blob: 4b538bb194f8896731cc8b13a335d5813bebc56a [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>
Trond Myklebust5043e902006-01-03 09:55:23 +010045#include <linux/kthread.h>
46#include <linux/module.h>
Trond Myklebust9f958ab2007-07-02 13:58:33 -040047#include <linux/random.h>
Randy Dunlap8c7597f2010-10-22 16:18:52 -070048#include <linux/ratelimit.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/workqueue.h>
50#include <linux/bitops.h>
Chuck Lever0aaaf5c2011-12-06 16:13:48 -050051#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Chuck Lever05f4c352012-09-14 17:24:32 -040053#include <linux/sunrpc/clnt.h>
54
Trond Myklebust4ce79712005-06-22 17:16:21 +000055#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include "callback.h"
57#include "delegation.h"
David Howells24c8dbb2006-08-22 20:06:10 -040058#include "internal.h"
Anna Schumaker40c64c22015-04-15 13:00:05 -040059#include "nfs4idmap.h"
Trond Myklebust76e697b2012-11-26 14:20:49 -050060#include "nfs4session.h"
Andy Adamson974cec82010-10-20 00:18:02 -040061#include "pnfs.h"
Stanislav Kinsburskybbe0a3a2012-08-20 18:00:36 +040062#include "netns.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Chuck Levere3c0fb72012-05-21 22:45:24 -040064#define NFSDBG_FACILITY NFSDBG_STATE
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#define OPENOWNER_POOL_SIZE 8
67
Trond Myklebust93b717f2016-05-16 17:42:43 -040068const nfs4_stateid zero_stateid = {
Linus Torvaldse0714ec2016-05-27 17:20:27 -070069 { .data = { 0 } },
Trond Myklebust93b717f2016-05-16 17:42:43 -040070 .type = NFS4_SPECIAL_STATEID_TYPE,
71};
Chuck Lever05f4c352012-09-14 17:24:32 -040072static DEFINE_MUTEX(nfs_clid_init_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Andy Adamson591d71c2009-04-01 09:22:47 -040074int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
Trond Myklebustfd954ae2011-04-24 14:28:18 -040076 struct nfs4_setclientid_res clid = {
77 .clientid = clp->cl_clientid,
78 .confirm = clp->cl_confirm,
79 };
Chuck Leverf738f512009-03-18 20:48:06 -040080 unsigned short port;
81 int status;
Stanislav Kinsburskybbe0a3a2012-08-20 18:00:36 +040082 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
Chuck Leverf738f512009-03-18 20:48:06 -040083
Trond Myklebustfd954ae2011-04-24 14:28:18 -040084 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
85 goto do_confirm;
Stanislav Kinsburskybbe0a3a2012-08-20 18:00:36 +040086 port = nn->nfs_callback_tcpport;
Chuck Leverf738f512009-03-18 20:48:06 -040087 if (clp->cl_addr.ss_family == AF_INET6)
Stanislav Kinsbursky29dcc162012-08-20 18:00:41 +040088 port = nn->nfs_callback_tcpport6;
Chuck Leverf738f512009-03-18 20:48:06 -040089
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040090 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
91 if (status != 0)
92 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -040093 clp->cl_clientid = clid.clientid;
94 clp->cl_confirm = clid.confirm;
95 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
96do_confirm:
Trond Myklebustbb8b27e2010-04-16 16:43:06 -040097 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
98 if (status != 0)
99 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400100 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Trond Myklebustbb8b27e2010-04-16 16:43:06 -0400101 nfs4_schedule_state_renewal(clp);
102out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return status;
104}
105
Chuck Lever05f4c352012-09-14 17:24:32 -0400106/**
107 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
108 *
109 * @clp: nfs_client under test
110 * @result: OUT: found nfs_client, or clp
111 * @cred: credential to use for trunking test
112 *
113 * Returns zero, a negative errno, or a negative NFS4ERR status.
114 * If zero is returned, an nfs_client pointer is planted in
115 * "result".
116 *
117 * Note: The returned client may not yet be marked ready.
118 */
119int nfs40_discover_server_trunking(struct nfs_client *clp,
120 struct nfs_client **result,
121 struct rpc_cred *cred)
122{
123 struct nfs4_setclientid_res clid = {
124 .clientid = clp->cl_clientid,
125 .confirm = clp->cl_confirm,
126 };
Trond Myklebust9f623872012-10-01 16:17:31 -0700127 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
Chuck Lever05f4c352012-09-14 17:24:32 -0400128 unsigned short port;
129 int status;
130
Trond Myklebust9f623872012-10-01 16:17:31 -0700131 port = nn->nfs_callback_tcpport;
Chuck Lever05f4c352012-09-14 17:24:32 -0400132 if (clp->cl_addr.ss_family == AF_INET6)
Trond Myklebust9f623872012-10-01 16:17:31 -0700133 port = nn->nfs_callback_tcpport6;
Chuck Lever05f4c352012-09-14 17:24:32 -0400134
135 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
136 if (status != 0)
137 goto out;
138 clp->cl_clientid = clid.clientid;
139 clp->cl_confirm = clid.confirm;
140
141 status = nfs40_walk_client_list(clp, result, cred);
Trond Myklebust202c3122013-01-18 22:56:23 -0500142 if (status == 0) {
Chuck Lever05f4c352012-09-14 17:24:32 -0400143 /* Sustain the lease, even if it's empty. If the clientid4
144 * goes stale it's of no use for trunking discovery. */
145 nfs4_schedule_state_renewal(*result);
Chuck Lever05f4c352012-09-14 17:24:32 -0400146 }
Chuck Lever05f4c352012-09-14 17:24:32 -0400147out:
148 return status;
149}
150
Andy Adamsona7b72102009-04-01 09:22:46 -0400151struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400152{
153 struct rpc_cred *cred = NULL;
154
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400155 if (clp->cl_machine_cred != NULL)
156 cred = get_rpccred(clp->cl_machine_cred);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400157 return cred;
158}
159
Chuck Leverd688f7b2013-07-24 12:28:28 -0400160static void nfs4_root_machine_cred(struct nfs_client *clp)
161{
162 struct rpc_cred *cred, *new;
163
164 new = rpc_lookup_machine_cred(NULL);
165 spin_lock(&clp->cl_lock);
166 cred = clp->cl_machine_cred;
167 clp->cl_machine_cred = new;
168 spin_unlock(&clp->cl_lock);
169 if (cred != NULL)
170 put_rpccred(cred);
171}
172
Chuck Lever24d292b2010-12-24 01:32:43 +0000173static struct rpc_cred *
174nfs4_get_renew_cred_server_locked(struct nfs_server *server)
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100175{
Chuck Lever24d292b2010-12-24 01:32:43 +0000176 struct rpc_cred *cred = NULL;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100177 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400178 struct rb_node *pos;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100179
Chuck Lever24d292b2010-12-24 01:32:43 +0000180 for (pos = rb_first(&server->state_owners);
181 pos != NULL;
182 pos = rb_next(pos)) {
183 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100184 if (list_empty(&sp->so_states))
185 continue;
186 cred = get_rpccred(sp->so_cred);
187 break;
188 }
189 return cred;
190}
191
Chuck Lever24d292b2010-12-24 01:32:43 +0000192/**
193 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
194 * @clp: client state handle
195 *
196 * Returns an rpc_cred with reference count bumped, or NULL.
197 * Caller must hold clp->cl_lock.
198 */
199struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
200{
201 struct rpc_cred *cred = NULL;
202 struct nfs_server *server;
203
Sachin Prabhue49a29b2012-03-16 19:25:52 +0000204 /* Use machine credentials if available */
205 cred = nfs4_get_machine_cred_locked(clp);
206 if (cred != NULL)
207 goto out;
208
Chuck Lever24d292b2010-12-24 01:32:43 +0000209 rcu_read_lock();
210 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
211 cred = nfs4_get_renew_cred_server_locked(server);
212 if (cred != NULL)
213 break;
214 }
215 rcu_read_unlock();
Sachin Prabhue49a29b2012-03-16 19:25:52 +0000216
217out:
Chuck Lever24d292b2010-12-24 01:32:43 +0000218 return cred;
219}
220
Andy Adamson62f288a2013-06-19 16:39:44 -0400221static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500222{
Andy Adamson774d5f12013-05-20 14:13:50 -0400223 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
Trond Myklebust961a8282012-01-17 22:57:37 -0500224 spin_lock(&tbl->slot_tbl_lock);
Trond Myklebustb75ad4c2012-11-29 17:27:47 -0500225 nfs41_wake_slot_table(tbl);
Trond Myklebust961a8282012-01-17 22:57:37 -0500226 spin_unlock(&tbl->slot_tbl_lock);
Alexandros Batsakis689cf5c2009-12-14 21:27:56 -0800227 }
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500228}
229
Andy Adamson62f288a2013-06-19 16:39:44 -0400230static void nfs4_end_drain_session(struct nfs_client *clp)
231{
232 struct nfs4_session *ses = clp->cl_session;
233
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400234 if (clp->cl_slot_tbl) {
235 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
236 return;
237 }
238
Andy Adamson62f288a2013-06-19 16:39:44 -0400239 if (ses != NULL) {
240 nfs4_end_drain_slot_table(&ses->bc_slot_table);
241 nfs4_end_drain_slot_table(&ses->fc_slot_table);
242 }
243}
244
Andy Adamson774d5f12013-05-20 14:13:50 -0400245static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500246{
Andy Adamson774d5f12013-05-20 14:13:50 -0400247 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500248 spin_lock(&tbl->slot_tbl_lock);
Andy Adamsonb6bf6e72012-02-17 13:05:23 -0500249 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
Wolfram Sang16735d02013-11-14 14:32:02 -0800250 reinit_completion(&tbl->complete);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500251 spin_unlock(&tbl->slot_tbl_lock);
Andy Adamson42acd022011-01-06 02:04:34 +0000252 return wait_for_completion_interruptible(&tbl->complete);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500253 }
254 spin_unlock(&tbl->slot_tbl_lock);
255 return 0;
256}
257
Andy Adamson42acd022011-01-06 02:04:34 +0000258static int nfs4_begin_drain_session(struct nfs_client *clp)
259{
260 struct nfs4_session *ses = clp->cl_session;
261 int ret = 0;
262
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400263 if (clp->cl_slot_tbl)
264 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
265
Andy Adamson42acd022011-01-06 02:04:34 +0000266 /* back channel */
Andy Adamson774d5f12013-05-20 14:13:50 -0400267 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
Andy Adamson42acd022011-01-06 02:04:34 +0000268 if (ret)
269 return ret;
270 /* fore channel */
Andy Adamson774d5f12013-05-20 14:13:50 -0400271 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
Andy Adamson42acd022011-01-06 02:04:34 +0000272}
273
Chuck Leverc9fdeb22013-10-17 14:13:02 -0400274#if defined(CONFIG_NFS_V4_1)
275
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400276static int nfs41_setup_state_renewal(struct nfs_client *clp)
277{
278 int status;
279 struct nfs_fsinfo fsinfo;
Trond Myklebustfb10fb62016-08-05 19:13:08 -0400280 unsigned long now;
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400281
282 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
283 nfs4_schedule_state_renewal(clp);
284 return 0;
285 }
286
Trond Myklebustfb10fb62016-08-05 19:13:08 -0400287 now = jiffies;
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400288 status = nfs4_proc_get_lease_time(clp, &fsinfo);
289 if (status == 0) {
Trond Myklebustfb10fb62016-08-05 19:13:08 -0400290 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400291 nfs4_schedule_state_renewal(clp);
292 }
293
294 return status;
295}
296
Trond Myklebustbda197f2012-06-05 10:22:14 -0400297static void nfs41_finish_session_reset(struct nfs_client *clp)
298{
299 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
300 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
301 /* create_session negotiated new slot table */
Trond Myklebustbda197f2012-06-05 10:22:14 -0400302 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
303 nfs41_setup_state_renewal(clp);
304}
305
Andy Adamson4d643d12009-12-04 15:52:24 -0500306int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
307{
308 int status;
309
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400310 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
311 goto do_confirm;
Andy Adamson4d643d12009-12-04 15:52:24 -0500312 status = nfs4_proc_exchange_id(clp, cred);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500313 if (status != 0)
314 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400315 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
316do_confirm:
Trond Myklebust848f5bd2012-05-25 17:51:23 -0400317 status = nfs4_proc_create_session(clp, cred);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500318 if (status != 0)
319 goto out;
Trond Myklebustbda197f2012-06-05 10:22:14 -0400320 nfs41_finish_session_reset(clp);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500321 nfs_mark_client_ready(clp, NFS_CS_READY);
322out:
Andy Adamson4d643d12009-12-04 15:52:24 -0500323 return status;
324}
325
Chuck Lever05f4c352012-09-14 17:24:32 -0400326/**
327 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
328 *
329 * @clp: nfs_client under test
330 * @result: OUT: found nfs_client, or clp
331 * @cred: credential to use for trunking test
332 *
333 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
334 * If NFS4_OK is returned, an nfs_client pointer is planted in
335 * "result".
336 *
337 * Note: The returned client may not yet be marked ready.
338 */
339int nfs41_discover_server_trunking(struct nfs_client *clp,
340 struct nfs_client **result,
341 struct rpc_cred *cred)
342{
343 int status;
344
345 status = nfs4_proc_exchange_id(clp, cred);
346 if (status != NFS4_OK)
347 return status;
348
Trond Myklebust48d66b92015-03-03 20:28:59 -0500349 status = nfs41_walk_client_list(clp, result, cred);
350 if (status < 0)
351 return status;
352 if (clp != *result)
353 return 0;
354
Trond Myklebuste11259f2015-03-03 20:35:31 -0500355 /* Purge state if the client id was established in a prior instance */
356 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
357 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
358 else
359 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Trond Myklebust48d66b92015-03-03 20:28:59 -0500360 nfs4_schedule_state_manager(clp);
361 status = nfs_wait_client_init_complete(clp);
362 if (status < 0)
363 nfs_put_client(clp);
364 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400365}
366
Andy Adamsonb4b82602009-04-01 09:22:49 -0400367#endif /* CONFIG_NFS_V4_1 */
368
Chuck Lever24d292b2010-12-24 01:32:43 +0000369/**
Chuck Lever73d8bde2013-07-24 12:28:37 -0400370 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
Chuck Lever24d292b2010-12-24 01:32:43 +0000371 * @clp: client state handle
372 *
373 * Returns an rpc_cred with reference count bumped, or NULL.
374 */
Chuck Lever73d8bde2013-07-24 12:28:37 -0400375struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
Chuck Lever24d292b2010-12-24 01:32:43 +0000376{
Chuck Lever24d292b2010-12-24 01:32:43 +0000377 struct rpc_cred *cred;
378
379 spin_lock(&clp->cl_lock);
380 cred = nfs4_get_machine_cred_locked(clp);
381 spin_unlock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000382 return cred;
383}
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385static struct nfs4_state_owner *
Chuck Lever24d292b2010-12-24 01:32:43 +0000386nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Chuck Lever24d292b2010-12-24 01:32:43 +0000388 struct rb_node **p = &server->state_owners.rb_node,
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400389 *parent = NULL;
Chuck Lever414adf12011-12-06 16:13:39 -0500390 struct nfs4_state_owner *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400392 while (*p != NULL) {
393 parent = *p;
Chuck Lever24d292b2010-12-24 01:32:43 +0000394 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400395
396 if (cred < sp->so_cred)
397 p = &parent->rb_left;
398 else if (cred > sp->so_cred)
399 p = &parent->rb_right;
400 else {
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500401 if (!list_empty(&sp->so_lru))
402 list_del_init(&sp->so_lru);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400403 atomic_inc(&sp->so_count);
Chuck Lever414adf12011-12-06 16:13:39 -0500404 return sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400405 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 }
Chuck Lever414adf12011-12-06 16:13:39 -0500407 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408}
409
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400410static struct nfs4_state_owner *
Chuck Lever24d292b2010-12-24 01:32:43 +0000411nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400412{
Chuck Lever24d292b2010-12-24 01:32:43 +0000413 struct nfs_server *server = new->so_server;
414 struct rb_node **p = &server->state_owners.rb_node,
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400415 *parent = NULL;
416 struct nfs4_state_owner *sp;
Trond Myklebust9157c312012-01-17 22:04:24 -0500417 int err;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400418
419 while (*p != NULL) {
420 parent = *p;
Chuck Lever24d292b2010-12-24 01:32:43 +0000421 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400422
423 if (new->so_cred < sp->so_cred)
424 p = &parent->rb_left;
425 else if (new->so_cred > sp->so_cred)
426 p = &parent->rb_right;
427 else {
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500428 if (!list_empty(&sp->so_lru))
429 list_del_init(&sp->so_lru);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400430 atomic_inc(&sp->so_count);
431 return sp;
432 }
433 }
Trond Myklebust48c22eb2012-01-17 22:04:25 -0500434 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
Trond Myklebust9157c312012-01-17 22:04:24 -0500435 if (err)
436 return ERR_PTR(err);
Chuck Lever24d292b2010-12-24 01:32:43 +0000437 rb_link_node(&new->so_server_node, parent, p);
438 rb_insert_color(&new->so_server_node, &server->state_owners);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400439 return new;
440}
441
442static void
Chuck Lever24d292b2010-12-24 01:32:43 +0000443nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400444{
Chuck Lever24d292b2010-12-24 01:32:43 +0000445 struct nfs_server *server = sp->so_server;
446
447 if (!RB_EMPTY_NODE(&sp->so_server_node))
448 rb_erase(&sp->so_server_node, &server->state_owners);
Trond Myklebust48c22eb2012-01-17 22:04:25 -0500449 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400450}
451
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500452static void
453nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
454{
Trond Myklebust95b72eb2012-04-20 19:24:51 -0400455 sc->create_time = ktime_get();
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500456 sc->flags = 0;
457 sc->counter = 0;
458 spin_lock_init(&sc->lock);
459 INIT_LIST_HEAD(&sc->list);
460 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
461}
462
463static void
464nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
465{
466 rpc_destroy_wait_queue(&sc->wait);
467}
468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469/*
470 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
471 * create a new state_owner.
472 *
473 */
474static struct nfs4_state_owner *
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500475nfs4_alloc_state_owner(struct nfs_server *server,
476 struct rpc_cred *cred,
477 gfp_t gfp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478{
479 struct nfs4_state_owner *sp;
480
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500481 sp = kzalloc(sizeof(*sp), gfp_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (!sp)
483 return NULL;
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500484 sp->so_server = server;
485 sp->so_cred = get_rpccred(cred);
Trond Myklebustec073422005-10-20 14:22:47 -0700486 spin_lock_init(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 INIT_LIST_HEAD(&sp->so_states);
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500488 nfs4_init_seqid_counter(&sp->so_seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 atomic_set(&sp->so_count, 1);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500490 INIT_LIST_HEAD(&sp->so_lru);
Trond Myklebustc137afa2013-02-07 14:41:11 -0500491 seqcount_init(&sp->so_reclaim_seqcount);
Trond Myklebust65b62a22013-02-07 10:54:07 -0500492 mutex_init(&sp->so_delegreturn_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 return sp;
494}
495
Adrian Bunk1d2e88e2008-05-02 13:42:45 -0700496static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497nfs4_drop_state_owner(struct nfs4_state_owner *sp)
498{
Trond Myklebustc77365c2012-04-21 12:31:05 -0400499 struct rb_node *rb_node = &sp->so_server_node;
500
501 if (!RB_EMPTY_NODE(rb_node)) {
Chuck Lever24d292b2010-12-24 01:32:43 +0000502 struct nfs_server *server = sp->so_server;
503 struct nfs_client *clp = server->nfs_client;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400504
505 spin_lock(&clp->cl_lock);
Trond Myklebustc77365c2012-04-21 12:31:05 -0400506 if (!RB_EMPTY_NODE(rb_node)) {
507 rb_erase(rb_node, &server->state_owners);
508 RB_CLEAR_NODE(rb_node);
509 }
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400510 spin_unlock(&clp->cl_lock);
511 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512}
513
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500514static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
515{
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500516 nfs4_destroy_seqid_counter(&sp->so_seqid);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500517 put_rpccred(sp->so_cred);
518 kfree(sp);
519}
520
521static void nfs4_gc_state_owners(struct nfs_server *server)
522{
523 struct nfs_client *clp = server->nfs_client;
524 struct nfs4_state_owner *sp, *tmp;
525 unsigned long time_min, time_max;
526 LIST_HEAD(doomed);
527
528 spin_lock(&clp->cl_lock);
529 time_max = jiffies;
530 time_min = (long)time_max - (long)clp->cl_lease_time;
531 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
532 /* NB: LRU is sorted so that oldest is at the head */
533 if (time_in_range(sp->so_expires, time_min, time_max))
534 break;
535 list_move(&sp->so_lru, &doomed);
536 nfs4_remove_state_owner_locked(sp);
537 }
538 spin_unlock(&clp->cl_lock);
539
540 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
541 list_del(&sp->so_lru);
542 nfs4_free_state_owner(sp);
543 }
544}
545
Chuck Lever24d292b2010-12-24 01:32:43 +0000546/**
547 * nfs4_get_state_owner - Look up a state owner given a credential
548 * @server: nfs_server to search
549 * @cred: RPC credential to match
550 *
551 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
552 */
553struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500554 struct rpc_cred *cred,
555 gfp_t gfp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
David Howells7539bba2006-08-22 20:06:09 -0400557 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 struct nfs4_state_owner *sp, *new;
559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 spin_lock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000561 sp = nfs4_find_state_owner_locked(server, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 if (sp != NULL)
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500564 goto out;
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500565 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400566 if (new == NULL)
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500567 goto out;
Trond Myklebust9157c312012-01-17 22:04:24 -0500568 do {
569 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
570 break;
571 spin_lock(&clp->cl_lock);
572 sp = nfs4_insert_state_owner_locked(new);
573 spin_unlock(&clp->cl_lock);
574 } while (sp == ERR_PTR(-EAGAIN));
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500575 if (sp != new)
576 nfs4_free_state_owner(new);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500577out:
578 nfs4_gc_state_owners(server);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400579 return sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580}
581
Chuck Lever24d292b2010-12-24 01:32:43 +0000582/**
583 * nfs4_put_state_owner - Release a nfs4_state_owner
584 * @sp: state owner data to release
Trond Myklebust7bf97bc2012-04-21 12:36:19 -0400585 *
586 * Note that we keep released state owners on an LRU
587 * list.
588 * This caches valid state owners so that they can be
589 * reused, to avoid the OPEN_CONFIRM on minor version 0.
590 * It also pins the uniquifier of dropped state owners for
591 * a while, to ensure that those state owner names are
592 * never reused.
Chuck Lever24d292b2010-12-24 01:32:43 +0000593 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594void nfs4_put_state_owner(struct nfs4_state_owner *sp)
595{
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500596 struct nfs_server *server = sp->so_server;
597 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
599 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
600 return;
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500601
Trond Myklebust7bf97bc2012-04-21 12:36:19 -0400602 sp->so_expires = jiffies;
603 list_add_tail(&sp->so_lru, &server->state_owners_lru);
604 spin_unlock(&clp->cl_lock);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500605}
606
607/**
608 * nfs4_purge_state_owners - Release all cached state owners
609 * @server: nfs_server with cached state owners to release
610 *
611 * Called at umount time. Remaining state owners will be on
612 * the LRU with ref count of zero.
613 */
614void nfs4_purge_state_owners(struct nfs_server *server)
615{
616 struct nfs_client *clp = server->nfs_client;
617 struct nfs4_state_owner *sp, *tmp;
618 LIST_HEAD(doomed);
619
620 spin_lock(&clp->cl_lock);
621 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
622 list_move(&sp->so_lru, &doomed);
623 nfs4_remove_state_owner_locked(sp);
624 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 spin_unlock(&clp->cl_lock);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500626
627 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
628 list_del(&sp->so_lru);
629 nfs4_free_state_owner(sp);
630 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631}
632
633static struct nfs4_state *
634nfs4_alloc_open_state(void)
635{
636 struct nfs4_state *state;
637
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400638 state = kzalloc(sizeof(*state), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 if (!state)
640 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 atomic_set(&state->count, 1);
642 INIT_LIST_HEAD(&state->lock_states);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000643 spin_lock_init(&state->state_lock);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400644 seqlock_init(&state->seqlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 return state;
646}
647
Trond Myklebust4cecb762005-11-04 15:32:58 -0500648void
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500649nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500650{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500651 if (state->state == fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500652 return;
653 /* NB! List reordering - see the reclaim code for why. */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500654 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
655 if (fmode & FMODE_WRITE)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500656 list_move(&state->open_states, &state->owner->so_states);
657 else
658 list_move_tail(&state->open_states, &state->owner->so_states);
659 }
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500660 state->state = fmode;
Trond Myklebust4cecb762005-11-04 15:32:58 -0500661}
662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663static struct nfs4_state *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
665{
666 struct nfs_inode *nfsi = NFS_I(inode);
667 struct nfs4_state *state;
668
669 list_for_each_entry(state, &nfsi->open_states, inode_states) {
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400670 if (state->owner != owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 continue;
Trond Myklebust5d422302013-03-14 16:57:48 -0400672 if (!nfs4_valid_open_stateid(state))
673 continue;
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400674 if (atomic_inc_not_zero(&state->count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 return state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 }
677 return NULL;
678}
679
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680static void
681nfs4_free_open_state(struct nfs4_state *state)
682{
683 kfree(state);
684}
685
686struct nfs4_state *
687nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
688{
689 struct nfs4_state *state, *new;
690 struct nfs_inode *nfsi = NFS_I(inode);
691
692 spin_lock(&inode->i_lock);
693 state = __nfs4_find_state_byowner(inode, owner);
694 spin_unlock(&inode->i_lock);
695 if (state)
696 goto out;
697 new = nfs4_alloc_open_state();
Trond Myklebustec073422005-10-20 14:22:47 -0700698 spin_lock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 spin_lock(&inode->i_lock);
700 state = __nfs4_find_state_byowner(inode, owner);
701 if (state == NULL && new != NULL) {
702 state = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 state->owner = owner;
704 atomic_inc(&owner->so_count);
705 list_add(&state->inode_states, &nfsi->open_states);
Dave Chinner0444d762011-03-29 18:08:50 +1100706 ihold(inode);
707 state->inode = inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700709 /* Note: The reclaim code dictates that we add stateless
710 * and read-only stateids to the end of the list */
711 list_add_tail(&state->open_states, &owner->so_states);
712 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 } else {
714 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700715 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 if (new)
717 nfs4_free_open_state(new);
718 }
719out:
720 return state;
721}
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723void nfs4_put_open_state(struct nfs4_state *state)
724{
725 struct inode *inode = state->inode;
726 struct nfs4_state_owner *owner = state->owner;
727
Trond Myklebustec073422005-10-20 14:22:47 -0700728 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 return;
Trond Myklebustec073422005-10-20 14:22:47 -0700730 spin_lock(&inode->i_lock);
Trond Myklebustba6830312007-07-27 10:23:05 -0400731 list_del(&state->inode_states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 list_del(&state->open_states);
Trond Myklebustec073422005-10-20 14:22:47 -0700733 spin_unlock(&inode->i_lock);
734 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 nfs4_free_open_state(state);
737 nfs4_put_state_owner(owner);
738}
739
740/*
Trond Myklebust83c9d412005-10-18 14:20:13 -0700741 * Close the current file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 */
Al Viro643168c2011-06-22 18:20:23 -0400743static void __nfs4_close(struct nfs4_state *state,
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400744 fmode_t fmode, gfp_t gfp_mask, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 struct nfs4_state_owner *owner = state->owner;
Trond Myklebust003707c2007-07-05 18:07:55 -0400747 int call_close = 0;
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500748 fmode_t newstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
750 atomic_inc(&owner->so_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 /* Protect against nfs4_find_state() */
Trond Myklebustec073422005-10-20 14:22:47 -0700752 spin_lock(&owner->so_lock);
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500753 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100754 case FMODE_READ:
755 state->n_rdonly--;
756 break;
757 case FMODE_WRITE:
758 state->n_wronly--;
759 break;
760 case FMODE_READ|FMODE_WRITE:
761 state->n_rdwr--;
762 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400763 newstate = FMODE_READ|FMODE_WRITE;
Trond Myklebuste7616922006-01-03 09:55:13 +0100764 if (state->n_rdwr == 0) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400765 if (state->n_rdonly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100766 newstate &= ~FMODE_READ;
Trond Myklebust003707c2007-07-05 18:07:55 -0400767 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
768 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
769 }
770 if (state->n_wronly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100771 newstate &= ~FMODE_WRITE;
Trond Myklebust003707c2007-07-05 18:07:55 -0400772 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
773 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
774 }
775 if (newstate == 0)
776 clear_bit(NFS_DELEGATED_STATE, &state->flags);
Trond Myklebuste7616922006-01-03 09:55:13 +0100777 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400778 nfs4_state_set_mode_locked(state, newstate);
Trond Myklebustec073422005-10-20 14:22:47 -0700779 spin_unlock(&owner->so_lock);
Trond Myklebust4cecb762005-11-04 15:32:58 -0500780
Trond Myklebust003707c2007-07-05 18:07:55 -0400781 if (!call_close) {
Trond Myklebustb39e6252007-06-11 23:05:07 -0400782 nfs4_put_open_state(state);
783 nfs4_put_state_owner(owner);
Trond Myklebust1f7977c2012-09-20 20:31:51 -0400784 } else
785 nfs4_do_close(state, gfp_mask, wait);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400786}
787
Al Viro643168c2011-06-22 18:20:23 -0400788void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400789{
Al Viro643168c2011-06-22 18:20:23 -0400790 __nfs4_close(state, fmode, GFP_NOFS, 0);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400791}
792
Al Viro643168c2011-06-22 18:20:23 -0400793void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400794{
Al Viro643168c2011-06-22 18:20:23 -0400795 __nfs4_close(state, fmode, GFP_KERNEL, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796}
797
798/*
799 * Search the state->lock_states for an existing lock_owner
800 * that is compatible with current->files
801 */
802static struct nfs4_lock_state *
Jeff Layton8003d3c2014-05-01 06:28:45 -0400803__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804{
805 struct nfs4_lock_state *pos;
806 list_for_each_entry(pos, &state->lock_states, ls_locks) {
Jeff Layton8003d3c2014-05-01 06:28:45 -0400807 if (pos->ls_owner != fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 continue;
809 atomic_inc(&pos->ls_count);
810 return pos;
811 }
812 return NULL;
813}
814
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815/*
816 * Return a compatible lock_state. If no initialized lock_state structure
817 * exists, return an uninitialized one.
818 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 */
Jeff Layton8003d3c2014-05-01 06:28:45 -0400820static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821{
822 struct nfs4_lock_state *lsp;
Chuck Lever24d292b2010-12-24 01:32:43 +0000823 struct nfs_server *server = state->owner->so_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400825 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 if (lsp == NULL)
827 return NULL;
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500828 nfs4_init_seqid_counter(&lsp->ls_seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 atomic_set(&lsp->ls_count, 1);
Trond Myklebustb64aec82009-07-21 16:47:46 -0400830 lsp->ls_state = state;
Jeff Layton8003d3c2014-05-01 06:28:45 -0400831 lsp->ls_owner = fl_owner;
Trond Myklebust48c22eb2012-01-17 22:04:25 -0500832 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
833 if (lsp->ls_seqid.owner_id < 0)
Trond Myklebustd2d7ce22012-01-17 22:04:25 -0500834 goto out_free;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000835 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 return lsp;
Trond Myklebustd2d7ce22012-01-17 22:04:25 -0500837out_free:
838 kfree(lsp);
839 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840}
841
Trond Myklebust5ae67c42012-03-19 16:17:18 -0400842void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400843{
Trond Myklebust48c22eb2012-01-17 22:04:25 -0500844 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500845 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400846 kfree(lsp);
847}
848
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849/*
850 * Return a compatible lock_state. If no initialized lock_state structure
851 * exists, return an uninitialized one.
852 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 */
Jeff Layton8003d3c2014-05-01 06:28:45 -0400854static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000856 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000858 for(;;) {
859 spin_lock(&state->state_lock);
Jeff Layton8003d3c2014-05-01 06:28:45 -0400860 lsp = __nfs4_find_lock_state(state, owner);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000861 if (lsp != NULL)
862 break;
863 if (new != NULL) {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000864 list_add(&new->ls_locks, &state->lock_states);
865 set_bit(LK_STATE_IN_USE, &state->flags);
866 lsp = new;
867 new = NULL;
868 break;
869 }
870 spin_unlock(&state->state_lock);
Jeff Layton8003d3c2014-05-01 06:28:45 -0400871 new = nfs4_alloc_lock_state(state, owner);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000872 if (new == NULL)
873 return NULL;
874 }
875 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400876 if (new != NULL)
Trond Myklebust5ae67c42012-03-19 16:17:18 -0400877 nfs4_free_lock_state(state->owner->so_server, new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 return lsp;
879}
880
881/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000882 * Release reference to lock_state, and free it if we see that
883 * it is no longer in use
884 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700885void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000886{
Trond Myklebustc8b2d0b2013-05-03 16:22:55 -0400887 struct nfs_server *server;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000888 struct nfs4_state *state;
889
890 if (lsp == NULL)
891 return;
892 state = lsp->ls_state;
893 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
894 return;
895 list_del(&lsp->ls_locks);
896 if (list_empty(&state->lock_states))
897 clear_bit(LK_STATE_IN_USE, &state->flags);
898 spin_unlock(&state->state_lock);
Jeff Layton0c0e0d32014-09-08 08:26:01 -0400899 server = state->owner->so_server;
900 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
901 struct nfs_client *clp = server->nfs_client;
902
903 clp->cl_mvops->free_lock_state(server, lsp);
904 } else
Trond Myklebustc8b2d0b2013-05-03 16:22:55 -0400905 nfs4_free_lock_state(server, lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000906}
907
908static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
909{
910 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
911
912 dst->fl_u.nfs4_fl.owner = lsp;
913 atomic_inc(&lsp->ls_count);
914}
915
916static void nfs4_fl_release_lock(struct file_lock *fl)
917{
918 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
919}
920
Alexey Dobriyan6aed6282009-09-21 17:01:11 -0700921static const struct file_lock_operations nfs4_fl_lock_ops = {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000922 .fl_copy_lock = nfs4_fl_copy_lock,
923 .fl_release_private = nfs4_fl_release_lock,
924};
925
926int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
927{
928 struct nfs4_lock_state *lsp;
929
930 if (fl->fl_ops != NULL)
931 return 0;
Jeff Layton8003d3c2014-05-01 06:28:45 -0400932 lsp = nfs4_get_lock_state(state, fl->fl_owner);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000933 if (lsp == NULL)
934 return -ENOMEM;
935 fl->fl_u.nfs4_fl.owner = lsp;
936 fl->fl_ops = &nfs4_fl_lock_ops;
937 return 0;
938}
939
Trond Myklebust5521abf2013-03-16 20:54:34 -0400940static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
941 struct nfs4_state *state,
Trond Myklebust2a369152012-08-13 18:54:45 -0400942 const struct nfs_lockowner *lockowner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000944 struct nfs4_lock_state *lsp;
Trond Myklebust2a369152012-08-13 18:54:45 -0400945 fl_owner_t fl_owner;
Trond Myklebust5521abf2013-03-16 20:54:34 -0400946 int ret = -ENOENT;
Trond Myklebust4fc87962012-03-08 17:42:01 -0500947
Trond Myklebust2a369152012-08-13 18:54:45 -0400948
949 if (lockowner == NULL)
950 goto out;
951
Trond Myklebust4fc87962012-03-08 17:42:01 -0500952 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
953 goto out;
954
Trond Myklebust2a369152012-08-13 18:54:45 -0400955 fl_owner = lockowner->l_owner;
Trond Myklebust4fc87962012-03-08 17:42:01 -0500956 spin_lock(&state->state_lock);
Jeff Layton8003d3c2014-05-01 06:28:45 -0400957 lsp = __nfs4_find_lock_state(state, fl_owner);
NeilBrownef1820f2013-09-04 17:04:49 +1000958 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
959 ret = -EIO;
960 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
Trond Myklebust4fc87962012-03-08 17:42:01 -0500961 nfs4_stateid_copy(dst, &lsp->ls_stateid);
Trond Myklebust5521abf2013-03-16 20:54:34 -0400962 ret = 0;
Trond Myklebust4fc87962012-03-08 17:42:01 -0500963 }
964 spin_unlock(&state->state_lock);
965 nfs4_put_lock_state(lsp);
966out:
967 return ret;
968}
969
Trond Myklebust927864c2014-03-04 13:12:03 -0500970static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
Trond Myklebust4fc87962012-03-08 17:42:01 -0500971{
Trond Myklebust92b40e92013-04-20 01:25:45 -0400972 const nfs4_stateid *src;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400973 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400975 do {
Trond Myklebust92b40e92013-04-20 01:25:45 -0400976 src = &zero_stateid;
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400977 seq = read_seqbegin(&state->seqlock);
Trond Myklebust92b40e92013-04-20 01:25:45 -0400978 if (test_bit(NFS_OPEN_STATE, &state->flags))
979 src = &state->open_stateid;
980 nfs4_stateid_copy(dst, src);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400981 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebust4fc87962012-03-08 17:42:01 -0500982}
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000983
Trond Myklebust4fc87962012-03-08 17:42:01 -0500984/*
985 * Byte-range lock aware utility to initialize the stateid of read/write
986 * requests.
987 */
Trond Myklebustabf4e132016-05-16 17:42:44 -0400988int nfs4_select_rw_stateid(struct nfs4_state *state,
989 fmode_t fmode, const struct nfs_lockowner *lockowner,
990 nfs4_stateid *dst, struct rpc_cred **cred)
Trond Myklebust4fc87962012-03-08 17:42:01 -0500991{
Trond Myklebustabf4e132016-05-16 17:42:44 -0400992 int ret;
993
994 if (cred != NULL)
995 *cred = NULL;
996 ret = nfs4_copy_lock_stateid(dst, state, lockowner);
NeilBrownef1820f2013-09-04 17:04:49 +1000997 if (ret == -EIO)
998 /* A lost lock - don't even consider delegations */
999 goto out;
Andy Adamson146d70c2014-02-18 10:36:05 -05001000 /* returns true if delegation stateid found and copied */
Trond Myklebustabf4e132016-05-16 17:42:44 -04001001 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
Andy Adamson146d70c2014-02-18 10:36:05 -05001002 ret = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001003 goto out;
Andy Adamson146d70c2014-02-18 10:36:05 -05001004 }
Trond Myklebust5521abf2013-03-16 20:54:34 -04001005 if (ret != -ENOENT)
NeilBrownef1820f2013-09-04 17:04:49 +10001006 /* nfs4_copy_delegation_stateid() didn't over-write
1007 * dst, so it still has the lock stateid which we now
1008 * choose to use.
1009 */
Trond Myklebust5521abf2013-03-16 20:54:34 -04001010 goto out;
Trond Myklebust927864c2014-03-04 13:12:03 -05001011 nfs4_copy_open_stateid(dst, state);
1012 ret = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001013out:
Trond Myklebust3b664862013-03-17 15:31:15 -04001014 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1015 dst->seqid = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001016 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017}
1018
Trond Myklebust8535b2b2010-05-13 12:51:01 -04001019struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020{
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001021 struct nfs_seqid *new;
1022
Trond Myklebust8535b2b2010-05-13 12:51:01 -04001023 new = kmalloc(sizeof(*new), gfp_mask);
Trond Myklebustbadc76d2015-01-23 18:48:00 -05001024 if (new == NULL)
1025 return ERR_PTR(-ENOMEM);
1026 new->sequence = counter;
1027 INIT_LIST_HEAD(&new->list);
1028 new->task = NULL;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001029 return new;
1030}
1031
Trond Myklebust72211db2009-12-15 14:47:36 -05001032void nfs_release_seqid(struct nfs_seqid *seqid)
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001033{
Trond Myklebust4601df22012-01-20 18:47:05 -05001034 struct nfs_seqid_counter *sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001035
Trond Myklebusta6796412015-01-23 19:04:44 -05001036 if (seqid == NULL || list_empty(&seqid->list))
Trond Myklebust4601df22012-01-20 18:47:05 -05001037 return;
1038 sequence = seqid->sequence;
1039 spin_lock(&sequence->lock);
1040 list_del_init(&seqid->list);
1041 if (!list_empty(&sequence->list)) {
1042 struct nfs_seqid *next;
1043
1044 next = list_first_entry(&sequence->list,
1045 struct nfs_seqid, list);
1046 rpc_wake_up_queued_task(&sequence->wait, next->task);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001047 }
Trond Myklebust4601df22012-01-20 18:47:05 -05001048 spin_unlock(&sequence->lock);
Trond Myklebust72211db2009-12-15 14:47:36 -05001049}
1050
1051void nfs_free_seqid(struct nfs_seqid *seqid)
1052{
1053 nfs_release_seqid(seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001054 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055}
1056
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001058 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1059 * failed with a seqid incrementing error -
Toralf Förster16a6ddc2013-12-12 19:09:00 +01001060 * see comments nfs4.h:seqid_mutating_error()
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001061 */
Trond Myklebust88d90932007-07-02 14:03:03 -04001062static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063{
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001064 switch (status) {
1065 case 0:
1066 break;
1067 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -04001068 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1069 return;
Trond Myklebust9a3ba432012-03-12 18:01:48 -04001070 pr_warn_ratelimited("NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -08001071 " sequence-id error on an"
1072 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -04001073 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001074 case -NFS4ERR_STALE_CLIENTID:
1075 case -NFS4ERR_STALE_STATEID:
1076 case -NFS4ERR_BAD_STATEID:
1077 case -NFS4ERR_BADXDR:
1078 case -NFS4ERR_RESOURCE:
1079 case -NFS4ERR_NOFILEHANDLE:
1080 /* Non-seqid mutating errors */
1081 return;
1082 };
1083 /*
1084 * Note: no locking needed as we are guaranteed to be first
1085 * on the sequence list
1086 */
1087 seqid->sequence->counter++;
1088}
1089
1090void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1091{
Trond Myklebusta6796412015-01-23 19:04:44 -05001092 struct nfs4_state_owner *sp;
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001093
Trond Myklebusta6796412015-01-23 19:04:44 -05001094 if (seqid == NULL)
1095 return;
1096
1097 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001098 if (status == -NFS4ERR_BAD_SEQID)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 nfs4_drop_state_owner(sp);
Trond Myklebusta6796412015-01-23 19:04:44 -05001100 if (!nfs4_has_session(sp->so_server->nfs_client))
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001101 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001102}
1103
1104/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001105 * Increment the seqid if the LOCK/LOCKU succeeded, or
1106 * failed with a seqid incrementing error -
Toralf Förster16a6ddc2013-12-12 19:09:00 +01001107 * see comments nfs4.h:seqid_mutating_error()
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001108 */
1109void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1110{
Trond Myklebusta6796412015-01-23 19:04:44 -05001111 if (seqid != NULL)
1112 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001113}
1114
1115int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1116{
Trond Myklebusta6796412015-01-23 19:04:44 -05001117 struct nfs_seqid_counter *sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001118 int status = 0;
1119
Trond Myklebusta6796412015-01-23 19:04:44 -05001120 if (seqid == NULL)
1121 goto out;
1122 sequence = seqid->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001123 spin_lock(&sequence->lock);
Trond Myklebust4601df22012-01-20 18:47:05 -05001124 seqid->task = task;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001125 if (list_empty(&seqid->list))
1126 list_add_tail(&seqid->list, &sequence->list);
1127 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1128 goto unlock;
Trond Myklebust5d008372008-02-22 16:34:17 -05001129 rpc_sleep_on(&sequence->wait, task, NULL);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001130 status = -EAGAIN;
1131unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001132 spin_unlock(&sequence->lock);
Trond Myklebusta6796412015-01-23 19:04:44 -05001133out:
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001134 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135}
1136
Trond Myklebuste005e802008-12-23 15:21:48 -05001137static int nfs4_run_state_manager(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138
Trond Myklebuste005e802008-12-23 15:21:48 -05001139static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +01001140{
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001141 smp_mb__before_atomic();
Trond Myklebuste005e802008-12-23 15:21:48 -05001142 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001143 smp_mb__after_atomic();
Trond Myklebuste005e802008-12-23 15:21:48 -05001144 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
Trond Myklebust433fbe42006-01-03 09:55:22 +01001145 rpc_wake_up(&clp->cl_rpcwaitq);
1146}
1147
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148/*
Trond Myklebuste005e802008-12-23 15:21:48 -05001149 * Schedule the nfs_client asynchronous state management routine
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 */
Trond Myklebustb0d3ded2008-12-23 15:21:50 -05001151void nfs4_schedule_state_manager(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152{
Trond Myklebust5043e902006-01-03 09:55:23 +01001153 struct task_struct *task;
Trond Myklebust2446ab62012-03-01 17:00:56 -05001154 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
Trond Myklebuste005e802008-12-23 15:21:48 -05001156 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1157 return;
Trond Myklebust5043e902006-01-03 09:55:23 +01001158 __module_get(THIS_MODULE);
1159 atomic_inc(&clp->cl_count);
Trond Myklebust2446ab62012-03-01 17:00:56 -05001160
1161 /* The rcu_read_lock() is not strictly necessary, as the state
1162 * manager is the only thread that ever changes the rpc_xprt
1163 * after it's initialized. At this point, we're single threaded. */
1164 rcu_read_lock();
1165 snprintf(buf, sizeof(buf), "%s-manager",
1166 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1167 rcu_read_unlock();
Kees Cookf1701682013-07-03 15:04:58 -07001168 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
Trond Myklebust2446ab62012-03-01 17:00:56 -05001169 if (IS_ERR(task)) {
1170 printk(KERN_ERR "%s: kthread_run: %ld\n",
1171 __func__, PTR_ERR(task));
1172 nfs4_clear_state_manager_bit(clp);
1173 nfs_put_client(clp);
1174 module_put(THIS_MODULE);
1175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176}
1177
1178/*
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001179 * Schedule a lease recovery attempt
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 */
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001181void nfs4_schedule_lease_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182{
1183 if (!clp)
1184 return;
Trond Myklebuste598d842008-12-23 15:21:42 -05001185 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1186 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001187 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1188 clp->cl_hostname);
Trond Myklebuste005e802008-12-23 15:21:48 -05001189 nfs4_schedule_state_manager(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190}
Andy Adamson9cb81962012-03-07 10:49:41 -05001191EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192
Chuck Leverc9fdeb22013-10-17 14:13:02 -04001193/**
1194 * nfs4_schedule_migration_recovery - trigger migration recovery
1195 *
1196 * @server: FSID that is migrating
1197 *
1198 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1199 * value is returned.
1200 */
1201int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1202{
1203 struct nfs_client *clp = server->nfs_client;
1204
1205 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1206 pr_err("NFS: volatile file handles not supported (server %s)\n",
1207 clp->cl_hostname);
1208 return -NFS4ERR_IO;
1209 }
1210
1211 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1212 return -NFS4ERR_IO;
1213
1214 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1215 __func__,
1216 (unsigned long long)server->fsid.major,
1217 (unsigned long long)server->fsid.minor,
1218 clp->cl_hostname);
1219
1220 set_bit(NFS_MIG_IN_TRANSITION,
1221 &((struct nfs_server *)server)->mig_status);
1222 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1223
1224 nfs4_schedule_state_manager(clp);
1225 return 0;
1226}
1227EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1228
Chuck Leverb7f7a662013-10-17 14:13:35 -04001229/**
1230 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1231 *
1232 * @clp: server to check for moved leases
1233 *
1234 */
1235void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1236{
1237 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1238 __func__, clp->cl_clientid, clp->cl_hostname);
1239
1240 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1241 nfs4_schedule_state_manager(clp);
1242}
1243EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1244
Trond Myklebust33021272012-11-26 13:13:29 -05001245int nfs4_wait_clnt_recover(struct nfs_client *clp)
1246{
1247 int res;
1248
1249 might_sleep();
1250
Chuck Lever0625c2d2013-10-17 14:14:10 -04001251 atomic_inc(&clp->cl_count);
NeilBrown74316202014-07-07 15:16:04 +10001252 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1253 nfs_wait_bit_killable, TASK_KILLABLE);
Trond Myklebust33021272012-11-26 13:13:29 -05001254 if (res)
Chuck Lever0625c2d2013-10-17 14:14:10 -04001255 goto out;
Trond Myklebust33021272012-11-26 13:13:29 -05001256 if (clp->cl_cons_state < 0)
Chuck Lever0625c2d2013-10-17 14:14:10 -04001257 res = clp->cl_cons_state;
1258out:
1259 nfs_put_client(clp);
1260 return res;
Trond Myklebust33021272012-11-26 13:13:29 -05001261}
1262
1263int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1264{
1265 unsigned int loop;
1266 int ret;
1267
1268 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1269 ret = nfs4_wait_clnt_recover(clp);
1270 if (ret != 0)
1271 break;
1272 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1273 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1274 break;
1275 nfs4_schedule_state_manager(clp);
1276 ret = -EIO;
1277 }
1278 return ret;
1279}
1280
Trond Myklebustad1e3962012-03-10 11:23:15 -05001281/*
1282 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1283 * @clp: client to process
1284 *
1285 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1286 * resend of the SETCLIENTID and hence re-establish the
1287 * callback channel. Then return all existing delegations.
1288 */
1289static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1290{
1291 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1292 nfs_expire_all_delegations(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001293 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1294 clp->cl_hostname);
Trond Myklebustad1e3962012-03-10 11:23:15 -05001295}
1296
Trond Myklebust042b60b2011-08-24 15:07:37 -04001297void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1298{
Trond Myklebustad1e3962012-03-10 11:23:15 -05001299 nfs40_handle_cb_pathdown(clp);
Trond Myklebust042b60b2011-08-24 15:07:37 -04001300 nfs4_schedule_state_manager(clp);
1301}
1302
Trond Myklebustf9feab12011-03-09 16:12:46 -05001303static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001304{
1305
1306 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1307 /* Don't recover state that expired before the reboot */
1308 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1309 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1310 return 0;
1311 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001312 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001313 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1314 return 1;
1315}
1316
Trond Myklebust4f14c192014-02-12 19:15:06 -05001317int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001318{
1319 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1320 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001321 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001322 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1323 return 1;
1324}
1325
Trond Myklebust5d422302013-03-14 16:57:48 -04001326int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001327{
1328 struct nfs_client *clp = server->nfs_client;
1329
Trond Myklebust5d422302013-03-14 16:57:48 -04001330 if (!nfs4_valid_open_stateid(state))
1331 return -EBADF;
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001332 nfs4_state_mark_reclaim_nograce(clp, state);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001333 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1334 clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001335 nfs4_schedule_state_manager(clp);
Trond Myklebust5d422302013-03-14 16:57:48 -04001336 return 0;
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001337}
Andy Adamson9cb81962012-03-07 10:49:41 -05001338EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001339
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001340static struct nfs4_lock_state *
1341nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1342 const nfs4_stateid *stateid)
1343{
1344 struct nfs4_lock_state *pos;
1345
1346 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1347 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1348 continue;
1349 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1350 return pos;
1351 }
1352 return NULL;
1353}
1354
1355static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1356 const nfs4_stateid *stateid)
1357{
1358 bool found = false;
1359
1360 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1361 spin_lock(&state->state_lock);
1362 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1363 found = true;
1364 spin_unlock(&state->state_lock);
1365 }
1366 return found;
1367}
1368
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001369void nfs_inode_find_state_and_recover(struct inode *inode,
1370 const nfs4_stateid *stateid)
1371{
1372 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1373 struct nfs_inode *nfsi = NFS_I(inode);
1374 struct nfs_open_context *ctx;
1375 struct nfs4_state *state;
1376 bool found = false;
1377
1378 spin_lock(&inode->i_lock);
1379 list_for_each_entry(ctx, &nfsi->open_files, list) {
1380 state = ctx->state;
1381 if (state == NULL)
1382 continue;
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001383 if (nfs4_stateid_match_other(&state->stateid, stateid)) {
1384 nfs4_state_mark_reclaim_nograce(clp, state);
1385 found = true;
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001386 continue;
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001387 }
1388 if (nfs_state_lock_state_matches_stateid(state, stateid)) {
1389 nfs4_state_mark_reclaim_nograce(clp, state);
1390 found = true;
1391 }
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001392 }
1393 spin_unlock(&inode->i_lock);
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001394
1395 nfs_inode_find_delegation_state_and_recover(inode, stateid);
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001396 if (found)
1397 nfs4_schedule_state_manager(clp);
1398}
1399
Trond Myklebustc58c8442013-03-18 19:45:14 -04001400static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1401{
1402 struct inode *inode = state->inode;
1403 struct nfs_inode *nfsi = NFS_I(inode);
1404 struct nfs_open_context *ctx;
1405
1406 spin_lock(&inode->i_lock);
1407 list_for_each_entry(ctx, &nfsi->open_files, list) {
1408 if (ctx->state != state)
1409 continue;
1410 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1411 }
1412 spin_unlock(&inode->i_lock);
1413}
1414
Trond Myklebust5d422302013-03-14 16:57:48 -04001415static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1416{
1417 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
Trond Myklebustc58c8442013-03-18 19:45:14 -04001418 nfs4_state_mark_open_context_bad(state);
Trond Myklebust5d422302013-03-14 16:57:48 -04001419}
1420
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001421
Trond Myklebust02860012008-12-23 15:21:40 -05001422static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423{
1424 struct inode *inode = state->inode;
Trond Myklebust19e03c52008-12-23 15:21:44 -05001425 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 struct file_lock *fl;
1427 int status = 0;
Jeff Layton5263e312015-01-16 15:05:55 -05001428 struct file_lock_context *flctx = inode->i_flctx;
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001429 struct list_head *list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001431 if (flctx == NULL)
Trond Myklebust3f09df72009-06-17 13:23:00 -07001432 return 0;
1433
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001434 list = &flctx->flc_posix;
1435
Trond Myklebust3f09df72009-06-17 13:23:00 -07001436 /* Guard against delegation returns and new lock/unlock calls */
Trond Myklebust19e03c52008-12-23 15:21:44 -05001437 down_write(&nfsi->rwsem);
Jeff Layton6109c852015-01-16 15:05:57 -05001438 spin_lock(&flctx->flc_lock);
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001439restart:
1440 list_for_each_entry(fl, list, fl_list) {
Jeff Layton5263e312015-01-16 15:05:55 -05001441 if (nfs_file_open_context(fl->fl_file)->state != state)
1442 continue;
Jeff Layton6109c852015-01-16 15:05:57 -05001443 spin_unlock(&flctx->flc_lock);
Jeff Layton5263e312015-01-16 15:05:55 -05001444 status = ops->recover_lock(state, fl);
1445 switch (status) {
1446 case 0:
1447 break;
1448 case -ESTALE:
1449 case -NFS4ERR_ADMIN_REVOKED:
1450 case -NFS4ERR_STALE_STATEID:
1451 case -NFS4ERR_BAD_STATEID:
1452 case -NFS4ERR_EXPIRED:
1453 case -NFS4ERR_NO_GRACE:
1454 case -NFS4ERR_STALE_CLIENTID:
1455 case -NFS4ERR_BADSESSION:
1456 case -NFS4ERR_BADSLOT:
1457 case -NFS4ERR_BAD_HIGH_SLOT:
1458 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1459 goto out;
1460 default:
1461 pr_err("NFS: %s: unhandled error %d\n",
1462 __func__, status);
1463 case -ENOMEM:
1464 case -NFS4ERR_DENIED:
1465 case -NFS4ERR_RECLAIM_BAD:
1466 case -NFS4ERR_RECLAIM_CONFLICT:
1467 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1468 status = 0;
1469 }
Jeff Layton6109c852015-01-16 15:05:57 -05001470 spin_lock(&flctx->flc_lock);
Jeff Layton5263e312015-01-16 15:05:55 -05001471 }
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001472 if (list == &flctx->flc_posix) {
1473 list = &flctx->flc_flock;
1474 goto restart;
1475 }
Jeff Layton6109c852015-01-16 15:05:57 -05001476 spin_unlock(&flctx->flc_lock);
Trond Myklebust965b5d62009-06-17 13:22:59 -07001477out:
Trond Myklebust19e03c52008-12-23 15:21:44 -05001478 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 return status;
1480}
1481
Trond Myklebust02860012008-12-23 15:21:40 -05001482static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
1484 struct nfs4_state *state;
1485 struct nfs4_lock_state *lock;
1486 int status = 0;
1487
1488 /* Note: we rely on the sp->so_states list being ordered
1489 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1490 * states first.
1491 * This is needed to ensure that the server won't give us any
1492 * read delegations that we have to return if, say, we are
1493 * recovering after a network partition or a reboot from a
1494 * server that doesn't support a grace period.
1495 */
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001496 spin_lock(&sp->so_lock);
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001497 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001498restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001500 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1501 continue;
Trond Myklebust5d422302013-03-14 16:57:48 -04001502 if (!nfs4_valid_open_stateid(state))
1503 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 if (state->state == 0)
1505 continue;
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001506 atomic_inc(&state->count);
1507 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 if (status >= 0) {
Trond Myklebust02860012008-12-23 15:21:40 -05001510 status = nfs4_reclaim_locks(state, ops);
1511 if (status >= 0) {
Jeff Layton1acd1c32013-10-31 13:03:04 -04001512 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
NeilBrown66863902013-08-12 16:52:47 +10001513 spin_lock(&state->state_lock);
1514 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1515 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1516 pr_warn_ratelimited("NFS: "
1517 "%s: Lock reclaim "
1518 "failed!\n", __func__);
1519 }
1520 spin_unlock(&state->state_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001521 }
Olga Kornievskaiaa41cbe82015-09-14 19:54:36 -04001522 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
Olga Kornievskaiae8d975e2015-05-15 11:45:31 -04001523 &state->flags);
Oleg Drokincea7f822016-06-17 16:48:23 -04001524 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001525 spin_lock(&sp->so_lock);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001526 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 }
1529 switch (status) {
1530 default:
Andy Adamson3660cd42013-10-03 12:23:24 -04001531 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1532 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 case -ENOENT:
Trond Myklebust965b5d62009-06-17 13:22:59 -07001534 case -ENOMEM:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001535 case -ESTALE:
Andy Adamson3660cd42013-10-03 12:23:24 -04001536 /* Open state on this file cannot be recovered */
Trond Myklebust5d422302013-03-14 16:57:48 -04001537 nfs4_state_mark_recovery_failed(state, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 break;
Trond Myklebust91876b12013-03-28 14:01:33 -04001539 case -EAGAIN:
1540 ssleep(1);
Trond Myklebust965b5d62009-06-17 13:22:59 -07001541 case -NFS4ERR_ADMIN_REVOKED:
1542 case -NFS4ERR_STALE_STATEID:
1543 case -NFS4ERR_BAD_STATEID:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001544 case -NFS4ERR_RECLAIM_BAD:
1545 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001546 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001547 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 case -NFS4ERR_EXPIRED:
1549 case -NFS4ERR_NO_GRACE:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001550 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -05001552 case -NFS4ERR_BADSESSION:
1553 case -NFS4ERR_BADSLOT:
1554 case -NFS4ERR_BAD_HIGH_SLOT:
1555 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 goto out_err;
1557 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001558 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001559 spin_lock(&sp->so_lock);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001560 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 }
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001562 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001563 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 return 0;
1565out_err:
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001566 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001567 spin_lock(&sp->so_lock);
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001568 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001569 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 return status;
1571}
1572
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001573static void nfs4_clear_open_state(struct nfs4_state *state)
1574{
1575 struct nfs4_lock_state *lock;
1576
1577 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1578 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1579 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1580 clear_bit(NFS_O_RDWR_STATE, &state->flags);
Trond Myklebust4b44b402011-12-09 16:31:52 -05001581 spin_lock(&state->state_lock);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001582 list_for_each_entry(lock, &state->lock_states, ls_locks) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001583 lock->ls_seqid.flags = 0;
Trond Myklebust795a88c2012-09-10 13:26:49 -04001584 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001585 }
Trond Myklebust4b44b402011-12-09 16:31:52 -05001586 spin_unlock(&state->state_lock);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001587}
1588
Chuck Lever24d292b2010-12-24 01:32:43 +00001589static void nfs4_reset_seqids(struct nfs_server *server,
1590 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001591{
Chuck Lever24d292b2010-12-24 01:32:43 +00001592 struct nfs_client *clp = server->nfs_client;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001593 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001594 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001595 struct nfs4_state *state;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001596
Chuck Lever24d292b2010-12-24 01:32:43 +00001597 spin_lock(&clp->cl_lock);
1598 for (pos = rb_first(&server->state_owners);
1599 pos != NULL;
1600 pos = rb_next(pos)) {
1601 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001602 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -07001603 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001604 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001605 if (mark_reclaim(clp, state))
1606 nfs4_clear_open_state(state);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001607 }
Trond Myklebustec073422005-10-20 14:22:47 -07001608 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001609 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001610 spin_unlock(&clp->cl_lock);
1611}
1612
1613static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1614 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1615{
1616 struct nfs_server *server;
1617
1618 rcu_read_lock();
1619 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1620 nfs4_reset_seqids(server, mark_reclaim);
1621 rcu_read_unlock();
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001622}
1623
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001624static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1625{
1626 /* Mark all delegations for reclaim */
1627 nfs_delegation_mark_reclaim(clp);
1628 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1629}
1630
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001631static void nfs4_reclaim_complete(struct nfs_client *clp,
Trond Myklebust965e9c22013-05-20 11:05:17 -04001632 const struct nfs4_state_recovery_ops *ops,
1633 struct rpc_cred *cred)
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001634{
1635 /* Notify the server we're done reclaiming our state */
1636 if (ops->reclaim_complete)
Trond Myklebust965e9c22013-05-20 11:05:17 -04001637 (void)ops->reclaim_complete(clp, cred);
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001638}
1639
Chuck Lever24d292b2010-12-24 01:32:43 +00001640static void nfs4_clear_reclaim_server(struct nfs_server *server)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001641{
Chuck Lever24d292b2010-12-24 01:32:43 +00001642 struct nfs_client *clp = server->nfs_client;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001643 struct nfs4_state_owner *sp;
1644 struct rb_node *pos;
1645 struct nfs4_state *state;
1646
Chuck Lever24d292b2010-12-24 01:32:43 +00001647 spin_lock(&clp->cl_lock);
1648 for (pos = rb_first(&server->state_owners);
1649 pos != NULL;
1650 pos = rb_next(pos)) {
1651 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001652 spin_lock(&sp->so_lock);
1653 list_for_each_entry(state, &sp->so_states, open_states) {
Chuck Lever24d292b2010-12-24 01:32:43 +00001654 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1655 &state->flags))
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001656 continue;
1657 nfs4_state_mark_reclaim_nograce(clp, state);
1658 }
1659 spin_unlock(&sp->so_lock);
1660 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001661 spin_unlock(&clp->cl_lock);
1662}
1663
1664static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1665{
1666 struct nfs_server *server;
1667
1668 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1669 return 0;
1670
1671 rcu_read_lock();
1672 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1673 nfs4_clear_reclaim_server(server);
1674 rcu_read_unlock();
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001675
1676 nfs_delegation_reap_unclaimed(clp);
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001677 return 1;
1678}
1679
1680static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1681{
Trond Myklebust965e9c22013-05-20 11:05:17 -04001682 const struct nfs4_state_recovery_ops *ops;
1683 struct rpc_cred *cred;
1684
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001685 if (!nfs4_state_clear_reclaim_reboot(clp))
1686 return;
Trond Myklebust965e9c22013-05-20 11:05:17 -04001687 ops = clp->cl_mvops->reboot_recovery_ops;
Chuck Lever73d8bde2013-07-24 12:28:37 -04001688 cred = nfs4_get_clid_cred(clp);
Trond Myklebust965e9c22013-05-20 11:05:17 -04001689 nfs4_reclaim_complete(clp, ops, cred);
1690 put_rpccred(cred);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001691}
1692
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001693static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1694{
Trond Myklebust45870d62016-09-22 13:38:59 -04001695 nfs_mark_test_expired_all_delegations(clp);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001696 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1697}
1698
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001699static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
Trond Myklebuste598d842008-12-23 15:21:42 -05001700{
1701 switch (error) {
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001702 case 0:
1703 break;
Trond Myklebuste598d842008-12-23 15:21:42 -05001704 case -NFS4ERR_CB_PATH_DOWN:
Trond Myklebustad1e3962012-03-10 11:23:15 -05001705 nfs40_handle_cb_pathdown(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001706 break;
Trond Myklebustc8b7ae3d2009-12-03 15:53:21 -05001707 case -NFS4ERR_NO_GRACE:
1708 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001709 break;
Trond Myklebuste598d842008-12-23 15:21:42 -05001710 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebuste598d842008-12-23 15:21:42 -05001711 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001712 nfs4_state_clear_reclaim_reboot(clp);
Trond Myklebuste598d842008-12-23 15:21:42 -05001713 nfs4_state_start_reclaim_reboot(clp);
1714 break;
1715 case -NFS4ERR_EXPIRED:
1716 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1717 nfs4_state_start_reclaim_nograce(clp);
Andy Adamson8ba9bf82009-12-04 15:55:34 -05001718 break;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001719 case -NFS4ERR_BADSESSION:
1720 case -NFS4ERR_BADSLOT:
1721 case -NFS4ERR_BAD_HIGH_SLOT:
1722 case -NFS4ERR_DEADSESSION:
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001723 case -NFS4ERR_SEQ_FALSE_RETRY:
1724 case -NFS4ERR_SEQ_MISORDERED:
Andy Adamson6df08182009-12-04 15:55:05 -05001725 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
Andy Adamson0b9e2d42009-12-04 16:02:14 -05001726 /* Zero session reset errors */
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001727 break;
Trond Myklebust7c5d7252012-05-27 12:58:48 -04001728 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1729 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1730 break;
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001731 default:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001732 dprintk("%s: failed to handle error %d for server %s\n",
1733 __func__, error, clp->cl_hostname);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001734 return error;
Trond Myklebuste598d842008-12-23 15:21:42 -05001735 }
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001736 dprintk("%s: handled error %d for server %s\n", __func__, error,
1737 clp->cl_hostname);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001738 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001739}
1740
Trond Myklebust02860012008-12-23 15:21:40 -05001741static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742{
Chuck Lever24d292b2010-12-24 01:32:43 +00001743 struct nfs4_state_owner *sp;
1744 struct nfs_server *server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001745 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 int status = 0;
1747
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001748restart:
Chuck Lever24d292b2010-12-24 01:32:43 +00001749 rcu_read_lock();
1750 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
Chuck Lever0aaaf5c2011-12-06 16:13:48 -05001751 nfs4_purge_state_owners(server);
Chuck Lever24d292b2010-12-24 01:32:43 +00001752 spin_lock(&clp->cl_lock);
1753 for (pos = rb_first(&server->state_owners);
1754 pos != NULL;
1755 pos = rb_next(pos)) {
1756 sp = rb_entry(pos,
1757 struct nfs4_state_owner, so_server_node);
1758 if (!test_and_clear_bit(ops->owner_flag_bit,
1759 &sp->so_flags))
1760 continue;
Trond Myklebust4a0954e2015-10-02 11:11:16 -04001761 if (!atomic_inc_not_zero(&sp->so_count))
1762 continue;
Chuck Lever24d292b2010-12-24 01:32:43 +00001763 spin_unlock(&clp->cl_lock);
1764 rcu_read_unlock();
1765
1766 status = nfs4_reclaim_open_state(sp, ops);
1767 if (status < 0) {
1768 set_bit(ops->owner_flag_bit, &sp->so_flags);
1769 nfs4_put_state_owner(sp);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04001770 status = nfs4_recovery_handle_error(clp, status);
1771 return (status != 0) ? status : -EAGAIN;
Chuck Lever24d292b2010-12-24 01:32:43 +00001772 }
1773
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001774 nfs4_put_state_owner(sp);
Chuck Lever24d292b2010-12-24 01:32:43 +00001775 goto restart;
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001776 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001777 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001778 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001779 rcu_read_unlock();
Trond Myklebustdf817ba32014-09-27 17:41:51 -04001780 return 0;
Trond Myklebust02860012008-12-23 15:21:40 -05001781}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782
Trond Myklebust02860012008-12-23 15:21:40 -05001783static int nfs4_check_lease(struct nfs_client *clp)
1784{
1785 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001786 const struct nfs4_state_maintenance_ops *ops =
1787 clp->cl_mvops->state_renewal_ops;
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001788 int status;
Trond Myklebust02860012008-12-23 15:21:40 -05001789
Trond Myklebust0f605b52008-12-23 15:21:42 -05001790 /* Is the client already known to have an expired lease? */
1791 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1792 return 0;
Andy Adamsona7b72102009-04-01 09:22:46 -04001793 spin_lock(&clp->cl_lock);
1794 cred = ops->get_state_renewal_cred_locked(clp);
1795 spin_unlock(&clp->cl_lock);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001796 if (cred == NULL) {
Chuck Lever73d8bde2013-07-24 12:28:37 -04001797 cred = nfs4_get_clid_cred(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001798 status = -ENOKEY;
Trond Myklebust0f605b52008-12-23 15:21:42 -05001799 if (cred == NULL)
1800 goto out;
Trond Myklebust02860012008-12-23 15:21:40 -05001801 }
Benny Halevy8e69514f2009-04-01 09:22:45 -04001802 status = ops->renew_lease(clp, cred);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001803 put_rpccred(cred);
Trond Myklebustbc7a05c2013-04-08 17:50:28 -04001804 if (status == -ETIMEDOUT) {
1805 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1806 return 0;
1807 }
Trond Myklebust0f605b52008-12-23 15:21:42 -05001808out:
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001809 return nfs4_recovery_handle_error(clp, status);
Trond Myklebust02860012008-12-23 15:21:40 -05001810}
1811
Andy Adamson47b803c2012-10-01 20:42:32 -04001812/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1813 * and for recoverable errors on EXCHANGE_ID for v4.1
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001814 */
1815static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1816{
1817 switch (status) {
Trond Myklebust89a21732012-05-25 15:00:06 -04001818 case -NFS4ERR_SEQ_MISORDERED:
1819 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1820 return -ESERVERFAULT;
1821 /* Lease confirmation error: retry after purging the lease */
1822 ssleep(1);
Andy Adamson47b803c2012-10-01 20:42:32 -04001823 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1824 break;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001825 case -NFS4ERR_STALE_CLIENTID:
1826 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Andy Adamson47b803c2012-10-01 20:42:32 -04001827 nfs4_state_start_reclaim_reboot(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001828 break;
Chuck Leverde734832012-07-11 16:30:50 -04001829 case -NFS4ERR_CLID_INUSE:
1830 pr_err("NFS: Server %s reports our clientid is in use\n",
1831 clp->cl_hostname);
1832 nfs_mark_client_ready(clp, -EPERM);
1833 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1834 return -EPERM;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001835 case -EACCES:
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001836 case -NFS4ERR_DELAY:
1837 case -ETIMEDOUT:
1838 case -EAGAIN:
1839 ssleep(1);
1840 break;
1841
1842 case -NFS4ERR_MINOR_VERS_MISMATCH:
1843 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1844 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001845 dprintk("%s: exit with error %d for server %s\n",
1846 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001847 return -EPROTONOSUPPORT;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001848 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1849 * in nfs4_exchange_id */
1850 default:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001851 dprintk("%s: exit with error %d for server %s\n", __func__,
1852 status, clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001853 return status;
1854 }
1855 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001856 dprintk("%s: handled error %d for server %s\n", __func__, status,
1857 clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001858 return 0;
1859}
1860
Trond Myklebustb42353f2012-06-05 11:19:47 -04001861static int nfs4_establish_lease(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05001862{
1863 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001864 const struct nfs4_state_recovery_ops *ops =
1865 clp->cl_mvops->reboot_recovery_ops;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001866 int status;
Trond Myklebust02860012008-12-23 15:21:40 -05001867
Trond Myklebust5cae02f2015-06-01 10:30:11 -04001868 nfs4_begin_drain_session(clp);
Chuck Lever73d8bde2013-07-24 12:28:37 -04001869 cred = nfs4_get_clid_cred(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001870 if (cred == NULL)
1871 return -ENOENT;
1872 status = ops->establish_clid(clp, cred);
1873 put_rpccred(cred);
1874 if (status != 0)
Trond Myklebustb42353f2012-06-05 11:19:47 -04001875 return status;
1876 pnfs_destroy_all_layouts(clp);
1877 return 0;
1878}
1879
Chuck Lever6bbb4ae2012-07-11 16:30:59 -04001880/*
1881 * Returns zero or a negative errno. NFS4ERR values are converted
1882 * to local errno values.
1883 */
Trond Myklebustb42353f2012-06-05 11:19:47 -04001884static int nfs4_reclaim_lease(struct nfs_client *clp)
1885{
1886 int status;
1887
1888 status = nfs4_establish_lease(clp);
1889 if (status < 0)
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001890 return nfs4_handle_reclaim_lease_error(clp, status);
Trond Myklebustb42353f2012-06-05 11:19:47 -04001891 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1892 nfs4_state_start_reclaim_nograce(clp);
1893 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1894 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1895 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1896 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1897 return 0;
1898}
1899
1900static int nfs4_purge_lease(struct nfs_client *clp)
1901{
1902 int status;
1903
1904 status = nfs4_establish_lease(clp);
1905 if (status < 0)
1906 return nfs4_handle_reclaim_lease_error(clp, status);
1907 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1908 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1909 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001910 return 0;
Trond Myklebust02860012008-12-23 15:21:40 -05001911}
1912
Chuck Leverc9fdeb22013-10-17 14:13:02 -04001913/*
1914 * Try remote migration of one FSID from a source server to a
1915 * destination server. The source server provides a list of
1916 * potential destinations.
1917 *
1918 * Returns zero or a negative NFS4ERR status code.
1919 */
1920static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1921{
1922 struct nfs_client *clp = server->nfs_client;
1923 struct nfs4_fs_locations *locations = NULL;
1924 struct inode *inode;
1925 struct page *page;
1926 int status, result;
1927
1928 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1929 (unsigned long long)server->fsid.major,
1930 (unsigned long long)server->fsid.minor,
1931 clp->cl_hostname);
1932
1933 result = 0;
1934 page = alloc_page(GFP_KERNEL);
1935 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1936 if (page == NULL || locations == NULL) {
1937 dprintk("<-- %s: no memory\n", __func__);
1938 goto out;
1939 }
1940
David Howells2b0143b2015-03-17 22:25:59 +00001941 inode = d_inode(server->super->s_root);
Chuck Leverc9fdeb22013-10-17 14:13:02 -04001942 result = nfs4_proc_get_locations(inode, locations, page, cred);
1943 if (result) {
1944 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1945 __func__, result);
1946 goto out;
1947 }
1948
1949 result = -NFS4ERR_NXIO;
1950 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1951 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1952 __func__);
1953 goto out;
1954 }
1955
1956 nfs4_begin_drain_session(clp);
1957
1958 status = nfs4_replace_transport(server, locations);
1959 if (status != 0) {
1960 dprintk("<-- %s: failed to replace transport: %d\n",
1961 __func__, status);
1962 goto out;
1963 }
1964
1965 result = 0;
1966 dprintk("<-- %s: migration succeeded\n", __func__);
1967
1968out:
1969 if (page != NULL)
1970 __free_page(page);
1971 kfree(locations);
1972 if (result) {
1973 pr_err("NFS: migration recovery failed (server %s)\n",
1974 clp->cl_hostname);
1975 set_bit(NFS_MIG_FAILED, &server->mig_status);
1976 }
1977 return result;
1978}
1979
1980/*
1981 * Returns zero or a negative NFS4ERR status code.
1982 */
1983static int nfs4_handle_migration(struct nfs_client *clp)
1984{
1985 const struct nfs4_state_maintenance_ops *ops =
1986 clp->cl_mvops->state_renewal_ops;
1987 struct nfs_server *server;
1988 struct rpc_cred *cred;
1989
1990 dprintk("%s: migration reported on \"%s\"\n", __func__,
1991 clp->cl_hostname);
1992
1993 spin_lock(&clp->cl_lock);
1994 cred = ops->get_state_renewal_cred_locked(clp);
1995 spin_unlock(&clp->cl_lock);
1996 if (cred == NULL)
1997 return -NFS4ERR_NOENT;
1998
1999 clp->cl_mig_gen++;
2000restart:
2001 rcu_read_lock();
2002 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2003 int status;
2004
2005 if (server->mig_gen == clp->cl_mig_gen)
2006 continue;
2007 server->mig_gen = clp->cl_mig_gen;
2008
2009 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2010 &server->mig_status))
2011 continue;
2012
2013 rcu_read_unlock();
2014 status = nfs4_try_migration(server, cred);
2015 if (status < 0) {
2016 put_rpccred(cred);
2017 return status;
2018 }
2019 goto restart;
2020 }
2021 rcu_read_unlock();
2022 put_rpccred(cred);
2023 return 0;
2024}
2025
Chuck Leverb7f7a662013-10-17 14:13:35 -04002026/*
2027 * Test each nfs_server on the clp's cl_superblocks list to see
2028 * if it's moved to another server. Stop when the server no longer
2029 * returns NFS4ERR_LEASE_MOVED.
2030 */
2031static int nfs4_handle_lease_moved(struct nfs_client *clp)
2032{
2033 const struct nfs4_state_maintenance_ops *ops =
2034 clp->cl_mvops->state_renewal_ops;
2035 struct nfs_server *server;
2036 struct rpc_cred *cred;
2037
2038 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2039 clp->cl_hostname);
2040
2041 spin_lock(&clp->cl_lock);
2042 cred = ops->get_state_renewal_cred_locked(clp);
2043 spin_unlock(&clp->cl_lock);
2044 if (cred == NULL)
2045 return -NFS4ERR_NOENT;
2046
2047 clp->cl_mig_gen++;
2048restart:
2049 rcu_read_lock();
2050 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2051 struct inode *inode;
2052 int status;
2053
2054 if (server->mig_gen == clp->cl_mig_gen)
2055 continue;
2056 server->mig_gen = clp->cl_mig_gen;
2057
2058 rcu_read_unlock();
2059
David Howells2b0143b2015-03-17 22:25:59 +00002060 inode = d_inode(server->super->s_root);
Chuck Leverb7f7a662013-10-17 14:13:35 -04002061 status = nfs4_proc_fsid_present(inode, cred);
2062 if (status != -NFS4ERR_MOVED)
2063 goto restart; /* wasn't this one */
2064 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2065 goto restart; /* there are more */
2066 goto out;
2067 }
2068 rcu_read_unlock();
2069
2070out:
2071 put_rpccred(cred);
2072 return 0;
2073}
2074
Chuck Lever05f4c352012-09-14 17:24:32 -04002075/**
2076 * nfs4_discover_server_trunking - Detect server IP address trunking
2077 *
2078 * @clp: nfs_client under test
2079 * @result: OUT: found nfs_client, or clp
2080 *
2081 * Returns zero or a negative errno. If zero is returned,
2082 * an nfs_client pointer is planted in "result".
2083 *
2084 * Note: since we are invoked in process context, and
2085 * not from inside the state manager, we cannot use
2086 * nfs4_handle_reclaim_lease_error().
2087 */
2088int nfs4_discover_server_trunking(struct nfs_client *clp,
2089 struct nfs_client **result)
2090{
2091 const struct nfs4_state_recovery_ops *ops =
2092 clp->cl_mvops->reboot_recovery_ops;
Chuck Lever05f4c352012-09-14 17:24:32 -04002093 struct rpc_clnt *clnt;
2094 struct rpc_cred *cred;
Chuck Lever4edaa302013-03-16 15:56:20 -04002095 int i, status;
Chuck Lever05f4c352012-09-14 17:24:32 -04002096
2097 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2098
Chuck Lever05f4c352012-09-14 17:24:32 -04002099 clnt = clp->cl_rpcclient;
Chuck Lever05f4c352012-09-14 17:24:32 -04002100 i = 0;
2101
2102 mutex_lock(&nfs_clid_init_mutex);
Chuck Lever05f4c352012-09-14 17:24:32 -04002103again:
Trond Myklebustea33e6c2013-04-05 13:22:50 -04002104 status = -ENOENT;
Chuck Lever73d8bde2013-07-24 12:28:37 -04002105 cred = nfs4_get_clid_cred(clp);
Chuck Lever05f4c352012-09-14 17:24:32 -04002106 if (cred == NULL)
2107 goto out_unlock;
2108
2109 status = ops->detect_trunking(clp, result, cred);
2110 put_rpccred(cred);
2111 switch (status) {
2112 case 0:
2113 break;
Chuck Lever05f4c352012-09-14 17:24:32 -04002114 case -ETIMEDOUT:
Trond Myklebust150e7262014-03-18 14:23:11 -04002115 if (clnt->cl_softrtry)
2116 break;
2117 case -NFS4ERR_DELAY:
Chuck Lever05f4c352012-09-14 17:24:32 -04002118 case -EAGAIN:
2119 ssleep(1);
Trond Myklebust202c3122013-01-18 22:56:23 -05002120 case -NFS4ERR_STALE_CLIENTID:
Chuck Lever05f4c352012-09-14 17:24:32 -04002121 dprintk("NFS: %s after status %d, retrying\n",
2122 __func__, status);
2123 goto again;
Chuck Lever4edaa302013-03-16 15:56:20 -04002124 case -EACCES:
Chuck Leverd688f7b2013-07-24 12:28:28 -04002125 if (i++ == 0) {
2126 nfs4_root_machine_cred(clp);
2127 goto again;
2128 }
Jeff Layton6d769f12013-11-13 09:08:21 -05002129 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
Chuck Lever4edaa302013-03-16 15:56:20 -04002130 break;
Chuck Lever05f4c352012-09-14 17:24:32 -04002131 case -NFS4ERR_CLID_INUSE:
2132 case -NFS4ERR_WRONGSEC:
Jeff Layton6d769f12013-11-13 09:08:21 -05002133 /* No point in retrying if we already used RPC_AUTH_UNIX */
2134 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2135 status = -EPERM;
2136 break;
2137 }
Chuck Lever79d852b2013-04-22 15:42:48 -04002138 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
Chuck Lever05f4c352012-09-14 17:24:32 -04002139 if (IS_ERR(clnt)) {
2140 status = PTR_ERR(clnt);
2141 break;
2142 }
Trond Myklebustb193d592013-04-04 15:55:00 -04002143 /* Note: this is safe because we haven't yet marked the
2144 * client as ready, so we are the only user of
2145 * clp->cl_rpcclient
2146 */
2147 clnt = xchg(&clp->cl_rpcclient, clnt);
2148 rpc_shutdown_client(clnt);
2149 clnt = clp->cl_rpcclient;
Chuck Lever05f4c352012-09-14 17:24:32 -04002150 goto again;
2151
2152 case -NFS4ERR_MINOR_VERS_MISMATCH:
2153 status = -EPROTONOSUPPORT;
2154 break;
2155
2156 case -EKEYEXPIRED:
Chuck Lever05f4c352012-09-14 17:24:32 -04002157 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2158 * in nfs4_exchange_id */
2159 status = -EKEYEXPIRED;
Trond Myklebustea33e6c2013-04-05 13:22:50 -04002160 break;
2161 default:
2162 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2163 __func__, status);
2164 status = -EIO;
Chuck Lever05f4c352012-09-14 17:24:32 -04002165 }
2166
2167out_unlock:
2168 mutex_unlock(&nfs_clid_init_mutex);
Chuck Lever05f4c352012-09-14 17:24:32 -04002169 dprintk("NFS: %s: status = %d\n", __func__, status);
2170 return status;
2171}
2172
Andy Adamson76db6d92009-04-01 09:22:38 -04002173#ifdef CONFIG_NFS_V4_1
Trond Myklebust9f594792012-05-27 13:02:53 -04002174void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002175{
Trond Myklebust444f72f2011-05-26 14:26:35 -04002176 struct nfs_client *clp = session->clp;
2177
Trond Myklebust9f594792012-05-27 13:02:53 -04002178 switch (err) {
2179 default:
2180 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2181 break;
2182 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2183 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2184 }
Trond Myklebust444f72f2011-05-26 14:26:35 -04002185 nfs4_schedule_lease_recovery(clp);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002186}
Andy Adamsoncbdabc7f2011-03-01 01:34:20 +00002187EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002188
Anna Schumaker3f10a6a2015-07-13 14:01:31 -04002189void nfs41_notify_server(struct nfs_client *clp)
Trond Myklebustac074832012-11-21 09:06:11 -05002190{
2191 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2192 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2193 nfs4_schedule_state_manager(clp);
2194}
2195
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002196static void nfs4_reset_all_state(struct nfs_client *clp)
2197{
2198 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
Chuck Lever2c820d92012-05-21 22:45:33 -04002199 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
Trond Myklebustbe0bfed2012-05-25 16:02:15 -04002200 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002201 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002202 dprintk("%s: scheduling reset of all state for server %s!\n",
2203 __func__, clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002204 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002205 }
2206}
2207
2208static void nfs41_handle_server_reboot(struct nfs_client *clp)
2209{
2210 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2211 nfs4_state_start_reclaim_reboot(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002212 dprintk("%s: server %s rebooted!\n", __func__,
2213 clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002214 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002215 }
2216}
2217
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002218static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002219{
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002220 nfs4_reset_all_state(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002221 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002222}
2223
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002224static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2225{
Trond Myklebust45870d62016-09-22 13:38:59 -04002226 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002227 nfs4_schedule_state_manager(clp);
2228
2229 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2230}
2231
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002232static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2233{
Trond Myklebust40992872015-07-05 15:20:53 -04002234 /* FIXME: For now, we destroy all layouts. */
2235 pnfs_destroy_all_layouts(clp);
2236 /* FIXME: For now, we test all delegations+open state+locks. */
2237 nfs41_handle_some_state_revoked(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002238 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2239 clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002240}
2241
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002242static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002243{
Trond Myklebustb1352902015-07-05 15:26:58 -04002244 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2245 nfs4_schedule_state_manager(clp);
2246
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002247 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2248 clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002249}
2250
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002251static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2252{
2253 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2254 &clp->cl_state) == 0)
2255 nfs4_schedule_state_manager(clp);
2256}
2257
Trond Myklebust0a014a42016-09-22 13:38:51 -04002258void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2259 bool recovery)
Alexandros Batsakis0629e372009-12-05 13:46:14 -05002260{
2261 if (!flags)
2262 return;
Chuck Lever2c820d92012-05-21 22:45:33 -04002263
2264 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2265 __func__, clp->cl_hostname, clp->cl_clientid, flags);
Trond Myklebust0a014a42016-09-22 13:38:51 -04002266 /*
2267 * If we're called from the state manager thread, then assume we're
2268 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2269 * Those flags are expected to remain set until we're done
2270 * recovering (see RFC5661, section 18.46.3).
2271 */
2272 if (recovery)
2273 goto out_recovery;
Chuck Lever2c820d92012-05-21 22:45:33 -04002274
Trond Myklebust111d4892011-12-01 16:37:42 -05002275 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002276 nfs41_handle_server_reboot(clp);
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002277 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2278 nfs41_handle_all_state_revoked(clp);
2279 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
Chuck Leverd1c23312013-10-17 14:13:58 -04002280 SEQ4_STATUS_ADMIN_STATE_REVOKED))
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002281 nfs41_handle_some_state_revoked(clp);
Chuck Leverd1c23312013-10-17 14:13:58 -04002282 if (flags & SEQ4_STATUS_LEASE_MOVED)
2283 nfs4_schedule_lease_moved_recovery(clp);
Trond Myklebust111d4892011-12-01 16:37:42 -05002284 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002285 nfs41_handle_recallable_state_revoked(clp);
Trond Myklebust0a014a42016-09-22 13:38:51 -04002286out_recovery:
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002287 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2288 nfs41_handle_backchannel_fault(clp);
2289 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2290 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002291 nfs41_handle_cb_path_down(clp);
Alexandros Batsakis0629e372009-12-05 13:46:14 -05002292}
2293
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002294static int nfs4_reset_session(struct nfs_client *clp)
2295{
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002296 struct rpc_cred *cred;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002297 int status;
2298
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002299 if (!nfs4_has_session(clp))
2300 return 0;
Trond Myklebust38045412009-12-15 17:36:57 -05002301 nfs4_begin_drain_session(clp);
Chuck Lever73d8bde2013-07-24 12:28:37 -04002302 cred = nfs4_get_clid_cred(clp);
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002303 status = nfs4_proc_destroy_session(clp->cl_session, cred);
Trond Myklebustc489ee22013-01-30 13:04:10 -05002304 switch (status) {
2305 case 0:
2306 case -NFS4ERR_BADSESSION:
2307 case -NFS4ERR_DEADSESSION:
2308 break;
2309 case -NFS4ERR_BACK_CHAN_BUSY:
2310 case -NFS4ERR_DELAY:
2311 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2312 status = 0;
2313 ssleep(1);
2314 goto out;
2315 default:
Ricardo Labiagaf4558482009-12-07 09:16:09 -05002316 status = nfs4_recovery_handle_error(clp, status);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002317 goto out;
2318 }
2319
2320 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002321 status = nfs4_proc_create_session(clp, cred);
Andy Adamson41f54a52010-01-21 14:54:13 -05002322 if (status) {
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002323 dprintk("%s: session reset failed with status %d for server %s!\n",
2324 __func__, status, clp->cl_hostname);
Trond Myklebustf2c1b512012-05-27 14:46:46 -04002325 status = nfs4_handle_reclaim_lease_error(clp, status);
Andy Adamson41f54a52010-01-21 14:54:13 -05002326 goto out;
2327 }
Trond Myklebustbda197f2012-06-05 10:22:14 -04002328 nfs41_finish_session_reset(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002329 dprintk("%s: session reset was successful for server %s!\n",
2330 __func__, clp->cl_hostname);
Andy Adamson41f54a52010-01-21 14:54:13 -05002331out:
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002332 if (cred)
2333 put_rpccred(cred);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002334 return status;
2335}
Andy Adamson76db6d92009-04-01 09:22:38 -04002336
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002337static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2338{
Trond Myklebust2cf047c2012-05-25 17:57:41 -04002339 struct rpc_cred *cred;
2340 int ret;
2341
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002342 if (!nfs4_has_session(clp))
2343 return 0;
Trond Myklebust43ac5442012-05-27 13:47:21 -04002344 nfs4_begin_drain_session(clp);
Chuck Lever73d8bde2013-07-24 12:28:37 -04002345 cred = nfs4_get_clid_cred(clp);
Trond Myklebust2cf047c2012-05-25 17:57:41 -04002346 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2347 if (cred)
2348 put_rpccred(cred);
Trond Myklebust43ac5442012-05-27 13:47:21 -04002349 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
Trond Myklebustbf674c82012-05-27 12:53:10 -04002350 switch (ret) {
2351 case 0:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002352 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2353 __func__, clp->cl_hostname);
Trond Myklebustbf674c82012-05-27 12:53:10 -04002354 break;
2355 case -NFS4ERR_DELAY:
2356 ssleep(1);
2357 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2358 break;
2359 default:
2360 return nfs4_recovery_handle_error(clp, ret);
2361 }
2362 return 0;
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002363}
Andy Adamson76db6d92009-04-01 09:22:38 -04002364#else /* CONFIG_NFS_V4_1 */
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002365static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002366
2367static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2368{
2369 return 0;
2370}
Andy Adamson76db6d92009-04-01 09:22:38 -04002371#endif /* CONFIG_NFS_V4_1 */
2372
Trond Myklebuste005e802008-12-23 15:21:48 -05002373static void nfs4_state_manager(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05002374{
Trond Myklebust02860012008-12-23 15:21:40 -05002375 int status = 0;
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002376 const char *section = "", *section_sep = "";
Trond Myklebust02860012008-12-23 15:21:40 -05002377
Trond Myklebust02860012008-12-23 15:21:40 -05002378 /* Ensure exclusive access to NFSv4 state */
Trond Myklebust47c21992011-04-15 17:34:18 -04002379 do {
Chuck Lever2c820d92012-05-21 22:45:33 -04002380 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002381 section = "purge state";
Trond Myklebustb42353f2012-06-05 11:19:47 -04002382 status = nfs4_purge_lease(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04002383 if (status < 0)
2384 goto out_error;
Trond Myklebustb42353f2012-06-05 11:19:47 -04002385 continue;
Chuck Lever2c820d92012-05-21 22:45:33 -04002386 }
2387
Trond Myklebustb42353f2012-06-05 11:19:47 -04002388 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002389 section = "lease expired";
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002390 /* We're going to have to re-establish a clientid */
2391 status = nfs4_reclaim_lease(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04002392 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002393 goto out_error;
Trond Myklebustb42353f2012-06-05 11:19:47 -04002394 continue;
Trond Myklebuste598d842008-12-23 15:21:42 -05002395 }
2396
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002397 /* Initialize or reset the session */
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002398 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002399 section = "reset session";
Andy Adamson4d643d12009-12-04 15:52:24 -05002400 status = nfs4_reset_session(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002401 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2402 continue;
2403 if (status < 0)
Andy Adamson76db6d92009-04-01 09:22:38 -04002404 goto out_error;
Andy Adamson76db6d92009-04-01 09:22:38 -04002405 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002406
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002407 /* Send BIND_CONN_TO_SESSION */
2408 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002409 &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002410 section = "bind conn to session";
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002411 status = nfs4_bind_conn_to_session(clp);
2412 if (status < 0)
2413 goto out_error;
Trond Myklebustbf674c82012-05-27 12:53:10 -04002414 continue;
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002415 }
2416
Trond Myklebust5df904a2012-11-21 09:22:14 -05002417 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2418 section = "check lease";
2419 status = nfs4_check_lease(clp);
2420 if (status < 0)
2421 goto out_error;
Olga Kornievskaia8faaa6d2014-09-24 18:11:28 -04002422 continue;
Chuck Leverc9fdeb22013-10-17 14:13:02 -04002423 }
2424
2425 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2426 section = "migration";
2427 status = nfs4_handle_migration(clp);
2428 if (status < 0)
2429 goto out_error;
Trond Myklebust5df904a2012-11-21 09:22:14 -05002430 }
2431
Chuck Leverb7f7a662013-10-17 14:13:35 -04002432 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2433 section = "lease moved";
2434 status = nfs4_handle_lease_moved(clp);
2435 if (status < 0)
2436 goto out_error;
2437 }
2438
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002439 /* First recover reboot state... */
Trond Myklebuste345e882009-12-03 15:52:41 -05002440 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002441 section = "reclaim reboot";
Andy Adamson591d71c2009-04-01 09:22:47 -04002442 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04002443 clp->cl_mvops->reboot_recovery_ops);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002444 if (status == -EAGAIN)
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002445 continue;
2446 if (status < 0)
2447 goto out_error;
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002448 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002449 }
2450
Trond Myklebust45870d62016-09-22 13:38:59 -04002451 /* Detect expired delegations... */
2452 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2453 section = "detect expired delegations";
2454 nfs_reap_expired_delegations(clp);
2455 continue;
2456 }
2457
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002458 /* Now recover expired state... */
2459 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002460 section = "reclaim nograce";
Andy Adamson591d71c2009-04-01 09:22:47 -04002461 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04002462 clp->cl_mvops->nograce_recovery_ops);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002463 if (status == -EAGAIN)
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002464 continue;
2465 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002466 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002467 }
Trond Myklebust707fb4b2008-12-23 15:21:47 -05002468
Alexandros Batsakis5601a002009-12-14 21:27:58 -08002469 nfs4_end_drain_session(clp);
Trond Myklebust707fb4b2008-12-23 15:21:47 -05002470 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2471 nfs_client_return_marked_delegations(clp);
2472 continue;
2473 }
Trond Myklebuste005e802008-12-23 15:21:48 -05002474
2475 nfs4_clear_state_manager_bit(clp);
Trond Myklebustf3c76492008-12-23 15:21:48 -05002476 /* Did we race with an attempt to give us more work? */
2477 if (clp->cl_state == 0)
2478 break;
2479 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2480 break;
Trond Myklebust47c21992011-04-15 17:34:18 -04002481 } while (atomic_read(&clp->cl_count) > 1);
Trond Myklebuste005e802008-12-23 15:21:48 -05002482 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483out_error:
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002484 if (strlen(section))
2485 section_sep = ": ";
2486 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2487 " with error %d\n", section_sep, section,
2488 clp->cl_hostname, -status);
Chuck Leverffe5a832012-09-14 17:23:23 -04002489 ssleep(1);
Alexandros Batsakis5601a002009-12-14 21:27:58 -08002490 nfs4_end_drain_session(clp);
Trond Myklebuste005e802008-12-23 15:21:48 -05002491 nfs4_clear_state_manager_bit(clp);
2492}
2493
2494static int nfs4_run_state_manager(void *ptr)
2495{
2496 struct nfs_client *clp = ptr;
2497
2498 allow_signal(SIGKILL);
2499 nfs4_state_manager(clp);
2500 nfs_put_client(clp);
2501 module_put_and_exit(0);
2502 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503}
2504
2505/*
2506 * Local variables:
2507 * c-basic-offset: 8
2508 * End:
2509 */