imsm: assemble container support

[thirdparty/mdadm.git] / super-intel.c

/*
 * mdadm - Intel(R) Matrix Storage Manager Support
 *
 * Copyright (C) 2002-2007 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "mdadm.h"
#include <values.h>
#include <scsi/sg.h>
#include <ctype.h>

/* MPB == Metadata Parameter Block */
#define MPB_SIGNATURE "Intel Raid ISM Cfg Sig. "
#define MPB_SIG_LEN (strlen(MPB_SIGNATURE))
#define MPB_VERSION_RAID0 "1.0.00"
#define MPB_VERSION_RAID1 "1.1.00"
#define MPB_VERSION_RAID5 "1.2.02"
#define MAX_SIGNATURE_LENGTH  32
#define MAX_RAID_SERIAL_LEN   16

/* Disk configuration info. */
#define IMSM_MAX_DEVICES 255
struct imsm_disk {
        __u8 serial[MAX_RAID_SERIAL_LEN];/* 0xD8 - 0xE7 ascii serial number */
        __u32 total_blocks;              /* 0xE8 - 0xEB total blocks */
        __u32 scsi_id;                   /* 0xEC - 0xEF scsi ID */
        __u32 status;                    /* 0xF0 - 0xF3 */
#define SPARE_DISK      0x01  /* Spare */
#define CONFIGURED_DISK 0x02  /* Member of some RaidDev */
#define FAILED_DISK     0x04  /* Permanent failure */
#define USABLE_DISK     0x08  /* Fully usable unless FAILED_DISK is set */

#define IMSM_DISK_FILLERS       5
        __u32 filler[IMSM_DISK_FILLERS]; /* 0xF4 - 0x107 MPB_DISK_FILLERS for future expansion */
};

/* RAID map configuration infos. */
struct imsm_map {
        __u32 pba_of_lba0;      /* start address of partition */
        __u32 blocks_per_member;/* blocks per member */
        __u32 num_data_stripes; /* number of data stripes */
        __u16 blocks_per_strip;
        __u8  map_state;        /* Normal, Uninitialized, Degraded, Failed */
#define IMSM_T_STATE_NORMAL 0
#define IMSM_T_STATE_UNINITIALIZED 1
#define IMSM_T_STATE_DEGRADED 2 /* FIXME: is this correct? */
#define IMSM_T_STATE_FAILED 3 /* FIXME: is this correct? */
        __u8  raid_level;
#define IMSM_T_RAID0 0
#define IMSM_T_RAID1 1
#define IMSM_T_RAID5 5          /* since metadata version 1.2.02 ? */
        __u8  num_members;      /* number of member disks */
        __u8  reserved[3];
        __u32 filler[7];        /* expansion area */
        __u32 disk_ord_tbl[1];  /* disk_ord_tbl[num_members],
                                   top byte special */
} __attribute__ ((packed));

struct imsm_vol {
        __u32 reserved[2];
        __u8  migr_state;       /* Normal or Migrating */
        __u8  migr_type;        /* Initializing, Rebuilding, ... */
        __u8  dirty;
        __u8  fill[1];
        __u32 filler[5];
        struct imsm_map map[1];
        /* here comes another one if migr_state */
} __attribute__ ((packed));

struct imsm_dev {
        __u8    volume[MAX_RAID_SERIAL_LEN];
        __u32 size_low;
        __u32 size_high;
        __u32 status;   /* Persistent RaidDev status */
        __u32 reserved_blocks; /* Reserved blocks at beginning of volume */
#define IMSM_DEV_FILLERS 12
        __u32 filler[IMSM_DEV_FILLERS];
        struct imsm_vol vol;
} __attribute__ ((packed));

struct imsm_super {
        __u8 sig[MAX_SIGNATURE_LENGTH]; /* 0x00 - 0x1F */
        __u32 check_sum;                /* 0x20 - 0x23 MPB Checksum */
        __u32 mpb_size;                 /* 0x24 - 0x27 Size of MPB */
        __u32 family_num;               /* 0x28 - 0x2B Checksum from first time this config was written */
        __u32 generation_num;           /* 0x2C - 0x2F Incremented each time this array's MPB is written */
        __u32 reserved[2];              /* 0x30 - 0x37 */
        __u8 num_disks;                 /* 0x38 Number of configured disks */
        __u8 num_raid_devs;             /* 0x39 Number of configured volumes */
        __u8 fill[2];                   /* 0x3A - 0x3B */
#define IMSM_FILLERS 39
        __u32 filler[IMSM_FILLERS];     /* 0x3C - 0xD7 RAID_MPB_FILLERS */
        struct imsm_disk disk[1];       /* 0xD8 diskTbl[numDisks] */
        /* here comes imsm_dev[num_raid_devs] */
} __attribute__ ((packed));

#ifndef MDASSEMBLE
static char *map_state_str[] = { "normal", "uninitialized", "degraded", "failed" };
#endif

static unsigned long long mpb_sectors(struct imsm_super *mpb)
{
        __u32 size = __le32_to_cpu(mpb->mpb_size);

        return ((size + (512-1)) & (~(512-1))) / 512;
}

/* internal representation of IMSM metadata */
struct intel_super {
        union {
                struct imsm_super *mpb;
                void *buf;
        };
        struct dl {
                struct dl *next;
                int index;
                __u8 serial[MAX_RAID_SERIAL_LEN];
                int major, minor;
                char *devname;
                int fd;
        } *disks;
};

static struct supertype *match_metadata_desc_imsm(char *arg)
{
        struct supertype *st;

        if (strcmp(arg, "imsm") != 0 &&
            strcmp(arg, "default") != 0
                )
                return NULL;

        st = malloc(sizeof(*st));
        st->ss = &super_imsm;
        st->max_devs = IMSM_MAX_DEVICES;
        st->minor_version = 0;
        st->sb = NULL;
        return st;
}

static struct supertype *match_metadata_desc_imsm_raid(char *arg)
{
        struct supertype *st;

        if (strcmp(arg, "imsm/raid") != 0 &&
            strcmp(arg, "raid") != 0 &&
            strcmp(arg, "default") != 0
                )
                return NULL;

        st = malloc(sizeof(*st));
        st->ss = &super_imsm_raid;
        st->max_devs = IMSM_MAX_DEVICES;
        st->minor_version = 0;
        st->sb = NULL;
        return st;
}

static __u8 *get_imsm_version(struct imsm_super *mpb)
{
        return &mpb->sig[MPB_SIG_LEN];
}

static struct imsm_disk *get_imsm_disk(struct imsm_super *mpb, __u8 index)
{
        if (index > mpb->num_disks - 1)
                return NULL;
        return &mpb->disk[index];
}

static __u32 gen_imsm_checksum(struct imsm_super *mpb)
{
        __u32 end = mpb->mpb_size / sizeof(end);
        __u32 *p = (__u32 *) mpb;
        __u32 sum = 0;

        while (end--)
                sum += __le32_to_cpu(*p++);

        return sum - __le32_to_cpu(mpb->check_sum);
}

static size_t sizeof_imsm_dev(struct imsm_dev *dev)
{
        size_t size = sizeof(*dev);

        /* each map has disk_ord_tbl[num_members - 1] additional space */
        size += sizeof(__u32) * (dev->vol.map[0].num_members - 1);

        /* migrating means an additional map */
        if (dev->vol.migr_state) {
                size += sizeof(struct imsm_map);
                size += sizeof(__u32) * (dev->vol.map[1].num_members - 1);
        }

        return size;
}

static struct imsm_dev *get_imsm_dev(struct imsm_super *mpb, __u8 index)
{
        int offset;
        int i;
        void *_mpb = mpb;

        if (index > mpb->num_raid_devs - 1)
                return NULL;

        /* devices start after all disks */
        offset = ((void *) &mpb->disk[mpb->num_disks]) - _mpb;

        for (i = 0; i <= index; i++)
                if (i == index)
                        return _mpb + offset;
                else
                        offset += sizeof_imsm_dev(_mpb + offset);

        return NULL;
}

static __u32 get_imsm_disk_idx(struct imsm_map *map, int slot)
{
        __u32 *ord_tbl = &map->disk_ord_tbl[slot];

        /* top byte is 'special' */
        return __le32_to_cpu(*ord_tbl & ~(0xff << 24));
}

#ifndef MDASSEMBLE
static int get_imsm_raid_level(struct imsm_map *map)
{
        if (map->raid_level == 1) {
                if (map->num_members == 2)
                        return 1;
                else
                        return 10;
        }

        return map->raid_level;
}

static void print_imsm_dev(struct imsm_dev *dev, int index)
{
        __u64 sz;
        int slot;
        struct imsm_map *map = dev->vol.map;

        printf("\n");
        printf("[%s]:\n", dev->volume);
        printf("     RAID Level : %d\n", get_imsm_raid_level(map));
        printf("        Members : %d\n", map->num_members);
        for (slot = 0; slot < map->num_members; slot++)
                if (index == get_imsm_disk_idx(map, slot))
                        break;
        if (slot < map->num_members)
                printf("      This Slot : %d\n", slot);
        else
                printf("      This Slot : ?\n");
        sz = __le32_to_cpu(dev->size_high);
        sz <<= 32;
        sz += __le32_to_cpu(dev->size_low);
        printf("     Array Size : %llu%s\n", (unsigned long long)sz,
               human_size(sz * 512));
        sz = __le32_to_cpu(map->blocks_per_member);
        printf("   Per Dev Size : %llu%s\n", (unsigned long long)sz,
               human_size(sz * 512));
        printf("  Sector Offset : %u\n",
                __le32_to_cpu(map->pba_of_lba0));
        printf("    Num Stripes : %u\n",
                __le32_to_cpu(map->num_data_stripes));
        printf("     Chunk Size : %u KiB\n",
                __le16_to_cpu(map->blocks_per_strip) / 2);
        printf("       Reserved : %d\n", __le32_to_cpu(dev->reserved_blocks));
        printf("  Migrate State : %s\n", dev->vol.migr_state ? "migrating" : "idle");
        printf("    Dirty State : %s\n", dev->vol.dirty ? "dirty" : "clean");
        printf("      Map State : %s\n", map_state_str[map->map_state]);
}

static void print_imsm_disk(struct imsm_super *mpb, int index)
{
        struct imsm_disk *disk = get_imsm_disk(mpb, index);
        char str[MAX_RAID_SERIAL_LEN];
        __u32 s;
        __u64 sz;

        printf("\n");
        snprintf(str, MAX_RAID_SERIAL_LEN, "%s", disk->serial);
        printf("  Disk%02d Serial : %s\n", index, str);
        s = __le32_to_cpu(disk->status);
        printf("          State :%s%s%s%s\n", s&SPARE_DISK ? " spare" : "",
                                              s&CONFIGURED_DISK ? " active" : "",
                                              s&FAILED_DISK ? " failed" : "",
                                              s&USABLE_DISK ? " usable" : "");
        printf("             Id : %08x\n", __le32_to_cpu(disk->scsi_id));
        sz = __le32_to_cpu(disk->total_blocks) - mpb_sectors(mpb);
        printf("    Usable Size : %llu%s\n", (unsigned long long)sz,
               human_size(sz * 512));
}

static void examine_super_imsm(struct supertype *st, char *homehost)
{
        struct intel_super *super = st->sb;
        struct imsm_super *mpb = super->mpb;
        char str[MAX_SIGNATURE_LENGTH];
        int i;
        __u32 sum;

        snprintf(str, MPB_SIG_LEN, "%s", mpb->sig);
        printf("          Magic : %s\n", str);
        snprintf(str, strlen(MPB_VERSION_RAID0), "%s", get_imsm_version(mpb));
        printf("        Version : %s\n", get_imsm_version(mpb));
        printf("         Family : %08x\n", __le32_to_cpu(mpb->family_num));
        printf("     Generation : %08x\n", __le32_to_cpu(mpb->generation_num));
        sum = __le32_to_cpu(mpb->check_sum);
        printf("       Checksum : %08x %s\n", sum,
                gen_imsm_checksum(mpb) == sum ? "correct" : "incorrect");
        printf("          Disks : %d\n", mpb->num_disks);
        printf("   RAID Devices : %d\n", mpb->num_raid_devs);
        print_imsm_disk(mpb, super->disks->index);
        for (i = 0; i < mpb->num_raid_devs; i++)
                print_imsm_dev(get_imsm_dev(mpb, i), super->disks->index);
        for (i = 0; i < mpb->num_disks; i++) {
                if (i == super->disks->index)
                        continue;
                print_imsm_disk(mpb, i);
        }
}

static void brief_examine_super_imsm(struct supertype *st)
{
        struct intel_super *super = st->sb;
        struct imsm_super *mpb = super->mpb;

        printf("ARRAY /dev/imsm family=%08x metadata=external:imsm\n",
                __le32_to_cpu(mpb->family_num));
}

static void detail_super_imsm(struct supertype *st, char *homehost)
{
        printf("%s\n", __FUNCTION__);
}

static void brief_detail_super_imsm(struct supertype *st)
{
        printf("%s\n", __FUNCTION__);
}
#endif

static int match_home_imsm(struct supertype *st, char *homehost)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static void uuid_from_super_imsm(struct supertype *st, int uuid[4])
{
        printf("%s\n", __FUNCTION__);
}

static void getinfo_super_imsm(struct supertype *st, struct mdinfo *info)
{
        struct intel_super *super = st->sb;
        struct imsm_super *mpb = super->mpb;
        struct imsm_disk *disk;
        __u32 s;
        __u8 *v = get_imsm_version(mpb);
        __u8 *end = mpb->sig + MAX_SIGNATURE_LENGTH;
        char major[] = { 0, 0, 0 };
        char minor[] = { 0 ,0, 0 };
        char patch[] = { 0, 0, 0 };
        char *ver_parse[] = { major, minor, patch };
        int i, j;

        i = j = 0;
        while (*v != '\0' && v < end) {
                if (*v != '.' && j < 2)
                        ver_parse[i][j++] = *v;
                else {
                        i++;
                        j = 0;
                }
                v++;
        }

        info->array.major_version = 2000;
        info->array.minor_version = strtol(minor, NULL, 0);
        info->array.patch_version = strtol(patch, NULL, 0);
        info->array.raid_disks    = mpb->num_disks;
        info->array.level         = LEVEL_CONTAINER;
        info->array.layout        = 0;
        info->array.md_minor      = -1;
        info->array.ctime         = __le32_to_cpu(mpb->generation_num); //??
        info->array.utime         = 0;
        info->array.chunk_size    = 0;

        info->disk.major = 0;
        info->disk.minor = 0;
        info->disk.number = super->disks->index;
        info->disk.raid_disk = -1;
        /* is this disk a member of a raid device? */
        for (i = 0; i < mpb->num_raid_devs; i++) {
                struct imsm_dev *dev = get_imsm_dev(mpb, i);
                struct imsm_map *map = dev->vol.map;

                for (j = 0; j < map->num_members; j++) {
                        __u32 index = get_imsm_disk_idx(map, j);

                        if (index == super->disks->index) {
                                info->disk.raid_disk = super->disks->index;
                                break;
                        }
                }
                if (info->disk.raid_disk != -1)
                        break;
        }
        disk = get_imsm_disk(mpb, super->disks->index);
        s = __le32_to_cpu(disk->status);
        info->disk.state  = s & CONFIGURED_DISK ? (1 << MD_DISK_ACTIVE) : 0;
        info->disk.state |= s & FAILED_DISK ? (1 << MD_DISK_FAULTY) : 0;
        info->disk.state |= s & USABLE_DISK ? (1 << MD_DISK_SYNC) : 0;
        info->reshape_active = 0;
}

static void getinfo_super_imsm_raid(struct supertype *st, struct mdinfo *info)
{
        printf("%s\n", __FUNCTION__);
}

static int update_super_imsm(struct supertype *st, struct mdinfo *info,
                             char *update, char *devname, int verbose,
                             int uuid_set, char *homehost)
{
        /* FIXME */

        /* 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
         *
         * 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.
         *  uuid:  Change the uuid of the array to match watch is given
         *  homehost:  update the recorded homehost
         *  _reshape_progress: record new reshape_progress position.
         */
        int rv = 0;
        //struct intel_super *super = st->sb;
        //struct imsm_super *mpb = super->mpb;

        if (strcmp(update, "grow") == 0) {
        }
        if (strcmp(update, "resync") == 0) {
                /* dev->vol.dirty = 1; */
        }

        /* IMSM has no concept of UUID or homehost */

        return rv;
}

static __u64 avail_size_imsm(struct supertype *st, __u64 size)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static int compare_super_imsm(struct supertype *st, struct supertype *tst)
{
        /*
         * return:
         *  0 same, or first was empty, and second was copied
         *  1 second had wrong number
         *  2 wrong uuid
         *  3 wrong other info
         */
        struct intel_super *first = st->sb;
        struct intel_super *sec = tst->sb;

        if (!first) {
                st->sb = tst->sb;
                tst->sb = NULL;
                return 0;
        }

        if (memcmp(first->mpb->sig, sec->mpb->sig, MAX_SIGNATURE_LENGTH) != 0)
                return 3;
        if (first->mpb->family_num != sec->mpb->family_num)
                return 3;
        if (first->mpb->mpb_size != sec->mpb->mpb_size)
                return 3;
        if (first->mpb->check_sum != sec->mpb->check_sum)
                return 3;

        return 0;
}

extern int scsi_get_serial(int fd, void *buf, size_t buf_len);

static int imsm_read_serial(int fd, char *devname,
                            __u8 serial[MAX_RAID_SERIAL_LEN])
{
        unsigned char scsi_serial[255];
        struct stat stb;
        int sg_fd;
        int minor;
        char sg_path[20];
        int rv;
        int rsp_len;
        int i, cnt;

        memset(scsi_serial, 0, sizeof(scsi_serial));
        fstat(fd, &stb);
        minor = minor(stb.st_rdev);
        minor /= 16;

        sprintf(sg_path, "/dev/sg%d", minor);
        sg_fd = open(sg_path, O_RDONLY);
        if (sg_fd < 0) {
                if (devname)
                        fprintf(stderr,
                                Name ": Failed to open %s for %s: %s\n",
                                sg_path,  devname, strerror(errno));
                return 1;
        }

        rv = scsi_get_serial(sg_fd, scsi_serial, sizeof(scsi_serial));
        close(sg_fd);

        if (rv != 0) {
                if (devname)
                        fprintf(stderr,
                                Name ": Failed to retrieve serial for %s\n",
                                devname);
                return rv;
        }

        rsp_len = scsi_serial[3];
        for (i = 0, cnt = 0; i < rsp_len; i++) {
                if (!isspace(scsi_serial[4 + i]))
                        serial[cnt++] = scsi_serial[4 + i];
                if (cnt == MAX_RAID_SERIAL_LEN)
                        break;
        }

        serial[MAX_RAID_SERIAL_LEN - 1] = '\0';

        return 0;
}

static int
load_imsm_disk(int fd, struct intel_super *super, char *devname, int keep_fd)
{
        struct imsm_super *mpb = super->mpb;
        struct dl *dl;
        struct stat stb;
        struct imsm_disk *disk;
        int rv;
        int i;

        dl = malloc(sizeof(*dl));
        if (!dl) {
                if (devname)
                        fprintf(stderr,
                                Name ": failed to allocate disk buffer for %s\n",
                                devname);
                return 2;
        }
        memset(dl, 0, sizeof(*dl));

        fstat(fd, &stb);
        dl->major = major(stb.st_rdev);
        dl->minor = minor(stb.st_rdev);
        dl->next = super->disks;
        dl->fd = keep_fd ? fd : -1;
        dl->devname = devname ? strdup(devname) : NULL;
        dl->index = -1;
        super->disks = dl;
        rv = imsm_read_serial(fd, devname, dl->serial);

        if (rv != 0)
                return 2;

        /* look up this disk's index */
        for (i = 0; i < mpb->num_disks; i++) {
                disk = get_imsm_disk(mpb, i);

                if (memcmp(disk->serial, dl->serial, MAX_RAID_SERIAL_LEN) == 0)
                        break;
        }

        if (i > mpb->num_disks)
                return 2;

        dl->index = i;

        return 0;
}

/* load_imsm_mpb - read matrix metadata
 * allocates super->mpb to be freed by free_super
 */
static int load_imsm_mpb(int fd, struct intel_super *super, char *devname)
{
        unsigned long long dsize;
        size_t len, mpb_size;
        unsigned long long sectors;
        struct stat;
        struct imsm_super anchor;
        __u32 check_sum;

        memset(super, 0, sizeof(*super));
        get_dev_size(fd, NULL, &dsize);

        if (lseek64(fd, dsize - (512 * 2), SEEK_SET) < 0) {
                if (devname)
                        fprintf(stderr,
                                Name ": Cannot seek to anchor block on %s: %s\n",
                                devname, strerror(errno));
                return 1;
        }

        len = sizeof(anchor);
        if (read(fd, &anchor, len) != len) {
                if (devname)
                        fprintf(stderr,
                                Name ": Cannot read anchor block on %s: %s\n",
                                devname, strerror(errno));
                return 1;
        }

        if (strncmp((char *) anchor.sig, MPB_SIGNATURE, MPB_SIG_LEN) != 0) {
                if (devname)
                        fprintf(stderr,
                                Name ": no IMSM anchor on %s\n", devname);
                return 2;
        }

        mpb_size = __le32_to_cpu(anchor.mpb_size);
        super->mpb = malloc(mpb_size < 512 ? 512 : mpb_size);
        if (!super->mpb) {
                if (devname)
                        fprintf(stderr,
                                Name ": unable to allocate %zu byte mpb buffer\n",
                                mpb_size);
                return 2;
        }
        memcpy(super->buf, &anchor, sizeof(anchor));

        /* read the rest of the first block */
        len = 512 - sizeof(anchor);
        if (read(fd, super->buf + sizeof(anchor), len) != len) {
                if (devname)
                        fprintf(stderr,
                                Name ": Cannot read anchor remainder on %s: %s\n",
                                devname, strerror(errno));
                return 2;
        }

        sectors = mpb_sectors(&anchor) - 1;
        if (!sectors)
                return load_imsm_disk(fd, super, devname, 0);

        /* read the extended mpb */
        if (lseek64(fd, dsize - (512 * (2 + sectors)), SEEK_SET) < 0) {
                if (devname)
                        fprintf(stderr,
                                Name ": Cannot seek to extended mpb on %s: %s\n",
                                devname, strerror(errno));
                return 1;
        }

        len = mpb_size - 512;
        if (read(fd, super->buf + 512, len) != len) {
                if (devname)
                        fprintf(stderr,
                                Name ": Cannot read extended mpb on %s: %s\n",
                                devname, strerror(errno));
                return 2;
        }

        check_sum = gen_imsm_checksum(super->mpb);
        if (check_sum != __le32_to_cpu(super->mpb->check_sum)) {
                if (devname)
                        fprintf(stderr,
                                Name ": IMSM checksum %x != %x on %s\n",
                                check_sum, __le32_to_cpu(super->mpb->check_sum),
                                devname);
                return 2;
        }

        return load_imsm_disk(fd, super, devname, 0);
}

struct superswitch super_imsm_container;

static void free_imsm_disks(struct intel_super *super)
{
        while (super->disks) {
                struct dl *d = super->disks;

                super->disks = d->next;
                if (d->fd >= 0)
                        close(d->fd);
                if (d->devname)
                        free(d->devname);
                free(d);
        }
}

static void free_imsm(struct intel_super *super)
{
        if (super->mpb)
                free(super->mpb);
        free_imsm_disks(super);
        free(super);
}


static void free_super_imsm(struct supertype *st)
{
        struct intel_super *super = st->sb;

        if (!super)
                return;

        free_imsm(super);
        st->sb = NULL;
}

#ifndef MDASSEMBLE
static int load_super_imsm_all(struct supertype *st, int fd, void **sbp,
                               char *devname, int keep_fd)
{
        struct mdinfo *sra;
        struct intel_super *super;
        struct mdinfo *sd, *best = NULL;
        __u32 bestgen = 0;
        __u32 gen;
        char nm[20];
        int dfd;
        int rv;

        /* check if this disk is a member of an active array */
        sra = sysfs_read(fd, 0, GET_LEVEL|GET_VERSION|GET_DEVS|GET_STATE);
        if (!sra)
                return 1;

        if (sra->array.major_version != -1 ||
            sra->array.minor_version != -2 ||
            strcmp(sra->text_version, "imsm") != 0)
                return 1;

        super = malloc(sizeof(*super));
        if (!super)
                return 1;

        /* find the most up to date disk in this array */
        for (sd = sra->devs; sd; sd = sd->next) {
                sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor);
                dfd = dev_open(nm, keep_fd ? O_RDWR : O_RDONLY);
                if (!dfd) {
                        free_imsm(super);
                        return 2;
                }
                rv = load_imsm_mpb(dfd, super, NULL);
                if (!keep_fd)
                        close(dfd);
                if (rv == 0) {
                        gen = __le32_to_cpu(super->mpb->generation_num);
                        if (!best || gen > bestgen) {
                                bestgen = gen;
                                best = sd;
                        }
                } else {
                        free_imsm(super);
                        return 2;
                }
        }

        if (!best) {
                free_imsm(super);
                return 1;
        }

        /* load the most up to date anchor */
        sprintf(nm, "%d:%d", best->disk.major, best->disk.minor);
        dfd = dev_open(nm, O_RDONLY);
        if (!dfd) {
                free_imsm(super);
                return 1;
        }
        rv = load_imsm_mpb(dfd, super, NULL);
        close(dfd);
        if (rv != 0) {
                free_imsm(super);
                return 2;
        }

        /* reset the disk list */
        free_imsm_disks(super);

        /* populate disk list */
        for (sd = sra->devs ; sd ; sd = sd->next) {
                sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor);
                dfd = dev_open(nm, keep_fd? O_RDWR : O_RDONLY);
                if (!dfd) {
                        free_imsm(super);
                        return 2;
                }
                load_imsm_disk(dfd, super, NULL, keep_fd);
                if (!keep_fd)
                        close(dfd);
        }

        *sbp = super;
        if (st->ss == NULL) {
                st->ss = &super_imsm_container;
                st->minor_version = 0;
                st->max_devs = IMSM_MAX_DEVICES;
        }

        return 0;
}
#endif

static int load_super_imsm(struct supertype *st, int fd, char *devname)
{
        struct intel_super *super;
        int rv;

#ifndef MDASSEMBLE
        if (load_super_imsm_all(st, fd, &st->sb, devname, 0) == 0)
                return 0;
#endif

        super = malloc(sizeof(*super));
        if (!super) {
                fprintf(stderr,
                        Name ": malloc of %zu failed.\n",
                        sizeof(*super));
                return 1;
        }

        rv = load_imsm_mpb(fd, super, devname);

        if (rv) {
                if (devname)
                        fprintf(stderr,
                                Name ": Failed to load all information "
                                "sections on %s\n", devname);
                free_imsm(super);
                return rv;
        }

        st->sb = super;
        if (st->ss == NULL) {
                st->ss = &super_imsm;
                st->minor_version = 0;
                st->max_devs = IMSM_MAX_DEVICES;
        }

        return 0;
}

static int init_zero_imsm(struct supertype *st, mdu_array_info_t *info,
                          unsigned long long size, char *name,
                          char *homehost, int *uuid)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static int init_super_imsm(struct supertype *st, mdu_array_info_t *info,
                           unsigned long long size, char *name,
                           char *homehost, int *uuid)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static int init_super_imsm_raid(struct supertype *st, mdu_array_info_t *info,
                                unsigned long long size, char *name,
                                char *homehost, int *uuid)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static void add_to_super_imsm(struct supertype *st, mdu_disk_info_t *dinfo,
                              int fd, char *devname)
{
        printf("%s\n", __FUNCTION__);
}

static void add_to_super_imsm_raid(struct supertype *st, mdu_disk_info_t *dinfo,
                                   int fd, char *devname)
{
        printf("%s\n", __FUNCTION__);
}

static int write_init_super_imsm(struct supertype *st)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static int store_zero_imsm(struct supertype *st, int fd)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static void getinfo_super_n_imsm_container(struct supertype *st, struct mdinfo *info)
{
        /* just need offset and size...
         * of the metadata??
         */
        struct intel_super *super = st->sb;
        struct imsm_super *mpb = super->mpb;
        struct imsm_disk *disk = get_imsm_disk(mpb, info->disk.number);
        int sect = mpb_sectors(mpb);

        info->data_offset = __le32_to_cpu(disk->total_blocks) - (2 + sect - 1);
        info->component_size = sect;
}

static void getinfo_super_n_raid(struct supertype *st, struct mdinfo *info)
{
        printf("%s\n", __FUNCTION__);
}

static int validate_geometry_imsm(struct supertype *st, int level, int layout,
                                  int raiddisks, int chunk, unsigned long long size,
                                  char *subdev, unsigned long long *freesize)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static int validate_geometry_imsm_container(struct supertype *st, int level,
                                            int layout, int raiddisks, int chunk,
                                            unsigned long long size, char *subdev,
                                            unsigned long long *freesize)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}

static int validate_geometry_imsm_raid(struct supertype *st, int level,
                                       int layout, int raiddisks, int chunk,
                                       unsigned long long size, char *subdev,
                                       unsigned long long *freesize)
{
        printf("%s\n", __FUNCTION__);

        return 0;
}



static struct mdinfo *container_content_imsm(struct supertype *st)
{
        printf("%s\n", __FUNCTION__);

        return NULL;
}

struct superswitch super_imsm = {
#ifndef MDASSEMBLE
        .examine_super  = examine_super_imsm,
        .brief_examine_super = brief_examine_super_imsm,
        .detail_super   = detail_super_imsm,
        .brief_detail_super = brief_detail_super_imsm,
#endif
        .match_home     = match_home_imsm,
        .uuid_from_super= uuid_from_super_imsm,
        .getinfo_super  = getinfo_super_imsm,
        .update_super   = update_super_imsm,

        .avail_size     = avail_size_imsm,

        .compare_super  = compare_super_imsm,

        .load_super     = load_super_imsm,
        .init_super     = init_zero_imsm,
        .store_super    = store_zero_imsm,
        .free_super     = free_super_imsm,
        .match_metadata_desc = match_metadata_desc_imsm,
        .getinfo_super_n  = getinfo_super_n_imsm_container,

        .validate_geometry = validate_geometry_imsm,
        .major          = 2000,
        .swapuuid       = 0,
        .external       = 1,
        .text_version   = "imsm",
};

/* super_imsm_container is set by validate_geometry_imsm when given a
 * device that is not part of any array
 */
struct superswitch super_imsm_container = {

        .validate_geometry = validate_geometry_imsm_container,
        .init_super     = init_super_imsm,
        .add_to_super   = add_to_super_imsm,
        .write_init_super = write_init_super_imsm,
        .getinfo_super  = getinfo_super_imsm,
        .getinfo_super_n  = getinfo_super_n_imsm_container,
        .load_super     = load_super_imsm,

#ifndef MDASSEMBLE
        .examine_super  = examine_super_imsm,
        .brief_examine_super = brief_examine_super_imsm,
        .detail_super   = detail_super_imsm,
        .brief_detail_super = brief_detail_super_imsm,
#endif

        .free_super     = free_super_imsm,

        .container_content = container_content_imsm,

        .major          = 2000,
        .swapuuid       = 0,
        .external       = 1,
        .text_version   = "imsm",
};

struct superswitch super_imsm_raid = {
        .update_super   = update_super_imsm,
        .init_super     = init_super_imsm_raid,
        .add_to_super   = add_to_super_imsm_raid,
        .getinfo_super  = getinfo_super_imsm_raid,
        .getinfo_super_n  = getinfo_super_n_raid,
        .write_init_super = write_init_super_imsm,

        .load_super     = load_super_imsm,
        .free_super     = free_super_imsm,
        .match_metadata_desc = match_metadata_desc_imsm_raid,


        .validate_geometry = validate_geometry_imsm_raid,
        .major          = 2001,
        .swapuuid       = 0,
        .external       = 2,
        .text_version   = "imsm",
};