[PATCH] add support for dmraid devices

[Felix Zielcke]

Here's a patch which let grub-probe work with /dev/mapper/nvidia_ dmraid
devices. The other ones that dmraid supports are for now just not
anymore treated as LVM but hostdisk.c doestn't yet support them.

The find_partition_by_uuid is needed, because on my dmraid the
HDIO_GETGEO ioctl returns just zeros for all fields. So there is no way
to get the start of the partition which the normal find_partition needs.
Currently it uses the output of blkid to get the UUID of the device and
then compares it with all grub devices like search --fs-uuid does.

BSD partitions aren't currently supported, but Vladimir wants to change
them so they're numbers instead of letters which would make it easier
for me.
-- 
Felix Zielcke

dmraid.patch
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