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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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" | |
cbb5cb3b CH |
12 | |
13 | #define SUN_LABEL_MAGIC 0xDABE | |
14 | #define SUN_VTOC_SANITY 0x600DDEEE | |
1da177e4 | 15 | |
0226e9ea CH |
16 | enum { |
17 | SUN_WHOLE_DISK = 5, | |
18 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ | |
19 | }; | |
20 | ||
1493bf21 | 21 | int sun_partition(struct parsed_partitions *state) |
1da177e4 LT |
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 */ | |
3961bae0 MF |
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 */ | |
1da177e4 LT |
47 | __be16 rspeed; /* Disk rotational speed */ |
48 | __be16 pcylcount; /* Physical cylinder count */ | |
49 | __be16 sparecyl; /* extra sects per cylinder */ | |
3961bae0 MF |
50 | __be16 obs1; /* gap1 */ |
51 | __be16 obs2; /* gap2 */ | |
1da177e4 LT |
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 */ | |
3961bae0 MF |
57 | __be16 obs3; /* bhead - Label head offset */ |
58 | __be16 obs4; /* ppart - Physical Partition */ | |
1da177e4 LT |
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 */ | |
3961bae0 | 65 | } * label; |
1da177e4 LT |
66 | struct sun_partition *p; |
67 | unsigned long spc; | |
68 | char b[BDEVNAME_SIZE]; | |
3961bae0 MF |
69 | int use_vtoc; |
70 | int nparts; | |
1da177e4 | 71 | |
1493bf21 | 72 | label = read_part_sector(state, 0, §); |
1da177e4 LT |
73 | if (!label) |
74 | return -1; | |
75 | ||
76 | p = label->partitions; | |
77 | if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) { | |
78 | /* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n", | |
79 | bdevname(bdev, b), be16_to_cpu(label->magic)); */ | |
80 | put_dev_sector(sect); | |
81 | return 0; | |
82 | } | |
83 | /* Look at the checksum */ | |
84 | ush = ((__be16 *) (label+1)) - 1; | |
85 | for (csum = 0; ush >= ((__be16 *) label);) | |
86 | csum ^= *ush--; | |
87 | if (csum) { | |
88 | printk("Dev %s Sun disklabel: Csum bad, label corrupted\n", | |
1493bf21 | 89 | bdevname(state->bdev, b)); |
1da177e4 LT |
90 | put_dev_sector(sect); |
91 | return 0; | |
92 | } | |
93 | ||
3961bae0 MF |
94 | /* Check to see if we can use the VTOC table */ |
95 | use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) && | |
96 | (be32_to_cpu(label->vtoc.version) == 1) && | |
97 | (be16_to_cpu(label->vtoc.nparts) <= 8)); | |
98 | ||
99 | /* Use 8 partition entries if not specified in validated VTOC */ | |
100 | nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8; | |
101 | ||
102 | /* | |
103 | * So that old Linux-Sun partitions continue to work, | |
104 | * alow the VTOC to be used under the additional condition ... | |
105 | */ | |
b1519d04 AV |
106 | use_vtoc = use_vtoc || !(label->vtoc.sanity || |
107 | label->vtoc.version || label->vtoc.nparts); | |
1da177e4 | 108 | spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect); |
3961bae0 | 109 | for (i = 0; i < nparts; i++, p++) { |
1da177e4 | 110 | unsigned long st_sector; |
81a42d29 | 111 | unsigned int num_sectors; |
1da177e4 LT |
112 | |
113 | st_sector = be32_to_cpu(p->start_cylinder) * spc; | |
114 | num_sectors = be32_to_cpu(p->num_sectors); | |
115 | if (num_sectors) { | |
116 | put_partition(state, slot, st_sector, num_sectors); | |
d18d7682 | 117 | state->parts[slot].flags = 0; |
3961bae0 MF |
118 | if (use_vtoc) { |
119 | if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION) | |
120 | state->parts[slot].flags |= ADDPART_FLAG_RAID; | |
121 | else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK) | |
122 | state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK; | |
123 | } | |
1da177e4 LT |
124 | } |
125 | slot++; | |
126 | } | |
9c867fbe | 127 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
128 | put_dev_sector(sect); |
129 | return 1; | |
130 | } |