Commit 9b4b5a79 authored by Milan Broz's avatar Milan Broz Committed by Mike Snitzer
Browse files

dm table: add flag to allow target to handle its own integrity metadata 



Add DM_TARGET_INTEGRITY flag that specifies bio integrity metadata is
not inherited but implemented in the target itself.

Signed-off-by: default avatarMilan Broz <gmazyland@gmail.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent b29d4986

drivers/md/dm-table.c

+11 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ struct dm_table { 
	bool integrity_supported:1;

	bool singleton:1;

	bool all_blk_mq:1;

	unsigned integrity_added:1;



	/*

	 * Indicates the rw permissions for the new logical
@@ -725,6 +726,9 @@ int dm_table_add_target(struct dm_table *t, const char *type, 
		t->immutable_target_type = tgt->type;

	}



	if (dm_target_has_integrity(tgt->type))

		t->integrity_added = 1;



	tgt->table = t;

	tgt->begin = start;

	tgt->len = len;
@@ -1168,6 +1172,10 @@ static int dm_table_register_integrity(struct dm_table *t) 
	struct mapped_device *md = t->md;

	struct gendisk *template_disk = NULL;



	/* If target handles integrity itself do not register it here. */

	if (t->integrity_added)

		return 0;



	template_disk = dm_table_get_integrity_disk(t);

	if (!template_disk)

		return 0;
@@ -1394,6 +1402,9 @@ static void dm_table_verify_integrity(struct dm_table *t) 
{

	struct gendisk *template_disk = NULL;



	if (t->integrity_added)

		return;



	if (t->integrity_supported) {

		/*

		 * Verify that the original integrity profile

include/linux/device-mapper.h

+6 −0
Original line number Diff line number Diff line
@@ -221,6 +221,12 @@ struct target_type { 
 */

typedef unsigned (*dm_num_write_bios_fn) (struct dm_target *ti, struct bio *bio);



/*

 * A target implements own bio data integrity.

 */

#define DM_TARGET_INTEGRITY		0x00000010

#define dm_target_has_integrity(type)	((type)->features & DM_TARGET_INTEGRITY)



struct dm_target {

	struct dm_table *table;

	struct target_type *type;