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-.\"	California, Berkeley and its contributors.
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-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
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-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-.\"
-.\"     @(#)mount.2	8.3 (Berkeley) 5/24/95
-.\"
-.Dd May 24, 1995
-.Dt MOUNT 2
-.Os BSD 4
-.Sh NAME
-.Nm mount ,
-.Nm unmount
-.Nd mount or dismount a filesystem
-.Sh SYNOPSIS
-.Fd #include <sys/param.h>
-.Fd #include <sys/mount.h>
-.Ft int
-.Fn mount "const char *type" "const char *dir" "int flags" "void *data"
-.Ft int
-.Fn unmount "const char *dir" "int flags"
-.Sh DESCRIPTION
-The
-.Fn mount
-function grafts
-a filesystem object onto the system file tree
-at the point
-.Ar dir .
-The argument
-.Ar data
-describes the filesystem object to be mounted.
-The argument
-.Ar type
-tells the kernel how to interpret
-.Ar data
-(See
-.Ar type
-below).
-The contents of the filesystem
-become available through the new mount point
-.Ar dir .
-Any files in
-.Ar dir
-at the time
-of a successful mount are swept under the carpet so to speak, and
-are unavailable until the filesystem is unmounted.
-.Pp
-The following
-.Ar flags
-may be specified to
-suppress default semantics which affect filesystem access.
-.Bl -tag -width MNT_SYNCHRONOUS
-.It Dv MNT_RDONLY
-The filesystem should be treated as read-only;
-Even the super-user may not write on it.
-Specifying MNT_UPDATE withut this option will upgrade 
-a read-only filesystem to read/write.
-.It Dv MNT_NOEXEC
-Do not allow files to be executed from the filesystem.
-.It Dv MNT_NOSUID
-Do not honor setuid or setgid bits on files when executing them.
-.It Dv MNT_NOATIME
-Disable update of file access times.
-.It Dv MNT_NODEV
-Do not interpret special files on the filesystem.
-.It Dv MNT_SUIDDIR
-Directories with the SUID bit set chown new files to their own owner.
-.It Dv MNT_SYNCHRONOUS
-All I/O to the filesystem should be done synchronously.
-.It Dv MNT_ASYNC
-All I/O to the filesystem should be done asynchronously.
-.It Dv MNT_FORCE
-Fore a read-write mount even if the filesystem appears to be unclean.
-Dangerous.
-.It Dv MNT_NOCLUSTERR
-Disable read clustering.
-.It Dv MNT_NOCLUSTERW
-Disable write clustering.
-.El
-.Pp
-The flag
-.Dv MNT_UPDATE
-indicates that the mount command is being applied 
-to an already mounted filesystem.
-This allows the mount flags to be changed without requiring
-that the filesystem be unmounted and remounted.
-Some filesystems may not allow all flags to be changed.
-For example,
-many filesystems will not allow a change from read-write to read-only.
-.Pp
-The flag
-.Dv MNT_RELOAD
-causes the vfs subsystem to update its data structures pertaining to
-the specified already mounted filesystem.
-.Pp
-The
-.Fa type
-argument names the filesystem.
-The types of filesystems known to the system can be obtained with
-.Xr lsvfs 1 .
-.Pp
-.Fa Data
-is a pointer to a structure that contains the type
-specific arguments to mount.
-The format for these argument structures is described in the
-manual page for each filesystem.
-By convention filesystem manual pages are named
-by prefixing ``mount_'' to the name of the filesystem as returned by
-.Xr lsvfs 1 .
-Thus the
-.Nm NFS
-filesystem is described by the
-.Xr mount_nfs 8
-manual page.
-.Pp
-The
-.Fn umount
-function call disassociates the filesystem from the specified
-mount point
-.Fa dir .
-.Pp
-The
-.Fa flags
-argument may specify
-.Dv MNT_FORCE
-to specify that the filesystem should be forcibly unmounted or made read-only
-(if MNT_UPDATE and MNT_RDONLY are also specified)
-even if files are still active.
-Active special devices continue to work,
-but any further accesses to any other active files result in errors
-even if the filesystem is later remounted.
-.Pp
-The
-.Dv MNT_SUIDDIR
-option requires the SUIDDIR option to have been compiled into the kernel
-to have any effect.
-See the
-.Xr mount 8 
-and
-.Xr chmod 2
-pages for more information.
-.Sh RETURN VALUES
-The
-.Fn mount
-returns the value 0 if the mount was successful, otherwise -1 is returned
-and the variable
-.Va errno
-is set to indicate the error.
-.Pp
-The
-.Fn umount
-function returns the value 0 if the umount succeeded; otherwise -1 is returned
-and the variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-The
-.Fn mount
-function will fail when one of the following occurs:
-.Bl -tag -width [ENOTBLK]
-.It Bq Er EPERM
-The caller is not the super-user.
-.It Bq Er ENAMETOOLONG
-A component of a pathname exceeded 255 characters,
-or the entire length of a path name exceeded 1023 characters.
-.It Bq Er ELOOP
-Too many symbolic links were encountered in translating a pathname.
-.It Bq Er ENOENT
-A component of
-.Fa dir
-does not exist.
-.It Bq Er ENOTDIR
-A component of
-.Ar name
-is not a directory,
-or a path prefix of
-.Ar special
-is not a directory.
-.It Bq Er EBUSY
-Another process currently holds a reference to
-.Fa dir .
-.It Bq Er EFAULT
-.Fa Dir
-points outside the process's allocated address space.
-.El
-.Pp
-The following errors can occur for a
-.Em ufs
-filesystem mount:
-.Bl -tag -width [ENOTBLK]
-.It Bq Er ENODEV
-A component of ufs_args
-.Ar fspec
-does not exist.
-.It Bq Er ENOTBLK
-.Ar Fspec
-is not a block device.
-.It Bq Er ENXIO
-The major device number of 
-.Ar fspec
-is out of range (this indicates no device driver exists
-for the associated hardware).
-.It Bq Er EBUSY
-.Ar Fspec
-is already mounted.
-.It Bq Er EMFILE
-No space remains in the mount table.
-.It Bq Er EINVAL
-The super block for the filesystem had a bad magic
-number or an out of range block size.
-.It Bq Er ENOMEM
-Not enough memory was available to read the cylinder
-group information for the filesystem.
-.It Bq Er EIO
-An I/O error occurred while reading the super block or
-cylinder group information.
-.It Bq Er EFAULT
-.Ar Fspec
-points outside the process's allocated address space.
-.El
-.Pp
-The following errors can occur for a
-.Em nfs
-filesystem mount:
-.Bl -tag -width [ENOTBLK]
-.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
-The following errors can occur for a
-.Em mfs
-filesystem mount:
-.Bl -tag -width [ENOTBLK]
-.It Bq Er EMFILE
-No space remains in the mount table.
-.It Bq Er EINVAL
-The super block for the filesystem had a bad magic
-number or an out of range block size.
-.It Bq Er ENOMEM
-Not enough memory was available to read the cylinder
-group information for the filesystem.
-.It Bq Er EIO
-A paging error occurred while reading the super block or
-cylinder group information.
-.It Bq Er EFAULT
-.Em Name
-points outside the process's allocated address space.
-.El
-.Pp
-The
-.Fn umount
-function may fail with one of the following errors:
-.Bl -tag -width [ENOTBLK]
-.It Bq Er EPERM
-The caller is not the super-user.
-.It Bq Er ENOTDIR
-A component of the path is not a directory.
-.It Bq Er EINVAL
-The pathname contains a character with the high-order bit set.
-.It Bq Er ENAMETOOLONG
-A component of a pathname exceeded 255 characters,
-or an entire path name exceeded 1023 characters.
-.It Bq Er ELOOP
-Too many symbolic links were encountered in translating the pathname.
-.It Bq Er EINVAL
-The requested directory is not in the mount table.
-.It Bq Er EBUSY
-A process is holding a reference to a file located
-on the filesystem.
-.It Bq Er EIO
-An I/O error occurred while writing cached filesystem information.
-.It Bq Er EFAULT
-.Fa Dir
-points outside the process's allocated address space.
-.El
-.Pp
-A
-.Em ufs
-or
-.Em mfs
-mount can also fail if the maximum number of filesystems are currently
-mounted.
-.Sh SEE ALSO
-.Xr lsvfs 1 ,
-.Xr mfs 8 ,
-.Xr mount 8 ,
-.Xr umount 8
-.Sh BUGS
-Some of the error codes need translation to more obvious messages.
-.Sh HISTORY
-.Fn Mount
-and
-.Fn umount
-function calls appeared in
-.At v6 .