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) 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 = read_part_sector(state, 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(state->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 strlcat(state->pp_buf, "\n", PAGE_SIZE); 120 put_dev_sector(sect); 121 return 1; 122 } 123