447 lines
14 KiB
Groff
447 lines
14 KiB
Groff
.\" 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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.\" @(#)mount.2 8.2 (Berkeley) 12/11/93
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.\"
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.Dd December 11, 1993
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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/param.h>
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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 filesystem 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 filesystem.
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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_NOATIME
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Disable update of file access times.
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.It Dv MNT_NODEV
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Do not interpret special files on the filesystem.
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.It Dv MNT_SYNCHRONOUS
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All I/O to the filesystem should be done synchronously.
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.It Dv MNT_ASYNC
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All I/O to the filesystem should be done asynchronously.
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.It Dv MNT_WANTRDWR
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Upgrade a mounted read-only filesystem to read-write if MNT_UPDATE
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is also specified.
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.It Dv MNT_FORCE
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Fore a read-write mount even if the filesystem appears to be unclean.
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Dangerous.
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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 filesystem.
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This allows the mount flags to be changed without requiring
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that the filesystem be unmounted and remounted.
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Some filesystems may not allow all flags to be changed.
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For example,
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many filesystems will not allow a change from read-write to read-only.
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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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the specified already mounted filesystem.
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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 filesystem.
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The types of filesystems 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 filesystems and
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their type specific data are:
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.Pp
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.Bd -literal -compact
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/*
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* Export arguments for local filesystem mount calls.
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*/
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struct export_args {
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int ex_flags; /* export related flags */
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uid_t ex_root; /* mapping for root uid */
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struct ucred ex_anon; /* mapping for anonymous user */
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struct sockaddr *ex_addr; /* net address to which exported */
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int ex_addrlen; /* and the net address length */
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struct sockaddr *ex_mask; /* mask of valid bits in saddr */
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int ex_masklen; /* and the smask length */
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};
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.Ed
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.Pp
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.Dv MOUNT_UFS
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.Pp
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.Bd -literal -compact
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/*
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* Arguments to mount UFS-bases filesystems
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*/
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struct ufs_args {
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char *fspec; /* Block special file to mount */
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struct export_args export; /* network export information */
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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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.Pp
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.Bd -literal -compact
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#ifdef NFS
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/*
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* Arguments to mount NFS
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*/
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#define NFS_ARGSVERSION 3 /* change when nfs_args changes */
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struct nfs_args {
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int version; /* args structure version number */
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struct sockaddr *addr; /* file server address */
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int addrlen; /* length of address */
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int sotype; /* Socket type */
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int proto; /* and Protocol */
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u_char *fh; /* File handle to be mounted */
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int fhsize; /* Size, in bytes, of fh */
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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 readdirsize; /* readdir size in bytes */
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int timeo; /* initial timeout in .1 secs */
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int retrans; /* times to retry send */
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int maxgrouplist; /* Max. size of group list */
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int readahead; /* # of blocks to readahead */
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int leaseterm; /* Term (sec) of lease */
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int deadthresh; /* Retrans threshold */
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char *hostname; /* server's name */
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};
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/*
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* NFS mount option flags
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*/
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#define NFSMNT_SOFT 0x00000001 /* soft mount (hard is default) */
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#define NFSMNT_WSIZE 0x00000002 /* set write size */
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#define NFSMNT_RSIZE 0x00000004 /* set read size */
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#define NFSMNT_TIMEO 0x00000008 /* set initial timeout */
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#define NFSMNT_RETRANS 0x00000010 /* set number of request retries */
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#define NFSMNT_MAXGRPS 0x00000020 /* set maximum grouplist size */
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#define NFSMNT_INT 0x00000040 /* allow interrupts on hard mount */
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#define NFSMNT_NOCONN 0x00000080 /* Don't Connect the socket */
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#define NFSMNT_NQNFS 0x00000100 /* Use Nqnfs protocol */
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#define NFSMNT_NFSV3 0x00000200 /* Use NFS Version 3 protocol */
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#define NFSMNT_KERB 0x00000400 /* Use Kerberos authentication */
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#define NFSMNT_DUMBTIMR 0x00000800 /* Don't estimate rtt dynamically */
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#define NFSMNT_LEASETERM 0x00001000 /* set lease term (nqnfs) */
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#define NFSMNT_READAHEAD 0x00002000 /* set read ahead */
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#define NFSMNT_DEADTHRESH 0x00004000 /* set dead server retry thresh */
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#define NFSMNT_RESVPORT 0x00008000 /* Allocate a reserved port */
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#define NFSMNT_RDIRPLUS 0x00010000 /* Use Readdirplus for V3 */
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#define NFSMNT_READDIRSIZE 0x00020000 /* Set readdir size */
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#define NFSMNT_INTERNAL 0xfffc0000 /* Bits set internally */
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#define NFSMNT_HASWRITEVERF 0x00040000 /* Has write verifier for V3 */
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#define NFSMNT_GOTPATHCONF 0x00080000 /* Got the V3 pathconf info */
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#define NFSMNT_GOTFSINFO 0x00100000 /* Got the V3 fsinfo */
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#define NFSMNT_MNTD 0x00200000 /* Mnt server for mnt point */
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#define NFSMNT_DISMINPROG 0x00400000 /* Dismount in progress */
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#define NFSMNT_DISMNT 0x00800000 /* Dismounted */
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#define NFSMNT_SNDLOCK 0x01000000 /* Send socket lock */
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#define NFSMNT_WANTSND 0x02000000 /* Want above */
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#define NFSMNT_RCVLOCK 0x04000000 /* Rcv socket lock */
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#define NFSMNT_WANTRCV 0x08000000 /* Want above */
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#define NFSMNT_WAITAUTH 0x10000000 /* Wait for authentication */
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#define NFSMNT_HASAUTH 0x20000000 /* Has authenticator */
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#define NFSMNT_WANTAUTH 0x40000000 /* Wants an authenticator */
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#define NFSMNT_AUTHERR 0x80000000 /* Authentication error */
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#endif /* NFS */
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.Ed
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.Pp
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.Dv MOUNT_MFS
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.Pp
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.Bd -literal -compact
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/*
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* Arguments to mount MFS
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*/
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struct mfs_args {
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char *fspec; /* name to export for statfs */
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struct export_args export; /* if exported MFSes are supported */
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caddr_t base; /* base of file system in memory */
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u_long size; /* size of file system */
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};
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.Ed
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.Pp
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.Dv MOUNT_MSDOSFS
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.Pp
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.Bd -literal -compact
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#ifdef MSDOSFS
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/*
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* Arguments to mount MSDOS filesystems.
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*/
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struct msdosfs_args {
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char *fspec; /* blocks special holding the fs to mount */
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struct export_args export; /* network export information */
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uid_t uid; /* uid that owns msdosfs files */
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gid_t gid; /* gid that owns msdosfs files */
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mode_t mask; /* mask to be applied for msdosfs perms */
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};
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#endif
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.Ed
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.Pp
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.Dv MOUNT_CD9660
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.Pp
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.Bd -literal -compact
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#ifdef CD9660
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/*
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* Arguments to mount ISO 9660 filesystems.
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*/
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struct iso_args {
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char *fspec; /* block special device to mount */
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struct export_args export; /* network export info */
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int flags; /* mounting flags, see below */
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};
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#define ISOFSMNT_NORRIP 0x00000001 /* disable Rock Ridge Ext.*/
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#define ISOFSMNT_GENS 0x00000002 /* enable generation numbers */
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#define ISOFSMNT_EXTATT 0x00000004 /* enable extended attributes */
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#endif /* CD9660 */
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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 specify
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.Dv MNT_FORCE
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to specify that the filesystem should be forcibly unmounted or made read-only
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(if MNT_UPDATE and MNT_RDONLY are also specified)
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even if files are 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 filesystem is later remounted.
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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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The
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.Fn umount
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function 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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The
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.Fn mount
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function will fail when one of the following occurs:
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.Bl -tag -width [ENOTBLK]
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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 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
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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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filesystem mount:
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.Bl -tag -width [ENOTBLK]
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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 filesystem 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 filesystem.
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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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filesystem mount:
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.Bl -tag -width [ENOTBLK]
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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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filesystem mount:
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.Bl -tag -width [ENOTBLK]
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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 filesystem 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 filesystem.
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.It Bq Er EIO
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A 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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The
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.Fn umount
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function may fail with one of the following errors:
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.Bl -tag -width [ENOTBLK]
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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 EINVAL
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The pathname contains a character with the high-order bit set.
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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 an entire 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 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 filesystem.
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.It Bq Er EIO
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An I/O error occurred while writing cached filesystem 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 mfs 8 ,
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.Xr mount 8 ,
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.Xr umount 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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