[PATCH] md: initial sysfs support for md

Start using kobjects in mddevs, and provide a couple of simple attributes
(level and disks).  Attributes live in
  /sys/block/mdX/md/attr-name

Signed-off-by: Neil Brown <neilb@suse.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/raid/md_k.h

@@ -148,6 +148,8 @@ struct mddev_s
 
 	struct gendisk			*gendisk;
 
+	struct kobject			kobj;
+
 	/* Superblock information */
 	int				major_version,
 					minor_version,