1/*- 2 * Copyright (c) 2005 Stanislav Sedov 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: releng/10.3/sys/geom/label/g_label_reiserfs.c 199875 2009-11-28 11:57:43Z trasz $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/malloc.h> 34 35#include <geom/geom.h> 36#include <geom/label/g_label.h> 37 38#define REISERFS_NEW_DISK_OFFSET 64 * 1024 39#define REISERFS_OLD_DISK_OFFSET 8 * 1024 40#define REISERFS_SUPER_MAGIC "ReIsEr" 41 42typedef struct reiserfs_sb { 43 uint8_t fake1[52]; 44 char s_magic[10]; 45 uint8_t fake2[10]; 46 uint16_t s_version; 47 uint8_t fake3[26]; 48 char s_volume_name[16]; 49} reiserfs_sb_t; 50 51static reiserfs_sb_t * 52g_label_reiserfs_read_super(struct g_consumer *cp, off_t offset) 53{ 54 reiserfs_sb_t *fs; 55 u_int secsize; 56 57 secsize = cp->provider->sectorsize; 58 59 if ((offset % secsize) != 0) 60 return (NULL); 61 62 fs = (reiserfs_sb_t *)g_read_data(cp, offset, secsize, NULL); 63 if (fs == NULL) 64 return (NULL); 65 66 if (strncmp(fs->s_magic, REISERFS_SUPER_MAGIC, 67 strlen(REISERFS_SUPER_MAGIC)) != 0) { 68 g_free(fs); 69 return (NULL); 70 } 71 72 return (fs); 73} 74 75static void 76g_label_reiserfs_taste(struct g_consumer *cp, char *label, size_t size) 77{ 78 struct g_provider *pp; 79 reiserfs_sb_t *fs; 80 81 g_topology_assert_not(); 82 pp = cp->provider; 83 label[0] = '\0'; 84 85 /* Try old format */ 86 fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET); 87 if (fs == NULL) { 88 /* Try new format */ 89 fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET); 90 } 91 if (fs == NULL) 92 return; 93 94 /* Check version */ 95 if (fs->s_version == 2) { 96 G_LABEL_DEBUG(1, "reiserfs file system detected on %s.", 97 pp->name); 98 } else { 99 goto exit_free; 100 } 101 102 /* Check for volume label */ 103 if (fs->s_volume_name[0] == '\0') 104 goto exit_free; 105 106 /* Terminate label */ 107 fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0'; 108 strlcpy(label, fs->s_volume_name, size); 109 110exit_free: 111 g_free(fs); 112} 113 114struct g_label_desc g_label_reiserfs = { 115 .ld_taste = g_label_reiserfs_taste, 116 .ld_dir = "reiserfs", 117 .ld_enabled = 1 118}; 119 120G_LABEL_INIT(reiserfs, g_label_reiserfs, "Create device nodes for REISERFS volumes"); 121