blob: 3e4adf8c831214aaa7ef56e4abce36a3ef10d439 [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
David Howellsadfa6f92006-08-22 20:06:08 -040063static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
Trond Myklebust286d7d62006-01-03 09:55:26 +010065 int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK,
66 nfs_callback_tcpport, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 if (status == 0)
Trond Myklebust286d7d62006-01-03 09:55:26 +010068 status = nfs4_proc_setclientid_confirm(clp, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 if (status == 0)
70 nfs4_schedule_state_renewal(clp);
71 return status;
72}
73
David Howellsadfa6f92006-08-22 20:06:08 -040074struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
Trond Myklebustb4454fe2006-01-03 09:55:25 +010075{
76 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -040077 struct rb_node *pos;
Trond Myklebustb4454fe2006-01-03 09:55:25 +010078 struct rpc_cred *cred = NULL;
79
Trond Myklebust9f958ab2007-07-02 13:58:33 -040080 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
81 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustb4454fe2006-01-03 09:55:25 +010082 if (list_empty(&sp->so_states))
83 continue;
84 cred = get_rpccred(sp->so_cred);
85 break;
86 }
87 return cred;
88}
89
Trond Myklebust10afec92007-05-14 17:16:04 -040090static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
Trond Myklebust286d7d62006-01-03 09:55:26 +010091{
92 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -040093 struct rb_node *pos;
Trond Myklebust286d7d62006-01-03 09:55:26 +010094
Trond Myklebust9f958ab2007-07-02 13:58:33 -040095 pos = rb_first(&clp->cl_state_owners);
96 if (pos != NULL) {
97 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebust286d7d62006-01-03 09:55:26 +010098 return get_rpccred(sp->so_cred);
99 }
100 return NULL;
101}
102
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400103static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
104 __u64 minval, int maxbits)
105{
106 struct rb_node **p, *parent;
107 struct nfs_unique_id *pos;
108 __u64 mask = ~0ULL;
109
110 if (maxbits < 64)
111 mask = (1ULL << maxbits) - 1ULL;
112
113 /* Ensure distribution is more or less flat */
114 get_random_bytes(&new->id, sizeof(new->id));
115 new->id &= mask;
116 if (new->id < minval)
117 new->id += minval;
118retry:
119 p = &root->rb_node;
120 parent = NULL;
121
122 while (*p != NULL) {
123 parent = *p;
124 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
125
126 if (new->id < pos->id)
127 p = &(*p)->rb_left;
128 else if (new->id > pos->id)
129 p = &(*p)->rb_right;
130 else
131 goto id_exists;
132 }
133 rb_link_node(&new->rb_node, parent, p);
134 rb_insert_color(&new->rb_node, root);
135 return;
136id_exists:
137 for (;;) {
138 new->id++;
139 if (new->id < minval || (new->id & mask) != new->id) {
140 new->id = minval;
141 break;
142 }
143 parent = rb_next(parent);
144 if (parent == NULL)
145 break;
146 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
147 if (new->id < pos->id)
148 break;
149 }
150 goto retry;
151}
152
153static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
154{
155 rb_erase(&id->rb_node, root);
156}
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158static struct nfs4_state_owner *
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400159nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400161 struct nfs_client *clp = server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400162 struct rb_node **p = &clp->cl_state_owners.rb_node,
163 *parent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 struct nfs4_state_owner *sp, *res = NULL;
165
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400166 while (*p != NULL) {
167 parent = *p;
168 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
169
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400170 if (server < sp->so_server) {
171 p = &parent->rb_left;
172 continue;
173 }
174 if (server > sp->so_server) {
175 p = &parent->rb_right;
176 continue;
177 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400178 if (cred < sp->so_cred)
179 p = &parent->rb_left;
180 else if (cred > sp->so_cred)
181 p = &parent->rb_right;
182 else {
183 atomic_inc(&sp->so_count);
184 res = sp;
185 break;
186 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 }
188 return res;
189}
190
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400191static struct nfs4_state_owner *
192nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
193{
194 struct rb_node **p = &clp->cl_state_owners.rb_node,
195 *parent = NULL;
196 struct nfs4_state_owner *sp;
197
198 while (*p != NULL) {
199 parent = *p;
200 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
201
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400202 if (new->so_server < sp->so_server) {
203 p = &parent->rb_left;
204 continue;
205 }
206 if (new->so_server > sp->so_server) {
207 p = &parent->rb_right;
208 continue;
209 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400210 if (new->so_cred < sp->so_cred)
211 p = &parent->rb_left;
212 else if (new->so_cred > sp->so_cred)
213 p = &parent->rb_right;
214 else {
215 atomic_inc(&sp->so_count);
216 return sp;
217 }
218 }
219 nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
220 rb_link_node(&new->so_client_node, parent, p);
221 rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
222 return new;
223}
224
225static void
226nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
227{
228 if (!RB_EMPTY_NODE(&sp->so_client_node))
229 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
230 nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
231}
232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233/*
234 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
235 * create a new state_owner.
236 *
237 */
238static struct nfs4_state_owner *
239nfs4_alloc_state_owner(void)
240{
241 struct nfs4_state_owner *sp;
242
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700243 sp = kzalloc(sizeof(*sp),GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 if (!sp)
245 return NULL;
Trond Myklebustec073422005-10-20 14:22:47 -0700246 spin_lock_init(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 INIT_LIST_HEAD(&sp->so_states);
248 INIT_LIST_HEAD(&sp->so_delegations);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700249 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
250 sp->so_seqid.sequence = &sp->so_sequence;
251 spin_lock_init(&sp->so_sequence.lock);
252 INIT_LIST_HEAD(&sp->so_sequence.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 atomic_set(&sp->so_count, 1);
254 return sp;
255}
256
257void
258nfs4_drop_state_owner(struct nfs4_state_owner *sp)
259{
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400260 if (!RB_EMPTY_NODE(&sp->so_client_node)) {
261 struct nfs_client *clp = sp->so_client;
262
263 spin_lock(&clp->cl_lock);
264 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
265 RB_CLEAR_NODE(&sp->so_client_node);
266 spin_unlock(&clp->cl_lock);
267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268}
269
270/*
271 * Note: must be called with clp->cl_sem held in order to prevent races
272 * with reboot recovery!
273 */
274struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
275{
David Howells7539bba2006-08-22 20:06:09 -0400276 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 struct nfs4_state_owner *sp, *new;
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 spin_lock(&clp->cl_lock);
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400280 sp = nfs4_find_state_owner(server, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (sp != NULL)
283 return sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400284 new = nfs4_alloc_state_owner();
285 if (new == NULL)
286 return NULL;
287 new->so_client = clp;
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400288 new->so_server = server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400289 new->so_cred = cred;
290 spin_lock(&clp->cl_lock);
291 sp = nfs4_insert_state_owner(clp, new);
292 spin_unlock(&clp->cl_lock);
293 if (sp == new)
294 get_rpccred(cred);
295 else
296 kfree(new);
297 return sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
300/*
301 * Must be called with clp->cl_sem held in order to avoid races
302 * with state recovery...
303 */
304void nfs4_put_state_owner(struct nfs4_state_owner *sp)
305{
David Howellsadfa6f92006-08-22 20:06:08 -0400306 struct nfs_client *clp = sp->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 struct rpc_cred *cred = sp->so_cred;
308
309 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
310 return;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400311 nfs4_remove_state_owner(clp, sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 spin_unlock(&clp->cl_lock);
313 put_rpccred(cred);
314 kfree(sp);
315}
316
317static struct nfs4_state *
318nfs4_alloc_open_state(void)
319{
320 struct nfs4_state *state;
321
Trond Myklebuste7616922006-01-03 09:55:13 +0100322 state = kzalloc(sizeof(*state), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 if (!state)
324 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 atomic_set(&state->count, 1);
326 INIT_LIST_HEAD(&state->lock_states);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000327 spin_lock_init(&state->state_lock);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400328 seqlock_init(&state->seqlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 return state;
330}
331
Trond Myklebust4cecb762005-11-04 15:32:58 -0500332void
333nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode)
334{
335 if (state->state == mode)
336 return;
337 /* NB! List reordering - see the reclaim code for why. */
338 if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
339 if (mode & FMODE_WRITE)
340 list_move(&state->open_states, &state->owner->so_states);
341 else
342 list_move_tail(&state->open_states, &state->owner->so_states);
343 }
Trond Myklebust4cecb762005-11-04 15:32:58 -0500344 state->state = mode;
345}
346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347static struct nfs4_state *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
349{
350 struct nfs_inode *nfsi = NFS_I(inode);
351 struct nfs4_state *state;
352
353 list_for_each_entry(state, &nfsi->open_states, inode_states) {
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400354 if (state->owner != owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 continue;
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400356 if (atomic_inc_not_zero(&state->count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 return state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
359 return NULL;
360}
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362static void
363nfs4_free_open_state(struct nfs4_state *state)
364{
365 kfree(state);
366}
367
368struct nfs4_state *
369nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
370{
371 struct nfs4_state *state, *new;
372 struct nfs_inode *nfsi = NFS_I(inode);
373
374 spin_lock(&inode->i_lock);
375 state = __nfs4_find_state_byowner(inode, owner);
376 spin_unlock(&inode->i_lock);
377 if (state)
378 goto out;
379 new = nfs4_alloc_open_state();
Trond Myklebustec073422005-10-20 14:22:47 -0700380 spin_lock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 spin_lock(&inode->i_lock);
382 state = __nfs4_find_state_byowner(inode, owner);
383 if (state == NULL && new != NULL) {
384 state = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 state->owner = owner;
386 atomic_inc(&owner->so_count);
387 list_add(&state->inode_states, &nfsi->open_states);
388 state->inode = igrab(inode);
389 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700390 /* Note: The reclaim code dictates that we add stateless
391 * and read-only stateids to the end of the list */
392 list_add_tail(&state->open_states, &owner->so_states);
393 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 } else {
395 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700396 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 if (new)
398 nfs4_free_open_state(new);
399 }
400out:
401 return state;
402}
403
404/*
405 * Beware! Caller must be holding exactly one
Trond Myklebuste6dfa552005-10-18 14:20:13 -0700406 * reference to clp->cl_sem!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 */
408void nfs4_put_open_state(struct nfs4_state *state)
409{
410 struct inode *inode = state->inode;
411 struct nfs4_state_owner *owner = state->owner;
412
Trond Myklebustec073422005-10-20 14:22:47 -0700413 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 return;
Trond Myklebustec073422005-10-20 14:22:47 -0700415 spin_lock(&inode->i_lock);
Trond Myklebustba6830312007-07-27 10:23:05 -0400416 list_del(&state->inode_states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 list_del(&state->open_states);
Trond Myklebustec073422005-10-20 14:22:47 -0700418 spin_unlock(&inode->i_lock);
419 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 nfs4_free_open_state(state);
422 nfs4_put_state_owner(owner);
423}
424
425/*
Trond Myklebust83c9d412005-10-18 14:20:13 -0700426 * Close the current file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 */
Trond Myklebust4a35bd42007-06-05 10:31:33 -0400428void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 struct nfs4_state_owner *owner = state->owner;
Trond Myklebust003707c2007-07-05 18:07:55 -0400431 int call_close = 0;
432 int newstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 atomic_inc(&owner->so_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 /* Protect against nfs4_find_state() */
Trond Myklebustec073422005-10-20 14:22:47 -0700436 spin_lock(&owner->so_lock);
Trond Myklebuste7616922006-01-03 09:55:13 +0100437 switch (mode & (FMODE_READ | FMODE_WRITE)) {
438 case FMODE_READ:
439 state->n_rdonly--;
440 break;
441 case FMODE_WRITE:
442 state->n_wronly--;
443 break;
444 case FMODE_READ|FMODE_WRITE:
445 state->n_rdwr--;
446 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400447 newstate = FMODE_READ|FMODE_WRITE;
Trond Myklebuste7616922006-01-03 09:55:13 +0100448 if (state->n_rdwr == 0) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400449 if (state->n_rdonly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100450 newstate &= ~FMODE_READ;
Trond Myklebust003707c2007-07-05 18:07:55 -0400451 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
452 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
453 }
454 if (state->n_wronly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100455 newstate &= ~FMODE_WRITE;
Trond Myklebust003707c2007-07-05 18:07:55 -0400456 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
457 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
458 }
459 if (newstate == 0)
460 clear_bit(NFS_DELEGATED_STATE, &state->flags);
Trond Myklebuste7616922006-01-03 09:55:13 +0100461 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400462 nfs4_state_set_mode_locked(state, newstate);
Trond Myklebustec073422005-10-20 14:22:47 -0700463 spin_unlock(&owner->so_lock);
Trond Myklebust4cecb762005-11-04 15:32:58 -0500464
Trond Myklebust003707c2007-07-05 18:07:55 -0400465 if (!call_close) {
Trond Myklebustb39e6252007-06-11 23:05:07 -0400466 nfs4_put_open_state(state);
467 nfs4_put_state_owner(owner);
468 } else
469 nfs4_do_close(path, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470}
471
472/*
473 * Search the state->lock_states for an existing lock_owner
474 * that is compatible with current->files
475 */
476static struct nfs4_lock_state *
477__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
478{
479 struct nfs4_lock_state *pos;
480 list_for_each_entry(pos, &state->lock_states, ls_locks) {
481 if (pos->ls_owner != fl_owner)
482 continue;
483 atomic_inc(&pos->ls_count);
484 return pos;
485 }
486 return NULL;
487}
488
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489/*
490 * Return a compatible lock_state. If no initialized lock_state structure
491 * exists, return an uninitialized one.
492 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 */
494static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
495{
496 struct nfs4_lock_state *lsp;
David Howellsadfa6f92006-08-22 20:06:08 -0400497 struct nfs_client *clp = state->owner->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700499 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (lsp == NULL)
501 return NULL;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700502 lsp->ls_seqid.sequence = &state->owner->so_sequence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 atomic_set(&lsp->ls_count, 1);
504 lsp->ls_owner = fl_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 spin_lock(&clp->cl_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400506 nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 spin_unlock(&clp->cl_lock);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000508 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 return lsp;
510}
511
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400512static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
513{
514 struct nfs_client *clp = lsp->ls_state->owner->so_client;
515
516 spin_lock(&clp->cl_lock);
517 nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
518 spin_unlock(&clp->cl_lock);
519 kfree(lsp);
520}
521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522/*
523 * Return a compatible lock_state. If no initialized lock_state structure
524 * exists, return an uninitialized one.
525 *
Trond Myklebuste6dfa552005-10-18 14:20:13 -0700526 * The caller must be holding clp->cl_sem
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000528static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000530 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000532 for(;;) {
533 spin_lock(&state->state_lock);
534 lsp = __nfs4_find_lock_state(state, owner);
535 if (lsp != NULL)
536 break;
537 if (new != NULL) {
538 new->ls_state = state;
539 list_add(&new->ls_locks, &state->lock_states);
540 set_bit(LK_STATE_IN_USE, &state->flags);
541 lsp = new;
542 new = NULL;
543 break;
544 }
545 spin_unlock(&state->state_lock);
546 new = nfs4_alloc_lock_state(state, owner);
547 if (new == NULL)
548 return NULL;
549 }
550 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400551 if (new != NULL)
552 nfs4_free_lock_state(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 return lsp;
554}
555
556/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000557 * Release reference to lock_state, and free it if we see that
558 * it is no longer in use
559 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700560void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000561{
562 struct nfs4_state *state;
563
564 if (lsp == NULL)
565 return;
566 state = lsp->ls_state;
567 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
568 return;
569 list_del(&lsp->ls_locks);
570 if (list_empty(&state->lock_states))
571 clear_bit(LK_STATE_IN_USE, &state->flags);
572 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400573 nfs4_free_lock_state(lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000574}
575
576static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
577{
578 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
579
580 dst->fl_u.nfs4_fl.owner = lsp;
581 atomic_inc(&lsp->ls_count);
582}
583
584static void nfs4_fl_release_lock(struct file_lock *fl)
585{
586 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
587}
588
589static struct file_lock_operations nfs4_fl_lock_ops = {
590 .fl_copy_lock = nfs4_fl_copy_lock,
591 .fl_release_private = nfs4_fl_release_lock,
592};
593
594int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
595{
596 struct nfs4_lock_state *lsp;
597
598 if (fl->fl_ops != NULL)
599 return 0;
600 lsp = nfs4_get_lock_state(state, fl->fl_owner);
601 if (lsp == NULL)
602 return -ENOMEM;
603 fl->fl_u.nfs4_fl.owner = lsp;
604 fl->fl_ops = &nfs4_fl_lock_ops;
605 return 0;
606}
607
608/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 * Byte-range lock aware utility to initialize the stateid of read/write
610 * requests.
611 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000612void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000614 struct nfs4_lock_state *lsp;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400615 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400617 do {
618 seq = read_seqbegin(&state->seqlock);
619 memcpy(dst, &state->stateid, sizeof(*dst));
620 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000621 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
622 return;
623
624 spin_lock(&state->state_lock);
625 lsp = __nfs4_find_lock_state(state, fl_owner);
626 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
627 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
628 spin_unlock(&state->state_lock);
629 nfs4_put_lock_state(lsp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630}
631
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700632struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633{
Trond Myklebust36f20c62005-11-25 17:09:57 -0500634 struct rpc_sequence *sequence = counter->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700635 struct nfs_seqid *new;
636
637 new = kmalloc(sizeof(*new), GFP_KERNEL);
638 if (new != NULL) {
639 new->sequence = counter;
Trond Myklebust36f20c62005-11-25 17:09:57 -0500640 spin_lock(&sequence->lock);
641 list_add_tail(&new->list, &sequence->list);
642 spin_unlock(&sequence->lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700643 }
644 return new;
645}
646
647void nfs_free_seqid(struct nfs_seqid *seqid)
648{
649 struct rpc_sequence *sequence = seqid->sequence->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700650
Trond Myklebust36f20c62005-11-25 17:09:57 -0500651 spin_lock(&sequence->lock);
652 list_del(&seqid->list);
653 spin_unlock(&sequence->lock);
654 rpc_wake_up(&sequence->wait);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700655 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656}
657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700659 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
660 * failed with a seqid incrementing error -
661 * see comments nfs_fs.h:seqid_mutating_error()
662 */
Trond Myklebust88d90932007-07-02 14:03:03 -0400663static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664{
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700665 switch (status) {
666 case 0:
667 break;
668 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400669 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
670 return;
671 printk(KERN_WARNING "NFS: v4 server returned a bad"
672 "sequence-id error on an"
673 "unconfirmed sequence %p!\n",
674 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700675 case -NFS4ERR_STALE_CLIENTID:
676 case -NFS4ERR_STALE_STATEID:
677 case -NFS4ERR_BAD_STATEID:
678 case -NFS4ERR_BADXDR:
679 case -NFS4ERR_RESOURCE:
680 case -NFS4ERR_NOFILEHANDLE:
681 /* Non-seqid mutating errors */
682 return;
683 };
684 /*
685 * Note: no locking needed as we are guaranteed to be first
686 * on the sequence list
687 */
688 seqid->sequence->counter++;
689}
690
691void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
692{
693 if (status == -NFS4ERR_BAD_SEQID) {
694 struct nfs4_state_owner *sp = container_of(seqid->sequence,
695 struct nfs4_state_owner, so_seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 nfs4_drop_state_owner(sp);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700697 }
Trond Myklebust88d90932007-07-02 14:03:03 -0400698 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700699}
700
701/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700702 * Increment the seqid if the LOCK/LOCKU succeeded, or
703 * failed with a seqid incrementing error -
704 * see comments nfs_fs.h:seqid_mutating_error()
705 */
706void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
707{
Trond Myklebust88d90932007-07-02 14:03:03 -0400708 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700709}
710
711int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
712{
713 struct rpc_sequence *sequence = seqid->sequence->sequence;
714 int status = 0;
715
Trond Myklebust4e513362005-10-20 14:22:41 -0700716 if (sequence->list.next == &seqid->list)
717 goto out;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700718 spin_lock(&sequence->lock);
Trond Myklebust36f20c62005-11-25 17:09:57 -0500719 if (sequence->list.next != &seqid->list) {
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700720 rpc_sleep_on(&sequence->wait, task, NULL, NULL);
721 status = -EAGAIN;
Trond Myklebust36f20c62005-11-25 17:09:57 -0500722 }
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700723 spin_unlock(&sequence->lock);
Trond Myklebust4e513362005-10-20 14:22:41 -0700724out:
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700725 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726}
727
728static int reclaimer(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
David Howellsadfa6f92006-08-22 20:06:08 -0400730static inline void nfs4_clear_recover_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +0100731{
732 smp_mb__before_clear_bit();
733 clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state);
734 smp_mb__after_clear_bit();
735 wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER);
736 rpc_wake_up(&clp->cl_rpcwaitq);
737}
738
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739/*
740 * State recovery routine
741 */
David Howellsadfa6f92006-08-22 20:06:08 -0400742static void nfs4_recover_state(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
Trond Myklebust5043e902006-01-03 09:55:23 +0100744 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Trond Myklebust5043e902006-01-03 09:55:23 +0100746 __module_get(THIS_MODULE);
747 atomic_inc(&clp->cl_count);
748 task = kthread_run(reclaimer, clp, "%u.%u.%u.%u-reclaim",
David Howells24c8dbb2006-08-22 20:06:10 -0400749 NIPQUAD(clp->cl_addr.sin_addr));
Trond Myklebust5043e902006-01-03 09:55:23 +0100750 if (!IS_ERR(task))
751 return;
Trond Myklebust433fbe42006-01-03 09:55:22 +0100752 nfs4_clear_recover_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400753 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +0100754 module_put(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755}
756
757/*
758 * Schedule a state recovery attempt
759 */
David Howellsadfa6f92006-08-22 20:06:08 -0400760void nfs4_schedule_state_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
762 if (!clp)
763 return;
Trond Myklebust433fbe42006-01-03 09:55:22 +0100764 if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
Trond Myklebust5043e902006-01-03 09:55:23 +0100765 nfs4_recover_state(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766}
767
768static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state)
769{
770 struct inode *inode = state->inode;
771 struct file_lock *fl;
772 int status = 0;
773
774 for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
Trond Myklebust43b2a332005-11-04 15:35:30 -0500775 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 continue;
777 if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
778 continue;
779 status = ops->recover_lock(state, fl);
780 if (status >= 0)
781 continue;
782 switch (status) {
783 default:
784 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
785 __FUNCTION__, status);
786 case -NFS4ERR_EXPIRED:
787 case -NFS4ERR_NO_GRACE:
788 case -NFS4ERR_RECLAIM_BAD:
789 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust43b2a332005-11-04 15:35:30 -0500790 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 break;
792 case -NFS4ERR_STALE_CLIENTID:
793 goto out_err;
794 }
795 }
796 return 0;
797out_err:
798 return status;
799}
800
801static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp)
802{
803 struct nfs4_state *state;
804 struct nfs4_lock_state *lock;
805 int status = 0;
806
807 /* Note: we rely on the sp->so_states list being ordered
808 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
809 * states first.
810 * This is needed to ensure that the server won't give us any
811 * read delegations that we have to return if, say, we are
812 * recovering after a network partition or a reboot from a
813 * server that doesn't support a grace period.
814 */
815 list_for_each_entry(state, &sp->so_states, open_states) {
816 if (state->state == 0)
817 continue;
818 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 if (status >= 0) {
820 status = nfs4_reclaim_locks(ops, state);
821 if (status < 0)
822 goto out_err;
823 list_for_each_entry(lock, &state->lock_states, ls_locks) {
824 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
825 printk("%s: Lock reclaim failed!\n",
826 __FUNCTION__);
827 }
828 continue;
829 }
830 switch (status) {
831 default:
832 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
833 __FUNCTION__, status);
834 case -ENOENT:
835 case -NFS4ERR_RECLAIM_BAD:
836 case -NFS4ERR_RECLAIM_CONFLICT:
837 /*
838 * Open state on this file cannot be recovered
839 * All we can do is revert to using the zero stateid.
840 */
841 memset(state->stateid.data, 0,
842 sizeof(state->stateid.data));
843 /* Mark the file as being 'closed' */
844 state->state = 0;
845 break;
846 case -NFS4ERR_EXPIRED:
847 case -NFS4ERR_NO_GRACE:
848 case -NFS4ERR_STALE_CLIENTID:
849 goto out_err;
850 }
851 }
852 return 0;
853out_err:
854 return status;
855}
856
David Howellsadfa6f92006-08-22 20:06:08 -0400857static void nfs4_state_mark_reclaim(struct nfs_client *clp)
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700858{
859 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400860 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700861 struct nfs4_state *state;
862 struct nfs4_lock_state *lock;
863
864 /* Reset all sequence ids to zero */
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400865 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
866 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700867 sp->so_seqid.counter = 0;
868 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -0700869 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700870 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400871 clear_bit(NFS_DELEGATED_STATE, &state->flags);
872 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
873 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
874 clear_bit(NFS_O_RDWR_STATE, &state->flags);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700875 list_for_each_entry(lock, &state->lock_states, ls_locks) {
876 lock->ls_seqid.counter = 0;
877 lock->ls_seqid.flags = 0;
878 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
879 }
880 }
Trond Myklebustec073422005-10-20 14:22:47 -0700881 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700882 }
883}
884
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885static int reclaimer(void *ptr)
886{
David Howellsadfa6f92006-08-22 20:06:08 -0400887 struct nfs_client *clp = ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400889 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 struct nfs4_state_recovery_ops *ops;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100891 struct rpc_cred *cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 int status = 0;
893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 allow_signal(SIGKILL);
895
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 /* Ensure exclusive access to NFSv4 state */
897 lock_kernel();
898 down_write(&clp->cl_sem);
899 /* Are there any NFS mounts out there? */
900 if (list_empty(&clp->cl_superblocks))
901 goto out;
902restart_loop:
Trond Myklebust286d7d62006-01-03 09:55:26 +0100903 ops = &nfs4_network_partition_recovery_ops;
904 /* Are there any open files on this volume? */
905 cred = nfs4_get_renew_cred(clp);
906 if (cred != NULL) {
907 /* Yes there are: try to renew the old lease */
908 status = nfs4_proc_renew(clp, cred);
909 switch (status) {
910 case 0:
911 case -NFS4ERR_CB_PATH_DOWN:
912 put_rpccred(cred);
913 goto out;
914 case -NFS4ERR_STALE_CLIENTID:
915 case -NFS4ERR_LEASE_MOVED:
916 ops = &nfs4_reboot_recovery_ops;
917 }
918 } else {
919 /* "reboot" to ensure we clear all state on the server */
920 clp->cl_boot_time = CURRENT_TIME;
921 cred = nfs4_get_setclientid_cred(clp);
922 }
923 /* We're going to have to re-establish a clientid */
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700924 nfs4_state_mark_reclaim(clp);
Trond Myklebust286d7d62006-01-03 09:55:26 +0100925 status = -ENOENT;
926 if (cred != NULL) {
927 status = nfs4_init_client(clp, cred);
928 put_rpccred(cred);
929 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 if (status)
931 goto out_error;
932 /* Mark all delegations for reclaim */
933 nfs_delegation_mark_reclaim(clp);
934 /* Note: list is protected by exclusive lock on cl->cl_sem */
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400935 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
936 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 status = nfs4_reclaim_open_state(ops, sp);
938 if (status < 0) {
939 if (status == -NFS4ERR_NO_GRACE) {
940 ops = &nfs4_network_partition_recovery_ops;
941 status = nfs4_reclaim_open_state(ops, sp);
942 }
943 if (status == -NFS4ERR_STALE_CLIENTID)
944 goto restart_loop;
945 if (status == -NFS4ERR_EXPIRED)
946 goto restart_loop;
947 }
948 }
949 nfs_delegation_reap_unclaimed(clp);
950out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 up_write(&clp->cl_sem);
952 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 if (status == -NFS4ERR_CB_PATH_DOWN)
954 nfs_handle_cb_pathdown(clp);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100955 nfs4_clear_recover_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400956 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +0100957 module_put_and_exit(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 return 0;
959out_error:
960 printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n",
David Howells24c8dbb2006-08-22 20:06:10 -0400961 NIPQUAD(clp->cl_addr.sin_addr), -status);
Trond Myklebust51581f32006-03-20 13:44:47 -0500962 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 goto out;
964}
965
966/*
967 * Local variables:
968 * c-basic-offset: 8
969 * End:
970 */