blob: 1434080aefeb22e77896c4f2a18f26e77df535bc [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{
Chuck Leverf738f512009-03-18 20:48:06 -040065 unsigned short port;
66 int status;
67
68 port = nfs_callback_tcpport;
69 if (clp->cl_addr.ss_family == AF_INET6)
70 port = nfs_callback_tcpport6;
71
72 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 if (status == 0)
Trond Myklebust286d7d62006-01-03 09:55:26 +010074 status = nfs4_proc_setclientid_confirm(clp, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 if (status == 0)
76 nfs4_schedule_state_renewal(clp);
77 return status;
78}
79
Andy Adamsona7b72102009-04-01 09:22:46 -040080struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040081{
82 struct rpc_cred *cred = NULL;
83
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040084 if (clp->cl_machine_cred != NULL)
85 cred = get_rpccred(clp->cl_machine_cred);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040086 return cred;
87}
88
89static void nfs4_clear_machine_cred(struct nfs_client *clp)
90{
91 struct rpc_cred *cred;
92
93 spin_lock(&clp->cl_lock);
94 cred = clp->cl_machine_cred;
95 clp->cl_machine_cred = NULL;
96 spin_unlock(&clp->cl_lock);
97 if (cred != NULL)
98 put_rpccred(cred);
99}
100
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500101struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100102{
103 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400104 struct rb_node *pos;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100105 struct rpc_cred *cred = NULL;
106
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400107 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
108 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100109 if (list_empty(&sp->so_states))
110 continue;
111 cred = get_rpccred(sp->so_cred);
112 break;
113 }
114 return cred;
115}
116
Andy Adamsonb4b82602009-04-01 09:22:49 -0400117#if defined(CONFIG_NFS_V4_1)
118
119struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
120{
121 struct rpc_cred *cred;
122
123 spin_lock(&clp->cl_lock);
124 cred = nfs4_get_machine_cred_locked(clp);
125 spin_unlock(&clp->cl_lock);
126 return cred;
127}
128
129#endif /* CONFIG_NFS_V4_1 */
130
Andy Adamsona7b72102009-04-01 09:22:46 -0400131struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
Trond Myklebust286d7d62006-01-03 09:55:26 +0100132{
133 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400134 struct rb_node *pos;
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400135 struct rpc_cred *cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100136
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500137 spin_lock(&clp->cl_lock);
138 cred = nfs4_get_machine_cred_locked(clp);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400139 if (cred != NULL)
140 goto out;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400141 pos = rb_first(&clp->cl_state_owners);
142 if (pos != NULL) {
143 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400144 cred = get_rpccred(sp->so_cred);
Trond Myklebust286d7d62006-01-03 09:55:26 +0100145 }
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400146out:
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500147 spin_unlock(&clp->cl_lock);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400148 return cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100149}
150
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400151static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
152 __u64 minval, int maxbits)
153{
154 struct rb_node **p, *parent;
155 struct nfs_unique_id *pos;
156 __u64 mask = ~0ULL;
157
158 if (maxbits < 64)
159 mask = (1ULL << maxbits) - 1ULL;
160
161 /* Ensure distribution is more or less flat */
162 get_random_bytes(&new->id, sizeof(new->id));
163 new->id &= mask;
164 if (new->id < minval)
165 new->id += minval;
166retry:
167 p = &root->rb_node;
168 parent = NULL;
169
170 while (*p != NULL) {
171 parent = *p;
172 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
173
174 if (new->id < pos->id)
175 p = &(*p)->rb_left;
176 else if (new->id > pos->id)
177 p = &(*p)->rb_right;
178 else
179 goto id_exists;
180 }
181 rb_link_node(&new->rb_node, parent, p);
182 rb_insert_color(&new->rb_node, root);
183 return;
184id_exists:
185 for (;;) {
186 new->id++;
187 if (new->id < minval || (new->id & mask) != new->id) {
188 new->id = minval;
189 break;
190 }
191 parent = rb_next(parent);
192 if (parent == NULL)
193 break;
194 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
195 if (new->id < pos->id)
196 break;
197 }
198 goto retry;
199}
200
201static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
202{
203 rb_erase(&id->rb_node, root);
204}
205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206static struct nfs4_state_owner *
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400207nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400209 struct nfs_client *clp = server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400210 struct rb_node **p = &clp->cl_state_owners.rb_node,
211 *parent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 struct nfs4_state_owner *sp, *res = NULL;
213
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400214 while (*p != NULL) {
215 parent = *p;
216 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
217
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400218 if (server < sp->so_server) {
219 p = &parent->rb_left;
220 continue;
221 }
222 if (server > sp->so_server) {
223 p = &parent->rb_right;
224 continue;
225 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400226 if (cred < sp->so_cred)
227 p = &parent->rb_left;
228 else if (cred > sp->so_cred)
229 p = &parent->rb_right;
230 else {
231 atomic_inc(&sp->so_count);
232 res = sp;
233 break;
234 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 }
236 return res;
237}
238
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400239static struct nfs4_state_owner *
240nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
241{
242 struct rb_node **p = &clp->cl_state_owners.rb_node,
243 *parent = NULL;
244 struct nfs4_state_owner *sp;
245
246 while (*p != NULL) {
247 parent = *p;
248 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
249
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400250 if (new->so_server < sp->so_server) {
251 p = &parent->rb_left;
252 continue;
253 }
254 if (new->so_server > sp->so_server) {
255 p = &parent->rb_right;
256 continue;
257 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400258 if (new->so_cred < sp->so_cred)
259 p = &parent->rb_left;
260 else if (new->so_cred > sp->so_cred)
261 p = &parent->rb_right;
262 else {
263 atomic_inc(&sp->so_count);
264 return sp;
265 }
266 }
267 nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
268 rb_link_node(&new->so_client_node, parent, p);
269 rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
270 return new;
271}
272
273static void
274nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
275{
276 if (!RB_EMPTY_NODE(&sp->so_client_node))
277 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
278 nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
279}
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281/*
282 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
283 * create a new state_owner.
284 *
285 */
286static struct nfs4_state_owner *
287nfs4_alloc_state_owner(void)
288{
289 struct nfs4_state_owner *sp;
290
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700291 sp = kzalloc(sizeof(*sp),GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 if (!sp)
293 return NULL;
Trond Myklebustec073422005-10-20 14:22:47 -0700294 spin_lock_init(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 INIT_LIST_HEAD(&sp->so_states);
296 INIT_LIST_HEAD(&sp->so_delegations);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700297 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
298 sp->so_seqid.sequence = &sp->so_sequence;
299 spin_lock_init(&sp->so_sequence.lock);
300 INIT_LIST_HEAD(&sp->so_sequence.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 atomic_set(&sp->so_count, 1);
302 return sp;
303}
304
Adrian Bunk1d2e88e2008-05-02 13:42:45 -0700305static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306nfs4_drop_state_owner(struct nfs4_state_owner *sp)
307{
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400308 if (!RB_EMPTY_NODE(&sp->so_client_node)) {
309 struct nfs_client *clp = sp->so_client;
310
311 spin_lock(&clp->cl_lock);
312 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
313 RB_CLEAR_NODE(&sp->so_client_node);
314 spin_unlock(&clp->cl_lock);
315 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316}
317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
319{
David Howells7539bba2006-08-22 20:06:09 -0400320 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 struct nfs4_state_owner *sp, *new;
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 spin_lock(&clp->cl_lock);
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400324 sp = nfs4_find_state_owner(server, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 if (sp != NULL)
327 return sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400328 new = nfs4_alloc_state_owner();
329 if (new == NULL)
330 return NULL;
331 new->so_client = clp;
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400332 new->so_server = server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400333 new->so_cred = cred;
334 spin_lock(&clp->cl_lock);
335 sp = nfs4_insert_state_owner(clp, new);
336 spin_unlock(&clp->cl_lock);
337 if (sp == new)
338 get_rpccred(cred);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500339 else {
340 rpc_destroy_wait_queue(&new->so_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400341 kfree(new);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500342 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400343 return sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346void nfs4_put_state_owner(struct nfs4_state_owner *sp)
347{
David Howellsadfa6f92006-08-22 20:06:08 -0400348 struct nfs_client *clp = sp->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 struct rpc_cred *cred = sp->so_cred;
350
351 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
352 return;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400353 nfs4_remove_state_owner(clp, sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500355 rpc_destroy_wait_queue(&sp->so_sequence.wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 put_rpccred(cred);
357 kfree(sp);
358}
359
360static struct nfs4_state *
361nfs4_alloc_open_state(void)
362{
363 struct nfs4_state *state;
364
Trond Myklebuste7616922006-01-03 09:55:13 +0100365 state = kzalloc(sizeof(*state), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 if (!state)
367 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 atomic_set(&state->count, 1);
369 INIT_LIST_HEAD(&state->lock_states);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000370 spin_lock_init(&state->state_lock);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400371 seqlock_init(&state->seqlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 return state;
373}
374
Trond Myklebust4cecb762005-11-04 15:32:58 -0500375void
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500376nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500377{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500378 if (state->state == fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500379 return;
380 /* NB! List reordering - see the reclaim code for why. */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500381 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
382 if (fmode & FMODE_WRITE)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500383 list_move(&state->open_states, &state->owner->so_states);
384 else
385 list_move_tail(&state->open_states, &state->owner->so_states);
386 }
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500387 state->state = fmode;
Trond Myklebust4cecb762005-11-04 15:32:58 -0500388}
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390static struct nfs4_state *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
392{
393 struct nfs_inode *nfsi = NFS_I(inode);
394 struct nfs4_state *state;
395
396 list_for_each_entry(state, &nfsi->open_states, inode_states) {
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400397 if (state->owner != owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 continue;
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400399 if (atomic_inc_not_zero(&state->count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 return state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 }
402 return NULL;
403}
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405static void
406nfs4_free_open_state(struct nfs4_state *state)
407{
408 kfree(state);
409}
410
411struct nfs4_state *
412nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
413{
414 struct nfs4_state *state, *new;
415 struct nfs_inode *nfsi = NFS_I(inode);
416
417 spin_lock(&inode->i_lock);
418 state = __nfs4_find_state_byowner(inode, owner);
419 spin_unlock(&inode->i_lock);
420 if (state)
421 goto out;
422 new = nfs4_alloc_open_state();
Trond Myklebustec073422005-10-20 14:22:47 -0700423 spin_lock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 spin_lock(&inode->i_lock);
425 state = __nfs4_find_state_byowner(inode, owner);
426 if (state == NULL && new != NULL) {
427 state = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 state->owner = owner;
429 atomic_inc(&owner->so_count);
430 list_add(&state->inode_states, &nfsi->open_states);
431 state->inode = igrab(inode);
432 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700433 /* Note: The reclaim code dictates that we add stateless
434 * and read-only stateids to the end of the list */
435 list_add_tail(&state->open_states, &owner->so_states);
436 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 } else {
438 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700439 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 if (new)
441 nfs4_free_open_state(new);
442 }
443out:
444 return state;
445}
446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447void nfs4_put_open_state(struct nfs4_state *state)
448{
449 struct inode *inode = state->inode;
450 struct nfs4_state_owner *owner = state->owner;
451
Trond Myklebustec073422005-10-20 14:22:47 -0700452 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 return;
Trond Myklebustec073422005-10-20 14:22:47 -0700454 spin_lock(&inode->i_lock);
Trond Myklebustba683032007-07-27 10:23:05 -0400455 list_del(&state->inode_states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 list_del(&state->open_states);
Trond Myklebustec073422005-10-20 14:22:47 -0700457 spin_unlock(&inode->i_lock);
458 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 nfs4_free_open_state(state);
461 nfs4_put_state_owner(owner);
462}
463
464/*
Trond Myklebust83c9d412005-10-18 14:20:13 -0700465 * Close the current file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500467static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 struct nfs4_state_owner *owner = state->owner;
Trond Myklebust003707c2007-07-05 18:07:55 -0400470 int call_close = 0;
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500471 fmode_t newstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473 atomic_inc(&owner->so_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 /* Protect against nfs4_find_state() */
Trond Myklebustec073422005-10-20 14:22:47 -0700475 spin_lock(&owner->so_lock);
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500476 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100477 case FMODE_READ:
478 state->n_rdonly--;
479 break;
480 case FMODE_WRITE:
481 state->n_wronly--;
482 break;
483 case FMODE_READ|FMODE_WRITE:
484 state->n_rdwr--;
485 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400486 newstate = FMODE_READ|FMODE_WRITE;
Trond Myklebuste7616922006-01-03 09:55:13 +0100487 if (state->n_rdwr == 0) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400488 if (state->n_rdonly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100489 newstate &= ~FMODE_READ;
Trond Myklebust003707c2007-07-05 18:07:55 -0400490 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
491 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
492 }
493 if (state->n_wronly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100494 newstate &= ~FMODE_WRITE;
Trond Myklebust003707c2007-07-05 18:07:55 -0400495 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
496 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
497 }
498 if (newstate == 0)
499 clear_bit(NFS_DELEGATED_STATE, &state->flags);
Trond Myklebuste7616922006-01-03 09:55:13 +0100500 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400501 nfs4_state_set_mode_locked(state, newstate);
Trond Myklebustec073422005-10-20 14:22:47 -0700502 spin_unlock(&owner->so_lock);
Trond Myklebust4cecb762005-11-04 15:32:58 -0500503
Trond Myklebust003707c2007-07-05 18:07:55 -0400504 if (!call_close) {
Trond Myklebustb39e6252007-06-11 23:05:07 -0400505 nfs4_put_open_state(state);
506 nfs4_put_state_owner(owner);
507 } else
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400508 nfs4_do_close(path, state, wait);
509}
510
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500511void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400512{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500513 __nfs4_close(path, state, fmode, 0);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400514}
515
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500516void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400517{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500518 __nfs4_close(path, state, fmode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519}
520
521/*
522 * Search the state->lock_states for an existing lock_owner
523 * that is compatible with current->files
524 */
525static struct nfs4_lock_state *
526__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
527{
528 struct nfs4_lock_state *pos;
529 list_for_each_entry(pos, &state->lock_states, ls_locks) {
530 if (pos->ls_owner != fl_owner)
531 continue;
532 atomic_inc(&pos->ls_count);
533 return pos;
534 }
535 return NULL;
536}
537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538/*
539 * Return a compatible lock_state. If no initialized lock_state structure
540 * exists, return an uninitialized one.
541 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 */
543static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
544{
545 struct nfs4_lock_state *lsp;
David Howellsadfa6f92006-08-22 20:06:08 -0400546 struct nfs_client *clp = state->owner->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700548 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 if (lsp == NULL)
550 return NULL;
Trond Myklebustd0dc3702008-01-10 16:07:54 -0500551 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
552 spin_lock_init(&lsp->ls_sequence.lock);
553 INIT_LIST_HEAD(&lsp->ls_sequence.list);
554 lsp->ls_seqid.sequence = &lsp->ls_sequence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 atomic_set(&lsp->ls_count, 1);
Trond Myklebustb64aec82009-07-21 16:47:46 -0400556 lsp->ls_state = state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 lsp->ls_owner = fl_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 spin_lock(&clp->cl_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400559 nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 spin_unlock(&clp->cl_lock);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000561 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 return lsp;
563}
564
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400565static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
566{
567 struct nfs_client *clp = lsp->ls_state->owner->so_client;
568
569 spin_lock(&clp->cl_lock);
570 nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
571 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500572 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400573 kfree(lsp);
574}
575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576/*
577 * Return a compatible lock_state. If no initialized lock_state structure
578 * exists, return an uninitialized one.
579 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000581static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000583 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000585 for(;;) {
586 spin_lock(&state->state_lock);
587 lsp = __nfs4_find_lock_state(state, owner);
588 if (lsp != NULL)
589 break;
590 if (new != NULL) {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000591 list_add(&new->ls_locks, &state->lock_states);
592 set_bit(LK_STATE_IN_USE, &state->flags);
593 lsp = new;
594 new = NULL;
595 break;
596 }
597 spin_unlock(&state->state_lock);
598 new = nfs4_alloc_lock_state(state, owner);
599 if (new == NULL)
600 return NULL;
601 }
602 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400603 if (new != NULL)
604 nfs4_free_lock_state(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 return lsp;
606}
607
608/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000609 * Release reference to lock_state, and free it if we see that
610 * it is no longer in use
611 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700612void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000613{
614 struct nfs4_state *state;
615
616 if (lsp == NULL)
617 return;
618 state = lsp->ls_state;
619 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
620 return;
621 list_del(&lsp->ls_locks);
622 if (list_empty(&state->lock_states))
623 clear_bit(LK_STATE_IN_USE, &state->flags);
624 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400625 nfs4_free_lock_state(lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000626}
627
628static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
629{
630 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
631
632 dst->fl_u.nfs4_fl.owner = lsp;
633 atomic_inc(&lsp->ls_count);
634}
635
636static void nfs4_fl_release_lock(struct file_lock *fl)
637{
638 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
639}
640
641static struct file_lock_operations nfs4_fl_lock_ops = {
642 .fl_copy_lock = nfs4_fl_copy_lock,
643 .fl_release_private = nfs4_fl_release_lock,
644};
645
646int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
647{
648 struct nfs4_lock_state *lsp;
649
650 if (fl->fl_ops != NULL)
651 return 0;
652 lsp = nfs4_get_lock_state(state, fl->fl_owner);
653 if (lsp == NULL)
654 return -ENOMEM;
655 fl->fl_u.nfs4_fl.owner = lsp;
656 fl->fl_ops = &nfs4_fl_lock_ops;
657 return 0;
658}
659
660/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 * Byte-range lock aware utility to initialize the stateid of read/write
662 * requests.
663 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000664void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000666 struct nfs4_lock_state *lsp;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400667 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400669 do {
670 seq = read_seqbegin(&state->seqlock);
671 memcpy(dst, &state->stateid, sizeof(*dst));
672 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000673 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
674 return;
675
676 spin_lock(&state->state_lock);
677 lsp = __nfs4_find_lock_state(state, fl_owner);
678 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
679 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
680 spin_unlock(&state->state_lock);
681 nfs4_put_lock_state(lsp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700684struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685{
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700686 struct nfs_seqid *new;
687
688 new = kmalloc(sizeof(*new), GFP_KERNEL);
689 if (new != NULL) {
690 new->sequence = counter;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500691 INIT_LIST_HEAD(&new->list);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700692 }
693 return new;
694}
695
696void nfs_free_seqid(struct nfs_seqid *seqid)
697{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500698 if (!list_empty(&seqid->list)) {
699 struct rpc_sequence *sequence = seqid->sequence->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700700
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500701 spin_lock(&sequence->lock);
702 list_del(&seqid->list);
703 spin_unlock(&sequence->lock);
704 rpc_wake_up(&sequence->wait);
705 }
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700706 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700710 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
711 * failed with a seqid incrementing error -
712 * see comments nfs_fs.h:seqid_mutating_error()
713 */
Trond Myklebust88d90932007-07-02 14:03:03 -0400714static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500716 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700717 switch (status) {
718 case 0:
719 break;
720 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400721 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
722 return;
723 printk(KERN_WARNING "NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -0800724 " sequence-id error on an"
725 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400726 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700727 case -NFS4ERR_STALE_CLIENTID:
728 case -NFS4ERR_STALE_STATEID:
729 case -NFS4ERR_BAD_STATEID:
730 case -NFS4ERR_BADXDR:
731 case -NFS4ERR_RESOURCE:
732 case -NFS4ERR_NOFILEHANDLE:
733 /* Non-seqid mutating errors */
734 return;
735 };
736 /*
737 * Note: no locking needed as we are guaranteed to be first
738 * on the sequence list
739 */
740 seqid->sequence->counter++;
741}
742
743void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
744{
Benny Halevy34dc1ad2009-04-01 09:22:52 -0400745 struct nfs4_state_owner *sp = container_of(seqid->sequence,
746 struct nfs4_state_owner, so_seqid);
747 struct nfs_server *server = sp->so_server;
748
749 if (status == -NFS4ERR_BAD_SEQID)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 nfs4_drop_state_owner(sp);
Benny Halevy34dc1ad2009-04-01 09:22:52 -0400751 if (!nfs4_has_session(server->nfs_client))
752 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700753}
754
755/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700756 * Increment the seqid if the LOCK/LOCKU succeeded, or
757 * failed with a seqid incrementing error -
758 * see comments nfs_fs.h:seqid_mutating_error()
759 */
760void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
761{
Trond Myklebust88d90932007-07-02 14:03:03 -0400762 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700763}
764
765int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
766{
767 struct rpc_sequence *sequence = seqid->sequence->sequence;
768 int status = 0;
769
770 spin_lock(&sequence->lock);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500771 if (list_empty(&seqid->list))
772 list_add_tail(&seqid->list, &sequence->list);
773 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
774 goto unlock;
Trond Myklebust5d008372008-02-22 16:34:17 -0500775 rpc_sleep_on(&sequence->wait, task, NULL);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500776 status = -EAGAIN;
777unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700778 spin_unlock(&sequence->lock);
779 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780}
781
Trond Myklebuste005e802008-12-23 15:21:48 -0500782static int nfs4_run_state_manager(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Trond Myklebuste005e802008-12-23 15:21:48 -0500784static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +0100785{
786 smp_mb__before_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -0500787 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100788 smp_mb__after_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -0500789 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100790 rpc_wake_up(&clp->cl_rpcwaitq);
791}
792
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793/*
Trond Myklebuste005e802008-12-23 15:21:48 -0500794 * Schedule the nfs_client asynchronous state management routine
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 */
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500796void nfs4_schedule_state_manager(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797{
Trond Myklebust5043e902006-01-03 09:55:23 +0100798 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Trond Myklebuste005e802008-12-23 15:21:48 -0500800 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
801 return;
Trond Myklebust5043e902006-01-03 09:55:23 +0100802 __module_get(THIS_MODULE);
803 atomic_inc(&clp->cl_count);
Trond Myklebuste005e802008-12-23 15:21:48 -0500804 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
Chuck Lever5d8515c2007-12-10 14:57:16 -0500805 rpc_peeraddr2str(clp->cl_rpcclient,
806 RPC_DISPLAY_ADDR));
Trond Myklebust5043e902006-01-03 09:55:23 +0100807 if (!IS_ERR(task))
808 return;
Trond Myklebuste005e802008-12-23 15:21:48 -0500809 nfs4_clear_state_manager_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400810 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +0100811 module_put(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812}
813
814/*
815 * Schedule a state recovery attempt
816 */
David Howellsadfa6f92006-08-22 20:06:08 -0400817void nfs4_schedule_state_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818{
819 if (!clp)
820 return;
Trond Myklebuste598d842008-12-23 15:21:42 -0500821 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
822 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Trond Myklebuste005e802008-12-23 15:21:48 -0500823 nfs4_schedule_state_manager(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
825
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500826static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
827{
828
829 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
830 /* Don't recover state that expired before the reboot */
831 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
832 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
833 return 0;
834 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -0500835 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500836 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
837 return 1;
838}
839
Trond Myklebust9e33bed2008-12-23 15:21:46 -0500840int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500841{
842 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
843 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
Trond Myklebust7eff03a2008-12-23 15:21:43 -0500844 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500845 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
846 return 1;
847}
848
Trond Myklebust02860012008-12-23 15:21:40 -0500849static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850{
851 struct inode *inode = state->inode;
Trond Myklebust19e03c52008-12-23 15:21:44 -0500852 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 struct file_lock *fl;
854 int status = 0;
855
Trond Myklebust3f09df72009-06-17 13:23:00 -0700856 if (inode->i_flock == NULL)
857 return 0;
858
859 /* Guard against delegation returns and new lock/unlock calls */
Trond Myklebust19e03c52008-12-23 15:21:44 -0500860 down_write(&nfsi->rwsem);
Trond Myklebust3f09df72009-06-17 13:23:00 -0700861 /* Protect inode->i_flock using the BKL */
862 lock_kernel();
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800863 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
Trond Myklebust43b2a332005-11-04 15:35:30 -0500864 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 continue;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400866 if (nfs_file_open_context(fl->fl_file)->state != state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 continue;
Trond Myklebust3f09df72009-06-17 13:23:00 -0700868 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 status = ops->recover_lock(state, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 switch (status) {
Trond Myklebust965b5d62009-06-17 13:22:59 -0700871 case 0:
872 break;
873 case -ESTALE:
874 case -NFS4ERR_ADMIN_REVOKED:
875 case -NFS4ERR_STALE_STATEID:
876 case -NFS4ERR_BAD_STATEID:
877 case -NFS4ERR_EXPIRED:
878 case -NFS4ERR_NO_GRACE:
879 case -NFS4ERR_STALE_CLIENTID:
880 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 default:
882 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700883 __func__, status);
Trond Myklebust965b5d62009-06-17 13:22:59 -0700884 case -ENOMEM:
885 case -NFS4ERR_DENIED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 case -NFS4ERR_RECLAIM_BAD:
887 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust43b2a332005-11-04 15:35:30 -0500888 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
Trond Myklebust965b5d62009-06-17 13:22:59 -0700889 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 }
Trond Myklebust3f09df72009-06-17 13:23:00 -0700891 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 }
Trond Myklebust3f09df72009-06-17 13:23:00 -0700893 unlock_kernel();
Trond Myklebust965b5d62009-06-17 13:22:59 -0700894out:
Trond Myklebust19e03c52008-12-23 15:21:44 -0500895 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 return status;
897}
898
Trond Myklebust02860012008-12-23 15:21:40 -0500899static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
901 struct nfs4_state *state;
902 struct nfs4_lock_state *lock;
903 int status = 0;
904
905 /* Note: we rely on the sp->so_states list being ordered
906 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
907 * states first.
908 * This is needed to ensure that the server won't give us any
909 * read delegations that we have to return if, say, we are
910 * recovering after a network partition or a reboot from a
911 * server that doesn't support a grace period.
912 */
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500913restart:
914 spin_lock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500916 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
917 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 if (state->state == 0)
919 continue;
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500920 atomic_inc(&state->count);
921 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 if (status >= 0) {
Trond Myklebust02860012008-12-23 15:21:40 -0500924 status = nfs4_reclaim_locks(state, ops);
925 if (status >= 0) {
926 list_for_each_entry(lock, &state->lock_states, ls_locks) {
927 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
928 printk("%s: Lock reclaim failed!\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700929 __func__);
Trond Myklebust02860012008-12-23 15:21:40 -0500930 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500931 nfs4_put_open_state(state);
932 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 }
935 switch (status) {
936 default:
937 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700938 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 case -ENOENT:
Trond Myklebust965b5d62009-06-17 13:22:59 -0700940 case -ENOMEM:
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500941 case -ESTALE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 /*
943 * Open state on this file cannot be recovered
944 * All we can do is revert to using the zero stateid.
945 */
946 memset(state->stateid.data, 0,
947 sizeof(state->stateid.data));
948 /* Mark the file as being 'closed' */
949 state->state = 0;
950 break;
Trond Myklebust965b5d62009-06-17 13:22:59 -0700951 case -NFS4ERR_ADMIN_REVOKED:
952 case -NFS4ERR_STALE_STATEID:
953 case -NFS4ERR_BAD_STATEID:
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500954 case -NFS4ERR_RECLAIM_BAD:
955 case -NFS4ERR_RECLAIM_CONFLICT:
956 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
957 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 case -NFS4ERR_EXPIRED:
959 case -NFS4ERR_NO_GRACE:
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500960 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 case -NFS4ERR_STALE_CLIENTID:
962 goto out_err;
963 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500964 nfs4_put_open_state(state);
965 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500967 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 return 0;
969out_err:
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500970 nfs4_put_open_state(state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 return status;
972}
973
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500974static void nfs4_clear_open_state(struct nfs4_state *state)
975{
976 struct nfs4_lock_state *lock;
977
978 clear_bit(NFS_DELEGATED_STATE, &state->flags);
979 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
980 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
981 clear_bit(NFS_O_RDWR_STATE, &state->flags);
982 list_for_each_entry(lock, &state->lock_states, ls_locks) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500983 lock->ls_seqid.flags = 0;
984 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
985 }
986}
987
988static 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 -0700989{
990 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400991 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700992 struct nfs4_state *state;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700993
994 /* Reset all sequence ids to zero */
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400995 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
996 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700997 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -0700998 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700999 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001000 if (mark_reclaim(clp, state))
1001 nfs4_clear_open_state(state);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001002 }
Trond Myklebustec073422005-10-20 14:22:47 -07001003 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001004 }
1005}
1006
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001007static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1008{
1009 /* Mark all delegations for reclaim */
1010 nfs_delegation_mark_reclaim(clp);
1011 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1012}
1013
1014static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1015{
1016 struct nfs4_state_owner *sp;
1017 struct rb_node *pos;
1018 struct nfs4_state *state;
1019
1020 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1021 return;
1022
1023 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1024 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1025 spin_lock(&sp->so_lock);
1026 list_for_each_entry(state, &sp->so_states, open_states) {
1027 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
1028 continue;
1029 nfs4_state_mark_reclaim_nograce(clp, state);
1030 }
1031 spin_unlock(&sp->so_lock);
1032 }
1033
1034 nfs_delegation_reap_unclaimed(clp);
1035}
1036
1037static void nfs_delegation_clear_all(struct nfs_client *clp)
1038{
1039 nfs_delegation_mark_reclaim(clp);
1040 nfs_delegation_reap_unclaimed(clp);
1041}
1042
1043static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1044{
1045 nfs_delegation_clear_all(clp);
1046 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1047}
1048
1049static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp)
1050{
1051 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1052}
1053
Trond Myklebuste598d842008-12-23 15:21:42 -05001054static void nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1055{
1056 switch (error) {
1057 case -NFS4ERR_CB_PATH_DOWN:
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001058 nfs_handle_cb_pathdown(clp);
Trond Myklebuste598d842008-12-23 15:21:42 -05001059 break;
1060 case -NFS4ERR_STALE_CLIENTID:
1061 case -NFS4ERR_LEASE_MOVED:
1062 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1063 nfs4_state_start_reclaim_reboot(clp);
1064 break;
1065 case -NFS4ERR_EXPIRED:
1066 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1067 nfs4_state_start_reclaim_nograce(clp);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001068 case -NFS4ERR_BADSESSION:
1069 case -NFS4ERR_BADSLOT:
1070 case -NFS4ERR_BAD_HIGH_SLOT:
1071 case -NFS4ERR_DEADSESSION:
1072 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1073 case -NFS4ERR_SEQ_FALSE_RETRY:
1074 case -NFS4ERR_SEQ_MISORDERED:
1075 set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
Trond Myklebuste598d842008-12-23 15:21:42 -05001076 }
1077}
1078
Trond Myklebust02860012008-12-23 15:21:40 -05001079static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080{
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001081 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 int status = 0;
1083
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001084restart:
1085 spin_lock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001086 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1087 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001088 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1089 continue;
1090 atomic_inc(&sp->so_count);
1091 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001092 status = nfs4_reclaim_open_state(sp, ops);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001093 if (status < 0) {
1094 set_bit(ops->owner_flag_bit, &sp->so_flags);
1095 nfs4_put_state_owner(sp);
1096 nfs4_recovery_handle_error(clp, status);
1097 return status;
1098 }
1099 nfs4_put_state_owner(sp);
1100 goto restart;
Trond Myklebust02860012008-12-23 15:21:40 -05001101 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001102 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001103 return status;
1104}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
Trond Myklebust02860012008-12-23 15:21:40 -05001106static int nfs4_check_lease(struct nfs_client *clp)
1107{
1108 struct rpc_cred *cred;
Benny Halevy8e69514f2009-04-01 09:22:45 -04001109 struct nfs4_state_maintenance_ops *ops =
1110 nfs4_state_renewal_ops[clp->cl_minorversion];
Trond Myklebust02860012008-12-23 15:21:40 -05001111 int status = -NFS4ERR_EXPIRED;
1112
Trond Myklebust0f605b52008-12-23 15:21:42 -05001113 /* Is the client already known to have an expired lease? */
1114 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1115 return 0;
Andy Adamsona7b72102009-04-01 09:22:46 -04001116 spin_lock(&clp->cl_lock);
1117 cred = ops->get_state_renewal_cred_locked(clp);
1118 spin_unlock(&clp->cl_lock);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001119 if (cred == NULL) {
1120 cred = nfs4_get_setclientid_cred(clp);
1121 if (cred == NULL)
1122 goto out;
Trond Myklebust02860012008-12-23 15:21:40 -05001123 }
Benny Halevy8e69514f2009-04-01 09:22:45 -04001124 status = ops->renew_lease(clp, cred);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001125 put_rpccred(cred);
1126out:
1127 nfs4_recovery_handle_error(clp, status);
Trond Myklebust02860012008-12-23 15:21:40 -05001128 return status;
1129}
1130
1131static int nfs4_reclaim_lease(struct nfs_client *clp)
1132{
1133 struct rpc_cred *cred;
Andy Adamson591d71c2009-04-01 09:22:47 -04001134 struct nfs4_state_recovery_ops *ops =
1135 nfs4_reboot_recovery_ops[clp->cl_minorversion];
Trond Myklebust02860012008-12-23 15:21:40 -05001136 int status = -ENOENT;
1137
Andy Adamson90a16612009-04-01 09:22:48 -04001138 cred = ops->get_clid_cred(clp);
Trond Myklebust02860012008-12-23 15:21:40 -05001139 if (cred != NULL) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001140 status = ops->establish_clid(clp, cred);
Trond Myklebust02860012008-12-23 15:21:40 -05001141 put_rpccred(cred);
1142 /* Handle case where the user hasn't set up machine creds */
1143 if (status == -EACCES && cred == clp->cl_machine_cred) {
1144 nfs4_clear_machine_cred(clp);
1145 status = -EAGAIN;
1146 }
Benny Halevyc2e713d2009-04-01 09:21:51 -04001147 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1148 status = -EPROTONOSUPPORT;
Trond Myklebust02860012008-12-23 15:21:40 -05001149 }
1150 return status;
1151}
1152
Andy Adamson76db6d92009-04-01 09:22:38 -04001153#ifdef CONFIG_NFS_V4_1
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001154static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)
1155{
1156 switch (err) {
1157 case -NFS4ERR_STALE_CLIENTID:
1158 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1159 set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
1160 }
1161}
1162
1163static int nfs4_reset_session(struct nfs_client *clp)
1164{
1165 int status;
1166
1167 status = nfs4_proc_destroy_session(clp->cl_session);
1168 if (status && status != -NFS4ERR_BADSESSION &&
1169 status != -NFS4ERR_DEADSESSION) {
1170 nfs4_session_recovery_handle_error(clp, status);
1171 goto out;
1172 }
1173
1174 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1175 status = nfs4_proc_create_session(clp, 1);
1176 if (status)
1177 nfs4_session_recovery_handle_error(clp, status);
1178 /* fall through*/
1179out:
1180 /* Wake up the next rpc task even on error */
1181 rpc_wake_up_next(&clp->cl_session->fc_slot_table.slot_tbl_waitq);
1182 return status;
1183}
Andy Adamson76db6d92009-04-01 09:22:38 -04001184
1185static int nfs4_initialize_session(struct nfs_client *clp)
1186{
1187 int status;
1188
1189 status = nfs4_proc_create_session(clp, 0);
1190 if (!status) {
1191 nfs_mark_client_ready(clp, NFS_CS_READY);
1192 } else if (status == -NFS4ERR_STALE_CLIENTID) {
1193 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1194 set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
1195 } else {
1196 nfs_mark_client_ready(clp, status);
1197 }
1198 return status;
1199}
1200#else /* CONFIG_NFS_V4_1 */
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001201static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
Andy Adamson76db6d92009-04-01 09:22:38 -04001202static int nfs4_initialize_session(struct nfs_client *clp) { return 0; }
1203#endif /* CONFIG_NFS_V4_1 */
1204
Andy Adamson78722e92009-06-16 14:43:15 -04001205/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1206 * on EXCHANGE_ID for v4.1
1207 */
1208static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1209{
1210 if (nfs4_has_session(clp)) {
1211 switch (status) {
1212 case -NFS4ERR_DELAY:
1213 case -NFS4ERR_CLID_INUSE:
1214 case -EAGAIN:
1215 break;
1216
1217 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1218 * in nfs4_exchange_id */
1219 default:
1220 return;
1221 }
1222 }
1223 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1224}
1225
Trond Myklebuste005e802008-12-23 15:21:48 -05001226static void nfs4_state_manager(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05001227{
Trond Myklebust02860012008-12-23 15:21:40 -05001228 int status = 0;
1229
Trond Myklebust02860012008-12-23 15:21:40 -05001230 /* Ensure exclusive access to NFSv4 state */
Trond Myklebustf3c76492008-12-23 15:21:48 -05001231 for(;;) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001232 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1233 /* We're going to have to re-establish a clientid */
1234 status = nfs4_reclaim_lease(clp);
1235 if (status) {
Andy Adamson78722e92009-06-16 14:43:15 -04001236 nfs4_set_lease_expired(clp, status);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001237 if (status == -EAGAIN)
1238 continue;
Andy Adamson76db6d92009-04-01 09:22:38 -04001239 if (clp->cl_cons_state ==
1240 NFS_CS_SESSION_INITING)
1241 nfs_mark_client_ready(clp, status);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001242 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 }
Trond Myklebuste598d842008-12-23 15:21:42 -05001244 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1245 }
1246
1247 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1248 status = nfs4_check_lease(clp);
1249 if (status != 0)
1250 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 }
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001252 /* Initialize or reset the session */
Trond Myklebust7111dc72009-08-24 19:21:29 -04001253 if (test_and_clear_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)
1254 && nfs4_has_session(clp)) {
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001255 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1256 status = nfs4_initialize_session(clp);
1257 else
1258 status = nfs4_reset_session(clp);
Andy Adamson76db6d92009-04-01 09:22:38 -04001259 if (status) {
1260 if (status == -NFS4ERR_STALE_CLIENTID)
1261 continue;
1262 goto out_error;
1263 }
1264 }
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001265 /* First recover reboot state... */
1266 if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001267 status = nfs4_do_reclaim(clp,
1268 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
Trond Myklebuste598d842008-12-23 15:21:42 -05001269 if (status == -NFS4ERR_STALE_CLIENTID)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001270 continue;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001271 if (test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
1272 continue;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001273 nfs4_state_end_reclaim_reboot(clp);
1274 continue;
1275 }
1276
1277 /* Now recover expired state... */
1278 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001279 status = nfs4_do_reclaim(clp,
1280 nfs4_nograce_recovery_ops[clp->cl_minorversion]);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001281 if (status < 0) {
1282 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1283 if (status == -NFS4ERR_STALE_CLIENTID)
1284 continue;
1285 if (status == -NFS4ERR_EXPIRED)
1286 continue;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001287 if (test_bit(NFS4CLNT_SESSION_SETUP,
1288 &clp->cl_state))
1289 continue;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001290 goto out_error;
1291 } else
1292 nfs4_state_end_reclaim_nograce(clp);
1293 continue;
1294 }
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001295
1296 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1297 nfs_client_return_marked_delegations(clp);
1298 continue;
1299 }
Trond Myklebuste005e802008-12-23 15:21:48 -05001300
1301 nfs4_clear_state_manager_bit(clp);
Trond Myklebustf3c76492008-12-23 15:21:48 -05001302 /* Did we race with an attempt to give us more work? */
1303 if (clp->cl_state == 0)
1304 break;
1305 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1306 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 }
Trond Myklebuste005e802008-12-23 15:21:48 -05001308 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309out_error:
Trond Myklebuste005e802008-12-23 15:21:48 -05001310 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
Chuck Lever5d8515c2007-12-10 14:57:16 -05001311 " with error %d\n", clp->cl_hostname, -status);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001312 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1313 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebuste005e802008-12-23 15:21:48 -05001314 nfs4_clear_state_manager_bit(clp);
1315}
1316
1317static int nfs4_run_state_manager(void *ptr)
1318{
1319 struct nfs_client *clp = ptr;
1320
1321 allow_signal(SIGKILL);
1322 nfs4_state_manager(clp);
1323 nfs_put_client(clp);
1324 module_put_and_exit(0);
1325 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326}
1327
1328/*
1329 * Local variables:
1330 * c-basic-offset: 8
1331 * End:
1332 */