cmd/format/menu_fdisk.c

	menu_fdisk.c revision 589271a44eaf1e2b6b05d80b025dc8b94e009aef
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1993, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 * This file contains functions that implement the fdisk menu commands.
 */
#include "global.h"
#include <errno.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <signal.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/dktp/fdisk.h>
#include <sys/stat.h>
#include <sys/dklabel.h>
#ifdef i386
#include <libfdisk.h>
#endif

#include "main.h"
#include "analyze.h"
#include "menu.h"
#include "menu_command.h"
#include "menu_defect.h"
#include "menu_partition.h"
#include "menu_fdisk.h"
#include "param.h"
#include "misc.h"
#include "label.h"
#include "startup.h"
#include "partition.h"
#include "prompts.h"
#include "checkdev.h"
#include "io.h"
#include "ctlr_scsi.h"
#include "auto_sense.h"

extern  struct menu_item menu_fdisk[];

/*
 * Byte swapping macros for accessing struct ipart
 *  to resolve little endian on Sparc.
 */
#if defined(sparc)
#define les(val)    ((((val)&0xFF)<<8)|(((val)>>8)&0xFF))
#define lel(val)    (((unsigned)(les((val)&0x0000FFFF))<<16) | \
            (les((unsigned)((val)&0xffff0000)>>16)))

#elif   defined(i386)

#define les(val)    (val)
#define lel(val)    (val)

#else   /* defined(sparc) */

#error  No Platform defined

#endif  /* defined(sparc) */


/* Function prototypes */
#ifdef  __STDC__

#if defined(sparc)

static int getbyte(uchar_t **);
static int getlong(uchar_t **);

#endif  /* defined(sparc) */

static int get_solaris_part(int fd, struct ipart *ipart);

#else   /* __STDC__ */

#if defined(sparc)

static int getbyte();
static int getlong();

#endif  /* defined(sparc) */

static int get_solaris_part();

#endif  /* __STDC__ */

#ifdef i386
int extpart_init(ext_part_t **epp);
#endif
/*
 * Handling the alignment problem of struct ipart.
 */
static void
fill_ipart(char *bootptr, struct ipart *partp)
{
#if defined(sparc)
    /*
     * Sparc platform:
     *
     * Packing short/word for struct ipart to resolve
     *  little endian on Sparc since it is not
     *  properly aligned on Sparc.
     */
    partp->bootid = getbyte((uchar_t **)&bootptr);
    partp->beghead = getbyte((uchar_t **)&bootptr);
    partp->begsect = getbyte((uchar_t **)&bootptr);
    partp->begcyl = getbyte((uchar_t **)&bootptr);
    partp->systid = getbyte((uchar_t **)&bootptr);
    partp->endhead = getbyte((uchar_t **)&bootptr);
    partp->endsect = getbyte((uchar_t **)&bootptr);
    partp->endcyl = getbyte((uchar_t **)&bootptr);
    partp->relsect = getlong((uchar_t **)&bootptr);
    partp->numsect = getlong((uchar_t **)&bootptr);
#elif defined(i386)
    /*
     * i386 platform:
     *
     * The fdisk table does not begin on a 4-byte boundary within
     * the master boot record; so, we need to recopy its contents
     * to another data structure to avoid an alignment exception.
     */
    (void) bcopy(bootptr, partp, sizeof (struct ipart));
#else
#error  No Platform defined
#endif /* defined(sparc) */
}

/*
 * Get a correct byte/short/word routines for Sparc platform.
 */
#if defined(sparc)
static int
getbyte(uchar_t **bp)
{
    int b;

    b = **bp;
    *bp = *bp + 1;
    return (b);
}

#ifdef DEADCODE
static int
getshort(uchar_t **bp)
{
    int b;

    b = ((**bp) << 8) | *(*bp + 1);
    *bp += 2;
    return (b);
}
#endif /* DEADCODE */

static int
getlong(uchar_t **bp)
{
    int b, bh, bl;

    bh = ((**bp) << 8) | *(*bp + 1);
    *bp += 2;
    bl = ((**bp) << 8) | *(*bp + 1);
    *bp += 2;

    b = (bh << 16) | bl;
    return (b);
}
#endif /* defined(sparc) */

#ifdef i386
/*
 * Convert emcpowerN[a-p,p0,p1,p2,p3,p4] to emcpowerNp0 path,
 * this is specific for emc powerpath driver.
 */
static void
get_emcpower_pname(char *name, char *devname)
{
    char    *emcp = "emcpower";
    char    *npt = NULL;
    char    np[MAXNAMELEN];
    int i = strlen(emcp);

    (void) strcpy(np, devname);
    npt = strstr(np, emcp);
    while ((i < strlen(npt)) && (isdigit(npt[i])))
        i++;
    npt[i] = '\0';
    (void) snprintf(name, MAXNAMELEN, "/dev/rdsk/%sp0", npt);
}
#endif

/*
 * Convert cn[tn]dn to cn[tn]dns2 path
 */
static void
get_sname(char *name)
{
    char        buf[MAXPATHLEN];
    char        *devp = "/dev/dsk";
    char        *rdevp = "/dev/rdsk";
    char        np[MAXNAMELEN];
    char        *npt;

#ifdef i386
    if (emcpower_name(cur_disk->disk_name)) {
        get_emcpower_pname(name, cur_disk->disk_name);
        return;
    }
#endif

    /*
     * If it is a full path /dev/[r]dsk/cn[tn]dn, use this path
     */
    (void) strcpy(np, cur_disk->disk_name);
    if (strncmp(rdevp, cur_disk->disk_name, strlen(rdevp)) == 0 ||
        strncmp(devp, cur_disk->disk_name, strlen(devp)) == 0) {
        /*
         * Skip if the path is already included with sN
         */
        if (strchr(np, 's') == strrchr(np, 's')) {
            npt = strrchr(np, 'p');
            /* If pN is found, do not include it */
            if (npt != NULL) {
                *npt = '\0';
            }
            (void) snprintf(buf, sizeof (buf), "%ss2", np);
        } else {
            (void) snprintf(buf, sizeof (buf), "%s", np);
        }
    } else {
        (void) snprintf(buf, sizeof (buf), "/dev/rdsk/%ss2", np);
    }
    (void) strcpy(name, buf);
}

/*
 * Convert cn[tn]dnsn to cn[tn]dnp0 path
 */
static void
get_pname(char *name)
{
    char        buf[MAXPATHLEN];
    char        *devp = "/dev/dsk";
    char        *rdevp = "/dev/rdsk";
    char        np[MAXNAMELEN];
    char        *npt;

    /*
     * If it is a full path /dev/[r]dsk/cn[tn]dnsn, use this path
     */
    if (cur_disk == NULL) {
        (void) strcpy(np, x86_devname);
    } else {
        (void) strcpy(np, cur_disk->disk_name);
    }

#ifdef i386
    if (emcpower_name(np)) {
        get_emcpower_pname(name, np);
        return;
    }
#endif

    if (strncmp(rdevp, np, strlen(rdevp)) == 0 ||
        strncmp(devp, np, strlen(devp)) == 0) {
        /*
         * Skip if the path is already included with pN
         */
        if (strchr(np, 'p') == NULL) {
            npt = strrchr(np, 's');
            /* If sN is found, do not include it */
            if (isdigit(*++npt)) {
                *--npt = '\0';
            }
            (void) snprintf(buf, sizeof (buf), "%sp0", np);
        } else {
            (void) snprintf(buf, sizeof (buf), "%s", np);
        }
    } else {
        (void) snprintf(buf, sizeof (buf), "/dev/rdsk/%sp0", np);
    }
    (void) strcpy(name, buf);
}

/*
 * Open file descriptor for current disk (cur_file)
 *  with "p0" path or cur_disk->disk_path
 */
void
open_cur_file(int mode)
{
    char    *dkpath;
    char    pbuf[MAXPATHLEN];

    switch (mode) {
        case FD_USE_P0_PATH:
            (void) get_pname(&pbuf[0]);
            dkpath = pbuf;
            break;
        case FD_USE_CUR_DISK_PATH:
            if (cur_disk->fdisk_part.systid == SUNIXOS ||
                cur_disk->fdisk_part.systid == SUNIXOS2) {
                (void) get_sname(&pbuf[0]);
                dkpath = pbuf;
            } else {
                dkpath = cur_disk->disk_path;
            }
            break;
        default:
            err_print("Error: Invalid mode option for opening "
                "cur_file\n");
            fullabort();
    }

    /* Close previous cur_file */
    (void) close(cur_file);
    /* Open cur_file with the required path dkpath */
    if ((cur_file = open_disk(dkpath, O_RDWR | O_NDELAY)) < 0) {
        err_print(
            "Error: can't open selected disk '%s'.\n", dkpath);
        fullabort();
    }
}


/*
 * This routine implements the 'fdisk' command.  It simply runs
 * the fdisk command on the current disk.
 * Use of this is restricted to interactive mode only.
 */
int
c_fdisk()
{

    char        buf[MAXPATHLEN];
    char        pbuf[MAXPATHLEN];
    struct stat statbuf;

    /*
     * We must be in interactive mode to use the fdisk command
     */
    if (option_f != (char *)NULL || isatty(0) != 1 || isatty(1) != 1) {
        err_print("Fdisk command is for interactive use only!\n");
        return (-1);
    }

    /*
     * There must be a current disk type and a current disk
     */
    if (cur_dtype == NULL) {
        err_print("Current Disk Type is not set.\n");
        return (-1);
    }

    /*
     * Before running the fdisk command, get file status of
     *  /dev/rdsk/cn[tn]dnp0 path to see if this disk
     *  supports fixed disk partition table.
     */
    (void) get_pname(&pbuf[0]);
    if (stat(pbuf, (struct stat *)&statbuf) == -1 ||
        !S_ISCHR(statbuf.st_mode)) {
        err_print(
        "Disk does not support fixed disk partition table\n");
        return (0);
    }

    /*
     * Run the fdisk program.
     */
    (void) snprintf(buf, sizeof (buf), "fdisk %s\n", pbuf);
    (void) system(buf);

    /*
     * Open cur_file with "p0" path for accessing the fdisk table
     */
    (void) open_cur_file(FD_USE_P0_PATH);

    /*
     * Get solaris partition information in the fdisk partition table
     */
    if (get_solaris_part(cur_file, &cur_disk->fdisk_part) == -1) {
        err_print("No fdisk solaris partition found\n");
        cur_disk->fdisk_part.numsect = 0;  /* No Solaris */
    }

    /*
     * Restore cur_file with cur_disk->disk_path
     */
    (void) open_cur_file(FD_USE_CUR_DISK_PATH);

    return (0);
}

/*
 * Read MBR on the disk
 * if the Solaris partition has changed,
 *  reread the vtoc
 */
#ifdef DEADCODE
static void
update_cur_parts()
{

    int i;
    register struct partition_info *parts;

    for (i = 0; i < NDKMAP; i++) {
#if defined(_SUNOS_VTOC_16)
        if (cur_parts->vtoc.v_part[i].p_tag &&
            cur_parts->vtoc.v_part[i].p_tag != V_ALTSCTR) {
            cur_parts->vtoc.v_part[i].p_start = 0;
            cur_parts->vtoc.v_part[i].p_size = 0;

#endif
            cur_parts->pinfo_map[i].dkl_nblk = 0;
            cur_parts->pinfo_map[i].dkl_cylno = 0;
            cur_parts->vtoc.v_part[i].p_tag =
                default_vtoc_map[i].p_tag;
            cur_parts->vtoc.v_part[i].p_flag =
                default_vtoc_map[i].p_flag;
#if defined(_SUNOS_VTOC_16)
        }
#endif
    }
    cur_parts->pinfo_map[C_PARTITION].dkl_nblk = ncyl * spc();

#if defined(_SUNOS_VTOC_16)
    /*
     * Adjust for the boot partitions
     */
    cur_parts->pinfo_map[I_PARTITION].dkl_nblk = spc();
    cur_parts->pinfo_map[I_PARTITION].dkl_cylno = 0;
    cur_parts->vtoc.v_part[C_PARTITION].p_start =
        cur_parts->pinfo_map[C_PARTITION].dkl_cylno * nhead * nsect;
    cur_parts->vtoc.v_part[C_PARTITION].p_size =
        cur_parts->pinfo_map[C_PARTITION].dkl_nblk;

    cur_parts->vtoc.v_part[I_PARTITION].p_start =
        cur_parts->pinfo_map[I_PARTITION].dkl_cylno;
    cur_parts->vtoc.v_part[I_PARTITION].p_size =
        cur_parts->pinfo_map[I_PARTITION].dkl_nblk;

#endif  /* defined(_SUNOS_VTOC_16) */
    parts = cur_dtype->dtype_plist;
    cur_dtype->dtype_ncyl = ncyl;
    cur_dtype->dtype_plist = cur_parts;
    parts->pinfo_name = cur_parts->pinfo_name;
    cur_disk->disk_parts = cur_parts;
    cur_ctype->ctype_dlist = cur_dtype;

}
#endif /* DEADCODE */

static int
get_solaris_part(int fd, struct ipart *ipart)
{
    int     i;
    struct ipart    ip;
    int     status;
    char        *mbr;
    char        *bootptr;
    struct dk_label update_label;
    ushort_t    found = 0;
#ifdef i386
    uint32_t    relsec, numsec;
    int     pno, rval, ext_part_found = 0;
    ext_part_t  *epp;
#endif

    (void) lseek(fd, 0, 0);

    /*
     * We may get mbr of different size, but the first 512 bytes
     * are valid information.
     */
    mbr = malloc(cur_blksz);
    if (mbr == NULL) {
        err_print("No memory available.\n");
        return (-1);
    }
    status = read(fd, mbr, cur_blksz);

    if (status != cur_blksz) {
        err_print("Bad read of fdisk partition. Status = %x\n", status);
        err_print("Cannot read fdisk partition information.\n");
        free(mbr);
        return (-1);
    }

    (void) memcpy(&boot_sec, mbr, sizeof (struct mboot));
    free(mbr);

#ifdef i386
    (void) extpart_init(&epp);
#endif
    for (i = 0; i < FD_NUMPART; i++) {
        int ipc;

        ipc = i * sizeof (struct ipart);

        /* Handling the alignment problem of struct ipart */
        bootptr = &boot_sec.parts[ipc];
        (void) fill_ipart(bootptr, &ip);

#ifdef i386
        if (fdisk_is_dos_extended(ip.systid) && (ext_part_found == 0)) {
            /* We support only one extended partition per disk */
            ext_part_found = 1;
            rval = fdisk_get_solaris_part(epp, &pno, &relsec,
                &numsec);
            if (rval == FDISK_SUCCESS) {
                /*
                 * Found a solaris partition inside the
                 * extended partition. Update the statistics.
                 */
                if (nhead != 0 && nsect != 0) {
                    pcyl = numsec / (nhead * nsect);
                    xstart = relsec / (nhead * nsect);
                    ncyl = pcyl - acyl;
                }
                solaris_offset = relsec;
                found = 2;
                ip.bootid = 0;
                ip.beghead = ip.begsect = ip.begcyl = 0xff;
                ip.endhead = ip.endsect = ip.endcyl = 0xff;
                ip.systid = SUNIXOS2;
                ip.relsect = relsec;
                ip.numsect = numsec;
                ipart->bootid = ip.bootid;
                status = bcmp(&ip, ipart,
                    sizeof (struct ipart));
                bcopy(&ip, ipart, sizeof (struct ipart));
            }
            continue;
        }
#endif

        /*
         * we are interested in Solaris and EFI partition types
         */
#ifdef i386
        if ((ip.systid == SUNIXOS &&
            (fdisk_is_linux_swap(epp, lel(ip.relsect), NULL) != 0)) ||
            ip.systid == SUNIXOS2 ||
            ip.systid == EFI_PMBR) {
#else
        if (ip.systid == SUNIXOS ||
            ip.systid == SUNIXOS2 ||
            ip.systid == EFI_PMBR) {
#endif
            /*
             * if the disk has an EFI label, nhead and nsect may
             * be zero.  This test protects us from FPE's, and
             * format still seems to work fine
             */
            if (nhead != 0 && nsect != 0) {
                pcyl = lel(ip.numsect) / (nhead * nsect);
                xstart = lel(ip.relsect) / (nhead * nsect);
                ncyl = pcyl - acyl;
            }
#ifdef DEBUG
            else {
                err_print("Critical geometry values are zero:\n"
                    "\tnhead = %d; nsect = %d\n", nhead, nsect);
            }
#endif /* DEBUG */

            solaris_offset = (uint_t)lel(ip.relsect);
            found = 1;
            break;
        }
    }

#ifdef i386
    libfdisk_fini(&epp);
#endif

    if (!found) {
        err_print("Solaris fdisk partition not found\n");
        return (-1);
    } else if (found == 1) {
        /*
         * Found a primary solaris partition.
         * compare the previous and current Solaris partition
         * but don't use bootid in determination of Solaris partition
         * changes
         */
        ipart->bootid = ip.bootid;
        status = bcmp(&ip, ipart, sizeof (struct ipart));

        bcopy(&ip, ipart, sizeof (struct ipart));
    }

    /* if the disk partitioning has changed - get the VTOC */
    if (status) {
        struct extvtoc exvtoc;
        struct vtoc vtoc;

        status = ioctl(fd, DKIOCGEXTVTOC, &exvtoc);
        if (status == -1) {
            i = errno;
            /* Try the old ioctl DKIOCGVTOC */
            status = ioctl(fd, DKIOCGVTOC, &vtoc);
            if (status == -1) {
                err_print("Bad ioctl DKIOCGEXTVTOC.\n");
                err_print("errno=%d %s\n", i, strerror(i));
                err_print("Cannot read vtoc information.\n");
                return (-1);
            }
        }

        status = read_label(fd, &update_label);
        if (status == -1) {
            err_print("Cannot read label information.\n");
            return (-1);
        }

        /* copy vtoc information */
        cur_parts->vtoc = update_label.dkl_vtoc;

#if defined(_SUNOS_VTOC_16)
        /*
         * this is to update the slice table on x86
         * we don't care about VTOC8 here
         */
        for (i = 0; i < NDKMAP; i ++) {
            cur_parts->pinfo_map[i].dkl_cylno =
                update_label.dkl_vtoc.v_part[i].p_start /
                ((int)(update_label.dkl_nhead *
                update_label.dkl_nsect));
            cur_parts->pinfo_map[i].dkl_nblk =
                update_label.dkl_vtoc.v_part[i].p_size;
        }
#endif /* defined(_SUNOS_VTOC_16) */

        cur_dtype->dtype_ncyl = update_label.dkl_ncyl;
        cur_dtype->dtype_pcyl = update_label.dkl_pcyl;
        cur_dtype->dtype_acyl = update_label.dkl_acyl;
        cur_dtype->dtype_nhead = update_label.dkl_nhead;
        cur_dtype->dtype_nsect = update_label.dkl_nsect;
        ncyl = cur_dtype->dtype_ncyl;
        acyl = cur_dtype->dtype_acyl;
        pcyl = cur_dtype->dtype_pcyl;
        nsect = cur_dtype->dtype_nsect;
        nhead = cur_dtype->dtype_nhead;
    }
    return (0);
}


int
copy_solaris_part(struct ipart *ipart)
{

    int     status, i, fd;
    struct mboot    mboot;
    char        *mbr;
    struct ipart    ip;
    char        buf[MAXPATHLEN];
    char        *bootptr;
    struct stat statbuf;
#ifdef i386
    uint32_t    relsec, numsec;
    int     pno, rval, ext_part_found = 0;
    ext_part_t  *epp;
#endif

    (void) get_pname(&buf[0]);
    if (stat(buf, &statbuf) == -1 ||
        !S_ISCHR(statbuf.st_mode) ||
        ((cur_label == L_TYPE_EFI) &&
        (cur_disk->disk_flags & DSK_LABEL_DIRTY))) {
        /*
         * Make sure to reset solaris_offset to zero if it is
         *  previously set by a selected disk that
         *  supports the fdisk table.
         */
        solaris_offset = 0;
        /*
         * Return if this disk does not support fdisk table or
         * if it uses an EFI label but has not yet been labelled.
         * If the EFI label has not been written then the open
         * on the partition will fail.
         */
        return (0);
    }

    if ((fd = open(buf, O_RDONLY)) < 0) {
        err_print("Error: can't open disk '%s'.\n", buf);
        return (-1);
    }

    /*
     * We may get mbr of different size, but the first 512 bytes
     * are valid information.
     */
    mbr = malloc(cur_blksz);
    if (mbr == NULL) {
        err_print("No memory available.\n");
        return (-1);
    }
    status = read(fd, mbr, cur_blksz);

    if (status != cur_blksz) {
        err_print("Bad read of fdisk partition.\n");
        (void) close(fd);
        free(mbr);
        return (-1);
    }

    (void) memcpy(&mboot, mbr, sizeof (struct mboot));

#ifdef i386
    (void) extpart_init(&epp);
#endif
    for (i = 0; i < FD_NUMPART; i++) {
        int ipc;

        ipc = i * sizeof (struct ipart);

        /* Handling the alignment problem of struct ipart */
        bootptr = &mboot.parts[ipc];
        (void) fill_ipart(bootptr, &ip);

#ifdef i386
        if (fdisk_is_dos_extended(ip.systid) && (ext_part_found == 0)) {
            /* We support only one extended partition per disk */
            ext_part_found = 1;
            rval = fdisk_get_solaris_part(epp, &pno, &relsec,
                &numsec);
            if (rval == FDISK_SUCCESS) {
                /*
                 * Found a solaris partition inside the
                 * extended partition. Update the statistics.
                 */
                if (nhead != 0 && nsect != 0) {
                    pcyl = numsec / (nhead * nsect);
                    ncyl = pcyl - acyl;
                }
                solaris_offset = relsec;
                ip.bootid = 0;
                ip.beghead = ip.begsect = ip.begcyl = 0xff;
                ip.endhead = ip.endsect = ip.endcyl = 0xff;
                ip.systid = SUNIXOS2;
                ip.relsect = relsec;
                ip.numsect = numsec;
                bcopy(&ip, ipart, sizeof (struct ipart));
            }
            continue;
        }
#endif


#ifdef i386
        if ((ip.systid == SUNIXOS &&
            (fdisk_is_linux_swap(epp, lel(ip.relsect), NULL) != 0)) ||
            ip.systid == SUNIXOS2 ||
            ip.systid == EFI_PMBR) {
#else
        if (ip.systid == SUNIXOS ||
            ip.systid == SUNIXOS2 ||
            ip.systid == EFI_PMBR) {
#endif
            solaris_offset = lel(ip.relsect);
            bcopy(&ip, ipart, sizeof (struct ipart));

            /*
             * if the disk has an EFI label, we typically won't
             * have values for nhead and nsect.  format seems to
             * work without them, and we need to protect ourselves
             * from FPE's
             */
            if (nhead != 0 && nsect != 0) {
                pcyl = lel(ip.numsect) / (nhead * nsect);
                ncyl = pcyl - acyl;
            }
#ifdef DEBUG
            else {
                err_print("Critical geometry values are zero:\n"
                    "\tnhead = %d; nsect = %d\n", nhead, nsect);
            }
#endif /* DEBUG */

            break;
        }
    }
#ifdef i386
    libfdisk_fini(&epp);
#endif

    (void) close(fd);
    free(mbr);
    return (0);
}

#if defined(_FIRMWARE_NEEDS_FDISK)
int
auto_solaris_part(struct dk_label *label)
{

    int     status, i, fd;
    struct mboot    mboot;
    char        *mbr;
    struct ipart    ip;
    char        *bootptr;
    char        pbuf[MAXPATHLEN];
#ifdef i386
    uint32_t    relsec, numsec;
    int     pno, rval, ext_part_found = 0;
    ext_part_t  *epp;
#endif

    (void) get_pname(&pbuf[0]);
    if ((fd = open_disk(pbuf, O_RDONLY)) < 0) {
        err_print("Error: can't open selected disk '%s'.\n", pbuf);
        return (-1);
    }

    /*
     * We may get mbr of different size, but the first 512 bytes
     * are valid information.
     */
    mbr = malloc(cur_blksz);
    if (mbr == NULL) {
        err_print("No memory available.\n");
        return (-1);
    }
    status = read(fd, mbr, cur_blksz);

    if (status != cur_blksz) {
        err_print("Bad read of fdisk partition.\n");
        free(mbr);
        return (-1);
    }

    (void) memcpy(&mboot, mbr, sizeof (struct mboot));

#ifdef i386
    (void) extpart_init(&epp);
#endif
    for (i = 0; i < FD_NUMPART; i++) {
        int ipc;

        ipc = i * sizeof (struct ipart);

        /* Handling the alignment problem of struct ipart */
        bootptr = &mboot.parts[ipc];
        (void) fill_ipart(bootptr, &ip);

#ifdef i386
        if (fdisk_is_dos_extended(ip.systid) && (ext_part_found == 0)) {
            /* We support only one extended partition per disk */
            ext_part_found = 1;
            rval = fdisk_get_solaris_part(epp, &pno, &relsec,
                &numsec);
            if (rval == FDISK_SUCCESS) {
                /*
                 * Found a solaris partition inside the
                 * extended partition. Update the statistics.
                 */
                if ((label->dkl_nhead != 0) &&
                    (label->dkl_nsect != 0)) {
                    label->dkl_pcyl =
                        numsec / (label->dkl_nhead *
                        label->dkl_nsect);
                    label->dkl_ncyl = label->dkl_pcyl -
                        label->dkl_acyl;
                }
                solaris_offset = relsec;
            }
            continue;
        }
#endif

        /*
         * if the disk has an EFI label, the nhead and nsect fields
         * the label may be zero.  This protects us from FPE's, and
         * format still seems to work happily
         */


#ifdef i386
        if ((ip.systid == SUNIXOS &&
            (fdisk_is_linux_swap(epp, lel(ip.relsect), NULL) != 0)) ||
            ip.systid == SUNIXOS2 ||
            ip.systid == EFI_PMBR) {
#else
        if (ip.systid == SUNIXOS ||
            ip.systid == SUNIXOS2 ||
            ip.systid == EFI_PMBR) {
#endif
            if ((label->dkl_nhead != 0) &&
                (label->dkl_nsect != 0)) {
                label->dkl_pcyl = lel(ip.numsect) /
                    (label->dkl_nhead * label->dkl_nsect);
                label->dkl_ncyl = label->dkl_pcyl -
                    label->dkl_acyl;
            }
#ifdef DEBUG
            else {
                err_print("Critical label fields aren't "
                    "non-zero:\n"
                    "\tlabel->dkl_nhead = %d; "
                    "label->dkl_nsect = "
                    "%d\n", label->dkl_nhead,
                    label->dkl_nsect);
            }
#endif /* DEBUG */

        solaris_offset = lel(ip.relsect);
        break;
        }
    }

#ifdef i386
    libfdisk_fini(&epp);
#endif
    (void) close(fd);
    free(mbr);
    return (0);
}
#endif  /* defined(_FIRMWARE_NEEDS_FDISK) */


int
good_fdisk()
{
    char        buf[MAXPATHLEN];
    struct stat statbuf;

    (void) get_pname(&buf[0]);
    if (stat(buf, &statbuf) == -1 ||
        !S_ISCHR(statbuf.st_mode) ||
        cur_label == L_TYPE_EFI) {
        /*
         * Return if this disk does not support fdisk table or
         * if the disk is labeled with EFI.
         */
        return (1);
    }

    if (lel(cur_disk->fdisk_part.numsect) > 0) {
        return (1);
    } else {
        err_print("WARNING - ");
        err_print("This disk may be in use by an application "
            "that has\n\t  modified the fdisk table. Ensure "
            "that this disk is\n\t  not currently in use "
            "before proceeding to use fdisk.\n");
        return (0);
    }
}

#ifdef i386
int
extpart_init(ext_part_t **epp)
{
    int     rval, lf_op_flag = 0;
    char        p0_path[MAXPATHLEN];

    get_pname(&p0_path[0]);
    lf_op_flag |= FDISK_READ_DISK;
    if ((rval = libfdisk_init(epp, p0_path, NULL, lf_op_flag)) !=
        FDISK_SUCCESS) {
        switch (rval) {
            /*
             * FDISK_EBADLOGDRIVE, FDISK_ENOLOGDRIVE
             * and FDISK_EBADMAGIC can be considered
             * as soft errors and hence we do not exit.
             */
            case FDISK_EBADLOGDRIVE:
                break;
            case FDISK_ENOLOGDRIVE:
                break;
            case FDISK_EBADMAGIC:
                break;
            case FDISK_ENOVGEOM:
                err_print("Could not get virtual geometry for"
                    " this device\n");
                fullabort();
                break;
            case FDISK_ENOPGEOM:
                err_print("Could not get physical geometry for"
                    " this device\n");
                fullabort();
                break;
            case FDISK_ENOLGEOM:
                err_print("Could not get label geometry for "
                    " this device\n");
                fullabort();
                break;
            default:
                err_print("Failed to initialise libfdisk.\n");
                fullabort();
                break;
        }
    }
    return (0);
}
#endif