block/partitions/ultrix.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  fs/partitions/ultrix.c
   4  *
   5  *  Code extracted from drivers/block/genhd.c
   6  *
   7  *  Re-organised Jul 1999 Russell King
   8  */
   9
  10 #include "check.h"
  11 #include "ultrix.h"
  12
  13 int ultrix_partition(struct parsed_partitions *state)
  14 {
  15         int i;
  16         Sector sect;
  17         unsigned char *data;
  18         struct ultrix_disklabel {
  19                 s32     pt_magic;       /* magic no. indicating part. info exits */
  20                 s32     pt_valid;       /* set by driver if pt is current */
  21                 struct  pt_info {
  22                         s32             pi_nblocks; /* no. of sectors */
  23                         u32             pi_blkoff;  /* block offset for start */
  24                 } pt_part[8];
  25         } *label;
  26
  27 #define PT_MAGIC        0x032957        /* Partition magic number */
  28 #define PT_VALID        1               /* Indicates if struct is valid */
  29
  30         data = read_part_sector(state, (16384 - sizeof(*label))/512, &sect);
  31         if (!data)
  32                 return -1;
  33
  34         label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label));
  35
  36         if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) {
  37                 for (i=0; i<8; i++)
  38                         if (label->pt_part[i].pi_nblocks)
  39                                 put_partition(state, i+1,
  40                                               label->pt_part[i].pi_blkoff,
  41                                               label->pt_part[i].pi_nblocks);
  42                 put_dev_sector(sect);
  43                 strlcat(state->pp_buf, "\n", PAGE_SIZE);
  44                 return 1;
  45         } else {
  46                 put_dev_sector(sect);
  47                 return 0;
  48         }
  49 }