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 FS_MAGIC /* 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
fstyp_ufs(FILE * fp,char * label,size_t labelsize,const char * devpath)61 fstyp_ufs(FILE *fp, char *label, size_t labelsize, const char *devpath)
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