266 lines
6.3 KiB
Groff
266 lines
6.3 KiB
Groff
.\"
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.\" Copyright (c) 2001 Dima Dorfman <dd@FreeBSD.org>
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd May 26, 2001
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.Dt MDMFS 8
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.Os
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.Sh NAME
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.Nm mdmfs
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.Nd configure and mount an in-memory filesystem using the
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.Xr md 4
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driver
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.Sh SYNOPSIS
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.Nm
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.Op Fl DLMNSX
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.Op Fl a Ar maxcontig
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.Op Fl b Ar block-size
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.Op Fl c Ar cylinders
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.Op Fl d Ar rotdelay
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.Op Fl e Ar maxbpg
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.Op Fl F Ar file
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.Op Fl f Ar frag-size
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.Op Fl i Ar bytes
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.Op Fl m Ar percent-free
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.Op Fl n Ar rotational-positions
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.Op Fl O Ar optimization
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.Op Fl o Ar mount-options
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.Op Fl p Ar permissions
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.Op Fl s Ar size
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.Op Fl w Ar user : Ns Ar group
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.Ar md-device
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.Ar mount-point
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.Sh DESCRIPTION
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The
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.Nm
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program is designed to be a work-alike and look-alike of the deprecated
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.Xr mount_mfs 8 .
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The end result is essentially the same,
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but is accomplished in a completely different way.
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.Nm
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configures an
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.Xr md 4
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disk using
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.Xr mdconfig 8 ,
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labels it using
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.Xr disklabel 8 ,
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puts a UFS filesystem on it using
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.Xr newfs 8 ,
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and mounts it using
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.Xr mount 8 .
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All the command line options are passed to the appropriate program
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at the appropriate stage in order to achieve the desired effect.
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.Pp
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By default,
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.Nm
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creates a swap-based
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.Pq Dv MD_SWAP
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disk with soft-updates enabled
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and mounts it on
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.Ar mount-point .
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It uses the
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.Xr md 4
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device specified by
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.Ar md-device .
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If
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.Ar md-device
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is
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.Ql md
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(no unit number),
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it will use
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.Xr md 4 Ns 's
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auto-unit feature to automatically select an unused device.
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Unless otherwise specified with one of the options below,
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it uses the default arguments to all the helper programs.
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.Pp
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The following options are available.
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Where possible,
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the option letter matches the one used by
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.Xr mount_mfs 8
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for the same thing.
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.Bl -tag -width indent
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.It Fl a Ar maxcontig
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Specify the maximum number of contiguous blocks that will be laid
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out before forcing a rotational delay
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(see the
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.Fl d
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option).
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.It Fl b Ar block-size
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The block size of the filesystem, in bytes.
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.It Fl c Ar cylinders
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The number of cylinders per cylinder group in the filesystem.
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.It Fl D
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If not using auto-unit,
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do not run
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.Xr mdconfig 8
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to try to detach the unit before attaching it.
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.It Fl d Ar rotdelay
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Specify the mininum time in milliseconds required to initiate another
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disk transfer on the same cylinder.
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Modern disks with read/write-behind achieve higher performance without
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this feature,
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so it is best to leave it at 0 milliseconds.
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.It Fl e Ar maxbpg
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Indicate the maximum number of blocks any single file can allocate
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out of a cylinder group before it is forced to begin allocating
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blocks from another cylinder group.
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.It Fl F Ar file
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Create a vnode-backed
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.Pq Dv MD_VNODE
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memory disk backed by
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.Ar file .
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.It Fl f Ar frag-size
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The fragment size of the filesystem in bytes.
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.It Fl i Ar bytes
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Number of bytes per inode.
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.It Fl L
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Show the output of the helper programs.
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By default,
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it is sent to
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.Pa /dev/null .
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.It Fl M
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Create a
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.Xr malloc 9
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backed disk
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.Pq Dv MD_MALLOC
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instead of a swap-backed disk.
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.It Fl m Ar percent-free
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The percentage of space reserved for the superuser.
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.It Fl N
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Do not actually run the helper programs.
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This is most useful in conjunction with
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.Fl X .
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.It Fl n Ar rotational-positions
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The default number of rotational positions to distinguish.
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.It Fl O Ar optimization
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Select the optimization preference;
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valid choices are
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.Cm space
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and
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.Cm time ,
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which will optimize for minimum space fragmentation and
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minimum time spent allocating blocks,
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respectively.
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.It Fl o Ar mount-options
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Specify the mount options with which to mount the filesystem.
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See
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.Xr mount 8
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for more information.
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.It Fl p Ar permissions
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Set the file (directory) permissions of the mount point
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.Ar mount-point
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to
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.Ar permissions .
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.It Fl S
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Do not enable soft-updates on the filesystem.
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.It Fl s Ar size
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Specify the size of the disk to create.
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This only makes sense if
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.Fl F
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is
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.Em not
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specified.
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That is,
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this will work for the default swap-backed
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.Pq Dv MD_SWAP
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disks,
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and the optional
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.Pq Fl M
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.Xr malloc 9
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backed disks
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.Pq Dv MD_MALLOC .
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.It Fl w Ar user : Ns Ar group
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Set the owner and group to
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.Ar user
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and
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.Ar group ,
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respectively.
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The arguments have the same semantics as with
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.Xr chown 8 ,
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but specifying just a
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.Ar user
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or just a
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.Ar group
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is not supported.
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.El
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.Pp
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The
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.Fl F
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and
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.Fl s
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options are passed to
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.Xr mdconfig 8
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as
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.Fl f
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and
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.Fl s ,
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respectively.
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The
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.Fl a , b , c , d , e , f , i , m
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and
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.Fl n
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options are passed to
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.Xr newfs 8
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with the same letter;
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the
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.Fl O
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option is passed to
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.Xr newfs 8
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as
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.Fl o .
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The
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.Fl o
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option is passed to
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.Xr mount 8
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with the same letter.
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See the programs that the options are passed to for more information
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on their semantics.
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.Sh EXAMPLES
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Create and mount a 32 megabyte swap-backed filesystem on
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.Pa /tmp :
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.Pp
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.Dl "mdmfs -s 32m md /tmp"
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.Pp
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Create and mount a 16 megabyte malloc-backed filesystem on
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.Pa /tmp
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using the
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.Pa /dev/md1
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device;
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furthermore,
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do not use soft-updates on it and mount it
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.Cm async :
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.Pp
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.Dl "mdmfs -M -S -o async -s 16m md1 /tmp"
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.Sh SEE ALSO
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.Xr md 4 ,
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.Xr disklabel 8 ,
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.Xr mdconfig 8 ,
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.Xr mount 8 ,
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.Xr newfs 8
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.Sh AUTHORS
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.An Dima Dorfman
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.Aq dd@FreeBSD.org
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