From 1e739730c5b9ea80a2f25e9cf6e1025d47e3d8ed Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 8 Feb 2017 14:46:49 +0100 Subject: block: optionally merge discontiguous discard bios into a single request Add a new merge strategy that merges discard bios into a request until the maximum number of discard ranges (or the maximum discard size) is reached from the plug merging code. I/O scheduler merging is not wired up yet but might also be useful, although not for fast devices like NVMe which are the only user for now. Note that for now we don't support limiting the size of each discard range, but if needed that can be added later. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- block/blk.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'block/blk.h') diff --git a/block/blk.h b/block/blk.h index ae82f2a..d1ea4bd9 100644 --- a/block/blk.h +++ b/block/blk.h @@ -100,6 +100,8 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req, struct bio *bio); bool bio_attempt_back_merge(struct request_queue *q, struct request *req, struct bio *bio); +bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, + struct bio *bio); bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, unsigned int *request_count, struct request **same_queue_rq); -- cgit v1.1