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<H1>[Mageia-dev] New dracut - please test</H1>
<B>Colin Guthrie</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20New%20dracut%20-%20please%20test&In-Reply-To=%3C4F4B767D.9050307%40colin.guthr.ie%3E"
TITLE="[Mageia-dev] New dracut - please test">mageia at colin.guthr.ie
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<I>Mon Feb 27 13:26:37 CET 2012</I>
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<PRE>'Twas brillig, and Colin Guthrie at 25/02/12 10:59 did gyre and gimble:
><i> 'Twas brillig, and David W. Hodgins at 25/02/12 07:35 did gyre and gimble:
</I>>><i> On Fri, 24 Feb 2012 06:42:01 -0500, Colin Guthrie
</I>>><i> <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">mageia at colin.guthr.ie</A>> wrote:
</I>>><i>
</I>>>><i> The other big change here is to automatically generate a much bigger
</I>>>><i> initramfs when doing an upgrade from mga1. This will include a lot more
</I>>>><i> stuff (e.g. lvm, raid etc) that may or may not be needed on a given
</I>>>><i> setup, but until you boot with dracut you cannot generate an initramfs
</I>>>><i> that will be able to detect only what is needed for boot.
</I>>><i>
</I>>><i> Looking at the current version of the init script, it's clear
</I>>><i> what the problem is ...
</I>>><i>
</I>>><i> check_finished && break
</I>>><i>
</I>>><i> udevsettle
</I>>><i>
</I>>><i> check_finished && break
</I>>><i>
</I>>><i> The above statement will always be true on a single core
</I>>><i> system, so the following code never gets executed.
</I>><i>
</I>><i> As I've said before, I really do not think this is anything to do with
</I>><i> number of cores. I do see that there is a chicken and egg problem, but
</I>><i> why would the number of cores affect this? Nothing runs in the
</I>><i> background here.
</I>><i>
</I>><i> As stated earlier
</I>><i> (<A HREF="https://www.mageia.org/pipermail/mageia-dev/2012-February/011709.html">https://www.mageia.org/pipermail/mageia-dev/2012-February/011709.html</A>),
</I>><i> the problem is simply that there are no calls to wait_for_dev for the
</I>><i> lvm drives and thus the whole initqueue stuff just glosses over things
</I>><i> and doesn't ever activate them.
</I>><i>
</I>><i> What is different to the last time is that now for hostonly initrds (not
</I>><i> the one you generated), the wait_for_dev call WILL be added. I had hoped
</I>><i> this different approach would have fixed your problem.
</I>><i>
</I>><i> However, due to me now doing this fallback non-hostonly initrd, the
</I>><i> original problem still manifests itself.
</I>><i>
</I>><i> Can you test that generating a new initrd after booting via dracut (and
</I>><i> thus getting a hostonly one) does actually activate your usr partition?
</I>><i> I'm not 100% convinced there will not still be a problem with the
</I>><i> "resume" support and swap partitions, but it will hopefully give you a
</I>><i> smooth boot even if resume support is busted.
</I>><i>
</I>><i> The non-hostonly problem does need a fix and I'll see what can be done.
</I>
Just for reference, here is my conversation with Harald Hoyer (dracut
upstream guy):
Me: haraldh, I've got a problem case with lvm again :)
Me: haraldh, It was the same problem I had before, but it was solved in
latest dracut with the specific cmdline files and specifically waiting
for the known needed lvms.
Me: haraldh, but sadly when building a non-hostonly initrd, no
wait_for_dev calls are put in for the lvms and it can lead to problems
when /usr is on lvm as the initqueue exits and no wait_for_dev for the
/usr partition is ever issues and it cannot be mounted.
Harald: coling, ah, yes... we have to redesign dracut there and put the
mount hook in the main loop
He did have a work around suggestion too tho', which I'll have to think
about and code for, but on the surface it could provide a good stop gap
without too much re-engineering.
Col
--
Colin Guthrie
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