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authorJoe Thornber <ejt@redhat.com>2012-03-28 18:41:27 +0100
committerAlasdair G Kergon <agk@redhat.com>2012-03-28 18:41:27 +0100
commit71fd5ae25d88841c08d5bbea90c0f0a12ca05509 (patch)
tree763ec9657bd25e4d42f1f6774faa65166364eede /drivers/md/persistent-data/dm-space-map-common.c
parent905e51b39a5558706a6ed883fe104de3d417050b (diff)
downloadlinaro-lsk-71fd5ae25d88841c08d5bbea90c0f0a12ca05509.tar.gz
dm persistent data: remove space map ref_count entries if redundant
Save space by removing entries from the space map ref_count tree if they're no longer needed. 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> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/persistent-data/dm-space-map-common.c')
-rw-r--r--drivers/md/persistent-data/dm-space-map-common.c3
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 df2494c06cd..ff3beed6ad2 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);