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/*
* uktrix partition parsing code
*
* Copyright (C) 2010 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "partitions.h"
#define ULTRIX_MAXPARTITIONS 8
#define ULTRIX_MAGIC 0x032957
#define ULTRIX_MAGIC_STR "\x02\x29\x57"
/* sector with partition table */
#define ULTRIX_SECTOR ((16384 - sizeof(struct ultrix_disklabel)) >> 9)
/* position of partition table within ULTRIX_SECTOR */
#define ULTRIX_OFFSET (512 - sizeof(struct ultrix_disklabel))
struct ultrix_disklabel {
int32_t pt_magic; /* magic no. indicating part. info exits */
int32_t pt_valid; /* set by driver if pt is current */
struct pt_info {
int32_t pi_nblocks; /* no. of sectors */
uint32_t pi_blkoff; /* block offset for start */
} pt_part[ULTRIX_MAXPARTITIONS];
} __attribute__((packed));
static int probe_ultrix_pt(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
{
unsigned char *data;
struct ultrix_disklabel *l;
blkid_parttable tab = NULL;
blkid_partlist ls;
int i;
data = blkid_probe_get_sector(pr, ULTRIX_SECTOR);
if (!data) {
if (errno)
return -errno;
goto nothing;
}
l = (struct ultrix_disklabel *) (data + ULTRIX_OFFSET);
if (l->pt_magic != ULTRIX_MAGIC || l->pt_valid != 1)
goto nothing;
if (blkid_probe_set_magic(pr, (ULTRIX_SECTOR << 9) + ULTRIX_OFFSET,
sizeof(ULTRIX_MAGIC_STR) - 1,
(unsigned char *) ULTRIX_MAGIC_STR))
goto err;
if (blkid_partitions_need_typeonly(pr))
/* caller does not ask for details about partitions */
return BLKID_PROBE_OK;
ls = blkid_probe_get_partlist(pr);
if (!ls)
goto nothing;
tab = blkid_partlist_new_parttable(ls, "ultrix", 0);
if (!tab)
goto err;
for (i = 0; i < ULTRIX_MAXPARTITIONS; i++) {
if (!l->pt_part[i].pi_nblocks)
blkid_partlist_increment_partno(ls);
else {
if (!blkid_partlist_add_partition(ls, tab,
l->pt_part[i].pi_blkoff,
l->pt_part[i].pi_nblocks))
goto err;
}
}
return BLKID_PROBE_OK;
nothing:
return BLKID_PROBE_NONE;
err:
return -ENOMEM;
}
const struct blkid_idinfo ultrix_pt_idinfo =
{
.name = "ultrix",
.probefunc = probe_ultrix_pt,
.magics = BLKID_NONE_MAGIC
};
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