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41f63c5359
Convert delayed_work users doing cancel_delayed_work() followed by
queue_delayed_work() to mod_delayed_work().
Most conversions are straight-forward. Ones worth mentioning are,
* drivers/edac/edac_mc.c: edac_mc_workq_setup() converted to always
use mod_delayed_work() and cancel loop in
edac_mc_reset_delay_period() is dropped.
* drivers/platform/x86/thinkpad_acpi.c: No need to remember whether
watchdog is active or not. @fan_watchdog_active and related code
dropped.
* drivers/power/charger-manager.c: Seemingly a lot of
delayed_work_pending() abuse going on here.
[delayed_]work_pending() are unsynchronized and racy when used like
this. I converted one instance in fullbatt_handler(). Please
conver the rest so that it invokes workqueue APIs for the intended
target state rather than trying to game work item pending state
transitions. e.g. if timer should be modified - call
mod_delayed_work(), canceled - call cancel_delayed_work[_sync]().
* drivers/thermal/thermal_sys.c: thermal_zone_device_set_polling()
simplified. Note that round_jiffies() calls in this function are
meaningless. round_jiffies() work on absolute jiffies not delta
delay used by delayed_work.
v2: Tomi pointed out that __cancel_delayed_work() users can't be
safely converted to mod_delayed_work(). They could be calling it
from irq context and if that happens while delayed_work_timer_fn()
is running, it could deadlock. __cancel_delayed_work() users are
dropped.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Doug Thompson <dougthompson@xmission.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Roland Dreier <roland@kernel.org>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Johannes Berg <johannes@sipsolutions.net>
136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/*
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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 <kmsmith@umich.edu>
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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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struct rpc_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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spin_lock(&clp->cl_lock);
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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_locked(clp);
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spin_unlock(&clp->cl_lock);
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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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/* Queue an asynchronous RENEW. */
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ops->sched_state_renewal(clp, cred, renew_flags);
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put_rpccred(cred);
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goto out_exp;
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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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spin_unlock(&clp->cl_lock);
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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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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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