[PATCH] md: raid0: account for split bio in iostat accounting

[David Jeffery <djeffery@xxxxxxxxxx>]

When a bio is split by md raid0, the newly created bio will not be tracked
by md for I/O accounting. Only the portion of I/O still assigned to the
original bio which was reduced by the split will be accounted for. This
results in md iostat data sometimes showing I/O values far below the actual
amount of data being sent through md.

md_account_bio() needs to be called for all bio generated by the bio split.

Signed-off-by: David Jeffery <djeffery@xxxxxxxxxx>
Tested-by: Laurence Oberman <loberman@xxxxxxxxxx>
---
 drivers/md/raid0.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index d1ac73fcd852..1fd559ac8c68 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -597,8 +597,7 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio)
 		bio = split;
 	}
 
-	if (bio->bi_pool != &mddev->bio_set)
-		md_account_bio(mddev, &bio);
+	md_account_bio(mddev, &bio);
 
 	orig_sector = sector;
 	zone = find_zone(mddev->private, &sector);
-- 
2.41.0