Btrfs: Avoid recursive chunk allocations

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

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 6540095544e843eccbf29c69f219e0557163557d..a589912fdd51aaa2d6ea727352196d02fbf2b53f 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1727,7 +1727,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
                data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
        }
 again:
-       if (root != root->fs_info->extent_root) {
+       if (root->ref_cows) {
                if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
                        ret = do_chunk_alloc(trans, root->fs_info->extent_root,
                                             2 * 1024 * 1024,