sblock.c revision 99222
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: head/lib/libufs/sblock.c 99222 2002-07-01 18:19:20Z jmallett $"); 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 <fcntl.h> 42#include <stdio.h> 43#include <string.h> 44#include <unistd.h> 45 46#include <libufs.h> 47 48static int superblocks[] = SBLOCKSEARCH; 49 50int 51sbread(struct uufsd *disk) 52{ 53 struct fs *fs; 54 int sb, superblock; 55 56 DEBUG(NULL); 57 58 fs = &disk->d_fs; 59 superblock = superblocks[0]; 60 61 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 62 if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) { 63 DEBUG(NULL); 64 return -1; 65 } 66 if (fs->fs_magic == FS_UFS1_MAGIC) 67 disk->d_ufs = 1; 68 if ((fs->fs_magic == FS_UFS2_MAGIC) && 69 (fs->fs_sblockloc == numfrags(fs, superblock))) 70 disk->d_ufs = 2; 71 if ((fs->fs_bsize <= MAXBSIZE) && 72 (fs->fs_bsize >= sizeof(*fs))) { 73 if (disk->d_ufs) 74 break; 75 } 76 disk->d_ufs = 0; 77 } 78 if (superblock == -1 || disk->d_ufs == 0) { 79 /* 80 * Other error cases will result in errno being set, here we 81 * must set it to indicate no superblock could be found with 82 * which to associate this disk/filesystem. 83 */ 84 DEBUG("no superblock found"); 85 errno = ENOENT; 86 return -1; 87 } 88 disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1); 89 disk->d_sblock = superblock / disk->d_bsize; 90 return 0; 91} 92 93int 94sbwrite(struct uufsd *disk, int all) 95{ 96 struct fs *fs; 97 int i, rofd; 98 99 DEBUG(NULL); 100 101 fs = &disk->d_fs; 102 103 rofd = disk->d_fd; 104 disk->d_fd = open(disk->d_name, O_WRONLY); 105 if (disk->d_fd < 0) { 106 DEBUG("open"); 107 return -1; 108 } 109 if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) { 110 DEBUG(NULL); 111 return -1; 112 } 113 if (all) { 114 for (i = 0; i < fs->fs_ncg; i++) 115 if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)), 116 fs, SBLOCKSIZE) == -1) { 117 DEBUG(NULL); 118 return -1; 119 } 120 } 121 close(disk->d_fd); 122 disk->d_fd = rofd; 123 return 0; 124} 125