1 /*
2 * Copyright (c) 2002 Juli Mallett. All rights reserved.
3 *
4 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
5 * FreeBSD project. Redistribution and use in source and binary forms, with
6 * or without modification, are permitted provided that the following
7 * conditions are met:
8 *
9 * 1. Redistribution of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * 2. Redistribution in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/mount.h>
33 #include <sys/disklabel.h>
34 #include <sys/stat.h>
35
36 #include <ufs/ufs/ufsmount.h>
37 #include <ufs/ufs/dinode.h>
38 #include <ufs/ffs/fs.h>
39
40 #include <errno.h>
41 #include <stdio.h>
42 #include <string.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45
46 #include <libufs.h>
47
48 static int superblocks[] = SBLOCKSEARCH;
49
50 int
sbread(struct uufsd * disk)51 sbread(struct uufsd *disk)
52 {
53 uint8_t block[MAXBSIZE];
54 struct fs *fs;
55 int sb, superblock;
56 int i, size, blks;
57 uint8_t *space;
58
59 ERROR(disk, NULL);
60
61 fs = &disk->d_fs;
62 superblock = superblocks[0];
63
64 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
65 if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) {
66 ERROR(disk, "non-existent or truncated superblock");
67 return (-1);
68 }
69 if (fs->fs_magic == FS_UFS1_MAGIC)
70 disk->d_ufs = 1;
71 if (fs->fs_magic == FS_UFS2_MAGIC &&
72 fs->fs_sblockloc == superblock)
73 disk->d_ufs = 2;
74 if (fs->fs_bsize <= MAXBSIZE &&
75 (size_t)fs->fs_bsize >= sizeof(*fs)) {
76 if (disk->d_ufs)
77 break;
78 }
79 disk->d_ufs = 0;
80 }
81 if (superblock == -1 || disk->d_ufs == 0) {
82 /*
83 * Other error cases will result in errno being set, here we
84 * must set it to indicate no superblock could be found with
85 * which to associate this disk/filesystem.
86 */
87 ERROR(disk, "no usable known superblock found");
88 errno = ENOENT;
89 return (-1);
90 }
91 disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1);
92 disk->d_sblock = superblock / disk->d_bsize;
93 /*
94 * Read in the superblock summary information.
95 */
96 size = fs->fs_cssize;
97 blks = howmany(size, fs->fs_fsize);
98 size += fs->fs_ncg * sizeof(int32_t);
99 space = malloc(size);
100 if (space == NULL) {
101 ERROR(disk, "failed to allocate space for summary information");
102 return (-1);
103 }
104 fs->fs_csp = (struct csum *)space;
105 for (i = 0; i < blks; i += fs->fs_frag) {
106 size = fs->fs_bsize;
107 if (i + fs->fs_frag > blks)
108 size = (blks - i) * fs->fs_fsize;
109 if (bread(disk, fsbtodb(fs, fs->fs_csaddr + i), block, size)
110 == -1) {
111 ERROR(disk, "Failed to read sb summary information");
112 free(fs->fs_csp);
113 return (-1);
114 }
115 bcopy(block, space, size);
116 space += size;
117 }
118 fs->fs_maxcluster = (uint32_t *)space;
119 disk->d_sbcsum = fs->fs_csp;
120
121 return (0);
122 }
123
124 int
sbwrite(struct uufsd * disk,int all)125 sbwrite(struct uufsd *disk, int all)
126 {
127 struct fs *fs;
128 int blks, size;
129 uint8_t *space;
130 unsigned i;
131
132 ERROR(disk, NULL);
133
134 fs = &disk->d_fs;
135
136 if (!disk->d_sblock) {
137 disk->d_sblock = disk->d_fs.fs_sblockloc / disk->d_bsize;
138 }
139
140 if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) {
141 ERROR(disk, "failed to write superblock");
142 return (-1);
143 }
144 /*
145 * Write superblock summary information.
146 */
147 blks = howmany(fs->fs_cssize, fs->fs_fsize);
148 space = (uint8_t *)disk->d_sbcsum;
149 for (i = 0; i < blks; i += fs->fs_frag) {
150 size = fs->fs_bsize;
151 if (i + fs->fs_frag > blks)
152 size = (blks - i) * fs->fs_fsize;
153 if (bwrite(disk, fsbtodb(fs, fs->fs_csaddr + i), space, size)
154 == -1) {
155 ERROR(disk, "Failed to write sb summary information");
156 return (-1);
157 }
158 space += size;
159 }
160 if (all) {
161 for (i = 0; i < fs->fs_ncg; i++)
162 if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)),
163 fs, SBLOCKSIZE) == -1) {
164 ERROR(disk, "failed to update a superblock");
165 return (-1);
166 }
167 }
168 return (0);
169 }
170