blob: cd2d90400d465bd4e142c666c417de5c8d8a6ae9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Trond Myklebust6f43ddc2007-07-08 16:49:11 -040041#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/slab.h>
43#include <linux/smp_lock.h>
44#include <linux/nfs_fs.h>
45#include <linux/nfs_idmap.h>
Trond Myklebust5043e902006-01-03 09:55:23 +010046#include <linux/kthread.h>
47#include <linux/module.h>
Trond Myklebust9f958ab2007-07-02 13:58:33 -040048#include <linux/random.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/workqueue.h>
50#include <linux/bitops.h>
51
Trond Myklebust4ce79712005-06-22 17:16:21 +000052#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include "callback.h"
54#include "delegation.h"
David Howells24c8dbb2006-08-22 20:06:10 -040055#include "internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57#define OPENOWNER_POOL_SIZE 8
58
Trond Myklebust4ce79712005-06-22 17:16:21 +000059const nfs4_stateid zero_stateid;
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061static LIST_HEAD(nfs4_clientid_list);
62
Andy Adamson591d71c2009-04-01 09:22:47 -040063int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040065 struct nfs4_setclientid_res clid;
Chuck Leverf738f512009-03-18 20:48:06 -040066 unsigned short port;
67 int status;
68
69 port = nfs_callback_tcpport;
70 if (clp->cl_addr.ss_family == AF_INET6)
71 port = nfs_callback_tcpport6;
72
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040073 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
74 if (status != 0)
75 goto out;
76 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
77 if (status != 0)
78 goto out;
79 clp->cl_clientid = clid.clientid;
80 nfs4_schedule_state_renewal(clp);
81out:
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 return status;
83}
84
Andy Adamsona7b72102009-04-01 09:22:46 -040085struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040086{
87 struct rpc_cred *cred = NULL;
88
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040089 if (clp->cl_machine_cred != NULL)
90 cred = get_rpccred(clp->cl_machine_cred);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040091 return cred;
92}
93
94static void nfs4_clear_machine_cred(struct nfs_client *clp)
95{
96 struct rpc_cred *cred;
97
98 spin_lock(&clp->cl_lock);
99 cred = clp->cl_machine_cred;
100 clp->cl_machine_cred = NULL;
101 spin_unlock(&clp->cl_lock);
102 if (cred != NULL)
103 put_rpccred(cred);
104}
105
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500106struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100107{
108 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400109 struct rb_node *pos;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100110 struct rpc_cred *cred = NULL;
111
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400112 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
113 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100114 if (list_empty(&sp->so_states))
115 continue;
116 cred = get_rpccred(sp->so_cred);
117 break;
118 }
119 return cred;
120}
121
Andy Adamsonb4b82602009-04-01 09:22:49 -0400122#if defined(CONFIG_NFS_V4_1)
123
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500124static int nfs41_setup_state_renewal(struct nfs_client *clp)
125{
126 int status;
127 struct nfs_fsinfo fsinfo;
128
129 status = nfs4_proc_get_lease_time(clp, &fsinfo);
130 if (status == 0) {
131 /* Update lease time and schedule renewal */
132 spin_lock(&clp->cl_lock);
133 clp->cl_lease_time = fsinfo.lease_time * HZ;
134 clp->cl_last_renewal = jiffies;
135 spin_unlock(&clp->cl_lock);
136
137 nfs4_schedule_state_renewal(clp);
138 }
139
140 return status;
141}
142
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800143static void nfs4_end_drain_session(struct nfs_client *clp)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500144{
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800145 struct nfs4_session *ses = clp->cl_session;
Alexandros Batsakis689cf5c2009-12-14 21:27:56 -0800146 int max_slots;
147
148 if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
149 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
150 max_slots = ses->fc_slot_table.max_slots;
151 while (max_slots--) {
152 struct rpc_task *task;
153
154 task = rpc_wake_up_next(&ses->fc_slot_table.
155 slot_tbl_waitq);
156 if (!task)
157 break;
158 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
159 }
160 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
161 }
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500162}
163
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800164static int nfs4_begin_drain_session(struct nfs_client *clp)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500165{
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800166 struct nfs4_session *ses = clp->cl_session;
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500167 struct nfs4_slot_table *tbl = &ses->fc_slot_table;
168
169 spin_lock(&tbl->slot_tbl_lock);
170 set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
171 if (tbl->highest_used_slotid != -1) {
172 INIT_COMPLETION(ses->complete);
173 spin_unlock(&tbl->slot_tbl_lock);
174 return wait_for_completion_interruptible(&ses->complete);
175 }
176 spin_unlock(&tbl->slot_tbl_lock);
177 return 0;
178}
179
Andy Adamson4d643d12009-12-04 15:52:24 -0500180int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
181{
182 int status;
183
Trond Myklebust38045412009-12-15 17:36:57 -0500184 nfs4_begin_drain_session(clp);
Andy Adamson4d643d12009-12-04 15:52:24 -0500185 status = nfs4_proc_exchange_id(clp, cred);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500186 if (status != 0)
187 goto out;
188 status = nfs4_proc_create_session(clp);
189 if (status != 0)
190 goto out;
191 nfs41_setup_state_renewal(clp);
192 nfs_mark_client_ready(clp, NFS_CS_READY);
193out:
Andy Adamson4d643d12009-12-04 15:52:24 -0500194 return status;
195}
196
Andy Adamsonb4b82602009-04-01 09:22:49 -0400197struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
198{
199 struct rpc_cred *cred;
200
201 spin_lock(&clp->cl_lock);
202 cred = nfs4_get_machine_cred_locked(clp);
203 spin_unlock(&clp->cl_lock);
204 return cred;
205}
206
207#endif /* CONFIG_NFS_V4_1 */
208
Andy Adamsona7b72102009-04-01 09:22:46 -0400209struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
Trond Myklebust286d7d62006-01-03 09:55:26 +0100210{
211 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400212 struct rb_node *pos;
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400213 struct rpc_cred *cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100214
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500215 spin_lock(&clp->cl_lock);
216 cred = nfs4_get_machine_cred_locked(clp);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400217 if (cred != NULL)
218 goto out;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400219 pos = rb_first(&clp->cl_state_owners);
220 if (pos != NULL) {
221 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400222 cred = get_rpccred(sp->so_cred);
Trond Myklebust286d7d62006-01-03 09:55:26 +0100223 }
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400224out:
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500225 spin_unlock(&clp->cl_lock);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400226 return cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100227}
228
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400229static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
230 __u64 minval, int maxbits)
231{
232 struct rb_node **p, *parent;
233 struct nfs_unique_id *pos;
234 __u64 mask = ~0ULL;
235
236 if (maxbits < 64)
237 mask = (1ULL << maxbits) - 1ULL;
238
239 /* Ensure distribution is more or less flat */
240 get_random_bytes(&new->id, sizeof(new->id));
241 new->id &= mask;
242 if (new->id < minval)
243 new->id += minval;
244retry:
245 p = &root->rb_node;
246 parent = NULL;
247
248 while (*p != NULL) {
249 parent = *p;
250 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
251
252 if (new->id < pos->id)
253 p = &(*p)->rb_left;
254 else if (new->id > pos->id)
255 p = &(*p)->rb_right;
256 else
257 goto id_exists;
258 }
259 rb_link_node(&new->rb_node, parent, p);
260 rb_insert_color(&new->rb_node, root);
261 return;
262id_exists:
263 for (;;) {
264 new->id++;
265 if (new->id < minval || (new->id & mask) != new->id) {
266 new->id = minval;
267 break;
268 }
269 parent = rb_next(parent);
270 if (parent == NULL)
271 break;
272 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
273 if (new->id < pos->id)
274 break;
275 }
276 goto retry;
277}
278
279static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
280{
281 rb_erase(&id->rb_node, root);
282}
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284static struct nfs4_state_owner *
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400285nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400287 struct nfs_client *clp = server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400288 struct rb_node **p = &clp->cl_state_owners.rb_node,
289 *parent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 struct nfs4_state_owner *sp, *res = NULL;
291
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400292 while (*p != NULL) {
293 parent = *p;
294 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
295
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400296 if (server < sp->so_server) {
297 p = &parent->rb_left;
298 continue;
299 }
300 if (server > sp->so_server) {
301 p = &parent->rb_right;
302 continue;
303 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400304 if (cred < sp->so_cred)
305 p = &parent->rb_left;
306 else if (cred > sp->so_cred)
307 p = &parent->rb_right;
308 else {
309 atomic_inc(&sp->so_count);
310 res = sp;
311 break;
312 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 }
314 return res;
315}
316
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400317static struct nfs4_state_owner *
318nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
319{
320 struct rb_node **p = &clp->cl_state_owners.rb_node,
321 *parent = NULL;
322 struct nfs4_state_owner *sp;
323
324 while (*p != NULL) {
325 parent = *p;
326 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
327
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400328 if (new->so_server < sp->so_server) {
329 p = &parent->rb_left;
330 continue;
331 }
332 if (new->so_server > sp->so_server) {
333 p = &parent->rb_right;
334 continue;
335 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400336 if (new->so_cred < sp->so_cred)
337 p = &parent->rb_left;
338 else if (new->so_cred > sp->so_cred)
339 p = &parent->rb_right;
340 else {
341 atomic_inc(&sp->so_count);
342 return sp;
343 }
344 }
345 nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
346 rb_link_node(&new->so_client_node, parent, p);
347 rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
348 return new;
349}
350
351static void
352nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
353{
354 if (!RB_EMPTY_NODE(&sp->so_client_node))
355 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
356 nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
357}
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359/*
360 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
361 * create a new state_owner.
362 *
363 */
364static struct nfs4_state_owner *
365nfs4_alloc_state_owner(void)
366{
367 struct nfs4_state_owner *sp;
368
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700369 sp = kzalloc(sizeof(*sp),GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 if (!sp)
371 return NULL;
Trond Myklebustec073422005-10-20 14:22:47 -0700372 spin_lock_init(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 INIT_LIST_HEAD(&sp->so_states);
374 INIT_LIST_HEAD(&sp->so_delegations);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700375 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
376 sp->so_seqid.sequence = &sp->so_sequence;
377 spin_lock_init(&sp->so_sequence.lock);
378 INIT_LIST_HEAD(&sp->so_sequence.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 atomic_set(&sp->so_count, 1);
380 return sp;
381}
382
Adrian Bunk1d2e88e2008-05-02 13:42:45 -0700383static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384nfs4_drop_state_owner(struct nfs4_state_owner *sp)
385{
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400386 if (!RB_EMPTY_NODE(&sp->so_client_node)) {
387 struct nfs_client *clp = sp->so_client;
388
389 spin_lock(&clp->cl_lock);
390 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
391 RB_CLEAR_NODE(&sp->so_client_node);
392 spin_unlock(&clp->cl_lock);
393 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
397{
David Howells7539bba2006-08-22 20:06:09 -0400398 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 struct nfs4_state_owner *sp, *new;
400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 spin_lock(&clp->cl_lock);
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400402 sp = nfs4_find_state_owner(server, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 if (sp != NULL)
405 return sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400406 new = nfs4_alloc_state_owner();
407 if (new == NULL)
408 return NULL;
409 new->so_client = clp;
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400410 new->so_server = server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400411 new->so_cred = cred;
412 spin_lock(&clp->cl_lock);
413 sp = nfs4_insert_state_owner(clp, new);
414 spin_unlock(&clp->cl_lock);
415 if (sp == new)
416 get_rpccred(cred);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500417 else {
418 rpc_destroy_wait_queue(&new->so_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400419 kfree(new);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500420 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400421 return sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422}
423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424void nfs4_put_state_owner(struct nfs4_state_owner *sp)
425{
David Howellsadfa6f92006-08-22 20:06:08 -0400426 struct nfs_client *clp = sp->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 struct rpc_cred *cred = sp->so_cred;
428
429 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
430 return;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400431 nfs4_remove_state_owner(clp, sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500433 rpc_destroy_wait_queue(&sp->so_sequence.wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 put_rpccred(cred);
435 kfree(sp);
436}
437
438static struct nfs4_state *
439nfs4_alloc_open_state(void)
440{
441 struct nfs4_state *state;
442
Trond Myklebuste7616922006-01-03 09:55:13 +0100443 state = kzalloc(sizeof(*state), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (!state)
445 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 atomic_set(&state->count, 1);
447 INIT_LIST_HEAD(&state->lock_states);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000448 spin_lock_init(&state->state_lock);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400449 seqlock_init(&state->seqlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 return state;
451}
452
Trond Myklebust4cecb762005-11-04 15:32:58 -0500453void
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500454nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500455{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500456 if (state->state == fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500457 return;
458 /* NB! List reordering - see the reclaim code for why. */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500459 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
460 if (fmode & FMODE_WRITE)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500461 list_move(&state->open_states, &state->owner->so_states);
462 else
463 list_move_tail(&state->open_states, &state->owner->so_states);
464 }
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500465 state->state = fmode;
Trond Myklebust4cecb762005-11-04 15:32:58 -0500466}
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468static struct nfs4_state *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
470{
471 struct nfs_inode *nfsi = NFS_I(inode);
472 struct nfs4_state *state;
473
474 list_for_each_entry(state, &nfsi->open_states, inode_states) {
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400475 if (state->owner != owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 continue;
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400477 if (atomic_inc_not_zero(&state->count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 return state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 }
480 return NULL;
481}
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483static void
484nfs4_free_open_state(struct nfs4_state *state)
485{
486 kfree(state);
487}
488
489struct nfs4_state *
490nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
491{
492 struct nfs4_state *state, *new;
493 struct nfs_inode *nfsi = NFS_I(inode);
494
495 spin_lock(&inode->i_lock);
496 state = __nfs4_find_state_byowner(inode, owner);
497 spin_unlock(&inode->i_lock);
498 if (state)
499 goto out;
500 new = nfs4_alloc_open_state();
Trond Myklebustec073422005-10-20 14:22:47 -0700501 spin_lock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 spin_lock(&inode->i_lock);
503 state = __nfs4_find_state_byowner(inode, owner);
504 if (state == NULL && new != NULL) {
505 state = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 state->owner = owner;
507 atomic_inc(&owner->so_count);
508 list_add(&state->inode_states, &nfsi->open_states);
509 state->inode = igrab(inode);
510 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700511 /* Note: The reclaim code dictates that we add stateless
512 * and read-only stateids to the end of the list */
513 list_add_tail(&state->open_states, &owner->so_states);
514 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 } else {
516 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700517 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 if (new)
519 nfs4_free_open_state(new);
520 }
521out:
522 return state;
523}
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525void nfs4_put_open_state(struct nfs4_state *state)
526{
527 struct inode *inode = state->inode;
528 struct nfs4_state_owner *owner = state->owner;
529
Trond Myklebustec073422005-10-20 14:22:47 -0700530 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 return;
Trond Myklebustec073422005-10-20 14:22:47 -0700532 spin_lock(&inode->i_lock);
Trond Myklebustba683032007-07-27 10:23:05 -0400533 list_del(&state->inode_states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 list_del(&state->open_states);
Trond Myklebustec073422005-10-20 14:22:47 -0700535 spin_unlock(&inode->i_lock);
536 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 nfs4_free_open_state(state);
539 nfs4_put_state_owner(owner);
540}
541
542/*
Trond Myklebust83c9d412005-10-18 14:20:13 -0700543 * Close the current file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500545static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 struct nfs4_state_owner *owner = state->owner;
Trond Myklebust003707c2007-07-05 18:07:55 -0400548 int call_close = 0;
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500549 fmode_t newstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 atomic_inc(&owner->so_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 /* Protect against nfs4_find_state() */
Trond Myklebustec073422005-10-20 14:22:47 -0700553 spin_lock(&owner->so_lock);
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500554 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100555 case FMODE_READ:
556 state->n_rdonly--;
557 break;
558 case FMODE_WRITE:
559 state->n_wronly--;
560 break;
561 case FMODE_READ|FMODE_WRITE:
562 state->n_rdwr--;
563 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400564 newstate = FMODE_READ|FMODE_WRITE;
Trond Myklebuste7616922006-01-03 09:55:13 +0100565 if (state->n_rdwr == 0) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400566 if (state->n_rdonly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100567 newstate &= ~FMODE_READ;
Trond Myklebust003707c2007-07-05 18:07:55 -0400568 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
569 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
570 }
571 if (state->n_wronly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100572 newstate &= ~FMODE_WRITE;
Trond Myklebust003707c2007-07-05 18:07:55 -0400573 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
574 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
575 }
576 if (newstate == 0)
577 clear_bit(NFS_DELEGATED_STATE, &state->flags);
Trond Myklebuste7616922006-01-03 09:55:13 +0100578 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400579 nfs4_state_set_mode_locked(state, newstate);
Trond Myklebustec073422005-10-20 14:22:47 -0700580 spin_unlock(&owner->so_lock);
Trond Myklebust4cecb762005-11-04 15:32:58 -0500581
Trond Myklebust003707c2007-07-05 18:07:55 -0400582 if (!call_close) {
Trond Myklebustb39e6252007-06-11 23:05:07 -0400583 nfs4_put_open_state(state);
584 nfs4_put_state_owner(owner);
585 } else
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400586 nfs4_do_close(path, state, wait);
587}
588
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500589void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400590{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500591 __nfs4_close(path, state, fmode, 0);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400592}
593
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500594void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400595{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500596 __nfs4_close(path, state, fmode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
598
599/*
600 * Search the state->lock_states for an existing lock_owner
601 * that is compatible with current->files
602 */
603static struct nfs4_lock_state *
604__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
605{
606 struct nfs4_lock_state *pos;
607 list_for_each_entry(pos, &state->lock_states, ls_locks) {
608 if (pos->ls_owner != fl_owner)
609 continue;
610 atomic_inc(&pos->ls_count);
611 return pos;
612 }
613 return NULL;
614}
615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616/*
617 * Return a compatible lock_state. If no initialized lock_state structure
618 * exists, return an uninitialized one.
619 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 */
621static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
622{
623 struct nfs4_lock_state *lsp;
David Howellsadfa6f92006-08-22 20:06:08 -0400624 struct nfs_client *clp = state->owner->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700626 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 if (lsp == NULL)
628 return NULL;
Trond Myklebustd0dc3702008-01-10 16:07:54 -0500629 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
630 spin_lock_init(&lsp->ls_sequence.lock);
631 INIT_LIST_HEAD(&lsp->ls_sequence.list);
632 lsp->ls_seqid.sequence = &lsp->ls_sequence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 atomic_set(&lsp->ls_count, 1);
Trond Myklebustb64aec82009-07-21 16:47:46 -0400634 lsp->ls_state = state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 lsp->ls_owner = fl_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 spin_lock(&clp->cl_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400637 nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 spin_unlock(&clp->cl_lock);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000639 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 return lsp;
641}
642
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400643static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
644{
645 struct nfs_client *clp = lsp->ls_state->owner->so_client;
646
647 spin_lock(&clp->cl_lock);
648 nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
649 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500650 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400651 kfree(lsp);
652}
653
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654/*
655 * Return a compatible lock_state. If no initialized lock_state structure
656 * exists, return an uninitialized one.
657 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000659static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000661 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000663 for(;;) {
664 spin_lock(&state->state_lock);
665 lsp = __nfs4_find_lock_state(state, owner);
666 if (lsp != NULL)
667 break;
668 if (new != NULL) {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000669 list_add(&new->ls_locks, &state->lock_states);
670 set_bit(LK_STATE_IN_USE, &state->flags);
671 lsp = new;
672 new = NULL;
673 break;
674 }
675 spin_unlock(&state->state_lock);
676 new = nfs4_alloc_lock_state(state, owner);
677 if (new == NULL)
678 return NULL;
679 }
680 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400681 if (new != NULL)
682 nfs4_free_lock_state(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 return lsp;
684}
685
686/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000687 * Release reference to lock_state, and free it if we see that
688 * it is no longer in use
689 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700690void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000691{
692 struct nfs4_state *state;
693
694 if (lsp == NULL)
695 return;
696 state = lsp->ls_state;
697 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
698 return;
699 list_del(&lsp->ls_locks);
700 if (list_empty(&state->lock_states))
701 clear_bit(LK_STATE_IN_USE, &state->flags);
702 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400703 nfs4_free_lock_state(lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000704}
705
706static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
707{
708 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
709
710 dst->fl_u.nfs4_fl.owner = lsp;
711 atomic_inc(&lsp->ls_count);
712}
713
714static void nfs4_fl_release_lock(struct file_lock *fl)
715{
716 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
717}
718
Alexey Dobriyan6aed6282009-09-21 17:01:11 -0700719static const struct file_lock_operations nfs4_fl_lock_ops = {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000720 .fl_copy_lock = nfs4_fl_copy_lock,
721 .fl_release_private = nfs4_fl_release_lock,
722};
723
724int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
725{
726 struct nfs4_lock_state *lsp;
727
728 if (fl->fl_ops != NULL)
729 return 0;
730 lsp = nfs4_get_lock_state(state, fl->fl_owner);
731 if (lsp == NULL)
732 return -ENOMEM;
733 fl->fl_u.nfs4_fl.owner = lsp;
734 fl->fl_ops = &nfs4_fl_lock_ops;
735 return 0;
736}
737
738/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 * Byte-range lock aware utility to initialize the stateid of read/write
740 * requests.
741 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000742void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000744 struct nfs4_lock_state *lsp;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400745 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400747 do {
748 seq = read_seqbegin(&state->seqlock);
749 memcpy(dst, &state->stateid, sizeof(*dst));
750 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000751 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
752 return;
753
754 spin_lock(&state->state_lock);
755 lsp = __nfs4_find_lock_state(state, fl_owner);
756 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
757 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
758 spin_unlock(&state->state_lock);
759 nfs4_put_lock_state(lsp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760}
761
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700762struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700764 struct nfs_seqid *new;
765
766 new = kmalloc(sizeof(*new), GFP_KERNEL);
767 if (new != NULL) {
768 new->sequence = counter;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500769 INIT_LIST_HEAD(&new->list);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700770 }
771 return new;
772}
773
Trond Myklebust72211db2009-12-15 14:47:36 -0500774void nfs_release_seqid(struct nfs_seqid *seqid)
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700775{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500776 if (!list_empty(&seqid->list)) {
777 struct rpc_sequence *sequence = seqid->sequence->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700778
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500779 spin_lock(&sequence->lock);
Trond Myklebust72211db2009-12-15 14:47:36 -0500780 list_del_init(&seqid->list);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500781 spin_unlock(&sequence->lock);
782 rpc_wake_up(&sequence->wait);
783 }
Trond Myklebust72211db2009-12-15 14:47:36 -0500784}
785
786void nfs_free_seqid(struct nfs_seqid *seqid)
787{
788 nfs_release_seqid(seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700789 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790}
791
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700793 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
794 * failed with a seqid incrementing error -
795 * see comments nfs_fs.h:seqid_mutating_error()
796 */
Trond Myklebust88d90932007-07-02 14:03:03 -0400797static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500799 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700800 switch (status) {
801 case 0:
802 break;
803 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400804 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
805 return;
806 printk(KERN_WARNING "NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -0800807 " sequence-id error on an"
808 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400809 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700810 case -NFS4ERR_STALE_CLIENTID:
811 case -NFS4ERR_STALE_STATEID:
812 case -NFS4ERR_BAD_STATEID:
813 case -NFS4ERR_BADXDR:
814 case -NFS4ERR_RESOURCE:
815 case -NFS4ERR_NOFILEHANDLE:
816 /* Non-seqid mutating errors */
817 return;
818 };
819 /*
820 * Note: no locking needed as we are guaranteed to be first
821 * on the sequence list
822 */
823 seqid->sequence->counter++;
824}
825
826void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
827{
Benny Halevy34dc1ad2009-04-01 09:22:52 -0400828 struct nfs4_state_owner *sp = container_of(seqid->sequence,
829 struct nfs4_state_owner, so_seqid);
830 struct nfs_server *server = sp->so_server;
831
832 if (status == -NFS4ERR_BAD_SEQID)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 nfs4_drop_state_owner(sp);
Benny Halevy34dc1ad2009-04-01 09:22:52 -0400834 if (!nfs4_has_session(server->nfs_client))
835 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700836}
837
838/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700839 * Increment the seqid if the LOCK/LOCKU succeeded, or
840 * failed with a seqid incrementing error -
841 * see comments nfs_fs.h:seqid_mutating_error()
842 */
843void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
844{
Trond Myklebust88d90932007-07-02 14:03:03 -0400845 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700846}
847
848int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
849{
850 struct rpc_sequence *sequence = seqid->sequence->sequence;
851 int status = 0;
852
853 spin_lock(&sequence->lock);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500854 if (list_empty(&seqid->list))
855 list_add_tail(&seqid->list, &sequence->list);
856 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
857 goto unlock;
Trond Myklebust5d008372008-02-22 16:34:17 -0500858 rpc_sleep_on(&sequence->wait, task, NULL);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500859 status = -EAGAIN;
860unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700861 spin_unlock(&sequence->lock);
862 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863}
864
Trond Myklebuste005e802008-12-23 15:21:48 -0500865static int nfs4_run_state_manager(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
Trond Myklebuste005e802008-12-23 15:21:48 -0500867static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +0100868{
869 smp_mb__before_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -0500870 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100871 smp_mb__after_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -0500872 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100873 rpc_wake_up(&clp->cl_rpcwaitq);
874}
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876/*
Trond Myklebuste005e802008-12-23 15:21:48 -0500877 * Schedule the nfs_client asynchronous state management routine
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 */
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500879void nfs4_schedule_state_manager(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880{
Trond Myklebust5043e902006-01-03 09:55:23 +0100881 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
Trond Myklebuste005e802008-12-23 15:21:48 -0500883 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
884 return;
Trond Myklebust5043e902006-01-03 09:55:23 +0100885 __module_get(THIS_MODULE);
886 atomic_inc(&clp->cl_count);
Trond Myklebuste005e802008-12-23 15:21:48 -0500887 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
Chuck Lever5d8515c2007-12-10 14:57:16 -0500888 rpc_peeraddr2str(clp->cl_rpcclient,
889 RPC_DISPLAY_ADDR));
Trond Myklebust5043e902006-01-03 09:55:23 +0100890 if (!IS_ERR(task))
891 return;
Trond Myklebuste005e802008-12-23 15:21:48 -0500892 nfs4_clear_state_manager_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400893 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +0100894 module_put(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895}
896
897/*
898 * Schedule a state recovery attempt
899 */
David Howellsadfa6f92006-08-22 20:06:08 -0400900void nfs4_schedule_state_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901{
902 if (!clp)
903 return;
Trond Myklebuste598d842008-12-23 15:21:42 -0500904 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
905 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Trond Myklebuste005e802008-12-23 15:21:48 -0500906 nfs4_schedule_state_manager(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907}
908
Trond Myklebusta2c0b9e2010-01-26 15:42:47 -0500909int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500910{
911
912 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
913 /* Don't recover state that expired before the reboot */
914 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
915 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
916 return 0;
917 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -0500918 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500919 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
920 return 1;
921}
922
Trond Myklebust9e33bed2008-12-23 15:21:46 -0500923int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500924{
925 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
926 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
Trond Myklebust7eff03a2008-12-23 15:21:43 -0500927 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500928 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
929 return 1;
930}
931
Trond Myklebust02860012008-12-23 15:21:40 -0500932static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933{
934 struct inode *inode = state->inode;
Trond Myklebust19e03c52008-12-23 15:21:44 -0500935 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 struct file_lock *fl;
937 int status = 0;
938
Trond Myklebust3f09df72009-06-17 13:23:00 -0700939 if (inode->i_flock == NULL)
940 return 0;
941
942 /* Guard against delegation returns and new lock/unlock calls */
Trond Myklebust19e03c52008-12-23 15:21:44 -0500943 down_write(&nfsi->rwsem);
Trond Myklebust3f09df72009-06-17 13:23:00 -0700944 /* Protect inode->i_flock using the BKL */
945 lock_kernel();
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800946 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
Trond Myklebust43b2a332005-11-04 15:35:30 -0500947 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 continue;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400949 if (nfs_file_open_context(fl->fl_file)->state != state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 continue;
Trond Myklebust3f09df72009-06-17 13:23:00 -0700951 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 status = ops->recover_lock(state, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 switch (status) {
Trond Myklebust965b5d62009-06-17 13:22:59 -0700954 case 0:
955 break;
956 case -ESTALE:
957 case -NFS4ERR_ADMIN_REVOKED:
958 case -NFS4ERR_STALE_STATEID:
959 case -NFS4ERR_BAD_STATEID:
960 case -NFS4ERR_EXPIRED:
961 case -NFS4ERR_NO_GRACE:
962 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -0500963 case -NFS4ERR_BADSESSION:
964 case -NFS4ERR_BADSLOT:
965 case -NFS4ERR_BAD_HIGH_SLOT:
966 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Trond Myklebust965b5d62009-06-17 13:22:59 -0700967 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 default:
969 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700970 __func__, status);
Trond Myklebust965b5d62009-06-17 13:22:59 -0700971 case -ENOMEM:
972 case -NFS4ERR_DENIED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 case -NFS4ERR_RECLAIM_BAD:
974 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust43b2a332005-11-04 15:35:30 -0500975 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
Trond Myklebust965b5d62009-06-17 13:22:59 -0700976 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 }
Trond Myklebust3f09df72009-06-17 13:23:00 -0700978 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 }
Trond Myklebust3f09df72009-06-17 13:23:00 -0700980 unlock_kernel();
Trond Myklebust965b5d62009-06-17 13:22:59 -0700981out:
Trond Myklebust19e03c52008-12-23 15:21:44 -0500982 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 return status;
984}
985
Trond Myklebust02860012008-12-23 15:21:40 -0500986static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987{
988 struct nfs4_state *state;
989 struct nfs4_lock_state *lock;
990 int status = 0;
991
992 /* Note: we rely on the sp->so_states list being ordered
993 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
994 * states first.
995 * This is needed to ensure that the server won't give us any
996 * read delegations that we have to return if, say, we are
997 * recovering after a network partition or a reboot from a
998 * server that doesn't support a grace period.
999 */
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001000restart:
1001 spin_lock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001003 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1004 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 if (state->state == 0)
1006 continue;
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001007 atomic_inc(&state->count);
1008 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 if (status >= 0) {
Trond Myklebust02860012008-12-23 15:21:40 -05001011 status = nfs4_reclaim_locks(state, ops);
1012 if (status >= 0) {
1013 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1014 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1015 printk("%s: Lock reclaim failed!\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001016 __func__);
Trond Myklebust02860012008-12-23 15:21:40 -05001017 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001018 nfs4_put_open_state(state);
1019 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 }
1022 switch (status) {
1023 default:
1024 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001025 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 case -ENOENT:
Trond Myklebust965b5d62009-06-17 13:22:59 -07001027 case -ENOMEM:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001028 case -ESTALE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 /*
1030 * Open state on this file cannot be recovered
1031 * All we can do is revert to using the zero stateid.
1032 */
1033 memset(state->stateid.data, 0,
1034 sizeof(state->stateid.data));
1035 /* Mark the file as being 'closed' */
1036 state->state = 0;
1037 break;
Trond Myklebust965b5d62009-06-17 13:22:59 -07001038 case -NFS4ERR_ADMIN_REVOKED:
1039 case -NFS4ERR_STALE_STATEID:
1040 case -NFS4ERR_BAD_STATEID:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001041 case -NFS4ERR_RECLAIM_BAD:
1042 case -NFS4ERR_RECLAIM_CONFLICT:
1043 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
1044 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 case -NFS4ERR_EXPIRED:
1046 case -NFS4ERR_NO_GRACE:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001047 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -05001049 case -NFS4ERR_BADSESSION:
1050 case -NFS4ERR_BADSLOT:
1051 case -NFS4ERR_BAD_HIGH_SLOT:
1052 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 goto out_err;
1054 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001055 nfs4_put_open_state(state);
1056 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001058 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 return 0;
1060out_err:
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001061 nfs4_put_open_state(state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 return status;
1063}
1064
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001065static void nfs4_clear_open_state(struct nfs4_state *state)
1066{
1067 struct nfs4_lock_state *lock;
1068
1069 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1070 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1071 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1072 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1073 list_for_each_entry(lock, &state->lock_states, ls_locks) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001074 lock->ls_seqid.flags = 0;
1075 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1076 }
1077}
1078
1079static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001080{
1081 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001082 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001083 struct nfs4_state *state;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001084
1085 /* Reset all sequence ids to zero */
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001086 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1087 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001088 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -07001089 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001090 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001091 if (mark_reclaim(clp, state))
1092 nfs4_clear_open_state(state);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001093 }
Trond Myklebustec073422005-10-20 14:22:47 -07001094 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001095 }
1096}
1097
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001098static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1099{
1100 /* Mark all delegations for reclaim */
1101 nfs_delegation_mark_reclaim(clp);
1102 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1103}
1104
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001105static void nfs4_reclaim_complete(struct nfs_client *clp,
1106 const struct nfs4_state_recovery_ops *ops)
1107{
1108 /* Notify the server we're done reclaiming our state */
1109 if (ops->reclaim_complete)
1110 (void)ops->reclaim_complete(clp);
1111}
1112
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001113static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1114{
1115 struct nfs4_state_owner *sp;
1116 struct rb_node *pos;
1117 struct nfs4_state *state;
1118
1119 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1120 return;
1121
Ricardo Labiaga7cab89b2009-12-08 14:35:28 -05001122 nfs4_reclaim_complete(clp,
1123 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
1124
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001125 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1126 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1127 spin_lock(&sp->so_lock);
1128 list_for_each_entry(state, &sp->so_states, open_states) {
1129 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
1130 continue;
1131 nfs4_state_mark_reclaim_nograce(clp, state);
1132 }
1133 spin_unlock(&sp->so_lock);
1134 }
1135
1136 nfs_delegation_reap_unclaimed(clp);
1137}
1138
1139static void nfs_delegation_clear_all(struct nfs_client *clp)
1140{
1141 nfs_delegation_mark_reclaim(clp);
1142 nfs_delegation_reap_unclaimed(clp);
1143}
1144
1145static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1146{
1147 nfs_delegation_clear_all(clp);
1148 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1149}
1150
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001151static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
Trond Myklebuste598d842008-12-23 15:21:42 -05001152{
1153 switch (error) {
1154 case -NFS4ERR_CB_PATH_DOWN:
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001155 nfs_handle_cb_pathdown(clp);
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001156 return 0;
Trond Myklebustc8b7ae3d2009-12-03 15:53:21 -05001157 case -NFS4ERR_NO_GRACE:
1158 nfs4_state_end_reclaim_reboot(clp);
1159 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001160 case -NFS4ERR_STALE_CLIENTID:
1161 case -NFS4ERR_LEASE_MOVED:
1162 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Trond Myklebuste345e882009-12-03 15:52:41 -05001163 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebuste598d842008-12-23 15:21:42 -05001164 nfs4_state_start_reclaim_reboot(clp);
1165 break;
1166 case -NFS4ERR_EXPIRED:
1167 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1168 nfs4_state_start_reclaim_nograce(clp);
Andy Adamson8ba9bf82009-12-04 15:55:34 -05001169 break;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001170 case -NFS4ERR_BADSESSION:
1171 case -NFS4ERR_BADSLOT:
1172 case -NFS4ERR_BAD_HIGH_SLOT:
1173 case -NFS4ERR_DEADSESSION:
1174 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1175 case -NFS4ERR_SEQ_FALSE_RETRY:
1176 case -NFS4ERR_SEQ_MISORDERED:
Andy Adamson6df08182009-12-04 15:55:05 -05001177 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
Andy Adamson0b9e2d42009-12-04 16:02:14 -05001178 /* Zero session reset errors */
1179 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001180 }
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001181 return error;
Trond Myklebuste598d842008-12-23 15:21:42 -05001182}
1183
Trond Myklebust02860012008-12-23 15:21:40 -05001184static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185{
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001186 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 int status = 0;
1188
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001189restart:
1190 spin_lock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001191 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1192 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001193 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1194 continue;
1195 atomic_inc(&sp->so_count);
1196 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001197 status = nfs4_reclaim_open_state(sp, ops);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001198 if (status < 0) {
1199 set_bit(ops->owner_flag_bit, &sp->so_flags);
1200 nfs4_put_state_owner(sp);
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001201 return nfs4_recovery_handle_error(clp, status);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001202 }
1203 nfs4_put_state_owner(sp);
1204 goto restart;
Trond Myklebust02860012008-12-23 15:21:40 -05001205 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001206 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001207 return status;
1208}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209
Trond Myklebust02860012008-12-23 15:21:40 -05001210static int nfs4_check_lease(struct nfs_client *clp)
1211{
1212 struct rpc_cred *cred;
Benny Halevy8e69514f2009-04-01 09:22:45 -04001213 struct nfs4_state_maintenance_ops *ops =
1214 nfs4_state_renewal_ops[clp->cl_minorversion];
Trond Myklebust02860012008-12-23 15:21:40 -05001215 int status = -NFS4ERR_EXPIRED;
1216
Trond Myklebust0f605b52008-12-23 15:21:42 -05001217 /* Is the client already known to have an expired lease? */
1218 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1219 return 0;
Andy Adamsona7b72102009-04-01 09:22:46 -04001220 spin_lock(&clp->cl_lock);
1221 cred = ops->get_state_renewal_cred_locked(clp);
1222 spin_unlock(&clp->cl_lock);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001223 if (cred == NULL) {
1224 cred = nfs4_get_setclientid_cred(clp);
1225 if (cred == NULL)
1226 goto out;
Trond Myklebust02860012008-12-23 15:21:40 -05001227 }
Benny Halevy8e69514f2009-04-01 09:22:45 -04001228 status = ops->renew_lease(clp, cred);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001229 put_rpccred(cred);
1230out:
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001231 return nfs4_recovery_handle_error(clp, status);
Trond Myklebust02860012008-12-23 15:21:40 -05001232}
1233
1234static int nfs4_reclaim_lease(struct nfs_client *clp)
1235{
1236 struct rpc_cred *cred;
Andy Adamson591d71c2009-04-01 09:22:47 -04001237 struct nfs4_state_recovery_ops *ops =
1238 nfs4_reboot_recovery_ops[clp->cl_minorversion];
Trond Myklebust02860012008-12-23 15:21:40 -05001239 int status = -ENOENT;
1240
Andy Adamson90a16612009-04-01 09:22:48 -04001241 cred = ops->get_clid_cred(clp);
Trond Myklebust02860012008-12-23 15:21:40 -05001242 if (cred != NULL) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001243 status = ops->establish_clid(clp, cred);
Trond Myklebust02860012008-12-23 15:21:40 -05001244 put_rpccred(cred);
1245 /* Handle case where the user hasn't set up machine creds */
1246 if (status == -EACCES && cred == clp->cl_machine_cred) {
1247 nfs4_clear_machine_cred(clp);
1248 status = -EAGAIN;
1249 }
Benny Halevyc2e713d2009-04-01 09:21:51 -04001250 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1251 status = -EPROTONOSUPPORT;
Trond Myklebust02860012008-12-23 15:21:40 -05001252 }
1253 return status;
1254}
1255
Andy Adamson76db6d92009-04-01 09:22:38 -04001256#ifdef CONFIG_NFS_V4_1
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001257void nfs41_handle_recall_slot(struct nfs_client *clp)
1258{
1259 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1260 nfs4_schedule_state_recovery(clp);
1261}
1262
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001263static void nfs4_reset_all_state(struct nfs_client *clp)
1264{
1265 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1266 clp->cl_boot_time = CURRENT_TIME;
1267 nfs4_state_start_reclaim_nograce(clp);
1268 nfs4_schedule_state_recovery(clp);
1269 }
1270}
1271
1272static void nfs41_handle_server_reboot(struct nfs_client *clp)
1273{
1274 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1275 nfs4_state_start_reclaim_reboot(clp);
1276 nfs4_schedule_state_recovery(clp);
1277 }
1278}
1279
1280static void nfs41_handle_state_revoked(struct nfs_client *clp)
1281{
1282 /* Temporary */
1283 nfs4_reset_all_state(clp);
1284}
1285
1286static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1287{
1288 /* This will need to handle layouts too */
1289 nfs_expire_all_delegations(clp);
1290}
1291
1292static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1293{
1294 nfs_expire_all_delegations(clp);
1295 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1296 nfs4_schedule_state_recovery(clp);
1297}
1298
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001299void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1300{
1301 if (!flags)
1302 return;
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001303 else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1304 nfs41_handle_server_reboot(clp);
1305 else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001306 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1307 SEQ4_STATUS_ADMIN_STATE_REVOKED |
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001308 SEQ4_STATUS_LEASE_MOVED))
1309 nfs41_handle_state_revoked(clp);
1310 else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1311 nfs41_handle_recallable_state_revoked(clp);
1312 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001313 SEQ4_STATUS_BACKCHANNEL_FAULT |
1314 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001315 nfs41_handle_cb_path_down(clp);
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001316}
1317
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001318static int nfs4_reset_session(struct nfs_client *clp)
1319{
1320 int status;
1321
Trond Myklebust38045412009-12-15 17:36:57 -05001322 nfs4_begin_drain_session(clp);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001323 status = nfs4_proc_destroy_session(clp->cl_session);
1324 if (status && status != -NFS4ERR_BADSESSION &&
1325 status != -NFS4ERR_DEADSESSION) {
Ricardo Labiagaf4558482009-12-07 09:16:09 -05001326 status = nfs4_recovery_handle_error(clp, status);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001327 goto out;
1328 }
1329
1330 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
Trond Myklebustf26468f2009-12-05 19:32:11 -05001331 status = nfs4_proc_create_session(clp);
Andy Adamson41f54a52010-01-21 14:54:13 -05001332 if (status) {
Ricardo Labiagaf4558482009-12-07 09:16:09 -05001333 status = nfs4_recovery_handle_error(clp, status);
Andy Adamson41f54a52010-01-21 14:54:13 -05001334 goto out;
1335 }
1336 /* create_session negotiated new slot table */
1337 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -05001338
Andy Adamson41f54a52010-01-21 14:54:13 -05001339 /* Let the state manager reestablish state */
1340 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001341 nfs41_setup_state_renewal(clp);
Andy Adamson41f54a52010-01-21 14:54:13 -05001342out:
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001343 return status;
1344}
Andy Adamson76db6d92009-04-01 09:22:38 -04001345
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001346static int nfs4_recall_slot(struct nfs_client *clp)
1347{
1348 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1349 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1350 struct nfs4_slot *new, *old;
1351 int i;
1352
1353 nfs4_begin_drain_session(clp);
1354 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1355 GFP_KERNEL);
1356 if (!new)
1357 return -ENOMEM;
1358
1359 spin_lock(&fc_tbl->slot_tbl_lock);
1360 for (i = 0; i < fc_tbl->target_max_slots; i++)
1361 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1362 old = fc_tbl->slots;
1363 fc_tbl->slots = new;
1364 fc_tbl->max_slots = fc_tbl->target_max_slots;
1365 fc_tbl->target_max_slots = 0;
1366 fc_attrs->max_reqs = fc_tbl->max_slots;
1367 spin_unlock(&fc_tbl->slot_tbl_lock);
1368
1369 kfree(old);
1370 nfs4_end_drain_session(clp);
1371 return 0;
1372}
1373
Andy Adamson76db6d92009-04-01 09:22:38 -04001374#else /* CONFIG_NFS_V4_1 */
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001375static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001376static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001377static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
Andy Adamson76db6d92009-04-01 09:22:38 -04001378#endif /* CONFIG_NFS_V4_1 */
1379
Andy Adamson78722e92009-06-16 14:43:15 -04001380/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1381 * on EXCHANGE_ID for v4.1
1382 */
1383static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1384{
1385 if (nfs4_has_session(clp)) {
1386 switch (status) {
1387 case -NFS4ERR_DELAY:
1388 case -NFS4ERR_CLID_INUSE:
1389 case -EAGAIN:
Jeff Layton2c643482010-01-07 09:42:03 -05001390 case -EKEYEXPIRED:
Andy Adamson78722e92009-06-16 14:43:15 -04001391 break;
1392
1393 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1394 * in nfs4_exchange_id */
1395 default:
1396 return;
1397 }
1398 }
1399 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1400}
1401
Trond Myklebuste005e802008-12-23 15:21:48 -05001402static void nfs4_state_manager(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05001403{
Trond Myklebust02860012008-12-23 15:21:40 -05001404 int status = 0;
1405
Trond Myklebust02860012008-12-23 15:21:40 -05001406 /* Ensure exclusive access to NFSv4 state */
Trond Myklebustf3c76492008-12-23 15:21:48 -05001407 for(;;) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001408 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1409 /* We're going to have to re-establish a clientid */
1410 status = nfs4_reclaim_lease(clp);
1411 if (status) {
Andy Adamson78722e92009-06-16 14:43:15 -04001412 nfs4_set_lease_expired(clp, status);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001413 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1414 &clp->cl_state))
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001415 continue;
Andy Adamson76db6d92009-04-01 09:22:38 -04001416 if (clp->cl_cons_state ==
1417 NFS_CS_SESSION_INITING)
1418 nfs_mark_client_ready(clp, status);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001419 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 }
Trond Myklebuste598d842008-12-23 15:21:42 -05001421 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Ricardo Labiaga7cab89b2009-12-08 14:35:28 -05001422 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
Trond Myklebuste598d842008-12-23 15:21:42 -05001423 }
1424
1425 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1426 status = nfs4_check_lease(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001427 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
Trond Myklebuste598d842008-12-23 15:21:42 -05001428 continue;
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001429 if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1430 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001432
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001433 /* Initialize or reset the session */
Andy Adamson6df08182009-12-04 15:55:05 -05001434 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
Trond Myklebust7111dc72009-08-24 19:21:29 -04001435 && nfs4_has_session(clp)) {
Andy Adamson4d643d12009-12-04 15:52:24 -05001436 status = nfs4_reset_session(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001437 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1438 continue;
1439 if (status < 0)
Andy Adamson76db6d92009-04-01 09:22:38 -04001440 goto out_error;
Andy Adamson76db6d92009-04-01 09:22:38 -04001441 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001442
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001443 /* First recover reboot state... */
Trond Myklebuste345e882009-12-03 15:52:41 -05001444 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001445 status = nfs4_do_reclaim(clp,
1446 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001447 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
Andy Adamson6df08182009-12-04 15:55:05 -05001448 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001449 continue;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001450 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001451 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1452 continue;
1453 if (status < 0)
1454 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001455 }
1456
1457 /* Now recover expired state... */
1458 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001459 status = nfs4_do_reclaim(clp,
1460 nfs4_nograce_recovery_ops[clp->cl_minorversion]);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001461 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
Andy Adamson6df08182009-12-04 15:55:05 -05001462 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001463 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1464 continue;
1465 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001466 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001467 }
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001468
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001469 nfs4_end_drain_session(clp);
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001470 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1471 nfs_client_return_marked_delegations(clp);
1472 continue;
1473 }
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001474 /* Recall session slots */
1475 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1476 && nfs4_has_session(clp)) {
1477 status = nfs4_recall_slot(clp);
1478 if (status < 0)
1479 goto out_error;
1480 continue;
1481 }
1482
Trond Myklebuste005e802008-12-23 15:21:48 -05001483
1484 nfs4_clear_state_manager_bit(clp);
Trond Myklebustf3c76492008-12-23 15:21:48 -05001485 /* Did we race with an attempt to give us more work? */
1486 if (clp->cl_state == 0)
1487 break;
1488 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1489 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 }
Trond Myklebuste005e802008-12-23 15:21:48 -05001491 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492out_error:
Trond Myklebuste005e802008-12-23 15:21:48 -05001493 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
Chuck Lever5d8515c2007-12-10 14:57:16 -05001494 " with error %d\n", clp->cl_hostname, -status);
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001495 nfs4_end_drain_session(clp);
Trond Myklebuste005e802008-12-23 15:21:48 -05001496 nfs4_clear_state_manager_bit(clp);
1497}
1498
1499static int nfs4_run_state_manager(void *ptr)
1500{
1501 struct nfs_client *clp = ptr;
1502
1503 allow_signal(SIGKILL);
1504 nfs4_state_manager(clp);
1505 nfs_put_client(clp);
1506 module_put_and_exit(0);
1507 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508}
1509
1510/*
1511 * Local variables:
1512 * c-basic-offset: 8
1513 * End:
1514 */