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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
52#define NFSDBG_FACILITY NFSDBG_PROC
53
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;
63
Trond Myklebustc48f4f32010-06-16 09:52:27 -040064 ops = clp->cl_mvops->state_renewal_ops;
Harvey Harrison3110ff82008-05-02 13:42:44 -070065 dprintk("%s: start\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 /* Are there any active superblocks? */
67 if (list_empty(&clp->cl_superblocks))
Trond Myklebust58d97142006-01-03 09:55:24 +010068 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 spin_lock(&clp->cl_lock);
70 lease = clp->cl_lease_time;
71 last = clp->cl_last_renewal;
72 now = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 /* Are we close to a lease timeout? */
74 if (time_after(now, last + lease/3)) {
Andy Adamsona7b72102009-04-01 09:22:46 -040075 cred = ops->get_state_renewal_cred_locked(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 spin_unlock(&clp->cl_lock);
Trond Myklebustb0d3ded2008-12-23 15:21:50 -050077 if (cred == NULL) {
78 if (list_empty(&clp->cl_delegations)) {
79 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
80 goto out;
81 }
82 nfs_expire_all_delegations(clp);
83 } else {
84 /* Queue an asynchronous RENEW. */
Benny Halevy29fba382009-04-01 09:22:44 -040085 ops->sched_state_renewal(clp, cred);
Trond Myklebustb0d3ded2008-12-23 15:21:50 -050086 put_rpccred(cred);
Alexandros Batsakisdc96aef2010-02-05 03:45:04 -080087 goto out_exp;
Trond Myklebustb0d3ded2008-12-23 15:21:50 -050088 }
Alexandros Batsakisdc96aef2010-02-05 03:45:04 -080089 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 dprintk("%s: failed to call renewd. Reason: lease not expired \n",
Harvey Harrison3110ff82008-05-02 13:42:44 -070091 __func__);
Alexandros Batsakisdc96aef2010-02-05 03:45:04 -080092 spin_unlock(&clp->cl_lock);
93 }
94 nfs4_schedule_state_renewal(clp);
95out_exp:
Trond Myklebustb7391f42008-12-23 15:21:52 -050096 nfs_expire_unreferenced_delegations(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097out:
Harvey Harrison3110ff82008-05-02 13:42:44 -070098 dprintk("%s: done\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101void
David Howellsadfa6f92006-08-22 20:06:08 -0400102nfs4_schedule_state_renewal(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
104 long timeout;
105
106 spin_lock(&clp->cl_lock);
107 timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal
108 - (long)jiffies;
109 if (timeout < 5 * HZ)
110 timeout = 5 * HZ;
111 dprintk("%s: requeueing work. Lease period = %ld\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700112 __func__, (timeout + HZ - 1) / HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 cancel_delayed_work(&clp->cl_renewd);
114 schedule_delayed_work(&clp->cl_renewd, timeout);
Trond Myklebust5dd31772006-08-24 01:03:05 -0400115 set_bit(NFS_CS_RENEWD, &clp->cl_res_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 spin_unlock(&clp->cl_lock);
117}
118
119void
David Howellsadfa6f92006-08-22 20:06:08 -0400120nfs4_kill_renewd(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
Trond Myklebust3d39c692007-08-07 15:28:33 -0400122 cancel_delayed_work_sync(&clp->cl_renewd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
125/*
126 * Local variables:
127 * c-basic-offset: 8
128 * End:
129 */