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 #include "sysv68.h" 10 11 /* 12 * Volume ID structure: on first 256-bytes sector of disk 13 */ 14 15 struct volumeid { 16 u8 vid_unused[248]; 17 u8 vid_mac[8]; /* ASCII string "MOTOROLA" */ 18 }; 19 20 /* 21 * config block: second 256-bytes sector on disk 22 */ 23 24 struct dkconfig { 25 u8 ios_unused0[128]; 26 __be32 ios_slcblk; /* Slice table block number */ 27 __be16 ios_slccnt; /* Number of entries in slice table */ 28 u8 ios_unused1[122]; 29 }; 30 31 /* 32 * combined volumeid and dkconfig block 33 */ 34 35 struct dkblk0 { 36 struct volumeid dk_vid; 37 struct dkconfig dk_ios; 38 }; 39 40 /* 41 * Slice Table Structure 42 */ 43 44 struct slice { 45 __be32 nblocks; /* slice size (in blocks) */ 46 __be32 blkoff; /* block offset of slice */ 47 }; 48 49 50 int sysv68_partition(struct parsed_partitions *state) 51 { 52 int i, slices; 53 int slot = 1; 54 Sector sect; 55 unsigned char *data; 56 struct dkblk0 *b; 57 struct slice *slice; 58 char tmp[64]; 59 60 data = read_part_sector(state, 0, §); 61 if (!data) 62 return -1; 63 64 b = (struct dkblk0 *)data; 65 if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) { 66 put_dev_sector(sect); 67 return 0; 68 } 69 slices = be16_to_cpu(b->dk_ios.ios_slccnt); 70 i = be32_to_cpu(b->dk_ios.ios_slcblk); 71 put_dev_sector(sect); 72 73 data = read_part_sector(state, i, §); 74 if (!data) 75 return -1; 76 77 slices -= 1; /* last slice is the whole disk */ 78 snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices); 79 strlcat(state->pp_buf, tmp, PAGE_SIZE); 80 slice = (struct slice *)data; 81 for (i = 0; i < slices; i++, slice++) { 82 if (slot == state->limit) 83 break; 84 if (be32_to_cpu(slice->nblocks)) { 85 put_partition(state, slot, 86 be32_to_cpu(slice->blkoff), 87 be32_to_cpu(slice->nblocks)); 88 snprintf(tmp, sizeof(tmp), "(s%u)", i); 89 strlcat(state->pp_buf, tmp, PAGE_SIZE); 90 } 91 slot++; 92 } 93 strlcat(state->pp_buf, "\n", PAGE_SIZE); 94 put_dev_sector(sect); 95 return 1; 96 } 97