1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002 Juli Mallett. All rights reserved. 5 * 6 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the 7 * FreeBSD project. Redistribution and use in source and binary forms, with 8 * or without modification, are permitted provided that the following 9 * conditions are met: 10 * 11 * 1. Redistribution of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 2. Redistribution in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/mount.h> 35 #include <sys/disklabel.h> 36 #include <sys/stat.h> 37 38 #include <ufs/ufs/ufsmount.h> 39 #include <ufs/ufs/dinode.h> 40 #include <ufs/ffs/fs.h> 41 42 #include <errno.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 48 #include <libufs.h> 49 50 static int superblocks[] = SBLOCKSEARCH; 51 52 int 53 sbread(struct uufsd *disk) 54 { 55 uint8_t block[MAXBSIZE]; 56 struct fs *fs; 57 int sb, superblock; 58 int i, size, blks; 59 uint8_t *space; 60 61 ERROR(disk, NULL); 62 63 fs = &disk->d_fs; 64 superblock = superblocks[0]; 65 66 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 67 if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) { 68 ERROR(disk, "non-existent or truncated superblock"); 69 return (-1); 70 } 71 if (fs->fs_magic == FS_UFS1_MAGIC) 72 disk->d_ufs = 1; 73 if (fs->fs_magic == FS_UFS2_MAGIC && 74 fs->fs_sblockloc == superblock) 75 disk->d_ufs = 2; 76 if (fs->fs_bsize <= MAXBSIZE && 77 (size_t)fs->fs_bsize >= sizeof(*fs)) { 78 if (disk->d_ufs) 79 break; 80 } 81 disk->d_ufs = 0; 82 } 83 if (superblock == -1 || disk->d_ufs == 0) { 84 /* 85 * Other error cases will result in errno being set, here we 86 * must set it to indicate no superblock could be found with 87 * which to associate this disk/filesystem. 88 */ 89 ERROR(disk, "no usable known superblock found"); 90 errno = ENOENT; 91 return (-1); 92 } 93 disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1); 94 disk->d_sblock = superblock / disk->d_bsize; 95 /* 96 * Read in the superblock summary information. 97 */ 98 size = fs->fs_cssize; 99 blks = howmany(size, fs->fs_fsize); 100 size += fs->fs_ncg * sizeof(int32_t); 101 space = malloc(size); 102 if (space == NULL) { 103 ERROR(disk, "failed to allocate space for summary information"); 104 return (-1); 105 } 106 fs->fs_csp = (struct csum *)space; 107 for (i = 0; i < blks; i += fs->fs_frag) { 108 size = fs->fs_bsize; 109 if (i + fs->fs_frag > blks) 110 size = (blks - i) * fs->fs_fsize; 111 if (bread(disk, fsbtodb(fs, fs->fs_csaddr + i), block, size) 112 == -1) { 113 ERROR(disk, "Failed to read sb summary information"); 114 free(fs->fs_csp); 115 return (-1); 116 } 117 bcopy(block, space, size); 118 space += size; 119 } 120 fs->fs_maxcluster = (uint32_t *)space; 121 disk->d_sbcsum = fs->fs_csp; 122 123 return (0); 124 } 125 126 int 127 sbwrite(struct uufsd *disk, int all) 128 { 129 struct fs *fs; 130 int blks, size; 131 uint8_t *space; 132 unsigned i; 133 134 ERROR(disk, NULL); 135 136 fs = &disk->d_fs; 137 138 if (!disk->d_sblock) { 139 disk->d_sblock = disk->d_fs.fs_sblockloc / disk->d_bsize; 140 } 141 142 if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) { 143 ERROR(disk, "failed to write superblock"); 144 return (-1); 145 } 146 /* 147 * Write superblock summary information. 148 */ 149 blks = howmany(fs->fs_cssize, fs->fs_fsize); 150 space = (uint8_t *)disk->d_sbcsum; 151 for (i = 0; i < blks; i += fs->fs_frag) { 152 size = fs->fs_bsize; 153 if (i + fs->fs_frag > blks) 154 size = (blks - i) * fs->fs_fsize; 155 if (bwrite(disk, fsbtodb(fs, fs->fs_csaddr + i), space, size) 156 == -1) { 157 ERROR(disk, "Failed to write sb summary information"); 158 return (-1); 159 } 160 space += size; 161 } 162 if (all) { 163 for (i = 0; i < fs->fs_ncg; i++) 164 if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)), 165 fs, SBLOCKSIZE) == -1) { 166 ERROR(disk, "failed to update a superblock"); 167 return (-1); 168 } 169 } 170 return (0); 171 } 172