The Ext2 filesystem provides transparent access to Linux disk partitions.
The fs-ext2.so implementation supports the standard set of features found in Ext2 versions 0 and 1.
Sparse file support is included in order to be compatible with existing Linux partitions. Other filesystems can only be “stacked” read-only on top of sparse files. There are no such restrictions on normal files.
If an Ext2 filesystem isn't unmounted properly, a filesystem checker is usually responsible for cleaning up the next time the filesystem is mounted. Although the fs-ext2.so module is equipped to perform a quick test, it automatically mounts the filesystem as read-only if it detects any significant problems (which should be fixed using a filesystem checker).