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
osf_partition(struct gendisk * hd,struct block_device * bdev,unsigned long first_sector,int current_minor)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, §);
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