Remove silly convention that major='-1' means 'zero superblock'.

Use 'info pointer is NULL' instead.

Create.c

@@ -487,7 +487,6 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 		+ info.array.failed_disks;
 	info.array.layout = layout;
 	info.array.chunk_size = chunk*1024;
-	info.array.major_version = 0; /* Flag to say "not zeroing superblock" */
 
 	if (name == NULL || *name == 0) {
 		/* base name on mddev */

Kill.c

@@ -63,10 +63,8 @@ int Kill(char *dev, int force, int quiet, int noexcl)
 	if (force && rv >= 2)
 		rv = 0; /* ignore bad data in superblock */
 	if (rv== 0 || (force && rv >= 2)) {
-		mdu_array_info_t info;
-		info.major_version = -1; /* zero superblock */
 		st->ss->free_super(st);
-		st->ss->init_super(st, &info, 0, "", NULL, NULL);
+		st->ss->init_super(st, NULL, 0, "", NULL, NULL);
 		if (st->ss->store_super(st, fd)) {
 			if (!quiet)
 				fprintf(stderr, Name ": Could not zero superblock on %s\n",

super-ddf.c

@@ -1455,6 +1455,11 @@ static int init_super_ddf(struct supertype *st,
 	struct phys_disk *pd;
 	struct virtual_disk *vd;
 
+	if (!info) {
+		st->sb = NULL;
+		return 0;
+	}
+
 	ddf = malloc(sizeof(*ddf));
 	memset(ddf, 0, sizeof(*ddf));
 	ddf->dlist = NULL; /* no physical disks yet */
@@ -2558,15 +2563,6 @@ static struct mdinfo *container_content_ddf(struct supertype *st)
 	return rest;
 }
 
-static int init_zero_ddf(struct supertype *st,
-			 mdu_array_info_t *info,
-			 unsigned long long size, char *name,
-			 char *homehost, int *uuid)
-{
-	st->sb = NULL;
-	return 0;
-}
-
 static int store_zero_ddf(struct supertype *st, int fd)
 {
 	unsigned long long dsize;
@@ -3115,7 +3111,7 @@ struct superswitch super_ddf = {
 	.compare_super	= compare_super_ddf,
 
 	.load_super	= load_super_ddf,
-	.init_super	= init_zero_ddf,
+	.init_super	= init_super_ddf,
 	.store_super	= store_zero_ddf,
 	.free_super	= free_super_ddf,
 	.match_metadata_desc = match_metadata_desc_ddf,

super0.c

@@ -559,7 +559,7 @@ static int init_super0(struct supertype *st, mdu_array_info_t *info,
 	memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 
 	st->sb = sb;
-	if (info->major_version == -1) {
+	if (info == NULL) {
 		/* zeroing the superblock */
 		return 0;
 	}

super1.c

@@ -697,7 +697,7 @@ static int init_super1(struct supertype *st, mdu_array_info_t *info,
 	memset(sb, 0, 1024);
 
 	st->sb = sb;
-	if (info->major_version == -1) {
+	if (info == NULL) {
 		/* zeroing superblock */
 		return 0;
 	}