[PATCH 0 of 5] MD: prepare RAID10 for inclusion in dm-raid.c

Neil,

Here's a couple patches that are necessary for MD before I can add
RAID10 to the list of supported personalities through dm-raid.c:
	1) md-raid10-rename-mirror_info.patch
	2) md-raid1-rename-mirror_info.patch
	3) md-move-IO_BLOCKED-to-md_h.patch
	4) md-export-md_raid10_congested.patch

I'll send the patch that enables raid10 as a separate patch that depends
on this patch set and a couple of DM patches.

 brassow