osf.c

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/*
 *  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"
#include "osf.h"

#define MAX_OSF_PARTITIONS 18

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;
}