Commit | Line | Data |
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1da177e4 LT |
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 | unsigned char spare0[14]; | |
23 | struct sun_info { | |
24 | unsigned char spare1; | |
25 | unsigned char id; | |
26 | unsigned char spare2; | |
27 | unsigned char flags; | |
28 | } infos[8]; | |
29 | unsigned char spare[246]; /* Boot information etc. */ | |
30 | __be16 rspeed; /* Disk rotational speed */ | |
31 | __be16 pcylcount; /* Physical cylinder count */ | |
32 | __be16 sparecyl; /* extra sects per cylinder */ | |
33 | unsigned char spare2[4]; /* More magic... */ | |
34 | __be16 ilfact; /* Interleave factor */ | |
35 | __be16 ncyl; /* Data cylinder count */ | |
36 | __be16 nacyl; /* Alt. cylinder count */ | |
37 | __be16 ntrks; /* Tracks per cylinder */ | |
38 | __be16 nsect; /* Sectors per track */ | |
39 | unsigned char spare3[4]; /* Even more magic... */ | |
40 | struct sun_partition { | |
41 | __be32 start_cylinder; | |
42 | __be32 num_sectors; | |
43 | } partitions[8]; | |
44 | __be16 magic; /* Magic number */ | |
45 | __be16 csum; /* Label xor'd checksum */ | |
46 | } * label; | |
47 | struct sun_partition *p; | |
48 | unsigned long spc; | |
49 | char b[BDEVNAME_SIZE]; | |
50 | ||
51 | label = (struct sun_disklabel *)read_dev_sector(bdev, 0, §); | |
52 | if (!label) | |
53 | return -1; | |
54 | ||
55 | p = label->partitions; | |
56 | if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) { | |
57 | /* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n", | |
58 | bdevname(bdev, b), be16_to_cpu(label->magic)); */ | |
59 | put_dev_sector(sect); | |
60 | return 0; | |
61 | } | |
62 | /* Look at the checksum */ | |
63 | ush = ((__be16 *) (label+1)) - 1; | |
64 | for (csum = 0; ush >= ((__be16 *) label);) | |
65 | csum ^= *ush--; | |
66 | if (csum) { | |
67 | printk("Dev %s Sun disklabel: Csum bad, label corrupted\n", | |
68 | bdevname(bdev, b)); | |
69 | put_dev_sector(sect); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | /* All Sun disks have 8 partition entries */ | |
74 | spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect); | |
75 | for (i = 0; i < 8; i++, p++) { | |
76 | unsigned long st_sector; | |
77 | int num_sectors; | |
78 | ||
79 | st_sector = be32_to_cpu(p->start_cylinder) * spc; | |
80 | num_sectors = be32_to_cpu(p->num_sectors); | |
81 | if (num_sectors) { | |
82 | put_partition(state, slot, st_sector, num_sectors); | |
83 | if (label->infos[i].id == LINUX_RAID_PARTITION) | |
84 | state->parts[slot].flags = 1; | |
85 | } | |
86 | slot++; | |
87 | } | |
88 | printk("\n"); | |
89 | put_dev_sector(sect); | |
90 | return 1; | |
91 | } |