http://qa.mandrakesoft.com/show_bug.cgi?id=3600
------- Additional Comments From [EMAIL PROTECTED] 2003-03-29 23:20 -------
Oh, *wow*. That's so clever. I love it. We could even have resizing of /
in diskdrake (effectively) with this! Just allow diskdrake to expand the
device, and then it tells you to reboot to complete the resizing.
Insane. Can we please please pretty please have this? :)
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assigned_to: [EMAIL PROTECTED]
status: UNCONFIRMED
creation_date:
description:
Until online resizing of ext3 comes along in 2.6 (we can hope), we have the
problem that to resize the root filesystem (assuming it's on an underlying
resizable device, like LVM for instance), we have to unmount it.
But how to do that? One way is to boot via CD-ROM or floppy or some other
clumsy method. But much better, is to have the initrd resize the filesystem
before mounting it! And the best part is that it's braindead simple to do.
The following patch to mkinitrd adds ext2resize to the initrd and modifies the
linuxrc to always try to expand the root filesystem to the size of it's
underlying device. If it's already as big as the device, nothing happens. If
the device is bigger, the filesystem is expanded to it's size.
So to increase the size of the root filesystem, one simply expands the device
it's on ("lvextend -L+20M /dev/rootvol/root" for example) and then reboots!
This technique could be used in the initscripts to resize other "difficult to
unmount" filesystems like /var, although that can be done relatively simply by
switching to single user mode. But I digress. The patch to mkinitrd:
--- /sbin/mkinitrd 2003-02-18 09:26:23.000000000 -0500
+++ /tmp/mkinitrd 2003-03-29 12:49:19.000000000 -0500
@@ -503,6 +503,7 @@
INITRDFILES="/sbin/vgchange /sbin/vgscan"
cp -aL /sbin/vgchange $MNTIMAGE/sbin
cp -aL /sbin/vgscan $MNTIMAGE/sbin
+ cp -aL /sbin/ext2resize $MNTIMAGE/sbin
cp -aL /lib/libc.so.6 $MNTIMAGE/lib
cp -aL /lib/ld-linux.so.2 $MNTIMAGE/lib
fi
@@ -583,11 +584,13 @@
if [ -n "$lvmroot" ]; then
echo "echo Configuring LVM" >> $RCFILE
echo "/sbin/vgscan" >> $RCFILE
- echo "/sbin/vgchange -a y" >> $RCFILE
+ echo "/sbin/vgchange -A n -a y" >> $RCFILE
IMAGESIZE=$[IMAGESIZE + 5000]
fi
echo "umount /proc" >> $RCFILE
+echo "echo Growing root filesystem (if needed)" >> $RCFILE
+echo "/sbin/ext2resize $rootdev" >> $RCFILE
[ -n "$rootfsopts" ] && rootfsopts_msg="with flags $rootfsopts"
echo "echo Mounting root filesystem $rootfsopts_msg" >> $RCFILE
echo "mount --ro -t $rootfs $rootdev /sysroot $rootfsopts" >> $RCFILE
Before this is really useful, ext2resize needs to be updated to the latest
release (CVS). I have prodded the maintainer to cut a new "official" (1.1.18)
release, so hopefully that happens soon.
I preferred to use ext2resize because resize2fs requires libext2 as well as fsck
which starts to make the initrd get large.
