diff --git a/Create.c b/Create.c
index 717086b..1594a39 100644
--- a/Create.c
+++ b/Create.c
@@ -774,9 +774,9 @@ int Create(struct supertype *st, char *mddev,
 				st->ss->name);
 			goto abort_locked;
 		}
-		if (!st->ss->add_internal_bitmap(st, &s->bitmap_chunk,
-						 c->delay, s->write_behind,
-						 bitmapsize, 1, major_num)) {
+		if (st->ss->add_internal_bitmap(st, &s->bitmap_chunk,
+						c->delay, s->write_behind,
+						bitmapsize, 1, major_num)) {
 			pr_err("Given bitmap chunk size not supported.\n");
 			goto abort_locked;
 		}
diff --git a/Grow.c b/Grow.c
index 580c13e..cdd9d05 100755
--- a/Grow.c
+++ b/Grow.c
@@ -423,7 +423,7 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 				continue;
 			rv = st->ss->load_super(st, fd2, NULL);
 			if (!rv) {
-				if (st->ss->add_internal_bitmap(
+				if (!st->ss->add_internal_bitmap(
 					    st, &s->bitmap_chunk, c->delay,
 					    s->write_behind, bitmapsize,
 					    offset_setable, major))
diff --git a/mdadm.h b/mdadm.h
index d209488..b870585 100755
--- a/mdadm.h
+++ b/mdadm.h
@@ -896,6 +896,8 @@ extern struct superswitch {
 	 * created, in which case data_size may be updated, or it might
 	 * already exist.  Metadata handler can know if init_super
 	 * has been called, but not write_init_super.
+	 *  0:     Success
+	 * -Exxxx: On error
 	 */
 	int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 				   int delay, int write_behind,
diff --git a/super0.c b/super0.c
index 6fc1ac4..467a373 100644
--- a/super0.c
+++ b/super0.c
@@ -1139,7 +1139,7 @@ static int add_internal_bitmap0(struct supertype *st, int *chunkp,
 		if (chunk < 64*1024*1024)
 			chunk = 64*1024*1024;
 	} else if ((unsigned long long)chunk < min_chunk)
-		return 0; /* chunk size too small */
+		return -EINVAL; /* chunk size too small */
 
 	sb->state |= (1<<MD_SB_BITMAP_PRESENT);
 
@@ -1153,7 +1153,7 @@ static int add_internal_bitmap0(struct supertype *st, int *chunkp,
 	bms->sync_size = __cpu_to_le64(size);
 	bms->write_behind = __cpu_to_le32(write_behind);
 	*chunkp = chunk;
-	return 1;
+	return 0;
 }
 
 static int locate_bitmap0(struct supertype *st, int fd, int node_num)
diff --git a/super1.c b/super1.c
index fa93367..6bf9523 100644
--- a/super1.c
+++ b/super1.c
@@ -2270,7 +2270,7 @@ add_internal_bitmap1(struct supertype *st,
 		}
 		break;
 	default:
-		return 0;
+		return -ENOSPC;
 	}
 
 	room -= bbl_size;
@@ -2280,7 +2280,7 @@ add_internal_bitmap1(struct supertype *st,
 
 	if (room <= 1)
 		/* No room for a bitmap */
-		return 0;
+		return -ENOSPC;
 
 	max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
 
@@ -2298,9 +2298,9 @@ add_internal_bitmap1(struct supertype *st,
 		if (chunk < 64*1024*1024)
 			chunk = 64*1024*1024;
 	} else if (chunk < min_chunk)
-		return 0; /* chunk size too small */
+		return -EINVAL; /* chunk size too small */
 	if (chunk == 0) /* rounding problem */
-		return 0;
+		return -EINVAL;
 
 	if (offset == 0) {
 		/* start bitmap on a 4K boundary with enough space for
@@ -2336,7 +2336,7 @@ add_internal_bitmap1(struct supertype *st,
 	}
 
 	*chunkp = chunk;
-	return 1;
+	return 0;
 }
 
 static int locate_bitmap1(struct supertype *st, int fd, int node_num)