Date: Sun, 18 Oct 2015 14:55:09 +0000 (UTC) From: Edward Tomasz Napierala <trasz@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r289517 - stable/10/sbin/mdconfig Message-ID: <201510181455.t9IEt9ZH099497@repo.freebsd.org>
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Author: trasz Date: Sun Oct 18 14:55:09 2015 New Revision: 289517 URL: https://svnweb.freebsd.org/changeset/base/289517 Log: MFC r286360: Tweak mdconfig(8) manual page, in particular revise the EXAMPLES section. This removes stuff that doesn't really belong there, and simplifies examples for the basic operations. MFC r286361: Whoops, wrong flag. Sponsored by: The FreeBSD Foundation Modified: stable/10/sbin/mdconfig/mdconfig.8 Directory Properties: stable/10/ (props changed) Modified: stable/10/sbin/mdconfig/mdconfig.8 ============================================================================== --- stable/10/sbin/mdconfig/mdconfig.8 Sun Oct 18 14:52:31 2015 (r289516) +++ stable/10/sbin/mdconfig/mdconfig.8 Sun Oct 18 14:55:09 2015 (r289517) @@ -41,12 +41,12 @@ .\" .\" $FreeBSD$ .\" -.Dd November 30, 2013 +.Dd August 6, 2015 .Dt MDCONFIG 8 .Os .Sh NAME .Nm mdconfig -.Nd configure and enable memory disks +.Nd create and control memory disks .Sh SYNOPSIS .Nm .Fl a @@ -79,7 +79,7 @@ .Sh DESCRIPTION The .Nm -utility configures and enables +utility creates and controls .Xr md 4 devices. .Pp @@ -107,7 +107,7 @@ If the .Fl o Cm reserve option is not set, creating and filling a large malloc-backed memory disk is a very easy way to -panic a system. +panic the system. .It Cm vnode A file specified with .Fl f Ar file @@ -168,7 +168,9 @@ or .Cm t which denotes byte, kilobyte, megabyte, gigabyte and terabyte respectively. -The +When used without the +.Fl r +option, the .Fl a and .Fl t Ar swap @@ -210,6 +212,11 @@ Enable/disable compression features to r .It Oo Cm no Oc Ns Cm force Disable/enable extra sanity checks to prevent the user from doing something that might adversely affect the system. +This can be used with the +.Fl d +flag to forcibly destroy an +.Xr md 4 +disk that is still in use. .It Oo Cm no Oc Ns Cm readonly Enable/disable readonly mode. .El @@ -231,66 +238,58 @@ is provided for convenience as an abbrev .Fl t Ar vnode .Fl f Ar file . .Sh EXAMPLES -Create a 4 megabyte -.Xr malloc 9 -backed memory disk. -The name of the allocated unit will be printed on stdout, such as -.Dq Li md3 : -.Pp -.Dl mdconfig -a -t malloc -s 4m -.Pp -Create a disk named -.Pa /dev/md4 -with +Create a disk with .Pa /tmp/boot.flp -as backing storage: +as backing storage. +The name of the allocated unit will be printed on stdout, such as +.Dq Li md0 : +.Bd -literal -offset indent +mdconfig /tmp/boot.flp +.Ed .Pp -.Dl mdconfig -a -t vnode -f /tmp/boot.flp -u md4 +Create a 1 gigabyte swap backed memory disk named +.Dq Li md3 : +.Bd -literal -offset indent +mdconfig -s 1g -u md3 +.Ed .Pp Detach and free all resources used by -.Pa /dev/md4 : +.Pa /dev/md3 : +.Bd -literal -offset indent +mdconfig -du md3 +.Ed +.Pp +Show detailed information on current memory disks: +.Bd -literal -offset indent +mdconfig -lv +.Ed .Pp -.Dl mdconfig -d -u md4 +Resize the +.Dq Li md3 +memory disk to 2 gigabytes: +.Bd -literal -offset indent +mdconfig -rs 2g -u md3 +.Ed .Pp -Create a 128MByte swap backed disk, initialize an +Create a 1 gigabyte swap backed disk, initialize an .Xr ffs 7 file system on it, and mount it on .Pa /tmp : .Bd -literal -offset indent -mdconfig -a -t swap -s 128M -u md10 +mdconfig -s 1g -u md10 newfs -U /dev/md10 mount /dev/md10 /tmp chmod 1777 /tmp .Ed .Pp -Create a 5MB file-backed disk -.Po Fl a -and -.Fl t Ar vnode -are implied -.Pc : -.Bd -literal -offset indent -dd if=/dev/zero of=somebackingfile bs=1k count=5k -mdconfig -f somebackingfile -u md0 -bsdlabel -w md0 auto -newfs md0c -mount /dev/md0c /mnt -.Ed -.Pp -Create an -.Xr md 4 -device out of an ISO 9660 CD image file -.Po Fl a -and -.Fl t Ar vnode -are implied -.Pc , using the first available +Create a memory disk out of an ISO 9660 CD image file, +using the first available .Xr md 4 -device, and then mount the new memory disk: +device, and then mount it: .Bd -literal -offset indent mount -t cd9660 /dev/`mdconfig -f cdimage.iso` /mnt -.Pp .Ed +.Pp Create a file-backed device from a hard disk image that begins with 512K of raw header information. .Xr gnop 8 @@ -298,7 +297,7 @@ is used to skip over the header informat .Pa md1.nop to the start of the filesystem in the image. .Bd -literal -offset indent -mdconfig -f diskimage.img -u md1 +mdconfig -u md1 -f diskimage.img gnop create -o 512K md1 mount /dev/md1.nop /mnt .Ed
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