[PATCH 4/4] md: fast clone bio in bio_clone_mddev()

Ming Lei
2017-02-05T06:22:56Z

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().

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
drivers/md/md.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 704be11355a9..7d176f025add 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -193,10 +193,14 @@ EXPORT_SYMBOL_GPL(bio_alloc_mddev);
struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
struct mddev *mddev)
{
+ struct bio_set *bs;
+
if (!mddev || !mddev->bio_set)
- return bio_clone(bio, gfp_mask);
+ bs = fs_bio_set;
+ else
+ bs = mddev->bio_set;

- return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
+ return bio_clone_fast(bio, gfp_mask, bs);
}
EXPORT_SYMBOL_GPL(bio_clone_mddev);

--
2.7.4