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/*
* Copyright (C) 1999 by Andries Brouwer
* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
* Copyright (C) 2001 by Andreas Dilger
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <string.h>
#include "superblocks.h"
#include "minix.h"
static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag)
{
unsigned char *ext;
int version;
/* for more details see magic strings below */
switch(mag->magic[1]) {
case '\023':
version = 1;
break;
case '\044':
version = 2;
break;
case '\115':
version = 3;
break;
default:
return -1;
break;
}
if (version <= 2) {
struct minix_super_block *sb;
uint32_t zones;
sb = blkid_probe_get_sb(pr, mag, struct minix_super_block);
if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
return -1;
zones = version == 2 ? sb->s_zones : sb->s_nzones;
/* sanity checks to be sure that the FS is really minix */
if (sb->s_imap_blocks * MINIX_BLOCK_SIZE * 8 < sb->s_ninodes + 1)
return -1;
if (sb->s_zmap_blocks * MINIX_BLOCK_SIZE * 8 < zones - sb->s_firstdatazone + 1)
return -1;
} else if (version == 3) {
struct minix3_super_block *sb;
sb = blkid_probe_get_sb(pr, mag, struct minix3_super_block);
if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
return -1;
}
/* unfortunately, some parts of ext3 is sometimes possible to
* interpreted as minix superblock. So check for extN magic
* string. (For extN magic string and offsets see ext.c.)
*/
ext = blkid_probe_get_buffer(pr, 0x400 + 0x38, 2);
if (ext && memcmp(ext, "\123\357", 2) == 0)
return -1;
blkid_probe_sprintf_version(pr, "%d", version);
return 0;
}
const struct blkid_idinfo minix_idinfo =
{
.name = "minix",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_minix,
.magics =
{
/* version 1 */
{ .magic = "\177\023", .len = 2, .kboff = 1, .sboff = 0x10 },
{ .magic = "\217\023", .len = 2, .kboff = 1, .sboff = 0x10 },
/* version 2 */
{ .magic = "\150\044", .len = 2, .kboff = 1, .sboff = 0x10 },
{ .magic = "\170\044", .len = 2, .kboff = 1, .sboff = 0x10 },
/* version 3 */
{ .magic = "\132\115", .len = 2, .kboff = 1, .sboff = 0x18 },
{ NULL }
}
};
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