Uwe Menges wrote:
> The LUKS part seems to succeed as you can access decrypted volume and see it's
> lvm2. And the LVM part doesn't work. Did you try a manual pvscan/vgscan after
> you get into the fallback shell?
Unfortunately neither vgscan nor pvscan are in the initramfs. I tried
adding vgscan manually, approximately like this:
zcat /boot/initrd.img-2.6.26|cpio -i
cp /sbin/vgscan sbin
cp /boot/initrd.img-2.6.26 /boot/initrd.img-2.6.26-aside
find . | cpio -o | gzip >/boot/initrd.img-2.6.26
However, I only got a message about an incomplete write and a kernel panic.
> And I neither know your setup nor how LUKS/LVM works behind the curtain in
> detail, but CONFIG_DM_UEVENT may be important to trigger exactly the step you
> seem to be missing.
I don't have that configured in either 2.6.26 (which fails) or in
2.6.24 (which works okay).
$ grep UEVENT config-2.6.2*
config-2.6.24:CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
config-2.6.24:# CONFIG_DM_UEVENT is not set
config-2.6.26:CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
config-2.6.26:# CONFIG_DM_UEVENT is not set
Could that be a new dependency?
Clemens Fruhwirth wrote:
>
> In my opinion, that points to the LVM2 tools doing something
> odd. Probably compare version numbers of vgchange, but I doubt that
> LVM introduced a bug. Rather check /etc/lvm/lvm.conf in the
> initramfs. It should contain something like
>
> devices {
> scan = [ "/dev/" ]
> filter = [ "a|^/dev/mapper/|", "a|^/dev/sd|", "a|^/dev/loop|", "r/.*/" ]
> ..
> }
>
> The scan line is most likely there, but filters is sometimes fiddled
> with. A string starting with 'a' means accept, 'r' means reject. You
> want the path "a|^/dev/mapper|" to be scanned and not
> rejected. (^/dev/mapper is a regexp). filter = ["a/.*/"] is also ok.
After a boot fails and it drops into a shell, /etc/lvm is an empty
directory. In an unpacked initramfs (for either kernel), there is no
/etc/lvm at all, nor a file lvm.conf anywhere in the filesystem. So
either lvm is running without a configuration file, or else it gets
created by some other magic.
After a successful boot, I find this:
$ grep filter /etc/lvm/lvm.conf
# A filter that tells LVM2 to only use a restricted set of devices.
# The filter consists of an array of regular expressions. These
# Don't have more than one filter line active at once: only one gets used.
# filter = [ "a/.*/" ]
filter = [ "r|/dev/cdrom|" ]
# filter = [ "a/loop/", "r/.*/" ]
# filter =[ "a|loop|", "r|/dev/hdc|", "a|/dev/ide|", "r|.*|" ]
# filter = [ "a|^/dev/hda8$|", "r/.*/" ]
# The results of the filtering are cached on disk to avoid
so it apparently defaults to accepting anything not on a cdrom.
> If everything fails, copy strace into the initramfs and have a look at
> what's going on when running vgchange.
I'll try this next. My first attempt at adding a program to an
initramfs failed (above), but I'll investigate further.
- Jim Van Zandt
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