch (status) {
1997 case -NFS4ERR_SEQ_MISORDERED:
1998 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1999 return -ESERVERFAULT;
2000 /* Lease confirmation error: retry after purging the lease */
2001 ssleep(1);
2002 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2003 break;
2004 case -NFS4ERR_STALE_CLIENTID:
2005 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2006 nfs4_state_start_reclaim_reboot(clp);
2007 break;
2008 case -NFS4ERR_CLID_INUSE:
2009 pr_err("NFS: Server %s reports our clientid is in use\n",
2010 clp->cl_hostname);
2011 nfs_mark_client_ready(clp, -EPERM);
2012 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2013 return -EPERM;
2014 case -EACCES:
2015 case -NFS4ERR_DELAY:
2016 case -EAGAIN:
2017 ssleep(1);
2018 break;
2019
2020 case -NFS4ERR_MINOR_VERS_MISMATCH:
2021 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2022 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
2023 dprintk("%s: exit with error %d for server %s\n",
2024 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2025 return -EPROTONOSUPPORT;
2026 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2027 * in nfs4_exchange_id */
2028 default:
2029 dprintk("%s: exit with error %d for server %s\n", __func__,
2030 status, clp->cl_hostname);
2031 return status;
2032 }
2033 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2034 dprintk("%s: handled error %d for server %s\n", __func__, status,
2035 clp->cl_hostname);
2036 return 0;
2037 }
2038
nfs4_establish_lease(struct nfs_client * clp)2039 static int nfs4_establish_lease(struct nfs_client *clp)
2040 {
2041 const struct cred *cred;
2042 const struct nfs4_state_recovery_ops *ops =
2043 clp->cl_mvops->reboot_recovery_ops;
2044 int status;
2045
2046 status = nfs4_begin_drain_session(clp);
2047 if (status != 0)
2048 return status;
2049 cred = nfs4_get_clid_cred(clp);
2050 if (cred == NULL)
2051 return -ENOENT;
2052 status = ops->establish_clid(clp, cred);
2053 put_cred(cred);
2054 if (status != 0)
2055 return status;
2056 pnfs_destroy_all_layouts(clp);
2057 return 0;
2058 }
2059
2060 /*
2061 * Returns zero or a negative errno. NFS4ERR values are converted
2062 * to local errno values.
2063 */
nfs4_reclaim_lease(struct nfs_client * clp)2064 static int nfs4_reclaim_lease(struct nfs_client *clp)
2065 {
2066 int status;
2067
2068 status = nfs4_establish_lease(clp);
2069 if (status < 0)
2070 return nfs4_handle_reclaim_lease_error(clp, status);
2071 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2072 nfs4_state_start_reclaim_nograce(clp);
2073 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2074 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2075 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2076 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2077 return 0;
2078 }
2079
nfs4_purge_lease(struct nfs_client * clp)2080 static int nfs4_purge_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 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2088 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2089 nfs4_state_start_reclaim_nograce(clp);
2090 return 0;
2091 }
2092
2093 /*
2094 * Try remote migration of one FSID from a source server to a
2095 * destination server. The source server provides a list of
2096 * potential destinations.
2097 *
2098 * Returns zero or a negative NFS4ERR status code.
2099 */
nfs4_try_migration(struct nfs_server * server,const struct cred * cred)2100 static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2101 {
2102 struct nfs_client *clp = server->nfs_client;
2103 struct nfs4_fs_locations *locations = NULL;
2104 struct inode *inode;
2105 struct page *page;
2106 int status, result;
2107
2108 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2109 (unsigned long long)server->fsid.major,
2110 (unsigned long long)server->fsid.minor,
2111 clp->cl_hostname);
2112
2113 result = 0;
2114 page = alloc_page(GFP_KERNEL);
2115 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2116 if (page == NULL || locations == NULL) {
2117 dprintk("<-- %s: no memory\n", __func__);
2118 goto out;
2119 }
2120
2121 inode = d_inode(server->super->s_root);
2122 result = nfs4_proc_get_locations(inode, locations, page, cred);
2123 if (result) {
2124 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2125 __func__, result);
2126 goto out;
2127 }
2128
2129 result = -NFS4ERR_NXIO;
2130 if (!locations->nlocations)
2131 goto out;
2132
2133 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2134 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2135 __func__);
2136 goto out;
2137 }
2138
2139 status = nfs4_begin_drain_session(clp);
2140 if (status != 0) {
2141 result = status;
2142 goto out;
2143 }
2144
2145 status = nfs4_replace_transport(server, locations);
2146 if (status != 0) {
2147 dprintk("<-- %s: failed to replace transport: %d\n",
2148 __func__, status);
2149 goto out;
2150 }
2151
2152 result = 0;
2153 dprintk("<-- %s: migration succeeded\n", __func__);
2154
2155 out:
2156 if (page != NULL)
2157 __free_page(page);
2158 kfree(locations);
2159 if (result) {
2160 pr_err("NFS: migration recovery failed (server %s)\n",
2161 clp->cl_hostname);
2162 set_bit(NFS_MIG_FAILED, &server->mig_status);
2163 }
2164 return result;
2165 }
2166
2167 /*
2168 * Returns zero or a negative NFS4ERR status code.
2169 */
nfs4_handle_migration(struct nfs_client * clp)2170 static int nfs4_handle_migration(struct nfs_client *clp)
2171 {
2172 const struct nfs4_state_maintenance_ops *ops =
2173 clp->cl_mvops->state_renewal_ops;
2174 struct nfs_server *server;
2175 const struct cred *cred;
2176
2177 dprintk("%s: migration reported on \"%s\"\n", __func__,
2178 clp->cl_hostname);
2179
2180 cred = ops->get_state_renewal_cred(clp);
2181 if (cred == NULL)
2182 return -NFS4ERR_NOENT;
2183
2184 clp->cl_mig_gen++;
2185 restart:
2186 rcu_read_lock();
2187 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2188 int status;
2189
2190 if (server->mig_gen == clp->cl_mig_gen)
2191 continue;
2192 server->mig_gen = clp->cl_mig_gen;
2193
2194 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2195 &server->mig_status))
2196 continue;
2197
2198 rcu_read_unlock();
2199 status = nfs4_try_migration(server, cred);
2200 if (status < 0) {
2201 put_cred(cred);
2202 return status;
2203 }
2204 goto restart;
2205 }
2206 rcu_read_unlock();
2207 put_cred(cred);
2208 return 0;
2209 }
2210
2211 /*
2212 * Test each nfs_server on the clp's cl_superblocks list to see
2213 * if it's moved to another server. Stop when the server no longer
2214 * returns NFS4ERR_LEASE_MOVED.
2215 */
nfs4_handle_lease_moved(struct nfs_client * clp)2216 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2217 {
2218 const struct nfs4_state_maintenance_ops *ops =
2219 clp->cl_mvops->state_renewal_ops;
2220 struct nfs_server *server;
2221 const struct cred *cred;
2222
2223 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2224 clp->cl_hostname);
2225
2226 cred = ops->get_state_renewal_cred(clp);
2227 if (cred == NULL)
2228 return -NFS4ERR_NOENT;
2229
2230 clp->cl_mig_gen++;
2231 restart:
2232 rcu_read_lock();
2233 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2234 struct inode *inode;
2235 int status;
2236
2237 if (server->mig_gen == clp->cl_mig_gen)
2238 continue;
2239 server->mig_gen = clp->cl_mig_gen;
2240
2241 rcu_read_unlock();
2242
2243 inode = d_inode(server->super->s_root);
2244 status = nfs4_proc_fsid_present(inode, cred);
2245 if (status != -NFS4ERR_MOVED)
2246 goto restart; /* wasn't this one */
2247 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2248 goto restart; /* there are more */
2249 goto out;
2250 }
2251 rcu_read_unlock();
2252
2253 out:
2254 put_cred(cred);
2255 return 0;
2256 }
2257
2258 /**
2259 * nfs4_discover_server_trunking - Detect server IP address trunking
2260 *
2261 * @clp: nfs_client under test
2262 * @result: OUT: found nfs_client, or clp
2263 *
2264 * Returns zero or a negative errno. If zero is returned,
2265 * an nfs_client pointer is planted in "result".
2266 *
2267 * Note: since we are invoked in process context, and
2268 * not from inside the state manager, we cannot use
2269 * nfs4_handle_reclaim_lease_error().
2270 */
nfs4_discover_server_trunking(struct nfs_client * clp,struct nfs_client ** result)2271 int nfs4_discover_server_trunking(struct nfs_client *clp,
2272 struct nfs_client **result)
2273 {
2274 const struct nfs4_state_recovery_ops *ops =
2275 clp->cl_mvops->reboot_recovery_ops;
2276 struct rpc_clnt *clnt;
2277 const struct cred *cred;
2278 int i, status;
2279
2280 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2281
2282 clnt = clp->cl_rpcclient;
2283 i = 0;
2284
2285 mutex_lock(&nfs_clid_init_mutex);
2286 again:
2287 status = -ENOENT;
2288 cred = nfs4_get_clid_cred(clp);
2289 if (cred == NULL)
2290 goto out_unlock;
2291
2292 status = ops->detect_trunking(clp, result, cred);
2293 put_cred(cred);
2294 switch (status) {
2295 case 0:
2296 case -EINTR:
2297 case -ERESTARTSYS:
2298 break;
2299 case -ETIMEDOUT:
2300 if (clnt->cl_softrtry)
2301 break;
2302 fallthrough;
2303 case -NFS4ERR_DELAY:
2304 case -EAGAIN:
2305 ssleep(1);
2306 fallthrough;
2307 case -NFS4ERR_STALE_CLIENTID:
2308 dprintk("NFS: %s after status %d, retrying\n",
2309 __func__, status);
2310 goto again;
2311 case -EACCES:
2312 if (i++ == 0) {
2313 nfs4_root_machine_cred(clp);
2314 goto again;
2315 }
2316 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2317 break;
2318 fallthrough;
2319 case -NFS4ERR_CLID_INUSE:
2320 case -NFS4ERR_WRONGSEC:
2321 /* No point in retrying if we already used RPC_AUTH_UNIX */
2322 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2323 status = -EPERM;
2324 break;
2325 }
2326 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2327 if (IS_ERR(clnt)) {
2328 status = PTR_ERR(clnt);
2329 break;
2330 }
2331 /* Note: this is safe because we haven't yet marked the
2332 * client as ready, so we are the only user of
2333 * clp->cl_rpcclient
2334 */
2335 clnt = xchg(&clp->cl_rpcclient, clnt);
2336 rpc_shutdown_client(clnt);
2337 clnt = clp->cl_rpcclient;
2338 goto again;
2339
2340 case -NFS4ERR_MINOR_VERS_MISMATCH:
2341 status = -EPROTONOSUPPORT;
2342 break;
2343
2344 case -EKEYEXPIRED:
2345 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2346 * in nfs4_exchange_id */
2347 status = -EKEYEXPIRED;
2348 break;
2349 default:
2350 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2351 __func__, status);
2352 status = -EIO;
2353 }
2354
2355 out_unlock:
2356 mutex_unlock(&nfs_clid_init_mutex);
2357 dprintk("NFS: %s: status = %d\n", __func__, status);
2358 return status;
2359 }
2360
2361 #ifdef CONFIG_NFS_V4_1
nfs4_schedule_session_recovery(struct nfs4_session * session,int err)2362 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2363 {
2364 struct nfs_client *clp = session->clp;
2365
2366 switch (err) {
2367 default:
2368 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2369 break;
2370 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2371 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2372 }
2373 nfs4_schedule_state_manager(clp);
2374 }
2375 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2376
nfs41_notify_server(struct nfs_client * clp)2377 void nfs41_notify_server(struct nfs_client *clp)
2378 {
2379 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2380 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2381 nfs4_schedule_state_manager(clp);
2382 }
2383
nfs4_reset_all_state(struct nfs_client * clp)2384 static void nfs4_reset_all_state(struct nfs_client *clp)
2385 {
2386 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2387 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2388 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2389 nfs4_state_start_reclaim_nograce(clp);
2390 dprintk("%s: scheduling reset of all state for server %s!\n",
2391 __func__, clp->cl_hostname);
2392 nfs4_schedule_state_manager(clp);
2393 }
2394 }
2395
nfs41_handle_server_reboot(struct nfs_client * clp)2396 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2397 {
2398 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2399 nfs4_state_start_reclaim_reboot(clp);
2400 dprintk("%s: server %s rebooted!\n", __func__,
2401 clp->cl_hostname);
2402 nfs4_schedule_state_manager(clp);
2403 }
2404 }
2405
nfs41_handle_all_state_revoked(struct nfs_client * clp)2406 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2407 {
2408 nfs4_reset_all_state(clp);
2409 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2410 }
2411
nfs41_handle_some_state_revoked(struct nfs_client * clp)2412 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2413 {
2414 nfs4_state_start_reclaim_nograce(clp);
2415 nfs4_schedule_state_manager(clp);
2416
2417 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2418 }
2419
nfs41_handle_recallable_state_revoked(struct nfs_client * clp)2420 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2421 {
2422 /* FIXME: For now, we destroy all layouts. */
2423 pnfs_destroy_all_layouts(clp);
2424 nfs_test_expired_all_delegations(clp);
2425 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2426 clp->cl_hostname);
2427 }
2428
nfs41_handle_backchannel_fault(struct nfs_client * clp)2429 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2430 {
2431 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2432 nfs4_schedule_state_manager(clp);
2433
2434 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2435 clp->cl_hostname);
2436 }
2437
nfs41_handle_cb_path_down(struct nfs_client * clp)2438 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2439 {
2440 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2441 &clp->cl_state) == 0)
2442 nfs4_schedule_state_manager(clp);
2443 }
2444
nfs41_handle_sequence_flag_errors(struct nfs_client * clp,u32 flags,bool recovery)2445 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2446 bool recovery)
2447 {
2448 if (!flags)
2449 return;
2450
2451 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2452 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2453 /*
2454 * If we're called from the state manager thread, then assume we're
2455 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2456 * Those flags are expected to remain set until we're done
2457 * recovering (see RFC5661, section 18.46.3).
2458 */
2459 if (recovery)
2460 goto out_recovery;
2461
2462 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2463 nfs41_handle_server_reboot(clp);
2464 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2465 nfs41_handle_all_state_revoked(clp);
2466 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2467 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2468 nfs41_handle_some_state_revoked(clp);
2469 if (flags & SEQ4_STATUS_LEASE_MOVED)
2470 nfs4_schedule_lease_moved_recovery(clp);
2471 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2472 nfs41_handle_recallable_state_revoked(clp);
2473 out_recovery:
2474 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2475 nfs41_handle_backchannel_fault(clp);
2476 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2477 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2478 nfs41_handle_cb_path_down(clp);
2479 }
2480
nfs4_reset_session(struct nfs_client * clp)2481 static int nfs4_reset_session(struct nfs_client *clp)
2482 {
2483 const struct cred *cred;
2484 int status;
2485
2486 if (!nfs4_has_session(clp))
2487 return 0;
2488 status = nfs4_begin_drain_session(clp);
2489 if (status != 0)
2490 return status;
2491 cred = nfs4_get_clid_cred(clp);
2492 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2493 switch (status) {
2494 case 0:
2495 case -NFS4ERR_BADSESSION:
2496 case -NFS4ERR_DEADSESSION:
2497 break;
2498 case -NFS4ERR_BACK_CHAN_BUSY:
2499 case -NFS4ERR_DELAY:
2500 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2501 status = 0;
2502 ssleep(1);
2503 goto out;
2504 default:
2505 status = nfs4_recovery_handle_error(clp, status);
2506 goto out;
2507 }
2508
2509 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2510 status = nfs4_proc_create_session(clp, cred);
2511 if (status) {
2512 dprintk("%s: session reset failed with status %d for server %s!\n",
2513 __func__, status, clp->cl_hostname);
2514 status = nfs4_handle_reclaim_lease_error(clp, status);
2515 goto out;
2516 }
2517 nfs41_finish_session_reset(clp);
2518 dprintk("%s: session reset was successful for server %s!\n",
2519 __func__, clp->cl_hostname);
2520 out:
2521 put_cred(cred);
2522 return status;
2523 }
2524
nfs4_bind_conn_to_session(struct nfs_client * clp)2525 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2526 {
2527 const struct cred *cred;
2528 int ret;
2529
2530 if (!nfs4_has_session(clp))
2531 return 0;
2532 ret = nfs4_begin_drain_session(clp);
2533 if (ret != 0)
2534 return ret;
2535 cred = nfs4_get_clid_cred(clp);
2536 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2537 put_cred(cred);
2538 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2539 switch (ret) {
2540 case 0:
2541 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2542 __func__, clp->cl_hostname);
2543 break;
2544 case -NFS4ERR_DELAY:
2545 ssleep(1);
2546 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2547 break;
2548 default:
2549 return nfs4_recovery_handle_error(clp, ret);
2550 }
2551 return 0;
2552 }
2553
nfs4_layoutreturn_any_run(struct nfs_client * clp)2554 static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2555 {
2556 int iomode = 0;
2557
2558 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2559 iomode += IOMODE_READ;
2560 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2561 iomode += IOMODE_RW;
2562 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2563 if (iomode) {
2564 pnfs_layout_return_unused_byclid(clp, iomode);
2565 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2566 }
2567 }
2568 #else /* CONFIG_NFS_V4_1 */
nfs4_reset_session(struct nfs_client * clp)2569 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2570
nfs4_bind_conn_to_session(struct nfs_client * clp)2571 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2572 {
2573 return 0;
2574 }
2575
nfs4_layoutreturn_any_run(struct nfs_client * clp)2576 static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2577 {
2578 }
2579 #endif /* CONFIG_NFS_V4_1 */
2580
nfs4_state_manager(struct nfs_client * clp)2581 static void nfs4_state_manager(struct nfs_client *clp)
2582 {
2583 unsigned int memflags;
2584 int status = 0;
2585 const char *section = "", *section_sep = "";
2586
2587 /*
2588 * State recovery can deadlock if the direct reclaim code tries
2589 * start NFS writeback. So ensure memory allocations are all
2590 * GFP_NOFS.
2591 */
2592 memflags = memalloc_nofs_save();
2593
2594 /* Ensure exclusive access to NFSv4 state */
2595 do {
2596 trace_nfs4_state_mgr(clp);
2597 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2598 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2599 section = "purge state";
2600 status = nfs4_purge_lease(clp);
2601 if (status < 0)
2602 goto out_error;
2603 continue;
2604 }
2605
2606 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2607 section = "lease expired";
2608 /* We're going to have to re-establish a clientid */
2609 status = nfs4_reclaim_lease(clp);
2610 if (status < 0)
2611 goto out_error;
2612 continue;
2613 }
2614
2615 /* Initialize or reset the session */
2616 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2617 section = "reset session";
2618 status = nfs4_reset_session(clp);
2619 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2620 continue;
2621 if (status < 0)
2622 goto out_error;
2623 }
2624
2625 /* Send BIND_CONN_TO_SESSION */
2626 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2627 &clp->cl_state)) {
2628 section = "bind conn to session";
2629 status = nfs4_bind_conn_to_session(clp);
2630 if (status < 0)
2631 goto out_error;
2632 continue;
2633 }
2634
2635 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2636 section = "check lease";
2637 status = nfs4_check_lease(clp);
2638 if (status < 0)
2639 goto out_error;
2640 continue;
2641 }
2642
2643 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2644 section = "migration";
2645 status = nfs4_handle_migration(clp);
2646 if (status < 0)
2647 goto out_error;
2648 }
2649
2650 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2651 section = "lease moved";
2652 status = nfs4_handle_lease_moved(clp);
2653 if (status < 0)
2654 goto out_error;
2655 }
2656
2657 /* First recover reboot state... */
2658 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2659 section = "reclaim reboot";
2660 status = nfs4_do_reclaim(clp,
2661 clp->cl_mvops->reboot_recovery_ops);
2662 if (status == -EAGAIN)
2663 continue;
2664 if (status < 0)
2665 goto out_error;
2666 nfs4_state_end_reclaim_reboot(clp);
2667 continue;
2668 }
2669
2670 /* Detect expired delegations... */
2671 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2672 section = "detect expired delegations";
2673 nfs_reap_expired_delegations(clp);
2674 continue;
2675 }
2676
2677 /* Now recover expired state... */
2678 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2679 section = "reclaim nograce";
2680 status = nfs4_do_reclaim(clp,
2681 clp->cl_mvops->nograce_recovery_ops);
2682 if (status == -EAGAIN)
2683 continue;
2684 if (status < 0)
2685 goto out_error;
2686 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2687 }
2688
2689 memalloc_nofs_restore(memflags);
2690 nfs4_end_drain_session(clp);
2691 nfs4_clear_state_manager_bit(clp);
2692
2693 if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2694 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING,
2695 &clp->cl_state)) {
2696 memflags = memalloc_nofs_save();
2697 continue;
2698 }
2699
2700 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
2701 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2702 nfs_client_return_marked_delegations(clp);
2703 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2704 }
2705 nfs4_layoutreturn_any_run(clp);
2706 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
2707 }
2708
2709 return;
2710
2711 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2712 goto out_drain;
2713
2714 out_error:
2715 if (strlen(section))
2716 section_sep = ": ";
2717 trace_nfs4_state_mgr_failed(clp, section, status);
2718 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2719 " with error %d\n", section_sep, section,
2720 clp->cl_hostname, -status);
2721 ssleep(1);
2722 out_drain:
2723 memalloc_nofs_restore(memflags);
2724 nfs4_end_drain_session(clp);
2725 nfs4_clear_state_manager_bit(clp);
2726 }
2727
nfs4_run_state_manager(void * ptr)2728 static int nfs4_run_state_manager(void *ptr)
2729 {
2730 struct nfs_client *clp = ptr;
2731 struct rpc_clnt *cl = clp->cl_rpcclient;
2732
2733 while (cl != cl->cl_parent)
2734 cl = cl->cl_parent;
2735
2736 allow_signal(SIGKILL);
2737 again:
2738 nfs4_state_manager(clp);
2739
2740 if (test_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) &&
2741 !test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state)) {
2742 wait_var_event_interruptible(&clp->cl_state,
2743 test_bit(NFS4CLNT_RUN_MANAGER,
2744 &clp->cl_state));
2745 if (!atomic_read(&cl->cl_swapper))
2746 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2747 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2748 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2749 goto again;
2750 /* Either no longer a swapper, or were signalled */
2751 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2752 }
2753
2754 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2755 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2756 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2757 goto again;
2758
2759 nfs_put_client(clp);
2760 module_put_and_exit(0);
2761 return 0;
2762 }
2763
2764 /*
2765 * Local variables:
2766 * c-basic-offset: 8
2767 * End:
2768 */
2769