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