LXR linux-old/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
  20int 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
  88