This is a note to let you know that I've just added the patch titled
md/raid10: don't call bio_start_io_acct twice for bio which experienced read error
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-raid10-don-t-call-bio_start_io_acct-twice-for-bio.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 34d50b8269c03c3759cd5030b2ff78bbeaa3d9a7
Author: Yu Kuai <yukuai3@xxxxxxxxxx>
Date: Tue Mar 14 09:22:58 2023 +0800
md/raid10: don't call bio_start_io_acct twice for bio which experienced read error
[ Upstream commit 7cddb055bfda5f7b0be931e8ea750fc28bc18a27 ]
handle_read_error() will resumit r10_bio by raid10_read_request(), which
will call bio_start_io_acct() again, while bio_end_io_acct() will only
be called once.
Fix the problem by don't account io again from handle_read_error().
Fixes: 528bc2cf2fcc ("md/raid10: enable io accounting")
Suggested-by: Song Liu <song@xxxxxxxxxx>
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230314012258.2395894-1-yukuai1@xxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 9fc9198fc5c4f..5df5e7df6069c 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1216,7 +1216,8 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
}
slot = r10_bio->read_slot;
- if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue))
+ if (!r10_bio->start_time &&
+ blk_queue_io_stat(bio->bi_bdev->bd_disk->queue))
r10_bio->start_time = bio_start_io_acct(bio);
read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set);
@@ -1550,6 +1551,7 @@ static void __make_request(struct mddev *mddev, struct bio *bio, int sectors)
r10_bio->sector = bio->bi_iter.bi_sector;
r10_bio->state = 0;
r10_bio->read_slot = -1;
+ r10_bio->start_time = 0;
memset(r10_bio->devs, 0, sizeof(r10_bio->devs[0]) *
conf->geo.raid_disks);
