MOUNT(1M) RISC/os Reference Manual MOUNT(1M)
NAME
mount, umount - mount and dismount filesystems
SYNOPSIS
/etc/mount [-racvpfto [type|option]] ... [fsname] [dir]
/etc/umount -a[v] [-t type] [ -h host]
/etc/umount [-kv] path | dev
DESCRIPTION
mount announces to the system that a filesystem fsname is to
be attached to the file tree at the directory dir. The
directory dir must already exist. It becomes the name of
the newly mounted root. The contents of dir are hidden
until the filesystem is unmounted. If fsname is of the form
host:path the filesystem type is assumed to be nfs(7P).
umount announces to the system that the filesystem fsname
previously mounted on directory dir should be removed.
Either the filesystem name or the mounted-on directory may
be used.
mount and umount maintain a table of mounted filesystems in
/etc/mtab, described in mtab(4). If invoked without an
argument, mount displays the table. If invoked with only
one of fsname or dir mount searches the file /etc/fstab (see
fstab(4)) for an entry whose dir or fsname field matches the
given argument. For example, if this line is in /etc/fstab:
"/dev/xy0g /usr ffs rw 1 1"
then the commands mount /usr and mount /dev/xy0g are short-
hand for mount /dev/xy0g /usr.
MOUNT OPTIONS
-r Mount the specified filesystem read-only. This is a
shorthand for:
mount -o ro fsname dir
Physically write-protected and magnetic tape filesys-
tems must be mounted read-only, or errors occur when
access times are updated, whether or not any explicit
write is attempted.
-a Attempt to mount all the filesystems described in
/etc/fstab. (In this case, fsname and dir are taken
from /etc/fstab.) If a type is specified all of the
filesystems in /etc/fstab with that type are mounted.
filesystems are not necessarily mounted in the order
listed in /etc/fstab.
-c Invoke fsstat(1M) on each filesystem being mounted; and
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if it indicates that the filesystem is dirty, call
fsck(1M) to clean the filesystem. fsck is passed the
-p option.
-v Verbose - mount displays a message indicating the
filesystem being mounted.
-p Print the list of mounted filesystems in a format suit-
able for use in /etc/fstab.
-f Fake a new /etc/mtab entry, but do not actually mount
any filesystems.
-ttype
The type is the filesystem type. The accepted types
are ffs, ufs, 4.3, local and nfs; see fstab(4) for a
description of these filesystem types. The local type
is known only to mount and will cause all non-networked
filesystems to be mounted.
-o Specify options, a list of comma-separated words from
the list below. Some options are valid for all
filesystem types, while others apply to a specific type
only.
options valid on all filesystems. See fstab (4) for the
complete set of options (the defaults are rw, suid):
rw read/write.
ro read-only.
nosuid set-uid execution not allowed. The suid option
is not needed as suid is the default.
raw=path
the filesystem's raw device interface pathname.
hide | noauto
ignore this entry during a mount -a command to
allow you to define fstab entries for commonly
used filesystems you don't want to automatically
mount.
options specific to nfs (NFS) filesystems. See fstab (4)
for the complete set of options (the defaults are: fg,
retry=0, timeo=7, retrans=4,port=NFSPORT, hard with
defaults for rsize and wsize set by the kernel):
bg if the first mount attempt fails, retry in the
background.
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fg retry in foreground.
retry=nset number of mount failure retries to n.
rsize=nset read buffer size to n bytes.
wsize=nset write buffer size to n bytes.
timeo=nset NFS timeout to n tenths of a second.
retrans=n
set number of NFS retransmissions to n.
port=n set server IP port number to n.
soft return error if server doesn't respond.
hard retry request until server responds.
The bg option causes mount to run in the background if the
server's mountd(1M) does not respond. If bg is specified and
retry is not specified, retry defaults to 10000. mount
attempts each request retry=n times before giving up. Once
the filesystem is mounted, each NFS request made in the ker-
nel waits timeo=n tenths of a second for a response. If no
response arrives, the time-out is multiplied by 2 and the
request is retransmitted. When retrans=n retransmissions
have been sent with no reply a soft mounted filesystem
returns an error on the request and a hard mounted filesys-
tem retries the request. Filesystems that are mounted rw
(read-write) should use the hard option. The number of
bytes in a read or write request can be set with the rsize
and wsize options.
UMOUNT OPTIONS
-h host
Unmount all filesystems listed in /etc/mtab that are
remote-mounted from host.
-a Attempt to unmount all the filesystems currently
mounted (listed in /etc/mtab). In this case, fsname is
taken from /etc/mtab.
-k Call fuser -k <directory> on all directories which are
unmountable.
-t Unmounts all filesystems of a given filesystem type.
The accepted types are ffs, ufs, 4.3, local and nfs.
-v Verbose - umount displays a message indicating the
filesystem being unmounted.
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EXAMPLES
mount /dev/xy0g /usr mount a local disk
mount -at ffs mount all ffs filesystems
mount -t nfs serv:/usr/src /usr/srcmount remote filesystem
mount serv:/usr/src /usr/src same as above
mount -o hard serv:/usr/src /usr/srcsame as above but hard mount
mount -p > /etc/fstab save current mount state
FILES
/etc/mtab mount table
/etc/fstab filesystem table
SEE ALSO
fuser(1M), mountd(1M), nfsd(1M).
nfsmount(2), fstab(4), proc(4) in the Programmer's Reference
Manual.
ERRORS
Mounting filesystems full of garbage crashes the system.
If the directory on which a filesystem is to be mounted is a
symbolic link, the filesystem is mounted on the directory to
which the symbolic link refers, rather than being mounted on
top of the symbolic link itself.
ORIGIN
Sun Microsystems
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