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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 02:42:50 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 02:42:50 +0000
commit8cb83eee5a58b1fad74c34094ce3afb9e430b5a4 (patch)
treea9b2e7baeca1be40eb734371e3c8b11b02294497 /sys-utils/fstab.5
parentInitial commit. (diff)
downloadutil-linux-8cb83eee5a58b1fad74c34094ce3afb9e430b5a4.tar.xz
util-linux-8cb83eee5a58b1fad74c34094ce3afb9e430b5a4.zip
Adding upstream version 2.33.1.upstream/2.33.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+.\" Copyright (c) 1980, 1989, 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" This product includes software developed by the University of
+.\" California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\" may be used to endorse or promote products derived from this software
+.\" without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" @(#)fstab.5 6.5 (Berkeley) 5/10/91
+.\"
+.TH FSTAB 5 "February 2015" "util-linux" "File Formats"
+.SH NAME
+fstab \- static information about the filesystems
+.SH SYNOPSIS
+.I /etc/fstab
+.SH DESCRIPTION
+The file
+.B fstab
+contains descriptive information about the filesystems the system can mount.
+.B fstab
+is only read by programs, and not written; it is the duty of the system
+administrator to properly create and maintain this file. The order of records in
+.B fstab
+is important because
+.BR fsck (8),
+.BR mount (8),
+and
+.BR umount (8)
+sequentially iterate through
+.B fstab
+doing their thing.
+
+Each filesystem is described on a separate line.
+Fields on each line are separated by tabs or spaces.
+Lines starting with '#' are comments. Blank lines are ignored.
+.PP
+The following is a typical example of an
+.B fstab
+entry:
+.sp
+.RS 7
+LABEL=t-home2 /home ext4 defaults,auto_da_alloc 0 2
+.RE
+
+.B The first field
+.RI ( fs_spec ).
+.RS
+This field describes the block special device or
+remote filesystem to be mounted.
+.LP
+For ordinary mounts, it will hold (a link to) a block special
+device node (as created by
+.BR mknod (8))
+for the device to be mounted, like `/dev/cdrom' or `/dev/sdb7'.
+For NFS mounts, this field is <host>:<dir>, e.g., `knuth.aeb.nl:/'.
+For filesystems with no storage, any string can be used, and will show up in
+.BR df (1)
+output, for example. Typical usage is `proc' for procfs; `mem', `none',
+or `tmpfs' for tmpfs. Other special filesystems, like udev and sysfs,
+are typically not listed in
+.BR fstab .
+.LP
+LABEL=<label> or UUID=<uuid> may be given instead of a device name.
+This is the recommended method, as device names are often a coincidence
+of hardware detection order, and can change when other disks are added or removed.
+For example, `LABEL=Boot' or `UUID=3e6be9de\%-8139\%-11d1\%-9106\%-a43f08d823a6'.
+(Use a filesystem-specific tool like
+.BR e2label (8),
+.BR xfs_admin (8),
+or
+.BR fatlabel (8)
+to set LABELs on filesystems).
+
+It's also possible to use PARTUUID= and PARTLABEL=. These partitions identifiers
+are supported for example for GUID Partition Table (GPT).
+
+See
+.BR mount (8),
+.BR blkid (8)
+or
+.BR lsblk (8)
+for more details about device identifiers.
+
+.LP
+Note that
+.BR mount (8)
+uses UUIDs as strings. The string representation of the UUID should be based on
+lower case characters.
+.RE
+
+.B The second field
+.RI ( fs_file ).
+.RS
+This field describes the mount point (target) for the filesystem. For swap partitions, this
+field should be specified as `none'. If the name of the mount point
+contains spaces or tabs these can be escaped as `\\040' and '\\011'
+respectively.
+.RE
+
+.B The third field
+.RI ( fs_vfstype ).
+.RS
+This field describes the type of the filesystem. Linux supports many
+filesystem types: ext4, xfs, btrfs, f2fs, vfat, ntfs, hfsplus,
+tmpfs, sysfs, proc, iso9660, udf, squashfs, nfs, cifs, and many more.
+For more details, see
+.BR mount (8).
+
+An entry
+.I swap
+denotes a file or partition to be used
+for swapping, cf.\&
+.BR swapon (8).
+An entry
+.I none
+is useful for bind or move mounts.
+
+More than one type may be specified in a comma-separated list.
+
+.BR mount (8)
+and
+.BR umount (8)
+support filesystem
+.IR subtypes .
+The subtype is defined by '.subtype' suffix. For
+example 'fuse.sshfs'. It's recommended to use subtype notation rather than add
+any prefix to the first fstab field (for example 'sshfs#example.com' is
+deprecated).
+.RE
+
+.B The fourth field
+.RI ( fs_mntops ).
+.RS
+This field describes the mount options associated with the filesystem.
+
+It is formatted as a comma-separated list of options.
+It contains at least the type of mount
+.RB ( ro
+or
+.BR rw ),
+plus any additional options appropriate to the filesystem
+type (including performance-tuning options).
+For details, see
+.BR mount (8)
+or
+.BR swapon (8).
+
+Basic filesystem-independent options are:
+.TP
+.B defaults
+use default options: rw, suid, dev, exec, auto, nouser, and async.
+.TP
+.B noauto
+do not mount when "mount -a" is given (e.g., at boot time)
+.TP
+.B user
+allow a user to mount
+.TP
+.B owner
+allow device owner to mount
+.TP
+.B comment
+or
+.B x-<name>
+for use by fstab-maintaining programs
+.TP
+.B nofail
+do not report errors for this device if it does not exist.
+.RE
+
+.B The fifth field
+.RI ( fs_freq ).
+.RS
+This field is used by
+.BR dump (8)
+to determine which filesystems need to be dumped.
+Defaults to zero (don't dump) if not present.
+.RE
+
+.B The sixth field
+.RI ( fs_passno ).
+.RS
+This field is used by
+.BR fsck (8)
+to determine the order in which filesystem checks are done at
+boot time. The root filesystem should be specified with a
+.I fs_passno
+of 1. Other filesystems should have a
+.I fs_passno
+of 2. Filesystems within a drive will be checked sequentially, but
+filesystems on different drives will be checked at the same time to utilize
+parallelism available in the hardware.
+Defaults to zero (don't fsck) if not present.
+
+.SH NOTES
+The proper way to read records from
+.B fstab
+is to use the routines
+.BR getmntent (3)
+or
+.BR libmount .
+
+The keyword
+.B ignore
+as a filesystem type (3rd field) is no longer supported by the pure
+libmount based mount utility (since util-linux v2.22).
+
+.SH FILES
+.IR /etc/fstab ,
+.I <fstab.h>
+.SH "SEE ALSO"
+.BR getmntent (3),
+.BR fs (5),
+.BR findmnt (8),
+.BR mount (8),
+.BR swapon (8)
+.SH HISTORY
+The ancestor of this
+.B fstab
+file format appeared in 4.0BSD.
+.\" But without comment convention, and options and vfs_type.
+.\" Instead there was a type rw/ro/rq/sw/xx, where xx is the present 'ignore'.
+.SH AVAILABILITY
+This man page is part of the util-linux package and is available from
+https://www.kernel.org/pub/linux/utils/util-linux/.