On 6/15/22 19:19, Pankaj Raghav wrote:
> dm_zone_endio() updates the bi_sector of orig bio for zoned devices that
> uses either native append or append emulation and it is called before the
> endio of the target. But target endio can still update the clone bio
> after dm_zone_endio is called, thereby, the orig bio does not contain
> the updated information anymore. Call dm_zone_endio for zoned devices
> after calling the target's endio function
>
> Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
> ---
> @Damien and @Hannes: I couldn't come up with a testcase that uses endio callback and
> zone append or append emulation for zoned devices to test for
> regression in this change. It would be great if you can suggest
> something. This change is required for the npo2 target as we update the
> clone bio sector in the endio callback function and the orig bio should
> be updated only after the endio callback for zone appends.
Running zonefs tests on top of dm-crypt will exercise DM zone append
emulation.
>
> drivers/md/dm.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 3f17fe1de..3a74e1038 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1025,10 +1025,6 @@ static void clone_endio(struct bio *bio)
> disable_write_zeroes(md);
> }
>
> - if (static_branch_unlikely(&zoned_enabled) &&
> - unlikely(blk_queue_is_zoned(bdev_get_queue(bio->bi_bdev))))
> - dm_zone_endio(io, bio);
> -
> if (endio) {
> int r = endio(ti, bio, &error);
> switch (r) {
> @@ -1057,6 +1053,10 @@ static void clone_endio(struct bio *bio)
> }
> }
>
> + if (static_branch_unlikely(&zoned_enabled) &&
> + unlikely(blk_queue_is_zoned(bdev_get_queue(bio->bi_bdev))))
blk_queue_is_zoned(bdev_get_queue(bio->bi_bdev))) ->
bdev_is_zoned(bio->bi_bdev)
> + dm_zone_endio(io, bio);
> +
> if (static_branch_unlikely(&swap_bios_enabled) &&
> unlikely(swap_bios_limit(ti, bio)))
> up(&md->swap_bios_semaphore);
--
Damien Le Moal
Western Digital Research
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