blob: 036f5adc9e1fad417eb13c2b8687e6ea56abb613 [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>
Arnd Bergmannb89f4322010-09-18 15:09:31 +020043#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#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>
Randy Dunlap8c7597f2010-10-22 16:18:52 -070049#include <linux/ratelimit.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/workqueue.h>
51#include <linux/bitops.h>
52
Trond Myklebust4ce79712005-06-22 17:16:21 +000053#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include "callback.h"
55#include "delegation.h"
David Howells24c8dbb2006-08-22 20:06:10 -040056#include "internal.h"
Andy Adamson974cec82010-10-20 00:18:02 -040057#include "pnfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59#define OPENOWNER_POOL_SIZE 8
60
Trond Myklebust4ce79712005-06-22 17:16:21 +000061const nfs4_stateid zero_stateid;
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static LIST_HEAD(nfs4_clientid_list);
64
Andy Adamson591d71c2009-04-01 09:22:47 -040065int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
Trond Myklebustfd954ae2011-04-24 14:28:18 -040067 struct nfs4_setclientid_res clid = {
68 .clientid = clp->cl_clientid,
69 .confirm = clp->cl_confirm,
70 };
Chuck Leverf738f512009-03-18 20:48:06 -040071 unsigned short port;
72 int status;
73
Trond Myklebustfd954ae2011-04-24 14:28:18 -040074 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
75 goto do_confirm;
Chuck Leverf738f512009-03-18 20:48:06 -040076 port = nfs_callback_tcpport;
77 if (clp->cl_addr.ss_family == AF_INET6)
78 port = nfs_callback_tcpport6;
79
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040080 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
81 if (status != 0)
82 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -040083 clp->cl_clientid = clid.clientid;
84 clp->cl_confirm = clid.confirm;
85 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
86do_confirm:
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040087 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
88 if (status != 0)
89 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -040090 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040091 nfs4_schedule_state_renewal(clp);
92out:
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return status;
94}
95
Andy Adamsona7b72102009-04-01 09:22:46 -040096struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
Trond Myklebusta2b2bb82008-04-08 16:02:17 -040097{
98 struct rpc_cred *cred = NULL;
99
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400100 if (clp->cl_machine_cred != NULL)
101 cred = get_rpccred(clp->cl_machine_cred);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400102 return cred;
103}
104
105static void nfs4_clear_machine_cred(struct nfs_client *clp)
106{
107 struct rpc_cred *cred;
108
109 spin_lock(&clp->cl_lock);
110 cred = clp->cl_machine_cred;
111 clp->cl_machine_cred = NULL;
112 spin_unlock(&clp->cl_lock);
113 if (cred != NULL)
114 put_rpccred(cred);
115}
116
Chuck Lever24d292b2010-12-24 01:32:43 +0000117static struct rpc_cred *
118nfs4_get_renew_cred_server_locked(struct nfs_server *server)
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100119{
Chuck Lever24d292b2010-12-24 01:32:43 +0000120 struct rpc_cred *cred = NULL;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100121 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400122 struct rb_node *pos;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100123
Chuck Lever24d292b2010-12-24 01:32:43 +0000124 for (pos = rb_first(&server->state_owners);
125 pos != NULL;
126 pos = rb_next(pos)) {
127 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100128 if (list_empty(&sp->so_states))
129 continue;
130 cred = get_rpccred(sp->so_cred);
131 break;
132 }
133 return cred;
134}
135
Chuck Lever24d292b2010-12-24 01:32:43 +0000136/**
137 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
138 * @clp: client state handle
139 *
140 * Returns an rpc_cred with reference count bumped, or NULL.
141 * Caller must hold clp->cl_lock.
142 */
143struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
144{
145 struct rpc_cred *cred = NULL;
146 struct nfs_server *server;
147
148 rcu_read_lock();
149 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
150 cred = nfs4_get_renew_cred_server_locked(server);
151 if (cred != NULL)
152 break;
153 }
154 rcu_read_unlock();
155 return cred;
156}
157
Andy Adamsonb4b82602009-04-01 09:22:49 -0400158#if defined(CONFIG_NFS_V4_1)
159
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500160static int nfs41_setup_state_renewal(struct nfs_client *clp)
161{
162 int status;
163 struct nfs_fsinfo fsinfo;
164
Andy Adamsond6fb79d2011-03-01 01:34:11 +0000165 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
166 nfs4_schedule_state_renewal(clp);
167 return 0;
168 }
169
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500170 status = nfs4_proc_get_lease_time(clp, &fsinfo);
171 if (status == 0) {
172 /* Update lease time and schedule renewal */
173 spin_lock(&clp->cl_lock);
174 clp->cl_lease_time = fsinfo.lease_time * HZ;
175 clp->cl_last_renewal = jiffies;
176 spin_unlock(&clp->cl_lock);
177
178 nfs4_schedule_state_renewal(clp);
179 }
180
181 return status;
182}
183
Andy Adamson42acd022011-01-06 02:04:34 +0000184/*
185 * Back channel returns NFS4ERR_DELAY for new requests when
186 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
187 * is ended.
188 */
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800189static void nfs4_end_drain_session(struct nfs_client *clp)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500190{
Alexandros Batsakis5601a002009-12-14 21:27:58 -0800191 struct nfs4_session *ses = clp->cl_session;
Alexandros Batsakis689cf5c2009-12-14 21:27:56 -0800192 int max_slots;
193
Trond Myklebusta2118c32010-06-16 09:52:26 -0400194 if (ses == NULL)
195 return;
196 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
Alexandros Batsakis689cf5c2009-12-14 21:27:56 -0800197 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
198 max_slots = ses->fc_slot_table.max_slots;
199 while (max_slots--) {
200 struct rpc_task *task;
201
202 task = rpc_wake_up_next(&ses->fc_slot_table.
203 slot_tbl_waitq);
204 if (!task)
205 break;
206 rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
207 }
208 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
209 }
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500210}
211
Andy Adamson42acd022011-01-06 02:04:34 +0000212static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500213{
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500214 spin_lock(&tbl->slot_tbl_lock);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500215 if (tbl->highest_used_slotid != -1) {
Andy Adamson42acd022011-01-06 02:04:34 +0000216 INIT_COMPLETION(tbl->complete);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500217 spin_unlock(&tbl->slot_tbl_lock);
Andy Adamson42acd022011-01-06 02:04:34 +0000218 return wait_for_completion_interruptible(&tbl->complete);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500219 }
220 spin_unlock(&tbl->slot_tbl_lock);
221 return 0;
222}
223
Andy Adamson42acd022011-01-06 02:04:34 +0000224static int nfs4_begin_drain_session(struct nfs_client *clp)
225{
226 struct nfs4_session *ses = clp->cl_session;
227 int ret = 0;
228
229 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
230 /* back channel */
231 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
232 if (ret)
233 return ret;
234 /* fore channel */
235 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
236}
237
Andy Adamson4d643d12009-12-04 15:52:24 -0500238int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
239{
240 int status;
241
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400242 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
243 goto do_confirm;
Trond Myklebust38045412009-12-15 17:36:57 -0500244 nfs4_begin_drain_session(clp);
Andy Adamson4d643d12009-12-04 15:52:24 -0500245 status = nfs4_proc_exchange_id(clp, cred);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500246 if (status != 0)
247 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400248 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
249do_confirm:
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500250 status = nfs4_proc_create_session(clp);
251 if (status != 0)
252 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400253 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500254 nfs41_setup_state_renewal(clp);
255 nfs_mark_client_ready(clp, NFS_CS_READY);
256out:
Andy Adamson4d643d12009-12-04 15:52:24 -0500257 return status;
258}
259
Andy Adamsonb4b82602009-04-01 09:22:49 -0400260struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
261{
262 struct rpc_cred *cred;
263
264 spin_lock(&clp->cl_lock);
265 cred = nfs4_get_machine_cred_locked(clp);
266 spin_unlock(&clp->cl_lock);
267 return cred;
268}
269
270#endif /* CONFIG_NFS_V4_1 */
271
Chuck Lever24d292b2010-12-24 01:32:43 +0000272static struct rpc_cred *
273nfs4_get_setclientid_cred_server(struct nfs_server *server)
Trond Myklebust286d7d62006-01-03 09:55:26 +0100274{
Chuck Lever24d292b2010-12-24 01:32:43 +0000275 struct nfs_client *clp = server->nfs_client;
276 struct rpc_cred *cred = NULL;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100277 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400278 struct rb_node *pos;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100279
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500280 spin_lock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000281 pos = rb_first(&server->state_owners);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400282 if (pos != NULL) {
Chuck Lever24d292b2010-12-24 01:32:43 +0000283 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400284 cred = get_rpccred(sp->so_cred);
Trond Myklebust286d7d62006-01-03 09:55:26 +0100285 }
Trond Myklebust6dc9d572008-12-23 15:21:41 -0500286 spin_unlock(&clp->cl_lock);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400287 return cred;
Trond Myklebust286d7d62006-01-03 09:55:26 +0100288}
289
Chuck Lever24d292b2010-12-24 01:32:43 +0000290/**
291 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
292 * @clp: client state handle
293 *
294 * Returns an rpc_cred with reference count bumped, or NULL.
295 */
296struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
297{
298 struct nfs_server *server;
299 struct rpc_cred *cred;
300
301 spin_lock(&clp->cl_lock);
302 cred = nfs4_get_machine_cred_locked(clp);
303 spin_unlock(&clp->cl_lock);
304 if (cred != NULL)
305 goto out;
306
307 rcu_read_lock();
308 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
309 cred = nfs4_get_setclientid_cred_server(server);
310 if (cred != NULL)
311 break;
312 }
313 rcu_read_unlock();
314
315out:
316 return cred;
317}
318
319static void nfs_alloc_unique_id_locked(struct rb_root *root,
320 struct nfs_unique_id *new,
321 __u64 minval, int maxbits)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400322{
323 struct rb_node **p, *parent;
324 struct nfs_unique_id *pos;
325 __u64 mask = ~0ULL;
326
327 if (maxbits < 64)
328 mask = (1ULL << maxbits) - 1ULL;
329
330 /* Ensure distribution is more or less flat */
331 get_random_bytes(&new->id, sizeof(new->id));
332 new->id &= mask;
333 if (new->id < minval)
334 new->id += minval;
335retry:
336 p = &root->rb_node;
337 parent = NULL;
338
339 while (*p != NULL) {
340 parent = *p;
341 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
342
343 if (new->id < pos->id)
344 p = &(*p)->rb_left;
345 else if (new->id > pos->id)
346 p = &(*p)->rb_right;
347 else
348 goto id_exists;
349 }
350 rb_link_node(&new->rb_node, parent, p);
351 rb_insert_color(&new->rb_node, root);
352 return;
353id_exists:
354 for (;;) {
355 new->id++;
356 if (new->id < minval || (new->id & mask) != new->id) {
357 new->id = minval;
358 break;
359 }
360 parent = rb_next(parent);
361 if (parent == NULL)
362 break;
363 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
364 if (new->id < pos->id)
365 break;
366 }
367 goto retry;
368}
369
370static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
371{
372 rb_erase(&id->rb_node, root);
373}
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375static struct nfs4_state_owner *
Chuck Lever24d292b2010-12-24 01:32:43 +0000376nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
Chuck Lever24d292b2010-12-24 01:32:43 +0000378 struct rb_node **p = &server->state_owners.rb_node,
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400379 *parent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 struct nfs4_state_owner *sp, *res = NULL;
381
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400382 while (*p != NULL) {
383 parent = *p;
Chuck Lever24d292b2010-12-24 01:32:43 +0000384 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400385
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400386 if (server < sp->so_server) {
387 p = &parent->rb_left;
388 continue;
389 }
390 if (server > sp->so_server) {
391 p = &parent->rb_right;
392 continue;
393 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400394 if (cred < sp->so_cred)
395 p = &parent->rb_left;
396 else if (cred > sp->so_cred)
397 p = &parent->rb_right;
398 else {
399 atomic_inc(&sp->so_count);
400 res = sp;
401 break;
402 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 }
404 return res;
405}
406
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400407static struct nfs4_state_owner *
Chuck Lever24d292b2010-12-24 01:32:43 +0000408nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400409{
Chuck Lever24d292b2010-12-24 01:32:43 +0000410 struct nfs_server *server = new->so_server;
411 struct rb_node **p = &server->state_owners.rb_node,
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400412 *parent = NULL;
413 struct nfs4_state_owner *sp;
414
415 while (*p != NULL) {
416 parent = *p;
Chuck Lever24d292b2010-12-24 01:32:43 +0000417 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400418
419 if (new->so_cred < sp->so_cred)
420 p = &parent->rb_left;
421 else if (new->so_cred > sp->so_cred)
422 p = &parent->rb_right;
423 else {
424 atomic_inc(&sp->so_count);
425 return sp;
426 }
427 }
Chuck Lever24d292b2010-12-24 01:32:43 +0000428 nfs_alloc_unique_id_locked(&server->openowner_id,
429 &new->so_owner_id, 1, 64);
430 rb_link_node(&new->so_server_node, parent, p);
431 rb_insert_color(&new->so_server_node, &server->state_owners);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400432 return new;
433}
434
435static void
Chuck Lever24d292b2010-12-24 01:32:43 +0000436nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400437{
Chuck Lever24d292b2010-12-24 01:32:43 +0000438 struct nfs_server *server = sp->so_server;
439
440 if (!RB_EMPTY_NODE(&sp->so_server_node))
441 rb_erase(&sp->so_server_node, &server->state_owners);
442 nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400443}
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445/*
446 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
447 * create a new state_owner.
448 *
449 */
450static struct nfs4_state_owner *
451nfs4_alloc_state_owner(void)
452{
453 struct nfs4_state_owner *sp;
454
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400455 sp = kzalloc(sizeof(*sp),GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if (!sp)
457 return NULL;
Trond Myklebustec073422005-10-20 14:22:47 -0700458 spin_lock_init(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 INIT_LIST_HEAD(&sp->so_states);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700460 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
461 sp->so_seqid.sequence = &sp->so_sequence;
462 spin_lock_init(&sp->so_sequence.lock);
463 INIT_LIST_HEAD(&sp->so_sequence.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 atomic_set(&sp->so_count, 1);
465 return sp;
466}
467
Adrian Bunk1d2e88e2008-05-02 13:42:45 -0700468static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469nfs4_drop_state_owner(struct nfs4_state_owner *sp)
470{
Chuck Lever24d292b2010-12-24 01:32:43 +0000471 if (!RB_EMPTY_NODE(&sp->so_server_node)) {
472 struct nfs_server *server = sp->so_server;
473 struct nfs_client *clp = server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400474
475 spin_lock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000476 rb_erase(&sp->so_server_node, &server->state_owners);
477 RB_CLEAR_NODE(&sp->so_server_node);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400478 spin_unlock(&clp->cl_lock);
479 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
Chuck Lever24d292b2010-12-24 01:32:43 +0000482/**
483 * nfs4_get_state_owner - Look up a state owner given a credential
484 * @server: nfs_server to search
485 * @cred: RPC credential to match
486 *
487 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
488 */
489struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
490 struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491{
David Howells7539bba2006-08-22 20:06:09 -0400492 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 struct nfs4_state_owner *sp, *new;
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 spin_lock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000496 sp = nfs4_find_state_owner_locked(server, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 if (sp != NULL)
499 return sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400500 new = nfs4_alloc_state_owner();
501 if (new == NULL)
502 return NULL;
Trond Myklebust6f2e64d2007-07-06 10:53:21 -0400503 new->so_server = server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400504 new->so_cred = cred;
505 spin_lock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000506 sp = nfs4_insert_state_owner_locked(new);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400507 spin_unlock(&clp->cl_lock);
508 if (sp == new)
509 get_rpccred(cred);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500510 else {
511 rpc_destroy_wait_queue(&new->so_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400512 kfree(new);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500513 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400514 return sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515}
516
Chuck Lever24d292b2010-12-24 01:32:43 +0000517/**
518 * nfs4_put_state_owner - Release a nfs4_state_owner
519 * @sp: state owner data to release
520 *
521 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522void nfs4_put_state_owner(struct nfs4_state_owner *sp)
523{
Trond Myklebust1f0e8902010-06-24 15:11:43 -0400524 struct nfs_client *clp = sp->so_server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 struct rpc_cred *cred = sp->so_cred;
526
527 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
528 return;
Chuck Lever24d292b2010-12-24 01:32:43 +0000529 nfs4_remove_state_owner_locked(sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500531 rpc_destroy_wait_queue(&sp->so_sequence.wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 put_rpccred(cred);
533 kfree(sp);
534}
535
536static struct nfs4_state *
537nfs4_alloc_open_state(void)
538{
539 struct nfs4_state *state;
540
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400541 state = kzalloc(sizeof(*state), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 if (!state)
543 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 atomic_set(&state->count, 1);
545 INIT_LIST_HEAD(&state->lock_states);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000546 spin_lock_init(&state->state_lock);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400547 seqlock_init(&state->seqlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return state;
549}
550
Trond Myklebust4cecb762005-11-04 15:32:58 -0500551void
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500552nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500553{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500554 if (state->state == fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500555 return;
556 /* NB! List reordering - see the reclaim code for why. */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500557 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
558 if (fmode & FMODE_WRITE)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500559 list_move(&state->open_states, &state->owner->so_states);
560 else
561 list_move_tail(&state->open_states, &state->owner->so_states);
562 }
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500563 state->state = fmode;
Trond Myklebust4cecb762005-11-04 15:32:58 -0500564}
565
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566static struct nfs4_state *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
568{
569 struct nfs_inode *nfsi = NFS_I(inode);
570 struct nfs4_state *state;
571
572 list_for_each_entry(state, &nfsi->open_states, inode_states) {
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400573 if (state->owner != owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 continue;
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400575 if (atomic_inc_not_zero(&state->count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 }
578 return NULL;
579}
580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581static void
582nfs4_free_open_state(struct nfs4_state *state)
583{
584 kfree(state);
585}
586
587struct nfs4_state *
588nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
589{
590 struct nfs4_state *state, *new;
591 struct nfs_inode *nfsi = NFS_I(inode);
592
593 spin_lock(&inode->i_lock);
594 state = __nfs4_find_state_byowner(inode, owner);
595 spin_unlock(&inode->i_lock);
596 if (state)
597 goto out;
598 new = nfs4_alloc_open_state();
Trond Myklebustec073422005-10-20 14:22:47 -0700599 spin_lock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 spin_lock(&inode->i_lock);
601 state = __nfs4_find_state_byowner(inode, owner);
602 if (state == NULL && new != NULL) {
603 state = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 state->owner = owner;
605 atomic_inc(&owner->so_count);
606 list_add(&state->inode_states, &nfsi->open_states);
Dave Chinner0444d762011-03-29 18:08:50 +1100607 ihold(inode);
608 state->inode = inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700610 /* Note: The reclaim code dictates that we add stateless
611 * and read-only stateids to the end of the list */
612 list_add_tail(&state->open_states, &owner->so_states);
613 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 } else {
615 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700616 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 if (new)
618 nfs4_free_open_state(new);
619 }
620out:
621 return state;
622}
623
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624void nfs4_put_open_state(struct nfs4_state *state)
625{
626 struct inode *inode = state->inode;
627 struct nfs4_state_owner *owner = state->owner;
628
Trond Myklebustec073422005-10-20 14:22:47 -0700629 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 return;
Trond Myklebustec073422005-10-20 14:22:47 -0700631 spin_lock(&inode->i_lock);
Trond Myklebustba6830312007-07-27 10:23:05 -0400632 list_del(&state->inode_states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 list_del(&state->open_states);
Trond Myklebustec073422005-10-20 14:22:47 -0700634 spin_unlock(&inode->i_lock);
635 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 nfs4_free_open_state(state);
638 nfs4_put_state_owner(owner);
639}
640
641/*
Trond Myklebust83c9d412005-10-18 14:20:13 -0700642 * Close the current file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 */
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400644static void __nfs4_close(struct path *path, struct nfs4_state *state,
645 fmode_t fmode, gfp_t gfp_mask, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 struct nfs4_state_owner *owner = state->owner;
Trond Myklebust003707c2007-07-05 18:07:55 -0400648 int call_close = 0;
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500649 fmode_t newstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
651 atomic_inc(&owner->so_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 /* Protect against nfs4_find_state() */
Trond Myklebustec073422005-10-20 14:22:47 -0700653 spin_lock(&owner->so_lock);
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500654 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100655 case FMODE_READ:
656 state->n_rdonly--;
657 break;
658 case FMODE_WRITE:
659 state->n_wronly--;
660 break;
661 case FMODE_READ|FMODE_WRITE:
662 state->n_rdwr--;
663 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400664 newstate = FMODE_READ|FMODE_WRITE;
Trond Myklebuste7616922006-01-03 09:55:13 +0100665 if (state->n_rdwr == 0) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400666 if (state->n_rdonly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100667 newstate &= ~FMODE_READ;
Trond Myklebust003707c2007-07-05 18:07:55 -0400668 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
669 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
670 }
671 if (state->n_wronly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100672 newstate &= ~FMODE_WRITE;
Trond Myklebust003707c2007-07-05 18:07:55 -0400673 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
674 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
675 }
676 if (newstate == 0)
677 clear_bit(NFS_DELEGATED_STATE, &state->flags);
Trond Myklebuste7616922006-01-03 09:55:13 +0100678 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400679 nfs4_state_set_mode_locked(state, newstate);
Trond Myklebustec073422005-10-20 14:22:47 -0700680 spin_unlock(&owner->so_lock);
Trond Myklebust4cecb762005-11-04 15:32:58 -0500681
Trond Myklebust003707c2007-07-05 18:07:55 -0400682 if (!call_close) {
Trond Myklebustb39e6252007-06-11 23:05:07 -0400683 nfs4_put_open_state(state);
684 nfs4_put_state_owner(owner);
Fred Isamanf7e89172011-01-06 11:36:32 +0000685 } else {
686 bool roc = pnfs_roc(state->inode);
687
688 nfs4_do_close(path, state, gfp_mask, wait, roc);
689 }
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400690}
691
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500692void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400693{
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400694 __nfs4_close(path, state, fmode, GFP_NOFS, 0);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400695}
696
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500697void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400698{
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400699 __nfs4_close(path, state, fmode, GFP_KERNEL, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700}
701
702/*
703 * Search the state->lock_states for an existing lock_owner
704 * that is compatible with current->files
705 */
706static struct nfs4_lock_state *
Trond Myklebust77041ed2010-07-01 12:49:11 -0400707__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 -0700708{
709 struct nfs4_lock_state *pos;
710 list_for_each_entry(pos, &state->lock_states, ls_locks) {
Trond Myklebust77041ed2010-07-01 12:49:11 -0400711 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 continue;
Trond Myklebust77041ed2010-07-01 12:49:11 -0400713 switch (pos->ls_owner.lo_type) {
714 case NFS4_POSIX_LOCK_TYPE:
715 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
716 continue;
717 break;
718 case NFS4_FLOCK_LOCK_TYPE:
719 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
720 continue;
721 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 atomic_inc(&pos->ls_count);
723 return pos;
724 }
725 return NULL;
726}
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728/*
729 * Return a compatible lock_state. If no initialized lock_state structure
730 * exists, return an uninitialized one.
731 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 */
Trond Myklebust77041ed2010-07-01 12:49:11 -0400733static 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 -0700734{
735 struct nfs4_lock_state *lsp;
Chuck Lever24d292b2010-12-24 01:32:43 +0000736 struct nfs_server *server = state->owner->so_server;
737 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400739 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 if (lsp == NULL)
741 return NULL;
Trond Myklebustd0dc3702008-01-10 16:07:54 -0500742 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
743 spin_lock_init(&lsp->ls_sequence.lock);
744 INIT_LIST_HEAD(&lsp->ls_sequence.list);
745 lsp->ls_seqid.sequence = &lsp->ls_sequence;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 atomic_set(&lsp->ls_count, 1);
Trond Myklebustb64aec82009-07-21 16:47:46 -0400747 lsp->ls_state = state;
Trond Myklebust77041ed2010-07-01 12:49:11 -0400748 lsp->ls_owner.lo_type = type;
749 switch (lsp->ls_owner.lo_type) {
750 case NFS4_FLOCK_LOCK_TYPE:
751 lsp->ls_owner.lo_u.flock_owner = fl_pid;
752 break;
753 case NFS4_POSIX_LOCK_TYPE:
754 lsp->ls_owner.lo_u.posix_owner = fl_owner;
755 break;
756 default:
757 kfree(lsp);
758 return NULL;
759 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 spin_lock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000761 nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 spin_unlock(&clp->cl_lock);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000763 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 return lsp;
765}
766
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400767static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
768{
Chuck Lever24d292b2010-12-24 01:32:43 +0000769 struct nfs_server *server = lsp->ls_state->owner->so_server;
770 struct nfs_client *clp = server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400771
772 spin_lock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000773 nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400774 spin_unlock(&clp->cl_lock);
Trond Myklebustf6a1cc82008-02-22 17:06:55 -0500775 rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400776 kfree(lsp);
777}
778
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779/*
780 * Return a compatible lock_state. If no initialized lock_state structure
781 * exists, return an uninitialized one.
782 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 */
Trond Myklebust77041ed2010-07-01 12:49:11 -0400784static 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 -0700785{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000786 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000788 for(;;) {
789 spin_lock(&state->state_lock);
Trond Myklebust77041ed2010-07-01 12:49:11 -0400790 lsp = __nfs4_find_lock_state(state, owner, pid, type);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000791 if (lsp != NULL)
792 break;
793 if (new != NULL) {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000794 list_add(&new->ls_locks, &state->lock_states);
795 set_bit(LK_STATE_IN_USE, &state->flags);
796 lsp = new;
797 new = NULL;
798 break;
799 }
800 spin_unlock(&state->state_lock);
Trond Myklebust77041ed2010-07-01 12:49:11 -0400801 new = nfs4_alloc_lock_state(state, owner, pid, type);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000802 if (new == NULL)
803 return NULL;
804 }
805 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400806 if (new != NULL)
807 nfs4_free_lock_state(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 return lsp;
809}
810
811/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000812 * Release reference to lock_state, and free it if we see that
813 * it is no longer in use
814 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700815void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000816{
817 struct nfs4_state *state;
818
819 if (lsp == NULL)
820 return;
821 state = lsp->ls_state;
822 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
823 return;
824 list_del(&lsp->ls_locks);
825 if (list_empty(&state->lock_states))
826 clear_bit(LK_STATE_IN_USE, &state->flags);
827 spin_unlock(&state->state_lock);
Trond Myklebustd3c7b7c2010-07-01 12:49:01 -0400828 if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
829 nfs4_release_lockowner(lsp);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400830 nfs4_free_lock_state(lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000831}
832
833static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
834{
835 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
836
837 dst->fl_u.nfs4_fl.owner = lsp;
838 atomic_inc(&lsp->ls_count);
839}
840
841static void nfs4_fl_release_lock(struct file_lock *fl)
842{
843 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
844}
845
Alexey Dobriyan6aed6282009-09-21 17:01:11 -0700846static const struct file_lock_operations nfs4_fl_lock_ops = {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000847 .fl_copy_lock = nfs4_fl_copy_lock,
848 .fl_release_private = nfs4_fl_release_lock,
849};
850
851int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
852{
853 struct nfs4_lock_state *lsp;
854
855 if (fl->fl_ops != NULL)
856 return 0;
Trond Myklebust77041ed2010-07-01 12:49:11 -0400857 if (fl->fl_flags & FL_POSIX)
858 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
859 else if (fl->fl_flags & FL_FLOCK)
860 lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE);
861 else
862 return -EINVAL;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000863 if (lsp == NULL)
864 return -ENOMEM;
865 fl->fl_u.nfs4_fl.owner = lsp;
866 fl->fl_ops = &nfs4_fl_lock_ops;
867 return 0;
868}
869
870/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 * Byte-range lock aware utility to initialize the stateid of read/write
872 * requests.
873 */
Trond Myklebust77041ed2010-07-01 12:49:11 -0400874void 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 -0700875{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000876 struct nfs4_lock_state *lsp;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400877 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400879 do {
880 seq = read_seqbegin(&state->seqlock);
881 memcpy(dst, &state->stateid, sizeof(*dst));
882 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000883 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
884 return;
885
886 spin_lock(&state->state_lock);
Trond Myklebust77041ed2010-07-01 12:49:11 -0400887 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000888 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
889 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
890 spin_unlock(&state->state_lock);
891 nfs4_put_lock_state(lsp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892}
893
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400894struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700896 struct nfs_seqid *new;
897
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400898 new = kmalloc(sizeof(*new), gfp_mask);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700899 if (new != NULL) {
900 new->sequence = counter;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500901 INIT_LIST_HEAD(&new->list);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700902 }
903 return new;
904}
905
Trond Myklebust72211db2009-12-15 14:47:36 -0500906void nfs_release_seqid(struct nfs_seqid *seqid)
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700907{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500908 if (!list_empty(&seqid->list)) {
909 struct rpc_sequence *sequence = seqid->sequence->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700910
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500911 spin_lock(&sequence->lock);
Trond Myklebust72211db2009-12-15 14:47:36 -0500912 list_del_init(&seqid->list);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500913 spin_unlock(&sequence->lock);
914 rpc_wake_up(&sequence->wait);
915 }
Trond Myklebust72211db2009-12-15 14:47:36 -0500916}
917
918void nfs_free_seqid(struct nfs_seqid *seqid)
919{
920 nfs_release_seqid(seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700921 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922}
923
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700925 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
926 * failed with a seqid incrementing error -
927 * see comments nfs_fs.h:seqid_mutating_error()
928 */
Trond Myklebust88d90932007-07-02 14:03:03 -0400929static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930{
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500931 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700932 switch (status) {
933 case 0:
934 break;
935 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400936 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
937 return;
938 printk(KERN_WARNING "NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -0800939 " sequence-id error on an"
940 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -0400941 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700942 case -NFS4ERR_STALE_CLIENTID:
943 case -NFS4ERR_STALE_STATEID:
944 case -NFS4ERR_BAD_STATEID:
945 case -NFS4ERR_BADXDR:
946 case -NFS4ERR_RESOURCE:
947 case -NFS4ERR_NOFILEHANDLE:
948 /* Non-seqid mutating errors */
949 return;
950 };
951 /*
952 * Note: no locking needed as we are guaranteed to be first
953 * on the sequence list
954 */
955 seqid->sequence->counter++;
956}
957
958void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
959{
Benny Halevy34dc1ad2009-04-01 09:22:52 -0400960 struct nfs4_state_owner *sp = container_of(seqid->sequence,
961 struct nfs4_state_owner, so_seqid);
962 struct nfs_server *server = sp->so_server;
963
964 if (status == -NFS4ERR_BAD_SEQID)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 nfs4_drop_state_owner(sp);
Benny Halevy34dc1ad2009-04-01 09:22:52 -0400966 if (!nfs4_has_session(server->nfs_client))
967 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700968}
969
970/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700971 * Increment the seqid if the LOCK/LOCKU succeeded, or
972 * failed with a seqid incrementing error -
973 * see comments nfs_fs.h:seqid_mutating_error()
974 */
975void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
976{
Trond Myklebust88d90932007-07-02 14:03:03 -0400977 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700978}
979
980int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
981{
982 struct rpc_sequence *sequence = seqid->sequence->sequence;
983 int status = 0;
984
985 spin_lock(&sequence->lock);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500986 if (list_empty(&seqid->list))
987 list_add_tail(&seqid->list, &sequence->list);
988 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
989 goto unlock;
Trond Myklebust5d008372008-02-22 16:34:17 -0500990 rpc_sleep_on(&sequence->wait, task, NULL);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -0500991 status = -EAGAIN;
992unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -0700993 spin_unlock(&sequence->lock);
994 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995}
996
Trond Myklebuste005e802008-12-23 15:21:48 -0500997static int nfs4_run_state_manager(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
Trond Myklebuste005e802008-12-23 15:21:48 -0500999static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +01001000{
1001 smp_mb__before_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -05001002 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
Trond Myklebust433fbe42006-01-03 09:55:22 +01001003 smp_mb__after_clear_bit();
Trond Myklebuste005e802008-12-23 15:21:48 -05001004 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
Trond Myklebust433fbe42006-01-03 09:55:22 +01001005 rpc_wake_up(&clp->cl_rpcwaitq);
1006}
1007
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008/*
Trond Myklebuste005e802008-12-23 15:21:48 -05001009 * Schedule the nfs_client asynchronous state management routine
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 */
Trond Myklebustb0d3ded2008-12-23 15:21:50 -05001011void nfs4_schedule_state_manager(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012{
Trond Myklebust5043e902006-01-03 09:55:23 +01001013 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
Trond Myklebuste005e802008-12-23 15:21:48 -05001015 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1016 return;
Trond Myklebust5043e902006-01-03 09:55:23 +01001017 __module_get(THIS_MODULE);
1018 atomic_inc(&clp->cl_count);
Trond Myklebuste005e802008-12-23 15:21:48 -05001019 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
Chuck Lever5d8515c2007-12-10 14:57:16 -05001020 rpc_peeraddr2str(clp->cl_rpcclient,
1021 RPC_DISPLAY_ADDR));
Trond Myklebust5043e902006-01-03 09:55:23 +01001022 if (!IS_ERR(task))
1023 return;
Trond Myklebuste005e802008-12-23 15:21:48 -05001024 nfs4_clear_state_manager_bit(clp);
David Howells24c8dbb2006-08-22 20:06:10 -04001025 nfs_put_client(clp);
Trond Myklebust5043e902006-01-03 09:55:23 +01001026 module_put(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027}
1028
1029/*
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001030 * Schedule a lease recovery attempt
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 */
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001032void nfs4_schedule_lease_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033{
1034 if (!clp)
1035 return;
Trond Myklebuste598d842008-12-23 15:21:42 -05001036 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1037 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Trond Myklebuste005e802008-12-23 15:21:48 -05001038 nfs4_schedule_state_manager(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039}
1040
Trond Myklebustf9feab12011-03-09 16:12:46 -05001041static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001042{
1043
1044 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1045 /* Don't recover state that expired before the reboot */
1046 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1047 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1048 return 0;
1049 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001050 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001051 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1052 return 1;
1053}
1054
Trond Myklebustf9feab12011-03-09 16:12:46 -05001055static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001056{
1057 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1058 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001059 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001060 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1061 return 1;
1062}
1063
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001064void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1065{
1066 struct nfs_client *clp = server->nfs_client;
1067
1068 nfs4_state_mark_reclaim_nograce(clp, state);
1069 nfs4_schedule_state_manager(clp);
1070}
1071
Trond Myklebust02860012008-12-23 15:21:40 -05001072static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073{
1074 struct inode *inode = state->inode;
Trond Myklebust19e03c52008-12-23 15:21:44 -05001075 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 struct file_lock *fl;
1077 int status = 0;
1078
Trond Myklebust3f09df72009-06-17 13:23:00 -07001079 if (inode->i_flock == NULL)
1080 return 0;
1081
1082 /* Guard against delegation returns and new lock/unlock calls */
Trond Myklebust19e03c52008-12-23 15:21:44 -05001083 down_write(&nfsi->rwsem);
Trond Myklebust3f09df72009-06-17 13:23:00 -07001084 /* Protect inode->i_flock using the BKL */
Arnd Bergmannb89f4322010-09-18 15:09:31 +02001085 lock_flocks();
Harvey Harrison90dc7d22008-02-20 13:03:05 -08001086 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
Trond Myklebust43b2a332005-11-04 15:35:30 -05001087 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 continue;
Trond Myklebustcd3758e2007-08-10 17:44:32 -04001089 if (nfs_file_open_context(fl->fl_file)->state != state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 continue;
Arnd Bergmannb89f4322010-09-18 15:09:31 +02001091 unlock_flocks();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 status = ops->recover_lock(state, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 switch (status) {
Trond Myklebust965b5d62009-06-17 13:22:59 -07001094 case 0:
1095 break;
1096 case -ESTALE:
1097 case -NFS4ERR_ADMIN_REVOKED:
1098 case -NFS4ERR_STALE_STATEID:
1099 case -NFS4ERR_BAD_STATEID:
1100 case -NFS4ERR_EXPIRED:
1101 case -NFS4ERR_NO_GRACE:
1102 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -05001103 case -NFS4ERR_BADSESSION:
1104 case -NFS4ERR_BADSLOT:
1105 case -NFS4ERR_BAD_HIGH_SLOT:
1106 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Trond Myklebust965b5d62009-06-17 13:22:59 -07001107 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 default:
1109 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001110 __func__, status);
Trond Myklebust965b5d62009-06-17 13:22:59 -07001111 case -ENOMEM:
1112 case -NFS4ERR_DENIED:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 case -NFS4ERR_RECLAIM_BAD:
1114 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust43b2a332005-11-04 15:35:30 -05001115 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
Trond Myklebust965b5d62009-06-17 13:22:59 -07001116 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 }
Arnd Bergmannb89f4322010-09-18 15:09:31 +02001118 lock_flocks();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 }
Arnd Bergmannb89f4322010-09-18 15:09:31 +02001120 unlock_flocks();
Trond Myklebust965b5d62009-06-17 13:22:59 -07001121out:
Trond Myklebust19e03c52008-12-23 15:21:44 -05001122 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 return status;
1124}
1125
Trond Myklebust02860012008-12-23 15:21:40 -05001126static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127{
1128 struct nfs4_state *state;
1129 struct nfs4_lock_state *lock;
1130 int status = 0;
1131
1132 /* Note: we rely on the sp->so_states list being ordered
1133 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1134 * states first.
1135 * This is needed to ensure that the server won't give us any
1136 * read delegations that we have to return if, say, we are
1137 * recovering after a network partition or a reboot from a
1138 * server that doesn't support a grace period.
1139 */
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001140restart:
1141 spin_lock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001143 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1144 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 if (state->state == 0)
1146 continue;
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001147 atomic_inc(&state->count);
1148 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 if (status >= 0) {
Trond Myklebust02860012008-12-23 15:21:40 -05001151 status = nfs4_reclaim_locks(state, ops);
1152 if (status >= 0) {
1153 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1154 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1155 printk("%s: Lock reclaim failed!\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001156 __func__);
Trond Myklebust02860012008-12-23 15:21:40 -05001157 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001158 nfs4_put_open_state(state);
1159 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 }
1162 switch (status) {
1163 default:
1164 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001165 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 case -ENOENT:
Trond Myklebust965b5d62009-06-17 13:22:59 -07001167 case -ENOMEM:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001168 case -ESTALE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 /*
1170 * Open state on this file cannot be recovered
1171 * All we can do is revert to using the zero stateid.
1172 */
1173 memset(state->stateid.data, 0,
1174 sizeof(state->stateid.data));
1175 /* Mark the file as being 'closed' */
1176 state->state = 0;
1177 break;
Trond Myklebust168667c2010-10-19 19:47:49 -04001178 case -EKEYEXPIRED:
1179 /*
1180 * User RPCSEC_GSS context has expired.
1181 * We cannot recover this stateid now, so
1182 * skip it and allow recovery thread to
1183 * proceed.
1184 */
1185 break;
Trond Myklebust965b5d62009-06-17 13:22:59 -07001186 case -NFS4ERR_ADMIN_REVOKED:
1187 case -NFS4ERR_STALE_STATEID:
1188 case -NFS4ERR_BAD_STATEID:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001189 case -NFS4ERR_RECLAIM_BAD:
1190 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001191 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001192 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 case -NFS4ERR_EXPIRED:
1194 case -NFS4ERR_NO_GRACE:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001195 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -05001197 case -NFS4ERR_BADSESSION:
1198 case -NFS4ERR_BADSLOT:
1199 case -NFS4ERR_BAD_HIGH_SLOT:
1200 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 goto out_err;
1202 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001203 nfs4_put_open_state(state);
1204 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001206 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 return 0;
1208out_err:
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001209 nfs4_put_open_state(state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 return status;
1211}
1212
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001213static void nfs4_clear_open_state(struct nfs4_state *state)
1214{
1215 struct nfs4_lock_state *lock;
1216
1217 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1218 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1219 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1220 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1221 list_for_each_entry(lock, &state->lock_states, ls_locks) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001222 lock->ls_seqid.flags = 0;
1223 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1224 }
1225}
1226
Chuck Lever24d292b2010-12-24 01:32:43 +00001227static void nfs4_reset_seqids(struct nfs_server *server,
1228 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001229{
Chuck Lever24d292b2010-12-24 01:32:43 +00001230 struct nfs_client *clp = server->nfs_client;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001231 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001232 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001233 struct nfs4_state *state;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001234
Chuck Lever24d292b2010-12-24 01:32:43 +00001235 spin_lock(&clp->cl_lock);
1236 for (pos = rb_first(&server->state_owners);
1237 pos != NULL;
1238 pos = rb_next(pos)) {
1239 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001240 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -07001241 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001242 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001243 if (mark_reclaim(clp, state))
1244 nfs4_clear_open_state(state);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001245 }
Trond Myklebustec073422005-10-20 14:22:47 -07001246 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001247 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001248 spin_unlock(&clp->cl_lock);
1249}
1250
1251static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1252 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1253{
1254 struct nfs_server *server;
1255
1256 rcu_read_lock();
1257 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1258 nfs4_reset_seqids(server, mark_reclaim);
1259 rcu_read_unlock();
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001260}
1261
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001262static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1263{
1264 /* Mark all delegations for reclaim */
1265 nfs_delegation_mark_reclaim(clp);
1266 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1267}
1268
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001269static void nfs4_reclaim_complete(struct nfs_client *clp,
1270 const struct nfs4_state_recovery_ops *ops)
1271{
1272 /* Notify the server we're done reclaiming our state */
1273 if (ops->reclaim_complete)
1274 (void)ops->reclaim_complete(clp);
1275}
1276
Chuck Lever24d292b2010-12-24 01:32:43 +00001277static void nfs4_clear_reclaim_server(struct nfs_server *server)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001278{
Chuck Lever24d292b2010-12-24 01:32:43 +00001279 struct nfs_client *clp = server->nfs_client;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001280 struct nfs4_state_owner *sp;
1281 struct rb_node *pos;
1282 struct nfs4_state *state;
1283
Chuck Lever24d292b2010-12-24 01:32:43 +00001284 spin_lock(&clp->cl_lock);
1285 for (pos = rb_first(&server->state_owners);
1286 pos != NULL;
1287 pos = rb_next(pos)) {
1288 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001289 spin_lock(&sp->so_lock);
1290 list_for_each_entry(state, &sp->so_states, open_states) {
Chuck Lever24d292b2010-12-24 01:32:43 +00001291 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1292 &state->flags))
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001293 continue;
1294 nfs4_state_mark_reclaim_nograce(clp, state);
1295 }
1296 spin_unlock(&sp->so_lock);
1297 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001298 spin_unlock(&clp->cl_lock);
1299}
1300
1301static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1302{
1303 struct nfs_server *server;
1304
1305 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1306 return 0;
1307
1308 rcu_read_lock();
1309 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1310 nfs4_clear_reclaim_server(server);
1311 rcu_read_unlock();
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001312
1313 nfs_delegation_reap_unclaimed(clp);
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001314 return 1;
1315}
1316
1317static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1318{
1319 if (!nfs4_state_clear_reclaim_reboot(clp))
1320 return;
1321 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001322}
1323
1324static void nfs_delegation_clear_all(struct nfs_client *clp)
1325{
1326 nfs_delegation_mark_reclaim(clp);
1327 nfs_delegation_reap_unclaimed(clp);
1328}
1329
1330static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1331{
1332 nfs_delegation_clear_all(clp);
1333 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1334}
1335
Trond Myklebust168667c2010-10-19 19:47:49 -04001336static void nfs4_warn_keyexpired(const char *s)
1337{
1338 printk_ratelimited(KERN_WARNING "Error: state manager"
1339 " encountered RPCSEC_GSS session"
1340 " expired against NFSv4 server %s.\n",
1341 s);
1342}
1343
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001344static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
Trond Myklebuste598d842008-12-23 15:21:42 -05001345{
1346 switch (error) {
1347 case -NFS4ERR_CB_PATH_DOWN:
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001348 nfs_handle_cb_pathdown(clp);
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001349 return 0;
Trond Myklebustc8b7ae3d2009-12-03 15:53:21 -05001350 case -NFS4ERR_NO_GRACE:
1351 nfs4_state_end_reclaim_reboot(clp);
1352 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001353 case -NFS4ERR_STALE_CLIENTID:
1354 case -NFS4ERR_LEASE_MOVED:
1355 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001356 nfs4_state_clear_reclaim_reboot(clp);
Trond Myklebuste598d842008-12-23 15:21:42 -05001357 nfs4_state_start_reclaim_reboot(clp);
1358 break;
1359 case -NFS4ERR_EXPIRED:
1360 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1361 nfs4_state_start_reclaim_nograce(clp);
Andy Adamson8ba9bf82009-12-04 15:55:34 -05001362 break;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001363 case -NFS4ERR_BADSESSION:
1364 case -NFS4ERR_BADSLOT:
1365 case -NFS4ERR_BAD_HIGH_SLOT:
1366 case -NFS4ERR_DEADSESSION:
1367 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1368 case -NFS4ERR_SEQ_FALSE_RETRY:
1369 case -NFS4ERR_SEQ_MISORDERED:
Andy Adamson6df08182009-12-04 15:55:05 -05001370 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
Andy Adamson0b9e2d42009-12-04 16:02:14 -05001371 /* Zero session reset errors */
1372 return 0;
Trond Myklebust168667c2010-10-19 19:47:49 -04001373 case -EKEYEXPIRED:
1374 /* Nothing we can do */
1375 nfs4_warn_keyexpired(clp->cl_hostname);
1376 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001377 }
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001378 return error;
Trond Myklebuste598d842008-12-23 15:21:42 -05001379}
1380
Trond Myklebust02860012008-12-23 15:21:40 -05001381static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382{
Chuck Lever24d292b2010-12-24 01:32:43 +00001383 struct nfs4_state_owner *sp;
1384 struct nfs_server *server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001385 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 int status = 0;
1387
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001388restart:
Chuck Lever24d292b2010-12-24 01:32:43 +00001389 rcu_read_lock();
1390 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1391 spin_lock(&clp->cl_lock);
1392 for (pos = rb_first(&server->state_owners);
1393 pos != NULL;
1394 pos = rb_next(pos)) {
1395 sp = rb_entry(pos,
1396 struct nfs4_state_owner, so_server_node);
1397 if (!test_and_clear_bit(ops->owner_flag_bit,
1398 &sp->so_flags))
1399 continue;
1400 atomic_inc(&sp->so_count);
1401 spin_unlock(&clp->cl_lock);
1402 rcu_read_unlock();
1403
1404 status = nfs4_reclaim_open_state(sp, ops);
1405 if (status < 0) {
1406 set_bit(ops->owner_flag_bit, &sp->so_flags);
1407 nfs4_put_state_owner(sp);
1408 return nfs4_recovery_handle_error(clp, status);
1409 }
1410
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001411 nfs4_put_state_owner(sp);
Chuck Lever24d292b2010-12-24 01:32:43 +00001412 goto restart;
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001413 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001414 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001415 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001416 rcu_read_unlock();
Trond Myklebust02860012008-12-23 15:21:40 -05001417 return status;
1418}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
Trond Myklebust02860012008-12-23 15:21:40 -05001420static int nfs4_check_lease(struct nfs_client *clp)
1421{
1422 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001423 const struct nfs4_state_maintenance_ops *ops =
1424 clp->cl_mvops->state_renewal_ops;
Trond Myklebust02860012008-12-23 15:21:40 -05001425 int status = -NFS4ERR_EXPIRED;
1426
Trond Myklebust0f605b52008-12-23 15:21:42 -05001427 /* Is the client already known to have an expired lease? */
1428 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1429 return 0;
Andy Adamsona7b72102009-04-01 09:22:46 -04001430 spin_lock(&clp->cl_lock);
1431 cred = ops->get_state_renewal_cred_locked(clp);
1432 spin_unlock(&clp->cl_lock);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001433 if (cred == NULL) {
1434 cred = nfs4_get_setclientid_cred(clp);
1435 if (cred == NULL)
1436 goto out;
Trond Myklebust02860012008-12-23 15:21:40 -05001437 }
Benny Halevy8e69514f2009-04-01 09:22:45 -04001438 status = ops->renew_lease(clp, cred);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001439 put_rpccred(cred);
1440out:
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001441 return nfs4_recovery_handle_error(clp, status);
Trond Myklebust02860012008-12-23 15:21:40 -05001442}
1443
1444static int nfs4_reclaim_lease(struct nfs_client *clp)
1445{
1446 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001447 const struct nfs4_state_recovery_ops *ops =
1448 clp->cl_mvops->reboot_recovery_ops;
Trond Myklebust02860012008-12-23 15:21:40 -05001449 int status = -ENOENT;
1450
Andy Adamson90a16612009-04-01 09:22:48 -04001451 cred = ops->get_clid_cred(clp);
Trond Myklebust02860012008-12-23 15:21:40 -05001452 if (cred != NULL) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001453 status = ops->establish_clid(clp, cred);
Trond Myklebust02860012008-12-23 15:21:40 -05001454 put_rpccred(cred);
1455 /* Handle case where the user hasn't set up machine creds */
1456 if (status == -EACCES && cred == clp->cl_machine_cred) {
1457 nfs4_clear_machine_cred(clp);
1458 status = -EAGAIN;
1459 }
Benny Halevyc2e713d2009-04-01 09:21:51 -04001460 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1461 status = -EPROTONOSUPPORT;
Trond Myklebust02860012008-12-23 15:21:40 -05001462 }
1463 return status;
1464}
1465
Andy Adamson76db6d92009-04-01 09:22:38 -04001466#ifdef CONFIG_NFS_V4_1
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001467void nfs4_schedule_session_recovery(struct nfs4_session *session)
1468{
1469 nfs4_schedule_lease_recovery(session->clp);
1470}
Andy Adamsoncbdabc7f2011-03-01 01:34:20 +00001471EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001472
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001473void nfs41_handle_recall_slot(struct nfs_client *clp)
1474{
1475 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001476 nfs4_schedule_state_manager(clp);
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001477}
1478
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001479static void nfs4_reset_all_state(struct nfs_client *clp)
1480{
1481 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1482 clp->cl_boot_time = CURRENT_TIME;
1483 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001484 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001485 }
1486}
1487
1488static void nfs41_handle_server_reboot(struct nfs_client *clp)
1489{
1490 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1491 nfs4_state_start_reclaim_reboot(clp);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001492 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001493 }
1494}
1495
1496static void nfs41_handle_state_revoked(struct nfs_client *clp)
1497{
1498 /* Temporary */
1499 nfs4_reset_all_state(clp);
1500}
1501
1502static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1503{
1504 /* This will need to handle layouts too */
1505 nfs_expire_all_delegations(clp);
1506}
1507
1508static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1509{
1510 nfs_expire_all_delegations(clp);
1511 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001512 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001513}
1514
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001515void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1516{
1517 if (!flags)
1518 return;
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001519 else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1520 nfs41_handle_server_reboot(clp);
1521 else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001522 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1523 SEQ4_STATUS_ADMIN_STATE_REVOKED |
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001524 SEQ4_STATUS_LEASE_MOVED))
1525 nfs41_handle_state_revoked(clp);
1526 else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1527 nfs41_handle_recallable_state_revoked(clp);
1528 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001529 SEQ4_STATUS_BACKCHANNEL_FAULT |
1530 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
Trond Myklebust0f79fd62010-03-02 13:06:21 -05001531 nfs41_handle_cb_path_down(clp);
Alexandros Batsakis0629e372009-12-05 13:46:14 -05001532}
1533
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001534static int nfs4_reset_session(struct nfs_client *clp)
1535{
1536 int status;
1537
Trond Myklebust38045412009-12-15 17:36:57 -05001538 nfs4_begin_drain_session(clp);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001539 status = nfs4_proc_destroy_session(clp->cl_session);
1540 if (status && status != -NFS4ERR_BADSESSION &&
1541 status != -NFS4ERR_DEADSESSION) {
Ricardo Labiagaf4558482009-12-07 09:16:09 -05001542 status = nfs4_recovery_handle_error(clp, status);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001543 goto out;
1544 }
1545
1546 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
Trond Myklebustf26468f2009-12-05 19:32:11 -05001547 status = nfs4_proc_create_session(clp);
Andy Adamson41f54a52010-01-21 14:54:13 -05001548 if (status) {
Ricardo Labiagaf4558482009-12-07 09:16:09 -05001549 status = nfs4_recovery_handle_error(clp, status);
Andy Adamson41f54a52010-01-21 14:54:13 -05001550 goto out;
1551 }
1552 /* create_session negotiated new slot table */
1553 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -05001554
Andy Adamson41f54a52010-01-21 14:54:13 -05001555 /* Let the state manager reestablish state */
1556 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001557 nfs41_setup_state_renewal(clp);
Andy Adamson41f54a52010-01-21 14:54:13 -05001558out:
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001559 return status;
1560}
Andy Adamson76db6d92009-04-01 09:22:38 -04001561
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001562static int nfs4_recall_slot(struct nfs_client *clp)
1563{
1564 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1565 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1566 struct nfs4_slot *new, *old;
1567 int i;
1568
1569 nfs4_begin_drain_session(clp);
1570 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
Trond Myklebust8535b2b2010-05-13 12:51:01 -04001571 GFP_NOFS);
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001572 if (!new)
1573 return -ENOMEM;
1574
1575 spin_lock(&fc_tbl->slot_tbl_lock);
1576 for (i = 0; i < fc_tbl->target_max_slots; i++)
1577 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1578 old = fc_tbl->slots;
1579 fc_tbl->slots = new;
1580 fc_tbl->max_slots = fc_tbl->target_max_slots;
1581 fc_tbl->target_max_slots = 0;
1582 fc_attrs->max_reqs = fc_tbl->max_slots;
1583 spin_unlock(&fc_tbl->slot_tbl_lock);
1584
1585 kfree(old);
1586 nfs4_end_drain_session(clp);
1587 return 0;
1588}
1589
Andy Adamson76db6d92009-04-01 09:22:38 -04001590#else /* CONFIG_NFS_V4_1 */
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001591static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001592static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001593static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
Andy Adamson76db6d92009-04-01 09:22:38 -04001594#endif /* CONFIG_NFS_V4_1 */
1595
Andy Adamson78722e92009-06-16 14:43:15 -04001596/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1597 * on EXCHANGE_ID for v4.1
1598 */
1599static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1600{
Trond Myklebustfd954ae2011-04-24 14:28:18 -04001601 switch (status) {
1602 case -NFS4ERR_CLID_INUSE:
1603 case -NFS4ERR_STALE_CLIENTID:
1604 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1605 break;
1606 case -NFS4ERR_DELAY:
Trond Myklebust1bd714f2011-04-24 14:29:33 -04001607 case -ETIMEDOUT:
Trond Myklebustfd954ae2011-04-24 14:28:18 -04001608 case -EAGAIN:
1609 ssleep(1);
1610 break;
Andy Adamson78722e92009-06-16 14:43:15 -04001611
Trond Myklebustfd954ae2011-04-24 14:28:18 -04001612 case -EKEYEXPIRED:
1613 nfs4_warn_keyexpired(clp->cl_hostname);
1614 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1615 * in nfs4_exchange_id */
1616 default:
1617 return;
Andy Adamson78722e92009-06-16 14:43:15 -04001618 }
1619 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1620}
1621
Trond Myklebuste005e802008-12-23 15:21:48 -05001622static void nfs4_state_manager(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05001623{
Trond Myklebust02860012008-12-23 15:21:40 -05001624 int status = 0;
1625
Trond Myklebust02860012008-12-23 15:21:40 -05001626 /* Ensure exclusive access to NFSv4 state */
Trond Myklebust47c21992011-04-15 17:34:18 -04001627 do {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001628 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1629 /* We're going to have to re-establish a clientid */
1630 status = nfs4_reclaim_lease(clp);
1631 if (status) {
Andy Adamson78722e92009-06-16 14:43:15 -04001632 nfs4_set_lease_expired(clp, status);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001633 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1634 &clp->cl_state))
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001635 continue;
Andy Adamson76db6d92009-04-01 09:22:38 -04001636 if (clp->cl_cons_state ==
1637 NFS_CS_SESSION_INITING)
1638 nfs_mark_client_ready(clp, status);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001639 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 }
Trond Myklebuste598d842008-12-23 15:21:42 -05001641 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Ricardo Labiaga7cab89b2009-12-08 14:35:28 -05001642 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
Andy Adamson974cec82010-10-20 00:18:02 -04001643 pnfs_destroy_all_layouts(clp);
Trond Myklebuste598d842008-12-23 15:21:42 -05001644 }
1645
1646 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1647 status = nfs4_check_lease(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001648 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
Trond Myklebuste598d842008-12-23 15:21:42 -05001649 continue;
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001650 if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1651 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001653
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001654 /* Initialize or reset the session */
Andy Adamson6df08182009-12-04 15:55:05 -05001655 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
Trond Myklebust7111dc72009-08-24 19:21:29 -04001656 && nfs4_has_session(clp)) {
Andy Adamson4d643d12009-12-04 15:52:24 -05001657 status = nfs4_reset_session(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001658 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1659 continue;
1660 if (status < 0)
Andy Adamson76db6d92009-04-01 09:22:38 -04001661 goto out_error;
Andy Adamson76db6d92009-04-01 09:22:38 -04001662 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001663
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001664 /* First recover reboot state... */
Trond Myklebuste345e882009-12-03 15:52:41 -05001665 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001666 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001667 clp->cl_mvops->reboot_recovery_ops);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001668 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
Andy Adamson6df08182009-12-04 15:55:05 -05001669 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001670 continue;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001671 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001672 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1673 continue;
1674 if (status < 0)
1675 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001676 }
1677
1678 /* Now recover expired state... */
1679 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
Andy Adamson591d71c2009-04-01 09:22:47 -04001680 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001681 clp->cl_mvops->nograce_recovery_ops);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001682 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
Andy Adamson6df08182009-12-04 15:55:05 -05001683 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
Trond Myklebustb6d408b2009-12-03 15:53:22 -05001684 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1685 continue;
1686 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001687 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001688 }
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001689
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001690 nfs4_end_drain_session(clp);
Trond Myklebust707fb4b2008-12-23 15:21:47 -05001691 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1692 nfs_client_return_marked_delegations(clp);
1693 continue;
1694 }
Andy Adamsonb9efa1b2010-01-20 16:06:27 -05001695 /* Recall session slots */
1696 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1697 && nfs4_has_session(clp)) {
1698 status = nfs4_recall_slot(clp);
1699 if (status < 0)
1700 goto out_error;
1701 continue;
1702 }
1703
Trond Myklebuste005e802008-12-23 15:21:48 -05001704
1705 nfs4_clear_state_manager_bit(clp);
Trond Myklebustf3c76492008-12-23 15:21:48 -05001706 /* Did we race with an attempt to give us more work? */
1707 if (clp->cl_state == 0)
1708 break;
1709 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1710 break;
Trond Myklebust47c21992011-04-15 17:34:18 -04001711 } while (atomic_read(&clp->cl_count) > 1);
Trond Myklebuste005e802008-12-23 15:21:48 -05001712 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713out_error:
Trond Myklebuste005e802008-12-23 15:21:48 -05001714 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
Chuck Lever5d8515c2007-12-10 14:57:16 -05001715 " with error %d\n", clp->cl_hostname, -status);
Alexandros Batsakis5601a002009-12-14 21:27:58 -08001716 nfs4_end_drain_session(clp);
Trond Myklebuste005e802008-12-23 15:21:48 -05001717 nfs4_clear_state_manager_bit(clp);
1718}
1719
1720static int nfs4_run_state_manager(void *ptr)
1721{
1722 struct nfs_client *clp = ptr;
1723
1724 allow_signal(SIGKILL);
1725 nfs4_state_manager(clp);
1726 nfs_put_client(clp);
1727 module_put_and_exit(0);
1728 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729}
1730
1731/*
1732 * Local variables:
1733 * c-basic-offset: 8
1734 * End:
1735 */