Btrfs: prealloc more blocks for the extent map

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 652cf305a9671740e7051c06053316ef315912e6..62051a36664a001e4836c07ba1ba70b7e9670aff 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -541,7 +541,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
        if (num_blocks == 0) {
                fill_prealloc = 1;
                num_blocks = 1;
-               total_needed = min(level + 2, BTRFS_MAX_LEVEL) * 3;
+               total_needed = (min(level + 1, BTRFS_MAX_LEVEL) + 2) * 3;
        }
        find_search_start(root, 0);
        if (info->block_group_cache &&