[linux-lvm] automatically filter disks with imsm or ddf superblocks

[Miquel van Smoorenburg]

An earlier version of this patch was sent to the debian bugsystem (bug 
684712). I am now submitting this as an RFC to the upstream maintainers.

The linux md raid subsystem supports more than just MD formatted 
superblocks - it also works with DDF and IMSM (Intel Matrix RAID) 
superblocks.

Because of that I added reckognition of those types of superblocks to 
lvm, similar to what is already being done for md.

Note that dev-ddf.c and dev-imsm.c have "Copyright: Miquel van 
Smoorenburg" headers.. it looks like lvm only has redhat copyrighted 
stuff in it. Feel free to remove my copyright there, and/or add redhat 
copyright. The contents of those files aren't really original anyway, 
mostly copied from dev-md.c.

Questions:
- mdadm calls this format "imsm", should we keep that name or use
   "matrix", or perhaps "(Intel) RST" since Intel renamed "matrix
   raid" to "Rapid Storage Technology" last year.
- right now the md_component_detection configuration option also
   turns on/off ddf and imsm detection. I think that is fine as in
   linux it is the "md" driver that supports those formats. Or should
   this option be renamed, or perhaps different options for each
   superblock type (not my preference).

Thanks

Mike.
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