1 /* 2 * Copyright (c) 2010 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Ákos Kovács <akoskovacs@gmx.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/stat.h> 36 37 #include <errno.h> 38 39 #include "libfsid.h" 40 41 static struct fs_type fs_types[] = { 42 { "HAMMER", hammer_probe, hammer_volname }, 43 { "UFS", ufs_probe, ufs_volname }, 44 { "CD9660", cd9660_probe, cd9660_volname }, 45 { "EXT2", ext2_probe, ext2_volname }, 46 { "MSDOSFS",msdosfs_probe, msdosfs_volname }, 47 { NULL, NULL, NULL } 48 }; 49 50 const char * 51 fsid_fsname(fsid_t id) 52 { 53 if (id < 1) 54 return 0; 55 56 return fs_types[id-1].fs_name; 57 } 58 59 int 60 fsid_fs_count(void) 61 { 62 int count; 63 64 for (count = 0; fs_types[count].fs_name != NULL; count++) 65 ; /* nothing */ 66 67 return count; 68 } 69 70 fsid_t 71 fsid_probe(const char *dev, const char *fs_type) 72 { 73 int i; 74 75 if (dev == NULL || fs_type == NULL) 76 return FSID_UNKNOWN; 77 78 for (i = 0; fs_types[i].fs_name != NULL; i++) { 79 if ((strcmp(fs_type, fs_types[i].fs_name)) == 0) 80 return fs_types[i].fs_probe(dev); 81 } 82 return FSID_UNKNOWN; 83 } 84 85 fsid_t 86 fsid_probe_all(const char *dev) 87 { 88 int i; 89 fsid_t ret; 90 91 if (dev == NULL) 92 return FSID_UNKNOWN; 93 94 for (i = 0; fs_types[i].fs_name != NULL; i++) { 95 if ((ret = fs_types[i].fs_probe(dev)) != FSID_UNKNOWN) 96 return ret; 97 } 98 return FSID_UNKNOWN; 99 } 100 101 char * 102 fsid_volname(const char *dev, const char *fs_type) 103 { 104 int i; 105 106 if (dev == NULL || fs_type == NULL) 107 return NULL; 108 109 for (i = 0; fs_types[i].fs_name != NULL; i++) { 110 if ((strcmp(fs_type, fs_types[i].fs_name)) == 0) { 111 return fs_types[i].fs_volname(dev); 112 } 113 } 114 return NULL; 115 } 116 117 char * 118 fsid_volname_all(const char *dev) 119 { 120 int fs_id; 121 122 if (dev == NULL) 123 return NULL; 124 125 if ((fs_id = fsid_probe_all(dev)) != 0) 126 return fs_types[fs_id - 1].fs_volname(dev); 127 else 128 return NULL; 129 } 130 131 int 132 fsid_dev_read(const char *dev, off_t off, size_t len, char *buf) 133 { 134 int fd; 135 136 if ((fd = open(dev, O_RDONLY)) < 0) 137 return -1; 138 139 if ((lseek(fd, off, SEEK_SET)) < 0) { 140 close(fd); 141 return -1; 142 } 143 144 bzero(buf, len); 145 if ((read(fd, buf, len)) < 0) { 146 close(fd); 147 return -1; 148 } 149 150 close(fd); 151 152 return 0; 153 } 154