blob: 2022fe47966f52d641496fe633ad0d0b98b15fc7 [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
Trond Myklebust6dc9d572008-12-23 15:21:41 -050074static struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040075{
76 struct rpc_cred *cred = NULL;
77
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040078 if (clp->cl_machine_cred != NULL)
79 cred = get_rpccred(clp->cl_machine_cred);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040080 return cred;
81}
82
83static void nfs4_clear_machine_cred(struct nfs_client *clp)
84{
85 struct rpc_cred *cred;
86
87 spin_lock(&clp->cl_lock);
88 cred = clp->cl_machine_cred;
89 clp->cl_machine_cred = NULL;
90 spin_unlock(&clp->cl_lock);
91 if (cred != NULL)
92 put_rpccred(cred);
93}
94
Trond Myklebust6dc9d572008-12-23 15:21:41 -050095struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
Trond Myklebustb4454fe2006-01-03 09:55:25 +010096{
97 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -040098 struct rb_node *pos;
Trond Myklebustb4454fe2006-01-03 09:55:25 +010099 struct rpc_cred *cred = NULL;
100
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400101 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
102 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100103 if (list_empty(&sp->so_states))
104 continue;
105 cred = get_rpccred(sp->so_cred);
106 break;
107 }
108 return cred;
109}
110
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500111static struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
112{
113 struct rpc_cred *cred;
114
115 spin_lock(&clp->cl_lock);
116 cred = nfs4_get_renew_cred_locked(clp);
117 spin_unlock(&clp->cl_lock);
118 return cred;
119}
120
Trond Myklebust10afec92007-05-14 17:16:04 -0400121static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
Trond Myklebust286d7d62006-01-03 09:55:26 +0100122{
123 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400124 struct rb_node *pos;
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400125 struct rpc_cred *cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100126
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500127 spin_lock(&clp->cl_lock);
128 cred = nfs4_get_machine_cred_locked(clp);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400129 if (cred != NULL)
130 goto out;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400131 pos = rb_first(&clp->cl_state_owners);
132 if (pos != NULL) {
133 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400134 cred = get_rpccred(sp->so_cred);
Trond Myklebust286d7d62006-01-03 09:55:26 +0100135 }
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400136out:
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500137 spin_unlock(&clp->cl_lock);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400138 return cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100139}
140
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400141static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
142 __u64 minval, int maxbits)
143{
144 struct rb_node **p, *parent;
145 struct nfs_unique_id *pos;
146 __u64 mask = ~0ULL;
147
148 if (maxbits < 64)
149 mask = (1ULL << maxbits) - 1ULL;
150
151 /* Ensure distribution is more or less flat */
152 get_random_bytes(&new->id, sizeof(new->id));
153 new->id &= mask;
154 if (new->id < minval)
155 new->id += minval;
156retry:
157 p = &root->rb_node;
158 parent = NULL;
159
160 while (*p != NULL) {
161 parent = *p;
162 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
163
164 if (new->id < pos->id)
165 p = &(*p)->rb_left;
166 else if (new->id > pos->id)
167 p = &(*p)->rb_right;
168 else
169 goto id_exists;
170 }
171 rb_link_node(&new->rb_node, parent, p);
172 rb_insert_color(&new->rb_node, root);
173 return;
174id_exists:
175 for (;;) {
176 new->id++;
177 if (new->id < minval || (new->id & mask) != new->id) {
178 new->id = minval;
179 break;
180 }
181 parent = rb_next(parent);
182 if (parent == NULL)
183 break;
184 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
185 if (new->id < pos->id)
186 break;
187 }
188 goto retry;
189}
190
191static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
192{
193 rb_erase(&id->rb_node, root);
194}
195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196static struct nfs4_state_owner *
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400197nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400199 struct nfs_client *clp = server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400200 struct rb_node **p = &clp->cl_state_owners.rb_node,
201 *parent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 struct nfs4_state_owner *sp, *res = NULL;
203
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400204 while (*p != NULL) {
205 parent = *p;
206 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
207
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400208 if (server < sp->so_server) {
209 p = &parent->rb_left;
210 continue;
211 }
212 if (server > sp->so_server) {
213 p = &parent->rb_right;
214 continue;
215 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400216 if (cred < sp->so_cred)
217 p = &parent->rb_left;
218 else if (cred > sp->so_cred)
219 p = &parent->rb_right;
220 else {
221 atomic_inc(&sp->so_count);
222 res = sp;
223 break;
224 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
226 return res;
227}
228
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400229static struct nfs4_state_owner *
230nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
231{
232 struct rb_node **p = &clp->cl_state_owners.rb_node,
233 *parent = NULL;
234 struct nfs4_state_owner *sp;
235
236 while (*p != NULL) {
237 parent = *p;
238 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
239
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400240 if (new->so_server < sp->so_server) {
241 p = &parent->rb_left;
242 continue;
243 }
244 if (new->so_server > sp->so_server) {
245 p = &parent->rb_right;
246 continue;
247 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400248 if (new->so_cred < sp->so_cred)
249 p = &parent->rb_left;
250 else if (new->so_cred > sp->so_cred)
251 p = &parent->rb_right;
252 else {
253 atomic_inc(&sp->so_count);
254 return sp;
255 }
256 }
257 nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
258 rb_link_node(&new->so_client_node, parent, p);
259 rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
260 return new;
261}
262
263static void
264nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
265{
266 if (!RB_EMPTY_NODE(&sp->so_client_node))
267 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
268 nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
269}
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271/*
272 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
273 * create a new state_owner.
274 *
275 */
276static struct nfs4_state_owner *
277nfs4_alloc_state_owner(void)
278{
279 struct nfs4_state_owner *sp;
280
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700281 sp = kzalloc(sizeof(*sp),GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (!sp)
283 return NULL;
Trond Myklebustec073422005-10-20 14:22:47 -0700284 spin_lock_init(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 INIT_LIST_HEAD(&sp->so_states);
286 INIT_LIST_HEAD(&sp->so_delegations);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700287 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
288 sp->so_seqid.sequence = &sp->so_sequence;
289 spin_lock_init(&sp->so_sequence.lock);
290 INIT_LIST_HEAD(&sp->so_sequence.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 atomic_set(&sp->so_count, 1);
292 return sp;
293}
294
Adrian Bunk1d2e88e2008-05-02 13:42:45 -0700295static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296nfs4_drop_state_owner(struct nfs4_state_owner *sp)
297{
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400298 if (!RB_EMPTY_NODE(&sp->so_client_node)) {
299 struct nfs_client *clp = sp->so_client;
300
301 spin_lock(&clp->cl_lock);
302 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
303 RB_CLEAR_NODE(&sp->so_client_node);
304 spin_unlock(&clp->cl_lock);
305 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306}
307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
309{
David Howells7539bba2006-08-22 20:06:09 -0400310 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 struct nfs4_state_owner *sp, *new;
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 spin_lock(&clp->cl_lock);
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400314 sp = nfs4_find_state_owner(server, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 if (sp != NULL)
317 return sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400318 new = nfs4_alloc_state_owner();
319 if (new == NULL)
320 return NULL;
321 new->so_client = clp;
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400322 new->so_server = server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400323 new->so_cred = cred;
324 spin_lock(&clp->cl_lock);
325 sp = nfs4_insert_state_owner(clp, new);
326 spin_unlock(&clp->cl_lock);
327 if (sp == new)
328 get_rpccred(cred);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500329 else {
330 rpc_destroy_wait_queue(&new->so_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400331 kfree(new);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500332 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400333 return sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336void nfs4_put_state_owner(struct nfs4_state_owner *sp)
337{
David Howellsadfa6f92006-08-22 20:06:08 -0400338 struct nfs_client *clp = sp->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 struct rpc_cred *cred = sp->so_cred;
340
341 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
342 return;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400343 nfs4_remove_state_owner(clp, sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500345 rpc_destroy_wait_queue(&sp->so_sequence.wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 put_rpccred(cred);
347 kfree(sp);
348}
349
350static struct nfs4_state *
351nfs4_alloc_open_state(void)
352{
353 struct nfs4_state *state;
354
Trond Myklebuste7616922006-01-03 09:55:13 +0100355 state = kzalloc(sizeof(*state), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (!state)
357 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 atomic_set(&state->count, 1);
359 INIT_LIST_HEAD(&state->lock_states);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000360 spin_lock_init(&state->state_lock);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400361 seqlock_init(&state->seqlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 return state;
363}
364
Trond Myklebust4cecb762005-11-04 15:32:58 -0500365void
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500366nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500367{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500368 if (state->state == fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500369 return;
370 /* NB! List reordering - see the reclaim code for why. */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500371 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
372 if (fmode & FMODE_WRITE)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500373 list_move(&state->open_states, &state->owner->so_states);
374 else
375 list_move_tail(&state->open_states, &state->owner->so_states);
376 }
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500377 state->state = fmode;
Trond Myklebust4cecb762005-11-04 15:32:58 -0500378}
379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380static struct nfs4_state *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
382{
383 struct nfs_inode *nfsi = NFS_I(inode);
384 struct nfs4_state *state;
385
386 list_for_each_entry(state, &nfsi->open_states, inode_states) {
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400387 if (state->owner != owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 continue;
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400389 if (atomic_inc_not_zero(&state->count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 return state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 }
392 return NULL;
393}
394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395static void
396nfs4_free_open_state(struct nfs4_state *state)
397{
398 kfree(state);
399}
400
401struct nfs4_state *
402nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
403{
404 struct nfs4_state *state, *new;
405 struct nfs_inode *nfsi = NFS_I(inode);
406
407 spin_lock(&inode->i_lock);
408 state = __nfs4_find_state_byowner(inode, owner);
409 spin_unlock(&inode->i_lock);
410 if (state)
411 goto out;
412 new = nfs4_alloc_open_state();
Trond Myklebustec073422005-10-20 14:22:47 -0700413 spin_lock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 spin_lock(&inode->i_lock);
415 state = __nfs4_find_state_byowner(inode, owner);
416 if (state == NULL && new != NULL) {
417 state = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 state->owner = owner;
419 atomic_inc(&owner->so_count);
420 list_add(&state->inode_states, &nfsi->open_states);
421 state->inode = igrab(inode);
422 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700423 /* Note: The reclaim code dictates that we add stateless
424 * and read-only stateids to the end of the list */
425 list_add_tail(&state->open_states, &owner->so_states);
426 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 } else {
428 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700429 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 if (new)
431 nfs4_free_open_state(new);
432 }
433out:
434 return state;
435}
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437void nfs4_put_open_state(struct nfs4_state *state)
438{
439 struct inode *inode = state->inode;
440 struct nfs4_state_owner *owner = state->owner;
441
Trond Myklebustec073422005-10-20 14:22:47 -0700442 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 return;
Trond Myklebustec073422005-10-20 14:22:47 -0700444 spin_lock(&inode->i_lock);
Trond Myklebustba683032007-07-27 10:23:05 -0400445 list_del(&state->inode_states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 list_del(&state->open_states);
Trond Myklebustec073422005-10-20 14:22:47 -0700447 spin_unlock(&inode->i_lock);
448 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 nfs4_free_open_state(state);
451 nfs4_put_state_owner(owner);
452}
453
454/*
Trond Myklebust83c9d412005-10-18 14:20:13 -0700455 * Close the current file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500457static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 struct nfs4_state_owner *owner = state->owner;
Trond Myklebust003707c2007-07-05 18:07:55 -0400460 int call_close = 0;
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500461 fmode_t newstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463 atomic_inc(&owner->so_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 /* Protect against nfs4_find_state() */
Trond Myklebustec073422005-10-20 14:22:47 -0700465 spin_lock(&owner->so_lock);
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500466 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100467 case FMODE_READ:
468 state->n_rdonly--;
469 break;
470 case FMODE_WRITE:
471 state->n_wronly--;
472 break;
473 case FMODE_READ|FMODE_WRITE:
474 state->n_rdwr--;
475 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400476 newstate = FMODE_READ|FMODE_WRITE;
Trond Myklebuste7616922006-01-03 09:55:13 +0100477 if (state->n_rdwr == 0) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400478 if (state->n_rdonly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100479 newstate &= ~FMODE_READ;
Trond Myklebust003707c2007-07-05 18:07:55 -0400480 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
481 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
482 }
483 if (state->n_wronly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100484 newstate &= ~FMODE_WRITE;
Trond Myklebust003707c2007-07-05 18:07:55 -0400485 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
486 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
487 }
488 if (newstate == 0)
489 clear_bit(NFS_DELEGATED_STATE, &state->flags);
Trond Myklebuste7616922006-01-03 09:55:13 +0100490 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400491 nfs4_state_set_mode_locked(state, newstate);
Trond Myklebustec073422005-10-20 14:22:47 -0700492 spin_unlock(&owner->so_lock);
Trond Myklebust4cecb762005-11-04 15:32:58 -0500493
Trond Myklebust003707c2007-07-05 18:07:55 -0400494 if (!call_close) {
Trond Myklebustb39e6252007-06-11 23:05:07 -0400495 nfs4_put_open_state(state);
496 nfs4_put_state_owner(owner);
497 } else
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400498 nfs4_do_close(path, state, wait);
499}
500
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500501void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400502{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500503 __nfs4_close(path, state, fmode, 0);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400504}
505
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500506void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400507{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500508 __nfs4_close(path, state, fmode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509}
510
511/*
512 * Search the state->lock_states for an existing lock_owner
513 * that is compatible with current->files
514 */
515static struct nfs4_lock_state *
516__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
517{
518 struct nfs4_lock_state *pos;
519 list_for_each_entry(pos, &state->lock_states, ls_locks) {
520 if (pos->ls_owner != fl_owner)
521 continue;
522 atomic_inc(&pos->ls_count);
523 return pos;
524 }
525 return NULL;
526}
527
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528/*
529 * Return a compatible lock_state. If no initialized lock_state structure
530 * exists, return an uninitialized one.
531 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 */
533static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
534{
535 struct nfs4_lock_state *lsp;
David Howellsadfa6f92006-08-22 20:06:08 -0400536 struct nfs_client *clp = state->owner->so_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700538 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (lsp == NULL)
540 return NULL;
Trond Myklebustd0dc3702008-01-10 16:07:54 -0500541 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
542 spin_lock_init(&lsp->ls_sequence.lock);
543 INIT_LIST_HEAD(&lsp->ls_sequence.list);
544 lsp->ls_seqid.sequence = &lsp->ls_sequence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 atomic_set(&lsp->ls_count, 1);
546 lsp->ls_owner = fl_owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 spin_lock(&clp->cl_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400548 nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 spin_unlock(&clp->cl_lock);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000550 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 return lsp;
552}
553
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400554static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
555{
556 struct nfs_client *clp = lsp->ls_state->owner->so_client;
557
558 spin_lock(&clp->cl_lock);
559 nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
560 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500561 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400562 kfree(lsp);
563}
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565/*
566 * Return a compatible lock_state. If no initialized lock_state structure
567 * exists, return an uninitialized one.
568 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000570static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000572 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000574 for(;;) {
575 spin_lock(&state->state_lock);
576 lsp = __nfs4_find_lock_state(state, owner);
577 if (lsp != NULL)
578 break;
579 if (new != NULL) {
580 new->ls_state = state;
581 list_add(&new->ls_locks, &state->lock_states);
582 set_bit(LK_STATE_IN_USE, &state->flags);
583 lsp = new;
584 new = NULL;
585 break;
586 }
587 spin_unlock(&state->state_lock);
588 new = nfs4_alloc_lock_state(state, owner);
589 if (new == NULL)
590 return NULL;
591 }
592 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400593 if (new != NULL)
594 nfs4_free_lock_state(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 return lsp;
596}
597
598/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000599 * Release reference to lock_state, and free it if we see that
600 * it is no longer in use
601 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700602void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000603{
604 struct nfs4_state *state;
605
606 if (lsp == NULL)
607 return;
608 state = lsp->ls_state;
609 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
610 return;
611 list_del(&lsp->ls_locks);
612 if (list_empty(&state->lock_states))
613 clear_bit(LK_STATE_IN_USE, &state->flags);
614 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400615 nfs4_free_lock_state(lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000616}
617
618static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
619{
620 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
621
622 dst->fl_u.nfs4_fl.owner = lsp;
623 atomic_inc(&lsp->ls_count);
624}
625
626static void nfs4_fl_release_lock(struct file_lock *fl)
627{
628 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
629}
630
631static struct file_lock_operations nfs4_fl_lock_ops = {
632 .fl_copy_lock = nfs4_fl_copy_lock,
633 .fl_release_private = nfs4_fl_release_lock,
634};
635
636int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
637{
638 struct nfs4_lock_state *lsp;
639
640 if (fl->fl_ops != NULL)
641 return 0;
642 lsp = nfs4_get_lock_state(state, fl->fl_owner);
643 if (lsp == NULL)
644 return -ENOMEM;
645 fl->fl_u.nfs4_fl.owner = lsp;
646 fl->fl_ops = &nfs4_fl_lock_ops;
647 return 0;
648}
649
650/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 * Byte-range lock aware utility to initialize the stateid of read/write
652 * requests.
653 */
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000654void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000656 struct nfs4_lock_state *lsp;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400657 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400659 do {
660 seq = read_seqbegin(&state->seqlock);
661 memcpy(dst, &state->stateid, sizeof(*dst));
662 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000663 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
664 return;
665
666 spin_lock(&state->state_lock);
667 lsp = __nfs4_find_lock_state(state, fl_owner);
668 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
669 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
670 spin_unlock(&state->state_lock);
671 nfs4_put_lock_state(lsp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672}
673
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700674struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675{
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700676 struct nfs_seqid *new;
677
678 new = kmalloc(sizeof(*new), GFP_KERNEL);
679 if (new != NULL) {
680 new->sequence = counter;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500681 INIT_LIST_HEAD(&new->list);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700682 }
683 return new;
684}
685
686void nfs_free_seqid(struct nfs_seqid *seqid)
687{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500688 if (!list_empty(&seqid->list)) {
689 struct rpc_sequence *sequence = seqid->sequence->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700690
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500691 spin_lock(&sequence->lock);
692 list_del(&seqid->list);
693 spin_unlock(&sequence->lock);
694 rpc_wake_up(&sequence->wait);
695 }
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700696 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697}
698
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700700 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
701 * failed with a seqid incrementing error -
702 * see comments nfs_fs.h:seqid_mutating_error()
703 */
Trond Myklebust88d90932007-07-02 14:03:03 -0400704static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500706 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700707 switch (status) {
708 case 0:
709 break;
710 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400711 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
712 return;
713 printk(KERN_WARNING "NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -0800714 " sequence-id error on an"
715 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400716 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700717 case -NFS4ERR_STALE_CLIENTID:
718 case -NFS4ERR_STALE_STATEID:
719 case -NFS4ERR_BAD_STATEID:
720 case -NFS4ERR_BADXDR:
721 case -NFS4ERR_RESOURCE:
722 case -NFS4ERR_NOFILEHANDLE:
723 /* Non-seqid mutating errors */
724 return;
725 };
726 /*
727 * Note: no locking needed as we are guaranteed to be first
728 * on the sequence list
729 */
730 seqid->sequence->counter++;
731}
732
733void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
734{
735 if (status == -NFS4ERR_BAD_SEQID) {
736 struct nfs4_state_owner *sp = container_of(seqid->sequence,
737 struct nfs4_state_owner, so_seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 nfs4_drop_state_owner(sp);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700739 }
Trond Myklebust88d90932007-07-02 14:03:03 -0400740 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700741}
742
743/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700744 * Increment the seqid if the LOCK/LOCKU succeeded, or
745 * failed with a seqid incrementing error -
746 * see comments nfs_fs.h:seqid_mutating_error()
747 */
748void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
749{
Trond Myklebust88d90932007-07-02 14:03:03 -0400750 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700751}
752
753int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
754{
755 struct rpc_sequence *sequence = seqid->sequence->sequence;
756 int status = 0;
757
758 spin_lock(&sequence->lock);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500759 if (list_empty(&seqid->list))
760 list_add_tail(&seqid->list, &sequence->list);
761 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
762 goto unlock;
Trond Myklebust5d008372008-02-22 16:34:17 -0500763 rpc_sleep_on(&sequence->wait, task, NULL);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500764 status = -EAGAIN;
765unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700766 spin_unlock(&sequence->lock);
767 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768}
769
Trond Myklebuste005e802008-12-23 15:21:48 -0500770static int nfs4_run_state_manager(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Trond Myklebuste005e802008-12-23 15:21:48 -0500772static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +0100773{
774 smp_mb__before_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -0500775 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100776 smp_mb__after_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -0500777 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100778 rpc_wake_up(&clp->cl_rpcwaitq);
779}
780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781/*
Trond Myklebuste005e802008-12-23 15:21:48 -0500782 * Schedule the nfs_client asynchronous state management routine
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 */
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500784void nfs4_schedule_state_manager(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785{
Trond Myklebust5043e902006-01-03 09:55:23 +0100786 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Trond Myklebuste005e802008-12-23 15:21:48 -0500788 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
789 return;
Trond Myklebust5043e902006-01-03 09:55:23 +0100790 __module_get(THIS_MODULE);
791 atomic_inc(&clp->cl_count);
Trond Myklebuste005e802008-12-23 15:21:48 -0500792 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
Chuck Lever5d8515c2007-12-10 14:57:16 -0500793 rpc_peeraddr2str(clp->cl_rpcclient,
794 RPC_DISPLAY_ADDR));
Trond Myklebust5043e902006-01-03 09:55:23 +0100795 if (!IS_ERR(task))
796 return;
Trond Myklebuste005e802008-12-23 15:21:48 -0500797 nfs4_clear_state_manager_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400798 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +0100799 module_put(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800}
801
802/*
803 * Schedule a state recovery attempt
804 */
David Howellsadfa6f92006-08-22 20:06:08 -0400805void nfs4_schedule_state_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806{
807 if (!clp)
808 return;
Trond Myklebuste598d842008-12-23 15:21:42 -0500809 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
810 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Trond Myklebuste005e802008-12-23 15:21:48 -0500811 nfs4_schedule_state_manager(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812}
813
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500814static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
815{
816
817 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
818 /* Don't recover state that expired before the reboot */
819 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
820 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
821 return 0;
822 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -0500823 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500824 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
825 return 1;
826}
827
Trond Myklebust9e33bed2008-12-23 15:21:46 -0500828int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500829{
830 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
831 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
Trond Myklebust7eff03a2008-12-23 15:21:43 -0500832 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500833 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
834 return 1;
835}
836
Trond Myklebust02860012008-12-23 15:21:40 -0500837static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838{
839 struct inode *inode = state->inode;
Trond Myklebust19e03c52008-12-23 15:21:44 -0500840 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 struct file_lock *fl;
842 int status = 0;
843
Trond Myklebust19e03c52008-12-23 15:21:44 -0500844 down_write(&nfsi->rwsem);
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800845 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
Trond Myklebust43b2a332005-11-04 15:35:30 -0500846 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 continue;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400848 if (nfs_file_open_context(fl->fl_file)->state != state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 continue;
850 status = ops->recover_lock(state, fl);
851 if (status >= 0)
852 continue;
853 switch (status) {
854 default:
855 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700856 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 case -NFS4ERR_EXPIRED:
858 case -NFS4ERR_NO_GRACE:
859 case -NFS4ERR_RECLAIM_BAD:
860 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust43b2a332005-11-04 15:35:30 -0500861 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 break;
863 case -NFS4ERR_STALE_CLIENTID:
864 goto out_err;
865 }
866 }
Trond Myklebust19e03c52008-12-23 15:21:44 -0500867 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 return 0;
869out_err:
Trond Myklebust19e03c52008-12-23 15:21:44 -0500870 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 return status;
872}
873
Trond Myklebust02860012008-12-23 15:21:40 -0500874static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875{
876 struct nfs4_state *state;
877 struct nfs4_lock_state *lock;
878 int status = 0;
879
880 /* Note: we rely on the sp->so_states list being ordered
881 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
882 * states first.
883 * This is needed to ensure that the server won't give us any
884 * read delegations that we have to return if, say, we are
885 * recovering after a network partition or a reboot from a
886 * server that doesn't support a grace period.
887 */
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500888restart:
889 spin_lock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500891 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
892 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 if (state->state == 0)
894 continue;
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500895 atomic_inc(&state->count);
896 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 if (status >= 0) {
Trond Myklebust02860012008-12-23 15:21:40 -0500899 status = nfs4_reclaim_locks(state, ops);
900 if (status >= 0) {
901 list_for_each_entry(lock, &state->lock_states, ls_locks) {
902 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
903 printk("%s: Lock reclaim failed!\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700904 __func__);
Trond Myklebust02860012008-12-23 15:21:40 -0500905 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500906 nfs4_put_open_state(state);
907 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 }
910 switch (status) {
911 default:
912 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700913 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 case -ENOENT:
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500915 case -ESTALE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 /*
917 * Open state on this file cannot be recovered
918 * All we can do is revert to using the zero stateid.
919 */
920 memset(state->stateid.data, 0,
921 sizeof(state->stateid.data));
922 /* Mark the file as being 'closed' */
923 state->state = 0;
924 break;
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500925 case -NFS4ERR_RECLAIM_BAD:
926 case -NFS4ERR_RECLAIM_CONFLICT:
927 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
928 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 case -NFS4ERR_EXPIRED:
930 case -NFS4ERR_NO_GRACE:
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500931 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 case -NFS4ERR_STALE_CLIENTID:
933 goto out_err;
934 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500935 nfs4_put_open_state(state);
936 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500938 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 return 0;
940out_err:
Trond Myklebustfe1d8192008-12-23 15:21:43 -0500941 nfs4_put_open_state(state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 return status;
943}
944
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500945static void nfs4_clear_open_state(struct nfs4_state *state)
946{
947 struct nfs4_lock_state *lock;
948
949 clear_bit(NFS_DELEGATED_STATE, &state->flags);
950 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
951 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
952 clear_bit(NFS_O_RDWR_STATE, &state->flags);
953 list_for_each_entry(lock, &state->lock_states, ls_locks) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500954 lock->ls_seqid.flags = 0;
955 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
956 }
957}
958
959static 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 -0700960{
961 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400962 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700963 struct nfs4_state *state;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700964
965 /* Reset all sequence ids to zero */
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400966 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
967 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700968 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -0700969 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700970 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500971 if (mark_reclaim(clp, state))
972 nfs4_clear_open_state(state);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700973 }
Trond Myklebustec073422005-10-20 14:22:47 -0700974 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700975 }
976}
977
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500978static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
979{
980 /* Mark all delegations for reclaim */
981 nfs_delegation_mark_reclaim(clp);
982 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
983}
984
985static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
986{
987 struct nfs4_state_owner *sp;
988 struct rb_node *pos;
989 struct nfs4_state *state;
990
991 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
992 return;
993
994 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
995 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
996 spin_lock(&sp->so_lock);
997 list_for_each_entry(state, &sp->so_states, open_states) {
998 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
999 continue;
1000 nfs4_state_mark_reclaim_nograce(clp, state);
1001 }
1002 spin_unlock(&sp->so_lock);
1003 }
1004
1005 nfs_delegation_reap_unclaimed(clp);
1006}
1007
1008static void nfs_delegation_clear_all(struct nfs_client *clp)
1009{
1010 nfs_delegation_mark_reclaim(clp);
1011 nfs_delegation_reap_unclaimed(clp);
1012}
1013
1014static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1015{
1016 nfs_delegation_clear_all(clp);
1017 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1018}
1019
1020static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp)
1021{
1022 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1023}
1024
Trond Myklebuste598d842008-12-23 15:21:42 -05001025static void nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1026{
1027 switch (error) {
1028 case -NFS4ERR_CB_PATH_DOWN:
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001029 nfs_handle_cb_pathdown(clp);
Trond Myklebuste598d842008-12-23 15:21:42 -05001030 break;
1031 case -NFS4ERR_STALE_CLIENTID:
1032 case -NFS4ERR_LEASE_MOVED:
1033 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1034 nfs4_state_start_reclaim_reboot(clp);
1035 break;
1036 case -NFS4ERR_EXPIRED:
1037 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1038 nfs4_state_start_reclaim_nograce(clp);
1039 }
1040}
1041
Trond Myklebust02860012008-12-23 15:21:40 -05001042static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043{
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001044 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 int status = 0;
1046
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001047restart:
1048 spin_lock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001049 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1050 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001051 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1052 continue;
1053 atomic_inc(&sp->so_count);
1054 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001055 status = nfs4_reclaim_open_state(sp, ops);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001056 if (status < 0) {
1057 set_bit(ops->owner_flag_bit, &sp->so_flags);
1058 nfs4_put_state_owner(sp);
1059 nfs4_recovery_handle_error(clp, status);
1060 return status;
1061 }
1062 nfs4_put_state_owner(sp);
1063 goto restart;
Trond Myklebust02860012008-12-23 15:21:40 -05001064 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001065 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001066 return status;
1067}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
Trond Myklebust02860012008-12-23 15:21:40 -05001069static int nfs4_check_lease(struct nfs_client *clp)
1070{
1071 struct rpc_cred *cred;
1072 int status = -NFS4ERR_EXPIRED;
1073
Trond Myklebust0f605b52008-12-23 15:21:42 -05001074 /* Is the client already known to have an expired lease? */
1075 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1076 return 0;
Trond Myklebust286d7d62006-01-03 09:55:26 +01001077 cred = nfs4_get_renew_cred(clp);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001078 if (cred == NULL) {
1079 cred = nfs4_get_setclientid_cred(clp);
1080 if (cred == NULL)
1081 goto out;
Trond Myklebust02860012008-12-23 15:21:40 -05001082 }
Trond Myklebust0f605b52008-12-23 15:21:42 -05001083 status = nfs4_proc_renew(clp, cred);
1084 put_rpccred(cred);
1085out:
1086 nfs4_recovery_handle_error(clp, status);
Trond Myklebust02860012008-12-23 15:21:40 -05001087 return status;
1088}
1089
1090static int nfs4_reclaim_lease(struct nfs_client *clp)
1091{
1092 struct rpc_cred *cred;
1093 int status = -ENOENT;
1094
1095 cred = nfs4_get_setclientid_cred(clp);
1096 if (cred != NULL) {
1097 status = nfs4_init_client(clp, cred);
1098 put_rpccred(cred);
1099 /* Handle case where the user hasn't set up machine creds */
1100 if (status == -EACCES && cred == clp->cl_machine_cred) {
1101 nfs4_clear_machine_cred(clp);
1102 status = -EAGAIN;
1103 }
1104 }
1105 return status;
1106}
1107
Trond Myklebuste005e802008-12-23 15:21:48 -05001108static void nfs4_state_manager(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05001109{
Trond Myklebust02860012008-12-23 15:21:40 -05001110 int status = 0;
1111
Trond Myklebust02860012008-12-23 15:21:40 -05001112 /* Ensure exclusive access to NFSv4 state */
Trond Myklebustf3c76492008-12-23 15:21:48 -05001113 for(;;) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001114 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1115 /* We're going to have to re-establish a clientid */
1116 status = nfs4_reclaim_lease(clp);
1117 if (status) {
1118 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1119 if (status == -EAGAIN)
1120 continue;
1121 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 }
Trond Myklebuste598d842008-12-23 15:21:42 -05001123 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1124 }
1125
1126 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1127 status = nfs4_check_lease(clp);
1128 if (status != 0)
1129 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 }
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001131
1132 /* First recover reboot state... */
1133 if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001134 status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops);
Trond Myklebuste598d842008-12-23 15:21:42 -05001135 if (status == -NFS4ERR_STALE_CLIENTID)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001136 continue;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001137 nfs4_state_end_reclaim_reboot(clp);
1138 continue;
1139 }
1140
1141 /* Now recover expired state... */
1142 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001143 status = nfs4_do_reclaim(clp, &nfs4_nograce_recovery_ops);
1144 if (status < 0) {
1145 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1146 if (status == -NFS4ERR_STALE_CLIENTID)
1147 continue;
1148 if (status == -NFS4ERR_EXPIRED)
1149 continue;
1150 goto out_error;
1151 } else
1152 nfs4_state_end_reclaim_nograce(clp);
1153 continue;
1154 }
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001155
1156 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1157 nfs_client_return_marked_delegations(clp);
1158 continue;
1159 }
Trond Myklebuste005e802008-12-23 15:21:48 -05001160
1161 nfs4_clear_state_manager_bit(clp);
Trond Myklebustf3c76492008-12-23 15:21:48 -05001162 /* Did we race with an attempt to give us more work? */
1163 if (clp->cl_state == 0)
1164 break;
1165 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1166 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 }
Trond Myklebuste005e802008-12-23 15:21:48 -05001168 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169out_error:
Trond Myklebuste005e802008-12-23 15:21:48 -05001170 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
Chuck Lever5d8515c2007-12-10 14:57:16 -05001171 " with error %d\n", clp->cl_hostname, -status);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001172 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1173 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebuste005e802008-12-23 15:21:48 -05001174 nfs4_clear_state_manager_bit(clp);
1175}
1176
1177static int nfs4_run_state_manager(void *ptr)
1178{
1179 struct nfs_client *clp = ptr;
1180
1181 allow_signal(SIGKILL);
1182 nfs4_state_manager(clp);
1183 nfs_put_client(clp);
1184 module_put_and_exit(0);
1185 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186}
1187
1188/*
1189 * Local variables:
1190 * c-basic-offset: 8
1191 * End:
1192 */