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