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 | |
13 | #define SUN_LABEL_MAGIC 0xDABE |
14 | #define SUN_VTOC_SANITY 0x600DDEEE |
15 | |
16 | enum { |
17 | SUN_WHOLE_DISK = 5, |
18 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
19 | }; |
20 | |
21 | int sun_partition(struct parsed_partitions *state) |
22 | { |
23 | int i; |
24 | __be16 csum; |
25 | int slot = 1; |
26 | __be16 *ush; |
27 | Sector sect; |
28 | struct sun_disklabel { |
29 | unsigned char info[128]; /* Informative text string */ |
30 | struct sun_vtoc { |
31 | __be32 version; /* Layout version */ |
32 | char volume[8]; /* Volume name */ |
33 | __be16 nparts; /* Number of partitions */ |
34 | struct sun_info { /* Partition hdrs, sec 2 */ |
35 | __be16 id; |
36 | __be16 flags; |
37 | } infos[8]; |
38 | __be16 padding; /* Alignment padding */ |
39 | __be32 bootinfo[3]; /* Info needed by mboot */ |
40 | __be32 sanity; /* To verify vtoc sanity */ |
41 | __be32 reserved[10]; /* Free space */ |
42 | __be32 timestamp[8]; /* Partition timestamp */ |
43 | } vtoc; |
44 | __be32 write_reinstruct; /* sectors to skip, writes */ |
45 | __be32 read_reinstruct; /* sectors to skip, reads */ |
46 | unsigned char spare[148]; /* Padding */ |
47 | __be16 rspeed; /* Disk rotational speed */ |
48 | __be16 pcylcount; /* Physical cylinder count */ |
49 | __be16 sparecyl; /* extra sects per cylinder */ |
50 | __be16 obs1; /* gap1 */ |
51 | __be16 obs2; /* gap2 */ |
52 | __be16 ilfact; /* Interleave factor */ |
53 | __be16 ncyl; /* Data cylinder count */ |
54 | __be16 nacyl; /* Alt. cylinder count */ |
55 | __be16 ntrks; /* Tracks per cylinder */ |
56 | __be16 nsect; /* Sectors per track */ |
57 | __be16 obs3; /* bhead - Label head offset */ |
58 | __be16 obs4; /* ppart - Physical Partition */ |
59 | struct sun_partition { |
60 | __be32 start_cylinder; |
61 | __be32 num_sectors; |
62 | } partitions[8]; |
63 | __be16 magic; /* Magic number */ |
64 | __be16 csum; /* Label xor'd checksum */ |
65 | } * label; |
66 | struct sun_partition *p; |
67 | unsigned long spc; |
68 | int use_vtoc; |
69 | int nparts; |
70 | |
71 | label = read_part_sector(state, n: 0, p: §); |
72 | if (!label) |
73 | return -1; |
74 | |
75 | p = label->partitions; |
76 | if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) { |
77 | /* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n", |
78 | state->disk->disk_name, be16_to_cpu(label->magic)); */ |
79 | put_dev_sector(p: sect); |
80 | return 0; |
81 | } |
82 | /* Look at the checksum */ |
83 | ush = ((__be16 *) (label+1)) - 1; |
84 | for (csum = 0; ush >= ((__be16 *) label);) |
85 | csum ^= *ush--; |
86 | if (csum) { |
87 | printk("Dev %s Sun disklabel: Csum bad, label corrupted\n" , |
88 | state->disk->disk_name); |
89 | put_dev_sector(p: sect); |
90 | return 0; |
91 | } |
92 | |
93 | /* Check to see if we can use the VTOC table */ |
94 | use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) && |
95 | (be32_to_cpu(label->vtoc.version) == 1) && |
96 | (be16_to_cpu(label->vtoc.nparts) <= 8)); |
97 | |
98 | /* Use 8 partition entries if not specified in validated VTOC */ |
99 | nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8; |
100 | |
101 | /* |
102 | * So that old Linux-Sun partitions continue to work, |
103 | * alow the VTOC to be used under the additional condition ... |
104 | */ |
105 | use_vtoc = use_vtoc || !(label->vtoc.sanity || |
106 | label->vtoc.version || label->vtoc.nparts); |
107 | spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect); |
108 | for (i = 0; i < nparts; i++, p++) { |
109 | unsigned long st_sector; |
110 | unsigned int num_sectors; |
111 | |
112 | st_sector = be32_to_cpu(p->start_cylinder) * spc; |
113 | num_sectors = be32_to_cpu(p->num_sectors); |
114 | if (num_sectors) { |
115 | put_partition(p: state, n: slot, from: st_sector, size: num_sectors); |
116 | state->parts[slot].flags = 0; |
117 | if (use_vtoc) { |
118 | if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION) |
119 | state->parts[slot].flags |= ADDPART_FLAG_RAID; |
120 | else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK) |
121 | state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK; |
122 | } |
123 | } |
124 | slot++; |
125 | } |
126 | strlcat(p: state->pp_buf, q: "\n" , PAGE_SIZE); |
127 | put_dev_sector(p: sect); |
128 | return 1; |
129 | } |
130 | |