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fdisksgilabel.c

/*
 *
 * fdisksgilabel.c
 *
 * Copyright (C) Andreas Neuper, Sep 1998.
 *    This file may be modified and redistributed under
 *    the terms of the GNU Public License.
 *
 * 1999-03-20 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *    Internationalization
 *
 * 2003-03-20 Phillip Kesling <pkesling@sgi.com>
 *      Some fixes
 */
#include <stdio.h>              /* stderr */
#include <stdlib.h>           /* exit */
#include <string.h>             /* strstr */
#include <unistd.h>             /* write */
#include <sys/ioctl.h>          /* ioctl */
#include <sys/stat.h>           /* stat */
#include <assert.h>             /* assert */

#include <endian.h>
#include "nls.h"
#include <linux/major.h>        /* FLOPPY_MAJOR */

#include "common.h"
#include "fdisk.h"
#include "fdisksgilabel.h"

static      int     other_endian = 0;
static      int     debug = 0;
static  short volumes=1;

/*
 * only dealing with free blocks here
 */

typedef struct { unsigned int first; unsigned int last; } freeblocks;
static freeblocks freelist[17]; /* 16 partitions can produce 17 vacant slots */

static void
setfreelist(int i, unsigned int f, unsigned int l) {
      freelist[i].first = f;
      freelist[i].last = l;
}

static void
add2freelist(unsigned int f, unsigned int l) {
      int i = 0;
      for ( ; i < 17 ; i++)
            if (freelist[i].last == 0)
                  break;
      setfreelist(i, f, l);
}

static void
clearfreelist(void) {
      int i;

      for (i = 0; i < 17 ; i++)
            setfreelist(i, 0, 0);
}

static unsigned int
isinfreelist(unsigned int b) {
      int i;

      for (i = 0; i < 17 ; i++)
            if (freelist[i].first <= b && freelist[i].last >= b)
                  return freelist[i].last;
      return 0;
}
      /* return last vacant block of this stride (never 0). */
      /* the '>=' is not quite correct, but simplifies the code */
/*
 * end of free blocks section
 */
struct systypes sgi_sys_types[] = {
      {SGI_VOLHDR,      N_("SGI volhdr")},
      {0x01,            N_("SGI trkrepl")},
      {0x02,            N_("SGI secrepl")},
      {SGI_SWAP,  N_("SGI raw")},
      {0x04,            N_("SGI bsd")},
      {0x05,            N_("SGI sysv")},
      {ENTIRE_DISK,     N_("SGI volume")},
      {SGI_EFS,   N_("SGI efs")},
      {0x08,            N_("SGI lvol")},
      {0x09,            N_("SGI rlvol")},
      {SGI_XFS,   N_("SGI xfs")},
      {SGI_XFSLOG,      N_("SGI xfslog")},
      {SGI_XLV,   N_("SGI xlv")},
      {SGI_XVM,   N_("SGI xvm")},
      {LINUX_SWAP,      N_("Linux swap")},
      {LINUX_NATIVE,    N_("Linux native")},
      {LINUX_LVM, N_("Linux LVM")},
      {LINUX_RAID,      N_("Linux RAID")},
      {0, NULL }
};

static inline unsigned short
__swap16(unsigned short x) {
        return (((__u16)(x) & 0xFF) << 8) | (((__u16)(x) & 0xFF00) >> 8);
}

static inline __u32
__swap32(__u32 x) {
        return (((x & 0xFF) << 24) |
            ((x & 0xFF00) << 8) |
            ((x & 0xFF0000) >> 8) |
            ((x & 0xFF000000) >> 24));
}

static int
sgi_get_nsect(void) {
      return SSWAP16(sgilabel->devparam.nsect);
}

static int
sgi_get_ntrks(void) {
      return SSWAP16(sgilabel->devparam.ntrks);
}

#if 0
static int
sgi_get_head_vol0(void) {
      return SSWAP16(sgilabel->devparam.head_vol0);
}

static int
sgi_get_bytes(void) {
      return SSWAP16(sgilabel->devparam.bytes);
}

static int
sgi_get_pcylcount(void) {
      return SSWAP16(sgilabel->devparam.pcylcount);
}
#endif

void
sgi_nolabel() {
      sgilabel->magic = 0;
      sgi_label = 0;
      partitions = 4;
}

static unsigned int
two_s_complement_32bit_sum(unsigned int *base, int size /* in bytes */) {
      int i = 0;
      unsigned int sum = 0;

      size /= sizeof(unsigned int);
      for (i = 0; i < size; i++)
            sum -= SSWAP32(base[i]);
      return sum;
}

int
check_sgi_label() {
      if (sizeof(sgilabel) > 512) {
            fprintf(stderr,
                  _("According to MIPS Computer Systems, Inc the "
                    "Label must not contain more than 512 bytes\n"));
            exit(1);
      }

      if (sgilabel->magic != SGI_LABEL_MAGIC &&
          sgilabel->magic != SGI_LABEL_MAGIC_SWAPPED) {
            sgi_label = 0;
            other_endian = 0;
            return 0;
      }

      other_endian = (sgilabel->magic == SGI_LABEL_MAGIC_SWAPPED);
      /*
       * test for correct checksum
       */
      if (two_s_complement_32bit_sum((unsigned int*)sgilabel,
                               sizeof(*sgilabel))) {
            fprintf(stderr,
                  _("Detected sgi disklabel with wrong checksum.\n"));
      }
      update_units();
      sgi_label = 1;
      partitions= 16;
      volumes = 15;
      return 1;
}

void
sgi_list_table(int xtra) {
      int i, w;
      int kpi = 0;            /* kernel partition ID */
      char *type;

      w = strlen(disk_device);

      if (xtra) {
            printf(_("\nDisk %s (SGI disk label): %d heads, %d sectors\n"
                   "%d cylinders, %d physical cylinders\n"
                   "%d extra sects/cyl, interleave %d:1\n"
                   "%s\n"
                   "Units = %s of %d * %d bytes\n\n"),
                   disk_device, heads, sectors, cylinders,
                   SSWAP16(sgiparam.pcylcount),
                   SSWAP16(sgiparam.sparecyl),
                   SSWAP16(sgiparam.ilfact),
                   (char *)sgilabel,
                   str_units(PLURAL), units_per_sector,
                       sector_size);
      } else {
            printf(_("\nDisk %s (SGI disk label): "
                   "%d heads, %d sectors, %d cylinders\n"
                   "Units = %s of %d * %d bytes\n\n"),
                   disk_device, heads, sectors, cylinders,
                   str_units(PLURAL), units_per_sector,
                       sector_size);
      }
      printf(_("----- partitions -----\n"
             "Pt# %*s  Info     Start       End   Sectors  Id  System\n"),
             w + 1, _("Device"));
      for (i = 0 ; i < partitions; i++) {
            if (sgi_get_num_sectors(i) || debug) {
                  __u32 start = sgi_get_start_sector(i);
                  __u32 len = sgi_get_num_sectors(i);
                  kpi++;            /* only count nonempty partitions */
                  printf(
                        "%2d: %s %4s %9ld %9ld %9ld  %2x  %s\n",
/* fdisk part number */   i+1,
/* device */              partname(disk_device, kpi, w+2),
/* flags */               (sgi_get_swappartition() == i) ? "swap" :
/* flags */               (sgi_get_bootpartition() == i) ? "boot" : "    ", 
/* start */               (long) scround(start),
/* end */                 (long) scround(start+len)-1,
/* no odd flag on end */  (long) len, 
/* type id */             sgi_get_sysid(i),
/* type name */           (type = partition_type(sgi_get_sysid(i)))
                        ? type : _("Unknown"));
            }
      }
      printf(_("----- Bootinfo -----\nBootfile: %s\n"
             "----- Directory Entries -----\n"),
             sgilabel->boot_file);
      for (i = 0 ; i < volumes; i++) {
            if (sgilabel->directory[i].vol_file_size) {
                  __u32 start = SSWAP32(sgilabel->directory[i].vol_file_start);
                  __u32 len = SSWAP32(sgilabel->directory[i].vol_file_size);
                  char *name = sgilabel->directory[i].vol_file_name;
                  printf(_("%2d: %-10s sector%5u size%8u\n"),
                         i, name, (unsigned int) start,
                         (unsigned int) len);
            }
      }
}

unsigned int
sgi_get_start_sector(int i) {
      return SSWAP32(sgilabel->partitions[i].start_sector);
}

unsigned int
sgi_get_num_sectors(int i) {
      return SSWAP32(sgilabel->partitions[i].num_sectors);
}

int
sgi_get_sysid(int i)
{
      return SSWAP32(sgilabel->partitions[i].id);
}

int
sgi_get_bootpartition(void)
{
      return SSWAP16(sgilabel->boot_part);
}

int
sgi_get_swappartition(void)
{
      return SSWAP16(sgilabel->swap_part);
}

void
sgi_set_bootpartition(int i)
{
      sgilabel->boot_part = SSWAP16(((short)i));
}

static unsigned int
sgi_get_lastblock(void) {
      return heads * sectors * cylinders;
}

void
sgi_set_swappartition(int i) {
      sgilabel->swap_part = SSWAP16(((short)i));
}

static int
sgi_check_bootfile(const char* aFile) {
      if (strlen(aFile) < 3) /* "/a\n" is minimum */ {
            printf(_("\nInvalid Bootfile!\n"
                   "\tThe bootfile must be an absolute non-zero pathname,\n"
                   "\te.g. \"/unix\" or \"/unix.save\".\n"));
            return 0;
      } else {
            if (strlen(aFile) > 16) {
                  printf(_("\n\tName of Bootfile too long:  "
                         "16 bytes maximum.\n"));
                  return 0;
            } else {
                  if (aFile[0] != '/') {
                        printf(_("\n\tBootfile must have a "
                               "fully qualified pathname.\n"));
                        return 0;
                  }
            }
      }
      if (strncmp(aFile, sgilabel->boot_file, 16)) {
            printf(_("\n\tBe aware, that the bootfile is not checked for existence.\n\t"
                   "SGI's default is \"/unix\" and for backup \"/unix.save\".\n"));
            /* filename is correct and did change */
            return 1;
      }
      return 0;   /* filename did not change */
}

const char *
sgi_get_bootfile(void) {
      return sgilabel->boot_file;
}

void
sgi_set_bootfile(const char* aFile) {
      int i = 0;

      if (sgi_check_bootfile(aFile)) {
            while (i < 16) {
                  if ((aFile[i] != '\n')  /* in principle caught again by next line */
                      &&  (strlen(aFile) > i))
                        sgilabel->boot_file[i] = aFile[i];
                  else
                        sgilabel->boot_file[i] = 0;
                  i++;
            }
            printf(_("\n\tBootfile is changed to \"%s\".\n"),
                   sgilabel->boot_file);
      }
}

void
create_sgiinfo(void) {
      /* I keep SGI's habit to write the sgilabel to the second block */
      sgilabel->directory[0].vol_file_start = SSWAP32(2);
      sgilabel->directory[0].vol_file_size = SSWAP32(sizeof(sgiinfo));
      strncpy(sgilabel->directory[0].vol_file_name, "sgilabel", 8);
}

sgiinfo *fill_sgiinfo(void);

void
sgi_write_table(void) {
      sgilabel->csum = 0;
      sgilabel->csum = SSWAP32(two_s_complement_32bit_sum(
            (unsigned int*)sgilabel, 
            sizeof(*sgilabel)));
      assert(two_s_complement_32bit_sum(
            (unsigned int*)sgilabel, sizeof(*sgilabel)) == 0);
      if (lseek(fd, 0, SEEK_SET) < 0)
            fatal(unable_to_seek);
      if (write(fd, sgilabel, SECTOR_SIZE) != SECTOR_SIZE)
            fatal(unable_to_write);
      if (! strncmp(sgilabel->directory[0].vol_file_name, "sgilabel", 8)) {
            /*
             * keep this habit of first writing the "sgilabel".
             * I never tested whether it works without (AN 981002).
             */
            sgiinfo *info = fill_sgiinfo();
            int infostartblock = SSWAP32(sgilabel->directory[0].vol_file_start);
            if (ext2_llseek(fd, (long long)infostartblock*
                        SECTOR_SIZE, SEEK_SET) < 0)
                  fatal(unable_to_seek);
            if (write(fd, info, SECTOR_SIZE) != SECTOR_SIZE)
                  fatal(unable_to_write);
            free(info);
      }
}

static int
compare_start(int *x, int *y) {
      /*
       * sort according to start sectors
       * and prefers largest partition:
       * entry zero is entire disk entry
       */
      unsigned int i = *x;
      unsigned int j = *y;
      unsigned int a = sgi_get_start_sector(i);
      unsigned int b = sgi_get_start_sector(j);
      unsigned int c = sgi_get_num_sectors(i);
      unsigned int d = sgi_get_num_sectors(j);

      if (a == b)
            return (d > c) ? 1 : (d == c) ? 0 : -1;
      return (a > b) ? 1 : -1;
}

static int
sgi_gaps(void) {
      /*
       * returned value is:
       *  = 0 : disk is properly filled to the rim
       *  < 0 : there is an overlap
       *  > 0 : there is still some vacant space
       */
      return verify_sgi(0);
}

int
verify_sgi(int verbose)
{
      int Index[16];          /* list of valid partitions */
      int sortcount = 0;      /* number of used partitions, i.e. non-zero lengths */
      int entire = 0, i = 0;
      unsigned int start = 0;
      long long gap = 0;      /* count unused blocks */
      unsigned int lastblock = sgi_get_lastblock();

      clearfreelist();
      for (i=0; i<16; i++) {
            if (sgi_get_num_sectors(i) != 0) {
                  Index[sortcount++]=i;
                  if (sgi_get_sysid(i) == ENTIRE_DISK) {
                        if (entire++ == 1) {
                              if (verbose)
                                    printf(_("More than one entire disk entry present.\n"));
                        }
                  }
            }
      }
      if (sortcount == 0) {
            if (verbose)
                  printf(_("No partitions defined\n"));
            return (lastblock > 0) ? 1 : (lastblock == 0) ? 0 : -1;
      }
      qsort(Index, sortcount, sizeof(Index[0]), (void*)compare_start);
      if (sgi_get_sysid(Index[0]) == ENTIRE_DISK) {
            if ((Index[0] != 10) && verbose)
                  printf(_("IRIX likes when Partition 11 covers the entire disk.\n"));
            if ((sgi_get_start_sector(Index[0]) != 0) && verbose)
                  printf(_("The entire disk partition should start "
                         "at block 0,\n"
                         "not at diskblock %d.\n"),
                         sgi_get_start_sector(Index[0]));
            if (debug)  /* I do not understand how some disks fulfil it */
                  if ((sgi_get_num_sectors(Index[0]) != lastblock) && verbose)
                        printf(_("The entire disk partition is only %d diskblock large,\n"
                               "but the disk is %d diskblocks long.\n"),
                               sgi_get_num_sectors(Index[0]), lastblock);
            lastblock = sgi_get_num_sectors(Index[0]);
      } else {
            if (verbose)
                  printf(_("One Partition (#11) should cover the entire disk.\n"));
            if (debug>2)
                  printf("sysid=%d\tpartition=%d\n",
                         sgi_get_sysid(Index[0]), Index[0]+1);
      }
      for (i=1, start=0; i<sortcount; i++) {
            int cylsize = sgi_get_nsect() * sgi_get_ntrks();
            if ((sgi_get_start_sector(Index[i]) % cylsize) != 0) {
                  if (debug)  /* I do not understand how some disks fulfil it */
                        if (verbose)
                              printf(_("Partition %d does not start on cylinder boundary.\n"),
                                     Index[i]+1);
            }
            if (sgi_get_num_sectors(Index[i]) % cylsize != 0) {
                  if (debug)  /* I do not understand how some disks fulfil it */
                        if (verbose)
                              printf(_("Partition %d does not end on cylinder boundary.\n"),
                                     Index[i]+1);
            }
            /* We cannot handle several "entire disk" entries. */
            if (sgi_get_sysid(Index[i]) == ENTIRE_DISK) continue;
            if (start > sgi_get_start_sector(Index[i])) {
                  if (verbose)
                        printf(_("The Partition %d and %d overlap by %d sectors.\n"),
                               Index[i-1]+1, Index[i]+1,
                               start - sgi_get_start_sector(Index[i]));
                  if (gap >  0) gap = -gap;
                  if (gap == 0) gap = -1;
            }
            if (start < sgi_get_start_sector(Index[i])) {
                  if (verbose)
                        printf(_("Unused gap of %8u sectors - sectors %8u-%u\n"),
                               sgi_get_start_sector(Index[i]) - start,
                               start, sgi_get_start_sector(Index[i])-1);
                  gap += sgi_get_start_sector(Index[i]) - start;
                  add2freelist(start, sgi_get_start_sector(Index[i]));
            }
            start = sgi_get_start_sector(Index[i])
                  + sgi_get_num_sectors(Index[i]);
            if (debug > 1) {
                  if (verbose)
                        printf("%2d:%12d\t%12d\t%12d\n", Index[i],
                               sgi_get_start_sector(Index[i]),
                               sgi_get_num_sectors(Index[i]),
                               sgi_get_sysid(Index[i]));
            }
      }
      if (start < lastblock) {
            if (verbose)
                  printf(_("Unused gap of %8u sectors - sectors %8u-%u\n"),
                         lastblock - start, start, lastblock-1);
            gap += lastblock - start;
            add2freelist(start, lastblock);
      }
      /*
       * Done with arithmetics
       * Go for details now
       */
      if (verbose) {
            if (!sgi_get_num_sectors(sgi_get_bootpartition())) {
                  printf(_("\nThe boot partition does not exist.\n"));
            }
            if (!sgi_get_num_sectors(sgi_get_swappartition())) {
                  printf(_("\nThe swap partition does not exist.\n"));
            } else {
                  if ((sgi_get_sysid(sgi_get_swappartition()) != SGI_SWAP)
                      &&  (sgi_get_sysid(sgi_get_swappartition()) != LINUX_SWAP))
                        printf(_("\nThe swap partition has no swap type.\n"));
            }
            if (sgi_check_bootfile("/unix"))
                  printf(_("\tYou have chosen an unusual boot file name.\n"));
      }
      return (gap > 0) ? 1 : (gap == 0) ? 0 : -1;
}

void
sgi_change_sysid(int i, int sys)
{
      if (sgi_get_num_sectors(i) == 0) /* caught already before, ... */ {
            printf(_("Sorry You may change the Tag of non-empty partitions.\n"));
            return;
      }
      if (((sys != ENTIRE_DISK) && (sys != SGI_VOLHDR))
          && (sgi_get_start_sector(i)<1)) {
            read_chars(
                  _("It is highly recommended that the partition at offset 0\n"
                    "is of type \"SGI volhdr\", the IRIX system will rely on it to\n"
                    "retrieve from its directory standalone tools like sash and fx.\n"
                    "Only the \"SGI volume\" entire disk section may violate this.\n"
                    "Type YES if you are sure about tagging this partition differently.\n"));
            if (strcmp (line_ptr, _("YES\n")))
                  return;
      }
      sgilabel->partitions[i].id = SSWAP32(sys);
}

/* returns partition index of first entry marked as entire disk */
static int
sgi_entire(void) {
      int i;

      for (i=0; i<16; i++)
            if (sgi_get_sysid(i) == SGI_VOLUME)
                  return i;
      return -1;
}

static void
sgi_set_partition(int i, unsigned int start, unsigned int length, int sys) {
      sgilabel->partitions[i].id = SSWAP32(sys);
      sgilabel->partitions[i].num_sectors = SSWAP32(length);
      sgilabel->partitions[i].start_sector = SSWAP32(start);
      set_changed(i);
      if (sgi_gaps() < 0)     /* rebuild freelist */
            printf(_("Do You know, You got a partition overlap on the disk?\n"));
}

static void
sgi_set_entire(void) {
      int n;

      for (n=10; n<partitions; n++) {
            if (!sgi_get_num_sectors(n)) {
                  sgi_set_partition(n, 0, sgi_get_lastblock(), SGI_VOLUME);
                  break;
            }
      }
}

static
void
sgi_set_volhdr(void)
{
      int n;

      for (n=8; n<partitions; n++) {
            if (!sgi_get_num_sectors(n)) {
                  /*
                   * Choose same default volume header size
                   * as IRIX fx uses.
                   */
                  if (4096 < sgi_get_lastblock())
                        sgi_set_partition(n, 0, 4096, SGI_VOLHDR);
                  break;
            }
      }
}

void
sgi_delete_partition(int i)
{
      sgi_set_partition(i, 0, 0, 0);
}

void
sgi_add_partition(int n, int sys)
{
      char mesg[256];
      unsigned int first=0, last=0;

      if (n == 10) {
            sys = SGI_VOLUME;
      } else if (n == 8) {
            sys = 0;
      }
      if (sgi_get_num_sectors(n)) {
            printf(_("Partition %d is already defined.  Delete "
                   "it before re-adding it.\n"), n + 1);
            return;
      }
      if ((sgi_entire() == -1)
          &&  (sys != SGI_VOLUME)) {
            printf(_("Attempting to generate entire disk entry automatically.\n"));
            sgi_set_entire();
            sgi_set_volhdr();
      }
      if ((sgi_gaps() == 0) &&  (sys != SGI_VOLUME)) {
            printf(_("The entire disk is already covered with partitions.\n"));
            return;
      }
      if (sgi_gaps() < 0) {
            printf(_("You got a partition overlap on the disk. Fix it first!\n"));
            return;
      }
      snprintf(mesg, sizeof(mesg), _("First %s"), str_units(SINGULAR));
      for (;;) {
            if (sys == SGI_VOLUME) {
                  last = sgi_get_lastblock();
                  first = read_int(0, 0, last-1, 0, mesg);
                  if (first != 0) {
                        printf(_("It is highly recommended that eleventh partition\n"
                               "covers the entire disk and is of type `SGI volume'\n"));
                  }
            } else {
                  first = freelist[0].first;
                  last  = freelist[0].last;
                  first = read_int(scround(first), scround(first), scround(last)-1,
                               0, mesg);
            }
            if (display_in_cyl_units)
                  first *= units_per_sector;
            else
                  first = first; /* align to cylinder if you know how ... */
            if (!last)
                  last = isinfreelist(first);
            if (last == 0) {
                  printf(_("You will get a partition overlap on the disk. "
                         "Fix it first!\n"));
            } else
                  break;
      }
      snprintf(mesg, sizeof(mesg), _(" Last %s"), str_units(SINGULAR));
      last = read_int(scround(first), scround(last)-1, scround(last)-1,
                  scround(first), mesg)+1;
      if (display_in_cyl_units)
            last *= units_per_sector;                                     
      else                                                             
            last = last; /* align to cylinder if You know how ... */
      if ((sys == SGI_VOLUME) && (first != 0 || last != sgi_get_lastblock()))
            printf(_("It is highly recommended that eleventh partition\n"
                   "covers the entire disk and is of type `SGI volume'\n"));
      sgi_set_partition(n, first, last-first, sys);
}

void
create_sgilabel(void)
{
      struct hd_geometry geometry;
      struct {
            unsigned int start;
            unsigned int nsect;
            int sysid;
      } old[4];
      int i=0;
      unsigned long long llsectors;
      int res;          /* the result from the ioctl */
      int sec_fac;            /* the sector factor */

      sec_fac = sector_size / 512;  /* determine the sector factor */

      fprintf(stderr,
            _("Building a new SGI disklabel. Changes will remain in memory only,\n"
              "until you decide to write them. After that, of course, the previous\n"
              "content will be unrecoverably lost.\n\n"));

      other_endian = (BYTE_ORDER == LITTLE_ENDIAN);

      res = disksize(fd, &llsectors);

      if (!ioctl(fd, HDIO_GETGEO, &geometry)) {
            heads = geometry.heads;
            sectors = geometry.sectors;
            if (res == 0) {
                  /* the get device size ioctl was successful */
                  unsigned long long llcyls;
                  llcyls = llsectors / (heads * sectors * sec_fac);
                  cylinders = llcyls;
                  if (cylinders != llcyls)      /* truncated? */
                        cylinders = ~0;
            } else {
                  /* otherwise print error and use truncated version */
                  cylinders = geometry.cylinders;
                  fprintf(stderr,
                        _("Warning:  BLKGETSIZE ioctl failed on %s.  "
                          "Using geometry cylinder value of %d.\n"
                          "This value may be truncated for devices"
                          " > 33.8 GB.\n"), disk_device, cylinders);
            }
      }
      for (i = 0; i < 4; i++) {
            old[i].sysid = 0;
            if (valid_part_table_flag(MBRbuffer)) {
                  if (get_part_table(i)->sys_ind) {
                        old[i].sysid = get_part_table(i)->sys_ind;
                        old[i].start = get_start_sect(get_part_table(i));
                        old[i].nsect = get_nr_sects(get_part_table(i));
                        printf(_("Trying to keep parameters of partition %d.\n"), i);
                        if (debug)
                              printf(_("ID=%02x\tSTART=%d\tLENGTH=%d\n"),
                                     old[i].sysid, old[i].start, old[i].nsect);
                  }
            }
      }

      memset(MBRbuffer, 0, sizeof(MBRbuffer));
      sgilabel->magic = SSWAP32(SGI_LABEL_MAGIC);
      sgilabel->boot_part = SSWAP16(0);
      sgilabel->swap_part = SSWAP16(1);

      /* sizeof(sgilabel->boot_file) = 16 > 6 */
      memset(sgilabel->boot_file, 0, 16);
      strcpy(sgilabel->boot_file, "/unix");

      sgilabel->devparam.skew             = (0);
      sgilabel->devparam.gap1             = (0);
      sgilabel->devparam.gap2             = (0);
      sgilabel->devparam.sparecyl               = (0);
      sgilabel->devparam.pcylcount        = SSWAP16(geometry.cylinders);
      sgilabel->devparam.head_vol0        = SSWAP16(0);
      sgilabel->devparam.ntrks                  = SSWAP16(geometry.heads);
      /* tracks/cylinder (heads) */
      sgilabel->devparam.cmd_tag_queue_depth    = (0);
      sgilabel->devparam.unused0                = (0);
      sgilabel->devparam.unused1                = SSWAP16(0);
      sgilabel->devparam.nsect                  = SSWAP16(geometry.sectors);
      /* sectors/track */
      sgilabel->devparam.bytes                  = SSWAP16(sector_size);
      sgilabel->devparam.ilfact                 = SSWAP16(1);
      sgilabel->devparam.flags                  = SSWAP32(TRACK_FWD|\
                                                  IGNORE_ERRORS|RESEEK);
      sgilabel->devparam.datarate               = SSWAP32(0);
      sgilabel->devparam.retries_on_error       = SSWAP32(1);
      sgilabel->devparam.ms_per_word            = SSWAP32(0);
      sgilabel->devparam.xylogics_gap1          = SSWAP16(0);
      sgilabel->devparam.xylogics_syncdelay     = SSWAP16(0);
      sgilabel->devparam.xylogics_readdelay     = SSWAP16(0);
      sgilabel->devparam.xylogics_gap2          = SSWAP16(0);
      sgilabel->devparam.xylogics_readgate      = SSWAP16(0);
      sgilabel->devparam.xylogics_writecont     = SSWAP16(0);
      memset(&(sgilabel->directory), 0, sizeof(struct volume_directory)*15);
      memset(&(sgilabel->partitions), 0, sizeof(struct sgi_partition)*16);
      sgi_label  =  1;
      partitions = 16;
      volumes    = 15;
      sgi_set_entire();
      sgi_set_volhdr();
      for (i = 0; i < 4; i++) {
            if (old[i].sysid) {
                  sgi_set_partition(i, old[i].start, old[i].nsect, old[i].sysid);
            }
      }
}

void
sgi_set_ilfact(void)
{
      /* do nothing in the beginning */
}

void
sgi_set_rspeed(void)
{
      /* do nothing in the beginning */
}

void
sgi_set_pcylcount(void)
{
      /* do nothing in the beginning */
}

void
sgi_set_xcyl(void)
{
      /* do nothing in the beginning */
}

void
sgi_set_ncyl(void)
{
      /* do nothing in the beginning */
}

/* _____________________________________________________________
 */

sgiinfo *
fill_sgiinfo(void)
{
      sgiinfo*info=calloc(1, sizeof(sgiinfo));
      info->magic=SSWAP32(SGI_INFO_MAGIC);
      info->b1=SSWAP32(-1);
      info->b2=SSWAP16(-1);
      info->b3=SSWAP16(1);
      /* You may want to replace this string !!!!!!! */
      strcpy(info->scsi_string, "IBM OEM 0662S12         3 30");
      strcpy(info->serial, "0000");
      info->check1816 = SSWAP16(18*256 +16);
      strcpy(info->installer, "Sfx version 5.3, Oct 18, 1994");
      return info;
}

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