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 <unistd.h> 44 45 #include <libufs.h> 46 47 static int superblocks[] = SBLOCKSEARCH; 48 49 int 50 sbread(struct uufsd *disk) 51 { 52 struct fs *fs; 53 int sb, superblock; 54 55 ERROR(disk, NULL); 56 57 fs = &disk->d_fs; 58 superblock = superblocks[0]; 59 60 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 61 if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) { 62 ERROR(disk, "non-existent or truncated superblock"); 63 return (-1); 64 } 65 if (fs->fs_magic == FS_UFS1_MAGIC) 66 disk->d_ufs = 1; 67 if (fs->fs_magic == FS_UFS2_MAGIC && 68 fs->fs_sblockloc == superblock) 69 disk->d_ufs = 2; 70 if (fs->fs_bsize <= MAXBSIZE && 71 (size_t)fs->fs_bsize >= sizeof(*fs)) { 72 if (disk->d_ufs) 73 break; 74 } 75 disk->d_ufs = 0; 76 } 77 if (superblock == -1 || disk->d_ufs == 0) { 78 /* 79 * Other error cases will result in errno being set, here we 80 * must set it to indicate no superblock could be found with 81 * which to associate this disk/filesystem. 82 */ 83 ERROR(disk, "no usable known superblock found"); 84 errno = ENOENT; 85 return (-1); 86 } 87 disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1); 88 disk->d_sblock = superblock / disk->d_bsize; 89 return (0); 90 } 91 92 int 93 sbwrite(struct uufsd *disk, int all) 94 { 95 struct fs *fs; 96 int i; 97 98 ERROR(disk, NULL); 99 100 fs = &disk->d_fs; 101 102 if (!disk->d_sblock) { 103 disk->d_sblock = disk->d_fs.fs_sblockloc / disk->d_bsize; 104 } 105 106 if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) { 107 ERROR(disk, "failed to write superblock"); 108 return (-1); 109 } 110 if (all) { 111 for (i = 0; i < fs->fs_ncg; i++) 112 if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)), 113 fs, SBLOCKSIZE) == -1) { 114 ERROR(disk, "failed to update a superblock"); 115 return (-1); 116 } 117 } 118 return (0); 119 } 120