// SPDX-License-Identifier: GPL-2.0
/*
 *  fs/partitions/osf.c
 *
 *  Code extracted from drivers/block/genhd.c
 *
 *  Copyright (C) 1991-1998  Linus Torvalds
 *  Re-organised Feb 1998 Russell King
 */

#include "check.h"

#define MAX_OSF_PARTITIONS 18
#define DISKLABELMAGIC (0x82564557UL)

int osf_partition(struct parsed_partitions *state)
{
        int i;
        int slot = 1;
        unsigned int npartitions;
        Sector sect;
        unsigned char *data;
        struct disklabel {
                __le32 d_magic;
                __le16 d_type,d_subtype;
                u8 d_typename[16];
                u8 d_packname[16];
                __le32 d_secsize;
                __le32 d_nsectors;
                __le32 d_ntracks;
                __le32 d_ncylinders;
                __le32 d_secpercyl;
                __le32 d_secprtunit;
                __le16 d_sparespertrack;
                __le16 d_sparespercyl;
                __le32 d_acylinders;
                __le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
                __le32 d_headswitch, d_trkseek, d_flags;
                __le32 d_drivedata[5];
                __le32 d_spare[5];
                __le32 d_magic2;
                __le16 d_checksum;
                __le16 d_npartitions;
                __le32 d_bbsize, d_sbsize;
                struct d_partition {
                        __le32 p_size;
                        __le32 p_offset;
                        __le32 p_fsize;
                        u8  p_fstype;
                        u8  p_frag;
                        __le16 p_cpg;
                } d_partitions[MAX_OSF_PARTITIONS];
        } * label;
        struct d_partition * partition;

        data = read_part_sector(state, 0, &sect);
        if (!data)
                return -1;

        label = (struct disklabel *) (data+64);
        partition = label->d_partitions;
        if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
                put_dev_sector(sect);
                return 0;
        }
        if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
                put_dev_sector(sect);
                return 0;
        }
        npartitions = le16_to_cpu(label->d_npartitions);
        if (npartitions > MAX_OSF_PARTITIONS) {
                put_dev_sector(sect);
                return 0;
        }
        for (i = 0 ; i < npartitions; i++, partition++) {
                if (slot == state->limit)
                        break;
                if (le32_to_cpu(partition->p_size))
                        put_partition(state, slot,
                                le32_to_cpu(partition->p_offset),
                                le32_to_cpu(partition->p_size));
                slot++;
        }
        strlcat(state->pp_buf, "\n", PAGE_SIZE);
        put_dev_sector(sect);
        return 1;
}