1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/partitions/sysv68.c 4 * 5 * Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be> 6 */ 7 8 #include "check.h" 9 10 /* 11 * Volume ID structure: on first 256-bytes sector of disk 12 */ 13 14 struct volumeid { 15 u8 vid_unused[248]; 16 u8 vid_mac[8]; /* ASCII string "MOTOROLA" */ 17 }; 18 19 /* 20 * config block: second 256-bytes sector on disk 21 */ 22 23 struct dkconfig { 24 u8 ios_unused0[128]; 25 __be32 ios_slcblk; /* Slice table block number */ 26 __be16 ios_slccnt; /* Number of entries in slice table */ 27 u8 ios_unused1[122]; 28 }; 29 30 /* 31 * combined volumeid and dkconfig block 32 */ 33 34 struct dkblk0 { 35 struct volumeid dk_vid; 36 struct dkconfig dk_ios; 37 }; 38 39 /* 40 * Slice Table Structure 41 */ 42 43 struct slice { 44 __be32 nblocks; /* slice size (in blocks) */ 45 __be32 blkoff; /* block offset of slice */ 46 }; 47 48 49 int sysv68_partition(struct parsed_partitions *state) 50 { 51 int i, slices; 52 int slot = 1; 53 Sector sect; 54 unsigned char *data; 55 struct dkblk0 *b; 56 struct slice *slice; 57 char tmp[64]; 58 59 data = read_part_sector(state, 0, §); 60 if (!data) 61 return -1; 62 63 b = (struct dkblk0 *)data; 64 if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) { 65 put_dev_sector(sect); 66 return 0; 67 } 68 slices = be16_to_cpu(b->dk_ios.ios_slccnt); 69 i = be32_to_cpu(b->dk_ios.ios_slcblk); 70 put_dev_sector(sect); 71 72 data = read_part_sector(state, i, §); 73 if (!data) 74 return -1; 75 76 slices -= 1; /* last slice is the whole disk */ 77 snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices); 78 strlcat(state->pp_buf, tmp, PAGE_SIZE); 79 slice = (struct slice *)data; 80 for (i = 0; i < slices; i++, slice++) { 81 if (slot == state->limit) 82 break; 83 if (be32_to_cpu(slice->nblocks)) { 84 put_partition(state, slot, 85 be32_to_cpu(slice->blkoff), 86 be32_to_cpu(slice->nblocks)); 87 snprintf(tmp, sizeof(tmp), "(s%u)", i); 88 strlcat(state->pp_buf, tmp, PAGE_SIZE); 89 } 90 slot++; 91 } 92 strlcat(state->pp_buf, "\n", PAGE_SIZE); 93 put_dev_sector(sect); 94 return 1; 95 } 96