LXR linux/block/partitions/osf.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  fs/partitions/osf.c
   4 *
   5 *  Code extracted from drivers/block/genhd.c
   6 *
   7 *  Copyright (C) 1991-1998  Linus Torvalds
   8 *  Re-organised Feb 1998 Russell King
   9 */
  10
  11#include "check.h"
  12
  13#define MAX_OSF_PARTITIONS 18
  14#define DISKLABELMAGIC (0x82564557UL)
  15
  16int osf_partition(struct parsed_partitions *state)
  17{
  18        int i;
  19        int slot = 1;
  20        unsigned int npartitions;
  21        Sector sect;
  22        unsigned char *data;
  23        struct disklabel {
  24                __le32 d_magic;
  25                __le16 d_type,d_subtype;
  26                u8 d_typename[16];
  27                u8 d_packname[16];
  28                __le32 d_secsize;
  29                __le32 d_nsectors;
  30                __le32 d_ntracks;
  31                __le32 d_ncylinders;
  32                __le32 d_secpercyl;
  33                __le32 d_secprtunit;
  34                __le16 d_sparespertrack;
  35                __le16 d_sparespercyl;
  36                __le32 d_acylinders;
  37                __le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
  38                __le32 d_headswitch, d_trkseek, d_flags;
  39                __le32 d_drivedata[5];
  40                __le32 d_spare[5];
  41                __le32 d_magic2;
  42                __le16 d_checksum;
  43                __le16 d_npartitions;
  44                __le32 d_bbsize, d_sbsize;
  45                struct d_partition {
  46                        __le32 p_size;
  47                        __le32 p_offset;
  48                        __le32 p_fsize;
  49                        u8  p_fstype;
  50                        u8  p_frag;
  51                        __le16 p_cpg;
  52                } d_partitions[MAX_OSF_PARTITIONS];
  53        } * label;
  54        struct d_partition * partition;
  55
  56        data = read_part_sector(state, 0, &sect);
  57        if (!data)
  58                return -1;
  59
  60        label = (struct disklabel *) (data+64);
  61        partition = label->d_partitions;
  62        if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
  63                put_dev_sector(sect);
  64                return 0;
  65        }
  66        if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
  67                put_dev_sector(sect);
  68                return 0;
  69        }
  70        npartitions = le16_to_cpu(label->d_npartitions);
  71        if (npartitions > MAX_OSF_PARTITIONS) {
  72                put_dev_sector(sect);
  73                return 0;
  74        }
  75        for (i = 0 ; i < npartitions; i++, partition++) {
  76                if (slot == state->limit)
  77                        break;
  78                if (le32_to_cpu(partition->p_size))
  79                        put_partition(state, slot,
  80                                le32_to_cpu(partition->p_offset),
  81                                le32_to_cpu(partition->p_size));
  82                slot++;
  83        }
  84        strlcat(state->pp_buf, "\n", PAGE_SIZE);
  85        put_dev_sector(sect);
  86        return 1;
  87}
  88