sblock.c revision 109766
11556Srgrimes/* 21556Srgrimes * Copyright (c) 2002 Juli Mallett. All rights reserved. 31556Srgrimes * 41556Srgrimes * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the 51556Srgrimes * FreeBSD project. Redistribution and use in source and binary forms, with 61556Srgrimes * or without modification, are permitted provided that the following 71556Srgrimes * conditions are met: 81556Srgrimes * 91556Srgrimes * 1. Redistribution of source code must retain the above copyright notice, 101556Srgrimes * this list of conditions and the following disclaimer. 111556Srgrimes * 2. Redistribution in binary form must reproduce the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer in the 131556Srgrimes * documentation and/or other materials provided with the distribution. 141556Srgrimes * 151556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 161556Srgrimes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 171556Srgrimes * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 181556Srgrimes * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 191556Srgrimes * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 201556Srgrimes * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 211556Srgrimes * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 221556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 231556Srgrimes * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 241556Srgrimes * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 251556Srgrimes * POSSIBILITY OF SUCH DAMAGE. 261556Srgrimes */ 271556Srgrimes 281556Srgrimes#include <sys/cdefs.h> 291556Srgrimes__FBSDID("$FreeBSD: head/lib/libufs/sblock.c 109766 2003-01-23 23:58:22Z jmallett $"); 301556Srgrimes 311556Srgrimes#include <sys/param.h> 321556Srgrimes#include <sys/mount.h> 331556Srgrimes#include <sys/disklabel.h> 341556Srgrimes#include <sys/stat.h> 3520413Ssteve 361556Srgrimes#include <ufs/ufs/ufsmount.h> 371556Srgrimes#include <ufs/ufs/dinode.h> 381556Srgrimes#include <ufs/ffs/fs.h> 391556Srgrimes 401556Srgrimes#include <errno.h> 4135773Scharnier#include <stdio.h> 4220413Ssteve#include <string.h> 4335773Scharnier#include <unistd.h> 4435773Scharnier 4535773Scharnier#include <libufs.h> 461556Srgrimes 471556Srgrimesstatic int superblocks[] = SBLOCKSEARCH; 481556Srgrimes 491556Srgrimesint 501556Srgrimessbread(struct uufsd *disk) 511556Srgrimes{ 521556Srgrimes struct fs *fs; 531556Srgrimes int sb, superblock; 541556Srgrimes 551556Srgrimes ERROR(disk, NULL); 5611738Sache 571556Srgrimes fs = &disk->d_fs; 581556Srgrimes superblock = superblocks[0]; 5927874Sbrian 601556Srgrimes for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 611556Srgrimes if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) { 621556Srgrimes ERROR(disk, "non-existent or truncated superblock"); 631556Srgrimes return -1; 6428037Sbrian } 651556Srgrimes if (fs->fs_magic == FS_UFS1_MAGIC) 661556Srgrimes disk->d_ufs = 1; 671556Srgrimes if ((fs->fs_magic == FS_UFS2_MAGIC) && 681556Srgrimes (fs->fs_sblockloc == superblock)) 691556Srgrimes disk->d_ufs = 2; 701556Srgrimes if ((fs->fs_bsize <= MAXBSIZE) && 711556Srgrimes (fs->fs_bsize >= sizeof(*fs))) { 721556Srgrimes if (disk->d_ufs) 731556Srgrimes break; 741556Srgrimes } 751556Srgrimes disk->d_ufs = 0; 761556Srgrimes } 771556Srgrimes if (superblock == -1 || disk->d_ufs == 0) { 7830073Sdanny /* 791556Srgrimes * Other error cases will result in errno being set, here we 8028037Sbrian * must set it to indicate no superblock could be found with 815233Sbde * which to associate this disk/filesystem. 8227874Sbrian */ 8327874Sbrian ERROR(disk, "no usable known superblock found"); 8427874Sbrian errno = ENOENT; 851556Srgrimes return -1; 8627874Sbrian } 8728037Sbrian disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1); 8811738Sache disk->d_sblock = superblock / disk->d_bsize; 891556Srgrimes return 0; 9030073Sdanny} 915233Sbde 9230073Sdannyint 931556Srgrimessbwrite(struct uufsd *disk, int all) 941556Srgrimes{ 955233Sbde struct fs *fs; 965233Sbde int i; 975233Sbde 985233Sbde ERROR(disk, NULL); 991556Srgrimes 10028037Sbrian fs = &disk->d_fs; 10128037Sbrian 10228037Sbrian if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) { 1031556Srgrimes ERROR(disk, "failed to write superblock"); 1041556Srgrimes return -1; 1051556Srgrimes } 1061556Srgrimes if (all) { 1071556Srgrimes for (i = 0; i < fs->fs_ncg; i++) 1081556Srgrimes if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)), 1091556Srgrimes fs, SBLOCKSIZE) == -1) { 1101556Srgrimes ERROR(disk, "failed to update a superblock"); 1111556Srgrimes return -1; 1125233Sbde } 1135233Sbde } 1145233Sbde return 0; 1155233Sbde} 1165233Sbde