g_label_reiserfs.c revision 148978
1148978Spjd/*- 2148978Spjd * Copyright (c) 2005 Stanislav Sedov 3148978Spjd * All rights reserved. 4148978Spjd * 5148978Spjd * Redistribution and use in source and binary forms, with or without 6148978Spjd * modification, are permitted provided that the following conditions 7148978Spjd * are met: 8148978Spjd * 1. Redistributions of source code must retain the above copyright 9148978Spjd * notice, this list of conditions and the following disclaimer. 10148978Spjd * 2. Redistributions in binary form must reproduce the above copyright 11148978Spjd * notice, this list of conditions and the following disclaimer in the 12148978Spjd * documentation and/or other materials provided with the distribution. 13148978Spjd * 14148978Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15148978Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16148978Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17148978Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18148978Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19148978Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20148978Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21148978Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22148978Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23148978Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24148978Spjd * SUCH DAMAGE. 25148978Spjd */ 26148978Spjd 27148978Spjd#include <sys/cdefs.h> 28148978Spjd__FBSDID("$FreeBSD: head/sys/geom/label/g_label_reiserfs.c 148978 2005-08-12 00:27:45Z pjd $"); 29148978Spjd 30148978Spjd#include <sys/param.h> 31148978Spjd#include <sys/systm.h> 32148978Spjd#include <sys/kernel.h> 33148978Spjd#include <sys/malloc.h> 34148978Spjd 35148978Spjd#include <geom/geom.h> 36148978Spjd#include <geom/label/g_label.h> 37148978Spjd 38148978Spjd#define REISERFS_NEW_DISK_OFFSET 64 * 1024 39148978Spjd#define REISERFS_OLD_DISK_OFFSET 8 * 1024 40148978Spjd#define REISERFS_SUPER_MAGIC "ReIsEr" 41148978Spjd 42148978Spjdtypedef struct resiserfs_sb { 43148978Spjd uint8_t fake1[52]; 44148978Spjd char s_magic[10]; 45148978Spjd uint8_t fake2[10]; 46148978Spjd uint16_t s_version; 47148978Spjd uint8_t fake3[26]; 48148978Spjd char s_volume_name[16]; 49148978Spjd} reiserfs_sb_t; 50148978Spjd 51148978Spjdstatic reiserfs_sb_t * 52148978Spjdg_label_reiserfs_read_super(struct g_consumer *cp, off_t offset, off_t len) 53148978Spjd{ 54148978Spjd reiserfs_sb_t *fs; 55148978Spjd 56148978Spjd fs = (reiserfs_sb_t *)g_read_data(cp, offset, len, NULL); 57148978Spjd if (fs == NULL) 58148978Spjd return (NULL); 59148978Spjd 60148978Spjd if (strncmp(fs->s_magic, REISERFS_SUPER_MAGIC, 61148978Spjd strlen(REISERFS_SUPER_MAGIC)) != 0) { 62148978Spjd g_free(fs); 63148978Spjd return (NULL); 64148978Spjd } 65148978Spjd 66148978Spjd return (fs); 67148978Spjd} 68148978Spjd 69148978Spjdstatic void 70148978Spjdg_label_reiserfs_taste(struct g_consumer *cp, char *label, size_t size) 71148978Spjd{ 72148978Spjd struct g_provider *pp; 73148978Spjd reiserfs_sb_t *fs; 74148978Spjd 75148978Spjd g_topology_assert_not(); 76148978Spjd pp = cp->provider; 77148978Spjd label[0] = '\0'; 78148978Spjd 79148978Spjd /* Try old format */ 80148978Spjd fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET, 81148978Spjd pp->sectorsize); 82148978Spjd if (fs == NULL) { 83148978Spjd /* Try new format */ 84148978Spjd fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET, 85148978Spjd pp->sectorsize); 86148978Spjd } 87148978Spjd if (fs == NULL) 88148978Spjd return; 89148978Spjd 90148978Spjd /* Check version */ 91148978Spjd if (fs->s_version == 2) { 92148978Spjd G_LABEL_DEBUG(1, "reiserfs file system detected on %s.", 93148978Spjd pp->name); 94148978Spjd } else { 95148978Spjd goto exit_free; 96148978Spjd } 97148978Spjd 98148978Spjd /* Check for volume label */ 99148978Spjd if (fs->s_volume_name[0] == '\0') 100148978Spjd goto exit_free; 101148978Spjd 102148978Spjd /* Terminate label */ 103148978Spjd fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0'; 104148978Spjd strlcpy(label, fs->s_volume_name, size); 105148978Spjd 106148978Spjdexit_free: 107148978Spjd g_free(fs); 108148978Spjd} 109148978Spjd 110148978Spjdconst struct g_label_desc g_label_reiserfs = { 111148978Spjd .ld_taste = g_label_reiserfs_taste, 112148978Spjd .ld_dir = "reiserfs" 113148978Spjd}; 114