[PATCH] md/bitmap: remove dead code from md/bitmap

bitmap_active is never called, and the BITMAP_ACTIVE flag is never users or
tested, so discard them both.

Also remove some out-of-date 'todo' comments.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/bitmap.c

@@ -14,9 +14,6 @@
  *
  * flush after percent set rather than just time based. (maybe both).
  * wait if count gets too high, wake when it drops to half.
- * allow bitmap to be mirrored with superblock (before or after...)
- * allow hot-add to re-instate a current device.
- * allow hot-add of bitmap after quiessing device
  */
 
 #include <linux/module.h>
@@ -70,23 +67,6 @@ static inline char * bmname(struct bitmap *bitmap)
 	return bitmap->mddev ? mdname(bitmap->mddev) : "mdX";
 }
 
-
-/*
- * test if the bitmap is active
- */
-int bitmap_active(struct bitmap *bitmap)
-{
-	unsigned long flags;
-	int res = 0;
-
-	if (!bitmap)
-		return res;
-	spin_lock_irqsave(&bitmap->lock, flags);
-	res = bitmap->flags & BITMAP_ACTIVE;
-	spin_unlock_irqrestore(&bitmap->lock, flags);
-	return res;
-}
-
 #define WRITE_POOL_SIZE 256
 
 /*
@@ -1496,8 +1476,6 @@ int bitmap_create(mddev_t *mddev)
 	if (!bitmap->bp)
 		goto error;
 
-	bitmap->flags |= BITMAP_ACTIVE;
-
 	/* now that we have some pages available, initialize the in-memory
 	 * bitmap from the on-disk bitmap */
 	start = 0;