| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | } |