imsm: initial Intel(R) Matrix Storage Manager support

From: Dan Williams <dan.j.williams@intel.com>

The following now work:
--examine
--examine --brief

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

5 files changed, 1083 insertions, 6 deletions

diff --git a/Makefile b/Makefile
index 1402322d..47654b9b 100644
--- a/Makefile
+++ b/Makefile
@@ -69,19 +69,19 @@ MAN8DIR = $(MANDIR)/man8
 OBJS =  mdadm.o config.o mdstat.o  ReadMe.o util.o Manage.o Assemble.o Build.o \
 	Create.o Detail.o Examine.o Grow.o Monitor.o dlink.o Kill.o Query.o \
 	Incremental.o \
-	mdopen.o super0.o super1.o super-ddf.o bitmap.o restripe.o sysfs.o \
-	sha1.o mapfile.o crc32.o
+	mdopen.o super0.o super1.o super-ddf.o super-intel.o bitmap.o \
+	restripe.o sysfs.o sha1.o mapfile.o crc32.o sg_io.o
 SRCS =  mdadm.c config.c mdstat.c  ReadMe.c util.c Manage.c Assemble.c Build.c \
 	Create.c Detail.c Examine.c Grow.c Monitor.c dlink.c Kill.c Query.c \
 	Incremental.c \
-	mdopen.c super0.c super1.c super-ddf.c bitmap.c restripe.c sysfs.c \
-	sha1.c mapfile.c crc32.c
+	mdopen.c super0.c super1.c super-ddf.c super-intel.c bitmap.c \
+	restripe.c sysfs.c sha1.c mapfile.c crc32.c sg_io.c
 
 STATICSRC = pwgr.c
 STATICOBJS = pwgr.o
 
 ASSEMBLE_SRCS := mdassemble.c Assemble.c Manage.c config.c dlink.c util.c \
-	super0.c super1.c super-ddf.c sha1.c crc32.c
+	super0.c super1.c super-ddf.c super-intel.c sha1.c crc32.c sg_io.c
 ASSEMBLE_FLAGS:= $(CFLAGS) -DMDASSEMBLE
 ifdef MDASSEMBLE_AUTO
 ASSEMBLE_SRCS += mdopen.c mdstat.c
diff --git a/mdadm.h b/mdadm.h
index dae73cce..a17043a5 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -393,6 +393,8 @@ extern struct superswitch {
 	int external;
 } super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];
 
+extern struct superswitch super_imsm, super_imsm_raid;
+
 struct supertype {
 	struct superswitch *ss;
 	int minor_version;
diff --git a/sg_io.c b/sg_io.c
new file mode 100644
index 00000000..4ae5d927
--- /dev/null
+++ b/sg_io.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2007 Intel Corporation
+ *
+ * 	Retrieve drive serial numbers for scsi disks
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <string.h>
+#include <scsi/scsi.h>
+#include <scsi/sg.h>
+#include <sys/ioctl.h>
+
+int scsi_get_serial(int fd, void *buf, size_t buf_len)
+{
+	unsigned char inq_cmd[] = {INQUIRY, 1, 0x80, 0, buf_len, 0};
+	unsigned char sense[32];
+	struct sg_io_hdr io_hdr;
+
+	memset(&io_hdr, 0, sizeof(io_hdr));
+	io_hdr.interface_id = 'S';
+	io_hdr.cmdp = inq_cmd;
+	io_hdr.cmd_len = sizeof(inq_cmd);
+	io_hdr.dxferp = buf;
+	io_hdr.dxfer_len = buf_len;
+	io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
+	io_hdr.sbp = sense;
+	io_hdr.mx_sb_len = sizeof(sense);
+	io_hdr.timeout = 5000;
+
+	return ioctl(fd, SG_IO, &io_hdr);
+}
diff --git a/super-intel.c b/super-intel.c
new file mode 100644
index 00000000..948c6b30
--- /dev/null
+++ b/super-intel.c
@@ -0,0 +1,1033 @@
+/*
+ * mdadm - Intel(R) Matrix Storage Manager Support
+ *
+ * Copyright (C) 2002-2007 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "mdadm.h"
+#include <values.h>
+#include <scsi/sg.h>
+#include <ctype.h>
+
+/* MPB == Metadata Parameter Block */
+#define MPB_SIGNATURE "Intel Raid ISM Cfg Sig. "
+#define MPB_SIG_LEN (strlen(MPB_SIGNATURE))
+#define MPB_VERSION_RAID0 "1.0.00"
+#define MPB_VERSION_RAID1 "1.1.00"
+#define MPB_VERSION_RAID5 "1.2.02"
+#define MAX_SIGNATURE_LENGTH  32
+#define MAX_RAID_SERIAL_LEN   16
+
+/* Disk configuration info. */
+#define IMSM_MAX_DEVICES 255
+struct imsm_disk {
+	__u8 serial[MAX_RAID_SERIAL_LEN];/* 0xD8 - 0xE7 ascii serial number */
+	__u32 total_blocks;		 /* 0xE8 - 0xEB total blocks */
+	__u32 scsi_id;			 /* 0xEC - 0xEF scsi ID */
+	__u32 status;			 /* 0xF0 - 0xF3 */
+#define SPARE_DISK      0x01  /* Spare */
+#define CONFIGURED_DISK 0x02  /* Member of some RaidDev */
+#define FAILED_DISK     0x04  /* Permanent failure */
+#define USABLE_DISK     0x08  /* Fully usable unless FAILED_DISK is set */
+
+#define	IMSM_DISK_FILLERS	5
+	__u32 filler[IMSM_DISK_FILLERS]; /* 0xF4 - 0x107 MPB_DISK_FILLERS for future expansion */
+};
+
+/* RAID map configuration infos. */
+struct imsm_map {
+	__u32 pba_of_lba0;	/* start address of partition */
+	__u32 blocks_per_member;/* blocks per member */
+	__u32 num_data_stripes;	/* number of data stripes */
+	__u16 blocks_per_strip;
+	__u8  map_state;	/* Normal, Uninitialized, Degraded, Failed */
+#define IMSM_T_STATE_NORMAL 0
+#define IMSM_T_STATE_UNINITIALIZED 1
+#define IMSM_T_STATE_DEGRADED 2 /* FIXME: is this correct? */
+#define IMSM_T_STATE_FAILED 3 /* FIXME: is this correct? */
+	__u8  raid_level;
+#define IMSM_T_RAID0 0
+#define IMSM_T_RAID1 1
+#define IMSM_T_RAID5 5		/* since metadata version 1.2.02 ? */
+	__u8  num_members;	/* number of member disks */
+	__u8  reserved[3];
+	__u32 filler[7];	/* expansion area */
+	__u32 disk_ord_tbl[1];	/* disk_ord_tbl[num_members],
+				   top byte special */
+} __attribute__ ((packed));
+
+struct imsm_vol {
+	__u32 reserved[2];
+	__u8  migr_state;	/* Normal or Migrating */
+	__u8  migr_type;	/* Initializing, Rebuilding, ... */
+	__u8  dirty;
+	__u8  fill[1];
+	__u32 filler[5];
+	struct imsm_map map[1];
+	/* here comes another one if migr_state */
+} __attribute__ ((packed));
+
+struct imsm_dev {
+	__u8	volume[MAX_RAID_SERIAL_LEN];
+	__u32 size_low;
+	__u32 size_high;
+	__u32 status;	/* Persistent RaidDev status */
+	__u32 reserved_blocks; /* Reserved blocks at beginning of volume */
+#define IMSM_DEV_FILLERS 12
+	__u32 filler[IMSM_DEV_FILLERS];
+	struct imsm_vol vol;
+} __attribute__ ((packed));
+
+struct imsm_super {
+	__u8 sig[MAX_SIGNATURE_LENGTH];	/* 0x00 - 0x1F */
+	__u32 check_sum;		/* 0x20 - 0x23 MPB Checksum */
+	__u32 mpb_size;			/* 0x24 - 0x27 Size of MPB */
+	__u32 family_num;		/* 0x28 - 0x2B Checksum from first time this config was written */
+	__u32 generation_num;		/* 0x2C - 0x2F Incremented each time this array's MPB is written */
+	__u32 reserved[2];		/* 0x30 - 0x37 */
+	__u8 num_disks;			/* 0x38 Number of configured disks */
+	__u8 num_raid_devs;		/* 0x39 Number of configured volumes */
+	__u8 fill[2];			/* 0x3A - 0x3B */
+#define IMSM_FILLERS 39
+	__u32 filler[IMSM_FILLERS];	/* 0x3C - 0xD7 RAID_MPB_FILLERS */
+	struct imsm_disk disk[1];	/* 0xD8 diskTbl[numDisks] */
+	/* here comes imsm_dev[num_raid_devs] */
+} __attribute__ ((packed));
+
+#ifndef MDASSEMBLE
+static char *map_state_str[] = { "normal", "uninitialized", "degraded", "failed" };
+#endif
+
+static unsigned long long mpb_sectors(struct imsm_super *mpb)
+{
+	__u32 size = __le32_to_cpu(mpb->mpb_size);
+
+	return ((size + (512-1)) & (~(512-1))) / 512;
+}
+
+/* internal representation of IMSM metadata */
+struct intel_super {
+	union {
+		struct imsm_super *mpb;
+		void *buf;
+	};
+	struct dl {
+		struct dl *next;
+		int index;
+		__u8 serial[MAX_RAID_SERIAL_LEN];
+		int major, minor;
+		char *devname;
+		int fd;
+	} *disks;
+};
+
+static struct supertype *match_metadata_desc_imsm(char *arg)
+{
+	struct supertype *st;
+
+	if (strcmp(arg, "imsm") != 0 &&
+	    strcmp(arg, "default") != 0
+		)
+		return NULL;
+
+	st = malloc(sizeof(*st));
+	st->ss = &super_imsm;
+	st->max_devs = IMSM_MAX_DEVICES;
+	st->minor_version = 0;
+	st->sb = NULL;
+	return st;
+}
+
+static struct supertype *match_metadata_desc_imsm_raid(char *arg)
+{
+	struct supertype *st;
+
+	if (strcmp(arg, "imsm/raid") != 0 &&
+	    strcmp(arg, "raid") != 0 &&
+	    strcmp(arg, "default") != 0
+		)
+		return NULL;
+
+	st = malloc(sizeof(*st));
+	st->ss = &super_imsm_raid;
+	st->max_devs = IMSM_MAX_DEVICES;
+	st->minor_version = 0;
+	st->sb = NULL;
+	return st;
+}
+
+static __u8 *get_imsm_version(struct imsm_super *mpb)
+{
+	return &mpb->sig[MPB_SIG_LEN];
+}
+
+static struct imsm_disk *get_imsm_disk(struct imsm_super *mpb, __u8 index)
+{
+	if (index > mpb->num_disks - 1)
+		return NULL;
+	return &mpb->disk[index];
+}
+
+static __u32 gen_imsm_checksum(struct imsm_super *mpb)
+{
+	__u32 end = mpb->mpb_size / sizeof(end);
+	__u32 *p = (__u32 *) mpb;
+	__u32 sum = 0;
+
+        while (end--)
+                sum += __le32_to_cpu(*p++);
+
+        return sum - __le32_to_cpu(mpb->check_sum);
+}
+
+static size_t sizeof_imsm_dev(struct imsm_dev *dev)
+{
+	size_t size = sizeof(*dev);
+
+	/* each map has disk_ord_tbl[num_members - 1] additional space */
+	size += sizeof(__u32) * (dev->vol.map[0].num_members - 1);
+
+	/* migrating means an additional map */
+	if (dev->vol.migr_state) {
+		size += sizeof(struct imsm_map);
+		size += sizeof(__u32) * (dev->vol.map[1].num_members - 1);
+	}
+
+	return size;
+}
+
+static struct imsm_dev *get_imsm_dev(struct imsm_super *mpb, __u8 index)
+{
+	int offset;
+	int i;
+	void *_mpb = mpb;
+
+	if (index > mpb->num_raid_devs - 1)
+		return NULL;
+
+	/* devices start after all disks */
+	offset = ((void *) &mpb->disk[mpb->num_disks]) - _mpb;
+
+	for (i = 0; i <= index; i++)
+		if (i == index)
+			return _mpb + offset;
+		else
+			offset += sizeof_imsm_dev(_mpb + offset);
+
+	return NULL;
+}
+
+static __u32 get_imsm_disk_idx(struct imsm_map *map, int slot)
+{
+	__u32 *ord_tbl = &map->disk_ord_tbl[slot];
+
+	/* top byte is 'special' */
+	return __le32_to_cpu(*ord_tbl & ~(0xff << 24));
+}
+
+#ifndef MDASSEMBLE
+static int get_imsm_raid_level(struct imsm_map *map)
+{
+	if (map->raid_level == 1) {
+		if (map->num_members == 2)
+			return 1;
+		else
+			return 10;
+	}
+
+	return map->raid_level;
+}
+
+static void print_imsm_dev(struct imsm_dev *dev, int index)
+{
+	__u64 sz;
+	int slot;
+	struct imsm_map *map = dev->vol.map;
+
+	printf("\n");
+	printf("[%s]:\n", dev->volume);
+	printf("     RAID Level : %d\n", get_imsm_raid_level(map));
+	printf("        Members : %d\n", map->num_members);
+	for (slot = 0; slot < map->num_members; slot++)
+		if (index == get_imsm_disk_idx(map, slot))
+			break;
+	if (slot < map->num_members)
+		printf("      This Slot : %d\n", slot);
+	else
+		printf("      This Slot : ?\n");
+	sz = __le32_to_cpu(dev->size_high);
+	sz <<= 32;
+	sz += __le32_to_cpu(dev->size_low);
+	printf("     Array Size : %llu%s\n", (unsigned long long)sz,
+	       human_size(sz * 512));
+	sz = __le32_to_cpu(map->blocks_per_member);
+	printf("   Per Dev Size : %llu%s\n", (unsigned long long)sz,
+	       human_size(sz * 512));
+	printf("  Sector Offset : %u\n",
+		__le32_to_cpu(map->pba_of_lba0));
+	printf("    Num Stripes : %u\n",
+		__le32_to_cpu(map->num_data_stripes));
+	printf("     Chunk Size : %u KiB\n",
+		__le16_to_cpu(map->blocks_per_strip) / 2);
+	printf("       Reserved : %d\n", __le32_to_cpu(dev->reserved_blocks));
+	printf("  Migrate State : %s\n", dev->vol.migr_state ? "migrating" : "idle");
+	printf("    Dirty State : %s\n", dev->vol.dirty ? "dirty" : "clean");
+	printf("      Map State : %s\n", map_state_str[map->map_state]);
+}
+
+static void print_imsm_disk(struct imsm_super *mpb, int index)
+{
+	struct imsm_disk *disk = get_imsm_disk(mpb, index);
+	char str[MAX_RAID_SERIAL_LEN];
+	__u32 s;
+	__u64 sz;
+
+	printf("\n");
+	snprintf(str, MAX_RAID_SERIAL_LEN, "%s", disk->serial);
+	printf("  Disk%02d Serial : %s\n", index, str);
+	s = __le32_to_cpu(disk->status);
+	printf("          State :%s%s%s%s\n", s&SPARE_DISK ? " spare" : "",
+					      s&CONFIGURED_DISK ? " active" : "",
+					      s&FAILED_DISK ? " failed" : "",
+					      s&USABLE_DISK ? " usable" : "");
+	printf("             Id : %08x\n", __le32_to_cpu(disk->scsi_id));
+	sz = __le32_to_cpu(disk->total_blocks) - mpb_sectors(mpb);
+	printf("    Usable Size : %llu%s\n", (unsigned long long)sz,
+	       human_size(sz * 512));
+}
+
+static void examine_super_imsm(struct supertype *st, char *homehost)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->mpb;
+	char str[MAX_SIGNATURE_LENGTH];
+	int i;
+	__u32 sum;
+
+	snprintf(str, MPB_SIG_LEN, "%s", mpb->sig);
+	printf("          Magic : %s\n", str);
+	snprintf(str, strlen(MPB_VERSION_RAID0), "%s", get_imsm_version(mpb));
+	printf("        Version : %s\n", get_imsm_version(mpb));
+	printf("         Family : %08x\n", __le32_to_cpu(mpb->family_num));
+	printf("     Generation : %08x\n", __le32_to_cpu(mpb->generation_num));
+	sum = __le32_to_cpu(mpb->check_sum);
+	printf("       Checksum : %08x %s\n", sum,
+		gen_imsm_checksum(mpb) == sum ? "correct" : "incorrect");
+	printf("          Disks : %d\n", mpb->num_disks);
+	printf("   RAID Devices : %d\n", mpb->num_raid_devs);
+	print_imsm_disk(mpb, super->disks->index);
+	for (i = 0; i < mpb->num_raid_devs; i++)
+		print_imsm_dev(get_imsm_dev(mpb, i), super->disks->index);
+	for (i = 0; i < mpb->num_disks; i++) {
+		if (i == super->disks->index)
+			continue;
+		print_imsm_disk(mpb, i);
+	}
+}
+
+static void brief_examine_super_imsm(struct supertype *st)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->mpb;
+
+	printf("ARRAY /dev/imsm family=%08x metadata=external:imsm\n",
+		__le32_to_cpu(mpb->family_num));
+}
+
+static void detail_super_imsm(struct supertype *st, char *homehost)
+{
+	printf("%s\n", __FUNCTION__);
+}
+
+static void brief_detail_super_imsm(struct supertype *st)
+{
+	printf("%s\n", __FUNCTION__);
+}
+#endif
+
+static int match_home_imsm(struct supertype *st, char *homehost)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static void uuid_from_super_imsm(struct supertype *st, int uuid[4])
+{
+	printf("%s\n", __FUNCTION__);
+}
+
+static void getinfo_super_imsm(struct supertype *st, struct mdinfo *info)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->mpb;
+	struct imsm_disk *disk;
+	__u32 s;
+	__u8 *v = get_imsm_version(mpb);
+	__u8 *end = mpb->sig + MAX_SIGNATURE_LENGTH;
+	char major[] = { 0, 0, 0 };
+	char minor[] = { 0 ,0, 0 };
+	char patch[] = { 0, 0, 0 };
+	char *ver_parse[] = { major, minor, patch };
+	int i, j;
+
+	i = j = 0;
+	while (*v != '\0' && v < end) {
+		if (*v != '.' && j < 2)
+			ver_parse[i][j++] = *v;
+		else {
+			i++;
+			j = 0;
+		}
+		v++;
+	}
+
+	info->array.major_version = 2000;
+	info->array.minor_version = strtol(minor, NULL, 0);
+	info->array.patch_version = strtol(patch, NULL, 0);
+	info->array.raid_disks    = mpb->num_disks;
+	info->array.level         = LEVEL_CONTAINER;
+	info->array.layout        = 0;
+	info->array.md_minor      = -1;
+	info->array.ctime         = __le32_to_cpu(mpb->generation_num); //??
+	info->array.utime         = 0;
+	info->array.chunk_size    = 0;
+
+	info->disk.major = 0;
+	info->disk.minor = 0;
+	info->disk.number = super->disks->index;
+	info->disk.raid_disk = -1;
+	/* is this disk a member of a raid device? */
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev = get_imsm_dev(mpb, i);
+		struct imsm_map *map = dev->vol.map;
+
+		for (j = 0; j < map->num_members; j++) {
+			__u32 index = get_imsm_disk_idx(map, j);
+
+			if (index == super->disks->index) {
+				info->disk.raid_disk = super->disks->index;
+				break;
+			}
+		}
+		if (info->disk.raid_disk != -1)
+			break;
+	}
+	disk = get_imsm_disk(mpb, super->disks->index);
+	s = __le32_to_cpu(disk->status);
+	info->disk.state  = s & CONFIGURED_DISK ? (1 << MD_DISK_ACTIVE) : 0;
+	info->disk.state |= s & FAILED_DISK ? (1 << MD_DISK_FAULTY) : 0;
+	info->disk.state |= s & USABLE_DISK ? (1 << MD_DISK_SYNC) : 0;
+	info->reshape_active = 0;
+}
+
+static void getinfo_super_imsm_raid(struct supertype *st, struct mdinfo *info)
+{
+	printf("%s\n", __FUNCTION__);
+}
+
+static int update_super_imsm(struct supertype *st, struct mdinfo *info,
+			     char *update, char *devname, int verbose,
+			     int uuid_set, char *homehost)
+{
+	return 0;
+}
+
+static __u64 avail_size_imsm(struct supertype *st, __u64 size)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static int compare_super_imsm(struct supertype *st, struct supertype *tst)
+{
+	/*
+	 * return:
+	 *  0 same, or first was empty, and second was copied
+	 *  1 second had wrong number
+	 *  2 wrong uuid
+	 *  3 wrong other info
+	 */
+	struct intel_super *first = st->sb;
+	struct intel_super *sec = tst->sb;
+
+        if (!first) {
+                st->sb = tst->sb;
+                tst->sb = NULL;
+                return 0;
+        }
+
+	if (memcmp(first->mpb->sig, sec->mpb->sig, MAX_SIGNATURE_LENGTH) != 0)
+		return 3;
+	if (first->mpb->family_num != sec->mpb->family_num)
+		return 3;
+	if (first->mpb->mpb_size != sec->mpb->mpb_size)
+		return 3;
+	if (first->mpb->check_sum != sec->mpb->check_sum)
+		return 3;
+
+	return 0;
+}
+
+extern int scsi_get_serial(int fd, void *buf, size_t buf_len);
+
+static int imsm_read_serial(int fd, char *devname,
+			    __u8 serial[MAX_RAID_SERIAL_LEN])
+{
+	unsigned char scsi_serial[255];
+	struct stat stb;
+	int sg_fd;
+	int minor;
+	char sg_path[20];
+	int rv;
+	int rsp_len;
+	int i, cnt;
+
+	memset(scsi_serial, 0, sizeof(scsi_serial));
+	fstat(fd, &stb);
+	minor = minor(stb.st_rdev);
+	minor /= 16;
+
+	sprintf(sg_path, "/dev/sg%d", minor);
+	sg_fd = open(sg_path, O_RDONLY);
+	if (sg_fd < 0) {
+		if (devname)
+			fprintf(stderr,
+				Name ": Failed to open %s for %s: %s\n",
+				sg_path,  devname, strerror(errno));
+		return 1;
+	}
+
+	rv = scsi_get_serial(sg_fd, scsi_serial, sizeof(scsi_serial));
+	close(sg_fd);
+
+	if (rv != 0) {
+		if (devname)
+			fprintf(stderr,
+				Name ": Failed to retrieve serial for %s\n",
+				devname);
+		return rv;
+	}
+
+	rsp_len = scsi_serial[3];
+	for (i = 0, cnt = 0; i < rsp_len; i++) {
+		if (!isspace(scsi_serial[4 + i]))
+			serial[cnt++] = scsi_serial[4 + i];
+		if (cnt == MAX_RAID_SERIAL_LEN)
+			break;
+	}
+
+	serial[MAX_RAID_SERIAL_LEN - 1] = '\0';
+
+	return 0;
+}
+
+static int
+load_imsm_disk(int fd, struct intel_super *super, char *devname, int keep_fd)
+{
+	struct imsm_super *mpb = super->mpb;
+	struct dl *dl;
+	struct stat stb;
+	struct imsm_disk *disk;
+	int rv;
+	int i;
+
+	dl = malloc(sizeof(*dl));
+	if (!dl) {
+		if (devname)
+			fprintf(stderr,
+				Name ": failed to allocate disk buffer for %s\n",
+				devname);
+		return 2;
+	}
+	memset(dl, 0, sizeof(*dl));
+
+	fstat(fd, &stb);
+	dl->major = major(stb.st_rdev);
+	dl->minor = minor(stb.st_rdev);
+	dl->next = super->disks;
+	dl->fd = keep_fd ? fd : -1;
+	dl->devname = devname ? strdup(devname) : NULL;
+	dl->index = -1;
+	super->disks = dl;
+	rv = imsm_read_serial(fd, devname, dl->serial);
+
+	if (rv != 0)
+		return 2;
+
+	/* look up this disk's index */
+	for (i = 0; i < mpb->num_disks; i++) {
+		disk = get_imsm_disk(mpb, i);
+
+		if (memcmp(disk->serial, dl->serial, MAX_RAID_SERIAL_LEN) == 0)
+			break;
+	}
+
+	if (i > mpb->num_disks)
+		return 2;
+
+	dl->index = i;
+
+	return 0;
+}
+
+/* load_imsm_mpb - read matrix metadata
+ * allocates super->mpb to be freed by free_super
+ */
+static int load_imsm_mpb(int fd, struct intel_super *super, char *devname)
+{
+	unsigned long long dsize;
+	size_t len, mpb_size;
+	unsigned long long sectors;
+	struct stat;
+	struct imsm_super anchor;
+	__u32 check_sum;
+
+	memset(super, 0, sizeof(*super));
+	get_dev_size(fd, NULL, &dsize);
+
+	if (lseek64(fd, dsize - (512 * 2), SEEK_SET) < 0) {
+		if (devname)
+			fprintf(stderr,
+				Name ": Cannot seek to anchor block on %s: %s\n",
+				devname, strerror(errno));
+		return 1;
+	}
+
+	len = sizeof(anchor);
+	if (read(fd, &anchor, len) != len) {
+		if (devname)
+			fprintf(stderr,
+				Name ": Cannot read anchor block on %s: %s\n",
+				devname, strerror(errno));
+		return 1;
+	}
+
+	if (strncmp((char *) anchor.sig, MPB_SIGNATURE, MPB_SIG_LEN) != 0) {
+		if (devname)
+			fprintf(stderr,
+				Name ": no IMSM anchor on %s\n", devname);
+		return 2;
+	}
+
+	mpb_size = __le32_to_cpu(anchor.mpb_size);
+	super->mpb = malloc(mpb_size < 512 ? 512 : mpb_size);
+	if (!super->mpb) {
+		if (devname)
+			fprintf(stderr,
+				Name ": unable to allocate %zu byte mpb buffer\n",
+				mpb_size);
+		return 2;
+	}
+	memcpy(super->buf, &anchor, sizeof(anchor));
+
+	/* read the rest of the first block */
+	len = 512 - sizeof(anchor);
+	if (read(fd, super->buf + sizeof(anchor), len) != len) {
+		if (devname)
+			fprintf(stderr,
+				Name ": Cannot read anchor remainder on %s: %s\n",
+				devname, strerror(errno));
+		return 2;
+	}
+
+	sectors = mpb_sectors(&anchor) - 1;
+	if (!sectors)
+		return load_imsm_disk(fd, super, devname, 0);
+
+	/* read the extended mpb */
+	if (lseek64(fd, dsize - (512 * (2 + sectors)), SEEK_SET) < 0) {
+		if (devname)
+			fprintf(stderr,
+				Name ": Cannot seek to extended mpb on %s: %s\n",
+				devname, strerror(errno));
+		return 1;
+	}
+
+	len = mpb_size - 512;
+	if (read(fd, super->buf + 512, len) != len) {
+		if (devname)
+			fprintf(stderr,
+				Name ": Cannot read extended mpb on %s: %s\n",
+				devname, strerror(errno));
+		return 2;
+	}
+
+	check_sum = gen_imsm_checksum(super->mpb);
+	if (check_sum != __le32_to_cpu(super->mpb->check_sum)) {
+		if (devname)
+			fprintf(stderr,
+				Name ": IMSM checksum %x != %x on %s\n",
+				check_sum, __le32_to_cpu(super->mpb->check_sum),
+				devname);
+		return 2;
+	}
+
+	return load_imsm_disk(fd, super, devname, 0);
+}
+
+struct superswitch super_imsm_container;
+
+static void free_imsm_disks(struct intel_super *super)
+{
+	while (super->disks) {
+		struct dl *d = super->disks;
+
+		super->disks = d->next;
+		if (d->fd >= 0)
+			close(d->fd);
+		if (d->devname)
+			free(d->devname);
+		free(d);
+	}
+}
+
+static void free_imsm(struct intel_super *super)
+{
+	if (super->mpb)
+		free(super->mpb);
+	free_imsm_disks(super);
+	free(super);
+}
+
+
+static void free_super_imsm(struct supertype *st)
+{
+	struct intel_super *super = st->sb;
+
+	if (!super)
+		return;
+
+	free_imsm(super);
+	st->sb = NULL;
+}
+
+#ifndef MDASSEMBLE
+static int load_super_imsm_all(struct supertype *st, int fd, void **sbp,
+			       char *devname, int keep_fd)
+{
+	struct mdinfo *sra;
+	struct intel_super *super;
+	struct mdinfo *sd, *best = NULL;
+	__u32 bestgen = 0;
+	__u32 gen;
+	char nm[20];
+	int dfd;
+	int rv;
+
+	/* check if this disk is a member of an active array */
+	sra = sysfs_read(fd, 0, GET_LEVEL|GET_VERSION|GET_DEVS|GET_STATE);
+	if (!sra)
+		return 1;
+
+	if (sra->array.major_version != -1 ||
+	    sra->array.minor_version != -2 ||
+	    strcmp(sra->text_version, "imsm") != 0)
+		return 1;
+
+	super = malloc(sizeof(*super));
+	if (!super)
+		return 1;
+
+	/* find the most up to date disk in this array */
+	for (sd = sra->devs; sd; sd = sd->next) {
+		sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor);
+		dfd = dev_open(nm, keep_fd ? O_RDWR : O_RDONLY);
+		if (!dfd) {
+			free_imsm(super);
+			return 2;
+		}
+		rv = load_imsm_mpb(dfd, super, NULL);
+		if (!keep_fd)
+			close(dfd);
+		if (rv == 0) {
+			gen = __le32_to_cpu(super->mpb->generation_num);
+			if (!best || gen > bestgen) {
+				bestgen = gen;
+				best = sd;
+			}
+		} else {
+			free_imsm(super);
+			return 2;
+		}
+	}
+
+	if (!best) {
+		free_imsm(super);
+		return 1;
+	}
+
+	/* load the most up to date anchor */
+	sprintf(nm, "%d:%d", best->disk.major, best->disk.minor);
+	dfd = dev_open(nm, O_RDONLY);
+	if (!dfd) {
+		free_imsm(super);
+		return 1;
+	}
+	rv = load_imsm_mpb(dfd, super, NULL);
+	close(dfd);
+	if (rv != 0) {
+		free_imsm(super);
+		return 2;
+	}
+
+	/* reset the disk list */
+	free_imsm_disks(super);
+
+	/* populate disk list */
+	for (sd = sra->devs ; sd ; sd = sd->next) {
+		sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor);
+		dfd = dev_open(nm, keep_fd? O_RDWR : O_RDONLY);
+		if (!dfd) {
+			free_imsm(super);
+			return 2;
+		}
+		load_imsm_disk(dfd, super, NULL, keep_fd);
+		if (!keep_fd)
+			close(dfd);
+	}
+
+	*sbp = super;
+	if (st->ss == NULL) {
+		st->ss = &super_imsm_container;
+		st->minor_version = 0;
+		st->max_devs = IMSM_MAX_DEVICES;
+	}
+
+	return 0;
+}
+#endif
+
+static int load_super_imsm(struct supertype *st, int fd, char *devname)
+{
+	struct intel_super *super;
+	int rv;
+
+#ifndef MDASSEMBLE
+	if (load_super_imsm_all(st, fd, &st->sb, devname, 0) == 0)
+		return 0;
+#endif
+
+	super = malloc(sizeof(*super));
+	if (!super) {
+		fprintf(stderr,
+			Name ": malloc of %zu failed.\n",
+			sizeof(*super));
+		return 1;
+	}
+
+	rv = load_imsm_mpb(fd, super, devname);
+
+	if (rv) {
+		if (devname)
+			fprintf(stderr,
+				Name ": Failed to load all information "
+				"sections on %s\n", devname);
+		free_imsm(super);
+		return rv;
+	}
+
+	st->sb = super;
+	if (st->ss == NULL) {
+		st->ss = &super_imsm;
+		st->minor_version = 0;
+		st->max_devs = IMSM_MAX_DEVICES;
+	}
+
+	return 0;
+}
+
+static int init_zero_imsm(struct supertype *st, mdu_array_info_t *info,
+			  unsigned long long size, char *name,
+			  char *homehost, int *uuid)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static int init_super_imsm(struct supertype *st, mdu_array_info_t *info,
+			   unsigned long long size, char *name,
+			   char *homehost, int *uuid)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static int init_super_imsm_raid(struct supertype *st, mdu_array_info_t *info,
+				unsigned long long size, char *name,
+				char *homehost, int *uuid)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static void add_to_super_imsm(struct supertype *st, mdu_disk_info_t *dinfo,
+			      int fd, char *devname)
+{
+	printf("%s\n", __FUNCTION__);
+}
+
+static void add_to_super_imsm_raid(struct supertype *st, mdu_disk_info_t *dinfo,
+				   int fd, char *devname)
+{
+	printf("%s\n", __FUNCTION__);
+}
+
+static int write_init_super_imsm(struct supertype *st)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static int store_zero_imsm(struct supertype *st, int fd)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static void getinfo_super_n_container(struct supertype *st, struct mdinfo *info)
+{
+	printf("%s\n", __FUNCTION__);
+}
+
+static void getinfo_super_n_raid(struct supertype *st, struct mdinfo *info)
+{
+	printf("%s\n", __FUNCTION__);
+}
+
+static int validate_geometry_imsm(struct supertype *st, int level, int layout,
+				  int raiddisks, int chunk, unsigned long long size,
+				  char *subdev, unsigned long long *freesize)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static int validate_geometry_imsm_container(struct supertype *st, int level,
+					    int layout, int raiddisks, int chunk,
+					    unsigned long long size, char *subdev,
+					    unsigned long long *freesize)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+static int validate_geometry_imsm_raid(struct supertype *st, int level,
+				       int layout, int raiddisks, int chunk,
+				       unsigned long long size, char *subdev,
+				       unsigned long long *freesize)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return 0;
+}
+
+
+
+static struct mdinfo *container_content_imsm(struct supertype *st)
+{
+	printf("%s\n", __FUNCTION__);
+
+	return NULL;
+}
+
+struct superswitch super_imsm = {
+#ifndef	MDASSEMBLE
+	.examine_super	= examine_super_imsm,
+	.brief_examine_super = brief_examine_super_imsm,
+	.detail_super	= detail_super_imsm,
+	.brief_detail_super = brief_detail_super_imsm,
+#endif
+	.match_home	= match_home_imsm,
+	.uuid_from_super= uuid_from_super_imsm,
+	.getinfo_super  = getinfo_super_imsm,
+	.update_super	= update_super_imsm,
+
+	.avail_size	= avail_size_imsm,
+
+	.compare_super	= compare_super_imsm,
+
+	.load_super	= load_super_imsm,
+	.init_super	= init_zero_imsm,
+	.store_super	= store_zero_imsm,
+	.free_super	= free_super_imsm,
+	.match_metadata_desc = match_metadata_desc_imsm,
+	.getinfo_super_n  = getinfo_super_n_container,
+
+	.validate_geometry = validate_geometry_imsm,
+	.major		= 2000,
+	.swapuuid	= 0,
+	.external	= 1,
+	.text_version	= "imsm",
+};
+
+/* super_imsm_container is set by validate_geometry_imsm when given a
+ * device that is not part of any array
+ */
+struct superswitch super_imsm_container = {
+
+	.validate_geometry = validate_geometry_imsm_container,
+	.init_super	= init_super_imsm,
+	.add_to_super	= add_to_super_imsm,
+	.write_init_super = write_init_super_imsm,
+	.getinfo_super  = getinfo_super_imsm,
+	.getinfo_super_n  = getinfo_super_n_container,
+	.load_super	= load_super_imsm,
+
+#ifndef MDASSEMBLE
+	.examine_super	= examine_super_imsm,
+	.brief_examine_super = brief_examine_super_imsm,
+	.detail_super	= detail_super_imsm,
+	.brief_detail_super = brief_detail_super_imsm,
+#endif
+
+	.free_super	= free_super_imsm,
+
+	.container_content = container_content_imsm,
+
+	.major		= 2000,
+	.swapuuid	= 0,
+	.external	= 1,
+	.text_version	= "imsm",
+};
+
+struct superswitch super_imsm_raid = {
+	.update_super	= update_super_imsm,
+	.init_super	= init_super_imsm_raid,
+	.add_to_super	= add_to_super_imsm_raid,
+	.getinfo_super  = getinfo_super_imsm_raid,
+	.getinfo_super_n  = getinfo_super_n_raid,
+	.write_init_super = write_init_super_imsm,
+
+	.load_super	= load_super_imsm,
+	.free_super	= free_super_imsm,
+	.match_metadata_desc = match_metadata_desc_imsm_raid,
+
+
+	.validate_geometry = validate_geometry_imsm_raid,
+	.major		= 2001,
+	.swapuuid	= 0,
+	.external	= 2,
+	.text_version	= "imsm",
+};
diff --git a/util.c b/util.c
index 8ea30699..4acb367f 100644
--- a/util.c
+++ b/util.c
@@ -780,7 +780,7 @@ int dev_open(char *dev, int flags)
 	return fd;
 }
 
-struct superswitch *superlist[] = { &super0, &super1, &super_ddf, NULL };
+struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
 
 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
 struct supertype *super_by_fd(int fd)