1 | // SPDX-License-Identifier: GPL-2.0 |
---|---|
2 | /* |
3 | * fs/partitions/ultrix.c |
4 | * |
5 | * Code extracted from drivers/block/genhd.c |
6 | * |
7 | * Re-organised Jul 1999 Russell King |
8 | */ |
9 | |
10 | #include "check.h" |
11 | |
12 | int ultrix_partition(struct parsed_partitions *state) |
13 | { |
14 | int i; |
15 | Sector sect; |
16 | unsigned char *data; |
17 | struct ultrix_disklabel { |
18 | s32 pt_magic; /* magic no. indicating part. info exits */ |
19 | s32 pt_valid; /* set by driver if pt is current */ |
20 | struct pt_info { |
21 | s32 pi_nblocks; /* no. of sectors */ |
22 | u32 pi_blkoff; /* block offset for start */ |
23 | } pt_part[8]; |
24 | } *label; |
25 | |
26 | #define PT_MAGIC 0x032957 /* Partition magic number */ |
27 | #define PT_VALID 1 /* Indicates if struct is valid */ |
28 | |
29 | data = read_part_sector(state, n: (16384 - sizeof(*label))/512, p: §); |
30 | if (!data) |
31 | return -1; |
32 | |
33 | label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label)); |
34 | |
35 | if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) { |
36 | for (i=0; i<8; i++) |
37 | if (label->pt_part[i].pi_nblocks) |
38 | put_partition(p: state, n: i+1, |
39 | from: label->pt_part[i].pi_blkoff, |
40 | size: label->pt_part[i].pi_nblocks); |
41 | put_dev_sector(p: sect); |
42 | strlcat(p: state->pp_buf, q: "\n", PAGE_SIZE); |
43 | return 1; |
44 | } else { |
45 | put_dev_sector(p: sect); |
46 | return 0; |
47 | } |
48 | } |
49 |