blob: 3e2f19b04c06b4b3fb0f01cb409a544054940222 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/nfs/nfs4state.c
3 *
4 * Client-side XDR for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
38 * subsequent patch.
39 */
40
Trond Myklebust6f43ddc2007-07-08 16:49:11 -040041#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/slab.h>
43#include <linux/smp_lock.h>
44#include <linux/nfs_fs.h>
45#include <linux/nfs_idmap.h>
Trond Myklebust5043e902006-01-03 09:55:23 +010046#include <linux/kthread.h>
47#include <linux/module.h>
Trond Myklebust9f958ab2007-07-02 13:58:33 -040048#include <linux/random.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/workqueue.h>
50#include <linux/bitops.h>
51
Trond Myklebust4ce79712005-06-22 17:16:21 +000052#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include "callback.h"
54#include "delegation.h"
David Howells24c8dbb2006-08-22 20:06:10 -040055#include "internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57#define OPENOWNER_POOL_SIZE 8
58
Trond Myklebust4ce79712005-06-22 17:16:21 +000059const nfs4_stateid zero_stateid;
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061static LIST_HEAD(nfs4_clientid_list);
62
Andy Adamson591d71c2009-04-01 09:22:47 -040063int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040065 struct nfs4_setclientid_res clid;
Chuck Leverf738f512009-03-18 20:48:06 -040066 unsigned short port;
67 int status;
68
69 port = nfs_callback_tcpport;
70 if (clp->cl_addr.ss_family == AF_INET6)
71 port = nfs_callback_tcpport6;
72
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040073 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
74 if (status != 0)
75 goto out;
76 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
77 if (status != 0)
78 goto out;
79 clp->cl_clientid = clid.clientid;
80 nfs4_schedule_state_renewal(clp);
81out:
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 return status;
83}
84
Andy Adamsona7b72102009-04-01 09:22:46 -040085struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040086{
87 struct rpc_cred *cred = NULL;
88
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040089 if (clp->cl_machine_cred != NULL)
90 cred = get_rpccred(clp->cl_machine_cred);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040091 return cred;
92}
93
94static void nfs4_clear_machine_cred(struct nfs_client *clp)
95{
96 struct rpc_cred *cred;
97
98 spin_lock(&clp->cl_lock);
99 cred = clp->cl_machine_cred;
100 clp->cl_machine_cred = NULL;
101 spin_unlock(&clp->cl_lock);
102 if (cred != NULL)
103 put_rpccred(cred);
104}
105
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500106struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100107{
108 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400109 struct rb_node *pos;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100110 struct rpc_cred *cred = NULL;
111
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400112 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
113 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100114 if (list_empty(&sp->so_states))
115 continue;
116 cred = get_rpccred(sp->so_cred);
117 break;
118 }
119 return cred;
120}
121
Andy Adamsonb4b82602009-04-01 09:22:49 -0400122#if defined(CONFIG_NFS_V4_1)
123
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500124static int nfs41_setup_state_renewal(struct nfs_client *clp)
125{
126 int status;
127 struct nfs_fsinfo fsinfo;
128
129 status = nfs4_proc_get_lease_time(clp, &fsinfo);
130 if (status == 0) {
131 /* Update lease time and schedule renewal */
132 spin_lock(&clp->cl_lock);
133 clp->cl_lease_time = fsinfo.lease_time * HZ;
134 clp->cl_last_renewal = jiffies;
135 spin_unlock(&clp->cl_lock);
136
137 nfs4_schedule_state_renewal(clp);
138 }
139
140 return status;
141}
142
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800143static void nfs4_end_drain_session(struct nfs_client *clp)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500144{
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800145 struct nfs4_session *ses = clp->cl_session;
Alexandros Batsakis689cf5c2009-12-14 21:27:56 -0800146 int max_slots;
147
Trond Myklebusta2118c32010-06-16 09:52:26 -0400148 if (ses == NULL)
149 return;
150 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
Alexandros Batsakis689cf5c2009-12-14 21:27:56 -0800151 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
152 max_slots = ses->fc_slot_table.max_slots;
153 while (max_slots--) {
154 struct rpc_task *task;
155
156 task = rpc_wake_up_next(&ses->fc_slot_table.
157 slot_tbl_waitq);
158 if (!task)
159 break;
160 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
161 }
162 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
163 }
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500164}
165
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800166static int nfs4_begin_drain_session(struct nfs_client *clp)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500167{
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800168 struct nfs4_session *ses = clp->cl_session;
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500169 struct nfs4_slot_table *tbl = &ses->fc_slot_table;
170
171 spin_lock(&tbl->slot_tbl_lock);
Trond Myklebusta2118c32010-06-16 09:52:26 -0400172 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500173 if (tbl->highest_used_slotid != -1) {
174 INIT_COMPLETION(ses->complete);
175 spin_unlock(&tbl->slot_tbl_lock);
176 return wait_for_completion_interruptible(&ses->complete);
177 }
178 spin_unlock(&tbl->slot_tbl_lock);
179 return 0;
180}
181
Andy Adamson4d643d12009-12-04 15:52:24 -0500182int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
183{
184 int status;
185
Trond Myklebust38045412009-12-15 17:36:57 -0500186 nfs4_begin_drain_session(clp);
Andy Adamson4d643d12009-12-04 15:52:24 -0500187 status = nfs4_proc_exchange_id(clp, cred);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500188 if (status != 0)
189 goto out;
190 status = nfs4_proc_create_session(clp);
191 if (status != 0)
192 goto out;
193 nfs41_setup_state_renewal(clp);
194 nfs_mark_client_ready(clp, NFS_CS_READY);
195out:
Andy Adamson4d643d12009-12-04 15:52:24 -0500196 return status;
197}
198
Andy Adamsonb4b82602009-04-01 09:22:49 -0400199struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
200{
201 struct rpc_cred *cred;
202
203 spin_lock(&clp->cl_lock);
204 cred = nfs4_get_machine_cred_locked(clp);
205 spin_unlock(&clp->cl_lock);
206 return cred;
207}
208
209#endif /* CONFIG_NFS_V4_1 */
210
Andy Adamsona7b72102009-04-01 09:22:46 -0400211struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
Trond Myklebust286d7d62006-01-03 09:55:26 +0100212{
213 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400214 struct rb_node *pos;
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400215 struct rpc_cred *cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100216
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500217 spin_lock(&clp->cl_lock);
218 cred = nfs4_get_machine_cred_locked(clp);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400219 if (cred != NULL)
220 goto out;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400221 pos = rb_first(&clp->cl_state_owners);
222 if (pos != NULL) {
223 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400224 cred = get_rpccred(sp->so_cred);
Trond Myklebust286d7d62006-01-03 09:55:26 +0100225 }
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400226out:
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500227 spin_unlock(&clp->cl_lock);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400228 return cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100229}
230
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400231static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
232 __u64 minval, int maxbits)
233{
234 struct rb_node **p, *parent;
235 struct nfs_unique_id *pos;
236 __u64 mask = ~0ULL;
237
238 if (maxbits < 64)
239 mask = (1ULL << maxbits) - 1ULL;
240
241 /* Ensure distribution is more or less flat */
242 get_random_bytes(&new->id, sizeof(new->id));
243 new->id &= mask;
244 if (new->id < minval)
245 new->id += minval;
246retry:
247 p = &root->rb_node;
248 parent = NULL;
249
250 while (*p != NULL) {
251 parent = *p;
252 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
253
254 if (new->id < pos->id)
255 p = &(*p)->rb_left;
256 else if (new->id > pos->id)
257 p = &(*p)->rb_right;
258 else
259 goto id_exists;
260 }
261 rb_link_node(&new->rb_node, parent, p);
262 rb_insert_color(&new->rb_node, root);
263 return;
264id_exists:
265 for (;;) {
266 new->id++;
267 if (new->id < minval || (new->id & mask) != new->id) {
268 new->id = minval;
269 break;
270 }
271 parent = rb_next(parent);
272 if (parent == NULL)
273 break;
274 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
275 if (new->id < pos->id)
276 break;
277 }
278 goto retry;
279}
280
281static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
282{
283 rb_erase(&id->rb_node, root);
284}
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286static struct nfs4_state_owner *
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400287nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400289 struct nfs_client *clp = server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400290 struct rb_node **p = &clp->cl_state_owners.rb_node,
291 *parent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 struct nfs4_state_owner *sp, *res = NULL;
293
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400294 while (*p != NULL) {
295 parent = *p;
296 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
297
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400298 if (server < sp->so_server) {
299 p = &parent->rb_left;
300 continue;
301 }
302 if (server > sp->so_server) {
303 p = &parent->rb_right;
304 continue;
305 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400306 if (cred < sp->so_cred)
307 p = &parent->rb_left;
308 else if (cred > sp->so_cred)
309 p = &parent->rb_right;
310 else {
311 atomic_inc(&sp->so_count);
312 res = sp;
313 break;
314 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 }
316 return res;
317}
318
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400319static struct nfs4_state_owner *
320nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
321{
322 struct rb_node **p = &clp->cl_state_owners.rb_node,
323 *parent = NULL;
324 struct nfs4_state_owner *sp;
325
326 while (*p != NULL) {
327 parent = *p;
328 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
329
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400330 if (new->so_server < sp->so_server) {
331 p = &parent->rb_left;
332 continue;
333 }
334 if (new->so_server > sp->so_server) {
335 p = &parent->rb_right;
336 continue;
337 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400338 if (new->so_cred < sp->so_cred)
339 p = &parent->rb_left;
340 else if (new->so_cred > sp->so_cred)
341 p = &parent->rb_right;
342 else {
343 atomic_inc(&sp->so_count);
344 return sp;
345 }
346 }
347 nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
348 rb_link_node(&new->so_client_node, parent, p);
349 rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
350 return new;
351}
352
353static void
354nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
355{
356 if (!RB_EMPTY_NODE(&sp->so_client_node))
357 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
358 nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
359}
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361/*
362 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
363 * create a new state_owner.
364 *
365 */
366static struct nfs4_state_owner *
367nfs4_alloc_state_owner(void)
368{
369 struct nfs4_state_owner *sp;
370
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400371 sp = kzalloc(sizeof(*sp),GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (!sp)
373 return NULL;
Trond Myklebustec073422005-10-20 14:22:47 -0700374 spin_lock_init(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 INIT_LIST_HEAD(&sp->so_states);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700376 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
377 sp->so_seqid.sequence = &sp->so_sequence;
378 spin_lock_init(&sp->so_sequence.lock);
379 INIT_LIST_HEAD(&sp->so_sequence.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 atomic_set(&sp->so_count, 1);
381 return sp;
382}
383
Adrian Bunk1d2e88e2008-05-02 13:42:45 -0700384static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385nfs4_drop_state_owner(struct nfs4_state_owner *sp)
386{
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400387 if (!RB_EMPTY_NODE(&sp->so_client_node)) {
Trond Myklebust1f0e8902010-06-24 15:11:43 -0400388 struct nfs_client *clp = sp->so_server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400389
390 spin_lock(&clp->cl_lock);
391 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
392 RB_CLEAR_NODE(&sp->so_client_node);
393 spin_unlock(&clp->cl_lock);
394 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395}
396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
398{
David Howells7539bba2006-08-22 20:06:09 -0400399 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 struct nfs4_state_owner *sp, *new;
401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 spin_lock(&clp->cl_lock);
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400403 sp = nfs4_find_state_owner(server, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 if (sp != NULL)
406 return sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400407 new = nfs4_alloc_state_owner();
408 if (new == NULL)
409 return NULL;
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400410 new->so_server = server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400411 new->so_cred = cred;
412 spin_lock(&clp->cl_lock);
413 sp = nfs4_insert_state_owner(clp, new);
414 spin_unlock(&clp->cl_lock);
415 if (sp == new)
416 get_rpccred(cred);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500417 else {
418 rpc_destroy_wait_queue(&new->so_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400419 kfree(new);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500420 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400421 return sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422}
423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424void nfs4_put_state_owner(struct nfs4_state_owner *sp)
425{
Trond Myklebust1f0e8902010-06-24 15:11:43 -0400426 struct nfs_client *clp = sp->so_server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 struct rpc_cred *cred = sp->so_cred;
428
429 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
430 return;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400431 nfs4_remove_state_owner(clp, sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500433 rpc_destroy_wait_queue(&sp->so_sequence.wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 put_rpccred(cred);
435 kfree(sp);
436}
437
438static struct nfs4_state *
439nfs4_alloc_open_state(void)
440{
441 struct nfs4_state *state;
442
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400443 state = kzalloc(sizeof(*state), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (!state)
445 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 atomic_set(&state->count, 1);
447 INIT_LIST_HEAD(&state->lock_states);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000448 spin_lock_init(&state->state_lock);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400449 seqlock_init(&state->seqlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 return state;
451}
452
Trond Myklebust4cecb762005-11-04 15:32:58 -0500453void
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500454nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500455{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500456 if (state->state == fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500457 return;
458 /* NB! List reordering - see the reclaim code for why. */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500459 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
460 if (fmode & FMODE_WRITE)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500461 list_move(&state->open_states, &state->owner->so_states);
462 else
463 list_move_tail(&state->open_states, &state->owner->so_states);
464 }
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500465 state->state = fmode;
Trond Myklebust4cecb762005-11-04 15:32:58 -0500466}
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468static struct nfs4_state *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
470{
471 struct nfs_inode *nfsi = NFS_I(inode);
472 struct nfs4_state *state;
473
474 list_for_each_entry(state, &nfsi->open_states, inode_states) {
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400475 if (state->owner != owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 continue;
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400477 if (atomic_inc_not_zero(&state->count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 return state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 }
480 return NULL;
481}
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483static void
484nfs4_free_open_state(struct nfs4_state *state)
485{
486 kfree(state);
487}
488
489struct nfs4_state *
490nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
491{
492 struct nfs4_state *state, *new;
493 struct nfs_inode *nfsi = NFS_I(inode);
494
495 spin_lock(&inode->i_lock);
496 state = __nfs4_find_state_byowner(inode, owner);
497 spin_unlock(&inode->i_lock);
498 if (state)
499 goto out;
500 new = nfs4_alloc_open_state();
Trond Myklebustec073422005-10-20 14:22:47 -0700501 spin_lock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 spin_lock(&inode->i_lock);
503 state = __nfs4_find_state_byowner(inode, owner);
504 if (state == NULL && new != NULL) {
505 state = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 state->owner = owner;
507 atomic_inc(&owner->so_count);
508 list_add(&state->inode_states, &nfsi->open_states);
509 state->inode = igrab(inode);
510 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700511 /* Note: The reclaim code dictates that we add stateless
512 * and read-only stateids to the end of the list */
513 list_add_tail(&state->open_states, &owner->so_states);
514 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 } else {
516 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700517 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 if (new)
519 nfs4_free_open_state(new);
520 }
521out:
522 return state;
523}
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525void nfs4_put_open_state(struct nfs4_state *state)
526{
527 struct inode *inode = state->inode;
528 struct nfs4_state_owner *owner = state->owner;
529
Trond Myklebustec073422005-10-20 14:22:47 -0700530 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 return;
Trond Myklebustec073422005-10-20 14:22:47 -0700532 spin_lock(&inode->i_lock);
Trond Myklebustba6830312007-07-27 10:23:05 -0400533 list_del(&state->inode_states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 list_del(&state->open_states);
Trond Myklebustec073422005-10-20 14:22:47 -0700535 spin_unlock(&inode->i_lock);
536 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 nfs4_free_open_state(state);
539 nfs4_put_state_owner(owner);
540}
541
542/*
Trond Myklebust83c9d412005-10-18 14:20:13 -0700543 * Close the current file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 */
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400545static void __nfs4_close(struct path *path, struct nfs4_state *state,
546 fmode_t fmode, gfp_t gfp_mask, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 struct nfs4_state_owner *owner = state->owner;
Trond Myklebust003707c2007-07-05 18:07:55 -0400549 int call_close = 0;
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500550 fmode_t newstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
552 atomic_inc(&owner->so_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 /* Protect against nfs4_find_state() */
Trond Myklebustec073422005-10-20 14:22:47 -0700554 spin_lock(&owner->so_lock);
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500555 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100556 case FMODE_READ:
557 state->n_rdonly--;
558 break;
559 case FMODE_WRITE:
560 state->n_wronly--;
561 break;
562 case FMODE_READ|FMODE_WRITE:
563 state->n_rdwr--;
564 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400565 newstate = FMODE_READ|FMODE_WRITE;
Trond Myklebuste7616922006-01-03 09:55:13 +0100566 if (state->n_rdwr == 0) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400567 if (state->n_rdonly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100568 newstate &= ~FMODE_READ;
Trond Myklebust003707c2007-07-05 18:07:55 -0400569 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
570 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
571 }
572 if (state->n_wronly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100573 newstate &= ~FMODE_WRITE;
Trond Myklebust003707c2007-07-05 18:07:55 -0400574 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
575 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
576 }
577 if (newstate == 0)
578 clear_bit(NFS_DELEGATED_STATE, &state->flags);
Trond Myklebuste7616922006-01-03 09:55:13 +0100579 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400580 nfs4_state_set_mode_locked(state, newstate);
Trond Myklebustec073422005-10-20 14:22:47 -0700581 spin_unlock(&owner->so_lock);
Trond Myklebust4cecb762005-11-04 15:32:58 -0500582
Trond Myklebust003707c2007-07-05 18:07:55 -0400583 if (!call_close) {
Trond Myklebustb39e6252007-06-11 23:05:07 -0400584 nfs4_put_open_state(state);
585 nfs4_put_state_owner(owner);
586 } else
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400587 nfs4_do_close(path, state, gfp_mask, wait);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400588}
589
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500590void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400591{
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400592 __nfs4_close(path, state, fmode, GFP_NOFS, 0);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400593}
594
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500595void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400596{
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400597 __nfs4_close(path, state, fmode, GFP_KERNEL, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598}
599
600/*
601 * Search the state->lock_states for an existing lock_owner
602 * that is compatible with current->files
603 */
604static struct nfs4_lock_state *
Trond Myklebust77041ed2010-07-01 12:49:11 -0400605__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
607 struct nfs4_lock_state *pos;
608 list_for_each_entry(pos, &state->lock_states, ls_locks) {
Trond Myklebust77041ed2010-07-01 12:49:11 -0400609 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 continue;
Trond Myklebust77041ed2010-07-01 12:49:11 -0400611 switch (pos->ls_owner.lo_type) {
612 case NFS4_POSIX_LOCK_TYPE:
613 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
614 continue;
615 break;
616 case NFS4_FLOCK_LOCK_TYPE:
617 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
618 continue;
619 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 atomic_inc(&pos->ls_count);
621 return pos;
622 }
623 return NULL;
624}
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626/*
627 * Return a compatible lock_state. If no initialized lock_state structure
628 * exists, return an uninitialized one.
629 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 */
Trond Myklebust77041ed2010-07-01 12:49:11 -0400631static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
633 struct nfs4_lock_state *lsp;
Trond Myklebust1f0e8902010-06-24 15:11:43 -0400634 struct nfs_client *clp = state->owner->so_server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400636 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 if (lsp == NULL)
638 return NULL;
Trond Myklebustd0dc3702008-01-10 16:07:54 -0500639 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
640 spin_lock_init(&lsp->ls_sequence.lock);
641 INIT_LIST_HEAD(&lsp->ls_sequence.list);
642 lsp->ls_seqid.sequence = &lsp->ls_sequence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 atomic_set(&lsp->ls_count, 1);
Trond Myklebustb64aec82009-07-21 16:47:46 -0400644 lsp->ls_state = state;
Trond Myklebust77041ed2010-07-01 12:49:11 -0400645 lsp->ls_owner.lo_type = type;
646 switch (lsp->ls_owner.lo_type) {
647 case NFS4_FLOCK_LOCK_TYPE:
648 lsp->ls_owner.lo_u.flock_owner = fl_pid;
649 break;
650 case NFS4_POSIX_LOCK_TYPE:
651 lsp->ls_owner.lo_u.posix_owner = fl_owner;
652 break;
653 default:
654 kfree(lsp);
655 return NULL;
656 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 spin_lock(&clp->cl_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400658 nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 spin_unlock(&clp->cl_lock);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000660 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 return lsp;
662}
663
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400664static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
665{
Trond Myklebust1f0e8902010-06-24 15:11:43 -0400666 struct nfs_client *clp = lsp->ls_state->owner->so_server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400667
668 spin_lock(&clp->cl_lock);
669 nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
670 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500671 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400672 kfree(lsp);
673}
674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675/*
676 * Return a compatible lock_state. If no initialized lock_state structure
677 * exists, return an uninitialized one.
678 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 */
Trond Myklebust77041ed2010-07-01 12:49:11 -0400680static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000682 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000684 for(;;) {
685 spin_lock(&state->state_lock);
Trond Myklebust77041ed2010-07-01 12:49:11 -0400686 lsp = __nfs4_find_lock_state(state, owner, pid, type);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000687 if (lsp != NULL)
688 break;
689 if (new != NULL) {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000690 list_add(&new->ls_locks, &state->lock_states);
691 set_bit(LK_STATE_IN_USE, &state->flags);
692 lsp = new;
693 new = NULL;
694 break;
695 }
696 spin_unlock(&state->state_lock);
Trond Myklebust77041ed2010-07-01 12:49:11 -0400697 new = nfs4_alloc_lock_state(state, owner, pid, type);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000698 if (new == NULL)
699 return NULL;
700 }
701 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400702 if (new != NULL)
703 nfs4_free_lock_state(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 return lsp;
705}
706
707/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000708 * Release reference to lock_state, and free it if we see that
709 * it is no longer in use
710 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700711void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000712{
713 struct nfs4_state *state;
714
715 if (lsp == NULL)
716 return;
717 state = lsp->ls_state;
718 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
719 return;
720 list_del(&lsp->ls_locks);
721 if (list_empty(&state->lock_states))
722 clear_bit(LK_STATE_IN_USE, &state->flags);
723 spin_unlock(&state->state_lock);
Trond Myklebustd3c7b7c2010-07-01 12:49:01 -0400724 if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
725 nfs4_release_lockowner(lsp);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400726 nfs4_free_lock_state(lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000727}
728
729static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
730{
731 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
732
733 dst->fl_u.nfs4_fl.owner = lsp;
734 atomic_inc(&lsp->ls_count);
735}
736
737static void nfs4_fl_release_lock(struct file_lock *fl)
738{
739 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
740}
741
Alexey Dobriyan6aed6282009-09-21 17:01:11 -0700742static const struct file_lock_operations nfs4_fl_lock_ops = {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000743 .fl_copy_lock = nfs4_fl_copy_lock,
744 .fl_release_private = nfs4_fl_release_lock,
745};
746
747int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
748{
749 struct nfs4_lock_state *lsp;
750
751 if (fl->fl_ops != NULL)
752 return 0;
Trond Myklebust77041ed2010-07-01 12:49:11 -0400753 if (fl->fl_flags & FL_POSIX)
754 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
755 else if (fl->fl_flags & FL_FLOCK)
756 lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
757 else
758 return -EINVAL;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000759 if (lsp == NULL)
760 return -ENOMEM;
761 fl->fl_u.nfs4_fl.owner = lsp;
762 fl->fl_ops = &nfs4_fl_lock_ops;
763 return 0;
764}
765
766/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 * Byte-range lock aware utility to initialize the stateid of read/write
768 * requests.
769 */
Trond Myklebust77041ed2010-07-01 12:49:11 -0400770void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000772 struct nfs4_lock_state *lsp;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400773 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400775 do {
776 seq = read_seqbegin(&state->seqlock);
777 memcpy(dst, &state->stateid, sizeof(*dst));
778 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000779 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
780 return;
781
782 spin_lock(&state->state_lock);
Trond Myklebust77041ed2010-07-01 12:49:11 -0400783 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000784 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
785 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
786 spin_unlock(&state->state_lock);
787 nfs4_put_lock_state(lsp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400790struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791{
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700792 struct nfs_seqid *new;
793
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400794 new = kmalloc(sizeof(*new), gfp_mask);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700795 if (new != NULL) {
796 new->sequence = counter;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500797 INIT_LIST_HEAD(&new->list);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700798 }
799 return new;
800}
801
Trond Myklebust72211db2009-12-15 14:47:36 -0500802void nfs_release_seqid(struct nfs_seqid *seqid)
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700803{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500804 if (!list_empty(&seqid->list)) {
805 struct rpc_sequence *sequence = seqid->sequence->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700806
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500807 spin_lock(&sequence->lock);
Trond Myklebust72211db2009-12-15 14:47:36 -0500808 list_del_init(&seqid->list);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500809 spin_unlock(&sequence->lock);
810 rpc_wake_up(&sequence->wait);
811 }
Trond Myklebust72211db2009-12-15 14:47:36 -0500812}
813
814void nfs_free_seqid(struct nfs_seqid *seqid)
815{
816 nfs_release_seqid(seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700817 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818}
819
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700821 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
822 * failed with a seqid incrementing error -
823 * see comments nfs_fs.h:seqid_mutating_error()
824 */
Trond Myklebust88d90932007-07-02 14:03:03 -0400825static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500827 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700828 switch (status) {
829 case 0:
830 break;
831 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400832 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
833 return;
834 printk(KERN_WARNING "NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -0800835 " sequence-id error on an"
836 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400837 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700838 case -NFS4ERR_STALE_CLIENTID:
839 case -NFS4ERR_STALE_STATEID:
840 case -NFS4ERR_BAD_STATEID:
841 case -NFS4ERR_BADXDR:
842 case -NFS4ERR_RESOURCE:
843 case -NFS4ERR_NOFILEHANDLE:
844 /* Non-seqid mutating errors */
845 return;
846 };
847 /*
848 * Note: no locking needed as we are guaranteed to be first
849 * on the sequence list
850 */
851 seqid->sequence->counter++;
852}
853
854void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
855{
Benny Halevy34dc1ad2009-04-01 09:22:52 -0400856 struct nfs4_state_owner *sp = container_of(seqid->sequence,
857 struct nfs4_state_owner, so_seqid);
858 struct nfs_server *server = sp->so_server;
859
860 if (status == -NFS4ERR_BAD_SEQID)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 nfs4_drop_state_owner(sp);
Benny Halevy34dc1ad2009-04-01 09:22:52 -0400862 if (!nfs4_has_session(server->nfs_client))
863 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700864}
865
866/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700867 * Increment the seqid if the LOCK/LOCKU succeeded, or
868 * failed with a seqid incrementing error -
869 * see comments nfs_fs.h:seqid_mutating_error()
870 */
871void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
872{
Trond Myklebust88d90932007-07-02 14:03:03 -0400873 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700874}
875
876int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
877{
878 struct rpc_sequence *sequence = seqid->sequence->sequence;
879 int status = 0;
880
881 spin_lock(&sequence->lock);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500882 if (list_empty(&seqid->list))
883 list_add_tail(&seqid->list, &sequence->list);
884 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
885 goto unlock;
Trond Myklebust5d008372008-02-22 16:34:17 -0500886 rpc_sleep_on(&sequence->wait, task, NULL);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500887 status = -EAGAIN;
888unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700889 spin_unlock(&sequence->lock);
890 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891}
892
Trond Myklebuste005e802008-12-23 15:21:48 -0500893static int nfs4_run_state_manager(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
Trond Myklebuste005e802008-12-23 15:21:48 -0500895static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +0100896{
897 smp_mb__before_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -0500898 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100899 smp_mb__after_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -0500900 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
Trond Myklebust433fbe42006-01-03 09:55:22 +0100901 rpc_wake_up(&clp->cl_rpcwaitq);
902}
903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904/*
Trond Myklebuste005e802008-12-23 15:21:48 -0500905 * Schedule the nfs_client asynchronous state management routine
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 */
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500907void nfs4_schedule_state_manager(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908{
Trond Myklebust5043e902006-01-03 09:55:23 +0100909 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910
Trond Myklebuste005e802008-12-23 15:21:48 -0500911 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
912 return;
Trond Myklebust5043e902006-01-03 09:55:23 +0100913 __module_get(THIS_MODULE);
914 atomic_inc(&clp->cl_count);
Trond Myklebuste005e802008-12-23 15:21:48 -0500915 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
Chuck Lever5d8515c2007-12-10 14:57:16 -0500916 rpc_peeraddr2str(clp->cl_rpcclient,
917 RPC_DISPLAY_ADDR));
Trond Myklebust5043e902006-01-03 09:55:23 +0100918 if (!IS_ERR(task))
919 return;
Trond Myklebuste005e802008-12-23 15:21:48 -0500920 nfs4_clear_state_manager_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -0400921 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +0100922 module_put(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923}
924
925/*
926 * Schedule a state recovery attempt
927 */
David Howellsadfa6f92006-08-22 20:06:08 -0400928void nfs4_schedule_state_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929{
930 if (!clp)
931 return;
Trond Myklebuste598d842008-12-23 15:21:42 -0500932 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
933 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Trond Myklebuste005e802008-12-23 15:21:48 -0500934 nfs4_schedule_state_manager(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935}
936
Trond Myklebusta2c0b9e2010-01-26 15:42:47 -0500937int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500938{
939
940 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
941 /* Don't recover state that expired before the reboot */
942 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
943 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
944 return 0;
945 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -0500946 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500947 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
948 return 1;
949}
950
Trond Myklebust9e33bed2008-12-23 15:21:46 -0500951int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500952{
953 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
954 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
Trond Myklebust7eff03a2008-12-23 15:21:43 -0500955 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -0500956 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
957 return 1;
958}
959
Trond Myklebust02860012008-12-23 15:21:40 -0500960static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
962 struct inode *inode = state->inode;
Trond Myklebust19e03c52008-12-23 15:21:44 -0500963 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 struct file_lock *fl;
965 int status = 0;
966
Trond Myklebust3f09df72009-06-17 13:23:00 -0700967 if (inode->i_flock == NULL)
968 return 0;
969
970 /* Guard against delegation returns and new lock/unlock calls */
Trond Myklebust19e03c52008-12-23 15:21:44 -0500971 down_write(&nfsi->rwsem);
Trond Myklebust3f09df72009-06-17 13:23:00 -0700972 /* Protect inode->i_flock using the BKL */
973 lock_kernel();
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800974 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
Trond Myklebust43b2a332005-11-04 15:35:30 -0500975 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 continue;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400977 if (nfs_file_open_context(fl->fl_file)->state != state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 continue;
Trond Myklebust3f09df72009-06-17 13:23:00 -0700979 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 status = ops->recover_lock(state, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 switch (status) {
Trond Myklebust965b5d62009-06-17 13:22:59 -0700982 case 0:
983 break;
984 case -ESTALE:
985 case -NFS4ERR_ADMIN_REVOKED:
986 case -NFS4ERR_STALE_STATEID:
987 case -NFS4ERR_BAD_STATEID:
988 case -NFS4ERR_EXPIRED:
989 case -NFS4ERR_NO_GRACE:
990 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -0500991 case -NFS4ERR_BADSESSION:
992 case -NFS4ERR_BADSLOT:
993 case -NFS4ERR_BAD_HIGH_SLOT:
994 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Trond Myklebust965b5d62009-06-17 13:22:59 -0700995 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 default:
997 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700998 __func__, status);
Trond Myklebust965b5d62009-06-17 13:22:59 -0700999 case -ENOMEM:
1000 case -NFS4ERR_DENIED:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 case -NFS4ERR_RECLAIM_BAD:
1002 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust43b2a332005-11-04 15:35:30 -05001003 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
Trond Myklebust965b5d62009-06-17 13:22:59 -07001004 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 }
Trond Myklebust3f09df72009-06-17 13:23:00 -07001006 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 }
Trond Myklebust3f09df72009-06-17 13:23:00 -07001008 unlock_kernel();
Trond Myklebust965b5d62009-06-17 13:22:59 -07001009out:
Trond Myklebust19e03c52008-12-23 15:21:44 -05001010 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 return status;
1012}
1013
Trond Myklebust02860012008-12-23 15:21:40 -05001014static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015{
1016 struct nfs4_state *state;
1017 struct nfs4_lock_state *lock;
1018 int status = 0;
1019
1020 /* Note: we rely on the sp->so_states list being ordered
1021 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1022 * states first.
1023 * This is needed to ensure that the server won't give us any
1024 * read delegations that we have to return if, say, we are
1025 * recovering after a network partition or a reboot from a
1026 * server that doesn't support a grace period.
1027 */
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001028restart:
1029 spin_lock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001031 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1032 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 if (state->state == 0)
1034 continue;
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001035 atomic_inc(&state->count);
1036 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 if (status >= 0) {
Trond Myklebust02860012008-12-23 15:21:40 -05001039 status = nfs4_reclaim_locks(state, ops);
1040 if (status >= 0) {
1041 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1042 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1043 printk("%s: Lock reclaim failed!\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001044 __func__);
Trond Myklebust02860012008-12-23 15:21:40 -05001045 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001046 nfs4_put_open_state(state);
1047 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 }
1050 switch (status) {
1051 default:
1052 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001053 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 case -ENOENT:
Trond Myklebust965b5d62009-06-17 13:22:59 -07001055 case -ENOMEM:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001056 case -ESTALE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 /*
1058 * Open state on this file cannot be recovered
1059 * All we can do is revert to using the zero stateid.
1060 */
1061 memset(state->stateid.data, 0,
1062 sizeof(state->stateid.data));
1063 /* Mark the file as being 'closed' */
1064 state->state = 0;
1065 break;
Trond Myklebust965b5d62009-06-17 13:22:59 -07001066 case -NFS4ERR_ADMIN_REVOKED:
1067 case -NFS4ERR_STALE_STATEID:
1068 case -NFS4ERR_BAD_STATEID:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001069 case -NFS4ERR_RECLAIM_BAD:
1070 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001071 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001072 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 case -NFS4ERR_EXPIRED:
1074 case -NFS4ERR_NO_GRACE:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001075 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -05001077 case -NFS4ERR_BADSESSION:
1078 case -NFS4ERR_BADSLOT:
1079 case -NFS4ERR_BAD_HIGH_SLOT:
1080 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 goto out_err;
1082 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001083 nfs4_put_open_state(state);
1084 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001086 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 return 0;
1088out_err:
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001089 nfs4_put_open_state(state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 return status;
1091}
1092
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001093static void nfs4_clear_open_state(struct nfs4_state *state)
1094{
1095 struct nfs4_lock_state *lock;
1096
1097 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1098 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1099 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1100 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1101 list_for_each_entry(lock, &state->lock_states, ls_locks) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001102 lock->ls_seqid.flags = 0;
1103 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1104 }
1105}
1106
1107static 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 -07001108{
1109 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001110 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001111 struct nfs4_state *state;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001112
1113 /* Reset all sequence ids to zero */
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001114 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1115 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001116 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -07001117 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001118 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001119 if (mark_reclaim(clp, state))
1120 nfs4_clear_open_state(state);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001121 }
Trond Myklebustec073422005-10-20 14:22:47 -07001122 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001123 }
1124}
1125
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001126static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1127{
1128 /* Mark all delegations for reclaim */
1129 nfs_delegation_mark_reclaim(clp);
1130 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1131}
1132
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001133static void nfs4_reclaim_complete(struct nfs_client *clp,
1134 const struct nfs4_state_recovery_ops *ops)
1135{
1136 /* Notify the server we're done reclaiming our state */
1137 if (ops->reclaim_complete)
1138 (void)ops->reclaim_complete(clp);
1139}
1140
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001141static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1142{
1143 struct nfs4_state_owner *sp;
1144 struct rb_node *pos;
1145 struct nfs4_state *state;
1146
1147 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1148 return;
1149
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001150 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
Ricardo Labiaga7cab89b2009-12-08 14:35:28 -05001151
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001152 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1153 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1154 spin_lock(&sp->so_lock);
1155 list_for_each_entry(state, &sp->so_states, open_states) {
1156 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
1157 continue;
1158 nfs4_state_mark_reclaim_nograce(clp, state);
1159 }
1160 spin_unlock(&sp->so_lock);
1161 }
1162
1163 nfs_delegation_reap_unclaimed(clp);
1164}
1165
1166static void nfs_delegation_clear_all(struct nfs_client *clp)
1167{
1168 nfs_delegation_mark_reclaim(clp);
1169 nfs_delegation_reap_unclaimed(clp);
1170}
1171
1172static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1173{
1174 nfs_delegation_clear_all(clp);
1175 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1176}
1177
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001178static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
Trond Myklebuste598d842008-12-23 15:21:42 -05001179{
1180 switch (error) {
1181 case -NFS4ERR_CB_PATH_DOWN:
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001182 nfs_handle_cb_pathdown(clp);
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001183 return 0;
Trond Myklebustc8b7ae3d2009-12-03 15:53:21 -05001184 case -NFS4ERR_NO_GRACE:
1185 nfs4_state_end_reclaim_reboot(clp);
1186 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001187 case -NFS4ERR_STALE_CLIENTID:
1188 case -NFS4ERR_LEASE_MOVED:
1189 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Trond Myklebuste345e882009-12-03 15:52:41 -05001190 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebuste598d842008-12-23 15:21:42 -05001191 nfs4_state_start_reclaim_reboot(clp);
1192 break;
1193 case -NFS4ERR_EXPIRED:
1194 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1195 nfs4_state_start_reclaim_nograce(clp);
Andy Adamson8ba9bf82009-12-04 15:55:34 -05001196 break;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001197 case -NFS4ERR_BADSESSION:
1198 case -NFS4ERR_BADSLOT:
1199 case -NFS4ERR_BAD_HIGH_SLOT:
1200 case -NFS4ERR_DEADSESSION:
1201 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1202 case -NFS4ERR_SEQ_FALSE_RETRY:
1203 case -NFS4ERR_SEQ_MISORDERED:
Andy Adamson6df08182009-12-04 15:55:05 -05001204 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
Andy Adamson0b9e2d42009-12-04 16:02:14 -05001205 /* Zero session reset errors */
1206 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001207 }
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001208 return error;
Trond Myklebuste598d842008-12-23 15:21:42 -05001209}
1210
Trond Myklebust02860012008-12-23 15:21:40 -05001211static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212{
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001213 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 int status = 0;
1215
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001216restart:
1217 spin_lock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001218 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1219 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001220 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1221 continue;
1222 atomic_inc(&sp->so_count);
1223 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001224 status = nfs4_reclaim_open_state(sp, ops);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001225 if (status < 0) {
1226 set_bit(ops->owner_flag_bit, &sp->so_flags);
1227 nfs4_put_state_owner(sp);
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001228 return nfs4_recovery_handle_error(clp, status);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001229 }
1230 nfs4_put_state_owner(sp);
1231 goto restart;
Trond Myklebust02860012008-12-23 15:21:40 -05001232 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001233 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001234 return status;
1235}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
Trond Myklebust02860012008-12-23 15:21:40 -05001237static int nfs4_check_lease(struct nfs_client *clp)
1238{
1239 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001240 const struct nfs4_state_maintenance_ops *ops =
1241 clp->cl_mvops->state_renewal_ops;
Trond Myklebust02860012008-12-23 15:21:40 -05001242 int status = -NFS4ERR_EXPIRED;
1243
Trond Myklebust0f605b52008-12-23 15:21:42 -05001244 /* Is the client already known to have an expired lease? */
1245 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1246 return 0;
Andy Adamsona7b72102009-04-01 09:22:46 -04001247 spin_lock(&clp->cl_lock);
1248 cred = ops->get_state_renewal_cred_locked(clp);
1249 spin_unlock(&clp->cl_lock);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001250 if (cred == NULL) {
1251 cred = nfs4_get_setclientid_cred(clp);
1252 if (cred == NULL)
1253 goto out;
Trond Myklebust02860012008-12-23 15:21:40 -05001254 }
Benny Halevy8e69514f2009-04-01 09:22:45 -04001255 status = ops->renew_lease(clp, cred);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001256 put_rpccred(cred);
1257out:
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001258 return nfs4_recovery_handle_error(clp, status);
Trond Myklebust02860012008-12-23 15:21:40 -05001259}
1260
1261static int nfs4_reclaim_lease(struct nfs_client *clp)
1262{
1263 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001264 const struct nfs4_state_recovery_ops *ops =
1265 clp->cl_mvops->reboot_recovery_ops;
Trond Myklebust02860012008-12-23 15:21:40 -05001266 int status = -ENOENT;
1267
Andy Adamson90a16612009-04-01 09:22:48 -04001268 cred = ops->get_clid_cred(clp);
Trond Myklebust02860012008-12-23 15:21:40 -05001269 if (cred != NULL) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001270 status = ops->establish_clid(clp, cred);
Trond Myklebust02860012008-12-23 15:21:40 -05001271 put_rpccred(cred);
1272 /* Handle case where the user hasn't set up machine creds */
1273 if (status == -EACCES && cred == clp->cl_machine_cred) {
1274 nfs4_clear_machine_cred(clp);
1275 status = -EAGAIN;
1276 }
Benny Halevyc2e713d2009-04-01 09:21:51 -04001277 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1278 status = -EPROTONOSUPPORT;
Trond Myklebust02860012008-12-23 15:21:40 -05001279 }
1280 return status;
1281}
1282
Andy Adamson76db6d92009-04-01 09:22:38 -04001283#ifdef CONFIG_NFS_V4_1
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001284void nfs41_handle_recall_slot(struct nfs_client *clp)
1285{
1286 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1287 nfs4_schedule_state_recovery(clp);
1288}
1289
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001290static void nfs4_reset_all_state(struct nfs_client *clp)
1291{
1292 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1293 clp->cl_boot_time = CURRENT_TIME;
1294 nfs4_state_start_reclaim_nograce(clp);
1295 nfs4_schedule_state_recovery(clp);
1296 }
1297}
1298
1299static void nfs41_handle_server_reboot(struct nfs_client *clp)
1300{
1301 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1302 nfs4_state_start_reclaim_reboot(clp);
1303 nfs4_schedule_state_recovery(clp);
1304 }
1305}
1306
1307static void nfs41_handle_state_revoked(struct nfs_client *clp)
1308{
1309 /* Temporary */
1310 nfs4_reset_all_state(clp);
1311}
1312
1313static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1314{
1315 /* This will need to handle layouts too */
1316 nfs_expire_all_delegations(clp);
1317}
1318
1319static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1320{
1321 nfs_expire_all_delegations(clp);
1322 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1323 nfs4_schedule_state_recovery(clp);
1324}
1325
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001326void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1327{
1328 if (!flags)
1329 return;
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001330 else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1331 nfs41_handle_server_reboot(clp);
1332 else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001333 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1334 SEQ4_STATUS_ADMIN_STATE_REVOKED |
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001335 SEQ4_STATUS_LEASE_MOVED))
1336 nfs41_handle_state_revoked(clp);
1337 else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1338 nfs41_handle_recallable_state_revoked(clp);
1339 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001340 SEQ4_STATUS_BACKCHANNEL_FAULT |
1341 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001342 nfs41_handle_cb_path_down(clp);
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001343}
1344
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001345static int nfs4_reset_session(struct nfs_client *clp)
1346{
1347 int status;
1348
Trond Myklebust38045412009-12-15 17:36:57 -05001349 nfs4_begin_drain_session(clp);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001350 status = nfs4_proc_destroy_session(clp->cl_session);
1351 if (status && status != -NFS4ERR_BADSESSION &&
1352 status != -NFS4ERR_DEADSESSION) {
Ricardo Labiagaf4558482009-12-07 09:16:09 -05001353 status = nfs4_recovery_handle_error(clp, status);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001354 goto out;
1355 }
1356
1357 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
Trond Myklebustf26468f2009-12-05 19:32:11 -05001358 status = nfs4_proc_create_session(clp);
Andy Adamson41f54a52010-01-21 14:54:13 -05001359 if (status) {
Ricardo Labiagaf4558482009-12-07 09:16:09 -05001360 status = nfs4_recovery_handle_error(clp, status);
Andy Adamson41f54a52010-01-21 14:54:13 -05001361 goto out;
1362 }
1363 /* create_session negotiated new slot table */
1364 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -05001365
Andy Adamson41f54a52010-01-21 14:54:13 -05001366 /* Let the state manager reestablish state */
1367 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001368 nfs41_setup_state_renewal(clp);
Andy Adamson41f54a52010-01-21 14:54:13 -05001369out:
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001370 return status;
1371}
Andy Adamson76db6d92009-04-01 09:22:38 -04001372
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001373static int nfs4_recall_slot(struct nfs_client *clp)
1374{
1375 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1376 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1377 struct nfs4_slot *new, *old;
1378 int i;
1379
1380 nfs4_begin_drain_session(clp);
1381 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
Trond Myklebust8535b2b2010-05-13 12:51:01 -04001382 GFP_NOFS);
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001383 if (!new)
1384 return -ENOMEM;
1385
1386 spin_lock(&fc_tbl->slot_tbl_lock);
1387 for (i = 0; i < fc_tbl->target_max_slots; i++)
1388 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1389 old = fc_tbl->slots;
1390 fc_tbl->slots = new;
1391 fc_tbl->max_slots = fc_tbl->target_max_slots;
1392 fc_tbl->target_max_slots = 0;
1393 fc_attrs->max_reqs = fc_tbl->max_slots;
1394 spin_unlock(&fc_tbl->slot_tbl_lock);
1395
1396 kfree(old);
1397 nfs4_end_drain_session(clp);
1398 return 0;
1399}
1400
Andy Adamson76db6d92009-04-01 09:22:38 -04001401#else /* CONFIG_NFS_V4_1 */
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001402static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001403static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001404static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
Andy Adamson76db6d92009-04-01 09:22:38 -04001405#endif /* CONFIG_NFS_V4_1 */
1406
Andy Adamson78722e92009-06-16 14:43:15 -04001407/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1408 * on EXCHANGE_ID for v4.1
1409 */
1410static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1411{
1412 if (nfs4_has_session(clp)) {
1413 switch (status) {
1414 case -NFS4ERR_DELAY:
1415 case -NFS4ERR_CLID_INUSE:
1416 case -EAGAIN:
Jeff Layton2c643482010-01-07 09:42:03 -05001417 case -EKEYEXPIRED:
Andy Adamson78722e92009-06-16 14:43:15 -04001418 break;
1419
1420 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1421 * in nfs4_exchange_id */
1422 default:
1423 return;
1424 }
1425 }
1426 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1427}
1428
Trond Myklebuste005e802008-12-23 15:21:48 -05001429static void nfs4_state_manager(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05001430{
Trond Myklebust02860012008-12-23 15:21:40 -05001431 int status = 0;
1432
Trond Myklebust02860012008-12-23 15:21:40 -05001433 /* Ensure exclusive access to NFSv4 state */
Trond Myklebustf3c76492008-12-23 15:21:48 -05001434 for(;;) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001435 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1436 /* We're going to have to re-establish a clientid */
1437 status = nfs4_reclaim_lease(clp);
1438 if (status) {
Andy Adamson78722e92009-06-16 14:43:15 -04001439 nfs4_set_lease_expired(clp, status);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001440 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1441 &clp->cl_state))
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001442 continue;
Andy Adamson76db6d92009-04-01 09:22:38 -04001443 if (clp->cl_cons_state ==
1444 NFS_CS_SESSION_INITING)
1445 nfs_mark_client_ready(clp, status);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001446 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 }
Trond Myklebuste598d842008-12-23 15:21:42 -05001448 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Ricardo Labiaga7cab89b2009-12-08 14:35:28 -05001449 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
Trond Myklebuste598d842008-12-23 15:21:42 -05001450 }
1451
1452 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1453 status = nfs4_check_lease(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001454 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
Trond Myklebuste598d842008-12-23 15:21:42 -05001455 continue;
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001456 if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1457 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001459
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001460 /* Initialize or reset the session */
Andy Adamson6df08182009-12-04 15:55:05 -05001461 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
Trond Myklebust7111dc72009-08-24 19:21:29 -04001462 && nfs4_has_session(clp)) {
Andy Adamson4d643d12009-12-04 15:52:24 -05001463 status = nfs4_reset_session(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001464 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1465 continue;
1466 if (status < 0)
Andy Adamson76db6d92009-04-01 09:22:38 -04001467 goto out_error;
Andy Adamson76db6d92009-04-01 09:22:38 -04001468 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001469
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001470 /* First recover reboot state... */
Trond Myklebuste345e882009-12-03 15:52:41 -05001471 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001472 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001473 clp->cl_mvops->reboot_recovery_ops);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001474 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
Andy Adamson6df08182009-12-04 15:55:05 -05001475 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001476 continue;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001477 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001478 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1479 continue;
1480 if (status < 0)
1481 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001482 }
1483
1484 /* Now recover expired state... */
1485 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001486 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001487 clp->cl_mvops->nograce_recovery_ops);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001488 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
Andy Adamson6df08182009-12-04 15:55:05 -05001489 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001490 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1491 continue;
1492 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001493 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001494 }
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001495
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001496 nfs4_end_drain_session(clp);
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001497 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1498 nfs_client_return_marked_delegations(clp);
1499 continue;
1500 }
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001501 /* Recall session slots */
1502 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1503 && nfs4_has_session(clp)) {
1504 status = nfs4_recall_slot(clp);
1505 if (status < 0)
1506 goto out_error;
1507 continue;
1508 }
1509
Trond Myklebuste005e802008-12-23 15:21:48 -05001510
1511 nfs4_clear_state_manager_bit(clp);
Trond Myklebustf3c76492008-12-23 15:21:48 -05001512 /* Did we race with an attempt to give us more work? */
1513 if (clp->cl_state == 0)
1514 break;
1515 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1516 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 }
Trond Myklebuste005e802008-12-23 15:21:48 -05001518 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519out_error:
Trond Myklebuste005e802008-12-23 15:21:48 -05001520 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
Chuck Lever5d8515c2007-12-10 14:57:16 -05001521 " with error %d\n", clp->cl_hostname, -status);
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001522 nfs4_end_drain_session(clp);
Trond Myklebuste005e802008-12-23 15:21:48 -05001523 nfs4_clear_state_manager_bit(clp);
1524}
1525
1526static int nfs4_run_state_manager(void *ptr)
1527{
1528 struct nfs_client *clp = ptr;
1529
1530 allow_signal(SIGKILL);
1531 nfs4_state_manager(clp);
1532 nfs_put_client(clp);
1533 module_put_and_exit(0);
1534 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535}
1536
1537/*
1538 * Local variables:
1539 * c-basic-offset: 8
1540 * End:
1541 */