sun.c 3.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * fs/partitions/sun.c
  4. *
  5. * Code extracted from drivers/block/genhd.c
  6. *
  7. * Copyright (C) 1991-1998 Linus Torvalds
  8. * Re-organised Feb 1998 Russell King
  9. */
  10. #include "check.h"
  11. #define SUN_LABEL_MAGIC 0xDABE
  12. #define SUN_VTOC_SANITY 0x600DDEEE
  13. enum {
  14. SUN_WHOLE_DISK = 5,
  15. LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
  16. };
  17. int sun_partition(struct parsed_partitions *state)
  18. {
  19. int i;
  20. __be16 csum;
  21. int slot = 1;
  22. __be16 *ush;
  23. Sector sect;
  24. struct sun_disklabel {
  25. unsigned char info[128]; /* Informative text string */
  26. struct sun_vtoc {
  27. __be32 version; /* Layout version */
  28. char volume[8]; /* Volume name */
  29. __be16 nparts; /* Number of partitions */
  30. struct sun_info { /* Partition hdrs, sec 2 */
  31. __be16 id;
  32. __be16 flags;
  33. } infos[8];
  34. __be16 padding; /* Alignment padding */
  35. __be32 bootinfo[3]; /* Info needed by mboot */
  36. __be32 sanity; /* To verify vtoc sanity */
  37. __be32 reserved[10]; /* Free space */
  38. __be32 timestamp[8]; /* Partition timestamp */
  39. } vtoc;
  40. __be32 write_reinstruct; /* sectors to skip, writes */
  41. __be32 read_reinstruct; /* sectors to skip, reads */
  42. unsigned char spare[148]; /* Padding */
  43. __be16 rspeed; /* Disk rotational speed */
  44. __be16 pcylcount; /* Physical cylinder count */
  45. __be16 sparecyl; /* extra sects per cylinder */
  46. __be16 obs1; /* gap1 */
  47. __be16 obs2; /* gap2 */
  48. __be16 ilfact; /* Interleave factor */
  49. __be16 ncyl; /* Data cylinder count */
  50. __be16 nacyl; /* Alt. cylinder count */
  51. __be16 ntrks; /* Tracks per cylinder */
  52. __be16 nsect; /* Sectors per track */
  53. __be16 obs3; /* bhead - Label head offset */
  54. __be16 obs4; /* ppart - Physical Partition */
  55. struct sun_partition {
  56. __be32 start_cylinder;
  57. __be32 num_sectors;
  58. } partitions[8];
  59. __be16 magic; /* Magic number */
  60. __be16 csum; /* Label xor'd checksum */
  61. } * label;
  62. struct sun_partition *p;
  63. unsigned long spc;
  64. char b[BDEVNAME_SIZE];
  65. int use_vtoc;
  66. int nparts;
  67. label = read_part_sector(state, 0, &sect);
  68. if (!label)
  69. return -1;
  70. p = label->partitions;
  71. if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
  72. /* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
  73. bdevname(bdev, b), be16_to_cpu(label->magic)); */
  74. put_dev_sector(sect);
  75. return 0;
  76. }
  77. /* Look at the checksum */
  78. ush = ((__be16 *) (label+1)) - 1;
  79. for (csum = 0; ush >= ((__be16 *) label);)
  80. csum ^= *ush--;
  81. if (csum) {
  82. printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
  83. bdevname(state->bdev, b));
  84. put_dev_sector(sect);
  85. return 0;
  86. }
  87. /* Check to see if we can use the VTOC table */
  88. use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
  89. (be32_to_cpu(label->vtoc.version) == 1) &&
  90. (be16_to_cpu(label->vtoc.nparts) <= 8));
  91. /* Use 8 partition entries if not specified in validated VTOC */
  92. nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
  93. /*
  94. * So that old Linux-Sun partitions continue to work,
  95. * alow the VTOC to be used under the additional condition ...
  96. */
  97. use_vtoc = use_vtoc || !(label->vtoc.sanity ||
  98. label->vtoc.version || label->vtoc.nparts);
  99. spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
  100. for (i = 0; i < nparts; i++, p++) {
  101. unsigned long st_sector;
  102. unsigned int num_sectors;
  103. st_sector = be32_to_cpu(p->start_cylinder) * spc;
  104. num_sectors = be32_to_cpu(p->num_sectors);
  105. if (num_sectors) {
  106. put_partition(state, slot, st_sector, num_sectors);
  107. state->parts[slot].flags = 0;
  108. if (use_vtoc) {
  109. if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
  110. state->parts[slot].flags |= ADDPART_FLAG_RAID;
  111. else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
  112. state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
  113. }
  114. }
  115. slot++;
  116. }
  117. strlcat(state->pp_buf, "\n", PAGE_SIZE);
  118. put_dev_sector(sect);
  119. return 1;
  120. }