afbe178ee2
0: No output. Default for mount_mfs unless -N specified
1: Output size of partition and cylinder groups.
2: Follow with a progress-bar line of dots (scaled to finish at RH margin)
3: Include a single line of alternate suberblock addresses before progress
bar. Default for newfs.
4: Output lots of lines of alternate superblock numbers that scroll madly
up the screen.
If -N given, newfs/mount_mfs exits before displaying any progress bar.
Output constrained (almost always) to 1 column less than the terminal width.
283 lines
7.8 KiB
Groff
283 lines
7.8 KiB
Groff
.\" $NetBSD: mount_mfs.8,v 1.14 2006/01/15 19:49:25 dsl Exp $
|
|
.\"
|
|
.\" Copyright (c) 1983, 1987, 1991, 1993, 1994
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)newfs.8 8.6 (Berkeley) 5/3/95
|
|
.\"
|
|
.Dd January 15, 2006
|
|
.Dt MOUNT_MFS 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm mount_mfs
|
|
.Nd mount a memory based file system
|
|
.Sh SYNOPSIS
|
|
.Nm mount_mfs
|
|
.Op Fl N
|
|
.Op Fl a Ar maxcontig
|
|
.Op Fl b Ar block-size
|
|
.Op Fl d Ar rotdelay
|
|
.Op Fl e Ar maxbpg
|
|
.Op Fl f Ar frag-size
|
|
.Op Fl g Ar groupname
|
|
.Op Fl i Ar bytes-per-inode
|
|
.Op Fl m Ar free-space
|
|
.Op Fl n Ar inodes
|
|
.Op Fl o Ar options
|
|
.Op Fl p Ar permissions
|
|
.Op Fl s Ar size
|
|
.Op Fl u Ar username
|
|
.Op Fl V Ar verbose
|
|
.Ar special node
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
is used to build a file system in virtual memory and then mount it
|
|
on a specified node.
|
|
.Nm
|
|
exits and the contents of the file system are lost
|
|
when the file system is unmounted.
|
|
If
|
|
.Nm
|
|
is sent a signal while running,
|
|
for example during system shutdown,
|
|
it will attempt to unmount its
|
|
corresponding file system.
|
|
.Ar special
|
|
is ignored.
|
|
.Pp
|
|
Options with numeric arguments may contain an optional (case-insensitive)
|
|
suffix:
|
|
.Bl -tag -width 3n -offset indent -compact
|
|
.It b
|
|
Bytes; causes no modification.
|
|
(Default)
|
|
.It k
|
|
Kilo; multiply the argument by 1024
|
|
.It m
|
|
Mega; multiply the argument by 1048576
|
|
.It g
|
|
Giga; multiply the argument by 1073741824
|
|
.El
|
|
.Pp
|
|
The following options define the general layout policies:
|
|
.Bl -tag -width Fl
|
|
.It Fl N
|
|
Causes the memory file system parameters to be printed out
|
|
without really mounting the memory file system.
|
|
.It Fl a Ar maxcontig
|
|
This specifies the maximum number of contiguous blocks that will be
|
|
laid out before forcing a rotational delay (see the
|
|
.Fl d
|
|
option).
|
|
The default value is 8.
|
|
See
|
|
.Xr tunefs 8
|
|
for more details on how to set this option.
|
|
.It Fl b Ar block-size
|
|
The block size of the file system, in bytes.
|
|
It must be a power of two.
|
|
The smallest allowable size is 4096 bytes.
|
|
The default size depends upon the size of the file system:
|
|
.Pp
|
|
.Bl -tag -width "file system size" -compact -offset indent
|
|
.It Sy "file system size"
|
|
.Ar block-size
|
|
.It \&\*[Lt] 20 MB
|
|
4 KB
|
|
.It \&\*[Lt] 1024 MB
|
|
8 KB
|
|
.It \&\*[Gt]\&= 1024 MB
|
|
16 KB
|
|
.El
|
|
.It Fl d Ar rotdelay
|
|
This specifies the expected time (in milliseconds) to service a transfer
|
|
completion interrupt and initiate a new transfer on the same disk.
|
|
The default is 0 milliseconds.
|
|
See
|
|
.Xr tunefs 8
|
|
for more details on how to set this option.
|
|
.ne 1i
|
|
.It Fl e Ar maxbpg
|
|
This indicates the maximum number of blocks any single file can
|
|
allocate out of a cylinder group before it is forced to begin
|
|
allocating blocks from another cylinder group.
|
|
The default is about one quarter of the total blocks in a cylinder group.
|
|
See
|
|
.Xr tunefs 8
|
|
for more details on how to set this option.
|
|
.It Fl f Ar frag-size
|
|
The fragment size of the file system in bytes.
|
|
It must be a power of two ranging in value between
|
|
.Ar block-size Ns /8
|
|
and
|
|
.Ar block-size .
|
|
The optimal
|
|
.Ar block-size : Ns Ar frag-size
|
|
ratio is 8:1.
|
|
Other ratios are possible, but are not recommended,
|
|
and may produce unpredictable results.
|
|
The default size depends upon the size of the file system:
|
|
.Pp
|
|
.Bl -tag -width "file system size" -compact -offset indent
|
|
.It Sy "file system size"
|
|
.Ar frag-size
|
|
.It \&\*[Lt] 20 MB
|
|
0.5 KB
|
|
.It \&\*[Lt] 1024 MB
|
|
1 KB
|
|
.It \&\*[Gt]\&= 1024 MB
|
|
2 KB
|
|
.El
|
|
.It Fl g Ar groupname
|
|
This specifies the group name or group id of the root
|
|
inode of the file system.
|
|
.It Fl i Ar bytes-per-inode
|
|
This specifies the density of inodes in the file system.
|
|
If fewer inodes are desired, a larger number should be used;
|
|
to create more inodes a smaller number should be given.
|
|
The default is to create an inode for every
|
|
.Pq 4 * Ar frag-size
|
|
bytes of data space:
|
|
.Pp
|
|
.Bl -tag -width "file system size" -compact -offset indent
|
|
.It Sy "file system size"
|
|
.Ar bytes-per-inode
|
|
.It \&\*[Lt] 20 MB
|
|
2 KB
|
|
.It \&\*[Lt] 1024 MB
|
|
4 KB
|
|
.It \&\*[Gt]\&= 1024 MB
|
|
8 KB
|
|
.El
|
|
.It Fl m Ar free-space
|
|
The percentage of space reserved from normal users; the minimum free
|
|
space threshold.
|
|
The default value used is 5%.
|
|
See
|
|
.Xr tunefs 8
|
|
for more details on how to set this option.
|
|
.It Fl n Ar inodes
|
|
This specifies the number of inodes for the filesystem.
|
|
If both
|
|
.Fl i
|
|
and
|
|
.Fl n
|
|
are specified then
|
|
.Fl n
|
|
takes precedence.
|
|
.It Fl o
|
|
Options are specified with a
|
|
.Fl o
|
|
flag followed by a comma separated string of options.
|
|
See the
|
|
.Xr mount 8
|
|
man page for possible options and their meanings.
|
|
.It Fl p Ar permissions
|
|
This specifies the permissions of the root
|
|
inode of the file system.
|
|
.It Fl s Ar size
|
|
The size of the file system in sectors.
|
|
An
|
|
.Sq s
|
|
suffix will be interpreted as the number of sectors (the default).
|
|
All other suffixes are interpreted as per other numeric arguments,
|
|
except that the number is converted into sectors by dividing by the
|
|
sector size (as specified by
|
|
.Fl S Ar secsize )
|
|
after suffix interpretation.
|
|
.It Fl u Ar username
|
|
This specifies the user name or user id of the root
|
|
inode of the file system.
|
|
.It Fl V Ar verbose
|
|
This controls the amount of information written to stdout:
|
|
.Bl -tag -width 3n -offset indent -compact
|
|
.It 0
|
|
No output
|
|
.It 1
|
|
Overall size and cylinder group details.
|
|
.It 2
|
|
A progress bar (dots ending at right hand margin).
|
|
.It 3
|
|
The first few super-block backup sector numbers are displayed before the
|
|
progress bar.
|
|
.It 4
|
|
All the super-block backup sector numbers are displayed (no progress bar).
|
|
.El
|
|
The default is 0.
|
|
If
|
|
.Fl N
|
|
is specifed
|
|
.Nm
|
|
stops before outputting the progress bar.
|
|
.El
|
|
.Sh NOTES
|
|
The owner and group ids of the root node of the new file system
|
|
are set to the effective uid and gid of the user mounting
|
|
the file system.
|
|
.Sh EXAMPLES
|
|
Mount a 32 MB mfs on /tmp:
|
|
.Pp
|
|
.Dl mount_mfs -s 32m swap /tmp
|
|
.Sh SEE ALSO
|
|
.Xr disktab 5 ,
|
|
.Xr fs 5 ,
|
|
.Xr disklabel 8 ,
|
|
.Xr diskpart 8 ,
|
|
.Xr dumpfs 8 ,
|
|
.\" .Xr format 8 ,
|
|
.Xr fsck_ffs 8 ,
|
|
.Xr fsirand 8 ,
|
|
.Xr mount 8 ,
|
|
.Xr newfs 8 ,
|
|
.Xr tunefs 8
|
|
.Rs
|
|
.%A M. McKusick
|
|
.%A W. Joy
|
|
.%A S. Leffler
|
|
.%A R. Fabry
|
|
.%T A Fast File System for UNIX ,
|
|
.%J ACM Transactions on Computer Systems 2
|
|
.%V 3
|
|
.%P pp 181-197
|
|
.%D August 1984
|
|
.%O (reprinted in the BSD System Manager's Manual)
|
|
.Re
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
command appeared in
|
|
.Bx 4.2 .
|
|
.Sh BUGS
|
|
The
|
|
.Cm async
|
|
.Xr mount 8
|
|
option is currently disabled in this file system because it causes
|
|
hangs when writing lots of data.
|
|
The problem is that MFS needs to allocate pages to clean pages, so if
|
|
it waits until the last minute to clean pages then there may not be
|
|
any of them available to do the cleaning.
|