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charset="utf-8" Set BLK_FEAT_ATOMIC_WRITES_STACKED to enable atomic writes. For an attempt to atomic write to a region which has bad blocks, error the write as we just cannot do this. It is unlikely to find devices which support atomic writes and bad blocks. Signed-off-by: John Garry Reviewed-by: Yu Kuai --- drivers/md/raid1.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index a5adf08ee174..cd44b4bebf49 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1571,7 +1571,15 @@ static void raid1_write_request(struct mddev *mddev,= struct bio *bio, continue; } if (is_bad) { - int good_sectors =3D first_bad - r1_bio->sector; + int good_sectors; + + if (bio->bi_opf & REQ_ATOMIC) { + /* We just cannot atomically write this ... */ + error =3D -EFAULT; + goto err_handle; + } + + good_sectors =3D first_bad - r1_bio->sector; if (good_sectors < max_sectors) max_sectors =3D good_sectors; } @@ -1657,7 +1665,8 @@ static void raid1_write_request(struct mddev *mddev, = struct bio *bio, =20 mbio->bi_iter.bi_sector =3D (r1_bio->sector + rdev->data_offset); mbio->bi_end_io =3D raid1_end_write_request; - mbio->bi_opf =3D bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); + mbio->bi_opf =3D bio_op(bio) | + (bio->bi_opf & (REQ_SYNC | REQ_FUA | REQ_ATOMIC)); if (test_bit(FailFast, &rdev->flags) && !test_bit(WriteMostly, &rdev->flags) && conf->raid_disks - mddev->degraded > 1) @@ -3224,6 +3233,7 @@ static int raid1_set_limits(struct mddev *mddev) =20 md_init_stacking_limits(&lim); lim.max_write_zeroes_sectors =3D 0; + lim.features |=3D BLK_FEAT_ATOMIC_WRITES_STACKED; err =3D mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) { queue_limits_cancel_update(mddev->gendisk->queue); --=20 2.31.1