block: add API for delaying work/request_fn a little bit
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>
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e3ee74f..f55b2a8 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -300,6 +300,11 @@
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 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 *);