Interoperatibility Between File System APIs
As all filesystems (at least the disk ones) need equivalent functions provided by the kernel, it is possible to easily port a filesystem code from one API to another, even if they are of different types.
For example, the ext2 driver for OS/2 is simply a wrapper from the Linux's VFS to the OS/2's IFS and the Linux's ext2 kernel-based, and the HFS driver for OS/2 is a port of the hfsutils to the OS/2's IFS. There also exists a project that uses a Windows NT IFS driver for making NTFS work under Linux.
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