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Commit 0377a07c authored by Joe Thornber's avatar Joe Thornber Committed by Mike Snitzer
Browse files

dm space map disk: fix some book keeping in the disk space map 



When decrementing the reference count for a block, the free count wasn't
being updated if the reference count went to zero.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 91bcdb92

drivers/md/persistent-data/dm-space-map-disk.c

+14 −1
Original line number Diff line number Diff line
@@ -142,10 +142,23 @@ static int sm_disk_inc_block(struct dm_space_map *sm, dm_block_t b) 


static int sm_disk_dec_block(struct dm_space_map *sm, dm_block_t b)

{

	int r;

	uint32_t old_count;

	enum allocation_event ev;

	struct sm_disk *smd = container_of(sm, struct sm_disk, sm);



	return sm_ll_dec(&smd->ll, b, &ev);

	r = sm_ll_dec(&smd->ll, b, &ev);

	if (!r && (ev == SM_FREE)) {

		/*

		 * It's only free if it's also free in the last

		 * transaction.

		 */

		r = sm_ll_lookup(&smd->old_ll, b, &old_count);

		if (!r && !old_count)

			smd->nr_allocated_this_transaction--;

	}



	return r;

}



static int sm_disk_new_block(struct dm_space_map *sm, dm_block_t *b)