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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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