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 11#include "check.h" 12 13#define SUN_LABEL_MAGIC 0xDABE 14#define SUN_VTOC_SANITY 0x600DDEEE 15 16enum { 17 SUN_WHOLE_DISK = 5, 18 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ 19}; 20 21int sun_partition(struct parsed_partitions *state) 22{ 23 int i; 24 __be16 csum; 25 int slot = 1; 26 __be16 *ush; 27 Sector sect; 28 struct sun_disklabel { 29 unsigned char info[128]; /* Informative text string */ 30 struct sun_vtoc { 31 __be32 version; /* Layout version */ 32 char volume[8]; /* Volume name */ 33 __be16 nparts; /* Number of partitions */ 34 struct sun_info { /* Partition hdrs, sec 2 */ 35 __be16 id; 36 __be16 flags; 37 } infos[8]; 38 __be16 padding; /* Alignment padding */ 39 __be32 bootinfo[3]; /* Info needed by mboot */ 40 __be32 sanity; /* To verify vtoc sanity */ 41 __be32 reserved[10]; /* Free space */ 42 __be32 timestamp[8]; /* Partition timestamp */ 43 } vtoc; 44 __be32 write_reinstruct; /* sectors to skip, writes */ 45 __be32 read_reinstruct; /* sectors to skip, reads */ 46 unsigned char spare[148]; /* Padding */ 47 __be16 rspeed; /* Disk rotational speed */ 48 __be16 pcylcount; /* Physical cylinder count */ 49 __be16 sparecyl; /* extra sects per cylinder */ 50 __be16 obs1; /* gap1 */ 51 __be16 obs2; /* gap2 */ 52 __be16 ilfact; /* Interleave factor */ 53 __be16 ncyl; /* Data cylinder count */ 54 __be16 nacyl; /* Alt. cylinder count */ 55 __be16 ntrks; /* Tracks per cylinder */ 56 __be16 nsect; /* Sectors per track */ 57 __be16 obs3; /* bhead - Label head offset */ 58 __be16 obs4; /* ppart - Physical Partition */ 59 struct sun_partition { 60 __be32 start_cylinder; 61 __be32 num_sectors; 62 } partitions[8]; 63 __be16 magic; /* Magic number */ 64 __be16 csum; /* Label xor'd checksum */ 65 } * label; 66 struct sun_partition *p; 67 unsigned long spc; 68 char b[BDEVNAME_SIZE]; 69 int use_vtoc; 70 int nparts; 71 72 label = read_part_sector(state, 0, §); 73 if (!label) 74 return -1; 75 76 p = label->partitions; 77 if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) { 78/* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n", 79 bdevname(bdev, b), be16_to_cpu(label->magic)); */ 80 put_dev_sector(sect); 81 return 0; 82 } 83 /* Look at the checksum */ 84 ush = ((__be16 *) (label+1)) - 1; 85 for (csum = 0; ush >= ((__be16 *) label);) 86 csum ^= *ush--; 87 if (csum) { 88 printk("Dev %s Sun disklabel: Csum bad, label corrupted\n", 89 bdevname(state->bdev, b)); 90 put_dev_sector(sect); 91 return 0; 92 } 93 94 /* Check to see if we can use the VTOC table */ 95 use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) && 96 (be32_to_cpu(label->vtoc.version) == 1) && 97 (be16_to_cpu(label->vtoc.nparts) <= 8)); 98 99 /* Use 8 partition entries if not specified in validated VTOC */ 100 nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8; 101 102 /* 103 * So that old Linux-Sun partitions continue to work, 104 * alow the VTOC to be used under the additional condition ... 105 */ 106 use_vtoc = use_vtoc || !(label->vtoc.sanity || 107 label->vtoc.version || label->vtoc.nparts); 108 spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect); 109 for (i = 0; i < nparts; i++, p++) { 110 unsigned long st_sector; 111 unsigned int num_sectors; 112 113 st_sector = be32_to_cpu(p->start_cylinder) * spc; 114 num_sectors = be32_to_cpu(p->num_sectors); 115 if (num_sectors) { 116 put_partition(state, slot, st_sector, num_sectors); 117 state->parts[slot].flags = 0; 118 if (use_vtoc) { 119 if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION) 120 state->parts[slot].flags |= ADDPART_FLAG_RAID; 121 else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK) 122 state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK; 123 } 124 } 125 slot++; 126 } 127 strlcat(state->pp_buf, "\n", PAGE_SIZE); 128 put_dev_sector(sect); 129 return 1; 130} 131