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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 | * |
39 | */ |
40 | |
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> |
49 | #include "nfs4_fs.h" |
50 | #include "delegation.h" |
51 | |
52 | #define NFSDBG_FACILITY NFSDBG_PROC |
53 | |
54 | void |
55 | nfs4_renew_state(struct work_struct *work) |
56 | { |
57 | struct nfs4_state_maintenance_ops *ops; |
58 | struct nfs_client *clp = |
59 | container_of(work, struct nfs_client, cl_renewd.work); |
60 | struct rpc_cred *cred; |
61 | long lease; |
62 | unsigned long last, now; |
63 | |
64 | ops = nfs4_state_renewal_ops[clp->cl_minorversion]; |
65 | dprintk("%s: start\n", __func__); |
66 | /* Are there any active superblocks? */ |
67 | if (list_empty(&clp->cl_superblocks)) |
68 | goto out; |
69 | spin_lock(&clp->cl_lock); |
70 | lease = clp->cl_lease_time; |
71 | last = clp->cl_last_renewal; |
72 | now = jiffies; |
73 | /* Are we close to a lease timeout? */ |
74 | if (time_after(now, last + lease/3)) { |
75 | cred = ops->get_state_renewal_cred_locked(clp); |
76 | spin_unlock(&clp->cl_lock); |
77 | 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. */ |
85 | ops->sched_state_renewal(clp, cred); |
86 | put_rpccred(cred); |
87 | goto out_exp; |
88 | } |
89 | } else { |
90 | dprintk("%s: failed to call renewd. Reason: lease not expired \n", |
91 | __func__); |
92 | spin_unlock(&clp->cl_lock); |
93 | } |
94 | nfs4_schedule_state_renewal(clp); |
95 | out_exp: |
96 | nfs_expire_unreferenced_delegations(clp); |
97 | out: |
98 | dprintk("%s: done\n", __func__); |
99 | } |
100 | |
101 | void |
102 | nfs4_schedule_state_renewal(struct nfs_client *clp) |
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", |
112 | __func__, (timeout + HZ - 1) / HZ); |
113 | cancel_delayed_work(&clp->cl_renewd); |
114 | schedule_delayed_work(&clp->cl_renewd, timeout); |
115 | set_bit(NFS_CS_RENEWD, &clp->cl_res_state); |
116 | spin_unlock(&clp->cl_lock); |
117 | } |
118 | |
119 | void |
120 | nfs4_kill_renewd(struct nfs_client *clp) |
121 | { |
122 | cancel_delayed_work_sync(&clp->cl_renewd); |
123 | } |
124 | |
125 | /* |
126 | * Local variables: |
127 | * c-basic-offset: 8 |
128 | * End: |
129 | */ |
130 |
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