blob: b962397004c18aba751c395add7e6dc3e397b28b [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 Myklebusta49c3c72007-10-18 18:03:27 -0400428static void __nfs4_close(struct path *path, struct nfs4_state *state, mode_t mode, int wait)
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
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400469 nfs4_do_close(path, state, wait);
470}
471
472void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
473{
474 __nfs4_close(path, state, mode, 0);
475}
476
477void nfs4_close_sync(struct path *path, struct nfs4_state *state, mode_t mode)
478{
479 __nfs4_close(path, state, mode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
482/*
483 * Search the state->lock_states for an existing lock_owner
484 * that is compatible with current->files
485 */
486static struct nfs4_lock_state *
487__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
488{
489 struct nfs4_lock_state *pos;
490 list_for_each_entry(pos, &state->lock_states, ls_locks) {
491 if (pos->ls_owner != fl_owner)
492 continue;
493 atomic_inc(&pos->ls_count);
494 return pos;
495 }
496 return NULL;
497}
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499/*
500 * Return a compatible lock_state. If no initialized lock_state structure
501 * exists, return an uninitialized one.
502 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 */
504static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
505{
506 struct nfs4_lock_state *lsp;
David Howellsadfa6f92006-08-22 20:06:08 -0400507 struct nfs_client *clp = state->owner->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700509 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 if (lsp == NULL)
511 return NULL;
Trond Myklebustd0dc3702008-01-10 16:07:54 -0500512 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
513 spin_lock_init(&lsp->ls_sequence.lock);
514 INIT_LIST_HEAD(&lsp->ls_sequence.list);
515 lsp->ls_seqid.sequence = &lsp->ls_sequence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 atomic_set(&lsp->ls_count, 1);
517 lsp->ls_owner = fl_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 spin_lock(&clp->cl_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400519 nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 spin_unlock(&clp->cl_lock);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000521 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 return lsp;
523}
524
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400525static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
526{
527 struct nfs_client *clp = lsp->ls_state->owner->so_client;
528
529 spin_lock(&clp->cl_lock);
530 nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
531 spin_unlock(&clp->cl_lock);
532 kfree(lsp);
533}
534
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535/*
536 * Return a compatible lock_state. If no initialized lock_state structure
537 * exists, return an uninitialized one.
538 *
Trond Myklebuste6dfa552005-10-18 14:20:13 -0700539 * The caller must be holding clp->cl_sem
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000541static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000543 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000545 for(;;) {
546 spin_lock(&state->state_lock);
547 lsp = __nfs4_find_lock_state(state, owner);
548 if (lsp != NULL)
549 break;
550 if (new != NULL) {
551 new->ls_state = state;
552 list_add(&new->ls_locks, &state->lock_states);
553 set_bit(LK_STATE_IN_USE, &state->flags);
554 lsp = new;
555 new = NULL;
556 break;
557 }
558 spin_unlock(&state->state_lock);
559 new = nfs4_alloc_lock_state(state, owner);
560 if (new == NULL)
561 return NULL;
562 }
563 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400564 if (new != NULL)
565 nfs4_free_lock_state(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 return lsp;
567}
568
569/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000570 * Release reference to lock_state, and free it if we see that
571 * it is no longer in use
572 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700573void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000574{
575 struct nfs4_state *state;
576
577 if (lsp == NULL)
578 return;
579 state = lsp->ls_state;
580 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
581 return;
582 list_del(&lsp->ls_locks);
583 if (list_empty(&state->lock_states))
584 clear_bit(LK_STATE_IN_USE, &state->flags);
585 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400586 nfs4_free_lock_state(lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000587}
588
589static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
590{
591 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
592
593 dst->fl_u.nfs4_fl.owner = lsp;
594 atomic_inc(&lsp->ls_count);
595}
596
597static void nfs4_fl_release_lock(struct file_lock *fl)
598{
599 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
600}
601
602static struct file_lock_operations nfs4_fl_lock_ops = {
603 .fl_copy_lock = nfs4_fl_copy_lock,
604 .fl_release_private = nfs4_fl_release_lock,
605};
606
607int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
608{
609 struct nfs4_lock_state *lsp;
610
611 if (fl->fl_ops != NULL)
612 return 0;
613 lsp = nfs4_get_lock_state(state, fl->fl_owner);
614 if (lsp == NULL)
615 return -ENOMEM;
616 fl->fl_u.nfs4_fl.owner = lsp;
617 fl->fl_ops = &nfs4_fl_lock_ops;
618 return 0;
619}
620
621/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 * Byte-range lock aware utility to initialize the stateid of read/write
623 * requests.
624 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000625void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000627 struct nfs4_lock_state *lsp;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400628 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400630 do {
631 seq = read_seqbegin(&state->seqlock);
632 memcpy(dst, &state->stateid, sizeof(*dst));
633 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000634 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
635 return;
636
637 spin_lock(&state->state_lock);
638 lsp = __nfs4_find_lock_state(state, fl_owner);
639 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
640 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
641 spin_unlock(&state->state_lock);
642 nfs4_put_lock_state(lsp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643}
644
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700645struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646{
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700647 struct nfs_seqid *new;
648
649 new = kmalloc(sizeof(*new), GFP_KERNEL);
650 if (new != NULL) {
651 new->sequence = counter;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500652 INIT_LIST_HEAD(&new->list);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700653 }
654 return new;
655}
656
657void nfs_free_seqid(struct nfs_seqid *seqid)
658{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500659 if (!list_empty(&seqid->list)) {
660 struct rpc_sequence *sequence = seqid->sequence->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700661
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500662 spin_lock(&sequence->lock);
663 list_del(&seqid->list);
664 spin_unlock(&sequence->lock);
665 rpc_wake_up(&sequence->wait);
666 }
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700667 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668}
669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700671 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
672 * failed with a seqid incrementing error -
673 * see comments nfs_fs.h:seqid_mutating_error()
674 */
Trond Myklebust88d90932007-07-02 14:03:03 -0400675static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500677 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700678 switch (status) {
679 case 0:
680 break;
681 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400682 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
683 return;
684 printk(KERN_WARNING "NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -0800685 " sequence-id error on an"
686 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400687 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700688 case -NFS4ERR_STALE_CLIENTID:
689 case -NFS4ERR_STALE_STATEID:
690 case -NFS4ERR_BAD_STATEID:
691 case -NFS4ERR_BADXDR:
692 case -NFS4ERR_RESOURCE:
693 case -NFS4ERR_NOFILEHANDLE:
694 /* Non-seqid mutating errors */
695 return;
696 };
697 /*
698 * Note: no locking needed as we are guaranteed to be first
699 * on the sequence list
700 */
701 seqid->sequence->counter++;
702}
703
704void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
705{
706 if (status == -NFS4ERR_BAD_SEQID) {
707 struct nfs4_state_owner *sp = container_of(seqid->sequence,
708 struct nfs4_state_owner, so_seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 nfs4_drop_state_owner(sp);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700710 }
Trond Myklebust88d90932007-07-02 14:03:03 -0400711 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700712}
713
714/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700715 * Increment the seqid if the LOCK/LOCKU succeeded, or
716 * failed with a seqid incrementing error -
717 * see comments nfs_fs.h:seqid_mutating_error()
718 */
719void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
720{
Trond Myklebust88d90932007-07-02 14:03:03 -0400721 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700722}
723
724int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
725{
726 struct rpc_sequence *sequence = seqid->sequence->sequence;
727 int status = 0;
728
729 spin_lock(&sequence->lock);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500730 if (list_empty(&seqid->list))
731 list_add_tail(&seqid->list, &sequence->list);
732 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
733 goto unlock;
734 rpc_sleep_on(&sequence->wait, task, NULL, NULL);
735 status = -EAGAIN;
736unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700737 spin_unlock(&sequence->lock);
738 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739}
740
741static int reclaimer(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
David Howellsadfa6f92006-08-22 20:06:08 -0400743static inline void nfs4_clear_recover_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +0100744{
745 smp_mb__before_clear_bit();
746 clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state);
747 smp_mb__after_clear_bit();
748 wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER);
749 rpc_wake_up(&clp->cl_rpcwaitq);
750}
751
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752/*
753 * State recovery routine
754 */
David Howellsadfa6f92006-08-22 20:06:08 -0400755static void nfs4_recover_state(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756{
Trond Myklebust5043e902006-01-03 09:55:23 +0100757 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Trond Myklebust5043e902006-01-03 09:55:23 +0100759 __module_get(THIS_MODULE);
760 atomic_inc(&clp->cl_count);
Chuck Lever5d8515c2007-12-10 14:57:16 -0500761 task = kthread_run(reclaimer, clp, "%s-reclaim",
762 rpc_peeraddr2str(clp->cl_rpcclient,
763 RPC_DISPLAY_ADDR));
Trond Myklebust5043e902006-01-03 09:55:23 +0100764 if (!IS_ERR(task))
765 return;
Trond Myklebust433fbe42006-01-03 09:55:22 +0100766 nfs4_clear_recover_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400767 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +0100768 module_put(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}
770
771/*
772 * Schedule a state recovery attempt
773 */
David Howellsadfa6f92006-08-22 20:06:08 -0400774void nfs4_schedule_state_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775{
776 if (!clp)
777 return;
Trond Myklebust433fbe42006-01-03 09:55:22 +0100778 if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
Trond Myklebust5043e902006-01-03 09:55:23 +0100779 nfs4_recover_state(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780}
781
782static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state)
783{
784 struct inode *inode = state->inode;
785 struct file_lock *fl;
786 int status = 0;
787
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800788 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
Trond Myklebust43b2a332005-11-04 15:35:30 -0500789 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 continue;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400791 if (nfs_file_open_context(fl->fl_file)->state != state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 continue;
793 status = ops->recover_lock(state, fl);
794 if (status >= 0)
795 continue;
796 switch (status) {
797 default:
798 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
799 __FUNCTION__, status);
800 case -NFS4ERR_EXPIRED:
801 case -NFS4ERR_NO_GRACE:
802 case -NFS4ERR_RECLAIM_BAD:
803 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust43b2a332005-11-04 15:35:30 -0500804 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 break;
806 case -NFS4ERR_STALE_CLIENTID:
807 goto out_err;
808 }
809 }
810 return 0;
811out_err:
812 return status;
813}
814
815static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp)
816{
817 struct nfs4_state *state;
818 struct nfs4_lock_state *lock;
819 int status = 0;
820
821 /* Note: we rely on the sp->so_states list being ordered
822 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
823 * states first.
824 * This is needed to ensure that the server won't give us any
825 * read delegations that we have to return if, say, we are
826 * recovering after a network partition or a reboot from a
827 * server that doesn't support a grace period.
828 */
829 list_for_each_entry(state, &sp->so_states, open_states) {
830 if (state->state == 0)
831 continue;
832 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 if (status >= 0) {
834 status = nfs4_reclaim_locks(ops, state);
835 if (status < 0)
836 goto out_err;
837 list_for_each_entry(lock, &state->lock_states, ls_locks) {
838 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
839 printk("%s: Lock reclaim failed!\n",
840 __FUNCTION__);
841 }
842 continue;
843 }
844 switch (status) {
845 default:
846 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
847 __FUNCTION__, status);
848 case -ENOENT:
849 case -NFS4ERR_RECLAIM_BAD:
850 case -NFS4ERR_RECLAIM_CONFLICT:
851 /*
852 * Open state on this file cannot be recovered
853 * All we can do is revert to using the zero stateid.
854 */
855 memset(state->stateid.data, 0,
856 sizeof(state->stateid.data));
857 /* Mark the file as being 'closed' */
858 state->state = 0;
859 break;
860 case -NFS4ERR_EXPIRED:
861 case -NFS4ERR_NO_GRACE:
862 case -NFS4ERR_STALE_CLIENTID:
863 goto out_err;
864 }
865 }
866 return 0;
867out_err:
868 return status;
869}
870
David Howellsadfa6f92006-08-22 20:06:08 -0400871static void nfs4_state_mark_reclaim(struct nfs_client *clp)
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700872{
873 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400874 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700875 struct nfs4_state *state;
876 struct nfs4_lock_state *lock;
877
878 /* Reset all sequence ids to zero */
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400879 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
880 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700881 sp->so_seqid.counter = 0;
882 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -0700883 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700884 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400885 clear_bit(NFS_DELEGATED_STATE, &state->flags);
886 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
887 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
888 clear_bit(NFS_O_RDWR_STATE, &state->flags);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700889 list_for_each_entry(lock, &state->lock_states, ls_locks) {
890 lock->ls_seqid.counter = 0;
891 lock->ls_seqid.flags = 0;
892 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
893 }
894 }
Trond Myklebustec073422005-10-20 14:22:47 -0700895 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700896 }
897}
898
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899static int reclaimer(void *ptr)
900{
David Howellsadfa6f92006-08-22 20:06:08 -0400901 struct nfs_client *clp = ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400903 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 struct nfs4_state_recovery_ops *ops;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100905 struct rpc_cred *cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 int status = 0;
907
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 allow_signal(SIGKILL);
909
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 /* Ensure exclusive access to NFSv4 state */
911 lock_kernel();
912 down_write(&clp->cl_sem);
913 /* Are there any NFS mounts out there? */
914 if (list_empty(&clp->cl_superblocks))
915 goto out;
916restart_loop:
Trond Myklebust286d7d62006-01-03 09:55:26 +0100917 ops = &nfs4_network_partition_recovery_ops;
918 /* Are there any open files on this volume? */
919 cred = nfs4_get_renew_cred(clp);
920 if (cred != NULL) {
921 /* Yes there are: try to renew the old lease */
922 status = nfs4_proc_renew(clp, cred);
923 switch (status) {
924 case 0:
925 case -NFS4ERR_CB_PATH_DOWN:
926 put_rpccred(cred);
927 goto out;
928 case -NFS4ERR_STALE_CLIENTID:
929 case -NFS4ERR_LEASE_MOVED:
930 ops = &nfs4_reboot_recovery_ops;
931 }
932 } else {
933 /* "reboot" to ensure we clear all state on the server */
934 clp->cl_boot_time = CURRENT_TIME;
935 cred = nfs4_get_setclientid_cred(clp);
936 }
937 /* We're going to have to re-establish a clientid */
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700938 nfs4_state_mark_reclaim(clp);
Trond Myklebust286d7d62006-01-03 09:55:26 +0100939 status = -ENOENT;
940 if (cred != NULL) {
941 status = nfs4_init_client(clp, cred);
942 put_rpccred(cred);
943 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 if (status)
945 goto out_error;
946 /* Mark all delegations for reclaim */
947 nfs_delegation_mark_reclaim(clp);
948 /* Note: list is protected by exclusive lock on cl->cl_sem */
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400949 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
950 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 status = nfs4_reclaim_open_state(ops, sp);
952 if (status < 0) {
953 if (status == -NFS4ERR_NO_GRACE) {
954 ops = &nfs4_network_partition_recovery_ops;
955 status = nfs4_reclaim_open_state(ops, sp);
956 }
957 if (status == -NFS4ERR_STALE_CLIENTID)
958 goto restart_loop;
959 if (status == -NFS4ERR_EXPIRED)
960 goto restart_loop;
961 }
962 }
963 nfs_delegation_reap_unclaimed(clp);
964out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 up_write(&clp->cl_sem);
966 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 if (status == -NFS4ERR_CB_PATH_DOWN)
968 nfs_handle_cb_pathdown(clp);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100969 nfs4_clear_recover_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400970 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +0100971 module_put_and_exit(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 return 0;
973out_error:
Chuck Lever5d8515c2007-12-10 14:57:16 -0500974 printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %s"
975 " with error %d\n", clp->cl_hostname, -status);
Trond Myklebust51581f32006-03-20 13:44:47 -0500976 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 goto out;
978}
979
980/*
981 * Local variables:
982 * c-basic-offset: 8
983 * End:
984 */