ultrix.c

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/*
 *  fs/partitions/ultrix.c
 *
 *  Code extracted from drivers/block/genhd.c
 *
 *  Re-organised Jul 1999 Russell King
 */

#include "check.h"
#include "ultrix.h"

int ultrix_partition(struct parsed_partitions *state)
{
    int i;
    Sector sect;
    unsigned char *data;
    struct ultrix_disklabel {
        s32 pt_magic;   /* magic no. indicating part. info exits */
        s32 pt_valid;   /* set by driver if pt is current */
        struct  pt_info {
            s32     pi_nblocks; /* no. of sectors */
            u32     pi_blkoff;  /* block offset for start */
        } pt_part[8];
    } *label;

#define PT_MAGIC    0x032957    /* Partition magic number */
#define PT_VALID    1       /* Indicates if struct is valid */

    data = read_part_sector(state, (16384 - sizeof(*label))/512, &sect);
    if (!data)
        return -1;
    
    label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label));

    if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) {
        for (i=0; i<8; i++)
            if (label->pt_part[i].pi_nblocks)
                put_partition(state, i+1, 
                          label->pt_part[i].pi_blkoff,
                          label->pt_part[i].pi_nblocks);
        put_dev_sector(sect);
        strlcat(state->pp_buf, "\n", PAGE_SIZE);
        return 1;
    } else {
        put_dev_sector(sect);
        return 0;
    }
}