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

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
......@@ -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)
......
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