initramfs support

[Bryan Kadzban]

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Alexander E. Patrakov wrote:
>> The one sticking point is the same sticking point I had with dmraid
>> -- how do you get the /dev/md/* named device nodes to be recreated
>> once the initramfs is finished, from the system bootscripts?
> 
> I think that it cannot be supported. I will test now to see whether
> Debian can be installed on such /dev/md/meaningful_name array.

Not sure what the testing came up with, but I figured out a way to get
it to work:

mkdir /dev/md

for array in /dev/md[0-9]* ; do
    # subshell so the $MD_* variables don't carry between arrays
    (
        eval `mdadm --detail --export $array`
        [ -z "$MD_NAME" ] && exit 0     # v0.9 metadata has no name

        real_name=`echo "$MD_NAME" | cut -d: -f2`
        # if there's no host field (no colon), use the full name
        [ -z "$real_name" ] && real_name="$MD_NAME"

        cp -a $array "/dev/md/$real_name"
        cp -a $array "/dev/md_$real_name"

        # might or might not be needed; my setup works without:
        rm $array
    )
done

I have not tested this on a metadata=0.9 array, but as long as those
don't provide an MD_NAME in --detail --export, it should work fine.
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