X-Git-Url: http://git.ipfire.org/?p=thirdparty%2Fmdadm.git;a=blobdiff_plain;f=super1.c;h=211be82356d0df94913da900693dfe55aa60881d;hp=62494a6e749c4f4634f5ed8764b1de96b2bfb7dc;hb=111d01fcc76d2e7d0b05f78fae67e89cdf6856ad;hpb=8fac0577f01646cb8a768c0830a884f74c63a18c

diff --git a/super1.c b/super1.c
index 62494a6e..211be823 100644
--- a/super1.c
+++ b/super1.c
@@ -1,7 +1,7 @@
 /*
  * mdadm - manage Linux "md" devices aka RAID arrays.
  *
- * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
+ * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
  *
  *
  *    This program is free software; you can redistribute it and/or modify
@@ -28,8 +28,6 @@
  */
 
 #include "mdadm.h"
-#include <endian.h>
-#include "asm/byteorder.h"
 /*
  * The version-1 superblock :
  * All numeric fields are little-endian.
@@ -60,8 +58,8 @@ struct mdp_superblock_1 {
 				 */
 
 	/* These are only valid with feature bit '4' */
-	__u64	reshape_position;	/* next address in array-space for reshape */
 	__u32	new_level;	/* new level we are reshaping to		*/
+	__u64	reshape_position;	/* next address in array-space for reshape */
 	__u32	delta_disks;	/* change in number of raid_disks		*/
 	__u32	new_layout;	/* new layout					*/
 	__u32	new_chunk;	/* new chunk size (bytes)			*/
@@ -96,6 +94,10 @@ struct mdp_superblock_1 {
 	__u16	dev_roles[0];	/* role in array, or 0xffff for a spare, or 0xfffe for faulty */
 };
 
+struct misc_dev_info {
+	__u64 device_size;
+};
+
 /* feature_map bits */
 #define MD_FEATURE_BITMAP_OFFSET	1
 #define	MD_FEATURE_RECOVERY_OFFSET	2 /* recovery_offset is present and
@@ -106,7 +108,7 @@ struct mdp_superblock_1 {
 #define	MD_FEATURE_ALL			(1|2|4)
 
 #ifndef offsetof
-#define offsetof(t,f) ((int)&(((t*)0)->f))
+#define offsetof(t,f) ((size_t)&(((t*)0)->f))
 #endif
 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
 {
@@ -126,29 +128,41 @@ static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
 	disk_csum = sb->sb_csum;
 	sb->sb_csum = 0;
 	newcsum = 0;
-	for (i=0; size>=4; size -= 4 )
-		newcsum += __le32_to_cpu(*isuper++);
+	for (i=0; size>=4; size -= 4 ) {
+		newcsum += __le32_to_cpu(*isuper);
+		isuper++;
+	}
 
 	if (size == 2)
 		newcsum += __le16_to_cpu(*(unsigned short*) isuper);
 
 	csum = (newcsum & 0xffffffff) + (newcsum >> 32);
 	sb->sb_csum = disk_csum;
-	return csum;
+	return __cpu_to_le32(csum);
 }
 
 #ifndef MDASSEMBLE
-static void examine_super1(void *sbv)
+static void examine_super1(struct supertype *st, char *homehost)
 {
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 	time_t atime;
 	int d;
 	int faulty;
 	int i;
 	char *c;
+	int l = homehost ? strlen(homehost) : 0;
+	int layout;
+	unsigned long long sb_offset;
 
 	printf("          Magic : %08x\n", __le32_to_cpu(sb->magic));
-	printf("        Version : %02d\n", 1);
+	printf("        Version : 1");
+	sb_offset = __le64_to_cpu(sb->super_offset);
+	if (sb_offset <= 4)
+		printf(".1\n");
+	else if (sb_offset <= 8)
+		printf(".2\n");
+	else
+		printf(".0\n");
 	printf("    Feature Map : 0x%x\n", __le32_to_cpu(sb->feature_map));
 	printf("     Array UUID : ");
 	for (i=0; i<16; i++) {
@@ -156,33 +170,47 @@ static void examine_super1(void *sbv)
 		printf("%02x", sb->set_uuid[i]);
 	}
 	printf("\n");
-	printf("           Name : %.32s\n", sb->set_name);
-
+	printf("           Name : %.32s", sb->set_name);
+	if (l > 0 && l < 32 &&
+	    sb->set_name[l] == ':' &&
+	    strncmp(sb->set_name, homehost, l) == 0)
+		printf("  (local to host %s)", homehost);
+	printf("\n");
 	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", (unsigned long long)sb->data_size, human_size(sb->data_size<<9));
+	printf(" Avail Dev Size : %llu%s\n",
+	       (unsigned long long)__le64_to_cpu(sb->data_size),
+	       human_size(__le64_to_cpu(sb->data_size)<<9));
 	if (__le32_to_cpu(sb->level) >= 0) {
 		int ddsks=0;
 		switch(__le32_to_cpu(sb->level)) {
 		case 1: ddsks=1;break;
 		case 4:
-		case 5: ddsks = sb->raid_disks-1; break;
-		case 6: ddsks = sb->raid_disks-2; break;
-		case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
+		case 5: ddsks = __le32_to_cpu(sb->raid_disks)-1; break;
+		case 6: ddsks = __le32_to_cpu(sb->raid_disks)-2; break;
+		case 10:
+			layout = __le32_to_cpu(sb->layout);
+			ddsks = __le32_to_cpu(sb->raid_disks)
+				 / (layout&255) / ((layout>>8)&255);
 		}
 		if (ddsks)
-			printf("     Array Size : %llu%s\n", ddsks*(unsigned long long)sb->size, human_size(ddsks*sb->size<<9));
+			printf("     Array Size : %llu%s\n",
+			       ddsks*(unsigned long long)__le64_to_cpu(sb->size),
+			       human_size(ddsks*__le64_to_cpu(sb->size)<<9));
 		if (sb->size != sb->data_size)
-			printf("      Used Size : %llu%s\n", (unsigned long long)sb->size, human_size(sb->size<<9));
+			printf("  Used Dev Size : %llu%s\n",
+			       (unsigned long long)__le64_to_cpu(sb->size),
+			       human_size(__le64_to_cpu(sb->size)<<9));
 	}
 	if (sb->data_offset)
-		printf("    Data Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->data_offset));
-	if (sb->super_offset)
-		printf("   Super Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->super_offset));
+		printf("    Data Offset : %llu sectors\n",
+		       (unsigned long long)__le64_to_cpu(sb->data_offset));
+	printf("   Super Offset : %llu sectors\n",
+	       (unsigned long long)__le64_to_cpu(sb->super_offset));
 	if (__le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)
 		printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->recovery_offset));
 	printf("          State : %s\n", (__le64_to_cpu(sb->resync_offset)+1)? "active":"clean");
@@ -195,10 +223,10 @@ static void examine_super1(void *sbv)
 	printf("\n");
 	if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
 		printf("Internal Bitmap : %ld sectors from superblock\n",
-		       (long)__le32_to_cpu(sb->bitmap_offset));
+		       (long)(int32_t)__le32_to_cpu(sb->bitmap_offset));
 	}
 	if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
-		printf("  Reshape pos'n : %llu%s\n", __le64_to_cpu(sb->reshape_position)/2,
+		printf("  Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb->reshape_position)/2,
 		       human_size(__le64_to_cpu(sb->reshape_position)<<9));
 		if (__le32_to_cpu(sb->delta_disks)) {
 			printf("  Delta Devices : %d", __le32_to_cpu(sb->delta_disks));
@@ -220,8 +248,9 @@ static void examine_super1(void *sbv)
 				printf("     New Layout : %s\n", c?c:"-unknown-");
 			}
 			if (__le32_to_cpu(sb->level) == 10) {
-				printf("     New Layout : near=%d, far=%d\n",
+				printf("     New Layout : near=%d, %s=%d\n",
 				       __le32_to_cpu(sb->new_layout)&255,
+				       (__le32_to_cpu(sb->new_layout)&0x10000)?"offset":"far",
 				       (__le32_to_cpu(sb->new_layout)>>8)&255);
 			}
 		}
@@ -252,8 +281,10 @@ static void examine_super1(void *sbv)
 	}
 	if (__le32_to_cpu(sb->level) == 10) {
 		int lo = __le32_to_cpu(sb->layout);
-		printf("         Layout : near=%d, far=%d\n",
-		       lo&255, (lo>>8)&255);
+		printf("         Layout : near=%d, %s=%d\n",
+		       lo&255,
+		       (lo&0x10000)?"offset":"far",
+		       (lo>>8)&255);
 	}
 	switch(__le32_to_cpu(sb->level)) {
 	case 0:
@@ -269,6 +300,18 @@ static void examine_super1(void *sbv)
 	default: break;
 	}
 	printf("\n");
+	printf("    Array Slot : %d (", __le32_to_cpu(sb->dev_number));
+	for (i= __le32_to_cpu(sb->max_dev); i> 0 ; i--)
+		if (__le16_to_cpu(sb->dev_roles[i-1]) != 0xffff)
+			break;
+	for (d=0; d < i; d++) {
+		int role = __le16_to_cpu(sb->dev_roles[d]);
+		if (d) printf(", ");
+		if (role == 0xffff) printf("empty");
+		else if(role == 0xfffe) printf("failed");
+		else printf("%d", role);
+	}
+	printf(")\n");
 	printf("   Array State : ");
 	for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
 		int cnt = 0;
@@ -298,31 +341,86 @@ static void examine_super1(void *sbv)
 }
 
 
-static void brief_examine_super1(void *sbv)
+static void brief_examine_super1(struct supertype *st)
 {
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 	int i;
-
+	unsigned long long sb_offset;
+	char *nm;
 	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);
+	nm = strchr(sb->set_name, ':');
+	if (nm)
+		nm++;
+	else if (sb->set_name[0])
+		nm = sb->set_name;
+	else
+		nm = "??";
+
+	printf("ARRAY /dev/md/%s level=%s ", nm, c?c:"-unknown-");
+	sb_offset = __le64_to_cpu(sb->super_offset);
+	if (sb_offset <= 4)
+		printf("metadata=1.1 ");
+	else if (sb_offset <= 8)
+		printf("metadata=1.2 ");
+	else
+		printf("metadata=1.0 ");
+	printf("num-devices=%d UUID=", __le32_to_cpu(sb->raid_disks));
 	for (i=0; i<16; i++) {
-		printf("%02x", sb->set_uuid[i]);
 		if ((i&3)==0 && i != 0) printf(":");
+		printf("%02x", sb->set_uuid[i]);
 	}
 	if (sb->set_name[0])
 		printf(" name=%.32s", sb->set_name);
 	printf("\n");
 }
 
-static void detail_super1(void *sbv)
+static void export_examine_super1(struct supertype *st)
 {
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 	int i;
+	int len = 32;
+
+	printf("MD_LEVEL=%s\n", map_num(pers, __le32_to_cpu(sb->level)));
+	printf("MD_DEVICES=%d\n", __le32_to_cpu(sb->raid_disks));
+	for (i=0; i<32; i++)
+		if (sb->set_name[i] == '\n' ||
+		    sb->set_name[i] == '\0') {
+			len = i;
+			break;
+		}
+	if (len)
+		printf("MD_NAME=%.*s\n", len, sb->set_name);
+	printf("MD_UUID=");
+	for (i=0; i<16; i++) {
+		if ((i&3)==0 && i != 0) printf(":");
+		printf("%02x", sb->set_uuid[i]);
+	}
+	printf("\n");
+	printf("MD_UPDATE_TIME=%llu\n",
+	       __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL);
+	printf("MD_DEV_UUID=");
+	for (i=0; i<16; i++) {
+		if ((i&3)==0 && i != 0) printf(":");
+		printf("%02x", sb->device_uuid[i]);
+	}
+	printf("\n");
+	printf("MD_EVENTS=%llu\n",
+	       (unsigned long long)__le64_to_cpu(sb->events));
+}
 
-	printf("           Name : %.32s\n", sb->set_name);
-	printf("           UUID : ");
+static void detail_super1(struct supertype *st, char *homehost)
+{
+	struct mdp_superblock_1 *sb = st->sb;
+	int i;
+	int l = homehost ? strlen(homehost) : 0;
+
+	printf("           Name : %.32s", sb->set_name);
+	if (l > 0 && l < 32 &&
+	    sb->set_name[l] == ':' &&
+	    strncmp(sb->set_name, homehost, l) == 0)
+		printf("  (local to host %s)", homehost);
+	printf("\n           UUID : ");
 	for (i=0; i<16; i++) {
 		if ((i&3)==0 && i != 0) printf(":");
 		printf("%02x", sb->set_uuid[i]);
@@ -330,9 +428,9 @@ static void detail_super1(void *sbv)
 	printf("\n         Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
 }
 
-static void brief_detail_super1(void *sbv)
+static void brief_detail_super1(struct supertype *st)
 {
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 	int i;
 
 	if (sb->set_name[0])
@@ -344,20 +442,52 @@ static void brief_detail_super1(void *sbv)
 	}
 }
 
+static void export_detail_super1(struct supertype *st)
+{
+	struct mdp_superblock_1 *sb = st->sb;
+	int i;
+	int len = 32;
+
+	for (i=0; i<32; i++)
+		if (sb->set_name[i] == '\n' ||
+		    sb->set_name[i] == '\0') {
+			len = i;
+			break;
+		}
+	if (len)
+		printf("MD_NAME=%.*s\n", len, sb->set_name);
+	printf("MD_UUID=");
+	for (i=0; i<16; i++) {
+		if ((i&3)==0 && i != 0) printf(":");
+		printf("%02x", sb->set_uuid[i]);
+	}
+	printf("\n");
+}
+
 #endif
 
-static void uuid_from_super1(int uuid[4], void * sbv)
+static int match_home1(struct supertype *st, char *homehost)
+{
+	struct mdp_superblock_1 *sb = st->sb;
+	int l = homehost ? strlen(homehost) : 0;
+
+	return (l > 0 && l < 32 &&
+		sb->set_name[l] == ':' &&
+		strncmp(sb->set_name, homehost, l) == 0);
+}
+
+static void uuid_from_super1(struct supertype *st, int uuid[4])
 {
-	struct mdp_superblock_1 *super = sbv;
+	struct mdp_superblock_1 *super = st->sb;
 	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, mddev_ident_t ident, void *sbv)
+static void getinfo_super1(struct supertype *st, struct mdinfo *info)
 {
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 	int working = 0;
 	int i;
 	int role;
@@ -370,6 +500,14 @@ static void getinfo_super1(struct mdinfo *info, mddev_ident_t ident, void *sbv)
 	info->array.layout = __le32_to_cpu(sb->layout);
 	info->array.md_minor = -1;
 	info->array.ctime = __le64_to_cpu(sb->ctime);
+	info->array.utime = __le64_to_cpu(sb->utime);
+	info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
+	info->array.state =
+		(__le64_to_cpu(sb->resync_offset) >= __le64_to_cpu(sb->size))
+		? 1 : 0;
+
+	info->data_offset = __le64_to_cpu(sb->data_offset);
+	info->component_size = __le64_to_cpu(sb->size);
 
 	info->disk.major = 0;
 	info->disk.minor = 0;
@@ -396,8 +534,18 @@ static void getinfo_super1(struct mdinfo *info, mddev_ident_t ident, void *sbv)
 
 	memcpy(info->uuid, sb->set_uuid, 16);
 
-	strncpy(ident->name, sb->set_name, 32);
-	ident->name[32] = 0;
+	strncpy(info->name, sb->set_name, 32);
+	info->name[32] = 0;
+
+	if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
+		info->reshape_active = 1;
+		info->reshape_progress = __le64_to_cpu(sb->reshape_position);
+		info->new_level = __le32_to_cpu(sb->new_level);
+		info->delta_disks = __le32_to_cpu(sb->delta_disks);
+		info->new_layout = __le32_to_cpu(sb->new_layout);
+		info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
+	} else
+		info->reshape_active = 0;
 
 	for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
 		role = __le16_to_cpu(sb->dev_roles[i]);
@@ -408,16 +556,34 @@ static void getinfo_super1(struct mdinfo *info, mddev_ident_t ident, void *sbv)
 	info->array.working_disks = working;
 }
 
-static int update_super1(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
+static int update_super1(struct supertype *st, struct mdinfo *info,
+			 char *update,
+			 char *devname, int verbose,
+			 int uuid_set, char *homehost)
 {
+	/* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
+	 * For others, the return value is ignored.
+	 */
 	int rv = 0;
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 
-	if (strcmp(update, "force")==0) {
+	if (strcmp(update, "force-one")==0) {
+		/* Not enough devices for a working array,
+		 * so bring this one up-to-date
+		 */
+		if (sb->events != __cpu_to_le64(info->events))
+			rv = 1;
 		sb->events = __cpu_to_le64(info->events);
+	}
+	if (strcmp(update, "force-array")==0) {
+		/* Degraded array and 'force' requests to
+		 * maybe need to mark it 'clean'.
+		 */
 		switch(__le32_to_cpu(sb->level)) {
 		case 5: case 4: case 6:
 			/* need to force clean */
+			if (sb->resync_offset != ~0ULL)
+				rv = 1;
 			sb->resync_offset = ~0ULL;
 		}
 	}
@@ -433,50 +599,107 @@ static int update_super1(struct mdinfo *info, void *sbv, char *update, char *dev
 			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];
+	if (strcmp(update, "linear-grow-new") == 0) {
+		int i;
+		int rfd;
+		int max = __le32_to_cpu(sb->max_dev);
+
+		for (i=0 ; i < max ; i++)
+			if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
+				break;
+		sb->dev_number = __cpu_to_le32(i);
+		info->disk.number = i;
+		if (max >= __le32_to_cpu(sb->max_dev))
+			sb->max_dev = __cpu_to_le32(max+1);
+
+		if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
+		    read(rfd, sb->device_uuid, 16) != 16) {
+			*(__u32*)(sb->device_uuid) = random();
+			*(__u32*)(sb->device_uuid+4) = random();
+			*(__u32*)(sb->device_uuid+8) = random();
+			*(__u32*)(sb->device_uuid+12) = random();
+		}
+
+		sb->dev_roles[i] =
+			__cpu_to_le16(info->disk.raid_disk);
 	}
-#endif
-	if (strcmp(update, "grow") == 0) {
+	if (strcmp(update, "linear-grow-update") == 0) {
 		sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
-		/* FIXME */
+		sb->dev_roles[info->disk.number] =
+			__cpu_to_le16(info->disk.raid_disk);
 	}
 	if (strcmp(update, "resync") == 0) {
 		/* make sure resync happens */
-		sb->resync_offset = ~0ULL;
+		sb->resync_offset = 0ULL;
 	}
-	if (strcmp(update, "uuid") == 0)
-		memcpy(sb->set_uuid, info->uuid, 16);
+	if (strcmp(update, "uuid") == 0) {
+		copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
+
+		if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
+			struct bitmap_super_s *bm;
+			bm = (struct bitmap_super_s*)(st->sb+1024);
+			memcpy(bm->uuid, sb->set_uuid, 16);
+		}
+	}
+	if (strcmp(update, "homehost") == 0 &&
+	    homehost) {
+		char *c;
+		update = "name";
+		c = strchr(sb->set_name, ':');
+		if (c)
+			strncpy(info->name, c+1, 31 - (c-sb->set_name));
+		else
+			strncpy(info->name, sb->set_name, 32);
+		info->name[32] = 0;
+	}
+	if (strcmp(update, "name") == 0) {
+		if (info->name[0] == 0)
+			sprintf(info->name, "%d", info->array.md_minor);
+		memset(sb->set_name, 0, sizeof(sb->set_name));
+		if (homehost &&
+		    strchr(info->name, ':') == NULL &&
+		    strlen(homehost)+1+strlen(info->name) < 32) {
+			strcpy(sb->set_name, homehost);
+			strcat(sb->set_name, ":");
+			strcat(sb->set_name, info->name);
+		} else
+			strcpy(sb->set_name, info->name);
+	}
+	if (strcmp(update, "devicesize") == 0 &&
+	    __le64_to_cpu(sb->super_offset) <
+	    __le64_to_cpu(sb->data_offset)) {
+		/* set data_size to device size less data_offset */
+		struct misc_dev_info *misc = (struct misc_dev_info*)
+			(st->sb + 1024 + sizeof(struct bitmap_super_s));
+		printf("Size was %llu\n", (unsigned long long)
+		       __le64_to_cpu(sb->data_size));
+		sb->data_size = __cpu_to_le64(
+			misc->device_size - __le64_to_cpu(sb->data_offset));
+		printf("Size is %llu\n", (unsigned long long)
+		       __le64_to_cpu(sb->data_size));
+	}
+	if (strcmp(update, "_reshape_progress")==0)
+		sb->reshape_position = __cpu_to_le64(info->reshape_progress);
 
 	sb->sb_csum = calc_sb_1_csum(sb);
 	return rv;
 }
 
-
-static __u64 event_super1(void *sbv)
+static int init_super1(struct supertype *st, mdu_array_info_t *info,
+		       unsigned long long size, char *name, char *homehost, int *uuid)
 {
-	struct mdp_superblock_1 *sb = sbv;
-	return __le64_to_cpu(sb->events);
-}
-
-static int init_super1(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *name)
-{
-	struct mdp_superblock_1 *sb = malloc(1024 + sizeof(bitmap_super_t));
+	struct mdp_superblock_1 *sb = malloc(1024 + sizeof(bitmap_super_t) +
+					     sizeof(struct misc_dev_info));
 	int spares;
 	int rfd;
+	char defname[10];
 	memset(sb, 0, 1024);
 
-	if (info->major_version == -1)
+	st->sb = sb;
+	if (info->major_version == -1) {
 		/* zeroing superblock */
 		return 0;
+	}
 
 	spares = info->working_disks - info->active_disks;
 	if (info->raid_disks + spares  > 384) {
@@ -485,23 +708,37 @@ static int init_super1(struct supertype *st, void **sbp, mdu_array_info_t *info,
 		return 0;
 	}
 
-
 	sb->magic = __cpu_to_le32(MD_SB_MAGIC);
 	sb->major_version = __cpu_to_le32(1);
 	sb->feature_map = 0;
 	sb->pad0 = 0;
 
-	if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
-	    read(rfd, sb->set_uuid, 16) != 16) {
-		*(__u32*)(sb->set_uuid) = random();
-		*(__u32*)(sb->set_uuid+4) = random();
-		*(__u32*)(sb->set_uuid+8) = random();
-		*(__u32*)(sb->set_uuid+12) = random();
+	if (uuid)
+		copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
+	else {
+		if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
+		    read(rfd, sb->set_uuid, 16) != 16) {
+			*(__u32*)(sb->set_uuid) = random();
+			*(__u32*)(sb->set_uuid+4) = random();
+			*(__u32*)(sb->set_uuid+8) = random();
+			*(__u32*)(sb->set_uuid+12) = random();
+		}
+		if (rfd >= 0) close(rfd);
 	}
-	if (rfd >= 0) close(rfd);
 
+	if (name == NULL || *name == 0) {
+		sprintf(defname, "%d", info->md_minor);
+		name = defname;
+	}
 	memset(sb->set_name, 0, 32);
-	strcpy(sb->set_name, name);
+	if (homehost &&
+	    strchr(name, ':')== NULL &&
+	    strlen(homehost)+1+strlen(name) < 32) {
+		strcpy(sb->set_name, homehost);
+		strcat(sb->set_name, ":");
+		strcat(sb->set_name, name);
+	} else
+		strcpy(sb->set_name, name);
 
 	sb->ctime = __cpu_to_le64((unsigned long long)time(0));
 	sb->level = __cpu_to_le32(info->level);
@@ -527,41 +764,54 @@ static int init_super1(struct supertype *st, void **sbp, mdu_array_info_t *info,
 
 	memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
 
-	*sbp = sb;
 	return 1;
 }
 
+struct devinfo {
+	int fd;
+	char *devname;
+	mdu_disk_info_t disk;
+	struct devinfo *next;
+};
 /* Add a device to the superblock being created */
-static void add_to_super1(void *sbv, mdu_disk_info_t *dk)
+static void add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
+			  int fd, char *devname)
 {
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 	__u16 *rp = sb->dev_roles + dk->number;
+	struct devinfo *di, **dip;
+
 	if ((dk->state & 6) == 6) /* active, sync */
 		*rp = __cpu_to_le16(dk->raid_disk);
 	else if ((dk->state & ~2) == 0) /* active or idle -> spare */
 		*rp = 0xffff;
 	else
 		*rp = 0xfffe;
+
+	dip = (struct devinfo **)&st->info;
+	while (*dip)
+		dip = &(*dip)->next;
+	di = malloc(sizeof(struct devinfo));
+	di->fd = fd;
+	di->devname = devname;
+	di->disk = *dk;
+	di->next = NULL;
+	*dip = di;
 }
 
-static int store_super1(struct supertype *st, int fd, void *sbv)
+static void locate_bitmap1(struct supertype *st, int fd);
+
+static int store_super1(struct supertype *st, int fd)
 {
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 	unsigned long long sb_offset;
 	int sbsize;
-	unsigned long size;
 	unsigned long long dsize;
 
-#ifdef BLKGETSIZE64
-	if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
-#endif
-	{
-		if (ioctl(fd, BLKGETSIZE, &size))
-			return 1;
-		else
-			dsize = (unsigned long long)size;
-	} else
-		dsize >>= 9;
+	if (!get_dev_size(fd, NULL, &dsize))
+		return 1;
+
+	dsize >>= 9;
 
 	if (dsize < 24)
 		return 2;
@@ -607,134 +857,167 @@ static int store_super1(struct supertype *st, int fd, void *sbv)
 	if (write(fd, sb, sbsize) != sbsize)
 		return 4;
 
+	if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
+		struct bitmap_super_s *bm = (struct bitmap_super_s*)
+			(((char*)sb)+1024);
+		if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
+			locate_bitmap1(st, fd);
+			if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
+			    return 5;
+		}
+	}
 	fsync(fd);
 	return 0;
 }
 
-static int load_super1(struct supertype *st, int fd, void **sbp, char *devname);
+static int load_super1(struct supertype *st, int fd, char *devname);
 
-static int write_init_super1(struct supertype *st, void *sbv,
-			     mdu_disk_info_t *dinfo, char *devname)
+static unsigned long choose_bm_space(unsigned long devsize)
 {
-	struct mdp_superblock_1 *sb = sbv;
-	void *refsbv = NULL;
-	int fd = open(devname, O_RDWR | O_EXCL);
-	int rfd;
-	int rv;
+	/* if the device is bigger than 8Gig, save 64k for bitmap usage,
+	 * if bigger than 200Gig, save 128k
+	 */
+	if (devsize < 64*2) return 0;
+	if (devsize - 64*2 >= 200*1024*1024*2)
+		return 128*2;
+	if (devsize - 4*2 > 8*1024*1024*2)
+		return 64*2;
+	return 4*2;
+}
 
-	unsigned long size, space;
+#ifndef MDASSEMBLE
+static int write_init_super1(struct supertype *st)
+{
+	struct mdp_superblock_1 *sb = st->sb;
+	struct supertype refst;
+	int rfd;
+	int rv = 0;
+	int bm_space;
+	struct devinfo *di;
 	unsigned long long dsize, array_size;
 	long long sb_offset;
 
+	for (di = st->info; di && ! rv ; di = di->next) {
+		if (di->disk.state == 1)
+			continue;
 
-	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);
-	if (dinfo->state & (1<<MD_DISK_WRITEMOSTLY))
-		sb->devflags |= WriteMostly1;
-
-	if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
-	    read(rfd, sb->device_uuid, 16) != 16) {
-		*(__u32*)(sb->device_uuid) = random();
-		*(__u32*)(sb->device_uuid+4) = random();
-		*(__u32*)(sb->device_uuid+8) = random();
-		*(__u32*)(sb->device_uuid+12) = random();
-	}
-	if (rfd >= 0) close(rfd);
-	sb->events = 0;
-
-	if (load_super1(st, fd, &refsbv, NULL)==0) {
-		struct mdp_superblock_1 *refsb = refsbv;
+		Kill(di->devname, 0, 1, 1);
+		Kill(di->devname, 0, 1, 1);
 
-		memcpy(sb->device_uuid, refsb->device_uuid, 16);
-		if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
-			/* same array, so preserve events and dev_number */
-			sb->events = refsb->events;
-			sb->dev_number = refsb->dev_number;
+		if (di->fd < 0) {
+			fprintf(stderr,
+				Name": Failed to open %s to write superblock\n",
+				di->devname);
+			return -1;
+		}
+		sb->dev_number = __cpu_to_le32(di->disk.number);
+		if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
+			sb->devflags |= __cpu_to_le32(WriteMostly1);
+
+		if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
+		    read(rfd, sb->device_uuid, 16) != 16) {
+			*(__u32*)(sb->device_uuid) = random();
+			*(__u32*)(sb->device_uuid+4) = random();
+			*(__u32*)(sb->device_uuid+8) = random();
+			*(__u32*)(sb->device_uuid+12) = random();
+		}
+		if (rfd >= 0) close(rfd);
+		sb->events = 0;
+
+		refst =*st;
+		refst.sb = NULL;
+		if (load_super1(&refst, di->fd, NULL)==0) {
+			struct mdp_superblock_1 *refsb = refst.sb;
+
+			memcpy(sb->device_uuid, refsb->device_uuid, 16);
+			if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
+				/* same array, so preserve events and
+				 * dev_number */
+				sb->events = refsb->events;
+				/* bugs in 2.6.17 and earlier mean the
+				 * dev_number chosen in Manage must be preserved
+				 */
+				if (get_linux_version() >= 2006018)
+					sb->dev_number = refsb->dev_number;
+			}
+			free(refsb);
 		}
-		free(refsb);
-	}
 
-#ifdef BLKGETSIZE64
-	if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
-#endif
-	{
-		if (ioctl(fd, BLKGETSIZE, &size))
+		if (!get_dev_size(di->fd, NULL, &dsize))
 			return 1;
-		else
-			dsize = size;
-	} else
 		dsize >>= 9;
 
-	if (dsize < 24) {
-		close(fd);
-		return 2;
-	}
+		if (dsize < 24) {
+			close(di->fd);
+			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.
-	 * Depending on the array size, we might leave extra space
-	 * for a bitmap.
-	 */
-	array_size = __le64_to_cpu(sb->size);
-	switch(st->minor_version) {
-	case 0:
-		sb_offset = dsize;
-		sb_offset -= 8*2;
-		sb_offset &= ~(4*2-1);
-		sb->super_offset = __cpu_to_le64(sb_offset);
-		sb->data_offset = __cpu_to_le64(0);
-		if (sb_offset-64*2 >= array_size)
-			sb->data_size = __cpu_to_le64(sb_offset-64*2);
-		else
-			sb->data_size = __cpu_to_le64(sb_offset);
-		break;
-	case 1:
-		sb->super_offset = __cpu_to_le64(0);
-		if (dsize - 64*2 >= array_size)
-			space = 64*2;
-		else
-			space = 4*2;
-		sb->data_offset = __cpu_to_le64(space); /* leave space for super and bitmap */
-		sb->data_size = __cpu_to_le64(dsize - space);
-		break;
-	case 2:
-		sb_offset = 4*2;
-		if (dsize - 4*2 - 64*2 >= array_size)
-			space = 64*2;
-		else
-			space = 4*2;
-		sb->super_offset = __cpu_to_le64(sb_offset);
-		sb->data_offset = __cpu_to_le64(sb_offset+space);
-		sb->data_size = __cpu_to_le64(dsize - 4*2 - space);
-		break;
-	default:
-		return -EINVAL;
-	}
+		/*
+		 * 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.
+		 * Depending on the array size, we might leave extra space
+		 * for a bitmap.
+		 */
+		array_size = __le64_to_cpu(sb->size);
+		/* work out how much space we left for a bitmap */
+		bm_space = choose_bm_space(array_size);
+
+		switch(st->minor_version) {
+		case 0:
+			sb_offset = dsize;
+			sb_offset -= 8*2;
+			sb_offset &= ~(4*2-1);
+			sb->super_offset = __cpu_to_le64(sb_offset);
+			sb->data_offset = __cpu_to_le64(0);
+		if (sb_offset - bm_space < array_size)
+			bm_space = sb_offset - array_size;
+			sb->data_size = __cpu_to_le64(sb_offset - bm_space);
+			break;
+		case 1:
+			sb->super_offset = __cpu_to_le64(0);
+			if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
+				bm_space = dsize - __le64_to_cpu(sb->size) -4*2;
+			sb->data_offset = __cpu_to_le64(bm_space + 4*2);
+			sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
+			break;
+		case 2:
+			sb_offset = 4*2;
+			sb->super_offset = __cpu_to_le64(4*2);
+			if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
+			    > dsize)
+				bm_space = dsize - __le64_to_cpu(sb->size)
+					- 4*2 - 4*2;
+			sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
+			sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2
+						      - bm_space );
+			break;
+		default:
+			return -EINVAL;
+		}
 
 
-	sb->sb_csum = calc_sb_1_csum(sb);
-	rv = store_super1(st, fd, sb);
-	if (rv)
-		fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
+		sb->sb_csum = calc_sb_1_csum(sb);
+		rv = store_super1(st, di->fd);
+		if (rv)
+			fprintf(stderr,
+				Name ": failed to write superblock to %s\n",
+				di->devname);
 
-	if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
-		rv = st->ss->write_bitmap(st, fd, sbv);
-	close(fd);
+		if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
+			rv = st->ss->write_bitmap(st, di->fd);
+		close(di->fd);
+		di->fd = -1;
+	}
 	return rv;
 }
+#endif
 
-static int compare_super1(void **firstp, void *secondv)
+static int compare_super1(struct supertype *st, struct supertype *tst)
 {
 	/*
 	 * return:
@@ -743,8 +1026,8 @@ static int compare_super1(void **firstp, void *secondv)
 	 *  2 wrong uuid
 	 *  3 wrong other info
 	 */
-	struct mdp_superblock_1 *first = *firstp;
-	struct mdp_superblock_1 *second = secondv;
+	struct mdp_superblock_1 *first = st->sb;
+	struct mdp_superblock_1 *second = tst->sb;
 
 	if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
 		return 1;
@@ -752,9 +1035,11 @@ static int compare_super1(void **firstp, void *secondv)
 		return 1;
 
 	if (!first) {
-		first = malloc(1024);
-		memcpy(first, second, 1024);
-		*firstp = first;
+		first = malloc(1024+sizeof(bitmap_super_t) +
+			       sizeof(struct misc_dev_info));
+		memcpy(first, second, 1024+sizeof(bitmap_super_t) +
+		       sizeof(struct misc_dev_info));
+		st->sb = first;
 		return 0;
 	}
 	if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
@@ -770,60 +1055,56 @@ static int compare_super1(void **firstp, void *secondv)
 	return 0;
 }
 
-static int load_super1(struct supertype *st, int fd, void **sbp, char *devname)
+static void free_super1(struct supertype *st);
+
+static int load_super1(struct supertype *st, int fd, char *devname)
 {
-	unsigned long size;
 	unsigned long long dsize;
 	unsigned long long sb_offset;
 	struct mdp_superblock_1 *super;
+	int uuid[4];
+	struct bitmap_super_s *bsb;
+	struct misc_dev_info *misc;
 
+	free_super1(st);
 
-
-	if (st->ss == NULL) {
+	if (st->ss == NULL || st->minor_version == -1) {
 		int bestvers = -1;
+		struct supertype tst;
 		__u64 bestctime = 0;
 		/* guess... choose latest ctime */
-		st->ss = &super1;
-		for (st->minor_version = 0; st->minor_version <= 2 ; st->minor_version++) {
-			switch(load_super1(st, fd, sbp, devname)) {
-			case 0: super = *sbp;
+		tst.ss = &super1;
+		tst.sb = NULL;
+		for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
+			switch(load_super1(&tst, fd, devname)) {
+			case 0: super = tst.sb;
 				if (bestvers == -1 ||
 				    bestctime < __le64_to_cpu(super->ctime)) {
-					bestvers = st->minor_version;
+					bestvers = tst.minor_version;
 					bestctime = __le64_to_cpu(super->ctime);
 				}
 				free(super);
-				*sbp = NULL;
+				tst.sb = NULL;
 				break;
-			case 1: st->ss = NULL; return 1; /*bad device */
+			case 1: return 1; /*bad device */
 			case 2: break; /* bad, try next */
 			}
 		}
 		if (bestvers != -1) {
 			int rv;
-			st->minor_version = bestvers;
-			st->ss = &super1;
-			st->max_devs = 384;
-			rv = load_super1(st, fd, sbp, devname);
-			if (rv) st->ss = NULL;
+			tst.minor_version = bestvers;
+			tst.ss = &super1;
+			tst.max_devs = 384;
+			rv = load_super1(&tst, fd, devname);
+			if (rv == 0)
+				*st = tst;
 			return rv;
 		}
-		st->ss = NULL;
 		return 2;
 	}
-#ifdef BLKGETSIZE64
-	if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
-#endif
-	{
-		if (ioctl(fd, BLKGETSIZE, &size)) {
-			if (devname)
-				fprintf(stderr, Name ": cannot find device size for %s: %s\n",
-					devname, strerror(errno));
-			return 1;
-		}
-		dsize = size;
-	} else
-		dsize >>= 9;
+	if (!get_dev_size(fd, devname, &dsize))
+		return 1;
+	dsize >>= 9;
 
 	if (dsize < 24) {
 		if (devname)
@@ -835,7 +1116,7 @@ static int load_super1(struct supertype *st, int fd, void **sbp, char *devname)
 	/*
 	 * Calculate the position of the superblock.
 	 * It is always aligned to a 4K boundary and
-	 * depeding on minor_version, it can be:
+	 * 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.
@@ -866,7 +1147,8 @@ static int load_super1(struct supertype *st, int fd, void **sbp, char *devname)
 		return 1;
 	}
 
-	super = malloc(1024 + sizeof(bitmap_super_t));
+	super = malloc(1024 + sizeof(bitmap_super_t) +
+		       sizeof(struct misc_dev_info));
 
 	if (read(fd, super, 1024) != 1024) {
 		if (devname)
@@ -898,7 +1180,33 @@ static int load_super1(struct supertype *st, int fd, void **sbp, char *devname)
 		free(super);
 		return 2;
 	}
-	*sbp = super;
+	st->sb = super;
+
+	bsb = (struct bitmap_super_s *)(((char*)super)+1024);
+
+	misc = (struct misc_dev_info*) (bsb+1);
+	misc->device_size = dsize;
+
+	/* Now check on the bitmap superblock */
+	if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
+		return 0;
+	/* Read the bitmap superblock and make sure it looks
+	 * valid.  If it doesn't clear the bit.  An --assemble --force
+	 * should get that written out.
+	 */
+	locate_bitmap1(st, fd);
+	if (read(fd, ((char*)super)+1024, sizeof(struct bitmap_super_s))
+	    != sizeof(struct bitmap_super_s))
+		goto no_bitmap;
+
+	uuid_from_super1(st, uuid);
+	if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
+	    memcmp(bsb->uuid, uuid, 16) != 0)
+		goto no_bitmap;
+	return 0;
+
+ no_bitmap:
+	super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
 	return 0;
 }
 
@@ -910,8 +1218,8 @@ static struct supertype *match_metadata_desc1(char *arg)
 
 	st->ss = &super1;
 	st->max_devs = 384;
-	if (strcmp(arg, "1") == 0 ||
-	    strcmp(arg, "1.0") == 0) {
+	st->sb = NULL;
+	if (strcmp(arg, "1.0") == 0) {
 		st->minor_version = 0;
 		return st;
 	}
@@ -923,6 +1231,11 @@ static struct supertype *match_metadata_desc1(char *arg)
 		st->minor_version = 2;
 		return st;
 	}
+	if (strcmp(arg, "1") == 0 ||
+	    strcmp(arg, "default") == 0) {
+		st->minor_version = -1;
+		return st;
+	}
 
 	free(st);
 	return NULL;
@@ -937,15 +1250,12 @@ static __u64 avail_size1(struct supertype *st, __u64 devsize)
 	if (devsize < 24)
 		return 0;
 
-	/* if the device is bigger than 8Gig, save 64k for bitmap usage,
-	 * if biffer than 200Gig, save 128k
-	 */
-	if (devsize > 200*1024*1024*2)
-		devsize -= 128*2;
-	else if (devsize > 8*1024*1024*2)
-		devsize -= 64*2;
+	devsize -= choose_bm_space(devsize);
 
 	switch(st->minor_version) {
+	case -1: /* no specified.  Now time to set default */
+		st->minor_version = 0;
+		/* FALL THROUGH */
 	case 0:
 		/* at end */
 		return ((devsize - 8*2 ) & ~(4*2-1));
@@ -960,8 +1270,9 @@ static __u64 avail_size1(struct supertype *st, __u64 devsize)
 }
 
 static int
-add_internal_bitmap1(struct supertype *st, void *sbv,
-		     int chunk, int delay, int write_behind, unsigned long long size,
+add_internal_bitmap1(struct supertype *st,
+		     int *chunkp, int delay, int write_behind,
+		     unsigned long long size,
 		     int may_change, int major)
 {
 	/*
@@ -969,22 +1280,77 @@ add_internal_bitmap1(struct supertype *st, void *sbv,
 	 * must fit after the superblock.
 	 * If may_change, then this is create, and we can put the bitmap
 	 * before the superblock if we like, or may move the start.
-	 * For now, just squeeze the bitmap into 3k and don't change anything.
+	 * If !may_change, the bitmap MUST live at offset of 1K, until
+	 * we get a sysfs interface.
 	 *
 	 * size is in sectors,  chunk is in bytes !!!
 	 */
 
 	unsigned long long bits;
-	unsigned long long max_bits = (3*512 - sizeof(bitmap_super_t)) * 8;
+	unsigned long long max_bits;
 	unsigned long long min_chunk;
-	struct mdp_superblock_1 *sb = sbv;
+	long offset;
+	int chunk = *chunkp;
+	int room = 0;
+	struct mdp_superblock_1 *sb = st->sb;
 	bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
 
-	if (st->minor_version && !may_change &&
-	    __le64_to_cpu(sb->data_offset) - __le64_to_cpu(sb->super_offset) < 8)
-		return 0; /* doesn't fit */
+	switch(st->minor_version) {
+	case 0:
+		/* either 3K after the superblock, or some amount of space
+		 * before.
+		 */
+		if (may_change) {
+			/* We are creating array, so we *know* how much room has
+			 * been left.
+			 */
+			offset = 0;
+			room = choose_bm_space(__le64_to_cpu(sb->size));
+			if (room == 4*2) {
+				/* make it 3K after the superblock */
+				room = 3*2;
+				offset = 2;
+			}
+		} else {
+			room = __le64_to_cpu(sb->super_offset)
+				- __le64_to_cpu(sb->data_offset)
+				- __le64_to_cpu(sb->data_size);
+			/* remove '1 ||' when we can set offset via sysfs */
+			if (1 || (room < 3*2 &&
+				  __le32_to_cpu(sb->max_dev) <= 384)) {
+				room = 3*2;
+				offset = 1*2;
+			} else {
+				offset = 0; /* means movable offset */
+			}
+		}
+		break;
+	case 1:
+	case 2: /* between superblock and data */
+		if (may_change) {
+			offset = 4*2;
+			room = choose_bm_space(__le64_to_cpu(sb->size));
+		} else {
+			room = __le64_to_cpu(sb->data_offset)
+				- __le64_to_cpu(sb->super_offset);
+			if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
+				room -= 2;
+				offset = 2;
+			} else {
+				room -= 4*2;
+				offset = 4*2;
+			}
+		}
+		break;
+	default:
+		return 0;
+	}
 
+	if (chunk == UnSet && room > 128*2)
+		/* Limit to 128K of bitmap when chunk size not requested */
+		room = 128*2;
 
+	max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
 
 	min_chunk = 4096; /* sub-page chunks don't work yet.. */
 	bits = (size*512)/min_chunk +1;
@@ -999,52 +1365,63 @@ add_internal_bitmap1(struct supertype *st, void *sbv,
 	if (chunk == 0) /* rounding problem */
 		return 0;
 
-	sb->bitmap_offset = __cpu_to_le32(2);
+	if (offset == 0) {
+		bits = (size*512) / chunk + 1;
+		room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
+		offset = -room;
+	}
+
+	sb->bitmap_offset = __cpu_to_le32(offset);
 
 	sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
 	memset(bms, 0, sizeof(*bms));
 	bms->magic = __cpu_to_le32(BITMAP_MAGIC);
 	bms->version = __cpu_to_le32(major);
-	uuid_from_super1((int*)bms->uuid, sb);
+	uuid_from_super1(st, (int*)bms->uuid);
 	bms->chunksize = __cpu_to_le32(chunk);
 	bms->daemon_sleep = __cpu_to_le32(delay);
 	bms->sync_size = __cpu_to_le64(size);
 	bms->write_behind = __cpu_to_le32(write_behind);
 
+	*chunkp = chunk;
 	return 1;
 }
 
 
-void locate_bitmap1(struct supertype *st, int fd, void *sbv)
+static void locate_bitmap1(struct supertype *st, int fd)
 {
 	unsigned long long offset;
-	struct mdp_superblock_1 *sb = NULL;
+	struct mdp_superblock_1 *sb;
+	int mustfree = 0;
 
-	if (sbv)
-		sb = sbv;
-	else
-		if (st->ss->load_super(st, fd, (void **)&sb, NULL))
+	if (!st->sb) {
+		if (st->ss->load_super(st, fd, NULL))
 			return; /* no error I hope... */
+		mustfree = 1;
+	}
+	sb = st->sb;
 
 	offset = __le64_to_cpu(sb->super_offset);
-	offset += (long) __le32_to_cpu(sb->bitmap_offset);
-	if (!sbv)
+	offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
+	if (mustfree)
 		free(sb);
 	lseek64(fd, offset<<9, 0);
 }
 
-int write_bitmap1(struct supertype *st, int fd, void *sbv)
+static int write_bitmap1(struct supertype *st, int fd)
 {
-	struct mdp_superblock_1 *sb = sbv;
+	struct mdp_superblock_1 *sb = st->sb;
 	bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
 	int rv = 0;
 
 	int towrite, n;
 	char buf[4096];
 
-	locate_bitmap1(st, fd, sbv);
+	locate_bitmap1(st, fd);
 
-	write(fd, ((char*)sb)+1024, sizeof(bitmap_super_t));
+	if (write(fd, ((char*)sb)+1024, sizeof(bitmap_super_t)) !=
+	    sizeof(bitmap_super_t))
+		return -2;
 	towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
 	towrite = (towrite+7) >> 3; /* bits to bytes */
 	memset(buf, 0xff, sizeof(buf));
@@ -1065,21 +1442,59 @@ int write_bitmap1(struct supertype *st, int fd, void *sbv)
 	return rv;
 }
 
+static void free_super1(struct supertype *st)
+{
+	if (st->sb)
+		free(st->sb);
+	st->sb = NULL;
+}
+
+static int validate_geometry1(struct supertype *st, int level,
+			      int layout, int raiddisks,
+			      int chunk, unsigned long long size,
+			      char *subdev, unsigned long long *freesize)
+{
+	unsigned long long ldsize;
+	int fd;
+
+	if (level == LEVEL_CONTAINER)
+		return 0;
+	if (!subdev)
+		return 1;
+
+	fd = open(subdev, O_RDONLY|O_EXCL, 0);
+	if (fd < 0) {
+		fprintf(stderr, Name ": Cannot open %s: %s\n",
+			subdev, strerror(errno));
+		return 0;
+	}
+	if (!get_dev_size(fd, subdev, &ldsize)) {
+		close(fd);
+		return 0;
+	}
+	close(fd);
+
+	*freesize = avail_size1(st, ldsize >> 9);
+	return 1;
+}
+
 struct superswitch super1 = {
 #ifndef MDASSEMBLE
 	.examine_super = examine_super1,
 	.brief_examine_super = brief_examine_super1,
+	.export_examine_super = export_examine_super1,
 	.detail_super = detail_super1,
 	.brief_detail_super = brief_detail_super1,
+	.export_detail_super = export_detail_super1,
+	.write_init_super = write_init_super1,
 #endif
+	.match_home = match_home1,
 	.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,
@@ -1087,6 +1502,8 @@ struct superswitch super1 = {
 	.add_internal_bitmap = add_internal_bitmap1,
 	.locate_bitmap = locate_bitmap1,
 	.write_bitmap = write_bitmap1,
+	.free_super = free_super1,
+	.validate_geometry = validate_geometry1,
 	.major = 1,
 #if __BYTE_ORDER == BIG_ENDIAN
 	.swapuuid = 0,