1 /* $NetBSD: ufs.c,v 1.1 2018/01/09 03:31:15 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 The NetBSD Foundation, Inc. 5 * Copyright (c) 2016 The DragonFly Project 6 * Copyright (c) 2002, 2003 Gordon Tetlow 7 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 8 * Copyright (c) 2014 The FreeBSD Foundation 9 * All rights reserved. 10 * 11 * This code is derived from software contributed to The NetBSD Foundation 12 * by Tomohiro Kusumi <kusumi.tomohiro@gmail.com>. 13 * 14 * This software was developed by Edward Tomasz Napierala under sponsorship 15 * from the FreeBSD Foundation. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 #include <sys/cdefs.h> 39 __RCSID("$NetBSD: ufs.c,v 1.1 2018/01/09 03:31:15 christos Exp $"); 40 41 #include <sys/types.h> 42 #include <stdint.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 47 #include <ufs/ffs/fs.h> 48 49 #include "fstyp.h" 50 51 static const int superblocks[] = SBLOCKSEARCH; 52 53 int 54 fstyp_ufs(FILE *fp, char *label, size_t labelsize) 55 { 56 int sb, superblock; 57 struct fs *fs; 58 59 /* 60 * Walk through the standard places that superblocks hide and look 61 * for UFS magic. If we find magic, then check that the size in the 62 * superblock corresponds to the size of the underlying provider. 63 * Finally, look for a volume label and create an appropriate 64 * provider based on that. 65 */ 66 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 67 fs = (struct fs *)read_buf(fp, superblock, SBLOCKSIZE); 68 if (fs == NULL) 69 continue; 70 /* 71 * Check for magic. We also need to check if file system size 72 * is equal to providers size, because sysinstall(8) used to 73 * bogusly put first partition at offset 0 instead of 16, and 74 * glabel/ufs would find file system on slice instead of 75 * partition. 76 */ 77 #ifdef notyet 78 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 && 79 ((pp->mediasize / fs->fs_fsize == fs->fs_old_size) || 80 (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) { 81 /* Valid UFS1. */ 82 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 && 83 ((pp->mediasize / fs->fs_fsize == fs->fs_size) || 84 (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) { 85 /* Valid UFS2. */ 86 } else { 87 g_free(fs); 88 continue; 89 } 90 #else 91 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) { 92 /* Valid UFS1. */ 93 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) { 94 /* Valid UFS2. */ 95 } else { 96 free(fs); 97 continue; 98 } 99 #endif 100 101 if (fs->fs_sblockloc != superblock || fs->fs_ncg < 1 || 102 fs->fs_bsize < MINBSIZE || 103 (size_t)fs->fs_bsize < sizeof(struct fs)) { 104 free(fs); 105 continue; 106 } 107 108 strlcpy(label, (char*)fs->fs_volname, labelsize); 109 110 free(fs); 111 return 0; 112 } 113 114 return 1; 115 } 116