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| author | Joe Thornber <ejt@redhat.com> | 2017-05-15 13:45:40 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-25 13:44:33 (GMT) |
| commit | f2bb8bcbc09dfe32138efc44105be9a58fad5cef (patch) | |
| tree | 02229e6c77d7cd26d0ce2be920dc7918a629cedc /drivers/md/persistent-data | |
| parent | cc681811a92cd7cae589b5026b3d9d3bb1850365 (diff) | |
| download | linux-f2bb8bcbc09dfe32138efc44105be9a58fad5cef.tar.xz | |
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/md/persistent-data')
| -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 ebb280a..32adf6b 100644 --- a/drivers/md/persistent-data/dm-space-map-disk.c +++ b/drivers/md/persistent-data/dm-space-map-disk.c @@ -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) |