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SLOW_WORK: Add delayed_slow_work support

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This adds support for starting slow work with a delay, similar
to the functionality we have for workqueues.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Jens Axboe
2009-11-19 18:10:47 +00:00
committed by David Howells
parent 0160950297
commit 6b8268b17a
3 changed files with 171 additions and 3 deletions
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29
include/linux/slow-work.h
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@@ -17,6 +17,7 @@
#ifdef CONFIG_SLOW_WORK
#include <linux/sysctl.h>
#include <linux/timer.h>
struct slow_work;
@@ -52,10 +53,16 @@ struct slow_work {
#define SLOW_WORK_ENQ_DEFERRED 2 /* item enqueue deferred */
#define SLOW_WORK_VERY_SLOW 3 /* item is very slow */
#define SLOW_WORK_CANCELLING 4 /* item is being cancelled, don't enqueue */
#define SLOW_WORK_DELAYED 5 /* item is struct delayed_slow_work with active timer */
const struct slow_work_ops *ops; /* operations table for this item */
struct list_head link; /* link in queue */
};
struct delayed_slow_work {
struct slow_work work;
struct timer_list timer;
};
/**
* slow_work_init - Initialise a slow work item
* @work: The work item to initialise
@@ -71,6 +78,20 @@ static inline void slow_work_init(struct slow_work *work,
INIT_LIST_HEAD(&work->link);
}
/**
* slow_work_init - Initialise a delayed slow work item
* @work: The work item to initialise
* @ops: The operations to use to handle the slow work item
*
* Initialise a delayed slow work item.
*/
static inline void delayed_slow_work_init(struct delayed_slow_work *dwork,
const struct slow_work_ops *ops)
{
init_timer(&dwork->timer);
slow_work_init(&dwork->work, ops);
}
/**
* vslow_work_init - Initialise a very slow work item
* @work: The work item to initialise
@@ -93,6 +114,14 @@ extern void slow_work_cancel(struct slow_work *work);
extern int slow_work_register_user(struct module *owner);
extern void slow_work_unregister_user(struct module *owner);
extern int delayed_slow_work_enqueue(struct delayed_slow_work *dwork,
unsigned long delay);
static inline void delayed_slow_work_cancel(struct delayed_slow_work *dwork)
{
slow_work_cancel(&dwork->work);
}
#ifdef CONFIG_SYSCTL
extern ctl_table slow_work_sysctls[];
#endif