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drm/nouveau: add missing pll_calc calls
[linux-2.6/libata-dev.git] / fs / nfs / nfs4state.c
blobc351e6b398388f7c1b4b09a6240d4ad6c2559295
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/nfs_idmap.h>
46 #include <linux/kthread.h>
47 #include <linux/module.h>
48 #include <linux/random.h>
49 #include <linux/ratelimit.h>
50 #include <linux/workqueue.h>
51 #include <linux/bitops.h>
52 #include <linux/jiffies.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 "pnfs.h"
61 #include "netns.h"
62
63 #define NFSDBG_FACILITY NFSDBG_STATE
64
65 #define OPENOWNER_POOL_SIZE 8
66
67 const nfs4_stateid zero_stateid;
68 static DEFINE_MUTEX(nfs_clid_init_mutex);
69 static LIST_HEAD(nfs4_clientid_list);
70
71 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
72 {
73 struct nfs4_setclientid_res clid = {
74 .clientid = clp->cl_clientid,
75 .confirm = clp->cl_confirm,
76 };
77 unsigned short port;
78 int status;
79 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
80
81 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
82 goto do_confirm;
83 port = nn->nfs_callback_tcpport;
84 if (clp->cl_addr.ss_family == AF_INET6)
85 port = nn->nfs_callback_tcpport6;
86
87 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
88 if (status != 0)
89 goto out;
90 clp->cl_clientid = clid.clientid;
91 clp->cl_confirm = clid.confirm;
92 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
93 do_confirm:
94 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
95 if (status != 0)
96 goto out;
97 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
98 nfs4_schedule_state_renewal(clp);
99 out:
100 return status;
101 }
102
103 /**
104 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
105 *
106 * @clp: nfs_client under test
107 * @result: OUT: found nfs_client, or clp
108 * @cred: credential to use for trunking test
109 *
110 * Returns zero, a negative errno, or a negative NFS4ERR status.
111 * If zero is returned, an nfs_client pointer is planted in
112 * "result".
113 *
114 * Note: The returned client may not yet be marked ready.
115 */
116 int nfs40_discover_server_trunking(struct nfs_client *clp,
117 struct nfs_client **result,
118 struct rpc_cred *cred)
119 {
120 struct nfs4_setclientid_res clid = {
121 .clientid = clp->cl_clientid,
122 .confirm = clp->cl_confirm,
123 };
124 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
125 unsigned short port;
126 int status;
127
128 port = nn->nfs_callback_tcpport;
129 if (clp->cl_addr.ss_family == AF_INET6)
130 port = nn->nfs_callback_tcpport6;
131
132 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
133 if (status != 0)
134 goto out;
135 clp->cl_clientid = clid.clientid;
136 clp->cl_confirm = clid.confirm;
137
138 status = nfs40_walk_client_list(clp, result, cred);
139 switch (status) {
140 case -NFS4ERR_STALE_CLIENTID:
141 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
142 case 0:
143 /* Sustain the lease, even if it's empty. If the clientid4
144 * goes stale it's of no use for trunking discovery. */
145 nfs4_schedule_state_renewal(*result);
146 break;
147 }
148
149 out:
150 return status;
151 }
152
153 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
154 {
155 struct rpc_cred *cred = NULL;
156
157 if (clp->cl_machine_cred != NULL)
158 cred = get_rpccred(clp->cl_machine_cred);
159 return cred;
160 }
161
162 static void nfs4_clear_machine_cred(struct nfs_client *clp)
163 {
164 struct rpc_cred *cred;
165
166 spin_lock(&clp->cl_lock);
167 cred = clp->cl_machine_cred;
168 clp->cl_machine_cred = NULL;
169 spin_unlock(&clp->cl_lock);
170 if (cred != NULL)
171 put_rpccred(cred);
172 }
173
174 static struct rpc_cred *
175 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
176 {
177 struct rpc_cred *cred = NULL;
178 struct nfs4_state_owner *sp;
179 struct rb_node *pos;
180
181 for (pos = rb_first(&server->state_owners);
182 pos != NULL;
183 pos = rb_next(pos)) {
184 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
185 if (list_empty(&sp->so_states))
186 continue;
187 cred = get_rpccred(sp->so_cred);
188 break;
189 }
190 return cred;
191 }
192
193 /**
194 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
195 * @clp: client state handle
196 *
197 * Returns an rpc_cred with reference count bumped, or NULL.
198 * Caller must hold clp->cl_lock.
199 */
200 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
201 {
202 struct rpc_cred *cred = NULL;
203 struct nfs_server *server;
204
205 /* Use machine credentials if available */
206 cred = nfs4_get_machine_cred_locked(clp);
207 if (cred != NULL)
208 goto out;
209
210 rcu_read_lock();
211 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
212 cred = nfs4_get_renew_cred_server_locked(server);
213 if (cred != NULL)
214 break;
215 }
216 rcu_read_unlock();
217
218 out:
219 return cred;
220 }
221
222 #if defined(CONFIG_NFS_V4_1)
223
224 static int nfs41_setup_state_renewal(struct nfs_client *clp)
225 {
226 int status;
227 struct nfs_fsinfo fsinfo;
228
229 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
230 nfs4_schedule_state_renewal(clp);
231 return 0;
232 }
233
234 status = nfs4_proc_get_lease_time(clp, &fsinfo);
235 if (status == 0) {
236 /* Update lease time and schedule renewal */
237 spin_lock(&clp->cl_lock);
238 clp->cl_lease_time = fsinfo.lease_time * HZ;
239 clp->cl_last_renewal = jiffies;
240 spin_unlock(&clp->cl_lock);
241
242 nfs4_schedule_state_renewal(clp);
243 }
244
245 return status;
246 }
247
248 /*
249 * Back channel returns NFS4ERR_DELAY for new requests when
250 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
251 * is ended.
252 */
253 static void nfs4_end_drain_session(struct nfs_client *clp)
254 {
255 struct nfs4_session *ses = clp->cl_session;
256 struct nfs4_slot_table *tbl;
257 int max_slots;
258
259 if (ses == NULL)
260 return;
261 tbl = &ses->fc_slot_table;
262 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
263 spin_lock(&tbl->slot_tbl_lock);
264 max_slots = tbl->max_slots;
265 while (max_slots--) {
266 if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
267 nfs4_set_task_privileged,
268 NULL) == NULL)
269 break;
270 }
271 spin_unlock(&tbl->slot_tbl_lock);
272 }
273 }
274
275 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
276 {
277 spin_lock(&tbl->slot_tbl_lock);
278 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
279 INIT_COMPLETION(tbl->complete);
280 spin_unlock(&tbl->slot_tbl_lock);
281 return wait_for_completion_interruptible(&tbl->complete);
282 }
283 spin_unlock(&tbl->slot_tbl_lock);
284 return 0;
285 }
286
287 static int nfs4_begin_drain_session(struct nfs_client *clp)
288 {
289 struct nfs4_session *ses = clp->cl_session;
290 int ret = 0;
291
292 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
293 /* back channel */
294 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
295 if (ret)
296 return ret;
297 /* fore channel */
298 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
299 }
300
301 static void nfs41_finish_session_reset(struct nfs_client *clp)
302 {
303 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
304 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
305 /* create_session negotiated new slot table */
306 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
307 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
308 nfs41_setup_state_renewal(clp);
309 }
310
311 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
312 {
313 int status;
314
315 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
316 goto do_confirm;
317 nfs4_begin_drain_session(clp);
318 status = nfs4_proc_exchange_id(clp, cred);
319 if (status != 0)
320 goto out;
321 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
322 do_confirm:
323 status = nfs4_proc_create_session(clp, cred);
324 if (status != 0)
325 goto out;
326 nfs41_finish_session_reset(clp);
327 nfs_mark_client_ready(clp, NFS_CS_READY);
328 out:
329 return status;
330 }
331
332 /**
333 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
334 *
335 * @clp: nfs_client under test
336 * @result: OUT: found nfs_client, or clp
337 * @cred: credential to use for trunking test
338 *
339 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
340 * If NFS4_OK is returned, an nfs_client pointer is planted in
341 * "result".
342 *
343 * Note: The returned client may not yet be marked ready.
344 */
345 int nfs41_discover_server_trunking(struct nfs_client *clp,
346 struct nfs_client **result,
347 struct rpc_cred *cred)
348 {
349 int status;
350
351 status = nfs4_proc_exchange_id(clp, cred);
352 if (status != NFS4_OK)
353 return status;
354 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
355
356 return nfs41_walk_client_list(clp, result, cred);
357 }
358
359 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
360 {
361 struct rpc_cred *cred;
362
363 spin_lock(&clp->cl_lock);
364 cred = nfs4_get_machine_cred_locked(clp);
365 spin_unlock(&clp->cl_lock);
366 return cred;
367 }
368
369 #endif /* CONFIG_NFS_V4_1 */
370
371 static struct rpc_cred *
372 nfs4_get_setclientid_cred_server(struct nfs_server *server)
373 {
374 struct nfs_client *clp = server->nfs_client;
375 struct rpc_cred *cred = NULL;
376 struct nfs4_state_owner *sp;
377 struct rb_node *pos;
378
379 spin_lock(&clp->cl_lock);
380 pos = rb_first(&server->state_owners);
381 if (pos != NULL) {
382 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
383 cred = get_rpccred(sp->so_cred);
384 }
385 spin_unlock(&clp->cl_lock);
386 return cred;
387 }
388
389 /**
390 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
391 * @clp: client state handle
392 *
393 * Returns an rpc_cred with reference count bumped, or NULL.
394 */
395 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
396 {
397 struct nfs_server *server;
398 struct rpc_cred *cred;
399
400 spin_lock(&clp->cl_lock);
401 cred = nfs4_get_machine_cred_locked(clp);
402 spin_unlock(&clp->cl_lock);
403 if (cred != NULL)
404 goto out;
405
406 rcu_read_lock();
407 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
408 cred = nfs4_get_setclientid_cred_server(server);
409 if (cred != NULL)
410 break;
411 }
412 rcu_read_unlock();
413
414 out:
415 return cred;
416 }
417
418 static struct nfs4_state_owner *
419 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
420 {
421 struct rb_node **p = &server->state_owners.rb_node,
422 *parent = NULL;
423 struct nfs4_state_owner *sp;
424
425 while (*p != NULL) {
426 parent = *p;
427 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
428
429 if (cred < sp->so_cred)
430 p = &parent->rb_left;
431 else if (cred > sp->so_cred)
432 p = &parent->rb_right;
433 else {
434 if (!list_empty(&sp->so_lru))
435 list_del_init(&sp->so_lru);
436 atomic_inc(&sp->so_count);
437 return sp;
438 }
439 }
440 return NULL;
441 }
442
443 static struct nfs4_state_owner *
444 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
445 {
446 struct nfs_server *server = new->so_server;
447 struct rb_node **p = &server->state_owners.rb_node,
448 *parent = NULL;
449 struct nfs4_state_owner *sp;
450 int err;
451
452 while (*p != NULL) {
453 parent = *p;
454 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
455
456 if (new->so_cred < sp->so_cred)
457 p = &parent->rb_left;
458 else if (new->so_cred > sp->so_cred)
459 p = &parent->rb_right;
460 else {
461 if (!list_empty(&sp->so_lru))
462 list_del_init(&sp->so_lru);
463 atomic_inc(&sp->so_count);
464 return sp;
465 }
466 }
467 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
468 if (err)
469 return ERR_PTR(err);
470 rb_link_node(&new->so_server_node, parent, p);
471 rb_insert_color(&new->so_server_node, &server->state_owners);
472 return new;
473 }
474
475 static void
476 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
477 {
478 struct nfs_server *server = sp->so_server;
479
480 if (!RB_EMPTY_NODE(&sp->so_server_node))
481 rb_erase(&sp->so_server_node, &server->state_owners);
482 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
483 }
484
485 static void
486 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
487 {
488 sc->create_time = ktime_get();
489 sc->flags = 0;
490 sc->counter = 0;
491 spin_lock_init(&sc->lock);
492 INIT_LIST_HEAD(&sc->list);
493 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
494 }
495
496 static void
497 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
498 {
499 rpc_destroy_wait_queue(&sc->wait);
500 }
501
502 /*
503 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
504 * create a new state_owner.
505 *
506 */
507 static struct nfs4_state_owner *
508 nfs4_alloc_state_owner(struct nfs_server *server,
509 struct rpc_cred *cred,
510 gfp_t gfp_flags)
511 {
512 struct nfs4_state_owner *sp;
513
514 sp = kzalloc(sizeof(*sp), gfp_flags);
515 if (!sp)
516 return NULL;
517 sp->so_server = server;
518 sp->so_cred = get_rpccred(cred);
519 spin_lock_init(&sp->so_lock);
520 INIT_LIST_HEAD(&sp->so_states);
521 nfs4_init_seqid_counter(&sp->so_seqid);
522 atomic_set(&sp->so_count, 1);
523 INIT_LIST_HEAD(&sp->so_lru);
524 return sp;
525 }
526
527 static void
528 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
529 {
530 struct rb_node *rb_node = &sp->so_server_node;
531
532 if (!RB_EMPTY_NODE(rb_node)) {
533 struct nfs_server *server = sp->so_server;
534 struct nfs_client *clp = server->nfs_client;
535
536 spin_lock(&clp->cl_lock);
537 if (!RB_EMPTY_NODE(rb_node)) {
538 rb_erase(rb_node, &server->state_owners);
539 RB_CLEAR_NODE(rb_node);
540 }
541 spin_unlock(&clp->cl_lock);
542 }
543 }
544
545 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
546 {
547 nfs4_destroy_seqid_counter(&sp->so_seqid);
548 put_rpccred(sp->so_cred);
549 kfree(sp);
550 }
551
552 static void nfs4_gc_state_owners(struct nfs_server *server)
553 {
554 struct nfs_client *clp = server->nfs_client;
555 struct nfs4_state_owner *sp, *tmp;
556 unsigned long time_min, time_max;
557 LIST_HEAD(doomed);
558
559 spin_lock(&clp->cl_lock);
560 time_max = jiffies;
561 time_min = (long)time_max - (long)clp->cl_lease_time;
562 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
563 /* NB: LRU is sorted so that oldest is at the head */
564 if (time_in_range(sp->so_expires, time_min, time_max))
565 break;
566 list_move(&sp->so_lru, &doomed);
567 nfs4_remove_state_owner_locked(sp);
568 }
569 spin_unlock(&clp->cl_lock);
570
571 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
572 list_del(&sp->so_lru);
573 nfs4_free_state_owner(sp);
574 }
575 }
576
577 /**
578 * nfs4_get_state_owner - Look up a state owner given a credential
579 * @server: nfs_server to search
580 * @cred: RPC credential to match
581 *
582 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
583 */
584 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
585 struct rpc_cred *cred,
586 gfp_t gfp_flags)
587 {
588 struct nfs_client *clp = server->nfs_client;
589 struct nfs4_state_owner *sp, *new;
590
591 spin_lock(&clp->cl_lock);
592 sp = nfs4_find_state_owner_locked(server, cred);
593 spin_unlock(&clp->cl_lock);
594 if (sp != NULL)
595 goto out;
596 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
597 if (new == NULL)
598 goto out;
599 do {
600 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
601 break;
602 spin_lock(&clp->cl_lock);
603 sp = nfs4_insert_state_owner_locked(new);
604 spin_unlock(&clp->cl_lock);
605 } while (sp == ERR_PTR(-EAGAIN));
606 if (sp != new)
607 nfs4_free_state_owner(new);
608 out:
609 nfs4_gc_state_owners(server);
610 return sp;
611 }
612
613 /**
614 * nfs4_put_state_owner - Release a nfs4_state_owner
615 * @sp: state owner data to release
616 *
617 * Note that we keep released state owners on an LRU
618 * list.
619 * This caches valid state owners so that they can be
620 * reused, to avoid the OPEN_CONFIRM on minor version 0.
621 * It also pins the uniquifier of dropped state owners for
622 * a while, to ensure that those state owner names are
623 * never reused.
624 */
625 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
626 {
627 struct nfs_server *server = sp->so_server;
628 struct nfs_client *clp = server->nfs_client;
629
630 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
631 return;
632
633 sp->so_expires = jiffies;
634 list_add_tail(&sp->so_lru, &server->state_owners_lru);
635 spin_unlock(&clp->cl_lock);
636 }
637
638 /**
639 * nfs4_purge_state_owners - Release all cached state owners
640 * @server: nfs_server with cached state owners to release
641 *
642 * Called at umount time. Remaining state owners will be on
643 * the LRU with ref count of zero.
644 */
645 void nfs4_purge_state_owners(struct nfs_server *server)
646 {
647 struct nfs_client *clp = server->nfs_client;
648 struct nfs4_state_owner *sp, *tmp;
649 LIST_HEAD(doomed);
650
651 spin_lock(&clp->cl_lock);
652 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
653 list_move(&sp->so_lru, &doomed);
654 nfs4_remove_state_owner_locked(sp);
655 }
656 spin_unlock(&clp->cl_lock);
657
658 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
659 list_del(&sp->so_lru);
660 nfs4_free_state_owner(sp);
661 }
662 }
663
664 static struct nfs4_state *
665 nfs4_alloc_open_state(void)
666 {
667 struct nfs4_state *state;
668
669 state = kzalloc(sizeof(*state), GFP_NOFS);
670 if (!state)
671 return NULL;
672 atomic_set(&state->count, 1);
673 INIT_LIST_HEAD(&state->lock_states);
674 spin_lock_init(&state->state_lock);
675 seqlock_init(&state->seqlock);
676 return state;
677 }
678
679 void
680 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
681 {
682 if (state->state == fmode)
683 return;
684 /* NB! List reordering - see the reclaim code for why. */
685 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
686 if (fmode & FMODE_WRITE)
687 list_move(&state->open_states, &state->owner->so_states);
688 else
689 list_move_tail(&state->open_states, &state->owner->so_states);
690 }
691 state->state = fmode;
692 }
693
694 static struct nfs4_state *
695 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
696 {
697 struct nfs_inode *nfsi = NFS_I(inode);
698 struct nfs4_state *state;
699
700 list_for_each_entry(state, &nfsi->open_states, inode_states) {
701 if (state->owner != owner)
702 continue;
703 if (atomic_inc_not_zero(&state->count))
704 return state;
705 }
706 return NULL;
707 }
708
709 static void
710 nfs4_free_open_state(struct nfs4_state *state)
711 {
712 kfree(state);
713 }
714
715 struct nfs4_state *
716 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
717 {
718 struct nfs4_state *state, *new;
719 struct nfs_inode *nfsi = NFS_I(inode);
720
721 spin_lock(&inode->i_lock);
722 state = __nfs4_find_state_byowner(inode, owner);
723 spin_unlock(&inode->i_lock);
724 if (state)
725 goto out;
726 new = nfs4_alloc_open_state();
727 spin_lock(&owner->so_lock);
728 spin_lock(&inode->i_lock);
729 state = __nfs4_find_state_byowner(inode, owner);
730 if (state == NULL && new != NULL) {
731 state = new;
732 state->owner = owner;
733 atomic_inc(&owner->so_count);
734 list_add(&state->inode_states, &nfsi->open_states);
735 ihold(inode);
736 state->inode = inode;
737 spin_unlock(&inode->i_lock);
738 /* Note: The reclaim code dictates that we add stateless
739 * and read-only stateids to the end of the list */
740 list_add_tail(&state->open_states, &owner->so_states);
741 spin_unlock(&owner->so_lock);
742 } else {
743 spin_unlock(&inode->i_lock);
744 spin_unlock(&owner->so_lock);
745 if (new)
746 nfs4_free_open_state(new);
747 }
748 out:
749 return state;
750 }
751
752 void nfs4_put_open_state(struct nfs4_state *state)
753 {
754 struct inode *inode = state->inode;
755 struct nfs4_state_owner *owner = state->owner;
756
757 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
758 return;
759 spin_lock(&inode->i_lock);
760 list_del(&state->inode_states);
761 list_del(&state->open_states);
762 spin_unlock(&inode->i_lock);
763 spin_unlock(&owner->so_lock);
764 iput(inode);
765 nfs4_free_open_state(state);
766 nfs4_put_state_owner(owner);
767 }
768
769 /*
770 * Close the current file.
771 */
772 static void __nfs4_close(struct nfs4_state *state,
773 fmode_t fmode, gfp_t gfp_mask, int wait)
774 {
775 struct nfs4_state_owner *owner = state->owner;
776 int call_close = 0;
777 fmode_t newstate;
778
779 atomic_inc(&owner->so_count);
780 /* Protect against nfs4_find_state() */
781 spin_lock(&owner->so_lock);
782 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
783 case FMODE_READ:
784 state->n_rdonly--;
785 break;
786 case FMODE_WRITE:
787 state->n_wronly--;
788 break;
789 case FMODE_READ|FMODE_WRITE:
790 state->n_rdwr--;
791 }
792 newstate = FMODE_READ|FMODE_WRITE;
793 if (state->n_rdwr == 0) {
794 if (state->n_rdonly == 0) {
795 newstate &= ~FMODE_READ;
796 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
797 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
798 }
799 if (state->n_wronly == 0) {
800 newstate &= ~FMODE_WRITE;
801 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
802 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
803 }
804 if (newstate == 0)
805 clear_bit(NFS_DELEGATED_STATE, &state->flags);
806 }
807 nfs4_state_set_mode_locked(state, newstate);
808 spin_unlock(&owner->so_lock);
809
810 if (!call_close) {
811 nfs4_put_open_state(state);
812 nfs4_put_state_owner(owner);
813 } else
814 nfs4_do_close(state, gfp_mask, wait);
815 }
816
817 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
818 {
819 __nfs4_close(state, fmode, GFP_NOFS, 0);
820 }
821
822 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
823 {
824 __nfs4_close(state, fmode, GFP_KERNEL, 1);
825 }
826
827 /*
828 * Search the state->lock_states for an existing lock_owner
829 * that is compatible with current->files
830 */
831 static struct nfs4_lock_state *
832 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
833 {
834 struct nfs4_lock_state *pos;
835 list_for_each_entry(pos, &state->lock_states, ls_locks) {
836 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
837 continue;
838 switch (pos->ls_owner.lo_type) {
839 case NFS4_POSIX_LOCK_TYPE:
840 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
841 continue;
842 break;
843 case NFS4_FLOCK_LOCK_TYPE:
844 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
845 continue;
846 }
847 atomic_inc(&pos->ls_count);
848 return pos;
849 }
850 return NULL;
851 }
852
853 /*
854 * Return a compatible lock_state. If no initialized lock_state structure
855 * exists, return an uninitialized one.
856 *
857 */
858 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
859 {
860 struct nfs4_lock_state *lsp;
861 struct nfs_server *server = state->owner->so_server;
862
863 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
864 if (lsp == NULL)
865 return NULL;
866 nfs4_init_seqid_counter(&lsp->ls_seqid);
867 atomic_set(&lsp->ls_count, 1);
868 lsp->ls_state = state;
869 lsp->ls_owner.lo_type = type;
870 switch (lsp->ls_owner.lo_type) {
871 case NFS4_FLOCK_LOCK_TYPE:
872 lsp->ls_owner.lo_u.flock_owner = fl_pid;
873 break;
874 case NFS4_POSIX_LOCK_TYPE:
875 lsp->ls_owner.lo_u.posix_owner = fl_owner;
876 break;
877 default:
878 goto out_free;
879 }
880 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
881 if (lsp->ls_seqid.owner_id < 0)
882 goto out_free;
883 INIT_LIST_HEAD(&lsp->ls_locks);
884 return lsp;
885 out_free:
886 kfree(lsp);
887 return NULL;
888 }
889
890 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
891 {
892 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
893 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
894 kfree(lsp);
895 }
896
897 /*
898 * Return a compatible lock_state. If no initialized lock_state structure
899 * exists, return an uninitialized one.
900 *
901 */
902 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
903 {
904 struct nfs4_lock_state *lsp, *new = NULL;
905
906 for(;;) {
907 spin_lock(&state->state_lock);
908 lsp = __nfs4_find_lock_state(state, owner, pid, type);
909 if (lsp != NULL)
910 break;
911 if (new != NULL) {
912 list_add(&new->ls_locks, &state->lock_states);
913 set_bit(LK_STATE_IN_USE, &state->flags);
914 lsp = new;
915 new = NULL;
916 break;
917 }
918 spin_unlock(&state->state_lock);
919 new = nfs4_alloc_lock_state(state, owner, pid, type);
920 if (new == NULL)
921 return NULL;
922 }
923 spin_unlock(&state->state_lock);
924 if (new != NULL)
925 nfs4_free_lock_state(state->owner->so_server, new);
926 return lsp;
927 }
928
929 /*
930 * Release reference to lock_state, and free it if we see that
931 * it is no longer in use
932 */
933 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
934 {
935 struct nfs4_state *state;
936
937 if (lsp == NULL)
938 return;
939 state = lsp->ls_state;
940 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
941 return;
942 list_del(&lsp->ls_locks);
943 if (list_empty(&state->lock_states))
944 clear_bit(LK_STATE_IN_USE, &state->flags);
945 spin_unlock(&state->state_lock);
946 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
947 if (nfs4_release_lockowner(lsp) == 0)
948 return;
949 }
950 nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
951 }
952
953 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
954 {
955 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
956
957 dst->fl_u.nfs4_fl.owner = lsp;
958 atomic_inc(&lsp->ls_count);
959 }
960
961 static void nfs4_fl_release_lock(struct file_lock *fl)
962 {
963 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
964 }
965
966 static const struct file_lock_operations nfs4_fl_lock_ops = {
967 .fl_copy_lock = nfs4_fl_copy_lock,
968 .fl_release_private = nfs4_fl_release_lock,
969 };
970
971 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
972 {
973 struct nfs4_lock_state *lsp;
974
975 if (fl->fl_ops != NULL)
976 return 0;
977 if (fl->fl_flags & FL_POSIX)
978 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
979 else if (fl->fl_flags & FL_FLOCK)
980 lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
981 NFS4_FLOCK_LOCK_TYPE);
982 else
983 return -EINVAL;
984 if (lsp == NULL)
985 return -ENOMEM;
986 fl->fl_u.nfs4_fl.owner = lsp;
987 fl->fl_ops = &nfs4_fl_lock_ops;
988 return 0;
989 }
990
991 static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
992 const struct nfs_lockowner *lockowner)
993 {
994 struct nfs4_lock_state *lsp;
995 fl_owner_t fl_owner;
996 pid_t fl_pid;
997 bool ret = false;
998
999
1000 if (lockowner == NULL)
1001 goto out;
1002
1003 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1004 goto out;
1005
1006 fl_owner = lockowner->l_owner;
1007 fl_pid = lockowner->l_pid;
1008 spin_lock(&state->state_lock);
1009 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
1010 if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1011 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1012 ret = true;
1013 }
1014 spin_unlock(&state->state_lock);
1015 nfs4_put_lock_state(lsp);
1016 out:
1017 return ret;
1018 }
1019
1020 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1021 {
1022 int seq;
1023
1024 do {
1025 seq = read_seqbegin(&state->seqlock);
1026 nfs4_stateid_copy(dst, &state->stateid);
1027 } while (read_seqretry(&state->seqlock, seq));
1028 }
1029
1030 /*
1031 * Byte-range lock aware utility to initialize the stateid of read/write
1032 * requests.
1033 */
1034 void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
1035 fmode_t fmode, const struct nfs_lockowner *lockowner)
1036 {
1037 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
1038 return;
1039 if (nfs4_copy_lock_stateid(dst, state, lockowner))
1040 return;
1041 nfs4_copy_open_stateid(dst, state);
1042 }
1043
1044 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1045 {
1046 struct nfs_seqid *new;
1047
1048 new = kmalloc(sizeof(*new), gfp_mask);
1049 if (new != NULL) {
1050 new->sequence = counter;
1051 INIT_LIST_HEAD(&new->list);
1052 new->task = NULL;
1053 }
1054 return new;
1055 }
1056
1057 void nfs_release_seqid(struct nfs_seqid *seqid)
1058 {
1059 struct nfs_seqid_counter *sequence;
1060
1061 if (list_empty(&seqid->list))
1062 return;
1063 sequence = seqid->sequence;
1064 spin_lock(&sequence->lock);
1065 list_del_init(&seqid->list);
1066 if (!list_empty(&sequence->list)) {
1067 struct nfs_seqid *next;
1068
1069 next = list_first_entry(&sequence->list,
1070 struct nfs_seqid, list);
1071 rpc_wake_up_queued_task(&sequence->wait, next->task);
1072 }
1073 spin_unlock(&sequence->lock);
1074 }
1075
1076 void nfs_free_seqid(struct nfs_seqid *seqid)
1077 {
1078 nfs_release_seqid(seqid);
1079 kfree(seqid);
1080 }
1081
1082 /*
1083 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1084 * failed with a seqid incrementing error -
1085 * see comments nfs_fs.h:seqid_mutating_error()
1086 */
1087 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1088 {
1089 BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
1090 switch (status) {
1091 case 0:
1092 break;
1093 case -NFS4ERR_BAD_SEQID:
1094 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1095 return;
1096 pr_warn_ratelimited("NFS: v4 server returned a bad"
1097 " sequence-id error on an"
1098 " unconfirmed sequence %p!\n",
1099 seqid->sequence);
1100 case -NFS4ERR_STALE_CLIENTID:
1101 case -NFS4ERR_STALE_STATEID:
1102 case -NFS4ERR_BAD_STATEID:
1103 case -NFS4ERR_BADXDR:
1104 case -NFS4ERR_RESOURCE:
1105 case -NFS4ERR_NOFILEHANDLE:
1106 /* Non-seqid mutating errors */
1107 return;
1108 };
1109 /*
1110 * Note: no locking needed as we are guaranteed to be first
1111 * on the sequence list
1112 */
1113 seqid->sequence->counter++;
1114 }
1115
1116 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1117 {
1118 struct nfs4_state_owner *sp = container_of(seqid->sequence,
1119 struct nfs4_state_owner, so_seqid);
1120 struct nfs_server *server = sp->so_server;
1121
1122 if (status == -NFS4ERR_BAD_SEQID)
1123 nfs4_drop_state_owner(sp);
1124 if (!nfs4_has_session(server->nfs_client))
1125 nfs_increment_seqid(status, seqid);
1126 }
1127
1128 /*
1129 * Increment the seqid if the LOCK/LOCKU succeeded, or
1130 * failed with a seqid incrementing error -
1131 * see comments nfs_fs.h:seqid_mutating_error()
1132 */
1133 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1134 {
1135 nfs_increment_seqid(status, seqid);
1136 }
1137
1138 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1139 {
1140 struct nfs_seqid_counter *sequence = seqid->sequence;
1141 int status = 0;
1142
1143 spin_lock(&sequence->lock);
1144 seqid->task = task;
1145 if (list_empty(&seqid->list))
1146 list_add_tail(&seqid->list, &sequence->list);
1147 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1148 goto unlock;
1149 rpc_sleep_on(&sequence->wait, task, NULL);
1150 status = -EAGAIN;
1151 unlock:
1152 spin_unlock(&sequence->lock);
1153 return status;
1154 }
1155
1156 static int nfs4_run_state_manager(void *);
1157
1158 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1159 {
1160 smp_mb__before_clear_bit();
1161 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1162 smp_mb__after_clear_bit();
1163 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1164 rpc_wake_up(&clp->cl_rpcwaitq);
1165 }
1166
1167 /*
1168 * Schedule the nfs_client asynchronous state management routine
1169 */
1170 void nfs4_schedule_state_manager(struct nfs_client *clp)
1171 {
1172 struct task_struct *task;
1173 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1174
1175 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1176 return;
1177 __module_get(THIS_MODULE);
1178 atomic_inc(&clp->cl_count);
1179
1180 /* The rcu_read_lock() is not strictly necessary, as the state
1181 * manager is the only thread that ever changes the rpc_xprt
1182 * after it's initialized. At this point, we're single threaded. */
1183 rcu_read_lock();
1184 snprintf(buf, sizeof(buf), "%s-manager",
1185 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1186 rcu_read_unlock();
1187 task = kthread_run(nfs4_run_state_manager, clp, buf);
1188 if (IS_ERR(task)) {
1189 printk(KERN_ERR "%s: kthread_run: %ld\n",
1190 __func__, PTR_ERR(task));
1191 nfs4_clear_state_manager_bit(clp);
1192 nfs_put_client(clp);
1193 module_put(THIS_MODULE);
1194 }
1195 }
1196
1197 /*
1198 * Schedule a lease recovery attempt
1199 */
1200 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1201 {
1202 if (!clp)
1203 return;
1204 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1205 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1206 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1207 clp->cl_hostname);
1208 nfs4_schedule_state_manager(clp);
1209 }
1210 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1211
1212 /*
1213 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1214 * @clp: client to process
1215 *
1216 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1217 * resend of the SETCLIENTID and hence re-establish the
1218 * callback channel. Then return all existing delegations.
1219 */
1220 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1221 {
1222 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1223 nfs_expire_all_delegations(clp);
1224 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1225 clp->cl_hostname);
1226 }
1227
1228 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1229 {
1230 nfs40_handle_cb_pathdown(clp);
1231 nfs4_schedule_state_manager(clp);
1232 }
1233
1234 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1235 {
1236
1237 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1238 /* Don't recover state that expired before the reboot */
1239 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1240 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1241 return 0;
1242 }
1243 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1244 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1245 return 1;
1246 }
1247
1248 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1249 {
1250 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1251 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1252 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1253 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1254 return 1;
1255 }
1256
1257 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1258 {
1259 struct nfs_client *clp = server->nfs_client;
1260
1261 nfs4_state_mark_reclaim_nograce(clp, state);
1262 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1263 clp->cl_hostname);
1264 nfs4_schedule_state_manager(clp);
1265 }
1266 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1267
1268 void nfs_inode_find_state_and_recover(struct inode *inode,
1269 const nfs4_stateid *stateid)
1270 {
1271 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1272 struct nfs_inode *nfsi = NFS_I(inode);
1273 struct nfs_open_context *ctx;
1274 struct nfs4_state *state;
1275 bool found = false;
1276
1277 spin_lock(&inode->i_lock);
1278 list_for_each_entry(ctx, &nfsi->open_files, list) {
1279 state = ctx->state;
1280 if (state == NULL)
1281 continue;
1282 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1283 continue;
1284 if (!nfs4_stateid_match(&state->stateid, stateid))
1285 continue;
1286 nfs4_state_mark_reclaim_nograce(clp, state);
1287 found = true;
1288 }
1289 spin_unlock(&inode->i_lock);
1290 if (found)
1291 nfs4_schedule_state_manager(clp);
1292 }
1293
1294
1295 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1296 {
1297 struct inode *inode = state->inode;
1298 struct nfs_inode *nfsi = NFS_I(inode);
1299 struct file_lock *fl;
1300 int status = 0;
1301
1302 if (inode->i_flock == NULL)
1303 return 0;
1304
1305 /* Guard against delegation returns and new lock/unlock calls */
1306 down_write(&nfsi->rwsem);
1307 /* Protect inode->i_flock using the BKL */
1308 lock_flocks();
1309 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1310 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1311 continue;
1312 if (nfs_file_open_context(fl->fl_file)->state != state)
1313 continue;
1314 unlock_flocks();
1315 status = ops->recover_lock(state, fl);
1316 switch (status) {
1317 case 0:
1318 break;
1319 case -ESTALE:
1320 case -NFS4ERR_ADMIN_REVOKED:
1321 case -NFS4ERR_STALE_STATEID:
1322 case -NFS4ERR_BAD_STATEID:
1323 case -NFS4ERR_EXPIRED:
1324 case -NFS4ERR_NO_GRACE:
1325 case -NFS4ERR_STALE_CLIENTID:
1326 case -NFS4ERR_BADSESSION:
1327 case -NFS4ERR_BADSLOT:
1328 case -NFS4ERR_BAD_HIGH_SLOT:
1329 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1330 goto out;
1331 default:
1332 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1333 "Zeroing state\n", __func__, status);
1334 case -ENOMEM:
1335 case -NFS4ERR_DENIED:
1336 case -NFS4ERR_RECLAIM_BAD:
1337 case -NFS4ERR_RECLAIM_CONFLICT:
1338 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1339 status = 0;
1340 }
1341 lock_flocks();
1342 }
1343 unlock_flocks();
1344 out:
1345 up_write(&nfsi->rwsem);
1346 return status;
1347 }
1348
1349 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1350 {
1351 struct nfs4_state *state;
1352 struct nfs4_lock_state *lock;
1353 int status = 0;
1354
1355 /* Note: we rely on the sp->so_states list being ordered
1356 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1357 * states first.
1358 * This is needed to ensure that the server won't give us any
1359 * read delegations that we have to return if, say, we are
1360 * recovering after a network partition or a reboot from a
1361 * server that doesn't support a grace period.
1362 */
1363 restart:
1364 spin_lock(&sp->so_lock);
1365 list_for_each_entry(state, &sp->so_states, open_states) {
1366 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1367 continue;
1368 if (state->state == 0)
1369 continue;
1370 atomic_inc(&state->count);
1371 spin_unlock(&sp->so_lock);
1372 status = ops->recover_open(sp, state);
1373 if (status >= 0) {
1374 status = nfs4_reclaim_locks(state, ops);
1375 if (status >= 0) {
1376 spin_lock(&state->state_lock);
1377 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1378 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1379 pr_warn_ratelimited("NFS: "
1380 "%s: Lock reclaim "
1381 "failed!\n", __func__);
1382 }
1383 spin_unlock(&state->state_lock);
1384 nfs4_put_open_state(state);
1385 goto restart;
1386 }
1387 }
1388 switch (status) {
1389 default:
1390 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1391 "Zeroing state\n", __func__, status);
1392 case -ENOENT:
1393 case -ENOMEM:
1394 case -ESTALE:
1395 /*
1396 * Open state on this file cannot be recovered
1397 * All we can do is revert to using the zero stateid.
1398 */
1399 memset(&state->stateid, 0,
1400 sizeof(state->stateid));
1401 /* Mark the file as being 'closed' */
1402 state->state = 0;
1403 break;
1404 case -EKEYEXPIRED:
1405 /*
1406 * User RPCSEC_GSS context has expired.
1407 * We cannot recover this stateid now, so
1408 * skip it and allow recovery thread to
1409 * proceed.
1410 */
1411 break;
1412 case -NFS4ERR_ADMIN_REVOKED:
1413 case -NFS4ERR_STALE_STATEID:
1414 case -NFS4ERR_BAD_STATEID:
1415 case -NFS4ERR_RECLAIM_BAD:
1416 case -NFS4ERR_RECLAIM_CONFLICT:
1417 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1418 break;
1419 case -NFS4ERR_EXPIRED:
1420 case -NFS4ERR_NO_GRACE:
1421 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1422 case -NFS4ERR_STALE_CLIENTID:
1423 case -NFS4ERR_BADSESSION:
1424 case -NFS4ERR_BADSLOT:
1425 case -NFS4ERR_BAD_HIGH_SLOT:
1426 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1427 goto out_err;
1428 }
1429 nfs4_put_open_state(state);
1430 goto restart;
1431 }
1432 spin_unlock(&sp->so_lock);
1433 return 0;
1434 out_err:
1435 nfs4_put_open_state(state);
1436 return status;
1437 }
1438
1439 static void nfs4_clear_open_state(struct nfs4_state *state)
1440 {
1441 struct nfs4_lock_state *lock;
1442
1443 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1444 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1445 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1446 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1447 spin_lock(&state->state_lock);
1448 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1449 lock->ls_seqid.flags = 0;
1450 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1451 }
1452 spin_unlock(&state->state_lock);
1453 }
1454
1455 static void nfs4_reset_seqids(struct nfs_server *server,
1456 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1457 {
1458 struct nfs_client *clp = server->nfs_client;
1459 struct nfs4_state_owner *sp;
1460 struct rb_node *pos;
1461 struct nfs4_state *state;
1462
1463 spin_lock(&clp->cl_lock);
1464 for (pos = rb_first(&server->state_owners);
1465 pos != NULL;
1466 pos = rb_next(pos)) {
1467 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1468 sp->so_seqid.flags = 0;
1469 spin_lock(&sp->so_lock);
1470 list_for_each_entry(state, &sp->so_states, open_states) {
1471 if (mark_reclaim(clp, state))
1472 nfs4_clear_open_state(state);
1473 }
1474 spin_unlock(&sp->so_lock);
1475 }
1476 spin_unlock(&clp->cl_lock);
1477 }
1478
1479 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1480 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1481 {
1482 struct nfs_server *server;
1483
1484 rcu_read_lock();
1485 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1486 nfs4_reset_seqids(server, mark_reclaim);
1487 rcu_read_unlock();
1488 }
1489
1490 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1491 {
1492 /* Mark all delegations for reclaim */
1493 nfs_delegation_mark_reclaim(clp);
1494 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1495 }
1496
1497 static void nfs4_reclaim_complete(struct nfs_client *clp,
1498 const struct nfs4_state_recovery_ops *ops)
1499 {
1500 /* Notify the server we're done reclaiming our state */
1501 if (ops->reclaim_complete)
1502 (void)ops->reclaim_complete(clp);
1503 }
1504
1505 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1506 {
1507 struct nfs_client *clp = server->nfs_client;
1508 struct nfs4_state_owner *sp;
1509 struct rb_node *pos;
1510 struct nfs4_state *state;
1511
1512 spin_lock(&clp->cl_lock);
1513 for (pos = rb_first(&server->state_owners);
1514 pos != NULL;
1515 pos = rb_next(pos)) {
1516 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1517 spin_lock(&sp->so_lock);
1518 list_for_each_entry(state, &sp->so_states, open_states) {
1519 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1520 &state->flags))
1521 continue;
1522 nfs4_state_mark_reclaim_nograce(clp, state);
1523 }
1524 spin_unlock(&sp->so_lock);
1525 }
1526 spin_unlock(&clp->cl_lock);
1527 }
1528
1529 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1530 {
1531 struct nfs_server *server;
1532
1533 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1534 return 0;
1535
1536 rcu_read_lock();
1537 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1538 nfs4_clear_reclaim_server(server);
1539 rcu_read_unlock();
1540
1541 nfs_delegation_reap_unclaimed(clp);
1542 return 1;
1543 }
1544
1545 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1546 {
1547 if (!nfs4_state_clear_reclaim_reboot(clp))
1548 return;
1549 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1550 }
1551
1552 static void nfs_delegation_clear_all(struct nfs_client *clp)
1553 {
1554 nfs_delegation_mark_reclaim(clp);
1555 nfs_delegation_reap_unclaimed(clp);
1556 }
1557
1558 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1559 {
1560 nfs_delegation_clear_all(clp);
1561 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1562 }
1563
1564 static void nfs4_warn_keyexpired(const char *s)
1565 {
1566 printk_ratelimited(KERN_WARNING "Error: state manager"
1567 " encountered RPCSEC_GSS session"
1568 " expired against NFSv4 server %s.\n",
1569 s);
1570 }
1571
1572 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1573 {
1574 switch (error) {
1575 case 0:
1576 break;
1577 case -NFS4ERR_CB_PATH_DOWN:
1578 nfs40_handle_cb_pathdown(clp);
1579 break;
1580 case -NFS4ERR_NO_GRACE:
1581 nfs4_state_end_reclaim_reboot(clp);
1582 break;
1583 case -NFS4ERR_STALE_CLIENTID:
1584 case -NFS4ERR_LEASE_MOVED:
1585 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1586 nfs4_state_clear_reclaim_reboot(clp);
1587 nfs4_state_start_reclaim_reboot(clp);
1588 break;
1589 case -NFS4ERR_EXPIRED:
1590 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1591 nfs4_state_start_reclaim_nograce(clp);
1592 break;
1593 case -NFS4ERR_BADSESSION:
1594 case -NFS4ERR_BADSLOT:
1595 case -NFS4ERR_BAD_HIGH_SLOT:
1596 case -NFS4ERR_DEADSESSION:
1597 case -NFS4ERR_SEQ_FALSE_RETRY:
1598 case -NFS4ERR_SEQ_MISORDERED:
1599 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1600 /* Zero session reset errors */
1601 break;
1602 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1603 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1604 break;
1605 case -EKEYEXPIRED:
1606 /* Nothing we can do */
1607 nfs4_warn_keyexpired(clp->cl_hostname);
1608 break;
1609 default:
1610 dprintk("%s: failed to handle error %d for server %s\n",
1611 __func__, error, clp->cl_hostname);
1612 return error;
1613 }
1614 dprintk("%s: handled error %d for server %s\n", __func__, error,
1615 clp->cl_hostname);
1616 return 0;
1617 }
1618
1619 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1620 {
1621 struct nfs4_state_owner *sp;
1622 struct nfs_server *server;
1623 struct rb_node *pos;
1624 int status = 0;
1625
1626 restart:
1627 rcu_read_lock();
1628 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1629 nfs4_purge_state_owners(server);
1630 spin_lock(&clp->cl_lock);
1631 for (pos = rb_first(&server->state_owners);
1632 pos != NULL;
1633 pos = rb_next(pos)) {
1634 sp = rb_entry(pos,
1635 struct nfs4_state_owner, so_server_node);
1636 if (!test_and_clear_bit(ops->owner_flag_bit,
1637 &sp->so_flags))
1638 continue;
1639 atomic_inc(&sp->so_count);
1640 spin_unlock(&clp->cl_lock);
1641 rcu_read_unlock();
1642
1643 status = nfs4_reclaim_open_state(sp, ops);
1644 if (status < 0) {
1645 set_bit(ops->owner_flag_bit, &sp->so_flags);
1646 nfs4_put_state_owner(sp);
1647 return nfs4_recovery_handle_error(clp, status);
1648 }
1649
1650 nfs4_put_state_owner(sp);
1651 goto restart;
1652 }
1653 spin_unlock(&clp->cl_lock);
1654 }
1655 rcu_read_unlock();
1656 return status;
1657 }
1658
1659 static int nfs4_check_lease(struct nfs_client *clp)
1660 {
1661 struct rpc_cred *cred;
1662 const struct nfs4_state_maintenance_ops *ops =
1663 clp->cl_mvops->state_renewal_ops;
1664 int status;
1665
1666 /* Is the client already known to have an expired lease? */
1667 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1668 return 0;
1669 spin_lock(&clp->cl_lock);
1670 cred = ops->get_state_renewal_cred_locked(clp);
1671 spin_unlock(&clp->cl_lock);
1672 if (cred == NULL) {
1673 cred = nfs4_get_setclientid_cred(clp);
1674 status = -ENOKEY;
1675 if (cred == NULL)
1676 goto out;
1677 }
1678 status = ops->renew_lease(clp, cred);
1679 put_rpccred(cred);
1680 out:
1681 return nfs4_recovery_handle_error(clp, status);
1682 }
1683
1684 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1685 * and for recoverable errors on EXCHANGE_ID for v4.1
1686 */
1687 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1688 {
1689 switch (status) {
1690 case -NFS4ERR_SEQ_MISORDERED:
1691 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1692 return -ESERVERFAULT;
1693 /* Lease confirmation error: retry after purging the lease */
1694 ssleep(1);
1695 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1696 break;
1697 case -NFS4ERR_STALE_CLIENTID:
1698 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1699 nfs4_state_clear_reclaim_reboot(clp);
1700 nfs4_state_start_reclaim_reboot(clp);
1701 break;
1702 case -NFS4ERR_CLID_INUSE:
1703 pr_err("NFS: Server %s reports our clientid is in use\n",
1704 clp->cl_hostname);
1705 nfs_mark_client_ready(clp, -EPERM);
1706 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1707 return -EPERM;
1708 case -EACCES:
1709 if (clp->cl_machine_cred == NULL)
1710 return -EACCES;
1711 /* Handle case where the user hasn't set up machine creds */
1712 nfs4_clear_machine_cred(clp);
1713 case -NFS4ERR_DELAY:
1714 case -ETIMEDOUT:
1715 case -EAGAIN:
1716 ssleep(1);
1717 break;
1718
1719 case -NFS4ERR_MINOR_VERS_MISMATCH:
1720 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1721 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1722 dprintk("%s: exit with error %d for server %s\n",
1723 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1724 return -EPROTONOSUPPORT;
1725 case -EKEYEXPIRED:
1726 nfs4_warn_keyexpired(clp->cl_hostname);
1727 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1728 * in nfs4_exchange_id */
1729 default:
1730 dprintk("%s: exit with error %d for server %s\n", __func__,
1731 status, clp->cl_hostname);
1732 return status;
1733 }
1734 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1735 dprintk("%s: handled error %d for server %s\n", __func__, status,
1736 clp->cl_hostname);
1737 return 0;
1738 }
1739
1740 static int nfs4_establish_lease(struct nfs_client *clp)
1741 {
1742 struct rpc_cred *cred;
1743 const struct nfs4_state_recovery_ops *ops =
1744 clp->cl_mvops->reboot_recovery_ops;
1745 int status;
1746
1747 cred = ops->get_clid_cred(clp);
1748 if (cred == NULL)
1749 return -ENOENT;
1750 status = ops->establish_clid(clp, cred);
1751 put_rpccred(cred);
1752 if (status != 0)
1753 return status;
1754 pnfs_destroy_all_layouts(clp);
1755 return 0;
1756 }
1757
1758 /*
1759 * Returns zero or a negative errno. NFS4ERR values are converted
1760 * to local errno values.
1761 */
1762 static int nfs4_reclaim_lease(struct nfs_client *clp)
1763 {
1764 int status;
1765
1766 status = nfs4_establish_lease(clp);
1767 if (status < 0)
1768 return nfs4_handle_reclaim_lease_error(clp, status);
1769 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1770 nfs4_state_start_reclaim_nograce(clp);
1771 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1772 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1773 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1774 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1775 return 0;
1776 }
1777
1778 static int nfs4_purge_lease(struct nfs_client *clp)
1779 {
1780 int status;
1781
1782 status = nfs4_establish_lease(clp);
1783 if (status < 0)
1784 return nfs4_handle_reclaim_lease_error(clp, status);
1785 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1786 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1787 nfs4_state_start_reclaim_nograce(clp);
1788 return 0;
1789 }
1790
1791 /**
1792 * nfs4_discover_server_trunking - Detect server IP address trunking
1793 *
1794 * @clp: nfs_client under test
1795 * @result: OUT: found nfs_client, or clp
1796 *
1797 * Returns zero or a negative errno. If zero is returned,
1798 * an nfs_client pointer is planted in "result".
1799 *
1800 * Note: since we are invoked in process context, and
1801 * not from inside the state manager, we cannot use
1802 * nfs4_handle_reclaim_lease_error().
1803 */
1804 int nfs4_discover_server_trunking(struct nfs_client *clp,
1805 struct nfs_client **result)
1806 {
1807 const struct nfs4_state_recovery_ops *ops =
1808 clp->cl_mvops->reboot_recovery_ops;
1809 rpc_authflavor_t *flavors, flav, save;
1810 struct rpc_clnt *clnt;
1811 struct rpc_cred *cred;
1812 int i, len, status;
1813
1814 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
1815
1816 len = NFS_MAX_SECFLAVORS;
1817 flavors = kcalloc(len, sizeof(*flavors), GFP_KERNEL);
1818 if (flavors == NULL) {
1819 status = -ENOMEM;
1820 goto out;
1821 }
1822 len = rpcauth_list_flavors(flavors, len);
1823 if (len < 0) {
1824 status = len;
1825 goto out_free;
1826 }
1827 clnt = clp->cl_rpcclient;
1828 save = clnt->cl_auth->au_flavor;
1829 i = 0;
1830
1831 mutex_lock(&nfs_clid_init_mutex);
1832 status = -ENOENT;
1833 again:
1834 cred = ops->get_clid_cred(clp);
1835 if (cred == NULL)
1836 goto out_unlock;
1837
1838 status = ops->detect_trunking(clp, result, cred);
1839 put_rpccred(cred);
1840 switch (status) {
1841 case 0:
1842 break;
1843
1844 case -EACCES:
1845 if (clp->cl_machine_cred == NULL)
1846 break;
1847 /* Handle case where the user hasn't set up machine creds */
1848 nfs4_clear_machine_cred(clp);
1849 case -NFS4ERR_DELAY:
1850 case -ETIMEDOUT:
1851 case -EAGAIN:
1852 ssleep(1);
1853 dprintk("NFS: %s after status %d, retrying\n",
1854 __func__, status);
1855 goto again;
1856
1857 case -NFS4ERR_CLID_INUSE:
1858 case -NFS4ERR_WRONGSEC:
1859 status = -EPERM;
1860 if (i >= len)
1861 break;
1862
1863 flav = flavors[i++];
1864 if (flav == save)
1865 flav = flavors[i++];
1866 clnt = rpc_clone_client_set_auth(clnt, flav);
1867 if (IS_ERR(clnt)) {
1868 status = PTR_ERR(clnt);
1869 break;
1870 }
1871 clp->cl_rpcclient = clnt;
1872 goto again;
1873
1874 case -NFS4ERR_MINOR_VERS_MISMATCH:
1875 status = -EPROTONOSUPPORT;
1876 break;
1877
1878 case -EKEYEXPIRED:
1879 nfs4_warn_keyexpired(clp->cl_hostname);
1880 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1881 * in nfs4_exchange_id */
1882 status = -EKEYEXPIRED;
1883 }
1884
1885 out_unlock:
1886 mutex_unlock(&nfs_clid_init_mutex);
1887 out_free:
1888 kfree(flavors);
1889 out:
1890 dprintk("NFS: %s: status = %d\n", __func__, status);
1891 return status;
1892 }
1893
1894 #ifdef CONFIG_NFS_V4_1
1895 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
1896 {
1897 struct nfs_client *clp = session->clp;
1898
1899 switch (err) {
1900 default:
1901 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1902 break;
1903 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1904 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1905 }
1906 nfs4_schedule_lease_recovery(clp);
1907 }
1908 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1909
1910 void nfs41_handle_recall_slot(struct nfs_client *clp)
1911 {
1912 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1913 dprintk("%s: scheduling slot recall for server %s\n", __func__,
1914 clp->cl_hostname);
1915 nfs4_schedule_state_manager(clp);
1916 }
1917
1918 static void nfs4_reset_all_state(struct nfs_client *clp)
1919 {
1920 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1921 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1922 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1923 nfs4_state_start_reclaim_nograce(clp);
1924 dprintk("%s: scheduling reset of all state for server %s!\n",
1925 __func__, clp->cl_hostname);
1926 nfs4_schedule_state_manager(clp);
1927 }
1928 }
1929
1930 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1931 {
1932 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1933 nfs4_state_start_reclaim_reboot(clp);
1934 dprintk("%s: server %s rebooted!\n", __func__,
1935 clp->cl_hostname);
1936 nfs4_schedule_state_manager(clp);
1937 }
1938 }
1939
1940 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1941 {
1942 nfs4_reset_all_state(clp);
1943 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
1944 }
1945
1946 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1947 {
1948 /* This will need to handle layouts too */
1949 nfs_expire_all_delegations(clp);
1950 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
1951 clp->cl_hostname);
1952 }
1953
1954 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
1955 {
1956 nfs_expire_all_delegations(clp);
1957 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1958 nfs4_schedule_state_manager(clp);
1959 dprintk("%s: server %s declared a backchannel fault\n", __func__,
1960 clp->cl_hostname);
1961 }
1962
1963 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1964 {
1965 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
1966 &clp->cl_state) == 0)
1967 nfs4_schedule_state_manager(clp);
1968 }
1969
1970 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1971 {
1972 if (!flags)
1973 return;
1974
1975 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
1976 __func__, clp->cl_hostname, clp->cl_clientid, flags);
1977
1978 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1979 nfs41_handle_server_reboot(clp);
1980 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1981 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1982 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1983 SEQ4_STATUS_LEASE_MOVED))
1984 nfs41_handle_state_revoked(clp);
1985 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1986 nfs41_handle_recallable_state_revoked(clp);
1987 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
1988 nfs41_handle_backchannel_fault(clp);
1989 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1990 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1991 nfs41_handle_cb_path_down(clp);
1992 }
1993
1994 static int nfs4_reset_session(struct nfs_client *clp)
1995 {
1996 struct rpc_cred *cred;
1997 int status;
1998
1999 if (!nfs4_has_session(clp))
2000 return 0;
2001 nfs4_begin_drain_session(clp);
2002 cred = nfs4_get_exchange_id_cred(clp);
2003 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2004 if (status && status != -NFS4ERR_BADSESSION &&
2005 status != -NFS4ERR_DEADSESSION) {
2006 status = nfs4_recovery_handle_error(clp, status);
2007 goto out;
2008 }
2009
2010 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2011 status = nfs4_proc_create_session(clp, cred);
2012 if (status) {
2013 dprintk("%s: session reset failed with status %d for server %s!\n",
2014 __func__, status, clp->cl_hostname);
2015 status = nfs4_handle_reclaim_lease_error(clp, status);
2016 goto out;
2017 }
2018 nfs41_finish_session_reset(clp);
2019 dprintk("%s: session reset was successful for server %s!\n",
2020 __func__, clp->cl_hostname);
2021 out:
2022 if (cred)
2023 put_rpccred(cred);
2024 return status;
2025 }
2026
2027 static int nfs4_recall_slot(struct nfs_client *clp)
2028 {
2029 struct nfs4_slot_table *fc_tbl;
2030 struct nfs4_slot *new, *old;
2031 int i;
2032
2033 if (!nfs4_has_session(clp))
2034 return 0;
2035 nfs4_begin_drain_session(clp);
2036 fc_tbl = &clp->cl_session->fc_slot_table;
2037 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
2038 GFP_NOFS);
2039 if (!new)
2040 return -ENOMEM;
2041
2042 spin_lock(&fc_tbl->slot_tbl_lock);
2043 for (i = 0; i < fc_tbl->target_max_slots; i++)
2044 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
2045 old = fc_tbl->slots;
2046 fc_tbl->slots = new;
2047 fc_tbl->max_slots = fc_tbl->target_max_slots;
2048 fc_tbl->target_max_slots = 0;
2049 clp->cl_session->fc_attrs.max_reqs = fc_tbl->max_slots;
2050 spin_unlock(&fc_tbl->slot_tbl_lock);
2051
2052 kfree(old);
2053 return 0;
2054 }
2055
2056 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2057 {
2058 struct rpc_cred *cred;
2059 int ret;
2060
2061 if (!nfs4_has_session(clp))
2062 return 0;
2063 nfs4_begin_drain_session(clp);
2064 cred = nfs4_get_exchange_id_cred(clp);
2065 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2066 if (cred)
2067 put_rpccred(cred);
2068 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2069 switch (ret) {
2070 case 0:
2071 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2072 __func__, clp->cl_hostname);
2073 break;
2074 case -NFS4ERR_DELAY:
2075 ssleep(1);
2076 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2077 break;
2078 default:
2079 return nfs4_recovery_handle_error(clp, ret);
2080 }
2081 return 0;
2082 }
2083 #else /* CONFIG_NFS_V4_1 */
2084 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2085 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
2086 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
2087
2088 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2089 {
2090 return 0;
2091 }
2092 #endif /* CONFIG_NFS_V4_1 */
2093
2094 static void nfs4_state_manager(struct nfs_client *clp)
2095 {
2096 int status = 0;
2097 const char *section = "", *section_sep = "";
2098
2099 /* Ensure exclusive access to NFSv4 state */
2100 do {
2101 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2102 section = "purge state";
2103 status = nfs4_purge_lease(clp);
2104 if (status < 0)
2105 goto out_error;
2106 continue;
2107 }
2108
2109 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2110 section = "lease expired";
2111 /* We're going to have to re-establish a clientid */
2112 status = nfs4_reclaim_lease(clp);
2113 if (status < 0)
2114 goto out_error;
2115 continue;
2116 }
2117
2118 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2119 section = "check lease";
2120 status = nfs4_check_lease(clp);
2121 if (status < 0)
2122 goto out_error;
2123 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2124 continue;
2125 }
2126
2127 /* Initialize or reset the session */
2128 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2129 section = "reset session";
2130 status = nfs4_reset_session(clp);
2131 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2132 continue;
2133 if (status < 0)
2134 goto out_error;
2135 }
2136
2137 /* Send BIND_CONN_TO_SESSION */
2138 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2139 &clp->cl_state)) {
2140 section = "bind conn to session";
2141 status = nfs4_bind_conn_to_session(clp);
2142 if (status < 0)
2143 goto out_error;
2144 continue;
2145 }
2146
2147 /* Recall session slots */
2148 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)) {
2149 section = "recall slot";
2150 status = nfs4_recall_slot(clp);
2151 if (status < 0)
2152 goto out_error;
2153 continue;
2154 }
2155
2156 /* First recover reboot state... */
2157 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2158 section = "reclaim reboot";
2159 status = nfs4_do_reclaim(clp,
2160 clp->cl_mvops->reboot_recovery_ops);
2161 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2162 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
2163 continue;
2164 nfs4_state_end_reclaim_reboot(clp);
2165 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2166 continue;
2167 if (status < 0)
2168 goto out_error;
2169 }
2170
2171 /* Now recover expired state... */
2172 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2173 section = "reclaim nograce";
2174 status = nfs4_do_reclaim(clp,
2175 clp->cl_mvops->nograce_recovery_ops);
2176 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2177 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
2178 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
2179 continue;
2180 if (status < 0)
2181 goto out_error;
2182 }
2183
2184 nfs4_end_drain_session(clp);
2185 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2186 nfs_client_return_marked_delegations(clp);
2187 continue;
2188 }
2189
2190 nfs4_clear_state_manager_bit(clp);
2191 /* Did we race with an attempt to give us more work? */
2192 if (clp->cl_state == 0)
2193 break;
2194 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2195 break;
2196 } while (atomic_read(&clp->cl_count) > 1);
2197 return;
2198 out_error:
2199 if (strlen(section))
2200 section_sep = ": ";
2201 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2202 " with error %d\n", section_sep, section,
2203 clp->cl_hostname, -status);
2204 ssleep(1);
2205 nfs4_end_drain_session(clp);
2206 nfs4_clear_state_manager_bit(clp);
2207 }
2208
2209 static int nfs4_run_state_manager(void *ptr)
2210 {
2211 struct nfs_client *clp = ptr;
2212
2213 allow_signal(SIGKILL);
2214 nfs4_state_manager(clp);
2215 nfs_put_client(clp);
2216 module_put_and_exit(0);
2217 return 0;
2218 }
2219
2220 /*
2221 * Local variables:
2222 * c-basic-offset: 8
2223 * End:
2224 */
Linux 2.6 libata-dev (mirror)