Re: [PATCH 4/4] dm: add zone open, close and finish support

[Damien Le Moal <Damien.LeMoal@wdc.com>]

On 2019/06/21 22:07, Matias Bjørling wrote:
> From: Ajay Joshi <ajay.joshi@wdc.com>
> 
> Implement REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH
> support to allow explicit control of zone states.
> 
> Signed-off-by: Ajay Joshi <ajay.joshi@wdc.com>
> ---
>  drivers/md/dm-flakey.c    | 7 +++----
>  drivers/md/dm-linear.c    | 2 +-
>  drivers/md/dm.c           | 5 +++--
>  include/linux/blk_types.h | 8 ++++++++
>  4 files changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
> index a9bc518156f2..fff529c0732c 100644
> --- a/drivers/md/dm-flakey.c
> +++ b/drivers/md/dm-flakey.c
> @@ -280,7 +280,7 @@ static void flakey_map_bio(struct dm_target *ti, struct bio *bio)
>  	struct flakey_c *fc = ti->private;
>  
>  	bio_set_dev(bio, fc->dev->bdev);
> -	if (bio_sectors(bio) || bio_op(bio) == REQ_OP_ZONE_RESET)
> +	if (bio_sectors(bio) || bio_is_zone_mgmt_op(bio))
>  		bio->bi_iter.bi_sector =
>  			flakey_map_sector(ti, bio->bi_iter.bi_sector);
>  }
> @@ -322,8 +322,7 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
>  	struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
>  	pb->bio_submitted = false;
>  
> -	/* Do not fail reset zone */
> -	if (bio_op(bio) == REQ_OP_ZONE_RESET)
> +	if (bio_is_zone_mgmt_op(bio))
>  		goto map_bio;
>  
>  	/* Are we alive ? */
> @@ -384,7 +383,7 @@ static int flakey_end_io(struct dm_target *ti, struct bio *bio,
>  	struct flakey_c *fc = ti->private;
>  	struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
>  
> -	if (bio_op(bio) == REQ_OP_ZONE_RESET)
> +	if (bio_is_zone_mgmt_op(bio))
>  		return DM_ENDIO_DONE;
>  
>  	if (!*error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
> diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
> index ad980a38fb1e..217a1dee8197 100644
> --- a/drivers/md/dm-linear.c
> +++ b/drivers/md/dm-linear.c
> @@ -90,7 +90,7 @@ static void linear_map_bio(struct dm_target *ti, struct bio *bio)
>  	struct linear_c *lc = ti->private;
>  
>  	bio_set_dev(bio, lc->dev->bdev);
> -	if (bio_sectors(bio) || bio_op(bio) == REQ_OP_ZONE_RESET)
> +	if (bio_sectors(bio) || bio_is_zone_mgmt_op(bio))
>  		bio->bi_iter.bi_sector =
>  			linear_map_sector(ti, bio->bi_iter.bi_sector);
>  }
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 5475081dcbd6..f4507ec20a57 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1176,7 +1176,8 @@ static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,
>  
>  /*
>   * A target may call dm_accept_partial_bio only from the map routine.  It is
> - * allowed for all bio types except REQ_PREFLUSH and REQ_OP_ZONE_RESET.
> + * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET,
> + * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH.
>   *
>   * dm_accept_partial_bio informs the dm that the target only wants to process
>   * additional n_sectors sectors of the bio and the rest of the data should be
> @@ -1629,7 +1630,7 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
>  		ci.sector_count = 0;
>  		error = __send_empty_flush(&ci);
>  		/* dec_pending submits any data associated with flush */
> -	} else if (bio_op(bio) == REQ_OP_ZONE_RESET) {
> +	} else if (bio_is_zone_mgmt_op(bio)) {
>  		ci.bio = bio;
>  		ci.sector_count = 0;
>  		error = __split_and_process_non_flush(&ci);
> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
> index 067ef9242275..fd2458cd1a49 100644
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -398,6 +398,14 @@ static inline bool op_is_zone_mgmt_op(enum req_opf op)
>  	}
>  }
>  
> +/*
> + * Check if the bio is zoned operation.
> + */
> +static inline bool bio_is_zone_mgmt_op(struct bio *bio)
> +{
> +	return op_is_zone_mgmt_op(bio_op(bio));
> +}
> +
>  static inline bool op_is_write(unsigned int op)
>  {
>  	return (op & 1);
> 

Looks good.

Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>

-- 
Damien Le Moal
Western Digital Research