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high-order bit set", as this error is obsolete. Eventually we may want to add code to some of the "optional" filesystems (msdosfs, etc.) that checks for illegal characters. At that time it would be appropriate to reintroduce this error with appropriate text. Perhaps "The pathname contains a character that is not valid for filesystem type".
322 lines
9.0 KiB
Groff
322 lines
9.0 KiB
Groff
.\" Copyright (c) 1980, 1989 The Regents of the University of California.
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.\" 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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.\" from: @(#)mount.2 6.12 (Berkeley) 3/15/91
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.\" $Id: mount.2,v 1.7 1994/04/22 00:13:42 jtc Exp $
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.\"
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.Dd March 15, 1991
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.Dt MOUNT 2
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.Os BSD 4
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.Sh NAME
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.Nm mount ,
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.Nm unmount
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.Nd mount or dismount a filesystem
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.Sh SYNOPSIS
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.Fd #include <sys/mount.h>
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.Ft int
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.Fn mount "int type" "const char *dir" "int flags" "caddr_t data"
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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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function grafts
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a filesystem object onto the system file tree
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at the point
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.Ar dir .
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The argument
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.Ar data
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describes the filesystem object to be mounted.
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The argument
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.Ar type
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tells the kernel how to interpret
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.Ar data
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(See
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.Ar type
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below).
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The contents of the filesystem
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become available through the new mount point
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.Ar dir .
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Any files in
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.Ar dir
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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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are unavailable until the filesystem is unmounted.
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.Pp
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The following
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.Ar flags
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may be specified to
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suppress default semantics which affect filesystem access.
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.Bl -tag -width MNT_SYNCHRONOUS
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.It Dv MNT_RDONLY
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The file system should be treated as read-only;
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Even the super-user may not write on it.
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.It Dv MNT_NOEXEC
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Do not allow files to be executed from the file system.
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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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.It Dv MNT_NODEV
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Do not interpret special files on the file system.
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.It Dv MNT_SYNCHRONOUS
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All I/O to the file system should be done synchronously.
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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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indicates that the mount command is being applied
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to an already mounted file system.
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This allows the mount flags to be changed without requiring
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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.
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For example,
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most file systems will not allow a change from read-write to read-only.
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.Pp
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The
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.Fa type
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argument defines the type of the file system.
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The types of file systems known to the system are defined in
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.Aq Pa sys/mount.h .
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.Fa Data
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is a pointer to a structure that contains the type
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specific arguments to mount.
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The currently supported types of file systems and
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their type specific data are:
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.Pp
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.Dv MOUNT_UFS
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.Bd -literal -offset indent -compact
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struct ufs_args {
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char *fspec; /* Block special file to mount */
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int exflags; /* export related flags */
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uid_t exroot; /* mapping for root uid */
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};
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.Ed
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.Pp
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.Dv MOUNT_NFS
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.Bd -literal -offset indent -compact
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struct nfs_args {
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struct sockaddr_in *addr; /* file server address */
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nfsv2fh_t *fh; /* File handle to be mounted */
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int flags; /* flags */
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int wsize; /* write size in bytes */
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int rsize; /* read size in bytes */
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int timeo; /* initial timeout 0.1 secs */
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int retrans; /* times to retry send */
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char *hostname; /* server's name */
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};
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.Ed
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.Pp
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.Dv MOUNT_MFS
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.Bd -literal -offset indent -compact
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struct mfs_args {
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char *name; /* name of backing process */
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caddr_t base; /* base address of the file system */
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u_long size; /* size of the file system */
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};
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.Ed
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.Pp
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The
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.Fn umount
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function call disassociates the filesystem from the specified
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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
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argument may have one of the following values:
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.Bl -tag -width MNT_SYNCHRONOUS
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.It Dv MNT_NOFORCE
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The unmount should fail if any files are active on the file system.
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.It Dv MNT_FORCE
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The file system should be forcibly unmounted even if files are
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still active.
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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
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even if the file system is later remounted.
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.El
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.Sh RETURN VALUES
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The
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.Fn mount
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returns the value 0 if the mount was successful, otherwise -1 is returned
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and the variable
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.Va errno
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is set to indicate the error.
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.Pp
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.Nm Umount
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returns the value 0 if the umount succeeded; otherwise -1 is returned
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and the variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn Mount
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will fail when one of the following occurs:
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.Bl -tag -width Er
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.It Bq Er EPERM
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The caller is not the super-user.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded
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.Dv {NAME_MAX}
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characters, or an entire path name exceeded
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.Dv {PATH_MAX}
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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
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.Ar name
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is not a directory,
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or a path prefix of
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.Ar special
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is not a directory.
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.It Bq Er EBUSY
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Another process currently holds a reference to
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.Fa dir .
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.It Bq Er EFAULT
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.Fa Dir
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points outside the process's allocated address space.
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.El
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.Pp
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The following errors can occur for a
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.Em ufs
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file system mount:
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.Bl -tag -width Er
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.It Bq Er ENODEV
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A component of ufs_args
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.Ar fspec
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does not exist.
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.It Bq Er ENOTBLK
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.Ar Fspec
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is not a block device.
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.It Bq Er ENXIO
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The major device number of
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.Ar fspec
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is out of range (this indicates no device driver exists
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for the associated hardware).
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.It Bq Er EBUSY
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.Ar Fspec
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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
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The super block for the file system had a bad magic
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number or an out of range block size.
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.It Bq Er ENOMEM
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Not enough memory was available to read the cylinder
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group information for the file system.
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.It Bq Er EIO
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An I/O error occurred while reading the super block or
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cylinder group information.
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.It Bq Er EFAULT
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.Ar Fspec
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points outside the process's allocated address space.
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.El
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.Pp
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The following errors can occur for a
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.Em nfs
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file system mount:
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.Bl -tag -width Er
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.It Bq Er ETIMEDOUT
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.Em Nfs
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timed out trying to contact the server.
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.It Bq Er EFAULT
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Some part of the information described by nfs_args
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points outside the process's allocated address space.
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.El
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.Pp
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The following errors can occur for a
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.Em mfs
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file system mount:
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.Bl -tag -width Er
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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
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The super block for the file system had a bad magic
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number or an out of range block size.
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.It Bq Er ENOMEM
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Not enough memory was available to read the cylinder
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group information for the file system.
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.It Bq Er EIO
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An paging error occurred while reading the super block or
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cylinder group information.
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.It Bq Er EFAULT
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.Em Name
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points outside the process's allocated address space.
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.El
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.Pp
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.Nm Umount
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may fail with one of the following errors:
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.Bl -tag -width Er
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.It Bq Er EPERM
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The caller is not the super-user.
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.It Bq Er ENOTDIR
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A component of the path is not a directory.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded
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.Dv {NAME_MAX}
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characters, or an entire path name exceeded
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.Dv {PATH_MAX}
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characters.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EINVAL
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The requested directory is not in the mount table.
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.It Bq Er EBUSY
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A process is holding a reference to a file located
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on the file system.
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.It Bq Er EIO
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An I/O error occurred while writing cached file system information.
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.It Bq Er EFAULT
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.Fa Dir
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points outside the process's allocated address space.
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.El
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.Pp
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A
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.Em ufs
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or
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.Em mfs
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mount can also fail if the maximum number of filesystems are currently
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mounted.
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.Sh SEE ALSO
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.Xr mount 8 ,
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.Xr umount 8 ,
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.Xr mfs 8
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.Sh BUGS
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Some of the error codes need translation to more obvious messages.
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.Sh HISTORY
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.Fn Mount
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and
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.Fn umount
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function calls appeared in
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.At v6 .
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