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
  16 int 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 }