diff options
| author | Joe Thornber <ejt@redhat.com> | 2017-05-15 09:45:40 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-25 14:17:57 +0200 |
| commit | 17f2c0ebba6b9d9eb9ed6082290f36ad9350f149 (patch) | |
| tree | 70bb28788f246faaf9f43b2541234a8922d4bce5 /drivers | |
| parent | 986e0919703d832f283666ef48940d60078f4618 (diff) | |
dm space map disk: fix some book keeping in the disk space map
commit 0377a07c7a035e0d033cd8b29f0cb15244c0916a upstream.
When decrementing the reference count for a block, the free count wasn't
being updated if the reference count went to zero.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/persistent-data/dm-space-map-disk.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/md/persistent-data/dm-space-map-disk.c b/drivers/md/persistent-data/dm-space-map-disk.c index cfbf9617e465..8d0a6a23438b 100644 --- a/drivers/md/persistent-data/dm-space-map-disk.c +++ b/drivers/md/persistent-data/dm-space-map-disk.c @@ -140,10 +140,23 @@ 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) |