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block: Enhance new plugging support to support general callbacks

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md/raid requires an unplug callback, but as it does not uses
requests the current code cannot provide one.

So allow arbitrary callbacks to be attached to the blk_plug.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
NeilBrown
2011-04-18 09:52:22 +02:00
committed by Jens Axboe
parent a1b49cb7e2
commit 048c9374a7
2 changed files with 26 additions and 1 deletions
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7
include/linux/blkdev.h
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@@ -860,8 +860,13 @@ extern void blk_put_queue(struct request_queue *);
struct blk_plug {
unsigned long magic;
struct list_head list;
struct list_head cb_list;
unsigned int should_sort;
};
struct blk_plug_cb {
struct list_head list;
void (*callback)(struct blk_plug_cb *);
};
extern void blk_start_plug(struct blk_plug *);
extern void blk_finish_plug(struct blk_plug *);
@@ -887,7 +892,7 @@ static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
struct blk_plug *plug = tsk->plug;
return plug && !list_empty(&plug->list);
return plug && (!list_empty(&plug->list) || !list_empty(&plug->cb_list));
}
/*