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block: add API for delaying work/request_fn a little bit

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Currently we use plugging for that, but as plugging is going away,
we need an alternative mechanism.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Jens Axboe
2011-03-02 11:08:00 -05:00
parent 53f22956ef
commit 3cca6dc1c8
2 changed files with 35 additions and 0 deletions
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6
include/linux/blkdev.h
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@ -300,6 +300,11 @@ struct request_queue
unsigned long unplug_delay; /* After this many jiffies */
struct work_struct unplug_work;
/*
* Delayed queue handling
*/
struct delayed_work delay_work;
struct backing_dev_info backing_dev_info;
/*
@ -677,6 +682,7 @@ extern int blk_insert_cloned_request(struct request_queue *q,
extern void blk_plug_device(struct request_queue *);
extern void blk_plug_device_unlocked(struct request_queue *);
extern int blk_remove_plug(struct request_queue *);
extern void blk_delay_queue(struct request_queue *, unsigned long);
extern void blk_recount_segments(struct request_queue *, struct bio *);
extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
unsigned int, void __user *);