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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/nfs/nfs4renewd.c
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 * Implementation of the NFSv4 "renew daemon", which wakes up periodically to
35 * send a RENEW, to keep state alive on the server. The daemon is implemented
36 * as an rpc_task, not a real kernel thread, so it always runs in rpciod's
37 * context. There is one renewd per nfs_server.
38 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 */
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/mm.h>
42#include <linux/pagemap.h>
43#include <linux/sunrpc/sched.h>
44#include <linux/sunrpc/clnt.h>
45
46#include <linux/nfs.h>
47#include <linux/nfs4.h>
48#include <linux/nfs_fs.h>
Trond Myklebust4ce79712005-06-22 17:16:21 +000049#include "nfs4_fs.h"
Trond Myklebust58d97142006-01-03 09:55:24 +010050#include "delegation.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Chuck Levere3c0fb72012-05-21 22:45:24 -040052#define NFSDBG_FACILITY NFSDBG_STATE
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54void
David Howells65f27f32006-11-22 14:55:48 +000055nfs4_renew_state(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Trond Myklebustc48f4f32010-06-16 09:52:27 -040057 const struct nfs4_state_maintenance_ops *ops;
David Howells65f27f32006-11-22 14:55:48 +000058 struct nfs_client *clp =
59 container_of(work, struct nfs_client, cl_renewd.work);
Trond Myklebustb4454fe2006-01-03 09:55:25 +010060 struct rpc_cred *cred;
Alexandros Batsakisdc96aef2010-02-05 03:45:04 -080061 long lease;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 unsigned long last, now;
Trond Myklebust2f60ea62011-08-24 15:07:37 -040063 unsigned renew_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Trond Myklebustc48f4f32010-06-16 09:52:27 -040065 ops = clp->cl_mvops->state_renewal_ops;
Harvey Harrison3110ff82008-05-02 13:42:44 -070066 dprintk("%s: start\n", __func__);
Chuck Leverfca52382010-12-24 01:32:32 +000067
Andy Adamsond3b4c9d2011-03-01 01:34:10 +000068 if (test_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state))
Trond Myklebust58d97142006-01-03 09:55:24 +010069 goto out;
Chuck Leverfca52382010-12-24 01:32:32 +000070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 spin_lock(&clp->cl_lock);
72 lease = clp->cl_lease_time;
73 last = clp->cl_last_renewal;
74 now = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 /* Are we close to a lease timeout? */
Trond Myklebust2f60ea62011-08-24 15:07:37 -040076 if (time_after(now, last + lease/3))
77 renew_flags |= NFS4_RENEW_TIMEOUT;
78 if (nfs_delegations_present(clp))
79 renew_flags |= NFS4_RENEW_DELEGATION_CB;
80
81 if (renew_flags != 0) {
Andy Adamsona7b72102009-04-01 09:22:46 -040082 cred = ops->get_state_renewal_cred_locked(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 spin_unlock(&clp->cl_lock);
Trond Myklebustb0d3ded2008-12-23 15:21:50 -050084 if (cred == NULL) {
Trond Myklebust2f60ea62011-08-24 15:07:37 -040085 if (!(renew_flags & NFS4_RENEW_DELEGATION_CB)) {
Trond Myklebustb0d3ded2008-12-23 15:21:50 -050086 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
87 goto out;
88 }
89 nfs_expire_all_delegations(clp);
90 } else {
Andy Adamsond1f456b2014-09-29 12:31:57 -040091 int ret;
92
Trond Myklebustb0d3ded2008-12-23 15:21:50 -050093 /* Queue an asynchronous RENEW. */
Andy Adamsond1f456b2014-09-29 12:31:57 -040094 ret = ops->sched_state_renewal(clp, cred, renew_flags);
Trond Myklebustb0d3ded2008-12-23 15:21:50 -050095 put_rpccred(cred);
Andy Adamsond1f456b2014-09-29 12:31:57 -040096 switch (ret) {
97 default:
98 goto out_exp;
99 case -EAGAIN:
100 case -ENOMEM:
101 break;
102 }
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500103 }
Alexandros Batsakisdc96aef2010-02-05 03:45:04 -0800104 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 dprintk("%s: failed to call renewd. Reason: lease not expired \n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700106 __func__);
Alexandros Batsakisdc96aef2010-02-05 03:45:04 -0800107 spin_unlock(&clp->cl_lock);
108 }
109 nfs4_schedule_state_renewal(clp);
110out_exp:
Trond Myklebustb7391f42008-12-23 15:21:52 -0500111 nfs_expire_unreferenced_delegations(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700113 dprintk("%s: done\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116void
David Howellsadfa6f92006-08-22 20:06:08 -0400117nfs4_schedule_state_renewal(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
119 long timeout;
120
121 spin_lock(&clp->cl_lock);
122 timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal
123 - (long)jiffies;
124 if (timeout < 5 * HZ)
125 timeout = 5 * HZ;
126 dprintk("%s: requeueing work. Lease period = %ld\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700127 __func__, (timeout + HZ - 1) / HZ);
Tejun Heo41f63c52012-08-03 10:30:47 -0700128 mod_delayed_work(system_wq, &clp->cl_renewd, timeout);
Trond Myklebust5dd31772006-08-24 01:03:05 -0400129 set_bit(NFS_CS_RENEWD, &clp->cl_res_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 spin_unlock(&clp->cl_lock);
131}
132
133void
David Howellsadfa6f92006-08-22 20:06:08 -0400134nfs4_kill_renewd(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Trond Myklebust3d39c692007-08-07 15:28:33 -0400136 cancel_delayed_work_sync(&clp->cl_renewd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
139/*
140 * Local variables:
141 * c-basic-offset: 8
142 * End:
143 */