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 <redacted>
Tested-by: Laurence Oberman <redacted>
---
 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);