1 /*- 2 * Copyright (c) 2016 The DragonFly Project 3 * Copyright (c) 2002, 2003 Gordon Tetlow 4 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * Copyright (c) 2014 The FreeBSD Foundation 6 * All rights reserved. 7 * 8 * This software was developed by Edward Tomasz Napierala under sponsorship 9 * from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/types.h> 35 #include <stdint.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <vfs/ufs/ufs_types.h> 40 #include <vfs/ufs/fs.h> 41 42 #include "fstyp.h" 43 44 /* 45 * Filesystem identification 46 */ 47 #define FS_UFS1_MAGIC 0x011954 /* UFS1 fast filesystem magic number */ 48 #define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast filesystem magic number */ 49 50 #define SBLOCK_FLOPPY 0 51 #define SBLOCK_UFS1 8192 52 #define SBLOCK_UFS2 65536 53 #define SBLOCK_PIGGY 262144 54 #define SBLOCKSIZE 8192 55 #define SBLOCKSEARCH \ 56 { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 } 57 58 static const int superblocks[] = SBLOCKSEARCH; 59 60 int 61 fstyp_ufs(FILE *fp, char *label, size_t labelsize) 62 { 63 int sb, superblock; 64 struct fs *fs; 65 66 /* 67 * Walk through the standard places that superblocks hide and look 68 * for UFS magic. If we find magic, then check that the size in the 69 * superblock corresponds to the size of the underlying provider. 70 * Finally, look for a volume label and create an appropriate 71 * provider based on that. 72 */ 73 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 74 fs = (struct fs *)read_buf(fp, superblock, SBLOCKSIZE); 75 if (fs == NULL) 76 continue; 77 /* 78 * Check for magic. We also need to check if file system size is equal 79 * to providers size, because sysinstall(8) used to bogusly put first 80 * partition at offset 0 instead of 16, and glabel/ufs would find file 81 * system on slice instead of partition. 82 */ 83 #ifdef notyet 84 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 && 85 ((pp->mediasize / fs->fs_fsize == fs->fs_old_size) || 86 (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) { 87 /* Valid UFS1. */ 88 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 && 89 ((pp->mediasize / fs->fs_fsize == fs->fs_size) || 90 (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) { 91 /* Valid UFS2. */ 92 } else { 93 g_free(fs); 94 continue; 95 } 96 #else 97 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) { 98 /* Valid UFS1. */ 99 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) { 100 /* Valid UFS2. */ 101 } else { 102 free(fs); 103 continue; 104 } 105 #endif 106 /* 107 * XXX: DragonFly 108 */ 109 if (/* fs->fs_sblockloc != superblock || */ 110 fs->fs_ncg < 1 || 111 fs->fs_bsize < MINBSIZE || 112 (size_t)fs->fs_bsize < sizeof(struct fs)) { 113 free(fs); 114 continue; 115 } 116 117 strlcpy(label, fs->fs_volname, labelsize); 118 119 free(fs); 120 return (0); 121 } 122 123 return (1); 124 } 125