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util-linux/libblkid/src/partitions/sun.c

125 lines
2.9 KiB

/*
* sun (solaris-sparc) partition parsing code
*
* Copyright (C) 2009 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 <stddef.h>
#include "pt-sun.h"
#include "partitions.h"
static int probe_sun_pt(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
{
struct sun_disklabel *l;
struct sun_partition *p;
blkid_parttable tab = NULL;
blkid_partlist ls;
uint16_t nparts;
uint64_t spc;
int i, use_vtoc;
l = (struct sun_disklabel *) blkid_probe_get_sector(pr, 0);
if (!l) {
if (errno)
return -errno;
goto nothing;
}
if (sun_pt_checksum(l)) {
DBG(LOWPROBE, ul_debug(
"detected corrupted sun disk label -- ignore"));
goto nothing;
}
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, "sun", 0);
if (!tab)
goto err;
/* sectors per cylinder (partition offset is in cylinders...) */
spc = be16_to_cpu(l->nhead) * be16_to_cpu(l->nsect);
DBG(LOWPROBE, ul_debug("Sun VTOC sanity=%u version=%u nparts=%u",
be32_to_cpu(l->vtoc.sanity),
be32_to_cpu(l->vtoc.version),
be16_to_cpu(l->vtoc.nparts)));
/* Check to see if we can use the VTOC table */
use_vtoc = ((be32_to_cpu(l->vtoc.sanity) == SUN_VTOC_SANITY) &&
(be32_to_cpu(l->vtoc.version) == SUN_VTOC_VERSION) &&
(be16_to_cpu(l->vtoc.nparts) <= SUN_MAXPARTITIONS));
/* Use 8 partition entries if not specified in validated VTOC */
nparts = use_vtoc ? be16_to_cpu(l->vtoc.nparts) : SUN_MAXPARTITIONS;
/*
* So that old Linux-Sun partitions continue to work,
* allow the VTOC to be used under the additional condition ...
*/
use_vtoc = use_vtoc || !(l->vtoc.sanity || l->vtoc.version || l->vtoc.nparts);
for (i = 0, p = l->partitions; i < nparts; i++, p++) {
uint64_t start, size;
uint16_t type = 0, flags = 0;
blkid_partition par;
start = be32_to_cpu(p->start_cylinder) * spc;
size = be32_to_cpu(p->num_sectors);
if (use_vtoc) {
type = be16_to_cpu(l->vtoc.infos[i].id);
flags = be16_to_cpu(l->vtoc.infos[i].flags);
}
if (type == SUN_TAG_WHOLEDISK || !size) {
blkid_partlist_increment_partno(ls);
continue;
}
par = blkid_partlist_add_partition(ls, tab, start, size);
if (!par)
goto err;
if (type)
blkid_partition_set_type(par, type);
if (flags)
blkid_partition_set_flags(par, flags);
}
return BLKID_PROBE_OK;
nothing:
return BLKID_PROBE_NONE;
err:
return -ENOMEM;
}
const struct blkid_idinfo sun_pt_idinfo =
{
.name = "sun",
.probefunc = probe_sun_pt,
.magics =
{
{
.magic = "\xDA\xBE", /* big-endian magic string */
.len = 2,
.sboff = offsetof(struct sun_disklabel, magic)
},
{ NULL }
}
};