Exporting which partitions to md-configure

["H. Peter Anvin" <hpa@zytor.com>]

I'm putting the final touches on kinit, which is the user-space 
replacement (based on klibc) for the whole in-kernel root-mount complex. 
  Pretty much the one thing remaining -- other than lots of testing -- 
is to handle automatically mounted md devices.  In order to do that, 
without adding userspace versions of all the paritition code (which may 
be a future change, but a pretty big one) it would be good if the 
partition flag to auto-configure RAID was available in userspace, 
presumably through sysfs.

Any feeling how best to do that?  My current thinking is to export a 
"flags" entry in addition to the current ones, presumably based on 
"struct parsed_partitions->parts[].flags" (fs/partitions/check.h), which 
seems to be what causes md_autodetect_dev() to be called.

Note that this should be available even if md isn't compiled into the 
kernel, thus making it possible to load md as a module before running 
kinit, or to make the equivalent of the kernel mounting sequence from a 
totally runtime user tool.

	-hpa
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