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block: Clean up special command handling logic

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Remove special-casing of non-rw fs style requests (discard). The nomerge
flags are consolidated in blk_types.h, and rq_mergeable() and
bio_mergeable() have been modified to use them.

bio_is_rw() is used in place of bio_has_data() a few places. This is
done to to distinguish true reads and writes from other fs type requests
that carry a payload (e.g. write same).

Signed-off-by: Martin K. Petersen <[email protected]>
Acked-by: Mike Snitzer <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Martin K. Petersen 2012-09-18 12:19:25 -04:00 • committed by Jens Axboe
commit e2a60da74f
7 changed files with 46 additions and 49 deletions
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5
block/blk.h
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@ -171,14 +171,13 @@ static inline int queue_congestion_off_threshold(struct request_queue *q)
*
* a) it's attached to a gendisk, and
* b) the queue had IO stats enabled when this request was started, and
* c) it's a file system request or a discard request
* c) it's a file system request
*/
static inline int blk_do_io_stat(struct request *rq)
{
return rq->rq_disk &&
(rq->cmd_flags & REQ_IO_STAT) &&
(rq->cmd_type == REQ_TYPE_FS ||
(rq->cmd_flags & REQ_DISCARD));
(rq->cmd_type == REQ_TYPE_FS);
}
/*