BTRFS_FS_NEED_ZONE_FINISH
wait_on_bit_io(&inode->root->fs_info->flags, BTRFS_FS_NEED_ZONE_FINISH,
BTRFS_FS_NEED_ZONE_FINISH,
clear_and_wake_up_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
if (test_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags))
set_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);