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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_STATE
53
54void
55nfs4_renew_state(struct work_struct *work)
56{
57 const struct nfs4_state_maintenance_ops *ops;
58 struct nfs_client *clp =
59 container_of(work, struct nfs_client, cl_renewd.work);
60 const struct cred *cred;
61 long lease;
62 unsigned long last, now;
63 unsigned renew_flags = 0;
64
65 ops = clp->cl_mvops->state_renewal_ops;
66 dprintk("%s: start\n", __func__);
67
68 if (test_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state))
69 goto out;
70
71 lease = clp->cl_lease_time;
72 last = clp->cl_last_renewal;
73 now = jiffies;
74
75 if (time_after(now, last + lease/3))
76 renew_flags |= NFS4_RENEW_TIMEOUT;
77 if (nfs_delegations_present(clp))
78 renew_flags |= NFS4_RENEW_DELEGATION_CB;
79
80 if (renew_flags != 0) {
81 cred = ops->get_state_renewal_cred(clp);
82 if (cred == NULL) {
83 if (!(renew_flags & NFS4_RENEW_DELEGATION_CB)) {
84 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
85 goto out;
86 }
87 nfs_expire_all_delegations(clp);
88 } else {
89 int ret;
90
91
92 ret = ops->sched_state_renewal(clp, cred, renew_flags);
93 put_cred(cred);
94 switch (ret) {
95 default:
96 goto out_exp;
97 case -EAGAIN:
98 case -ENOMEM:
99 break;
100 }
101 }
102 } else {
103 dprintk("%s: failed to call renewd. Reason: lease not expired \n",
104 __func__);
105 }
106 nfs4_schedule_state_renewal(clp);
107out_exp:
108 nfs_expire_unreferenced_delegations(clp);
109out:
110 dprintk("%s: done\n", __func__);
111}
112
113void
114nfs4_schedule_state_renewal(struct nfs_client *clp)
115{
116 long timeout;
117
118 spin_lock(&clp->cl_lock);
119 timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal
120 - (long)jiffies;
121 if (timeout < 5 * HZ)
122 timeout = 5 * HZ;
123 dprintk("%s: requeueing work. Lease period = %ld\n",
124 __func__, (timeout + HZ - 1) / HZ);
125 mod_delayed_work(system_wq, &clp->cl_renewd, timeout);
126 set_bit(NFS_CS_RENEWD, &clp->cl_res_state);
127 spin_unlock(&clp->cl_lock);
128}
129
130void
131nfs4_kill_renewd(struct nfs_client *clp)
132{
133 cancel_delayed_work_sync(&clp->cl_renewd);
134}
135
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141
142
143void nfs4_set_lease_period(struct nfs_client *clp,
144 unsigned long lease,
145 unsigned long lastrenewed)
146{
147 spin_lock(&clp->cl_lock);
148 clp->cl_lease_time = lease;
149 clp->cl_last_renewal = lastrenewed;
150 spin_unlock(&clp->cl_lock);
151
152
153 rpc_set_connect_timeout(clp->cl_rpcclient, lease, lease >> 1);
154}
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