fs/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 int osf_partition(struct parsed_partitions *state, struct block_device *bdev)
  14 {
  15         int i;
  16         int slot = 1;
  17         Sector sect;
  18         unsigned char *data;
  19         struct disklabel {
  20                 __le32 d_magic;
  21                 __le16 d_type,d_subtype;
  22                 u8 d_typename[16];
  23                 u8 d_packname[16];
  24                 __le32 d_secsize;
  25                 __le32 d_nsectors;
  26                 __le32 d_ntracks;
  27                 __le32 d_ncylinders;
  28                 __le32 d_secpercyl;
  29                 __le32 d_secprtunit;
  30                 __le16 d_sparespertrack;
  31                 __le16 d_sparespercyl;
  32                 __le32 d_acylinders;
  33                 __le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
  34                 __le32 d_headswitch, d_trkseek, d_flags;
  35                 __le32 d_drivedata[5];
  36                 __le32 d_spare[5];
  37                 __le32 d_magic2;
  38                 __le16 d_checksum;
  39                 __le16 d_npartitions;
  40                 __le32 d_bbsize, d_sbsize;
  41                 struct d_partition {
  42                         __le32 p_size;
  43                         __le32 p_offset;
  44                         __le32 p_fsize;
  45                         u8  p_fstype;
  46                         u8  p_frag;
  47                         __le16 p_cpg;
  48                 } d_partitions[8];
  49         } * label;
  50         struct d_partition * partition;
  51
  52         data = read_dev_sector(bdev, 0, &sect);
  53         if (!data)
  54                 return -1;
  55
  56         label = (struct disklabel *) (data+64);
  57         partition = label->d_partitions;
  58         if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
  59                 put_dev_sector(sect);
  60                 return 0;
  61         }
  62         if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
  63                 put_dev_sector(sect);
  64                 return 0;
  65         }
  66         for (i = 0 ; i < le16_to_cpu(label->d_npartitions); i++, partition++) {
  67                 if (slot == state->limit)
  68                         break;
  69                 if (le32_to_cpu(partition->p_size))
  70                         put_partition(state, slot,
  71                                 le32_to_cpu(partition->p_offset),
  72                                 le32_to_cpu(partition->p_size));
  73                 slot++;
  74         }
  75         printk("\n");
  76         put_dev_sector(sect);
  77         return 1;
  78 }