Date: Mon, 29 Jan 2001 18:23:44 +0200 From: Sheldon Hearn <sheldonh@uunet.co.za> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: mjacob@feral.com, Matt Dillon <dillon@earth.backplane.com>, John Baldwin <jhb@freebsd.org>, cvs-all@freebsd.org, cvs-committers@freebsd.org, Mikhail Teterin <mi@aldan.algebra.com> Subject: Re: workaround for broken mfs using vn. (was Re: cvs commit: src/sys/i386/conf GENERIC ) Message-ID: <625.980785424@axl.fw.uunet.co.za> In-Reply-To: Your message of "Mon, 29 Jan 2001 15:21:21 %2B0100." <21404.980778081@critter>
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On Mon, 29 Jan 2001 15:21:21 +0100, Poul-Henning Kamp wrote:
> Uhm, I'm not that KLD savy, but there is no code in md(4) to support unloading
> and consequently, it is at best a bad idea.
That's fine. The md(4) page doesn't actually suggest that you _can_
unload it, so we're fine for now. Ideally, this should either work for
5.0-RELEASE, or the module build should be disabled for the release.
By the way, the patch below would make it much easier for folks to use
a swap-backed /tmp in future.
Ciao,
Sheldon.
Index: etc/rc
===================================================================
RCS file: /home/ncvs/src/etc/rc,v
retrieving revision 1.250
diff -u -d -r1.250 rc
--- etc/rc 2001/01/21 20:57:13 1.250
+++ etc/rc 2001/01/29 16:17:47
@@ -196,6 +196,23 @@
;;
esac
+case ${swap_backed_tmp_size} in
+[Nn][Oo] | '')
+ ;;
+*)
+ echo 'Mounting swap-backed /tmp'
+ if ! kldstat -v | grep -E ' md(\.ko|)$' > /dev/null; then
+ kldload md > /dev/null 2>&1
+ fi
+ unit=`mdconfig -a -t swap -o reserve -s ${swap_backed_tmp_size}`
+ disklabel -r -w ${unit} auto
+ newfs -f 4096 /dev/${unit}c
+ tunefs -n enable /dev/${unit}c
+ mount /dev/${unit}c /tmp
+ chmod ${swap_backed_tmp_perm} /tmp
+ ;;
+esac
+
umount -a >/dev/null 2>&1
# Mount everything except nfs filesystems.
Index: etc/defaults/rc.conf
===================================================================
RCS file: /home/ncvs/src/etc/defaults/rc.conf,v
retrieving revision 1.88
diff -u -d -r1.88 rc.conf
--- etc/defaults/rc.conf 2001/01/25 13:05:50 1.88
+++ etc/defaults/rc.conf 2001/01/29 16:17:18
@@ -324,6 +324,8 @@
kern_securelevel_enable="NO" # kernel security level (see init(8)),
kern_securelevel="-1" # range: -1..3 ; `-1' is the most insecure
update_motd="YES" # update version info in /etc/motd (or NO)
+swap_backed_tmp_size="NO" # Size of swapped-backed md(4) /tmp (or NO)
+swap_backed_tmp_perm="1777" # Permissions on swapp-backed /tmp
start_vinum="" # set to YES to start vinum
unaligned_print="YES" # print unaligned access warnings on the alpha (or NO).
entropy_file="/entropy" # Set to NO to disable caching entropy through reboots.
Index: share/man/man5/rc.conf.5
===================================================================
RCS file: /home/ncvs/src/share/man/man5/rc.conf.5,v
retrieving revision 1.89
diff -u -d -r1.89 rc.conf.5
--- share/man/man5/rc.conf.5 2001/01/21 20:57:38 1.89
+++ share/man/man5/rc.conf.5 2001/01/29 16:22:36
@@ -77,6 +77,33 @@
.Ar NO
then no swapfile is installed, otherwise the value is used as the full
pathname to a file to use for additional swap space.
+.It Ar swap_backed_tmp_size
+(str) If set to
+.Ar NO
+then
+.Pa /tmp
+is left as is.
+Otherwise, the value is used as the size of an
+swap-backed
+.Xr md 4
+disk to create.
+Once the disk is created,
+it is mounted on
+.Pa /tmp .
+See
+.Xr mdconfig 8
+for legal size values.
+.It Ar swap_backed_tmp_perm
+(str) If
+.Ar swap_backed_tmp_size
+is not
+.Ar NO
+then this value is used to set the
+permissions on
+.Pa /tmp
+once the swap-backed
+.Xr md 4
+disk is mounted on it.
.It Ar apm_enable
(bool) If set to
.Ar YES ,
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