Btrfs: allow for selecting only completely empty chunks
Enhance balance usage filter by making it possible to balance out only
completely empty chunks. Today, usage filter properly acts on values
from 1 to 99 inclusive, usage=100 selects all chunks, and usage=0
selects no chunks. This commit changes the usage=0 case: the new
meaning is to restripe only completely empty chunks and nothing else.
Suggested-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d778e96..5670765 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2679,7 +2679,7 @@
chunk_used = btrfs_block_group_used(&cache->item);
if (bargs->usage == 0)
- user_thresh = 0;
+ user_thresh = 1;
else if (bargs->usage > 100)
user_thresh = cache->key.offset;
else
