1994-05-27 05:00:24 +00:00
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.\" Copyright (c) 1980, 1989, 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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1997-03-11 11:35:56 +00:00
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.\" @(#)mount.2 8.3 (Berkeley) 5/24/95
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1994-05-27 05:00:24 +00:00
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.\"
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2003-09-08 16:23:21 +00:00
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.Dd September 8, 2003
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1994-05-27 05:00:24 +00:00
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.Dt MOUNT 2
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2001-07-10 13:41:46 +00:00
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.Os
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1994-05-27 05:00:24 +00:00
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.Sh NAME
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.Nm mount ,
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.Nm unmount
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2002-12-12 17:26:04 +00:00
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.Nd mount or dismount a file system
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2000-04-21 09:42:15 +00:00
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.Sh LIBRARY
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.Lb libc
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1994-05-27 05:00:24 +00:00
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.Sh SYNOPSIS
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2001-10-01 16:09:29 +00:00
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.In sys/param.h
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.In sys/mount.h
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1994-05-27 05:00:24 +00:00
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.Ft int
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1997-11-05 10:09:33 +00:00
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.Fn mount "const char *type" "const char *dir" "int flags" "void *data"
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1994-05-27 05:00:24 +00:00
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.Ft int
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.Fn unmount "const char *dir" "int flags"
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.Sh DESCRIPTION
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The
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.Fn mount
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2002-12-18 09:22:32 +00:00
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system call grafts
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2002-12-12 17:26:04 +00:00
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a file system object onto the system file tree
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1994-05-27 05:00:24 +00:00
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at the point
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2002-12-18 13:33:04 +00:00
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.Fa dir .
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1994-05-27 05:00:24 +00:00
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The argument
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2002-12-18 13:33:04 +00:00
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.Fa data
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2002-12-12 17:26:04 +00:00
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describes the file system object to be mounted.
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1994-05-27 05:00:24 +00:00
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The argument
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2002-12-18 13:33:04 +00:00
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.Fa type
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1994-05-27 05:00:24 +00:00
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tells the kernel how to interpret
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2002-12-18 13:33:04 +00:00
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.Fa data
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1994-05-27 05:00:24 +00:00
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(See
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2002-12-18 13:33:04 +00:00
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.Fa type
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1994-05-27 05:00:24 +00:00
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below).
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2002-12-12 17:26:04 +00:00
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The contents of the file system
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1994-05-27 05:00:24 +00:00
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become available through the new mount point
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2002-12-18 13:33:04 +00:00
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.Fa dir .
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1994-05-27 05:00:24 +00:00
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Any files in
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2002-12-18 13:33:04 +00:00
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.Fa dir
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1994-05-27 05:00:24 +00:00
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at the time
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of a successful mount are swept under the carpet so to speak, and
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2002-12-12 17:26:04 +00:00
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are unavailable until the file system is unmounted.
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1994-05-27 05:00:24 +00:00
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.Pp
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2003-01-13 19:42:21 +00:00
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By default only the super-user may call the
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.Fn mount
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2003-02-23 01:47:49 +00:00
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system call.
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This restriction can be removed by setting the
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.Va vfs.usermount
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.Xr sysctl 8
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variable
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2003-01-13 19:42:21 +00:00
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to a non-zero value.
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.Pp
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1994-05-27 05:00:24 +00:00
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The following
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2002-12-18 13:33:04 +00:00
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.Fa flags
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1994-05-27 05:00:24 +00:00
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may be specified to
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2002-12-12 17:26:04 +00:00
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suppress default semantics which affect file system access.
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1994-05-27 05:00:24 +00:00
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.Bl -tag -width MNT_SYNCHRONOUS
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.It Dv MNT_RDONLY
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2002-12-12 17:26:04 +00:00
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The file system should be treated as read-only;
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2003-01-13 19:42:21 +00:00
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even the super-user may not write on it.
|
2001-07-15 07:53:42 +00:00
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Specifying MNT_UPDATE without this option will upgrade
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2002-12-12 17:26:04 +00:00
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a read-only file system to read/write.
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1994-05-27 05:00:24 +00:00
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.It Dv MNT_NOEXEC
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2002-12-12 17:26:04 +00:00
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Do not allow files to be executed from the file system.
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1994-05-27 05:00:24 +00:00
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.It Dv MNT_NOSUID
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Do not honor setuid or setgid bits on files when executing them.
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2003-01-13 19:42:21 +00:00
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This flag is set automatically when the caller is not the super-user.
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1996-11-10 05:56:43 +00:00
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.It Dv MNT_NOATIME
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Disable update of file access times.
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1994-05-27 05:00:24 +00:00
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.It Dv MNT_NODEV
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2002-12-12 17:26:04 +00:00
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Do not interpret special files on the file system.
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2003-01-13 19:42:21 +00:00
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This flag is set automatically when the caller is not the super-user.
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1997-11-13 00:28:51 +00:00
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.It Dv MNT_SUIDDIR
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Directories with the SUID bit set chown new files to their own owner.
|
2003-06-30 22:22:12 +00:00
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This flag requires the SUIDDIR option to have been compiled into the kernel
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to have any effect.
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See the
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.Xr mount 8
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and
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.Xr chmod 2
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pages for more information.
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1994-05-27 05:00:24 +00:00
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.It Dv MNT_SYNCHRONOUS
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2002-12-12 17:26:04 +00:00
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All I/O to the file system should be done synchronously.
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1996-11-10 05:56:43 +00:00
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.It Dv MNT_ASYNC
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2002-12-12 17:26:04 +00:00
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All I/O to the file system should be done asynchronously.
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1996-11-10 09:28:20 +00:00
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.It Dv MNT_FORCE
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2002-12-12 17:26:04 +00:00
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Force a read-write mount even if the file system appears to be unclean.
|
1996-11-10 09:28:20 +00:00
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Dangerous.
|
2003-06-30 22:22:12 +00:00
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Together with
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.Dv MNT_UPDATE
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and
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.Dv MNT_RDONLY ,
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specify that the file system is to be forcibly downgraded to a read-only
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mount even if some files are open for writing.
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1997-11-09 03:36:26 +00:00
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.It Dv MNT_NOCLUSTERR
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Disable read clustering.
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.It Dv MNT_NOCLUSTERW
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Disable write clustering.
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1994-05-27 05:00:24 +00:00
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.El
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.Pp
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The flag
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.Dv MNT_UPDATE
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2001-07-15 07:53:42 +00:00
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indicates that the mount command is being applied
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2002-12-12 17:26:04 +00:00
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to an already mounted file system.
|
1994-05-27 05:00:24 +00:00
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This allows the mount flags to be changed without requiring
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2002-12-12 17:26:04 +00:00
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that the file system be unmounted and remounted.
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Some file systems may not allow all flags to be changed.
|
1994-05-27 05:00:24 +00:00
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For example,
|
2002-12-12 17:26:04 +00:00
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|
many file systems will not allow a change from read-write to read-only.
|
1996-11-10 05:56:43 +00:00
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.Pp
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The flag
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.Dv MNT_RELOAD
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causes the vfs subsystem to update its data structures pertaining to
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2002-12-12 17:26:04 +00:00
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the specified already mounted file system.
|
1994-05-27 05:00:24 +00:00
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.Pp
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The
|
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.Fa type
|
2002-12-12 17:26:04 +00:00
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argument names the file system.
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The types of file systems known to the system can be obtained with
|
1997-11-05 10:09:33 +00:00
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.Xr lsvfs 1 .
|
1997-03-11 11:35:56 +00:00
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.Pp
|
2002-12-19 09:40:28 +00:00
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The
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.Fa data
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argument
|
1994-05-27 05:00:24 +00:00
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is a pointer to a structure that contains the type
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specific arguments to mount.
|
1997-03-11 11:35:56 +00:00
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The format for these argument structures is described in the
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2002-12-12 17:26:04 +00:00
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manual page for each file system.
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By convention file system manual pages are named
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by prefixing ``mount_'' to the name of the file system as returned by
|
1997-11-05 10:09:33 +00:00
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.Xr lsvfs 1 .
|
1997-03-11 11:35:56 +00:00
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Thus the
|
2002-12-18 09:22:32 +00:00
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.Tn NFS
|
2002-12-12 17:26:04 +00:00
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file system is described by the
|
1997-03-11 11:35:56 +00:00
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.Xr mount_nfs 8
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manual page.
|
1996-11-10 05:56:43 +00:00
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.Pp
|
1994-05-27 05:00:24 +00:00
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The
|
1999-03-05 15:16:31 +00:00
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.Fn unmount
|
2002-12-18 09:22:32 +00:00
|
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system call disassociates the file system from the specified
|
1994-05-27 05:00:24 +00:00
|
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mount point
|
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.Fa dir .
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.Pp
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The
|
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.Fa flags
|
2003-06-30 22:22:12 +00:00
|
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|
argument may include
|
1994-05-27 05:00:24 +00:00
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.Dv MNT_FORCE
|
2003-06-30 22:22:12 +00:00
|
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|
to specify that the file system should be forcibly unmounted
|
1996-11-10 05:56:43 +00:00
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|
even if files are still active.
|
1994-05-27 05:00:24 +00:00
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Active special devices continue to work,
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|
but any further accesses to any other active files result in errors
|
2002-12-12 17:26:04 +00:00
|
|
|
even if the file system is later remounted.
|
2003-07-01 17:40:23 +00:00
|
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|
.Pp
|
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If the
|
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.Dv MNT_BYFSID
|
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|
flag is specified,
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.Fa dir
|
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|
should instead be a file system ID encoded as
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.Dq Li FSID : Ns Ar val0 : Ns Ar val1 ,
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where
|
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.Ar val0
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|
and
|
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.Ar val1
|
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|
are the contents of the
|
|
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.Vt fsid_t
|
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.Va val[]
|
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array in decimal.
|
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|
The file system that has the specified file system ID will be unmounted.
|
1994-05-27 05:00:24 +00:00
|
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.Sh RETURN VALUES
|
2001-08-31 09:57:38 +00:00
|
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.Rv -std
|
1994-05-27 05:00:24 +00:00
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.Sh ERRORS
|
1996-08-22 23:31:07 +00:00
|
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|
The
|
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|
.Fn mount
|
2002-12-18 09:22:32 +00:00
|
|
|
system call will fail when one of the following occurs:
|
2000-05-04 13:09:25 +00:00
|
|
|
.Bl -tag -width Er
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er EPERM
|
2003-01-13 19:42:21 +00:00
|
|
|
The caller is neither the super-user nor the owner of
|
2003-02-23 01:47:49 +00:00
|
|
|
.Fa dir .
|
1994-05-27 05:00:24 +00:00
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.It Bq Er ENAMETOOLONG
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|
A component of a pathname exceeded 255 characters,
|
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or the entire length of a path name exceeded 1023 characters.
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.It Bq Er ELOOP
|
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Too many symbolic links were encountered in translating a pathname.
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.It Bq Er ENOENT
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|
A component of
|
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.Fa dir
|
|
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does not exist.
|
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.It Bq Er ENOTDIR
|
|
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|
A component of
|
2002-12-18 13:33:04 +00:00
|
|
|
.Fa name
|
1994-05-27 05:00:24 +00:00
|
|
|
is not a directory,
|
|
|
|
or a path prefix of
|
2002-12-18 13:33:04 +00:00
|
|
|
.Fa special
|
1994-05-27 05:00:24 +00:00
|
|
|
is not a directory.
|
|
|
|
.It Bq Er EBUSY
|
|
|
|
Another process currently holds a reference to
|
|
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|
.Fa dir .
|
|
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|
.It Bq Er EFAULT
|
2002-12-19 09:40:28 +00:00
|
|
|
The
|
|
|
|
.Fa dir
|
|
|
|
argument
|
1994-05-27 05:00:24 +00:00
|
|
|
points outside the process's allocated address space.
|
|
|
|
.El
|
|
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|
.Pp
|
|
|
|
The following errors can occur for a
|
|
|
|
.Em ufs
|
2002-12-12 17:26:04 +00:00
|
|
|
file system mount:
|
2000-11-22 16:02:00 +00:00
|
|
|
.Bl -tag -width Er
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er ENODEV
|
|
|
|
A component of ufs_args
|
2002-12-18 13:33:04 +00:00
|
|
|
.Fa fspec
|
1994-05-27 05:00:24 +00:00
|
|
|
does not exist.
|
|
|
|
.It Bq Er ENOTBLK
|
2002-12-19 09:40:28 +00:00
|
|
|
The
|
2002-12-18 13:33:04 +00:00
|
|
|
.Fa fspec
|
2002-12-19 09:40:28 +00:00
|
|
|
argument
|
1994-05-27 05:00:24 +00:00
|
|
|
is not a block device.
|
|
|
|
.It Bq Er ENXIO
|
2001-07-15 07:53:42 +00:00
|
|
|
The major device number of
|
2002-12-18 13:33:04 +00:00
|
|
|
.Fa fspec
|
1994-05-27 05:00:24 +00:00
|
|
|
is out of range (this indicates no device driver exists
|
|
|
|
for the associated hardware).
|
|
|
|
.It Bq Er EBUSY
|
2002-12-18 13:33:04 +00:00
|
|
|
.Fa fspec
|
1994-05-27 05:00:24 +00:00
|
|
|
is already mounted.
|
|
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|
.It Bq Er EMFILE
|
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|
No space remains in the mount table.
|
|
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|
.It Bq Er EINVAL
|
2002-12-12 17:26:04 +00:00
|
|
|
The super block for the file system had a bad magic
|
1994-05-27 05:00:24 +00:00
|
|
|
number or an out of range block size.
|
|
|
|
.It Bq Er ENOMEM
|
|
|
|
Not enough memory was available to read the cylinder
|
2002-12-12 17:26:04 +00:00
|
|
|
group information for the file system.
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er EIO
|
|
|
|
An I/O error occurred while reading the super block or
|
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|
|
cylinder group information.
|
|
|
|
.It Bq Er EFAULT
|
2002-12-19 09:40:28 +00:00
|
|
|
The
|
2002-12-18 13:33:04 +00:00
|
|
|
.Fa fspec
|
2002-12-19 09:40:28 +00:00
|
|
|
argument
|
1994-05-27 05:00:24 +00:00
|
|
|
points outside the process's allocated address space.
|
|
|
|
.El
|
|
|
|
.Pp
|
|
|
|
The following errors can occur for a
|
|
|
|
.Em nfs
|
2002-12-12 17:26:04 +00:00
|
|
|
file system mount:
|
2000-11-22 16:02:00 +00:00
|
|
|
.Bl -tag -width Er
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er ETIMEDOUT
|
|
|
|
.Em Nfs
|
|
|
|
timed out trying to contact the server.
|
|
|
|
.It Bq Er EFAULT
|
|
|
|
Some part of the information described by nfs_args
|
|
|
|
points outside the process's allocated address space.
|
|
|
|
.El
|
|
|
|
.Pp
|
1996-08-22 23:31:07 +00:00
|
|
|
The
|
1999-03-05 15:16:31 +00:00
|
|
|
.Fn unmount
|
2002-12-18 09:22:32 +00:00
|
|
|
system call may fail with one of the following errors:
|
2000-11-22 16:02:00 +00:00
|
|
|
.Bl -tag -width Er
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er EPERM
|
2003-01-13 19:42:21 +00:00
|
|
|
The caller is neither the super-user nor the user who issued the corresponding
|
2003-02-23 01:47:49 +00:00
|
|
|
.Fn mount
|
2003-01-13 19:42:21 +00:00
|
|
|
call.
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er ENAMETOOLONG
|
2003-09-08 16:23:21 +00:00
|
|
|
The length of the path name exceeded 1023 characters.
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er EINVAL
|
|
|
|
The requested directory is not in the mount table.
|
2003-09-08 16:23:21 +00:00
|
|
|
.It Bq Er ENOENT
|
|
|
|
The file system ID specified using
|
|
|
|
.Dv MNT_BYFSID
|
|
|
|
was not found in the mount table.
|
|
|
|
.It Bq Er EINVAL
|
|
|
|
The file system ID specified using
|
|
|
|
.Dv MNT_BYFSID
|
|
|
|
could not be decoded.
|
|
|
|
.It Bq Er EINVAL
|
|
|
|
The specified file system is the root file system.
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er EBUSY
|
|
|
|
A process is holding a reference to a file located
|
2002-12-12 17:26:04 +00:00
|
|
|
on the file system.
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er EIO
|
2002-12-12 17:26:04 +00:00
|
|
|
An I/O error occurred while writing cached file system information.
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er EFAULT
|
2002-12-19 09:40:28 +00:00
|
|
|
The
|
|
|
|
.Fa dir
|
|
|
|
argument
|
1994-05-27 05:00:24 +00:00
|
|
|
points outside the process's allocated address space.
|
|
|
|
.El
|
|
|
|
.Pp
|
|
|
|
A
|
|
|
|
.Em ufs
|
2002-12-12 17:26:04 +00:00
|
|
|
mount can also fail if the maximum number of file systems are currently
|
1994-05-27 05:00:24 +00:00
|
|
|
mounted.
|
|
|
|
.Sh SEE ALSO
|
1997-11-05 10:09:33 +00:00
|
|
|
.Xr lsvfs 1 ,
|
1994-05-27 05:00:24 +00:00
|
|
|
.Xr mount 8 ,
|
1997-01-20 23:23:22 +00:00
|
|
|
.Xr umount 8
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh BUGS
|
|
|
|
Some of the error codes need translation to more obvious messages.
|
|
|
|
.Sh HISTORY
|
2002-12-18 09:22:32 +00:00
|
|
|
The
|
|
|
|
.Fn mount
|
1994-05-27 05:00:24 +00:00
|
|
|
and
|
1999-03-05 15:16:31 +00:00
|
|
|
.Fn unmount
|
2002-12-18 09:22:32 +00:00
|
|
|
functions appeared in
|
1996-08-22 23:31:07 +00:00
|
|
|
.At v6 .
|