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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 *
39 * TODO: If the send queue gets backlogged (e.g., if the server goes down),
40 * we will keep filling the queue with periodic RENEW requests. We need a
41 * mechanism for ensuring that if renewd successfully sends off a request,
42 * then it only wakes up when the request is finished. Maybe use the
43 * child task framework of the RPC layer?
44 */
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/mm.h>
47#include <linux/pagemap.h>
48#include <linux/sunrpc/sched.h>
49#include <linux/sunrpc/clnt.h>
50
51#include <linux/nfs.h>
52#include <linux/nfs4.h>
53#include <linux/nfs_fs.h>
Trond Myklebust4ce79712005-06-22 17:16:21 +000054#include "nfs4_fs.h"
Trond Myklebust58d97142006-01-03 09:55:24 +010055#include "delegation.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57#define NFSDBG_FACILITY NFSDBG_PROC
58
59void
David Howells65f27f32006-11-22 14:55:48 +000060nfs4_renew_state(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
David Howells65f27f32006-11-22 14:55:48 +000062 struct nfs_client *clp =
63 container_of(work, struct nfs_client, cl_renewd.work);
Trond Myklebustb4454fe2006-01-03 09:55:25 +010064 struct rpc_cred *cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 long lease, timeout;
66 unsigned long last, now;
67
Harvey Harrison3110ff82008-05-02 13:42:44 -070068 dprintk("%s: start\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 /* Are there any active superblocks? */
70 if (list_empty(&clp->cl_superblocks))
Trond Myklebust58d97142006-01-03 09:55:24 +010071 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 spin_lock(&clp->cl_lock);
73 lease = clp->cl_lease_time;
74 last = clp->cl_last_renewal;
75 now = jiffies;
76 timeout = (2 * lease) / 3 + (long)last - (long)now;
77 /* Are we close to a lease timeout? */
78 if (time_after(now, last + lease/3)) {
Trond Myklebust6dc9d572008-12-23 15:21:41 -050079 cred = nfs4_get_renew_cred_locked(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 spin_unlock(&clp->cl_lock);
Trond Myklebustb0d3ded2008-12-23 15:21:50 -050081 if (cred == NULL) {
82 if (list_empty(&clp->cl_delegations)) {
83 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
84 goto out;
85 }
86 nfs_expire_all_delegations(clp);
87 } else {
88 /* Queue an asynchronous RENEW. */
89 nfs4_proc_async_renew(clp, cred);
90 put_rpccred(cred);
91 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 timeout = (2 * lease) / 3;
93 spin_lock(&clp->cl_lock);
94 } else
95 dprintk("%s: failed to call renewd. Reason: lease not expired \n",
Harvey Harrison3110ff82008-05-02 13:42:44 -070096 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 if (timeout < 5 * HZ) /* safeguard */
98 timeout = 5 * HZ;
99 dprintk("%s: requeueing work. Lease period = %ld\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700100 __func__, (timeout + HZ - 1) / HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 cancel_delayed_work(&clp->cl_renewd);
102 schedule_delayed_work(&clp->cl_renewd, timeout);
103 spin_unlock(&clp->cl_lock);
Trond Myklebustb7391f42008-12-23 15:21:52 -0500104 nfs_expire_unreferenced_delegations(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700106 dprintk("%s: done\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109void
David Howellsadfa6f92006-08-22 20:06:08 -0400110nfs4_schedule_state_renewal(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
112 long timeout;
113
114 spin_lock(&clp->cl_lock);
115 timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal
116 - (long)jiffies;
117 if (timeout < 5 * HZ)
118 timeout = 5 * HZ;
119 dprintk("%s: requeueing work. Lease period = %ld\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700120 __func__, (timeout + HZ - 1) / HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 cancel_delayed_work(&clp->cl_renewd);
122 schedule_delayed_work(&clp->cl_renewd, timeout);
Trond Myklebust5dd31772006-08-24 01:03:05 -0400123 set_bit(NFS_CS_RENEWD, &clp->cl_res_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 spin_unlock(&clp->cl_lock);
125}
126
127void
128nfs4_renewd_prepare_shutdown(struct nfs_server *server)
129{
Trond Myklebust3d39c692007-08-07 15:28:33 -0400130 cancel_delayed_work(&server->nfs_client->cl_renewd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131}
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133void
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 */