sblock.c revision 116084
118334Speter/* 2132718Skan * Copyright (c) 2002 Juli Mallett. All rights reserved. 3169689Skan * 4169689Skan * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the 518334Speter * FreeBSD project. Redistribution and use in source and binary forms, with 690075Sobrien * or without modification, are permitted provided that the following 718334Speter * conditions are met: 890075Sobrien * 990075Sobrien * 1. Redistribution of source code must retain the above copyright notice, 1090075Sobrien * this list of conditions and the following disclaimer. 1190075Sobrien * 2. Redistribution in binary form must reproduce the above copyright 1218334Speter * notice, this list of conditions and the following disclaimer in the 1390075Sobrien * documentation and/or other materials provided with the distribution. 1490075Sobrien * 1590075Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1690075Sobrien * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 1718334Speter * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 1818334Speter * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 1990075Sobrien * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20169689Skan * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21169689Skan * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2218334Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 2318334Speter * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 2418334Speter * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 2518334Speter * POSSIBILITY OF SUCH DAMAGE. 2618334Speter */ 2718334Speter 2818334Speter#include <sys/cdefs.h> 2918334Speter__FBSDID("$FreeBSD: head/lib/libufs/sblock.c 116084 2003-06-09 09:32:29Z jmallett $"); 3018334Speter 3150397Sobrien#include <sys/param.h> 3250397Sobrien#include <sys/mount.h> 3318334Speter#include <sys/disklabel.h> 3418334Speter#include <sys/stat.h> 3518334Speter 3618334Speter#include <ufs/ufs/ufsmount.h> 3718334Speter#include <ufs/ufs/dinode.h> 3818334Speter#include <ufs/ffs/fs.h> 3918334Speter 4018334Speter#include <errno.h> 4150397Sobrien#include <stdio.h> 4250397Sobrien#include <string.h> 43169689Skan#include <unistd.h> 44169689Skan 45169689Skan#include <libufs.h> 4650397Sobrien 4750397Sobrienstatic int superblocks[] = SBLOCKSEARCH; 4850397Sobrien 49132718Skanint 50132718Skansbread(struct uufsd *disk) 5118334Speter{ 5218334Speter struct fs *fs; 53117395Skan int sb, superblock; 5452284Sobrien 5590075Sobrien ERROR(disk, NULL); 5690075Sobrien 5750397Sobrien fs = &disk->d_fs; 58169689Skan superblock = superblocks[0]; 5990075Sobrien 6090075Sobrien for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 61117395Skan if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) { 62132718Skan ERROR(disk, "non-existent or truncated superblock"); 6318334Speter return (-1); 64169689Skan } 65169689Skan if (fs->fs_magic == FS_UFS1_MAGIC) 66169689Skan disk->d_ufs = 1; 67169689Skan if (fs->fs_magic == FS_UFS2_MAGIC && 68169689Skan fs->fs_sblockloc == superblock) 69169689Skan disk->d_ufs = 2; 70169689Skan if (fs->fs_bsize <= MAXBSIZE && 71169689Skan (size_t)fs->fs_bsize >= sizeof(*fs)) { 72169689Skan if (disk->d_ufs) 73169689Skan break; 74169689Skan } 75169689Skan disk->d_ufs = 0; 76169689Skan } 77169689Skan if (superblock == -1 || disk->d_ufs == 0) { 78169689Skan /* 79169689Skan * Other error cases will result in errno being set, here we 80169689Skan * must set it to indicate no superblock could be found with 81169689Skan * which to associate this disk/filesystem. 82169689Skan */ 83169689Skan ERROR(disk, "no usable known superblock found"); 84169689Skan errno = ENOENT; 85169689Skan return (-1); 86169689Skan } 87169689Skan disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1); 88169689Skan disk->d_sblock = superblock / disk->d_bsize; 89169689Skan return (0); 90132718Skan} 91132718Skan 92132718Skanint 93132718Skansbwrite(struct uufsd *disk, int all) 94132718Skan{ 95132718Skan struct fs *fs; 96132718Skan int i; 97132718Skan 98169689Skan ERROR(disk, NULL); 99169689Skan 100169689Skan fs = &disk->d_fs; 101169689Skan 102132718Skan if (!disk->d_sblock) { 103132718Skan disk->d_sblock = disk->d_fs.fs_sblockloc / disk->d_bsize; 104132718Skan } 105132718Skan 106132718Skan if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) { 107132718Skan ERROR(disk, "failed to write superblock"); 108132718Skan return (-1); 109132718Skan } 110132718Skan if (all) { 111132718Skan for (i = 0; i < fs->fs_ncg; i++) 112132718Skan if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)), 113132718Skan fs, SBLOCKSIZE) == -1) { 114132718Skan ERROR(disk, "failed to update a superblock"); 115132718Skan return (-1); 116132718Skan } 117169689Skan } 118169689Skan return (0); 119169689Skan} 120132718Skan