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 "libfsid.h" 36 37 #include <vfs/ext2fs/ext2fs.h> 38 #include <vfs/ext2fs/fs.h> 39 40 /* 41 * struct ext2fs is actually ext4 compatible, 42 * whereas it used to be using the real ext2 superblock struct. 43 */ 44 static char buffer[sizeof(struct ext2fs)*2]; 45 46 fsid_t 47 ext2_probe(const char *dev) 48 { 49 static struct ext2fs *fs; 50 51 if (fsid_dev_read(dev, SBOFF, sizeof(buffer), buffer) != 0) 52 return FSID_UNKNOWN; 53 54 fs = (struct ext2fs *)&buffer; 55 56 if (fs->e2fs_magic == E2FS_MAGIC) 57 return FSID_EXT2; 58 59 return FSID_UNKNOWN; 60 } 61 62 char * 63 ext2_volname(const char *dev) 64 { 65 static struct ext2fs *fs; 66 67 if (fsid_dev_read(dev, SBOFF, sizeof(buffer), buffer) != 0) 68 return NULL; 69 70 fs = (struct ext2fs *)&buffer; 71 72 if (fs->e2fs_magic != E2FS_MAGIC || fs->e2fs_vname[0] == '\0') 73 return NULL; 74 75 fs->e2fs_vname[sizeof(fs->e2fs_vname) - 1] = '\0'; 76 77 return fs->e2fs_vname; 78 } 79