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FILESYSTEMS(5) Linux Programmer's Manual FILESYSTEMS(5)
NAME
filesystems - Linux file-system types: minix, ext, ext2, ext3, Reiserfs, XFS, JFS, xia,
msdos, umsdos, vfat, proc, nfs, iso9660, hpfs, sysv, smb, ncpfs
DESCRIPTION
When, as is customary, the proc file system is mounted on /proc, you can find in the file
/proc/filesystems which file systems your kernel currently supports. If you need a
currently unsupported one, insert the corresponding module or recompile the kernel.
In order to use a file system, you have to mount it; see mount(8).
Below a short description of a few of the available file systems.
minix is the file system used in the Minix operating system, the first to run under
Linux. It has a number of shortcomings: a 64MB partition size limit, short
filenames, a single timestamp, etc. It remains useful for floppies and RAM
disks.
ext is an elaborate extension of the minix file system. It has been completely
superseded by the second version of the extended file system (ext2) and has been
removed from the kernel (in 2.1.21).
ext2 is the high performance disk file system used by Linux for fixed disks as well
as removable media. The second extended file system was designed as an
extension of the extended file system (ext). ext2 offers the best performance
(in terms of speed and CPU usage) of the file systems supported under Linux.
ext3 is a journaling version of the ext2 file system. It is easy to switch back and
forth between ext2 and ext3.
Reiserfs is a journaling file system, designed by Hans Reiser, that was integrated into
Linux in kernel 2.4.1.
XFS is a journaling file system, developed by SGI, that was integrated into Linux in
kernel 2.4.20.
JFS is a journaling file system, developed by IBM, that was integrated into Linux in
kernel 2.4.24.
xiafs was designed and implemented to be a stable, safe file system by extending the
Minix file system code. It provides the basic most requested features without
undue complexity. The xia file system is no longer actively developed or
maintained. It was removed from the kernel in 2.1.21.
msdos is the file system used by DOS, Windows, and some OS/2 computers. msdos
filenames can be no longer than 8 characters, followed by an optional period and
3 character extension.
umsdos is an extended DOS file system used by Linux. It adds capability for long
filenames, UID/GID, POSIX permissions, and special files (devices, named pipes,
etc.) under the DOS file system, without sacrificing compatibility with DOS.
vfat is an extended DOS file system used by Microsoft Windows95 and Windows NT. VFAT
adds the capability to use long filenames under the MSDOS file system.
proc is a pseudo file system which is used as an interface to kernel data structures
rather than reading and interpreting /dev/kmem. In particular, its files do not
take disk space. See proc(5).
iso9660 is a CD-ROM file system type conforming to the ISO 9660 standard.
High Sierra
Linux supports High Sierra, the precursor to the ISO 9660 standard for
CD-ROM file systems. It is automatically recognized within the iso9660
file-system support under Linux.
Rock Ridge
Linux also supports the System Use Sharing Protocol records specified by
the Rock Ridge Interchange Protocol. They are used to further describe
the files in the iso9660 file system to a Unix host, and provide
information such as long filenames, UID/GID, POSIX permissions, and
devices. It is automatically recognized within the iso9660 file-system
support under Linux.
hpfs is the High Performance Filesystem, used in OS/2. This file system is read-only
under Linux due to the lack of available documentation.
sysv is an implementation of the SystemV/Coherent file system for Linux. It
implements all of Xenix FS, SystemV/386 FS, and Coherent FS.
nfs is the network file system used to access disks located on remote computers.
smb is a network file system that supports the SMB protocol, used by Windows for
Workgroups, Windows NT, and Lan Manager.
To use smb fs, you need a special mount program, which can be found in the
ksmbfs package, found at
ftp://sunsite.unc.edu/pub/Linux/system/Filesystems/smbfs.
ncpfs is a network file system that supports the NCP protocol, used by Novell NetWare.
To use ncpfs, you need special programs, which can be found at
ftp://linux01.gwdg.de/pub/ncpfs.
SEE ALSO
proc(5), fsck(8), mkfs(8), mount(8)
COLOPHON
This page is part of release 3.05 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
http://www.kernel.org/doc/man-pages/.
Linux 2007-12-14 FILESYSTEMS(5)
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