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/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <asm/types.h>
#include "volume_id.h"
#include "logging.h"
#include "util.h"
#include "sysv.h"
#define SYSV_NICINOD 100
#define SYSV_NICFREE 50
struct sysv_super
{
__u16 s_isize;
__u16 s_pad0;
__u32 s_fsize;
__u16 s_nfree;
__u16 s_pad1;
__u32 s_free[SYSV_NICFREE];
__u16 s_ninode;
__u16 s_pad2;
__u16 s_inode[SYSV_NICINOD];
__u8 s_flock;
__u8 s_ilock;
__u8 s_fmod;
__u8 s_ronly;
__u32 s_time;
__u16 s_dinfo[4];
__u32 s_tfree;
__u16 s_tinode;
__u16 s_pad3;
__u8 s_fname[6];
__u8 s_fpack[6];
__u32 s_fill[12];
__u32 s_state;
__u32 s_magic;
__u32 s_type;
} __attribute__((__packed__));
#define XENIX_NICINOD 100
#define XENIX_NICFREE 100
struct xenix_super {
__u16 s_isize;
__u32 s_fsize;
__u16 s_nfree;
__u32 s_free[XENIX_NICFREE];
__u16 s_ninode;
__u16 s_inode[XENIX_NICINOD];
__u8 s_flock;
__u8 s_ilock;
__u8 s_fmod;
__u8 s_ronly;
__u32 s_time;
__u32 s_tfree;
__u16 s_tinode;
__u16 s_dinfo[4];
__u8 s_fname[6];
__u8 s_fpack[6];
__u8 s_clean;
__u8 s_fill[371];
__u32 s_magic;
__u32 s_type;
} __attribute__((__packed__));
#define SYSV_SUPERBLOCK_BLOCK 0x01
#define SYSV_MAGIC 0xfd187e20
#define XENIX_SUPERBLOCK_BLOCK 0x18
#define XENIX_MAGIC 0x2b5544
#define SYSV_MAX_BLOCKSIZE 0x800
int volume_id_probe_sysv(struct volume_id *id, __u64 off)
{
struct sysv_super *vs;
struct xenix_super *xs;
unsigned int boff;
dbg("probing at offset 0x%llx", (unsigned long long) off);
for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
vs = (struct sysv_super *)
volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
if (vs == NULL)
return -1;
if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
volume_id_set_label_raw(id, vs->s_fname, 6);
volume_id_set_label_string(id, vs->s_fname, 6);
id->type = "sysv";
goto found;
}
}
for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
xs = (struct xenix_super *)
volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
if (xs == NULL)
return -1;
if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
volume_id_set_label_raw(id, xs->s_fname, 6);
volume_id_set_label_string(id, xs->s_fname, 6);
id->type = "xenix";
goto found;
}
}
return -1;
found:
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
return 0;
}
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