Commit 61697a6a authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm: eliminate 'split_discard_bios' flag from DM target interface 



There is no need to have DM core split discards on behalf of a DM target
now that blk_queue_split() handles splitting discards based on the
queue_limits.  A DM target just needs to set max_discard_sectors,
discard_granularity, etc, in queue_limits.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 568c73a3

drivers/md/dm-cache-target.c

+0 −1
Original line number Diff line number Diff line
@@ -2496,7 +2496,6 @@ static int cache_create(struct cache_args *ca, struct cache **result) 


	ti->num_discard_bios = 1;

	ti->discards_supported = true;

	ti->split_discard_bios = false;



	ti->per_io_data_size = sizeof(struct per_bio_data);

drivers/md/dm-raid.c

+9 −5
Original line number Diff line number Diff line
@@ -2986,11 +2986,6 @@ static void configure_discard_support(struct raid_set *rs) 
		}

	}



	/*

	 * RAID1 and RAID10 personalities require bio splitting,

	 * RAID0/4/5/6 don't and process large discard bios properly.

	 */

	ti->split_discard_bios = !!(rs_is_raid1(rs) || rs_is_raid10(rs));

	ti->num_discard_bios = 1;

}
@@ -3747,6 +3742,15 @@ static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) 


	blk_limits_io_min(limits, chunk_size);

	blk_limits_io_opt(limits, chunk_size * mddev_data_stripes(rs));



	/*

	 * RAID1 and RAID10 personalities require bio splitting,

	 * RAID0/4/5/6 don't and process large discard bios properly.

	 */

	if (rs_is_raid1(rs) || rs_is_raid10(rs)) {

		limits->discard_granularity = chunk_size;

		limits->max_discard_sectors = chunk_size;

	}

}



static void raid_postsuspend(struct dm_target *ti)

drivers/md/dm-thin.c

+0 −1
Original line number Diff line number Diff line
@@ -4227,7 +4227,6 @@ static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv) 
	if (tc->pool->pf.discard_enabled) {

		ti->discards_supported = true;

		ti->num_discard_bios = 1;

		ti->split_discard_bios = false;

	}



	mutex_unlock(&dm_thin_pool_table.mutex);

drivers/md/dm-zoned-target.c

+0 −1
Original line number Diff line number Diff line
@@ -727,7 +727,6 @@ static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv) 
	ti->per_io_data_size = sizeof(struct dmz_bioctx);

	ti->flush_supported = true;

	ti->discards_supported = true;

	ti->split_discard_bios = true;



	/* The exposed capacity is the number of chunks that can be mapped */

	ti->len = (sector_t)dmz_nr_chunks(dmz->metadata) << dev->zone_nr_sectors_shift;

drivers/md/dm.c

+6 −19
Original line number Diff line number Diff line
@@ -1478,17 +1478,10 @@ static unsigned get_num_write_zeroes_bios(struct dm_target *ti) 
	return ti->num_write_zeroes_bios;

}



typedef bool (*is_split_required_fn)(struct dm_target *ti);



static bool is_split_required_for_discard(struct dm_target *ti)

{

	return ti->split_discard_bios;

}



static int __send_changing_extent_only(struct clone_info *ci, struct dm_target *ti,

				       unsigned num_bios, bool is_split_required)

				       unsigned num_bios)

{

	unsigned len;

	unsigned len = ci->sector_count;



	/*

	 * Even though the device advertised support for this type of
@@ -1499,11 +1492,6 @@ static int __send_changing_extent_only(struct clone_info *ci, struct dm_target * 
	if (!num_bios)

		return -EOPNOTSUPP;



	if (!is_split_required)

		len = min((sector_t)ci->sector_count, max_io_len_target_boundary(ci->sector, ti));

	else

		len = min((sector_t)ci->sector_count, max_io_len(ci->sector, ti));



	__send_duplicate_bios(ci, ti, num_bios, &len);



	ci->sector += len;
@@ -1514,23 +1502,22 @@ static int __send_changing_extent_only(struct clone_info *ci, struct dm_target * 


static int __send_discard(struct clone_info *ci, struct dm_target *ti)

{

	return __send_changing_extent_only(ci, ti, get_num_discard_bios(ti),

					   is_split_required_for_discard(ti));

	return __send_changing_extent_only(ci, ti, get_num_discard_bios(ti));

}



static int __send_secure_erase(struct clone_info *ci, struct dm_target *ti)

{

	return __send_changing_extent_only(ci, ti, get_num_secure_erase_bios(ti), false);

	return __send_changing_extent_only(ci, ti, get_num_secure_erase_bios(ti));

}



static int __send_write_same(struct clone_info *ci, struct dm_target *ti)

{

	return __send_changing_extent_only(ci, ti, get_num_write_same_bios(ti), false);

	return __send_changing_extent_only(ci, ti, get_num_write_same_bios(ti));

}



static int __send_write_zeroes(struct clone_info *ci, struct dm_target *ti)

{

	return __send_changing_extent_only(ci, ti, get_num_write_zeroes_bios(ti), false);

	return __send_changing_extent_only(ci, ti, get_num_write_zeroes_bios(ti));

}



static bool is_abnormal_io(struct bio *bio)

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