"Linux supports several different file systems. Some are specialized network file systems or file systems developed for other operating systems, but a surprising number may be used as Linux native file systems--you can place your Linux root (/) and system directories on such file systems. Currently, file systems in this category include ext2, ext3, ReiserFS, XFS, and Journaled File System (JFS). However, file system design and development are ongoing, and new file systems are on the horizon.
"Perhaps the most important file system currently under development for Linux is ext4--the fourth incarnation of the original extended file system (ext or extfs) developed exclusively for Linux. Given its heritage, it seems likely that ext4 will become an important standard file system (perhaps the standard file system) for Linux in the not-too-distant future..."
