161 строка
4.7 KiB
C
161 строка
4.7 KiB
C
/*
|
|
* fs/nfs/nfs4renewd.c
|
|
*
|
|
* Copyright (c) 2002 The Regents of the University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Kendrick Smith <kmsmith@umich.edu>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* Implementation of the NFSv4 "renew daemon", which wakes up periodically to
|
|
* send a RENEW, to keep state alive on the server. The daemon is implemented
|
|
* as an rpc_task, not a real kernel thread, so it always runs in rpciod's
|
|
* context. There is one renewd per nfs_server.
|
|
*
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/sunrpc/sched.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
|
|
#include <linux/nfs.h>
|
|
#include <linux/nfs4.h>
|
|
#include <linux/nfs_fs.h>
|
|
#include "nfs4_fs.h"
|
|
#include "delegation.h"
|
|
|
|
#define NFSDBG_FACILITY NFSDBG_STATE
|
|
|
|
void
|
|
nfs4_renew_state(struct work_struct *work)
|
|
{
|
|
const struct nfs4_state_maintenance_ops *ops;
|
|
struct nfs_client *clp =
|
|
container_of(work, struct nfs_client, cl_renewd.work);
|
|
const struct cred *cred;
|
|
long lease;
|
|
unsigned long last, now;
|
|
unsigned renew_flags = 0;
|
|
|
|
ops = clp->cl_mvops->state_renewal_ops;
|
|
dprintk("%s: start\n", __func__);
|
|
|
|
if (test_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state))
|
|
goto out;
|
|
|
|
lease = clp->cl_lease_time;
|
|
last = clp->cl_last_renewal;
|
|
now = jiffies;
|
|
/* Are we close to a lease timeout? */
|
|
if (time_after(now, last + lease/3))
|
|
renew_flags |= NFS4_RENEW_TIMEOUT;
|
|
if (nfs_delegations_present(clp))
|
|
renew_flags |= NFS4_RENEW_DELEGATION_CB;
|
|
|
|
if (renew_flags != 0) {
|
|
cred = ops->get_state_renewal_cred(clp);
|
|
if (cred == NULL) {
|
|
if (!(renew_flags & NFS4_RENEW_DELEGATION_CB)) {
|
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
|
|
goto out;
|
|
}
|
|
nfs_expire_all_delegations(clp);
|
|
} else {
|
|
int ret;
|
|
|
|
/* Queue an asynchronous RENEW. */
|
|
ret = ops->sched_state_renewal(clp, cred, renew_flags);
|
|
put_cred(cred);
|
|
switch (ret) {
|
|
default:
|
|
goto out_exp;
|
|
case -EAGAIN:
|
|
case -ENOMEM:
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
dprintk("%s: failed to call renewd. Reason: lease not expired \n",
|
|
__func__);
|
|
}
|
|
nfs4_schedule_state_renewal(clp);
|
|
out_exp:
|
|
nfs_expire_unreferenced_delegations(clp);
|
|
out:
|
|
dprintk("%s: done\n", __func__);
|
|
}
|
|
|
|
void
|
|
nfs4_schedule_state_renewal(struct nfs_client *clp)
|
|
{
|
|
long timeout;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal
|
|
- (long)jiffies;
|
|
if (timeout < 5 * HZ)
|
|
timeout = 5 * HZ;
|
|
dprintk("%s: requeueing work. Lease period = %ld\n",
|
|
__func__, (timeout + HZ - 1) / HZ);
|
|
mod_delayed_work(system_wq, &clp->cl_renewd, timeout);
|
|
set_bit(NFS_CS_RENEWD, &clp->cl_res_state);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
void
|
|
nfs4_kill_renewd(struct nfs_client *clp)
|
|
{
|
|
cancel_delayed_work_sync(&clp->cl_renewd);
|
|
}
|
|
|
|
/**
|
|
* nfs4_set_lease_period - Sets the lease period on a nfs_client
|
|
*
|
|
* @clp: pointer to nfs_client
|
|
* @lease: new value for lease period
|
|
* @lastrenewed: time at which lease was last renewed
|
|
*/
|
|
void nfs4_set_lease_period(struct nfs_client *clp,
|
|
unsigned long lease,
|
|
unsigned long lastrenewed)
|
|
{
|
|
spin_lock(&clp->cl_lock);
|
|
clp->cl_lease_time = lease;
|
|
clp->cl_last_renewal = lastrenewed;
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
/* Cap maximum reconnect timeout at 1/2 lease period */
|
|
rpc_set_connect_timeout(clp->cl_rpcclient, lease, lease >> 1);
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|