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/*-
* 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);
}
struct g_label_desc g_label_reiserfs = {
.ld_taste = g_label_reiserfs_taste,
.ld_dir = "reiserfs",
.ld_enabled = 1
};
G_LABEL_INIT(reiserfs, g_label_reiserfs, "Create device nodes for REISERFS volumes");
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