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fs/nfs/nfs4renewd.c
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/* * 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. * |
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*/ |
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#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> |
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#include "nfs4_fs.h" |
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#include "delegation.h" |
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#define NFSDBG_FACILITY NFSDBG_STATE |
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void |
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nfs4_renew_state(struct work_struct *work) |
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{ |
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const struct nfs4_state_maintenance_ops *ops; |
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struct nfs_client *clp = container_of(work, struct nfs_client, cl_renewd.work); |
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const struct cred *cred; |
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long lease; |
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unsigned long last, now; |
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unsigned renew_flags = 0; |
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ops = clp->cl_mvops->state_renewal_ops; |
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dprintk("%s: start ", __func__); |
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if (test_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state)) |
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goto out; |
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lease = clp->cl_lease_time; last = clp->cl_last_renewal; now = jiffies; |
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/* Are we close to a lease timeout? */ |
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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) { |
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cred = ops->get_state_renewal_cred(clp); |
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if (cred == NULL) { |
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if (!(renew_flags & NFS4_RENEW_DELEGATION_CB)) { |
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set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); goto out; } |
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nfs_expire_all_delegations(clp); |
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} else { |
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int ret; |
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/* Queue an asynchronous RENEW. */ |
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ret = ops->sched_state_renewal(clp, cred, renew_flags); |
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put_cred(cred); |
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switch (ret) { default: goto out_exp; case -EAGAIN: case -ENOMEM: break; } |
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} |
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} else { |
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dprintk("%s: failed to call renewd. Reason: lease not expired ", |
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__func__); |
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} nfs4_schedule_state_renewal(clp); out_exp: |
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nfs_expire_unreferenced_delegations(clp); |
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out: |
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dprintk("%s: done ", __func__); |
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} |
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void |
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nfs4_schedule_state_renewal(struct nfs_client *clp) |
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{ 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 ", |
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__func__, (timeout + HZ - 1) / HZ); |
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mod_delayed_work(system_wq, &clp->cl_renewd, timeout); |
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set_bit(NFS_CS_RENEWD, &clp->cl_res_state); |
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spin_unlock(&clp->cl_lock); } void |
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nfs4_kill_renewd(struct nfs_client *clp) |
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{ |
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cancel_delayed_work_sync(&clp->cl_renewd); |
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} |
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/** * nfs4_set_lease_period - Sets the lease period on a nfs_client * * @clp: pointer to nfs_client * @lease: new value for lease period |
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*/ void nfs4_set_lease_period(struct nfs_client *clp, |
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unsigned long lease) |
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{ spin_lock(&clp->cl_lock); clp->cl_lease_time = lease; |
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spin_unlock(&clp->cl_lock); |
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/* Cap maximum reconnect timeout at 1/2 lease period */ |
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rpc_set_connect_timeout(clp->cl_rpcclient, lease, lease >> 1); |
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} |
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/* * Local variables: * c-basic-offset: 8 * End: */ |