blob: 5f4281ec5f72c3556d76a479854d6fb378d03124 [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
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -0400994 if (!nfs4_valid_open_stateid(state))
995 return -EIO;
Trond Myklebustabf4e132016-05-16 17:42:44 -0400996 if (cred != NULL)
997 *cred = NULL;
998 ret = nfs4_copy_lock_stateid(dst, state, lockowner);
NeilBrownef1820f2013-09-04 17:04:49 +1000999 if (ret == -EIO)
1000 /* A lost lock - don't even consider delegations */
1001 goto out;
Andy Adamson146d70c2014-02-18 10:36:05 -05001002 /* returns true if delegation stateid found and copied */
Trond Myklebustabf4e132016-05-16 17:42:44 -04001003 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
Andy Adamson146d70c2014-02-18 10:36:05 -05001004 ret = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001005 goto out;
Andy Adamson146d70c2014-02-18 10:36:05 -05001006 }
Trond Myklebust5521abf2013-03-16 20:54:34 -04001007 if (ret != -ENOENT)
NeilBrownef1820f2013-09-04 17:04:49 +10001008 /* nfs4_copy_delegation_stateid() didn't over-write
1009 * dst, so it still has the lock stateid which we now
1010 * choose to use.
1011 */
Trond Myklebust5521abf2013-03-16 20:54:34 -04001012 goto out;
Trond Myklebust927864c2014-03-04 13:12:03 -05001013 nfs4_copy_open_stateid(dst, state);
1014 ret = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001015out:
Trond Myklebust3b664862013-03-17 15:31:15 -04001016 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1017 dst->seqid = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001018 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019}
1020
Trond Myklebust8535b2b2010-05-13 12:51:01 -04001021struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022{
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001023 struct nfs_seqid *new;
1024
Trond Myklebust8535b2b2010-05-13 12:51:01 -04001025 new = kmalloc(sizeof(*new), gfp_mask);
Trond Myklebustbadc76d2015-01-23 18:48:00 -05001026 if (new == NULL)
1027 return ERR_PTR(-ENOMEM);
1028 new->sequence = counter;
1029 INIT_LIST_HEAD(&new->list);
1030 new->task = NULL;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001031 return new;
1032}
1033
Trond Myklebust72211db2009-12-15 14:47:36 -05001034void nfs_release_seqid(struct nfs_seqid *seqid)
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001035{
Trond Myklebust4601df22012-01-20 18:47:05 -05001036 struct nfs_seqid_counter *sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001037
Trond Myklebusta6796412015-01-23 19:04:44 -05001038 if (seqid == NULL || list_empty(&seqid->list))
Trond Myklebust4601df22012-01-20 18:47:05 -05001039 return;
1040 sequence = seqid->sequence;
1041 spin_lock(&sequence->lock);
1042 list_del_init(&seqid->list);
1043 if (!list_empty(&sequence->list)) {
1044 struct nfs_seqid *next;
1045
1046 next = list_first_entry(&sequence->list,
1047 struct nfs_seqid, list);
1048 rpc_wake_up_queued_task(&sequence->wait, next->task);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001049 }
Trond Myklebust4601df22012-01-20 18:47:05 -05001050 spin_unlock(&sequence->lock);
Trond Myklebust72211db2009-12-15 14:47:36 -05001051}
1052
1053void nfs_free_seqid(struct nfs_seqid *seqid)
1054{
1055 nfs_release_seqid(seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001056 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057}
1058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001060 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1061 * failed with a seqid incrementing error -
Toralf Förster16a6ddc2013-12-12 19:09:00 +01001062 * see comments nfs4.h:seqid_mutating_error()
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001063 */
Trond Myklebust88d90932007-07-02 14:03:03 -04001064static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065{
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001066 switch (status) {
1067 case 0:
1068 break;
1069 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -04001070 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1071 return;
Trond Myklebust9a3ba432012-03-12 18:01:48 -04001072 pr_warn_ratelimited("NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -08001073 " sequence-id error on an"
1074 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -04001075 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001076 case -NFS4ERR_STALE_CLIENTID:
1077 case -NFS4ERR_STALE_STATEID:
1078 case -NFS4ERR_BAD_STATEID:
1079 case -NFS4ERR_BADXDR:
1080 case -NFS4ERR_RESOURCE:
1081 case -NFS4ERR_NOFILEHANDLE:
1082 /* Non-seqid mutating errors */
1083 return;
1084 };
1085 /*
1086 * Note: no locking needed as we are guaranteed to be first
1087 * on the sequence list
1088 */
1089 seqid->sequence->counter++;
1090}
1091
1092void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1093{
Trond Myklebusta6796412015-01-23 19:04:44 -05001094 struct nfs4_state_owner *sp;
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001095
Trond Myklebusta6796412015-01-23 19:04:44 -05001096 if (seqid == NULL)
1097 return;
1098
1099 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001100 if (status == -NFS4ERR_BAD_SEQID)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 nfs4_drop_state_owner(sp);
Trond Myklebusta6796412015-01-23 19:04:44 -05001102 if (!nfs4_has_session(sp->so_server->nfs_client))
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001103 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001104}
1105
1106/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001107 * Increment the seqid if the LOCK/LOCKU succeeded, or
1108 * failed with a seqid incrementing error -
Toralf Förster16a6ddc2013-12-12 19:09:00 +01001109 * see comments nfs4.h:seqid_mutating_error()
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001110 */
1111void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1112{
Trond Myklebusta6796412015-01-23 19:04:44 -05001113 if (seqid != NULL)
1114 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001115}
1116
1117int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1118{
Trond Myklebusta6796412015-01-23 19:04:44 -05001119 struct nfs_seqid_counter *sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001120 int status = 0;
1121
Trond Myklebusta6796412015-01-23 19:04:44 -05001122 if (seqid == NULL)
1123 goto out;
1124 sequence = seqid->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001125 spin_lock(&sequence->lock);
Trond Myklebust4601df22012-01-20 18:47:05 -05001126 seqid->task = task;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001127 if (list_empty(&seqid->list))
1128 list_add_tail(&seqid->list, &sequence->list);
1129 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1130 goto unlock;
Trond Myklebust5d008372008-02-22 16:34:17 -05001131 rpc_sleep_on(&sequence->wait, task, NULL);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001132 status = -EAGAIN;
1133unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001134 spin_unlock(&sequence->lock);
Trond Myklebusta6796412015-01-23 19:04:44 -05001135out:
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001136 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137}
1138
Trond Myklebuste005e802008-12-23 15:21:48 -05001139static int nfs4_run_state_manager(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140
Trond Myklebuste005e802008-12-23 15:21:48 -05001141static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +01001142{
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001143 smp_mb__before_atomic();
Trond Myklebuste005e802008-12-23 15:21:48 -05001144 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001145 smp_mb__after_atomic();
Trond Myklebuste005e802008-12-23 15:21:48 -05001146 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
Trond Myklebust433fbe42006-01-03 09:55:22 +01001147 rpc_wake_up(&clp->cl_rpcwaitq);
1148}
1149
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150/*
Trond Myklebuste005e802008-12-23 15:21:48 -05001151 * Schedule the nfs_client asynchronous state management routine
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 */
Trond Myklebustb0d3ded2008-12-23 15:21:50 -05001153void nfs4_schedule_state_manager(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154{
Trond Myklebust5043e902006-01-03 09:55:23 +01001155 struct task_struct *task;
Trond Myklebust2446ab62012-03-01 17:00:56 -05001156 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
Trond Myklebuste005e802008-12-23 15:21:48 -05001158 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1159 return;
Trond Myklebust5043e902006-01-03 09:55:23 +01001160 __module_get(THIS_MODULE);
1161 atomic_inc(&clp->cl_count);
Trond Myklebust2446ab62012-03-01 17:00:56 -05001162
1163 /* The rcu_read_lock() is not strictly necessary, as the state
1164 * manager is the only thread that ever changes the rpc_xprt
1165 * after it's initialized. At this point, we're single threaded. */
1166 rcu_read_lock();
1167 snprintf(buf, sizeof(buf), "%s-manager",
1168 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1169 rcu_read_unlock();
Kees Cookf1701682013-07-03 15:04:58 -07001170 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
Trond Myklebust2446ab62012-03-01 17:00:56 -05001171 if (IS_ERR(task)) {
1172 printk(KERN_ERR "%s: kthread_run: %ld\n",
1173 __func__, PTR_ERR(task));
1174 nfs4_clear_state_manager_bit(clp);
1175 nfs_put_client(clp);
1176 module_put(THIS_MODULE);
1177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178}
1179
1180/*
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001181 * Schedule a lease recovery attempt
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 */
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001183void nfs4_schedule_lease_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184{
1185 if (!clp)
1186 return;
Trond Myklebuste598d842008-12-23 15:21:42 -05001187 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1188 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001189 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1190 clp->cl_hostname);
Trond Myklebuste005e802008-12-23 15:21:48 -05001191 nfs4_schedule_state_manager(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192}
Andy Adamson9cb81962012-03-07 10:49:41 -05001193EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
Chuck Leverc9fdeb22013-10-17 14:13:02 -04001195/**
1196 * nfs4_schedule_migration_recovery - trigger migration recovery
1197 *
1198 * @server: FSID that is migrating
1199 *
1200 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1201 * value is returned.
1202 */
1203int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1204{
1205 struct nfs_client *clp = server->nfs_client;
1206
1207 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1208 pr_err("NFS: volatile file handles not supported (server %s)\n",
1209 clp->cl_hostname);
1210 return -NFS4ERR_IO;
1211 }
1212
1213 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1214 return -NFS4ERR_IO;
1215
1216 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1217 __func__,
1218 (unsigned long long)server->fsid.major,
1219 (unsigned long long)server->fsid.minor,
1220 clp->cl_hostname);
1221
1222 set_bit(NFS_MIG_IN_TRANSITION,
1223 &((struct nfs_server *)server)->mig_status);
1224 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1225
1226 nfs4_schedule_state_manager(clp);
1227 return 0;
1228}
1229EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1230
Chuck Leverb7f7a662013-10-17 14:13:35 -04001231/**
1232 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1233 *
1234 * @clp: server to check for moved leases
1235 *
1236 */
1237void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1238{
1239 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1240 __func__, clp->cl_clientid, clp->cl_hostname);
1241
1242 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1243 nfs4_schedule_state_manager(clp);
1244}
1245EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1246
Trond Myklebust33021272012-11-26 13:13:29 -05001247int nfs4_wait_clnt_recover(struct nfs_client *clp)
1248{
1249 int res;
1250
1251 might_sleep();
1252
Chuck Lever0625c2d2013-10-17 14:14:10 -04001253 atomic_inc(&clp->cl_count);
NeilBrown74316202014-07-07 15:16:04 +10001254 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1255 nfs_wait_bit_killable, TASK_KILLABLE);
Trond Myklebust33021272012-11-26 13:13:29 -05001256 if (res)
Chuck Lever0625c2d2013-10-17 14:14:10 -04001257 goto out;
Trond Myklebust33021272012-11-26 13:13:29 -05001258 if (clp->cl_cons_state < 0)
Chuck Lever0625c2d2013-10-17 14:14:10 -04001259 res = clp->cl_cons_state;
1260out:
1261 nfs_put_client(clp);
1262 return res;
Trond Myklebust33021272012-11-26 13:13:29 -05001263}
1264
1265int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1266{
1267 unsigned int loop;
1268 int ret;
1269
1270 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1271 ret = nfs4_wait_clnt_recover(clp);
1272 if (ret != 0)
1273 break;
1274 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1275 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1276 break;
1277 nfs4_schedule_state_manager(clp);
1278 ret = -EIO;
1279 }
1280 return ret;
1281}
1282
Trond Myklebustad1e3962012-03-10 11:23:15 -05001283/*
1284 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1285 * @clp: client to process
1286 *
1287 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1288 * resend of the SETCLIENTID and hence re-establish the
1289 * callback channel. Then return all existing delegations.
1290 */
1291static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1292{
1293 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1294 nfs_expire_all_delegations(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001295 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1296 clp->cl_hostname);
Trond Myklebustad1e3962012-03-10 11:23:15 -05001297}
1298
Trond Myklebust042b60b2011-08-24 15:07:37 -04001299void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1300{
Trond Myklebustad1e3962012-03-10 11:23:15 -05001301 nfs40_handle_cb_pathdown(clp);
Trond Myklebust042b60b2011-08-24 15:07:37 -04001302 nfs4_schedule_state_manager(clp);
1303}
1304
Trond Myklebustf9feab12011-03-09 16:12:46 -05001305static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001306{
1307
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001308 if (!nfs4_valid_open_stateid(state))
1309 return 0;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001310 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1311 /* Don't recover state that expired before the reboot */
1312 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1313 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1314 return 0;
1315 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001316 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001317 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1318 return 1;
1319}
1320
Trond Myklebust4f14c192014-02-12 19:15:06 -05001321int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001322{
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001323 if (!nfs4_valid_open_stateid(state))
1324 return 0;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001325 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1326 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001327 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001328 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1329 return 1;
1330}
1331
Trond Myklebust5d422302013-03-14 16:57:48 -04001332int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001333{
1334 struct nfs_client *clp = server->nfs_client;
1335
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001336 if (!nfs4_state_mark_reclaim_nograce(clp, state))
Trond Myklebust5d422302013-03-14 16:57:48 -04001337 return -EBADF;
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001338 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1339 clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001340 nfs4_schedule_state_manager(clp);
Trond Myklebust5d422302013-03-14 16:57:48 -04001341 return 0;
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001342}
Andy Adamson9cb81962012-03-07 10:49:41 -05001343EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001344
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001345static struct nfs4_lock_state *
1346nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1347 const nfs4_stateid *stateid)
1348{
1349 struct nfs4_lock_state *pos;
1350
1351 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1352 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1353 continue;
1354 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1355 return pos;
1356 }
1357 return NULL;
1358}
1359
1360static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1361 const nfs4_stateid *stateid)
1362{
1363 bool found = false;
1364
1365 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1366 spin_lock(&state->state_lock);
1367 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1368 found = true;
1369 spin_unlock(&state->state_lock);
1370 }
1371 return found;
1372}
1373
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001374void nfs_inode_find_state_and_recover(struct inode *inode,
1375 const nfs4_stateid *stateid)
1376{
1377 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1378 struct nfs_inode *nfsi = NFS_I(inode);
1379 struct nfs_open_context *ctx;
1380 struct nfs4_state *state;
1381 bool found = false;
1382
1383 spin_lock(&inode->i_lock);
1384 list_for_each_entry(ctx, &nfsi->open_files, list) {
1385 state = ctx->state;
1386 if (state == NULL)
1387 continue;
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001388 if (nfs4_stateid_match_other(&state->stateid, stateid) &&
1389 nfs4_state_mark_reclaim_nograce(clp, state)) {
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001390 found = true;
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001391 continue;
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001392 }
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001393 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1394 nfs4_state_mark_reclaim_nograce(clp, state))
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001395 found = true;
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001396 }
1397 spin_unlock(&inode->i_lock);
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001398
1399 nfs_inode_find_delegation_state_and_recover(inode, stateid);
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001400 if (found)
1401 nfs4_schedule_state_manager(clp);
1402}
1403
Trond Myklebustc58c8442013-03-18 19:45:14 -04001404static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1405{
1406 struct inode *inode = state->inode;
1407 struct nfs_inode *nfsi = NFS_I(inode);
1408 struct nfs_open_context *ctx;
1409
1410 spin_lock(&inode->i_lock);
1411 list_for_each_entry(ctx, &nfsi->open_files, list) {
1412 if (ctx->state != state)
1413 continue;
1414 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1415 }
1416 spin_unlock(&inode->i_lock);
1417}
1418
Trond Myklebust5d422302013-03-14 16:57:48 -04001419static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1420{
1421 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
Trond Myklebustc58c8442013-03-18 19:45:14 -04001422 nfs4_state_mark_open_context_bad(state);
Trond Myklebust5d422302013-03-14 16:57:48 -04001423}
1424
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001425
Trond Myklebust02860012008-12-23 15:21:40 -05001426static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427{
1428 struct inode *inode = state->inode;
Trond Myklebust19e03c52008-12-23 15:21:44 -05001429 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 struct file_lock *fl;
1431 int status = 0;
Jeff Layton5263e312015-01-16 15:05:55 -05001432 struct file_lock_context *flctx = inode->i_flctx;
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001433 struct list_head *list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001435 if (flctx == NULL)
Trond Myklebust3f09df72009-06-17 13:23:00 -07001436 return 0;
1437
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001438 list = &flctx->flc_posix;
1439
Trond Myklebust3f09df72009-06-17 13:23:00 -07001440 /* Guard against delegation returns and new lock/unlock calls */
Trond Myklebust19e03c52008-12-23 15:21:44 -05001441 down_write(&nfsi->rwsem);
Jeff Layton6109c852015-01-16 15:05:57 -05001442 spin_lock(&flctx->flc_lock);
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001443restart:
1444 list_for_each_entry(fl, list, fl_list) {
Jeff Layton5263e312015-01-16 15:05:55 -05001445 if (nfs_file_open_context(fl->fl_file)->state != state)
1446 continue;
Jeff Layton6109c852015-01-16 15:05:57 -05001447 spin_unlock(&flctx->flc_lock);
Jeff Layton5263e312015-01-16 15:05:55 -05001448 status = ops->recover_lock(state, fl);
1449 switch (status) {
1450 case 0:
1451 break;
1452 case -ESTALE:
1453 case -NFS4ERR_ADMIN_REVOKED:
1454 case -NFS4ERR_STALE_STATEID:
1455 case -NFS4ERR_BAD_STATEID:
1456 case -NFS4ERR_EXPIRED:
1457 case -NFS4ERR_NO_GRACE:
1458 case -NFS4ERR_STALE_CLIENTID:
1459 case -NFS4ERR_BADSESSION:
1460 case -NFS4ERR_BADSLOT:
1461 case -NFS4ERR_BAD_HIGH_SLOT:
1462 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1463 goto out;
1464 default:
1465 pr_err("NFS: %s: unhandled error %d\n",
1466 __func__, status);
1467 case -ENOMEM:
1468 case -NFS4ERR_DENIED:
1469 case -NFS4ERR_RECLAIM_BAD:
1470 case -NFS4ERR_RECLAIM_CONFLICT:
1471 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1472 status = 0;
1473 }
Jeff Layton6109c852015-01-16 15:05:57 -05001474 spin_lock(&flctx->flc_lock);
Jeff Layton5263e312015-01-16 15:05:55 -05001475 }
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001476 if (list == &flctx->flc_posix) {
1477 list = &flctx->flc_flock;
1478 goto restart;
1479 }
Jeff Layton6109c852015-01-16 15:05:57 -05001480 spin_unlock(&flctx->flc_lock);
Trond Myklebust965b5d62009-06-17 13:22:59 -07001481out:
Trond Myklebust19e03c52008-12-23 15:21:44 -05001482 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 return status;
1484}
1485
Trond Myklebust02860012008-12-23 15:21:40 -05001486static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487{
1488 struct nfs4_state *state;
1489 struct nfs4_lock_state *lock;
1490 int status = 0;
1491
1492 /* Note: we rely on the sp->so_states list being ordered
1493 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1494 * states first.
1495 * This is needed to ensure that the server won't give us any
1496 * read delegations that we have to return if, say, we are
1497 * recovering after a network partition or a reboot from a
1498 * server that doesn't support a grace period.
1499 */
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001500 spin_lock(&sp->so_lock);
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001501 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001502restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001504 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1505 continue;
Trond Myklebust5d422302013-03-14 16:57:48 -04001506 if (!nfs4_valid_open_stateid(state))
1507 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 if (state->state == 0)
1509 continue;
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001510 atomic_inc(&state->count);
1511 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 if (status >= 0) {
Trond Myklebust02860012008-12-23 15:21:40 -05001514 status = nfs4_reclaim_locks(state, ops);
1515 if (status >= 0) {
Jeff Layton1acd1c32013-10-31 13:03:04 -04001516 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
NeilBrown66863902013-08-12 16:52:47 +10001517 spin_lock(&state->state_lock);
1518 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1519 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1520 pr_warn_ratelimited("NFS: "
1521 "%s: Lock reclaim "
1522 "failed!\n", __func__);
1523 }
1524 spin_unlock(&state->state_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001525 }
Olga Kornievskaiaa41cbe82015-09-14 19:54:36 -04001526 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
Olga Kornievskaiae8d975e2015-05-15 11:45:31 -04001527 &state->flags);
Oleg Drokincea7f822016-06-17 16:48:23 -04001528 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001529 spin_lock(&sp->so_lock);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001530 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 }
1533 switch (status) {
1534 default:
Andy Adamson3660cd42013-10-03 12:23:24 -04001535 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1536 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 case -ENOENT:
Trond Myklebust965b5d62009-06-17 13:22:59 -07001538 case -ENOMEM:
Trond Myklebust304020f2016-09-22 13:39:18 -04001539 case -EACCES:
1540 case -EROFS:
1541 case -EIO:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001542 case -ESTALE:
Andy Adamson3660cd42013-10-03 12:23:24 -04001543 /* Open state on this file cannot be recovered */
Trond Myklebust5d422302013-03-14 16:57:48 -04001544 nfs4_state_mark_recovery_failed(state, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 break;
Trond Myklebust91876b12013-03-28 14:01:33 -04001546 case -EAGAIN:
1547 ssleep(1);
Trond Myklebust965b5d62009-06-17 13:22:59 -07001548 case -NFS4ERR_ADMIN_REVOKED:
1549 case -NFS4ERR_STALE_STATEID:
1550 case -NFS4ERR_BAD_STATEID:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001551 case -NFS4ERR_RECLAIM_BAD:
1552 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001553 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001554 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 case -NFS4ERR_EXPIRED:
1556 case -NFS4ERR_NO_GRACE:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001557 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -05001559 case -NFS4ERR_BADSESSION:
1560 case -NFS4ERR_BADSLOT:
1561 case -NFS4ERR_BAD_HIGH_SLOT:
1562 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 goto out_err;
1564 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001565 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001566 spin_lock(&sp->so_lock);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001567 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 }
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001569 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001570 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 return 0;
1572out_err:
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001573 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001574 spin_lock(&sp->so_lock);
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001575 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001576 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 return status;
1578}
1579
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001580static void nfs4_clear_open_state(struct nfs4_state *state)
1581{
1582 struct nfs4_lock_state *lock;
1583
1584 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1585 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1586 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1587 clear_bit(NFS_O_RDWR_STATE, &state->flags);
Trond Myklebust4b44b402011-12-09 16:31:52 -05001588 spin_lock(&state->state_lock);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001589 list_for_each_entry(lock, &state->lock_states, ls_locks) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001590 lock->ls_seqid.flags = 0;
Trond Myklebust795a88c2012-09-10 13:26:49 -04001591 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001592 }
Trond Myklebust4b44b402011-12-09 16:31:52 -05001593 spin_unlock(&state->state_lock);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001594}
1595
Chuck Lever24d292b2010-12-24 01:32:43 +00001596static void nfs4_reset_seqids(struct nfs_server *server,
1597 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001598{
Chuck Lever24d292b2010-12-24 01:32:43 +00001599 struct nfs_client *clp = server->nfs_client;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001600 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001601 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001602 struct nfs4_state *state;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001603
Chuck Lever24d292b2010-12-24 01:32:43 +00001604 spin_lock(&clp->cl_lock);
1605 for (pos = rb_first(&server->state_owners);
1606 pos != NULL;
1607 pos = rb_next(pos)) {
1608 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001609 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -07001610 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001611 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001612 if (mark_reclaim(clp, state))
1613 nfs4_clear_open_state(state);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001614 }
Trond Myklebustec073422005-10-20 14:22:47 -07001615 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001616 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001617 spin_unlock(&clp->cl_lock);
1618}
1619
1620static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1621 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1622{
1623 struct nfs_server *server;
1624
1625 rcu_read_lock();
1626 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1627 nfs4_reset_seqids(server, mark_reclaim);
1628 rcu_read_unlock();
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001629}
1630
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001631static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1632{
1633 /* Mark all delegations for reclaim */
1634 nfs_delegation_mark_reclaim(clp);
1635 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1636}
1637
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001638static void nfs4_reclaim_complete(struct nfs_client *clp,
Trond Myklebust965e9c22013-05-20 11:05:17 -04001639 const struct nfs4_state_recovery_ops *ops,
1640 struct rpc_cred *cred)
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001641{
1642 /* Notify the server we're done reclaiming our state */
1643 if (ops->reclaim_complete)
Trond Myklebust965e9c22013-05-20 11:05:17 -04001644 (void)ops->reclaim_complete(clp, cred);
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001645}
1646
Chuck Lever24d292b2010-12-24 01:32:43 +00001647static void nfs4_clear_reclaim_server(struct nfs_server *server)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001648{
Chuck Lever24d292b2010-12-24 01:32:43 +00001649 struct nfs_client *clp = server->nfs_client;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001650 struct nfs4_state_owner *sp;
1651 struct rb_node *pos;
1652 struct nfs4_state *state;
1653
Chuck Lever24d292b2010-12-24 01:32:43 +00001654 spin_lock(&clp->cl_lock);
1655 for (pos = rb_first(&server->state_owners);
1656 pos != NULL;
1657 pos = rb_next(pos)) {
1658 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001659 spin_lock(&sp->so_lock);
1660 list_for_each_entry(state, &sp->so_states, open_states) {
Chuck Lever24d292b2010-12-24 01:32:43 +00001661 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1662 &state->flags))
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001663 continue;
1664 nfs4_state_mark_reclaim_nograce(clp, state);
1665 }
1666 spin_unlock(&sp->so_lock);
1667 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001668 spin_unlock(&clp->cl_lock);
1669}
1670
1671static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1672{
1673 struct nfs_server *server;
1674
1675 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1676 return 0;
1677
1678 rcu_read_lock();
1679 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1680 nfs4_clear_reclaim_server(server);
1681 rcu_read_unlock();
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001682
1683 nfs_delegation_reap_unclaimed(clp);
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001684 return 1;
1685}
1686
1687static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1688{
Trond Myklebust965e9c22013-05-20 11:05:17 -04001689 const struct nfs4_state_recovery_ops *ops;
1690 struct rpc_cred *cred;
1691
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001692 if (!nfs4_state_clear_reclaim_reboot(clp))
1693 return;
Trond Myklebust965e9c22013-05-20 11:05:17 -04001694 ops = clp->cl_mvops->reboot_recovery_ops;
Chuck Lever73d8bde2013-07-24 12:28:37 -04001695 cred = nfs4_get_clid_cred(clp);
Trond Myklebust965e9c22013-05-20 11:05:17 -04001696 nfs4_reclaim_complete(clp, ops, cred);
1697 put_rpccred(cred);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001698}
1699
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001700static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1701{
Trond Myklebust45870d62016-09-22 13:38:59 -04001702 nfs_mark_test_expired_all_delegations(clp);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001703 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1704}
1705
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001706static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
Trond Myklebuste598d842008-12-23 15:21:42 -05001707{
1708 switch (error) {
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001709 case 0:
1710 break;
Trond Myklebuste598d842008-12-23 15:21:42 -05001711 case -NFS4ERR_CB_PATH_DOWN:
Trond Myklebustad1e3962012-03-10 11:23:15 -05001712 nfs40_handle_cb_pathdown(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001713 break;
Trond Myklebustc8b7ae3d2009-12-03 15:53:21 -05001714 case -NFS4ERR_NO_GRACE:
1715 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001716 break;
Trond Myklebuste598d842008-12-23 15:21:42 -05001717 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebuste598d842008-12-23 15:21:42 -05001718 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001719 nfs4_state_clear_reclaim_reboot(clp);
Trond Myklebuste598d842008-12-23 15:21:42 -05001720 nfs4_state_start_reclaim_reboot(clp);
1721 break;
1722 case -NFS4ERR_EXPIRED:
1723 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1724 nfs4_state_start_reclaim_nograce(clp);
Andy Adamson8ba9bf82009-12-04 15:55:34 -05001725 break;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001726 case -NFS4ERR_BADSESSION:
1727 case -NFS4ERR_BADSLOT:
1728 case -NFS4ERR_BAD_HIGH_SLOT:
1729 case -NFS4ERR_DEADSESSION:
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001730 case -NFS4ERR_SEQ_FALSE_RETRY:
1731 case -NFS4ERR_SEQ_MISORDERED:
Andy Adamson6df08182009-12-04 15:55:05 -05001732 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
Andy Adamson0b9e2d42009-12-04 16:02:14 -05001733 /* Zero session reset errors */
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001734 break;
Trond Myklebust7c5d7252012-05-27 12:58:48 -04001735 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1736 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1737 break;
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001738 default:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001739 dprintk("%s: failed to handle error %d for server %s\n",
1740 __func__, error, clp->cl_hostname);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001741 return error;
Trond Myklebuste598d842008-12-23 15:21:42 -05001742 }
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001743 dprintk("%s: handled error %d for server %s\n", __func__, error,
1744 clp->cl_hostname);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001745 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001746}
1747
Trond Myklebust02860012008-12-23 15:21:40 -05001748static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749{
Chuck Lever24d292b2010-12-24 01:32:43 +00001750 struct nfs4_state_owner *sp;
1751 struct nfs_server *server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001752 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 int status = 0;
1754
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001755restart:
Chuck Lever24d292b2010-12-24 01:32:43 +00001756 rcu_read_lock();
1757 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
Chuck Lever0aaaf5c2011-12-06 16:13:48 -05001758 nfs4_purge_state_owners(server);
Chuck Lever24d292b2010-12-24 01:32:43 +00001759 spin_lock(&clp->cl_lock);
1760 for (pos = rb_first(&server->state_owners);
1761 pos != NULL;
1762 pos = rb_next(pos)) {
1763 sp = rb_entry(pos,
1764 struct nfs4_state_owner, so_server_node);
1765 if (!test_and_clear_bit(ops->owner_flag_bit,
1766 &sp->so_flags))
1767 continue;
Trond Myklebust4a0954e2015-10-02 11:11:16 -04001768 if (!atomic_inc_not_zero(&sp->so_count))
1769 continue;
Chuck Lever24d292b2010-12-24 01:32:43 +00001770 spin_unlock(&clp->cl_lock);
1771 rcu_read_unlock();
1772
1773 status = nfs4_reclaim_open_state(sp, ops);
1774 if (status < 0) {
1775 set_bit(ops->owner_flag_bit, &sp->so_flags);
1776 nfs4_put_state_owner(sp);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04001777 status = nfs4_recovery_handle_error(clp, status);
1778 return (status != 0) ? status : -EAGAIN;
Chuck Lever24d292b2010-12-24 01:32:43 +00001779 }
1780
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001781 nfs4_put_state_owner(sp);
Chuck Lever24d292b2010-12-24 01:32:43 +00001782 goto restart;
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001783 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001784 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001785 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001786 rcu_read_unlock();
Trond Myklebustdf817ba32014-09-27 17:41:51 -04001787 return 0;
Trond Myklebust02860012008-12-23 15:21:40 -05001788}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789
Trond Myklebust02860012008-12-23 15:21:40 -05001790static int nfs4_check_lease(struct nfs_client *clp)
1791{
1792 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001793 const struct nfs4_state_maintenance_ops *ops =
1794 clp->cl_mvops->state_renewal_ops;
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001795 int status;
Trond Myklebust02860012008-12-23 15:21:40 -05001796
Trond Myklebust0f605b52008-12-23 15:21:42 -05001797 /* Is the client already known to have an expired lease? */
1798 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1799 return 0;
Andy Adamsona7b72102009-04-01 09:22:46 -04001800 spin_lock(&clp->cl_lock);
1801 cred = ops->get_state_renewal_cred_locked(clp);
1802 spin_unlock(&clp->cl_lock);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001803 if (cred == NULL) {
Chuck Lever73d8bde2013-07-24 12:28:37 -04001804 cred = nfs4_get_clid_cred(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001805 status = -ENOKEY;
Trond Myklebust0f605b52008-12-23 15:21:42 -05001806 if (cred == NULL)
1807 goto out;
Trond Myklebust02860012008-12-23 15:21:40 -05001808 }
Benny Halevy8e69514f2009-04-01 09:22:45 -04001809 status = ops->renew_lease(clp, cred);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001810 put_rpccred(cred);
Trond Myklebustbc7a05c2013-04-08 17:50:28 -04001811 if (status == -ETIMEDOUT) {
1812 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1813 return 0;
1814 }
Trond Myklebust0f605b52008-12-23 15:21:42 -05001815out:
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001816 return nfs4_recovery_handle_error(clp, status);
Trond Myklebust02860012008-12-23 15:21:40 -05001817}
1818
Andy Adamson47b803c2012-10-01 20:42:32 -04001819/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1820 * and for recoverable errors on EXCHANGE_ID for v4.1
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001821 */
1822static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1823{
1824 switch (status) {
Trond Myklebust89a21732012-05-25 15:00:06 -04001825 case -NFS4ERR_SEQ_MISORDERED:
1826 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1827 return -ESERVERFAULT;
1828 /* Lease confirmation error: retry after purging the lease */
1829 ssleep(1);
Andy Adamson47b803c2012-10-01 20:42:32 -04001830 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1831 break;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001832 case -NFS4ERR_STALE_CLIENTID:
1833 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Andy Adamson47b803c2012-10-01 20:42:32 -04001834 nfs4_state_start_reclaim_reboot(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001835 break;
Chuck Leverde734832012-07-11 16:30:50 -04001836 case -NFS4ERR_CLID_INUSE:
1837 pr_err("NFS: Server %s reports our clientid is in use\n",
1838 clp->cl_hostname);
1839 nfs_mark_client_ready(clp, -EPERM);
1840 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1841 return -EPERM;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001842 case -EACCES:
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001843 case -NFS4ERR_DELAY:
1844 case -ETIMEDOUT:
1845 case -EAGAIN:
1846 ssleep(1);
1847 break;
1848
1849 case -NFS4ERR_MINOR_VERS_MISMATCH:
1850 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1851 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001852 dprintk("%s: exit with error %d for server %s\n",
1853 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001854 return -EPROTONOSUPPORT;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001855 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1856 * in nfs4_exchange_id */
1857 default:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001858 dprintk("%s: exit with error %d for server %s\n", __func__,
1859 status, clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001860 return status;
1861 }
1862 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001863 dprintk("%s: handled error %d for server %s\n", __func__, status,
1864 clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001865 return 0;
1866}
1867
Trond Myklebustb42353f2012-06-05 11:19:47 -04001868static int nfs4_establish_lease(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05001869{
1870 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001871 const struct nfs4_state_recovery_ops *ops =
1872 clp->cl_mvops->reboot_recovery_ops;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001873 int status;
Trond Myklebust02860012008-12-23 15:21:40 -05001874
Trond Myklebust5cae02f2015-06-01 10:30:11 -04001875 nfs4_begin_drain_session(clp);
Chuck Lever73d8bde2013-07-24 12:28:37 -04001876 cred = nfs4_get_clid_cred(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001877 if (cred == NULL)
1878 return -ENOENT;
1879 status = ops->establish_clid(clp, cred);
1880 put_rpccred(cred);
1881 if (status != 0)
Trond Myklebustb42353f2012-06-05 11:19:47 -04001882 return status;
1883 pnfs_destroy_all_layouts(clp);
1884 return 0;
1885}
1886
Chuck Lever6bbb4ae2012-07-11 16:30:59 -04001887/*
1888 * Returns zero or a negative errno. NFS4ERR values are converted
1889 * to local errno values.
1890 */
Trond Myklebustb42353f2012-06-05 11:19:47 -04001891static int nfs4_reclaim_lease(struct nfs_client *clp)
1892{
1893 int status;
1894
1895 status = nfs4_establish_lease(clp);
1896 if (status < 0)
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001897 return nfs4_handle_reclaim_lease_error(clp, status);
Trond Myklebustb42353f2012-06-05 11:19:47 -04001898 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1899 nfs4_state_start_reclaim_nograce(clp);
1900 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1901 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1902 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1903 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1904 return 0;
1905}
1906
1907static int nfs4_purge_lease(struct nfs_client *clp)
1908{
1909 int status;
1910
1911 status = nfs4_establish_lease(clp);
1912 if (status < 0)
1913 return nfs4_handle_reclaim_lease_error(clp, status);
1914 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1915 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1916 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001917 return 0;
Trond Myklebust02860012008-12-23 15:21:40 -05001918}
1919
Chuck Leverc9fdeb22013-10-17 14:13:02 -04001920/*
1921 * Try remote migration of one FSID from a source server to a
1922 * destination server. The source server provides a list of
1923 * potential destinations.
1924 *
1925 * Returns zero or a negative NFS4ERR status code.
1926 */
1927static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1928{
1929 struct nfs_client *clp = server->nfs_client;
1930 struct nfs4_fs_locations *locations = NULL;
1931 struct inode *inode;
1932 struct page *page;
1933 int status, result;
1934
1935 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1936 (unsigned long long)server->fsid.major,
1937 (unsigned long long)server->fsid.minor,
1938 clp->cl_hostname);
1939
1940 result = 0;
1941 page = alloc_page(GFP_KERNEL);
1942 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1943 if (page == NULL || locations == NULL) {
1944 dprintk("<-- %s: no memory\n", __func__);
1945 goto out;
1946 }
1947
David Howells2b0143b2015-03-17 22:25:59 +00001948 inode = d_inode(server->super->s_root);
Chuck Leverc9fdeb22013-10-17 14:13:02 -04001949 result = nfs4_proc_get_locations(inode, locations, page, cred);
1950 if (result) {
1951 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1952 __func__, result);
1953 goto out;
1954 }
1955
1956 result = -NFS4ERR_NXIO;
1957 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1958 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1959 __func__);
1960 goto out;
1961 }
1962
1963 nfs4_begin_drain_session(clp);
1964
1965 status = nfs4_replace_transport(server, locations);
1966 if (status != 0) {
1967 dprintk("<-- %s: failed to replace transport: %d\n",
1968 __func__, status);
1969 goto out;
1970 }
1971
1972 result = 0;
1973 dprintk("<-- %s: migration succeeded\n", __func__);
1974
1975out:
1976 if (page != NULL)
1977 __free_page(page);
1978 kfree(locations);
1979 if (result) {
1980 pr_err("NFS: migration recovery failed (server %s)\n",
1981 clp->cl_hostname);
1982 set_bit(NFS_MIG_FAILED, &server->mig_status);
1983 }
1984 return result;
1985}
1986
1987/*
1988 * Returns zero or a negative NFS4ERR status code.
1989 */
1990static int nfs4_handle_migration(struct nfs_client *clp)
1991{
1992 const struct nfs4_state_maintenance_ops *ops =
1993 clp->cl_mvops->state_renewal_ops;
1994 struct nfs_server *server;
1995 struct rpc_cred *cred;
1996
1997 dprintk("%s: migration reported on \"%s\"\n", __func__,
1998 clp->cl_hostname);
1999
2000 spin_lock(&clp->cl_lock);
2001 cred = ops->get_state_renewal_cred_locked(clp);
2002 spin_unlock(&clp->cl_lock);
2003 if (cred == NULL)
2004 return -NFS4ERR_NOENT;
2005
2006 clp->cl_mig_gen++;
2007restart:
2008 rcu_read_lock();
2009 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2010 int status;
2011
2012 if (server->mig_gen == clp->cl_mig_gen)
2013 continue;
2014 server->mig_gen = clp->cl_mig_gen;
2015
2016 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2017 &server->mig_status))
2018 continue;
2019
2020 rcu_read_unlock();
2021 status = nfs4_try_migration(server, cred);
2022 if (status < 0) {
2023 put_rpccred(cred);
2024 return status;
2025 }
2026 goto restart;
2027 }
2028 rcu_read_unlock();
2029 put_rpccred(cred);
2030 return 0;
2031}
2032
Chuck Leverb7f7a662013-10-17 14:13:35 -04002033/*
2034 * Test each nfs_server on the clp's cl_superblocks list to see
2035 * if it's moved to another server. Stop when the server no longer
2036 * returns NFS4ERR_LEASE_MOVED.
2037 */
2038static int nfs4_handle_lease_moved(struct nfs_client *clp)
2039{
2040 const struct nfs4_state_maintenance_ops *ops =
2041 clp->cl_mvops->state_renewal_ops;
2042 struct nfs_server *server;
2043 struct rpc_cred *cred;
2044
2045 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2046 clp->cl_hostname);
2047
2048 spin_lock(&clp->cl_lock);
2049 cred = ops->get_state_renewal_cred_locked(clp);
2050 spin_unlock(&clp->cl_lock);
2051 if (cred == NULL)
2052 return -NFS4ERR_NOENT;
2053
2054 clp->cl_mig_gen++;
2055restart:
2056 rcu_read_lock();
2057 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2058 struct inode *inode;
2059 int status;
2060
2061 if (server->mig_gen == clp->cl_mig_gen)
2062 continue;
2063 server->mig_gen = clp->cl_mig_gen;
2064
2065 rcu_read_unlock();
2066
David Howells2b0143b2015-03-17 22:25:59 +00002067 inode = d_inode(server->super->s_root);
Chuck Leverb7f7a662013-10-17 14:13:35 -04002068 status = nfs4_proc_fsid_present(inode, cred);
2069 if (status != -NFS4ERR_MOVED)
2070 goto restart; /* wasn't this one */
2071 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2072 goto restart; /* there are more */
2073 goto out;
2074 }
2075 rcu_read_unlock();
2076
2077out:
2078 put_rpccred(cred);
2079 return 0;
2080}
2081
Chuck Lever05f4c352012-09-14 17:24:32 -04002082/**
2083 * nfs4_discover_server_trunking - Detect server IP address trunking
2084 *
2085 * @clp: nfs_client under test
2086 * @result: OUT: found nfs_client, or clp
2087 *
2088 * Returns zero or a negative errno. If zero is returned,
2089 * an nfs_client pointer is planted in "result".
2090 *
2091 * Note: since we are invoked in process context, and
2092 * not from inside the state manager, we cannot use
2093 * nfs4_handle_reclaim_lease_error().
2094 */
2095int nfs4_discover_server_trunking(struct nfs_client *clp,
2096 struct nfs_client **result)
2097{
2098 const struct nfs4_state_recovery_ops *ops =
2099 clp->cl_mvops->reboot_recovery_ops;
Chuck Lever05f4c352012-09-14 17:24:32 -04002100 struct rpc_clnt *clnt;
2101 struct rpc_cred *cred;
Chuck Lever4edaa302013-03-16 15:56:20 -04002102 int i, status;
Chuck Lever05f4c352012-09-14 17:24:32 -04002103
2104 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2105
Chuck Lever05f4c352012-09-14 17:24:32 -04002106 clnt = clp->cl_rpcclient;
Chuck Lever05f4c352012-09-14 17:24:32 -04002107 i = 0;
2108
2109 mutex_lock(&nfs_clid_init_mutex);
Chuck Lever05f4c352012-09-14 17:24:32 -04002110again:
Trond Myklebustea33e6c2013-04-05 13:22:50 -04002111 status = -ENOENT;
Chuck Lever73d8bde2013-07-24 12:28:37 -04002112 cred = nfs4_get_clid_cred(clp);
Chuck Lever05f4c352012-09-14 17:24:32 -04002113 if (cred == NULL)
2114 goto out_unlock;
2115
2116 status = ops->detect_trunking(clp, result, cred);
2117 put_rpccred(cred);
2118 switch (status) {
2119 case 0:
2120 break;
Chuck Lever05f4c352012-09-14 17:24:32 -04002121 case -ETIMEDOUT:
Trond Myklebust150e7262014-03-18 14:23:11 -04002122 if (clnt->cl_softrtry)
2123 break;
2124 case -NFS4ERR_DELAY:
Chuck Lever05f4c352012-09-14 17:24:32 -04002125 case -EAGAIN:
2126 ssleep(1);
Trond Myklebust202c3122013-01-18 22:56:23 -05002127 case -NFS4ERR_STALE_CLIENTID:
Chuck Lever05f4c352012-09-14 17:24:32 -04002128 dprintk("NFS: %s after status %d, retrying\n",
2129 __func__, status);
2130 goto again;
Chuck Lever4edaa302013-03-16 15:56:20 -04002131 case -EACCES:
Chuck Leverd688f7b2013-07-24 12:28:28 -04002132 if (i++ == 0) {
2133 nfs4_root_machine_cred(clp);
2134 goto again;
2135 }
Jeff Layton6d769f12013-11-13 09:08:21 -05002136 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
Chuck Lever4edaa302013-03-16 15:56:20 -04002137 break;
Chuck Lever05f4c352012-09-14 17:24:32 -04002138 case -NFS4ERR_CLID_INUSE:
2139 case -NFS4ERR_WRONGSEC:
Jeff Layton6d769f12013-11-13 09:08:21 -05002140 /* No point in retrying if we already used RPC_AUTH_UNIX */
2141 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2142 status = -EPERM;
2143 break;
2144 }
Chuck Lever79d852b2013-04-22 15:42:48 -04002145 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
Chuck Lever05f4c352012-09-14 17:24:32 -04002146 if (IS_ERR(clnt)) {
2147 status = PTR_ERR(clnt);
2148 break;
2149 }
Trond Myklebustb193d592013-04-04 15:55:00 -04002150 /* Note: this is safe because we haven't yet marked the
2151 * client as ready, so we are the only user of
2152 * clp->cl_rpcclient
2153 */
2154 clnt = xchg(&clp->cl_rpcclient, clnt);
2155 rpc_shutdown_client(clnt);
2156 clnt = clp->cl_rpcclient;
Chuck Lever05f4c352012-09-14 17:24:32 -04002157 goto again;
2158
2159 case -NFS4ERR_MINOR_VERS_MISMATCH:
2160 status = -EPROTONOSUPPORT;
2161 break;
2162
2163 case -EKEYEXPIRED:
Chuck Lever05f4c352012-09-14 17:24:32 -04002164 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2165 * in nfs4_exchange_id */
2166 status = -EKEYEXPIRED;
Trond Myklebustea33e6c2013-04-05 13:22:50 -04002167 break;
2168 default:
2169 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2170 __func__, status);
2171 status = -EIO;
Chuck Lever05f4c352012-09-14 17:24:32 -04002172 }
2173
2174out_unlock:
2175 mutex_unlock(&nfs_clid_init_mutex);
Chuck Lever05f4c352012-09-14 17:24:32 -04002176 dprintk("NFS: %s: status = %d\n", __func__, status);
2177 return status;
2178}
2179
Andy Adamson76db6d92009-04-01 09:22:38 -04002180#ifdef CONFIG_NFS_V4_1
Trond Myklebust9f594792012-05-27 13:02:53 -04002181void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002182{
Trond Myklebust444f72f2011-05-26 14:26:35 -04002183 struct nfs_client *clp = session->clp;
2184
Trond Myklebust9f594792012-05-27 13:02:53 -04002185 switch (err) {
2186 default:
2187 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2188 break;
2189 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2190 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2191 }
Trond Myklebust444f72f2011-05-26 14:26:35 -04002192 nfs4_schedule_lease_recovery(clp);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002193}
Andy Adamsoncbdabc7f2011-03-01 01:34:20 +00002194EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002195
Anna Schumaker3f10a6a2015-07-13 14:01:31 -04002196void nfs41_notify_server(struct nfs_client *clp)
Trond Myklebustac074832012-11-21 09:06:11 -05002197{
2198 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2199 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2200 nfs4_schedule_state_manager(clp);
2201}
2202
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002203static void nfs4_reset_all_state(struct nfs_client *clp)
2204{
2205 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
Chuck Lever2c820d92012-05-21 22:45:33 -04002206 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
Trond Myklebustbe0bfed2012-05-25 16:02:15 -04002207 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002208 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002209 dprintk("%s: scheduling reset of all state for server %s!\n",
2210 __func__, clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002211 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002212 }
2213}
2214
2215static void nfs41_handle_server_reboot(struct nfs_client *clp)
2216{
2217 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2218 nfs4_state_start_reclaim_reboot(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002219 dprintk("%s: server %s rebooted!\n", __func__,
2220 clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002221 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002222 }
2223}
2224
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002225static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002226{
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002227 nfs4_reset_all_state(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002228 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002229}
2230
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002231static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2232{
Trond Myklebust45870d62016-09-22 13:38:59 -04002233 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002234 nfs4_schedule_state_manager(clp);
2235
2236 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2237}
2238
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002239static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2240{
Trond Myklebust40992872015-07-05 15:20:53 -04002241 /* FIXME: For now, we destroy all layouts. */
2242 pnfs_destroy_all_layouts(clp);
2243 /* FIXME: For now, we test all delegations+open state+locks. */
2244 nfs41_handle_some_state_revoked(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002245 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2246 clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002247}
2248
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002249static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002250{
Trond Myklebustb1352902015-07-05 15:26:58 -04002251 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2252 nfs4_schedule_state_manager(clp);
2253
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002254 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2255 clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002256}
2257
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002258static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2259{
2260 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2261 &clp->cl_state) == 0)
2262 nfs4_schedule_state_manager(clp);
2263}
2264
Trond Myklebust0a014a42016-09-22 13:38:51 -04002265void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2266 bool recovery)
Alexandros Batsakis0629e372009-12-05 13:46:14 -05002267{
2268 if (!flags)
2269 return;
Chuck Lever2c820d92012-05-21 22:45:33 -04002270
2271 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2272 __func__, clp->cl_hostname, clp->cl_clientid, flags);
Trond Myklebust0a014a42016-09-22 13:38:51 -04002273 /*
2274 * If we're called from the state manager thread, then assume we're
2275 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2276 * Those flags are expected to remain set until we're done
2277 * recovering (see RFC5661, section 18.46.3).
2278 */
2279 if (recovery)
2280 goto out_recovery;
Chuck Lever2c820d92012-05-21 22:45:33 -04002281
Trond Myklebust111d4892011-12-01 16:37:42 -05002282 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002283 nfs41_handle_server_reboot(clp);
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002284 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2285 nfs41_handle_all_state_revoked(clp);
2286 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
Chuck Leverd1c23312013-10-17 14:13:58 -04002287 SEQ4_STATUS_ADMIN_STATE_REVOKED))
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002288 nfs41_handle_some_state_revoked(clp);
Chuck Leverd1c23312013-10-17 14:13:58 -04002289 if (flags & SEQ4_STATUS_LEASE_MOVED)
2290 nfs4_schedule_lease_moved_recovery(clp);
Trond Myklebust111d4892011-12-01 16:37:42 -05002291 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002292 nfs41_handle_recallable_state_revoked(clp);
Trond Myklebust0a014a42016-09-22 13:38:51 -04002293out_recovery:
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002294 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2295 nfs41_handle_backchannel_fault(clp);
2296 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2297 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002298 nfs41_handle_cb_path_down(clp);
Alexandros Batsakis0629e372009-12-05 13:46:14 -05002299}
2300
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002301static int nfs4_reset_session(struct nfs_client *clp)
2302{
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002303 struct rpc_cred *cred;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002304 int status;
2305
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002306 if (!nfs4_has_session(clp))
2307 return 0;
Trond Myklebust38045412009-12-15 17:36:57 -05002308 nfs4_begin_drain_session(clp);
Chuck Lever73d8bde2013-07-24 12:28:37 -04002309 cred = nfs4_get_clid_cred(clp);
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002310 status = nfs4_proc_destroy_session(clp->cl_session, cred);
Trond Myklebustc489ee22013-01-30 13:04:10 -05002311 switch (status) {
2312 case 0:
2313 case -NFS4ERR_BADSESSION:
2314 case -NFS4ERR_DEADSESSION:
2315 break;
2316 case -NFS4ERR_BACK_CHAN_BUSY:
2317 case -NFS4ERR_DELAY:
2318 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2319 status = 0;
2320 ssleep(1);
2321 goto out;
2322 default:
Ricardo Labiagaf4558482009-12-07 09:16:09 -05002323 status = nfs4_recovery_handle_error(clp, status);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002324 goto out;
2325 }
2326
2327 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002328 status = nfs4_proc_create_session(clp, cred);
Andy Adamson41f54a52010-01-21 14:54:13 -05002329 if (status) {
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002330 dprintk("%s: session reset failed with status %d for server %s!\n",
2331 __func__, status, clp->cl_hostname);
Trond Myklebustf2c1b512012-05-27 14:46:46 -04002332 status = nfs4_handle_reclaim_lease_error(clp, status);
Andy Adamson41f54a52010-01-21 14:54:13 -05002333 goto out;
2334 }
Trond Myklebustbda197f2012-06-05 10:22:14 -04002335 nfs41_finish_session_reset(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002336 dprintk("%s: session reset was successful for server %s!\n",
2337 __func__, clp->cl_hostname);
Andy Adamson41f54a52010-01-21 14:54:13 -05002338out:
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002339 if (cred)
2340 put_rpccred(cred);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002341 return status;
2342}
Andy Adamson76db6d92009-04-01 09:22:38 -04002343
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002344static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2345{
Trond Myklebust2cf047c2012-05-25 17:57:41 -04002346 struct rpc_cred *cred;
2347 int ret;
2348
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002349 if (!nfs4_has_session(clp))
2350 return 0;
Trond Myklebust43ac5442012-05-27 13:47:21 -04002351 nfs4_begin_drain_session(clp);
Chuck Lever73d8bde2013-07-24 12:28:37 -04002352 cred = nfs4_get_clid_cred(clp);
Trond Myklebust2cf047c2012-05-25 17:57:41 -04002353 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2354 if (cred)
2355 put_rpccred(cred);
Trond Myklebust43ac5442012-05-27 13:47:21 -04002356 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
Trond Myklebustbf674c82012-05-27 12:53:10 -04002357 switch (ret) {
2358 case 0:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002359 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2360 __func__, clp->cl_hostname);
Trond Myklebustbf674c82012-05-27 12:53:10 -04002361 break;
2362 case -NFS4ERR_DELAY:
2363 ssleep(1);
2364 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2365 break;
2366 default:
2367 return nfs4_recovery_handle_error(clp, ret);
2368 }
2369 return 0;
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002370}
Andy Adamson76db6d92009-04-01 09:22:38 -04002371#else /* CONFIG_NFS_V4_1 */
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002372static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002373
2374static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2375{
2376 return 0;
2377}
Andy Adamson76db6d92009-04-01 09:22:38 -04002378#endif /* CONFIG_NFS_V4_1 */
2379
Trond Myklebuste005e802008-12-23 15:21:48 -05002380static void nfs4_state_manager(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05002381{
Trond Myklebust02860012008-12-23 15:21:40 -05002382 int status = 0;
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002383 const char *section = "", *section_sep = "";
Trond Myklebust02860012008-12-23 15:21:40 -05002384
Trond Myklebust02860012008-12-23 15:21:40 -05002385 /* Ensure exclusive access to NFSv4 state */
Trond Myklebust47c21992011-04-15 17:34:18 -04002386 do {
Chuck Lever2c820d92012-05-21 22:45:33 -04002387 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002388 section = "purge state";
Trond Myklebustb42353f2012-06-05 11:19:47 -04002389 status = nfs4_purge_lease(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04002390 if (status < 0)
2391 goto out_error;
Trond Myklebustb42353f2012-06-05 11:19:47 -04002392 continue;
Chuck Lever2c820d92012-05-21 22:45:33 -04002393 }
2394
Trond Myklebustb42353f2012-06-05 11:19:47 -04002395 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002396 section = "lease expired";
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002397 /* We're going to have to re-establish a clientid */
2398 status = nfs4_reclaim_lease(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04002399 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002400 goto out_error;
Trond Myklebustb42353f2012-06-05 11:19:47 -04002401 continue;
Trond Myklebuste598d842008-12-23 15:21:42 -05002402 }
2403
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002404 /* Initialize or reset the session */
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002405 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002406 section = "reset session";
Andy Adamson4d643d12009-12-04 15:52:24 -05002407 status = nfs4_reset_session(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002408 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2409 continue;
2410 if (status < 0)
Andy Adamson76db6d92009-04-01 09:22:38 -04002411 goto out_error;
Andy Adamson76db6d92009-04-01 09:22:38 -04002412 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002413
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002414 /* Send BIND_CONN_TO_SESSION */
2415 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002416 &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002417 section = "bind conn to session";
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002418 status = nfs4_bind_conn_to_session(clp);
2419 if (status < 0)
2420 goto out_error;
Trond Myklebustbf674c82012-05-27 12:53:10 -04002421 continue;
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002422 }
2423
Trond Myklebust5df904a2012-11-21 09:22:14 -05002424 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2425 section = "check lease";
2426 status = nfs4_check_lease(clp);
2427 if (status < 0)
2428 goto out_error;
Olga Kornievskaia8faaa6d2014-09-24 18:11:28 -04002429 continue;
Chuck Leverc9fdeb22013-10-17 14:13:02 -04002430 }
2431
2432 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2433 section = "migration";
2434 status = nfs4_handle_migration(clp);
2435 if (status < 0)
2436 goto out_error;
Trond Myklebust5df904a2012-11-21 09:22:14 -05002437 }
2438
Chuck Leverb7f7a662013-10-17 14:13:35 -04002439 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2440 section = "lease moved";
2441 status = nfs4_handle_lease_moved(clp);
2442 if (status < 0)
2443 goto out_error;
2444 }
2445
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002446 /* First recover reboot state... */
Trond Myklebuste345e882009-12-03 15:52:41 -05002447 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002448 section = "reclaim reboot";
Andy Adamson591d71c2009-04-01 09:22:47 -04002449 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04002450 clp->cl_mvops->reboot_recovery_ops);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002451 if (status == -EAGAIN)
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002452 continue;
2453 if (status < 0)
2454 goto out_error;
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002455 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002456 }
2457
Trond Myklebust45870d62016-09-22 13:38:59 -04002458 /* Detect expired delegations... */
2459 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2460 section = "detect expired delegations";
2461 nfs_reap_expired_delegations(clp);
2462 continue;
2463 }
2464
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002465 /* Now recover expired state... */
2466 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002467 section = "reclaim nograce";
Andy Adamson591d71c2009-04-01 09:22:47 -04002468 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04002469 clp->cl_mvops->nograce_recovery_ops);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002470 if (status == -EAGAIN)
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002471 continue;
2472 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002473 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002474 }
Trond Myklebust707fb4b2008-12-23 15:21:47 -05002475
Alexandros Batsakis5601a002009-12-14 21:27:58 -08002476 nfs4_end_drain_session(clp);
Trond Myklebust707fb4b2008-12-23 15:21:47 -05002477 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2478 nfs_client_return_marked_delegations(clp);
2479 continue;
2480 }
Trond Myklebuste005e802008-12-23 15:21:48 -05002481
2482 nfs4_clear_state_manager_bit(clp);
Trond Myklebustf3c76492008-12-23 15:21:48 -05002483 /* Did we race with an attempt to give us more work? */
2484 if (clp->cl_state == 0)
2485 break;
2486 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2487 break;
Trond Myklebust47c21992011-04-15 17:34:18 -04002488 } while (atomic_read(&clp->cl_count) > 1);
Trond Myklebuste005e802008-12-23 15:21:48 -05002489 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490out_error:
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002491 if (strlen(section))
2492 section_sep = ": ";
2493 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2494 " with error %d\n", section_sep, section,
2495 clp->cl_hostname, -status);
Chuck Leverffe5a832012-09-14 17:23:23 -04002496 ssleep(1);
Alexandros Batsakis5601a002009-12-14 21:27:58 -08002497 nfs4_end_drain_session(clp);
Trond Myklebuste005e802008-12-23 15:21:48 -05002498 nfs4_clear_state_manager_bit(clp);
2499}
2500
2501static int nfs4_run_state_manager(void *ptr)
2502{
2503 struct nfs_client *clp = ptr;
2504
2505 allow_signal(SIGKILL);
2506 nfs4_state_manager(clp);
2507 nfs_put_client(clp);
2508 module_put_and_exit(0);
2509 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002510}
2511
2512/*
2513 * Local variables:
2514 * c-basic-offset: 8
2515 * End:
2516 */