[PATCH 07/14] dm_space_map: remove entries from the ref_count tree if they're no longer needed

[Joe Thornber <ejt@redhat.com>]

Enhancement.

Ref counts are stored in two places: a bitmap if the ref_count is
below 3, or a btree of uint32_t if 3 or above.

When a ref_count that was above 3 drops below we can remove it from
the tree and save some metadata space.  This removal was commented out
before because I was unsure why this was causing under populated btree
nodes.  Earlier patches have fixed this issue.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
 drivers/md/persistent-data/dm-space-map-common.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/md/persistent-data/dm-space-map-common.c b/drivers/md/persistent-data/dm-space-map-common.c
index df2494c..ff3beed 100644
--- a/drivers/md/persistent-data/dm-space-map-common.c
+++ b/drivers/md/persistent-data/dm-space-map-common.c
@@ -405,8 +405,6 @@ int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
 		if (r < 0)
 			return r;
 
-#if 0
-		/* FIXME: dm_btree_remove doesn't handle this yet */
 		if (old > 2) {
 			r = dm_btree_remove(&ll->ref_count_info,
 					    ll->ref_count_root,
@@ -414,7 +412,6 @@ int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
 			if (r)
 				return r;
 		}
-#endif
 
 	} else {
 		__le32 le_rc = cpu_to_le32(ref_count);
-- 
1.7.9.1