block/partitions/osf.c

   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
  15 int 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 }