Adding upstream version 4.2.upstream/4.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 12894 insertions, 0 deletions

diff --git a/super-intel.c b/super-intel.c
new file mode 100644
index 0000000..d5fad10
--- /dev/null
+++ b/super-intel.c
@@ -0,0 +1,12894 @@
+/*
+ * mdadm - Intel(R) Matrix Storage Manager Support
+ *
+ * Copyright (C) 2002-2008 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.
+ */
+
+#define HAVE_STDINT_H 1
+#include "mdadm.h"
+#include "mdmon.h"
+#include "sha1.h"
+#include "platform-intel.h"
+#include <values.h>
+#include <scsi/sg.h>
+#include <ctype.h>
+#include <dirent.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_MANY_VOLUMES_PER_ARRAY "1.2.00"
+#define MPB_VERSION_3OR4_DISK_ARRAY "1.2.01"
+#define MPB_VERSION_RAID5 "1.2.02"
+#define MPB_VERSION_5OR6_DISK_ARRAY "1.2.04"
+#define MPB_VERSION_CNG "1.2.06"
+#define MPB_VERSION_ATTRIBS "1.3.00"
+#define MAX_SIGNATURE_LENGTH  32
+#define MAX_RAID_SERIAL_LEN   16
+
+/* supports RAID0 */
+#define MPB_ATTRIB_RAID0		__cpu_to_le32(0x00000001)
+/* supports RAID1 */
+#define MPB_ATTRIB_RAID1		__cpu_to_le32(0x00000002)
+/* supports RAID10 */
+#define MPB_ATTRIB_RAID10		__cpu_to_le32(0x00000004)
+/* supports RAID1E */
+#define MPB_ATTRIB_RAID1E		__cpu_to_le32(0x00000008)
+/* supports RAID5 */
+#define MPB_ATTRIB_RAID5		__cpu_to_le32(0x00000010)
+/* supports RAID CNG */
+#define MPB_ATTRIB_RAIDCNG		__cpu_to_le32(0x00000020)
+/* supports expanded stripe sizes of  256K, 512K and 1MB */
+#define MPB_ATTRIB_EXP_STRIPE_SIZE	__cpu_to_le32(0x00000040)
+
+/* The OROM Support RST Caching of Volumes */
+#define MPB_ATTRIB_NVM			__cpu_to_le32(0x02000000)
+/* The OROM supports creating disks greater than 2TB */
+#define MPB_ATTRIB_2TB_DISK		__cpu_to_le32(0x04000000)
+/* The OROM supports Bad Block Management */
+#define MPB_ATTRIB_BBM			__cpu_to_le32(0x08000000)
+
+/* THe OROM Supports NVM Caching of Volumes */
+#define MPB_ATTRIB_NEVER_USE2           __cpu_to_le32(0x10000000)
+/* The OROM supports creating volumes greater than 2TB */
+#define MPB_ATTRIB_2TB			__cpu_to_le32(0x20000000)
+/* originally for PMP, now it's wasted b/c. Never use this bit! */
+#define MPB_ATTRIB_NEVER_USE		__cpu_to_le32(0x40000000)
+/* Verify MPB contents against checksum after reading MPB */
+#define MPB_ATTRIB_CHECKSUM_VERIFY	__cpu_to_le32(0x80000000)
+
+/* Define all supported attributes that have to be accepted by mdadm
+ */
+#define MPB_ATTRIB_SUPPORTED	       (MPB_ATTRIB_CHECKSUM_VERIFY | \
+					MPB_ATTRIB_2TB             | \
+					MPB_ATTRIB_2TB_DISK        | \
+					MPB_ATTRIB_RAID0           | \
+					MPB_ATTRIB_RAID1           | \
+					MPB_ATTRIB_RAID10          | \
+					MPB_ATTRIB_RAID5           | \
+					MPB_ATTRIB_EXP_STRIPE_SIZE | \
+					MPB_ATTRIB_BBM)
+
+/* Define attributes that are unused but not harmful */
+#define MPB_ATTRIB_IGNORED		(MPB_ATTRIB_NEVER_USE)
+
+#define MPB_SECTOR_CNT 2210
+#define IMSM_RESERVED_SECTORS 8192
+#define NUM_BLOCKS_DIRTY_STRIPE_REGION 2048
+#define SECT_PER_MB_SHIFT 11
+#define MAX_SECTOR_SIZE 4096
+#define MULTIPLE_PPL_AREA_SIZE_IMSM (1024 * 1024) /* Size of the whole
+						   * mutliple PPL area
+						   */
+
+/*
+ * Internal Write-intent bitmap is stored in the same area where PPL.
+ * Both features are mutually exclusive, so it is not an issue.
+ * The first 8KiB of the area are reserved and shall not be used.
+ */
+#define IMSM_BITMAP_AREA_RESERVED_SIZE 8192
+
+#define IMSM_BITMAP_HEADER_OFFSET (IMSM_BITMAP_AREA_RESERVED_SIZE)
+#define IMSM_BITMAP_HEADER_SIZE MAX_SECTOR_SIZE
+
+#define IMSM_BITMAP_START_OFFSET (IMSM_BITMAP_HEADER_OFFSET + IMSM_BITMAP_HEADER_SIZE)
+#define IMSM_BITMAP_AREA_SIZE (MULTIPLE_PPL_AREA_SIZE_IMSM - IMSM_BITMAP_START_OFFSET)
+#define IMSM_BITMAP_AND_HEADER_SIZE (IMSM_BITMAP_AREA_SIZE + IMSM_BITMAP_HEADER_SIZE)
+
+#define IMSM_DEFAULT_BITMAP_CHUNKSIZE (64 * 1024 * 1024)
+#define IMSM_DEFAULT_BITMAP_DAEMON_SLEEP 5
+
+/*
+ * This macro let's us ensure that no-one accidentally
+ * changes the size of a struct
+ */
+#define ASSERT_SIZE(_struct, size) \
+static inline void __assert_size_##_struct(void)	\
+{							\
+	switch (0) {					\
+	case 0: break;					\
+	case (sizeof(struct _struct) == size): break;	\
+	}						\
+}
+
+/* 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_lo;		 /* 0xE8 - 0xEB total blocks lo */
+	__u32 scsi_id;			 /* 0xEC - 0xEF scsi ID */
+#define SPARE_DISK      __cpu_to_le32(0x01)  /* Spare */
+#define CONFIGURED_DISK __cpu_to_le32(0x02)  /* Member of some RaidDev */
+#define FAILED_DISK     __cpu_to_le32(0x04)  /* Permanent failure */
+#define JOURNAL_DISK    __cpu_to_le32(0x2000000) /* Device marked as Journaling Drive */
+	__u32 status;			 /* 0xF0 - 0xF3 */
+	__u32 owner_cfg_num; /* which config 0,1,2... owns this disk */
+	__u32 total_blocks_hi;		 /* 0xF4 - 0xF5 total blocks hi */
+#define	IMSM_DISK_FILLERS	3
+	__u32 filler[IMSM_DISK_FILLERS]; /* 0xF5 - 0x107 MPB_DISK_FILLERS for future expansion */
+};
+ASSERT_SIZE(imsm_disk, 48)
+
+/* map selector for map managment
+ */
+#define MAP_0		0
+#define MAP_1		1
+#define MAP_X		-1
+
+/* RAID map configuration infos. */
+struct imsm_map {
+	__u32 pba_of_lba0_lo;	/* start address of partition */
+	__u32 blocks_per_member_lo;/* blocks per member */
+	__u32 num_data_stripes_lo;	/* 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
+#define IMSM_T_STATE_FAILED 3
+	__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  num_domains;	/* number of parity domains */
+	__u8  failed_disk_num;  /* valid only when state is degraded */
+	__u8  ddf;
+	__u32 pba_of_lba0_hi;
+	__u32 blocks_per_member_hi;
+	__u32 num_data_stripes_hi;
+	__u32 filler[4];	/* expansion area */
+#define IMSM_ORD_REBUILD (1 << 24)
+	__u32 disk_ord_tbl[1];	/* disk_ord_tbl[num_members],
+				 * top byte contains some flags
+				 */
+};
+ASSERT_SIZE(imsm_map, 52)
+
+struct imsm_vol {
+	__u32 curr_migr_unit_lo;
+	__u32 checkpoint_id;	/* id to access curr_migr_unit */
+	__u8  migr_state;	/* Normal or Migrating */
+#define MIGR_INIT 0
+#define MIGR_REBUILD 1
+#define MIGR_VERIFY 2 /* analagous to echo check > sync_action */
+#define MIGR_GEN_MIGR 3
+#define MIGR_STATE_CHANGE 4
+#define MIGR_REPAIR 5
+	__u8  migr_type;	/* Initializing, Rebuilding, ... */
+#define RAIDVOL_CLEAN          0
+#define RAIDVOL_DIRTY          1
+#define RAIDVOL_DSRECORD_VALID 2
+	__u8  dirty;
+	__u8  fs_state;		/* fast-sync state for CnG (0xff == disabled) */
+	__u16 verify_errors;	/* number of mismatches */
+	__u16 bad_blocks;	/* number of bad blocks during verify */
+	__u32 curr_migr_unit_hi;
+	__u32 filler[3];
+	struct imsm_map map[1];
+	/* here comes another one if migr_state */
+};
+ASSERT_SIZE(imsm_vol, 84)
+
+struct imsm_dev {
+	__u8  volume[MAX_RAID_SERIAL_LEN];
+	__u32 size_low;
+	__u32 size_high;
+#define DEV_BOOTABLE		__cpu_to_le32(0x01)
+#define DEV_BOOT_DEVICE		__cpu_to_le32(0x02)
+#define DEV_READ_COALESCING	__cpu_to_le32(0x04)
+#define DEV_WRITE_COALESCING	__cpu_to_le32(0x08)
+#define DEV_LAST_SHUTDOWN_DIRTY	__cpu_to_le32(0x10)
+#define DEV_HIDDEN_AT_BOOT	__cpu_to_le32(0x20)
+#define DEV_CURRENTLY_HIDDEN	__cpu_to_le32(0x40)
+#define DEV_VERIFY_AND_FIX	__cpu_to_le32(0x80)
+#define DEV_MAP_STATE_UNINIT	__cpu_to_le32(0x100)
+#define DEV_NO_AUTO_RECOVERY	__cpu_to_le32(0x200)
+#define DEV_CLONE_N_GO		__cpu_to_le32(0x400)
+#define DEV_CLONE_MAN_SYNC	__cpu_to_le32(0x800)
+#define DEV_CNG_MASTER_DISK_NUM	__cpu_to_le32(0x1000)
+	__u32 status;	/* Persistent RaidDev status */
+	__u32 reserved_blocks; /* Reserved blocks at beginning of volume */
+	__u8  migr_priority;
+	__u8  num_sub_vols;
+	__u8  tid;
+	__u8  cng_master_disk;
+	__u16 cache_policy;
+	__u8  cng_state;
+	__u8  cng_sub_state;
+	__u16 my_vol_raid_dev_num; /* Used in Unique volume Id for this RaidDev */
+
+	/* NVM_EN */
+	__u8 nv_cache_mode;
+	__u8 nv_cache_flags;
+
+	/* Unique Volume Id of the NvCache Volume associated with this volume */
+	__u32 nvc_vol_orig_family_num;
+	__u16 nvc_vol_raid_dev_num;
+
+#define RWH_OFF 0
+#define RWH_DISTRIBUTED 1
+#define RWH_JOURNALING_DRIVE 2
+#define RWH_MULTIPLE_DISTRIBUTED 3
+#define RWH_MULTIPLE_PPLS_JOURNALING_DRIVE 4
+#define RWH_MULTIPLE_OFF 5
+#define RWH_BITMAP 6
+	__u8  rwh_policy; /* Raid Write Hole Policy */
+	__u8  jd_serial[MAX_RAID_SERIAL_LEN]; /* Journal Drive serial number */
+	__u8  filler1;
+
+#define IMSM_DEV_FILLERS 3
+	__u32 filler[IMSM_DEV_FILLERS];
+	struct imsm_vol vol;
+};
+ASSERT_SIZE(imsm_dev, 164)
+
+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 error_log_size;		/* 0x30 - 0x33 in bytes */
+	__u32 attributes;		/* 0x34 - 0x37 */
+	__u8 num_disks;			/* 0x38 Number of configured disks */
+	__u8 num_raid_devs;		/* 0x39 Number of configured volumes */
+	__u8 error_log_pos;		/* 0x3A  */
+	__u8 fill[1];			/* 0x3B */
+	__u32 cache_size;		/* 0x3c - 0x40 in mb */
+	__u32 orig_family_num;		/* 0x40 - 0x43 original family num */
+	__u32 pwr_cycle_count;		/* 0x44 - 0x47 simulated power cycle count for array */
+	__u32 bbm_log_size;		/* 0x48 - 0x4B - size of bad Block Mgmt Log in bytes */
+	__u16 num_raid_devs_created;	/* 0x4C - 0x4D Used for generating unique
+					 * volume IDs for raid_dev created in this array
+					 * (starts at 1)
+					 */
+	__u16 filler1;			/* 0x4E - 0x4F */
+	__u64 creation_time;		/* 0x50 - 0x57 Array creation time */
+#define IMSM_FILLERS 32
+	__u32 filler[IMSM_FILLERS];	/* 0x58 - 0xD7 RAID_MPB_FILLERS */
+	struct imsm_disk disk[1];	/* 0xD8 diskTbl[numDisks] */
+	/* here comes imsm_dev[num_raid_devs] */
+	/* here comes BBM logs */
+};
+ASSERT_SIZE(imsm_super, 264)
+
+#define BBM_LOG_MAX_ENTRIES 254
+#define BBM_LOG_MAX_LBA_ENTRY_VAL 256		/* Represents 256 LBAs */
+#define BBM_LOG_SIGNATURE 0xabadb10c
+
+struct bbm_log_block_addr {
+	__u16 w1;
+	__u32 dw1;
+} __attribute__ ((__packed__));
+
+struct bbm_log_entry {
+	__u8 marked_count;		/* Number of blocks marked - 1 */
+	__u8 disk_ordinal;		/* Disk entry within the imsm_super */
+	struct bbm_log_block_addr defective_block_start;
+} __attribute__ ((__packed__));
+
+struct bbm_log {
+	__u32 signature; /* 0xABADB10C */
+	__u32 entry_count;
+	struct bbm_log_entry marked_block_entries[BBM_LOG_MAX_ENTRIES];
+};
+ASSERT_SIZE(bbm_log, 2040)
+
+static char *map_state_str[] = { "normal", "uninitialized", "degraded", "failed" };
+
+#define BLOCKS_PER_KB	(1024/512)
+
+#define RAID_DISK_RESERVED_BLOCKS_IMSM_HI 2209
+
+#define GEN_MIGR_AREA_SIZE 2048 /* General Migration Copy Area size in blocks */
+
+#define MIGR_REC_BUF_SECTORS 1 /* size of migr_record i/o buffer in sectors */
+#define MIGR_REC_SECTOR_POSITION 1 /* migr_record position offset on disk,
+			       * MIGR_REC_BUF_SECTORS <= MIGR_REC_SECTOR_POS
+			       */
+
+#define UNIT_SRC_NORMAL     0   /* Source data for curr_migr_unit must
+				 *  be recovered using srcMap */
+#define UNIT_SRC_IN_CP_AREA 1   /* Source data for curr_migr_unit has
+				 *  already been migrated and must
+				 *  be recovered from checkpoint area */
+
+#define PPL_ENTRY_SPACE (128 * 1024) /* Size of single PPL, without the header */
+
+struct migr_record {
+	__u32 rec_status;	    /* Status used to determine how to restart
+				     * migration in case it aborts
+				     * in some fashion */
+	__u32 curr_migr_unit_lo;    /* 0..numMigrUnits-1 */
+	__u32 family_num;	    /* Family number of MPB
+				     * containing the RaidDev
+				     * that is migrating */
+	__u32 ascending_migr;	    /* True if migrating in increasing
+				     * order of lbas */
+	__u32 blocks_per_unit;      /* Num disk blocks per unit of operation */
+	__u32 dest_depth_per_unit;  /* Num member blocks each destMap
+				     * member disk
+				     * advances per unit-of-operation */
+	__u32 ckpt_area_pba_lo;	    /* Pba of first block of ckpt copy area */
+	__u32 dest_1st_member_lba_lo;	/* First member lba on first
+					 * stripe of destination */
+	__u32 num_migr_units_lo;    /* Total num migration units-of-op */
+	__u32 post_migr_vol_cap;    /* Size of volume after
+				     * migration completes */
+	__u32 post_migr_vol_cap_hi; /* Expansion space for LBA64 */
+	__u32 ckpt_read_disk_num;   /* Which member disk in destSubMap[0] the
+				     * migration ckpt record was read from
+				     * (for recovered migrations) */
+	__u32 curr_migr_unit_hi;    /* 0..numMigrUnits-1 high order 32 bits */
+	__u32 ckpt_area_pba_hi;	    /* Pba of first block of ckpt copy area
+				     * high order 32 bits */
+	__u32 dest_1st_member_lba_hi; /* First member lba on first stripe of
+				       * destination - high order 32 bits */
+	__u32 num_migr_units_hi;      /* Total num migration units-of-op
+				       * high order 32 bits */
+	__u32 filler[16];
+};
+ASSERT_SIZE(migr_record, 128)
+
+struct md_list {
+	/* usage marker:
+	 *  1: load metadata
+	 *  2: metadata does not match
+	 *  4: already checked
+	 */
+	int   used;
+	char  *devname;
+	int   found;
+	int   container;
+	dev_t st_rdev;
+	struct md_list *next;
+};
+
+#define pr_vrb(fmt, arg...) (void) (verbose && pr_err(fmt, ##arg))
+
+static __u8 migr_type(struct imsm_dev *dev)
+{
+	if (dev->vol.migr_type == MIGR_VERIFY &&
+	    dev->status & DEV_VERIFY_AND_FIX)
+		return MIGR_REPAIR;
+	else
+		return dev->vol.migr_type;
+}
+
+static void set_migr_type(struct imsm_dev *dev, __u8 migr_type)
+{
+	/* for compatibility with older oroms convert MIGR_REPAIR, into
+	 * MIGR_VERIFY w/ DEV_VERIFY_AND_FIX status
+	 */
+	if (migr_type == MIGR_REPAIR) {
+		dev->vol.migr_type = MIGR_VERIFY;
+		dev->status |= DEV_VERIFY_AND_FIX;
+	} else {
+		dev->vol.migr_type = migr_type;
+		dev->status &= ~DEV_VERIFY_AND_FIX;
+	}
+}
+
+static unsigned int sector_count(__u32 bytes, unsigned int sector_size)
+{
+	return ROUND_UP(bytes, sector_size) / sector_size;
+}
+
+static unsigned int mpb_sectors(struct imsm_super *mpb,
+					unsigned int sector_size)
+{
+	return sector_count(__le32_to_cpu(mpb->mpb_size), sector_size);
+}
+
+struct intel_dev {
+	struct imsm_dev *dev;
+	struct intel_dev *next;
+	unsigned index;
+};
+
+struct intel_hba {
+	enum sys_dev_type type;
+	char *path;
+	char *pci_id;
+	struct intel_hba *next;
+};
+
+enum action {
+	DISK_REMOVE = 1,
+	DISK_ADD
+};
+/* internal representation of IMSM metadata */
+struct intel_super {
+	union {
+		void *buf; /* O_DIRECT buffer for reading/writing metadata */
+		struct imsm_super *anchor; /* immovable parameters */
+	};
+	union {
+		void *migr_rec_buf; /* buffer for I/O operations */
+		struct migr_record *migr_rec; /* migration record */
+	};
+	int clean_migration_record_by_mdmon; /* when reshape is switched to next
+		array, it indicates that mdmon is allowed to clean migration
+		record */
+	size_t len; /* size of the 'buf' allocation */
+	size_t extra_space; /* extra space in 'buf' that is not used yet */
+	void *next_buf; /* for realloc'ing buf from the manager */
+	size_t next_len;
+	int updates_pending; /* count of pending updates for mdmon */
+	int current_vol; /* index of raid device undergoing creation */
+	unsigned long long create_offset; /* common start for 'current_vol' */
+	__u32 random; /* random data for seeding new family numbers */
+	struct intel_dev *devlist;
+	unsigned int sector_size; /* sector size of used member drives */
+	struct dl {
+		struct dl *next;
+		int index;
+		__u8 serial[MAX_RAID_SERIAL_LEN];
+		int major, minor;
+		char *devname;
+		struct imsm_disk disk;
+		int fd;
+		int extent_cnt;
+		struct extent *e; /* for determining freespace @ create */
+		int raiddisk; /* slot to fill in autolayout */
+		enum action action;
+	} *disks, *current_disk;
+	struct dl *disk_mgmt_list; /* list of disks to add/remove while mdmon
+				      active */
+	struct dl *missing; /* disks removed while we weren't looking */
+	struct bbm_log *bbm_log;
+	struct intel_hba *hba; /* device path of the raid controller for this metadata */
+	const struct imsm_orom *orom; /* platform firmware support */
+	struct intel_super *next; /* (temp) list for disambiguating family_num */
+	struct md_bb bb;	/* memory for get_bad_blocks call */
+};
+
+struct intel_disk {
+	struct imsm_disk disk;
+	#define IMSM_UNKNOWN_OWNER (-1)
+	int owner;
+	struct intel_disk *next;
+};
+
+struct extent {
+	unsigned long long start, size;
+};
+
+/* definitions of reshape process types */
+enum imsm_reshape_type {
+	CH_TAKEOVER,
+	CH_MIGRATION,
+	CH_ARRAY_SIZE,
+};
+
+/* definition of messages passed to imsm_process_update */
+enum imsm_update_type {
+	update_activate_spare,
+	update_create_array,
+	update_kill_array,
+	update_rename_array,
+	update_add_remove_disk,
+	update_reshape_container_disks,
+	update_reshape_migration,
+	update_takeover,
+	update_general_migration_checkpoint,
+	update_size_change,
+	update_prealloc_badblocks_mem,
+	update_rwh_policy,
+};
+
+struct imsm_update_activate_spare {
+	enum imsm_update_type type;
+	struct dl *dl;
+	int slot;
+	int array;
+	struct imsm_update_activate_spare *next;
+};
+
+struct geo_params {
+	char devnm[32];
+	char *dev_name;
+	unsigned long long size;
+	int level;
+	int layout;
+	int chunksize;
+	int raid_disks;
+};
+
+enum takeover_direction {
+	R10_TO_R0,
+	R0_TO_R10
+};
+struct imsm_update_takeover {
+	enum imsm_update_type type;
+	int subarray;
+	enum takeover_direction direction;
+};
+
+struct imsm_update_reshape {
+	enum imsm_update_type type;
+	int old_raid_disks;
+	int new_raid_disks;
+
+	int new_disks[1]; /* new_raid_disks - old_raid_disks makedev number */
+};
+
+struct imsm_update_reshape_migration {
+	enum imsm_update_type type;
+	int old_raid_disks;
+	int new_raid_disks;
+	/* fields for array migration changes
+	 */
+	int subdev;
+	int new_level;
+	int new_layout;
+	int new_chunksize;
+
+	int new_disks[1]; /* new_raid_disks - old_raid_disks makedev number */
+};
+
+struct imsm_update_size_change {
+	enum imsm_update_type type;
+	int subdev;
+	long long new_size;
+};
+
+struct imsm_update_general_migration_checkpoint {
+	enum imsm_update_type type;
+	__u64 curr_migr_unit;
+};
+
+struct disk_info {
+	__u8 serial[MAX_RAID_SERIAL_LEN];
+};
+
+struct imsm_update_create_array {
+	enum imsm_update_type type;
+	int dev_idx;
+	struct imsm_dev dev;
+};
+
+struct imsm_update_kill_array {
+	enum imsm_update_type type;
+	int dev_idx;
+};
+
+struct imsm_update_rename_array {
+	enum imsm_update_type type;
+	__u8 name[MAX_RAID_SERIAL_LEN];
+	int dev_idx;
+};
+
+struct imsm_update_add_remove_disk {
+	enum imsm_update_type type;
+};
+
+struct imsm_update_prealloc_bb_mem {
+	enum imsm_update_type type;
+};
+
+struct imsm_update_rwh_policy {
+	enum imsm_update_type type;
+	int new_policy;
+	int dev_idx;
+};
+
+static const char *_sys_dev_type[] = {
+	[SYS_DEV_UNKNOWN] = "Unknown",
+	[SYS_DEV_SAS] = "SAS",
+	[SYS_DEV_SATA] = "SATA",
+	[SYS_DEV_NVME] = "NVMe",
+	[SYS_DEV_VMD] = "VMD"
+};
+
+const char *get_sys_dev_type(enum sys_dev_type type)
+{
+	if (type >= SYS_DEV_MAX)
+		type = SYS_DEV_UNKNOWN;
+
+	return _sys_dev_type[type];
+}
+
+static struct intel_hba * alloc_intel_hba(struct sys_dev *device)
+{
+	struct intel_hba *result = xmalloc(sizeof(*result));
+
+	result->type = device->type;
+	result->path = xstrdup(device->path);
+	result->next = NULL;
+	if (result->path && (result->pci_id = strrchr(result->path, '/')) != NULL)
+		result->pci_id++;
+
+	return result;
+}
+
+static struct intel_hba * find_intel_hba(struct intel_hba *hba, struct sys_dev *device)
+{
+	struct intel_hba *result;
+
+	for (result = hba; result; result = result->next) {
+		if (result->type == device->type && strcmp(result->path, device->path) == 0)
+			break;
+	}
+	return result;
+}
+
+static int attach_hba_to_super(struct intel_super *super, struct sys_dev *device)
+{
+	struct intel_hba *hba;
+
+	/* check if disk attached to Intel HBA */
+	hba = find_intel_hba(super->hba, device);
+	if (hba != NULL)
+		return 1;
+	/* Check if HBA is already attached to super */
+	if (super->hba == NULL) {
+		super->hba = alloc_intel_hba(device);
+		return 1;
+	}
+
+	hba = super->hba;
+	/* Intel metadata allows for all disks attached to the same type HBA.
+	 * Do not support HBA types mixing
+	 */
+	if (device->type != hba->type)
+		return 2;
+
+	/* Multiple same type HBAs can be used if they share the same OROM */
+	const struct imsm_orom *device_orom = get_orom_by_device_id(device->dev_id);
+
+	if (device_orom != super->orom)
+		return 2;
+
+	while (hba->next)
+		hba = hba->next;
+
+	hba->next = alloc_intel_hba(device);
+	return 1;
+}
+
+static struct sys_dev* find_disk_attached_hba(int fd, const char *devname)
+{
+	struct sys_dev *list, *elem;
+	char *disk_path;
+
+	if ((list = find_intel_devices()) == NULL)
+		return 0;
+
+	if (!is_fd_valid(fd))
+		disk_path  = (char *) devname;
+	else
+		disk_path = diskfd_to_devpath(fd, 1, NULL);
+
+	if (!disk_path)
+		return 0;
+
+	for (elem = list; elem; elem = elem->next)
+		if (path_attached_to_hba(disk_path, elem->path))
+			return elem;
+
+	if (disk_path != devname)
+		free(disk_path);
+
+	return NULL;
+}
+
+static int find_intel_hba_capability(int fd, struct intel_super *super,
+				     char *devname);
+
+static struct supertype *match_metadata_desc_imsm(char *arg)
+{
+	struct supertype *st;
+
+	if (strcmp(arg, "imsm") != 0 &&
+	    strcmp(arg, "default") != 0
+		)
+		return NULL;
+
+	st = xcalloc(1, sizeof(*st));
+	st->ss = &super_imsm;
+	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];
+}
+
+/* retrieve a disk directly from the anchor when the anchor is known to be
+ * up-to-date, currently only at load time
+ */
+static struct imsm_disk *__get_imsm_disk(struct imsm_super *mpb, __u8 index)
+{
+	if (index >= mpb->num_disks)
+		return NULL;
+	return &mpb->disk[index];
+}
+
+/* retrieve the disk description based on a index of the disk
+ * in the sub-array
+ */
+static struct dl *get_imsm_dl_disk(struct intel_super *super, __u8 index)
+{
+	struct dl *d;
+
+	for (d = super->disks; d; d = d->next)
+		if (d->index == index)
+			return d;
+
+	return NULL;
+}
+/* retrieve a disk from the parsed metadata */
+static struct imsm_disk *get_imsm_disk(struct intel_super *super, __u8 index)
+{
+	struct dl *dl;
+
+	dl = get_imsm_dl_disk(super, index);
+	if (dl)
+		return &dl->disk;
+
+	return NULL;
+}
+
+/* generate a checksum directly from the anchor when the anchor is known to be
+ * up-to-date, currently only at load or write_super after coalescing
+ */
+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);
+		p++;
+	}
+
+	return sum - __le32_to_cpu(mpb->check_sum);
+}
+
+static size_t sizeof_imsm_map(struct imsm_map *map)
+{
+	return sizeof(struct imsm_map) + sizeof(__u32) * (map->num_members - 1);
+}
+
+struct imsm_map *get_imsm_map(struct imsm_dev *dev, int second_map)
+{
+	/* A device can have 2 maps if it is in the middle of a migration.
+	 * If second_map is:
+	 *    MAP_0 - we return the first map
+	 *    MAP_1 - we return the second map if it exists, else NULL
+	 *    MAP_X - we return the second map if it exists, else the first
+	 */
+	struct imsm_map *map = &dev->vol.map[0];
+	struct imsm_map *map2 = NULL;
+
+	if (dev->vol.migr_state)
+		map2 = (void *)map + sizeof_imsm_map(map);
+
+	switch (second_map) {
+	case MAP_0:
+		break;
+	case MAP_1:
+		map = map2;
+		break;
+	case MAP_X:
+		if (map2)
+			map = map2;
+		break;
+	default:
+		map = NULL;
+	}
+	return map;
+
+}
+
+/* return the size of the device.
+ * migr_state increases the returned size if map[0] were to be duplicated
+ */
+static size_t sizeof_imsm_dev(struct imsm_dev *dev, int migr_state)
+{
+	size_t size = sizeof(*dev) - sizeof(struct imsm_map) +
+		      sizeof_imsm_map(get_imsm_map(dev, MAP_0));
+
+	/* migrating means an additional map */
+	if (dev->vol.migr_state)
+		size += sizeof_imsm_map(get_imsm_map(dev, MAP_1));
+	else if (migr_state)
+		size += sizeof_imsm_map(get_imsm_map(dev, MAP_0));
+
+	return size;
+}
+
+/* retrieve disk serial number list from a metadata update */
+static struct disk_info *get_disk_info(struct imsm_update_create_array *update)
+{
+	void *u = update;
+	struct disk_info *inf;
+
+	inf = u + sizeof(*update) - sizeof(struct imsm_dev) +
+	      sizeof_imsm_dev(&update->dev, 0);
+
+	return inf;
+}
+
+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)
+		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, 0);
+
+	return NULL;
+}
+
+static struct imsm_dev *get_imsm_dev(struct intel_super *super, __u8 index)
+{
+	struct intel_dev *dv;
+
+	if (index >= super->anchor->num_raid_devs)
+		return NULL;
+	for (dv = super->devlist; dv; dv = dv->next)
+		if (dv->index == index)
+			return dv->dev;
+	return NULL;
+}
+
+static inline unsigned long long __le48_to_cpu(const struct bbm_log_block_addr
+					       *addr)
+{
+	return ((((__u64)__le32_to_cpu(addr->dw1)) << 16) |
+		__le16_to_cpu(addr->w1));
+}
+
+static inline struct bbm_log_block_addr __cpu_to_le48(unsigned long long sec)
+{
+	struct bbm_log_block_addr addr;
+
+	addr.w1 =  __cpu_to_le16((__u16)(sec & 0xffff));
+	addr.dw1 = __cpu_to_le32((__u32)(sec >> 16) & 0xffffffff);
+	return addr;
+}
+
+/* get size of the bbm log */
+static __u32 get_imsm_bbm_log_size(struct bbm_log *log)
+{
+	if (!log || log->entry_count == 0)
+		return 0;
+
+	return sizeof(log->signature) +
+		sizeof(log->entry_count) +
+		log->entry_count * sizeof(struct bbm_log_entry);
+}
+
+/* check if bad block is not partially stored in bbm log */
+static int is_stored_in_bbm(struct bbm_log *log, const __u8 idx, const unsigned
+			    long long sector, const int length, __u32 *pos)
+{
+	__u32 i;
+
+	for (i = *pos; i < log->entry_count; i++) {
+		struct bbm_log_entry *entry = &log->marked_block_entries[i];
+		unsigned long long bb_start;
+		unsigned long long bb_end;
+
+		bb_start = __le48_to_cpu(&entry->defective_block_start);
+		bb_end = bb_start + (entry->marked_count + 1);
+
+		if ((entry->disk_ordinal == idx) && (bb_start >= sector) &&
+		    (bb_end <= sector + length)) {
+			*pos = i;
+			return 1;
+		}
+	}
+	return 0;
+}
+
+/* record new bad block in bbm log */
+static int record_new_badblock(struct bbm_log *log, const __u8 idx, unsigned
+			       long long sector, int length)
+{
+	int new_bb = 0;
+	__u32 pos = 0;
+	struct bbm_log_entry *entry = NULL;
+
+	while (is_stored_in_bbm(log, idx, sector, length, &pos)) {
+		struct bbm_log_entry *e = &log->marked_block_entries[pos];
+
+		if ((e->marked_count + 1 == BBM_LOG_MAX_LBA_ENTRY_VAL) &&
+		    (__le48_to_cpu(&e->defective_block_start) == sector)) {
+			sector += BBM_LOG_MAX_LBA_ENTRY_VAL;
+			length -= BBM_LOG_MAX_LBA_ENTRY_VAL;
+			pos = pos + 1;
+			continue;
+		}
+		entry = e;
+		break;
+	}
+
+	if (entry) {
+		int cnt = (length <= BBM_LOG_MAX_LBA_ENTRY_VAL) ? length :
+			BBM_LOG_MAX_LBA_ENTRY_VAL;
+		entry->defective_block_start = __cpu_to_le48(sector);
+		entry->marked_count = cnt - 1;
+		if (cnt == length)
+			return 1;
+		sector += cnt;
+		length -= cnt;
+	}
+
+	new_bb = ROUND_UP(length, BBM_LOG_MAX_LBA_ENTRY_VAL) /
+		BBM_LOG_MAX_LBA_ENTRY_VAL;
+	if (log->entry_count + new_bb > BBM_LOG_MAX_ENTRIES)
+		return 0;
+
+	while (length > 0) {
+		int cnt = (length <= BBM_LOG_MAX_LBA_ENTRY_VAL) ? length :
+			BBM_LOG_MAX_LBA_ENTRY_VAL;
+		struct bbm_log_entry *entry =
+			&log->marked_block_entries[log->entry_count];
+
+		entry->defective_block_start = __cpu_to_le48(sector);
+		entry->marked_count = cnt - 1;
+		entry->disk_ordinal = idx;
+
+		sector += cnt;
+		length -= cnt;
+
+		log->entry_count++;
+	}
+
+	return new_bb;
+}
+
+/* clear all bad blocks for given disk */
+static void clear_disk_badblocks(struct bbm_log *log, const __u8 idx)
+{
+	__u32 i = 0;
+
+	while (i < log->entry_count) {
+		struct bbm_log_entry *entries = log->marked_block_entries;
+
+		if (entries[i].disk_ordinal == idx) {
+			if (i < log->entry_count - 1)
+				entries[i] = entries[log->entry_count - 1];
+			log->entry_count--;
+		} else {
+			i++;
+		}
+	}
+}
+
+/* clear given bad block */
+static int clear_badblock(struct bbm_log *log, const __u8 idx, const unsigned
+			  long long sector, const int length) {
+	__u32 i = 0;
+
+	while (i < log->entry_count) {
+		struct bbm_log_entry *entries = log->marked_block_entries;
+
+		if ((entries[i].disk_ordinal == idx) &&
+		    (__le48_to_cpu(&entries[i].defective_block_start) ==
+		     sector) && (entries[i].marked_count + 1 == length)) {
+			if (i < log->entry_count - 1)
+				entries[i] = entries[log->entry_count - 1];
+			log->entry_count--;
+			break;
+		}
+		i++;
+	}
+
+	return 1;
+}
+
+/* allocate and load BBM log from metadata */
+static int load_bbm_log(struct intel_super *super)
+{
+	struct imsm_super *mpb = super->anchor;
+	__u32 bbm_log_size =  __le32_to_cpu(mpb->bbm_log_size);
+
+	super->bbm_log = xcalloc(1, sizeof(struct bbm_log));
+	if (!super->bbm_log)
+		return 1;
+
+	if (bbm_log_size) {
+		struct bbm_log *log = (void *)mpb +
+			__le32_to_cpu(mpb->mpb_size) - bbm_log_size;
+
+		__u32 entry_count;
+
+		if (bbm_log_size < sizeof(log->signature) +
+		    sizeof(log->entry_count))
+			return 2;
+
+		entry_count = __le32_to_cpu(log->entry_count);
+		if ((__le32_to_cpu(log->signature) != BBM_LOG_SIGNATURE) ||
+		    (entry_count > BBM_LOG_MAX_ENTRIES))
+			return 3;
+
+		if (bbm_log_size !=
+		    sizeof(log->signature) + sizeof(log->entry_count) +
+		    entry_count * sizeof(struct bbm_log_entry))
+			return 4;
+
+		memcpy(super->bbm_log, log, bbm_log_size);
+	} else {
+		super->bbm_log->signature = __cpu_to_le32(BBM_LOG_SIGNATURE);
+		super->bbm_log->entry_count = 0;
+	}
+
+	return 0;
+}
+
+/* checks if bad block is within volume boundaries */
+static int is_bad_block_in_volume(const struct bbm_log_entry *entry,
+			const unsigned long long start_sector,
+			const unsigned long long size)
+{
+	unsigned long long bb_start;
+	unsigned long long bb_end;
+
+	bb_start = __le48_to_cpu(&entry->defective_block_start);
+	bb_end = bb_start + (entry->marked_count + 1);
+
+	if (((bb_start >= start_sector) && (bb_start < start_sector + size)) ||
+	    ((bb_end >= start_sector) && (bb_end <= start_sector + size)))
+		return 1;
+
+	return 0;
+}
+
+/* get list of bad blocks on a drive for a volume */
+static void get_volume_badblocks(const struct bbm_log *log, const __u8 idx,
+			const unsigned long long start_sector,
+			const unsigned long long size,
+			struct md_bb *bbs)
+{
+	__u32 count = 0;
+	__u32 i;
+
+	for (i = 0; i < log->entry_count; i++) {
+		const struct bbm_log_entry *ent =
+			&log->marked_block_entries[i];
+		struct md_bb_entry *bb;
+
+		if ((ent->disk_ordinal == idx) &&
+		    is_bad_block_in_volume(ent, start_sector, size)) {
+
+			if (!bbs->entries) {
+				bbs->entries = xmalloc(BBM_LOG_MAX_ENTRIES *
+						     sizeof(*bb));
+				if (!bbs->entries)
+					break;
+			}
+
+			bb = &bbs->entries[count++];
+			bb->sector = __le48_to_cpu(&ent->defective_block_start);
+			bb->length = ent->marked_count + 1;
+		}
+	}
+	bbs->count = count;
+}
+
+/*
+ * for second_map:
+ *  == MAP_0 get first map
+ *  == MAP_1 get second map
+ *  == MAP_X than get map according to the current migr_state
+ */
+static __u32 get_imsm_ord_tbl_ent(struct imsm_dev *dev,
+				  int slot,
+				  int second_map)
+{
+	struct imsm_map *map;
+
+	map = get_imsm_map(dev, second_map);
+
+	/* top byte identifies disk under rebuild */
+	return __le32_to_cpu(map->disk_ord_tbl[slot]);
+}
+
+#define ord_to_idx(ord) (((ord) << 8) >> 8)
+static __u32 get_imsm_disk_idx(struct imsm_dev *dev, int slot, int second_map)
+{
+	__u32 ord = get_imsm_ord_tbl_ent(dev, slot, second_map);
+
+	return ord_to_idx(ord);
+}
+
+static void set_imsm_ord_tbl_ent(struct imsm_map *map, int slot, __u32 ord)
+{
+	map->disk_ord_tbl[slot] = __cpu_to_le32(ord);
+}
+
+static int get_imsm_disk_slot(struct imsm_map *map, unsigned idx)
+{
+	int slot;
+	__u32 ord;
+
+	for (slot = 0; slot < map->num_members; slot++) {
+		ord = __le32_to_cpu(map->disk_ord_tbl[slot]);
+		if (ord_to_idx(ord) == idx)
+			return slot;
+	}
+
+	return -1;
+}
+
+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 int cmp_extent(const void *av, const void *bv)
+{
+	const struct extent *a = av;
+	const struct extent *b = bv;
+	if (a->start < b->start)
+		return -1;
+	if (a->start > b->start)
+		return 1;
+	return 0;
+}
+
+static int count_memberships(struct dl *dl, struct intel_super *super)
+{
+	int memberships = 0;
+	int i;
+
+	for (i = 0; i < super->anchor->num_raid_devs; i++) {
+		struct imsm_dev *dev = get_imsm_dev(super, i);
+		struct imsm_map *map = get_imsm_map(dev, MAP_0);
+
+		if (get_imsm_disk_slot(map, dl->index) >= 0)
+			memberships++;
+	}
+
+	return memberships;
+}
+
+static __u32 imsm_min_reserved_sectors(struct intel_super *super);
+
+static int split_ull(unsigned long long n, void *lo, void *hi)
+{
+	if (lo == 0 || hi == 0)
+		return 1;
+	__put_unaligned32(__cpu_to_le32((__u32)n), lo);
+	__put_unaligned32(__cpu_to_le32((n >> 32)), hi);
+	return 0;
+}
+
+static unsigned long long join_u32(__u32 lo, __u32 hi)
+{
+	return (unsigned long long)__le32_to_cpu(lo) |
+	       (((unsigned long long)__le32_to_cpu(hi)) << 32);
+}
+
+static unsigned long long total_blocks(struct imsm_disk *disk)
+{
+	if (disk == NULL)
+		return 0;
+	return join_u32(disk->total_blocks_lo, disk->total_blocks_hi);
+}
+
+/**
+ * imsm_num_data_members() - get data drives count for an array.
+ * @map: Map to analyze.
+ *
+ * num_data_members value represents minimal count of drives for level.
+ * The name of the property could be misleading for RAID5 with asymmetric layout
+ * because some data required to be calculated from parity.
+ * The property is extracted from level and num_members value.
+ *
+ * Return: num_data_members value on success, zero otherwise.
+ */
+static __u8 imsm_num_data_members(struct imsm_map *map)
+{
+	switch (get_imsm_raid_level(map)) {
+	case 0:
+		return map->num_members;
+	case 1:
+	case 10:
+		return map->num_members / 2;
+	case 5:
+		return map->num_members - 1;
+	default:
+		dprintf("unsupported raid level\n");
+		return 0;
+	}
+}
+
+static unsigned long long pba_of_lba0(struct imsm_map *map)
+{
+	if (map == NULL)
+		return 0;
+	return join_u32(map->pba_of_lba0_lo, map->pba_of_lba0_hi);
+}
+
+static unsigned long long blocks_per_member(struct imsm_map *map)
+{
+	if (map == NULL)
+		return 0;
+	return join_u32(map->blocks_per_member_lo, map->blocks_per_member_hi);
+}
+
+static unsigned long long num_data_stripes(struct imsm_map *map)
+{
+	if (map == NULL)
+		return 0;
+	return join_u32(map->num_data_stripes_lo, map->num_data_stripes_hi);
+}
+
+static unsigned long long vol_curr_migr_unit(struct imsm_dev *dev)
+{
+	if (dev == NULL)
+		return 0;
+
+	return join_u32(dev->vol.curr_migr_unit_lo, dev->vol.curr_migr_unit_hi);
+}
+
+static unsigned long long imsm_dev_size(struct imsm_dev *dev)
+{
+	if (dev == NULL)
+		return 0;
+	return join_u32(dev->size_low, dev->size_high);
+}
+
+static unsigned long long migr_chkp_area_pba(struct migr_record *migr_rec)
+{
+	if (migr_rec == NULL)
+		return 0;
+	return join_u32(migr_rec->ckpt_area_pba_lo,
+			migr_rec->ckpt_area_pba_hi);
+}
+
+static unsigned long long current_migr_unit(struct migr_record *migr_rec)
+{
+	if (migr_rec == NULL)
+		return 0;
+	return join_u32(migr_rec->curr_migr_unit_lo,
+			migr_rec->curr_migr_unit_hi);
+}
+
+static unsigned long long migr_dest_1st_member_lba(struct migr_record *migr_rec)
+{
+	if (migr_rec == NULL)
+		return 0;
+	return join_u32(migr_rec->dest_1st_member_lba_lo,
+			migr_rec->dest_1st_member_lba_hi);
+}
+
+static unsigned long long get_num_migr_units(struct migr_record *migr_rec)
+{
+	if (migr_rec == NULL)
+		return 0;
+	return join_u32(migr_rec->num_migr_units_lo,
+			migr_rec->num_migr_units_hi);
+}
+
+static void set_total_blocks(struct imsm_disk *disk, unsigned long long n)
+{
+	split_ull(n, &disk->total_blocks_lo, &disk->total_blocks_hi);
+}
+
+/**
+ * set_num_domains() - Set number of domains for an array.
+ * @map: Map to be updated.
+ *
+ * num_domains property represents copies count of each data drive, thus make
+ * it meaningful only for RAID1 and RAID10. IMSM supports two domains for
+ * raid1 and raid10.
+ */
+static void set_num_domains(struct imsm_map *map)
+{
+	int level = get_imsm_raid_level(map);
+
+	if (level == 1 || level == 10)
+		map->num_domains = 2;
+	else
+		map->num_domains = 1;
+}
+
+static void set_pba_of_lba0(struct imsm_map *map, unsigned long long n)
+{
+	split_ull(n, &map->pba_of_lba0_lo, &map->pba_of_lba0_hi);
+}
+
+static void set_blocks_per_member(struct imsm_map *map, unsigned long long n)
+{
+	split_ull(n, &map->blocks_per_member_lo, &map->blocks_per_member_hi);
+}
+
+static void set_num_data_stripes(struct imsm_map *map, unsigned long long n)
+{
+	split_ull(n, &map->num_data_stripes_lo, &map->num_data_stripes_hi);
+}
+
+/**
+ * update_num_data_stripes() - Calculate and update num_data_stripes value.
+ * @map: map to be updated.
+ * @dev_size: size of volume.
+ *
+ * num_data_stripes value is addictionally divided by num_domains, therefore for
+ * levels where num_domains is not 1, nds is a part of real value.
+ */
+static void update_num_data_stripes(struct imsm_map *map,
+				     unsigned long long dev_size)
+{
+	unsigned long long nds = dev_size / imsm_num_data_members(map);
+
+	nds /= map->num_domains;
+	nds /= map->blocks_per_strip;
+	set_num_data_stripes(map, nds);
+}
+
+static void set_vol_curr_migr_unit(struct imsm_dev *dev, unsigned long long n)
+{
+	if (dev == NULL)
+		return;
+
+	split_ull(n, &dev->vol.curr_migr_unit_lo, &dev->vol.curr_migr_unit_hi);
+}
+
+static void set_imsm_dev_size(struct imsm_dev *dev, unsigned long long n)
+{
+	split_ull(n, &dev->size_low, &dev->size_high);
+}
+
+static void set_migr_chkp_area_pba(struct migr_record *migr_rec,
+				   unsigned long long n)
+{
+	split_ull(n, &migr_rec->ckpt_area_pba_lo, &migr_rec->ckpt_area_pba_hi);
+}
+
+static void set_current_migr_unit(struct migr_record *migr_rec,
+				  unsigned long long n)
+{
+	split_ull(n, &migr_rec->curr_migr_unit_lo,
+		  &migr_rec->curr_migr_unit_hi);
+}
+
+static void set_migr_dest_1st_member_lba(struct migr_record *migr_rec,
+					 unsigned long long n)
+{
+	split_ull(n, &migr_rec->dest_1st_member_lba_lo,
+		  &migr_rec->dest_1st_member_lba_hi);
+}
+
+static void set_num_migr_units(struct migr_record *migr_rec,
+			       unsigned long long n)
+{
+	split_ull(n, &migr_rec->num_migr_units_lo,
+		  &migr_rec->num_migr_units_hi);
+}
+
+static unsigned long long per_dev_array_size(struct imsm_map *map)
+{
+	unsigned long long array_size = 0;
+
+	if (map == NULL)
+		return array_size;
+
+	array_size = num_data_stripes(map) * map->blocks_per_strip;
+	if (get_imsm_raid_level(map) == 1 || get_imsm_raid_level(map) == 10)
+		array_size *= 2;
+
+	return array_size;
+}
+
+static struct extent *get_extents(struct intel_super *super, struct dl *dl,
+				  int get_minimal_reservation)
+{
+	/* find a list of used extents on the given physical device */
+	struct extent *rv, *e;
+	int i;
+	int memberships = count_memberships(dl, super);
+	__u32 reservation;
+
+	/* trim the reserved area for spares, so they can join any array
+	 * regardless of whether the OROM has assigned sectors from the
+	 * IMSM_RESERVED_SECTORS region
+	 */
+	if (dl->index == -1 || get_minimal_reservation)
+		reservation = imsm_min_reserved_sectors(super);
+	else
+		reservation = MPB_SECTOR_CNT + IMSM_RESERVED_SECTORS;
+
+	rv = xcalloc(sizeof(struct extent), (memberships + 1));
+	e = rv;
+
+	for (i = 0; i < super->anchor->num_raid_devs; i++) {
+		struct imsm_dev *dev = get_imsm_dev(super, i);
+		struct imsm_map *map = get_imsm_map(dev, MAP_0);
+
+		if (get_imsm_disk_slot(map, dl->index) >= 0) {
+			e->start = pba_of_lba0(map);
+			e->size = per_dev_array_size(map);
+			e++;
+		}
+	}
+	qsort(rv, memberships, sizeof(*rv), cmp_extent);
+
+	/* determine the start of the metadata
+	 * when no raid devices are defined use the default
+	 * ...otherwise allow the metadata to truncate the value
+	 * as is the case with older versions of imsm
+	 */
+	if (memberships) {
+		struct extent *last = &rv[memberships - 1];
+		unsigned long long remainder;
+
+		remainder = total_blocks(&dl->disk) - (last->start + last->size);
+		/* round down to 1k block to satisfy precision of the kernel
+		 * 'size' interface
+		 */
+		remainder &= ~1UL;
+		/* make sure remainder is still sane */
+		if (remainder < (unsigned)ROUND_UP(super->len, 512) >> 9)
+			remainder = ROUND_UP(super->len, 512) >> 9;
+		if (reservation > remainder)
+			reservation = remainder;
+	}
+	e->start = total_blocks(&dl->disk) - reservation;
+	e->size = 0;
+	return rv;
+}
+
+/* try to determine how much space is reserved for metadata from
+ * the last get_extents() entry, otherwise fallback to the
+ * default
+ */
+static __u32 imsm_reserved_sectors(struct intel_super *super, struct dl *dl)
+{
+	struct extent *e;
+	int i;
+	__u32 rv;
+
+	/* for spares just return a minimal reservation which will grow
+	 * once the spare is picked up by an array
+	 */
+	if (dl->index == -1)
+		return MPB_SECTOR_CNT;
+
+	e = get_extents(super, dl, 0);
+	if (!e)
+		return MPB_SECTOR_CNT + IMSM_RESERVED_SECTORS;
+
+	/* scroll to last entry */
+	for (i = 0; e[i].size; i++)
+		continue;
+
+	rv = total_blocks(&dl->disk) - e[i].start;
+
+	free(e);
+
+	return rv;
+}
+
+static int is_spare(struct imsm_disk *disk)
+{
+	return (disk->status & SPARE_DISK) == SPARE_DISK;
+}
+
+static int is_configured(struct imsm_disk *disk)
+{
+	return (disk->status & CONFIGURED_DISK) == CONFIGURED_DISK;
+}
+
+static int is_failed(struct imsm_disk *disk)
+{
+	return (disk->status & FAILED_DISK) == FAILED_DISK;
+}
+
+static int is_journal(struct imsm_disk *disk)
+{
+	return (disk->status & JOURNAL_DISK) == JOURNAL_DISK;
+}
+
+/* round array size down to closest MB and ensure it splits evenly
+ * between members
+ */
+static unsigned long long round_size_to_mb(unsigned long long size, unsigned int
+					   disk_count)
+{
+	size /= disk_count;
+	size = (size >> SECT_PER_MB_SHIFT) << SECT_PER_MB_SHIFT;
+	size *= disk_count;
+
+	return size;
+}
+
+static int able_to_resync(int raid_level, int missing_disks)
+{
+	int max_missing_disks = 0;
+
+	switch (raid_level) {
+	case 10:
+		max_missing_disks = 1;
+		break;
+	default:
+		max_missing_disks = 0;
+	}
+	return missing_disks <= max_missing_disks;
+}
+
+/* try to determine how much space is reserved for metadata from
+ * the last get_extents() entry on the smallest active disk,
+ * otherwise fallback to the default
+ */
+static __u32 imsm_min_reserved_sectors(struct intel_super *super)
+{
+	struct extent *e;
+	int i;
+	unsigned long long min_active;
+	__u32 remainder;
+	__u32 rv = MPB_SECTOR_CNT + IMSM_RESERVED_SECTORS;
+	struct dl *dl, *dl_min = NULL;
+
+	if (!super)
+		return rv;
+
+	min_active = 0;
+	for (dl = super->disks; dl; dl = dl->next) {
+		if (dl->index < 0)
+			continue;
+		unsigned long long blocks = total_blocks(&dl->disk);
+		if (blocks < min_active || min_active == 0) {
+			dl_min = dl;
+			min_active = blocks;
+		}
+	}
+	if (!dl_min)
+		return rv;
+
+	/* find last lba used by subarrays on the smallest active disk */
+	e = get_extents(super, dl_min, 0);
+	if (!e)
+		return rv;
+	for (i = 0; e[i].size; i++)
+		continue;
+
+	remainder = min_active - e[i].start;
+	free(e);
+
+	/* to give priority to recovery we should not require full
+	   IMSM_RESERVED_SECTORS from the spare */
+	rv = MPB_SECTOR_CNT + NUM_BLOCKS_DIRTY_STRIPE_REGION;
+
+	/* if real reservation is smaller use that value */
+	return  (remainder < rv) ? remainder : rv;
+}
+
+/*
+ * Return minimum size of a spare and sector size
+ * that can be used in this array
+ */
+int get_spare_criteria_imsm(struct supertype *st, struct spare_criteria *c)
+{
+	struct intel_super *super = st->sb;
+	struct dl *dl;
+	struct extent *e;
+	int i;
+	unsigned long long size = 0;
+
+	c->min_size = 0;
+	c->sector_size = 0;
+
+	if (!super)
+		return -EINVAL;
+	/* find first active disk in array */
+	dl = super->disks;
+	while (dl && (is_failed(&dl->disk) || dl->index == -1))
+		dl = dl->next;
+	if (!dl)
+		return -EINVAL;
+	/* find last lba used by subarrays */
+	e = get_extents(super, dl, 0);
+	if (!e)
+		return -EINVAL;
+	for (i = 0; e[i].size; i++)
+		continue;
+	if (i > 0)
+		size = e[i-1].start + e[i-1].size;
+	free(e);
+
+	/* add the amount of space needed for metadata */
+	size += imsm_min_reserved_sectors(super);
+
+	c->min_size = size * 512;
+	c->sector_size = super->sector_size;
+
+	return 0;
+}
+
+static bool is_gen_migration(struct imsm_dev *dev);
+
+#define IMSM_4K_DIV 8
+
+static __u64 blocks_per_migr_unit(struct intel_super *super,
+				  struct imsm_dev *dev);
+
+static void print_imsm_dev(struct intel_super *super,
+			   struct imsm_dev *dev,
+			   char *uuid,
+			   int disk_idx)
+{
+	__u64 sz;
+	int slot, i;
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	struct imsm_map *map2 = get_imsm_map(dev, MAP_1);
+	__u32 ord;
+
+	printf("\n");
+	printf("[%.16s]:\n", dev->volume);
+	printf("       Subarray : %d\n", super->current_vol);
+	printf("           UUID : %s\n", uuid);
+	printf("     RAID Level : %d", get_imsm_raid_level(map));
+	if (map2)
+		printf(" <-- %d", get_imsm_raid_level(map2));
+	printf("\n");
+	printf("        Members : %d", map->num_members);
+	if (map2)
+		printf(" <-- %d", map2->num_members);
+	printf("\n");
+	printf("          Slots : [");
+	for (i = 0; i < map->num_members; i++) {
+		ord = get_imsm_ord_tbl_ent(dev, i, MAP_0);
+		printf("%s", ord & IMSM_ORD_REBUILD ? "_" : "U");
+	}
+	printf("]");
+	if (map2) {
+		printf(" <-- [");
+		for (i = 0; i < map2->num_members; i++) {
+			ord = get_imsm_ord_tbl_ent(dev, i, MAP_1);
+			printf("%s", ord & IMSM_ORD_REBUILD ? "_" : "U");
+		}
+		printf("]");
+	}
+	printf("\n");
+	printf("    Failed disk : ");
+	if (map->failed_disk_num == 0xff)
+		printf("none");
+	else
+		printf("%i", map->failed_disk_num);
+	printf("\n");
+	slot = get_imsm_disk_slot(map, disk_idx);
+	if (slot >= 0) {
+		ord = get_imsm_ord_tbl_ent(dev, slot, MAP_X);
+		printf("      This Slot : %d%s\n", slot,
+		       ord & IMSM_ORD_REBUILD ? " (out-of-sync)" : "");
+	} else
+		printf("      This Slot : ?\n");
+	printf("    Sector Size : %u\n", super->sector_size);
+	sz = imsm_dev_size(dev);
+	printf("     Array Size : %llu%s\n",
+		   (unsigned long long)sz * 512 / super->sector_size,
+	       human_size(sz * 512));
+	sz = blocks_per_member(map);
+	printf("   Per Dev Size : %llu%s\n",
+		   (unsigned long long)sz * 512 / super->sector_size,
+	       human_size(sz * 512));
+	printf("  Sector Offset : %llu\n",
+		pba_of_lba0(map) * 512 / super->sector_size);
+	printf("    Num Stripes : %llu\n",
+		num_data_stripes(map));
+	printf("     Chunk Size : %u KiB",
+		__le16_to_cpu(map->blocks_per_strip) / 2);
+	if (map2)
+		printf(" <-- %u KiB",
+			__le16_to_cpu(map2->blocks_per_strip) / 2);
+	printf("\n");
+	printf("       Reserved : %d\n", __le32_to_cpu(dev->reserved_blocks));
+	printf("  Migrate State : ");
+	if (dev->vol.migr_state) {
+		if (migr_type(dev) == MIGR_INIT)
+			printf("initialize\n");
+		else if (migr_type(dev) == MIGR_REBUILD)
+			printf("rebuild\n");
+		else if (migr_type(dev) == MIGR_VERIFY)
+			printf("check\n");
+		else if (migr_type(dev) == MIGR_GEN_MIGR)
+			printf("general migration\n");
+		else if (migr_type(dev) == MIGR_STATE_CHANGE)
+			printf("state change\n");
+		else if (migr_type(dev) == MIGR_REPAIR)
+			printf("repair\n");
+		else
+			printf("<unknown:%d>\n", migr_type(dev));
+	} else
+		printf("idle\n");
+	printf("      Map State : %s", map_state_str[map->map_state]);
+	if (dev->vol.migr_state) {
+		struct imsm_map *map = get_imsm_map(dev, MAP_1);
+
+		printf(" <-- %s", map_state_str[map->map_state]);
+		printf("\n     Checkpoint : %llu ", vol_curr_migr_unit(dev));
+		if (is_gen_migration(dev) && (slot > 1 || slot < 0))
+			printf("(N/A)");
+		else
+			printf("(%llu)", (unsigned long long)
+				   blocks_per_migr_unit(super, dev));
+	}
+	printf("\n");
+	printf("    Dirty State : %s\n", (dev->vol.dirty & RAIDVOL_DIRTY) ?
+					 "dirty" : "clean");
+	printf("     RWH Policy : ");
+	if (dev->rwh_policy == RWH_OFF || dev->rwh_policy == RWH_MULTIPLE_OFF)
+		printf("off\n");
+	else if (dev->rwh_policy == RWH_DISTRIBUTED)
+		printf("PPL distributed\n");
+	else if (dev->rwh_policy == RWH_JOURNALING_DRIVE)
+		printf("PPL journaling drive\n");
+	else if (dev->rwh_policy == RWH_MULTIPLE_DISTRIBUTED)
+		printf("Multiple distributed PPLs\n");
+	else if (dev->rwh_policy == RWH_MULTIPLE_PPLS_JOURNALING_DRIVE)
+		printf("Multiple PPLs on journaling drive\n");
+	else if (dev->rwh_policy == RWH_BITMAP)
+		printf("Write-intent bitmap\n");
+	else
+		printf("<unknown:%d>\n", dev->rwh_policy);
+
+	printf("      Volume ID : %u\n", dev->my_vol_raid_dev_num);
+}
+
+static void print_imsm_disk(struct imsm_disk *disk,
+			    int index,
+			    __u32 reserved,
+			    unsigned int sector_size) {
+	char str[MAX_RAID_SERIAL_LEN + 1];
+	__u64 sz;
+
+	if (index < -1 || !disk)
+		return;
+
+	printf("\n");
+	snprintf(str, MAX_RAID_SERIAL_LEN + 1, "%s", disk->serial);
+	if (index >= 0)
+		printf("  Disk%02d Serial : %s\n", index, str);
+	else
+		printf("    Disk Serial : %s\n", str);
+	printf("          State :%s%s%s%s\n", is_spare(disk) ? " spare" : "",
+					      is_configured(disk) ? " active" : "",
+					      is_failed(disk) ? " failed" : "",
+					      is_journal(disk) ? " journal" : "");
+	printf("             Id : %08x\n", __le32_to_cpu(disk->scsi_id));
+	sz = total_blocks(disk) - reserved;
+	printf("    Usable Size : %llu%s\n",
+	       (unsigned long long)sz * 512 / sector_size,
+	       human_size(sz * 512));
+}
+
+void convert_to_4k_imsm_migr_rec(struct intel_super *super)
+{
+	struct migr_record *migr_rec = super->migr_rec;
+
+	migr_rec->blocks_per_unit /= IMSM_4K_DIV;
+	migr_rec->dest_depth_per_unit /= IMSM_4K_DIV;
+	split_ull((join_u32(migr_rec->post_migr_vol_cap,
+		 migr_rec->post_migr_vol_cap_hi) / IMSM_4K_DIV),
+		 &migr_rec->post_migr_vol_cap, &migr_rec->post_migr_vol_cap_hi);
+	set_migr_chkp_area_pba(migr_rec,
+		 migr_chkp_area_pba(migr_rec) / IMSM_4K_DIV);
+	set_migr_dest_1st_member_lba(migr_rec,
+		 migr_dest_1st_member_lba(migr_rec) / IMSM_4K_DIV);
+}
+
+void convert_to_4k_imsm_disk(struct imsm_disk *disk)
+{
+	set_total_blocks(disk, (total_blocks(disk)/IMSM_4K_DIV));
+}
+
+void convert_to_4k(struct intel_super *super)
+{
+	struct imsm_super *mpb = super->anchor;
+	struct imsm_disk *disk;
+	int i;
+	__u32 bbm_log_size = __le32_to_cpu(mpb->bbm_log_size);
+
+	for (i = 0; i < mpb->num_disks ; i++) {
+		disk = __get_imsm_disk(mpb, i);
+		/* disk */
+		convert_to_4k_imsm_disk(disk);
+	}
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev = __get_imsm_dev(mpb, i);
+		struct imsm_map *map = get_imsm_map(dev, MAP_0);
+		/* dev */
+		set_imsm_dev_size(dev, imsm_dev_size(dev)/IMSM_4K_DIV);
+		set_vol_curr_migr_unit(dev,
+				       vol_curr_migr_unit(dev) / IMSM_4K_DIV);
+
+		/* map0 */
+		set_blocks_per_member(map, blocks_per_member(map)/IMSM_4K_DIV);
+		map->blocks_per_strip /= IMSM_4K_DIV;
+		set_pba_of_lba0(map, pba_of_lba0(map)/IMSM_4K_DIV);
+
+		if (dev->vol.migr_state) {
+			/* map1 */
+			map = get_imsm_map(dev, MAP_1);
+			set_blocks_per_member(map,
+			    blocks_per_member(map)/IMSM_4K_DIV);
+			map->blocks_per_strip /= IMSM_4K_DIV;
+			set_pba_of_lba0(map, pba_of_lba0(map)/IMSM_4K_DIV);
+		}
+	}
+	if (bbm_log_size) {
+		struct bbm_log *log = (void *)mpb +
+			__le32_to_cpu(mpb->mpb_size) - bbm_log_size;
+		__u32 i;
+
+		for (i = 0; i < log->entry_count; i++) {
+			struct bbm_log_entry *entry =
+				&log->marked_block_entries[i];
+
+			__u8 count = entry->marked_count + 1;
+			unsigned long long sector =
+				__le48_to_cpu(&entry->defective_block_start);
+
+			entry->defective_block_start =
+				__cpu_to_le48(sector/IMSM_4K_DIV);
+			entry->marked_count = max(count/IMSM_4K_DIV, 1) - 1;
+		}
+	}
+
+	mpb->check_sum = __gen_imsm_checksum(mpb);
+}
+
+void examine_migr_rec_imsm(struct intel_super *super)
+{
+	struct migr_record *migr_rec = super->migr_rec;
+	struct imsm_super *mpb = super->anchor;
+	int i;
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev = __get_imsm_dev(mpb, i);
+		struct imsm_map *map;
+		int slot = -1;
+
+		if (is_gen_migration(dev) == false)
+				continue;
+
+		printf("\nMigration Record Information:");
+
+		/* first map under migration */
+		map = get_imsm_map(dev, MAP_0);
+		if (map)
+			slot = get_imsm_disk_slot(map, super->disks->index);
+		if (map == NULL || slot > 1 || slot < 0) {
+			printf(" Empty\n                              ");
+			printf("Examine one of first two disks in array\n");
+			break;
+		}
+		printf("\n                     Status : ");
+		if (__le32_to_cpu(migr_rec->rec_status) == UNIT_SRC_NORMAL)
+			printf("Normal\n");
+		else
+			printf("Contains Data\n");
+		printf("               Current Unit : %llu\n",
+		       current_migr_unit(migr_rec));
+		printf("                     Family : %u\n",
+		       __le32_to_cpu(migr_rec->family_num));
+		printf("                  Ascending : %u\n",
+		       __le32_to_cpu(migr_rec->ascending_migr));
+		printf("            Blocks Per Unit : %u\n",
+		       __le32_to_cpu(migr_rec->blocks_per_unit));
+		printf("       Dest. Depth Per Unit : %u\n",
+		       __le32_to_cpu(migr_rec->dest_depth_per_unit));
+		printf("        Checkpoint Area pba : %llu\n",
+		       migr_chkp_area_pba(migr_rec));
+		printf("           First member lba : %llu\n",
+		       migr_dest_1st_member_lba(migr_rec));
+		printf("      Total Number of Units : %llu\n",
+		       get_num_migr_units(migr_rec));
+		printf("             Size of volume : %llu\n",
+		       join_u32(migr_rec->post_migr_vol_cap,
+				migr_rec->post_migr_vol_cap_hi));
+		printf("       Record was read from : %u\n",
+		       __le32_to_cpu(migr_rec->ckpt_read_disk_num));
+
+		break;
+	}
+}
+
+void convert_from_4k_imsm_migr_rec(struct intel_super *super)
+{
+	struct migr_record *migr_rec = super->migr_rec;
+
+	migr_rec->blocks_per_unit *= IMSM_4K_DIV;
+	migr_rec->dest_depth_per_unit *= IMSM_4K_DIV;
+	split_ull((join_u32(migr_rec->post_migr_vol_cap,
+		 migr_rec->post_migr_vol_cap_hi) * IMSM_4K_DIV),
+		 &migr_rec->post_migr_vol_cap,
+		 &migr_rec->post_migr_vol_cap_hi);
+	set_migr_chkp_area_pba(migr_rec,
+		 migr_chkp_area_pba(migr_rec) * IMSM_4K_DIV);
+	set_migr_dest_1st_member_lba(migr_rec,
+		 migr_dest_1st_member_lba(migr_rec) * IMSM_4K_DIV);
+}
+
+void convert_from_4k(struct intel_super *super)
+{
+	struct imsm_super *mpb = super->anchor;
+	struct imsm_disk *disk;
+	int i;
+	__u32 bbm_log_size = __le32_to_cpu(mpb->bbm_log_size);
+
+	for (i = 0; i < mpb->num_disks ; i++) {
+		disk = __get_imsm_disk(mpb, i);
+		/* disk */
+		set_total_blocks(disk, (total_blocks(disk)*IMSM_4K_DIV));
+	}
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev = __get_imsm_dev(mpb, i);
+		struct imsm_map *map = get_imsm_map(dev, MAP_0);
+		/* dev */
+		set_imsm_dev_size(dev, imsm_dev_size(dev)*IMSM_4K_DIV);
+		set_vol_curr_migr_unit(dev,
+				       vol_curr_migr_unit(dev) * IMSM_4K_DIV);
+
+		/* map0 */
+		set_blocks_per_member(map, blocks_per_member(map)*IMSM_4K_DIV);
+		map->blocks_per_strip *= IMSM_4K_DIV;
+		set_pba_of_lba0(map, pba_of_lba0(map)*IMSM_4K_DIV);
+
+		if (dev->vol.migr_state) {
+			/* map1 */
+			map = get_imsm_map(dev, MAP_1);
+			set_blocks_per_member(map,
+			    blocks_per_member(map)*IMSM_4K_DIV);
+			map->blocks_per_strip *= IMSM_4K_DIV;
+			set_pba_of_lba0(map, pba_of_lba0(map)*IMSM_4K_DIV);
+		}
+	}
+	if (bbm_log_size) {
+		struct bbm_log *log = (void *)mpb +
+			__le32_to_cpu(mpb->mpb_size) - bbm_log_size;
+		__u32 i;
+
+		for (i = 0; i < log->entry_count; i++) {
+			struct bbm_log_entry *entry =
+				&log->marked_block_entries[i];
+
+			__u8 count = entry->marked_count + 1;
+			unsigned long long sector =
+				__le48_to_cpu(&entry->defective_block_start);
+
+			entry->defective_block_start =
+				__cpu_to_le48(sector*IMSM_4K_DIV);
+			entry->marked_count = count*IMSM_4K_DIV - 1;
+		}
+	}
+
+	mpb->check_sum = __gen_imsm_checksum(mpb);
+}
+
+/*******************************************************************************
+ * function: imsm_check_attributes
+ * Description: Function checks if features represented by attributes flags
+ *		are supported by mdadm.
+ * Parameters:
+ *		attributes - Attributes read from metadata
+ * Returns:
+ *		0 - passed attributes contains unsupported features flags
+ *		1 - all features are supported
+ ******************************************************************************/
+static int imsm_check_attributes(__u32 attributes)
+{
+	int ret_val = 1;
+	__u32 not_supported = MPB_ATTRIB_SUPPORTED^0xffffffff;
+
+	not_supported &= ~MPB_ATTRIB_IGNORED;
+
+	not_supported &= attributes;
+	if (not_supported) {
+		pr_err("(IMSM): Unsupported attributes : %x\n",
+			(unsigned)__le32_to_cpu(not_supported));
+		if (not_supported & MPB_ATTRIB_CHECKSUM_VERIFY) {
+			dprintf("\t\tMPB_ATTRIB_CHECKSUM_VERIFY \n");
+			not_supported ^= MPB_ATTRIB_CHECKSUM_VERIFY;
+		}
+		if (not_supported & MPB_ATTRIB_2TB) {
+			dprintf("\t\tMPB_ATTRIB_2TB\n");
+			not_supported ^= MPB_ATTRIB_2TB;
+		}
+		if (not_supported & MPB_ATTRIB_RAID0) {
+			dprintf("\t\tMPB_ATTRIB_RAID0\n");
+			not_supported ^= MPB_ATTRIB_RAID0;
+		}
+		if (not_supported & MPB_ATTRIB_RAID1) {
+			dprintf("\t\tMPB_ATTRIB_RAID1\n");
+			not_supported ^= MPB_ATTRIB_RAID1;
+		}
+		if (not_supported & MPB_ATTRIB_RAID10) {
+			dprintf("\t\tMPB_ATTRIB_RAID10\n");
+			not_supported ^= MPB_ATTRIB_RAID10;
+		}
+		if (not_supported & MPB_ATTRIB_RAID1E) {
+			dprintf("\t\tMPB_ATTRIB_RAID1E\n");
+			not_supported ^= MPB_ATTRIB_RAID1E;
+		}
+		if (not_supported & MPB_ATTRIB_RAID5) {
+		dprintf("\t\tMPB_ATTRIB_RAID5\n");
+			not_supported ^= MPB_ATTRIB_RAID5;
+		}
+		if (not_supported & MPB_ATTRIB_RAIDCNG) {
+			dprintf("\t\tMPB_ATTRIB_RAIDCNG\n");
+			not_supported ^= MPB_ATTRIB_RAIDCNG;
+		}
+		if (not_supported & MPB_ATTRIB_BBM) {
+			dprintf("\t\tMPB_ATTRIB_BBM\n");
+		not_supported ^= MPB_ATTRIB_BBM;
+		}
+		if (not_supported & MPB_ATTRIB_CHECKSUM_VERIFY) {
+			dprintf("\t\tMPB_ATTRIB_CHECKSUM_VERIFY (== MPB_ATTRIB_LEGACY)\n");
+			not_supported ^= MPB_ATTRIB_CHECKSUM_VERIFY;
+		}
+		if (not_supported & MPB_ATTRIB_EXP_STRIPE_SIZE) {
+			dprintf("\t\tMPB_ATTRIB_EXP_STRIP_SIZE\n");
+			not_supported ^= MPB_ATTRIB_EXP_STRIPE_SIZE;
+		}
+		if (not_supported & MPB_ATTRIB_2TB_DISK) {
+			dprintf("\t\tMPB_ATTRIB_2TB_DISK\n");
+			not_supported ^= MPB_ATTRIB_2TB_DISK;
+		}
+		if (not_supported & MPB_ATTRIB_NEVER_USE2) {
+			dprintf("\t\tMPB_ATTRIB_NEVER_USE2\n");
+			not_supported ^= MPB_ATTRIB_NEVER_USE2;
+		}
+		if (not_supported & MPB_ATTRIB_NEVER_USE) {
+			dprintf("\t\tMPB_ATTRIB_NEVER_USE\n");
+			not_supported ^= MPB_ATTRIB_NEVER_USE;
+		}
+
+		if (not_supported)
+			dprintf("(IMSM): Unknown attributes : %x\n", not_supported);
+
+		ret_val = 0;
+	}
+
+	return ret_val;
+}
+
+static void getinfo_super_imsm(struct supertype *st, struct mdinfo *info, char *map);
+
+static void examine_super_imsm(struct supertype *st, char *homehost)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->anchor;
+	char str[MAX_SIGNATURE_LENGTH];
+	int i;
+	struct mdinfo info;
+	char nbuf[64];
+	__u32 sum;
+	__u32 reserved = imsm_reserved_sectors(super, super->disks);
+	struct dl *dl;
+	time_t creation_time;
+
+	strncpy(str, (char *)mpb->sig, MPB_SIG_LEN);
+	str[MPB_SIG_LEN-1] = '\0';
+	printf("          Magic : %s\n", str);
+	printf("        Version : %s\n", get_imsm_version(mpb));
+	printf("    Orig Family : %08x\n", __le32_to_cpu(mpb->orig_family_num));
+	printf("         Family : %08x\n", __le32_to_cpu(mpb->family_num));
+	printf("     Generation : %08x\n", __le32_to_cpu(mpb->generation_num));
+	creation_time = __le64_to_cpu(mpb->creation_time);
+	printf("  Creation Time : %.24s\n",
+		creation_time ? ctime(&creation_time) : "Unknown");
+	printf("     Attributes : ");
+	if (imsm_check_attributes(mpb->attributes))
+		printf("All supported\n");
+	else
+		printf("not supported\n");
+	getinfo_super_imsm(st, &info, NULL);
+	fname_from_uuid(st, &info, nbuf, ':');
+	printf("           UUID : %s\n", nbuf + 5);
+	sum = __le32_to_cpu(mpb->check_sum);
+	printf("       Checksum : %08x %s\n", sum,
+		__gen_imsm_checksum(mpb) == sum ? "correct" : "incorrect");
+	printf("    MPB Sectors : %d\n", mpb_sectors(mpb, super->sector_size));
+	printf("          Disks : %d\n", mpb->num_disks);
+	printf("   RAID Devices : %d\n", mpb->num_raid_devs);
+	print_imsm_disk(__get_imsm_disk(mpb, super->disks->index),
+			super->disks->index, reserved, super->sector_size);
+	if (get_imsm_bbm_log_size(super->bbm_log)) {
+		struct bbm_log *log = super->bbm_log;
+
+		printf("\n");
+		printf("Bad Block Management Log:\n");
+		printf("       Log Size : %d\n", __le32_to_cpu(mpb->bbm_log_size));
+		printf("      Signature : %x\n", __le32_to_cpu(log->signature));
+		printf("    Entry Count : %d\n", __le32_to_cpu(log->entry_count));
+	}
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct mdinfo info;
+		struct imsm_dev *dev = __get_imsm_dev(mpb, i);
+
+		super->current_vol = i;
+		getinfo_super_imsm(st, &info, NULL);
+		fname_from_uuid(st, &info, nbuf, ':');
+		print_imsm_dev(super, dev, nbuf + 5, super->disks->index);
+	}
+	for (i = 0; i < mpb->num_disks; i++) {
+		if (i == super->disks->index)
+			continue;
+		print_imsm_disk(__get_imsm_disk(mpb, i), i, reserved,
+				super->sector_size);
+	}
+
+	for (dl = super->disks; dl; dl = dl->next)
+		if (dl->index == -1)
+			print_imsm_disk(&dl->disk, -1, reserved,
+					super->sector_size);
+
+	examine_migr_rec_imsm(super);
+}
+
+static void brief_examine_super_imsm(struct supertype *st, int verbose)
+{
+	/* We just write a generic IMSM ARRAY entry */
+	struct mdinfo info;
+	char nbuf[64];
+
+	getinfo_super_imsm(st, &info, NULL);
+	fname_from_uuid(st, &info, nbuf, ':');
+	printf("ARRAY metadata=imsm UUID=%s\n", nbuf + 5);
+}
+
+static void brief_examine_subarrays_imsm(struct supertype *st, int verbose)
+{
+	/* We just write a generic IMSM ARRAY entry */
+	struct mdinfo info;
+	char nbuf[64];
+	char nbuf1[64];
+	struct intel_super *super = st->sb;
+	int i;
+
+	if (!super->anchor->num_raid_devs)
+		return;
+
+	getinfo_super_imsm(st, &info, NULL);
+	fname_from_uuid(st, &info, nbuf, ':');
+	for (i = 0; i < super->anchor->num_raid_devs; i++) {
+		struct imsm_dev *dev = get_imsm_dev(super, i);
+
+		super->current_vol = i;
+		getinfo_super_imsm(st, &info, NULL);
+		fname_from_uuid(st, &info, nbuf1, ':');
+		printf("ARRAY /dev/md/%.16s container=%s member=%d UUID=%s\n",
+		       dev->volume, nbuf + 5, i, nbuf1 + 5);
+	}
+}
+
+static void export_examine_super_imsm(struct supertype *st)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->anchor;
+	struct mdinfo info;
+	char nbuf[64];
+
+	getinfo_super_imsm(st, &info, NULL);
+	fname_from_uuid(st, &info, nbuf, ':');
+	printf("MD_METADATA=imsm\n");
+	printf("MD_LEVEL=container\n");
+	printf("MD_UUID=%s\n", nbuf+5);
+	printf("MD_DEVICES=%u\n", mpb->num_disks);
+	printf("MD_CREATION_TIME=%llu\n", __le64_to_cpu(mpb->creation_time));
+}
+
+static void detail_super_imsm(struct supertype *st, char *homehost,
+			      char *subarray)
+{
+	struct mdinfo info;
+	char nbuf[64];
+	struct intel_super *super = st->sb;
+	int temp_vol = super->current_vol;
+
+	if (subarray)
+		super->current_vol = strtoul(subarray, NULL, 10);
+
+	getinfo_super_imsm(st, &info, NULL);
+	fname_from_uuid(st, &info, nbuf, ':');
+	printf("\n              UUID : %s\n", nbuf + 5);
+
+	super->current_vol = temp_vol;
+}
+
+static void brief_detail_super_imsm(struct supertype *st, char *subarray)
+{
+	struct mdinfo info;
+	char nbuf[64];
+	struct intel_super *super = st->sb;
+	int temp_vol = super->current_vol;
+
+	if (subarray)
+		super->current_vol = strtoul(subarray, NULL, 10);
+
+	getinfo_super_imsm(st, &info, NULL);
+	fname_from_uuid(st, &info, nbuf, ':');
+	printf(" UUID=%s", nbuf + 5);
+
+	super->current_vol = temp_vol;
+}
+
+static int imsm_read_serial(int fd, char *devname, __u8 *serial,
+			    size_t serial_buf_len);
+static void fd2devname(int fd, char *name);
+
+static int ahci_enumerate_ports(const char *hba_path, int port_count, int host_base, int verbose)
+{
+	/* dump an unsorted list of devices attached to AHCI Intel storage
+	 * controller, as well as non-connected ports
+	 */
+	int hba_len = strlen(hba_path) + 1;
+	struct dirent *ent;
+	DIR *dir;
+	char *path = NULL;
+	int err = 0;
+	unsigned long port_mask = (1 << port_count) - 1;
+
+	if (port_count > (int)sizeof(port_mask) * 8) {
+		if (verbose > 0)
+			pr_err("port_count %d out of range\n", port_count);
+		return 2;
+	}
+
+	/* scroll through /sys/dev/block looking for devices attached to
+	 * this hba
+	 */
+	dir = opendir("/sys/dev/block");
+	if (!dir)
+		return 1;
+
+	for (ent = readdir(dir); ent; ent = readdir(dir)) {
+		int fd;
+		char model[64];
+		char vendor[64];
+		char buf[1024];
+		int major, minor;
+		char device[PATH_MAX];
+		char *c;
+		int port;
+		int type;
+
+		if (sscanf(ent->d_name, "%d:%d", &major, &minor) != 2)
+			continue;
+		path = devt_to_devpath(makedev(major, minor), 1, NULL);
+		if (!path)
+			continue;
+		if (!path_attached_to_hba(path, hba_path)) {
+			free(path);
+			path = NULL;
+			continue;
+		}
+
+		/* retrieve the scsi device */
+		if (!devt_to_devpath(makedev(major, minor), 1, device)) {
+			if (verbose > 0)
+				pr_err("failed to get device\n");
+			err = 2;
+			break;
+		}
+		if (devpath_to_char(device, "type", buf, sizeof(buf), 0)) {
+			err = 2;
+			break;
+		}
+		type = strtoul(buf, NULL, 10);
+
+		/* if it's not a disk print the vendor and model */
+		if (!(type == 0 || type == 7 || type == 14)) {
+			vendor[0] = '\0';
+			model[0] = '\0';
+
+			if (devpath_to_char(device, "vendor", buf,
+					    sizeof(buf), 0) == 0) {
+				strncpy(vendor, buf, sizeof(vendor));
+				vendor[sizeof(vendor) - 1] = '\0';
+				c = (char *) &vendor[sizeof(vendor) - 1];
+				while (isspace(*c) || *c == '\0')
+					*c-- = '\0';
+
+			}
+
+			if (devpath_to_char(device, "model", buf,
+					    sizeof(buf), 0) == 0) {
+				strncpy(model, buf, sizeof(model));
+				model[sizeof(model) - 1] = '\0';
+				c = (char *) &model[sizeof(model) - 1];
+				while (isspace(*c) || *c == '\0')
+					*c-- = '\0';
+			}
+
+			if (vendor[0] && model[0])
+				sprintf(buf, "%.64s %.64s", vendor, model);
+			else
+				switch (type) { /* numbers from hald/linux/device.c */
+				case 1: sprintf(buf, "tape"); break;
+				case 2: sprintf(buf, "printer"); break;
+				case 3: sprintf(buf, "processor"); break;
+				case 4:
+				case 5: sprintf(buf, "cdrom"); break;
+				case 6: sprintf(buf, "scanner"); break;
+				case 8: sprintf(buf, "media_changer"); break;
+				case 9: sprintf(buf, "comm"); break;
+				case 12: sprintf(buf, "raid"); break;
+				default: sprintf(buf, "unknown");
+				}
+		} else
+			buf[0] = '\0';
+
+		/* chop device path to 'host%d' and calculate the port number */
+		c = strchr(&path[hba_len], '/');
+		if (!c) {
+			if (verbose > 0)
+				pr_err("%s - invalid path name\n", path + hba_len);
+			err = 2;
+			break;
+		}
+		*c = '\0';
+		if ((sscanf(&path[hba_len], "ata%d", &port) == 1) ||
+		   ((sscanf(&path[hba_len], "host%d", &port) == 1)))
+			port -= host_base;
+		else {
+			if (verbose > 0) {
+				*c = '/'; /* repair the full string */
+				pr_err("failed to determine port number for %s\n",
+					path);
+			}
+			err = 2;
+			break;
+		}
+
+		/* mark this port as used */
+		port_mask &= ~(1 << port);
+
+		/* print out the device information */
+		if (buf[0]) {
+			printf("          Port%d : - non-disk device (%s) -\n", port, buf);
+			continue;
+		}
+
+		fd = dev_open(ent->d_name, O_RDONLY);
+		if (!is_fd_valid(fd))
+			printf("          Port%d : - disk info unavailable -\n", port);
+		else {
+			fd2devname(fd, buf);
+			printf("          Port%d : %s", port, buf);
+			if (imsm_read_serial(fd, NULL, (__u8 *)buf,
+					     sizeof(buf)) == 0)
+				printf(" (%s)\n", buf);
+			else
+				printf(" ()\n");
+			close(fd);
+		}
+		free(path);
+		path = NULL;
+	}
+	if (path)
+		free(path);
+	if (dir)
+		closedir(dir);
+	if (err == 0) {
+		int i;
+
+		for (i = 0; i < port_count; i++)
+			if (port_mask & (1 << i))
+				printf("          Port%d : - no device attached -\n", i);
+	}
+
+	return err;
+}
+
+static int print_nvme_info(struct sys_dev *hba)
+{
+	struct dirent *ent;
+	DIR *dir;
+
+	dir = opendir("/sys/block/");
+	if (!dir)
+		return 1;
+
+	for (ent = readdir(dir); ent; ent = readdir(dir)) {
+		char ns_path[PATH_MAX];
+		char cntrl_path[PATH_MAX];
+		char buf[PATH_MAX];
+		int fd = -1;
+
+		if (!strstr(ent->d_name, "nvme"))
+			goto skip;
+
+		fd = open_dev(ent->d_name);
+		if (!is_fd_valid(fd))
+			goto skip;
+
+		if (!diskfd_to_devpath(fd, 0, ns_path) ||
+		    !diskfd_to_devpath(fd, 1, cntrl_path))
+			goto skip;
+
+		if (!path_attached_to_hba(cntrl_path, hba->path))
+			goto skip;
+
+		if (!imsm_is_nvme_namespace_supported(fd, 0))
+			goto skip;
+
+		fd2devname(fd, buf);
+		if (hba->type == SYS_DEV_VMD)
+			printf(" NVMe under VMD : %s", buf);
+		else if (hba->type == SYS_DEV_NVME)
+			printf("    NVMe Device : %s", buf);
+
+		if (!imsm_read_serial(fd, NULL, (__u8 *)buf,
+				      sizeof(buf)))
+			printf(" (%s)\n", buf);
+		else
+			printf("()\n");
+
+skip:
+		close_fd(&fd);
+	}
+
+	closedir(dir);
+	return 0;
+}
+
+static void print_found_intel_controllers(struct sys_dev *elem)
+{
+	for (; elem; elem = elem->next) {
+		pr_err("found Intel(R) ");
+		if (elem->type == SYS_DEV_SATA)
+			fprintf(stderr, "SATA ");
+		else if (elem->type == SYS_DEV_SAS)
+			fprintf(stderr, "SAS ");
+		else if (elem->type == SYS_DEV_NVME)
+			fprintf(stderr, "NVMe ");
+
+		if (elem->type == SYS_DEV_VMD)
+			fprintf(stderr, "VMD domain");
+		else
+			fprintf(stderr, "RAID controller");
+
+		if (elem->pci_id)
+			fprintf(stderr, " at %s", elem->pci_id);
+		fprintf(stderr, ".\n");
+	}
+	fflush(stderr);
+}
+
+static int ahci_get_port_count(const char *hba_path, int *port_count)
+{
+	struct dirent *ent;
+	DIR *dir;
+	int host_base = -1;
+
+	*port_count = 0;
+	if ((dir = opendir(hba_path)) == NULL)
+		return -1;
+
+	for (ent = readdir(dir); ent; ent = readdir(dir)) {
+		int host;
+
+		if ((sscanf(ent->d_name, "ata%d", &host) != 1) &&
+		   ((sscanf(ent->d_name, "host%d", &host) != 1)))
+			continue;
+		if (*port_count == 0)
+			host_base = host;
+		else if (host < host_base)
+			host_base = host;
+
+		if (host + 1 > *port_count + host_base)
+			*port_count = host + 1 - host_base;
+	}
+	closedir(dir);
+	return host_base;
+}
+
+static void print_imsm_capability(const struct imsm_orom *orom)
+{
+	printf("       Platform : Intel(R) ");
+	if (orom->capabilities == 0 && orom->driver_features == 0)
+		printf("Matrix Storage Manager\n");
+	else if (imsm_orom_is_enterprise(orom) && orom->major_ver >= 6)
+		printf("Virtual RAID on CPU\n");
+	else
+		printf("Rapid Storage Technology%s\n",
+			imsm_orom_is_enterprise(orom) ? " enterprise" : "");
+	if (orom->major_ver || orom->minor_ver || orom->hotfix_ver || orom->build)
+		printf("        Version : %d.%d.%d.%d\n", orom->major_ver,
+				orom->minor_ver, orom->hotfix_ver, orom->build);
+	printf("    RAID Levels :%s%s%s%s%s\n",
+	       imsm_orom_has_raid0(orom) ? " raid0" : "",
+	       imsm_orom_has_raid1(orom) ? " raid1" : "",
+	       imsm_orom_has_raid1e(orom) ? " raid1e" : "",
+	       imsm_orom_has_raid10(orom) ? " raid10" : "",
+	       imsm_orom_has_raid5(orom) ? " raid5" : "");
+	printf("    Chunk Sizes :%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
+	       imsm_orom_has_chunk(orom, 2) ? " 2k" : "",
+	       imsm_orom_has_chunk(orom, 4) ? " 4k" : "",
+	       imsm_orom_has_chunk(orom, 8) ? " 8k" : "",
+	       imsm_orom_has_chunk(orom, 16) ? " 16k" : "",
+	       imsm_orom_has_chunk(orom, 32) ? " 32k" : "",
+	       imsm_orom_has_chunk(orom, 64) ? " 64k" : "",
+	       imsm_orom_has_chunk(orom, 128) ? " 128k" : "",
+	       imsm_orom_has_chunk(orom, 256) ? " 256k" : "",
+	       imsm_orom_has_chunk(orom, 512) ? " 512k" : "",
+	       imsm_orom_has_chunk(orom, 1024*1) ? " 1M" : "",
+	       imsm_orom_has_chunk(orom, 1024*2) ? " 2M" : "",
+	       imsm_orom_has_chunk(orom, 1024*4) ? " 4M" : "",
+	       imsm_orom_has_chunk(orom, 1024*8) ? " 8M" : "",
+	       imsm_orom_has_chunk(orom, 1024*16) ? " 16M" : "",
+	       imsm_orom_has_chunk(orom, 1024*32) ? " 32M" : "",
+	       imsm_orom_has_chunk(orom, 1024*64) ? " 64M" : "");
+	printf("    2TB volumes :%s supported\n",
+	       (orom->attr & IMSM_OROM_ATTR_2TB)?"":" not");
+	printf("      2TB disks :%s supported\n",
+	       (orom->attr & IMSM_OROM_ATTR_2TB_DISK)?"":" not");
+	printf("      Max Disks : %d\n", orom->tds);
+	printf("    Max Volumes : %d per array, %d per %s\n",
+	       orom->vpa, orom->vphba,
+	       imsm_orom_is_nvme(orom) ? "platform" : "controller");
+	return;
+}
+
+static void print_imsm_capability_export(const struct imsm_orom *orom)
+{
+	printf("MD_FIRMWARE_TYPE=imsm\n");
+	if (orom->major_ver || orom->minor_ver || orom->hotfix_ver || orom->build)
+		printf("IMSM_VERSION=%d.%d.%d.%d\n", orom->major_ver, orom->minor_ver,
+				orom->hotfix_ver, orom->build);
+	printf("IMSM_SUPPORTED_RAID_LEVELS=%s%s%s%s%s\n",
+			imsm_orom_has_raid0(orom) ? "raid0 " : "",
+			imsm_orom_has_raid1(orom) ? "raid1 " : "",
+			imsm_orom_has_raid1e(orom) ? "raid1e " : "",
+			imsm_orom_has_raid5(orom) ? "raid10 " : "",
+			imsm_orom_has_raid10(orom) ? "raid5 " : "");
+	printf("IMSM_SUPPORTED_CHUNK_SIZES=%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
+			imsm_orom_has_chunk(orom, 2) ? "2k " : "",
+			imsm_orom_has_chunk(orom, 4) ? "4k " : "",
+			imsm_orom_has_chunk(orom, 8) ? "8k " : "",
+			imsm_orom_has_chunk(orom, 16) ? "16k " : "",
+			imsm_orom_has_chunk(orom, 32) ? "32k " : "",
+			imsm_orom_has_chunk(orom, 64) ? "64k " : "",
+			imsm_orom_has_chunk(orom, 128) ? "128k " : "",
+			imsm_orom_has_chunk(orom, 256) ? "256k " : "",
+			imsm_orom_has_chunk(orom, 512) ? "512k " : "",
+			imsm_orom_has_chunk(orom, 1024*1) ? "1M " : "",
+			imsm_orom_has_chunk(orom, 1024*2) ? "2M " : "",
+			imsm_orom_has_chunk(orom, 1024*4) ? "4M " : "",
+			imsm_orom_has_chunk(orom, 1024*8) ? "8M " : "",
+			imsm_orom_has_chunk(orom, 1024*16) ? "16M " : "",
+			imsm_orom_has_chunk(orom, 1024*32) ? "32M " : "",
+			imsm_orom_has_chunk(orom, 1024*64) ? "64M " : "");
+	printf("IMSM_2TB_VOLUMES=%s\n",(orom->attr & IMSM_OROM_ATTR_2TB) ? "yes" : "no");
+	printf("IMSM_2TB_DISKS=%s\n",(orom->attr & IMSM_OROM_ATTR_2TB_DISK) ? "yes" : "no");
+	printf("IMSM_MAX_DISKS=%d\n",orom->tds);
+	printf("IMSM_MAX_VOLUMES_PER_ARRAY=%d\n",orom->vpa);
+	printf("IMSM_MAX_VOLUMES_PER_CONTROLLER=%d\n",orom->vphba);
+}
+
+static int detail_platform_imsm(int verbose, int enumerate_only, char *controller_path)
+{
+	/* There are two components to imsm platform support, the ahci SATA
+	 * controller and the option-rom.  To find the SATA controller we
+	 * simply look in /sys/bus/pci/drivers/ahci to see if an ahci
+	 * controller with the Intel vendor id is present.  This approach
+	 * allows mdadm to leverage the kernel's ahci detection logic, with the
+	 * caveat that if ahci.ko is not loaded mdadm will not be able to
+	 * detect platform raid capabilities.  The option-rom resides in a
+	 * platform "Adapter ROM".  We scan for its signature to retrieve the
+	 * platform capabilities.  If raid support is disabled in the BIOS the
+	 * option-rom capability structure will not be available.
+	 */
+	struct sys_dev *list, *hba;
+	int host_base = 0;
+	int port_count = 0;
+	int result=1;
+
+	if (enumerate_only) {
+		if (check_env("IMSM_NO_PLATFORM"))
+			return 0;
+		list = find_intel_devices();
+		if (!list)
+			return 2;
+		for (hba = list; hba; hba = hba->next) {
+			if (find_imsm_capability(hba)) {
+				result = 0;
+				break;
+			}
+			else
+				result = 2;
+		}
+		return result;
+	}
+
+	list = find_intel_devices();
+	if (!list) {
+		if (verbose > 0)
+			pr_err("no active Intel(R) RAID controller found.\n");
+		return 2;
+	} else if (verbose > 0)
+		print_found_intel_controllers(list);
+
+	for (hba = list; hba; hba = hba->next) {
+		if (controller_path && (compare_paths(hba->path, controller_path) != 0))
+			continue;
+		if (!find_imsm_capability(hba)) {
+			char buf[PATH_MAX];
+			pr_err("imsm capabilities not found for controller: %s (type %s)\n",
+				  hba->type == SYS_DEV_VMD ? vmd_domain_to_controller(hba, buf) : hba->path,
+				  get_sys_dev_type(hba->type));
+			continue;
+		}
+		result = 0;
+	}
+
+	if (controller_path && result == 1) {
+		pr_err("no active Intel(R) RAID controller found under %s\n",
+				controller_path);
+		return result;
+	}
+
+	const struct orom_entry *entry;
+
+	for (entry = orom_entries; entry; entry = entry->next) {
+		if (entry->type == SYS_DEV_VMD) {
+			print_imsm_capability(&entry->orom);
+			printf(" 3rd party NVMe :%s supported\n",
+			    imsm_orom_has_tpv_support(&entry->orom)?"":" not");
+			for (hba = list; hba; hba = hba->next) {
+				if (hba->type == SYS_DEV_VMD) {
+					char buf[PATH_MAX];
+					printf(" I/O Controller : %s (%s)\n",
+						vmd_domain_to_controller(hba, buf), get_sys_dev_type(hba->type));
+					if (print_nvme_info(hba)) {
+						if (verbose > 0)
+							pr_err("failed to get devices attached to VMD domain.\n");
+						result |= 2;
+					}
+				}
+			}
+			printf("\n");
+			continue;
+		}
+
+		print_imsm_capability(&entry->orom);
+		if (entry->type == SYS_DEV_NVME) {
+			for (hba = list; hba; hba = hba->next) {
+				if (hba->type == SYS_DEV_NVME)
+					print_nvme_info(hba);
+			}
+			printf("\n");
+			continue;
+		}
+
+		struct devid_list *devid;
+		for (devid = entry->devid_list; devid; devid = devid->next) {
+			hba = device_by_id(devid->devid);
+			if (!hba)
+				continue;
+
+			printf(" I/O Controller : %s (%s)\n",
+				hba->path, get_sys_dev_type(hba->type));
+			if (hba->type == SYS_DEV_SATA) {
+				host_base = ahci_get_port_count(hba->path, &port_count);
+				if (ahci_enumerate_ports(hba->path, port_count, host_base, verbose)) {
+					if (verbose > 0)
+						pr_err("failed to enumerate ports on SATA controller at %s.\n", hba->pci_id);
+					result |= 2;
+				}
+			}
+		}
+		printf("\n");
+	}
+
+	return result;
+}
+
+static int export_detail_platform_imsm(int verbose, char *controller_path)
+{
+	struct sys_dev *list, *hba;
+	int result=1;
+
+	list = find_intel_devices();
+	if (!list) {
+		if (verbose > 0)
+			pr_err("IMSM_DETAIL_PLATFORM_ERROR=NO_INTEL_DEVICES\n");
+		result = 2;
+		return result;
+	}
+
+	for (hba = list; hba; hba = hba->next) {
+		if (controller_path && (compare_paths(hba->path,controller_path) != 0))
+			continue;
+		if (!find_imsm_capability(hba) && verbose > 0) {
+			char buf[PATH_MAX];
+			pr_err("IMSM_DETAIL_PLATFORM_ERROR=NO_IMSM_CAPABLE_DEVICE_UNDER_%s\n",
+			hba->type == SYS_DEV_VMD ? vmd_domain_to_controller(hba, buf) : hba->path);
+		}
+		else
+			result = 0;
+	}
+
+	const struct orom_entry *entry;
+
+	for (entry = orom_entries; entry; entry = entry->next) {
+		if (entry->type == SYS_DEV_VMD) {
+			for (hba = list; hba; hba = hba->next)
+				print_imsm_capability_export(&entry->orom);
+			continue;
+		}
+		print_imsm_capability_export(&entry->orom);
+	}
+
+	return result;
+}
+
+static int match_home_imsm(struct supertype *st, char *homehost)
+{
+	/* the imsm metadata format does not specify any host
+	 * identification information.  We return -1 since we can never
+	 * confirm nor deny whether a given array is "meant" for this
+	 * host.  We rely on compare_super and the 'family_num' fields to
+	 * exclude member disks that do not belong, and we rely on
+	 * mdadm.conf to specify the arrays that should be assembled.
+	 * Auto-assembly may still pick up "foreign" arrays.
+	 */
+
+	return -1;
+}
+
+static void uuid_from_super_imsm(struct supertype *st, int uuid[4])
+{
+	/* The uuid returned here is used for:
+	 *  uuid to put into bitmap file (Create, Grow)
+	 *  uuid for backup header when saving critical section (Grow)
+	 *  comparing uuids when re-adding a device into an array
+	 *    In these cases the uuid required is that of the data-array,
+	 *    not the device-set.
+	 *  uuid to recognise same set when adding a missing device back
+	 *    to an array.   This is a uuid for the device-set.
+	 *
+	 * For each of these we can make do with a truncated
+	 * or hashed uuid rather than the original, as long as
+	 * everyone agrees.
+	 * In each case the uuid required is that of the data-array,
+	 * not the device-set.
+	 */
+	/* imsm does not track uuid's so we synthesis one using sha1 on
+	 * - The signature (Which is constant for all imsm array, but no matter)
+	 * - the orig_family_num of the container
+	 * - the index number of the volume
+	 * - the 'serial' number of the volume.
+	 * Hopefully these are all constant.
+	 */
+	struct intel_super *super = st->sb;
+
+	char buf[20];
+	struct sha1_ctx ctx;
+	struct imsm_dev *dev = NULL;
+	__u32 family_num;
+
+	/* some mdadm versions failed to set ->orig_family_num, in which
+	 * case fall back to ->family_num.  orig_family_num will be
+	 * fixed up with the first metadata update.
+	 */
+	family_num = super->anchor->orig_family_num;
+	if (family_num == 0)
+		family_num = super->anchor->family_num;
+	sha1_init_ctx(&ctx);
+	sha1_process_bytes(super->anchor->sig, MPB_SIG_LEN, &ctx);
+	sha1_process_bytes(&family_num, sizeof(__u32), &ctx);
+	if (super->current_vol >= 0)
+		dev = get_imsm_dev(super, super->current_vol);
+	if (dev) {
+		__u32 vol = super->current_vol;
+		sha1_process_bytes(&vol, sizeof(vol), &ctx);
+		sha1_process_bytes(dev->volume, MAX_RAID_SERIAL_LEN, &ctx);
+	}
+	sha1_finish_ctx(&ctx, buf);
+	memcpy(uuid, buf, 4*4);
+}
+
+#if 0
+static void
+get_imsm_numerical_version(struct imsm_super *mpb, int *m, int *p)
+{
+	__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++;
+	}
+
+	*m = strtol(minor, NULL, 0);
+	*p = strtol(patch, NULL, 0);
+}
+#endif
+
+static __u32 migr_strip_blocks_resync(struct imsm_dev *dev)
+{
+	/* migr_strip_size when repairing or initializing parity */
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	__u32 chunk = __le32_to_cpu(map->blocks_per_strip);
+
+	switch (get_imsm_raid_level(map)) {
+	case 5:
+	case 10:
+		return chunk;
+	default:
+		return 128*1024 >> 9;
+	}
+}
+
+static __u32 migr_strip_blocks_rebuild(struct imsm_dev *dev)
+{
+	/* migr_strip_size when rebuilding a degraded disk, no idea why
+	 * this is different than migr_strip_size_resync(), but it's good
+	 * to be compatible
+	 */
+	struct imsm_map *map = get_imsm_map(dev, MAP_1);
+	__u32 chunk = __le32_to_cpu(map->blocks_per_strip);
+
+	switch (get_imsm_raid_level(map)) {
+	case 1:
+	case 10:
+		if (map->num_members % map->num_domains == 0)
+			return 128*1024 >> 9;
+		else
+			return chunk;
+	case 5:
+		return max((__u32) 64*1024 >> 9, chunk);
+	default:
+		return 128*1024 >> 9;
+	}
+}
+
+static __u32 num_stripes_per_unit_resync(struct imsm_dev *dev)
+{
+	struct imsm_map *lo = get_imsm_map(dev, MAP_0);
+	struct imsm_map *hi = get_imsm_map(dev, MAP_1);
+	__u32 lo_chunk = __le32_to_cpu(lo->blocks_per_strip);
+	__u32 hi_chunk = __le32_to_cpu(hi->blocks_per_strip);
+
+	return max((__u32) 1, hi_chunk / lo_chunk);
+}
+
+static __u32 num_stripes_per_unit_rebuild(struct imsm_dev *dev)
+{
+	struct imsm_map *lo = get_imsm_map(dev, MAP_0);
+	int level = get_imsm_raid_level(lo);
+
+	if (level == 1 || level == 10) {
+		struct imsm_map *hi = get_imsm_map(dev, MAP_1);
+
+		return hi->num_domains;
+	} else
+		return num_stripes_per_unit_resync(dev);
+}
+
+static unsigned long long calc_component_size(struct imsm_map *map,
+					      struct imsm_dev *dev)
+{
+	unsigned long long component_size;
+	unsigned long long dev_size = imsm_dev_size(dev);
+	long long calc_dev_size = 0;
+	unsigned int member_disks = imsm_num_data_members(map);
+
+	if (member_disks == 0)
+		return 0;
+
+	component_size = per_dev_array_size(map);
+	calc_dev_size = component_size * member_disks;
+
+	/* Component size is rounded to 1MB so difference between size from
+	 * metadata and size calculated from num_data_stripes equals up to
+	 * 2048 blocks per each device. If the difference is higher it means
+	 * that array size was expanded and num_data_stripes was not updated.
+	 */
+	if (llabs(calc_dev_size - (long long)dev_size) >
+	    (1 << SECT_PER_MB_SHIFT) * member_disks) {
+		component_size = dev_size / member_disks;
+		dprintf("Invalid num_data_stripes in metadata; expected=%llu, found=%llu\n",
+			component_size / map->blocks_per_strip,
+			num_data_stripes(map));
+	}
+
+	return component_size;
+}
+
+static __u32 parity_segment_depth(struct imsm_dev *dev)
+{
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	__u32 chunk =  __le32_to_cpu(map->blocks_per_strip);
+
+	switch(get_imsm_raid_level(map)) {
+	case 1:
+	case 10:
+		return chunk * map->num_domains;
+	case 5:
+		return chunk * map->num_members;
+	default:
+		return chunk;
+	}
+}
+
+static __u32 map_migr_block(struct imsm_dev *dev, __u32 block)
+{
+	struct imsm_map *map = get_imsm_map(dev, MAP_1);
+	__u32 chunk = __le32_to_cpu(map->blocks_per_strip);
+	__u32 strip = block / chunk;
+
+	switch (get_imsm_raid_level(map)) {
+	case 1:
+	case 10: {
+		__u32 vol_strip = (strip * map->num_domains) + 1;
+		__u32 vol_stripe = vol_strip / map->num_members;
+
+		return vol_stripe * chunk + block % chunk;
+	} case 5: {
+		__u32 stripe = strip / (map->num_members - 1);
+
+		return stripe * chunk + block % chunk;
+	}
+	default:
+		return 0;
+	}
+}
+
+static __u64 blocks_per_migr_unit(struct intel_super *super,
+				  struct imsm_dev *dev)
+{
+	/* calculate the conversion factor between per member 'blocks'
+	 * (md/{resync,rebuild}_start) and imsm migration units, return
+	 * 0 for the 'not migrating' and 'unsupported migration' cases
+	 */
+	if (!dev->vol.migr_state)
+		return 0;
+
+	switch (migr_type(dev)) {
+	case MIGR_GEN_MIGR: {
+		struct migr_record *migr_rec = super->migr_rec;
+		return __le32_to_cpu(migr_rec->blocks_per_unit);
+	}
+	case MIGR_VERIFY:
+	case MIGR_REPAIR:
+	case MIGR_INIT: {
+		struct imsm_map *map = get_imsm_map(dev, MAP_0);
+		__u32 stripes_per_unit;
+		__u32 blocks_per_unit;
+		__u32 parity_depth;
+		__u32 migr_chunk;
+		__u32 block_map;
+		__u32 block_rel;
+		__u32 segment;
+		__u32 stripe;
+		__u8  disks;
+
+		/* yes, this is really the translation of migr_units to
+		 * per-member blocks in the 'resync' case
+		 */
+		stripes_per_unit = num_stripes_per_unit_resync(dev);
+		migr_chunk = migr_strip_blocks_resync(dev);
+		disks = imsm_num_data_members(map);
+		blocks_per_unit = stripes_per_unit * migr_chunk * disks;
+		stripe = __le16_to_cpu(map->blocks_per_strip) * disks;
+		segment = blocks_per_unit / stripe;
+		block_rel = blocks_per_unit - segment * stripe;
+		parity_depth = parity_segment_depth(dev);
+		block_map = map_migr_block(dev, block_rel);
+		return block_map + parity_depth * segment;
+	}
+	case MIGR_REBUILD: {
+		__u32 stripes_per_unit;
+		__u32 migr_chunk;
+
+		stripes_per_unit = num_stripes_per_unit_rebuild(dev);
+		migr_chunk = migr_strip_blocks_rebuild(dev);
+		return migr_chunk * stripes_per_unit;
+	}
+	case MIGR_STATE_CHANGE:
+	default:
+		return 0;
+	}
+}
+
+static int imsm_level_to_layout(int level)
+{
+	switch (level) {
+	case 0:
+	case 1:
+		return 0;
+	case 5:
+	case 6:
+		return ALGORITHM_LEFT_ASYMMETRIC;
+	case 10:
+		return 0x102;
+	}
+	return UnSet;
+}
+
+/*******************************************************************************
+ * Function:	read_imsm_migr_rec
+ * Description: Function reads imsm migration record from last sector of disk
+ * Parameters:
+ *	fd	: disk descriptor
+ *	super	: metadata info
+ * Returns:
+ *	 0 : success,
+ *	-1 : fail
+ ******************************************************************************/
+static int read_imsm_migr_rec(int fd, struct intel_super *super)
+{
+	int ret_val = -1;
+	unsigned int sector_size = super->sector_size;
+	unsigned long long dsize;
+
+	get_dev_size(fd, NULL, &dsize);
+	if (lseek64(fd, dsize - (sector_size*MIGR_REC_SECTOR_POSITION),
+		   SEEK_SET) < 0) {
+		pr_err("Cannot seek to anchor block: %s\n",
+		       strerror(errno));
+		goto out;
+	}
+	if ((unsigned int)read(fd, super->migr_rec_buf,
+	    MIGR_REC_BUF_SECTORS*sector_size) !=
+	    MIGR_REC_BUF_SECTORS*sector_size) {
+		pr_err("Cannot read migr record block: %s\n",
+		       strerror(errno));
+		goto out;
+	}
+	ret_val = 0;
+	if (sector_size == 4096)
+		convert_from_4k_imsm_migr_rec(super);
+
+out:
+	return ret_val;
+}
+
+static struct imsm_dev *imsm_get_device_during_migration(
+	struct intel_super *super)
+{
+
+	struct intel_dev *dv;
+
+	for (dv = super->devlist; dv; dv = dv->next) {
+		if (is_gen_migration(dv->dev))
+			return dv->dev;
+	}
+	return NULL;
+}
+
+/*******************************************************************************
+ * Function:	load_imsm_migr_rec
+ * Description:	Function reads imsm migration record (it is stored at the last
+ *		sector of disk)
+ * Parameters:
+ *	super	: imsm internal array info
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ *	-2 : no migration in progress
+ ******************************************************************************/
+static int load_imsm_migr_rec(struct intel_super *super)
+{
+	struct dl *dl;
+	char nm[30];
+	int retval = -1;
+	int fd = -1;
+	struct imsm_dev *dev;
+	struct imsm_map *map;
+	int slot = -1;
+	int keep_fd = 1;
+
+	/* find map under migration */
+	dev = imsm_get_device_during_migration(super);
+	/* nothing to load,no migration in progress?
+	*/
+	if (dev == NULL)
+		return -2;
+
+	map = get_imsm_map(dev, MAP_0);
+	if (!map)
+		return -1;
+
+	for (dl = super->disks; dl; dl = dl->next) {
+		/* skip spare and failed disks
+		 */
+		if (dl->index < 0)
+			continue;
+		/* read only from one of the first two slots
+		 */
+		slot = get_imsm_disk_slot(map, dl->index);
+		if (slot > 1 || slot < 0)
+			continue;
+
+		if (!is_fd_valid(dl->fd)) {
+			sprintf(nm, "%d:%d", dl->major, dl->minor);
+			fd = dev_open(nm, O_RDONLY);
+
+			if (is_fd_valid(fd)) {
+				keep_fd = 0;
+				break;
+			}
+		} else {
+			fd = dl->fd;
+			break;
+		}
+	}
+
+	if (!is_fd_valid(fd))
+		return retval;
+	retval = read_imsm_migr_rec(fd, super);
+	if (!keep_fd)
+		close(fd);
+
+	return retval;
+}
+
+/*******************************************************************************
+ * function: imsm_create_metadata_checkpoint_update
+ * Description: It creates update for checkpoint change.
+ * Parameters:
+ *	super	: imsm internal array info
+ *	u	: pointer to prepared update
+ * Returns:
+ *	Uptate length.
+ *	If length is equal to 0, input pointer u contains no update
+ ******************************************************************************/
+static int imsm_create_metadata_checkpoint_update(
+	struct intel_super *super,
+	struct imsm_update_general_migration_checkpoint **u)
+{
+
+	int update_memory_size = 0;
+
+	dprintf("(enter)\n");
+
+	if (u == NULL)
+		return 0;
+	*u = NULL;
+
+	/* size of all update data without anchor */
+	update_memory_size =
+		sizeof(struct imsm_update_general_migration_checkpoint);
+
+	*u = xcalloc(1, update_memory_size);
+	if (*u == NULL) {
+		dprintf("error: cannot get memory\n");
+		return 0;
+	}
+	(*u)->type = update_general_migration_checkpoint;
+	(*u)->curr_migr_unit = current_migr_unit(super->migr_rec);
+	dprintf("prepared for %llu\n", (unsigned long long)(*u)->curr_migr_unit);
+
+	return update_memory_size;
+}
+
+static void imsm_update_metadata_locally(struct supertype *st,
+					 void *buf, int len);
+
+/*******************************************************************************
+ * Function:	write_imsm_migr_rec
+ * Description:	Function writes imsm migration record
+ *		(at the last sector of disk)
+ * Parameters:
+ *	super	: imsm internal array info
+ * Returns:
+ *	 0 : success
+ *	-1 : if fail
+ ******************************************************************************/
+static int write_imsm_migr_rec(struct supertype *st)
+{
+	struct intel_super *super = st->sb;
+	unsigned int sector_size = super->sector_size;
+	unsigned long long dsize;
+	int retval = -1;
+	struct dl *sd;
+	int len;
+	struct imsm_update_general_migration_checkpoint *u;
+	struct imsm_dev *dev;
+	struct imsm_map *map;
+
+	/* find map under migration */
+	dev = imsm_get_device_during_migration(super);
+	/* if no migration, write buffer anyway to clear migr_record
+	 * on disk based on first available device
+	*/
+	if (dev == NULL)
+		dev = get_imsm_dev(super, super->current_vol < 0 ? 0 :
+					  super->current_vol);
+
+	map = get_imsm_map(dev, MAP_0);
+
+	if (sector_size == 4096)
+		convert_to_4k_imsm_migr_rec(super);
+	for (sd = super->disks ; sd ; sd = sd->next) {
+		int slot = -1;
+
+		/* skip failed and spare devices */
+		if (sd->index < 0)
+			continue;
+		/* write to 2 first slots only */
+		if (map)
+			slot = get_imsm_disk_slot(map, sd->index);
+		if (map == NULL || slot > 1 || slot < 0)
+			continue;
+
+		get_dev_size(sd->fd, NULL, &dsize);
+		if (lseek64(sd->fd, dsize - (MIGR_REC_SECTOR_POSITION *
+		    sector_size),
+		    SEEK_SET) < 0) {
+			pr_err("Cannot seek to anchor block: %s\n",
+			       strerror(errno));
+			goto out;
+		}
+		if ((unsigned int)write(sd->fd, super->migr_rec_buf,
+		    MIGR_REC_BUF_SECTORS*sector_size) !=
+		    MIGR_REC_BUF_SECTORS*sector_size) {
+			pr_err("Cannot write migr record block: %s\n",
+			       strerror(errno));
+			goto out;
+		}
+	}
+	if (sector_size == 4096)
+		convert_from_4k_imsm_migr_rec(super);
+	/* update checkpoint information in metadata */
+	len = imsm_create_metadata_checkpoint_update(super, &u);
+	if (len <= 0) {
+		dprintf("imsm: Cannot prepare update\n");
+		goto out;
+	}
+	/* update metadata locally */
+	imsm_update_metadata_locally(st, u, len);
+	/* and possibly remotely */
+	if (st->update_tail) {
+		append_metadata_update(st, u, len);
+		/* during reshape we do all work inside metadata handler
+		 * manage_reshape(), so metadata update has to be triggered
+		 * insida it
+		 */
+		flush_metadata_updates(st);
+		st->update_tail = &st->updates;
+	} else
+		free(u);
+
+	retval = 0;
+ out:
+	return retval;
+}
+
+/* spare/missing disks activations are not allowe when
+ * array/container performs reshape operation, because
+ * all arrays in container works on the same disks set
+ */
+int imsm_reshape_blocks_arrays_changes(struct intel_super *super)
+{
+	int rv = 0;
+	struct intel_dev *i_dev;
+	struct imsm_dev *dev;
+
+	/* check whole container
+	 */
+	for (i_dev = super->devlist; i_dev; i_dev = i_dev->next) {
+		dev = i_dev->dev;
+		if (is_gen_migration(dev)) {
+			/* No repair during any migration in container
+			 */
+			rv = 1;
+			break;
+		}
+	}
+	return rv;
+}
+static unsigned long long imsm_component_size_alignment_check(int level,
+					      int chunk_size,
+					      unsigned int sector_size,
+					      unsigned long long component_size)
+{
+	unsigned int component_size_alignment;
+
+	/* check component size alignment
+	*/
+	component_size_alignment = component_size % (chunk_size/sector_size);
+
+	dprintf("(Level: %i, chunk_size = %i, component_size = %llu), component_size_alignment = %u\n",
+		level, chunk_size, component_size,
+		component_size_alignment);
+
+	if (component_size_alignment && (level != 1) && (level != UnSet)) {
+		dprintf("imsm: reported component size aligned from %llu ",
+			component_size);
+		component_size -= component_size_alignment;
+		dprintf_cont("to %llu (%i).\n",
+			component_size, component_size_alignment);
+	}
+
+	return component_size;
+}
+
+/*******************************************************************************
+ * Function:	get_bitmap_header_sector
+ * Description:	Returns the sector where the bitmap header is placed.
+ * Parameters:
+ *	st		: supertype information
+ *	dev_idx		: index of the device with bitmap
+ *
+ * Returns:
+ *	 The sector where the bitmap header is placed
+ ******************************************************************************/
+static unsigned long long get_bitmap_header_sector(struct intel_super *super,
+						   int dev_idx)
+{
+	struct imsm_dev *dev = get_imsm_dev(super, dev_idx);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+
+	if (!super->sector_size) {
+		dprintf("sector size is not set\n");
+		return 0;
+	}
+
+	return pba_of_lba0(map) + calc_component_size(map, dev) +
+	       (IMSM_BITMAP_HEADER_OFFSET / super->sector_size);
+}
+
+/*******************************************************************************
+ * Function:	get_bitmap_sector
+ * Description:	Returns the sector where the bitmap is placed.
+ * Parameters:
+ *	st		: supertype information
+ *	dev_idx		: index of the device with bitmap
+ *
+ * Returns:
+ *	 The sector where the bitmap is placed
+ ******************************************************************************/
+static unsigned long long get_bitmap_sector(struct intel_super *super,
+					    int dev_idx)
+{
+	if (!super->sector_size) {
+		dprintf("sector size is not set\n");
+		return 0;
+	}
+
+	return get_bitmap_header_sector(super, dev_idx) +
+	       (IMSM_BITMAP_HEADER_SIZE / super->sector_size);
+}
+
+static unsigned long long get_ppl_sector(struct intel_super *super, int dev_idx)
+{
+	struct imsm_dev *dev = get_imsm_dev(super, dev_idx);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+
+	return pba_of_lba0(map) +
+	       (num_data_stripes(map) * map->blocks_per_strip);
+}
+
+static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info, char *dmap)
+{
+	struct intel_super *super = st->sb;
+	struct migr_record *migr_rec = super->migr_rec;
+	struct imsm_dev *dev = get_imsm_dev(super, super->current_vol);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	struct imsm_map *prev_map = get_imsm_map(dev, MAP_1);
+	struct imsm_map *map_to_analyse = map;
+	struct dl *dl;
+	int map_disks = info->array.raid_disks;
+
+	memset(info, 0, sizeof(*info));
+	if (prev_map)
+		map_to_analyse = prev_map;
+
+	dl = super->current_disk;
+
+	info->container_member	  = super->current_vol;
+	info->array.raid_disks    = map->num_members;
+	info->array.level	  = get_imsm_raid_level(map_to_analyse);
+	info->array.layout	  = imsm_level_to_layout(info->array.level);
+	info->array.md_minor	  = -1;
+	info->array.ctime	  = 0;
+	info->array.utime	  = 0;
+	info->array.chunk_size	  =
+		__le16_to_cpu(map_to_analyse->blocks_per_strip) << 9;
+	info->array.state	  = !(dev->vol.dirty & RAIDVOL_DIRTY);
+	info->custom_array_size   = imsm_dev_size(dev);
+	info->recovery_blocked = imsm_reshape_blocks_arrays_changes(st->sb);
+
+	if (is_gen_migration(dev)) {
+		/*
+		 * device prev_map should be added if it is in the middle
+		 * of migration
+		 */
+		assert(prev_map);
+
+		info->reshape_active = 1;
+		info->new_level = get_imsm_raid_level(map);
+		info->new_layout = imsm_level_to_layout(info->new_level);
+		info->new_chunk = __le16_to_cpu(map->blocks_per_strip) << 9;
+		info->delta_disks = map->num_members - prev_map->num_members;
+		if (info->delta_disks) {
+			/* this needs to be applied to every array
+			 * in the container.
+			 */
+			info->reshape_active = CONTAINER_RESHAPE;
+		}
+		/* We shape information that we give to md might have to be
+		 * modify to cope with md's requirement for reshaping arrays.
+		 * For example, when reshaping a RAID0, md requires it to be
+		 * presented as a degraded RAID4.
+		 * Also if a RAID0 is migrating to a RAID5 we need to specify
+		 * the array as already being RAID5, but the 'before' layout
+		 * is a RAID4-like layout.
+		 */
+		switch (info->array.level) {
+		case 0:
+			switch(info->new_level) {
+			case 0:
+				/* conversion is happening as RAID4 */
+				info->array.level = 4;
+				info->array.raid_disks += 1;
+				break;
+			case 5:
+				/* conversion is happening as RAID5 */
+				info->array.level = 5;
+				info->array.layout = ALGORITHM_PARITY_N;
+				info->delta_disks -= 1;
+				break;
+			default:
+				/* FIXME error message */
+				info->array.level = UnSet;
+				break;
+			}
+			break;
+		}
+	} else {
+		info->new_level = UnSet;
+		info->new_layout = UnSet;
+		info->new_chunk = info->array.chunk_size;
+		info->delta_disks = 0;
+	}
+
+	if (dl) {
+		info->disk.major = dl->major;
+		info->disk.minor = dl->minor;
+		info->disk.number = dl->index;
+		info->disk.raid_disk = get_imsm_disk_slot(map_to_analyse,
+							  dl->index);
+	}
+
+	info->data_offset	  = pba_of_lba0(map_to_analyse);
+	info->component_size = calc_component_size(map, dev);
+	info->component_size = imsm_component_size_alignment_check(
+							info->array.level,
+							info->array.chunk_size,
+							super->sector_size,
+							info->component_size);
+	info->bb.supported = 1;
+
+	memset(info->uuid, 0, sizeof(info->uuid));
+	info->recovery_start = MaxSector;
+
+	if (info->array.level == 5 &&
+	    (dev->rwh_policy == RWH_DISTRIBUTED ||
+	     dev->rwh_policy == RWH_MULTIPLE_DISTRIBUTED)) {
+		info->consistency_policy = CONSISTENCY_POLICY_PPL;
+		info->ppl_sector = get_ppl_sector(super, super->current_vol);
+		if (dev->rwh_policy == RWH_MULTIPLE_DISTRIBUTED)
+			info->ppl_size = MULTIPLE_PPL_AREA_SIZE_IMSM >> 9;
+		else
+			info->ppl_size = (PPL_HEADER_SIZE + PPL_ENTRY_SPACE)
+					  >> 9;
+	} else if (info->array.level <= 0) {
+		info->consistency_policy = CONSISTENCY_POLICY_NONE;
+	} else {
+		if (dev->rwh_policy == RWH_BITMAP) {
+			info->bitmap_offset = get_bitmap_sector(super, super->current_vol);
+			info->consistency_policy = CONSISTENCY_POLICY_BITMAP;
+		} else {
+			info->consistency_policy = CONSISTENCY_POLICY_RESYNC;
+		}
+	}
+
+	info->reshape_progress = 0;
+	info->resync_start = MaxSector;
+	if ((map_to_analyse->map_state == IMSM_T_STATE_UNINITIALIZED ||
+	    !(info->array.state & 1)) &&
+	    imsm_reshape_blocks_arrays_changes(super) == 0) {
+		info->resync_start = 0;
+	}
+	if (dev->vol.migr_state) {
+		switch (migr_type(dev)) {
+		case MIGR_REPAIR:
+		case MIGR_INIT: {
+			__u64 blocks_per_unit = blocks_per_migr_unit(super,
+								     dev);
+			__u64 units = vol_curr_migr_unit(dev);
+
+			info->resync_start = blocks_per_unit * units;
+			break;
+		}
+		case MIGR_GEN_MIGR: {
+			__u64 blocks_per_unit = blocks_per_migr_unit(super,
+								     dev);
+			__u64 units = current_migr_unit(migr_rec);
+			int used_disks;
+
+			if (__le32_to_cpu(migr_rec->ascending_migr) &&
+			    (units <
+				(get_num_migr_units(migr_rec)-1)) &&
+			    (super->migr_rec->rec_status ==
+					__cpu_to_le32(UNIT_SRC_IN_CP_AREA)))
+				units++;
+
+			info->reshape_progress = blocks_per_unit * units;
+
+			dprintf("IMSM: General Migration checkpoint : %llu (%llu) -> read reshape progress : %llu\n",
+				(unsigned long long)units,
+				(unsigned long long)blocks_per_unit,
+				info->reshape_progress);
+
+			used_disks = imsm_num_data_members(prev_map);
+			if (used_disks > 0) {
+				info->custom_array_size = per_dev_array_size(map) *
+					used_disks;
+			}
+		}
+		case MIGR_VERIFY:
+			/* we could emulate the checkpointing of
+			 * 'sync_action=check' migrations, but for now
+			 * we just immediately complete them
+			 */
+		case MIGR_REBUILD:
+			/* this is handled by container_content_imsm() */
+		case MIGR_STATE_CHANGE:
+			/* FIXME handle other migrations */
+		default:
+			/* we are not dirty, so... */
+			info->resync_start = MaxSector;
+		}
+	}
+
+	strncpy(info->name, (char *) dev->volume, MAX_RAID_SERIAL_LEN);
+	info->name[MAX_RAID_SERIAL_LEN] = 0;
+
+	info->array.major_version = -1;
+	info->array.minor_version = -2;
+	sprintf(info->text_version, "/%s/%d", st->container_devnm, info->container_member);
+	info->safe_mode_delay = 4000;  /* 4 secs like the Matrix driver */
+	uuid_from_super_imsm(st, info->uuid);
+
+	if (dmap) {
+		int i, j;
+		for (i=0; i<map_disks; i++) {
+			dmap[i] = 0;
+			if (i < info->array.raid_disks) {
+				struct imsm_disk *dsk;
+				j = get_imsm_disk_idx(dev, i, MAP_X);
+				dsk = get_imsm_disk(super, j);
+				if (dsk && (dsk->status & CONFIGURED_DISK))
+					dmap[i] = 1;
+			}
+		}
+	}
+}
+
+static __u8 imsm_check_degraded(struct intel_super *super, struct imsm_dev *dev,
+				int failed, int look_in_map);
+
+static int imsm_count_failed(struct intel_super *super, struct imsm_dev *dev,
+			     int look_in_map);
+
+static void manage_second_map(struct intel_super *super, struct imsm_dev *dev)
+{
+	if (is_gen_migration(dev)) {
+		int failed;
+		__u8 map_state;
+		struct imsm_map *map2 = get_imsm_map(dev, MAP_1);
+
+		failed = imsm_count_failed(super, dev, MAP_1);
+		map_state = imsm_check_degraded(super, dev, failed, MAP_1);
+		if (map2->map_state != map_state) {
+			map2->map_state = map_state;
+			super->updates_pending++;
+		}
+	}
+}
+
+static struct imsm_disk *get_imsm_missing(struct intel_super *super, __u8 index)
+{
+	struct dl *d;
+
+	for (d = super->missing; d; d = d->next)
+		if (d->index == index)
+			return &d->disk;
+	return NULL;
+}
+
+static void getinfo_super_imsm(struct supertype *st, struct mdinfo *info, char *map)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_disk *disk;
+	int map_disks = info->array.raid_disks;
+	int max_enough = -1;
+	int i;
+	struct imsm_super *mpb;
+
+	if (super->current_vol >= 0) {
+		getinfo_super_imsm_volume(st, info, map);
+		return;
+	}
+	memset(info, 0, sizeof(*info));
+
+	/* Set raid_disks to zero so that Assemble will always pull in valid
+	 * spares
+	 */
+	info->array.raid_disks    = 0;
+	info->array.level         = LEVEL_CONTAINER;
+	info->array.layout        = 0;
+	info->array.md_minor      = -1;
+	info->array.ctime         = 0; /* N/A for imsm */
+	info->array.utime         = 0;
+	info->array.chunk_size    = 0;
+
+	info->disk.major = 0;
+	info->disk.minor = 0;
+	info->disk.raid_disk = -1;
+	info->reshape_active = 0;
+	info->array.major_version = -1;
+	info->array.minor_version = -2;
+	strcpy(info->text_version, "imsm");
+	info->safe_mode_delay = 0;
+	info->disk.number = -1;
+	info->disk.state = 0;
+	info->name[0] = 0;
+	info->recovery_start = MaxSector;
+	info->recovery_blocked = imsm_reshape_blocks_arrays_changes(st->sb);
+	info->bb.supported = 1;
+
+	/* do we have the all the insync disks that we expect? */
+	mpb = super->anchor;
+	info->events = __le32_to_cpu(mpb->generation_num);
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev = get_imsm_dev(super, i);
+		int failed, enough, j, missing = 0;
+		struct imsm_map *map;
+		__u8 state;
+
+		failed = imsm_count_failed(super, dev, MAP_0);
+		state = imsm_check_degraded(super, dev, failed, MAP_0);
+		map = get_imsm_map(dev, MAP_0);
+
+		/* any newly missing disks?
+		 * (catches single-degraded vs double-degraded)
+		 */
+		for (j = 0; j < map->num_members; j++) {
+			__u32 ord = get_imsm_ord_tbl_ent(dev, j, MAP_0);
+			__u32 idx = ord_to_idx(ord);
+
+			if (super->disks && super->disks->index == (int)idx)
+				info->disk.raid_disk = j;
+
+			if (!(ord & IMSM_ORD_REBUILD) &&
+			    get_imsm_missing(super, idx)) {
+				missing = 1;
+				break;
+			}
+		}
+
+		if (state == IMSM_T_STATE_FAILED)
+			enough = -1;
+		else if (state == IMSM_T_STATE_DEGRADED &&
+			 (state != map->map_state || missing))
+			enough = 0;
+		else /* we're normal, or already degraded */
+			enough = 1;
+		if (is_gen_migration(dev) && missing) {
+			/* during general migration we need all disks
+			 * that process is running on.
+			 * No new missing disk is allowed.
+			 */
+			max_enough = -1;
+			enough = -1;
+			/* no more checks necessary
+			 */
+			break;
+		}
+		/* in the missing/failed disk case check to see
+		 * if at least one array is runnable
+		 */
+		max_enough = max(max_enough, enough);
+	}
+	dprintf("enough: %d\n", max_enough);
+	info->container_enough = max_enough;
+
+	if (super->disks) {
+		__u32 reserved = imsm_reserved_sectors(super, super->disks);
+
+		disk = &super->disks->disk;
+		info->data_offset = total_blocks(&super->disks->disk) - reserved;
+		info->component_size = reserved;
+		info->disk.state  = is_configured(disk) ? (1 << MD_DISK_ACTIVE) : 0;
+		/* we don't change info->disk.raid_disk here because
+		 * this state will be finalized in mdmon after we have
+		 * found the 'most fresh' version of the metadata
+		 */
+		info->disk.state |= is_failed(disk) ? (1 << MD_DISK_FAULTY) : 0;
+		info->disk.state |= (is_spare(disk) || is_journal(disk)) ?
+				    0 : (1 << MD_DISK_SYNC);
+	}
+
+	/* only call uuid_from_super_imsm when this disk is part of a populated container,
+	 * ->compare_super may have updated the 'num_raid_devs' field for spares
+	 */
+	if (info->disk.state & (1 << MD_DISK_SYNC) || super->anchor->num_raid_devs)
+		uuid_from_super_imsm(st, info->uuid);
+	else
+		memcpy(info->uuid, uuid_zero, sizeof(uuid_zero));
+
+	/* I don't know how to compute 'map' on imsm, so use safe default */
+	if (map) {
+		int i;
+		for (i = 0; i < map_disks; i++)
+			map[i] = 1;
+	}
+
+}
+
+/* allocates memory and fills disk in mdinfo structure
+ * for each disk in array */
+struct mdinfo *getinfo_super_disks_imsm(struct supertype *st)
+{
+	struct mdinfo *mddev;
+	struct intel_super *super = st->sb;
+	struct imsm_disk *disk;
+	int count = 0;
+	struct dl *dl;
+	if (!super || !super->disks)
+		return NULL;
+	dl = super->disks;
+	mddev = xcalloc(1, sizeof(*mddev));
+	while (dl) {
+		struct mdinfo *tmp;
+		disk = &dl->disk;
+		tmp = xcalloc(1, sizeof(*tmp));
+		if (mddev->devs)
+			tmp->next = mddev->devs;
+		mddev->devs = tmp;
+		tmp->disk.number = count++;
+		tmp->disk.major = dl->major;
+		tmp->disk.minor = dl->minor;
+		tmp->disk.state = is_configured(disk) ?
+				  (1 << MD_DISK_ACTIVE) : 0;
+		tmp->disk.state |= is_failed(disk) ? (1 << MD_DISK_FAULTY) : 0;
+		tmp->disk.state |= is_spare(disk) ? 0 : (1 << MD_DISK_SYNC);
+		tmp->disk.raid_disk = -1;
+		dl = dl->next;
+	}
+	return mddev;
+}
+
+static int update_super_imsm(struct supertype *st, struct mdinfo *info,
+			     char *update, char *devname, int verbose,
+			     int uuid_set, char *homehost)
+{
+	/* For 'assemble' and 'force' we need to return non-zero if any
+	 * change was made.  For others, the return value is ignored.
+	 * Update options are:
+	 *  force-one : This device looks a bit old but needs to be included,
+	 *        update age info appropriately.
+	 *  assemble: clear any 'faulty' flag to allow this device to
+	 *		be assembled.
+	 *  force-array: Array is degraded but being forced, mark it clean
+	 *	   if that will be needed to assemble it.
+	 *
+	 *  newdev:  not used ????
+	 *  grow:  Array has gained a new device - this is currently for
+	 *		linear only
+	 *  resync: mark as dirty so a resync will happen.
+	 *  name:  update the name - preserving the homehost
+	 *  uuid:  Change the uuid of the array to match watch is given
+	 *
+	 * Following are not relevant for this imsm:
+	 *  sparc2.2 : update from old dodgey metadata
+	 *  super-minor: change the preferred_minor number
+	 *  summaries:  update redundant counters.
+	 *  homehost:  update the recorded homehost
+	 *  _reshape_progress: record new reshape_progress position.
+	 */
+	int rv = 1;
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb;
+
+	/* we can only update container info */
+	if (!super || super->current_vol >= 0 || !super->anchor)
+		return 1;
+
+	mpb = super->anchor;
+
+	if (strcmp(update, "uuid") == 0) {
+		/* We take this to mean that the family_num should be updated.
+		 * However that is much smaller than the uuid so we cannot really
+		 * allow an explicit uuid to be given.  And it is hard to reliably
+		 * know if one was.
+		 * So if !uuid_set we know the current uuid is random and just used
+		 * the first 'int' and copy it to the other 3 positions.
+		 * Otherwise we require the 4 'int's to be the same as would be the
+		 * case if we are using a random uuid.  So an explicit uuid will be
+		 * accepted as long as all for ints are the same... which shouldn't hurt
+		 */
+		if (!uuid_set) {
+			info->uuid[1] = info->uuid[2] = info->uuid[3] = info->uuid[0];
+			rv = 0;
+		} else {
+			if (info->uuid[0] != info->uuid[1] ||
+			    info->uuid[1] != info->uuid[2] ||
+			    info->uuid[2] != info->uuid[3])
+				rv = -1;
+			else
+				rv = 0;
+		}
+		if (rv == 0)
+			mpb->orig_family_num = info->uuid[0];
+	} else if (strcmp(update, "assemble") == 0)
+		rv = 0;
+	else
+		rv = -1;
+
+	/* successful update? recompute checksum */
+	if (rv == 0)
+		mpb->check_sum = __le32_to_cpu(__gen_imsm_checksum(mpb));
+
+	return rv;
+}
+
+static size_t disks_to_mpb_size(int disks)
+{
+	size_t size;
+
+	size = sizeof(struct imsm_super);
+	size += (disks - 1) * sizeof(struct imsm_disk);
+	size += 2 * sizeof(struct imsm_dev);
+	/* up to 2 maps per raid device (-2 for imsm_maps in imsm_dev */
+	size += (4 - 2) * sizeof(struct imsm_map);
+	/* 4 possible disk_ord_tbl's */
+	size += 4 * (disks - 1) * sizeof(__u32);
+	/* maximum bbm log */
+	size += sizeof(struct bbm_log);
+
+	return size;
+}
+
+static __u64 avail_size_imsm(struct supertype *st, __u64 devsize,
+			     unsigned long long data_offset)
+{
+	if (devsize < (MPB_SECTOR_CNT + IMSM_RESERVED_SECTORS))
+		return 0;
+
+	return devsize - (MPB_SECTOR_CNT + IMSM_RESERVED_SECTORS);
+}
+
+static void free_devlist(struct intel_super *super)
+{
+	struct intel_dev *dv;
+
+	while (super->devlist) {
+		dv = super->devlist->next;
+		free(super->devlist->dev);
+		free(super->devlist);
+		super->devlist = dv;
+	}
+}
+
+static void imsm_copy_dev(struct imsm_dev *dest, struct imsm_dev *src)
+{
+	memcpy(dest, src, sizeof_imsm_dev(src, 0));
+}
+
+static int compare_super_imsm(struct supertype *st, struct supertype *tst,
+			      int verbose)
+{
+	/*  return:
+	 *  0 same, or first was empty, and second was copied
+	 *  1 sb are different
+	 */
+	struct intel_super *first = st->sb;
+	struct intel_super *sec = tst->sb;
+
+	if (!first) {
+		st->sb = tst->sb;
+		tst->sb = NULL;
+		return 0;
+	}
+
+	/* in platform dependent environment test if the disks
+	 * use the same Intel hba
+	 * if not on Intel hba at all, allow anything.
+	 * doesn't check HBAs if num_raid_devs is not set, as it means
+	 * it is a free floating spare, and all spares regardless of HBA type
+	 * will fall into separate container during the assembly
+	 */
+	if (first->hba && sec->hba && first->anchor->num_raid_devs != 0) {
+		if (first->hba->type != sec->hba->type) {
+			if (verbose)
+				pr_err("HBAs of devices do not match %s != %s\n",
+				       get_sys_dev_type(first->hba->type),
+				       get_sys_dev_type(sec->hba->type));
+			return 1;
+		}
+		if (first->orom != sec->orom) {
+			if (verbose)
+				pr_err("HBAs of devices do not match %s != %s\n",
+				       first->hba->pci_id, sec->hba->pci_id);
+			return 1;
+		}
+	}
+
+	if (first->anchor->num_raid_devs > 0 &&
+	    sec->anchor->num_raid_devs > 0) {
+		/* Determine if these disks might ever have been
+		 * related.  Further disambiguation can only take place
+		 * in load_super_imsm_all
+		 */
+		__u32 first_family = first->anchor->orig_family_num;
+		__u32 sec_family = sec->anchor->orig_family_num;
+
+		if (memcmp(first->anchor->sig, sec->anchor->sig,
+			   MAX_SIGNATURE_LENGTH) != 0)
+			return 1;
+
+		if (first_family == 0)
+			first_family = first->anchor->family_num;
+		if (sec_family == 0)
+			sec_family = sec->anchor->family_num;
+
+		if (first_family != sec_family)
+			return 1;
+
+	}
+
+	/* if an anchor does not have num_raid_devs set then it is a free
+	* floating spare. don't assosiate spare with any array, as during assembly
+	* spares shall fall into separate container, from which they can be moved
+	* when necessary
+	*/
+	if (first->anchor->num_raid_devs ^ sec->anchor->num_raid_devs)
+		return 1;
+
+	return 0;
+}
+
+static void fd2devname(int fd, char *name)
+{
+	char *nm;
+
+	nm = fd2kname(fd);
+	if (!nm)
+		return;
+
+	snprintf(name, MAX_RAID_SERIAL_LEN, "/dev/%s", nm);
+}
+
+static int nvme_get_serial(int fd, void *buf, size_t buf_len)
+{
+	char path[PATH_MAX];
+	char *name = fd2kname(fd);
+
+	if (!name)
+		return 1;
+
+	if (strncmp(name, "nvme", 4) != 0)
+		return 1;
+
+	if (!diskfd_to_devpath(fd, 1, path))
+		return 1;
+
+	return devpath_to_char(path, "serial", buf, buf_len, 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, size_t serial_buf_len)
+{
+	char buf[50];
+	int rv;
+	size_t len;
+	char *dest;
+	char *src;
+	unsigned int i;
+
+	memset(buf, 0, sizeof(buf));
+
+	rv = nvme_get_serial(fd, buf, sizeof(buf));
+
+	if (rv)
+		rv = scsi_get_serial(fd, buf, sizeof(buf));
+
+	if (rv && check_env("IMSM_DEVNAME_AS_SERIAL")) {
+		memset(serial, 0, MAX_RAID_SERIAL_LEN);
+		fd2devname(fd, (char *) serial);
+		return 0;
+	}
+
+	if (rv != 0) {
+		if (devname)
+			pr_err("Failed to retrieve serial for %s\n",
+			       devname);
+		return rv;
+	}
+
+	/* trim all whitespace and non-printable characters and convert
+	 * ':' to ';'
+	 */
+	for (i = 0, dest = buf; i < sizeof(buf) && buf[i]; i++) {
+		src = &buf[i];
+		if (*src > 0x20) {
+			/* ':' is reserved for use in placeholder serial
+			 * numbers for missing disks
+			 */
+			if (*src == ':')
+				*dest++ = ';';
+			else
+				*dest++ = *src;
+		}
+	}
+	len = dest - buf;
+	dest = buf;
+
+	if (len > serial_buf_len) {
+		/* truncate leading characters */
+		dest += len - serial_buf_len;
+		len = serial_buf_len;
+	}
+
+	memset(serial, 0, serial_buf_len);
+	memcpy(serial, dest, len);
+
+	return 0;
+}
+
+static int serialcmp(__u8 *s1, __u8 *s2)
+{
+	return strncmp((char *) s1, (char *) s2, MAX_RAID_SERIAL_LEN);
+}
+
+static void serialcpy(__u8 *dest, __u8 *src)
+{
+	strncpy((char *) dest, (char *) src, MAX_RAID_SERIAL_LEN);
+}
+
+static struct dl *serial_to_dl(__u8 *serial, struct intel_super *super)
+{
+	struct dl *dl;
+
+	for (dl = super->disks; dl; dl = dl->next)
+		if (serialcmp(dl->serial, serial) == 0)
+			break;
+
+	return dl;
+}
+
+static struct imsm_disk *
+__serial_to_disk(__u8 *serial, struct imsm_super *mpb, int *idx)
+{
+	int i;
+
+	for (i = 0; i < mpb->num_disks; i++) {
+		struct imsm_disk *disk = __get_imsm_disk(mpb, i);
+
+		if (serialcmp(disk->serial, serial) == 0) {
+			if (idx)
+				*idx = i;
+			return disk;
+		}
+	}
+
+	return NULL;
+}
+
+static int
+load_imsm_disk(int fd, struct intel_super *super, char *devname, int keep_fd)
+{
+	struct imsm_disk *disk;
+	struct dl *dl;
+	struct stat stb;
+	int rv;
+	char name[40];
+	__u8 serial[MAX_RAID_SERIAL_LEN];
+
+	rv = imsm_read_serial(fd, devname, serial, MAX_RAID_SERIAL_LEN);
+
+	if (rv != 0)
+		return 2;
+
+	dl = xcalloc(1, 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;
+	assert(super->disks == NULL);
+	super->disks = dl;
+	serialcpy(dl->serial, serial);
+	dl->index = -2;
+	dl->e = NULL;
+	fd2devname(fd, name);
+	if (devname)
+		dl->devname = xstrdup(devname);
+	else
+		dl->devname = xstrdup(name);
+
+	/* look up this disk's index in the current anchor */
+	disk = __serial_to_disk(dl->serial, super->anchor, &dl->index);
+	if (disk) {
+		dl->disk = *disk;
+		/* only set index on disks that are a member of a
+		 * populated contianer, i.e. one with raid_devs
+		 */
+		if (is_failed(&dl->disk))
+			dl->index = -2;
+		else if (is_spare(&dl->disk) || is_journal(&dl->disk))
+			dl->index = -1;
+	}
+
+	return 0;
+}
+
+/* When migrating map0 contains the 'destination' state while map1
+ * contains the current state.  When not migrating map0 contains the
+ * current state.  This routine assumes that map[0].map_state is set to
+ * the current array state before being called.
+ *
+ * Migration is indicated by one of the following states
+ * 1/ Idle (migr_state=0 map0state=normal||unitialized||degraded||failed)
+ * 2/ Initialize (migr_state=1 migr_type=MIGR_INIT map0state=normal
+ *    map1state=unitialized)
+ * 3/ Repair (Resync) (migr_state=1 migr_type=MIGR_REPAIR  map0state=normal
+ *    map1state=normal)
+ * 4/ Rebuild (migr_state=1 migr_type=MIGR_REBUILD map0state=normal
+ *    map1state=degraded)
+ * 5/ Migration (mig_state=1 migr_type=MIGR_GEN_MIGR map0state=normal
+ *    map1state=normal)
+ */
+static void migrate(struct imsm_dev *dev, struct intel_super *super,
+		    __u8 to_state, int migr_type)
+{
+	struct imsm_map *dest;
+	struct imsm_map *src = get_imsm_map(dev, MAP_0);
+
+	dev->vol.migr_state = 1;
+	set_migr_type(dev, migr_type);
+	set_vol_curr_migr_unit(dev, 0);
+	dest = get_imsm_map(dev, MAP_1);
+
+	/* duplicate and then set the target end state in map[0] */
+	memcpy(dest, src, sizeof_imsm_map(src));
+	if (migr_type == MIGR_GEN_MIGR) {
+		__u32 ord;
+		int i;
+
+		for (i = 0; i < src->num_members; i++) {
+			ord = __le32_to_cpu(src->disk_ord_tbl[i]);
+			set_imsm_ord_tbl_ent(src, i, ord_to_idx(ord));
+		}
+	}
+
+	if (migr_type == MIGR_GEN_MIGR)
+		/* Clear migration record */
+		memset(super->migr_rec, 0, sizeof(struct migr_record));
+
+	src->map_state = to_state;
+}
+
+static void end_migration(struct imsm_dev *dev, struct intel_super *super,
+			  __u8 map_state)
+{
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	struct imsm_map *prev = get_imsm_map(dev, dev->vol.migr_state == 0 ?
+						    MAP_0 : MAP_1);
+	int i, j;
+
+	/* merge any IMSM_ORD_REBUILD bits that were not successfully
+	 * completed in the last migration.
+	 *
+	 * FIXME add support for raid-level-migration
+	 */
+	if (map_state != map->map_state && (is_gen_migration(dev) == false) &&
+	    prev->map_state != IMSM_T_STATE_UNINITIALIZED) {
+		/* when final map state is other than expected
+		 * merge maps (not for migration)
+		 */
+		int failed;
+
+		for (i = 0; i < prev->num_members; i++)
+			for (j = 0; j < map->num_members; j++)
+				/* during online capacity expansion
+				 * disks position can be changed
+				 * if takeover is used
+				 */
+				if (ord_to_idx(map->disk_ord_tbl[j]) ==
+				    ord_to_idx(prev->disk_ord_tbl[i])) {
+					map->disk_ord_tbl[j] |=
+						prev->disk_ord_tbl[i];
+					break;
+				}
+		failed = imsm_count_failed(super, dev, MAP_0);
+		map_state = imsm_check_degraded(super, dev, failed, MAP_0);
+	}
+
+	dev->vol.migr_state = 0;
+	set_migr_type(dev, 0);
+	set_vol_curr_migr_unit(dev, 0);
+	map->map_state = map_state;
+}
+
+static int parse_raid_devices(struct intel_super *super)
+{
+	int i;
+	struct imsm_dev *dev_new;
+	size_t len, len_migr;
+	size_t max_len = 0;
+	size_t space_needed = 0;
+	struct imsm_super *mpb = super->anchor;
+
+	for (i = 0; i < super->anchor->num_raid_devs; i++) {
+		struct imsm_dev *dev_iter = __get_imsm_dev(super->anchor, i);
+		struct intel_dev *dv;
+
+		len = sizeof_imsm_dev(dev_iter, 0);
+		len_migr = sizeof_imsm_dev(dev_iter, 1);
+		if (len_migr > len)
+			space_needed += len_migr - len;
+
+		dv = xmalloc(sizeof(*dv));
+		if (max_len < len_migr)
+			max_len = len_migr;
+		if (max_len > len_migr)
+			space_needed += max_len - len_migr;
+		dev_new = xmalloc(max_len);
+		imsm_copy_dev(dev_new, dev_iter);
+		dv->dev = dev_new;
+		dv->index = i;
+		dv->next = super->devlist;
+		super->devlist = dv;
+	}
+
+	/* ensure that super->buf is large enough when all raid devices
+	 * are migrating
+	 */
+	if (__le32_to_cpu(mpb->mpb_size) + space_needed > super->len) {
+		void *buf;
+
+		len = ROUND_UP(__le32_to_cpu(mpb->mpb_size) + space_needed,
+			      super->sector_size);
+		if (posix_memalign(&buf, MAX_SECTOR_SIZE, len) != 0)
+			return 1;
+
+		memcpy(buf, super->buf, super->len);
+		memset(buf + super->len, 0, len - super->len);
+		free(super->buf);
+		super->buf = buf;
+		super->len = len;
+	}
+
+	super->extra_space += space_needed;
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	check_mpb_migr_compatibility
+ * Description:	Function checks for unsupported migration features:
+ *		- migration optimization area (pba_of_lba0)
+ *		- descending reshape (ascending_migr)
+ * Parameters:
+ *	super	: imsm metadata information
+ * Returns:
+ *	 0 : migration is compatible
+ *	-1 : migration is not compatible
+ ******************************************************************************/
+int check_mpb_migr_compatibility(struct intel_super *super)
+{
+	struct imsm_map *map0, *map1;
+	struct migr_record *migr_rec = super->migr_rec;
+	int i;
+
+	for (i = 0; i < super->anchor->num_raid_devs; i++) {
+		struct imsm_dev *dev_iter = __get_imsm_dev(super->anchor, i);
+
+		if (dev_iter &&
+		    dev_iter->vol.migr_state == 1 &&
+		    dev_iter->vol.migr_type == MIGR_GEN_MIGR) {
+			/* This device is migrating */
+			map0 = get_imsm_map(dev_iter, MAP_0);
+			map1 = get_imsm_map(dev_iter, MAP_1);
+			if (pba_of_lba0(map0) != pba_of_lba0(map1))
+				/* migration optimization area was used */
+				return -1;
+			if (migr_rec->ascending_migr == 0 &&
+			    migr_rec->dest_depth_per_unit > 0)
+				/* descending reshape not supported yet */
+				return -1;
+		}
+	}
+	return 0;
+}
+
+static void __free_imsm(struct intel_super *super, int free_disks);
+
+/* load_imsm_mpb - read matrix metadata
+ * allocates super->mpb to be freed by free_imsm
+ */
+static int load_imsm_mpb(int fd, struct intel_super *super, char *devname)
+{
+	unsigned long long dsize;
+	unsigned long long sectors;
+	unsigned int sector_size = super->sector_size;
+	struct stat;
+	struct imsm_super *anchor;
+	__u32 check_sum;
+
+	get_dev_size(fd, NULL, &dsize);
+	if (dsize < 2*sector_size) {
+		if (devname)
+			pr_err("%s: device to small for imsm\n",
+			       devname);
+		return 1;
+	}
+
+	if (lseek64(fd, dsize - (sector_size * 2), SEEK_SET) < 0) {
+		if (devname)
+			pr_err("Cannot seek to anchor block on %s: %s\n",
+			       devname, strerror(errno));
+		return 1;
+	}
+
+	if (posix_memalign((void **)&anchor, sector_size, sector_size) != 0) {
+		if (devname)
+			pr_err("Failed to allocate imsm anchor buffer on %s\n", devname);
+		return 1;
+	}
+	if ((unsigned int)read(fd, anchor, sector_size) != sector_size) {
+		if (devname)
+			pr_err("Cannot read anchor block on %s: %s\n",
+			       devname, strerror(errno));
+		free(anchor);
+		return 1;
+	}
+
+	if (strncmp((char *) anchor->sig, MPB_SIGNATURE, MPB_SIG_LEN) != 0) {
+		if (devname)
+			pr_err("no IMSM anchor on %s\n", devname);
+		free(anchor);
+		return 2;
+	}
+
+	__free_imsm(super, 0);
+	/*  reload capability and hba */
+
+	/* capability and hba must be updated with new super allocation */
+	find_intel_hba_capability(fd, super, devname);
+	super->len = ROUND_UP(anchor->mpb_size, sector_size);
+	if (posix_memalign(&super->buf, MAX_SECTOR_SIZE, super->len) != 0) {
+		if (devname)
+			pr_err("unable to allocate %zu byte mpb buffer\n",
+			       super->len);
+		free(anchor);
+		return 2;
+	}
+	memcpy(super->buf, anchor, sector_size);
+
+	sectors = mpb_sectors(anchor, sector_size) - 1;
+	free(anchor);
+
+	if (posix_memalign(&super->migr_rec_buf, MAX_SECTOR_SIZE,
+	    MIGR_REC_BUF_SECTORS*MAX_SECTOR_SIZE) != 0) {
+		pr_err("could not allocate migr_rec buffer\n");
+		free(super->buf);
+		return 2;
+	}
+	super->clean_migration_record_by_mdmon = 0;
+
+	if (!sectors) {
+		check_sum = __gen_imsm_checksum(super->anchor);
+		if (check_sum != __le32_to_cpu(super->anchor->check_sum)) {
+			if (devname)
+				pr_err("IMSM checksum %x != %x on %s\n",
+				       check_sum,
+				       __le32_to_cpu(super->anchor->check_sum),
+				       devname);
+			return 2;
+		}
+
+		return 0;
+	}
+
+	/* read the extended mpb */
+	if (lseek64(fd, dsize - (sector_size * (2 + sectors)), SEEK_SET) < 0) {
+		if (devname)
+			pr_err("Cannot seek to extended mpb on %s: %s\n",
+			       devname, strerror(errno));
+		return 1;
+	}
+
+	if ((unsigned int)read(fd, super->buf + sector_size,
+		    super->len - sector_size) != super->len - sector_size) {
+		if (devname)
+			pr_err("Cannot read extended mpb on %s: %s\n",
+			       devname, strerror(errno));
+		return 2;
+	}
+
+	check_sum = __gen_imsm_checksum(super->anchor);
+	if (check_sum != __le32_to_cpu(super->anchor->check_sum)) {
+		if (devname)
+			pr_err("IMSM checksum %x != %x on %s\n",
+			       check_sum, __le32_to_cpu(super->anchor->check_sum),
+			       devname);
+		return 3;
+	}
+
+	return 0;
+}
+
+static int read_imsm_migr_rec(int fd, struct intel_super *super);
+
+/* clears hi bits in metadata if MPB_ATTRIB_2TB_DISK not set */
+static void clear_hi(struct intel_super *super)
+{
+	struct imsm_super *mpb = super->anchor;
+	int i, n;
+	if (mpb->attributes & MPB_ATTRIB_2TB_DISK)
+		return;
+	for (i = 0; i < mpb->num_disks; ++i) {
+		struct imsm_disk *disk = &mpb->disk[i];
+		disk->total_blocks_hi = 0;
+	}
+	for (i = 0; i < mpb->num_raid_devs; ++i) {
+		struct imsm_dev *dev = get_imsm_dev(super, i);
+		if (!dev)
+			return;
+		for (n = 0; n < 2; ++n) {
+			struct imsm_map *map = get_imsm_map(dev, n);
+			if (!map)
+				continue;
+			map->pba_of_lba0_hi = 0;
+			map->blocks_per_member_hi = 0;
+			map->num_data_stripes_hi = 0;
+		}
+	}
+}
+
+static int
+load_and_parse_mpb(int fd, struct intel_super *super, char *devname, int keep_fd)
+{
+	int err;
+
+	err = load_imsm_mpb(fd, super, devname);
+	if (err)
+		return err;
+	if (super->sector_size == 4096)
+		convert_from_4k(super);
+	err = load_imsm_disk(fd, super, devname, keep_fd);
+	if (err)
+		return err;
+	err = parse_raid_devices(super);
+	if (err)
+		return err;
+	err = load_bbm_log(super);
+	clear_hi(super);
+	return err;
+}
+
+static void __free_imsm_disk(struct dl *d, int do_close)
+{
+	if (do_close)
+		close_fd(&d->fd);
+	if (d->devname)
+		free(d->devname);
+	if (d->e)
+		free(d->e);
+	free(d);
+
+}
+
+static void free_imsm_disks(struct intel_super *super)
+{
+	struct dl *d;
+
+	while (super->disks) {
+		d = super->disks;
+		super->disks = d->next;
+		__free_imsm_disk(d, 1);
+	}
+	while (super->disk_mgmt_list) {
+		d = super->disk_mgmt_list;
+		super->disk_mgmt_list = d->next;
+		__free_imsm_disk(d, 1);
+	}
+	while (super->missing) {
+		d = super->missing;
+		super->missing = d->next;
+		__free_imsm_disk(d, 1);
+	}
+
+}
+
+/* free all the pieces hanging off of a super pointer */
+static void __free_imsm(struct intel_super *super, int free_disks)
+{
+	struct intel_hba *elem, *next;
+
+	if (super->buf) {
+		free(super->buf);
+		super->buf = NULL;
+	}
+	/* unlink capability description */
+	super->orom = NULL;
+	if (super->migr_rec_buf) {
+		free(super->migr_rec_buf);
+		super->migr_rec_buf = NULL;
+	}
+	if (free_disks)
+		free_imsm_disks(super);
+	free_devlist(super);
+	elem = super->hba;
+	while (elem) {
+		if (elem->path)
+			free((void *)elem->path);
+		next = elem->next;
+		free(elem);
+		elem = next;
+	}
+	if (super->bbm_log)
+		free(super->bbm_log);
+	super->hba = NULL;
+}
+
+static void free_imsm(struct intel_super *super)
+{
+	__free_imsm(super, 1);
+	free(super->bb.entries);
+	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;
+}
+
+static struct intel_super *alloc_super(void)
+{
+	struct intel_super *super = xcalloc(1, sizeof(*super));
+
+	super->current_vol = -1;
+	super->create_offset = ~((unsigned long long) 0);
+
+	super->bb.entries = xmalloc(BBM_LOG_MAX_ENTRIES *
+				   sizeof(struct md_bb_entry));
+	if (!super->bb.entries) {
+		free(super);
+		return NULL;
+	}
+
+	return super;
+}
+
+/*
+ * find and allocate hba and OROM/EFI based on valid fd of RAID component device
+ */
+static int find_intel_hba_capability(int fd, struct intel_super *super, char *devname)
+{
+	struct sys_dev *hba_name;
+	int rv = 0;
+
+	if (is_fd_valid(fd) && test_partition(fd)) {
+		pr_err("imsm: %s is a partition, cannot be used in IMSM\n",
+		       devname);
+		return 1;
+	}
+	if (!is_fd_valid(fd) || check_env("IMSM_NO_PLATFORM")) {
+		super->orom = NULL;
+		super->hba = NULL;
+		return 0;
+	}
+	hba_name = find_disk_attached_hba(fd, NULL);
+	if (!hba_name) {
+		if (devname)
+			pr_err("%s is not attached to Intel(R) RAID controller.\n",
+			       devname);
+		return 1;
+	}
+	rv = attach_hba_to_super(super, hba_name);
+	if (rv == 2) {
+		if (devname) {
+			struct intel_hba *hba = super->hba;
+
+			pr_err("%s is attached to Intel(R) %s %s (%s),\n"
+				"    but the container is assigned to Intel(R) %s %s (",
+				devname,
+				get_sys_dev_type(hba_name->type),
+				hba_name->type == SYS_DEV_VMD ? "domain" : "RAID controller",
+				hba_name->pci_id ? : "Err!",
+				get_sys_dev_type(super->hba->type),
+				hba->type == SYS_DEV_VMD ? "domain" : "RAID controller");
+
+			while (hba) {
+				fprintf(stderr, "%s", hba->pci_id ? : "Err!");
+				if (hba->next)
+					fprintf(stderr, ", ");
+				hba = hba->next;
+			}
+			fprintf(stderr, ").\n"
+				"    Mixing devices attached to different controllers is not allowed.\n");
+		}
+		return 2;
+	}
+	super->orom = find_imsm_capability(hba_name);
+	if (!super->orom)
+		return 3;
+
+	return 0;
+}
+
+/* find_missing - helper routine for load_super_imsm_all that identifies
+ * disks that have disappeared from the system.  This routine relies on
+ * the mpb being uptodate, which it is at load time.
+ */
+static int find_missing(struct intel_super *super)
+{
+	int i;
+	struct imsm_super *mpb = super->anchor;
+	struct dl *dl;
+	struct imsm_disk *disk;
+
+	for (i = 0; i < mpb->num_disks; i++) {
+		disk = __get_imsm_disk(mpb, i);
+		dl = serial_to_dl(disk->serial, super);
+		if (dl)
+			continue;
+
+		dl = xmalloc(sizeof(*dl));
+		dl->major = 0;
+		dl->minor = 0;
+		dl->fd = -1;
+		dl->devname = xstrdup("missing");
+		dl->index = i;
+		serialcpy(dl->serial, disk->serial);
+		dl->disk = *disk;
+		dl->e = NULL;
+		dl->next = super->missing;
+		super->missing = dl;
+	}
+
+	return 0;
+}
+
+static struct intel_disk *disk_list_get(__u8 *serial, struct intel_disk *disk_list)
+{
+	struct intel_disk *idisk = disk_list;
+
+	while (idisk) {
+		if (serialcmp(idisk->disk.serial, serial) == 0)
+			break;
+		idisk = idisk->next;
+	}
+
+	return idisk;
+}
+
+static int __prep_thunderdome(struct intel_super **table, int tbl_size,
+			      struct intel_super *super,
+			      struct intel_disk **disk_list)
+{
+	struct imsm_disk *d = &super->disks->disk;
+	struct imsm_super *mpb = super->anchor;
+	int i, j;
+
+	for (i = 0; i < tbl_size; i++) {
+		struct imsm_super *tbl_mpb = table[i]->anchor;
+		struct imsm_disk *tbl_d = &table[i]->disks->disk;
+
+		if (tbl_mpb->family_num == mpb->family_num) {
+			if (tbl_mpb->check_sum == mpb->check_sum) {
+				dprintf("mpb from %d:%d matches %d:%d\n",
+					super->disks->major,
+					super->disks->minor,
+					table[i]->disks->major,
+					table[i]->disks->minor);
+				break;
+			}
+
+			if (((is_configured(d) && !is_configured(tbl_d)) ||
+			     is_configured(d) == is_configured(tbl_d)) &&
+			    tbl_mpb->generation_num < mpb->generation_num) {
+				/* current version of the mpb is a
+				 * better candidate than the one in
+				 * super_table, but copy over "cross
+				 * generational" status
+				 */
+				struct intel_disk *idisk;
+
+				dprintf("mpb from %d:%d replaces %d:%d\n",
+					super->disks->major,
+					super->disks->minor,
+					table[i]->disks->major,
+					table[i]->disks->minor);
+
+				idisk = disk_list_get(tbl_d->serial, *disk_list);
+				if (idisk && is_failed(&idisk->disk))
+					tbl_d->status |= FAILED_DISK;
+				break;
+			} else {
+				struct intel_disk *idisk;
+				struct imsm_disk *disk;
+
+				/* tbl_mpb is more up to date, but copy
+				 * over cross generational status before
+				 * returning
+				 */
+				disk = __serial_to_disk(d->serial, mpb, NULL);
+				if (disk && is_failed(disk))
+					d->status |= FAILED_DISK;
+
+				idisk = disk_list_get(d->serial, *disk_list);
+				if (idisk) {
+					idisk->owner = i;
+					if (disk && is_configured(disk))
+						idisk->disk.status |= CONFIGURED_DISK;
+				}
+
+				dprintf("mpb from %d:%d prefer %d:%d\n",
+					super->disks->major,
+					super->disks->minor,
+					table[i]->disks->major,
+					table[i]->disks->minor);
+
+				return tbl_size;
+			}
+		}
+	}
+
+	if (i >= tbl_size)
+		table[tbl_size++] = super;
+	else
+		table[i] = super;
+
+	/* update/extend the merged list of imsm_disk records */
+	for (j = 0; j < mpb->num_disks; j++) {
+		struct imsm_disk *disk = __get_imsm_disk(mpb, j);
+		struct intel_disk *idisk;
+
+		idisk = disk_list_get(disk->serial, *disk_list);
+		if (idisk) {
+			idisk->disk.status |= disk->status;
+			if (is_configured(&idisk->disk) ||
+			    is_failed(&idisk->disk))
+				idisk->disk.status &= ~(SPARE_DISK);
+		} else {
+			idisk = xcalloc(1, sizeof(*idisk));
+			idisk->owner = IMSM_UNKNOWN_OWNER;
+			idisk->disk = *disk;
+			idisk->next = *disk_list;
+			*disk_list = idisk;
+		}
+
+		if (serialcmp(idisk->disk.serial, d->serial) == 0)
+			idisk->owner = i;
+	}
+
+	return tbl_size;
+}
+
+static struct intel_super *
+validate_members(struct intel_super *super, struct intel_disk *disk_list,
+		 const int owner)
+{
+	struct imsm_super *mpb = super->anchor;
+	int ok_count = 0;
+	int i;
+
+	for (i = 0; i < mpb->num_disks; i++) {
+		struct imsm_disk *disk = __get_imsm_disk(mpb, i);
+		struct intel_disk *idisk;
+
+		idisk = disk_list_get(disk->serial, disk_list);
+		if (idisk) {
+			if (idisk->owner == owner ||
+			    idisk->owner == IMSM_UNKNOWN_OWNER)
+				ok_count++;
+			else
+				dprintf("'%.16s' owner %d != %d\n",
+					disk->serial, idisk->owner,
+					owner);
+		} else {
+			dprintf("unknown disk %x [%d]: %.16s\n",
+				__le32_to_cpu(mpb->family_num), i,
+				disk->serial);
+			break;
+		}
+	}
+
+	if (ok_count == mpb->num_disks)
+		return super;
+	return NULL;
+}
+
+static void show_conflicts(__u32 family_num, struct intel_super *super_list)
+{
+	struct intel_super *s;
+
+	for (s = super_list; s; s = s->next) {
+		if (family_num != s->anchor->family_num)
+			continue;
+		pr_err("Conflict, offlining family %#x on '%s'\n",
+			__le32_to_cpu(family_num), s->disks->devname);
+	}
+}
+
+static struct intel_super *
+imsm_thunderdome(struct intel_super **super_list, int len)
+{
+	struct intel_super *super_table[len];
+	struct intel_disk *disk_list = NULL;
+	struct intel_super *champion, *spare;
+	struct intel_super *s, **del;
+	int tbl_size = 0;
+	int conflict;
+	int i;
+
+	memset(super_table, 0, sizeof(super_table));
+	for (s = *super_list; s; s = s->next)
+		tbl_size = __prep_thunderdome(super_table, tbl_size, s, &disk_list);
+
+	for (i = 0; i < tbl_size; i++) {
+		struct imsm_disk *d;
+		struct intel_disk *idisk;
+		struct imsm_super *mpb = super_table[i]->anchor;
+
+		s = super_table[i];
+		d = &s->disks->disk;
+
+		/* 'd' must appear in merged disk list for its
+		 * configuration to be valid
+		 */
+		idisk = disk_list_get(d->serial, disk_list);
+		if (idisk && idisk->owner == i)
+			s = validate_members(s, disk_list, i);
+		else
+			s = NULL;
+
+		if (!s)
+			dprintf("marking family: %#x from %d:%d offline\n",
+				mpb->family_num,
+				super_table[i]->disks->major,
+				super_table[i]->disks->minor);
+		super_table[i] = s;
+	}
+
+	/* This is where the mdadm implementation differs from the Windows
+	 * driver which has no strict concept of a container.  We can only
+	 * assemble one family from a container, so when returning a prodigal
+	 * array member to this system the code will not be able to disambiguate
+	 * the container contents that should be assembled ("foreign" versus
+	 * "local").  It requires user intervention to set the orig_family_num
+	 * to a new value to establish a new container.  The Windows driver in
+	 * this situation fixes up the volume name in place and manages the
+	 * foreign array as an independent entity.
+	 */
+	s = NULL;
+	spare = NULL;
+	conflict = 0;
+	for (i = 0; i < tbl_size; i++) {
+		struct intel_super *tbl_ent = super_table[i];
+		int is_spare = 0;
+
+		if (!tbl_ent)
+			continue;
+
+		if (tbl_ent->anchor->num_raid_devs == 0) {
+			spare = tbl_ent;
+			is_spare = 1;
+		}
+
+		if (s && !is_spare) {
+			show_conflicts(tbl_ent->anchor->family_num, *super_list);
+			conflict++;
+		} else if (!s && !is_spare)
+			s = tbl_ent;
+	}
+
+	if (!s)
+		s = spare;
+	if (!s) {
+		champion = NULL;
+		goto out;
+	}
+	champion = s;
+
+	if (conflict)
+		pr_err("Chose family %#x on '%s', assemble conflicts to new container with '--update=uuid'\n",
+			__le32_to_cpu(s->anchor->family_num), s->disks->devname);
+
+	/* collect all dl's onto 'champion', and update them to
+	 * champion's version of the status
+	 */
+	for (s = *super_list; s; s = s->next) {
+		struct imsm_super *mpb = champion->anchor;
+		struct dl *dl = s->disks;
+
+		if (s == champion)
+			continue;
+
+		mpb->attributes |= s->anchor->attributes & MPB_ATTRIB_2TB_DISK;
+
+		for (i = 0; i < mpb->num_disks; i++) {
+			struct imsm_disk *disk;
+
+			disk = __serial_to_disk(dl->serial, mpb, &dl->index);
+			if (disk) {
+				dl->disk = *disk;
+				/* only set index on disks that are a member of
+				 * a populated contianer, i.e. one with
+				 * raid_devs
+				 */
+				if (is_failed(&dl->disk))
+					dl->index = -2;
+				else if (is_spare(&dl->disk))
+					dl->index = -1;
+				break;
+			}
+		}
+
+		if (i >= mpb->num_disks) {
+			struct intel_disk *idisk;
+
+			idisk = disk_list_get(dl->serial, disk_list);
+			if (idisk && is_spare(&idisk->disk) &&
+			    !is_failed(&idisk->disk) && !is_configured(&idisk->disk))
+				dl->index = -1;
+			else {
+				dl->index = -2;
+				continue;
+			}
+		}
+
+		dl->next = champion->disks;
+		champion->disks = dl;
+		s->disks = NULL;
+	}
+
+	/* delete 'champion' from super_list */
+	for (del = super_list; *del; ) {
+		if (*del == champion) {
+			*del = (*del)->next;
+			break;
+		} else
+			del = &(*del)->next;
+	}
+	champion->next = NULL;
+
+ out:
+	while (disk_list) {
+		struct intel_disk *idisk = disk_list;
+
+		disk_list = disk_list->next;
+		free(idisk);
+	}
+
+	return champion;
+}
+
+static int
+get_sra_super_block(int fd, struct intel_super **super_list, char *devname, int *max, int keep_fd);
+static int get_super_block(struct intel_super **super_list, char *devnm, char *devname,
+			   int major, int minor, int keep_fd);
+static int
+get_devlist_super_block(struct md_list *devlist, struct intel_super **super_list,
+			int *max, int keep_fd);
+
+static int load_super_imsm_all(struct supertype *st, int fd, void **sbp,
+			       char *devname, struct md_list *devlist,
+			       int keep_fd)
+{
+	struct intel_super *super_list = NULL;
+	struct intel_super *super = NULL;
+	int err = 0;
+	int i = 0;
+
+	if (is_fd_valid(fd))
+		/* 'fd' is an opened container */
+		err = get_sra_super_block(fd, &super_list, devname, &i, keep_fd);
+	else
+		/* get super block from devlist devices */
+		err = get_devlist_super_block(devlist, &super_list, &i, keep_fd);
+	if (err)
+		goto error;
+	/* all mpbs enter, maybe one leaves */
+	super = imsm_thunderdome(&super_list, i);
+	if (!super) {
+		err = 1;
+		goto error;
+	}
+
+	if (find_missing(super) != 0) {
+		free_imsm(super);
+		err = 2;
+		goto error;
+	}
+
+	/* load migration record */
+	err = load_imsm_migr_rec(super);
+	if (err == -1) {
+		/* migration is in progress,
+		 * but migr_rec cannot be loaded,
+		 */
+		err = 4;
+		goto error;
+	}
+
+	/* Check migration compatibility */
+	if (err == 0 && check_mpb_migr_compatibility(super) != 0) {
+		pr_err("Unsupported migration detected");
+		if (devname)
+			fprintf(stderr, " on %s\n", devname);
+		else
+			fprintf(stderr, " (IMSM).\n");
+
+		err = 5;
+		goto error;
+	}
+
+	err = 0;
+
+ error:
+	while (super_list) {
+		struct intel_super *s = super_list;
+
+		super_list = super_list->next;
+		free_imsm(s);
+	}
+
+	if (err)
+		return err;
+
+	*sbp = super;
+	if (is_fd_valid(fd))
+		strcpy(st->container_devnm, fd2devnm(fd));
+	else
+		st->container_devnm[0] = 0;
+	if (err == 0 && st->ss == NULL) {
+		st->ss = &super_imsm;
+		st->minor_version = 0;
+		st->max_devs = IMSM_MAX_DEVICES;
+	}
+	return 0;
+}
+
+static int
+get_devlist_super_block(struct md_list *devlist, struct intel_super **super_list,
+			int *max, int keep_fd)
+{
+	struct md_list *tmpdev;
+	int err = 0;
+	int i = 0;
+
+	for (i = 0, tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
+		if (tmpdev->used != 1)
+			continue;
+		if (tmpdev->container == 1) {
+			int lmax = 0;
+			int fd = dev_open(tmpdev->devname, O_RDONLY|O_EXCL);
+			if (!is_fd_valid(fd)) {
+				pr_err("cannot open device %s: %s\n",
+					tmpdev->devname, strerror(errno));
+				err = 8;
+				goto error;
+			}
+			err = get_sra_super_block(fd, super_list,
+						  tmpdev->devname, &lmax,
+						  keep_fd);
+			i += lmax;
+			close(fd);
+			if (err) {
+				err = 7;
+				goto error;
+			}
+		} else {
+			int major = major(tmpdev->st_rdev);
+			int minor = minor(tmpdev->st_rdev);
+			err = get_super_block(super_list,
+					      NULL,
+					      tmpdev->devname,
+					      major, minor,
+					      keep_fd);
+			i++;
+			if (err) {
+				err = 6;
+				goto error;
+			}
+		}
+	}
+ error:
+	*max = i;
+	return err;
+}
+
+static int get_super_block(struct intel_super **super_list, char *devnm, char *devname,
+			   int major, int minor, int keep_fd)
+{
+	struct intel_super *s;
+	char nm[32];
+	int dfd = -1;
+	int err = 0;
+	int retry;
+
+	s = alloc_super();
+	if (!s) {
+		err = 1;
+		goto error;
+	}
+
+	sprintf(nm, "%d:%d", major, minor);
+	dfd = dev_open(nm, O_RDWR);
+	if (!is_fd_valid(dfd)) {
+		err = 2;
+		goto error;
+	}
+
+	if (!get_dev_sector_size(dfd, NULL, &s->sector_size)) {
+		err = 2;
+		goto error;
+	}
+	find_intel_hba_capability(dfd, s, devname);
+	err = load_and_parse_mpb(dfd, s, NULL, keep_fd);
+
+	/* retry the load if we might have raced against mdmon */
+	if (err == 3 && devnm && mdmon_running(devnm))
+		for (retry = 0; retry < 3; retry++) {
+			usleep(3000);
+			err = load_and_parse_mpb(dfd, s, NULL, keep_fd);
+			if (err != 3)
+				break;
+		}
+ error:
+	if (!err) {
+		s->next = *super_list;
+		*super_list = s;
+	} else {
+		if (s)
+			free_imsm(s);
+		close_fd(&dfd);
+	}
+	if (!keep_fd)
+		close_fd(&dfd);
+	return err;
+
+}
+
+static int
+get_sra_super_block(int fd, struct intel_super **super_list, char *devname, int *max, int keep_fd)
+{
+	struct mdinfo *sra;
+	char *devnm;
+	struct mdinfo *sd;
+	int err = 0;
+	int i = 0;
+	sra = sysfs_read(fd, NULL, 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) {
+		err = 1;
+		goto error;
+	}
+	/* load all mpbs */
+	devnm = fd2devnm(fd);
+	for (sd = sra->devs, i = 0; sd; sd = sd->next, i++) {
+		if (get_super_block(super_list, devnm, devname,
+				    sd->disk.major, sd->disk.minor, keep_fd) != 0) {
+			err = 7;
+			goto error;
+		}
+	}
+ error:
+	sysfs_free(sra);
+	*max = i;
+	return err;
+}
+
+static int load_container_imsm(struct supertype *st, int fd, char *devname)
+{
+	return load_super_imsm_all(st, fd, &st->sb, devname, NULL, 1);
+}
+
+static int load_super_imsm(struct supertype *st, int fd, char *devname)
+{
+	struct intel_super *super;
+	int rv;
+	int retry;
+
+	if (test_partition(fd))
+		/* IMSM not allowed on partitions */
+		return 1;
+
+	free_super_imsm(st);
+
+	super = alloc_super();
+	if (!super)
+		return 1;
+
+	if (!get_dev_sector_size(fd, NULL, &super->sector_size)) {
+		free_imsm(super);
+		return 1;
+	}
+	/* Load hba and capabilities if they exist.
+	 * But do not preclude loading metadata in case capabilities or hba are
+	 * non-compliant and ignore_hw_compat is set.
+	 */
+	rv = find_intel_hba_capability(fd, super, devname);
+	/* no orom/efi or non-intel hba of the disk */
+	if (rv != 0 && st->ignore_hw_compat == 0) {
+		if (devname)
+			pr_err("No OROM/EFI properties for %s\n", devname);
+		free_imsm(super);
+		return 2;
+	}
+	rv = load_and_parse_mpb(fd, super, devname, 0);
+
+	/* retry the load if we might have raced against mdmon */
+	if (rv == 3) {
+		struct mdstat_ent *mdstat = NULL;
+		char *name = fd2kname(fd);
+
+		if (name)
+			mdstat = mdstat_by_component(name);
+
+		if (mdstat && mdmon_running(mdstat->devnm) && getpid() != mdmon_pid(mdstat->devnm)) {
+			for (retry = 0; retry < 3; retry++) {
+				usleep(3000);
+				rv = load_and_parse_mpb(fd, super, devname, 0);
+				if (rv != 3)
+					break;
+			}
+		}
+
+		free_mdstat(mdstat);
+	}
+
+	if (rv) {
+		if (devname)
+			pr_err("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;
+	}
+
+	/* load migration record */
+	if (load_imsm_migr_rec(super) == 0) {
+		/* Check for unsupported migration features */
+		if (check_mpb_migr_compatibility(super) != 0) {
+			pr_err("Unsupported migration detected");
+			if (devname)
+				fprintf(stderr, " on %s\n", devname);
+			else
+				fprintf(stderr, " (IMSM).\n");
+			return 3;
+		}
+	}
+
+	return 0;
+}
+
+static __u16 info_to_blocks_per_strip(mdu_array_info_t *info)
+{
+	if (info->level == 1)
+		return 128;
+	return info->chunk_size >> 9;
+}
+
+static unsigned long long info_to_blocks_per_member(mdu_array_info_t *info,
+						    unsigned long long size)
+{
+	if (info->level == 1)
+		return size * 2;
+	else
+		return (size * 2) & ~(info_to_blocks_per_strip(info) - 1);
+}
+
+static void imsm_update_version_info(struct intel_super *super)
+{
+	/* update the version and attributes */
+	struct imsm_super *mpb = super->anchor;
+	char *version;
+	struct imsm_dev *dev;
+	struct imsm_map *map;
+	int i;
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		dev = get_imsm_dev(super, i);
+		map = get_imsm_map(dev, MAP_0);
+		if (__le32_to_cpu(dev->size_high) > 0)
+			mpb->attributes |= MPB_ATTRIB_2TB;
+
+		/* FIXME detect when an array spans a port multiplier */
+		#if 0
+		mpb->attributes |= MPB_ATTRIB_PM;
+		#endif
+
+		if (mpb->num_raid_devs > 1 ||
+		    mpb->attributes != MPB_ATTRIB_CHECKSUM_VERIFY) {
+			version = MPB_VERSION_ATTRIBS;
+			switch (get_imsm_raid_level(map)) {
+			case 0: mpb->attributes |= MPB_ATTRIB_RAID0; break;
+			case 1: mpb->attributes |= MPB_ATTRIB_RAID1; break;
+			case 10: mpb->attributes |= MPB_ATTRIB_RAID10; break;
+			case 5: mpb->attributes |= MPB_ATTRIB_RAID5; break;
+			}
+		} else {
+			if (map->num_members >= 5)
+				version = MPB_VERSION_5OR6_DISK_ARRAY;
+			else if (dev->status == DEV_CLONE_N_GO)
+				version = MPB_VERSION_CNG;
+			else if (get_imsm_raid_level(map) == 5)
+				version = MPB_VERSION_RAID5;
+			else if (map->num_members >= 3)
+				version = MPB_VERSION_3OR4_DISK_ARRAY;
+			else if (get_imsm_raid_level(map) == 1)
+				version = MPB_VERSION_RAID1;
+			else
+				version = MPB_VERSION_RAID0;
+		}
+		strcpy(((char *) mpb->sig) + strlen(MPB_SIGNATURE), version);
+	}
+}
+
+static int check_name(struct intel_super *super, char *name, int quiet)
+{
+	struct imsm_super *mpb = super->anchor;
+	char *reason = NULL;
+	char *start = name;
+	size_t len = strlen(name);
+	int i;
+
+	if (len > 0) {
+		while (isspace(start[len - 1]))
+			start[--len] = 0;
+		while (*start && isspace(*start))
+			++start, --len;
+		memmove(name, start, len + 1);
+	}
+
+	if (len > MAX_RAID_SERIAL_LEN)
+		reason = "must be 16 characters or less";
+	else if (len == 0)
+		reason = "must be a non-empty string";
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev = get_imsm_dev(super, i);
+
+		if (strncmp((char *) dev->volume, name, MAX_RAID_SERIAL_LEN) == 0) {
+			reason = "already exists";
+			break;
+		}
+	}
+
+	if (reason && !quiet)
+		pr_err("imsm volume name %s\n", reason);
+
+	return !reason;
+}
+
+static int init_super_imsm_volume(struct supertype *st, mdu_array_info_t *info,
+				  struct shape *s, char *name,
+				  char *homehost, int *uuid,
+				  long long data_offset)
+{
+	/* We are creating a volume inside a pre-existing container.
+	 * so st->sb is already set.
+	 */
+	struct intel_super *super = st->sb;
+	unsigned int sector_size = super->sector_size;
+	struct imsm_super *mpb = super->anchor;
+	struct intel_dev *dv;
+	struct imsm_dev *dev;
+	struct imsm_vol *vol;
+	struct imsm_map *map;
+	int idx = mpb->num_raid_devs;
+	int i;
+	int namelen;
+	unsigned long long array_blocks;
+	size_t size_old, size_new;
+	unsigned int data_disks;
+	unsigned long long size_per_member;
+
+	if (super->orom && mpb->num_raid_devs >= super->orom->vpa) {
+		pr_err("This imsm-container already has the maximum of %d volumes\n", super->orom->vpa);
+		return 0;
+	}
+
+	/* ensure the mpb is large enough for the new data */
+	size_old = __le32_to_cpu(mpb->mpb_size);
+	size_new = disks_to_mpb_size(info->nr_disks);
+	if (size_new > size_old) {
+		void *mpb_new;
+		size_t size_round = ROUND_UP(size_new, sector_size);
+
+		if (posix_memalign(&mpb_new, sector_size, size_round) != 0) {
+			pr_err("could not allocate new mpb\n");
+			return 0;
+		}
+		if (posix_memalign(&super->migr_rec_buf, MAX_SECTOR_SIZE,
+				   MIGR_REC_BUF_SECTORS*
+				   MAX_SECTOR_SIZE) != 0) {
+			pr_err("could not allocate migr_rec buffer\n");
+			free(super->buf);
+			free(super);
+			free(mpb_new);
+			return 0;
+		}
+		memcpy(mpb_new, mpb, size_old);
+		free(mpb);
+		mpb = mpb_new;
+		super->anchor = mpb_new;
+		mpb->mpb_size = __cpu_to_le32(size_new);
+		memset(mpb_new + size_old, 0, size_round - size_old);
+		super->len = size_round;
+	}
+	super->current_vol = idx;
+
+	/* handle 'failed_disks' by either:
+	 * a) create dummy disk entries in the table if this the first
+	 *    volume in the array.  We add them here as this is the only
+	 *    opportunity to add them. add_to_super_imsm_volume()
+	 *    handles the non-failed disks and continues incrementing
+	 *    mpb->num_disks.
+	 * b) validate that 'failed_disks' matches the current number
+	 *    of missing disks if the container is populated
+	 */
+	if (super->current_vol == 0) {
+		mpb->num_disks = 0;
+		for (i = 0; i < info->failed_disks; i++) {
+			struct imsm_disk *disk;
+
+			mpb->num_disks++;
+			disk = __get_imsm_disk(mpb, i);
+			disk->status = CONFIGURED_DISK | FAILED_DISK;
+			disk->scsi_id = __cpu_to_le32(~(__u32)0);
+			snprintf((char *) disk->serial, MAX_RAID_SERIAL_LEN,
+				 "missing:%d", (__u8)i);
+		}
+		find_missing(super);
+	} else {
+		int missing = 0;
+		struct dl *d;
+
+		for (d = super->missing; d; d = d->next)
+			missing++;
+		if (info->failed_disks > missing) {
+			pr_err("unable to add 'missing' disk to container\n");
+			return 0;
+		}
+	}
+
+	if (!check_name(super, name, 0))
+		return 0;
+	dv = xmalloc(sizeof(*dv));
+	dev = xcalloc(1, sizeof(*dev) + sizeof(__u32) * (info->raid_disks - 1));
+	/*
+	 * Explicitly allow truncating to not confuse gcc's
+	 * -Werror=stringop-truncation
+	 */
+	namelen = min((int) strlen(name), MAX_RAID_SERIAL_LEN);
+	memcpy(dev->volume, name, namelen);
+	array_blocks = calc_array_size(info->level, info->raid_disks,
+					       info->layout, info->chunk_size,
+					       s->size * BLOCKS_PER_KB);
+	data_disks = get_data_disks(info->level, info->layout,
+				    info->raid_disks);
+	array_blocks = round_size_to_mb(array_blocks, data_disks);
+	size_per_member = array_blocks / data_disks;
+
+	set_imsm_dev_size(dev, array_blocks);
+	dev->status = (DEV_READ_COALESCING | DEV_WRITE_COALESCING);
+	vol = &dev->vol;
+	vol->migr_state = 0;
+	set_migr_type(dev, MIGR_INIT);
+	vol->dirty = !info->state;
+	set_vol_curr_migr_unit(dev, 0);
+	map = get_imsm_map(dev, MAP_0);
+	set_pba_of_lba0(map, super->create_offset);
+	map->blocks_per_strip = __cpu_to_le16(info_to_blocks_per_strip(info));
+	map->failed_disk_num = ~0;
+	if (info->level > 0)
+		map->map_state = (info->state ? IMSM_T_STATE_NORMAL
+				  : IMSM_T_STATE_UNINITIALIZED);
+	else
+		map->map_state = info->failed_disks ? IMSM_T_STATE_FAILED :
+						      IMSM_T_STATE_NORMAL;
+	map->ddf = 1;
+
+	if (info->level == 1 && info->raid_disks > 2) {
+		free(dev);
+		free(dv);
+		pr_err("imsm does not support more than 2 disksin a raid1 volume\n");
+		return 0;
+	}
+
+	map->raid_level = info->level;
+	if (info->level == 10)
+		map->raid_level = 1;
+	set_num_domains(map);
+
+	size_per_member += NUM_BLOCKS_DIRTY_STRIPE_REGION;
+	set_blocks_per_member(map, info_to_blocks_per_member(info,
+							     size_per_member /
+							     BLOCKS_PER_KB));
+
+	map->num_members = info->raid_disks;
+	update_num_data_stripes(map, array_blocks);
+	for (i = 0; i < map->num_members; i++) {
+		/* initialized in add_to_super */
+		set_imsm_ord_tbl_ent(map, i, IMSM_ORD_REBUILD);
+	}
+	mpb->num_raid_devs++;
+	mpb->num_raid_devs_created++;
+	dev->my_vol_raid_dev_num = mpb->num_raid_devs_created;
+
+	if (s->consistency_policy <= CONSISTENCY_POLICY_RESYNC) {
+		dev->rwh_policy = RWH_MULTIPLE_OFF;
+	} else if (s->consistency_policy == CONSISTENCY_POLICY_PPL) {
+		dev->rwh_policy = RWH_MULTIPLE_DISTRIBUTED;
+	} else {
+		free(dev);
+		free(dv);
+		pr_err("imsm does not support consistency policy %s\n",
+		       map_num(consistency_policies, s->consistency_policy));
+		return 0;
+	}
+
+	dv->dev = dev;
+	dv->index = super->current_vol;
+	dv->next = super->devlist;
+	super->devlist = dv;
+
+	imsm_update_version_info(super);
+
+	return 1;
+}
+
+static int init_super_imsm(struct supertype *st, mdu_array_info_t *info,
+		           struct shape *s, char *name,
+			   char *homehost, int *uuid,
+			   unsigned long long data_offset)
+{
+	/* This is primarily called by Create when creating a new array.
+	 * We will then get add_to_super called for each component, and then
+	 * write_init_super called to write it out to each device.
+	 * For IMSM, Create can create on fresh devices or on a pre-existing
+	 * array.
+	 * To create on a pre-existing array a different method will be called.
+	 * This one is just for fresh drives.
+	 */
+	struct intel_super *super;
+	struct imsm_super *mpb;
+	size_t mpb_size;
+	char *version;
+
+	if (data_offset != INVALID_SECTORS) {
+		pr_err("data-offset not supported by imsm\n");
+		return 0;
+	}
+
+	if (st->sb)
+		return init_super_imsm_volume(st, info, s, name, homehost, uuid,
+					      data_offset);
+
+	if (info)
+		mpb_size = disks_to_mpb_size(info->nr_disks);
+	else
+		mpb_size = MAX_SECTOR_SIZE;
+
+	super = alloc_super();
+	if (super &&
+	    posix_memalign(&super->buf, MAX_SECTOR_SIZE, mpb_size) != 0) {
+		free_imsm(super);
+		super = NULL;
+	}
+	if (!super) {
+		pr_err("could not allocate superblock\n");
+		return 0;
+	}
+	if (posix_memalign(&super->migr_rec_buf, MAX_SECTOR_SIZE,
+	    MIGR_REC_BUF_SECTORS*MAX_SECTOR_SIZE) != 0) {
+		pr_err("could not allocate migr_rec buffer\n");
+		free(super->buf);
+		free_imsm(super);
+		return 0;
+	}
+	memset(super->buf, 0, mpb_size);
+	mpb = super->buf;
+	mpb->mpb_size = __cpu_to_le32(mpb_size);
+	st->sb = super;
+
+	if (info == NULL) {
+		/* zeroing superblock */
+		return 0;
+	}
+
+	mpb->attributes = MPB_ATTRIB_CHECKSUM_VERIFY;
+
+	version = (char *) mpb->sig;
+	strcpy(version, MPB_SIGNATURE);
+	version += strlen(MPB_SIGNATURE);
+	strcpy(version, MPB_VERSION_RAID0);
+
+	return 1;
+}
+
+static int drive_validate_sector_size(struct intel_super *super, struct dl *dl)
+{
+	unsigned int member_sector_size;
+
+	if (!is_fd_valid(dl->fd)) {
+		pr_err("Invalid file descriptor for %s\n", dl->devname);
+		return 0;
+	}
+
+	if (!get_dev_sector_size(dl->fd, dl->devname, &member_sector_size))
+		return 0;
+	if (member_sector_size != super->sector_size)
+		return 0;
+	return 1;
+}
+
+static int add_to_super_imsm_volume(struct supertype *st, mdu_disk_info_t *dk,
+				     int fd, char *devname)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->anchor;
+	struct imsm_disk *_disk;
+	struct imsm_dev *dev;
+	struct imsm_map *map;
+	struct dl *dl, *df;
+	int slot;
+
+	dev = get_imsm_dev(super, super->current_vol);
+	map = get_imsm_map(dev, MAP_0);
+
+	if (! (dk->state & (1<<MD_DISK_SYNC))) {
+		pr_err("%s: Cannot add spare devices to IMSM volume\n",
+			devname);
+		return 1;
+	}
+
+	if (!is_fd_valid(fd)) {
+		/* we're doing autolayout so grab the pre-marked (in
+		 * validate_geometry) raid_disk
+		 */
+		for (dl = super->disks; dl; dl = dl->next)
+			if (dl->raiddisk == dk->raid_disk)
+				break;
+	} else {
+		for (dl = super->disks; dl ; dl = dl->next)
+			if (dl->major == dk->major &&
+			    dl->minor == dk->minor)
+				break;
+	}
+
+	if (!dl) {
+		pr_err("%s is not a member of the same container\n", devname);
+		return 1;
+	}
+
+	if (mpb->num_disks == 0)
+		if (!get_dev_sector_size(dl->fd, dl->devname,
+					 &super->sector_size))
+			return 1;
+
+	if (!drive_validate_sector_size(super, dl)) {
+		pr_err("Combining drives of different sector size in one volume is not allowed\n");
+		return 1;
+	}
+
+	/* add a pristine spare to the metadata */
+	if (dl->index < 0) {
+		dl->index = super->anchor->num_disks;
+		super->anchor->num_disks++;
+	}
+	/* Check the device has not already been added */
+	slot = get_imsm_disk_slot(map, dl->index);
+	if (slot >= 0 &&
+	    (get_imsm_ord_tbl_ent(dev, slot, MAP_X) & IMSM_ORD_REBUILD) == 0) {
+		pr_err("%s has been included in this array twice\n",
+			devname);
+		return 1;
+	}
+	set_imsm_ord_tbl_ent(map, dk->raid_disk, dl->index);
+	dl->disk.status = CONFIGURED_DISK;
+
+	/* update size of 'missing' disks to be at least as large as the
+	 * largest acitve member (we only have dummy missing disks when
+	 * creating the first volume)
+	 */
+	if (super->current_vol == 0) {
+		for (df = super->missing; df; df = df->next) {
+			if (total_blocks(&dl->disk) > total_blocks(&df->disk))
+				set_total_blocks(&df->disk, total_blocks(&dl->disk));
+			_disk = __get_imsm_disk(mpb, df->index);
+			*_disk = df->disk;
+		}
+	}
+
+	/* refresh unset/failed slots to point to valid 'missing' entries */
+	for (df = super->missing; df; df = df->next)
+		for (slot = 0; slot < mpb->num_disks; slot++) {
+			__u32 ord = get_imsm_ord_tbl_ent(dev, slot, MAP_X);
+
+			if ((ord & IMSM_ORD_REBUILD) == 0)
+				continue;
+			set_imsm_ord_tbl_ent(map, slot, df->index | IMSM_ORD_REBUILD);
+			if (is_gen_migration(dev)) {
+				struct imsm_map *map2 = get_imsm_map(dev,
+								     MAP_1);
+				int slot2 = get_imsm_disk_slot(map2, df->index);
+				if (slot2 < map2->num_members && slot2 >= 0) {
+					__u32 ord2 = get_imsm_ord_tbl_ent(dev,
+									 slot2,
+									 MAP_1);
+					if ((unsigned)df->index ==
+							       ord_to_idx(ord2))
+						set_imsm_ord_tbl_ent(map2,
+							slot2,
+							df->index |
+							IMSM_ORD_REBUILD);
+				}
+			}
+			dprintf("set slot:%d to missing disk:%d\n", slot, df->index);
+			break;
+		}
+
+	/* if we are creating the first raid device update the family number */
+	if (super->current_vol == 0) {
+		__u32 sum;
+		struct imsm_dev *_dev = __get_imsm_dev(mpb, 0);
+
+		_disk = __get_imsm_disk(mpb, dl->index);
+		if (!_dev || !_disk) {
+			pr_err("BUG mpb setup error\n");
+			return 1;
+		}
+		*_dev = *dev;
+		*_disk = dl->disk;
+		sum = random32();
+		sum += __gen_imsm_checksum(mpb);
+		mpb->family_num = __cpu_to_le32(sum);
+		mpb->orig_family_num = mpb->family_num;
+		mpb->creation_time = __cpu_to_le64((__u64)time(NULL));
+	}
+	super->current_disk = dl;
+	return 0;
+}
+
+/* mark_spare()
+ *   Function marks disk as spare and restores disk serial
+ *   in case it was previously marked as failed by takeover operation
+ * reruns:
+ *   -1 : critical error
+ *    0 : disk is marked as spare but serial is not set
+ *    1 : success
+ */
+int mark_spare(struct dl *disk)
+{
+	__u8 serial[MAX_RAID_SERIAL_LEN];
+	int ret_val = -1;
+
+	if (!disk)
+		return ret_val;
+
+	ret_val = 0;
+	if (!imsm_read_serial(disk->fd, NULL, serial, MAX_RAID_SERIAL_LEN)) {
+		/* Restore disk serial number, because takeover marks disk
+		 * as failed and adds to serial ':0' before it becomes
+		 * a spare disk.
+		 */
+		serialcpy(disk->serial, serial);
+		serialcpy(disk->disk.serial, serial);
+		ret_val = 1;
+	}
+	disk->disk.status = SPARE_DISK;
+	disk->index = -1;
+
+	return ret_val;
+}
+
+
+static int write_super_imsm_spare(struct intel_super *super, struct dl *d);
+
+static int add_to_super_imsm(struct supertype *st, mdu_disk_info_t *dk,
+			     int fd, char *devname,
+			     unsigned long long data_offset)
+{
+	struct intel_super *super = st->sb;
+	struct dl *dd;
+	unsigned long long size;
+	unsigned int member_sector_size;
+	__u32 id;
+	int rv;
+	struct stat stb;
+
+	/* If we are on an RAID enabled platform check that the disk is
+	 * attached to the raid controller.
+	 * We do not need to test disks attachment for container based additions,
+	 * they shall be already tested when container was created/assembled.
+	 */
+	rv = find_intel_hba_capability(fd, super, devname);
+	/* no orom/efi or non-intel hba of the disk */
+	if (rv != 0) {
+		dprintf("capability: %p fd: %d ret: %d\n",
+			super->orom, fd, rv);
+		return 1;
+	}
+
+	if (super->current_vol >= 0)
+		return add_to_super_imsm_volume(st, dk, fd, devname);
+
+	fstat(fd, &stb);
+	dd = xcalloc(sizeof(*dd), 1);
+	dd->major = major(stb.st_rdev);
+	dd->minor = minor(stb.st_rdev);
+	dd->devname = devname ? xstrdup(devname) : NULL;
+	dd->fd = fd;
+	dd->e = NULL;
+	dd->action = DISK_ADD;
+	rv = imsm_read_serial(fd, devname, dd->serial, MAX_RAID_SERIAL_LEN);
+	if (rv) {
+		pr_err("failed to retrieve scsi serial, aborting\n");
+		__free_imsm_disk(dd, 0);
+		abort();
+	}
+
+	if (super->hba && ((super->hba->type == SYS_DEV_NVME) ||
+	   (super->hba->type == SYS_DEV_VMD))) {
+		int i;
+		char cntrl_path[PATH_MAX];
+		char *cntrl_name;
+		char pci_dev_path[PATH_MAX];
+
+		if (!diskfd_to_devpath(fd, 2, pci_dev_path) ||
+		    !diskfd_to_devpath(fd, 1, cntrl_path)) {
+			pr_err("failed to get dev paths, aborting\n");
+			__free_imsm_disk(dd, 0);
+			return 1;
+		}
+
+		cntrl_name = basename(cntrl_path);
+		if (is_multipath_nvme(fd))
+			pr_err("%s controller supports Multi-Path I/O, Intel (R) VROC does not support multipathing\n",
+			       cntrl_name);
+
+		if (devpath_to_vendor(pci_dev_path) == 0x8086) {
+			/*
+			 * If Intel's NVMe drive has serial ended with
+			 * "-A","-B","-1" or "-2" it means that this is "x8"
+			 * device (double drive on single PCIe card).
+			 * User should be warned about potential data loss.
+			 */
+			for (i = MAX_RAID_SERIAL_LEN-1; i > 0; i--) {
+				/* Skip empty character at the end */
+				if (dd->serial[i] == 0)
+					continue;
+
+				if (((dd->serial[i] == 'A') ||
+				   (dd->serial[i] == 'B') ||
+				   (dd->serial[i] == '1') ||
+				   (dd->serial[i] == '2')) &&
+				   (dd->serial[i-1] == '-'))
+					pr_err("\tThe action you are about to take may put your data at risk.\n"
+						"\tPlease note that x8 devices may consist of two separate x4 devices "
+						"located on a single PCIe port.\n"
+						"\tRAID 0 is the only supported configuration for this type of x8 device.\n");
+				break;
+			}
+		} else if (super->hba->type == SYS_DEV_VMD && super->orom &&
+		    !imsm_orom_has_tpv_support(super->orom)) {
+			pr_err("\tPlatform configuration does not support non-Intel NVMe drives.\n"
+			       "\tPlease refer to Intel(R) RSTe/VROC user guide.\n");
+			__free_imsm_disk(dd, 0);
+			return 1;
+		}
+	}
+
+	get_dev_size(fd, NULL, &size);
+	if (!get_dev_sector_size(fd, NULL, &member_sector_size)) {
+		__free_imsm_disk(dd, 0);
+		return 1;
+	}
+
+	if (super->sector_size == 0) {
+		/* this a first device, so sector_size is not set yet */
+		super->sector_size = member_sector_size;
+	}
+
+	/* clear migr_rec when adding disk to container */
+	memset(super->migr_rec_buf, 0, MIGR_REC_BUF_SECTORS*MAX_SECTOR_SIZE);
+	if (lseek64(fd, size - MIGR_REC_SECTOR_POSITION*member_sector_size,
+	    SEEK_SET) >= 0) {
+		if ((unsigned int)write(fd, super->migr_rec_buf,
+		    MIGR_REC_BUF_SECTORS*member_sector_size) !=
+		    MIGR_REC_BUF_SECTORS*member_sector_size)
+			perror("Write migr_rec failed");
+	}
+
+	size /= 512;
+	serialcpy(dd->disk.serial, dd->serial);
+	set_total_blocks(&dd->disk, size);
+	if (__le32_to_cpu(dd->disk.total_blocks_hi) > 0) {
+		struct imsm_super *mpb = super->anchor;
+		mpb->attributes |= MPB_ATTRIB_2TB_DISK;
+	}
+	mark_spare(dd);
+	if (sysfs_disk_to_scsi_id(fd, &id) == 0)
+		dd->disk.scsi_id = __cpu_to_le32(id);
+	else
+		dd->disk.scsi_id = __cpu_to_le32(0);
+
+	if (st->update_tail) {
+		dd->next = super->disk_mgmt_list;
+		super->disk_mgmt_list = dd;
+	} else {
+		/* this is called outside of mdmon
+		 * write initial spare metadata
+		 * mdmon will overwrite it.
+		 */
+		dd->next = super->disks;
+		super->disks = dd;
+		write_super_imsm_spare(super, dd);
+	}
+
+	return 0;
+}
+
+static int remove_from_super_imsm(struct supertype *st, mdu_disk_info_t *dk)
+{
+	struct intel_super *super = st->sb;
+	struct dl *dd;
+
+	/* remove from super works only in mdmon - for communication
+	 * manager - monitor. Check if communication memory buffer
+	 * is prepared.
+	 */
+	if (!st->update_tail) {
+		pr_err("shall be used in mdmon context only\n");
+		return 1;
+	}
+	dd = xcalloc(1, sizeof(*dd));
+	dd->major = dk->major;
+	dd->minor = dk->minor;
+	dd->fd = -1;
+	mark_spare(dd);
+	dd->action = DISK_REMOVE;
+
+	dd->next = super->disk_mgmt_list;
+	super->disk_mgmt_list = dd;
+
+	return 0;
+}
+
+static int store_imsm_mpb(int fd, struct imsm_super *mpb);
+
+static union {
+	char buf[MAX_SECTOR_SIZE];
+	struct imsm_super anchor;
+} spare_record __attribute__ ((aligned(MAX_SECTOR_SIZE)));
+
+
+static int write_super_imsm_spare(struct intel_super *super, struct dl *d)
+{
+	struct imsm_super *mpb = super->anchor;
+	struct imsm_super *spare = &spare_record.anchor;
+	__u32 sum;
+
+	if (d->index != -1)
+		return 1;
+
+	spare->mpb_size = __cpu_to_le32(sizeof(struct imsm_super));
+	spare->generation_num = __cpu_to_le32(1UL);
+	spare->attributes = MPB_ATTRIB_CHECKSUM_VERIFY;
+	spare->num_disks = 1;
+	spare->num_raid_devs = 0;
+	spare->cache_size = mpb->cache_size;
+	spare->pwr_cycle_count = __cpu_to_le32(1);
+
+	snprintf((char *) spare->sig, MAX_SIGNATURE_LENGTH,
+		 MPB_SIGNATURE MPB_VERSION_RAID0);
+
+	spare->disk[0] = d->disk;
+	if (__le32_to_cpu(d->disk.total_blocks_hi) > 0)
+		spare->attributes |= MPB_ATTRIB_2TB_DISK;
+
+	if (super->sector_size == 4096)
+		convert_to_4k_imsm_disk(&spare->disk[0]);
+
+	sum = __gen_imsm_checksum(spare);
+	spare->family_num = __cpu_to_le32(sum);
+	spare->orig_family_num = 0;
+	sum = __gen_imsm_checksum(spare);
+	spare->check_sum = __cpu_to_le32(sum);
+
+	if (store_imsm_mpb(d->fd, spare)) {
+		pr_err("failed for device %d:%d %s\n",
+			d->major, d->minor, strerror(errno));
+		return 1;
+	}
+
+	return 0;
+}
+/* spare records have their own family number and do not have any defined raid
+ * devices
+ */
+static int write_super_imsm_spares(struct intel_super *super, int doclose)
+{
+	struct dl *d;
+
+	for (d = super->disks; d; d = d->next) {
+		if (d->index != -1)
+			continue;
+
+		if (write_super_imsm_spare(super, d))
+			return 1;
+
+		if (doclose)
+			close_fd(&d->fd);
+	}
+
+	return 0;
+}
+
+static int write_super_imsm(struct supertype *st, int doclose)
+{
+	struct intel_super *super = st->sb;
+	unsigned int sector_size = super->sector_size;
+	struct imsm_super *mpb = super->anchor;
+	struct dl *d;
+	__u32 generation;
+	__u32 sum;
+	int spares = 0;
+	int i;
+	__u32 mpb_size = sizeof(struct imsm_super) - sizeof(struct imsm_disk);
+	int num_disks = 0;
+	int clear_migration_record = 1;
+	__u32 bbm_log_size;
+
+	/* 'generation' is incremented everytime the metadata is written */
+	generation = __le32_to_cpu(mpb->generation_num);
+	generation++;
+	mpb->generation_num = __cpu_to_le32(generation);
+
+	/* fix up cases where previous mdadm releases failed to set
+	 * orig_family_num
+	 */
+	if (mpb->orig_family_num == 0)
+		mpb->orig_family_num = mpb->family_num;
+
+	for (d = super->disks; d; d = d->next) {
+		if (d->index == -1)
+			spares++;
+		else {
+			mpb->disk[d->index] = d->disk;
+			num_disks++;
+		}
+	}
+	for (d = super->missing; d; d = d->next) {
+		mpb->disk[d->index] = d->disk;
+		num_disks++;
+	}
+	mpb->num_disks = num_disks;
+	mpb_size += sizeof(struct imsm_disk) * mpb->num_disks;
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev = __get_imsm_dev(mpb, i);
+		struct imsm_dev *dev2 = get_imsm_dev(super, i);
+		if (dev && dev2) {
+			imsm_copy_dev(dev, dev2);
+			mpb_size += sizeof_imsm_dev(dev, 0);
+		}
+		if (is_gen_migration(dev2))
+			clear_migration_record = 0;
+	}
+
+	bbm_log_size = get_imsm_bbm_log_size(super->bbm_log);
+
+	if (bbm_log_size) {
+		memcpy((void *)mpb + mpb_size, super->bbm_log, bbm_log_size);
+		mpb->attributes |= MPB_ATTRIB_BBM;
+	} else
+		mpb->attributes &= ~MPB_ATTRIB_BBM;
+
+	super->anchor->bbm_log_size = __cpu_to_le32(bbm_log_size);
+	mpb_size += bbm_log_size;
+	mpb->mpb_size = __cpu_to_le32(mpb_size);
+
+#ifdef DEBUG
+	assert(super->len == 0 || mpb_size <= super->len);
+#endif
+
+	/* recalculate checksum */
+	sum = __gen_imsm_checksum(mpb);
+	mpb->check_sum = __cpu_to_le32(sum);
+
+	if (super->clean_migration_record_by_mdmon) {
+		clear_migration_record = 1;
+		super->clean_migration_record_by_mdmon = 0;
+	}
+	if (clear_migration_record)
+		memset(super->migr_rec_buf, 0,
+		    MIGR_REC_BUF_SECTORS*MAX_SECTOR_SIZE);
+
+	if (sector_size == 4096)
+		convert_to_4k(super);
+
+	/* write the mpb for disks that compose raid devices */
+	for (d = super->disks; d ; d = d->next) {
+		if (d->index < 0 || is_failed(&d->disk))
+			continue;
+
+		if (clear_migration_record) {
+			unsigned long long dsize;
+
+			get_dev_size(d->fd, NULL, &dsize);
+			if (lseek64(d->fd, dsize - sector_size,
+			    SEEK_SET) >= 0) {
+				if ((unsigned int)write(d->fd,
+				    super->migr_rec_buf,
+				    MIGR_REC_BUF_SECTORS*sector_size) !=
+				    MIGR_REC_BUF_SECTORS*sector_size)
+					perror("Write migr_rec failed");
+			}
+		}
+
+		if (store_imsm_mpb(d->fd, mpb))
+			fprintf(stderr,
+				"failed for device %d:%d (fd: %d)%s\n",
+				d->major, d->minor,
+				d->fd, strerror(errno));
+
+		if (doclose)
+			close_fd(&d->fd);
+	}
+
+	if (spares)
+		return write_super_imsm_spares(super, doclose);
+
+	return 0;
+}
+
+static int create_array(struct supertype *st, int dev_idx)
+{
+	size_t len;
+	struct imsm_update_create_array *u;
+	struct intel_super *super = st->sb;
+	struct imsm_dev *dev = get_imsm_dev(super, dev_idx);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	struct disk_info *inf;
+	struct imsm_disk *disk;
+	int i;
+
+	len = sizeof(*u) - sizeof(*dev) + sizeof_imsm_dev(dev, 0) +
+	      sizeof(*inf) * map->num_members;
+	u = xmalloc(len);
+	u->type = update_create_array;
+	u->dev_idx = dev_idx;
+	imsm_copy_dev(&u->dev, dev);
+	inf = get_disk_info(u);
+	for (i = 0; i < map->num_members; i++) {
+		int idx = get_imsm_disk_idx(dev, i, MAP_X);
+
+		disk = get_imsm_disk(super, idx);
+		if (!disk)
+			disk = get_imsm_missing(super, idx);
+		serialcpy(inf[i].serial, disk->serial);
+	}
+	append_metadata_update(st, u, len);
+
+	return 0;
+}
+
+static int mgmt_disk(struct supertype *st)
+{
+	struct intel_super *super = st->sb;
+	size_t len;
+	struct imsm_update_add_remove_disk *u;
+
+	if (!super->disk_mgmt_list)
+		return 0;
+
+	len = sizeof(*u);
+	u = xmalloc(len);
+	u->type = update_add_remove_disk;
+	append_metadata_update(st, u, len);
+
+	return 0;
+}
+
+__u32 crc32c_le(__u32 crc, unsigned char const *p, size_t len);
+
+static int write_ppl_header(unsigned long long ppl_sector, int fd, void *buf)
+{
+	struct ppl_header *ppl_hdr = buf;
+	int ret;
+
+	ppl_hdr->checksum = __cpu_to_le32(~crc32c_le(~0, buf, PPL_HEADER_SIZE));
+
+	if (lseek64(fd, ppl_sector * 512, SEEK_SET) < 0) {
+		ret = -errno;
+		perror("Failed to seek to PPL header location");
+		return ret;
+	}
+
+	if (write(fd, buf, PPL_HEADER_SIZE) != PPL_HEADER_SIZE) {
+		ret = -errno;
+		perror("Write PPL header failed");
+		return ret;
+	}
+
+	fsync(fd);
+
+	return 0;
+}
+
+static int write_init_ppl_imsm(struct supertype *st, struct mdinfo *info, int fd)
+{
+	struct intel_super *super = st->sb;
+	void *buf;
+	struct ppl_header *ppl_hdr;
+	int ret;
+
+	/* first clear entire ppl space */
+	ret = zero_disk_range(fd, info->ppl_sector, info->ppl_size);
+	if (ret)
+		return ret;
+
+	ret = posix_memalign(&buf, MAX_SECTOR_SIZE, PPL_HEADER_SIZE);
+	if (ret) {
+		pr_err("Failed to allocate PPL header buffer\n");
+		return -ret;
+	}
+
+	memset(buf, 0, PPL_HEADER_SIZE);
+	ppl_hdr = buf;
+	memset(ppl_hdr->reserved, 0xff, PPL_HDR_RESERVED);
+	ppl_hdr->signature = __cpu_to_le32(super->anchor->orig_family_num);
+
+	if (info->mismatch_cnt) {
+		/*
+		 * We are overwriting an invalid ppl. Make one entry with wrong
+		 * checksum to prevent the kernel from skipping resync.
+		 */
+		ppl_hdr->entries_count = __cpu_to_le32(1);
+		ppl_hdr->entries[0].checksum = ~0;
+	}
+
+	ret = write_ppl_header(info->ppl_sector, fd, buf);
+
+	free(buf);
+	return ret;
+}
+
+static int is_rebuilding(struct imsm_dev *dev);
+
+static int validate_ppl_imsm(struct supertype *st, struct mdinfo *info,
+			     struct mdinfo *disk)
+{
+	struct intel_super *super = st->sb;
+	struct dl *d;
+	void *buf_orig, *buf, *buf_prev = NULL;
+	int ret = 0;
+	struct ppl_header *ppl_hdr = NULL;
+	__u32 crc;
+	struct imsm_dev *dev;
+	__u32 idx;
+	unsigned int i;
+	unsigned long long ppl_offset = 0;
+	unsigned long long prev_gen_num = 0;
+
+	if (disk->disk.raid_disk < 0)
+		return 0;
+
+	dev = get_imsm_dev(super, info->container_member);
+	idx = get_imsm_disk_idx(dev, disk->disk.raid_disk, MAP_0);
+	d = get_imsm_dl_disk(super, idx);
+
+	if (!d || d->index < 0 || is_failed(&d->disk))
+		return 0;
+
+	if (posix_memalign(&buf_orig, MAX_SECTOR_SIZE, PPL_HEADER_SIZE * 2)) {
+		pr_err("Failed to allocate PPL header buffer\n");
+		return -1;
+	}
+	buf = buf_orig;
+
+	ret = 1;
+	while (ppl_offset < MULTIPLE_PPL_AREA_SIZE_IMSM) {
+		void *tmp;
+
+		dprintf("Checking potential PPL at offset: %llu\n", ppl_offset);
+
+		if (lseek64(d->fd, info->ppl_sector * 512 + ppl_offset,
+			    SEEK_SET) < 0) {
+			perror("Failed to seek to PPL header location");
+			ret = -1;
+			break;
+		}
+
+		if (read(d->fd, buf, PPL_HEADER_SIZE) != PPL_HEADER_SIZE) {
+			perror("Read PPL header failed");
+			ret = -1;
+			break;
+		}
+
+		ppl_hdr = buf;
+
+		crc = __le32_to_cpu(ppl_hdr->checksum);
+		ppl_hdr->checksum = 0;
+
+		if (crc != ~crc32c_le(~0, buf, PPL_HEADER_SIZE)) {
+			dprintf("Wrong PPL header checksum on %s\n",
+				d->devname);
+			break;
+		}
+
+		if (prev_gen_num > __le64_to_cpu(ppl_hdr->generation)) {
+			/* previous was newest, it was already checked */
+			break;
+		}
+
+		if ((__le32_to_cpu(ppl_hdr->signature) !=
+			      super->anchor->orig_family_num)) {
+			dprintf("Wrong PPL header signature on %s\n",
+				d->devname);
+			ret = 1;
+			break;
+		}
+
+		ret = 0;
+		prev_gen_num = __le64_to_cpu(ppl_hdr->generation);
+
+		ppl_offset += PPL_HEADER_SIZE;
+		for (i = 0; i < __le32_to_cpu(ppl_hdr->entries_count); i++)
+			ppl_offset +=
+				   __le32_to_cpu(ppl_hdr->entries[i].pp_size);
+
+		if (!buf_prev)
+			buf_prev = buf + PPL_HEADER_SIZE;
+		tmp = buf_prev;
+		buf_prev = buf;
+		buf = tmp;
+	}
+
+	if (buf_prev) {
+		buf = buf_prev;
+		ppl_hdr = buf_prev;
+	}
+
+	/*
+	 * Update metadata to use mutliple PPLs area (1MB).
+	 * This is done once for all RAID members
+	 */
+	if (info->consistency_policy == CONSISTENCY_POLICY_PPL &&
+	    info->ppl_size != (MULTIPLE_PPL_AREA_SIZE_IMSM >> 9)) {
+		char subarray[20];
+		struct mdinfo *member_dev;
+
+		sprintf(subarray, "%d", info->container_member);
+
+		if (mdmon_running(st->container_devnm))
+			st->update_tail = &st->updates;
+
+		if (st->ss->update_subarray(st, subarray, "ppl", NULL)) {
+			pr_err("Failed to update subarray %s\n",
+			      subarray);
+		} else {
+			if (st->update_tail)
+				flush_metadata_updates(st);
+			else
+				st->ss->sync_metadata(st);
+			info->ppl_size = (MULTIPLE_PPL_AREA_SIZE_IMSM >> 9);
+			for (member_dev = info->devs; member_dev;
+			     member_dev = member_dev->next)
+				member_dev->ppl_size =
+				    (MULTIPLE_PPL_AREA_SIZE_IMSM >> 9);
+		}
+	}
+
+	if (ret == 1) {
+		struct imsm_map *map = get_imsm_map(dev, MAP_X);
+
+		if (map->map_state == IMSM_T_STATE_UNINITIALIZED ||
+		   (map->map_state == IMSM_T_STATE_NORMAL &&
+		   !(dev->vol.dirty & RAIDVOL_DIRTY)) ||
+		   (is_rebuilding(dev) &&
+		    vol_curr_migr_unit(dev) == 0 &&
+		    get_imsm_disk_idx(dev, disk->disk.raid_disk, MAP_1) != idx))
+			ret = st->ss->write_init_ppl(st, info, d->fd);
+		else
+			info->mismatch_cnt++;
+	} else if (ret == 0 &&
+		   ppl_hdr->entries_count == 0 &&
+		   is_rebuilding(dev) &&
+		   info->resync_start == 0) {
+		/*
+		 * The header has no entries - add a single empty entry and
+		 * rewrite the header to prevent the kernel from going into
+		 * resync after an interrupted rebuild.
+		 */
+		ppl_hdr->entries_count = __cpu_to_le32(1);
+		ret = write_ppl_header(info->ppl_sector, d->fd, buf);
+	}
+
+	free(buf_orig);
+
+	return ret;
+}
+
+static int write_init_ppl_imsm_all(struct supertype *st, struct mdinfo *info)
+{
+	struct intel_super *super = st->sb;
+	struct dl *d;
+	int ret = 0;
+
+	if (info->consistency_policy != CONSISTENCY_POLICY_PPL ||
+	    info->array.level != 5)
+		return 0;
+
+	for (d = super->disks; d ; d = d->next) {
+		if (d->index < 0 || is_failed(&d->disk))
+			continue;
+
+		ret = st->ss->write_init_ppl(st, info, d->fd);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+/*******************************************************************************
+ * Function:	write_init_bitmap_imsm_vol
+ * Description:	Write a bitmap header and prepares the area for the bitmap.
+ * Parameters:
+ *	st	: supertype information
+ *	vol_idx	: the volume index to use
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int write_init_bitmap_imsm_vol(struct supertype *st, int vol_idx)
+{
+	struct intel_super *super = st->sb;
+	int prev_current_vol = super->current_vol;
+	struct dl *d;
+	int ret = 0;
+
+	super->current_vol = vol_idx;
+	for (d = super->disks; d; d = d->next) {
+		if (d->index < 0 || is_failed(&d->disk))
+			continue;
+		ret = st->ss->write_bitmap(st, d->fd, NoUpdate);
+		if (ret)
+			break;
+	}
+	super->current_vol = prev_current_vol;
+	return ret;
+}
+
+/*******************************************************************************
+ * Function:	write_init_bitmap_imsm_all
+ * Description:	Write a bitmap header and prepares the area for the bitmap.
+ *		Operation is executed for volumes with CONSISTENCY_POLICY_BITMAP.
+ * Parameters:
+ *	st	: supertype information
+ *	info	: info about the volume where the bitmap should be written
+ *	vol_idx	: the volume index to use
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int write_init_bitmap_imsm_all(struct supertype *st, struct mdinfo *info,
+				      int vol_idx)
+{
+	int ret = 0;
+
+	if (info && (info->consistency_policy == CONSISTENCY_POLICY_BITMAP))
+		ret = write_init_bitmap_imsm_vol(st, vol_idx);
+
+	return ret;
+}
+
+static int write_init_super_imsm(struct supertype *st)
+{
+	struct intel_super *super = st->sb;
+	int current_vol = super->current_vol;
+	int rv = 0;
+	struct mdinfo info;
+
+	getinfo_super_imsm(st, &info, NULL);
+
+	/* we are done with current_vol reset it to point st at the container */
+	super->current_vol = -1;
+
+	if (st->update_tail) {
+		/* queue the recently created array / added disk
+		 * as a metadata update */
+
+		/* determine if we are creating a volume or adding a disk */
+		if (current_vol < 0) {
+			/* in the mgmt (add/remove) disk case we are running
+			 * in mdmon context, so don't close fd's
+			 */
+			rv = mgmt_disk(st);
+		} else {
+			/* adding the second volume to the array */
+			rv = write_init_ppl_imsm_all(st, &info);
+			if (!rv)
+				rv = write_init_bitmap_imsm_all(st, &info, current_vol);
+			if (!rv)
+				rv = create_array(st, current_vol);
+		}
+	} else {
+		struct dl *d;
+		for (d = super->disks; d; d = d->next)
+			Kill(d->devname, NULL, 0, -1, 1);
+		if (current_vol >= 0) {
+			rv = write_init_ppl_imsm_all(st, &info);
+			if (!rv)
+				rv = write_init_bitmap_imsm_all(st, &info, current_vol);
+		}
+
+		if (!rv)
+			rv = write_super_imsm(st, 1);
+	}
+
+	return rv;
+}
+
+static int store_super_imsm(struct supertype *st, int fd)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super ? super->anchor : NULL;
+
+	if (!mpb)
+		return 1;
+
+	if (super->sector_size == 4096)
+		convert_to_4k(super);
+	return store_imsm_mpb(fd, mpb);
+}
+
+static int validate_geometry_imsm_container(struct supertype *st, int level,
+					    int raiddisks,
+					    unsigned long long data_offset,
+					    char *dev,
+					    unsigned long long *freesize,
+					    int verbose)
+{
+	int fd;
+	unsigned long long ldsize;
+	struct intel_super *super = NULL;
+	int rv = 0;
+
+	if (level != LEVEL_CONTAINER)
+		return 0;
+	if (!dev)
+		return 1;
+
+	fd = dev_open(dev, O_RDONLY|O_EXCL);
+	if (!is_fd_valid(fd)) {
+		pr_vrb("imsm: Cannot open %s: %s\n", dev, strerror(errno));
+		return 0;
+	}
+	if (!get_dev_size(fd, dev, &ldsize))
+		goto exit;
+
+	/* capabilities retrieve could be possible
+	 * note that there is no fd for the disks in array.
+	 */
+	super = alloc_super();
+	if (!super)
+		goto exit;
+
+	if (!get_dev_sector_size(fd, NULL, &super->sector_size))
+		goto exit;
+
+	rv = find_intel_hba_capability(fd, super, verbose > 0 ? dev : NULL);
+	if (rv != 0) {
+#if DEBUG
+		char str[256];
+		fd2devname(fd, str);
+		dprintf("fd: %d %s orom: %p rv: %d raiddisk: %d\n",
+			fd, str, super->orom, rv, raiddisks);
+#endif
+		/* no orom/efi or non-intel hba of the disk */
+		rv = 0;
+		goto exit;
+	}
+	if (super->orom) {
+		if (raiddisks > super->orom->tds) {
+			if (verbose)
+				pr_err("%d exceeds maximum number of platform supported disks: %d\n",
+					raiddisks, super->orom->tds);
+			goto exit;
+		}
+		if ((super->orom->attr & IMSM_OROM_ATTR_2TB_DISK) == 0 &&
+		    (ldsize >> 9) >> 32 > 0) {
+			if (verbose)
+				pr_err("%s exceeds maximum platform supported size\n", dev);
+			goto exit;
+		}
+
+		if (super->hba->type == SYS_DEV_VMD ||
+		    super->hba->type == SYS_DEV_NVME) {
+			if (!imsm_is_nvme_namespace_supported(fd, 1)) {
+				if (verbose)
+					pr_err("NVMe namespace %s is not supported by IMSM\n",
+						basename(dev));
+				goto exit;
+			}
+		}
+	}
+	if (freesize)
+		*freesize = avail_size_imsm(st, ldsize >> 9, data_offset);
+	rv = 1;
+exit:
+	if (super)
+		free_imsm(super);
+	close(fd);
+
+	return rv;
+}
+
+static unsigned long long find_size(struct extent *e, int *idx, int num_extents)
+{
+	const unsigned long long base_start = e[*idx].start;
+	unsigned long long end = base_start + e[*idx].size;
+	int i;
+
+	if (base_start == end)
+		return 0;
+
+	*idx = *idx + 1;
+	for (i = *idx; i < num_extents; i++) {
+		/* extend overlapping extents */
+		if (e[i].start >= base_start &&
+		    e[i].start <= end) {
+			if (e[i].size == 0)
+				return 0;
+			if (e[i].start + e[i].size > end)
+				end = e[i].start + e[i].size;
+		} else if (e[i].start > end) {
+			*idx = i;
+			break;
+		}
+	}
+
+	return end - base_start;
+}
+
+static unsigned long long merge_extents(struct intel_super *super, int sum_extents)
+{
+	/* build a composite disk with all known extents and generate a new
+	 * 'maxsize' given the "all disks in an array must share a common start
+	 * offset" constraint
+	 */
+	struct extent *e = xcalloc(sum_extents, sizeof(*e));
+	struct dl *dl;
+	int i, j;
+	int start_extent;
+	unsigned long long pos;
+	unsigned long long start = 0;
+	unsigned long long maxsize;
+	unsigned long reserve;
+
+	/* coalesce and sort all extents. also, check to see if we need to
+	 * reserve space between member arrays
+	 */
+	j = 0;
+	for (dl = super->disks; dl; dl = dl->next) {
+		if (!dl->e)
+			continue;
+		for (i = 0; i < dl->extent_cnt; i++)
+			e[j++] = dl->e[i];
+	}
+	qsort(e, sum_extents, sizeof(*e), cmp_extent);
+
+	/* merge extents */
+	i = 0;
+	j = 0;
+	while (i < sum_extents) {
+		e[j].start = e[i].start;
+		e[j].size = find_size(e, &i, sum_extents);
+		j++;
+		if (e[j-1].size == 0)
+			break;
+	}
+
+	pos = 0;
+	maxsize = 0;
+	start_extent = 0;
+	i = 0;
+	do {
+		unsigned long long esize;
+
+		esize = e[i].start - pos;
+		if (esize >= maxsize) {
+			maxsize = esize;
+			start = pos;
+			start_extent = i;
+		}
+		pos = e[i].start + e[i].size;
+		i++;
+	} while (e[i-1].size);
+	free(e);
+
+	if (maxsize == 0)
+		return 0;
+
+	/* FIXME assumes volume at offset 0 is the first volume in a
+	 * container
+	 */
+	if (start_extent > 0)
+		reserve = IMSM_RESERVED_SECTORS; /* gap between raid regions */
+	else
+		reserve = 0;
+
+	if (maxsize < reserve)
+		return 0;
+
+	super->create_offset = ~((unsigned long long) 0);
+	if (start + reserve > super->create_offset)
+		return 0; /* start overflows create_offset */
+	super->create_offset = start + reserve;
+
+	return maxsize - reserve;
+}
+
+static int is_raid_level_supported(const struct imsm_orom *orom, int level, int raiddisks)
+{
+	if (level < 0 || level == 6 || level == 4)
+		return 0;
+
+	/* if we have an orom prevent invalid raid levels */
+	if (orom)
+		switch (level) {
+		case 0: return imsm_orom_has_raid0(orom);
+		case 1:
+			if (raiddisks > 2)
+				return imsm_orom_has_raid1e(orom);
+			return imsm_orom_has_raid1(orom) && raiddisks == 2;
+		case 10: return imsm_orom_has_raid10(orom) && raiddisks == 4;
+		case 5: return imsm_orom_has_raid5(orom) && raiddisks > 2;
+		}
+	else
+		return 1; /* not on an Intel RAID platform so anything goes */
+
+	return 0;
+}
+
+static int
+active_arrays_by_format(char *name, char* hba, struct md_list **devlist,
+			int dpa, int verbose)
+{
+	struct mdstat_ent *mdstat = mdstat_read(0, 0);
+	struct mdstat_ent *memb;
+	int count = 0;
+	int num = 0;
+	struct md_list *dv;
+	int found;
+
+	for (memb = mdstat ; memb ; memb = memb->next) {
+		if (memb->metadata_version &&
+		    (strncmp(memb->metadata_version, "external:", 9) == 0) &&
+		    (strcmp(&memb->metadata_version[9], name) == 0) &&
+		    !is_subarray(memb->metadata_version+9) &&
+		    memb->members) {
+			struct dev_member *dev = memb->members;
+			int fd = -1;
+			while (dev && !is_fd_valid(fd)) {
+				char *path = xmalloc(strlen(dev->name) + strlen("/dev/") + 1);
+				num = sprintf(path, "%s%s", "/dev/", dev->name);
+				if (num > 0)
+					fd = open(path, O_RDONLY, 0);
+				if (num <= 0 || !is_fd_valid(fd)) {
+					pr_vrb("Cannot open %s: %s\n",
+					       dev->name, strerror(errno));
+				}
+				free(path);
+				dev = dev->next;
+			}
+			found = 0;
+			if (is_fd_valid(fd) && disk_attached_to_hba(fd, hba)) {
+				struct mdstat_ent *vol;
+				for (vol = mdstat ; vol ; vol = vol->next) {
+					if (vol->active > 0 &&
+					    vol->metadata_version &&
+					    is_container_member(vol, memb->devnm)) {
+						found++;
+						count++;
+					}
+				}
+				if (*devlist && (found < dpa)) {
+					dv = xcalloc(1, sizeof(*dv));
+					dv->devname = xmalloc(strlen(memb->devnm) + strlen("/dev/") + 1);
+					sprintf(dv->devname, "%s%s", "/dev/", memb->devnm);
+					dv->found = found;
+					dv->used = 0;
+					dv->next = *devlist;
+					*devlist = dv;
+				}
+			}
+			close_fd(&fd);
+		}
+	}
+	free_mdstat(mdstat);
+	return count;
+}
+
+#ifdef DEBUG_LOOP
+static struct md_list*
+get_loop_devices(void)
+{
+	int i;
+	struct md_list *devlist = NULL;
+	struct md_list *dv;
+
+	for(i = 0; i < 12; i++) {
+		dv = xcalloc(1, sizeof(*dv));
+		dv->devname = xmalloc(40);
+		sprintf(dv->devname, "/dev/loop%d", i);
+		dv->next = devlist;
+		devlist = dv;
+	}
+	return devlist;
+}
+#endif
+
+static struct md_list*
+get_devices(const char *hba_path)
+{
+	struct md_list *devlist = NULL;
+	struct md_list *dv;
+	struct dirent *ent;
+	DIR *dir;
+	int err = 0;
+
+#if DEBUG_LOOP
+	devlist = get_loop_devices();
+	return devlist;
+#endif
+	/* scroll through /sys/dev/block looking for devices attached to
+	 * this hba
+	 */
+	dir = opendir("/sys/dev/block");
+	for (ent = dir ? readdir(dir) : NULL; ent; ent = readdir(dir)) {
+		int fd;
+		char buf[1024];
+		int major, minor;
+		char *path = NULL;
+		if (sscanf(ent->d_name, "%d:%d", &major, &minor) != 2)
+			continue;
+		path = devt_to_devpath(makedev(major, minor), 1, NULL);
+		if (!path)
+			continue;
+		if (!path_attached_to_hba(path, hba_path)) {
+			free(path);
+			path = NULL;
+			continue;
+		}
+		free(path);
+		path = NULL;
+		fd = dev_open(ent->d_name, O_RDONLY);
+		if (is_fd_valid(fd)) {
+			fd2devname(fd, buf);
+			close(fd);
+		} else {
+			pr_err("cannot open device: %s\n",
+				ent->d_name);
+			continue;
+		}
+
+		dv = xcalloc(1, sizeof(*dv));
+		dv->devname = xstrdup(buf);
+		dv->next = devlist;
+		devlist = dv;
+	}
+	if (err) {
+		while(devlist) {
+			dv = devlist;
+			devlist = devlist->next;
+			free(dv->devname);
+			free(dv);
+		}
+	}
+	closedir(dir);
+	return devlist;
+}
+
+static int
+count_volumes_list(struct md_list *devlist, char *homehost,
+		   int verbose, int *found)
+{
+	struct md_list *tmpdev;
+	int count = 0;
+	struct supertype *st;
+
+	/* first walk the list of devices to find a consistent set
+	 * that match the criterea, if that is possible.
+	 * We flag the ones we like with 'used'.
+	 */
+	*found = 0;
+	st = match_metadata_desc_imsm("imsm");
+	if (st == NULL) {
+		pr_vrb("cannot allocate memory for imsm supertype\n");
+		return 0;
+	}
+
+	for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
+		char *devname = tmpdev->devname;
+		dev_t rdev;
+		struct supertype *tst;
+		int dfd;
+		if (tmpdev->used > 1)
+			continue;
+		tst = dup_super(st);
+		if (tst == NULL) {
+			pr_vrb("cannot allocate memory for imsm supertype\n");
+			goto err_1;
+		}
+		tmpdev->container = 0;
+		dfd = dev_open(devname, O_RDONLY|O_EXCL);
+		if (!is_fd_valid(dfd)) {
+			dprintf("cannot open device %s: %s\n",
+				devname, strerror(errno));
+			tmpdev->used = 2;
+		} else if (!fstat_is_blkdev(dfd, devname, &rdev)) {
+			tmpdev->used = 2;
+		} else if (must_be_container(dfd)) {
+			struct supertype *cst;
+			cst = super_by_fd(dfd, NULL);
+			if (cst == NULL) {
+				dprintf("cannot recognize container type %s\n",
+					devname);
+				tmpdev->used = 2;
+			} else if (tst->ss != st->ss) {
+				dprintf("non-imsm container - ignore it: %s\n",
+					devname);
+				tmpdev->used = 2;
+			} else if (!tst->ss->load_container ||
+				   tst->ss->load_container(tst, dfd, NULL))
+				tmpdev->used = 2;
+			else {
+				tmpdev->container = 1;
+			}
+			if (cst)
+				cst->ss->free_super(cst);
+		} else {
+			tmpdev->st_rdev = rdev;
+			if (tst->ss->load_super(tst,dfd, NULL)) {
+				dprintf("no RAID superblock on %s\n",
+					devname);
+				tmpdev->used = 2;
+			} else if (tst->ss->compare_super == NULL) {
+				dprintf("Cannot assemble %s metadata on %s\n",
+					tst->ss->name, devname);
+				tmpdev->used = 2;
+			}
+		}
+		close_fd(&dfd);
+
+		if (tmpdev->used == 2 || tmpdev->used == 4) {
+			/* Ignore unrecognised devices during auto-assembly */
+			goto loop;
+		}
+		else {
+			struct mdinfo info;
+			tst->ss->getinfo_super(tst, &info, NULL);
+
+			if (st->minor_version == -1)
+				st->minor_version = tst->minor_version;
+
+			if (memcmp(info.uuid, uuid_zero,
+				   sizeof(int[4])) == 0) {
+				/* this is a floating spare.  It cannot define
+				 * an array unless there are no more arrays of
+				 * this type to be found.  It can be included
+				 * in an array of this type though.
+				 */
+				tmpdev->used = 3;
+				goto loop;
+			}
+
+			if (st->ss != tst->ss ||
+			    st->minor_version != tst->minor_version ||
+			    st->ss->compare_super(st, tst, 1) != 0) {
+				/* Some mismatch. If exactly one array matches this host,
+				 * we can resolve on that one.
+				 * Or, if we are auto assembling, we just ignore the second
+				 * for now.
+				 */
+				dprintf("superblock on %s doesn't match others - assembly aborted\n",
+					devname);
+				goto loop;
+			}
+			tmpdev->used = 1;
+			*found = 1;
+			dprintf("found: devname: %s\n", devname);
+		}
+	loop:
+		if (tst)
+			tst->ss->free_super(tst);
+	}
+	if (*found != 0) {
+		int err;
+		if ((err = load_super_imsm_all(st, -1, &st->sb, NULL, devlist, 0)) == 0) {
+			struct mdinfo *iter, *head = st->ss->container_content(st, NULL);
+			for (iter = head; iter; iter = iter->next) {
+				dprintf("content->text_version: %s vol\n",
+					iter->text_version);
+				if (iter->array.state & (1<<MD_SB_BLOCK_VOLUME)) {
+					/* do not assemble arrays with unsupported
+					   configurations */
+					dprintf("Cannot activate member %s.\n",
+						iter->text_version);
+				} else
+					count++;
+			}
+			sysfs_free(head);
+
+		} else {
+			dprintf("No valid super block on device list: err: %d %p\n",
+				err, st->sb);
+		}
+	} else {
+		dprintf("no more devices to examine\n");
+	}
+
+	for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
+		if (tmpdev->used == 1 && tmpdev->found) {
+			if (count) {
+				if (count < tmpdev->found)
+					count = 0;
+				else
+					count -= tmpdev->found;
+			}
+		}
+		if (tmpdev->used == 1)
+			tmpdev->used = 4;
+	}
+	err_1:
+	if (st)
+		st->ss->free_super(st);
+	return count;
+}
+
+static int __count_volumes(char *hba_path, int dpa, int verbose,
+			   int cmp_hba_path)
+{
+	struct sys_dev *idev, *intel_devices = find_intel_devices();
+	int count = 0;
+	const struct orom_entry *entry;
+	struct devid_list *dv, *devid_list;
+
+	if (!hba_path)
+		return 0;
+
+	for (idev = intel_devices; idev; idev = idev->next) {
+		if (strstr(idev->path, hba_path))
+			break;
+	}
+
+	if (!idev || !idev->dev_id)
+		return 0;
+
+	entry = get_orom_entry_by_device_id(idev->dev_id);
+
+	if (!entry || !entry->devid_list)
+		return 0;
+
+	devid_list = entry->devid_list;
+	for (dv = devid_list; dv; dv = dv->next) {
+		struct md_list *devlist;
+		struct sys_dev *device = NULL;
+		char *hpath;
+		int found = 0;
+
+		if (cmp_hba_path)
+			device = device_by_id_and_path(dv->devid, hba_path);
+		else
+			device = device_by_id(dv->devid);
+
+		if (device)
+			hpath = device->path;
+		else
+			return 0;
+
+		devlist = get_devices(hpath);
+		/* if no intel devices return zero volumes */
+		if (devlist == NULL)
+			return 0;
+
+		count += active_arrays_by_format("imsm", hpath, &devlist, dpa,
+						 verbose);
+		dprintf("path: %s active arrays: %d\n", hpath, count);
+		if (devlist == NULL)
+			return 0;
+		do  {
+			found = 0;
+			count += count_volumes_list(devlist,
+							NULL,
+							verbose,
+							&found);
+			dprintf("found %d count: %d\n", found, count);
+		} while (found);
+
+		dprintf("path: %s total number of volumes: %d\n", hpath, count);
+
+		while (devlist) {
+			struct md_list *dv = devlist;
+			devlist = devlist->next;
+			free(dv->devname);
+			free(dv);
+		}
+	}
+	return count;
+}
+
+static int count_volumes(struct intel_hba *hba, int dpa, int verbose)
+{
+	if (!hba)
+		return 0;
+	if (hba->type == SYS_DEV_VMD) {
+		struct sys_dev *dev;
+		int count = 0;
+
+		for (dev = find_intel_devices(); dev; dev = dev->next) {
+			if (dev->type == SYS_DEV_VMD)
+				count += __count_volumes(dev->path, dpa,
+							 verbose, 1);
+		}
+		return count;
+	}
+	return __count_volumes(hba->path, dpa, verbose, 0);
+}
+
+static int imsm_default_chunk(const struct imsm_orom *orom)
+{
+	/* up to 512 if the plaform supports it, otherwise the platform max.
+	 * 128 if no platform detected
+	 */
+	int fs = max(7, orom ? fls(orom->sss) : 0);
+
+	return min(512, (1 << fs));
+}
+
+static int
+validate_geometry_imsm_orom(struct intel_super *super, int level, int layout,
+			    int raiddisks, int *chunk, unsigned long long size, int verbose)
+{
+	/* check/set platform and metadata limits/defaults */
+	if (super->orom && raiddisks > super->orom->dpa) {
+		pr_vrb("platform supports a maximum of %d disks per array\n",
+		       super->orom->dpa);
+		return 0;
+	}
+
+	/* capabilities of OROM tested - copied from validate_geometry_imsm_volume */
+	if (!is_raid_level_supported(super->orom, level, raiddisks)) {
+		pr_vrb("platform does not support raid%d with %d disk%s\n",
+			level, raiddisks, raiddisks > 1 ? "s" : "");
+		return 0;
+	}
+
+	if (*chunk == 0 || *chunk == UnSet)
+		*chunk = imsm_default_chunk(super->orom);
+
+	if (super->orom && !imsm_orom_has_chunk(super->orom, *chunk)) {
+		pr_vrb("platform does not support a chunk size of: %d\n", *chunk);
+		return 0;
+	}
+
+	if (layout != imsm_level_to_layout(level)) {
+		if (level == 5)
+			pr_vrb("imsm raid 5 only supports the left-asymmetric layout\n");
+		else if (level == 10)
+			pr_vrb("imsm raid 10 only supports the n2 layout\n");
+		else
+			pr_vrb("imsm unknown layout %#x for this raid level %d\n",
+				layout, level);
+		return 0;
+	}
+
+	if (super->orom && (super->orom->attr & IMSM_OROM_ATTR_2TB) == 0 &&
+			(calc_array_size(level, raiddisks, layout, *chunk, size) >> 32) > 0) {
+		pr_vrb("platform does not support a volume size over 2TB\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+/* validate_geometry_imsm_volume - lifted from validate_geometry_ddf_bvd
+ * FIX ME add ahci details
+ */
+static int validate_geometry_imsm_volume(struct supertype *st, int level,
+					 int layout, int raiddisks, int *chunk,
+					 unsigned long long size,
+					 unsigned long long data_offset,
+					 char *dev,
+					 unsigned long long *freesize,
+					 int verbose)
+{
+	dev_t rdev;
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb;
+	struct dl *dl;
+	unsigned long long pos = 0;
+	unsigned long long maxsize;
+	struct extent *e;
+	int i;
+
+	/* We must have the container info already read in. */
+	if (!super)
+		return 0;
+
+	mpb = super->anchor;
+
+	if (!validate_geometry_imsm_orom(super, level, layout, raiddisks, chunk, size, verbose)) {
+		pr_err("RAID geometry validation failed. Cannot proceed with the action(s).\n");
+		return 0;
+	}
+	if (!dev) {
+		/* General test:  make sure there is space for
+		 * 'raiddisks' device extents of size 'size' at a given
+		 * offset
+		 */
+		unsigned long long minsize = size;
+		unsigned long long start_offset = MaxSector;
+		int dcnt = 0;
+		if (minsize == 0)
+			minsize = MPB_SECTOR_CNT + IMSM_RESERVED_SECTORS;
+		for (dl = super->disks; dl ; dl = dl->next) {
+			int found = 0;
+
+			pos = 0;
+			i = 0;
+			e = get_extents(super, dl, 0);
+			if (!e) continue;
+			do {
+				unsigned long long esize;
+				esize = e[i].start - pos;
+				if (esize >= minsize)
+					found = 1;
+				if (found && start_offset == MaxSector) {
+					start_offset = pos;
+					break;
+				} else if (found && pos != start_offset) {
+					found = 0;
+					break;
+				}
+				pos = e[i].start + e[i].size;
+				i++;
+			} while (e[i-1].size);
+			if (found)
+				dcnt++;
+			free(e);
+		}
+		if (dcnt < raiddisks) {
+			if (verbose)
+				pr_err("imsm: Not enough devices with space for this array (%d < %d)\n",
+					dcnt, raiddisks);
+			return 0;
+		}
+		return 1;
+	}
+
+	/* This device must be a member of the set */
+	if (!stat_is_blkdev(dev, &rdev))
+		return 0;
+	for (dl = super->disks ; dl ; dl = dl->next) {
+		if (dl->major == (int)major(rdev) &&
+		    dl->minor == (int)minor(rdev))
+			break;
+	}
+	if (!dl) {
+		if (verbose)
+			pr_err("%s is not in the same imsm set\n", dev);
+		return 0;
+	} else if (super->orom && dl->index < 0 && mpb->num_raid_devs) {
+		/* If a volume is present then the current creation attempt
+		 * cannot incorporate new spares because the orom may not
+		 * understand this configuration (all member disks must be
+		 * members of each array in the container).
+		 */
+		pr_err("%s is a spare and a volume is already defined for this container\n", dev);
+		pr_err("The option-rom requires all member disks to be a member of all volumes\n");
+		return 0;
+	} else if (super->orom && mpb->num_raid_devs > 0 &&
+		   mpb->num_disks != raiddisks) {
+		pr_err("The option-rom requires all member disks to be a member of all volumes\n");
+		return 0;
+	}
+
+	/* retrieve the largest free space block */
+	e = get_extents(super, dl, 0);
+	maxsize = 0;
+	i = 0;
+	if (e) {
+		do {
+			unsigned long long esize;
+
+			esize = e[i].start - pos;
+			if (esize >= maxsize)
+				maxsize = esize;
+			pos = e[i].start + e[i].size;
+			i++;
+		} while (e[i-1].size);
+		dl->e = e;
+		dl->extent_cnt = i;
+	} else {
+		if (verbose)
+			pr_err("unable to determine free space for: %s\n",
+				dev);
+		return 0;
+	}
+	if (maxsize < size) {
+		if (verbose)
+			pr_err("%s not enough space (%llu < %llu)\n",
+				dev, maxsize, size);
+		return 0;
+	}
+
+	/* count total number of extents for merge */
+	i = 0;
+	for (dl = super->disks; dl; dl = dl->next)
+		if (dl->e)
+			i += dl->extent_cnt;
+
+	maxsize = merge_extents(super, i);
+
+	if (mpb->num_raid_devs > 0 && size && size != maxsize)
+		pr_err("attempting to create a second volume with size less then remaining space.\n");
+
+	if (maxsize < size || maxsize == 0) {
+		if (verbose) {
+			if (maxsize == 0)
+				pr_err("no free space left on device. Aborting...\n");
+			else
+				pr_err("not enough space to create volume of given size (%llu < %llu). Aborting...\n",
+						maxsize, size);
+		}
+		return 0;
+	}
+
+	*freesize = maxsize;
+
+	if (super->orom) {
+		int count = count_volumes(super->hba,
+				      super->orom->dpa, verbose);
+		if (super->orom->vphba <= count) {
+			pr_vrb("platform does not support more than %d raid volumes.\n",
+			       super->orom->vphba);
+			return 0;
+		}
+	}
+	return 1;
+}
+
+static int imsm_get_free_size(struct supertype *st, int raiddisks,
+			 unsigned long long size, int chunk,
+			 unsigned long long *freesize)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->anchor;
+	struct dl *dl;
+	int i;
+	int extent_cnt;
+	struct extent *e;
+	unsigned long long maxsize;
+	unsigned long long minsize;
+	int cnt;
+	int used;
+
+	/* find the largest common start free region of the possible disks */
+	used = 0;
+	extent_cnt = 0;
+	cnt = 0;
+	for (dl = super->disks; dl; dl = dl->next) {
+		dl->raiddisk = -1;
+
+		if (dl->index >= 0)
+			used++;
+
+		/* don't activate new spares if we are orom constrained
+		 * and there is already a volume active in the container
+		 */
+		if (super->orom && dl->index < 0 && mpb->num_raid_devs)
+			continue;
+
+		e = get_extents(super, dl, 0);
+		if (!e)
+			continue;
+		for (i = 1; e[i-1].size; i++)
+			;
+		dl->e = e;
+		dl->extent_cnt = i;
+		extent_cnt += i;
+		cnt++;
+	}
+
+	maxsize = merge_extents(super, extent_cnt);
+	minsize = size;
+	if (size == 0)
+		/* chunk is in K */
+		minsize = chunk * 2;
+
+	if (cnt < raiddisks ||
+	    (super->orom && used && used != raiddisks) ||
+	    maxsize < minsize ||
+	    maxsize == 0) {
+		pr_err("not enough devices with space to create array.\n");
+		return 0; /* No enough free spaces large enough */
+	}
+
+	if (size == 0) {
+		size = maxsize;
+		if (chunk) {
+			size /= 2 * chunk;
+			size *= 2 * chunk;
+		}
+		maxsize = size;
+	}
+	if (mpb->num_raid_devs > 0 && size && size != maxsize)
+		pr_err("attempting to create a second volume with size less then remaining space.\n");
+	cnt = 0;
+	for (dl = super->disks; dl; dl = dl->next)
+		if (dl->e)
+			dl->raiddisk = cnt++;
+
+	*freesize = size;
+
+	dprintf("imsm: imsm_get_free_size() returns : %llu\n", size);
+
+	return 1;
+}
+
+static int reserve_space(struct supertype *st, int raiddisks,
+			 unsigned long long size, int chunk,
+			 unsigned long long *freesize)
+{
+	struct intel_super *super = st->sb;
+	struct dl *dl;
+	int cnt;
+	int rv = 0;
+
+	rv = imsm_get_free_size(st, raiddisks, size, chunk, freesize);
+	if (rv) {
+		cnt = 0;
+		for (dl = super->disks; dl; dl = dl->next)
+			if (dl->e)
+				dl->raiddisk = cnt++;
+		rv = 1;
+	}
+
+	return rv;
+}
+
+static int validate_geometry_imsm(struct supertype *st, int level, int layout,
+				  int raiddisks, int *chunk, unsigned long long size,
+				  unsigned long long data_offset,
+				  char *dev, unsigned long long *freesize,
+				  int consistency_policy, int verbose)
+{
+	int fd, cfd;
+	struct mdinfo *sra;
+	int is_member = 0;
+
+	/* load capability
+	 * if given unused devices create a container
+	 * if given given devices in a container create a member volume
+	 */
+	if (level == LEVEL_CONTAINER)
+		/* Must be a fresh device to add to a container */
+		return validate_geometry_imsm_container(st, level, raiddisks,
+							data_offset, dev,
+							freesize, verbose);
+
+	/*
+	 * Size is given in sectors.
+	 */
+	if (size && (size < 2048)) {
+		pr_err("Given size must be greater than 1M.\n");
+		/* Depends on algorithm in Create.c :
+		 * if container was given (dev == NULL) return -1,
+		 * if block device was given ( dev != NULL) return 0.
+		 */
+		return dev ? -1 : 0;
+	}
+
+	if (!dev) {
+		if (st->sb) {
+			struct intel_super *super = st->sb;
+			if (!validate_geometry_imsm_orom(st->sb, level, layout,
+							 raiddisks, chunk, size,
+							 verbose))
+				return 0;
+			/* we are being asked to automatically layout a
+			 * new volume based on the current contents of
+			 * the container.  If the the parameters can be
+			 * satisfied reserve_space will record the disks,
+			 * start offset, and size of the volume to be
+			 * created.  add_to_super and getinfo_super
+			 * detect when autolayout is in progress.
+			 */
+			/* assuming that freesize is always given when array is
+			   created */
+			if (super->orom && freesize) {
+				int count;
+				count = count_volumes(super->hba,
+						      super->orom->dpa, verbose);
+				if (super->orom->vphba <= count) {
+					pr_vrb("platform does not support more than %d raid volumes.\n",
+					       super->orom->vphba);
+					return 0;
+				}
+			}
+			if (freesize)
+				return reserve_space(st, raiddisks, size,
+						     *chunk, freesize);
+		}
+		return 1;
+	}
+	if (st->sb) {
+		/* creating in a given container */
+		return validate_geometry_imsm_volume(st, level, layout,
+						     raiddisks, chunk, size,
+						     data_offset,
+						     dev, freesize, verbose);
+	}
+
+	/* This device needs to be a device in an 'imsm' container */
+	fd = open(dev, O_RDONLY|O_EXCL, 0);
+
+	if (is_fd_valid(fd)) {
+		pr_vrb("Cannot create this array on device %s\n", dev);
+		close(fd);
+		return 0;
+	}
+	if (errno == EBUSY)
+		fd = open(dev, O_RDONLY, 0);
+
+	if (!is_fd_valid(fd)) {
+		pr_vrb("Cannot open %s: %s\n", dev, strerror(errno));
+		return 0;
+	}
+
+	/* Well, it is in use by someone, maybe an 'imsm' container. */
+	cfd = open_container(fd);
+	close_fd(&fd);
+
+	if (!is_fd_valid(cfd)) {
+		pr_vrb("Cannot use %s: It is busy\n", dev);
+		return 0;
+	}
+	sra = sysfs_read(cfd, NULL, GET_VERSION);
+	if (sra && sra->array.major_version == -1 &&
+	    strcmp(sra->text_version, "imsm") == 0)
+		is_member = 1;
+	sysfs_free(sra);
+	if (is_member) {
+		/* This is a member of a imsm container.  Load the container
+		 * and try to create a volume
+		 */
+		struct intel_super *super;
+
+		if (load_super_imsm_all(st, cfd, (void **) &super, NULL, NULL, 1) == 0) {
+			st->sb = super;
+			strcpy(st->container_devnm, fd2devnm(cfd));
+			close(cfd);
+			return validate_geometry_imsm_volume(st, level, layout,
+							     raiddisks, chunk,
+							     size, data_offset, dev,
+							     freesize, 1)
+				? 1 : -1;
+		}
+	}
+
+	if (verbose)
+		pr_err("failed container membership check\n");
+
+	close(cfd);
+	return 0;
+}
+
+static void default_geometry_imsm(struct supertype *st, int *level, int *layout, int *chunk)
+{
+	struct intel_super *super = st->sb;
+
+	if (level && *level == UnSet)
+		*level = LEVEL_CONTAINER;
+
+	if (level && layout && *layout == UnSet)
+		*layout = imsm_level_to_layout(*level);
+
+	if (chunk && (*chunk == UnSet || *chunk == 0))
+		*chunk = imsm_default_chunk(super->orom);
+}
+
+static void handle_missing(struct intel_super *super, struct imsm_dev *dev);
+
+static int kill_subarray_imsm(struct supertype *st, char *subarray_id)
+{
+	/* remove the subarray currently referenced by subarray_id */
+	__u8 i;
+	struct intel_dev **dp;
+	struct intel_super *super = st->sb;
+	__u8 current_vol = strtoul(subarray_id, NULL, 10);
+	struct imsm_super *mpb = super->anchor;
+
+	if (mpb->num_raid_devs == 0)
+		return 2;
+
+	/* block deletions that would change the uuid of active subarrays
+	 *
+	 * FIXME when immutable ids are available, but note that we'll
+	 * also need to fixup the invalidated/active subarray indexes in
+	 * mdstat
+	 */
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		char subarray[4];
+
+		if (i < current_vol)
+			continue;
+		sprintf(subarray, "%u", i);
+		if (is_subarray_active(subarray, st->devnm)) {
+			pr_err("deleting subarray-%d would change the UUID of active subarray-%d, aborting\n",
+			       current_vol, i);
+
+			return 2;
+		}
+	}
+
+	if (st->update_tail) {
+		struct imsm_update_kill_array *u = xmalloc(sizeof(*u));
+
+		u->type = update_kill_array;
+		u->dev_idx = current_vol;
+		append_metadata_update(st, u, sizeof(*u));
+
+		return 0;
+	}
+
+	for (dp = &super->devlist; *dp;)
+		if ((*dp)->index == current_vol) {
+			*dp = (*dp)->next;
+		} else {
+			handle_missing(super, (*dp)->dev);
+			if ((*dp)->index > current_vol)
+				(*dp)->index--;
+			dp = &(*dp)->next;
+		}
+
+	/* no more raid devices, all active components are now spares,
+	 * but of course failed are still failed
+	 */
+	if (--mpb->num_raid_devs == 0) {
+		struct dl *d;
+
+		for (d = super->disks; d; d = d->next)
+			if (d->index > -2)
+				mark_spare(d);
+	}
+
+	super->updates_pending++;
+
+	return 0;
+}
+
+static int get_rwh_policy_from_update(char *update)
+{
+	if (strcmp(update, "ppl") == 0)
+		return RWH_MULTIPLE_DISTRIBUTED;
+	else if (strcmp(update, "no-ppl") == 0)
+		return RWH_MULTIPLE_OFF;
+	else if (strcmp(update, "bitmap") == 0)
+		return RWH_BITMAP;
+	else if (strcmp(update, "no-bitmap") == 0)
+		return RWH_OFF;
+	return -1;
+}
+
+static int update_subarray_imsm(struct supertype *st, char *subarray,
+				char *update, struct mddev_ident *ident)
+{
+	/* update the subarray currently referenced by ->current_vol */
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->anchor;
+
+	if (strcmp(update, "name") == 0) {
+		char *name = ident->name;
+		char *ep;
+		int vol;
+
+		if (is_subarray_active(subarray, st->devnm)) {
+			pr_err("Unable to update name of active subarray\n");
+			return 2;
+		}
+
+		if (!check_name(super, name, 0))
+			return 2;
+
+		vol = strtoul(subarray, &ep, 10);
+		if (*ep != '\0' || vol >= super->anchor->num_raid_devs)
+			return 2;
+
+		if (st->update_tail) {
+			struct imsm_update_rename_array *u = xmalloc(sizeof(*u));
+
+			u->type = update_rename_array;
+			u->dev_idx = vol;
+			strncpy((char *) u->name, name, MAX_RAID_SERIAL_LEN);
+			u->name[MAX_RAID_SERIAL_LEN-1] = '\0';
+			append_metadata_update(st, u, sizeof(*u));
+		} else {
+			struct imsm_dev *dev;
+			int i, namelen;
+
+			dev = get_imsm_dev(super, vol);
+			memset(dev->volume, '\0', MAX_RAID_SERIAL_LEN);
+			namelen = min((int)strlen(name), MAX_RAID_SERIAL_LEN);
+			memcpy(dev->volume, name, namelen);
+			for (i = 0; i < mpb->num_raid_devs; i++) {
+				dev = get_imsm_dev(super, i);
+				handle_missing(super, dev);
+			}
+			super->updates_pending++;
+		}
+	} else if (get_rwh_policy_from_update(update) != -1) {
+		int new_policy;
+		char *ep;
+		int vol = strtoul(subarray, &ep, 10);
+
+		if (*ep != '\0' || vol >= super->anchor->num_raid_devs)
+			return 2;
+
+		new_policy = get_rwh_policy_from_update(update);
+
+		if (st->update_tail) {
+			struct imsm_update_rwh_policy *u = xmalloc(sizeof(*u));
+
+			u->type = update_rwh_policy;
+			u->dev_idx = vol;
+			u->new_policy = new_policy;
+			append_metadata_update(st, u, sizeof(*u));
+		} else {
+			struct imsm_dev *dev;
+
+			dev = get_imsm_dev(super, vol);
+			dev->rwh_policy = new_policy;
+			super->updates_pending++;
+		}
+		if (new_policy == RWH_BITMAP)
+			return write_init_bitmap_imsm_vol(st, vol);
+	} else
+		return 2;
+
+	return 0;
+}
+
+static bool is_gen_migration(struct imsm_dev *dev)
+{
+	if (dev && dev->vol.migr_state &&
+	    migr_type(dev) == MIGR_GEN_MIGR)
+		return true;
+
+	return false;
+}
+
+static int is_rebuilding(struct imsm_dev *dev)
+{
+	struct imsm_map *migr_map;
+
+	if (!dev->vol.migr_state)
+		return 0;
+
+	if (migr_type(dev) != MIGR_REBUILD)
+		return 0;
+
+	migr_map = get_imsm_map(dev, MAP_1);
+
+	if (migr_map->map_state == IMSM_T_STATE_DEGRADED)
+		return 1;
+	else
+		return 0;
+}
+
+static int is_initializing(struct imsm_dev *dev)
+{
+	struct imsm_map *migr_map;
+
+	if (!dev->vol.migr_state)
+		return 0;
+
+	if (migr_type(dev) != MIGR_INIT)
+		return 0;
+
+	migr_map = get_imsm_map(dev, MAP_1);
+
+	if (migr_map->map_state == IMSM_T_STATE_UNINITIALIZED)
+		return 1;
+
+	return 0;
+}
+
+static void update_recovery_start(struct intel_super *super,
+					struct imsm_dev *dev,
+					struct mdinfo *array)
+{
+	struct mdinfo *rebuild = NULL;
+	struct mdinfo *d;
+	__u32 units;
+
+	if (!is_rebuilding(dev))
+		return;
+
+	/* Find the rebuild target, but punt on the dual rebuild case */
+	for (d = array->devs; d; d = d->next)
+		if (d->recovery_start == 0) {
+			if (rebuild)
+				return;
+			rebuild = d;
+		}
+
+	if (!rebuild) {
+		/* (?) none of the disks are marked with
+		 * IMSM_ORD_REBUILD, so assume they are missing and the
+		 * disk_ord_tbl was not correctly updated
+		 */
+		dprintf("failed to locate out-of-sync disk\n");
+		return;
+	}
+
+	units = vol_curr_migr_unit(dev);
+	rebuild->recovery_start = units * blocks_per_migr_unit(super, dev);
+}
+
+static int recover_backup_imsm(struct supertype *st, struct mdinfo *info);
+
+static struct mdinfo *container_content_imsm(struct supertype *st, char *subarray)
+{
+	/* Given a container loaded by load_super_imsm_all,
+	 * extract information about all the arrays into
+	 * an mdinfo tree.
+	 * If 'subarray' is given, just extract info about that array.
+	 *
+	 * For each imsm_dev create an mdinfo, fill it in,
+	 *  then look for matching devices in super->disks
+	 *  and create appropriate device mdinfo.
+	 */
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->anchor;
+	struct mdinfo *rest = NULL;
+	unsigned int i;
+	int sb_errors = 0;
+	struct dl *d;
+	int spare_disks = 0;
+	int current_vol = super->current_vol;
+
+	/* do not assemble arrays when not all attributes are supported */
+	if (imsm_check_attributes(mpb->attributes) == 0) {
+		sb_errors = 1;
+		pr_err("Unsupported attributes in IMSM metadata.Arrays activation is blocked.\n");
+	}
+
+	/* count spare devices, not used in maps
+	 */
+	for (d = super->disks; d; d = d->next)
+		if (d->index == -1)
+			spare_disks++;
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev;
+		struct imsm_map *map;
+		struct imsm_map *map2;
+		struct mdinfo *this;
+		int slot;
+		int chunk;
+		char *ep;
+		int level;
+
+		if (subarray &&
+		    (i != strtoul(subarray, &ep, 10) || *ep != '\0'))
+			continue;
+
+		dev = get_imsm_dev(super, i);
+		map = get_imsm_map(dev, MAP_0);
+		map2 = get_imsm_map(dev, MAP_1);
+		level = get_imsm_raid_level(map);
+
+		/* do not publish arrays that are in the middle of an
+		 * unsupported migration
+		 */
+		if (dev->vol.migr_state &&
+		    (migr_type(dev) == MIGR_STATE_CHANGE)) {
+			pr_err("cannot assemble volume '%.16s': unsupported migration in progress\n",
+				dev->volume);
+			continue;
+		}
+		/* do not publish arrays that are not support by controller's
+		 * OROM/EFI
+		 */
+
+		this = xmalloc(sizeof(*this));
+
+		super->current_vol = i;
+		getinfo_super_imsm_volume(st, this, NULL);
+		this->next = rest;
+		chunk = __le16_to_cpu(map->blocks_per_strip) >> 1;
+		/* mdadm does not support all metadata features- set the bit in all arrays state */
+		if (!validate_geometry_imsm_orom(super,
+						 level, /* RAID level */
+						 imsm_level_to_layout(level),
+						 map->num_members, /* raid disks */
+						 &chunk, imsm_dev_size(dev),
+						 1 /* verbose */)) {
+			pr_err("IMSM RAID geometry validation failed.  Array %s activation is blocked.\n",
+				dev->volume);
+			this->array.state |=
+			  (1<<MD_SB_BLOCK_CONTAINER_RESHAPE) |
+			  (1<<MD_SB_BLOCK_VOLUME);
+		}
+
+		/* if array has bad blocks, set suitable bit in all arrays state */
+		if (sb_errors)
+			this->array.state |=
+			  (1<<MD_SB_BLOCK_CONTAINER_RESHAPE) |
+			  (1<<MD_SB_BLOCK_VOLUME);
+
+		for (slot = 0 ; slot <  map->num_members; slot++) {
+			unsigned long long recovery_start;
+			struct mdinfo *info_d;
+			struct dl *d;
+			int idx;
+			int skip;
+			__u32 ord;
+			int missing = 0;
+
+			skip = 0;
+			idx = get_imsm_disk_idx(dev, slot, MAP_0);
+			ord = get_imsm_ord_tbl_ent(dev, slot, MAP_X);
+			for (d = super->disks; d ; d = d->next)
+				if (d->index == idx)
+					break;
+
+			recovery_start = MaxSector;
+			if (d == NULL)
+				skip = 1;
+			if (d && is_failed(&d->disk))
+				skip = 1;
+			if (!skip && (ord & IMSM_ORD_REBUILD))
+				recovery_start = 0;
+			if (!(ord & IMSM_ORD_REBUILD))
+				this->array.working_disks++;
+			/*
+			 * if we skip some disks the array will be assmebled degraded;
+			 * reset resync start to avoid a dirty-degraded
+			 * situation when performing the intial sync
+			 */
+			if (skip)
+				missing++;
+
+			if (!(dev->vol.dirty & RAIDVOL_DIRTY)) {
+				if ((!able_to_resync(level, missing) ||
+				     recovery_start == 0))
+					this->resync_start = MaxSector;
+			}
+
+			if (skip)
+				continue;
+
+			info_d = xcalloc(1, sizeof(*info_d));
+			info_d->next = this->devs;
+			this->devs = info_d;
+
+			info_d->disk.number = d->index;
+			info_d->disk.major = d->major;
+			info_d->disk.minor = d->minor;
+			info_d->disk.raid_disk = slot;
+			info_d->recovery_start = recovery_start;
+			if (map2) {
+				if (slot < map2->num_members)
+					info_d->disk.state = (1 << MD_DISK_ACTIVE);
+				else
+					this->array.spare_disks++;
+			} else {
+				if (slot < map->num_members)
+					info_d->disk.state = (1 << MD_DISK_ACTIVE);
+				else
+					this->array.spare_disks++;
+			}
+
+			info_d->events = __le32_to_cpu(mpb->generation_num);
+			info_d->data_offset = pba_of_lba0(map);
+			info_d->component_size = calc_component_size(map, dev);
+
+			if (map->raid_level == 5) {
+				info_d->ppl_sector = this->ppl_sector;
+				info_d->ppl_size = this->ppl_size;
+				if (this->consistency_policy == CONSISTENCY_POLICY_PPL &&
+				    recovery_start == 0)
+					this->resync_start = 0;
+			}
+
+			info_d->bb.supported = 1;
+			get_volume_badblocks(super->bbm_log, ord_to_idx(ord),
+					     info_d->data_offset,
+					     info_d->component_size,
+					     &info_d->bb);
+		}
+		/* now that the disk list is up-to-date fixup recovery_start */
+		update_recovery_start(super, dev, this);
+		this->array.spare_disks += spare_disks;
+
+		/* check for reshape */
+		if (this->reshape_active == 1)
+			recover_backup_imsm(st, this);
+		rest = this;
+	}
+
+	super->current_vol = current_vol;
+	return rest;
+}
+
+static __u8 imsm_check_degraded(struct intel_super *super, struct imsm_dev *dev,
+				int failed, int look_in_map)
+{
+	struct imsm_map *map;
+
+	map = get_imsm_map(dev, look_in_map);
+
+	if (!failed)
+		return map->map_state == IMSM_T_STATE_UNINITIALIZED ?
+			IMSM_T_STATE_UNINITIALIZED : IMSM_T_STATE_NORMAL;
+
+	switch (get_imsm_raid_level(map)) {
+	case 0:
+		return IMSM_T_STATE_FAILED;
+		break;
+	case 1:
+		if (failed < map->num_members)
+			return IMSM_T_STATE_DEGRADED;
+		else
+			return IMSM_T_STATE_FAILED;
+		break;
+	case 10:
+	{
+		/**
+		 * check to see if any mirrors have failed, otherwise we
+		 * are degraded.  Even numbered slots are mirrored on
+		 * slot+1
+		 */
+		int i;
+		/* gcc -Os complains that this is unused */
+		int insync = insync;
+
+		for (i = 0; i < map->num_members; i++) {
+			__u32 ord = get_imsm_ord_tbl_ent(dev, i, MAP_X);
+			int idx = ord_to_idx(ord);
+			struct imsm_disk *disk;
+
+			/* reset the potential in-sync count on even-numbered
+			 * slots.  num_copies is always 2 for imsm raid10
+			 */
+			if ((i & 1) == 0)
+				insync = 2;
+
+			disk = get_imsm_disk(super, idx);
+			if (!disk || is_failed(disk) || ord & IMSM_ORD_REBUILD)
+				insync--;
+
+			/* no in-sync disks left in this mirror the
+			 * array has failed
+			 */
+			if (insync == 0)
+				return IMSM_T_STATE_FAILED;
+		}
+
+		return IMSM_T_STATE_DEGRADED;
+	}
+	case 5:
+		if (failed < 2)
+			return IMSM_T_STATE_DEGRADED;
+		else
+			return IMSM_T_STATE_FAILED;
+		break;
+	default:
+		break;
+	}
+
+	return map->map_state;
+}
+
+static int imsm_count_failed(struct intel_super *super, struct imsm_dev *dev,
+			     int look_in_map)
+{
+	int i;
+	int failed = 0;
+	struct imsm_disk *disk;
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	struct imsm_map *prev = get_imsm_map(dev, MAP_1);
+	struct imsm_map *map_for_loop;
+	__u32 ord;
+	int idx;
+	int idx_1;
+
+	/* at the beginning of migration we set IMSM_ORD_REBUILD on
+	 * disks that are being rebuilt.  New failures are recorded to
+	 * map[0].  So we look through all the disks we started with and
+	 * see if any failures are still present, or if any new ones
+	 * have arrived
+	 */
+	map_for_loop = map;
+	if (prev && (map->num_members < prev->num_members))
+		map_for_loop = prev;
+
+	for (i = 0; i < map_for_loop->num_members; i++) {
+		idx_1 = -255;
+		/* when MAP_X is passed both maps failures are counted
+		 */
+		if (prev &&
+		    (look_in_map == MAP_1 || look_in_map == MAP_X) &&
+		    i < prev->num_members) {
+			ord = __le32_to_cpu(prev->disk_ord_tbl[i]);
+			idx_1 = ord_to_idx(ord);
+
+			disk = get_imsm_disk(super, idx_1);
+			if (!disk || is_failed(disk) || ord & IMSM_ORD_REBUILD)
+				failed++;
+		}
+		if ((look_in_map == MAP_0 || look_in_map == MAP_X) &&
+		    i < map->num_members) {
+			ord = __le32_to_cpu(map->disk_ord_tbl[i]);
+			idx = ord_to_idx(ord);
+
+			if (idx != idx_1) {
+				disk = get_imsm_disk(super, idx);
+				if (!disk || is_failed(disk) ||
+				    ord & IMSM_ORD_REBUILD)
+					failed++;
+			}
+		}
+	}
+
+	return failed;
+}
+
+static int imsm_open_new(struct supertype *c, struct active_array *a,
+			 int inst)
+{
+	struct intel_super *super = c->sb;
+	struct imsm_super *mpb = super->anchor;
+	struct imsm_update_prealloc_bb_mem u;
+
+	if (inst >= mpb->num_raid_devs) {
+		pr_err("subarry index %d, out of range\n", inst);
+		return -ENODEV;
+	}
+
+	dprintf("imsm: open_new %d\n", inst);
+	a->info.container_member = inst;
+
+	u.type = update_prealloc_badblocks_mem;
+	imsm_update_metadata_locally(c, &u, sizeof(u));
+
+	return 0;
+}
+
+static int is_resyncing(struct imsm_dev *dev)
+{
+	struct imsm_map *migr_map;
+
+	if (!dev->vol.migr_state)
+		return 0;
+
+	if (migr_type(dev) == MIGR_INIT ||
+	    migr_type(dev) == MIGR_REPAIR)
+		return 1;
+
+	if (migr_type(dev) == MIGR_GEN_MIGR)
+		return 0;
+
+	migr_map = get_imsm_map(dev, MAP_1);
+
+	if (migr_map->map_state == IMSM_T_STATE_NORMAL &&
+	    dev->vol.migr_type != MIGR_GEN_MIGR)
+		return 1;
+	else
+		return 0;
+}
+
+/* return true if we recorded new information */
+static int mark_failure(struct intel_super *super,
+			struct imsm_dev *dev, struct imsm_disk *disk, int idx)
+{
+	__u32 ord;
+	int slot;
+	struct imsm_map *map;
+	char buf[MAX_RAID_SERIAL_LEN+3];
+	unsigned int len, shift = 0;
+
+	/* new failures are always set in map[0] */
+	map = get_imsm_map(dev, MAP_0);
+
+	slot = get_imsm_disk_slot(map, idx);
+	if (slot < 0)
+		return 0;
+
+	ord = __le32_to_cpu(map->disk_ord_tbl[slot]);
+	if (is_failed(disk) && (ord & IMSM_ORD_REBUILD))
+		return 0;
+
+	memcpy(buf, disk->serial, MAX_RAID_SERIAL_LEN);
+	buf[MAX_RAID_SERIAL_LEN] = '\000';
+	strcat(buf, ":0");
+	if ((len = strlen(buf)) >= MAX_RAID_SERIAL_LEN)
+		shift = len - MAX_RAID_SERIAL_LEN + 1;
+	memcpy(disk->serial, &buf[shift], len + 1 - shift);
+
+	disk->status |= FAILED_DISK;
+	set_imsm_ord_tbl_ent(map, slot, idx | IMSM_ORD_REBUILD);
+	/* mark failures in second map if second map exists and this disk
+	 * in this slot.
+	 * This is valid for migration, initialization and rebuild
+	 */
+	if (dev->vol.migr_state) {
+		struct imsm_map *map2 = get_imsm_map(dev, MAP_1);
+		int slot2 = get_imsm_disk_slot(map2, idx);
+
+		if (slot2 < map2->num_members && slot2 >= 0)
+			set_imsm_ord_tbl_ent(map2, slot2,
+					     idx | IMSM_ORD_REBUILD);
+	}
+	if (map->failed_disk_num == 0xff ||
+		(!is_rebuilding(dev) && map->failed_disk_num > slot))
+		map->failed_disk_num = slot;
+
+	clear_disk_badblocks(super->bbm_log, ord_to_idx(ord));
+
+	return 1;
+}
+
+static void mark_missing(struct intel_super *super,
+			 struct imsm_dev *dev, struct imsm_disk *disk, int idx)
+{
+	mark_failure(super, dev, disk, idx);
+
+	if (disk->scsi_id == __cpu_to_le32(~(__u32)0))
+		return;
+
+	disk->scsi_id = __cpu_to_le32(~(__u32)0);
+	memmove(&disk->serial[0], &disk->serial[1], MAX_RAID_SERIAL_LEN - 1);
+}
+
+static void handle_missing(struct intel_super *super, struct imsm_dev *dev)
+{
+	struct dl *dl;
+
+	if (!super->missing)
+		return;
+
+	/* When orom adds replacement for missing disk it does
+	 * not remove entry of missing disk, but just updates map with
+	 * new added disk. So it is not enough just to test if there is
+	 * any missing disk, we have to look if there are any failed disks
+	 * in map to stop migration */
+
+	dprintf("imsm: mark missing\n");
+	/* end process for initialization and rebuild only
+	 */
+	if (is_gen_migration(dev) == false) {
+		int failed = imsm_count_failed(super, dev, MAP_0);
+
+		if (failed) {
+			__u8 map_state;
+			struct imsm_map *map = get_imsm_map(dev, MAP_0);
+			struct imsm_map *map1;
+			int i, ord, ord_map1;
+			int rebuilt = 1;
+
+			for (i = 0; i < map->num_members; i++) {
+				ord = get_imsm_ord_tbl_ent(dev, i, MAP_0);
+				if (!(ord & IMSM_ORD_REBUILD))
+					continue;
+
+				map1 = get_imsm_map(dev, MAP_1);
+				if (!map1)
+					continue;
+
+				ord_map1 = __le32_to_cpu(map1->disk_ord_tbl[i]);
+				if (ord_map1 & IMSM_ORD_REBUILD)
+					rebuilt = 0;
+			}
+
+			if (rebuilt) {
+				map_state = imsm_check_degraded(super, dev,
+								failed, MAP_0);
+				end_migration(dev, super, map_state);
+			}
+		}
+	}
+	for (dl = super->missing; dl; dl = dl->next)
+		mark_missing(super, dev, &dl->disk, dl->index);
+	super->updates_pending++;
+}
+
+static unsigned long long imsm_set_array_size(struct imsm_dev *dev,
+					      long long new_size)
+{
+	unsigned long long array_blocks;
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	int used_disks = imsm_num_data_members(map);
+
+	if (used_disks == 0) {
+		/* when problems occures
+		 * return current array_blocks value
+		 */
+		array_blocks = imsm_dev_size(dev);
+
+		return array_blocks;
+	}
+
+	/* set array size in metadata
+	 */
+	if (new_size <= 0)
+		/* OLCE size change is caused by added disks
+		 */
+		array_blocks = per_dev_array_size(map) * used_disks;
+	else
+		/* Online Volume Size Change
+		 * Using  available free space
+		 */
+		array_blocks = new_size;
+
+	array_blocks = round_size_to_mb(array_blocks, used_disks);
+	set_imsm_dev_size(dev, array_blocks);
+
+	return array_blocks;
+}
+
+static void imsm_set_disk(struct active_array *a, int n, int state);
+
+static void imsm_progress_container_reshape(struct intel_super *super)
+{
+	/* if no device has a migr_state, but some device has a
+	 * different number of members than the previous device, start
+	 * changing the number of devices in this device to match
+	 * previous.
+	 */
+	struct imsm_super *mpb = super->anchor;
+	int prev_disks = -1;
+	int i;
+	int copy_map_size;
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		struct imsm_dev *dev = get_imsm_dev(super, i);
+		struct imsm_map *map = get_imsm_map(dev, MAP_0);
+		struct imsm_map *map2;
+		int prev_num_members;
+
+		if (dev->vol.migr_state)
+			return;
+
+		if (prev_disks == -1)
+			prev_disks = map->num_members;
+		if (prev_disks == map->num_members)
+			continue;
+
+		/* OK, this array needs to enter reshape mode.
+		 * i.e it needs a migr_state
+		 */
+
+		copy_map_size = sizeof_imsm_map(map);
+		prev_num_members = map->num_members;
+		map->num_members = prev_disks;
+		dev->vol.migr_state = 1;
+		set_vol_curr_migr_unit(dev, 0);
+		set_migr_type(dev, MIGR_GEN_MIGR);
+		for (i = prev_num_members;
+		     i < map->num_members; i++)
+			set_imsm_ord_tbl_ent(map, i, i);
+		map2 = get_imsm_map(dev, MAP_1);
+		/* Copy the current map */
+		memcpy(map2, map, copy_map_size);
+		map2->num_members = prev_num_members;
+
+		imsm_set_array_size(dev, -1);
+		super->clean_migration_record_by_mdmon = 1;
+		super->updates_pending++;
+	}
+}
+
+/* Handle dirty -> clean transititions, resync and reshape.  Degraded and rebuild
+ * states are handled in imsm_set_disk() with one exception, when a
+ * resync is stopped due to a new failure this routine will set the
+ * 'degraded' state for the array.
+ */
+static int imsm_set_array_state(struct active_array *a, int consistent)
+{
+	int inst = a->info.container_member;
+	struct intel_super *super = a->container->sb;
+	struct imsm_dev *dev = get_imsm_dev(super, inst);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	int failed = imsm_count_failed(super, dev, MAP_0);
+	__u8 map_state = imsm_check_degraded(super, dev, failed, MAP_0);
+	__u32 blocks_per_unit;
+
+	if (dev->vol.migr_state &&
+	    dev->vol.migr_type  == MIGR_GEN_MIGR) {
+		/* array state change is blocked due to reshape action
+		 * We might need to
+		 * - abort the reshape (if last_checkpoint is 0 and action!= reshape)
+		 * - finish the reshape (if last_checkpoint is big and action != reshape)
+		 * - update vol_curr_migr_unit
+		 */
+		if (a->curr_action == reshape) {
+			/* still reshaping, maybe update vol_curr_migr_unit */
+			goto mark_checkpoint;
+		} else {
+			if (a->last_checkpoint == 0 && a->prev_action == reshape) {
+				/* for some reason we aborted the reshape.
+				 *
+				 * disable automatic metadata rollback
+				 * user action is required to recover process
+				 */
+				if (0) {
+					struct imsm_map *map2 =
+						get_imsm_map(dev, MAP_1);
+					dev->vol.migr_state = 0;
+					set_migr_type(dev, 0);
+					set_vol_curr_migr_unit(dev, 0);
+					memcpy(map, map2,
+					       sizeof_imsm_map(map2));
+					super->updates_pending++;
+				}
+			}
+			if (a->last_checkpoint >= a->info.component_size) {
+				unsigned long long array_blocks;
+				int used_disks;
+				struct mdinfo *mdi;
+
+				used_disks = imsm_num_data_members(map);
+				if (used_disks > 0) {
+					array_blocks =
+						per_dev_array_size(map) *
+						used_disks;
+					array_blocks =
+						round_size_to_mb(array_blocks,
+								 used_disks);
+					a->info.custom_array_size = array_blocks;
+					/* encourage manager to update array
+					 * size
+					 */
+
+					a->check_reshape = 1;
+				}
+				/* finalize online capacity expansion/reshape */
+				for (mdi = a->info.devs; mdi; mdi = mdi->next)
+					imsm_set_disk(a,
+						      mdi->disk.raid_disk,
+						      mdi->curr_state);
+
+				imsm_progress_container_reshape(super);
+			}
+		}
+	}
+
+	/* before we activate this array handle any missing disks */
+	if (consistent == 2)
+		handle_missing(super, dev);
+
+	if (consistent == 2 &&
+	    (!is_resync_complete(&a->info) ||
+	     map_state != IMSM_T_STATE_NORMAL ||
+	     dev->vol.migr_state))
+		consistent = 0;
+
+	if (is_resync_complete(&a->info)) {
+		/* complete intialization / resync,
+		 * recovery and interrupted recovery is completed in
+		 * ->set_disk
+		 */
+		if (is_resyncing(dev)) {
+			dprintf("imsm: mark resync done\n");
+			end_migration(dev, super, map_state);
+			super->updates_pending++;
+			a->last_checkpoint = 0;
+		}
+	} else if ((!is_resyncing(dev) && !failed) &&
+		   (imsm_reshape_blocks_arrays_changes(super) == 0)) {
+		/* mark the start of the init process if nothing is failed */
+		dprintf("imsm: mark resync start\n");
+		if (map->map_state == IMSM_T_STATE_UNINITIALIZED)
+			migrate(dev, super, IMSM_T_STATE_NORMAL, MIGR_INIT);
+		else
+			migrate(dev, super, IMSM_T_STATE_NORMAL, MIGR_REPAIR);
+		super->updates_pending++;
+	}
+
+mark_checkpoint:
+	/* skip checkpointing for general migration,
+	 * it is controlled in mdadm
+	 */
+	if (is_gen_migration(dev))
+		goto skip_mark_checkpoint;
+
+	/* check if we can update vol_curr_migr_unit from resync_start,
+	 * recovery_start
+	 */
+	blocks_per_unit = blocks_per_migr_unit(super, dev);
+	if (blocks_per_unit) {
+		set_vol_curr_migr_unit(dev,
+				       a->last_checkpoint / blocks_per_unit);
+		dprintf("imsm: mark checkpoint (%llu)\n",
+			vol_curr_migr_unit(dev));
+		super->updates_pending++;
+	}
+
+skip_mark_checkpoint:
+	/* mark dirty / clean */
+	if (((dev->vol.dirty & RAIDVOL_DIRTY) && consistent) ||
+	    (!(dev->vol.dirty & RAIDVOL_DIRTY) && !consistent)) {
+		dprintf("imsm: mark '%s'\n", consistent ? "clean" : "dirty");
+		if (consistent) {
+			dev->vol.dirty = RAIDVOL_CLEAN;
+		} else {
+			dev->vol.dirty = RAIDVOL_DIRTY;
+			if (dev->rwh_policy == RWH_DISTRIBUTED ||
+			    dev->rwh_policy == RWH_MULTIPLE_DISTRIBUTED)
+				dev->vol.dirty |= RAIDVOL_DSRECORD_VALID;
+		}
+		super->updates_pending++;
+	}
+
+	return consistent;
+}
+
+static int imsm_disk_slot_to_ord(struct active_array *a, int slot)
+{
+	int inst = a->info.container_member;
+	struct intel_super *super = a->container->sb;
+	struct imsm_dev *dev = get_imsm_dev(super, inst);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+
+	if (slot > map->num_members) {
+		pr_err("imsm: imsm_disk_slot_to_ord %d out of range 0..%d\n",
+		       slot, map->num_members - 1);
+		return -1;
+	}
+
+	if (slot < 0)
+		return -1;
+
+	return get_imsm_ord_tbl_ent(dev, slot, MAP_0);
+}
+
+static void imsm_set_disk(struct active_array *a, int n, int state)
+{
+	int inst = a->info.container_member;
+	struct intel_super *super = a->container->sb;
+	struct imsm_dev *dev = get_imsm_dev(super, inst);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	struct imsm_disk *disk;
+	struct mdinfo *mdi;
+	int recovery_not_finished = 0;
+	int failed;
+	int ord;
+	__u8 map_state;
+	int rebuild_done = 0;
+	int i;
+
+	ord = get_imsm_ord_tbl_ent(dev, n, MAP_X);
+	if (ord < 0)
+		return;
+
+	dprintf("imsm: set_disk %d:%x\n", n, state);
+	disk = get_imsm_disk(super, ord_to_idx(ord));
+
+	/* check for new failures */
+	if (disk && (state & DS_FAULTY)) {
+		if (mark_failure(super, dev, disk, ord_to_idx(ord)))
+			super->updates_pending++;
+	}
+
+	/* check if in_sync */
+	if (state & DS_INSYNC && ord & IMSM_ORD_REBUILD && is_rebuilding(dev)) {
+		struct imsm_map *migr_map = get_imsm_map(dev, MAP_1);
+
+		set_imsm_ord_tbl_ent(migr_map, n, ord_to_idx(ord));
+		rebuild_done = 1;
+		super->updates_pending++;
+	}
+
+	failed = imsm_count_failed(super, dev, MAP_0);
+	map_state = imsm_check_degraded(super, dev, failed, MAP_0);
+
+	/* check if recovery complete, newly degraded, or failed */
+	dprintf("imsm: Detected transition to state ");
+	switch (map_state) {
+	case IMSM_T_STATE_NORMAL: /* transition to normal state */
+		dprintf("normal: ");
+		if (is_rebuilding(dev)) {
+			dprintf_cont("while rebuilding");
+			/* check if recovery is really finished */
+			for (mdi = a->info.devs; mdi ; mdi = mdi->next)
+				if (mdi->recovery_start != MaxSector) {
+					recovery_not_finished = 1;
+					break;
+				}
+			if (recovery_not_finished) {
+				dprintf_cont("\n");
+				dprintf("Rebuild has not finished yet, state not changed");
+				if (a->last_checkpoint < mdi->recovery_start) {
+					a->last_checkpoint = mdi->recovery_start;
+					super->updates_pending++;
+				}
+				break;
+			}
+			end_migration(dev, super, map_state);
+			map->failed_disk_num = ~0;
+			super->updates_pending++;
+			a->last_checkpoint = 0;
+			break;
+		}
+		if (is_gen_migration(dev)) {
+			dprintf_cont("while general migration");
+			if (a->last_checkpoint >= a->info.component_size)
+				end_migration(dev, super, map_state);
+			else
+				map->map_state = map_state;
+			map->failed_disk_num = ~0;
+			super->updates_pending++;
+			break;
+		}
+	break;
+	case IMSM_T_STATE_DEGRADED: /* transition to degraded state */
+		dprintf_cont("degraded: ");
+		if (map->map_state != map_state && !dev->vol.migr_state) {
+			dprintf_cont("mark degraded");
+			map->map_state = map_state;
+			super->updates_pending++;
+			a->last_checkpoint = 0;
+			break;
+		}
+		if (is_rebuilding(dev)) {
+			dprintf_cont("while rebuilding ");
+			if (state & DS_FAULTY)  {
+				dprintf_cont("removing failed drive ");
+				if (n == map->failed_disk_num) {
+					dprintf_cont("end migration");
+					end_migration(dev, super, map_state);
+					a->last_checkpoint = 0;
+				} else {
+					dprintf_cont("fail detected during rebuild, changing map state");
+					map->map_state = map_state;
+				}
+				super->updates_pending++;
+			}
+
+			if (!rebuild_done)
+				break;
+
+			/* check if recovery is really finished */
+			for (mdi = a->info.devs; mdi ; mdi = mdi->next)
+				if (mdi->recovery_start != MaxSector) {
+					recovery_not_finished = 1;
+					break;
+				}
+			if (recovery_not_finished) {
+				dprintf_cont("\n");
+				dprintf_cont("Rebuild has not finished yet");
+				if (a->last_checkpoint < mdi->recovery_start) {
+					a->last_checkpoint =
+						mdi->recovery_start;
+					super->updates_pending++;
+				}
+				break;
+			}
+
+			dprintf_cont(" Rebuild done, still degraded");
+			end_migration(dev, super, map_state);
+			a->last_checkpoint = 0;
+			super->updates_pending++;
+
+			for (i = 0; i < map->num_members; i++) {
+				int idx = get_imsm_ord_tbl_ent(dev, i, MAP_0);
+
+				if (idx & IMSM_ORD_REBUILD)
+					map->failed_disk_num = i;
+			}
+			super->updates_pending++;
+			break;
+		}
+		if (is_gen_migration(dev)) {
+			dprintf_cont("while general migration");
+			if (a->last_checkpoint >= a->info.component_size)
+				end_migration(dev, super, map_state);
+			else {
+				map->map_state = map_state;
+				manage_second_map(super, dev);
+			}
+			super->updates_pending++;
+			break;
+		}
+		if (is_initializing(dev)) {
+			dprintf_cont("while initialization.");
+			map->map_state = map_state;
+			super->updates_pending++;
+			break;
+		}
+	break;
+	case IMSM_T_STATE_FAILED: /* transition to failed state */
+		dprintf_cont("failed: ");
+		if (is_gen_migration(dev)) {
+			dprintf_cont("while general migration");
+			map->map_state = map_state;
+			super->updates_pending++;
+			break;
+		}
+		if (map->map_state != map_state) {
+			dprintf_cont("mark failed");
+			end_migration(dev, super, map_state);
+			super->updates_pending++;
+			a->last_checkpoint = 0;
+			break;
+		}
+	break;
+	default:
+		dprintf_cont("state %i\n", map_state);
+	}
+	dprintf_cont("\n");
+}
+
+static int store_imsm_mpb(int fd, struct imsm_super *mpb)
+{
+	void *buf = mpb;
+	__u32 mpb_size = __le32_to_cpu(mpb->mpb_size);
+	unsigned long long dsize;
+	unsigned long long sectors;
+	unsigned int sector_size;
+
+	if (!get_dev_sector_size(fd, NULL, &sector_size))
+		return 1;
+	get_dev_size(fd, NULL, &dsize);
+
+	if (mpb_size > sector_size) {
+		/* -1 to account for anchor */
+		sectors = mpb_sectors(mpb, sector_size) - 1;
+
+		/* write the extended mpb to the sectors preceeding the anchor */
+		if (lseek64(fd, dsize - (sector_size * (2 + sectors)),
+		   SEEK_SET) < 0)
+			return 1;
+
+		if ((unsigned long long)write(fd, buf + sector_size,
+		   sector_size * sectors) != sector_size * sectors)
+			return 1;
+	}
+
+	/* first block is stored on second to last sector of the disk */
+	if (lseek64(fd, dsize - (sector_size * 2), SEEK_SET) < 0)
+		return 1;
+
+	if ((unsigned int)write(fd, buf, sector_size) != sector_size)
+		return 1;
+
+	return 0;
+}
+
+static void imsm_sync_metadata(struct supertype *container)
+{
+	struct intel_super *super = container->sb;
+
+	dprintf("sync metadata: %d\n", super->updates_pending);
+	if (!super->updates_pending)
+		return;
+
+	write_super_imsm(container, 0);
+
+	super->updates_pending = 0;
+}
+
+static struct dl *imsm_readd(struct intel_super *super, int idx, struct active_array *a)
+{
+	struct imsm_dev *dev = get_imsm_dev(super, a->info.container_member);
+	int i = get_imsm_disk_idx(dev, idx, MAP_X);
+	struct dl *dl;
+
+	for (dl = super->disks; dl; dl = dl->next)
+		if (dl->index == i)
+			break;
+
+	if (dl && is_failed(&dl->disk))
+		dl = NULL;
+
+	if (dl)
+		dprintf("found %x:%x\n", dl->major, dl->minor);
+
+	return dl;
+}
+
+static struct dl *imsm_add_spare(struct intel_super *super, int slot,
+				 struct active_array *a, int activate_new,
+				 struct mdinfo *additional_test_list)
+{
+	struct imsm_dev *dev = get_imsm_dev(super, a->info.container_member);
+	int idx = get_imsm_disk_idx(dev, slot, MAP_X);
+	struct imsm_super *mpb = super->anchor;
+	struct imsm_map *map;
+	unsigned long long pos;
+	struct mdinfo *d;
+	struct extent *ex;
+	int i, j;
+	int found;
+	__u32 array_start = 0;
+	__u32 array_end = 0;
+	struct dl *dl;
+	struct mdinfo *test_list;
+
+	for (dl = super->disks; dl; dl = dl->next) {
+		/* If in this array, skip */
+		for (d = a->info.devs ; d ; d = d->next)
+			if (is_fd_valid(d->state_fd) &&
+			    d->disk.major == dl->major &&
+			    d->disk.minor == dl->minor) {
+				dprintf("%x:%x already in array\n",
+					dl->major, dl->minor);
+				break;
+			}
+		if (d)
+			continue;
+		test_list = additional_test_list;
+		while (test_list) {
+			if (test_list->disk.major == dl->major &&
+			    test_list->disk.minor == dl->minor) {
+				dprintf("%x:%x already in additional test list\n",
+					dl->major, dl->minor);
+				break;
+			}
+			test_list = test_list->next;
+		}
+		if (test_list)
+			continue;
+
+		/* skip in use or failed drives */
+		if (is_failed(&dl->disk) || idx == dl->index ||
+		    dl->index == -2) {
+			dprintf("%x:%x status (failed: %d index: %d)\n",
+				dl->major, dl->minor, is_failed(&dl->disk), idx);
+			continue;
+		}
+
+		/* skip pure spares when we are looking for partially
+		 * assimilated drives
+		 */
+		if (dl->index == -1 && !activate_new)
+			continue;
+
+		if (!drive_validate_sector_size(super, dl))
+			continue;
+
+		/* Does this unused device have the requisite free space?
+		 * It needs to be able to cover all member volumes
+		 */
+		ex = get_extents(super, dl, 1);
+		if (!ex) {
+			dprintf("cannot get extents\n");
+			continue;
+		}
+		for (i = 0; i < mpb->num_raid_devs; i++) {
+			dev = get_imsm_dev(super, i);
+			map = get_imsm_map(dev, MAP_0);
+
+			/* check if this disk is already a member of
+			 * this array
+			 */
+			if (get_imsm_disk_slot(map, dl->index) >= 0)
+				continue;
+
+			found = 0;
+			j = 0;
+			pos = 0;
+			array_start = pba_of_lba0(map);
+			array_end = array_start +
+				    per_dev_array_size(map) - 1;
+
+			do {
+				/* check that we can start at pba_of_lba0 with
+				 * num_data_stripes*blocks_per_stripe of space
+				 */
+				if (array_start >= pos && array_end < ex[j].start) {
+					found = 1;
+					break;
+				}
+				pos = ex[j].start + ex[j].size;
+				j++;
+			} while (ex[j-1].size);
+
+			if (!found)
+				break;
+		}
+
+		free(ex);
+		if (i < mpb->num_raid_devs) {
+			dprintf("%x:%x does not have %u to %u available\n",
+				dl->major, dl->minor, array_start, array_end);
+			/* No room */
+			continue;
+		}
+		return dl;
+	}
+
+	return dl;
+}
+
+static int imsm_rebuild_allowed(struct supertype *cont, int dev_idx, int failed)
+{
+	struct imsm_dev *dev2;
+	struct imsm_map *map;
+	struct dl *idisk;
+	int slot;
+	int idx;
+	__u8 state;
+
+	dev2 = get_imsm_dev(cont->sb, dev_idx);
+	if (dev2) {
+		state = imsm_check_degraded(cont->sb, dev2, failed, MAP_0);
+		if (state == IMSM_T_STATE_FAILED) {
+			map = get_imsm_map(dev2, MAP_0);
+			if (!map)
+				return 1;
+			for (slot = 0; slot < map->num_members; slot++) {
+				/*
+				 * Check if failed disks are deleted from intel
+				 * disk list or are marked to be deleted
+				 */
+				idx = get_imsm_disk_idx(dev2, slot, MAP_X);
+				idisk = get_imsm_dl_disk(cont->sb, idx);
+				/*
+				 * Do not rebuild the array if failed disks
+				 * from failed sub-array are not removed from
+				 * container.
+				 */
+				if (idisk &&
+				    is_failed(&idisk->disk) &&
+				    (idisk->action != DISK_REMOVE))
+					return 0;
+			}
+		}
+	}
+	return 1;
+}
+
+static struct mdinfo *imsm_activate_spare(struct active_array *a,
+					  struct metadata_update **updates)
+{
+	/**
+	 * Find a device with unused free space and use it to replace a
+	 * failed/vacant region in an array.  We replace failed regions one a
+	 * array at a time.  The result is that a new spare disk will be added
+	 * to the first failed array and after the monitor has finished
+	 * propagating failures the remainder will be consumed.
+	 *
+	 * FIXME add a capability for mdmon to request spares from another
+	 * container.
+	 */
+
+	struct intel_super *super = a->container->sb;
+	int inst = a->info.container_member;
+	struct imsm_dev *dev = get_imsm_dev(super, inst);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	int failed = a->info.array.raid_disks;
+	struct mdinfo *rv = NULL;
+	struct mdinfo *d;
+	struct mdinfo *di;
+	struct metadata_update *mu;
+	struct dl *dl;
+	struct imsm_update_activate_spare *u;
+	int num_spares = 0;
+	int i;
+	int allowed;
+
+	for (d = a->info.devs ; d; d = d->next) {
+		if (!is_fd_valid(d->state_fd))
+			continue;
+
+		if (d->curr_state & DS_FAULTY)
+			/* wait for Removal to happen */
+			return NULL;
+
+		failed--;
+	}
+
+	dprintf("imsm: activate spare: inst=%d failed=%d (%d) level=%d\n",
+		inst, failed, a->info.array.raid_disks, a->info.array.level);
+
+	if (imsm_reshape_blocks_arrays_changes(super))
+			return NULL;
+
+	/* Cannot activate another spare if rebuild is in progress already
+	 */
+	if (is_rebuilding(dev)) {
+		dprintf("imsm: No spare activation allowed. Rebuild in progress already.\n");
+		return NULL;
+	}
+
+	if (a->info.array.level == 4)
+		/* No repair for takeovered array
+		 * imsm doesn't support raid4
+		 */
+		return NULL;
+
+	if (imsm_check_degraded(super, dev, failed, MAP_0) !=
+			IMSM_T_STATE_DEGRADED)
+		return NULL;
+
+	if (get_imsm_map(dev, MAP_0)->map_state == IMSM_T_STATE_UNINITIALIZED) {
+		dprintf("imsm: No spare activation allowed. Volume is not initialized.\n");
+		return NULL;
+	}
+
+	/*
+	 * If there are any failed disks check state of the other volume.
+	 * Block rebuild if the another one is failed until failed disks
+	 * are removed from container.
+	 */
+	if (failed) {
+		dprintf("found failed disks in %.*s, check if there anotherfailed sub-array.\n",
+			MAX_RAID_SERIAL_LEN, dev->volume);
+		/* check if states of the other volumes allow for rebuild */
+		for (i = 0; i <  super->anchor->num_raid_devs; i++) {
+			if (i != inst) {
+				allowed = imsm_rebuild_allowed(a->container,
+							       i, failed);
+				if (!allowed)
+					return NULL;
+			}
+		}
+	}
+
+	/* For each slot, if it is not working, find a spare */
+	for (i = 0; i < a->info.array.raid_disks; i++) {
+		for (d = a->info.devs ; d ; d = d->next)
+			if (d->disk.raid_disk == i)
+				break;
+		dprintf("found %d: %p %x\n", i, d, d?d->curr_state:0);
+		if (d && is_fd_valid(d->state_fd))
+			continue;
+
+		/*
+		 * OK, this device needs recovery.  Try to re-add the
+		 * previous occupant of this slot, if this fails see if
+		 * we can continue the assimilation of a spare that was
+		 * partially assimilated, finally try to activate a new
+		 * spare.
+		 */
+		dl = imsm_readd(super, i, a);
+		if (!dl)
+			dl = imsm_add_spare(super, i, a, 0, rv);
+		if (!dl)
+			dl = imsm_add_spare(super, i, a, 1, rv);
+		if (!dl)
+			continue;
+
+		/* found a usable disk with enough space */
+		di = xcalloc(1, sizeof(*di));
+
+		/* dl->index will be -1 in the case we are activating a
+		 * pristine spare.  imsm_process_update() will create a
+		 * new index in this case.  Once a disk is found to be
+		 * failed in all member arrays it is kicked from the
+		 * metadata
+		 */
+		di->disk.number = dl->index;
+
+		/* (ab)use di->devs to store a pointer to the device
+		 * we chose
+		 */
+		di->devs = (struct mdinfo *) dl;
+
+		di->disk.raid_disk = i;
+		di->disk.major = dl->major;
+		di->disk.minor = dl->minor;
+		di->disk.state = 0;
+		di->recovery_start = 0;
+		di->data_offset = pba_of_lba0(map);
+		di->component_size = a->info.component_size;
+		di->container_member = inst;
+		di->bb.supported = 1;
+		if (a->info.consistency_policy == CONSISTENCY_POLICY_PPL) {
+			di->ppl_sector = get_ppl_sector(super, inst);
+			di->ppl_size = MULTIPLE_PPL_AREA_SIZE_IMSM >> 9;
+		}
+		super->random = random32();
+		di->next = rv;
+		rv = di;
+		num_spares++;
+		dprintf("%x:%x to be %d at %llu\n", dl->major, dl->minor,
+			i, di->data_offset);
+	}
+
+	if (!rv)
+		/* No spares found */
+		return rv;
+	/* Now 'rv' has a list of devices to return.
+	 * Create a metadata_update record to update the
+	 * disk_ord_tbl for the array
+	 */
+	mu = xmalloc(sizeof(*mu));
+	mu->buf = xcalloc(num_spares,
+			  sizeof(struct imsm_update_activate_spare));
+	mu->space = NULL;
+	mu->space_list = NULL;
+	mu->len = sizeof(struct imsm_update_activate_spare) * num_spares;
+	mu->next = *updates;
+	u = (struct imsm_update_activate_spare *) mu->buf;
+
+	for (di = rv ; di ; di = di->next) {
+		u->type = update_activate_spare;
+		u->dl = (struct dl *) di->devs;
+		di->devs = NULL;
+		u->slot = di->disk.raid_disk;
+		u->array = inst;
+		u->next = u + 1;
+		u++;
+	}
+	(u-1)->next = NULL;
+	*updates = mu;
+
+	return rv;
+}
+
+static int disks_overlap(struct intel_super *super, int idx, struct imsm_update_create_array *u)
+{
+	struct imsm_dev *dev = get_imsm_dev(super, idx);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	struct imsm_map *new_map = get_imsm_map(&u->dev, MAP_0);
+	struct disk_info *inf = get_disk_info(u);
+	struct imsm_disk *disk;
+	int i;
+	int j;
+
+	for (i = 0; i < map->num_members; i++) {
+		disk = get_imsm_disk(super, get_imsm_disk_idx(dev, i, MAP_X));
+		for (j = 0; j < new_map->num_members; j++)
+			if (serialcmp(disk->serial, inf[j].serial) == 0)
+				return 1;
+	}
+
+	return 0;
+}
+
+static struct dl *get_disk_super(struct intel_super *super, int major, int minor)
+{
+	struct dl *dl;
+
+	for (dl = super->disks; dl; dl = dl->next)
+		if (dl->major == major &&  dl->minor == minor)
+			return dl;
+	return NULL;
+}
+
+static int remove_disk_super(struct intel_super *super, int major, int minor)
+{
+	struct dl *prev;
+	struct dl *dl;
+
+	prev = NULL;
+	for (dl = super->disks; dl; dl = dl->next) {
+		if (dl->major == major && dl->minor == minor) {
+			/* remove */
+			if (prev)
+				prev->next = dl->next;
+			else
+				super->disks = dl->next;
+			dl->next = NULL;
+			__free_imsm_disk(dl, 1);
+			dprintf("removed %x:%x\n", major, minor);
+			break;
+		}
+		prev = dl;
+	}
+	return 0;
+}
+
+static void imsm_delete(struct intel_super *super, struct dl **dlp, unsigned index);
+
+static int add_remove_disk_update(struct intel_super *super)
+{
+	int check_degraded = 0;
+	struct dl *disk;
+
+	/* add/remove some spares to/from the metadata/contrainer */
+	while (super->disk_mgmt_list) {
+		struct dl *disk_cfg;
+
+		disk_cfg = super->disk_mgmt_list;
+		super->disk_mgmt_list = disk_cfg->next;
+		disk_cfg->next = NULL;
+
+		if (disk_cfg->action == DISK_ADD) {
+			disk_cfg->next = super->disks;
+			super->disks = disk_cfg;
+			check_degraded = 1;
+			dprintf("added %x:%x\n",
+				disk_cfg->major, disk_cfg->minor);
+		} else if (disk_cfg->action == DISK_REMOVE) {
+			dprintf("Disk remove action processed: %x.%x\n",
+				disk_cfg->major, disk_cfg->minor);
+			disk = get_disk_super(super,
+					      disk_cfg->major,
+					      disk_cfg->minor);
+			if (disk) {
+				/* store action status */
+				disk->action = DISK_REMOVE;
+				/* remove spare disks only */
+				if (disk->index == -1) {
+					remove_disk_super(super,
+							  disk_cfg->major,
+							  disk_cfg->minor);
+				} else {
+					disk_cfg->fd = disk->fd;
+					disk->fd = -1;
+				}
+			}
+			/* release allocate disk structure */
+			__free_imsm_disk(disk_cfg, 1);
+		}
+	}
+	return check_degraded;
+}
+
+static int apply_reshape_migration_update(struct imsm_update_reshape_migration *u,
+						struct intel_super *super,
+						void ***space_list)
+{
+	struct intel_dev *id;
+	void **tofree = NULL;
+	int ret_val = 0;
+
+	dprintf("(enter)\n");
+	if (u->subdev < 0 || u->subdev > 1) {
+		dprintf("imsm: Error: Wrong subdev: %i\n", u->subdev);
+		return ret_val;
+	}
+	if (space_list == NULL || *space_list == NULL) {
+		dprintf("imsm: Error: Memory is not allocated\n");
+		return ret_val;
+	}
+
+	for (id = super->devlist ; id; id = id->next) {
+		if (id->index == (unsigned)u->subdev) {
+			struct imsm_dev *dev = get_imsm_dev(super, u->subdev);
+			struct imsm_map *map;
+			struct imsm_dev *new_dev =
+				(struct imsm_dev *)*space_list;
+			struct imsm_map *migr_map = get_imsm_map(dev, MAP_1);
+			int to_state;
+			struct dl *new_disk;
+
+			if (new_dev == NULL)
+				return ret_val;
+			*space_list = **space_list;
+			memcpy(new_dev, dev, sizeof_imsm_dev(dev, 0));
+			map = get_imsm_map(new_dev, MAP_0);
+			if (migr_map) {
+				dprintf("imsm: Error: migration in progress");
+				return ret_val;
+			}
+
+			to_state = map->map_state;
+			if ((u->new_level == 5) && (map->raid_level == 0)) {
+				map->num_members++;
+				/* this should not happen */
+				if (u->new_disks[0] < 0) {
+					map->failed_disk_num =
+						map->num_members - 1;
+					to_state = IMSM_T_STATE_DEGRADED;
+				} else
+					to_state = IMSM_T_STATE_NORMAL;
+			}
+			migrate(new_dev, super, to_state, MIGR_GEN_MIGR);
+			if (u->new_level > -1)
+				map->raid_level = u->new_level;
+			migr_map = get_imsm_map(new_dev, MAP_1);
+			if ((u->new_level == 5) &&
+			    (migr_map->raid_level == 0)) {
+				int ord = map->num_members - 1;
+				migr_map->num_members--;
+				if (u->new_disks[0] < 0)
+					ord |= IMSM_ORD_REBUILD;
+				set_imsm_ord_tbl_ent(map,
+						     map->num_members - 1,
+						     ord);
+			}
+			id->dev = new_dev;
+			tofree = (void **)dev;
+
+			/* update chunk size
+			 */
+			if (u->new_chunksize > 0) {
+				struct imsm_map *dest_map =
+					get_imsm_map(dev, MAP_0);
+				int used_disks =
+					imsm_num_data_members(dest_map);
+
+				if (used_disks == 0)
+					return ret_val;
+
+				map->blocks_per_strip =
+					__cpu_to_le16(u->new_chunksize * 2);
+				update_num_data_stripes(map, imsm_dev_size(dev));
+			}
+
+			/* ensure blocks_per_member has valid value
+			 */
+			set_blocks_per_member(map,
+					      per_dev_array_size(map) +
+					      NUM_BLOCKS_DIRTY_STRIPE_REGION);
+
+			/* add disk
+			 */
+			if (u->new_level != 5 || migr_map->raid_level != 0 ||
+			    migr_map->raid_level == map->raid_level)
+				goto skip_disk_add;
+
+			if (u->new_disks[0] >= 0) {
+				/* use passes spare
+				 */
+				new_disk = get_disk_super(super,
+							major(u->new_disks[0]),
+							minor(u->new_disks[0]));
+				dprintf("imsm: new disk for reshape is: %i:%i (%p, index = %i)\n",
+					major(u->new_disks[0]),
+					minor(u->new_disks[0]),
+					new_disk, new_disk->index);
+				if (new_disk == NULL)
+					goto error_disk_add;
+
+				new_disk->index = map->num_members - 1;
+				/* slot to fill in autolayout
+				 */
+				new_disk->raiddisk = new_disk->index;
+				new_disk->disk.status |= CONFIGURED_DISK;
+				new_disk->disk.status &= ~SPARE_DISK;
+			} else
+				goto error_disk_add;
+
+skip_disk_add:
+			*tofree = *space_list;
+			/* calculate new size
+			 */
+			imsm_set_array_size(new_dev, -1);
+
+			ret_val = 1;
+		}
+	}
+
+	if (tofree)
+		*space_list = tofree;
+	return ret_val;
+
+error_disk_add:
+	dprintf("Error: imsm: Cannot find disk.\n");
+	return ret_val;
+}
+
+static int apply_size_change_update(struct imsm_update_size_change *u,
+		struct intel_super *super)
+{
+	struct intel_dev *id;
+	int ret_val = 0;
+
+	dprintf("(enter)\n");
+	if (u->subdev < 0 || u->subdev > 1) {
+		dprintf("imsm: Error: Wrong subdev: %i\n", u->subdev);
+		return ret_val;
+	}
+
+	for (id = super->devlist ; id; id = id->next) {
+		if (id->index == (unsigned)u->subdev) {
+			struct imsm_dev *dev = get_imsm_dev(super, u->subdev);
+			struct imsm_map *map = get_imsm_map(dev, MAP_0);
+			int used_disks = imsm_num_data_members(map);
+			unsigned long long blocks_per_member;
+			unsigned long long new_size_per_disk;
+
+			if (used_disks == 0)
+				return 0;
+
+			/* calculate new size
+			 */
+			new_size_per_disk = u->new_size / used_disks;
+			blocks_per_member = new_size_per_disk +
+					    NUM_BLOCKS_DIRTY_STRIPE_REGION;
+
+			imsm_set_array_size(dev, u->new_size);
+			set_blocks_per_member(map, blocks_per_member);
+			update_num_data_stripes(map, u->new_size);
+			ret_val = 1;
+			break;
+		}
+	}
+
+	return ret_val;
+}
+
+static int prepare_spare_to_activate(struct supertype *st,
+				     struct imsm_update_activate_spare *u)
+{
+	struct intel_super *super = st->sb;
+	int prev_current_vol = super->current_vol;
+	struct active_array *a;
+	int ret = 1;
+
+	for (a = st->arrays; a; a = a->next)
+		/*
+		 * Additional initialization (adding bitmap header, filling
+		 * the bitmap area with '1's to force initial rebuild for a whole
+		 * data-area) is required when adding the spare to the volume
+		 * with write-intent bitmap.
+		 */
+		if (a->info.container_member == u->array &&
+		    a->info.consistency_policy == CONSISTENCY_POLICY_BITMAP) {
+			struct dl *dl;
+
+			for (dl = super->disks; dl; dl = dl->next)
+				if (dl == u->dl)
+					break;
+			if (!dl)
+				break;
+
+			super->current_vol = u->array;
+			if (st->ss->write_bitmap(st, dl->fd, NoUpdate))
+				ret = 0;
+			super->current_vol = prev_current_vol;
+		}
+	return ret;
+}
+
+static int apply_update_activate_spare(struct imsm_update_activate_spare *u,
+				       struct intel_super *super,
+				       struct active_array *active_array)
+{
+	struct imsm_super *mpb = super->anchor;
+	struct imsm_dev *dev = get_imsm_dev(super, u->array);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	struct imsm_map *migr_map;
+	struct active_array *a;
+	struct imsm_disk *disk;
+	__u8 to_state;
+	struct dl *dl;
+	unsigned int found;
+	int failed;
+	int victim;
+	int i;
+	int second_map_created = 0;
+
+	for (; u; u = u->next) {
+		victim = get_imsm_disk_idx(dev, u->slot, MAP_X);
+
+		if (victim < 0)
+			return 0;
+
+		for (dl = super->disks; dl; dl = dl->next)
+			if (dl == u->dl)
+				break;
+
+		if (!dl) {
+			pr_err("error: imsm_activate_spare passed an unknown disk (index: %d)\n",
+				u->dl->index);
+			return 0;
+		}
+
+		/* count failures (excluding rebuilds and the victim)
+		 * to determine map[0] state
+		 */
+		failed = 0;
+		for (i = 0; i < map->num_members; i++) {
+			if (i == u->slot)
+				continue;
+			disk = get_imsm_disk(super,
+					     get_imsm_disk_idx(dev, i, MAP_X));
+			if (!disk || is_failed(disk))
+				failed++;
+		}
+
+		/* adding a pristine spare, assign a new index */
+		if (dl->index < 0) {
+			dl->index = super->anchor->num_disks;
+			super->anchor->num_disks++;
+		}
+		disk = &dl->disk;
+		disk->status |= CONFIGURED_DISK;
+		disk->status &= ~SPARE_DISK;
+
+		/* mark rebuild */
+		to_state = imsm_check_degraded(super, dev, failed, MAP_0);
+		if (!second_map_created) {
+			second_map_created = 1;
+			map->map_state = IMSM_T_STATE_DEGRADED;
+			migrate(dev, super, to_state, MIGR_REBUILD);
+		} else
+			map->map_state = to_state;
+		migr_map = get_imsm_map(dev, MAP_1);
+		set_imsm_ord_tbl_ent(map, u->slot, dl->index);
+		set_imsm_ord_tbl_ent(migr_map, u->slot,
+				     dl->index | IMSM_ORD_REBUILD);
+
+		/* update the family_num to mark a new container
+		 * generation, being careful to record the existing
+		 * family_num in orig_family_num to clean up after
+		 * earlier mdadm versions that neglected to set it.
+		 */
+		if (mpb->orig_family_num == 0)
+			mpb->orig_family_num = mpb->family_num;
+		mpb->family_num += super->random;
+
+		/* count arrays using the victim in the metadata */
+		found = 0;
+		for (a = active_array; a ; a = a->next) {
+			dev = get_imsm_dev(super, a->info.container_member);
+			map = get_imsm_map(dev, MAP_0);
+
+			if (get_imsm_disk_slot(map, victim) >= 0)
+				found++;
+		}
+
+		/* delete the victim if it is no longer being
+		 * utilized anywhere
+		 */
+		if (!found) {
+			struct dl **dlp;
+
+			/* We know that 'manager' isn't touching anything,
+			 * so it is safe to delete
+			 */
+			for (dlp = &super->disks; *dlp; dlp = &(*dlp)->next)
+				if ((*dlp)->index == victim)
+					break;
+
+			/* victim may be on the missing list */
+			if (!*dlp)
+				for (dlp = &super->missing; *dlp;
+				     dlp = &(*dlp)->next)
+					if ((*dlp)->index == victim)
+						break;
+			imsm_delete(super, dlp, victim);
+		}
+	}
+
+	return 1;
+}
+
+static int apply_reshape_container_disks_update(struct imsm_update_reshape *u,
+						struct intel_super *super,
+						void ***space_list)
+{
+	struct dl *new_disk;
+	struct intel_dev *id;
+	int i;
+	int delta_disks = u->new_raid_disks - u->old_raid_disks;
+	int disk_count = u->old_raid_disks;
+	void **tofree = NULL;
+	int devices_to_reshape = 1;
+	struct imsm_super *mpb = super->anchor;
+	int ret_val = 0;
+	unsigned int dev_id;
+
+	dprintf("(enter)\n");
+
+	/* enable spares to use in array */
+	for (i = 0; i < delta_disks; i++) {
+		new_disk = get_disk_super(super,
+					  major(u->new_disks[i]),
+					  minor(u->new_disks[i]));
+		dprintf("imsm: new disk for reshape is: %i:%i (%p, index = %i)\n",
+			major(u->new_disks[i]), minor(u->new_disks[i]),
+			new_disk, new_disk->index);
+		if (new_disk == NULL ||
+		    (new_disk->index >= 0 &&
+		     new_disk->index < u->old_raid_disks))
+			goto update_reshape_exit;
+		new_disk->index = disk_count++;
+		/* slot to fill in autolayout
+		 */
+		new_disk->raiddisk = new_disk->index;
+		new_disk->disk.status |=
+			CONFIGURED_DISK;
+		new_disk->disk.status &= ~SPARE_DISK;
+	}
+
+	dprintf("imsm: volume set mpb->num_raid_devs = %i\n",
+		mpb->num_raid_devs);
+	/* manage changes in volume
+	 */
+	for (dev_id = 0; dev_id < mpb->num_raid_devs; dev_id++) {
+		void **sp = *space_list;
+		struct imsm_dev *newdev;
+		struct imsm_map *newmap, *oldmap;
+
+		for (id = super->devlist ; id; id = id->next) {
+			if (id->index == dev_id)
+				break;
+		}
+		if (id == NULL)
+			break;
+		if (!sp)
+			continue;
+		*space_list = *sp;
+		newdev = (void*)sp;
+		/* Copy the dev, but not (all of) the map */
+		memcpy(newdev, id->dev, sizeof(*newdev));
+		oldmap = get_imsm_map(id->dev, MAP_0);
+		newmap = get_imsm_map(newdev, MAP_0);
+		/* Copy the current map */
+		memcpy(newmap, oldmap, sizeof_imsm_map(oldmap));
+		/* update one device only
+		 */
+		if (devices_to_reshape) {
+			dprintf("imsm: modifying subdev: %i\n",
+				id->index);
+			devices_to_reshape--;
+			newdev->vol.migr_state = 1;
+			set_vol_curr_migr_unit(newdev, 0);
+			set_migr_type(newdev, MIGR_GEN_MIGR);
+			newmap->num_members = u->new_raid_disks;
+			for (i = 0; i < delta_disks; i++) {
+				set_imsm_ord_tbl_ent(newmap,
+						     u->old_raid_disks + i,
+						     u->old_raid_disks + i);
+			}
+			/* New map is correct, now need to save old map
+			 */
+			newmap = get_imsm_map(newdev, MAP_1);
+			memcpy(newmap, oldmap, sizeof_imsm_map(oldmap));
+
+			imsm_set_array_size(newdev, -1);
+		}
+
+		sp = (void **)id->dev;
+		id->dev = newdev;
+		*sp = tofree;
+		tofree = sp;
+
+		/* Clear migration record */
+		memset(super->migr_rec, 0, sizeof(struct migr_record));
+	}
+	if (tofree)
+		*space_list = tofree;
+	ret_val = 1;
+
+update_reshape_exit:
+
+	return ret_val;
+}
+
+static int apply_takeover_update(struct imsm_update_takeover *u,
+				 struct intel_super *super,
+				 void ***space_list)
+{
+	struct imsm_dev *dev = NULL;
+	struct intel_dev *dv;
+	struct imsm_dev *dev_new;
+	struct imsm_map *map;
+	struct dl *dm, *du;
+	int i;
+
+	for (dv = super->devlist; dv; dv = dv->next)
+		if (dv->index == (unsigned int)u->subarray) {
+			dev = dv->dev;
+			break;
+		}
+
+	if (dev == NULL)
+		return 0;
+
+	map = get_imsm_map(dev, MAP_0);
+
+	if (u->direction == R10_TO_R0) {
+		/* Number of failed disks must be half of initial disk number */
+		if (imsm_count_failed(super, dev, MAP_0) !=
+				(map->num_members / 2))
+			return 0;
+
+		/* iterate through devices to mark removed disks as spare */
+		for (dm = super->disks; dm; dm = dm->next) {
+			if (dm->disk.status & FAILED_DISK) {
+				int idx = dm->index;
+				/* update indexes on the disk list */
+/* FIXME this loop-with-the-loop looks wrong,  I'm not convinced
+   the index values will end up being correct.... NB */
+				for (du = super->disks; du; du = du->next)
+					if (du->index > idx)
+						du->index--;
+				/* mark as spare disk */
+				mark_spare(dm);
+			}
+		}
+		/* update map */
+		map->num_members /= map->num_domains;
+		map->map_state = IMSM_T_STATE_NORMAL;
+		map->raid_level = 0;
+		set_num_domains(map);
+		update_num_data_stripes(map, imsm_dev_size(dev));
+		map->failed_disk_num = -1;
+	}
+
+	if (u->direction == R0_TO_R10) {
+		void **space;
+
+		/* update slots in current disk list */
+		for (dm = super->disks; dm; dm = dm->next) {
+			if (dm->index >= 0)
+				dm->index *= 2;
+		}
+		/* create new *missing* disks */
+		for (i = 0; i < map->num_members; i++) {
+			space = *space_list;
+			if (!space)
+				continue;
+			*space_list = *space;
+			du = (void *)space;
+			memcpy(du, super->disks, sizeof(*du));
+			du->fd = -1;
+			du->minor = 0;
+			du->major = 0;
+			du->index = (i * 2) + 1;
+			sprintf((char *)du->disk.serial,
+				" MISSING_%d", du->index);
+			sprintf((char *)du->serial,
+				"MISSING_%d", du->index);
+			du->next = super->missing;
+			super->missing = du;
+		}
+		/* create new dev and map */
+		space = *space_list;
+		if (!space)
+			return 0;
+		*space_list = *space;
+		dev_new = (void *)space;
+		memcpy(dev_new, dev, sizeof(*dev));
+		/* update new map */
+		map = get_imsm_map(dev_new, MAP_0);
+
+		map->map_state = IMSM_T_STATE_DEGRADED;
+		map->raid_level = 1;
+		set_num_domains(map);
+		map->num_members = map->num_members * map->num_domains;
+		update_num_data_stripes(map, imsm_dev_size(dev));
+
+		/* replace dev<->dev_new */
+		dv->dev = dev_new;
+	}
+	/* update disk order table */
+	for (du = super->disks; du; du = du->next)
+		if (du->index >= 0)
+			set_imsm_ord_tbl_ent(map, du->index, du->index);
+	for (du = super->missing; du; du = du->next)
+		if (du->index >= 0) {
+			set_imsm_ord_tbl_ent(map, du->index, du->index);
+			mark_missing(super, dv->dev, &du->disk, du->index);
+		}
+
+	return 1;
+}
+
+static void imsm_process_update(struct supertype *st,
+			        struct metadata_update *update)
+{
+	/**
+	 * crack open the metadata_update envelope to find the update record
+	 * update can be one of:
+	 *    update_reshape_container_disks - all the arrays in the container
+	 *      are being reshaped to have more devices.  We need to mark
+	 *      the arrays for general migration and convert selected spares
+	 *      into active devices.
+	 *    update_activate_spare - a spare device has replaced a failed
+	 *      device in an array, update the disk_ord_tbl.  If this disk is
+	 *      present in all member arrays then also clear the SPARE_DISK
+	 *      flag
+	 *    update_create_array
+	 *    update_kill_array
+	 *    update_rename_array
+	 *    update_add_remove_disk
+	 */
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb;
+	enum imsm_update_type type = *(enum imsm_update_type *) update->buf;
+
+	/* update requires a larger buf but the allocation failed */
+	if (super->next_len && !super->next_buf) {
+		super->next_len = 0;
+		return;
+	}
+
+	if (super->next_buf) {
+		memcpy(super->next_buf, super->buf, super->len);
+		free(super->buf);
+		super->len = super->next_len;
+		super->buf = super->next_buf;
+
+		super->next_len = 0;
+		super->next_buf = NULL;
+	}
+
+	mpb = super->anchor;
+
+	switch (type) {
+	case update_general_migration_checkpoint: {
+		struct intel_dev *id;
+		struct imsm_update_general_migration_checkpoint *u =
+							(void *)update->buf;
+
+		dprintf("called for update_general_migration_checkpoint\n");
+
+		/* find device under general migration */
+		for (id = super->devlist ; id; id = id->next) {
+			if (is_gen_migration(id->dev)) {
+				set_vol_curr_migr_unit(id->dev,
+						   u->curr_migr_unit);
+				super->updates_pending++;
+			}
+		}
+		break;
+	}
+	case update_takeover: {
+		struct imsm_update_takeover *u = (void *)update->buf;
+		if (apply_takeover_update(u, super, &update->space_list)) {
+			imsm_update_version_info(super);
+			super->updates_pending++;
+		}
+		break;
+	}
+
+	case update_reshape_container_disks: {
+		struct imsm_update_reshape *u = (void *)update->buf;
+		if (apply_reshape_container_disks_update(
+			    u, super, &update->space_list))
+			super->updates_pending++;
+		break;
+	}
+	case update_reshape_migration: {
+		struct imsm_update_reshape_migration *u = (void *)update->buf;
+		if (apply_reshape_migration_update(
+			    u, super, &update->space_list))
+			super->updates_pending++;
+		break;
+	}
+	case update_size_change: {
+		struct imsm_update_size_change *u = (void *)update->buf;
+		if (apply_size_change_update(u, super))
+			super->updates_pending++;
+		break;
+	}
+	case update_activate_spare: {
+		struct imsm_update_activate_spare *u = (void *) update->buf;
+
+		if (prepare_spare_to_activate(st, u) &&
+		    apply_update_activate_spare(u, super, st->arrays))
+			super->updates_pending++;
+		break;
+	}
+	case update_create_array: {
+		/* someone wants to create a new array, we need to be aware of
+		 * a few races/collisions:
+		 * 1/ 'Create' called by two separate instances of mdadm
+		 * 2/ 'Create' versus 'activate_spare': mdadm has chosen
+		 *     devices that have since been assimilated via
+		 *     activate_spare.
+		 * In the event this update can not be carried out mdadm will
+		 * (FIX ME) notice that its update did not take hold.
+		 */
+		struct imsm_update_create_array *u = (void *) update->buf;
+		struct intel_dev *dv;
+		struct imsm_dev *dev;
+		struct imsm_map *map, *new_map;
+		unsigned long long start, end;
+		unsigned long long new_start, new_end;
+		int i;
+		struct disk_info *inf;
+		struct dl *dl;
+
+		/* handle racing creates: first come first serve */
+		if (u->dev_idx < mpb->num_raid_devs) {
+			dprintf("subarray %d already defined\n", u->dev_idx);
+			goto create_error;
+		}
+
+		/* check update is next in sequence */
+		if (u->dev_idx != mpb->num_raid_devs) {
+			dprintf("can not create array %d expected index %d\n",
+				u->dev_idx, mpb->num_raid_devs);
+			goto create_error;
+		}
+
+		new_map = get_imsm_map(&u->dev, MAP_0);
+		new_start = pba_of_lba0(new_map);
+		new_end = new_start + per_dev_array_size(new_map);
+		inf = get_disk_info(u);
+
+		/* handle activate_spare versus create race:
+		 * check to make sure that overlapping arrays do not include
+		 * overalpping disks
+		 */
+		for (i = 0; i < mpb->num_raid_devs; i++) {
+			dev = get_imsm_dev(super, i);
+			map = get_imsm_map(dev, MAP_0);
+			start = pba_of_lba0(map);
+			end = start + per_dev_array_size(map);
+			if ((new_start >= start && new_start <= end) ||
+			    (start >= new_start && start <= new_end))
+				/* overlap */;
+			else
+				continue;
+
+			if (disks_overlap(super, i, u)) {
+				dprintf("arrays overlap\n");
+				goto create_error;
+			}
+		}
+
+		/* check that prepare update was successful */
+		if (!update->space) {
+			dprintf("prepare update failed\n");
+			goto create_error;
+		}
+
+		/* check that all disks are still active before committing
+		 * changes.  FIXME: could we instead handle this by creating a
+		 * degraded array?  That's probably not what the user expects,
+		 * so better to drop this update on the floor.
+		 */
+		for (i = 0; i < new_map->num_members; i++) {
+			dl = serial_to_dl(inf[i].serial, super);
+			if (!dl) {
+				dprintf("disk disappeared\n");
+				goto create_error;
+			}
+		}
+
+		super->updates_pending++;
+
+		/* convert spares to members and fixup ord_tbl */
+		for (i = 0; i < new_map->num_members; i++) {
+			dl = serial_to_dl(inf[i].serial, super);
+			if (dl->index == -1) {
+				dl->index = mpb->num_disks;
+				mpb->num_disks++;
+				dl->disk.status |= CONFIGURED_DISK;
+				dl->disk.status &= ~SPARE_DISK;
+			}
+			set_imsm_ord_tbl_ent(new_map, i, dl->index);
+		}
+
+		dv = update->space;
+		dev = dv->dev;
+		update->space = NULL;
+		imsm_copy_dev(dev, &u->dev);
+		dv->index = u->dev_idx;
+		dv->next = super->devlist;
+		super->devlist = dv;
+		mpb->num_raid_devs++;
+
+		imsm_update_version_info(super);
+		break;
+ create_error:
+		/* mdmon knows how to release update->space, but not
+		 * ((struct intel_dev *) update->space)->dev
+		 */
+		if (update->space) {
+			dv = update->space;
+			free(dv->dev);
+		}
+		break;
+	}
+	case update_kill_array: {
+		struct imsm_update_kill_array *u = (void *) update->buf;
+		int victim = u->dev_idx;
+		struct active_array *a;
+		struct intel_dev **dp;
+		struct imsm_dev *dev;
+
+		/* sanity check that we are not affecting the uuid of
+		 * active arrays, or deleting an active array
+		 *
+		 * FIXME when immutable ids are available, but note that
+		 * we'll also need to fixup the invalidated/active
+		 * subarray indexes in mdstat
+		 */
+		for (a = st->arrays; a; a = a->next)
+			if (a->info.container_member >= victim)
+				break;
+		/* by definition if mdmon is running at least one array
+		 * is active in the container, so checking
+		 * mpb->num_raid_devs is just extra paranoia
+		 */
+		dev = get_imsm_dev(super, victim);
+		if (a || !dev || mpb->num_raid_devs == 1) {
+			dprintf("failed to delete subarray-%d\n", victim);
+			break;
+		}
+
+		for (dp = &super->devlist; *dp;)
+			if ((*dp)->index == (unsigned)super->current_vol) {
+				*dp = (*dp)->next;
+			} else {
+				if ((*dp)->index > (unsigned)victim)
+					(*dp)->index--;
+				dp = &(*dp)->next;
+			}
+		mpb->num_raid_devs--;
+		super->updates_pending++;
+		break;
+	}
+	case update_rename_array: {
+		struct imsm_update_rename_array *u = (void *) update->buf;
+		char name[MAX_RAID_SERIAL_LEN+1];
+		int target = u->dev_idx;
+		struct active_array *a;
+		struct imsm_dev *dev;
+
+		/* sanity check that we are not affecting the uuid of
+		 * an active array
+		 */
+		memset(name, 0, sizeof(name));
+		snprintf(name, MAX_RAID_SERIAL_LEN, "%s", (char *) u->name);
+		name[MAX_RAID_SERIAL_LEN] = '\0';
+		for (a = st->arrays; a; a = a->next)
+			if (a->info.container_member == target)
+				break;
+		dev = get_imsm_dev(super, u->dev_idx);
+		if (a || !dev || !check_name(super, name, 1)) {
+			dprintf("failed to rename subarray-%d\n", target);
+			break;
+		}
+
+		memcpy(dev->volume, name, MAX_RAID_SERIAL_LEN);
+		super->updates_pending++;
+		break;
+	}
+	case update_add_remove_disk: {
+		/* we may be able to repair some arrays if disks are
+		 * being added, check the status of add_remove_disk
+		 * if discs has been added.
+		 */
+		if (add_remove_disk_update(super)) {
+			struct active_array *a;
+
+			super->updates_pending++;
+			for (a = st->arrays; a; a = a->next)
+				a->check_degraded = 1;
+		}
+		break;
+	}
+	case update_prealloc_badblocks_mem:
+		break;
+	case update_rwh_policy: {
+		struct imsm_update_rwh_policy *u = (void *)update->buf;
+		int target = u->dev_idx;
+		struct imsm_dev *dev = get_imsm_dev(super, target);
+		if (!dev) {
+			dprintf("could not find subarray-%d\n", target);
+			break;
+		}
+
+		if (dev->rwh_policy != u->new_policy) {
+			dev->rwh_policy = u->new_policy;
+			super->updates_pending++;
+		}
+		break;
+	}
+	default:
+		pr_err("error: unsupported process update type:(type: %d)\n",	type);
+	}
+}
+
+static struct mdinfo *get_spares_for_grow(struct supertype *st);
+
+static int imsm_prepare_update(struct supertype *st,
+			       struct metadata_update *update)
+{
+	/**
+	 * Allocate space to hold new disk entries, raid-device entries or a new
+	 * mpb if necessary.  The manager synchronously waits for updates to
+	 * complete in the monitor, so new mpb buffers allocated here can be
+	 * integrated by the monitor thread without worrying about live pointers
+	 * in the manager thread.
+	 */
+	enum imsm_update_type type;
+	struct intel_super *super = st->sb;
+	unsigned int sector_size = super->sector_size;
+	struct imsm_super *mpb = super->anchor;
+	size_t buf_len;
+	size_t len = 0;
+
+	if (update->len < (int)sizeof(type))
+		return 0;
+
+	type = *(enum imsm_update_type *) update->buf;
+
+	switch (type) {
+	case update_general_migration_checkpoint:
+		if (update->len < (int)sizeof(struct imsm_update_general_migration_checkpoint))
+			return 0;
+		dprintf("called for update_general_migration_checkpoint\n");
+		break;
+	case update_takeover: {
+		struct imsm_update_takeover *u = (void *)update->buf;
+		if (update->len < (int)sizeof(*u))
+			return 0;
+		if (u->direction == R0_TO_R10) {
+			void **tail = (void **)&update->space_list;
+			struct imsm_dev *dev = get_imsm_dev(super, u->subarray);
+			struct imsm_map *map = get_imsm_map(dev, MAP_0);
+			int num_members = map->num_members;
+			void *space;
+			int size, i;
+			/* allocate memory for added disks */
+			for (i = 0; i < num_members; i++) {
+				size = sizeof(struct dl);
+				space = xmalloc(size);
+				*tail = space;
+				tail = space;
+				*tail = NULL;
+			}
+			/* allocate memory for new device */
+			size = sizeof_imsm_dev(super->devlist->dev, 0) +
+				(num_members * sizeof(__u32));
+			space = xmalloc(size);
+			*tail = space;
+			tail = space;
+			*tail = NULL;
+			len = disks_to_mpb_size(num_members * 2);
+		}
+
+		break;
+	}
+	case update_reshape_container_disks: {
+		/* Every raid device in the container is about to
+		 * gain some more devices, and we will enter a
+		 * reconfiguration.
+		 * So each 'imsm_map' will be bigger, and the imsm_vol
+		 * will now hold 2 of them.
+		 * Thus we need new 'struct imsm_dev' allocations sized
+		 * as sizeof_imsm_dev but with more devices in both maps.
+		 */
+		struct imsm_update_reshape *u = (void *)update->buf;
+		struct intel_dev *dl;
+		void **space_tail = (void**)&update->space_list;
+
+		if (update->len < (int)sizeof(*u))
+			return 0;
+
+		dprintf("for update_reshape\n");
+
+		for (dl = super->devlist; dl; dl = dl->next) {
+			int size = sizeof_imsm_dev(dl->dev, 1);
+			void *s;
+			if (u->new_raid_disks > u->old_raid_disks)
+				size += sizeof(__u32)*2*
+					(u->new_raid_disks - u->old_raid_disks);
+			s = xmalloc(size);
+			*space_tail = s;
+			space_tail = s;
+			*space_tail = NULL;
+		}
+
+		len = disks_to_mpb_size(u->new_raid_disks);
+		dprintf("New anchor length is %llu\n", (unsigned long long)len);
+		break;
+	}
+	case update_reshape_migration: {
+		/* for migration level 0->5 we need to add disks
+		 * so the same as for container operation we will copy
+		 * device to the bigger location.
+		 * in memory prepared device and new disk area are prepared
+		 * for usage in process update
+		 */
+		struct imsm_update_reshape_migration *u = (void *)update->buf;
+		struct intel_dev *id;
+		void **space_tail = (void **)&update->space_list;
+		int size;
+		void *s;
+		int current_level = -1;
+
+		if (update->len < (int)sizeof(*u))
+			return 0;
+
+		dprintf("for update_reshape\n");
+
+		/* add space for bigger array in update
+		 */
+		for (id = super->devlist; id; id = id->next) {
+			if (id->index == (unsigned)u->subdev) {
+				size = sizeof_imsm_dev(id->dev, 1);
+				if (u->new_raid_disks > u->old_raid_disks)
+					size += sizeof(__u32)*2*
+					(u->new_raid_disks - u->old_raid_disks);
+				s = xmalloc(size);
+				*space_tail = s;
+				space_tail = s;
+				*space_tail = NULL;
+				break;
+			}
+		}
+		if (update->space_list == NULL)
+			break;
+
+		/* add space for disk in update
+		 */
+		size = sizeof(struct dl);
+		s = xmalloc(size);
+		*space_tail = s;
+		space_tail = s;
+		*space_tail = NULL;
+
+		/* add spare device to update
+		 */
+		for (id = super->devlist ; id; id = id->next)
+			if (id->index == (unsigned)u->subdev) {
+				struct imsm_dev *dev;
+				struct imsm_map *map;
+
+				dev = get_imsm_dev(super, u->subdev);
+				map = get_imsm_map(dev, MAP_0);
+				current_level = map->raid_level;
+				break;
+			}
+		if (u->new_level == 5 && u->new_level != current_level) {
+			struct mdinfo *spares;
+
+			spares = get_spares_for_grow(st);
+			if (spares) {
+				struct dl *dl;
+				struct mdinfo *dev;
+
+				dev = spares->devs;
+				if (dev) {
+					u->new_disks[0] =
+						makedev(dev->disk.major,
+							dev->disk.minor);
+					dl = get_disk_super(super,
+							    dev->disk.major,
+							    dev->disk.minor);
+					dl->index = u->old_raid_disks;
+					dev = dev->next;
+				}
+				sysfs_free(spares);
+			}
+		}
+		len = disks_to_mpb_size(u->new_raid_disks);
+		dprintf("New anchor length is %llu\n", (unsigned long long)len);
+		break;
+	}
+	case update_size_change: {
+		if (update->len < (int)sizeof(struct imsm_update_size_change))
+			return 0;
+		break;
+	}
+	case update_activate_spare: {
+		if (update->len < (int)sizeof(struct imsm_update_activate_spare))
+			return 0;
+		break;
+	}
+	case update_create_array: {
+		struct imsm_update_create_array *u = (void *) update->buf;
+		struct intel_dev *dv;
+		struct imsm_dev *dev = &u->dev;
+		struct imsm_map *map = get_imsm_map(dev, MAP_0);
+		struct dl *dl;
+		struct disk_info *inf;
+		int i;
+		int activate = 0;
+
+		if (update->len < (int)sizeof(*u))
+			return 0;
+
+		inf = get_disk_info(u);
+		len = sizeof_imsm_dev(dev, 1);
+		/* allocate a new super->devlist entry */
+		dv = xmalloc(sizeof(*dv));
+		dv->dev = xmalloc(len);
+		update->space = dv;
+
+		/* count how many spares will be converted to members */
+		for (i = 0; i < map->num_members; i++) {
+			dl = serial_to_dl(inf[i].serial, super);
+			if (!dl) {
+				/* hmm maybe it failed?, nothing we can do about
+				 * it here
+				 */
+				continue;
+			}
+			if (count_memberships(dl, super) == 0)
+				activate++;
+		}
+		len += activate * sizeof(struct imsm_disk);
+		break;
+	}
+	case update_kill_array: {
+		if (update->len < (int)sizeof(struct imsm_update_kill_array))
+			return 0;
+		break;
+	}
+	case update_rename_array: {
+		if (update->len < (int)sizeof(struct imsm_update_rename_array))
+			return 0;
+		break;
+	}
+	case update_add_remove_disk:
+		/* no update->len needed */
+		break;
+	case update_prealloc_badblocks_mem:
+		super->extra_space += sizeof(struct bbm_log) -
+			get_imsm_bbm_log_size(super->bbm_log);
+		break;
+	case update_rwh_policy: {
+		if (update->len < (int)sizeof(struct imsm_update_rwh_policy))
+			return 0;
+		break;
+	}
+	default:
+		return 0;
+	}
+
+	/* check if we need a larger metadata buffer */
+	if (super->next_buf)
+		buf_len = super->next_len;
+	else
+		buf_len = super->len;
+
+	if (__le32_to_cpu(mpb->mpb_size) + super->extra_space + len > buf_len) {
+		/* ok we need a larger buf than what is currently allocated
+		 * if this allocation fails process_update will notice that
+		 * ->next_len is set and ->next_buf is NULL
+		 */
+		buf_len = ROUND_UP(__le32_to_cpu(mpb->mpb_size) +
+				   super->extra_space + len, sector_size);
+		if (super->next_buf)
+			free(super->next_buf);
+
+		super->next_len = buf_len;
+		if (posix_memalign(&super->next_buf, sector_size, buf_len) == 0)
+			memset(super->next_buf, 0, buf_len);
+		else
+			super->next_buf = NULL;
+	}
+	return 1;
+}
+
+/* must be called while manager is quiesced */
+static void imsm_delete(struct intel_super *super, struct dl **dlp, unsigned index)
+{
+	struct imsm_super *mpb = super->anchor;
+	struct dl *iter;
+	struct imsm_dev *dev;
+	struct imsm_map *map;
+	unsigned int i, j, num_members;
+	__u32 ord, ord_map0;
+	struct bbm_log *log = super->bbm_log;
+
+	dprintf("deleting device[%d] from imsm_super\n", index);
+
+	/* shift all indexes down one */
+	for (iter = super->disks; iter; iter = iter->next)
+		if (iter->index > (int)index)
+			iter->index--;
+	for (iter = super->missing; iter; iter = iter->next)
+		if (iter->index > (int)index)
+			iter->index--;
+
+	for (i = 0; i < mpb->num_raid_devs; i++) {
+		dev = get_imsm_dev(super, i);
+		map = get_imsm_map(dev, MAP_0);
+		num_members = map->num_members;
+		for (j = 0; j < num_members; j++) {
+			/* update ord entries being careful not to propagate
+			 * ord-flags to the first map
+			 */
+			ord = get_imsm_ord_tbl_ent(dev, j, MAP_X);
+			ord_map0 = get_imsm_ord_tbl_ent(dev, j, MAP_0);
+
+			if (ord_to_idx(ord) <= index)
+				continue;
+
+			map = get_imsm_map(dev, MAP_0);
+			set_imsm_ord_tbl_ent(map, j, ord_map0 - 1);
+			map = get_imsm_map(dev, MAP_1);
+			if (map)
+				set_imsm_ord_tbl_ent(map, j, ord - 1);
+		}
+	}
+
+	for (i = 0; i < log->entry_count; i++) {
+		struct bbm_log_entry *entry = &log->marked_block_entries[i];
+
+		if (entry->disk_ordinal <= index)
+			continue;
+		entry->disk_ordinal--;
+	}
+
+	mpb->num_disks--;
+	super->updates_pending++;
+	if (*dlp) {
+		struct dl *dl = *dlp;
+
+		*dlp = (*dlp)->next;
+		__free_imsm_disk(dl, 1);
+	}
+}
+
+static int imsm_get_allowed_degradation(int level, int raid_disks,
+					struct intel_super *super,
+					struct imsm_dev *dev)
+{
+	switch (level) {
+	case 1:
+	case 10:{
+		int ret_val = 0;
+		struct imsm_map *map;
+		int i;
+
+		ret_val = raid_disks/2;
+		/* check map if all disks pairs not failed
+		 * in both maps
+		 */
+		map = get_imsm_map(dev, MAP_0);
+		for (i = 0; i < ret_val; i++) {
+			int degradation = 0;
+			if (get_imsm_disk(super, i) == NULL)
+				degradation++;
+			if (get_imsm_disk(super, i + 1) == NULL)
+				degradation++;
+			if (degradation == 2)
+				return 0;
+		}
+		map = get_imsm_map(dev, MAP_1);
+		/* if there is no second map
+		 * result can be returned
+		 */
+		if (map == NULL)
+			return ret_val;
+		/* check degradation in second map
+		 */
+		for (i = 0; i < ret_val; i++) {
+			int degradation = 0;
+		if (get_imsm_disk(super, i) == NULL)
+				degradation++;
+			if (get_imsm_disk(super, i + 1) == NULL)
+				degradation++;
+			if (degradation == 2)
+				return 0;
+		}
+		return ret_val;
+	}
+	case 5:
+		return 1;
+	case 6:
+		return 2;
+	default:
+		return 0;
+	}
+}
+
+/*******************************************************************************
+ * Function:	validate_container_imsm
+ * Description: This routine validates container after assemble,
+ *		eg. if devices in container are under the same controller.
+ *
+ * Parameters:
+ *	info	: linked list with info about devices used in array
+ * Returns:
+ *	1 : HBA mismatch
+ *	0 : Success
+ ******************************************************************************/
+int validate_container_imsm(struct mdinfo *info)
+{
+	if (check_env("IMSM_NO_PLATFORM"))
+		return 0;
+
+	struct sys_dev *idev;
+	struct sys_dev *hba = NULL;
+	struct sys_dev *intel_devices = find_intel_devices();
+	char *dev_path = devt_to_devpath(makedev(info->disk.major,
+						 info->disk.minor), 1, NULL);
+
+	for (idev = intel_devices; idev; idev = idev->next) {
+		if (dev_path && strstr(dev_path, idev->path)) {
+			hba = idev;
+			break;
+		}
+	}
+	if (dev_path)
+		free(dev_path);
+
+	if (!hba) {
+		pr_err("WARNING - Cannot detect HBA for device %s!\n",
+				devid2kname(makedev(info->disk.major, info->disk.minor)));
+		return 1;
+	}
+
+	const struct imsm_orom *orom = get_orom_by_device_id(hba->dev_id);
+	struct mdinfo *dev;
+
+	for (dev = info->next; dev; dev = dev->next) {
+		dev_path = devt_to_devpath(makedev(dev->disk.major,
+						   dev->disk.minor), 1, NULL);
+
+		struct sys_dev *hba2 = NULL;
+		for (idev = intel_devices; idev; idev = idev->next) {
+			if (dev_path && strstr(dev_path, idev->path)) {
+				hba2 = idev;
+				break;
+			}
+		}
+		if (dev_path)
+			free(dev_path);
+
+		const struct imsm_orom *orom2 = hba2 == NULL ? NULL :
+				get_orom_by_device_id(hba2->dev_id);
+
+		if (hba2 && hba->type != hba2->type) {
+			pr_err("WARNING - HBAs of devices do not match %s != %s\n",
+				get_sys_dev_type(hba->type), get_sys_dev_type(hba2->type));
+			return 1;
+		}
+
+		if (orom != orom2) {
+			pr_err("WARNING - IMSM container assembled with disks under different HBAs!\n"
+				"       This operation is not supported and can lead to data loss.\n");
+			return 1;
+		}
+
+		if (!orom) {
+			pr_err("WARNING - IMSM container assembled with disks under HBAs without IMSM platform support!\n"
+				"       This operation is not supported and can lead to data loss.\n");
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+* Function:   imsm_record_badblock
+* Description: This routine stores new bad block record in BBM log
+*
+* Parameters:
+*     a		: array containing a bad block
+*     slot	: disk number containing a bad block
+*     sector	: bad block sector
+*     length	: bad block sectors range
+* Returns:
+*     1 : Success
+*     0 : Error
+******************************************************************************/
+static int imsm_record_badblock(struct active_array *a, int slot,
+			  unsigned long long sector, int length)
+{
+	struct intel_super *super = a->container->sb;
+	int ord;
+	int ret;
+
+	ord = imsm_disk_slot_to_ord(a, slot);
+	if (ord < 0)
+		return 0;
+
+	ret = record_new_badblock(super->bbm_log, ord_to_idx(ord), sector,
+				   length);
+	if (ret)
+		super->updates_pending++;
+
+	return ret;
+}
+/*******************************************************************************
+* Function:   imsm_clear_badblock
+* Description: This routine clears bad block record from BBM log
+*
+* Parameters:
+*     a		: array containing a bad block
+*     slot	: disk number containing a bad block
+*     sector	: bad block sector
+*     length	: bad block sectors range
+* Returns:
+*     1 : Success
+*     0 : Error
+******************************************************************************/
+static int imsm_clear_badblock(struct active_array *a, int slot,
+			unsigned long long sector, int length)
+{
+	struct intel_super *super = a->container->sb;
+	int ord;
+	int ret;
+
+	ord = imsm_disk_slot_to_ord(a, slot);
+	if (ord < 0)
+		return 0;
+
+	ret = clear_badblock(super->bbm_log, ord_to_idx(ord), sector, length);
+	if (ret)
+		super->updates_pending++;
+
+	return ret;
+}
+/*******************************************************************************
+* Function:   imsm_get_badblocks
+* Description: This routine get list of bad blocks for an array
+*
+* Parameters:
+*     a		: array
+*     slot	: disk number
+* Returns:
+*     bb	: structure containing bad blocks
+*     NULL	: error
+******************************************************************************/
+static struct md_bb *imsm_get_badblocks(struct active_array *a, int slot)
+{
+	int inst = a->info.container_member;
+	struct intel_super *super = a->container->sb;
+	struct imsm_dev *dev = get_imsm_dev(super, inst);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+	int ord;
+
+	ord = imsm_disk_slot_to_ord(a, slot);
+	if (ord < 0)
+		return NULL;
+
+	get_volume_badblocks(super->bbm_log, ord_to_idx(ord), pba_of_lba0(map),
+			     per_dev_array_size(map), &super->bb);
+
+	return &super->bb;
+}
+/*******************************************************************************
+* Function:   examine_badblocks_imsm
+* Description: Prints list of bad blocks on a disk to the standard output
+*
+* Parameters:
+*     st	: metadata handler
+*     fd	: open file descriptor for device
+*     devname	: device name
+* Returns:
+*     0 : Success
+*     1 : Error
+******************************************************************************/
+static int examine_badblocks_imsm(struct supertype *st, int fd, char *devname)
+{
+	struct intel_super *super = st->sb;
+	struct bbm_log *log = super->bbm_log;
+	struct dl *d = NULL;
+	int any = 0;
+
+	for (d = super->disks; d ; d = d->next) {
+		if (strcmp(d->devname, devname) == 0)
+			break;
+	}
+
+	if ((d == NULL) || (d->index < 0)) { /* serial mismatch probably */
+		pr_err("%s doesn't appear to be part of a raid array\n",
+		       devname);
+		return 1;
+	}
+
+	if (log != NULL) {
+		unsigned int i;
+		struct bbm_log_entry *entry = &log->marked_block_entries[0];
+
+		for (i = 0; i < log->entry_count; i++) {
+			if (entry[i].disk_ordinal == d->index) {
+				unsigned long long sector = __le48_to_cpu(
+					&entry[i].defective_block_start);
+				int cnt = entry[i].marked_count + 1;
+
+				if (!any) {
+					printf("Bad-blocks on %s:\n", devname);
+					any = 1;
+				}
+
+				printf("%20llu for %d sectors\n", sector, cnt);
+			}
+		}
+	}
+
+	if (!any)
+		printf("No bad-blocks list configured on %s\n", devname);
+
+	return 0;
+}
+/*******************************************************************************
+ * Function:	init_migr_record_imsm
+ * Description:	Function inits imsm migration record
+ * Parameters:
+ *	super	: imsm internal array info
+ *	dev	: device under migration
+ *	info	: general array info to find the smallest device
+ * Returns:
+ *	none
+ ******************************************************************************/
+void init_migr_record_imsm(struct supertype *st, struct imsm_dev *dev,
+			   struct mdinfo *info)
+{
+	struct intel_super *super = st->sb;
+	struct migr_record *migr_rec = super->migr_rec;
+	int new_data_disks;
+	unsigned long long dsize, dev_sectors;
+	long long unsigned min_dev_sectors = -1LLU;
+	struct imsm_map *map_dest = get_imsm_map(dev, MAP_0);
+	struct imsm_map *map_src = get_imsm_map(dev, MAP_1);
+	unsigned long long num_migr_units;
+	unsigned long long array_blocks;
+	struct dl *dl_disk = NULL;
+
+	memset(migr_rec, 0, sizeof(struct migr_record));
+	migr_rec->family_num = __cpu_to_le32(super->anchor->family_num);
+
+	/* only ascending reshape supported now */
+	migr_rec->ascending_migr = __cpu_to_le32(1);
+
+	migr_rec->dest_depth_per_unit = GEN_MIGR_AREA_SIZE /
+		max(map_dest->blocks_per_strip, map_src->blocks_per_strip);
+	migr_rec->dest_depth_per_unit *=
+		max(map_dest->blocks_per_strip, map_src->blocks_per_strip);
+	new_data_disks = imsm_num_data_members(map_dest);
+	migr_rec->blocks_per_unit =
+		__cpu_to_le32(migr_rec->dest_depth_per_unit * new_data_disks);
+	migr_rec->dest_depth_per_unit =
+		__cpu_to_le32(migr_rec->dest_depth_per_unit);
+	array_blocks = info->component_size * new_data_disks;
+	num_migr_units =
+		array_blocks / __le32_to_cpu(migr_rec->blocks_per_unit);
+
+	if (array_blocks % __le32_to_cpu(migr_rec->blocks_per_unit))
+		num_migr_units++;
+	set_num_migr_units(migr_rec, num_migr_units);
+
+	migr_rec->post_migr_vol_cap =  dev->size_low;
+	migr_rec->post_migr_vol_cap_hi = dev->size_high;
+
+	/* Find the smallest dev */
+	for (dl_disk =  super->disks; dl_disk ; dl_disk = dl_disk->next) {
+		/* ignore spares in container */
+		if (dl_disk->index < 0)
+			continue;
+		get_dev_size(dl_disk->fd, NULL, &dsize);
+		dev_sectors = dsize / 512;
+		if (dev_sectors < min_dev_sectors)
+			min_dev_sectors = dev_sectors;
+	}
+	set_migr_chkp_area_pba(migr_rec, min_dev_sectors -
+					RAID_DISK_RESERVED_BLOCKS_IMSM_HI);
+
+	write_imsm_migr_rec(st);
+
+	return;
+}
+
+/*******************************************************************************
+ * Function:	save_backup_imsm
+ * Description:	Function saves critical data stripes to Migration Copy Area
+ *		and updates the current migration unit status.
+ *		Use restore_stripes() to form a destination stripe,
+ *		and to write it to the Copy Area.
+ * Parameters:
+ *	st		: supertype information
+ *	dev		: imsm device that backup is saved for
+ *	info		: general array info
+ *	buf		: input buffer
+ *	length		: length of data to backup (blocks_per_unit)
+ * Returns:
+ *	 0 : success
+ *,	-1 : fail
+ ******************************************************************************/
+int save_backup_imsm(struct supertype *st,
+		     struct imsm_dev *dev,
+		     struct mdinfo *info,
+		     void *buf,
+		     int length)
+{
+	int rv = -1;
+	struct intel_super *super = st->sb;
+	int i;
+	struct imsm_map *map_dest = get_imsm_map(dev, MAP_0);
+	int new_disks = map_dest->num_members;
+	int dest_layout = 0;
+	int dest_chunk, targets[new_disks];
+	unsigned long long start, target_offsets[new_disks];
+	int data_disks = imsm_num_data_members(map_dest);
+
+	for (i = 0; i < new_disks; i++) {
+		struct dl *dl_disk = get_imsm_dl_disk(super, i);
+		if (dl_disk && is_fd_valid(dl_disk->fd))
+			targets[i] = dl_disk->fd;
+		else
+			goto abort;
+	}
+
+	start = info->reshape_progress * 512;
+	for (i = 0; i < new_disks; i++) {
+		target_offsets[i] = migr_chkp_area_pba(super->migr_rec) * 512;
+		/* move back copy area adderss, it will be moved forward
+		 * in restore_stripes() using start input variable
+		 */
+		target_offsets[i] -= start/data_disks;
+	}
+
+	dest_layout = imsm_level_to_layout(map_dest->raid_level);
+	dest_chunk = __le16_to_cpu(map_dest->blocks_per_strip) * 512;
+
+	if (restore_stripes(targets, /* list of dest devices */
+			    target_offsets, /* migration record offsets */
+			    new_disks,
+			    dest_chunk,
+			    map_dest->raid_level,
+			    dest_layout,
+			    -1,    /* source backup file descriptor */
+			    0,     /* input buf offset
+				    * always 0 buf is already offseted */
+			    start,
+			    length,
+			    buf) != 0) {
+		pr_err("Error restoring stripes\n");
+		goto abort;
+	}
+
+	rv = 0;
+
+abort:
+	return rv;
+}
+
+/*******************************************************************************
+ * Function:	save_checkpoint_imsm
+ * Description:	Function called for current unit status update
+ *		in the migration record. It writes it to disk.
+ * Parameters:
+ *	super	: imsm internal array info
+ *	info	: general array info
+ * Returns:
+ *	0: success
+ *	1: failure
+ *	2: failure, means no valid migration record
+ *		   / no general migration in progress /
+ ******************************************************************************/
+int save_checkpoint_imsm(struct supertype *st, struct mdinfo *info, int state)
+{
+	struct intel_super *super = st->sb;
+	unsigned long long blocks_per_unit;
+	unsigned long long curr_migr_unit;
+
+	if (load_imsm_migr_rec(super) != 0) {
+		dprintf("imsm: ERROR: Cannot read migration record for checkpoint save.\n");
+		return 1;
+	}
+
+	blocks_per_unit = __le32_to_cpu(super->migr_rec->blocks_per_unit);
+	if (blocks_per_unit == 0) {
+		dprintf("imsm: no migration in progress.\n");
+		return 2;
+	}
+	curr_migr_unit = info->reshape_progress / blocks_per_unit;
+	/* check if array is alligned to copy area
+	 * if it is not alligned, add one to current migration unit value
+	 * this can happend on array reshape finish only
+	 */
+	if (info->reshape_progress % blocks_per_unit)
+		curr_migr_unit++;
+
+	set_current_migr_unit(super->migr_rec, curr_migr_unit);
+	super->migr_rec->rec_status = __cpu_to_le32(state);
+	set_migr_dest_1st_member_lba(super->migr_rec,
+			super->migr_rec->dest_depth_per_unit * curr_migr_unit);
+
+	if (write_imsm_migr_rec(st) < 0) {
+		dprintf("imsm: Cannot write migration record outside backup area\n");
+		return 1;
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	recover_backup_imsm
+ * Description:	Function recovers critical data from the Migration Copy Area
+ *		while assembling an array.
+ * Parameters:
+ *	super	: imsm internal array info
+ *	info	: general array info
+ * Returns:
+ *	0 : success (or there is no data to recover)
+ *	1 : fail
+ ******************************************************************************/
+int recover_backup_imsm(struct supertype *st, struct mdinfo *info)
+{
+	struct intel_super *super = st->sb;
+	struct migr_record *migr_rec = super->migr_rec;
+	struct imsm_map *map_dest;
+	struct intel_dev *id = NULL;
+	unsigned long long read_offset;
+	unsigned long long write_offset;
+	unsigned unit_len;
+	int new_disks, err;
+	char *buf = NULL;
+	int retval = 1;
+	unsigned int sector_size = super->sector_size;
+	unsigned long long curr_migr_unit = current_migr_unit(migr_rec);
+	unsigned long long num_migr_units = get_num_migr_units(migr_rec);
+	char buffer[20];
+	int skipped_disks = 0;
+	struct dl *dl_disk;
+
+	err = sysfs_get_str(info, NULL, "array_state", (char *)buffer, 20);
+	if (err < 1)
+		return 1;
+
+	/* recover data only during assemblation */
+	if (strncmp(buffer, "inactive", 8) != 0)
+		return 0;
+	/* no data to recover */
+	if (__le32_to_cpu(migr_rec->rec_status) == UNIT_SRC_NORMAL)
+		return 0;
+	if (curr_migr_unit >= num_migr_units)
+		return 1;
+
+	/* find device during reshape */
+	for (id = super->devlist; id; id = id->next)
+		if (is_gen_migration(id->dev))
+			break;
+	if (id == NULL)
+		return 1;
+
+	map_dest = get_imsm_map(id->dev, MAP_0);
+	new_disks = map_dest->num_members;
+
+	read_offset = migr_chkp_area_pba(migr_rec) * 512;
+
+	write_offset = (migr_dest_1st_member_lba(migr_rec) +
+			pba_of_lba0(map_dest)) * 512;
+
+	unit_len = __le32_to_cpu(migr_rec->dest_depth_per_unit) * 512;
+	if (posix_memalign((void **)&buf, sector_size, unit_len) != 0)
+		goto abort;
+
+	for (dl_disk = super->disks; dl_disk; dl_disk = dl_disk->next) {
+		if (dl_disk->index < 0)
+			continue;
+
+		if (!is_fd_valid(dl_disk->fd)) {
+			skipped_disks++;
+			continue;
+		}
+		if (lseek64(dl_disk->fd, read_offset, SEEK_SET) < 0) {
+			pr_err("Cannot seek to block: %s\n",
+			       strerror(errno));
+			skipped_disks++;
+			continue;
+		}
+		if (read(dl_disk->fd, buf, unit_len) != (ssize_t)unit_len) {
+			pr_err("Cannot read copy area block: %s\n",
+			       strerror(errno));
+			skipped_disks++;
+			continue;
+		}
+		if (lseek64(dl_disk->fd, write_offset, SEEK_SET) < 0) {
+			pr_err("Cannot seek to block: %s\n",
+			       strerror(errno));
+			skipped_disks++;
+			continue;
+		}
+		if (write(dl_disk->fd, buf, unit_len) != (ssize_t)unit_len) {
+			pr_err("Cannot restore block: %s\n",
+			       strerror(errno));
+			skipped_disks++;
+			continue;
+		}
+	}
+
+	if (skipped_disks > imsm_get_allowed_degradation(info->new_level,
+							 new_disks,
+							 super,
+							 id->dev)) {
+		pr_err("Cannot restore data from backup. Too many failed disks\n");
+		goto abort;
+	}
+
+	if (save_checkpoint_imsm(st, info, UNIT_SRC_NORMAL)) {
+		/* ignore error == 2, this can mean end of reshape here
+		 */
+		dprintf("imsm: Cannot write checkpoint to migration record (UNIT_SRC_NORMAL) during restart\n");
+	} else
+		retval = 0;
+
+abort:
+	free(buf);
+	return retval;
+}
+
+static char disk_by_path[] = "/dev/disk/by-path/";
+
+static const char *imsm_get_disk_controller_domain(const char *path)
+{
+	char disk_path[PATH_MAX];
+	char *drv=NULL;
+	struct stat st;
+
+	strcpy(disk_path, disk_by_path);
+	strncat(disk_path, path, PATH_MAX - strlen(disk_path) - 1);
+	if (stat(disk_path, &st) == 0) {
+		struct sys_dev* hba;
+		char *path;
+
+		path = devt_to_devpath(st.st_rdev, 1, NULL);
+		if (path == NULL)
+			return "unknown";
+		hba = find_disk_attached_hba(-1, path);
+		if (hba && hba->type == SYS_DEV_SAS)
+			drv = "isci";
+		else if (hba && hba->type == SYS_DEV_SATA)
+			drv = "ahci";
+		else if (hba && hba->type == SYS_DEV_VMD)
+			drv = "vmd";
+		else if (hba && hba->type == SYS_DEV_NVME)
+			drv = "nvme";
+		else
+			drv = "unknown";
+		dprintf("path: %s hba: %s attached: %s\n",
+			path, (hba) ? hba->path : "NULL", drv);
+		free(path);
+	}
+	return drv;
+}
+
+static char *imsm_find_array_devnm_by_subdev(int subdev, char *container)
+{
+	static char devnm[32];
+	char subdev_name[20];
+	struct mdstat_ent *mdstat;
+
+	sprintf(subdev_name, "%d", subdev);
+	mdstat = mdstat_by_subdev(subdev_name, container);
+	if (!mdstat)
+		return NULL;
+
+	strcpy(devnm, mdstat->devnm);
+	free_mdstat(mdstat);
+	return devnm;
+}
+
+static int imsm_reshape_is_allowed_on_container(struct supertype *st,
+						struct geo_params *geo,
+						int *old_raid_disks,
+						int direction)
+{
+	/* currently we only support increasing the number of devices
+	 * for a container.  This increases the number of device for each
+	 * member array.  They must all be RAID0 or RAID5.
+	 */
+	int ret_val = 0;
+	struct mdinfo *info, *member;
+	int devices_that_can_grow = 0;
+
+	dprintf("imsm: imsm_reshape_is_allowed_on_container(ENTER): st->devnm = (%s)\n", st->devnm);
+
+	if (geo->size > 0 ||
+	    geo->level != UnSet ||
+	    geo->layout != UnSet ||
+	    geo->chunksize != 0 ||
+	    geo->raid_disks == UnSet) {
+		dprintf("imsm: Container operation is allowed for raid disks number change only.\n");
+		return ret_val;
+	}
+
+	if (direction == ROLLBACK_METADATA_CHANGES) {
+		dprintf("imsm: Metadata changes rollback is not supported for container operation.\n");
+		return ret_val;
+	}
+
+	info = container_content_imsm(st, NULL);
+	for (member = info; member; member = member->next) {
+		char *result;
+
+		dprintf("imsm: checking device_num: %i\n",
+			member->container_member);
+
+		if (geo->raid_disks <= member->array.raid_disks) {
+			/* we work on container for Online Capacity Expansion
+			 * only so raid_disks has to grow
+			 */
+			dprintf("imsm: for container operation raid disks increase is required\n");
+			break;
+		}
+
+		if (info->array.level != 0 && info->array.level != 5) {
+			/* we cannot use this container with other raid level
+			 */
+			dprintf("imsm: for container operation wrong raid level (%i) detected\n",
+				info->array.level);
+			break;
+		} else {
+			/* check for platform support
+			 * for this raid level configuration
+			 */
+			struct intel_super *super = st->sb;
+			if (!is_raid_level_supported(super->orom,
+						     member->array.level,
+						     geo->raid_disks)) {
+				dprintf("platform does not support raid%d with %d disk%s\n",
+					 info->array.level,
+					 geo->raid_disks,
+					 geo->raid_disks > 1 ? "s" : "");
+				break;
+			}
+			/* check if component size is aligned to chunk size
+			 */
+			if (info->component_size %
+			    (info->array.chunk_size/512)) {
+				dprintf("Component size is not aligned to chunk size\n");
+				break;
+			}
+		}
+
+		if (*old_raid_disks &&
+		    info->array.raid_disks != *old_raid_disks)
+			break;
+		*old_raid_disks = info->array.raid_disks;
+
+		/* All raid5 and raid0 volumes in container
+		 * have to be ready for Online Capacity Expansion
+		 * so they need to be assembled.  We have already
+		 * checked that no recovery etc is happening.
+		 */
+		result = imsm_find_array_devnm_by_subdev(member->container_member,
+							 st->container_devnm);
+		if (result == NULL) {
+			dprintf("imsm: cannot find array\n");
+			break;
+		}
+		devices_that_can_grow++;
+	}
+	sysfs_free(info);
+	if (!member && devices_that_can_grow)
+		ret_val = 1;
+
+	if (ret_val)
+		dprintf("Container operation allowed\n");
+	else
+		dprintf("Error: %i\n", ret_val);
+
+	return ret_val;
+}
+
+/* Function: get_spares_for_grow
+ * Description: Allocates memory and creates list of spare devices
+ *		avaliable in container. Checks if spare drive size is acceptable.
+ * Parameters: Pointer to the supertype structure
+ * Returns: Pointer to the list of spare devices (mdinfo structure) on success,
+ *		NULL if fail
+ */
+static struct mdinfo *get_spares_for_grow(struct supertype *st)
+{
+	struct spare_criteria sc;
+
+	get_spare_criteria_imsm(st, &sc);
+	return container_choose_spares(st, &sc, NULL, NULL, NULL, 0);
+}
+
+/******************************************************************************
+ * function: imsm_create_metadata_update_for_reshape
+ * Function creates update for whole IMSM container.
+ *
+ ******************************************************************************/
+static int imsm_create_metadata_update_for_reshape(
+	struct supertype *st,
+	struct geo_params *geo,
+	int old_raid_disks,
+	struct imsm_update_reshape **updatep)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_super *mpb = super->anchor;
+	int update_memory_size;
+	struct imsm_update_reshape *u;
+	struct mdinfo *spares;
+	int i;
+	int delta_disks;
+	struct mdinfo *dev;
+
+	dprintf("(enter) raid_disks = %i\n", geo->raid_disks);
+
+	delta_disks = geo->raid_disks - old_raid_disks;
+
+	/* size of all update data without anchor */
+	update_memory_size = sizeof(struct imsm_update_reshape);
+
+	/* now add space for spare disks that we need to add. */
+	update_memory_size += sizeof(u->new_disks[0]) * (delta_disks - 1);
+
+	u = xcalloc(1, update_memory_size);
+	u->type = update_reshape_container_disks;
+	u->old_raid_disks = old_raid_disks;
+	u->new_raid_disks = geo->raid_disks;
+
+	/* now get spare disks list
+	 */
+	spares = get_spares_for_grow(st);
+
+	if (spares == NULL || delta_disks > spares->array.spare_disks) {
+		pr_err("imsm: ERROR: Cannot get spare devices for %s.\n", geo->dev_name);
+		i = -1;
+		goto abort;
+	}
+
+	/* we have got spares
+	 * update disk list in imsm_disk list table in anchor
+	 */
+	dprintf("imsm: %i spares are available.\n\n",
+		spares->array.spare_disks);
+
+	dev = spares->devs;
+	for (i = 0; i < delta_disks; i++) {
+		struct dl *dl;
+
+		if (dev == NULL)
+			break;
+		u->new_disks[i] = makedev(dev->disk.major,
+					  dev->disk.minor);
+		dl = get_disk_super(super, dev->disk.major, dev->disk.minor);
+		dl->index = mpb->num_disks;
+		mpb->num_disks++;
+		dev = dev->next;
+	}
+
+abort:
+	/* free spares
+	 */
+	sysfs_free(spares);
+
+	dprintf("imsm: reshape update preparation :");
+	if (i == delta_disks) {
+		dprintf_cont(" OK\n");
+		*updatep = u;
+		return update_memory_size;
+	}
+	free(u);
+	dprintf_cont(" Error\n");
+
+	return 0;
+}
+
+/******************************************************************************
+ * function: imsm_create_metadata_update_for_size_change()
+ *           Creates update for IMSM array for array size change.
+ *
+ ******************************************************************************/
+static int imsm_create_metadata_update_for_size_change(
+				struct supertype *st,
+				struct geo_params *geo,
+				struct imsm_update_size_change **updatep)
+{
+	struct intel_super *super = st->sb;
+	int update_memory_size;
+	struct imsm_update_size_change *u;
+
+	dprintf("(enter) New size = %llu\n", geo->size);
+
+	/* size of all update data without anchor */
+	update_memory_size = sizeof(struct imsm_update_size_change);
+
+	u = xcalloc(1, update_memory_size);
+	u->type = update_size_change;
+	u->subdev = super->current_vol;
+	u->new_size = geo->size;
+
+	dprintf("imsm: reshape update preparation : OK\n");
+	*updatep = u;
+
+	return update_memory_size;
+}
+
+/******************************************************************************
+ * function: imsm_create_metadata_update_for_migration()
+ *           Creates update for IMSM array.
+ *
+ ******************************************************************************/
+static int imsm_create_metadata_update_for_migration(
+					struct supertype *st,
+					struct geo_params *geo,
+					struct imsm_update_reshape_migration **updatep)
+{
+	struct intel_super *super = st->sb;
+	int update_memory_size;
+	struct imsm_update_reshape_migration *u;
+	struct imsm_dev *dev;
+	int previous_level = -1;
+
+	dprintf("(enter) New Level = %i\n", geo->level);
+
+	/* size of all update data without anchor */
+	update_memory_size = sizeof(struct imsm_update_reshape_migration);
+
+	u = xcalloc(1, update_memory_size);
+	u->type = update_reshape_migration;
+	u->subdev = super->current_vol;
+	u->new_level = geo->level;
+	u->new_layout = geo->layout;
+	u->new_raid_disks = u->old_raid_disks = geo->raid_disks;
+	u->new_disks[0] = -1;
+	u->new_chunksize = -1;
+
+	dev = get_imsm_dev(super, u->subdev);
+	if (dev) {
+		struct imsm_map *map;
+
+		map = get_imsm_map(dev, MAP_0);
+		if (map) {
+			int current_chunk_size =
+				__le16_to_cpu(map->blocks_per_strip) / 2;
+
+			if (geo->chunksize != current_chunk_size) {
+				u->new_chunksize = geo->chunksize / 1024;
+				dprintf("imsm: chunk size change from %i to %i\n",
+					current_chunk_size, u->new_chunksize);
+			}
+			previous_level = map->raid_level;
+		}
+	}
+	if (geo->level == 5 && previous_level == 0) {
+		struct mdinfo *spares = NULL;
+
+		u->new_raid_disks++;
+		spares = get_spares_for_grow(st);
+		if (spares == NULL || spares->array.spare_disks < 1) {
+			free(u);
+			sysfs_free(spares);
+			update_memory_size = 0;
+			pr_err("cannot get spare device for requested migration\n");
+			return 0;
+		}
+		sysfs_free(spares);
+	}
+	dprintf("imsm: reshape update preparation : OK\n");
+	*updatep = u;
+
+	return update_memory_size;
+}
+
+static void imsm_update_metadata_locally(struct supertype *st,
+					 void *buf, int len)
+{
+	struct metadata_update mu;
+
+	mu.buf = buf;
+	mu.len = len;
+	mu.space = NULL;
+	mu.space_list = NULL;
+	mu.next = NULL;
+	if (imsm_prepare_update(st, &mu))
+		imsm_process_update(st, &mu);
+
+	while (mu.space_list) {
+		void **space = mu.space_list;
+		mu.space_list = *space;
+		free(space);
+	}
+}
+
+/***************************************************************************
+* Function:	imsm_analyze_change
+* Description:	Function analyze change for single volume
+*		and validate if transition is supported
+* Parameters:	Geometry parameters, supertype structure,
+*		metadata change direction (apply/rollback)
+* Returns:	Operation type code on success, -1 if fail
+****************************************************************************/
+enum imsm_reshape_type imsm_analyze_change(struct supertype *st,
+					   struct geo_params *geo,
+					   int direction)
+{
+	struct mdinfo info;
+	int change = -1;
+	int check_devs = 0;
+	int chunk;
+	/* number of added/removed disks in operation result */
+	int devNumChange = 0;
+	/* imsm compatible layout value for array geometry verification */
+	int imsm_layout = -1;
+	int data_disks;
+	struct imsm_dev *dev;
+	struct imsm_map *map;
+	struct intel_super *super;
+	unsigned long long current_size;
+	unsigned long long free_size;
+	unsigned long long max_size;
+	int rv;
+
+	getinfo_super_imsm_volume(st, &info, NULL);
+	if (geo->level != info.array.level && geo->level >= 0 &&
+	    geo->level != UnSet) {
+		switch (info.array.level) {
+		case 0:
+			if (geo->level == 5) {
+				change = CH_MIGRATION;
+				if (geo->layout != ALGORITHM_LEFT_ASYMMETRIC) {
+					pr_err("Error. Requested Layout not supported (left-asymmetric layout is supported only)!\n");
+					change = -1;
+					goto analyse_change_exit;
+				}
+				imsm_layout =  geo->layout;
+				check_devs = 1;
+				devNumChange = 1; /* parity disk added */
+			} else if (geo->level == 10) {
+				change = CH_TAKEOVER;
+				check_devs = 1;
+				devNumChange = 2; /* two mirrors added */
+				imsm_layout = 0x102; /* imsm supported layout */
+			}
+			break;
+		case 1:
+		case 10:
+			if (geo->level == 0) {
+				change = CH_TAKEOVER;
+				check_devs = 1;
+				devNumChange = -(geo->raid_disks/2);
+				imsm_layout = 0; /* imsm raid0 layout */
+			}
+			break;
+		}
+		if (change == -1) {
+			pr_err("Error. Level Migration from %d to %d not supported!\n",
+			       info.array.level, geo->level);
+			goto analyse_change_exit;
+		}
+	} else
+		geo->level = info.array.level;
+
+	if (geo->layout != info.array.layout &&
+	    (geo->layout != UnSet && geo->layout != -1)) {
+		change = CH_MIGRATION;
+		if (info.array.layout == 0 && info.array.level == 5 &&
+		    geo->layout == 5) {
+			/* reshape 5 -> 4 */
+		} else if (info.array.layout == 5 && info.array.level == 5 &&
+			   geo->layout == 0) {
+			/* reshape 4 -> 5 */
+			geo->layout = 0;
+			geo->level = 5;
+		} else {
+			pr_err("Error. Layout Migration from %d to %d not supported!\n",
+			       info.array.layout, geo->layout);
+			change = -1;
+			goto analyse_change_exit;
+		}
+	} else {
+		geo->layout = info.array.layout;
+		if (imsm_layout == -1)
+			imsm_layout = info.array.layout;
+	}
+
+	if (geo->chunksize > 0 && geo->chunksize != UnSet &&
+	    geo->chunksize != info.array.chunk_size) {
+		if (info.array.level == 10) {
+			pr_err("Error. Chunk size change for RAID 10 is not supported.\n");
+			change = -1;
+			goto analyse_change_exit;
+		} else if (info.component_size % (geo->chunksize/512)) {
+			pr_err("New chunk size (%dK) does not evenly divide device size (%lluk). Aborting...\n",
+			       geo->chunksize/1024, info.component_size/2);
+			change = -1;
+			goto analyse_change_exit;
+		}
+		change = CH_MIGRATION;
+	} else {
+		geo->chunksize = info.array.chunk_size;
+	}
+
+	chunk = geo->chunksize / 1024;
+
+	super = st->sb;
+	dev = get_imsm_dev(super, super->current_vol);
+	map = get_imsm_map(dev, MAP_0);
+	data_disks = imsm_num_data_members(map);
+	/* compute current size per disk member
+	 */
+	current_size = info.custom_array_size / data_disks;
+
+	if (geo->size > 0 && geo->size != MAX_SIZE) {
+		/* align component size
+		 */
+		geo->size = imsm_component_size_alignment_check(
+				    get_imsm_raid_level(dev->vol.map),
+				    chunk * 1024, super->sector_size,
+				    geo->size * 2);
+		if (geo->size == 0) {
+			pr_err("Error. Size expansion is supported only (current size is %llu, requested size /rounded/ is 0).\n",
+				   current_size);
+			goto analyse_change_exit;
+		}
+	}
+
+	if (current_size != geo->size && geo->size > 0) {
+		if (change != -1) {
+			pr_err("Error. Size change should be the only one at a time.\n");
+			change = -1;
+			goto analyse_change_exit;
+		}
+		if ((super->current_vol + 1) != super->anchor->num_raid_devs) {
+			pr_err("Error. The last volume in container can be expanded only (%i/%s).\n",
+			       super->current_vol, st->devnm);
+			goto analyse_change_exit;
+		}
+		/* check the maximum available size
+		 */
+		rv =  imsm_get_free_size(st, dev->vol.map->num_members,
+					 0, chunk, &free_size);
+		if (rv == 0)
+			/* Cannot find maximum available space
+			 */
+			max_size = 0;
+		else {
+			max_size = free_size + current_size;
+			/* align component size
+			 */
+			max_size = imsm_component_size_alignment_check(
+					get_imsm_raid_level(dev->vol.map),
+					chunk * 1024, super->sector_size,
+					max_size);
+		}
+		if (geo->size == MAX_SIZE) {
+			/* requested size change to the maximum available size
+			 */
+			if (max_size == 0) {
+				pr_err("Error. Cannot find maximum available space.\n");
+				change = -1;
+				goto analyse_change_exit;
+			} else
+				geo->size = max_size;
+		}
+
+		if (direction == ROLLBACK_METADATA_CHANGES) {
+			/* accept size for rollback only
+			*/
+		} else {
+			/* round size due to metadata compatibility
+			*/
+			geo->size = (geo->size >> SECT_PER_MB_SHIFT)
+				    << SECT_PER_MB_SHIFT;
+			dprintf("Prepare update for size change to %llu\n",
+				geo->size );
+			if (current_size >= geo->size) {
+				pr_err("Error. Size expansion is supported only (current size is %llu, requested size /rounded/ is %llu).\n",
+				       current_size, geo->size);
+				goto analyse_change_exit;
+			}
+			if (max_size && geo->size > max_size) {
+				pr_err("Error. Requested size is larger than maximum available size (maximum available size is %llu, requested size /rounded/ is %llu).\n",
+				       max_size, geo->size);
+				goto analyse_change_exit;
+			}
+		}
+		geo->size *= data_disks;
+		geo->raid_disks = dev->vol.map->num_members;
+		change = CH_ARRAY_SIZE;
+	}
+	if (!validate_geometry_imsm(st,
+				    geo->level,
+				    imsm_layout,
+				    geo->raid_disks + devNumChange,
+				    &chunk,
+				    geo->size, INVALID_SECTORS,
+				    0, 0, info.consistency_policy, 1))
+		change = -1;
+
+	if (check_devs) {
+		struct intel_super *super = st->sb;
+		struct imsm_super *mpb = super->anchor;
+
+		if (mpb->num_raid_devs > 1) {
+			pr_err("Error. Cannot perform operation on %s- for this operation it MUST be single array in container\n",
+			       geo->dev_name);
+			change = -1;
+		}
+	}
+
+analyse_change_exit:
+	if (direction == ROLLBACK_METADATA_CHANGES &&
+	    (change == CH_MIGRATION || change == CH_TAKEOVER)) {
+		dprintf("imsm: Metadata changes rollback is not supported for migration and takeover operations.\n");
+		change = -1;
+	}
+	return change;
+}
+
+int imsm_takeover(struct supertype *st, struct geo_params *geo)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_update_takeover *u;
+
+	u = xmalloc(sizeof(struct imsm_update_takeover));
+
+	u->type = update_takeover;
+	u->subarray = super->current_vol;
+
+	/* 10->0 transition */
+	if (geo->level == 0)
+		u->direction = R10_TO_R0;
+
+	/* 0->10 transition */
+	if (geo->level == 10)
+		u->direction = R0_TO_R10;
+
+	/* update metadata locally */
+	imsm_update_metadata_locally(st, u,
+					sizeof(struct imsm_update_takeover));
+	/* and possibly remotely */
+	if (st->update_tail)
+		append_metadata_update(st, u,
+					sizeof(struct imsm_update_takeover));
+	else
+		free(u);
+
+	return 0;
+}
+
+/* Flush size update if size calculated by num_data_stripes is higher than
+ * imsm_dev_size to eliminate differences during reshape.
+ * Mdmon will recalculate them correctly.
+ * If subarray index is not set then check whole container.
+ * Returns:
+ *	0 - no error occurred
+ *	1 - error detected
+ */
+static int imsm_fix_size_mismatch(struct supertype *st, int subarray_index)
+{
+	struct intel_super *super = st->sb;
+	int tmp = super->current_vol;
+	int ret_val = 1;
+	int i;
+
+	for (i = 0; i < super->anchor->num_raid_devs; i++) {
+		if (subarray_index >= 0 && i != subarray_index)
+			continue;
+		super->current_vol = i;
+		struct imsm_dev *dev = get_imsm_dev(super, super->current_vol);
+		struct imsm_map *map = get_imsm_map(dev, MAP_0);
+		unsigned int disc_count = imsm_num_data_members(map);
+		struct geo_params geo;
+		struct imsm_update_size_change *update;
+		unsigned long long calc_size = per_dev_array_size(map) * disc_count;
+		unsigned long long d_size = imsm_dev_size(dev);
+		int u_size;
+
+		if (calc_size == d_size || dev->vol.migr_type == MIGR_GEN_MIGR)
+			continue;
+
+		/* There is a difference, confirm that imsm_dev_size is
+		 * smaller and push update.
+		 */
+		if (d_size > calc_size) {
+			pr_err("imsm: dev size of subarray %d is incorrect\n",
+				i);
+			goto exit;
+		}
+		memset(&geo, 0, sizeof(struct geo_params));
+		geo.size = d_size;
+		u_size = imsm_create_metadata_update_for_size_change(st, &geo,
+								     &update);
+		if (u_size < 1) {
+			dprintf("imsm: Cannot prepare size change update\n");
+			goto exit;
+		}
+		imsm_update_metadata_locally(st, update, u_size);
+		if (st->update_tail) {
+			append_metadata_update(st, update, u_size);
+			flush_metadata_updates(st);
+			st->update_tail = &st->updates;
+		} else {
+			imsm_sync_metadata(st);
+		}
+
+		free(update);
+	}
+	ret_val = 0;
+exit:
+	super->current_vol = tmp;
+	return ret_val;
+}
+
+static int imsm_reshape_super(struct supertype *st, unsigned long long size,
+			      int level,
+			      int layout, int chunksize, int raid_disks,
+			      int delta_disks, char *backup, char *dev,
+			      int direction, int verbose)
+{
+	int ret_val = 1;
+	struct geo_params geo;
+
+	dprintf("(enter)\n");
+
+	memset(&geo, 0, sizeof(struct geo_params));
+
+	geo.dev_name = dev;
+	strcpy(geo.devnm, st->devnm);
+	geo.size = size;
+	geo.level = level;
+	geo.layout = layout;
+	geo.chunksize = chunksize;
+	geo.raid_disks = raid_disks;
+	if (delta_disks != UnSet)
+		geo.raid_disks += delta_disks;
+
+	dprintf("for level      : %i\n", geo.level);
+	dprintf("for raid_disks : %i\n", geo.raid_disks);
+
+	if (strcmp(st->container_devnm, st->devnm) == 0) {
+		/* On container level we can only increase number of devices. */
+		dprintf("imsm: info: Container operation\n");
+		int old_raid_disks = 0;
+
+		if (imsm_reshape_is_allowed_on_container(
+			    st, &geo, &old_raid_disks, direction)) {
+			struct imsm_update_reshape *u = NULL;
+			int len;
+
+			if (imsm_fix_size_mismatch(st, -1)) {
+				dprintf("imsm: Cannot fix size mismatch\n");
+				goto exit_imsm_reshape_super;
+			}
+
+			len = imsm_create_metadata_update_for_reshape(
+				st, &geo, old_raid_disks, &u);
+
+			if (len <= 0) {
+				dprintf("imsm: Cannot prepare update\n");
+				goto exit_imsm_reshape_super;
+			}
+
+			ret_val = 0;
+			/* update metadata locally */
+			imsm_update_metadata_locally(st, u, len);
+			/* and possibly remotely */
+			if (st->update_tail)
+				append_metadata_update(st, u, len);
+			else
+				free(u);
+
+		} else {
+			pr_err("(imsm) Operation is not allowed on this container\n");
+		}
+	} else {
+		/* On volume level we support following operations
+		 * - takeover: raid10 -> raid0; raid0 -> raid10
+		 * - chunk size migration
+		 * - migration: raid5 -> raid0; raid0 -> raid5
+		 */
+		struct intel_super *super = st->sb;
+		struct intel_dev *dev = super->devlist;
+		int change;
+		dprintf("imsm: info: Volume operation\n");
+		/* find requested device */
+		while (dev) {
+			char *devnm =
+				imsm_find_array_devnm_by_subdev(
+					dev->index, st->container_devnm);
+			if (devnm && strcmp(devnm, geo.devnm) == 0)
+				break;
+			dev = dev->next;
+		}
+		if (dev == NULL) {
+			pr_err("Cannot find %s (%s) subarray\n",
+				geo.dev_name, geo.devnm);
+			goto exit_imsm_reshape_super;
+		}
+		super->current_vol = dev->index;
+		change = imsm_analyze_change(st, &geo, direction);
+		switch (change) {
+		case CH_TAKEOVER:
+			ret_val = imsm_takeover(st, &geo);
+			break;
+		case CH_MIGRATION: {
+			struct imsm_update_reshape_migration *u = NULL;
+			int len =
+				imsm_create_metadata_update_for_migration(
+					st, &geo, &u);
+			if (len < 1) {
+				dprintf("imsm: Cannot prepare update\n");
+				break;
+			}
+			ret_val = 0;
+			/* update metadata locally */
+			imsm_update_metadata_locally(st, u, len);
+			/* and possibly remotely */
+			if (st->update_tail)
+				append_metadata_update(st, u, len);
+			else
+				free(u);
+		}
+		break;
+		case CH_ARRAY_SIZE: {
+			struct imsm_update_size_change *u = NULL;
+			int len =
+				imsm_create_metadata_update_for_size_change(
+					st, &geo, &u);
+			if (len < 1) {
+				dprintf("imsm: Cannot prepare update\n");
+				break;
+			}
+			ret_val = 0;
+			/* update metadata locally */
+			imsm_update_metadata_locally(st, u, len);
+			/* and possibly remotely */
+			if (st->update_tail)
+				append_metadata_update(st, u, len);
+			else
+				free(u);
+		}
+		break;
+		default:
+			ret_val = 1;
+		}
+	}
+
+exit_imsm_reshape_super:
+	dprintf("imsm: reshape_super Exit code = %i\n", ret_val);
+	return ret_val;
+}
+
+#define COMPLETED_OK		0
+#define COMPLETED_NONE		1
+#define COMPLETED_DELAYED	2
+
+static int read_completed(int fd, unsigned long long *val)
+{
+	int ret;
+	char buf[50];
+
+	ret = sysfs_fd_get_str(fd, buf, 50);
+	if (ret < 0)
+		return ret;
+
+	ret = COMPLETED_OK;
+	if (strncmp(buf, "none", 4) == 0) {
+		ret = COMPLETED_NONE;
+	} else if (strncmp(buf, "delayed", 7) == 0) {
+		ret = COMPLETED_DELAYED;
+	} else {
+		char *ep;
+		*val = strtoull(buf, &ep, 0);
+		if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
+			ret = -1;
+	}
+	return ret;
+}
+
+/*******************************************************************************
+ * Function:	wait_for_reshape_imsm
+ * Description:	Function writes new sync_max value and waits until
+ *		reshape process reach new position
+ * Parameters:
+ *	sra		: general array info
+ *	ndata		: number of disks in new array's layout
+ * Returns:
+ *	 0 : success,
+ *	 1 : there is no reshape in progress,
+ *	-1 : fail
+ ******************************************************************************/
+int wait_for_reshape_imsm(struct mdinfo *sra, int ndata)
+{
+	int fd = sysfs_get_fd(sra, NULL, "sync_completed");
+	int retry = 3;
+	unsigned long long completed;
+	/* to_complete : new sync_max position */
+	unsigned long long to_complete = sra->reshape_progress;
+	unsigned long long position_to_set = to_complete / ndata;
+
+	if (!is_fd_valid(fd)) {
+		dprintf("cannot open reshape_position\n");
+		return 1;
+	}
+
+	do {
+		if (sysfs_fd_get_ll(fd, &completed) < 0) {
+			if (!retry) {
+				dprintf("cannot read reshape_position (no reshape in progres)\n");
+				close(fd);
+				return 1;
+			}
+			usleep(30000);
+		} else
+			break;
+	} while (retry--);
+
+	if (completed > position_to_set) {
+		dprintf("wrong next position to set %llu (%llu)\n",
+			to_complete, position_to_set);
+		close(fd);
+		return -1;
+	}
+	dprintf("Position set: %llu\n", position_to_set);
+	if (sysfs_set_num(sra, NULL, "sync_max",
+			  position_to_set) != 0) {
+		dprintf("cannot set reshape position to %llu\n",
+			position_to_set);
+		close(fd);
+		return -1;
+	}
+
+	do {
+		int rc;
+		char action[20];
+		int timeout = 3000;
+
+		sysfs_wait(fd, &timeout);
+		if (sysfs_get_str(sra, NULL, "sync_action",
+				  action, 20) > 0 &&
+				strncmp(action, "reshape", 7) != 0) {
+			if (strncmp(action, "idle", 4) == 0)
+				break;
+			close(fd);
+			return -1;
+		}
+
+		rc = read_completed(fd, &completed);
+		if (rc < 0) {
+			dprintf("cannot read reshape_position (in loop)\n");
+			close(fd);
+			return 1;
+		} else if (rc == COMPLETED_NONE)
+			break;
+	} while (completed < position_to_set);
+
+	close(fd);
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	check_degradation_change
+ * Description:	Check that array hasn't become failed.
+ * Parameters:
+ *	info	: for sysfs access
+ *	sources	: source disks descriptors
+ *	degraded: previous degradation level
+ * Returns:
+ *	degradation level
+ ******************************************************************************/
+int check_degradation_change(struct mdinfo *info,
+			     int *sources,
+			     int degraded)
+{
+	unsigned long long new_degraded;
+	int rv;
+
+	rv = sysfs_get_ll(info, NULL, "degraded", &new_degraded);
+	if (rv == -1 || (new_degraded != (unsigned long long)degraded)) {
+		/* check each device to ensure it is still working */
+		struct mdinfo *sd;
+		new_degraded = 0;
+		for (sd = info->devs ; sd ; sd = sd->next) {
+			if (sd->disk.state & (1<<MD_DISK_FAULTY))
+				continue;
+			if (sd->disk.state & (1<<MD_DISK_SYNC)) {
+				char sbuf[100];
+				int raid_disk = sd->disk.raid_disk;
+
+				if (sysfs_get_str(info,
+					sd, "state", sbuf, sizeof(sbuf)) < 0 ||
+					strstr(sbuf, "faulty") ||
+					strstr(sbuf, "in_sync") == NULL) {
+					/* this device is dead */
+					sd->disk.state = (1<<MD_DISK_FAULTY);
+					if (raid_disk >= 0)
+						close_fd(&sources[raid_disk]);
+					new_degraded++;
+				}
+			}
+		}
+	}
+
+	return new_degraded;
+}
+
+/*******************************************************************************
+ * Function:	imsm_manage_reshape
+ * Description:	Function finds array under reshape and it manages reshape
+ *		process. It creates stripes backups (if required) and sets
+ *		checkpoints.
+ * Parameters:
+ *	afd		: Backup handle (nattive) - not used
+ *	sra		: general array info
+ *	reshape		: reshape parameters - not used
+ *	st		: supertype structure
+ *	blocks		: size of critical section [blocks]
+ *	fds		: table of source device descriptor
+ *	offsets		: start of array (offest per devices)
+ *	dests		: not used
+ *	destfd		: table of destination device descriptor
+ *	destoffsets	: table of destination offsets (per device)
+ * Returns:
+ *	1 : success, reshape is done
+ *	0 : fail
+ ******************************************************************************/
+static int imsm_manage_reshape(
+	int afd, struct mdinfo *sra, struct reshape *reshape,
+	struct supertype *st, unsigned long backup_blocks,
+	int *fds, unsigned long long *offsets,
+	int dests, int *destfd, unsigned long long *destoffsets)
+{
+	int ret_val = 0;
+	struct intel_super *super = st->sb;
+	struct intel_dev *dv;
+	unsigned int sector_size = super->sector_size;
+	struct imsm_dev *dev = NULL;
+	struct imsm_map *map_src, *map_dest;
+	int migr_vol_qan = 0;
+	int ndata, odata; /* [bytes] */
+	int chunk; /* [bytes] */
+	struct migr_record *migr_rec;
+	char *buf = NULL;
+	unsigned int buf_size; /* [bytes] */
+	unsigned long long max_position; /* array size [bytes] */
+	unsigned long long next_step; /* [blocks]/[bytes] */
+	unsigned long long old_data_stripe_length;
+	unsigned long long start_src; /* [bytes] */
+	unsigned long long start; /* [bytes] */
+	unsigned long long start_buf_shift; /* [bytes] */
+	int degraded = 0;
+	int source_layout = 0;
+	int subarray_index = -1;
+
+	if (!sra)
+		return ret_val;
+
+	if (!fds || !offsets)
+		goto abort;
+
+	/* Find volume during the reshape */
+	for (dv = super->devlist; dv; dv = dv->next) {
+		if (dv->dev->vol.migr_type == MIGR_GEN_MIGR &&
+		    dv->dev->vol.migr_state == 1) {
+			dev = dv->dev;
+			migr_vol_qan++;
+			subarray_index = dv->index;
+		}
+	}
+	/* Only one volume can migrate at the same time */
+	if (migr_vol_qan != 1) {
+		pr_err("%s", migr_vol_qan ?
+			"Number of migrating volumes greater than 1\n" :
+			"There is no volume during migrationg\n");
+		goto abort;
+	}
+
+	map_dest = get_imsm_map(dev, MAP_0);
+	map_src = get_imsm_map(dev, MAP_1);
+	if (map_src == NULL)
+		goto abort;
+
+	ndata = imsm_num_data_members(map_dest);
+	odata = imsm_num_data_members(map_src);
+
+	chunk = __le16_to_cpu(map_src->blocks_per_strip) * 512;
+	old_data_stripe_length = odata * chunk;
+
+	migr_rec = super->migr_rec;
+
+	/* initialize migration record for start condition */
+	if (sra->reshape_progress == 0)
+		init_migr_record_imsm(st, dev, sra);
+	else {
+		if (__le32_to_cpu(migr_rec->rec_status) != UNIT_SRC_NORMAL) {
+			dprintf("imsm: cannot restart migration when data are present in copy area.\n");
+			goto abort;
+		}
+		/* Save checkpoint to update migration record for current
+		 * reshape position (in md). It can be farther than current
+		 * reshape position in metadata.
+		 */
+		if (save_checkpoint_imsm(st, sra, UNIT_SRC_NORMAL) == 1) {
+			/* ignore error == 2, this can mean end of reshape here
+			 */
+			dprintf("imsm: Cannot write checkpoint to migration record (UNIT_SRC_NORMAL, initial save)\n");
+			goto abort;
+		}
+	}
+
+	/* size for data */
+	buf_size = __le32_to_cpu(migr_rec->blocks_per_unit) * 512;
+	/* extend  buffer size for parity disk */
+	buf_size += __le32_to_cpu(migr_rec->dest_depth_per_unit) * 512;
+	/* add space for stripe alignment */
+	buf_size += old_data_stripe_length;
+	if (posix_memalign((void **)&buf, MAX_SECTOR_SIZE, buf_size)) {
+		dprintf("imsm: Cannot allocate checkpoint buffer\n");
+		goto abort;
+	}
+
+	max_position = sra->component_size * ndata;
+	source_layout = imsm_level_to_layout(map_src->raid_level);
+
+	while (current_migr_unit(migr_rec) <
+	       get_num_migr_units(migr_rec)) {
+		/* current reshape position [blocks] */
+		unsigned long long current_position =
+			__le32_to_cpu(migr_rec->blocks_per_unit)
+			* current_migr_unit(migr_rec);
+		unsigned long long border;
+
+		/* Check that array hasn't become failed.
+		 */
+		degraded = check_degradation_change(sra, fds, degraded);
+		if (degraded > 1) {
+			dprintf("imsm: Abort reshape due to degradation level (%i)\n", degraded);
+			goto abort;
+		}
+
+		next_step = __le32_to_cpu(migr_rec->blocks_per_unit);
+
+		if ((current_position + next_step) > max_position)
+			next_step = max_position - current_position;
+
+		start = current_position * 512;
+
+		/* align reading start to old geometry */
+		start_buf_shift = start % old_data_stripe_length;
+		start_src = start - start_buf_shift;
+
+		border = (start_src / odata) - (start / ndata);
+		border /= 512;
+		if (border <= __le32_to_cpu(migr_rec->dest_depth_per_unit)) {
+			/* save critical stripes to buf
+			 * start     - start address of current unit
+			 *             to backup [bytes]
+			 * start_src - start address of current unit
+			 *             to backup alligned to source array
+			 *             [bytes]
+			 */
+			unsigned long long next_step_filler;
+			unsigned long long copy_length = next_step * 512;
+
+			/* allign copy area length to stripe in old geometry */
+			next_step_filler = ((copy_length + start_buf_shift)
+					    % old_data_stripe_length);
+			if (next_step_filler)
+				next_step_filler = (old_data_stripe_length
+						    - next_step_filler);
+			dprintf("save_stripes() parameters: start = %llu,\tstart_src = %llu,\tnext_step*512 = %llu,\tstart_in_buf_shift = %llu,\tnext_step_filler = %llu\n",
+				start, start_src, copy_length,
+				start_buf_shift, next_step_filler);
+
+			if (save_stripes(fds, offsets, map_src->num_members,
+					 chunk, map_src->raid_level,
+					 source_layout, 0, NULL, start_src,
+					 copy_length +
+					 next_step_filler + start_buf_shift,
+					 buf)) {
+				dprintf("imsm: Cannot save stripes to buffer\n");
+				goto abort;
+			}
+			/* Convert data to destination format and store it
+			 * in backup general migration area
+			 */
+			if (save_backup_imsm(st, dev, sra,
+				buf + start_buf_shift, copy_length)) {
+				dprintf("imsm: Cannot save stripes to target devices\n");
+				goto abort;
+			}
+			if (save_checkpoint_imsm(st, sra,
+						 UNIT_SRC_IN_CP_AREA)) {
+				dprintf("imsm: Cannot write checkpoint to migration record (UNIT_SRC_IN_CP_AREA)\n");
+				goto abort;
+			}
+		} else {
+			/* set next step to use whole border area */
+			border /= next_step;
+			if (border > 1)
+				next_step *= border;
+		}
+		/* When data backed up, checkpoint stored,
+		 * kick the kernel to reshape unit of data
+		 */
+		next_step = next_step + sra->reshape_progress;
+		/* limit next step to array max position */
+		if (next_step > max_position)
+			next_step = max_position;
+		sysfs_set_num(sra, NULL, "suspend_lo", sra->reshape_progress);
+		sysfs_set_num(sra, NULL, "suspend_hi", next_step);
+		sra->reshape_progress = next_step;
+
+		/* wait until reshape finish */
+		if (wait_for_reshape_imsm(sra, ndata)) {
+			dprintf("wait_for_reshape_imsm returned error!\n");
+			goto abort;
+		}
+		if (sigterm)
+			goto abort;
+
+		if (save_checkpoint_imsm(st, sra, UNIT_SRC_NORMAL) == 1) {
+			/* ignore error == 2, this can mean end of reshape here
+			 */
+			dprintf("imsm: Cannot write checkpoint to migration record (UNIT_SRC_NORMAL)\n");
+			goto abort;
+		}
+
+	}
+
+	/* clear migr_rec on disks after successful migration */
+	struct dl *d;
+
+	memset(super->migr_rec_buf, 0, MIGR_REC_BUF_SECTORS*MAX_SECTOR_SIZE);
+	for (d = super->disks; d; d = d->next) {
+		if (d->index < 0 || is_failed(&d->disk))
+			continue;
+		unsigned long long dsize;
+
+		get_dev_size(d->fd, NULL, &dsize);
+		if (lseek64(d->fd, dsize - MIGR_REC_SECTOR_POSITION*sector_size,
+			    SEEK_SET) >= 0) {
+			if ((unsigned int)write(d->fd, super->migr_rec_buf,
+			    MIGR_REC_BUF_SECTORS*sector_size) !=
+			    MIGR_REC_BUF_SECTORS*sector_size)
+				perror("Write migr_rec failed");
+		}
+	}
+
+	/* return '1' if done */
+	ret_val = 1;
+
+	/* After the reshape eliminate size mismatch in metadata.
+	 * Don't update md/component_size here, volume hasn't
+	 * to take whole space. It is allowed by kernel.
+	 * md/component_size will be set propoperly after next assembly.
+	 */
+	imsm_fix_size_mismatch(st, subarray_index);
+
+abort:
+	free(buf);
+	/* See Grow.c: abort_reshape() for further explanation */
+	sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
+	sysfs_set_num(sra, NULL, "suspend_hi", 0);
+	sysfs_set_num(sra, NULL, "suspend_lo", 0);
+
+	return ret_val;
+}
+
+/*******************************************************************************
+ * Function:	calculate_bitmap_min_chunksize
+ * Description:	Calculates the minimal valid bitmap chunk size
+ * Parameters:
+ *	max_bits	: indicate how many bits can be used for the bitmap
+ *	data_area_size	: the size of the data area covered by the bitmap
+ *
+ * Returns:
+ *	 The bitmap chunk size
+ ******************************************************************************/
+static unsigned long long
+calculate_bitmap_min_chunksize(unsigned long long max_bits,
+			       unsigned long long data_area_size)
+{
+	unsigned long long min_chunk =
+		4096; /* sub-page chunks don't work yet.. */
+	unsigned long long bits = data_area_size / min_chunk + 1;
+
+	while (bits > max_bits) {
+		min_chunk *= 2;
+		bits = (bits + 1) / 2;
+	}
+	return min_chunk;
+}
+
+/*******************************************************************************
+ * Function:	calculate_bitmap_chunksize
+ * Description:	Calculates the bitmap chunk size for the given device
+ * Parameters:
+ *	st	: supertype information
+ *	dev	: device for the bitmap
+ *
+ * Returns:
+ *	 The bitmap chunk size
+ ******************************************************************************/
+static unsigned long long calculate_bitmap_chunksize(struct supertype *st,
+						     struct imsm_dev *dev)
+{
+	struct intel_super *super = st->sb;
+	unsigned long long min_chunksize;
+	unsigned long long result = IMSM_DEFAULT_BITMAP_CHUNKSIZE;
+	size_t dev_size = imsm_dev_size(dev);
+
+	min_chunksize = calculate_bitmap_min_chunksize(
+		IMSM_BITMAP_AREA_SIZE * super->sector_size, dev_size);
+
+	if (result < min_chunksize)
+		result = min_chunksize;
+
+	return result;
+}
+
+/*******************************************************************************
+ * Function:	init_bitmap_header
+ * Description:	Initialize the bitmap header structure
+ * Parameters:
+ *	st	: supertype information
+ *	bms	: bitmap header struct to initialize
+ *	dev	: device for the bitmap
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int init_bitmap_header(struct supertype *st, struct bitmap_super_s *bms,
+			      struct imsm_dev *dev)
+{
+	int vol_uuid[4];
+
+	if (!bms || !dev)
+		return -1;
+
+	bms->magic = __cpu_to_le32(BITMAP_MAGIC);
+	bms->version = __cpu_to_le32(BITMAP_MAJOR_HI);
+	bms->daemon_sleep = __cpu_to_le32(IMSM_DEFAULT_BITMAP_DAEMON_SLEEP);
+	bms->sync_size = __cpu_to_le64(IMSM_BITMAP_AREA_SIZE);
+	bms->write_behind = __cpu_to_le32(0);
+
+	uuid_from_super_imsm(st, vol_uuid);
+	memcpy(bms->uuid, vol_uuid, 16);
+
+	bms->chunksize = calculate_bitmap_chunksize(st, dev);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	validate_internal_bitmap_for_drive
+ * Description:	Verify if the bitmap header for a given drive.
+ * Parameters:
+ *	st	: supertype information
+ *	offset	: The offset from the beginning of the drive where to look for
+ *		  the bitmap header.
+ *	d	: the drive info
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int validate_internal_bitmap_for_drive(struct supertype *st,
+					      unsigned long long offset,
+					      struct dl *d)
+{
+	struct intel_super *super = st->sb;
+	int ret = -1;
+	int vol_uuid[4];
+	bitmap_super_t *bms;
+	int fd;
+
+	if (!d)
+		return -1;
+
+	void *read_buf;
+
+	if (posix_memalign(&read_buf, MAX_SECTOR_SIZE, IMSM_BITMAP_HEADER_SIZE))
+		return -1;
+
+	fd = d->fd;
+	if (!is_fd_valid(fd)) {
+		fd = open(d->devname, O_RDONLY, 0);
+
+		if (!is_fd_valid(fd)) {
+			dprintf("cannot open the device %s\n", d->devname);
+			goto abort;
+		}
+	}
+
+	if (lseek64(fd, offset * super->sector_size, SEEK_SET) < 0)
+		goto abort;
+	if (read(fd, read_buf, IMSM_BITMAP_HEADER_SIZE) !=
+	    IMSM_BITMAP_HEADER_SIZE)
+		goto abort;
+
+	uuid_from_super_imsm(st, vol_uuid);
+
+	bms = read_buf;
+	if ((bms->magic != __cpu_to_le32(BITMAP_MAGIC)) ||
+	    (bms->version != __cpu_to_le32(BITMAP_MAJOR_HI)) ||
+	    (!same_uuid((int *)bms->uuid, vol_uuid, st->ss->swapuuid))) {
+		dprintf("wrong bitmap header detected\n");
+		goto abort;
+	}
+
+	ret = 0;
+abort:
+	if (!is_fd_valid(d->fd))
+		close_fd(&fd);
+
+	if (read_buf)
+		free(read_buf);
+
+	return ret;
+}
+
+/*******************************************************************************
+ * Function:	validate_internal_bitmap_imsm
+ * Description:	Verify if the bitmap header is in place and with proper data.
+ * Parameters:
+ *	st	: supertype information
+ *
+ * Returns:
+ *	 0 : success or device w/o RWH_BITMAP
+ *	-1 : fail
+ ******************************************************************************/
+static int validate_internal_bitmap_imsm(struct supertype *st)
+{
+	struct intel_super *super = st->sb;
+	struct imsm_dev *dev = get_imsm_dev(super, super->current_vol);
+	unsigned long long offset;
+	struct dl *d;
+
+	if (!dev)
+		return -1;
+
+	if (dev->rwh_policy != RWH_BITMAP)
+		return 0;
+
+	offset = get_bitmap_header_sector(super, super->current_vol);
+	for (d = super->disks; d; d = d->next) {
+		if (d->index < 0 || is_failed(&d->disk))
+			continue;
+
+		if (validate_internal_bitmap_for_drive(st, offset, d)) {
+			pr_err("imsm: bitmap validation failed\n");
+			return -1;
+		}
+	}
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	add_internal_bitmap_imsm
+ * Description:	Mark the volume to use the bitmap and updates the chunk size value.
+ * Parameters:
+ *	st		: supertype information
+ *	chunkp		: bitmap chunk size
+ *	delay		: not used for imsm
+ *	write_behind	: not used for imsm
+ *	size		: not used for imsm
+ *	may_change	: not used for imsm
+ *	amajor		: not used for imsm
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int add_internal_bitmap_imsm(struct supertype *st, int *chunkp,
+				    int delay, int write_behind,
+				    unsigned long long size, int may_change,
+				    int amajor)
+{
+	struct intel_super *super = st->sb;
+	int vol_idx = super->current_vol;
+	struct imsm_dev *dev;
+
+	if (!super->devlist || vol_idx == -1 || !chunkp)
+		return -1;
+
+	dev = get_imsm_dev(super, vol_idx);
+
+	if (!dev) {
+		dprintf("cannot find the device for volume index %d\n",
+			vol_idx);
+		return -1;
+	}
+	dev->rwh_policy = RWH_BITMAP;
+
+	*chunkp = calculate_bitmap_chunksize(st, dev);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	locate_bitmap_imsm
+ * Description:	Seek 'fd' to start of write-intent-bitmap.
+ * Parameters:
+ *	st		: supertype information
+ *	fd		: file descriptor for the device
+ *	node_num	: not used for imsm
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int locate_bitmap_imsm(struct supertype *st, int fd, int node_num)
+{
+	struct intel_super *super = st->sb;
+	unsigned long long offset;
+	int vol_idx = super->current_vol;
+
+	if (!super->devlist || vol_idx == -1)
+		return -1;
+
+	offset = get_bitmap_header_sector(super, super->current_vol);
+	dprintf("bitmap header offset is %llu\n", offset);
+
+	lseek64(fd, offset << 9, 0);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	write_init_bitmap_imsm
+ * Description:	Write a bitmap header and prepares the area for the bitmap.
+ * Parameters:
+ *	st	: supertype information
+ *	fd	: file descriptor for the device
+ *	update	: not used for imsm
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int write_init_bitmap_imsm(struct supertype *st, int fd,
+				  enum bitmap_update update)
+{
+	struct intel_super *super = st->sb;
+	int vol_idx = super->current_vol;
+	int ret = 0;
+	unsigned long long offset;
+	bitmap_super_t bms = { 0 };
+	size_t written = 0;
+	size_t to_write;
+	ssize_t rv_num;
+	void *buf;
+
+	if (!super->devlist || !super->sector_size || vol_idx == -1)
+		return -1;
+
+	struct imsm_dev *dev = get_imsm_dev(super, vol_idx);
+
+	/* first clear the space for bitmap header */
+	unsigned long long bitmap_area_start =
+		get_bitmap_header_sector(super, vol_idx);
+
+	dprintf("zeroing area start (%llu) and size (%u)\n", bitmap_area_start,
+		IMSM_BITMAP_AND_HEADER_SIZE / super->sector_size);
+	if (zero_disk_range(fd, bitmap_area_start,
+			    IMSM_BITMAP_HEADER_SIZE / super->sector_size)) {
+		pr_err("imsm: cannot zeroing the space for the bitmap\n");
+		return -1;
+	}
+
+	/* The bitmap area should be filled with "1"s to perform initial
+	 * synchronization.
+	 */
+	if (posix_memalign(&buf, MAX_SECTOR_SIZE, MAX_SECTOR_SIZE))
+		return -1;
+	memset(buf, 0xFF, MAX_SECTOR_SIZE);
+	offset = get_bitmap_sector(super, vol_idx);
+	lseek64(fd, offset << 9, 0);
+	while (written < IMSM_BITMAP_AREA_SIZE) {
+		to_write = IMSM_BITMAP_AREA_SIZE - written;
+		if (to_write > MAX_SECTOR_SIZE)
+			to_write = MAX_SECTOR_SIZE;
+		rv_num = write(fd, buf, MAX_SECTOR_SIZE);
+		if (rv_num != MAX_SECTOR_SIZE) {
+			ret = -1;
+			dprintf("cannot initialize bitmap area\n");
+			goto abort;
+		}
+		written += rv_num;
+	}
+
+	/* write a bitmap header */
+	init_bitmap_header(st, &bms, dev);
+	memset(buf, 0, MAX_SECTOR_SIZE);
+	memcpy(buf, &bms, sizeof(bitmap_super_t));
+	if (locate_bitmap_imsm(st, fd, 0)) {
+		ret = -1;
+		dprintf("cannot locate the bitmap\n");
+		goto abort;
+	}
+	if (write(fd, buf, MAX_SECTOR_SIZE) != MAX_SECTOR_SIZE) {
+		ret = -1;
+		dprintf("cannot write the bitmap header\n");
+		goto abort;
+	}
+	fsync(fd);
+
+abort:
+	free(buf);
+
+	return ret;
+}
+
+/*******************************************************************************
+ * Function:	is_vol_to_setup_bitmap
+ * Description:	Checks if a bitmap should be activated on the dev.
+ * Parameters:
+ *	info	: info about the volume to setup the bitmap
+ *	dev	: the device to check against bitmap creation
+ *
+ * Returns:
+ *	 0 : bitmap should be set up on the device
+ *	-1 : otherwise
+ ******************************************************************************/
+static int is_vol_to_setup_bitmap(struct mdinfo *info, struct imsm_dev *dev)
+{
+	if (!dev || !info)
+		return -1;
+
+	if ((strcmp((char *)dev->volume, info->name) == 0) &&
+	    (dev->rwh_policy == RWH_BITMAP))
+		return -1;
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	set_bitmap_sysfs
+ * Description:	Set the sysfs atributes of a given volume to activate the bitmap.
+ * Parameters:
+ *	info		: info about the volume where the bitmap should be setup
+ *	chunksize	: bitmap chunk size
+ *	location	: location of the bitmap
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int set_bitmap_sysfs(struct mdinfo *info, unsigned long long chunksize,
+			    char *location)
+{
+	/* The bitmap/metadata is set to external to allow changing of value for
+	 * bitmap/location. When external is used, the kernel will treat an offset
+	 * related to the device's first lba (in opposition to the "internal" case
+	 * when this value is related to the beginning of the superblock).
+	 */
+	if (sysfs_set_str(info, NULL, "bitmap/metadata", "external")) {
+		dprintf("failed to set bitmap/metadata\n");
+		return -1;
+	}
+
+	/* It can only be changed when no bitmap is active.
+	 * Should be bigger than 512 and must be power of 2.
+	 * It is expecting the value in bytes.
+	 */
+	if (sysfs_set_num(info, NULL, "bitmap/chunksize",
+					  __cpu_to_le32(chunksize))) {
+		dprintf("failed to set bitmap/chunksize\n");
+		return -1;
+	}
+
+	/* It is expecting the value in sectors. */
+	if (sysfs_set_num(info, NULL, "bitmap/space",
+					  __cpu_to_le64(IMSM_BITMAP_AREA_SIZE))) {
+		dprintf("failed to set bitmap/space\n");
+		return -1;
+	}
+
+	/* Determines the delay between the bitmap updates.
+	 * It is expecting the value in seconds.
+	 */
+	if (sysfs_set_num(info, NULL, "bitmap/time_base",
+					  __cpu_to_le64(IMSM_DEFAULT_BITMAP_DAEMON_SLEEP))) {
+		dprintf("failed to set bitmap/time_base\n");
+		return -1;
+	}
+
+	/* It is expecting the value in sectors with a sign at the beginning. */
+	if (sysfs_set_str(info, NULL, "bitmap/location", location)) {
+		dprintf("failed to set bitmap/location\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Function:	set_bitmap_imsm
+ * Description:	Setup the bitmap for the given volume
+ * Parameters:
+ *	st	: supertype information
+ *	info	: info about the volume where the bitmap should be setup
+ *
+ * Returns:
+ *	 0 : success
+ *	-1 : fail
+ ******************************************************************************/
+static int set_bitmap_imsm(struct supertype *st, struct mdinfo *info)
+{
+	struct intel_super *super = st->sb;
+	int prev_current_vol = super->current_vol;
+	struct imsm_dev *dev;
+	int ret = -1;
+	char location[16] = "";
+	unsigned long long chunksize;
+	struct intel_dev *dev_it;
+
+	for (dev_it = super->devlist; dev_it; dev_it = dev_it->next) {
+		super->current_vol = dev_it->index;
+		dev = get_imsm_dev(super, super->current_vol);
+
+		if (is_vol_to_setup_bitmap(info, dev)) {
+			if (validate_internal_bitmap_imsm(st)) {
+				dprintf("bitmap header validation failed\n");
+				goto abort;
+			}
+
+			chunksize = calculate_bitmap_chunksize(st, dev);
+			dprintf("chunk size is %llu\n", chunksize);
+
+			snprintf(location, sizeof(location), "+%llu",
+				 get_bitmap_sector(super, super->current_vol));
+			dprintf("bitmap offset is %s\n", location);
+
+			if (set_bitmap_sysfs(info, chunksize, location)) {
+				dprintf("cannot setup the bitmap\n");
+				goto abort;
+			}
+		}
+	}
+	ret = 0;
+abort:
+	super->current_vol = prev_current_vol;
+	return ret;
+}
+
+struct superswitch super_imsm = {
+	.examine_super	= examine_super_imsm,
+	.brief_examine_super = brief_examine_super_imsm,
+	.brief_examine_subarrays = brief_examine_subarrays_imsm,
+	.export_examine_super = export_examine_super_imsm,
+	.detail_super	= detail_super_imsm,
+	.brief_detail_super = brief_detail_super_imsm,
+	.write_init_super = write_init_super_imsm,
+	.validate_geometry = validate_geometry_imsm,
+	.add_to_super	= add_to_super_imsm,
+	.remove_from_super = remove_from_super_imsm,
+	.detail_platform = detail_platform_imsm,
+	.export_detail_platform = export_detail_platform_imsm,
+	.kill_subarray = kill_subarray_imsm,
+	.update_subarray = update_subarray_imsm,
+	.load_container	= load_container_imsm,
+	.default_geometry = default_geometry_imsm,
+	.get_disk_controller_domain = imsm_get_disk_controller_domain,
+	.reshape_super  = imsm_reshape_super,
+	.manage_reshape = imsm_manage_reshape,
+	.recover_backup = recover_backup_imsm,
+	.examine_badblocks = examine_badblocks_imsm,
+	.match_home	= match_home_imsm,
+	.uuid_from_super= uuid_from_super_imsm,
+	.getinfo_super  = getinfo_super_imsm,
+	.getinfo_super_disks = getinfo_super_disks_imsm,
+	.update_super	= update_super_imsm,
+
+	.avail_size	= avail_size_imsm,
+	.get_spare_criteria = get_spare_criteria_imsm,
+
+	.compare_super	= compare_super_imsm,
+
+	.load_super	= load_super_imsm,
+	.init_super	= init_super_imsm,
+	.store_super	= store_super_imsm,
+	.free_super	= free_super_imsm,
+	.match_metadata_desc = match_metadata_desc_imsm,
+	.container_content = container_content_imsm,
+	.validate_container = validate_container_imsm,
+
+	.add_internal_bitmap = add_internal_bitmap_imsm,
+	.locate_bitmap = locate_bitmap_imsm,
+	.write_bitmap = write_init_bitmap_imsm,
+	.set_bitmap = set_bitmap_imsm,
+
+	.write_init_ppl = write_init_ppl_imsm,
+	.validate_ppl	= validate_ppl_imsm,
+
+	.external	= 1,
+	.name = "imsm",
+
+/* for mdmon */
+	.open_new	= imsm_open_new,
+	.set_array_state= imsm_set_array_state,
+	.set_disk	= imsm_set_disk,
+	.sync_metadata	= imsm_sync_metadata,
+	.activate_spare = imsm_activate_spare,
+	.process_update = imsm_process_update,
+	.prepare_update = imsm_prepare_update,
+	.record_bad_block = imsm_record_badblock,
+	.clear_bad_block  = imsm_clear_badblock,
+	.get_bad_blocks   = imsm_get_badblocks,
+};