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