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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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>
#include "superblocks.h"
struct jfs_super_block {
unsigned char js_magic[4];
uint32_t js_version;
uint64_t js_size;
uint32_t js_bsize; /* 4: aggregate block size in bytes */
uint16_t js_l2bsize; /* 2: log2 of s_bsize */
uint16_t js_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
uint32_t js_pbsize; /* 4: hardware/LVM block size in bytes */
uint16_t js_l2pbsize; /* 2: log2 of s_pbsize */
uint16_t js_pad; /* 2: padding necessary for alignment */
uint32_t js_dummy2[26];
unsigned char js_uuid[16];
unsigned char js_label[16];
unsigned char js_loguuid[16];
};
static int probe_jfs(blkid_probe pr, const struct blkid_idmag *mag)
{
struct jfs_super_block *js;
js = blkid_probe_get_sb(pr, mag, struct jfs_super_block);
if (!js)
return errno ? -errno : 1;
if (le16_to_cpu(js->js_l2bsize) > 31 || le16_to_cpu(js->js_l2pbsize) > 31)
return 1;
if (le32_to_cpu(js->js_bsize) != (1U << le16_to_cpu(js->js_l2bsize)))
return 1;
if (le32_to_cpu(js->js_pbsize) != (1U << le16_to_cpu(js->js_l2pbsize)))
return 1;
if ((le16_to_cpu(js->js_l2bsize) - le16_to_cpu(js->js_l2pbsize)) !=
le16_to_cpu(js->js_l2bfactor))
return 1;
if (*((char *) js->js_label) != '\0')
blkid_probe_set_label(pr, js->js_label, sizeof(js->js_label));
blkid_probe_set_uuid(pr, js->js_uuid);
blkid_probe_set_fsblocksize(pr, le32_to_cpu(js->js_bsize));
blkid_probe_set_block_size(pr, le32_to_cpu(js->js_bsize));
return 0;
}
const struct blkid_idinfo jfs_idinfo =
{
.name = "jfs",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_jfs,
.minsz = 16 * 1024 * 1024,
.magics =
{
{ .magic = "JFS1", .len = 4, .kboff = 32 },
{ NULL }
}
};
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