21.12 Converting an Ext2, Ext3, or Ext4 File System to a Btrfs File System

You can use the btrfs-convert utility to convert an ext2, ext3, or ext4 file system to btrfs. The utility preserves an image of the original file system in a snapshot named ext2_saved. This snapshot allows you to roll back the conversion, even if you have made changes to the btrfs file system.

Note

You cannot convert the root file system or a bootable partition, such as /boot, to btrfs.