367 lines
11 KiB
Groff
367 lines
11 KiB
Groff
.\" Copyright (c) 1980, 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mount.8 8.8 (Berkeley) 6/16/94
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.\" $Id: mount.8,v 1.23 1998/07/09 05:49:58 jkoshy Exp $
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.\"
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.Dd June 16, 1994
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.Dt MOUNT 8
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.Os BSD 4
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.Sh NAME
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.Nm mount
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.Nd mount file systems
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.Sh SYNOPSIS
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.Nm mount
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.Op Fl adfpruvw
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.Op Fl t Ar ufs | lfs | external_type
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.Nm mount
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.Op Fl dfpruvw
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.Ar special | node
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.Nm mount
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.Op Fl dfpruvw
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.Op Fl o Ar options
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.Op Fl t Ar ufs | lfs | external_type
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.Ar special node
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.Sh DESCRIPTION
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The
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.Nm
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command
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calls the
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.Xr mount 2
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system call to prepare and graft a
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.Ar "special device"
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or the remote node (rhost:path) on to the file system tree at the point
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.Ar node .
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If either
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.Ar special
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or
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.Ar node
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are not provided, the appropriate information is taken from the
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.Xr fstab 5
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file.
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.Pp
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The system maintains a list of currently mounted file systems.
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If no arguments are given to
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.Nm mount ,
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this list is printed.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl a
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All the filesystems described in
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.Xr fstab 5
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are mounted.
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Exceptions are those marked as ``noauto'', excluded by the
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.Fl t
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flag (see below), or if they are already mounted (except the
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root filesystem which is always remounted to preserve
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traditional single user mode behavior).
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.It Fl d
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Causes everything to be done except for the actual system call.
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This option is useful in conjunction with the
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.Fl v
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flag to
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determine what the
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.Nm
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command is trying to do.
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.It Fl f
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Forces the revocation of write access when trying to downgrade
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a filesystem mount status from read-write to read-only. Also
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forces the R/W mount of an unclean filesystem (dangerous; use with
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caution).
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.It Fl o
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Options are specified with a
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.Fl o
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flag followed by a comma separated string of options.
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The following options are available:
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.Bl -tag -width indent
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.It async
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All
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.Tn I/O
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to the file system should be done asynchronously.
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This is a
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.Em dangerous
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flag to set,
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and should not be used unless you are prepared to recreate the file
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system should your system crash.
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.It force
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The same as
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.Fl f ;
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forces the revocation of write access when trying to downgrade
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a filesystem mount status from read-write to read-only. Also
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forces the R/W mount of an unclean filesystem (dangerous; use with caution).
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.It noatime
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Do not update the file access time when reading from a file. This option
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is useful on filesystems where there are large numbers of files and
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performance is more critical than updating the file access time (which is
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rarely ever important). This option is currently only supported on local
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filesystems.
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.It noauto
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This filesystem should be skipped when mount is run with the
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.Fl a
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flag.
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.It noclusterr
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Disable read clustering.
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.It noclusterw
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Disable write clustering.
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.It nodev
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Do not interpret character or block special devices on the file system.
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This option is useful for a server that has file systems containing
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special devices for architectures other than its own.
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.It noexec
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Do not allow execution of any binaries on the mounted file system.
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This option is useful for a server that has file systems containing
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binaries for architectures other than its own.
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.It nosuid
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Do not allow set-user-identifier or set-group-identifier bits to take effect.
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Note: this option is worthless if a public available suid or sgid
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wrapper like
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.Xr suidperl 1
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is installed on your system.
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.It nosymfollow
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Do not follow symlinks
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on the mounted file system.
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.It rdonly
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The same as
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.Fl r ;
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mount the file system read-only (even the super-user may not write it).
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.It sync
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All
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.Tn I/O
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to the file system should be done synchronously.
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.It suiddir
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A directory on the mounted filesystem will respond to the SUID bit
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being set, by setting the owner of any new files to be the same
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as the owner of the directory.
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New directories will inherit the bit from their parents.
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Execute bits are removed from
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the file, and it will not be given to root.
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.Pp
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This feature is designed for use on fileservers serving PC users via
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ftp, SAMBA, or netatalk. It provides security holes for shell users and as
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such should not be used on shell machines, especially on home directories.
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This option requires the SUIDDIR
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option in the kernel to work. Only UFS filesystems support this option.
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See
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.Xr chmod 2
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for more information.
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.It update
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The same as
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.Fl u ;
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indicate that the status of an already mounted file system should be changed.
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.It union
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Causes the namespace at the mount point to appear as the union
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of the mounted filesystem root and the existing directory.
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Lookups will be done in the mounted filesystem first.
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If those operations fail due to a non-existent file the underlying
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directory is then accessed.
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All creates are done in the mounted filesystem.
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.El
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.Pp
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Any additional options specific to a filesystem type that is not
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one of the internally known types (see the
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.Fl t
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option) may be passed as a comma separated list; these options are
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distinguished by a leading
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.Dq \&-
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(dash).
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Options that take a value are specified using the syntax -option=value.
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For example, the
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.Nm
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command:
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.Bd -literal -offset indent
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mount -t mfs -o nosuid,-N,-s=4000 /dev/dk0b /tmp
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.Ed
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.Pp
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causes
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.Nm
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to execute the equivalent of:
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.Bd -literal -offset indent
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/sbin/mount_mfs -o nosuid -N -s 4000 /dev/dk0b /tmp
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.Ed
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.It Fl p
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Print mount information in fstab format. Implies also the
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.Fl v
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option.
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.It Fl r
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The file system is to be mounted read-only.
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Mount the file system read-only (even the super-user may not write it).
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The same as the
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.Dq rdonly
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argument to the
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.Fl o
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option.
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.It Fl t Ar "ufs \\*(Ba lfs \\*(Ba external type"
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The argument following the
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.Fl t
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is used to indicate the file system type.
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The type
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.Ar ufs
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is the default.
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The
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.Fl t
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option can be used
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to indicate that the actions should only be taken on
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filesystems of the specified type.
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More than one type may be specified in a comma separated list.
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The list of filesystem types can be prefixed with
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.Dq no
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to specify the filesystem types for which action should
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.Em not
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be taken.
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For example, the
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.Nm
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command:
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.Bd -literal -offset indent
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mount -a -t nonfs,mfs
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.Ed
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.Pp
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mounts all filesystems except those of type
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.Tn NFS
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and
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.Tn MFS .
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.Pp
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If the type is not one of the internally known types,
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.Nm
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will attempt to execute a program in
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.Pa /sbin/mount_ Ns Em XXX
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where
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.Em XXX
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is replaced by the type name.
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For example, nfs filesystems are mounted by the program
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.Pa /sbin/mount_nfs .
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.Pp
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Most filesystems will be dynamically loaded by their mount programs
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if not already present in the kernel, using the
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.Xr vfsload 3
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subroutine. Because this mechanism requires writable temporary space,
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the filesystem type containing
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.Pa /tmp
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must be compiled into the kernel, and the filesystems containing
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.Pa /tmp
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and
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.Pa /usr/bin/ld
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must be listed in
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.Pa /etc/fstab
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before any filesystems which might be dynamically loaded.
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.It Fl u
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The
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.Fl u
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flag indicates that the status of an already mounted file
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system should be changed.
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Any of the options discussed above (the
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.Fl o
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option)
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may be changed;
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also a file system can be changed from read-only to read-write
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or vice versa.
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An attempt to change from read-write to read-only will fail if any
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files on the filesystem are currently open for writing unless the
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.Fl f
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flag is also specified.
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The set of options is determined by first extracting the options
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for the file system from the
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.Xr fstab 5
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table,
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then applying any options specified by the
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.Fl o
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argument,
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and finally applying the
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.Fl r
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or
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.Fl w
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option.
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.It Fl v
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Verbose mode.
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.It Fl w
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The file system object is to be read and write.
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.Pp
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The options specific to NFS filesystems are described in the
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.Xr mount_nfs 8
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manual page.
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.Sh DIAGNOSTICS
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Various, most of them are self-explanatory.
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.Pp
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.Dl XXXXX filesystem is not available
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.Pp
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The kernel doesn't support the respective filesystem type. Note that
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support for a particular filesystem might be provided either on a static
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(kernel compile-time), or dynamic basis (loaded as a kernel module by
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.Xr modload 8 ).
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Normally,
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.Nm
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or its subprocesses attempt to dynamically load a filesystem module if
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it hasn't been configured statically, using
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.Xr vfsload 3 .
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In this case, the above error message can also mean that you didn't
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have permission to load the module.
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.Sh FILES
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.Bl -tag -width /etc/fstab -compact
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.It Pa /etc/fstab
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file system table
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.El
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.Sh SEE ALSO
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.Xr mount 2 ,
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.Xr vfsload 3 ,
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.Xr fstab 5 ,
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.Xr mount_cd9660 8 ,
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.Xr mount_devfs 8 ,
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.Xr mount_fdesc 8 ,
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.Xr mount_kernfs 8 ,
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.Xr mount_lfs 8 ,
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.Xr mount_mfs 8 ,
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.Xr mount_msdos 8 ,
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.Xr mount_nfs 8 ,
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.Xr mount_null 8 ,
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.Xr mount_portal 8 ,
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.Xr mount_procfs 8 ,
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.Xr mount_umap 8 ,
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.Xr mount_union 8 ,
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.Xr umount 8
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.Sh BUGS
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It is possible for a corrupted file system to cause a crash.
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.Pp
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Switching a filesystem back and forth between asynchronous and normal
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operation or between read/write and read/only access using ``mount
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-u'' may gradually bring about severe filesystem corruption.
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.Sh CAVEATS
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After a successful mount, the permissions on the original mount point
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determine if
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.Pa ".."
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is accessible from the mounted file system. The minimum permissions for
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the mount point for traversal across the mount point in both
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directions to be possible for all users is 0111 (execute for all).
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v1 .
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