Commit 61706974 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Mike Snitzer
Browse files

dm: introduce the target flag mempool_needs_integrity 



This commit introduces the dm target flag mempool_needs_integrity. When
the flag is set, device mapper will call bioset_integrity_create on it's
bio sets. The target can then call bio_integrity_alloc on the bios
allocated from the table's mempool.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
parent d176fadb

drivers/md/dm-table.c

+5 −2
Original line number Diff line number Diff line
@@ -1050,6 +1050,7 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device * 
	unsigned int min_pool_size = 0, pool_size;

	struct dm_md_mempools *pools;

	unsigned int bioset_flags = 0;

	bool mempool_needs_integrity = t->integrity_supported;



	if (unlikely(type == DM_TYPE_NONE)) {

		DMERR("no table type is set, can't allocate mempools");
@@ -1074,6 +1075,8 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device * 


		per_io_data_size = max(per_io_data_size, ti->per_io_data_size);

		min_pool_size = max(min_pool_size, ti->num_flush_bios);



		mempool_needs_integrity |= ti->mempool_needs_integrity;

	}

	pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);

	front_pad = roundup(per_io_data_size,
@@ -1083,13 +1086,13 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device * 
		__alignof__(struct dm_io)) + DM_IO_BIO_OFFSET;

	if (bioset_init(&pools->io_bs, pool_size, io_front_pad, bioset_flags))

		goto out_free_pools;

	if (t->integrity_supported &&

	if (mempool_needs_integrity &&

	    bioset_integrity_create(&pools->io_bs, pool_size))

		goto out_free_pools;

init_bs:

	if (bioset_init(&pools->bs, pool_size, front_pad, 0))

		goto out_free_pools;

	if (t->integrity_supported &&

	if (mempool_needs_integrity &&

	    bioset_integrity_create(&pools->bs, pool_size))

		goto out_free_pools;

include/linux/device-mapper.h

+6 −0
Original line number Diff line number Diff line
@@ -405,6 +405,12 @@ struct dm_target { 
	 * support it.

	 */

	bool flush_bypasses_map:1;



	/*

	 * Set if the target calls bio_integrity_alloc on bios received

	 * in the map method.

	 */

	bool mempool_needs_integrity:1;

};



void *dm_per_bio_data(struct bio *bio, size_t data_size);