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1// SPDX-License-Identifier: GPL-2.02/*3 * fs/partitions/osf.c4 *5 * Code extracted from drivers/block/genhd.c6 *7 * Copyright (C) 1991-1998 Linus Torvalds8 * Re-organised Feb 1998 Russell King9 */10 11#include "check.h"12 13#define MAX_OSF_PARTITIONS 1814#define DISKLABELMAGIC (0x82564557UL)15 16int osf_partition(struct parsed_partitions *state)17{18 int i;19 int slot = 1;20 unsigned int npartitions;21 Sector sect;22 unsigned char *data;23 struct disklabel {24 __le32 d_magic;25 __le16 d_type,d_subtype;26 u8 d_typename[16];27 u8 d_packname[16];28 __le32 d_secsize;29 __le32 d_nsectors;30 __le32 d_ntracks;31 __le32 d_ncylinders;32 __le32 d_secpercyl;33 __le32 d_secprtunit;34 __le16 d_sparespertrack;35 __le16 d_sparespercyl;36 __le32 d_acylinders;37 __le16 d_rpm, d_interleave, d_trackskew, d_cylskew;38 __le32 d_headswitch, d_trkseek, d_flags;39 __le32 d_drivedata[5];40 __le32 d_spare[5];41 __le32 d_magic2;42 __le16 d_checksum;43 __le16 d_npartitions;44 __le32 d_bbsize, d_sbsize;45 struct d_partition {46 __le32 p_size;47 __le32 p_offset;48 __le32 p_fsize;49 u8 p_fstype;50 u8 p_frag;51 __le16 p_cpg;52 } d_partitions[MAX_OSF_PARTITIONS];53 } * label;54 struct d_partition * partition;55 56 data = read_part_sector(state, 0, §);57 if (!data)58 return -1;59 60 label = (struct disklabel *) (data+64);61 partition = label->d_partitions;62 if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {63 put_dev_sector(sect);64 return 0;65 }66 if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {67 put_dev_sector(sect);68 return 0;69 }70 npartitions = le16_to_cpu(label->d_npartitions);71 if (npartitions > MAX_OSF_PARTITIONS) {72 put_dev_sector(sect);73 return 0;74 }75 for (i = 0 ; i < npartitions; i++, partition++) {76 if (slot == state->limit)77 break;78 if (le32_to_cpu(partition->p_size))79 put_partition(state, slot,80 le32_to_cpu(partition->p_offset),81 le32_to_cpu(partition->p_size));82 slot++;83 }84 strlcat(state->pp_buf, "\n", PAGE_SIZE);85 put_dev_sector(sect);86 return 1;87}88