Commit 13f6facf authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm: allow targets to require splitting WRITE_ZEROES and SECURE_ERASE 



Introduce max_write_zeroes_granularity and
max_secure_erase_granularity flags in the dm_target struct.

If a target sets these then DM core will split IO of these operation
types accordingly (in terms of max_write_zeroes_sectors and
max_secure_erase_sectors respectively).

Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
parent 3664ff82

drivers/md/dm.c

+6 −4
Original line number Diff line number Diff line
@@ -1614,21 +1614,23 @@ static blk_status_t __process_abnormal_io(struct clone_info *ci, 
{

	unsigned int num_bios = 0;

	unsigned int max_granularity = 0;

	struct queue_limits *limits = dm_get_queue_limits(ti->table->md);



	switch (bio_op(ci->bio)) {

	case REQ_OP_DISCARD:

		num_bios = ti->num_discard_bios;

		if (ti->max_discard_granularity) {

			struct queue_limits *limits =

				dm_get_queue_limits(ti->table->md);

		if (ti->max_discard_granularity)

			max_granularity = limits->max_discard_sectors;

		}

		break;

	case REQ_OP_SECURE_ERASE:

		num_bios = ti->num_secure_erase_bios;

		if (ti->max_secure_erase_granularity)

			max_granularity = limits->max_secure_erase_sectors;

		break;

	case REQ_OP_WRITE_ZEROES:

		num_bios = ti->num_write_zeroes_bios;

		if (ti->max_write_zeroes_granularity)

			max_granularity = limits->max_write_zeroes_sectors;

		break;

	default:

		break;

include/linux/device-mapper.h

+14 −2
Original line number Diff line number Diff line
@@ -359,11 +359,23 @@ struct dm_target { 
	bool discards_supported:1;



	/*

	 * Set if this target requires that discards be split on both

	 * 'discard_granularity' and 'max_discard_sectors' boundaries.

	 * Set if this target requires that discards be split on

	 * 'max_discard_sectors' boundaries.

	 */

	bool max_discard_granularity:1;



	/*

	 * Set if this target requires that secure_erases be split on

	 * 'max_secure_erase_sectors' boundaries.

	 */

	bool max_secure_erase_granularity:1;



	/*

	 * Set if this target requires that write_zeroes be split on

	 * 'max_write_zeroes_sectors' boundaries.

	 */

	bool max_write_zeroes_granularity:1;



	/*

	 * Set if we need to limit the number of in-flight bios when swapping.

	 */