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md: fast clone bio in bio_clone_mddev()

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Firstly bio_clone_mddev() is used in raid normal I/O and isn't
in resync I/O path.

Secondly all the direct access to bvec table in raid happens on
resync I/O except for write behind of raid1, in which we still
use bio_clone() for allocating new bvec table.

So this patch replaces bio_clone() with bio_clone_fast()
in bio_clone_mddev().

Also kill bio_clone_mddev() and call bio_clone_fast() directly, as
suggested by Christoph Hellwig.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Ming Lei
2017-02-14 23:29:03 +08:00
committed by Shaohua Li
parent ed7ef732ca
commit d7a1030839
6 changed files with 14 additions and 22 deletions
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2
drivers/md/faulty.c
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@@ -214,7 +214,7 @@ static void faulty_make_request(struct mddev *mddev, struct bio *bio)
}
}
if (failit) {
struct bio *b = bio_clone_mddev(bio, GFP_NOIO, mddev);
struct bio *b = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
b->bi_bdev = conf->rdev->bdev;
b->bi_private = bio;