118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*-
|
|
* Copyright (c) 2005 Stanislav Sedov
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <geom/geom.h>
|
|
#include <geom/label/g_label.h>
|
|
|
|
#define REISERFS_NEW_DISK_OFFSET 64 * 1024
|
|
#define REISERFS_OLD_DISK_OFFSET 8 * 1024
|
|
#define REISERFS_SUPER_MAGIC "ReIsEr"
|
|
|
|
typedef struct reiserfs_sb {
|
|
uint8_t fake1[52];
|
|
char s_magic[10];
|
|
uint8_t fake2[10];
|
|
uint16_t s_version;
|
|
uint8_t fake3[26];
|
|
char s_volume_name[16];
|
|
} reiserfs_sb_t;
|
|
|
|
static reiserfs_sb_t *
|
|
g_label_reiserfs_read_super(struct g_consumer *cp, off_t offset)
|
|
{
|
|
reiserfs_sb_t *fs;
|
|
u_int secsize;
|
|
|
|
secsize = cp->provider->sectorsize;
|
|
|
|
if ((offset % secsize) != 0)
|
|
return (NULL);
|
|
|
|
fs = (reiserfs_sb_t *)g_read_data(cp, offset, secsize, NULL);
|
|
if (fs == NULL)
|
|
return (NULL);
|
|
|
|
if (strncmp(fs->s_magic, REISERFS_SUPER_MAGIC,
|
|
strlen(REISERFS_SUPER_MAGIC)) != 0) {
|
|
g_free(fs);
|
|
return (NULL);
|
|
}
|
|
|
|
return (fs);
|
|
}
|
|
|
|
static void
|
|
g_label_reiserfs_taste(struct g_consumer *cp, char *label, size_t size)
|
|
{
|
|
struct g_provider *pp;
|
|
reiserfs_sb_t *fs;
|
|
|
|
g_topology_assert_not();
|
|
pp = cp->provider;
|
|
label[0] = '\0';
|
|
|
|
/* Try old format */
|
|
fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET);
|
|
if (fs == NULL) {
|
|
/* Try new format */
|
|
fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET);
|
|
}
|
|
if (fs == NULL)
|
|
return;
|
|
|
|
/* Check version */
|
|
if (fs->s_version == 2) {
|
|
G_LABEL_DEBUG(1, "reiserfs file system detected on %s.",
|
|
pp->name);
|
|
} else {
|
|
goto exit_free;
|
|
}
|
|
|
|
/* Check for volume label */
|
|
if (fs->s_volume_name[0] == '\0')
|
|
goto exit_free;
|
|
|
|
/* Terminate label */
|
|
fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
|
|
strlcpy(label, fs->s_volume_name, size);
|
|
|
|
exit_free:
|
|
g_free(fs);
|
|
}
|
|
|
|
const struct g_label_desc g_label_reiserfs = {
|
|
.ld_taste = g_label_reiserfs_taste,
|
|
.ld_dir = "reiserfs"
|
|
};
|