Remove 'major' from superswitch.

It isn't generally meaningful.

Assemble.c

@@ -542,8 +542,8 @@ int Assemble(struct supertype *st, char *mddev, int mdfd,
 			    == devices[devcnt].i.events
 			    && (devices[best[i]].i.disk.minor
 				!= devices[devcnt].i.disk.minor)
-			    && st->ss->major == 0
-			    && info.array.level != -4) {
+			    && st->ss == &super0
+			    && info.array.level != LEVEL_MULTIPATH) {
 				/* two different devices with identical superblock.
 				 * Could be a mis-detection caused by overlapping
 				 * partitions.  fail-safe.
@@ -866,8 +866,8 @@ int Assemble(struct supertype *st, char *mddev, int mdfd,
 		if ((vers % 100) >= 1) { /* can use different versions */
 			mdu_array_info_t inf;
 			memset(&inf, 0, sizeof(inf));
-			inf.major_version = st->ss->major;
-			inf.minor_version = st->minor_version;
+			inf.major_version = info.array.major_version;
+			inf.minor_version = info.array.minor_version;
 			rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
 		} else
 			rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);

Create.c

@@ -76,6 +76,7 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 	unsigned long long bitmapsize;
 	struct mdinfo *sra;
 	struct mdinfo info;
+	int did_default = 0;
 
 	int major_num = BITMAP_MAJOR_HI;
 
@@ -289,12 +290,9 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 					dname);
 				exit(2);
 			}
-			if (st->ss->major != 0 ||
+			if (st->ss != &super0 ||
 			    st->minor_version != 90)
-				fprintf(stderr, Name ": Defaulting to version"
-					" %d.%d metadata\n",
-					st->ss->major,
-					st->minor_version);
+				did_default = 1;
 		} else {
 			if (!st->ss->validate_geometry(st, level, layout,
 						       raiddisks,
@@ -356,9 +354,12 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 		}
 		if (level > 0 || level == LEVEL_MULTIPATH
 		    || level == LEVEL_FAULTY
-		    || (st && st->ss->external) ) {
+		    || st->ss->external ) {
 			/* size is meaningful */
-			if (minsize > 0x100000000ULL && st->ss->major == 0) {
+			if (!st->ss->validate_geometry(st, level, layout,
+						       raiddisks,
+						       chunk, minsize,
+						       NULL, NULL)) {
 				fprintf(stderr, Name ": devices too large for RAID level %d\n", level);
 				return 1;
 			}
@@ -485,7 +486,7 @@ 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 = st->ss->major;
+	info.array.major_version = 0; /* Flag to say "not zeroing superblock" */
 
 	if (name == NULL || *name == 0) {
 		/* base name on mddev */
@@ -516,6 +517,10 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 
 	st->ss->getinfo_super(st, &info);
 
+	if (did_default)
+		fprintf(stderr, Name ": Defaulting to version"
+			" %s metadata\n", info.text_version);
+
 	if (bitmap_file && vers < 9003) {
 		major_num = BITMAP_MAJOR_HOSTENDIAN;
 #ifdef __BIG_ENDIAN
@@ -586,8 +591,8 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 	} else	if ((vers % 100) >= 1) { /* can use different versions */
 		mdu_array_info_t inf;
 		memset(&inf, 0, sizeof(inf));
-		inf.major_version = st->ss->major;
-		inf.minor_version = st->minor_version;
+		inf.major_version = info.array.major_version;
+		inf.minor_version = info.array.minor_version;
 		rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
 	} else
 		rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);

Incremental.c

@@ -300,12 +300,11 @@ int Incremental(char *devname, int verbose, int runstop,
 	/* - add the device */
 		mdu_array_info_t ainf;
 		mdu_disk_info_t disk;
-		char md[20];
 		struct mdinfo *sra;
 
 		memset(&ainf, 0, sizeof(ainf));
-		ainf.major_version = st->ss->major;
-		ainf.minor_version = st->minor_version;
+		ainf.major_version = info.array.major_version;
+		ainf.minor_version = info.array.minor_version;
 		if (ioctl(mdfd, SET_ARRAY_INFO, &ainf) != 0) {
 			fprintf(stderr, Name
 				": SET_ARRAY_INFO failed for %s: %s\b",
@@ -313,9 +312,8 @@ int Incremental(char *devname, int verbose, int runstop,
 			close(mdfd);
 			return 2;
 		}
-		sprintf(md, "%d.%d\n", st->ss->major, st->minor_version);
 		sra = sysfs_read(mdfd, devnum, GET_VERSION);
-		sysfs_set_str(sra, NULL, "metadata_version", md);
+		sysfs_set_str(sra, NULL, "metadata_version", info.text_version);
 		memset(&disk, 0, sizeof(disk));
 		disk.major = major(stb.st_rdev);
 		disk.minor = minor(stb.st_rdev);
@@ -352,29 +350,18 @@ int Incremental(char *devname, int verbose, int runstop,
 		int err;
 		struct mdinfo *sra;
 		struct supertype *st2;
-		sra = sysfs_read(mdfd, devnum, (GET_VERSION | GET_DEVS |
-						GET_STATE));
+		sra = sysfs_read(mdfd, devnum, (GET_DEVS | GET_STATE));
 
-		if (sra->array.major_version != st->ss->major ||
-		    sra->array.minor_version != st->minor_version) {
-			if (verbose >= 0)
-				fprintf(stderr, Name
-	      ": %s has different metadata to chosen array %s %d.%d %d.%d.\n",
-					devname, chosen_name,
-					sra->array.major_version,
-					sra->array.minor_version,
-					st->ss->major, st->minor_version);
-			close(mdfd);
-			return 1;
-		}
 		sprintf(dn, "%d:%d", sra->devs->disk.major,
 			sra->devs->disk.minor);
 		dfd2 = dev_open(dn, O_RDONLY);
 		st2 = dup_super(st);
-		if (st2->ss->load_super(st2, dfd2, NULL)) {
+		if (st2->ss->load_super(st2, dfd2, NULL) ||
+		    st->ss->compare_super(st, st2) != 0) {
 			fprintf(stderr, Name
-				": Strange error loading metadata for %s.\n",
-				chosen_name);
+				": metadata mismatch between %s and "
+				"chosen array %s\n",
+				devname, chosen_name);
 			close(mdfd);
 			close(dfd2);
 			return 2;

Query.c

@@ -96,7 +96,7 @@ int Query(char *dev)
 	if (superror == 0) {
 		/* array might be active... */
 		st->ss->getinfo_super(st, &info);
-		if (st->ss->major == 0) {
+		if (st->ss == &super0) {
 			mddev = get_md_name(info.array.md_minor);
 			disc.number = info.disk.number;
 			activity = "undetected";
@@ -121,7 +121,7 @@ int Query(char *dev)
 		       activity,
 		       map_num(pers, info.array.level),
 		       mddev);
-		if (st->ss->major == 0)
+		if (st->ss == &super0)
 			put_md_name(mddev);
 	}
 	return 0;

mdadm.h

@@ -448,7 +448,6 @@ extern struct superswitch {
 	struct mdinfo *(*activate_spare)(struct active_array *a,
 					 struct metadata_update **updates);
 
-	int major;
 	int swapuuid; /* true if uuid is bigending rather than hostendian */
 	int external;
 } super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];

super-ddf.c

@@ -3119,7 +3119,6 @@ struct superswitch super_ddf = {
 	.match_metadata_desc = match_metadata_desc_ddf,
 	.getinfo_super_n  = getinfo_super_n_container,
 
-	.major		= 1000,
 	.swapuuid	= 0,
 	.external	= 1,
 
@@ -3152,7 +3151,6 @@ struct superswitch super_ddf_container = {
 	.container_content = container_content_ddf,
 	.getinfo_super_n  = getinfo_super_n_container,
 
-	.major		= 1000,
 	.swapuuid	= 0,
 	.external	= 1,
 };
@@ -3174,7 +3172,6 @@ struct superswitch super_ddf_bvd = {
 	.free_super	= free_super_ddf,
 	.match_metadata_desc = match_metadata_desc_ddf_bvd,
 
-	.major		= 1001,
 	.swapuuid	= 0,
 	.external	= 2,
 };
@@ -3192,7 +3189,6 @@ struct superswitch super_ddf_svd = {
 	.free_super	= free_super_ddf,
 	.match_metadata_desc = match_metadata_desc_ddf_svd,
 
-	.major		= 1002,
 	.swapuuid	= 0,
 	.external	= 2,
 };

super-intel.c

@@ -1873,7 +1873,6 @@ struct superswitch super_imsm = {
 	.getinfo_super_n  = getinfo_super_n_imsm_container,
 
 	.validate_geometry = validate_geometry_imsm,
-	.major		= 2000,
 	.swapuuid	= 0,
 	.external	= 1,
 
@@ -1909,7 +1908,6 @@ struct superswitch super_imsm_container = {
 
 	.container_content = container_content_imsm,
 
-	.major		= 2000,
 	.swapuuid	= 0,
 	.external	= 1,
 };
@@ -1928,7 +1926,6 @@ struct superswitch super_imsm_volume = {
 
 
 	.validate_geometry = validate_geometry_imsm_volume,
-	.major		= 2001,
 	.swapuuid	= 0,
 	.external	= 2,
 };

super0.c

@@ -1089,6 +1089,5 @@ struct superswitch super0 = {
 	.write_bitmap = write_bitmap0,
 	.free_super = free_super0,
 	.validate_geometry = validate_geometry0,
-	.major = 0,
 	.swapuuid = 0,
 };

super1.c

@@ -493,7 +493,7 @@ static void getinfo_super1(struct supertype *st, struct mdinfo *info)
 	int role;
 
 	info->array.major_version = 1;
-	info->array.minor_version = __le32_to_cpu(sb->feature_map);
+	info->array.minor_version = st->minor_version;
 	info->array.patch_version = 0;
 	info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
 	info->array.level = __le32_to_cpu(sb->level);
@@ -1502,7 +1502,6 @@ struct superswitch super1 = {
 	.write_bitmap = write_bitmap1,
 	.free_super = free_super1,
 	.validate_geometry = validate_geometry1,
-	.major = 1,
 #if __BYTE_ORDER == BIG_ENDIAN
 	.swapuuid = 0,
 #else

sysfs.c

@@ -134,10 +134,12 @@ struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
 			sra->array.major_version = -1;
 			sra->array.minor_version = -2;
 			strcpy(sra->text_version, buf+9);
-		} else
+		} else {
 			sscanf(buf, "%d.%d",
 			       &sra->array.major_version,
 			       &sra->array.minor_version);
+			strcpy(sra->text_version, buf);
+		}
 	}
 	if (options & GET_LEVEL) {
 		strcpy(base, "level");