[PATCH] md: a couple of tidyups relating to the bitmap file.

1/ When init from disk, it is a BUG if there is nowhere
   to init from,
2/ use seq_path to print path in /proc/mdstat

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/bitmap.c

@@ -769,13 +769,7 @@ static int bitmap_init_from_disk(struct bitmap *bitmap)
 	chunks = bitmap->chunks;
 	file = bitmap->file;
 
-	if (!file) { /* no file, dirty all the in-memory bits */
-		printk(KERN_INFO "%s: no bitmap file, doing full recovery\n",
-			bmname(bitmap));
-		bitmap_set_memory_bits(bitmap, 0,
-				       chunks << CHUNK_BLOCK_SHIFT(bitmap), 1);
-		return 0;
-	}
+	BUG_ON(!file);
 
 #if INJECT_FAULTS_3
 	outofdate = 1;