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("$FreeBSD$"); 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 EXT2FS_SB_OFFSET 1024 39148978Spjd#define EXT2_SUPER_MAGIC 0xef53 40148978Spjd#define EXT2_DYNAMIC_REV 1 41148978Spjd 42148978Spjdtypedef struct e2sb { 43148978Spjd uint8_t fake1[56]; 44148978Spjd uint16_t s_magic; 45148978Spjd uint8_t fake2[18]; 46148978Spjd uint32_t s_rev_level; 47148978Spjd uint8_t fake3[40]; 48148978Spjd char s_volume_name[16]; 49148978Spjd} e2sb_t; 50148978Spjd 51148978Spjdstatic void 52148978Spjdg_label_ext2fs_taste(struct g_consumer *cp, char *label, size_t size) 53148978Spjd{ 54148978Spjd struct g_provider *pp; 55148978Spjd e2sb_t *fs; 56219400Ssobomax char *s_volume_name; 57148978Spjd 58148978Spjd g_topology_assert_not(); 59148978Spjd pp = cp->provider; 60148978Spjd label[0] = '\0'; 61148978Spjd 62149395Spjd if ((EXT2FS_SB_OFFSET % pp->sectorsize) != 0) 63149395Spjd return; 64149395Spjd 65148978Spjd fs = (e2sb_t *)g_read_data(cp, EXT2FS_SB_OFFSET, pp->sectorsize, NULL); 66148978Spjd if (fs == NULL) 67148978Spjd return; 68148978Spjd 69148978Spjd /* Check for magic and versio n*/ 70148978Spjd if (fs->s_magic == EXT2_SUPER_MAGIC && 71148978Spjd fs->s_rev_level == EXT2_DYNAMIC_REV) { 72148978Spjd G_LABEL_DEBUG(1, "ext2fs file system detected on %s.", 73148978Spjd pp->name); 74148978Spjd } else { 75148978Spjd goto exit_free; 76148978Spjd } 77148978Spjd 78219400Ssobomax s_volume_name = fs->s_volume_name; 79219400Ssobomax /* Terminate label */ 80219400Ssobomax s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0'; 81219400Ssobomax 82219400Ssobomax if (s_volume_name[0] == '/') 83219400Ssobomax s_volume_name += 1; 84219400Ssobomax 85148978Spjd /* Check for volume label */ 86219400Ssobomax if (s_volume_name[0] == '\0') 87148978Spjd goto exit_free; 88148978Spjd 89219400Ssobomax strlcpy(label, s_volume_name, size); 90148978Spjd 91148978Spjdexit_free: 92148978Spjd g_free(fs); 93148978Spjd} 94148978Spjd 95199875Straszstruct g_label_desc g_label_ext2fs = { 96148978Spjd .ld_taste = g_label_ext2fs_taste, 97199875Strasz .ld_dir = "ext2fs", 98199875Strasz .ld_enabled = 1 99148978Spjd}; 100199875Strasz 101199875StraszG_LABEL_INIT(ext2fs, g_label_ext2fs, "Create device nodes for EXT2FS volumes"); 102