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Revert "block: add callback function for unplug notification" 

MD can't use this since it really requires us to be able to
keep more than a single piece of state for the unplug. Commit
048c9374 added the required support for MD, so get rid of this
now unused code.

This reverts commit f75664570d.

Conflicts:

	block/blk-core.c

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Jens Axboe 2011-04-18 09:54:05 +02:00
parent 048c9374a7
commit b4cb290e0a
3 changed files with 0 additions and 22 deletions
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3
block/blk-core.c
View File

@ -2674,9 +2674,6 @@ static void queue_unplugged(struct request_queue *q, unsigned int depth,
{
trace_block_unplug(q, depth, !from_schedule);
__blk_run_queue(q, from_schedule);
if (q->unplugged_fn)
q->unplugged_fn(q);
}
static void flush_plug_callbacks(struct blk_plug *plug)

16
block/blk-settings.c
View File

@ -790,22 +790,6 @@ void blk_queue_flush(struct request_queue *q, unsigned int flush)
}
EXPORT_SYMBOL_GPL(blk_queue_flush);
/**
* blk_queue_unplugged - register a callback for an unplug event
* @q: the request queue for the device
* @fn: the function to call
*
* Some stacked drivers may need to know when IO is dispatched on an
* unplug event. By registrering a callback here, they will be notified
* when someone flushes their on-stack queue plug. The function will be
* called with the queue lock held.
*/
void blk_queue_unplugged(struct request_queue *q, unplugged_fn *fn)
{
q->unplugged_fn = fn;
}
EXPORT_SYMBOL(blk_queue_unplugged);
static int __init blk_settings_init(void)
{
blk_max_low_pfn = max_low_pfn - 1;

3
include/linux/blkdev.h
View File

@ -196,7 +196,6 @@ typedef void (request_fn_proc) (struct request_queue *q);
typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
typedef int (prep_rq_fn) (struct request_queue *, struct request *);
typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
typedef void (unplugged_fn) (struct request_queue *);
struct bio_vec;
struct bvec_merge_data {
@ -284,7 +283,6 @@ struct request_queue
rq_timed_out_fn *rq_timed_out_fn;
dma_drain_needed_fn *dma_drain_needed;
lld_busy_fn *lld_busy_fn;
unplugged_fn *unplugged_fn;
/*
* Dispatch queue sorting
@ -843,7 +841,6 @@ extern void blk_queue_dma_alignment(struct request_queue *, int);
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
extern void blk_queue_unplugged(struct request_queue *, unplugged_fn *);
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
extern void blk_queue_flush(struct request_queue *q, unsigned int flush);
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);