Commit 11dfce50 authored by Junichi Nomura's avatar Junichi Nomura Committed by Jens Axboe

block: use bio_clone_fast() in blk_rq_prep_clone()

Request cloning clones bios in the request to track the completion
of each bio.
For that purpose, we can use bio_clone_fast() instead of bio_clone()
to avoid unnecessary allocation and copy of bvecs.

This patch reduces memory footprint of request-based device-mapper
(about 1-4KB for each request) and is a preparation for further
reduction of memory usage by removing unused bvec mempool.
Signed-off-by: default avatarJun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 4a0efdc9
...@@ -2926,7 +2926,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src, ...@@ -2926,7 +2926,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
blk_rq_init(NULL, rq); blk_rq_init(NULL, rq);
__rq_for_each_bio(bio_src, rq_src) { __rq_for_each_bio(bio_src, rq_src) {
bio = bio_clone_bioset(bio_src, gfp_mask, bs); bio = bio_clone_fast(bio_src, gfp_mask, bs);
if (!bio) if (!bio)
goto free_and_out; goto free_and_out;
......
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