]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - fs/nfs/nfs4renewd.c
NFSv4: The NFSv4.0 client must send RENEW calls if it holds a delegation
[mirror_ubuntu-artful-kernel.git] / fs / nfs / nfs4renewd.c
CommitLineData
1da177e4
LT
1/*
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 *
1da177e4
LT
39 */
40
1da177e4
LT
41#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>
4ce79717 49#include "nfs4_fs.h"
58d9714a 50#include "delegation.h"
1da177e4
LT
51
52#define NFSDBG_FACILITY NFSDBG_PROC
53
54void
65f27f38 55nfs4_renew_state(struct work_struct *work)
1da177e4 56{
c48f4f35 57 const struct nfs4_state_maintenance_ops *ops;
65f27f38
DH
58 struct nfs_client *clp =
59 container_of(work, struct nfs_client, cl_renewd.work);
b4454fe1 60 struct rpc_cred *cred;
dc96aef9 61 long lease;
1da177e4 62 unsigned long last, now;
2f60ea6b 63 unsigned renew_flags = 0;
1da177e4 64
c48f4f35 65 ops = clp->cl_mvops->state_renewal_ops;
3110ff80 66 dprintk("%s: start\n", __func__);
fca5238e 67
d3b4c9d7 68 if (test_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state))
58d9714a 69 goto out;
fca5238e 70
1da177e4
LT
71 spin_lock(&clp->cl_lock);
72 lease = clp->cl_lease_time;
73 last = clp->cl_last_renewal;
74 now = jiffies;
1da177e4 75 /* Are we close to a lease timeout? */
2f60ea6b
TM
76 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) {
a7b72103 82 cred = ops->get_state_renewal_cred_locked(clp);
b0d3ded1 83 spin_unlock(&clp->cl_lock);
b4454fe1 84 if (cred == NULL) {
2f60ea6b 85 if (!(renew_flags & NFS4_RENEW_DELEGATION_CB)) {
b0d3ded1
TM
86 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
87 goto out;
88 }
58d9714a 89 nfs_expire_all_delegations(clp);
b0d3ded1
TM
90 } else {
91 /* Queue an asynchronous RENEW. */
2f60ea6b 92 ops->sched_state_renewal(clp, cred, renew_flags);
b0d3ded1 93 put_rpccred(cred);
dc96aef9 94 goto out_exp;
58d9714a 95 }
dc96aef9 96 } else {
1da177e4 97 dprintk("%s: failed to call renewd. Reason: lease not expired \n",
3110ff80 98 __func__);
dc96aef9
AB
99 spin_unlock(&clp->cl_lock);
100 }
101 nfs4_schedule_state_renewal(clp);
102out_exp:
b7391f44 103 nfs_expire_unreferenced_delegations(clp);
1da177e4 104out:
3110ff80 105 dprintk("%s: done\n", __func__);
1da177e4
LT
106}
107
1da177e4 108void
adfa6f98 109nfs4_schedule_state_renewal(struct nfs_client *clp)
1da177e4
LT
110{
111 long timeout;
112
113 spin_lock(&clp->cl_lock);
114 timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal
115 - (long)jiffies;
116 if (timeout < 5 * HZ)
117 timeout = 5 * HZ;
118 dprintk("%s: requeueing work. Lease period = %ld\n",
3110ff80 119 __func__, (timeout + HZ - 1) / HZ);
1da177e4
LT
120 cancel_delayed_work(&clp->cl_renewd);
121 schedule_delayed_work(&clp->cl_renewd, timeout);
5dd3177a 122 set_bit(NFS_CS_RENEWD, &clp->cl_res_state);
1da177e4
LT
123 spin_unlock(&clp->cl_lock);
124}
125
1da177e4 126void
adfa6f98 127nfs4_kill_renewd(struct nfs_client *clp)
1da177e4 128{
3d39c691 129 cancel_delayed_work_sync(&clp->cl_renewd);
1da177e4
LT
130}
131
132/*
133 * Local variables:
134 * c-basic-offset: 8
135 * End:
136 */