md/raid10: don't call bio_start_io_acct twice for bio which experienced read error

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@kernel.org>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230314012258.2395894-1-yukuai1@huaweicloud.com

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 375ed73..4fcfcb3 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1250,7 +1250,8 @@ 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_alloc_clone(rdev->bdev, bio, gfp, &mddev->bio_set);
 
@@ -1580,6 +1581,7 @@ 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);