Btrfs: Enable btree balancing on old kernels again

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

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 373374340e9b7cfb73e6cae64261b590509454ca..d8a256d3c83a4123c9fd67f7f88bb7d06578b821 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1719,7 +1719,6 @@ void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
         * looks as though older kernels can get into trouble with
         * this code, they end up stuck in balance_dirty_pages forever
         */
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
        struct extent_io_tree *tree;
        u64 num_dirty;
        u64 start = 0;
@@ -1735,9 +1734,7 @@ void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
                balance_dirty_pages_ratelimited_nr(
                                   root->fs_info->btree_inode->i_mapping, 1);
        }
-#else
        return;
-#endif
 }
 
 void btrfs_set_buffer_defrag(struct extent_buffer *buf)