linux-kernel - Re: fastboot/async and initramfs: How am I supposed to know when?devices are finished initializing?

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Message-id: <49D12986.6060206@archlinux.org>
Date:	Mon, 30 Mar 2009 22:20:22 +0200
From:	Thomas Bächler <thomas@...hlinux.org>
To:	Alexander Clouter <alex@...riz.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: fastboot/async and initramfs: How am I supposed to know
 when?devices are finished initializing?

Alexander Clouter schrieb:
> If the user is specifying the boot device, could you not 'teach' them to 
> LABEL the boot device and live off something slightly more fancy (but 
> akin to) the following:
> 
> ----
> while true
> do
>   mount LABEL=root /whatever
> 
>   if [ $? -eq 0 ]; then
>     break
>   fi
> 
>   # do some md and lvm magic dance here
> 
>   sleep 1
> done
> ----
> 
> Your initramfs could do extra steps everytime the loop...erm...loops.
> 
> Now of course the downside is LABELing mounted devices, XFS for example, 
> is not an easy thing to do... :-/

We do use UUIDs (or LABELs), but that doesn't solve the LVM problem, 
because the given device "/dev/somevg/somelv" only appears after LVM has 
been activated! I am thinking about using udev scan for LVM volume 
groups each time a hard drive appear that contains an LVM device. But 
that is a topic for another place.

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