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1// SPDX-License-Identifier: GPL-2.02/*3 * fs/partitions/sysv68.c4 *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 disk12 */13 14struct 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 disk21 */22 23struct 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 block32 */33 34struct dkblk0 {35 struct volumeid dk_vid;36 struct dkconfig dk_ios;37};38 39/*40 * Slice Table Structure41 */42 43struct slice {44 __be32 nblocks; /* slice size (in blocks) */45 __be32 blkoff; /* block offset of slice */46};47 48 49int 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