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 <linux/fs.h>
  11 #include <linux/genhd.h>
  12 #include <linux/kernel.h>
  13 #include <linux/major.h>
  14 #include <linux/string.h>
  15 #include <linux/blk.h>
  16
  17 #include "check.h"
  18 #include "osf.h"
  19
  20 int osf_partition(struct gendisk *hd, struct block_device *bdev,
  21                 unsigned long first_sector, int current_minor)
  22 {
  23         int i;
  24         Sector sect;
  25         unsigned char *data;
  26         int mask = (1 << hd->minor_shift) - 1;
  27         struct disklabel {
  28                 u32 d_magic;
  29                 u16 d_type,d_subtype;
  30                 u8 d_typename[16];
  31                 u8 d_packname[16];
  32                 u32 d_secsize;
  33                 u32 d_nsectors;
  34                 u32 d_ntracks;
  35                 u32 d_ncylinders;
  36                 u32 d_secpercyl;
  37                 u32 d_secprtunit;
  38                 u16 d_sparespertrack;
  39                 u16 d_sparespercyl;
  40                 u32 d_acylinders;
  41                 u16 d_rpm, d_interleave, d_trackskew, d_cylskew;
  42                 u32 d_headswitch, d_trkseek, d_flags;
  43                 u32 d_drivedata[5];
  44                 u32 d_spare[5];
  45                 u32 d_magic2;
  46                 u16 d_checksum;
  47                 u16 d_npartitions;
  48                 u32 d_bbsize, d_sbsize;
  49                 struct d_partition {
  50                         u32 p_size;
  51                         u32 p_offset;
  52                         u32 p_fsize;
  53                         u8  p_fstype;
  54                         u8  p_frag;
  55                         u16 p_cpg;
  56                 } d_partitions[8];
  57         } * label;
  58         struct d_partition * partition;
  59
  60         data = read_dev_sector(bdev, 0, &sect);
  61         if (!data)
  62                 return -1;
  63
  64         label = (struct disklabel *) (data+64);
  65         partition = label->d_partitions;
  66         if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
  67                 put_dev_sector(sect);
  68                 return 0;
  69         }
  70         if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
  71                 put_dev_sector(sect);
  72                 return 0;
  73         }
  74         for (i = 0 ; i < le16_to_cpu(label->d_npartitions); i++, partition++) {
  75                 if ((current_minor & mask) == 0)
  76                         break;
  77                 if (le32_to_cpu(partition->p_size))
  78                         add_gd_partition(hd, current_minor,
  79                                 first_sector+le32_to_cpu(partition->p_offset),
  80                                 le32_to_cpu(partition->p_size));
  81                 current_minor++;
  82         }
  83         printk("\n");
  84         put_dev_sector(sect);
  85         return 1;
  86 }
  87