1 /* 1 /*
2 * fs/nfs/nfs4renewd.c 2 * fs/nfs/nfs4renewd.c
3 * 3 *
4 * Copyright (c) 2002 The Regents of the Univ 4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Kendrick Smith <kmsmith@umich.edu> 7 * Kendrick Smith <kmsmith@umich.edu>
8 * 8 *
9 * Redistribution and use in source and binar 9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that 10 * modification, are permitted provided that the following conditions
11 * are met: 11 * are met:
12 * 12 *
13 * 1. Redistributions of source code must ret 13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the 14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must rep 15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the 16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials pr 17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor 18 * 3. Neither the name of the University nor the names of its
19 * contributors may be used to endorse or 19 * contributors may be used to endorse or promote products derived
20 * from this software without specific pri 20 * from this software without specific prior written permission.
21 * 21 *
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND AN 22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICUL 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS 25 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPEC 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND 29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIA 30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WA 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILI 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * 33 *
34 * Implementation of the NFSv4 "renew daemon", 34 * Implementation of the NFSv4 "renew daemon", which wakes up periodically to
35 * send a RENEW, to keep state alive on the se 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, s 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_serve 37 * context. There is one renewd per nfs_server.
38 * 38 *
39 */ 39 */
40 40
41 #include <linux/mm.h> 41 #include <linux/mm.h>
42 #include <linux/pagemap.h> 42 #include <linux/pagemap.h>
43 #include <linux/sunrpc/sched.h> 43 #include <linux/sunrpc/sched.h>
44 #include <linux/sunrpc/clnt.h> 44 #include <linux/sunrpc/clnt.h>
45 45
46 #include <linux/nfs.h> 46 #include <linux/nfs.h>
47 #include <linux/nfs4.h> 47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h> 48 #include <linux/nfs_fs.h>
49 #include "nfs4_fs.h" 49 #include "nfs4_fs.h"
50 #include "delegation.h" 50 #include "delegation.h"
51 51
52 #define NFSDBG_FACILITY NFSDBG_STATE 52 #define NFSDBG_FACILITY NFSDBG_STATE
53 53
54 void 54 void
55 nfs4_renew_state(struct work_struct *work) 55 nfs4_renew_state(struct work_struct *work)
56 { 56 {
57 const struct nfs4_state_maintenance_op 57 const struct nfs4_state_maintenance_ops *ops;
58 struct nfs_client *clp = 58 struct nfs_client *clp =
59 container_of(work, struct nfs_ 59 container_of(work, struct nfs_client, cl_renewd.work);
60 const struct cred *cred; 60 const struct cred *cred;
61 long lease; 61 long lease;
62 unsigned long last, now; 62 unsigned long last, now;
63 unsigned renew_flags = 0; 63 unsigned renew_flags = 0;
64 64
65 ops = clp->cl_mvops->state_renewal_ops 65 ops = clp->cl_mvops->state_renewal_ops;
66 dprintk("%s: start\n", __func__); 66 dprintk("%s: start\n", __func__);
67 67
68 if (test_bit(NFS_CS_STOP_RENEW, &clp-> 68 if (test_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state))
69 goto out; 69 goto out;
70 70
71 lease = clp->cl_lease_time; 71 lease = clp->cl_lease_time;
72 last = clp->cl_last_renewal; 72 last = clp->cl_last_renewal;
73 now = jiffies; 73 now = jiffies;
74 /* Are we close to a lease timeout? */ 74 /* Are we close to a lease timeout? */
75 if (time_after(now, last + lease/3)) 75 if (time_after(now, last + lease/3))
76 renew_flags |= NFS4_RENEW_TIME 76 renew_flags |= NFS4_RENEW_TIMEOUT;
77 if (nfs_delegations_present(clp)) 77 if (nfs_delegations_present(clp))
78 renew_flags |= NFS4_RENEW_DELE 78 renew_flags |= NFS4_RENEW_DELEGATION_CB;
79 79
80 if (renew_flags != 0) { 80 if (renew_flags != 0) {
81 cred = ops->get_state_renewal_ 81 cred = ops->get_state_renewal_cred(clp);
82 if (cred == NULL) { 82 if (cred == NULL) {
83 if (!(renew_flags & NF 83 if (!(renew_flags & NFS4_RENEW_DELEGATION_CB)) {
84 set_bit(NFS4CL 84 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
85 goto out; 85 goto out;
86 } 86 }
87 nfs_expire_all_delegat 87 nfs_expire_all_delegations(clp);
88 } else { 88 } else {
89 int ret; 89 int ret;
90 90
91 /* Queue an asynchrono 91 /* Queue an asynchronous RENEW. */
92 ret = ops->sched_state 92 ret = ops->sched_state_renewal(clp, cred, renew_flags);
93 put_cred(cred); 93 put_cred(cred);
94 switch (ret) { 94 switch (ret) {
95 default: 95 default:
96 goto out_exp; 96 goto out_exp;
97 case -EAGAIN: 97 case -EAGAIN:
98 case -ENOMEM: 98 case -ENOMEM:
99 break; 99 break;
100 } 100 }
101 } 101 }
102 } else { 102 } else {
103 dprintk("%s: failed to call re 103 dprintk("%s: failed to call renewd. Reason: lease not expired \n",
104 __func__); 104 __func__);
105 } 105 }
106 nfs4_schedule_state_renewal(clp); 106 nfs4_schedule_state_renewal(clp);
107 out_exp: 107 out_exp:
108 nfs_expire_unreferenced_delegations(cl 108 nfs_expire_unreferenced_delegations(clp);
109 out: 109 out:
110 dprintk("%s: done\n", __func__); 110 dprintk("%s: done\n", __func__);
111 } 111 }
112 112
113 void 113 void
114 nfs4_schedule_state_renewal(struct nfs_client 114 nfs4_schedule_state_renewal(struct nfs_client *clp)
115 { 115 {
116 long timeout; 116 long timeout;
117 117
118 spin_lock(&clp->cl_lock); 118 spin_lock(&clp->cl_lock);
119 timeout = (2 * clp->cl_lease_time) / 3 119 timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal
120 - (long)jiffies; 120 - (long)jiffies;
121 if (timeout < 5 * HZ) 121 if (timeout < 5 * HZ)
122 timeout = 5 * HZ; 122 timeout = 5 * HZ;
123 dprintk("%s: requeueing work. Lease pe 123 dprintk("%s: requeueing work. Lease period = %ld\n",
124 __func__, (timeout + H 124 __func__, (timeout + HZ - 1) / HZ);
125 mod_delayed_work(system_wq, &clp->cl_r 125 mod_delayed_work(system_wq, &clp->cl_renewd, timeout);
126 set_bit(NFS_CS_RENEWD, &clp->cl_res_st 126 set_bit(NFS_CS_RENEWD, &clp->cl_res_state);
127 spin_unlock(&clp->cl_lock); 127 spin_unlock(&clp->cl_lock);
128 } 128 }
129 129
130 void 130 void
131 nfs4_kill_renewd(struct nfs_client *clp) 131 nfs4_kill_renewd(struct nfs_client *clp)
132 { 132 {
133 cancel_delayed_work_sync(&clp->cl_rene 133 cancel_delayed_work_sync(&clp->cl_renewd);
134 } 134 }
135 135
136 /** 136 /**
137 * nfs4_set_lease_period - Sets the lease peri 137 * nfs4_set_lease_period - Sets the lease period on a nfs_client
138 * 138 *
139 * @clp: pointer to nfs_client 139 * @clp: pointer to nfs_client
140 * @lease: new value for lease period 140 * @lease: new value for lease period
141 */ 141 */
142 void nfs4_set_lease_period(struct nfs_client * 142 void nfs4_set_lease_period(struct nfs_client *clp,
143 unsigned long lease) 143 unsigned long lease)
144 { 144 {
145 spin_lock(&clp->cl_lock); 145 spin_lock(&clp->cl_lock);
146 clp->cl_lease_time = lease; 146 clp->cl_lease_time = lease;
147 spin_unlock(&clp->cl_lock); 147 spin_unlock(&clp->cl_lock);
148 148
149 /* Cap maximum reconnect timeout at 1/ 149 /* Cap maximum reconnect timeout at 1/2 lease period */
150 rpc_set_connect_timeout(clp->cl_rpccli 150 rpc_set_connect_timeout(clp->cl_rpcclient, lease, lease >> 1);
151 } 151 }
152 152
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.