1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * fs/partitions/sysv68.c
4 *
5 * Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
6 */
7
8 #include "check.h"
9
10 /*
11 * Volume ID structure: on first 256-bytes sector of disk
12 */
13
14 struct volumeid {
15 u8 vid_unused[248];
16 u8 vid_mac[8]; /* ASCII string "MOTOROLA" */
17 };
18
19 /*
20 * config block: second 256-bytes sector on disk
21 */
22
23 struct dkconfig {
24 u8 ios_unused0[128];
25 __be32 ios_slcblk; /* Slice table block number */
26 __be16 ios_slccnt; /* Number of entries in slice table */
27 u8 ios_unused1[122];
28 };
29
30 /*
31 * combined volumeid and dkconfig block
32 */
33
34 struct dkblk0 {
35 struct volumeid dk_vid;
36 struct dkconfig dk_ios;
37 };
38
39 /*
40 * Slice Table Structure
41 */
42
43 struct slice {
44 __be32 nblocks; /* slice size (in blocks) */
45 __be32 blkoff; /* block offset of slice */
46 };
47
48
sysv68_partition(struct parsed_partitions * state)49 int sysv68_partition(struct parsed_partitions *state)
50 {
51 int i, slices;
52 int slot = 1;
53 Sector sect;
54 unsigned char *data;
55 struct dkblk0 *b;
56 struct slice *slice;
57 char tmp[64];
58
59 data = read_part_sector(state, 0, §);
60 if (!data)
61 return -1;
62
63 b = (struct dkblk0 *)data;
64 if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
65 put_dev_sector(sect);
66 return 0;
67 }
68 slices = be16_to_cpu(b->dk_ios.ios_slccnt);
69 i = be32_to_cpu(b->dk_ios.ios_slcblk);
70 put_dev_sector(sect);
71
72 data = read_part_sector(state, i, §);
73 if (!data)
74 return -1;
75
76 slices -= 1; /* last slice is the whole disk */
77 snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices);
78 strlcat(state->pp_buf, tmp, PAGE_SIZE);
79 slice = (struct slice *)data;
80 for (i = 0; i < slices; i++, slice++) {
81 if (slot == state->limit)
82 break;
83 if (be32_to_cpu(slice->nblocks)) {
84 put_partition(state, slot,
85 be32_to_cpu(slice->blkoff),
86 be32_to_cpu(slice->nblocks));
87 snprintf(tmp, sizeof(tmp), "(s%u)", i);
88 strlcat(state->pp_buf, tmp, PAGE_SIZE);
89 }
90 slot++;
91 }
92 strlcat(state->pp_buf, "\n", PAGE_SIZE);
93 put_dev_sector(sect);
94 return 1;
95 }
96