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

197 lines
5.8 KiB

/*
* unixware 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.
*
*
* The interesting information about unixware PT:
* - Linux kernel / partx
* - vtoc(7) SCO UNIX command man page
* - evms source code (http://evms.sourceforge.net/)
* - vxtools source code (http://martin.hinner.info/fs/vxfs/)
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "partitions.h"
/* disklabel location */
#define UNIXWARE_SECTOR 29
#define UNIXWARE_OFFSET (UNIXWARE_SECTOR << 9) /* offset in bytes */
#define UNIXWARE_KBOFFSET (UNIXWARE_OFFSET >> 10) /* offset in 1024-blocks */
/* disklabel->d_magic offset within the last 1024 block */
#define UNIXWARE_MAGICOFFSET (UNIXWARE_OFFSET - UNIXWARE_KBOFFSET + 4)
#define UNIXWARE_VTOCMAGIC 0x600DDEEEUL
#define UNIXWARE_MAXPARTITIONS 16
/* unixware_partition->s_label flags */
#define UNIXWARE_TAG_UNUSED 0x0000 /* unused partition */
#define UNIXWARE_TAG_BOOT 0x0001 /* boot fs */
#define UNIXWARE_TAG_ROOT 0x0002 /* root fs */
#define UNIXWARE_TAG_SWAP 0x0003 /* swap fs */
#define UNIXWARE_TAG_USER 0x0004 /* user fs */
#define UNIXWARE_TAG_ENTIRE_DISK 0x0005 /* whole disk */
#define UNIXWARE_TAG_ALT_S 0x0006 /* alternate sector space */
#define UNIXWARE_TAG_OTHER 0x0007 /* non unix */
#define UNIXWARE_TAG_ALT_T 0x0008 /* alternate track space */
#define UNIXWARE_TAG_STAND 0x0009 /* stand partition */
#define UNIXWARE_TAG_VAR 0x000a /* var partition */
#define UNIXWARE_TAG_HOME 0x000b /* home partition */
#define UNIXWARE_TAG_DUMP 0x000c /* dump partition */
#define UNIXWARE_TAG_ALT_ST 0x000d /* alternate sector track */
#define UNIXWARE_TAG_VM_PUBLIC 0x000e /* volume mgt public partition */
#define UNIXWARE_TAG_VM_PRIVATE 0x000f /* volume mgt private partition */
/* unixware_partition->s_flags flags */
#define UNIXWARE_FLAG_VALID 0x0200
struct unixware_partition {
uint16_t s_label; /* partition label (tag) */
uint16_t s_flags; /* permission flags */
uint32_t start_sect; /* starting sector */
uint32_t nr_sects; /* number of sectors */
} __attribute__((packed));
struct unixware_disklabel {
uint32_t d_type; /* drive type */
uint32_t d_magic; /* the magic number */
uint32_t d_version; /* version number */
char d_serial[12]; /* serial number of the device */
uint32_t d_ncylinders; /* # of data cylinders per device */
uint32_t d_ntracks; /* # of tracks per cylinder */
uint32_t d_nsectors; /* # of data sectors per track */
uint32_t d_secsize; /* # of bytes per sector */
uint32_t d_part_start; /* # of first sector of this partition */
uint32_t d_unknown1[12]; /* ? */
uint32_t d_alt_tbl; /* byte offset of alternate table */
uint32_t d_alt_len; /* byte length of alternate table */
uint32_t d_phys_cyl; /* # of physical cylinders per device */
uint32_t d_phys_trk; /* # of physical tracks per cylinder */
uint32_t d_phys_sec; /* # of physical sectors per track */
uint32_t d_phys_bytes; /* # of physical bytes per sector */
uint32_t d_unknown2; /* ? */
uint32_t d_unknown3; /* ? */
uint32_t d_pad[8]; /* pad */
struct unixware_vtoc {
uint32_t v_magic; /* the magic number */
uint32_t v_version; /* version number */
char v_name[8]; /* volume name */
uint16_t v_nslices; /* # of partitions */
uint16_t v_unknown1; /* ? */
uint32_t v_reserved[10]; /* reserved */
struct unixware_partition
v_slice[UNIXWARE_MAXPARTITIONS]; /* partition */
} __attribute__((packed)) vtoc;
};
static int probe_unixware_pt(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
{
struct unixware_disklabel *l;
struct unixware_partition *p;
blkid_parttable tab = NULL;
blkid_partition parent;
blkid_partlist ls;
int i;
l = (struct unixware_disklabel *)
blkid_probe_get_sector(pr, UNIXWARE_SECTOR);
if (!l) {
if (errno)
return -errno;
goto nothing;
}
if (le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_VTOCMAGIC)
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;
parent = blkid_partlist_get_parent(ls);
tab = blkid_partlist_new_parttable(ls, "unixware", UNIXWARE_OFFSET);
if (!tab)
goto err;
/* Skip the first partition that describe whole disk
*/
for (i = 1, p = &l->vtoc.v_slice[1];
i < UNIXWARE_MAXPARTITIONS; i++, p++) {
uint32_t start, size;
uint16_t tag, flg;
blkid_partition par;
tag = le16_to_cpu(p->s_label);
flg = le16_to_cpu(p->s_flags);
if (tag == UNIXWARE_TAG_UNUSED ||
tag == UNIXWARE_TAG_ENTIRE_DISK ||
flg != UNIXWARE_FLAG_VALID)
continue;
start = le32_to_cpu(p->start_sect);
size = le32_to_cpu(p->nr_sects);
if (parent && !blkid_is_nested_dimension(parent, start, size)) {
DBG(LOWPROBE, ul_debug(
"WARNING: unixware partition (%d) overflow "
"detected, ignore", i));
continue;
}
par = blkid_partlist_add_partition(ls, tab, start, size);
if (!par)
goto err;
blkid_partition_set_type(par, tag);
blkid_partition_set_flags(par, flg);
}
return BLKID_PROBE_OK;
nothing:
return BLKID_PROBE_NONE;
err:
return -ENOMEM;
}
/*
* The unixware partition table is within primary DOS partition. The PT is
* located on 29 sector, PT magic string is d_magic member of 'struct
* unixware_disklabel'.
*/
const struct blkid_idinfo unixware_pt_idinfo =
{
.name = "unixware",
.probefunc = probe_unixware_pt,
.minsz = 1024 * 1440 + 1, /* ignore floppies */
.magics =
{
{
.magic = "\x0D\x60\xE5\xCA", /* little-endian magic string */
.len = 4, /* d_magic size in bytes */
.kboff = UNIXWARE_KBOFFSET,
.sboff = UNIXWARE_MAGICOFFSET
},
{ NULL }
}
};