1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * fs/partitions/sun.c
4 *
5 * Code extracted from drivers/block/genhd.c
6 *
7 * Copyright (C) 1991-1998 Linus Torvalds
8 * Re-organised Feb 1998 Russell King
9 */
10
11 #include "check.h"
12 #include "sun.h"
13
14 int sun_partition(struct parsed_partitions *state)
15 {
16 int i;
17 __be16 csum;
18 int slot = 1;
19 __be16 *ush;
20 Sector sect;
21 struct sun_disklabel {
22 unsigned char info[128]; /* Informative text string */
23 struct sun_vtoc {
24 __be32 version; /* Layout version */
25 char volume[8]; /* Volume name */
26 __be16 nparts; /* Number of partitions */
27 struct sun_info { /* Partition hdrs, sec 2 */
28 __be16 id;
29 __be16 flags;
30 } infos[8];
31 __be16 padding; /* Alignment padding */
32 __be32 bootinfo[3]; /* Info needed by mboot */
33 __be32 sanity; /* To verify vtoc sanity */
34 __be32 reserved[10]; /* Free space */
35 __be32 timestamp[8]; /* Partition timestamp */
36 } vtoc;
37 __be32 write_reinstruct; /* sectors to skip, writes */
38 __be32 read_reinstruct; /* sectors to skip, reads */
39 unsigned char spare[148]; /* Padding */
40 __be16 rspeed; /* Disk rotational speed */
41 __be16 pcylcount; /* Physical cylinder count */
42 __be16 sparecyl; /* extra sects per cylinder */
43 __be16 obs1; /* gap1 */
44 __be16 obs2; /* gap2 */
45 __be16 ilfact; /* Interleave factor */
46 __be16 ncyl; /* Data cylinder count */
47 __be16 nacyl; /* Alt. cylinder count */
48 __be16 ntrks; /* Tracks per cylinder */
49 __be16 nsect; /* Sectors per track */
50 __be16 obs3; /* bhead - Label head offset */
51 __be16 obs4; /* ppart - Physical Partition */
52 struct sun_partition {
53 __be32 start_cylinder;
54 __be32 num_sectors;
55 } partitions[8];
56 __be16 magic; /* Magic number */
57 __be16 csum; /* Label xor'd checksum */
58 } * label;
59 struct sun_partition *p;
60 unsigned long spc;
61 char b[BDEVNAME_SIZE];
62 int use_vtoc;
63 int nparts;
64
65 label = read_part_sector(state, 0, §);
66 if (!label)
67 return -1;
68
69 p = label->partitions;
70 if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
71 /* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
72 bdevname(bdev, b), be16_to_cpu(label->magic)); */
73 put_dev_sector(sect);
74 return 0;
75 }
76 /* Look at the checksum */
77 ush = ((__be16 *) (label+1)) - 1;
78 for (csum = 0; ush >= ((__be16 *) label);)
79 csum ^= *ush--;
80 if (csum) {
81 printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
82 bdevname(state->bdev, b));
83 put_dev_sector(sect);
84 return 0;
85 }
86
87 /* Check to see if we can use the VTOC table */
88 use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
89 (be32_to_cpu(label->vtoc.version) == 1) &&
90 (be16_to_cpu(label->vtoc.nparts) <= 8));
91
92 /* Use 8 partition entries if not specified in validated VTOC */
93 nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
94
95 /*
96 * So that old Linux-Sun partitions continue to work,
97 * alow the VTOC to be used under the additional condition ...
98 */
99 use_vtoc = use_vtoc || !(label->vtoc.sanity ||
100 label->vtoc.version || label->vtoc.nparts);
101 spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
102 for (i = 0; i < nparts; i++, p++) {
103 unsigned long st_sector;
104 unsigned int num_sectors;
105
106 st_sector = be32_to_cpu(p->start_cylinder) * spc;
107 num_sectors = be32_to_cpu(p->num_sectors);
108 if (num_sectors) {
109 put_partition(state, slot, st_sector, num_sectors);
110 state->parts[slot].flags = 0;
111 if (use_vtoc) {
112 if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
113 state->parts[slot].flags |= ADDPART_FLAG_RAID;
114 else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
115 state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
116 }
117 }
118 slot++;
119 }
120 strlcat(state->pp_buf, "\n", PAGE_SIZE);
121 put_dev_sector(sect);
122 return 1;
123 }