Btrfs: properly check free space for tree balancing
btrfs_insert_empty_items takes the space needed by the btrfs_item
structure into account when calculating the required free space.
So the tree balancing code shouldn't add sizeof(struct btrfs_item)
to the size when checking the free space. This patch removes these
superfluous additions.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 6ac1b7f..33eee25 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -374,13 +374,8 @@
if (found_size > item_size) {
btrfs_truncate_item(trans, root, path, item_size, 1);
} else if (found_size < item_size) {
- ret = btrfs_del_item(trans, root,
- path);
- BUG_ON(ret);
-
- btrfs_release_path(root, path);
- ret = btrfs_insert_empty_item(trans,
- root, path, key, item_size);
+ ret = btrfs_extend_item(trans, root, path,
+ item_size - found_size);
BUG_ON(ret);
}
} else if (ret) {