super1

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Fix raid5 creation with new code.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>

1 files changed, 720 insertions, 0 deletions

diff --git a/super1.c b/super1.c
new file mode 100644
index 0000000..8678765
--- /dev/null
+++ b/super1.c
@@ -0,0 +1,720 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
+ *
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *    Author: Neil Brown
+ *    Email: <neilb@cse.unsw.edu.au>
+ *    Paper: Neil Brown
+ *           School of Computer Science and Engineering
+ *           The University of New South Wales
+ *           Sydney, 2052
+ *           Australia
+ */
+
+#include "mdadm.h"
+
+#include "asm/byteorder.h"
+/*
+ * The version-1 superblock :
+ * All numeric fields are little-endian.
+ *
+ * total size: 256 bytes plus 2 per device.
+ *  1K allows 384 devices.
+ */
+struct mdp_superblock_1 {
+	/* constant array information - 128 bytes */
+	__u32	magic;		/* MD_SB_MAGIC: 0xa92b4efc - little endian */
+	__u32	major_version;	/* 1 */
+	__u32	feature_map;	/* 0 for now */
+	__u32	pad0;		/* always set to 0 when writing */
+
+	__u8	set_uuid[16];	/* user-space generated. */
+	char	set_name[32];	/* set and interpreted by user-space */
+
+	__u64	ctime;		/* lo 40 bits are seconds, top 24 are microseconds or 0*/
+	__u32	level;		/* -4 (multipath), -1 (linear), 0,1,4,5 */
+	__u32	layout;		/* only for raid5 currently */
+	__u64	size;		/* used size of component devices, in 512byte sectors */
+
+	__u32	chunksize;	/* in 512byte sectors */
+	__u32	raid_disks;
+	__u8	pad1[128-96];	/* set to 0 when written */
+
+	/* constant this-device information - 64 bytes */
+	__u64	data_offset;	/* sector start of data, often 0 */
+	__u64	data_size;	/* sectors in this device that can be used for data */
+	__u64	super_offset;	/* sector start of this superblock */
+	__u64	recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
+	__u32	dev_number;	/* permanent identifier of this  device - not role in raid */
+	__u32	cnt_corrected_read; /* number of read errors that were corrected by re-writing */
+	__u8	device_uuid[16]; /* user-space setable, ignored by kernel */
+	__u8	pad2[64-56];	/* set to 0 when writing */
+
+	/* array state information - 64 bytes */
+	__u64	utime;		/* 40 bits second, 24 btes microseconds */
+	__u64	events;		/* incremented when superblock updated */
+	__u64	resync_offset;	/* data before this offset (from data_offset) known to be in sync */
+	__u32	sb_csum;	/* checksum upto devs[max_dev] */
+	__u32	max_dev;	/* size of devs[] array to consider */
+	__u8	pad3[64-32];	/* set to 0 when writing */
+
+	/* device state information. Indexed by dev_number.
+	 * 2 bytes per device
+	 * Note there are no per-device state flags. State information is rolled
+	 * into the 'roles' value.  If a device is spare or faulty, then it doesn't
+	 * have a meaningful role.
+	 */
+	__u16	dev_roles[0];	/* role in array, or 0xffff for a spare, or 0xfffe for faulty */
+};
+
+#define offsetof(t,f) ((int)&(((t*)0)->f))
+static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
+{
+	unsigned int disk_csum, csum;
+	unsigned long long newcsum;
+	int size = sizeof(*sb) + __le32_to_cpu(sb->max_dev)*2;
+	unsigned int *isuper = (unsigned int*)sb;
+	int i;
+
+/* make sure I can count... */
+	if (offsetof(struct mdp_superblock_1,data_offset) != 128 ||
+	    offsetof(struct mdp_superblock_1, utime) != 192 ||
+	    sizeof(struct mdp_superblock_1) != 256) {
+		fprintf(stderr, "WARNING - superblock isn't sized correctly\n");
+	}
+
+	disk_csum = sb->sb_csum;
+	sb->sb_csum = 0;
+	newcsum = 0;
+	for (i=0; size>=4; size -= 4 )
+		newcsum += __le32_to_cpu(*isuper++);
+
+	if (size == 2)
+		newcsum += __le16_to_cpu(*(unsigned short*) isuper);
+
+	csum = (newcsum & 0xffffffff) + (newcsum >> 32);
+	sb->sb_csum = disk_csum;
+	return csum;
+}
+
+
+static void examine_super1(void *sbv)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	time_t atime;
+	int d;
+	int spares, faulty;
+	int i;
+	char *c;
+
+	printf("          Magic : %08x\n", __le32_to_cpu(sb->magic));
+	printf("        Version : %02d.%02d\n", 1, __le32_to_cpu(sb->feature_map));
+	printf("     Array UUID : ");
+	for (i=0; i<16; i++) {
+		printf("%02x", sb->set_uuid[i]);
+		if ((i&3)==0 && i != 0) printf(":");
+	}
+	printf("\n");
+	printf("           Name : %.32s\n", sb->set_name);
+
+	atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
+	printf("  Creation Time : %.24s\n", ctime(&atime));
+	c=map_num(pers, __le32_to_cpu(sb->level));
+	printf("     Raid Level : %s\n", c?c:"-unknown-");
+	printf("   Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks));
+	printf("\n");
+	printf("    Device Size : %llu%s\n", sb->data_size, human_size(sb->data_size<<9));
+	if (sb->data_offset)
+		printf("    Data Offset : %llu sectors\n", __le64_to_cpu(sb->data_offset));
+	if (sb->super_offset)
+		printf("   Super Offset : %llu sectors\n", __le64_to_cpu(sb->super_offset));
+	printf("    Device UUID : ");
+	for (i=0; i<16; i++) {
+		printf("%02x", sb->set_uuid[i]);
+		if ((i&3)==0 && i != 0) printf(":");
+	}
+	printf("\n");
+
+	atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
+	printf("    Update Time : %.24s\n", ctime(&atime));
+
+	if (calc_sb_1_csum(sb) == sb->sb_csum)
+		printf("       Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
+	else
+		printf("       Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
+		       __le32_to_cpu(calc_sb_1_csum(sb)));
+	printf("         Events : %llu\n", __le64_to_cpu(sb->events));
+	printf("\n");
+	if (__le32_to_cpu(sb->level) == 5) {
+		c = map_num(r5layout, __le32_to_cpu(sb->layout));
+		printf("         Layout : %s\n", c?c:"-unknown-");
+	}
+	switch(__le32_to_cpu(sb->level)) {
+	case 0:
+	case 4:
+	case 5:
+		printf("     Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize/2));
+		break;
+	case -1:
+		printf("       Rounding : %dK\n", __le32_to_cpu(sb->chunksize/2));
+		break;
+	default: break;
+	}
+	printf("\n");
+	printf("   Array State : ");
+	for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
+		int cnt = 0;
+		int me = 0;
+		int i;
+		for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
+			int role = __le16_to_cpu(sb->dev_roles[i]);
+			if (role == d) {
+				if (i == __le32_to_cpu(sb->dev_number))
+					me = 1;
+				cnt++;
+			}
+		}
+		if (cnt > 1) printf("?");
+		else if (cnt == 1 && me) printf("U");
+		else if (cnt == 1) printf("u");
+		else printf ("_");
+	}
+	spares = faulty = 0;
+	for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
+		int role = __le16_to_cpu(sb->dev_roles[i]);
+		switch (role) {
+		case 0xFFFF: spares++; break;
+		case 0xFFFE: faulty++;
+		}
+	}
+	if (spares) printf(" %d spares", spares);
+	if (faulty) printf(" %d failed", faulty);
+	printf("\n");
+}
+
+
+static void brief_examine_super1(void *sbv)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	int i;
+
+	char *c=map_num(pers, __le32_to_cpu(sb->level));
+
+	printf("ARRAY /dev/?? level=%s metadata=1 num-devices=%d UUID=",
+	       c?c:"-unknown-", sb->raid_disks);
+	for (i=0; i<16; i++) {
+		printf("%02x", sb->set_uuid[i]);
+		if ((i&3)==0 && i != 0) printf(":");
+	}
+	printf("\n");
+}
+
+static void detail_super1(void *sbv)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	int i;
+
+	printf("           UUID : ");
+	for (i=0; i<16; i++) {
+		printf("%02x", sb->set_uuid[i]);
+		if ((i&3)==0 && i != 0) printf(":");
+	}
+	printf("\n         Events : %llu\n\n", __le64_to_cpu(sb->events));
+}
+
+static void brief_detail_super1(void *sbv)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	int i;
+
+	printf(" UUID=");
+	for (i=0; i<16; i++) {
+		printf("%02x", sb->set_uuid[i]);
+		if ((i&3)==0 && i != 0) printf(":");
+	}
+}
+
+static void uuid_from_super1(int uuid[4], void * sbv)
+{
+	struct mdp_superblock_1 *super = sbv;
+	char *cuuid = (char*)uuid;
+	int i;
+	for (i=0; i<16; i++)
+		cuuid[i] = super->set_uuid[i];
+}
+
+static void getinfo_super1(struct mdinfo *info, void *sbv)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	int working = 0;
+	int i;
+	int role;
+
+	info->array.major_version = 1;
+	info->array.minor_version = __le32_to_cpu(sb->feature_map);
+	info->array.patch_version = 0;
+	info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
+	info->array.level = __le32_to_cpu(sb->level);
+	info->array.md_minor = -1;
+	info->array.ctime = __le64_to_cpu(sb->ctime);
+
+	info->disk.major = 0;
+	info->disk.minor = 0;
+
+	if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
+	    __le32_to_cpu(sb->max_dev) > 512)
+		role = 0xfffe;
+	else
+		role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
+
+	info->disk.raid_disk = -1;
+	switch(role) {
+	case 0xFFFF:
+		info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
+		break;
+	case 0xFFFE:
+		info->disk.state = 1; /* faulty */
+		break;
+	default:
+		info->disk.state = 6; /* active and in sync */
+		info->disk.raid_disk = role;
+	}
+	info->events = __le64_to_cpu(sb->events);
+
+	memcpy(info->uuid, sb->set_uuid, 16);
+
+	for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
+		role = __le16_to_cpu(sb->dev_roles[i]);
+		if (role == 0xFFFF || role < info->array.raid_disks)
+			working++;
+	}
+
+	info->array.working_disks = working;
+}
+
+static int update_super1(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
+{
+	int rv = 0;
+	struct mdp_superblock_1 *sb = sbv;
+
+	if (strcmp(update, "force")==0) {
+		sb->events = __cpu_to_le32(info->events);
+		switch(__le32_to_cpu(sb->level)) {
+		case 5: case 4: case 6:
+			/* need to force clean */
+			sb->resync_offset = ~0ULL;
+		}
+	}
+	if (strcmp(update, "assemble")==0) {
+		int d = info->disk.number;
+		int want;
+		if (info->disk.state == 6)
+			want = __cpu_to_le32(info->disk.raid_disk);
+		else
+			want = 0xFFFF;
+		if (sb->dev_roles[d] != want) {
+			sb->dev_roles[d] = want;
+			rv = 1;
+		}
+	}
+#if 0
+	if (strcmp(update, "newdev") == 0) {
+		int d = info->disk.number;
+		memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
+		sb->disks[d].number = d;
+		sb->disks[d].major = info->disk.major;
+		sb->disks[d].minor = info->disk.minor;
+		sb->disks[d].raid_disk = info->disk.raid_disk;
+		sb->disks[d].state = info->disk.state;
+		sb->this_disk = sb->disks[d];
+	}
+#endif
+	if (strcmp(update, "grow") == 0) {
+		sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
+		/* FIXME */
+	}
+	if (strcmp(update, "resync") == 0) {
+		/* make sure resync happens */
+		sb->resync_offset = ~0ULL;
+	}
+
+	sb->sb_csum = calc_sb_1_csum(sb);
+	return rv;
+}
+
+
+static __u64 event_super1(void *sbv)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	return __le64_to_cpu(sb->events);
+}
+
+static int init_super1(void **sbp, mdu_array_info_t *info)
+{
+	struct mdp_superblock_1 *sb = malloc(1024);
+	int spares;
+	memset(sb, 0, 1024);
+
+	if (info->major_version == -1)
+		/* zeroing superblock */
+		return 0;
+
+	spares = info->working_disks - info->active_disks;
+	if (info->raid_disks + spares  > 384) {
+		fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
+			info->raid_disks , spares, 384);
+		return 0;
+	}
+
+
+	sb->magic = __cpu_to_le32(MD_SB_MAGIC);
+	sb->major_version = __cpu_to_le32(1);
+	sb->feature_map = 0;
+	sb->pad0 = 0;
+	*(__u32*)(sb->set_uuid) = random();
+	*(__u32*)(sb->set_uuid+4) = random();
+	*(__u32*)(sb->set_uuid+8) = random();
+	*(__u32*)(sb->set_uuid+12) = random();
+
+	/* FIXME name */
+
+	sb->ctime = __cpu_to_le64((unsigned long long)time(0));
+	sb->level = __cpu_to_le32(info->level);
+	sb->layout = __cpu_to_le32(info->level);
+	sb->size = __cpu_to_le64(info->size*2ULL);
+	sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
+	sb->raid_disks = __cpu_to_le32(info->raid_disks);
+
+	sb->data_offset = __cpu_to_le64(0);
+	sb->data_size = __cpu_to_le64(0);
+	sb->super_offset = __cpu_to_le64(0);
+	sb->recovery_offset = __cpu_to_le64(0);
+
+	sb->utime = sb->ctime;
+	sb->events = __cpu_to_le64(1);
+	if (info->state & MD_SB_CLEAN)
+		sb->resync_offset = ~0ULL;
+	else
+		sb->resync_offset = 0;
+	sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/ 
+				    sizeof(sb->dev_roles[0]));
+	memset(sb->pad3, 0, sizeof(sb->pad3));
+
+	memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
+
+	*sbp = sb;
+	return 1;
+}
+
+/* Add a device to the superblock being created */
+static void add_to_super1(void *sbv, mdu_disk_info_t *dk)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	__u16 *rp = sb->dev_roles + dk->number;
+	if (dk->state == 6) /* active, sync */
+		*rp = __cpu_to_le16(dk->raid_disk);
+	else if (dk->state == 2) /* active -> spare */
+		*rp = 0xffff;
+	else 
+		*rp = 0xfffe;
+}
+
+static int store_super1(int fd, void *sbv)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	long long sb_offset;
+	int sbsize;
+
+    
+	sb_offset = __le64_to_cpu(sb->super_offset) << 9;
+
+	if (lseek64(fd, sb_offset, 0)< 0LL)
+		return 3;
+
+	sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
+
+	if (write(fd, sb, sbsize) != sbsize)
+		return 4;
+
+	return 0;
+}
+
+static int write_init_super1(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname)
+{
+	struct mdp_superblock_1 *sb = sbv;
+	int fd = open(devname, O_RDWR, O_EXCL);
+	int rv;
+
+	long size;
+	long long sb_offset;
+
+
+	if (fd < 0) {
+		fprintf(stderr, Name ": Failed to open %s to write superblock\n",
+			devname);
+		return -1;
+	}
+
+	sb->dev_number = __cpu_to_le32(dinfo->number);
+	*(__u32*)(sb->device_uuid) = random();
+	*(__u32*)(sb->device_uuid+4) = random();
+	*(__u32*)(sb->device_uuid+8) = random();
+	*(__u32*)(sb->device_uuid+12) = random();
+
+    
+	if (ioctl(fd, BLKGETSIZE, &size))
+		return 1;
+
+	if (size < 24)
+		return 2;
+
+
+	/*
+	 * Calculate the position of the superblock.
+	 * It is always aligned to a 4K boundary and
+	 * depending on minor_version, it can be:
+	 * 0: At least 8K, but less than 12K, from end of device
+	 * 1: At start of device
+	 * 2: 4K from start of device.
+	 */
+	switch(st->minor_version) {
+	case 0:
+		sb_offset = size;
+		sb_offset -= 8*2;
+		sb_offset &= ~(4*2-1);
+		sb->super_offset = __cpu_to_le64(sb_offset);
+		sb->data_offset = __cpu_to_le64(0);
+		sb->data_size = sb->super_offset;
+		break;
+	case 1:
+		sb->super_offset = __cpu_to_le64(0);
+		sb->data_offset = __cpu_to_le64(2);
+		sb->data_size = __cpu_to_le64(size - 2);
+		break;
+	case 2:
+		sb_offset = 4*2;
+		sb->super_offset = __cpu_to_le64(sb_offset);
+		sb->data_offset = __cpu_to_le64(sb_offset+2);
+		sb->data_size = __cpu_to_le64(size - 4*2 - 2);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+
+	sb->sb_csum = calc_sb_1_csum(sb);
+	rv = store_super1(fd, sb);
+	if (rv)
+		fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
+	return rv;
+}
+
+static int compare_super1(void **firstp, void *secondv)
+{
+	/*
+	 * return:
+	 *  0 same, or first was empty, and second was copied
+	 *  1 second had wrong number
+	 *  2 wrong uuid
+	 *  3 wrong other info
+	 */
+	struct mdp_superblock_1 *first = *firstp;
+	struct mdp_superblock_1 *second = secondv;
+
+	if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
+		return 1;
+	if (second->major_version != __cpu_to_le32(1))
+		return 1;
+
+	if (!first) {
+		first = malloc(1024);
+		memcpy(first, second, 1024);
+		*firstp = first;
+		return 0;
+	}
+	if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
+		return 2;
+
+	if (first->ctime      != second->ctime     ||
+	    first->level      != second->level     ||
+	    first->layout     != second->layout    ||
+	    first->size       != second->size      ||
+	    first->chunksize  != second->chunksize ||
+	    first->raid_disks != second->raid_disks)
+		return 3;
+	return 0;
+}
+
+static int load_super1(struct supertype *st, int fd, void **sbp, char *devname)
+{
+	unsigned long size;
+	unsigned long long sb_offset;
+	struct mdp_superblock_1 *super;
+
+
+
+	if (st->ss == NULL) {
+		/* guess... */
+		st->ss = &super1;
+		for (st->minor_version = 0; st->minor_version <= 2 ; st->minor_version++) {
+			switch(load_super1(st, fd, sbp, devname)) {
+			case 0: return 0; /* good */
+			case 1: st->ss = NULL; return 1; /*bad device */
+			case 2: break; /* bad, try next */
+			}
+		}
+		st->ss = NULL;
+		return 2;
+	}
+	if (ioctl(fd, BLKGETSIZE, &size)) {
+		if (devname) 
+			fprintf(stderr, Name ": cannot find device size for %s: %s\n",
+				devname, strerror(errno));
+		return 1;
+	}
+
+	if (size < 24) {
+		if (devname)
+			fprintf(stderr, Name ": %s is too small for md: size is %lu sectors.\n",
+				devname, size);
+		return 1;
+	}
+
+	/*
+	 * Calculate the position of the superblock.
+	 * It is always aligned to a 4K boundary and
+	 * depeding on minor_version, it can be:
+	 * 0: At least 8K, but less than 12K, from end of device
+	 * 1: At start of device
+	 * 2: 4K from start of device.
+	 */
+	switch(st->minor_version) {
+	case 0:
+		sb_offset = size;
+		sb_offset -= 8*2;
+		sb_offset &= ~(4*2-1);
+		break;
+	case 1:
+		sb_offset = 0;
+		break;
+	case 2:
+		sb_offset = 4*2;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
+
+
+	if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
+		if (devname)
+			fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
+				devname, strerror(errno));
+		return 1;
+	}
+
+	super = malloc(1024);
+
+	if (read(fd, super, 1024) != 1024) {
+		if (devname)
+			fprintf(stderr, Name ": Cannot read superblock on %s\n",
+				devname);
+		free(super);
+		return 1;
+	}
+
+	if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
+		if (devname)
+			fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
+				devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
+		free(super);
+		return 2;
+	}
+
+	if (__le32_to_cpu(super->major_version) != 1) {
+		if (devname)
+			fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
+				devname, __le32_to_cpu(super->major_version));
+		free(super);
+		return 2;
+	}
+	if (__le64_to_cpu(super->super_offset) != sb_offset) {
+		if (devname)
+			fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
+				devname);
+		free(super);
+		return 2;
+	}
+	*sbp = super;
+	return 0;
+}
+
+
+static struct supertype *match_metadata_desc1(char *arg)
+{
+	struct supertype *st = malloc(sizeof(*st));
+	if (!st) return st;
+
+	st->ss = &super1;
+	if (strcmp(arg, "1") == 0 ||
+	    strcmp(arg, "1.0") == 0) {
+		st->minor_version = 0;
+		return st;
+	}
+	if (strcmp(arg, "1.1") == 0) {
+		st->minor_version = 1;
+		return st;
+	}
+	if (strcmp(arg, "1.2") == 0) {
+		st->minor_version = 2;
+		return st;
+	}
+
+	free(st);
+	return NULL;
+}
+
+static __u64 avail_size1(__u64 devsize)
+{
+	if (devsize < 24)
+		return 0;
+
+	return (devsize - 8*2 ) & ~(4*2-1);
+}
+
+struct superswitch super1 = {
+	.examine_super = examine_super1,
+	.brief_examine_super = brief_examine_super1,
+	.detail_super = detail_super1,
+	.brief_detail_super = brief_detail_super1,
+	.uuid_from_super = uuid_from_super1,
+	.getinfo_super = getinfo_super1,
+	.update_super = update_super1,
+	.event_super = event_super1,
+	.init_super = init_super1,
+	.add_to_super = add_to_super1,
+	.store_super = store_super1,
+	.write_init_super = write_init_super1,
+	.compare_super = compare_super1,
+	.load_super = load_super1,
+	.match_metadata_desc = match_metadata_desc1,
+	.avail_size = avail_size1,
+	.major = 1,
+};