/*
* BSD/OSF 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.
*
* Inspired by fdisk, partx, Linux kernel, libparted and openbsd header files.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "partitions.h"
#define BSD_MAXPARTITIONS 16
#define BSD_FS_UNUSED 0
struct bsd_disklabel {
uint32_t d_magic; /* the magic number */
int16_t d_type; /* drive type */
int16_t d_subtype; /* controller/d_type specific */
char d_typename[16]; /* type name, e.g. "eagle" */
char d_packname[16]; /* pack identifier */
/* disk geometry: */
uint32_t d_secsize; /* # of bytes per sector */
uint32_t d_nsectors; /* # of data sectors per track */
uint32_t d_ntracks; /* # of tracks per cylinder */
uint32_t d_ncylinders; /* # of data cylinders per unit */
uint32_t d_secpercyl; /* # of data sectors per cylinder */
uint32_t d_secperunit; /* # of data sectors per unit */
/*
* Spares (bad sector replacements) below
* are not counted in d_nsectors or d_secpercyl.
* Spare sectors are assumed to be physical sectors
* which occupy space at the end of each track and/or cylinder.
*/
uint16_t d_sparespertrack; /* # of spare sectors per track */
uint16_t d_sparespercyl; /* # of spare sectors per cylinder */
/*
* Alternate cylinders include maintenance, replacement,
* configuration description areas, etc.
*/
uint32_t d_acylinders; /* # of alt. cylinders per unit */
/* hardware characteristics: */
/*
* d_interleave, d_trackskew and d_cylskew describe perturbations
* in the media format used to compensate for a slow controller.
* Interleave is physical sector interleave, set up by the formatter
* or controller when formatting. When interleaving is in use,
* logically adjacent sectors are not physically contiguous,
* but instead are separated by some number of sectors.
* It is specified as the ratio of physical sectors traversed
* per logical sector. Thus an interleave of 1:1 implies contiguous
* layout, while 2:1 implies that logical sector 0 is separated
* by one sector from logical sector 1.
* d_trackskew is the offset of sector 0 on track N
* relative to sector 0 on track N-1 on the same cylinder.
* Finally, d_cylskew is the offset of sector 0 on cylinder N
* relative to sector 0 on cylinder N-1.
*/
uint16_t d_rpm; /* rotational speed */
uint16_t d_interleave; /* hardware sector interleave */
uint16_t d_trackskew; /* sector 0 skew, per track */
uint16_t d_cylskew; /* sector 0 skew, per cylinder */
uint32_t d_headswitch; /* head switch time, usec */
uint32_t d_trkseek; /* track-to-track seek, usec */
uint32_t d_flags; /* generic flags */
uint32_t d_drivedata[5]; /* drive-type specific information */
uint32_t d_spare[5]; /* reserved for future use */
uint32_t d_magic2; /* the magic number (again) */
uint16_t d_checksum; /* xor of data incl. partitions */
/* filesystem and partition information: */
uint16_t d_npartitions; /* number of partitions in following */
uint32_t d_bbsize; /* size of boot area at sn0, bytes */
uint32_t d_sbsize; /* max size of fs superblock, bytes */
struct bsd_partition { /* the partition table */
uint32_t p_size; /* number of sectors in partition */
uint32_t p_offset; /* starting sector */
uint32_t p_fsize; /* filesystem basic fragment size */
uint8_t p_fstype; /* filesystem type, see below */
uint8_t p_frag; /* filesystem fragments per block */
uint16_t p_cpg; /* filesystem cylinders per group */
} __attribute__((packed)) d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
} __attribute__((packed));
/* Returns 'blkid_idmag' in 512-sectors */
#define BLKID_MAG_SECTOR(_mag) (((_mag)->kboff * 2) + ((_mag)->sboff >> 9))
/* Returns 'blkid_idmag' in bytes */
#define BLKID_MAG_OFFSET(_mag) ((_mag)->kboff >> 10) + ((_mag)->sboff)
/* Returns 'blkid_idmag' offset in bytes within the last sector */
#define BLKID_MAG_LASTOFFSET(_mag) \
(BLKID_MAG_OFFSET(_mag) - (BLKID_MAG_SECTOR(_mag) << 9))
static int probe_bsd_pt(blkid_probe pr, const struct blkid_idmag *mag)
{
struct bsd_disklabel *l;
struct bsd_partition *p;
const char *name = "bsd" ;
blkid_parttable tab = NULL;
blkid_partition parent;
blkid_partlist ls;
int i, nparts = BSD_MAXPARTITIONS;
unsigned char *data;
if (blkid_partitions_need_typeonly(pr))
/* caller does not ask for details about partitions */
return 0;
data = blkid_probe_get_sector(pr, BLKID_MAG_SECTOR(mag));
if (!data)
goto nothing;
l = (struct bsd_disklabel *) data + BLKID_MAG_LASTOFFSET(mag);
ls = blkid_probe_get_partlist(pr);
if (!ls)
goto err;
/* try to determine the real type of BSD system according to
* (parental) primary partition */
parent = blkid_partlist_get_parent(ls);
if (parent) {
switch(blkid_partition_get_type(parent)) {
case BLKID_FREEBSD_PARTITION:
name = "freebsd";
break;
case BLKID_NETBSD_PARTITION:
name = "netbsd";
break;
case BLKID_OPENBSD_PARTITION:
name = "openbsd";
break;
default:
DBG(DEBUG_LOWPROBE, printf(
"WARNING: BSD label detected on unknown (0x%x) "
"primary partition\n",
blkid_partition_get_type(parent)));
break;
}
}
tab = blkid_partlist_new_parttable(ls, name, BLKID_MAG_OFFSET(mag));
if (!tab)
goto err;
if (le16_to_cpu(l->d_npartitions) < BSD_MAXPARTITIONS)
nparts = le16_to_cpu(l->d_npartitions);
else if (le16_to_cpu(l->d_npartitions) > BSD_MAXPARTITIONS)
DBG(DEBUG_LOWPROBE, printf(
"WARNING: ignore %d more BSD partitions\n",
le16_to_cpu(l->d_npartitions) - BSD_MAXPARTITIONS));
for (i = 0, p = l->d_partitions; i < nparts; i++, p++) {
blkid_partition par;
uint32_t start, size;
/* TODO: in fdisk-mode returns all non-zero (p_size) partitions */
if (p->p_fstype == BSD_FS_UNUSED)
continue;
start = le32_to_cpu(p->p_offset);
size = le32_to_cpu(p->p_size);
if (parent && !blkid_is_nested_dimension(parent, start, size)) {
DBG(DEBUG_LOWPROBE, printf(
"WARNING: BSD partition (%d) overflow "
"detected, ignore\n", i));
continue;
}
par = blkid_partlist_add_partition(ls, tab, start, size);
if (!par)
goto err;
blkid_partition_set_type(par, p->p_fstype);
}
return 0;
nothing:
return 1;
err:
return -1;
}
/*
* All BSD variants use the same magic string (little-endian),
* and the same disklabel.
*
* The difference between {Free,Open,...}BSD is in the (parental)
* primary partition type.
*
* See also: http://en.wikipedia.org/wiki/BSD_disklabel
*
* The location of BSD disk label is architecture specific and in defined by
* LABELSECTOR and LABELOFFSET macros in the disklabel.h file. The location
* also depends on BSD variant, FreeBSD uses only one location, NetBSD and
* OpenBSD are more creative...
*
* The basic overview:
*
* arch | LABELSECTOR | LABELOFFSET
* ------------------------+-------------+------------
* amd64 arm hppa hppa64 | |
* i386, macppc, mvmeppc | 1 | 0
* sgi, aviion, sh, socppc | |
* ------------------------+-------------+------------
* alpha luna88k mac68k | 0 | 64
* sparc(OpenBSD) vax | |
* ------------------------+-------------+------------
* spark64 sparc(NetBSD) | 0 | 128
* ------------------------+-------------+------------
*
* ...and more (see http://fxr.watson.org/fxr/ident?v=NETBSD;i=LABELSECTOR)
*
*/
const struct blkid_idinfo bsd_pt_idinfo =
{
.name = "bsd",
.probefunc = probe_bsd_pt,
.magics =
{
{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 512 },
{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 64 },
{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 128 },
{ NULL }
}
};
