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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 | ||
54 | void | |
65f27f38 | 55 | nfs4_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 LT |
62 | unsigned long last, now; |
63 | ||
c48f4f35 | 64 | ops = clp->cl_mvops->state_renewal_ops; |
3110ff80 | 65 | dprintk("%s: start\n", __func__); |
1da177e4 LT |
66 | /* Are there any active superblocks? */ |
67 | if (list_empty(&clp->cl_superblocks)) | |
58d9714a | 68 | goto out; |
1da177e4 LT |
69 | spin_lock(&clp->cl_lock); |
70 | lease = clp->cl_lease_time; | |
71 | last = clp->cl_last_renewal; | |
72 | now = jiffies; | |
1da177e4 LT |
73 | /* Are we close to a lease timeout? */ |
74 | if (time_after(now, last + lease/3)) { | |
a7b72103 | 75 | cred = ops->get_state_renewal_cred_locked(clp); |
b0d3ded1 | 76 | spin_unlock(&clp->cl_lock); |
b4454fe1 | 77 | if (cred == NULL) { |
b0d3ded1 TM |
78 | if (list_empty(&clp->cl_delegations)) { |
79 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
80 | goto out; | |
81 | } | |
58d9714a | 82 | nfs_expire_all_delegations(clp); |
b0d3ded1 TM |
83 | } else { |
84 | /* Queue an asynchronous RENEW. */ | |
29fba38b | 85 | ops->sched_state_renewal(clp, cred); |
b0d3ded1 | 86 | put_rpccred(cred); |
dc96aef9 | 87 | goto out_exp; |
58d9714a | 88 | } |
dc96aef9 | 89 | } else { |
1da177e4 | 90 | dprintk("%s: failed to call renewd. Reason: lease not expired \n", |
3110ff80 | 91 | __func__); |
dc96aef9 AB |
92 | spin_unlock(&clp->cl_lock); |
93 | } | |
94 | nfs4_schedule_state_renewal(clp); | |
95 | out_exp: | |
b7391f44 | 96 | nfs_expire_unreferenced_delegations(clp); |
1da177e4 | 97 | out: |
3110ff80 | 98 | dprintk("%s: done\n", __func__); |
1da177e4 LT |
99 | } |
100 | ||
1da177e4 | 101 | void |
adfa6f98 | 102 | nfs4_schedule_state_renewal(struct nfs_client *clp) |
1da177e4 LT |
103 | { |
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", | |
3110ff80 | 112 | __func__, (timeout + HZ - 1) / HZ); |
1da177e4 LT |
113 | cancel_delayed_work(&clp->cl_renewd); |
114 | schedule_delayed_work(&clp->cl_renewd, timeout); | |
5dd3177a | 115 | set_bit(NFS_CS_RENEWD, &clp->cl_res_state); |
1da177e4 LT |
116 | spin_unlock(&clp->cl_lock); |
117 | } | |
118 | ||
1da177e4 | 119 | void |
adfa6f98 | 120 | nfs4_kill_renewd(struct nfs_client *clp) |
1da177e4 | 121 | { |
3d39c691 | 122 | cancel_delayed_work_sync(&clp->cl_renewd); |
1da177e4 LT |
123 | } |
124 | ||
125 | /* | |
126 | * Local variables: | |
127 | * c-basic-offset: 8 | |
128 | * End: | |
129 | */ |