sun.c 2.6 KB

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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. #include "check.h"
  10. #include "sun.h"
  11. int sun_partition(struct parsed_partitions *state, struct block_device *bdev)
  12. {
  13. int i;
  14. __be16 csum;
  15. int slot = 1;
  16. __be16 *ush;
  17. Sector sect;
  18. struct sun_disklabel {
  19. unsigned char info[128]; /* Informative text string */
  20. unsigned char spare0[14];
  21. struct sun_info {
  22. unsigned char spare1;
  23. unsigned char id;
  24. unsigned char spare2;
  25. unsigned char flags;
  26. } infos[8];
  27. unsigned char spare[246]; /* Boot information etc. */
  28. __be16 rspeed; /* Disk rotational speed */
  29. __be16 pcylcount; /* Physical cylinder count */
  30. __be16 sparecyl; /* extra sects per cylinder */
  31. unsigned char spare2[4]; /* More magic... */
  32. __be16 ilfact; /* Interleave factor */
  33. __be16 ncyl; /* Data cylinder count */
  34. __be16 nacyl; /* Alt. cylinder count */
  35. __be16 ntrks; /* Tracks per cylinder */
  36. __be16 nsect; /* Sectors per track */
  37. unsigned char spare3[4]; /* Even more magic... */
  38. struct sun_partition {
  39. __be32 start_cylinder;
  40. __be32 num_sectors;
  41. } partitions[8];
  42. __be16 magic; /* Magic number */
  43. __be16 csum; /* Label xor'd checksum */
  44. } * label;
  45. struct sun_partition *p;
  46. unsigned long spc;
  47. char b[BDEVNAME_SIZE];
  48. label = (struct sun_disklabel *)read_dev_sector(bdev, 0, &sect);
  49. if (!label)
  50. return -1;
  51. p = label->partitions;
  52. if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
  53. /* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
  54. bdevname(bdev, b), be16_to_cpu(label->magic)); */
  55. put_dev_sector(sect);
  56. return 0;
  57. }
  58. /* Look at the checksum */
  59. ush = ((__be16 *) (label+1)) - 1;
  60. for (csum = 0; ush >= ((__be16 *) label);)
  61. csum ^= *ush--;
  62. if (csum) {
  63. printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
  64. bdevname(bdev, b));
  65. put_dev_sector(sect);
  66. return 0;
  67. }
  68. /* All Sun disks have 8 partition entries */
  69. spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
  70. for (i = 0; i < 8; i++, p++) {
  71. unsigned long st_sector;
  72. unsigned int num_sectors;
  73. st_sector = be32_to_cpu(p->start_cylinder) * spc;
  74. num_sectors = be32_to_cpu(p->num_sectors);
  75. if (num_sectors) {
  76. put_partition(state, slot, st_sector, num_sectors);
  77. state->parts[slot].flags = 0;
  78. if (label->infos[i].id == LINUX_RAID_PARTITION)
  79. state->parts[slot].flags |= ADDPART_FLAG_RAID;
  80. if (label->infos[i].id == SUN_WHOLE_DISK)
  81. state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
  82. }
  83. slot++;
  84. }
  85. printk("\n");
  86. put_dev_sector(sect);
  87. return 1;
  88. }