linux/block/partitions/osf.c
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   1/*
   2 *  fs/partitions/osf.c
   3 *
   4 *  Code extracted from drivers/block/genhd.c
   5 *
   6 *  Copyright (C) 1991-1998  Linus Torvalds
   7 *  Re-organised Feb 1998 Russell King
   8 */
   9
  10#include "check.h"
  11#include "osf.h"
  12
  13#define MAX_OSF_PARTITIONS 18
  14
  15int osf_partition(struct parsed_partitions *state)
  16{
  17        int i;
  18        int slot = 1;
  19        unsigned int npartitions;
  20        Sector sect;
  21        unsigned char *data;
  22        struct disklabel {
  23                __le32 d_magic;
  24                __le16 d_type,d_subtype;
  25                u8 d_typename[16];
  26                u8 d_packname[16];
  27                __le32 d_secsize;
  28                __le32 d_nsectors;
  29                __le32 d_ntracks;
  30                __le32 d_ncylinders;
  31                __le32 d_secpercyl;
  32                __le32 d_secprtunit;
  33                __le16 d_sparespertrack;
  34                __le16 d_sparespercyl;
  35                __le32 d_acylinders;
  36                __le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
  37                __le32 d_headswitch, d_trkseek, d_flags;
  38                __le32 d_drivedata[5];
  39                __le32 d_spare[5];
  40                __le32 d_magic2;
  41                __le16 d_checksum;
  42                __le16 d_npartitions;
  43                __le32 d_bbsize, d_sbsize;
  44                struct d_partition {
  45                        __le32 p_size;
  46                        __le32 p_offset;
  47                        __le32 p_fsize;
  48                        u8  p_fstype;
  49                        u8  p_frag;
  50                        __le16 p_cpg;
  51                } d_partitions[MAX_OSF_PARTITIONS];
  52        } * label;
  53        struct d_partition * partition;
  54
  55        data = read_part_sector(state, 0, &sect);
  56        if (!data)
  57                return -1;
  58
  59        label = (struct disklabel *) (data+64);
  60        partition = label->d_partitions;
  61        if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
  62                put_dev_sector(sect);
  63                return 0;
  64        }
  65        if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
  66                put_dev_sector(sect);
  67                return 0;
  68        }
  69        npartitions = le16_to_cpu(label->d_npartitions);
  70        if (npartitions > MAX_OSF_PARTITIONS) {
  71                put_dev_sector(sect);
  72                return 0;
  73        }
  74        for (i = 0 ; i < npartitions; i++, partition++) {
  75                if (slot == state->limit)
  76                        break;
  77                if (le32_to_cpu(partition->p_size))
  78                        put_partition(state, slot,
  79                                le32_to_cpu(partition->p_offset),
  80                                le32_to_cpu(partition->p_size));
  81                slot++;
  82        }
  83        strlcat(state->pp_buf, "\n", PAGE_SIZE);
  84        put_dev_sector(sect);
  85        return 1;
  86}
  87
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