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brintos / linux-shallow public Read only

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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, &sect);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, &sect);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