filesystems

FILESYSTEMS(5)              Linux Programmer's Manual             FILESYSTEMS(5)



NAME
       filesystems - Linux filesystem types: ext, ext2, ext3, ext4, hpfs,
       iso9660, JFS, minix, msdos, ncpfs nfs, ntfs, proc, Reiserfs, smb, sysv,
       umsdos, vfat, XFS, xiafs

DESCRIPTION
       When, as is customary, the proc filesystem is mounted on /proc, you can
       find in the file /proc/filesystems which filesystems your kernel
       currently supports; see proc(5) for more details.  There is also a legacy
       sysfs(2) system call (whose availability is controlled by the
       CONFIG_SYSFS_SYSCALL kernel build configuration option since Linux 3.15)
       that enables enumeration of the currently available filesystem types
       regardless of /proc availability and/or sanity.

       If you need a currently unsupported filesystem, insert the corresponding
       kernel module or recompile the kernel.

       In order to use a filesystem, you have to mount it; see mount(2) and
       mount(8).

       The following list provides a short description of the available or
       historically available filesystems in the Linux kernel.  See the kernel
       documentation for a comprehensive description of all options and
       limitations.

       ext       is an elaborate extension of the minix filesystem.  It has been
                 completely superseded by the second version of the extended
                 filesystem (ext2) and has been removed from the kernel (in
                 2.1.21).

       ext2      is the high performance disk filesystem used by Linux for fixed
                 disks as well as removable media.  The second extended
                 filesystem was designed as an extension of the extended
                 filesystem (ext).  See ext2(5).

       ext3      is a journaling version of the ext2 filesystem.  It is easy to
                 switch back and forth between ext2 and ext3.  See ext3(5).

       ext4      is a set of upgrades to ext3 including substantial performance
                 and reliability enhancements, plus large increases in volume,
                 file, and directory size limits.  See ext4(5).

       hpfs      is the High Performance Filesystem, used in OS/2.  This
                 filesystem is read-only under Linux due to the lack of
                 available documentation.

       iso9660   is a CD-ROM filesystem type conforming to the ISO 9660
                 standard.

                 High Sierra
                        Linux supports High Sierra, the precursor to the ISO
                        9660 standard for CD-ROM filesystems.  It is
                        automatically recognized within the iso9660 filesystem
                        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 filesystem to a UNIX host, and provide
                        information such as long filenames, UID/GID, POSIX
                        permissions, and devices.  It is automatically
                        recognized within the iso9660 filesystem support under
                        Linux.

       JFS       is a journaling filesystem, developed by IBM, that was
                 integrated into Linux in kernel 2.4.24.

       minix     is the filesystem used in the Minix operating system, the first
                 to run under Linux.  It has a number of shortcomings, including
                 a 64 MB partition size limit, short filenames, and a single
                 timestamp.  It remains useful for floppies and RAM disks.

       msdos     is the filesystem 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.

       ncpfs     is a network filesystem that supports the NCP protocol, used by
                 Novell NetWare.  It was removed from the kernel in 4.17.

                 To use ncpfs, you need special programs, which can be found at
                 ⟨ftp://ftp.gwdg.de/pub/linux/misc/ncpfs⟩.

       nfs       is the network filesystem used to access disks located on
                 remote computers.

       ntfs      is the filesystem native to Microsoft Windows NT, supporting
                 features like ACLs, journaling, encryption, and so on.

       proc      is a pseudo filesystem 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).

       Reiserfs  is a journaling filesystem, designed by Hans Reiser, that was
                 integrated into Linux in kernel 2.4.1.

       smb       is a network filesystem that supports the SMB protocol, used by
                 Windows for Workgroups, Windows NT, and Lan Manager.  See
                 ⟨https://www.samba.org/samba/smbfs/⟩.

       sysv      is an implementation of the System V/Coherent filesystem for
                 Linux.  It implements all of Xenix FS, System V/386 FS, and
                 Coherent FS.

       umsdos    is an extended DOS filesystem used by Linux.  It adds
                 capability for long filenames, UID/GID, POSIX permissions, and
                 special files (devices, named pipes, etc.) under the DOS
                 filesystem, without sacrificing compatibility with DOS.

       tmpfs     is a filesystem whose contents reside in virtual memory.  Since
                 the files on such filesystems typically reside in RAM, file
                 access is extremely fast.  See tmpfs(5).

       vfat      is an extended FAT filesystem used by Microsoft Windows95 and
                 Windows NT.  vfat adds the capability to use long filenames
                 under the MSDOS filesystem.

       XFS       is a journaling filesystem, developed by SGI, that was
                 integrated into Linux in kernel 2.4.20.

       xiafs     was designed and implemented to be a stable, safe filesystem by
                 extending the Minix filesystem code.  It provides the basic
                 most requested features without undue complexity.  The xiafs
                 filesystem is no longer actively developed or maintained.  It
                 was removed from the kernel in 2.1.21.

SEE ALSO
       fuse(4), btrfs(5), ext2(5), ext3(5), ext4(5), nfs(5), proc(5), sysfs(5),
       tmpfs(5), xfs(5), fsck(8), mkfs(8), mount(8)

COLOPHON
       This page is part of release 5.12 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.



Linux                              2020-12-21                     FILESYSTEMS(5)